1c1d7c514SDavid Sterba // SPDX-License-Identifier: GPL-2.0 26cbd5570SChris Mason /* 36cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 46cbd5570SChris Mason */ 56cbd5570SChris Mason 64b82d6e4SYan #include <linux/blkdev.h> 72e635a27SChris Mason #include <linux/module.h> 82e635a27SChris Mason #include <linux/fs.h> 92e635a27SChris Mason #include <linux/pagemap.h> 102e635a27SChris Mason #include <linux/highmem.h> 112e635a27SChris Mason #include <linux/time.h> 122e635a27SChris Mason #include <linux/init.h> 13a9572a15SEric Paris #include <linux/seq_file.h> 142e635a27SChris Mason #include <linux/string.h> 152e635a27SChris Mason #include <linux/backing-dev.h> 164b82d6e4SYan #include <linux/mount.h> 1775dfe396SChris Mason #include <linux/writeback.h> 188fd17795SChris Mason #include <linux/statfs.h> 1908607c1bSChris Mason #include <linux/compat.h> 2095e05289SChris Mason #include <linux/parser.h> 21c59f8951SChris Mason #include <linux/ctype.h> 226da6abaeSChris Mason #include <linux/namei.h> 23a9218f6bSChris Mason #include <linux/miscdevice.h> 241bcbf313SQinghuang Feng #include <linux/magic.h> 255a0e3ad6STejun Heo #include <linux/slab.h> 2690a887c9SDan Magenheimer #include <linux/cleancache.h> 2722c44fe6SJosef Bacik #include <linux/ratelimit.h> 289678c543SNikolay Borisov #include <linux/crc32c.h> 2955e301fdSFilipe Brandenburger #include <linux/btrfs.h> 3016cdcec7SMiao Xie #include "delayed-inode.h" 312e635a27SChris Mason #include "ctree.h" 32e20d96d6SChris Mason #include "disk-io.h" 33d5719762SChris Mason #include "transaction.h" 342c90e5d6SChris Mason #include "btrfs_inode.h" 353a686375SChris Mason #include "print-tree.h" 3663541927SFilipe David Borba Manana #include "props.h" 375103e947SJosef Bacik #include "xattr.h" 388a4b83ccSChris Mason #include "volumes.h" 39be6e8dc0SBalaji Rao #include "export.h" 40c8b97818SChris Mason #include "compression.h" 419c5085c1SJosef Bacik #include "rcu-string.h" 428dabb742SStefan Behrens #include "dev-replace.h" 4374255aa0SJosef Bacik #include "free-space-cache.h" 44b9e9a6cbSWang Shilong #include "backref.h" 45dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 462e635a27SChris Mason 47d3982100SMark Fasheh #include "qgroup.h" 481abe9b8aSliubo #define CREATE_TRACE_POINTS 491abe9b8aSliubo #include <trace/events/btrfs.h> 501abe9b8aSliubo 51b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 5272fa39f5SMisono, Tomohiro 5372fa39f5SMisono, Tomohiro /* 5472fa39f5SMisono, Tomohiro * Types for mounting the default subvolume and a subvolume explicitly 5572fa39f5SMisono, Tomohiro * requested by subvol=/path. That way the callchain is straightforward and we 5672fa39f5SMisono, Tomohiro * don't have to play tricks with the mount options and recursive calls to 5772fa39f5SMisono, Tomohiro * btrfs_mount. 58312c89fbSMisono, Tomohiro * 59312c89fbSMisono, Tomohiro * The new btrfs_root_fs_type also servers as a tag for the bdev_holder. 6072fa39f5SMisono, Tomohiro */ 61830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 6272fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type; 63e20d96d6SChris Mason 640723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 650723a047SHarald Hoyer 66e33e17eeSJeff Mahoney const char *btrfs_decode_error(int errno) 67acce952bSliubo { 6808748810SDavid Sterba char *errstr = "unknown"; 69acce952bSliubo 70acce952bSliubo switch (errno) { 71acce952bSliubo case -EIO: 72acce952bSliubo errstr = "IO failure"; 73acce952bSliubo break; 74acce952bSliubo case -ENOMEM: 75acce952bSliubo errstr = "Out of memory"; 76acce952bSliubo break; 77acce952bSliubo case -EROFS: 78acce952bSliubo errstr = "Readonly filesystem"; 79acce952bSliubo break; 808c342930SJeff Mahoney case -EEXIST: 818c342930SJeff Mahoney errstr = "Object already exists"; 828c342930SJeff Mahoney break; 8394ef7280SDavid Sterba case -ENOSPC: 8494ef7280SDavid Sterba errstr = "No space left"; 8594ef7280SDavid Sterba break; 8694ef7280SDavid Sterba case -ENOENT: 8794ef7280SDavid Sterba errstr = "No such entry"; 8894ef7280SDavid Sterba break; 89acce952bSliubo } 90acce952bSliubo 91acce952bSliubo return errstr; 92acce952bSliubo } 93acce952bSliubo 94acce952bSliubo /* 9534d97007SAnand Jain * __btrfs_handle_fs_error decodes expected errors from the caller and 96acce952bSliubo * invokes the approciate error response. 97acce952bSliubo */ 98c0d19e2bSDavid Sterba __cold 9934d97007SAnand Jain void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 1004da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 101acce952bSliubo { 102acce952bSliubo struct super_block *sb = fs_info->sb; 10357d816a1SAnand Jain #ifdef CONFIG_PRINTK 104acce952bSliubo const char *errstr; 10557d816a1SAnand Jain #endif 106acce952bSliubo 107acce952bSliubo /* 108acce952bSliubo * Special case: if the error is EROFS, and we're already 1091751e8a6SLinus Torvalds * under SB_RDONLY, then it is safe here. 110acce952bSliubo */ 111bc98a42cSDavid Howells if (errno == -EROFS && sb_rdonly(sb)) 112acce952bSliubo return; 113acce952bSliubo 11457d816a1SAnand Jain #ifdef CONFIG_PRINTK 11508748810SDavid Sterba errstr = btrfs_decode_error(errno); 1164da35113SJeff Mahoney if (fmt) { 11737252a66SEric Sandeen struct va_format vaf; 11837252a66SEric Sandeen va_list args; 11937252a66SEric Sandeen 12037252a66SEric Sandeen va_start(args, fmt); 12137252a66SEric Sandeen vaf.fmt = fmt; 12237252a66SEric Sandeen vaf.va = &args; 1234da35113SJeff Mahoney 12462e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 12508748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 12637252a66SEric Sandeen va_end(args); 1274da35113SJeff Mahoney } else { 12862e85577SJeff Mahoney pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 12908748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1304da35113SJeff Mahoney } 13157d816a1SAnand Jain #endif 132acce952bSliubo 1330713d90cSAnand Jain /* 1340713d90cSAnand Jain * Today we only save the error info to memory. Long term we'll 1350713d90cSAnand Jain * also send it down to the disk 1360713d90cSAnand Jain */ 1370713d90cSAnand Jain set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 1380713d90cSAnand Jain 1394da35113SJeff Mahoney /* Don't go through full error handling during mount */ 140922ea899SAnand Jain if (!(sb->s_flags & SB_BORN)) 141922ea899SAnand Jain return; 142922ea899SAnand Jain 143922ea899SAnand Jain if (sb_rdonly(sb)) 144922ea899SAnand Jain return; 145922ea899SAnand Jain 146922ea899SAnand Jain /* btrfs handle error by forcing the filesystem readonly */ 147922ea899SAnand Jain sb->s_flags |= SB_RDONLY; 148922ea899SAnand Jain btrfs_info(fs_info, "forced readonly"); 149922ea899SAnand Jain /* 150922ea899SAnand Jain * Note that a running device replace operation is not canceled here 151922ea899SAnand Jain * although there is no way to update the progress. It would add the 152922ea899SAnand Jain * risk of a deadlock, therefore the canceling is omitted. The only 153922ea899SAnand Jain * penalty is that some I/O remains active until the procedure 154922ea899SAnand Jain * completes. The next time when the filesystem is mounted writeable 155922ea899SAnand Jain * again, the device replace operation continues. 156922ea899SAnand Jain */ 157acce952bSliubo } 1584da35113SJeff Mahoney 15957d816a1SAnand Jain #ifdef CONFIG_PRINTK 160533574c6SJoe Perches static const char * const logtypes[] = { 1614da35113SJeff Mahoney "emergency", 1624da35113SJeff Mahoney "alert", 1634da35113SJeff Mahoney "critical", 1644da35113SJeff Mahoney "error", 1654da35113SJeff Mahoney "warning", 1664da35113SJeff Mahoney "notice", 1674da35113SJeff Mahoney "info", 1684da35113SJeff Mahoney "debug", 1694da35113SJeff Mahoney }; 1704da35113SJeff Mahoney 17135f4e5e6SNikolay Borisov 17235f4e5e6SNikolay Borisov /* 17335f4e5e6SNikolay Borisov * Use one ratelimit state per log level so that a flood of less important 17435f4e5e6SNikolay Borisov * messages doesn't cause more important ones to be dropped. 17535f4e5e6SNikolay Borisov */ 17635f4e5e6SNikolay Borisov static struct ratelimit_state printk_limits[] = { 17735f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), 17835f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), 17935f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), 18035f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), 18135f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), 18235f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), 18335f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), 18435f4e5e6SNikolay Borisov RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), 18535f4e5e6SNikolay Borisov }; 18635f4e5e6SNikolay Borisov 187c2cf52ebSSimon Kirby void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 1884da35113SJeff Mahoney { 18940f7828bSPetr Mladek char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; 1904da35113SJeff Mahoney struct va_format vaf; 1914da35113SJeff Mahoney va_list args; 192533574c6SJoe Perches int kern_level; 19340f7828bSPetr Mladek const char *type = logtypes[4]; 19440f7828bSPetr Mladek struct ratelimit_state *ratelimit = &printk_limits[4]; 1954da35113SJeff Mahoney 1964da35113SJeff Mahoney va_start(args, fmt); 1974da35113SJeff Mahoney 198262c5e86SPetr Mladek while ((kern_level = printk_get_level(fmt)) != 0) { 199533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 200262c5e86SPetr Mladek 201262c5e86SPetr Mladek if (kern_level >= '0' && kern_level <= '7') { 202533574c6SJoe Perches memcpy(lvl, fmt, size); 203533574c6SJoe Perches lvl[size] = '\0'; 204533574c6SJoe Perches type = logtypes[kern_level - '0']; 20535f4e5e6SNikolay Borisov ratelimit = &printk_limits[kern_level - '0']; 206262c5e86SPetr Mladek } 207262c5e86SPetr Mladek fmt += size; 208262c5e86SPetr Mladek } 209262c5e86SPetr Mladek 2104da35113SJeff Mahoney vaf.fmt = fmt; 2114da35113SJeff Mahoney vaf.va = &args; 212533574c6SJoe Perches 21335f4e5e6SNikolay Borisov if (__ratelimit(ratelimit)) 2143993b112SColin Ian King printk("%sBTRFS %s (device %s): %pV\n", lvl, type, 2153993b112SColin Ian King fs_info ? fs_info->sb->s_id : "<unknown>", &vaf); 216533574c6SJoe Perches 217533574c6SJoe Perches va_end(args); 2184da35113SJeff Mahoney } 219533574c6SJoe Perches #endif 220533574c6SJoe Perches 2218c342930SJeff Mahoney /* 22249b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 22349b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 22449b25e05SJeff Mahoney * one. 22549b25e05SJeff Mahoney * 22649b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 22749b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 22849b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 22949b25e05SJeff Mahoney * in the call path but will return -EIO. 23049b25e05SJeff Mahoney * 23149b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 23249b25e05SJeff Mahoney * btrfs_commit_transaction. 23349b25e05SJeff Mahoney */ 234c0d19e2bSDavid Sterba __cold 23549b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 23666642832SJeff Mahoney const char *function, 23749b25e05SJeff Mahoney unsigned int line, int errno) 23849b25e05SJeff Mahoney { 23966642832SJeff Mahoney struct btrfs_fs_info *fs_info = trans->fs_info; 24066642832SJeff Mahoney 24149b25e05SJeff Mahoney trans->aborted = errno; 24249b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 24349b25e05SJeff Mahoney * transaction may be able to continue. */ 24464c12921SJeff Mahoney if (!trans->dirty && list_empty(&trans->new_bgs)) { 24569ce977aSMiao Xie const char *errstr; 24669ce977aSMiao Xie 24708748810SDavid Sterba errstr = btrfs_decode_error(errno); 24866642832SJeff Mahoney btrfs_warn(fs_info, 249c2cf52ebSSimon Kirby "%s:%d: Aborting unused transaction(%s).", 25069ce977aSMiao Xie function, line, errstr); 25149b25e05SJeff Mahoney return; 25249b25e05SJeff Mahoney } 25320c7bcecSSeraphime Kirkovski WRITE_ONCE(trans->transaction->aborted, errno); 254501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 25566642832SJeff Mahoney wake_up(&fs_info->transaction_wait); 25666642832SJeff Mahoney wake_up(&fs_info->transaction_blocked_wait); 25766642832SJeff Mahoney __btrfs_handle_fs_error(fs_info, function, line, errno, NULL); 25849b25e05SJeff Mahoney } 25949b25e05SJeff Mahoney /* 2608c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2618c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2628c342930SJeff Mahoney */ 263c0d19e2bSDavid Sterba __cold 2648c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2658c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2668c342930SJeff Mahoney { 2678c342930SJeff Mahoney char *s_id = "<unknown>"; 2688c342930SJeff Mahoney const char *errstr; 2698c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2708c342930SJeff Mahoney va_list args; 2718c342930SJeff Mahoney 2728c342930SJeff Mahoney if (fs_info) 2738c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2748c342930SJeff Mahoney 2758c342930SJeff Mahoney va_start(args, fmt); 2768c342930SJeff Mahoney vaf.va = &args; 2778c342930SJeff Mahoney 27808748810SDavid Sterba errstr = btrfs_decode_error(errno); 279d8953d69SSatoru Takeuchi if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) 28008748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 28108748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 2828c342930SJeff Mahoney 283efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 284efe120a0SFrank Holton function, line, &vaf, errno, errstr); 2858c342930SJeff Mahoney va_end(args); 2868c342930SJeff Mahoney /* Caller calls BUG() */ 2878c342930SJeff Mahoney } 288acce952bSliubo 289e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 290e20d96d6SChris Mason { 2916bccf3abSJeff Mahoney close_ctree(btrfs_sb(sb)); 292e20d96d6SChris Mason } 2932e635a27SChris Mason 29495e05289SChris Mason enum { 295416a7202SDavid Sterba Opt_acl, Opt_noacl, 296416a7202SDavid Sterba Opt_clear_cache, 297416a7202SDavid Sterba Opt_commit_interval, 298416a7202SDavid Sterba Opt_compress, 299416a7202SDavid Sterba Opt_compress_force, 300416a7202SDavid Sterba Opt_compress_force_type, 301416a7202SDavid Sterba Opt_compress_type, 302416a7202SDavid Sterba Opt_degraded, 303416a7202SDavid Sterba Opt_device, 304416a7202SDavid Sterba Opt_fatal_errors, 305416a7202SDavid Sterba Opt_flushoncommit, Opt_noflushoncommit, 306416a7202SDavid Sterba Opt_inode_cache, Opt_noinode_cache, 307416a7202SDavid Sterba Opt_max_inline, 308416a7202SDavid Sterba Opt_barrier, Opt_nobarrier, 309416a7202SDavid Sterba Opt_datacow, Opt_nodatacow, 310416a7202SDavid Sterba Opt_datasum, Opt_nodatasum, 311416a7202SDavid Sterba Opt_defrag, Opt_nodefrag, 312416a7202SDavid Sterba Opt_discard, Opt_nodiscard, 313416a7202SDavid Sterba Opt_nologreplay, 314416a7202SDavid Sterba Opt_norecovery, 315416a7202SDavid Sterba Opt_ratio, 316416a7202SDavid Sterba Opt_rescan_uuid_tree, 317416a7202SDavid Sterba Opt_skip_balance, 318416a7202SDavid Sterba Opt_space_cache, Opt_no_space_cache, 319416a7202SDavid Sterba Opt_space_cache_version, 320416a7202SDavid Sterba Opt_ssd, Opt_nossd, 321416a7202SDavid Sterba Opt_ssd_spread, Opt_nossd_spread, 322416a7202SDavid Sterba Opt_subvol, 