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: 864*63cd070dSJosef Bacik /* 865*63cd070dSJosef Bacik * We already set FREE_SPACE_TREE above because we have 866*63cd070dSJosef Bacik * compat_ro(FREE_SPACE_TREE) set, and we aren't going 867*63cd070dSJosef Bacik * to allow v1 to be set for extent tree v2, simply 868*63cd070dSJosef Bacik * ignore this setting if we're extent tree v2. 869*63cd070dSJosef Bacik */ 870*63cd070dSJosef Bacik if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) 871*63cd070dSJosef Bacik break; 87270f6d82eSOmar Sandoval if (token == Opt_space_cache || 87370f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 8740b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 87570f6d82eSOmar Sandoval FREE_SPACE_TREE); 8763cdde224SJeff Mahoney btrfs_set_and_info(info, SPACE_CACHE, 87707802534SQu Wenruo "enabling disk space caching"); 87870f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 8790b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 88070f6d82eSOmar Sandoval SPACE_CACHE); 8810b246afaSJeff Mahoney btrfs_set_and_info(info, FREE_SPACE_TREE, 88270f6d82eSOmar Sandoval "enabling free space tree"); 88370f6d82eSOmar Sandoval } else { 88470f6d82eSOmar Sandoval ret = -EINVAL; 88570f6d82eSOmar Sandoval goto out; 88670f6d82eSOmar Sandoval } 8870de90876SJosef Bacik break; 888f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 889f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 890f420ee1eSStefan Behrens break; 89173bc1876SJosef Bacik case Opt_no_space_cache: 892*63cd070dSJosef Bacik /* 893*63cd070dSJosef Bacik * We cannot operate without the free space tree with 894*63cd070dSJosef Bacik * extent tree v2, ignore this option. 895*63cd070dSJosef Bacik */ 896*63cd070dSJosef Bacik if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) 897*63cd070dSJosef Bacik break; 8983cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) { 8990b246afaSJeff Mahoney btrfs_clear_and_info(info, SPACE_CACHE, 90007802534SQu Wenruo "disabling disk space caching"); 90170f6d82eSOmar Sandoval } 9023cdde224SJeff Mahoney if (btrfs_test_opt(info, FREE_SPACE_TREE)) { 9030b246afaSJeff Mahoney btrfs_clear_and_info(info, FREE_SPACE_TREE, 90470f6d82eSOmar Sandoval "disabling free space tree"); 90570f6d82eSOmar Sandoval } 90673bc1876SJosef Bacik break; 9074b9465cbSChris Mason case Opt_inode_cache: 9083818aea2SQu Wenruo case Opt_noinode_cache: 9095297199aSNikolay Borisov btrfs_warn(info, 9105297199aSNikolay Borisov "the 'inode_cache' option is deprecated and has no effect since 5.11"); 9114b9465cbSChris Mason break; 91288c2ba3bSJosef Bacik case Opt_clear_cache: 913*63cd070dSJosef Bacik /* 914*63cd070dSJosef Bacik * We cannot clear the free space tree with extent tree 915*63cd070dSJosef Bacik * v2, ignore this option. 916*63cd070dSJosef Bacik */ 917*63cd070dSJosef Bacik if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) 918*63cd070dSJosef Bacik break; 9193cdde224SJeff Mahoney btrfs_set_and_info(info, CLEAR_CACHE, 92007802534SQu Wenruo "force clearing of disk cache"); 9210af3d00bSJosef Bacik break; 9224260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 9234260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 9244260f7c7SSage Weil break; 92591435650SChris Mason case Opt_enospc_debug: 92691435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 92791435650SChris Mason break; 92853036293SQu Wenruo case Opt_noenospc_debug: 92953036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 93053036293SQu Wenruo break; 9314cb5300bSChris Mason case Opt_defrag: 9323cdde224SJeff Mahoney btrfs_set_and_info(info, AUTO_DEFRAG, 93307802534SQu Wenruo "enabling auto defrag"); 9344cb5300bSChris Mason break; 935fc0ca9afSQu Wenruo case Opt_nodefrag: 9363cdde224SJeff Mahoney btrfs_clear_and_info(info, AUTO_DEFRAG, 93707802534SQu Wenruo "disabling auto defrag"); 938fc0ca9afSQu Wenruo break; 939af31f5e5SChris Mason case Opt_recovery: 9408dcddfa0SQu Wenruo case Opt_usebackuproot: 94174ef0018SQu Wenruo btrfs_warn(info, 94274ef0018SQu Wenruo "'%s' is deprecated, use 'rescue=usebackuproot' instead", 94374ef0018SQu Wenruo token == Opt_recovery ? "recovery" : 94474ef0018SQu Wenruo "usebackuproot"); 9450b246afaSJeff Mahoney btrfs_info(info, 9468dcddfa0SQu Wenruo "trying to use backup root at mount time"); 9478dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 948af31f5e5SChris Mason break; 9499555c6c1SIlya Dryomov case Opt_skip_balance: 9509555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 9519555c6c1SIlya Dryomov break; 95221adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 95321adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 9540b246afaSJeff Mahoney btrfs_info(info, 955efe120a0SFrank Holton "enabling check integrity including extent data"); 956cbeaae4fSDavid Sterba btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY_DATA); 95721adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 95821adbd5cSStefan Behrens break; 95921adbd5cSStefan Behrens case Opt_check_integrity: 9600b246afaSJeff Mahoney btrfs_info(info, "enabling check integrity"); 96121adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 96221adbd5cSStefan Behrens break; 96321adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 9642c334e87SWang Shilong ret = match_int(&args[0], &intarg); 96502453bdeSAnand Jain if (ret) 9662c334e87SWang Shilong goto out; 96721adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 96802453bdeSAnand Jain btrfs_info(info, "check_integrity_print_mask 0x%x", 96921adbd5cSStefan Behrens info->check_integrity_print_mask); 97021adbd5cSStefan Behrens break; 97121adbd5cSStefan Behrens #else 97221adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 97321adbd5cSStefan Behrens case Opt_check_integrity: 97421adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 9750b246afaSJeff Mahoney btrfs_err(info, 976efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 97721adbd5cSStefan Behrens ret = -EINVAL; 97821adbd5cSStefan Behrens goto out; 97921adbd5cSStefan Behrens #endif 9808c342930SJeff Mahoney case Opt_fatal_errors: 9818c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 9828c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 9838c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 9848c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 9858c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 9868c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 9878c342930SJeff Mahoney else { 9888c342930SJeff Mahoney ret = -EINVAL; 9898c342930SJeff Mahoney goto out; 9908c342930SJeff Mahoney } 9918c342930SJeff Mahoney break; 9928b87dc17SDavid Sterba case Opt_commit_interval: 9938b87dc17SDavid Sterba intarg = 0; 9948b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 995d3740608SAnand Jain if (ret) 9968b87dc17SDavid Sterba goto out; 997d3740608SAnand Jain if (intarg == 0) { 998d3740608SAnand Jain btrfs_info(info, 999d3740608SAnand Jain "using default commit interval %us", 1000d3740608SAnand Jain BTRFS_DEFAULT_COMMIT_INTERVAL); 1001d3740608SAnand Jain intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; 1002d3740608SAnand Jain } else if (intarg > 300) { 1003d3740608SAnand Jain btrfs_warn(info, "excessive commit interval %d", 10048b87dc17SDavid Sterba intarg); 10058b87dc17SDavid Sterba } 10068b87dc17SDavid Sterba info->commit_interval = intarg; 10078b87dc17SDavid Sterba break; 100874ef0018SQu Wenruo case Opt_rescue: 100974ef0018SQu Wenruo ret = parse_rescue_options(info, args[0].from); 101074ef0018SQu Wenruo if (ret < 0) 101174ef0018SQu Wenruo goto out; 101274ef0018SQu Wenruo break; 1013d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 1014d0bd4560SJosef Bacik case Opt_fragment_all: 10150b246afaSJeff Mahoney btrfs_info(info, "fragmenting all space"); 1016d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 1017d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 1018d0bd4560SJosef Bacik break; 1019d0bd4560SJosef Bacik case Opt_fragment_metadata: 10200b246afaSJeff Mahoney btrfs_info(info, "fragmenting metadata"); 1021d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 1022d0bd4560SJosef Bacik FRAGMENT_METADATA); 1023d0bd4560SJosef Bacik break; 1024d0bd4560SJosef Bacik case Opt_fragment_data: 10250b246afaSJeff Mahoney btrfs_info(info, "fragmenting data"); 1026d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 1027d0bd4560SJosef Bacik break; 1028d0bd4560SJosef Bacik #endif 1029fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 1030fb592373SJosef Bacik case Opt_ref_verify: 1031fb592373SJosef Bacik btrfs_info(info, "doing ref verification"); 1032fb592373SJosef Bacik btrfs_set_opt(info->mount_opt, REF_VERIFY); 1033fb592373SJosef Bacik break; 1034fb592373SJosef Bacik #endif 1035a7a3f7caSSage Weil case Opt_err: 10367e8f19e5SDavid Sterba btrfs_err(info, "unrecognized mount option '%s'", p); 1037a7a3f7caSSage Weil ret = -EINVAL; 1038a7a3f7caSSage Weil goto out; 103995e05289SChris Mason default: 1040be20aa9dSChris Mason break; 104195e05289SChris Mason } 104295e05289SChris Mason } 104396da0919SQu Wenruo check: 1044d70bf748SJosef Bacik /* We're read-only, don't have to check. */ 1045d70bf748SJosef Bacik if (new_flags & SB_RDONLY) 1046d70bf748SJosef Bacik goto out; 1047d70bf748SJosef Bacik 104842437a63SJosef Bacik if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || 1049882dbe0cSJosef Bacik check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || 1050882dbe0cSJosef Bacik check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")) 105196da0919SQu Wenruo ret = -EINVAL; 1052a7a3f7caSSage Weil out: 10530b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && 10543cdde224SJeff Mahoney !btrfs_test_opt(info, FREE_SPACE_TREE) && 10553cdde224SJeff Mahoney !btrfs_test_opt(info, CLEAR_CACHE)) { 10560b246afaSJeff Mahoney btrfs_err(info, "cannot disable free space tree"); 105770f6d82eSOmar Sandoval ret = -EINVAL; 105870f6d82eSOmar Sandoval 105970f6d82eSOmar Sandoval } 10605d1ab66cSNaohiro Aota if (!ret) 10615d1ab66cSNaohiro Aota ret = btrfs_check_mountopts_zoned(info); 10623cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, SPACE_CACHE)) 10630b246afaSJeff Mahoney btrfs_info(info, "disk space caching is enabled"); 10643cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) 10650b246afaSJeff Mahoney btrfs_info(info, "using free space tree"); 1066a7a3f7caSSage Weil return ret; 1067edf24abeSChristoph Hellwig } 1068edf24abeSChristoph Hellwig 1069edf24abeSChristoph Hellwig /* 1070edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 1071edf24abeSChristoph Hellwig * 1072edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 1073edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 1074edf24abeSChristoph Hellwig */ 1075fa59f27cSAnand Jain static int btrfs_parse_device_options(const char *options, fmode_t flags, 1076d64dcbd1SGu Jinxiang void *holder) 1077edf24abeSChristoph Hellwig { 1078edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 107983c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 108036350e95SGu Jinxiang struct btrfs_device *device = NULL; 1081d7407606SMisono, Tomohiro int error = 0; 1082d7407606SMisono, Tomohiro 10835139cff5SDavid Sterba lockdep_assert_held(&uuid_mutex); 10845139cff5SDavid Sterba 1085d7407606SMisono, Tomohiro if (!options) 1086d7407606SMisono, Tomohiro return 0; 1087d7407606SMisono, Tomohiro 1088d7407606SMisono, Tomohiro /* 1089d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because btrfs_parse_options 1090d7407606SMisono, Tomohiro * gets called later 1091d7407606SMisono, Tomohiro */ 1092d7407606SMisono, Tomohiro opts = kstrdup(options, GFP_KERNEL); 1093d7407606SMisono, Tomohiro if (!opts) 1094d7407606SMisono, Tomohiro return -ENOMEM; 1095d7407606SMisono, Tomohiro orig = opts; 1096d7407606SMisono, Tomohiro 1097d7407606SMisono, Tomohiro while ((p = strsep(&opts, ",")) != NULL) { 1098d7407606SMisono, Tomohiro int token; 1099d7407606SMisono, Tomohiro 1100d7407606SMisono, Tomohiro if (!