16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 194b82d6e4SYan #include <linux/blkdev.h> 202e635a27SChris Mason #include <linux/module.h> 21e20d96d6SChris Mason #include <linux/buffer_head.h> 222e635a27SChris Mason #include <linux/fs.h> 232e635a27SChris Mason #include <linux/pagemap.h> 242e635a27SChris Mason #include <linux/highmem.h> 252e635a27SChris Mason #include <linux/time.h> 262e635a27SChris Mason #include <linux/init.h> 27a9572a15SEric Paris #include <linux/seq_file.h> 282e635a27SChris Mason #include <linux/string.h> 292e635a27SChris Mason #include <linux/backing-dev.h> 304b82d6e4SYan #include <linux/mount.h> 31dee26a9fSChris Mason #include <linux/mpage.h> 3275dfe396SChris Mason #include <linux/swap.h> 3375dfe396SChris Mason #include <linux/writeback.h> 348fd17795SChris Mason #include <linux/statfs.h> 3508607c1bSChris Mason #include <linux/compat.h> 3695e05289SChris Mason #include <linux/parser.h> 37c59f8951SChris Mason #include <linux/ctype.h> 386da6abaeSChris Mason #include <linux/namei.h> 39a9218f6bSChris Mason #include <linux/miscdevice.h> 401bcbf313SQinghuang Feng #include <linux/magic.h> 415a0e3ad6STejun Heo #include <linux/slab.h> 4290a887c9SDan Magenheimer #include <linux/cleancache.h> 4322c44fe6SJosef Bacik #include <linux/ratelimit.h> 4455e301fdSFilipe Brandenburger #include <linux/btrfs.h> 4516cdcec7SMiao Xie #include "delayed-inode.h" 462e635a27SChris Mason #include "ctree.h" 47e20d96d6SChris Mason #include "disk-io.h" 48d5719762SChris Mason #include "transaction.h" 492c90e5d6SChris Mason #include "btrfs_inode.h" 503a686375SChris Mason #include "print-tree.h" 5114a958e6SFilipe David Borba Manana #include "hash.h" 5263541927SFilipe David Borba Manana #include "props.h" 535103e947SJosef Bacik #include "xattr.h" 548a4b83ccSChris Mason #include "volumes.h" 55be6e8dc0SBalaji Rao #include "export.h" 56c8b97818SChris Mason #include "compression.h" 579c5085c1SJosef Bacik #include "rcu-string.h" 588dabb742SStefan Behrens #include "dev-replace.h" 5974255aa0SJosef Bacik #include "free-space-cache.h" 60b9e9a6cbSWang Shilong #include "backref.h" 61dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 622e635a27SChris Mason 63d3982100SMark Fasheh #include "qgroup.h" 641abe9b8aSliubo #define CREATE_TRACE_POINTS 651abe9b8aSliubo #include <trace/events/btrfs.h> 661abe9b8aSliubo 67b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 68830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 69e20d96d6SChris Mason 700723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 710723a047SHarald Hoyer 7208748810SDavid Sterba static const char *btrfs_decode_error(int errno) 73acce952bSliubo { 7408748810SDavid Sterba char *errstr = "unknown"; 75acce952bSliubo 76acce952bSliubo switch (errno) { 77acce952bSliubo case -EIO: 78acce952bSliubo errstr = "IO failure"; 79acce952bSliubo break; 80acce952bSliubo case -ENOMEM: 81acce952bSliubo errstr = "Out of memory"; 82acce952bSliubo break; 83acce952bSliubo case -EROFS: 84acce952bSliubo errstr = "Readonly filesystem"; 85acce952bSliubo break; 868c342930SJeff Mahoney case -EEXIST: 878c342930SJeff Mahoney errstr = "Object already exists"; 888c342930SJeff Mahoney break; 8994ef7280SDavid Sterba case -ENOSPC: 9094ef7280SDavid Sterba errstr = "No space left"; 9194ef7280SDavid Sterba break; 9294ef7280SDavid Sterba case -ENOENT: 9394ef7280SDavid Sterba errstr = "No such entry"; 9494ef7280SDavid Sterba break; 95acce952bSliubo } 96acce952bSliubo 97acce952bSliubo return errstr; 98acce952bSliubo } 99acce952bSliubo 100bbece8a3SDavid Sterba static void save_error_info(struct btrfs_fs_info *fs_info) 101acce952bSliubo { 102acce952bSliubo /* 103acce952bSliubo * today we only save the error info into ram. Long term we'll 104acce952bSliubo * also send it down to the disk 105acce952bSliubo */ 10687533c47SMiao Xie set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 107acce952bSliubo } 108acce952bSliubo 109acce952bSliubo /* btrfs handle error by forcing the filesystem readonly */ 110acce952bSliubo static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 111acce952bSliubo { 112acce952bSliubo struct super_block *sb = fs_info->sb; 113acce952bSliubo 114acce952bSliubo if (sb->s_flags & MS_RDONLY) 115acce952bSliubo return; 116acce952bSliubo 11787533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 118acce952bSliubo sb->s_flags |= MS_RDONLY; 119c2cf52ebSSimon Kirby btrfs_info(fs_info, "forced readonly"); 1201acd6831SStefan Behrens /* 1211acd6831SStefan Behrens * Note that a running device replace operation is not 1221acd6831SStefan Behrens * canceled here although there is no way to update 1231acd6831SStefan Behrens * the progress. It would add the risk of a deadlock, 1241acd6831SStefan Behrens * therefore the canceling is ommited. The only penalty 1251acd6831SStefan Behrens * is that some I/O remains active until the procedure 1261acd6831SStefan Behrens * completes. The next time when the filesystem is 1271acd6831SStefan Behrens * mounted writeable again, the device replace 1281acd6831SStefan Behrens * operation continues. 1291acd6831SStefan Behrens */ 130acce952bSliubo } 131acce952bSliubo } 132acce952bSliubo 133533574c6SJoe Perches #ifdef CONFIG_PRINTK 134acce952bSliubo /* 135acce952bSliubo * __btrfs_std_error decodes expected errors from the caller and 136acce952bSliubo * invokes the approciate error response. 137acce952bSliubo */ 138c0d19e2bSDavid Sterba __cold 139acce952bSliubo void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 1404da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 141acce952bSliubo { 142acce952bSliubo struct super_block *sb = fs_info->sb; 143acce952bSliubo const char *errstr; 144acce952bSliubo 145acce952bSliubo /* 146acce952bSliubo * Special case: if the error is EROFS, and we're already 147acce952bSliubo * under MS_RDONLY, then it is safe here. 148acce952bSliubo */ 149acce952bSliubo if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 150acce952bSliubo return; 151acce952bSliubo 15208748810SDavid Sterba errstr = btrfs_decode_error(errno); 1534da35113SJeff Mahoney if (fmt) { 15437252a66SEric Sandeen struct va_format vaf; 15537252a66SEric Sandeen va_list args; 15637252a66SEric Sandeen 15737252a66SEric Sandeen va_start(args, fmt); 15837252a66SEric Sandeen vaf.fmt = fmt; 15937252a66SEric Sandeen vaf.va = &args; 1604da35113SJeff Mahoney 161efe120a0SFrank Holton printk(KERN_CRIT 162efe120a0SFrank Holton "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 16308748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 16437252a66SEric Sandeen va_end(args); 1654da35113SJeff Mahoney } else { 166efe120a0SFrank Holton printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 16708748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1684da35113SJeff Mahoney } 169acce952bSliubo 1704da35113SJeff Mahoney /* Don't go through full error handling during mount */ 1714da35113SJeff Mahoney save_error_info(fs_info); 172cf79ffb5SJosef Bacik if (sb->s_flags & MS_BORN) 173acce952bSliubo btrfs_handle_error(fs_info); 174acce952bSliubo } 1754da35113SJeff Mahoney 176533574c6SJoe Perches static const char * const logtypes[] = { 1774da35113SJeff Mahoney "emergency", 1784da35113SJeff Mahoney "alert", 1794da35113SJeff Mahoney "critical", 1804da35113SJeff Mahoney "error", 1814da35113SJeff Mahoney "warning", 1824da35113SJeff Mahoney "notice", 1834da35113SJeff Mahoney "info", 1844da35113SJeff Mahoney "debug", 1854da35113SJeff Mahoney }; 1864da35113SJeff Mahoney 187c2cf52ebSSimon Kirby void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 1884da35113SJeff Mahoney { 1894da35113SJeff Mahoney struct super_block *sb = fs_info->sb; 1904da35113SJeff Mahoney char lvl[4]; 1914da35113SJeff Mahoney struct va_format vaf; 1924da35113SJeff Mahoney va_list args; 1934da35113SJeff Mahoney const char *type = logtypes[4]; 194533574c6SJoe Perches int kern_level; 1954da35113SJeff Mahoney 1964da35113SJeff Mahoney va_start(args, fmt); 1974da35113SJeff Mahoney 198533574c6SJoe Perches kern_level = printk_get_level(fmt); 199533574c6SJoe Perches if (kern_level) { 200533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 201533574c6SJoe Perches memcpy(lvl, fmt, size); 202533574c6SJoe Perches lvl[size] = '\0'; 203533574c6SJoe Perches fmt += size; 204533574c6SJoe Perches type = logtypes[kern_level - '0']; 2054da35113SJeff Mahoney } else 2064da35113SJeff Mahoney *lvl = '\0'; 2074da35113SJeff Mahoney 2084da35113SJeff Mahoney vaf.fmt = fmt; 2094da35113SJeff Mahoney vaf.va = &args; 210533574c6SJoe Perches 211c2cf52ebSSimon Kirby printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); 212533574c6SJoe Perches 213533574c6SJoe Perches va_end(args); 2144da35113SJeff Mahoney } 215acce952bSliubo 216533574c6SJoe Perches #else 217533574c6SJoe Perches 218533574c6SJoe Perches void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 219533574c6SJoe Perches unsigned int line, int errno, const char *fmt, ...) 220533574c6SJoe Perches { 221533574c6SJoe Perches struct super_block *sb = fs_info->sb; 222533574c6SJoe Perches 223533574c6SJoe Perches /* 224533574c6SJoe Perches * Special case: if the error is EROFS, and we're already 225533574c6SJoe Perches * under MS_RDONLY, then it is safe here. 226533574c6SJoe Perches */ 227533574c6SJoe Perches if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 228533574c6SJoe Perches return; 229533574c6SJoe Perches 230533574c6SJoe Perches /* Don't go through full error handling during mount */ 231533574c6SJoe Perches if (sb->s_flags & MS_BORN) { 232533574c6SJoe Perches save_error_info(fs_info); 233533574c6SJoe Perches btrfs_handle_error(fs_info); 234533574c6SJoe Perches } 235533574c6SJoe Perches } 236533574c6SJoe Perches #endif 237533574c6SJoe Perches 2388c342930SJeff Mahoney /* 23949b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 24049b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 24149b25e05SJeff Mahoney * one. 24249b25e05SJeff Mahoney * 24349b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 24449b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 24549b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 24649b25e05SJeff Mahoney * in the call path but will return -EIO. 24749b25e05SJeff Mahoney * 24849b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 24949b25e05SJeff Mahoney * btrfs_commit_transaction. 25049b25e05SJeff Mahoney */ 251c0d19e2bSDavid Sterba __cold 25249b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 25349b25e05SJeff Mahoney struct btrfs_root *root, const char *function, 25449b25e05SJeff Mahoney unsigned int line, int errno) 25549b25e05SJeff Mahoney { 25649b25e05SJeff Mahoney trans->aborted = errno; 25749b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 25849b25e05SJeff Mahoney * transaction may be able to continue. */ 259c92f6be3SFilipe Manana if (!trans->blocks_used && list_empty(&trans->new_bgs)) { 26069ce977aSMiao Xie const char *errstr; 26169ce977aSMiao Xie 26208748810SDavid Sterba errstr = btrfs_decode_error(errno); 263c2cf52ebSSimon Kirby btrfs_warn(root->fs_info, 264c2cf52ebSSimon Kirby "%s:%d: Aborting unused transaction(%s).", 26569ce977aSMiao Xie function, line, errstr); 26649b25e05SJeff Mahoney return; 26749b25e05SJeff Mahoney } 2688d25a086SMiao Xie ACCESS_ONCE(trans->transaction->aborted) = errno; 269501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 270501407aaSJosef Bacik wake_up(&root->fs_info->transaction_wait); 271501407aaSJosef Bacik wake_up(&root->fs_info->transaction_blocked_wait); 27249b25e05SJeff Mahoney __btrfs_std_error(root->fs_info, function, line, errno, NULL); 27349b25e05SJeff Mahoney } 27449b25e05SJeff Mahoney /* 2758c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2768c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2778c342930SJeff Mahoney */ 278c0d19e2bSDavid Sterba __cold 2798c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2808c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2818c342930SJeff Mahoney { 2828c342930SJeff Mahoney char *s_id = "<unknown>"; 2838c342930SJeff Mahoney const char *errstr; 2848c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2858c342930SJeff Mahoney va_list args; 2868c342930SJeff Mahoney 2878c342930SJeff Mahoney if (fs_info) 2888c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2898c342930SJeff Mahoney 2908c342930SJeff Mahoney va_start(args, fmt); 2918c342930SJeff Mahoney vaf.va = &args; 2928c342930SJeff Mahoney 29308748810SDavid Sterba errstr = btrfs_decode_error(errno); 294aa43a17cSEric Sandeen if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) 29508748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 29608748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 2978c342930SJeff Mahoney 298efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 299efe120a0SFrank Holton function, line, &vaf, errno, errstr); 3008c342930SJeff Mahoney va_end(args); 3018c342930SJeff Mahoney /* Caller calls BUG() */ 3028c342930SJeff Mahoney } 303e20d96d6SChris Mason 304e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 305e20d96d6SChris Mason { 3063abdbd78SDavid Sterba close_ctree(btrfs_sb(sb)->tree_root); 307e20d96d6SChris Mason } 3082e635a27SChris Mason 30995e05289SChris Mason enum { 31073f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 311287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 312287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 313261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 