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> 2622c44fe6SJosef Bacik #include <linux/ratelimit.h> 279678c543SNikolay Borisov #include <linux/crc32c.h> 2855e301fdSFilipe Brandenburger #include <linux/btrfs.h> 2916cdcec7SMiao Xie #include "delayed-inode.h" 302e635a27SChris Mason #include "ctree.h" 31e20d96d6SChris Mason #include "disk-io.h" 32d5719762SChris Mason #include "transaction.h" 332c90e5d6SChris Mason #include "btrfs_inode.h" 343a686375SChris Mason #include "print-tree.h" 3563541927SFilipe David Borba Manana #include "props.h" 365103e947SJosef Bacik #include "xattr.h" 378a4b83ccSChris Mason #include "volumes.h" 38be6e8dc0SBalaji Rao #include "export.h" 39c8b97818SChris Mason #include "compression.h" 409c5085c1SJosef Bacik #include "rcu-string.h" 418dabb742SStefan Behrens #include "dev-replace.h" 4274255aa0SJosef Bacik #include "free-space-cache.h" 43b9e9a6cbSWang Shilong #include "backref.h" 448719aaaeSJosef Bacik #include "space-info.h" 4589439109SDavid Sterba #include "sysfs.h" 46b70f5097SNaohiro Aota #include "zoned.h" 47dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 48aac0023cSJosef Bacik #include "block-group.h" 49b0643e59SDennis Zhou #include "discard.h" 50d3982100SMark Fasheh #include "qgroup.h" 511abe9b8aSliubo #define CREATE_TRACE_POINTS 521abe9b8aSliubo #include <trace/events/btrfs.h> 531abe9b8aSliubo 54b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 5572fa39f5SMisono, Tomohiro 5672fa39f5SMisono, Tomohiro /* 5772fa39f5SMisono, Tomohiro * Types for mounting the default subvolume and a subvolume explicitly 5872fa39f5SMisono, Tomohiro * requested by subvol=/path. That way the callchain is straightforward and we 5972fa39f5SMisono, Tomohiro * don't have to play tricks with the mount options and recursive calls to 6072fa39f5SMisono, Tomohiro * btrfs_mount. 61312c89fbSMisono, Tomohiro * 62312c89fbSMisono, Tomohiro * The new btrfs_root_fs_type also servers as a tag for the bdev_holder. 6372fa39f5SMisono, Tomohiro */ 64830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 6572fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type; 66e20d96d6SChris Mason 670723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 680723a047SHarald Hoyer 6959131393SJosef Bacik /* 7059131393SJosef Bacik * Generally the error codes correspond to their respective errors, but there 7159131393SJosef Bacik * are a few special cases. 7259131393SJosef Bacik * 7359131393SJosef Bacik * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for 7459131393SJosef Bacik * instance will return EUCLEAN if any of the blocks are corrupted in 7559131393SJosef Bacik * a way that is problematic. We want to reserve EUCLEAN for these 7659131393SJosef Bacik * sort of corruptions. 7759131393SJosef Bacik * 7859131393SJosef Bacik * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we 7959131393SJosef Bacik * need to use EROFS for this case. We will have no idea of the 8059131393SJosef Bacik * original failure, that will have been reported at the time we tripped 8159131393SJosef Bacik * over the error. Each subsequent error that doesn't have any context 8259131393SJosef Bacik * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR. 8359131393SJosef Bacik */ 844143cb8bSDavid Sterba const char * __attribute_const__ btrfs_decode_error(int errno) 85acce952bSliubo { 8608748810SDavid Sterba char *errstr = "unknown"; 87acce952bSliubo 88acce952bSliubo switch (errno) { 89d54f8144SDavid Sterba case -ENOENT: /* -2 */ 90d54f8144SDavid Sterba errstr = "No such entry"; 91d54f8144SDavid Sterba break; 92d54f8144SDavid Sterba case -EIO: /* -5 */ 93acce952bSliubo errstr = "IO failure"; 94acce952bSliubo break; 95d54f8144SDavid Sterba case -ENOMEM: /* -12*/ 96acce952bSliubo errstr = "Out of memory"; 97acce952bSliubo break; 98d54f8144SDavid Sterba case -EEXIST: /* -17 */ 998c342930SJeff Mahoney errstr = "Object already exists"; 1008c342930SJeff Mahoney break; 101d54f8144SDavid Sterba case -ENOSPC: /* -28 */ 10294ef7280SDavid Sterba errstr = "No space left"; 10394ef7280SDavid Sterba break; 104d54f8144SDavid Sterba case -EROFS: /* -30 */ 105d54f8144SDavid Sterba errstr = "Readonly filesystem"; 10694ef7280SDavid Sterba break; 107fb8521caSDavid Sterba case -EOPNOTSUPP: /* -95 */ 108fb8521caSDavid Sterba errstr = "Operation not supported"; 109fb8521caSDavid Sterba break; 110fb8521caSDavid Sterba case -EUCLEAN: /* -117 */ 111fb8521caSDavid Sterba errstr = "Filesystem corrupted"; 112fb8521caSDavid Sterba break; 113fb8521caSDavid Sterba case -EDQUOT: /* -122 */ 114fb8521caSDavid Sterba errstr = "Quota exceeded"; 115fb8521caSDavid Sterba break; 116acce952bSliubo } 117acce952bSliubo 118acce952bSliubo return errstr; 119acce952bSliubo } 120acce952bSliubo 121acce952bSliubo /* 12234d97007SAnand Jain * __btrfs_handle_fs_error decodes expected errors from the caller and 12352042d8eSAndrea Gelmini * invokes the appropriate error response. 124acce952bSliubo */ 125c0d19e2bSDavid Sterba __cold 12634d97007SAnand Jain void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 1274da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 128acce952bSliubo { 129acce952bSliubo struct super_block *sb = fs_info->sb; 13057d816a1SAnand Jain #ifdef CONFIG_PRINTK 131acce952bSliubo const char *errstr; 13257d816a1SAnand Jain #endif 133acce952bSliubo 134acce952bSliubo /* 135acce952bSliubo * Special case: if the error is EROFS, and we're already 1361751e8a6SLinus Torvalds * under SB_RDONLY, then it is safe here. 137acce952bSliubo */ 138bc98a42cSDavid Howells if (errno == -EROFS && sb_rdonly(sb)) 139acce952bSliubo return; 140acce952bSliubo 14157d816a1SAnand Jain #ifdef CONFIG_PRINTK 14208748810SDavid Sterba errstr = btrfs_decode_error(errno); 1434da35113SJeff Mahoney if (fmt) { 14437252a66SEric Sandeen struct va_format vaf; 14537252a66SEric Sandeen va_list args; 14637252a66SEric Sandeen 14737252a66SEric Sandeen va_start(args, fmt); 14837252a66SEric Sandeen vaf.fmt = fmt; 14937252a66SEric Sandeen vaf.va = &args; 1504da35113SJeff Mahoney 15162e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 15208748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 15337252a66SEric Sandeen va_end(args); 1544da35113SJeff Mahoney } else { 15562e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 15608748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1574da35113SJeff Mahoney } 15857d816a1SAnand Jain #endif 159acce952bSliubo 1600713d90cSAnand Jain /* 1610713d90cSAnand Jain * Today we only save the error info to memory. Long term we'll 1620713d90cSAnand Jain * also send it down to the disk 1630713d90cSAnand Jain */ 1640713d90cSAnand Jain set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 1650713d90cSAnand Jain 1664da35113SJeff Mahoney /* Don't go through full error handling during mount */ 167922ea899SAnand Jain if (!(sb->s_flags & SB_BORN)) 168922ea899SAnand Jain return; 169922ea899SAnand Jain 170922ea899SAnand Jain if (sb_rdonly(sb)) 171922ea899SAnand Jain return; 172922ea899SAnand Jain 173b0643e59SDennis Zhou btrfs_discard_stop(fs_info); 174b0643e59SDennis Zhou 175922ea899SAnand Jain /* btrfs handle error by forcing the filesystem readonly */ 176a0a1db70SFilipe Manana btrfs_set_sb_rdonly(sb); 177922ea899SAnand Jain btrfs_info(fs_info, "forced readonly"); 178922ea899SAnand Jain /* 179922ea899SAnand Jain * Note that a running device replace operation is not canceled here 180922ea899SAnand Jain * although there is no way to update the progress. It would add the 181922ea899SAnand Jain * risk of a deadlock, therefore the canceling is omitted. The only 182922ea899SAnand Jain * penalty is that some I/O remains active until the procedure 18352042d8eSAndrea Gelmini * completes. The next time when the filesystem is mounted writable 184922ea899SAnand Jain * again, the device replace operation continues. 185922ea899SAnand Jain */ 186acce952bSliubo } 1874da35113SJeff Mahoney 18857d816a1SAnand Jain #ifdef CONFIG_PRINTK 189533574c6SJoe Perches static const char * const logtypes[] = { 1904da35113SJeff Mahoney "emergency", 1914da35113SJeff Mahoney "alert", 1924da35113SJeff Mahoney "critical", 1934da35113SJeff Mahoney "error", 1944da35113SJeff Mahoney "warning", 1954da35113SJeff Mahoney "notice", 1964da35113SJeff Mahoney "info", 1974da35113SJeff Mahoney "debug", 1984da35113SJeff Mahoney }; 1994da35113SJeff Mahoney 20035f4e5e6SNikolay Borisov 20135f4e5e6SNikolay Borisov /* 20235f4e5e6SNikolay Borisov * Use one ratelimit state per log level so that a flood of less important 20335f4e5e6SNikolay Borisov * messages doesn't cause more important ones to be dropped. 20435f4e5e6SNikolay Borisov */ 20535f4e5e6SNikolay Borisov static struct ratelimit_state printk_limits[] = { 20635f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), 20735f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), 20835f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), 20935f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), 21035f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), 21135f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), 21235f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), 21335f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), 21435f4e5e6SNikolay Borisov }; 21535f4e5e6SNikolay Borisov 216b105e927SDavid Sterba void __cold btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 2174da35113SJeff Mahoney { 21840f7828bSPetr Mladek char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; 2194da35113SJeff Mahoney struct va_format vaf; 2204da35113SJeff Mahoney va_list args; 221533574c6SJoe Perches int kern_level; 22240f7828bSPetr Mladek const char *type = logtypes[4]; 22340f7828bSPetr Mladek struct ratelimit_state *ratelimit = &printk_limits[4]; 2244da35113SJeff Mahoney 2254da35113SJeff Mahoney va_start(args, fmt); 2264da35113SJeff Mahoney 227262c5e86SPetr Mladek while ((kern_level = printk_get_level(fmt)) != 0) { 228533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 229262c5e86SPetr Mladek 230262c5e86SPetr Mladek if (kern_level >= '0' && kern_level <= '7') { 231533574c6SJoe Perches memcpy(lvl, fmt, size); 232533574c6SJoe Perches lvl[size] = '\0'; 233533574c6SJoe Perches type = logtypes[kern_level - '0']; 23435f4e5e6SNikolay Borisov ratelimit = &printk_limits[kern_level - '0']; 235262c5e86SPetr Mladek } 236262c5e86SPetr Mladek fmt += size; 237262c5e86SPetr Mladek } 238262c5e86SPetr Mladek 2394da35113SJeff Mahoney vaf.fmt = fmt; 2404da35113SJeff Mahoney vaf.va = &args; 241533574c6SJoe Perches 242a0f6d924SDavid Sterba if (__ratelimit(ratelimit)) { 243a0f6d924SDavid Sterba if (fs_info) 2443993b112SColin Ian King printk("%sBTRFS %s (device %s): %pV\n", lvl, type, 245a0f6d924SDavid Sterba fs_info->sb->s_id, &vaf); 246a0f6d924SDavid Sterba else 247a0f6d924SDavid Sterba printk("%sBTRFS %s: %pV\n", lvl, type, &vaf); 248a0f6d924SDavid Sterba } 249533574c6SJoe Perches 250533574c6SJoe Perches va_end(args); 2514da35113SJeff Mahoney } 252533574c6SJoe Perches #endif 253533574c6SJoe Perches 254e9306ad4SQu Wenruo #if BITS_PER_LONG == 32 255e9306ad4SQu Wenruo void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info) 256e9306ad4SQu Wenruo { 257e9306ad4SQu Wenruo if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) { 258e9306ad4SQu Wenruo btrfs_warn(fs_info, "reaching 32bit limit for logical addresses"); 259e9306ad4SQu Wenruo btrfs_warn(fs_info, 260e9306ad4SQu Wenruo "due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT", 261e9306ad4SQu Wenruo BTRFS_32BIT_MAX_FILE_SIZE >> 40); 262e9306ad4SQu Wenruo btrfs_warn(fs_info, 263e9306ad4SQu Wenruo "please consider upgrading to 64bit kernel/hardware"); 264e9306ad4SQu Wenruo } 265e9306ad4SQu Wenruo } 266e9306ad4SQu Wenruo 267e9306ad4SQu Wenruo void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info) 268e9306ad4SQu Wenruo { 269e9306ad4SQu Wenruo if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) { 270e9306ad4SQu Wenruo btrfs_err(fs_info, "reached 32bit limit for logical addresses"); 271e9306ad4SQu Wenruo btrfs_err(fs_info, 272e9306ad4SQu Wenruo "due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed", 273e9306ad4SQu Wenruo BTRFS_32BIT_MAX_FILE_SIZE >> 40); 274e9306ad4SQu Wenruo btrfs_err(fs_info, 275e9306ad4SQu Wenruo "please consider upgrading to 64bit kernel/hardware"); 276e9306ad4SQu Wenruo } 277e9306ad4SQu Wenruo } 278e9306ad4SQu Wenruo #endif 279e9306ad4SQu Wenruo 2808c342930SJeff Mahoney /* 28149b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 28249b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 28349b25e05SJeff Mahoney * one. 28449b25e05SJeff Mahoney * 28549b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 28649b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 28749b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 28849b25e05SJeff Mahoney * in the call path but will return -EIO. 28949b25e05SJeff Mahoney * 29049b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 29149b25e05SJeff Mahoney * btrfs_commit_transaction. 29249b25e05SJeff Mahoney */ 293c0d19e2bSDavid Sterba __cold 29449b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 29566642832SJeff Mahoney const char *function, 29649b25e05SJeff Mahoney unsigned int line, int errno) 29749b25e05SJeff Mahoney { 29866642832SJeff Mahoney struct btrfs_fs_info *fs_info = trans->fs_info; 29966642832SJeff Mahoney 300bf31f87fSDavid Sterba WRITE_ONCE(trans->aborted, errno); 30120c7bcecSSeraphime Kirkovski WRITE_ONCE(trans->transaction->aborted, errno); 302501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 30366642832SJeff Mahoney wake_up(&fs_info->transaction_wait); 30466642832SJeff Mahoney wake_up(&fs_info->transaction_blocked_wait); 30566642832SJeff Mahoney __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); 30649b25e05SJeff Mahoney } 30749b25e05SJeff Mahoney /* 3088c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 3098c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 3108c342930SJeff Mahoney */ 311c0d19e2bSDavid Sterba __cold 3128c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3138c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 3148c342930SJeff Mahoney { 3158c342930SJeff Mahoney char *s_id = "<unknown>"; 3168c342930SJeff Mahoney const char *errstr; 3178c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 3188c342930SJeff Mahoney va_list args; 3198c342930SJeff Mahoney 3208c342930SJeff Mahoney if (fs_info) 3218c342930SJeff Mahoney s_id = fs_info->sb->s_id; 3228c342930SJeff Mahoney 3238c342930SJeff Mahoney va_start(args, fmt); 3248c342930SJeff Mahoney vaf.va = &args; 3258c342930SJeff Mahoney 32608748810SDavid Sterba errstr = btrfs_decode_error(errno); 327d8953d69SSatoru Takeuchi if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) 32808748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 32908748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 3308c342930SJeff Mahoney 331efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 332efe120a0SFrank Holton function, line, &vaf, errno, errstr); 3338c342930SJeff Mahoney va_end(args); 3348c342930SJeff Mahoney /* Caller calls BUG() */ 3358c342930SJeff Mahoney } 336acce952bSliubo 337e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 338e20d96d6SChris Mason { 3396bccf3abSJeff Mahoney close_ctree(btrfs_sb(sb)); 340e20d96d6SChris Mason } 3412e635a27SChris Mason 34295e05289SChris Mason enum { 343416a7202SDavid Sterba Opt_acl, Opt_noacl, 344416a7202SDavid Sterba Opt_clear_cache, 345416a7202SDavid Sterba Opt_commit_interval, 346416a7202SDavid Sterba Opt_compress, 347416a7202SDavid Sterba Opt_compress_force, 348416a7202SDavid Sterba Opt_compress_force_type, 349416a7202SDavid Sterba Opt_compress_type, 350416a7202SDavid Sterba Opt_degraded, 351416a7202SDavid Sterba Opt_device, 352416a7202SDavid Sterba Opt_fatal_errors, 353416a7202SDavid Sterba Opt_flushoncommit, Opt_noflushoncommit, 354416a7202SDavid Sterba Opt_max_inline, 355416a7202SDavid Sterba Opt_barrier, Opt_nobarrier, 356416a7202SDavid Sterba Opt_datacow, Opt_nodatacow, 357416a7202SDavid Sterba Opt_datasum, Opt_nodatasum, 358416a7202SDavid Sterba Opt_defrag, Opt_nodefrag, 359416a7202SDavid Sterba Opt_discard, Opt_nodiscard, 360b0643e59SDennis Zhou Opt_discard_mode, 361416a7202SDavid Sterba Opt_norecovery, 362416a7202SDavid