*p) 1101d7407606SMisono, Tomohiro continue; 1102d7407606SMisono, Tomohiro 1103d7407606SMisono, Tomohiro token = match_token(p, tokens, args); 1104d7407606SMisono, Tomohiro if (token == Opt_device) { 1105d7407606SMisono, Tomohiro device_name = match_strdup(&args[0]); 1106d7407606SMisono, Tomohiro if (!device_name) { 1107d7407606SMisono, Tomohiro error = -ENOMEM; 1108d7407606SMisono, Tomohiro goto out; 1109d7407606SMisono, Tomohiro } 111036350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, flags, 111136350e95SGu Jinxiang holder); 1112d7407606SMisono, Tomohiro kfree(device_name); 111336350e95SGu Jinxiang if (IS_ERR(device)) { 111436350e95SGu Jinxiang error = PTR_ERR(device); 1115d7407606SMisono, Tomohiro goto out; 1116d7407606SMisono, Tomohiro } 1117d7407606SMisono, Tomohiro } 111836350e95SGu Jinxiang } 1119d7407606SMisono, Tomohiro 1120d7407606SMisono, Tomohiro out: 1121d7407606SMisono, Tomohiro kfree(orig); 1122d7407606SMisono, Tomohiro return error; 1123d7407606SMisono, Tomohiro } 1124d7407606SMisono, Tomohiro 1125d7407606SMisono, Tomohiro /* 1126d7407606SMisono, Tomohiro * Parse mount options that are related to subvolume id 1127d7407606SMisono, Tomohiro * 1128d7407606SMisono, Tomohiro * The value is later passed to mount_subvol() 1129d7407606SMisono, Tomohiro */ 113093b9bcdfSGu Jinxiang static int btrfs_parse_subvol_options(const char *options, char **subvol_name, 113193b9bcdfSGu Jinxiang u64 *subvol_objectid) 1132d7407606SMisono, Tomohiro { 1133d7407606SMisono, Tomohiro substring_t args[MAX_OPT_ARGS]; 1134d7407606SMisono, Tomohiro char *opts, *orig, *p; 1135edf24abeSChristoph Hellwig int error = 0; 1136ccb0e7d1SAnand Jain u64 subvolid; 1137edf24abeSChristoph Hellwig 1138edf24abeSChristoph Hellwig if (!options) 1139830c4adbSJosef Bacik return 0; 1140edf24abeSChristoph Hellwig 1141edf24abeSChristoph Hellwig /* 1142d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because 1143fa59f27cSAnand Jain * btrfs_parse_device_options gets called later 1144edf24abeSChristoph Hellwig */ 1145edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 1146edf24abeSChristoph Hellwig if (!opts) 1147edf24abeSChristoph Hellwig return -ENOMEM; 11483f3d0bc0STero Roponen orig = opts; 1149edf24abeSChristoph Hellwig 1150edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 1151edf24abeSChristoph Hellwig int token; 1152edf24abeSChristoph Hellwig if (!*p) 1153edf24abeSChristoph Hellwig continue; 1154edf24abeSChristoph Hellwig 1155edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 1156edf24abeSChristoph Hellwig switch (token) { 1157edf24abeSChristoph Hellwig case Opt_subvol: 1158a90e8b6fSIlya Dryomov kfree(*subvol_name); 1159edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 11602c334e87SWang Shilong if (!*subvol_name) { 11612c334e87SWang Shilong error = -ENOMEM; 11622c334e87SWang Shilong goto out; 11632c334e87SWang Shilong } 1164edf24abeSChristoph Hellwig break; 116573f73415SJosef Bacik case Opt_subvolid: 1166ccb0e7d1SAnand Jain error = match_u64(&args[0], &subvolid); 1167ccb0e7d1SAnand Jain if (error) 11682c334e87SWang Shilong goto out; 1169ccb0e7d1SAnand Jain 1170ccb0e7d1SAnand Jain /* we want the original fs_tree */ 1171ccb0e7d1SAnand Jain if (subvolid == 0) 1172ccb0e7d1SAnand Jain subvolid = BTRFS_FS_TREE_OBJECTID; 1173ccb0e7d1SAnand Jain 1174ccb0e7d1SAnand Jain *subvol_objectid = subvolid; 117573f73415SJosef Bacik break; 1176edf24abeSChristoph Hellwig default: 1177edf24abeSChristoph Hellwig break; 1178edf24abeSChristoph Hellwig } 1179edf24abeSChristoph Hellwig } 1180edf24abeSChristoph Hellwig 1181edf24abeSChristoph Hellwig out: 1182830c4adbSJosef Bacik kfree(orig); 1183edf24abeSChristoph Hellwig return error; 118495e05289SChris Mason } 118595e05289SChris Mason 1186c0c907a4SMarcos Paulo de Souza char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 118773f73415SJosef Bacik u64 subvol_objectid) 118873f73415SJosef Bacik { 1189815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 11905168489aSJosef Bacik struct btrfs_root *fs_root = NULL; 119105dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 119205dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 119305dbe683SOmar Sandoval struct btrfs_key key; 119405dbe683SOmar Sandoval struct btrfs_path *path = NULL; 119505dbe683SOmar Sandoval char *name = NULL, *ptr; 119605dbe683SOmar Sandoval u64 dirid; 119705dbe683SOmar Sandoval int len; 119805dbe683SOmar Sandoval int ret; 119905dbe683SOmar Sandoval 120005dbe683SOmar Sandoval path = btrfs_alloc_path(); 120105dbe683SOmar Sandoval if (!path) { 120205dbe683SOmar Sandoval ret = -ENOMEM; 120305dbe683SOmar Sandoval goto err; 120405dbe683SOmar Sandoval } 120505dbe683SOmar Sandoval 12063ec83621SDavid Sterba name = kmalloc(PATH_MAX, GFP_KERNEL); 120705dbe683SOmar Sandoval if (!name) { 120805dbe683SOmar Sandoval ret = -ENOMEM; 120905dbe683SOmar Sandoval goto err; 121005dbe683SOmar Sandoval } 121105dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 121205dbe683SOmar Sandoval ptr[0] = '\0'; 121305dbe683SOmar Sandoval 121405dbe683SOmar Sandoval /* 121505dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 121605dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 121705dbe683SOmar Sandoval */ 121805dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 121905dbe683SOmar Sandoval key.objectid = subvol_objectid; 122005dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 122105dbe683SOmar Sandoval key.offset = (u64)-1; 122205dbe683SOmar Sandoval 12230ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(root, &key, path); 122405dbe683SOmar Sandoval if (ret < 0) { 122505dbe683SOmar Sandoval goto err; 122605dbe683SOmar Sandoval } else if (ret > 0) { 122705dbe683SOmar Sandoval ret = -ENOENT; 122805dbe683SOmar Sandoval goto err; 122905dbe683SOmar Sandoval } 123005dbe683SOmar Sandoval 123105dbe683SOmar Sandoval subvol_objectid = key.offset; 123205dbe683SOmar Sandoval 123305dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 123405dbe683SOmar Sandoval struct btrfs_root_ref); 123505dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 123605dbe683SOmar Sandoval ptr -= len + 1; 123705dbe683SOmar Sandoval if (ptr < name) { 123805dbe683SOmar Sandoval ret = -ENAMETOOLONG; 123905dbe683SOmar Sandoval goto err; 124005dbe683SOmar Sandoval } 124105dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 124205dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 124305dbe683SOmar Sandoval ptr[0] = '/'; 124405dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 124505dbe683SOmar Sandoval btrfs_release_path(path); 124605dbe683SOmar Sandoval 124756e9357aSDavid Sterba fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true); 124805dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 124905dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 12505168489aSJosef Bacik fs_root = NULL; 12515168489aSJosef Bacik goto err; 12525168489aSJosef Bacik } 125305dbe683SOmar Sandoval 125405dbe683SOmar Sandoval /* 125505dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 125605dbe683SOmar Sandoval * root directory. 125705dbe683SOmar Sandoval */ 125805dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 125905dbe683SOmar Sandoval key.objectid = dirid; 126005dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 126105dbe683SOmar Sandoval key.offset = (u64)-1; 126205dbe683SOmar Sandoval 12630ff40a91SMarcos Paulo de Souza ret = btrfs_search_backwards(fs_root, &key, path); 126405dbe683SOmar Sandoval if (ret < 0) { 126505dbe683SOmar Sandoval goto err; 126605dbe683SOmar Sandoval } else if (ret > 0) { 126705dbe683SOmar Sandoval ret = -ENOENT; 126805dbe683SOmar Sandoval goto err; 126905dbe683SOmar Sandoval } 127005dbe683SOmar Sandoval 127105dbe683SOmar Sandoval dirid = key.offset; 127205dbe683SOmar Sandoval 127305dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 127405dbe683SOmar Sandoval path->slots[0], 127505dbe683SOmar Sandoval struct btrfs_inode_ref); 127605dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 127705dbe683SOmar Sandoval inode_ref); 127805dbe683SOmar Sandoval ptr -= len + 1; 127905dbe683SOmar Sandoval if (ptr < name) { 128005dbe683SOmar Sandoval ret = -ENAMETOOLONG; 128105dbe683SOmar Sandoval goto err; 128205dbe683SOmar Sandoval } 128305dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 128405dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 128505dbe683SOmar Sandoval ptr[0] = '/'; 128605dbe683SOmar Sandoval btrfs_release_path(path); 128705dbe683SOmar Sandoval } 128800246528SJosef Bacik btrfs_put_root(fs_root); 12895168489aSJosef Bacik fs_root = NULL; 129005dbe683SOmar Sandoval } 129105dbe683SOmar Sandoval 129205dbe683SOmar Sandoval btrfs_free_path(path); 129305dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 129405dbe683SOmar Sandoval name[0] = '/'; 129505dbe683SOmar Sandoval name[1] = '\0'; 129605dbe683SOmar Sandoval } else { 129705dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 129805dbe683SOmar Sandoval } 129905dbe683SOmar Sandoval return name; 130005dbe683SOmar Sandoval 130105dbe683SOmar Sandoval err: 130200246528SJosef Bacik btrfs_put_root(fs_root); 130305dbe683SOmar Sandoval btrfs_free_path(path); 130405dbe683SOmar Sandoval kfree(name); 130505dbe683SOmar Sandoval return ERR_PTR(ret); 130605dbe683SOmar Sandoval } 130705dbe683SOmar Sandoval 130805dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 130905dbe683SOmar Sandoval { 131005dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 131173f73415SJosef Bacik struct btrfs_dir_item *di; 131273f73415SJosef Bacik struct btrfs_path *path; 131373f73415SJosef Bacik struct btrfs_key location; 131473f73415SJosef Bacik u64 dir_id; 131573f73415SJosef Bacik 131673f73415SJosef Bacik path = btrfs_alloc_path(); 131773f73415SJosef Bacik if (!path) 131805dbe683SOmar Sandoval return -ENOMEM; 131973f73415SJosef Bacik 132073f73415SJosef Bacik /* 132173f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 132273f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 132373f73415SJosef Bacik * to mount. 132473f73415SJosef Bacik */ 1325815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 132673f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1327b0839166SJulia Lawall if (IS_ERR(di)) { 1328b0839166SJulia Lawall btrfs_free_path(path); 132905dbe683SOmar Sandoval return PTR_ERR(di); 1330b0839166SJulia Lawall } 133173f73415SJosef Bacik if (!di) { 133273f73415SJosef Bacik /* 133373f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 133473f73415SJosef Bacik * it's always been there, but don't freak out, just try and 133505dbe683SOmar Sandoval * mount the top-level subvolume. 