16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 194b82d6e4SYan #include <linux/blkdev.h> 202e635a27SChris Mason #include <linux/module.h> 21e20d96d6SChris Mason #include <linux/buffer_head.h> 222e635a27SChris Mason #include <linux/fs.h> 232e635a27SChris Mason #include <linux/pagemap.h> 242e635a27SChris Mason #include <linux/highmem.h> 252e635a27SChris Mason #include <linux/time.h> 262e635a27SChris Mason #include <linux/init.h> 27a9572a15SEric Paris #include <linux/seq_file.h> 282e635a27SChris Mason #include <linux/string.h> 292e635a27SChris Mason #include <linux/backing-dev.h> 304b82d6e4SYan #include <linux/mount.h> 31dee26a9fSChris Mason #include <linux/mpage.h> 3275dfe396SChris Mason #include <linux/swap.h> 3375dfe396SChris Mason #include <linux/writeback.h> 348fd17795SChris Mason #include <linux/statfs.h> 3508607c1bSChris Mason #include <linux/compat.h> 3695e05289SChris Mason #include <linux/parser.h> 37c59f8951SChris Mason #include <linux/ctype.h> 386da6abaeSChris Mason #include <linux/namei.h> 39a9218f6bSChris Mason #include <linux/miscdevice.h> 401bcbf313SQinghuang Feng #include <linux/magic.h> 415a0e3ad6STejun Heo #include <linux/slab.h> 4290a887c9SDan Magenheimer #include <linux/cleancache.h> 4322c44fe6SJosef Bacik #include <linux/ratelimit.h> 4455e301fdSFilipe Brandenburger #include <linux/btrfs.h> 4516cdcec7SMiao Xie #include "delayed-inode.h" 462e635a27SChris Mason #include "ctree.h" 47e20d96d6SChris Mason #include "disk-io.h" 48d5719762SChris Mason #include "transaction.h" 492c90e5d6SChris Mason #include "btrfs_inode.h" 503a686375SChris Mason #include "print-tree.h" 5114a958e6SFilipe David Borba Manana #include "hash.h" 5263541927SFilipe David Borba Manana #include "props.h" 535103e947SJosef Bacik #include "xattr.h" 548a4b83ccSChris Mason #include "volumes.h" 55be6e8dc0SBalaji Rao #include "export.h" 56c8b97818SChris Mason #include "compression.h" 579c5085c1SJosef Bacik #include "rcu-string.h" 588dabb742SStefan Behrens #include "dev-replace.h" 5974255aa0SJosef Bacik #include "free-space-cache.h" 60b9e9a6cbSWang Shilong #include "backref.h" 61dc11dd5dSJosef Bacik #include "tests/btrfs-tests.h" 622e635a27SChris Mason 63d3982100SMark Fasheh #include "qgroup.h" 641abe9b8aSliubo #define CREATE_TRACE_POINTS 651abe9b8aSliubo #include <trace/events/btrfs.h> 661abe9b8aSliubo 67b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 68830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 69e20d96d6SChris Mason 700723a047SHarald Hoyer static int btrfs_remount(struct super_block *sb, int *flags, char *data); 710723a047SHarald Hoyer 72e33e17eeSJeff Mahoney const char *btrfs_decode_error(int errno) 73acce952bSliubo { 7408748810SDavid Sterba char *errstr = "unknown"; 75acce952bSliubo 76acce952bSliubo switch (errno) { 77acce952bSliubo case -EIO: 78acce952bSliubo errstr = "IO failure"; 79acce952bSliubo break; 80acce952bSliubo case -ENOMEM: 81acce952bSliubo errstr = "Out of memory"; 82acce952bSliubo break; 83acce952bSliubo case -EROFS: 84acce952bSliubo errstr = "Readonly filesystem"; 85acce952bSliubo break; 868c342930SJeff Mahoney case -EEXIST: 878c342930SJeff Mahoney errstr = "Object already exists"; 888c342930SJeff Mahoney break; 8994ef7280SDavid Sterba case -ENOSPC: 9094ef7280SDavid Sterba errstr = "No space left"; 9194ef7280SDavid Sterba break; 9294ef7280SDavid Sterba case -ENOENT: 9394ef7280SDavid Sterba errstr = "No such entry"; 9494ef7280SDavid Sterba break; 95acce952bSliubo } 96acce952bSliubo 97acce952bSliubo return errstr; 98acce952bSliubo } 99acce952bSliubo 100bbece8a3SDavid Sterba static void save_error_info(struct btrfs_fs_info *fs_info) 101acce952bSliubo { 102acce952bSliubo /* 103acce952bSliubo * today we only save the error info into ram. Long term we'll 104acce952bSliubo * also send it down to the disk 105acce952bSliubo */ 10687533c47SMiao Xie set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 107acce952bSliubo } 108acce952bSliubo 109acce952bSliubo /* btrfs handle error by forcing the filesystem readonly */ 110acce952bSliubo static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 111acce952bSliubo { 112acce952bSliubo struct super_block *sb = fs_info->sb; 113acce952bSliubo 114acce952bSliubo if (sb->s_flags & MS_RDONLY) 115acce952bSliubo return; 116acce952bSliubo 11787533c47SMiao Xie if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { 118acce952bSliubo sb->s_flags |= MS_RDONLY; 119c2cf52ebSSimon Kirby btrfs_info(fs_info, "forced readonly"); 1201acd6831SStefan Behrens /* 1211acd6831SStefan Behrens * Note that a running device replace operation is not 1221acd6831SStefan Behrens * canceled here although there is no way to update 1231acd6831SStefan Behrens * the progress. It would add the risk of a deadlock, 1241acd6831SStefan Behrens * therefore the canceling is ommited. The only penalty 1251acd6831SStefan Behrens * is that some I/O remains active until the procedure 1261acd6831SStefan Behrens * completes. The next time when the filesystem is 1271acd6831SStefan Behrens * mounted writeable again, the device replace 1281acd6831SStefan Behrens * operation continues. 1291acd6831SStefan Behrens */ 130acce952bSliubo } 131acce952bSliubo } 132acce952bSliubo 133acce952bSliubo /* 134*34d97007SAnand Jain * __btrfs_handle_fs_error decodes expected errors from the caller and 135acce952bSliubo * invokes the approciate error response. 136acce952bSliubo */ 137c0d19e2bSDavid Sterba __cold 138*34d97007SAnand Jain void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 1394da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 140acce952bSliubo { 141acce952bSliubo struct super_block *sb = fs_info->sb; 14257d816a1SAnand Jain #ifdef CONFIG_PRINTK 143acce952bSliubo const char *errstr; 14457d816a1SAnand Jain #endif 145acce952bSliubo 146acce952bSliubo /* 147acce952bSliubo * Special case: if the error is EROFS, and we're already 148acce952bSliubo * under MS_RDONLY, then it is safe here. 149acce952bSliubo */ 150acce952bSliubo if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 151acce952bSliubo return; 152acce952bSliubo 15357d816a1SAnand Jain #ifdef CONFIG_PRINTK 15408748810SDavid Sterba errstr = btrfs_decode_error(errno); 1554da35113SJeff Mahoney if (fmt) { 15637252a66SEric Sandeen struct va_format vaf; 15737252a66SEric Sandeen va_list args; 15837252a66SEric Sandeen 15937252a66SEric Sandeen va_start(args, fmt); 16037252a66SEric Sandeen vaf.fmt = fmt; 16137252a66SEric Sandeen vaf.va = &args; 1624da35113SJeff Mahoney 163efe120a0SFrank Holton printk(KERN_CRIT 164efe120a0SFrank Holton "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", 16508748810SDavid Sterba sb->s_id, function, line, errno, errstr, &vaf); 16637252a66SEric Sandeen va_end(args); 1674da35113SJeff Mahoney } else { 168efe120a0SFrank Holton printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", 16908748810SDavid Sterba sb->s_id, function, line, errno, errstr); 1704da35113SJeff Mahoney } 17157d816a1SAnand Jain #endif 172acce952bSliubo 1734da35113SJeff Mahoney /* Don't go through full error handling during mount */ 1744da35113SJeff Mahoney save_error_info(fs_info); 175cf79ffb5SJosef Bacik if (sb->s_flags & MS_BORN) 176acce952bSliubo btrfs_handle_error(fs_info); 177acce952bSliubo } 1784da35113SJeff Mahoney 17957d816a1SAnand Jain #ifdef CONFIG_PRINTK 180533574c6SJoe Perches static const char * const logtypes[] = { 1814da35113SJeff Mahoney "emergency", 1824da35113SJeff Mahoney "alert", 1834da35113SJeff Mahoney "critical", 1844da35113SJeff Mahoney "error", 1854da35113SJeff Mahoney "warning", 1864da35113SJeff Mahoney "notice", 1874da35113SJeff Mahoney "info", 1884da35113SJeff Mahoney "debug", 1894da35113SJeff Mahoney }; 1904da35113SJeff Mahoney 191c2cf52ebSSimon Kirby void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 1924da35113SJeff Mahoney { 1934da35113SJeff Mahoney struct super_block *sb = fs_info->sb; 1944da35113SJeff Mahoney char lvl[4]; 1954da35113SJeff Mahoney struct va_format vaf; 1964da35113SJeff Mahoney va_list args; 1974da35113SJeff Mahoney const char *type = logtypes[4]; 198533574c6SJoe Perches int kern_level; 1994da35113SJeff Mahoney 2004da35113SJeff Mahoney va_start(args, fmt); 2014da35113SJeff Mahoney 202533574c6SJoe Perches kern_level = printk_get_level(fmt); 203533574c6SJoe Perches if (kern_level) { 204533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 205533574c6SJoe Perches memcpy(lvl, fmt, size); 206533574c6SJoe Perches lvl[size] = '\0'; 207533574c6SJoe Perches fmt += size; 208533574c6SJoe Perches type = logtypes[kern_level - '0']; 2094da35113SJeff Mahoney } else 2104da35113SJeff Mahoney *lvl = '\0'; 2114da35113SJeff Mahoney 2124da35113SJeff Mahoney vaf.fmt = fmt; 2134da35113SJeff Mahoney vaf.va = &args; 214533574c6SJoe Perches 215c2cf52ebSSimon Kirby printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); 216533574c6SJoe Perches 217533574c6SJoe Perches va_end(args); 2184da35113SJeff Mahoney } 219533574c6SJoe Perches #endif 220533574c6SJoe Perches 2218c342930SJeff Mahoney /* 22249b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 22349b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 22449b25e05SJeff Mahoney * one. 22549b25e05SJeff Mahoney * 22649b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 22749b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 22849b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 22949b25e05SJeff Mahoney * in the call path but will return -EIO. 23049b25e05SJeff Mahoney * 23149b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 23249b25e05SJeff Mahoney * btrfs_commit_transaction. 23349b25e05SJeff Mahoney */ 234c0d19e2bSDavid Sterba __cold 23549b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 23649b25e05SJeff Mahoney struct btrfs_root *root, const char *function, 23749b25e05SJeff Mahoney unsigned int line, int errno) 23849b25e05SJeff Mahoney { 23949b25e05SJeff Mahoney trans->aborted = errno; 24049b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 24149b25e05SJeff Mahoney * transaction may be able to continue. */ 242c92f6be3SFilipe Manana if (!trans->blocks_used && list_empty(&trans->new_bgs)) { 24369ce977aSMiao Xie const char *errstr; 24469ce977aSMiao Xie 24508748810SDavid Sterba errstr = btrfs_decode_error(errno); 246c2cf52ebSSimon Kirby btrfs_warn(root->fs_info, 247c2cf52ebSSimon Kirby "%s:%d: Aborting unused transaction(%s).", 24869ce977aSMiao Xie function, line, errstr); 24949b25e05SJeff Mahoney return; 25049b25e05SJeff Mahoney } 2518d25a086SMiao Xie ACCESS_ONCE(trans->transaction->aborted) = errno; 252501407aaSJosef Bacik /* Wake up anybody who may be waiting on this transaction */ 253501407aaSJosef Bacik wake_up(&root->fs_info->transaction_wait); 254501407aaSJosef Bacik wake_up(&root->fs_info->transaction_blocked_wait); 255*34d97007SAnand Jain __btrfs_handle_fs_error(root->fs_info, function, line, errno, NULL); 25649b25e05SJeff Mahoney } 25749b25e05SJeff Mahoney /* 2588c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2598c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2608c342930SJeff Mahoney */ 261c0d19e2bSDavid Sterba __cold 2628c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2638c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2648c342930SJeff Mahoney { 2658c342930SJeff Mahoney char *s_id = "<unknown>"; 2668c342930SJeff Mahoney const char *errstr; 2678c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2688c342930SJeff Mahoney va_list args; 2698c342930SJeff Mahoney 2708c342930SJeff Mahoney if (fs_info) 2718c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2728c342930SJeff Mahoney 2738c342930SJeff Mahoney va_start(args, fmt); 2748c342930SJeff Mahoney vaf.va = &args; 2758c342930SJeff Mahoney 27608748810SDavid Sterba errstr = btrfs_decode_error(errno); 277aa43a17cSEric Sandeen if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) 27808748810SDavid Sterba panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 27908748810SDavid Sterba s_id, function, line, &vaf, errno, errstr); 2808c342930SJeff Mahoney 281efe120a0SFrank Holton btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 282efe120a0SFrank Holton function, line, &vaf, errno, errstr); 2838c342930SJeff Mahoney va_end(args); 2848c342930SJeff Mahoney /* Caller calls BUG() */ 2858c342930SJeff Mahoney } 286acce952bSliubo 287e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 288e20d96d6SChris Mason { 2893abdbd78SDavid Sterba close_ctree(btrfs_sb(sb)->tree_root); 290e20d96d6SChris Mason } 2912e635a27SChris Mason 29295e05289SChris Mason enum { 29373f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 294287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 295287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 296261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 297261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 29870f6d82eSOmar Sandoval Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, 29970f6d82eSOmar Sandoval Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, 30070f6d82eSOmar Sandoval Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, 30170f6d82eSOmar Sandoval Opt_skip_balance, Opt_check_integrity, 30270f6d82eSOmar Sandoval Opt_check_integrity_including_extent_data, 303f420ee1eSStefan Behrens Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, 304e07a2adeSQu Wenruo Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, 305a258af7aSQu Wenruo Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, 3068dcddfa0SQu Wenruo Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, 307fed8f166SQu Wenruo Opt_nologreplay, Opt_norecovery, 308d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 309d0bd4560SJosef Bacik Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, 310d0bd4560SJosef Bacik #endif 3119555c6c1SIlya Dryomov Opt_err, 31295e05289SChris Mason }; 31395e05289SChris Mason 3144d4ab6d6SDavid Sterba static const match_table_t tokens = { 315dfe25020SChris Mason {Opt_degraded, "degraded"}, 31695e05289SChris Mason {Opt_subvol, "subvol=%s"}, 3171493381fSWang Shilong {Opt_subvolid, "subvolid=%s"}, 31843e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 319b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 320d399167dSQu Wenruo {Opt_datasum, "datasum"}, 321be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 322a258af7aSQu Wenruo {Opt_datacow, "datacow"}, 32321ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 324842bef58SQu Wenruo {Opt_barrier, "barrier"}, 3256f568d35SChris Mason {Opt_max_inline, "max_inline=%s"}, 3268f662a76SChris Mason {Opt_alloc_start, "alloc_start=%s"}, 3274543df7eSChris Mason {Opt_thread_pool, "thread_pool=%d"}, 