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" 515103e947SJosef Bacik #include "xattr.h" 528a4b83ccSChris Mason #include "volumes.h" 53be6e8dc0SBalaji Rao #include "export.h" 54c8b97818SChris Mason #include "compression.h" 559c5085c1SJosef Bacik #include "rcu-string.h" 568dabb742SStefan Behrens #include "dev-replace.h" 5774255aa0SJosef Bacik #include "free-space-cache.h" 58b9e9a6cbSWang Shilong #include "backref.h" 59dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 602e635a27SChris Mason 611abe9b8aSliubo #define CREATE_TRACE_POINTS 621abe9b8aSliubo #include <trace/events/btrfs.h> 631abe9b8aSliubo 64b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 65830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 66e20d96d6SChris Mason 6708748810SDavid Sterba static const char *btrfs_decode_error(int errno) 68acce952bSliubo { 6908748810SDavid Sterba char *errstr = "unknown"; 70acce952bSliubo 71acce952bSliubo switch (errno) { 72acce952bSliubo case -EIO: 73acce952bSliubo errstr = "IO failure"; 74acce952bSliubo break; 75acce952bSliubo case -ENOMEM: 76acce952bSliubo errstr = "Out of memory"; 77acce952bSliubo break; 78acce952bSliubo case -EROFS: 79acce952bSliubo errstr = "Readonly filesystem"; 80acce952bSliubo break; 818c342930SJeff Mahoney case -EEXIST: 828c342930SJeff Mahoney errstr = "Object already exists"; 838c342930SJeff Mahoney break; 8494ef7280SDavid Sterba case -ENOSPC: 8594ef7280SDavid Sterba errstr = "No space left"; 8694ef7280SDavid Sterba break; 8794ef7280SDavid Sterba case -ENOENT: 8894ef7280SDavid Sterba errstr = "No such entry"; 8994ef7280SDavid Sterba break; 90acce952bSliubo } 91acce952bSliubo 92acce952bSliubo return errstr; 93acce952bSliubo } 94acce952bSliubo 95bbece8a3SDavid Sterba static void save_error_info(struct btrfs_fs_info *fs_info) 96acce952bSliubo { 97acce952bSliubo /* 98acce952bSliubo * today we only save the error info into ram. Long term we'll 99acce952bSliubo * also send it down to the disk 100acce952bSliubo */ 10187533c47SMiao Xie set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 102acce952bSliubo } 103acce952bSliubo 104acce952bSliubo /* btrfs handle error by forcing the filesystem readonly */ 105acce952bSliubo static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 106acce952bSliubo { 107acce952bSliubo struct super_block *sb = fs_info->sb; 108acce952bSliubo 109acce952bSliubo if (sb->s_flags & MS_RDONLY) 110acce952bSliubo return; 111acce952bSliubo 11287533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 113acce952bSliubo sb->s_flags |= MS_RDONLY; 114c2cf52ebSSimon Kirby btrfs_info(fs_info, "forced readonly"); 1151acd6831SStefan Behrens /* 1161acd6831SStefan Behrens * Note that a running device replace operation is not 1171acd6831SStefan Behrens * canceled here although there is no way to update 1181acd6831SStefan Behrens * the progress. It would add the risk of a deadlock, 1191acd6831SStefan Behrens * therefore the canceling is ommited. The only penalty 1201acd6831SStefan Behrens * is that some I/O remains active until the procedure 1211acd6831SStefan Behrens * completes. The next time when the filesystem is 1221acd6831SStefan Behrens * mounted writeable again, the device replace 1231acd6831SStefan Behrens * operation continues. 1241acd6831SStefan Behrens */ 125acce952bSliubo } 126acce952bSliubo } 127acce952bSliubo 128533574c6SJoe Perches #ifdef CONFIG_PRINTK 129acce952bSliubo /* 130acce952bSliubo * __btrfs_std_error decodes expected errors from the caller and 131acce952bSliubo * invokes the approciate error response. 132acce952bSliubo */ 133acce952bSliubo void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 1344da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 135acce952bSliubo { 136acce952bSliubo struct super_block *sb = fs_info->sb; 137acce952bSliubo const char *errstr; 138acce952bSliubo 139acce952bSliubo /* 140acce952bSliubo * Special case: if the error is EROFS, and we're already 141acce952bSliubo * under MS_RDONLY, then it is safe here. 142acce952bSliubo */ 143acce952bSliubo if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 144acce952bSliubo return; 145acce952bSliubo 14608748810SDavid Sterba errstr = btrfs_decode_error(errno); 1474da35113SJeff Mahoney if (fmt) { 14837252a66SEric Sandeen struct va_format vaf; 14937252a66SEric Sandeen va_list args; 15037252a66SEric Sandeen 15137252a66SEric Sandeen va_start(args, fmt); 15237252a66SEric Sandeen vaf.fmt = fmt; 15337252a66SEric Sandeen vaf.va = &args; 1544da35113SJeff Mahoney 15508748810SDavid Sterba printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s (%pV)\n", 15608748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 15737252a66SEric Sandeen va_end(args); 1584da35113SJeff Mahoney } else { 15908748810SDavid Sterba printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s\n", 16008748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1614da35113SJeff Mahoney } 162acce952bSliubo 1634da35113SJeff Mahoney /* Don't go through full error handling during mount */ 1644da35113SJeff Mahoney save_error_info(fs_info); 165cf79ffb5SJosef Bacik if (sb->s_flags & MS_BORN) 166acce952bSliubo btrfs_handle_error(fs_info); 167acce952bSliubo } 1684da35113SJeff Mahoney 169533574c6SJoe Perches static const char * const logtypes[] = { 1704da35113SJeff Mahoney "emergency", 1714da35113SJeff Mahoney "alert", 1724da35113SJeff Mahoney "critical", 1734da35113SJeff Mahoney "error", 1744da35113SJeff Mahoney "warning", 1754da35113SJeff Mahoney "notice", 1764da35113SJeff Mahoney "info", 1774da35113SJeff Mahoney "debug", 1784da35113SJeff Mahoney }; 1794da35113SJeff Mahoney 180c2cf52ebSSimon Kirby void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 1814da35113SJeff Mahoney { 1824da35113SJeff Mahoney struct super_block *sb = fs_info->sb; 1834da35113SJeff Mahoney char lvl[4]; 1844da35113SJeff Mahoney struct va_format vaf; 1854da35113SJeff Mahoney va_list args; 1864da35113SJeff Mahoney const char *type = logtypes[4]; 187533574c6SJoe Perches int kern_level; 1884da35113SJeff Mahoney 1894da35113SJeff Mahoney va_start(args, fmt); 1904da35113SJeff Mahoney 191533574c6SJoe Perches kern_level = printk_get_level(fmt); 192533574c6SJoe Perches if (kern_level) { 193533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 194533574c6SJoe Perches memcpy(lvl, fmt, size); 195533574c6SJoe Perches lvl[size] = '\0'; 196533574c6SJoe Perches fmt += size; 197533574c6SJoe Perches type = logtypes[kern_level - '0']; 1984da35113SJeff Mahoney } else 1994da35113SJeff Mahoney *lvl = '\0'; 2004da35113SJeff Mahoney 2014da35113SJeff Mahoney vaf.fmt = fmt; 2024da35113SJeff Mahoney vaf.va = &args; 203533574c6SJoe Perches 204c2cf52ebSSimon Kirby printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); 205533574c6SJoe Perches 206533574c6SJoe Perches va_end(args); 2074da35113SJeff Mahoney } 208acce952bSliubo 209533574c6SJoe Perches #else 210533574c6SJoe Perches 211533574c6SJoe Perches void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 212533574c6SJoe Perches unsigned int line, int errno, const char *fmt, ...) 213533574c6SJoe Perches { 214533574c6SJoe Perches struct super_block *sb = fs_info->sb; 215533574c6SJoe Perches 216533574c6SJoe Perches /* 217533574c6SJoe Perches * Special case: if the error is EROFS, and we're already 218533574c6SJoe Perches * under MS_RDONLY, then it is safe here. 219533574c6SJoe Perches */ 220533574c6SJoe Perches if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 221533574c6SJoe Perches return; 222533574c6SJoe Perches 223533574c6SJoe Perches /* Don't go through full error handling during mount */ 224533574c6SJoe Perches if (sb->s_flags & MS_BORN) { 225533574c6SJoe Perches save_error_info(fs_info); 226533574c6SJoe Perches btrfs_handle_error(fs_info); 227533574c6SJoe Perches } 228533574c6SJoe Perches } 229533574c6SJoe Perches #endif 230533574c6SJoe Perches 2318c342930SJeff Mahoney /* 23249b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 23349b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 23449b25e05SJeff Mahoney * one. 23549b25e05SJeff Mahoney * 23649b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 23749b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 23849b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 23949b25e05SJeff Mahoney * in the call path but will return -EIO. 24049b25e05SJeff Mahoney * 24149b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 24249b25e05SJeff Mahoney * btrfs_commit_transaction. 24349b25e05SJeff Mahoney */ 24449b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 24549b25e05SJeff Mahoney struct btrfs_root *root, const char *function, 24649b25e05SJeff Mahoney unsigned int line, int errno) 24749b25e05SJeff Mahoney { 24808748810SDavid Sterba /* 24908748810SDavid Sterba * Report first abort since mount 25008748810SDavid Sterba */ 25108748810SDavid Sterba if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, 25208748810SDavid Sterba &root->fs_info->fs_state)) { 25308748810SDavid Sterba WARN(1, KERN_DEBUG "btrfs: Transaction aborted (error %d)\n", 25408748810SDavid Sterba errno); 25508748810SDavid Sterba } 25649b25e05SJeff Mahoney trans->aborted = errno; 25749b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 25849b25e05SJeff Mahoney * transaction may be able to continue. */ 25949b25e05SJeff Mahoney if (!trans->blocks_used) { 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 */ 2788c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2798c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2808c342930SJeff Mahoney { 2818c342930SJeff Mahoney char *s_id = "<unknown>"; 2828c342930SJeff Mahoney const char *errstr; 2838c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2848c342930SJeff Mahoney va_list args; 2858c342930SJeff Mahoney 2868c342930SJeff Mahoney if (fs_info) 2878c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2888c342930SJeff Mahoney 2898c342930SJeff Mahoney va_start(args, fmt); 2908c342930SJeff Mahoney vaf.va = &args; 2918c342930SJeff Mahoney 29208748810SDavid Sterba errstr = btrfs_decode_error(errno); 293aa43a17cSEric Sandeen if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) 29408748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 29508748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 2968c342930SJeff Mahoney 29708748810SDavid Sterba printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 29808748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 2998c342930SJeff Mahoney va_end(args); 3008c342930SJeff Mahoney /* Caller calls BUG() */ 3018c342930SJeff Mahoney } 302e20d96d6SChris Mason 303e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 304e20d96d6SChris Mason { 305815745cfSAl Viro (void)close_ctree(btrfs_sb(sb)->tree_root); 306aea52e19SAl Viro /* FIXME: need to fix VFS to return