133673f73415SJosef Bacik */ 133773f73415SJosef Bacik btrfs_free_path(path); 133805dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 133905dbe683SOmar Sandoval return 0; 134073f73415SJosef Bacik } 134173f73415SJosef Bacik 134273f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 134373f73415SJosef Bacik btrfs_free_path(path); 134405dbe683SOmar Sandoval *objectid = location.objectid; 134505dbe683SOmar Sandoval return 0; 134673f73415SJosef Bacik } 134773f73415SJosef Bacik 13488a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 13498a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 135056e033a7SDavid Sterba void *data) 13512e635a27SChris Mason { 13522e635a27SChris Mason struct inode *inode; 1353815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 135439279cc3SChris Mason int err; 13552e635a27SChris Mason 13562e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 13572e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1358e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1359af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1360be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 136114605409SBoris Burkov #ifdef CONFIG_FS_VERITY 136214605409SBoris Burkov sb->s_vop = &btrfs_verityops; 136314605409SBoris Burkov #endif 13645103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 13652e635a27SChris Mason sb->s_time_gran = 1; 13660eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 13671751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 136849cf6f45SChris Ball #endif 1369357fdad0SMatthew Garrett sb->s_flags |= SB_I_VERSION; 1370da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 13719e11ceeeSJan Kara 13729e11ceeeSJan Kara err = super_setup_bdi(sb); 13739e11ceeeSJan Kara if (err) { 13749e11ceeeSJan Kara btrfs_err(fs_info, "super_setup_bdi failed"); 13759e11ceeeSJan Kara return err; 13769e11ceeeSJan Kara } 13779e11ceeeSJan Kara 1378ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1379ad2b2c80SAl Viro if (err) { 1380ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "open_ctree failed"); 1381ad2b2c80SAl Viro return err; 1382e20d96d6SChris Mason } 1383b888db2bSChris Mason 13840202e83fSDavid Sterba inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root); 13855d4f98a2SYan Zheng if (IS_ERR(inode)) { 13865d4f98a2SYan Zheng err = PTR_ERR(inode); 138739279cc3SChris Mason goto fail_close; 138839279cc3SChris Mason } 13892e635a27SChris Mason 139048fde701SAl Viro sb->s_root = d_make_root(inode); 139148fde701SAl Viro if (!sb->s_root) { 139239279cc3SChris Mason err = -ENOMEM; 139339279cc3SChris Mason goto fail_close; 13942e635a27SChris Mason } 139558176a96SJosef Bacik 13961751e8a6SLinus Torvalds sb->s_flags |= SB_ACTIVE; 13972e635a27SChris Mason return 0; 13982e635a27SChris Mason 139939279cc3SChris Mason fail_close: 14006bccf3abSJeff Mahoney close_ctree(fs_info); 1401d5719762SChris Mason return err; 1402d5719762SChris Mason } 1403d5719762SChris Mason 14046bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1405d5719762SChris Mason { 1406d5719762SChris Mason struct btrfs_trans_handle *trans; 1407815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1408815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1409df2ce34cSChris Mason 1410bc074524SJeff Mahoney trace_btrfs_sync_fs(fs_info, wait); 14111abe9b8aSliubo 1412d561c025SChris Mason if (!wait) { 1413815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1414df2ce34cSChris Mason return 0; 1415d561c025SChris Mason } 1416771ed689SChris Mason 14176374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 1418771ed689SChris Mason 1419d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 142060376ce4SJosef Bacik if (IS_ERR(trans)) { 1421354aa0fbSMiao Xie /* no transaction, don't bother */ 14226b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 14236b5fe46dSDavid Sterba /* 14246b5fe46dSDavid Sterba * Exit unless we have some pending changes 14256b5fe46dSDavid Sterba * that need to go through commit 14266b5fe46dSDavid Sterba */ 14276b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1428bd7de2c9SJosef Bacik return 0; 1429a53f4f8eSQu Wenruo /* 1430a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1431a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1432a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1433a53f4f8eSQu Wenruo * next commit after thawing. 1434a53f4f8eSQu Wenruo */ 1435a7e3c5f2SRakesh Pandit if (sb_start_write_trylock(sb)) 1436a7e3c5f2SRakesh Pandit sb_end_write(sb); 1437a53f4f8eSQu Wenruo else 1438a53f4f8eSQu Wenruo return 0; 14396b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 144060376ce4SJosef Bacik } 144198bd5c54SDavid Sterba if (IS_ERR(trans)) 144298bd5c54SDavid Sterba return PTR_ERR(trans); 14436b5fe46dSDavid Sterba } 14443a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 1445d5719762SChris Mason } 1446d5719762SChris Mason 1447ab0b4a3eSJosef Bacik static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed) 1448ab0b4a3eSJosef Bacik { 1449ab0b4a3eSJosef Bacik seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s); 1450ab0b4a3eSJosef Bacik *printed = true; 1451ab0b4a3eSJosef Bacik } 1452ab0b4a3eSJosef Bacik 145334c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1454a9572a15SEric Paris { 1455815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 14560f628c63SDavid Sterba const char *compress_type; 14573ef3959bSJosef Bacik const char *subvol_name; 1458ab0b4a3eSJosef Bacik bool printed = false; 1459a9572a15SEric Paris 14603cdde224SJeff Mahoney if (btrfs_test_opt(info, DEGRADED)) 1461a9572a15SEric Paris seq_puts(seq, ",degraded"); 14623cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) 1463a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 14643cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 1465a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 14663cdde224SJeff Mahoney if (btrfs_test_opt(info, NOBARRIER)) 1467a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 146895ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1469c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1470a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1471a9572a15SEric Paris num_online_cpus() + 2, 8)) 1472f7b885beSAnand Jain seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); 14733cdde224SJeff Mahoney if (btrfs_test_opt(info, COMPRESS)) { 14740f628c63SDavid Sterba compress_type = btrfs_compress_type2str(info->compress_type); 14753cdde224SJeff Mahoney if (btrfs_test_opt(info, FORCE_COMPRESS)) 1476200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1477200da64eSTsutomu Itoh else 1478200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1479f51d2b59SDavid Sterba if (info->compress_level) 1480fa4d885aSAdam Borowski seq_printf(seq, ":%d", info->compress_level); 1481200da64eSTsutomu Itoh } 14823cdde224SJeff Mahoney if (btrfs_test_opt(info, NOSSD)) 1483c289811cSChris Mason seq_puts(seq, ",nossd"); 14843cdde224SJeff Mahoney if (btrfs_test_opt(info, SSD_SPREAD)) 1485451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 14863cdde224SJeff Mahoney else if (btrfs_test_opt(info, SSD)) 1487a9572a15SEric Paris seq_puts(seq, ",ssd"); 14883cdde224SJeff Mahoney if (btrfs_test_opt(info, NOTREELOG)) 14896b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 14903cdde224SJeff Mahoney if (btrfs_test_opt(info, NOLOGREPLAY)) 1491ab0b4a3eSJosef Bacik print_rescue_option(seq, "nologreplay", &printed); 149268319c18SJosef Bacik if (btrfs_test_opt(info, USEBACKUPROOT)) 149368319c18SJosef Bacik print_rescue_option(seq, "usebackuproot", &printed); 149442437a63SJosef Bacik if (btrfs_test_opt(info, IGNOREBADROOTS)) 149542437a63SJosef Bacik print_rescue_option(seq, "ignorebadroots", &printed); 1496882dbe0cSJosef Bacik if (btrfs_test_opt(info, IGNOREDATACSUMS)) 1497882dbe0cSJosef Bacik print_rescue_option(seq, "ignoredatacsums", &printed); 14983cdde224SJeff Mahoney if (btrfs_test_opt(info, FLUSHONCOMMIT)) 14996b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 150046b27f50SDennis Zhou if (btrfs_test_opt(info, DISCARD_SYNC)) 150120a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 1502b0643e59SDennis Zhou if (btrfs_test_opt(info, DISCARD_ASYNC)) 1503b0643e59SDennis Zhou seq_puts(seq, ",discard=async"); 15041751e8a6SLinus Torvalds if (!(info->sb->s_flags & SB_POSIXACL)) 1505a9572a15SEric Paris seq_puts(seq, ",noacl"); 150604c41559SBoris Burkov if (btrfs_free_space_cache_v1_active(info)) 1507200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 150804c41559SBoris Burkov else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) 150970f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 151073bc1876SJosef Bacik else 15118965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 15123cdde224SJeff Mahoney if (btrfs_test_opt(info, RESCAN_UUID_TREE)) 1513f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 15143cdde224SJeff Mahoney if (btrfs_test_opt(info, CLEAR_CACHE)) 1515200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 15163cdde224SJeff Mahoney if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) 1517200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 15183cdde224SJeff Mahoney if (btrfs_test_opt(info, ENOSPC_DEBUG)) 15190942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 15203cdde224SJeff Mahoney if (btrfs_test_opt(info, AUTO_DEFRAG)) 15210942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 15223cdde224SJeff Mahoney if (btrfs_test_opt(info, SKIP_BALANCE)) 15239555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 15248507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 1525cbeaae4fSDavid Sterba if (btrfs_test_opt(info, CHECK_INTEGRITY_DATA)) 15268507d216SWang Shilong seq_puts(seq, ",check_int_data"); 15273cdde224SJeff Mahoney else if (btrfs_test_opt(info, CHECK_INTEGRITY)) 15288507d216SWang Shilong seq_puts(seq, ",check_int"); 15298507d216SWang Shilong if (info->check_integrity_print_mask) 15308507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 15318507d216SWang Shilong info->check_integrity_print_mask); 15328507d216SWang Shilong #endif 15338507d216SWang Shilong if (info->metadata_ratio) 1534764cb8b4SAnand Jain seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); 15353cdde224SJeff Mahoney if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) 15368c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 15378b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 1538d3740608SAnand Jain seq_printf(seq, ",commit=%u", info->commit_interval); 1539d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 15403cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_DATA)) 1541d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 15423cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_METADATA)) 1543d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1544d0bd4560SJosef Bacik #endif 1545fb592373SJosef Bacik if (btrfs_test_opt(info, REF_VERIFY)) 1546fb592373SJosef Bacik seq_puts(seq, ",ref_verify"); 1547c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1548c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 15493ef3959bSJosef Bacik subvol_name = btrfs_get_subvol_name_from_objectid(info, 15503ef3959bSJosef Bacik BTRFS_I(d_inode(dentry))->root->root_key.objectid); 15513ef3959bSJosef Bacik if (!IS_ERR(subvol_name)) { 