1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 64b82d6e4SYan #include <linux/blkdev.h> 72e635a27SChris Mason #include <linux/module.h> 82e635a27SChris Mason #include <linux/fs.h> 92e635a27SChris Mason #include <linux/pagemap.h> 102e635a27SChris Mason #include <linux/highmem.h> 112e635a27SChris Mason #include <linux/time.h> 122e635a27SChris Mason #include <linux/init.h> 13a9572a15SEric Paris #include <linux/seq_file.h> 142e635a27SChris Mason #include <linux/string.h> 152e635a27SChris Mason #include <linux/backing-dev.h> 164b82d6e4SYan #include <linux/mount.h> 1775dfe396SChris Mason #include <linux/writeback.h> 188fd17795SChris Mason #include <linux/statfs.h> 1908607c1bSChris Mason #include <linux/compat.h> 2095e05289SChris Mason #include <linux/parser.h> 21c59f8951SChris Mason #include <linux/ctype.h> 226da6abaeSChris Mason #include <linux/namei.h> 23a9218f6bSChris Mason #include <linux/miscdevice.h> 241bcbf313SQinghuang Feng #include <linux/magic.h> 255a0e3ad6STejun Heo #include <linux/slab.h> 2690a887c9SDan Magenheimer #include <linux/cleancache.h> 2722c44fe6SJosef Bacik #include <linux/ratelimit.h> 289678c543SNikolay Borisov #include <linux/crc32c.h> 2955e301fdSFilipe Brandenburger #include <linux/btrfs.h> 3016cdcec7SMiao Xie #include "delayed-inode.h" 312e635a27SChris Mason #include "ctree.h" 32e20d96d6SChris Mason #include "disk-io.h" 33d5719762SChris Mason #include "transaction.h" 342c90e5d6SChris Mason #include "btrfs_inode.h" 353a686375SChris Mason #include "print-tree.h" 3663541927SFilipe David Borba Manana #include "props.h" 375103e947SJosef Bacik #include "xattr.h" 388a4b83ccSChris Mason #include "volumes.h" 39be6e8dc0SBalaji Rao #include "export.h" 40c8b97818SChris Mason #include "compression.h" 419c5085c1SJosef Bacik #include "rcu-string.h" 428dabb742SStefan Behrens #include "dev-replace.h" 4374255aa0SJosef Bacik #include "free-space-cache.h" 44b9e9a6cbSWang Shilong #include "backref.h" 458719aaaeSJosef Bacik #include "space-info.h" 4689439109SDavid Sterba #include "sysfs.h" 47b70f5097SNaohiro Aota #include "zoned.h" 48dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 49aac0023cSJosef Bacik #include "block-group.h" 50b0643e59SDennis Zhou #include "discard.h" 512e635a27SChris Mason 52d3982100SMark Fasheh #include "qgroup.h" 531abe9b8aSliubo #define CREATE_TRACE_POINTS 541abe9b8aSliubo #include <trace/events/btrfs.h> 551abe9b8aSliubo 56b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 5772fa39f5SMisono, Tomohiro 5872fa39f5SMisono, Tomohiro /* 5972fa39f5SMisono, Tomohiro * Types for mounting the default subvolume and a subvolume explicitly 6072fa39f5SMisono, Tomohiro * requested by subvol=/path. That way the callchain is straightforward and we 6172fa39f5SMisono, Tomohiro * don't have to play tricks with the mount options and recursive calls to 6272fa39f5SMisono, Tomohiro * btrfs_mount. 63312c89fbSMisono, Tomohiro * 64312c89fbSMisono, Tomohiro * The new btrfs_root_fs_type also servers as a tag for the bdev_holder. 6572fa39f5SMisono, Tomohiro */ 66830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 6772fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type; 68e20d96d6SChris Mason 690723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 700723a047SHarald Hoyer 7159131393SJosef Bacik /* 7259131393SJosef Bacik * Generally the error codes correspond to their respective errors, but there 7359131393SJosef Bacik * are a few special cases. 7459131393SJosef Bacik * 7559131393SJosef Bacik * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for 7659131393SJosef Bacik * instance will return EUCLEAN if any of the blocks are corrupted in 7759131393SJosef Bacik * a way that is problematic. We want to reserve EUCLEAN for these 7859131393SJosef Bacik * sort of corruptions. 7959131393SJosef Bacik * 8059131393SJosef Bacik * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we 8159131393SJosef Bacik * need to use EROFS for this case. We will have no idea of the 8259131393SJosef Bacik * original failure, that will have been reported at the time we tripped 8359131393SJosef Bacik * over the error. Each subsequent error that doesn't have any context 8459131393SJosef Bacik * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR. 8559131393SJosef Bacik */ 864143cb8bSDavid Sterba const char * __attribute_const__ btrfs_decode_error(int errno) 87acce952bSliubo { 8808748810SDavid Sterba char *errstr = "unknown"; 89acce952bSliubo 90acce952bSliubo switch (errno) { 91d54f8144SDavid Sterba case -ENOENT: /* -2 */ 92d54f8144SDavid Sterba errstr = "No such entry"; 93d54f8144SDavid Sterba break; 94d54f8144SDavid Sterba case -EIO: /* -5 */ 95acce952bSliubo errstr = "IO failure"; 96acce952bSliubo break; 97d54f8144SDavid Sterba case -ENOMEM: /* -12*/ 98acce952bSliubo errstr = "Out of memory"; 99acce952bSliubo break; 100d54f8144SDavid Sterba case -EEXIST: /* -17 */ 1018c342930SJeff Mahoney errstr = "Object already exists"; 1028c342930SJeff Mahoney break; 103d54f8144SDavid Sterba case -ENOSPC: /* -28 */ 10494ef7280SDavid Sterba errstr = "No space left"; 10594ef7280SDavid Sterba break; 106d54f8144SDavid Sterba case -EROFS: /* -30 */ 107d54f8144SDavid Sterba errstr = "Readonly filesystem"; 10894ef7280SDavid Sterba break; 109fb8521caSDavid Sterba case -EOPNOTSUPP: /* -95 */ 110fb8521caSDavid Sterba errstr = "Operation not supported"; 111fb8521caSDavid Sterba break; 112fb8521caSDavid Sterba case -EUCLEAN: /* -117 */ 113fb8521caSDavid Sterba errstr = "Filesystem corrupted"; 114fb8521caSDavid Sterba break; 115fb8521caSDavid Sterba case -EDQUOT: /* -122 */ 116fb8521caSDavid Sterba errstr = "Quota exceeded"; 117fb8521caSDavid Sterba break; 118acce952bSliubo } 119acce952bSliubo 120acce952bSliubo return errstr; 121acce952bSliubo } 122acce952bSliubo 123acce952bSliubo /* 12434d97007SAnand Jain * __btrfs_handle_fs_error decodes expected errors from the caller and 12552042d8eSAndrea Gelmini * invokes the appropriate error response. 126acce952bSliubo */ 127c0d19e2bSDavid Sterba __cold 12834d97007SAnand Jain void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 1294da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 130acce952bSliubo { 131acce952bSliubo struct super_block *sb = fs_info->sb; 13257d816a1SAnand Jain #ifdef CONFIG_PRINTK 133acce952bSliubo const char *errstr; 13457d816a1SAnand Jain #endif 135acce952bSliubo 136acce952bSliubo /* 137acce952bSliubo * Special case: if the error is EROFS, and we're already 1381751e8a6SLinus Torvalds * under SB_RDONLY, then it is safe here. 139acce952bSliubo */ 140bc98a42cSDavid Howells if (errno == -EROFS && sb_rdonly(sb)) 141acce952bSliubo return; 142acce952bSliubo 14357d816a1SAnand Jain #ifdef CONFIG_PRINTK 14408748810SDavid Sterba errstr = btrfs_decode_error(errno); 1454da35113SJeff Mahoney if (fmt) { 14637252a66SEric Sandeen struct va_format vaf; 14737252a66SEric Sandeen va_list args; 14837252a66SEric Sandeen 14937252a66SEric Sandeen va_start(args, fmt); 15037252a66SEric Sandeen vaf.fmt = fmt; 15137252a66SEric Sandeen vaf.va = &args; 1524da35113SJeff Mahoney 15362e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 15408748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 15537252a66SEric Sandeen va_end(args); 1564da35113SJeff Mahoney } else { 15762e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 15808748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1594da35113SJeff Mahoney } 16057d816a1SAnand Jain #endif 161acce952bSliubo 1620713d90cSAnand Jain /* 1630713d90cSAnand Jain * Today we only save the error info to memory. Long term we'll 1640713d90cSAnand Jain * also send it down to the disk 1650713d90cSAnand Jain */ 1660713d90cSAnand Jain set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 1670713d90cSAnand Jain 1684da35113SJeff Mahoney /* Don't go through full error handling during mount */ 169922ea899SAnand Jain if (!(sb->s_flags & SB_BORN)) 170922ea899SAnand Jain return; 171922ea899SAnand Jain 172922ea899SAnand Jain if (sb_rdonly(sb)) 173922ea899SAnand Jain return; 174922ea899SAnand Jain 175b0643e59SDennis Zhou btrfs_discard_stop(fs_info); 176b0643e59SDennis Zhou 177922ea899SAnand Jain /* btrfs handle error by forcing the filesystem readonly */ 178922ea899SAnand Jain sb->s_flags |= SB_RDONLY; 179922ea899SAnand Jain btrfs_info(fs_info, "forced readonly"); 180922ea899SAnand Jain /* 181922ea899SAnand Jain * Note that a running device replace operation is not canceled here 182922ea899SAnand Jain * although there is no way to update the progress. It would add the 183922ea899SAnand Jain * risk of a deadlock, therefore the canceling is omitted. The only 184922ea899SAnand Jain * penalty is that some I/O remains active until the procedure 18552042d8eSAndrea Gelmini * completes. The next time when the filesystem is mounted writable 186922ea899SAnand Jain * again, the device replace operation continues. 187922ea899SAnand Jain */ 188acce952bSliubo } 1894da35113SJeff Mahoney 19057d816a1SAnand Jain #ifdef CONFIG_PRINTK 191533574c6SJoe Perches static const char * const logtypes[] = { 1924da35113SJeff Mahoney "emergency", 1934da35113SJeff Mahoney "alert", 1944da35113SJeff Mahoney "critical", 1954da35113SJeff Mahoney "error", 1964da35113SJeff Mahoney "warning", 1974da35113SJeff Mahoney "notice", 1984da35113SJeff Mahoney "info", 1994da35113SJeff Mahoney "debug", 2004da35113SJeff Mahoney }; 2014da35113SJeff Mahoney 20235f4e5e6SNikolay Borisov 20335f4e5e6SNikolay Borisov /* 20435f4e5e6SNikolay Borisov * Use one ratelimit state per log level so that a flood of less important 20535f4e5e6SNikolay Borisov * messages doesn't cause more important ones to be dropped. 20635f4e5e6SNikolay Borisov */ 20735f4e5e6SNikolay Borisov static struct ratelimit_state printk_limits[] = { 20835f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), 20935f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), 21035f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), 21135f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), 21235f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), 21335f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), 21435f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), 21535f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), 21635f4e5e6SNikolay Borisov }; 21735f4e5e6SNikolay Borisov 218b105e927SDavid Sterba void __cold btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 2194da35113SJeff Mahoney { 22040f7828bSPetr Mladek char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; 2214da35113SJeff Mahoney struct va_format vaf; 2224da35113SJeff Mahoney va_list args; 223533574c6SJoe Perches int kern_level; 22440f7828bSPetr Mladek const char *type = logtypes[4]; 22540f7828bSPetr Mladek struct ratelimit_state *ratelimit = &printk_limits[4]; 2264da35113SJeff Mahoney 2274da35113SJeff Mahoney va_start(args, fmt); 2284da35113SJeff Mahoney 229262c5e86SPetr Mladek while ((kern_level = printk_get_level(fmt)) != 0) { 230533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 231262c5e86SPetr Mladek 232262c5e86SPetr Mladek if (kern_level >= '0' && kern_level <= '7') { 233533574c6SJoe Perches memcpy(lvl, fmt, size); 234533574c6SJoe Perches lvl[size] = '\0'; 235533574c6SJoe Perches type = logtypes[kern_level - '0']; 23635f4e5e6SNikolay Borisov ratelimit = &printk_limits[kern_level - '0']; 237262c5e86SPetr Mladek } 238262c5e86SPetr Mladek fmt += size; 239262c5e86SPetr Mladek } 240262c5e86SPetr Mladek 2414da35113SJeff Mahoney vaf.fmt = fmt; 2424da35113SJeff Mahoney vaf.va = &args; 243533574c6SJoe Perches 244a0f6d924SDavid Sterba if (__ratelimit(ratelimit)) { 245a0f6d924SDavid Sterba if (fs_info) 2463993b112SColin Ian King printk("%sBTRFS %s (device %s): %pV\n", lvl, type, 247a0f6d924SDavid Sterba fs_info->sb->s_id, &vaf); 248a0f6d924SDavid Sterba else 249a0f6d924SDavid Sterba printk("%sBTRFS %s: %pV\n", lvl, type, &vaf); 250a0f6d924SDavid Sterba } 251533574c6SJoe Perches 252533574c6SJoe Perches va_end(args); 2534da35113SJeff Mahoney } 254533574c6SJoe Perches #endif 255533574c6SJoe Perches 2568c342930SJeff Mahoney /* 25749b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 25849b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 25949b25e05SJeff Mahoney * one. 26049b25e05SJeff Mahoney * 26149b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 26249b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 26349b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 26449b25e05SJeff Mahoney * in the call path but will return -EIO. 26549b25e05SJeff Mahoney * 26649b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 26749b25e05SJeff Mahoney * btrfs_commit_transaction. 26849b25e05SJeff Mahoney */ 269c0d19e2bSDavid Sterba __cold 27049b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 27166642832SJeff Mahoney const char *function, 27249b25e05SJeff Mahoney unsigned int line, int errno) 27349b25e05SJeff Mahoney { 27466642832SJeff Mahoney struct btrfs_fs_info *fs_info = trans->fs_info; 27566642832SJeff Mahoney 276bf31f87fSDavid Sterba WRITE_ONCE(trans->aborted, errno); 27749b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 27849b25e05SJeff Mahoney * transaction may be able to continue. */ 27964c12921SJeff Mahoney if (!trans->dirty && list_empty(&trans->new_bgs)) { 28069ce977aSMiao Xie const char *errstr; 28169ce977aSMiao Xie 28208748810SDavid Sterba errstr = btrfs_decode_error(errno); 28366642832SJeff Mahoney btrfs_warn(fs_info, 284c2cf52ebSSimon Kirby "%s:%d: Aborting unused transaction(%s).", 28569ce977aSMiao Xie function, line, errstr); 28649b25e05SJeff Mahoney return; 28749b25e05SJeff Mahoney } 28820c7bcecSSeraphime Kirkovski WRITE_ONCE(trans->transaction->aborted, errno); 289501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 29066642832SJeff Mahoney wake_up(&fs_info->transaction_wait); 29166642832SJeff Mahoney wake_up(&fs_info->transaction_blocked_wait); 29266642832SJeff Mahoney __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); 29349b25e05SJeff Mahoney } 29449b25e05SJeff Mahoney /* 2958c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2968c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2978c342930SJeff Mahoney */ 298c0d19e2bSDavid Sterba __cold 2998c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3008c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 3018c342930SJeff Mahoney { 3028c342930SJeff Mahoney char *s_id = "<unknown>"; 3038c342930SJeff Mahoney const char *errstr; 3048c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 3058c342930SJeff Mahoney va_list args; 3068c342930SJeff Mahoney 3078c342930SJeff Mahoney if (fs_info) 3088c342930SJeff Mahoney s_id = fs_info->sb->s_id; 3098c342930SJeff Mahoney 3108c342930SJeff Mahoney va_start(args, fmt); 3118c342930SJeff Mahoney vaf.va = &args; 3128c342930SJeff Mahoney 31308748810SDavid Sterba errstr = btrfs_decode_error(errno); 314d8953d69SSatoru Takeuchi if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) 31508748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 31608748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 3178c342930SJeff Mahoney 318efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 319efe120a0SFrank Holton function, line, &vaf, errno, errstr); 3208c342930SJeff Mahoney va_end(args); 3218c342930SJeff Mahoney /* Caller calls BUG() */ 3228c342930SJeff Mahoney } 323acce952bSliubo 324e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 325e20d96d6SChris Mason { 3266bccf3abSJeff Mahoney close_ctree(btrfs_sb(sb)); 327e20d96d6SChris Mason } 3282e635a27SChris Mason 32995e05289SChris Mason enum { 330416a7202SDavid Sterba Opt_acl, Opt_noacl, 331416a7202SDavid Sterba Opt_clear_cache, 332416a7202SDavid Sterba Opt_commit_interval, 333416a7202SDavid Sterba Opt_compress, 334416a7202SDavid Sterba Opt_compress_force, 335416a7202SDavid Sterba Opt_compress_force_type, 336416a7202SDavid Sterba Opt_compress_type, 337416a7202SDavid Sterba Opt_degraded, 338416a7202SDavid Sterba