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 9652042d8eSAndrea Gelmini * invokes the appropriate 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 15452042d8eSAndrea Gelmini * completes. The next time when the filesystem is mounted writable 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 /* 468fa59f27cSAnand Jain * These are parsed by btrfs_parse_subvol_options or 469fa59f27cSAnand Jain * btrfs_parse_device_options and can be ignored here. 470edf24abeSChristoph Hellwig */ 47195e05289SChris Mason break; 472b6cda9bcSChris Mason case Opt_nodatasum: 4733cdde224SJeff Mahoney btrfs_set_and_info(info, NODATASUM, 47407802534SQu Wenruo "setting nodatasum"); 475be20aa9dSChris Mason break; 476d399167dSQu Wenruo case Opt_datasum: 4773cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) { 4783cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 4790b246afaSJeff Mahoney btrfs_info(info, 4805d163e0eSJeff Mahoney "setting datasum, datacow enabled"); 481d399167dSQu Wenruo else 4820b246afaSJeff Mahoney btrfs_info(info, "setting datasum"); 48307802534SQu Wenruo } 484d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 485d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 486d399167dSQu Wenruo break; 487be20aa9dSChris Mason case Opt_nodatacow: 4883cdde224SJeff Mahoney if (!btrfs_test_opt(info, NODATACOW)) { 4893cdde224SJeff Mahoney if (!btrfs_test_opt(info, COMPRESS) || 4903cdde224SJeff Mahoney !btrfs_test_opt(info, FORCE_COMPRESS)) { 4910b246afaSJeff Mahoney btrfs_info(info, 492efe120a0SFrank Holton "setting nodatacow, compression disabled"); 493bedb2ccaSAndrei Popa } else { 4940b246afaSJeff Mahoney btrfs_info(info, "setting nodatacow"); 495bedb2ccaSAndrei Popa } 49607802534SQu Wenruo } 497bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 498bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 499be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 500be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 501b6cda9bcSChris Mason break; 502a258af7aSQu Wenruo case Opt_datacow: 5033cdde224SJeff Mahoney btrfs_clear_and_info(info, NODATACOW, 50407802534SQu Wenruo "setting datacow"); 505a258af7aSQu Wenruo break; 506a555f810SChris Mason case Opt_compress_force: 507261507a0SLi Zefan case Opt_compress_force_type: 508261507a0SLi Zefan compress_force = true; 5091c697d4aSEric Sandeen /* Fallthrough */ 510261507a0SLi Zefan case Opt_compress: 511261507a0SLi Zefan case Opt_compress_type: 5123cdde224SJeff Mahoney saved_compress_type = btrfs_test_opt(info, 5133cdde224SJeff Mahoney COMPRESS) ? 514b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 515b7c47bbbSTsutomu Itoh saved_compress_force = 5163cdde224SJeff Mahoney btrfs_test_opt(info, FORCE_COMPRESS); 517261507a0SLi Zefan if (token == Opt_compress || 518261507a0SLi Zefan token == Opt_compress_force || 519a7164fa4SDavid Sterba strncmp(args[0].from, "zlib", 4) == 0) { 520261507a0SLi Zefan compress_type = "zlib"; 521eae8d825SQu Wenruo 522261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 523eae8d825SQu Wenruo info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; 524eae8d825SQu Wenruo /* 525eae8d825SQu Wenruo * args[0] contains uninitialized data since 526eae8d825SQu Wenruo * for these tokens we don't expect any 527eae8d825SQu Wenruo * parameter. 528eae8d825SQu Wenruo */ 529eae8d825SQu Wenruo if (token != Opt_compress && 530eae8d825SQu Wenruo token != Opt_compress_force) 531f51d2b59SDavid Sterba info->compress_level = 532d0ab62ceSDennis Zhou btrfs_compress_str2level( 533d0ab62ceSDennis Zhou BTRFS_COMPRESS_ZLIB, 534d0ab62ceSDennis Zhou args[0].from + 4); 535063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 536bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 537bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 538b7c47bbbSTsutomu Itoh no_compress = 0; 539a7164fa4SDavid Sterba } else if (strncmp(args[0].from, "lzo", 3) == 0) { 540a6fa6faeSLi Zefan compress_type = "lzo"; 541a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 542063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 543bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 544bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 5452b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 546b7c47bbbSTsutomu Itoh no_compress = 0; 5473f93aef5SDennis Zhou } else if (strncmp(args[0].from, "zstd", 4) == 0) { 5485c1aab1dSNick Terrell compress_type = "zstd"; 5495c1aab1dSNick Terrell info->compress_type = BTRFS_COMPRESS_ZSTD; 5503f93aef5SDennis Zhou info->compress_level = 5513f93aef5SDennis Zhou btrfs_compress_str2level( 5523f93aef5SDennis Zhou BTRFS_COMPRESS_ZSTD, 5533f93aef5SDennis Zhou args[0].from + 4); 5545c1aab1dSNick Terrell btrfs_set_opt(info->mount_opt, COMPRESS); 5555c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATACOW); 5565c1aab1dSNick Terrell btrfs_clear_opt(info->mount_opt, NODATASUM); 5575c1aab1dSNick Terrell btrfs_set_fs_incompat(info, COMPRESS_ZSTD); 5585c1aab1dSNick Terrell no_compress = 0; 559063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 560063849eaSArnd Hannemann compress_type = "no"; 561063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 562063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 563063849eaSArnd Hannemann compress_force = false; 564b7c47bbbSTsutomu Itoh no_compress++; 565261507a0SLi Zefan } else { 566261507a0SLi Zefan ret = -EINVAL; 567261507a0SLi Zefan goto out; 568261507a0SLi Zefan } 569261507a0SLi Zefan 570261507a0SLi Zefan if (compress_force) { 571b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 572143f3636SDavid Sterba } else { 5734027e0f4SWang Shilong /* 5744027e0f4SWang Shilong * If we remount from compress-force=xxx to 5754027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 5764027e0f4SWang Shilong * flag, otherwise, there is no way for users 5774027e0f4SWang Shilong * to disable forcible compression separately. 5784027e0f4SWang Shilong */ 5794027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 580a7e252afSMiao Xie } 5813cdde224SJeff Mahoney if ((btrfs_test_opt(info, COMPRESS) && 582b7c47bbbSTsutomu Itoh (info->compress_type != saved_compress_type || 583b7c47bbbSTsutomu Itoh compress_force != saved_compress_force)) || 5843cdde224SJeff Mahoney (!btrfs_test_opt(info, COMPRESS) && 585b7c47bbbSTsutomu Itoh no_compress == 1)) { 586f51d2b59SDavid Sterba btrfs_info(info, "%s %s compression, level %d", 587b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 588f51d2b59SDavid Sterba compress_type, info->compress_level); 589b7c47bbbSTsutomu Itoh } 590b7c47bbbSTsutomu Itoh compress_force = false; 591a555f810SChris Mason break; 592e18e4809SChris Mason case Opt_ssd: 5933cdde224SJeff Mahoney btrfs_set_and_info(info, SSD, 594583b7231SHans van Kranenburg "enabling ssd optimizations"); 595951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 596e18e4809SChris Mason break; 597451d7585SChris Mason case Opt_ssd_spread: 598583b7231SHans van Kranenburg btrfs_set_and_info(info, SSD, 599583b7231SHans van Kranenburg "enabling ssd optimizations"); 6003cdde224SJeff Mahoney btrfs_set_and_info(info, SSD_SPREAD, 601583b7231SHans van Kranenburg "using spread ssd allocation scheme"); 602951e7966SAdam Borowski btrfs_clear_opt(info->mount_opt, NOSSD); 603451d7585SChris Mason break; 6043b30c22fSChris Mason case Opt_nossd: 605583b7231SHans van Kranenburg btrfs_set_opt(info->mount_opt, NOSSD); 606583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD, 607583b7231SHans van Kranenburg "not using ssd optimizations"); 60862b8e077SHoward McLauchlan /* Fallthrough */ 60962b8e077SHoward McLauchlan case Opt_nossd_spread: 610583b7231SHans van Kranenburg btrfs_clear_and_info(info, SSD_SPREAD, 611583b7231SHans van Kranenburg "not using spread ssd allocation scheme"); 6123b30c22fSChris Mason break; 613842bef58SQu Wenruo case Opt_barrier: 6143cdde224SJeff Mahoney btrfs_clear_and_info(info, NOBARRIER, 61507802534SQu Wenruo "turning on barriers"); 616842bef58SQu Wenruo break; 61721ad10cfSChris Mason case Opt_nobarrier: 6183cdde224SJeff Mahoney btrfs_set_and_info(info, NOBARRIER, 61907802534SQu Wenruo "turning off barriers"); 62021ad10cfSChris Mason break; 6214543df7eSChris Mason case Opt_thread_pool: 6222c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6232c334e87SWang Shilong if (ret) { 6242c334e87SWang Shilong goto out; 625f7b885beSAnand Jain } else if (intarg == 0) { 6262c334e87SWang Shilong ret = -EINVAL; 6272c334e87SWang Shilong goto out; 6282c334e87SWang Shilong } 629f7b885beSAnand Jain info->thread_pool_size = intarg; 6304543df7eSChris Mason break; 6316f568d35SChris Mason case Opt_max_inline: 632edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 6336f568d35SChris Mason if (num) { 63491748467SAkinobu Mita info->max_inline = memparse(num, NULL); 6356f568d35SChris Mason kfree(num); 6366f568d35SChris Mason 63715ada040SChris Mason if (info->max_inline) { 638feb5f965SMitch Harder info->max_inline = min_t(u64, 63915ada040SChris Mason info->max_inline, 6400b246afaSJeff Mahoney info->sectorsize); 64115ada040SChris Mason } 6420b246afaSJeff Mahoney btrfs_info(info, "max_inline at %llu", 643c1c9ff7cSGeert Uytterhoeven info->max_inline); 6442c334e87SWang Shilong } else { 6452c334e87SWang Shilong ret = -ENOMEM; 6462c334e87SWang Shilong goto out; 6476f568d35SChris Mason } 6486f568d35SChris Mason break; 6498f662a76SChris Mason case Opt_alloc_start: 6500d0c71b3SDavid Sterba btrfs_info(info, 6510d0c71b3SDavid Sterba "option alloc_start is obsolete, ignored"); 6528f662a76SChris Mason break; 653bd0330adSQu Wenruo case Opt_acl: 65445ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 6551751e8a6SLinus Torvalds info->sb->s_flags |= SB_POSIXACL; 656bd0330adSQu Wenruo break; 65745ff35d6SGuangliang Zhao #else 6580b246afaSJeff Mahoney btrfs_err(info, "support for ACL not compiled in!"); 65945ff35d6SGuangliang Zhao ret = -EINVAL; 66045ff35d6SGuangliang Zhao goto out; 66145ff35d6SGuangliang Zhao #endif 66233268eafSJosef Bacik case Opt_noacl: 6631751e8a6SLinus Torvalds info->sb->s_flags &= ~SB_POSIXACL; 66433268eafSJosef Bacik break; 6653a5e1404SSage Weil case Opt_notreelog: 6663cdde224SJeff Mahoney btrfs_set_and_info(info, NOTREELOG, 66707802534SQu Wenruo "disabling tree log"); 6683a5e1404SSage Weil break; 669a88998f2SQu Wenruo case Opt_treelog: 6703cdde224SJeff Mahoney btrfs_clear_and_info(info, NOTREELOG, 67107802534SQu Wenruo "enabling tree log"); 672a88998f2SQu Wenruo break; 673fed8f166SQu Wenruo case Opt_norecovery: 67496da0919SQu Wenruo case Opt_nologreplay: 6753cdde224SJeff Mahoney btrfs_set_and_info(info, NOLOGREPLAY, 67696da0919SQu Wenruo "disabling log replay at mount time"); 67796da0919SQu Wenruo break; 678dccae999SSage Weil case Opt_flushoncommit: 6793cdde224SJeff Mahoney btrfs_set_and_info(info, FLUSHONCOMMIT, 68007802534SQu Wenruo "turning on flush-on-commit"); 681dccae999SSage Weil break; 6822c9ee856SQu Wenruo case Opt_noflushoncommit: 6833cdde224SJeff Mahoney btrfs_clear_and_info(info, FLUSHONCOMMIT, 68407802534SQu Wenruo "turning off flush-on-commit"); 6852c9ee856SQu Wenruo break; 68697e728d4SJosef Bacik case Opt_ratio: 6872c334e87SWang Shilong ret = match_int(&args[0], &intarg); 688764cb8b4SAnand Jain if (ret) 6892c334e87SWang Shilong goto out; 69097e728d4SJosef Bacik info->metadata_ratio = intarg; 691764cb8b4SAnand Jain btrfs_info(info, "metadata ratio %u", 69297e728d4SJosef Bacik info->metadata_ratio); 69397e728d4SJosef Bacik break; 694e244a0aeSChristoph Hellwig case Opt_discard: 6953cdde224SJeff Mahoney btrfs_set_and_info(info, DISCARD, 69607802534SQu Wenruo "turning on discard"); 697e244a0aeSChristoph Hellwig break; 698e07a2adeSQu Wenruo case Opt_nodiscard: 6993cdde224SJeff Mahoney btrfs_clear_and_info(info, DISCARD, 70007802534SQu Wenruo "turning off discard"); 701e07a2adeSQu Wenruo break; 7020af3d00bSJosef Bacik case Opt_space_cache: 70370f6d82eSOmar Sandoval case Opt_space_cache_version: 70470f6d82eSOmar Sandoval if (token == Opt_space_cache || 70570f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 7060b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 