328c8b97818SChris Mason {Opt_compress, "compress"}, 329261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 330a555f810SChris Mason {Opt_compress_force, "compress-force"}, 331261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 332e18e4809SChris Mason {Opt_ssd, "ssd"}, 333451d7585SChris Mason {Opt_ssd_spread, "ssd_spread"}, 3343b30c22fSChris Mason {Opt_nossd, "nossd"}, 335bd0330adSQu Wenruo {Opt_acl, "acl"}, 33633268eafSJosef Bacik {Opt_noacl, "noacl"}, 3373a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 338a88998f2SQu Wenruo {Opt_treelog, "treelog"}, 33996da0919SQu Wenruo {Opt_nologreplay, "nologreplay"}, 340fed8f166SQu Wenruo {Opt_norecovery, "norecovery"}, 341dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 3422c9ee856SQu Wenruo {Opt_noflushoncommit, "noflushoncommit"}, 34397e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 344e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 345e07a2adeSQu Wenruo {Opt_nodiscard, "nodiscard"}, 3460af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 34770f6d82eSOmar Sandoval {Opt_space_cache_version, "space_cache=%s"}, 34888c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3494260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 35091435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 35153036293SQu Wenruo {Opt_noenospc_debug, "noenospc_debug"}, 352e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3534cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 354fc0ca9afSQu Wenruo {Opt_nodefrag, "noautodefrag"}, 3554b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3563818aea2SQu Wenruo {Opt_noinode_cache, "noinode_cache"}, 3578965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 3588dcddfa0SQu Wenruo {Opt_recovery, "recovery"}, /* deprecated */ 3598dcddfa0SQu Wenruo {Opt_usebackuproot, "usebackuproot"}, 3609555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 36121adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 36221adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 36321adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 364f420ee1eSStefan Behrens {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, 3658c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 3668b87dc17SDavid Sterba {Opt_commit_interval, "commit=%d"}, 367d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 368d0bd4560SJosef Bacik {Opt_fragment_data, "fragment=data"}, 369d0bd4560SJosef Bacik {Opt_fragment_metadata, "fragment=metadata"}, 370d0bd4560SJosef Bacik {Opt_fragment_all, "fragment=all"}, 371d0bd4560SJosef Bacik #endif 37233268eafSJosef Bacik {Opt_err, NULL}, 37395e05289SChris Mason }; 37495e05289SChris Mason 375edf24abeSChristoph Hellwig /* 376edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 377edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 37849b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 379edf24abeSChristoph Hellwig */ 38096da0919SQu Wenruo int btrfs_parse_options(struct btrfs_root *root, char *options, 38196da0919SQu Wenruo unsigned long new_flags) 38295e05289SChris Mason { 383edf24abeSChristoph Hellwig struct btrfs_fs_info *info = root->fs_info; 38495e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 38573bc1876SJosef Bacik char *p, *num, *orig = NULL; 38673bc1876SJosef Bacik u64 cache_gen; 3874543df7eSChris Mason int intarg; 388a7a3f7caSSage Weil int ret = 0; 389261507a0SLi Zefan char *compress_type; 390261507a0SLi Zefan bool compress_force = false; 391b7c47bbbSTsutomu Itoh enum btrfs_compression_type saved_compress_type; 392b7c47bbbSTsutomu Itoh bool saved_compress_force; 393b7c47bbbSTsutomu Itoh int no_compress = 0; 394b6cda9bcSChris Mason 3956c41761fSDavid Sterba cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 39670f6d82eSOmar Sandoval if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) 39770f6d82eSOmar Sandoval btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); 39870f6d82eSOmar Sandoval else if (cache_gen) 39973bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 40073bc1876SJosef Bacik 40196da0919SQu Wenruo /* 40296da0919SQu Wenruo * Even the options are empty, we still need to do extra check 40396da0919SQu Wenruo * against new flags 40496da0919SQu Wenruo */ 40595e05289SChris Mason if (!options) 40696da0919SQu Wenruo goto check; 40795e05289SChris Mason 408be20aa9dSChris Mason /* 409be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 410be20aa9dSChris Mason * gets called twice 411be20aa9dSChris Mason */ 412be20aa9dSChris Mason options = kstrdup(options, GFP_NOFS); 413be20aa9dSChris Mason if (!options) 414be20aa9dSChris Mason return -ENOMEM; 415be20aa9dSChris Mason 416da495eccSJosef Bacik orig = options; 417be20aa9dSChris Mason 41895e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 41995e05289SChris Mason int token; 42095e05289SChris Mason if (!*p) 42195e05289SChris Mason continue; 42295e05289SChris Mason 42395e05289SChris Mason token = match_token(p, tokens, args); 42495e05289SChris Mason switch (token) { 425dfe25020SChris Mason case Opt_degraded: 426efe120a0SFrank Holton btrfs_info(root->fs_info, "allowing degraded mounts"); 427dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 428dfe25020SChris Mason break; 42995e05289SChris Mason case Opt_subvol: 43073f73415SJosef Bacik case Opt_subvolid: 431e15d0542SXin Zhong case Opt_subvolrootid: 43243e570b0SChristoph Hellwig case Opt_device: 433edf24abeSChristoph Hellwig /* 43443e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 435edf24abeSChristoph Hellwig * and can be happily ignored here. 436edf24abeSChristoph Hellwig */ 43795e05289SChris Mason break; 438b6cda9bcSChris Mason case Opt_nodatasum: 43907802534SQu Wenruo btrfs_set_and_info(root, NODATASUM, 44007802534SQu Wenruo "setting nodatasum"); 441be20aa9dSChris Mason break; 442d399167dSQu Wenruo case Opt_datasum: 44307802534SQu Wenruo if (btrfs_test_opt(root, NODATASUM)) { 444d399167dSQu Wenruo if (btrfs_test_opt(root, NODATACOW)) 445d399167dSQu Wenruo btrfs_info(root->fs_info, "setting datasum, datacow enabled"); 446d399167dSQu Wenruo else 447d399167dSQu Wenruo btrfs_info(root->fs_info, "setting datasum"); 44807802534SQu Wenruo } 449d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATACOW); 450d399167dSQu Wenruo btrfs_clear_opt(info->mount_opt, NODATASUM); 451d399167dSQu Wenruo break; 452be20aa9dSChris Mason case Opt_nodatacow: 45307802534SQu Wenruo if (!btrfs_test_opt(root, NODATACOW)) { 454bedb2ccaSAndrei Popa if (!btrfs_test_opt(root, COMPRESS) || 455bedb2ccaSAndrei Popa !btrfs_test_opt(root, FORCE_COMPRESS)) { 456efe120a0SFrank Holton btrfs_info(root->fs_info, 457efe120a0SFrank Holton "setting nodatacow, compression disabled"); 458bedb2ccaSAndrei Popa } else { 459efe120a0SFrank Holton btrfs_info(root->fs_info, "setting nodatacow"); 460bedb2ccaSAndrei Popa } 46107802534SQu Wenruo } 462bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, COMPRESS); 463bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 464be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 465be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 466b6cda9bcSChris Mason break; 467a258af7aSQu Wenruo case Opt_datacow: 46807802534SQu Wenruo btrfs_clear_and_info(root, NODATACOW, 46907802534SQu Wenruo "setting datacow"); 470a258af7aSQu Wenruo break; 471a555f810SChris Mason case Opt_compress_force: 472261507a0SLi Zefan case Opt_compress_force_type: 473261507a0SLi Zefan compress_force = true; 4741c697d4aSEric Sandeen /* Fallthrough */ 475261507a0SLi Zefan case Opt_compress: 476261507a0SLi Zefan case Opt_compress_type: 477b7c47bbbSTsutomu Itoh saved_compress_type = btrfs_test_opt(root, COMPRESS) ? 478b7c47bbbSTsutomu Itoh info->compress_type : BTRFS_COMPRESS_NONE; 479b7c47bbbSTsutomu Itoh saved_compress_force = 480b7c47bbbSTsutomu Itoh btrfs_test_opt(root, FORCE_COMPRESS); 481261507a0SLi Zefan if (token == Opt_compress || 482261507a0SLi Zefan token == Opt_compress_force || 483261507a0SLi Zefan strcmp(args[0].from, "zlib") == 0) { 484261507a0SLi Zefan compress_type = "zlib"; 485261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 486063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 487bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 488bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 489b7c47bbbSTsutomu Itoh no_compress = 0; 490a6fa6faeSLi Zefan } else if (strcmp(args[0].from, "lzo") == 0) { 491a6fa6faeSLi Zefan compress_type = "lzo"; 492a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 493063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 494bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATACOW); 495bedb2ccaSAndrei Popa btrfs_clear_opt(info->mount_opt, NODATASUM); 4962b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 497b7c47bbbSTsutomu Itoh no_compress = 0; 498063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 499063849eaSArnd Hannemann compress_type = "no"; 500063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 501063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 502063849eaSArnd Hannemann compress_force = false; 503b7c47bbbSTsutomu Itoh no_compress++; 504261507a0SLi Zefan } else { 505261507a0SLi Zefan ret = -EINVAL; 506261507a0SLi Zefan goto out; 507261507a0SLi Zefan } 508261507a0SLi Zefan 509261507a0SLi Zefan if (compress_force) { 510b7c47bbbSTsutomu Itoh btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 511143f3636SDavid Sterba } else { 5124027e0f4SWang Shilong /* 5134027e0f4SWang Shilong * If we remount from compress-force=xxx to 5144027e0f4SWang Shilong * compress=xxx, we need clear FORCE_COMPRESS 5154027e0f4SWang Shilong * flag, otherwise, there is no way for users 5164027e0f4SWang Shilong * to disable forcible compression separately. 5174027e0f4SWang Shilong */ 5184027e0f4SWang Shilong btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 519a7e252afSMiao Xie } 520b7c47bbbSTsutomu Itoh if ((btrfs_test_opt(root, COMPRESS) && 521b7c47bbbSTsutomu Itoh (info->compress_type != saved_compress_type || 522b7c47bbbSTsutomu Itoh compress_force != saved_compress_force)) || 523b7c47bbbSTsutomu Itoh (!btrfs_test_opt(root, COMPRESS) && 524b7c47bbbSTsutomu Itoh no_compress == 1)) { 525b7c47bbbSTsutomu Itoh btrfs_info(root->fs_info, 526b7c47bbbSTsutomu Itoh "%s %s compression", 527b7c47bbbSTsutomu Itoh (compress_force) ? "force" : "use", 528b7c47bbbSTsutomu Itoh compress_type); 529b7c47bbbSTsutomu Itoh } 530b7c47bbbSTsutomu Itoh compress_force = false; 531a555f810SChris Mason break; 532e18e4809SChris Mason case Opt_ssd: 53307802534SQu Wenruo btrfs_set_and_info(root, SSD, 53407802534SQu Wenruo "use ssd allocation scheme"); 535e18e4809SChris Mason break; 536451d7585SChris Mason case Opt_ssd_spread: 53707802534SQu Wenruo btrfs_set_and_info(root, SSD_SPREAD, 53807802534SQu Wenruo "use spread ssd allocation scheme"); 5392aa06a35SEric Sandeen btrfs_set_opt(info->mount_opt, SSD); 540451d7585SChris Mason break; 5413b30c22fSChris Mason case Opt_nossd: 5422aa06a35SEric Sandeen btrfs_set_and_info(root, NOSSD, 54307802534SQu Wenruo "not using ssd allocation scheme"); 5443b30c22fSChris Mason btrfs_clear_opt(info->mount_opt, SSD); 5453b30c22fSChris Mason break; 546842bef58SQu Wenruo case Opt_barrier: 54707802534SQu Wenruo btrfs_clear_and_info(root, NOBARRIER, 54807802534SQu Wenruo "turning on barriers"); 549842bef58SQu Wenruo break; 55021ad10cfSChris Mason case Opt_nobarrier: 55107802534SQu Wenruo btrfs_set_and_info(root, NOBARRIER, 55207802534SQu Wenruo "turning off barriers"); 55321ad10cfSChris Mason break; 5544543df7eSChris Mason case Opt_thread_pool: 5552c334e87SWang Shilong ret = match_int(&args[0], &intarg); 5562c334e87SWang Shilong if (ret) { 5572c334e87SWang Shilong goto out; 5582c334e87SWang Shilong } else if (intarg > 0) { 5594543df7eSChris Mason info->thread_pool_size = intarg; 5602c334e87SWang Shilong } else { 5612c334e87SWang Shilong ret = -EINVAL; 5622c334e87SWang Shilong goto out; 5632c334e87SWang Shilong } 5644543df7eSChris Mason break; 5656f568d35SChris Mason case Opt_max_inline: 566edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5676f568d35SChris Mason if (num) { 56891748467SAkinobu Mita info->max_inline = memparse(num, NULL); 5696f568d35SChris Mason kfree(num); 5706f568d35SChris Mason 57115ada040SChris Mason if (info->max_inline) { 572feb5f965SMitch Harder info->max_inline = min_t(u64, 57315ada040SChris Mason info->max_inline, 57415ada040SChris Mason root->sectorsize); 57515ada040SChris Mason } 576efe120a0SFrank Holton btrfs_info(root->fs_info, "max_inline at %llu", 577c1c9ff7cSGeert Uytterhoeven info->max_inline); 5782c334e87SWang Shilong } else { 5792c334e87SWang Shilong ret = -ENOMEM; 5802c334e87SWang Shilong goto out; 5816f568d35SChris Mason } 5826f568d35SChris Mason break; 5838f662a76SChris Mason case Opt_alloc_start: 584edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 5858f662a76SChris Mason if (num) { 586c018daecSMiao Xie mutex_lock(&info->chunk_mutex); 58791748467SAkinobu Mita info->alloc_start = memparse(num, NULL); 588c018daecSMiao Xie mutex_unlock(&info->chunk_mutex); 5898f662a76SChris Mason kfree(num); 590efe120a0SFrank Holton btrfs_info(root->fs_info, "allocations start at %llu", 591c1c9ff7cSGeert Uytterhoeven info->alloc_start); 5922c334e87SWang Shilong } else { 5932c334e87SWang Shilong ret = -ENOMEM; 5942c334e87SWang Shilong goto out; 5958f662a76SChris Mason } 5968f662a76SChris Mason break; 597bd0330adSQu Wenruo case Opt_acl: 59845ff35d6SGuangliang Zhao #ifdef CONFIG_BTRFS_FS_POSIX_ACL 599bd0330adSQu Wenruo root->fs_info->sb->s_flags |= MS_POSIXACL; 600bd0330adSQu Wenruo break; 60145ff35d6SGuangliang Zhao #else 60245ff35d6SGuangliang Zhao btrfs_err(root->fs_info, 60345ff35d6SGuangliang Zhao "support for ACL not compiled in!"); 60445ff35d6SGuangliang Zhao ret = -EINVAL; 60545ff35d6SGuangliang Zhao goto out; 60645ff35d6SGuangliang Zhao #endif 60733268eafSJosef Bacik case Opt_noacl: 60833268eafSJosef Bacik root->fs_info->sb->s_flags &= ~MS_POSIXACL; 60933268eafSJosef Bacik break; 6103a5e1404SSage Weil case Opt_notreelog: 61107802534SQu Wenruo btrfs_set_and_info(root, NOTREELOG, 61207802534SQu Wenruo "disabling tree log"); 6133a5e1404SSage Weil break; 614a88998f2SQu Wenruo case Opt_treelog: 61507802534SQu Wenruo btrfs_clear_and_info(root, NOTREELOG, 61607802534SQu Wenruo "enabling tree log"); 617a88998f2SQu Wenruo break; 618fed8f166SQu Wenruo case Opt_norecovery: 61996da0919SQu Wenruo case Opt_nologreplay: 62096da0919SQu Wenruo btrfs_set_and_info(root, NOLOGREPLAY, 62196da0919SQu Wenruo "disabling log replay at mount time"); 62296da0919SQu Wenruo break; 623dccae999SSage Weil case