Opt_device, 339416a7202SDavid Sterba Opt_fatal_errors, 340416a7202SDavid Sterba Opt_flushoncommit, Opt_noflushoncommit, 341416a7202SDavid Sterba Opt_max_inline, 342416a7202SDavid Sterba Opt_barrier, Opt_nobarrier, 343416a7202SDavid Sterba Opt_datacow, Opt_nodatacow, 344416a7202SDavid Sterba Opt_datasum, Opt_nodatasum, 345416a7202SDavid Sterba Opt_defrag, Opt_nodefrag, 346416a7202SDavid Sterba Opt_discard, Opt_nodiscard, 347b0643e59SDennis Zhou Opt_discard_mode, 348416a7202SDavid Sterba Opt_norecovery, 349416a7202SDavid Sterba Opt_ratio, 350416a7202SDavid Sterba Opt_rescan_uuid_tree, 351416a7202SDavid Sterba Opt_skip_balance, 352416a7202SDavid Sterba Opt_space_cache, Opt_no_space_cache, 353416a7202SDavid Sterba Opt_space_cache_version, 354416a7202SDavid Sterba Opt_ssd, Opt_nossd, 355416a7202SDavid Sterba Opt_ssd_spread, Opt_nossd_spread, 356416a7202SDavid Sterba Opt_subvol, 35737becec9SOmar Sandoval Opt_subvol_empty, 358416a7202SDavid Sterba Opt_subvolid, 359416a7202SDavid Sterba Opt_thread_pool, 360416a7202SDavid Sterba Opt_treelog, Opt_notreelog, 361416a7202SDavid Sterba Opt_user_subvol_rm_allowed, 362416a7202SDavid Sterba 36374ef0018SQu Wenruo /* Rescue options */ 36474ef0018SQu Wenruo Opt_rescue, 36574ef0018SQu Wenruo Opt_usebackuproot, 36674ef0018SQu Wenruo Opt_nologreplay, 36742437a63SJosef Bacik Opt_ignorebadroots, 368882dbe0cSJosef Bacik Opt_ignoredatacsums, 3699037d3cbSJosef Bacik Opt_rescue_all, 37074ef0018SQu Wenruo 371416a7202SDavid Sterba /* Deprecated options */ 372416a7202SDavid Sterba Opt_recovery, 3735297199aSNikolay Borisov Opt_inode_cache, Opt_noinode_cache, 374416a7202SDavid Sterba 375416a7202SDavid Sterba /* Debugging options */ 376416a7202SDavid Sterba Opt_check_integrity, 37770f6d82eSOmar Sandoval Opt_check_integrity_including_extent_data, 378416a7202SDavid Sterba Opt_check_integrity_print_mask, 379416a7202SDavid Sterba Opt_enospc_debug, Opt_noenospc_debug, 380d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 381d0bd4560SJosef Bacik Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, 382d0bd4560SJosef Bacik #endif 383fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 384fb592373SJosef Bacik Opt_ref_verify, 385fb592373SJosef Bacik #endif 3869555c6c1SIlya Dryomov Opt_err, 38795e05289SChris Mason }; 38895e05289SChris Mason 3894d4ab6d6SDavid Sterba static const match_table_t tokens = { 390416a7202SDavid Sterba {Opt_acl, "acl"}, 391416a7202SDavid Sterba {Opt_noacl, "noacl"}, 392416a7202SDavid Sterba {Opt_clear_cache, "clear_cache"}, 393416a7202SDavid Sterba {Opt_commit_interval, "commit=%u"}, 394c8b97818SChris Mason {Opt_compress, "compress"}, 395261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 396a555f810SChris Mason {Opt_compress_force, "compress-force"}, 397261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 398416a7202SDavid Sterba {Opt_degraded, "degraded"}, 399416a7202SDavid Sterba {Opt_device, "device=%s"}, 400416a7202SDavid Sterba {Opt_fatal_errors, "fatal_errors=%s"}, 401dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 4022c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 4034b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 4043818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 405416a7202SDavid Sterba {Opt_max_inline, "max_inline=%s"}, 406416a7202SDavid Sterba {Opt_barrier, "barrier"}, 407416a7202SDavid Sterba {Opt_nobarrier, "nobarrier"}, 408416a7202SDavid Sterba {Opt_datacow, "datacow"}, 409416a7202SDavid Sterba {Opt_nodatacow, "nodatacow"}, 410416a7202SDavid Sterba {Opt_datasum, "datasum"}, 411416a7202SDavid Sterba {Opt_nodatasum, "nodatasum"}, 412416a7202SDavid Sterba {Opt_defrag, "autodefrag"}, 413416a7202SDavid Sterba {Opt_nodefrag, "noautodefrag"}, 414416a7202SDavid Sterba {Opt_discard, "discard"}, 415b0643e59SDennis Zhou {Opt_discard_mode, "discard=%s"}, 416416a7202SDavid Sterba {Opt_nodiscard, "nodiscard"}, 417416a7202SDavid Sterba {Opt_norecovery, "norecovery"}, 418416a7202SDavid Sterba {Opt_ratio, "metadata_ratio=%u"}, 419416a7202SDavid Sterba {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 4209555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 421416a7202SDavid Sterba {Opt_space_cache, "space_cache"}, 422416a7202SDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 423416a7202SDavid Sterba {Opt_space_cache_version, "space_cache=%s"}, 424416a7202SDavid Sterba {Opt_ssd, "ssd"}, 425416a7202SDavid Sterba {Opt_nossd, "nossd"}, 426416a7202SDavid Sterba {Opt_ssd_spread, "ssd_spread"}, 427416a7202SDavid Sterba {Opt_nossd_spread, "nossd_spread"}, 428416a7202SDavid Sterba {Opt_subvol, "subvol=%s"}, 42937becec9SOmar Sandoval {Opt_subvol_empty, "subvol="}, 430416a7202SDavid Sterba {Opt_subvolid, "subvolid=%s"}, 431416a7202SDavid Sterba {Opt_thread_pool, "thread_pool=%u"}, 432416a7202SDavid Sterba {Opt_treelog, "treelog"}, 433416a7202SDavid Sterba {Opt_notreelog, "notreelog"}, 434416a7202SDavid Sterba {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 435416a7202SDavid Sterba 43674ef0018SQu Wenruo /* Rescue options */ 43774ef0018SQu Wenruo {Opt_rescue, "rescue=%s"}, 43874ef0018SQu Wenruo /* Deprecated, with alias rescue=nologreplay */ 43974ef0018SQu Wenruo {Opt_nologreplay, "nologreplay"}, 44074ef0018SQu Wenruo /* Deprecated, with alias rescue=usebackuproot */ 44174ef0018SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 44274ef0018SQu Wenruo 443416a7202SDavid Sterba /* Deprecated options */ 444416a7202SDavid Sterba {Opt_recovery, "recovery"}, 445416a7202SDavid Sterba 446416a7202SDavid Sterba /* Debugging options */ 44721adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 44821adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 44902453bdeSAnand Jain {Opt_check_integrity_print_mask, "check_int_print_mask=%u"}, 450416a7202SDavid Sterba {Opt_enospc_debug, "enospc_debug"}, 451416a7202SDavid Sterba {Opt_noenospc_debug, "noenospc_debug"}, 452d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 453d0bd4560SJosef Bacik {Opt_fragment_data, "fragment=data"}, 454d0bd4560SJosef Bacik {Opt_fragment_metadata, "fragment=metadata"}, 455d0bd4560SJosef Bacik {Opt_fragment_all, "fragment=all"}, 456d0bd4560SJosef Bacik #endif 457fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 458fb592373SJosef Bacik {Opt_ref_verify, "ref_verify"}, 459fb592373SJosef Bacik #endif 46033268eafSJosef Bacik {Opt_err, NULL}, 46195e05289SChris Mason }; 46295e05289SChris Mason 46374ef0018SQu Wenruo static const match_table_t rescue_tokens = { 46474ef0018SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 46574ef0018SQu Wenruo {Opt_nologreplay, "nologreplay"}, 46642437a63SJosef Bacik {Opt_ignorebadroots, "ignorebadroots"}, 46742437a63SJosef Bacik {Opt_ignorebadroots, "ibadroots"}, 468882dbe0cSJosef Bacik {Opt_ignoredatacsums, "ignoredatacsums"}, 469882dbe0cSJosef Bacik {Opt_ignoredatacsums, "idatacsums"}, 4709037d3cbSJosef Bacik {Opt_rescue_all, "all"}, 47174ef0018SQu Wenruo {Opt_err, NULL}, 47274ef0018SQu Wenruo }; 47374ef0018SQu Wenruo 474d70bf748SJosef Bacik static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt, 475d70bf748SJosef Bacik const char *opt_name) 476d70bf748SJosef Bacik { 477d70bf748SJosef Bacik if (fs_info->mount_opt & opt) { 478d70bf748SJosef Bacik btrfs_err(fs_info, "%s must be used with ro mount option", 479d70bf748SJosef Bacik opt_name); 480d70bf748SJosef Bacik return true; 481d70bf748SJosef Bacik } 482d70bf748SJosef Bacik return false; 483d70bf748SJosef Bacik } 484d70bf748SJosef Bacik 48574ef0018SQu Wenruo static int parse_rescue_options(struct btrfs_fs_info *info, const char *options) 48674ef0018SQu Wenruo { 48774ef0018SQu Wenruo char *opts; 48874ef0018SQu Wenruo char *orig; 48974ef0018SQu Wenruo char *p; 49074ef0018SQu Wenruo substring_t args[MAX_OPT_ARGS]; 49174ef0018SQu Wenruo int ret = 0; 49274ef0018SQu Wenruo 49374ef0018SQu Wenruo opts = kstrdup(options, GFP_KERNEL); 49474ef0018SQu Wenruo if (!opts) 49574ef0018SQu Wenruo return -ENOMEM; 49674ef0018SQu Wenruo orig = opts; 49774ef0018SQu Wenruo 49874ef0018SQu Wenruo while ((p = strsep(&opts, ":")) != NULL) { 49974ef0018SQu Wenruo int token; 50074ef0018SQu Wenruo 50174ef0018SQu Wenruo if (!*p) 50274ef0018SQu Wenruo continue; 50374ef0018SQu Wenruo token = match_token(p, rescue_tokens, args); 50474ef0018SQu Wenruo switch (token){ 50574ef0018SQu Wenruo case Opt_usebackuproot: 50674ef0018SQu Wenruo btrfs_info(info, 50774ef0018SQu Wenruo "trying to use backup root at mount time"); 50874ef0018SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 50974ef0018SQu Wenruo break; 51074ef0018SQu Wenruo case Opt_nologreplay: 51174ef0018SQu Wenruo btrfs_set_and_info(info, NOLOGREPLAY, 51274ef0018SQu Wenruo "disabling log replay at mount time"); 51374ef0018SQu Wenruo break; 51442437a63SJosef Bacik case Opt_ignorebadroots: 51542437a63SJosef Bacik btrfs_set_and_info(info, IGNOREBADROOTS, 51642437a63SJosef Bacik "ignoring bad roots"); 51742437a63SJosef Bacik break; 518882dbe0cSJosef Bacik case Opt_ignoredatacsums: 519882dbe0cSJosef Bacik btrfs_set_and_info(info, IGNOREDATACSUMS, 520882dbe0cSJosef Bacik "ignoring data csums"); 521882dbe0cSJosef Bacik break; 5229037d3cbSJosef Bacik case Opt_rescue_all: 5239037d3cbSJosef Bacik btrfs_info(info, "enabling all of the rescue options"); 5249037d3cbSJosef Bacik btrfs_set_and_info(info, IGNOREDATACSUMS, 5259037d3cbSJosef Bacik "ignoring data csums"); 5269037d3cbSJosef Bacik btrfs_set_and_info(info, IGNOREBADROOTS, 5279037d3cbSJosef Bacik "ignoring bad roots"); 5289037d3cbSJosef Bacik btrfs_set_and_info(info, NOLOGREPLAY, 5299037d3cbSJosef Bacik "disabling log replay at mount time"); 5309037d3cbSJosef Bacik break; 53174ef0018SQu Wenruo case Opt_err: 53274ef0018SQu Wenruo btrfs_info(info, "unrecognized rescue option '%s'", p); 53374ef0018SQu Wenruo ret = -EINVAL; 53474ef0018SQu Wenruo goto out; 53574ef0018SQu Wenruo default: 53674ef0018SQu Wenruo break; 53774ef0018SQu Wenruo } 53874ef0018SQu Wenruo 53974ef0018SQu Wenruo } 54074ef0018SQu Wenruo out: 54174ef0018SQu Wenruo kfree(orig); 54274ef0018SQu Wenruo return ret; 54374ef0018SQu Wenruo } 54474ef0018SQu Wenruo 545edf24abeSChristoph Hellwig /* 546edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 547edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 54849b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 549edf24abeSChristoph Hellwig */ 5502ff7e61eSJeff Mahoney int btrfs_parse_options(struct btrfs_fs_info *info, char *options, 55196da0919SQu Wenruo unsigned long new_flags) 55295e05289SChris Mason { 55395e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 554e215772cSMisono, Tomohiro char *p, *num; 55573bc1876SJosef Bacik u64 cache_gen; 5564543df7eSChris Mason int intarg; 557a7a3f7caSSage Weil int ret = 0; 558261507a0SLi Zefan char *compress_type; 559261507a0SLi Zefan bool compress_force = false; 560b7c47bbbSTsutomu Itoh enum btrfs_compression_type saved_compress_type; 56127942c99SDavid Sterba int saved_compress_level; 562b7c47bbbSTsutomu Itoh bool saved_compress_force; 563b7c47bbbSTsutomu Itoh int no_compress = 0; 564b6cda9bcSChris Mason 5650b246afaSJeff Mahoney cache_gen = btrfs_super_cache_generation(info->super_copy); 5660b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) 56770f6d82eSOmar Sandoval btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); 5685d1ab66cSNaohiro Aota else if (cache_gen) { 5695d1ab66cSNaohiro Aota if (btrfs_is_zoned(info)) { 5705d1ab66cSNaohiro Aota btrfs_info(info, 5715d1ab66cSNaohiro Aota "zoned: clearing existing space cache"); 5725d1ab66cSNaohiro Aota btrfs_set_super_cache_generation(info->super_copy, 0); 5735d1ab66cSNaohiro Aota } else { 57473bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 5755d1ab66cSNaohiro Aota } 5765d1ab66cSNaohiro Aota } 57773bc1876SJosef Bacik 57896da0919SQu Wenruo /* 57996da0919SQu Wenruo * Even the options are empty, we still need to do extra check 58096da0919SQu Wenruo * against new flags 58196da0919SQu Wenruo */ 58295e05289SChris Mason if (!options) 58396da0919SQu Wenruo goto check; 58495e05289SChris Mason 58595e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 58695e05289SChris Mason int token; 58795e05289SChris Mason if (!*p) 58895e05289SChris Mason continue; 58995e05289SChris Mason 59095e05289SChris Mason token = match_token(p, tokens, args); 59195e05289SChris Mason switch (token) { 592dfe25020SChris Mason case Opt_degraded: 5930b246afaSJeff Mahoney btrfs_info(info, "allowing degraded mounts"); 594dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 595dfe25020SChris Mason break; 59695e05289SChris Mason case Opt_subvol: 59737becec9SOmar Sandoval case Opt_subvol_empty: 59873f73415SJosef Bacik case Opt_subvolid: 59943e570b0SChristoph Hellwig case Opt_device: 600edf24abeSChristoph Hellwig /* 601fa59f27cSAnand Jain * These are parsed by btrfs_parse_subvol_options or 602fa59f27cSAnand Jain * btrfs_parse_device_options and can be ignored here. 603edf24abeSChristoph Hellwig */ 60495e05289SChris Mason break; 605b6cda9bcSChris Mason case Opt_nodatasum: 6063cdde224SJeff Mahoney btrfs_set_and_info(info, NODATASUM, 60707802534SQu Wenruo "setting nodatasum"); 608be20aa9dSChris Mason break; 609d399167dSQu Wenruo case Opt_datasum: 6103cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) { 6113cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 6120b246afaSJeff Mahoney btrfs_info(info, 6135d163e0eSJeff Mahoney "setting datasum, datacow enabled"); 614d399167dSQu Wenruo else 6150b246afaSJeff Mahoney btrfs_info(info, "setting datasum"); 61607802534SQu Wenruo } 617d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 618d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 619d399167dSQu Wenruo break; 620be20aa9dSChris Mason case Opt_nodatacow: 6213cdde224SJeff Mahoney if (!btrfs_test_opt(info, NODATACOW)) { 6223cdde224SJeff Mahoney if (!btrfs_test_opt(info, COMPRESS) || 6233cdde224SJeff Mahoney !btrfs_test_opt(info, FORCE_COMPRESS)) { 6240b246afaSJeff Mahoney btrfs_info(info, 625efe120a0SFrank Holton "setting nodatacow, compression disabled"); 626bedb2ccaSAndrei Popa } else { 6270b246afaSJeff Mahoney btrfs_info(info, "setting nodatacow"); 628bedb2ccaSAndrei Popa } 62907802534SQu Wenruo } 630bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 631bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 632be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 633be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 634b6cda9bcSChris Mason break; 635a258af7aSQu Wenruo case Opt_datacow: 6363cdde224SJeff Mahoney btrfs_clear_and_info(info, NODATACOW, 63707802534SQu Wenruo "setting datacow"); 638a258af7aSQu Wenruo break; 639a555f810SChris Mason case Opt_compress_force: 640261507a0SLi Zefan case Opt_compress_force_type: 641261507a0SLi Zefan compress_force = true; 642c730ae0cSMarcos Paulo de Souza fallthrough; 643261507a0SLi Zefan case Opt_compress: 644261507a0SLi Zefan case Opt_compress_type: 6453cdde224SJeff Mahoney saved_compress_type = btrfs_test_opt(info, 6463cdde224SJeff Mahoney COMPRESS) ? 647b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 648b7c47bbbSTsutomu Itoh saved_compress_force = 6493cdde224SJeff Mahoney btrfs_test_opt(info, FORCE_COMPRESS); 65027942c99SDavid Sterba saved_compress_level = info->compress_level; 651261507a0SLi Zefan if (token == Opt_compress || 652261507a0SLi Zefan token == Opt_compress_force || 653a7164fa4SDavid Sterba strncmp(args[0].from, "zlib", 4) == 0) { 654261507a0SLi Zefan compress_type = "zlib"; 655eae8d825SQu Wenruo 656261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 657eae8d825SQu Wenruo info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; 658eae8d825SQu Wenruo /* 659eae8d825SQu Wenruo * args[0] contains uninitialized data since 660eae8d825SQu Wenruo * for these tokens we don't expect any 661eae8d825SQu Wenruo * parameter. 