Sterba Opt_ratio, 363416a7202SDavid Sterba Opt_rescan_uuid_tree, 364416a7202SDavid Sterba Opt_skip_balance, 365416a7202SDavid Sterba Opt_space_cache, Opt_no_space_cache, 366416a7202SDavid Sterba Opt_space_cache_version, 367416a7202SDavid Sterba Opt_ssd, Opt_nossd, 368416a7202SDavid Sterba Opt_ssd_spread, Opt_nossd_spread, 369416a7202SDavid Sterba Opt_subvol, 37037becec9SOmar Sandoval Opt_subvol_empty, 371416a7202SDavid Sterba Opt_subvolid, 372416a7202SDavid Sterba Opt_thread_pool, 373416a7202SDavid Sterba Opt_treelog, Opt_notreelog, 374416a7202SDavid Sterba Opt_user_subvol_rm_allowed, 375416a7202SDavid Sterba 37674ef0018SQu Wenruo /* Rescue options */ 37774ef0018SQu Wenruo Opt_rescue, 37874ef0018SQu Wenruo Opt_usebackuproot, 37974ef0018SQu Wenruo Opt_nologreplay, 38042437a63SJosef Bacik Opt_ignorebadroots, 381882dbe0cSJosef Bacik Opt_ignoredatacsums, 3829037d3cbSJosef Bacik Opt_rescue_all, 38374ef0018SQu Wenruo 384416a7202SDavid Sterba /* Deprecated options */ 385416a7202SDavid Sterba Opt_recovery, 3865297199aSNikolay Borisov Opt_inode_cache, Opt_noinode_cache, 387416a7202SDavid Sterba 388416a7202SDavid Sterba /* Debugging options */ 389416a7202SDavid Sterba Opt_check_integrity, 39070f6d82eSOmar Sandoval Opt_check_integrity_including_extent_data, 391416a7202SDavid Sterba Opt_check_integrity_print_mask, 392416a7202SDavid Sterba Opt_enospc_debug, Opt_noenospc_debug, 393d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 394d0bd4560SJosef Bacik Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, 395d0bd4560SJosef Bacik #endif 396fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 397fb592373SJosef Bacik Opt_ref_verify, 398fb592373SJosef Bacik #endif 3999555c6c1SIlya Dryomov Opt_err, 40095e05289SChris Mason }; 40195e05289SChris Mason 4024d4ab6d6SDavid Sterba static const match_table_t tokens = { 403416a7202SDavid Sterba {Opt_acl, "acl"}, 404416a7202SDavid Sterba {Opt_noacl, "noacl"}, 405416a7202SDavid Sterba {Opt_clear_cache, "clear_cache"}, 406416a7202SDavid Sterba {Opt_commit_interval, "commit=%u"}, 407c8b97818SChris Mason {Opt_compress, "compress"}, 408261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 409a555f810SChris Mason {Opt_compress_force, "compress-force"}, 410261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 411416a7202SDavid Sterba {Opt_degraded, "degraded"}, 412416a7202SDavid Sterba {Opt_device, "device=%s"}, 413416a7202SDavid Sterba {Opt_fatal_errors, "fatal_errors=%s"}, 414dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 4152c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 4164b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 4173818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 418416a7202SDavid Sterba {Opt_max_inline, "max_inline=%s"}, 419416a7202SDavid Sterba {Opt_barrier, "barrier"}, 420416a7202SDavid Sterba {Opt_nobarrier, "nobarrier"}, 421416a7202SDavid Sterba {Opt_datacow, "datacow"}, 422416a7202SDavid Sterba {Opt_nodatacow, "nodatacow"}, 423416a7202SDavid Sterba {Opt_datasum, "datasum"}, 424416a7202SDavid Sterba {Opt_nodatasum, "nodatasum"}, 425416a7202SDavid Sterba {Opt_defrag, "autodefrag"}, 426416a7202SDavid Sterba {Opt_nodefrag, "noautodefrag"}, 427416a7202SDavid Sterba {Opt_discard, "discard"}, 428b0643e59SDennis Zhou {Opt_discard_mode, "discard=%s"}, 429416a7202SDavid Sterba {Opt_nodiscard, "nodiscard"}, 430416a7202SDavid Sterba {Opt_norecovery, "norecovery"}, 431416a7202SDavid Sterba {Opt_ratio, "metadata_ratio=%u"}, 432416a7202SDavid Sterba {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 4339555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 434416a7202SDavid Sterba {Opt_space_cache, "space_cache"}, 435416a7202SDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 436416a7202SDavid Sterba {Opt_space_cache_version, "space_cache=%s"}, 437416a7202SDavid Sterba {Opt_ssd, "ssd"}, 438416a7202SDavid Sterba {Opt_nossd, "nossd"}, 439416a7202SDavid Sterba {Opt_ssd_spread, "ssd_spread"}, 440416a7202SDavid Sterba {Opt_nossd_spread, "nossd_spread"}, 441416a7202SDavid Sterba {Opt_subvol, "subvol=%s"}, 44237becec9SOmar Sandoval {Opt_subvol_empty, "subvol="}, 443416a7202SDavid Sterba {Opt_subvolid, "subvolid=%s"}, 444416a7202SDavid Sterba {Opt_thread_pool, "thread_pool=%u"}, 445416a7202SDavid Sterba {Opt_treelog, "treelog"}, 446416a7202SDavid Sterba {Opt_notreelog, "notreelog"}, 447416a7202SDavid Sterba {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 448416a7202SDavid Sterba 44974ef0018SQu Wenruo /* Rescue options */ 45074ef0018SQu Wenruo {Opt_rescue, "rescue=%s"}, 45174ef0018SQu Wenruo /* Deprecated, with alias rescue=nologreplay */ 45274ef0018SQu Wenruo {Opt_nologreplay, "nologreplay"}, 45374ef0018SQu Wenruo /* Deprecated, with alias rescue=usebackuproot */ 45474ef0018SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 45574ef0018SQu Wenruo 456416a7202SDavid Sterba /* Deprecated options */ 457416a7202SDavid Sterba {Opt_recovery, "recovery"}, 458416a7202SDavid Sterba 459416a7202SDavid Sterba /* Debugging options */ 46021adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 46121adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 46202453bdeSAnand Jain {Opt_check_integrity_print_mask, "check_int_print_mask=%u"}, 463416a7202SDavid Sterba {Opt_enospc_debug, "enospc_debug"}, 464416a7202SDavid Sterba {Opt_noenospc_debug, "noenospc_debug"}, 465d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 466d0bd4560SJosef Bacik {Opt_fragment_data, "fragment=data"}, 467d0bd4560SJosef Bacik {Opt_fragment_metadata, "fragment=metadata"}, 468d0bd4560SJosef Bacik {Opt_fragment_all, "fragment=all"}, 469d0bd4560SJosef Bacik #endif 470fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 471fb592373SJosef Bacik {Opt_ref_verify, "ref_verify"}, 472fb592373SJosef Bacik #endif 47333268eafSJosef Bacik {Opt_err, NULL}, 47495e05289SChris Mason }; 47595e05289SChris Mason 47674ef0018SQu Wenruo static const match_table_t rescue_tokens = { 47774ef0018SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 47874ef0018SQu Wenruo {Opt_nologreplay, "nologreplay"}, 47942437a63SJosef Bacik {Opt_ignorebadroots, "ignorebadroots"}, 48042437a63SJosef Bacik {Opt_ignorebadroots, "ibadroots"}, 481882dbe0cSJosef Bacik {Opt_ignoredatacsums, "ignoredatacsums"}, 482882dbe0cSJosef Bacik {Opt_ignoredatacsums, "idatacsums"}, 4839037d3cbSJosef Bacik {Opt_rescue_all, "all"}, 48474ef0018SQu Wenruo {Opt_err, NULL}, 48574ef0018SQu Wenruo }; 48674ef0018SQu Wenruo 487d70bf748SJosef Bacik static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt, 488d70bf748SJosef Bacik const char *opt_name) 489d70bf748SJosef Bacik { 490d70bf748SJosef Bacik if (fs_info->mount_opt & opt) { 491d70bf748SJosef Bacik btrfs_err(fs_info, "%s must be used with ro mount option", 492d70bf748SJosef Bacik opt_name); 493d70bf748SJosef Bacik return true; 494d70bf748SJosef Bacik } 495d70bf748SJosef Bacik return false; 496d70bf748SJosef Bacik } 497d70bf748SJosef Bacik 49874ef0018SQu Wenruo static int parse_rescue_options(struct btrfs_fs_info *info, const char *options) 49974ef0018SQu Wenruo { 50074ef0018SQu Wenruo char *opts; 50174ef0018SQu Wenruo char *orig; 50274ef0018SQu Wenruo char *p; 50374ef0018SQu Wenruo substring_t args[MAX_OPT_ARGS]; 50474ef0018SQu Wenruo int ret = 0; 50574ef0018SQu Wenruo 50674ef0018SQu Wenruo opts = kstrdup(options, GFP_KERNEL); 50774ef0018SQu Wenruo if (!opts) 50874ef0018SQu Wenruo return -ENOMEM; 50974ef0018SQu Wenruo orig = opts; 51074ef0018SQu Wenruo 51174ef0018SQu Wenruo while ((p = strsep(&opts, ":")) != NULL) { 51274ef0018SQu Wenruo int token; 51374ef0018SQu Wenruo 51474ef0018SQu Wenruo if (!*p) 51574ef0018SQu Wenruo continue; 51674ef0018SQu Wenruo token = match_token(p, rescue_tokens, args); 51774ef0018SQu Wenruo switch (token){ 51874ef0018SQu Wenruo case Opt_usebackuproot: 51974ef0018SQu Wenruo btrfs_info(info, 52074ef0018SQu Wenruo "trying to use backup root at mount time"); 52174ef0018SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 52274ef0018SQu Wenruo break; 52374ef0018SQu Wenruo case Opt_nologreplay: 52474ef0018SQu Wenruo btrfs_set_and_info(info, NOLOGREPLAY, 52574ef0018SQu Wenruo "disabling log replay at mount time"); 52674ef0018SQu Wenruo break; 52742437a63SJosef Bacik case Opt_ignorebadroots: 52842437a63SJosef Bacik btrfs_set_and_info(info, IGNOREBADROOTS, 52942437a63SJosef Bacik "ignoring bad roots"); 53042437a63SJosef Bacik break; 531882dbe0cSJosef Bacik case Opt_ignoredatacsums: 532882dbe0cSJosef Bacik btrfs_set_and_info(info, IGNOREDATACSUMS, 533882dbe0cSJosef Bacik "ignoring data csums"); 534882dbe0cSJosef Bacik break; 5359037d3cbSJosef Bacik case Opt_rescue_all: 5369037d3cbSJosef Bacik btrfs_info(info, "enabling all of the rescue options"); 5379037d3cbSJosef Bacik btrfs_set_and_info(info, IGNOREDATACSUMS, 5389037d3cbSJosef Bacik "ignoring data csums"); 5399037d3cbSJosef Bacik btrfs_set_and_info(info, IGNOREBADROOTS, 5409037d3cbSJosef Bacik "ignoring bad roots"); 5419037d3cbSJosef Bacik btrfs_set_and_info(info, NOLOGREPLAY, 5429037d3cbSJosef Bacik "disabling log replay at mount time"); 5439037d3cbSJosef Bacik break; 54474ef0018SQu Wenruo case Opt_err: 54574ef0018SQu Wenruo btrfs_info(info, "unrecognized rescue option '%s'", p); 54674ef0018SQu Wenruo ret = -EINVAL; 54774ef0018SQu Wenruo goto out; 54874ef0018SQu Wenruo default: 54974ef0018SQu Wenruo break; 55074ef0018SQu Wenruo } 55174ef0018SQu Wenruo 55274ef0018SQu Wenruo } 55374ef0018SQu Wenruo out: 55474ef0018SQu Wenruo kfree(orig); 55574ef0018SQu Wenruo return ret; 55674ef0018SQu Wenruo } 55774ef0018SQu Wenruo 558edf24abeSChristoph Hellwig /* 559edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 560edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 56149b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 562edf24abeSChristoph Hellwig */ 5632ff7e61eSJeff Mahoney int btrfs_parse_options(struct btrfs_fs_info *info, char *options, 56496da0919SQu Wenruo unsigned long new_flags) 56595e05289SChris Mason { 56695e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 567e215772cSMisono, Tomohiro char *p, *num; 5684543df7eSChris Mason int intarg; 569a7a3f7caSSage Weil int ret = 0; 570261507a0SLi Zefan char *compress_type; 571261507a0SLi Zefan bool compress_force = false; 572b7c47bbbSTsutomu Itoh enum btrfs_compression_type saved_compress_type; 57327942c99SDavid Sterba int saved_compress_level; 574b7c47bbbSTsutomu Itoh bool saved_compress_force; 575b7c47bbbSTsutomu Itoh int no_compress = 0; 576b6cda9bcSChris Mason 5770b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) 57870f6d82eSOmar Sandoval btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); 57994846229SBoris Burkov else if (btrfs_free_space_cache_v1_active(info)) { 5805d1ab66cSNaohiro Aota if (btrfs_is_zoned(info)) { 5815d1ab66cSNaohiro Aota btrfs_info(info, 5825d1ab66cSNaohiro Aota "zoned: clearing existing space cache"); 5835d1ab66cSNaohiro Aota btrfs_set_super_cache_generation(info->super_copy, 0); 5845d1ab66cSNaohiro Aota } else { 58573bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 5865d1ab66cSNaohiro Aota } 5875d1ab66cSNaohiro Aota } 58873bc1876SJosef Bacik 58996da0919SQu Wenruo /* 59096da0919SQu Wenruo * Even the options are empty, we still need to do extra check 59196da0919SQu Wenruo * against new flags 59296da0919SQu Wenruo */ 59395e05289SChris Mason if (!options) 59496da0919SQu Wenruo goto check; 59595e05289SChris Mason 59695e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 59795e05289SChris Mason int token; 59895e05289SChris Mason if (!*p) 59995e05289SChris Mason continue; 60095e05289SChris Mason 60195e05289SChris Mason token = match_token(p, tokens, args); 60295e05289SChris Mason switch (token) { 603dfe25020SChris Mason case Opt_degraded: 6040b246afaSJeff Mahoney btrfs_info(info, "allowing degraded mounts"); 605dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 606dfe25020SChris Mason break; 60795e05289SChris Mason case Opt_subvol: 60837becec9SOmar Sandoval case Opt_subvol_empty: 60973f73415SJosef Bacik case Opt_subvolid: 61043e570b0SChristoph Hellwig case Opt_device: 611edf24abeSChristoph Hellwig /* 612fa59f27cSAnand Jain * These are parsed by btrfs_parse_subvol_options or 613fa59f27cSAnand Jain * btrfs_parse_device_options and can be ignored here. 614edf24abeSChristoph Hellwig */ 61595e05289SChris Mason break; 616b6cda9bcSChris Mason case Opt_nodatasum: 6173cdde224SJeff Mahoney btrfs_set_and_info(info, NODATASUM, 61807802534SQu Wenruo "setting nodatasum"); 619be20aa9dSChris Mason break; 620d399167dSQu Wenruo case Opt_datasum: 6213cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) { 6223cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 6230b246afaSJeff Mahoney btrfs_info(info, 6245d163e0eSJeff Mahoney "setting datasum, datacow enabled"); 625d399167dSQu Wenruo else 6260b246afaSJeff Mahoney btrfs_info(info, "setting datasum"); 62707802534SQu Wenruo } 628d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 629d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 630d399167dSQu Wenruo break; 631be20aa9dSChris Mason case Opt_nodatacow: 6323cdde224SJeff Mahoney if (!btrfs_test_opt(info, NODATACOW)) { 6333cdde224SJeff Mahoney if (!btrfs_test_opt(info, COMPRESS) || 6343cdde224SJeff Mahoney !btrfs_test_opt(info, FORCE_COMPRESS)) { 6350b246afaSJeff Mahoney btrfs_info(info, 636efe120a0SFrank Holton "setting nodatacow, compression disabled"); 637bedb2ccaSAndrei Popa } else { 6380b246afaSJeff Mahoney btrfs_info(info, "setting nodatacow"); 639bedb2ccaSAndrei Popa } 64007802534SQu Wenruo } 641bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 642bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 643be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 644be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 645b6cda9bcSChris Mason break; 646a258af7aSQu Wenruo case Opt_datacow: 6473cdde224SJeff Mahoney btrfs_clear_and_info(info, NODATACOW, 64807802534SQu Wenruo "setting datacow"); 649a258af7aSQu Wenruo break; 650a555f810SChris Mason case Opt_compress_force: 651261507a0SLi Zefan case Opt_compress_force_type: 652261507a0SLi Zefan compress_force = true; 653c730ae0cSMarcos Paulo de Souza fallthrough; 654261507a0SLi Zefan case Opt_compress: 655261507a0SLi Zefan case Opt_compress_type: 6563cdde224SJeff Mahoney saved_compress_type = btrfs_test_opt(info, 6573cdde224SJeff Mahoney COMPRESS) ? 658b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 659b7c47bbbSTsutomu Itoh saved_compress_force = 6603cdde224SJeff Mahoney btrfs_test_opt(info, FORCE_COMPRESS); 66127942c99SDavid Sterba saved_compress_level = info->compress_level; 662261507a0SLi Zefan if (token == Opt_compress || 663261507a0SLi Zefan token == Opt_compress_force || 664a7164fa4SDavid Sterba strncmp(args[0].from, "zlib", 4) == 0) { 665261507a0SLi Zefan compress_type = "zlib"; 666eae8d825SQu Wenruo 667261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 668eae8d825SQu Wenruo info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; 669eae8d825SQu Wenruo /* 670eae8d825SQu Wenruo * args[0] contains uninitialized data since 671eae8d825SQu Wenruo * for these tokens we don't expect any 672eae8d825SQu Wenruo * parameter. 