32337becec9SOmar Sandoval Opt_subvol_empty, 324416a7202SDavid Sterba Opt_subvolid, 325416a7202SDavid Sterba Opt_thread_pool, 326416a7202SDavid Sterba Opt_treelog, Opt_notreelog, 327416a7202SDavid Sterba Opt_usebackuproot, 328416a7202SDavid Sterba Opt_user_subvol_rm_allowed, 329416a7202SDavid Sterba 330416a7202SDavid Sterba /* Deprecated options */ 331416a7202SDavid Sterba Opt_alloc_start, 332416a7202SDavid Sterba Opt_recovery, 333416a7202SDavid Sterba Opt_subvolrootid, 334416a7202SDavid Sterba 335416a7202SDavid Sterba /* Debugging options */ 336416a7202SDavid Sterba Opt_check_integrity, 33770f6d82eSOmar Sandoval Opt_check_integrity_including_extent_data, 338416a7202SDavid Sterba Opt_check_integrity_print_mask, 339416a7202SDavid Sterba Opt_enospc_debug, Opt_noenospc_debug, 340d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 341d0bd4560SJosef Bacik Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, 342d0bd4560SJosef Bacik #endif 343fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 344fb592373SJosef Bacik Opt_ref_verify, 345fb592373SJosef Bacik #endif 3469555c6c1SIlya Dryomov Opt_err, 34795e05289SChris Mason }; 34895e05289SChris Mason 3494d4ab6d6SDavid Sterba static const match_table_t tokens = { 350416a7202SDavid Sterba {Opt_acl, "acl"}, 351416a7202SDavid Sterba {Opt_noacl, "noacl"}, 352416a7202SDavid Sterba {Opt_clear_cache, "clear_cache"}, 353416a7202SDavid Sterba {Opt_commit_interval, "commit=%u"}, 354c8b97818SChris Mason {Opt_compress, "compress"}, 355261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 356a555f810SChris Mason {Opt_compress_force, "compress-force"}, 357261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 358416a7202SDavid Sterba {Opt_degraded, "degraded"}, 359416a7202SDavid Sterba {Opt_device, "device=%s"}, 360416a7202SDavid Sterba {Opt_fatal_errors, "fatal_errors=%s"}, 361dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 3622c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 3634b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3643818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 365416a7202SDavid Sterba {Opt_max_inline, "max_inline=%s"}, 366416a7202SDavid Sterba {Opt_barrier, "barrier"}, 367416a7202SDavid Sterba {Opt_nobarrier, "nobarrier"}, 368416a7202SDavid Sterba {Opt_datacow, "datacow"}, 369416a7202SDavid Sterba {Opt_nodatacow, "nodatacow"}, 370416a7202SDavid Sterba {Opt_datasum, "datasum"}, 371416a7202SDavid Sterba {Opt_nodatasum, "nodatasum"}, 372416a7202SDavid Sterba {Opt_defrag, "autodefrag"}, 373416a7202SDavid Sterba {Opt_nodefrag, "noautodefrag"}, 374416a7202SDavid Sterba {Opt_discard, "discard"}, 375416a7202SDavid Sterba {Opt_nodiscard, "nodiscard"}, 376416a7202SDavid Sterba {Opt_nologreplay, "nologreplay"}, 377416a7202SDavid Sterba {Opt_norecovery, "norecovery"}, 378416a7202SDavid Sterba {Opt_ratio, "metadata_ratio=%u"}, 379416a7202SDavid Sterba {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 3809555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 381416a7202SDavid Sterba {Opt_space_cache, "space_cache"}, 382416a7202SDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 383416a7202SDavid Sterba {Opt_space_cache_version, "space_cache=%s"}, 384416a7202SDavid Sterba {Opt_ssd, "ssd"}, 385416a7202SDavid Sterba {Opt_nossd, "nossd"}, 386416a7202SDavid Sterba {Opt_ssd_spread, "ssd_spread"}, 387416a7202SDavid Sterba {Opt_nossd_spread, "nossd_spread"}, 388416a7202SDavid Sterba {Opt_subvol, "subvol=%s"}, 38937becec9SOmar Sandoval {Opt_subvol_empty, "subvol="}, 390416a7202SDavid Sterba {Opt_subvolid, "subvolid=%s"}, 391416a7202SDavid Sterba {Opt_thread_pool, "thread_pool=%u"}, 392416a7202SDavid Sterba {Opt_treelog, "treelog"}, 393416a7202SDavid Sterba {Opt_notreelog, "notreelog"}, 394416a7202SDavid Sterba {Opt_usebackuproot, "usebackuproot"}, 395416a7202SDavid Sterba {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 396416a7202SDavid Sterba 397416a7202SDavid Sterba /* Deprecated options */ 398416a7202SDavid Sterba {Opt_alloc_start, "alloc_start=%s"}, 399416a7202SDavid Sterba {Opt_recovery, "recovery"}, 400416a7202SDavid Sterba {Opt_subvolrootid, "subvolrootid=%d"}, 401416a7202SDavid Sterba 402416a7202SDavid Sterba /* Debugging options */ 40321adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 40421adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 40502453bdeSAnand Jain {Opt_check_integrity_print_mask, "check_int_print_mask=%u"}, 406416a7202SDavid Sterba {Opt_enospc_debug, "enospc_debug"}, 407416a7202SDavid Sterba {Opt_noenospc_debug, "noenospc_debug"}, 408d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 409d0bd4560SJosef Bacik {Opt_fragment_data, "fragment=data"}, 410d0bd4560SJosef Bacik {Opt_fragment_metadata, "fragment=metadata"}, 411d0bd4560SJosef Bacik {Opt_fragment_all, "fragment=all"}, 412d0bd4560SJosef Bacik #endif 413fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 414fb592373SJosef Bacik {Opt_ref_verify, "ref_verify"}, 415fb592373SJosef Bacik #endif 41633268eafSJosef Bacik {Opt_err, NULL}, 41795e05289SChris Mason }; 41895e05289SChris Mason 419edf24abeSChristoph Hellwig /* 420edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 421edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 42249b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 423edf24abeSChristoph Hellwig */ 4242ff7e61eSJeff Mahoney int btrfs_parse_options(struct btrfs_fs_info *info, char *options, 42596da0919SQu Wenruo unsigned long new_flags) 42695e05289SChris Mason { 42795e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 428e215772cSMisono, Tomohiro char *p, *num; 42973bc1876SJosef Bacik u64 cache_gen; 4304543df7eSChris Mason int intarg; 431a7a3f7caSSage Weil int ret = 0; 432261507a0SLi Zefan char *compress_type; 433261507a0SLi Zefan bool compress_force = false; 434b7c47bbbSTsutomu Itoh enum btrfs_compression_type saved_compress_type; 435b7c47bbbSTsutomu Itoh bool saved_compress_force; 436b7c47bbbSTsutomu Itoh int no_compress = 0; 437b6cda9bcSChris Mason 4380b246afaSJeff Mahoney cache_gen = btrfs_super_cache_generation(info->super_copy); 4390b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) 44070f6d82eSOmar Sandoval btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); 44170f6d82eSOmar Sandoval else if (cache_gen) 44273bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 44373bc1876SJosef Bacik 44496da0919SQu Wenruo /* 44596da0919SQu Wenruo * Even the options are empty, we still need to do extra check 44696da0919SQu Wenruo * against new flags 44796da0919SQu Wenruo */ 44895e05289SChris Mason if (!options) 44996da0919SQu Wenruo goto check; 45095e05289SChris Mason 45195e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 45295e05289SChris Mason int token; 45395e05289SChris Mason if (!*p) 45495e05289SChris Mason continue; 45595e05289SChris Mason 45695e05289SChris Mason token = match_token(p, tokens, args); 45795e05289SChris Mason switch (token) { 458dfe25020SChris Mason case Opt_degraded: 4590b246afaSJeff Mahoney btrfs_info(info, "allowing degraded mounts"); 460dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 461dfe25020SChris Mason break; 46295e05289SChris Mason case Opt_subvol: 46337becec9SOmar Sandoval case Opt_subvol_empty: 46473f73415SJosef Bacik case Opt_subvolid: 465e15d0542SXin Zhong case Opt_subvolrootid: 46643e570b0SChristoph Hellwig case Opt_device: 467edf24abeSChristoph Hellwig /* 468d7407606SMisono, Tomohiro * These are parsed by btrfs_parse_subvol_options 469d7407606SMisono, Tomohiro * and btrfs_parse_early_options 470edf24abeSChristoph Hellwig * and can be happily ignored here. 471edf24abeSChristoph Hellwig */ 47295e05289SChris Mason break; 473b6cda9bcSChris Mason case Opt_nodatasum: 4743cdde224SJeff Mahoney btrfs_set_and_info(info, NODATASUM, 47507802534SQu Wenruo "setting nodatasum"); 476be20aa9dSChris Mason break; 477d399167dSQu Wenruo case Opt_datasum: 4783cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) { 4793cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 4800b246afaSJeff Mahoney btrfs_info(info, 4815d163e0eSJeff Mahoney "setting datasum, datacow enabled"); 482d399167dSQu Wenruo else 4830b246afaSJeff Mahoney btrfs_info(info, "setting datasum"); 48407802534SQu Wenruo } 485d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 486d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 487d399167dSQu Wenruo break; 488be20aa9dSChris Mason case Opt_nodatacow: 4893cdde224SJeff Mahoney if (!btrfs_test_opt(info, NODATACOW)) { 4903cdde224SJeff Mahoney if (!btrfs_test_opt(info, COMPRESS) || 4913cdde224SJeff Mahoney !btrfs_test_opt(info, FORCE_COMPRESS)) { 4920b246afaSJeff Mahoney btrfs_info(info, 493efe120a0SFrank Holton "setting nodatacow, compression disabled"); 494bedb2ccaSAndrei Popa } else { 4950b246afaSJeff Mahoney btrfs_info(info, "setting nodatacow"); 496bedb2ccaSAndrei Popa } 49707802534SQu Wenruo } 498bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 499bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 500be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 501be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 502b6cda9bcSChris Mason break; 503a258af7aSQu Wenruo case Opt_datacow: 5043cdde224SJeff Mahoney btrfs_clear_and_info(info, NODATACOW, 50507802534SQu Wenruo "setting datacow"); 506a258af7aSQu Wenruo break; 507a555f810SChris Mason case Opt_compress_force: 508261507a0SLi Zefan case Opt_compress_force_type: 509261507a0SLi Zefan compress_force = true; 5101c697d4aSEric Sandeen /* Fallthrough */ 511261507a0SLi Zefan case Opt_compress: 512261507a0SLi Zefan case Opt_compress_type: 5133cdde224SJeff Mahoney saved_compress_type = btrfs_test_opt(info, 5143cdde224SJeff Mahoney COMPRESS) ? 515b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 516b7c47bbbSTsutomu Itoh saved_compress_force = 5173cdde224SJeff Mahoney btrfs_test_opt(info, FORCE_COMPRESS); 518261507a0SLi Zefan if (token == Opt_compress || 519261507a0SLi Zefan token == Opt_compress_force || 520a7164fa4SDavid Sterba strncmp(args[0].from, "zlib", 4) == 0) { 521261507a0SLi Zefan compress_type = "zlib"; 522eae8d825SQu Wenruo 523261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 524eae8d825SQu Wenruo info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; 525eae8d825SQu Wenruo /* 526eae8d825SQu Wenruo * args[0] contains uninitialized data since 527eae8d825SQu Wenruo * for these tokens we don't expect any 528eae8d825SQu Wenruo * parameter. 529eae8d825SQu Wenruo */ 530eae8d825SQu Wenruo if (token != Opt_compress && 531eae8d825SQu Wenruo token != Opt_compress_force) 532f51d2b59SDavid Sterba info->compress_level = 533f51d2b59SDavid Sterba btrfs_compress_str2level(args[0].from); 534063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 535bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 536bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 537b7c47bbbSTsutomu Itoh no_compress = 0; 538a7164fa4SDavid Sterba } else if (strncmp(args[0].from, "lzo", 3) == 0) { 539a6fa6faeSLi Zefan compress_type = "lzo"; 540a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 541063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 542bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 543bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 5442b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 545b7c47bbbSTsutomu Itoh no_compress = 0; 5465c1aab1dSNick Terrell } else if (strcmp(args[0].from, "zstd") == 0) { 5475c1aab1dSNick Terrell compress_type = "zstd"; 5485c1aab1dSNick Terrell info->compress_type = BTRFS_COMPRESS_ZSTD; 5495c1aab1dSNick Terrell btrfs_set_opt(info->mount_opt, COMPRESS); 5505c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATACOW); 5515c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATASUM); 5525c1aab1dSNick Terrell btrfs_set_fs_incompat(info, COMPRESS_ZSTD); 5535c1aab1dSNick Terrell no_compress = 0; 554063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 555063849eaSArnd Hannemann compress_type = "no"; 556063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 557063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 558063849eaSArnd Hannemann compress_force = false; 559b7c47bbbSTsutomu Itoh no_compress++; 560261507a0SLi Zefan } else { 561261507a0SLi Zefan ret = -EINVAL; 562261507a0SLi Zefan goto out; 563261507a0SLi Zefan } 564261507a0SLi Zefan 565261507a0SLi Zefan if (compress_force) { 566b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 567143f3636SDavid Sterba } else { 5684027e0f4SWang Shilong /* 5694027e0f4SWang Shilong * If we remount from compress-force=xxx to 5704027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 5714027e0f4SWang Shilong * flag, otherwise, there is no way for users 5724027e0f4SWang Shilong * to disable forcible compression separately. 5734027e0f4SWang Shilong */ 5744027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 575a7e252afSMiao Xie } 5763cdde224SJeff Mahoney if ((btrfs_test_opt(info, COMPRESS) && 577b7c47bbbSTsutomu Itoh (info->compress_type != saved_compress_type || 578b7c47bbbSTsutomu Itoh compress_force != saved_compress_force)) || 5793cdde224SJeff Mahoney (!btrfs_test_opt(info, COMPRESS) && 580b7c47bbbSTsutomu Itoh no_compress == 1)) { 581f51d2b59SDavid Sterba btrfs_info(info, "%s %s compression, level %d", 582b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 583f51d2b59SDavid Sterba compress_type, info->compress_level); 584b7c47bbbSTsutomu Itoh } 585b7c47bbbSTsutomu Itoh compress_force = false; 586a555f810SChris Mason break; 587e18e4809SChris Mason case Opt_ssd: 5883cdde224SJeff Mahoney btrfs_set_and_info(info, SSD, 589583b7231SHans van Kranenburg "enabling ssd optimizations"); 590951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 591e18e4809SChris Mason break; 592451d7585SChris Mason case Opt_ssd_spread: 593583b7231SHans van Kranenburg btrfs_set_and_info(info, SSD, 594583b7231SHans van Kranenburg "enabling ssd optimizations"); 5953cdde224SJeff Mahoney btrfs_set_and_info(info, SSD_SPREAD, 596583b7231SHans van Kranenburg "using spread ssd allocation scheme"); 597951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 598451d7585SChris Mason break; 5993b30c22fSChris Mason case Opt_nossd: 600583b7231SHans van Kranenburg btrfs_set_opt(info->mount_opt, NOSSD); 601583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD, 602583b7231SHans van Kranenburg "not using ssd optimizations"); 60362b8e077SHoward McLauchlan /* Fallthrough */ 60462b8e077SHoward McLauchlan case Opt_nossd_spread: 605583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD_SPREAD, 606583b7231SHans van Kranenburg "not using spread ssd allocation scheme"); 6073b30c22fSChris Mason break; 608842bef58SQu Wenruo case Opt_barrier: 6093cdde224SJeff Mahoney btrfs_clear_and_info(info, NOBARRIER, 61007802534SQu Wenruo "turning on barriers"); 611842bef58SQu Wenruo break; 61221ad10cfSChris Mason case Opt_nobarrier: 6133cdde224SJeff Mahoney btrfs_set_and_info(info, NOBARRIER, 61407802534SQu Wenruo "turning off barriers"); 61521ad10cfSChris Mason break; 6164543df7eSChris Mason case Opt_thread_pool: 