662eae8d825SQu Wenruo */ 663eae8d825SQu Wenruo if (token != Opt_compress && 664eae8d825SQu Wenruo token != Opt_compress_force) 665f51d2b59SDavid Sterba info->compress_level = 666d0ab62ceSDennis Zhou btrfs_compress_str2level( 667d0ab62ceSDennis Zhou BTRFS_COMPRESS_ZLIB, 668d0ab62ceSDennis Zhou args[0].from + 4); 669063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 670bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 671bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 672b7c47bbbSTsutomu Itoh no_compress = 0; 673a7164fa4SDavid Sterba } else if (strncmp(args[0].from, "lzo", 3) == 0) { 674a6fa6faeSLi Zefan compress_type = "lzo"; 675a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 676282dd7d7SMarcos Paulo de Souza info->compress_level = 0; 677063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 678bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 679bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 6802b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 681b7c47bbbSTsutomu Itoh no_compress = 0; 6823f93aef5SDennis Zhou } else if (strncmp(args[0].from, "zstd", 4) == 0) { 6835c1aab1dSNick Terrell compress_type = "zstd"; 6845c1aab1dSNick Terrell info->compress_type = BTRFS_COMPRESS_ZSTD; 6853f93aef5SDennis Zhou info->compress_level = 6863f93aef5SDennis Zhou btrfs_compress_str2level( 6873f93aef5SDennis Zhou BTRFS_COMPRESS_ZSTD, 6883f93aef5SDennis Zhou args[0].from + 4); 6895c1aab1dSNick Terrell btrfs_set_opt(info->mount_opt, COMPRESS); 6905c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATACOW); 6915c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATASUM); 6925c1aab1dSNick Terrell btrfs_set_fs_incompat(info, COMPRESS_ZSTD); 6935c1aab1dSNick Terrell no_compress = 0; 694063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 695063849eaSArnd Hannemann compress_type = "no"; 69627942c99SDavid Sterba info->compress_level = 0; 69727942c99SDavid Sterba info->compress_type = 0; 698063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 699063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 700063849eaSArnd Hannemann compress_force = false; 701b7c47bbbSTsutomu Itoh no_compress++; 702261507a0SLi Zefan } else { 703261507a0SLi Zefan ret = -EINVAL; 704261507a0SLi Zefan goto out; 705261507a0SLi Zefan } 706261507a0SLi Zefan 707261507a0SLi Zefan if (compress_force) { 708b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 709143f3636SDavid Sterba } else { 7104027e0f4SWang Shilong /* 7114027e0f4SWang Shilong * If we remount from compress-force=xxx to 7124027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 7134027e0f4SWang Shilong * flag, otherwise, there is no way for users 7144027e0f4SWang Shilong * to disable forcible compression separately. 7154027e0f4SWang Shilong */ 7164027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 717a7e252afSMiao Xie } 71827942c99SDavid Sterba if (no_compress == 1) { 71927942c99SDavid Sterba btrfs_info(info, "use no compression"); 72027942c99SDavid Sterba } else if ((info->compress_type != saved_compress_type) || 72127942c99SDavid Sterba (compress_force != saved_compress_force) || 72227942c99SDavid Sterba (info->compress_level != saved_compress_level)) { 723f51d2b59SDavid Sterba btrfs_info(info, "%s %s compression, level %d", 724b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 725f51d2b59SDavid Sterba compress_type, info->compress_level); 726b7c47bbbSTsutomu Itoh } 727b7c47bbbSTsutomu Itoh compress_force = false; 728a555f810SChris Mason break; 729e18e4809SChris Mason case Opt_ssd: 7303cdde224SJeff Mahoney btrfs_set_and_info(info, SSD, 731583b7231SHans van Kranenburg "enabling ssd optimizations"); 732951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 733e18e4809SChris Mason break; 734451d7585SChris Mason case Opt_ssd_spread: 735583b7231SHans van Kranenburg btrfs_set_and_info(info, SSD, 736583b7231SHans van Kranenburg "enabling ssd optimizations"); 7373cdde224SJeff Mahoney btrfs_set_and_info(info, SSD_SPREAD, 738583b7231SHans van Kranenburg "using spread ssd allocation scheme"); 739951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 740451d7585SChris Mason break; 7413b30c22fSChris Mason case Opt_nossd: 742583b7231SHans van Kranenburg btrfs_set_opt(info->mount_opt, NOSSD); 743583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD, 744583b7231SHans van Kranenburg "not using ssd optimizations"); 745c730ae0cSMarcos Paulo de Souza fallthrough; 74662b8e077SHoward McLauchlan case Opt_nossd_spread: 747583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD_SPREAD, 748583b7231SHans van Kranenburg "not using spread ssd allocation scheme"); 7493b30c22fSChris Mason break; 750842bef58SQu Wenruo case Opt_barrier: 7513cdde224SJeff Mahoney btrfs_clear_and_info(info, NOBARRIER, 75207802534SQu Wenruo "turning on barriers"); 753842bef58SQu Wenruo break; 75421ad10cfSChris Mason case Opt_nobarrier: 7553cdde224SJeff Mahoney btrfs_set_and_info(info, NOBARRIER, 75607802534SQu Wenruo "turning off barriers"); 75721ad10cfSChris Mason break; 7584543df7eSChris Mason case Opt_thread_pool: 7592c334e87SWang Shilong ret = match_int(&args[0], &intarg); 7602c334e87SWang Shilong if (ret) { 7612c334e87SWang Shilong goto out; 762f7b885beSAnand Jain } else if (intarg == 0) { 7632c334e87SWang Shilong ret = -EINVAL; 7642c334e87SWang Shilong goto out; 7652c334e87SWang Shilong } 766f7b885beSAnand Jain info->thread_pool_size = intarg; 7674543df7eSChris Mason break; 7686f568d35SChris Mason case Opt_max_inline: 769edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 7706f568d35SChris Mason if (num) { 77191748467SAkinobu Mita info->max_inline = memparse(num, NULL); 7726f568d35SChris Mason kfree(num); 7736f568d35SChris Mason 77415ada040SChris Mason if (info->max_inline) { 775feb5f965SMitch Harder info->max_inline = min_t(u64, 77615ada040SChris Mason info->max_inline, 7770b246afaSJeff Mahoney info->sectorsize); 77815ada040SChris Mason } 7790b246afaSJeff Mahoney btrfs_info(info, "max_inline at %llu", 780c1c9ff7cSGeert Uytterhoeven info->max_inline); 7812c334e87SWang Shilong } else { 7822c334e87SWang Shilong ret = -ENOMEM; 7832c334e87SWang Shilong goto out; 7846f568d35SChris Mason } 7856f568d35SChris Mason break; 786bd0330adSQu Wenruo case Opt_acl: 78745ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 7881751e8a6SLinus Torvalds info->sb->s_flags |= SB_POSIXACL; 789bd0330adSQu Wenruo break; 79045ff35d6SGuangliang Zhao #else 7910b246afaSJeff Mahoney btrfs_err(info, "support for ACL not compiled in!"); 79245ff35d6SGuangliang Zhao ret = -EINVAL; 79345ff35d6SGuangliang Zhao goto out; 79445ff35d6SGuangliang Zhao #endif 79533268eafSJosef Bacik case Opt_noacl: 7961751e8a6SLinus Torvalds info->sb->s_flags &= ~SB_POSIXACL; 79733268eafSJosef Bacik break; 7983a5e1404SSage Weil case Opt_notreelog: 7993cdde224SJeff Mahoney btrfs_set_and_info(info, NOTREELOG, 80007802534SQu Wenruo "disabling tree log"); 8013a5e1404SSage Weil break; 802a88998f2SQu Wenruo case Opt_treelog: 8033cdde224SJeff Mahoney btrfs_clear_and_info(info, NOTREELOG, 80407802534SQu Wenruo "enabling tree log"); 805a88998f2SQu Wenruo break; 806fed8f166SQu Wenruo case Opt_norecovery: 80796da0919SQu Wenruo case Opt_nologreplay: 80874ef0018SQu Wenruo btrfs_warn(info, 80974ef0018SQu Wenruo "'nologreplay' is deprecated, use 'rescue=nologreplay' instead"); 8103cdde224SJeff Mahoney btrfs_set_and_info(info, NOLOGREPLAY, 81196da0919SQu Wenruo "disabling log replay at mount time"); 81296da0919SQu Wenruo break; 813dccae999SSage Weil case Opt_flushoncommit: 8143cdde224SJeff Mahoney btrfs_set_and_info(info, FLUSHONCOMMIT, 81507802534SQu Wenruo "turning on flush-on-commit"); 816dccae999SSage Weil break; 8172c9ee856SQu Wenruo case Opt_noflushoncommit: 8183cdde224SJeff Mahoney btrfs_clear_and_info(info, FLUSHONCOMMIT, 81907802534SQu Wenruo "turning off flush-on-commit"); 8202c9ee856SQu Wenruo break; 82197e728d4SJosef Bacik case Opt_ratio: 8222c334e87SWang Shilong ret = match_int(&args[0], &intarg); 823764cb8b4SAnand Jain if (ret) 8242c334e87SWang Shilong goto out; 82597e728d4SJosef Bacik info->metadata_ratio = intarg; 826764cb8b4SAnand Jain btrfs_info(info, "metadata ratio %u", 82797e728d4SJosef Bacik info->metadata_ratio); 82897e728d4SJosef Bacik break; 829e244a0aeSChristoph Hellwig case Opt_discard: 830b0643e59SDennis Zhou case Opt_discard_mode: 831b0643e59SDennis Zhou if (token == Opt_discard || 832b0643e59SDennis Zhou strcmp(args[0].from, "sync") == 0) { 833b0643e59SDennis Zhou btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC); 83446b27f50SDennis Zhou btrfs_set_and_info(info, DISCARD_SYNC, 83546b27f50SDennis Zhou "turning on sync discard"); 836b0643e59SDennis Zhou } else if (strcmp(args[0].from, "async") == 0) { 837b0643e59SDennis Zhou btrfs_clear_opt(info->mount_opt, DISCARD_SYNC); 838b0643e59SDennis Zhou btrfs_set_and_info(info, DISCARD_ASYNC, 839b0643e59SDennis Zhou "turning on async discard"); 840b0643e59SDennis Zhou } else { 841b0643e59SDennis Zhou ret = -EINVAL; 842b0643e59SDennis Zhou goto out; 843b0643e59SDennis Zhou } 844e244a0aeSChristoph Hellwig break; 845e07a2adeSQu Wenruo case Opt_nodiscard: 84646b27f50SDennis Zhou btrfs_clear_and_info(info, DISCARD_SYNC, 84707802534SQu Wenruo "turning off discard"); 848b0643e59SDennis Zhou btrfs_clear_and_info(info, DISCARD_ASYNC, 849b0643e59SDennis Zhou "turning off async discard"); 850e07a2adeSQu Wenruo break; 8510af3d00bSJosef Bacik case Opt_space_cache: 85270f6d82eSOmar Sandoval case Opt_space_cache_version: 85370f6d82eSOmar Sandoval if (token == Opt_space_cache || 85470f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 8550b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 85670f6d82eSOmar Sandoval FREE_SPACE_TREE); 8573cdde224SJeff Mahoney btrfs_set_and_info(info, SPACE_CACHE, 85807802534SQu Wenruo "enabling disk space caching"); 85970f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 8600b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 86170f6d82eSOmar Sandoval SPACE_CACHE); 8620b246afaSJeff Mahoney btrfs_set_and_info(info, FREE_SPACE_TREE, 86370f6d82eSOmar Sandoval "enabling free space tree"); 86470f6d82eSOmar Sandoval } else { 86570f6d82eSOmar Sandoval ret = -EINVAL; 86670f6d82eSOmar Sandoval goto out; 86770f6d82eSOmar Sandoval } 8680de90876SJosef Bacik break; 869f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 870f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 871f420ee1eSStefan Behrens break; 87273bc1876SJosef Bacik case Opt_no_space_cache: 8733cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) { 8740b246afaSJeff Mahoney btrfs_clear_and_info(info, SPACE_CACHE, 87507802534SQu Wenruo "disabling disk space caching"); 87670f6d82eSOmar Sandoval } 8773cdde224SJeff Mahoney if (btrfs_test_opt(info, FREE_SPACE_TREE)) { 8780b246afaSJeff Mahoney btrfs_clear_and_info(info, FREE_SPACE_TREE, 87970f6d82eSOmar Sandoval "disabling free space tree"); 88070f6d82eSOmar Sandoval } 88173bc1876SJosef Bacik break; 8824b9465cbSChris Mason case Opt_inode_cache: 8833818aea2SQu Wenruo case Opt_noinode_cache: 8845297199aSNikolay Borisov btrfs_warn(info, 8855297199aSNikolay Borisov "the 'inode_cache' option is deprecated and has no effect since 5.11"); 8864b9465cbSChris Mason break; 88788c2ba3bSJosef Bacik case Opt_clear_cache: 8883cdde224SJeff Mahoney btrfs_set_and_info(info, CLEAR_CACHE, 88907802534SQu Wenruo "force clearing of disk cache"); 8900af3d00bSJosef Bacik break; 8914260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 8924260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 8934260f7c7SSage Weil break; 89491435650SChris Mason case Opt_enospc_debug: 89591435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 89691435650SChris Mason break; 89753036293SQu Wenruo case Opt_noenospc_debug: 89853036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 89953036293SQu Wenruo break; 9004cb5300bSChris Mason case Opt_defrag: 9013cdde224SJeff Mahoney btrfs_set_and_info(info, AUTO_DEFRAG, 90207802534SQu Wenruo "enabling auto defrag"); 9034cb5300bSChris Mason break; 904fc0ca9afSQu Wenruo case Opt_nodefrag: 9053cdde224SJeff Mahoney btrfs_clear_and_info(info, AUTO_DEFRAG, 90607802534SQu Wenruo "disabling auto defrag"); 907fc0ca9afSQu Wenruo break; 908af31f5e5SChris Mason case Opt_recovery: 9098dcddfa0SQu Wenruo case Opt_usebackuproot: 91074ef0018SQu Wenruo btrfs_warn(info, 91174ef0018SQu Wenruo "'%s' is deprecated, use 'rescue=usebackuproot' instead", 91274ef0018SQu Wenruo token == Opt_recovery ? "recovery" : 91374ef0018SQu Wenruo "usebackuproot"); 9140b246afaSJeff Mahoney btrfs_info(info, 9158dcddfa0SQu Wenruo "trying to use backup root at mount time"); 9168dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 917af31f5e5SChris Mason break; 9189555c6c1SIlya Dryomov case Opt_skip_balance: 9199555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 9209555c6c1SIlya Dryomov break; 92121adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 92221adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 9230b246afaSJeff Mahoney btrfs_info(info, 924efe120a0SFrank Holton "enabling check integrity including extent data"); 92521adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 92621adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 92721adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 92821adbd5cSStefan Behrens break; 92921adbd5cSStefan Behrens case Opt_check_integrity: 9300b246afaSJeff Mahoney btrfs_info(info, "enabling check integrity"); 93121adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 93221adbd5cSStefan Behrens break; 93321adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 9342c334e87SWang Shilong ret = match_int(&args[0], &intarg); 93502453bdeSAnand Jain if (ret) 9362c334e87SWang Shilong goto out; 93721adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 93802453bdeSAnand Jain btrfs_info(info, "check_integrity_print_mask 0x%x", 93921adbd5cSStefan Behrens info->check_integrity_print_mask); 94021adbd5cSStefan Behrens break; 94121adbd5cSStefan Behrens #else 94221adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 94321adbd5cSStefan Behrens case Opt_check_integrity: 94421adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 9450b246afaSJeff Mahoney btrfs_err(info, 946efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 94721adbd5cSStefan Behrens ret = -EINVAL; 94821adbd5cSStefan Behrens goto out; 94921adbd5cSStefan Behrens #endif 9508c342930SJeff Mahoney case Opt_fatal_errors: 9518c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 9528c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 9538c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 9548c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 9558c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 9568c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 9578c342930SJeff Mahoney else { 9588c342930SJeff Mahoney ret = -EINVAL; 9598c342930SJeff Mahoney goto out; 9608c342930SJeff Mahoney } 9618c342930SJeff Mahoney break; 9628b87dc17SDavid Sterba case Opt_commit_interval: 9638b87dc17SDavid Sterba intarg = 0; 9648b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 965d3740608SAnand Jain if (ret) 9668b87dc17SDavid Sterba goto out; 967d3740608SAnand Jain if (intarg == 0) { 968d3740608SAnand Jain btrfs_info(info, 969d3740608SAnand Jain "using default commit interval %us", 970d3740608SAnand Jain BTRFS_DEFAULT_COMMIT_INTERVAL); 971d3740608SAnand Jain intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; 972d3740608SAnand Jain } else if (intarg > 300) { 973d3740608SAnand Jain btrfs_warn(info, "excessive commit interval %d", 9748b87dc17SDavid Sterba intarg); 9758b87dc17SDavid Sterba } 9768b87dc17SDavid Sterba info->commit_interval = intarg; 9778b87dc17SDavid Sterba break; 97874ef0018SQu Wenruo case Opt_rescue: 97974ef0018SQu Wenruo ret = parse_rescue_options(info, args[0].from); 98074ef0018SQu Wenruo if (ret < 0) 98174ef0018SQu Wenruo goto out; 98274ef0018SQu Wenruo break; 983d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 984d0bd4560SJosef Bacik case Opt_fragment_all: 9850b246afaSJeff Mahoney