314261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 31591435650SChris Mason Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, 3169555c6c1SIlya Dryomov Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, 3179555c6c1SIlya Dryomov Opt_no_space_cache, Opt_recovery, Opt_skip_balance, 31821adbd5cSStefan Behrens Opt_check_integrity, Opt_check_integrity_including_extent_data, 319f420ee1eSStefan Behrens Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, 320e07a2adeSQu Wenruo Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, 321a258af7aSQu Wenruo Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, 3223818aea2SQu Wenruo Opt_datasum, Opt_treelog, Opt_noinode_cache, 3239555c6c1SIlya Dryomov Opt_err, 32495e05289SChris Mason }; 32595e05289SChris Mason 32695e05289SChris Mason static match_table_t tokens = { 327dfe25020SChris Mason {Opt_degraded, "degraded"}, 32895e05289SChris Mason {Opt_subvol, "subvol=%s"}, 3291493381fSWang Shilong {Opt_subvolid, "subvolid=%s"}, 33043e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 331b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 332d399167dSQu Wenruo {Opt_datasum, "datasum"}, 333be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 334a258af7aSQu Wenruo {Opt_datacow, "datacow"}, 33521ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 336842bef58SQu Wenruo {Opt_barrier, "barrier"}, 3376f568d35SChris Mason {Opt_max_inline, "max_inline=%s"}, 3388f662a76SChris Mason {Opt_alloc_start, "alloc_start=%s"}, 3394543df7eSChris Mason {Opt_thread_pool, "thread_pool=%d"}, 340c8b97818SChris Mason {Opt_compress, "compress"}, 341261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 342a555f810SChris Mason {Opt_compress_force, "compress-force"}, 343261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 344e18e4809SChris Mason {Opt_ssd, "ssd"}, 345451d7585SChris Mason {Opt_ssd_spread, "ssd_spread"}, 3463b30c22fSChris Mason {Opt_nossd, "nossd"}, 347bd0330adSQu Wenruo {Opt_acl, "acl"}, 34833268eafSJosef Bacik {Opt_noacl, "noacl"}, 3493a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 350a88998f2SQu Wenruo {Opt_treelog, "treelog"}, 351dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 3522c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 35397e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 354e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 355e07a2adeSQu Wenruo {Opt_nodiscard, "nodiscard"}, 3560af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 35788c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3584260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 35991435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 36053036293SQu Wenruo {Opt_noenospc_debug, "noenospc_debug"}, 361e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3624cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 363fc0ca9afSQu Wenruo {Opt_nodefrag, "noautodefrag"}, 3644b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3653818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 3668965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 367af31f5e5SChris Mason {Opt_recovery, "recovery"}, 3689555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 36921adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 37021adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 37121adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 372f420ee1eSStefan Behrens {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 3738c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 3748b87dc17SDavid Sterba {Opt_commit_interval, "commit=%d"}, 37533268eafSJosef Bacik {Opt_err, NULL}, 37695e05289SChris Mason }; 37795e05289SChris Mason 378edf24abeSChristoph Hellwig /* 379edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 380edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 38149b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 382edf24abeSChristoph Hellwig */ 383edf24abeSChristoph Hellwig int btrfs_parse_options(struct btrfs_root *root, char *options) 38495e05289SChris Mason { 385edf24abeSChristoph Hellwig struct btrfs_fs_info *info = root->fs_info; 38695e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 38773bc1876SJosef Bacik char *p, *num, *orig = NULL; 38873bc1876SJosef Bacik u64 cache_gen; 3894543df7eSChris Mason int intarg; 390a7a3f7caSSage Weil int ret = 0; 391261507a0SLi Zefan char *compress_type; 392261507a0SLi Zefan bool compress_force = false; 393b6cda9bcSChris Mason 3946c41761fSDavid Sterba cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 39573bc1876SJosef Bacik if (cache_gen) 39673bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 39773bc1876SJosef Bacik 39895e05289SChris Mason if (!options) 39973bc1876SJosef Bacik goto out; 40095e05289SChris Mason 401be20aa9dSChris Mason /* 402be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 403be20aa9dSChris Mason * gets called twice 404be20aa9dSChris Mason */ 405be20aa9dSChris Mason options = kstrdup(options, GFP_NOFS); 406be20aa9dSChris Mason if (!options) 407be20aa9dSChris Mason return -ENOMEM; 408be20aa9dSChris Mason 409da495eccSJosef Bacik orig = options; 410be20aa9dSChris Mason 41195e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 41295e05289SChris Mason int token; 41395e05289SChris Mason if (!*p) 41495e05289SChris Mason continue; 41595e05289SChris Mason 41695e05289SChris Mason token = match_token(p, tokens, args); 41795e05289SChris Mason switch (token) { 418dfe25020SChris Mason case Opt_degraded: 419efe120a0SFrank Holton btrfs_info(root->fs_info, "allowing degraded mounts"); 420dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 421dfe25020SChris Mason break; 42295e05289SChris Mason case Opt_subvol: 42373f73415SJosef Bacik case Opt_subvolid: 424e15d0542SXin Zhong case Opt_subvolrootid: 42543e570b0SChristoph Hellwig case Opt_device: 426edf24abeSChristoph Hellwig /* 42743e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 428edf24abeSChristoph Hellwig * and can be happily ignored here. 429edf24abeSChristoph Hellwig */ 43095e05289SChris Mason break; 431b6cda9bcSChris Mason case Opt_nodatasum: 43207802534SQu Wenruo btrfs_set_and_info(root, NODATASUM, 43307802534SQu Wenruo "setting nodatasum"); 434be20aa9dSChris Mason break; 435d399167dSQu Wenruo case Opt_datasum: 43607802534SQu Wenruo if (btrfs_test_opt(root, NODATASUM)) { 437d399167dSQu Wenruo if (btrfs_test_opt(root, NODATACOW)) 438d399167dSQu Wenruo btrfs_info(root->fs_info, "setting datasum, datacow enabled"); 439d399167dSQu Wenruo else 440d399167dSQu Wenruo btrfs_info(root->fs_info, "setting datasum"); 44107802534SQu Wenruo } 442d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 443d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 444d399167dSQu Wenruo break; 445be20aa9dSChris Mason case Opt_nodatacow: 44607802534SQu Wenruo if (!btrfs_test_opt(root, NODATACOW)) { 447bedb2ccaSAndrei Popa if (!btrfs_test_opt(root, COMPRESS) || 448bedb2ccaSAndrei Popa !btrfs_test_opt(root, FORCE_COMPRESS)) { 449efe120a0SFrank Holton btrfs_info(root->fs_info, 450efe120a0SFrank Holton "setting nodatacow, compression disabled"); 451bedb2ccaSAndrei Popa } else { 452efe120a0SFrank Holton btrfs_info(root->fs_info, "setting nodatacow"); 453bedb2ccaSAndrei Popa } 45407802534SQu Wenruo } 455bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 456bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 457be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 458be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 459b6cda9bcSChris Mason break; 460a258af7aSQu Wenruo case Opt_datacow: 46107802534SQu Wenruo btrfs_clear_and_info(root, NODATACOW, 46207802534SQu Wenruo "setting datacow"); 463a258af7aSQu Wenruo break; 464a555f810SChris Mason case Opt_compress_force: 465261507a0SLi Zefan case Opt_compress_force_type: 466261507a0SLi Zefan compress_force = true; 4671c697d4aSEric Sandeen /* Fallthrough */ 468261507a0SLi Zefan case Opt_compress: 469261507a0SLi Zefan case Opt_compress_type: 470261507a0SLi Zefan if (token == Opt_compress || 471261507a0SLi Zefan token == Opt_compress_force || 472261507a0SLi Zefan strcmp(args[0].from, "zlib") == 0) { 473261507a0SLi Zefan compress_type = "zlib"; 474261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 475063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 476bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 477bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 478a6fa6faeSLi Zefan } else if (strcmp(args[0].from, "lzo") == 0) { 479a6fa6faeSLi Zefan compress_type = "lzo"; 480a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 481063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 482bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 483bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 4842b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 485063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 486063849eaSArnd Hannemann compress_type = "no"; 487063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 488063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 489063849eaSArnd Hannemann compress_force = false; 490261507a0SLi Zefan } else { 491261507a0SLi Zefan ret = -EINVAL; 492261507a0SLi Zefan goto out; 493261507a0SLi Zefan } 494261507a0SLi Zefan 495261507a0SLi Zefan if (compress_force) { 49607802534SQu Wenruo btrfs_set_and_info(root, FORCE_COMPRESS, 49707802534SQu Wenruo "force %s compression", 498261507a0SLi Zefan compress_type); 499143f3636SDavid Sterba } else { 50007802534SQu Wenruo if (!btrfs_test_opt(root, COMPRESS)) 50107802534SQu Wenruo btrfs_info(root->fs_info, 502351fd353SDavid Sterba "btrfs: use %s compression", 503261507a0SLi Zefan compress_type); 5044027e0f4SWang Shilong /* 5054027e0f4SWang Shilong * If we remount from compress-force=xxx to 5064027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 5074027e0f4SWang Shilong * flag, otherwise, there is no way for users 5084027e0f4SWang Shilong * to disable forcible compression separately. 5094027e0f4SWang Shilong */ 5104027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 511a7e252afSMiao Xie } 512a555f810SChris Mason break; 513e18e4809SChris Mason case Opt_ssd: 51407802534SQu Wenruo btrfs_set_and_info(root, SSD, 51507802534SQu Wenruo "use ssd allocation scheme"); 516e18e4809SChris Mason break; 517451d7585SChris Mason case Opt_ssd_spread: 51807802534SQu Wenruo btrfs_set_and_info(root, SSD_SPREAD, 51907802534SQu Wenruo "use spread ssd allocation scheme"); 5202aa06a35SEric Sandeen btrfs_set_opt(info->mount_opt, SSD); 521451d7585SChris Mason break; 5223b30c22fSChris Mason case Opt_nossd: 5232aa06a35SEric Sandeen btrfs_set_and_info(root, NOSSD, 52407802534SQu Wenruo "not using ssd allocation scheme"); 5253b30c22fSChris Mason btrfs_clear_opt(info->mount_opt, SSD); 5263b30c22fSChris Mason break; 527842bef58SQu Wenruo case Opt_barrier: 52807802534SQu Wenruo btrfs_clear_and_info(root, NOBARRIER, 52907802534SQu Wenruo "turning on barriers"); 530842bef58SQu Wenruo break; 53121ad10cfSChris Mason case Opt_nobarrier: 53207802534SQu Wenruo btrfs_set_and_info(root, NOBARRIER, 53307802534SQu Wenruo "turning off barriers"); 53421ad10cfSChris Mason break; 5354543df7eSChris Mason case Opt_thread_pool: 5362c334e87SWang Shilong ret = match_int(&args[0], &intarg); 5372c334e87SWang Shilong if (ret) { 5382c334e87SWang Shilong goto out; 5392c334e87SWang Shilong } else if (intarg > 0) { 5404543df7eSChris Mason info->thread_pool_size = intarg; 5412c334e87SWang Shilong } else { 5422c334e87SWang Shilong ret = -EINVAL; 5432c334e87SWang Shilong goto out; 5442c334e87SWang Shilong } 5454543df7eSChris Mason break; 5466f568d35SChris Mason case Opt_max_inline: 547edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5486f568d35SChris Mason if (num) { 54991748467SAkinobu Mita info->max_inline = memparse(num, NULL); 5506f568d35SChris Mason kfree(num); 5516f568d35SChris Mason 55215ada040SChris Mason if (info->max_inline) { 553feb5f965SMitch Harder info->max_inline = min_t(u64, 55415ada040SChris Mason info->max_inline, 55515ada040SChris Mason root->sectorsize); 55615ada040SChris Mason } 557efe120a0SFrank Holton btrfs_info(root->fs_info, "max_inline at %llu", 558c1c9ff7cSGeert Uytterhoeven info->max_inline); 5592c334e87SWang Shilong } else { 5602c334e87SWang Shilong ret = -ENOMEM; 5612c334e87SWang Shilong goto out; 5626f568d35SChris Mason } 5636f568d35SChris Mason break; 5648f662a76SChris Mason case Opt_alloc_start: 565edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5668f662a76SChris Mason if (num) { 567c018daecSMiao Xie mutex_lock(&info->chunk_mutex); 56891748467SAkinobu Mita info->alloc_start = memparse(num, NULL); 569c018daecSMiao Xie mutex_unlock(&info->chunk_mutex); 5708f662a76SChris Mason kfree(num); 571efe120a0SFrank Holton btrfs_info(root->fs_info, "allocations start at %llu", 572c1c9ff7cSGeert Uytterhoeven info->alloc_start); 5732c334e87SWang Shilong } else { 5742c334e87SWang Shilong ret = -ENOMEM; 5752c334e87SWang Shilong goto out; 5768f662a76SChris Mason } 5778f662a76SChris Mason break; 578bd0330adSQu Wenruo case Opt_acl: 57945ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 580bd0330adSQu Wenruo root->fs_info->sb->s_flags |= MS_POSIXACL; 581bd0330adSQu Wenruo break; 58245ff35d6SGuangliang Zhao #else 58345ff35d6SGuangliang Zhao btrfs_err(root->fs_info, 58445ff35d6SGuangliang Zhao "support for ACL not compiled in!"); 58545ff35d6SGuangliang