16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 194b82d6e4SYan #include <linux/blkdev.h> 202e635a27SChris Mason #include <linux/module.h> 21e20d96d6SChris Mason #include <linux/buffer_head.h> 222e635a27SChris Mason #include <linux/fs.h> 232e635a27SChris Mason #include <linux/pagemap.h> 242e635a27SChris Mason #include <linux/highmem.h> 252e635a27SChris Mason #include <linux/time.h> 262e635a27SChris Mason #include <linux/init.h> 27a9572a15SEric Paris #include <linux/seq_file.h> 282e635a27SChris Mason #include <linux/string.h> 292e635a27SChris Mason #include <linux/backing-dev.h> 304b82d6e4SYan #include <linux/mount.h> 31dee26a9fSChris Mason #include <linux/mpage.h> 3275dfe396SChris Mason #include <linux/swap.h> 3375dfe396SChris Mason #include <linux/writeback.h> 348fd17795SChris Mason #include <linux/statfs.h> 3508607c1bSChris Mason #include <linux/compat.h> 3695e05289SChris Mason #include <linux/parser.h> 37c59f8951SChris Mason #include <linux/ctype.h> 386da6abaeSChris Mason #include <linux/namei.h> 39a9218f6bSChris Mason #include <linux/miscdevice.h> 401bcbf313SQinghuang Feng #include <linux/magic.h> 415a0e3ad6STejun Heo #include <linux/slab.h> 4290a887c9SDan Magenheimer #include <linux/cleancache.h> 4322c44fe6SJosef Bacik #include <linux/ratelimit.h> 4455e301fdSFilipe Brandenburger #include <linux/btrfs.h> 4516cdcec7SMiao Xie #include "delayed-inode.h" 462e635a27SChris Mason #include "ctree.h" 47e20d96d6SChris Mason #include "disk-io.h" 48d5719762SChris Mason #include "transaction.h" 492c90e5d6SChris Mason #include "btrfs_inode.h" 503a686375SChris Mason #include "print-tree.h" 5114a958e6SFilipe David Borba Manana #include "hash.h" 5263541927SFilipe David Borba Manana #include "props.h" 535103e947SJosef Bacik #include "xattr.h" 548a4b83ccSChris Mason #include "volumes.h" 55be6e8dc0SBalaji Rao #include "export.h" 56c8b97818SChris Mason #include "compression.h" 579c5085c1SJosef Bacik #include "rcu-string.h" 588dabb742SStefan Behrens #include "dev-replace.h" 5974255aa0SJosef Bacik #include "free-space-cache.h" 60b9e9a6cbSWang Shilong #include "backref.h" 61dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 622e635a27SChris Mason 63d3982100SMark Fasheh #include "qgroup.h" 641abe9b8aSliubo #define CREATE_TRACE_POINTS 651abe9b8aSliubo #include <trace/events/btrfs.h> 661abe9b8aSliubo 67b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 68830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 69e20d96d6SChris Mason 700723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 710723a047SHarald Hoyer 72e33e17eeSJeff Mahoney const char *btrfs_decode_error(int errno) 73acce952bSliubo { 7408748810SDavid Sterba char *errstr = "unknown"; 75acce952bSliubo 76acce952bSliubo switch (errno) { 77acce952bSliubo case -EIO: 78acce952bSliubo errstr = "IO failure"; 79acce952bSliubo break; 80acce952bSliubo case -ENOMEM: 81acce952bSliubo errstr = "Out of memory"; 82acce952bSliubo break; 83acce952bSliubo case -EROFS: 84acce952bSliubo errstr = "Readonly filesystem"; 85acce952bSliubo break; 868c342930SJeff Mahoney case -EEXIST: 878c342930SJeff Mahoney errstr = "Object already exists"; 888c342930SJeff Mahoney break; 8994ef7280SDavid Sterba case -ENOSPC: 9094ef7280SDavid Sterba errstr = "No space left"; 9194ef7280SDavid Sterba break; 9294ef7280SDavid Sterba case -ENOENT: 9394ef7280SDavid Sterba errstr = "No such entry"; 9494ef7280SDavid Sterba break; 95acce952bSliubo } 96acce952bSliubo 97acce952bSliubo return errstr; 98acce952bSliubo } 99acce952bSliubo 100acce952bSliubo /* btrfs handle error by forcing the filesystem readonly */ 101acce952bSliubo static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 102acce952bSliubo { 103acce952bSliubo struct super_block *sb = fs_info->sb; 104acce952bSliubo 105acce952bSliubo if (sb->s_flags & MS_RDONLY) 106acce952bSliubo return; 107acce952bSliubo 10887533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 109acce952bSliubo sb->s_flags |= MS_RDONLY; 110c2cf52ebSSimon Kirby btrfs_info(fs_info, "forced readonly"); 1111acd6831SStefan Behrens /* 1121acd6831SStefan Behrens * Note that a running device replace operation is not 1131acd6831SStefan Behrens * canceled here although there is no way to update 1141acd6831SStefan Behrens * the progress. It would add the risk of a deadlock, 11501327610SNicholas D Steeves * therefore the canceling is omitted. The only penalty 1161acd6831SStefan Behrens * is that some I/O remains active until the procedure 1171acd6831SStefan Behrens * completes. The next time when the filesystem is 1181acd6831SStefan Behrens * mounted writeable again, the device replace 1191acd6831SStefan Behrens * operation continues. 1201acd6831SStefan Behrens */ 121acce952bSliubo } 122acce952bSliubo } 123acce952bSliubo 124acce952bSliubo /* 12534d97007SAnand Jain * __btrfs_handle_fs_error decodes expected errors from the caller and 126acce952bSliubo * invokes the approciate error response. 127acce952bSliubo */ 128c0d19e2bSDavid Sterba __cold 12934d97007SAnand Jain void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 1304da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 131acce952bSliubo { 132acce952bSliubo struct super_block *sb = fs_info->sb; 13357d816a1SAnand Jain #ifdef CONFIG_PRINTK 134acce952bSliubo const char *errstr; 13557d816a1SAnand Jain #endif 136acce952bSliubo 137acce952bSliubo /* 138acce952bSliubo * Special case: if the error is EROFS, and we're already 139acce952bSliubo * under MS_RDONLY, then it is safe here. 140acce952bSliubo */ 141acce952bSliubo if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 142acce952bSliubo return; 143acce952bSliubo 14457d816a1SAnand Jain #ifdef CONFIG_PRINTK 14508748810SDavid Sterba errstr = btrfs_decode_error(errno); 1464da35113SJeff Mahoney if (fmt) { 14737252a66SEric Sandeen struct va_format vaf; 14837252a66SEric Sandeen va_list args; 14937252a66SEric Sandeen 15037252a66SEric Sandeen va_start(args, fmt); 15137252a66SEric Sandeen vaf.fmt = fmt; 15237252a66SEric Sandeen vaf.va = &args; 1534da35113SJeff Mahoney 154efe120a0SFrank Holton printk(KERN_CRIT 155efe120a0SFrank Holton "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 15608748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 15737252a66SEric Sandeen va_end(args); 1584da35113SJeff Mahoney } else { 159efe120a0SFrank Holton printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 16008748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1614da35113SJeff Mahoney } 16257d816a1SAnand Jain #endif 163acce952bSliubo 1640713d90cSAnand Jain /* 1650713d90cSAnand Jain * Today we only save the error info to memory. Long term we'll 1660713d90cSAnand Jain * also send it down to the disk 1670713d90cSAnand Jain */ 1680713d90cSAnand Jain set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 1690713d90cSAnand Jain 1704da35113SJeff Mahoney /* Don't go through full error handling during mount */ 171cf79ffb5SJosef Bacik if (sb->s_flags & MS_BORN) 172acce952bSliubo btrfs_handle_error(fs_info); 173acce952bSliubo } 1744da35113SJeff Mahoney 17557d816a1SAnand Jain #ifdef CONFIG_PRINTK 176533574c6SJoe Perches static const char * const logtypes[] = { 1774da35113SJeff Mahoney "emergency", 1784da35113SJeff Mahoney "alert", 1794da35113SJeff Mahoney "critical", 1804da35113SJeff Mahoney "error", 1814da35113SJeff Mahoney "warning", 1824da35113SJeff Mahoney "notice", 1834da35113SJeff Mahoney "info", 1844da35113SJeff Mahoney "debug", 1854da35113SJeff Mahoney }; 1864da35113SJeff Mahoney 187c2cf52ebSSimon Kirby void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 1884da35113SJeff Mahoney { 1894da35113SJeff Mahoney struct super_block *sb = fs_info->sb; 1904da35113SJeff Mahoney char lvl[4]; 1914da35113SJeff Mahoney struct va_format vaf; 1924da35113SJeff Mahoney va_list args; 1934da35113SJeff Mahoney const char *type = logtypes[4]; 194533574c6SJoe Perches int kern_level; 1954da35113SJeff Mahoney 1964da35113SJeff Mahoney va_start(args, fmt); 1974da35113SJeff Mahoney 198533574c6SJoe Perches kern_level = printk_get_level(fmt); 199533574c6SJoe Perches if (kern_level) { 200533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 201533574c6SJoe Perches memcpy(lvl, fmt, size); 202533574c6SJoe Perches lvl[size] = '\0'; 203533574c6SJoe Perches fmt += size; 204533574c6SJoe Perches type = logtypes[kern_level - '0']; 2054da35113SJeff Mahoney } else 2064da35113SJeff Mahoney *lvl = '\0'; 2074da35113SJeff Mahoney 2084da35113SJeff Mahoney vaf.fmt = fmt; 2094da35113SJeff Mahoney vaf.va = &args; 210533574c6SJoe Perches 211c2cf52ebSSimon Kirby printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); 212533574c6SJoe Perches 213533574c6SJoe Perches va_end(args); 2144da35113SJeff Mahoney } 215533574c6SJoe Perches #endif 216533574c6SJoe Perches 2178c342930SJeff Mahoney /* 21849b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 21949b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 22049b25e05SJeff Mahoney * one. 22149b25e05SJeff Mahoney * 22249b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 22349b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 22449b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 22549b25e05SJeff Mahoney * in the call path but will return -EIO. 22649b25e05SJeff Mahoney * 22749b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 22849b25e05SJeff Mahoney * btrfs_commit_transaction. 22949b25e05SJeff Mahoney */ 230c0d19e2bSDavid Sterba __cold 23149b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 23249b25e05SJeff Mahoney struct btrfs_root *root, const char *function, 23349b25e05SJeff Mahoney unsigned int line, int errno) 23449b25e05SJeff Mahoney { 23549b25e05SJeff Mahoney trans->aborted = errno; 23649b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 23749b25e05SJeff Mahoney * transaction may be able to continue. */ 23864c12921SJeff Mahoney if (!trans->dirty && list_empty(&trans->new_bgs)) { 23969ce977aSMiao Xie const char *errstr; 24069ce977aSMiao Xie 24108748810SDavid Sterba errstr = btrfs_decode_error(errno); 242c2cf52ebSSimon Kirby btrfs_warn(root->fs_info, 243c2cf52ebSSimon Kirby "%s:%d: Aborting unused transaction(%s).", 24469ce977aSMiao Xie function, line, errstr); 24549b25e05SJeff Mahoney return; 24649b25e05SJeff Mahoney } 2478d25a086SMiao Xie ACCESS_ONCE(trans->transaction->aborted) = errno; 248501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 249501407aaSJosef Bacik wake_up(&root->fs_info->transaction_wait); 250501407aaSJosef Bacik wake_up(&root->fs_info->transaction_blocked_wait); 25134d97007SAnand Jain __btrfs_handle_fs_error(root->fs_info, function, line, errno, NULL); 25249b25e05SJeff Mahoney } 25349b25e05SJeff Mahoney /* 2548c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2558c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2568c342930SJeff Mahoney */ 257c0d19e2bSDavid Sterba __cold 2588c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2598c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2608c342930SJeff Mahoney { 2618c342930SJeff Mahoney char *s_id = "<unknown>"; 2628c342930SJeff Mahoney const char *errstr; 2638c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2648c342930SJeff Mahoney va_list args; 2658c342930SJeff Mahoney 2668c342930SJeff Mahoney if (fs_info) 2678c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2688c342930SJeff Mahoney 2698c342930SJeff Mahoney va_start(args, fmt); 2708c342930SJeff Mahoney vaf.va = &args; 2718c342930SJeff Mahoney 27208748810SDavid Sterba errstr = btrfs_decode_error(errno); 273aa43a17cSEric Sandeen if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) 27408748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 27508748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 2768c342930SJeff Mahoney 277efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 278efe120a0SFrank Holton function, line, &vaf, errno, errstr); 2798c342930SJeff Mahoney va_end(args); 2808c342930SJeff Mahoney /* Caller calls BUG() */ 2818c342930SJeff Mahoney } 282acce952bSliubo 283e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 284e20d96d6SChris Mason { 2853abdbd78SDavid Sterba close_ctree(btrfs_sb(sb)->tree_root); 286e20d96d6SChris Mason } 2872e635a27SChris Mason 28895e05289SChris Mason enum { 28973f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 290287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 291287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 292261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 293261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 29470f6d82eSOmar Sandoval Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, 29570f6d82eSOmar Sandoval Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, 29670f6d82eSOmar Sandoval Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, 29770f6d82eSOmar Sandoval Opt_skip_balance, Opt_check_integrity, 29870f6d82eSOmar Sandoval Opt_check_integrity_including_extent_data, 299f420ee1eSStefan Behrens Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, 300e07a2adeSQu Wenruo Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, 301a258af7aSQu Wenruo Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, 3028dcddfa0SQu Wenruo Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, 303fed8f166SQu Wenruo Opt_nologreplay, Opt_norecovery, 304d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 305d0bd4560SJosef Bacik Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, 306d0bd4560SJosef Bacik #endif 3079555c6c1SIlya Dryomov Opt_err, 30895e05289SChris Mason }; 30995e05289SChris Mason 3104d4ab6d6SDavid Sterba static const match_table_t tokens = { 311dfe25020SChris Mason {Opt_degraded, "degraded"}, 31295e05289SChris Mason {Opt_subvol, "subvol=%s"}, 3131493381fSWang Shilong {Opt_subvolid, "subvolid=%s"}, 31443e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 315b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 316d399167dSQu Wenruo {Opt_datasum, "datasum"}, 317be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 318a258af7aSQu Wenruo {Opt_datacow, "datacow"}, 31921ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 320842bef58SQu Wenruo {Opt_barrier, "barrier"}, 3216f568d35SChris Mason {Opt_max_inline, "max_inline=%s"}, 3228f662a76SChris Mason {Opt_alloc_start, "alloc_start=%s"}, 3234543df7eSChris Mason {Opt_thread_pool, "thread_pool=%d"}, 324c8b97818SChris Mason {Opt_compress, "compress"}, 325261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 326a555f810SChris Mason {Opt_compress_force, "compress-force"}, 327261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 328e18e4809SChris Mason {Opt_ssd, "ssd"}, 329451d7585SChris Mason {Opt_ssd_spread, "ssd_spread"}, 3303b30c22fSChris Mason {Opt_nossd, "nossd"}, 331bd0330adSQu Wenruo {Opt_acl, "acl"}, 33233268eafSJosef Bacik {Opt_noacl, "noacl"}, 3333a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 334a88998f2SQu Wenruo {Opt_treelog, "treelog"}, 33596da0919SQu Wenruo {Opt_nologreplay, "nologreplay"}, 336fed8f166SQu Wenruo {Opt_norecovery, "norecovery"}, 337dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 3382c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 33997e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 340e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 341e07a2adeSQu Wenruo {Opt_nodiscard, "nodiscard"}, 3420af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 34370f6d82eSOmar Sandoval {Opt_space_cache_version, "space_cache=%s"}, 34488c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3454260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 34691435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 34753036293SQu Wenruo {Opt_noenospc_debug, "noenospc_debug"}, 348e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3494cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 350fc0ca9afSQu Wenruo {Opt_nodefrag, "noautodefrag"}, 3514b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3523818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 3538965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 3548dcddfa0SQu Wenruo {Opt_recovery, "recovery"}, /* deprecated */ 3558dcddfa0SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 3569555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 35721adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 35821adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 35921adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 360f420ee1eSStefan Behrens {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 3618c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 3628b87dc17SDavid Sterba {Opt_commit_interval, "commit=%d"}, 363d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 364d0bd4560SJosef Bacik {Opt_fragment_data, "fragment=data"}, 365d0bd4560SJosef Bacik {Opt_fragment_metadata, "fragment=metadata"}, 366d0bd4560SJosef Bacik {Opt_fragment_all, "fragment=all"}, 367d0bd4560SJosef Bacik #endif 36833268eafSJosef Bacik {Opt_err, NULL}, 36995e05289SChris Mason }; 37095e05289SChris Mason 371edf24abeSChristoph Hellwig /* 372edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 373edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 37449b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 375edf24abeSChristoph Hellwig */ 37696da0919SQu Wenruo int btrfs_parse_options(struct btrfs_root *root, char *options, 37796da0919SQu Wenruo unsigned long new_flags) 37895e05289SChris Mason { 379edf24abeSChristoph Hellwig struct btrfs_fs_info *info = root->fs_info; 38095e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 38173bc1876SJosef Bacik char *p, *num, *orig = NULL; 38273bc1876SJosef Bacik u64 cache_gen; 3834543df7eSChris Mason int intarg; 384a7a3f7caSSage Weil int ret = 0; 385261507a0SLi Zefan char *compress_type; 386261507a0SLi Zefan bool compress_force = false; 387b7c47bbbSTsutomu Itoh enum btrfs_compression_type saved_compress_type; 388b7c47bbbSTsutomu Itoh bool saved_compress_force; 389b7c47bbbSTsutomu Itoh int no_compress = 0; 390b6cda9bcSChris Mason 3916c41761fSDavid Sterba cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 39270f6d82eSOmar Sandoval if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) 39370f6d82eSOmar Sandoval btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); 39470f6d82eSOmar Sandoval else if (cache_gen) 39573bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 39673bc1876SJosef Bacik 39796da0919SQu Wenruo /* 39896da0919SQu Wenruo * Even the options are empty, we still need to do extra check 39996da0919SQu Wenruo * against new flags 40096da0919SQu Wenruo */ 40195e05289SChris Mason if (!options) 40296da0919SQu Wenruo goto check; 40395e05289SChris Mason 404be20aa9dSChris Mason /* 405be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 406be20aa9dSChris Mason * gets called twice 407be20aa9dSChris Mason */ 408be20aa9dSChris Mason options = kstrdup(options, GFP_NOFS); 409be20aa9dSChris Mason if (!options) 410be20aa9dSChris Mason return -ENOMEM; 411be20aa9dSChris Mason 412da495eccSJosef Bacik orig = options; 413be20aa9dSChris Mason 41495e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 41595e05289SChris Mason int token; 41695e05289SChris Mason if (!*p) 41795e05289SChris Mason continue; 41895e05289SChris Mason 41995e05289SChris Mason token = match_token(p, tokens, args); 42095e05289SChris Mason switch (token) { 421dfe25020SChris Mason case Opt_degraded: 422efe120a0SFrank Holton btrfs_info(root->fs_info, "allowing degraded mounts"); 423dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 424dfe25020SChris Mason break; 42595e05289SChris Mason case Opt_subvol: 42673f73415SJosef Bacik case Opt_subvolid: 427e15d0542SXin Zhong case Opt_subvolrootid: 42843e570b0SChristoph Hellwig case Opt_device: 429edf24abeSChristoph Hellwig /* 43043e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 431edf24abeSChristoph Hellwig * and can be happily ignored here. 432edf24abeSChristoph Hellwig */ 43395e05289SChris Mason break; 434b6cda9bcSChris Mason case Opt_nodatasum: 43507802534SQu Wenruo btrfs_set_and_info(root, NODATASUM, 43607802534SQu Wenruo "setting nodatasum"); 437be20aa9dSChris Mason break; 438d399167dSQu Wenruo case Opt_datasum: 43907802534SQu Wenruo if (btrfs_test_opt(root, NODATASUM)) { 440d399167dSQu Wenruo if (btrfs_test_opt(root, NODATACOW)) 441d399167dSQu Wenruo btrfs_info(root->fs_info, "setting datasum, datacow enabled"); 442d399167dSQu Wenruo else 443d399167dSQu Wenruo btrfs_info(root->fs_info, "setting datasum"); 44407802534SQu Wenruo } 445d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 446d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 447d399167dSQu Wenruo break; 448be20aa9dSChris Mason case Opt_nodatacow: 44907802534SQu Wenruo if (!btrfs_test_opt(root, NODATACOW)) { 450bedb2ccaSAndrei Popa if (!btrfs_test_opt(root, COMPRESS) || 451bedb2ccaSAndrei Popa !btrfs_test_opt(root, FORCE_COMPRESS)) { 452efe120a0SFrank Holton btrfs_info(root->fs_info, 453efe120a0SFrank Holton "setting nodatacow, compression disabled"); 454bedb2ccaSAndrei Popa } else { 455efe120a0SFrank Holton btrfs_info(root->fs_info, "setting nodatacow"); 456bedb2ccaSAndrei Popa } 45707802534SQu Wenruo } 458bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 459bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 460be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 461be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 462b6cda9bcSChris Mason break; 463a258af7aSQu Wenruo case Opt_datacow: 46407802534SQu Wenruo btrfs_clear_and_info(root, NODATACOW, 46507802534SQu Wenruo "setting datacow"); 466a258af7aSQu Wenruo break; 467a555f810SChris Mason case Opt_compress_force: 468261507a0SLi Zefan case Opt_compress_force_type: 469261507a0SLi Zefan compress_force = true; 4701c697d4aSEric Sandeen /* Fallthrough */ 471261507a0SLi Zefan case Opt_compress: 472261507a0SLi Zefan case Opt_compress_type: 473b7c47bbbSTsutomu Itoh saved_compress_type = btrfs_test_opt(root, COMPRESS) ? 474b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 475b7c47bbbSTsutomu Itoh saved_compress_force = 476b7c47bbbSTsutomu Itoh btrfs_test_opt(root, FORCE_COMPRESS); 477261507a0SLi Zefan if (token == Opt_compress || 478261507a0SLi Zefan token == Opt_compress_force || 479261507a0SLi Zefan strcmp(args[0].from, "zlib") == 0) { 480261507a0SLi Zefan compress_type = "zlib"; 481261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 482063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 483bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 484bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 485b7c47bbbSTsutomu Itoh no_compress = 0; 486a6fa6faeSLi Zefan } else if (strcmp(args[0].from, "lzo") == 0) { 487a6fa6faeSLi Zefan compress_type = "lzo"; 488a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 489063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 490bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 491bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 4922b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 493b7c47bbbSTsutomu Itoh no_compress = 0; 494063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 495063849eaSArnd Hannemann compress_type = "no"; 496063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 497063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 498063849eaSArnd Hannemann compress_force = false; 499b7c47bbbSTsutomu Itoh no_compress++; 500261507a0SLi Zefan } else { 501261507a0SLi Zefan ret = -EINVAL; 502261507a0SLi Zefan goto out; 503261507a0SLi Zefan } 504261507a0SLi Zefan 505261507a0SLi Zefan if (compress_force) { 506b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 507143f3636SDavid Sterba } else { 5084027e0f4SWang Shilong /* 5094027e0f4SWang Shilong * If we remount from compress-force=xxx to 5104027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 5114027e0f4SWang Shilong * flag, otherwise, there is no way for users 5124027e0f4SWang Shilong * to disable forcible compression separately. 5134027e0f4SWang Shilong */ 5144027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 515a7e252afSMiao Xie } 516b7c47bbbSTsutomu Itoh if ((btrfs_test_opt(root, COMPRESS) && 517b7c47bbbSTsutomu Itoh (info->compress_type != saved_compress_type || 518b7c47bbbSTsutomu Itoh compress_force != saved_compress_force)) || 519b7c47bbbSTsutomu Itoh (!btrfs_test_opt(root, COMPRESS) && 520b7c47bbbSTsutomu Itoh no_compress == 1)) { 521b7c47bbbSTsutomu Itoh btrfs_info(root->fs_info, 522b7c47bbbSTsutomu Itoh "%s %s compression", 523b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 524b7c47bbbSTsutomu Itoh compress_type); 525b7c47bbbSTsutomu Itoh } 526b7c47bbbSTsutomu Itoh compress_force = false; 527a555f810SChris Mason break; 528e18e4809SChris Mason case Opt_ssd: 52907802534SQu Wenruo btrfs_set_and_info(root, SSD, 53007802534SQu Wenruo "use ssd allocation scheme"); 531e18e4809SChris Mason break; 532451d7585SChris Mason case Opt_ssd_spread: 53307802534SQu Wenruo btrfs_set_and_info(root, SSD_SPREAD, 53407802534SQu Wenruo "use spread ssd allocation scheme"); 5352aa06a35SEric Sandeen btrfs_set_opt(info->mount_opt, SSD); 536451d7585SChris Mason break; 5373b30c22fSChris Mason case Opt_nossd: 5382aa06a35SEric Sandeen btrfs_set_and_info(root, NOSSD, 53907802534SQu Wenruo "not using ssd allocation scheme"); 5403b30c22fSChris Mason btrfs_clear_opt(info->mount_opt, SSD); 5413b30c22fSChris Mason break; 542842bef58SQu Wenruo case Opt_barrier: 54307802534SQu Wenruo btrfs_clear_and_info(root, NOBARRIER, 54407802534SQu Wenruo "turning on barriers"); 545842bef58SQu Wenruo break; 54621ad10cfSChris Mason case Opt_nobarrier: 54707802534SQu Wenruo btrfs_set_and_info(root, NOBARRIER, 54807802534SQu Wenruo "turning off barriers"); 54921ad10cfSChris Mason break; 5504543df7eSChris Mason case Opt_thread_pool: 5512c334e87SWang Shilong ret = match_int(&args[0], &intarg); 5522c334e87SWang Shilong if (ret) { 5532c334e87SWang Shilong goto out; 5542c334e87SWang Shilong } else if (intarg > 0) { 5554543df7eSChris Mason info->thread_pool_size = intarg; 5562c334e87SWang Shilong } else { 5572c334e87SWang Shilong ret = -EINVAL; 5582c334e87SWang Shilong goto out; 5592c334e87SWang Shilong } 5604543df7eSChris Mason break; 5616f568d35SChris Mason case Opt_max_inline: 562edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5636f568d35SChris Mason if (num) { 56491748467SAkinobu Mita info->max_inline = memparse(num, NULL); 5656f568d35SChris Mason kfree(num); 5666f568d35SChris Mason 56715ada040SChris Mason if (info->max_inline) { 568feb5f965SMitch Harder info->max_inline = min_t(u64, 56915ada040SChris Mason info->max_inline, 57015ada040SChris Mason root->sectorsize); 57115ada040SChris Mason } 572efe120a0SFrank Holton btrfs_info(root->fs_info, "max_inline at %llu", 573c1c9ff7cSGeert Uytterhoeven info->max_inline); 5742c334e87SWang Shilong } else { 5752c334e87SWang Shilong ret = -ENOMEM; 5762c334e87SWang Shilong goto out; 5776f568d35SChris Mason } 5786f568d35SChris Mason break; 5798f662a76SChris Mason case Opt_alloc_start: 580edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5818f662a76SChris Mason if (num) { 582c018daecSMiao Xie mutex_lock(&info->chunk_mutex); 58391748467SAkinobu Mita info->alloc_start = memparse(num, NULL); 584c018daecSMiao Xie mutex_unlock(&info->chunk_mutex); 5858f662a76SChris Mason kfree(num); 586efe120a0SFrank Holton btrfs_info(root->fs_info, "allocations start at %llu", 587c1c9ff7cSGeert Uytterhoeven info->alloc_start); 5882c334e87SWang Shilong } else { 5892c334e87SWang Shilong ret = -ENOMEM; 5902c334e87SWang Shilong goto out; 5918f662a76SChris Mason } 5928f662a76SChris Mason break; 593bd0330adSQu Wenruo case Opt_acl: 59445ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 595bd0330adSQu Wenruo root->fs_info->sb->s_flags |= MS_POSIXACL; 596bd0330adSQu Wenruo break; 59745ff35d6SGuangliang Zhao #else 59845ff35d6SGuangliang Zhao btrfs_err(root->fs_info, 59945ff35d6SGuangliang Zhao "support for ACL not compiled in!"); 60045ff35d6SGuangliang Zhao ret = -EINVAL; 60145ff35d6SGuangliang Zhao goto out; 60245ff35d6SGuangliang Zhao #endif 60333268eafSJosef Bacik case Opt_noacl: 60433268eafSJosef Bacik root->fs_info->sb->s_flags &= ~MS_POSIXACL; 60533268eafSJosef Bacik break; 6063a5e1404SSage Weil case Opt_notreelog: 60707802534SQu Wenruo btrfs_set_and_info(root, NOTREELOG, 60807802534SQu Wenruo "disabling tree log"); 6093a5e1404SSage Weil break; 610a88998f2SQu Wenruo case Opt_treelog: 61107802534SQu Wenruo btrfs_clear_and_info(root, NOTREELOG, 61207802534SQu Wenruo "enabling tree log"); 613a88998f2SQu Wenruo break; 614fed8f166SQu Wenruo case Opt_norecovery: 61596da0919SQu Wenruo case Opt_nologreplay: 61696da0919SQu Wenruo btrfs_set_and_info(root, NOLOGREPLAY, 61796da0919SQu Wenruo "disabling log replay at mount time"); 61896da0919SQu Wenruo break; 619dccae999SSage Weil case Opt_flushoncommit: 62007802534SQu Wenruo btrfs_set_and_info(root, FLUSHONCOMMIT, 62107802534SQu Wenruo "turning on flush-on-commit"); 622dccae999SSage