error? */ 307aea52e19SAl Viro /* AV: return it _where_? ->put_super() can be triggered by any number 308aea52e19SAl Viro * of async events, up to and including delivery of SIGKILL to the 309aea52e19SAl Viro * last process that kept it busy. Or segfault in the aforementioned 310aea52e19SAl Viro * process... Whom would you report that to? 311aea52e19SAl Viro */ 312e20d96d6SChris Mason } 3132e635a27SChris Mason 31495e05289SChris Mason enum { 31573f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 316287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 317287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 318261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 319261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 32091435650SChris Mason Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, 3219555c6c1SIlya Dryomov Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, 3229555c6c1SIlya Dryomov Opt_no_space_cache, Opt_recovery, Opt_skip_balance, 32321adbd5cSStefan Behrens Opt_check_integrity, Opt_check_integrity_including_extent_data, 324f420ee1eSStefan Behrens Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, 3258b87dc17SDavid Sterba Opt_commit_interval, 3269555c6c1SIlya Dryomov Opt_err, 32795e05289SChris Mason }; 32895e05289SChris Mason 32995e05289SChris Mason static match_table_t tokens = { 330dfe25020SChris Mason {Opt_degraded, "degraded"}, 33195e05289SChris Mason {Opt_subvol, "subvol=%s"}, 3321493381fSWang Shilong {Opt_subvolid, "subvolid=%s"}, 33343e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 334b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 335be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 33621ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 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"}, 34733268eafSJosef Bacik {Opt_noacl, "noacl"}, 3483a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 349dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 35097e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 351e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 3520af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 35388c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3544260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 35591435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 356e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3574cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 3584b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3598965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 360af31f5e5SChris Mason {Opt_recovery, "recovery"}, 3619555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 36221adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 36321adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 36421adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 365f420ee1eSStefan Behrens {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 3668c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 3678b87dc17SDavid Sterba {Opt_commit_interval, "commit=%d"}, 36833268eafSJosef Bacik {Opt_err, NULL}, 36995e05289SChris Mason }; 37095e05289SChris Mason 371edf24abeSChristoph Hellwig /* 372edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 373edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 37449b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 375edf24abeSChristoph Hellwig */ 376edf24abeSChristoph Hellwig int btrfs_parse_options(struct btrfs_root *root, char *options) 37795e05289SChris Mason { 378edf24abeSChristoph Hellwig struct btrfs_fs_info *info = root->fs_info; 37995e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 38073bc1876SJosef Bacik char *p, *num, *orig = NULL; 38173bc1876SJosef Bacik u64 cache_gen; 3824543df7eSChris Mason int intarg; 383a7a3f7caSSage Weil int ret = 0; 384261507a0SLi Zefan char *compress_type; 385261507a0SLi Zefan bool compress_force = false; 386b6cda9bcSChris Mason 3876c41761fSDavid Sterba cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 38873bc1876SJosef Bacik if (cache_gen) 38973bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 39073bc1876SJosef Bacik 39195e05289SChris Mason if (!options) 39273bc1876SJosef Bacik goto out; 39395e05289SChris Mason 394be20aa9dSChris Mason /* 395be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 396be20aa9dSChris Mason * gets called twice 397be20aa9dSChris Mason */ 398be20aa9dSChris Mason options = kstrdup(options, GFP_NOFS); 399be20aa9dSChris Mason if (!options) 400be20aa9dSChris Mason return -ENOMEM; 401be20aa9dSChris Mason 402da495eccSJosef Bacik orig = options; 403be20aa9dSChris Mason 40495e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 40595e05289SChris Mason int token; 40695e05289SChris Mason if (!*p) 40795e05289SChris Mason continue; 40895e05289SChris Mason 40995e05289SChris Mason token = match_token(p, tokens, args); 41095e05289SChris Mason switch (token) { 411dfe25020SChris Mason case Opt_degraded: 412edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: allowing degraded mounts\n"); 413dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 414dfe25020SChris Mason break; 41595e05289SChris Mason case Opt_subvol: 41673f73415SJosef Bacik case Opt_subvolid: 417e15d0542SXin Zhong case Opt_subvolrootid: 41843e570b0SChristoph Hellwig case Opt_device: 419edf24abeSChristoph Hellwig /* 42043e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 421edf24abeSChristoph Hellwig * and can be happily ignored here. 422edf24abeSChristoph Hellwig */ 42395e05289SChris Mason break; 424b6cda9bcSChris Mason case Opt_nodatasum: 425067c28adSChris Mason printk(KERN_INFO "btrfs: setting nodatasum\n"); 426b6cda9bcSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 427be20aa9dSChris Mason break; 428be20aa9dSChris Mason case Opt_nodatacow: 429bedb2ccaSAndrei Popa if (!btrfs_test_opt(root, COMPRESS) || 430bedb2ccaSAndrei Popa !btrfs_test_opt(root, FORCE_COMPRESS)) { 431bedb2ccaSAndrei Popa printk(KERN_INFO "btrfs: setting nodatacow, compression disabled\n"); 432bedb2ccaSAndrei Popa } else { 433edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: setting nodatacow\n"); 434bedb2ccaSAndrei Popa } 435bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 436bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 437be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 438be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 439b6cda9bcSChris Mason break; 440a555f810SChris Mason case Opt_compress_force: 441261507a0SLi Zefan case Opt_compress_force_type: 442261507a0SLi Zefan compress_force = true; 4431c697d4aSEric Sandeen /* Fallthrough */ 444261507a0SLi Zefan case Opt_compress: 445261507a0SLi Zefan case Opt_compress_type: 446261507a0SLi Zefan if (token == Opt_compress || 447261507a0SLi Zefan token == Opt_compress_force || 448261507a0SLi Zefan strcmp(args[0].from, "zlib") == 0) { 449261507a0SLi Zefan compress_type = "zlib"; 450261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 451063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 452bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 453bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 454a6fa6faeSLi Zefan } else if (strcmp(args[0].from, "lzo") == 0) { 455a6fa6faeSLi Zefan compress_type = "lzo"; 456a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 457063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 458bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 459bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 4602b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 461063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 462063849eaSArnd Hannemann compress_type = "no"; 463063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 464063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 465063849eaSArnd Hannemann compress_force = false; 466261507a0SLi Zefan } else { 467261507a0SLi Zefan ret = -EINVAL; 468261507a0SLi Zefan goto out; 469261507a0SLi Zefan } 470261507a0SLi Zefan 471261507a0SLi Zefan if (compress_force) { 472261507a0SLi Zefan btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 473261507a0SLi Zefan pr_info("btrfs: force %s compression\n", 474261507a0SLi Zefan compress_type); 475*a7e252afSMiao Xie } else if (btrfs_test_opt(root, COMPRESS)) { 476261507a0SLi Zefan pr_info("btrfs: use %s compression\n", 477261507a0SLi Zefan compress_type); 478*a7e252afSMiao Xie } 479a555f810SChris Mason break; 480e18e4809SChris Mason case Opt_ssd: 481edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); 482e18e4809SChris Mason btrfs_set_opt(info->mount_opt, SSD); 483e18e4809SChris Mason break; 484451d7585SChris Mason case Opt_ssd_spread: 485451d7585SChris Mason printk(KERN_INFO "btrfs: use spread ssd " 486451d7585SChris Mason "allocation scheme\n"); 487451d7585SChris Mason btrfs_set_opt(info->mount_opt, SSD); 488451d7585SChris Mason btrfs_set_opt(info->mount_opt, SSD_SPREAD); 489451d7585SChris Mason break; 4903b30c22fSChris Mason case Opt_nossd: 491451d7585SChris Mason printk(KERN_INFO "btrfs: not using ssd allocation " 492451d7585SChris Mason "scheme\n"); 493c289811cSChris Mason btrfs_set_opt(info->mount_opt, NOSSD); 4943b30c22fSChris Mason btrfs_clear_opt(info->mount_opt, SSD); 495451d7585SChris Mason btrfs_clear_opt(info->mount_opt, SSD_SPREAD); 4963b30c22fSChris Mason break; 49721ad10cfSChris Mason case Opt_nobarrier: 498edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: turning off barriers\n"); 49921ad10cfSChris Mason btrfs_set_opt(info->mount_opt, NOBARRIER); 50021ad10cfSChris Mason break; 5014543df7eSChris Mason case Opt_thread_pool: 5022c334e87SWang Shilong ret = match_int(&args[0], &intarg); 5032c334e87SWang Shilong if (ret) { 5042c334e87SWang Shilong goto out; 5052c334e87SWang Shilong } else if (intarg > 0) { 5064543df7eSChris Mason info->thread_pool_size = intarg; 5072c334e87SWang Shilong } else { 5082c334e87SWang Shilong ret = -EINVAL; 5092c334e87SWang Shilong goto out; 5102c334e87SWang Shilong } 5114543df7eSChris Mason break; 5126f568d35SChris Mason case Opt_max_inline: 513edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5146f568d35SChris Mason if (num) { 51591748467SAkinobu Mita info->max_inline = memparse(num, NULL); 5166f568d35SChris Mason kfree(num); 5176f568d35SChris Mason 51815ada040SChris Mason if (info->max_inline) { 5196f568d35SChris Mason info->max_inline = max_t(u64, 52015ada040SChris Mason info->max_inline, 52115ada040SChris Mason root->sectorsize); 52215ada040SChris Mason } 523edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: max_inline at %llu\n", 524c1c9ff7cSGeert Uytterhoeven info->max_inline); 5252c334e87SWang Shilong } else { 5262c334e87SWang Shilong ret = -ENOMEM; 5272c334e87SWang Shilong goto out; 5286f568d35SChris Mason } 5296f568d35SChris Mason