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> 444b4e25f2SChris Mason #include "compat.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" 50c5739bbaSChris Mason #include "ioctl.h" 513a686375SChris Mason #include "print-tree.h" 525103e947SJosef Bacik #include "xattr.h" 538a4b83ccSChris Mason #include "volumes.h" 54b3c3da71SChris Mason #include "version.h" 55be6e8dc0SBalaji Rao #include "export.h" 56c8b97818SChris Mason #include "compression.h" 579c5085c1SJosef Bacik #include "rcu-string.h" 582e635a27SChris Mason 591abe9b8aSliubo #define CREATE_TRACE_POINTS 601abe9b8aSliubo #include <trace/events/btrfs.h> 611abe9b8aSliubo 62b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops; 63830c4adbSJosef Bacik static struct file_system_type btrfs_fs_type; 64e20d96d6SChris Mason 65acce952bSliubo static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, 66acce952bSliubo char nbuf[16]) 67acce952bSliubo { 68acce952bSliubo char *errstr = NULL; 69acce952bSliubo 70acce952bSliubo switch (errno) { 71acce952bSliubo case -EIO: 72acce952bSliubo errstr = "IO failure"; 73acce952bSliubo break; 74acce952bSliubo case -ENOMEM: 75acce952bSliubo errstr = "Out of memory"; 76acce952bSliubo break; 77acce952bSliubo case -EROFS: 78acce952bSliubo errstr = "Readonly filesystem"; 79acce952bSliubo break; 808c342930SJeff Mahoney case -EEXIST: 818c342930SJeff Mahoney errstr = "Object already exists"; 828c342930SJeff Mahoney break; 83acce952bSliubo default: 84acce952bSliubo if (nbuf) { 85acce952bSliubo if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 86acce952bSliubo errstr = nbuf; 87acce952bSliubo } 88acce952bSliubo break; 89acce952bSliubo } 90acce952bSliubo 91acce952bSliubo return errstr; 92acce952bSliubo } 93acce952bSliubo 94acce952bSliubo static void __save_error_info(struct btrfs_fs_info *fs_info) 95acce952bSliubo { 96acce952bSliubo /* 97acce952bSliubo * today we only save the error info into ram. Long term we'll 98acce952bSliubo * also send it down to the disk 99acce952bSliubo */ 100acce952bSliubo fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; 101acce952bSliubo } 102acce952bSliubo 103acce952bSliubo static void save_error_info(struct btrfs_fs_info *fs_info) 104acce952bSliubo { 105acce952bSliubo __save_error_info(fs_info); 106acce952bSliubo } 107acce952bSliubo 108acce952bSliubo /* btrfs handle error by forcing the filesystem readonly */ 109acce952bSliubo static void btrfs_handle_error(struct btrfs_fs_info *fs_info) 110acce952bSliubo { 111acce952bSliubo struct super_block *sb = fs_info->sb; 112acce952bSliubo 113acce952bSliubo if (sb->s_flags & MS_RDONLY) 114acce952bSliubo return; 115acce952bSliubo 116acce952bSliubo if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { 117acce952bSliubo sb->s_flags |= MS_RDONLY; 118acce952bSliubo printk(KERN_INFO "btrfs is forced readonly\n"); 11949b25e05SJeff Mahoney __btrfs_scrub_cancel(fs_info); 12049b25e05SJeff Mahoney // WARN_ON(1); 121acce952bSliubo } 122acce952bSliubo } 123acce952bSliubo 124533574c6SJoe Perches #ifdef CONFIG_PRINTK 125acce952bSliubo /* 126acce952bSliubo * __btrfs_std_error decodes expected errors from the caller and 127acce952bSliubo * invokes the approciate error response. 128acce952bSliubo */ 129acce952bSliubo void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 1304da35113SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 131acce952bSliubo { 132acce952bSliubo struct super_block *sb = fs_info->sb; 133acce952bSliubo char nbuf[16]; 134acce952bSliubo const char *errstr; 1354da35113SJeff Mahoney va_list args; 1364da35113SJeff Mahoney va_start(args, fmt); 137acce952bSliubo 138acce952bSliubo /* 139acce952bSliubo * Special case: if the error is EROFS, and we're already 140acce952bSliubo * under MS_RDONLY, then it is safe here. 141acce952bSliubo */ 142acce952bSliubo if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 143acce952bSliubo return; 144acce952bSliubo 145acce952bSliubo errstr = btrfs_decode_error(fs_info, errno, nbuf); 1464da35113SJeff Mahoney if (fmt) { 1474da35113SJeff Mahoney struct va_format vaf = { 1484da35113SJeff Mahoney .fmt = fmt, 1494da35113SJeff Mahoney .va = &args, 1504da35113SJeff Mahoney }; 1514da35113SJeff Mahoney 1524da35113SJeff Mahoney printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s (%pV)\n", 1534da35113SJeff Mahoney sb->s_id, function, line, errstr, &vaf); 1544da35113SJeff Mahoney } else { 155acce952bSliubo printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", 156acce952bSliubo sb->s_id, function, line, errstr); 1574da35113SJeff Mahoney } 158acce952bSliubo 1594da35113SJeff Mahoney /* Don't go through full error handling during mount */ 1604da35113SJeff Mahoney if (sb->s_flags & MS_BORN) { 1614da35113SJeff Mahoney save_error_info(fs_info); 162acce952bSliubo btrfs_handle_error(fs_info); 163acce952bSliubo } 1644da35113SJeff Mahoney va_end(args); 1654da35113SJeff Mahoney } 1664da35113SJeff Mahoney 167533574c6SJoe Perches static const char * const logtypes[] = { 1684da35113SJeff Mahoney "emergency", 1694da35113SJeff Mahoney "alert", 1704da35113SJeff Mahoney "critical", 1714da35113SJeff Mahoney "error", 1724da35113SJeff Mahoney "warning", 1734da35113SJeff Mahoney "notice", 1744da35113SJeff Mahoney "info", 1754da35113SJeff Mahoney "debug", 1764da35113SJeff Mahoney }; 1774da35113SJeff Mahoney 1784da35113SJeff Mahoney void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...) 1794da35113SJeff Mahoney { 1804da35113SJeff Mahoney struct super_block *sb = fs_info->sb; 1814da35113SJeff Mahoney char lvl[4]; 1824da35113SJeff Mahoney struct va_format vaf; 1834da35113SJeff Mahoney va_list args; 1844da35113SJeff Mahoney const char *type = logtypes[4]; 185533574c6SJoe Perches int kern_level; 1864da35113SJeff Mahoney 1874da35113SJeff Mahoney va_start(args, fmt); 1884da35113SJeff Mahoney 189533574c6SJoe Perches kern_level = printk_get_level(fmt); 190533574c6SJoe Perches if (kern_level) { 191533574c6SJoe Perches size_t size = printk_skip_level(fmt) - fmt; 192533574c6SJoe Perches memcpy(lvl, fmt, size); 193533574c6SJoe Perches lvl[size] = '\0'; 194533574c6SJoe Perches fmt += size; 195533574c6SJoe Perches type = logtypes[kern_level - '0']; 1964da35113SJeff Mahoney } else 1974da35113SJeff Mahoney *lvl = '\0'; 1984da35113SJeff Mahoney 1994da35113SJeff Mahoney vaf.fmt = fmt; 2004da35113SJeff Mahoney vaf.va = &args; 201533574c6SJoe Perches 2024da35113SJeff Mahoney printk("%sBTRFS %s (device %s): %pV", lvl, type, sb->s_id, &vaf); 203533574c6SJoe Perches 204533574c6SJoe Perches va_end(args); 2054da35113SJeff Mahoney } 206acce952bSliubo 207533574c6SJoe Perches #else 208533574c6SJoe Perches 209533574c6SJoe Perches void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 210533574c6SJoe Perches unsigned int line, int errno, const char *fmt, ...) 