Weil break; 6232c9ee856SQu Wenruo case Opt_noflushoncommit: 62407802534SQu Wenruo btrfs_clear_and_info(root, FLUSHONCOMMIT, 62507802534SQu Wenruo "turning off flush-on-commit"); 6262c9ee856SQu Wenruo break; 62797e728d4SJosef Bacik case Opt_ratio: 6282c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6292c334e87SWang Shilong if (ret) { 6302c334e87SWang Shilong goto out; 6312c334e87SWang Shilong } else if (intarg >= 0) { 63297e728d4SJosef Bacik info->metadata_ratio = intarg; 633efe120a0SFrank Holton btrfs_info(root->fs_info, "metadata ratio %d", 63497e728d4SJosef Bacik info->metadata_ratio); 6352c334e87SWang Shilong } else { 6362c334e87SWang Shilong ret = -EINVAL; 6372c334e87SWang Shilong goto out; 63897e728d4SJosef Bacik } 63997e728d4SJosef Bacik break; 640e244a0aeSChristoph Hellwig case Opt_discard: 64107802534SQu Wenruo btrfs_set_and_info(root, DISCARD, 64207802534SQu Wenruo "turning on discard"); 643e244a0aeSChristoph Hellwig break; 644e07a2adeSQu Wenruo case Opt_nodiscard: 64507802534SQu Wenruo btrfs_clear_and_info(root, DISCARD, 64607802534SQu Wenruo "turning off discard"); 647e07a2adeSQu Wenruo break; 6480af3d00bSJosef Bacik case Opt_space_cache: 64970f6d82eSOmar Sandoval case Opt_space_cache_version: 65070f6d82eSOmar Sandoval if (token == Opt_space_cache || 65170f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 65270f6d82eSOmar Sandoval btrfs_clear_opt(root->fs_info->mount_opt, 65370f6d82eSOmar Sandoval FREE_SPACE_TREE); 65407802534SQu Wenruo btrfs_set_and_info(root, SPACE_CACHE, 65507802534SQu Wenruo "enabling disk space caching"); 65670f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 65770f6d82eSOmar Sandoval btrfs_clear_opt(root->fs_info->mount_opt, 65870f6d82eSOmar Sandoval SPACE_CACHE); 65970f6d82eSOmar Sandoval btrfs_set_and_info(root, FREE_SPACE_TREE, 66070f6d82eSOmar Sandoval "enabling free space tree"); 66170f6d82eSOmar Sandoval } else { 66270f6d82eSOmar Sandoval ret = -EINVAL; 66370f6d82eSOmar Sandoval goto out; 66470f6d82eSOmar Sandoval } 6650de90876SJosef Bacik break; 666f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 667f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 668f420ee1eSStefan Behrens break; 66973bc1876SJosef Bacik case Opt_no_space_cache: 67070f6d82eSOmar Sandoval if (btrfs_test_opt(root, SPACE_CACHE)) { 67107802534SQu Wenruo btrfs_clear_and_info(root, SPACE_CACHE, 67207802534SQu Wenruo "disabling disk space caching"); 67370f6d82eSOmar Sandoval } 67470f6d82eSOmar Sandoval if (btrfs_test_opt(root, FREE_SPACE_TREE)) { 67570f6d82eSOmar Sandoval btrfs_clear_and_info(root, FREE_SPACE_TREE, 67670f6d82eSOmar Sandoval "disabling free space tree"); 67770f6d82eSOmar Sandoval } 67873bc1876SJosef Bacik break; 6794b9465cbSChris Mason case Opt_inode_cache: 6807e1876acSDavid Sterba btrfs_set_pending_and_info(info, INODE_MAP_CACHE, 68107802534SQu Wenruo "enabling inode map caching"); 6823818aea2SQu Wenruo break; 6833818aea2SQu Wenruo case Opt_noinode_cache: 6847e1876acSDavid Sterba btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, 68507802534SQu Wenruo "disabling inode map caching"); 6864b9465cbSChris Mason break; 68788c2ba3bSJosef Bacik case Opt_clear_cache: 68807802534SQu Wenruo btrfs_set_and_info(root, CLEAR_CACHE, 68907802534SQu Wenruo "force clearing of disk cache"); 6900af3d00bSJosef Bacik break; 6914260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 6924260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 6934260f7c7SSage Weil break; 69491435650SChris Mason case Opt_enospc_debug: 69591435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 69691435650SChris Mason break; 69753036293SQu Wenruo case Opt_noenospc_debug: 69853036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 69953036293SQu Wenruo break; 7004cb5300bSChris Mason case Opt_defrag: 70107802534SQu Wenruo btrfs_set_and_info(root, AUTO_DEFRAG, 70207802534SQu Wenruo "enabling auto defrag"); 7034cb5300bSChris Mason break; 704fc0ca9afSQu Wenruo case Opt_nodefrag: 70507802534SQu Wenruo btrfs_clear_and_info(root, AUTO_DEFRAG, 70607802534SQu Wenruo "disabling auto defrag"); 707fc0ca9afSQu Wenruo break; 708af31f5e5SChris Mason case Opt_recovery: 7098dcddfa0SQu Wenruo btrfs_warn(root->fs_info, 7108dcddfa0SQu Wenruo "'recovery' is deprecated, use 'usebackuproot' instead"); 7118dcddfa0SQu Wenruo case Opt_usebackuproot: 7128dcddfa0SQu Wenruo btrfs_info(root->fs_info, 7138dcddfa0SQu Wenruo "trying to use backup root at mount time"); 7148dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 715af31f5e5SChris Mason break; 7169555c6c1SIlya Dryomov case Opt_skip_balance: 7179555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 7189555c6c1SIlya Dryomov break; 71921adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 72021adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 721efe120a0SFrank Holton btrfs_info(root->fs_info, 722efe120a0SFrank Holton "enabling check integrity including extent data"); 72321adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 72421adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 72521adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 72621adbd5cSStefan Behrens break; 72721adbd5cSStefan Behrens case Opt_check_integrity: 728efe120a0SFrank Holton btrfs_info(root->fs_info, "enabling check integrity"); 72921adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 73021adbd5cSStefan Behrens break; 73121adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7322c334e87SWang Shilong ret = match_int(&args[0], &intarg); 7332c334e87SWang Shilong if (ret) { 7342c334e87SWang Shilong goto out; 7352c334e87SWang Shilong } else if (intarg >= 0) { 73621adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 737efe120a0SFrank Holton btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", 73821adbd5cSStefan Behrens info->check_integrity_print_mask); 7392c334e87SWang Shilong } else { 7402c334e87SWang Shilong ret = -EINVAL; 7412c334e87SWang Shilong goto out; 74221adbd5cSStefan Behrens } 74321adbd5cSStefan Behrens break; 74421adbd5cSStefan Behrens #else 74521adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 74621adbd5cSStefan Behrens case Opt_check_integrity: 74721adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 748efe120a0SFrank Holton btrfs_err(root->fs_info, 749efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 75021adbd5cSStefan Behrens ret = -EINVAL; 75121adbd5cSStefan Behrens goto out; 75221adbd5cSStefan Behrens #endif 7538c342930SJeff Mahoney case Opt_fatal_errors: 7548c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 7558c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 7568c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 7578c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 7588c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 7598c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 7608c342930SJeff Mahoney else { 7618c342930SJeff Mahoney ret = -EINVAL; 7628c342930SJeff Mahoney goto out; 7638c342930SJeff Mahoney } 7648c342930SJeff Mahoney break; 7658b87dc17SDavid Sterba case Opt_commit_interval: 7668b87dc17SDavid Sterba intarg = 0; 7678b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 7688b87dc17SDavid Sterba if (ret < 0) { 769efe120a0SFrank Holton btrfs_err(root->fs_info, "invalid commit interval"); 7708b87dc17SDavid Sterba ret = -EINVAL; 7718b87dc17SDavid Sterba goto out; 7728b87dc17SDavid Sterba } 7738b87dc17SDavid Sterba if (intarg > 0) { 7748b87dc17SDavid Sterba if (intarg > 300) { 775efe120a0SFrank Holton btrfs_warn(root->fs_info, "excessive commit interval %d", 7768b87dc17SDavid Sterba intarg); 7778b87dc17SDavid Sterba } 7788b87dc17SDavid Sterba info->commit_interval = intarg; 7798b87dc17SDavid Sterba } else { 780efe120a0SFrank Holton btrfs_info(root->fs_info, "using default commit interval %ds", 7818b87dc17SDavid Sterba BTRFS_DEFAULT_COMMIT_INTERVAL); 7828b87dc17SDavid Sterba info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 7838b87dc17SDavid Sterba } 7848b87dc17SDavid Sterba break; 785d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 786d0bd4560SJosef Bacik case Opt_fragment_all: 787d0bd4560SJosef Bacik btrfs_info(root->fs_info, "fragmenting all space"); 788d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 789d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 790d0bd4560SJosef Bacik break; 791d0bd4560SJosef Bacik case Opt_fragment_metadata: 792d0bd4560SJosef Bacik btrfs_info(root->fs_info, "fragmenting metadata"); 793d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 794d0bd4560SJosef Bacik FRAGMENT_METADATA); 795d0bd4560SJosef Bacik break; 796d0bd4560SJosef Bacik case Opt_fragment_data: 797d0bd4560SJosef Bacik btrfs_info(root->fs_info, "fragmenting data"); 798d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 799d0bd4560SJosef Bacik break; 800d0bd4560SJosef Bacik #endif 801a7a3f7caSSage Weil case Opt_err: 802efe120a0SFrank Holton btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); 803a7a3f7caSSage Weil ret = -EINVAL; 804a7a3f7caSSage Weil goto out; 80595e05289SChris Mason default: 806be20aa9dSChris Mason break; 80795e05289SChris Mason } 80895e05289SChris Mason } 80996da0919SQu Wenruo check: 81096da0919SQu Wenruo /* 81196da0919SQu Wenruo * Extra check for current option against current flag 81296da0919SQu Wenruo */ 81396da0919SQu Wenruo if (btrfs_test_opt(root, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { 81496da0919SQu Wenruo btrfs_err(root->fs_info, 81596da0919SQu Wenruo "nologreplay must be used with ro mount option"); 81696da0919SQu Wenruo ret = -EINVAL; 81796da0919SQu Wenruo } 818a7a3f7caSSage Weil out: 81970f6d82eSOmar Sandoval if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && 82070f6d82eSOmar Sandoval !btrfs_test_opt(root, FREE_SPACE_TREE) && 82170f6d82eSOmar Sandoval !btrfs_test_opt(root, CLEAR_CACHE)) { 82270f6d82eSOmar Sandoval btrfs_err(root->fs_info, "cannot disable free space tree"); 82370f6d82eSOmar Sandoval ret = -EINVAL; 82470f6d82eSOmar Sandoval 82570f6d82eSOmar Sandoval } 82673bc1876SJosef Bacik if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 827efe120a0SFrank Holton btrfs_info(root->fs_info, "disk space caching is enabled"); 82870f6d82eSOmar Sandoval if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE)) 82970f6d82eSOmar Sandoval btrfs_info(root->fs_info, "using free space tree"); 830da495eccSJosef Bacik kfree(orig); 831a7a3f7caSSage Weil return ret; 832edf24abeSChristoph Hellwig } 833edf24abeSChristoph Hellwig 834edf24abeSChristoph Hellwig /* 835edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 836edf24abeSChristoph Hellwig * 837edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 838edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 839edf24abeSChristoph Hellwig */ 84097288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 84173f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 8425e2a4b25SDavid Sterba struct btrfs_fs_devices **fs_devices) 843edf24abeSChristoph Hellwig { 844edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 84583c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 8461493381fSWang Shilong char *num = NULL; 847edf24abeSChristoph Hellwig int error = 0; 848edf24abeSChristoph Hellwig 849edf24abeSChristoph Hellwig if (!options) 850830c4adbSJosef Bacik return 0; 851edf24abeSChristoph Hellwig 852edf24abeSChristoph Hellwig /* 853edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 854edf24abeSChristoph Hellwig * gets called twice 855edf24abeSChristoph Hellwig */ 856edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 857edf24abeSChristoph Hellwig if (!opts) 858edf24abeSChristoph Hellwig return -ENOMEM; 8593f3d0bc0STero Roponen orig = opts; 860edf24abeSChristoph Hellwig 861edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 862edf24abeSChristoph Hellwig int token; 863edf24abeSChristoph Hellwig if (!*p) 864edf24abeSChristoph Hellwig continue; 865edf24abeSChristoph Hellwig 866edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 867edf24abeSChristoph Hellwig switch (token) { 868edf24abeSChristoph Hellwig case Opt_subvol: 869a90e8b6fSIlya Dryomov kfree(*subvol_name); 870edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 8712c334e87SWang Shilong if (!*subvol_name) { 8722c334e87SWang Shilong error = -ENOMEM; 8732c334e87SWang Shilong goto out; 8742c334e87SWang Shilong } 875edf24abeSChristoph Hellwig break; 87673f73415SJosef Bacik case Opt_subvolid: 8771493381fSWang Shilong num = match_strdup(&args[0]); 8781493381fSWang Shilong if (num) { 8791493381fSWang Shilong *subvol_objectid = memparse(num, NULL); 8801493381fSWang Shilong kfree(num); 8814849f01dSJosef Bacik /* we want the original fs_tree */ 8821493381fSWang Shilong if (!