6172c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6182c334e87SWang Shilong if (ret) { 6192c334e87SWang Shilong goto out; 620f7b885beSAnand Jain } else if (intarg == 0) { 6212c334e87SWang Shilong ret = -EINVAL; 6222c334e87SWang Shilong goto out; 6232c334e87SWang Shilong } 624f7b885beSAnand Jain info->thread_pool_size = intarg; 6254543df7eSChris Mason break; 6266f568d35SChris Mason case Opt_max_inline: 627edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 6286f568d35SChris Mason if (num) { 62991748467SAkinobu Mita info->max_inline = memparse(num, NULL); 6306f568d35SChris Mason kfree(num); 6316f568d35SChris Mason 63215ada040SChris Mason if (info->max_inline) { 633feb5f965SMitch Harder info->max_inline = min_t(u64, 63415ada040SChris Mason info->max_inline, 6350b246afaSJeff Mahoney info->sectorsize); 63615ada040SChris Mason } 6370b246afaSJeff Mahoney btrfs_info(info, "max_inline at %llu", 638c1c9ff7cSGeert Uytterhoeven info->max_inline); 6392c334e87SWang Shilong } else { 6402c334e87SWang Shilong ret = -ENOMEM; 6412c334e87SWang Shilong goto out; 6426f568d35SChris Mason } 6436f568d35SChris Mason break; 6448f662a76SChris Mason case Opt_alloc_start: 6450d0c71b3SDavid Sterba btrfs_info(info, 6460d0c71b3SDavid Sterba "option alloc_start is obsolete, ignored"); 6478f662a76SChris Mason break; 648bd0330adSQu Wenruo case Opt_acl: 64945ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 6501751e8a6SLinus Torvalds info->sb->s_flags |= SB_POSIXACL; 651bd0330adSQu Wenruo break; 65245ff35d6SGuangliang Zhao #else 6530b246afaSJeff Mahoney btrfs_err(info, "support for ACL not compiled in!"); 65445ff35d6SGuangliang Zhao ret = -EINVAL; 65545ff35d6SGuangliang Zhao goto out; 65645ff35d6SGuangliang Zhao #endif 65733268eafSJosef Bacik case Opt_noacl: 6581751e8a6SLinus Torvalds info->sb->s_flags &= ~SB_POSIXACL; 65933268eafSJosef Bacik break; 6603a5e1404SSage Weil case Opt_notreelog: 6613cdde224SJeff Mahoney btrfs_set_and_info(info, NOTREELOG, 66207802534SQu Wenruo "disabling tree log"); 6633a5e1404SSage Weil break; 664a88998f2SQu Wenruo case Opt_treelog: 6653cdde224SJeff Mahoney btrfs_clear_and_info(info, NOTREELOG, 66607802534SQu Wenruo "enabling tree log"); 667a88998f2SQu Wenruo break; 668fed8f166SQu Wenruo case Opt_norecovery: 66996da0919SQu Wenruo case Opt_nologreplay: 6703cdde224SJeff Mahoney btrfs_set_and_info(info, NOLOGREPLAY, 67196da0919SQu Wenruo "disabling log replay at mount time"); 67296da0919SQu Wenruo break; 673dccae999SSage Weil case Opt_flushoncommit: 6743cdde224SJeff Mahoney btrfs_set_and_info(info, FLUSHONCOMMIT, 67507802534SQu Wenruo "turning on flush-on-commit"); 676dccae999SSage Weil break; 6772c9ee856SQu Wenruo case Opt_noflushoncommit: 6783cdde224SJeff Mahoney btrfs_clear_and_info(info, FLUSHONCOMMIT, 67907802534SQu Wenruo "turning off flush-on-commit"); 6802c9ee856SQu Wenruo break; 68197e728d4SJosef Bacik case Opt_ratio: 6822c334e87SWang Shilong ret = match_int(&args[0], &intarg); 683764cb8b4SAnand Jain if (ret) 6842c334e87SWang Shilong goto out; 68597e728d4SJosef Bacik info->metadata_ratio = intarg; 686764cb8b4SAnand Jain btrfs_info(info, "metadata ratio %u", 68797e728d4SJosef Bacik info->metadata_ratio); 68897e728d4SJosef Bacik break; 689e244a0aeSChristoph Hellwig case Opt_discard: 6903cdde224SJeff Mahoney btrfs_set_and_info(info, DISCARD, 69107802534SQu Wenruo "turning on discard"); 692e244a0aeSChristoph Hellwig break; 693e07a2adeSQu Wenruo case Opt_nodiscard: 6943cdde224SJeff Mahoney btrfs_clear_and_info(info, DISCARD, 69507802534SQu Wenruo "turning off discard"); 696e07a2adeSQu Wenruo break; 6970af3d00bSJosef Bacik case Opt_space_cache: 69870f6d82eSOmar Sandoval case Opt_space_cache_version: 69970f6d82eSOmar Sandoval if (token == Opt_space_cache || 70070f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 7010b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 70270f6d82eSOmar Sandoval FREE_SPACE_TREE); 7033cdde224SJeff Mahoney btrfs_set_and_info(info, SPACE_CACHE, 70407802534SQu Wenruo "enabling disk space caching"); 70570f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 7060b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 70770f6d82eSOmar Sandoval SPACE_CACHE); 7080b246afaSJeff Mahoney btrfs_set_and_info(info, FREE_SPACE_TREE, 70970f6d82eSOmar Sandoval "enabling free space tree"); 71070f6d82eSOmar Sandoval } else { 71170f6d82eSOmar Sandoval ret = -EINVAL; 71270f6d82eSOmar Sandoval goto out; 71370f6d82eSOmar Sandoval } 7140de90876SJosef Bacik break; 715f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 716f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 717f420ee1eSStefan Behrens break; 71873bc1876SJosef Bacik case Opt_no_space_cache: 7193cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) { 7200b246afaSJeff Mahoney btrfs_clear_and_info(info, SPACE_CACHE, 72107802534SQu Wenruo "disabling disk space caching"); 72270f6d82eSOmar Sandoval } 7233cdde224SJeff Mahoney if (btrfs_test_opt(info, FREE_SPACE_TREE)) { 7240b246afaSJeff Mahoney btrfs_clear_and_info(info, FREE_SPACE_TREE, 72570f6d82eSOmar Sandoval "disabling free space tree"); 72670f6d82eSOmar Sandoval } 72773bc1876SJosef Bacik break; 7284b9465cbSChris Mason case Opt_inode_cache: 7297e1876acSDavid Sterba btrfs_set_pending_and_info(info, INODE_MAP_CACHE, 73007802534SQu Wenruo "enabling inode map caching"); 7313818aea2SQu Wenruo break; 7323818aea2SQu Wenruo case Opt_noinode_cache: 7337e1876acSDavid Sterba btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, 73407802534SQu Wenruo "disabling inode map caching"); 7354b9465cbSChris Mason break; 73688c2ba3bSJosef Bacik case Opt_clear_cache: 7373cdde224SJeff Mahoney btrfs_set_and_info(info, CLEAR_CACHE, 73807802534SQu Wenruo "force clearing of disk cache"); 7390af3d00bSJosef Bacik break; 7404260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 7414260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 7424260f7c7SSage Weil break; 74391435650SChris Mason case Opt_enospc_debug: 74491435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 74591435650SChris Mason break; 74653036293SQu Wenruo case Opt_noenospc_debug: 74753036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 74853036293SQu Wenruo break; 7494cb5300bSChris Mason case Opt_defrag: 7503cdde224SJeff Mahoney btrfs_set_and_info(info, AUTO_DEFRAG, 75107802534SQu Wenruo "enabling auto defrag"); 7524cb5300bSChris Mason break; 753fc0ca9afSQu Wenruo case Opt_nodefrag: 7543cdde224SJeff Mahoney btrfs_clear_and_info(info, AUTO_DEFRAG, 75507802534SQu Wenruo "disabling auto defrag"); 756fc0ca9afSQu Wenruo break; 757af31f5e5SChris Mason case Opt_recovery: 7580b246afaSJeff Mahoney btrfs_warn(info, 7598dcddfa0SQu Wenruo "'recovery' is deprecated, use 'usebackuproot' instead"); 760acd43e3cSBart Van Assche /* fall through */ 7618dcddfa0SQu Wenruo case Opt_usebackuproot: 7620b246afaSJeff Mahoney btrfs_info(info, 7638dcddfa0SQu Wenruo "trying to use backup root at mount time"); 7648dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 765af31f5e5SChris Mason break; 7669555c6c1SIlya Dryomov case Opt_skip_balance: 7679555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 7689555c6c1SIlya Dryomov break; 76921adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 77021adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 7710b246afaSJeff Mahoney btrfs_info(info, 772efe120a0SFrank Holton "enabling check integrity including extent data"); 77321adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 77421adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 77521adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 77621adbd5cSStefan Behrens break; 77721adbd5cSStefan Behrens case Opt_check_integrity: 7780b246afaSJeff Mahoney btrfs_info(info, "enabling check integrity"); 77921adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 78021adbd5cSStefan Behrens break; 78121adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7822c334e87SWang Shilong ret = match_int(&args[0], &intarg); 78302453bdeSAnand Jain if (ret) 7842c334e87SWang Shilong goto out; 78521adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 78602453bdeSAnand Jain btrfs_info(info, "check_integrity_print_mask 0x%x", 78721adbd5cSStefan Behrens info->check_integrity_print_mask); 78821adbd5cSStefan Behrens break; 78921adbd5cSStefan Behrens #else 79021adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 79121adbd5cSStefan Behrens case Opt_check_integrity: 79221adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7930b246afaSJeff Mahoney btrfs_err(info, 794efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 79521adbd5cSStefan Behrens ret = -EINVAL; 79621adbd5cSStefan Behrens goto out; 79721adbd5cSStefan Behrens #endif 7988c342930SJeff Mahoney case Opt_fatal_errors: 7998c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 8008c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 8018c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 8028c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 8038c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 8048c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 8058c342930SJeff Mahoney else { 8068c342930SJeff Mahoney ret = -EINVAL; 8078c342930SJeff Mahoney goto out; 8088c342930SJeff Mahoney } 8098c342930SJeff Mahoney break; 8108b87dc17SDavid Sterba case Opt_commit_interval: 8118b87dc17SDavid Sterba intarg = 0; 8128b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 813d3740608SAnand Jain if (ret) 8148b87dc17SDavid Sterba goto out; 815d3740608SAnand Jain if (intarg == 0) { 816d3740608SAnand Jain btrfs_info(info, 817d3740608SAnand Jain "using default commit interval %us", 818d3740608SAnand Jain BTRFS_DEFAULT_COMMIT_INTERVAL); 819d3740608SAnand Jain intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; 820d3740608SAnand Jain } else if (intarg > 300) { 821d3740608SAnand Jain btrfs_warn(info, "excessive commit interval %d", 8228b87dc17SDavid Sterba intarg); 8238b87dc17SDavid Sterba } 8248b87dc17SDavid Sterba info->commit_interval = intarg; 8258b87dc17SDavid Sterba break; 826d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 827d0bd4560SJosef Bacik case Opt_fragment_all: 8280b246afaSJeff Mahoney btrfs_info(info, "fragmenting all space"); 829d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 830d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 831d0bd4560SJosef Bacik break; 832d0bd4560SJosef Bacik case Opt_fragment_metadata: 8330b246afaSJeff Mahoney btrfs_info(info, "fragmenting metadata"); 834d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 835d0bd4560SJosef Bacik FRAGMENT_METADATA); 836d0bd4560SJosef Bacik break; 837d0bd4560SJosef Bacik case Opt_fragment_data: 8380b246afaSJeff Mahoney btrfs_info(info, "fragmenting data"); 839d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 840d0bd4560SJosef Bacik break; 841d0bd4560SJosef Bacik #endif 842fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 843fb592373SJosef Bacik case Opt_ref_verify: 844fb592373SJosef Bacik btrfs_info(info, "doing ref verification"); 845fb592373SJosef Bacik btrfs_set_opt(info->mount_opt, REF_VERIFY); 846fb592373SJosef Bacik break; 847fb592373SJosef Bacik #endif 848a7a3f7caSSage Weil case Opt_err: 8490b246afaSJeff Mahoney btrfs_info(info, "unrecognized mount option '%s'", p); 850a7a3f7caSSage Weil ret = -EINVAL; 851a7a3f7caSSage Weil goto out; 85295e05289SChris Mason default: 853be20aa9dSChris Mason break; 85495e05289SChris Mason } 85595e05289SChris Mason } 85696da0919SQu Wenruo check: 85796da0919SQu Wenruo /* 85896da0919SQu Wenruo * Extra check for current option against current flag 85996da0919SQu Wenruo */ 8601751e8a6SLinus Torvalds if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) { 8610b246afaSJeff Mahoney btrfs_err(info, 86296da0919SQu Wenruo "nologreplay must be used with ro mount option"); 86396da0919SQu Wenruo ret = -EINVAL; 86496da0919SQu Wenruo } 865a7a3f7caSSage Weil out: 8660b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && 8673cdde224SJeff Mahoney !btrfs_test_opt(info, FREE_SPACE_TREE) && 8683cdde224SJeff Mahoney !btrfs_test_opt(info, CLEAR_CACHE)) { 8690b246afaSJeff Mahoney btrfs_err(info, "cannot disable free space tree"); 87070f6d82eSOmar Sandoval ret = -EINVAL; 87170f6d82eSOmar Sandoval 87270f6d82eSOmar Sandoval } 8733cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, SPACE_CACHE)) 8740b246afaSJeff Mahoney btrfs_info(info, "disk space caching is enabled"); 8753cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) 8760b246afaSJeff Mahoney btrfs_info(info, "using free space tree"); 877a7a3f7caSSage Weil return ret; 878edf24abeSChristoph Hellwig } 879edf24abeSChristoph Hellwig 880edf24abeSChristoph Hellwig /* 881edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 882edf24abeSChristoph Hellwig * 883edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 884edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 885edf24abeSChristoph Hellwig */ 88697288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 887d7407606SMisono, Tomohiro void *holder, struct btrfs_fs_devices **fs_devices) 888edf24abeSChristoph Hellwig { 889edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 89083c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 891d7407606SMisono, Tomohiro int error = 0; 892d7407606SMisono, Tomohiro 893*5139cff5SDavid Sterba lockdep_assert_held(&uuid_mutex); 894*5139cff5SDavid Sterba 895d7407606SMisono, Tomohiro if (!options) 896d7407606SMisono, Tomohiro return 0; 897d7407606SMisono, Tomohiro 898d7407606SMisono, Tomohiro /* 899d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because btrfs_parse_options 900d7407606SMisono, Tomohiro * gets called later 901d7407606SMisono, Tomohiro */ 902d7407606SMisono, Tomohiro opts = kstrdup(options, GFP_KERNEL); 903d7407606SMisono, Tomohiro if (!opts) 904d7407606SMisono, Tomohiro return -ENOMEM; 905d7407606SMisono, Tomohiro orig = opts; 906d7407606SMisono, Tomohiro 907d7407606SMisono, Tomohiro while ((p = strsep(&opts, ",")) != NULL) { 908d7407606SMisono, Tomohiro int token; 909d7407606SMisono, Tomohiro 910d7407606SMisono, Tomohiro if (!