211533574c6SJoe Perches { 212533574c6SJoe Perches struct super_block *sb = fs_info->sb; 213533574c6SJoe Perches 214533574c6SJoe Perches /* 215533574c6SJoe Perches * Special case: if the error is EROFS, and we're already 216533574c6SJoe Perches * under MS_RDONLY, then it is safe here. 217533574c6SJoe Perches */ 218533574c6SJoe Perches if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) 219533574c6SJoe Perches return; 220533574c6SJoe Perches 221533574c6SJoe Perches /* Don't go through full error handling during mount */ 222533574c6SJoe Perches if (sb->s_flags & MS_BORN) { 223533574c6SJoe Perches save_error_info(fs_info); 224533574c6SJoe Perches btrfs_handle_error(fs_info); 225533574c6SJoe Perches } 226533574c6SJoe Perches } 227533574c6SJoe Perches #endif 228533574c6SJoe Perches 2298c342930SJeff Mahoney /* 23049b25e05SJeff Mahoney * We only mark the transaction aborted and then set the file system read-only. 23149b25e05SJeff Mahoney * This will prevent new transactions from starting or trying to join this 23249b25e05SJeff Mahoney * one. 23349b25e05SJeff Mahoney * 23449b25e05SJeff Mahoney * This means that error recovery at the call site is limited to freeing 23549b25e05SJeff Mahoney * any local memory allocations and passing the error code up without 23649b25e05SJeff Mahoney * further cleanup. The transaction should complete as it normally would 23749b25e05SJeff Mahoney * in the call path but will return -EIO. 23849b25e05SJeff Mahoney * 23949b25e05SJeff Mahoney * We'll complete the cleanup in btrfs_end_transaction and 24049b25e05SJeff Mahoney * btrfs_commit_transaction. 24149b25e05SJeff Mahoney */ 24249b25e05SJeff Mahoney void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 24349b25e05SJeff Mahoney struct btrfs_root *root, const char *function, 24449b25e05SJeff Mahoney unsigned int line, int errno) 24549b25e05SJeff Mahoney { 24679787eaaSJeff Mahoney WARN_ONCE(1, KERN_DEBUG "btrfs: Transaction aborted"); 24749b25e05SJeff Mahoney trans->aborted = errno; 24849b25e05SJeff Mahoney /* Nothing used. The other threads that have joined this 24949b25e05SJeff Mahoney * transaction may be able to continue. */ 25049b25e05SJeff Mahoney if (!trans->blocks_used) { 25169ce977aSMiao Xie char nbuf[16]; 25269ce977aSMiao Xie const char *errstr; 25369ce977aSMiao Xie 25469ce977aSMiao Xie errstr = btrfs_decode_error(root->fs_info, errno, nbuf); 25569ce977aSMiao Xie btrfs_printk(root->fs_info, 25669ce977aSMiao Xie "%s:%d: Aborting unused transaction(%s).\n", 25769ce977aSMiao Xie function, line, errstr); 25849b25e05SJeff Mahoney return; 25949b25e05SJeff Mahoney } 26049b25e05SJeff Mahoney trans->transaction->aborted = errno; 26149b25e05SJeff Mahoney __btrfs_std_error(root->fs_info, function, line, errno, NULL); 26249b25e05SJeff Mahoney } 26349b25e05SJeff Mahoney /* 2648c342930SJeff Mahoney * __btrfs_panic decodes unexpected, fatal errors from the caller, 2658c342930SJeff Mahoney * issues an alert, and either panics or BUGs, depending on mount options. 2668c342930SJeff Mahoney */ 2678c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2688c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2698c342930SJeff Mahoney { 2708c342930SJeff Mahoney char nbuf[16]; 2718c342930SJeff Mahoney char *s_id = "<unknown>"; 2728c342930SJeff Mahoney const char *errstr; 2738c342930SJeff Mahoney struct va_format vaf = { .fmt = fmt }; 2748c342930SJeff Mahoney va_list args; 2758c342930SJeff Mahoney 2768c342930SJeff Mahoney if (fs_info) 2778c342930SJeff Mahoney s_id = fs_info->sb->s_id; 2788c342930SJeff Mahoney 2798c342930SJeff Mahoney va_start(args, fmt); 2808c342930SJeff Mahoney vaf.va = &args; 2818c342930SJeff Mahoney 2828c342930SJeff Mahoney errstr = btrfs_decode_error(fs_info, errno, nbuf); 2838c342930SJeff Mahoney if (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR) 2848c342930SJeff Mahoney panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", 2858c342930SJeff Mahoney s_id, function, line, &vaf, errstr); 2868c342930SJeff Mahoney 2878c342930SJeff Mahoney printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", 2888c342930SJeff Mahoney s_id, function, line, &vaf, errstr); 2898c342930SJeff Mahoney va_end(args); 2908c342930SJeff Mahoney /* Caller calls BUG() */ 2918c342930SJeff Mahoney } 292e20d96d6SChris Mason 293e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 294e20d96d6SChris Mason { 295815745cfSAl Viro (void)close_ctree(btrfs_sb(sb)->tree_root); 296aea52e19SAl Viro /* FIXME: need to fix VFS to return error? */ 297aea52e19SAl Viro /* AV: return it _where_? ->put_super() can be triggered by any number 298aea52e19SAl Viro * of async events, up to and including delivery of SIGKILL to the 299aea52e19SAl Viro * last process that kept it busy. Or segfault in the aforementioned 300aea52e19SAl Viro * process... Whom would you report that to? 301aea52e19SAl Viro */ 302e20d96d6SChris Mason } 3032e635a27SChris Mason 30495e05289SChris Mason enum { 30573f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 306287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 307287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 308261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 309261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 31091435650SChris Mason Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, 3119555c6c1SIlya Dryomov Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, 3129555c6c1SIlya Dryomov Opt_no_space_cache, Opt_recovery, Opt_skip_balance, 31321adbd5cSStefan Behrens Opt_check_integrity, Opt_check_integrity_including_extent_data, 3148c342930SJeff Mahoney Opt_check_integrity_print_mask, Opt_fatal_errors, 3159555c6c1SIlya Dryomov Opt_err, 31695e05289SChris Mason }; 31795e05289SChris Mason 31895e05289SChris Mason static match_table_t tokens = { 319dfe25020SChris Mason {Opt_degraded, "degraded"}, 32095e05289SChris Mason {Opt_subvol, "subvol=%s"}, 32173f73415SJosef Bacik {Opt_subvolid, "subvolid=%d"}, 32243e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 323b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 