Zhao ret = -EINVAL; 58645ff35d6SGuangliang Zhao goto out; 58745ff35d6SGuangliang Zhao #endif 58833268eafSJosef Bacik case Opt_noacl: 58933268eafSJosef Bacik root->fs_info->sb->s_flags &= ~MS_POSIXACL; 59033268eafSJosef Bacik break; 5913a5e1404SSage Weil case Opt_notreelog: 59207802534SQu Wenruo btrfs_set_and_info(root, NOTREELOG, 59307802534SQu Wenruo "disabling tree log"); 5943a5e1404SSage Weil break; 595a88998f2SQu Wenruo case Opt_treelog: 59607802534SQu Wenruo btrfs_clear_and_info(root, NOTREELOG, 59707802534SQu Wenruo "enabling tree log"); 598a88998f2SQu Wenruo break; 599dccae999SSage Weil case Opt_flushoncommit: 60007802534SQu Wenruo btrfs_set_and_info(root, FLUSHONCOMMIT, 60107802534SQu Wenruo "turning on flush-on-commit"); 602dccae999SSage Weil break; 6032c9ee856SQu Wenruo case Opt_noflushoncommit: 60407802534SQu Wenruo btrfs_clear_and_info(root, FLUSHONCOMMIT, 60507802534SQu Wenruo "turning off flush-on-commit"); 6062c9ee856SQu Wenruo break; 60797e728d4SJosef Bacik case Opt_ratio: 6082c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6092c334e87SWang Shilong if (ret) { 6102c334e87SWang Shilong goto out; 6112c334e87SWang Shilong } else if (intarg >= 0) { 61297e728d4SJosef Bacik info->metadata_ratio = intarg; 613efe120a0SFrank Holton btrfs_info(root->fs_info, "metadata ratio %d", 61497e728d4SJosef Bacik info->metadata_ratio); 6152c334e87SWang Shilong } else { 6162c334e87SWang Shilong ret = -EINVAL; 6172c334e87SWang Shilong goto out; 61897e728d4SJosef Bacik } 61997e728d4SJosef Bacik break; 620e244a0aeSChristoph Hellwig case Opt_discard: 62107802534SQu Wenruo btrfs_set_and_info(root, DISCARD, 62207802534SQu Wenruo "turning on discard"); 623e244a0aeSChristoph Hellwig break; 624e07a2adeSQu Wenruo case Opt_nodiscard: 62507802534SQu Wenruo btrfs_clear_and_info(root, DISCARD, 62607802534SQu Wenruo "turning off discard"); 627e07a2adeSQu Wenruo break; 6280af3d00bSJosef Bacik case Opt_space_cache: 62907802534SQu Wenruo btrfs_set_and_info(root, SPACE_CACHE, 63007802534SQu Wenruo "enabling disk space caching"); 6310de90876SJosef Bacik break; 632f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 633f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 634f420ee1eSStefan Behrens break; 63573bc1876SJosef Bacik case Opt_no_space_cache: 63607802534SQu Wenruo btrfs_clear_and_info(root, SPACE_CACHE, 63707802534SQu Wenruo "disabling disk space caching"); 63873bc1876SJosef Bacik break; 6394b9465cbSChris Mason case Opt_inode_cache: 6407e1876acSDavid Sterba btrfs_set_pending_and_info(info, INODE_MAP_CACHE, 64107802534SQu Wenruo "enabling inode map caching"); 6423818aea2SQu Wenruo break; 6433818aea2SQu Wenruo case Opt_noinode_cache: 6447e1876acSDavid Sterba btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, 64507802534SQu Wenruo "disabling inode map caching"); 6464b9465cbSChris Mason break; 64788c2ba3bSJosef Bacik case Opt_clear_cache: 64807802534SQu Wenruo btrfs_set_and_info(root, CLEAR_CACHE, 64907802534SQu Wenruo "force clearing of disk cache"); 6500af3d00bSJosef Bacik break; 6514260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 6524260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 6534260f7c7SSage Weil break; 65491435650SChris Mason case Opt_enospc_debug: 65591435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 65691435650SChris Mason break; 65753036293SQu Wenruo case Opt_noenospc_debug: 65853036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 65953036293SQu Wenruo break; 6604cb5300bSChris Mason case Opt_defrag: 66107802534SQu Wenruo btrfs_set_and_info(root, AUTO_DEFRAG, 66207802534SQu Wenruo "enabling auto defrag"); 6634cb5300bSChris Mason break; 664fc0ca9afSQu Wenruo case Opt_nodefrag: 66507802534SQu Wenruo btrfs_clear_and_info(root, AUTO_DEFRAG, 66607802534SQu Wenruo "disabling auto defrag"); 667fc0ca9afSQu Wenruo break; 668af31f5e5SChris Mason case Opt_recovery: 669efe120a0SFrank Holton btrfs_info(root->fs_info, "enabling auto recovery"); 670af31f5e5SChris Mason btrfs_set_opt(info->mount_opt, RECOVERY); 671af31f5e5SChris Mason break; 6729555c6c1SIlya Dryomov case Opt_skip_balance: 6739555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 6749555c6c1SIlya Dryomov break; 67521adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 67621adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 677efe120a0SFrank Holton btrfs_info(root->fs_info, 678efe120a0SFrank Holton "enabling check integrity including extent data"); 67921adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 68021adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 68121adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 68221adbd5cSStefan Behrens break; 68321adbd5cSStefan Behrens case Opt_check_integrity: 684efe120a0SFrank Holton btrfs_info(root->fs_info, "enabling check integrity"); 68521adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 68621adbd5cSStefan Behrens break; 68721adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 6882c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6892c334e87SWang Shilong if (ret) { 6902c334e87SWang Shilong goto out; 6912c334e87SWang Shilong } else if (intarg >= 0) { 69221adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 693efe120a0SFrank Holton btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", 69421adbd5cSStefan Behrens info->check_integrity_print_mask); 6952c334e87SWang Shilong } else { 6962c334e87SWang Shilong ret = -EINVAL; 6972c334e87SWang Shilong goto out; 69821adbd5cSStefan Behrens } 69921adbd5cSStefan Behrens break; 70021adbd5cSStefan Behrens #else 70121adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 70221adbd5cSStefan Behrens case Opt_check_integrity: 70321adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 704efe120a0SFrank Holton btrfs_err(root->fs_info, 705efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 70621adbd5cSStefan Behrens ret = -EINVAL; 70721adbd5cSStefan Behrens goto out; 70821adbd5cSStefan Behrens #endif 7098c342930SJeff Mahoney case Opt_fatal_errors: 7108c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 7118c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 7128c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 7138c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 7148c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 7158c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 7168c342930SJeff Mahoney else { 7178c342930SJeff Mahoney ret = -EINVAL; 7188c342930SJeff Mahoney goto out; 7198c342930SJeff Mahoney } 7208c342930SJeff Mahoney break; 7218b87dc17SDavid Sterba case Opt_commit_interval: 7228b87dc17SDavid Sterba intarg = 0; 7238b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 7248b87dc17SDavid Sterba if (ret < 0) { 725efe120a0SFrank Holton btrfs_err(root->fs_info, "invalid commit interval"); 7268b87dc17SDavid Sterba ret = -EINVAL; 7278b87dc17SDavid Sterba goto out; 7288b87dc17SDavid Sterba } 7298b87dc17SDavid Sterba if (intarg > 0) { 7308b87dc17SDavid Sterba if (intarg > 300) { 731efe120a0SFrank Holton btrfs_warn(root->fs_info, "excessive commit interval %d", 7328b87dc17SDavid Sterba intarg); 7338b87dc17SDavid Sterba } 7348b87dc17SDavid Sterba info->commit_interval = intarg; 7358b87dc17SDavid Sterba } else { 736efe120a0SFrank Holton btrfs_info(root->fs_info, "using default commit interval %ds", 7378b87dc17SDavid Sterba BTRFS_DEFAULT_COMMIT_INTERVAL); 7388b87dc17SDavid Sterba info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 7398b87dc17SDavid Sterba } 7408b87dc17SDavid Sterba break; 741a7a3f7caSSage Weil case Opt_err: 742efe120a0SFrank Holton btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); 743a7a3f7caSSage Weil ret = -EINVAL; 744a7a3f7caSSage Weil goto out; 74595e05289SChris Mason default: 746be20aa9dSChris Mason break; 74795e05289SChris Mason } 74895e05289SChris Mason } 749a7a3f7caSSage Weil out: 75073bc1876SJosef Bacik if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 751efe120a0SFrank Holton btrfs_info(root->fs_info, "disk space caching is enabled"); 752da495eccSJosef Bacik kfree(orig); 753a7a3f7caSSage Weil return ret; 754edf24abeSChristoph Hellwig } 755edf24abeSChristoph Hellwig 756edf24abeSChristoph Hellwig /* 757edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 758edf24abeSChristoph Hellwig * 759edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 760edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 761edf24abeSChristoph Hellwig */ 76297288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 76373f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 7645e2a4b25SDavid Sterba struct btrfs_fs_devices **fs_devices) 765edf24abeSChristoph Hellwig { 766edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 76783c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 7681493381fSWang Shilong char *num = NULL; 769edf24abeSChristoph Hellwig int error = 0; 770edf24abeSChristoph Hellwig 771edf24abeSChristoph Hellwig if (!options) 772830c4adbSJosef Bacik return 0; 773edf24abeSChristoph Hellwig 774edf24abeSChristoph Hellwig /* 775edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 776edf24abeSChristoph Hellwig * gets called twice 777edf24abeSChristoph Hellwig */ 778edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 779edf24abeSChristoph Hellwig if (!opts) 780edf24abeSChristoph Hellwig return -ENOMEM; 7813f3d0bc0STero Roponen orig = opts; 782edf24abeSChristoph Hellwig 783edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 784edf24abeSChristoph Hellwig int token; 785edf24abeSChristoph Hellwig if (!*p) 786edf24abeSChristoph Hellwig continue; 787edf24abeSChristoph Hellwig 788edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 789edf24abeSChristoph Hellwig switch (token) { 790edf24abeSChristoph Hellwig case Opt_subvol: 791a90e8b6fSIlya Dryomov kfree(*subvol_name); 792edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 7932c334e87SWang Shilong if (!*subvol_name) { 7942c334e87SWang Shilong error = -ENOMEM; 7952c334e87SWang Shilong goto out; 7962c334e87SWang Shilong } 797edf24abeSChristoph Hellwig break; 79873f73415SJosef Bacik case Opt_subvolid: 7991493381fSWang Shilong num = match_strdup(&args[0]); 8001493381fSWang Shilong if (num) { 8011493381fSWang Shilong *subvol_objectid = memparse(num, NULL); 8021493381fSWang Shilong kfree(num); 8034849f01dSJosef Bacik /* we want the original fs_tree */ 8041493381fSWang Shilong if (!*subvol_objectid) 8054849f01dSJosef Bacik *subvol_objectid = 8064849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 8072c334e87SWang Shilong } else { 8082c334e87SWang Shilong error = -EINVAL; 8092c334e87SWang Shilong goto out; 8104849f01dSJosef Bacik } 81173f73415SJosef Bacik break; 812e15d0542SXin Zhong case Opt_subvolrootid: 8135e2a4b25SDavid Sterba printk(KERN_WARNING 814efe120a0SFrank Holton "BTRFS: 'subvolrootid' mount option is deprecated and has " 815efe120a0SFrank Holton "no effect\n"); 816e15d0542SXin Zhong break; 81743e570b0SChristoph Hellwig case Opt_device: 81883c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 81983c8c9bdSJeff Liu if (!device_name) { 82083c8c9bdSJeff Liu error = -ENOMEM; 82183c8c9bdSJeff Liu goto out; 82283c8c9bdSJeff Liu } 82383c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 82443e570b0SChristoph Hellwig flags, holder, fs_devices); 82583c8c9bdSJeff Liu kfree(device_name); 82643e570b0SChristoph Hellwig if (error) 827830c4adbSJosef Bacik goto out; 82843e570b0SChristoph Hellwig break; 829edf24abeSChristoph Hellwig default: 830edf24abeSChristoph Hellwig break; 831edf24abeSChristoph Hellwig } 832edf24abeSChristoph Hellwig } 833edf24abeSChristoph Hellwig 834edf24abeSChristoph Hellwig out: 835830c4adbSJosef Bacik kfree(orig); 836edf24abeSChristoph Hellwig return error; 83795e05289SChris Mason } 83895e05289SChris Mason 839*05dbe683SOmar Sandoval static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 84073f73415SJosef Bacik u64 subvol_objectid) 84173f73415SJosef Bacik { 842815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 843*05dbe683SOmar Sandoval struct btrfs_root *fs_root; 844*05dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 845*05dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 846*05dbe683SOmar Sandoval struct btrfs_key key; 847*05dbe683SOmar Sandoval struct btrfs_path *path = NULL; 848*05dbe683SOmar Sandoval char *name = NULL, *ptr; 849*05dbe683SOmar Sandoval u64 dirid; 850*05dbe683SOmar Sandoval int len; 851*05dbe683SOmar Sandoval int ret; 852*05dbe683SOmar Sandoval 853*05dbe683SOmar Sandoval path = btrfs_alloc_path(); 854*05dbe683SOmar Sandoval if (!path) { 855*05dbe683SOmar Sandoval ret = -ENOMEM; 856*05dbe683SOmar Sandoval goto err; 857*05dbe683SOmar Sandoval } 858*05dbe683SOmar Sandoval path->leave_spinning = 1; 859*05dbe683SOmar Sandoval 860*05dbe683SOmar Sandoval name = kmalloc(PATH_MAX, GFP_NOFS); 861*05dbe683SOmar Sandoval if (!name) { 862*05dbe683SOmar Sandoval ret = -ENOMEM; 863*05dbe683SOmar Sandoval goto err; 864*05dbe683SOmar Sandoval } 865*05dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 866*05dbe683SOmar Sandoval ptr[0] = '\0'; 867*05dbe683SOmar Sandoval 868*05dbe683SOmar Sandoval /* 869*05dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 870*05dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 871*05dbe683SOmar Sandoval */ 872*05dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 873*05dbe683SOmar Sandoval key.objectid = subvol_objectid; 