70770f6d82eSOmar Sandoval FREE_SPACE_TREE); 7083cdde224SJeff Mahoney btrfs_set_and_info(info, SPACE_CACHE, 70907802534SQu Wenruo "enabling disk space caching"); 71070f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 7110b246afaSJeff Mahoney btrfs_clear_opt(info->mount_opt, 71270f6d82eSOmar Sandoval SPACE_CACHE); 7130b246afaSJeff Mahoney btrfs_set_and_info(info, FREE_SPACE_TREE, 71470f6d82eSOmar Sandoval "enabling free space tree"); 71570f6d82eSOmar Sandoval } else { 71670f6d82eSOmar Sandoval ret = -EINVAL; 71770f6d82eSOmar Sandoval goto out; 71870f6d82eSOmar Sandoval } 7190de90876SJosef Bacik break; 720f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 721f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 722f420ee1eSStefan Behrens break; 72373bc1876SJosef Bacik case Opt_no_space_cache: 7243cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) { 7250b246afaSJeff Mahoney btrfs_clear_and_info(info, SPACE_CACHE, 72607802534SQu Wenruo "disabling disk space caching"); 72770f6d82eSOmar Sandoval } 7283cdde224SJeff Mahoney if (btrfs_test_opt(info, FREE_SPACE_TREE)) { 7290b246afaSJeff Mahoney btrfs_clear_and_info(info, FREE_SPACE_TREE, 73070f6d82eSOmar Sandoval "disabling free space tree"); 73170f6d82eSOmar Sandoval } 73273bc1876SJosef Bacik break; 7334b9465cbSChris Mason case Opt_inode_cache: 7347e1876acSDavid Sterba btrfs_set_pending_and_info(info, INODE_MAP_CACHE, 73507802534SQu Wenruo "enabling inode map caching"); 7363818aea2SQu Wenruo break; 7373818aea2SQu Wenruo case Opt_noinode_cache: 7387e1876acSDavid Sterba btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, 73907802534SQu Wenruo "disabling inode map caching"); 7404b9465cbSChris Mason break; 74188c2ba3bSJosef Bacik case Opt_clear_cache: 7423cdde224SJeff Mahoney btrfs_set_and_info(info, CLEAR_CACHE, 74307802534SQu Wenruo "force clearing of disk cache"); 7440af3d00bSJosef Bacik break; 7454260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 7464260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 7474260f7c7SSage Weil break; 74891435650SChris Mason case Opt_enospc_debug: 74991435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 75091435650SChris Mason break; 75153036293SQu Wenruo case Opt_noenospc_debug: 75253036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 75353036293SQu Wenruo break; 7544cb5300bSChris Mason case Opt_defrag: 7553cdde224SJeff Mahoney btrfs_set_and_info(info, AUTO_DEFRAG, 75607802534SQu Wenruo "enabling auto defrag"); 7574cb5300bSChris Mason break; 758fc0ca9afSQu Wenruo case Opt_nodefrag: 7593cdde224SJeff Mahoney btrfs_clear_and_info(info, AUTO_DEFRAG, 76007802534SQu Wenruo "disabling auto defrag"); 761fc0ca9afSQu Wenruo break; 762af31f5e5SChris Mason case Opt_recovery: 7630b246afaSJeff Mahoney btrfs_warn(info, 7648dcddfa0SQu Wenruo "'recovery' is deprecated, use 'usebackuproot' instead"); 765acd43e3cSBart Van Assche /* fall through */ 7668dcddfa0SQu Wenruo case Opt_usebackuproot: 7670b246afaSJeff Mahoney btrfs_info(info, 7688dcddfa0SQu Wenruo "trying to use backup root at mount time"); 7698dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 770af31f5e5SChris Mason break; 7719555c6c1SIlya Dryomov case Opt_skip_balance: 7729555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 7739555c6c1SIlya Dryomov break; 77421adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 77521adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 7760b246afaSJeff Mahoney btrfs_info(info, 777efe120a0SFrank Holton "enabling check integrity including extent data"); 77821adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 77921adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 78021adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 78121adbd5cSStefan Behrens break; 78221adbd5cSStefan Behrens case Opt_check_integrity: 7830b246afaSJeff Mahoney btrfs_info(info, "enabling check integrity"); 78421adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 78521adbd5cSStefan Behrens break; 78621adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7872c334e87SWang Shilong ret = match_int(&args[0], &intarg); 78802453bdeSAnand Jain if (ret) 7892c334e87SWang Shilong goto out; 79021adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 79102453bdeSAnand Jain btrfs_info(info, "check_integrity_print_mask 0x%x", 79221adbd5cSStefan Behrens info->check_integrity_print_mask); 79321adbd5cSStefan Behrens break; 79421adbd5cSStefan Behrens #else 79521adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 79621adbd5cSStefan Behrens case Opt_check_integrity: 79721adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7980b246afaSJeff Mahoney btrfs_err(info, 799efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 80021adbd5cSStefan Behrens ret = -EINVAL; 80121adbd5cSStefan Behrens goto out; 80221adbd5cSStefan Behrens #endif 8038c342930SJeff Mahoney case Opt_fatal_errors: 8048c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 8058c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 8068c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 8078c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 8088c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 8098c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 8108c342930SJeff Mahoney else { 8118c342930SJeff Mahoney ret = -EINVAL; 8128c342930SJeff Mahoney goto out; 8138c342930SJeff Mahoney } 8148c342930SJeff Mahoney break; 8158b87dc17SDavid Sterba case Opt_commit_interval: 8168b87dc17SDavid Sterba intarg = 0; 8178b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 818d3740608SAnand Jain if (ret) 8198b87dc17SDavid Sterba goto out; 820d3740608SAnand Jain if (intarg == 0) { 821d3740608SAnand Jain btrfs_info(info, 822d3740608SAnand Jain "using default commit interval %us", 823d3740608SAnand Jain BTRFS_DEFAULT_COMMIT_INTERVAL); 824d3740608SAnand Jain intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; 825d3740608SAnand Jain } else if (intarg > 300) { 826d3740608SAnand Jain btrfs_warn(info, "excessive commit interval %d", 8278b87dc17SDavid Sterba intarg); 8288b87dc17SDavid Sterba } 8298b87dc17SDavid Sterba info->commit_interval = intarg; 8308b87dc17SDavid Sterba break; 831d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 832d0bd4560SJosef Bacik case Opt_fragment_all: 8330b246afaSJeff Mahoney btrfs_info(info, "fragmenting all space"); 834d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 835d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 836d0bd4560SJosef Bacik break; 837d0bd4560SJosef Bacik case Opt_fragment_metadata: 8380b246afaSJeff Mahoney btrfs_info(info, "fragmenting metadata"); 839d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 840d0bd4560SJosef Bacik FRAGMENT_METADATA); 841d0bd4560SJosef Bacik break; 842d0bd4560SJosef Bacik case Opt_fragment_data: 8430b246afaSJeff Mahoney btrfs_info(info, "fragmenting data"); 844d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 845d0bd4560SJosef Bacik break; 846d0bd4560SJosef Bacik #endif 847fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 848fb592373SJosef Bacik case Opt_ref_verify: 849fb592373SJosef Bacik btrfs_info(info, "doing ref verification"); 850fb592373SJosef Bacik btrfs_set_opt(info->mount_opt, REF_VERIFY); 851fb592373SJosef Bacik break; 852fb592373SJosef Bacik #endif 853a7a3f7caSSage Weil case Opt_err: 8540b246afaSJeff Mahoney btrfs_info(info, "unrecognized mount option '%s'", p); 855a7a3f7caSSage Weil ret = -EINVAL; 856a7a3f7caSSage Weil goto out; 85795e05289SChris Mason default: 858be20aa9dSChris Mason break; 85995e05289SChris Mason } 86095e05289SChris Mason } 86196da0919SQu Wenruo check: 86296da0919SQu Wenruo /* 86396da0919SQu Wenruo * Extra check for current option against current flag 86496da0919SQu Wenruo */ 8651751e8a6SLinus Torvalds if (btrfs_test_opt(info, NOLOGREPLAY) && !(new_flags & SB_RDONLY)) { 8660b246afaSJeff Mahoney btrfs_err(info, 86796da0919SQu Wenruo "nologreplay must be used with ro mount option"); 86896da0919SQu Wenruo ret = -EINVAL; 86996da0919SQu Wenruo } 870a7a3f7caSSage Weil out: 8710b246afaSJeff Mahoney if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && 8723cdde224SJeff Mahoney !btrfs_test_opt(info, FREE_SPACE_TREE) && 8733cdde224SJeff Mahoney !btrfs_test_opt(info, CLEAR_CACHE)) { 8740b246afaSJeff Mahoney btrfs_err(info, "cannot disable free space tree"); 87570f6d82eSOmar Sandoval ret = -EINVAL; 87670f6d82eSOmar Sandoval 87770f6d82eSOmar Sandoval } 8783cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, SPACE_CACHE)) 8790b246afaSJeff Mahoney btrfs_info(info, "disk space caching is enabled"); 8803cdde224SJeff Mahoney if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) 8810b246afaSJeff Mahoney btrfs_info(info, "using free space tree"); 882a7a3f7caSSage Weil return ret; 883edf24abeSChristoph Hellwig } 884edf24abeSChristoph Hellwig 885edf24abeSChristoph Hellwig /* 886edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 887edf24abeSChristoph Hellwig * 888edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 889edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 890edf24abeSChristoph Hellwig */ 891fa59f27cSAnand Jain static int btrfs_parse_device_options(const char *options, fmode_t flags, 892d64dcbd1SGu Jinxiang void *holder) 893edf24abeSChristoph Hellwig { 894edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 89583c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 89636350e95SGu Jinxiang struct btrfs_device *device = NULL; 897d7407606SMisono, Tomohiro int error = 0; 898d7407606SMisono, Tomohiro 8995139cff5SDavid Sterba lockdep_assert_held(&uuid_mutex); 9005139cff5SDavid Sterba 901d7407606SMisono, Tomohiro if (!options) 902d7407606SMisono, Tomohiro return 0; 903d7407606SMisono, Tomohiro 904d7407606SMisono, Tomohiro /* 905d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because btrfs_parse_options 906d7407606SMisono, Tomohiro * gets called later 907d7407606SMisono, Tomohiro */ 908d7407606SMisono, Tomohiro opts = kstrdup(options, GFP_KERNEL); 909d7407606SMisono, Tomohiro if (!opts) 910d7407606SMisono, Tomohiro return -ENOMEM; 911d7407606SMisono, Tomohiro orig = opts; 912d7407606SMisono, Tomohiro 913d7407606SMisono, Tomohiro while ((p = strsep(&opts, ",")) != NULL) { 914d7407606SMisono, Tomohiro int token; 915d7407606SMisono, Tomohiro 916d7407606SMisono, Tomohiro if (!*p) 917d7407606SMisono, Tomohiro continue; 918d7407606SMisono, Tomohiro 919d7407606SMisono, Tomohiro token = match_token(p, tokens, args); 920d7407606SMisono, Tomohiro if (token == Opt_device) { 921d7407606SMisono, Tomohiro device_name = match_strdup(&args[0]); 922d7407606SMisono, Tomohiro if (!device_name) { 923d7407606SMisono, Tomohiro error = -ENOMEM; 924d7407606SMisono, Tomohiro goto out; 925d7407606SMisono, Tomohiro } 92636350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, flags, 92736350e95SGu Jinxiang holder); 928d7407606SMisono, Tomohiro kfree(device_name); 92936350e95SGu Jinxiang if (IS_ERR(device)) { 93036350e95SGu Jinxiang error = PTR_ERR(device); 931d7407606SMisono, Tomohiro goto out; 932d7407606SMisono, Tomohiro } 933d7407606SMisono, Tomohiro } 93436350e95SGu Jinxiang } 935d7407606SMisono, Tomohiro 936d7407606SMisono, Tomohiro out: 937d7407606SMisono, Tomohiro kfree(orig); 938d7407606SMisono, Tomohiro return error; 939d7407606SMisono, Tomohiro } 940d7407606SMisono, Tomohiro 941d7407606SMisono, Tomohiro /* 942d7407606SMisono, Tomohiro * Parse mount options that are related to subvolume id 943d7407606SMisono, Tomohiro * 944d7407606SMisono, Tomohiro * The value is later passed to mount_subvol() 945d7407606SMisono, Tomohiro */ 94693b9bcdfSGu Jinxiang static int btrfs_parse_subvol_options(const char *options, char **subvol_name, 94793b9bcdfSGu Jinxiang u64 *subvol_objectid) 948d7407606SMisono, Tomohiro { 949d7407606SMisono, Tomohiro substring_t args[MAX_OPT_ARGS]; 950d7407606SMisono, Tomohiro char *opts, *orig, *p; 951edf24abeSChristoph Hellwig int error = 0; 952ccb0e7d1SAnand Jain u64 subvolid; 953edf24abeSChristoph Hellwig 954edf24abeSChristoph Hellwig if (!options) 955830c4adbSJosef Bacik return 0; 956edf24abeSChristoph Hellwig 957edf24abeSChristoph Hellwig /* 958d7407606SMisono, Tomohiro * strsep changes the string, duplicate it because 959fa59f27cSAnand Jain * btrfs_parse_device_options gets called later 960edf24abeSChristoph Hellwig */ 961edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 962edf24abeSChristoph Hellwig if (!opts) 963edf24abeSChristoph Hellwig return -ENOMEM; 9643f3d0bc0STero Roponen orig = opts; 965edf24abeSChristoph Hellwig 966edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 967edf24abeSChristoph Hellwig int token; 968edf24abeSChristoph Hellwig if (!