12e405ad8SJosef Bacik // SPDX-License-Identifier: GPL-2.0 22e405ad8SJosef Bacik 32ca0ec77SJohannes Thumshirn #include <linux/list_sort.h> 4784352feSDavid Sterba #include "misc.h" 52e405ad8SJosef Bacik #include "ctree.h" 62e405ad8SJosef Bacik #include "block-group.h" 73eeb3226SJosef Bacik #include "space-info.h" 89f21246dSJosef Bacik #include "disk-io.h" 99f21246dSJosef Bacik #include "free-space-cache.h" 109f21246dSJosef Bacik #include "free-space-tree.h" 11e3e0520bSJosef Bacik #include "volumes.h" 12e3e0520bSJosef Bacik #include "transaction.h" 13e3e0520bSJosef Bacik #include "ref-verify.h" 144358d963SJosef Bacik #include "sysfs.h" 154358d963SJosef Bacik #include "tree-log.h" 1677745c05SJosef Bacik #include "delalloc-space.h" 17b0643e59SDennis Zhou #include "discard.h" 1896a14336SNikolay Borisov #include "raid56.h" 1908e11a3dSNaohiro Aota #include "zoned.h" 202e405ad8SJosef Bacik 21878d7b67SJosef Bacik /* 22878d7b67SJosef Bacik * Return target flags in extended format or 0 if restripe for this chunk_type 23878d7b67SJosef Bacik * is not in progress 24878d7b67SJosef Bacik * 25878d7b67SJosef Bacik * Should be called with balance_lock held 26878d7b67SJosef Bacik */ 27e11c0406SJosef Bacik static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) 28878d7b67SJosef Bacik { 29878d7b67SJosef Bacik struct btrfs_balance_control *bctl = fs_info->balance_ctl; 30878d7b67SJosef Bacik u64 target = 0; 31878d7b67SJosef Bacik 32878d7b67SJosef Bacik if (!bctl) 33878d7b67SJosef Bacik return 0; 34878d7b67SJosef Bacik 35878d7b67SJosef Bacik if (flags & BTRFS_BLOCK_GROUP_DATA && 36878d7b67SJosef Bacik bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) { 37878d7b67SJosef Bacik target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target; 38878d7b67SJosef Bacik } else if (flags & BTRFS_BLOCK_GROUP_SYSTEM && 39878d7b67SJosef Bacik bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) { 40878d7b67SJosef Bacik target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target; 41878d7b67SJosef Bacik } else if (flags & BTRFS_BLOCK_GROUP_METADATA && 42878d7b67SJosef Bacik bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) { 43878d7b67SJosef Bacik target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target; 44878d7b67SJosef Bacik } 45878d7b67SJosef Bacik 46878d7b67SJosef Bacik return target; 47878d7b67SJosef Bacik } 48878d7b67SJosef Bacik 49878d7b67SJosef Bacik /* 50878d7b67SJosef Bacik * @flags: available profiles in extended format (see ctree.h) 51878d7b67SJosef Bacik * 52878d7b67SJosef Bacik * Return reduced profile in chunk format. If profile changing is in progress 53878d7b67SJosef Bacik * (either running or paused) picks the target profile (if it's already 54878d7b67SJosef Bacik * available), otherwise falls back to plain reducing. 55878d7b67SJosef Bacik */ 56878d7b67SJosef Bacik static u64 btrfs_reduce_alloc_profile(struct btrfs_fs_info *fs_info, u64 flags) 57878d7b67SJosef Bacik { 58878d7b67SJosef Bacik u64 num_devices = fs_info->fs_devices->rw_devices; 59878d7b67SJosef Bacik u64 target; 60878d7b67SJosef Bacik u64 raid_type; 61878d7b67SJosef Bacik u64 allowed = 0; 62878d7b67SJosef Bacik 63878d7b67SJosef Bacik /* 64878d7b67SJosef Bacik * See if restripe for this chunk_type is in progress, if so try to 65878d7b67SJosef Bacik * reduce to the target profile 66878d7b67SJosef Bacik */ 67878d7b67SJosef Bacik spin_lock(&fs_info->balance_lock); 68e11c0406SJosef Bacik target = get_restripe_target(fs_info, flags); 69878d7b67SJosef Bacik if (target) { 70878d7b67SJosef Bacik spin_unlock(&fs_info->balance_lock); 71878d7b67SJosef Bacik return extended_to_chunk(target); 72878d7b67SJosef Bacik } 73878d7b67SJosef Bacik spin_unlock(&fs_info->balance_lock); 74878d7b67SJosef Bacik 75878d7b67SJosef Bacik /* First, mask out the RAID levels which aren't possible */ 76878d7b67SJosef Bacik for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) { 77878d7b67SJosef Bacik if (num_devices >= btrfs_raid_array[raid_type].devs_min) 78878d7b67SJosef Bacik allowed |= btrfs_raid_array[raid_type].bg_flag; 79878d7b67SJosef Bacik } 80878d7b67SJosef Bacik allowed &= flags; 81878d7b67SJosef Bacik 82878d7b67SJosef Bacik if (allowed & BTRFS_BLOCK_GROUP_RAID6) 83878d7b67SJosef Bacik allowed = BTRFS_BLOCK_GROUP_RAID6; 84878d7b67SJosef Bacik else if (allowed & BTRFS_BLOCK_GROUP_RAID5) 85878d7b67SJosef Bacik allowed = BTRFS_BLOCK_GROUP_RAID5; 86878d7b67SJosef Bacik else if (allowed & BTRFS_BLOCK_GROUP_RAID10) 87878d7b67SJosef Bacik allowed = BTRFS_BLOCK_GROUP_RAID10; 88878d7b67SJosef Bacik else if (allowed & BTRFS_BLOCK_GROUP_RAID1) 89878d7b67SJosef Bacik allowed = BTRFS_BLOCK_GROUP_RAID1; 90878d7b67SJosef Bacik else if (allowed & BTRFS_BLOCK_GROUP_RAID0) 91878d7b67SJosef Bacik allowed = BTRFS_BLOCK_GROUP_RAID0; 92878d7b67SJosef Bacik 93878d7b67SJosef Bacik flags &= ~BTRFS_BLOCK_GROUP_PROFILE_MASK; 94878d7b67SJosef Bacik 95878d7b67SJosef Bacik return extended_to_chunk(flags | allowed); 96878d7b67SJosef Bacik } 97878d7b67SJosef Bacik 98ef0a82daSJohannes Thumshirn u64 btrfs_get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags) 99878d7b67SJosef Bacik { 100878d7b67SJosef Bacik unsigned seq; 101878d7b67SJosef Bacik u64 flags; 102878d7b67SJosef Bacik 103878d7b67SJosef Bacik do { 104878d7b67SJosef Bacik flags = orig_flags; 105878d7b67SJosef Bacik seq = read_seqbegin(&fs_info->profiles_lock); 106878d7b67SJosef Bacik 107878d7b67SJosef Bacik if (flags & BTRFS_BLOCK_GROUP_DATA) 108878d7b67SJosef Bacik flags |= fs_info->avail_data_alloc_bits; 109878d7b67SJosef Bacik else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) 110878d7b67SJosef Bacik flags |= fs_info->avail_system_alloc_bits; 111878d7b67SJosef Bacik else if (flags & BTRFS_BLOCK_GROUP_METADATA) 112878d7b67SJosef Bacik flags |= fs_info->avail_metadata_alloc_bits; 113878d7b67SJosef Bacik } while (read_seqretry(&fs_info->profiles_lock, seq)); 114878d7b67SJosef Bacik 115878d7b67SJosef Bacik return btrfs_reduce_alloc_profile(fs_info, flags); 116878d7b67SJosef Bacik } 117878d7b67SJosef Bacik 11832da5386SDavid Sterba void btrfs_get_block_group(struct btrfs_block_group *cache) 1193cad1284SJosef Bacik { 12048aaeebeSJosef Bacik refcount_inc(&cache->refs); 1213cad1284SJosef Bacik } 1223cad1284SJosef Bacik 12332da5386SDavid Sterba void btrfs_put_block_group(struct btrfs_block_group *cache) 1243cad1284SJosef Bacik { 12548aaeebeSJosef Bacik if (refcount_dec_and_test(&cache->refs)) { 1263cad1284SJosef Bacik WARN_ON(cache->pinned > 0); 12740cdc509SFilipe Manana /* 12840cdc509SFilipe Manana * If there was a failure to cleanup a log tree, very likely due 12940cdc509SFilipe Manana * to an IO failure on a writeback attempt of one or more of its 13040cdc509SFilipe Manana * extent buffers, we could not do proper (and cheap) unaccounting 13140cdc509SFilipe Manana * of their reserved space, so don't warn on reserved > 0 in that 13240cdc509SFilipe Manana * case. 13340cdc509SFilipe Manana */ 13440cdc509SFilipe Manana if (!(cache->flags & BTRFS_BLOCK_GROUP_METADATA) || 13540cdc509SFilipe Manana !BTRFS_FS_LOG_CLEANUP_ERROR(cache->fs_info)) 1363cad1284SJosef Bacik WARN_ON(cache->reserved > 0); 1373cad1284SJosef Bacik 1383cad1284SJosef Bacik /* 139b0643e59SDennis Zhou * A block_group shouldn't be on the discard_list anymore. 140b0643e59SDennis Zhou * Remove the block_group from the discard_list to prevent us 141b0643e59SDennis Zhou * from causing a panic due to NULL pointer dereference. 142b0643e59SDennis Zhou */ 143b0643e59SDennis Zhou if (WARN_ON(!list_empty(&cache->discard_list))) 144b0643e59SDennis Zhou btrfs_discard_cancel_work(&cache->fs_info->discard_ctl, 145b0643e59SDennis Zhou cache); 146b0643e59SDennis Zhou 147b0643e59SDennis Zhou /* 1483cad1284SJosef Bacik * If not empty, someone is still holding mutex of 1493cad1284SJosef Bacik * full_stripe_lock, which can only be released by caller. 1503cad1284SJosef Bacik * And it will definitely cause use-after-free when caller 1513cad1284SJosef Bacik * tries to release full stripe lock. 1523cad1284SJosef Bacik * 1533cad1284SJosef Bacik * No better way to resolve, but only to warn. 1543cad1284SJosef Bacik */ 1553cad1284SJosef Bacik WARN_ON(!RB_EMPTY_ROOT(&cache->full_stripe_locks_root.root)); 1563cad1284SJosef Bacik kfree(cache->free_space_ctl); 157dafc340dSNaohiro Aota kfree(cache->physical_map); 1583cad1284SJosef Bacik kfree(cache); 1593cad1284SJosef Bacik } 1603cad1284SJosef Bacik } 1613cad1284SJosef Bacik 1622e405ad8SJosef Bacik /* 1634358d963SJosef Bacik * This adds the block group to the fs_info rb tree for the block group cache 1644358d963SJosef Bacik */ 1654358d963SJosef Bacik static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, 16632da5386SDavid Sterba struct btrfs_block_group *block_group) 1674358d963SJosef Bacik { 1684358d963SJosef Bacik struct rb_node **p; 1694358d963SJosef Bacik struct rb_node *parent = NULL; 17032da5386SDavid Sterba struct btrfs_block_group *cache; 17108dddb29SFilipe Manana bool leftmost = true; 1724358d963SJosef Bacik 1739afc6649SQu Wenruo ASSERT(block_group->length != 0); 1749afc6649SQu Wenruo 17516b0c258SFilipe Manana write_lock(&info->block_group_cache_lock); 17608dddb29SFilipe Manana p = &info->block_group_cache_tree.rb_root.rb_node; 1774358d963SJosef Bacik 1784358d963SJosef Bacik while (*p) { 1794358d963SJosef Bacik parent = *p; 18032da5386SDavid Sterba cache = rb_entry(parent, struct btrfs_block_group, cache_node); 181b3470b5dSDavid Sterba if (block_group->start < cache->start) { 1824358d963SJosef Bacik p = &(*p)->rb_left; 183b3470b5dSDavid Sterba } else if (block_group->start > cache->start) { 1844358d963SJosef Bacik p = &(*p)->rb_right; 18508dddb29SFilipe Manana leftmost = false; 1864358d963SJosef Bacik } else { 18716b0c258SFilipe Manana write_unlock(&info->block_group_cache_lock); 1884358d963SJosef Bacik return -EEXIST; 1894358d963SJosef Bacik } 1904358d963SJosef Bacik } 1914358d963SJosef Bacik 1924358d963SJosef Bacik rb_link_node(&block_group->cache_node, parent, p); 19308dddb29SFilipe Manana rb_insert_color_cached(&block_group->cache_node, 19408dddb29SFilipe Manana &info->block_group_cache_tree, leftmost); 1954358d963SJosef Bacik 19616b0c258SFilipe Manana write_unlock(&info->block_group_cache_lock); 1974358d963SJosef Bacik 1984358d963SJosef Bacik return 0; 1994358d963SJosef Bacik } 2004358d963SJosef Bacik 2014358d963SJosef Bacik /* 2022e405ad8SJosef Bacik * This will return the block group at or after bytenr if contains is 0, else 2032e405ad8SJosef Bacik * it will return the block group that contains the bytenr 2042e405ad8SJosef Bacik */ 20532da5386SDavid Sterba static struct btrfs_block_group *block_group_cache_tree_search( 2062e405ad8SJosef Bacik struct btrfs_fs_info *info, u64 bytenr, int contains) 2072e405ad8SJosef Bacik { 20832da5386SDavid Sterba struct btrfs_block_group *cache, *ret = NULL; 2092e405ad8SJosef Bacik struct rb_node *n; 2102e405ad8SJosef Bacik u64 end, start; 2112e405ad8SJosef Bacik 21216b0c258SFilipe Manana read_lock(&info->block_group_cache_lock); 21308dddb29SFilipe Manana n = info->block_group_cache_tree.rb_root.rb_node; 2142e405ad8SJosef Bacik 2152e405ad8SJosef Bacik while (n) { 21632da5386SDavid Sterba cache = rb_entry(n, struct btrfs_block_group, cache_node); 217b3470b5dSDavid Sterba end = cache->start + cache->length - 1; 218b3470b5dSDavid Sterba start = cache->start; 2192e405ad8SJosef Bacik 2202e405ad8SJosef Bacik if (bytenr < start) { 221b3470b5dSDavid Sterba if (!contains && (!ret || start < ret->start)) 2222e405ad8SJosef Bacik ret = cache; 2232e405ad8SJosef Bacik n = n->rb_left; 2242e405ad8SJosef Bacik } else if (bytenr > start) { 2252e405ad8SJosef Bacik if (contains && bytenr <= end) { 2262e405ad8SJosef Bacik ret = cache; 2272e405ad8SJosef Bacik break; 2282e405ad8SJosef Bacik } 2292e405ad8SJosef Bacik n = n->rb_right; 2302e405ad8SJosef Bacik } else { 2312e405ad8SJosef Bacik ret = cache; 2322e405ad8SJosef Bacik break; 2332e405ad8SJosef Bacik } 2342e405ad8SJosef Bacik } 23508dddb29SFilipe Manana if (ret) 2362e405ad8SJosef Bacik btrfs_get_block_group(ret); 23716b0c258SFilipe Manana read_unlock(&info->block_group_cache_lock); 2382e405ad8SJosef Bacik 2392e405ad8SJosef Bacik return ret; 2402e405ad8SJosef Bacik } 2412e405ad8SJosef Bacik 2422e405ad8SJosef Bacik /* 2432e405ad8SJosef Bacik * Return the block group that starts at or after bytenr 2442e405ad8SJosef Bacik */ 24532da5386SDavid Sterba struct btrfs_block_group *btrfs_lookup_first_block_group( 2462e405ad8SJosef Bacik struct btrfs_fs_info *info, u64 bytenr) 2472e405ad8SJosef Bacik { 2482e405ad8SJosef Bacik return block_group_cache_tree_search(info, bytenr, 0); 2492e405ad8SJosef Bacik } 2502e405ad8SJosef Bacik 2512e405ad8SJosef Bacik /* 2522e405ad8SJosef Bacik * Return the block group that contains the given bytenr 2532e405ad8SJosef Bacik */ 25432da5386SDavid Sterba struct btrfs_block_group *btrfs_lookup_block_group( 2552e405ad8SJosef Bacik struct btrfs_fs_info *info, u64 bytenr) 2562e405ad8SJosef Bacik { 2572e405ad8SJosef Bacik return block_group_cache_tree_search(info, bytenr, 1); 2582e405ad8SJosef Bacik } 2592e405ad8SJosef Bacik 26032da5386SDavid Sterba struct btrfs_block_group *btrfs_next_block_group( 26132da5386SDavid Sterba struct btrfs_block_group *cache) 2622e405ad8SJosef Bacik { 2632e405ad8SJosef Bacik struct btrfs_fs_info *fs_info = cache->fs_info; 2642e405ad8SJosef Bacik struct rb_node *node; 2652e405ad8SJosef Bacik 26616b0c258SFilipe Manana read_lock(&fs_info->block_group_cache_lock); 2672e405ad8SJosef Bacik 2682e405ad8SJosef Bacik /* If our block group was removed, we need a full search. */ 2692e405ad8SJosef Bacik if (RB_EMPTY_NODE(&cache->cache_node)) { 270b3470b5dSDavid Sterba const u64 next_bytenr = cache->start + cache->length; 2712e405ad8SJosef Bacik 27216b0c258SFilipe Manana read_unlock(&fs_info->block_group_cache_lock); 2732e405ad8SJosef Bacik btrfs_put_block_group(cache); 2748b01f931SFilipe Manana return btrfs_lookup_first_block_group(fs_info, next_bytenr); 2752e405ad8SJosef Bacik } 2762e405ad8SJosef Bacik node = rb_next(&cache->cache_node); 2772e405ad8SJosef Bacik btrfs_put_block_group(cache); 2782e405ad8SJosef Bacik if (node) { 27932da5386SDavid Sterba cache = rb_entry(node, struct btrfs_block_group, cache_node); 2802e405ad8SJosef Bacik btrfs_get_block_group(cache); 2812e405ad8SJosef Bacik } else 2822e405ad8SJosef Bacik cache = NULL; 28316b0c258SFilipe Manana read_unlock(&fs_info->block_group_cache_lock); 2842e405ad8SJosef Bacik return cache; 2852e405ad8SJosef Bacik } 2863eeb3226SJosef Bacik 287*2306e83eSFilipe Manana /** 288*2306e83eSFilipe Manana * Check if we can do a NOCOW write for a given extent. 289*2306e83eSFilipe Manana * 290*2306e83eSFilipe Manana * @fs_info: The filesystem information object. 291*2306e83eSFilipe Manana * @bytenr: Logical start address of the extent. 292*2306e83eSFilipe Manana * 293*2306e83eSFilipe Manana * Check if we can do a NOCOW write for the given extent, and increments the 294*2306e83eSFilipe Manana * number of NOCOW writers in the block group that contains the extent, as long 295*2306e83eSFilipe Manana * as the block group exists and it's currently not in read-only mode. 296*2306e83eSFilipe Manana * 297*2306e83eSFilipe Manana * Returns: A non-NULL block group pointer if we can do a NOCOW write, the caller 298*2306e83eSFilipe Manana * is responsible for calling btrfs_dec_nocow_writers() later. 299*2306e83eSFilipe Manana * 300*2306e83eSFilipe Manana * Or NULL if we can not do a NOCOW write 301*2306e83eSFilipe Manana */ 302*2306e83eSFilipe Manana struct btrfs_block_group *btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, 303*2306e83eSFilipe Manana u64 bytenr) 3043eeb3226SJosef Bacik { 30532da5386SDavid Sterba struct btrfs_block_group *bg; 306*2306e83eSFilipe Manana bool can_nocow = true; 3073eeb3226SJosef Bacik 3083eeb3226SJosef Bacik bg = btrfs_lookup_block_group(fs_info, bytenr); 3093eeb3226SJosef Bacik if (!bg) 310*2306e83eSFilipe Manana return NULL; 3113eeb3226SJosef Bacik 3123eeb3226SJosef Bacik spin_lock(&bg->lock); 3133eeb3226SJosef Bacik if (bg->ro) 314*2306e83eSFilipe Manana can_nocow = false; 3153eeb3226SJosef Bacik else 3163eeb3226SJosef Bacik atomic_inc(&bg->nocow_writers); 3173eeb3226SJosef Bacik spin_unlock(&bg->lock); 3183eeb3226SJosef Bacik 319*2306e83eSFilipe Manana if (!can_nocow) { 3203eeb3226SJosef Bacik btrfs_put_block_group(bg); 321*2306e83eSFilipe Manana return NULL; 3223eeb3226SJosef Bacik } 3233eeb3226SJosef Bacik 324*2306e83eSFilipe Manana /* No put on block group, done by btrfs_dec_nocow_writers(). */ 325*2306e83eSFilipe Manana return bg; 326*2306e83eSFilipe Manana } 3273eeb3226SJosef Bacik 328*2306e83eSFilipe Manana /** 329*2306e83eSFilipe Manana * Decrement the number of NOCOW writers in a block group. 330*2306e83eSFilipe Manana * 331*2306e83eSFilipe Manana * @bg: The block group. 332*2306e83eSFilipe Manana * 333*2306e83eSFilipe Manana * This is meant to be called after a previous call to btrfs_inc_nocow_writers(), 334*2306e83eSFilipe Manana * and on the block group returned by that call. Typically this is called after 335*2306e83eSFilipe Manana * creating an ordered extent for a NOCOW write, to prevent races with scrub and 336*2306e83eSFilipe Manana * relocation. 337*2306e83eSFilipe Manana * 338*2306e83eSFilipe Manana * After this call, the caller should not use the block group anymore. It it wants 339*2306e83eSFilipe Manana * to use it, then it should get a reference on it before calling this function. 340*2306e83eSFilipe Manana */ 341*2306e83eSFilipe Manana void btrfs_dec_nocow_writers(struct btrfs_block_group *bg) 342*2306e83eSFilipe Manana { 3433eeb3226SJosef Bacik if (atomic_dec_and_test(&bg->nocow_writers)) 3443eeb3226SJosef Bacik wake_up_var(&bg->nocow_writers); 345*2306e83eSFilipe Manana 346*2306e83eSFilipe Manana /* For the lookup done by a previous call to btrfs_inc_nocow_writers(). */ 3473eeb3226SJosef Bacik btrfs_put_block_group(bg); 3483eeb3226SJosef Bacik } 3493eeb3226SJosef Bacik 35032da5386SDavid Sterba void btrfs_wait_nocow_writers(struct btrfs_block_group *bg) 3513eeb3226SJosef Bacik { 3523eeb3226SJosef Bacik wait_var_event(&bg->nocow_writers, !atomic_read(&bg->nocow_writers)); 3533eeb3226SJosef Bacik } 3543eeb3226SJosef Bacik 3553eeb3226SJosef Bacik void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, 3563eeb3226SJosef Bacik const u64 start) 3573eeb3226SJosef Bacik { 35832da5386SDavid Sterba struct btrfs_block_group *bg; 3593eeb3226SJosef Bacik 3603eeb3226SJosef Bacik bg = btrfs_lookup_block_group(fs_info, start); 3613eeb3226SJosef Bacik ASSERT(bg); 3623eeb3226SJosef Bacik if (atomic_dec_and_test(&bg->reservations)) 3633eeb3226SJosef Bacik wake_up_var(&bg->reservations); 3643eeb3226SJosef Bacik btrfs_put_block_group(bg); 3653eeb3226SJosef Bacik } 3663eeb3226SJosef Bacik 36732da5386SDavid Sterba void btrfs_wait_block_group_reservations(struct btrfs_block_group *bg) 3683eeb3226SJosef Bacik { 3693eeb3226SJosef Bacik struct btrfs_space_info *space_info = bg->space_info; 3703eeb3226SJosef Bacik 3713eeb3226SJosef Bacik ASSERT(bg->ro); 3723eeb3226SJosef Bacik 3733eeb3226SJosef Bacik if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA)) 3743eeb3226SJosef Bacik return; 3753eeb3226SJosef Bacik 3763eeb3226SJosef Bacik /* 3773eeb3226SJosef Bacik * Our block group is read only but before we set it to read only, 3783eeb3226SJosef Bacik * some task might have had allocated an extent from it already, but it 3793eeb3226SJosef Bacik * has not yet created a respective ordered extent (and added it to a 3803eeb3226SJosef Bacik * root's list of ordered extents). 3813eeb3226SJosef Bacik * Therefore wait for any task currently allocating extents, since the 3823eeb3226SJosef Bacik * block group's reservations counter is incremented while a read lock 3833eeb3226SJosef Bacik * on the groups' semaphore is held and decremented after releasing 3843eeb3226SJosef Bacik * the read access on that semaphore and creating the ordered extent. 3853eeb3226SJosef Bacik */ 3863eeb3226SJosef Bacik down_write(&space_info->groups_sem); 3873eeb3226SJosef Bacik up_write(&space_info->groups_sem); 3883eeb3226SJosef Bacik 3893eeb3226SJosef Bacik wait_var_event(&bg->reservations, !atomic_read(&bg->reservations)); 3903eeb3226SJosef Bacik } 3919f21246dSJosef Bacik 3929f21246dSJosef Bacik struct btrfs_caching_control *btrfs_get_caching_control( 39332da5386SDavid Sterba struct btrfs_block_group *cache) 3949f21246dSJosef Bacik { 3959f21246dSJosef Bacik struct btrfs_caching_control *ctl; 3969f21246dSJosef Bacik 3979f21246dSJosef Bacik spin_lock(&cache->lock); 3989f21246dSJosef Bacik if (!cache->caching_ctl) { 3999f21246dSJosef Bacik spin_unlock(&cache->lock); 4009f21246dSJosef Bacik return NULL; 4019f21246dSJosef Bacik } 4029f21246dSJosef Bacik 4039f21246dSJosef Bacik ctl = cache->caching_ctl; 4049f21246dSJosef Bacik refcount_inc(&ctl->count); 4059f21246dSJosef Bacik spin_unlock(&cache->lock); 4069f21246dSJosef Bacik return ctl; 4079f21246dSJosef Bacik } 4089f21246dSJosef Bacik 4099f21246dSJosef Bacik void btrfs_put_caching_control(struct btrfs_caching_control *ctl) 4109f21246dSJosef Bacik { 4119f21246dSJosef Bacik if (refcount_dec_and_test(&ctl->count)) 4129f21246dSJosef Bacik kfree(ctl); 4139f21246dSJosef Bacik } 4149f21246dSJosef Bacik 4159f21246dSJosef Bacik /* 4169f21246dSJosef Bacik * When we wait for progress in the block group caching, its because our 4179f21246dSJosef Bacik * allocation attempt failed at least once. So, we must sleep and let some 4189f21246dSJosef Bacik * progress happen before we try again. 4199f21246dSJosef Bacik * 4209f21246dSJosef Bacik * This function will sleep at least once waiting for new free space to show 4219f21246dSJosef Bacik * up, and then it will check the block group free space numbers for our min 4229f21246dSJosef Bacik * num_bytes. Another option is to have it go ahead and look in the rbtree for 4239f21246dSJosef Bacik * a free extent of a given size, but this is a good start. 4249f21246dSJosef Bacik * 4259f21246dSJosef Bacik * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using 4269f21246dSJosef Bacik * any of the information in this block group. 4279f21246dSJosef Bacik */ 42832da5386SDavid Sterba void btrfs_wait_block_group_cache_progress(struct btrfs_block_group *cache, 4299f21246dSJosef Bacik u64 num_bytes) 4309f21246dSJosef Bacik { 4319f21246dSJosef Bacik struct btrfs_caching_control *caching_ctl; 4329f21246dSJosef Bacik 4339f21246dSJosef Bacik caching_ctl = btrfs_get_caching_control(cache); 4349f21246dSJosef Bacik if (!caching_ctl) 4359f21246dSJosef Bacik return; 4369f21246dSJosef Bacik 43732da5386SDavid Sterba wait_event(caching_ctl->wait, btrfs_block_group_done(cache) || 4389f21246dSJosef Bacik (cache->free_space_ctl->free_space >= num_bytes)); 4399f21246dSJosef Bacik 4409f21246dSJosef Bacik btrfs_put_caching_control(caching_ctl); 4419f21246dSJosef Bacik } 4429f21246dSJosef Bacik 44332da5386SDavid Sterba int btrfs_wait_block_group_cache_done(struct btrfs_block_group *cache) 4449f21246dSJosef Bacik { 4459f21246dSJosef Bacik struct btrfs_caching_control *caching_ctl; 4469f21246dSJosef Bacik int ret = 0; 4479f21246dSJosef Bacik 4489f21246dSJosef Bacik caching_ctl = btrfs_get_caching_control(cache); 4499f21246dSJosef Bacik if (!caching_ctl) 4509f21246dSJosef Bacik return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0; 4519f21246dSJosef Bacik 45232da5386SDavid Sterba wait_event(caching_ctl->wait, btrfs_block_group_done(cache)); 4539f21246dSJosef Bacik if (cache->cached == BTRFS_CACHE_ERROR) 4549f21246dSJosef Bacik ret = -EIO; 4559f21246dSJosef Bacik btrfs_put_caching_control(caching_ctl); 4569f21246dSJosef Bacik return ret; 4579f21246dSJosef Bacik } 4589f21246dSJosef Bacik 459e747853cSJosef Bacik static bool space_cache_v1_done(struct btrfs_block_group *cache) 460e747853cSJosef Bacik { 461e747853cSJosef Bacik bool ret; 462e747853cSJosef Bacik 463e747853cSJosef Bacik spin_lock(&cache->lock); 464e747853cSJosef Bacik ret = cache->cached != BTRFS_CACHE_FAST; 465e747853cSJosef Bacik spin_unlock(&cache->lock); 466e747853cSJosef Bacik 467e747853cSJosef Bacik return ret; 468e747853cSJosef Bacik } 469e747853cSJosef Bacik 470e747853cSJosef Bacik void btrfs_wait_space_cache_v1_finished(struct btrfs_block_group *cache, 471e747853cSJosef Bacik struct btrfs_caching_control *caching_ctl) 472e747853cSJosef Bacik { 473e747853cSJosef Bacik wait_event(caching_ctl->wait, space_cache_v1_done(cache)); 474e747853cSJosef Bacik } 475e747853cSJosef Bacik 4769f21246dSJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 47732da5386SDavid Sterba static void fragment_free_space(struct btrfs_block_group *block_group) 4789f21246dSJosef Bacik { 4799f21246dSJosef Bacik struct btrfs_fs_info *fs_info = block_group->fs_info; 480b3470b5dSDavid Sterba u64 start = block_group->start; 481b3470b5dSDavid Sterba u64 len = block_group->length; 4829f21246dSJosef Bacik u64 chunk = block_group->flags & BTRFS_BLOCK_GROUP_METADATA ? 4839f21246dSJosef Bacik fs_info->nodesize : fs_info->sectorsize; 4849f21246dSJosef Bacik u64 step = chunk << 1; 4859f21246dSJosef Bacik 4869f21246dSJosef Bacik while (len > chunk) { 4879f21246dSJosef Bacik btrfs_remove_free_space(block_group, start, chunk); 4889f21246dSJosef Bacik start += step; 4899f21246dSJosef Bacik if (len < step) 4909f21246dSJosef Bacik len = 0; 4919f21246dSJosef Bacik else 4929f21246dSJosef Bacik len -= step; 4939f21246dSJosef Bacik } 4949f21246dSJosef Bacik } 4959f21246dSJosef Bacik #endif 4969f21246dSJosef Bacik 4979f21246dSJosef Bacik /* 4989f21246dSJosef Bacik * This is only called by btrfs_cache_block_group, since we could have freed 4999f21246dSJosef Bacik * extents we need to check the pinned_extents for any extents that can't be 5009f21246dSJosef Bacik * used yet since their free space will be released as soon as the transaction 5019f21246dSJosef Bacik * commits. 5029f21246dSJosef Bacik */ 50332da5386SDavid Sterba u64 add_new_free_space(struct btrfs_block_group *block_group, u64 start, u64 end) 5049f21246dSJosef Bacik { 5059f21246dSJosef Bacik struct btrfs_fs_info *info = block_group->fs_info; 5069f21246dSJosef Bacik u64 extent_start, extent_end, size, total_added = 0; 5079f21246dSJosef Bacik int ret; 5089f21246dSJosef Bacik 5099f21246dSJosef Bacik while (start < end) { 510fe119a6eSNikolay Borisov ret = find_first_extent_bit(&info->excluded_extents, start, 5119f21246dSJosef Bacik &extent_start, &extent_end, 5129f21246dSJosef Bacik EXTENT_DIRTY | EXTENT_UPTODATE, 5139f21246dSJosef Bacik NULL); 5149f21246dSJosef Bacik if (ret) 5159f21246dSJosef Bacik break; 5169f21246dSJosef Bacik 5179f21246dSJosef Bacik if (extent_start <= start) { 5189f21246dSJosef Bacik start = extent_end + 1; 5199f21246dSJosef Bacik } else if (extent_start > start && extent_start < end) { 5209f21246dSJosef Bacik size = extent_start - start; 5219f21246dSJosef Bacik total_added += size; 522b0643e59SDennis Zhou ret = btrfs_add_free_space_async_trimmed(block_group, 523b0643e59SDennis Zhou start, size); 5249f21246dSJosef Bacik BUG_ON(ret); /* -ENOMEM or logic error */ 5259f21246dSJosef Bacik start = extent_end + 1; 5269f21246dSJosef Bacik } else { 5279f21246dSJosef Bacik break; 5289f21246dSJosef Bacik } 5299f21246dSJosef Bacik } 5309f21246dSJosef Bacik 5319f21246dSJosef Bacik if (start < end) { 5329f21246dSJosef Bacik size = end - start; 5339f21246dSJosef Bacik total_added += size; 534b0643e59SDennis Zhou ret = btrfs_add_free_space_async_trimmed(block_group, start, 535b0643e59SDennis Zhou size); 5369f21246dSJosef Bacik BUG_ON(ret); /* -ENOMEM or logic error */ 5379f21246dSJosef Bacik } 5389f21246dSJosef Bacik 5399f21246dSJosef Bacik return total_added; 5409f21246dSJosef Bacik } 5419f21246dSJosef Bacik 5429f21246dSJosef Bacik static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl) 5439f21246dSJosef Bacik { 54432da5386SDavid Sterba struct btrfs_block_group *block_group = caching_ctl->block_group; 5459f21246dSJosef Bacik struct btrfs_fs_info *fs_info = block_group->fs_info; 54629cbcf40SJosef Bacik struct btrfs_root *extent_root; 5479f21246dSJosef Bacik struct btrfs_path *path; 5489f21246dSJosef Bacik struct extent_buffer *leaf; 5499f21246dSJosef Bacik struct btrfs_key key; 5509f21246dSJosef Bacik u64 total_found = 0; 5519f21246dSJosef Bacik u64 last = 0; 5529f21246dSJosef Bacik u32 nritems; 5539f21246dSJosef Bacik int ret; 5549f21246dSJosef Bacik bool wakeup = true; 5559f21246dSJosef Bacik 5569f21246dSJosef Bacik path = btrfs_alloc_path(); 5579f21246dSJosef Bacik if (!path) 5589f21246dSJosef Bacik return -ENOMEM; 5599f21246dSJosef Bacik 560b3470b5dSDavid Sterba last = max_t(u64, block_group->start, BTRFS_SUPER_INFO_OFFSET); 56129cbcf40SJosef Bacik extent_root = btrfs_extent_root(fs_info, last); 5629f21246dSJosef Bacik 5639f21246dSJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 5649f21246dSJosef Bacik /* 5659f21246dSJosef Bacik * If we're fragmenting we don't want to make anybody think we can 5669f21246dSJosef Bacik * allocate from this block group until we've had a chance to fragment 5679f21246dSJosef Bacik * the free space. 