874*05dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 875*05dbe683SOmar Sandoval key.offset = (u64)-1; 876*05dbe683SOmar Sandoval 877*05dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 878*05dbe683SOmar Sandoval if (ret < 0) { 879*05dbe683SOmar Sandoval goto err; 880*05dbe683SOmar Sandoval } else if (ret > 0) { 881*05dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 882*05dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 883*05dbe683SOmar Sandoval if (ret < 0) { 884*05dbe683SOmar Sandoval goto err; 885*05dbe683SOmar Sandoval } else if (ret > 0) { 886*05dbe683SOmar Sandoval ret = -ENOENT; 887*05dbe683SOmar Sandoval goto err; 888*05dbe683SOmar Sandoval } 889*05dbe683SOmar Sandoval } 890*05dbe683SOmar Sandoval 891*05dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 892*05dbe683SOmar Sandoval subvol_objectid = key.offset; 893*05dbe683SOmar Sandoval 894*05dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 895*05dbe683SOmar Sandoval struct btrfs_root_ref); 896*05dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 897*05dbe683SOmar Sandoval ptr -= len + 1; 898*05dbe683SOmar Sandoval if (ptr < name) { 899*05dbe683SOmar Sandoval ret = -ENAMETOOLONG; 900*05dbe683SOmar Sandoval goto err; 901*05dbe683SOmar Sandoval } 902*05dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 903*05dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 904*05dbe683SOmar Sandoval ptr[0] = '/'; 905*05dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 906*05dbe683SOmar Sandoval btrfs_release_path(path); 907*05dbe683SOmar Sandoval 908*05dbe683SOmar Sandoval key.objectid = subvol_objectid; 909*05dbe683SOmar Sandoval key.type = BTRFS_ROOT_ITEM_KEY; 910*05dbe683SOmar Sandoval key.offset = (u64)-1; 911*05dbe683SOmar Sandoval fs_root = btrfs_read_fs_root_no_name(fs_info, &key); 912*05dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 913*05dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 914*05dbe683SOmar Sandoval goto err; 915*05dbe683SOmar Sandoval } 916*05dbe683SOmar Sandoval 917*05dbe683SOmar Sandoval /* 918*05dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 919*05dbe683SOmar Sandoval * root directory. 920*05dbe683SOmar Sandoval */ 921*05dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 922*05dbe683SOmar Sandoval key.objectid = dirid; 923*05dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 924*05dbe683SOmar Sandoval key.offset = (u64)-1; 925*05dbe683SOmar Sandoval 926*05dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 927*05dbe683SOmar Sandoval if (ret < 0) { 928*05dbe683SOmar Sandoval goto err; 929*05dbe683SOmar Sandoval } else if (ret > 0) { 930*05dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 931*05dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 932*05dbe683SOmar Sandoval if (ret < 0) { 933*05dbe683SOmar Sandoval goto err; 934*05dbe683SOmar Sandoval } else if (ret > 0) { 935*05dbe683SOmar Sandoval ret = -ENOENT; 936*05dbe683SOmar Sandoval goto err; 937*05dbe683SOmar Sandoval } 938*05dbe683SOmar Sandoval } 939*05dbe683SOmar Sandoval 940*05dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 941*05dbe683SOmar Sandoval dirid = key.offset; 942*05dbe683SOmar Sandoval 943*05dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 944*05dbe683SOmar Sandoval path->slots[0], 945*05dbe683SOmar Sandoval struct btrfs_inode_ref); 946*05dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 947*05dbe683SOmar Sandoval inode_ref); 948*05dbe683SOmar Sandoval ptr -= len + 1; 949*05dbe683SOmar Sandoval if (ptr < name) { 950*05dbe683SOmar Sandoval ret = -ENAMETOOLONG; 951*05dbe683SOmar Sandoval goto err; 952*05dbe683SOmar Sandoval } 953*05dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 954*05dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 955*05dbe683SOmar Sandoval ptr[0] = '/'; 956*05dbe683SOmar Sandoval btrfs_release_path(path); 957*05dbe683SOmar Sandoval } 958*05dbe683SOmar Sandoval } 959*05dbe683SOmar Sandoval 960*05dbe683SOmar Sandoval btrfs_free_path(path); 961*05dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 962*05dbe683SOmar Sandoval name[0] = '/'; 963*05dbe683SOmar Sandoval name[1] = '\0'; 964*05dbe683SOmar Sandoval } else { 965*05dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 966*05dbe683SOmar Sandoval } 967*05dbe683SOmar Sandoval return name; 968*05dbe683SOmar Sandoval 969*05dbe683SOmar Sandoval err: 970*05dbe683SOmar Sandoval btrfs_free_path(path); 971*05dbe683SOmar Sandoval kfree(name); 972*05dbe683SOmar Sandoval return ERR_PTR(ret); 973*05dbe683SOmar Sandoval } 974*05dbe683SOmar Sandoval 975*05dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 976*05dbe683SOmar Sandoval { 977*05dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 97873f73415SJosef Bacik struct btrfs_dir_item *di; 97973f73415SJosef Bacik struct btrfs_path *path; 98073f73415SJosef Bacik struct btrfs_key location; 98173f73415SJosef Bacik u64 dir_id; 98273f73415SJosef Bacik 98373f73415SJosef Bacik path = btrfs_alloc_path(); 98473f73415SJosef Bacik if (!path) 985*05dbe683SOmar Sandoval return -ENOMEM; 98673f73415SJosef Bacik path->leave_spinning = 1; 98773f73415SJosef Bacik 98873f73415SJosef Bacik /* 98973f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 99073f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 99173f73415SJosef Bacik * to mount. 99273f73415SJosef Bacik */ 993815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 99473f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 995b0839166SJulia Lawall if (IS_ERR(di)) { 996b0839166SJulia Lawall btrfs_free_path(path); 997*05dbe683SOmar Sandoval return PTR_ERR(di); 998b0839166SJulia Lawall } 99973f73415SJosef Bacik if (!di) { 100073f73415SJosef Bacik /* 100173f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 100273f73415SJosef Bacik * it's always been there, but don't freak out, just try and 1003*05dbe683SOmar Sandoval * mount the top-level subvolume. 100473f73415SJosef Bacik */ 100573f73415SJosef Bacik btrfs_free_path(path); 1006*05dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 1007*05dbe683SOmar Sandoval return 0; 100873f73415SJosef Bacik } 100973f73415SJosef Bacik 101073f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 101173f73415SJosef Bacik btrfs_free_path(path); 1012*05dbe683SOmar Sandoval *objectid = location.objectid; 1013*05dbe683SOmar Sandoval return 0; 101473f73415SJosef Bacik } 101573f73415SJosef Bacik 10168a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 10178a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 10188a4b83ccSChris Mason void *data, int silent) 10192e635a27SChris Mason { 10202e635a27SChris Mason struct inode *inode; 1021815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 10225d4f98a2SYan Zheng struct btrfs_key key; 102339279cc3SChris Mason int err; 10242e635a27SChris Mason 10252e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 10262e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1027e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1028af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1029be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 10305103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 10312e635a27SChris Mason sb->s_time_gran = 1; 10320eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 103333268eafSJosef Bacik sb->s_flags |= MS_POSIXACL; 103449cf6f45SChris Ball #endif 10350c4d2d95SJosef Bacik sb->s_flags |= MS_I_VERSION; 1036ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1037ad2b2c80SAl Viro if (err) { 1038efe120a0SFrank Holton printk(KERN_ERR "BTRFS: open_ctree failed\n"); 1039ad2b2c80SAl Viro return err; 1040e20d96d6SChris Mason } 1041b888db2bSChris Mason 10425d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 10435d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 10445d4f98a2SYan Zheng key.offset = 0; 104598c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 10465d4f98a2SYan Zheng if (IS_ERR(inode)) { 10475d4f98a2SYan Zheng err = PTR_ERR(inode); 104839279cc3SChris Mason goto fail_close; 104939279cc3SChris Mason } 10502e635a27SChris Mason 105148fde701SAl Viro sb->s_root = d_make_root(inode); 105248fde701SAl Viro if (!sb->s_root) { 105339279cc3SChris Mason err = -ENOMEM; 105439279cc3SChris Mason goto fail_close; 10552e635a27SChris Mason } 105658176a96SJosef Bacik 10576885f308SChris Mason save_mount_options(sb, data); 105890a887c9SDan Magenheimer cleancache_init_fs(sb); 105959553edfSAl Viro sb->s_flags |= MS_ACTIVE; 10602e635a27SChris Mason return 0; 10612e635a27SChris Mason 106239279cc3SChris Mason fail_close: 1063815745cfSAl Viro close_ctree(fs_info->tree_root); 1064d5719762SChris Mason return err; 1065d5719762SChris Mason } 1066d5719762SChris Mason 10676bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1068d5719762SChris Mason { 1069d5719762SChris Mason struct btrfs_trans_handle *trans; 1070815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1071815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1072df2ce34cSChris Mason 10731abe9b8aSliubo trace_btrfs_sync_fs(wait); 10741abe9b8aSliubo 1075d561c025SChris Mason if (!wait) { 1076815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1077df2ce34cSChris Mason return 0; 1078d561c025SChris Mason } 1079771ed689SChris Mason 1080b0244199SMiao Xie btrfs_wait_ordered_roots(fs_info, -1); 1081771ed689SChris Mason 1082d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 108360376ce4SJosef Bacik if (IS_ERR(trans)) { 1084354aa0fbSMiao Xie /* no transaction, don't bother */ 10856b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 10866b5fe46dSDavid Sterba /* 10876b5fe46dSDavid Sterba * Exit unless we have some pending changes 10886b5fe46dSDavid Sterba * that need to go through commit 10896b5fe46dSDavid Sterba */ 10906b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1091bd7de2c9SJosef Bacik return 0; 1092a53f4f8eSQu Wenruo /* 1093a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1094a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1095a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1096a53f4f8eSQu Wenruo * next commit after thawing. 1097a53f4f8eSQu Wenruo */ 1098a53f4f8eSQu Wenruo if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) 1099a53f4f8eSQu Wenruo __sb_end_write(sb, SB_FREEZE_WRITE); 1100a53f4f8eSQu Wenruo else 1101a53f4f8eSQu Wenruo return 0; 11026b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 110360376ce4SJosef Bacik } 110498bd5c54SDavid Sterba if (IS_ERR(trans)) 110598bd5c54SDavid Sterba return PTR_ERR(trans); 11066b5fe46dSDavid Sterba } 1107bd7de2c9SJosef Bacik return btrfs_commit_transaction(trans, root); 1108d5719762SChris Mason } 1109d5719762SChris Mason 111034c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1111a9572a15SEric Paris { 1112815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 1113815745cfSAl Viro struct btrfs_root *root = info->tree_root; 1114200da64eSTsutomu Itoh char *compress_type; 1115a9572a15SEric Paris 1116a9572a15SEric Paris if (btrfs_test_opt(root, DEGRADED)) 1117a9572a15SEric Paris seq_puts(seq, ",degraded"); 1118a9572a15SEric Paris if (btrfs_test_opt(root, NODATASUM)) 1119a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 1120a9572a15SEric Paris if (btrfs_test_opt(root, NODATACOW)) 1121a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 1122a9572a15SEric Paris if (btrfs_test_opt(root, NOBARRIER)) 1123a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 112495ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1125c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1126a9572a15SEric Paris if (info->alloc_start != 0) 1127c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",alloc_start=%llu", info->alloc_start); 1128a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1129a9572a15SEric Paris num_online_cpus() + 2, 8)) 1130a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 1131200da64eSTsutomu Itoh if (btrfs_test_opt(root, COMPRESS)) { 1132200da64eSTsutomu Itoh if (info->compress_type == BTRFS_COMPRESS_ZLIB) 1133200da64eSTsutomu Itoh compress_type = "zlib"; 1134200da64eSTsutomu Itoh else 1135200da64eSTsutomu Itoh compress_type = "lzo"; 1136200da64eSTsutomu Itoh if (btrfs_test_opt(root, FORCE_COMPRESS)) 1137200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1138200da64eSTsutomu Itoh else 1139200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1140200da64eSTsutomu Itoh } 1141c289811cSChris Mason if (btrfs_test_opt(root, NOSSD)) 1142c289811cSChris Mason seq_puts(seq, ",nossd"); 1143451d7585SChris Mason if (btrfs_test_opt(root, SSD_SPREAD)) 1144451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 1145451d7585SChris Mason else if (btrfs_test_opt(root, SSD)) 1146a9572a15SEric Paris seq_puts(seq, ",ssd"); 11473a5e1404SSage Weil if (btrfs_test_opt(root, NOTREELOG)) 11486b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 1149dccae999SSage Weil if (btrfs_test_opt(root, FLUSHONCOMMIT)) 11506b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 115120a5239aSMatthew Wilcox if (btrfs_test_opt(root, DISCARD)) 115220a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 1153a9572a15SEric Paris if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 1154a9572a15SEric Paris seq_puts(seq, ",noacl"); 1155200da64eSTsutomu Itoh if (btrfs_test_opt(root, SPACE_CACHE)) 1156200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 115773bc1876SJosef Bacik else 11588965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 