673eae8d825SQu Wenruo */ 674eae8d825SQu Wenruo if (token != Opt_compress && 675eae8d825SQu Wenruo token != Opt_compress_force) 676f51d2b59SDavid Sterba info->compress_level = 677d0ab62ceSDennis Zhou btrfs_compress_str2level( 678d0ab62ceSDennis Zhou BTRFS_COMPRESS_ZLIB, 679d0ab62ceSDennis Zhou args[0].from + 4); 680063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 681bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 682bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 683b7c47bbbSTsutomu Itoh no_compress = 0; 684a7164fa4SDavid Sterba } else if (strncmp(args[0].from, "lzo", 3) == 0) { 685a6fa6faeSLi Zefan compress_type = "lzo"; 686a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 687282dd7d7SMarcos Paulo de Souza info->compress_level = 0; 688063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 689bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 690bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 6912b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 692b7c47bbbSTsutomu Itoh no_compress = 0; 6933f93aef5SDennis Zhou } else if (strncmp(args[0].from, "zstd", 4) == 0) { 6945c1aab1dSNick Terrell compress_type = "zstd"; 6955c1aab1dSNick Terrell info->compress_type = BTRFS_COMPRESS_ZSTD; 6963f93aef5SDennis Zhou info->compress_level = 6973f93aef5SDennis Zhou btrfs_compress_str2level( 6983f93aef5SDennis Zhou BTRFS_COMPRESS_ZSTD, 6993f93aef5SDennis Zhou args[0].from + 4); 7005c1aab1dSNick Terrell btrfs_set_opt(info->mount_opt, COMPRESS); 7015c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATACOW); 7025c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATASUM); 7035c1aab1dSNick Terrell btrfs_set_fs_incompat(info, COMPRESS_ZSTD); 7045c1aab1dSNick Terrell no_compress = 0; 705063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 706063849eaSArnd Hannemann compress_type = "no"; 70727942c99SDavid Sterba info->compress_level = 0; 70827942c99SDavid Sterba info->compress_type = 0; 709063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 710063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 711063849eaSArnd Hannemann compress_force = false; 712b7c47bbbSTsutomu Itoh no_compress++; 713261507a0SLi Zefan } else { 714261507a0SLi Zefan ret = -EINVAL; 715261507a0SLi Zefan goto out; 716261507a0SLi Zefan } 717261507a0SLi Zefan 718261507a0SLi Zefan if (compress_force) { 719b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 720143f3636SDavid Sterba } else { 7214027e0f4SWang Shilong /* 7224027e0f4SWang Shilong * If we remount from compress-force=xxx to 7234027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 7244027e0f4SWang Shilong * flag, otherwise, there is no way for users 7254027e0f4SWang Shilong * to disable forcible compression separately. 7264027e0f4SWang Shilong */ 7274027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 728a7e252afSMiao Xie } 72927942c99SDavid Sterba if (no_compress == 1) { 73027942c99SDavid Sterba btrfs_info(info, "use no compression"); 73127942c99SDavid Sterba } else if ((info->compress_type != saved_compress_type) || 73227942c99SDavid Sterba (compress_force != saved_compress_force) || 73327942c99SDavid Sterba (info->compress_level != saved_compress_level)) { 734f51d2b59SDavid Sterba btrfs_info(info, "%s %s compression, level %d", 735b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 736f51d2b59SDavid Sterba compress_type, info->compress_level); 737b7c47bbbSTsutomu Itoh } 738b7c47bbbSTsutomu Itoh compress_force = false; 739a555f810SChris Mason break; 740e18e4809SChris Mason case Opt_ssd: 7413cdde224SJeff Mahoney btrfs_set_and_info(info, SSD, 742583b7231SHans van Kranenburg "enabling ssd optimizations"); 743951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 744e18e4809SChris Mason break; 745451d7585SChris Mason case Opt_ssd_spread: 746583b7231SHans van Kranenburg btrfs_set_and_info(info, SSD, 747583b7231SHans van Kranenburg "enabling ssd optimizations"); 7483cdde224SJeff Mahoney btrfs_set_and_info(info, SSD_SPREAD, 749583b7231SHans van Kranenburg "using spread ssd allocation scheme"); 750951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 751451d7585SChris Mason break; 7523b30c22fSChris Mason case Opt_nossd: 753583b7231SHans van Kranenburg btrfs_set_opt(info->mount_opt, NOSSD); 754583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD, 755583b7231SHans van Kranenburg "not using ssd optimizations"); 756c730ae0cSMarcos Paulo de Souza fallthrough; 75762b8e077SHoward McLauchlan case Opt_nossd_spread: 758583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD_SPREAD, 759583b7231SHans van Kranenburg "not using spread ssd allocation scheme"); 7603b30c22fSChris Mason break; 761842bef58SQu Wenruo case Opt_barrier: 7623cdde224SJeff Mahoney btrfs_clear_and_info(info, NOBARRIER, 76307802534SQu Wenruo "turning on barriers"); 764842bef58SQu Wenruo break; 76521ad10cfSChris Mason case Opt_nobarrier: 7663cdde224SJeff Mahoney btrfs_set_and_info(info, NOBARRIER, 76707802534SQu Wenruo "turning off barriers"); 76821ad10cfSChris Mason break; 7694543df7eSChris Mason case Opt_thread_pool: 7702c334e87SWang Shilong ret = match_int(&args[0], &intarg); 7712c334e87SWang Shilong if (ret) { 7722c334e87SWang Shilong goto out; 773f7b885beSAnand Jain } else if (intarg == 0) { 7742c334e87SWang Shilong ret = -EINVAL; 7752c334e87SWang Shilong goto out; 7762c334e87SWang Shilong } 777f7b885beSAnand Jain info->thread_pool_size = intarg; 7784543df7eSChris Mason break; 7796f568d35SChris Mason case Opt_max_inline: 780edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 7816f568d35SChris Mason if (num) { 78291748467SAkinobu Mita info->max_inline = memparse(num, NULL); 7836f568d35SChris Mason kfree(num); 7846f568d35SChris Mason 78515ada040SChris Mason if (info->max_inline) { 786feb5f965SMitch Harder info->max_inline = min_t(u64, 78715ada040SChris Mason info->max_inline, 7880b246afaSJeff Mahoney info->sectorsize); 78915ada040SChris Mason } 7900b246afaSJeff Mahoney btrfs_info(info, "max_inline at %llu", 791c1c9ff7cSGeert Uytterhoeven info->max_inline); 7922c334e87SWang Shilong } else { 7932c334e87SWang Shilong ret = -ENOMEM; 7942c334e87SWang Shilong goto out; 7956f568d35SChris Mason } 7966f568d35SChris Mason break; 797bd0330adSQu Wenruo case Opt_acl: 79845ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 7991751e8a6SLinus Torvalds info->sb->s_flags |= SB_POSIXACL; 800bd0330adSQu Wenruo break; 80145ff35d6SGuangliang Zhao #else 8020b246afaSJeff Mahoney btrfs_err(info, "support for ACL not compiled in!"); 80345ff35d6SGuangliang Zhao ret = -EINVAL; 80445ff35d6SGuangliang Zhao goto out; 80545ff35d6SGuangliang Zhao #endif 80633268eafSJosef Bacik case Opt_noacl: 8071751e8a6SLinus Torvalds info->sb->s_flags &= ~SB_POSIXACL; 80833268eafSJosef Bacik break; 8093a5e1404SSage Weil case Opt_notreelog: 8103cdde224SJeff Mahoney btrfs_set_and_info(info, NOTREELOG, 81107802534SQu Wenruo "disabling tree log"); 8123a5e1404SSage Weil break; 813a88998f2SQu Wenruo case Opt_treelog: 8143cdde224SJeff Mahoney btrfs_clear_and_info(info, NOTREELOG, 81507802534SQu Wenruo "enabling tree log"); 816a88998f2SQu Wenruo break; 817fed8f166SQu Wenruo case Opt_norecovery: 81896da0919SQu Wenruo case Opt_nologreplay: 81974ef0018SQu Wenruo btrfs_warn(info, 82074ef0018SQu Wenruo "'nologreplay' is deprecated, use 'rescue=nologreplay' instead"); 8213cdde224SJeff Mahoney btrfs_set_and_info(info, NOLOGREPLAY, 82296da0919SQu Wenruo "disabling log replay at mount time"); 82396da0919SQu Wenruo break; 824dccae999SSage Weil case Opt_flushoncommit: 8253cdde224SJeff Mahoney btrfs_set_and_info(info, FLUSHONCOMMIT, 82607802534SQu Wenruo "turning on flush-on-commit"); 827dccae999SSage Weil break; 8282c9ee856SQu Wenruo case Opt_noflushoncommit: 8293cdde224SJeff Mahoney btrfs_clear_and_info(info, FLUSHONCOMMIT, 83007802534SQu Wenruo "turning off flush-on-commit"); 8312c9ee856SQu Wenruo break; 83297e728d4SJosef Bacik case Opt_ratio: 8332c334e87SWang Shilong ret = match_int(&args[0], &intarg); 834764cb8b4SAnand Jain if (ret) 8352c334e87SWang Shilong goto out; 83697e728d4SJosef Bacik info->metadata_ratio = intarg; 837764cb8b4SAnand Jain btrfs_info(info, "metadata ratio %u", 83897e728d4SJosef Bacik info->metadata_ratio); 83997e728d4SJosef Bacik break; 840e244a0aeSChristoph Hellwig case Opt_discard: 841b0643e59SDennis Zhou case Opt_discard_mode: 842b0643e59SDennis Zhou if (token == Opt_discard || 843b0643e59SDennis Zhou strcmp(args[0].from, "sync") == 0) { 844b0643e59SDennis Zhou btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC); 84546b27f50SDennis Zhou btrfs_set_and_info(info, DISCARD_SYNC, 84646b27f50SDennis Zhou "turning on sync discard"); 847b0643e59SDennis Zhou } else if (strcmp(args[0].from, "async") == 0) { 848b0643e59SDennis Zhou btrfs_clear_opt(info->mount_opt, DISCARD_SYNC); 849b0643e59SDennis Zhou btrfs_set_and_info(info, DISCARD_ASYNC, 850b0643e59SDennis Zhou "turning on async discard"); 851b0643e59SDennis Zhou } else { 852b0643e59SDennis Zhou ret = -EINVAL; 853b0643e59SDennis Zhou goto out; 854b0643e59SDennis Zhou } 855e244a0aeSChristoph Hellwig break; 856e07a2adeSQu Wenruo case Opt_nodiscard: 85746b27f50SDennis Zhou btrfs_clear_and_info(info, DISCARD_SYNC, 85807802534SQu Wenruo "turning off discard"); 859b0643e59SDennis Zhou btrfs_clear_and_info(info, DISCARD_ASYNC, 860b0643e59SDennis Zhou "turning off async discard"); 861e07a2adeSQu Wenruo break; 8620af3d00bSJosef Bacik case Opt_space_cache: 86370f6d82eSOmar Sandoval case Opt_space_cache_version: 86470f6d82eSOmar Sandoval if (token == Opt_space_cache || 86570f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 8660b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 86770f6d82eSOmar Sandoval FREE_SPACE_TREE); 8683cdde224SJeff Mahoney btrfs_set_and_info(info, SPACE_CACHE, 86907802534SQu Wenruo "enabling disk space caching"); 87070f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 8710b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 87270f6d82eSOmar Sandoval SPACE_CACHE); 8730b246afaSJeff Mahoney btrfs_set_and_info(info, FREE_SPACE_TREE, 87470f6d82eSOmar Sandoval "enabling free space tree"); 87570f6d82eSOmar Sandoval } else { 87670f6d82eSOmar Sandoval ret = -EINVAL; 87770f6d82eSOmar Sandoval goto out; 87870f6d82eSOmar Sandoval } 8790de90876SJosef Bacik break; 880f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 881f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 882f420ee1eSStefan Behrens break; 88373bc1876SJosef Bacik case Opt_no_space_cache: 8843cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) { 8850b246afaSJeff Mahoney btrfs_clear_and_info(info, SPACE_CACHE, 88607802534SQu Wenruo "disabling disk space caching"); 88770f6d82eSOmar Sandoval } 8883cdde224SJeff Mahoney if (btrfs_test_opt(info, FREE_SPACE_TREE)) { 8890b246afaSJeff Mahoney btrfs_clear_and_info(info, FREE_SPACE_TREE, 89070f6d82eSOmar Sandoval "disabling free space tree"); 89170f6d82eSOmar Sandoval } 89273bc1876SJosef Bacik break; 8934b9465cbSChris Mason case Opt_inode_cache: 8943818aea2SQu Wenruo case Opt_noinode_cache: 8955297199aSNikolay Borisov btrfs_warn(info, 8965297199aSNikolay Borisov "the 'inode_cache' option is deprecated and has no effect since 5.11"); 8974b9465cbSChris Mason break; 89888c2ba3bSJosef Bacik case Opt_clear_cache: 8993cdde224SJeff Mahoney btrfs_set_and_info(info, CLEAR_CACHE, 90007802534SQu Wenruo "force clearing of disk cache"); 9010af3d00bSJosef Bacik break; 9024260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 9034260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 9044260f7c7SSage Weil break; 90591435650SChris Mason case Opt_enospc_debug: 90691435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 90791435650SChris Mason break; 90853036293SQu Wenruo case Opt_noenospc_debug: 90953036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 91053036293SQu Wenruo break; 9114cb5300bSChris Mason case Opt_defrag: 9123cdde224SJeff Mahoney btrfs_set_and_info(info, AUTO_DEFRAG, 91307802534SQu Wenruo "enabling auto defrag"); 9144cb5300bSChris Mason break; 915fc0ca9afSQu Wenruo case Opt_nodefrag: 9163cdde224SJeff Mahoney btrfs_clear_and_info(info, AUTO_DEFRAG, 91707802534SQu Wenruo "disabling auto defrag"); 918fc0ca9afSQu Wenruo break; 919af31f5e5SChris Mason case Opt_recovery: 9208dcddfa0SQu Wenruo case Opt_usebackuproot: 92174ef0018SQu Wenruo btrfs_warn(info, 92274ef0018SQu Wenruo "'%s' is deprecated, use 'rescue=usebackuproot' instead", 92374ef0018SQu Wenruo token == Opt_recovery ? "recovery" : 92474ef0018SQu Wenruo "usebackuproot"); 9250b246afaSJeff Mahoney btrfs_info(info, 9268dcddfa0SQu Wenruo "trying to use backup root at mount time"); 9278dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 928af31f5e5SChris Mason break; 9299555c6c1SIlya Dryomov case Opt_skip_balance: 9309555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 9319555c6c1SIlya Dryomov break; 93221adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 93321adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 9340b246afaSJeff Mahoney btrfs_info(info, 935efe120a0SFrank Holton "enabling check integrity including extent data"); 936cbeaae4fSDavid Sterba btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY_DATA); 93721adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 93821adbd5cSStefan Behrens break; 93921adbd5cSStefan Behrens case Opt_check_integrity: 9400b246afaSJeff Mahoney btrfs_info(info, "enabling check integrity"); 94121adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 94221adbd5cSStefan Behrens break; 94321adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 9442c334e87SWang Shilong ret = match_int(&args[0], &intarg); 94502453bdeSAnand Jain if (ret) 9462c334e87SWang Shilong goto out; 94721adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 94802453bdeSAnand Jain btrfs_info(info, "check_integrity_print_mask 0x%x", 94921adbd5cSStefan Behrens info->check_integrity_print_mask); 95021adbd5cSStefan Behrens break; 95121adbd5cSStefan Behrens #else 95221adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 95321adbd5cSStefan Behrens case Opt_check_integrity: 95421adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 9550b246afaSJeff Mahoney btrfs_err(info, 956efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 95721adbd5cSStefan Behrens ret = -EINVAL; 95821adbd5cSStefan Behrens goto out; 95921adbd5cSStefan Behrens #endif 9608c342930SJeff Mahoney case Opt_fatal_errors: 9618c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 9628c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 9638c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 9648c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 9658c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 9668c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 9678c342930SJeff Mahoney else { 9688c342930SJeff Mahoney ret = -EINVAL; 9698c342930SJeff Mahoney goto out; 9708c342930SJeff Mahoney } 9718c342930SJeff Mahoney break; 9728b87dc17SDavid Sterba case Opt_commit_interval: 9738b87dc17SDavid Sterba intarg = 0; 9748b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 975d3740608SAnand Jain if (ret) 9768b87dc17SDavid Sterba goto out; 977d3740608SAnand Jain if (intarg == 0) { 978d3740608SAnand Jain btrfs_info(info, 979d3740608SAnand Jain "using default commit interval %us", 980d3740608SAnand Jain BTRFS_DEFAULT_COMMIT_INTERVAL); 981d3740608SAnand Jain intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; 982d3740608SAnand Jain } else if (intarg > 300) { 983d3740608SAnand Jain btrfs_warn(info, "excessive commit interval %d", 9848b87dc17SDavid Sterba intarg); 9858b87dc17SDavid Sterba } 9868b87dc17SDavid Sterba info->commit_interval = intarg; 9878b87dc17SDavid Sterba break; 98874ef0018SQu Wenruo case Opt_rescue: 98974ef0018SQu Wenruo ret = parse_rescue_options(info, args[0].from); 99074ef0018SQu Wenruo if (ret < 0) 99174ef0018SQu Wenruo goto out; 99274ef0018SQu Wenruo break; 993d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 994d0bd4560SJosef Bacik case Opt_fragment_all: 9950b246afaSJeff Mahoney btrfs_info(info, "fragmenting all space"); 996d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 997d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 998d0bd4560SJosef Bacik break; 999d0bd4560SJosef Bacik case Opt_fragment_metadata: 10000b246afaSJeff Mahoney btrfs_info(info, "fragmenting metadata"); 1001d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 1002d0bd4560SJosef Bacik FRAGMENT_METADATA); 1003d0bd4560SJosef Bacik break; 1004d0bd4560SJosef Bacik case Opt_fragment_data: 10050b246afaSJeff Mahoney btrfs_info(info, "fragmenting data"); 1006d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 1007d0bd4560SJosef Bacik break; 1008d0bd4560SJosef Bacik #endif 1009fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 1010fb592373SJosef Bacik case Opt_ref_verify: 1011fb592373SJosef Bacik btrfs_info(info, "doing ref verification"); 1012fb592373SJosef Bacik btrfs_set_opt(info->mount_opt, REF_VERIFY); 1013fb592373SJosef Bacik break; 1014fb592373SJosef Bacik #endif 1015a7a3f7caSSage Weil case Opt_err: 10167e8f19e5SDavid Sterba btrfs_err(info, "unrecognized mount option '%s'", p); 1017a7a3f7caSSage Weil ret = -EINVAL; 1018a7a3f7caSSage Weil goto out; 101995e05289SChris Mason default: 1020be20aa9dSChris Mason break; 102195e05289SChris Mason } 102295e05289SChris Mason } 102396da0919SQu Wenruo check: 1024d70bf748SJosef Bacik /* We're read-only, don't have to check. */ 1025d70bf748SJosef Bacik if (new_flags & SB_RDONLY) 1026d70bf748SJosef Bacik goto out; 1027d70bf748SJosef Bacik 102842437a63SJosef Bacik if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || 1029882dbe0cSJosef Bacik check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || 1030882dbe0cSJosef Bacik check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")) 103196da0919SQu Wenruo ret = -EINVAL; 1032a7a3f7caSSage Weil out: 10330b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && 10343cdde224SJeff Mahoney !btrfs_test_opt(info, FREE_SPACE_TREE) && 10353cdde224SJeff Mahoney !btrfs_test_opt(info, CLEAR_CACHE)) { 10360b246afaSJeff Mahoney btrfs_err(info, "cannot disable free space tree"); 103770f6d82eSOmar Sandoval ret = -EINVAL; 103870f6d82eSOmar Sandoval 103970f6d82eSOmar Sandoval } 10405d1ab66cSNaohiro Aota if (!ret) 10415d1ab66cSNaohiro Aota ret = btrfs_check_mountopts_zoned(info); 10423cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, SPACE_CACHE)) 10430b246afaSJeff Mahoney btrfs_info(info, "disk space caching is enabled"); 10443cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) 10450b246afaSJeff Mahoney btrfs_info(info, "using free space tree"); 1046a7a3f7caSSage Weil return ret; 1047edf24abeSChristoph Hellwig } 1048edf24abeSChristoph Hellwig 1049edf24abeSChristoph Hellwig /* 1050edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 1051edf24abeSChristoph Hellwig * 1052edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 1053edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 1054edf24abeSChristoph Hellwig */ 1055fa59f27cSAnand Jain static int btrfs_parse_device_options(const char *options, fmode_t flags, 1056d64dcbd1SGu Jinxiang void *holder) 1057edf24abeSChristoph Hellwig { 1058edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 105983c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 106036350e95SGu Jinxiang struct btrfs_device *device = NULL; 1061d7407606SMisono, Tomohiro int error = 0; 1062d7407606SMisono, Tomohiro 10635139cff5SDavid Sterba lockdep_assert_held(&uuid_mutex); 10645139cff5SDavid Sterba 1065d7407606SMisono, Tomohiro if (!options) 1066d7407606SMisono, Tomohiro return 0; 1067d7407606SMisono, Tomohiro 1068d7407606SMisono, Tomohiro /* 1069d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because btrfs_parse_options 1070d7407606SMisono, Tomohiro * gets called later 1071d7407606SMisono, Tomohiro */ 1072d7407606SMisono, Tomohiro opts = kstrdup(options, GFP_KERNEL); 1073d7407606SMisono, Tomohiro if (!opts) 1074d7407606SMisono, Tomohiro return -ENOMEM; 1075d7407606SMisono, Tomohiro orig = opts; 1076d7407606SMisono, Tomohiro 1077d7407606SMisono, Tomohiro while ((p = strsep(&opts, ",")) != NULL) { 1078d7407606SMisono, Tomohiro int token; 1079d7407606SMisono, Tomohiro 1080d7407606SMisono, Tomohiro if (!*p) 1081d7407606SMisono, Tomohiro continue; 1082d7407606SMisono, Tomohiro 1083d7407606SMisono, Tomohiro token = match_token(p, tokens, args); 1084d7407606SMisono, Tomohiro if (token == Opt_device) { 1085d7407606SMisono, Tomohiro device_name = match_strdup(&args[0]); 1086d7407606SMisono, Tomohiro if (!device_name) { 1087d7407606SMisono, Tomohiro error = -ENOMEM; 1088d7407606SMisono, Tomohiro goto out; 1089d7407606SMisono, Tomohiro } 109036350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, flags, 109136350e95SGu Jinxiang holder); 1092d7407606SMisono, Tomohiro kfree(device_name); 109336350e95SGu Jinxiang if (IS_ERR(device)) { 109436350e95SGu Jinxiang error = PTR_ERR(device); 1095d7407606SMisono, Tomohiro goto out; 1096d7407606SMisono, Tomohiro } 1097d7407606SMisono, Tomohiro } 109836350e95SGu Jinxiang } 1099d7407606SMisono, Tomohiro 1100d7407606SMisono, Tomohiro out: 1101d7407606SMisono, Tomohiro kfree(orig); 1102d7407606SMisono, Tomohiro return error; 1103d7407606SMisono, Tomohiro } 1104d7407606SMisono, Tomohiro 1105d7407606SMisono, Tomohiro /* 1106d7407606SMisono, Tomohiro * Parse mount options that are related to subvolume id 1107d7407606SMisono, Tomohiro * 1108d7407606SMisono, Tomohiro * The value is later passed to mount_subvol() 1109d7407606SMisono, Tomohiro */ 111093b9bcdfSGu Jinxiang static int btrfs_parse_subvol_options(const char *options, char **subvol_name, 111193b9bcdfSGu Jinxiang u64 *subvol_objectid) 1112d7407606SMisono, Tomohiro { 1113d7407606SMisono, Tomohiro substring_t args[MAX_OPT_ARGS]; 1114d7407606SMisono, Tomohiro char *opts, *orig, *p; 1115edf24abeSChristoph Hellwig int error = 0; 1116ccb0e7d1SAnand Jain u64 subvolid; 1117edf24abeSChristoph Hellwig 1118edf24abeSChristoph Hellwig if (!options) 1119830c4adbSJosef Bacik return 0; 1120edf24abeSChristoph Hellwig 1121edf24abeSChristoph Hellwig /* 1122d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because 1123fa59f27cSAnand Jain * btrfs_parse_device_options gets called later 1124edf24abeSChristoph Hellwig */ 1125edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 1126edf24abeSChristoph Hellwig if (!opts) 1127edf24abeSChristoph Hellwig return -ENOMEM; 11283f3d0bc0STero Roponen orig = opts; 1129edf24abeSChristoph Hellwig 1130edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 1131edf24abeSChristoph Hellwig int token; 1132edf24abeSChristoph Hellwig if (!*p) 1133edf24abeSChristoph Hellwig continue; 1134edf24abeSChristoph Hellwig 1135edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 1136edf24abeSChristoph Hellwig switch (token) { 1137edf24abeSChristoph Hellwig case Opt_subvol: 1138a90e8b6fSIlya Dryomov kfree(*subvol_name); 1139edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 11402c334e87SWang Shilong if (!*subvol_name) { 11412c334e87SWang Shilong error = -ENOMEM; 11422c334e87SWang Shilong goto out; 11432c334e87SWang Shilong } 1144edf24abeSChristoph Hellwig break; 114573f73415SJosef Bacik case Opt_subvolid: 1146ccb0e7d1SAnand Jain error = match_u64(&args[0], &subvolid); 1147ccb0e7d1SAnand Jain if (error) 11482c334e87SWang Shilong goto out; 1149ccb0e7d1SAnand Jain 1150ccb0e7d1SAnand Jain /* we want the original fs_tree */ 1151ccb0e7d1SAnand Jain if (subvolid == 0) 1152ccb0e7d1SAnand Jain subvolid = BTRFS_FS_TREE_OBJECTID; 1153ccb0e7d1SAnand Jain 1154ccb0e7d1SAnand Jain *subvol_objectid = subvolid; 115573f73415SJosef Bacik break; 1156edf24abeSChristoph Hellwig default: 1157edf24abeSChristoph Hellwig break; 1158edf24abeSChristoph Hellwig } 1159edf24abeSChristoph Hellwig } 1160edf24abeSChristoph Hellwig 1161edf24abeSChristoph Hellwig out: 1162830c4adbSJosef Bacik kfree(orig); 1163edf24abeSChristoph Hellwig return error; 116495e05289SChris Mason } 116595e05289SChris Mason 1166c0c907a4SMarcos Paulo de Souza char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 116773f73415SJosef Bacik u64 subvol_objectid) 116873f73415SJosef Bacik { 1169815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 11705168489aSJosef Bacik struct btrfs_root *fs_root = NULL; 117105dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 117205dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 117305dbe683SOmar Sandoval struct btrfs_key key; 117405dbe683SOmar Sandoval struct btrfs_path *path = NULL; 117505dbe683SOmar Sandoval char *name = NULL, *ptr; 117605dbe683SOmar Sandoval u64 dirid; 117705dbe683SOmar Sandoval int len; 117805dbe683SOmar Sandoval int ret; 117905dbe683SOmar Sandoval 118005dbe683SOmar Sandoval path = btrfs_alloc_path(); 118105dbe683SOmar Sandoval if (!path) { 118205dbe683SOmar Sandoval ret = -ENOMEM; 118305dbe683SOmar Sandoval goto err; 118405dbe683SOmar Sandoval } 118505dbe683SOmar Sandoval 11863ec83621SDavid Sterba name = kmalloc(PATH_MAX, GFP_KERNEL); 118705dbe683SOmar Sandoval if (!name) { 118805dbe683SOmar Sandoval ret = -ENOMEM; 118905dbe683SOmar Sandoval goto err; 119005dbe683SOmar Sandoval } 119105dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 119205dbe683SOmar Sandoval ptr[0] = '\0'; 119305dbe683SOmar Sandoval 119405dbe683SOmar Sandoval /* 119505dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 119605dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 119705dbe683SOmar Sandoval */ 119805dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 119905dbe683SOmar Sandoval key.objectid = subvol_objectid; 120005dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 120105dbe683SOmar Sandoval key.offset = (u64)-1; 120205dbe683SOmar Sandoval 12030ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 120405dbe683SOmar Sandoval if (ret < 0) { 120505dbe683SOmar Sandoval goto err; 120605dbe683SOmar Sandoval } else if (ret > 0) { 120705dbe683SOmar Sandoval ret = -ENOENT; 120805dbe683SOmar Sandoval goto err; 120905dbe683SOmar Sandoval } 121005dbe683SOmar Sandoval 121105dbe683SOmar Sandoval subvol_objectid = key.offset; 121205dbe683SOmar Sandoval 121305dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 121405dbe683SOmar Sandoval struct btrfs_root_ref); 121505dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 121605dbe683SOmar Sandoval ptr -= len + 1; 121705dbe683SOmar Sandoval if (ptr < name) { 121805dbe683SOmar Sandoval ret = -ENAMETOOLONG; 121905dbe683SOmar Sandoval goto err; 122005dbe683SOmar Sandoval } 122105dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 122205dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 122305dbe683SOmar Sandoval ptr[0] = '/'; 122405dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 122505dbe683SOmar Sandoval btrfs_release_path(path); 122605dbe683SOmar Sandoval 122756e9357aSDavid Sterba fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true); 122805dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 122905dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 12305168489aSJosef Bacik fs_root = NULL; 12315168489aSJosef Bacik goto err; 12325168489aSJosef Bacik } 123305dbe683SOmar Sandoval 123405dbe683SOmar Sandoval /* 123505dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 123605dbe683SOmar Sandoval * root directory. 123705dbe683SOmar Sandoval */ 123805dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 123905dbe683SOmar Sandoval key.objectid = dirid; 124005dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 124105dbe683SOmar Sandoval key.offset = (u64)-1; 124205dbe683SOmar Sandoval 12430ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(fs_root, &key, path); 124405dbe683SOmar Sandoval if (ret < 0) { 124505dbe683SOmar Sandoval goto err; 124605dbe683SOmar Sandoval } else if (ret > 0) { 124705dbe683SOmar Sandoval ret = -ENOENT; 124805dbe683SOmar Sandoval goto err; 124905dbe683SOmar Sandoval } 125005dbe683SOmar Sandoval 125105dbe683SOmar Sandoval dirid = key.offset; 125205dbe683SOmar Sandoval 125305dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 125405dbe683SOmar Sandoval path->slots[0], 125505dbe683SOmar Sandoval struct btrfs_inode_ref); 125605dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 125705dbe683SOmar Sandoval inode_ref); 125805dbe683SOmar Sandoval ptr -= len + 1; 125905dbe683SOmar Sandoval if (ptr < name) { 126005dbe683SOmar Sandoval ret = -ENAMETOOLONG; 126105dbe683SOmar Sandoval goto err; 126205dbe683SOmar Sandoval } 126305dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 126405dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 126505dbe683SOmar Sandoval ptr[0] = '/'; 126605dbe683SOmar Sandoval btrfs_release_path(path); 126705dbe683SOmar Sandoval } 126800246528SJosef Bacik btrfs_put_root(fs_root); 12695168489aSJosef Bacik fs_root = NULL; 127005dbe683SOmar Sandoval } 127105dbe683SOmar Sandoval 127205dbe683SOmar Sandoval btrfs_free_path(path); 127305dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 127405dbe683SOmar Sandoval name[0] = '/'; 127505dbe683SOmar Sandoval name[1] = '\0'; 127605dbe683SOmar Sandoval } else { 127705dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 127805dbe683SOmar Sandoval } 127905dbe683SOmar Sandoval return name; 128005dbe683SOmar Sandoval 128105dbe683SOmar Sandoval err: 128200246528SJosef Bacik btrfs_put_root(fs_root); 128305dbe683SOmar Sandoval btrfs_free_path(path); 128405dbe683SOmar Sandoval kfree(name); 128505dbe683SOmar Sandoval return ERR_PTR(ret); 128605dbe683SOmar Sandoval } 128705dbe683SOmar Sandoval 128805dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 128905dbe683SOmar Sandoval { 129005dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 129173f73415SJosef Bacik struct btrfs_dir_item *di; 129273f73415SJosef Bacik struct btrfs_path *path; 129373f73415SJosef Bacik struct btrfs_key location; 129473f73415SJosef Bacik u64 dir_id; 129573f73415SJosef Bacik 129673f73415SJosef Bacik path = btrfs_alloc_path(); 129773f73415SJosef Bacik if (!path) 129805dbe683SOmar Sandoval return -ENOMEM; 129973f73415SJosef Bacik 130073f73415SJosef Bacik /* 130173f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 130273f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 130373f73415SJosef Bacik * to mount. 130473f73415SJosef Bacik */ 1305815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 130673f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1307b0839166SJulia Lawall if (IS_ERR(di)) { 1308b0839166SJulia Lawall btrfs_free_path(path); 130905dbe683SOmar Sandoval return PTR_ERR(di); 1310b0839166SJulia Lawall } 131173f73415SJosef Bacik if (!di) { 131273f73415SJosef Bacik /* 131373f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 131473f73415SJosef Bacik * it's always been there, but don't freak out, just try and 131505dbe683SOmar Sandoval * mount the top-level subvolume. 131673f73415SJosef Bacik */ 131773f73415SJosef Bacik btrfs_free_path(path); 131805dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 131905dbe683SOmar Sandoval return 0; 132073f73415SJosef Bacik } 132173f73415SJosef Bacik 132273f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 132373f73415SJosef Bacik btrfs_free_path(path); 132405dbe683SOmar Sandoval *objectid = location.objectid; 132505dbe683SOmar Sandoval return 0; 132673f73415SJosef Bacik } 132773f73415SJosef Bacik 13288a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 13298a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 133056e033a7SDavid Sterba void *data) 13312e635a27SChris Mason { 13322e635a27SChris Mason struct inode *inode; 1333815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 133439279cc3SChris Mason int err; 13352e635a27SChris Mason 13362e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 13372e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1338e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1339af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1340be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 134114605409SBoris Burkov #ifdef CONFIG_FS_VERITY 134214605409SBoris Burkov sb->s_vop = &btrfs_verityops; 134314605409SBoris Burkov #endif 13445103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 13452e635a27SChris Mason sb->s_time_gran = 1; 13460eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 13471751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 134849cf6f45SChris Ball #endif 1349357fdad0SMatthew Garrett sb->s_flags |= SB_I_VERSION; 1350da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 13519e11ceeeSJan Kara 13529e11ceeeSJan Kara err = super_setup_bdi(sb); 13539e11ceeeSJan Kara if (err) { 13549e11ceeeSJan Kara btrfs_err(fs_info, "super_setup_bdi failed"); 13559e11ceeeSJan Kara return err; 13569e11ceeeSJan Kara } 13579e11ceeeSJan Kara 1358ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1359ad2b2c80SAl Viro if (err) { 1360ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "open_ctree failed"); 1361ad2b2c80SAl Viro return err; 1362e20d96d6SChris Mason } 1363b888db2bSChris Mason 13640202e83fSDavid Sterba inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root); 13655d4f98a2SYan Zheng if (IS_ERR(inode)) { 13665d4f98a2SYan Zheng err = PTR_ERR(inode); 136739279cc3SChris Mason goto fail_close; 136839279cc3SChris Mason } 13692e635a27SChris Mason 137048fde701SAl Viro sb->s_root = d_make_root(inode); 137148fde701SAl Viro if (!sb->s_root) { 137239279cc3SChris Mason err = -ENOMEM; 137339279cc3SChris Mason goto fail_close; 13742e635a27SChris Mason } 137558176a96SJosef Bacik 13761751e8a6SLinus Torvalds sb->s_flags |= SB_ACTIVE; 13772e635a27SChris Mason return 0; 13782e635a27SChris Mason 137939279cc3SChris Mason fail_close: 13806bccf3abSJeff Mahoney close_ctree(fs_info); 1381d5719762SChris Mason return err; 1382d5719762SChris Mason } 1383d5719762SChris Mason 13846bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1385d5719762SChris Mason { 1386d5719762SChris Mason struct btrfs_trans_handle *trans; 1387815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1388815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1389df2ce34cSChris Mason 1390bc074524SJeff Mahoney trace_btrfs_sync_fs(fs_info, wait); 13911abe9b8aSliubo 1392d561c025SChris Mason if (!wait) { 1393815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1394df2ce34cSChris Mason return 0; 1395d561c025SChris Mason } 1396771ed689SChris Mason 13976374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 1398771ed689SChris Mason 1399d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 140060376ce4SJosef Bacik if (IS_ERR(trans)) { 1401354aa0fbSMiao Xie /* no transaction, don't bother */ 14026b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 14036b5fe46dSDavid Sterba /* 14046b5fe46dSDavid Sterba * Exit unless we have some pending changes 14056b5fe46dSDavid Sterba * that need to go through commit 14066b5fe46dSDavid Sterba */ 14076b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1408bd7de2c9SJosef Bacik return 0; 1409a53f4f8eSQu Wenruo /* 1410a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1411a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1412a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1413a53f4f8eSQu Wenruo * next commit after thawing. 