Opt_flushoncommit: 62407802534SQu Wenruo btrfs_set_and_info(root, FLUSHONCOMMIT, 62507802534SQu Wenruo "turning on flush-on-commit"); 626dccae999SSage Weil break; 6272c9ee856SQu Wenruo case Opt_noflushoncommit: 62807802534SQu Wenruo btrfs_clear_and_info(root, FLUSHONCOMMIT, 62907802534SQu Wenruo "turning off flush-on-commit"); 6302c9ee856SQu Wenruo break; 63197e728d4SJosef Bacik case Opt_ratio: 6322c334e87SWang Shilong ret = match_int(&args[0], &intarg); 6332c334e87SWang Shilong if (ret) { 6342c334e87SWang Shilong goto out; 6352c334e87SWang Shilong } else if (intarg >= 0) { 63697e728d4SJosef Bacik info->metadata_ratio = intarg; 637efe120a0SFrank Holton btrfs_info(root->fs_info, "metadata ratio %d", 63897e728d4SJosef Bacik info->metadata_ratio); 6392c334e87SWang Shilong } else { 6402c334e87SWang Shilong ret = -EINVAL; 6412c334e87SWang Shilong goto out; 64297e728d4SJosef Bacik } 64397e728d4SJosef Bacik break; 644e244a0aeSChristoph Hellwig case Opt_discard: 64507802534SQu Wenruo btrfs_set_and_info(root, DISCARD, 64607802534SQu Wenruo "turning on discard"); 647e244a0aeSChristoph Hellwig break; 648e07a2adeSQu Wenruo case Opt_nodiscard: 64907802534SQu Wenruo btrfs_clear_and_info(root, DISCARD, 65007802534SQu Wenruo "turning off discard"); 651e07a2adeSQu Wenruo break; 6520af3d00bSJosef Bacik case Opt_space_cache: 65370f6d82eSOmar Sandoval case Opt_space_cache_version: 65470f6d82eSOmar Sandoval if (token == Opt_space_cache || 65570f6d82eSOmar Sandoval strcmp(args[0].from, "v1") == 0) { 65670f6d82eSOmar Sandoval btrfs_clear_opt(root->fs_info->mount_opt, 65770f6d82eSOmar Sandoval FREE_SPACE_TREE); 65807802534SQu Wenruo btrfs_set_and_info(root, SPACE_CACHE, 65907802534SQu Wenruo "enabling disk space caching"); 66070f6d82eSOmar Sandoval } else if (strcmp(args[0].from, "v2") == 0) { 66170f6d82eSOmar Sandoval btrfs_clear_opt(root->fs_info->mount_opt, 66270f6d82eSOmar Sandoval SPACE_CACHE); 66370f6d82eSOmar Sandoval btrfs_set_and_info(root, FREE_SPACE_TREE, 66470f6d82eSOmar Sandoval "enabling free space tree"); 66570f6d82eSOmar Sandoval } else { 66670f6d82eSOmar Sandoval ret = -EINVAL; 66770f6d82eSOmar Sandoval goto out; 66870f6d82eSOmar Sandoval } 6690de90876SJosef Bacik break; 670f420ee1eSStefan Behrens case Opt_rescan_uuid_tree: 671f420ee1eSStefan Behrens btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); 672f420ee1eSStefan Behrens break; 67373bc1876SJosef Bacik case Opt_no_space_cache: 67470f6d82eSOmar Sandoval if (btrfs_test_opt(root, SPACE_CACHE)) { 67507802534SQu Wenruo btrfs_clear_and_info(root, SPACE_CACHE, 67607802534SQu Wenruo "disabling disk space caching"); 67770f6d82eSOmar Sandoval } 67870f6d82eSOmar Sandoval if (btrfs_test_opt(root, FREE_SPACE_TREE)) { 67970f6d82eSOmar Sandoval btrfs_clear_and_info(root, FREE_SPACE_TREE, 68070f6d82eSOmar Sandoval "disabling free space tree"); 68170f6d82eSOmar Sandoval } 68273bc1876SJosef Bacik break; 6834b9465cbSChris Mason case Opt_inode_cache: 6847e1876acSDavid Sterba btrfs_set_pending_and_info(info, INODE_MAP_CACHE, 68507802534SQu Wenruo "enabling inode map caching"); 6863818aea2SQu Wenruo break; 6873818aea2SQu Wenruo case Opt_noinode_cache: 6887e1876acSDavid Sterba btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, 68907802534SQu Wenruo "disabling inode map caching"); 6904b9465cbSChris Mason break; 69188c2ba3bSJosef Bacik case Opt_clear_cache: 69207802534SQu Wenruo btrfs_set_and_info(root, CLEAR_CACHE, 69307802534SQu Wenruo "force clearing of disk cache"); 6940af3d00bSJosef Bacik break; 6954260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 6964260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 6974260f7c7SSage Weil break; 69891435650SChris Mason case Opt_enospc_debug: 69991435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 70091435650SChris Mason break; 70153036293SQu Wenruo case Opt_noenospc_debug: 70253036293SQu Wenruo btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); 70353036293SQu Wenruo break; 7044cb5300bSChris Mason case Opt_defrag: 70507802534SQu Wenruo btrfs_set_and_info(root, AUTO_DEFRAG, 70607802534SQu Wenruo "enabling auto defrag"); 7074cb5300bSChris Mason break; 708fc0ca9afSQu Wenruo case Opt_nodefrag: 70907802534SQu Wenruo btrfs_clear_and_info(root, AUTO_DEFRAG, 71007802534SQu Wenruo "disabling auto defrag"); 711fc0ca9afSQu Wenruo break; 712af31f5e5SChris Mason case Opt_recovery: 7138dcddfa0SQu Wenruo btrfs_warn(root->fs_info, 7148dcddfa0SQu Wenruo "'recovery' is deprecated, use 'usebackuproot' instead"); 7158dcddfa0SQu Wenruo case Opt_usebackuproot: 7168dcddfa0SQu Wenruo btrfs_info(root->fs_info, 7178dcddfa0SQu Wenruo "trying to use backup root at mount time"); 7188dcddfa0SQu Wenruo btrfs_set_opt(info->mount_opt, USEBACKUPROOT); 719af31f5e5SChris Mason break; 7209555c6c1SIlya Dryomov case Opt_skip_balance: 7219555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 7229555c6c1SIlya Dryomov break; 72321adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 72421adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 725efe120a0SFrank Holton btrfs_info(root->fs_info, 726efe120a0SFrank Holton "enabling check integrity including extent data"); 72721adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 72821adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 72921adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 73021adbd5cSStefan Behrens break; 73121adbd5cSStefan Behrens case Opt_check_integrity: 732efe120a0SFrank Holton btrfs_info(root->fs_info, "enabling check integrity"); 73321adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 73421adbd5cSStefan Behrens break; 73521adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 7362c334e87SWang Shilong ret = match_int(&args[0], &intarg); 7372c334e87SWang Shilong if (ret) { 7382c334e87SWang Shilong goto out; 7392c334e87SWang Shilong } else if (intarg >= 0) { 74021adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 741efe120a0SFrank Holton btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", 74221adbd5cSStefan Behrens info->check_integrity_print_mask); 7432c334e87SWang Shilong } else { 7442c334e87SWang Shilong ret = -EINVAL; 7452c334e87SWang Shilong goto out; 74621adbd5cSStefan Behrens } 74721adbd5cSStefan Behrens break; 74821adbd5cSStefan Behrens #else 74921adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 75021adbd5cSStefan Behrens case Opt_check_integrity: 75121adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 752efe120a0SFrank Holton btrfs_err(root->fs_info, 753efe120a0SFrank Holton "support for check_integrity* not compiled in!"); 75421adbd5cSStefan Behrens ret = -EINVAL; 75521adbd5cSStefan Behrens goto out; 75621adbd5cSStefan Behrens #endif 7578c342930SJeff Mahoney case Opt_fatal_errors: 7588c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 7598c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 7608c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 7618c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 7628c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 7638c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 7648c342930SJeff Mahoney else { 7658c342930SJeff Mahoney ret = -EINVAL; 7668c342930SJeff Mahoney goto out; 7678c342930SJeff Mahoney } 7688c342930SJeff Mahoney break; 7698b87dc17SDavid Sterba case Opt_commit_interval: 7708b87dc17SDavid Sterba intarg = 0; 7718b87dc17SDavid Sterba ret = match_int(&args[0], &intarg); 7728b87dc17SDavid Sterba if (ret < 0) { 773efe120a0SFrank Holton btrfs_err(root->fs_info, "invalid commit interval"); 7748b87dc17SDavid Sterba ret = -EINVAL; 7758b87dc17SDavid Sterba goto out; 7768b87dc17SDavid Sterba } 7778b87dc17SDavid Sterba if (intarg > 0) { 7788b87dc17SDavid Sterba if (intarg > 300) { 779efe120a0SFrank Holton btrfs_warn(root->fs_info, "excessive commit interval %d", 7808b87dc17SDavid Sterba intarg); 7818b87dc17SDavid Sterba } 7828b87dc17SDavid Sterba info->commit_interval = intarg; 7838b87dc17SDavid Sterba } else { 784efe120a0SFrank Holton btrfs_info(root->fs_info, "using default commit interval %ds", 7858b87dc17SDavid Sterba BTRFS_DEFAULT_COMMIT_INTERVAL); 7868b87dc17SDavid Sterba info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; 7878b87dc17SDavid Sterba } 7888b87dc17SDavid Sterba break; 789d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 790d0bd4560SJosef Bacik case Opt_fragment_all: 791d0bd4560SJosef Bacik btrfs_info(root->fs_info, "fragmenting all space"); 792d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 793d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); 794d0bd4560SJosef Bacik break; 795d0bd4560SJosef Bacik case Opt_fragment_metadata: 796d0bd4560SJosef Bacik btrfs_info(root->fs_info, "fragmenting metadata"); 797d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, 798d0bd4560SJosef Bacik FRAGMENT_METADATA); 799d0bd4560SJosef Bacik break; 800d0bd4560SJosef Bacik case Opt_fragment_data: 801d0bd4560SJosef Bacik btrfs_info(root->fs_info, "fragmenting data"); 802d0bd4560SJosef Bacik btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); 803d0bd4560SJosef Bacik break; 804d0bd4560SJosef Bacik #endif 805a7a3f7caSSage Weil case Opt_err: 806efe120a0SFrank Holton btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); 807a7a3f7caSSage Weil ret = -EINVAL; 808a7a3f7caSSage Weil goto out; 80995e05289SChris Mason default: 810be20aa9dSChris Mason break; 81195e05289SChris Mason } 81295e05289SChris Mason } 81396da0919SQu Wenruo check: 81496da0919SQu Wenruo /* 81596da0919SQu Wenruo * Extra check for current option against current flag 81696da0919SQu Wenruo */ 81796da0919SQu Wenruo if (btrfs_test_opt(root, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { 81896da0919SQu Wenruo btrfs_err(root->fs_info, 81996da0919SQu Wenruo "nologreplay must be used with ro mount option"); 82096da0919SQu Wenruo ret = -EINVAL; 82196da0919SQu Wenruo } 822a7a3f7caSSage Weil out: 82370f6d82eSOmar Sandoval if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && 82470f6d82eSOmar Sandoval !btrfs_test_opt(root, FREE_SPACE_TREE) && 82570f6d82eSOmar Sandoval !btrfs_test_opt(root, CLEAR_CACHE)) { 82670f6d82eSOmar Sandoval btrfs_err(root->fs_info, "cannot disable free space tree"); 82770f6d82eSOmar Sandoval ret = -EINVAL; 82870f6d82eSOmar Sandoval 82970f6d82eSOmar Sandoval } 83073bc1876SJosef Bacik if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 831efe120a0SFrank Holton btrfs_info(root->fs_info, "disk space caching is enabled"); 83270f6d82eSOmar Sandoval if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE)) 83370f6d82eSOmar Sandoval btrfs_info(root->fs_info, "using free space tree"); 834da495eccSJosef Bacik kfree(orig); 835a7a3f7caSSage Weil return ret; 836edf24abeSChristoph Hellwig } 837edf24abeSChristoph Hellwig 838edf24abeSChristoph Hellwig /* 839edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 840edf24abeSChristoph Hellwig * 841edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 842edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 843edf24abeSChristoph Hellwig */ 84497288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 84573f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 8465e2a4b25SDavid Sterba struct btrfs_fs_devices **fs_devices) 847edf24abeSChristoph Hellwig { 848edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 84983c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 8501493381fSWang Shilong char *num = NULL; 851edf24abeSChristoph Hellwig int error = 0; 852edf24abeSChristoph Hellwig 853edf24abeSChristoph Hellwig if (!options) 854830c4adbSJosef Bacik return 0; 855edf24abeSChristoph Hellwig 856edf24abeSChristoph Hellwig /* 857edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 858edf24abeSChristoph Hellwig * gets called twice 859edf24abeSChristoph Hellwig */ 860edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 861edf24abeSChristoph Hellwig if (!opts) 862edf24abeSChristoph Hellwig return -ENOMEM; 8633f3d0bc0STero Roponen orig = opts; 864edf24abeSChristoph Hellwig 865edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 866edf24abeSChristoph Hellwig int token; 867edf24abeSChristoph Hellwig if (!*p) 868edf24abeSChristoph Hellwig continue; 869edf24abeSChristoph Hellwig 870edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 871edf24abeSChristoph Hellwig switch (token) { 872edf24abeSChristoph Hellwig case Opt_subvol: 873a90e8b6fSIlya Dryomov kfree(*subvol_name); 874edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 8752c334e87SWang Shilong if (!*subvol_name) { 8762c334e87SWang Shilong error = -ENOMEM; 8772c334e87SWang Shilong goto out; 8782c334e87SWang Shilong } 879edf24abeSChristoph Hellwig break; 88073f73415SJosef Bacik case Opt_subvolid: 8811493381fSWang Shilong num = match_strdup(&args[0]); 8821493381fSWang Shilong if (num) { 8831493381fSWang Shilong *subvol_objectid = memparse(num, NULL); 8841493381fSWang Shilong kfree(num); 8854849f01dSJosef Bacik /* we want the original fs_tree */ 8861493381fSWang Shilong if (!*subvol_objectid) 8874849f01dSJosef Bacik *subvol_objectid = 8884849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 8892c334e87SWang Shilong } else { 8902c334e87SWang Shilong error = -EINVAL; 8912c334e87SWang Shilong goto out; 8924849f01dSJosef Bacik } 89373f73415SJosef Bacik break; 894e15d0542SXin Zhong case Opt_subvolrootid: 8955e2a4b25SDavid Sterba printk(KERN_WARNING 896efe120a0SFrank Holton "BTRFS: 'subvolrootid' mount option is deprecated and has " 897efe120a0SFrank Holton "no effect\n"); 898e15d0542SXin Zhong break; 89943e570b0SChristoph Hellwig case Opt_device: 90083c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 90183c8c9bdSJeff Liu if (!device_name) { 90283c8c9bdSJeff Liu error = -ENOMEM; 90383c8c9bdSJeff Liu goto out; 90483c8c9bdSJeff Liu } 90583c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 90643e570b0SChristoph Hellwig flags, holder, fs_devices); 90783c8c9bdSJeff Liu kfree(device_name); 90843e570b0SChristoph Hellwig if (error) 909830c4adbSJosef Bacik goto out; 91043e570b0SChristoph Hellwig break; 911edf24abeSChristoph Hellwig default: 912edf24abeSChristoph Hellwig break; 913edf24abeSChristoph Hellwig } 914edf24abeSChristoph Hellwig } 915edf24abeSChristoph Hellwig 916edf24abeSChristoph Hellwig out: 917830c4adbSJosef Bacik kfree(orig); 918edf24abeSChristoph Hellwig return error; 91995e05289SChris Mason } 92095e05289SChris Mason 92105dbe683SOmar Sandoval static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 92273f73415SJosef Bacik u64 subvol_objectid) 92373f73415SJosef Bacik { 924815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 92505dbe683SOmar Sandoval struct btrfs_root *fs_root; 92605dbe683SOmar Sandoval struct btrfs_root_ref *root_ref; 92705dbe683SOmar Sandoval struct btrfs_inode_ref *inode_ref; 92805dbe683SOmar Sandoval struct btrfs_key key; 92905dbe683SOmar Sandoval struct btrfs_path *path = NULL; 93005dbe683SOmar Sandoval char *name = NULL, *ptr; 93105dbe683SOmar Sandoval u64 dirid; 93205dbe683SOmar Sandoval int len; 93305dbe683SOmar Sandoval int ret; 93405dbe683SOmar Sandoval 93505dbe683SOmar Sandoval path = btrfs_alloc_path(); 93605dbe683SOmar Sandoval if (!path) { 93705dbe683SOmar Sandoval ret = -ENOMEM; 93805dbe683SOmar Sandoval goto err; 93905dbe683SOmar Sandoval } 94005dbe683SOmar Sandoval path->leave_spinning = 1; 94105dbe683SOmar Sandoval 94205dbe683SOmar Sandoval name = kmalloc(PATH_MAX, GFP_NOFS); 94305dbe683SOmar Sandoval if (!name) { 94405dbe683SOmar Sandoval ret = -ENOMEM; 94505dbe683SOmar Sandoval goto err; 94605dbe683SOmar Sandoval } 94705dbe683SOmar Sandoval ptr = name + PATH_MAX - 1; 94805dbe683SOmar Sandoval ptr[0] = '\0'; 94905dbe683SOmar Sandoval 95005dbe683SOmar Sandoval /* 95105dbe683SOmar Sandoval * Walk up the subvolume trees in the tree of tree roots by root 95205dbe683SOmar Sandoval * backrefs until we hit the top-level subvolume. 