324be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 32521ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 3266f568d35SChris Mason {Opt_max_inline, "max_inline=%s"}, 3278f662a76SChris Mason {Opt_alloc_start, "alloc_start=%s"}, 3284543df7eSChris Mason {Opt_thread_pool, "thread_pool=%d"}, 329c8b97818SChris Mason {Opt_compress, "compress"}, 330261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 331a555f810SChris Mason {Opt_compress_force, "compress-force"}, 332261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 333e18e4809SChris Mason {Opt_ssd, "ssd"}, 334451d7585SChris Mason {Opt_ssd_spread, "ssd_spread"}, 3353b30c22fSChris Mason {Opt_nossd, "nossd"}, 33633268eafSJosef Bacik {Opt_noacl, "noacl"}, 3373a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 338dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 33997e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 340e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 3410af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 34288c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3434260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 34491435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 345e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3464cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 3474b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3488965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 349af31f5e5SChris Mason {Opt_recovery, "recovery"}, 3509555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 35121adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 35221adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 35321adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 3548c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 35533268eafSJosef Bacik {Opt_err, NULL}, 35695e05289SChris Mason }; 35795e05289SChris Mason 358edf24abeSChristoph Hellwig /* 359edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 360edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 36149b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 362edf24abeSChristoph Hellwig */ 363edf24abeSChristoph Hellwig int btrfs_parse_options(struct btrfs_root *root, char *options) 36495e05289SChris Mason { 365edf24abeSChristoph Hellwig struct btrfs_fs_info *info = root->fs_info; 36695e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 36773bc1876SJosef Bacik char *p, *num, *orig = NULL; 36873bc1876SJosef Bacik u64 cache_gen; 3694543df7eSChris Mason int intarg; 370a7a3f7caSSage Weil int ret = 0; 371261507a0SLi Zefan char *compress_type; 372261507a0SLi Zefan bool compress_force = false; 373b6cda9bcSChris Mason 3746c41761fSDavid Sterba cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 37573bc1876SJosef Bacik if (cache_gen) 37673bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 37773bc1876SJosef Bacik 37895e05289SChris Mason if (!options) 37973bc1876SJosef Bacik goto out; 38095e05289SChris Mason 381be20aa9dSChris Mason /* 382be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 383be20aa9dSChris Mason * gets called twice 384be20aa9dSChris Mason */ 385be20aa9dSChris Mason options = kstrdup(options, GFP_NOFS); 386be20aa9dSChris Mason if (!options) 387be20aa9dSChris Mason return -ENOMEM; 388be20aa9dSChris Mason 389da495eccSJosef Bacik orig = options; 390be20aa9dSChris Mason 39195e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 39295e05289SChris Mason int token; 39395e05289SChris Mason if (!*p) 39495e05289SChris Mason continue; 39595e05289SChris Mason 39695e05289SChris Mason token = match_token(p, tokens, args); 39795e05289SChris Mason switch (token) { 398dfe25020SChris Mason case Opt_degraded: 399edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: allowing degraded mounts\n"); 400dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 401dfe25020SChris Mason break; 40295e05289SChris Mason case Opt_subvol: 40373f73415SJosef Bacik case Opt_subvolid: 404e15d0542SXin Zhong case Opt_subvolrootid: 40543e570b0SChristoph Hellwig case Opt_device: 406edf24abeSChristoph Hellwig /* 40743e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 408edf24abeSChristoph Hellwig * and can be happily ignored here. 409edf24abeSChristoph Hellwig */ 41095e05289SChris Mason break; 411b6cda9bcSChris Mason case Opt_nodatasum: 412067c28adSChris Mason printk(KERN_INFO "btrfs: setting nodatasum\n"); 413b6cda9bcSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 414be20aa9dSChris Mason break; 415be20aa9dSChris Mason case Opt_nodatacow: 416edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: setting nodatacow\n"); 417be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 418be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 419b6cda9bcSChris Mason break; 420a555f810SChris Mason case Opt_compress_force: 421261507a0SLi Zefan case Opt_compress_force_type: 422261507a0SLi Zefan compress_force = true; 423261507a0SLi Zefan case Opt_compress: 424261507a0SLi Zefan case Opt_compress_type: 425261507a0SLi Zefan if (token == Opt_compress || 426261507a0SLi Zefan token == Opt_compress_force || 427261507a0SLi Zefan strcmp(args[0].from, "zlib") == 0) { 428261507a0SLi Zefan compress_type = "zlib"; 429261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 430063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 431a6fa6faeSLi Zefan } else if (strcmp(args[0].from, "lzo") == 0) { 432a6fa6faeSLi Zefan compress_type = "lzo"; 433a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 434063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 4352b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 436063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 437063849eaSArnd Hannemann compress_type = "no"; 438063849eaSArnd Hannemann info->compress_type = BTRFS_COMPRESS_NONE; 439063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 440063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 441063849eaSArnd Hannemann compress_force = false; 442261507a0SLi Zefan } else { 443261507a0SLi Zefan ret = -EINVAL; 444261507a0SLi Zefan goto out; 445261507a0SLi Zefan } 446261507a0SLi Zefan 447261507a0SLi Zefan if (compress_force) { 448261507a0SLi Zefan btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 449261507a0SLi Zefan pr_info("btrfs: force %s compression\n", 450261507a0SLi Zefan compress_type); 451261507a0SLi Zefan } else 452261507a0SLi Zefan pr_info("btrfs: use %s compression\n", 453261507a0SLi Zefan compress_type); 454a555f810SChris Mason break; 455e18e4809SChris Mason case Opt_ssd: 456edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); 457e18e4809SChris Mason btrfs_set_opt(info->mount_opt, SSD); 458e18e4809SChris Mason break; 459451d7585SChris Mason case Opt_ssd_spread: 460451d7585SChris Mason printk(KERN_INFO "btrfs: use spread ssd " 461451d7585SChris Mason "allocation scheme\n"); 462451d7585SChris Mason btrfs_set_opt(info->mount_opt, SSD); 463451d7585SChris Mason btrfs_set_opt(info->mount_opt, SSD_SPREAD); 464451d7585SChris Mason break; 4653b30c22fSChris Mason case Opt_nossd: 466451d7585SChris Mason printk(KERN_INFO "btrfs: not using ssd allocation " 467451d7585SChris Mason "scheme\n"); 468c289811cSChris Mason btrfs_set_opt(info->mount_opt, NOSSD); 4693b30c22fSChris Mason btrfs_clear_opt(info->mount_opt, SSD); 470451d7585SChris Mason btrfs_clear_opt(info->mount_opt, SSD_SPREAD); 4713b30c22fSChris Mason break; 47221ad10cfSChris Mason case Opt_nobarrier: 473edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: turning off barriers\n"); 47421ad10cfSChris Mason btrfs_set_opt(info->mount_opt, NOBARRIER); 47521ad10cfSChris Mason break; 4764543df7eSChris Mason case Opt_thread_pool: 4774543df7eSChris Mason intarg = 0; 4784543df7eSChris Mason match_int(&args[0], &intarg); 4790d2450abSSergei Trofimovich if (intarg) 4804543df7eSChris Mason info->thread_pool_size = intarg; 4814543df7eSChris Mason break; 4826f568d35SChris Mason case Opt_max_inline: 483edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 4846f568d35SChris Mason if (num) { 48591748467SAkinobu Mita info->max_inline = memparse(num, NULL); 4866f568d35SChris Mason kfree(num); 4876f568d35SChris Mason 48815ada040SChris Mason if (info->max_inline) { 4896f568d35SChris Mason info->max_inline = max_t(u64, 49015ada040SChris Mason info->max_inline, 49115ada040SChris Mason root->sectorsize); 49215ada040SChris Mason } 493edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: max_inline at %llu\n", 49421380931SJoel Becker (unsigned long long)info->max_inline); 4956f568d35SChris Mason } 4966f568d35SChris Mason break; 4978f662a76SChris Mason case Opt_alloc_start: 498edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 4998f662a76SChris Mason if (num) { 50091748467SAkinobu Mita info->alloc_start = memparse(num, NULL); 5018f662a76SChris Mason kfree(num); 502edf24abeSChristoph Hellwig printk(KERN_INFO 503edf24abeSChristoph Hellwig "btrfs: allocations start at %llu\n", 50421380931SJoel Becker (unsigned long long)info->alloc_start); 5058f662a76SChris Mason } 5068f662a76SChris Mason break; 50733268eafSJosef Bacik case Opt_noacl: 50833268eafSJosef Bacik root->fs_info->sb->s_flags &= ~MS_POSIXACL; 50933268eafSJosef Bacik break; 5103a5e1404SSage Weil case Opt_notreelog: 5113a5e1404SSage Weil printk(KERN_INFO "btrfs: disabling tree log\n"); 5123a5e1404SSage Weil btrfs_set_opt(info->mount_opt, NOTREELOG); 5133a5e1404SSage Weil break; 514dccae999SSage Weil case Opt_flushoncommit: 515dccae999SSage Weil printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); 516dccae999SSage Weil btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); 517dccae999SSage Weil break; 51897e728d4SJosef Bacik case Opt_ratio: 51997e728d4SJosef Bacik intarg = 0; 52097e728d4SJosef Bacik match_int(&args[0], &intarg); 52197e728d4SJosef Bacik if (intarg) { 52297e728d4SJosef Bacik info->metadata_ratio = intarg; 52397e728d4SJosef Bacik printk(KERN_INFO "btrfs: metadata ratio %d\n", 52497e728d4SJosef Bacik info->metadata_ratio); 52597e728d4SJosef Bacik } 52697e728d4SJosef Bacik break; 527e244a0aeSChristoph Hellwig case Opt_discard: 528e244a0aeSChristoph Hellwig btrfs_set_opt(info->mount_opt, DISCARD); 529e244a0aeSChristoph Hellwig break; 5300af3d00bSJosef Bacik case Opt_space_cache: 5310af3d00bSJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 5320de90876SJosef Bacik break; 53373bc1876SJosef Bacik case Opt_no_space_cache: 53473bc1876SJosef Bacik printk(KERN_INFO "btrfs: disabling disk space caching\n"); 53573bc1876SJosef Bacik btrfs_clear_opt(info->mount_opt, SPACE_CACHE); 53673bc1876SJosef Bacik break; 5374b9465cbSChris Mason case Opt_inode_cache: 5384b9465cbSChris Mason printk(KERN_INFO "btrfs: enabling inode map caching\n"); 5394b9465cbSChris Mason btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); 5404b9465cbSChris Mason break; 54188c2ba3bSJosef Bacik case Opt_clear_cache: 54288c2ba3bSJosef Bacik printk(KERN_INFO "btrfs: force clearing of disk cache\n"); 54388c2ba3bSJosef Bacik btrfs_set_opt(info->mount_opt, CLEAR_CACHE); 5440af3d00bSJosef Bacik break; 5454260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 5464260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 5474260f7c7SSage Weil break; 54891435650SChris Mason case Opt_enospc_debug: 54991435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 55091435650SChris Mason break; 5514cb5300bSChris Mason case Opt_defrag: 5524cb5300bSChris Mason printk(KERN_INFO "btrfs: enabling auto defrag"); 5534cb5300bSChris Mason btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); 5544cb5300bSChris Mason break; 555af31f5e5SChris Mason case Opt_recovery: 556af31f5e5SChris Mason printk(KERN_INFO "btrfs: enabling auto recovery"); 557af31f5e5SChris Mason btrfs_set_opt(info->mount_opt, RECOVERY); 558af31f5e5SChris Mason break; 5599555c6c1SIlya Dryomov case Opt_skip_balance: 5609555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 5619555c6c1SIlya Dryomov break; 56221adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 56321adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 56421adbd5cSStefan Behrens printk(KERN_INFO "btrfs: enabling check integrity" 56521adbd5cSStefan Behrens " including extent data\n"); 56621adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 56721adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 56821adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 56921adbd5cSStefan Behrens break; 57021adbd5cSStefan Behrens case Opt_check_integrity: 57121adbd5cSStefan Behrens printk(KERN_INFO "btrfs: enabling check integrity\n"); 57221adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 57321adbd5cSStefan Behrens break; 57421adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 57521adbd5cSStefan Behrens intarg = 0; 57621adbd5cSStefan Behrens match_int(&args[0], &intarg); 57721adbd5cSStefan Behrens if (intarg) { 57821adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 57921adbd5cSStefan Behrens printk(KERN_INFO "btrfs:" 58021adbd5cSStefan Behrens " check_integrity_print_mask 0x%x\n", 58121adbd5cSStefan Behrens info->check_integrity_print_mask); 58221adbd5cSStefan Behrens } 58321adbd5cSStefan Behrens break; 58421adbd5cSStefan Behrens #else 58521adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 58621adbd5cSStefan Behrens case Opt_check_integrity: 58721adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 58821adbd5cSStefan Behrens printk(KERN_ERR "btrfs: support for check_integrity*" 58921adbd5cSStefan Behrens " not compiled in!