1414a53f4f8eSQu Wenruo */ 1415a7e3c5f2SRakesh Pandit if (sb_start_write_trylock(sb)) 1416a7e3c5f2SRakesh Pandit sb_end_write(sb); 1417a53f4f8eSQu Wenruo else 1418a53f4f8eSQu Wenruo return 0; 14196b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 142060376ce4SJosef Bacik } 142198bd5c54SDavid Sterba if (IS_ERR(trans)) 142298bd5c54SDavid Sterba return PTR_ERR(trans); 14236b5fe46dSDavid Sterba } 14243a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 1425d5719762SChris Mason } 1426d5719762SChris Mason 1427ab0b4a3eSJosef Bacik static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed) 1428ab0b4a3eSJosef Bacik { 1429ab0b4a3eSJosef Bacik seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s); 1430ab0b4a3eSJosef Bacik *printed = true; 1431ab0b4a3eSJosef Bacik } 1432ab0b4a3eSJosef Bacik 143334c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1434a9572a15SEric Paris { 1435815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 14360f628c63SDavid Sterba const char *compress_type; 14373ef3959bSJosef Bacik const char *subvol_name; 1438ab0b4a3eSJosef Bacik bool printed = false; 1439a9572a15SEric Paris 14403cdde224SJeff Mahoney if (btrfs_test_opt(info, DEGRADED)) 1441a9572a15SEric Paris seq_puts(seq, ",degraded"); 14423cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) 1443a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 14443cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 1445a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 14463cdde224SJeff Mahoney if (btrfs_test_opt(info, NOBARRIER)) 1447a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 144895ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1449c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1450a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1451a9572a15SEric Paris num_online_cpus() + 2, 8)) 1452f7b885beSAnand Jain seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); 14533cdde224SJeff Mahoney if (btrfs_test_opt(info, COMPRESS)) { 14540f628c63SDavid Sterba compress_type = btrfs_compress_type2str(info->compress_type); 14553cdde224SJeff Mahoney if (btrfs_test_opt(info, FORCE_COMPRESS)) 1456200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1457200da64eSTsutomu Itoh else 1458200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1459f51d2b59SDavid Sterba if (info->compress_level) 1460fa4d885aSAdam Borowski seq_printf(seq, ":%d", info->compress_level); 1461200da64eSTsutomu Itoh } 14623cdde224SJeff Mahoney if (btrfs_test_opt(info, NOSSD)) 1463c289811cSChris Mason seq_puts(seq, ",nossd"); 14643cdde224SJeff Mahoney if (btrfs_test_opt(info, SSD_SPREAD)) 1465451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 14663cdde224SJeff Mahoney else if (btrfs_test_opt(info, SSD)) 1467a9572a15SEric Paris seq_puts(seq, ",ssd"); 14683cdde224SJeff Mahoney if (btrfs_test_opt(info, NOTREELOG)) 14696b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 14703cdde224SJeff Mahoney if (btrfs_test_opt(info, NOLOGREPLAY)) 1471ab0b4a3eSJosef Bacik print_rescue_option(seq, "nologreplay", &printed); 147268319c18SJosef Bacik if (btrfs_test_opt(info, USEBACKUPROOT)) 147368319c18SJosef Bacik print_rescue_option(seq, "usebackuproot", &printed); 147442437a63SJosef Bacik if (btrfs_test_opt(info, IGNOREBADROOTS)) 147542437a63SJosef Bacik print_rescue_option(seq, "ignorebadroots", &printed); 1476882dbe0cSJosef Bacik if (btrfs_test_opt(info, IGNOREDATACSUMS)) 1477882dbe0cSJosef Bacik print_rescue_option(seq, "ignoredatacsums", &printed); 14783cdde224SJeff Mahoney if (btrfs_test_opt(info, FLUSHONCOMMIT)) 14796b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 148046b27f50SDennis Zhou if (btrfs_test_opt(info, DISCARD_SYNC)) 148120a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 1482b0643e59SDennis Zhou if (btrfs_test_opt(info, DISCARD_ASYNC)) 1483b0643e59SDennis Zhou seq_puts(seq, ",discard=async"); 14841751e8a6SLinus Torvalds if (!(info->sb->s_flags & SB_POSIXACL)) 1485a9572a15SEric Paris seq_puts(seq, ",noacl"); 148604c41559SBoris Burkov if (btrfs_free_space_cache_v1_active(info)) 1487200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 148804c41559SBoris Burkov else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) 148970f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 149073bc1876SJosef Bacik else 14918965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 14923cdde224SJeff Mahoney if (btrfs_test_opt(info, RESCAN_UUID_TREE)) 1493f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 14943cdde224SJeff Mahoney if (btrfs_test_opt(info, CLEAR_CACHE)) 1495200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 14963cdde224SJeff Mahoney if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) 1497200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 14983cdde224SJeff Mahoney if (btrfs_test_opt(info, ENOSPC_DEBUG)) 14990942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 15003cdde224SJeff Mahoney if (btrfs_test_opt(info, AUTO_DEFRAG)) 15010942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 15023cdde224SJeff Mahoney if (btrfs_test_opt(info, SKIP_BALANCE)) 15039555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 15048507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 1505cbeaae4fSDavid Sterba if (btrfs_test_opt(info, CHECK_INTEGRITY_DATA)) 15068507d216SWang Shilong seq_puts(seq, ",check_int_data"); 15073cdde224SJeff Mahoney else if (btrfs_test_opt(info, CHECK_INTEGRITY)) 15088507d216SWang Shilong seq_puts(seq, ",check_int"); 15098507d216SWang Shilong if (info->check_integrity_print_mask) 15108507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 15118507d216SWang Shilong info->check_integrity_print_mask); 15128507d216SWang Shilong #endif 15138507d216SWang Shilong if (info->metadata_ratio) 1514764cb8b4SAnand Jain seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); 15153cdde224SJeff Mahoney if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) 15168c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 15178b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 1518d3740608SAnand Jain seq_printf(seq, ",commit=%u", info->commit_interval); 1519d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 15203cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_DATA)) 1521d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 15223cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_METADATA)) 1523d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1524d0bd4560SJosef Bacik #endif 1525fb592373SJosef Bacik if (btrfs_test_opt(info, REF_VERIFY)) 1526fb592373SJosef Bacik seq_puts(seq, ",ref_verify"); 1527c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1528c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 15293ef3959bSJosef Bacik subvol_name = btrfs_get_subvol_name_from_objectid(info, 15303ef3959bSJosef Bacik BTRFS_I(d_inode(dentry))->root->root_key.objectid); 15313ef3959bSJosef Bacik if (!IS_ERR(subvol_name)) { 1532c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 15333ef3959bSJosef Bacik seq_escape(seq, subvol_name, " \t\n\\"); 15343ef3959bSJosef Bacik kfree(subvol_name); 15353ef3959bSJosef Bacik } 1536a9572a15SEric Paris return 0; 1537a9572a15SEric Paris } 1538a9572a15SEric Paris 1539a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 15402e635a27SChris Mason { 1541815745cfSAl Viro struct btrfs_fs_info *p = data; 1542815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 15434b82d6e4SYan 1544815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 15454b82d6e4SYan } 15464b82d6e4SYan 1547450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1548450ba0eaSJosef Bacik { 15496de1d09dSAl Viro int err = set_anon_super(s, data); 15506de1d09dSAl Viro if (!err) 1551450ba0eaSJosef Bacik s->s_fs_info = data; 15526de1d09dSAl Viro return err; 1553450ba0eaSJosef Bacik } 1554450ba0eaSJosef Bacik 1555830c4adbSJosef Bacik /* 1556f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1557f9d9ef62SDavid Sterba */ 1558f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1559f9d9ef62SDavid Sterba { 1560f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1561f9d9ef62SDavid Sterba return 1; 1562f9d9ef62SDavid Sterba return 0; 1563f9d9ef62SDavid Sterba } 1564f9d9ef62SDavid Sterba 1565bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1566ae0bc863SAnand Jain struct vfsmount *mnt) 1567830c4adbSJosef Bacik { 1568830c4adbSJosef Bacik struct dentry *root; 1569fa330659SOmar Sandoval int ret; 1570830c4adbSJosef Bacik 157105dbe683SOmar Sandoval if (!subvol_name) { 157205dbe683SOmar Sandoval if (!subvol_objectid) { 157305dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 157405dbe683SOmar Sandoval &subvol_objectid); 157505dbe683SOmar Sandoval if (ret) { 157605dbe683SOmar Sandoval root = ERR_PTR(ret); 157705dbe683SOmar Sandoval goto out; 157805dbe683SOmar Sandoval } 157905dbe683SOmar Sandoval } 1580c0c907a4SMarcos Paulo de Souza subvol_name = btrfs_get_subvol_name_from_objectid( 1581c0c907a4SMarcos Paulo de Souza btrfs_sb(mnt->mnt_sb), subvol_objectid); 158205dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 158305dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 158405dbe683SOmar Sandoval subvol_name = NULL; 158505dbe683SOmar Sandoval goto out; 158605dbe683SOmar Sandoval } 158705dbe683SOmar Sandoval 158805dbe683SOmar Sandoval } 158905dbe683SOmar Sandoval 1590ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1591fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1592fa330659SOmar Sandoval mnt = NULL; 1593830c4adbSJosef Bacik 1594bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1595ea441d11SAl Viro struct super_block *s = root->d_sb; 1596ab8d0fc4SJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(s); 1597bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1598bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1599bb289b7bSOmar Sandoval 1600bb289b7bSOmar Sandoval ret = 0; 1601bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1602ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "'%s' is not a valid subvolume", 1603bb289b7bSOmar Sandoval subvol_name); 1604bb289b7bSOmar Sandoval ret = -EINVAL; 1605bb289b7bSOmar Sandoval } 1606bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 160705dbe683SOmar Sandoval /* 160805dbe683SOmar Sandoval * This will also catch a race condition where a 160905dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 161005dbe683SOmar Sandoval * another subvolume is renamed over the old location. 161105dbe683SOmar Sandoval */ 1612ab8d0fc4SJeff Mahoney btrfs_err(fs_info, 1613ab8d0fc4SJeff Mahoney "subvol '%s' does not match subvolid %llu", 1614bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1615bb289b7bSOmar Sandoval ret = -EINVAL; 1616bb289b7bSOmar Sandoval } 1617bb289b7bSOmar Sandoval if (ret) { 1618ea441d11SAl Viro dput(root); 1619bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1620ea441d11SAl Viro deactivate_locked_super(s); 1621bb289b7bSOmar Sandoval } 1622f9d9ef62SDavid Sterba } 1623f9d9ef62SDavid Sterba 1624fa330659SOmar Sandoval out: 1625fa330659SOmar Sandoval mntput(mnt); 1626fa330659SOmar Sandoval kfree(subvol_name); 1627830c4adbSJosef Bacik return root; 1628830c4adbSJosef Bacik } 1629450ba0eaSJosef Bacik 1630312c89fbSMisono, Tomohiro /* 1631312c89fbSMisono, Tomohiro * Find a superblock for the given device / mount point. 1632312c89fbSMisono, Tomohiro * 1633312c89fbSMisono, Tomohiro * Note: This is based on mount_bdev from fs/super.c with a few additions 1634312c89fbSMisono, Tomohiro * for multiple device setup. Make sure to keep it in sync. 1635312c89fbSMisono, Tomohiro */ 163672fa39f5SMisono, Tomohiro static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 163772fa39f5SMisono, Tomohiro int flags, const char *device_name, void *data) 163872fa39f5SMisono, Tomohiro { 163972fa39f5SMisono, Tomohiro struct block_device *bdev = NULL; 164072fa39f5SMisono, Tomohiro struct super_block *s; 164136350e95SGu Jinxiang struct btrfs_device *device = NULL; 164272fa39f5SMisono, Tomohiro struct btrfs_fs_devices *fs_devices = NULL; 164372fa39f5SMisono, Tomohiro struct btrfs_fs_info *fs_info = NULL; 1644204cc0ccSAl Viro void *new_sec_opts = NULL; 164572fa39f5SMisono, Tomohiro fmode_t mode = FMODE_READ; 164672fa39f5SMisono, Tomohiro int error = 0; 164772fa39f5SMisono, Tomohiro 164872fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY)) 164972fa39f5SMisono, Tomohiro mode |= FMODE_WRITE; 165072fa39f5SMisono, Tomohiro 165172fa39f5SMisono, Tomohiro if (data) { 1652a65001e8SAl Viro error = security_sb_eat_lsm_opts(data, &new_sec_opts); 165372fa39f5SMisono, Tomohiro if (error) 165472fa39f5SMisono, Tomohiro return ERR_PTR(error); 165572fa39f5SMisono, Tomohiro } 165672fa39f5SMisono, Tomohiro 165772fa39f5SMisono, Tomohiro /* 165872fa39f5SMisono, Tomohiro * Setup a dummy root and fs_info for test/set super. This is because 165972fa39f5SMisono, Tomohiro * we don't actually fill this stuff out until open_ctree, but we need 16608260edbaSJosef Bacik * then open_ctree will properly initialize the file system specific 16618260edbaSJosef Bacik * settings later. btrfs_init_fs_info initializes the static elements 16628260edbaSJosef Bacik * of the fs_info (locks and such) to make cleanup easier if we find a 16638260edbaSJosef Bacik * superblock with our given fs_devices later on at sget() time. 166472fa39f5SMisono, Tomohiro */ 1665a8fd1f71SJeff Mahoney fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 166672fa39f5SMisono, Tomohiro if (!fs_info) { 166772fa39f5SMisono, Tomohiro error = -ENOMEM; 166872fa39f5SMisono, Tomohiro goto error_sec_opts; 166972fa39f5SMisono, Tomohiro } 16708260edbaSJosef Bacik btrfs_init_fs_info(fs_info); 167172fa39f5SMisono, Tomohiro 167272fa39f5SMisono, Tomohiro fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 167372fa39f5SMisono, Tomohiro fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 167472fa39f5SMisono, Tomohiro if (!fs_info->super_copy || !fs_info->super_for_commit) { 167572fa39f5SMisono, Tomohiro error = -ENOMEM; 167672fa39f5SMisono, Tomohiro goto error_fs_info; 167772fa39f5SMisono, Tomohiro } 167872fa39f5SMisono, Tomohiro 1679f5194e34SDavid Sterba mutex_lock(&uuid_mutex); 1680fa59f27cSAnand Jain error = btrfs_parse_device_options(data, mode, fs_type); 168181ffd56bSDavid Sterba if (error) { 1682399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 1683399f7f4cSDavid Sterba goto error_fs_info; 168481ffd56bSDavid Sterba } 1685399f7f4cSDavid Sterba 168636350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, mode, fs_type); 168736350e95SGu Jinxiang if (IS_ERR(device)) { 1688399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 