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; 68*72fa39f5SMisono, Tomohiro 69*72fa39f5SMisono, Tomohiro /* 70*72fa39f5SMisono, Tomohiro * Types for mounting the default subvolume and a subvolume explicitly 71*72fa39f5SMisono, Tomohiro * requested by subvol=/path. That way the callchain is straightforward and we 72*72fa39f5SMisono, Tomohiro * don't have to play tricks with the mount options and recursive calls to 73*72fa39f5SMisono, Tomohiro * btrfs_mount. 74*72fa39f5SMisono, Tomohiro */ 75830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 76*72fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type; 77e20d96d6SChris Mason 780723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 790723a047SHarald Hoyer 80e33e17eeSJeff Mahoney const char *btrfs_decode_error(int errno) 81acce952bSliubo { 8208748810SDavid Sterba char *errstr = "unknown"; 83acce952bSliubo 84acce952bSliubo switch (errno) { 85acce952bSliubo case -EIO: 86acce952bSliubo errstr = "IO failure"; 87acce952bSliubo break; 88acce952bSliubo case -ENOMEM: 89acce952bSliubo errstr = "Out of memory"; 90acce952bSliubo break; 91acce952bSliubo case -EROFS: 92acce952bSliubo errstr = "Readonly filesystem"; 93acce952bSliubo break; 948c342930SJeff Mahoney case -EEXIST: 958c342930SJeff Mahoney errstr = "Object already exists"; 968c342930SJeff Mahoney break; 9794ef7280SDavid Sterba case -ENOSPC: 9894ef7280SDavid Sterba errstr = "No space left"; 9994ef7280SDavid Sterba break; 10094ef7280SDavid Sterba case -ENOENT: 10194ef7280SDavid Sterba errstr = "No such entry"; 10294ef7280SDavid Sterba break; 103acce952bSliubo } 104acce952bSliubo 105acce952bSliubo return errstr; 106acce952bSliubo } 107acce952bSliubo 108acce952bSliubo /* btrfs handle error by forcing the filesystem readonly */ 109acce952bSliubo static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 110acce952bSliubo { 111acce952bSliubo struct super_block *sb = fs_info->sb; 112acce952bSliubo 113bc98a42cSDavid Howells if (sb_rdonly(sb)) 114acce952bSliubo return; 115acce952bSliubo 11687533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 1171751e8a6SLinus Torvalds sb->s_flags |= SB_RDONLY; 118c2cf52ebSSimon Kirby btrfs_info(fs_info, "forced readonly"); 1191acd6831SStefan Behrens /* 1201acd6831SStefan Behrens * Note that a running device replace operation is not 1211acd6831SStefan Behrens * canceled here although there is no way to update 1221acd6831SStefan Behrens * the progress. It would add the risk of a deadlock, 12301327610SNicholas D Steeves * therefore the canceling is omitted. The only penalty 1241acd6831SStefan Behrens * is that some I/O remains active until the procedure 1251acd6831SStefan Behrens * completes. The next time when the filesystem is 1261acd6831SStefan Behrens * mounted writeable again, the device replace 1271acd6831SStefan Behrens * operation continues. 1281acd6831SStefan Behrens */ 129acce952bSliubo } 130acce952bSliubo } 131acce952bSliubo 132acce952bSliubo /* 13334d97007SAnand Jain * __btrfs_handle_fs_error decodes expected errors from the caller and 134acce952bSliubo * invokes the approciate error response. 135acce952bSliubo */ 136c0d19e2bSDavid Sterba __cold 13734d97007SAnand Jain void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 1384da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 139acce952bSliubo { 140acce952bSliubo struct super_block *sb = fs_info->sb; 14157d816a1SAnand Jain #ifdef CONFIG_PRINTK 142acce952bSliubo const char *errstr; 14357d816a1SAnand Jain #endif 144acce952bSliubo 145acce952bSliubo /* 146acce952bSliubo * Special case: if the error is EROFS, and we're already 1471751e8a6SLinus Torvalds * under SB_RDONLY, then it is safe here. 148acce952bSliubo */ 149bc98a42cSDavid Howells if (errno == -EROFS && sb_rdonly(sb)) 150acce952bSliubo return; 151acce952bSliubo 15257d816a1SAnand Jain #ifdef CONFIG_PRINTK 15308748810SDavid Sterba errstr = btrfs_decode_error(errno); 1544da35113SJeff Mahoney if (fmt) { 15537252a66SEric Sandeen struct va_format vaf; 15637252a66SEric Sandeen va_list args; 15737252a66SEric Sandeen 15837252a66SEric Sandeen va_start(args, fmt); 15937252a66SEric Sandeen vaf.fmt = fmt; 16037252a66SEric Sandeen vaf.va = &args; 1614da35113SJeff Mahoney 16262e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 16308748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 16437252a66SEric Sandeen va_end(args); 1654da35113SJeff Mahoney } else { 16662e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 16708748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1684da35113SJeff Mahoney } 16957d816a1SAnand Jain #endif 170acce952bSliubo 1710713d90cSAnand Jain /* 1720713d90cSAnand Jain * Today we only save the error info to memory. Long term we'll 1730713d90cSAnand Jain * also send it down to the disk 1740713d90cSAnand Jain */ 1750713d90cSAnand Jain set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 1760713d90cSAnand Jain 1774da35113SJeff Mahoney /* Don't go through full error handling during mount */ 1781751e8a6SLinus Torvalds if (sb->s_flags & SB_BORN) 179acce952bSliubo btrfs_handle_error(fs_info); 180acce952bSliubo } 1814da35113SJeff Mahoney 18257d816a1SAnand Jain #ifdef CONFIG_PRINTK 183533574c6SJoe Perches static const char * const logtypes[] = { 1844da35113SJeff Mahoney "emergency", 1854da35113SJeff Mahoney "alert", 1864da35113SJeff Mahoney "critical", 1874da35113SJeff Mahoney "error", 1884da35113SJeff Mahoney "warning", 1894da35113SJeff Mahoney "notice", 1904da35113SJeff Mahoney "info", 1914da35113SJeff Mahoney "debug", 1924da35113SJeff Mahoney }; 1934da35113SJeff Mahoney 19435f4e5e6SNikolay Borisov 19535f4e5e6SNikolay Borisov /* 19635f4e5e6SNikolay Borisov * Use one ratelimit state per log level so that a flood of less important 19735f4e5e6SNikolay Borisov * messages doesn't cause more important ones to be dropped. 19835f4e5e6SNikolay Borisov */ 19935f4e5e6SNikolay Borisov static struct ratelimit_state printk_limits[] = { 20035f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), 20135f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), 20235f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), 20335f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), 20435f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), 20535f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), 20635f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), 20735f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), 20835f4e5e6SNikolay Borisov }; 20935f4e5e6SNikolay Borisov 210c2cf52ebSSimon Kirby void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 2114da35113SJeff Mahoney { 21240f7828bSPetr Mladek char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; 2134da35113SJeff Mahoney struct va_format vaf; 2144da35113SJeff Mahoney va_list args; 215533574c6SJoe Perches int kern_level; 21640f7828bSPetr Mladek const char *type = logtypes[4]; 21740f7828bSPetr Mladek struct ratelimit_state *ratelimit = &printk_limits[4]; 2184da35113SJeff Mahoney 2194da35113SJeff Mahoney va_start(args, fmt); 2204da35113SJeff Mahoney 221262c5e86SPetr Mladek while ((kern_level = printk_get_level(fmt)) != 0) { 222533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 223262c5e86SPetr Mladek 224262c5e86SPetr Mladek if (kern_level >= '0' && kern_level <= '7') { 225533574c6SJoe Perches memcpy(lvl, fmt, size); 226533574c6SJoe Perches lvl[size] = '\0'; 227533574c6SJoe Perches type = logtypes[kern_level - '0']; 22835f4e5e6SNikolay Borisov ratelimit = &printk_limits[kern_level - '0']; 229262c5e86SPetr Mladek } 230262c5e86SPetr Mladek fmt += size; 231262c5e86SPetr Mladek } 232262c5e86SPetr Mladek 2334da35113SJeff Mahoney vaf.fmt = fmt; 2344da35113SJeff Mahoney vaf.va = &args; 235533574c6SJoe Perches 23635f4e5e6SNikolay Borisov if (__ratelimit(ratelimit)) 2373993b112SColin Ian King printk("%sBTRFS %s (device %s): %pV\n", lvl, type, 2383993b112SColin Ian King fs_info ? fs_info->sb->s_id : "<unknown>", &vaf); 239533574c6SJoe Perches 240533574c6SJoe Perches va_end(args); 2414da35113SJeff Mahoney } 242533574c6SJoe Perches #endif 243533574c6SJoe Perches 2448c342930SJeff Mahoney /* 24549b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 24649b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 24749b25e05SJeff Mahoney * one. 24849b25e05SJeff Mahoney * 24949b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 25049b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 25149b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 25249b25e05SJeff Mahoney * in the call path but will return -EIO. 25349b25e05SJeff Mahoney * 25449b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 25549b25e05SJeff Mahoney * btrfs_commit_transaction. 25649b25e05SJeff Mahoney */ 257c0d19e2bSDavid Sterba __cold 25849b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 25966642832SJeff Mahoney const char *function, 26049b25e05SJeff Mahoney unsigned int line, int errno) 26149b25e05SJeff Mahoney { 26266642832SJeff Mahoney struct btrfs_fs_info *fs_info = trans->fs_info; 26366642832SJeff Mahoney 26449b25e05SJeff Mahoney trans->aborted = errno; 26549b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 26649b25e05SJeff Mahoney * transaction may be able to continue. */ 26764c12921SJeff Mahoney if (!trans->dirty && list_empty(&trans->new_bgs)) { 26869ce977aSMiao Xie const char *errstr; 26969ce977aSMiao Xie 27008748810SDavid Sterba errstr = btrfs_decode_error(errno); 27166642832SJeff Mahoney btrfs_warn(fs_info, 272c2cf52ebSSimon Kirby "%s:%d: Aborting unused transaction(%s).", 27369ce977aSMiao Xie function, line, errstr); 27449b25e05SJeff Mahoney return; 27549b25e05SJeff Mahoney } 27620c7bcecSSeraphime Kirkovski WRITE_ONCE(trans->transaction->aborted, errno); 277501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 27866642832SJeff Mahoney wake_up(&fs_info->transaction_wait); 27966642832SJeff Mahoney wake_up(&fs_info->transaction_blocked_wait); 28066642832SJeff Mahoney __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); 28149b25e05SJeff Mahoney } 28249b25e05SJeff Mahoney /* 2838c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2848c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2858c342930SJeff Mahoney */ 286c0d19e2bSDavid Sterba __cold 2878c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2888c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2898c342930SJeff Mahoney { 2908c342930SJeff Mahoney char *s_id = "<unknown>"; 2918c342930SJeff Mahoney const char *errstr; 2928c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2938c342930SJeff Mahoney va_list args; 2948c342930SJeff Mahoney 2958c342930SJeff Mahoney if (fs_info) 2968c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2978c342930SJeff Mahoney 2988c342930SJeff Mahoney va_start(args, fmt); 2998c342930SJeff Mahoney vaf.va = &args; 3008c342930SJeff Mahoney 30108748810SDavid Sterba errstr = btrfs_decode_error(errno); 302d8953d69SSatoru Takeuchi if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) 30308748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 30408748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 3058c342930SJeff Mahoney 306efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 307efe120a0SFrank Holton function, line, &vaf, errno, errstr); 3088c342930SJeff Mahoney va_end(args); 3098c342930SJeff Mahoney /* Caller calls BUG() */ 3108c342930SJeff Mahoney } 311acce952bSliubo 312e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 313e20d96d6SChris Mason { 3146bccf3abSJeff Mahoney close_ctree(btrfs_sb(sb)); 315e20d96d6SChris Mason } 3162e635a27SChris Mason 31795e05289SChris Mason enum { 31873f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 319287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 320287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 321261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 322261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 32370f6d82eSOmar Sandoval Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, 32470f6d82eSOmar Sandoval Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, 32570f6d82eSOmar Sandoval Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, 32670f6d82eSOmar Sandoval Opt_skip_balance, Opt_check_integrity, 32770f6d82eSOmar Sandoval Opt_check_integrity_including_extent_data, 328f420ee1eSStefan Behrens Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, 329e07a2adeSQu Wenruo Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, 330a258af7aSQu Wenruo Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, 3318dcddfa0SQu Wenruo Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, 332fed8f166SQu Wenruo Opt_nologreplay, Opt_norecovery, 333d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 334d0bd4560SJosef Bacik Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, 335d0bd4560SJosef Bacik #endif 336fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 337fb592373SJosef Bacik Opt_ref_verify, 338fb592373SJosef Bacik #endif 3399555c6c1SIlya Dryomov Opt_err, 34095e05289SChris Mason }; 34195e05289SChris Mason 3424d4ab6d6SDavid Sterba static const match_table_t tokens = { 343dfe25020SChris Mason {Opt_degraded, "degraded"}, 34495e05289SChris Mason {Opt_subvol, "subvol=%s"}, 3451493381fSWang Shilong {Opt_subvolid, "subvolid=%s"}, 34643e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 347b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 348d399167dSQu Wenruo {Opt_datasum, "datasum"}, 349be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 350a258af7aSQu Wenruo {Opt_datacow, "datacow"}, 35121ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 352842bef58SQu Wenruo {Opt_barrier, "barrier"}, 3536f568d35SChris Mason {Opt_max_inline, "max_inline=%s"}, 3548f662a76SChris Mason {Opt_alloc_start, "alloc_start=%s"}, 3554543df7eSChris Mason {Opt_thread_pool, "thread_pool=%d"}, 356c8b97818SChris Mason {Opt_compress, "compress"}, 357261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 358a555f810SChris Mason {Opt_compress_force, "compress-force"}, 359261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 360e18e4809SChris Mason {Opt_ssd, "ssd"}, 361451d7585SChris Mason {Opt_ssd_spread, "ssd_spread"}, 3623b30c22fSChris Mason {Opt_nossd, "nossd"}, 363bd0330adSQu Wenruo {Opt_acl, "acl"}, 36433268eafSJosef Bacik {Opt_noacl, "noacl"}, 3653a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 366a88998f2SQu Wenruo {Opt_treelog, "treelog"}, 36796da0919SQu Wenruo {Opt_nologreplay, "nologreplay"}, 368fed8f166SQu Wenruo {Opt_norecovery, "norecovery"}, 369dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 3702c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 37197e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 372e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 373e07a2adeSQu Wenruo {Opt_nodiscard, "nodiscard"}, 3740af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 37570f6d82eSOmar Sandoval {Opt_space_cache_version, "space_cache=%s"}, 