1159f420ee1eSStefan Behrens if (btrfs_test_opt(root, RESCAN_UUID_TREE)) 1160f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 1161200da64eSTsutomu Itoh if (btrfs_test_opt(root, CLEAR_CACHE)) 1162200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 1163200da64eSTsutomu Itoh if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 1164200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 11650942caa3SDavid Sterba if (btrfs_test_opt(root, ENOSPC_DEBUG)) 11660942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 11670942caa3SDavid Sterba if (btrfs_test_opt(root, AUTO_DEFRAG)) 11680942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 11690942caa3SDavid Sterba if (btrfs_test_opt(root, INODE_MAP_CACHE)) 11700942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 11719555c6c1SIlya Dryomov if (btrfs_test_opt(root, SKIP_BALANCE)) 11729555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 11738507d216SWang Shilong if (btrfs_test_opt(root, RECOVERY)) 11748507d216SWang Shilong seq_puts(seq, ",recovery"); 11758507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 11768507d216SWang Shilong if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 11778507d216SWang Shilong seq_puts(seq, ",check_int_data"); 11788507d216SWang Shilong else if (btrfs_test_opt(root, CHECK_INTEGRITY)) 11798507d216SWang Shilong seq_puts(seq, ",check_int"); 11808507d216SWang Shilong if (info->check_integrity_print_mask) 11818507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 11828507d216SWang Shilong info->check_integrity_print_mask); 11838507d216SWang Shilong #endif 11848507d216SWang Shilong if (info->metadata_ratio) 11858507d216SWang Shilong seq_printf(seq, ",metadata_ratio=%d", 11868507d216SWang Shilong info->metadata_ratio); 11878c342930SJeff Mahoney if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 11888c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 11898b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 11908b87dc17SDavid Sterba seq_printf(seq, ",commit=%d", info->commit_interval); 1191a9572a15SEric Paris return 0; 1192a9572a15SEric Paris } 1193a9572a15SEric Paris 1194a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 11952e635a27SChris Mason { 1196815745cfSAl Viro struct btrfs_fs_info *p = data; 1197815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 11984b82d6e4SYan 1199815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 12004b82d6e4SYan } 12014b82d6e4SYan 1202450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1203450ba0eaSJosef Bacik { 12046de1d09dSAl Viro int err = set_anon_super(s, data); 12056de1d09dSAl Viro if (!err) 1206450ba0eaSJosef Bacik s->s_fs_info = data; 12076de1d09dSAl Viro return err; 1208450ba0eaSJosef Bacik } 1209450ba0eaSJosef Bacik 1210830c4adbSJosef Bacik /* 1211f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1212f9d9ef62SDavid Sterba */ 1213f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1214f9d9ef62SDavid Sterba { 1215f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1216f9d9ef62SDavid Sterba return 1; 1217f9d9ef62SDavid Sterba return 0; 1218f9d9ef62SDavid Sterba } 1219f9d9ef62SDavid Sterba 1220f9d9ef62SDavid Sterba /* 1221e6e4dbe8SOmar Sandoval * This will add subvolid=0 to the argument string while removing any subvol= 1222e6e4dbe8SOmar Sandoval * and subvolid= arguments to make sure we get the top-level root for path 1223e6e4dbe8SOmar Sandoval * walking to the subvol we want. 1224830c4adbSJosef Bacik */ 1225830c4adbSJosef Bacik static char *setup_root_args(char *args) 1226830c4adbSJosef Bacik { 1227e6e4dbe8SOmar Sandoval char *buf, *dst, *sep; 1228830c4adbSJosef Bacik 1229e6e4dbe8SOmar Sandoval if (!args) 1230e6e4dbe8SOmar Sandoval return kstrdup("subvolid=0", GFP_NOFS); 1231830c4adbSJosef Bacik 1232e6e4dbe8SOmar Sandoval /* The worst case is that we add ",subvolid=0" to the end. */ 1233e6e4dbe8SOmar Sandoval buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); 1234f60d16a8SJim Meyering if (!buf) 1235f60d16a8SJim Meyering return NULL; 1236830c4adbSJosef Bacik 1237e6e4dbe8SOmar Sandoval while (1) { 1238e6e4dbe8SOmar Sandoval sep = strchrnul(args, ','); 1239e6e4dbe8SOmar Sandoval if (!strstarts(args, "subvol=") && 1240e6e4dbe8SOmar Sandoval !strstarts(args, "subvolid=")) { 1241e6e4dbe8SOmar Sandoval memcpy(dst, args, sep - args); 1242e6e4dbe8SOmar Sandoval dst += sep - args; 1243e6e4dbe8SOmar Sandoval *dst++ = ','; 1244830c4adbSJosef Bacik } 1245e6e4dbe8SOmar Sandoval if (*sep) 1246e6e4dbe8SOmar Sandoval args = sep + 1; 1247e6e4dbe8SOmar Sandoval else 1248e6e4dbe8SOmar Sandoval break; 1249e6e4dbe8SOmar Sandoval } 1250f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 1251830c4adbSJosef Bacik 1252f60d16a8SJim Meyering return buf; 1253830c4adbSJosef Bacik } 1254830c4adbSJosef Bacik 1255bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1256bb289b7bSOmar Sandoval int flags, const char *device_name, 1257bb289b7bSOmar Sandoval char *data) 1258830c4adbSJosef Bacik { 1259830c4adbSJosef Bacik struct dentry *root; 1260fa330659SOmar Sandoval struct vfsmount *mnt = NULL; 1261830c4adbSJosef Bacik char *newargs; 1262fa330659SOmar Sandoval int ret; 1263830c4adbSJosef Bacik 1264830c4adbSJosef Bacik newargs = setup_root_args(data); 1265fa330659SOmar Sandoval if (!newargs) { 1266fa330659SOmar Sandoval root = ERR_PTR(-ENOMEM); 1267fa330659SOmar Sandoval goto out; 1268fa330659SOmar Sandoval } 12690723a047SHarald Hoyer 1270fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); 1271fa330659SOmar Sandoval if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { 12720723a047SHarald Hoyer if (flags & MS_RDONLY) { 1273fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, 1274fa330659SOmar Sandoval device_name, newargs); 12750723a047SHarald Hoyer } else { 1276fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, 1277fa330659SOmar Sandoval device_name, newargs); 12780040e606SChristoph Jaeger if (IS_ERR(mnt)) { 1279fa330659SOmar Sandoval root = ERR_CAST(mnt); 1280fa330659SOmar Sandoval mnt = NULL; 1281fa330659SOmar Sandoval goto out; 12820040e606SChristoph Jaeger } 12830723a047SHarald Hoyer 1284773cd04eSOmar Sandoval down_write(&mnt->mnt_sb->s_umount); 1285fa330659SOmar Sandoval ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); 1286773cd04eSOmar Sandoval up_write(&mnt->mnt_sb->s_umount); 1287fa330659SOmar Sandoval if (ret < 0) { 1288fa330659SOmar Sandoval root = ERR_PTR(ret); 1289fa330659SOmar Sandoval goto out; 12900723a047SHarald Hoyer } 12910723a047SHarald Hoyer } 12920723a047SHarald Hoyer } 1293fa330659SOmar Sandoval if (IS_ERR(mnt)) { 1294fa330659SOmar Sandoval root = ERR_CAST(mnt); 1295fa330659SOmar Sandoval mnt = NULL; 1296fa330659SOmar Sandoval goto out; 1297fa330659SOmar Sandoval } 1298830c4adbSJosef Bacik 1299*05dbe683SOmar Sandoval if (!subvol_name) { 1300*05dbe683SOmar Sandoval if (!subvol_objectid) { 1301*05dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 1302*05dbe683SOmar Sandoval &subvol_objectid); 1303*05dbe683SOmar Sandoval if (ret) { 1304*05dbe683SOmar Sandoval root = ERR_PTR(ret); 1305*05dbe683SOmar Sandoval goto out; 1306*05dbe683SOmar Sandoval } 1307*05dbe683SOmar Sandoval } 1308*05dbe683SOmar Sandoval subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), 1309*05dbe683SOmar Sandoval subvol_objectid); 1310*05dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 1311*05dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 1312*05dbe683SOmar Sandoval subvol_name = NULL; 1313*05dbe683SOmar Sandoval goto out; 1314*05dbe683SOmar Sandoval } 1315*05dbe683SOmar Sandoval 1316*05dbe683SOmar Sandoval } 1317*05dbe683SOmar Sandoval 1318ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1319fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1320fa330659SOmar Sandoval mnt = NULL; 1321830c4adbSJosef Bacik 1322bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1323ea441d11SAl Viro struct super_block *s = root->d_sb; 1324bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1325bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1326bb289b7bSOmar Sandoval 1327bb289b7bSOmar Sandoval ret = 0; 1328bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1329bb289b7bSOmar Sandoval pr_err("BTRFS: '%s' is not a valid subvolume\n", 1330bb289b7bSOmar Sandoval subvol_name); 1331bb289b7bSOmar Sandoval ret = -EINVAL; 1332bb289b7bSOmar Sandoval } 1333bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 1334*05dbe683SOmar Sandoval /* 1335*05dbe683SOmar Sandoval * This will also catch a race condition where a 1336*05dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 1337*05dbe683SOmar Sandoval * another subvolume is renamed over the old location. 1338*05dbe683SOmar Sandoval */ 1339bb289b7bSOmar Sandoval pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", 1340bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1341bb289b7bSOmar Sandoval ret = -EINVAL; 1342bb289b7bSOmar Sandoval } 1343bb289b7bSOmar Sandoval if (ret) { 1344ea441d11SAl Viro dput(root); 1345bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1346ea441d11SAl Viro deactivate_locked_super(s); 1347bb289b7bSOmar Sandoval } 1348f9d9ef62SDavid Sterba } 1349f9d9ef62SDavid Sterba 1350fa330659SOmar Sandoval out: 1351fa330659SOmar Sandoval mntput(mnt); 1352fa330659SOmar Sandoval kfree(newargs); 1353fa330659SOmar Sandoval kfree(subvol_name); 1354830c4adbSJosef Bacik return root; 1355830c4adbSJosef Bacik } 1356450ba0eaSJosef Bacik 1357f667aef6SQu Wenruo static int parse_security_options(char *orig_opts, 1358f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1359f667aef6SQu Wenruo { 1360f667aef6SQu Wenruo char *secdata = NULL; 1361f667aef6SQu Wenruo int ret = 0; 1362f667aef6SQu Wenruo 1363f667aef6SQu Wenruo secdata = alloc_secdata(); 1364f667aef6SQu Wenruo if (!secdata) 1365f667aef6SQu Wenruo return -ENOMEM; 1366f667aef6SQu Wenruo ret = security_sb_copy_data(orig_opts, secdata); 1367f667aef6SQu Wenruo if (ret) { 1368f667aef6SQu Wenruo free_secdata(secdata); 1369f667aef6SQu Wenruo return ret; 1370f667aef6SQu Wenruo } 1371f667aef6SQu Wenruo ret = security_sb_parse_opts_str(secdata, sec_opts); 1372f667aef6SQu Wenruo free_secdata(secdata); 1373f667aef6SQu Wenruo return ret; 1374f667aef6SQu Wenruo } 1375f667aef6SQu Wenruo 1376f667aef6SQu Wenruo static int setup_security_options(struct btrfs_fs_info *fs_info, 1377f667aef6SQu Wenruo struct super_block *sb, 1378f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1379f667aef6SQu Wenruo { 1380f667aef6SQu Wenruo int ret = 0; 1381f667aef6SQu Wenruo 1382f667aef6SQu Wenruo /* 1383f667aef6SQu Wenruo * Call security_sb_set_mnt_opts() to check whether new sec_opts 1384f667aef6SQu Wenruo * is valid. 1385f667aef6SQu Wenruo */ 1386f667aef6SQu Wenruo ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); 1387f667aef6SQu Wenruo if (ret) 1388f667aef6SQu Wenruo return ret; 1389f667aef6SQu Wenruo 1390a43bb39bSQu Wenruo #ifdef CONFIG_SECURITY 1391f667aef6SQu Wenruo if (!fs_info->security_opts.num_mnt_opts) { 1392f667aef6SQu Wenruo /* first time security setup, copy sec_opts to fs_info */ 1393f667aef6SQu Wenruo memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); 1394f667aef6SQu Wenruo } else { 1395f667aef6SQu Wenruo /* 1396f667aef6SQu Wenruo * Since SELinux(the only one supports security_mnt_opts) does 1397f667aef6SQu Wenruo * NOT support changing context during remount/mount same sb, 1398f667aef6SQu Wenruo * This must be the same or part of the same security options, 1399f667aef6SQu Wenruo * just free it. 1400f667aef6SQu Wenruo */ 1401f667aef6SQu Wenruo security_free_mnt_opts(sec_opts); 1402f667aef6SQu Wenruo } 1403a43bb39bSQu Wenruo #endif 1404f667aef6SQu Wenruo return ret; 1405f667aef6SQu Wenruo } 1406f667aef6SQu Wenruo 1407edf24abeSChristoph Hellwig /* 1408edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1409edf24abeSChristoph Hellwig * 1410edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1411edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1412edf24abeSChristoph Hellwig */ 1413061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1414306e16ceSDavid Sterba const char *device_name, void *data) 14154b82d6e4SYan { 14164b82d6e4SYan struct block_device *bdev = NULL; 14174b82d6e4SYan struct super_block *s; 14188a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1419450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 1420f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 142197288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 142273f73415SJosef Bacik char *subvol_name = NULL; 142373f73415SJosef Bacik u64 subvol_objectid = 0; 14244b82d6e4SYan int error = 0; 14254b82d6e4SYan 142697288f2cSChristoph Hellwig if (!