*p) 969edf24abeSChristoph Hellwig continue; 970edf24abeSChristoph Hellwig 971edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 972edf24abeSChristoph Hellwig switch (token) { 973edf24abeSChristoph Hellwig case Opt_subvol: 974a90e8b6fSIlya Dryomov kfree(*subvol_name); 975edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 9762c334e87SWang Shilong if (!*subvol_name) { 9772c334e87SWang Shilong error = -ENOMEM; 9782c334e87SWang Shilong goto out; 9792c334e87SWang Shilong } 980edf24abeSChristoph Hellwig break; 98173f73415SJosef Bacik case Opt_subvolid: 982ccb0e7d1SAnand Jain error = match_u64(&args[0], &subvolid); 983ccb0e7d1SAnand Jain if (error) 9842c334e87SWang Shilong goto out; 985ccb0e7d1SAnand Jain 986ccb0e7d1SAnand Jain /* we want the original fs_tree */ 987ccb0e7d1SAnand Jain if (subvolid == 0) 988ccb0e7d1SAnand Jain subvolid = BTRFS_FS_TREE_OBJECTID; 989ccb0e7d1SAnand Jain 990ccb0e7d1SAnand Jain *subvol_objectid = subvolid; 99173f73415SJosef Bacik break; 992e15d0542SXin Zhong case Opt_subvolrootid: 99362e85577SJeff Mahoney pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n"); 994e15d0542SXin Zhong break; 995edf24abeSChristoph Hellwig default: 996edf24abeSChristoph Hellwig break; 997edf24abeSChristoph Hellwig } 998edf24abeSChristoph Hellwig } 999edf24abeSChristoph Hellwig 1000edf24abeSChristoph Hellwig out: 1001830c4adbSJosef Bacik kfree(orig); 1002edf24abeSChristoph Hellwig return error; 100395e05289SChris Mason } 100495e05289SChris Mason 100505dbe683SOmar Sandoval static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 100673f73415SJosef Bacik u64 subvol_objectid) 100773f73415SJosef Bacik { 1008815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 100905dbe683SOmar Sandoval struct btrfs_root *fs_root; 101005dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 101105dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 101205dbe683SOmar Sandoval struct btrfs_key key; 101305dbe683SOmar Sandoval struct btrfs_path *path = NULL; 101405dbe683SOmar Sandoval char *name = NULL, *ptr; 101505dbe683SOmar Sandoval u64 dirid; 101605dbe683SOmar Sandoval int len; 101705dbe683SOmar Sandoval int ret; 101805dbe683SOmar Sandoval 101905dbe683SOmar Sandoval path = btrfs_alloc_path(); 102005dbe683SOmar Sandoval if (!path) { 102105dbe683SOmar Sandoval ret = -ENOMEM; 102205dbe683SOmar Sandoval goto err; 102305dbe683SOmar Sandoval } 102405dbe683SOmar Sandoval path->leave_spinning = 1; 102505dbe683SOmar Sandoval 10263ec83621SDavid Sterba name = kmalloc(PATH_MAX, GFP_KERNEL); 102705dbe683SOmar Sandoval if (!name) { 102805dbe683SOmar Sandoval ret = -ENOMEM; 102905dbe683SOmar Sandoval goto err; 103005dbe683SOmar Sandoval } 103105dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 103205dbe683SOmar Sandoval ptr[0] = '\0'; 103305dbe683SOmar Sandoval 103405dbe683SOmar Sandoval /* 103505dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 103605dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 103705dbe683SOmar Sandoval */ 103805dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 103905dbe683SOmar Sandoval key.objectid = subvol_objectid; 104005dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 104105dbe683SOmar Sandoval key.offset = (u64)-1; 104205dbe683SOmar Sandoval 104305dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 104405dbe683SOmar Sandoval if (ret < 0) { 104505dbe683SOmar Sandoval goto err; 104605dbe683SOmar Sandoval } else if (ret > 0) { 104705dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 104805dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 104905dbe683SOmar Sandoval if (ret < 0) { 105005dbe683SOmar Sandoval goto err; 105105dbe683SOmar Sandoval } else if (ret > 0) { 105205dbe683SOmar Sandoval ret = -ENOENT; 105305dbe683SOmar Sandoval goto err; 105405dbe683SOmar Sandoval } 105505dbe683SOmar Sandoval } 105605dbe683SOmar Sandoval 105705dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 105805dbe683SOmar Sandoval subvol_objectid = key.offset; 105905dbe683SOmar Sandoval 106005dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 106105dbe683SOmar Sandoval struct btrfs_root_ref); 106205dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 106305dbe683SOmar Sandoval ptr -= len + 1; 106405dbe683SOmar Sandoval if (ptr < name) { 106505dbe683SOmar Sandoval ret = -ENAMETOOLONG; 106605dbe683SOmar Sandoval goto err; 106705dbe683SOmar Sandoval } 106805dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 106905dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 107005dbe683SOmar Sandoval ptr[0] = '/'; 107105dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 107205dbe683SOmar Sandoval btrfs_release_path(path); 107305dbe683SOmar Sandoval 107405dbe683SOmar Sandoval key.objectid = subvol_objectid; 107505dbe683SOmar Sandoval key.type = BTRFS_ROOT_ITEM_KEY; 107605dbe683SOmar Sandoval key.offset = (u64)-1; 107705dbe683SOmar Sandoval fs_root = btrfs_read_fs_root_no_name(fs_info, &key); 107805dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 107905dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 108005dbe683SOmar Sandoval goto err; 108105dbe683SOmar Sandoval } 108205dbe683SOmar Sandoval 108305dbe683SOmar Sandoval /* 108405dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 108505dbe683SOmar Sandoval * root directory. 108605dbe683SOmar Sandoval */ 108705dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 108805dbe683SOmar Sandoval key.objectid = dirid; 108905dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 109005dbe683SOmar Sandoval key.offset = (u64)-1; 109105dbe683SOmar Sandoval 109205dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 109305dbe683SOmar Sandoval if (ret < 0) { 109405dbe683SOmar Sandoval goto err; 109505dbe683SOmar Sandoval } else if (ret > 0) { 109605dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 109705dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 109805dbe683SOmar Sandoval if (ret < 0) { 109905dbe683SOmar Sandoval goto err; 110005dbe683SOmar Sandoval } else if (ret > 0) { 110105dbe683SOmar Sandoval ret = -ENOENT; 110205dbe683SOmar Sandoval goto err; 110305dbe683SOmar Sandoval } 110405dbe683SOmar Sandoval } 110505dbe683SOmar Sandoval 110605dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 110705dbe683SOmar Sandoval dirid = key.offset; 110805dbe683SOmar Sandoval 110905dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 111005dbe683SOmar Sandoval path->slots[0], 111105dbe683SOmar Sandoval struct btrfs_inode_ref); 111205dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 111305dbe683SOmar Sandoval inode_ref); 111405dbe683SOmar Sandoval ptr -= len + 1; 111505dbe683SOmar Sandoval if (ptr < name) { 111605dbe683SOmar Sandoval ret = -ENAMETOOLONG; 111705dbe683SOmar Sandoval goto err; 111805dbe683SOmar Sandoval } 111905dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 112005dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 112105dbe683SOmar Sandoval ptr[0] = '/'; 112205dbe683SOmar Sandoval btrfs_release_path(path); 112305dbe683SOmar Sandoval } 112405dbe683SOmar Sandoval } 112505dbe683SOmar Sandoval 112605dbe683SOmar Sandoval btrfs_free_path(path); 112705dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 112805dbe683SOmar Sandoval name[0] = '/'; 112905dbe683SOmar Sandoval name[1] = '\0'; 113005dbe683SOmar Sandoval } else { 113105dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 113205dbe683SOmar Sandoval } 113305dbe683SOmar Sandoval return name; 113405dbe683SOmar Sandoval 113505dbe683SOmar Sandoval err: 113605dbe683SOmar Sandoval btrfs_free_path(path); 113705dbe683SOmar Sandoval kfree(name); 113805dbe683SOmar Sandoval return ERR_PTR(ret); 113905dbe683SOmar Sandoval } 114005dbe683SOmar Sandoval 114105dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 114205dbe683SOmar Sandoval { 114305dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 114473f73415SJosef Bacik struct btrfs_dir_item *di; 114573f73415SJosef Bacik struct btrfs_path *path; 114673f73415SJosef Bacik struct btrfs_key location; 114773f73415SJosef Bacik u64 dir_id; 114873f73415SJosef Bacik 114973f73415SJosef Bacik path = btrfs_alloc_path(); 115073f73415SJosef Bacik if (!path) 115105dbe683SOmar Sandoval return -ENOMEM; 115273f73415SJosef Bacik path->leave_spinning = 1; 115373f73415SJosef Bacik 115473f73415SJosef Bacik /* 115573f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 115673f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 115773f73415SJosef Bacik * to mount. 115873f73415SJosef Bacik */ 1159815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 116073f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1161b0839166SJulia Lawall if (IS_ERR(di)) { 1162b0839166SJulia Lawall btrfs_free_path(path); 116305dbe683SOmar Sandoval return PTR_ERR(di); 1164b0839166SJulia Lawall } 116573f73415SJosef Bacik if (!di) { 116673f73415SJosef Bacik /* 116773f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 116873f73415SJosef Bacik * it's always been there, but don't freak out, just try and 116905dbe683SOmar Sandoval * mount the top-level subvolume. 117073f73415SJosef Bacik */ 117173f73415SJosef Bacik btrfs_free_path(path); 117205dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 117305dbe683SOmar Sandoval return 0; 117473f73415SJosef Bacik } 117573f73415SJosef Bacik 117673f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 117773f73415SJosef Bacik btrfs_free_path(path); 117805dbe683SOmar Sandoval *objectid = location.objectid; 117905dbe683SOmar Sandoval return 0; 118073f73415SJosef Bacik } 118173f73415SJosef Bacik 11828a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 11838a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 118456e033a7SDavid Sterba void *data) 11852e635a27SChris Mason { 11862e635a27SChris Mason struct inode *inode; 1187815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 11885d4f98a2SYan Zheng struct btrfs_key key; 118939279cc3SChris Mason int err; 11902e635a27SChris Mason 11912e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 11922e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1193e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1194af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1195be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 11965103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 11972e635a27SChris Mason sb->s_time_gran = 1; 11980eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 11991751e8a6SLinus Torvalds sb->s_flags |= SB_POSIXACL; 120049cf6f45SChris Ball #endif 1201357fdad0SMatthew Garrett sb->s_flags |= SB_I_VERSION; 1202da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 12039e11ceeeSJan Kara 12049e11ceeeSJan Kara err = super_setup_bdi(sb); 12059e11ceeeSJan Kara if (err) { 12069e11ceeeSJan Kara btrfs_err(fs_info, "super_setup_bdi failed"); 12079e11ceeeSJan Kara return err; 12089e11ceeeSJan Kara } 12099e11ceeeSJan Kara 1210ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1211ad2b2c80SAl Viro if (err) { 1212ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "open_ctree failed"); 1213ad2b2c80SAl Viro return err; 1214e20d96d6SChris Mason } 1215b888db2bSChris Mason 12165d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 12175d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 12185d4f98a2SYan Zheng key.offset = 0; 121998c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 12205d4f98a2SYan Zheng if (IS_ERR(inode)) { 12215d4f98a2SYan Zheng err = PTR_ERR(inode); 122239279cc3SChris Mason goto