*subvol_objectid) 8834849f01dSJosef Bacik *subvol_objectid = 8844849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 8852c334e87SWang Shilong } else { 8862c334e87SWang Shilong error = -EINVAL; 8872c334e87SWang Shilong goto out; 8884849f01dSJosef Bacik } 88973f73415SJosef Bacik break; 890e15d0542SXin Zhong case Opt_subvolrootid: 8915e2a4b25SDavid Sterba printk(KERN_WARNING 892efe120a0SFrank Holton "BTRFS: 'subvolrootid' mount option is deprecated and has " 893efe120a0SFrank Holton "no effect\n"); 894e15d0542SXin Zhong break; 89543e570b0SChristoph Hellwig case Opt_device: 89683c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 89783c8c9bdSJeff Liu if (!device_name) { 89883c8c9bdSJeff Liu error = -ENOMEM; 89983c8c9bdSJeff Liu goto out; 90083c8c9bdSJeff Liu } 90183c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 90243e570b0SChristoph Hellwig flags, holder, fs_devices); 90383c8c9bdSJeff Liu kfree(device_name); 90443e570b0SChristoph Hellwig if (error) 905830c4adbSJosef Bacik goto out; 90643e570b0SChristoph Hellwig break; 907edf24abeSChristoph Hellwig default: 908edf24abeSChristoph Hellwig break; 909edf24abeSChristoph Hellwig } 910edf24abeSChristoph Hellwig } 911edf24abeSChristoph Hellwig 912edf24abeSChristoph Hellwig out: 913830c4adbSJosef Bacik kfree(orig); 914edf24abeSChristoph Hellwig return error; 91595e05289SChris Mason } 91695e05289SChris Mason 91705dbe683SOmar Sandoval static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 91873f73415SJosef Bacik u64 subvol_objectid) 91973f73415SJosef Bacik { 920815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 92105dbe683SOmar Sandoval struct btrfs_root *fs_root; 92205dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 92305dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 92405dbe683SOmar Sandoval struct btrfs_key key; 92505dbe683SOmar Sandoval struct btrfs_path *path = NULL; 92605dbe683SOmar Sandoval char *name = NULL, *ptr; 92705dbe683SOmar Sandoval u64 dirid; 92805dbe683SOmar Sandoval int len; 92905dbe683SOmar Sandoval int ret; 93005dbe683SOmar Sandoval 93105dbe683SOmar Sandoval path = btrfs_alloc_path(); 93205dbe683SOmar Sandoval if (!path) { 93305dbe683SOmar Sandoval ret = -ENOMEM; 93405dbe683SOmar Sandoval goto err; 93505dbe683SOmar Sandoval } 93605dbe683SOmar Sandoval path->leave_spinning = 1; 93705dbe683SOmar Sandoval 93805dbe683SOmar Sandoval name = kmalloc(PATH_MAX, GFP_NOFS); 93905dbe683SOmar Sandoval if (!name) { 94005dbe683SOmar Sandoval ret = -ENOMEM; 94105dbe683SOmar Sandoval goto err; 94205dbe683SOmar Sandoval } 94305dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 94405dbe683SOmar Sandoval ptr[0] = '\0'; 94505dbe683SOmar Sandoval 94605dbe683SOmar Sandoval /* 94705dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 94805dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 94905dbe683SOmar Sandoval */ 95005dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 95105dbe683SOmar Sandoval key.objectid = subvol_objectid; 95205dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 95305dbe683SOmar Sandoval key.offset = (u64)-1; 95405dbe683SOmar Sandoval 95505dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 95605dbe683SOmar Sandoval if (ret < 0) { 95705dbe683SOmar Sandoval goto err; 95805dbe683SOmar Sandoval } else if (ret > 0) { 95905dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 96005dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 96105dbe683SOmar Sandoval if (ret < 0) { 96205dbe683SOmar Sandoval goto err; 96305dbe683SOmar Sandoval } else if (ret > 0) { 96405dbe683SOmar Sandoval ret = -ENOENT; 96505dbe683SOmar Sandoval goto err; 96605dbe683SOmar Sandoval } 96705dbe683SOmar Sandoval } 96805dbe683SOmar Sandoval 96905dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 97005dbe683SOmar Sandoval subvol_objectid = key.offset; 97105dbe683SOmar Sandoval 97205dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 97305dbe683SOmar Sandoval struct btrfs_root_ref); 97405dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 97505dbe683SOmar Sandoval ptr -= len + 1; 97605dbe683SOmar Sandoval if (ptr < name) { 97705dbe683SOmar Sandoval ret = -ENAMETOOLONG; 97805dbe683SOmar Sandoval goto err; 97905dbe683SOmar Sandoval } 98005dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 98105dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 98205dbe683SOmar Sandoval ptr[0] = '/'; 98305dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 98405dbe683SOmar Sandoval btrfs_release_path(path); 98505dbe683SOmar Sandoval 98605dbe683SOmar Sandoval key.objectid = subvol_objectid; 98705dbe683SOmar Sandoval key.type = BTRFS_ROOT_ITEM_KEY; 98805dbe683SOmar Sandoval key.offset = (u64)-1; 98905dbe683SOmar Sandoval fs_root = btrfs_read_fs_root_no_name(fs_info, &key); 99005dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 99105dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 99205dbe683SOmar Sandoval goto err; 99305dbe683SOmar Sandoval } 99405dbe683SOmar Sandoval 99505dbe683SOmar Sandoval /* 99605dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 99705dbe683SOmar Sandoval * root directory. 99805dbe683SOmar Sandoval */ 99905dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 100005dbe683SOmar Sandoval key.objectid = dirid; 100105dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 100205dbe683SOmar Sandoval key.offset = (u64)-1; 100305dbe683SOmar Sandoval 100405dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 100505dbe683SOmar Sandoval if (ret < 0) { 100605dbe683SOmar Sandoval goto err; 100705dbe683SOmar Sandoval } else if (ret > 0) { 100805dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 100905dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 101005dbe683SOmar Sandoval if (ret < 0) { 101105dbe683SOmar Sandoval goto err; 101205dbe683SOmar Sandoval } else if (ret > 0) { 101305dbe683SOmar Sandoval ret = -ENOENT; 101405dbe683SOmar Sandoval goto err; 101505dbe683SOmar Sandoval } 101605dbe683SOmar Sandoval } 101705dbe683SOmar Sandoval 101805dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 101905dbe683SOmar Sandoval dirid = key.offset; 102005dbe683SOmar Sandoval 102105dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 102205dbe683SOmar Sandoval path->slots[0], 102305dbe683SOmar Sandoval struct btrfs_inode_ref); 102405dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 102505dbe683SOmar Sandoval inode_ref); 102605dbe683SOmar Sandoval ptr -= len + 1; 102705dbe683SOmar Sandoval if (ptr < name) { 102805dbe683SOmar Sandoval ret = -ENAMETOOLONG; 102905dbe683SOmar Sandoval goto err; 103005dbe683SOmar Sandoval } 103105dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 103205dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 103305dbe683SOmar Sandoval ptr[0] = '/'; 103405dbe683SOmar Sandoval btrfs_release_path(path); 103505dbe683SOmar Sandoval } 103605dbe683SOmar Sandoval } 103705dbe683SOmar Sandoval 103805dbe683SOmar Sandoval btrfs_free_path(path); 103905dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 104005dbe683SOmar Sandoval name[0] = '/'; 104105dbe683SOmar Sandoval name[1] = '\0'; 104205dbe683SOmar Sandoval } else { 104305dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 104405dbe683SOmar Sandoval } 104505dbe683SOmar Sandoval return name; 104605dbe683SOmar Sandoval 104705dbe683SOmar Sandoval err: 104805dbe683SOmar Sandoval btrfs_free_path(path); 104905dbe683SOmar Sandoval kfree(name); 105005dbe683SOmar Sandoval return ERR_PTR(ret); 105105dbe683SOmar Sandoval } 105205dbe683SOmar Sandoval 105305dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 105405dbe683SOmar Sandoval { 105505dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 105673f73415SJosef Bacik struct btrfs_dir_item *di; 105773f73415SJosef Bacik struct btrfs_path *path; 105873f73415SJosef Bacik struct btrfs_key location; 105973f73415SJosef Bacik u64 dir_id; 106073f73415SJosef Bacik 106173f73415SJosef Bacik path = btrfs_alloc_path(); 106273f73415SJosef Bacik if (!path) 106305dbe683SOmar Sandoval return -ENOMEM; 106473f73415SJosef Bacik path->leave_spinning = 1; 106573f73415SJosef Bacik 106673f73415SJosef Bacik /* 106773f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 106873f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 106973f73415SJosef Bacik * to mount. 107073f73415SJosef Bacik */ 1071815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 107273f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1073b0839166SJulia Lawall if (IS_ERR(di)) { 1074b0839166SJulia Lawall btrfs_free_path(path); 107505dbe683SOmar Sandoval return PTR_ERR(di); 1076b0839166SJulia Lawall } 107773f73415SJosef Bacik if (!di) { 107873f73415SJosef Bacik /* 107973f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 108073f73415SJosef Bacik * it's always been there, but don't freak out, just try and 108105dbe683SOmar Sandoval * mount the top-level subvolume. 108273f73415SJosef Bacik */ 108373f73415SJosef Bacik btrfs_free_path(path); 108405dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 108505dbe683SOmar Sandoval return 0; 108673f73415SJosef Bacik } 108773f73415SJosef Bacik 108873f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 108973f73415SJosef Bacik btrfs_free_path(path); 109005dbe683SOmar Sandoval *objectid = location.objectid; 109105dbe683SOmar Sandoval return 0; 109273f73415SJosef Bacik } 109373f73415SJosef Bacik 10948a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 10958a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 10968a4b83ccSChris Mason void *data, int silent) 10972e635a27SChris Mason { 10982e635a27SChris Mason struct inode *inode; 1099815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 11005d4f98a2SYan Zheng struct btrfs_key key; 110139279cc3SChris Mason int err; 11022e635a27SChris Mason 11032e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 11042e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1105e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1106af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1107be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 11085103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 11092e635a27SChris Mason sb->s_time_gran = 1; 11100eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 111133268eafSJosef Bacik sb->s_flags |= MS_POSIXACL; 111249cf6f45SChris Ball #endif 11130c4d2d95SJosef Bacik sb->s_flags |= MS_I_VERSION; 1114da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 1115ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1116ad2b2c80SAl Viro if (err) { 1117efe120a0SFrank Holton printk(KERN_ERR "BTRFS: open_ctree failed\n"); 1118ad2b2c80SAl Viro return err; 1119e20d96d6SChris Mason } 1120b888db2bSChris Mason 11215d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 11225d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 11235d4f98a2SYan Zheng key.offset = 0; 112498c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 11255d4f98a2SYan Zheng if (IS_ERR(inode)) { 11265d4f98a2SYan Zheng err = PTR_ERR(inode); 112739279cc3SChris Mason goto fail_close; 112839279cc3SChris Mason } 11292e635a27SChris Mason 113048fde701SAl Viro sb->s_root = d_make_root(inode); 113148fde701SAl Viro if (!sb->s_root) { 113239279cc3SChris Mason err = -ENOMEM; 113339279cc3SChris Mason goto fail_close; 11342e635a27SChris Mason } 113558176a96SJosef Bacik 11366885f308SChris Mason save_mount_options(sb, data); 113790a887c9SDan Magenheimer cleancache_init_fs(sb); 113859553edfSAl Viro sb->s_flags |= MS_ACTIVE; 11392e635a27SChris Mason return 0; 11402e635a27SChris Mason 114139279cc3SChris Mason fail_close: 1142815745cfSAl Viro close_ctree(fs_info->tree_root); 1143d5719762SChris Mason return err; 1144d5719762SChris Mason } 1145d5719762SChris Mason 11466bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1147d5719762SChris Mason { 1148d5719762SChris Mason struct btrfs_trans_handle *trans; 1149815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1150815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1151df2ce34cSChris Mason 11521abe9b8aSliubo trace_btrfs_sync_fs(wait); 11531abe9b8aSliubo 1154d561c025SChris Mason if (!wait) { 1155815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1156df2ce34cSChris Mason return 0; 1157d561c025SChris Mason } 1158771ed689SChris Mason 1159578def7cSFilipe Manana btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); 1160771ed689SChris Mason 1161d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 116260376ce4SJosef Bacik if (IS_ERR(trans)) { 1163354aa0fbSMiao Xie /* no transaction, don't bother */ 11646b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 11656b5fe46dSDavid Sterba /* 11666b5fe46dSDavid Sterba * Exit unless we have some pending changes 11676b5fe46dSDavid Sterba * that need to go through commit 11686b5fe46dSDavid Sterba */ 11696b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1170bd7de2c9SJosef Bacik return 0; 1171a53f4f8eSQu Wenruo /* 1172a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1173a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1174a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1175a53f4f8eSQu Wenruo * next commit after thawing. 1176a53f4f8eSQu Wenruo */ 1177a53f4f8eSQu Wenruo if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) 1178a53f4f8eSQu Wenruo __sb_end_write(sb, SB_FREEZE_WRITE); 1179a53f4f8eSQu Wenruo else 1180a53f4f8eSQu Wenruo return 0; 11816b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 118260376ce4SJosef Bacik } 118398bd5c54SDavid Sterba if (IS_ERR(trans)) 118498bd5c54SDavid Sterba return PTR_ERR(trans); 11856b5fe46dSDavid Sterba } 1186bd7de2c9SJosef Bacik return btrfs_commit_transaction(trans, root); 1187d5719762SChris Mason } 1188d5719762SChris Mason 118934c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1190a9572a15SEric Paris { 1191815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 1192815745cfSAl Viro struct btrfs_root *root = info->tree_root; 1193200da64eSTsutomu Itoh char *compress_type; 1194a9572a15SEric Paris 1195a9572a15SEric Paris if (btrfs_test_opt(root, DEGRADED)) 1196a9572a15SEric Paris seq_puts(seq, ",degraded"); 1197a9572a15SEric Paris if (btrfs_test_opt(root, NODATASUM)) 1198a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 1199a9572a15SEric Paris if (btrfs_test_opt(root, NODATACOW)) 1200a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 1201a9572a15SEric Paris if (btrfs_test_opt(root, NOBARRIER)) 1202a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 120395ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1204c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1205a9572a15SEric Paris if (info->alloc_start != 0) 1206c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",alloc_start=%llu", info->alloc_start); 1207a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1208a9572a15SEric Paris num_online_cpus() + 2, 8)) 1209a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 1210200da64eSTsutomu Itoh if (btrfs_test_opt(root, COMPRESS)) { 1211200da64eSTsutomu Itoh if (info->compress_type == BTRFS_COMPRESS_ZLIB) 1212200da64eSTsutomu Itoh compress_type = "zlib"; 1213200da64eSTsutomu Itoh else 1214200da64eSTsutomu Itoh compress_type = "lzo"; 1215200da64eSTsutomu Itoh if (btrfs_test_opt(root, FORCE_COMPRESS)) 1216200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1217200da64eSTsutomu Itoh else 1218200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1219200da64eSTsutomu Itoh } 1220c289811cSChris Mason if (btrfs_test_opt(root, NOSSD)) 1221c289811cSChris Mason seq_puts(seq, ",nossd"); 1222451d7585SChris Mason if (btrfs_test_opt(root, SSD_SPREAD)) 1223451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 1224451d7585SChris Mason else if (btrfs_test_opt(root, SSD)) 1225a9572a15SEric Paris seq_puts(seq, ",ssd"); 12263a5e1404SSage Weil if (btrfs_test_opt(root, NOTREELOG)) 12276b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 122896da0919SQu Wenruo if (btrfs_test_opt(root, NOLOGREPLAY)) 122996da0919SQu Wenruo seq_puts(seq, ",nologreplay"); 1230dccae999SSage Weil if (btrfs_test_opt(root, FLUSHONCOMMIT)) 12316b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 123220a5239aSMatthew Wilcox if (btrfs_test_opt(root, DISCARD)) 123320a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 