(flags & MS_RDONLY)) 142797288f2cSChristoph Hellwig mode |= FMODE_WRITE; 142897288f2cSChristoph Hellwig 142997288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 143073f73415SJosef Bacik &subvol_name, &subvol_objectid, 14315e2a4b25SDavid Sterba &fs_devices); 1432f23c8af8SIlya Dryomov if (error) { 1433f23c8af8SIlya Dryomov kfree(subvol_name); 1434061dbc6bSAl Viro return ERR_PTR(error); 1435f23c8af8SIlya Dryomov } 1436edf24abeSChristoph Hellwig 1437*05dbe683SOmar Sandoval if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 1438fa330659SOmar Sandoval /* mount_subvol() will free subvol_name. */ 1439bb289b7bSOmar Sandoval return mount_subvol(subvol_name, subvol_objectid, flags, 1440bb289b7bSOmar Sandoval device_name, data); 1441830c4adbSJosef Bacik } 1442830c4adbSJosef Bacik 1443f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1444f667aef6SQu Wenruo if (data) { 1445f667aef6SQu Wenruo error = parse_security_options(data, &new_sec_opts); 14468a4b83ccSChris Mason if (error) 1447830c4adbSJosef Bacik return ERR_PTR(error); 1448f667aef6SQu Wenruo } 1449f667aef6SQu Wenruo 1450f667aef6SQu Wenruo error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1451f667aef6SQu Wenruo if (error) 1452f667aef6SQu Wenruo goto error_sec_opts; 14534b82d6e4SYan 1454450ba0eaSJosef Bacik /* 1455450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1456450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1457450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1458450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1459450ba0eaSJosef Bacik */ 1460450ba0eaSJosef Bacik fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 1461f667aef6SQu Wenruo if (!fs_info) { 1462f667aef6SQu Wenruo error = -ENOMEM; 1463f667aef6SQu Wenruo goto error_sec_opts; 1464f667aef6SQu Wenruo } 146504d21a24SIlya Dryomov 1466450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1467450ba0eaSJosef Bacik 14686c41761fSDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 14696c41761fSDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 1470f667aef6SQu Wenruo security_init_mnt_opts(&fs_info->security_opts); 14716c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 14726c41761fSDavid Sterba error = -ENOMEM; 147304d21a24SIlya Dryomov goto error_fs_info; 147404d21a24SIlya Dryomov } 147504d21a24SIlya Dryomov 147604d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 147704d21a24SIlya Dryomov if (error) 147804d21a24SIlya Dryomov goto error_fs_info; 147904d21a24SIlya Dryomov 148004d21a24SIlya Dryomov if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 148104d21a24SIlya Dryomov error = -EACCES; 14826c41761fSDavid Sterba goto error_close_devices; 14836c41761fSDavid Sterba } 14846c41761fSDavid Sterba 1485dfe25020SChris Mason bdev = fs_devices->latest_bdev; 14869249e17fSDavid Howells s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 14879249e17fSDavid Howells fs_info); 1488830c4adbSJosef Bacik if (IS_ERR(s)) { 1489830c4adbSJosef Bacik error = PTR_ERR(s); 1490830c4adbSJosef Bacik goto error_close_devices; 1491830c4adbSJosef Bacik } 14924b82d6e4SYan 14934b82d6e4SYan if (s->s_root) { 14942b82032cSYan Zheng btrfs_close_devices(fs_devices); 14956c41761fSDavid Sterba free_fs_info(fs_info); 149659553edfSAl Viro if ((flags ^ s->s_flags) & MS_RDONLY) 149759553edfSAl Viro error = -EBUSY; 14984b82d6e4SYan } else { 14994b82d6e4SYan char b[BDEVNAME_SIZE]; 15004b82d6e4SYan 15014b82d6e4SYan strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1502815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 15038a4b83ccSChris Mason error = btrfs_fill_super(s, fs_devices, data, 15048a4b83ccSChris Mason flags & MS_SILENT ? 1 : 0); 15054b82d6e4SYan } 1506*05dbe683SOmar Sandoval if (error) { 1507e15d0542SXin Zhong deactivate_locked_super(s); 1508f667aef6SQu Wenruo goto error_sec_opts; 1509f667aef6SQu Wenruo } 1510f667aef6SQu Wenruo 1511f667aef6SQu Wenruo fs_info = btrfs_sb(s); 1512f667aef6SQu Wenruo error = setup_security_options(fs_info, s, &new_sec_opts); 1513f667aef6SQu Wenruo if (error) { 1514f667aef6SQu Wenruo deactivate_locked_super(s); 1515f667aef6SQu Wenruo goto error_sec_opts; 1516f667aef6SQu Wenruo } 15174b82d6e4SYan 1518*05dbe683SOmar Sandoval return dget(s->s_root); 15194b82d6e4SYan 1520c146afadSYan Zheng error_close_devices: 15218a4b83ccSChris Mason btrfs_close_devices(fs_devices); 152204d21a24SIlya Dryomov error_fs_info: 15236c41761fSDavid Sterba free_fs_info(fs_info); 1524f667aef6SQu Wenruo error_sec_opts: 1525f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1526061dbc6bSAl Viro return ERR_PTR(error); 15274b82d6e4SYan } 15282e635a27SChris Mason 15290d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 15300d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 15310d2450abSSergei Trofimovich { 15320d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 15330d2450abSSergei Trofimovich return; 15340d2450abSSergei Trofimovich 15350d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 15360d2450abSSergei Trofimovich 1537efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 15380d2450abSSergei Trofimovich old_pool_size, new_pool_size); 15390d2450abSSergei Trofimovich 15405cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1541afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1542a8c93d4eSQu Wenruo btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1543e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1544fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1545fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1546fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1547fccb5d86SQu Wenruo new_pool_size); 1548fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1549fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 15505b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1551736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 15520339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1553ff023aacSStefan Behrens new_pool_size); 15540d2450abSSergei Trofimovich } 15550d2450abSSergei Trofimovich 1556f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1557dc81cdc5SMiao Xie { 1558dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1559f42a34b2SMiao Xie } 1560dc81cdc5SMiao Xie 1561f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1562f42a34b2SMiao Xie unsigned long old_opts, int flags) 1563f42a34b2SMiao Xie { 1564dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1565dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1566dc81cdc5SMiao Xie (flags & MS_RDONLY))) { 1567dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1568dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1569dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 1570dc81cdc5SMiao Xie if (flags & MS_RDONLY) 1571dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1572dc81cdc5SMiao Xie } 1573dc81cdc5SMiao Xie } 1574dc81cdc5SMiao Xie 1575dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1576dc81cdc5SMiao Xie unsigned long old_opts) 1577dc81cdc5SMiao Xie { 1578dc81cdc5SMiao Xie /* 1579dc81cdc5SMiao Xie * We need cleanup all defragable inodes if the autodefragment is 1580dc81cdc5SMiao Xie * close or the fs is R/O. 1581dc81cdc5SMiao Xie */ 1582dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1583dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1584dc81cdc5SMiao Xie (fs_info->sb->s_flags & MS_RDONLY))) { 1585dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1586dc81cdc5SMiao Xie } 1587dc81cdc5SMiao Xie 1588dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1589dc81cdc5SMiao Xie } 1590dc81cdc5SMiao Xie 1591c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1592c146afadSYan Zheng { 1593815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1594815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 159549b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 159649b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 159749b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 159849b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 159949b25e05SJeff Mahoney u64 old_alloc_start = fs_info->alloc_start; 160049b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 160149b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1602c146afadSYan Zheng int ret; 1603c146afadSYan Zheng 160402b9984dSTheodore Ts'o sync_filesystem(sb); 1605f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1606dc81cdc5SMiao Xie 1607f667aef6SQu Wenruo if (data) { 1608f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 1609f667aef6SQu Wenruo 1610f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1611f667aef6SQu Wenruo ret = parse_security_options(data, &new_sec_opts); 1612f667aef6SQu Wenruo if (ret) 1613f667aef6SQu Wenruo goto restore; 1614f667aef6SQu Wenruo ret = setup_security_options(fs_info, sb, 1615f667aef6SQu Wenruo &new_sec_opts); 1616f667aef6SQu Wenruo if (ret) { 1617f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1618f667aef6SQu Wenruo goto restore; 1619f667aef6SQu Wenruo } 1620f667aef6SQu Wenruo } 1621f667aef6SQu Wenruo 1622b288052eSChris Mason ret = btrfs_parse_options(root, data); 162349b25e05SJeff Mahoney if (ret) { 162449b25e05SJeff Mahoney ret = -EINVAL; 162549b25e05SJeff Mahoney goto restore; 162649b25e05SJeff Mahoney } 1627b288052eSChris Mason 1628f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 16290d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 16300d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 16310d2450abSSergei Trofimovich 1632c146afadSYan Zheng if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1633dc81cdc5SMiao Xie goto out; 1634c146afadSYan Zheng 1635c146afadSYan Zheng if (*flags & MS_RDONLY) { 16368dabb742SStefan Behrens /* 16378dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 16388dabb742SStefan Behrens * the filesystem is busy. 16398dabb742SStefan Behrens */ 164021c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 1641361c093dSStefan Behrens 1642361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1643361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1644361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1645361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1646361c093dSStefan Behrens 1647c146afadSYan Zheng sb->s_flags |= MS_RDONLY; 1648c146afadSYan Zheng 16498dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 16508dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1651061594efSMiao Xie btrfs_pause_balance(fs_info); 16528dabb742SStefan Behrens 1653c146afadSYan Zheng ret = btrfs_commit_super(root); 165449b25e05SJeff Mahoney if (ret) 165549b25e05SJeff Mahoney goto restore; 1656c146afadSYan Zheng } else { 16576ef3de9cSDavid Sterba if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { 16586ef3de9cSDavid Sterba btrfs_err(fs_info, 1659efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 16606ef3de9cSDavid Sterba ret = -EINVAL; 16616ef3de9cSDavid Sterba goto restore; 16626ef3de9cSDavid Sterba } 16638a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 166449b25e05SJeff Mahoney ret = -EACCES; 166549b25e05SJeff Mahoney goto restore; 16668a3db184SSergei Trofimovich } 16672b82032cSYan Zheng 1668292fd7fcSStefan Behrens if (fs_info->fs_devices->missing_devices > 1669292fd7fcSStefan Behrens fs_info->num_tolerated_disk_barrier_failures && 1670292fd7fcSStefan Behrens !(*flags & MS_RDONLY)) { 1671efe120a0SFrank Holton btrfs_warn(fs_info, 1672efe120a0SFrank Holton "too many missing devices, writeable remount is not allowed"); 1673292fd7fcSStefan Behrens ret = -EACCES; 1674292fd7fcSStefan Behrens goto restore; 1675292fd7fcSStefan Behrens } 1676292fd7fcSStefan Behrens 16778a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 167849b25e05SJeff Mahoney ret = -EINVAL; 167949b25e05SJeff Mahoney goto restore; 16808a3db184SSergei Trofimovich } 1681c146afadSYan Zheng 1682815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 168349b25e05SJeff Mahoney if (ret) 168449b25e05SJeff Mahoney goto restore; 1685c146afadSYan Zheng 1686d68fc57bSYan, Zheng /* recover relocation */ 16875f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 1688d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 16895f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 169049b25e05SJeff Mahoney if (ret) 169149b25e05SJeff Mahoney goto restore; 1692c146afadSYan Zheng 16932b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 16942b6ba629SIlya Dryomov if (ret) 16952b6ba629SIlya Dryomov goto restore; 16962b6ba629SIlya Dryomov 16978dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 16988dabb742SStefan Behrens if (ret) { 1699efe120a0SFrank Holton btrfs_warn(fs_info, "failed to resume dev_replace"); 17008dabb742SStefan Behrens goto restore; 17018dabb742SStefan Behrens } 170294aebfb2SJosef Bacik 170394aebfb2SJosef Bacik if (!fs_info->uuid_root) { 1704efe120a0SFrank Holton btrfs_info(fs_info, "creating UUID tree"); 170594aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 170694aebfb2SJosef Bacik if (ret) { 1707efe120a0SFrank Holton btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); 170894aebfb2SJosef Bacik goto restore; 170994aebfb2SJosef Bacik } 171094aebfb2SJosef Bacik } 1711c146afadSYan Zheng sb->s_flags &= ~MS_RDONLY; 1712c146afadSYan Zheng } 1713dc81cdc5SMiao Xie out: 17142c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 1715dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1716c146afadSYan Zheng return 0; 171749b25e05SJeff Mahoney 171849b25e05SJeff Mahoney restore: 171949b25e05SJeff Mahoney /* We've hit an error - don't reset MS_RDONLY */ 172049b25e05SJeff Mahoney if (sb->s_flags & MS_RDONLY) 172149b25e05SJeff Mahoney old_flags |= MS_RDONLY; 172249b25e05SJeff Mahoney sb->s_flags = old_flags; 172349b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 172449b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 172549b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 1726c018daecSMiao Xie mutex_lock(&fs_info->chunk_mutex); 172749b25e05SJeff Mahoney fs_info->alloc_start = old_alloc_start; 1728c018daecSMiao Xie mutex_unlock(&fs_info->chunk_mutex); 17290d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 17300d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 173149b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1732dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 173349b25e05SJeff Mahoney return ret; 1734c146afadSYan Zheng } 1735c146afadSYan Zheng 1736bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1737bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1738bcd53741SArne Jansen const void *dev_info2) 1739bcd53741SArne Jansen { 1740bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1741bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1742bcd53741SArne Jansen return -1; 1743bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1744bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1745bcd53741SArne Jansen return 1; 1746bcd53741SArne Jansen else 1747bcd53741SArne Jansen return 0; 1748bcd53741SArne Jansen } 1749bcd53741SArne Jansen 1750bcd53741SArne Jansen /* 1751bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1752bcd53741SArne Jansen * is stored.