168936350e95SGu Jinxiang error = PTR_ERR(device); 1690399f7f4cSDavid Sterba goto error_fs_info; 169181ffd56bSDavid Sterba } 1692399f7f4cSDavid Sterba 169336350e95SGu Jinxiang fs_devices = device->fs_devices; 1694399f7f4cSDavid Sterba fs_info->fs_devices = fs_devices; 1695399f7f4cSDavid Sterba 169672fa39f5SMisono, Tomohiro error = btrfs_open_devices(fs_devices, mode, fs_type); 1697f5194e34SDavid Sterba mutex_unlock(&uuid_mutex); 169872fa39f5SMisono, Tomohiro if (error) 169972fa39f5SMisono, Tomohiro goto error_fs_info; 170072fa39f5SMisono, Tomohiro 170172fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 170272fa39f5SMisono, Tomohiro error = -EACCES; 170372fa39f5SMisono, Tomohiro goto error_close_devices; 170472fa39f5SMisono, Tomohiro } 170572fa39f5SMisono, Tomohiro 1706d24fa5c1SAnand Jain bdev = fs_devices->latest_dev->bdev; 170772fa39f5SMisono, Tomohiro s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 170872fa39f5SMisono, Tomohiro fs_info); 170972fa39f5SMisono, Tomohiro if (IS_ERR(s)) { 171072fa39f5SMisono, Tomohiro error = PTR_ERR(s); 171172fa39f5SMisono, Tomohiro goto error_close_devices; 171272fa39f5SMisono, Tomohiro } 171372fa39f5SMisono, Tomohiro 171472fa39f5SMisono, Tomohiro if (s->s_root) { 171572fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 17160d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 171772fa39f5SMisono, Tomohiro if ((flags ^ s->s_flags) & SB_RDONLY) 171872fa39f5SMisono, Tomohiro error = -EBUSY; 171972fa39f5SMisono, Tomohiro } else { 172072fa39f5SMisono, Tomohiro snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 172172fa39f5SMisono, Tomohiro btrfs_sb(s)->bdev_holder = fs_type; 17229b4e675aSDavid Sterba if (!strstr(crc32c_impl(), "generic")) 17239b4e675aSDavid Sterba set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); 172472fa39f5SMisono, Tomohiro error = btrfs_fill_super(s, fs_devices, data); 172572fa39f5SMisono, Tomohiro } 1726a65001e8SAl Viro if (!error) 1727204cc0ccSAl Viro error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL); 1728a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 172972fa39f5SMisono, Tomohiro if (error) { 173072fa39f5SMisono, Tomohiro deactivate_locked_super(s); 1731a65001e8SAl Viro return ERR_PTR(error); 173272fa39f5SMisono, Tomohiro } 173372fa39f5SMisono, Tomohiro 173472fa39f5SMisono, Tomohiro return dget(s->s_root); 173572fa39f5SMisono, Tomohiro 173672fa39f5SMisono, Tomohiro error_close_devices: 173772fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 173872fa39f5SMisono, Tomohiro error_fs_info: 17390d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 174072fa39f5SMisono, Tomohiro error_sec_opts: 174172fa39f5SMisono, Tomohiro security_free_mnt_opts(&new_sec_opts); 174272fa39f5SMisono, Tomohiro return ERR_PTR(error); 174372fa39f5SMisono, Tomohiro } 1744312c89fbSMisono, Tomohiro 1745edf24abeSChristoph Hellwig /* 1746312c89fbSMisono, Tomohiro * Mount function which is called by VFS layer. 1747edf24abeSChristoph Hellwig * 1748312c89fbSMisono, Tomohiro * In order to allow mounting a subvolume directly, btrfs uses mount_subtree() 1749312c89fbSMisono, Tomohiro * which needs vfsmount* of device's root (/). This means device's root has to 1750312c89fbSMisono, Tomohiro * be mounted internally in any case. 1751312c89fbSMisono, Tomohiro * 1752312c89fbSMisono, Tomohiro * Operation flow: 1753312c89fbSMisono, Tomohiro * 1. Parse subvol id related options for later use in mount_subvol(). 1754312c89fbSMisono, Tomohiro * 1755312c89fbSMisono, Tomohiro * 2. Mount device's root (/) by calling vfs_kern_mount(). 1756312c89fbSMisono, Tomohiro * 1757312c89fbSMisono, Tomohiro * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the 1758312c89fbSMisono, Tomohiro * first place. In order to avoid calling btrfs_mount() again, we use 1759312c89fbSMisono, Tomohiro * different file_system_type which is not registered to VFS by 1760312c89fbSMisono, Tomohiro * register_filesystem() (btrfs_root_fs_type). As a result, 1761312c89fbSMisono, Tomohiro * btrfs_mount_root() is called. The return value will be used by 1762312c89fbSMisono, Tomohiro * mount_subtree() in mount_subvol(). 1763312c89fbSMisono, Tomohiro * 1764312c89fbSMisono, Tomohiro * 3. Call mount_subvol() to get the dentry of subvolume. Since there is 1765312c89fbSMisono, Tomohiro * "btrfs subvolume set-default", mount_subvol() is called always. 1766edf24abeSChristoph Hellwig */ 1767061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1768306e16ceSDavid Sterba const char *device_name, void *data) 17694b82d6e4SYan { 1770312c89fbSMisono, Tomohiro struct vfsmount *mnt_root; 1771312c89fbSMisono, Tomohiro struct dentry *root; 177273f73415SJosef Bacik char *subvol_name = NULL; 177373f73415SJosef Bacik u64 subvol_objectid = 0; 17744b82d6e4SYan int error = 0; 17754b82d6e4SYan 177693b9bcdfSGu Jinxiang error = btrfs_parse_subvol_options(data, &subvol_name, 177793b9bcdfSGu Jinxiang &subvol_objectid); 1778f23c8af8SIlya Dryomov if (error) { 1779f23c8af8SIlya Dryomov kfree(subvol_name); 1780061dbc6bSAl Viro return ERR_PTR(error); 1781f23c8af8SIlya Dryomov } 1782edf24abeSChristoph Hellwig 1783312c89fbSMisono, Tomohiro /* mount device's root (/) */ 1784312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); 1785312c89fbSMisono, Tomohiro if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { 1786312c89fbSMisono, Tomohiro if (flags & SB_RDONLY) { 1787312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1788312c89fbSMisono, Tomohiro flags & ~SB_RDONLY, device_name, data); 17894b82d6e4SYan } else { 1790312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1791312c89fbSMisono, Tomohiro flags | SB_RDONLY, device_name, data); 1792312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1793312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1794532b618bSEric W. Biederman kfree(subvol_name); 1795312c89fbSMisono, Tomohiro goto out; 1796f667aef6SQu Wenruo } 1797f667aef6SQu Wenruo 1798312c89fbSMisono, Tomohiro down_write(&mnt_root->mnt_sb->s_umount); 1799312c89fbSMisono, Tomohiro error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); 1800312c89fbSMisono, Tomohiro up_write(&mnt_root->mnt_sb->s_umount); 1801312c89fbSMisono, Tomohiro if (error < 0) { 1802312c89fbSMisono, Tomohiro root = ERR_PTR(error); 1803312c89fbSMisono, Tomohiro mntput(mnt_root); 1804532b618bSEric W. Biederman kfree(subvol_name); 1805312c89fbSMisono, Tomohiro goto out; 1806312c89fbSMisono, Tomohiro } 1807312c89fbSMisono, Tomohiro } 1808312c89fbSMisono, Tomohiro } 1809312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1810312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1811532b618bSEric W. Biederman kfree(subvol_name); 1812312c89fbSMisono, Tomohiro goto out; 1813f667aef6SQu Wenruo } 18144b82d6e4SYan 1815312c89fbSMisono, Tomohiro /* mount_subvol() will free subvol_name and mnt_root */ 1816ae0bc863SAnand Jain root = mount_subvol(subvol_name, subvol_objectid, mnt_root); 18174b82d6e4SYan 1818312c89fbSMisono, Tomohiro out: 1819312c89fbSMisono, Tomohiro return root; 18204b82d6e4SYan } 18212e635a27SChris Mason 18220d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 1823f7b885beSAnand Jain u32 new_pool_size, u32 old_pool_size) 18240d2450abSSergei Trofimovich { 18250d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 18260d2450abSSergei Trofimovich return; 18270d2450abSSergei Trofimovich 18280d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 18290d2450abSSergei Trofimovich 1830efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 18310d2450abSSergei Trofimovich old_pool_size, new_pool_size); 18320d2450abSSergei Trofimovich 18335cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1834afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1835e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1836fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1837fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1838fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1839fccb5d86SQu Wenruo new_pool_size); 1840fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1841fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 18425b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 18430339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1844ff023aacSStefan Behrens new_pool_size); 18450d2450abSSergei Trofimovich } 18460d2450abSSergei Trofimovich 1847f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1848f42a34b2SMiao Xie unsigned long old_opts, int flags) 1849f42a34b2SMiao Xie { 1850dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1851dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 18521751e8a6SLinus Torvalds (flags & SB_RDONLY))) { 1853dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1854dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1855dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 18561751e8a6SLinus Torvalds if (flags & SB_RDONLY) 1857dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1858dc81cdc5SMiao Xie } 1859dc81cdc5SMiao Xie } 1860dc81cdc5SMiao Xie 1861dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1862dc81cdc5SMiao Xie unsigned long old_opts) 1863dc81cdc5SMiao Xie { 186494846229SBoris Burkov const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE); 186594846229SBoris Burkov 1866dc81cdc5SMiao Xie /* 1867180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1868180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1869dc81cdc5SMiao Xie */ 1870dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1871bc98a42cSDavid Howells (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { 1872dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1873dc81cdc5SMiao Xie } 1874dc81cdc5SMiao Xie 1875b0643e59SDennis Zhou /* If we toggled discard async */ 1876b0643e59SDennis Zhou if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && 1877b0643e59SDennis Zhou btrfs_test_opt(fs_info, DISCARD_ASYNC)) 1878b0643e59SDennis Zhou btrfs_discard_resume(fs_info); 1879b0643e59SDennis Zhou else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && 1880b0643e59SDennis Zhou !btrfs_test_opt(fs_info, DISCARD_ASYNC)) 1881b0643e59SDennis Zhou btrfs_discard_cleanup(fs_info); 188294846229SBoris Burkov 188394846229SBoris Burkov /* If we toggled space cache */ 188494846229SBoris Burkov if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) 188594846229SBoris Burkov btrfs_set_free_space_cache_v1_active(fs_info, cache_opt); 1886dc81cdc5SMiao Xie } 1887dc81cdc5SMiao Xie 1888c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1889c146afadSYan Zheng { 1890815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 189149b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 189249b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 189349b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 189449b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 1895f7b885beSAnand Jain u32 old_thread_pool_size = fs_info->thread_pool_size; 1896d612ac59SAnand Jain u32 old_metadata_ratio = fs_info->metadata_ratio; 1897c146afadSYan Zheng int ret; 1898c146afadSYan Zheng 189902b9984dSTheodore Ts'o sync_filesystem(sb); 190088c4703fSJohannes Thumshirn set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1901dc81cdc5SMiao Xie 1902f667aef6SQu Wenruo if (data) { 1903204cc0ccSAl Viro void *new_sec_opts = NULL; 1904f667aef6SQu Wenruo 1905a65001e8SAl Viro ret = security_sb_eat_lsm_opts(data, &new_sec_opts); 1906a65001e8SAl Viro if (!ret) 1907204cc0ccSAl Viro ret = security_sb_remount(sb, new_sec_opts); 1908a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 1909f667aef6SQu Wenruo if (ret) 1910f667aef6SQu Wenruo goto restore; 1911f667aef6SQu Wenruo } 1912f667aef6SQu Wenruo 19132ff7e61eSJeff Mahoney ret = btrfs_parse_options(fs_info, data, *flags); 1914891f41cbSChengguang Xu if (ret) 191549b25e05SJeff Mahoney goto restore; 1916b288052eSChris Mason 1917f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 19180d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 19190d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 19200d2450abSSergei Trofimovich 1921c55a4319SBoris Burkov if ((bool)btrfs_test_opt(fs_info, FREE_SPACE_TREE) != 1922c55a4319SBoris Burkov (bool)btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && 19232838d255SBoris Burkov (!sb_rdonly(sb) || (*flags & SB_RDONLY))) { 19242838d255SBoris Burkov btrfs_warn(fs_info, 19252838d255SBoris Burkov "remount supports changing free space tree only from ro to rw"); 19262838d255SBoris Burkov /* Make sure free space cache options match the state on disk */ 19272838d255SBoris Burkov if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { 19282838d255SBoris Burkov btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE); 19292838d255SBoris Burkov btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE); 19302838d255SBoris Burkov } 19312838d255SBoris Burkov if (btrfs_free_space_cache_v1_active(fs_info)) { 19322838d255SBoris Burkov btrfs_clear_opt(fs_info->mount_opt, FREE_SPACE_TREE); 19332838d255SBoris Burkov btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE); 19342838d255SBoris Burkov } 19352838d255SBoris Burkov } 19362838d255SBoris Burkov 19371751e8a6SLinus Torvalds if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1938dc81cdc5SMiao Xie goto out; 1939c146afadSYan Zheng 19401751e8a6SLinus Torvalds if (*flags & SB_RDONLY) { 19418dabb742SStefan Behrens /* 19428dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 19438dabb742SStefan Behrens * the filesystem is busy. 19448dabb742SStefan Behrens */ 194521c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 194657056740SJosef Bacik cancel_work_sync(&fs_info->async_data_reclaim_work); 1947361c093dSStefan Behrens 1948b0643e59SDennis Zhou btrfs_discard_cleanup(fs_info); 1949b0643e59SDennis Zhou 1950361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1951361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1952361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1953361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1954361c093dSStefan Behrens 1955a0a1db70SFilipe Manana btrfs_set_sb_rdonly(sb); 1956c146afadSYan Zheng 1957e44163e1SJeff Mahoney /* 19581751e8a6SLinus Torvalds * Setting SB_RDONLY will put the cleaner thread to 1959e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1960e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1961e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1962e44163e1SJeff Mahoney * unless we clean them up here. 1963e44163e1SJeff Mahoney */ 1964e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1965e44163e1SJeff Mahoney 1966a0a1db70SFilipe Manana /* 1967a0a1db70SFilipe Manana * The cleaner task could be already running before we set the 1968a0a1db70SFilipe Manana * flag BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock). 1969a0a1db70SFilipe Manana * We must make sure that after we finish the remount, i.e. after 1970a0a1db70SFilipe Manana * we call btrfs_commit_super(), the cleaner can no longer start 1971a0a1db70SFilipe Manana * a transaction - either because it was dropping a dead root, 1972a0a1db70SFilipe Manana * running delayed iputs or deleting an unused block group (the 1973a0a1db70SFilipe Manana * cleaner picked a block group from the list of unused block 1974a0a1db70SFilipe Manana * groups before we were able to in the previous call to 1975a0a1db70SFilipe Manana * btrfs_delete_unused_bgs()). 1976a0a1db70SFilipe Manana */ 1977a0a1db70SFilipe Manana wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING, 1978a0a1db70SFilipe Manana TASK_UNINTERRUPTIBLE); 1979a0a1db70SFilipe Manana 1980a8cc263eSFilipe Manana /* 1981a8cc263eSFilipe Manana * We've set the superblock to RO mode, so we might have made 1982a8cc263eSFilipe Manana * the cleaner task sleep without running all pending delayed 1983a8cc263eSFilipe Manana * iputs. Go through all the delayed iputs here, so that if an 1984a8cc263eSFilipe Manana * unmount happens without remounting RW we don't end up at 1985a8cc263eSFilipe Manana * finishing close_ctree() with a non-empty list of delayed 1986a8cc263eSFilipe Manana * iputs. 