1234a9572a15SEric Paris if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 1235a9572a15SEric Paris seq_puts(seq, ",noacl"); 1236200da64eSTsutomu Itoh if (btrfs_test_opt(root, SPACE_CACHE)) 1237200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 123870f6d82eSOmar Sandoval else if (btrfs_test_opt(root, FREE_SPACE_TREE)) 123970f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 124073bc1876SJosef Bacik else 12418965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 1242f420ee1eSStefan Behrens if (btrfs_test_opt(root, RESCAN_UUID_TREE)) 1243f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 1244200da64eSTsutomu Itoh if (btrfs_test_opt(root, CLEAR_CACHE)) 1245200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 1246200da64eSTsutomu Itoh if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 1247200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 12480942caa3SDavid Sterba if (btrfs_test_opt(root, ENOSPC_DEBUG)) 12490942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 12500942caa3SDavid Sterba if (btrfs_test_opt(root, AUTO_DEFRAG)) 12510942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 12520942caa3SDavid Sterba if (btrfs_test_opt(root, INODE_MAP_CACHE)) 12530942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 12549555c6c1SIlya Dryomov if (btrfs_test_opt(root, SKIP_BALANCE)) 12559555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 12568507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 12578507d216SWang Shilong if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 12588507d216SWang Shilong seq_puts(seq, ",check_int_data"); 12598507d216SWang Shilong else if (btrfs_test_opt(root, CHECK_INTEGRITY)) 12608507d216SWang Shilong seq_puts(seq, ",check_int"); 12618507d216SWang Shilong if (info->check_integrity_print_mask) 12628507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 12638507d216SWang Shilong info->check_integrity_print_mask); 12648507d216SWang Shilong #endif 12658507d216SWang Shilong if (info->metadata_ratio) 12668507d216SWang Shilong seq_printf(seq, ",metadata_ratio=%d", 12678507d216SWang Shilong info->metadata_ratio); 12688c342930SJeff Mahoney if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 12698c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 12708b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 12718b87dc17SDavid Sterba seq_printf(seq, ",commit=%d", info->commit_interval); 1272d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 1273d0bd4560SJosef Bacik if (btrfs_test_opt(root, FRAGMENT_DATA)) 1274d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 1275d0bd4560SJosef Bacik if (btrfs_test_opt(root, FRAGMENT_METADATA)) 1276d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1277d0bd4560SJosef Bacik #endif 1278c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1279c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 1280c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 1281c8d3fe02SOmar Sandoval seq_dentry(seq, dentry, " \t\n\\"); 1282a9572a15SEric Paris return 0; 1283a9572a15SEric Paris } 1284a9572a15SEric Paris 1285a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 12862e635a27SChris Mason { 1287815745cfSAl Viro struct btrfs_fs_info *p = data; 1288815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 12894b82d6e4SYan 1290815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 12914b82d6e4SYan } 12924b82d6e4SYan 1293450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1294450ba0eaSJosef Bacik { 12956de1d09dSAl Viro int err = set_anon_super(s, data); 12966de1d09dSAl Viro if (!err) 1297450ba0eaSJosef Bacik s->s_fs_info = data; 12986de1d09dSAl Viro return err; 1299450ba0eaSJosef Bacik } 1300450ba0eaSJosef Bacik 1301830c4adbSJosef Bacik /* 1302f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1303f9d9ef62SDavid Sterba */ 1304f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1305f9d9ef62SDavid Sterba { 1306f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1307f9d9ef62SDavid Sterba return 1; 1308f9d9ef62SDavid Sterba return 0; 1309f9d9ef62SDavid Sterba } 1310f9d9ef62SDavid Sterba 1311f9d9ef62SDavid Sterba /* 1312e6e4dbe8SOmar Sandoval * This will add subvolid=0 to the argument string while removing any subvol= 1313e6e4dbe8SOmar Sandoval * and subvolid= arguments to make sure we get the top-level root for path 1314e6e4dbe8SOmar Sandoval * walking to the subvol we want. 1315830c4adbSJosef Bacik */ 1316830c4adbSJosef Bacik static char *setup_root_args(char *args) 1317830c4adbSJosef Bacik { 1318e6e4dbe8SOmar Sandoval char *buf, *dst, *sep; 1319830c4adbSJosef Bacik 1320e6e4dbe8SOmar Sandoval if (!args) 1321e6e4dbe8SOmar Sandoval return kstrdup("subvolid=0", GFP_NOFS); 1322830c4adbSJosef Bacik 1323e6e4dbe8SOmar Sandoval /* The worst case is that we add ",subvolid=0" to the end. */ 1324e6e4dbe8SOmar Sandoval buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); 1325f60d16a8SJim Meyering if (!buf) 1326f60d16a8SJim Meyering return NULL; 1327830c4adbSJosef Bacik 1328e6e4dbe8SOmar Sandoval while (1) { 1329e6e4dbe8SOmar Sandoval sep = strchrnul(args, ','); 1330e6e4dbe8SOmar Sandoval if (!strstarts(args, "subvol=") && 1331e6e4dbe8SOmar Sandoval !strstarts(args, "subvolid=")) { 1332e6e4dbe8SOmar Sandoval memcpy(dst, args, sep - args); 1333e6e4dbe8SOmar Sandoval dst += sep - args; 1334e6e4dbe8SOmar Sandoval *dst++ = ','; 1335830c4adbSJosef Bacik } 1336e6e4dbe8SOmar Sandoval if (*sep) 1337e6e4dbe8SOmar Sandoval args = sep + 1; 1338e6e4dbe8SOmar Sandoval else 1339e6e4dbe8SOmar Sandoval break; 1340e6e4dbe8SOmar Sandoval } 1341f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 1342830c4adbSJosef Bacik 1343f60d16a8SJim Meyering return buf; 1344830c4adbSJosef Bacik } 1345830c4adbSJosef Bacik 1346bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1347bb289b7bSOmar Sandoval int flags, const char *device_name, 1348bb289b7bSOmar Sandoval char *data) 1349830c4adbSJosef Bacik { 1350830c4adbSJosef Bacik struct dentry *root; 1351fa330659SOmar Sandoval struct vfsmount *mnt = NULL; 1352830c4adbSJosef Bacik char *newargs; 1353fa330659SOmar Sandoval int ret; 1354830c4adbSJosef Bacik 1355830c4adbSJosef Bacik newargs = setup_root_args(data); 1356fa330659SOmar Sandoval if (!newargs) { 1357fa330659SOmar Sandoval root = ERR_PTR(-ENOMEM); 1358fa330659SOmar Sandoval goto out; 1359fa330659SOmar Sandoval } 13600723a047SHarald Hoyer 1361fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); 1362fa330659SOmar Sandoval if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { 13630723a047SHarald Hoyer if (flags & MS_RDONLY) { 1364fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, 1365fa330659SOmar Sandoval device_name, newargs); 13660723a047SHarald Hoyer } else { 1367fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, 1368fa330659SOmar Sandoval device_name, newargs); 13690040e606SChristoph Jaeger if (IS_ERR(mnt)) { 1370fa330659SOmar Sandoval root = ERR_CAST(mnt); 1371fa330659SOmar Sandoval mnt = NULL; 1372fa330659SOmar Sandoval goto out; 13730040e606SChristoph Jaeger } 13740723a047SHarald Hoyer 1375773cd04eSOmar Sandoval down_write(&mnt->mnt_sb->s_umount); 1376fa330659SOmar Sandoval ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); 1377773cd04eSOmar Sandoval up_write(&mnt->mnt_sb->s_umount); 1378fa330659SOmar Sandoval if (ret < 0) { 1379fa330659SOmar Sandoval root = ERR_PTR(ret); 1380fa330659SOmar Sandoval goto out; 13810723a047SHarald Hoyer } 13820723a047SHarald Hoyer } 13830723a047SHarald Hoyer } 1384fa330659SOmar Sandoval if (IS_ERR(mnt)) { 1385fa330659SOmar Sandoval root = ERR_CAST(mnt); 1386fa330659SOmar Sandoval mnt = NULL; 1387fa330659SOmar Sandoval goto out; 1388fa330659SOmar Sandoval } 1389830c4adbSJosef Bacik 139005dbe683SOmar Sandoval if (!subvol_name) { 139105dbe683SOmar Sandoval if (!subvol_objectid) { 139205dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 139305dbe683SOmar Sandoval &subvol_objectid); 139405dbe683SOmar Sandoval if (ret) { 139505dbe683SOmar Sandoval root = ERR_PTR(ret); 139605dbe683SOmar Sandoval goto out; 139705dbe683SOmar Sandoval } 139805dbe683SOmar Sandoval } 139905dbe683SOmar Sandoval subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), 140005dbe683SOmar Sandoval subvol_objectid); 140105dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 140205dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 140305dbe683SOmar Sandoval subvol_name = NULL; 140405dbe683SOmar Sandoval goto out; 140505dbe683SOmar Sandoval } 140605dbe683SOmar Sandoval 140705dbe683SOmar Sandoval } 140805dbe683SOmar Sandoval 1409ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1410fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1411fa330659SOmar Sandoval mnt = NULL; 1412830c4adbSJosef Bacik 1413bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1414ea441d11SAl Viro struct super_block *s = root->d_sb; 1415bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1416bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1417bb289b7bSOmar Sandoval 1418bb289b7bSOmar Sandoval ret = 0; 1419bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1420bb289b7bSOmar Sandoval pr_err("BTRFS: '%s' is not a valid subvolume\n", 1421bb289b7bSOmar Sandoval subvol_name); 1422bb289b7bSOmar Sandoval ret = -EINVAL; 1423bb289b7bSOmar Sandoval } 1424bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 142505dbe683SOmar Sandoval /* 142605dbe683SOmar Sandoval * This will also catch a race condition where a 142705dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 142805dbe683SOmar Sandoval * another subvolume is renamed over the old location. 142905dbe683SOmar Sandoval */ 1430bb289b7bSOmar Sandoval pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", 1431bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1432bb289b7bSOmar Sandoval ret = -EINVAL; 1433bb289b7bSOmar Sandoval } 1434bb289b7bSOmar Sandoval if (ret) { 1435ea441d11SAl Viro dput(root); 1436bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1437ea441d11SAl Viro deactivate_locked_super(s); 1438bb289b7bSOmar Sandoval } 1439f9d9ef62SDavid Sterba } 1440f9d9ef62SDavid Sterba 1441fa330659SOmar Sandoval out: 1442fa330659SOmar Sandoval mntput(mnt); 1443fa330659SOmar Sandoval kfree(newargs); 1444fa330659SOmar Sandoval kfree(subvol_name); 1445830c4adbSJosef Bacik return root; 1446830c4adbSJosef Bacik } 1447450ba0eaSJosef Bacik 1448f667aef6SQu Wenruo static int parse_security_options(char *orig_opts, 1449f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1450f667aef6SQu Wenruo { 1451f667aef6SQu Wenruo char *secdata = NULL; 1452f667aef6SQu Wenruo int ret = 0; 1453f667aef6SQu Wenruo 1454f667aef6SQu Wenruo secdata = alloc_secdata(); 1455f667aef6SQu Wenruo if (!secdata) 1456f667aef6SQu Wenruo return -ENOMEM; 1457f667aef6SQu Wenruo ret = security_sb_copy_data(orig_opts, secdata); 1458f667aef6SQu Wenruo if (ret) { 1459f667aef6SQu Wenruo free_secdata(secdata); 1460f667aef6SQu Wenruo return ret; 1461f667aef6SQu Wenruo } 1462f667aef6SQu Wenruo ret = security_sb_parse_opts_str(secdata, sec_opts); 1463f667aef6SQu Wenruo free_secdata(secdata); 1464f667aef6SQu Wenruo return ret; 1465f667aef6SQu Wenruo } 1466f667aef6SQu Wenruo 1467f667aef6SQu Wenruo static int setup_security_options(struct btrfs_fs_info *fs_info, 1468f667aef6SQu Wenruo struct super_block *sb, 1469f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1470f667aef6SQu Wenruo { 1471f667aef6SQu Wenruo int ret = 0; 1472f667aef6SQu Wenruo 1473f667aef6SQu Wenruo /* 1474f667aef6SQu Wenruo * Call security_sb_set_mnt_opts() to check whether new sec_opts 1475f667aef6SQu Wenruo * is valid. 1476f667aef6SQu Wenruo */ 1477f667aef6SQu Wenruo ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); 1478f667aef6SQu Wenruo if (ret) 1479f667aef6SQu Wenruo return ret; 1480f667aef6SQu Wenruo 1481a43bb39bSQu Wenruo #ifdef CONFIG_SECURITY 1482f667aef6SQu Wenruo if (!fs_info->security_opts.num_mnt_opts) { 1483f667aef6SQu Wenruo /* first time security setup, copy sec_opts to fs_info */ 1484f667aef6SQu Wenruo memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); 1485f667aef6SQu Wenruo } else { 1486f667aef6SQu Wenruo /* 1487180e4d47SLuis de Bethencourt * Since SELinux (the only one supporting security_mnt_opts) 1488180e4d47SLuis de Bethencourt * does NOT support changing context during remount/mount of 1489180e4d47SLuis de Bethencourt * the same sb, this must be the same or part of the same 1490180e4d47SLuis de Bethencourt * security options, just free it. 1491f667aef6SQu Wenruo */ 1492f667aef6SQu Wenruo security_free_mnt_opts(sec_opts); 1493f667aef6SQu Wenruo } 1494a43bb39bSQu Wenruo #endif 1495f667aef6SQu Wenruo return ret; 1496f667aef6SQu Wenruo } 1497f667aef6SQu Wenruo 1498edf24abeSChristoph Hellwig /* 1499edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1500edf24abeSChristoph Hellwig * 1501edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1502edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1503edf24abeSChristoph Hellwig */ 1504061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1505306e16ceSDavid Sterba const char *device_name, void *data) 15064b82d6e4SYan { 15074b82d6e4SYan struct block_device *bdev = NULL; 15084b82d6e4SYan struct super_block *s; 15098a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1510450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 1511f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 151297288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 151373f73415SJosef Bacik char *subvol_name = NULL; 151473f73415SJosef Bacik u64 subvol_objectid = 0; 15154b82d6e4SYan int error = 0; 15164b82d6e4SYan 151797288f2cSChristoph Hellwig if (!