37688c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3774260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 37891435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 37953036293SQu Wenruo {Opt_noenospc_debug, "noenospc_debug"}, 380e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3814cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 382fc0ca9afSQu Wenruo {Opt_nodefrag, "noautodefrag"}, 3834b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3843818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 3858965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 3868dcddfa0SQu Wenruo {Opt_recovery, "recovery"}, /* deprecated */ 3878dcddfa0SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 3889555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 38921adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 39021adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 39121adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 392f420ee1eSStefan Behrens {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 3938c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 3948b87dc17SDavid Sterba {Opt_commit_interval, "commit=%d"}, 395d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 396d0bd4560SJosef Bacik {Opt_fragment_data, "fragment=data"}, 397d0bd4560SJosef Bacik {Opt_fragment_metadata, "fragment=metadata"}, 398d0bd4560SJosef Bacik {Opt_fragment_all, "fragment=all"}, 399d0bd4560SJosef Bacik #endif 400fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 401fb592373SJosef Bacik {Opt_ref_verify, "ref_verify"}, 402fb592373SJosef Bacik #endif 40333268eafSJosef Bacik {Opt_err, NULL}, 40495e05289SChris Mason }; 40595e05289SChris Mason 406edf24abeSChristoph Hellwig /* 407edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 408edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 40949b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 410edf24abeSChristoph Hellwig */ 4112ff7e61eSJeff Mahoney int btrfs_parse_options(struct btrfs_fs_info *info, char *options, 41296da0919SQu Wenruo unsigned long new_flags) 41395e05289SChris Mason { 41495e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 41573bc1876SJosef Bacik char *p, *num, *orig = NULL; 41673bc1876SJosef Bacik u64 cache_gen; 4174543df7eSChris Mason int intarg; 418a7a3f7caSSage Weil int ret = 0; 419261507a0SLi Zefan char *compress_type; 420261507a0SLi Zefan bool compress_force = false; 421b7c47bbbSTsutomu Itoh enum btrfs_compression_type saved_compress_type; 422b7c47bbbSTsutomu Itoh bool saved_compress_force; 423b7c47bbbSTsutomu Itoh int no_compress = 0; 424b6cda9bcSChris Mason 4250b246afaSJeff Mahoney cache_gen = btrfs_super_cache_generation(info->super_copy); 4260b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) 42770f6d82eSOmar Sandoval btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); 42870f6d82eSOmar Sandoval else if (cache_gen) 42973bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 43073bc1876SJosef Bacik 43196da0919SQu Wenruo /* 43296da0919SQu Wenruo * Even the options are empty, we still need to do extra check 43396da0919SQu Wenruo * against new flags 43496da0919SQu Wenruo */ 43595e05289SChris Mason if (!options) 43696da0919SQu Wenruo goto check; 43795e05289SChris Mason 438be20aa9dSChris Mason /* 439be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 440be20aa9dSChris Mason * gets called twice 441be20aa9dSChris Mason */ 4423ec83621SDavid Sterba options = kstrdup(options, GFP_KERNEL); 443be20aa9dSChris Mason if (!options) 444be20aa9dSChris Mason return -ENOMEM; 445be20aa9dSChris Mason 446da495eccSJosef Bacik orig = options; 447be20aa9dSChris Mason 44895e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 44995e05289SChris Mason int token; 45095e05289SChris Mason if (!*p) 45195e05289SChris Mason continue; 45295e05289SChris Mason 45395e05289SChris Mason token = match_token(p, tokens, args); 45495e05289SChris Mason switch (token) { 455dfe25020SChris Mason case Opt_degraded: 4560b246afaSJeff Mahoney btrfs_info(info, "allowing degraded mounts"); 457dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 458dfe25020SChris Mason break; 45995e05289SChris Mason case Opt_subvol: 46073f73415SJosef Bacik case Opt_subvolid: 461e15d0542SXin Zhong case Opt_subvolrootid: 46243e570b0SChristoph Hellwig case Opt_device: 463edf24abeSChristoph Hellwig /* 46443e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 465edf24abeSChristoph Hellwig * and can be happily ignored here. 466edf24abeSChristoph Hellwig */ 46795e05289SChris Mason break; 468b6cda9bcSChris Mason case Opt_nodatasum: 4693cdde224SJeff Mahoney btrfs_set_and_info(info, NODATASUM, 47007802534SQu Wenruo "setting nodatasum"); 471be20aa9dSChris Mason break; 472d399167dSQu Wenruo case Opt_datasum: 4733cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) { 4743cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 4750b246afaSJeff Mahoney btrfs_info(info, 4765d163e0eSJeff Mahoney "setting datasum, datacow enabled"); 477d399167dSQu Wenruo else 4780b246afaSJeff Mahoney btrfs_info(info, "setting datasum"); 47907802534SQu Wenruo } 480d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 481d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 482d399167dSQu Wenruo break; 483be20aa9dSChris Mason case Opt_nodatacow: 4843cdde224SJeff Mahoney if (!btrfs_test_opt(info, NODATACOW)) { 4853cdde224SJeff Mahoney if (!btrfs_test_opt(info, COMPRESS) || 4863cdde224SJeff Mahoney !btrfs_test_opt(info, FORCE_COMPRESS)) { 4870b246afaSJeff Mahoney btrfs_info(info, 488efe120a0SFrank Holton "setting nodatacow, compression disabled"); 489bedb2ccaSAndrei Popa } else { 4900b246afaSJeff Mahoney btrfs_info(info, "setting nodatacow"); 491bedb2ccaSAndrei Popa } 49207802534SQu Wenruo } 493bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 494bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 495be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 496be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 497b6cda9bcSChris Mason break; 498a258af7aSQu Wenruo case Opt_datacow: 4993cdde224SJeff Mahoney btrfs_clear_and_info(info, NODATACOW, 50007802534SQu Wenruo "setting datacow"); 501a258af7aSQu Wenruo break; 502a555f810SChris Mason case Opt_compress_force: 503261507a0SLi Zefan case Opt_compress_force_type: 504261507a0SLi Zefan compress_force = true; 5051c697d4aSEric Sandeen /* Fallthrough */ 506261507a0SLi Zefan case Opt_compress: 507261507a0SLi Zefan case Opt_compress_type: 5083cdde224SJeff Mahoney saved_compress_type = btrfs_test_opt(info, 5093cdde224SJeff Mahoney COMPRESS) ? 510b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 511b7c47bbbSTsutomu Itoh saved_compress_force = 5123cdde224SJeff Mahoney btrfs_test_opt(info, FORCE_COMPRESS); 513261507a0SLi Zefan if (token == Opt_compress || 514261507a0SLi Zefan token == Opt_compress_force || 515a7164fa4SDavid Sterba strncmp(args[0].from, "zlib", 4) == 0) { 516261507a0SLi Zefan compress_type = "zlib"; 517eae8d825SQu Wenruo 518261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 519eae8d825SQu Wenruo info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; 520eae8d825SQu Wenruo /* 521eae8d825SQu Wenruo * args[0] contains uninitialized data since 522eae8d825SQu Wenruo * for these tokens we don't expect any 523eae8d825SQu Wenruo * parameter. 524eae8d825SQu Wenruo */ 525eae8d825SQu Wenruo if (token != Opt_compress && 526eae8d825SQu Wenruo token != Opt_compress_force) 527f51d2b59SDavid Sterba info->compress_level = 528f51d2b59SDavid Sterba btrfs_compress_str2level(args[0].from); 529063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 530bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 531bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 532b7c47bbbSTsutomu Itoh no_compress = 0; 533a7164fa4SDavid Sterba } else if (strncmp(args[0].from, "lzo", 3) == 0) { 534a6fa6faeSLi Zefan compress_type = "lzo"; 535a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 536063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 537bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 538bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 5392b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 540b7c47bbbSTsutomu Itoh no_compress = 0; 5415c1aab1dSNick Terrell } else if (strcmp(args[0].from, "zstd") == 0) { 5425c1aab1dSNick Terrell compress_type = "zstd"; 5435c1aab1dSNick Terrell info->compress_type = BTRFS_COMPRESS_ZSTD; 5445c1aab1dSNick Terrell btrfs_set_opt(info->mount_opt, COMPRESS); 5455c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATACOW); 5465c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATASUM); 5475c1aab1dSNick Terrell btrfs_set_fs_incompat(info, COMPRESS_ZSTD); 5485c1aab1dSNick Terrell no_compress = 0; 549063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 550063849eaSArnd Hannemann compress_type = "no"; 551063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 552063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 553063849eaSArnd Hannemann compress_force = false; 554b7c47bbbSTsutomu Itoh no_compress++; 555261507a0SLi Zefan } else { 556261507a0SLi Zefan ret = -EINVAL; 557261507a0SLi Zefan goto out; 558261507a0SLi Zefan } 559261507a0SLi Zefan 560261507a0SLi Zefan if (compress_force) { 561b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 562143f3636SDavid Sterba } else { 5634027e0f4SWang Shilong /* 5644027e0f4SWang Shilong * If we remount from compress-force=xxx to 5654027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 5664027e0f4SWang Shilong * flag, otherwise, there is no way for users 5674027e0f4SWang Shilong * to disable forcible compression separately. 5684027e0f4SWang Shilong */ 5694027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 570a7e252afSMiao Xie } 5713cdde224SJeff Mahoney if ((btrfs_test_opt(info, COMPRESS) && 572b7c47bbbSTsutomu Itoh (info->compress_type != saved_compress_type || 573b7c47bbbSTsutomu Itoh compress_force != saved_compress_force)) || 5743cdde224SJeff Mahoney (!btrfs_test_opt(info, COMPRESS) && 575b7c47bbbSTsutomu Itoh no_compress == 1)) { 576f51d2b59SDavid Sterba btrfs_info(info, "%s %s compression, level %d", 577b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 578f51d2b59SDavid Sterba compress_type, info->compress_level); 579b7c47bbbSTsutomu Itoh } 580b7c47bbbSTsutomu Itoh compress_force = false; 581a555f810SChris Mason break; 582e18e4809SChris Mason case Opt_ssd: 5833cdde224SJeff Mahoney btrfs_set_and_info(info, SSD, 584583b7231SHans van Kranenburg "enabling ssd optimizations"); 585951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 586e18e4809SChris Mason break; 587451d7585SChris Mason case Opt_ssd_spread: 588583b7231SHans van Kranenburg btrfs_set_and_info(info, SSD, 589583b7231SHans van Kranenburg "enabling ssd optimizations"); 5903cdde224SJeff Mahoney btrfs_set_and_info(info, SSD_SPREAD, 591583b7231SHans van Kranenburg "using spread ssd allocation scheme"); 592951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 593451d7585SChris Mason break; 5943b30c22fSChris Mason case Opt_nossd: 595583b7231SHans van Kranenburg btrfs_set_opt(info->mount_opt, NOSSD); 596583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD, 597583b7231SHans van Kranenburg "not using ssd optimizations"); 598583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD_SPREAD, 599583b7231SHans van Kranenburg "not using spread ssd allocation scheme"); 6003b30c22fSChris Mason break; 601842bef58SQu Wenruo case Opt_barrier: 6023cdde224SJeff Mahoney btrfs_clear_and_info(info, NOBARRIER, 60307802534SQu Wenruo "turning on barriers"); 604842bef58SQu Wenruo break; 60521ad10cfSChris Mason case Opt_nobarrier: 6063cdde224SJeff Mahoney btrfs_set_and_info(info, NOBARRIER, 60707802534SQu Wenruo "turning off barriers"); 60821ad10cfSChris Mason break; 6094543df7eSChris Mason case Opt_thread_pool: 6102c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6112c334e87SWang Shilong if (ret) { 6122c334e87SWang Shilong goto out; 6132c334e87SWang Shilong } else if (intarg > 0) { 6144543df7eSChris Mason info->thread_pool_size = intarg; 6152c334e87SWang Shilong } else { 6162c334e87SWang Shilong ret = -EINVAL; 6172c334e87SWang Shilong goto out; 6182c334e87SWang Shilong } 6194543df7eSChris Mason break; 6206f568d35SChris Mason case Opt_max_inline: 621edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 6226f568d35SChris Mason if (num) { 62391748467SAkinobu Mita info->max_inline = memparse(num, NULL); 6246f568d35SChris Mason kfree(num); 6256f568d35SChris Mason 62615ada040SChris Mason if (info->max_inline) { 627feb5f965SMitch Harder info->max_inline = min_t(u64, 62815ada040SChris Mason info->max_inline, 6290b246afaSJeff Mahoney info->sectorsize); 63015ada040SChris Mason } 6310b246afaSJeff Mahoney btrfs_info(info, "max_inline at %llu", 632c1c9ff7cSGeert Uytterhoeven info->max_inline); 6332c334e87SWang Shilong } else { 6342c334e87SWang Shilong ret = -ENOMEM; 6352c334e87SWang Shilong goto out; 6366f568d35SChris Mason } 6376f568d35SChris Mason break; 6388f662a76SChris Mason case Opt_alloc_start: 6390d0c71b3SDavid Sterba btrfs_info(info, 6400d0c71b3SDavid Sterba "option alloc_start is obsolete, ignored"); 6418f662a76SChris Mason break; 642bd0330adSQu Wenruo case Opt_acl: 64345ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 6441751e8a6SLinus Torvalds info->sb->s_flags |= SB_POSIXACL; 645bd0330adSQu Wenruo break; 64645ff35d6SGuangliang Zhao #else 6470b246afaSJeff Mahoney btrfs_err(info, "support for ACL not compiled in!"); 64845ff35d6SGuangliang Zhao ret = -EINVAL; 64945ff35d6SGuangliang Zhao goto out; 65045ff35d6SGuangliang Zhao #endif 65133268eafSJosef Bacik case Opt_noacl: 6521751e8a6SLinus Torvalds info->sb->s_flags &= ~SB_POSIXACL; 65333268eafSJosef Bacik break; 6543a5e1404SSage Weil case Opt_notreelog: 6553cdde224SJeff Mahoney btrfs_set_and_info(info, NOTREELOG, 65607802534SQu Wenruo "disabling tree log"); 6573a5e1404SSage Weil break; 658a88998f2SQu Wenruo case Opt_treelog: 6593cdde224SJeff Mahoney btrfs_clear_and_info(info, NOTREELOG, 66007802534SQu Wenruo "enabling tree log"); 661a88998f2SQu Wenruo break; 662fed8f166SQu Wenruo case Opt_norecovery: 66396da0919SQu Wenruo case Opt_nologreplay: 6643cdde224SJeff Mahoney btrfs_set_and_info(info, NOLOGREPLAY, 66596da0919SQu Wenruo "disabling log replay at mount time"); 66696da0919SQu Wenruo break; 667dccae999SSage Weil case Opt_flushoncommit: 6683cdde224SJeff Mahoney btrfs_set_and_info(info, FLUSHONCOMMIT, 66907802534SQu Wenruo "turning on flush-on-commit"); 670dccae999SSage Weil break; 6712c9ee856SQu Wenruo case Opt_noflushoncommit: 6723cdde224SJeff Mahoney btrfs_clear_and_info(info, FLUSHONCOMMIT, 67307802534SQu Wenruo "turning off flush-on-commit"); 6742c9ee856SQu Wenruo break; 67597e728d4SJosef Bacik case Opt_ratio: 6762c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6772c334e87SWang Shilong if (ret) { 6782c334e87SWang Shilong goto out; 6792c334e87SWang Shilong } else if (intarg >= 0) { 68097e728d4SJosef Bacik info->metadata_ratio = intarg; 6810b246afaSJeff Mahoney