1987a8cc263eSFilipe Manana */ 1988a8cc263eSFilipe Manana btrfs_run_delayed_iputs(fs_info); 1989a8cc263eSFilipe Manana 19908dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 19918dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1992061594efSMiao Xie btrfs_pause_balance(fs_info); 19938dabb742SStefan Behrens 1994cb13eea3SFilipe Manana /* 1995cb13eea3SFilipe Manana * Pause the qgroup rescan worker if it is running. We don't want 1996cb13eea3SFilipe Manana * it to be still running after we are in RO mode, as after that, 1997cb13eea3SFilipe Manana * by the time we unmount, it might have left a transaction open, 1998cb13eea3SFilipe Manana * so we would leak the transaction and/or crash. 1999cb13eea3SFilipe Manana */ 2000cb13eea3SFilipe Manana btrfs_qgroup_wait_for_completion(fs_info, false); 2001cb13eea3SFilipe Manana 20026bccf3abSJeff Mahoney ret = btrfs_commit_super(fs_info); 200349b25e05SJeff Mahoney if (ret) 200449b25e05SJeff Mahoney goto restore; 2005c146afadSYan Zheng } else { 200684961539SJosef Bacik if (BTRFS_FS_ERROR(fs_info)) { 20076ef3de9cSDavid Sterba btrfs_err(fs_info, 2008efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 20096ef3de9cSDavid Sterba ret = -EINVAL; 20106ef3de9cSDavid Sterba goto restore; 20116ef3de9cSDavid Sterba } 20128a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 201349b25e05SJeff Mahoney ret = -EACCES; 201449b25e05SJeff Mahoney goto restore; 20158a3db184SSergei Trofimovich } 20162b82032cSYan Zheng 20176528b99dSAnand Jain if (!btrfs_check_rw_degradable(fs_info, NULL)) { 2018efe120a0SFrank Holton btrfs_warn(fs_info, 201952042d8eSAndrea Gelmini "too many missing devices, writable remount is not allowed"); 2020292fd7fcSStefan Behrens ret = -EACCES; 2021292fd7fcSStefan Behrens goto restore; 2022292fd7fcSStefan Behrens } 2023292fd7fcSStefan Behrens 20248a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 202510a3a3edSDavid Sterba btrfs_warn(fs_info, 202610a3a3edSDavid Sterba "mount required to replay tree-log, cannot remount read-write"); 202749b25e05SJeff Mahoney ret = -EINVAL; 202849b25e05SJeff Mahoney goto restore; 20298a3db184SSergei Trofimovich } 2030c146afadSYan Zheng 203144c0ca21SBoris Burkov /* 203244c0ca21SBoris Burkov * NOTE: when remounting with a change that does writes, don't 203344c0ca21SBoris Burkov * put it anywhere above this point, as we are not sure to be 203444c0ca21SBoris Burkov * safe to write until we pass the above checks. 203544c0ca21SBoris Burkov */ 203644c0ca21SBoris Burkov ret = btrfs_start_pre_rw_mount(fs_info); 203749b25e05SJeff Mahoney if (ret) 203849b25e05SJeff Mahoney goto restore; 2039c146afadSYan Zheng 2040a0a1db70SFilipe Manana btrfs_clear_sb_rdonly(sb); 204190c711abSZygo Blaxell 2042afcdd129SJosef Bacik set_bit(BTRFS_FS_OPEN, &fs_info->flags); 2043c146afadSYan Zheng } 2044dc81cdc5SMiao Xie out: 2045faa00889SJosef Bacik /* 2046faa00889SJosef Bacik * We need to set SB_I_VERSION here otherwise it'll get cleared by VFS, 2047faa00889SJosef Bacik * since the absence of the flag means it can be toggled off by remount. 2048faa00889SJosef Bacik */ 2049faa00889SJosef Bacik *flags |= SB_I_VERSION; 2050faa00889SJosef Bacik 20512c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 2052dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 20538cd29088SBoris Burkov btrfs_clear_oneshot_options(fs_info); 205488c4703fSJohannes Thumshirn clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 205588c4703fSJohannes Thumshirn 2056c146afadSYan Zheng return 0; 205749b25e05SJeff Mahoney 205849b25e05SJeff Mahoney restore: 20591751e8a6SLinus Torvalds /* We've hit an error - don't reset SB_RDONLY */ 2060bc98a42cSDavid Howells if (sb_rdonly(sb)) 20611751e8a6SLinus Torvalds old_flags |= SB_RDONLY; 2062a0a1db70SFilipe Manana if (!(old_flags & SB_RDONLY)) 2063a0a1db70SFilipe Manana clear_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state); 206449b25e05SJeff Mahoney sb->s_flags = old_flags; 206549b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 206649b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 206749b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 20680d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 20690d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 207049b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 2071dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 207288c4703fSJohannes Thumshirn clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 207388c4703fSJohannes Thumshirn 207449b25e05SJeff Mahoney return ret; 2075c146afadSYan Zheng } 2076c146afadSYan Zheng 2077bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 2078214cc184SDavid Sterba static int btrfs_cmp_device_free_bytes(const void *a, const void *b) 2079bcd53741SArne Jansen { 2080214cc184SDavid Sterba const struct btrfs_device_info *dev_info1 = a; 2081214cc184SDavid Sterba const struct btrfs_device_info *dev_info2 = b; 2082214cc184SDavid Sterba 2083214cc184SDavid Sterba if (dev_info1->max_avail > dev_info2->max_avail) 2084bcd53741SArne Jansen return -1; 2085214cc184SDavid Sterba else if (dev_info1->max_avail < dev_info2->max_avail) 2086bcd53741SArne Jansen return 1; 2087bcd53741SArne Jansen return 0; 2088bcd53741SArne Jansen } 2089bcd53741SArne Jansen 2090bcd53741SArne Jansen /* 2091bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 2092bcd53741SArne Jansen * is stored.(Descending Sort) 2093bcd53741SArne Jansen */ 2094bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 2095bcd53741SArne Jansen struct btrfs_device_info *devices, 2096bcd53741SArne Jansen size_t nr_devices) 2097bcd53741SArne Jansen { 2098bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 2099bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 2100bcd53741SArne Jansen } 2101bcd53741SArne Jansen 21026d07bcecSMiao Xie /* 21036d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 21046d07bcecSMiao Xie * file data. 21056d07bcecSMiao Xie */ 21067e17916bSArnd Bergmann static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, 21076bccf3abSJeff Mahoney u64 *free_bytes) 21086d07bcecSMiao Xie { 21096d07bcecSMiao Xie struct btrfs_device_info *devices_info; 21106d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 21116d07bcecSMiao Xie struct btrfs_device *device; 21126d07bcecSMiao Xie u64 type; 21136d07bcecSMiao Xie u64 avail_space; 21146d07bcecSMiao Xie u64 min_stripe_size; 2115559ca6eaSNikolay Borisov int num_stripes = 1; 21166d07bcecSMiao Xie int i = 0, nr_devices; 21174f080f57SDavid Sterba const struct btrfs_raid_attr *rattr; 21186d07bcecSMiao Xie 21197e33fd99SJosef Bacik /* 212001327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 21217e33fd99SJosef Bacik * enough for our purposes. 21227e33fd99SJosef Bacik */ 2123b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 21247e33fd99SJosef Bacik if (!nr_devices) { 21257e33fd99SJosef Bacik smp_mb(); 21267e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 21277e33fd99SJosef Bacik ASSERT(nr_devices); 21287e33fd99SJosef Bacik if (!nr_devices) { 21297e33fd99SJosef Bacik *free_bytes = 0; 21307e33fd99SJosef Bacik return 0; 21317e33fd99SJosef Bacik } 21327e33fd99SJosef Bacik } 21336d07bcecSMiao Xie 2134d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 21356a44517dSDavid Sterba GFP_KERNEL); 21366d07bcecSMiao Xie if (!devices_info) 21376d07bcecSMiao Xie return -ENOMEM; 21386d07bcecSMiao Xie 213901327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 21401b86826dSJeff Mahoney type = btrfs_data_alloc_profile(fs_info); 21414f080f57SDavid Sterba rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)]; 21424f080f57SDavid Sterba 2143e1ea2beeSDavid Sterba if (type & BTRFS_BLOCK_GROUP_RAID0) 214439fb26c3SMiao Xie num_stripes = nr_devices; 2145e1ea2beeSDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1) 214639fb26c3SMiao Xie num_stripes = 2; 214747e6f742SDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1C3) 214847e6f742SDavid Sterba num_stripes = 3; 21498d6fac00SDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1C4) 21508d6fac00SDavid Sterba num_stripes = 4; 2151e1ea2beeSDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID10) 215239fb26c3SMiao Xie num_stripes = 4; 21536d07bcecSMiao Xie 21544f080f57SDavid Sterba /* Adjust for more than 1 stripe per device */ 21554f080f57SDavid Sterba min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN; 21566d07bcecSMiao Xie 21577e33fd99SJosef Bacik rcu_read_lock(); 21587e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2159e12c9621SAnand Jain if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 2160e12c9621SAnand Jain &device->dev_state) || 2161401e29c1SAnand Jain !device->bdev || 2162401e29c1SAnand Jain test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) 21636d07bcecSMiao Xie continue; 21646d07bcecSMiao Xie 21657e33fd99SJosef Bacik if (i >= nr_devices) 21667e33fd99SJosef Bacik break; 21677e33fd99SJosef Bacik 21686d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 21696d07bcecSMiao Xie 21706d07bcecSMiao Xie /* align with stripe_len */ 2171559ca6eaSNikolay Borisov avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN); 21726d07bcecSMiao Xie 21736d07bcecSMiao Xie /* 217401327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 21756d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 21766d07bcecSMiao Xie * allocation. 2177559ca6eaSNikolay Borisov * 2178559ca6eaSNikolay Borisov * This ensures we have at least min_stripe_size free space 2179559ca6eaSNikolay Borisov * after excluding 1MB. 21806d07bcecSMiao Xie */ 2181559ca6eaSNikolay Borisov if (avail_space <= SZ_1M + min_stripe_size) 21826d07bcecSMiao Xie continue; 21836d07bcecSMiao Xie 2184559ca6eaSNikolay Borisov avail_space -= SZ_1M; 2185559ca6eaSNikolay Borisov 21866d07bcecSMiao Xie devices_info[i].dev = device; 21876d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 21886d07bcecSMiao Xie 21896d07bcecSMiao Xie i++; 21906d07bcecSMiao Xie } 21917e33fd99SJosef Bacik rcu_read_unlock(); 21926d07bcecSMiao Xie 21936d07bcecSMiao Xie nr_devices = i; 21946d07bcecSMiao Xie 21956d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 21966d07bcecSMiao Xie 21976d07bcecSMiao Xie i = nr_devices - 1; 21986d07bcecSMiao Xie avail_space = 0; 2199559ca6eaSNikolay Borisov while (nr_devices >= rattr->devs_min) { 2200559ca6eaSNikolay Borisov num_stripes = min(num_stripes, nr_devices); 220139fb26c3SMiao Xie 22026d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 22036d07bcecSMiao Xie int j; 22046d07bcecSMiao Xie u64 alloc_size; 22056d07bcecSMiao Xie 220639fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 22076d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 220839fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 22096d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 22106d07bcecSMiao Xie } 22116d07bcecSMiao Xie i--; 22126d07bcecSMiao Xie nr_devices--; 22136d07bcecSMiao Xie } 22146d07bcecSMiao Xie 22156d07bcecSMiao Xie kfree(devices_info); 22166d07bcecSMiao Xie *free_bytes = avail_space; 22176d07bcecSMiao Xie return 0; 22186d07bcecSMiao Xie } 22196d07bcecSMiao Xie 2220ba7b6e62SDavid Sterba /* 2221ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2222ba7b6e62SDavid Sterba * 2223ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2224ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2225ba7b6e62SDavid Sterba * 2226ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 22270d0c71b3SDavid Sterba * algorithm that respects the device sizes and order of allocations. This is 22280d0c71b3SDavid Sterba * a close approximation of the actual use but there are other factors that may 22290d0c71b3SDavid Sterba * change the result (like a new metadata chunk). 2230ba7b6e62SDavid Sterba * 2231ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2232ba7b6e62SDavid Sterba */ 22338fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 22348fd17795SChris Mason { 2235815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2236815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2237bd4d1088SJosef Bacik struct btrfs_space_info *found; 2238bd4d1088SJosef Bacik u64 total_used = 0; 22396d07bcecSMiao Xie u64 total_free_data = 0; 2240ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2241265fdfa6SDavid Sterba u32 bits = fs_info->sectorsize_bits; 2242de37aa51SNikolay Borisov __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid; 2243ba7b6e62SDavid Sterba unsigned factor = 1; 2244ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 22456d07bcecSMiao Xie int ret; 2246ca8a51b3SDavid Sterba u64 thresh = 0; 2247ae02d1bdSLuis de Bethencourt int mixed = 0; 22488fd17795SChris Mason 224972804905SJosef Bacik list_for_each_entry(found, &fs_info->space_info, list) { 22506d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2251ba7b6e62SDavid Sterba int i; 2252ba7b6e62SDavid Sterba 22536d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 22546d07bcecSMiao Xie total_free_data -= 22556d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2256ba7b6e62SDavid Sterba 2257ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 225846df06b8SDavid Sterba if (!list_empty(&found->block_groups[i])) 225946df06b8SDavid Sterba factor = btrfs_bg_type_to_factor( 226046df06b8SDavid Sterba btrfs_raid_array[i].bg_flag); 2261ba7b6e62SDavid Sterba } 22626d07bcecSMiao Xie } 2263ae02d1bdSLuis de Bethencourt 2264ae02d1bdSLuis de Bethencourt /* 2265ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2266ae02d1bdSLuis de Bethencourt */ 2267ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2268ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2269ae02d1bdSLuis de Bethencourt mixed = 1; 2270ae02d1bdSLuis de Bethencourt else 2271ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2272ae02d1bdSLuis de Bethencourt found->disk_used; 2273ae02d1bdSLuis de Bethencourt } 22746d07bcecSMiao Xie 2275b742bb82SYan, Zheng total_used += found->disk_used; 227689a55897SJosef Bacik } 2277ba7b6e62SDavid Sterba 2278ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2279ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2280ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2281ba7b6e62SDavid Sterba 2282ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2283ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 228441b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 228541b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2286ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 228741b34accSLuis de Bethencourt else 228841b34accSLuis de Bethencourt buf->f_bfree = 0; 2289ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2290ba7b6e62SDavid Sterba 22910d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 22926bccf3abSJeff Mahoney ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); 22937e33fd99SJosef Bacik if (ret) 22946d07bcecSMiao Xie return ret; 2295ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 22966d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2297d397712bSChris Mason 2298ca8a51b3SDavid Sterba /* 2299ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2300ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2301ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2302ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2303ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2304ca8a51b3SDavid Sterba * 2305ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2306ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2307ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2308ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2309ca8a51b3SDavid Sterba * way around. 2310ca8a51b3SDavid Sterba */ 2311d4417e22SNikolay Borisov thresh = SZ_4M; 2312ca8a51b3SDavid Sterba 2313d55966c4SJosef Bacik /* 2314d55966c4SJosef Bacik * We only want to claim there's no available space if we can no longer 2315d55966c4SJosef Bacik * allocate chunks for our metadata profile and our global reserve will 2316d55966c4SJosef Bacik * not fit in the free metadata space. If we aren't ->full then we 2317d55966c4SJosef Bacik * still can allocate chunks and thus are fine using the currently 2318d55966c4SJosef Bacik * calculated f_bavail. 