break; 5308f662a76SChris Mason case Opt_alloc_start: 531edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5328f662a76SChris Mason if (num) { 533c018daecSMiao Xie mutex_lock(&info->chunk_mutex); 53491748467SAkinobu Mita info->alloc_start = memparse(num, NULL); 535c018daecSMiao Xie mutex_unlock(&info->chunk_mutex); 5368f662a76SChris Mason kfree(num); 537edf24abeSChristoph Hellwig printk(KERN_INFO 538edf24abeSChristoph Hellwig "btrfs: allocations start at %llu\n", 539c1c9ff7cSGeert Uytterhoeven info->alloc_start); 5402c334e87SWang Shilong } else { 5412c334e87SWang Shilong ret = -ENOMEM; 5422c334e87SWang Shilong goto out; 5438f662a76SChris Mason } 5448f662a76SChris Mason break; 54533268eafSJosef Bacik case Opt_noacl: 54633268eafSJosef Bacik root->fs_info->sb->s_flags &= ~MS_POSIXACL; 54733268eafSJosef Bacik break; 5483a5e1404SSage Weil case Opt_notreelog: 5493a5e1404SSage Weil printk(KERN_INFO "btrfs: disabling tree log\n"); 5503a5e1404SSage Weil btrfs_set_opt(info->mount_opt, NOTREELOG); 5513a5e1404SSage Weil break; 552dccae999SSage Weil case Opt_flushoncommit: 553dccae999SSage Weil printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); 554dccae999SSage Weil btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); 555dccae999SSage Weil break; 55697e728d4SJosef Bacik case Opt_ratio: 5572c334e87SWang Shilong ret = match_int(&args[0], &intarg); 5582c334e87SWang Shilong if (ret) { 5592c334e87SWang Shilong goto out; 5602c334e87SWang Shilong } else if (intarg >= 0) { 56197e728d4SJosef Bacik info->metadata_ratio = intarg; 56297e728d4SJosef Bacik printk(KERN_INFO "btrfs: metadata ratio %d\n", 56397e728d4SJosef Bacik info->metadata_ratio); 5642c334e87SWang Shilong } else { 5652c334e87SWang Shilong ret = -EINVAL; 5662c334e87SWang Shilong goto out; 56797e728d4SJosef Bacik } 56897e728d4SJosef Bacik break; 569e244a0aeSChristoph Hellwig case Opt_discard: 570e244a0aeSChristoph Hellwig btrfs_set_opt(info->mount_opt, DISCARD); 571e244a0aeSChristoph Hellwig break; 5720af3d00bSJosef Bacik case Opt_space_cache: 5730af3d00bSJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 5740de90876SJosef Bacik break; 575f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 576f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 577f420ee1eSStefan Behrens break; 57873bc1876SJosef Bacik case Opt_no_space_cache: 57973bc1876SJosef Bacik printk(KERN_INFO "btrfs: disabling disk space caching\n"); 58073bc1876SJosef Bacik btrfs_clear_opt(info->mount_opt, SPACE_CACHE); 58173bc1876SJosef Bacik break; 5824b9465cbSChris Mason case Opt_inode_cache: 5834b9465cbSChris Mason printk(KERN_INFO "btrfs: enabling inode map caching\n"); 5844b9465cbSChris Mason btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); 5854b9465cbSChris Mason break; 58688c2ba3bSJosef Bacik case Opt_clear_cache: 58788c2ba3bSJosef Bacik printk(KERN_INFO "btrfs: force clearing of disk cache\n"); 58888c2ba3bSJosef Bacik btrfs_set_opt(info->mount_opt, CLEAR_CACHE); 5890af3d00bSJosef Bacik break; 5904260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 5914260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 5924260f7c7SSage Weil break; 59391435650SChris Mason case Opt_enospc_debug: 59491435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 59591435650SChris Mason break; 5964cb5300bSChris Mason case Opt_defrag: 59748940662SDaniel J Blueman printk(KERN_INFO "btrfs: enabling auto defrag\n"); 5984cb5300bSChris Mason btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); 5994cb5300bSChris Mason break; 600af31f5e5SChris Mason case Opt_recovery: 60148940662SDaniel J Blueman printk(KERN_INFO "btrfs: enabling auto recovery\n"); 602af31f5e5SChris Mason btrfs_set_opt(info->mount_opt, RECOVERY); 603af31f5e5SChris Mason break; 6049555c6c1SIlya Dryomov case Opt_skip_balance: 6059555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 6069555c6c1SIlya Dryomov break; 60721adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 60821adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 60921adbd5cSStefan Behrens printk(KERN_INFO "btrfs: enabling check integrity" 61021adbd5cSStefan Behrens " including extent data\n"); 61121adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 61221adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 61321adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 61421adbd5cSStefan Behrens break; 61521adbd5cSStefan Behrens case Opt_check_integrity: 61621adbd5cSStefan Behrens printk(KERN_INFO "btrfs: enabling check integrity\n"); 61721adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 61821adbd5cSStefan Behrens break; 61921adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 6202c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6212c334e87SWang Shilong if (ret) { 6222c334e87SWang Shilong goto out; 6232c334e87SWang Shilong } else if (intarg >= 0) { 62421adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 62521adbd5cSStefan Behrens printk(KERN_INFO "btrfs:" 62621adbd5cSStefan Behrens " check_integrity_print_mask 0x%x\n", 62721adbd5cSStefan Behrens info->check_integrity_print_mask); 6282c334e87SWang Shilong } else { 6292c334e87SWang Shilong ret = -EINVAL; 6302c334e87SWang Shilong goto out; 63121adbd5cSStefan Behrens } 63221adbd5cSStefan Behrens break; 63321adbd5cSStefan Behrens #else 63421adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 63521adbd5cSStefan Behrens case Opt_check_integrity: 63621adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 63721adbd5cSStefan Behrens printk(KERN_ERR "btrfs: support for check_integrity*" 63821adbd5cSStefan Behrens " not compiled in!\n"); 63921adbd5cSStefan Behrens ret = -EINVAL; 64021adbd5cSStefan Behrens goto out; 64121adbd5cSStefan Behrens #endif 6428c342930SJeff Mahoney case Opt_fatal_errors: 6438c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 6448c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 6458c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 6468c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 6478c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 6488c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 6498c342930SJeff Mahoney else { 6508c342930SJeff Mahoney ret = -EINVAL; 6518c342930SJeff Mahoney goto out; 6528c342930SJeff Mahoney } 6538c342930SJeff Mahoney break; 6548b87dc17SDavid Sterba case Opt_commit_interval: 6558b87dc17SDavid Sterba intarg = 0; 6568b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 6578b87dc17SDavid Sterba if (ret < 0) { 6588b87dc17SDavid Sterba printk(KERN_ERR 6598b87dc17SDavid Sterba "btrfs: invalid commit interval\n"); 6608b87dc17SDavid Sterba ret = -EINVAL; 6618b87dc17SDavid Sterba goto out; 6628b87dc17SDavid Sterba } 6638b87dc17SDavid Sterba if (intarg > 0) { 6648b87dc17SDavid Sterba if (intarg > 300) { 6658b87dc17SDavid Sterba printk(KERN_WARNING 6668b87dc17SDavid Sterba "btrfs: excessive commit interval %d\n", 6678b87dc17SDavid Sterba intarg); 6688b87dc17SDavid Sterba } 6698b87dc17SDavid Sterba info->commit_interval = intarg; 6708b87dc17SDavid Sterba } else { 6718b87dc17SDavid Sterba printk(KERN_INFO 6728b87dc17SDavid Sterba "btrfs: using default commit interval %ds\n", 6738b87dc17SDavid Sterba BTRFS_DEFAULT_COMMIT_INTERVAL); 6748b87dc17SDavid Sterba info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 6758b87dc17SDavid Sterba } 6768b87dc17SDavid Sterba break; 677a7a3f7caSSage Weil case Opt_err: 678a7a3f7caSSage Weil printk(KERN_INFO "btrfs: unrecognized mount option " 679a7a3f7caSSage Weil "'%s'\n", p); 680a7a3f7caSSage Weil ret = -EINVAL; 681a7a3f7caSSage Weil goto out; 68295e05289SChris Mason default: 683be20aa9dSChris Mason break; 68495e05289SChris Mason } 68595e05289SChris Mason } 686a7a3f7caSSage Weil out: 68773bc1876SJosef Bacik if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 68873bc1876SJosef Bacik printk(KERN_INFO "btrfs: disk space caching is enabled\n"); 689da495eccSJosef Bacik kfree(orig); 690a7a3f7caSSage Weil return ret; 691edf24abeSChristoph Hellwig } 692edf24abeSChristoph Hellwig 693edf24abeSChristoph Hellwig /* 694edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 695edf24abeSChristoph Hellwig * 696edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 697edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 698edf24abeSChristoph Hellwig */ 69997288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 70073f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 7015e2a4b25SDavid Sterba struct btrfs_fs_devices **fs_devices) 702edf24abeSChristoph Hellwig { 703edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 70483c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 7051493381fSWang Shilong char *num = NULL; 706edf24abeSChristoph Hellwig int error = 0; 707edf24abeSChristoph Hellwig 708edf24abeSChristoph Hellwig if (!options) 709830c4adbSJosef Bacik return 0; 710edf24abeSChristoph Hellwig 711edf24abeSChristoph Hellwig /* 712edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 713edf24abeSChristoph Hellwig * gets called twice 714edf24abeSChristoph Hellwig */ 715edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 716edf24abeSChristoph Hellwig if (!opts) 717edf24abeSChristoph Hellwig return -ENOMEM; 7183f3d0bc0STero Roponen orig = opts; 719edf24abeSChristoph Hellwig 720edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 721edf24abeSChristoph Hellwig int token; 722edf24abeSChristoph Hellwig if (!*p) 723edf24abeSChristoph Hellwig continue; 724edf24abeSChristoph Hellwig 725edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 726edf24abeSChristoph Hellwig switch (token) { 727edf24abeSChristoph Hellwig case Opt_subvol: 728a90e8b6fSIlya Dryomov kfree(*subvol_name); 729edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 7302c334e87SWang Shilong if (!*subvol_name) { 7312c334e87SWang Shilong error = -ENOMEM; 7322c334e87SWang Shilong goto out; 7332c334e87SWang Shilong } 734edf24abeSChristoph Hellwig break; 73573f73415SJosef Bacik case Opt_subvolid: 7361493381fSWang Shilong num = match_strdup(&args[0]); 7371493381fSWang Shilong if (num) { 7381493381fSWang Shilong *subvol_objectid = memparse(num, NULL); 7391493381fSWang Shilong kfree(num); 7404849f01dSJosef Bacik /* we want the original fs_tree */ 7411493381fSWang Shilong if (!