5689f21246dSJosef Bacik */ 5699f21246dSJosef Bacik if (btrfs_should_fragment_free_space(block_group)) 5709f21246dSJosef Bacik wakeup = false; 5719f21246dSJosef Bacik #endif 5729f21246dSJosef Bacik /* 5739f21246dSJosef Bacik * We don't want to deadlock with somebody trying to allocate a new 5749f21246dSJosef Bacik * extent for the extent root while also trying to search the extent 5759f21246dSJosef Bacik * root to add free space. So we skip locking and search the commit 5769f21246dSJosef Bacik * root, since its read-only 5779f21246dSJosef Bacik */ 5789f21246dSJosef Bacik path->skip_locking = 1; 5799f21246dSJosef Bacik path->search_commit_root = 1; 5809f21246dSJosef Bacik path->reada = READA_FORWARD; 5819f21246dSJosef Bacik 5829f21246dSJosef Bacik key.objectid = last; 5839f21246dSJosef Bacik key.offset = 0; 5849f21246dSJosef Bacik key.type = BTRFS_EXTENT_ITEM_KEY; 5859f21246dSJosef Bacik 5869f21246dSJosef Bacik next: 5879f21246dSJosef Bacik ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); 5889f21246dSJosef Bacik if (ret < 0) 5899f21246dSJosef Bacik goto out; 5909f21246dSJosef Bacik 5919f21246dSJosef Bacik leaf = path->nodes[0]; 5929f21246dSJosef Bacik nritems = btrfs_header_nritems(leaf); 5939f21246dSJosef Bacik 5949f21246dSJosef Bacik while (1) { 5959f21246dSJosef Bacik if (btrfs_fs_closing(fs_info) > 1) { 5969f21246dSJosef Bacik last = (u64)-1; 5979f21246dSJosef Bacik break; 5989f21246dSJosef Bacik } 5999f21246dSJosef Bacik 6009f21246dSJosef Bacik if (path->slots[0] < nritems) { 6019f21246dSJosef Bacik btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); 6029f21246dSJosef Bacik } else { 6039f21246dSJosef Bacik ret = btrfs_find_next_key(extent_root, path, &key, 0, 0); 6049f21246dSJosef Bacik if (ret) 6059f21246dSJosef Bacik break; 6069f21246dSJosef Bacik 6079f21246dSJosef Bacik if (need_resched() || 6089f21246dSJosef Bacik rwsem_is_contended(&fs_info->commit_root_sem)) { 6099f21246dSJosef Bacik if (wakeup) 6109f21246dSJosef Bacik caching_ctl->progress = last; 6119f21246dSJosef Bacik btrfs_release_path(path); 6129f21246dSJosef Bacik up_read(&fs_info->commit_root_sem); 6139f21246dSJosef Bacik mutex_unlock(&caching_ctl->mutex); 6149f21246dSJosef Bacik cond_resched(); 6159f21246dSJosef Bacik mutex_lock(&caching_ctl->mutex); 6169f21246dSJosef Bacik down_read(&fs_info->commit_root_sem); 6179f21246dSJosef Bacik goto next; 6189f21246dSJosef Bacik } 6199f21246dSJosef Bacik 6209f21246dSJosef Bacik ret = btrfs_next_leaf(extent_root, path); 6219f21246dSJosef Bacik if (ret < 0) 6229f21246dSJosef Bacik goto out; 6239f21246dSJosef Bacik if (ret) 6249f21246dSJosef Bacik break; 6259f21246dSJosef Bacik leaf = path->nodes[0]; 6269f21246dSJosef Bacik nritems = btrfs_header_nritems(leaf); 6279f21246dSJosef Bacik continue; 6289f21246dSJosef Bacik } 6299f21246dSJosef Bacik 6309f21246dSJosef Bacik if (key.objectid < last) { 6319f21246dSJosef Bacik key.objectid = last; 6329f21246dSJosef Bacik key.offset = 0; 6339f21246dSJosef Bacik key.type = BTRFS_EXTENT_ITEM_KEY; 6349f21246dSJosef Bacik 6359f21246dSJosef Bacik if (wakeup) 6369f21246dSJosef Bacik caching_ctl->progress = last; 6379f21246dSJosef Bacik btrfs_release_path(path); 6389f21246dSJosef Bacik goto next; 6399f21246dSJosef Bacik } 6409f21246dSJosef Bacik 641b3470b5dSDavid Sterba if (key.objectid < block_group->start) { 6429f21246dSJosef Bacik path->slots[0]++; 6439f21246dSJosef Bacik continue; 6449f21246dSJosef Bacik } 6459f21246dSJosef Bacik 646b3470b5dSDavid Sterba if (key.objectid >= block_group->start + block_group->length) 6479f21246dSJosef Bacik break; 6489f21246dSJosef Bacik 6499f21246dSJosef Bacik if (key.type == BTRFS_EXTENT_ITEM_KEY || 6509f21246dSJosef Bacik key.type == BTRFS_METADATA_ITEM_KEY) { 6519f21246dSJosef Bacik total_found += add_new_free_space(block_group, last, 6529f21246dSJosef Bacik key.objectid); 6539f21246dSJosef Bacik if (key.type == BTRFS_METADATA_ITEM_KEY) 6549f21246dSJosef Bacik last = key.objectid + 6559f21246dSJosef Bacik fs_info->nodesize; 6569f21246dSJosef Bacik else 6579f21246dSJosef Bacik last = key.objectid + key.offset; 6589f21246dSJosef Bacik 6599f21246dSJosef Bacik if (total_found > CACHING_CTL_WAKE_UP) { 6609f21246dSJosef Bacik total_found = 0; 6619f21246dSJosef Bacik if (wakeup) 6629f21246dSJosef Bacik wake_up(&caching_ctl->wait); 6639f21246dSJosef Bacik } 6649f21246dSJosef Bacik } 6659f21246dSJosef Bacik path->slots[0]++; 6669f21246dSJosef Bacik } 6679f21246dSJosef Bacik ret = 0; 6689f21246dSJosef Bacik 6699f21246dSJosef Bacik total_found += add_new_free_space(block_group, last, 670b3470b5dSDavid Sterba block_group->start + block_group->length); 6719f21246dSJosef Bacik caching_ctl->progress = (u64)-1; 6729f21246dSJosef Bacik 6739f21246dSJosef Bacik out: 6749f21246dSJosef Bacik btrfs_free_path(path); 6759f21246dSJosef Bacik return ret; 6769f21246dSJosef Bacik } 6779f21246dSJosef Bacik 6789f21246dSJosef Bacik static noinline void caching_thread(struct btrfs_work *work) 6799f21246dSJosef Bacik { 68032da5386SDavid Sterba struct btrfs_block_group *block_group; 6819f21246dSJosef Bacik struct btrfs_fs_info *fs_info; 6829f21246dSJosef Bacik struct btrfs_caching_control *caching_ctl; 6839f21246dSJosef Bacik int ret; 6849f21246dSJosef Bacik 6859f21246dSJosef Bacik caching_ctl = container_of(work, struct btrfs_caching_control, work); 6869f21246dSJosef Bacik block_group = caching_ctl->block_group; 6879f21246dSJosef Bacik fs_info = block_group->fs_info; 6889f21246dSJosef Bacik 6899f21246dSJosef Bacik mutex_lock(&caching_ctl->mutex); 6909f21246dSJosef Bacik down_read(&fs_info->commit_root_sem); 6919f21246dSJosef Bacik 692e747853cSJosef Bacik if (btrfs_test_opt(fs_info, SPACE_CACHE)) { 693e747853cSJosef Bacik ret = load_free_space_cache(block_group); 694e747853cSJosef Bacik if (ret == 1) { 695e747853cSJosef Bacik ret = 0; 696e747853cSJosef Bacik goto done; 697e747853cSJosef Bacik } 698e747853cSJosef Bacik 699e747853cSJosef Bacik /* 700e747853cSJosef Bacik * We failed to load the space cache, set ourselves to 701e747853cSJosef Bacik * CACHE_STARTED and carry on. 702e747853cSJosef Bacik */ 703e747853cSJosef Bacik spin_lock(&block_group->lock); 704e747853cSJosef Bacik block_group->cached = BTRFS_CACHE_STARTED; 705e747853cSJosef Bacik spin_unlock(&block_group->lock); 706e747853cSJosef Bacik wake_up(&caching_ctl->wait); 707e747853cSJosef Bacik } 708e747853cSJosef Bacik 7092f96e402SJosef Bacik /* 7102f96e402SJosef Bacik * If we are in the transaction that populated the free space tree we 7112f96e402SJosef Bacik * can't actually cache from the free space tree as our commit root and 7122f96e402SJosef Bacik * real root are the same, so we could change the contents of the blocks 7132f96e402SJosef Bacik * while caching. Instead do the slow caching in this case, and after 7142f96e402SJosef Bacik * the transaction has committed we will be safe. 7152f96e402SJosef Bacik */ 7162f96e402SJosef Bacik if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && 7172f96e402SJosef Bacik !(test_bit(BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED, &fs_info->flags))) 7189f21246dSJosef Bacik ret = load_free_space_tree(caching_ctl); 7199f21246dSJosef Bacik else 7209f21246dSJosef Bacik ret = load_extent_tree_free(caching_ctl); 721e747853cSJosef Bacik done: 7229f21246dSJosef Bacik spin_lock(&block_group->lock); 7239f21246dSJosef Bacik block_group->caching_ctl = NULL; 7249f21246dSJosef Bacik block_group->cached = ret ? BTRFS_CACHE_ERROR : BTRFS_CACHE_FINISHED; 7259f21246dSJosef Bacik spin_unlock(&block_group->lock); 7269f21246dSJosef Bacik 7279f21246dSJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 7289f21246dSJosef Bacik if (btrfs_should_fragment_free_space(block_group)) { 7299f21246dSJosef Bacik u64 bytes_used; 7309f21246dSJosef Bacik 7319f21246dSJosef Bacik spin_lock(&block_group->space_info->lock); 7329f21246dSJosef Bacik spin_lock(&block_group->lock); 733b3470b5dSDavid Sterba bytes_used = block_group->length - block_group->used; 7349f21246dSJosef Bacik block_group->space_info->bytes_used += bytes_used >> 1; 7359f21246dSJosef Bacik spin_unlock(&block_group->lock); 7369f21246dSJosef Bacik spin_unlock(&block_group->space_info->lock); 737e11c0406SJosef Bacik fragment_free_space(block_group); 7389f21246dSJosef Bacik } 7399f21246dSJosef Bacik #endif 7409f21246dSJosef Bacik 7419f21246dSJosef Bacik caching_ctl->progress = (u64)-1; 7429f21246dSJosef Bacik 7439f21246dSJosef Bacik up_read(&fs_info->commit_root_sem); 7449f21246dSJosef Bacik btrfs_free_excluded_extents(block_group); 7459f21246dSJosef Bacik mutex_unlock(&caching_ctl->mutex); 7469f21246dSJosef Bacik 7479f21246dSJosef Bacik wake_up(&caching_ctl->wait); 7489f21246dSJosef Bacik 7499f21246dSJosef Bacik btrfs_put_caching_control(caching_ctl); 7509f21246dSJosef Bacik btrfs_put_block_group(block_group); 7519f21246dSJosef Bacik } 7529f21246dSJosef Bacik 75332da5386SDavid Sterba int btrfs_cache_block_group(struct btrfs_block_group *cache, int load_cache_only) 7549f21246dSJosef Bacik { 7559f21246dSJosef Bacik DEFINE_WAIT(wait); 7569f21246dSJosef Bacik struct btrfs_fs_info *fs_info = cache->fs_info; 757e747853cSJosef Bacik struct btrfs_caching_control *caching_ctl = NULL; 7589f21246dSJosef Bacik int ret = 0; 7599f21246dSJosef Bacik 7602eda5708SNaohiro Aota /* Allocator for zoned filesystems does not use the cache at all */ 7612eda5708SNaohiro Aota if (btrfs_is_zoned(fs_info)) 7622eda5708SNaohiro Aota return 0; 7632eda5708SNaohiro Aota 7649f21246dSJosef Bacik caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS); 7659f21246dSJosef Bacik if (!caching_ctl) 7669f21246dSJosef Bacik return -ENOMEM; 7679f21246dSJosef Bacik 7689f21246dSJosef Bacik INIT_LIST_HEAD(&caching_ctl->list); 7699f21246dSJosef Bacik mutex_init(&caching_ctl->mutex); 7709f21246dSJosef Bacik init_waitqueue_head(&caching_ctl->wait); 7719f21246dSJosef Bacik caching_ctl->block_group = cache; 772b3470b5dSDavid Sterba caching_ctl->progress = cache->start; 773e747853cSJosef Bacik refcount_set(&caching_ctl->count, 2); 774a0cac0ecSOmar Sandoval btrfs_init_work(&caching_ctl->work, caching_thread, NULL, NULL); 7759f21246dSJosef Bacik 7769f21246dSJosef Bacik spin_lock(&cache->lock); 7779f21246dSJosef Bacik if (cache->cached != BTRFS_CACHE_NO) { 7789f21246dSJosef Bacik kfree(caching_ctl); 779e747853cSJosef Bacik 780e747853cSJosef Bacik caching_ctl = cache->caching_ctl; 781e747853cSJosef Bacik if (caching_ctl) 782e747853cSJosef Bacik refcount_inc(&caching_ctl->count); 783e747853cSJosef Bacik spin_unlock(&cache->lock); 784e747853cSJosef Bacik goto out; 7859f21246dSJosef Bacik } 7869f21246dSJosef Bacik WARN_ON(cache->caching_ctl); 7879f21246dSJosef Bacik cache->caching_ctl = caching_ctl; 788e747853cSJosef Bacik if (btrfs_test_opt(fs_info, SPACE_CACHE)) 7899f21246dSJosef Bacik cache->cached = BTRFS_CACHE_FAST; 790e747853cSJosef Bacik else 7919f21246dSJosef Bacik cache->cached = BTRFS_CACHE_STARTED; 7929f21246dSJosef Bacik cache->has_caching_ctl = 1; 7939f21246dSJosef Bacik spin_unlock(&cache->lock); 7949f21246dSJosef Bacik 79516b0c258SFilipe Manana write_lock(&fs_info->block_group_cache_lock); 7969f21246dSJosef Bacik refcount_inc(&caching_ctl->count); 7979f21246dSJosef Bacik list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups); 79816b0c258SFilipe Manana write_unlock(&fs_info->block_group_cache_lock); 7999f21246dSJosef Bacik 8009f21246dSJosef Bacik btrfs_get_block_group(cache); 8019f21246dSJosef Bacik 8029f21246dSJosef Bacik btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work); 803e747853cSJosef Bacik out: 804e747853cSJosef Bacik if (load_cache_only && caching_ctl) 805e747853cSJosef Bacik btrfs_wait_space_cache_v1_finished(cache, caching_ctl); 806e747853cSJosef Bacik if (caching_ctl) 807e747853cSJosef Bacik btrfs_put_caching_control(caching_ctl); 8089f21246dSJosef Bacik 8099f21246dSJosef Bacik return ret; 8109f21246dSJosef Bacik } 811e3e0520bSJosef Bacik 812e3e0520bSJosef Bacik static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) 813e3e0520bSJosef Bacik { 814e3e0520bSJosef Bacik u64 extra_flags = chunk_to_extended(flags) & 815e3e0520bSJosef Bacik BTRFS_EXTENDED_PROFILE_MASK; 816e3e0520bSJosef Bacik 817e3e0520bSJosef Bacik write_seqlock(&fs_info->profiles_lock); 818e3e0520bSJosef Bacik if (flags & BTRFS_BLOCK_GROUP_DATA) 819e3e0520bSJosef Bacik fs_info->avail_data_alloc_bits &= ~extra_flags; 820e3e0520bSJosef Bacik if (flags & BTRFS_BLOCK_GROUP_METADATA) 821e3e0520bSJosef Bacik fs_info->avail_metadata_alloc_bits &= ~extra_flags; 822e3e0520bSJosef Bacik if (flags & BTRFS_BLOCK_GROUP_SYSTEM) 823e3e0520bSJosef Bacik fs_info->avail_system_alloc_bits &= ~extra_flags; 824e3e0520bSJosef Bacik write_sequnlock(&fs_info->profiles_lock); 825e3e0520bSJosef Bacik } 826e3e0520bSJosef Bacik 827e3e0520bSJosef Bacik /* 828e3e0520bSJosef Bacik * Clear incompat bits for the following feature(s): 829e3e0520bSJosef Bacik * 830e3e0520bSJosef Bacik * - RAID56 - in case there's neither RAID5 nor RAID6 profile block group 831e3e0520bSJosef Bacik * in the whole filesystem 8329c907446SDavid Sterba * 8339c907446SDavid Sterba * - RAID1C34 - same as above for RAID1C3 and RAID1C4 block groups 834e3e0520bSJosef Bacik */ 835e3e0520bSJosef Bacik static void clear_incompat_bg_bits(struct btrfs_fs_info *fs_info, u64 flags) 836e3e0520bSJosef Bacik { 8379c907446SDavid Sterba bool found_raid56 = false; 8389c907446SDavid Sterba bool found_raid1c34 = false; 8399c907446SDavid Sterba 8409c907446SDavid Sterba if ((flags & BTRFS_BLOCK_GROUP_RAID56_MASK) || 8419c907446SDavid Sterba (flags & BTRFS_BLOCK_GROUP_RAID1C3) || 8429c907446SDavid Sterba (flags & BTRFS_BLOCK_GROUP_RAID1C4)) { 843e3e0520bSJosef Bacik struct list_head *head = &fs_info->space_info; 844e3e0520bSJosef Bacik struct btrfs_space_info *sinfo; 845e3e0520bSJosef Bacik 846e3e0520bSJosef Bacik list_for_each_entry_rcu(sinfo, head, list) { 847e3e0520bSJosef Bacik down_read(&sinfo->groups_sem); 848e3e0520bSJosef Bacik if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID5])) 8499c907446SDavid Sterba found_raid56 = true; 850e3e0520bSJosef Bacik if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID6])) 8519c907446SDavid Sterba found_raid56 = true; 8529c907446SDavid Sterba if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID1C3])) 8539c907446SDavid Sterba found_raid1c34 = true; 8549c907446SDavid Sterba if (!list_empty(&sinfo->block_groups[BTRFS_RAID_RAID1C4])) 8559c907446SDavid Sterba found_raid1c34 = true; 856e3e0520bSJosef Bacik up_read(&sinfo->groups_sem); 857e3e0520bSJosef Bacik } 858d8e6fd5cSFilipe Manana if (!found_raid56) 859e3e0520bSJosef Bacik btrfs_clear_fs_incompat(fs_info, RAID56); 860d8e6fd5cSFilipe Manana if (!found_raid1c34) 8619c907446SDavid Sterba btrfs_clear_fs_incompat(fs_info, RAID1C34); 862e3e0520bSJosef Bacik } 863e3e0520bSJosef Bacik } 864e3e0520bSJosef Bacik 8657357623aSQu Wenruo static int remove_block_group_item(struct btrfs_trans_handle *trans, 8667357623aSQu Wenruo struct btrfs_path *path, 8677357623aSQu Wenruo struct btrfs_block_group *block_group) 8687357623aSQu Wenruo { 8697357623aSQu Wenruo struct btrfs_fs_info *fs_info = trans->fs_info; 8707357623aSQu Wenruo struct btrfs_root *root; 8717357623aSQu Wenruo struct btrfs_key key; 8727357623aSQu Wenruo int ret; 8737357623aSQu Wenruo 874dfe8aec4SJosef Bacik root = btrfs_block_group_root(fs_info); 8757357623aSQu Wenruo key.objectid = block_group->start; 8767357623aSQu Wenruo key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 8777357623aSQu Wenruo key.offset = block_group->length; 8787357623aSQu Wenruo 8797357623aSQu Wenruo ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 8807357623aSQu Wenruo if (ret > 0) 8817357623aSQu Wenruo ret = -ENOENT; 8827357623aSQu Wenruo if (ret < 0) 8837357623aSQu Wenruo return ret; 8847357623aSQu Wenruo 8857357623aSQu Wenruo ret = btrfs_del_item(trans, root, path); 8867357623aSQu Wenruo return ret; 8877357623aSQu Wenruo } 8887357623aSQu Wenruo 889e3e0520bSJosef Bacik int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 890e3e0520bSJosef Bacik u64 group_start, struct extent_map *em) 891e3e0520bSJosef Bacik { 892e3e0520bSJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 893e3e0520bSJosef Bacik struct btrfs_path *path; 89432da5386SDavid Sterba struct btrfs_block_group *block_group; 895e3e0520bSJosef Bacik struct btrfs_free_cluster *cluster; 896e3e0520bSJosef Bacik struct inode *inode; 897e3e0520bSJosef Bacik struct kobject *kobj = NULL; 898e3e0520bSJosef Bacik int ret; 899e3e0520bSJosef Bacik int index; 900e3e0520bSJosef Bacik int factor; 901e3e0520bSJosef Bacik struct btrfs_caching_control *caching_ctl = NULL; 902e3e0520bSJosef Bacik bool remove_em; 903e3e0520bSJosef Bacik bool remove_rsv = false; 904e3e0520bSJosef Bacik 905e3e0520bSJosef Bacik block_group = btrfs_lookup_block_group(fs_info, group_start); 906e3e0520bSJosef Bacik BUG_ON(!block_group); 907e3e0520bSJosef Bacik BUG_ON(!block_group->ro); 908e3e0520bSJosef Bacik 909e3e0520bSJosef Bacik trace_btrfs_remove_block_group(block_group); 910e3e0520bSJosef Bacik /* 911e3e0520bSJosef Bacik * Free the reserved super bytes from this block group before 912e3e0520bSJosef Bacik * remove it. 913e3e0520bSJosef Bacik */ 914e3e0520bSJosef Bacik btrfs_free_excluded_extents(block_group); 915b3470b5dSDavid Sterba btrfs_free_ref_tree_range(fs_info, block_group->start, 916b3470b5dSDavid Sterba block_group->length); 917e3e0520bSJosef Bacik 918e3e0520bSJosef Bacik index = btrfs_bg_flags_to_raid_index(block_group->flags); 919e3e0520bSJosef Bacik factor = btrfs_bg_type_to_factor(block_group->flags); 920e3e0520bSJosef Bacik 921e3e0520bSJosef Bacik /* make sure this block group isn't part of an allocation cluster */ 922e3e0520bSJosef Bacik cluster = &fs_info->data_alloc_cluster; 923e3e0520bSJosef Bacik spin_lock(&cluster->refill_lock); 924e3e0520bSJosef Bacik btrfs_return_cluster_to_free_space(block_group, cluster); 925e3e0520bSJosef Bacik spin_unlock(&cluster->refill_lock); 926e3e0520bSJosef Bacik 927e3e0520bSJosef Bacik /* 928e3e0520bSJosef Bacik * make sure this block group isn't part of a metadata 929e3e0520bSJosef Bacik * allocation cluster 930e3e0520bSJosef Bacik */ 931e3e0520bSJosef Bacik cluster = &fs_info->meta_alloc_cluster; 932e3e0520bSJosef Bacik spin_lock(&cluster->refill_lock); 933e3e0520bSJosef Bacik btrfs_return_cluster_to_free_space(block_group, cluster); 934e3e0520bSJosef Bacik spin_unlock(&cluster->refill_lock); 935e3e0520bSJosef Bacik 93640ab3be1SNaohiro Aota btrfs_clear_treelog_bg(block_group); 937c2707a25SJohannes Thumshirn btrfs_clear_data_reloc_bg(block_group); 93840ab3be1SNaohiro Aota 939e3e0520bSJosef Bacik path = btrfs_alloc_path(); 940e3e0520bSJosef Bacik if (!path) { 941e3e0520bSJosef Bacik ret = -ENOMEM; 9429fecd132SFilipe Manana goto out; 943e3e0520bSJosef Bacik } 944e3e0520bSJosef Bacik 945e3e0520bSJosef Bacik /* 946e3e0520bSJosef Bacik * get the inode first so any iput calls done for the io_list 947e3e0520bSJosef Bacik * aren't the final iput (no unlinks allowed now) 948e3e0520bSJosef Bacik */ 949e3e0520bSJosef Bacik inode = lookup_free_space_inode(block_group, path); 950e3e0520bSJosef Bacik 951e3e0520bSJosef Bacik mutex_lock(&trans->transaction->cache_write_mutex); 952e3e0520bSJosef Bacik /* 953e3e0520bSJosef Bacik * Make sure our free space cache IO is done before removing the 954e3e0520bSJosef Bacik * free space inode 955e3e0520bSJosef Bacik */ 956e3e0520bSJosef Bacik spin_lock(&trans->transaction->dirty_bgs_lock); 957e3e0520bSJosef Bacik if (!list_empty(&block_group->io_list)) { 958e3e0520bSJosef Bacik list_del_init(&block_group->io_list); 959e3e0520bSJosef Bacik 960e3e0520bSJosef Bacik WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode); 961e3e0520bSJosef Bacik 962e3e0520bSJosef Bacik spin_unlock(&trans->transaction->dirty_bgs_lock); 963e3e0520bSJosef Bacik btrfs_wait_cache_io(trans, block_group, path); 964e3e0520bSJosef Bacik btrfs_put_block_group(block_group); 965e3e0520bSJosef Bacik spin_lock(&trans->transaction->dirty_bgs_lock); 966e3e0520bSJosef Bacik } 967e3e0520bSJosef Bacik 968e3e0520bSJosef Bacik if (!list_empty(&block_group->dirty_list)) { 969e3e0520bSJosef Bacik list_del_init(&block_group->dirty_list); 970e3e0520bSJosef Bacik remove_rsv = true; 971e3e0520bSJosef Bacik btrfs_put_block_group(block_group); 972e3e0520bSJosef Bacik } 973e3e0520bSJosef Bacik spin_unlock(&trans->transaction->dirty_bgs_lock); 974e3e0520bSJosef Bacik mutex_unlock(&trans->transaction->cache_write_mutex); 975e3e0520bSJosef Bacik 97636b216c8SBoris Burkov ret = btrfs_remove_free_space_inode(trans, inode, block_group); 977e3e0520bSJosef Bacik if (ret) 9789fecd132SFilipe Manana goto out; 979e3e0520bSJosef Bacik 98016b0c258SFilipe Manana write_lock(&fs_info->block_group_cache_lock); 98108dddb29SFilipe Manana rb_erase_cached(&block_group->cache_node, 982e3e0520bSJosef Bacik &fs_info->block_group_cache_tree); 983e3e0520bSJosef Bacik RB_CLEAR_NODE(&block_group->cache_node); 984e3e0520bSJosef Bacik 9859fecd132SFilipe Manana /* Once for the block groups rbtree */ 9869fecd132SFilipe Manana btrfs_put_block_group(block_group); 9879fecd132SFilipe Manana 98816b0c258SFilipe Manana write_unlock(&fs_info->block_group_cache_lock); 989e3e0520bSJosef Bacik 990e3e0520bSJosef Bacik down_write(&block_group->space_info->groups_sem); 991e3e0520bSJosef Bacik /* 992e3e0520bSJosef Bacik * we must use list_del_init so people can check to see if they 993e3e0520bSJosef Bacik * are still on the list after taking the semaphore 994e3e0520bSJosef Bacik */ 995e3e0520bSJosef Bacik list_del_init(&block_group->list); 996e3e0520bSJosef Bacik if (list_empty(&block_group->space_info->block_groups[index])) { 997e3e0520bSJosef Bacik kobj = block_group->space_info->block_group_kobjs[index]; 998e3e0520bSJosef Bacik block_group->space_info->block_group_kobjs[index] = NULL; 999e3e0520bSJosef Bacik clear_avail_alloc_bits(fs_info, block_group->flags); 1000e3e0520bSJosef Bacik } 1001e3e0520bSJosef Bacik up_write(&block_group->space_info->groups_sem); 1002e3e0520bSJosef Bacik clear_incompat_bg_bits(fs_info, block_group->flags); 1003e3e0520bSJosef Bacik if (kobj) { 1004e3e0520bSJosef Bacik kobject_del(kobj); 1005e3e0520bSJosef Bacik kobject_put(kobj); 1006e3e0520bSJosef Bacik } 1007e3e0520bSJosef Bacik 1008e3e0520bSJosef Bacik if (block_group->has_caching_ctl) 1009e3e0520bSJosef Bacik caching_ctl = btrfs_get_caching_control(block_group); 1010e3e0520bSJosef Bacik if (block_group->cached == BTRFS_CACHE_STARTED) 1011e3e0520bSJosef Bacik btrfs_wait_block_group_cache_done(block_group); 1012e3e0520bSJosef Bacik if (block_group->has_caching_ctl) { 101316b0c258SFilipe Manana write_lock(&fs_info->block_group_cache_lock); 1014e3e0520bSJosef Bacik if (!caching_ctl) { 1015e3e0520bSJosef Bacik struct btrfs_caching_control *ctl; 1016e3e0520bSJosef Bacik 1017e3e0520bSJosef Bacik list_for_each_entry(ctl, 1018e3e0520bSJosef Bacik &fs_info->caching_block_groups, list) 1019e3e0520bSJosef Bacik if (ctl->block_group == block_group) { 1020e3e0520bSJosef Bacik caching_ctl = ctl; 1021e3e0520bSJosef Bacik refcount_inc(&caching_ctl->count); 1022e3e0520bSJosef Bacik break; 1023e3e0520bSJosef Bacik } 1024e3e0520bSJosef Bacik } 1025e3e0520bSJosef Bacik if (caching_ctl) 1026e3e0520bSJosef Bacik list_del_init(&caching_ctl->list); 102716b0c258SFilipe Manana write_unlock(&fs_info->block_group_cache_lock); 1028e3e0520bSJosef Bacik if (caching_ctl) { 1029e3e0520bSJosef Bacik /* Once for the caching bgs list and once for us. */ 1030e3e0520bSJosef Bacik btrfs_put_caching_control(caching_ctl); 1031e3e0520bSJosef Bacik btrfs_put_caching_control(caching_ctl); 1032e3e0520bSJosef Bacik } 1033e3e0520bSJosef Bacik } 1034e3e0520bSJosef Bacik 1035e3e0520bSJosef Bacik spin_lock(&trans->transaction->dirty_bgs_lock); 1036e3e0520bSJosef Bacik WARN_ON(!list_empty(&block_group->dirty_list)); 1037e3e0520bSJosef Bacik WARN_ON(!list_empty(&block_group->io_list)); 1038e3e0520bSJosef Bacik spin_unlock(&trans->transaction->dirty_bgs_lock); 1039e3e0520bSJosef Bacik 1040e3e0520bSJosef Bacik btrfs_remove_free_space_cache(block_group); 1041e3e0520bSJosef Bacik 1042e3e0520bSJosef Bacik spin_lock(&block_group->space_info->lock); 1043e3e0520bSJosef Bacik list_del_init(&block_group->ro_list); 1044e3e0520bSJosef Bacik 1045e3e0520bSJosef Bacik if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { 1046e3e0520bSJosef Bacik WARN_ON(block_group->space_info->total_bytes 1047b3470b5dSDavid Sterba < block_group->length); 1048e3e0520bSJosef Bacik WARN_ON(block_group->space_info->bytes_readonly 1049169e0da9SNaohiro Aota < block_group->length - block_group->zone_unusable); 1050169e0da9SNaohiro Aota WARN_ON(block_group->space_info->bytes_zone_unusable 1051169e0da9SNaohiro Aota < block_group->zone_unusable); 1052e3e0520bSJosef Bacik WARN_ON(block_group->space_info->disk_total 1053b3470b5dSDavid Sterba < block_group->length * factor); 1054e3e0520bSJosef Bacik } 1055b3470b5dSDavid Sterba block_group->space_info->total_bytes -= block_group->length; 1056169e0da9SNaohiro Aota block_group->space_info->bytes_readonly -= 1057169e0da9SNaohiro Aota (block_group->length - block_group->zone_unusable); 1058169e0da9SNaohiro Aota block_group->space_info->bytes_zone_unusable -= 1059169e0da9SNaohiro Aota block_group->zone_unusable; 1060b3470b5dSDavid Sterba block_group->space_info->disk_total -= block_group->length * factor; 1061e3e0520bSJosef Bacik 1062e3e0520bSJosef Bacik spin_unlock(&block_group->space_info->lock); 1063e3e0520bSJosef Bacik 1064ffcb9d44SFilipe Manana /* 1065ffcb9d44SFilipe Manana * Remove the free space for the block group from the free space tree 1066ffcb9d44SFilipe Manana * and the block group's item from the extent tree before marking the 1067ffcb9d44SFilipe Manana * block group as removed. This is to prevent races with tasks that 1068ffcb9d44SFilipe Manana * freeze and unfreeze a block group, this task and another task 1069ffcb9d44SFilipe Manana * allocating a new block group - the unfreeze task ends up removing 1070ffcb9d44SFilipe Manana * the block group's extent map before the task calling this function 1071ffcb9d44SFilipe Manana * deletes the block group item from the extent tree, allowing for 1072ffcb9d44SFilipe Manana * another task to attempt to create another block group with the same 1073ffcb9d44SFilipe Manana * item key (and failing with -EEXIST and a transaction abort). 1074ffcb9d44SFilipe Manana */ 1075ffcb9d44SFilipe Manana ret = remove_block_group_free_space(trans, block_group); 1076ffcb9d44SFilipe Manana if (ret) 1077ffcb9d44SFilipe Manana goto out; 1078ffcb9d44SFilipe Manana 1079ffcb9d44SFilipe Manana ret = remove_block_group_item(trans, path, block_group); 1080ffcb9d44SFilipe Manana if (ret < 0) 1081ffcb9d44SFilipe Manana goto out; 1082ffcb9d44SFilipe Manana 1083e3e0520bSJosef Bacik spin_lock(&block_group->lock); 1084e3e0520bSJosef Bacik block_group->removed = 1; 1085e3e0520bSJosef Bacik /* 10866b7304afSFilipe Manana * At this point trimming or scrub can't start on this block group, 10876b7304afSFilipe Manana * because we removed the block group from the rbtree 10886b7304afSFilipe Manana * fs_info->block_group_cache_tree so no one can't find it anymore and 10896b7304afSFilipe Manana * even if someone already got this block group before we removed it 10906b7304afSFilipe Manana * from the rbtree, they have already incremented block_group->frozen - 10916b7304afSFilipe Manana * if they didn't, for the trimming case they won't find any free space 10926b7304afSFilipe Manana * entries because we already removed them all when we called 10936b7304afSFilipe Manana * btrfs_remove_free_space_cache(). 