\n"); 59021adbd5cSStefan Behrens ret = -EINVAL; 59121adbd5cSStefan Behrens goto out; 59221adbd5cSStefan Behrens #endif 5938c342930SJeff Mahoney case Opt_fatal_errors: 5948c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 5958c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 5968c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 5978c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 5988c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 5998c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 6008c342930SJeff Mahoney else { 6018c342930SJeff Mahoney ret = -EINVAL; 6028c342930SJeff Mahoney goto out; 6038c342930SJeff Mahoney } 6048c342930SJeff Mahoney break; 605a7a3f7caSSage Weil case Opt_err: 606a7a3f7caSSage Weil printk(KERN_INFO "btrfs: unrecognized mount option " 607a7a3f7caSSage Weil "'%s'\n", p); 608a7a3f7caSSage Weil ret = -EINVAL; 609a7a3f7caSSage Weil goto out; 61095e05289SChris Mason default: 611be20aa9dSChris Mason break; 61295e05289SChris Mason } 61395e05289SChris Mason } 614a7a3f7caSSage Weil out: 61573bc1876SJosef Bacik if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 61673bc1876SJosef Bacik printk(KERN_INFO "btrfs: disk space caching is enabled\n"); 617da495eccSJosef Bacik kfree(orig); 618a7a3f7caSSage Weil return ret; 619edf24abeSChristoph Hellwig } 620edf24abeSChristoph Hellwig 621edf24abeSChristoph Hellwig /* 622edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 623edf24abeSChristoph Hellwig * 624edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 625edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 626edf24abeSChristoph Hellwig */ 62797288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 62873f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 629e15d0542SXin Zhong u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) 630edf24abeSChristoph Hellwig { 631edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 63283c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 633edf24abeSChristoph Hellwig int error = 0; 63473f73415SJosef Bacik int intarg; 635edf24abeSChristoph Hellwig 636edf24abeSChristoph Hellwig if (!options) 637830c4adbSJosef Bacik return 0; 638edf24abeSChristoph Hellwig 639edf24abeSChristoph Hellwig /* 640edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 641edf24abeSChristoph Hellwig * gets called twice 642edf24abeSChristoph Hellwig */ 643edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 644edf24abeSChristoph Hellwig if (!opts) 645edf24abeSChristoph Hellwig return -ENOMEM; 6463f3d0bc0STero Roponen orig = opts; 647edf24abeSChristoph Hellwig 648edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 649edf24abeSChristoph Hellwig int token; 650edf24abeSChristoph Hellwig if (!*p) 651edf24abeSChristoph Hellwig continue; 652edf24abeSChristoph Hellwig 653edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 654edf24abeSChristoph Hellwig switch (token) { 655edf24abeSChristoph Hellwig case Opt_subvol: 656a90e8b6fSIlya Dryomov kfree(*subvol_name); 657edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 658edf24abeSChristoph Hellwig break; 65973f73415SJosef Bacik case Opt_subvolid: 66073f73415SJosef Bacik intarg = 0; 6614849f01dSJosef Bacik error = match_int(&args[0], &intarg); 6624849f01dSJosef Bacik if (!error) { 6634849f01dSJosef Bacik /* we want the original fs_tree */ 6644849f01dSJosef Bacik if (!intarg) 6654849f01dSJosef Bacik *subvol_objectid = 6664849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 6674849f01dSJosef Bacik else 66873f73415SJosef Bacik *subvol_objectid = intarg; 6694849f01dSJosef Bacik } 67073f73415SJosef Bacik break; 671e15d0542SXin Zhong case Opt_subvolrootid: 672e15d0542SXin Zhong intarg = 0; 673e15d0542SXin Zhong error = match_int(&args[0], &intarg); 674e15d0542SXin Zhong if (!error) { 675e15d0542SXin Zhong /* we want the original fs_tree */ 676e15d0542SXin Zhong if (!intarg) 677e15d0542SXin Zhong *subvol_rootid = 678e15d0542SXin Zhong BTRFS_FS_TREE_OBJECTID; 679e15d0542SXin Zhong else 680e15d0542SXin Zhong *subvol_rootid = intarg; 681e15d0542SXin Zhong } 682e15d0542SXin Zhong break; 68343e570b0SChristoph Hellwig case Opt_device: 68483c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 68583c8c9bdSJeff Liu if (!device_name) { 68683c8c9bdSJeff Liu error = -ENOMEM; 68783c8c9bdSJeff Liu goto out; 68883c8c9bdSJeff Liu } 68983c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 69043e570b0SChristoph Hellwig flags, holder, fs_devices); 69183c8c9bdSJeff Liu kfree(device_name); 69243e570b0SChristoph Hellwig if (error) 693830c4adbSJosef Bacik goto out; 69443e570b0SChristoph Hellwig break; 695edf24abeSChristoph Hellwig default: 696edf24abeSChristoph Hellwig break; 697edf24abeSChristoph Hellwig } 698edf24abeSChristoph Hellwig } 699edf24abeSChristoph Hellwig 700edf24abeSChristoph Hellwig out: 701830c4adbSJosef Bacik kfree(orig); 702edf24abeSChristoph Hellwig return error; 70395e05289SChris Mason } 70495e05289SChris Mason 70573f73415SJosef Bacik static struct dentry *get_default_root(struct super_block *sb, 70673f73415SJosef Bacik u64 subvol_objectid) 70773f73415SJosef Bacik { 708815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 709815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 71073f73415SJosef Bacik struct btrfs_root *new_root; 71173f73415SJosef Bacik struct btrfs_dir_item *di; 71273f73415SJosef Bacik struct btrfs_path *path; 71373f73415SJosef Bacik struct btrfs_key location; 71473f73415SJosef Bacik struct inode *inode; 71573f73415SJosef Bacik u64 dir_id; 71673f73415SJosef Bacik int new = 0; 71773f73415SJosef Bacik 71873f73415SJosef Bacik /* 71973f73415SJosef Bacik * We have a specific subvol we want to mount, just setup location and 72073f73415SJosef Bacik * go look up the root. 72173f73415SJosef Bacik */ 72273f73415SJosef Bacik if (subvol_objectid) { 72373f73415SJosef Bacik location.objectid = subvol_objectid; 72473f73415SJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 72573f73415SJosef Bacik location.offset = (u64)-1; 72673f73415SJosef Bacik goto find_root; 72773f73415SJosef Bacik } 72873f73415SJosef Bacik 72973f73415SJosef Bacik path = btrfs_alloc_path(); 73073f73415SJosef Bacik if (!path) 73173f73415SJosef Bacik return ERR_PTR(-ENOMEM); 73273f73415SJosef Bacik path->leave_spinning = 1; 73373f73415SJosef Bacik 73473f73415SJosef Bacik /* 73573f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 73673f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 73773f73415SJosef Bacik * to mount. 