*subvol_objectid) 7424849f01dSJosef Bacik *subvol_objectid = 7434849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 7442c334e87SWang Shilong } else { 7452c334e87SWang Shilong error = -EINVAL; 7462c334e87SWang Shilong goto out; 7474849f01dSJosef Bacik } 74873f73415SJosef Bacik break; 749e15d0542SXin Zhong case Opt_subvolrootid: 7505e2a4b25SDavid Sterba printk(KERN_WARNING 7515e2a4b25SDavid Sterba "btrfs: 'subvolrootid' mount option is deprecated and has no effect\n"); 752e15d0542SXin Zhong break; 75343e570b0SChristoph Hellwig case Opt_device: 75483c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 75583c8c9bdSJeff Liu if (!device_name) { 75683c8c9bdSJeff Liu error = -ENOMEM; 75783c8c9bdSJeff Liu goto out; 75883c8c9bdSJeff Liu } 75983c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 76043e570b0SChristoph Hellwig flags, holder, fs_devices); 76183c8c9bdSJeff Liu kfree(device_name); 76243e570b0SChristoph Hellwig if (error) 763830c4adbSJosef Bacik goto out; 76443e570b0SChristoph Hellwig break; 765edf24abeSChristoph Hellwig default: 766edf24abeSChristoph Hellwig break; 767edf24abeSChristoph Hellwig } 768edf24abeSChristoph Hellwig } 769edf24abeSChristoph Hellwig 770edf24abeSChristoph Hellwig out: 771830c4adbSJosef Bacik kfree(orig); 772edf24abeSChristoph Hellwig return error; 77395e05289SChris Mason } 77495e05289SChris Mason 77573f73415SJosef Bacik static struct dentry *get_default_root(struct super_block *sb, 77673f73415SJosef Bacik u64 subvol_objectid) 77773f73415SJosef Bacik { 778815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 779815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 78073f73415SJosef Bacik struct btrfs_root *new_root; 78173f73415SJosef Bacik struct btrfs_dir_item *di; 78273f73415SJosef Bacik struct btrfs_path *path; 78373f73415SJosef Bacik struct btrfs_key location; 78473f73415SJosef Bacik struct inode *inode; 78573f73415SJosef Bacik u64 dir_id; 78673f73415SJosef Bacik int new = 0; 78773f73415SJosef Bacik 78873f73415SJosef Bacik /* 78973f73415SJosef Bacik * We have a specific subvol we want to mount, just setup location and 79073f73415SJosef Bacik * go look up the root. 79173f73415SJosef Bacik */ 79273f73415SJosef Bacik if (subvol_objectid) { 79373f73415SJosef Bacik location.objectid = subvol_objectid; 79473f73415SJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 79573f73415SJosef Bacik location.offset = (u64)-1; 79673f73415SJosef Bacik goto find_root; 79773f73415SJosef Bacik } 79873f73415SJosef Bacik 79973f73415SJosef Bacik path = btrfs_alloc_path(); 80073f73415SJosef Bacik if (!path) 80173f73415SJosef Bacik return ERR_PTR(-ENOMEM); 80273f73415SJosef Bacik path->leave_spinning = 1; 80373f73415SJosef Bacik 80473f73415SJosef Bacik /* 80573f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 80673f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 80773f73415SJosef Bacik * to mount. 80873f73415SJosef Bacik */ 809815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 81073f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 811b0839166SJulia Lawall if (IS_ERR(di)) { 812b0839166SJulia Lawall btrfs_free_path(path); 813fb4f6f91SDan Carpenter return ERR_CAST(di); 814b0839166SJulia Lawall } 81573f73415SJosef Bacik if (!di) { 81673f73415SJosef Bacik /* 81773f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 81873f73415SJosef Bacik * it's always been there, but don't freak out, just try and 81973f73415SJosef Bacik * mount to root most subvolume. 82073f73415SJosef Bacik */ 82173f73415SJosef Bacik btrfs_free_path(path); 82273f73415SJosef Bacik dir_id = BTRFS_FIRST_FREE_OBJECTID; 823815745cfSAl Viro new_root = fs_info->fs_root; 82473f73415SJosef Bacik goto setup_root; 82573f73415SJosef Bacik } 82673f73415SJosef Bacik 82773f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 82873f73415SJosef Bacik btrfs_free_path(path); 82973f73415SJosef Bacik 83073f73415SJosef Bacik find_root: 831815745cfSAl Viro new_root = btrfs_read_fs_root_no_name(fs_info, &location); 83273f73415SJosef Bacik if (IS_ERR(new_root)) 833d0b678cbSJulia Lawall return ERR_CAST(new_root); 83473f73415SJosef Bacik 83573f73415SJosef Bacik dir_id = btrfs_root_dirid(&new_root->root_item); 83673f73415SJosef Bacik setup_root: 83773f73415SJosef Bacik location.objectid = dir_id; 83873f73415SJosef Bacik location.type = BTRFS_INODE_ITEM_KEY; 83973f73415SJosef Bacik location.offset = 0; 84073f73415SJosef Bacik 84173f73415SJosef Bacik inode = btrfs_iget(sb, &location, new_root, &new); 8424cbd1149SDan Carpenter if (IS_ERR(inode)) 8434cbd1149SDan Carpenter return ERR_CAST(inode); 84473f73415SJosef Bacik 84573f73415SJosef Bacik /* 84673f73415SJosef Bacik * If we're just mounting the root most subvol put the inode and return 84773f73415SJosef Bacik * a reference to the dentry. We will have already gotten a reference 84873f73415SJosef Bacik * to the inode in btrfs_fill_super so we're good to go. 84973f73415SJosef Bacik */ 85073f73415SJosef Bacik if (!new && sb->s_root->d_inode == inode) { 85173f73415SJosef Bacik iput(inode); 85273f73415SJosef Bacik return dget(sb->s_root); 85373f73415SJosef Bacik } 85473f73415SJosef Bacik 855ba5b8958SJosef Bacik return d_obtain_alias(inode); 85673f73415SJosef Bacik } 85773f73415SJosef Bacik 8588a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 8598a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 8608a4b83ccSChris Mason void *data, int silent) 8612e635a27SChris Mason { 8622e635a27SChris Mason struct inode *inode; 863815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 8645d4f98a2SYan Zheng struct btrfs_key key; 86539279cc3SChris Mason int err; 8662e635a27SChris Mason 8672e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 8682e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 869e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 870af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 871be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 8725103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 8732e635a27SChris Mason sb->s_time_gran = 1; 8740eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 87533268eafSJosef Bacik sb->s_flags |= MS_POSIXACL; 87649cf6f45SChris Ball #endif 8770c4d2d95SJosef Bacik sb->s_flags |= MS_I_VERSION; 878ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 879ad2b2c80SAl Viro if (err) { 880e20d96d6SChris Mason printk("btrfs: open_ctree failed\n"); 881ad2b2c80SAl Viro return err; 882e20d96d6SChris Mason } 883b888db2bSChris Mason 8845d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 8855d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 8865d4f98a2SYan Zheng key.offset = 0; 88798c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 8885d4f98a2SYan Zheng if (IS_ERR(inode)) { 8895d4f98a2SYan Zheng err = PTR_ERR(inode); 89039279cc3SChris Mason goto fail_close; 89139279cc3SChris Mason } 8922e635a27SChris Mason 89348fde701SAl Viro sb->s_root = d_make_root(inode); 89448fde701SAl Viro if (!sb->s_root) { 89539279cc3SChris Mason err = -ENOMEM; 89639279cc3SChris Mason goto fail_close; 8972e635a27SChris Mason } 89858176a96SJosef Bacik 8996885f308SChris Mason save_mount_options(sb, data); 90090a887c9SDan Magenheimer cleancache_init_fs(sb); 90159553edfSAl Viro sb->s_flags |= MS_ACTIVE; 9022e635a27SChris Mason return 0; 9032e635a27SChris Mason 90439279cc3SChris Mason fail_close: 905815745cfSAl Viro close_ctree(fs_info->tree_root); 906d5719762SChris Mason return err; 907d5719762SChris Mason } 908d5719762SChris Mason 9096bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 910d5719762SChris Mason { 911d5719762SChris Mason struct btrfs_trans_handle *trans; 912815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 913815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 914df2ce34cSChris Mason 9151abe9b8aSliubo trace_btrfs_sync_fs(wait); 9161abe9b8aSliubo 917d561c025SChris Mason if (!wait) { 918815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 919df2ce34cSChris Mason return 0; 920d561c025SChris Mason } 921771ed689SChris Mason 922b0244199SMiao Xie btrfs_wait_ordered_roots(fs_info, -1); 923771ed689SChris Mason 924d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 92560376ce4SJosef Bacik if (IS_ERR(trans)) { 926354aa0fbSMiao Xie /* no transaction, don't bother */ 927354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 928bd7de2c9SJosef Bacik return 0; 92998d5dc13STsutomu Itoh return PTR_ERR(trans); 93060376ce4SJosef Bacik } 931bd7de2c9SJosef Bacik return btrfs_commit_transaction(trans, root); 932d5719762SChris Mason } 933d5719762SChris Mason 93434c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 935a9572a15SEric Paris { 936815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 937815745cfSAl Viro struct btrfs_root *root = info->tree_root; 938200da64eSTsutomu Itoh char *compress_type; 939a9572a15SEric Paris 940a9572a15SEric Paris if (btrfs_test_opt(root, DEGRADED)) 941a9572a15SEric Paris seq_puts(seq, ",degraded"); 942a9572a15SEric Paris if (btrfs_test_opt(root, NODATASUM)) 943a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 944a9572a15SEric Paris if (btrfs_test_opt(root, NODATACOW)) 945a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 946a9572a15SEric Paris if (btrfs_test_opt(root, NOBARRIER)) 947a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 948a9572a15SEric Paris if (info->max_inline != 8192 * 1024) 949c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 950a9572a15SEric Paris if (info->alloc_start != 0) 951c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",alloc_start=%llu", info->alloc_start); 952a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 953a9572a15SEric Paris num_online_cpus() + 2, 8)) 954a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 955200da64eSTsutomu Itoh if (btrfs_test_opt(root, COMPRESS)) { 956200da64eSTsutomu Itoh if (info->compress_type == BTRFS_COMPRESS_ZLIB) 957200da64eSTsutomu Itoh compress_type = "zlib"; 958200da64eSTsutomu Itoh else 959200da64eSTsutomu Itoh compress_type = "lzo"; 960200da64eSTsutomu Itoh if (btrfs_test_opt(root, FORCE_COMPRESS)) 961200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 962200da64eSTsutomu Itoh else 963200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 964200da64eSTsutomu Itoh } 965c289811cSChris Mason if (btrfs_test_opt(root, NOSSD)) 966c289811cSChris Mason seq_puts(seq, ",nossd"); 967451d7585SChris Mason if (btrfs_test_opt(root, SSD_SPREAD)) 968451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 969451d7585SChris Mason else if (btrfs_test_opt(root, SSD)) 970a9572a15SEric Paris seq_puts(seq, ",ssd"); 9713a5e1404SSage Weil if (btrfs_test_opt(root, NOTREELOG)) 9726b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 973dccae999SSage Weil if (btrfs_test_opt(root, FLUSHONCOMMIT)) 9746b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 97520a5239aSMatthew Wilcox if (btrfs_test_opt(root, DISCARD)) 97620a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 977a9572a15SEric Paris if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 978a9572a15SEric Paris seq_puts(seq, ",noacl"); 979200da64eSTsutomu Itoh if (btrfs_test_opt(root, SPACE_CACHE)) 980200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 98173bc1876SJosef Bacik else 9828965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 983f420ee1eSStefan Behrens