1552c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 15533ef3959bSJosef Bacik seq_escape(seq, subvol_name, " \t\n\\"); 15543ef3959bSJosef Bacik kfree(subvol_name); 15553ef3959bSJosef Bacik } 1556a9572a15SEric Paris return 0; 1557a9572a15SEric Paris } 1558a9572a15SEric Paris 1559a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 15602e635a27SChris Mason { 1561815745cfSAl Viro struct btrfs_fs_info *p = data; 1562815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 15634b82d6e4SYan 1564815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 15654b82d6e4SYan } 15664b82d6e4SYan 1567450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1568450ba0eaSJosef Bacik { 15696de1d09dSAl Viro int err = set_anon_super(s, data); 15706de1d09dSAl Viro if (!err) 1571450ba0eaSJosef Bacik s->s_fs_info = data; 15726de1d09dSAl Viro return err; 1573450ba0eaSJosef Bacik } 1574450ba0eaSJosef Bacik 1575830c4adbSJosef Bacik /* 1576f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1577f9d9ef62SDavid Sterba */ 1578f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1579f9d9ef62SDavid Sterba { 1580f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1581f9d9ef62SDavid Sterba return 1; 1582f9d9ef62SDavid Sterba return 0; 1583f9d9ef62SDavid Sterba } 1584f9d9ef62SDavid Sterba 1585bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1586ae0bc863SAnand Jain struct vfsmount *mnt) 1587830c4adbSJosef Bacik { 1588830c4adbSJosef Bacik struct dentry *root; 1589fa330659SOmar Sandoval int ret; 1590830c4adbSJosef Bacik 159105dbe683SOmar Sandoval if (!subvol_name) { 159205dbe683SOmar Sandoval if (!subvol_objectid) { 159305dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 159405dbe683SOmar Sandoval &subvol_objectid); 159505dbe683SOmar Sandoval if (ret) { 159605dbe683SOmar Sandoval root = ERR_PTR(ret); 159705dbe683SOmar Sandoval goto out; 159805dbe683SOmar Sandoval } 159905dbe683SOmar Sandoval } 1600c0c907a4SMarcos Paulo de Souza subvol_name = btrfs_get_subvol_name_from_objectid( 1601c0c907a4SMarcos Paulo de Souza btrfs_sb(mnt->mnt_sb), subvol_objectid); 160205dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 160305dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 160405dbe683SOmar Sandoval subvol_name = NULL; 160505dbe683SOmar Sandoval goto out; 160605dbe683SOmar Sandoval } 160705dbe683SOmar Sandoval 160805dbe683SOmar Sandoval } 160905dbe683SOmar Sandoval 1610ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1611fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1612fa330659SOmar Sandoval mnt = NULL; 1613830c4adbSJosef Bacik 1614bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1615ea441d11SAl Viro struct super_block *s = root->d_sb; 1616ab8d0fc4SJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(s); 1617bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1618bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1619bb289b7bSOmar Sandoval 1620bb289b7bSOmar Sandoval ret = 0; 1621bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1622ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "'%s' is not a valid subvolume", 1623bb289b7bSOmar Sandoval subvol_name); 1624bb289b7bSOmar Sandoval ret = -EINVAL; 1625bb289b7bSOmar Sandoval } 1626bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 162705dbe683SOmar Sandoval /* 162805dbe683SOmar Sandoval * This will also catch a race condition where a 162905dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 163005dbe683SOmar Sandoval * another subvolume is renamed over the old location. 163105dbe683SOmar Sandoval */ 1632ab8d0fc4SJeff Mahoney btrfs_err(fs_info, 1633ab8d0fc4SJeff Mahoney "subvol '%s' does not match subvolid %llu", 1634bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1635bb289b7bSOmar Sandoval ret = -EINVAL; 1636bb289b7bSOmar Sandoval } 1637bb289b7bSOmar Sandoval if (ret) { 1638ea441d11SAl Viro dput(root); 1639bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1640ea441d11SAl Viro deactivate_locked_super(s); 1641bb289b7bSOmar Sandoval } 1642f9d9ef62SDavid Sterba } 1643f9d9ef62SDavid Sterba 1644fa330659SOmar Sandoval out: 1645fa330659SOmar Sandoval mntput(mnt); 1646fa330659SOmar Sandoval kfree(subvol_name); 1647830c4adbSJosef Bacik return root; 1648830c4adbSJosef Bacik } 1649450ba0eaSJosef Bacik 1650312c89fbSMisono, Tomohiro /* 1651312c89fbSMisono, Tomohiro * Find a superblock for the given device / mount point. 1652312c89fbSMisono, Tomohiro * 1653312c89fbSMisono, Tomohiro * Note: This is based on mount_bdev from fs/super.c with a few additions 1654312c89fbSMisono, Tomohiro * for multiple device setup. Make sure to keep it in sync. 1655312c89fbSMisono, Tomohiro */ 165672fa39f5SMisono, Tomohiro static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 165772fa39f5SMisono, Tomohiro int flags, const char *device_name, void *data) 165872fa39f5SMisono, Tomohiro { 165972fa39f5SMisono, Tomohiro struct block_device *bdev = NULL; 166072fa39f5SMisono, Tomohiro struct super_block *s; 166136350e95SGu Jinxiang struct btrfs_device *device = NULL; 166272fa39f5SMisono, Tomohiro struct btrfs_fs_devices *fs_devices = NULL; 166372fa39f5SMisono, Tomohiro struct btrfs_fs_info *fs_info = NULL; 1664204cc0ccSAl Viro void *new_sec_opts = NULL; 166572fa39f5SMisono, Tomohiro fmode_t mode = FMODE_READ; 166672fa39f5SMisono, Tomohiro int error = 0; 166772fa39f5SMisono, Tomohiro 166872fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY)) 166972fa39f5SMisono, Tomohiro mode |= FMODE_WRITE; 167072fa39f5SMisono, Tomohiro 167172fa39f5SMisono, Tomohiro if (data) { 1672a65001e8SAl Viro error = security_sb_eat_lsm_opts(data, &new_sec_opts); 167372fa39f5SMisono, Tomohiro if (error) 167472fa39f5SMisono, Tomohiro return ERR_PTR(error); 167572fa39f5SMisono, Tomohiro } 167672fa39f5SMisono, Tomohiro 167772fa39f5SMisono, Tomohiro /* 167872fa39f5SMisono, Tomohiro * Setup a dummy root and fs_info for test/set super. This is because 167972fa39f5SMisono, Tomohiro * we don't actually fill this stuff out until open_ctree, but we need 16808260edbaSJosef Bacik * then open_ctree will properly initialize the file system specific 16818260edbaSJosef Bacik * settings later. btrfs_init_fs_info initializes the static elements 16828260edbaSJosef Bacik * of the fs_info (locks and such) to make cleanup easier if we find a 16838260edbaSJosef Bacik * superblock with our given fs_devices later on at sget() time. 168472fa39f5SMisono, Tomohiro */ 1685a8fd1f71SJeff Mahoney fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 168672fa39f5SMisono, Tomohiro if (!fs_info) { 168772fa39f5SMisono, Tomohiro error = -ENOMEM; 168872fa39f5SMisono, Tomohiro goto error_sec_opts; 168972fa39f5SMisono, Tomohiro } 16908260edbaSJosef Bacik btrfs_init_fs_info(fs_info); 169172fa39f5SMisono, Tomohiro 169272fa39f5SMisono, Tomohiro fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 169372fa39f5SMisono, Tomohiro fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 169472fa39f5SMisono, Tomohiro if (!fs_info->super_copy || !fs_info->super_for_commit) { 169572fa39f5SMisono, Tomohiro error = -ENOMEM; 169672fa39f5SMisono, Tomohiro goto error_fs_info; 169772fa39f5SMisono, Tomohiro } 169872fa39f5SMisono, Tomohiro 1699f5194e34SDavid Sterba mutex_lock(&uuid_mutex); 1700fa59f27cSAnand Jain error = btrfs_parse_device_options(data, mode, fs_type); 170181ffd56bSDavid Sterba if (error) { 1702399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 1703399f7f4cSDavid Sterba goto error_fs_info; 170481ffd56bSDavid Sterba } 1705399f7f4cSDavid Sterba 170636350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, mode, fs_type); 170736350e95SGu Jinxiang if (IS_ERR(device)) { 1708399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 170936350e95SGu Jinxiang error = PTR_ERR(device); 1710399f7f4cSDavid Sterba goto error_fs_info; 171181ffd56bSDavid Sterba } 1712399f7f4cSDavid Sterba 171336350e95SGu Jinxiang fs_devices = device->fs_devices; 1714399f7f4cSDavid Sterba fs_info->fs_devices = fs_devices; 1715399f7f4cSDavid Sterba 171672fa39f5SMisono, Tomohiro error = btrfs_open_devices(fs_devices, mode, fs_type); 1717f5194e34SDavid Sterba mutex_unlock(&uuid_mutex); 171872fa39f5SMisono, Tomohiro if (error) 171972fa39f5SMisono, Tomohiro goto error_fs_info; 172072fa39f5SMisono, Tomohiro 172172fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 172272fa39f5SMisono, Tomohiro error = -EACCES; 172372fa39f5SMisono, Tomohiro goto error_close_devices; 172472fa39f5SMisono, Tomohiro } 172572fa39f5SMisono, Tomohiro 1726d24fa5c1SAnand Jain bdev = fs_devices->latest_dev->bdev; 172772fa39f5SMisono, Tomohiro s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 172872fa39f5SMisono, Tomohiro fs_info); 172972fa39f5SMisono, Tomohiro if (IS_ERR(s)) { 173072fa39f5SMisono, Tomohiro error = PTR_ERR(s); 173172fa39f5SMisono, Tomohiro goto error_close_devices; 173272fa39f5SMisono, Tomohiro } 173372fa39f5SMisono, Tomohiro 173472fa39f5SMisono, Tomohiro if (s->s_root) { 173572fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 17360d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 173772fa39f5SMisono, Tomohiro if ((flags ^ s->s_flags) & SB_RDONLY) 173872fa39f5SMisono, Tomohiro error = -EBUSY; 173972fa39f5SMisono, Tomohiro } else { 174072fa39f5SMisono, Tomohiro snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 174172fa39f5SMisono, Tomohiro btrfs_sb(s)->bdev_holder = fs_type; 17429b4e675aSDavid Sterba if (!strstr(crc32c_impl(), "generic")) 17439b4e675aSDavid Sterba set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); 174472fa39f5SMisono, Tomohiro error = btrfs_fill_super(s, fs_devices, data); 174572fa39f5SMisono, Tomohiro } 1746a65001e8SAl Viro if (!error) 1747204cc0ccSAl Viro error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL); 1748a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 174972fa39f5SMisono, Tomohiro if (error) { 175072fa39f5SMisono, Tomohiro deactivate_locked_super(s); 1751a65001e8SAl Viro return ERR_PTR(error); 175272fa39f5SMisono, Tomohiro } 175372fa39f5SMisono, Tomohiro 175472fa39f5SMisono, Tomohiro return dget(s->s_root); 175572fa39f5SMisono, Tomohiro 175672fa39f5SMisono, Tomohiro error_close_devices: 175772fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 175872fa39f5SMisono, Tomohiro error_fs_info: 17590d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 176072fa39f5SMisono, Tomohiro error_sec_opts: 176172fa39f5SMisono, Tomohiro security_free_mnt_opts(&new_sec_opts); 176272fa39f5SMisono, Tomohiro return ERR_PTR(error); 176372fa39f5SMisono, Tomohiro } 1764312c89fbSMisono, Tomohiro 1765edf24abeSChristoph Hellwig /* 1766312c89fbSMisono, Tomohiro * Mount function which is called by VFS layer. 1767edf24abeSChristoph Hellwig * 1768312c89fbSMisono, Tomohiro * In order to allow mounting a subvolume directly, btrfs uses mount_subtree() 1769312c89fbSMisono, Tomohiro * which needs vfsmount* of device's root (/). This means device's root has to 1770312c89fbSMisono, Tomohiro * be mounted internally in any case. 1771312c89fbSMisono, Tomohiro * 1772312c89fbSMisono, Tomohiro * Operation flow: 1773312c89fbSMisono, Tomohiro * 1. Parse subvol id related options for later use in mount_subvol(). 1774312c89fbSMisono, Tomohiro * 1775312c89fbSMisono, Tomohiro * 2. Mount device's root (/) by calling vfs_kern_mount(). 