95305dbe683SOmar Sandoval */ 95405dbe683SOmar Sandoval while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 95505dbe683SOmar Sandoval key.objectid = subvol_objectid; 95605dbe683SOmar Sandoval key.type = BTRFS_ROOT_BACKREF_KEY; 95705dbe683SOmar Sandoval key.offset = (u64)-1; 95805dbe683SOmar Sandoval 95905dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 96005dbe683SOmar Sandoval if (ret < 0) { 96105dbe683SOmar Sandoval goto err; 96205dbe683SOmar Sandoval } else if (ret > 0) { 96305dbe683SOmar Sandoval ret = btrfs_previous_item(root, path, subvol_objectid, 96405dbe683SOmar Sandoval BTRFS_ROOT_BACKREF_KEY); 96505dbe683SOmar Sandoval if (ret < 0) { 96605dbe683SOmar Sandoval goto err; 96705dbe683SOmar Sandoval } else if (ret > 0) { 96805dbe683SOmar Sandoval ret = -ENOENT; 96905dbe683SOmar Sandoval goto err; 97005dbe683SOmar Sandoval } 97105dbe683SOmar Sandoval } 97205dbe683SOmar Sandoval 97305dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 97405dbe683SOmar Sandoval subvol_objectid = key.offset; 97505dbe683SOmar Sandoval 97605dbe683SOmar Sandoval root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], 97705dbe683SOmar Sandoval struct btrfs_root_ref); 97805dbe683SOmar Sandoval len = btrfs_root_ref_name_len(path->nodes[0], root_ref); 97905dbe683SOmar Sandoval ptr -= len + 1; 98005dbe683SOmar Sandoval if (ptr < name) { 98105dbe683SOmar Sandoval ret = -ENAMETOOLONG; 98205dbe683SOmar Sandoval goto err; 98305dbe683SOmar Sandoval } 98405dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 98505dbe683SOmar Sandoval (unsigned long)(root_ref + 1), len); 98605dbe683SOmar Sandoval ptr[0] = '/'; 98705dbe683SOmar Sandoval dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); 98805dbe683SOmar Sandoval btrfs_release_path(path); 98905dbe683SOmar Sandoval 99005dbe683SOmar Sandoval key.objectid = subvol_objectid; 99105dbe683SOmar Sandoval key.type = BTRFS_ROOT_ITEM_KEY; 99205dbe683SOmar Sandoval key.offset = (u64)-1; 99305dbe683SOmar Sandoval fs_root = btrfs_read_fs_root_no_name(fs_info, &key); 99405dbe683SOmar Sandoval if (IS_ERR(fs_root)) { 99505dbe683SOmar Sandoval ret = PTR_ERR(fs_root); 99605dbe683SOmar Sandoval goto err; 99705dbe683SOmar Sandoval } 99805dbe683SOmar Sandoval 99905dbe683SOmar Sandoval /* 100005dbe683SOmar Sandoval * Walk up the filesystem tree by inode refs until we hit the 100105dbe683SOmar Sandoval * root directory. 100205dbe683SOmar Sandoval */ 100305dbe683SOmar Sandoval while (dirid != BTRFS_FIRST_FREE_OBJECTID) { 100405dbe683SOmar Sandoval key.objectid = dirid; 100505dbe683SOmar Sandoval key.type = BTRFS_INODE_REF_KEY; 100605dbe683SOmar Sandoval key.offset = (u64)-1; 100705dbe683SOmar Sandoval 100805dbe683SOmar Sandoval ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); 100905dbe683SOmar Sandoval if (ret < 0) { 101005dbe683SOmar Sandoval goto err; 101105dbe683SOmar Sandoval } else if (ret > 0) { 101205dbe683SOmar Sandoval ret = btrfs_previous_item(fs_root, path, dirid, 101305dbe683SOmar Sandoval BTRFS_INODE_REF_KEY); 101405dbe683SOmar Sandoval if (ret < 0) { 101505dbe683SOmar Sandoval goto err; 101605dbe683SOmar Sandoval } else if (ret > 0) { 101705dbe683SOmar Sandoval ret = -ENOENT; 101805dbe683SOmar Sandoval goto err; 101905dbe683SOmar Sandoval } 102005dbe683SOmar Sandoval } 102105dbe683SOmar Sandoval 102205dbe683SOmar Sandoval btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 102305dbe683SOmar Sandoval dirid = key.offset; 102405dbe683SOmar Sandoval 102505dbe683SOmar Sandoval inode_ref = btrfs_item_ptr(path->nodes[0], 102605dbe683SOmar Sandoval path->slots[0], 102705dbe683SOmar Sandoval struct btrfs_inode_ref); 102805dbe683SOmar Sandoval len = btrfs_inode_ref_name_len(path->nodes[0], 102905dbe683SOmar Sandoval inode_ref); 103005dbe683SOmar Sandoval ptr -= len + 1; 103105dbe683SOmar Sandoval if (ptr < name) { 103205dbe683SOmar Sandoval ret = -ENAMETOOLONG; 103305dbe683SOmar Sandoval goto err; 103405dbe683SOmar Sandoval } 103505dbe683SOmar Sandoval read_extent_buffer(path->nodes[0], ptr + 1, 103605dbe683SOmar Sandoval (unsigned long)(inode_ref + 1), len); 103705dbe683SOmar Sandoval ptr[0] = '/'; 103805dbe683SOmar Sandoval btrfs_release_path(path); 103905dbe683SOmar Sandoval } 104005dbe683SOmar Sandoval } 104105dbe683SOmar Sandoval 104205dbe683SOmar Sandoval btrfs_free_path(path); 104305dbe683SOmar Sandoval if (ptr == name + PATH_MAX - 1) { 104405dbe683SOmar Sandoval name[0] = '/'; 104505dbe683SOmar Sandoval name[1] = '\0'; 104605dbe683SOmar Sandoval } else { 104705dbe683SOmar Sandoval memmove(name, ptr, name + PATH_MAX - ptr); 104805dbe683SOmar Sandoval } 104905dbe683SOmar Sandoval return name; 105005dbe683SOmar Sandoval 105105dbe683SOmar Sandoval err: 105205dbe683SOmar Sandoval btrfs_free_path(path); 105305dbe683SOmar Sandoval kfree(name); 105405dbe683SOmar Sandoval return ERR_PTR(ret); 105505dbe683SOmar Sandoval } 105605dbe683SOmar Sandoval 105705dbe683SOmar Sandoval static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) 105805dbe683SOmar Sandoval { 105905dbe683SOmar Sandoval struct btrfs_root *root = fs_info->tree_root; 106073f73415SJosef Bacik struct btrfs_dir_item *di; 106173f73415SJosef Bacik struct btrfs_path *path; 106273f73415SJosef Bacik struct btrfs_key location; 106373f73415SJosef Bacik u64 dir_id; 106473f73415SJosef Bacik 106573f73415SJosef Bacik path = btrfs_alloc_path(); 106673f73415SJosef Bacik if (!path) 106705dbe683SOmar Sandoval return -ENOMEM; 106873f73415SJosef Bacik path->leave_spinning = 1; 106973f73415SJosef Bacik 107073f73415SJosef Bacik /* 107173f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 107273f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 107373f73415SJosef Bacik * to mount. 107473f73415SJosef Bacik */ 1075815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 107673f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 1077b0839166SJulia Lawall if (IS_ERR(di)) { 1078b0839166SJulia Lawall btrfs_free_path(path); 107905dbe683SOmar Sandoval return PTR_ERR(di); 1080b0839166SJulia Lawall } 108173f73415SJosef Bacik if (!di) { 108273f73415SJosef Bacik /* 108373f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 108473f73415SJosef Bacik * it's always been there, but don't freak out, just try and 108505dbe683SOmar Sandoval * mount the top-level subvolume. 108673f73415SJosef Bacik */ 108773f73415SJosef Bacik btrfs_free_path(path); 108805dbe683SOmar Sandoval *objectid = BTRFS_FS_TREE_OBJECTID; 108905dbe683SOmar Sandoval return 0; 109073f73415SJosef Bacik } 109173f73415SJosef Bacik 109273f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 109373f73415SJosef Bacik btrfs_free_path(path); 109405dbe683SOmar Sandoval *objectid = location.objectid; 109505dbe683SOmar Sandoval return 0; 109673f73415SJosef Bacik } 109773f73415SJosef Bacik 10988a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 10998a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 11008a4b83ccSChris Mason void *data, int silent) 11012e635a27SChris Mason { 11022e635a27SChris Mason struct inode *inode; 1103815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 11045d4f98a2SYan Zheng struct btrfs_key key; 110539279cc3SChris Mason int err; 11062e635a27SChris Mason 11072e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 11082e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 1109e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 1110af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 1111be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 11125103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 11132e635a27SChris Mason sb->s_time_gran = 1; 11140eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 111533268eafSJosef Bacik sb->s_flags |= MS_POSIXACL; 111649cf6f45SChris Ball #endif 11170c4d2d95SJosef Bacik sb->s_flags |= MS_I_VERSION; 1118da2f0f74SChris Mason sb->s_iflags |= SB_I_CGROUPWB; 1119ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 1120ad2b2c80SAl Viro if (err) { 1121efe120a0SFrank Holton printk(KERN_ERR "BTRFS: open_ctree failed\n"); 1122ad2b2c80SAl Viro return err; 1123e20d96d6SChris Mason } 1124b888db2bSChris Mason 11255d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 11265d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 11275d4f98a2SYan Zheng key.offset = 0; 112898c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 11295d4f98a2SYan Zheng if (IS_ERR(inode)) { 11305d4f98a2SYan Zheng err = PTR_ERR(inode); 113139279cc3SChris Mason goto fail_close; 113239279cc3SChris Mason } 11332e635a27SChris Mason 113448fde701SAl Viro sb->s_root = d_make_root(inode); 113548fde701SAl Viro if (!sb->s_root) { 113639279cc3SChris Mason err = -ENOMEM; 113739279cc3SChris Mason goto fail_close; 11382e635a27SChris Mason } 113958176a96SJosef Bacik 11406885f308SChris Mason save_mount_options(sb, data); 114190a887c9SDan Magenheimer cleancache_init_fs(sb); 114259553edfSAl Viro sb->s_flags |= MS_ACTIVE; 11432e635a27SChris Mason return 0; 11442e635a27SChris Mason 114539279cc3SChris Mason fail_close: 1146815745cfSAl Viro close_ctree(fs_info->tree_root); 1147d5719762SChris Mason return err; 1148d5719762SChris Mason } 1149d5719762SChris Mason 11506bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 1151d5719762SChris Mason { 1152d5719762SChris Mason struct btrfs_trans_handle *trans; 1153815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1154815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 1155df2ce34cSChris Mason 11561abe9b8aSliubo trace_btrfs_sync_fs(wait); 11571abe9b8aSliubo 1158d561c025SChris Mason if (!wait) { 1159815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 1160df2ce34cSChris Mason return 0; 1161d561c025SChris Mason } 1162771ed689SChris Mason 1163b0244199SMiao Xie btrfs_wait_ordered_roots(fs_info, -1); 1164771ed689SChris Mason 1165d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 116660376ce4SJosef Bacik if (IS_ERR(trans)) { 1167354aa0fbSMiao Xie /* no transaction, don't bother */ 11686b5fe46dSDavid Sterba if (PTR_ERR(trans) == -ENOENT) { 11696b5fe46dSDavid Sterba /* 11706b5fe46dSDavid Sterba * Exit unless we have some pending changes 11716b5fe46dSDavid Sterba * that need to go through commit 11726b5fe46dSDavid Sterba */ 11736b5fe46dSDavid Sterba if (fs_info->pending_changes == 0) 1174bd7de2c9SJosef Bacik return 0; 1175a53f4f8eSQu Wenruo /* 1176a53f4f8eSQu Wenruo * A non-blocking test if the fs is frozen. We must not 1177a53f4f8eSQu Wenruo * start a new transaction here otherwise a deadlock 1178a53f4f8eSQu Wenruo * happens. The pending operations are delayed to the 1179a53f4f8eSQu Wenruo * next commit after thawing. 1180a53f4f8eSQu Wenruo */ 1181a53f4f8eSQu Wenruo if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) 1182a53f4f8eSQu Wenruo __sb_end_write(sb, SB_FREEZE_WRITE); 1183a53f4f8eSQu Wenruo else 1184a53f4f8eSQu Wenruo return 0; 11856b5fe46dSDavid Sterba trans = btrfs_start_transaction(root, 0); 118660376ce4SJosef Bacik } 118798bd5c54SDavid Sterba if (IS_ERR(trans)) 118898bd5c54SDavid Sterba return PTR_ERR(trans); 11896b5fe46dSDavid Sterba } 1190bd7de2c9SJosef Bacik return btrfs_commit_transaction(trans, root); 1191d5719762SChris Mason } 1192d5719762SChris Mason 119334c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 1194a9572a15SEric Paris { 1195815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 1196815745cfSAl Viro struct btrfs_root *root = info->tree_root; 1197200da64eSTsutomu Itoh char *compress_type; 1198a9572a15SEric Paris 1199a9572a15SEric Paris if (btrfs_test_opt(root, DEGRADED)) 1200a9572a15SEric Paris seq_puts(seq, ",degraded"); 1201a9572a15SEric Paris if (btrfs_test_opt(root, NODATASUM)) 1202a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 1203a9572a15SEric Paris if (btrfs_test_opt(root, NODATACOW)) 1204a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 1205a9572a15SEric Paris if (btrfs_test_opt(root, NOBARRIER)) 1206a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 120795ac567aSFilipe David Borba Manana if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) 1208c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",max_inline=%llu", info->max_inline); 1209a9572a15SEric Paris if (info->alloc_start != 0) 1210c1c9ff7cSGeert Uytterhoeven seq_printf(seq, ",alloc_start=%llu", info->alloc_start); 1211a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 1212a9572a15SEric Paris num_online_cpus() + 2, 8)) 1213a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 1214200da64eSTsutomu Itoh if (btrfs_test_opt(root, COMPRESS)) { 1215200da64eSTsutomu Itoh if (info->compress_type == BTRFS_COMPRESS_ZLIB) 1216200da64eSTsutomu Itoh compress_type = "zlib"; 1217200da64eSTsutomu Itoh else 1218200da64eSTsutomu Itoh compress_type = "lzo"; 1219200da64eSTsutomu Itoh if (btrfs_test_opt(root, FORCE_COMPRESS)) 1220200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 1221200da64eSTsutomu Itoh else 1222200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 1223200da64eSTsutomu Itoh } 1224c289811cSChris Mason if (btrfs_test_opt(root, NOSSD)) 1225c289811cSChris Mason seq_puts(seq, ",nossd"); 1226451d7585SChris Mason if (btrfs_test_opt(root, SSD_SPREAD)) 1227451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 1228451d7585SChris Mason else if (btrfs_test_opt(root, SSD)) 1229a9572a15SEric Paris seq_puts(seq, ",ssd"); 12303a5e1404SSage Weil if (btrfs_test_opt(root, NOTREELOG)) 