fail_close; 122339279cc3SChris Mason } 12242e635a27SChris Mason 122548fde701SAl Viro sb->s_root = d_make_root(inode); 122648fde701SAl Viro if (!sb->s_root) { 122739279cc3SChris Mason err = -ENOMEM; 122839279cc3SChris Mason goto fail_close; 12292e635a27SChris Mason } 123058176a96SJosef Bacik 123190a887c9SDan Magenheimer cleancache_init_fs(sb); 12321751e8a6SLinus Torvalds sb->s_flags |= SB_ACTIVE; 12332e635a27SChris Mason return 0; 12342e635a27SChris Mason 123539279cc3SChris Mason fail_close: 12366bccf3abSJeff Mahoney close_ctree(fs_info); 1237d5719762SChris Mason return err; 1238d5719762SChris Mason } 1239d5719762SChris Mason 12406bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1241d5719762SChris Mason { 1242d5719762SChris Mason struct btrfs_trans_handle *trans; 1243815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1244815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1245df2ce34cSChris Mason 1246bc074524SJeff Mahoney trace_btrfs_sync_fs(fs_info, wait); 12471abe9b8aSliubo 1248d561c025SChris Mason if (!wait) { 1249815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1250df2ce34cSChris Mason return 0; 1251d561c025SChris Mason } 1252771ed689SChris Mason 12536374e57aSChris Mason btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); 1254771ed689SChris Mason 1255d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 125660376ce4SJosef Bacik if (IS_ERR(trans)) { 1257354aa0fbSMiao Xie /* no transaction, don't bother */ 12586b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 12596b5fe46dSDavid Sterba /* 12606b5fe46dSDavid Sterba * Exit unless we have some pending changes 12616b5fe46dSDavid Sterba * that need to go through commit 12626b5fe46dSDavid Sterba */ 12636b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1264bd7de2c9SJosef Bacik return 0; 1265a53f4f8eSQu Wenruo /* 1266a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1267a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1268a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1269a53f4f8eSQu Wenruo * next commit after thawing. 1270a53f4f8eSQu Wenruo */ 1271a7e3c5f2SRakesh Pandit if (sb_start_write_trylock(sb)) 1272a7e3c5f2SRakesh Pandit sb_end_write(sb); 1273a53f4f8eSQu Wenruo else 1274a53f4f8eSQu Wenruo return 0; 12756b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 127660376ce4SJosef Bacik } 127798bd5c54SDavid Sterba if (IS_ERR(trans)) 127898bd5c54SDavid Sterba return PTR_ERR(trans); 12796b5fe46dSDavid Sterba } 12803a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 1281d5719762SChris Mason } 1282d5719762SChris Mason 128334c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1284a9572a15SEric Paris { 1285815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 12860f628c63SDavid Sterba const char *compress_type; 1287a9572a15SEric Paris 12883cdde224SJeff Mahoney if (btrfs_test_opt(info, DEGRADED)) 1289a9572a15SEric Paris seq_puts(seq, ",degraded"); 12903cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATASUM)) 1291a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 12923cdde224SJeff Mahoney if (btrfs_test_opt(info, NODATACOW)) 1293a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 12943cdde224SJeff Mahoney if (btrfs_test_opt(info, NOBARRIER)) 1295a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 129695ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1297c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1298a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1299a9572a15SEric Paris num_online_cpus() + 2, 8)) 1300f7b885beSAnand Jain seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); 13013cdde224SJeff Mahoney if (btrfs_test_opt(info, COMPRESS)) { 13020f628c63SDavid Sterba compress_type = btrfs_compress_type2str(info->compress_type); 13033cdde224SJeff Mahoney if (btrfs_test_opt(info, FORCE_COMPRESS)) 1304200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1305200da64eSTsutomu Itoh else 1306200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1307f51d2b59SDavid Sterba if (info->compress_level) 1308fa4d885aSAdam Borowski seq_printf(seq, ":%d", info->compress_level); 1309200da64eSTsutomu Itoh } 13103cdde224SJeff Mahoney if (btrfs_test_opt(info, NOSSD)) 1311c289811cSChris Mason seq_puts(seq, ",nossd"); 13123cdde224SJeff Mahoney if (btrfs_test_opt(info, SSD_SPREAD)) 1313451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 13143cdde224SJeff Mahoney else if (btrfs_test_opt(info, SSD)) 1315a9572a15SEric Paris seq_puts(seq, ",ssd"); 13163cdde224SJeff Mahoney if (btrfs_test_opt(info, NOTREELOG)) 13176b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 13183cdde224SJeff Mahoney if (btrfs_test_opt(info, NOLOGREPLAY)) 131996da0919SQu Wenruo seq_puts(seq, ",nologreplay"); 13203cdde224SJeff Mahoney if (btrfs_test_opt(info, FLUSHONCOMMIT)) 13216b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 13223cdde224SJeff Mahoney if (btrfs_test_opt(info, DISCARD)) 132320a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 13241751e8a6SLinus Torvalds if (!(info->sb->s_flags & SB_POSIXACL)) 1325a9572a15SEric Paris seq_puts(seq, ",noacl"); 13263cdde224SJeff Mahoney if (btrfs_test_opt(info, SPACE_CACHE)) 1327200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 13283cdde224SJeff Mahoney else if (btrfs_test_opt(info, FREE_SPACE_TREE)) 132970f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 133073bc1876SJosef Bacik else 13318965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 13323cdde224SJeff Mahoney if (btrfs_test_opt(info, RESCAN_UUID_TREE)) 1333f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 13343cdde224SJeff Mahoney if (btrfs_test_opt(info, CLEAR_CACHE)) 1335200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 13363cdde224SJeff Mahoney if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) 1337200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 13383cdde224SJeff Mahoney if (btrfs_test_opt(info, ENOSPC_DEBUG)) 13390942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 13403cdde224SJeff Mahoney if (btrfs_test_opt(info, AUTO_DEFRAG)) 13410942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 13423cdde224SJeff Mahoney if (btrfs_test_opt(info, INODE_MAP_CACHE)) 13430942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 13443cdde224SJeff Mahoney if (btrfs_test_opt(info, SKIP_BALANCE)) 13459555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 13468507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 13473cdde224SJeff Mahoney if (btrfs_test_opt(info, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 13488507d216SWang Shilong seq_puts(seq, ",check_int_data"); 13493cdde224SJeff Mahoney else if (btrfs_test_opt(info, CHECK_INTEGRITY)) 13508507d216SWang Shilong seq_puts(seq, ",check_int"); 13518507d216SWang Shilong if (info->check_integrity_print_mask) 13528507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 13538507d216SWang Shilong info->check_integrity_print_mask); 13548507d216SWang Shilong #endif 13558507d216SWang Shilong if (info->metadata_ratio) 1356764cb8b4SAnand Jain seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); 13573cdde224SJeff Mahoney if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) 13588c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 13598b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 1360d3740608SAnand Jain seq_printf(seq, ",commit=%u", info->commit_interval); 1361d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 13623cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_DATA)) 1363d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 13643cdde224SJeff Mahoney if (btrfs_test_opt(info, FRAGMENT_METADATA)) 1365d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1366d0bd4560SJosef Bacik #endif 1367fb592373SJosef Bacik if (btrfs_test_opt(info, REF_VERIFY)) 1368fb592373SJosef Bacik seq_puts(seq, ",ref_verify"); 1369c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1370c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 1371c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 1372c8d3fe02SOmar Sandoval seq_dentry(seq, dentry, " \t\n\\"); 1373a9572a15SEric Paris return 0; 1374a9572a15SEric Paris } 1375a9572a15SEric Paris 1376a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 13772e635a27SChris Mason { 1378815745cfSAl Viro struct btrfs_fs_info *p = data; 1379815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 13804b82d6e4SYan 1381815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 13824b82d6e4SYan } 13834b82d6e4SYan 1384450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1385450ba0eaSJosef Bacik { 13866de1d09dSAl Viro int err = set_anon_super(s, data); 13876de1d09dSAl Viro if (!err) 1388450ba0eaSJosef Bacik s->s_fs_info = data; 13896de1d09dSAl Viro return err; 1390450ba0eaSJosef Bacik } 1391450ba0eaSJosef Bacik 1392830c4adbSJosef Bacik /* 1393f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1394f9d9ef62SDavid Sterba */ 1395f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1396f9d9ef62SDavid Sterba { 1397f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1398f9d9ef62SDavid Sterba return 1; 1399f9d9ef62SDavid Sterba return 0; 1400f9d9ef62SDavid Sterba } 1401f9d9ef62SDavid Sterba 1402bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1403ae0bc863SAnand Jain struct vfsmount *mnt) 1404830c4adbSJosef Bacik { 1405830c4adbSJosef Bacik struct dentry *root; 1406fa330659SOmar Sandoval int ret; 1407830c4adbSJosef Bacik 140805dbe683SOmar Sandoval if (!subvol_name) { 140905dbe683SOmar Sandoval if (!subvol_objectid) { 141005dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 141105dbe683SOmar Sandoval &subvol_objectid); 141205dbe683SOmar Sandoval if (ret) { 141305dbe683SOmar Sandoval root = ERR_PTR(ret); 141405dbe683SOmar Sandoval goto out; 141505dbe683SOmar Sandoval } 141605dbe683SOmar Sandoval } 141705dbe683SOmar Sandoval subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), 141805dbe683SOmar Sandoval subvol_objectid); 141905dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 142005dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 142105dbe683SOmar Sandoval subvol_name = NULL; 142205dbe683SOmar Sandoval goto out; 142305dbe683SOmar Sandoval } 142405dbe683SOmar Sandoval 142505dbe683SOmar Sandoval } 142605dbe683SOmar Sandoval 1427ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1428fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1429fa330659SOmar Sandoval mnt = NULL; 1430830c4adbSJosef Bacik 1431bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1432ea441d11SAl Viro struct super_block *s = root->d_sb; 1433ab8d0fc4SJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(s); 1434bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1435bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1436bb289b7bSOmar Sandoval 1437bb289b7bSOmar Sandoval ret = 0; 1438bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1439ab8d0fc4SJeff Mahoney btrfs_err(fs_info, "'%s' is not a valid subvolume", 1440bb289b7bSOmar Sandoval subvol_name); 1441bb289b7bSOmar Sandoval ret = -EINVAL; 1442bb289b7bSOmar Sandoval } 1443bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 144405dbe683SOmar Sandoval /* 144505dbe683SOmar Sandoval * This will also catch a race condition where a 144605dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 144705dbe683SOmar Sandoval * another subvolume is renamed over the old location. 144805dbe683SOmar Sandoval */ 1449ab8d0fc4SJeff Mahoney btrfs_err(fs_info, 1450ab8d0fc4SJeff Mahoney "subvol '%s' does not match subvolid %llu", 1451bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1452bb289b7bSOmar Sandoval ret = -EINVAL; 1453bb289b7bSOmar Sandoval } 1454bb289b7bSOmar Sandoval if (ret) { 1455ea441d11SAl Viro dput(root); 1456bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1457ea441d11SAl Viro deactivate_locked_super(s); 1458bb289b7bSOmar Sandoval } 1459f9d9ef62SDavid Sterba } 1460f9d9ef62SDavid Sterba 1461fa330659SOmar Sandoval out: 1462fa330659SOmar Sandoval mntput(mnt); 1463fa330659SOmar Sandoval kfree(subvol_name); 1464830c4adbSJosef Bacik return root; 1465830c4adbSJosef Bacik } 1466450ba0eaSJosef Bacik 1467312c89fbSMisono, Tomohiro /* 1468312c89fbSMisono, Tomohiro * Find a superblock for the given device / mount point. 