(flags & MS_RDONLY)) 151897288f2cSChristoph Hellwig mode |= FMODE_WRITE; 151997288f2cSChristoph Hellwig 152097288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 152173f73415SJosef Bacik &subvol_name, &subvol_objectid, 15225e2a4b25SDavid Sterba &fs_devices); 1523f23c8af8SIlya Dryomov if (error) { 1524f23c8af8SIlya Dryomov kfree(subvol_name); 1525061dbc6bSAl Viro return ERR_PTR(error); 1526f23c8af8SIlya Dryomov } 1527edf24abeSChristoph Hellwig 152805dbe683SOmar Sandoval if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 1529fa330659SOmar Sandoval /* mount_subvol() will free subvol_name. */ 1530bb289b7bSOmar Sandoval return mount_subvol(subvol_name, subvol_objectid, flags, 1531bb289b7bSOmar Sandoval device_name, data); 1532830c4adbSJosef Bacik } 1533830c4adbSJosef Bacik 1534f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1535f667aef6SQu Wenruo if (data) { 1536f667aef6SQu Wenruo error = parse_security_options(data, &new_sec_opts); 15378a4b83ccSChris Mason if (error) 1538830c4adbSJosef Bacik return ERR_PTR(error); 1539f667aef6SQu Wenruo } 1540f667aef6SQu Wenruo 1541f667aef6SQu Wenruo error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1542f667aef6SQu Wenruo if (error) 1543f667aef6SQu Wenruo goto error_sec_opts; 15444b82d6e4SYan 1545450ba0eaSJosef Bacik /* 1546450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1547450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1548450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1549450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1550450ba0eaSJosef Bacik */ 1551450ba0eaSJosef Bacik fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 1552f667aef6SQu Wenruo if (!fs_info) { 1553f667aef6SQu Wenruo error = -ENOMEM; 1554f667aef6SQu Wenruo goto error_sec_opts; 1555f667aef6SQu Wenruo } 155604d21a24SIlya Dryomov 1557450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1558450ba0eaSJosef Bacik 15596c41761fSDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 15606c41761fSDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 1561f667aef6SQu Wenruo security_init_mnt_opts(&fs_info->security_opts); 15626c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 15636c41761fSDavid Sterba error = -ENOMEM; 156404d21a24SIlya Dryomov goto error_fs_info; 156504d21a24SIlya Dryomov } 156604d21a24SIlya Dryomov 156704d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 156804d21a24SIlya Dryomov if (error) 156904d21a24SIlya Dryomov goto error_fs_info; 157004d21a24SIlya Dryomov 157104d21a24SIlya Dryomov if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 157204d21a24SIlya Dryomov error = -EACCES; 15736c41761fSDavid Sterba goto error_close_devices; 15746c41761fSDavid Sterba } 15756c41761fSDavid Sterba 1576dfe25020SChris Mason bdev = fs_devices->latest_bdev; 15779249e17fSDavid Howells s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 15789249e17fSDavid Howells fs_info); 1579830c4adbSJosef Bacik if (IS_ERR(s)) { 1580830c4adbSJosef Bacik error = PTR_ERR(s); 1581830c4adbSJosef Bacik goto error_close_devices; 1582830c4adbSJosef Bacik } 15834b82d6e4SYan 15844b82d6e4SYan if (s->s_root) { 15852b82032cSYan Zheng btrfs_close_devices(fs_devices); 15866c41761fSDavid Sterba free_fs_info(fs_info); 158759553edfSAl Viro if ((flags ^ s->s_flags) & MS_RDONLY) 158859553edfSAl Viro error = -EBUSY; 15894b82d6e4SYan } else { 1590a1c6f057SDmitry Monakhov snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1591815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 15928a4b83ccSChris Mason error = btrfs_fill_super(s, fs_devices, data, 15938a4b83ccSChris Mason flags & MS_SILENT ? 1 : 0); 15944b82d6e4SYan } 159505dbe683SOmar Sandoval if (error) { 1596e15d0542SXin Zhong deactivate_locked_super(s); 1597f667aef6SQu Wenruo goto error_sec_opts; 1598f667aef6SQu Wenruo } 1599f667aef6SQu Wenruo 1600f667aef6SQu Wenruo fs_info = btrfs_sb(s); 1601f667aef6SQu Wenruo error = setup_security_options(fs_info, s, &new_sec_opts); 1602f667aef6SQu Wenruo if (error) { 1603f667aef6SQu Wenruo deactivate_locked_super(s); 1604f667aef6SQu Wenruo goto error_sec_opts; 1605f667aef6SQu Wenruo } 16064b82d6e4SYan 160705dbe683SOmar Sandoval return dget(s->s_root); 16084b82d6e4SYan 1609c146afadSYan Zheng error_close_devices: 16108a4b83ccSChris Mason btrfs_close_devices(fs_devices); 161104d21a24SIlya Dryomov error_fs_info: 16126c41761fSDavid Sterba free_fs_info(fs_info); 1613f667aef6SQu Wenruo error_sec_opts: 1614f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1615061dbc6bSAl Viro return ERR_PTR(error); 16164b82d6e4SYan } 16172e635a27SChris Mason 16180d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 16190d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 16200d2450abSSergei Trofimovich { 16210d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 16220d2450abSSergei Trofimovich return; 16230d2450abSSergei Trofimovich 16240d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 16250d2450abSSergei Trofimovich 1626efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 16270d2450abSSergei Trofimovich old_pool_size, new_pool_size); 16280d2450abSSergei Trofimovich 16295cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1630afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1631a8c93d4eSQu Wenruo btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1632e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1633fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1634fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1635fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1636fccb5d86SQu Wenruo new_pool_size); 1637fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1638fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 16395b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1640736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 16410339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1642ff023aacSStefan Behrens new_pool_size); 16430d2450abSSergei Trofimovich } 16440d2450abSSergei Trofimovich 1645f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1646dc81cdc5SMiao Xie { 1647dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1648f42a34b2SMiao Xie } 1649dc81cdc5SMiao Xie 1650f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1651f42a34b2SMiao Xie unsigned long old_opts, int flags) 1652f42a34b2SMiao Xie { 1653dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1654dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1655dc81cdc5SMiao Xie (flags & MS_RDONLY))) { 1656dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1657dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1658dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 1659dc81cdc5SMiao Xie if (flags & MS_RDONLY) 1660dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1661dc81cdc5SMiao Xie } 1662dc81cdc5SMiao Xie } 1663dc81cdc5SMiao Xie 1664dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1665dc81cdc5SMiao Xie unsigned long old_opts) 1666dc81cdc5SMiao Xie { 1667dc81cdc5SMiao Xie /* 1668180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1669180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1670dc81cdc5SMiao Xie */ 1671dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1672dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1673dc81cdc5SMiao Xie (fs_info->sb->s_flags & MS_RDONLY))) { 1674dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1675dc81cdc5SMiao Xie } 1676dc81cdc5SMiao Xie 1677dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1678dc81cdc5SMiao Xie } 1679dc81cdc5SMiao Xie 1680c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1681c146afadSYan Zheng { 1682815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1683815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 168449b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 168549b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 168649b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 168749b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 168849b25e05SJeff Mahoney u64 old_alloc_start = fs_info->alloc_start; 168949b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 169049b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1691c146afadSYan Zheng int ret; 1692c146afadSYan Zheng 169302b9984dSTheodore Ts'o sync_filesystem(sb); 1694f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1695dc81cdc5SMiao Xie 1696f667aef6SQu Wenruo if (data) { 1697f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 1698f667aef6SQu Wenruo 1699f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1700f667aef6SQu Wenruo ret = parse_security_options(data, &new_sec_opts); 1701f667aef6SQu Wenruo if (ret) 1702f667aef6SQu Wenruo goto restore; 1703f667aef6SQu Wenruo ret = setup_security_options(fs_info, sb, 1704f667aef6SQu Wenruo &new_sec_opts); 1705f667aef6SQu Wenruo if (ret) { 1706f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1707f667aef6SQu Wenruo goto restore; 1708f667aef6SQu Wenruo } 1709f667aef6SQu Wenruo } 1710f667aef6SQu Wenruo 171196da0919SQu Wenruo ret = btrfs_parse_options(root, data, *flags); 171249b25e05SJeff Mahoney if (ret) { 171349b25e05SJeff Mahoney ret = -EINVAL; 171449b25e05SJeff Mahoney goto restore; 171549b25e05SJeff Mahoney } 1716b288052eSChris Mason 1717f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 17180d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 17190d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 17200d2450abSSergei Trofimovich 1721c146afadSYan Zheng if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1722dc81cdc5SMiao Xie goto out; 1723c146afadSYan Zheng 1724c146afadSYan Zheng if (*flags & MS_RDONLY) { 17258dabb742SStefan Behrens /* 17268dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 17278dabb742SStefan Behrens * the filesystem is busy. 17288dabb742SStefan Behrens */ 172921c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 1730361c093dSStefan Behrens 1731361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1732361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1733361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1734361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1735361c093dSStefan Behrens 1736c146afadSYan Zheng sb->s_flags |= MS_RDONLY; 1737c146afadSYan Zheng 1738e44163e1SJeff Mahoney /* 1739e44163e1SJeff Mahoney * Setting MS_RDONLY will put the cleaner thread to 1740e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1741e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1742e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1743e44163e1SJeff Mahoney * unless we clean them up here. 1744e44163e1SJeff Mahoney */ 1745e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1746e44163e1SJeff Mahoney 17478dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 17488dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1749061594efSMiao Xie btrfs_pause_balance(fs_info); 17508dabb742SStefan Behrens 1751c146afadSYan Zheng ret = btrfs_commit_super(root); 175249b25e05SJeff Mahoney if (ret) 175349b25e05SJeff Mahoney goto restore; 1754c146afadSYan Zheng } else { 17556ef3de9cSDavid Sterba if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { 17566ef3de9cSDavid Sterba btrfs_err(fs_info, 1757efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 17586ef3de9cSDavid Sterba ret = -EINVAL; 17596ef3de9cSDavid Sterba goto restore; 17606ef3de9cSDavid Sterba } 17618a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 176249b25e05SJeff Mahoney ret = -EACCES; 176349b25e05SJeff Mahoney goto restore; 17648a3db184SSergei Trofimovich } 17652b82032cSYan Zheng 1766292fd7fcSStefan Behrens if (fs_info->fs_devices->missing_devices > 1767292fd7fcSStefan Behrens fs_info->num_tolerated_disk_barrier_failures && 1768292fd7fcSStefan Behrens !(*flags & MS_RDONLY)) { 1769efe120a0SFrank Holton btrfs_warn(fs_info, 1770efe120a0SFrank Holton "too many missing devices, writeable remount is not allowed"); 1771292fd7fcSStefan Behrens ret = -EACCES; 1772292fd7fcSStefan Behrens goto restore; 1773292fd7fcSStefan Behrens } 1774292fd7fcSStefan Behrens 17758a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 177649b25e05SJeff Mahoney ret = -EINVAL; 177749b25e05SJeff Mahoney goto restore; 17788a3db184SSergei Trofimovich } 1779c146afadSYan Zheng 1780815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 178149b25e05SJeff Mahoney if (ret) 178249b25e05SJeff Mahoney goto restore; 1783c146afadSYan Zheng 1784d68fc57bSYan, Zheng /* recover relocation */ 17855f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 1786d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 17875f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 178849b25e05SJeff Mahoney if (ret) 178949b25e05SJeff Mahoney goto restore; 1790c146afadSYan Zheng 17912b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 17922b6ba629SIlya Dryomov if (ret) 17932b6ba629SIlya Dryomov goto restore; 17942b6ba629SIlya Dryomov 17958dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 17968dabb742SStefan Behrens if (ret) { 1797efe120a0SFrank Holton btrfs_warn(fs_info, "failed to resume dev_replace"); 17988dabb742SStefan Behrens goto restore; 17998dabb742SStefan Behrens } 180094aebfb2SJosef Bacik 180194aebfb2SJosef Bacik if (!fs_info->uuid_root) { 1802efe120a0SFrank Holton btrfs_info(fs_info, "creating UUID tree"); 180394aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 180494aebfb2SJosef Bacik if (ret) { 1805efe120a0SFrank Holton btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); 180694aebfb2SJosef Bacik goto restore; 180794aebfb2SJosef Bacik } 180894aebfb2SJosef Bacik } 1809c146afadSYan Zheng sb->s_flags &= ~MS_RDONLY; 1810*90c711abSZygo Blaxell 1811*90c711abSZygo Blaxell fs_info->open = 1; 1812c146afadSYan Zheng } 1813dc81cdc5SMiao Xie out: 18142c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 1815dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1816c146afadSYan Zheng return 0; 181749b25e05SJeff Mahoney 181849b25e05SJeff Mahoney restore: 181949b25e05SJeff Mahoney /* We've hit an error - don't reset MS_RDONLY */ 182049b25e05SJeff Mahoney if (sb->s_flags & MS_RDONLY) 182149b25e05SJeff Mahoney old_flags |= MS_RDONLY; 182249b25e05SJeff Mahoney sb->s_flags = old_flags; 182349b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 182449b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 182549b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 1826c018daecSMiao Xie mutex_lock(&fs_info->chunk_mutex); 182749b25e05SJeff Mahoney fs_info->alloc_start = old_alloc_start; 1828c018daecSMiao Xie mutex_unlock(&fs_info->chunk_mutex); 18290d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 18300d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 183149b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1832dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 183349b25e05SJeff Mahoney return ret; 1834c146afadSYan Zheng } 1835c146afadSYan Zheng 1836bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1837bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1838bcd53741SArne Jansen const void *dev_info2) 1839bcd53741SArne Jansen { 1840bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1841bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1842bcd53741SArne Jansen return -1; 1843bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1844bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1845bcd53741SArne Jansen return 1; 1846bcd53741SArne Jansen else 1847bcd53741SArne Jansen return 0; 1848bcd53741SArne Jansen } 1849bcd53741SArne Jansen 1850bcd53741SArne Jansen /* 1851bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1852bcd53741SArne Jansen * is stored.