12316b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 123296da0919SQu Wenruo if (btrfs_test_opt(root, NOLOGREPLAY)) 123396da0919SQu Wenruo seq_puts(seq, ",nologreplay"); 1234dccae999SSage Weil if (btrfs_test_opt(root, FLUSHONCOMMIT)) 12356b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 123620a5239aSMatthew Wilcox if (btrfs_test_opt(root, DISCARD)) 123720a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 1238a9572a15SEric Paris if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 1239a9572a15SEric Paris seq_puts(seq, ",noacl"); 1240200da64eSTsutomu Itoh if (btrfs_test_opt(root, SPACE_CACHE)) 1241200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 124270f6d82eSOmar Sandoval else if (btrfs_test_opt(root, FREE_SPACE_TREE)) 124370f6d82eSOmar Sandoval seq_puts(seq, ",space_cache=v2"); 124473bc1876SJosef Bacik else 12458965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 1246f420ee1eSStefan Behrens if (btrfs_test_opt(root, RESCAN_UUID_TREE)) 1247f420ee1eSStefan Behrens seq_puts(seq, ",rescan_uuid_tree"); 1248200da64eSTsutomu Itoh if (btrfs_test_opt(root, CLEAR_CACHE)) 1249200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 1250200da64eSTsutomu Itoh if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 1251200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 12520942caa3SDavid Sterba if (btrfs_test_opt(root, ENOSPC_DEBUG)) 12530942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 12540942caa3SDavid Sterba if (btrfs_test_opt(root, AUTO_DEFRAG)) 12550942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 12560942caa3SDavid Sterba if (btrfs_test_opt(root, INODE_MAP_CACHE)) 12570942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 12589555c6c1SIlya Dryomov if (btrfs_test_opt(root, SKIP_BALANCE)) 12599555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 12608507d216SWang Shilong #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 12618507d216SWang Shilong if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) 12628507d216SWang Shilong seq_puts(seq, ",check_int_data"); 12638507d216SWang Shilong else if (btrfs_test_opt(root, CHECK_INTEGRITY)) 12648507d216SWang Shilong seq_puts(seq, ",check_int"); 12658507d216SWang Shilong if (info->check_integrity_print_mask) 12668507d216SWang Shilong seq_printf(seq, ",check_int_print_mask=%d", 12678507d216SWang Shilong info->check_integrity_print_mask); 12688507d216SWang Shilong #endif 12698507d216SWang Shilong if (info->metadata_ratio) 12708507d216SWang Shilong seq_printf(seq, ",metadata_ratio=%d", 12718507d216SWang Shilong info->metadata_ratio); 12728c342930SJeff Mahoney if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 12738c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 12748b87dc17SDavid Sterba if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) 12758b87dc17SDavid Sterba seq_printf(seq, ",commit=%d", info->commit_interval); 1276d0bd4560SJosef Bacik #ifdef CONFIG_BTRFS_DEBUG 1277d0bd4560SJosef Bacik if (btrfs_test_opt(root, FRAGMENT_DATA)) 1278d0bd4560SJosef Bacik seq_puts(seq, ",fragment=data"); 1279d0bd4560SJosef Bacik if (btrfs_test_opt(root, FRAGMENT_METADATA)) 1280d0bd4560SJosef Bacik seq_puts(seq, ",fragment=metadata"); 1281d0bd4560SJosef Bacik #endif 1282c8d3fe02SOmar Sandoval seq_printf(seq, ",subvolid=%llu", 1283c8d3fe02SOmar Sandoval BTRFS_I(d_inode(dentry))->root->root_key.objectid); 1284c8d3fe02SOmar Sandoval seq_puts(seq, ",subvol="); 1285c8d3fe02SOmar Sandoval seq_dentry(seq, dentry, " \t\n\\"); 1286a9572a15SEric Paris return 0; 1287a9572a15SEric Paris } 1288a9572a15SEric Paris 1289a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 12902e635a27SChris Mason { 1291815745cfSAl Viro struct btrfs_fs_info *p = data; 1292815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 12934b82d6e4SYan 1294815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 12954b82d6e4SYan } 12964b82d6e4SYan 1297450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 1298450ba0eaSJosef Bacik { 12996de1d09dSAl Viro int err = set_anon_super(s, data); 13006de1d09dSAl Viro if (!err) 1301450ba0eaSJosef Bacik s->s_fs_info = data; 13026de1d09dSAl Viro return err; 1303450ba0eaSJosef Bacik } 1304450ba0eaSJosef Bacik 1305830c4adbSJosef Bacik /* 1306f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 1307f9d9ef62SDavid Sterba */ 1308f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 1309f9d9ef62SDavid Sterba { 1310f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 1311f9d9ef62SDavid Sterba return 1; 1312f9d9ef62SDavid Sterba return 0; 1313f9d9ef62SDavid Sterba } 1314f9d9ef62SDavid Sterba 1315f9d9ef62SDavid Sterba /* 1316e6e4dbe8SOmar Sandoval * This will add subvolid=0 to the argument string while removing any subvol= 1317e6e4dbe8SOmar Sandoval * and subvolid= arguments to make sure we get the top-level root for path 1318e6e4dbe8SOmar Sandoval * walking to the subvol we want. 1319830c4adbSJosef Bacik */ 1320830c4adbSJosef Bacik static char *setup_root_args(char *args) 1321830c4adbSJosef Bacik { 1322e6e4dbe8SOmar Sandoval char *buf, *dst, *sep; 1323830c4adbSJosef Bacik 1324e6e4dbe8SOmar Sandoval if (!args) 1325e6e4dbe8SOmar Sandoval return kstrdup("subvolid=0", GFP_NOFS); 1326830c4adbSJosef Bacik 1327e6e4dbe8SOmar Sandoval /* The worst case is that we add ",subvolid=0" to the end. */ 1328e6e4dbe8SOmar Sandoval buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); 1329f60d16a8SJim Meyering if (!buf) 1330f60d16a8SJim Meyering return NULL; 1331830c4adbSJosef Bacik 1332e6e4dbe8SOmar Sandoval while (1) { 1333e6e4dbe8SOmar Sandoval sep = strchrnul(args, ','); 1334e6e4dbe8SOmar Sandoval if (!strstarts(args, "subvol=") && 1335e6e4dbe8SOmar Sandoval !strstarts(args, "subvolid=")) { 1336e6e4dbe8SOmar Sandoval memcpy(dst, args, sep - args); 1337e6e4dbe8SOmar Sandoval dst += sep - args; 1338e6e4dbe8SOmar Sandoval *dst++ = ','; 1339830c4adbSJosef Bacik } 1340e6e4dbe8SOmar Sandoval if (*sep) 1341e6e4dbe8SOmar Sandoval args = sep + 1; 1342e6e4dbe8SOmar Sandoval else 1343e6e4dbe8SOmar Sandoval break; 1344e6e4dbe8SOmar Sandoval } 1345f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 1346830c4adbSJosef Bacik 1347f60d16a8SJim Meyering return buf; 1348830c4adbSJosef Bacik } 1349830c4adbSJosef Bacik 1350bb289b7bSOmar Sandoval static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, 1351bb289b7bSOmar Sandoval int flags, const char *device_name, 1352bb289b7bSOmar Sandoval char *data) 1353830c4adbSJosef Bacik { 1354830c4adbSJosef Bacik struct dentry *root; 1355fa330659SOmar Sandoval struct vfsmount *mnt = NULL; 1356830c4adbSJosef Bacik char *newargs; 1357fa330659SOmar Sandoval int ret; 1358830c4adbSJosef Bacik 1359830c4adbSJosef Bacik newargs = setup_root_args(data); 1360fa330659SOmar Sandoval if (!newargs) { 1361fa330659SOmar Sandoval root = ERR_PTR(-ENOMEM); 1362fa330659SOmar Sandoval goto out; 1363fa330659SOmar Sandoval } 13640723a047SHarald Hoyer 1365fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); 1366fa330659SOmar Sandoval if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { 13670723a047SHarald Hoyer if (flags & MS_RDONLY) { 1368fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, 1369fa330659SOmar Sandoval device_name, newargs); 13700723a047SHarald Hoyer } else { 1371fa330659SOmar Sandoval mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, 1372fa330659SOmar Sandoval device_name, newargs); 13730040e606SChristoph Jaeger if (IS_ERR(mnt)) { 1374fa330659SOmar Sandoval root = ERR_CAST(mnt); 1375fa330659SOmar Sandoval mnt = NULL; 1376fa330659SOmar Sandoval goto out; 13770040e606SChristoph Jaeger } 13780723a047SHarald Hoyer 1379773cd04eSOmar Sandoval down_write(&mnt->mnt_sb->s_umount); 1380fa330659SOmar Sandoval ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); 1381773cd04eSOmar Sandoval up_write(&mnt->mnt_sb->s_umount); 1382fa330659SOmar Sandoval if (ret < 0) { 1383fa330659SOmar Sandoval root = ERR_PTR(ret); 1384fa330659SOmar Sandoval goto out; 13850723a047SHarald Hoyer } 13860723a047SHarald Hoyer } 13870723a047SHarald Hoyer } 1388fa330659SOmar Sandoval if (IS_ERR(mnt)) { 1389fa330659SOmar Sandoval root = ERR_CAST(mnt); 1390fa330659SOmar Sandoval mnt = NULL; 1391fa330659SOmar Sandoval goto out; 1392fa330659SOmar Sandoval } 1393830c4adbSJosef Bacik 139405dbe683SOmar Sandoval if (!subvol_name) { 139505dbe683SOmar Sandoval if (!subvol_objectid) { 139605dbe683SOmar Sandoval ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), 139705dbe683SOmar Sandoval &subvol_objectid); 139805dbe683SOmar Sandoval if (ret) { 139905dbe683SOmar Sandoval root = ERR_PTR(ret); 140005dbe683SOmar Sandoval goto out; 140105dbe683SOmar Sandoval } 140205dbe683SOmar Sandoval } 140305dbe683SOmar Sandoval subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), 140405dbe683SOmar Sandoval subvol_objectid); 140505dbe683SOmar Sandoval if (IS_ERR(subvol_name)) { 140605dbe683SOmar Sandoval root = ERR_CAST(subvol_name); 140705dbe683SOmar Sandoval subvol_name = NULL; 140805dbe683SOmar Sandoval goto out; 140905dbe683SOmar Sandoval } 141005dbe683SOmar Sandoval 141105dbe683SOmar Sandoval } 141205dbe683SOmar Sandoval 1413ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1414fa330659SOmar Sandoval /* mount_subtree() drops our reference on the vfsmount. */ 1415fa330659SOmar Sandoval mnt = NULL; 1416830c4adbSJosef Bacik 1417bb289b7bSOmar Sandoval if (!IS_ERR(root)) { 1418ea441d11SAl Viro struct super_block *s = root->d_sb; 1419bb289b7bSOmar Sandoval struct inode *root_inode = d_inode(root); 1420bb289b7bSOmar Sandoval u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; 1421bb289b7bSOmar Sandoval 1422bb289b7bSOmar Sandoval ret = 0; 1423bb289b7bSOmar Sandoval if (!is_subvolume_inode(root_inode)) { 1424bb289b7bSOmar Sandoval pr_err("BTRFS: '%s' is not a valid subvolume\n", 1425bb289b7bSOmar Sandoval subvol_name); 1426bb289b7bSOmar Sandoval ret = -EINVAL; 1427bb289b7bSOmar Sandoval } 1428bb289b7bSOmar Sandoval if (subvol_objectid && root_objectid != subvol_objectid) { 142905dbe683SOmar Sandoval /* 143005dbe683SOmar Sandoval * This will also catch a race condition where a 143105dbe683SOmar Sandoval * subvolume which was passed by ID is renamed and 143205dbe683SOmar Sandoval * another subvolume is renamed over the old location. 143305dbe683SOmar Sandoval */ 1434bb289b7bSOmar Sandoval pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", 1435bb289b7bSOmar Sandoval subvol_name, subvol_objectid); 1436bb289b7bSOmar Sandoval ret = -EINVAL; 1437bb289b7bSOmar Sandoval } 1438bb289b7bSOmar Sandoval if (ret) { 1439ea441d11SAl Viro dput(root); 1440bb289b7bSOmar Sandoval root = ERR_PTR(ret); 1441ea441d11SAl Viro deactivate_locked_super(s); 1442bb289b7bSOmar Sandoval } 1443f9d9ef62SDavid Sterba } 1444f9d9ef62SDavid Sterba 1445fa330659SOmar Sandoval out: 1446fa330659SOmar Sandoval mntput(mnt); 1447fa330659SOmar Sandoval kfree(newargs); 1448fa330659SOmar Sandoval kfree(subvol_name); 1449830c4adbSJosef Bacik return root; 1450830c4adbSJosef Bacik } 1451450ba0eaSJosef Bacik 1452f667aef6SQu Wenruo static int parse_security_options(char *orig_opts, 1453f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1454f667aef6SQu Wenruo { 1455f667aef6SQu Wenruo char *secdata = NULL; 1456f667aef6SQu Wenruo int ret = 0; 1457f667aef6SQu Wenruo 1458f667aef6SQu Wenruo secdata = alloc_secdata(); 1459f667aef6SQu Wenruo if (!secdata) 1460f667aef6SQu Wenruo return -ENOMEM; 1461f667aef6SQu Wenruo ret = security_sb_copy_data(orig_opts, secdata); 1462f667aef6SQu Wenruo if (ret) { 1463f667aef6SQu Wenruo free_secdata(secdata); 1464f667aef6SQu Wenruo return ret; 1465f667aef6SQu Wenruo } 1466f667aef6SQu Wenruo ret = security_sb_parse_opts_str(secdata, sec_opts); 1467f667aef6SQu Wenruo free_secdata(secdata); 1468f667aef6SQu Wenruo return ret; 1469f667aef6SQu Wenruo } 1470f667aef6SQu Wenruo 1471f667aef6SQu Wenruo static int setup_security_options(struct btrfs_fs_info *fs_info, 1472f667aef6SQu Wenruo struct super_block *sb, 1473f667aef6SQu Wenruo struct security_mnt_opts *sec_opts) 1474f667aef6SQu Wenruo { 1475f667aef6SQu Wenruo int ret = 0; 1476f667aef6SQu Wenruo 1477f667aef6SQu Wenruo /* 1478f667aef6SQu Wenruo * Call security_sb_set_mnt_opts() to check whether new sec_opts 1479f667aef6SQu Wenruo * is valid. 1480f667aef6SQu Wenruo */ 1481f667aef6SQu Wenruo ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); 1482f667aef6SQu Wenruo if (ret) 1483f667aef6SQu Wenruo return ret; 1484f667aef6SQu Wenruo 1485a43bb39bSQu Wenruo #ifdef CONFIG_SECURITY 1486f667aef6SQu Wenruo if (!fs_info->security_opts.num_mnt_opts) { 1487f667aef6SQu Wenruo /* first time security setup, copy sec_opts to fs_info */ 1488f667aef6SQu Wenruo memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); 1489f667aef6SQu Wenruo } else { 1490f667aef6SQu Wenruo /* 1491f667aef6SQu Wenruo * Since SELinux(the only one supports security_mnt_opts) does 1492f667aef6SQu Wenruo * NOT support changing context during remount/mount same sb, 1493f667aef6SQu Wenruo * This must be the same or part of the same security options, 1494f667aef6SQu Wenruo * just free it. 1495f667aef6SQu Wenruo */ 1496f667aef6SQu Wenruo security_free_mnt_opts(sec_opts); 1497f667aef6SQu Wenruo } 1498a43bb39bSQu Wenruo #endif 1499f667aef6SQu Wenruo return ret; 1500f667aef6SQu Wenruo } 1501f667aef6SQu Wenruo 1502edf24abeSChristoph Hellwig /* 1503edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1504edf24abeSChristoph Hellwig * 1505edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1506edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1507edf24abeSChristoph Hellwig */ 1508061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1509306e16ceSDavid Sterba const char *device_name, void *data) 15104b82d6e4SYan { 15114b82d6e4SYan struct block_device *bdev = NULL; 15124b82d6e4SYan struct super_block *s; 15138a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1514450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 1515f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 151697288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 151773f73415SJosef Bacik char *subvol_name = NULL; 151873f73415SJosef Bacik u64 subvol_objectid = 0; 15194b82d6e4SYan int error = 0; 15204b82d6e4SYan 152197288f2cSChristoph Hellwig if (!