2319d55966c4SJosef Bacik */ 2320d55966c4SJosef Bacik if (!mixed && block_rsv->space_info->full && 2321d55966c4SJosef Bacik total_free_meta - thresh < block_rsv->size) 2322ca8a51b3SDavid Sterba buf->f_bavail = 0; 2323ca8a51b3SDavid Sterba 2324ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2325ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2326ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2327ba7b6e62SDavid Sterba 23289d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 23299d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 23309d03632eSDavid Woodhouse on a big-endian or little-endian host */ 23319d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 23329d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 233332d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 23344fd786e6SMisono Tomohiro buf->f_fsid.val[0] ^= 23354fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32; 23364fd786e6SMisono Tomohiro buf->f_fsid.val[1] ^= 23374fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid; 233832d48fa1SDavid Woodhouse 23398fd17795SChris Mason return 0; 23408fd17795SChris Mason } 2341b5133862SChris Mason 2342aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2343aea52e19SAl Viro { 2344815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2345aea52e19SAl Viro kill_anon_super(sb); 23460d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 2347aea52e19SAl Viro } 2348aea52e19SAl Viro 23492e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 23502e635a27SChris Mason .owner = THIS_MODULE, 23512e635a27SChris Mason .name = "btrfs", 2352061dbc6bSAl Viro .mount = btrfs_mount, 2353aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2354f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 23552e635a27SChris Mason }; 235672fa39f5SMisono, Tomohiro 235772fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type = { 235872fa39f5SMisono, Tomohiro .owner = THIS_MODULE, 235972fa39f5SMisono, Tomohiro .name = "btrfs", 236072fa39f5SMisono, Tomohiro .mount = btrfs_mount_root, 236172fa39f5SMisono, Tomohiro .kill_sb = btrfs_kill_super, 23625b9b26f5SChristian Brauner .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP, 236372fa39f5SMisono, Tomohiro }; 236472fa39f5SMisono, Tomohiro 23657f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2366a9218f6bSChris Mason 2367d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2368d8620958STom Van Braeckel { 2369d8620958STom Van Braeckel /* 2370d8620958STom Van Braeckel * The control file's private_data is used to hold the 2371d8620958STom Van Braeckel * transaction when it is started and is used to keep 2372d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2373d8620958STom Van Braeckel */ 2374d8620958STom Van Braeckel file->private_data = NULL; 2375d8620958STom Van Braeckel return 0; 2376d8620958STom Van Braeckel } 2377d8620958STom Van Braeckel 2378d352ac68SChris Mason /* 2379cfe953c8SSu Yue * Used by /dev/btrfs-control for devices ioctls. 2380d352ac68SChris Mason */ 23818a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 23828a4b83ccSChris Mason unsigned long arg) 23838a4b83ccSChris Mason { 23848a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 238536350e95SGu Jinxiang struct btrfs_device *device = NULL; 2386*16cab91aSAnand Jain dev_t devt = 0; 2387c071fcfdSChris Mason int ret = -ENOTTY; 23888a4b83ccSChris Mason 2389e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2390e441d54dSChris Mason return -EPERM; 2391e441d54dSChris Mason 2392dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2393dae7b665SLi Zefan if (IS_ERR(vol)) 2394dae7b665SLi Zefan return PTR_ERR(vol); 2395f505754fSFilipe Manana vol->name[BTRFS_PATH_NAME_MAX] = '\0'; 2396c071fcfdSChris Mason 23978a4b83ccSChris Mason switch (cmd) { 23988a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 2399899f9307SDavid Sterba mutex_lock(&uuid_mutex); 240036350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 240136350e95SGu Jinxiang &btrfs_root_fs_type); 240236350e95SGu Jinxiang ret = PTR_ERR_OR_ZERO(device); 2403899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 24048a4b83ccSChris Mason break; 2405228a73abSAnand Jain case BTRFS_IOC_FORGET_DEV: 2406*16cab91aSAnand Jain if (vol->name[0] != 0) { 2407*16cab91aSAnand Jain ret = lookup_bdev(vol->name, &devt); 2408*16cab91aSAnand Jain if (ret) 2409*16cab91aSAnand Jain break; 2410*16cab91aSAnand Jain } 2411*16cab91aSAnand Jain ret = btrfs_forget_devices(devt); 2412228a73abSAnand Jain break; 241302db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 2414899f9307SDavid Sterba mutex_lock(&uuid_mutex); 241536350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 241636350e95SGu Jinxiang &btrfs_root_fs_type); 241736350e95SGu Jinxiang if (IS_ERR(device)) { 2418899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 241936350e95SGu Jinxiang ret = PTR_ERR(device); 242002db0844SJosef Bacik break; 2421899f9307SDavid Sterba } 242236350e95SGu Jinxiang ret = !(device->fs_devices->num_devices == 242336350e95SGu Jinxiang device->fs_devices->total_devices); 2424899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 242502db0844SJosef Bacik break; 2426c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2427d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2428c5868f83SDavid Sterba break; 24298a4b83ccSChris Mason } 2430dae7b665SLi Zefan 24318a4b83ccSChris Mason kfree(vol); 2432f819d837SLinda Knippers return ret; 24338a4b83ccSChris Mason } 24348a4b83ccSChris Mason 24350176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2436ed0dab6bSYan { 2437354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 24380b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 24390b246afaSJeff Mahoney struct btrfs_root *root = fs_info->tree_root; 2440354aa0fbSMiao Xie 2441fac03c8dSDavid Sterba set_bit(BTRFS_FS_FROZEN, &fs_info->flags); 24429e7cc91aSWang Xiaoguang /* 24439e7cc91aSWang Xiaoguang * We don't need a barrier here, we'll wait for any transaction that 24449e7cc91aSWang Xiaoguang * could be in progress on other threads (and do delayed iputs that 24459e7cc91aSWang Xiaoguang * we want to avoid on a frozen filesystem), or do the commit 24469e7cc91aSWang Xiaoguang * ourselves. 24479e7cc91aSWang Xiaoguang */ 2448d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2449354aa0fbSMiao Xie if (IS_ERR(trans)) { 2450354aa0fbSMiao Xie /* no transaction, don't bother */ 2451354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 24520176260fSLinus Torvalds return 0; 2453354aa0fbSMiao Xie return PTR_ERR(trans); 2454354aa0fbSMiao Xie } 24553a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 2456ed0dab6bSYan } 2457ed0dab6bSYan 24589e7cc91aSWang Xiaoguang static int btrfs_unfreeze(struct super_block *sb) 24599e7cc91aSWang Xiaoguang { 2460fac03c8dSDavid Sterba struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2461fac03c8dSDavid Sterba 2462fac03c8dSDavid Sterba clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); 24639e7cc91aSWang Xiaoguang return 0; 24649e7cc91aSWang Xiaoguang } 24659e7cc91aSWang Xiaoguang 24669c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 24679c5085c1SJosef Bacik { 24689c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 24699c5085c1SJosef Bacik 247088c14590SDavid Sterba /* 24716605fd2fSAnand Jain * There should be always a valid pointer in latest_dev, it may be stale 24726605fd2fSAnand Jain * for a short moment in case it's being deleted but still valid until 24736605fd2fSAnand Jain * the end of RCU grace period. 247488c14590SDavid Sterba */ 247588c14590SDavid Sterba rcu_read_lock(); 24766605fd2fSAnand Jain seq_escape(m, rcu_str_deref(fs_info->fs_devices->latest_dev->name), " \t\n\\"); 247788c14590SDavid Sterba rcu_read_unlock(); 24786605fd2fSAnand Jain 24799c5085c1SJosef Bacik return 0; 24809c5085c1SJosef Bacik } 24819c5085c1SJosef Bacik 2482b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 248376dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2484bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2485e20d96d6SChris Mason .put_super = btrfs_put_super, 2486d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2487a9572a15SEric Paris .show_options = btrfs_show_options, 24889c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 24892c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 24902c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 249126602cabSAl Viro .free_inode = btrfs_free_inode, 24928fd17795SChris Mason .statfs = btrfs_statfs, 2493c146afadSYan Zheng .remount_fs = btrfs_remount, 24940176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 24959e7cc91aSWang Xiaoguang .unfreeze_fs = btrfs_unfreeze, 2496e20d96d6SChris Mason }; 2497a9218f6bSChris Mason 2498a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2499d8620958STom Van Braeckel .open = btrfs_control_open, 2500a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 25011832f2d8SArnd Bergmann .compat_ioctl = compat_ptr_ioctl, 2502a9218f6bSChris Mason .owner = THIS_MODULE, 25036038f373SArnd Bergmann .llseek = noop_llseek, 2504a9218f6bSChris Mason }; 2505a9218f6bSChris Mason 2506a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2507578454ffSKay Sievers .minor = BTRFS_MINOR, 2508a9218f6bSChris Mason .name = "btrfs-control", 2509a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2510a9218f6bSChris Mason }; 2511a9218f6bSChris Mason 2512578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2513578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2514578454ffSKay Sievers 2515f5c29bd9SLiu Bo static int __init btrfs_interface_init(void) 2516a9218f6bSChris Mason { 2517a9218f6bSChris Mason return misc_register(&btrfs_misc); 2518a9218f6bSChris Mason } 2519a9218f6bSChris Mason 2520e67c718bSDavid Sterba static __cold void btrfs_interface_exit(void) 2521a9218f6bSChris Mason { 2522f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2523a9218f6bSChris Mason } 2524a9218f6bSChris Mason 2525f5c29bd9SLiu Bo static void __init btrfs_print_mod_info(void) 252685965600SDavid Sterba { 2527edf57cbfSBart Van Assche static const char options[] = "" 252885965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 252985965600SDavid Sterba ", debug=on" 253085965600SDavid Sterba #endif 253179556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 253279556c3dSStefan Behrens ", assert=on" 253379556c3dSStefan Behrens #endif 253485965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 253585965600SDavid Sterba ", integrity-checker=on" 253685965600SDavid Sterba #endif 2537fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2538fb592373SJosef Bacik ", ref-verify=on" 2539fb592373SJosef Bacik #endif 25405b316468SNaohiro Aota #ifdef CONFIG_BLK_DEV_ZONED 25415b316468SNaohiro Aota ", zoned=yes" 25425b316468SNaohiro Aota #else 25435b316468SNaohiro Aota ", zoned=no" 25445b316468SNaohiro Aota #endif 2545ea3dc7d2SDavid Sterba #ifdef CONFIG_FS_VERITY 2546ea3dc7d2SDavid Sterba ", fsverity=yes" 2547ea3dc7d2SDavid Sterba #else 2548ea3dc7d2SDavid Sterba ", fsverity=no" 2549ea3dc7d2SDavid Sterba #endif 2550edf57cbfSBart Van Assche ; 2551edf57cbfSBart Van Assche pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); 255285965600SDavid Sterba } 255385965600SDavid Sterba 25542e635a27SChris Mason static int __init init_btrfs_fs(void) 25552e635a27SChris Mason { 25562c90e5d6SChris Mason int err; 255758176a96SJosef Bacik 255863541927SFilipe David Borba Manana btrfs_props_init(); 255963541927SFilipe David Borba Manana 256058176a96SJosef Bacik err = btrfs_init_sysfs(); 256158176a96SJosef Bacik if (err) 25629678c543SNikolay Borisov return err; 256358176a96SJosef Bacik 2564143bede5SJeff Mahoney btrfs_init_compress(); 2565d1310b2eSChris Mason 2566261507a0SLi Zefan err = btrfs_init_cachep(); 2567261507a0SLi Zefan if (err) 2568261507a0SLi Zefan goto free_compress; 2569261507a0SLi Zefan 2570d1310b2eSChris Mason err = extent_io_init(); 25712f4cbe64SWyatt Banks if (err) 25722f4cbe64SWyatt Banks goto free_cachep; 25732f4cbe64SWyatt Banks 25746f0d04f8SJosef Bacik err = extent_state_cache_init(); 2575d1310b2eSChris Mason if (err) 2576d1310b2eSChris Mason goto free_extent_io; 2577d1310b2eSChris Mason 25786f0d04f8SJosef Bacik err = extent_map_init(); 25796f0d04f8SJosef Bacik if (err) 25806f0d04f8SJosef Bacik goto free_extent_state_cache; 25816f0d04f8SJosef Bacik 25826352b91dSMiao Xie err = ordered_data_init(); 25832f4cbe64SWyatt Banks if (err) 25842f4cbe64SWyatt Banks goto free_extent_map; 2585c8b97818SChris Mason 25866352b91dSMiao Xie err = btrfs_delayed_inode_init(); 25876352b91dSMiao Xie if (err) 25886352b91dSMiao Xie goto free_ordered_data; 25896352b91dSMiao Xie 25909247f317SMiao Xie err = btrfs_auto_defrag_init(); 259116cdcec7SMiao Xie if (err) 259216cdcec7SMiao Xie goto free_delayed_inode; 259316cdcec7SMiao Xie 259478a6184aSMiao Xie err = btrfs_delayed_ref_init(); 25959247f317SMiao Xie if (err) 25969247f317SMiao Xie goto free_auto_defrag; 25979247f317SMiao Xie 2598b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2599b9e9a6cbSWang Shilong if (err) 2600af13b492SDavid Sterba goto free_delayed_ref; 2601b9e9a6cbSWang Shilong 260297eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 260378a6184aSMiao Xie if (err) 2604af13b492SDavid Sterba goto free_prelim_ref; 260578a6184aSMiao Xie 260697eb6b69SDavid Sterba err = btrfs_interface_init(); 260797eb6b69SDavid Sterba if (err) 260897eb6b69SDavid Sterba goto free_end_io_wq; 260997eb6b69SDavid Sterba 26108ae1af3cSAnand Jain btrfs_print_mod_info(); 2611dc11dd5dSJosef Bacik 2612dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2613dc11dd5dSJosef Bacik if (err) 2614dc11dd5dSJosef Bacik goto unregister_ioctl; 2615dc11dd5dSJosef Bacik 2616dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2617dc11dd5dSJosef Bacik if (err) 2618dc11dd5dSJosef Bacik goto unregister_ioctl; 261974255aa0SJosef Bacik 26202f4cbe64SWyatt Banks return 0; 26212f4cbe64SWyatt Banks 2622a9218f6bSChris Mason unregister_ioctl: 2623a9218f6bSChris Mason btrfs_interface_exit(); 262497eb6b69SDavid Sterba free_end_io_wq: 262597eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2626b9e9a6cbSWang Shilong free_prelim_ref: 2627b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 262878a6184aSMiao Xie free_delayed_ref: 262978a6184aSMiao Xie btrfs_delayed_ref_exit(); 26309247f317SMiao Xie free_auto_defrag: 26319247f317SMiao Xie btrfs_auto_defrag_exit(); 263216cdcec7SMiao Xie free_delayed_inode: 263316cdcec7SMiao Xie btrfs_delayed_inode_exit(); 26346352b91dSMiao Xie free_ordered_data: 26356352b91dSMiao Xie ordered_data_exit(); 26362f4cbe64SWyatt Banks free_extent_map: 26372f4cbe64SWyatt Banks extent_map_exit(); 26386f0d04f8SJosef Bacik free_extent_state_cache: 26396f0d04f8SJosef Bacik extent_state_cache_exit(); 2640d1310b2eSChris Mason free_extent_io: 2641d1310b2eSChris Mason extent_io_exit(); 26422f4cbe64SWyatt Banks free_cachep: 26432f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2644261507a0SLi Zefan free_compress: 2645261507a0SLi Zefan btrfs_exit_compress(); 26462f4cbe64SWyatt Banks btrfs_exit_sysfs(); 26479678c543SNikolay Borisov 26482c90e5d6SChris Mason return err; 26492e635a27SChris Mason } 26502e635a27SChris Mason 26512e635a27SChris Mason static void __exit exit_btrfs_fs(void) 26522e635a27SChris Mason { 265339279cc3SChris Mason btrfs_destroy_cachep(); 265478a6184aSMiao Xie btrfs_delayed_ref_exit(); 26559247f317SMiao Xie btrfs_auto_defrag_exit(); 265616cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2657b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 26586352b91dSMiao Xie ordered_data_exit(); 2659a52d9a80SChris Mason extent_map_exit(); 26606f0d04f8SJosef Bacik extent_state_cache_exit(); 2661d1310b2eSChris Mason extent_io_exit(); 2662a9218f6bSChris Mason btrfs_interface_exit(); 26635ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 26642e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 266558176a96SJosef Bacik btrfs_exit_sysfs(); 26668a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2667261507a0SLi Zefan btrfs_exit_compress(); 26682e635a27SChris Mason } 26692e635a27SChris Mason 267060efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 26712e635a27SChris Mason module_exit(exit_btrfs_fs) 26722e635a27SChris Mason 26732e635a27SChris Mason MODULE_LICENSE("GPL"); 2674d5178578SJohannes Thumshirn MODULE_SOFTDEP("pre: crc32c"); 26753951e7f0SJohannes Thumshirn MODULE_SOFTDEP("pre: xxhash64"); 26763831bf00SJohannes Thumshirn MODULE_SOFTDEP("pre: sha256"); 2677352ae07bSDavid Sterba MODULE_SOFTDEP("pre: blake2b-256"); 2678