73873f73415SJosef Bacik */ 739815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 74073f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 741b0839166SJulia Lawall if (IS_ERR(di)) { 742b0839166SJulia Lawall btrfs_free_path(path); 743fb4f6f91SDan Carpenter return ERR_CAST(di); 744b0839166SJulia Lawall } 74573f73415SJosef Bacik if (!di) { 74673f73415SJosef Bacik /* 74773f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 74873f73415SJosef Bacik * it's always been there, but don't freak out, just try and 74973f73415SJosef Bacik * mount to root most subvolume. 75073f73415SJosef Bacik */ 75173f73415SJosef Bacik btrfs_free_path(path); 75273f73415SJosef Bacik dir_id = BTRFS_FIRST_FREE_OBJECTID; 753815745cfSAl Viro new_root = fs_info->fs_root; 75473f73415SJosef Bacik goto setup_root; 75573f73415SJosef Bacik } 75673f73415SJosef Bacik 75773f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 75873f73415SJosef Bacik btrfs_free_path(path); 75973f73415SJosef Bacik 76073f73415SJosef Bacik find_root: 761815745cfSAl Viro new_root = btrfs_read_fs_root_no_name(fs_info, &location); 76273f73415SJosef Bacik if (IS_ERR(new_root)) 763d0b678cbSJulia Lawall return ERR_CAST(new_root); 76473f73415SJosef Bacik 76573f73415SJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 76673f73415SJosef Bacik return ERR_PTR(-ENOENT); 76773f73415SJosef Bacik 76873f73415SJosef Bacik dir_id = btrfs_root_dirid(&new_root->root_item); 76973f73415SJosef Bacik setup_root: 77073f73415SJosef Bacik location.objectid = dir_id; 77173f73415SJosef Bacik location.type = BTRFS_INODE_ITEM_KEY; 77273f73415SJosef Bacik location.offset = 0; 77373f73415SJosef Bacik 77473f73415SJosef Bacik inode = btrfs_iget(sb, &location, new_root, &new); 7754cbd1149SDan Carpenter if (IS_ERR(inode)) 7764cbd1149SDan Carpenter return ERR_CAST(inode); 77773f73415SJosef Bacik 77873f73415SJosef Bacik /* 77973f73415SJosef Bacik * If we're just mounting the root most subvol put the inode and return 78073f73415SJosef Bacik * a reference to the dentry. We will have already gotten a reference 78173f73415SJosef Bacik * to the inode in btrfs_fill_super so we're good to go. 78273f73415SJosef Bacik */ 78373f73415SJosef Bacik if (!new && sb->s_root->d_inode == inode) { 78473f73415SJosef Bacik iput(inode); 78573f73415SJosef Bacik return dget(sb->s_root); 78673f73415SJosef Bacik } 78773f73415SJosef Bacik 788ba5b8958SJosef Bacik return d_obtain_alias(inode); 78973f73415SJosef Bacik } 79073f73415SJosef Bacik 7918a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 7928a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 7938a4b83ccSChris Mason void *data, int silent) 7942e635a27SChris Mason { 7952e635a27SChris Mason struct inode *inode; 796815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 7975d4f98a2SYan Zheng struct btrfs_key key; 79839279cc3SChris Mason int err; 7992e635a27SChris Mason 8002e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 8012e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 802e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 803af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 804be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 8055103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 8062e635a27SChris Mason sb->s_time_gran = 1; 8070eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 80833268eafSJosef Bacik sb->s_flags |= MS_POSIXACL; 80949cf6f45SChris Ball #endif 8100c4d2d95SJosef Bacik sb->s_flags |= MS_I_VERSION; 811ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 812ad2b2c80SAl Viro if (err) { 813e20d96d6SChris Mason printk("btrfs: open_ctree failed\n"); 814ad2b2c80SAl Viro return err; 815e20d96d6SChris Mason } 816b888db2bSChris Mason 8175d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 8185d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 8195d4f98a2SYan Zheng key.offset = 0; 82098c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 8215d4f98a2SYan Zheng if (IS_ERR(inode)) { 8225d4f98a2SYan Zheng err = PTR_ERR(inode); 82339279cc3SChris Mason goto fail_close; 82439279cc3SChris Mason } 8252e635a27SChris Mason 82648fde701SAl Viro sb->s_root = d_make_root(inode); 82748fde701SAl Viro if (!sb->s_root) { 82839279cc3SChris Mason err = -ENOMEM; 82939279cc3SChris Mason goto fail_close; 8302e635a27SChris Mason } 83158176a96SJosef Bacik 8326885f308SChris Mason save_mount_options(sb, data); 83390a887c9SDan Magenheimer cleancache_init_fs(sb); 83459553edfSAl Viro sb->s_flags |= MS_ACTIVE; 8352e635a27SChris Mason return 0; 8362e635a27SChris Mason 83739279cc3SChris Mason fail_close: 838815745cfSAl Viro close_ctree(fs_info->tree_root); 839d5719762SChris Mason return err; 840d5719762SChris Mason } 841d5719762SChris Mason 8426bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 843d5719762SChris Mason { 844d5719762SChris Mason struct btrfs_trans_handle *trans; 845815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 846815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 847df2ce34cSChris Mason 8481abe9b8aSliubo trace_btrfs_sync_fs(wait); 8491abe9b8aSliubo 850d561c025SChris Mason if (!wait) { 851815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 852df2ce34cSChris Mason return 0; 853d561c025SChris Mason } 854771ed689SChris Mason 855*6bbe3a9cSLiu Bo btrfs_wait_ordered_extents(root, 0); 856771ed689SChris Mason 85760376ce4SJosef Bacik trans = btrfs_join_transaction_freeze(root); 85860376ce4SJosef Bacik if (IS_ERR(trans)) { 85960376ce4SJosef Bacik /* Frozen, don't bother */ 86060376ce4SJosef Bacik if (PTR_ERR(trans) == -EPERM) 861bd7de2c9SJosef Bacik return 0; 86298d5dc13STsutomu Itoh return PTR_ERR(trans); 86360376ce4SJosef Bacik } 864bd7de2c9SJosef Bacik return