(flags & MS_RDONLY)) 152297288f2cSChristoph Hellwig mode |= FMODE_WRITE; 152397288f2cSChristoph Hellwig 152497288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 152573f73415SJosef Bacik &subvol_name, &subvol_objectid, 15265e2a4b25SDavid Sterba &fs_devices); 1527f23c8af8SIlya Dryomov if (error) { 1528f23c8af8SIlya Dryomov kfree(subvol_name); 1529061dbc6bSAl Viro return ERR_PTR(error); 1530f23c8af8SIlya Dryomov } 1531edf24abeSChristoph Hellwig 153205dbe683SOmar Sandoval if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { 1533fa330659SOmar Sandoval /* mount_subvol() will free subvol_name. */ 1534bb289b7bSOmar Sandoval return mount_subvol(subvol_name, subvol_objectid, flags, 1535bb289b7bSOmar Sandoval device_name, data); 1536830c4adbSJosef Bacik } 1537830c4adbSJosef Bacik 1538f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1539f667aef6SQu Wenruo if (data) { 1540f667aef6SQu Wenruo error = parse_security_options(data, &new_sec_opts); 15418a4b83ccSChris Mason if (error) 1542830c4adbSJosef Bacik return ERR_PTR(error); 1543f667aef6SQu Wenruo } 1544f667aef6SQu Wenruo 1545f667aef6SQu Wenruo error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 1546f667aef6SQu Wenruo if (error) 1547f667aef6SQu Wenruo goto error_sec_opts; 15484b82d6e4SYan 1549450ba0eaSJosef Bacik /* 1550450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1551450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1552450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1553450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1554450ba0eaSJosef Bacik */ 1555450ba0eaSJosef Bacik fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 1556f667aef6SQu Wenruo if (!fs_info) { 1557f667aef6SQu Wenruo error = -ENOMEM; 1558f667aef6SQu Wenruo goto error_sec_opts; 1559f667aef6SQu Wenruo } 156004d21a24SIlya Dryomov 1561450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1562450ba0eaSJosef Bacik 15636c41761fSDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 15646c41761fSDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 1565f667aef6SQu Wenruo security_init_mnt_opts(&fs_info->security_opts); 15666c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 15676c41761fSDavid Sterba error = -ENOMEM; 156804d21a24SIlya Dryomov goto error_fs_info; 156904d21a24SIlya Dryomov } 157004d21a24SIlya Dryomov 157104d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 157204d21a24SIlya Dryomov if (error) 157304d21a24SIlya Dryomov goto error_fs_info; 157404d21a24SIlya Dryomov 157504d21a24SIlya Dryomov if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 157604d21a24SIlya Dryomov error = -EACCES; 15776c41761fSDavid Sterba goto error_close_devices; 15786c41761fSDavid Sterba } 15796c41761fSDavid Sterba 1580dfe25020SChris Mason bdev = fs_devices->latest_bdev; 15819249e17fSDavid Howells s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 15829249e17fSDavid Howells fs_info); 1583830c4adbSJosef Bacik if (IS_ERR(s)) { 1584830c4adbSJosef Bacik error = PTR_ERR(s); 1585830c4adbSJosef Bacik goto error_close_devices; 1586830c4adbSJosef Bacik } 15874b82d6e4SYan 15884b82d6e4SYan if (s->s_root) { 15892b82032cSYan Zheng btrfs_close_devices(fs_devices); 15906c41761fSDavid Sterba free_fs_info(fs_info); 159159553edfSAl Viro if ((flags ^ s->s_flags) & MS_RDONLY) 159259553edfSAl Viro error = -EBUSY; 15934b82d6e4SYan } else { 1594a1c6f057SDmitry Monakhov snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1595815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 15968a4b83ccSChris Mason error = btrfs_fill_super(s, fs_devices, data, 15978a4b83ccSChris Mason flags & MS_SILENT ? 1 : 0); 15984b82d6e4SYan } 159905dbe683SOmar Sandoval if (error) { 1600e15d0542SXin Zhong deactivate_locked_super(s); 1601f667aef6SQu Wenruo goto error_sec_opts; 1602f667aef6SQu Wenruo } 1603f667aef6SQu Wenruo 1604f667aef6SQu Wenruo fs_info = btrfs_sb(s); 1605f667aef6SQu Wenruo error = setup_security_options(fs_info, s, &new_sec_opts); 1606f667aef6SQu Wenruo if (error) { 1607f667aef6SQu Wenruo deactivate_locked_super(s); 1608f667aef6SQu Wenruo goto error_sec_opts; 1609f667aef6SQu Wenruo } 16104b82d6e4SYan 161105dbe683SOmar Sandoval return dget(s->s_root); 16124b82d6e4SYan 1613c146afadSYan Zheng error_close_devices: 16148a4b83ccSChris Mason btrfs_close_devices(fs_devices); 161504d21a24SIlya Dryomov error_fs_info: 16166c41761fSDavid Sterba free_fs_info(fs_info); 1617f667aef6SQu Wenruo error_sec_opts: 1618f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1619061dbc6bSAl Viro return ERR_PTR(error); 16204b82d6e4SYan } 16212e635a27SChris Mason 16220d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 16230d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 16240d2450abSSergei Trofimovich { 16250d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 16260d2450abSSergei Trofimovich return; 16270d2450abSSergei Trofimovich 16280d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 16290d2450abSSergei Trofimovich 1630efe120a0SFrank Holton btrfs_info(fs_info, "resize thread pool %d -> %d", 16310d2450abSSergei Trofimovich old_pool_size, new_pool_size); 16320d2450abSSergei Trofimovich 16335cdc7ad3SQu Wenruo btrfs_workqueue_set_max(fs_info->workers, new_pool_size); 1634afe3d242SQu Wenruo btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); 1635a8c93d4eSQu Wenruo btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); 1636e66f0bb1SQu Wenruo btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); 1637fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); 1638fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); 1639fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, 1640fccb5d86SQu Wenruo new_pool_size); 1641fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); 1642fccb5d86SQu Wenruo btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); 16435b3bc44eSQu Wenruo btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); 1644736cfa15SQu Wenruo btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); 16450339ef2fSQu Wenruo btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, 1646ff023aacSStefan Behrens new_pool_size); 16470d2450abSSergei Trofimovich } 16480d2450abSSergei Trofimovich 1649f42a34b2SMiao Xie static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) 1650dc81cdc5SMiao Xie { 1651dc81cdc5SMiao Xie set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1652f42a34b2SMiao Xie } 1653dc81cdc5SMiao Xie 1654f42a34b2SMiao Xie static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, 1655f42a34b2SMiao Xie unsigned long old_opts, int flags) 1656f42a34b2SMiao Xie { 1657dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1658dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1659dc81cdc5SMiao Xie (flags & MS_RDONLY))) { 1660dc81cdc5SMiao Xie /* wait for any defraggers to finish */ 1661dc81cdc5SMiao Xie wait_event(fs_info->transaction_wait, 1662dc81cdc5SMiao Xie (atomic_read(&fs_info->defrag_running) == 0)); 1663dc81cdc5SMiao Xie if (flags & MS_RDONLY) 1664dc81cdc5SMiao Xie sync_filesystem(fs_info->sb); 1665dc81cdc5SMiao Xie } 1666dc81cdc5SMiao Xie } 1667dc81cdc5SMiao Xie 1668dc81cdc5SMiao Xie static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, 1669dc81cdc5SMiao Xie unsigned long old_opts) 1670dc81cdc5SMiao Xie { 1671dc81cdc5SMiao Xie /* 1672dc81cdc5SMiao Xie * We need cleanup all defragable inodes if the autodefragment is 1673dc81cdc5SMiao Xie * close or the fs is R/O. 1674dc81cdc5SMiao Xie */ 1675dc81cdc5SMiao Xie if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && 1676dc81cdc5SMiao Xie (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || 1677dc81cdc5SMiao Xie (fs_info->sb->s_flags & MS_RDONLY))) { 1678dc81cdc5SMiao Xie btrfs_cleanup_defrag_inodes(fs_info); 1679dc81cdc5SMiao Xie } 1680dc81cdc5SMiao Xie 1681dc81cdc5SMiao Xie clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); 1682dc81cdc5SMiao Xie } 1683dc81cdc5SMiao Xie 1684c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1685c146afadSYan Zheng { 1686815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1687815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 168849b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 168949b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 169049b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 169149b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 169249b25e05SJeff Mahoney u64 old_alloc_start = fs_info->alloc_start; 169349b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 169449b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1695c146afadSYan Zheng int ret; 1696c146afadSYan Zheng 169702b9984dSTheodore Ts'o sync_filesystem(sb); 1698f42a34b2SMiao Xie btrfs_remount_prepare(fs_info); 1699dc81cdc5SMiao Xie 1700f667aef6SQu Wenruo if (data) { 1701f667aef6SQu Wenruo struct security_mnt_opts new_sec_opts; 1702f667aef6SQu Wenruo 1703f667aef6SQu Wenruo security_init_mnt_opts(&new_sec_opts); 1704f667aef6SQu Wenruo ret = parse_security_options(data, &new_sec_opts); 1705f667aef6SQu Wenruo if (ret) 1706f667aef6SQu Wenruo goto restore; 1707f667aef6SQu Wenruo ret = setup_security_options(fs_info, sb, 1708f667aef6SQu Wenruo &new_sec_opts); 1709f667aef6SQu Wenruo if (ret) { 1710f667aef6SQu Wenruo security_free_mnt_opts(&new_sec_opts); 1711f667aef6SQu Wenruo goto restore; 1712f667aef6SQu Wenruo } 1713f667aef6SQu Wenruo } 1714f667aef6SQu Wenruo 171596da0919SQu Wenruo ret = btrfs_parse_options(root, data, *flags); 171649b25e05SJeff Mahoney if (ret) { 171749b25e05SJeff Mahoney ret = -EINVAL; 171849b25e05SJeff Mahoney goto restore; 171949b25e05SJeff Mahoney } 1720b288052eSChris Mason 1721f42a34b2SMiao Xie btrfs_remount_begin(fs_info, old_opts, *flags); 17220d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 17230d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 17240d2450abSSergei Trofimovich 1725c146afadSYan Zheng if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1726dc81cdc5SMiao Xie goto out; 1727c146afadSYan Zheng 1728c146afadSYan Zheng if (*flags & MS_RDONLY) { 17298dabb742SStefan Behrens /* 17308dabb742SStefan Behrens * this also happens on 'umount -rf' or on shutdown, when 17318dabb742SStefan Behrens * the filesystem is busy. 17328dabb742SStefan Behrens */ 173321c7e756SMiao Xie cancel_work_sync(&fs_info->async_reclaim_work); 1734361c093dSStefan Behrens 1735361c093dSStefan Behrens /* wait for the uuid_scan task to finish */ 1736361c093dSStefan Behrens down(&fs_info->uuid_tree_rescan_sem); 1737361c093dSStefan Behrens /* avoid complains from lockdep et al. */ 1738361c093dSStefan Behrens up(&fs_info->uuid_tree_rescan_sem); 1739361c093dSStefan Behrens 1740c146afadSYan Zheng sb->s_flags |= MS_RDONLY; 1741c146afadSYan Zheng 1742e44163e1SJeff Mahoney /* 1743e44163e1SJeff Mahoney * Setting MS_RDONLY will put the cleaner thread to 1744e44163e1SJeff Mahoney * sleep at the next loop if it's already active. 1745e44163e1SJeff Mahoney * If it's already asleep, we'll leave unused block 1746e44163e1SJeff Mahoney * groups on disk until we're mounted read-write again 1747e44163e1SJeff Mahoney * unless we clean them up here. 1748e44163e1SJeff Mahoney */ 1749e44163e1SJeff Mahoney btrfs_delete_unused_bgs(fs_info); 1750e44163e1SJeff Mahoney 17518dabb742SStefan Behrens btrfs_dev_replace_suspend_for_unmount(fs_info); 17528dabb742SStefan Behrens btrfs_scrub_cancel(fs_info); 1753061594efSMiao Xie btrfs_pause_balance(fs_info); 17548dabb742SStefan Behrens 1755c146afadSYan Zheng ret = btrfs_commit_super(root); 175649b25e05SJeff Mahoney if (ret) 175749b25e05SJeff Mahoney goto restore; 1758c146afadSYan Zheng } else { 17596ef3de9cSDavid Sterba if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { 17606ef3de9cSDavid Sterba btrfs_err(fs_info, 1761efe120a0SFrank Holton "Remounting read-write after error is not allowed"); 17626ef3de9cSDavid Sterba ret = -EINVAL; 17636ef3de9cSDavid Sterba goto restore; 17646ef3de9cSDavid Sterba } 17658a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 176649b25e05SJeff Mahoney ret = -EACCES; 176749b25e05SJeff Mahoney goto restore; 17688a3db184SSergei Trofimovich } 17692b82032cSYan Zheng 1770292fd7fcSStefan Behrens if (fs_info->fs_devices->missing_devices > 1771292fd7fcSStefan Behrens fs_info->num_tolerated_disk_barrier_failures && 1772292fd7fcSStefan Behrens !(*flags & MS_RDONLY)) { 1773efe120a0SFrank Holton btrfs_warn(fs_info, 1774efe120a0SFrank Holton "too many missing devices, writeable remount is not allowed"); 1775292fd7fcSStefan Behrens ret = -EACCES; 1776292fd7fcSStefan Behrens goto restore; 1777292fd7fcSStefan Behrens } 1778292fd7fcSStefan Behrens 17798a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 178049b25e05SJeff Mahoney ret = -EINVAL; 178149b25e05SJeff Mahoney goto restore; 17828a3db184SSergei Trofimovich } 1783c146afadSYan Zheng 1784815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 178549b25e05SJeff Mahoney if (ret) 178649b25e05SJeff Mahoney goto restore; 1787c146afadSYan Zheng 1788d68fc57bSYan, Zheng /* recover relocation */ 17895f316481SWang Shilong mutex_lock(&fs_info->cleaner_mutex); 1790d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 17915f316481SWang Shilong mutex_unlock(&fs_info->cleaner_mutex); 179249b25e05SJeff Mahoney if (ret) 179349b25e05SJeff Mahoney goto restore; 1794c146afadSYan Zheng 17952b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 17962b6ba629SIlya Dryomov if (ret) 17972b6ba629SIlya Dryomov goto restore; 17982b6ba629SIlya Dryomov 17998dabb742SStefan Behrens ret = btrfs_resume_dev_replace_async(fs_info); 18008dabb742SStefan Behrens if (ret) { 1801efe120a0SFrank Holton btrfs_warn(fs_info, "failed to resume dev_replace"); 18028dabb742SStefan Behrens goto restore; 18038dabb742SStefan Behrens } 180494aebfb2SJosef Bacik 180594aebfb2SJosef Bacik if (!fs_info->uuid_root) { 1806efe120a0SFrank Holton btrfs_info(fs_info, "creating UUID tree"); 180794aebfb2SJosef Bacik ret = btrfs_create_uuid_tree(fs_info); 180894aebfb2SJosef Bacik if (ret) { 1809efe120a0SFrank Holton btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); 181094aebfb2SJosef Bacik goto restore; 181194aebfb2SJosef Bacik } 181294aebfb2SJosef Bacik } 1813c146afadSYan Zheng sb->s_flags &= ~MS_RDONLY; 1814c146afadSYan Zheng } 1815dc81cdc5SMiao Xie out: 18162c6a92b0SJustin Maggard wake_up_process(fs_info->transaction_kthread); 1817dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 1818c146afadSYan Zheng return 0; 181949b25e05SJeff Mahoney 182049b25e05SJeff Mahoney restore: 182149b25e05SJeff Mahoney /* We've hit an error - don't reset MS_RDONLY */ 182249b25e05SJeff Mahoney if (sb->s_flags & MS_RDONLY) 182349b25e05SJeff Mahoney old_flags |= MS_RDONLY; 182449b25e05SJeff Mahoney sb->s_flags = old_flags; 182549b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 182649b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 182749b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 1828c018daecSMiao Xie mutex_lock(&fs_info->chunk_mutex); 182949b25e05SJeff Mahoney fs_info->alloc_start = old_alloc_start; 1830c018daecSMiao Xie mutex_unlock(&fs_info->chunk_mutex); 18310d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 18320d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 183349b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 1834dc81cdc5SMiao Xie btrfs_remount_cleanup(fs_info, old_opts); 183549b25e05SJeff Mahoney return ret; 1836c146afadSYan Zheng } 1837c146afadSYan Zheng 1838bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1839bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1840bcd53741SArne Jansen const void *dev_info2) 1841bcd53741SArne Jansen { 1842bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1843bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1844bcd53741SArne Jansen return -1; 1845bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1846bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1847bcd53741SArne Jansen return 1; 1848bcd53741SArne Jansen else 1849bcd53741SArne Jansen return 0; 1850bcd53741SArne Jansen } 1851bcd53741SArne Jansen 1852bcd53741SArne Jansen /* 1853bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1854bcd53741SArne Jansen * is stored.