1094e3e0520bSJosef Bacik * 1095e3e0520bSJosef Bacik * And we must not remove the extent map from the fs_info->mapping_tree 1096e3e0520bSJosef Bacik * to prevent the same logical address range and physical device space 10976b7304afSFilipe Manana * ranges from being reused for a new block group. This is needed to 10986b7304afSFilipe Manana * avoid races with trimming and scrub. 10996b7304afSFilipe Manana * 11006b7304afSFilipe Manana * An fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is 1101e3e0520bSJosef Bacik * completely transactionless, so while it is trimming a range the 1102e3e0520bSJosef Bacik * currently running transaction might finish and a new one start, 1103e3e0520bSJosef Bacik * allowing for new block groups to be created that can reuse the same 1104e3e0520bSJosef Bacik * physical device locations unless we take this special care. 1105e3e0520bSJosef Bacik * 1106e3e0520bSJosef Bacik * There may also be an implicit trim operation if the file system 1107e3e0520bSJosef Bacik * is mounted with -odiscard. The same protections must remain 1108e3e0520bSJosef Bacik * in place until the extents have been discarded completely when 1109e3e0520bSJosef Bacik * the transaction commit has completed. 1110e3e0520bSJosef Bacik */ 11116b7304afSFilipe Manana remove_em = (atomic_read(&block_group->frozen) == 0); 1112e3e0520bSJosef Bacik spin_unlock(&block_group->lock); 1113e3e0520bSJosef Bacik 1114e3e0520bSJosef Bacik if (remove_em) { 1115e3e0520bSJosef Bacik struct extent_map_tree *em_tree; 1116e3e0520bSJosef Bacik 1117e3e0520bSJosef Bacik em_tree = &fs_info->mapping_tree; 1118e3e0520bSJosef Bacik write_lock(&em_tree->lock); 1119e3e0520bSJosef Bacik remove_extent_mapping(em_tree, em); 1120e3e0520bSJosef Bacik write_unlock(&em_tree->lock); 1121e3e0520bSJosef Bacik /* once for the tree */ 1122e3e0520bSJosef Bacik free_extent_map(em); 1123e3e0520bSJosef Bacik } 1124f6033c5eSXiyu Yang 11259fecd132SFilipe Manana out: 1126f6033c5eSXiyu Yang /* Once for the lookup reference */ 1127f6033c5eSXiyu Yang btrfs_put_block_group(block_group); 1128e3e0520bSJosef Bacik if (remove_rsv) 1129e3e0520bSJosef Bacik btrfs_delayed_refs_rsv_release(fs_info, 1); 1130e3e0520bSJosef Bacik btrfs_free_path(path); 1131e3e0520bSJosef Bacik return ret; 1132e3e0520bSJosef Bacik } 1133e3e0520bSJosef Bacik 1134e3e0520bSJosef Bacik struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( 1135e3e0520bSJosef Bacik struct btrfs_fs_info *fs_info, const u64 chunk_offset) 1136e3e0520bSJosef Bacik { 1137dfe8aec4SJosef Bacik struct btrfs_root *root = btrfs_block_group_root(fs_info); 1138e3e0520bSJosef Bacik struct extent_map_tree *em_tree = &fs_info->mapping_tree; 1139e3e0520bSJosef Bacik struct extent_map *em; 1140e3e0520bSJosef Bacik struct map_lookup *map; 1141e3e0520bSJosef Bacik unsigned int num_items; 1142e3e0520bSJosef Bacik 1143e3e0520bSJosef Bacik read_lock(&em_tree->lock); 1144e3e0520bSJosef Bacik em = lookup_extent_mapping(em_tree, chunk_offset, 1); 1145e3e0520bSJosef Bacik read_unlock(&em_tree->lock); 1146e3e0520bSJosef Bacik ASSERT(em && em->start == chunk_offset); 1147e3e0520bSJosef Bacik 1148e3e0520bSJosef Bacik /* 1149e3e0520bSJosef Bacik * We need to reserve 3 + N units from the metadata space info in order 1150e3e0520bSJosef Bacik * to remove a block group (done at btrfs_remove_chunk() and at 1151e3e0520bSJosef Bacik * btrfs_remove_block_group()), which are used for: 1152e3e0520bSJosef Bacik * 1153e3e0520bSJosef Bacik * 1 unit for adding the free space inode's orphan (located in the tree 1154e3e0520bSJosef Bacik * of tree roots). 1155e3e0520bSJosef Bacik * 1 unit for deleting the block group item (located in the extent 1156e3e0520bSJosef Bacik * tree). 1157e3e0520bSJosef Bacik * 1 unit for deleting the free space item (located in tree of tree 1158e3e0520bSJosef Bacik * roots). 1159e3e0520bSJosef Bacik * N units for deleting N device extent items corresponding to each 1160e3e0520bSJosef Bacik * stripe (located in the device tree). 1161e3e0520bSJosef Bacik * 1162e3e0520bSJosef Bacik * In order to remove a block group we also need to reserve units in the 1163e3e0520bSJosef Bacik * system space info in order to update the chunk tree (update one or 1164e3e0520bSJosef Bacik * more device items and remove one chunk item), but this is done at 1165e3e0520bSJosef Bacik * btrfs_remove_chunk() through a call to check_system_chunk(). 1166e3e0520bSJosef Bacik */ 1167e3e0520bSJosef Bacik map = em->map_lookup; 1168e3e0520bSJosef Bacik num_items = 3 + map->num_stripes; 1169e3e0520bSJosef Bacik free_extent_map(em); 1170e3e0520bSJosef Bacik 1171dfe8aec4SJosef Bacik return btrfs_start_transaction_fallback_global_rsv(root, num_items); 1172e3e0520bSJosef Bacik } 1173e3e0520bSJosef Bacik 1174e3e0520bSJosef Bacik /* 117526ce2095SJosef Bacik * Mark block group @cache read-only, so later write won't happen to block 117626ce2095SJosef Bacik * group @cache. 117726ce2095SJosef Bacik * 117826ce2095SJosef Bacik * If @force is not set, this function will only mark the block group readonly 117926ce2095SJosef Bacik * if we have enough free space (1M) in other metadata/system block groups. 118026ce2095SJosef Bacik * If @force is not set, this function will mark the block group readonly 118126ce2095SJosef Bacik * without checking free space. 118226ce2095SJosef Bacik * 118326ce2095SJosef Bacik * NOTE: This function doesn't care if other block groups can contain all the 118426ce2095SJosef Bacik * data in this block group. That check should be done by relocation routine, 118526ce2095SJosef Bacik * not this function. 118626ce2095SJosef Bacik */ 118732da5386SDavid Sterba static int inc_block_group_ro(struct btrfs_block_group *cache, int force) 118826ce2095SJosef Bacik { 118926ce2095SJosef Bacik struct btrfs_space_info *sinfo = cache->space_info; 119026ce2095SJosef Bacik u64 num_bytes; 119126ce2095SJosef Bacik int ret = -ENOSPC; 119226ce2095SJosef Bacik 119326ce2095SJosef Bacik spin_lock(&sinfo->lock); 119426ce2095SJosef Bacik spin_lock(&cache->lock); 119526ce2095SJosef Bacik 1196195a49eaSFilipe Manana if (cache->swap_extents) { 1197195a49eaSFilipe Manana ret = -ETXTBSY; 1198195a49eaSFilipe Manana goto out; 1199195a49eaSFilipe Manana } 1200195a49eaSFilipe Manana 120126ce2095SJosef Bacik if (cache->ro) { 120226ce2095SJosef Bacik cache->ro++; 120326ce2095SJosef Bacik ret = 0; 120426ce2095SJosef Bacik goto out; 120526ce2095SJosef Bacik } 120626ce2095SJosef Bacik 1207b3470b5dSDavid Sterba num_bytes = cache->length - cache->reserved - cache->pinned - 1208169e0da9SNaohiro Aota cache->bytes_super - cache->zone_unusable - cache->used; 120926ce2095SJosef Bacik 121026ce2095SJosef Bacik /* 1211a30a3d20SJosef Bacik * Data never overcommits, even in mixed mode, so do just the straight 1212a30a3d20SJosef Bacik * check of left over space in how much we have allocated. 1213a30a3d20SJosef Bacik */ 1214a30a3d20SJosef Bacik if (force) { 1215a30a3d20SJosef Bacik ret = 0; 1216a30a3d20SJosef Bacik } else if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA) { 1217a30a3d20SJosef Bacik u64 sinfo_used = btrfs_space_info_used(sinfo, true); 1218a30a3d20SJosef Bacik 1219a30a3d20SJosef Bacik /* 122026ce2095SJosef Bacik * Here we make sure if we mark this bg RO, we still have enough 1221f8935566SJosef Bacik * free space as buffer. 122226ce2095SJosef Bacik */ 1223a30a3d20SJosef Bacik if (sinfo_used + num_bytes <= sinfo->total_bytes) 1224a30a3d20SJosef Bacik ret = 0; 1225a30a3d20SJosef Bacik } else { 1226a30a3d20SJosef Bacik /* 1227a30a3d20SJosef Bacik * We overcommit metadata, so we need to do the 1228a30a3d20SJosef Bacik * btrfs_can_overcommit check here, and we need to pass in 1229a30a3d20SJosef Bacik * BTRFS_RESERVE_NO_FLUSH to give ourselves the most amount of 1230a30a3d20SJosef Bacik * leeway to allow us to mark this block group as read only. 1231a30a3d20SJosef Bacik */ 1232a30a3d20SJosef Bacik if (btrfs_can_overcommit(cache->fs_info, sinfo, num_bytes, 1233a30a3d20SJosef Bacik BTRFS_RESERVE_NO_FLUSH)) 1234a30a3d20SJosef Bacik ret = 0; 1235a30a3d20SJosef Bacik } 1236a30a3d20SJosef Bacik 1237a30a3d20SJosef Bacik if (!ret) { 123826ce2095SJosef Bacik sinfo->bytes_readonly += num_bytes; 1239169e0da9SNaohiro Aota if (btrfs_is_zoned(cache->fs_info)) { 1240169e0da9SNaohiro Aota /* Migrate zone_unusable bytes to readonly */ 1241169e0da9SNaohiro Aota sinfo->bytes_readonly += cache->zone_unusable; 1242169e0da9SNaohiro Aota sinfo->bytes_zone_unusable -= cache->zone_unusable; 1243169e0da9SNaohiro Aota cache->zone_unusable = 0; 1244169e0da9SNaohiro Aota } 124526ce2095SJosef Bacik cache->ro++; 124626ce2095SJosef Bacik list_add_tail(&cache->ro_list, &sinfo->ro_bgs); 124726ce2095SJosef Bacik } 124826ce2095SJosef Bacik out: 124926ce2095SJosef Bacik spin_unlock(&cache->lock); 125026ce2095SJosef Bacik spin_unlock(&sinfo->lock); 125126ce2095SJosef Bacik if (ret == -ENOSPC && btrfs_test_opt(cache->fs_info, ENOSPC_DEBUG)) { 125226ce2095SJosef Bacik btrfs_info(cache->fs_info, 1253b3470b5dSDavid Sterba "unable to make block group %llu ro", cache->start); 125426ce2095SJosef Bacik btrfs_dump_space_info(cache->fs_info, cache->space_info, 0, 0); 125526ce2095SJosef Bacik } 125626ce2095SJosef Bacik return ret; 125726ce2095SJosef Bacik } 125826ce2095SJosef Bacik 1259fe119a6eSNikolay Borisov static bool clean_pinned_extents(struct btrfs_trans_handle *trans, 1260fe119a6eSNikolay Borisov struct btrfs_block_group *bg) 126145bb5d6aSNikolay Borisov { 126245bb5d6aSNikolay Borisov struct btrfs_fs_info *fs_info = bg->fs_info; 1263fe119a6eSNikolay Borisov struct btrfs_transaction *prev_trans = NULL; 126445bb5d6aSNikolay Borisov const u64 start = bg->start; 126545bb5d6aSNikolay Borisov const u64 end = start + bg->length - 1; 126645bb5d6aSNikolay Borisov int ret; 126745bb5d6aSNikolay Borisov 1268fe119a6eSNikolay Borisov spin_lock(&fs_info->trans_lock); 1269fe119a6eSNikolay Borisov if (trans->transaction->list.prev != &fs_info->trans_list) { 1270fe119a6eSNikolay Borisov prev_trans = list_last_entry(&trans->transaction->list, 1271fe119a6eSNikolay Borisov struct btrfs_transaction, list); 1272fe119a6eSNikolay Borisov refcount_inc(&prev_trans->use_count); 1273fe119a6eSNikolay Borisov } 1274fe119a6eSNikolay Borisov spin_unlock(&fs_info->trans_lock); 1275fe119a6eSNikolay Borisov 127645bb5d6aSNikolay Borisov /* 127745bb5d6aSNikolay Borisov * Hold the unused_bg_unpin_mutex lock to avoid racing with 127845bb5d6aSNikolay Borisov * btrfs_finish_extent_commit(). If we are at transaction N, another 127945bb5d6aSNikolay Borisov * task might be running finish_extent_commit() for the previous 128045bb5d6aSNikolay Borisov * transaction N - 1, and have seen a range belonging to the block 1281fe119a6eSNikolay Borisov * group in pinned_extents before we were able to clear the whole block 1282fe119a6eSNikolay Borisov * group range from pinned_extents. This means that task can lookup for 1283fe119a6eSNikolay Borisov * the block group after we unpinned it from pinned_extents and removed 1284fe119a6eSNikolay Borisov * it, leading to a BUG_ON() at unpin_extent_range(). 128545bb5d6aSNikolay Borisov */ 128645bb5d6aSNikolay Borisov mutex_lock(&fs_info->unused_bg_unpin_mutex); 1287fe119a6eSNikolay Borisov if (prev_trans) { 1288fe119a6eSNikolay Borisov ret = clear_extent_bits(&prev_trans->pinned_extents, start, end, 128945bb5d6aSNikolay Borisov EXTENT_DIRTY); 129045bb5d6aSNikolay Borisov if (ret) 1291534cf531SFilipe Manana goto out; 1292fe119a6eSNikolay Borisov } 129345bb5d6aSNikolay Borisov 1294fe119a6eSNikolay Borisov ret = clear_extent_bits(&trans->transaction->pinned_extents, start, end, 129545bb5d6aSNikolay Borisov EXTENT_DIRTY); 1296534cf531SFilipe Manana out: 129745bb5d6aSNikolay Borisov mutex_unlock(&fs_info->unused_bg_unpin_mutex); 12985150bf19SFilipe Manana if (prev_trans) 12995150bf19SFilipe Manana btrfs_put_transaction(prev_trans); 130045bb5d6aSNikolay Borisov 1301534cf531SFilipe Manana return ret == 0; 130245bb5d6aSNikolay Borisov } 130345bb5d6aSNikolay Borisov 130426ce2095SJosef Bacik /* 1305e3e0520bSJosef Bacik * Process the unused_bgs list and remove any that don't have any allocated 1306e3e0520bSJosef Bacik * space inside of them. 1307e3e0520bSJosef Bacik */ 1308e3e0520bSJosef Bacik void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) 1309e3e0520bSJosef Bacik { 131032da5386SDavid Sterba struct btrfs_block_group *block_group; 1311e3e0520bSJosef Bacik struct btrfs_space_info *space_info; 1312e3e0520bSJosef Bacik struct btrfs_trans_handle *trans; 13136e80d4f8SDennis Zhou const bool async_trim_enabled = btrfs_test_opt(fs_info, DISCARD_ASYNC); 1314e3e0520bSJosef Bacik int ret = 0; 1315e3e0520bSJosef Bacik 1316e3e0520bSJosef Bacik if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags)) 1317e3e0520bSJosef Bacik return; 1318e3e0520bSJosef Bacik 1319ddfd08cbSJosef Bacik /* 1320ddfd08cbSJosef Bacik * Long running balances can keep us blocked here for eternity, so 1321ddfd08cbSJosef Bacik * simply skip deletion if we're unable to get the mutex. 1322ddfd08cbSJosef Bacik */ 1323f3372065SJohannes Thumshirn if (!mutex_trylock(&fs_info->reclaim_bgs_lock)) 1324ddfd08cbSJosef Bacik return; 1325ddfd08cbSJosef Bacik 1326e3e0520bSJosef Bacik spin_lock(&fs_info->unused_bgs_lock); 1327e3e0520bSJosef Bacik while (!list_empty(&fs_info->unused_bgs)) { 1328e3e0520bSJosef Bacik int trimming; 1329e3e0520bSJosef Bacik 1330e3e0520bSJosef Bacik block_group = list_first_entry(&fs_info->unused_bgs, 133132da5386SDavid Sterba struct btrfs_block_group, 1332e3e0520bSJosef Bacik bg_list); 1333e3e0520bSJosef Bacik list_del_init(&block_group->bg_list); 1334e3e0520bSJosef Bacik 1335e3e0520bSJosef Bacik space_info = block_group->space_info; 1336e3e0520bSJosef Bacik 1337e3e0520bSJosef Bacik if (ret || btrfs_mixed_space_info(space_info)) { 1338e3e0520bSJosef Bacik btrfs_put_block_group(block_group); 1339e3e0520bSJosef Bacik continue; 1340e3e0520bSJosef Bacik } 1341e3e0520bSJosef Bacik spin_unlock(&fs_info->unused_bgs_lock); 1342e3e0520bSJosef Bacik 1343b0643e59SDennis Zhou btrfs_discard_cancel_work(&fs_info->discard_ctl, block_group); 1344b0643e59SDennis Zhou 1345e3e0520bSJosef Bacik /* Don't want to race with allocators so take the groups_sem */ 1346e3e0520bSJosef Bacik down_write(&space_info->groups_sem); 13476e80d4f8SDennis Zhou 13486e80d4f8SDennis Zhou /* 13496e80d4f8SDennis Zhou * Async discard moves the final block group discard to be prior 13506e80d4f8SDennis Zhou * to the unused_bgs code path. Therefore, if it's not fully 13516e80d4f8SDennis Zhou * trimmed, punt it back to the async discard lists. 13526e80d4f8SDennis Zhou */ 13536e80d4f8SDennis Zhou if (btrfs_test_opt(fs_info, DISCARD_ASYNC) && 13546e80d4f8SDennis Zhou !btrfs_is_free_space_trimmed(block_group)) { 13556e80d4f8SDennis Zhou trace_btrfs_skip_unused_block_group(block_group); 13566e80d4f8SDennis Zhou up_write(&space_info->groups_sem); 13576e80d4f8SDennis Zhou /* Requeue if we failed because of async discard */ 13586e80d4f8SDennis Zhou btrfs_discard_queue_work(&fs_info->discard_ctl, 13596e80d4f8SDennis Zhou block_group); 13606e80d4f8SDennis Zhou goto next; 13616e80d4f8SDennis Zhou } 13626e80d4f8SDennis Zhou 1363e3e0520bSJosef Bacik spin_lock(&block_group->lock); 1364e3e0520bSJosef Bacik if (block_group->reserved || block_group->pinned || 1365bf38be65SDavid Sterba block_group->used || block_group->ro || 1366e3e0520bSJosef Bacik list_is_singular(&block_group->list)) { 1367e3e0520bSJosef Bacik /* 1368e3e0520bSJosef Bacik * We want to bail if we made new allocations or have 1369e3e0520bSJosef Bacik * outstanding allocations in this block group. We do 1370e3e0520bSJosef Bacik * the ro check in case balance is currently acting on 1371e3e0520bSJosef Bacik * this block group. 1372e3e0520bSJosef Bacik */ 1373e3e0520bSJosef Bacik trace_btrfs_skip_unused_block_group(block_group); 1374e3e0520bSJosef Bacik spin_unlock(&block_group->lock); 1375e3e0520bSJosef Bacik up_write(&space_info->groups_sem); 1376e3e0520bSJosef Bacik goto next; 1377e3e0520bSJosef Bacik } 1378e3e0520bSJosef Bacik spin_unlock(&block_group->lock); 1379e3e0520bSJosef Bacik 1380e3e0520bSJosef Bacik /* We don't want to force the issue, only flip if it's ok. */ 1381e11c0406SJosef Bacik ret = inc_block_group_ro(block_group, 0); 1382e3e0520bSJosef Bacik up_write(&space_info->groups_sem); 1383e3e0520bSJosef Bacik if (ret < 0) { 1384e3e0520bSJosef Bacik ret = 0; 1385e3e0520bSJosef Bacik goto next; 1386e3e0520bSJosef Bacik } 1387e3e0520bSJosef Bacik 1388e3e0520bSJosef Bacik /* 1389e3e0520bSJosef Bacik * Want to do this before we do anything else so we can recover 1390e3e0520bSJosef Bacik * properly if we fail to join the transaction. 1391e3e0520bSJosef Bacik */ 1392e3e0520bSJosef Bacik trans = btrfs_start_trans_remove_block_group(fs_info, 1393b3470b5dSDavid Sterba block_group->start); 1394e3e0520bSJosef Bacik if (IS_ERR(trans)) { 1395e3e0520bSJosef Bacik btrfs_dec_block_group_ro(block_group); 1396e3e0520bSJosef Bacik ret = PTR_ERR(trans); 1397e3e0520bSJosef Bacik goto next; 1398e3e0520bSJosef Bacik } 1399e3e0520bSJosef Bacik 1400e3e0520bSJosef Bacik /* 1401e3e0520bSJosef Bacik * We could have pending pinned extents for this block group, 1402e3e0520bSJosef Bacik * just delete them, we don't care about them anymore. 1403e3e0520bSJosef Bacik */ 1404534cf531SFilipe Manana if (!clean_pinned_extents(trans, block_group)) { 1405534cf531SFilipe Manana btrfs_dec_block_group_ro(block_group); 1406e3e0520bSJosef Bacik goto end_trans; 1407534cf531SFilipe Manana } 1408e3e0520bSJosef Bacik 1409b0643e59SDennis Zhou /* 1410b0643e59SDennis Zhou * At this point, the block_group is read only and should fail 1411b0643e59SDennis Zhou * new allocations. However, btrfs_finish_extent_commit() can 1412b0643e59SDennis Zhou * cause this block_group to be placed back on the discard 1413b0643e59SDennis Zhou * lists because now the block_group isn't fully discarded. 1414b0643e59SDennis Zhou * Bail here and try again later after discarding everything. 1415b0643e59SDennis Zhou */ 1416b0643e59SDennis Zhou spin_lock(&fs_info->discard_ctl.lock); 1417b0643e59SDennis Zhou if (!list_empty(&block_group->discard_list)) { 1418b0643e59SDennis Zhou spin_unlock(&fs_info->discard_ctl.lock); 1419b0643e59SDennis Zhou btrfs_dec_block_group_ro(block_group); 1420b0643e59SDennis Zhou btrfs_discard_queue_work(&fs_info->discard_ctl, 1421b0643e59SDennis Zhou block_group); 1422b0643e59SDennis Zhou goto end_trans; 1423b0643e59SDennis Zhou } 1424b0643e59SDennis Zhou spin_unlock(&fs_info->discard_ctl.lock); 1425b0643e59SDennis Zhou 1426e3e0520bSJosef Bacik /* Reset pinned so btrfs_put_block_group doesn't complain */ 1427e3e0520bSJosef Bacik spin_lock(&space_info->lock); 1428e3e0520bSJosef Bacik spin_lock(&block_group->lock); 1429e3e0520bSJosef Bacik 1430e3e0520bSJosef Bacik btrfs_space_info_update_bytes_pinned(fs_info, space_info, 1431e3e0520bSJosef Bacik -block_group->pinned); 1432e3e0520bSJosef Bacik space_info->bytes_readonly += block_group->pinned; 1433e3e0520bSJosef Bacik block_group->pinned = 0; 1434e3e0520bSJosef Bacik 1435e3e0520bSJosef Bacik spin_unlock(&block_group->lock); 1436e3e0520bSJosef Bacik spin_unlock(&space_info->lock); 1437e3e0520bSJosef Bacik 14386e80d4f8SDennis Zhou /* 14396e80d4f8SDennis Zhou * The normal path here is an unused block group is passed here, 14406e80d4f8SDennis Zhou * then trimming is handled in the transaction commit path. 14416e80d4f8SDennis Zhou * Async discard interposes before this to do the trimming 14426e80d4f8SDennis Zhou * before coming down the unused block group path as trimming 14436e80d4f8SDennis Zhou * will no longer be done later in the transaction commit path. 14446e80d4f8SDennis Zhou */ 14456e80d4f8SDennis Zhou if (!async_trim_enabled && btrfs_test_opt(fs_info, DISCARD_ASYNC)) 14466e80d4f8SDennis Zhou goto flip_async; 14476e80d4f8SDennis Zhou 1448dcba6e48SNaohiro Aota /* 1449dcba6e48SNaohiro Aota * DISCARD can flip during remount. On zoned filesystems, we 1450dcba6e48SNaohiro Aota * need to reset sequential-required zones. 1451dcba6e48SNaohiro Aota */ 1452dcba6e48SNaohiro Aota trimming = btrfs_test_opt(fs_info, DISCARD_SYNC) || 1453dcba6e48SNaohiro Aota btrfs_is_zoned(fs_info); 1454e3e0520bSJosef Bacik 1455e3e0520bSJosef Bacik /* Implicit trim during transaction commit. */ 1456e3e0520bSJosef Bacik if (trimming) 14576b7304afSFilipe Manana btrfs_freeze_block_group(block_group); 1458e3e0520bSJosef Bacik 1459e3e0520bSJosef Bacik /* 1460e3e0520bSJosef Bacik * Btrfs_remove_chunk will abort the transaction if things go 1461e3e0520bSJosef Bacik * horribly wrong. 1462e3e0520bSJosef Bacik */ 1463b3470b5dSDavid Sterba ret = btrfs_remove_chunk(trans, block_group->start); 1464e3e0520bSJosef Bacik 1465e3e0520bSJosef Bacik if (ret) { 1466e3e0520bSJosef Bacik if (trimming) 14676b7304afSFilipe Manana btrfs_unfreeze_block_group(block_group); 1468e3e0520bSJosef Bacik goto end_trans; 1469e3e0520bSJosef Bacik } 1470e3e0520bSJosef Bacik 1471e3e0520bSJosef Bacik /* 1472e3e0520bSJosef Bacik * If we're not mounted with -odiscard, we can just forget 1473e3e0520bSJosef Bacik * about this block group. Otherwise we'll need to wait 1474e3e0520bSJosef Bacik * until transaction commit to do the actual discard. 1475e3e0520bSJosef Bacik */ 1476e3e0520bSJosef Bacik if (trimming) { 1477e3e0520bSJosef Bacik spin_lock(&fs_info->unused_bgs_lock); 1478e3e0520bSJosef Bacik /* 1479e3e0520bSJosef Bacik * A concurrent scrub might have added us to the list 1480e3e0520bSJosef Bacik * fs_info->unused_bgs, so use a list_move operation 1481e3e0520bSJosef Bacik * to add the block group to the deleted_bgs list. 1482e3e0520bSJosef Bacik */ 1483e3e0520bSJosef Bacik list_move(&block_group->bg_list, 1484e3e0520bSJosef Bacik &trans->transaction->deleted_bgs); 1485e3e0520bSJosef Bacik spin_unlock(&fs_info->unused_bgs_lock); 1486e3e0520bSJosef Bacik btrfs_get_block_group(block_group); 1487e3e0520bSJosef Bacik } 1488e3e0520bSJosef Bacik end_trans: 1489e3e0520bSJosef Bacik btrfs_end_transaction(trans); 1490e3e0520bSJosef Bacik next: 1491e3e0520bSJosef Bacik btrfs_put_block_group(block_group); 1492e3e0520bSJosef Bacik spin_lock(&fs_info->unused_bgs_lock); 1493e3e0520bSJosef Bacik } 1494e3e0520bSJosef Bacik spin_unlock(&fs_info->unused_bgs_lock); 1495f3372065SJohannes Thumshirn mutex_unlock(&fs_info->reclaim_bgs_lock); 14966e80d4f8SDennis Zhou return; 14976e80d4f8SDennis Zhou 14986e80d4f8SDennis Zhou flip_async: 14996e80d4f8SDennis Zhou btrfs_end_transaction(trans); 1500f3372065SJohannes Thumshirn mutex_unlock(&fs_info->reclaim_bgs_lock); 15016e80d4f8SDennis Zhou btrfs_put_block_group(block_group); 15026e80d4f8SDennis Zhou btrfs_discard_punt_unused_bgs_list(fs_info); 1503e3e0520bSJosef Bacik } 1504e3e0520bSJosef Bacik 150532da5386SDavid Sterba void btrfs_mark_bg_unused(struct btrfs_block_group *bg) 1506e3e0520bSJosef Bacik { 1507e3e0520bSJosef Bacik struct btrfs_fs_info *fs_info = bg->fs_info; 1508e3e0520bSJosef Bacik 1509e3e0520bSJosef Bacik spin_lock(&fs_info->unused_bgs_lock); 1510e3e0520bSJosef Bacik if (list_empty(&bg->bg_list)) { 1511e3e0520bSJosef Bacik btrfs_get_block_group(bg); 1512e3e0520bSJosef Bacik trace_btrfs_add_unused_block_group(bg); 1513e3e0520bSJosef Bacik list_add_tail(&bg->bg_list, &fs_info->unused_bgs); 1514e3e0520bSJosef Bacik } 1515e3e0520bSJosef Bacik spin_unlock(&fs_info->unused_bgs_lock); 1516e3e0520bSJosef Bacik } 15174358d963SJosef Bacik 15182ca0ec77SJohannes Thumshirn /* 15192ca0ec77SJohannes Thumshirn * We want block groups with a low number of used bytes to be in the beginning 15202ca0ec77SJohannes Thumshirn * of the list, so they will get reclaimed first. 15212ca0ec77SJohannes Thumshirn */ 15222ca0ec77SJohannes Thumshirn static int reclaim_bgs_cmp(void *unused, const struct list_head *a, 15232ca0ec77SJohannes Thumshirn const struct list_head *b) 15242ca0ec77SJohannes Thumshirn { 15252ca0ec77SJohannes Thumshirn const struct btrfs_block_group *bg1, *bg2; 15262ca0ec77SJohannes Thumshirn 15272ca0ec77SJohannes Thumshirn bg1 = list_entry(a, struct btrfs_block_group, bg_list); 15282ca0ec77SJohannes Thumshirn bg2 = list_entry(b, struct btrfs_block_group, bg_list); 15292ca0ec77SJohannes Thumshirn 15302ca0ec77SJohannes Thumshirn return bg1->used > bg2->used; 15312ca0ec77SJohannes Thumshirn } 15322ca0ec77SJohannes Thumshirn 15333687fcb0SJohannes Thumshirn static inline bool btrfs_should_reclaim(struct btrfs_fs_info *fs_info) 15343687fcb0SJohannes Thumshirn { 15353687fcb0SJohannes Thumshirn if (btrfs_is_zoned(fs_info)) 15363687fcb0SJohannes Thumshirn return btrfs_zoned_should_reclaim(fs_info); 15373687fcb0SJohannes Thumshirn return true; 15383687fcb0SJohannes Thumshirn } 15393687fcb0SJohannes Thumshirn 154018bb8bbfSJohannes Thumshirn void btrfs_reclaim_bgs_work(struct work_struct *work) 154118bb8bbfSJohannes Thumshirn { 154218bb8bbfSJohannes Thumshirn struct btrfs_fs_info *fs_info = 154318bb8bbfSJohannes Thumshirn container_of(work, struct btrfs_fs_info, reclaim_bgs_work); 154418bb8bbfSJohannes Thumshirn struct btrfs_block_group *bg; 154518bb8bbfSJohannes Thumshirn struct btrfs_space_info *space_info; 154618bb8bbfSJohannes Thumshirn 154718bb8bbfSJohannes Thumshirn if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags)) 154818bb8bbfSJohannes Thumshirn return; 154918bb8bbfSJohannes Thumshirn 15503687fcb0SJohannes Thumshirn if (!btrfs_should_reclaim(fs_info)) 15513687fcb0SJohannes Thumshirn return; 15523687fcb0SJohannes Thumshirn 1553ca5e4ea0SNaohiro Aota sb_start_write(fs_info->sb); 1554ca5e4ea0SNaohiro Aota 1555ca5e4ea0SNaohiro Aota if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) { 1556ca5e4ea0SNaohiro Aota sb_end_write(fs_info->sb); 155718bb8bbfSJohannes Thumshirn return; 1558ca5e4ea0SNaohiro Aota } 155918bb8bbfSJohannes Thumshirn 15609cc0b837SJohannes Thumshirn /* 15619cc0b837SJohannes Thumshirn * Long running balances can keep us blocked here for eternity, so 15629cc0b837SJohannes Thumshirn * simply skip reclaim if we're unable to get the mutex. 15639cc0b837SJohannes Thumshirn */ 15649cc0b837SJohannes Thumshirn if (!mutex_trylock(&fs_info->reclaim_bgs_lock)) { 15659cc0b837SJohannes Thumshirn btrfs_exclop_finish(fs_info); 1566ca5e4ea0SNaohiro Aota sb_end_write(fs_info->sb); 15679cc0b837SJohannes Thumshirn return; 15689cc0b837SJohannes Thumshirn } 15699cc0b837SJohannes Thumshirn 157018bb8bbfSJohannes Thumshirn spin_lock(&fs_info->unused_bgs_lock); 15712ca0ec77SJohannes Thumshirn /* 15722ca0ec77SJohannes Thumshirn * Sort happens under lock because we can't simply splice it and sort. 15732ca0ec77SJohannes Thumshirn * The block groups might still be in use and reachable via bg_list, 15742ca0ec77SJohannes Thumshirn * and their presence in the reclaim_bgs list must be preserved. 15752ca0ec77SJohannes Thumshirn */ 15762ca0ec77SJohannes Thumshirn list_sort(NULL, &fs_info->reclaim_bgs, reclaim_bgs_cmp); 157718bb8bbfSJohannes Thumshirn while (!list_empty(&fs_info->reclaim_bgs)) { 15785f93e776SJohannes Thumshirn u64 zone_unusable; 15791cea5cf0SFilipe Manana int ret = 0; 15801cea5cf0SFilipe Manana 158118bb8bbfSJohannes Thumshirn bg = list_first_entry(&fs_info->reclaim_bgs, 158218bb8bbfSJohannes Thumshirn struct btrfs_block_group, 158318bb8bbfSJohannes Thumshirn bg_list); 158418bb8bbfSJohannes Thumshirn list_del_init(&bg->bg_list); 158518bb8bbfSJohannes Thumshirn 158618bb8bbfSJohannes Thumshirn space_info = bg->space_info; 158718bb8bbfSJohannes Thumshirn spin_unlock(&fs_info->unused_bgs_lock); 158818bb8bbfSJohannes Thumshirn 158918bb8bbfSJohannes Thumshirn /* Don't race with allocators so take the groups_sem */ 159018bb8bbfSJohannes Thumshirn down_write(&space_info->groups_sem); 159118bb8bbfSJohannes Thumshirn 159218bb8bbfSJohannes Thumshirn spin_lock(&bg->lock); 159318bb8bbfSJohannes Thumshirn if (bg->reserved || bg->pinned || bg->ro) { 159418bb8bbfSJohannes Thumshirn /* 159518bb8bbfSJohannes Thumshirn * We want to bail if we made new allocations or have 159618bb8bbfSJohannes Thumshirn * outstanding allocations in this block group. We do 159718bb8bbfSJohannes Thumshirn * the ro check in case balance is currently acting on 159818bb8bbfSJohannes Thumshirn * this block group. 