(Descending Sort) 1753bcd53741SArne Jansen */ 1754bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1755bcd53741SArne Jansen struct btrfs_device_info *devices, 1756bcd53741SArne Jansen size_t nr_devices) 1757bcd53741SArne Jansen { 1758bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1759bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1760bcd53741SArne Jansen } 1761bcd53741SArne Jansen 17626d07bcecSMiao Xie /* 17636d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 17646d07bcecSMiao Xie * file data. 17656d07bcecSMiao Xie */ 17666d07bcecSMiao Xie static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 17676d07bcecSMiao Xie { 17686d07bcecSMiao Xie struct btrfs_fs_info *fs_info = root->fs_info; 17696d07bcecSMiao Xie struct btrfs_device_info *devices_info; 17706d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 17716d07bcecSMiao Xie struct btrfs_device *device; 17726d07bcecSMiao Xie u64 skip_space; 17736d07bcecSMiao Xie u64 type; 17746d07bcecSMiao Xie u64 avail_space; 17756d07bcecSMiao Xie u64 used_space; 17766d07bcecSMiao Xie u64 min_stripe_size; 177739fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 17786d07bcecSMiao Xie int i = 0, nr_devices; 17796d07bcecSMiao Xie int ret; 17806d07bcecSMiao Xie 17817e33fd99SJosef Bacik /* 17827e33fd99SJosef Bacik * We aren't under the device list lock, so this is racey-ish, but good 17837e33fd99SJosef Bacik * enough for our purposes. 17847e33fd99SJosef Bacik */ 1785b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 17867e33fd99SJosef Bacik if (!nr_devices) { 17877e33fd99SJosef Bacik smp_mb(); 17887e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 17897e33fd99SJosef Bacik ASSERT(nr_devices); 17907e33fd99SJosef Bacik if (!nr_devices) { 17917e33fd99SJosef Bacik *free_bytes = 0; 17927e33fd99SJosef Bacik return 0; 17937e33fd99SJosef Bacik } 17947e33fd99SJosef Bacik } 17956d07bcecSMiao Xie 1796d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 17976d07bcecSMiao Xie GFP_NOFS); 17986d07bcecSMiao Xie if (!devices_info) 17996d07bcecSMiao Xie return -ENOMEM; 18006d07bcecSMiao Xie 18016d07bcecSMiao Xie /* calc min stripe number for data space alloction */ 18026d07bcecSMiao Xie type = btrfs_get_alloc_profile(root, 1); 180339fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 18046d07bcecSMiao Xie min_stripes = 2; 180539fb26c3SMiao Xie num_stripes = nr_devices; 180639fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 18076d07bcecSMiao Xie min_stripes = 2; 180839fb26c3SMiao Xie num_stripes = 2; 180939fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 18106d07bcecSMiao Xie min_stripes = 4; 181139fb26c3SMiao Xie num_stripes = 4; 181239fb26c3SMiao Xie } 18136d07bcecSMiao Xie 18146d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 18156d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 18166d07bcecSMiao Xie else 18176d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 18186d07bcecSMiao Xie 18197e33fd99SJosef Bacik if (fs_info->alloc_start) 18207e33fd99SJosef Bacik mutex_lock(&fs_devices->device_list_mutex); 18217e33fd99SJosef Bacik rcu_read_lock(); 18227e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 182363a212abSStefan Behrens if (!device->in_fs_metadata || !device->bdev || 182463a212abSStefan Behrens device->is_tgtdev_for_dev_replace) 18256d07bcecSMiao Xie continue; 18266d07bcecSMiao Xie 18277e33fd99SJosef Bacik if (i >= nr_devices) 18287e33fd99SJosef Bacik break; 18297e33fd99SJosef Bacik 18306d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 18316d07bcecSMiao Xie 18326d07bcecSMiao Xie /* align with stripe_len */ 1833f8c269d7SDavid Sterba avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); 18346d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 18356d07bcecSMiao Xie 18366d07bcecSMiao Xie /* 18376d07bcecSMiao Xie * In order to avoid overwritting the superblock on the drive, 18386d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 18396d07bcecSMiao Xie * allocation. 18406d07bcecSMiao Xie */ 18416d07bcecSMiao Xie skip_space = 1024 * 1024; 18426d07bcecSMiao Xie 18436d07bcecSMiao Xie /* user can set the offset in fs_info->alloc_start. */ 18447e33fd99SJosef Bacik if (fs_info->alloc_start && 18457e33fd99SJosef Bacik fs_info->alloc_start + BTRFS_STRIPE_LEN <= 18467e33fd99SJosef Bacik device->total_bytes) { 18477e33fd99SJosef Bacik rcu_read_unlock(); 18486d07bcecSMiao Xie skip_space = max(fs_info->alloc_start, skip_space); 18496d07bcecSMiao Xie 18506d07bcecSMiao Xie /* 18517e33fd99SJosef Bacik * btrfs can not use the free space in 18527e33fd99SJosef Bacik * [0, skip_space - 1], we must subtract it from the 18537e33fd99SJosef Bacik * total. In order to implement it, we account the used 18547e33fd99SJosef Bacik * space in this range first. 18556d07bcecSMiao Xie */ 18567e33fd99SJosef Bacik ret = btrfs_account_dev_extents_size(device, 0, 18577e33fd99SJosef Bacik skip_space - 1, 18586d07bcecSMiao Xie &used_space); 18596d07bcecSMiao Xie if (ret) { 18606d07bcecSMiao Xie kfree(devices_info); 18617e33fd99SJosef Bacik mutex_unlock(&fs_devices->device_list_mutex); 18626d07bcecSMiao Xie return ret; 18636d07bcecSMiao Xie } 18646d07bcecSMiao Xie 18657e33fd99SJosef Bacik rcu_read_lock(); 18667e33fd99SJosef Bacik 18676d07bcecSMiao Xie /* calc the free space in [0, skip_space - 1] */ 18686d07bcecSMiao Xie skip_space -= used_space; 18697e33fd99SJosef Bacik } 18706d07bcecSMiao Xie 18716d07bcecSMiao Xie /* 18726d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 18736d07bcecSMiao Xie * it from the total. 18746d07bcecSMiao Xie */ 18756d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 18766d07bcecSMiao Xie avail_space -= skip_space; 18776d07bcecSMiao Xie else 18786d07bcecSMiao Xie avail_space = 0; 18796d07bcecSMiao Xie 18806d07bcecSMiao Xie if (avail_space < min_stripe_size) 18816d07bcecSMiao Xie continue; 18826d07bcecSMiao Xie 18836d07bcecSMiao Xie devices_info[i].dev = device; 18846d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 18856d07bcecSMiao Xie 18866d07bcecSMiao Xie i++; 18876d07bcecSMiao Xie } 18887e33fd99SJosef Bacik rcu_read_unlock(); 18897e33fd99SJosef Bacik if (fs_info->alloc_start) 18907e33fd99SJosef Bacik mutex_unlock(&fs_devices->device_list_mutex); 18916d07bcecSMiao Xie 18926d07bcecSMiao Xie nr_devices = i; 18936d07bcecSMiao Xie 18946d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 18956d07bcecSMiao Xie 18966d07bcecSMiao Xie i = nr_devices - 1; 18976d07bcecSMiao Xie avail_space = 0; 18986d07bcecSMiao Xie while (nr_devices >= min_stripes) { 189939fb26c3SMiao Xie if (num_stripes > nr_devices) 190039fb26c3SMiao Xie num_stripes = nr_devices; 190139fb26c3SMiao Xie 19026d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 19036d07bcecSMiao Xie int j; 19046d07bcecSMiao Xie u64 alloc_size; 19056d07bcecSMiao Xie 190639fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 19076d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 190839fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 19096d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 19106d07bcecSMiao Xie } 19116d07bcecSMiao Xie i--; 19126d07bcecSMiao Xie nr_devices--; 19136d07bcecSMiao Xie } 19146d07bcecSMiao Xie 19156d07bcecSMiao Xie kfree(devices_info); 19166d07bcecSMiao Xie *free_bytes = avail_space; 19176d07bcecSMiao Xie return 0; 19186d07bcecSMiao Xie } 19196d07bcecSMiao Xie 1920ba7b6e62SDavid Sterba /* 1921ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 1922ba7b6e62SDavid Sterba * 1923ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 1924ba7b6e62SDavid Sterba * multiplier to scale the sizes. 1925ba7b6e62SDavid Sterba * 1926ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 1927ba7b6e62SDavid Sterba * algorithm that respects the device sizes, order of allocations and the 1928ba7b6e62SDavid Sterba * 'alloc_start' value, this is a close approximation of the actual use but 1929ba7b6e62SDavid Sterba * there are other factors that may change the result (like a new metadata 1930ba7b6e62SDavid Sterba * chunk). 1931ba7b6e62SDavid Sterba * 1932ba7b6e62SDavid Sterba * FIXME: not accurate for mixed block groups, total and free/used are ok, 1933ba7b6e62SDavid Sterba * available appears slightly larger. 1934ba7b6e62SDavid Sterba */ 19358fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 19368fd17795SChris Mason { 1937815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 1938815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 1939815745cfSAl Viro struct list_head *head = &fs_info->space_info; 1940bd4d1088SJosef Bacik struct btrfs_space_info *found; 1941bd4d1088SJosef Bacik u64 total_used = 0; 19426d07bcecSMiao Xie u64 total_free_data = 0; 1943db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 1944815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 1945ba7b6e62SDavid Sterba unsigned factor = 1; 1946ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 19476d07bcecSMiao Xie int ret; 19488fd17795SChris Mason 194915484377SMiao Xie /* 195015484377SMiao Xie * holding chunk_muext to avoid allocating new chunks, holding 195115484377SMiao Xie * device_list_mutex to avoid the device being removed 195215484377SMiao Xie */ 1953bd4d1088SJosef Bacik rcu_read_lock(); 195489a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 19556d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 1956ba7b6e62SDavid Sterba int i; 1957ba7b6e62SDavid Sterba 19586d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 19596d07bcecSMiao Xie total_free_data -= 19606d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 1961ba7b6e62SDavid Sterba 1962ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 1963ba7b6e62SDavid Sterba if (!list_empty(&found->block_groups[i])) { 1964ba7b6e62SDavid Sterba switch (i) { 1965ba7b6e62SDavid Sterba case BTRFS_RAID_DUP: 1966ba7b6e62SDavid Sterba case BTRFS_RAID_RAID1: 1967ba7b6e62SDavid Sterba case BTRFS_RAID_RAID10: 1968ba7b6e62SDavid Sterba factor = 2; 1969ba7b6e62SDavid Sterba } 1970ba7b6e62SDavid Sterba } 1971ba7b6e62SDavid Sterba } 19726d07bcecSMiao Xie } 19736d07bcecSMiao Xie 1974b742bb82SYan, Zheng total_used += found->disk_used; 197589a55897SJosef Bacik } 1976ba7b6e62SDavid Sterba 1977bd4d1088SJosef Bacik rcu_read_unlock(); 1978bd4d1088SJosef Bacik 1979ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 1980ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 1981ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 1982ba7b6e62SDavid Sterba 1983ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 1984ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 1985ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 1986ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 1987ba7b6e62SDavid Sterba 19880d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 1989815745cfSAl Viro ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 19907e33fd99SJosef Bacik if (ret) 19916d07bcecSMiao Xie return ret; 1992ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 19936d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 1994d397712bSChris Mason 1995ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 1996ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 1997ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 1998ba7b6e62SDavid Sterba 19999d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 20009d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 20019d03632eSDavid Woodhouse on a big-endian or little-endian host */ 20029d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 20039d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 200432d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 20052b0143b5SDavid Howells buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; 20062b0143b5SDavid Howells buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; 200732d48fa1SDavid Woodhouse 20088fd17795SChris Mason return 0; 20098fd17795SChris Mason } 2010b5133862SChris Mason 2011aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2012aea52e19SAl Viro { 2013815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2014aea52e19SAl Viro kill_anon_super(sb); 2015aea52e19SAl Viro free_fs_info(fs_info); 2016aea52e19SAl Viro } 2017aea52e19SAl Viro 20182e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 20192e635a27SChris Mason .owner = THIS_MODULE, 20202e635a27SChris Mason .name = "btrfs", 2021061dbc6bSAl Viro .mount = btrfs_mount, 2022aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2023f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 