1469312c89fbSMisono, Tomohiro * 1470312c89fbSMisono, Tomohiro * Note: This is based on mount_bdev from fs/super.c with a few additions 1471312c89fbSMisono, Tomohiro * for multiple device setup. Make sure to keep it in sync. 1472312c89fbSMisono, Tomohiro */ 147372fa39f5SMisono, Tomohiro static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, 147472fa39f5SMisono, Tomohiro int flags, const char *device_name, void *data) 147572fa39f5SMisono, Tomohiro { 147672fa39f5SMisono, Tomohiro struct block_device *bdev = NULL; 147772fa39f5SMisono, Tomohiro struct super_block *s; 147836350e95SGu Jinxiang struct btrfs_device *device = NULL; 147972fa39f5SMisono, Tomohiro struct btrfs_fs_devices *fs_devices = NULL; 148072fa39f5SMisono, Tomohiro struct btrfs_fs_info *fs_info = NULL; 1481204cc0ccSAl Viro void *new_sec_opts = NULL; 148272fa39f5SMisono, Tomohiro fmode_t mode = FMODE_READ; 148372fa39f5SMisono, Tomohiro int error = 0; 148472fa39f5SMisono, Tomohiro 148572fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY)) 148672fa39f5SMisono, Tomohiro mode |= FMODE_WRITE; 148772fa39f5SMisono, Tomohiro 148872fa39f5SMisono, Tomohiro if (data) { 1489a65001e8SAl Viro error = security_sb_eat_lsm_opts(data, &new_sec_opts); 149072fa39f5SMisono, Tomohiro if (error) 149172fa39f5SMisono, Tomohiro return ERR_PTR(error); 149272fa39f5SMisono, Tomohiro } 149372fa39f5SMisono, Tomohiro 149472fa39f5SMisono, Tomohiro /* 149572fa39f5SMisono, Tomohiro * Setup a dummy root and fs_info for test/set super. This is because 149672fa39f5SMisono, Tomohiro * we don't actually fill this stuff out until open_ctree, but we need 149772fa39f5SMisono, Tomohiro * it for searching for existing supers, so this lets us do that and 149872fa39f5SMisono, Tomohiro * then open_ctree will properly initialize everything later. 149972fa39f5SMisono, Tomohiro */ 1500a8fd1f71SJeff Mahoney fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); 150172fa39f5SMisono, Tomohiro if (!fs_info) { 150272fa39f5SMisono, Tomohiro error = -ENOMEM; 150372fa39f5SMisono, Tomohiro goto error_sec_opts; 150472fa39f5SMisono, Tomohiro } 150572fa39f5SMisono, Tomohiro 150672fa39f5SMisono, Tomohiro fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 150772fa39f5SMisono, Tomohiro fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); 150872fa39f5SMisono, Tomohiro if (!fs_info->super_copy || !fs_info->super_for_commit) { 150972fa39f5SMisono, Tomohiro error = -ENOMEM; 151072fa39f5SMisono, Tomohiro goto error_fs_info; 151172fa39f5SMisono, Tomohiro } 151272fa39f5SMisono, Tomohiro 1513f5194e34SDavid Sterba mutex_lock(&uuid_mutex); 1514fa59f27cSAnand Jain error = btrfs_parse_device_options(data, mode, fs_type); 151581ffd56bSDavid Sterba if (error) { 1516399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 1517399f7f4cSDavid Sterba goto error_fs_info; 151881ffd56bSDavid Sterba } 1519399f7f4cSDavid Sterba 152036350e95SGu Jinxiang device = btrfs_scan_one_device(device_name, mode, fs_type); 152136350e95SGu Jinxiang if (IS_ERR(device)) { 1522399f7f4cSDavid Sterba mutex_unlock(&uuid_mutex); 152336350e95SGu Jinxiang error = PTR_ERR(device); 1524399f7f4cSDavid Sterba goto error_fs_info; 152581ffd56bSDavid Sterba } 1526399f7f4cSDavid Sterba 152736350e95SGu Jinxiang fs_devices = device->fs_devices; 1528399f7f4cSDavid Sterba fs_info->fs_devices = fs_devices; 1529399f7f4cSDavid Sterba 153072fa39f5SMisono, Tomohiro error = btrfs_open_devices(fs_devices, mode, fs_type); 1531f5194e34SDavid Sterba mutex_unlock(&uuid_mutex); 153272fa39f5SMisono, Tomohiro if (error) 153372fa39f5SMisono, Tomohiro goto error_fs_info; 153472fa39f5SMisono, Tomohiro 153572fa39f5SMisono, Tomohiro if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { 153672fa39f5SMisono, Tomohiro error = -EACCES; 153772fa39f5SMisono, Tomohiro goto error_close_devices; 153872fa39f5SMisono, Tomohiro } 153972fa39f5SMisono, Tomohiro 154072fa39f5SMisono, Tomohiro bdev = fs_devices->latest_bdev; 154172fa39f5SMisono, Tomohiro s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, 154272fa39f5SMisono, Tomohiro fs_info); 154372fa39f5SMisono, Tomohiro if (IS_ERR(s)) { 154472fa39f5SMisono, Tomohiro error = PTR_ERR(s); 154572fa39f5SMisono, Tomohiro goto error_close_devices; 154672fa39f5SMisono, Tomohiro } 154772fa39f5SMisono, Tomohiro 154872fa39f5SMisono, Tomohiro if (s->s_root) { 154972fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 155072fa39f5SMisono, Tomohiro free_fs_info(fs_info); 155172fa39f5SMisono, Tomohiro if ((flags ^ s->s_flags) & SB_RDONLY) 155272fa39f5SMisono, Tomohiro error = -EBUSY; 155372fa39f5SMisono, Tomohiro } else { 155472fa39f5SMisono, Tomohiro snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 155572fa39f5SMisono, Tomohiro btrfs_sb(s)->bdev_holder = fs_type; 15569b4e675aSDavid Sterba if (!strstr(crc32c_impl(), "generic")) 15579b4e675aSDavid Sterba set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); 155872fa39f5SMisono, Tomohiro error = btrfs_fill_super(s, fs_devices, data); 155972fa39f5SMisono, Tomohiro } 1560a65001e8SAl Viro if (!error) 1561204cc0ccSAl Viro error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL); 1562a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 156372fa39f5SMisono, Tomohiro if (error) { 156472fa39f5SMisono, Tomohiro deactivate_locked_super(s); 1565a65001e8SAl Viro return ERR_PTR(error); 156672fa39f5SMisono, Tomohiro } 156772fa39f5SMisono, Tomohiro 156872fa39f5SMisono, Tomohiro return dget(s->s_root); 156972fa39f5SMisono, Tomohiro 157072fa39f5SMisono, Tomohiro error_close_devices: 157172fa39f5SMisono, Tomohiro btrfs_close_devices(fs_devices); 157272fa39f5SMisono, Tomohiro error_fs_info: 157372fa39f5SMisono, Tomohiro free_fs_info(fs_info); 157472fa39f5SMisono, Tomohiro error_sec_opts: 157572fa39f5SMisono, Tomohiro security_free_mnt_opts(&new_sec_opts); 157672fa39f5SMisono, Tomohiro return ERR_PTR(error); 157772fa39f5SMisono, Tomohiro } 1578312c89fbSMisono, Tomohiro 1579edf24abeSChristoph Hellwig /* 1580312c89fbSMisono, Tomohiro * Mount function which is called by VFS layer. 1581edf24abeSChristoph Hellwig * 1582312c89fbSMisono, Tomohiro * In order to allow mounting a subvolume directly, btrfs uses mount_subtree() 1583312c89fbSMisono, Tomohiro * which needs vfsmount* of device's root (/). This means device's root has to 1584312c89fbSMisono, Tomohiro * be mounted internally in any case. 1585312c89fbSMisono, Tomohiro * 1586312c89fbSMisono, Tomohiro * Operation flow: 1587312c89fbSMisono, Tomohiro * 1. Parse subvol id related options for later use in mount_subvol(). 1588312c89fbSMisono, Tomohiro * 1589312c89fbSMisono, Tomohiro * 2. Mount device's root (/) by calling vfs_kern_mount(). 1590312c89fbSMisono, Tomohiro * 1591312c89fbSMisono, Tomohiro * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the 1592312c89fbSMisono, Tomohiro * first place. In order to avoid calling btrfs_mount() again, we use 1593312c89fbSMisono, Tomohiro * different file_system_type which is not registered to VFS by 1594312c89fbSMisono, Tomohiro * register_filesystem() (btrfs_root_fs_type). As a result, 1595312c89fbSMisono, Tomohiro * btrfs_mount_root() is called. The return value will be used by 1596312c89fbSMisono, Tomohiro * mount_subtree() in mount_subvol(). 1597312c89fbSMisono, Tomohiro * 1598312c89fbSMisono, Tomohiro * 3. Call mount_subvol() to get the dentry of subvolume. Since there is 1599312c89fbSMisono, Tomohiro * "btrfs subvolume set-default", mount_subvol() is called always. 1600edf24abeSChristoph Hellwig */ 1601061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1602306e16ceSDavid Sterba const char *device_name, void *data) 16034b82d6e4SYan { 1604312c89fbSMisono, Tomohiro struct vfsmount *mnt_root; 1605312c89fbSMisono, Tomohiro struct dentry *root; 160673f73415SJosef Bacik char *subvol_name = NULL; 160773f73415SJosef Bacik u64 subvol_objectid = 0; 16084b82d6e4SYan int error = 0; 16094b82d6e4SYan 161093b9bcdfSGu Jinxiang error = btrfs_parse_subvol_options(data, &subvol_name, 161193b9bcdfSGu Jinxiang &subvol_objectid); 1612f23c8af8SIlya Dryomov if (error) { 1613f23c8af8SIlya Dryomov kfree(subvol_name); 1614061dbc6bSAl Viro return ERR_PTR(error); 1615f23c8af8SIlya Dryomov } 1616edf24abeSChristoph Hellwig 1617312c89fbSMisono, Tomohiro /* mount device's root (/) */ 1618312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); 1619312c89fbSMisono, Tomohiro if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { 1620312c89fbSMisono, Tomohiro if (flags & SB_RDONLY) { 1621312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1622312c89fbSMisono, Tomohiro flags & ~SB_RDONLY, device_name, data); 16234b82d6e4SYan } else { 1624312c89fbSMisono, Tomohiro mnt_root = vfs_kern_mount(&btrfs_root_fs_type, 1625312c89fbSMisono, Tomohiro flags | SB_RDONLY, device_name, data); 1626312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1627312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1628532b618bSEric W. Biederman kfree(subvol_name); 1629312c89fbSMisono, Tomohiro goto out; 1630f667aef6SQu Wenruo } 1631f667aef6SQu Wenruo 1632312c89fbSMisono, Tomohiro down_write(&mnt_root->mnt_sb->s_umount); 1633312c89fbSMisono, Tomohiro error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); 1634312c89fbSMisono, Tomohiro up_write(&mnt_root->mnt_sb->s_umount); 1635312c89fbSMisono, Tomohiro if (error < 0) { 1636312c89fbSMisono, Tomohiro root = ERR_PTR(error); 1637312c89fbSMisono, Tomohiro mntput(mnt_root); 1638532b618bSEric W. Biederman kfree(subvol_name); 1639312c89fbSMisono, Tomohiro goto out; 1640312c89fbSMisono, Tomohiro } 1641312c89fbSMisono, Tomohiro } 1642312c89fbSMisono, Tomohiro } 1643312c89fbSMisono, Tomohiro if (IS_ERR(mnt_root)) { 1644312c89fbSMisono, Tomohiro root = ERR_CAST(mnt_root); 1645532b618bSEric W. Biederman kfree(subvol_name); 1646312c89fbSMisono, Tomohiro goto out; 1647f667aef6SQu Wenruo } 16484b82d6e4SYan 1649312c89fbSMisono, Tomohiro /* mount_subvol() will free subvol_name and mnt_root */ 1650ae0bc863SAnand Jain root = mount_subvol(subvol_name, subvol_objectid, mnt_root); 16514b82d6e4SYan 1652312c89fbSMisono, Tomohiro out: 1653312c89fbSMisono, Tomohiro return root; 16544b82d6e4SYan } 16552e635a27SChris Mason 16560d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 1657f7b885beSAnand Jain u32 new_pool_size, u32 old_pool_size) 16580d2450abSSergei Trofimovich { 16590d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 16600d2450abSSergei Trofimovich return; 16610d2450abSSergei Trofimovich 16620d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 16630d2450abSSergei Trofimovich 1664efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 16650d2450abSSergei Trofimovich old_pool_size, new_pool_size); 16660d2450abSSergei Trofimovich 16675cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1668afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1669a8c93d4eSQu Wenruo btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1670e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1671fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1672fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1673fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1674fccb5d86SQu Wenruo new_pool_size); 1675fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1676fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 16775b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1678736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 16790339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1680ff023aacSStefan Behrens new_pool_size); 16810d2450abSSergei Trofimovich } 16820d2450abSSergei Trofimovich 1683f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1684dc81cdc5SMiao Xie { 1685dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1686f42a34b2SMiao Xie } 1687dc81cdc5SMiao Xie 1688f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1689f42a34b2SMiao Xie unsigned long old_opts, int flags) 1690f42a34b2SMiao Xie { 1691dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1692dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 16931751e8a6SLinus Torvalds (flags & SB_RDONLY))) { 1694dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1695dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1696dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 16971751e8a6SLinus Torvalds if (flags & SB_RDONLY) 1698dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1699dc81cdc5SMiao Xie } 1700dc81cdc5SMiao Xie } 1701dc81cdc5SMiao Xie 1702dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1703dc81cdc5SMiao Xie unsigned long old_opts) 1704dc81cdc5SMiao Xie { 1705dc81cdc5SMiao Xie /* 1706180e4d47SLuis de Bethencourt * We need to cleanup all defragable inodes if the autodefragment is 1707180e4d47SLuis de Bethencourt * close or the filesystem is read only. 1708dc81cdc5SMiao Xie */ 1709dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1710bc98a42cSDavid Howells (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { 1711dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1712dc81cdc5SMiao Xie } 1713dc81cdc5SMiao Xie 1714dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1715dc81cdc5SMiao Xie } 1716dc81cdc5SMiao Xie 1717c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1718c146afadSYan Zheng { 1719815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1720815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 172149b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 172249b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 172349b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 172449b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 1725f7b885beSAnand Jain u32 old_thread_pool_size = fs_info->thread_pool_size; 1726d612ac59SAnand Jain u32 old_metadata_ratio = fs_info->metadata_ratio; 1727c146afadSYan Zheng int ret; 1728c146afadSYan Zheng 172902b9984dSTheodore Ts'o sync_filesystem(sb); 1730f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1731dc81cdc5SMiao Xie 1732f667aef6SQu Wenruo if (data) { 1733204cc0ccSAl Viro void *new_sec_opts = NULL; 1734f667aef6SQu Wenruo 1735a65001e8SAl Viro ret = security_sb_eat_lsm_opts(data, &new_sec_opts); 1736a65001e8SAl Viro if (!ret) 1737204cc0ccSAl Viro ret = security_sb_remount(sb, new_sec_opts); 1738a65001e8SAl Viro security_free_mnt_opts(&new_sec_opts); 1739f667aef6SQu Wenruo if (ret) 1740f667aef6SQu Wenruo goto restore; 1741f667aef6SQu Wenruo } 1742f667aef6SQu Wenruo 17432ff7e61eSJeff Mahoney ret = btrfs_parse_options(fs_info, data, *flags); 1744891f41cbSChengguang Xu if (ret) 174549b25e05SJeff Mahoney goto restore; 1746b288052eSChris Mason 1747f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 17480d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 17490d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 17500d2450abSSergei Trofimovich 17511751e8a6SLinus Torvalds if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1752dc81cdc5SMiao Xie goto out; 1753c146afadSYan Zheng 17541751e8a6SLinus Torvalds if (*flags & SB_RDONLY) { 17558dabb742SStefan Behrens /* 17568dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 17578dabb742SStefan Behrens * the filesystem is busy. 17588dabb742SStefan Behrens */ 175921c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 1760361c093dSStefan Behrens 1761361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1762361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1763361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1764361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1765361c093dSStefan Behrens 17661751e8a6SLinus Torvalds sb->s_flags |= SB_RDONLY; 1767c146afadSYan Zheng 1768e44163e1SJeff Mahoney /* 17691751e8a6SLinus Torvalds * Setting SB_RDONLY will put the cleaner thread to 1770e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1771e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1772e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1773e44163e1SJeff Mahoney * unless we clean them up here. 1774e44163e1SJeff Mahoney */ 1775e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1776e44163e1SJeff Mahoney 17778dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 17788dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1779061594efSMiao Xie btrfs_pause_balance(fs_info); 17808dabb742SStefan Behrens 17816bccf3abSJeff Mahoney ret = btrfs_commit_super(fs_info); 178249b25e05SJeff Mahoney if (ret) 178349b25e05SJeff Mahoney goto restore; 1784c146afadSYan Zheng } else { 17850b246afaSJeff Mahoney if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 17866ef3de9cSDavid Sterba btrfs_err(fs_info, 1787efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 17886ef3de9cSDavid Sterba ret = -EINVAL; 17896ef3de9cSDavid Sterba goto restore; 17906ef3de9cSDavid Sterba } 17918a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 179249b25e05SJeff Mahoney ret = -EACCES; 179349b25e05SJeff Mahoney goto restore; 17948a3db184SSergei Trofimovich } 17952b82032cSYan Zheng 17966528b99dSAnand Jain if (!btrfs_check_rw_degradable(fs_info, NULL)) { 1797efe120a0SFrank Holton btrfs_warn(fs_info, 179852042d8eSAndrea Gelmini "too many missing devices, writable remount is not allowed"); 1799292fd7fcSStefan Behrens ret = -EACCES; 1800292fd7fcSStefan Behrens goto restore; 1801292fd7fcSStefan Behrens } 1802292fd7fcSStefan Behrens 18038a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 180449b25e05SJeff Mahoney ret = -EINVAL; 180549b25e05SJeff Mahoney goto restore; 18068a3db184SSergei Trofimovich } 1807c146afadSYan Zheng 1808815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 180949b25e05SJeff Mahoney if (ret) 181049b25e05SJeff Mahoney goto restore; 1811c146afadSYan Zheng 1812d68fc57bSYan, Zheng /* recover relocation */ 18135f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 1814d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 18155f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 181649b25e05SJeff Mahoney if (ret) 181749b25e05SJeff Mahoney goto restore; 1818c146afadSYan Zheng 18192b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 18202b6ba629SIlya Dryomov if (ret) 18212b6ba629SIlya Dryomov goto restore; 18222b6ba629SIlya Dryomov 18238dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 18248dabb742SStefan Behrens if (ret) { 1825efe120a0SFrank Holton btrfs_warn(fs_info, "failed to resume dev_replace"); 18268dabb742SStefan Behrens goto restore; 18278dabb742SStefan Behrens } 182894aebfb2SJosef Bacik 18296c6b5a39SAleksa Sarai btrfs_qgroup_rescan_resume(fs_info); 18306c6b5a39SAleksa Sarai 183194aebfb2SJosef Bacik if (!fs_info->uuid_root) { 1832efe120a0SFrank Holton btrfs_info(fs_info, "creating UUID tree"); 183394aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 183494aebfb2SJosef Bacik if (ret) { 18355d163e0eSJeff Mahoney btrfs_warn(fs_info, 18365d163e0eSJeff Mahoney "failed to create the UUID tree %d", 18375d163e0eSJeff Mahoney ret); 183894aebfb2SJosef Bacik goto restore; 183994aebfb2SJosef Bacik } 184094aebfb2SJosef Bacik } 18411751e8a6SLinus Torvalds sb->s_flags &= ~SB_RDONLY; 184290c711abSZygo Blaxell 1843afcdd129SJosef Bacik set_bit(BTRFS_FS_OPEN, &fs_info->flags); 1844c146afadSYan Zheng } 1845dc81cdc5SMiao Xie out: 18462c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 1847dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1848c146afadSYan Zheng return 0; 184949b25e05SJeff Mahoney 185049b25e05SJeff Mahoney restore: 18511751e8a6SLinus Torvalds /* We've hit an error - don't reset SB_RDONLY */ 1852bc98a42cSDavid Howells if (sb_rdonly(sb)) 18531751e8a6SLinus Torvalds old_flags |= SB_RDONLY; 185449b25e05SJeff Mahoney sb->s_flags = old_flags; 185549b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 185649b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 185749b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 18580d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 18590d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 186049b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1861dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 186249b25e05SJeff Mahoney return ret; 1863c146afadSYan Zheng } 1864c146afadSYan Zheng 1865bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 18667e17916bSArnd Bergmann static inline int btrfs_cmp_device_free_bytes(const void *dev_info1, 1867bcd53741SArne Jansen const void *dev_info2) 1868bcd53741SArne Jansen { 1869bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1870bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1871bcd53741SArne Jansen return -1; 1872bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1873bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1874bcd53741SArne Jansen return 1; 1875bcd53741SArne Jansen else 1876bcd53741SArne Jansen return 0; 1877bcd53741SArne Jansen } 1878bcd53741SArne Jansen 1879bcd53741SArne Jansen /* 1880bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1881bcd53741SArne Jansen * is stored.(Descending Sort) 1882bcd53741SArne Jansen */ 1883bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1884bcd53741SArne Jansen struct btrfs_device_info *devices, 1885bcd53741SArne Jansen size_t nr_devices) 1886bcd53741SArne Jansen { 1887bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1888bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1889bcd53741SArne Jansen } 1890bcd53741SArne Jansen 18916d07bcecSMiao Xie /* 18926d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 18936d07bcecSMiao Xie * file data. 18946d07bcecSMiao Xie */ 18957e17916bSArnd Bergmann static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, 18966bccf3abSJeff Mahoney u64 *free_bytes) 18976d07bcecSMiao Xie { 18986d07bcecSMiao Xie struct btrfs_device_info *devices_info; 18996d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 19006d07bcecSMiao Xie struct btrfs_device *device; 19016d07bcecSMiao Xie u64 skip_space; 19026d07bcecSMiao Xie u64 type; 19036d07bcecSMiao Xie u64 avail_space; 19046d07bcecSMiao Xie u64 min_stripe_size; 190539fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 19066d07bcecSMiao Xie int i = 0, nr_devices; 19076d07bcecSMiao Xie 19087e33fd99SJosef Bacik /* 190901327610SNicholas D Steeves * We aren't under the device list lock, so this is racy-ish, but good 19107e33fd99SJosef Bacik * enough for our purposes. 19117e33fd99SJosef Bacik */ 1912b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 19137e33fd99SJosef Bacik if (!nr_devices) { 19147e33fd99SJosef Bacik smp_mb(); 19157e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 19167e33fd99SJosef Bacik ASSERT(nr_devices); 19177e33fd99SJosef Bacik if (!nr_devices) { 19187e33fd99SJosef Bacik *free_bytes = 0; 19197e33fd99SJosef Bacik return 0; 19207e33fd99SJosef Bacik } 19217e33fd99SJosef Bacik } 19226d07bcecSMiao Xie 1923d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 19246a44517dSDavid Sterba GFP_KERNEL); 19256d07bcecSMiao Xie if (!devices_info) 19266d07bcecSMiao Xie return -ENOMEM; 19276d07bcecSMiao Xie 192801327610SNicholas D Steeves /* calc min stripe number for data space allocation */ 19291b86826dSJeff Mahoney type = btrfs_data_alloc_profile(fs_info); 193039fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 19316d07bcecSMiao Xie min_stripes = 2; 193239fb26c3SMiao Xie num_stripes = nr_devices; 193339fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 19346d07bcecSMiao Xie min_stripes = 2; 193539fb26c3SMiao Xie num_stripes = 2; 193639fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 19376d07bcecSMiao Xie min_stripes = 4; 193839fb26c3SMiao Xie num_stripes = 4; 193939fb26c3SMiao Xie } 19406d07bcecSMiao Xie 19416d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 19426d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 19436d07bcecSMiao Xie else 19446d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 19456d07bcecSMiao Xie 19467e33fd99SJosef Bacik rcu_read_lock(); 19477e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 1948e12c9621SAnand Jain if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, 1949e12c9621SAnand Jain &device->dev_state) || 1950401e29c1SAnand Jain !device->bdev || 1951401e29c1SAnand Jain test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) 19526d07bcecSMiao Xie continue; 19536d07bcecSMiao Xie 19547e33fd99SJosef Bacik if (i >= nr_devices) 19557e33fd99SJosef Bacik break; 19567e33fd99SJosef Bacik 19576d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 19586d07bcecSMiao Xie 19596d07bcecSMiao Xie /* align with stripe_len */ 1960f8c269d7SDavid Sterba avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); 19616d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 19626d07bcecSMiao Xie 19636d07bcecSMiao Xie /* 196401327610SNicholas D Steeves * In order to avoid overwriting the superblock on the drive, 19656d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 19666d07bcecSMiao Xie * allocation. 