btrfs_info(info, "metadata ratio %d", 68297e728d4SJosef Bacik info->metadata_ratio); 6832c334e87SWang Shilong } else { 6842c334e87SWang Shilong ret = -EINVAL; 6852c334e87SWang Shilong goto out; 68697e728d4SJosef Bacik } 68797e728d4SJosef Bacik break; 688e244a0aeSChristoph Hellwig case Opt_discard: 6893cdde224SJeff Mahoney btrfs_set_and_info(info, DISCARD, 69007802534SQu Wenruo "turning on discard"); 691e244a0aeSChristoph Hellwig break; 692e07a2adeSQu Wenruo case Opt_nodiscard: 6933cdde224SJeff Mahoney btrfs_clear_and_info(info, DISCARD, 69407802534SQu Wenruo "turning off discard"); 695e07a2adeSQu Wenruo break; 6960af3d00bSJosef Bacik case Opt_space_cache: 69770f6d82eSOmar Sandoval case Opt_space_cache_version: 69870f6d82eSOmar Sandoval if (token == Opt_space_cache || 69970f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 7000b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 70170f6d82eSOmar Sandoval FREE_SPACE_TREE); 7023cdde224SJeff Mahoney btrfs_set_and_info(info, SPACE_CACHE, 70307802534SQu Wenruo "enabling disk space caching"); 70470f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 7050b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 70670f6d82eSOmar Sandoval SPACE_CACHE); 7070b246afaSJeff Mahoney btrfs_set_and_info(info, FREE_SPACE_TREE, 70870f6d82eSOmar Sandoval "enabling free space tree"); 70970f6d82eSOmar Sandoval } else { 71070f6d82eSOmar Sandoval ret = -EINVAL; 71170f6d82eSOmar Sandoval goto out; 71270f6d82eSOmar Sandoval } 7130de90876SJosef Bacik break; 714f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 715f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 716f420ee1eSStefan Behrens break; 71773bc1876SJosef Bacik case Opt_no_space_cache: 7183cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) { 7190b246afaSJeff Mahoney btrfs_clear_and_info(info, SPACE_CACHE, 72007802534SQu Wenruo "disabling disk space caching"); 72170f6d82eSOmar Sandoval } 7223cdde224SJeff Mahoney if (btrfs_test_opt(info, FREE_SPACE_TREE)) { 7230b246afaSJeff Mahoney btrfs_clear_and_info(info, FREE_SPACE_TREE, 72470f6d82eSOmar Sandoval "disabling free space tree"); 72570f6d82eSOmar Sandoval } 72673bc1876SJosef Bacik break; 7274b9465cbSChris Mason case Opt_inode_cache: 7287e1876acSDavid Sterba btrfs_set_pending_and_info(info, INODE_MAP_CACHE, 72907802534SQu Wenruo "enabling inode map caching"); 7303818aea2SQu Wenruo break; 7313818aea2SQu Wenruo case Opt_noinode_cache: 7327e1876acSDavid Sterba btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, 73307802534SQu Wenruo "disabling inode map caching"); 7344b9465cbSChris Mason break; 73588c2ba3bSJosef Bacik case Opt_clear_cache: 7363cdde224SJeff Mahoney btrfs_set_and_info(info, CLEAR_CACHE, 73707802534SQu Wenruo "force clearing of disk cache"); 7380af3d00bSJosef Bacik break; 7394260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 7404260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 7414260f7c7SSage Weil break; 74291435650SChris Mason case Opt_enospc_debug: 74391435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 74491435650SChris Mason break; 74553036293SQu Wenruo case Opt_noenospc_debug: 74653036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 74753036293SQu Wenruo break; 7484cb5300bSChris Mason case Opt_defrag: 7493cdde224SJeff Mahoney btrfs_set_and_info(info, AUTO_DEFRAG, 75007802534SQu Wenruo "enabling auto defrag"); 7514cb5300bSChris Mason break; 752fc0ca9afSQu Wenruo case Opt_nodefrag: 7533cdde224SJeff Mahoney btrfs_clear_and_info(info, AUTO_DEFRAG, 75407802534SQu Wenruo "disabling auto defrag"); 755fc0ca9afSQu Wenruo break; 756af31f5e5SChris Mason case Opt_recovery: 7570b246afaSJeff Mahoney btrfs_warn(info, 7588dcddfa0SQu Wenruo "'recovery' is deprecated, use 'usebackuproot' instead"); 7598dcddfa0SQu Wenruo case Opt_usebackuproot: 7600b246afaSJeff Mahoney btrfs_info(info, 7618dcddfa0SQu Wenruo "trying to use backup root at mount time"); 7628dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 763af31f5e5SChris Mason break; 7649555c6c1SIlya Dryomov case Opt_skip_balance: 7659555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 7669555c6c1SIlya Dryomov break; 76721adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 76821adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 7690b246afaSJeff Mahoney btrfs_info(info, 770efe120a0SFrank Holton "enabling check integrity including extent data"); 77121adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 77221adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 77321adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 77421adbd5cSStefan Behrens break; 77521adbd5cSStefan Behrens case Opt_check_integrity: 7760b246afaSJeff Mahoney btrfs_info(info, "enabling check integrity"); 77721adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 77821adbd5cSStefan Behrens break; 77921adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7802c334e87SWang Shilong ret = match_int(&args[0], &intarg); 7812c334e87SWang Shilong if (ret) { 7822c334e87SWang Shilong goto out; 7832c334e87SWang Shilong } else if (intarg >= 0) { 78421adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 7850b246afaSJeff Mahoney btrfs_info(info, 7865d163e0eSJeff Mahoney "check_integrity_print_mask 0x%x", 78721adbd5cSStefan Behrens info->check_integrity_print_mask); 7882c334e87SWang Shilong } else { 7892c334e87SWang Shilong ret = -EINVAL; 7902c334e87SWang Shilong goto out; 79121adbd5cSStefan Behrens } 79221adbd5cSStefan Behrens break; 79321adbd5cSStefan Behrens #else 79421adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 79521adbd5cSStefan Behrens case Opt_check_integrity: 79621adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7970b246afaSJeff Mahoney btrfs_err(info, 798efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 79921adbd5cSStefan Behrens ret = -EINVAL; 80021adbd5cSStefan Behrens goto out; 80121adbd5cSStefan Behrens #endif 8028c342930SJeff Mahoney case Opt_fatal_errors: 8038c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 8048c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 8058c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 8068c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 8078c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 8088c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 8098c342930SJeff Mahoney else { 8108c342930SJeff Mahoney ret = -EINVAL; 8118c342930SJeff Mahoney goto out; 8128c342930SJeff Mahoney } 8138c342930SJeff Mahoney break; 8148b87dc17SDavid Sterba case Opt_commit_interval: 8158b87dc17SDavid Sterba intarg = 0; 8168b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 8178b87dc17SDavid Sterba if (ret < 0) { 8180b246afaSJeff Mahoney btrfs_err(info, "invalid commit interval"); 8198b87dc17SDavid Sterba ret = -EINVAL; 8208b87dc17SDavid Sterba goto out; 8218b87dc17SDavid Sterba } 8228b87dc17SDavid Sterba if (intarg > 0) { 8238b87dc17SDavid Sterba if (intarg > 300) { 8240b246afaSJeff Mahoney btrfs_warn(info, 8255d163e0eSJeff Mahoney "excessive commit interval %d", 8268b87dc17SDavid Sterba intarg); 8278b87dc17SDavid Sterba } 8288b87dc17SDavid Sterba info->commit_interval = intarg; 8298b87dc17SDavid Sterba } else { 8300b246afaSJeff Mahoney btrfs_info(info, 8315d163e0eSJeff Mahoney "using default commit interval %ds", 8328b87dc17SDavid Sterba BTRFS_DEFAULT_COMMIT_INTERVAL); 8338b87dc17SDavid Sterba info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 8348b87dc17SDavid Sterba } 8358b87dc17SDavid Sterba break; 836d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 837d0bd4560SJosef Bacik case Opt_fragment_all: 8380b246afaSJeff Mahoney btrfs_info(info, "fragmenting all space"); 839d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 840d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 841d0bd4560SJosef Bacik break; 842d0bd4560SJosef Bacik case Opt_fragment_metadata: 8430b246afaSJeff Mahoney btrfs_info(info, "fragmenting metadata"); 844d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 845d0bd4560SJosef Bacik FRAGMENT_METADATA); 846d0bd4560SJosef Bacik break; 847d0bd4560SJosef Bacik case Opt_fragment_data: 8480b246afaSJeff Mahoney btrfs_info(info, "fragmenting data"); 849d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 850d0bd4560SJosef Bacik break; 851d0bd4560SJosef Bacik #endif 852fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 853fb592373SJosef Bacik case Opt_ref_verify: 854fb592373SJosef Bacik btrfs_info(info, "doing ref verification"); 855fb592373SJosef Bacik btrfs_set_opt(info->mount_opt, REF_VERIFY); 856fb592373SJosef Bacik break; 857fb592373SJosef Bacik #endif 858a7a3f7caSSage Weil case Opt_err: 8590b246afaSJeff Mahoney btrfs_info(info, "unrecognized mount option '%s'", p); 860a7a3f7caSSage Weil ret = -EINVAL; 861a7a3f7caSSage Weil goto out; 86295e05289SChris Mason default: 863be20aa9dSChris Mason break; 86495e05289SChris Mason } 86595e05289SChris Mason } 86696da0919SQu Wenruo check: 86796da0919SQu Wenruo /* 86896da0919SQu Wenruo * Extra check for current option against current flag 86996da0919SQu Wenruo */ 8701751e8a6SLinus Torvalds if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) { 8710b246afaSJeff Mahoney btrfs_err(info, 87296da0919SQu Wenruo "nologreplay must be used with ro mount option"); 87396da0919SQu Wenruo ret = -EINVAL; 87496da0919SQu Wenruo } 875a7a3f7caSSage Weil out: 8760b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && 8773cdde224SJeff Mahoney !btrfs_test_opt(info, FREE_SPACE_TREE) && 8783cdde224SJeff Mahoney !btrfs_test_opt(info, CLEAR_CACHE)) { 8790b246afaSJeff Mahoney btrfs_err(info, "cannot disable free space tree"); 88070f6d82eSOmar Sandoval ret = -EINVAL; 88170f6d82eSOmar Sandoval 88270f6d82eSOmar Sandoval } 8833cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, SPACE_CACHE)) 8840b246afaSJeff Mahoney btrfs_info(info, "disk space caching is enabled"); 8853cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) 8860b246afaSJeff Mahoney btrfs_info(info, "using free space tree"); 887da495eccSJosef Bacik kfree(orig); 888a7a3f7caSSage Weil return ret; 889edf24abeSChristoph Hellwig } 890edf24abeSChristoph Hellwig 891edf24abeSChristoph Hellwig /* 892edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 893edf24abeSChristoph Hellwig * 894edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 895edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 896edf24abeSChristoph Hellwig */ 89797288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 89873f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 8995e2a4b25SDavid Sterba struct btrfs_fs_devices **fs_devices) 900edf24abeSChristoph Hellwig { 901edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 90283c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 9031493381fSWang Shilong char *num = NULL; 904edf24abeSChristoph Hellwig int error = 0; 905edf24abeSChristoph Hellwig 906edf24abeSChristoph Hellwig if (!options) 907830c4adbSJosef Bacik return 0; 908edf24abeSChristoph Hellwig 909edf24abeSChristoph Hellwig /* 910edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 911edf24abeSChristoph Hellwig * gets called twice 912edf24abeSChristoph Hellwig */ 913edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 914edf24abeSChristoph Hellwig if (!opts) 915edf24abeSChristoph Hellwig return -ENOMEM; 9163f3d0bc0STero Roponen orig = opts; 917edf24abeSChristoph Hellwig 918edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 919edf24abeSChristoph Hellwig int token; 920edf24abeSChristoph Hellwig if (!*p) 921edf24abeSChristoph Hellwig continue; 922edf24abeSChristoph Hellwig 923edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 924edf24abeSChristoph Hellwig switch (token) { 925edf24abeSChristoph Hellwig case Opt_subvol: 926a90e8b6fSIlya Dryomov kfree(*subvol_name); 927edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 9282c334e87SWang Shilong if (!*subvol_name) { 9292c334e87SWang Shilong error = -ENOMEM; 9302c334e87SWang Shilong goto out; 9312c334e87SWang Shilong } 932edf24abeSChristoph Hellwig break; 93373f73415SJosef Bacik case Opt_subvolid: 9341493381fSWang Shilong num = match_strdup(&args[0]); 9351493381fSWang Shilong if (num) { 9361493381fSWang Shilong *subvol_objectid = memparse(num, NULL); 9371493381fSWang Shilong kfree(num); 9384849f01dSJosef Bacik /* we want the original fs_tree */ 9391493381fSWang Shilong if (!*subvol_objectid) 9404849f01dSJosef Bacik *subvol_objectid = 9414849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 9422c334e87SWang Shilong } else { 9432c334e87SWang Shilong error = -EINVAL; 9442c334e87SWang Shilong goto out; 9454849f01dSJosef Bacik } 94673f73415SJosef Bacik break; 947e15d0542SXin Zhong case Opt_subvolrootid: 94862e85577SJeff Mahoney pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n"); 949e15d0542SXin Zhong break; 95043e570b0SChristoph Hellwig case Opt_device: 95183c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 95283c8c9bdSJeff Liu if (!device_name) { 95383c8c9bdSJeff Liu error = -ENOMEM; 95483c8c9bdSJeff Liu goto out; 95583c8c9bdSJeff Liu } 95683c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 95743e570b0SChristoph Hellwig flags, holder, fs_devices); 95883c8c9bdSJeff Liu kfree(device_name); 95943e570b0SChristoph Hellwig if (error) 960830c4adbSJosef Bacik goto out; 96143e570b0SChristoph Hellwig break; 962edf24abeSChristoph Hellwig default: 963edf24abeSChristoph Hellwig break; 964edf24abeSChristoph Hellwig } 965edf24abeSChristoph Hellwig } 966edf24abeSChristoph Hellwig 967edf24abeSChristoph Hellwig out: 968830c4adbSJosef Bacik kfree(orig); 969edf24abeSChristoph Hellwig return error; 97095e05289SChris Mason } 97195e05289SChris Mason 97205dbe683SOmar Sandoval static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 97373f73415SJosef Bacik u64 subvol_objectid) 97473f73415SJosef Bacik { 975815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 97605dbe683SOmar Sandoval struct btrfs_root *fs_root; 97705dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 97805dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 97905dbe683SOmar Sandoval struct btrfs_key key; 98005dbe683SOmar Sandoval struct btrfs_path *path = NULL; 98105dbe683SOmar Sandoval char *name = NULL, *ptr; 98205dbe683SOmar Sandoval u64 dirid; 98305dbe683SOmar Sandoval int len; 98405dbe683SOmar Sandoval int ret; 98505dbe683SOmar Sandoval 98605dbe683SOmar Sandoval path = btrfs_alloc_path(); 98705dbe683SOmar Sandoval if (!path) { 98805dbe683SOmar Sandoval ret = -ENOMEM; 98905dbe683SOmar Sandoval goto err; 99005dbe683SOmar Sandoval } 99105dbe683SOmar Sandoval path->leave_spinning = 1; 99205dbe683SOmar Sandoval 9933ec83621SDavid Sterba name = kmalloc(PATH_MAX, GFP_KERNEL); 99405dbe683SOmar Sandoval if (!name) { 99505dbe683SOmar Sandoval ret = -ENOMEM; 99605dbe683SOmar Sandoval goto err; 99705dbe683SOmar Sandoval } 99805dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 99905dbe683SOmar Sandoval ptr[0] = '\0'; 100005dbe683SOmar Sandoval 100105dbe683SOmar Sandoval /* 