btrfs_commit_transaction(trans, root); 865d5719762SChris Mason } 866d5719762SChris Mason 86734c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 868a9572a15SEric Paris { 869815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 870815745cfSAl Viro struct btrfs_root *root = info->tree_root; 871200da64eSTsutomu Itoh char *compress_type; 872a9572a15SEric Paris 873a9572a15SEric Paris if (btrfs_test_opt(root, DEGRADED)) 874a9572a15SEric Paris seq_puts(seq, ",degraded"); 875a9572a15SEric Paris if (btrfs_test_opt(root, NODATASUM)) 876a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 877a9572a15SEric Paris if (btrfs_test_opt(root, NODATACOW)) 878a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 879a9572a15SEric Paris if (btrfs_test_opt(root, NOBARRIER)) 880a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 881a9572a15SEric Paris if (info->max_inline != 8192 * 1024) 88221380931SJoel Becker seq_printf(seq, ",max_inline=%llu", 88321380931SJoel Becker (unsigned long long)info->max_inline); 884a9572a15SEric Paris if (info->alloc_start != 0) 88521380931SJoel Becker seq_printf(seq, ",alloc_start=%llu", 88621380931SJoel Becker (unsigned long long)info->alloc_start); 887a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 888a9572a15SEric Paris num_online_cpus() + 2, 8)) 889a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 890200da64eSTsutomu Itoh if (btrfs_test_opt(root, COMPRESS)) { 891200da64eSTsutomu Itoh if (info->compress_type == BTRFS_COMPRESS_ZLIB) 892200da64eSTsutomu Itoh compress_type = "zlib"; 893200da64eSTsutomu Itoh else 894200da64eSTsutomu Itoh compress_type = "lzo"; 895200da64eSTsutomu Itoh if (btrfs_test_opt(root, FORCE_COMPRESS)) 896200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 897200da64eSTsutomu Itoh else 898200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 899200da64eSTsutomu Itoh } 900c289811cSChris Mason if (btrfs_test_opt(root, NOSSD)) 901c289811cSChris Mason seq_puts(seq, ",nossd"); 902451d7585SChris Mason if (btrfs_test_opt(root, SSD_SPREAD)) 903451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 904451d7585SChris Mason else if (btrfs_test_opt(root, SSD)) 905a9572a15SEric Paris seq_puts(seq, ",ssd"); 9063a5e1404SSage Weil if (btrfs_test_opt(root, NOTREELOG)) 9076b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 908dccae999SSage Weil if (btrfs_test_opt(root, FLUSHONCOMMIT)) 9096b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 91020a5239aSMatthew Wilcox if (btrfs_test_opt(root, DISCARD)) 91120a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 912a9572a15SEric Paris if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 913a9572a15SEric Paris seq_puts(seq, ",noacl"); 914200da64eSTsutomu Itoh if (btrfs_test_opt(root, SPACE_CACHE)) 915200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 91673bc1876SJosef Bacik else 9178965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 918200da64eSTsutomu Itoh if (btrfs_test_opt(root, CLEAR_CACHE)) 919200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 920200da64eSTsutomu Itoh if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 921200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 9220942caa3SDavid Sterba if (btrfs_test_opt(root, ENOSPC_DEBUG)) 9230942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 9240942caa3SDavid Sterba if (btrfs_test_opt(root, AUTO_DEFRAG)) 9250942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 9260942caa3SDavid Sterba if (btrfs_test_opt(root, INODE_MAP_CACHE)) 9270942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 9289555c6c1SIlya Dryomov if (btrfs_test_opt(root, SKIP_BALANCE)) 9299555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 9308c342930SJeff Mahoney if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 9318c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 932a9572a15SEric Paris return 0; 933a9572a15SEric Paris } 934a9572a15SEric Paris 935a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 9362e635a27SChris Mason { 937815745cfSAl Viro struct btrfs_fs_info *p = data; 938815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 9394b82d6e4SYan 940815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 9414b82d6e4SYan } 9424b82d6e4SYan 943450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 944450ba0eaSJosef Bacik { 9456de1d09dSAl Viro int err = set_anon_super(s, data); 9466de1d09dSAl Viro if (!err) 947450ba0eaSJosef Bacik s->s_fs_info = data; 9486de1d09dSAl Viro return err; 949450ba0eaSJosef Bacik } 950450ba0eaSJosef Bacik 951830c4adbSJosef Bacik /* 952f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 953f9d9ef62SDavid Sterba */ 954f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 955f9d9ef62SDavid Sterba { 956f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 957f9d9ef62SDavid Sterba return 1; 958f9d9ef62SDavid Sterba return 0; 959f9d9ef62SDavid Sterba } 960f9d9ef62SDavid Sterba 961f9d9ef62SDavid Sterba /* 962830c4adbSJosef Bacik * This will strip out the subvol=%s argument for an argument string and add 963830c4adbSJosef Bacik * subvolid=0 to make sure we get the actual tree root for path walking to the 964830c4adbSJosef Bacik * subvol we want. 965830c4adbSJosef Bacik */ 966830c4adbSJosef Bacik static char *setup_root_args(char *args) 967830c4adbSJosef Bacik { 968f60d16a8SJim Meyering unsigned len = strlen(args) + 2 + 1; 969f60d16a8SJim Meyering char *src, *dst, *buf; 970830c4adbSJosef Bacik 971830c4adbSJosef Bacik /* 972f60d16a8SJim Meyering * We need the same args as before, but with this substitution: 973f60d16a8SJim Meyering * s!subvol=[^,]+!subvolid=0! 974830c4adbSJosef Bacik * 975f60d16a8SJim Meyering * Since the replacement string is up to 2 bytes longer than the 976f60d16a8SJim Meyering * original, allocate strlen(args) + 2 + 1 bytes. 