*p) 911d7407606SMisono, Tomohiro continue; 912d7407606SMisono, Tomohiro 913d7407606SMisono, Tomohiro token = match_token(p, tokens, args); 914d7407606SMisono, Tomohiro if (token == Opt_device) { 915d7407606SMisono, Tomohiro device_name = match_strdup(&args[0]); 916d7407606SMisono, Tomohiro if (!device_name) { 917d7407606SMisono, Tomohiro error = -ENOMEM; 918d7407606SMisono, Tomohiro goto out; 919d7407606SMisono, Tomohiro } 920d7407606SMisono, Tomohiro error = btrfs_scan_one_device(device_name, 921d7407606SMisono, Tomohiro flags, holder, fs_devices); 922d7407606SMisono, Tomohiro kfree(device_name); 923d7407606SMisono, Tomohiro if (error) 924d7407606SMisono, Tomohiro goto out; 925d7407606SMisono, Tomohiro } 926d7407606SMisono, Tomohiro } 927d7407606SMisono, Tomohiro 928d7407606SMisono, Tomohiro out: 929d7407606SMisono, Tomohiro kfree(orig); 930d7407606SMisono, Tomohiro return error; 931d7407606SMisono, Tomohiro } 932d7407606SMisono, Tomohiro 933d7407606SMisono, Tomohiro /* 934d7407606SMisono, Tomohiro * Parse mount options that are related to subvolume id 935d7407606SMisono, Tomohiro * 936d7407606SMisono, Tomohiro * The value is later passed to mount_subvol() 937d7407606SMisono, Tomohiro */ 93893b9bcdfSGu Jinxiang static int btrfs_parse_subvol_options(const char *options, char **subvol_name, 93993b9bcdfSGu Jinxiang u64 *subvol_objectid) 940d7407606SMisono, Tomohiro { 941d7407606SMisono, Tomohiro substring_t args[MAX_OPT_ARGS]; 942d7407606SMisono, Tomohiro char *opts, *orig, *p; 943edf24abeSChristoph Hellwig int error = 0; 944ccb0e7d1SAnand Jain u64 subvolid; 945edf24abeSChristoph Hellwig 946edf24abeSChristoph Hellwig if (!options) 947830c4adbSJosef Bacik return 0; 948edf24abeSChristoph Hellwig 949edf24abeSChristoph Hellwig /* 950d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because 951d7407606SMisono, Tomohiro * btrfs_parse_early_options gets called later 952edf24abeSChristoph Hellwig */ 953edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 954edf24abeSChristoph Hellwig if (!opts) 955edf24abeSChristoph Hellwig return -ENOMEM; 9563f3d0bc0STero Roponen orig = opts; 957edf24abeSChristoph Hellwig 958edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 959edf24abeSChristoph Hellwig int token; 960edf24abeSChristoph Hellwig if (!*p) 961edf24abeSChristoph Hellwig continue; 962edf24abeSChristoph Hellwig 963edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 964edf24abeSChristoph Hellwig switch (token) { 965edf24abeSChristoph Hellwig case Opt_subvol: 966a90e8b6fSIlya Dryomov kfree(*subvol_name); 967edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 9682c334e87SWang Shilong if (!*subvol_name) { 9692c334e87SWang Shilong error = -ENOMEM; 9702c334e87SWang Shilong goto out; 9712c334e87SWang Shilong } 972edf24abeSChristoph Hellwig break; 97373f73415SJosef Bacik case Opt_subvolid: 974ccb0e7d1SAnand Jain error = match_u64(&args[0], &subvolid); 975ccb0e7d1SAnand Jain if (error) 9762c334e87SWang Shilong goto out; 977ccb0e7d1SAnand Jain 978ccb0e7d1SAnand Jain /* we want the original fs_tree */ 979ccb0e7d1SAnand Jain if (subvolid == 0) 980ccb0e7d1SAnand Jain subvolid = BTRFS_FS_TREE_OBJECTID; 981ccb0e7d1SAnand Jain 982ccb0e7d1SAnand Jain *subvol_objectid = subvolid; 98373f73415SJosef Bacik break; 984e15d0542SXin Zhong case Opt_subvolrootid: 98562e85577SJeff Mahoney pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n"); 986e15d0542SXin Zhong break; 987edf24abeSChristoph Hellwig default: 988edf24abeSChristoph Hellwig break; 989edf24abeSChristoph Hellwig } 990edf24abeSChristoph Hellwig } 991edf24abeSChristoph Hellwig 992edf24abeSChristoph Hellwig out: 993830c4adbSJosef Bacik kfree(orig); 994edf24abeSChristoph Hellwig return error; 99595e05289SChris Mason } 99695e05289SChris Mason 99705dbe683SOmar Sandoval static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 99873f73415SJosef Bacik u64 subvol_objectid) 99973f73415SJosef Bacik { 1000815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 100105dbe683SOmar Sandoval struct btrfs_root *fs_root; 100205dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 100305dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 100405dbe683SOmar Sandoval struct btrfs_key key; 100505dbe683SOmar Sandoval struct btrfs_path *path = NULL; 100605dbe683SOmar Sandoval char *name = NULL, *ptr; 100705dbe683SOmar Sandoval u64 dirid; 100805dbe683SOmar Sandoval int len; 100905dbe683SOmar Sandoval int ret; 101005dbe683SOmar Sandoval 101105dbe683SOmar Sandoval path = btrfs_alloc_path(); 101205dbe683SOmar Sandoval if (!path) { 101305dbe683SOmar Sandoval ret = -ENOMEM; 101405dbe683SOmar Sandoval goto err; 101505dbe683SOmar Sandoval } 101605dbe683SOmar Sandoval path->leave_spinning = 1; 101705dbe683SOmar Sandoval 10183ec83621SDavid Sterba name = kmalloc(PATH_MAX, GFP_KERNEL); 101905dbe683SOmar Sandoval if (!name) { 102005dbe683SOmar Sandoval ret = -ENOMEM; 102105dbe683SOmar Sandoval goto err; 102205dbe683SOmar Sandoval } 102305dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 102405dbe683SOmar Sandoval ptr[0] = '\0'; 102505dbe683SOmar Sandoval 102605dbe683SOmar Sandoval /* 102705dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 102805dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 102905dbe683SOmar Sandoval */ 103005dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 103105dbe683SOmar Sandoval key.objectid = subvol_objectid; 103205dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 103305dbe683SOmar Sandoval key.offset = (u64)-1; 103405dbe683SOmar Sandoval 103505dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 103605dbe683SOmar Sandoval if (ret < 0) { 103705dbe683SOmar Sandoval goto err; 103805dbe683SOmar Sandoval } else if (ret > 0) { 103905dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 104005dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 104105dbe683SOmar Sandoval if (ret < 0) { 104205dbe683SOmar Sandoval goto err; 104305dbe683SOmar Sandoval } else if (ret > 0) { 104405dbe683SOmar Sandoval ret = -ENOENT; 104505dbe683SOmar Sandoval goto err; 104605dbe683SOmar Sandoval } 104705dbe683SOmar Sandoval } 104805dbe683SOmar Sandoval 104905dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 105005dbe683SOmar Sandoval subvol_objectid = key.offset; 105105dbe683SOmar Sandoval 105205dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 105305dbe683SOmar Sandoval struct btrfs_root_ref); 105405dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 105505dbe683SOmar Sandoval ptr -= len + 1; 105605dbe683SOmar Sandoval if (ptr < name) { 105705dbe683SOmar Sandoval ret = -ENAMETOOLONG; 105805dbe683SOmar Sandoval goto err; 105905dbe683SOmar Sandoval } 106005dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 106105dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 106205dbe683SOmar Sandoval ptr[0] = '/'; 106305dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 106405dbe683SOmar Sandoval btrfs_release_path(path); 106505dbe683SOmar Sandoval 106605dbe683SOmar Sandoval key.objectid = subvol_objectid; 106705dbe683SOmar Sandoval key.type = BTRFS_ROOT_ITEM_KEY; 106805dbe683SOmar Sandoval key.offset = (u64)-1; 106905dbe683SOmar Sandoval fs_root = btrfs_read_fs_root_no_name(fs_info, &key); 107005dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 107105dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 107205dbe683SOmar Sandoval goto err; 107305dbe683SOmar Sandoval } 107405dbe683SOmar Sandoval 107505dbe683SOmar Sandoval /* 107605dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 107705dbe683SOmar Sandoval * root directory. 107805dbe683SOmar Sandoval */ 107905dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 108005dbe683SOmar Sandoval key.objectid = dirid; 108105dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 108205dbe683SOmar Sandoval key.offset = (u64)-1; 108305dbe683SOmar Sandoval 108405dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 108505dbe683SOmar Sandoval if (ret < 0) { 108605dbe683SOmar Sandoval goto err; 108705dbe683SOmar Sandoval } else if (ret > 0) { 108805dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 108905dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 109005dbe683SOmar Sandoval if (ret < 0) { 109105dbe683SOmar Sandoval goto err; 109205dbe683SOmar Sandoval } else if (ret > 0) { 109305dbe683SOmar Sandoval ret = -ENOENT; 109405dbe683SOmar Sandoval goto err; 109505dbe683SOmar Sandoval } 109605dbe683SOmar Sandoval } 109705dbe683SOmar Sandoval 109805dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 109905dbe683SOmar Sandoval dirid = key.offset; 110005dbe683SOmar Sandoval 110105dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 110205dbe683SOmar Sandoval path->slots[0], 110305dbe683SOmar Sandoval struct btrfs_inode_ref); 110405dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 110505dbe683SOmar Sandoval inode_ref); 110605dbe683SOmar Sandoval ptr -= len + 1; 110705dbe683SOmar Sandoval if (ptr < name) { 110805dbe683SOmar Sandoval ret = -ENAMETOOLONG; 110905dbe683SOmar Sandoval goto err; 111005dbe683SOmar Sandoval } 111105dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 111205dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 111305dbe683SOmar Sandoval ptr[0] = '/'; 111405dbe683SOmar Sandoval btrfs_release_path(path); 111505dbe683SOmar Sandoval } 111605dbe683SOmar Sandoval } 111705dbe683SOmar Sandoval 111805dbe683SOmar Sandoval btrfs_free_path(path); 111905dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 112005dbe683SOmar Sandoval name[0] = '/'; 112105dbe683SOmar Sandoval name[1] = '\0'; 112205dbe683SOmar Sandoval } else { 112305dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 112405dbe683SOmar Sandoval } 112505dbe683SOmar Sandoval return name; 112605dbe683SOmar Sandoval 112705dbe683SOmar Sandoval err: 112805dbe683SOmar Sandoval btrfs_free_path(path); 112905dbe683SOmar Sandoval kfree(name); 113005dbe683SOmar Sandoval return ERR_PTR(ret); 113105dbe683SOmar Sandoval } 113205dbe683SOmar Sandoval 113305dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 113405dbe683SOmar Sandoval { 113505dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 113673f73415SJosef Bacik struct btrfs_dir_item *di; 113773f73415SJosef Bacik struct btrfs_path *path; 113873f73415SJosef Bacik struct btrfs_key location; 113973f73415SJosef Bacik u64 dir_id; 114073f73415SJosef Bacik 114173f73415SJosef Bacik path = btrfs_alloc_path(); 114273f73415SJosef Bacik if (!path) 114305dbe683SOmar Sandoval return -ENOMEM; 114473f73415SJosef Bacik path->leave_spinning = 1; 114573f73415SJosef Bacik 114673f73415SJosef Bacik /* 114773f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 114873f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 114973f73415SJosef Bacik * to mount. 115073f73415SJosef Bacik */ 1151815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 115273f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1153b0839166SJulia Lawall if (IS_ERR(di)) { 1154b0839166SJulia Lawall btrfs_free_path(path); 115505dbe683SOmar Sandoval return PTR_ERR(di); 1156b0839166SJulia Lawall } 115773f73415SJosef Bacik if (!di) { 115873f73415SJosef Bacik /* 115973f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 116073f73415SJosef Bacik * it's always been there, but don't freak out, just try and 116105dbe683SOmar Sandoval * mount the top-level subvolume. 116273f73415SJosef Bacik */ 116373f73415SJosef Bacik btrfs_free_path(path); 116405dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 116505dbe683SOmar Sandoval return 0; 116673f73415SJosef Bacik } 116773f73415SJosef Bacik 116873f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 116973f73415SJosef Bacik btrfs_free_path(path); 117005dbe683SOmar Sandoval *objectid = location.objectid; 117105dbe683SOmar Sandoval return 0; 117273f73415SJosef Bacik } 117373f73415SJosef Bacik 11748a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 11758a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 117656e033a7SDavid Sterba void *data) 11772e635a27SChris Mason { 11782e635a27SChris Mason struct inode *inode; 1179815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 11805d4f98a2SYan Zheng struct btrfs_key key; 118139279cc3SChris Mason int err; 11822e635a27SChris Mason 11832e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 11842e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1185e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1186af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1187be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 11885103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 11892e635a27SChris Mason sb->s_time_gran = 1; 11900eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 11911751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 119249cf6f45SChris Ball #endif 1193357fdad0SMatthew Garrett sb->s_flags |= SB_I_VERSION; 1194da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 11959e11ceeeSJan Kara 11969e11ceeeSJan Kara err = super_setup_bdi(sb); 11979e11ceeeSJan Kara if (err) { 11989e11ceeeSJan Kara btrfs_err(fs_info, "super_setup_bdi failed"); 11999e11ceeeSJan Kara return err; 12009e11ceeeSJan Kara } 12019e11ceeeSJan Kara 1202ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1203ad2b2c80SAl Viro if (err) { 1204ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "open_ctree failed"); 1205ad2b2c80SAl Viro return err; 1206e20d96d6SChris Mason } 1207b888db2bSChris Mason 12085d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 12095d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 12105d4f98a2SYan Zheng key.offset = 0; 121198c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 12125d4f98a2SYan Zheng if (IS_ERR(inode)) { 12135d4f98a2SYan Zheng err = PTR_ERR(inode); 121439279cc3SChris Mason goto fail_close; 121539279cc3SChris Mason } 12162e635a27SChris Mason 121748fde701SAl Viro sb->s_root = d_make_root(inode); 121848fde701SAl Viro if (!sb->s_root) { 121939279cc3SChris Mason err = -ENOMEM; 122039279cc3SChris Mason goto fail_close; 12212e635a27SChris Mason } 122258176a96SJosef Bacik 122390a887c9SDan Magenheimer cleancache_init_fs(sb); 12241751e8a6SLinus Torvalds sb->s_flags |= SB_ACTIVE; 12252e635a27SChris Mason return 0; 12262e635a27SChris Mason 122739279cc3SChris Mason fail_close: 12286bccf3abSJeff Mahoney close_ctree(fs_info); 1229d5719762SChris Mason return err; 1230d5719762SChris Mason } 1231d5719762SChris Mason 12326bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1233d5719762SChris Mason { 1234d5719762SChris Mason struct btrfs_trans_handle *trans; 1235815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1236815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1237df2ce34cSChris Mason 1238bc074524SJeff Mahoney trace_btrfs_sync_fs(fs_info, wait); 12391abe9b8aSliubo 1240d561c025SChris Mason if (!wait) { 1241815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1242df2ce34cSChris Mason return 0; 1243d561c025SChris Mason } 1244771ed689SChris Mason 12456374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 1246771ed689SChris Mason 1247d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 124860376ce4SJosef Bacik if (IS_ERR(trans)) { 1249354aa0fbSMiao Xie /* no transaction, don't bother */ 12506b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 12516b5fe46dSDavid Sterba /* 12526b5fe46dSDavid Sterba * Exit unless we have some pending changes 12536b5fe46dSDavid Sterba * that need to go through commit 12546b5fe46dSDavid Sterba */ 12556b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1256bd7de2c9SJosef Bacik return 0; 1257a53f4f8eSQu Wenruo /* 1258a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1259a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1260a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1261a53f4f8eSQu Wenruo * next commit after thawing. 