(Descending Sort) 1853bcd53741SArne Jansen */ 1854bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1855bcd53741SArne Jansen struct btrfs_device_info *devices, 1856bcd53741SArne Jansen size_t nr_devices) 1857bcd53741SArne Jansen { 1858bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1859bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1860bcd53741SArne Jansen } 1861bcd53741SArne Jansen 18626d07bcecSMiao Xie /* 18636d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 18646d07bcecSMiao Xie * file data. 18656d07bcecSMiao Xie */ 18666d07bcecSMiao Xie static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 18676d07bcecSMiao Xie { 18686d07bcecSMiao Xie struct btrfs_fs_info *fs_info = root->fs_info; 18696d07bcecSMiao Xie struct btrfs_device_info *devices_info; 18706d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 18716d07bcecSMiao Xie struct btrfs_device *device; 18726d07bcecSMiao Xie u64 skip_space; 18736d07bcecSMiao Xie u64 type; 18746d07bcecSMiao Xie u64 avail_space; 18756d07bcecSMiao Xie u64 used_space; 18766d07bcecSMiao Xie u64 min_stripe_size; 187739fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 18786d07bcecSMiao Xie int i = 0, nr_devices; 18796d07bcecSMiao Xie int ret; 18806d07bcecSMiao Xie 18817e33fd99SJosef Bacik /* 188201327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 18837e33fd99SJosef Bacik * enough for our purposes. 18847e33fd99SJosef Bacik */ 1885b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 18867e33fd99SJosef Bacik if (!nr_devices) { 18877e33fd99SJosef Bacik smp_mb(); 18887e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 18897e33fd99SJosef Bacik ASSERT(nr_devices); 18907e33fd99SJosef Bacik if (!nr_devices) { 18917e33fd99SJosef Bacik *free_bytes = 0; 18927e33fd99SJosef Bacik return 0; 18937e33fd99SJosef Bacik } 18947e33fd99SJosef Bacik } 18956d07bcecSMiao Xie 1896d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 18976d07bcecSMiao Xie GFP_NOFS); 18986d07bcecSMiao Xie if (!devices_info) 18996d07bcecSMiao Xie return -ENOMEM; 19006d07bcecSMiao Xie 190101327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 19026d07bcecSMiao Xie type = btrfs_get_alloc_profile(root, 1); 190339fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 19046d07bcecSMiao Xie min_stripes = 2; 190539fb26c3SMiao Xie num_stripes = nr_devices; 190639fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 19076d07bcecSMiao Xie min_stripes = 2; 190839fb26c3SMiao Xie num_stripes = 2; 190939fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 19106d07bcecSMiao Xie min_stripes = 4; 191139fb26c3SMiao Xie num_stripes = 4; 191239fb26c3SMiao Xie } 19136d07bcecSMiao Xie 19146d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 19156d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 19166d07bcecSMiao Xie else 19176d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 19186d07bcecSMiao Xie 19197e33fd99SJosef Bacik if (fs_info->alloc_start) 19207e33fd99SJosef Bacik mutex_lock(&fs_devices->device_list_mutex); 19217e33fd99SJosef Bacik rcu_read_lock(); 19227e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 192363a212abSStefan Behrens if (!device->in_fs_metadata || !device->bdev || 192463a212abSStefan Behrens device->is_tgtdev_for_dev_replace) 19256d07bcecSMiao Xie continue; 19266d07bcecSMiao Xie 19277e33fd99SJosef Bacik if (i >= nr_devices) 19287e33fd99SJosef Bacik break; 19297e33fd99SJosef Bacik 19306d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 19316d07bcecSMiao Xie 19326d07bcecSMiao Xie /* align with stripe_len */ 1933f8c269d7SDavid Sterba avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); 19346d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 19356d07bcecSMiao Xie 19366d07bcecSMiao Xie /* 193701327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 19386d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 19396d07bcecSMiao Xie * allocation. 19406d07bcecSMiao Xie */ 1941ee22184bSByongho Lee skip_space = SZ_1M; 19426d07bcecSMiao Xie 19436d07bcecSMiao Xie /* user can set the offset in fs_info->alloc_start. */ 19447e33fd99SJosef Bacik if (fs_info->alloc_start && 19457e33fd99SJosef Bacik fs_info->alloc_start + BTRFS_STRIPE_LEN <= 19467e33fd99SJosef Bacik device->total_bytes) { 19477e33fd99SJosef Bacik rcu_read_unlock(); 19486d07bcecSMiao Xie skip_space = max(fs_info->alloc_start, skip_space); 19496d07bcecSMiao Xie 19506d07bcecSMiao Xie /* 19517e33fd99SJosef Bacik * btrfs can not use the free space in 19527e33fd99SJosef Bacik * [0, skip_space - 1], we must subtract it from the 19537e33fd99SJosef Bacik * total. In order to implement it, we account the used 19547e33fd99SJosef Bacik * space in this range first. 19556d07bcecSMiao Xie */ 19567e33fd99SJosef Bacik ret = btrfs_account_dev_extents_size(device, 0, 19577e33fd99SJosef Bacik skip_space - 1, 19586d07bcecSMiao Xie &used_space); 19596d07bcecSMiao Xie if (ret) { 19606d07bcecSMiao Xie kfree(devices_info); 19617e33fd99SJosef Bacik mutex_unlock(&fs_devices->device_list_mutex); 19626d07bcecSMiao Xie return ret; 19636d07bcecSMiao Xie } 19646d07bcecSMiao Xie 19657e33fd99SJosef Bacik rcu_read_lock(); 19667e33fd99SJosef Bacik 19676d07bcecSMiao Xie /* calc the free space in [0, skip_space - 1] */ 19686d07bcecSMiao Xie skip_space -= used_space; 19697e33fd99SJosef Bacik } 19706d07bcecSMiao Xie 19716d07bcecSMiao Xie /* 19726d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 19736d07bcecSMiao Xie * it from the total. 19746d07bcecSMiao Xie */ 19756d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 19766d07bcecSMiao Xie avail_space -= skip_space; 19776d07bcecSMiao Xie else 19786d07bcecSMiao Xie avail_space = 0; 19796d07bcecSMiao Xie 19806d07bcecSMiao Xie if (avail_space < min_stripe_size) 19816d07bcecSMiao Xie continue; 19826d07bcecSMiao Xie 19836d07bcecSMiao Xie devices_info[i].dev = device; 19846d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 19856d07bcecSMiao Xie 19866d07bcecSMiao Xie i++; 19876d07bcecSMiao Xie } 19887e33fd99SJosef Bacik rcu_read_unlock(); 19897e33fd99SJosef Bacik if (fs_info->alloc_start) 19907e33fd99SJosef Bacik mutex_unlock(&fs_devices->device_list_mutex); 19916d07bcecSMiao Xie 19926d07bcecSMiao Xie nr_devices = i; 19936d07bcecSMiao Xie 19946d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 19956d07bcecSMiao Xie 19966d07bcecSMiao Xie i = nr_devices - 1; 19976d07bcecSMiao Xie avail_space = 0; 19986d07bcecSMiao Xie while (nr_devices >= min_stripes) { 199939fb26c3SMiao Xie if (num_stripes > nr_devices) 200039fb26c3SMiao Xie num_stripes = nr_devices; 200139fb26c3SMiao Xie 20026d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 20036d07bcecSMiao Xie int j; 20046d07bcecSMiao Xie u64 alloc_size; 20056d07bcecSMiao Xie 200639fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 20076d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 200839fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 20096d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 20106d07bcecSMiao Xie } 20116d07bcecSMiao Xie i--; 20126d07bcecSMiao Xie nr_devices--; 20136d07bcecSMiao Xie } 20146d07bcecSMiao Xie 20156d07bcecSMiao Xie kfree(devices_info); 20166d07bcecSMiao Xie *free_bytes = avail_space; 20176d07bcecSMiao Xie return 0; 20186d07bcecSMiao Xie } 20196d07bcecSMiao Xie 2020ba7b6e62SDavid Sterba /* 2021ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2022ba7b6e62SDavid Sterba * 2023ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2024ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2025ba7b6e62SDavid Sterba * 2026ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 2027ba7b6e62SDavid Sterba * algorithm that respects the device sizes, order of allocations and the 2028ba7b6e62SDavid Sterba * 'alloc_start' value, this is a close approximation of the actual use but 2029ba7b6e62SDavid Sterba * there are other factors that may change the result (like a new metadata 2030ba7b6e62SDavid Sterba * chunk). 2031ba7b6e62SDavid Sterba * 2032ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2033ca8a51b3SDavid Sterba * 2034ba7b6e62SDavid Sterba * FIXME: not accurate for mixed block groups, total and free/used are ok, 2035ba7b6e62SDavid Sterba * available appears slightly larger. 2036ba7b6e62SDavid Sterba */ 20378fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 20388fd17795SChris Mason { 2039815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2040815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2041815745cfSAl Viro struct list_head *head = &fs_info->space_info; 2042bd4d1088SJosef Bacik struct btrfs_space_info *found; 2043bd4d1088SJosef Bacik u64 total_used = 0; 20446d07bcecSMiao Xie u64 total_free_data = 0; 2045ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2046db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 2047815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 2048ba7b6e62SDavid Sterba unsigned factor = 1; 2049ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 20506d07bcecSMiao Xie int ret; 2051ca8a51b3SDavid Sterba u64 thresh = 0; 2052ae02d1bdSLuis de Bethencourt int mixed = 0; 20538fd17795SChris Mason 205415484377SMiao Xie /* 2055180e4d47SLuis de Bethencourt * holding chunk_mutex to avoid allocating new chunks, holding 205615484377SMiao Xie * device_list_mutex to avoid the device being removed 205715484377SMiao Xie */ 2058bd4d1088SJosef Bacik rcu_read_lock(); 205989a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 20606d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2061ba7b6e62SDavid Sterba int i; 2062ba7b6e62SDavid Sterba 20636d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 20646d07bcecSMiao Xie total_free_data -= 20656d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2066ba7b6e62SDavid Sterba 2067ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 2068ba7b6e62SDavid Sterba if (!list_empty(&found->block_groups[i])) { 2069ba7b6e62SDavid Sterba switch (i) { 2070ba7b6e62SDavid Sterba case BTRFS_RAID_DUP: 2071ba7b6e62SDavid Sterba case BTRFS_RAID_RAID1: 2072ba7b6e62SDavid Sterba case BTRFS_RAID_RAID10: 2073ba7b6e62SDavid Sterba factor = 2; 2074ba7b6e62SDavid Sterba } 2075ba7b6e62SDavid Sterba } 2076ba7b6e62SDavid Sterba } 20776d07bcecSMiao Xie } 2078ae02d1bdSLuis de Bethencourt 2079ae02d1bdSLuis de Bethencourt /* 2080ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2081ae02d1bdSLuis de Bethencourt */ 2082ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2083ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2084ae02d1bdSLuis de Bethencourt mixed = 1; 2085ae02d1bdSLuis de Bethencourt else 2086ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2087ae02d1bdSLuis de Bethencourt found->disk_used; 2088ae02d1bdSLuis de Bethencourt } 20896d07bcecSMiao Xie 2090b742bb82SYan, Zheng total_used += found->disk_used; 209189a55897SJosef Bacik } 2092ba7b6e62SDavid Sterba 2093bd4d1088SJosef Bacik rcu_read_unlock(); 2094bd4d1088SJosef Bacik 2095ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2096ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2097ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2098ba7b6e62SDavid Sterba 2099ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2100ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 210141b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 210241b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2103ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 210441b34accSLuis de Bethencourt else 210541b34accSLuis de Bethencourt buf->f_bfree = 0; 2106ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2107ba7b6e62SDavid Sterba 21080d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 2109815745cfSAl Viro ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 21107e33fd99SJosef Bacik if (ret) 21116d07bcecSMiao Xie return ret; 2112ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 21136d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2114d397712bSChris Mason 2115ca8a51b3SDavid Sterba /* 2116ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2117ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2118ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2119ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2120ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2121ca8a51b3SDavid Sterba * 2122ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2123ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2124ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2125ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2126ca8a51b3SDavid Sterba * way around. 