if (btrfs_test_opt(root, RESCAN_UUID_TREE)) 984f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 985200da64eSTsutomu Itoh if (btrfs_test_opt(root, CLEAR_CACHE)) 986200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 987200da64eSTsutomu Itoh if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 988200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 9890942caa3SDavid Sterba if (btrfs_test_opt(root, ENOSPC_DEBUG)) 9900942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 9910942caa3SDavid Sterba if (btrfs_test_opt(root, AUTO_DEFRAG)) 9920942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 9930942caa3SDavid Sterba if (btrfs_test_opt(root, INODE_MAP_CACHE)) 9940942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 9959555c6c1SIlya Dryomov if (btrfs_test_opt(root, SKIP_BALANCE)) 9969555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 9978507d216SWang Shilong if (btrfs_test_opt(root, RECOVERY)) 9988507d216SWang Shilong seq_puts(seq, ",recovery"); 9998507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 10008507d216SWang Shilong if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 10018507d216SWang Shilong seq_puts(seq, ",check_int_data"); 10028507d216SWang Shilong else if (btrfs_test_opt(root, CHECK_INTEGRITY)) 10038507d216SWang Shilong seq_puts(seq, ",check_int"); 10048507d216SWang Shilong if (info->check_integrity_print_mask) 10058507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 10068507d216SWang Shilong info->check_integrity_print_mask); 10078507d216SWang Shilong #endif 10088507d216SWang Shilong if (info->metadata_ratio) 10098507d216SWang Shilong seq_printf(seq, ",metadata_ratio=%d", 10108507d216SWang Shilong info->metadata_ratio); 10118c342930SJeff Mahoney if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 10128c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 10138b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 10148b87dc17SDavid Sterba seq_printf(seq, ",commit=%d", info->commit_interval); 1015a9572a15SEric Paris return 0; 1016a9572a15SEric Paris } 1017a9572a15SEric Paris 1018a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 10192e635a27SChris Mason { 1020815745cfSAl Viro struct btrfs_fs_info *p = data; 1021815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 10224b82d6e4SYan 1023815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 10244b82d6e4SYan } 10254b82d6e4SYan 1026450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1027450ba0eaSJosef Bacik { 10286de1d09dSAl Viro int err = set_anon_super(s, data); 10296de1d09dSAl Viro if (!err) 1030450ba0eaSJosef Bacik s->s_fs_info = data; 10316de1d09dSAl Viro return err; 1032450ba0eaSJosef Bacik } 1033450ba0eaSJosef Bacik 1034830c4adbSJosef Bacik /* 1035f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1036f9d9ef62SDavid Sterba */ 1037f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1038f9d9ef62SDavid Sterba { 1039f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1040f9d9ef62SDavid Sterba return 1; 1041f9d9ef62SDavid Sterba return 0; 1042f9d9ef62SDavid Sterba } 1043f9d9ef62SDavid Sterba 1044f9d9ef62SDavid Sterba /* 1045830c4adbSJosef Bacik * This will strip out the subvol=%s argument for an argument string and add 1046830c4adbSJosef Bacik * subvolid=0 to make sure we get the actual tree root for path walking to the 1047830c4adbSJosef Bacik * subvol we want. 1048830c4adbSJosef Bacik */ 1049830c4adbSJosef Bacik static char *setup_root_args(char *args) 1050830c4adbSJosef Bacik { 1051f60d16a8SJim Meyering unsigned len = strlen(args) + 2 + 1; 1052f60d16a8SJim Meyering char *src, *dst, *buf; 1053830c4adbSJosef Bacik 1054830c4adbSJosef Bacik /* 1055f60d16a8SJim Meyering * We need the same args as before, but with this substitution: 1056f60d16a8SJim Meyering * s!subvol=[^,]+!subvolid=0! 1057830c4adbSJosef Bacik * 1058f60d16a8SJim Meyering * Since the replacement string is up to 2 bytes longer than the 1059f60d16a8SJim Meyering * original, allocate strlen(args) + 2 + 1 bytes. 1060830c4adbSJosef Bacik */ 1061830c4adbSJosef Bacik 1062f60d16a8SJim Meyering src = strstr(args, "subvol="); 1063830c4adbSJosef Bacik /* This shouldn't happen, but just in case.. */ 1064f60d16a8SJim Meyering if (!src) 1065830c4adbSJosef Bacik return NULL; 1066f60d16a8SJim Meyering 1067f60d16a8SJim Meyering buf = dst = kmalloc(len, GFP_NOFS); 1068f60d16a8SJim Meyering if (!buf) 1069f60d16a8SJim Meyering return NULL; 1070830c4adbSJosef Bacik 1071830c4adbSJosef Bacik /* 1072f60d16a8SJim Meyering * If the subvol= arg is not at the start of the string, 1073f60d16a8SJim Meyering * copy whatever precedes it into buf. 1074830c4adbSJosef Bacik */ 1075f60d16a8SJim Meyering if (src != args) { 1076f60d16a8SJim Meyering *src++ = '\0'; 1077f60d16a8SJim Meyering strcpy(buf, args); 1078f60d16a8SJim Meyering dst += strlen(args); 1079830c4adbSJosef Bacik } 1080830c4adbSJosef Bacik 1081f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 1082f60d16a8SJim Meyering dst += strlen("subvolid=0"); 1083830c4adbSJosef Bacik 1084830c4adbSJosef Bacik /* 1085f60d16a8SJim Meyering * If there is a "," after the original subvol=... string, 1086f60d16a8SJim Meyering * copy that suffix into our buffer. Otherwise, we're done. 1087830c4adbSJosef Bacik */ 1088f60d16a8SJim Meyering src = strchr(src, ','); 1089f60d16a8SJim Meyering if (src) 1090f60d16a8SJim Meyering strcpy(dst, src); 1091830c4adbSJosef Bacik 1092f60d16a8SJim Meyering return buf; 1093830c4adbSJosef Bacik } 1094830c4adbSJosef Bacik 1095830c4adbSJosef Bacik static struct dentry *mount_subvol(const char *subvol_name, int flags, 1096830c4adbSJosef Bacik const char *device_name, char *data) 1097830c4adbSJosef Bacik { 1098830c4adbSJosef Bacik struct dentry *root; 1099830c4adbSJosef Bacik struct vfsmount *mnt; 1100830c4adbSJosef Bacik char *newargs; 1101830c4adbSJosef Bacik 1102830c4adbSJosef Bacik newargs = setup_root_args(data); 1103830c4adbSJosef Bacik if (!newargs) 1104830c4adbSJosef Bacik return ERR_PTR(-ENOMEM); 1105830c4adbSJosef Bacik mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, 1106830c4adbSJosef Bacik newargs); 1107830c4adbSJosef Bacik kfree(newargs); 1108830c4adbSJosef Bacik if (IS_ERR(mnt)) 1109830c4adbSJosef Bacik return ERR_CAST(mnt); 1110830c4adbSJosef Bacik 1111ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1112830c4adbSJosef Bacik 1113ea441d11SAl Viro if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { 1114ea441d11SAl Viro struct super_block *s = root->d_sb; 1115ea441d11SAl Viro dput(root); 1116ea441d11SAl Viro root = ERR_PTR(-EINVAL); 1117ea441d11SAl Viro deactivate_locked_super(s); 1118f9d9ef62SDavid Sterba printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", 1119f9d9ef62SDavid Sterba subvol_name); 1120f9d9ef62SDavid Sterba } 1121f9d9ef62SDavid Sterba 1122830c4adbSJosef Bacik return root; 1123830c4adbSJosef Bacik } 1124450ba0eaSJosef Bacik 1125edf24abeSChristoph Hellwig /* 1126edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1127edf24abeSChristoph Hellwig * 1128edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1129edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1130edf24abeSChristoph Hellwig */ 1131061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1132306e16ceSDavid Sterba const char *device_name, void *data) 11334b82d6e4SYan { 11344b82d6e4SYan struct block_device *bdev = NULL; 11354b82d6e4SYan struct super_block *s; 11364b82d6e4SYan struct dentry *root; 11378a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1138450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 113997288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 114073f73415SJosef Bacik char *subvol_name = NULL; 114173f73415SJosef Bacik u64 subvol_objectid = 0; 11424b82d6e4SYan int error = 0; 11434b82d6e4SYan 114497288f2cSChristoph Hellwig if (!(flags & MS_RDONLY)) 114597288f2cSChristoph Hellwig mode |= FMODE_WRITE; 114697288f2cSChristoph Hellwig 114797288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 114873f73415SJosef Bacik &subvol_name, &subvol_objectid, 11495e2a4b25SDavid Sterba &fs_devices); 1150f23c8af8SIlya Dryomov if (error) { 1151f23c8af8SIlya Dryomov kfree(subvol_name); 1152061dbc6bSAl Viro return ERR_PTR(error); 1153f23c8af8SIlya Dryomov } 1154edf24abeSChristoph Hellwig 1155830c4adbSJosef Bacik if (subvol_name) { 1156830c4adbSJosef Bacik root = mount_subvol(subvol_name, flags, device_name, data); 1157830c4adbSJosef Bacik kfree(subvol_name); 1158830c4adbSJosef Bacik return root; 1159830c4adbSJosef Bacik } 1160830c4adbSJosef Bacik 1161306e16ceSDavid Sterba error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 11628a4b83ccSChris Mason if (error) 1163830c4adbSJosef Bacik return ERR_PTR(error); 11644b82d6e4SYan 1165450ba0eaSJosef Bacik /* 1166450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1167450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1168450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1169450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1170450ba0eaSJosef Bacik */ 1171450ba0eaSJosef Bacik fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 117204d21a24SIlya Dryomov if (!fs_info) 117304d21a24SIlya Dryomov return ERR_PTR(-ENOMEM); 117404d21a24SIlya Dryomov 1175450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1176450ba0eaSJosef Bacik 11776c41761fSDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 11786c41761fSDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 11796c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 11806c41761fSDavid Sterba error = -ENOMEM; 118104d21a24SIlya Dryomov goto error_fs_info; 118204d21a24SIlya Dryomov } 118304d21a24SIlya Dryomov 118404d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 118504d21a24SIlya Dryomov if (error) 118604d21a24SIlya Dryomov goto error_fs_info; 118704d21a24SIlya Dryomov 118804d21a24SIlya Dryomov if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 118904d21a24SIlya Dryomov error = -EACCES; 11906c41761fSDavid Sterba goto error_close_devices; 11916c41761fSDavid Sterba } 11926c41761fSDavid Sterba 1193dfe25020SChris Mason bdev = fs_devices->latest_bdev; 11949249e17fSDavid Howells s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 11959249e17fSDavid Howells fs_info); 1196830c4adbSJosef Bacik if (IS_ERR(s)) { 1197830c4adbSJosef Bacik error = PTR_ERR(s); 1198830c4adbSJosef Bacik goto error_close_devices; 1199830c4adbSJosef Bacik } 12004b82d6e4SYan 12014b82d6e4SYan if (s->s_root) { 12022b82032cSYan Zheng btrfs_close_devices(fs_devices); 12036c41761fSDavid Sterba free_fs_info(fs_info); 120459553edfSAl Viro if ((flags ^ s->s_flags) & MS_RDONLY) 120559553edfSAl Viro error = -EBUSY; 12064b82d6e4SYan } else { 12074b82d6e4SYan char b[BDEVNAME_SIZE]; 12084b82d6e4SYan 12094b82d6e4SYan strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1210815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 12118a4b83ccSChris Mason error = btrfs_fill_super(s, fs_devices, data, 12128a4b83ccSChris Mason flags & MS_SILENT ? 