159918bb8bbfSJohannes Thumshirn */ 160018bb8bbfSJohannes Thumshirn spin_unlock(&bg->lock); 160118bb8bbfSJohannes Thumshirn up_write(&space_info->groups_sem); 160218bb8bbfSJohannes Thumshirn goto next; 160318bb8bbfSJohannes Thumshirn } 160418bb8bbfSJohannes Thumshirn spin_unlock(&bg->lock); 160518bb8bbfSJohannes Thumshirn 160618bb8bbfSJohannes Thumshirn /* Get out fast, in case we're unmounting the filesystem */ 160718bb8bbfSJohannes Thumshirn if (btrfs_fs_closing(fs_info)) { 160818bb8bbfSJohannes Thumshirn up_write(&space_info->groups_sem); 160918bb8bbfSJohannes Thumshirn goto next; 161018bb8bbfSJohannes Thumshirn } 161118bb8bbfSJohannes Thumshirn 16125f93e776SJohannes Thumshirn /* 16135f93e776SJohannes Thumshirn * Cache the zone_unusable value before turning the block group 16145f93e776SJohannes Thumshirn * to read only. As soon as the blog group is read only it's 16155f93e776SJohannes Thumshirn * zone_unusable value gets moved to the block group's read-only 16165f93e776SJohannes Thumshirn * bytes and isn't available for calculations anymore. 16175f93e776SJohannes Thumshirn */ 16185f93e776SJohannes Thumshirn zone_unusable = bg->zone_unusable; 161918bb8bbfSJohannes Thumshirn ret = inc_block_group_ro(bg, 0); 162018bb8bbfSJohannes Thumshirn up_write(&space_info->groups_sem); 162118bb8bbfSJohannes Thumshirn if (ret < 0) 162218bb8bbfSJohannes Thumshirn goto next; 162318bb8bbfSJohannes Thumshirn 16245f93e776SJohannes Thumshirn btrfs_info(fs_info, 16255f93e776SJohannes Thumshirn "reclaiming chunk %llu with %llu%% used %llu%% unusable", 16265f93e776SJohannes Thumshirn bg->start, div_u64(bg->used * 100, bg->length), 16275f93e776SJohannes Thumshirn div64_u64(zone_unusable * 100, bg->length)); 162818bb8bbfSJohannes Thumshirn trace_btrfs_reclaim_block_group(bg); 162918bb8bbfSJohannes Thumshirn ret = btrfs_relocate_chunk(fs_info, bg->start); 1630d96b3424SFilipe Manana if (ret) 163118bb8bbfSJohannes Thumshirn btrfs_err(fs_info, "error relocating chunk %llu", 163218bb8bbfSJohannes Thumshirn bg->start); 163318bb8bbfSJohannes Thumshirn 163418bb8bbfSJohannes Thumshirn next: 16351cea5cf0SFilipe Manana btrfs_put_block_group(bg); 1636d96b3424SFilipe Manana spin_lock(&fs_info->unused_bgs_lock); 163718bb8bbfSJohannes Thumshirn } 163818bb8bbfSJohannes Thumshirn spin_unlock(&fs_info->unused_bgs_lock); 163918bb8bbfSJohannes Thumshirn mutex_unlock(&fs_info->reclaim_bgs_lock); 164018bb8bbfSJohannes Thumshirn btrfs_exclop_finish(fs_info); 1641ca5e4ea0SNaohiro Aota sb_end_write(fs_info->sb); 164218bb8bbfSJohannes Thumshirn } 164318bb8bbfSJohannes Thumshirn 164418bb8bbfSJohannes Thumshirn void btrfs_reclaim_bgs(struct btrfs_fs_info *fs_info) 164518bb8bbfSJohannes Thumshirn { 164618bb8bbfSJohannes Thumshirn spin_lock(&fs_info->unused_bgs_lock); 164718bb8bbfSJohannes Thumshirn if (!list_empty(&fs_info->reclaim_bgs)) 164818bb8bbfSJohannes Thumshirn queue_work(system_unbound_wq, &fs_info->reclaim_bgs_work); 164918bb8bbfSJohannes Thumshirn spin_unlock(&fs_info->unused_bgs_lock); 165018bb8bbfSJohannes Thumshirn } 165118bb8bbfSJohannes Thumshirn 165218bb8bbfSJohannes Thumshirn void btrfs_mark_bg_to_reclaim(struct btrfs_block_group *bg) 165318bb8bbfSJohannes Thumshirn { 165418bb8bbfSJohannes Thumshirn struct btrfs_fs_info *fs_info = bg->fs_info; 165518bb8bbfSJohannes Thumshirn 165618bb8bbfSJohannes Thumshirn spin_lock(&fs_info->unused_bgs_lock); 165718bb8bbfSJohannes Thumshirn if (list_empty(&bg->bg_list)) { 165818bb8bbfSJohannes Thumshirn btrfs_get_block_group(bg); 165918bb8bbfSJohannes Thumshirn trace_btrfs_add_reclaim_block_group(bg); 166018bb8bbfSJohannes Thumshirn list_add_tail(&bg->bg_list, &fs_info->reclaim_bgs); 166118bb8bbfSJohannes Thumshirn } 166218bb8bbfSJohannes Thumshirn spin_unlock(&fs_info->unused_bgs_lock); 166318bb8bbfSJohannes Thumshirn } 166418bb8bbfSJohannes Thumshirn 1665e3ba67a1SJohannes Thumshirn static int read_bg_from_eb(struct btrfs_fs_info *fs_info, struct btrfs_key *key, 1666e3ba67a1SJohannes Thumshirn struct btrfs_path *path) 1667e3ba67a1SJohannes Thumshirn { 1668e3ba67a1SJohannes Thumshirn struct extent_map_tree *em_tree; 1669e3ba67a1SJohannes Thumshirn struct extent_map *em; 1670e3ba67a1SJohannes Thumshirn struct btrfs_block_group_item bg; 1671e3ba67a1SJohannes Thumshirn struct extent_buffer *leaf; 1672e3ba67a1SJohannes Thumshirn int slot; 1673e3ba67a1SJohannes Thumshirn u64 flags; 1674e3ba67a1SJohannes Thumshirn int ret = 0; 1675e3ba67a1SJohannes Thumshirn 1676e3ba67a1SJohannes Thumshirn slot = path->slots[0]; 1677e3ba67a1SJohannes Thumshirn leaf = path->nodes[0]; 1678e3ba67a1SJohannes Thumshirn 1679e3ba67a1SJohannes Thumshirn em_tree = &fs_info->mapping_tree; 1680e3ba67a1SJohannes Thumshirn read_lock(&em_tree->lock); 1681e3ba67a1SJohannes Thumshirn em = lookup_extent_mapping(em_tree, key->objectid, key->offset); 1682e3ba67a1SJohannes Thumshirn read_unlock(&em_tree->lock); 1683e3ba67a1SJohannes Thumshirn if (!em) { 1684e3ba67a1SJohannes Thumshirn btrfs_err(fs_info, 1685e3ba67a1SJohannes Thumshirn "logical %llu len %llu found bg but no related chunk", 1686e3ba67a1SJohannes Thumshirn key->objectid, key->offset); 1687e3ba67a1SJohannes Thumshirn return -ENOENT; 1688e3ba67a1SJohannes Thumshirn } 1689e3ba67a1SJohannes Thumshirn 1690e3ba67a1SJohannes Thumshirn if (em->start != key->objectid || em->len != key->offset) { 1691e3ba67a1SJohannes Thumshirn btrfs_err(fs_info, 1692e3ba67a1SJohannes Thumshirn "block group %llu len %llu mismatch with chunk %llu len %llu", 1693e3ba67a1SJohannes Thumshirn key->objectid, key->offset, em->start, em->len); 1694e3ba67a1SJohannes Thumshirn ret = -EUCLEAN; 1695e3ba67a1SJohannes Thumshirn goto out_free_em; 1696e3ba67a1SJohannes Thumshirn } 1697e3ba67a1SJohannes Thumshirn 1698e3ba67a1SJohannes Thumshirn read_extent_buffer(leaf, &bg, btrfs_item_ptr_offset(leaf, slot), 1699e3ba67a1SJohannes Thumshirn sizeof(bg)); 1700e3ba67a1SJohannes Thumshirn flags = btrfs_stack_block_group_flags(&bg) & 1701e3ba67a1SJohannes Thumshirn BTRFS_BLOCK_GROUP_TYPE_MASK; 1702e3ba67a1SJohannes Thumshirn 1703e3ba67a1SJohannes Thumshirn if (flags != (em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK)) { 1704e3ba67a1SJohannes Thumshirn btrfs_err(fs_info, 1705e3ba67a1SJohannes Thumshirn "block group %llu len %llu type flags 0x%llx mismatch with chunk type flags 0x%llx", 1706e3ba67a1SJohannes Thumshirn key->objectid, key->offset, flags, 1707e3ba67a1SJohannes Thumshirn (BTRFS_BLOCK_GROUP_TYPE_MASK & em->map_lookup->type)); 1708e3ba67a1SJohannes Thumshirn ret = -EUCLEAN; 1709e3ba67a1SJohannes Thumshirn } 1710e3ba67a1SJohannes Thumshirn 1711e3ba67a1SJohannes Thumshirn out_free_em: 1712e3ba67a1SJohannes Thumshirn free_extent_map(em); 1713e3ba67a1SJohannes Thumshirn return ret; 1714e3ba67a1SJohannes Thumshirn } 1715e3ba67a1SJohannes Thumshirn 17164358d963SJosef Bacik static int find_first_block_group(struct btrfs_fs_info *fs_info, 17174358d963SJosef Bacik struct btrfs_path *path, 17184358d963SJosef Bacik struct btrfs_key *key) 17194358d963SJosef Bacik { 1720dfe8aec4SJosef Bacik struct btrfs_root *root = btrfs_block_group_root(fs_info); 1721e3ba67a1SJohannes Thumshirn int ret; 17224358d963SJosef Bacik struct btrfs_key found_key; 17234358d963SJosef Bacik 172436dfbbe2SGabriel Niebler btrfs_for_each_slot(root, key, &found_key, path, ret) { 17254358d963SJosef Bacik if (found_key.objectid >= key->objectid && 17264358d963SJosef Bacik found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { 172736dfbbe2SGabriel Niebler return read_bg_from_eb(fs_info, &found_key, path); 1728e3ba67a1SJohannes Thumshirn } 17294358d963SJosef Bacik } 17304358d963SJosef Bacik return ret; 17314358d963SJosef Bacik } 17324358d963SJosef Bacik 17334358d963SJosef Bacik static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) 17344358d963SJosef Bacik { 17354358d963SJosef Bacik u64 extra_flags = chunk_to_extended(flags) & 17364358d963SJosef Bacik BTRFS_EXTENDED_PROFILE_MASK; 17374358d963SJosef Bacik 17384358d963SJosef Bacik write_seqlock(&fs_info->profiles_lock); 17394358d963SJosef Bacik if (flags & BTRFS_BLOCK_GROUP_DATA) 17404358d963SJosef Bacik fs_info->avail_data_alloc_bits |= extra_flags; 17414358d963SJosef Bacik if (flags & BTRFS_BLOCK_GROUP_METADATA) 17424358d963SJosef Bacik fs_info->avail_metadata_alloc_bits |= extra_flags; 17434358d963SJosef Bacik if (flags & BTRFS_BLOCK_GROUP_SYSTEM) 17444358d963SJosef Bacik fs_info->avail_system_alloc_bits |= extra_flags; 17454358d963SJosef Bacik write_sequnlock(&fs_info->profiles_lock); 17464358d963SJosef Bacik } 17474358d963SJosef Bacik 174896a14336SNikolay Borisov /** 17499ee9b979SNikolay Borisov * Map a physical disk address to a list of logical addresses 17509ee9b979SNikolay Borisov * 17519ee9b979SNikolay Borisov * @fs_info: the filesystem 175296a14336SNikolay Borisov * @chunk_start: logical address of block group 1753138082f3SNaohiro Aota * @bdev: physical device to resolve, can be NULL to indicate any device 175496a14336SNikolay Borisov * @physical: physical address to map to logical addresses 175596a14336SNikolay Borisov * @logical: return array of logical addresses which map to @physical 175696a14336SNikolay Borisov * @naddrs: length of @logical 175796a14336SNikolay Borisov * @stripe_len: size of IO stripe for the given block group 175896a14336SNikolay Borisov * 175996a14336SNikolay Borisov * Maps a particular @physical disk address to a list of @logical addresses. 176096a14336SNikolay Borisov * Used primarily to exclude those portions of a block group that contain super 176196a14336SNikolay Borisov * block copies. 176296a14336SNikolay Borisov */ 176396a14336SNikolay Borisov int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start, 1764138082f3SNaohiro Aota struct block_device *bdev, u64 physical, u64 **logical, 1765138082f3SNaohiro Aota int *naddrs, int *stripe_len) 176696a14336SNikolay Borisov { 176796a14336SNikolay Borisov struct extent_map *em; 176896a14336SNikolay Borisov struct map_lookup *map; 176996a14336SNikolay Borisov u64 *buf; 177096a14336SNikolay Borisov u64 bytenr; 17711776ad17SNikolay Borisov u64 data_stripe_length; 17721776ad17SNikolay Borisov u64 io_stripe_size; 17731776ad17SNikolay Borisov int i, nr = 0; 17741776ad17SNikolay Borisov int ret = 0; 177596a14336SNikolay Borisov 177696a14336SNikolay Borisov em = btrfs_get_chunk_map(fs_info, chunk_start, 1); 177796a14336SNikolay Borisov if (IS_ERR(em)) 177896a14336SNikolay Borisov return -EIO; 177996a14336SNikolay Borisov 178096a14336SNikolay Borisov map = em->map_lookup; 17819e22b925SNikolay Borisov data_stripe_length = em->orig_block_len; 17821776ad17SNikolay Borisov io_stripe_size = map->stripe_len; 1783138082f3SNaohiro Aota chunk_start = em->start; 178496a14336SNikolay Borisov 17859e22b925SNikolay Borisov /* For RAID5/6 adjust to a full IO stripe length */ 17869e22b925SNikolay Borisov if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) 17871776ad17SNikolay Borisov io_stripe_size = map->stripe_len * nr_data_stripes(map); 178896a14336SNikolay Borisov 178996a14336SNikolay Borisov buf = kcalloc(map->num_stripes, sizeof(u64), GFP_NOFS); 17901776ad17SNikolay Borisov if (!buf) { 17911776ad17SNikolay Borisov ret = -ENOMEM; 17921776ad17SNikolay Borisov goto out; 17931776ad17SNikolay Borisov } 179496a14336SNikolay Borisov 179596a14336SNikolay Borisov for (i = 0; i < map->num_stripes; i++) { 17961776ad17SNikolay Borisov bool already_inserted = false; 17971776ad17SNikolay Borisov u64 stripe_nr; 1798138082f3SNaohiro Aota u64 offset; 17991776ad17SNikolay Borisov int j; 18001776ad17SNikolay Borisov 18011776ad17SNikolay Borisov if (!in_range(physical, map->stripes[i].physical, 18021776ad17SNikolay Borisov data_stripe_length)) 180396a14336SNikolay Borisov continue; 180496a14336SNikolay Borisov 1805138082f3SNaohiro Aota if (bdev && map->stripes[i].dev->bdev != bdev) 1806138082f3SNaohiro Aota continue; 1807138082f3SNaohiro Aota 180896a14336SNikolay Borisov stripe_nr = physical - map->stripes[i].physical; 1809138082f3SNaohiro Aota stripe_nr = div64_u64_rem(stripe_nr, map->stripe_len, &offset); 181096a14336SNikolay Borisov 181196a14336SNikolay Borisov if (map->type & BTRFS_BLOCK_GROUP_RAID10) { 181296a14336SNikolay Borisov stripe_nr = stripe_nr * map->num_stripes + i; 181396a14336SNikolay Borisov stripe_nr = div_u64(stripe_nr, map->sub_stripes); 181496a14336SNikolay Borisov } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) { 181596a14336SNikolay Borisov stripe_nr = stripe_nr * map->num_stripes + i; 181696a14336SNikolay Borisov } 181796a14336SNikolay Borisov /* 181896a14336SNikolay Borisov * The remaining case would be for RAID56, multiply by 181996a14336SNikolay Borisov * nr_data_stripes(). Alternatively, just use rmap_len below 182096a14336SNikolay Borisov * instead of map->stripe_len 182196a14336SNikolay Borisov */ 182296a14336SNikolay Borisov 1823138082f3SNaohiro Aota bytenr = chunk_start + stripe_nr * io_stripe_size + offset; 18241776ad17SNikolay Borisov 18251776ad17SNikolay Borisov /* Ensure we don't add duplicate addresses */ 182696a14336SNikolay Borisov for (j = 0; j < nr; j++) { 18271776ad17SNikolay Borisov if (buf[j] == bytenr) { 18281776ad17SNikolay Borisov already_inserted = true; 182996a14336SNikolay Borisov break; 183096a14336SNikolay Borisov } 183196a14336SNikolay Borisov } 18321776ad17SNikolay Borisov 18331776ad17SNikolay Borisov if (!already_inserted) 18341776ad17SNikolay Borisov buf[nr++] = bytenr; 183596a14336SNikolay Borisov } 183696a14336SNikolay Borisov 183796a14336SNikolay Borisov *logical = buf; 183896a14336SNikolay Borisov *naddrs = nr; 18391776ad17SNikolay Borisov *stripe_len = io_stripe_size; 18401776ad17SNikolay Borisov out: 184196a14336SNikolay Borisov free_extent_map(em); 18421776ad17SNikolay Borisov return ret; 184396a14336SNikolay Borisov } 184496a14336SNikolay Borisov 184532da5386SDavid Sterba static int exclude_super_stripes(struct btrfs_block_group *cache) 18464358d963SJosef Bacik { 18474358d963SJosef Bacik struct btrfs_fs_info *fs_info = cache->fs_info; 184812659251SNaohiro Aota const bool zoned = btrfs_is_zoned(fs_info); 18494358d963SJosef Bacik u64 bytenr; 18504358d963SJosef Bacik u64 *logical; 18514358d963SJosef Bacik int stripe_len; 18524358d963SJosef Bacik int i, nr, ret; 18534358d963SJosef Bacik 1854b3470b5dSDavid Sterba if (cache->start < BTRFS_SUPER_INFO_OFFSET) { 1855b3470b5dSDavid Sterba stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->start; 18564358d963SJosef Bacik cache->bytes_super += stripe_len; 1857b3470b5dSDavid Sterba ret = btrfs_add_excluded_extent(fs_info, cache->start, 18584358d963SJosef Bacik stripe_len); 18594358d963SJosef Bacik if (ret) 18604358d963SJosef Bacik return ret; 18614358d963SJosef Bacik } 18624358d963SJosef Bacik 18634358d963SJosef Bacik for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { 18644358d963SJosef Bacik bytenr = btrfs_sb_offset(i); 1865138082f3SNaohiro Aota ret = btrfs_rmap_block(fs_info, cache->start, NULL, 18664358d963SJosef Bacik bytenr, &logical, &nr, &stripe_len); 18674358d963SJosef Bacik if (ret) 18684358d963SJosef Bacik return ret; 18694358d963SJosef Bacik 187012659251SNaohiro Aota /* Shouldn't have super stripes in sequential zones */ 187112659251SNaohiro Aota if (zoned && nr) { 187212659251SNaohiro Aota btrfs_err(fs_info, 187312659251SNaohiro Aota "zoned: block group %llu must not contain super block", 187412659251SNaohiro Aota cache->start); 187512659251SNaohiro Aota return -EUCLEAN; 187612659251SNaohiro Aota } 187712659251SNaohiro Aota 18784358d963SJosef Bacik while (nr--) { 187996f9b0f2SNikolay Borisov u64 len = min_t(u64, stripe_len, 188096f9b0f2SNikolay Borisov cache->start + cache->length - logical[nr]); 18814358d963SJosef Bacik 18824358d963SJosef Bacik cache->bytes_super += len; 188396f9b0f2SNikolay Borisov ret = btrfs_add_excluded_extent(fs_info, logical[nr], 188496f9b0f2SNikolay Borisov len); 18854358d963SJosef Bacik if (ret) { 18864358d963SJosef Bacik kfree(logical); 18874358d963SJosef Bacik return ret; 18884358d963SJosef Bacik } 18894358d963SJosef Bacik } 18904358d963SJosef Bacik 18914358d963SJosef Bacik kfree(logical); 18924358d963SJosef Bacik } 18934358d963SJosef Bacik return 0; 18944358d963SJosef Bacik } 18954358d963SJosef Bacik 189632da5386SDavid Sterba static void link_block_group(struct btrfs_block_group *cache) 18974358d963SJosef Bacik { 18984358d963SJosef Bacik struct btrfs_space_info *space_info = cache->space_info; 18994358d963SJosef Bacik int index = btrfs_bg_flags_to_raid_index(cache->flags); 19004358d963SJosef Bacik 19014358d963SJosef Bacik down_write(&space_info->groups_sem); 19024358d963SJosef Bacik list_add_tail(&cache->list, &space_info->block_groups[index]); 19034358d963SJosef Bacik up_write(&space_info->groups_sem); 19044358d963SJosef Bacik } 19054358d963SJosef Bacik 190632da5386SDavid Sterba static struct btrfs_block_group *btrfs_create_block_group_cache( 19079afc6649SQu Wenruo struct btrfs_fs_info *fs_info, u64 start) 19084358d963SJosef Bacik { 190932da5386SDavid Sterba struct btrfs_block_group *cache; 19104358d963SJosef Bacik 19114358d963SJosef Bacik cache = kzalloc(sizeof(*cache), GFP_NOFS); 19124358d963SJosef Bacik if (!cache) 19134358d963SJosef Bacik return NULL; 19144358d963SJosef Bacik 19154358d963SJosef Bacik cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl), 19164358d963SJosef Bacik GFP_NOFS); 19174358d963SJosef Bacik if (!cache->free_space_ctl) { 19184358d963SJosef Bacik kfree(cache); 19194358d963SJosef Bacik return NULL; 19204358d963SJosef Bacik } 19214358d963SJosef Bacik 1922b3470b5dSDavid Sterba cache->start = start; 19234358d963SJosef Bacik 19244358d963SJosef Bacik cache->fs_info = fs_info; 19254358d963SJosef Bacik cache->full_stripe_len = btrfs_full_stripe_len(fs_info, start); 19264358d963SJosef Bacik 19276e80d4f8SDennis Zhou cache->discard_index = BTRFS_DISCARD_INDEX_UNUSED; 19286e80d4f8SDennis Zhou 192948aaeebeSJosef Bacik refcount_set(&cache->refs, 1); 19304358d963SJosef Bacik spin_lock_init(&cache->lock); 19314358d963SJosef Bacik init_rwsem(&cache->data_rwsem); 19324358d963SJosef Bacik INIT_LIST_HEAD(&cache->list); 19334358d963SJosef Bacik INIT_LIST_HEAD(&cache->cluster_list); 19344358d963SJosef Bacik INIT_LIST_HEAD(&cache->bg_list); 19354358d963SJosef Bacik INIT_LIST_HEAD(&cache->ro_list); 1936b0643e59SDennis Zhou INIT_LIST_HEAD(&cache->discard_list); 19374358d963SJosef Bacik INIT_LIST_HEAD(&cache->dirty_list); 19384358d963SJosef Bacik INIT_LIST_HEAD(&cache->io_list); 1939afba2bc0SNaohiro Aota INIT_LIST_HEAD(&cache->active_bg_list); 1940cd79909bSJosef Bacik btrfs_init_free_space_ctl(cache, cache->free_space_ctl); 19416b7304afSFilipe Manana atomic_set(&cache->frozen, 0); 19424358d963SJosef Bacik mutex_init(&cache->free_space_lock); 19434358d963SJosef Bacik btrfs_init_full_stripe_locks_tree(&cache->full_stripe_locks_root); 19444358d963SJosef Bacik 19454358d963SJosef Bacik return cache; 19464358d963SJosef Bacik } 19474358d963SJosef Bacik 19484358d963SJosef Bacik /* 19494358d963SJosef Bacik * Iterate all chunks and verify that each of them has the corresponding block 19504358d963SJosef Bacik * group 19514358d963SJosef Bacik */ 19524358d963SJosef Bacik static int check_chunk_block_group_mappings(struct btrfs_fs_info *fs_info) 19534358d963SJosef Bacik { 19544358d963SJosef Bacik struct extent_map_tree *map_tree = &fs_info->mapping_tree; 19554358d963SJosef Bacik struct extent_map *em; 195632da5386SDavid Sterba struct btrfs_block_group *bg; 19574358d963SJosef Bacik u64 start = 0; 19584358d963SJosef Bacik int ret = 0; 19594358d963SJosef Bacik 19604358d963SJosef Bacik while (1) { 19614358d963SJosef Bacik read_lock(&map_tree->lock); 19624358d963SJosef Bacik /* 19634358d963SJosef Bacik * lookup_extent_mapping will return the first extent map 19644358d963SJosef Bacik * intersecting the range, so setting @len to 1 is enough to 19654358d963SJosef Bacik * get the first chunk. 19664358d963SJosef Bacik */ 19674358d963SJosef Bacik em = lookup_extent_mapping(map_tree, start, 1); 19684358d963SJosef Bacik read_unlock(&map_tree->lock); 19694358d963SJosef Bacik if (!em) 19704358d963SJosef Bacik break; 19714358d963SJosef Bacik 19724358d963SJosef Bacik bg = btrfs_lookup_block_group(fs_info, em->start); 19734358d963SJosef Bacik if (!bg) { 19744358d963SJosef Bacik btrfs_err(fs_info, 19754358d963SJosef Bacik "chunk start=%llu len=%llu doesn't have corresponding block group", 19764358d963SJosef Bacik em->start, em->len); 19774358d963SJosef Bacik ret = -EUCLEAN; 19784358d963SJosef Bacik free_extent_map(em); 19794358d963SJosef Bacik break; 19804358d963SJosef Bacik } 1981b3470b5dSDavid Sterba if (bg->start != em->start || bg->length != em->len || 19824358d963SJosef Bacik (bg->flags & BTRFS_BLOCK_GROUP_TYPE_MASK) != 19834358d963SJosef Bacik (em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK)) { 19844358d963SJosef Bacik btrfs_err(fs_info, 19854358d963SJosef Bacik "chunk start=%llu len=%llu flags=0x%llx doesn't match block group start=%llu len=%llu flags=0x%llx", 19864358d963SJosef Bacik em->start, em->len, 19874358d963SJosef Bacik em->map_lookup->type & BTRFS_BLOCK_GROUP_TYPE_MASK, 1988b3470b5dSDavid Sterba bg->start, bg->length, 19894358d963SJosef Bacik bg->flags & BTRFS_BLOCK_GROUP_TYPE_MASK); 19904358d963SJosef Bacik ret = -EUCLEAN; 19914358d963SJosef Bacik free_extent_map(em); 19924358d963SJosef Bacik btrfs_put_block_group(bg); 19934358d963SJosef Bacik break; 19944358d963SJosef Bacik } 19954358d963SJosef Bacik start = em->start + em->len; 19964358d963SJosef Bacik free_extent_map(em); 19974358d963SJosef Bacik btrfs_put_block_group(bg); 19984358d963SJosef Bacik } 19994358d963SJosef Bacik return ret; 20004358d963SJosef Bacik } 20014358d963SJosef Bacik 2002ffb9e0f0SQu Wenruo static int read_one_block_group(struct btrfs_fs_info *info, 20034afd2fe8SJohannes Thumshirn struct btrfs_block_group_item *bgi, 2004d49a2ddbSQu Wenruo const struct btrfs_key *key, 2005ffb9e0f0SQu Wenruo int need_clear) 2006ffb9e0f0SQu Wenruo { 200732da5386SDavid Sterba struct btrfs_block_group *cache; 2008ffb9e0f0SQu Wenruo struct btrfs_space_info *space_info; 2009ffb9e0f0SQu Wenruo const bool mixed = btrfs_fs_incompat(info, MIXED_GROUPS); 2010ffb9e0f0SQu Wenruo int ret; 2011ffb9e0f0SQu Wenruo 2012d49a2ddbSQu Wenruo ASSERT(key->type == BTRFS_BLOCK_GROUP_ITEM_KEY); 2013ffb9e0f0SQu Wenruo 20149afc6649SQu Wenruo cache = btrfs_create_block_group_cache(info, key->objectid); 2015ffb9e0f0SQu Wenruo if (!cache) 2016ffb9e0f0SQu Wenruo return -ENOMEM; 2017ffb9e0f0SQu Wenruo 20184afd2fe8SJohannes Thumshirn cache->length = key->offset; 20194afd2fe8SJohannes Thumshirn cache->used = btrfs_stack_block_group_used(bgi); 20204afd2fe8SJohannes Thumshirn cache->flags = btrfs_stack_block_group_flags(bgi); 2021f7238e50SJosef Bacik cache->global_root_id = btrfs_stack_block_group_chunk_objectid(bgi); 20229afc6649SQu Wenruo 2023e3e39c72SMarcos Paulo de Souza set_free_space_tree_thresholds(cache); 2024e3e39c72SMarcos Paulo de Souza 2025ffb9e0f0SQu Wenruo if (need_clear) { 2026ffb9e0f0SQu Wenruo /* 2027ffb9e0f0SQu Wenruo * When we mount with old space cache, we need to 2028ffb9e0f0SQu Wenruo * set BTRFS_DC_CLEAR and set dirty flag. 2029ffb9e0f0SQu Wenruo * 2030ffb9e0f0SQu Wenruo * a) Setting 'BTRFS_DC_CLEAR' makes sure that we 2031ffb9e0f0SQu Wenruo * truncate the old free space cache inode and 2032ffb9e0f0SQu Wenruo * setup a new one. 2033ffb9e0f0SQu Wenruo * b) Setting 'dirty flag' makes sure that we flush 2034ffb9e0f0SQu Wenruo * the new space cache info onto disk. 2035ffb9e0f0SQu Wenruo */ 2036ffb9e0f0SQu Wenruo if (btrfs_test_opt(info, SPACE_CACHE)) 2037ffb9e0f0SQu Wenruo cache->disk_cache_state = BTRFS_DC_CLEAR; 2038ffb9e0f0SQu Wenruo } 2039ffb9e0f0SQu Wenruo if (!mixed && ((cache->flags & BTRFS_BLOCK_GROUP_METADATA) && 2040ffb9e0f0SQu Wenruo (cache->flags & BTRFS_BLOCK_GROUP_DATA))) { 2041ffb9e0f0SQu Wenruo btrfs_err(info, 2042ffb9e0f0SQu Wenruo "bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups", 2043ffb9e0f0SQu Wenruo cache->start); 2044ffb9e0f0SQu Wenruo ret = -EINVAL; 2045ffb9e0f0SQu Wenruo goto error; 2046ffb9e0f0SQu Wenruo } 2047ffb9e0f0SQu Wenruo 2048a94794d5SNaohiro Aota ret = btrfs_load_block_group_zone_info(cache, false); 204908e11a3dSNaohiro Aota if (ret) { 205008e11a3dSNaohiro Aota btrfs_err(info, "zoned: failed to load zone info of bg %llu", 205108e11a3dSNaohiro Aota cache->start); 205208e11a3dSNaohiro Aota goto error; 205308e11a3dSNaohiro Aota } 205408e11a3dSNaohiro Aota 2055ffb9e0f0SQu Wenruo /* 2056ffb9e0f0SQu Wenruo * We need to exclude the super stripes now so that the space info has 2057ffb9e0f0SQu Wenruo * super bytes accounted for, otherwise we'll think we have more space 2058ffb9e0f0SQu Wenruo * than we actually do. 2059ffb9e0f0SQu Wenruo */ 2060ffb9e0f0SQu Wenruo ret = exclude_super_stripes(cache); 2061ffb9e0f0SQu Wenruo if (ret) { 2062ffb9e0f0SQu Wenruo /* We may have excluded something, so call this just in case. */ 2063ffb9e0f0SQu Wenruo btrfs_free_excluded_extents(cache); 2064ffb9e0f0SQu Wenruo goto error; 2065ffb9e0f0SQu Wenruo } 2066ffb9e0f0SQu Wenruo 2067ffb9e0f0SQu Wenruo /* 2068169e0da9SNaohiro Aota * For zoned filesystem, space after the allocation offset is the only 2069169e0da9SNaohiro Aota * free space for a block group. So, we don't need any caching work. 2070169e0da9SNaohiro Aota * btrfs_calc_zone_unusable() will set the amount of free space and 2071169e0da9SNaohiro Aota * zone_unusable space. 