20242e635a27SChris Mason }; 20257f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2026a9218f6bSChris Mason 2027d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2028d8620958STom Van Braeckel { 2029d8620958STom Van Braeckel /* 2030d8620958STom Van Braeckel * The control file's private_data is used to hold the 2031d8620958STom Van Braeckel * transaction when it is started and is used to keep 2032d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2033d8620958STom Van Braeckel */ 2034d8620958STom Van Braeckel file->private_data = NULL; 2035d8620958STom Van Braeckel return 0; 2036d8620958STom Van Braeckel } 2037d8620958STom Van Braeckel 2038d352ac68SChris Mason /* 2039d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 2040d352ac68SChris Mason */ 20418a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 20428a4b83ccSChris Mason unsigned long arg) 20438a4b83ccSChris Mason { 20448a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 20458a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 2046c071fcfdSChris Mason int ret = -ENOTTY; 20478a4b83ccSChris Mason 2048e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2049e441d54dSChris Mason return -EPERM; 2050e441d54dSChris Mason 2051dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2052dae7b665SLi Zefan if (IS_ERR(vol)) 2053dae7b665SLi Zefan return PTR_ERR(vol); 2054c071fcfdSChris Mason 20558a4b83ccSChris Mason switch (cmd) { 20568a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 205797288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 20588a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 20598a4b83ccSChris Mason break; 206002db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 206102db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 206202db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 206302db0844SJosef Bacik if (ret) 206402db0844SJosef Bacik break; 206502db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 206602db0844SJosef Bacik break; 20678a4b83ccSChris Mason } 2068dae7b665SLi Zefan 20698a4b83ccSChris Mason kfree(vol); 2070f819d837SLinda Knippers return ret; 20718a4b83ccSChris Mason } 20728a4b83ccSChris Mason 20730176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2074ed0dab6bSYan { 2075354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 2076354aa0fbSMiao Xie struct btrfs_root *root = btrfs_sb(sb)->tree_root; 2077354aa0fbSMiao Xie 2078d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2079354aa0fbSMiao Xie if (IS_ERR(trans)) { 2080354aa0fbSMiao Xie /* no transaction, don't bother */ 2081354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 20820176260fSLinus Torvalds return 0; 2083354aa0fbSMiao Xie return PTR_ERR(trans); 2084354aa0fbSMiao Xie } 2085354aa0fbSMiao Xie return btrfs_commit_transaction(trans, root); 2086ed0dab6bSYan } 2087ed0dab6bSYan 20889c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 20899c5085c1SJosef Bacik { 20909c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 20919c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 20929c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 20939c5085c1SJosef Bacik struct list_head *head; 20949c5085c1SJosef Bacik struct rcu_string *name; 20959c5085c1SJosef Bacik 20969c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 20979c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 20989c5085c1SJosef Bacik while (cur_devices) { 20999c5085c1SJosef Bacik head = &cur_devices->devices; 21009c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 2101aa9ddcd4SJosef Bacik if (dev->missing) 2102aa9ddcd4SJosef Bacik continue; 21030aeb8a6eSAnand Jain if (!dev->name) 21040aeb8a6eSAnand Jain continue; 21059c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 21069c5085c1SJosef Bacik first_dev = dev; 21079c5085c1SJosef Bacik } 21089c5085c1SJosef Bacik cur_devices = cur_devices->seed; 21099c5085c1SJosef Bacik } 21109c5085c1SJosef Bacik 21119c5085c1SJosef Bacik if (first_dev) { 21129c5085c1SJosef Bacik rcu_read_lock(); 21139c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 21149c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 21159c5085c1SJosef Bacik rcu_read_unlock(); 21169c5085c1SJosef Bacik } else { 21179c5085c1SJosef Bacik WARN_ON(1); 21189c5085c1SJosef Bacik } 21199c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 21209c5085c1SJosef Bacik return 0; 21219c5085c1SJosef Bacik } 21229c5085c1SJosef Bacik 2123b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 212476dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2125bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2126e20d96d6SChris Mason .put_super = btrfs_put_super, 2127d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2128a9572a15SEric Paris .show_options = btrfs_show_options, 21299c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 21304730a4bcSChris Mason .write_inode = btrfs_write_inode, 21312c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 21322c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 21338fd17795SChris Mason .statfs = btrfs_statfs, 2134c146afadSYan Zheng .remount_fs = btrfs_remount, 21350176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 2136e20d96d6SChris Mason }; 2137a9218f6bSChris Mason 2138a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2139d8620958STom Van Braeckel .open = btrfs_control_open, 2140a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 2141a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 2142a9218f6bSChris Mason .owner = THIS_MODULE, 21436038f373SArnd Bergmann .llseek = noop_llseek, 2144a9218f6bSChris Mason }; 2145a9218f6bSChris Mason 2146a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2147578454ffSKay Sievers .minor = BTRFS_MINOR, 2148a9218f6bSChris Mason .name = "btrfs-control", 2149a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2150a9218f6bSChris Mason }; 2151a9218f6bSChris Mason 2152578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2153578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2154578454ffSKay Sievers 2155a9218f6bSChris Mason static int btrfs_interface_init(void) 2156a9218f6bSChris Mason { 2157a9218f6bSChris Mason return misc_register(&btrfs_misc); 2158a9218f6bSChris Mason } 2159a9218f6bSChris Mason 2160b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 2161a9218f6bSChris Mason { 2162a9218f6bSChris Mason if (misc_deregister(&btrfs_misc) < 0) 2163efe120a0SFrank Holton printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n"); 2164a9218f6bSChris Mason } 2165a9218f6bSChris Mason 216685965600SDavid Sterba static void btrfs_print_info(void) 216785965600SDavid Sterba { 216885965600SDavid Sterba printk(KERN_INFO "Btrfs loaded" 216985965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 217085965600SDavid Sterba ", debug=on" 217185965600SDavid Sterba #endif 217279556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 217379556c3dSStefan Behrens ", assert=on" 217479556c3dSStefan Behrens #endif 217585965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 217685965600SDavid Sterba ", integrity-checker=on" 217785965600SDavid Sterba #endif 217885965600SDavid Sterba "\n"); 217985965600SDavid Sterba } 218085965600SDavid Sterba 2181dc11dd5dSJosef Bacik static int btrfs_run_sanity_tests(void) 2182dc11dd5dSJosef Bacik { 218306ea65a3SJosef Bacik int ret; 218406ea65a3SJosef Bacik 2185294e30feSJosef Bacik ret = btrfs_init_test_fs(); 218606ea65a3SJosef Bacik if (ret) 218706ea65a3SJosef Bacik return ret; 2188294e30feSJosef Bacik 2189294e30feSJosef Bacik ret = btrfs_test_free_space_cache(); 2190294e30feSJosef Bacik if (ret) 2191294e30feSJosef Bacik goto out; 2192294e30feSJosef Bacik ret = btrfs_test_extent_buffer_operations(); 2193294e30feSJosef Bacik if (ret) 2194294e30feSJosef Bacik goto out; 2195294e30feSJosef Bacik ret = btrfs_test_extent_io(); 2196aaedb55bSJosef Bacik if (ret) 2197aaedb55bSJosef Bacik goto out; 2198aaedb55bSJosef Bacik ret = btrfs_test_inodes(); 2199faa2dbf0SJosef Bacik if (ret) 2200faa2dbf0SJosef Bacik goto out; 2201faa2dbf0SJosef Bacik ret = btrfs_test_qgroups(); 2202294e30feSJosef Bacik out: 2203294e30feSJosef Bacik btrfs_destroy_test_fs(); 2204294e30feSJosef Bacik return ret; 2205dc11dd5dSJosef Bacik } 2206dc11dd5dSJosef Bacik 22072e635a27SChris Mason static int __init init_btrfs_fs(void) 22082e635a27SChris Mason { 22092c90e5d6SChris Mason int err; 221058176a96SJosef Bacik 221114a958e6SFilipe David Borba Manana err = btrfs_hash_init(); 221214a958e6SFilipe David Borba Manana if (err) 221314a958e6SFilipe David Borba Manana return err; 221414a958e6SFilipe David Borba Manana 221563541927SFilipe David Borba Manana btrfs_props_init(); 221663541927SFilipe David Borba Manana 221758176a96SJosef Bacik err = btrfs_init_sysfs(); 221858176a96SJosef Bacik if (err) 221914a958e6SFilipe David Borba Manana goto free_hash; 222058176a96SJosef Bacik 2221143bede5SJeff Mahoney btrfs_init_compress(); 2222d1310b2eSChris Mason 2223261507a0SLi Zefan err = btrfs_init_cachep(); 2224261507a0SLi Zefan if (err) 2225261507a0SLi Zefan goto free_compress; 2226261507a0SLi Zefan 2227d1310b2eSChris Mason err = extent_io_init(); 22282f4cbe64SWyatt Banks if (err) 22292f4cbe64SWyatt Banks goto free_cachep; 22302f4cbe64SWyatt Banks 2231d1310b2eSChris Mason err = extent_map_init(); 2232d1310b2eSChris Mason if (err) 2233d1310b2eSChris Mason goto free_extent_io; 2234d1310b2eSChris Mason 22356352b91dSMiao Xie err = ordered_data_init(); 22362f4cbe64SWyatt Banks if (err) 22372f4cbe64SWyatt Banks goto free_extent_map; 2238c8b97818SChris Mason 22396352b91dSMiao Xie err = btrfs_delayed_inode_init(); 22406352b91dSMiao Xie if (err) 22416352b91dSMiao Xie goto free_ordered_data; 22426352b91dSMiao Xie 22439247f317SMiao Xie err = btrfs_auto_defrag_init(); 224416cdcec7SMiao Xie if (err) 224516cdcec7SMiao Xie goto free_delayed_inode; 224616cdcec7SMiao Xie 224778a6184aSMiao Xie err = btrfs_delayed_ref_init(); 22489247f317SMiao Xie if (err) 22499247f317SMiao Xie goto free_auto_defrag; 22509247f317SMiao Xie 2251b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2252b9e9a6cbSWang Shilong if (err) 2253af13b492SDavid Sterba goto free_delayed_ref; 2254b9e9a6cbSWang Shilong 225597eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 225678a6184aSMiao Xie if (err) 2257af13b492SDavid Sterba goto free_prelim_ref; 225878a6184aSMiao Xie 225997eb6b69SDavid Sterba err = btrfs_interface_init(); 226097eb6b69SDavid Sterba if (err) 226197eb6b69SDavid Sterba goto free_end_io_wq; 226297eb6b69SDavid Sterba 2263e565d4b9SJan Schmidt btrfs_init_lockdep(); 2264e565d4b9SJan Schmidt 226585965600SDavid Sterba btrfs_print_info(); 2266dc11dd5dSJosef Bacik 2267dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2268dc11dd5dSJosef Bacik if (err) 2269dc11dd5dSJosef Bacik goto unregister_ioctl; 2270dc11dd5dSJosef Bacik 2271dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2272dc11dd5dSJosef Bacik if (err) 2273dc11dd5dSJosef Bacik goto unregister_ioctl; 227474255aa0SJosef Bacik 22752f4cbe64SWyatt Banks return 0; 22762f4cbe64SWyatt Banks 2277a9218f6bSChris Mason unregister_ioctl: 2278a9218f6bSChris Mason btrfs_interface_exit(); 227997eb6b69SDavid Sterba free_end_io_wq: 228097eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2281b9e9a6cbSWang Shilong free_prelim_ref: 2282b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 228378a6184aSMiao Xie free_delayed_ref: 228478a6184aSMiao Xie btrfs_delayed_ref_exit(); 22859247f317SMiao Xie free_auto_defrag: 22869247f317SMiao Xie btrfs_auto_defrag_exit(); 228716cdcec7SMiao Xie free_delayed_inode: 228816cdcec7SMiao Xie btrfs_delayed_inode_exit(); 22896352b91dSMiao Xie free_ordered_data: 22906352b91dSMiao Xie ordered_data_exit(); 22912f4cbe64SWyatt Banks free_extent_map: 22922f4cbe64SWyatt Banks extent_map_exit(); 2293d1310b2eSChris Mason free_extent_io: 2294d1310b2eSChris Mason extent_io_exit(); 22952f4cbe64SWyatt Banks free_cachep: 22962f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2297261507a0SLi Zefan free_compress: 2298261507a0SLi Zefan btrfs_exit_compress(); 22992f4cbe64SWyatt Banks btrfs_exit_sysfs(); 230014a958e6SFilipe David Borba Manana free_hash: 230114a958e6SFilipe David Borba Manana btrfs_hash_exit(); 23022c90e5d6SChris Mason return err; 23032e635a27SChris Mason } 23042e635a27SChris Mason 23052e635a27SChris Mason static void __exit exit_btrfs_fs(void) 23062e635a27SChris Mason { 230739279cc3SChris Mason btrfs_destroy_cachep(); 230878a6184aSMiao Xie btrfs_delayed_ref_exit(); 23099247f317SMiao Xie btrfs_auto_defrag_exit(); 231016cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2311b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 23126352b91dSMiao Xie ordered_data_exit(); 2313a52d9a80SChris Mason extent_map_exit(); 2314d1310b2eSChris Mason extent_io_exit(); 2315a9218f6bSChris Mason btrfs_interface_exit(); 23165ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 23172e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 231858176a96SJosef Bacik btrfs_exit_sysfs(); 23198a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2320261507a0SLi Zefan btrfs_exit_compress(); 232114a958e6SFilipe David Borba Manana btrfs_hash_exit(); 23222e635a27SChris Mason } 23232e635a27SChris Mason 232460efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 23252e635a27SChris Mason module_exit(exit_btrfs_fs) 23262e635a27SChris Mason 23272e635a27SChris Mason MODULE_LICENSE("GPL"); 2328