100205dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 100305dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 100405dbe683SOmar Sandoval */ 100505dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 100605dbe683SOmar Sandoval key.objectid = subvol_objectid; 100705dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 100805dbe683SOmar Sandoval key.offset = (u64)-1; 100905dbe683SOmar Sandoval 101005dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 101105dbe683SOmar Sandoval if (ret < 0) { 101205dbe683SOmar Sandoval goto err; 101305dbe683SOmar Sandoval } else if (ret > 0) { 101405dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 101505dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 101605dbe683SOmar Sandoval if (ret < 0) { 101705dbe683SOmar Sandoval goto err; 101805dbe683SOmar Sandoval } else if (ret > 0) { 101905dbe683SOmar Sandoval ret = -ENOENT; 102005dbe683SOmar Sandoval goto err; 102105dbe683SOmar Sandoval } 102205dbe683SOmar Sandoval } 102305dbe683SOmar Sandoval 102405dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 102505dbe683SOmar Sandoval subvol_objectid = key.offset; 102605dbe683SOmar Sandoval 102705dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 102805dbe683SOmar Sandoval struct btrfs_root_ref); 102905dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 103005dbe683SOmar Sandoval ptr -= len + 1; 103105dbe683SOmar Sandoval if (ptr < name) { 103205dbe683SOmar Sandoval ret = -ENAMETOOLONG; 103305dbe683SOmar Sandoval goto err; 103405dbe683SOmar Sandoval } 103505dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 103605dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 103705dbe683SOmar Sandoval ptr[0] = '/'; 103805dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 103905dbe683SOmar Sandoval btrfs_release_path(path); 104005dbe683SOmar Sandoval 104105dbe683SOmar Sandoval key.objectid = subvol_objectid; 104205dbe683SOmar Sandoval key.type = BTRFS_ROOT_ITEM_KEY; 104305dbe683SOmar Sandoval key.offset = (u64)-1; 104405dbe683SOmar Sandoval fs_root = btrfs_read_fs_root_no_name(fs_info, &key); 104505dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 104605dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 104705dbe683SOmar Sandoval goto err; 104805dbe683SOmar Sandoval } 104905dbe683SOmar Sandoval 105005dbe683SOmar Sandoval /* 105105dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 105205dbe683SOmar Sandoval * root directory. 105305dbe683SOmar Sandoval */ 105405dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 105505dbe683SOmar Sandoval key.objectid = dirid; 105605dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 105705dbe683SOmar Sandoval key.offset = (u64)-1; 105805dbe683SOmar Sandoval 105905dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 106005dbe683SOmar Sandoval if (ret < 0) { 106105dbe683SOmar Sandoval goto err; 106205dbe683SOmar Sandoval } else if (ret > 0) { 106305dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 106405dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 106505dbe683SOmar Sandoval if (ret < 0) { 106605dbe683SOmar Sandoval goto err; 106705dbe683SOmar Sandoval } else if (ret > 0) { 106805dbe683SOmar Sandoval ret = -ENOENT; 106905dbe683SOmar Sandoval goto err; 107005dbe683SOmar Sandoval } 107105dbe683SOmar Sandoval } 107205dbe683SOmar Sandoval 107305dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 107405dbe683SOmar Sandoval dirid = key.offset; 107505dbe683SOmar Sandoval 107605dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 107705dbe683SOmar Sandoval path->slots[0], 107805dbe683SOmar Sandoval struct btrfs_inode_ref); 107905dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 108005dbe683SOmar Sandoval inode_ref); 108105dbe683SOmar Sandoval ptr -= len + 1; 108205dbe683SOmar Sandoval if (ptr < name) { 108305dbe683SOmar Sandoval ret = -ENAMETOOLONG; 108405dbe683SOmar Sandoval goto err; 108505dbe683SOmar Sandoval } 108605dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 108705dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 108805dbe683SOmar Sandoval ptr[0] = '/'; 108905dbe683SOmar Sandoval btrfs_release_path(path); 109005dbe683SOmar Sandoval } 109105dbe683SOmar Sandoval } 109205dbe683SOmar Sandoval 109305dbe683SOmar Sandoval btrfs_free_path(path); 109405dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 109505dbe683SOmar Sandoval name[0] = '/'; 109605dbe683SOmar Sandoval name[1] = '\0'; 109705dbe683SOmar Sandoval } else { 109805dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 109905dbe683SOmar Sandoval } 110005dbe683SOmar Sandoval return name; 110105dbe683SOmar Sandoval 110205dbe683SOmar Sandoval err: 110305dbe683SOmar Sandoval btrfs_free_path(path); 110405dbe683SOmar Sandoval kfree(name); 110505dbe683SOmar Sandoval return ERR_PTR(ret); 110605dbe683SOmar Sandoval } 110705dbe683SOmar Sandoval 110805dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 110905dbe683SOmar Sandoval { 111005dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 111173f73415SJosef Bacik struct btrfs_dir_item *di; 111273f73415SJosef Bacik struct btrfs_path *path; 111373f73415SJosef Bacik struct btrfs_key location; 111473f73415SJosef Bacik u64 dir_id; 111573f73415SJosef Bacik 111673f73415SJosef Bacik path = btrfs_alloc_path(); 111773f73415SJosef Bacik if (!path) 111805dbe683SOmar Sandoval return -ENOMEM; 111973f73415SJosef Bacik path->leave_spinning = 1; 112073f73415SJosef Bacik 112173f73415SJosef Bacik /* 112273f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 112373f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 112473f73415SJosef Bacik * to mount. 112573f73415SJosef Bacik */ 1126815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 112773f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1128b0839166SJulia Lawall if (IS_ERR(di)) { 1129b0839166SJulia Lawall btrfs_free_path(path); 113005dbe683SOmar Sandoval return PTR_ERR(di); 1131b0839166SJulia Lawall } 113273f73415SJosef Bacik if (!di) { 113373f73415SJosef Bacik /* 113473f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 113573f73415SJosef Bacik * it's always been there, but don't freak out, just try and 113605dbe683SOmar Sandoval * mount the top-level subvolume. 113773f73415SJosef Bacik */ 113873f73415SJosef Bacik btrfs_free_path(path); 113905dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 114005dbe683SOmar Sandoval return 0; 114173f73415SJosef Bacik } 114273f73415SJosef Bacik 114373f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 114473f73415SJosef Bacik btrfs_free_path(path); 114505dbe683SOmar Sandoval *objectid = location.objectid; 114605dbe683SOmar Sandoval return 0; 114773f73415SJosef Bacik } 114873f73415SJosef Bacik 11498a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 11508a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 115156e033a7SDavid Sterba void *data) 11522e635a27SChris Mason { 11532e635a27SChris Mason struct inode *inode; 1154815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 11555d4f98a2SYan Zheng struct btrfs_key key; 115639279cc3SChris Mason int err; 11572e635a27SChris Mason 11582e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 11592e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1160e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1161af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1162be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 11635103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 11642e635a27SChris Mason sb->s_time_gran = 1; 11650eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 11661751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 116749cf6f45SChris Ball #endif 1168357fdad0SMatthew Garrett sb->s_flags |= SB_I_VERSION; 1169da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 11709e11ceeeSJan Kara 11719e11ceeeSJan Kara err = super_setup_bdi(sb); 11729e11ceeeSJan Kara if (err) { 11739e11ceeeSJan Kara btrfs_err(fs_info, "super_setup_bdi failed"); 11749e11ceeeSJan Kara return err; 11759e11ceeeSJan Kara } 11769e11ceeeSJan Kara 1177ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1178ad2b2c80SAl Viro if (err) { 1179ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "open_ctree failed"); 1180ad2b2c80SAl Viro return err; 1181e20d96d6SChris Mason } 1182b888db2bSChris Mason 11835d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 11845d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 11855d4f98a2SYan Zheng key.offset = 0; 118698c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 11875d4f98a2SYan Zheng if (IS_ERR(inode)) { 11885d4f98a2SYan Zheng err = PTR_ERR(inode); 118939279cc3SChris Mason goto fail_close; 119039279cc3SChris Mason } 11912e635a27SChris Mason 119248fde701SAl Viro sb->s_root = d_make_root(inode); 119348fde701SAl Viro if (!sb->s_root) { 119439279cc3SChris Mason err = -ENOMEM; 119539279cc3SChris Mason goto fail_close; 11962e635a27SChris Mason } 119758176a96SJosef Bacik 119890a887c9SDan Magenheimer cleancache_init_fs(sb); 11991751e8a6SLinus Torvalds sb->s_flags |= SB_ACTIVE; 12002e635a27SChris Mason return 0; 12012e635a27SChris Mason 120239279cc3SChris Mason fail_close: 12036bccf3abSJeff Mahoney close_ctree(fs_info); 1204d5719762SChris Mason return err; 1205d5719762SChris Mason } 1206d5719762SChris Mason 12076bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1208d5719762SChris Mason { 1209d5719762SChris Mason struct btrfs_trans_handle *trans; 1210815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1211815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1212df2ce34cSChris Mason 1213bc074524SJeff Mahoney trace_btrfs_sync_fs(fs_info, wait); 12141abe9b8aSliubo 1215d561c025SChris Mason if (!wait) { 1216815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1217df2ce34cSChris Mason return 0; 1218d561c025SChris Mason } 1219771ed689SChris Mason 12206374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 1221771ed689SChris Mason 1222d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 122360376ce4SJosef Bacik if (IS_ERR(trans)) { 1224354aa0fbSMiao Xie /* no transaction, don't bother */ 12256b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 12266b5fe46dSDavid Sterba /* 12276b5fe46dSDavid Sterba * Exit unless we have some pending changes 12286b5fe46dSDavid Sterba * that need to go through commit 12296b5fe46dSDavid Sterba */ 12306b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1231bd7de2c9SJosef Bacik return 0; 1232a53f4f8eSQu Wenruo /* 1233a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1234a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1235a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1236a53f4f8eSQu Wenruo * next commit after thawing. 1237a53f4f8eSQu Wenruo */ 1238a7e3c5f2SRakesh Pandit if (sb_start_write_trylock(sb)) 1239a7e3c5f2SRakesh Pandit sb_end_write(sb); 1240a53f4f8eSQu Wenruo else 1241a53f4f8eSQu Wenruo return 0; 12426b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 124360376ce4SJosef Bacik } 124498bd5c54SDavid Sterba if (IS_ERR(trans)) 124598bd5c54SDavid Sterba return PTR_ERR(trans); 12466b5fe46dSDavid Sterba } 12473a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 1248d5719762SChris Mason } 1249d5719762SChris Mason 125034c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1251a9572a15SEric Paris { 1252815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 12530f628c63SDavid Sterba const char *compress_type; 1254a9572a15SEric Paris 12553cdde224SJeff Mahoney if (btrfs_test_opt(info, DEGRADED)) 1256a9572a15SEric Paris seq_puts(seq, ",degraded"); 12573cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) 1258a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 12593cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 1260a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 12613cdde224SJeff Mahoney if (btrfs_test_opt(info, NOBARRIER)) 1262a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 126395ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1264c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1265a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1266a9572a15SEric Paris num_online_cpus() + 2, 8)) 1267a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 12683cdde224SJeff Mahoney if (btrfs_test_opt(info, COMPRESS)) { 12690f628c63SDavid Sterba compress_type = btrfs_compress_type2str(info->compress_type); 12703cdde224SJeff Mahoney if (btrfs_test_opt(info, FORCE_COMPRESS)) 1271200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1272200da64eSTsutomu Itoh else 1273200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1274f51d2b59SDavid Sterba if (info->compress_level) 1275fa4d885aSAdam Borowski seq_printf(seq, ":%d", info->compress_level); 1276200da64eSTsutomu Itoh } 12773cdde224SJeff Mahoney if (btrfs_test_opt(info, NOSSD)) 1278c289811cSChris Mason seq_puts(seq, ",nossd"); 12793cdde224SJeff Mahoney if (btrfs_test_opt(info, SSD_SPREAD)) 1280451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 12813cdde224SJeff Mahoney else if (btrfs_test_opt(info, SSD)) 1282a9572a15SEric Paris seq_puts(seq, ",ssd"); 12833cdde224SJeff Mahoney if (btrfs_test_opt(info, NOTREELOG)) 12846b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 12853cdde224SJeff Mahoney if (btrfs_test_opt(info, NOLOGREPLAY)) 128696da0919SQu Wenruo seq_puts(seq, ",nologreplay"); 12873cdde224SJeff Mahoney if (btrfs_test_opt(info, FLUSHONCOMMIT)) 12886b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 12893cdde224SJeff Mahoney if (btrfs_test_opt(info, DISCARD)) 129020a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 12911751e8a6SLinus Torvalds if (!