2072169e0da9SNaohiro Aota * 2073169e0da9SNaohiro Aota * For regular filesystem, check for two cases, either we are full, and 2074169e0da9SNaohiro Aota * therefore don't need to bother with the caching work since we won't 2075169e0da9SNaohiro Aota * find any space, or we are empty, and we can just add all the space 2076169e0da9SNaohiro Aota * in and be done with it. This saves us _a_lot_ of time, particularly 2077169e0da9SNaohiro Aota * in the full case. 2078ffb9e0f0SQu Wenruo */ 2079169e0da9SNaohiro Aota if (btrfs_is_zoned(info)) { 2080169e0da9SNaohiro Aota btrfs_calc_zone_unusable(cache); 2081c46c4247SNaohiro Aota /* Should not have any excluded extents. Just in case, though. */ 2082c46c4247SNaohiro Aota btrfs_free_excluded_extents(cache); 2083169e0da9SNaohiro Aota } else if (cache->length == cache->used) { 2084ffb9e0f0SQu Wenruo cache->last_byte_to_unpin = (u64)-1; 2085ffb9e0f0SQu Wenruo cache->cached = BTRFS_CACHE_FINISHED; 2086ffb9e0f0SQu Wenruo btrfs_free_excluded_extents(cache); 2087ffb9e0f0SQu Wenruo } else if (cache->used == 0) { 2088ffb9e0f0SQu Wenruo cache->last_byte_to_unpin = (u64)-1; 2089ffb9e0f0SQu Wenruo cache->cached = BTRFS_CACHE_FINISHED; 20909afc6649SQu Wenruo add_new_free_space(cache, cache->start, 20919afc6649SQu Wenruo cache->start + cache->length); 2092ffb9e0f0SQu Wenruo btrfs_free_excluded_extents(cache); 2093ffb9e0f0SQu Wenruo } 2094ffb9e0f0SQu Wenruo 2095ffb9e0f0SQu Wenruo ret = btrfs_add_block_group_cache(info, cache); 2096ffb9e0f0SQu Wenruo if (ret) { 2097ffb9e0f0SQu Wenruo btrfs_remove_free_space_cache(cache); 2098ffb9e0f0SQu Wenruo goto error; 2099ffb9e0f0SQu Wenruo } 2100ffb9e0f0SQu Wenruo trace_btrfs_add_block_group(info, cache, 0); 21019afc6649SQu Wenruo btrfs_update_space_info(info, cache->flags, cache->length, 2102169e0da9SNaohiro Aota cache->used, cache->bytes_super, 2103169e0da9SNaohiro Aota cache->zone_unusable, &space_info); 2104ffb9e0f0SQu Wenruo 2105ffb9e0f0SQu Wenruo cache->space_info = space_info; 2106ffb9e0f0SQu Wenruo 2107ffb9e0f0SQu Wenruo link_block_group(cache); 2108ffb9e0f0SQu Wenruo 2109ffb9e0f0SQu Wenruo set_avail_alloc_bits(info, cache->flags); 2110a09f23c3SAnand Jain if (btrfs_chunk_writeable(info, cache->start)) { 2111a09f23c3SAnand Jain if (cache->used == 0) { 2112ffb9e0f0SQu Wenruo ASSERT(list_empty(&cache->bg_list)); 21136e80d4f8SDennis Zhou if (btrfs_test_opt(info, DISCARD_ASYNC)) 21146e80d4f8SDennis Zhou btrfs_discard_queue_work(&info->discard_ctl, cache); 21156e80d4f8SDennis Zhou else 2116ffb9e0f0SQu Wenruo btrfs_mark_bg_unused(cache); 2117ffb9e0f0SQu Wenruo } 2118a09f23c3SAnand Jain } else { 2119a09f23c3SAnand Jain inc_block_group_ro(cache, 1); 2120a09f23c3SAnand Jain } 2121a09f23c3SAnand Jain 2122ffb9e0f0SQu Wenruo return 0; 2123ffb9e0f0SQu Wenruo error: 2124ffb9e0f0SQu Wenruo btrfs_put_block_group(cache); 2125ffb9e0f0SQu Wenruo return ret; 2126ffb9e0f0SQu Wenruo } 2127ffb9e0f0SQu Wenruo 212842437a63SJosef Bacik static int fill_dummy_bgs(struct btrfs_fs_info *fs_info) 212942437a63SJosef Bacik { 213042437a63SJosef Bacik struct extent_map_tree *em_tree = &fs_info->mapping_tree; 213142437a63SJosef Bacik struct btrfs_space_info *space_info; 213242437a63SJosef Bacik struct rb_node *node; 213342437a63SJosef Bacik int ret = 0; 213442437a63SJosef Bacik 213542437a63SJosef Bacik for (node = rb_first_cached(&em_tree->map); node; node = rb_next(node)) { 213642437a63SJosef Bacik struct extent_map *em; 213742437a63SJosef Bacik struct map_lookup *map; 213842437a63SJosef Bacik struct btrfs_block_group *bg; 213942437a63SJosef Bacik 214042437a63SJosef Bacik em = rb_entry(node, struct extent_map, rb_node); 214142437a63SJosef Bacik map = em->map_lookup; 214242437a63SJosef Bacik bg = btrfs_create_block_group_cache(fs_info, em->start); 214342437a63SJosef Bacik if (!bg) { 214442437a63SJosef Bacik ret = -ENOMEM; 214542437a63SJosef Bacik break; 214642437a63SJosef Bacik } 214742437a63SJosef Bacik 214842437a63SJosef Bacik /* Fill dummy cache as FULL */ 214942437a63SJosef Bacik bg->length = em->len; 215042437a63SJosef Bacik bg->flags = map->type; 215142437a63SJosef Bacik bg->last_byte_to_unpin = (u64)-1; 215242437a63SJosef Bacik bg->cached = BTRFS_CACHE_FINISHED; 215342437a63SJosef Bacik bg->used = em->len; 215442437a63SJosef Bacik bg->flags = map->type; 215542437a63SJosef Bacik ret = btrfs_add_block_group_cache(fs_info, bg); 21562b29726cSQu Wenruo /* 21572b29726cSQu Wenruo * We may have some valid block group cache added already, in 21582b29726cSQu Wenruo * that case we skip to the next one. 21592b29726cSQu Wenruo */ 21602b29726cSQu Wenruo if (ret == -EEXIST) { 21612b29726cSQu Wenruo ret = 0; 21622b29726cSQu Wenruo btrfs_put_block_group(bg); 21632b29726cSQu Wenruo continue; 21642b29726cSQu Wenruo } 21652b29726cSQu Wenruo 216642437a63SJosef Bacik if (ret) { 216742437a63SJosef Bacik btrfs_remove_free_space_cache(bg); 216842437a63SJosef Bacik btrfs_put_block_group(bg); 216942437a63SJosef Bacik break; 217042437a63SJosef Bacik } 21712b29726cSQu Wenruo 217242437a63SJosef Bacik btrfs_update_space_info(fs_info, bg->flags, em->len, em->len, 2173169e0da9SNaohiro Aota 0, 0, &space_info); 217442437a63SJosef Bacik bg->space_info = space_info; 217542437a63SJosef Bacik link_block_group(bg); 217642437a63SJosef Bacik 217742437a63SJosef Bacik set_avail_alloc_bits(fs_info, bg->flags); 217842437a63SJosef Bacik } 217942437a63SJosef Bacik if (!ret) 218042437a63SJosef Bacik btrfs_init_global_block_rsv(fs_info); 218142437a63SJosef Bacik return ret; 218242437a63SJosef Bacik } 218342437a63SJosef Bacik 21844358d963SJosef Bacik int btrfs_read_block_groups(struct btrfs_fs_info *info) 21854358d963SJosef Bacik { 2186dfe8aec4SJosef Bacik struct btrfs_root *root = btrfs_block_group_root(info); 21874358d963SJosef Bacik struct btrfs_path *path; 21884358d963SJosef Bacik int ret; 218932da5386SDavid Sterba struct btrfs_block_group *cache; 21904358d963SJosef Bacik struct btrfs_space_info *space_info; 21914358d963SJosef Bacik struct btrfs_key key; 21924358d963SJosef Bacik int need_clear = 0; 21934358d963SJosef Bacik u64 cache_gen; 21944358d963SJosef Bacik 2195dfe8aec4SJosef Bacik if (!root) 219642437a63SJosef Bacik return fill_dummy_bgs(info); 219742437a63SJosef Bacik 21984358d963SJosef Bacik key.objectid = 0; 21994358d963SJosef Bacik key.offset = 0; 22004358d963SJosef Bacik key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 22014358d963SJosef Bacik path = btrfs_alloc_path(); 22024358d963SJosef Bacik if (!path) 22034358d963SJosef Bacik return -ENOMEM; 22044358d963SJosef Bacik 22054358d963SJosef Bacik cache_gen = btrfs_super_cache_generation(info->super_copy); 22064358d963SJosef Bacik if (btrfs_test_opt(info, SPACE_CACHE) && 22074358d963SJosef Bacik btrfs_super_generation(info->super_copy) != cache_gen) 22084358d963SJosef Bacik need_clear = 1; 22094358d963SJosef Bacik if (btrfs_test_opt(info, CLEAR_CACHE)) 22104358d963SJosef Bacik need_clear = 1; 22114358d963SJosef Bacik 22124358d963SJosef Bacik while (1) { 22134afd2fe8SJohannes Thumshirn struct btrfs_block_group_item bgi; 22144afd2fe8SJohannes Thumshirn struct extent_buffer *leaf; 22154afd2fe8SJohannes Thumshirn int slot; 22164afd2fe8SJohannes Thumshirn 22174358d963SJosef Bacik ret = find_first_block_group(info, path, &key); 22184358d963SJosef Bacik if (ret > 0) 22194358d963SJosef Bacik break; 22204358d963SJosef Bacik if (ret != 0) 22214358d963SJosef Bacik goto error; 22224358d963SJosef Bacik 22234afd2fe8SJohannes Thumshirn leaf = path->nodes[0]; 22244afd2fe8SJohannes Thumshirn slot = path->slots[0]; 22254afd2fe8SJohannes Thumshirn 22264afd2fe8SJohannes Thumshirn read_extent_buffer(leaf, &bgi, btrfs_item_ptr_offset(leaf, slot), 22274afd2fe8SJohannes Thumshirn sizeof(bgi)); 22284afd2fe8SJohannes Thumshirn 22294afd2fe8SJohannes Thumshirn btrfs_item_key_to_cpu(leaf, &key, slot); 22304afd2fe8SJohannes Thumshirn btrfs_release_path(path); 22314afd2fe8SJohannes Thumshirn ret = read_one_block_group(info, &bgi, &key, need_clear); 2232ffb9e0f0SQu Wenruo if (ret < 0) 22334358d963SJosef Bacik goto error; 2234ffb9e0f0SQu Wenruo key.objectid += key.offset; 2235ffb9e0f0SQu Wenruo key.offset = 0; 22364358d963SJosef Bacik } 22377837fa88SJosef Bacik btrfs_release_path(path); 22384358d963SJosef Bacik 223972804905SJosef Bacik list_for_each_entry(space_info, &info->space_info, list) { 224049ea112dSJosef Bacik int i; 224149ea112dSJosef Bacik 224249ea112dSJosef Bacik for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 224349ea112dSJosef Bacik if (list_empty(&space_info->block_groups[i])) 224449ea112dSJosef Bacik continue; 224549ea112dSJosef Bacik cache = list_first_entry(&space_info->block_groups[i], 224649ea112dSJosef Bacik struct btrfs_block_group, 224749ea112dSJosef Bacik list); 224849ea112dSJosef Bacik btrfs_sysfs_add_block_group_type(cache); 224949ea112dSJosef Bacik } 225049ea112dSJosef Bacik 22514358d963SJosef Bacik if (!(btrfs_get_alloc_profile(info, space_info->flags) & 22524358d963SJosef Bacik (BTRFS_BLOCK_GROUP_RAID10 | 22534358d963SJosef Bacik BTRFS_BLOCK_GROUP_RAID1_MASK | 22544358d963SJosef Bacik BTRFS_BLOCK_GROUP_RAID56_MASK | 22554358d963SJosef Bacik BTRFS_BLOCK_GROUP_DUP))) 22564358d963SJosef Bacik continue; 22574358d963SJosef Bacik /* 22584358d963SJosef Bacik * Avoid allocating from un-mirrored block group if there are 22594358d963SJosef Bacik * mirrored block groups. 22604358d963SJosef Bacik */ 22614358d963SJosef Bacik list_for_each_entry(cache, 22624358d963SJosef Bacik &space_info->block_groups[BTRFS_RAID_RAID0], 22634358d963SJosef Bacik list) 2264e11c0406SJosef Bacik inc_block_group_ro(cache, 1); 22654358d963SJosef Bacik list_for_each_entry(cache, 22664358d963SJosef Bacik &space_info->block_groups[BTRFS_RAID_SINGLE], 22674358d963SJosef Bacik list) 2268e11c0406SJosef Bacik inc_block_group_ro(cache, 1); 22694358d963SJosef Bacik } 22704358d963SJosef Bacik 22714358d963SJosef Bacik btrfs_init_global_block_rsv(info); 22724358d963SJosef Bacik ret = check_chunk_block_group_mappings(info); 22734358d963SJosef Bacik error: 22744358d963SJosef Bacik btrfs_free_path(path); 22752b29726cSQu Wenruo /* 22762b29726cSQu Wenruo * We've hit some error while reading the extent tree, and have 22772b29726cSQu Wenruo * rescue=ibadroots mount option. 22782b29726cSQu Wenruo * Try to fill the tree using dummy block groups so that the user can 22792b29726cSQu Wenruo * continue to mount and grab their data. 22802b29726cSQu Wenruo */ 22812b29726cSQu Wenruo if (ret && btrfs_test_opt(info, IGNOREBADROOTS)) 22822b29726cSQu Wenruo ret = fill_dummy_bgs(info); 22834358d963SJosef Bacik return ret; 22844358d963SJosef Bacik } 22854358d963SJosef Bacik 228679bd3712SFilipe Manana /* 228779bd3712SFilipe Manana * This function, insert_block_group_item(), belongs to the phase 2 of chunk 228879bd3712SFilipe Manana * allocation. 228979bd3712SFilipe Manana * 229079bd3712SFilipe Manana * See the comment at btrfs_chunk_alloc() for details about the chunk allocation 229179bd3712SFilipe Manana * phases. 229279bd3712SFilipe Manana */ 229397f4728aSQu Wenruo static int insert_block_group_item(struct btrfs_trans_handle *trans, 229497f4728aSQu Wenruo struct btrfs_block_group *block_group) 229597f4728aSQu Wenruo { 229697f4728aSQu Wenruo struct btrfs_fs_info *fs_info = trans->fs_info; 229797f4728aSQu Wenruo struct btrfs_block_group_item bgi; 2298dfe8aec4SJosef Bacik struct btrfs_root *root = btrfs_block_group_root(fs_info); 229997f4728aSQu Wenruo struct btrfs_key key; 230097f4728aSQu Wenruo 230197f4728aSQu Wenruo spin_lock(&block_group->lock); 230297f4728aSQu Wenruo btrfs_set_stack_block_group_used(&bgi, block_group->used); 230397f4728aSQu Wenruo btrfs_set_stack_block_group_chunk_objectid(&bgi, 2304f7238e50SJosef Bacik block_group->global_root_id); 230597f4728aSQu Wenruo btrfs_set_stack_block_group_flags(&bgi, block_group->flags); 230697f4728aSQu Wenruo key.objectid = block_group->start; 230797f4728aSQu Wenruo key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 230897f4728aSQu Wenruo key.offset = block_group->length; 230997f4728aSQu Wenruo spin_unlock(&block_group->lock); 231097f4728aSQu Wenruo 231197f4728aSQu Wenruo return btrfs_insert_item(trans, root, &key, &bgi, sizeof(bgi)); 231297f4728aSQu Wenruo } 231397f4728aSQu Wenruo 23142eadb9e7SNikolay Borisov static int insert_dev_extent(struct btrfs_trans_handle *trans, 23152eadb9e7SNikolay Borisov struct btrfs_device *device, u64 chunk_offset, 23162eadb9e7SNikolay Borisov u64 start, u64 num_bytes) 23172eadb9e7SNikolay Borisov { 23182eadb9e7SNikolay Borisov struct btrfs_fs_info *fs_info = device->fs_info; 23192eadb9e7SNikolay Borisov struct btrfs_root *root = fs_info->dev_root; 23202eadb9e7SNikolay Borisov struct btrfs_path *path; 23212eadb9e7SNikolay Borisov struct btrfs_dev_extent *extent; 23222eadb9e7SNikolay Borisov struct extent_buffer *leaf; 23232eadb9e7SNikolay Borisov struct btrfs_key key; 23242eadb9e7SNikolay Borisov int ret; 23252eadb9e7SNikolay Borisov 23262eadb9e7SNikolay Borisov WARN_ON(!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &device->dev_state)); 23272eadb9e7SNikolay Borisov WARN_ON(test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)); 23282eadb9e7SNikolay Borisov path = btrfs_alloc_path(); 23292eadb9e7SNikolay Borisov if (!path) 23302eadb9e7SNikolay Borisov return -ENOMEM; 23312eadb9e7SNikolay Borisov 23322eadb9e7SNikolay Borisov key.objectid = device->devid; 23332eadb9e7SNikolay Borisov key.type = BTRFS_DEV_EXTENT_KEY; 23342eadb9e7SNikolay Borisov key.offset = start; 23352eadb9e7SNikolay Borisov ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*extent)); 23362eadb9e7SNikolay Borisov if (ret) 23372eadb9e7SNikolay Borisov goto out; 23382eadb9e7SNikolay Borisov 23392eadb9e7SNikolay Borisov leaf = path->nodes[0]; 23402eadb9e7SNikolay Borisov extent = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); 23412eadb9e7SNikolay Borisov btrfs_set_dev_extent_chunk_tree(leaf, extent, BTRFS_CHUNK_TREE_OBJECTID); 23422eadb9e7SNikolay Borisov btrfs_set_dev_extent_chunk_objectid(leaf, extent, 23432eadb9e7SNikolay Borisov BTRFS_FIRST_CHUNK_TREE_OBJECTID); 23442eadb9e7SNikolay Borisov btrfs_set_dev_extent_chunk_offset(leaf, extent, chunk_offset); 23452eadb9e7SNikolay Borisov 23462eadb9e7SNikolay Borisov btrfs_set_dev_extent_length(leaf, extent, num_bytes); 23472eadb9e7SNikolay Borisov btrfs_mark_buffer_dirty(leaf); 23482eadb9e7SNikolay Borisov out: 23492eadb9e7SNikolay Borisov btrfs_free_path(path); 23502eadb9e7SNikolay Borisov return ret; 23512eadb9e7SNikolay Borisov } 23522eadb9e7SNikolay Borisov 23532eadb9e7SNikolay Borisov /* 23542eadb9e7SNikolay Borisov * This function belongs to phase 2. 23552eadb9e7SNikolay Borisov * 23562eadb9e7SNikolay Borisov * See the comment at btrfs_chunk_alloc() for details about the chunk allocation 23572eadb9e7SNikolay Borisov * phases. 23582eadb9e7SNikolay Borisov */ 23592eadb9e7SNikolay Borisov static int insert_dev_extents(struct btrfs_trans_handle *trans, 23602eadb9e7SNikolay Borisov u64 chunk_offset, u64 chunk_size) 23612eadb9e7SNikolay Borisov { 23622eadb9e7SNikolay Borisov struct btrfs_fs_info *fs_info = trans->fs_info; 23632eadb9e7SNikolay Borisov struct btrfs_device *device; 23642eadb9e7SNikolay Borisov struct extent_map *em; 23652eadb9e7SNikolay Borisov struct map_lookup *map; 23662eadb9e7SNikolay Borisov u64 dev_offset; 23672eadb9e7SNikolay Borisov u64 stripe_size; 23682eadb9e7SNikolay Borisov int i; 23692eadb9e7SNikolay Borisov int ret = 0; 23702eadb9e7SNikolay Borisov 23712eadb9e7SNikolay Borisov em = btrfs_get_chunk_map(fs_info, chunk_offset, chunk_size); 23722eadb9e7SNikolay Borisov if (IS_ERR(em)) 23732eadb9e7SNikolay Borisov return PTR_ERR(em); 23742eadb9e7SNikolay Borisov 23752eadb9e7SNikolay Borisov map = em->map_lookup; 23762eadb9e7SNikolay Borisov stripe_size = em->orig_block_len; 23772eadb9e7SNikolay Borisov 23782eadb9e7SNikolay Borisov /* 23792eadb9e7SNikolay Borisov * Take the device list mutex to prevent races with the final phase of 23802eadb9e7SNikolay Borisov * a device replace operation that replaces the device object associated 23812eadb9e7SNikolay Borisov * with the map's stripes, because the device object's id can change 23822eadb9e7SNikolay Borisov * at any time during that final phase of the device replace operation 23832eadb9e7SNikolay Borisov * (dev-replace.c:btrfs_dev_replace_finishing()), so we could grab the 23842eadb9e7SNikolay Borisov * replaced device and then see it with an ID of BTRFS_DEV_REPLACE_DEVID, 23852eadb9e7SNikolay Borisov * resulting in persisting a device extent item with such ID. 23862eadb9e7SNikolay Borisov */ 23872eadb9e7SNikolay Borisov mutex_lock(&fs_info->fs_devices->device_list_mutex); 23882eadb9e7SNikolay Borisov for (i = 0; i < map->num_stripes; i++) { 23892eadb9e7SNikolay Borisov device = map->stripes[i].dev; 23902eadb9e7SNikolay Borisov dev_offset = map->stripes[i].physical; 23912eadb9e7SNikolay Borisov 23922eadb9e7SNikolay Borisov ret = insert_dev_extent(trans, device, chunk_offset, dev_offset, 23932eadb9e7SNikolay Borisov stripe_size); 23942eadb9e7SNikolay Borisov if (ret) 23952eadb9e7SNikolay Borisov break; 23962eadb9e7SNikolay Borisov } 23972eadb9e7SNikolay Borisov mutex_unlock(&fs_info->fs_devices->device_list_mutex); 23982eadb9e7SNikolay Borisov 23992eadb9e7SNikolay Borisov free_extent_map(em); 24002eadb9e7SNikolay Borisov return ret; 24012eadb9e7SNikolay Borisov } 24022eadb9e7SNikolay Borisov 240379bd3712SFilipe Manana /* 240479bd3712SFilipe Manana * This function, btrfs_create_pending_block_groups(), belongs to the phase 2 of 240579bd3712SFilipe Manana * chunk allocation. 240679bd3712SFilipe Manana * 240779bd3712SFilipe Manana * See the comment at btrfs_chunk_alloc() for details about the chunk allocation 240879bd3712SFilipe Manana * phases. 240979bd3712SFilipe Manana */ 24104358d963SJosef Bacik void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans) 24114358d963SJosef Bacik { 24124358d963SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 241332da5386SDavid Sterba struct btrfs_block_group *block_group; 24144358d963SJosef Bacik int ret = 0; 24154358d963SJosef Bacik 24164358d963SJosef Bacik while (!list_empty(&trans->new_bgs)) { 241749ea112dSJosef Bacik int index; 241849ea112dSJosef Bacik 24194358d963SJosef Bacik block_group = list_first_entry(&trans->new_bgs, 242032da5386SDavid Sterba struct btrfs_block_group, 24214358d963SJosef Bacik bg_list); 24224358d963SJosef Bacik if (ret) 24234358d963SJosef Bacik goto next; 24244358d963SJosef Bacik 242549ea112dSJosef Bacik index = btrfs_bg_flags_to_raid_index(block_group->flags); 242649ea112dSJosef Bacik 242797f4728aSQu Wenruo ret = insert_block_group_item(trans, block_group); 24284358d963SJosef Bacik if (ret) 24294358d963SJosef Bacik btrfs_abort_transaction(trans, ret); 243079bd3712SFilipe Manana if (!block_group->chunk_item_inserted) { 243179bd3712SFilipe Manana mutex_lock(&fs_info->chunk_mutex); 243279bd3712SFilipe Manana ret = btrfs_chunk_alloc_add_chunk_item(trans, block_group); 243379bd3712SFilipe Manana mutex_unlock(&fs_info->chunk_mutex); 243479bd3712SFilipe Manana if (ret) 243579bd3712SFilipe Manana btrfs_abort_transaction(trans, ret); 243679bd3712SFilipe Manana } 24372eadb9e7SNikolay Borisov ret = insert_dev_extents(trans, block_group->start, 243897f4728aSQu Wenruo block_group->length); 24394358d963SJosef Bacik if (ret) 24404358d963SJosef Bacik btrfs_abort_transaction(trans, ret); 24414358d963SJosef Bacik add_block_group_free_space(trans, block_group); 244249ea112dSJosef Bacik 244349ea112dSJosef Bacik /* 244449ea112dSJosef Bacik * If we restriped during balance, we may have added a new raid 244549ea112dSJosef Bacik * type, so now add the sysfs entries when it is safe to do so. 244649ea112dSJosef Bacik * We don't have to worry about locking here as it's handled in 244749ea112dSJosef Bacik * btrfs_sysfs_add_block_group_type. 244849ea112dSJosef Bacik */ 244949ea112dSJosef Bacik if (block_group->space_info->block_group_kobjs[index] == NULL) 245049ea112dSJosef Bacik btrfs_sysfs_add_block_group_type(block_group); 245149ea112dSJosef Bacik 24524358d963SJosef Bacik /* Already aborted the transaction if it failed. */ 24534358d963SJosef Bacik next: 24544358d963SJosef Bacik btrfs_delayed_refs_rsv_release(fs_info, 1); 24554358d963SJosef Bacik list_del_init(&block_group->bg_list); 24564358d963SJosef Bacik } 24574358d963SJosef Bacik btrfs_trans_release_chunk_metadata(trans); 24584358d963SJosef Bacik } 24594358d963SJosef Bacik 2460f7238e50SJosef Bacik /* 2461f7238e50SJosef Bacik * For extent tree v2 we use the block_group_item->chunk_offset to point at our 2462f7238e50SJosef Bacik * global root id. For v1 it's always set to BTRFS_FIRST_CHUNK_TREE_OBJECTID. 2463f7238e50SJosef Bacik */ 2464f7238e50SJosef Bacik static u64 calculate_global_root_id(struct btrfs_fs_info *fs_info, u64 offset) 2465f7238e50SJosef Bacik { 2466f7238e50SJosef Bacik u64 div = SZ_1G; 2467f7238e50SJosef Bacik u64 index; 2468f7238e50SJosef Bacik 2469f7238e50SJosef Bacik if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) 2470f7238e50SJosef Bacik return BTRFS_FIRST_CHUNK_TREE_OBJECTID; 2471f7238e50SJosef Bacik 2472f7238e50SJosef Bacik /* If we have a smaller fs index based on 128MiB. */ 2473f7238e50SJosef Bacik if (btrfs_super_total_bytes(fs_info->super_copy) <= (SZ_1G * 10ULL)) 2474f7238e50SJosef Bacik div = SZ_128M; 2475f7238e50SJosef Bacik 2476f7238e50SJosef Bacik offset = div64_u64(offset, div); 2477f7238e50SJosef Bacik div64_u64_rem(offset, fs_info->nr_global_roots, &index); 2478f7238e50SJosef Bacik return index; 2479f7238e50SJosef Bacik } 2480f7238e50SJosef Bacik 248179bd3712SFilipe Manana struct btrfs_block_group *btrfs_make_block_group(struct btrfs_trans_handle *trans, 248279bd3712SFilipe Manana u64 bytes_used, u64 type, 248379bd3712SFilipe Manana u64 chunk_offset, u64 size) 24844358d963SJosef Bacik { 24854358d963SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 248632da5386SDavid Sterba struct btrfs_block_group *cache; 24874358d963SJosef Bacik int ret; 24884358d963SJosef Bacik 24894358d963SJosef Bacik btrfs_set_log_full_commit(trans); 24904358d963SJosef Bacik 24919afc6649SQu Wenruo cache = btrfs_create_block_group_cache(fs_info, chunk_offset); 24924358d963SJosef Bacik if (!cache) 249379bd3712SFilipe Manana return ERR_PTR(-ENOMEM); 24944358d963SJosef Bacik 24959afc6649SQu Wenruo cache->length = size; 2496e3e39c72SMarcos Paulo de Souza set_free_space_tree_thresholds(cache); 2497bf38be65SDavid Sterba cache->used = bytes_used; 24984358d963SJosef Bacik cache->flags = type; 24994358d963SJosef Bacik cache->last_byte_to_unpin = (u64)-1; 25004358d963SJosef Bacik cache->cached = BTRFS_CACHE_FINISHED; 2501f7238e50SJosef Bacik cache->global_root_id = calculate_global_root_id(fs_info, cache->start); 2502f7238e50SJosef Bacik 2503997e3e2eSBoris Burkov if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) 25044358d963SJosef Bacik cache->needs_free_space = 1; 250508e11a3dSNaohiro Aota 2506a94794d5SNaohiro Aota ret = btrfs_load_block_group_zone_info(cache, true); 250708e11a3dSNaohiro Aota if (ret) { 250808e11a3dSNaohiro Aota btrfs_put_block_group(cache); 250979bd3712SFilipe Manana return ERR_PTR(ret); 251008e11a3dSNaohiro Aota } 251108e11a3dSNaohiro Aota 25124358d963SJosef Bacik ret = exclude_super_stripes(cache); 25134358d963SJosef Bacik if (ret) { 25144358d963SJosef Bacik /* We may have excluded something, so call this just in case */ 25154358d963SJosef Bacik btrfs_free_excluded_extents(cache); 25164358d963SJosef Bacik btrfs_put_block_group(cache); 251779bd3712SFilipe Manana return ERR_PTR(ret); 25184358d963SJosef Bacik } 25194358d963SJosef Bacik 25204358d963SJosef Bacik add_new_free_space(cache, chunk_offset, chunk_offset + size); 25214358d963SJosef Bacik 25224358d963SJosef Bacik btrfs_free_excluded_extents(cache); 25234358d963SJosef Bacik 25244358d963SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 25254358d963SJosef Bacik if (btrfs_should_fragment_free_space(cache)) { 25264358d963SJosef Bacik u64 new_bytes_used = size - bytes_used; 25274358d963SJosef Bacik 25284358d963SJosef Bacik bytes_used += new_bytes_used >> 1; 2529e11c0406SJosef Bacik fragment_free_space(cache); 25304358d963SJosef Bacik } 25314358d963SJosef Bacik #endif 25324358d963SJosef Bacik /* 25334358d963SJosef Bacik * Ensure the corresponding space_info object is created and 25344358d963SJosef Bacik * assigned to our block group. We want our bg to be added to the rbtree 25354358d963SJosef Bacik * with its ->space_info set. 25364358d963SJosef Bacik */ 25374358d963SJosef Bacik cache->space_info = btrfs_find_space_info(fs_info, cache->flags); 25384358d963SJosef Bacik ASSERT(cache->space_info); 25394358d963SJosef Bacik 25404358d963SJosef Bacik ret = btrfs_add_block_group_cache(fs_info, cache); 25414358d963SJosef Bacik if (ret) { 25424358d963SJosef Bacik btrfs_remove_free_space_cache(cache); 25434358d963SJosef Bacik btrfs_put_block_group(cache); 254479bd3712SFilipe Manana return ERR_PTR(ret); 25454358d963SJosef Bacik } 25464358d963SJosef Bacik 25474358d963SJosef Bacik /* 25484358d963SJosef Bacik * Now that our block group has its ->space_info set and is inserted in 25494358d963SJosef Bacik * the rbtree, update the space info's counters. 25504358d963SJosef Bacik */ 25514358d963SJosef Bacik trace_btrfs_add_block_group(fs_info, cache, 1); 25524358d963SJosef Bacik btrfs_update_space_info(fs_info, cache->flags, size, bytes_used, 255398173255SNaohiro Aota cache->bytes_super, cache->zone_unusable, 255498173255SNaohiro Aota &cache->space_info); 25554358d963SJosef Bacik btrfs_update_global_block_rsv(fs_info); 25564358d963SJosef Bacik 25574358d963SJosef Bacik link_block_group(cache); 25584358d963SJosef Bacik 25594358d963SJosef Bacik list_add_tail(&cache->bg_list, &trans->new_bgs); 25604358d963SJosef Bacik trans->delayed_ref_updates++; 25614358d963SJosef Bacik btrfs_update_delayed_refs_rsv(trans); 25624358d963SJosef Bacik 25634358d963SJosef Bacik set_avail_alloc_bits(fs_info, type); 256479bd3712SFilipe Manana return cache; 25654358d963SJosef Bacik } 256626ce2095SJosef Bacik 2567b12de528SQu Wenruo /* 2568b12de528SQu Wenruo * Mark one block group RO, can be called several times for the same block 2569b12de528SQu Wenruo * group. 2570b12de528SQu Wenruo * 2571b12de528SQu Wenruo * @cache: the destination block group 2572b12de528SQu Wenruo * @do_chunk_alloc: whether need to do chunk pre-allocation, this is to 2573b12de528SQu Wenruo * ensure we still have some free space after marking this 2574b12de528SQu Wenruo * block group RO. 2575b12de528SQu Wenruo */ 2576b12de528SQu Wenruo int btrfs_inc_block_group_ro(struct btrfs_block_group *cache, 2577b12de528SQu Wenruo bool do_chunk_alloc) 257826ce2095SJosef Bacik { 257926ce2095SJosef Bacik struct btrfs_fs_info *fs_info = cache->fs_info; 258026ce2095SJosef Bacik struct btrfs_trans_handle *trans; 2581dfe8aec4SJosef Bacik struct btrfs_root *root = btrfs_block_group_root(fs_info); 258226ce2095SJosef Bacik u64 alloc_flags; 258326ce2095SJosef Bacik int ret; 2584b6e9f16cSNikolay Borisov bool dirty_bg_running; 258526ce2095SJosef Bacik 25862d192fc4SQu Wenruo /* 25872d192fc4SQu Wenruo * This can only happen when we are doing read-only scrub on read-only 25882d192fc4SQu Wenruo * mount. 25892d192fc4SQu Wenruo * In that case we should not start a new transaction on read-only fs. 25902d192fc4SQu Wenruo * Thus here we skip all chunk allocations. 25912d192fc4SQu Wenruo */ 25922d192fc4SQu Wenruo if (sb_rdonly(fs_info->sb)) { 25932d192fc4SQu Wenruo mutex_lock(&fs_info->ro_block_group_mutex); 25942d192fc4SQu Wenruo ret = inc_block_group_ro(cache, 0); 25952d192fc4SQu Wenruo mutex_unlock(&fs_info->ro_block_group_mutex); 25962d192fc4SQu Wenruo return ret; 25972d192fc4SQu Wenruo } 25982d192fc4SQu Wenruo 2599b6e9f16cSNikolay Borisov do { 2600dfe8aec4SJosef Bacik trans = btrfs_join_transaction(root); 260126ce2095SJosef Bacik if (IS_ERR(trans)) 260226ce2095SJosef Bacik return PTR_ERR(trans); 260326ce2095SJosef Bacik 2604b6e9f16cSNikolay Borisov dirty_bg_running = false; 2605b6e9f16cSNikolay Borisov 260626ce2095SJosef Bacik /* 2607b6e9f16cSNikolay Borisov * We're not allowed to set block groups readonly after the dirty 2608b6e9f16cSNikolay Borisov * block group cache has started writing. If it already started, 2609b6e9f16cSNikolay Borisov * back off and let this transaction commit. 261026ce2095SJosef Bacik */ 261126ce2095SJosef Bacik mutex_lock(&fs_info->ro_block_group_mutex); 261226ce2095SJosef Bacik if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags)) { 261326ce2095SJosef Bacik u64 transid = trans->transid; 261426ce2095SJosef Bacik 261526ce2095SJosef Bacik mutex_unlock(&fs_info->ro_block_group_mutex); 261626ce2095SJosef Bacik btrfs_end_transaction(trans); 261726ce2095SJosef Bacik 261826ce2095SJosef Bacik ret = btrfs_wait_for_commit(fs_info, transid); 261926ce2095SJosef Bacik if (ret) 262026ce2095SJosef Bacik return ret; 2621b6e9f16cSNikolay Borisov dirty_bg_running = true; 262226ce2095SJosef Bacik } 2623b6e9f16cSNikolay Borisov } while (dirty_bg_running); 262426ce2095SJosef Bacik 2625b12de528SQu Wenruo if (do_chunk_alloc) { 262626ce2095SJosef Bacik /* 2627b12de528SQu Wenruo * If we are changing raid levels, try to allocate a 2628b12de528SQu Wenruo * corresponding block group with the new raid level. 262926ce2095SJosef Bacik */ 2630349e120eSJosef Bacik alloc_flags = btrfs_get_alloc_profile(fs_info, cache->flags); 263126ce2095SJosef Bacik if (alloc_flags != cache->flags) { 2632b12de528SQu Wenruo ret = btrfs_chunk_alloc(trans, alloc_flags, 2633b12de528SQu Wenruo CHUNK_ALLOC_FORCE); 263426ce2095SJosef Bacik /* 263526ce2095SJosef Bacik * ENOSPC is allowed here, we may have enough space 2636b12de528SQu Wenruo * already allocated at the new raid level to carry on 263726ce2095SJosef Bacik */ 263826ce2095SJosef Bacik if (ret == -ENOSPC) 263926ce2095SJosef Bacik ret = 0; 264026ce2095SJosef Bacik if (ret < 0) 264126ce2095SJosef Bacik goto out; 264226ce2095SJosef Bacik } 2643b12de528SQu Wenruo } 264426ce2095SJosef Bacik 2645a7a63accSJosef Bacik ret = inc_block_group_ro(cache, 0); 2646195a49eaSFilipe Manana if (!do_chunk_alloc || ret == -ETXTBSY) 2647b12de528SQu Wenruo goto unlock_out; 264826ce2095SJosef Bacik if (!ret) 264926ce2095SJosef Bacik goto out; 265026ce2095SJosef Bacik alloc_flags = btrfs_get_alloc_profile(fs_info, cache->space_info->flags); 265126ce2095SJosef Bacik ret = btrfs_chunk_alloc(trans, alloc_flags, CHUNK_ALLOC_FORCE); 265226ce2095SJosef Bacik if (ret < 0) 265326ce2095SJosef Bacik goto out; 2654e11c0406SJosef Bacik ret = inc_block_group_ro(cache, 0); 2655195a49eaSFilipe Manana if (ret == -ETXTBSY) 2656195a49eaSFilipe Manana goto unlock_out; 265726ce2095SJosef Bacik out: 265826ce2095SJosef Bacik if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) { 2659349e120eSJosef Bacik alloc_flags = btrfs_get_alloc_profile(fs_info, cache->flags); 266026ce2095SJosef Bacik mutex_lock(&fs_info->chunk_mutex); 266126ce2095SJosef Bacik check_system_chunk(trans, alloc_flags); 266226ce2095SJosef Bacik mutex_unlock(&fs_info->chunk_mutex); 266326ce2095SJosef Bacik } 2664b12de528SQu Wenruo unlock_out: 266526ce2095SJosef Bacik mutex_unlock(&fs_info->ro_block_group_mutex); 266626ce2095SJosef Bacik 266726ce2095SJosef Bacik btrfs_end_transaction(trans); 266826ce2095SJosef Bacik return ret; 266926ce2095SJosef Bacik } 267026ce2095SJosef Bacik 267132da5386SDavid Sterba void btrfs_dec_block_group_ro(struct btrfs_block_group *cache) 267226ce2095SJosef Bacik { 267326ce2095SJosef Bacik struct btrfs_space_info *sinfo = cache->space_info; 267426ce2095SJosef Bacik u64 num_bytes; 267526ce2095SJosef Bacik 267626ce2095SJosef Bacik BUG_ON(!cache->ro); 267726ce2095SJosef Bacik 267826ce2095SJosef Bacik spin_lock(&sinfo->lock); 267926ce2095SJosef Bacik spin_lock(&cache->lock); 268026ce2095SJosef Bacik if (!