btrfs_info(info, "fragmenting all space"); 986d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 987d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 988d0bd4560SJosef Bacik break; 989d0bd4560SJosef Bacik case Opt_fragment_metadata: 9900b246afaSJeff Mahoney btrfs_info(info, "fragmenting metadata"); 991d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 992d0bd4560SJosef Bacik FRAGMENT_METADATA); 993d0bd4560SJosef Bacik break; 994d0bd4560SJosef Bacik case Opt_fragment_data: 9950b246afaSJeff Mahoney btrfs_info(info, "fragmenting data"); 996d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 997d0bd4560SJosef Bacik break; 998d0bd4560SJosef Bacik #endif 999fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 1000fb592373SJosef Bacik case Opt_ref_verify: 1001fb592373SJosef Bacik btrfs_info(info, "doing ref verification"); 1002fb592373SJosef Bacik btrfs_set_opt(info->mount_opt, REF_VERIFY); 1003fb592373SJosef Bacik break; 1004fb592373SJosef Bacik #endif 1005a7a3f7caSSage Weil case Opt_err: 10067e8f19e5SDavid Sterba btrfs_err(info, "unrecognized mount option '%s'", p); 1007a7a3f7caSSage Weil ret = -EINVAL; 1008a7a3f7caSSage Weil goto out; 100995e05289SChris Mason default: 1010be20aa9dSChris Mason break; 101195e05289SChris Mason } 101295e05289SChris Mason } 101396da0919SQu Wenruo check: 1014d70bf748SJosef Bacik /* We're read-only, don't have to check. */ 1015d70bf748SJosef Bacik if (new_flags & SB_RDONLY) 1016d70bf748SJosef Bacik goto out; 1017d70bf748SJosef Bacik 101842437a63SJosef Bacik if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || 1019882dbe0cSJosef Bacik check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || 1020882dbe0cSJosef Bacik check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")) 102196da0919SQu Wenruo ret = -EINVAL; 1022a7a3f7caSSage Weil out: 10230b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && 10243cdde224SJeff Mahoney !btrfs_test_opt(info, FREE_SPACE_TREE) && 10253cdde224SJeff Mahoney !btrfs_test_opt(info, CLEAR_CACHE)) { 10260b246afaSJeff Mahoney btrfs_err(info, "cannot disable free space tree"); 102770f6d82eSOmar Sandoval ret = -EINVAL; 102870f6d82eSOmar Sandoval 102970f6d82eSOmar Sandoval } 10305d1ab66cSNaohiro Aota if (!ret) 10315d1ab66cSNaohiro Aota ret = btrfs_check_mountopts_zoned(info); 10323cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, SPACE_CACHE)) 10330b246afaSJeff Mahoney btrfs_info(info, "disk space caching is enabled"); 10343cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) 10350b246afaSJeff Mahoney btrfs_info(info, "using free space tree"); 1036a7a3f7caSSage Weil return ret; 1037edf24abeSChristoph Hellwig } 1038edf24abeSChristoph Hellwig 1039edf24abeSChristoph Hellwig /* 1040edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 1041edf24abeSChristoph Hellwig * 1042edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 1043edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 1044edf24abeSChristoph Hellwig */ 1045fa59f27cSAnand Jain static int btrfs_parse_device_options(const char *options, fmode_t flags, 1046d64dcbd1SGu Jinxiang void *holder) 1047edf24abeSChristoph Hellwig { 1048edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 104983c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 105036350e95SGu Jinxiang struct btrfs_device *device = NULL; 1051d7407606SMisono, Tomohiro int error = 0; 1052d7407606SMisono, Tomohiro 10535139cff5SDavid Sterba lockdep_assert_held(&uuid_mutex); 10545139cff5SDavid Sterba 1055d7407606SMisono, Tomohiro if (!options) 1056d7407606SMisono, Tomohiro return 0; 1057d7407606SMisono, Tomohiro 1058d7407606SMisono, Tomohiro /* 1059d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because btrfs_parse_options 1060d7407606SMisono, Tomohiro * gets called later 1061d7407606SMisono, Tomohiro */ 1062d7407606SMisono, Tomohiro opts = kstrdup(options, GFP_KERNEL); 1063d7407606SMisono, Tomohiro if (!opts) 1064d7407606SMisono, Tomohiro return -ENOMEM; 1065d7407606SMisono, Tomohiro orig = opts; 1066d7407606SMisono, Tomohiro 1067d7407606SMisono, Tomohiro while ((p = strsep(&opts, ",")) != NULL) { 1068d7407606SMisono, Tomohiro int token; 1069d7407606SMisono, Tomohiro 1070d7407606SMisono, Tomohiro if (!*p) 1071d7407606SMisono, Tomohiro continue; 1072d7407606SMisono, Tomohiro 1073d7407606SMisono, Tomohiro token = match_token(p, tokens, args); 1074d7407606SMisono, Tomohiro if (token == Opt_device) { 1075d7407606SMisono, Tomohiro device_name = match_strdup(&args[0]); 1076d7407606SMisono, Tomohiro if (!device_name) { 1077d7407606SMisono, Tomohiro error = -ENOMEM; 1078d7407606SMisono, Tomohiro goto out; 1079d7407606SMisono, Tomohiro } 108036350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, flags, 108136350e95SGu Jinxiang holder); 1082d7407606SMisono, Tomohiro kfree(device_name); 108336350e95SGu Jinxiang if (IS_ERR(device)) { 108436350e95SGu Jinxiang error = PTR_ERR(device); 1085d7407606SMisono, Tomohiro goto out; 1086d7407606SMisono, Tomohiro } 1087d7407606SMisono, Tomohiro } 108836350e95SGu Jinxiang } 1089d7407606SMisono, Tomohiro 1090d7407606SMisono, Tomohiro out: 1091d7407606SMisono, Tomohiro kfree(orig); 1092d7407606SMisono, Tomohiro return error; 1093d7407606SMisono, Tomohiro } 1094d7407606SMisono, Tomohiro 1095d7407606SMisono, Tomohiro /* 1096d7407606SMisono, Tomohiro * Parse mount options that are related to subvolume id 1097d7407606SMisono, Tomohiro * 1098d7407606SMisono, Tomohiro * The value is later passed to mount_subvol() 1099d7407606SMisono, Tomohiro */ 110093b9bcdfSGu Jinxiang static int btrfs_parse_subvol_options(const char *options, char **subvol_name, 110193b9bcdfSGu Jinxiang u64 *subvol_objectid) 1102d7407606SMisono, Tomohiro { 1103d7407606SMisono, Tomohiro substring_t args[MAX_OPT_ARGS]; 1104d7407606SMisono, Tomohiro char *opts, *orig, *p; 1105edf24abeSChristoph Hellwig int error = 0; 1106ccb0e7d1SAnand Jain u64 subvolid; 1107edf24abeSChristoph Hellwig 1108edf24abeSChristoph Hellwig if (!options) 1109830c4adbSJosef Bacik return 0; 1110edf24abeSChristoph Hellwig 1111edf24abeSChristoph Hellwig /* 1112d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because 1113fa59f27cSAnand Jain * btrfs_parse_device_options gets called later 1114edf24abeSChristoph Hellwig */ 1115edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 1116edf24abeSChristoph Hellwig if (!opts) 1117edf24abeSChristoph Hellwig return -ENOMEM; 11183f3d0bc0STero Roponen orig = opts; 1119edf24abeSChristoph Hellwig 1120edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 1121edf24abeSChristoph Hellwig int token; 1122edf24abeSChristoph Hellwig if (!*p) 1123edf24abeSChristoph Hellwig continue; 1124edf24abeSChristoph Hellwig 1125edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 1126edf24abeSChristoph Hellwig switch (token) { 1127edf24abeSChristoph Hellwig case Opt_subvol: 1128a90e8b6fSIlya Dryomov kfree(*subvol_name); 1129edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 11302c334e87SWang Shilong if (!*subvol_name) { 11312c334e87SWang Shilong error = -ENOMEM; 11322c334e87SWang Shilong goto out; 11332c334e87SWang Shilong } 1134edf24abeSChristoph Hellwig break; 113573f73415SJosef Bacik case Opt_subvolid: 1136ccb0e7d1SAnand Jain error = match_u64(&args[0], &subvolid); 1137ccb0e7d1SAnand Jain if (error) 11382c334e87SWang Shilong goto out; 1139ccb0e7d1SAnand Jain 1140ccb0e7d1SAnand Jain /* we want the original fs_tree */ 1141ccb0e7d1SAnand Jain if (subvolid == 0) 1142ccb0e7d1SAnand Jain subvolid = BTRFS_FS_TREE_OBJECTID; 1143ccb0e7d1SAnand Jain 1144ccb0e7d1SAnand Jain *subvol_objectid = subvolid; 114573f73415SJosef Bacik break; 1146edf24abeSChristoph Hellwig default: 1147edf24abeSChristoph Hellwig break; 1148edf24abeSChristoph Hellwig } 1149edf24abeSChristoph Hellwig } 1150edf24abeSChristoph Hellwig 1151edf24abeSChristoph Hellwig out: 1152830c4adbSJosef Bacik kfree(orig); 1153edf24abeSChristoph Hellwig return error; 115495e05289SChris Mason } 115595e05289SChris Mason 1156c0c907a4SMarcos Paulo de Souza char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 115773f73415SJosef Bacik u64 subvol_objectid) 115873f73415SJosef Bacik { 1159815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 11605168489aSJosef Bacik struct btrfs_root *fs_root = NULL; 116105dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 116205dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 116305dbe683SOmar Sandoval struct btrfs_key key; 116405dbe683SOmar Sandoval struct btrfs_path *path = NULL; 116505dbe683SOmar Sandoval char *name = NULL, *ptr; 116605dbe683SOmar Sandoval u64 dirid; 116705dbe683SOmar Sandoval int len; 116805dbe683SOmar Sandoval int ret; 116905dbe683SOmar Sandoval 117005dbe683SOmar Sandoval path = btrfs_alloc_path(); 117105dbe683SOmar Sandoval if (!path) { 117205dbe683SOmar Sandoval ret = -ENOMEM; 117305dbe683SOmar Sandoval goto err; 117405dbe683SOmar Sandoval } 117505dbe683SOmar Sandoval 11763ec83621SDavid Sterba name = kmalloc(PATH_MAX, GFP_KERNEL); 117705dbe683SOmar Sandoval if (!name) { 117805dbe683SOmar Sandoval ret = -ENOMEM; 117905dbe683SOmar Sandoval goto err; 118005dbe683SOmar Sandoval } 118105dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 118205dbe683SOmar Sandoval ptr[0] = '\0'; 118305dbe683SOmar Sandoval 118405dbe683SOmar Sandoval /* 118505dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 118605dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 118705dbe683SOmar Sandoval */ 118805dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 118905dbe683SOmar Sandoval key.objectid = subvol_objectid; 119005dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 119105dbe683SOmar Sandoval key.offset = (u64)-1; 119205dbe683SOmar Sandoval 119305dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 119405dbe683SOmar Sandoval if (ret < 0) { 119505dbe683SOmar Sandoval goto err; 119605dbe683SOmar Sandoval } else if (ret > 0) { 119705dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 119805dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 119905dbe683SOmar Sandoval if (ret < 0) { 120005dbe683SOmar Sandoval goto err; 120105dbe683SOmar Sandoval } else if (ret > 0) { 120205dbe683SOmar Sandoval ret = -ENOENT; 120305dbe683SOmar Sandoval goto err; 120405dbe683SOmar Sandoval } 120505dbe683SOmar Sandoval } 120605dbe683SOmar Sandoval 120705dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 120805dbe683SOmar Sandoval subvol_objectid = key.offset; 120905dbe683SOmar Sandoval 121005dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 121105dbe683SOmar Sandoval struct btrfs_root_ref); 121205dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 121305dbe683SOmar Sandoval ptr -= len + 1; 121405dbe683SOmar Sandoval if (ptr < name) { 121505dbe683SOmar Sandoval ret = -ENAMETOOLONG; 121605dbe683SOmar Sandoval goto err; 121705dbe683SOmar Sandoval } 121805dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 121905dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 122005dbe683SOmar Sandoval ptr[0] = '/'; 122105dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 122205dbe683SOmar Sandoval btrfs_release_path(path); 122305dbe683SOmar Sandoval 122456e9357aSDavid Sterba fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true); 122505dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 122605dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 12275168489aSJosef Bacik fs_root = NULL; 12285168489aSJosef Bacik goto err; 12295168489aSJosef Bacik } 123005dbe683SOmar Sandoval 123105dbe683SOmar Sandoval /* 123205dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 123305dbe683SOmar Sandoval * root directory. 123405dbe683SOmar Sandoval */ 123505dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 123605dbe683SOmar Sandoval key.objectid = dirid; 123705dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 123805dbe683SOmar Sandoval key.offset = (u64)-1; 123905dbe683SOmar Sandoval 124005dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 124105dbe683SOmar Sandoval if (ret < 0) { 124205dbe683SOmar Sandoval goto err; 124305dbe683SOmar Sandoval } else if (ret > 0) { 124405dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 124505dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 124605dbe683SOmar Sandoval if (ret < 0) { 124705dbe683SOmar Sandoval goto err; 124805dbe683SOmar Sandoval } else if (ret > 0) { 124905dbe683SOmar Sandoval ret = -ENOENT; 125005dbe683SOmar Sandoval goto err; 125105dbe683SOmar Sandoval } 125205dbe683SOmar Sandoval } 125305dbe683SOmar Sandoval 125405dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 125505dbe683SOmar Sandoval dirid = key.offset; 125605dbe683SOmar Sandoval 125705dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 125805dbe683SOmar Sandoval path->slots[0], 125905dbe683SOmar Sandoval struct btrfs_inode_ref); 126005dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 126105dbe683SOmar Sandoval inode_ref); 126205dbe683SOmar Sandoval ptr -= len + 1; 126305dbe683SOmar Sandoval if (ptr < name) { 126405dbe683SOmar Sandoval ret = -ENAMETOOLONG; 126505dbe683SOmar Sandoval goto err; 126605dbe683SOmar Sandoval } 126705dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 126805dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 126905dbe683SOmar Sandoval ptr[0] = '/'; 127005dbe683SOmar Sandoval btrfs_release_path(path); 127105dbe683SOmar Sandoval } 127200246528SJosef Bacik btrfs_put_root(fs_root); 12735168489aSJosef Bacik fs_root = NULL; 127405dbe683SOmar Sandoval } 127505dbe683SOmar Sandoval 127605dbe683SOmar Sandoval btrfs_free_path(path); 127705dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 127805dbe683SOmar Sandoval name[0] = '/'; 127905dbe683SOmar Sandoval name[1] = '\0'; 128005dbe683SOmar Sandoval } else { 128105dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 128205dbe683SOmar Sandoval } 128305dbe683SOmar Sandoval return name; 128405dbe683SOmar Sandoval 128505dbe683SOmar Sandoval err: 128600246528SJosef Bacik btrfs_put_root(fs_root); 128705dbe683SOmar Sandoval btrfs_free_path(path); 128805dbe683SOmar Sandoval kfree(name); 128905dbe683SOmar Sandoval return ERR_PTR(ret); 129005dbe683SOmar Sandoval } 129105dbe683SOmar Sandoval 129205dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 129305dbe683SOmar Sandoval { 129405dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 129573f73415SJosef Bacik struct btrfs_dir_item *di; 129673f73415SJosef Bacik struct btrfs_path *path; 129773f73415SJosef Bacik struct btrfs_key location; 129873f73415SJosef Bacik u64 dir_id; 129973f73415SJosef Bacik 130073f73415SJosef Bacik path = btrfs_alloc_path(); 130173f73415SJosef Bacik if (!path) 130205dbe683SOmar Sandoval return -ENOMEM; 130373f73415SJosef Bacik 130473f73415SJosef Bacik /* 130573f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 130673f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 130773f73415SJosef Bacik * to mount. 130873f73415SJosef Bacik */ 1309815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 131073f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1311b0839166SJulia Lawall if (IS_ERR(di)) { 1312b0839166SJulia Lawall btrfs_free_path(path); 131305dbe683SOmar Sandoval return PTR_ERR(di); 1314b0839166SJulia Lawall } 131573f73415SJosef Bacik if (!di) { 131673f73415SJosef Bacik /* 131773f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 131873f73415SJosef Bacik * it's always been there, but don't freak out, just try and 131905dbe683SOmar Sandoval * mount the top-level subvolume. 