1776312c89fbSMisono, Tomohiro * 1777312c89fbSMisono, Tomohiro * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the 1778312c89fbSMisono, Tomohiro * first place. In order to avoid calling btrfs_mount() again, we use 1779312c89fbSMisono, Tomohiro * different file_system_type which is not registered to VFS by 1780312c89fbSMisono, Tomohiro * register_filesystem() (btrfs_root_fs_type). As a result, 1781312c89fbSMisono, Tomohiro * btrfs_mount_root() is called. The return value will be used by 1782312c89fbSMisono, Tomohiro * mount_subtree() in mount_subvol(). 1783312c89fbSMisono, Tomohiro * 1784312c89fbSMisono, Tomohiro * 3. Call mount_subvol() to get the dentry of subvolume. Since there is 1785312c89fbSMisono, Tomohiro * "btrfs subvolume set-default", mount_subvol() is called always. 1786edf24abeSChristoph Hellwig */ 1787061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1788306e16ceSDavid Sterba const char *device_name, void *data) 17894b82d6e4SYan { 1790312c89fbSMisono, Tomohiro struct vfsmount *mnt_root; 1791312c89fbSMisono, Tomohiro struct dentry *root; 179273f73415SJosef Bacik char *subvol_name = NULL; 179373f73415SJosef Bacik u64 subvol_objectid = 0; 17944b82d6e4SYan int error = 0; 17954b82d6e4SYan 179693b9bcdfSGu Jinxiang error = btrfs_parse_subvol_options(data, &subvol_name, 179793b9bcdfSGu Jinxiang &subvol_objectid); 1798f23c8af8SIlya Dryomov if (error) { 1799f23c8af8SIlya Dryomov kfree(subvol_name); 1800061dbc6bSAl Viro return ERR_PTR(error); 1801f23c8af8SIlya Dryomov } 1802edf24abeSChristoph Hellwig 1803312c89fbSMisono, Tomohiro /* mount device's root (/) */ 1804312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); 1805312c89fbSMisono, Tomohiro if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { 1806312c89fbSMisono, Tomohiro if (flags & SB_RDONLY) { 1807312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1808312c89fbSMisono, Tomohiro flags & ~SB_RDONLY, device_name, data); 18094b82d6e4SYan } else { 1810312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1811312c89fbSMisono, Tomohiro flags | SB_RDONLY, device_name, data); 1812312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1813312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1814532b618bSEric W. Biederman kfree(subvol_name); 1815312c89fbSMisono, Tomohiro goto out; 1816f667aef6SQu Wenruo } 1817f667aef6SQu Wenruo 1818312c89fbSMisono, Tomohiro down_write(&mnt_root->mnt_sb->s_umount); 1819312c89fbSMisono, Tomohiro error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); 1820312c89fbSMisono, Tomohiro up_write(&mnt_root->mnt_sb->s_umount); 1821312c89fbSMisono, Tomohiro if (error < 0) { 1822312c89fbSMisono, Tomohiro root = ERR_PTR(error); 1823312c89fbSMisono, Tomohiro mntput(mnt_root); 1824532b618bSEric W. Biederman kfree(subvol_name); 1825312c89fbSMisono, Tomohiro goto out; 1826312c89fbSMisono, Tomohiro } 1827312c89fbSMisono, Tomohiro } 1828312c89fbSMisono, Tomohiro } 1829312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1830312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1831532b618bSEric W. Biederman kfree(subvol_name); 1832312c89fbSMisono, Tomohiro goto out; 1833f667aef6SQu Wenruo } 18344b82d6e4SYan 1835312c89fbSMisono, Tomohiro /* mount_subvol() will free subvol_name and mnt_root */ 1836ae0bc863SAnand Jain root = mount_subvol(subvol_name, subvol_objectid, mnt_root); 18374b82d6e4SYan 1838312c89fbSMisono, Tomohiro out: 1839312c89fbSMisono, Tomohiro return root; 18404b82d6e4SYan } 18412e635a27SChris Mason 18420d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 1843f7b885beSAnand Jain u32 new_pool_size, u32 old_pool_size) 18440d2450abSSergei Trofimovich { 18450d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 18460d2450abSSergei Trofimovich return; 18470d2450abSSergei Trofimovich 18480d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 18490d2450abSSergei Trofimovich 1850efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 18510d2450abSSergei Trofimovich old_pool_size, new_pool_size); 18520d2450abSSergei Trofimovich 18535cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1854afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1855e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1856fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1857fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1858fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1859fccb5d86SQu Wenruo new_pool_size); 1860fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1861fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 18625b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 18630339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1864ff023aacSStefan Behrens new_pool_size); 18650d2450abSSergei Trofimovich } 18660d2450abSSergei Trofimovich 1867f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1868f42a34b2SMiao Xie unsigned long old_opts, int flags) 1869f42a34b2SMiao Xie { 1870dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1871dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 18721751e8a6SLinus Torvalds (flags & SB_RDONLY))) { 1873dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1874dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1875dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 18761751e8a6SLinus Torvalds if (flags & SB_RDONLY) 1877dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1878dc81cdc5SMiao Xie } 1879dc81cdc5SMiao Xie } 1880dc81cdc5SMiao Xie 1881dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1882dc81cdc5SMiao Xie unsigned long old_opts) 1883dc81cdc5SMiao Xie { 188494846229SBoris Burkov const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE); 188594846229SBoris Burkov 1886dc81cdc5SMiao Xie /* 1887180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1888180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1889dc81cdc5SMiao Xie */ 1890dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1891bc98a42cSDavid Howells (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { 1892dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1893dc81cdc5SMiao Xie } 1894dc81cdc5SMiao Xie 1895b0643e59SDennis Zhou /* If we toggled discard async */ 1896b0643e59SDennis Zhou if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && 1897b0643e59SDennis Zhou btrfs_test_opt(fs_info, DISCARD_ASYNC)) 1898b0643e59SDennis Zhou btrfs_discard_resume(fs_info); 1899b0643e59SDennis Zhou else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && 1900b0643e59SDennis Zhou !btrfs_test_opt(fs_info, DISCARD_ASYNC)) 1901b0643e59SDennis Zhou btrfs_discard_cleanup(fs_info); 190294846229SBoris Burkov 190394846229SBoris Burkov /* If we toggled space cache */ 190494846229SBoris Burkov if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) 190594846229SBoris Burkov btrfs_set_free_space_cache_v1_active(fs_info, cache_opt); 1906dc81cdc5SMiao Xie } 1907dc81cdc5SMiao Xie 1908c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1909c146afadSYan Zheng { 1910815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 191149b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 191249b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 191349b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 191449b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 1915f7b885beSAnand Jain u32 old_thread_pool_size = fs_info->thread_pool_size; 1916d612ac59SAnand Jain u32 old_metadata_ratio = fs_info->metadata_ratio; 1917c146afadSYan Zheng int ret; 1918c146afadSYan Zheng 191902b9984dSTheodore Ts'o sync_filesystem(sb); 192088c4703fSJohannes Thumshirn set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1921dc81cdc5SMiao Xie 1922f667aef6SQu Wenruo if (data) { 1923204cc0ccSAl Viro void *new_sec_opts = NULL; 1924f667aef6SQu Wenruo 1925a65001e8SAl Viro ret = security_sb_eat_lsm_opts(data, &new_sec_opts); 1926a65001e8SAl Viro if (!ret) 1927204cc0ccSAl Viro ret = security_sb_remount(sb, new_sec_opts); 1928a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 1929f667aef6SQu Wenruo if (ret) 1930f667aef6SQu Wenruo goto restore; 1931f667aef6SQu Wenruo } 1932f667aef6SQu Wenruo 19332ff7e61eSJeff Mahoney ret = btrfs_parse_options(fs_info, data, *flags); 1934891f41cbSChengguang Xu if (ret) 193549b25e05SJeff Mahoney goto restore; 1936b288052eSChris Mason 1937f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 19380d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 19390d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 19400d2450abSSergei Trofimovich 1941c55a4319SBoris Burkov if ((bool)btrfs_test_opt(fs_info, FREE_SPACE_TREE) != 1942c55a4319SBoris Burkov (bool)btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && 19432838d255SBoris Burkov (!sb_rdonly(sb) || (*flags & SB_RDONLY))) { 19442838d255SBoris Burkov btrfs_warn(fs_info, 19452838d255SBoris Burkov "remount supports changing free space tree only from ro to rw"); 19462838d255SBoris Burkov /* Make sure free space cache options match the state on disk */ 19472838d255SBoris Burkov if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { 19482838d255SBoris Burkov btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE); 19492838d255SBoris Burkov btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE); 19502838d255SBoris Burkov } 19512838d255SBoris Burkov if (btrfs_free_space_cache_v1_active(fs_info)) { 19522838d255SBoris Burkov btrfs_clear_opt(fs_info->mount_opt, FREE_SPACE_TREE); 19532838d255SBoris Burkov btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE); 19542838d255SBoris Burkov } 19552838d255SBoris Burkov } 19562838d255SBoris Burkov 19571751e8a6SLinus Torvalds if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1958dc81cdc5SMiao Xie goto out; 1959c146afadSYan Zheng 19601751e8a6SLinus Torvalds if (*flags & SB_RDONLY) { 19618dabb742SStefan Behrens /* 19628dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 19638dabb742SStefan Behrens * the filesystem is busy. 19648dabb742SStefan Behrens */ 196521c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 196657056740SJosef Bacik cancel_work_sync(&fs_info->async_data_reclaim_work); 1967361c093dSStefan Behrens 1968b0643e59SDennis Zhou btrfs_discard_cleanup(fs_info); 1969b0643e59SDennis Zhou 1970361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1971361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1972361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1973361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1974361c093dSStefan Behrens 1975a0a1db70SFilipe Manana btrfs_set_sb_rdonly(sb); 1976c146afadSYan Zheng 1977e44163e1SJeff Mahoney /* 19781751e8a6SLinus Torvalds * Setting SB_RDONLY will put the cleaner thread to 1979e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1980e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1981e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1982e44163e1SJeff Mahoney * unless we clean them up here. 1983e44163e1SJeff Mahoney */ 1984e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1985e44163e1SJeff Mahoney 1986a0a1db70SFilipe Manana /* 1987a0a1db70SFilipe Manana * The cleaner task could be already running before we set the 1988a0a1db70SFilipe Manana * flag BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock). 