(info->sb->s_flags & SB_POSIXACL)) 1292a9572a15SEric Paris seq_puts(seq, ",noacl"); 12933cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) 1294200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 12953cdde224SJeff Mahoney else if (btrfs_test_opt(info, FREE_SPACE_TREE)) 129670f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 129773bc1876SJosef Bacik else 12988965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 12993cdde224SJeff Mahoney if (btrfs_test_opt(info, RESCAN_UUID_TREE)) 1300f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 13013cdde224SJeff Mahoney if (btrfs_test_opt(info, CLEAR_CACHE)) 1302200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 13033cdde224SJeff Mahoney if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) 1304200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 13053cdde224SJeff Mahoney if (btrfs_test_opt(info, ENOSPC_DEBUG)) 13060942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 13073cdde224SJeff Mahoney if (btrfs_test_opt(info, AUTO_DEFRAG)) 13080942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 13093cdde224SJeff Mahoney if (btrfs_test_opt(info, INODE_MAP_CACHE)) 13100942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 13113cdde224SJeff Mahoney if (btrfs_test_opt(info, SKIP_BALANCE)) 13129555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 13138507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 13143cdde224SJeff Mahoney if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 13158507d216SWang Shilong seq_puts(seq, ",check_int_data"); 13163cdde224SJeff Mahoney else if (btrfs_test_opt(info, CHECK_INTEGRITY)) 13178507d216SWang Shilong seq_puts(seq, ",check_int"); 13188507d216SWang Shilong if (info->check_integrity_print_mask) 13198507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 13208507d216SWang Shilong info->check_integrity_print_mask); 13218507d216SWang Shilong #endif 13228507d216SWang Shilong if (info->metadata_ratio) 13238507d216SWang Shilong seq_printf(seq, ",metadata_ratio=%d", 13248507d216SWang Shilong info->metadata_ratio); 13253cdde224SJeff Mahoney if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) 13268c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 13278b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 13288b87dc17SDavid Sterba seq_printf(seq, ",commit=%d", info->commit_interval); 1329d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 13303cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_DATA)) 1331d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 13323cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_METADATA)) 1333d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1334d0bd4560SJosef Bacik #endif 1335fb592373SJosef Bacik if (btrfs_test_opt(info, REF_VERIFY)) 1336fb592373SJosef Bacik seq_puts(seq, ",ref_verify"); 1337c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1338c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 1339c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 1340c8d3fe02SOmar Sandoval seq_dentry(seq, dentry, " \t\n\\"); 1341a9572a15SEric Paris return 0; 1342a9572a15SEric Paris } 1343a9572a15SEric Paris 1344a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 13452e635a27SChris Mason { 1346815745cfSAl Viro struct btrfs_fs_info *p = data; 1347815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 13484b82d6e4SYan 1349815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 13504b82d6e4SYan } 13514b82d6e4SYan 1352450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1353450ba0eaSJosef Bacik { 13546de1d09dSAl Viro int err = set_anon_super(s, data); 13556de1d09dSAl Viro if (!err) 1356450ba0eaSJosef Bacik s->s_fs_info = data; 13576de1d09dSAl Viro return err; 1358450ba0eaSJosef Bacik } 1359450ba0eaSJosef Bacik 1360830c4adbSJosef Bacik /* 1361f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1362f9d9ef62SDavid Sterba */ 1363f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1364f9d9ef62SDavid Sterba { 1365f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1366f9d9ef62SDavid Sterba return 1; 1367f9d9ef62SDavid Sterba return 0; 1368f9d9ef62SDavid Sterba } 1369f9d9ef62SDavid Sterba 1370f9d9ef62SDavid Sterba /* 1371e6e4dbe8SOmar Sandoval * This will add subvolid=0 to the argument string while removing any subvol= 1372e6e4dbe8SOmar Sandoval * and subvolid= arguments to make sure we get the top-level root for path 1373e6e4dbe8SOmar Sandoval * walking to the subvol we want. 1374830c4adbSJosef Bacik */ 1375830c4adbSJosef Bacik static char *setup_root_args(char *args) 1376830c4adbSJosef Bacik { 1377e6e4dbe8SOmar Sandoval char *buf, *dst, *sep; 1378830c4adbSJosef Bacik 1379e6e4dbe8SOmar Sandoval if (!args) 13803ec83621SDavid Sterba return kstrdup("subvolid=0", GFP_KERNEL); 1381830c4adbSJosef Bacik 1382e6e4dbe8SOmar Sandoval /* The worst case is that we add ",subvolid=0" to the end. */ 13833ec83621SDavid Sterba buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, 13843ec83621SDavid Sterba GFP_KERNEL); 1385f60d16a8SJim Meyering if (!buf) 1386f60d16a8SJim Meyering return NULL; 1387830c4adbSJosef Bacik 1388e6e4dbe8SOmar Sandoval while (1) { 1389e6e4dbe8SOmar Sandoval sep = strchrnul(args, ','); 1390e6e4dbe8SOmar Sandoval if (!strstarts(args, "subvol=") && 1391e6e4dbe8SOmar Sandoval !strstarts(args, "subvolid=")) { 1392e6e4dbe8SOmar Sandoval memcpy(dst, args, sep - args); 1393e6e4dbe8SOmar Sandoval dst += sep - args; 1394e6e4dbe8SOmar Sandoval *dst++ = ','; 1395830c4adbSJosef Bacik } 1396e6e4dbe8SOmar Sandoval if (*sep) 1397e6e4dbe8SOmar Sandoval args = sep + 1; 1398e6e4dbe8SOmar Sandoval else 1399e6e4dbe8SOmar Sandoval break; 1400e6e4dbe8SOmar Sandoval } 1401f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 1402830c4adbSJosef Bacik 1403f60d16a8SJim Meyering return buf; 1404830c4adbSJosef Bacik } 1405830c4adbSJosef Bacik 1406bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1407bb289b7bSOmar Sandoval int flags, const char *device_name, 1408bb289b7bSOmar Sandoval char *data) 1409830c4adbSJosef Bacik { 1410830c4adbSJosef Bacik struct dentry *root; 1411fa330659SOmar Sandoval struct vfsmount *mnt = NULL; 1412830c4adbSJosef Bacik char *newargs; 1413fa330659SOmar Sandoval int ret; 1414830c4adbSJosef Bacik 1415830c4adbSJosef Bacik newargs = setup_root_args(data); 1416fa330659SOmar Sandoval if (!newargs) { 1417fa330659SOmar Sandoval root = ERR_PTR(-ENOMEM); 1418fa330659SOmar Sandoval goto out; 1419fa330659SOmar Sandoval } 14200723a047SHarald Hoyer 1421fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); 1422fa330659SOmar Sandoval if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { 14231751e8a6SLinus Torvalds if (flags & SB_RDONLY) { 14241751e8a6SLinus Torvalds mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~SB_RDONLY, 1425fa330659SOmar Sandoval device_name, newargs); 14260723a047SHarald Hoyer } else { 14271751e8a6SLinus Torvalds mnt = vfs_kern_mount(&btrfs_fs_type, flags | SB_RDONLY, 1428fa330659SOmar Sandoval device_name, newargs); 14290040e606SChristoph Jaeger if (IS_ERR(mnt)) { 1430fa330659SOmar Sandoval root = ERR_CAST(mnt); 1431fa330659SOmar Sandoval mnt = NULL; 1432fa330659SOmar Sandoval goto out; 14330040e606SChristoph Jaeger } 14340723a047SHarald Hoyer 1435773cd04eSOmar Sandoval down_write(&mnt->mnt_sb->s_umount); 1436fa330659SOmar Sandoval ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); 1437773cd04eSOmar Sandoval up_write(&mnt->mnt_sb->s_umount); 1438fa330659SOmar Sandoval if (ret < 0) { 1439fa330659SOmar Sandoval root = ERR_PTR(ret); 1440fa330659SOmar Sandoval goto out; 14410723a047SHarald Hoyer } 14420723a047SHarald Hoyer } 14430723a047SHarald Hoyer } 1444fa330659SOmar Sandoval if (IS_ERR(mnt)) { 1445fa330659SOmar Sandoval root = ERR_CAST(mnt); 1446fa330659SOmar Sandoval mnt = NULL; 1447fa330659SOmar Sandoval goto out; 1448fa330659SOmar Sandoval } 1449830c4adbSJosef Bacik 145005dbe683SOmar Sandoval if (!subvol_name) { 145105dbe683SOmar Sandoval if (!subvol_objectid) { 145205dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 145305dbe683SOmar Sandoval &subvol_objectid); 145405dbe683SOmar Sandoval if (ret) { 145505dbe683SOmar Sandoval root = ERR_PTR(ret); 145605dbe683SOmar Sandoval goto out; 145705dbe683SOmar Sandoval } 145805dbe683SOmar Sandoval } 145905dbe683SOmar Sandoval subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), 146005dbe683SOmar Sandoval subvol_objectid); 146105dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 146205dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 146305dbe683SOmar Sandoval subvol_name = NULL; 146405dbe683SOmar Sandoval goto out; 146505dbe683SOmar Sandoval } 146605dbe683SOmar Sandoval 146705dbe683SOmar Sandoval } 146805dbe683SOmar Sandoval 1469ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1470fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1471fa330659SOmar Sandoval mnt = NULL; 1472830c4adbSJosef Bacik 1473bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1474ea441d11SAl Viro struct super_block *s = root->d_sb; 1475ab8d0fc4SJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(s); 1476bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1477bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1478bb289b7bSOmar Sandoval 1479bb289b7bSOmar Sandoval ret = 0; 1480bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1481ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "'%s' is not a valid subvolume", 1482bb289b7bSOmar Sandoval subvol_name); 1483bb289b7bSOmar Sandoval ret = -EINVAL; 1484bb289b7bSOmar Sandoval } 1485bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 148605dbe683SOmar Sandoval /* 148705dbe683SOmar Sandoval * This will also catch a race condition where a 148805dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 148905dbe683SOmar Sandoval * another subvolume is renamed over the old location. 149005dbe683SOmar Sandoval */ 1491ab8d0fc4SJeff Mahoney btrfs_err(fs_info, 1492ab8d0fc4SJeff Mahoney "subvol '%s' does not match subvolid %llu", 1493bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1494bb289b7bSOmar Sandoval ret = -EINVAL; 1495bb289b7bSOmar Sandoval } 1496bb289b7bSOmar Sandoval if (ret) { 1497ea441d11SAl Viro dput(root); 1498bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1499ea441d11SAl Viro deactivate_locked_super(s); 1500bb289b7bSOmar Sandoval } 1501f9d9ef62SDavid Sterba } 1502f9d9ef62SDavid Sterba 1503fa330659SOmar Sandoval out: 1504fa330659SOmar Sandoval mntput(mnt); 1505fa330659SOmar Sandoval kfree(newargs); 1506fa330659SOmar Sandoval kfree(subvol_name); 1507830c4adbSJosef Bacik return root; 1508830c4adbSJosef Bacik } 1509450ba0eaSJosef Bacik 1510f667aef6SQu Wenruo static int parse_security_options(char *orig_opts, 1511f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1512f667aef6SQu Wenruo { 1513f667aef6SQu Wenruo char *secdata = NULL; 1514f667aef6SQu Wenruo int ret = 0; 1515f667aef6SQu Wenruo 1516f667aef6SQu Wenruo secdata = alloc_secdata(); 1517f667aef6SQu Wenruo if (!secdata) 1518f667aef6SQu Wenruo return -ENOMEM; 1519f667aef6SQu Wenruo ret = security_sb_copy_data(orig_opts, secdata); 1520f667aef6SQu Wenruo if (ret) { 1521f667aef6SQu Wenruo free_secdata(secdata); 1522f667aef6SQu Wenruo return ret; 1523f667aef6SQu Wenruo } 1524f667aef6SQu Wenruo ret = security_sb_parse_opts_str(secdata, sec_opts); 1525f667aef6SQu Wenruo free_secdata(secdata); 1526f667aef6SQu Wenruo return ret; 1527f667aef6SQu Wenruo } 1528f667aef6SQu Wenruo 1529f667aef6SQu Wenruo static int setup_security_options(struct btrfs_fs_info *fs_info, 1530f667aef6SQu Wenruo struct super_block *sb, 1531f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1532f667aef6SQu Wenruo { 1533f667aef6SQu Wenruo int ret = 0; 1534f667aef6SQu Wenruo 1535f667aef6SQu Wenruo /* 1536f667aef6SQu Wenruo * Call security_sb_set_mnt_opts() to check whether new sec_opts 1537f667aef6SQu Wenruo * is valid. 1538f667aef6SQu Wenruo */ 1539f667aef6SQu Wenruo ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); 1540f667aef6SQu Wenruo if (ret) 1541f667aef6SQu Wenruo return ret; 1542f667aef6SQu Wenruo 1543a43bb39bSQu Wenruo #ifdef CONFIG_SECURITY 1544f667aef6SQu Wenruo if (!fs_info->security_opts.num_mnt_opts) { 1545f667aef6SQu Wenruo /* first time security setup, copy sec_opts to fs_info */ 1546f667aef6SQu Wenruo memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); 1547f667aef6SQu Wenruo } else { 1548f667aef6SQu Wenruo /* 1549180e4d47SLuis de Bethencourt * Since SELinux (the only one supporting security_mnt_opts) 1550180e4d47SLuis de Bethencourt * does NOT support changing context during remount/mount of 1551180e4d47SLuis de Bethencourt * the same sb, this must be the same or part of the same 1552180e4d47SLuis de Bethencourt * security options, just free it. 1553f667aef6SQu Wenruo */ 1554f667aef6SQu Wenruo security_free_mnt_opts(sec_opts); 1555f667aef6SQu Wenruo } 1556a43bb39bSQu Wenruo #endif 1557f667aef6SQu Wenruo return ret; 1558f667aef6SQu Wenruo } 1559f667aef6SQu Wenruo 1560*72fa39f5SMisono, Tomohiro static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 1561*72fa39f5SMisono, Tomohiro int flags, const char *device_name, void *data) 1562*72fa39f5SMisono, Tomohiro { 1563*72fa39f5SMisono, Tomohiro struct block_device *bdev = NULL; 1564*72fa39f5SMisono, Tomohiro struct super_block *s; 1565*72fa39f5SMisono, Tomohiro struct btrfs_fs_devices *fs_devices = NULL; 1566*72fa39f5SMisono, Tomohiro struct btrfs_fs_info *fs_info = NULL; 1567*72fa39f5SMisono, Tomohiro struct security_mnt_opts new_sec_opts; 1568*72fa39f5SMisono, Tomohiro fmode_t mode = FMODE_READ; 1569*72fa39f5SMisono, Tomohiro char *subvol_name = NULL; 1570*72fa39f5SMisono, Tomohiro u64 subvol_objectid = 0; 1571*72fa39f5SMisono, Tomohiro int error = 0; 1572*72fa39f5SMisono, Tomohiro 1573*72fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY)) 1574*72fa39f5SMisono, Tomohiro mode |= FMODE_WRITE; 1575*72fa39f5SMisono, Tomohiro 1576*72fa39f5SMisono, Tomohiro error = btrfs_parse_early_options(data, mode, fs_type, 1577*72fa39f5SMisono, Tomohiro &subvol_name, &subvol_objectid, 1578*72fa39f5SMisono, Tomohiro &fs_devices); 1579*72fa39f5SMisono, Tomohiro if (error) { 1580*72fa39f5SMisono, Tomohiro kfree(subvol_name); 1581*72fa39f5SMisono, Tomohiro return ERR_PTR(error); 1582*72fa39f5SMisono, Tomohiro } 1583*72fa39f5SMisono, Tomohiro 1584*72fa39f5SMisono, Tomohiro security_init_mnt_opts(&new_sec_opts); 1585*72fa39f5SMisono, Tomohiro if (data) { 1586*72fa39f5SMisono, Tomohiro error = parse_security_options(data, &new_sec_opts); 1587*72fa39f5SMisono, Tomohiro if (error) 1588*72fa39f5SMisono, Tomohiro return ERR_PTR(error); 1589*72fa39f5SMisono, Tomohiro } 1590*72fa39f5SMisono, Tomohiro 1591*72fa39f5SMisono, Tomohiro error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1592*72fa39f5SMisono, Tomohiro if (error) 1593*72fa39f5SMisono, Tomohiro goto error_sec_opts; 1594*72fa39f5SMisono, Tomohiro 1595*72fa39f5SMisono, Tomohiro /* 1596*72fa39f5SMisono, Tomohiro * Setup a dummy root and fs_info for test/set super. This is because 1597*72fa39f5SMisono, Tomohiro * we don't actually fill this stuff out until open_ctree, but we need 1598*72fa39f5SMisono, Tomohiro * it for searching for existing supers, so this lets us do that and 1599*72fa39f5SMisono, Tomohiro * then open_ctree will properly initialize everything later. 