1262a53f4f8eSQu Wenruo */ 1263a7e3c5f2SRakesh Pandit if (sb_start_write_trylock(sb)) 1264a7e3c5f2SRakesh Pandit sb_end_write(sb); 1265a53f4f8eSQu Wenruo else 1266a53f4f8eSQu Wenruo return 0; 12676b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 126860376ce4SJosef Bacik } 126998bd5c54SDavid Sterba if (IS_ERR(trans)) 127098bd5c54SDavid Sterba return PTR_ERR(trans); 12716b5fe46dSDavid Sterba } 12723a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 1273d5719762SChris Mason } 1274d5719762SChris Mason 127534c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1276a9572a15SEric Paris { 1277815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 12780f628c63SDavid Sterba const char *compress_type; 1279a9572a15SEric Paris 12803cdde224SJeff Mahoney if (btrfs_test_opt(info, DEGRADED)) 1281a9572a15SEric Paris seq_puts(seq, ",degraded"); 12823cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) 1283a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 12843cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 1285a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 12863cdde224SJeff Mahoney if (btrfs_test_opt(info, NOBARRIER)) 1287a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 128895ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1289c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1290a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1291a9572a15SEric Paris num_online_cpus() + 2, 8)) 1292f7b885beSAnand Jain seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); 12933cdde224SJeff Mahoney if (btrfs_test_opt(info, COMPRESS)) { 12940f628c63SDavid Sterba compress_type = btrfs_compress_type2str(info->compress_type); 12953cdde224SJeff Mahoney if (btrfs_test_opt(info, FORCE_COMPRESS)) 1296200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1297200da64eSTsutomu Itoh else 1298200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1299f51d2b59SDavid Sterba if (info->compress_level) 1300fa4d885aSAdam Borowski seq_printf(seq, ":%d", info->compress_level); 1301200da64eSTsutomu Itoh } 13023cdde224SJeff Mahoney if (btrfs_test_opt(info, NOSSD)) 1303c289811cSChris Mason seq_puts(seq, ",nossd"); 13043cdde224SJeff Mahoney if (btrfs_test_opt(info, SSD_SPREAD)) 1305451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 13063cdde224SJeff Mahoney else if (btrfs_test_opt(info, SSD)) 1307a9572a15SEric Paris seq_puts(seq, ",ssd"); 13083cdde224SJeff Mahoney if (btrfs_test_opt(info, NOTREELOG)) 13096b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 13103cdde224SJeff Mahoney if (btrfs_test_opt(info, NOLOGREPLAY)) 131196da0919SQu Wenruo seq_puts(seq, ",nologreplay"); 13123cdde224SJeff Mahoney if (btrfs_test_opt(info, FLUSHONCOMMIT)) 13136b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 13143cdde224SJeff Mahoney if (btrfs_test_opt(info, DISCARD)) 131520a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 13161751e8a6SLinus Torvalds if (!(info->sb->s_flags & SB_POSIXACL)) 1317a9572a15SEric Paris seq_puts(seq, ",noacl"); 13183cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) 1319200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 13203cdde224SJeff Mahoney else if (btrfs_test_opt(info, FREE_SPACE_TREE)) 132170f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 132273bc1876SJosef Bacik else 13238965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 13243cdde224SJeff Mahoney if (btrfs_test_opt(info, RESCAN_UUID_TREE)) 1325f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 13263cdde224SJeff Mahoney if (btrfs_test_opt(info, CLEAR_CACHE)) 1327200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 13283cdde224SJeff Mahoney if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) 1329200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 13303cdde224SJeff Mahoney if (btrfs_test_opt(info, ENOSPC_DEBUG)) 13310942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 13323cdde224SJeff Mahoney if (btrfs_test_opt(info, AUTO_DEFRAG)) 13330942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 13343cdde224SJeff Mahoney if (btrfs_test_opt(info, INODE_MAP_CACHE)) 13350942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 13363cdde224SJeff Mahoney if (btrfs_test_opt(info, SKIP_BALANCE)) 13379555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 13388507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 13393cdde224SJeff Mahoney if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 13408507d216SWang Shilong seq_puts(seq, ",check_int_data"); 13413cdde224SJeff Mahoney else if (btrfs_test_opt(info, CHECK_INTEGRITY)) 13428507d216SWang Shilong seq_puts(seq, ",check_int"); 13438507d216SWang Shilong if (info->check_integrity_print_mask) 13448507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 13458507d216SWang Shilong info->check_integrity_print_mask); 13468507d216SWang Shilong #endif 13478507d216SWang Shilong if (info->metadata_ratio) 1348764cb8b4SAnand Jain seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); 13493cdde224SJeff Mahoney if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) 13508c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 13518b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 1352d3740608SAnand Jain seq_printf(seq, ",commit=%u", info->commit_interval); 1353d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 13543cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_DATA)) 1355d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 13563cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_METADATA)) 1357d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1358d0bd4560SJosef Bacik #endif 1359fb592373SJosef Bacik if (btrfs_test_opt(info, REF_VERIFY)) 1360fb592373SJosef Bacik seq_puts(seq, ",ref_verify"); 1361c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1362c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 1363c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 1364c8d3fe02SOmar Sandoval seq_dentry(seq, dentry, " \t\n\\"); 1365a9572a15SEric Paris return 0; 1366a9572a15SEric Paris } 1367a9572a15SEric Paris 1368a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 13692e635a27SChris Mason { 1370815745cfSAl Viro struct btrfs_fs_info *p = data; 1371815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 13724b82d6e4SYan 1373815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 13744b82d6e4SYan } 13754b82d6e4SYan 1376450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1377450ba0eaSJosef Bacik { 13786de1d09dSAl Viro int err = set_anon_super(s, data); 13796de1d09dSAl Viro if (!err) 1380450ba0eaSJosef Bacik s->s_fs_info = data; 13816de1d09dSAl Viro return err; 1382450ba0eaSJosef Bacik } 1383450ba0eaSJosef Bacik 1384830c4adbSJosef Bacik /* 1385f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1386f9d9ef62SDavid Sterba */ 1387f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1388f9d9ef62SDavid Sterba { 1389f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1390f9d9ef62SDavid Sterba return 1; 1391f9d9ef62SDavid Sterba return 0; 1392f9d9ef62SDavid Sterba } 1393f9d9ef62SDavid Sterba 1394bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 13955bedc48aSDavid Sterba const char *device_name, struct vfsmount *mnt) 1396830c4adbSJosef Bacik { 1397830c4adbSJosef Bacik struct dentry *root; 1398fa330659SOmar Sandoval int ret; 1399830c4adbSJosef Bacik 140005dbe683SOmar Sandoval if (!subvol_name) { 140105dbe683SOmar Sandoval if (!subvol_objectid) { 140205dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 140305dbe683SOmar Sandoval &subvol_objectid); 140405dbe683SOmar Sandoval if (ret) { 140505dbe683SOmar Sandoval root = ERR_PTR(ret); 140605dbe683SOmar Sandoval goto out; 140705dbe683SOmar Sandoval } 140805dbe683SOmar Sandoval } 140905dbe683SOmar Sandoval subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), 141005dbe683SOmar Sandoval subvol_objectid); 141105dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 141205dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 141305dbe683SOmar Sandoval subvol_name = NULL; 141405dbe683SOmar Sandoval goto out; 141505dbe683SOmar Sandoval } 141605dbe683SOmar Sandoval 141705dbe683SOmar Sandoval } 141805dbe683SOmar Sandoval 1419ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1420fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1421fa330659SOmar Sandoval mnt = NULL; 1422830c4adbSJosef Bacik 1423bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1424ea441d11SAl Viro struct super_block *s = root->d_sb; 1425ab8d0fc4SJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(s); 1426bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1427bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1428bb289b7bSOmar Sandoval 1429bb289b7bSOmar Sandoval ret = 0; 1430bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1431ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "'%s' is not a valid subvolume", 1432bb289b7bSOmar Sandoval subvol_name); 1433bb289b7bSOmar Sandoval ret = -EINVAL; 1434bb289b7bSOmar Sandoval } 1435bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 143605dbe683SOmar Sandoval /* 143705dbe683SOmar Sandoval * This will also catch a race condition where a 143805dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 143905dbe683SOmar Sandoval * another subvolume is renamed over the old location. 144005dbe683SOmar Sandoval */ 1441ab8d0fc4SJeff Mahoney btrfs_err(fs_info, 1442ab8d0fc4SJeff Mahoney "subvol '%s' does not match subvolid %llu", 1443bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1444bb289b7bSOmar Sandoval ret = -EINVAL; 1445bb289b7bSOmar Sandoval } 1446bb289b7bSOmar Sandoval if (ret) { 1447ea441d11SAl Viro dput(root); 1448bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1449ea441d11SAl Viro deactivate_locked_super(s); 1450bb289b7bSOmar Sandoval } 1451f9d9ef62SDavid Sterba } 1452f9d9ef62SDavid Sterba 1453fa330659SOmar Sandoval out: 1454fa330659SOmar Sandoval mntput(mnt); 1455fa330659SOmar Sandoval kfree(subvol_name); 1456830c4adbSJosef Bacik return root; 1457830c4adbSJosef Bacik } 1458450ba0eaSJosef Bacik 1459f667aef6SQu Wenruo static int parse_security_options(char *orig_opts, 1460f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1461f667aef6SQu Wenruo { 1462f667aef6SQu Wenruo char *secdata = NULL; 1463f667aef6SQu Wenruo int ret = 0; 1464f667aef6SQu Wenruo 1465f667aef6SQu Wenruo secdata = alloc_secdata(); 1466f667aef6SQu Wenruo if (!secdata) 1467f667aef6SQu Wenruo return -ENOMEM; 1468f667aef6SQu Wenruo ret = security_sb_copy_data(orig_opts, secdata); 1469f667aef6SQu Wenruo if (ret) { 1470f667aef6SQu Wenruo free_secdata(secdata); 1471f667aef6SQu Wenruo return ret; 1472f667aef6SQu Wenruo } 1473f667aef6SQu Wenruo ret = security_sb_parse_opts_str(secdata, sec_opts); 1474f667aef6SQu Wenruo free_secdata(secdata); 1475f667aef6SQu Wenruo return ret; 1476f667aef6SQu Wenruo } 1477f667aef6SQu Wenruo 1478f667aef6SQu Wenruo static int setup_security_options(struct btrfs_fs_info *fs_info, 1479f667aef6SQu Wenruo struct super_block *sb, 1480f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1481f667aef6SQu Wenruo { 1482f667aef6SQu Wenruo int ret = 0; 1483f667aef6SQu Wenruo 1484f667aef6SQu Wenruo /* 1485f667aef6SQu Wenruo * Call security_sb_set_mnt_opts() to check whether new sec_opts 1486f667aef6SQu Wenruo * is valid. 1487f667aef6SQu Wenruo */ 1488f667aef6SQu Wenruo ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); 1489f667aef6SQu Wenruo if (ret) 1490f667aef6SQu Wenruo return ret; 1491f667aef6SQu Wenruo 1492a43bb39bSQu Wenruo #ifdef CONFIG_SECURITY 1493f667aef6SQu Wenruo if (!fs_info->security_opts.num_mnt_opts) { 1494f667aef6SQu Wenruo /* first time security setup, copy sec_opts to fs_info */ 1495f667aef6SQu Wenruo memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); 1496f667aef6SQu Wenruo } else { 1497f667aef6SQu Wenruo /* 1498180e4d47SLuis de Bethencourt * Since SELinux (the only one supporting security_mnt_opts) 1499180e4d47SLuis de Bethencourt * does NOT support changing context during remount/mount of 1500180e4d47SLuis de Bethencourt * the same sb, this must be the same or part of the same 1501180e4d47SLuis de Bethencourt * security options, just free it. 1502f667aef6SQu Wenruo */ 1503f667aef6SQu Wenruo security_free_mnt_opts(sec_opts); 1504f667aef6SQu Wenruo } 1505a43bb39bSQu Wenruo #endif 1506f667aef6SQu Wenruo return ret; 1507f667aef6SQu Wenruo } 1508f667aef6SQu Wenruo 1509312c89fbSMisono, Tomohiro /* 1510312c89fbSMisono, Tomohiro * Find a superblock for the given device / mount point. 1511312c89fbSMisono, Tomohiro * 1512312c89fbSMisono, Tomohiro * Note: This is based on mount_bdev from fs/super.c with a few additions 1513312c89fbSMisono, Tomohiro * for multiple device setup. Make sure to keep it in sync. 1514312c89fbSMisono, Tomohiro */ 151572fa39f5SMisono, Tomohiro static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 151672fa39f5SMisono, Tomohiro int flags, const char *device_name, void *data) 151772fa39f5SMisono, Tomohiro { 151872fa39f5SMisono, Tomohiro struct block_device *bdev = NULL; 151972fa39f5SMisono, Tomohiro struct super_block *s; 152072fa39f5SMisono, Tomohiro struct btrfs_fs_devices *fs_devices = NULL; 152172fa39f5SMisono, Tomohiro struct btrfs_fs_info *fs_info = NULL; 152272fa39f5SMisono, Tomohiro struct security_mnt_opts new_sec_opts; 152372fa39f5SMisono, Tomohiro fmode_t mode = FMODE_READ; 152472fa39f5SMisono, Tomohiro int error = 0; 152572fa39f5SMisono, Tomohiro 152672fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY)) 152772fa39f5SMisono, Tomohiro mode |= FMODE_WRITE; 152872fa39f5SMisono, Tomohiro 1529*5139cff5SDavid Sterba mutex_lock(&uuid_mutex); 153072fa39f5SMisono, Tomohiro error = btrfs_parse_early_options(data, mode, fs_type, 153172fa39f5SMisono, Tomohiro &fs_devices); 1532*5139cff5SDavid Sterba mutex_unlock(&uuid_mutex); 153372fa39f5SMisono, Tomohiro if (error) { 153472fa39f5SMisono, Tomohiro return ERR_PTR(error); 153572fa39f5SMisono, Tomohiro } 153672fa39f5SMisono, Tomohiro 153772fa39f5SMisono, Tomohiro security_init_mnt_opts(&new_sec_opts); 153872fa39f5SMisono, Tomohiro if (data) { 153972fa39f5SMisono, Tomohiro error = parse_security_options(data, &new_sec_opts); 154072fa39f5SMisono, Tomohiro if (error) 154172fa39f5SMisono, Tomohiro return ERR_PTR(error); 154272fa39f5SMisono, Tomohiro } 154372fa39f5SMisono, Tomohiro 1544899f9307SDavid Sterba mutex_lock(&uuid_mutex); 154572fa39f5SMisono, Tomohiro error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1546899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 154772fa39f5SMisono, Tomohiro if (error) 154872fa39f5SMisono, Tomohiro goto error_sec_opts; 154972fa39f5SMisono, Tomohiro 155072fa39f5SMisono, Tomohiro /* 155172fa39f5SMisono, Tomohiro * Setup a dummy root and fs_info for test/set super. This is because 155272fa39f5SMisono, Tomohiro * we don't actually fill this stuff out until open_ctree, but we need 155372fa39f5SMisono, Tomohiro * it for searching for existing supers, so this lets us do that and 155472fa39f5SMisono, Tomohiro * then open_ctree will properly initialize everything later. 