132073f73415SJosef Bacik */ 132173f73415SJosef Bacik btrfs_free_path(path); 132205dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 132305dbe683SOmar Sandoval return 0; 132473f73415SJosef Bacik } 132573f73415SJosef Bacik 132673f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 132773f73415SJosef Bacik btrfs_free_path(path); 132805dbe683SOmar Sandoval *objectid = location.objectid; 132905dbe683SOmar Sandoval return 0; 133073f73415SJosef Bacik } 133173f73415SJosef Bacik 13328a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 13338a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 133456e033a7SDavid Sterba void *data) 13352e635a27SChris Mason { 13362e635a27SChris Mason struct inode *inode; 1337815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 133839279cc3SChris Mason int err; 13392e635a27SChris Mason 13402e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 13412e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1342e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1343af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1344be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 13455103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 13462e635a27SChris Mason sb->s_time_gran = 1; 13470eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 13481751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 134949cf6f45SChris Ball #endif 1350357fdad0SMatthew Garrett sb->s_flags |= SB_I_VERSION; 1351da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 13529e11ceeeSJan Kara 13539e11ceeeSJan Kara err = super_setup_bdi(sb); 13549e11ceeeSJan Kara if (err) { 13559e11ceeeSJan Kara btrfs_err(fs_info, "super_setup_bdi failed"); 13569e11ceeeSJan Kara return err; 13579e11ceeeSJan Kara } 13589e11ceeeSJan Kara 1359ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1360ad2b2c80SAl Viro if (err) { 1361ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "open_ctree failed"); 1362ad2b2c80SAl Viro return err; 1363e20d96d6SChris Mason } 1364b888db2bSChris Mason 13650202e83fSDavid Sterba inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root); 13665d4f98a2SYan Zheng if (IS_ERR(inode)) { 13675d4f98a2SYan Zheng err = PTR_ERR(inode); 136839279cc3SChris Mason goto fail_close; 136939279cc3SChris Mason } 13702e635a27SChris Mason 137148fde701SAl Viro sb->s_root = d_make_root(inode); 137248fde701SAl Viro if (!sb->s_root) { 137339279cc3SChris Mason err = -ENOMEM; 137439279cc3SChris Mason goto fail_close; 13752e635a27SChris Mason } 137658176a96SJosef Bacik 137790a887c9SDan Magenheimer cleancache_init_fs(sb); 13781751e8a6SLinus Torvalds sb->s_flags |= SB_ACTIVE; 13792e635a27SChris Mason return 0; 13802e635a27SChris Mason 138139279cc3SChris Mason fail_close: 13826bccf3abSJeff Mahoney close_ctree(fs_info); 1383d5719762SChris Mason return err; 1384d5719762SChris Mason } 1385d5719762SChris Mason 13866bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1387d5719762SChris Mason { 1388d5719762SChris Mason struct btrfs_trans_handle *trans; 1389815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1390815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1391df2ce34cSChris Mason 1392bc074524SJeff Mahoney trace_btrfs_sync_fs(fs_info, wait); 13931abe9b8aSliubo 1394d561c025SChris Mason if (!wait) { 1395815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1396df2ce34cSChris Mason return 0; 1397d561c025SChris Mason } 1398771ed689SChris Mason 13996374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 1400771ed689SChris Mason 1401d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 140260376ce4SJosef Bacik if (IS_ERR(trans)) { 1403354aa0fbSMiao Xie /* no transaction, don't bother */ 14046b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 14056b5fe46dSDavid Sterba /* 14066b5fe46dSDavid Sterba * Exit unless we have some pending changes 14076b5fe46dSDavid Sterba * that need to go through commit 14086b5fe46dSDavid Sterba */ 14096b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1410bd7de2c9SJosef Bacik return 0; 1411a53f4f8eSQu Wenruo /* 1412a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1413a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1414a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1415a53f4f8eSQu Wenruo * next commit after thawing. 1416a53f4f8eSQu Wenruo */ 1417a7e3c5f2SRakesh Pandit if (sb_start_write_trylock(sb)) 1418a7e3c5f2SRakesh Pandit sb_end_write(sb); 1419a53f4f8eSQu Wenruo else 1420a53f4f8eSQu Wenruo return 0; 14216b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 142260376ce4SJosef Bacik } 142398bd5c54SDavid Sterba if (IS_ERR(trans)) 142498bd5c54SDavid Sterba return PTR_ERR(trans); 14256b5fe46dSDavid Sterba } 14263a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 1427d5719762SChris Mason } 1428d5719762SChris Mason 1429ab0b4a3eSJosef Bacik static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed) 1430ab0b4a3eSJosef Bacik { 1431ab0b4a3eSJosef Bacik seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s); 1432ab0b4a3eSJosef Bacik *printed = true; 1433ab0b4a3eSJosef Bacik } 1434ab0b4a3eSJosef Bacik 143534c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1436a9572a15SEric Paris { 1437815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 14380f628c63SDavid Sterba const char *compress_type; 14393ef3959bSJosef Bacik const char *subvol_name; 1440ab0b4a3eSJosef Bacik bool printed = false; 1441a9572a15SEric Paris 14423cdde224SJeff Mahoney if (btrfs_test_opt(info, DEGRADED)) 1443a9572a15SEric Paris seq_puts(seq, ",degraded"); 14443cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) 1445a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 14463cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 1447a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 14483cdde224SJeff Mahoney if (btrfs_test_opt(info, NOBARRIER)) 1449a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 145095ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1451c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1452a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1453a9572a15SEric Paris num_online_cpus() + 2, 8)) 1454f7b885beSAnand Jain seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); 14553cdde224SJeff Mahoney if (btrfs_test_opt(info, COMPRESS)) { 14560f628c63SDavid Sterba compress_type = btrfs_compress_type2str(info->compress_type); 14573cdde224SJeff Mahoney if (btrfs_test_opt(info, FORCE_COMPRESS)) 1458200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1459200da64eSTsutomu Itoh else 1460200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1461f51d2b59SDavid Sterba if (info->compress_level) 1462fa4d885aSAdam Borowski seq_printf(seq, ":%d", info->compress_level); 1463200da64eSTsutomu Itoh } 14643cdde224SJeff Mahoney if (btrfs_test_opt(info, NOSSD)) 1465c289811cSChris Mason seq_puts(seq, ",nossd"); 14663cdde224SJeff Mahoney if (btrfs_test_opt(info, SSD_SPREAD)) 1467451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 14683cdde224SJeff Mahoney else if (btrfs_test_opt(info, SSD)) 1469a9572a15SEric Paris seq_puts(seq, ",ssd"); 14703cdde224SJeff Mahoney if (btrfs_test_opt(info, NOTREELOG)) 14716b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 14723cdde224SJeff Mahoney if (btrfs_test_opt(info, NOLOGREPLAY)) 1473ab0b4a3eSJosef Bacik print_rescue_option(seq, "nologreplay", &printed); 147468319c18SJosef Bacik if (btrfs_test_opt(info, USEBACKUPROOT)) 147568319c18SJosef Bacik print_rescue_option(seq, "usebackuproot", &printed); 147642437a63SJosef Bacik if (btrfs_test_opt(info, IGNOREBADROOTS)) 147742437a63SJosef Bacik print_rescue_option(seq, "ignorebadroots", &printed); 1478882dbe0cSJosef Bacik if (btrfs_test_opt(info, IGNOREDATACSUMS)) 1479882dbe0cSJosef Bacik print_rescue_option(seq, "ignoredatacsums", &printed); 14803cdde224SJeff Mahoney if (btrfs_test_opt(info, FLUSHONCOMMIT)) 14816b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 148246b27f50SDennis Zhou if (btrfs_test_opt(info, DISCARD_SYNC)) 148320a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 1484b0643e59SDennis Zhou if (btrfs_test_opt(info, DISCARD_ASYNC)) 1485b0643e59SDennis Zhou seq_puts(seq, ",discard=async"); 14861751e8a6SLinus Torvalds if (!(info->sb->s_flags & SB_POSIXACL)) 1487a9572a15SEric Paris seq_puts(seq, ",noacl"); 14883cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) 1489200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 14903cdde224SJeff Mahoney else if (btrfs_test_opt(info, FREE_SPACE_TREE)) 149170f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 149273bc1876SJosef Bacik else 14938965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 14943cdde224SJeff Mahoney if (btrfs_test_opt(info, RESCAN_UUID_TREE)) 1495f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 14963cdde224SJeff Mahoney if (btrfs_test_opt(info, CLEAR_CACHE)) 1497200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 14983cdde224SJeff Mahoney if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) 1499200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 15003cdde224SJeff Mahoney if (btrfs_test_opt(info, ENOSPC_DEBUG)) 15010942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 15023cdde224SJeff Mahoney if (btrfs_test_opt(info, AUTO_DEFRAG)) 15030942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 15043cdde224SJeff Mahoney if (btrfs_test_opt(info, SKIP_BALANCE)) 15059555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 15068507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 15073cdde224SJeff Mahoney if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 15088507d216SWang Shilong seq_puts(seq, ",check_int_data"); 15093cdde224SJeff Mahoney else if (btrfs_test_opt(info, CHECK_INTEGRITY)) 15108507d216SWang Shilong seq_puts(seq, ",check_int"); 15118507d216SWang Shilong if (info->check_integrity_print_mask) 15128507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 15138507d216SWang Shilong info->check_integrity_print_mask); 15148507d216SWang Shilong #endif 15158507d216SWang Shilong if (info->metadata_ratio) 1516764cb8b4SAnand Jain seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); 15173cdde224SJeff Mahoney if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) 15188c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 15198b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 1520d3740608SAnand Jain seq_printf(seq, ",commit=%u", info->commit_interval); 1521d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 15223cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_DATA)) 1523d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 15243cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_METADATA)) 1525d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1526d0bd4560SJosef Bacik #endif 1527fb592373SJosef Bacik if (btrfs_test_opt(info, REF_VERIFY)) 1528fb592373SJosef Bacik seq_puts(seq, ",ref_verify"); 1529c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1530c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 15313ef3959bSJosef Bacik subvol_name = btrfs_get_subvol_name_from_objectid(info, 15323ef3959bSJosef Bacik BTRFS_I(d_inode(dentry))->root->root_key.objectid); 15333ef3959bSJosef Bacik if (!IS_ERR(subvol_name)) { 1534c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 15353ef3959bSJosef Bacik seq_escape(seq, subvol_name, " \t\n\\"); 15363ef3959bSJosef Bacik kfree(subvol_name); 15373ef3959bSJosef Bacik } 1538a9572a15SEric Paris return 0; 1539a9572a15SEric Paris } 1540a9572a15SEric Paris 1541a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 15422e635a27SChris Mason { 1543815745cfSAl Viro struct btrfs_fs_info *p = data; 1544815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 15454b82d6e4SYan 1546815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 15474b82d6e4SYan } 15484b82d6e4SYan 1549450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1550450ba0eaSJosef Bacik { 15516de1d09dSAl Viro int err = set_anon_super(s, data); 15526de1d09dSAl Viro if (!err) 1553450ba0eaSJosef Bacik s->s_fs_info = data; 15546de1d09dSAl Viro return err; 1555450ba0eaSJosef Bacik } 1556450ba0eaSJosef Bacik 1557830c4adbSJosef Bacik /* 1558f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1559f9d9ef62SDavid Sterba */ 1560f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1561f9d9ef62SDavid Sterba { 1562f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1563f9d9ef62SDavid Sterba return 1; 1564f9d9ef62SDavid Sterba return 0; 1565f9d9ef62SDavid Sterba } 1566f9d9ef62SDavid Sterba 1567bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1568ae0bc863SAnand Jain struct vfsmount *mnt) 1569830c4adbSJosef Bacik { 1570830c4adbSJosef Bacik struct dentry *root; 1571fa330659SOmar Sandoval int ret; 1572830c4adbSJosef Bacik 157305dbe683SOmar Sandoval if (!subvol_name) { 157405dbe683SOmar Sandoval if (!subvol_objectid) { 157505dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 157605dbe683SOmar Sandoval &subvol_objectid); 157705dbe683SOmar Sandoval if (ret) { 157805dbe683SOmar Sandoval root = ERR_PTR(ret); 157905dbe683SOmar Sandoval goto out; 158005dbe683SOmar Sandoval } 158105dbe683SOmar Sandoval } 1582c0c907a4SMarcos Paulo de Souza subvol_name = btrfs_get_subvol_name_from_objectid( 1583c0c907a4SMarcos Paulo de Souza btrfs_sb(mnt->mnt_sb), subvol_objectid); 158405dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 158505dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 158605dbe683SOmar Sandoval subvol_name = NULL; 158705dbe683SOmar Sandoval goto out; 158805dbe683SOmar Sandoval } 158905dbe683SOmar Sandoval 159005dbe683SOmar Sandoval } 159105dbe683SOmar Sandoval 1592ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1593fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1594fa330659SOmar Sandoval mnt = NULL; 1595830c4adbSJosef Bacik 1596bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1597ea441d11SAl Viro struct super_block *s = root->d_sb; 1598ab8d0fc4SJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(s); 1599bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1600bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1601bb289b7bSOmar Sandoval 1602bb289b7bSOmar Sandoval ret = 0; 1603bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1604ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "'%s' is not a valid subvolume", 1605bb289b7bSOmar Sandoval subvol_name); 1606bb289b7bSOmar Sandoval ret = -EINVAL; 1607bb289b7bSOmar Sandoval } 1608bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 160905dbe683SOmar Sandoval /* 161005dbe683SOmar Sandoval * This will also catch a race condition where a 161105dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 161205dbe683SOmar Sandoval * another subvolume is renamed over the old location. 161305dbe683SOmar Sandoval */ 1614ab8d0fc4SJeff Mahoney btrfs_err(fs_info, 1615ab8d0fc4SJeff Mahoney "subvol '%s' does not match subvolid %llu", 1616bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1617bb289b7bSOmar Sandoval ret = -EINVAL; 1618bb289b7bSOmar Sandoval } 1619bb289b7bSOmar Sandoval if (ret) { 1620ea441d11SAl Viro dput(root); 1621bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1622ea441d11SAl Viro deactivate_locked_super(s); 1623bb289b7bSOmar Sandoval } 1624f9d9ef62SDavid Sterba } 1625f9d9ef62SDavid Sterba 1626fa330659SOmar Sandoval out: 1627fa330659SOmar Sandoval mntput(mnt); 1628fa330659SOmar Sandoval kfree(subvol_name); 1629830c4adbSJosef Bacik return root; 1630830c4adbSJosef Bacik } 1631450ba0eaSJosef Bacik 1632312c89fbSMisono, Tomohiro /* 1633312c89fbSMisono, Tomohiro * Find a superblock for the given device / mount point. 