--cache->ro) { 2681169e0da9SNaohiro Aota if (btrfs_is_zoned(cache->fs_info)) { 2682169e0da9SNaohiro Aota /* Migrate zone_unusable bytes back */ 268398173255SNaohiro Aota cache->zone_unusable = 268498173255SNaohiro Aota (cache->alloc_offset - cache->used) + 268598173255SNaohiro Aota (cache->length - cache->zone_capacity); 2686169e0da9SNaohiro Aota sinfo->bytes_zone_unusable += cache->zone_unusable; 2687169e0da9SNaohiro Aota sinfo->bytes_readonly -= cache->zone_unusable; 2688169e0da9SNaohiro Aota } 2689f9f28e5bSNaohiro Aota num_bytes = cache->length - cache->reserved - 2690f9f28e5bSNaohiro Aota cache->pinned - cache->bytes_super - 2691f9f28e5bSNaohiro Aota cache->zone_unusable - cache->used; 2692f9f28e5bSNaohiro Aota sinfo->bytes_readonly -= num_bytes; 269326ce2095SJosef Bacik list_del_init(&cache->ro_list); 269426ce2095SJosef Bacik } 269526ce2095SJosef Bacik spin_unlock(&cache->lock); 269626ce2095SJosef Bacik spin_unlock(&sinfo->lock); 269726ce2095SJosef Bacik } 269877745c05SJosef Bacik 26993be4d8efSQu Wenruo static int update_block_group_item(struct btrfs_trans_handle *trans, 270077745c05SJosef Bacik struct btrfs_path *path, 270132da5386SDavid Sterba struct btrfs_block_group *cache) 270277745c05SJosef Bacik { 270377745c05SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 270477745c05SJosef Bacik int ret; 2705dfe8aec4SJosef Bacik struct btrfs_root *root = btrfs_block_group_root(fs_info); 270677745c05SJosef Bacik unsigned long bi; 270777745c05SJosef Bacik struct extent_buffer *leaf; 2708bf38be65SDavid Sterba struct btrfs_block_group_item bgi; 2709b3470b5dSDavid Sterba struct btrfs_key key; 271077745c05SJosef Bacik 2711b3470b5dSDavid Sterba key.objectid = cache->start; 2712b3470b5dSDavid Sterba key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; 2713b3470b5dSDavid Sterba key.offset = cache->length; 2714b3470b5dSDavid Sterba 27153be4d8efSQu Wenruo ret = btrfs_search_slot(trans, root, &key, path, 0, 1); 271677745c05SJosef Bacik if (ret) { 271777745c05SJosef Bacik if (ret > 0) 271877745c05SJosef Bacik ret = -ENOENT; 271977745c05SJosef Bacik goto fail; 272077745c05SJosef Bacik } 272177745c05SJosef Bacik 272277745c05SJosef Bacik leaf = path->nodes[0]; 272377745c05SJosef Bacik bi = btrfs_item_ptr_offset(leaf, path->slots[0]); 2724de0dc456SDavid Sterba btrfs_set_stack_block_group_used(&bgi, cache->used); 2725de0dc456SDavid Sterba btrfs_set_stack_block_group_chunk_objectid(&bgi, 2726f7238e50SJosef Bacik cache->global_root_id); 2727de0dc456SDavid Sterba btrfs_set_stack_block_group_flags(&bgi, cache->flags); 2728bf38be65SDavid Sterba write_extent_buffer(leaf, &bgi, bi, sizeof(bgi)); 272977745c05SJosef Bacik btrfs_mark_buffer_dirty(leaf); 273077745c05SJosef Bacik fail: 273177745c05SJosef Bacik btrfs_release_path(path); 273277745c05SJosef Bacik return ret; 273377745c05SJosef Bacik 273477745c05SJosef Bacik } 273577745c05SJosef Bacik 273632da5386SDavid Sterba static int cache_save_setup(struct btrfs_block_group *block_group, 273777745c05SJosef Bacik struct btrfs_trans_handle *trans, 273877745c05SJosef Bacik struct btrfs_path *path) 273977745c05SJosef Bacik { 274077745c05SJosef Bacik struct btrfs_fs_info *fs_info = block_group->fs_info; 274177745c05SJosef Bacik struct btrfs_root *root = fs_info->tree_root; 274277745c05SJosef Bacik struct inode *inode = NULL; 274377745c05SJosef Bacik struct extent_changeset *data_reserved = NULL; 274477745c05SJosef Bacik u64 alloc_hint = 0; 274577745c05SJosef Bacik int dcs = BTRFS_DC_ERROR; 27460044ae11SQu Wenruo u64 cache_size = 0; 274777745c05SJosef Bacik int retries = 0; 274877745c05SJosef Bacik int ret = 0; 274977745c05SJosef Bacik 2750af456a2cSBoris Burkov if (!btrfs_test_opt(fs_info, SPACE_CACHE)) 2751af456a2cSBoris Burkov return 0; 2752af456a2cSBoris Burkov 275377745c05SJosef Bacik /* 275477745c05SJosef Bacik * If this block group is smaller than 100 megs don't bother caching the 275577745c05SJosef Bacik * block group. 275677745c05SJosef Bacik */ 2757b3470b5dSDavid Sterba if (block_group->length < (100 * SZ_1M)) { 275877745c05SJosef Bacik spin_lock(&block_group->lock); 275977745c05SJosef Bacik block_group->disk_cache_state = BTRFS_DC_WRITTEN; 276077745c05SJosef Bacik spin_unlock(&block_group->lock); 276177745c05SJosef Bacik return 0; 276277745c05SJosef Bacik } 276377745c05SJosef Bacik 2764bf31f87fSDavid Sterba if (TRANS_ABORTED(trans)) 276577745c05SJosef Bacik return 0; 276677745c05SJosef Bacik again: 276777745c05SJosef Bacik inode = lookup_free_space_inode(block_group, path); 276877745c05SJosef Bacik if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) { 276977745c05SJosef Bacik ret = PTR_ERR(inode); 277077745c05SJosef Bacik btrfs_release_path(path); 277177745c05SJosef Bacik goto out; 277277745c05SJosef Bacik } 277377745c05SJosef Bacik 277477745c05SJosef Bacik if (IS_ERR(inode)) { 277577745c05SJosef Bacik BUG_ON(retries); 277677745c05SJosef Bacik retries++; 277777745c05SJosef Bacik 277877745c05SJosef Bacik if (block_group->ro) 277977745c05SJosef Bacik goto out_free; 278077745c05SJosef Bacik 278177745c05SJosef Bacik ret = create_free_space_inode(trans, block_group, path); 278277745c05SJosef Bacik if (ret) 278377745c05SJosef Bacik goto out_free; 278477745c05SJosef Bacik goto again; 278577745c05SJosef Bacik } 278677745c05SJosef Bacik 278777745c05SJosef Bacik /* 278877745c05SJosef Bacik * We want to set the generation to 0, that way if anything goes wrong 278977745c05SJosef Bacik * from here on out we know not to trust this cache when we load up next 279077745c05SJosef Bacik * time. 279177745c05SJosef Bacik */ 279277745c05SJosef Bacik BTRFS_I(inode)->generation = 0; 27939a56fcd1SNikolay Borisov ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 279477745c05SJosef Bacik if (ret) { 279577745c05SJosef Bacik /* 279677745c05SJosef Bacik * So theoretically we could recover from this, simply set the 279777745c05SJosef Bacik * super cache generation to 0 so we know to invalidate the 279877745c05SJosef Bacik * cache, but then we'd have to keep track of the block groups 279977745c05SJosef Bacik * that fail this way so we know we _have_ to reset this cache 280077745c05SJosef Bacik * before the next commit or risk reading stale cache. So to 280177745c05SJosef Bacik * limit our exposure to horrible edge cases lets just abort the 280277745c05SJosef Bacik * transaction, this only happens in really bad situations 280377745c05SJosef Bacik * anyway. 280477745c05SJosef Bacik */ 280577745c05SJosef Bacik btrfs_abort_transaction(trans, ret); 280677745c05SJosef Bacik goto out_put; 280777745c05SJosef Bacik } 280877745c05SJosef Bacik WARN_ON(ret); 280977745c05SJosef Bacik 281077745c05SJosef Bacik /* We've already setup this transaction, go ahead and exit */ 281177745c05SJosef Bacik if (block_group->cache_generation == trans->transid && 281277745c05SJosef Bacik i_size_read(inode)) { 281377745c05SJosef Bacik dcs = BTRFS_DC_SETUP; 281477745c05SJosef Bacik goto out_put; 281577745c05SJosef Bacik } 281677745c05SJosef Bacik 281777745c05SJosef Bacik if (i_size_read(inode) > 0) { 281877745c05SJosef Bacik ret = btrfs_check_trunc_cache_free_space(fs_info, 281977745c05SJosef Bacik &fs_info->global_block_rsv); 282077745c05SJosef Bacik if (ret) 282177745c05SJosef Bacik goto out_put; 282277745c05SJosef Bacik 282377745c05SJosef Bacik ret = btrfs_truncate_free_space_cache(trans, NULL, inode); 282477745c05SJosef Bacik if (ret) 282577745c05SJosef Bacik goto out_put; 282677745c05SJosef Bacik } 282777745c05SJosef Bacik 282877745c05SJosef Bacik spin_lock(&block_group->lock); 282977745c05SJosef Bacik if (block_group->cached != BTRFS_CACHE_FINISHED || 283077745c05SJosef Bacik !btrfs_test_opt(fs_info, SPACE_CACHE)) { 283177745c05SJosef Bacik /* 283277745c05SJosef Bacik * don't bother trying to write stuff out _if_ 283377745c05SJosef Bacik * a) we're not cached, 283477745c05SJosef Bacik * b) we're with nospace_cache mount option, 283577745c05SJosef Bacik * c) we're with v2 space_cache (FREE_SPACE_TREE). 283677745c05SJosef Bacik */ 283777745c05SJosef Bacik dcs = BTRFS_DC_WRITTEN; 283877745c05SJosef Bacik spin_unlock(&block_group->lock); 283977745c05SJosef Bacik goto out_put; 284077745c05SJosef Bacik } 284177745c05SJosef Bacik spin_unlock(&block_group->lock); 284277745c05SJosef Bacik 284377745c05SJosef Bacik /* 284477745c05SJosef Bacik * We hit an ENOSPC when setting up the cache in this transaction, just 284577745c05SJosef Bacik * skip doing the setup, we've already cleared the cache so we're safe. 284677745c05SJosef Bacik */ 284777745c05SJosef Bacik if (test_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags)) { 284877745c05SJosef Bacik ret = -ENOSPC; 284977745c05SJosef Bacik goto out_put; 285077745c05SJosef Bacik } 285177745c05SJosef Bacik 285277745c05SJosef Bacik /* 285377745c05SJosef Bacik * Try to preallocate enough space based on how big the block group is. 285477745c05SJosef Bacik * Keep in mind this has to include any pinned space which could end up 285577745c05SJosef Bacik * taking up quite a bit since it's not folded into the other space 285677745c05SJosef Bacik * cache. 285777745c05SJosef Bacik */ 28580044ae11SQu Wenruo cache_size = div_u64(block_group->length, SZ_256M); 28590044ae11SQu Wenruo if (!cache_size) 28600044ae11SQu Wenruo cache_size = 1; 286177745c05SJosef Bacik 28620044ae11SQu Wenruo cache_size *= 16; 28630044ae11SQu Wenruo cache_size *= fs_info->sectorsize; 286477745c05SJosef Bacik 286536ea6f3eSNikolay Borisov ret = btrfs_check_data_free_space(BTRFS_I(inode), &data_reserved, 0, 28660044ae11SQu Wenruo cache_size); 286777745c05SJosef Bacik if (ret) 286877745c05SJosef Bacik goto out_put; 286977745c05SJosef Bacik 28700044ae11SQu Wenruo ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, cache_size, 28710044ae11SQu Wenruo cache_size, cache_size, 287277745c05SJosef Bacik &alloc_hint); 287377745c05SJosef Bacik /* 287477745c05SJosef Bacik * Our cache requires contiguous chunks so that we don't modify a bunch 287577745c05SJosef Bacik * of metadata or split extents when writing the cache out, which means 287677745c05SJosef Bacik * we can enospc if we are heavily fragmented in addition to just normal 287777745c05SJosef Bacik * out of space conditions. So if we hit this just skip setting up any 287877745c05SJosef Bacik * other block groups for this transaction, maybe we'll unpin enough 287977745c05SJosef Bacik * space the next time around. 288077745c05SJosef Bacik */ 288177745c05SJosef Bacik if (!ret) 288277745c05SJosef Bacik dcs = BTRFS_DC_SETUP; 288377745c05SJosef Bacik else if (ret == -ENOSPC) 288477745c05SJosef Bacik set_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags); 288577745c05SJosef Bacik 288677745c05SJosef Bacik out_put: 288777745c05SJosef Bacik iput(inode); 288877745c05SJosef Bacik out_free: 288977745c05SJosef Bacik btrfs_release_path(path); 289077745c05SJosef Bacik out: 289177745c05SJosef Bacik spin_lock(&block_group->lock); 289277745c05SJosef Bacik if (!ret && dcs == BTRFS_DC_SETUP) 289377745c05SJosef Bacik block_group->cache_generation = trans->transid; 289477745c05SJosef Bacik block_group->disk_cache_state = dcs; 289577745c05SJosef Bacik spin_unlock(&block_group->lock); 289677745c05SJosef Bacik 289777745c05SJosef Bacik extent_changeset_free(data_reserved); 289877745c05SJosef Bacik return ret; 289977745c05SJosef Bacik } 290077745c05SJosef Bacik 290177745c05SJosef Bacik int btrfs_setup_space_cache(struct btrfs_trans_handle *trans) 290277745c05SJosef Bacik { 290377745c05SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 290432da5386SDavid Sterba struct btrfs_block_group *cache, *tmp; 290577745c05SJosef Bacik struct btrfs_transaction *cur_trans = trans->transaction; 290677745c05SJosef Bacik struct btrfs_path *path; 290777745c05SJosef Bacik 290877745c05SJosef Bacik if (list_empty(&cur_trans->dirty_bgs) || 290977745c05SJosef Bacik !btrfs_test_opt(fs_info, SPACE_CACHE)) 291077745c05SJosef Bacik return 0; 291177745c05SJosef Bacik 291277745c05SJosef Bacik path = btrfs_alloc_path(); 291377745c05SJosef Bacik if (!path) 291477745c05SJosef Bacik return -ENOMEM; 291577745c05SJosef Bacik 291677745c05SJosef Bacik /* Could add new block groups, use _safe just in case */ 291777745c05SJosef Bacik list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs, 291877745c05SJosef Bacik dirty_list) { 291977745c05SJosef Bacik if (cache->disk_cache_state == BTRFS_DC_CLEAR) 292077745c05SJosef Bacik cache_save_setup(cache, trans, path); 292177745c05SJosef Bacik } 292277745c05SJosef Bacik 292377745c05SJosef Bacik btrfs_free_path(path); 292477745c05SJosef Bacik return 0; 292577745c05SJosef Bacik } 292677745c05SJosef Bacik 292777745c05SJosef Bacik /* 292877745c05SJosef Bacik * Transaction commit does final block group cache writeback during a critical 292977745c05SJosef Bacik * section where nothing is allowed to change the FS. This is required in 293077745c05SJosef Bacik * order for the cache to actually match the block group, but can introduce a 293177745c05SJosef Bacik * lot of latency into the commit. 293277745c05SJosef Bacik * 293377745c05SJosef Bacik * So, btrfs_start_dirty_block_groups is here to kick off block group cache IO. 293477745c05SJosef Bacik * There's a chance we'll have to redo some of it if the block group changes 293577745c05SJosef Bacik * again during the commit, but it greatly reduces the commit latency by 293677745c05SJosef Bacik * getting rid of the easy block groups while we're still allowing others to 293777745c05SJosef Bacik * join the commit. 293877745c05SJosef Bacik */ 293977745c05SJosef Bacik int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans) 294077745c05SJosef Bacik { 294177745c05SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 294232da5386SDavid Sterba struct btrfs_block_group *cache; 294377745c05SJosef Bacik struct btrfs_transaction *cur_trans = trans->transaction; 294477745c05SJosef Bacik int ret = 0; 294577745c05SJosef Bacik int should_put; 294677745c05SJosef Bacik struct btrfs_path *path = NULL; 294777745c05SJosef Bacik LIST_HEAD(dirty); 294877745c05SJosef Bacik struct list_head *io = &cur_trans->io_bgs; 294977745c05SJosef Bacik int loops = 0; 295077745c05SJosef Bacik 295177745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 295277745c05SJosef Bacik if (list_empty(&cur_trans->dirty_bgs)) { 295377745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 295477745c05SJosef Bacik return 0; 295577745c05SJosef Bacik } 295677745c05SJosef Bacik list_splice_init(&cur_trans->dirty_bgs, &dirty); 295777745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 295877745c05SJosef Bacik 295977745c05SJosef Bacik again: 296077745c05SJosef Bacik /* Make sure all the block groups on our dirty list actually exist */ 296177745c05SJosef Bacik btrfs_create_pending_block_groups(trans); 296277745c05SJosef Bacik 296377745c05SJosef Bacik if (!path) { 296477745c05SJosef Bacik path = btrfs_alloc_path(); 2965938fcbfbSJosef Bacik if (!path) { 2966938fcbfbSJosef Bacik ret = -ENOMEM; 2967938fcbfbSJosef Bacik goto out; 2968938fcbfbSJosef Bacik } 296977745c05SJosef Bacik } 297077745c05SJosef Bacik 297177745c05SJosef Bacik /* 297277745c05SJosef Bacik * cache_write_mutex is here only to save us from balance or automatic 297377745c05SJosef Bacik * removal of empty block groups deleting this block group while we are 297477745c05SJosef Bacik * writing out the cache 297577745c05SJosef Bacik */ 297677745c05SJosef Bacik mutex_lock(&trans->transaction->cache_write_mutex); 297777745c05SJosef Bacik while (!list_empty(&dirty)) { 297877745c05SJosef Bacik bool drop_reserve = true; 297977745c05SJosef Bacik 298032da5386SDavid Sterba cache = list_first_entry(&dirty, struct btrfs_block_group, 298177745c05SJosef Bacik dirty_list); 298277745c05SJosef Bacik /* 298377745c05SJosef Bacik * This can happen if something re-dirties a block group that 298477745c05SJosef Bacik * is already under IO. Just wait for it to finish and then do 298577745c05SJosef Bacik * it all again 298677745c05SJosef Bacik */ 298777745c05SJosef Bacik if (!list_empty(&cache->io_list)) { 298877745c05SJosef Bacik list_del_init(&cache->io_list); 298977745c05SJosef Bacik btrfs_wait_cache_io(trans, cache, path); 299077745c05SJosef Bacik btrfs_put_block_group(cache); 299177745c05SJosef Bacik } 299277745c05SJosef Bacik 299377745c05SJosef Bacik 299477745c05SJosef Bacik /* 299577745c05SJosef Bacik * btrfs_wait_cache_io uses the cache->dirty_list to decide if 299677745c05SJosef Bacik * it should update the cache_state. Don't delete until after 299777745c05SJosef Bacik * we wait. 299877745c05SJosef Bacik * 299977745c05SJosef Bacik * Since we're not running in the commit critical section 300077745c05SJosef Bacik * we need the dirty_bgs_lock to protect from update_block_group 300177745c05SJosef Bacik */ 300277745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 300377745c05SJosef Bacik list_del_init(&cache->dirty_list); 300477745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 300577745c05SJosef Bacik 300677745c05SJosef Bacik should_put = 1; 300777745c05SJosef Bacik 300877745c05SJosef Bacik cache_save_setup(cache, trans, path); 300977745c05SJosef Bacik 301077745c05SJosef Bacik if (cache->disk_cache_state == BTRFS_DC_SETUP) { 301177745c05SJosef Bacik cache->io_ctl.inode = NULL; 301277745c05SJosef Bacik ret = btrfs_write_out_cache(trans, cache, path); 301377745c05SJosef Bacik if (ret == 0 && cache->io_ctl.inode) { 301477745c05SJosef Bacik should_put = 0; 301577745c05SJosef Bacik 301677745c05SJosef Bacik /* 301777745c05SJosef Bacik * The cache_write_mutex is protecting the 301877745c05SJosef Bacik * io_list, also refer to the definition of 301977745c05SJosef Bacik * btrfs_transaction::io_bgs for more details 302077745c05SJosef Bacik */ 302177745c05SJosef Bacik list_add_tail(&cache->io_list, io); 302277745c05SJosef Bacik } else { 302377745c05SJosef Bacik /* 302477745c05SJosef Bacik * If we failed to write the cache, the 302577745c05SJosef Bacik * generation will be bad and life goes on 302677745c05SJosef Bacik */ 302777745c05SJosef Bacik ret = 0; 302877745c05SJosef Bacik } 302977745c05SJosef Bacik } 303077745c05SJosef Bacik if (!ret) { 30313be4d8efSQu Wenruo ret = update_block_group_item(trans, path, cache); 303277745c05SJosef Bacik /* 303377745c05SJosef Bacik * Our block group might still be attached to the list 303477745c05SJosef Bacik * of new block groups in the transaction handle of some 303577745c05SJosef Bacik * other task (struct btrfs_trans_handle->new_bgs). This 303677745c05SJosef Bacik * means its block group item isn't yet in the extent 303777745c05SJosef Bacik * tree. If this happens ignore the error, as we will 303877745c05SJosef Bacik * try again later in the critical section of the 303977745c05SJosef Bacik * transaction commit. 304077745c05SJosef Bacik */ 304177745c05SJosef Bacik if (ret == -ENOENT) { 304277745c05SJosef Bacik ret = 0; 304377745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 304477745c05SJosef Bacik if (list_empty(&cache->dirty_list)) { 304577745c05SJosef Bacik list_add_tail(&cache->dirty_list, 304677745c05SJosef Bacik &cur_trans->dirty_bgs); 304777745c05SJosef Bacik btrfs_get_block_group(cache); 304877745c05SJosef Bacik drop_reserve = false; 304977745c05SJosef Bacik } 305077745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 305177745c05SJosef Bacik } else if (ret) { 305277745c05SJosef Bacik btrfs_abort_transaction(trans, ret); 305377745c05SJosef Bacik } 305477745c05SJosef Bacik } 305577745c05SJosef Bacik 305677745c05SJosef Bacik /* If it's not on the io list, we need to put the block group */ 305777745c05SJosef Bacik if (should_put) 305877745c05SJosef Bacik btrfs_put_block_group(cache); 305977745c05SJosef Bacik if (drop_reserve) 306077745c05SJosef Bacik btrfs_delayed_refs_rsv_release(fs_info, 1); 306177745c05SJosef Bacik /* 306277745c05SJosef Bacik * Avoid blocking other tasks for too long. It might even save 306377745c05SJosef Bacik * us from writing caches for block groups that are going to be 306477745c05SJosef Bacik * removed. 306577745c05SJosef Bacik */ 306677745c05SJosef Bacik mutex_unlock(&trans->transaction->cache_write_mutex); 3067938fcbfbSJosef Bacik if (ret) 3068938fcbfbSJosef Bacik goto out; 306977745c05SJosef Bacik mutex_lock(&trans->transaction->cache_write_mutex); 307077745c05SJosef Bacik } 307177745c05SJosef Bacik mutex_unlock(&trans->transaction->cache_write_mutex); 307277745c05SJosef Bacik 307377745c05SJosef Bacik /* 307477745c05SJosef Bacik * Go through delayed refs for all the stuff we've just kicked off 307577745c05SJosef Bacik * and then loop back (just once) 307677745c05SJosef Bacik */ 307734d1eb0eSJosef Bacik if (!ret) 307877745c05SJosef Bacik ret = btrfs_run_delayed_refs(trans, 0); 307977745c05SJosef Bacik if (!ret && loops == 0) { 308077745c05SJosef Bacik loops++; 308177745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 308277745c05SJosef Bacik list_splice_init(&cur_trans->dirty_bgs, &dirty); 308377745c05SJosef Bacik /* 308477745c05SJosef Bacik * dirty_bgs_lock protects us from concurrent block group 308577745c05SJosef Bacik * deletes too (not just cache_write_mutex). 308677745c05SJosef Bacik */ 308777745c05SJosef Bacik if (!list_empty(&dirty)) { 308877745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 308977745c05SJosef Bacik goto again; 309077745c05SJosef Bacik } 309177745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 3092938fcbfbSJosef Bacik } 3093938fcbfbSJosef Bacik out: 3094938fcbfbSJosef Bacik if (ret < 0) { 3095938fcbfbSJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 3096938fcbfbSJosef Bacik list_splice_init(&dirty, &cur_trans->dirty_bgs); 3097938fcbfbSJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 309877745c05SJosef Bacik btrfs_cleanup_dirty_bgs(cur_trans, fs_info); 309977745c05SJosef Bacik } 310077745c05SJosef Bacik 310177745c05SJosef Bacik btrfs_free_path(path); 310277745c05SJosef Bacik return ret; 310377745c05SJosef Bacik } 310477745c05SJosef Bacik 310577745c05SJosef Bacik int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans) 310677745c05SJosef Bacik { 310777745c05SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 310832da5386SDavid Sterba struct btrfs_block_group *cache; 310977745c05SJosef Bacik struct btrfs_transaction *cur_trans = trans->transaction; 311077745c05SJosef Bacik int ret = 0; 311177745c05SJosef Bacik int should_put; 311277745c05SJosef Bacik struct btrfs_path *path; 311377745c05SJosef Bacik struct list_head *io = &cur_trans->io_bgs; 311477745c05SJosef Bacik 311577745c05SJosef Bacik path = btrfs_alloc_path(); 311677745c05SJosef Bacik if (!path) 311777745c05SJosef Bacik return -ENOMEM; 311877745c05SJosef Bacik 311977745c05SJosef Bacik /* 312077745c05SJosef Bacik * Even though we are in the critical section of the transaction commit, 312177745c05SJosef Bacik * we can still have concurrent tasks adding elements to this 312277745c05SJosef Bacik * transaction's list of dirty block groups. These tasks correspond to 312377745c05SJosef Bacik * endio free space workers started when writeback finishes for a 312477745c05SJosef Bacik * space cache, which run inode.c:btrfs_finish_ordered_io(), and can 312577745c05SJosef Bacik * allocate new block groups as a result of COWing nodes of the root 312677745c05SJosef Bacik * tree when updating the free space inode. The writeback for the space 312777745c05SJosef Bacik * caches is triggered by an earlier call to 312877745c05SJosef Bacik * btrfs_start_dirty_block_groups() and iterations of the following 312977745c05SJosef Bacik * loop. 313077745c05SJosef Bacik * Also we want to do the cache_save_setup first and then run the 313177745c05SJosef Bacik * delayed refs to make sure we have the best chance at doing this all 313277745c05SJosef Bacik * in one shot. 313377745c05SJosef Bacik */ 313477745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 313577745c05SJosef Bacik while (!list_empty(&cur_trans->dirty_bgs)) { 313677745c05SJosef Bacik cache = list_first_entry(&cur_trans->dirty_bgs, 313732da5386SDavid Sterba struct btrfs_block_group, 313877745c05SJosef Bacik dirty_list); 313977745c05SJosef Bacik 314077745c05SJosef Bacik /* 314177745c05SJosef Bacik * This can happen if cache_save_setup re-dirties a block group 314277745c05SJosef Bacik * that is already under IO. Just wait for it to finish and 314377745c05SJosef Bacik * then do it all again 314477745c05SJosef Bacik */ 314577745c05SJosef Bacik if (!list_empty(&cache->io_list)) { 314677745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 314777745c05SJosef Bacik list_del_init(&cache->io_list); 314877745c05SJosef Bacik btrfs_wait_cache_io(trans, cache, path); 314977745c05SJosef Bacik btrfs_put_block_group(cache); 315077745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 315177745c05SJosef Bacik } 315277745c05SJosef Bacik 315377745c05SJosef Bacik /* 315477745c05SJosef Bacik * Don't remove from the dirty list until after we've waited on 315577745c05SJosef Bacik * any pending IO 315677745c05SJosef Bacik */ 315777745c05SJosef Bacik list_del_init(&cache->dirty_list); 315877745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 315977745c05SJosef Bacik should_put = 1; 316077745c05SJosef Bacik 316177745c05SJosef Bacik cache_save_setup(cache, trans, path); 316277745c05SJosef Bacik 316377745c05SJosef Bacik if (!ret) 316477745c05SJosef Bacik ret = btrfs_run_delayed_refs(trans, 316577745c05SJosef Bacik (unsigned long) -1); 316677745c05SJosef Bacik 316777745c05SJosef Bacik if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) { 316877745c05SJosef Bacik cache->io_ctl.inode = NULL; 316977745c05SJosef Bacik ret = btrfs_write_out_cache(trans, cache, path); 317077745c05SJosef Bacik if (ret == 0 && cache->io_ctl.inode) { 317177745c05SJosef Bacik should_put = 0; 317277745c05SJosef Bacik list_add_tail(&cache->io_list, io); 317377745c05SJosef Bacik } else { 317477745c05SJosef Bacik /* 317577745c05SJosef Bacik * If we failed to write the cache, the 317677745c05SJosef Bacik * generation will be bad and life goes on 317777745c05SJosef Bacik */ 317877745c05SJosef Bacik ret = 0; 317977745c05SJosef Bacik } 318077745c05SJosef Bacik } 318177745c05SJosef Bacik if (!ret) { 31823be4d8efSQu Wenruo ret = update_block_group_item(trans, path, cache); 318377745c05SJosef Bacik /* 318477745c05SJosef Bacik * One of the free space endio workers might have 318577745c05SJosef Bacik * created a new block group while updating a free space 318677745c05SJosef Bacik * cache's inode (at inode.c:btrfs_finish_ordered_io()) 318777745c05SJosef Bacik * and hasn't released its transaction handle yet, in 318877745c05SJosef Bacik * which case the new block group is still attached to 318977745c05SJosef Bacik * its transaction handle and its creation has not 319077745c05SJosef Bacik * finished yet (no block group item in the extent tree 319177745c05SJosef Bacik * yet, etc). If this is the case, wait for all free 319277745c05SJosef Bacik * space endio workers to finish and retry. This is a 3193260db43cSRandy Dunlap * very rare case so no need for a more efficient and 319477745c05SJosef Bacik * complex approach. 