155572fa39f5SMisono, Tomohiro */ 1556a8fd1f71SJeff Mahoney fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 155772fa39f5SMisono, Tomohiro if (!fs_info) { 155872fa39f5SMisono, Tomohiro error = -ENOMEM; 155972fa39f5SMisono, Tomohiro goto error_sec_opts; 156072fa39f5SMisono, Tomohiro } 156172fa39f5SMisono, Tomohiro 156272fa39f5SMisono, Tomohiro fs_info->fs_devices = fs_devices; 156372fa39f5SMisono, Tomohiro 156472fa39f5SMisono, Tomohiro fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 156572fa39f5SMisono, Tomohiro fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 156672fa39f5SMisono, Tomohiro security_init_mnt_opts(&fs_info->security_opts); 156772fa39f5SMisono, Tomohiro if (!fs_info->super_copy || !fs_info->super_for_commit) { 156872fa39f5SMisono, Tomohiro error = -ENOMEM; 156972fa39f5SMisono, Tomohiro goto error_fs_info; 157072fa39f5SMisono, Tomohiro } 157172fa39f5SMisono, Tomohiro 1572f5194e34SDavid Sterba mutex_lock(&uuid_mutex); 157372fa39f5SMisono, Tomohiro error = btrfs_open_devices(fs_devices, mode, fs_type); 1574f5194e34SDavid Sterba mutex_unlock(&uuid_mutex); 157572fa39f5SMisono, Tomohiro if (error) 157672fa39f5SMisono, Tomohiro goto error_fs_info; 157772fa39f5SMisono, Tomohiro 157872fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 157972fa39f5SMisono, Tomohiro error = -EACCES; 158072fa39f5SMisono, Tomohiro goto error_close_devices; 158172fa39f5SMisono, Tomohiro } 158272fa39f5SMisono, Tomohiro 158372fa39f5SMisono, Tomohiro bdev = fs_devices->latest_bdev; 158472fa39f5SMisono, Tomohiro s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 158572fa39f5SMisono, Tomohiro fs_info); 158672fa39f5SMisono, Tomohiro if (IS_ERR(s)) { 158772fa39f5SMisono, Tomohiro error = PTR_ERR(s); 158872fa39f5SMisono, Tomohiro goto error_close_devices; 158972fa39f5SMisono, Tomohiro } 159072fa39f5SMisono, Tomohiro 159172fa39f5SMisono, Tomohiro if (s->s_root) { 159272fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 159372fa39f5SMisono, Tomohiro free_fs_info(fs_info); 159472fa39f5SMisono, Tomohiro if ((flags ^ s->s_flags) & SB_RDONLY) 159572fa39f5SMisono, Tomohiro error = -EBUSY; 159672fa39f5SMisono, Tomohiro } else { 159772fa39f5SMisono, Tomohiro snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 159872fa39f5SMisono, Tomohiro btrfs_sb(s)->bdev_holder = fs_type; 159972fa39f5SMisono, Tomohiro error = btrfs_fill_super(s, fs_devices, data); 160072fa39f5SMisono, Tomohiro } 160172fa39f5SMisono, Tomohiro if (error) { 160272fa39f5SMisono, Tomohiro deactivate_locked_super(s); 160372fa39f5SMisono, Tomohiro goto error_sec_opts; 160472fa39f5SMisono, Tomohiro } 160572fa39f5SMisono, Tomohiro 160672fa39f5SMisono, Tomohiro fs_info = btrfs_sb(s); 160772fa39f5SMisono, Tomohiro error = setup_security_options(fs_info, s, &new_sec_opts); 160872fa39f5SMisono, Tomohiro if (error) { 160972fa39f5SMisono, Tomohiro deactivate_locked_super(s); 161072fa39f5SMisono, Tomohiro goto error_sec_opts; 161172fa39f5SMisono, Tomohiro } 161272fa39f5SMisono, Tomohiro 161372fa39f5SMisono, Tomohiro return dget(s->s_root); 161472fa39f5SMisono, Tomohiro 161572fa39f5SMisono, Tomohiro error_close_devices: 161672fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 161772fa39f5SMisono, Tomohiro error_fs_info: 161872fa39f5SMisono, Tomohiro free_fs_info(fs_info); 161972fa39f5SMisono, Tomohiro error_sec_opts: 162072fa39f5SMisono, Tomohiro security_free_mnt_opts(&new_sec_opts); 162172fa39f5SMisono, Tomohiro return ERR_PTR(error); 162272fa39f5SMisono, Tomohiro } 1623312c89fbSMisono, Tomohiro 1624edf24abeSChristoph Hellwig /* 1625312c89fbSMisono, Tomohiro * Mount function which is called by VFS layer. 1626edf24abeSChristoph Hellwig * 1627312c89fbSMisono, Tomohiro * In order to allow mounting a subvolume directly, btrfs uses mount_subtree() 1628312c89fbSMisono, Tomohiro * which needs vfsmount* of device's root (/). This means device's root has to 1629312c89fbSMisono, Tomohiro * be mounted internally in any case. 1630312c89fbSMisono, Tomohiro * 1631312c89fbSMisono, Tomohiro * Operation flow: 1632312c89fbSMisono, Tomohiro * 1. Parse subvol id related options for later use in mount_subvol(). 1633312c89fbSMisono, Tomohiro * 1634312c89fbSMisono, Tomohiro * 2. Mount device's root (/) by calling vfs_kern_mount(). 1635312c89fbSMisono, Tomohiro * 1636312c89fbSMisono, Tomohiro * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the 1637312c89fbSMisono, Tomohiro * first place. In order to avoid calling btrfs_mount() again, we use 1638312c89fbSMisono, Tomohiro * different file_system_type which is not registered to VFS by 1639312c89fbSMisono, Tomohiro * register_filesystem() (btrfs_root_fs_type). As a result, 1640312c89fbSMisono, Tomohiro * btrfs_mount_root() is called. The return value will be used by 1641312c89fbSMisono, Tomohiro * mount_subtree() in mount_subvol(). 1642312c89fbSMisono, Tomohiro * 1643312c89fbSMisono, Tomohiro * 3. Call mount_subvol() to get the dentry of subvolume. Since there is 1644312c89fbSMisono, Tomohiro * "btrfs subvolume set-default", mount_subvol() is called always. 1645edf24abeSChristoph Hellwig */ 1646061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1647306e16ceSDavid Sterba const char *device_name, void *data) 16484b82d6e4SYan { 1649312c89fbSMisono, Tomohiro struct vfsmount *mnt_root; 1650312c89fbSMisono, Tomohiro struct dentry *root; 165197288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 165273f73415SJosef Bacik char *subvol_name = NULL; 165373f73415SJosef Bacik u64 subvol_objectid = 0; 16544b82d6e4SYan int error = 0; 16554b82d6e4SYan 16561751e8a6SLinus Torvalds if (!(flags & SB_RDONLY)) 165797288f2cSChristoph Hellwig mode |= FMODE_WRITE; 165897288f2cSChristoph Hellwig 165993b9bcdfSGu Jinxiang error = btrfs_parse_subvol_options(data, &subvol_name, 166093b9bcdfSGu Jinxiang &subvol_objectid); 1661f23c8af8SIlya Dryomov if (error) { 1662f23c8af8SIlya Dryomov kfree(subvol_name); 1663061dbc6bSAl Viro return ERR_PTR(error); 1664f23c8af8SIlya Dryomov } 1665edf24abeSChristoph Hellwig 1666312c89fbSMisono, Tomohiro /* mount device's root (/) */ 1667312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); 1668312c89fbSMisono, Tomohiro if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { 1669312c89fbSMisono, Tomohiro if (flags & SB_RDONLY) { 1670312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1671312c89fbSMisono, Tomohiro flags & ~SB_RDONLY, device_name, data); 16724b82d6e4SYan } else { 1673312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1674312c89fbSMisono, Tomohiro flags | SB_RDONLY, device_name, data); 1675312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1676312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1677312c89fbSMisono, Tomohiro goto out; 1678f667aef6SQu Wenruo } 1679f667aef6SQu Wenruo 1680312c89fbSMisono, Tomohiro down_write(&mnt_root->mnt_sb->s_umount); 1681312c89fbSMisono, Tomohiro error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); 1682312c89fbSMisono, Tomohiro up_write(&mnt_root->mnt_sb->s_umount); 1683312c89fbSMisono, Tomohiro if (error < 0) { 1684312c89fbSMisono, Tomohiro root = ERR_PTR(error); 1685312c89fbSMisono, Tomohiro mntput(mnt_root); 1686312c89fbSMisono, Tomohiro goto out; 1687312c89fbSMisono, Tomohiro } 1688312c89fbSMisono, Tomohiro } 1689312c89fbSMisono, Tomohiro } 1690312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1691312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1692312c89fbSMisono, Tomohiro goto out; 1693f667aef6SQu Wenruo } 16944b82d6e4SYan 1695312c89fbSMisono, Tomohiro /* mount_subvol() will free subvol_name and mnt_root */ 16965bedc48aSDavid Sterba root = mount_subvol(subvol_name, subvol_objectid, device_name, mnt_root); 16974b82d6e4SYan 1698312c89fbSMisono, Tomohiro out: 1699312c89fbSMisono, Tomohiro return root; 17004b82d6e4SYan } 17012e635a27SChris Mason 17020d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 1703f7b885beSAnand Jain u32 new_pool_size, u32 old_pool_size) 17040d2450abSSergei Trofimovich { 17050d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 17060d2450abSSergei Trofimovich return; 17070d2450abSSergei Trofimovich 17080d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 17090d2450abSSergei Trofimovich 1710efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 17110d2450abSSergei Trofimovich old_pool_size, new_pool_size); 17120d2450abSSergei Trofimovich 17135cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1714afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1715a8c93d4eSQu Wenruo btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1716e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1717fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1718fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1719fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1720fccb5d86SQu Wenruo new_pool_size); 1721fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1722fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 17235b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1724736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 17250339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1726ff023aacSStefan Behrens new_pool_size); 17270d2450abSSergei Trofimovich } 17280d2450abSSergei Trofimovich 1729f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1730dc81cdc5SMiao Xie { 1731dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1732f42a34b2SMiao Xie } 1733dc81cdc5SMiao Xie 1734f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1735f42a34b2SMiao Xie unsigned long old_opts, int flags) 1736f42a34b2SMiao Xie { 1737dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1738dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 17391751e8a6SLinus Torvalds (flags & SB_RDONLY))) { 1740dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1741dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1742dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 17431751e8a6SLinus Torvalds if (flags & SB_RDONLY) 1744dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1745dc81cdc5SMiao Xie } 1746dc81cdc5SMiao Xie } 1747dc81cdc5SMiao Xie 1748dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1749dc81cdc5SMiao Xie unsigned long old_opts) 1750dc81cdc5SMiao Xie { 1751dc81cdc5SMiao Xie /* 1752180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1753180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1754dc81cdc5SMiao Xie */ 1755dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1756bc98a42cSDavid Howells (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { 1757dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1758dc81cdc5SMiao Xie } 1759dc81cdc5SMiao Xie 1760dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1761dc81cdc5SMiao Xie } 1762dc81cdc5SMiao Xie 1763c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1764c146afadSYan Zheng { 1765815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1766815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 176749b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 176849b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 176949b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 177049b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 1771f7b885beSAnand Jain u32 old_thread_pool_size = fs_info->thread_pool_size; 1772d612ac59SAnand Jain u32 old_metadata_ratio = fs_info->metadata_ratio; 1773c146afadSYan Zheng int ret; 1774c146afadSYan Zheng 177502b9984dSTheodore Ts'o sync_filesystem(sb); 1776f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1777dc81cdc5SMiao Xie 1778f667aef6SQu Wenruo if (data) { 1779f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 1780f667aef6SQu Wenruo 1781f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1782f667aef6SQu Wenruo ret = parse_security_options(data, &new_sec_opts); 1783f667aef6SQu Wenruo if (ret) 1784f667aef6SQu Wenruo goto restore; 1785f667aef6SQu Wenruo ret = setup_security_options(fs_info, sb, 1786f667aef6SQu Wenruo &new_sec_opts); 1787f667aef6SQu Wenruo if (ret) { 1788f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1789f667aef6SQu Wenruo goto restore; 1790f667aef6SQu Wenruo } 1791f667aef6SQu Wenruo } 1792f667aef6SQu Wenruo 17932ff7e61eSJeff Mahoney ret = btrfs_parse_options(fs_info, data, *flags); 1794891f41cbSChengguang Xu if (ret) 179549b25e05SJeff Mahoney goto restore; 1796b288052eSChris Mason 1797f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 17980d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 17990d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 18000d2450abSSergei Trofimovich 18011751e8a6SLinus Torvalds if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1802dc81cdc5SMiao Xie goto out; 1803c146afadSYan Zheng 18041751e8a6SLinus Torvalds if (*flags & SB_RDONLY) { 18058dabb742SStefan Behrens /* 18068dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 18078dabb742SStefan Behrens * the filesystem is busy. 18088dabb742SStefan Behrens */ 180921c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 1810361c093dSStefan Behrens 1811361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1812361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1813361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1814361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1815361c093dSStefan Behrens 18161751e8a6SLinus Torvalds sb->s_flags |= SB_RDONLY; 1817c146afadSYan Zheng 1818e44163e1SJeff Mahoney /* 18191751e8a6SLinus Torvalds * Setting SB_RDONLY will put the cleaner thread to 1820e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1821e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1822e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1823e44163e1SJeff Mahoney * unless we clean them up here. 1824e44163e1SJeff Mahoney */ 1825e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1826e44163e1SJeff Mahoney 18278dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 18288dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1829061594efSMiao Xie btrfs_pause_balance(fs_info); 18308dabb742SStefan Behrens 18316bccf3abSJeff Mahoney ret = btrfs_commit_super(fs_info); 183249b25e05SJeff Mahoney if (ret) 183349b25e05SJeff Mahoney goto restore; 1834c146afadSYan Zheng } else { 18350b246afaSJeff Mahoney if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 18366ef3de9cSDavid Sterba btrfs_err(fs_info, 1837efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 18386ef3de9cSDavid Sterba ret = -EINVAL; 18396ef3de9cSDavid Sterba goto restore; 18406ef3de9cSDavid Sterba } 18418a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 184249b25e05SJeff Mahoney ret = -EACCES; 184349b25e05SJeff Mahoney goto restore; 18448a3db184SSergei Trofimovich } 18452b82032cSYan Zheng 18466528b99dSAnand Jain if (!btrfs_check_rw_degradable(fs_info, NULL)) { 1847efe120a0SFrank Holton btrfs_warn(fs_info, 1848efe120a0SFrank Holton "too many missing devices, writeable remount is not allowed"); 1849292fd7fcSStefan Behrens ret = -EACCES; 1850292fd7fcSStefan Behrens goto restore; 1851292fd7fcSStefan Behrens } 1852292fd7fcSStefan Behrens 18538a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 185449b25e05SJeff Mahoney ret = -EINVAL; 185549b25e05SJeff Mahoney goto restore; 18568a3db184SSergei