1600*72fa39f5SMisono, Tomohiro */ 1601*72fa39f5SMisono, Tomohiro fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 1602*72fa39f5SMisono, Tomohiro if (!fs_info) { 1603*72fa39f5SMisono, Tomohiro error = -ENOMEM; 1604*72fa39f5SMisono, Tomohiro goto error_sec_opts; 1605*72fa39f5SMisono, Tomohiro } 1606*72fa39f5SMisono, Tomohiro 1607*72fa39f5SMisono, Tomohiro fs_info->fs_devices = fs_devices; 1608*72fa39f5SMisono, Tomohiro 1609*72fa39f5SMisono, Tomohiro fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 1610*72fa39f5SMisono, Tomohiro fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 1611*72fa39f5SMisono, Tomohiro security_init_mnt_opts(&fs_info->security_opts); 1612*72fa39f5SMisono, Tomohiro if (!fs_info->super_copy || !fs_info->super_for_commit) { 1613*72fa39f5SMisono, Tomohiro error = -ENOMEM; 1614*72fa39f5SMisono, Tomohiro goto error_fs_info; 1615*72fa39f5SMisono, Tomohiro } 1616*72fa39f5SMisono, Tomohiro 1617*72fa39f5SMisono, Tomohiro error = btrfs_open_devices(fs_devices, mode, fs_type); 1618*72fa39f5SMisono, Tomohiro if (error) 1619*72fa39f5SMisono, Tomohiro goto error_fs_info; 1620*72fa39f5SMisono, Tomohiro 1621*72fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 1622*72fa39f5SMisono, Tomohiro error = -EACCES; 1623*72fa39f5SMisono, Tomohiro goto error_close_devices; 1624*72fa39f5SMisono, Tomohiro } 1625*72fa39f5SMisono, Tomohiro 1626*72fa39f5SMisono, Tomohiro bdev = fs_devices->latest_bdev; 1627*72fa39f5SMisono, Tomohiro s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 1628*72fa39f5SMisono, Tomohiro fs_info); 1629*72fa39f5SMisono, Tomohiro if (IS_ERR(s)) { 1630*72fa39f5SMisono, Tomohiro error = PTR_ERR(s); 1631*72fa39f5SMisono, Tomohiro goto error_close_devices; 1632*72fa39f5SMisono, Tomohiro } 1633*72fa39f5SMisono, Tomohiro 1634*72fa39f5SMisono, Tomohiro if (s->s_root) { 1635*72fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 1636*72fa39f5SMisono, Tomohiro free_fs_info(fs_info); 1637*72fa39f5SMisono, Tomohiro if ((flags ^ s->s_flags) & SB_RDONLY) 1638*72fa39f5SMisono, Tomohiro error = -EBUSY; 1639*72fa39f5SMisono, Tomohiro } else { 1640*72fa39f5SMisono, Tomohiro snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1641*72fa39f5SMisono, Tomohiro btrfs_sb(s)->bdev_holder = fs_type; 1642*72fa39f5SMisono, Tomohiro error = btrfs_fill_super(s, fs_devices, data); 1643*72fa39f5SMisono, Tomohiro } 1644*72fa39f5SMisono, Tomohiro if (error) { 1645*72fa39f5SMisono, Tomohiro deactivate_locked_super(s); 1646*72fa39f5SMisono, Tomohiro goto error_sec_opts; 1647*72fa39f5SMisono, Tomohiro } 1648*72fa39f5SMisono, Tomohiro 1649*72fa39f5SMisono, Tomohiro fs_info = btrfs_sb(s); 1650*72fa39f5SMisono, Tomohiro error = setup_security_options(fs_info, s, &new_sec_opts); 1651*72fa39f5SMisono, Tomohiro if (error) { 1652*72fa39f5SMisono, Tomohiro deactivate_locked_super(s); 1653*72fa39f5SMisono, Tomohiro goto error_sec_opts; 1654*72fa39f5SMisono, Tomohiro } 1655*72fa39f5SMisono, Tomohiro 1656*72fa39f5SMisono, Tomohiro return dget(s->s_root); 1657*72fa39f5SMisono, Tomohiro 1658*72fa39f5SMisono, Tomohiro error_close_devices: 1659*72fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 1660*72fa39f5SMisono, Tomohiro error_fs_info: 1661*72fa39f5SMisono, Tomohiro free_fs_info(fs_info); 1662*72fa39f5SMisono, Tomohiro error_sec_opts: 1663*72fa39f5SMisono, Tomohiro security_free_mnt_opts(&new_sec_opts); 1664*72fa39f5SMisono, Tomohiro return ERR_PTR(error); 1665*72fa39f5SMisono, Tomohiro } 1666edf24abeSChristoph Hellwig /* 1667edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1668edf24abeSChristoph Hellwig * 1669edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1670edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1671edf24abeSChristoph Hellwig */ 1672061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1673306e16ceSDavid Sterba const char *device_name, void *data) 16744b82d6e4SYan { 16754b82d6e4SYan struct block_device *bdev = NULL; 16764b82d6e4SYan struct super_block *s; 16778a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1678450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 1679f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 168097288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 168173f73415SJosef Bacik char *subvol_name = NULL; 168273f73415SJosef Bacik u64 subvol_objectid = 0; 16834b82d6e4SYan int error = 0; 16844b82d6e4SYan 16851751e8a6SLinus Torvalds if (!(flags & SB_RDONLY)) 168697288f2cSChristoph Hellwig mode |= FMODE_WRITE; 168797288f2cSChristoph Hellwig 168897288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 168973f73415SJosef Bacik &subvol_name, &subvol_objectid, 16905e2a4b25SDavid Sterba &fs_devices); 1691f23c8af8SIlya Dryomov if (error) { 1692f23c8af8SIlya Dryomov kfree(subvol_name); 1693061dbc6bSAl Viro return ERR_PTR(error); 1694f23c8af8SIlya Dryomov } 1695edf24abeSChristoph Hellwig 169605dbe683SOmar Sandoval if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 1697fa330659SOmar Sandoval /* mount_subvol() will free subvol_name. */ 1698bb289b7bSOmar Sandoval return mount_subvol(subvol_name, subvol_objectid, flags, 1699bb289b7bSOmar Sandoval device_name, data); 1700830c4adbSJosef Bacik } 1701830c4adbSJosef Bacik 1702f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1703f667aef6SQu Wenruo if (data) { 1704f667aef6SQu Wenruo error = parse_security_options(data, &new_sec_opts); 17058a4b83ccSChris Mason if (error) 1706830c4adbSJosef Bacik return ERR_PTR(error); 1707f667aef6SQu Wenruo } 1708f667aef6SQu Wenruo 1709f667aef6SQu Wenruo error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1710f667aef6SQu Wenruo if (error) 1711f667aef6SQu Wenruo goto error_sec_opts; 17124b82d6e4SYan 1713450ba0eaSJosef Bacik /* 1714450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1715450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1716450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1717450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1718450ba0eaSJosef Bacik */ 17193ec83621SDavid Sterba fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 1720f667aef6SQu Wenruo if (!fs_info) { 1721f667aef6SQu Wenruo error = -ENOMEM; 1722f667aef6SQu Wenruo goto error_sec_opts; 1723f667aef6SQu Wenruo } 172404d21a24SIlya Dryomov 1725450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1726450ba0eaSJosef Bacik 17273ec83621SDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 17283ec83621SDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 1729f667aef6SQu Wenruo security_init_mnt_opts(&fs_info->security_opts); 17306c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 17316c41761fSDavid Sterba error = -ENOMEM; 173204d21a24SIlya Dryomov goto error_fs_info; 173304d21a24SIlya Dryomov } 173404d21a24SIlya Dryomov 173504d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 173604d21a24SIlya Dryomov if (error) 173704d21a24SIlya Dryomov goto error_fs_info; 173804d21a24SIlya Dryomov 17391751e8a6SLinus Torvalds if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 174004d21a24SIlya Dryomov error = -EACCES; 17416c41761fSDavid Sterba goto error_close_devices; 17426c41761fSDavid Sterba } 17436c41761fSDavid Sterba 1744dfe25020SChris Mason bdev = fs_devices->latest_bdev; 17451751e8a6SLinus Torvalds s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 17469249e17fSDavid Howells fs_info); 1747830c4adbSJosef Bacik if (IS_ERR(s)) { 1748830c4adbSJosef Bacik error = PTR_ERR(s); 1749830c4adbSJosef Bacik goto error_close_devices; 1750830c4adbSJosef Bacik } 17514b82d6e4SYan 17524b82d6e4SYan if (s->s_root) { 17532b82032cSYan Zheng btrfs_close_devices(fs_devices); 17546c41761fSDavid Sterba free_fs_info(fs_info); 17551751e8a6SLinus Torvalds if ((flags ^ s->s_flags) & SB_RDONLY) 175659553edfSAl Viro error = -EBUSY; 17574b82d6e4SYan } else { 1758a1c6f057SDmitry Monakhov snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1759815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 176056e033a7SDavid Sterba error = btrfs_fill_super(s, fs_devices, data); 17614b82d6e4SYan } 176205dbe683SOmar Sandoval if (error) { 1763e15d0542SXin Zhong deactivate_locked_super(s); 1764f667aef6SQu Wenruo goto error_sec_opts; 1765f667aef6SQu Wenruo } 1766f667aef6SQu Wenruo 1767f667aef6SQu Wenruo fs_info = btrfs_sb(s); 1768f667aef6SQu Wenruo error = setup_security_options(fs_info, s, &new_sec_opts); 1769f667aef6SQu Wenruo if (error) { 1770f667aef6SQu Wenruo deactivate_locked_super(s); 1771f667aef6SQu Wenruo goto error_sec_opts; 1772f667aef6SQu Wenruo } 17734b82d6e4SYan 177405dbe683SOmar Sandoval return dget(s->s_root); 17754b82d6e4SYan 1776c146afadSYan Zheng error_close_devices: 17778a4b83ccSChris Mason btrfs_close_devices(fs_devices); 177804d21a24SIlya Dryomov error_fs_info: 17796c41761fSDavid Sterba free_fs_info(fs_info); 1780f667aef6SQu Wenruo error_sec_opts: 1781f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1782061dbc6bSAl Viro return ERR_PTR(error); 17834b82d6e4SYan } 17842e635a27SChris Mason 17850d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 17860d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 17870d2450abSSergei Trofimovich { 17880d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 17890d2450abSSergei Trofimovich return; 17900d2450abSSergei Trofimovich 17910d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 17920d2450abSSergei Trofimovich 1793efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 17940d2450abSSergei Trofimovich old_pool_size, new_pool_size); 17950d2450abSSergei Trofimovich 17965cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1797afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1798a8c93d4eSQu Wenruo btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1799e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1800fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1801fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1802fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1803fccb5d86SQu Wenruo new_pool_size); 1804fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1805fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 18065b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1807736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 18080339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1809ff023aacSStefan Behrens new_pool_size); 18100d2450abSSergei Trofimovich } 18110d2450abSSergei Trofimovich 1812f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1813dc81cdc5SMiao Xie { 1814dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1815f42a34b2SMiao Xie } 1816dc81cdc5SMiao Xie 1817f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1818f42a34b2SMiao Xie unsigned long old_opts, int flags) 1819f42a34b2SMiao Xie { 1820dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1821dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 18221751e8a6SLinus Torvalds (flags & SB_RDONLY))) { 1823dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1824dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1825dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 18261751e8a6SLinus Torvalds if (flags & SB_RDONLY) 1827dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1828dc81cdc5SMiao Xie } 1829dc81cdc5SMiao Xie } 1830dc81cdc5SMiao Xie 1831dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1832dc81cdc5SMiao Xie unsigned long old_opts) 1833dc81cdc5SMiao Xie { 1834dc81cdc5SMiao Xie /* 1835180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1836180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1837dc81cdc5SMiao Xie */ 1838dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1839bc98a42cSDavid Howells (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { 1840dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1841dc81cdc5SMiao Xie } 1842dc81cdc5SMiao Xie 1843dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1844dc81cdc5SMiao Xie } 1845dc81cdc5SMiao Xie 1846c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1847c146afadSYan Zheng { 1848815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1849815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 185049b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 185149b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 185249b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 185349b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 185449b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 185549b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1856c146afadSYan Zheng int ret; 1857c146afadSYan Zheng 185802b9984dSTheodore Ts'o sync_filesystem(sb); 1859f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1860dc81cdc5SMiao Xie 1861f667aef6SQu Wenruo if (data) { 1862f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 1863f667aef6SQu Wenruo 1864f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1865f667aef6SQu Wenruo ret = parse_security_options(data, &new_sec_opts); 1866f667aef6SQu Wenruo if (ret) 1867f667aef6SQu Wenruo goto restore; 1868f667aef6SQu Wenruo ret = setup_security_options(fs_info, sb, 1869f667aef6SQu Wenruo &new_sec_opts); 1870f667aef6SQu Wenruo if (ret) { 1871f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1872f667aef6SQu Wenruo goto restore; 1873f667aef6SQu Wenruo } 1874f667aef6SQu Wenruo } 1875f667aef6SQu Wenruo 18762ff7e61eSJeff Mahoney ret = btrfs_parse_options(fs_info, data, *flags); 187749b25e05SJeff Mahoney if (ret) { 187849b25e05SJeff Mahoney ret = -EINVAL; 187949b25e05SJeff Mahoney goto restore; 188049b25e05SJeff Mahoney } 1881b288052eSChris Mason 1882f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 18830d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 18840d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 18850d2450abSSergei Trofimovich 18861751e8a6SLinus Torvalds if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1887dc81cdc5SMiao Xie goto out; 1888c146afadSYan Zheng 18891751e8a6SLinus Torvalds if (*flags & SB_RDONLY) { 18908dabb742SStefan Behrens /* 18918dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 18928dabb742SStefan Behrens * the filesystem is busy. 18938dabb742SStefan Behrens */ 189421c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 1895361c093dSStefan Behrens 1896361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1897361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1898361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1899361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1900361c093dSStefan Behrens 19011751e8a6SLinus Torvalds sb->s_flags |= SB_RDONLY; 1902c146afadSYan Zheng 1903e44163e1SJeff Mahoney /* 19041751e8a6SLinus Torvalds * Setting SB_RDONLY will put the cleaner thread to 1905e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1906e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1907e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1908e44163e1SJeff Mahoney * unless we clean them up here. 1909e44163e1SJeff Mahoney */ 1910e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1911e44163e1SJeff Mahoney 19128dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 19138dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1914061594efSMiao Xie btrfs_pause_balance(fs_info); 19158dabb742SStefan Behrens 19166bccf3abSJeff Mahoney ret = btrfs_commit_super(fs_info); 191749b25e05SJeff Mahoney if (ret) 191849b25e05SJeff Mahoney goto restore; 1919c146afadSYan Zheng } else { 19200b246afaSJeff Mahoney if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 19216ef3de9cSDavid Sterba btrfs_err(fs_info, 1922efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 19236ef3de9cSDavid Sterba ret = -EINVAL; 19246ef3de9cSDavid Sterba goto restore; 19256ef3de9cSDavid Sterba } 19268a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 192749b25e05SJeff Mahoney ret = -EACCES; 192849b25e05SJeff Mahoney goto restore; 19298a3db184SSergei Trofimovich } 19302b82032cSYan Zheng 1931b382cfe8SQu Wenruo if (!btrfs_check_rw_degradable(fs_info)) { 1932efe120a0SFrank Holton btrfs_warn(fs_info, 1933efe120a0SFrank Holton "too many missing devices, writeable remount is not allowed"); 1934292fd7fcSStefan