319577745c05SJosef Bacik */ 319677745c05SJosef Bacik if (ret == -ENOENT) { 319777745c05SJosef Bacik wait_event(cur_trans->writer_wait, 319877745c05SJosef Bacik atomic_read(&cur_trans->num_writers) == 1); 31993be4d8efSQu Wenruo ret = update_block_group_item(trans, path, cache); 320077745c05SJosef Bacik } 320177745c05SJosef Bacik if (ret) 320277745c05SJosef Bacik btrfs_abort_transaction(trans, ret); 320377745c05SJosef Bacik } 320477745c05SJosef Bacik 320577745c05SJosef Bacik /* If its not on the io list, we need to put the block group */ 320677745c05SJosef Bacik if (should_put) 320777745c05SJosef Bacik btrfs_put_block_group(cache); 320877745c05SJosef Bacik btrfs_delayed_refs_rsv_release(fs_info, 1); 320977745c05SJosef Bacik spin_lock(&cur_trans->dirty_bgs_lock); 321077745c05SJosef Bacik } 321177745c05SJosef Bacik spin_unlock(&cur_trans->dirty_bgs_lock); 321277745c05SJosef Bacik 321377745c05SJosef Bacik /* 321477745c05SJosef Bacik * Refer to the definition of io_bgs member for details why it's safe 321577745c05SJosef Bacik * to use it without any locking 321677745c05SJosef Bacik */ 321777745c05SJosef Bacik while (!list_empty(io)) { 321832da5386SDavid Sterba cache = list_first_entry(io, struct btrfs_block_group, 321977745c05SJosef Bacik io_list); 322077745c05SJosef Bacik list_del_init(&cache->io_list); 322177745c05SJosef Bacik btrfs_wait_cache_io(trans, cache, path); 322277745c05SJosef Bacik btrfs_put_block_group(cache); 322377745c05SJosef Bacik } 322477745c05SJosef Bacik 322577745c05SJosef Bacik btrfs_free_path(path); 322677745c05SJosef Bacik return ret; 322777745c05SJosef Bacik } 3228606d1bf1SJosef Bacik 3229ac2f1e63SJosef Bacik static inline bool should_reclaim_block_group(struct btrfs_block_group *bg, 3230ac2f1e63SJosef Bacik u64 bytes_freed) 3231ac2f1e63SJosef Bacik { 3232ac2f1e63SJosef Bacik const struct btrfs_space_info *space_info = bg->space_info; 3233ac2f1e63SJosef Bacik const int reclaim_thresh = READ_ONCE(space_info->bg_reclaim_threshold); 3234ac2f1e63SJosef Bacik const u64 new_val = bg->used; 3235ac2f1e63SJosef Bacik const u64 old_val = new_val + bytes_freed; 3236ac2f1e63SJosef Bacik u64 thresh; 3237ac2f1e63SJosef Bacik 3238ac2f1e63SJosef Bacik if (reclaim_thresh == 0) 3239ac2f1e63SJosef Bacik return false; 3240ac2f1e63SJosef Bacik 3241ac2f1e63SJosef Bacik thresh = div_factor_fine(bg->length, reclaim_thresh); 3242ac2f1e63SJosef Bacik 3243ac2f1e63SJosef Bacik /* 3244ac2f1e63SJosef Bacik * If we were below the threshold before don't reclaim, we are likely a 3245ac2f1e63SJosef Bacik * brand new block group and we don't want to relocate new block groups. 3246ac2f1e63SJosef Bacik */ 3247ac2f1e63SJosef Bacik if (old_val < thresh) 3248ac2f1e63SJosef Bacik return false; 3249ac2f1e63SJosef Bacik if (new_val >= thresh) 3250ac2f1e63SJosef Bacik return false; 3251ac2f1e63SJosef Bacik return true; 3252ac2f1e63SJosef Bacik } 3253ac2f1e63SJosef Bacik 3254606d1bf1SJosef Bacik int btrfs_update_block_group(struct btrfs_trans_handle *trans, 325511b66fa6SAnand Jain u64 bytenr, u64 num_bytes, bool alloc) 3256606d1bf1SJosef Bacik { 3257606d1bf1SJosef Bacik struct btrfs_fs_info *info = trans->fs_info; 325832da5386SDavid Sterba struct btrfs_block_group *cache = NULL; 3259606d1bf1SJosef Bacik u64 total = num_bytes; 3260606d1bf1SJosef Bacik u64 old_val; 3261606d1bf1SJosef Bacik u64 byte_in_group; 3262606d1bf1SJosef Bacik int factor; 3263606d1bf1SJosef Bacik int ret = 0; 3264606d1bf1SJosef Bacik 3265606d1bf1SJosef Bacik /* Block accounting for super block */ 3266606d1bf1SJosef Bacik spin_lock(&info->delalloc_root_lock); 3267606d1bf1SJosef Bacik old_val = btrfs_super_bytes_used(info->super_copy); 3268606d1bf1SJosef Bacik if (alloc) 3269606d1bf1SJosef Bacik old_val += num_bytes; 3270606d1bf1SJosef Bacik else 3271606d1bf1SJosef Bacik old_val -= num_bytes; 3272606d1bf1SJosef Bacik btrfs_set_super_bytes_used(info->super_copy, old_val); 3273606d1bf1SJosef Bacik spin_unlock(&info->delalloc_root_lock); 3274606d1bf1SJosef Bacik 3275606d1bf1SJosef Bacik while (total) { 3276ac2f1e63SJosef Bacik bool reclaim; 3277ac2f1e63SJosef Bacik 3278606d1bf1SJosef Bacik cache = btrfs_lookup_block_group(info, bytenr); 3279606d1bf1SJosef Bacik if (!cache) { 3280606d1bf1SJosef Bacik ret = -ENOENT; 3281606d1bf1SJosef Bacik break; 3282606d1bf1SJosef Bacik } 3283606d1bf1SJosef Bacik factor = btrfs_bg_type_to_factor(cache->flags); 3284606d1bf1SJosef Bacik 3285606d1bf1SJosef Bacik /* 3286606d1bf1SJosef Bacik * If this block group has free space cache written out, we 3287606d1bf1SJosef Bacik * need to make sure to load it if we are removing space. This 3288606d1bf1SJosef Bacik * is because we need the unpinning stage to actually add the 3289606d1bf1SJosef Bacik * space back to the block group, otherwise we will leak space. 3290606d1bf1SJosef Bacik */ 329132da5386SDavid Sterba if (!alloc && !btrfs_block_group_done(cache)) 3292606d1bf1SJosef Bacik btrfs_cache_block_group(cache, 1); 3293606d1bf1SJosef Bacik 3294b3470b5dSDavid Sterba byte_in_group = bytenr - cache->start; 3295b3470b5dSDavid Sterba WARN_ON(byte_in_group > cache->length); 3296606d1bf1SJosef Bacik 3297606d1bf1SJosef Bacik spin_lock(&cache->space_info->lock); 3298606d1bf1SJosef Bacik spin_lock(&cache->lock); 3299606d1bf1SJosef Bacik 3300606d1bf1SJosef Bacik if (btrfs_test_opt(info, SPACE_CACHE) && 3301606d1bf1SJosef Bacik cache->disk_cache_state < BTRFS_DC_CLEAR) 3302606d1bf1SJosef Bacik cache->disk_cache_state = BTRFS_DC_CLEAR; 3303606d1bf1SJosef Bacik 3304bf38be65SDavid Sterba old_val = cache->used; 3305b3470b5dSDavid Sterba num_bytes = min(total, cache->length - byte_in_group); 3306606d1bf1SJosef Bacik if (alloc) { 3307606d1bf1SJosef Bacik old_val += num_bytes; 3308bf38be65SDavid Sterba cache->used = old_val; 3309606d1bf1SJosef Bacik cache->reserved -= num_bytes; 3310606d1bf1SJosef Bacik cache->space_info->bytes_reserved -= num_bytes; 3311606d1bf1SJosef Bacik cache->space_info->bytes_used += num_bytes; 3312606d1bf1SJosef Bacik cache->space_info->disk_used += num_bytes * factor; 3313606d1bf1SJosef Bacik spin_unlock(&cache->lock); 3314606d1bf1SJosef Bacik spin_unlock(&cache->space_info->lock); 3315606d1bf1SJosef Bacik } else { 3316606d1bf1SJosef Bacik old_val -= num_bytes; 3317bf38be65SDavid Sterba cache->used = old_val; 3318606d1bf1SJosef Bacik cache->pinned += num_bytes; 3319606d1bf1SJosef Bacik btrfs_space_info_update_bytes_pinned(info, 3320606d1bf1SJosef Bacik cache->space_info, num_bytes); 3321606d1bf1SJosef Bacik cache->space_info->bytes_used -= num_bytes; 3322606d1bf1SJosef Bacik cache->space_info->disk_used -= num_bytes * factor; 3323ac2f1e63SJosef Bacik 3324ac2f1e63SJosef Bacik reclaim = should_reclaim_block_group(cache, num_bytes); 3325606d1bf1SJosef Bacik spin_unlock(&cache->lock); 3326606d1bf1SJosef Bacik spin_unlock(&cache->space_info->lock); 3327606d1bf1SJosef Bacik 3328fe119a6eSNikolay Borisov set_extent_dirty(&trans->transaction->pinned_extents, 3329606d1bf1SJosef Bacik bytenr, bytenr + num_bytes - 1, 3330606d1bf1SJosef Bacik GFP_NOFS | __GFP_NOFAIL); 3331606d1bf1SJosef Bacik } 3332606d1bf1SJosef Bacik 3333606d1bf1SJosef Bacik spin_lock(&trans->transaction->dirty_bgs_lock); 3334606d1bf1SJosef Bacik if (list_empty(&cache->dirty_list)) { 3335606d1bf1SJosef Bacik list_add_tail(&cache->dirty_list, 3336606d1bf1SJosef Bacik &trans->transaction->dirty_bgs); 3337606d1bf1SJosef Bacik trans->delayed_ref_updates++; 3338606d1bf1SJosef Bacik btrfs_get_block_group(cache); 3339606d1bf1SJosef Bacik } 3340606d1bf1SJosef Bacik spin_unlock(&trans->transaction->dirty_bgs_lock); 3341606d1bf1SJosef Bacik 3342606d1bf1SJosef Bacik /* 3343606d1bf1SJosef Bacik * No longer have used bytes in this block group, queue it for 3344606d1bf1SJosef Bacik * deletion. We do this after adding the block group to the 3345606d1bf1SJosef Bacik * dirty list to avoid races between cleaner kthread and space 3346606d1bf1SJosef Bacik * cache writeout. 3347606d1bf1SJosef Bacik */ 33486e80d4f8SDennis Zhou if (!alloc && old_val == 0) { 33496e80d4f8SDennis Zhou if (!btrfs_test_opt(info, DISCARD_ASYNC)) 3350606d1bf1SJosef Bacik btrfs_mark_bg_unused(cache); 3351ac2f1e63SJosef Bacik } else if (!alloc && reclaim) { 3352ac2f1e63SJosef Bacik btrfs_mark_bg_to_reclaim(cache); 33536e80d4f8SDennis Zhou } 3354606d1bf1SJosef Bacik 3355606d1bf1SJosef Bacik btrfs_put_block_group(cache); 3356606d1bf1SJosef Bacik total -= num_bytes; 3357606d1bf1SJosef Bacik bytenr += num_bytes; 3358606d1bf1SJosef Bacik } 3359606d1bf1SJosef Bacik 3360606d1bf1SJosef Bacik /* Modified block groups are accounted for in the delayed_refs_rsv. */ 3361606d1bf1SJosef Bacik btrfs_update_delayed_refs_rsv(trans); 3362606d1bf1SJosef Bacik return ret; 3363606d1bf1SJosef Bacik } 3364606d1bf1SJosef Bacik 3365606d1bf1SJosef Bacik /** 3366606d1bf1SJosef Bacik * btrfs_add_reserved_bytes - update the block_group and space info counters 3367606d1bf1SJosef Bacik * @cache: The cache we are manipulating 3368606d1bf1SJosef Bacik * @ram_bytes: The number of bytes of file content, and will be same to 3369606d1bf1SJosef Bacik * @num_bytes except for the compress path. 3370606d1bf1SJosef Bacik * @num_bytes: The number of bytes in question 3371606d1bf1SJosef Bacik * @delalloc: The blocks are allocated for the delalloc write 3372606d1bf1SJosef Bacik * 3373606d1bf1SJosef Bacik * This is called by the allocator when it reserves space. If this is a 3374606d1bf1SJosef Bacik * reservation and the block group has become read only we cannot make the 3375606d1bf1SJosef Bacik * reservation and return -EAGAIN, otherwise this function always succeeds. 3376606d1bf1SJosef Bacik */ 337732da5386SDavid Sterba int btrfs_add_reserved_bytes(struct btrfs_block_group *cache, 3378606d1bf1SJosef Bacik u64 ram_bytes, u64 num_bytes, int delalloc) 3379606d1bf1SJosef Bacik { 3380606d1bf1SJosef Bacik struct btrfs_space_info *space_info = cache->space_info; 3381606d1bf1SJosef Bacik int ret = 0; 3382606d1bf1SJosef Bacik 3383606d1bf1SJosef Bacik spin_lock(&space_info->lock); 3384606d1bf1SJosef Bacik spin_lock(&cache->lock); 3385606d1bf1SJosef Bacik if (cache->ro) { 3386606d1bf1SJosef Bacik ret = -EAGAIN; 3387606d1bf1SJosef Bacik } else { 3388606d1bf1SJosef Bacik cache->reserved += num_bytes; 3389606d1bf1SJosef Bacik space_info->bytes_reserved += num_bytes; 3390a43c3835SJosef Bacik trace_btrfs_space_reservation(cache->fs_info, "space_info", 3391a43c3835SJosef Bacik space_info->flags, num_bytes, 1); 3392606d1bf1SJosef Bacik btrfs_space_info_update_bytes_may_use(cache->fs_info, 3393606d1bf1SJosef Bacik space_info, -ram_bytes); 3394606d1bf1SJosef Bacik if (delalloc) 3395606d1bf1SJosef Bacik cache->delalloc_bytes += num_bytes; 339699ffb43eSJosef Bacik 339799ffb43eSJosef Bacik /* 339899ffb43eSJosef Bacik * Compression can use less space than we reserved, so wake 339999ffb43eSJosef Bacik * tickets if that happens 340099ffb43eSJosef Bacik */ 340199ffb43eSJosef Bacik if (num_bytes < ram_bytes) 340299ffb43eSJosef Bacik btrfs_try_granting_tickets(cache->fs_info, space_info); 3403606d1bf1SJosef Bacik } 3404606d1bf1SJosef Bacik spin_unlock(&cache->lock); 3405606d1bf1SJosef Bacik spin_unlock(&space_info->lock); 3406606d1bf1SJosef Bacik return ret; 3407606d1bf1SJosef Bacik } 3408606d1bf1SJosef Bacik 3409606d1bf1SJosef Bacik /** 3410606d1bf1SJosef Bacik * btrfs_free_reserved_bytes - update the block_group and space info counters 3411606d1bf1SJosef Bacik * @cache: The cache we are manipulating 3412606d1bf1SJosef Bacik * @num_bytes: The number of bytes in question 3413606d1bf1SJosef Bacik * @delalloc: The blocks are allocated for the delalloc write 3414606d1bf1SJosef Bacik * 3415606d1bf1SJosef Bacik * This is called by somebody who is freeing space that was never actually used 3416606d1bf1SJosef Bacik * on disk. For example if you reserve some space for a new leaf in transaction 3417606d1bf1SJosef Bacik * A and before transaction A commits you free that leaf, you call this with 3418606d1bf1SJosef Bacik * reserve set to 0 in order to clear the reservation. 3419606d1bf1SJosef Bacik */ 342032da5386SDavid Sterba void btrfs_free_reserved_bytes(struct btrfs_block_group *cache, 3421606d1bf1SJosef Bacik u64 num_bytes, int delalloc) 3422606d1bf1SJosef Bacik { 3423606d1bf1SJosef Bacik struct btrfs_space_info *space_info = cache->space_info; 3424606d1bf1SJosef Bacik 3425606d1bf1SJosef Bacik spin_lock(&space_info->lock); 3426606d1bf1SJosef Bacik spin_lock(&cache->lock); 3427606d1bf1SJosef Bacik if (cache->ro) 3428606d1bf1SJosef Bacik space_info->bytes_readonly += num_bytes; 3429606d1bf1SJosef Bacik cache->reserved -= num_bytes; 3430606d1bf1SJosef Bacik space_info->bytes_reserved -= num_bytes; 3431606d1bf1SJosef Bacik space_info->max_extent_size = 0; 3432606d1bf1SJosef Bacik 3433606d1bf1SJosef Bacik if (delalloc) 3434606d1bf1SJosef Bacik cache->delalloc_bytes -= num_bytes; 3435606d1bf1SJosef Bacik spin_unlock(&cache->lock); 34363308234aSJosef Bacik 34373308234aSJosef Bacik btrfs_try_granting_tickets(cache->fs_info, space_info); 3438606d1bf1SJosef Bacik spin_unlock(&space_info->lock); 3439606d1bf1SJosef Bacik } 344007730d87SJosef Bacik 344107730d87SJosef Bacik static void force_metadata_allocation(struct btrfs_fs_info *info) 344207730d87SJosef Bacik { 344307730d87SJosef Bacik struct list_head *head = &info->space_info; 344407730d87SJosef Bacik struct btrfs_space_info *found; 344507730d87SJosef Bacik 344672804905SJosef Bacik list_for_each_entry(found, head, list) { 344707730d87SJosef Bacik if (found->flags & BTRFS_BLOCK_GROUP_METADATA) 344807730d87SJosef Bacik found->force_alloc = CHUNK_ALLOC_FORCE; 344907730d87SJosef Bacik } 345007730d87SJosef Bacik } 345107730d87SJosef Bacik 345207730d87SJosef Bacik static int should_alloc_chunk(struct btrfs_fs_info *fs_info, 345307730d87SJosef Bacik struct btrfs_space_info *sinfo, int force) 345407730d87SJosef Bacik { 345507730d87SJosef Bacik u64 bytes_used = btrfs_space_info_used(sinfo, false); 345607730d87SJosef Bacik u64 thresh; 345707730d87SJosef Bacik 345807730d87SJosef Bacik if (force == CHUNK_ALLOC_FORCE) 345907730d87SJosef Bacik return 1; 346007730d87SJosef Bacik 346107730d87SJosef Bacik /* 346207730d87SJosef Bacik * in limited mode, we want to have some free space up to 346307730d87SJosef Bacik * about 1% of the FS size. 346407730d87SJosef Bacik */ 346507730d87SJosef Bacik if (force == CHUNK_ALLOC_LIMITED) { 346607730d87SJosef Bacik thresh = btrfs_super_total_bytes(fs_info->super_copy); 346707730d87SJosef Bacik thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1)); 346807730d87SJosef Bacik 346907730d87SJosef Bacik if (sinfo->total_bytes - bytes_used < thresh) 347007730d87SJosef Bacik return 1; 347107730d87SJosef Bacik } 347207730d87SJosef Bacik 347307730d87SJosef Bacik if (bytes_used + SZ_2M < div_factor(sinfo->total_bytes, 8)) 347407730d87SJosef Bacik return 0; 347507730d87SJosef Bacik return 1; 347607730d87SJosef Bacik } 347707730d87SJosef Bacik 347807730d87SJosef Bacik int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, u64 type) 347907730d87SJosef Bacik { 348007730d87SJosef Bacik u64 alloc_flags = btrfs_get_alloc_profile(trans->fs_info, type); 348107730d87SJosef Bacik 348207730d87SJosef Bacik return btrfs_chunk_alloc(trans, alloc_flags, CHUNK_ALLOC_FORCE); 348307730d87SJosef Bacik } 348407730d87SJosef Bacik 3485820c363bSNaohiro Aota static struct btrfs_block_group *do_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags) 348679bd3712SFilipe Manana { 348779bd3712SFilipe Manana struct btrfs_block_group *bg; 348879bd3712SFilipe Manana int ret; 348979bd3712SFilipe Manana 349007730d87SJosef Bacik /* 349179bd3712SFilipe Manana * Check if we have enough space in the system space info because we 349279bd3712SFilipe Manana * will need to update device items in the chunk btree and insert a new 349379bd3712SFilipe Manana * chunk item in the chunk btree as well. This will allocate a new 349479bd3712SFilipe Manana * system block group if needed. 349579bd3712SFilipe Manana */ 349679bd3712SFilipe Manana check_system_chunk(trans, flags); 349779bd3712SFilipe Manana 3498f6f39f7aSNikolay Borisov bg = btrfs_create_chunk(trans, flags); 349979bd3712SFilipe Manana if (IS_ERR(bg)) { 350079bd3712SFilipe Manana ret = PTR_ERR(bg); 350179bd3712SFilipe Manana goto out; 350279bd3712SFilipe Manana } 350379bd3712SFilipe Manana 350479bd3712SFilipe Manana ret = btrfs_chunk_alloc_add_chunk_item(trans, bg); 350579bd3712SFilipe Manana /* 350679bd3712SFilipe Manana * Normally we are not expected to fail with -ENOSPC here, since we have 350779bd3712SFilipe Manana * previously reserved space in the system space_info and allocated one 3508ecd84d54SFilipe Manana * new system chunk if necessary. However there are three exceptions: 350979bd3712SFilipe Manana * 351079bd3712SFilipe Manana * 1) We may have enough free space in the system space_info but all the 351179bd3712SFilipe Manana * existing system block groups have a profile which can not be used 351279bd3712SFilipe Manana * for extent allocation. 351379bd3712SFilipe Manana * 351479bd3712SFilipe Manana * This happens when mounting in degraded mode. For example we have a 351579bd3712SFilipe Manana * RAID1 filesystem with 2 devices, lose one device and mount the fs 351679bd3712SFilipe Manana * using the other device in degraded mode. If we then allocate a chunk, 351779bd3712SFilipe Manana * we may have enough free space in the existing system space_info, but 351879bd3712SFilipe Manana * none of the block groups can be used for extent allocation since they 351979bd3712SFilipe Manana * have a RAID1 profile, and because we are in degraded mode with a 352079bd3712SFilipe Manana * single device, we are forced to allocate a new system chunk with a 352179bd3712SFilipe Manana * SINGLE profile. Making check_system_chunk() iterate over all system 352279bd3712SFilipe Manana * block groups and check if they have a usable profile and enough space 352379bd3712SFilipe Manana * can be slow on very large filesystems, so we tolerate the -ENOSPC and 352479bd3712SFilipe Manana * try again after forcing allocation of a new system chunk. Like this 352579bd3712SFilipe Manana * we avoid paying the cost of that search in normal circumstances, when 352679bd3712SFilipe Manana * we were not mounted in degraded mode; 352779bd3712SFilipe Manana * 352879bd3712SFilipe Manana * 2) We had enough free space info the system space_info, and one suitable 352979bd3712SFilipe Manana * block group to allocate from when we called check_system_chunk() 353079bd3712SFilipe Manana * above. However right after we called it, the only system block group 353179bd3712SFilipe Manana * with enough free space got turned into RO mode by a running scrub, 353279bd3712SFilipe Manana * and in this case we have to allocate a new one and retry. We only 353379bd3712SFilipe Manana * need do this allocate and retry once, since we have a transaction 3534ecd84d54SFilipe Manana * handle and scrub uses the commit root to search for block groups; 3535ecd84d54SFilipe Manana * 3536ecd84d54SFilipe Manana * 3) We had one system block group with enough free space when we called 3537ecd84d54SFilipe Manana * check_system_chunk(), but after that, right before we tried to 3538ecd84d54SFilipe Manana * allocate the last extent buffer we needed, a discard operation came 3539ecd84d54SFilipe Manana * in and it temporarily removed the last free space entry from the 3540ecd84d54SFilipe Manana * block group (discard removes a free space entry, discards it, and 3541ecd84d54SFilipe Manana * then adds back the entry to the block group cache). 354279bd3712SFilipe Manana */ 354379bd3712SFilipe Manana if (ret == -ENOSPC) { 354479bd3712SFilipe Manana const u64 sys_flags = btrfs_system_alloc_profile(trans->fs_info); 354579bd3712SFilipe Manana struct btrfs_block_group *sys_bg; 354679bd3712SFilipe Manana 3547f6f39f7aSNikolay Borisov sys_bg = btrfs_create_chunk(trans, sys_flags); 354879bd3712SFilipe Manana if (IS_ERR(sys_bg)) { 354979bd3712SFilipe Manana ret = PTR_ERR(sys_bg); 355079bd3712SFilipe Manana btrfs_abort_transaction(trans, ret); 355179bd3712SFilipe Manana goto out; 355279bd3712SFilipe Manana } 355379bd3712SFilipe Manana 355479bd3712SFilipe Manana ret = btrfs_chunk_alloc_add_chunk_item(trans, sys_bg); 355579bd3712SFilipe Manana if (ret) { 355679bd3712SFilipe Manana btrfs_abort_transaction(trans, ret); 355779bd3712SFilipe Manana goto out; 355879bd3712SFilipe Manana } 355979bd3712SFilipe Manana 356079bd3712SFilipe Manana ret = btrfs_chunk_alloc_add_chunk_item(trans, bg); 356179bd3712SFilipe Manana if (ret) { 356279bd3712SFilipe Manana btrfs_abort_transaction(trans, ret); 356379bd3712SFilipe Manana goto out; 356479bd3712SFilipe Manana } 356579bd3712SFilipe Manana } else if (ret) { 356679bd3712SFilipe Manana btrfs_abort_transaction(trans, ret); 356779bd3712SFilipe Manana goto out; 356879bd3712SFilipe Manana } 356979bd3712SFilipe Manana out: 357079bd3712SFilipe Manana btrfs_trans_release_chunk_metadata(trans); 357179bd3712SFilipe Manana 3572820c363bSNaohiro Aota if (ret) 3573820c363bSNaohiro Aota return ERR_PTR(ret); 3574820c363bSNaohiro Aota 3575820c363bSNaohiro Aota btrfs_get_block_group(bg); 3576820c363bSNaohiro Aota return bg; 357779bd3712SFilipe Manana } 357879bd3712SFilipe Manana 357979bd3712SFilipe Manana /* 358079bd3712SFilipe Manana * Chunk allocation is done in 2 phases: 358179bd3712SFilipe Manana * 358279bd3712SFilipe Manana * 1) Phase 1 - through btrfs_chunk_alloc() we allocate device extents for 358379bd3712SFilipe Manana * the chunk, the chunk mapping, create its block group and add the items 358479bd3712SFilipe Manana * that belong in the chunk btree to it - more specifically, we need to 358579bd3712SFilipe Manana * update device items in the chunk btree and add a new chunk item to it. 358679bd3712SFilipe Manana * 358779bd3712SFilipe Manana * 2) Phase 2 - through btrfs_create_pending_block_groups(), we add the block 358879bd3712SFilipe Manana * group item to the extent btree and the device extent items to the devices 358979bd3712SFilipe Manana * btree. 359079bd3712SFilipe Manana * 359179bd3712SFilipe Manana * This is done to prevent deadlocks. For example when COWing a node from the 359279bd3712SFilipe Manana * extent btree we are holding a write lock on the node's parent and if we 359379bd3712SFilipe Manana * trigger chunk allocation and attempted to insert the new block group item 359479bd3712SFilipe Manana * in the extent btree right way, we could deadlock because the path for the 359579bd3712SFilipe Manana * insertion can include that parent node. At first glance it seems impossible 359679bd3712SFilipe Manana * to trigger chunk allocation after starting a transaction since tasks should 359779bd3712SFilipe Manana * reserve enough transaction units (metadata space), however while that is true 359879bd3712SFilipe Manana * most of the time, chunk allocation may still be triggered for several reasons: 359979bd3712SFilipe Manana * 360079bd3712SFilipe Manana * 1) When reserving metadata, we check if there is enough free space in the 360179bd3712SFilipe Manana * metadata space_info and therefore don't trigger allocation of a new chunk. 360279bd3712SFilipe Manana * However later when the task actually tries to COW an extent buffer from 360379bd3712SFilipe Manana * the extent btree or from the device btree for example, it is forced to 360479bd3712SFilipe Manana * allocate a new block group (chunk) because the only one that had enough 360579bd3712SFilipe Manana * free space was just turned to RO mode by a running scrub for example (or 360679bd3712SFilipe Manana * device replace, block group reclaim thread, etc), so we can not use it 360779bd3712SFilipe Manana * for allocating an extent and end up being forced to allocate a new one; 360879bd3712SFilipe Manana * 360979bd3712SFilipe Manana * 2) Because we only check that the metadata space_info has enough free bytes, 361079bd3712SFilipe Manana * we end up not allocating a new metadata chunk in that case. However if 361179bd3712SFilipe Manana * the filesystem was mounted in degraded mode, none of the existing block 361279bd3712SFilipe Manana * groups might be suitable for extent allocation due to their incompatible 361379bd3712SFilipe Manana * profile (for e.g. mounting a 2 devices filesystem, where all block groups 361479bd3712SFilipe Manana * use a RAID1 profile, in degraded mode using a single device). In this case 361579bd3712SFilipe Manana * when the task attempts to COW some extent buffer of the extent btree for 361679bd3712SFilipe Manana * example, it will trigger allocation of a new metadata block group with a 361779bd3712SFilipe Manana * suitable profile (SINGLE profile in the example of the degraded mount of 361879bd3712SFilipe Manana * the RAID1 filesystem); 361979bd3712SFilipe Manana * 362079bd3712SFilipe Manana * 3) The task has reserved enough transaction units / metadata space, but when 362179bd3712SFilipe Manana * it attempts to COW an extent buffer from the extent or device btree for 362279bd3712SFilipe Manana * example, it does not find any free extent in any metadata block group, 362379bd3712SFilipe Manana * therefore forced to try to allocate a new metadata block group. 362479bd3712SFilipe Manana * This is because some other task allocated all available extents in the 362579bd3712SFilipe Manana * meanwhile - this typically happens with tasks that don't reserve space 362679bd3712SFilipe Manana * properly, either intentionally or as a bug. One example where this is 362779bd3712SFilipe Manana * done intentionally is fsync, as it does not reserve any transaction units 362879bd3712SFilipe Manana * and ends up allocating a variable number of metadata extents for log 3629ecd84d54SFilipe Manana * tree extent buffers; 3630ecd84d54SFilipe Manana * 3631ecd84d54SFilipe Manana * 4) The task has reserved enough transaction units / metadata space, but right 3632ecd84d54SFilipe Manana * before it tries to allocate the last extent buffer it needs, a discard 3633ecd84d54SFilipe Manana * operation comes in and, temporarily, removes the last free space entry from 3634ecd84d54SFilipe Manana * the only metadata block group that had free space (discard starts by 3635ecd84d54SFilipe Manana * removing a free space entry from a block group, then does the discard 3636ecd84d54SFilipe Manana * operation and, once it's done, it adds back the free space entry to the 3637ecd84d54SFilipe Manana * block group). 363879bd3712SFilipe Manana * 363979bd3712SFilipe Manana * We also need this 2 phases setup when adding a device to a filesystem with 364079bd3712SFilipe Manana * a seed device - we must create new metadata and system chunks without adding 364179bd3712SFilipe Manana * any of the block group items to the chunk, extent and device btrees. If we 364279bd3712SFilipe Manana * did not do it this way, we would get ENOSPC when attempting to update those 364379bd3712SFilipe Manana * btrees, since all the chunks from the seed device are read-only. 364479bd3712SFilipe Manana * 364579bd3712SFilipe Manana * Phase 1 does the updates and insertions to the chunk btree because if we had 364679bd3712SFilipe Manana * it done in phase 2 and have a thundering herd of tasks allocating chunks in 364779bd3712SFilipe Manana * parallel, we risk having too many system chunks allocated by many tasks if 364879bd3712SFilipe Manana * many tasks reach phase 1 without the previous ones completing phase 2. In the 364979bd3712SFilipe Manana * extreme case this leads to exhaustion of the system chunk array in the 365079bd3712SFilipe Manana * superblock. This is easier to trigger if using a btree node/leaf size of 64K 365179bd3712SFilipe Manana * and with RAID filesystems (so we have more device items in the chunk btree). 365279bd3712SFilipe Manana * This has happened before and commit eafa4fd0ad0607 ("btrfs: fix exhaustion of 365379bd3712SFilipe Manana * the system chunk array due to concurrent allocations") provides more details. 365479bd3712SFilipe Manana * 36552bb2e00eSFilipe Manana * Allocation of system chunks does not happen through this function. A task that 36562bb2e00eSFilipe Manana * needs to update the chunk btree (the only btree that uses system chunks), must 36572bb2e00eSFilipe Manana * preallocate chunk space by calling either check_system_chunk() or 36582bb2e00eSFilipe Manana * btrfs_reserve_chunk_metadata() - the former is used when allocating a data or 36592bb2e00eSFilipe Manana * metadata chunk or when removing a chunk, while the later is used before doing 36602bb2e00eSFilipe Manana * a modification to the chunk btree - use cases for the later are adding, 36612bb2e00eSFilipe Manana * removing and resizing a device as well as relocation of a system chunk. 