1 : 0); 12134b82d6e4SYan } 12144b82d6e4SYan 121559553edfSAl Viro root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); 121659553edfSAl Viro if (IS_ERR(root)) 1217e15d0542SXin Zhong deactivate_locked_super(s); 12184b82d6e4SYan 1219061dbc6bSAl Viro return root; 12204b82d6e4SYan 1221c146afadSYan Zheng error_close_devices: 12228a4b83ccSChris Mason btrfs_close_devices(fs_devices); 122304d21a24SIlya Dryomov error_fs_info: 12246c41761fSDavid Sterba free_fs_info(fs_info); 1225061dbc6bSAl Viro return ERR_PTR(error); 12264b82d6e4SYan } 12272e635a27SChris Mason 12280d2450abSSergei Trofimovich static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) 12290d2450abSSergei Trofimovich { 12300d2450abSSergei Trofimovich spin_lock_irq(&workers->lock); 12310d2450abSSergei Trofimovich workers->max_workers = new_limit; 12320d2450abSSergei Trofimovich spin_unlock_irq(&workers->lock); 12330d2450abSSergei Trofimovich } 12340d2450abSSergei Trofimovich 12350d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 12360d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 12370d2450abSSergei Trofimovich { 12380d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 12390d2450abSSergei Trofimovich return; 12400d2450abSSergei Trofimovich 12410d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 12420d2450abSSergei Trofimovich 12430d2450abSSergei Trofimovich printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", 12440d2450abSSergei Trofimovich old_pool_size, new_pool_size); 12450d2450abSSergei Trofimovich 12460d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); 12470d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->workers, new_pool_size); 12480d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); 12490d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); 12500d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); 12510d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); 12520d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); 12530d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); 12540d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); 12550d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); 12560d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); 12570d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); 12580d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); 1259ff023aacSStefan Behrens btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers, 1260ff023aacSStefan Behrens new_pool_size); 12610d2450abSSergei Trofimovich } 12620d2450abSSergei Trofimovich 1263f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1264dc81cdc5SMiao Xie { 1265dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1266f42a34b2SMiao Xie } 1267dc81cdc5SMiao Xie 1268f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1269f42a34b2SMiao Xie unsigned long old_opts, int flags) 1270f42a34b2SMiao Xie { 1271dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1272dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1273dc81cdc5SMiao Xie (flags & MS_RDONLY))) { 1274dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1275dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1276dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 1277dc81cdc5SMiao Xie if (flags & MS_RDONLY) 1278dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1279dc81cdc5SMiao Xie } 1280dc81cdc5SMiao Xie } 1281dc81cdc5SMiao Xie 1282dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1283dc81cdc5SMiao Xie unsigned long old_opts) 1284dc81cdc5SMiao Xie { 1285dc81cdc5SMiao Xie /* 1286dc81cdc5SMiao Xie * We need cleanup all defragable inodes if the autodefragment is 1287dc81cdc5SMiao Xie * close or the fs is R/O. 1288dc81cdc5SMiao Xie */ 1289dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1290dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1291dc81cdc5SMiao Xie (fs_info->sb->s_flags & MS_RDONLY))) { 1292dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1293dc81cdc5SMiao Xie } 1294dc81cdc5SMiao Xie 1295dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1296dc81cdc5SMiao Xie } 1297dc81cdc5SMiao Xie 1298c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1299c146afadSYan Zheng { 1300815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1301815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 130249b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 130349b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 130449b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 130549b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 130649b25e05SJeff Mahoney u64 old_alloc_start = fs_info->alloc_start; 130749b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 130849b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1309c146afadSYan Zheng int ret; 1310c146afadSYan Zheng 1311f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1312dc81cdc5SMiao Xie 1313b288052eSChris Mason ret = btrfs_parse_options(root, data); 131449b25e05SJeff Mahoney if (ret) { 131549b25e05SJeff Mahoney ret = -EINVAL; 131649b25e05SJeff Mahoney goto restore; 131749b25e05SJeff Mahoney } 1318b288052eSChris Mason 1319f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 13200d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 13210d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 13220d2450abSSergei Trofimovich 1323c146afadSYan Zheng if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1324dc81cdc5SMiao Xie goto out; 1325c146afadSYan Zheng 1326c146afadSYan Zheng if (*flags & MS_RDONLY) { 13278dabb742SStefan Behrens /* 13288dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 13298dabb742SStefan Behrens * the filesystem is busy. 13308dabb742SStefan Behrens */ 1331361c093dSStefan Behrens 1332361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1333361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1334361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1335361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1336361c093dSStefan Behrens 1337c146afadSYan Zheng sb->s_flags |= MS_RDONLY; 1338c146afadSYan Zheng 13398dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 13408dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1341061594efSMiao Xie btrfs_pause_balance(fs_info); 13428dabb742SStefan Behrens 1343c146afadSYan Zheng ret = btrfs_commit_super(root); 134449b25e05SJeff Mahoney if (ret) 134549b25e05SJeff Mahoney goto restore; 1346c146afadSYan Zheng } else { 13476ef3de9cSDavid Sterba if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { 13486ef3de9cSDavid Sterba btrfs_err(fs_info, 13496ef3de9cSDavid Sterba "Remounting read-write after error is not allowed\n"); 13506ef3de9cSDavid Sterba ret = -EINVAL; 13516ef3de9cSDavid Sterba goto restore; 13526ef3de9cSDavid Sterba } 13538a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 135449b25e05SJeff Mahoney ret = -EACCES; 135549b25e05SJeff Mahoney goto restore; 13568a3db184SSergei Trofimovich } 13572b82032cSYan Zheng 1358292fd7fcSStefan Behrens if (fs_info->fs_devices->missing_devices > 1359292fd7fcSStefan Behrens fs_info->num_tolerated_disk_barrier_failures && 1360292fd7fcSStefan Behrens !(*flags & MS_RDONLY)) { 1361292fd7fcSStefan Behrens printk(KERN_WARNING 1362292fd7fcSStefan Behrens "Btrfs: too many missing devices, writeable remount is not allowed\n"); 1363292fd7fcSStefan Behrens ret = -EACCES; 1364292fd7fcSStefan Behrens goto restore; 1365292fd7fcSStefan Behrens } 1366292fd7fcSStefan Behrens 13678a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 136849b25e05SJeff Mahoney ret = -EINVAL; 136949b25e05SJeff Mahoney goto restore; 13708a3db184SSergei Trofimovich } 1371c146afadSYan Zheng 1372815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 137349b25e05SJeff Mahoney if (ret) 137449b25e05SJeff Mahoney goto restore; 1375c146afadSYan Zheng 1376d68fc57bSYan, Zheng /* recover relocation */ 1377d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 137849b25e05SJeff Mahoney if (ret) 137949b25e05SJeff Mahoney goto restore; 1380c146afadSYan Zheng 13812b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 13822b6ba629SIlya Dryomov if (ret) 13832b6ba629SIlya Dryomov goto restore; 13842b6ba629SIlya Dryomov 13858dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 13868dabb742SStefan Behrens if (ret) { 13878dabb742SStefan Behrens pr_warn("btrfs: failed to resume dev_replace\n"); 13888dabb742SStefan Behrens goto restore; 13898dabb742SStefan Behrens } 139094aebfb2SJosef Bacik 139194aebfb2SJosef Bacik if (!fs_info->uuid_root) { 139294aebfb2SJosef Bacik pr_info("btrfs: creating UUID tree\n"); 139394aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 139494aebfb2SJosef Bacik if (ret) { 139594aebfb2SJosef Bacik pr_warn("btrfs: failed to create the uuid tree" 139694aebfb2SJosef Bacik "%d\n", ret); 139794aebfb2SJosef Bacik goto restore; 139894aebfb2SJosef Bacik } 139994aebfb2SJosef Bacik } 1400c146afadSYan Zheng sb->s_flags &= ~MS_RDONLY; 1401c146afadSYan Zheng } 1402dc81cdc5SMiao Xie out: 1403dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1404c146afadSYan Zheng return 0; 140549b25e05SJeff Mahoney 140649b25e05SJeff Mahoney restore: 140749b25e05SJeff Mahoney /* We've hit an error - don't reset MS_RDONLY */ 140849b25e05SJeff Mahoney if (sb->s_flags & MS_RDONLY) 140949b25e05SJeff Mahoney old_flags |= MS_RDONLY; 141049b25e05SJeff Mahoney sb->s_flags = old_flags; 141149b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 141249b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 141349b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 1414c018daecSMiao Xie mutex_lock(&fs_info->chunk_mutex); 141549b25e05SJeff Mahoney fs_info->alloc_start = old_alloc_start; 1416c018daecSMiao Xie mutex_unlock(&fs_info->chunk_mutex); 14170d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 14180d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 141949b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1420dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 142149b25e05SJeff Mahoney return ret; 1422c146afadSYan Zheng } 1423c146afadSYan Zheng 1424bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1425bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1426bcd53741SArne Jansen const void *dev_info2) 1427bcd53741SArne Jansen { 1428bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1429bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1430bcd53741SArne Jansen return -1; 1431bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1432bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1433bcd53741SArne Jansen return 1; 1434bcd53741SArne Jansen else 1435bcd53741SArne Jansen return 0; 1436bcd53741SArne Jansen } 1437bcd53741SArne Jansen 1438bcd53741SArne Jansen /* 1439bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1440bcd53741SArne Jansen * is stored.