(Descending Sort) 1855bcd53741SArne Jansen */ 1856bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1857bcd53741SArne Jansen struct btrfs_device_info *devices, 1858bcd53741SArne Jansen size_t nr_devices) 1859bcd53741SArne Jansen { 1860bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1861bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1862bcd53741SArne Jansen } 1863bcd53741SArne Jansen 18646d07bcecSMiao Xie /* 18656d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 18666d07bcecSMiao Xie * file data. 18676d07bcecSMiao Xie */ 18686d07bcecSMiao Xie static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 18696d07bcecSMiao Xie { 18706d07bcecSMiao Xie struct btrfs_fs_info *fs_info = root->fs_info; 18716d07bcecSMiao Xie struct btrfs_device_info *devices_info; 18726d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 18736d07bcecSMiao Xie struct btrfs_device *device; 18746d07bcecSMiao Xie u64 skip_space; 18756d07bcecSMiao Xie u64 type; 18766d07bcecSMiao Xie u64 avail_space; 18776d07bcecSMiao Xie u64 used_space; 18786d07bcecSMiao Xie u64 min_stripe_size; 187939fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 18806d07bcecSMiao Xie int i = 0, nr_devices; 18816d07bcecSMiao Xie int ret; 18826d07bcecSMiao Xie 18837e33fd99SJosef Bacik /* 18847e33fd99SJosef Bacik * We aren't under the device list lock, so this is racey-ish, but good 18857e33fd99SJosef Bacik * enough for our purposes. 18867e33fd99SJosef Bacik */ 1887b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 18887e33fd99SJosef Bacik if (!nr_devices) { 18897e33fd99SJosef Bacik smp_mb(); 18907e33fd99SJosef Bacik nr_devices = fs_info->fs_devices->open_devices; 18917e33fd99SJosef Bacik ASSERT(nr_devices); 18927e33fd99SJosef Bacik if (!nr_devices) { 18937e33fd99SJosef Bacik *free_bytes = 0; 18947e33fd99SJosef Bacik return 0; 18957e33fd99SJosef Bacik } 18967e33fd99SJosef Bacik } 18976d07bcecSMiao Xie 1898d9b0d9baSDulshani Gunawardhana devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), 18996d07bcecSMiao Xie GFP_NOFS); 19006d07bcecSMiao Xie if (!devices_info) 19016d07bcecSMiao Xie return -ENOMEM; 19026d07bcecSMiao Xie 19036d07bcecSMiao Xie /* calc min stripe number for data space alloction */ 19046d07bcecSMiao Xie type = btrfs_get_alloc_profile(root, 1); 190539fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 19066d07bcecSMiao Xie min_stripes = 2; 190739fb26c3SMiao Xie num_stripes = nr_devices; 190839fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 19096d07bcecSMiao Xie min_stripes = 2; 191039fb26c3SMiao Xie num_stripes = 2; 191139fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 19126d07bcecSMiao Xie min_stripes = 4; 191339fb26c3SMiao Xie num_stripes = 4; 191439fb26c3SMiao Xie } 19156d07bcecSMiao Xie 19166d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 19176d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 19186d07bcecSMiao Xie else 19196d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 19206d07bcecSMiao Xie 19217e33fd99SJosef Bacik if (fs_info->alloc_start) 19227e33fd99SJosef Bacik mutex_lock(&fs_devices->device_list_mutex); 19237e33fd99SJosef Bacik rcu_read_lock(); 19247e33fd99SJosef Bacik list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { 192563a212abSStefan Behrens if (!device->in_fs_metadata || !device->bdev || 192663a212abSStefan Behrens device->is_tgtdev_for_dev_replace) 19276d07bcecSMiao Xie continue; 19286d07bcecSMiao Xie 19297e33fd99SJosef Bacik if (i >= nr_devices) 19307e33fd99SJosef Bacik break; 19317e33fd99SJosef Bacik 19326d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 19336d07bcecSMiao Xie 19346d07bcecSMiao Xie /* align with stripe_len */ 1935f8c269d7SDavid Sterba avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); 19366d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 19376d07bcecSMiao Xie 19386d07bcecSMiao Xie /* 19396d07bcecSMiao Xie * In order to avoid overwritting the superblock on the drive, 19406d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 19416d07bcecSMiao Xie * allocation. 19426d07bcecSMiao Xie */ 1943ee22184bSByongho Lee skip_space = SZ_1M; 19446d07bcecSMiao Xie 19456d07bcecSMiao Xie /* user can set the offset in fs_info->alloc_start. */ 19467e33fd99SJosef Bacik if (fs_info->alloc_start && 19477e33fd99SJosef Bacik fs_info->alloc_start + BTRFS_STRIPE_LEN <= 19487e33fd99SJosef Bacik device->total_bytes) { 19497e33fd99SJosef Bacik rcu_read_unlock(); 19506d07bcecSMiao Xie skip_space = max(fs_info->alloc_start, skip_space); 19516d07bcecSMiao Xie 19526d07bcecSMiao Xie /* 19537e33fd99SJosef Bacik * btrfs can not use the free space in 19547e33fd99SJosef Bacik * [0, skip_space - 1], we must subtract it from the 19557e33fd99SJosef Bacik * total. In order to implement it, we account the used 19567e33fd99SJosef Bacik * space in this range first. 19576d07bcecSMiao Xie */ 19587e33fd99SJosef Bacik ret = btrfs_account_dev_extents_size(device, 0, 19597e33fd99SJosef Bacik skip_space - 1, 19606d07bcecSMiao Xie &used_space); 19616d07bcecSMiao Xie if (ret) { 19626d07bcecSMiao Xie kfree(devices_info); 19637e33fd99SJosef Bacik mutex_unlock(&fs_devices->device_list_mutex); 19646d07bcecSMiao Xie return ret; 19656d07bcecSMiao Xie } 19666d07bcecSMiao Xie 19677e33fd99SJosef Bacik rcu_read_lock(); 19687e33fd99SJosef Bacik 19696d07bcecSMiao Xie /* calc the free space in [0, skip_space - 1] */ 19706d07bcecSMiao Xie skip_space -= used_space; 19717e33fd99SJosef Bacik } 19726d07bcecSMiao Xie 19736d07bcecSMiao Xie /* 19746d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 19756d07bcecSMiao Xie * it from the total. 19766d07bcecSMiao Xie */ 19776d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 19786d07bcecSMiao Xie avail_space -= skip_space; 19796d07bcecSMiao Xie else 19806d07bcecSMiao Xie avail_space = 0; 19816d07bcecSMiao Xie 19826d07bcecSMiao Xie if (avail_space < min_stripe_size) 19836d07bcecSMiao Xie continue; 19846d07bcecSMiao Xie 19856d07bcecSMiao Xie devices_info[i].dev = device; 19866d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 19876d07bcecSMiao Xie 19886d07bcecSMiao Xie i++; 19896d07bcecSMiao Xie } 19907e33fd99SJosef Bacik rcu_read_unlock(); 19917e33fd99SJosef Bacik if (fs_info->alloc_start) 19927e33fd99SJosef Bacik mutex_unlock(&fs_devices->device_list_mutex); 19936d07bcecSMiao Xie 19946d07bcecSMiao Xie nr_devices = i; 19956d07bcecSMiao Xie 19966d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 19976d07bcecSMiao Xie 19986d07bcecSMiao Xie i = nr_devices - 1; 19996d07bcecSMiao Xie avail_space = 0; 20006d07bcecSMiao Xie while (nr_devices >= min_stripes) { 200139fb26c3SMiao Xie if (num_stripes > nr_devices) 200239fb26c3SMiao Xie num_stripes = nr_devices; 200339fb26c3SMiao Xie 20046d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 20056d07bcecSMiao Xie int j; 20066d07bcecSMiao Xie u64 alloc_size; 20076d07bcecSMiao Xie 200839fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 20096d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 201039fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 20116d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 20126d07bcecSMiao Xie } 20136d07bcecSMiao Xie i--; 20146d07bcecSMiao Xie nr_devices--; 20156d07bcecSMiao Xie } 20166d07bcecSMiao Xie 20176d07bcecSMiao Xie kfree(devices_info); 20186d07bcecSMiao Xie *free_bytes = avail_space; 20196d07bcecSMiao Xie return 0; 20206d07bcecSMiao Xie } 20216d07bcecSMiao Xie 2022ba7b6e62SDavid Sterba /* 2023ba7b6e62SDavid Sterba * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. 2024ba7b6e62SDavid Sterba * 2025ba7b6e62SDavid Sterba * If there's a redundant raid level at DATA block groups, use the respective 2026ba7b6e62SDavid Sterba * multiplier to scale the sizes. 2027ba7b6e62SDavid Sterba * 2028ba7b6e62SDavid Sterba * Unused device space usage is based on simulating the chunk allocator 2029ba7b6e62SDavid Sterba * algorithm that respects the device sizes, order of allocations and the 2030ba7b6e62SDavid Sterba * 'alloc_start' value, this is a close approximation of the actual use but 2031ba7b6e62SDavid Sterba * there are other factors that may change the result (like a new metadata 2032ba7b6e62SDavid Sterba * chunk). 2033ba7b6e62SDavid Sterba * 2034ca8a51b3SDavid Sterba * If metadata is exhausted, f_bavail will be 0. 2035ca8a51b3SDavid Sterba * 2036ba7b6e62SDavid Sterba * FIXME: not accurate for mixed block groups, total and free/used are ok, 2037ba7b6e62SDavid Sterba * available appears slightly larger. 2038ba7b6e62SDavid Sterba */ 20398fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 20408fd17795SChris Mason { 2041815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 2042815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 2043815745cfSAl Viro struct list_head *head = &fs_info->space_info; 2044bd4d1088SJosef Bacik struct btrfs_space_info *found; 2045bd4d1088SJosef Bacik u64 total_used = 0; 20466d07bcecSMiao Xie u64 total_free_data = 0; 2047ca8a51b3SDavid Sterba u64 total_free_meta = 0; 2048db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 2049815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 2050ba7b6e62SDavid Sterba unsigned factor = 1; 2051ba7b6e62SDavid Sterba struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 20526d07bcecSMiao Xie int ret; 2053ca8a51b3SDavid Sterba u64 thresh = 0; 20548fd17795SChris Mason 205515484377SMiao Xie /* 205615484377SMiao Xie * holding chunk_muext to avoid allocating new chunks, holding 205715484377SMiao Xie * device_list_mutex to avoid the device being removed 205815484377SMiao Xie */ 2059bd4d1088SJosef Bacik rcu_read_lock(); 206089a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 20616d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 2062ba7b6e62SDavid Sterba int i; 2063ba7b6e62SDavid Sterba 20646d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 20656d07bcecSMiao Xie total_free_data -= 20666d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 2067ba7b6e62SDavid Sterba 2068ba7b6e62SDavid Sterba for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { 2069ba7b6e62SDavid Sterba if (!list_empty(&found->block_groups[i])) { 2070ba7b6e62SDavid Sterba switch (i) { 2071ba7b6e62SDavid Sterba case BTRFS_RAID_DUP: 2072ba7b6e62SDavid Sterba case BTRFS_RAID_RAID1: 2073ba7b6e62SDavid Sterba case BTRFS_RAID_RAID10: 2074ba7b6e62SDavid Sterba factor = 2; 2075ba7b6e62SDavid Sterba } 2076ba7b6e62SDavid Sterba } 2077ba7b6e62SDavid Sterba } 20786d07bcecSMiao Xie } 2079ca8a51b3SDavid Sterba if (found->flags & BTRFS_BLOCK_GROUP_METADATA) 2080ca8a51b3SDavid Sterba total_free_meta += found->disk_total - found->disk_used; 20816d07bcecSMiao Xie 2082b742bb82SYan, Zheng total_used += found->disk_used; 208389a55897SJosef Bacik } 2084ba7b6e62SDavid Sterba 2085bd4d1088SJosef Bacik rcu_read_unlock(); 2086bd4d1088SJosef Bacik 2087ba7b6e62SDavid Sterba buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); 2088ba7b6e62SDavid Sterba buf->f_blocks >>= bits; 2089ba7b6e62SDavid Sterba buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); 2090ba7b6e62SDavid Sterba 2091ba7b6e62SDavid Sterba /* Account global block reserve as used, it's in logical size already */ 2092ba7b6e62SDavid Sterba spin_lock(&block_rsv->lock); 2093ba7b6e62SDavid Sterba buf->f_bfree -= block_rsv->size >> bits; 2094ba7b6e62SDavid Sterba spin_unlock(&block_rsv->lock); 2095ba7b6e62SDavid Sterba 20960d95c1beSDavid Sterba buf->f_bavail = div_u64(total_free_data, factor); 2097815745cfSAl Viro ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 20987e33fd99SJosef Bacik if (ret) 20996d07bcecSMiao Xie return ret; 2100ba7b6e62SDavid Sterba buf->f_bavail += div_u64(total_free_data, factor); 21016d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 2102d397712bSChris Mason 2103ca8a51b3SDavid Sterba /* 2104ca8a51b3SDavid Sterba * We calculate the remaining metadata space minus global reserve. If 2105ca8a51b3SDavid Sterba * this is (supposedly) smaller than zero, there's no space. But this 2106ca8a51b3SDavid Sterba * does not hold in practice, the exhausted state happens where's still 2107ca8a51b3SDavid Sterba * some positive delta. So we apply some guesswork and compare the 2108ca8a51b3SDavid Sterba * delta to a 4M threshold. (Practically observed delta was ~2M.) 2109ca8a51b3SDavid Sterba * 2110ca8a51b3SDavid Sterba * We probably cannot calculate the exact threshold value because this 2111ca8a51b3SDavid Sterba * depends on the internal reservations requested by various 2112ca8a51b3SDavid Sterba * operations, so some operations that consume a few metadata will 2113ca8a51b3SDavid Sterba * succeed even if the Avail is zero. But this is better than the other 2114ca8a51b3SDavid Sterba * way around. 