Behrens ret = -EACCES; 1935292fd7fcSStefan Behrens goto restore; 1936292fd7fcSStefan Behrens } 1937292fd7fcSStefan Behrens 19388a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 193949b25e05SJeff Mahoney ret = -EINVAL; 194049b25e05SJeff Mahoney goto restore; 19418a3db184SSergei Trofimovich } 1942c146afadSYan Zheng 1943815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 194449b25e05SJeff Mahoney if (ret) 194549b25e05SJeff Mahoney goto restore; 1946c146afadSYan Zheng 1947d68fc57bSYan, Zheng /* recover relocation */ 19485f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 1949d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 19505f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 195149b25e05SJeff Mahoney if (ret) 195249b25e05SJeff Mahoney goto restore; 1953c146afadSYan Zheng 19542b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 19552b6ba629SIlya Dryomov if (ret) 19562b6ba629SIlya Dryomov goto restore; 19572b6ba629SIlya Dryomov 19588dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 19598dabb742SStefan Behrens if (ret) { 1960efe120a0SFrank Holton btrfs_warn(fs_info, "failed to resume dev_replace"); 19618dabb742SStefan Behrens goto restore; 19628dabb742SStefan Behrens } 196394aebfb2SJosef Bacik 19646c6b5a39SAleksa Sarai btrfs_qgroup_rescan_resume(fs_info); 19656c6b5a39SAleksa Sarai 196694aebfb2SJosef Bacik if (!fs_info->uuid_root) { 1967efe120a0SFrank Holton btrfs_info(fs_info, "creating UUID tree"); 196894aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 196994aebfb2SJosef Bacik if (ret) { 19705d163e0eSJeff Mahoney btrfs_warn(fs_info, 19715d163e0eSJeff Mahoney "failed to create the UUID tree %d", 19725d163e0eSJeff Mahoney ret); 197394aebfb2SJosef Bacik goto restore; 197494aebfb2SJosef Bacik } 197594aebfb2SJosef Bacik } 19761751e8a6SLinus Torvalds sb->s_flags &= ~SB_RDONLY; 197790c711abSZygo Blaxell 1978afcdd129SJosef Bacik set_bit(BTRFS_FS_OPEN, &fs_info->flags); 1979c146afadSYan Zheng } 1980dc81cdc5SMiao Xie out: 19812c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 1982dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1983c146afadSYan Zheng return 0; 198449b25e05SJeff Mahoney 198549b25e05SJeff Mahoney restore: 19861751e8a6SLinus Torvalds /* We've hit an error - don't reset SB_RDONLY */ 1987bc98a42cSDavid Howells if (sb_rdonly(sb)) 19881751e8a6SLinus Torvalds old_flags |= SB_RDONLY; 198949b25e05SJeff Mahoney sb->s_flags = old_flags; 199049b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 199149b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 199249b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 19930d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 19940d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 199549b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1996dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 199749b25e05SJeff Mahoney return ret; 1998c146afadSYan Zheng } 1999c146afadSYan Zheng 2000bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 2001bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 2002bcd53741SArne Jansen const void *dev_info2) 2003bcd53741SArne Jansen { 2004bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 2005bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 2006bcd53741SArne Jansen return -1; 2007bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 2008bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 2009bcd53741SArne Jansen return 1; 2010bcd53741SArne Jansen else 2011bcd53741SArne Jansen return 0; 2012bcd53741SArne Jansen } 2013bcd53741SArne Jansen 2014bcd53741SArne Jansen /* 2015bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 2016bcd53741SArne Jansen * is stored.(Descending Sort) 2017bcd53741SArne Jansen */ 2018bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 2019bcd53741SArne Jansen struct btrfs_device_info *devices, 2020bcd53741SArne Jansen size_t nr_devices) 2021bcd53741SArne Jansen { 2022bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 2023bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 2024bcd53741SArne Jansen } 2025bcd53741SArne Jansen 20266d07bcecSMiao Xie /* 20276d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 20286d07bcecSMiao Xie * file data. 20296d07bcecSMiao Xie */ 20306bccf3abSJeff Mahoney static int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, 20316bccf3abSJeff Mahoney u64 *free_bytes) 20326d07bcecSMiao Xie { 20336d07bcecSMiao Xie struct btrfs_device_info *devices_info; 20346d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 20356d07bcecSMiao Xie struct btrfs_device *device; 20366d07bcecSMiao Xie u64 skip_space; 20376d07bcecSMiao Xie u64 type; 20386d07bcecSMiao Xie u64 avail_space; 20396d07bcecSMiao Xie u64 min_stripe_size; 204039fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 20416d07bcecSMiao Xie int i = 0, nr_devices; 20426d07bcecSMiao Xie 20437e33fd99SJosef Bacik /* 204401327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 20457e33fd99SJosef Bacik * enough for our purposes. 20467e33fd99SJosef Bacik */ 2047b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 20487e33fd99SJosef Bacik if (!nr_devices) { 20497e33fd99SJosef Bacik smp_mb(); 20507e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 20517e33fd99SJosef Bacik ASSERT(nr_devices); 20527e33fd99SJosef Bacik if (!nr_devices) { 20537e33fd99SJosef Bacik *free_bytes = 0; 20547e33fd99SJosef Bacik return 0; 20557e33fd99SJosef Bacik } 20567e33fd99SJosef Bacik } 20576d07bcecSMiao Xie 2058d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 20596a44517dSDavid Sterba GFP_KERNEL); 20606d07bcecSMiao Xie if (!devices_info) 20616d07bcecSMiao Xie return -ENOMEM; 20626d07bcecSMiao Xie 206301327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 20641b86826dSJeff Mahoney type = btrfs_data_alloc_profile(fs_info); 206539fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 20666d07bcecSMiao Xie min_stripes = 2; 206739fb26c3SMiao Xie num_stripes = nr_devices; 206839fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 20696d07bcecSMiao Xie min_stripes = 2; 207039fb26c3SMiao Xie num_stripes = 2; 207139fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 20726d07bcecSMiao Xie min_stripes = 4; 207339fb26c3SMiao Xie num_stripes = 4; 207439fb26c3SMiao Xie } 20756d07bcecSMiao Xie 20766d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 20776d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 20786d07bcecSMiao Xie else 20796d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 20806d07bcecSMiao Xie 20817e33fd99SJosef Bacik rcu_read_lock(); 20827e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2083e12c9621SAnand Jain if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 2084e12c9621SAnand Jain &device->dev_state) || 2085401e29c1SAnand Jain !device->bdev || 2086401e29c1SAnand Jain test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) 20876d07bcecSMiao Xie continue; 20886d07bcecSMiao Xie 20897e33fd99SJosef Bacik if (i >= nr_devices) 20907e33fd99SJosef Bacik break; 20917e33fd99SJosef Bacik 20926d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 20936d07bcecSMiao Xie 20946d07bcecSMiao Xie /* align with stripe_len */ 2095f8c269d7SDavid Sterba avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); 20966d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 20976d07bcecSMiao Xie 20986d07bcecSMiao Xie /* 209901327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 21006d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 21016d07bcecSMiao Xie * allocation. 21026d07bcecSMiao Xie */ 2103ee22184bSByongho Lee skip_space = SZ_1M; 21046d07bcecSMiao Xie 21056d07bcecSMiao Xie /* 21066d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 21076d07bcecSMiao Xie * it from the total. 21086d07bcecSMiao Xie */ 21096d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 21106d07bcecSMiao Xie avail_space -= skip_space; 21116d07bcecSMiao Xie else 21126d07bcecSMiao Xie avail_space = 0; 21136d07bcecSMiao Xie 21146d07bcecSMiao Xie if (avail_space < min_stripe_size) 21156d07bcecSMiao Xie continue; 21166d07bcecSMiao Xie 21176d07bcecSMiao Xie devices_info[i].dev = device; 21186d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 21196d07bcecSMiao Xie 21206d07bcecSMiao Xie i++; 21216d07bcecSMiao Xie } 21227e33fd99SJosef Bacik rcu_read_unlock(); 21236d07bcecSMiao Xie 21246d07bcecSMiao Xie nr_devices = i; 21256d07bcecSMiao Xie 21266d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 21276d07bcecSMiao Xie 21286d07bcecSMiao Xie i = nr_devices - 1; 21296d07bcecSMiao Xie avail_space = 0; 21306d07bcecSMiao Xie while (nr_devices >= min_stripes) { 213139fb26c3SMiao Xie if (num_stripes > nr_devices) 213239fb26c3SMiao Xie num_stripes = nr_devices; 213339fb26c3SMiao Xie 21346d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 21356d07bcecSMiao Xie int j; 21366d07bcecSMiao Xie u64 alloc_size; 21376d07bcecSMiao Xie 213839fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 21396d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 214039fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 21416d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 21426d07bcecSMiao Xie } 21436d07bcecSMiao Xie i--; 21446d07bcecSMiao Xie nr_devices--; 21456d07bcecSMiao Xie } 21466d07bcecSMiao Xie 21476d07bcecSMiao Xie kfree(devices_info); 21486d07bcecSMiao Xie *free_bytes = avail_space; 21496d07bcecSMiao Xie return 0; 21506d07bcecSMiao Xie } 21516d07bcecSMiao Xie 2152ba7b6e62SDavid Sterba /* 2153ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2154ba7b6e62SDavid Sterba * 2155ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2156ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2157ba7b6e62SDavid Sterba * 2158ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 21590d0c71b3SDavid Sterba * algorithm that respects the device sizes and order of allocations. This is 21600d0c71b3SDavid Sterba * a close approximation of the actual use but there are other factors that may 21610d0c71b3SDavid Sterba * change the result (like a new metadata chunk). 2162ba7b6e62SDavid Sterba * 2163ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2164ba7b6e62SDavid Sterba */ 21658fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 21668fd17795SChris Mason { 2167815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2168815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2169815745cfSAl Viro struct list_head *head = &fs_info->space_info; 2170bd4d1088SJosef Bacik struct btrfs_space_info *found; 2171bd4d1088SJosef Bacik u64 total_used = 0; 21726d07bcecSMiao Xie u64 total_free_data = 0; 2173ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2174db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 2175815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 2176ba7b6e62SDavid Sterba unsigned factor = 1; 2177ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 21786d07bcecSMiao Xie int ret; 2179ca8a51b3SDavid Sterba u64 thresh = 0; 2180ae02d1bdSLuis de Bethencourt int mixed = 0; 21818fd17795SChris Mason 2182bd4d1088SJosef Bacik rcu_read_lock(); 218389a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 21846d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2185ba7b6e62SDavid Sterba int i; 2186ba7b6e62SDavid Sterba 21876d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 21886d07bcecSMiao Xie total_free_data -= 21896d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2190ba7b6e62SDavid Sterba 2191ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 2192ba7b6e62SDavid Sterba if (!list_empty(&found->block_groups[i])) { 2193ba7b6e62SDavid Sterba switch (i) { 2194ba7b6e62SDavid Sterba case BTRFS_RAID_DUP: 2195ba7b6e62SDavid Sterba case BTRFS_RAID_RAID1: 2196ba7b6e62SDavid Sterba case BTRFS_RAID_RAID10: 2197ba7b6e62SDavid Sterba factor = 2; 2198ba7b6e62SDavid Sterba } 2199ba7b6e62SDavid Sterba } 2200ba7b6e62SDavid Sterba } 22016d07bcecSMiao Xie } 2202ae02d1bdSLuis de Bethencourt 2203ae02d1bdSLuis de Bethencourt /* 2204ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2205ae02d1bdSLuis de Bethencourt */ 2206ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2207ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2208ae02d1bdSLuis de Bethencourt mixed = 1; 2209ae02d1bdSLuis de Bethencourt else 2210ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2211ae02d1bdSLuis de Bethencourt found->disk_used; 2212ae02d1bdSLuis de Bethencourt } 22136d07bcecSMiao Xie 2214b742bb82SYan, Zheng total_used += found->disk_used; 221589a55897SJosef Bacik } 2216ba7b6e62SDavid Sterba 2217bd4d1088SJosef Bacik rcu_read_unlock(); 2218bd4d1088SJosef Bacik 2219ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2220ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2221ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2222ba7b6e62SDavid Sterba 2223ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2224ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 222541b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 222641b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2227ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 222841b34accSLuis de Bethencourt else 222941b34accSLuis de Bethencourt buf->f_bfree = 0; 2230ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2231ba7b6e62SDavid Sterba 22320d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 22336bccf3abSJeff Mahoney ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); 22347e33fd99SJosef Bacik if (ret) 22356d07bcecSMiao Xie return ret; 2236ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 22376d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2238d397712bSChris Mason 2239ca8a51b3SDavid Sterba /* 2240ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2241ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2242ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2243ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2244ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2245ca8a51b3SDavid Sterba * 2246ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2247ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2248ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2249ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2250ca8a51b3SDavid Sterba * way around. 