1989a0a1db70SFilipe Manana * We must make sure that after we finish the remount, i.e. after 1990a0a1db70SFilipe Manana * we call btrfs_commit_super(), the cleaner can no longer start 1991a0a1db70SFilipe Manana * a transaction - either because it was dropping a dead root, 1992a0a1db70SFilipe Manana * running delayed iputs or deleting an unused block group (the 1993a0a1db70SFilipe Manana * cleaner picked a block group from the list of unused block 1994a0a1db70SFilipe Manana * groups before we were able to in the previous call to 1995a0a1db70SFilipe Manana * btrfs_delete_unused_bgs()). 1996a0a1db70SFilipe Manana */ 1997a0a1db70SFilipe Manana wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING, 1998a0a1db70SFilipe Manana TASK_UNINTERRUPTIBLE); 1999a0a1db70SFilipe Manana 2000a8cc263eSFilipe Manana /* 2001a8cc263eSFilipe Manana * We've set the superblock to RO mode, so we might have made 2002a8cc263eSFilipe Manana * the cleaner task sleep without running all pending delayed 2003a8cc263eSFilipe Manana * iputs. Go through all the delayed iputs here, so that if an 2004a8cc263eSFilipe Manana * unmount happens without remounting RW we don't end up at 2005a8cc263eSFilipe Manana * finishing close_ctree() with a non-empty list of delayed 2006a8cc263eSFilipe Manana * iputs. 2007a8cc263eSFilipe Manana */ 2008a8cc263eSFilipe Manana btrfs_run_delayed_iputs(fs_info); 2009a8cc263eSFilipe Manana 20108dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 20118dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 2012061594efSMiao Xie btrfs_pause_balance(fs_info); 20138dabb742SStefan Behrens 2014cb13eea3SFilipe Manana /* 2015cb13eea3SFilipe Manana * Pause the qgroup rescan worker if it is running. We don't want 2016cb13eea3SFilipe Manana * it to be still running after we are in RO mode, as after that, 2017cb13eea3SFilipe Manana * by the time we unmount, it might have left a transaction open, 2018cb13eea3SFilipe Manana * so we would leak the transaction and/or crash. 2019cb13eea3SFilipe Manana */ 2020cb13eea3SFilipe Manana btrfs_qgroup_wait_for_completion(fs_info, false); 2021cb13eea3SFilipe Manana 20226bccf3abSJeff Mahoney ret = btrfs_commit_super(fs_info); 202349b25e05SJeff Mahoney if (ret) 202449b25e05SJeff Mahoney goto restore; 2025c146afadSYan Zheng } else { 202684961539SJosef Bacik if (BTRFS_FS_ERROR(fs_info)) { 20276ef3de9cSDavid Sterba btrfs_err(fs_info, 2028efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 20296ef3de9cSDavid Sterba ret = -EINVAL; 20306ef3de9cSDavid Sterba goto restore; 20316ef3de9cSDavid Sterba } 20328a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 203349b25e05SJeff Mahoney ret = -EACCES; 203449b25e05SJeff Mahoney goto restore; 20358a3db184SSergei Trofimovich } 20362b82032cSYan Zheng 20376528b99dSAnand Jain if (!btrfs_check_rw_degradable(fs_info, NULL)) { 2038efe120a0SFrank Holton btrfs_warn(fs_info, 203952042d8eSAndrea Gelmini "too many missing devices, writable remount is not allowed"); 2040292fd7fcSStefan Behrens ret = -EACCES; 2041292fd7fcSStefan Behrens goto restore; 2042292fd7fcSStefan Behrens } 2043292fd7fcSStefan Behrens 20448a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 204510a3a3edSDavid Sterba btrfs_warn(fs_info, 204610a3a3edSDavid Sterba "mount required to replay tree-log, cannot remount read-write"); 204749b25e05SJeff Mahoney ret = -EINVAL; 204849b25e05SJeff Mahoney goto restore; 20498a3db184SSergei Trofimovich } 2050c146afadSYan Zheng 205144c0ca21SBoris Burkov /* 205244c0ca21SBoris Burkov * NOTE: when remounting with a change that does writes, don't 205344c0ca21SBoris Burkov * put it anywhere above this point, as we are not sure to be 205444c0ca21SBoris Burkov * safe to write until we pass the above checks. 205544c0ca21SBoris Burkov */ 205644c0ca21SBoris Burkov ret = btrfs_start_pre_rw_mount(fs_info); 205749b25e05SJeff Mahoney if (ret) 205849b25e05SJeff Mahoney goto restore; 2059c146afadSYan Zheng 2060a0a1db70SFilipe Manana btrfs_clear_sb_rdonly(sb); 206190c711abSZygo Blaxell 2062afcdd129SJosef Bacik set_bit(BTRFS_FS_OPEN, &fs_info->flags); 2063c146afadSYan Zheng } 2064dc81cdc5SMiao Xie out: 2065faa00889SJosef Bacik /* 2066faa00889SJosef Bacik * We need to set SB_I_VERSION here otherwise it'll get cleared by VFS, 2067faa00889SJosef Bacik * since the absence of the flag means it can be toggled off by remount. 2068faa00889SJosef Bacik */ 2069faa00889SJosef Bacik *flags |= SB_I_VERSION; 2070faa00889SJosef Bacik 20712c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 2072dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 20738cd29088SBoris Burkov btrfs_clear_oneshot_options(fs_info); 207488c4703fSJohannes Thumshirn clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 207588c4703fSJohannes Thumshirn 2076c146afadSYan Zheng return 0; 207749b25e05SJeff Mahoney 207849b25e05SJeff Mahoney restore: 20791751e8a6SLinus Torvalds /* We've hit an error - don't reset SB_RDONLY */ 2080bc98a42cSDavid Howells if (sb_rdonly(sb)) 20811751e8a6SLinus Torvalds old_flags |= SB_RDONLY; 2082a0a1db70SFilipe Manana if (!(old_flags & SB_RDONLY)) 2083a0a1db70SFilipe Manana clear_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state); 208449b25e05SJeff Mahoney sb->s_flags = old_flags; 208549b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 208649b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 208749b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 20880d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 20890d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 209049b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 2091dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 209288c4703fSJohannes Thumshirn clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 209388c4703fSJohannes Thumshirn 209449b25e05SJeff Mahoney return ret; 2095c146afadSYan Zheng } 2096c146afadSYan Zheng 2097bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 2098214cc184SDavid Sterba static int btrfs_cmp_device_free_bytes(const void *a, const void *b) 2099bcd53741SArne Jansen { 2100214cc184SDavid Sterba const struct btrfs_device_info *dev_info1 = a; 2101214cc184SDavid Sterba const struct btrfs_device_info *dev_info2 = b; 2102214cc184SDavid Sterba 2103214cc184SDavid Sterba if (dev_info1->max_avail > dev_info2->max_avail) 2104bcd53741SArne Jansen return -1; 2105214cc184SDavid Sterba else if (dev_info1->max_avail < dev_info2->max_avail) 2106bcd53741SArne Jansen return 1; 2107bcd53741SArne Jansen return 0; 2108bcd53741SArne Jansen } 2109bcd53741SArne Jansen 2110bcd53741SArne Jansen /* 2111bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 2112bcd53741SArne Jansen * is stored.(Descending Sort) 2113bcd53741SArne Jansen */ 2114bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 2115bcd53741SArne Jansen struct btrfs_device_info *devices, 2116bcd53741SArne Jansen size_t nr_devices) 2117bcd53741SArne Jansen { 2118bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 2119bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 2120bcd53741SArne Jansen } 2121bcd53741SArne Jansen 21226d07bcecSMiao Xie /* 21236d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 21246d07bcecSMiao Xie * file data. 21256d07bcecSMiao Xie */ 21267e17916bSArnd Bergmann static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, 21276bccf3abSJeff Mahoney u64 *free_bytes) 21286d07bcecSMiao Xie { 21296d07bcecSMiao Xie struct btrfs_device_info *devices_info; 21306d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 21316d07bcecSMiao Xie struct btrfs_device *device; 21326d07bcecSMiao Xie u64 type; 21336d07bcecSMiao Xie u64 avail_space; 21346d07bcecSMiao Xie u64 min_stripe_size; 2135559ca6eaSNikolay Borisov int num_stripes = 1; 21366d07bcecSMiao Xie int i = 0, nr_devices; 21374f080f57SDavid Sterba const struct btrfs_raid_attr *rattr; 21386d07bcecSMiao Xie 21397e33fd99SJosef Bacik /* 214001327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 21417e33fd99SJosef Bacik * enough for our purposes. 21427e33fd99SJosef Bacik */ 2143b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 21447e33fd99SJosef Bacik if (!nr_devices) { 21457e33fd99SJosef Bacik smp_mb(); 21467e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 21477e33fd99SJosef Bacik ASSERT(nr_devices); 21487e33fd99SJosef Bacik if (!nr_devices) { 21497e33fd99SJosef Bacik *free_bytes = 0; 21507e33fd99SJosef Bacik return 0; 21517e33fd99SJosef Bacik } 21527e33fd99SJosef Bacik } 21536d07bcecSMiao Xie 2154d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 21556a44517dSDavid Sterba GFP_KERNEL); 21566d07bcecSMiao Xie if (!devices_info) 21576d07bcecSMiao Xie return -ENOMEM; 21586d07bcecSMiao Xie 215901327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 21601b86826dSJeff Mahoney type = btrfs_data_alloc_profile(fs_info); 21614f080f57SDavid Sterba rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)]; 21624f080f57SDavid Sterba 2163e1ea2beeSDavid Sterba if (type & BTRFS_BLOCK_GROUP_RAID0) 216439fb26c3SMiao Xie num_stripes = nr_devices; 2165e1ea2beeSDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1) 216639fb26c3SMiao Xie num_stripes = 2; 216747e6f742SDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1C3) 216847e6f742SDavid Sterba num_stripes = 3; 21698d6fac00SDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID1C4) 21708d6fac00SDavid Sterba num_stripes = 4; 2171e1ea2beeSDavid Sterba else if (type & BTRFS_BLOCK_GROUP_RAID10) 217239fb26c3SMiao Xie num_stripes = 4; 21736d07bcecSMiao Xie 21744f080f57SDavid Sterba /* Adjust for more than 1 stripe per device */ 21754f080f57SDavid Sterba min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN; 21766d07bcecSMiao Xie 21777e33fd99SJosef Bacik rcu_read_lock(); 21787e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 2179e12c9621SAnand Jain if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 2180e12c9621SAnand Jain &device->dev_state) || 2181401e29c1SAnand Jain !device->bdev || 2182401e29c1SAnand Jain test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) 21836d07bcecSMiao Xie continue; 21846d07bcecSMiao Xie 21857e33fd99SJosef Bacik if (i >= nr_devices) 21867e33fd99SJosef Bacik break; 21877e33fd99SJosef Bacik 21886d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 21896d07bcecSMiao Xie 21906d07bcecSMiao Xie /* align with stripe_len */ 2191559ca6eaSNikolay Borisov avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN); 21926d07bcecSMiao Xie 21936d07bcecSMiao Xie /* 219401327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 21956d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 21966d07bcecSMiao Xie * allocation. 