2115ca8a51b3SDavid Sterba */ 2116ca8a51b3SDavid Sterba thresh = 4 * 1024 * 1024; 2117ca8a51b3SDavid Sterba 2118ca8a51b3SDavid Sterba if (total_free_meta - thresh < block_rsv->size) 2119ca8a51b3SDavid Sterba buf->f_bavail = 0; 2120ca8a51b3SDavid Sterba 2121ba7b6e62SDavid Sterba buf->f_type = BTRFS_SUPER_MAGIC; 2122ba7b6e62SDavid Sterba buf->f_bsize = dentry->d_sb->s_blocksize; 2123ba7b6e62SDavid Sterba buf->f_namelen = BTRFS_NAME_LEN; 2124ba7b6e62SDavid Sterba 21259d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 21269d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 21279d03632eSDavid Woodhouse on a big-endian or little-endian host */ 21289d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 21299d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 213032d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 21312b0143b5SDavid Howells buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; 21322b0143b5SDavid Howells buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; 213332d48fa1SDavid Woodhouse 21348fd17795SChris Mason return 0; 21358fd17795SChris Mason } 2136b5133862SChris Mason 2137aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 2138aea52e19SAl Viro { 2139815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 2140aea52e19SAl Viro kill_anon_super(sb); 2141aea52e19SAl Viro free_fs_info(fs_info); 2142aea52e19SAl Viro } 2143aea52e19SAl Viro 21442e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 21452e635a27SChris Mason .owner = THIS_MODULE, 21462e635a27SChris Mason .name = "btrfs", 2147061dbc6bSAl Viro .mount = btrfs_mount, 2148aea52e19SAl Viro .kill_sb = btrfs_kill_super, 2149f667aef6SQu Wenruo .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, 21502e635a27SChris Mason }; 21517f78e035SEric W. Biederman MODULE_ALIAS_FS("btrfs"); 2152a9218f6bSChris Mason 2153d8620958STom Van Braeckel static int btrfs_control_open(struct inode *inode, struct file *file) 2154d8620958STom Van Braeckel { 2155d8620958STom Van Braeckel /* 2156d8620958STom Van Braeckel * The control file's private_data is used to hold the 2157d8620958STom Van Braeckel * transaction when it is started and is used to keep 2158d8620958STom Van Braeckel * track of whether a transaction is already in progress. 2159d8620958STom Van Braeckel */ 2160d8620958STom Van Braeckel file->private_data = NULL; 2161d8620958STom Van Braeckel return 0; 2162d8620958STom Van Braeckel } 2163d8620958STom Van Braeckel 2164d352ac68SChris Mason /* 2165d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 2166d352ac68SChris Mason */ 21678a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 21688a4b83ccSChris Mason unsigned long arg) 21698a4b83ccSChris Mason { 21708a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 21718a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 2172c071fcfdSChris Mason int ret = -ENOTTY; 21738a4b83ccSChris Mason 2174e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 2175e441d54dSChris Mason return -EPERM; 2176e441d54dSChris Mason 2177dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 2178dae7b665SLi Zefan if (IS_ERR(vol)) 2179dae7b665SLi Zefan return PTR_ERR(vol); 2180c071fcfdSChris Mason 21818a4b83ccSChris Mason switch (cmd) { 21828a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 218397288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 21848a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 21858a4b83ccSChris Mason break; 218602db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 218702db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 218802db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 218902db0844SJosef Bacik if (ret) 219002db0844SJosef Bacik break; 219102db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 219202db0844SJosef Bacik break; 2193c5868f83SDavid Sterba case BTRFS_IOC_GET_SUPPORTED_FEATURES: 2194d5131b65SDavid Sterba ret = btrfs_ioctl_get_supported_features((void __user*)arg); 2195c5868f83SDavid Sterba break; 21968a4b83ccSChris Mason } 2197dae7b665SLi Zefan 21988a4b83ccSChris Mason kfree(vol); 2199f819d837SLinda Knippers return ret; 22008a4b83ccSChris Mason } 22018a4b83ccSChris Mason 22020176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 2203ed0dab6bSYan { 2204354aa0fbSMiao Xie struct btrfs_trans_handle *trans; 2205354aa0fbSMiao Xie struct btrfs_root *root = btrfs_sb(sb)->tree_root; 2206354aa0fbSMiao Xie 2207d4edf39bSMiao Xie trans = btrfs_attach_transaction_barrier(root); 2208354aa0fbSMiao Xie if (IS_ERR(trans)) { 2209354aa0fbSMiao Xie /* no transaction, don't bother */ 2210354aa0fbSMiao Xie if (PTR_ERR(trans) == -ENOENT) 22110176260fSLinus Torvalds return 0; 2212354aa0fbSMiao Xie return PTR_ERR(trans); 2213354aa0fbSMiao Xie } 2214354aa0fbSMiao Xie return btrfs_commit_transaction(trans, root); 2215ed0dab6bSYan } 2216ed0dab6bSYan 22179c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 22189c5085c1SJosef Bacik { 22199c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 22209c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 22219c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 22229c5085c1SJosef Bacik struct list_head *head; 22239c5085c1SJosef Bacik struct rcu_string *name; 22249c5085c1SJosef Bacik 22259c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 22269c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 22279c5085c1SJosef Bacik while (cur_devices) { 22289c5085c1SJosef Bacik head = &cur_devices->devices; 22299c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 2230aa9ddcd4SJosef Bacik if (dev->missing) 2231aa9ddcd4SJosef Bacik continue; 22320aeb8a6eSAnand Jain if (!dev->name) 22330aeb8a6eSAnand Jain continue; 22349c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 22359c5085c1SJosef Bacik first_dev = dev; 22369c5085c1SJosef Bacik } 22379c5085c1SJosef Bacik cur_devices = cur_devices->seed; 22389c5085c1SJosef Bacik } 22399c5085c1SJosef Bacik 22409c5085c1SJosef Bacik if (first_dev) { 22419c5085c1SJosef Bacik rcu_read_lock(); 22429c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 22439c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 22449c5085c1SJosef Bacik rcu_read_unlock(); 22459c5085c1SJosef Bacik } else { 22469c5085c1SJosef Bacik WARN_ON(1); 22479c5085c1SJosef Bacik } 22489c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 22499c5085c1SJosef Bacik return 0; 22509c5085c1SJosef Bacik } 22519c5085c1SJosef Bacik 2252b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 225376dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 2254bd555975SAl Viro .evict_inode = btrfs_evict_inode, 2255e20d96d6SChris Mason .put_super = btrfs_put_super, 2256d5719762SChris Mason .sync_fs = btrfs_sync_fs, 2257a9572a15SEric Paris .show_options = btrfs_show_options, 22589c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 22594730a4bcSChris Mason .write_inode = btrfs_write_inode, 22602c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 22612c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 22628fd17795SChris Mason .statfs = btrfs_statfs, 2263c146afadSYan Zheng .remount_fs = btrfs_remount, 22640176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 2265e20d96d6SChris Mason }; 2266a9218f6bSChris Mason 2267a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 2268d8620958STom Van Braeckel .open = btrfs_control_open, 2269a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 2270a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 2271a9218f6bSChris Mason .owner = THIS_MODULE, 22726038f373SArnd Bergmann .llseek = noop_llseek, 2273a9218f6bSChris Mason }; 2274a9218f6bSChris Mason 2275a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 2276578454ffSKay Sievers .minor = BTRFS_MINOR, 2277a9218f6bSChris Mason .name = "btrfs-control", 2278a9218f6bSChris Mason .fops = &btrfs_ctl_fops 2279a9218f6bSChris Mason }; 2280a9218f6bSChris Mason 2281578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2282578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 2283578454ffSKay Sievers 2284a9218f6bSChris Mason static int btrfs_interface_init(void) 2285a9218f6bSChris Mason { 2286a9218f6bSChris Mason return misc_register(&btrfs_misc); 2287a9218f6bSChris Mason } 2288a9218f6bSChris Mason 2289b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 2290a9218f6bSChris Mason { 2291f368ed60SGreg Kroah-Hartman misc_deregister(&btrfs_misc); 2292a9218f6bSChris Mason } 2293a9218f6bSChris Mason 22948ae1af3cSAnand Jain static void btrfs_print_mod_info(void) 229585965600SDavid Sterba { 229685965600SDavid Sterba printk(KERN_INFO "Btrfs loaded" 229785965600SDavid Sterba #ifdef CONFIG_BTRFS_DEBUG 229885965600SDavid Sterba ", debug=on" 229985965600SDavid Sterba #endif 230079556c3dSStefan Behrens #ifdef CONFIG_BTRFS_ASSERT 230179556c3dSStefan Behrens ", assert=on" 230279556c3dSStefan Behrens #endif 230385965600SDavid Sterba #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 230485965600SDavid Sterba ", integrity-checker=on" 230585965600SDavid Sterba #endif 230685965600SDavid Sterba "\n"); 230785965600SDavid Sterba } 230885965600SDavid Sterba 2309dc11dd5dSJosef Bacik static int btrfs_run_sanity_tests(void) 2310dc11dd5dSJosef Bacik { 231106ea65a3SJosef Bacik int ret; 231206ea65a3SJosef Bacik 2313294e30feSJosef Bacik ret = btrfs_init_test_fs(); 231406ea65a3SJosef Bacik if (ret) 231506ea65a3SJosef Bacik return ret; 2316294e30feSJosef Bacik 2317294e30feSJosef Bacik ret = btrfs_test_free_space_cache(); 2318294e30feSJosef Bacik if (ret) 2319294e30feSJosef Bacik goto out; 2320294e30feSJosef Bacik ret = btrfs_test_extent_buffer_operations(); 2321294e30feSJosef Bacik if (ret) 2322294e30feSJosef Bacik goto out; 2323294e30feSJosef Bacik ret = btrfs_test_extent_io(); 2324aaedb55bSJosef Bacik if (ret) 2325aaedb55bSJosef Bacik goto out; 2326aaedb55bSJosef Bacik ret = btrfs_test_inodes(); 2327faa2dbf0SJosef Bacik if (ret) 2328faa2dbf0SJosef Bacik goto out; 2329faa2dbf0SJosef Bacik ret = btrfs_test_qgroups(); 23307c55ee0cSOmar Sandoval if (ret) 23317c55ee0cSOmar Sandoval goto out; 23327c55ee0cSOmar Sandoval ret = btrfs_test_free_space_tree(); 2333294e30feSJosef Bacik out: 2334294e30feSJosef Bacik btrfs_destroy_test_fs(); 2335294e30feSJosef Bacik return ret; 2336dc11dd5dSJosef Bacik } 2337dc11dd5dSJosef Bacik 23382e635a27SChris Mason static int __init init_btrfs_fs(void) 23392e635a27SChris Mason { 23402c90e5d6SChris Mason int err; 234158176a96SJosef Bacik 234214a958e6SFilipe David Borba Manana err = btrfs_hash_init(); 234314a958e6SFilipe David Borba Manana if (err) 234414a958e6SFilipe David Borba Manana return err; 234514a958e6SFilipe David Borba Manana 234663541927SFilipe David Borba Manana btrfs_props_init(); 234763541927SFilipe David Borba Manana 234858176a96SJosef Bacik err = btrfs_init_sysfs(); 234958176a96SJosef Bacik if (err) 235014a958e6SFilipe David Borba Manana goto free_hash; 235158176a96SJosef Bacik 2352143bede5SJeff Mahoney btrfs_init_compress(); 2353d1310b2eSChris Mason 2354261507a0SLi Zefan err = btrfs_init_cachep(); 2355261507a0SLi Zefan if (err) 2356261507a0SLi Zefan goto free_compress; 2357261507a0SLi Zefan 2358d1310b2eSChris Mason err = extent_io_init(); 23592f4cbe64SWyatt Banks if (err) 23602f4cbe64SWyatt Banks goto free_cachep; 23612f4cbe64SWyatt Banks 2362d1310b2eSChris Mason err = extent_map_init(); 2363d1310b2eSChris Mason if (err) 2364d1310b2eSChris Mason goto free_extent_io; 2365d1310b2eSChris Mason 23666352b91dSMiao Xie err = ordered_data_init(); 23672f4cbe64SWyatt Banks if (err) 23682f4cbe64SWyatt Banks goto free_extent_map; 2369c8b97818SChris Mason 23706352b91dSMiao Xie err = btrfs_delayed_inode_init(); 23716352b91dSMiao Xie if (err) 23726352b91dSMiao Xie goto free_ordered_data; 23736352b91dSMiao Xie 23749247f317SMiao Xie err = btrfs_auto_defrag_init(); 237516cdcec7SMiao Xie if (err) 237616cdcec7SMiao Xie goto free_delayed_inode; 237716cdcec7SMiao Xie 237878a6184aSMiao Xie err = btrfs_delayed_ref_init(); 23799247f317SMiao Xie if (err) 23809247f317SMiao Xie goto free_auto_defrag; 23819247f317SMiao Xie 2382b9e9a6cbSWang Shilong err = btrfs_prelim_ref_init(); 2383b9e9a6cbSWang Shilong if (err) 2384af13b492SDavid Sterba goto free_delayed_ref; 2385b9e9a6cbSWang Shilong 238697eb6b69SDavid Sterba err = btrfs_end_io_wq_init(); 238778a6184aSMiao Xie if (err) 2388af13b492SDavid Sterba goto free_prelim_ref; 238978a6184aSMiao Xie 239097eb6b69SDavid Sterba err = btrfs_interface_init(); 239197eb6b69SDavid Sterba if (err) 239297eb6b69SDavid Sterba goto free_end_io_wq; 239397eb6b69SDavid Sterba 2394e565d4b9SJan Schmidt btrfs_init_lockdep(); 2395e565d4b9SJan Schmidt 23968ae1af3cSAnand Jain btrfs_print_mod_info(); 2397dc11dd5dSJosef Bacik 2398dc11dd5dSJosef Bacik err = btrfs_run_sanity_tests(); 2399dc11dd5dSJosef Bacik if (err) 2400dc11dd5dSJosef Bacik goto unregister_ioctl; 2401dc11dd5dSJosef Bacik 2402dc11dd5dSJosef Bacik err = register_filesystem(&btrfs_fs_type); 2403dc11dd5dSJosef Bacik if (err) 2404dc11dd5dSJosef Bacik goto unregister_ioctl; 240574255aa0SJosef Bacik 24062f4cbe64SWyatt Banks return 0; 24072f4cbe64SWyatt Banks 2408a9218f6bSChris Mason unregister_ioctl: 2409a9218f6bSChris Mason btrfs_interface_exit(); 241097eb6b69SDavid Sterba free_end_io_wq: 241197eb6b69SDavid Sterba btrfs_end_io_wq_exit(); 2412b9e9a6cbSWang Shilong free_prelim_ref: 2413b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 241478a6184aSMiao Xie free_delayed_ref: 241578a6184aSMiao Xie btrfs_delayed_ref_exit(); 24169247f317SMiao Xie free_auto_defrag: 24179247f317SMiao Xie btrfs_auto_defrag_exit(); 241816cdcec7SMiao Xie free_delayed_inode: 241916cdcec7SMiao Xie btrfs_delayed_inode_exit(); 24206352b91dSMiao Xie free_ordered_data: 24216352b91dSMiao Xie ordered_data_exit(); 24222f4cbe64SWyatt Banks free_extent_map: 24232f4cbe64SWyatt Banks extent_map_exit(); 2424d1310b2eSChris Mason free_extent_io: 2425d1310b2eSChris Mason extent_io_exit(); 24262f4cbe64SWyatt Banks free_cachep: 24272f4cbe64SWyatt Banks btrfs_destroy_cachep(); 2428261507a0SLi Zefan free_compress: 2429261507a0SLi Zefan btrfs_exit_compress(); 24302f4cbe64SWyatt Banks btrfs_exit_sysfs(); 243114a958e6SFilipe David Borba Manana free_hash: 243214a958e6SFilipe David Borba Manana btrfs_hash_exit(); 24332c90e5d6SChris Mason return err; 24342e635a27SChris Mason } 24352e635a27SChris Mason 24362e635a27SChris Mason static void __exit exit_btrfs_fs(void) 24372e635a27SChris Mason { 243839279cc3SChris Mason btrfs_destroy_cachep(); 243978a6184aSMiao Xie btrfs_delayed_ref_exit(); 24409247f317SMiao Xie btrfs_auto_defrag_exit(); 244116cdcec7SMiao Xie btrfs_delayed_inode_exit(); 2442b9e9a6cbSWang Shilong btrfs_prelim_ref_exit(); 24436352b91dSMiao Xie ordered_data_exit(); 2444a52d9a80SChris Mason extent_map_exit(); 2445d1310b2eSChris Mason extent_io_exit(); 2446a9218f6bSChris Mason btrfs_interface_exit(); 24475ed5f588SJosef Bacik btrfs_end_io_wq_exit(); 24482e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 244958176a96SJosef Bacik btrfs_exit_sysfs(); 24508a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 2451261507a0SLi Zefan btrfs_exit_compress(); 245214a958e6SFilipe David Borba Manana btrfs_hash_exit(); 24532e635a27SChris Mason } 24542e635a27SChris Mason 245560efa5ebSFilipe David Borba Manana late_initcall(init_btrfs_fs); 24562e635a27SChris Mason module_exit(exit_btrfs_fs) 24572e635a27SChris Mason 24582e635a27SChris Mason MODULE_LICENSE("GPL"); 2459