2251ca8a51b3SDavid Sterba */ 2252d4417e22SNikolay Borisov thresh = SZ_4M; 2253ca8a51b3SDavid Sterba 2254ae02d1bdSLuis de Bethencourt if (!mixed && total_free_meta - thresh < block_rsv->size) 2255ca8a51b3SDavid Sterba buf->f_bavail = 0; 2256ca8a51b3SDavid Sterba 2257ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2258ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2259ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2260ba7b6e62SDavid Sterba 22619d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 22629d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 22639d03632eSDavid Woodhouse on a big-endian or little-endian host */ 22649d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 22659d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 226632d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 22672b0143b5SDavid Howells buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; 22682b0143b5SDavid Howells buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; 226932d48fa1SDavid Woodhouse 22708fd17795SChris Mason return 0; 22718fd17795SChris Mason } 2272b5133862SChris Mason 2273aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2274aea52e19SAl Viro { 2275815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2276aea52e19SAl Viro kill_anon_super(sb); 2277aea52e19SAl Viro free_fs_info(fs_info); 2278aea52e19SAl Viro } 2279aea52e19SAl Viro 22802e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 22812e635a27SChris Mason .owner = THIS_MODULE, 22822e635a27SChris Mason .name = "btrfs", 2283061dbc6bSAl Viro .mount = btrfs_mount, 2284aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2285f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 22862e635a27SChris Mason }; 2287*72fa39f5SMisono, Tomohiro 2288*72fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type = { 2289*72fa39f5SMisono, Tomohiro .owner = THIS_MODULE, 2290*72fa39f5SMisono, Tomohiro .name = "btrfs", 2291*72fa39f5SMisono, Tomohiro .mount = btrfs_mount_root, 2292*72fa39f5SMisono, Tomohiro .kill_sb = btrfs_kill_super, 2293*72fa39f5SMisono, Tomohiro .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 2294*72fa39f5SMisono, Tomohiro }; 2295*72fa39f5SMisono, Tomohiro 22967f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2297a9218f6bSChris Mason 2298d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2299d8620958STom Van Braeckel { 2300d8620958STom Van Braeckel /* 2301d8620958STom Van Braeckel * The control file's private_data is used to hold the 2302d8620958STom Van Braeckel * transaction when it is started and is used to keep 2303d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2304d8620958STom Van Braeckel */ 2305d8620958STom Van Braeckel file->private_data = NULL; 2306d8620958STom Van Braeckel return 0; 2307d8620958STom Van Braeckel } 2308d8620958STom Van Braeckel 2309d352ac68SChris Mason /* 2310d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 2311d352ac68SChris Mason */ 23128a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 23138a4b83ccSChris Mason unsigned long arg) 23148a4b83ccSChris Mason { 23158a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 23168a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 2317c071fcfdSChris Mason int ret = -ENOTTY; 23188a4b83ccSChris Mason 2319e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2320e441d54dSChris Mason return -EPERM; 2321e441d54dSChris Mason 2322dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2323dae7b665SLi Zefan if (IS_ERR(vol)) 2324dae7b665SLi Zefan return PTR_ERR(vol); 2325c071fcfdSChris Mason 23268a4b83ccSChris Mason switch (cmd) { 23278a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 232897288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 23298a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 23308a4b83ccSChris Mason break; 233102db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 233202db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 233302db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 233402db0844SJosef Bacik if (ret) 233502db0844SJosef Bacik break; 233602db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 233702db0844SJosef Bacik break; 2338c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2339d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2340c5868f83SDavid Sterba break; 23418a4b83ccSChris Mason } 2342dae7b665SLi Zefan 23438a4b83ccSChris Mason kfree(vol); 2344f819d837SLinda Knippers return ret; 23458a4b83ccSChris Mason } 23468a4b83ccSChris Mason 23470176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2348ed0dab6bSYan { 2349354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 23500b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 23510b246afaSJeff Mahoney struct btrfs_root *root = fs_info->tree_root; 2352354aa0fbSMiao Xie 2353fac03c8dSDavid Sterba set_bit(BTRFS_FS_FROZEN, &fs_info->flags); 23549e7cc91aSWang Xiaoguang /* 23559e7cc91aSWang Xiaoguang * We don't need a barrier here, we'll wait for any transaction that 23569e7cc91aSWang Xiaoguang * could be in progress on other threads (and do delayed iputs that 23579e7cc91aSWang Xiaoguang * we want to avoid on a frozen filesystem), or do the commit 23589e7cc91aSWang Xiaoguang * ourselves. 23599e7cc91aSWang Xiaoguang */ 2360d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2361354aa0fbSMiao Xie if (IS_ERR(trans)) { 2362354aa0fbSMiao Xie /* no transaction, don't bother */ 2363354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 23640176260fSLinus Torvalds return 0; 2365354aa0fbSMiao Xie return PTR_ERR(trans); 2366354aa0fbSMiao Xie } 23673a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 2368ed0dab6bSYan } 2369ed0dab6bSYan 23709e7cc91aSWang Xiaoguang static int btrfs_unfreeze(struct super_block *sb) 23719e7cc91aSWang Xiaoguang { 2372fac03c8dSDavid Sterba struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2373fac03c8dSDavid Sterba 2374fac03c8dSDavid Sterba clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); 23759e7cc91aSWang Xiaoguang return 0; 23769e7cc91aSWang Xiaoguang } 23779e7cc91aSWang Xiaoguang 23789c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 23799c5085c1SJosef Bacik { 23809c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 23819c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 23829c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 23839c5085c1SJosef Bacik struct list_head *head; 23849c5085c1SJosef Bacik struct rcu_string *name; 23859c5085c1SJosef Bacik 23869c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 23879c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 23889c5085c1SJosef Bacik while (cur_devices) { 23899c5085c1SJosef Bacik head = &cur_devices->devices; 23909c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 2391e6e674bdSAnand Jain if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) 2392aa9ddcd4SJosef Bacik continue; 23930aeb8a6eSAnand Jain if (!dev->name) 23940aeb8a6eSAnand Jain continue; 23959c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 23969c5085c1SJosef Bacik first_dev = dev; 23979c5085c1SJosef Bacik } 23989c5085c1SJosef Bacik cur_devices = cur_devices->seed; 23999c5085c1SJosef Bacik } 24009c5085c1SJosef Bacik 24019c5085c1SJosef Bacik if (first_dev) { 24029c5085c1SJosef Bacik rcu_read_lock(); 24039c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 24049c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 24059c5085c1SJosef Bacik rcu_read_unlock(); 24069c5085c1SJosef Bacik } else { 24079c5085c1SJosef Bacik WARN_ON(1); 24089c5085c1SJosef Bacik } 24099c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 24109c5085c1SJosef Bacik return 0; 24119c5085c1SJosef Bacik } 24129c5085c1SJosef Bacik 2413b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 241476dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2415bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2416e20d96d6SChris Mason .put_super = btrfs_put_super, 2417d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2418a9572a15SEric Paris .show_options = btrfs_show_options, 24199c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 24204730a4bcSChris Mason .write_inode = btrfs_write_inode, 24212c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 24222c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 24238fd17795SChris Mason .statfs = btrfs_statfs, 2424c146afadSYan Zheng .remount_fs = btrfs_remount, 24250176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 24269e7cc91aSWang Xiaoguang .unfreeze_fs = btrfs_unfreeze, 2427e20d96d6SChris Mason }; 2428a9218f6bSChris Mason 2429a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2430d8620958STom Van Braeckel .open = btrfs_control_open, 2431a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 2432a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 2433a9218f6bSChris Mason .owner = THIS_MODULE, 24346038f373SArnd Bergmann .llseek = noop_llseek, 2435a9218f6bSChris Mason }; 2436a9218f6bSChris Mason 2437a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2438578454ffSKay Sievers .minor = BTRFS_MINOR, 2439a9218f6bSChris Mason .name = "btrfs-control", 2440a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2441a9218f6bSChris Mason }; 2442a9218f6bSChris Mason 2443578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2444578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2445578454ffSKay Sievers 2446f5c29bd9SLiu Bo static int __init btrfs_interface_init(void) 2447a9218f6bSChris Mason { 2448a9218f6bSChris Mason return misc_register(&btrfs_misc); 2449a9218f6bSChris Mason } 2450a9218f6bSChris Mason 2451b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 2452a9218f6bSChris Mason { 2453f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2454a9218f6bSChris Mason } 2455a9218f6bSChris Mason 2456f5c29bd9SLiu Bo static void __init btrfs_print_mod_info(void) 245785965600SDavid Sterba { 245862e85577SJeff Mahoney pr_info("Btrfs loaded, crc32c=%s" 245985965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 246085965600SDavid Sterba ", debug=on" 246185965600SDavid Sterba #endif 246279556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 246379556c3dSStefan Behrens ", assert=on" 246479556c3dSStefan Behrens #endif 246585965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 246685965600SDavid Sterba ", integrity-checker=on" 246785965600SDavid Sterba #endif 2468fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2469fb592373SJosef Bacik ", ref-verify=on" 2470fb592373SJosef Bacik #endif 24715f9e1059SJeff Mahoney "\n", 24725f9e1059SJeff Mahoney btrfs_crc32c_impl()); 247385965600SDavid Sterba } 247485965600SDavid Sterba 24752e635a27SChris Mason static int __init init_btrfs_fs(void) 24762e635a27SChris Mason { 24772c90e5d6SChris Mason int err; 247858176a96SJosef Bacik 247914a958e6SFilipe David Borba Manana err = btrfs_hash_init(); 248014a958e6SFilipe David Borba Manana if (err) 248114a958e6SFilipe David Borba Manana return err; 248214a958e6SFilipe David Borba Manana 248363541927SFilipe David Borba Manana btrfs_props_init(); 248463541927SFilipe David Borba Manana 248558176a96SJosef Bacik err = btrfs_init_sysfs(); 248658176a96SJosef Bacik if (err) 248714a958e6SFilipe David Borba Manana goto free_hash; 248858176a96SJosef Bacik 2489143bede5SJeff Mahoney btrfs_init_compress(); 2490d1310b2eSChris Mason 2491261507a0SLi Zefan err = btrfs_init_cachep(); 2492261507a0SLi Zefan if (err) 2493261507a0SLi Zefan goto free_compress; 2494261507a0SLi Zefan 2495d1310b2eSChris Mason err = extent_io_init(); 24962f4cbe64SWyatt Banks if (err) 24972f4cbe64SWyatt Banks goto free_cachep; 24982f4cbe64SWyatt Banks 2499d1310b2eSChris Mason err = extent_map_init(); 2500d1310b2eSChris Mason if (err) 2501d1310b2eSChris Mason goto free_extent_io; 2502d1310b2eSChris Mason 25036352b91dSMiao Xie err = ordered_data_init(); 25042f4cbe64SWyatt Banks if (err) 25052f4cbe64SWyatt Banks goto free_extent_map; 2506c8b97818SChris Mason 25076352b91dSMiao Xie err = btrfs_delayed_inode_init(); 25086352b91dSMiao Xie if (err) 25096352b91dSMiao Xie goto free_ordered_data; 25106352b91dSMiao Xie 25119247f317SMiao Xie err = btrfs_auto_defrag_init(); 251216cdcec7SMiao Xie if (err) 251316cdcec7SMiao Xie goto free_delayed_inode; 251416cdcec7SMiao Xie 251578a6184aSMiao Xie err = btrfs_delayed_ref_init(); 25169247f317SMiao Xie if (err) 25179247f317SMiao Xie goto free_auto_defrag; 25189247f317SMiao Xie 2519b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2520b9e9a6cbSWang Shilong if (err) 2521af13b492SDavid Sterba goto free_delayed_ref; 2522b9e9a6cbSWang Shilong 252397eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 252478a6184aSMiao Xie if (err) 2525af13b492SDavid Sterba goto free_prelim_ref; 252678a6184aSMiao Xie 252797eb6b69SDavid Sterba err = btrfs_interface_init(); 252897eb6b69SDavid Sterba if (err) 252997eb6b69SDavid Sterba goto free_end_io_wq; 253097eb6b69SDavid Sterba 2531e565d4b9SJan Schmidt btrfs_init_lockdep(); 2532e565d4b9SJan Schmidt 25338ae1af3cSAnand Jain btrfs_print_mod_info(); 2534dc11dd5dSJosef Bacik 2535dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2536dc11dd5dSJosef Bacik if (err) 2537dc11dd5dSJosef Bacik goto unregister_ioctl; 2538dc11dd5dSJosef Bacik 2539dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2540dc11dd5dSJosef Bacik if (err) 2541dc11dd5dSJosef Bacik goto unregister_ioctl; 254274255aa0SJosef Bacik 25432f4cbe64SWyatt Banks return 0; 25442f4cbe64SWyatt Banks 2545a9218f6bSChris Mason unregister_ioctl: 2546a9218f6bSChris Mason btrfs_interface_exit(); 254797eb6b69SDavid Sterba free_end_io_wq: 254897eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2549b9e9a6cbSWang Shilong free_prelim_ref: 2550b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 255178a6184aSMiao Xie free_delayed_ref: 255278a6184aSMiao Xie btrfs_delayed_ref_exit(); 25539247f317SMiao Xie free_auto_defrag: 25549247f317SMiao Xie btrfs_auto_defrag_exit(); 255516cdcec7SMiao Xie free_delayed_inode: 255616cdcec7SMiao Xie btrfs_delayed_inode_exit(); 25576352b91dSMiao Xie free_ordered_data: 25586352b91dSMiao Xie ordered_data_exit(); 25592f4cbe64SWyatt Banks free_extent_map: 25602f4cbe64SWyatt Banks extent_map_exit(); 2561d1310b2eSChris Mason free_extent_io: 2562d1310b2eSChris Mason extent_io_exit(); 25632f4cbe64SWyatt Banks free_cachep: 25642f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2565261507a0SLi Zefan free_compress: 2566261507a0SLi Zefan btrfs_exit_compress(); 25672f4cbe64SWyatt Banks btrfs_exit_sysfs(); 256814a958e6SFilipe David Borba Manana free_hash: 256914a958e6SFilipe David Borba Manana btrfs_hash_exit(); 25702c90e5d6SChris Mason return err; 25712e635a27SChris Mason } 25722e635a27SChris Mason 25732e635a27SChris Mason static void __exit exit_btrfs_fs(void) 25742e635a27SChris Mason { 257539279cc3SChris Mason btrfs_destroy_cachep(); 257678a6184aSMiao Xie btrfs_delayed_ref_exit(); 25779247f317SMiao Xie btrfs_auto_defrag_exit(); 257816cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2579b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 25806352b91dSMiao Xie ordered_data_exit(); 2581a52d9a80SChris Mason extent_map_exit(); 2582d1310b2eSChris Mason extent_io_exit(); 2583a9218f6bSChris Mason btrfs_interface_exit(); 25845ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 25852e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 258658176a96SJosef Bacik btrfs_exit_sysfs(); 25878a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2588261507a0SLi Zefan btrfs_exit_compress(); 258914a958e6SFilipe David Borba Manana btrfs_hash_exit(); 25902e635a27SChris Mason } 25912e635a27SChris Mason 259260efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 25932e635a27SChris Mason module_exit(exit_btrfs_fs) 25942e635a27SChris Mason 25952e635a27SChris Mason MODULE_LICENSE("GPL"); 2596