2197559ca6eaSNikolay Borisov * 2198559ca6eaSNikolay Borisov * This ensures we have at least min_stripe_size free space 2199559ca6eaSNikolay Borisov * after excluding 1MB. 22006d07bcecSMiao Xie */ 2201559ca6eaSNikolay Borisov if (avail_space <= SZ_1M + min_stripe_size) 22026d07bcecSMiao Xie continue; 22036d07bcecSMiao Xie 2204559ca6eaSNikolay Borisov avail_space -= SZ_1M; 2205559ca6eaSNikolay Borisov 22066d07bcecSMiao Xie devices_info[i].dev = device; 22076d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 22086d07bcecSMiao Xie 22096d07bcecSMiao Xie i++; 22106d07bcecSMiao Xie } 22117e33fd99SJosef Bacik rcu_read_unlock(); 22126d07bcecSMiao Xie 22136d07bcecSMiao Xie nr_devices = i; 22146d07bcecSMiao Xie 22156d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 22166d07bcecSMiao Xie 22176d07bcecSMiao Xie i = nr_devices - 1; 22186d07bcecSMiao Xie avail_space = 0; 2219559ca6eaSNikolay Borisov while (nr_devices >= rattr->devs_min) { 2220559ca6eaSNikolay Borisov num_stripes = min(num_stripes, nr_devices); 222139fb26c3SMiao Xie 22226d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 22236d07bcecSMiao Xie int j; 22246d07bcecSMiao Xie u64 alloc_size; 22256d07bcecSMiao Xie 222639fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 22276d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 222839fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 22296d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 22306d07bcecSMiao Xie } 22316d07bcecSMiao Xie i--; 22326d07bcecSMiao Xie nr_devices--; 22336d07bcecSMiao Xie } 22346d07bcecSMiao Xie 22356d07bcecSMiao Xie kfree(devices_info); 22366d07bcecSMiao Xie *free_bytes = avail_space; 22376d07bcecSMiao Xie return 0; 22386d07bcecSMiao Xie } 22396d07bcecSMiao Xie 2240ba7b6e62SDavid Sterba /* 2241ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2242ba7b6e62SDavid Sterba * 2243ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2244ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2245ba7b6e62SDavid Sterba * 2246ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 22470d0c71b3SDavid Sterba * algorithm that respects the device sizes and order of allocations. This is 22480d0c71b3SDavid Sterba * a close approximation of the actual use but there are other factors that may 22490d0c71b3SDavid Sterba * change the result (like a new metadata chunk). 2250ba7b6e62SDavid Sterba * 2251ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2252ba7b6e62SDavid Sterba */ 22538fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 22548fd17795SChris Mason { 2255815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2256815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2257bd4d1088SJosef Bacik struct btrfs_space_info *found; 2258bd4d1088SJosef Bacik u64 total_used = 0; 22596d07bcecSMiao Xie u64 total_free_data = 0; 2260ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2261265fdfa6SDavid Sterba u32 bits = fs_info->sectorsize_bits; 2262de37aa51SNikolay Borisov __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid; 2263ba7b6e62SDavid Sterba unsigned factor = 1; 2264ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 22656d07bcecSMiao Xie int ret; 2266ca8a51b3SDavid Sterba u64 thresh = 0; 2267ae02d1bdSLuis de Bethencourt int mixed = 0; 22688fd17795SChris Mason 226972804905SJosef Bacik list_for_each_entry(found, &fs_info->space_info, list) { 22706d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2271ba7b6e62SDavid Sterba int i; 2272ba7b6e62SDavid Sterba 22736d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 22746d07bcecSMiao Xie total_free_data -= 22756d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2276ba7b6e62SDavid Sterba 2277ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 227846df06b8SDavid Sterba if (!list_empty(&found->block_groups[i])) 227946df06b8SDavid Sterba factor = btrfs_bg_type_to_factor( 228046df06b8SDavid Sterba btrfs_raid_array[i].bg_flag); 2281ba7b6e62SDavid Sterba } 22826d07bcecSMiao Xie } 2283ae02d1bdSLuis de Bethencourt 2284ae02d1bdSLuis de Bethencourt /* 2285ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2286ae02d1bdSLuis de Bethencourt */ 2287ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2288ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2289ae02d1bdSLuis de Bethencourt mixed = 1; 2290ae02d1bdSLuis de Bethencourt else 2291ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2292ae02d1bdSLuis de Bethencourt found->disk_used; 2293ae02d1bdSLuis de Bethencourt } 22946d07bcecSMiao Xie 2295b742bb82SYan, Zheng total_used += found->disk_used; 229689a55897SJosef Bacik } 2297ba7b6e62SDavid Sterba 2298ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2299ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2300ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2301ba7b6e62SDavid Sterba 2302ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2303ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 230441b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 230541b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2306ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 230741b34accSLuis de Bethencourt else 230841b34accSLuis de Bethencourt buf->f_bfree = 0; 2309ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2310ba7b6e62SDavid Sterba 23110d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 23126bccf3abSJeff Mahoney ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); 23137e33fd99SJosef Bacik if (ret) 23146d07bcecSMiao Xie return ret; 2315ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 23166d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2317d397712bSChris Mason 2318ca8a51b3SDavid Sterba /* 2319ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2320ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2321ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2322ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2323ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2324ca8a51b3SDavid Sterba * 2325ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2326ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2327ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2328ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2329ca8a51b3SDavid Sterba * way around. 2330ca8a51b3SDavid Sterba */ 2331d4417e22SNikolay Borisov thresh = SZ_4M; 2332ca8a51b3SDavid Sterba 2333d55966c4SJosef Bacik /* 2334d55966c4SJosef Bacik * We only want to claim there's no available space if we can no longer 2335d55966c4SJosef Bacik * allocate chunks for our metadata profile and our global reserve will 2336d55966c4SJosef Bacik * not fit in the free metadata space. If we aren't ->full then we 2337d55966c4SJosef Bacik * still can allocate chunks and thus are fine using the currently 2338d55966c4SJosef Bacik * calculated f_bavail. 2339d55966c4SJosef Bacik */ 2340d55966c4SJosef Bacik if (!mixed && block_rsv->space_info->full && 2341d55966c4SJosef Bacik total_free_meta - thresh < block_rsv->size) 2342ca8a51b3SDavid Sterba buf->f_bavail = 0; 2343ca8a51b3SDavid Sterba 2344ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2345ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2346ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2347ba7b6e62SDavid Sterba 23489d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 23499d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 23509d03632eSDavid Woodhouse on a big-endian or little-endian host */ 23519d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 23529d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 235332d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 23544fd786e6SMisono Tomohiro buf->f_fsid.val[0] ^= 23554fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32; 23564fd786e6SMisono Tomohiro buf->f_fsid.val[1] ^= 23574fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid; 235832d48fa1SDavid Woodhouse 23598fd17795SChris Mason return 0; 23608fd17795SChris Mason } 2361b5133862SChris Mason 2362aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2363aea52e19SAl Viro { 2364815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2365aea52e19SAl Viro kill_anon_super(sb); 23660d4b0463SJosef Bacik btrfs_free_fs_info(fs_info); 2367aea52e19SAl Viro } 2368aea52e19SAl Viro 23692e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 23702e635a27SChris Mason .owner = THIS_MODULE, 23712e635a27SChris Mason .name = "btrfs", 2372061dbc6bSAl Viro .mount = btrfs_mount, 2373aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2374f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 23752e635a27SChris Mason }; 237672fa39f5SMisono, Tomohiro 237772fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type = { 237872fa39f5SMisono, Tomohiro .owner = THIS_MODULE, 237972fa39f5SMisono, Tomohiro .name = "btrfs", 238072fa39f5SMisono, Tomohiro .mount = btrfs_mount_root, 238172fa39f5SMisono, Tomohiro .kill_sb = btrfs_kill_super, 23825b9b26f5SChristian Brauner .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP, 238372fa39f5SMisono, Tomohiro }; 238472fa39f5SMisono, Tomohiro 23857f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2386a9218f6bSChris Mason 2387d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2388d8620958STom Van Braeckel { 2389d8620958STom Van Braeckel /* 2390d8620958STom Van Braeckel * The control file's private_data is used to hold the 2391d8620958STom Van Braeckel * transaction when it is started and is used to keep 2392d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2393d8620958STom Van Braeckel */ 2394d8620958STom Van Braeckel file->private_data = NULL; 2395d8620958STom Van Braeckel return 0; 2396d8620958STom Van Braeckel } 2397d8620958STom Van Braeckel 2398d352ac68SChris Mason /* 2399cfe953c8SSu Yue * Used by /dev/btrfs-control for devices ioctls. 2400d352ac68SChris Mason */ 24018a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 24028a4b83ccSChris Mason unsigned long arg) 24038a4b83ccSChris Mason { 24048a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 240536350e95SGu Jinxiang struct btrfs_device *device = NULL; 240616cab91aSAnand Jain dev_t devt = 0; 2407c071fcfdSChris Mason int ret = -ENOTTY; 24088a4b83ccSChris Mason 2409e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2410e441d54dSChris Mason return -EPERM; 2411e441d54dSChris Mason 2412dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2413dae7b665SLi Zefan if (IS_ERR(vol)) 2414dae7b665SLi Zefan return PTR_ERR(vol); 2415f505754fSFilipe Manana vol->name[BTRFS_PATH_NAME_MAX] = '\0'; 2416c071fcfdSChris Mason 24178a4b83ccSChris Mason switch (cmd) { 24188a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 2419899f9307SDavid Sterba mutex_lock(&uuid_mutex); 242036350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 242136350e95SGu Jinxiang &btrfs_root_fs_type); 242236350e95SGu Jinxiang ret = PTR_ERR_OR_ZERO(device); 2423899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 24248a4b83ccSChris Mason break; 2425228a73abSAnand Jain case BTRFS_IOC_FORGET_DEV: 242616cab91aSAnand Jain if (vol->name[0] != 0) { 242716cab91aSAnand Jain ret = lookup_bdev(vol->name, &devt); 242816cab91aSAnand Jain if (ret) 242916cab91aSAnand Jain break; 243016cab91aSAnand Jain } 243116cab91aSAnand Jain ret = btrfs_forget_devices(devt); 2432228a73abSAnand Jain break; 243302db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 2434899f9307SDavid Sterba mutex_lock(&uuid_mutex); 243536350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 243636350e95SGu Jinxiang &btrfs_root_fs_type); 243736350e95SGu Jinxiang if (IS_ERR(device)) { 2438899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 243936350e95SGu Jinxiang ret = PTR_ERR(device); 244002db0844SJosef Bacik break; 2441899f9307SDavid Sterba } 244236350e95SGu Jinxiang ret = !