19676d07bcecSMiao Xie */ 1968ee22184bSByongho Lee skip_space = SZ_1M; 19696d07bcecSMiao Xie 19706d07bcecSMiao Xie /* 19716d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 19726d07bcecSMiao Xie * it from the total. 19736d07bcecSMiao Xie */ 19746d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 19756d07bcecSMiao Xie avail_space -= skip_space; 19766d07bcecSMiao Xie else 19776d07bcecSMiao Xie avail_space = 0; 19786d07bcecSMiao Xie 19796d07bcecSMiao Xie if (avail_space < min_stripe_size) 19806d07bcecSMiao Xie continue; 19816d07bcecSMiao Xie 19826d07bcecSMiao Xie devices_info[i].dev = device; 19836d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 19846d07bcecSMiao Xie 19856d07bcecSMiao Xie i++; 19866d07bcecSMiao Xie } 19877e33fd99SJosef Bacik rcu_read_unlock(); 19886d07bcecSMiao Xie 19896d07bcecSMiao Xie nr_devices = i; 19906d07bcecSMiao Xie 19916d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 19926d07bcecSMiao Xie 19936d07bcecSMiao Xie i = nr_devices - 1; 19946d07bcecSMiao Xie avail_space = 0; 19956d07bcecSMiao Xie while (nr_devices >= min_stripes) { 199639fb26c3SMiao Xie if (num_stripes > nr_devices) 199739fb26c3SMiao Xie num_stripes = nr_devices; 199839fb26c3SMiao Xie 19996d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 20006d07bcecSMiao Xie int j; 20016d07bcecSMiao Xie u64 alloc_size; 20026d07bcecSMiao Xie 200339fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 20046d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 200539fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 20066d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 20076d07bcecSMiao Xie } 20086d07bcecSMiao Xie i--; 20096d07bcecSMiao Xie nr_devices--; 20106d07bcecSMiao Xie } 20116d07bcecSMiao Xie 20126d07bcecSMiao Xie kfree(devices_info); 20136d07bcecSMiao Xie *free_bytes = avail_space; 20146d07bcecSMiao Xie return 0; 20156d07bcecSMiao Xie } 20166d07bcecSMiao Xie 2017ba7b6e62SDavid Sterba /* 2018ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2019ba7b6e62SDavid Sterba * 2020ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2021ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2022ba7b6e62SDavid Sterba * 2023ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 20240d0c71b3SDavid Sterba * algorithm that respects the device sizes and order of allocations. This is 20250d0c71b3SDavid Sterba * a close approximation of the actual use but there are other factors that may 20260d0c71b3SDavid Sterba * change the result (like a new metadata chunk). 2027ba7b6e62SDavid Sterba * 2028ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2029ba7b6e62SDavid Sterba */ 20308fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 20318fd17795SChris Mason { 2032815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2033815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2034815745cfSAl Viro struct list_head *head = &fs_info->space_info; 2035bd4d1088SJosef Bacik struct btrfs_space_info *found; 2036bd4d1088SJosef Bacik u64 total_used = 0; 20376d07bcecSMiao Xie u64 total_free_data = 0; 2038ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2039db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 2040de37aa51SNikolay Borisov __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid; 2041ba7b6e62SDavid Sterba unsigned factor = 1; 2042ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 20436d07bcecSMiao Xie int ret; 2044ca8a51b3SDavid Sterba u64 thresh = 0; 2045ae02d1bdSLuis de Bethencourt int mixed = 0; 20468fd17795SChris Mason 2047bd4d1088SJosef Bacik rcu_read_lock(); 204889a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 20496d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2050ba7b6e62SDavid Sterba int i; 2051ba7b6e62SDavid Sterba 20526d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 20536d07bcecSMiao Xie total_free_data -= 20546d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2055ba7b6e62SDavid Sterba 2056ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 205746df06b8SDavid Sterba if (!list_empty(&found->block_groups[i])) 205846df06b8SDavid Sterba factor = btrfs_bg_type_to_factor( 205946df06b8SDavid Sterba btrfs_raid_array[i].bg_flag); 2060ba7b6e62SDavid Sterba } 20616d07bcecSMiao Xie } 2062ae02d1bdSLuis de Bethencourt 2063ae02d1bdSLuis de Bethencourt /* 2064ae02d1bdSLuis de Bethencourt * Metadata in mixed block goup profiles are accounted in data 2065ae02d1bdSLuis de Bethencourt */ 2066ae02d1bdSLuis de Bethencourt if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { 2067ae02d1bdSLuis de Bethencourt if (found->flags & BTRFS_BLOCK_GROUP_DATA) 2068ae02d1bdSLuis de Bethencourt mixed = 1; 2069ae02d1bdSLuis de Bethencourt else 2070ae02d1bdSLuis de Bethencourt total_free_meta += found->disk_total - 2071ae02d1bdSLuis de Bethencourt found->disk_used; 2072ae02d1bdSLuis de Bethencourt } 20736d07bcecSMiao Xie 2074b742bb82SYan, Zheng total_used += found->disk_used; 207589a55897SJosef Bacik } 2076ba7b6e62SDavid Sterba 2077bd4d1088SJosef Bacik rcu_read_unlock(); 2078bd4d1088SJosef Bacik 2079ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2080ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2081ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2082ba7b6e62SDavid Sterba 2083ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2084ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 208541b34accSLuis de Bethencourt /* Mixed block groups accounting is not byte-accurate, avoid overflow */ 208641b34accSLuis de Bethencourt if (buf->f_bfree >= block_rsv->size >> bits) 2087ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 208841b34accSLuis de Bethencourt else 208941b34accSLuis de Bethencourt buf->f_bfree = 0; 2090ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2091ba7b6e62SDavid Sterba 20920d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 20936bccf3abSJeff Mahoney ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); 20947e33fd99SJosef Bacik if (ret) 20956d07bcecSMiao Xie return ret; 2096ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 20976d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2098d397712bSChris Mason 2099ca8a51b3SDavid Sterba /* 2100ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2101ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2102ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2103ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2104ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2105ca8a51b3SDavid Sterba * 2106ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2107ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2108ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2109ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2110ca8a51b3SDavid Sterba * way around. 2111ca8a51b3SDavid Sterba */ 2112d4417e22SNikolay Borisov thresh = SZ_4M; 2113ca8a51b3SDavid Sterba 2114ae02d1bdSLuis de Bethencourt if (!mixed && total_free_meta - thresh < block_rsv->size) 2115ca8a51b3SDavid Sterba buf->f_bavail = 0; 2116ca8a51b3SDavid Sterba 2117ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2118ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2119ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2120ba7b6e62SDavid Sterba 21219d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 21229d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 21239d03632eSDavid Woodhouse on a big-endian or little-endian host */ 21249d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 21259d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 212632d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 21274fd786e6SMisono Tomohiro buf->f_fsid.val[0] ^= 21284fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32; 21294fd786e6SMisono Tomohiro buf->f_fsid.val[1] ^= 21304fd786e6SMisono Tomohiro BTRFS_I(d_inode(dentry))->root->root_key.objectid; 213132d48fa1SDavid Woodhouse 21328fd17795SChris Mason return 0; 21338fd17795SChris Mason } 2134b5133862SChris Mason 2135aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2136aea52e19SAl Viro { 2137815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2138aea52e19SAl Viro kill_anon_super(sb); 2139aea52e19SAl Viro free_fs_info(fs_info); 2140aea52e19SAl Viro } 2141aea52e19SAl Viro 21422e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 21432e635a27SChris Mason .owner = THIS_MODULE, 21442e635a27SChris Mason .name = "btrfs", 2145061dbc6bSAl Viro .mount = btrfs_mount, 2146aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2147f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 21482e635a27SChris Mason }; 214972fa39f5SMisono, Tomohiro 215072fa39f5SMisono, Tomohiro static struct file_system_type btrfs_root_fs_type = { 215172fa39f5SMisono, Tomohiro .owner = THIS_MODULE, 215272fa39f5SMisono, Tomohiro .name = "btrfs", 215372fa39f5SMisono, Tomohiro .mount = btrfs_mount_root, 215472fa39f5SMisono, Tomohiro .kill_sb = btrfs_kill_super, 215572fa39f5SMisono, Tomohiro .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 215672fa39f5SMisono, Tomohiro }; 215772fa39f5SMisono, Tomohiro 21587f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2159a9218f6bSChris Mason 2160d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2161d8620958STom Van Braeckel { 2162d8620958STom Van Braeckel /* 2163d8620958STom Van Braeckel * The control file's private_data is used to hold the 2164d8620958STom Van Braeckel * transaction when it is started and is used to keep 2165d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2166d8620958STom Van Braeckel */ 2167d8620958STom Van Braeckel file->private_data = NULL; 2168d8620958STom Van Braeckel return 0; 2169d8620958STom Van Braeckel } 2170d8620958STom Van Braeckel 2171d352ac68SChris Mason /* 2172d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 2173d352ac68SChris Mason */ 21748a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 21758a4b83ccSChris Mason unsigned long arg) 21768a4b83ccSChris Mason { 21778a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 217836350e95SGu Jinxiang struct btrfs_device *device = NULL; 2179c071fcfdSChris Mason int ret = -ENOTTY; 21808a4b83ccSChris Mason 2181e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2182e441d54dSChris Mason return -EPERM; 2183e441d54dSChris Mason 2184dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2185dae7b665SLi Zefan if (IS_ERR(vol)) 2186dae7b665SLi Zefan return PTR_ERR(vol); 2187f505754fSFilipe Manana vol->name[BTRFS_PATH_NAME_MAX] = '\0'; 2188c071fcfdSChris Mason 21898a4b83ccSChris Mason switch (cmd) { 21908a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 2191899f9307SDavid Sterba mutex_lock(&uuid_mutex); 219236350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 219336350e95SGu Jinxiang &btrfs_root_fs_type); 219436350e95SGu Jinxiang ret = PTR_ERR_OR_ZERO(device); 2195899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 21968a4b83ccSChris Mason break; 2197228a73abSAnand Jain case BTRFS_IOC_FORGET_DEV: 2198228a73abSAnand Jain ret = btrfs_forget_devices(vol->name); 2199228a73abSAnand Jain break; 220002db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 2201899f9307SDavid Sterba mutex_lock(&uuid_mutex); 220236350e95SGu Jinxiang device = btrfs_scan_one_device(vol->name, FMODE_READ, 220336350e95SGu Jinxiang &btrfs_root_fs_type); 220436350e95SGu Jinxiang if (IS_ERR(device)) { 2205899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 220636350e95SGu Jinxiang ret = PTR_ERR(device); 220702db0844SJosef Bacik break; 2208899f9307SDavid Sterba } 220936350e95SGu Jinxiang ret = !