(Descending Sort) 1441bcd53741SArne Jansen */ 1442bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1443bcd53741SArne Jansen struct btrfs_device_info *devices, 1444bcd53741SArne Jansen size_t nr_devices) 1445bcd53741SArne Jansen { 1446bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1447bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1448bcd53741SArne Jansen } 1449bcd53741SArne Jansen 14506d07bcecSMiao Xie /* 14516d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 14526d07bcecSMiao Xie * file data. 14536d07bcecSMiao Xie */ 14546d07bcecSMiao Xie static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 14556d07bcecSMiao Xie { 14566d07bcecSMiao Xie struct btrfs_fs_info *fs_info = root->fs_info; 14576d07bcecSMiao Xie struct btrfs_device_info *devices_info; 14586d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 14596d07bcecSMiao Xie struct btrfs_device *device; 14606d07bcecSMiao Xie u64 skip_space; 14616d07bcecSMiao Xie u64 type; 14626d07bcecSMiao Xie u64 avail_space; 14636d07bcecSMiao Xie u64 used_space; 14646d07bcecSMiao Xie u64 min_stripe_size; 146539fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 14666d07bcecSMiao Xie int i = 0, nr_devices; 14676d07bcecSMiao Xie int ret; 14686d07bcecSMiao Xie 1469b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 14706d07bcecSMiao Xie BUG_ON(!nr_devices); 14716d07bcecSMiao Xie 1472d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 14736d07bcecSMiao Xie GFP_NOFS); 14746d07bcecSMiao Xie if (!devices_info) 14756d07bcecSMiao Xie return -ENOMEM; 14766d07bcecSMiao Xie 14776d07bcecSMiao Xie /* calc min stripe number for data space alloction */ 14786d07bcecSMiao Xie type = btrfs_get_alloc_profile(root, 1); 147939fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 14806d07bcecSMiao Xie min_stripes = 2; 148139fb26c3SMiao Xie num_stripes = nr_devices; 148239fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 14836d07bcecSMiao Xie min_stripes = 2; 148439fb26c3SMiao Xie num_stripes = 2; 148539fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 14866d07bcecSMiao Xie min_stripes = 4; 148739fb26c3SMiao Xie num_stripes = 4; 148839fb26c3SMiao Xie } 14896d07bcecSMiao Xie 14906d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 14916d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 14926d07bcecSMiao Xie else 14936d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 14946d07bcecSMiao Xie 1495b772a86eSLi Zefan list_for_each_entry(device, &fs_devices->devices, dev_list) { 149663a212abSStefan Behrens if (!device->in_fs_metadata || !device->bdev || 149763a212abSStefan Behrens device->is_tgtdev_for_dev_replace) 14986d07bcecSMiao Xie continue; 14996d07bcecSMiao Xie 15006d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 15016d07bcecSMiao Xie 15026d07bcecSMiao Xie /* align with stripe_len */ 15036d07bcecSMiao Xie do_div(avail_space, BTRFS_STRIPE_LEN); 15046d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 15056d07bcecSMiao Xie 15066d07bcecSMiao Xie /* 15076d07bcecSMiao Xie * In order to avoid overwritting the superblock on the drive, 15086d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 15096d07bcecSMiao Xie * allocation. 15106d07bcecSMiao Xie */ 15116d07bcecSMiao Xie skip_space = 1024 * 1024; 15126d07bcecSMiao Xie 15136d07bcecSMiao Xie /* user can set the offset in fs_info->alloc_start. */ 15146d07bcecSMiao Xie if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= 15156d07bcecSMiao Xie device->total_bytes) 15166d07bcecSMiao Xie skip_space = max(fs_info->alloc_start, skip_space); 15176d07bcecSMiao Xie 15186d07bcecSMiao Xie /* 15196d07bcecSMiao Xie * btrfs can not use the free space in [0, skip_space - 1], 15206d07bcecSMiao Xie * we must subtract it from the total. In order to implement 15216d07bcecSMiao Xie * it, we account the used space in this range first. 15226d07bcecSMiao Xie */ 15236d07bcecSMiao Xie ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, 15246d07bcecSMiao Xie &used_space); 15256d07bcecSMiao Xie if (ret) { 15266d07bcecSMiao Xie kfree(devices_info); 15276d07bcecSMiao Xie return ret; 15286d07bcecSMiao Xie } 15296d07bcecSMiao Xie 15306d07bcecSMiao Xie /* calc the free space in [0, skip_space - 1] */ 15316d07bcecSMiao Xie skip_space -= used_space; 15326d07bcecSMiao Xie 15336d07bcecSMiao Xie /* 15346d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 15356d07bcecSMiao Xie * it from the total. 15366d07bcecSMiao Xie */ 15376d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 15386d07bcecSMiao Xie avail_space -= skip_space; 15396d07bcecSMiao Xie else 15406d07bcecSMiao Xie avail_space = 0; 15416d07bcecSMiao Xie 15426d07bcecSMiao Xie if (avail_space < min_stripe_size) 15436d07bcecSMiao Xie continue; 15446d07bcecSMiao Xie 15456d07bcecSMiao Xie devices_info[i].dev = device; 15466d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 15476d07bcecSMiao Xie 15486d07bcecSMiao Xie i++; 15496d07bcecSMiao Xie } 15506d07bcecSMiao Xie 15516d07bcecSMiao Xie nr_devices = i; 15526d07bcecSMiao Xie 15536d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 15546d07bcecSMiao Xie 15556d07bcecSMiao Xie i = nr_devices - 1; 15566d07bcecSMiao Xie avail_space = 0; 15576d07bcecSMiao Xie while (nr_devices >= min_stripes) { 155839fb26c3SMiao Xie if (num_stripes > nr_devices) 155939fb26c3SMiao Xie num_stripes = nr_devices; 156039fb26c3SMiao Xie 15616d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 15626d07bcecSMiao Xie int j; 15636d07bcecSMiao Xie u64 alloc_size; 15646d07bcecSMiao Xie 156539fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 15666d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 156739fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 15686d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 15696d07bcecSMiao Xie } 15706d07bcecSMiao Xie i--; 15716d07bcecSMiao Xie nr_devices--; 15726d07bcecSMiao Xie } 15736d07bcecSMiao Xie 15746d07bcecSMiao Xie kfree(devices_info); 15756d07bcecSMiao Xie *free_bytes = avail_space; 15766d07bcecSMiao Xie return 0; 15776d07bcecSMiao Xie } 15786d07bcecSMiao Xie 15798fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 15808fd17795SChris Mason { 1581815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 1582815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 1583815745cfSAl Viro struct list_head *head = &fs_info->space_info; 1584bd4d1088SJosef Bacik struct btrfs_space_info *found; 1585bd4d1088SJosef Bacik u64 total_used = 0; 15866d07bcecSMiao Xie u64 total_free_data = 0; 1587db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 1588815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 15896d07bcecSMiao Xie int ret; 15908fd17795SChris Mason 15916d07bcecSMiao Xie /* holding chunk_muext to avoid allocating new chunks */ 1592815745cfSAl Viro mutex_lock(&fs_info->chunk_mutex); 1593bd4d1088SJosef Bacik rcu_read_lock(); 159489a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 15956d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 15966d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 15976d07bcecSMiao Xie total_free_data -= 15986d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 15996d07bcecSMiao Xie } 16006d07bcecSMiao Xie 1601b742bb82SYan, Zheng total_used += found->disk_used; 160289a55897SJosef Bacik } 1603bd4d1088SJosef Bacik rcu_read_unlock(); 1604bd4d1088SJosef Bacik 16058fd17795SChris Mason buf->f_namelen = BTRFS_NAME_LEN; 1606db94535dSChris Mason buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; 1607bd4d1088SJosef Bacik buf->f_bfree = buf->f_blocks - (total_used >> bits); 16088fd17795SChris Mason buf->f_bsize = dentry->d_sb->s_blocksize; 16098fd17795SChris Mason buf->f_type = BTRFS_SUPER_MAGIC; 16106d07bcecSMiao Xie buf->f_bavail = total_free_data; 1611815745cfSAl Viro ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 16126d07bcecSMiao Xie if (ret) { 1613815745cfSAl Viro mutex_unlock(&fs_info->chunk_mutex); 16146d07bcecSMiao Xie return ret; 16156d07bcecSMiao Xie } 16166d07bcecSMiao Xie buf->f_bavail += total_free_data; 16176d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 1618815745cfSAl Viro mutex_unlock(&fs_info->chunk_mutex); 1619d397712bSChris Mason 16209d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 16219d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 16229d03632eSDavid Woodhouse on a big-endian or little-endian host */ 16239d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 16249d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 162532d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 162632d48fa1SDavid Woodhouse buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; 162732d48fa1SDavid Woodhouse buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; 162832d48fa1SDavid Woodhouse 16298fd17795SChris Mason return 0; 16308fd17795SChris Mason } 1631b5133862SChris Mason 1632aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 1633aea52e19SAl Viro { 1634815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1635aea52e19SAl Viro kill_anon_super(sb); 1636aea52e19SAl Viro free_fs_info(fs_info); 1637aea52e19SAl Viro } 1638aea52e19SAl Viro 16392e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 16402e635a27SChris Mason .owner = THIS_MODULE, 16412e635a27SChris Mason .name = "btrfs", 1642061dbc6bSAl Viro .mount = btrfs_mount, 1643aea52e19SAl Viro .kill_sb = btrfs_kill_super, 16442e635a27SChris Mason .fs_flags = FS_REQUIRES_DEV, 16452e635a27SChris Mason }; 16467f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 1647a9218f6bSChris Mason 1648d352ac68SChris Mason /* 1649d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 1650d352ac68SChris Mason */ 16518a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 16528a4b83ccSChris Mason unsigned long arg) 16538a4b83ccSChris Mason { 16548a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 16558a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 1656c071fcfdSChris Mason int ret = -ENOTTY; 16578a4b83ccSChris Mason 1658e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1659e441d54dSChris Mason return -EPERM; 1660e441d54dSChris Mason 1661dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 1662dae7b665SLi Zefan if (IS_ERR(vol)) 1663dae7b665SLi Zefan return PTR_ERR(vol); 1664c071fcfdSChris Mason 16658a4b83ccSChris Mason switch (cmd) { 16668a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 166797288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 16688a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 16698a4b83ccSChris Mason break; 167002db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 