36622bb2e00eSFilipe Manana * See the comment below for more details. 366379bd3712SFilipe Manana * 366479bd3712SFilipe Manana * The reservation of system space, done through check_system_chunk(), as well 366579bd3712SFilipe Manana * as all the updates and insertions into the chunk btree must be done while 366679bd3712SFilipe Manana * holding fs_info->chunk_mutex. This is important to guarantee that while COWing 366779bd3712SFilipe Manana * an extent buffer from the chunks btree we never trigger allocation of a new 366879bd3712SFilipe Manana * system chunk, which would result in a deadlock (trying to lock twice an 366979bd3712SFilipe Manana * extent buffer of the chunk btree, first time before triggering the chunk 367079bd3712SFilipe Manana * allocation and the second time during chunk allocation while attempting to 367179bd3712SFilipe Manana * update the chunks btree). The system chunk array is also updated while holding 367279bd3712SFilipe Manana * that mutex. The same logic applies to removing chunks - we must reserve system 367379bd3712SFilipe Manana * space, update the chunk btree and the system chunk array in the superblock 367479bd3712SFilipe Manana * while holding fs_info->chunk_mutex. 367579bd3712SFilipe Manana * 367679bd3712SFilipe Manana * This function, btrfs_chunk_alloc(), belongs to phase 1. 367779bd3712SFilipe Manana * 367879bd3712SFilipe Manana * If @force is CHUNK_ALLOC_FORCE: 367907730d87SJosef Bacik * - return 1 if it successfully allocates a chunk, 368007730d87SJosef Bacik * - return errors including -ENOSPC otherwise. 368179bd3712SFilipe Manana * If @force is NOT CHUNK_ALLOC_FORCE: 368207730d87SJosef Bacik * - return 0 if it doesn't need to allocate a new chunk, 368307730d87SJosef Bacik * - return 1 if it successfully allocates a chunk, 368407730d87SJosef Bacik * - return errors including -ENOSPC otherwise. 368507730d87SJosef Bacik */ 368607730d87SJosef Bacik int btrfs_chunk_alloc(struct btrfs_trans_handle *trans, u64 flags, 368707730d87SJosef Bacik enum btrfs_chunk_alloc_enum force) 368807730d87SJosef Bacik { 368907730d87SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 369007730d87SJosef Bacik struct btrfs_space_info *space_info; 3691820c363bSNaohiro Aota struct btrfs_block_group *ret_bg; 369207730d87SJosef Bacik bool wait_for_alloc = false; 369307730d87SJosef Bacik bool should_alloc = false; 3694760e69c4SNaohiro Aota bool from_extent_allocation = false; 369507730d87SJosef Bacik int ret = 0; 369607730d87SJosef Bacik 3697760e69c4SNaohiro Aota if (force == CHUNK_ALLOC_FORCE_FOR_EXTENT) { 3698760e69c4SNaohiro Aota from_extent_allocation = true; 3699760e69c4SNaohiro Aota force = CHUNK_ALLOC_FORCE; 3700760e69c4SNaohiro Aota } 3701760e69c4SNaohiro Aota 370207730d87SJosef Bacik /* Don't re-enter if we're already allocating a chunk */ 370307730d87SJosef Bacik if (trans->allocating_chunk) 370407730d87SJosef Bacik return -ENOSPC; 370579bd3712SFilipe Manana /* 37062bb2e00eSFilipe Manana * Allocation of system chunks can not happen through this path, as we 37072bb2e00eSFilipe Manana * could end up in a deadlock if we are allocating a data or metadata 37082bb2e00eSFilipe Manana * chunk and there is another task modifying the chunk btree. 37092bb2e00eSFilipe Manana * 37102bb2e00eSFilipe Manana * This is because while we are holding the chunk mutex, we will attempt 37112bb2e00eSFilipe Manana * to add the new chunk item to the chunk btree or update an existing 37122bb2e00eSFilipe Manana * device item in the chunk btree, while the other task that is modifying 37132bb2e00eSFilipe Manana * the chunk btree is attempting to COW an extent buffer while holding a 37142bb2e00eSFilipe Manana * lock on it and on its parent - if the COW operation triggers a system 37152bb2e00eSFilipe Manana * chunk allocation, then we can deadlock because we are holding the 37162bb2e00eSFilipe Manana * chunk mutex and we may need to access that extent buffer or its parent 37172bb2e00eSFilipe Manana * in order to add the chunk item or update a device item. 37182bb2e00eSFilipe Manana * 37192bb2e00eSFilipe Manana * Tasks that want to modify the chunk tree should reserve system space 37202bb2e00eSFilipe Manana * before updating the chunk btree, by calling either 37212bb2e00eSFilipe Manana * btrfs_reserve_chunk_metadata() or check_system_chunk(). 37222bb2e00eSFilipe Manana * It's possible that after a task reserves the space, it still ends up 37232bb2e00eSFilipe Manana * here - this happens in the cases described above at do_chunk_alloc(). 37242bb2e00eSFilipe Manana * The task will have to either retry or fail. 372579bd3712SFilipe Manana */ 37262bb2e00eSFilipe Manana if (flags & BTRFS_BLOCK_GROUP_SYSTEM) 372779bd3712SFilipe Manana return -ENOSPC; 372807730d87SJosef Bacik 372907730d87SJosef Bacik space_info = btrfs_find_space_info(fs_info, flags); 373007730d87SJosef Bacik ASSERT(space_info); 373107730d87SJosef Bacik 373207730d87SJosef Bacik do { 373307730d87SJosef Bacik spin_lock(&space_info->lock); 373407730d87SJosef Bacik if (force < space_info->force_alloc) 373507730d87SJosef Bacik force = space_info->force_alloc; 373607730d87SJosef Bacik should_alloc = should_alloc_chunk(fs_info, space_info, force); 373707730d87SJosef Bacik if (space_info->full) { 373807730d87SJosef Bacik /* No more free physical space */ 373907730d87SJosef Bacik if (should_alloc) 374007730d87SJosef Bacik ret = -ENOSPC; 374107730d87SJosef Bacik else 374207730d87SJosef Bacik ret = 0; 374307730d87SJosef Bacik spin_unlock(&space_info->lock); 374407730d87SJosef Bacik return ret; 374507730d87SJosef Bacik } else if (!should_alloc) { 374607730d87SJosef Bacik spin_unlock(&space_info->lock); 374707730d87SJosef Bacik return 0; 374807730d87SJosef Bacik } else if (space_info->chunk_alloc) { 374907730d87SJosef Bacik /* 375007730d87SJosef Bacik * Someone is already allocating, so we need to block 375107730d87SJosef Bacik * until this someone is finished and then loop to 375207730d87SJosef Bacik * recheck if we should continue with our allocation 375307730d87SJosef Bacik * attempt. 375407730d87SJosef Bacik */ 375507730d87SJosef Bacik wait_for_alloc = true; 375607730d87SJosef Bacik spin_unlock(&space_info->lock); 375707730d87SJosef Bacik mutex_lock(&fs_info->chunk_mutex); 375807730d87SJosef Bacik mutex_unlock(&fs_info->chunk_mutex); 375907730d87SJosef Bacik } else { 376007730d87SJosef Bacik /* Proceed with allocation */ 376107730d87SJosef Bacik space_info->chunk_alloc = 1; 376207730d87SJosef Bacik wait_for_alloc = false; 376307730d87SJosef Bacik spin_unlock(&space_info->lock); 376407730d87SJosef Bacik } 376507730d87SJosef Bacik 376607730d87SJosef Bacik cond_resched(); 376707730d87SJosef Bacik } while (wait_for_alloc); 376807730d87SJosef Bacik 376907730d87SJosef Bacik mutex_lock(&fs_info->chunk_mutex); 377007730d87SJosef Bacik trans->allocating_chunk = true; 377107730d87SJosef Bacik 377207730d87SJosef Bacik /* 377307730d87SJosef Bacik * If we have mixed data/metadata chunks we want to make sure we keep 377407730d87SJosef Bacik * allocating mixed chunks instead of individual chunks. 377507730d87SJosef Bacik */ 377607730d87SJosef Bacik if (btrfs_mixed_space_info(space_info)) 377707730d87SJosef Bacik flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA); 377807730d87SJosef Bacik 377907730d87SJosef Bacik /* 378007730d87SJosef Bacik * if we're doing a data chunk, go ahead and make sure that 378107730d87SJosef Bacik * we keep a reasonable number of metadata chunks allocated in the 378207730d87SJosef Bacik * FS as well. 378307730d87SJosef Bacik */ 378407730d87SJosef Bacik if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) { 378507730d87SJosef Bacik fs_info->data_chunk_allocations++; 378607730d87SJosef Bacik if (!(fs_info->data_chunk_allocations % 378707730d87SJosef Bacik fs_info->metadata_ratio)) 378807730d87SJosef Bacik force_metadata_allocation(fs_info); 378907730d87SJosef Bacik } 379007730d87SJosef Bacik 3791820c363bSNaohiro Aota ret_bg = do_chunk_alloc(trans, flags); 379207730d87SJosef Bacik trans->allocating_chunk = false; 379307730d87SJosef Bacik 3794760e69c4SNaohiro Aota if (IS_ERR(ret_bg)) { 3795820c363bSNaohiro Aota ret = PTR_ERR(ret_bg); 3796760e69c4SNaohiro Aota } else if (from_extent_allocation) { 3797760e69c4SNaohiro Aota /* 3798760e69c4SNaohiro Aota * New block group is likely to be used soon. Try to activate 3799760e69c4SNaohiro Aota * it now. Failure is OK for now. 3800760e69c4SNaohiro Aota */ 3801760e69c4SNaohiro Aota btrfs_zone_activate(ret_bg); 3802760e69c4SNaohiro Aota } 3803760e69c4SNaohiro Aota 3804760e69c4SNaohiro Aota if (!ret) 3805820c363bSNaohiro Aota btrfs_put_block_group(ret_bg); 3806820c363bSNaohiro Aota 380707730d87SJosef Bacik spin_lock(&space_info->lock); 380807730d87SJosef Bacik if (ret < 0) { 380907730d87SJosef Bacik if (ret == -ENOSPC) 381007730d87SJosef Bacik space_info->full = 1; 381107730d87SJosef Bacik else 381207730d87SJosef Bacik goto out; 381307730d87SJosef Bacik } else { 381407730d87SJosef Bacik ret = 1; 381507730d87SJosef Bacik space_info->max_extent_size = 0; 381607730d87SJosef Bacik } 381707730d87SJosef Bacik 381807730d87SJosef Bacik space_info->force_alloc = CHUNK_ALLOC_NO_FORCE; 381907730d87SJosef Bacik out: 382007730d87SJosef Bacik space_info->chunk_alloc = 0; 382107730d87SJosef Bacik spin_unlock(&space_info->lock); 382207730d87SJosef Bacik mutex_unlock(&fs_info->chunk_mutex); 382307730d87SJosef Bacik 382407730d87SJosef Bacik return ret; 382507730d87SJosef Bacik } 382607730d87SJosef Bacik 382707730d87SJosef Bacik static u64 get_profile_num_devs(struct btrfs_fs_info *fs_info, u64 type) 382807730d87SJosef Bacik { 382907730d87SJosef Bacik u64 num_dev; 383007730d87SJosef Bacik 383107730d87SJosef Bacik num_dev = btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)].devs_max; 383207730d87SJosef Bacik if (!num_dev) 383307730d87SJosef Bacik num_dev = fs_info->fs_devices->rw_devices; 383407730d87SJosef Bacik 383507730d87SJosef Bacik return num_dev; 383607730d87SJosef Bacik } 383707730d87SJosef Bacik 38382bb2e00eSFilipe Manana static void reserve_chunk_space(struct btrfs_trans_handle *trans, 38392bb2e00eSFilipe Manana u64 bytes, 38402bb2e00eSFilipe Manana u64 type) 384107730d87SJosef Bacik { 384207730d87SJosef Bacik struct btrfs_fs_info *fs_info = trans->fs_info; 384307730d87SJosef Bacik struct btrfs_space_info *info; 384407730d87SJosef Bacik u64 left; 384507730d87SJosef Bacik int ret = 0; 384607730d87SJosef Bacik 384707730d87SJosef Bacik /* 384807730d87SJosef Bacik * Needed because we can end up allocating a system chunk and for an 384907730d87SJosef Bacik * atomic and race free space reservation in the chunk block reserve. 385007730d87SJosef Bacik */ 385107730d87SJosef Bacik lockdep_assert_held(&fs_info->chunk_mutex); 385207730d87SJosef Bacik 385307730d87SJosef Bacik info = btrfs_find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM); 385407730d87SJosef Bacik spin_lock(&info->lock); 385507730d87SJosef Bacik left = info->total_bytes - btrfs_space_info_used(info, true); 385607730d87SJosef Bacik spin_unlock(&info->lock); 385707730d87SJosef Bacik 38582bb2e00eSFilipe Manana if (left < bytes && btrfs_test_opt(fs_info, ENOSPC_DEBUG)) { 385907730d87SJosef Bacik btrfs_info(fs_info, "left=%llu, need=%llu, flags=%llu", 38602bb2e00eSFilipe Manana left, bytes, type); 386107730d87SJosef Bacik btrfs_dump_space_info(fs_info, info, 0, 0); 386207730d87SJosef Bacik } 386307730d87SJosef Bacik 38642bb2e00eSFilipe Manana if (left < bytes) { 386507730d87SJosef Bacik u64 flags = btrfs_system_alloc_profile(fs_info); 386679bd3712SFilipe Manana struct btrfs_block_group *bg; 386707730d87SJosef Bacik 386807730d87SJosef Bacik /* 386907730d87SJosef Bacik * Ignore failure to create system chunk. We might end up not 387007730d87SJosef Bacik * needing it, as we might not need to COW all nodes/leafs from 387107730d87SJosef Bacik * the paths we visit in the chunk tree (they were already COWed 387207730d87SJosef Bacik * or created in the current transaction for example). 387307730d87SJosef Bacik */ 3874f6f39f7aSNikolay Borisov bg = btrfs_create_chunk(trans, flags); 387579bd3712SFilipe Manana if (IS_ERR(bg)) { 387679bd3712SFilipe Manana ret = PTR_ERR(bg); 38772bb2e00eSFilipe Manana } else { 387879bd3712SFilipe Manana /* 387979bd3712SFilipe Manana * If we fail to add the chunk item here, we end up 388079bd3712SFilipe Manana * trying again at phase 2 of chunk allocation, at 388179bd3712SFilipe Manana * btrfs_create_pending_block_groups(). So ignore 38822bb2e00eSFilipe Manana * any error here. An ENOSPC here could happen, due to 38832bb2e00eSFilipe Manana * the cases described at do_chunk_alloc() - the system 38842bb2e00eSFilipe Manana * block group we just created was just turned into RO 38852bb2e00eSFilipe Manana * mode by a scrub for example, or a running discard 38862bb2e00eSFilipe Manana * temporarily removed its free space entries, etc. 388779bd3712SFilipe Manana */ 388879bd3712SFilipe Manana btrfs_chunk_alloc_add_chunk_item(trans, bg); 388979bd3712SFilipe Manana } 389007730d87SJosef Bacik } 389107730d87SJosef Bacik 389207730d87SJosef Bacik if (!ret) { 38939270501cSJosef Bacik ret = btrfs_block_rsv_add(fs_info, 389407730d87SJosef Bacik &fs_info->chunk_block_rsv, 38952bb2e00eSFilipe Manana bytes, BTRFS_RESERVE_NO_FLUSH); 38961cb3db1cSFilipe Manana if (!ret) 38972bb2e00eSFilipe Manana trans->chunk_bytes_reserved += bytes; 389807730d87SJosef Bacik } 389907730d87SJosef Bacik } 390007730d87SJosef Bacik 39012bb2e00eSFilipe Manana /* 39022bb2e00eSFilipe Manana * Reserve space in the system space for allocating or removing a chunk. 39032bb2e00eSFilipe Manana * The caller must be holding fs_info->chunk_mutex. 39042bb2e00eSFilipe Manana */ 39052bb2e00eSFilipe Manana void check_system_chunk(struct btrfs_trans_handle *trans, u64 type) 39062bb2e00eSFilipe Manana { 39072bb2e00eSFilipe Manana struct btrfs_fs_info *fs_info = trans->fs_info; 39082bb2e00eSFilipe Manana const u64 num_devs = get_profile_num_devs(fs_info, type); 39092bb2e00eSFilipe Manana u64 bytes; 39102bb2e00eSFilipe Manana 39112bb2e00eSFilipe Manana /* num_devs device items to update and 1 chunk item to add or remove. */ 39122bb2e00eSFilipe Manana bytes = btrfs_calc_metadata_size(fs_info, num_devs) + 39132bb2e00eSFilipe Manana btrfs_calc_insert_metadata_size(fs_info, 1); 39142bb2e00eSFilipe Manana 39152bb2e00eSFilipe Manana reserve_chunk_space(trans, bytes, type); 39162bb2e00eSFilipe Manana } 39172bb2e00eSFilipe Manana 39182bb2e00eSFilipe Manana /* 39192bb2e00eSFilipe Manana * Reserve space in the system space, if needed, for doing a modification to the 39202bb2e00eSFilipe Manana * chunk btree. 39212bb2e00eSFilipe Manana * 39222bb2e00eSFilipe Manana * @trans: A transaction handle. 39232bb2e00eSFilipe Manana * @is_item_insertion: Indicate if the modification is for inserting a new item 39242bb2e00eSFilipe Manana * in the chunk btree or if it's for the deletion or update 39252bb2e00eSFilipe Manana * of an existing item. 39262bb2e00eSFilipe Manana * 39272bb2e00eSFilipe Manana * This is used in a context where we need to update the chunk btree outside 39282bb2e00eSFilipe Manana * block group allocation and removal, to avoid a deadlock with a concurrent 39292bb2e00eSFilipe Manana * task that is allocating a metadata or data block group and therefore needs to 39302bb2e00eSFilipe Manana * update the chunk btree while holding the chunk mutex. After the update to the 39312bb2e00eSFilipe Manana * chunk btree is done, btrfs_trans_release_chunk_metadata() should be called. 39322bb2e00eSFilipe Manana * 39332bb2e00eSFilipe Manana */ 39342bb2e00eSFilipe Manana void btrfs_reserve_chunk_metadata(struct btrfs_trans_handle *trans, 39352bb2e00eSFilipe Manana bool is_item_insertion) 39362bb2e00eSFilipe Manana { 39372bb2e00eSFilipe Manana struct btrfs_fs_info *fs_info = trans->fs_info; 39382bb2e00eSFilipe Manana u64 bytes; 39392bb2e00eSFilipe Manana 39402bb2e00eSFilipe Manana if (is_item_insertion) 39412bb2e00eSFilipe Manana bytes = btrfs_calc_insert_metadata_size(fs_info, 1); 39422bb2e00eSFilipe Manana else 39432bb2e00eSFilipe Manana bytes = btrfs_calc_metadata_size(fs_info, 1); 39442bb2e00eSFilipe Manana 39452bb2e00eSFilipe Manana mutex_lock(&fs_info->chunk_mutex); 39462bb2e00eSFilipe Manana reserve_chunk_space(trans, bytes, BTRFS_BLOCK_GROUP_SYSTEM); 39472bb2e00eSFilipe Manana mutex_unlock(&fs_info->chunk_mutex); 39482bb2e00eSFilipe Manana } 39492bb2e00eSFilipe Manana 39503e43c279SJosef Bacik void btrfs_put_block_group_cache(struct btrfs_fs_info *info) 39513e43c279SJosef Bacik { 395232da5386SDavid Sterba struct btrfs_block_group *block_group; 39533e43c279SJosef Bacik u64 last = 0; 39543e43c279SJosef Bacik 39553e43c279SJosef Bacik while (1) { 39563e43c279SJosef Bacik struct inode *inode; 39573e43c279SJosef Bacik 39583e43c279SJosef Bacik block_group = btrfs_lookup_first_block_group(info, last); 39593e43c279SJosef Bacik while (block_group) { 39603e43c279SJosef Bacik btrfs_wait_block_group_cache_done(block_group); 39613e43c279SJosef Bacik spin_lock(&block_group->lock); 39623e43c279SJosef Bacik if (block_group->iref) 39633e43c279SJosef Bacik break; 39643e43c279SJosef Bacik spin_unlock(&block_group->lock); 39653e43c279SJosef Bacik block_group = btrfs_next_block_group(block_group); 39663e43c279SJosef Bacik } 39673e43c279SJosef Bacik if (!block_group) { 39683e43c279SJosef Bacik if (last == 0) 39693e43c279SJosef Bacik break; 39703e43c279SJosef Bacik last = 0; 39713e43c279SJosef Bacik continue; 39723e43c279SJosef Bacik } 39733e43c279SJosef Bacik 39743e43c279SJosef Bacik inode = block_group->inode; 39753e43c279SJosef Bacik block_group->iref = 0; 39763e43c279SJosef Bacik block_group->inode = NULL; 39773e43c279SJosef Bacik spin_unlock(&block_group->lock); 39783e43c279SJosef Bacik ASSERT(block_group->io_ctl.inode == NULL); 39793e43c279SJosef Bacik iput(inode); 3980b3470b5dSDavid Sterba last = block_group->start + block_group->length; 39813e43c279SJosef Bacik btrfs_put_block_group(block_group); 39823e43c279SJosef Bacik } 39833e43c279SJosef Bacik } 39843e43c279SJosef Bacik 39853e43c279SJosef Bacik /* 39863e43c279SJosef Bacik * Must be called only after stopping all workers, since we could have block 39873e43c279SJosef Bacik * group caching kthreads running, and therefore they could race with us if we 39883e43c279SJosef Bacik * freed the block groups before stopping them. 39893e43c279SJosef Bacik */ 39903e43c279SJosef Bacik int btrfs_free_block_groups(struct btrfs_fs_info *info) 39913e43c279SJosef Bacik { 399232da5386SDavid Sterba struct btrfs_block_group *block_group; 39933e43c279SJosef Bacik struct btrfs_space_info *space_info; 39943e43c279SJosef Bacik struct btrfs_caching_control *caching_ctl; 39953e43c279SJosef Bacik struct rb_node *n; 39963e43c279SJosef Bacik 399716b0c258SFilipe Manana write_lock(&info->block_group_cache_lock); 39983e43c279SJosef Bacik while (!list_empty(&info->caching_block_groups)) { 39993e43c279SJosef Bacik caching_ctl = list_entry(info->caching_block_groups.next, 40003e43c279SJosef Bacik struct btrfs_caching_control, list); 40013e43c279SJosef Bacik list_del(&caching_ctl->list); 40023e43c279SJosef Bacik btrfs_put_caching_control(caching_ctl); 40033e43c279SJosef Bacik } 400416b0c258SFilipe Manana write_unlock(&info->block_group_cache_lock); 40053e43c279SJosef Bacik 40063e43c279SJosef Bacik spin_lock(&info->unused_bgs_lock); 40073e43c279SJosef Bacik while (!list_empty(&info->unused_bgs)) { 40083e43c279SJosef Bacik block_group = list_first_entry(&info->unused_bgs, 400932da5386SDavid Sterba struct btrfs_block_group, 40103e43c279SJosef Bacik bg_list); 40113e43c279SJosef Bacik list_del_init(&block_group->bg_list); 40123e43c279SJosef Bacik btrfs_put_block_group(block_group); 40133e43c279SJosef Bacik } 40143e43c279SJosef Bacik 401518bb8bbfSJohannes Thumshirn while (!list_empty(&info->reclaim_bgs)) { 401618bb8bbfSJohannes Thumshirn block_group = list_first_entry(&info->reclaim_bgs, 401718bb8bbfSJohannes Thumshirn struct btrfs_block_group, 401818bb8bbfSJohannes Thumshirn bg_list); 401918bb8bbfSJohannes Thumshirn list_del_init(&block_group->bg_list); 402018bb8bbfSJohannes Thumshirn btrfs_put_block_group(block_group); 402118bb8bbfSJohannes Thumshirn } 402218bb8bbfSJohannes Thumshirn spin_unlock(&info->unused_bgs_lock); 402318bb8bbfSJohannes Thumshirn 4024afba2bc0SNaohiro Aota spin_lock(&info->zone_active_bgs_lock); 4025afba2bc0SNaohiro Aota while (!list_empty(&info->zone_active_bgs)) { 4026afba2bc0SNaohiro Aota block_group = list_first_entry(&info->zone_active_bgs, 4027afba2bc0SNaohiro Aota struct btrfs_block_group, 4028afba2bc0SNaohiro Aota active_bg_list); 4029afba2bc0SNaohiro Aota list_del_init(&block_group->active_bg_list); 4030afba2bc0SNaohiro Aota btrfs_put_block_group(block_group); 4031afba2bc0SNaohiro Aota } 4032afba2bc0SNaohiro Aota spin_unlock(&info->zone_active_bgs_lock); 4033afba2bc0SNaohiro Aota 403416b0c258SFilipe Manana write_lock(&info->block_group_cache_lock); 403508dddb29SFilipe Manana while ((n = rb_last(&info->block_group_cache_tree.rb_root)) != NULL) { 403632da5386SDavid Sterba block_group = rb_entry(n, struct btrfs_block_group, 40373e43c279SJosef Bacik cache_node); 403808dddb29SFilipe Manana rb_erase_cached(&block_group->cache_node, 40393e43c279SJosef Bacik &info->block_group_cache_tree); 40403e43c279SJosef Bacik RB_CLEAR_NODE(&block_group->cache_node); 404116b0c258SFilipe Manana write_unlock(&info->block_group_cache_lock); 40423e43c279SJosef Bacik 40433e43c279SJosef Bacik down_write(&block_group->space_info->groups_sem); 40443e43c279SJosef Bacik list_del(&block_group->list); 40453e43c279SJosef Bacik up_write(&block_group->space_info->groups_sem); 40463e43c279SJosef Bacik 40473e43c279SJosef Bacik /* 40483e43c279SJosef Bacik * We haven't cached this block group, which means we could 40493e43c279SJosef Bacik * possibly have excluded extents on this block group. 40503e43c279SJosef Bacik */ 40513e43c279SJosef Bacik if (block_group->cached == BTRFS_CACHE_NO || 40523e43c279SJosef Bacik block_group->cached == BTRFS_CACHE_ERROR) 40533e43c279SJosef Bacik btrfs_free_excluded_extents(block_group); 40543e43c279SJosef Bacik 40553e43c279SJosef Bacik btrfs_remove_free_space_cache(block_group); 40563e43c279SJosef Bacik ASSERT(block_group->cached != BTRFS_CACHE_STARTED); 40573e43c279SJosef Bacik ASSERT(list_empty(&block_group->dirty_list)); 40583e43c279SJosef Bacik ASSERT(list_empty(&block_group->io_list)); 40593e43c279SJosef Bacik ASSERT(list_empty(&block_group->bg_list)); 406048aaeebeSJosef Bacik ASSERT(refcount_read(&block_group->refs) == 1); 4061195a49eaSFilipe Manana ASSERT(block_group->swap_extents == 0); 40623e43c279SJosef Bacik btrfs_put_block_group(block_group); 40633e43c279SJosef Bacik 406416b0c258SFilipe Manana write_lock(&info->block_group_cache_lock); 40653e43c279SJosef Bacik } 406616b0c258SFilipe Manana write_unlock(&info->block_group_cache_lock); 40673e43c279SJosef Bacik 40683e43c279SJosef Bacik btrfs_release_global_block_rsv(info); 40693e43c279SJosef Bacik 40703e43c279SJosef Bacik while (!list_empty(&info->space_info)) { 40713e43c279SJosef Bacik space_info = list_entry(info->space_info.next, 40723e43c279SJosef Bacik struct btrfs_space_info, 40733e43c279SJosef Bacik list); 40743e43c279SJosef Bacik 40753e43c279SJosef Bacik /* 40763e43c279SJosef Bacik * Do not hide this behind enospc_debug, this is actually 40773e43c279SJosef Bacik * important and indicates a real bug if this happens. 40783e43c279SJosef Bacik */ 40793e43c279SJosef Bacik if (WARN_ON(space_info->bytes_pinned > 0 || 40803e43c279SJosef Bacik space_info->bytes_may_use > 0)) 40813e43c279SJosef Bacik btrfs_dump_space_info(info, space_info, 0, 0); 408240cdc509SFilipe Manana 408340cdc509SFilipe Manana /* 408440cdc509SFilipe Manana * If there was a failure to cleanup a log tree, very likely due 408540cdc509SFilipe Manana * to an IO failure on a writeback attempt of one or more of its 408640cdc509SFilipe Manana * extent buffers, we could not do proper (and cheap) unaccounting 408740cdc509SFilipe Manana * of their reserved space, so don't warn on bytes_reserved > 0 in 408840cdc509SFilipe Manana * that case. 408940cdc509SFilipe Manana */ 409040cdc509SFilipe Manana if (!(space_info->flags & BTRFS_BLOCK_GROUP_METADATA) || 409140cdc509SFilipe Manana !BTRFS_FS_LOG_CLEANUP_ERROR(info)) { 409240cdc509SFilipe Manana if (WARN_ON(space_info->bytes_reserved > 0)) 409340cdc509SFilipe Manana btrfs_dump_space_info(info, space_info, 0, 0); 409440cdc509SFilipe Manana } 409540cdc509SFilipe Manana 4096d611add4SFilipe Manana WARN_ON(space_info->reclaim_size > 0); 40973e43c279SJosef Bacik list_del(&space_info->list); 40983e43c279SJosef Bacik btrfs_sysfs_remove_space_info(space_info); 40993e43c279SJosef Bacik } 41003e43c279SJosef Bacik return 0; 41013e43c279SJosef Bacik } 4102684b752bSFilipe Manana 4103684b752bSFilipe Manana void btrfs_freeze_block_group(struct btrfs_block_group *cache) 4104684b752bSFilipe Manana { 4105684b752bSFilipe Manana atomic_inc(&cache->frozen); 4106684b752bSFilipe Manana } 4107684b752bSFilipe Manana 4108684b752bSFilipe Manana void btrfs_unfreeze_block_group(struct btrfs_block_group *block_group) 4109684b752bSFilipe Manana { 4110684b752bSFilipe Manana struct btrfs_fs_info *fs_info = block_group->fs_info; 4111684b752bSFilipe Manana struct extent_map_tree *em_tree; 4112684b752bSFilipe Manana struct extent_map *em; 4113684b752bSFilipe Manana bool cleanup; 4114684b752bSFilipe Manana 4115684b752bSFilipe Manana spin_lock(&block_group->lock); 4116684b752bSFilipe Manana cleanup = (atomic_dec_and_test(&block_group->frozen) && 4117684b752bSFilipe Manana block_group->removed); 4118684b752bSFilipe Manana spin_unlock(&block_group->lock); 4119684b752bSFilipe Manana 4120684b752bSFilipe Manana if (cleanup) { 4121684b752bSFilipe Manana em_tree = &fs_info->mapping_tree; 4122684b752bSFilipe Manana write_lock(&em_tree->lock); 4123684b752bSFilipe Manana em = lookup_extent_mapping(em_tree, block_group->start, 4124684b752bSFilipe Manana 1); 4125684b752bSFilipe Manana BUG_ON(!em); /* logic error, can't happen */ 4126684b752bSFilipe Manana remove_extent_mapping(em_tree, em); 4127684b752bSFilipe Manana write_unlock(&em_tree->lock); 4128684b752bSFilipe Manana 4129684b752bSFilipe Manana /* once for us and once for the tree */ 4130684b752bSFilipe Manana free_extent_map(em); 4131684b752bSFilipe Manana free_extent_map(em); 4132684b752bSFilipe Manana 4133684b752bSFilipe Manana /* 4134684b752bSFilipe Manana * We may have left one free space entry and other possible 4135684b752bSFilipe Manana * tasks trimming this block group have left 1 entry each one. 4136684b752bSFilipe Manana * Free them if any. 4137684b752bSFilipe Manana */ 4138684b752bSFilipe Manana __btrfs_remove_free_space_cache(block_group->free_space_ctl); 4139684b752bSFilipe Manana } 4140684b752bSFilipe Manana } 4141195a49eaSFilipe Manana 4142195a49eaSFilipe Manana bool btrfs_inc_block_group_swap_extents(struct btrfs_block_group *bg) 4143195a49eaSFilipe Manana { 4144195a49eaSFilipe Manana bool ret = true; 4145195a49eaSFilipe Manana 4146195a49eaSFilipe Manana spin_lock(&bg->lock); 4147195a49eaSFilipe Manana if (bg->ro) 4148195a49eaSFilipe Manana ret = false; 4149195a49eaSFilipe Manana else 4150195a49eaSFilipe Manana bg->swap_extents++; 4151195a49eaSFilipe Manana spin_unlock(&bg->lock); 4152195a49eaSFilipe Manana 4153195a49eaSFilipe Manana return ret; 4154195a49eaSFilipe Manana } 4155195a49eaSFilipe Manana 4156195a49eaSFilipe Manana void btrfs_dec_block_group_swap_extents(struct btrfs_block_group *bg, int amount) 4157195a49eaSFilipe Manana { 4158195a49eaSFilipe Manana spin_lock(&bg->lock); 4159195a49eaSFilipe Manana ASSERT(!bg->ro); 4160195a49eaSFilipe Manana ASSERT(bg->swap_extents >= amount); 4161195a49eaSFilipe Manana bg->swap_extents -= amount; 4162195a49eaSFilipe Manana spin_unlock(&bg->lock); 4163195a49eaSFilipe Manana } 4164