1634312c89fbSMisono, Tomohiro * 1635312c89fbSMisono, Tomohiro * Note: This is based on mount_bdev from fs/super.c with a few additions 1636312c89fbSMisono, Tomohiro * for multiple device setup. Make sure to keep it in sync. 1637312c89fbSMisono, Tomohiro */ 163872fa39f5SMisono, Tomohiro static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 163972fa39f5SMisono, Tomohiro int flags, const char *device_name, void *data) 164072fa39f5SMisono, Tomohiro { 164172fa39f5SMisono, Tomohiro struct block_device *bdev = NULL; 164272fa39f5SMisono, Tomohiro struct super_block *s; 164336350e95SGu Jinxiang struct btrfs_device *device = NULL; 164472fa39f5SMisono, Tomohiro struct btrfs_fs_devices *fs_devices = NULL; 164572fa39f5SMisono, Tomohiro struct btrfs_fs_info *fs_info = NULL; 1646204cc0ccSAl Viro void *new_sec_opts = NULL; 164772fa39f5SMisono, Tomohiro fmode_t mode = FMODE_READ; 164872fa39f5SMisono, Tomohiro int error = 0; 164972fa39f5SMisono, Tomohiro 165072fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY)) 165172fa39f5SMisono, Tomohiro mode |= FMODE_WRITE; 165272fa39f5SMisono, Tomohiro 165372fa39f5SMisono, Tomohiro if (data) { 1654a65001e8SAl Viro error = security_sb_eat_lsm_opts(data, &new_sec_opts); 165572fa39f5SMisono, Tomohiro if (error) 165672fa39f5SMisono, Tomohiro return ERR_PTR(error); 165772fa39f5SMisono, Tomohiro } 165872fa39f5SMisono, Tomohiro 165972fa39f5SMisono, Tomohiro /* 166072fa39f5SMisono, Tomohiro * Setup a dummy root and fs_info for test/set super. This is because 166172fa39f5SMisono, Tomohiro * we don't actually fill this stuff out until open_ctree, but we need 16628260edbaSJosef Bacik * then open_ctree will properly initialize the file system specific 16638260edbaSJosef Bacik * settings later. btrfs_init_fs_info initializes the static elements 16648260edbaSJosef Bacik * of the fs_info (locks and such) to make cleanup easier if we find a 16658260edbaSJosef Bacik * superblock with our given fs_devices later on at sget() time. 166672fa39f5SMisono, Tomohiro */ 1667a8fd1f71SJeff Mahoney fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 166872fa39f5SMisono, Tomohiro if (!fs_info) { 166972fa39f5SMisono, Tomohiro error = -ENOMEM; 167072fa39f5SMisono, Tomohiro goto error_sec_opts; 167172fa39f5SMisono, Tomohiro } 16728260edbaSJosef Bacik btrfs_init_fs_info(fs_info); 167372fa39f5SMisono, Tomohiro 167472fa39f5SMisono, Tomohiro fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 167572fa39f5SMisono, Tomohiro fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 167672fa39f5SMisono, Tomohiro if (!fs_info->super_copy || !fs_info->super_for_commit) { 167772fa39f5SMisono, Tomohiro error = -ENOMEM; 167872fa39f5SMisono, Tomohiro goto error_fs_info; 167972fa39f5SMisono, Tomohiro } 168072fa39f5SMisono, Tomohiro 1681f5194e34SDavid Sterba mutex_lock(&uuid_mutex); 1682fa59f27cSAnand Jain error = btrfs_parse_device_options(data, mode, fs_type); 168381ffd56bSDavid Sterba if (error) { 1684399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 1685399f7f4cSDavid Sterba goto error_fs_info; 168681ffd56bSDavid Sterba } 1687399f7f4cSDavid Sterba 168836350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, mode, fs_type); 168936350e95SGu Jinxiang if (IS_ERR(device)) { 1690399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 169136350e95SGu Jinxiang error = PTR_ERR(device); 1692399f7f4cSDavid Sterba goto error_fs_info; 169381ffd56bSDavid Sterba } 1694399f7f4cSDavid Sterba 169536350e95SGu Jinxiang fs_devices = device->fs_devices; 1696399f7f4cSDavid Sterba fs_info->fs_devices = fs_devices; 1697399f7f4cSDavid Sterba 169872fa39f5SMisono, Tomohiro error = btrfs_open_devices(fs_devices, mode, fs_type); 1699f5194e34SDavid Sterba mutex_unlock(&uuid_mutex); 170072fa39f5SMisono, Tomohiro if (error) 170172fa39f5SMisono, Tomohiro goto error_fs_info; 170272fa39f5SMisono, Tomohiro 170372fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 170472fa39f5SMisono, Tomohiro error = -EACCES; 170572fa39f5SMisono, Tomohiro goto error_close_devices; 170672fa39f5SMisono, Tomohiro } 170772fa39f5SMisono, Tomohiro 170872fa39f5SMisono, Tomohiro bdev = fs_devices->latest_bdev; 170972fa39f5SMisono, Tomohiro s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 171072fa39f5SMisono, Tomohiro fs_info); 171172fa39f5SMisono, Tomohiro if (IS_ERR(s)) { 171272fa39f5SMisono, Tomohiro error = PTR_ERR(s); 171372fa39f5SMisono, Tomohiro goto error_close_devices; 171472fa39f5SMisono, Tomohiro } 171572fa39f5SMisono, Tomohiro 171672fa39f5SMisono, Tomohiro if (s->s_root) { 171772fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 17180d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 171972fa39f5SMisono, Tomohiro if ((flags ^ s->s_flags) & SB_RDONLY) 172072fa39f5SMisono, Tomohiro error = -EBUSY; 172172fa39f5SMisono, Tomohiro } else { 172272fa39f5SMisono, Tomohiro snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 172372fa39f5SMisono, Tomohiro btrfs_sb(s)->bdev_holder = fs_type; 17249b4e675aSDavid Sterba if (!strstr(crc32c_impl(), "generic")) 17259b4e675aSDavid Sterba set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); 172672fa39f5SMisono, Tomohiro error = btrfs_fill_super(s, fs_devices, data); 172772fa39f5SMisono, Tomohiro } 1728a65001e8SAl Viro if (!error) 1729204cc0ccSAl Viro error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL); 1730a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 173172fa39f5SMisono, Tomohiro if (error) { 173272fa39f5SMisono, Tomohiro deactivate_locked_super(s); 1733a65001e8SAl Viro return ERR_PTR(error); 173472fa39f5SMisono, Tomohiro } 173572fa39f5SMisono, Tomohiro 173672fa39f5SMisono, Tomohiro return dget(s->s_root); 173772fa39f5SMisono, Tomohiro 173872fa39f5SMisono, Tomohiro error_close_devices: 173972fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 174072fa39f5SMisono, Tomohiro error_fs_info: 17410d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 174272fa39f5SMisono, Tomohiro error_sec_opts: 174372fa39f5SMisono, Tomohiro security_free_mnt_opts(&new_sec_opts); 174472fa39f5SMisono, Tomohiro return ERR_PTR(error); 174572fa39f5SMisono, Tomohiro } 1746312c89fbSMisono, Tomohiro 1747edf24abeSChristoph Hellwig /* 1748312c89fbSMisono, Tomohiro * Mount function which is called by VFS layer. 1749edf24abeSChristoph Hellwig * 1750312c89fbSMisono, Tomohiro * In order to allow mounting a subvolume directly, btrfs uses mount_subtree() 1751312c89fbSMisono, Tomohiro * which needs vfsmount* of device's root (/). This means device's root has to 1752312c89fbSMisono, Tomohiro * be mounted internally in any case. 1753312c89fbSMisono, Tomohiro * 1754312c89fbSMisono, Tomohiro * Operation flow: 1755312c89fbSMisono, Tomohiro * 1. Parse subvol id related options for later use in mount_subvol(). 1756312c89fbSMisono, Tomohiro * 1757312c89fbSMisono, Tomohiro * 2. Mount device's root (/) by calling vfs_kern_mount(). 1758312c89fbSMisono, Tomohiro * 1759312c89fbSMisono, Tomohiro * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the 1760312c89fbSMisono, Tomohiro * first place. In order to avoid calling btrfs_mount() again, we use 1761312c89fbSMisono, Tomohiro * different file_system_type which is not registered to VFS by 1762312c89fbSMisono, Tomohiro * register_filesystem() (btrfs_root_fs_type). As a result, 1763312c89fbSMisono, Tomohiro * btrfs_mount_root() is called. The return value will be used by 1764312c89fbSMisono, Tomohiro * mount_subtree() in mount_subvol(). 1765312c89fbSMisono, Tomohiro * 1766312c89fbSMisono, Tomohiro * 3. Call mount_subvol() to get the dentry of subvolume. Since there is 1767312c89fbSMisono, Tomohiro * "btrfs subvolume set-default", mount_subvol() is called always. 1768edf24abeSChristoph Hellwig */ 1769061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1770306e16ceSDavid Sterba const char *device_name, void *data) 17714b82d6e4SYan { 1772312c89fbSMisono, Tomohiro struct vfsmount *mnt_root; 1773312c89fbSMisono, Tomohiro struct dentry *root; 177473f73415SJosef Bacik char *subvol_name = NULL; 177573f73415SJosef Bacik u64 subvol_objectid = 0; 17764b82d6e4SYan int error = 0; 17774b82d6e4SYan 177893b9bcdfSGu Jinxiang error = btrfs_parse_subvol_options(data, &subvol_name, 177993b9bcdfSGu Jinxiang &subvol_objectid); 1780f23c8af8SIlya Dryomov if (error) { 1781f23c8af8SIlya Dryomov kfree(subvol_name); 1782061dbc6bSAl Viro return ERR_PTR(error); 1783f23c8af8SIlya Dryomov } 1784edf24abeSChristoph Hellwig 1785312c89fbSMisono, Tomohiro /* mount device's root (/) */ 1786312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); 1787312c89fbSMisono, Tomohiro if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { 1788312c89fbSMisono, Tomohiro if (flags & SB_RDONLY) { 1789312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1790312c89fbSMisono, Tomohiro flags & ~SB_RDONLY, device_name, data); 17914b82d6e4SYan } else { 1792312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1793312c89fbSMisono, Tomohiro flags | SB_RDONLY, device_name, data); 1794312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1795312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1796532b618bSEric W. Biederman kfree(subvol_name); 1797312c89fbSMisono, Tomohiro goto out; 1798f667aef6SQu Wenruo } 1799f667aef6SQu Wenruo 1800312c89fbSMisono, Tomohiro down_write(&mnt_root->mnt_sb->s_umount); 1801312c89fbSMisono, Tomohiro error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); 1802312c89fbSMisono, Tomohiro up_write(&mnt_root->mnt_sb->s_umount); 1803312c89fbSMisono, Tomohiro if (error < 0) { 1804312c89fbSMisono, Tomohiro root = ERR_PTR(error); 1805312c89fbSMisono, Tomohiro mntput(mnt_root); 1806532b618bSEric W. Biederman kfree(subvol_name); 1807312c89fbSMisono, Tomohiro goto out; 1808312c89fbSMisono, Tomohiro } 1809312c89fbSMisono, Tomohiro } 1810312c89fbSMisono, Tomohiro } 1811312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1812312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1813532b618bSEric W. Biederman kfree(subvol_name); 1814312c89fbSMisono, Tomohiro goto out; 1815f667aef6SQu Wenruo } 18164b82d6e4SYan 1817312c89fbSMisono, Tomohiro /* mount_subvol() will free subvol_name and mnt_root */ 1818ae0bc863SAnand Jain root = mount_subvol(subvol_name, subvol_objectid, mnt_root); 18194b82d6e4SYan 1820312c89fbSMisono, Tomohiro out: 1821312c89fbSMisono, Tomohiro return root; 18224b82d6e4SYan } 18232e635a27SChris Mason 18240d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 1825f7b885beSAnand Jain u32 new_pool_size, u32 old_pool_size) 18260d2450abSSergei Trofimovich { 18270d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 18280d2450abSSergei Trofimovich return; 18290d2450abSSergei Trofimovich 18300d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 18310d2450abSSergei Trofimovich 1832efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 18330d2450abSSergei Trofimovich old_pool_size, new_pool_size); 18340d2450abSSergei Trofimovich 18355cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1836afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1837e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1838fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1839fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1840fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1841fccb5d86SQu Wenruo new_pool_size); 1842fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1843fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 18445b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1845736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 18460339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1847ff023aacSStefan Behrens new_pool_size); 18480d2450abSSergei Trofimovich } 18490d2450abSSergei Trofimovich 1850f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1851f42a34b2SMiao Xie unsigned long old_opts, int flags) 1852f42a34b2SMiao Xie { 1853dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1854dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 18551751e8a6SLinus Torvalds (flags & SB_RDONLY))) { 1856dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1857dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1858dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 18591751e8a6SLinus Torvalds if (flags & SB_RDONLY) 1860dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1861dc81cdc5SMiao Xie } 1862dc81cdc5SMiao Xie } 1863dc81cdc5SMiao Xie 1864dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1865dc81cdc5SMiao Xie unsigned long old_opts) 1866dc81cdc5SMiao Xie { 1867dc81cdc5SMiao Xie /* 1868180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1869180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1870dc81cdc5SMiao Xie */ 1871dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1872bc98a42cSDavid Howells (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { 1873dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1874dc81cdc5SMiao Xie } 1875dc81cdc5SMiao Xie 1876b0643e59SDennis Zhou /* If we toggled discard async */ 1877b0643e59SDennis Zhou if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && 1878b0643e59SDennis Zhou btrfs_test_opt(fs_info, DISCARD_ASYNC)) 1879b0643e59SDennis Zhou btrfs_discard_resume(fs_info); 1880b0643e59SDennis Zhou else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && 1881b0643e59SDennis Zhou !btrfs_test_opt(fs_info, DISCARD_ASYNC)) 1882b0643e59SDennis Zhou btrfs_discard_cleanup(fs_info); 1883dc81cdc5SMiao Xie } 1884dc81cdc5SMiao Xie 1885c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1886c146afadSYan Zheng { 1887815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 188849b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 188949b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 189049b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 189149b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 1892f7b885beSAnand Jain u32 old_thread_pool_size = fs_info->thread_pool_size; 1893d612ac59SAnand Jain u32 old_metadata_ratio = fs_info->metadata_ratio; 1894c146afadSYan Zheng int ret; 1895c146afadSYan Zheng 189602b9984dSTheodore Ts'o sync_filesystem(sb); 189788c4703fSJohannes Thumshirn set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1898dc81cdc5SMiao Xie 1899f667aef6SQu Wenruo if (data) { 1900204cc0ccSAl Viro void *new_sec_opts = NULL; 1901f667aef6SQu Wenruo 1902a65001e8SAl Viro ret = security_sb_eat_lsm_opts(data, &new_sec_opts); 1903a65001e8SAl Viro if (!ret) 1904204cc0ccSAl Viro ret = security_sb_remount(sb, new_sec_opts); 1905a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 1906f667aef6SQu Wenruo if (ret) 1907f667aef6SQu Wenruo goto restore; 1908f667aef6SQu Wenruo } 1909f667aef6SQu Wenruo 19102ff7e61eSJeff Mahoney ret = btrfs_parse_options(fs_info, data, *flags); 1911891f41cbSChengguang Xu if (ret) 191249b25e05SJeff Mahoney goto restore; 1913b288052eSChris Mason 1914f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 19150d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 19160d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 19170d2450abSSergei Trofimovich 19181751e8a6SLinus Torvalds if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1919dc81cdc5SMiao Xie goto out; 1920c146afadSYan Zheng 19211751e8a6SLinus Torvalds if (*flags & SB_RDONLY) { 19228dabb742SStefan Behrens /* 19238dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 19248dabb742SStefan Behrens * the filesystem is busy. 19258dabb742SStefan Behrens */ 192621c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 192757056740SJosef Bacik cancel_work_sync(&fs_info->async_data_reclaim_work); 1928361c093dSStefan Behrens 1929b0643e59SDennis Zhou btrfs_discard_cleanup(fs_info); 1930b0643e59SDennis Zhou 1931361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1932361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1933361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1934361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1935361c093dSStefan Behrens 19361751e8a6SLinus Torvalds sb->s_flags |= SB_RDONLY; 1937c146afadSYan Zheng 1938e44163e1SJeff Mahoney /* 19391751e8a6SLinus Torvalds * Setting SB_RDONLY will put the cleaner thread to 1940e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1941e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1942e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1943e44163e1SJeff Mahoney * unless we clean them up here. 1944e44163e1SJeff Mahoney */ 1945e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1946e44163e1SJeff Mahoney 19478dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 19488dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1949061594efSMiao Xie btrfs_pause_balance(fs_info); 19508dabb742SStefan Behrens 19516bccf3abSJeff Mahoney ret = btrfs_commit_super(fs_info); 195249b25e05SJeff Mahoney if (ret) 195349b25e05SJeff Mahoney goto restore; 1954c146afadSYan Zheng } else { 19550b246afaSJeff Mahoney if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 19566ef3de9cSDavid Sterba btrfs_err(fs_info, 1957efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 19586ef3de9cSDavid Sterba ret = -EINVAL; 19596ef3de9cSDavid Sterba goto restore; 19606ef3de9cSDavid Sterba } 19618a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 196249b25e05SJeff Mahoney ret = -EACCES; 196349b25e05SJeff Mahoney goto restore; 19648a3db184SSergei Trofimovich } 19652b82032cSYan Zheng 19666528b99dSAnand Jain if (!btrfs_check_rw_degradable(fs_info, NULL)) { 1967efe120a0SFrank Holton btrfs_warn(fs_info, 196852042d8eSAndrea Gelmini "too many missing devices, writable remount is not allowed"); 1969292fd7fcSStefan Behrens ret = -EACCES; 1970292fd7fcSStefan Behrens goto restore; 1971292fd7fcSStefan Behrens } 1972292fd7fcSStefan Behrens 19738a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 197410a3a3edSDavid Sterba btrfs_warn(fs_info, 197510a3a3edSDavid Sterba "mount required to replay tree-log, cannot remount read-write"); 197649b25e05SJeff Mahoney ret = -EINVAL; 197749b25e05SJeff Mahoney goto restore; 19788a3db184SSergei Trofimovich } 1979c146afadSYan Zheng 198044c0ca21SBoris Burkov /* 198144c0ca21SBoris Burkov * NOTE: when remounting with a change that does writes, don't 198244c0ca21SBoris Burkov * put it anywhere above this point, as we are not sure to be 198344c0ca21SBoris Burkov * safe to write until we pass the above checks. 