(device->fs_devices->num_devices == 244336350e95SGu Jinxiang device->fs_devices->total_devices); 2444899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 244502db0844SJosef Bacik break; 2446c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2447d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2448c5868f83SDavid Sterba break; 24498a4b83ccSChris Mason } 2450dae7b665SLi Zefan 24518a4b83ccSChris Mason kfree(vol); 2452f819d837SLinda Knippers return ret; 24538a4b83ccSChris Mason } 24548a4b83ccSChris Mason 24550176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2456ed0dab6bSYan { 2457354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 24580b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 24590b246afaSJeff Mahoney struct btrfs_root *root = fs_info->tree_root; 2460354aa0fbSMiao Xie 2461fac03c8dSDavid Sterba set_bit(BTRFS_FS_FROZEN, &fs_info->flags); 24629e7cc91aSWang Xiaoguang /* 24639e7cc91aSWang Xiaoguang * We don't need a barrier here, we'll wait for any transaction that 24649e7cc91aSWang Xiaoguang * could be in progress on other threads (and do delayed iputs that 24659e7cc91aSWang Xiaoguang * we want to avoid on a frozen filesystem), or do the commit 24669e7cc91aSWang Xiaoguang * ourselves. 24679e7cc91aSWang Xiaoguang */ 2468d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2469354aa0fbSMiao Xie if (IS_ERR(trans)) { 2470354aa0fbSMiao Xie /* no transaction, don't bother */ 2471354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 24720176260fSLinus Torvalds return 0; 2473354aa0fbSMiao Xie return PTR_ERR(trans); 2474354aa0fbSMiao Xie } 24753a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 2476ed0dab6bSYan } 2477ed0dab6bSYan 24789e7cc91aSWang Xiaoguang static int btrfs_unfreeze(struct super_block *sb) 24799e7cc91aSWang Xiaoguang { 2480fac03c8dSDavid Sterba struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2481fac03c8dSDavid Sterba 2482fac03c8dSDavid Sterba clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); 24839e7cc91aSWang Xiaoguang return 0; 24849e7cc91aSWang Xiaoguang } 24859e7cc91aSWang Xiaoguang 24869c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 24879c5085c1SJosef Bacik { 24889c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 24899c5085c1SJosef Bacik 249088c14590SDavid Sterba /* 24916605fd2fSAnand Jain * There should be always a valid pointer in latest_dev, it may be stale 24926605fd2fSAnand Jain * for a short moment in case it's being deleted but still valid until 24936605fd2fSAnand Jain * the end of RCU grace period. 249488c14590SDavid Sterba */ 249588c14590SDavid Sterba rcu_read_lock(); 24966605fd2fSAnand Jain seq_escape(m, rcu_str_deref(fs_info->fs_devices->latest_dev->name), " \t\n\\"); 249788c14590SDavid Sterba rcu_read_unlock(); 24986605fd2fSAnand Jain 24999c5085c1SJosef Bacik return 0; 25009c5085c1SJosef Bacik } 25019c5085c1SJosef Bacik 2502b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 250376dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2504bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2505e20d96d6SChris Mason .put_super = btrfs_put_super, 2506d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2507a9572a15SEric Paris .show_options = btrfs_show_options, 25089c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 25092c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 25102c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 251126602cabSAl Viro .free_inode = btrfs_free_inode, 25128fd17795SChris Mason .statfs = btrfs_statfs, 2513c146afadSYan Zheng .remount_fs = btrfs_remount, 25140176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 25159e7cc91aSWang Xiaoguang .unfreeze_fs = btrfs_unfreeze, 2516e20d96d6SChris Mason }; 2517a9218f6bSChris Mason 2518a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2519d8620958STom Van Braeckel .open = btrfs_control_open, 2520a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 25211832f2d8SArnd Bergmann .compat_ioctl = compat_ptr_ioctl, 2522a9218f6bSChris Mason .owner = THIS_MODULE, 25236038f373SArnd Bergmann .llseek = noop_llseek, 2524a9218f6bSChris Mason }; 2525a9218f6bSChris Mason 2526a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2527578454ffSKay Sievers .minor = BTRFS_MINOR, 2528a9218f6bSChris Mason .name = "btrfs-control", 2529a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2530a9218f6bSChris Mason }; 2531a9218f6bSChris Mason 2532578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2533578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2534578454ffSKay Sievers 2535f5c29bd9SLiu Bo static int __init btrfs_interface_init(void) 2536a9218f6bSChris Mason { 2537a9218f6bSChris Mason return misc_register(&btrfs_misc); 2538a9218f6bSChris Mason } 2539a9218f6bSChris Mason 2540e67c718bSDavid Sterba static __cold void btrfs_interface_exit(void) 2541a9218f6bSChris Mason { 2542f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2543a9218f6bSChris Mason } 2544a9218f6bSChris Mason 2545f5c29bd9SLiu Bo static void __init btrfs_print_mod_info(void) 254685965600SDavid Sterba { 2547edf57cbfSBart Van Assche static const char options[] = "" 254885965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 254985965600SDavid Sterba ", debug=on" 255085965600SDavid Sterba #endif 255179556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 255279556c3dSStefan Behrens ", assert=on" 255379556c3dSStefan Behrens #endif 255485965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 255585965600SDavid Sterba ", integrity-checker=on" 255685965600SDavid Sterba #endif 2557fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2558fb592373SJosef Bacik ", ref-verify=on" 2559fb592373SJosef Bacik #endif 25605b316468SNaohiro Aota #ifdef CONFIG_BLK_DEV_ZONED 25615b316468SNaohiro Aota ", zoned=yes" 25625b316468SNaohiro Aota #else 25635b316468SNaohiro Aota ", zoned=no" 25645b316468SNaohiro Aota #endif 2565ea3dc7d2SDavid Sterba #ifdef CONFIG_FS_VERITY 2566ea3dc7d2SDavid Sterba ", fsverity=yes" 2567ea3dc7d2SDavid Sterba #else 2568ea3dc7d2SDavid Sterba ", fsverity=no" 2569ea3dc7d2SDavid Sterba #endif 2570edf57cbfSBart Van Assche ; 2571edf57cbfSBart Van Assche pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); 257285965600SDavid Sterba } 257385965600SDavid Sterba 25742e635a27SChris Mason static int __init init_btrfs_fs(void) 25752e635a27SChris Mason { 25762c90e5d6SChris Mason int err; 257758176a96SJosef Bacik 257863541927SFilipe David Borba Manana btrfs_props_init(); 257963541927SFilipe David Borba Manana 258058176a96SJosef Bacik err = btrfs_init_sysfs(); 258158176a96SJosef Bacik if (err) 25829678c543SNikolay Borisov return err; 258358176a96SJosef Bacik 2584143bede5SJeff Mahoney btrfs_init_compress(); 2585d1310b2eSChris Mason 2586261507a0SLi Zefan err = btrfs_init_cachep(); 2587261507a0SLi Zefan if (err) 2588261507a0SLi Zefan goto free_compress; 2589261507a0SLi Zefan 2590d1310b2eSChris Mason err = extent_io_init(); 25912f4cbe64SWyatt Banks if (err) 25922f4cbe64SWyatt Banks goto free_cachep; 25932f4cbe64SWyatt Banks 25946f0d04f8SJosef Bacik err = extent_state_cache_init(); 2595d1310b2eSChris Mason if (err) 2596d1310b2eSChris Mason goto free_extent_io; 2597d1310b2eSChris Mason 25986f0d04f8SJosef Bacik err = extent_map_init(); 25996f0d04f8SJosef Bacik if (err) 26006f0d04f8SJosef Bacik goto free_extent_state_cache; 26016f0d04f8SJosef Bacik 26026352b91dSMiao Xie err = ordered_data_init(); 26032f4cbe64SWyatt Banks if (err) 26042f4cbe64SWyatt Banks goto free_extent_map; 2605c8b97818SChris Mason 26066352b91dSMiao Xie err = btrfs_delayed_inode_init(); 26076352b91dSMiao Xie if (err) 26086352b91dSMiao Xie goto free_ordered_data; 26096352b91dSMiao Xie 26109247f317SMiao Xie err = btrfs_auto_defrag_init(); 261116cdcec7SMiao Xie if (err) 261216cdcec7SMiao Xie goto free_delayed_inode; 261316cdcec7SMiao Xie 261478a6184aSMiao Xie err = btrfs_delayed_ref_init(); 26159247f317SMiao Xie if (err) 26169247f317SMiao Xie goto free_auto_defrag; 26179247f317SMiao Xie 2618b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2619b9e9a6cbSWang Shilong if (err) 2620af13b492SDavid Sterba goto free_delayed_ref; 2621b9e9a6cbSWang Shilong 262297eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 262378a6184aSMiao Xie if (err) 2624af13b492SDavid Sterba goto free_prelim_ref; 262578a6184aSMiao Xie 262697eb6b69SDavid Sterba err = btrfs_interface_init(); 262797eb6b69SDavid Sterba if (err) 262897eb6b69SDavid Sterba goto free_end_io_wq; 262997eb6b69SDavid Sterba 26308ae1af3cSAnand Jain btrfs_print_mod_info(); 2631dc11dd5dSJosef Bacik 2632dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2633dc11dd5dSJosef Bacik if (err) 2634dc11dd5dSJosef Bacik goto unregister_ioctl; 2635dc11dd5dSJosef Bacik 2636dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2637dc11dd5dSJosef Bacik if (err) 2638dc11dd5dSJosef Bacik goto unregister_ioctl; 263974255aa0SJosef Bacik 26402f4cbe64SWyatt Banks return 0; 26412f4cbe64SWyatt Banks 2642a9218f6bSChris Mason unregister_ioctl: 2643a9218f6bSChris Mason btrfs_interface_exit(); 264497eb6b69SDavid Sterba free_end_io_wq: 264597eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2646b9e9a6cbSWang Shilong free_prelim_ref: 2647b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 264878a6184aSMiao Xie free_delayed_ref: 264978a6184aSMiao Xie btrfs_delayed_ref_exit(); 26509247f317SMiao Xie free_auto_defrag: 26519247f317SMiao Xie btrfs_auto_defrag_exit(); 265216cdcec7SMiao Xie free_delayed_inode: 265316cdcec7SMiao Xie btrfs_delayed_inode_exit(); 26546352b91dSMiao Xie free_ordered_data: 26556352b91dSMiao Xie ordered_data_exit(); 26562f4cbe64SWyatt Banks free_extent_map: 26572f4cbe64SWyatt Banks extent_map_exit(); 26586f0d04f8SJosef Bacik free_extent_state_cache: 26596f0d04f8SJosef Bacik extent_state_cache_exit(); 2660d1310b2eSChris Mason free_extent_io: 2661d1310b2eSChris Mason extent_io_exit(); 26622f4cbe64SWyatt Banks free_cachep: 26632f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2664261507a0SLi Zefan free_compress: 2665261507a0SLi Zefan btrfs_exit_compress(); 26662f4cbe64SWyatt Banks btrfs_exit_sysfs(); 26679678c543SNikolay Borisov 26682c90e5d6SChris Mason return err; 26692e635a27SChris Mason } 26702e635a27SChris Mason 26712e635a27SChris Mason static void __exit exit_btrfs_fs(void) 26722e635a27SChris Mason { 267339279cc3SChris Mason btrfs_destroy_cachep(); 267478a6184aSMiao Xie btrfs_delayed_ref_exit(); 26759247f317SMiao Xie btrfs_auto_defrag_exit(); 267616cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2677b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 26786352b91dSMiao Xie ordered_data_exit(); 2679a52d9a80SChris Mason extent_map_exit(); 26806f0d04f8SJosef Bacik extent_state_cache_exit(); 2681d1310b2eSChris Mason extent_io_exit(); 2682a9218f6bSChris Mason btrfs_interface_exit(); 26835ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 26842e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 268558176a96SJosef Bacik btrfs_exit_sysfs(); 26868a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2687261507a0SLi Zefan btrfs_exit_compress(); 26882e635a27SChris Mason } 26892e635a27SChris Mason 269060efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 26912e635a27SChris Mason module_exit(exit_btrfs_fs) 26922e635a27SChris Mason 26932e635a27SChris Mason MODULE_LICENSE("GPL"); 2694d5178578SJohannes Thumshirn MODULE_SOFTDEP("pre: crc32c"); 26953951e7f0SJohannes Thumshirn MODULE_SOFTDEP("pre: xxhash64"); 26963831bf00SJohannes Thumshirn MODULE_SOFTDEP("pre: sha256"); 2697352ae07bSDavid Sterba MODULE_SOFTDEP("pre: blake2b-256"); 2698