167102db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 167202db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 167302db0844SJosef Bacik if (ret) 167402db0844SJosef Bacik break; 167502db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 167602db0844SJosef Bacik break; 16778a4b83ccSChris Mason } 1678dae7b665SLi Zefan 16798a4b83ccSChris Mason kfree(vol); 1680f819d837SLinda Knippers return ret; 16818a4b83ccSChris Mason } 16828a4b83ccSChris Mason 16830176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 1684ed0dab6bSYan { 1685354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 1686354aa0fbSMiao Xie struct btrfs_root *root = btrfs_sb(sb)->tree_root; 1687354aa0fbSMiao Xie 1688d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 1689354aa0fbSMiao Xie if (IS_ERR(trans)) { 1690354aa0fbSMiao Xie /* no transaction, don't bother */ 1691354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 16920176260fSLinus Torvalds return 0; 1693354aa0fbSMiao Xie return PTR_ERR(trans); 1694354aa0fbSMiao Xie } 1695354aa0fbSMiao Xie return btrfs_commit_transaction(trans, root); 1696ed0dab6bSYan } 1697ed0dab6bSYan 16980176260fSLinus Torvalds static int btrfs_unfreeze(struct super_block *sb) 1699ed0dab6bSYan { 17000176260fSLinus Torvalds return 0; 1701ed0dab6bSYan } 17022e635a27SChris Mason 17039c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 17049c5085c1SJosef Bacik { 17059c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 17069c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 17079c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 17089c5085c1SJosef Bacik struct list_head *head; 17099c5085c1SJosef Bacik struct rcu_string *name; 17109c5085c1SJosef Bacik 17119c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 17129c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 17139c5085c1SJosef Bacik while (cur_devices) { 17149c5085c1SJosef Bacik head = &cur_devices->devices; 17159c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 1716aa9ddcd4SJosef Bacik if (dev->missing) 1717aa9ddcd4SJosef Bacik continue; 17189c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 17199c5085c1SJosef Bacik first_dev = dev; 17209c5085c1SJosef Bacik } 17219c5085c1SJosef Bacik cur_devices = cur_devices->seed; 17229c5085c1SJosef Bacik } 17239c5085c1SJosef Bacik 17249c5085c1SJosef Bacik if (first_dev) { 17259c5085c1SJosef Bacik rcu_read_lock(); 17269c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 17279c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 17289c5085c1SJosef Bacik rcu_read_unlock(); 17299c5085c1SJosef Bacik } else { 17309c5085c1SJosef Bacik WARN_ON(1); 17319c5085c1SJosef Bacik } 17329c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 17339c5085c1SJosef Bacik return 0; 17349c5085c1SJosef Bacik } 17359c5085c1SJosef Bacik 1736b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 173776dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 1738bd555975SAl Viro .evict_inode = btrfs_evict_inode, 1739e20d96d6SChris Mason .put_super = btrfs_put_super, 1740d5719762SChris Mason .sync_fs = btrfs_sync_fs, 1741a9572a15SEric Paris .show_options = btrfs_show_options, 17429c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 17434730a4bcSChris Mason .write_inode = btrfs_write_inode, 17442c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 17452c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 17468fd17795SChris Mason .statfs = btrfs_statfs, 1747c146afadSYan Zheng .remount_fs = btrfs_remount, 17480176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 17490176260fSLinus Torvalds .unfreeze_fs = btrfs_unfreeze, 1750e20d96d6SChris Mason }; 1751a9218f6bSChris Mason 1752a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 1753a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 1754a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 1755a9218f6bSChris Mason .owner = THIS_MODULE, 17566038f373SArnd Bergmann .llseek = noop_llseek, 1757a9218f6bSChris Mason }; 1758a9218f6bSChris Mason 1759a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 1760578454ffSKay Sievers .minor = BTRFS_MINOR, 1761a9218f6bSChris Mason .name = "btrfs-control", 1762a9218f6bSChris Mason .fops = &btrfs_ctl_fops 1763a9218f6bSChris Mason }; 1764a9218f6bSChris Mason 1765578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 1766578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 1767578454ffSKay Sievers 1768a9218f6bSChris Mason static int btrfs_interface_init(void) 1769a9218f6bSChris Mason { 1770a9218f6bSChris Mason return misc_register(&btrfs_misc); 1771a9218f6bSChris Mason } 1772a9218f6bSChris Mason 1773b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 1774a9218f6bSChris Mason { 1775a9218f6bSChris Mason if (misc_deregister(&btrfs_misc) < 0) 177648940662SDaniel J Blueman printk(KERN_INFO "btrfs: misc_deregister failed for control device\n"); 1777a9218f6bSChris Mason } 1778a9218f6bSChris Mason 177985965600SDavid Sterba static void btrfs_print_info(void) 178085965600SDavid Sterba { 178185965600SDavid Sterba printk(KERN_INFO "Btrfs loaded" 178285965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 178385965600SDavid Sterba ", debug=on" 178485965600SDavid Sterba #endif 178579556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 178679556c3dSStefan Behrens ", assert=on" 178779556c3dSStefan Behrens #endif 178885965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 178985965600SDavid Sterba ", integrity-checker=on" 179085965600SDavid Sterba #endif 179185965600SDavid Sterba "\n"); 179285965600SDavid Sterba } 179385965600SDavid Sterba 1794dc11dd5dSJosef Bacik static int btrfs_run_sanity_tests(void) 1795dc11dd5dSJosef Bacik { 179606ea65a3SJosef Bacik int ret; 179706ea65a3SJosef Bacik 1798294e30feSJosef Bacik ret = btrfs_init_test_fs(); 179906ea65a3SJosef Bacik if (ret) 180006ea65a3SJosef Bacik return ret; 1801294e30feSJosef Bacik 1802294e30feSJosef Bacik ret = btrfs_test_free_space_cache(); 1803294e30feSJosef Bacik if (ret) 1804294e30feSJosef Bacik goto out; 1805294e30feSJosef Bacik ret = btrfs_test_extent_buffer_operations(); 1806294e30feSJosef Bacik if (ret) 1807294e30feSJosef Bacik goto out; 1808294e30feSJosef Bacik ret = btrfs_test_extent_io(); 1809aaedb55bSJosef Bacik if (ret) 1810aaedb55bSJosef Bacik goto out; 1811aaedb55bSJosef Bacik ret = btrfs_test_inodes(); 1812294e30feSJosef Bacik out: 1813294e30feSJosef Bacik btrfs_destroy_test_fs(); 1814294e30feSJosef Bacik return ret; 1815dc11dd5dSJosef Bacik } 1816dc11dd5dSJosef Bacik 18172e635a27SChris Mason static int __init init_btrfs_fs(void) 18182e635a27SChris Mason { 18192c90e5d6SChris Mason int err; 182058176a96SJosef Bacik 182158176a96SJosef Bacik err = btrfs_init_sysfs(); 182258176a96SJosef Bacik if (err) 182358176a96SJosef Bacik return err; 182458176a96SJosef Bacik 1825143bede5SJeff Mahoney btrfs_init_compress(); 1826d1310b2eSChris Mason 1827261507a0SLi Zefan err = btrfs_init_cachep(); 1828261507a0SLi Zefan if (err) 1829261507a0SLi Zefan goto free_compress; 1830261507a0SLi Zefan 1831d1310b2eSChris Mason err = extent_io_init(); 18322f4cbe64SWyatt Banks if (err) 18332f4cbe64SWyatt Banks goto free_cachep; 18342f4cbe64SWyatt Banks 1835d1310b2eSChris Mason err = extent_map_init(); 1836d1310b2eSChris Mason if (err) 1837d1310b2eSChris Mason goto free_extent_io; 1838d1310b2eSChris Mason 18396352b91dSMiao Xie err = ordered_data_init(); 18402f4cbe64SWyatt Banks if (err) 18412f4cbe64SWyatt Banks goto free_extent_map; 1842c8b97818SChris Mason 18436352b91dSMiao Xie err = btrfs_delayed_inode_init(); 18446352b91dSMiao Xie if (err) 18456352b91dSMiao Xie goto free_ordered_data; 18466352b91dSMiao Xie 18479247f317SMiao Xie err = btrfs_auto_defrag_init(); 184816cdcec7SMiao Xie if (err) 184916cdcec7SMiao Xie goto free_delayed_inode; 185016cdcec7SMiao Xie 185178a6184aSMiao Xie err = btrfs_delayed_ref_init(); 18529247f317SMiao Xie if (err) 18539247f317SMiao Xie goto free_auto_defrag; 18549247f317SMiao Xie 1855b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 1856b9e9a6cbSWang Shilong if (err) 1857b9e9a6cbSWang Shilong goto free_prelim_ref; 1858b9e9a6cbSWang Shilong 185978a6184aSMiao Xie err = btrfs_interface_init(); 186078a6184aSMiao Xie if (err) 186178a6184aSMiao Xie goto free_delayed_ref; 186278a6184aSMiao Xie 1863e565d4b9SJan Schmidt btrfs_init_lockdep(); 1864e565d4b9SJan Schmidt 186585965600SDavid Sterba btrfs_print_info(); 1866dc11dd5dSJosef Bacik 1867dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 1868dc11dd5dSJosef Bacik if (err) 1869dc11dd5dSJosef Bacik goto unregister_ioctl; 1870dc11dd5dSJosef Bacik 1871dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 1872dc11dd5dSJosef Bacik if (err) 1873dc11dd5dSJosef Bacik goto unregister_ioctl; 187474255aa0SJosef Bacik 18752f4cbe64SWyatt Banks return 0; 18762f4cbe64SWyatt Banks 1877a9218f6bSChris Mason unregister_ioctl: 1878a9218f6bSChris Mason btrfs_interface_exit(); 1879b9e9a6cbSWang Shilong free_prelim_ref: 1880b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 188178a6184aSMiao Xie free_delayed_ref: 188278a6184aSMiao Xie btrfs_delayed_ref_exit(); 18839247f317SMiao Xie free_auto_defrag: 18849247f317SMiao Xie btrfs_auto_defrag_exit(); 188516cdcec7SMiao Xie free_delayed_inode: 188616cdcec7SMiao Xie btrfs_delayed_inode_exit(); 18876352b91dSMiao Xie free_ordered_data: 18886352b91dSMiao Xie ordered_data_exit(); 18892f4cbe64SWyatt Banks free_extent_map: 18902f4cbe64SWyatt Banks extent_map_exit(); 1891d1310b2eSChris Mason free_extent_io: 1892d1310b2eSChris Mason extent_io_exit(); 18932f4cbe64SWyatt Banks free_cachep: 18942f4cbe64SWyatt Banks btrfs_destroy_cachep(); 1895261507a0SLi Zefan free_compress: 1896261507a0SLi Zefan btrfs_exit_compress(); 18972f4cbe64SWyatt Banks btrfs_exit_sysfs(); 18982c90e5d6SChris Mason return err; 18992e635a27SChris Mason } 19002e635a27SChris Mason 19012e635a27SChris Mason static void __exit exit_btrfs_fs(void) 19022e635a27SChris Mason { 190339279cc3SChris Mason btrfs_destroy_cachep(); 190478a6184aSMiao Xie btrfs_delayed_ref_exit(); 19059247f317SMiao Xie btrfs_auto_defrag_exit(); 190616cdcec7SMiao Xie btrfs_delayed_inode_exit(); 1907b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 19086352b91dSMiao Xie ordered_data_exit(); 1909a52d9a80SChris Mason extent_map_exit(); 1910d1310b2eSChris Mason extent_io_exit(); 1911a9218f6bSChris Mason btrfs_interface_exit(); 19122e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 191358176a96SJosef Bacik btrfs_exit_sysfs(); 19148a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 1915261507a0SLi Zefan btrfs_exit_compress(); 19162e635a27SChris Mason } 19172e635a27SChris Mason 19182e635a27SChris Mason module_init(init_btrfs_fs) 19192e635a27SChris Mason module_exit(exit_btrfs_fs) 19202e635a27SChris Mason 19212e635a27SChris Mason MODULE_LICENSE("GPL"); 1922