198444c0ca21SBoris Burkov */ 198544c0ca21SBoris Burkov ret = btrfs_start_pre_rw_mount(fs_info); 198649b25e05SJeff Mahoney if (ret) 198749b25e05SJeff Mahoney goto restore; 1988c146afadSYan Zheng 19891751e8a6SLinus Torvalds sb->s_flags &= ~SB_RDONLY; 199090c711abSZygo Blaxell 1991afcdd129SJosef Bacik set_bit(BTRFS_FS_OPEN, &fs_info->flags); 1992c146afadSYan Zheng } 1993dc81cdc5SMiao Xie out: 1994faa00889SJosef Bacik /* 1995faa00889SJosef Bacik * We need to set SB_I_VERSION here otherwise it'll get cleared by VFS, 1996faa00889SJosef Bacik * since the absence of the flag means it can be toggled off by remount. 1997faa00889SJosef Bacik */ 1998faa00889SJosef Bacik *flags |= SB_I_VERSION; 1999faa00889SJosef Bacik 20002c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 2001dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 2002*8cd29088SBoris Burkov btrfs_clear_oneshot_options(fs_info); 200388c4703fSJohannes Thumshirn clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 200488c4703fSJohannes Thumshirn 2005c146afadSYan Zheng return 0; 200649b25e05SJeff Mahoney 200749b25e05SJeff Mahoney restore: 20081751e8a6SLinus Torvalds /* We've hit an error - don't reset SB_RDONLY */ 2009bc98a42cSDavid Howells if (sb_rdonly(sb)) 20101751e8a6SLinus Torvalds old_flags |= SB_RDONLY; 201149b25e05SJeff Mahoney sb->s_flags = old_flags; 201249b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 201349b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 201449b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 20150d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 20160d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 201749b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 2018dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 201988c4703fSJohannes Thumshirn clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 202088c4703fSJohannes Thumshirn 202149b25e05SJeff Mahoney return ret; 2022c146afadSYan Zheng } 2023c146afadSYan Zheng 2024bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 20257e17916bSArnd Bergmann static inline int btrfs_cmp_device_free_bytes(const void *dev_info1, 2026bcd53741SArne Jansen const void *dev_info2) 2027bcd53741SArne Jansen { 2028bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 2029bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 2030bcd53741SArne Jansen return -1; 2031bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 2032bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 2033bcd53741SArne Jansen return 1; 2034bcd53741SArne Jansen else 2035bcd53741SArne Jansen return 0; 2036bcd53741SArne Jansen } 2037bcd53741SArne Jansen 2038bcd53741SArne Jansen /* 2039bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 2040bcd53741SArne Jansen * is stored.(Descending Sort) 2041bcd53741SArne Jansen */ 2042bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 2043bcd53741SArne Jansen struct btrfs_device_info *devices, 2044bcd53741SArne Jansen size_t nr_devices) 2045bcd53741SArne Jansen { 2046bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 2047bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 2048bcd53741SArne Jansen } 2049bcd53741SArne Jansen 20506d07bcecSMiao Xie /* 20516d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 20526d07bcecSMiao Xie * file data. 20536d07bcecSMiao Xie */ 20547e17916bSArnd Bergmann static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, 20556bccf3abSJeff Mahoney u64 *free_bytes) 20566d07bcecSMiao Xie { 20576d07bcecSMiao Xie struct btrfs_device_info *devices_info; 20586d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 20596d07bcecSMiao Xie struct btrfs_device *device; 20606d07bcecSMiao Xie u64 type; 20616d07bcecSMiao Xie u64 avail_space; 20626d07bcecSMiao Xie u64 min_stripe_size; 2063559ca6eaSNikolay Borisov int num_stripes = 1; 20646d07bcecSMiao Xie int i = 0, nr_devices; 20654f080f57SDavid Sterba const struct btrfs_raid_attr *rattr; 20666d07bcecSMiao Xie 20677e33fd99SJosef Bacik /* 206801327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 20697e33fd99SJosef Bacik * enough for our purposes. 20707e33fd99SJosef Bacik */ 2071b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 20727e33fd99SJosef Bacik if (!nr_devices) { 20737e33fd99SJosef Bacik smp_mb(); 20747e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 20757e33fd99SJosef Bacik ASSERT(nr_devices); 20767e33fd99SJosef Bacik if (!nr_devices) { 20777e33fd99SJosef Bacik *free_bytes = 0; 20787e33fd99SJosef Bacik return 0; 20797e33fd99SJosef Bacik } 20807e33fd99SJosef Bacik } 20816d07bcecSMiao Xie 2082d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 20836a44517dSDavid Sterba GFP_KERNEL); 20846d07bcecSMiao Xie if (!devices_info) 20856d07bcecSMiao Xie return -ENOMEM; 20866d07bcecSMiao Xie 208701327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 20881b86826dSJeff Mahoney type = btrfs_data_alloc_profile(fs_info); 20894f080f57SDavid Sterba rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)]; 20904f080f57SDavid Sterba 2091e1ea2beeSDavid Sterba if (type & BTRFS_BLOCK_GROUP_RAID0) 209239fb26c3SMiao Xie num_stripes = nr_devices; 2093e1ea2beeSDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1) 209439fb26c3SMiao Xie num_stripes = 2; 209547e6f742SDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1C3) 209647e6f742SDavid Sterba num_stripes = 3; 20978d6fac00SDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1C4) 20988d6fac00SDavid Sterba num_stripes = 4; 2099e1ea2beeSDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID10) 210039fb26c3SMiao Xie num_stripes = 4; 21016d07bcecSMiao Xie 21024f080f57SDavid Sterba /* Adjust for more than 1 stripe per device */ 21034f080f57SDavid Sterba min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN; 21046d07bcecSMiao Xie 21057e33fd99SJosef Bacik rcu_read_lock(); 21067e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2107e12c9621SAnand Jain if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 2108e12c9621SAnand Jain &device->dev_state) || 2109401e29c1SAnand Jain !device->bdev || 2110401e29c1SAnand Jain test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) 21116d07bcecSMiao Xie continue; 21126d07bcecSMiao Xie 21137e33fd99SJosef Bacik if (i >= nr_devices) 21147e33fd99SJosef Bacik break; 21157e33fd99SJosef Bacik 21166d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 21176d07bcecSMiao Xie 21186d07bcecSMiao Xie /* align with stripe_len */ 2119559ca6eaSNikolay Borisov avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN); 21206d07bcecSMiao Xie 21216d07bcecSMiao Xie /* 212201327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 21236d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 21246d07bcecSMiao Xie * allocation. 2125559ca6eaSNikolay Borisov * 2126559ca6eaSNikolay Borisov * This ensures we have at least min_stripe_size free space 2127559ca6eaSNikolay Borisov * after excluding 1MB. 21286d07bcecSMiao Xie */ 2129559ca6eaSNikolay Borisov if (avail_space <= SZ_1M + min_stripe_size) 21306d07bcecSMiao Xie continue; 21316d07bcecSMiao Xie 2132559ca6eaSNikolay Borisov avail_space -= SZ_1M; 2133559ca6eaSNikolay Borisov 21346d07bcecSMiao Xie devices_info[i].dev = device; 21356d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 21366d07bcecSMiao Xie 21376d07bcecSMiao Xie i++; 21386d07bcecSMiao Xie } 21397e33fd99SJosef Bacik rcu_read_unlock(); 21406d07bcecSMiao Xie 21416d07bcecSMiao Xie nr_devices = i; 21426d07bcecSMiao Xie 21436d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 21446d07bcecSMiao Xie 21456d07bcecSMiao Xie i = nr_devices - 1; 21466d07bcecSMiao Xie avail_space = 0; 2147559ca6eaSNikolay Borisov while (nr_devices >= rattr->devs_min) { 2148559ca6eaSNikolay Borisov num_stripes = min(num_stripes, nr_devices); 214939fb26c3SMiao Xie 21506d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 21516d07bcecSMiao Xie int j; 21526d07bcecSMiao Xie u64 alloc_size; 21536d07bcecSMiao Xie 215439fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 21556d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 215639fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 21576d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 21586d07bcecSMiao Xie } 21596d07bcecSMiao Xie i--; 21606d07bcecSMiao Xie nr_devices--; 21616d07bcecSMiao Xie } 21626d07bcecSMiao Xie 21636d07bcecSMiao Xie kfree(devices_info); 21646d07bcecSMiao Xie *free_bytes = avail_space; 21656d07bcecSMiao Xie return 0; 21666d07bcecSMiao Xie } 21676d07bcecSMiao Xie 2168ba7b6e62SDavid Sterba /* 2169ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2170ba7b6e62SDavid Sterba * 2171ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2172ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2173ba7b6e62SDavid Sterba * 2174ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 21750d0c71b3SDavid Sterba * algorithm that respects the device sizes and order of allocations. This is 21760d0c71b3SDavid Sterba * a close approximation of the actual use but there are other factors that may 21770d0c71b3SDavid Sterba * change the result (like a new metadata chunk). 2178ba7b6e62SDavid Sterba * 2179ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2180ba7b6e62SDavid Sterba */ 21818fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 21828fd17795SChris Mason { 2183815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2184815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2185bd4d1088SJosef Bacik struct btrfs_space_info *found; 2186bd4d1088SJosef Bacik u64 total_used = 0; 21876d07bcecSMiao Xie u64 total_free_data = 0; 2188ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2189265fdfa6SDavid Sterba u32 bits = fs_info->sectorsize_bits; 2190de37aa51SNikolay Borisov __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid; 2191ba7b6e62SDavid Sterba unsigned factor = 1; 2192ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 21936d07bcecSMiao Xie int ret; 2194ca8a51b3SDavid Sterba u64 thresh = 0; 2195ae02d1bdSLuis de Bethencourt int mixed = 0; 21968fd17795SChris Mason 219772804905SJosef Bacik list_for_each_entry(found, &fs_info->space_info, list) { 21986d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2199ba7b6e62SDavid Sterba int i; 2200ba7b6e62SDavid Sterba 22016d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 22026d07bcecSMiao Xie total_free_data -= 22036d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2204ba7b6e62SDavid Sterba 2205ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 220646df06b8SDavid Sterba if (!list_empty(&found->block_groups[i])) 220746df06b8SDavid Sterba factor = btrfs_bg_type_to_factor( 220846df06b8SDavid Sterba btrfs_raid_array[i].bg_flag); 2209ba7b6e62SDavid Sterba } 22106d07bcecSMiao Xie } 2211ae02d1bdSLuis de Bethencourt 2212ae02d1bdSLuis de Bethencourt /* 2213ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2214ae02d1bdSLuis de Bethencourt */ 2215ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2216ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2217ae02d1bdSLuis de Bethencourt mixed = 1; 2218ae02d1bdSLuis de Bethencourt else 2219ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2220ae02d1bdSLuis de Bethencourt found->disk_used; 2221ae02d1bdSLuis de Bethencourt } 22226d07bcecSMiao Xie 2223b742bb82SYan, Zheng total_used += found->disk_used; 222489a55897SJosef Bacik } 2225ba7b6e62SDavid Sterba 2226ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2227ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2228ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2229ba7b6e62SDavid Sterba 2230ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2231ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 223241b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 223341b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2234ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 223541b34accSLuis de Bethencourt else 223641b34accSLuis de Bethencourt buf->f_bfree = 0; 2237ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2238ba7b6e62SDavid Sterba 22390d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 22406bccf3abSJeff Mahoney ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); 22417e33fd99SJosef Bacik if (ret) 22426d07bcecSMiao Xie return ret; 2243ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 22446d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2245d397712bSChris Mason 2246ca8a51b3SDavid Sterba /* 2247ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2248ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2249ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2250ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2251ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2252ca8a51b3SDavid Sterba * 2253ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2254ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2255ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2256ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2257ca8a51b3SDavid Sterba * way around. 2258ca8a51b3SDavid Sterba */ 2259d4417e22SNikolay Borisov thresh = SZ_4M; 2260ca8a51b3SDavid Sterba 2261d55966c4SJosef Bacik /* 2262d55966c4SJosef Bacik * We only want to claim there's no available space if we can no longer 2263d55966c4SJosef Bacik * allocate chunks for our metadata profile and our global reserve will 2264d55966c4SJosef Bacik * not fit in the free metadata space. If we aren't ->full then we 2265d55966c4SJosef Bacik * still can allocate chunks and thus are fine using the currently 2266d55966c4SJosef Bacik * calculated f_bavail. 