(device->fs_devices->num_devices == 221036350e95SGu Jinxiang device->fs_devices->total_devices); 2211899f9307SDavid Sterba mutex_unlock(&uuid_mutex); 221202db0844SJosef Bacik break; 2213c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2214d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2215c5868f83SDavid Sterba break; 22168a4b83ccSChris Mason } 2217dae7b665SLi Zefan 22188a4b83ccSChris Mason kfree(vol); 2219f819d837SLinda Knippers return ret; 22208a4b83ccSChris Mason } 22218a4b83ccSChris Mason 22220176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2223ed0dab6bSYan { 2224354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 22250b246afaSJeff Mahoney struct btrfs_fs_info *fs_info = btrfs_sb(sb); 22260b246afaSJeff Mahoney struct btrfs_root *root = fs_info->tree_root; 2227354aa0fbSMiao Xie 2228fac03c8dSDavid Sterba set_bit(BTRFS_FS_FROZEN, &fs_info->flags); 22299e7cc91aSWang Xiaoguang /* 22309e7cc91aSWang Xiaoguang * We don't need a barrier here, we'll wait for any transaction that 22319e7cc91aSWang Xiaoguang * could be in progress on other threads (and do delayed iputs that 22329e7cc91aSWang Xiaoguang * we want to avoid on a frozen filesystem), or do the commit 22339e7cc91aSWang Xiaoguang * ourselves. 22349e7cc91aSWang Xiaoguang */ 2235d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2236354aa0fbSMiao Xie if (IS_ERR(trans)) { 2237354aa0fbSMiao Xie /* no transaction, don't bother */ 2238354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 22390176260fSLinus Torvalds return 0; 2240354aa0fbSMiao Xie return PTR_ERR(trans); 2241354aa0fbSMiao Xie } 22423a45bb20SJeff Mahoney return btrfs_commit_transaction(trans); 2243ed0dab6bSYan } 2244ed0dab6bSYan 22459e7cc91aSWang Xiaoguang static int btrfs_unfreeze(struct super_block *sb) 22469e7cc91aSWang Xiaoguang { 2247fac03c8dSDavid Sterba struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2248fac03c8dSDavid Sterba 2249fac03c8dSDavid Sterba clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); 22509e7cc91aSWang Xiaoguang return 0; 22519e7cc91aSWang Xiaoguang } 22529e7cc91aSWang Xiaoguang 22539c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 22549c5085c1SJosef Bacik { 22559c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 22569c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 22579c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 22589c5085c1SJosef Bacik struct list_head *head; 22599c5085c1SJosef Bacik 226088c14590SDavid Sterba /* 226188c14590SDavid Sterba * Lightweight locking of the devices. We should not need 226288c14590SDavid Sterba * device_list_mutex here as we only read the device data and the list 226388c14590SDavid Sterba * is protected by RCU. Even if a device is deleted during the list 226488c14590SDavid Sterba * traversals, we'll get valid data, the freeing callback will wait at 226552042d8eSAndrea Gelmini * least until the rcu_read_unlock. 226688c14590SDavid Sterba */ 226788c14590SDavid Sterba rcu_read_lock(); 22689c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 22699c5085c1SJosef Bacik while (cur_devices) { 22709c5085c1SJosef Bacik head = &cur_devices->devices; 227188c14590SDavid Sterba list_for_each_entry_rcu(dev, head, dev_list) { 2272e6e674bdSAnand Jain if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) 2273aa9ddcd4SJosef Bacik continue; 22740aeb8a6eSAnand Jain if (!dev->name) 22750aeb8a6eSAnand Jain continue; 22769c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 22779c5085c1SJosef Bacik first_dev = dev; 22789c5085c1SJosef Bacik } 22799c5085c1SJosef Bacik cur_devices = cur_devices->seed; 22809c5085c1SJosef Bacik } 22819c5085c1SJosef Bacik 2282672d5990SMisono Tomohiro if (first_dev) 2283672d5990SMisono Tomohiro seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\"); 2284672d5990SMisono Tomohiro else 22859c5085c1SJosef Bacik WARN_ON(1); 228688c14590SDavid Sterba rcu_read_unlock(); 22879c5085c1SJosef Bacik return 0; 22889c5085c1SJosef Bacik } 22899c5085c1SJosef Bacik 2290b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 229176dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2292bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2293e20d96d6SChris Mason .put_super = btrfs_put_super, 2294d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2295a9572a15SEric Paris .show_options = btrfs_show_options, 22969c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 22972c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 22982c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 229926602cabSAl Viro .free_inode = btrfs_free_inode, 23008fd17795SChris Mason .statfs = btrfs_statfs, 2301c146afadSYan Zheng .remount_fs = btrfs_remount, 23020176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 23039e7cc91aSWang Xiaoguang .unfreeze_fs = btrfs_unfreeze, 2304e20d96d6SChris Mason }; 2305a9218f6bSChris Mason 2306a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2307d8620958STom Van Braeckel .open = btrfs_control_open, 2308a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 2309a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 2310a9218f6bSChris Mason .owner = THIS_MODULE, 23116038f373SArnd Bergmann .llseek = noop_llseek, 2312a9218f6bSChris Mason }; 2313a9218f6bSChris Mason 2314a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2315578454ffSKay Sievers .minor = BTRFS_MINOR, 2316a9218f6bSChris Mason .name = "btrfs-control", 2317a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2318a9218f6bSChris Mason }; 2319a9218f6bSChris Mason 2320578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2321578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2322578454ffSKay Sievers 2323f5c29bd9SLiu Bo static int __init btrfs_interface_init(void) 2324a9218f6bSChris Mason { 2325a9218f6bSChris Mason return misc_register(&btrfs_misc); 2326a9218f6bSChris Mason } 2327a9218f6bSChris Mason 2328e67c718bSDavid Sterba static __cold void btrfs_interface_exit(void) 2329a9218f6bSChris Mason { 2330f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2331a9218f6bSChris Mason } 2332a9218f6bSChris Mason 2333f5c29bd9SLiu Bo static void __init btrfs_print_mod_info(void) 233485965600SDavid Sterba { 2335edf57cbfSBart Van Assche static const char options[] = "" 233685965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 233785965600SDavid Sterba ", debug=on" 233885965600SDavid Sterba #endif 233979556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 234079556c3dSStefan Behrens ", assert=on" 234179556c3dSStefan Behrens #endif 234285965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 234385965600SDavid Sterba ", integrity-checker=on" 234485965600SDavid Sterba #endif 2345fb592373SJosef Bacik #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2346fb592373SJosef Bacik ", ref-verify=on" 2347fb592373SJosef Bacik #endif 2348edf57cbfSBart Van Assche ; 2349edf57cbfSBart Van Assche pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); 235085965600SDavid Sterba } 235185965600SDavid Sterba 23522e635a27SChris Mason static int __init init_btrfs_fs(void) 23532e635a27SChris Mason { 23542c90e5d6SChris Mason int err; 235558176a96SJosef Bacik 235663541927SFilipe David Borba Manana btrfs_props_init(); 235763541927SFilipe David Borba Manana 235858176a96SJosef Bacik err = btrfs_init_sysfs(); 235958176a96SJosef Bacik if (err) 23609678c543SNikolay Borisov return err; 236158176a96SJosef Bacik 2362143bede5SJeff Mahoney btrfs_init_compress(); 2363d1310b2eSChris Mason 2364261507a0SLi Zefan err = btrfs_init_cachep(); 2365261507a0SLi Zefan if (err) 2366261507a0SLi Zefan goto free_compress; 2367261507a0SLi Zefan 2368d1310b2eSChris Mason err = extent_io_init(); 23692f4cbe64SWyatt Banks if (err) 23702f4cbe64SWyatt Banks goto free_cachep; 23712f4cbe64SWyatt Banks 2372d1310b2eSChris Mason err = extent_map_init(); 2373d1310b2eSChris Mason if (err) 2374d1310b2eSChris Mason goto free_extent_io; 2375d1310b2eSChris Mason 23766352b91dSMiao Xie err = ordered_data_init(); 23772f4cbe64SWyatt Banks if (err) 23782f4cbe64SWyatt Banks goto free_extent_map; 2379c8b97818SChris Mason 23806352b91dSMiao Xie err = btrfs_delayed_inode_init(); 23816352b91dSMiao Xie if (err) 23826352b91dSMiao Xie goto free_ordered_data; 23836352b91dSMiao Xie 23849247f317SMiao Xie err = btrfs_auto_defrag_init(); 238516cdcec7SMiao Xie if (err) 238616cdcec7SMiao Xie goto free_delayed_inode; 238716cdcec7SMiao Xie 238878a6184aSMiao Xie err = btrfs_delayed_ref_init(); 23899247f317SMiao Xie if (err) 23909247f317SMiao Xie goto free_auto_defrag; 23919247f317SMiao Xie 2392b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2393b9e9a6cbSWang Shilong if (err) 2394af13b492SDavid Sterba goto free_delayed_ref; 2395b9e9a6cbSWang Shilong 239697eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 239778a6184aSMiao Xie if (err) 2398af13b492SDavid Sterba goto free_prelim_ref; 239978a6184aSMiao Xie 240097eb6b69SDavid Sterba err = btrfs_interface_init(); 240197eb6b69SDavid Sterba if (err) 240297eb6b69SDavid Sterba goto free_end_io_wq; 240397eb6b69SDavid Sterba 2404e565d4b9SJan Schmidt btrfs_init_lockdep(); 2405e565d4b9SJan Schmidt 24068ae1af3cSAnand Jain btrfs_print_mod_info(); 2407dc11dd5dSJosef Bacik 2408dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2409dc11dd5dSJosef Bacik if (err) 2410dc11dd5dSJosef Bacik goto unregister_ioctl; 2411dc11dd5dSJosef Bacik 2412dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2413dc11dd5dSJosef Bacik if (err) 2414dc11dd5dSJosef Bacik goto unregister_ioctl; 241574255aa0SJosef Bacik 24162f4cbe64SWyatt Banks return 0; 24172f4cbe64SWyatt Banks 2418a9218f6bSChris Mason unregister_ioctl: 2419a9218f6bSChris Mason btrfs_interface_exit(); 242097eb6b69SDavid Sterba free_end_io_wq: 242197eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2422b9e9a6cbSWang Shilong free_prelim_ref: 2423b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 242478a6184aSMiao Xie free_delayed_ref: 242578a6184aSMiao Xie btrfs_delayed_ref_exit(); 24269247f317SMiao Xie free_auto_defrag: 24279247f317SMiao Xie btrfs_auto_defrag_exit(); 242816cdcec7SMiao Xie free_delayed_inode: 242916cdcec7SMiao Xie btrfs_delayed_inode_exit(); 24306352b91dSMiao Xie free_ordered_data: 24316352b91dSMiao Xie ordered_data_exit(); 24322f4cbe64SWyatt Banks free_extent_map: 24332f4cbe64SWyatt Banks extent_map_exit(); 2434d1310b2eSChris Mason free_extent_io: 2435d1310b2eSChris Mason extent_io_exit(); 24362f4cbe64SWyatt Banks free_cachep: 24372f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2438261507a0SLi Zefan free_compress: 2439261507a0SLi Zefan btrfs_exit_compress(); 24402f4cbe64SWyatt Banks btrfs_exit_sysfs(); 24419678c543SNikolay Borisov 24422c90e5d6SChris Mason return err; 24432e635a27SChris Mason } 24442e635a27SChris Mason 24452e635a27SChris Mason static void __exit exit_btrfs_fs(void) 24462e635a27SChris Mason { 244739279cc3SChris Mason btrfs_destroy_cachep(); 244878a6184aSMiao Xie btrfs_delayed_ref_exit(); 24499247f317SMiao Xie btrfs_auto_defrag_exit(); 245016cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2451b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 24526352b91dSMiao Xie ordered_data_exit(); 2453a52d9a80SChris Mason extent_map_exit(); 2454d1310b2eSChris Mason extent_io_exit(); 2455a9218f6bSChris Mason btrfs_interface_exit(); 24565ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 24572e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 245858176a96SJosef Bacik btrfs_exit_sysfs(); 24598a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2460261507a0SLi Zefan btrfs_exit_compress(); 24612e635a27SChris Mason } 24622e635a27SChris Mason 246360efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 24642e635a27SChris Mason module_exit(exit_btrfs_fs) 24652e635a27SChris Mason 24662e635a27SChris Mason MODULE_LICENSE("GPL"); 2467*d5178578SJohannes Thumshirn MODULE_SOFTDEP("pre: crc32c"); 2468