Trofimovich } 1857c146afadSYan Zheng 1858815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 185949b25e05SJeff Mahoney if (ret) 186049b25e05SJeff Mahoney goto restore; 1861c146afadSYan Zheng 1862d68fc57bSYan, Zheng /* recover relocation */ 18635f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 1864d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 18655f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 186649b25e05SJeff Mahoney if (ret) 186749b25e05SJeff Mahoney goto restore; 1868c146afadSYan Zheng 18692b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 18702b6ba629SIlya Dryomov if (ret) 18712b6ba629SIlya Dryomov goto restore; 18722b6ba629SIlya Dryomov 18738dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 18748dabb742SStefan Behrens if (ret) { 1875efe120a0SFrank Holton btrfs_warn(fs_info, "failed to resume dev_replace"); 18768dabb742SStefan Behrens goto restore; 18778dabb742SStefan Behrens } 187894aebfb2SJosef Bacik 18796c6b5a39SAleksa Sarai btrfs_qgroup_rescan_resume(fs_info); 18806c6b5a39SAleksa Sarai 188194aebfb2SJosef Bacik if (!fs_info->uuid_root) { 1882efe120a0SFrank Holton btrfs_info(fs_info, "creating UUID tree"); 188394aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 188494aebfb2SJosef Bacik if (ret) { 18855d163e0eSJeff Mahoney btrfs_warn(fs_info, 18865d163e0eSJeff Mahoney "failed to create the UUID tree %d", 18875d163e0eSJeff Mahoney ret); 188894aebfb2SJosef Bacik goto restore; 188994aebfb2SJosef Bacik } 189094aebfb2SJosef Bacik } 18911751e8a6SLinus Torvalds sb->s_flags &= ~SB_RDONLY; 189290c711abSZygo Blaxell 1893afcdd129SJosef Bacik set_bit(BTRFS_FS_OPEN, &fs_info->flags); 1894c146afadSYan Zheng } 1895dc81cdc5SMiao Xie out: 18962c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 1897dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1898c146afadSYan Zheng return 0; 189949b25e05SJeff Mahoney 190049b25e05SJeff Mahoney restore: 19011751e8a6SLinus Torvalds /* We've hit an error - don't reset SB_RDONLY */ 1902bc98a42cSDavid Howells if (sb_rdonly(sb)) 19031751e8a6SLinus Torvalds old_flags |= SB_RDONLY; 190449b25e05SJeff Mahoney sb->s_flags = old_flags; 190549b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 190649b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 190749b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 19080d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 19090d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 191049b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1911dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 191249b25e05SJeff Mahoney return ret; 1913c146afadSYan Zheng } 1914c146afadSYan Zheng 1915bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1916bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1917bcd53741SArne Jansen const void *dev_info2) 1918bcd53741SArne Jansen { 1919bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1920bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1921bcd53741SArne Jansen return -1; 1922bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1923bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1924bcd53741SArne Jansen return 1; 1925bcd53741SArne Jansen else 1926bcd53741SArne Jansen return 0; 1927bcd53741SArne Jansen } 1928bcd53741SArne Jansen 1929bcd53741SArne Jansen /* 1930bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1931bcd53741SArne Jansen * is stored.(Descending Sort) 1932bcd53741SArne Jansen */ 1933bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1934bcd53741SArne Jansen struct btrfs_device_info *devices, 1935bcd53741SArne Jansen size_t nr_devices) 1936bcd53741SArne Jansen { 1937bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1938bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1939bcd53741SArne Jansen } 1940bcd53741SArne Jansen 19416d07bcecSMiao Xie /* 19426d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 19436d07bcecSMiao Xie * file data. 19446d07bcecSMiao Xie */ 19456bccf3abSJeff Mahoney static int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, 19466bccf3abSJeff Mahoney u64 *free_bytes) 19476d07bcecSMiao Xie { 19486d07bcecSMiao Xie struct btrfs_device_info *devices_info; 19496d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 19506d07bcecSMiao Xie struct btrfs_device *device; 19516d07bcecSMiao Xie u64 skip_space; 19526d07bcecSMiao Xie u64 type; 19536d07bcecSMiao Xie u64 avail_space; 19546d07bcecSMiao Xie u64 min_stripe_size; 195539fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 19566d07bcecSMiao Xie int i = 0, nr_devices; 19576d07bcecSMiao Xie 19587e33fd99SJosef Bacik /* 195901327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 19607e33fd99SJosef Bacik * enough for our purposes. 19617e33fd99SJosef Bacik */ 1962b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 19637e33fd99SJosef Bacik if (!nr_devices) { 19647e33fd99SJosef Bacik smp_mb(); 19657e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 19667e33fd99SJosef Bacik ASSERT(nr_devices); 19677e33fd99SJosef Bacik if (!nr_devices) { 19687e33fd99SJosef Bacik *free_bytes = 0; 19697e33fd99SJosef Bacik return 0; 19707e33fd99SJosef Bacik } 19717e33fd99SJosef Bacik } 19726d07bcecSMiao Xie 1973d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 19746a44517dSDavid Sterba GFP_KERNEL); 19756d07bcecSMiao Xie if (!devices_info) 19766d07bcecSMiao Xie return -ENOMEM; 19776d07bcecSMiao Xie 197801327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 19791b86826dSJeff Mahoney type = btrfs_data_alloc_profile(fs_info); 198039fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 19816d07bcecSMiao Xie min_stripes = 2; 198239fb26c3SMiao Xie num_stripes = nr_devices; 198339fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 19846d07bcecSMiao Xie min_stripes = 2; 198539fb26c3SMiao Xie num_stripes = 2; 198639fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 19876d07bcecSMiao Xie min_stripes = 4; 198839fb26c3SMiao Xie num_stripes = 4; 198939fb26c3SMiao Xie } 19906d07bcecSMiao Xie 19916d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 19926d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 19936d07bcecSMiao Xie else 19946d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 19956d07bcecSMiao Xie 19967e33fd99SJosef Bacik rcu_read_lock(); 19977e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 1998e12c9621SAnand Jain if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 1999e12c9621SAnand Jain &device->dev_state) || 2000401e29c1SAnand Jain !device->bdev || 2001401e29c1SAnand Jain test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) 20026d07bcecSMiao Xie continue; 20036d07bcecSMiao Xie 20047e33fd99SJosef Bacik if (i >= nr_devices) 20057e33fd99SJosef Bacik break; 20067e33fd99SJosef Bacik 20076d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 20086d07bcecSMiao Xie 20096d07bcecSMiao Xie /* align with stripe_len */ 2010f8c269d7SDavid Sterba avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); 20116d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 20126d07bcecSMiao Xie 20136d07bcecSMiao Xie /* 201401327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 20156d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 20166d07bcecSMiao Xie * allocation. 20176d07bcecSMiao Xie */ 2018ee22184bSByongho Lee skip_space = SZ_1M; 20196d07bcecSMiao Xie 20206d07bcecSMiao Xie /* 20216d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 20226d07bcecSMiao Xie * it from the total. 20236d07bcecSMiao Xie */ 20246d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 20256d07bcecSMiao Xie avail_space -= skip_space; 20266d07bcecSMiao Xie else 20276d07bcecSMiao Xie avail_space = 0; 20286d07bcecSMiao Xie 20296d07bcecSMiao Xie if (avail_space < min_stripe_size) 20306d07bcecSMiao Xie continue; 20316d07bcecSMiao Xie 20326d07bcecSMiao Xie devices_info[i].dev = device; 20336d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 20346d07bcecSMiao Xie 20356d07bcecSMiao Xie i++; 20366d07bcecSMiao Xie } 20377e33fd99SJosef Bacik rcu_read_unlock(); 20386d07bcecSMiao Xie 20396d07bcecSMiao Xie nr_devices = i; 20406d07bcecSMiao Xie 20416d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 20426d07bcecSMiao Xie 20436d07bcecSMiao Xie i = nr_devices - 1; 20446d07bcecSMiao Xie avail_space = 0; 20456d07bcecSMiao Xie while (nr_devices >= min_stripes) { 204639fb26c3SMiao Xie if (num_stripes > nr_devices) 204739fb26c3SMiao Xie num_stripes = nr_devices; 204839fb26c3SMiao Xie 20496d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 20506d07bcecSMiao Xie int j; 20516d07bcecSMiao Xie u64 alloc_size; 20526d07bcecSMiao Xie 205339fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 20546d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 205539fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 20566d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 20576d07bcecSMiao Xie } 20586d07bcecSMiao Xie i--; 20596d07bcecSMiao Xie nr_devices--; 20606d07bcecSMiao Xie } 20616d07bcecSMiao Xie 20626d07bcecSMiao Xie kfree(devices_info); 20636d07bcecSMiao Xie *free_bytes = avail_space; 20646d07bcecSMiao Xie return 0; 20656d07bcecSMiao Xie } 20666d07bcecSMiao Xie 2067ba7b6e62SDavid Sterba /* 2068ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2069ba7b6e62SDavid Sterba * 2070ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2071ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2072ba7b6e62SDavid Sterba * 2073ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 20740d0c71b3SDavid Sterba * algorithm that respects the device sizes and order of allocations. This is 20750d0c71b3SDavid Sterba * a close approximation of the actual use but there are other factors that may 20760d0c71b3SDavid Sterba * change the result (like a new metadata chunk). 2077ba7b6e62SDavid Sterba * 2078ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2079ba7b6e62SDavid Sterba */ 20808fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 20818fd17795SChris Mason { 2082815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2083815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2084815745cfSAl Viro struct list_head *head = &fs_info->space_info; 2085bd4d1088SJosef Bacik struct btrfs_space_info *found; 2086bd4d1088SJosef Bacik u64 total_used = 0; 20876d07bcecSMiao Xie u64 total_free_data = 0; 2088ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2089db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 2090815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 2091ba7b6e62SDavid Sterba unsigned factor = 1; 2092ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 20936d07bcecSMiao Xie int ret; 2094ca8a51b3SDavid Sterba u64 thresh = 0; 2095ae02d1bdSLuis de Bethencourt int mixed = 0; 20968fd17795SChris Mason 2097bd4d1088SJosef Bacik rcu_read_lock(); 209889a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 20996d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2100ba7b6e62SDavid Sterba int i; 2101ba7b6e62SDavid Sterba 21026d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 21036d07bcecSMiao Xie total_free_data -= 21046d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2105ba7b6e62SDavid Sterba 2106ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 2107ba7b6e62SDavid Sterba if (!list_empty(&found->block_groups[i])) { 2108ba7b6e62SDavid Sterba switch (i) { 2109ba7b6e62SDavid Sterba case BTRFS_RAID_DUP: 2110ba7b6e62SDavid Sterba case BTRFS_RAID_RAID1: 2111ba7b6e62SDavid Sterba case BTRFS_RAID_RAID10: 2112ba7b6e62SDavid Sterba factor = 2; 2113ba7b6e62SDavid Sterba } 2114ba7b6e62SDavid Sterba } 2115ba7b6e62SDavid Sterba } 21166d07bcecSMiao Xie } 2117ae02d1bdSLuis de Bethencourt 2118ae02d1bdSLuis de Bethencourt /* 2119ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2120ae02d1bdSLuis de Bethencourt */ 2121ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2122ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2123ae02d1bdSLuis de Bethencourt mixed = 1; 2124ae02d1bdSLuis de Bethencourt else 2125ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2126ae02d1bdSLuis de Bethencourt found->disk_used; 2127ae02d1bdSLuis de Bethencourt } 21286d07bcecSMiao Xie 2129b742bb82SYan, Zheng total_used += found->disk_used; 213089a55897SJosef Bacik } 2131ba7b6e62SDavid Sterba 2132bd4d1088SJosef Bacik rcu_read_unlock(); 2133bd4d1088SJosef Bacik 2134ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2135ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2136ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2137ba7b6e62SDavid Sterba 2138ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2139ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 214041b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 214141b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2142ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 214341b34accSLuis de Bethencourt else 214441b34accSLuis de Bethencourt buf->f_bfree = 0; 2145ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2146ba7b6e62SDavid Sterba 21470d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 21486bccf3abSJeff Mahoney ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); 21497e33fd99SJosef Bacik if (ret) 21506d07bcecSMiao Xie return ret; 2151ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 21526d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2153d397712bSChris Mason 2154ca8a51b3SDavid Sterba /* 2155ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2156ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2157ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2158ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2159ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2160ca8a51b3SDavid Sterba * 2161ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2162ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2163ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2164ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2165ca8a51b3SDavid Sterba * way around. 2166ca8a51b3SDavid Sterba */ 2167d4417e22SNikolay Borisov thresh = SZ_4M; 2168ca8a51b3SDavid Sterba 2169ae02d1bdSLuis de Bethencourt if (!mixed && total_free_meta - thresh < block_rsv->size) 2170ca8a51b3SDavid Sterba buf->f_bavail = 0; 2171ca8a51b3SDavid Sterba 2172ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2173ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2174ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2175ba7b6e62SDavid Sterba 21769d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 21779d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 21789d03632eSDavid Woodhouse on a big-endian or little-endian host */ 21799d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 21809d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 218132d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 21822b0143b5SDavid Howells buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; 21832b0143b5SDavid Howells buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; 218432d48fa1SDavid Woodhouse 21858fd17795SChris Mason return 0; 21868fd17795SChris Mason } 2187b5133862SChris Mason 2188aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2189aea52e19SAl Viro { 2190815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2191aea52e19SAl Viro kill_anon_super(sb); 2192aea52e19SAl Viro free_fs_info(fs_info); 2193aea52e19SAl Viro } 2194aea52e19SAl Viro 21952e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 21962e635a27SChris Mason .owner = THIS_MODULE, 21972e635a27SChris Mason .name = "btrfs", 2198061dbc6bSAl Viro .mount = btrfs_mount, 2199aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2200f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 22012e635a27SChris Mason }; 220272fa39f5SMisono, Tomohiro 220372fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type = { 220472fa39f5SMisono, Tomohiro .owner = THIS_MODULE, 220572fa39f5SMisono, Tomohiro .name = "btrfs", 220672fa39f5SMisono, Tomohiro .mount = btrfs_mount_root, 220772fa39f5SMisono, Tomohiro .kill_sb = btrfs_kill_super, 220872fa39f5SMisono, Tomohiro .