2267d55966c4SJosef Bacik */ 2268d55966c4SJosef Bacik if (!mixed && block_rsv->space_info->full && 2269d55966c4SJosef Bacik total_free_meta - thresh < block_rsv->size) 2270ca8a51b3SDavid Sterba buf->f_bavail = 0; 2271ca8a51b3SDavid Sterba 2272ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2273ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2274ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2275ba7b6e62SDavid Sterba 22769d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 22779d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 22789d03632eSDavid Woodhouse on a big-endian or little-endian host */ 22799d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 22809d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 228132d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 22824fd786e6SMisono Tomohiro buf->f_fsid.val[0] ^= 22834fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32; 22844fd786e6SMisono Tomohiro buf->f_fsid.val[1] ^= 22854fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid; 228632d48fa1SDavid Woodhouse 22878fd17795SChris Mason return 0; 22888fd17795SChris Mason } 2289b5133862SChris Mason 2290aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2291aea52e19SAl Viro { 2292815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2293aea52e19SAl Viro kill_anon_super(sb); 22940d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 2295aea52e19SAl Viro } 2296aea52e19SAl Viro 22972e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 22982e635a27SChris Mason .owner = THIS_MODULE, 22992e635a27SChris Mason .name = "btrfs", 2300061dbc6bSAl Viro .mount = btrfs_mount, 2301aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2302f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 23032e635a27SChris Mason }; 230472fa39f5SMisono, Tomohiro 230572fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type = { 230672fa39f5SMisono, Tomohiro .owner = THIS_MODULE, 230772fa39f5SMisono, Tomohiro .name = "btrfs", 230872fa39f5SMisono, Tomohiro .mount = btrfs_mount_root, 230972fa39f5SMisono, Tomohiro .kill_sb = btrfs_kill_super, 231072fa39f5SMisono, Tomohiro .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 231172fa39f5SMisono, Tomohiro }; 231272fa39f5SMisono, Tomohiro 23137f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2314a9218f6bSChris Mason 2315d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2316d8620958STom Van Braeckel { 2317d8620958STom Van Braeckel /* 2318d8620958STom Van Braeckel * The control file's private_data is used to hold the 2319d8620958STom Van Braeckel * transaction when it is started and is used to keep 2320d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2321d8620958STom Van Braeckel */ 2322d8620958STom Van Braeckel file->private_data = NULL; 2323d8620958STom Van Braeckel return 0; 2324d8620958STom Van Braeckel } 2325d8620958STom Van Braeckel 2326d352ac68SChris Mason /* 2327cfe953c8SSu Yue * Used by /dev/btrfs-control for devices ioctls. 2328d352ac68SChris Mason */ 23298a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 23308a4b83ccSChris Mason unsigned long arg) 23318a4b83ccSChris Mason { 23328a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 233336350e95SGu Jinxiang struct btrfs_device *device = NULL; 2334c071fcfdSChris Mason int ret = -ENOTTY; 23358a4b83ccSChris Mason 2336e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2337e441d54dSChris Mason return -EPERM; 2338e441d54dSChris Mason 2339dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2340dae7b665SLi Zefan if (IS_ERR(vol)) 2341dae7b665SLi Zefan return PTR_ERR(vol); 2342f505754fSFilipe Manana vol->name[BTRFS_PATH_NAME_MAX] = '\0'; 2343c071fcfdSChris Mason 23448a4b83ccSChris Mason switch (cmd) { 23458a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 2346899f9307SDavid Sterba mutex_lock(&uuid_mutex); 234736350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 234836350e95SGu Jinxiang &btrfs_root_fs_type); 234936350e95SGu Jinxiang ret = PTR_ERR_OR_ZERO(device); 2350899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 23518a4b83ccSChris Mason break; 2352228a73abSAnand Jain case BTRFS_IOC_FORGET_DEV: 2353228a73abSAnand Jain ret = btrfs_forget_devices(vol->name); 2354228a73abSAnand Jain break; 235502db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 2356899f9307SDavid Sterba mutex_lock(&uuid_mutex); 235736350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 235836350e95SGu Jinxiang &btrfs_root_fs_type); 235936350e95SGu Jinxiang if (IS_ERR(device)) { 2360899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 236136350e95SGu Jinxiang ret = PTR_ERR(device); 236202db0844SJosef Bacik break; 2363899f9307SDavid Sterba } 236436350e95SGu Jinxiang ret = !(device->fs_devices->num_devices == 236536350e95SGu Jinxiang device->fs_devices->total_devices); 2366899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 236702db0844SJosef Bacik break; 2368c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2369d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2370c5868f83SDavid Sterba break; 23718a4b83ccSChris Mason } 2372dae7b665SLi Zefan 23738a4b83ccSChris Mason kfree(vol); 2374f819d837SLinda Knippers return ret; 23758a4b83ccSChris Mason } 23768a4b83ccSChris Mason 23770176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2378ed0dab6bSYan { 2379354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 23800b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 23810b246afaSJeff Mahoney struct btrfs_root *root = fs_info->tree_root; 2382354aa0fbSMiao Xie 2383fac03c8dSDavid Sterba set_bit(BTRFS_FS_FROZEN, &fs_info->flags); 23849e7cc91aSWang Xiaoguang /* 23859e7cc91aSWang Xiaoguang * We don't need a barrier here, we'll wait for any transaction that 23869e7cc91aSWang Xiaoguang * could be in progress on other threads (and do delayed iputs that 23879e7cc91aSWang Xiaoguang * we want to avoid on a frozen filesystem), or do the commit 23889e7cc91aSWang Xiaoguang * ourselves. 23899e7cc91aSWang Xiaoguang */ 2390d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2391354aa0fbSMiao Xie if (IS_ERR(trans)) { 2392354aa0fbSMiao Xie /* no transaction, don't bother */ 2393354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 23940176260fSLinus Torvalds return 0; 2395354aa0fbSMiao Xie return PTR_ERR(trans); 2396354aa0fbSMiao Xie } 23973a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 2398ed0dab6bSYan } 2399ed0dab6bSYan 24009e7cc91aSWang Xiaoguang static int btrfs_unfreeze(struct super_block *sb) 24019e7cc91aSWang Xiaoguang { 2402fac03c8dSDavid Sterba struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2403fac03c8dSDavid Sterba 2404fac03c8dSDavid Sterba clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); 24059e7cc91aSWang Xiaoguang return 0; 24069e7cc91aSWang Xiaoguang } 24079e7cc91aSWang Xiaoguang 24089c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 24099c5085c1SJosef Bacik { 24109c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 24119c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 24129c5085c1SJosef Bacik 241388c14590SDavid Sterba /* 241488c14590SDavid Sterba * Lightweight locking of the devices. We should not need 241588c14590SDavid Sterba * device_list_mutex here as we only read the device data and the list 241688c14590SDavid Sterba * is protected by RCU. Even if a device is deleted during the list 241788c14590SDavid Sterba * traversals, we'll get valid data, the freeing callback will wait at 241852042d8eSAndrea Gelmini * least until the rcu_read_unlock. 241988c14590SDavid Sterba */ 242088c14590SDavid Sterba rcu_read_lock(); 24214faf55b0SAnand Jain list_for_each_entry_rcu(dev, &fs_info->fs_devices->devices, dev_list) { 2422e6e674bdSAnand Jain if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) 2423aa9ddcd4SJosef Bacik continue; 24240aeb8a6eSAnand Jain if (!dev->name) 24250aeb8a6eSAnand Jain continue; 24269c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 24279c5085c1SJosef Bacik first_dev = dev; 24289c5085c1SJosef Bacik } 24299c5085c1SJosef Bacik 2430672d5990SMisono Tomohiro if (first_dev) 2431672d5990SMisono Tomohiro seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\"); 2432672d5990SMisono Tomohiro else 24339c5085c1SJosef Bacik WARN_ON(1); 243488c14590SDavid Sterba rcu_read_unlock(); 24359c5085c1SJosef Bacik return 0; 24369c5085c1SJosef Bacik } 24379c5085c1SJosef Bacik 2438b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 243976dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2440bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2441e20d96d6SChris Mason .put_super = btrfs_put_super, 2442d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2443a9572a15SEric Paris .show_options = btrfs_show_options, 24449c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 24452c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 24462c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 244726602cabSAl Viro .free_inode = btrfs_free_inode, 24488fd17795SChris Mason .statfs = btrfs_statfs, 2449c146afadSYan Zheng .remount_fs = btrfs_remount, 24500176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 24519e7cc91aSWang Xiaoguang .unfreeze_fs = btrfs_unfreeze, 2452e20d96d6SChris Mason }; 2453a9218f6bSChris Mason 2454a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2455d8620958STom Van Braeckel .open = btrfs_control_open, 2456a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 24571832f2d8SArnd Bergmann .compat_ioctl = compat_ptr_ioctl, 2458a9218f6bSChris Mason .owner = THIS_MODULE, 24596038f373SArnd Bergmann .llseek = noop_llseek, 2460a9218f6bSChris Mason }; 2461a9218f6bSChris Mason 2462a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2463578454ffSKay Sievers .minor = BTRFS_MINOR, 2464a9218f6bSChris Mason .name = "btrfs-control", 2465a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2466a9218f6bSChris Mason }; 2467a9218f6bSChris Mason 2468578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2469578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2470578454ffSKay Sievers 2471f5c29bd9SLiu Bo static int __init btrfs_interface_init(void) 2472a9218f6bSChris Mason { 2473a9218f6bSChris Mason return misc_register(&btrfs_misc); 2474a9218f6bSChris Mason } 2475a9218f6bSChris Mason 2476e67c718bSDavid Sterba static __cold void btrfs_interface_exit(void) 2477a9218f6bSChris Mason { 2478f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2479a9218f6bSChris Mason } 2480a9218f6bSChris Mason 2481f5c29bd9SLiu Bo static void __init btrfs_print_mod_info(void) 248285965600SDavid Sterba { 2483edf57cbfSBart Van Assche static const char options[] = "" 248485965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 248585965600SDavid Sterba ", debug=on" 248685965600SDavid Sterba #endif 248779556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 248879556c3dSStefan Behrens ", assert=on" 248979556c3dSStefan Behrens #endif 249085965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 249185965600SDavid Sterba ", integrity-checker=on" 249285965600SDavid Sterba #endif 2493fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2494fb592373SJosef Bacik ", ref-verify=on" 2495fb592373SJosef Bacik #endif 24965b316468SNaohiro Aota #ifdef CONFIG_BLK_DEV_ZONED 24975b316468SNaohiro Aota ", zoned=yes" 24985b316468SNaohiro Aota #else 24995b316468SNaohiro Aota ", zoned=no" 25005b316468SNaohiro Aota #endif 2501edf57cbfSBart Van Assche ; 2502edf57cbfSBart Van Assche pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); 250385965600SDavid Sterba } 250485965600SDavid Sterba 25052e635a27SChris Mason static int __init init_btrfs_fs(void) 25062e635a27SChris Mason { 25072c90e5d6SChris Mason int err; 250858176a96SJosef Bacik 250963541927SFilipe David Borba Manana btrfs_props_init(); 251063541927SFilipe David Borba Manana 251158176a96SJosef Bacik err = btrfs_init_sysfs(); 251258176a96SJosef Bacik if (err) 25139678c543SNikolay Borisov return err; 251458176a96SJosef Bacik 2515143bede5SJeff Mahoney btrfs_init_compress(); 2516d1310b2eSChris Mason 2517261507a0SLi Zefan err = btrfs_init_cachep(); 2518261507a0SLi Zefan if (err) 2519261507a0SLi Zefan goto free_compress; 2520261507a0SLi Zefan 2521d1310b2eSChris Mason err = extent_io_init(); 25222f4cbe64SWyatt Banks if (err) 25232f4cbe64SWyatt Banks goto free_cachep; 25242f4cbe64SWyatt Banks 25256f0d04f8SJosef Bacik err = extent_state_cache_init(); 2526d1310b2eSChris Mason if (err) 2527d1310b2eSChris Mason goto free_extent_io; 2528d1310b2eSChris Mason 25296f0d04f8SJosef Bacik err = extent_map_init(); 25306f0d04f8SJosef Bacik if (err) 25316f0d04f8SJosef Bacik goto free_extent_state_cache; 25326f0d04f8SJosef Bacik 25336352b91dSMiao Xie err = ordered_data_init(); 25342f4cbe64SWyatt Banks if (err) 25352f4cbe64SWyatt Banks goto free_extent_map; 2536c8b97818SChris Mason 25376352b91dSMiao Xie err = btrfs_delayed_inode_init(); 25386352b91dSMiao Xie if (err) 25396352b91dSMiao Xie goto free_ordered_data; 25406352b91dSMiao Xie 25419247f317SMiao Xie err = btrfs_auto_defrag_init(); 254216cdcec7SMiao Xie if (err) 254316cdcec7SMiao Xie goto free_delayed_inode; 254416cdcec7SMiao Xie 254578a6184aSMiao Xie err = btrfs_delayed_ref_init(); 25469247f317SMiao Xie if (err) 25479247f317SMiao Xie goto free_auto_defrag; 25489247f317SMiao Xie 2549b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2550b9e9a6cbSWang Shilong if (err) 2551af13b492SDavid Sterba goto free_delayed_ref; 2552b9e9a6cbSWang Shilong 255397eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 255478a6184aSMiao Xie if (err) 2555af13b492SDavid Sterba goto free_prelim_ref; 255678a6184aSMiao Xie 255797eb6b69SDavid Sterba err = btrfs_interface_init(); 255897eb6b69SDavid Sterba if (err) 255997eb6b69SDavid Sterba goto free_end_io_wq; 256097eb6b69SDavid Sterba 25618ae1af3cSAnand Jain btrfs_print_mod_info(); 2562dc11dd5dSJosef Bacik 2563dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2564dc11dd5dSJosef Bacik if (err) 2565dc11dd5dSJosef Bacik goto unregister_ioctl; 2566dc11dd5dSJosef Bacik 2567dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2568dc11dd5dSJosef Bacik if (err) 2569dc11dd5dSJosef Bacik goto unregister_ioctl; 257074255aa0SJosef Bacik 25712f4cbe64SWyatt Banks return 0; 25722f4cbe64SWyatt Banks 2573a9218f6bSChris Mason unregister_ioctl: 2574a9218f6bSChris Mason btrfs_interface_exit(); 257597eb6b69SDavid Sterba free_end_io_wq: 257697eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2577b9e9a6cbSWang Shilong free_prelim_ref: 2578b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 257978a6184aSMiao Xie free_delayed_ref: 258078a6184aSMiao Xie btrfs_delayed_ref_exit(); 25819247f317SMiao Xie free_auto_defrag: 25829247f317SMiao Xie btrfs_auto_defrag_exit(); 258316cdcec7SMiao Xie free_delayed_inode: 258416cdcec7SMiao Xie btrfs_delayed_inode_exit(); 25856352b91dSMiao Xie free_ordered_data: 25866352b91dSMiao Xie ordered_data_exit(); 25872f4cbe64SWyatt Banks free_extent_map: 25882f4cbe64SWyatt Banks extent_map_exit(); 25896f0d04f8SJosef Bacik free_extent_state_cache: 25906f0d04f8SJosef Bacik extent_state_cache_exit(); 2591d1310b2eSChris Mason free_extent_io: 2592d1310b2eSChris Mason extent_io_exit(); 25932f4cbe64SWyatt Banks free_cachep: 25942f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2595261507a0SLi Zefan free_compress: 2596261507a0SLi Zefan btrfs_exit_compress(); 25972f4cbe64SWyatt Banks btrfs_exit_sysfs(); 25989678c543SNikolay Borisov 25992c90e5d6SChris Mason return err; 26002e635a27SChris Mason } 26012e635a27SChris Mason 26022e635a27SChris Mason static void __exit exit_btrfs_fs(void) 26032e635a27SChris Mason { 260439279cc3SChris Mason btrfs_destroy_cachep(); 260578a6184aSMiao Xie btrfs_delayed_ref_exit(); 26069247f317SMiao Xie btrfs_auto_defrag_exit(); 260716cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2608b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 26096352b91dSMiao Xie ordered_data_exit(); 2610a52d9a80SChris Mason extent_map_exit(); 26116f0d04f8SJosef Bacik extent_state_cache_exit(); 2612d1310b2eSChris Mason extent_io_exit(); 2613a9218f6bSChris Mason btrfs_interface_exit(); 26145ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 26152e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 261658176a96SJosef Bacik btrfs_exit_sysfs(); 26178a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2618261507a0SLi Zefan btrfs_exit_compress(); 26192e635a27SChris Mason } 26202e635a27SChris Mason 262160efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 26222e635a27SChris Mason module_exit(exit_btrfs_fs) 26232e635a27SChris Mason 26242e635a27SChris Mason MODULE_LICENSE("GPL"); 2625d5178578SJohannes Thumshirn MODULE_SOFTDEP("pre: crc32c"); 26263951e7f0SJohannes Thumshirn MODULE_SOFTDEP("pre: xxhash64"); 26273831bf00SJohannes Thumshirn MODULE_SOFTDEP("pre: sha256"); 2628352ae07bSDavid Sterba MODULE_SOFTDEP("pre: blake2b-256"); 2629