2127ca8a51b3SDavid Sterba */ 2128ca8a51b3SDavid Sterba thresh = 4 * 1024 * 1024; 2129ca8a51b3SDavid Sterba 2130ae02d1bdSLuis de Bethencourt if (!mixed && total_free_meta - thresh < block_rsv->size) 2131ca8a51b3SDavid Sterba buf->f_bavail = 0; 2132ca8a51b3SDavid Sterba 2133ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2134ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2135ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2136ba7b6e62SDavid Sterba 21379d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 21389d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 21399d03632eSDavid Woodhouse on a big-endian or little-endian host */ 21409d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 21419d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 214232d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 21432b0143b5SDavid Howells buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; 21442b0143b5SDavid Howells buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; 214532d48fa1SDavid Woodhouse 21468fd17795SChris Mason return 0; 21478fd17795SChris Mason } 2148b5133862SChris Mason 2149aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2150aea52e19SAl Viro { 2151815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2152aea52e19SAl Viro kill_anon_super(sb); 2153aea52e19SAl Viro free_fs_info(fs_info); 2154aea52e19SAl Viro } 2155aea52e19SAl Viro 21562e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 21572e635a27SChris Mason .owner = THIS_MODULE, 21582e635a27SChris Mason .name = "btrfs", 2159061dbc6bSAl Viro .mount = btrfs_mount, 2160aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2161f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 21622e635a27SChris Mason }; 21637f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2164a9218f6bSChris Mason 2165d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2166d8620958STom Van Braeckel { 2167d8620958STom Van Braeckel /* 2168d8620958STom Van Braeckel * The control file's private_data is used to hold the 2169d8620958STom Van Braeckel * transaction when it is started and is used to keep 2170d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2171d8620958STom Van Braeckel */ 2172d8620958STom Van Braeckel file->private_data = NULL; 2173d8620958STom Van Braeckel return 0; 2174d8620958STom Van Braeckel } 2175d8620958STom Van Braeckel 2176d352ac68SChris Mason /* 2177d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 2178d352ac68SChris Mason */ 21798a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 21808a4b83ccSChris Mason unsigned long arg) 21818a4b83ccSChris Mason { 21828a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 21838a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 2184c071fcfdSChris Mason int ret = -ENOTTY; 21858a4b83ccSChris Mason 2186e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2187e441d54dSChris Mason return -EPERM; 2188e441d54dSChris Mason 2189dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2190dae7b665SLi Zefan if (IS_ERR(vol)) 2191dae7b665SLi Zefan return PTR_ERR(vol); 2192c071fcfdSChris Mason 21938a4b83ccSChris Mason switch (cmd) { 21948a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 219597288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 21968a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 21978a4b83ccSChris Mason break; 219802db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 219902db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 220002db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 220102db0844SJosef Bacik if (ret) 220202db0844SJosef Bacik break; 220302db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 220402db0844SJosef Bacik break; 2205c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2206d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2207c5868f83SDavid Sterba break; 22088a4b83ccSChris Mason } 2209dae7b665SLi Zefan 22108a4b83ccSChris Mason kfree(vol); 2211f819d837SLinda Knippers return ret; 22128a4b83ccSChris Mason } 22138a4b83ccSChris Mason 22140176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2215ed0dab6bSYan { 2216354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 2217354aa0fbSMiao Xie struct btrfs_root *root = btrfs_sb(sb)->tree_root; 2218354aa0fbSMiao Xie 2219d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2220354aa0fbSMiao Xie if (IS_ERR(trans)) { 2221354aa0fbSMiao Xie /* no transaction, don't bother */ 2222354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 22230176260fSLinus Torvalds return 0; 2224354aa0fbSMiao Xie return PTR_ERR(trans); 2225354aa0fbSMiao Xie } 2226354aa0fbSMiao Xie return btrfs_commit_transaction(trans, root); 2227ed0dab6bSYan } 2228ed0dab6bSYan 22299c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 22309c5085c1SJosef Bacik { 22319c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 22329c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 22339c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 22349c5085c1SJosef Bacik struct list_head *head; 22359c5085c1SJosef Bacik struct rcu_string *name; 22369c5085c1SJosef Bacik 22379c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 22389c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 22399c5085c1SJosef Bacik while (cur_devices) { 22409c5085c1SJosef Bacik head = &cur_devices->devices; 22419c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 2242aa9ddcd4SJosef Bacik if (dev->missing) 2243aa9ddcd4SJosef Bacik continue; 22440aeb8a6eSAnand Jain if (!dev->name) 22450aeb8a6eSAnand Jain continue; 22469c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 22479c5085c1SJosef Bacik first_dev = dev; 22489c5085c1SJosef Bacik } 22499c5085c1SJosef Bacik cur_devices = cur_devices->seed; 22509c5085c1SJosef Bacik } 22519c5085c1SJosef Bacik 22529c5085c1SJosef Bacik if (first_dev) { 22539c5085c1SJosef Bacik rcu_read_lock(); 22549c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 22559c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 22569c5085c1SJosef Bacik rcu_read_unlock(); 22579c5085c1SJosef Bacik } else { 22589c5085c1SJosef Bacik WARN_ON(1); 22599c5085c1SJosef Bacik } 22609c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 22619c5085c1SJosef Bacik return 0; 22629c5085c1SJosef Bacik } 22639c5085c1SJosef Bacik 2264b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 226576dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2266bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2267e20d96d6SChris Mason .put_super = btrfs_put_super, 2268d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2269a9572a15SEric Paris .show_options = btrfs_show_options, 22709c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 22714730a4bcSChris Mason .write_inode = btrfs_write_inode, 22722c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 22732c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 22748fd17795SChris Mason .statfs = btrfs_statfs, 2275c146afadSYan Zheng .remount_fs = btrfs_remount, 22760176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 2277e20d96d6SChris Mason }; 2278a9218f6bSChris Mason 2279a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2280d8620958STom Van Braeckel .open = btrfs_control_open, 2281a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 2282a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 2283a9218f6bSChris Mason .owner = THIS_MODULE, 22846038f373SArnd Bergmann .llseek = noop_llseek, 2285a9218f6bSChris Mason }; 2286a9218f6bSChris Mason 2287a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2288578454ffSKay Sievers .minor = BTRFS_MINOR, 2289a9218f6bSChris Mason .name = "btrfs-control", 2290a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2291a9218f6bSChris Mason }; 2292a9218f6bSChris Mason 2293578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2294578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2295578454ffSKay Sievers 2296a9218f6bSChris Mason static int btrfs_interface_init(void) 2297a9218f6bSChris Mason { 2298a9218f6bSChris Mason return misc_register(&btrfs_misc); 2299a9218f6bSChris Mason } 2300a9218f6bSChris Mason 2301b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 2302a9218f6bSChris Mason { 2303f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2304a9218f6bSChris Mason } 2305a9218f6bSChris Mason 23068ae1af3cSAnand Jain static void btrfs_print_mod_info(void) 230785965600SDavid Sterba { 23085f9e1059SJeff Mahoney printk(KERN_INFO "Btrfs loaded, crc32c=%s" 230985965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 231085965600SDavid Sterba ", debug=on" 231185965600SDavid Sterba #endif 231279556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 231379556c3dSStefan Behrens ", assert=on" 231479556c3dSStefan Behrens #endif 231585965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 231685965600SDavid Sterba ", integrity-checker=on" 231785965600SDavid Sterba #endif 23185f9e1059SJeff Mahoney "\n", 23195f9e1059SJeff Mahoney btrfs_crc32c_impl()); 232085965600SDavid Sterba } 232185965600SDavid Sterba 2322dc11dd5dSJosef Bacik static int btrfs_run_sanity_tests(void) 2323dc11dd5dSJosef Bacik { 2324d94f43b4SFeifei Xu int ret, i; 2325b9ef22deSFeifei Xu u32 sectorsize, nodesize; 2326d94f43b4SFeifei Xu u32 test_sectorsize[] = { 2327d94f43b4SFeifei Xu PAGE_SIZE, 2328d94f43b4SFeifei Xu }; 2329294e30feSJosef Bacik ret = btrfs_init_test_fs(); 233006ea65a3SJosef Bacik if (ret) 233106ea65a3SJosef Bacik return ret; 2332d94f43b4SFeifei Xu for (i = 0; i < ARRAY_SIZE(test_sectorsize); i++) { 2333d94f43b4SFeifei Xu sectorsize = test_sectorsize[i]; 2334d94f43b4SFeifei Xu for (nodesize = sectorsize; 2335d94f43b4SFeifei Xu nodesize <= BTRFS_MAX_METADATA_BLOCKSIZE; 2336d94f43b4SFeifei Xu nodesize <<= 1) { 2337d94f43b4SFeifei Xu pr_info("BTRFS: selftest: sectorsize: %u nodesize: %u\n", 2338d94f43b4SFeifei Xu sectorsize, nodesize); 2339b9ef22deSFeifei Xu ret = btrfs_test_free_space_cache(sectorsize, nodesize); 2340294e30feSJosef Bacik if (ret) 2341294e30feSJosef Bacik goto out; 2342b9ef22deSFeifei Xu ret = btrfs_test_extent_buffer_operations(sectorsize, 2343b9ef22deSFeifei Xu nodesize); 2344294e30feSJosef Bacik if (ret) 2345294e30feSJosef Bacik goto out; 2346b9ef22deSFeifei Xu ret = btrfs_test_extent_io(sectorsize, nodesize); 2347aaedb55bSJosef Bacik if (ret) 2348aaedb55bSJosef Bacik goto out; 2349b9ef22deSFeifei Xu ret = btrfs_test_inodes(sectorsize, nodesize); 2350faa2dbf0SJosef Bacik if (ret) 2351faa2dbf0SJosef Bacik goto out; 2352b9ef22deSFeifei Xu ret = btrfs_test_qgroups(sectorsize, nodesize); 23537c55ee0cSOmar Sandoval if (ret) 23547c55ee0cSOmar Sandoval goto out; 2355b9ef22deSFeifei Xu ret = btrfs_test_free_space_tree(sectorsize, nodesize); 2356d94f43b4SFeifei Xu if (ret) 2357d94f43b4SFeifei Xu goto out; 2358d94f43b4SFeifei Xu } 2359d94f43b4SFeifei Xu } 2360294e30feSJosef Bacik out: 2361294e30feSJosef Bacik btrfs_destroy_test_fs(); 2362294e30feSJosef Bacik return ret; 2363dc11dd5dSJosef Bacik } 2364dc11dd5dSJosef Bacik 23652e635a27SChris Mason static int __init init_btrfs_fs(void) 23662e635a27SChris Mason { 23672c90e5d6SChris Mason int err; 236858176a96SJosef Bacik 236914a958e6SFilipe David Borba Manana err = btrfs_hash_init(); 237014a958e6SFilipe David Borba Manana if (err) 237114a958e6SFilipe David Borba Manana return err; 237214a958e6SFilipe David Borba Manana 237363541927SFilipe David Borba Manana btrfs_props_init(); 237463541927SFilipe David Borba Manana 237558176a96SJosef Bacik err = btrfs_init_sysfs(); 237658176a96SJosef Bacik if (err) 237714a958e6SFilipe David Borba Manana goto free_hash; 237858176a96SJosef Bacik 2379143bede5SJeff Mahoney btrfs_init_compress(); 2380d1310b2eSChris Mason 2381261507a0SLi Zefan err = btrfs_init_cachep(); 2382261507a0SLi Zefan if (err) 2383261507a0SLi Zefan goto free_compress; 2384261507a0SLi Zefan 2385d1310b2eSChris Mason err = extent_io_init(); 23862f4cbe64SWyatt Banks if (err) 23872f4cbe64SWyatt Banks goto free_cachep; 23882f4cbe64SWyatt Banks 2389d1310b2eSChris Mason err = extent_map_init(); 2390d1310b2eSChris Mason if (err) 2391d1310b2eSChris Mason goto free_extent_io; 2392d1310b2eSChris Mason 23936352b91dSMiao Xie err = ordered_data_init(); 23942f4cbe64SWyatt Banks if (err) 23952f4cbe64SWyatt Banks goto free_extent_map; 2396c8b97818SChris Mason 23976352b91dSMiao Xie err = btrfs_delayed_inode_init(); 23986352b91dSMiao Xie if (err) 23996352b91dSMiao Xie goto free_ordered_data; 24006352b91dSMiao Xie 24019247f317SMiao Xie err = btrfs_auto_defrag_init(); 240216cdcec7SMiao Xie if (err) 240316cdcec7SMiao Xie goto free_delayed_inode; 240416cdcec7SMiao Xie 240578a6184aSMiao Xie err = btrfs_delayed_ref_init(); 24069247f317SMiao Xie if (err) 24079247f317SMiao Xie goto free_auto_defrag; 24089247f317SMiao Xie 2409b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2410b9e9a6cbSWang Shilong if (err) 2411af13b492SDavid Sterba goto free_delayed_ref; 2412b9e9a6cbSWang Shilong 241397eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 241478a6184aSMiao Xie if (err) 2415af13b492SDavid Sterba goto free_prelim_ref; 241678a6184aSMiao Xie 241797eb6b69SDavid Sterba err = btrfs_interface_init(); 241897eb6b69SDavid Sterba if (err) 241997eb6b69SDavid Sterba goto free_end_io_wq; 242097eb6b69SDavid Sterba 2421e565d4b9SJan Schmidt btrfs_init_lockdep(); 2422e565d4b9SJan Schmidt 24238ae1af3cSAnand Jain btrfs_print_mod_info(); 2424dc11dd5dSJosef Bacik 2425dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2426dc11dd5dSJosef Bacik if (err) 2427dc11dd5dSJosef Bacik goto unregister_ioctl; 2428dc11dd5dSJosef Bacik 2429dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2430dc11dd5dSJosef Bacik if (err) 2431dc11dd5dSJosef Bacik goto unregister_ioctl; 243274255aa0SJosef Bacik 24332f4cbe64SWyatt Banks return 0; 24342f4cbe64SWyatt Banks 2435a9218f6bSChris Mason unregister_ioctl: 2436a9218f6bSChris Mason btrfs_interface_exit(); 243797eb6b69SDavid Sterba free_end_io_wq: 243897eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2439b9e9a6cbSWang Shilong free_prelim_ref: 2440b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 244178a6184aSMiao Xie free_delayed_ref: 244278a6184aSMiao Xie btrfs_delayed_ref_exit(); 24439247f317SMiao Xie free_auto_defrag: 24449247f317SMiao Xie btrfs_auto_defrag_exit(); 244516cdcec7SMiao Xie free_delayed_inode: 244616cdcec7SMiao Xie btrfs_delayed_inode_exit(); 24476352b91dSMiao Xie free_ordered_data: 24486352b91dSMiao Xie ordered_data_exit(); 24492f4cbe64SWyatt Banks free_extent_map: 24502f4cbe64SWyatt Banks extent_map_exit(); 2451d1310b2eSChris Mason free_extent_io: 2452d1310b2eSChris Mason extent_io_exit(); 24532f4cbe64SWyatt Banks free_cachep: 24542f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2455261507a0SLi Zefan free_compress: 2456261507a0SLi Zefan btrfs_exit_compress(); 24572f4cbe64SWyatt Banks btrfs_exit_sysfs(); 245814a958e6SFilipe David Borba Manana free_hash: 245914a958e6SFilipe David Borba Manana btrfs_hash_exit(); 24602c90e5d6SChris Mason return err; 24612e635a27SChris Mason } 24622e635a27SChris Mason 24632e635a27SChris Mason static void __exit exit_btrfs_fs(void) 24642e635a27SChris Mason { 246539279cc3SChris Mason btrfs_destroy_cachep(); 246678a6184aSMiao Xie btrfs_delayed_ref_exit(); 24679247f317SMiao Xie btrfs_auto_defrag_exit(); 246816cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2469b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 24706352b91dSMiao Xie ordered_data_exit(); 2471a52d9a80SChris Mason extent_map_exit(); 2472d1310b2eSChris Mason extent_io_exit(); 2473a9218f6bSChris Mason btrfs_interface_exit(); 24745ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 24752e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 247658176a96SJosef Bacik btrfs_exit_sysfs(); 24778a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2478261507a0SLi Zefan btrfs_exit_compress(); 247914a958e6SFilipe David Borba Manana btrfs_hash_exit(); 24802e635a27SChris Mason } 24812e635a27SChris Mason 248260efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 24832e635a27SChris Mason module_exit(exit_btrfs_fs) 24842e635a27SChris Mason 24852e635a27SChris Mason MODULE_LICENSE("GPL"); 2486