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 220972fa39f5SMisono, Tomohiro }; 221072fa39f5SMisono, Tomohiro 22117f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2212a9218f6bSChris Mason 2213d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2214d8620958STom Van Braeckel { 2215d8620958STom Van Braeckel /* 2216d8620958STom Van Braeckel * The control file's private_data is used to hold the 2217d8620958STom Van Braeckel * transaction when it is started and is used to keep 2218d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2219d8620958STom Van Braeckel */ 2220d8620958STom Van Braeckel file->private_data = NULL; 2221d8620958STom Van Braeckel return 0; 2222d8620958STom Van Braeckel } 2223d8620958STom Van Braeckel 2224d352ac68SChris Mason /* 2225d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 2226d352ac68SChris Mason */ 22278a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 22288a4b83ccSChris Mason unsigned long arg) 22298a4b83ccSChris Mason { 22308a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 22318a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 2232c071fcfdSChris Mason int ret = -ENOTTY; 22338a4b83ccSChris Mason 2234e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2235e441d54dSChris Mason return -EPERM; 2236e441d54dSChris Mason 2237dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2238dae7b665SLi Zefan if (IS_ERR(vol)) 2239dae7b665SLi Zefan return PTR_ERR(vol); 2240c071fcfdSChris Mason 22418a4b83ccSChris Mason switch (cmd) { 22428a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 2243899f9307SDavid Sterba mutex_lock(&uuid_mutex); 224497288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 2245312c89fbSMisono, Tomohiro &btrfs_root_fs_type, &fs_devices); 2246899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 22478a4b83ccSChris Mason break; 224802db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 2249899f9307SDavid Sterba mutex_lock(&uuid_mutex); 225002db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 2251312c89fbSMisono, Tomohiro &btrfs_root_fs_type, &fs_devices); 2252899f9307SDavid Sterba if (ret) { 2253899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 225402db0844SJosef Bacik break; 2255899f9307SDavid Sterba } 225602db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 2257899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 225802db0844SJosef Bacik break; 2259c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2260d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2261c5868f83SDavid Sterba break; 22628a4b83ccSChris Mason } 2263dae7b665SLi Zefan 22648a4b83ccSChris Mason kfree(vol); 2265f819d837SLinda Knippers return ret; 22668a4b83ccSChris Mason } 22678a4b83ccSChris Mason 22680176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2269ed0dab6bSYan { 2270354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 22710b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 22720b246afaSJeff Mahoney struct btrfs_root *root = fs_info->tree_root; 2273354aa0fbSMiao Xie 2274fac03c8dSDavid Sterba set_bit(BTRFS_FS_FROZEN, &fs_info->flags); 22759e7cc91aSWang Xiaoguang /* 22769e7cc91aSWang Xiaoguang * We don't need a barrier here, we'll wait for any transaction that 22779e7cc91aSWang Xiaoguang * could be in progress on other threads (and do delayed iputs that 22789e7cc91aSWang Xiaoguang * we want to avoid on a frozen filesystem), or do the commit 22799e7cc91aSWang Xiaoguang * ourselves. 22809e7cc91aSWang Xiaoguang */ 2281d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2282354aa0fbSMiao Xie if (IS_ERR(trans)) { 2283354aa0fbSMiao Xie /* no transaction, don't bother */ 2284354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 22850176260fSLinus Torvalds return 0; 2286354aa0fbSMiao Xie return PTR_ERR(trans); 2287354aa0fbSMiao Xie } 22883a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 2289ed0dab6bSYan } 2290ed0dab6bSYan 22919e7cc91aSWang Xiaoguang static int btrfs_unfreeze(struct super_block *sb) 22929e7cc91aSWang Xiaoguang { 2293fac03c8dSDavid Sterba struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2294fac03c8dSDavid Sterba 2295fac03c8dSDavid Sterba clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); 22969e7cc91aSWang Xiaoguang return 0; 22979e7cc91aSWang Xiaoguang } 22989e7cc91aSWang Xiaoguang 22999c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 23009c5085c1SJosef Bacik { 23019c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 23029c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 23039c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 23049c5085c1SJosef Bacik struct list_head *head; 23059c5085c1SJosef Bacik struct rcu_string *name; 23069c5085c1SJosef Bacik 230788c14590SDavid Sterba /* 230888c14590SDavid Sterba * Lightweight locking of the devices. We should not need 230988c14590SDavid Sterba * device_list_mutex here as we only read the device data and the list 231088c14590SDavid Sterba * is protected by RCU. Even if a device is deleted during the list 231188c14590SDavid Sterba * traversals, we'll get valid data, the freeing callback will wait at 231288c14590SDavid Sterba * least until until the rcu_read_unlock. 231388c14590SDavid Sterba */ 231488c14590SDavid Sterba rcu_read_lock(); 23159c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 23169c5085c1SJosef Bacik while (cur_devices) { 23179c5085c1SJosef Bacik head = &cur_devices->devices; 231888c14590SDavid Sterba list_for_each_entry_rcu(dev, head, dev_list) { 2319e6e674bdSAnand Jain if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) 2320aa9ddcd4SJosef Bacik continue; 23210aeb8a6eSAnand Jain if (!dev->name) 23220aeb8a6eSAnand Jain continue; 23239c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 23249c5085c1SJosef Bacik first_dev = dev; 23259c5085c1SJosef Bacik } 23269c5085c1SJosef Bacik cur_devices = cur_devices->seed; 23279c5085c1SJosef Bacik } 23289c5085c1SJosef Bacik 23299c5085c1SJosef Bacik if (first_dev) { 23309c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 23319c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 23329c5085c1SJosef Bacik } else { 23339c5085c1SJosef Bacik WARN_ON(1); 23349c5085c1SJosef Bacik } 233588c14590SDavid Sterba rcu_read_unlock(); 23369c5085c1SJosef Bacik return 0; 23379c5085c1SJosef Bacik } 23389c5085c1SJosef Bacik 2339b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 234076dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2341bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2342e20d96d6SChris Mason .put_super = btrfs_put_super, 2343d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2344a9572a15SEric Paris .show_options = btrfs_show_options, 23459c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 23464730a4bcSChris Mason .write_inode = btrfs_write_inode, 23472c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 23482c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 23498fd17795SChris Mason .statfs = btrfs_statfs, 2350c146afadSYan Zheng .remount_fs = btrfs_remount, 23510176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 23529e7cc91aSWang Xiaoguang .unfreeze_fs = btrfs_unfreeze, 2353e20d96d6SChris Mason }; 2354a9218f6bSChris Mason 2355a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2356d8620958STom Van Braeckel .open = btrfs_control_open, 2357a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 2358a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 2359a9218f6bSChris Mason .owner = THIS_MODULE, 23606038f373SArnd Bergmann .llseek = noop_llseek, 2361a9218f6bSChris Mason }; 2362a9218f6bSChris Mason 2363a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2364578454ffSKay Sievers .minor = BTRFS_MINOR, 2365a9218f6bSChris Mason .name = "btrfs-control", 2366a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2367a9218f6bSChris Mason }; 2368a9218f6bSChris Mason 2369578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2370578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2371578454ffSKay Sievers 2372f5c29bd9SLiu Bo static int __init btrfs_interface_init(void) 2373a9218f6bSChris Mason { 2374a9218f6bSChris Mason return misc_register(&btrfs_misc); 2375a9218f6bSChris Mason } 2376a9218f6bSChris Mason 2377e67c718bSDavid Sterba static __cold void btrfs_interface_exit(void) 2378a9218f6bSChris Mason { 2379f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2380a9218f6bSChris Mason } 2381a9218f6bSChris Mason 2382f5c29bd9SLiu Bo static void __init btrfs_print_mod_info(void) 238385965600SDavid Sterba { 2384edf57cbfSBart Van Assche static const char options[] = "" 238585965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 238685965600SDavid Sterba ", debug=on" 238785965600SDavid Sterba #endif 238879556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 238979556c3dSStefan Behrens ", assert=on" 239079556c3dSStefan Behrens #endif 239185965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 239285965600SDavid Sterba ", integrity-checker=on" 239385965600SDavid Sterba #endif 2394fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2395fb592373SJosef Bacik ", ref-verify=on" 2396fb592373SJosef Bacik #endif 2397edf57cbfSBart Van Assche ; 2398edf57cbfSBart Van Assche pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); 239985965600SDavid Sterba } 240085965600SDavid Sterba 24012e635a27SChris Mason static int __init init_btrfs_fs(void) 24022e635a27SChris Mason { 24032c90e5d6SChris Mason int err; 240458176a96SJosef Bacik 240563541927SFilipe David Borba Manana btrfs_props_init(); 240663541927SFilipe David Borba Manana 240758176a96SJosef Bacik err = btrfs_init_sysfs(); 240858176a96SJosef Bacik if (err) 24099678c543SNikolay Borisov return err; 241058176a96SJosef Bacik 2411143bede5SJeff Mahoney btrfs_init_compress(); 2412d1310b2eSChris Mason 2413261507a0SLi Zefan err = btrfs_init_cachep(); 2414261507a0SLi Zefan if (err) 2415261507a0SLi Zefan goto free_compress; 2416261507a0SLi Zefan 2417d1310b2eSChris Mason err = extent_io_init(); 24182f4cbe64SWyatt Banks if (err) 24192f4cbe64SWyatt Banks goto free_cachep; 24202f4cbe64SWyatt Banks 2421d1310b2eSChris Mason err = extent_map_init(); 2422d1310b2eSChris Mason if (err) 2423d1310b2eSChris Mason goto free_extent_io; 2424d1310b2eSChris Mason 24256352b91dSMiao Xie err = ordered_data_init(); 24262f4cbe64SWyatt Banks if (err) 24272f4cbe64SWyatt Banks goto free_extent_map; 2428c8b97818SChris Mason 24296352b91dSMiao Xie err = btrfs_delayed_inode_init(); 24306352b91dSMiao Xie if (err) 24316352b91dSMiao Xie goto free_ordered_data; 24326352b91dSMiao Xie 24339247f317SMiao Xie err = btrfs_auto_defrag_init(); 243416cdcec7SMiao Xie if (err) 243516cdcec7SMiao Xie goto free_delayed_inode; 243616cdcec7SMiao Xie 243778a6184aSMiao Xie err = btrfs_delayed_ref_init(); 24389247f317SMiao Xie if (err) 24399247f317SMiao Xie goto free_auto_defrag; 24409247f317SMiao Xie 2441b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2442b9e9a6cbSWang Shilong if (err) 2443af13b492SDavid Sterba goto free_delayed_ref; 2444b9e9a6cbSWang Shilong 244597eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 244678a6184aSMiao Xie if (err) 2447af13b492SDavid Sterba goto free_prelim_ref; 244878a6184aSMiao Xie 244997eb6b69SDavid Sterba err = btrfs_interface_init(); 245097eb6b69SDavid Sterba if (err) 245197eb6b69SDavid Sterba goto free_end_io_wq; 245297eb6b69SDavid Sterba 2453e565d4b9SJan Schmidt btrfs_init_lockdep(); 2454e565d4b9SJan Schmidt 24558ae1af3cSAnand Jain btrfs_print_mod_info(); 2456dc11dd5dSJosef Bacik 2457dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2458dc11dd5dSJosef Bacik if (err) 2459dc11dd5dSJosef Bacik goto unregister_ioctl; 2460dc11dd5dSJosef Bacik 2461dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2462dc11dd5dSJosef Bacik if (err) 2463dc11dd5dSJosef Bacik goto unregister_ioctl; 246474255aa0SJosef Bacik 24652f4cbe64SWyatt Banks return 0; 24662f4cbe64SWyatt Banks 2467a9218f6bSChris Mason unregister_ioctl: 2468a9218f6bSChris Mason btrfs_interface_exit(); 246997eb6b69SDavid Sterba free_end_io_wq: 247097eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2471b9e9a6cbSWang Shilong free_prelim_ref: 2472b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 247378a6184aSMiao Xie free_delayed_ref: 247478a6184aSMiao Xie btrfs_delayed_ref_exit(); 24759247f317SMiao Xie free_auto_defrag: 24769247f317SMiao Xie btrfs_auto_defrag_exit(); 247716cdcec7SMiao Xie free_delayed_inode: 247816cdcec7SMiao Xie btrfs_delayed_inode_exit(); 24796352b91dSMiao Xie free_ordered_data: 24806352b91dSMiao Xie ordered_data_exit(); 24812f4cbe64SWyatt Banks free_extent_map: 24822f4cbe64SWyatt Banks extent_map_exit(); 2483d1310b2eSChris Mason free_extent_io: 2484d1310b2eSChris Mason extent_io_exit(); 24852f4cbe64SWyatt Banks free_cachep: 24862f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2487261507a0SLi Zefan free_compress: 2488261507a0SLi Zefan btrfs_exit_compress(); 24892f4cbe64SWyatt Banks btrfs_exit_sysfs(); 24909678c543SNikolay Borisov 24912c90e5d6SChris Mason return err; 24922e635a27SChris Mason } 24932e635a27SChris Mason 24942e635a27SChris Mason static void __exit exit_btrfs_fs(void) 24952e635a27SChris Mason { 249639279cc3SChris Mason btrfs_destroy_cachep(); 249778a6184aSMiao Xie btrfs_delayed_ref_exit(); 24989247f317SMiao Xie btrfs_auto_defrag_exit(); 249916cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2500b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 25016352b91dSMiao Xie ordered_data_exit(); 2502a52d9a80SChris Mason extent_map_exit(); 2503d1310b2eSChris Mason extent_io_exit(); 2504a9218f6bSChris Mason btrfs_interface_exit(); 25055ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 25062e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 250758176a96SJosef Bacik btrfs_exit_sysfs(); 25088a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2509261507a0SLi Zefan btrfs_exit_compress(); 25102e635a27SChris Mason } 25112e635a27SChris Mason 251260efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 25132e635a27SChris Mason module_exit(exit_btrfs_fs) 25142e635a27SChris Mason 25152e635a27SChris Mason MODULE_LICENSE("GPL"); 2516