977830c4adbSJosef Bacik */ 978830c4adbSJosef Bacik 979f60d16a8SJim Meyering src = strstr(args, "subvol="); 980830c4adbSJosef Bacik /* This shouldn't happen, but just in case.. */ 981f60d16a8SJim Meyering if (!src) 982830c4adbSJosef Bacik return NULL; 983f60d16a8SJim Meyering 984f60d16a8SJim Meyering buf = dst = kmalloc(len, GFP_NOFS); 985f60d16a8SJim Meyering if (!buf) 986f60d16a8SJim Meyering return NULL; 987830c4adbSJosef Bacik 988830c4adbSJosef Bacik /* 989f60d16a8SJim Meyering * If the subvol= arg is not at the start of the string, 990f60d16a8SJim Meyering * copy whatever precedes it into buf. 991830c4adbSJosef Bacik */ 992f60d16a8SJim Meyering if (src != args) { 993f60d16a8SJim Meyering *src++ = '\0'; 994f60d16a8SJim Meyering strcpy(buf, args); 995f60d16a8SJim Meyering dst += strlen(args); 996830c4adbSJosef Bacik } 997830c4adbSJosef Bacik 998f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 999f60d16a8SJim Meyering dst += strlen("subvolid=0"); 1000830c4adbSJosef Bacik 1001830c4adbSJosef Bacik /* 1002f60d16a8SJim Meyering * If there is a "," after the original subvol=... string, 1003f60d16a8SJim Meyering * copy that suffix into our buffer. Otherwise, we're done. 1004830c4adbSJosef Bacik */ 1005f60d16a8SJim Meyering src = strchr(src, ','); 1006f60d16a8SJim Meyering if (src) 1007f60d16a8SJim Meyering strcpy(dst, src); 1008830c4adbSJosef Bacik 1009f60d16a8SJim Meyering return buf; 1010830c4adbSJosef Bacik } 1011830c4adbSJosef Bacik 1012830c4adbSJosef Bacik static struct dentry *mount_subvol(const char *subvol_name, int flags, 1013830c4adbSJosef Bacik const char *device_name, char *data) 1014830c4adbSJosef Bacik { 1015830c4adbSJosef Bacik struct dentry *root; 1016830c4adbSJosef Bacik struct vfsmount *mnt; 1017830c4adbSJosef Bacik char *newargs; 1018830c4adbSJosef Bacik 1019830c4adbSJosef Bacik newargs = setup_root_args(data); 1020830c4adbSJosef Bacik if (!newargs) 1021830c4adbSJosef Bacik return ERR_PTR(-ENOMEM); 1022830c4adbSJosef Bacik mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, 1023830c4adbSJosef Bacik newargs); 1024830c4adbSJosef Bacik kfree(newargs); 1025830c4adbSJosef Bacik if (IS_ERR(mnt)) 1026830c4adbSJosef Bacik return ERR_CAST(mnt); 1027830c4adbSJosef Bacik 1028ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1029830c4adbSJosef Bacik 1030ea441d11SAl Viro if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { 1031ea441d11SAl Viro struct super_block *s = root->d_sb; 1032ea441d11SAl Viro dput(root); 1033ea441d11SAl Viro root = ERR_PTR(-EINVAL); 1034ea441d11SAl Viro deactivate_locked_super(s); 1035f9d9ef62SDavid Sterba printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", 1036f9d9ef62SDavid Sterba subvol_name); 1037f9d9ef62SDavid Sterba } 1038f9d9ef62SDavid Sterba 1039830c4adbSJosef Bacik return root; 1040830c4adbSJosef Bacik } 1041450ba0eaSJosef Bacik 1042edf24abeSChristoph Hellwig /* 1043edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1044edf24abeSChristoph Hellwig * 1045edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1046edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1047edf24abeSChristoph Hellwig */ 1048061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1049306e16ceSDavid Sterba const char *device_name, void *data) 10504b82d6e4SYan { 10514b82d6e4SYan struct block_device *bdev = NULL; 10524b82d6e4SYan struct super_block *s; 10534b82d6e4SYan struct dentry *root; 10548a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1055450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 105697288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 105773f73415SJosef Bacik char *subvol_name = NULL; 105873f73415SJosef Bacik u64 subvol_objectid = 0; 1059e15d0542SXin Zhong u64 subvol_rootid = 0; 10604b82d6e4SYan int error = 0; 10614b82d6e4SYan 106297288f2cSChristoph Hellwig if (!(flags & MS_RDONLY)) 106397288f2cSChristoph Hellwig mode |= FMODE_WRITE; 106497288f2cSChristoph Hellwig 106597288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 106673f73415SJosef Bacik &subvol_name, &subvol_objectid, 1067e15d0542SXin Zhong &subvol_rootid, &fs_devices); 1068f23c8af8SIlya Dryomov if (error) { 1069f23c8af8SIlya Dryomov kfree(subvol_name); 1070061dbc6bSAl Viro return ERR_PTR(error); 1071f23c8af8SIlya Dryomov } 1072edf24abeSChristoph Hellwig 1073830c4adbSJosef Bacik if (subvol_name) { 1074830c4adbSJosef Bacik root = mount_subvol(subvol_name, flags, device_name, data); 1075830c4adbSJosef Bacik kfree(subvol_name); 1076830c4adbSJosef Bacik return root; 1077830c4adbSJosef Bacik } 1078830c4adbSJosef Bacik 1079306e16ceSDavid Sterba error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 10808a4b83ccSChris Mason if (error) 1081830c4adbSJosef Bacik return ERR_PTR(error); 10824b82d6e4SYan 1083450ba0eaSJosef Bacik /* 1084450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1085450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1086450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1087450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1088450ba0eaSJosef Bacik */ 1089450ba0eaSJosef Bacik fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 109004d21a24SIlya Dryomov if (!fs_info) 109104d21a24SIlya Dryomov return ERR_PTR(-ENOMEM); 109204d21a24SIlya Dryomov 1093450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1094450ba0eaSJosef Bacik 10956c41761fSDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 10966c41761fSDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 10976c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 10986c41761fSDavid Sterba error = -ENOMEM; 109904d21a24SIlya Dryomov goto error_fs_info; 110004d21a24SIlya Dryomov } 110104d21a24SIlya Dryomov 110204d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 110304d21a24SIlya Dryomov if (error) 110404d21a24SIlya Dryomov goto error_fs_info; 110504d21a24SIlya Dryomov 110604d21a24SIlya Dryomov if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 110704d21a24SIlya Dryomov error = -EACCES; 11086c41761fSDavid Sterba goto error_close_devices; 11096c41761fSDavid Sterba } 11106c41761fSDavid Sterba 1111dfe25020SChris Mason bdev = fs_devices->latest_bdev; 11129249e17fSDavid Howells s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 11139249e17fSDavid Howells fs_info); 1114830c4adbSJosef Bacik if (IS_ERR(s)) { 1115830c4adbSJosef Bacik error = PTR_ERR(s); 1116830c4adbSJosef Bacik goto error_close_devices; 1117830c4adbSJosef Bacik } 11184b82d6e4SYan 11194b82d6e4SYan if (s->s_root) { 11202b82032cSYan Zheng btrfs_close_devices(fs_devices); 11216c41761fSDavid Sterba free_fs_info(fs_info); 112259553edfSAl Viro if ((flags ^ s->s_flags) & MS_RDONLY) 112359553edfSAl Viro error = -EBUSY; 11244b82d6e4SYan } else { 11254b82d6e4SYan char b[BDEVNAME_SIZE]; 11264b82d6e4SYan 11274b82d6e4SYan strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1128815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 11298a4b83ccSChris Mason error = btrfs_fill_super(s, fs_devices, data, 11308a4b83ccSChris Mason flags & MS_SILENT ? 1 : 0); 11314b82d6e4SYan } 11324b82d6e4SYan 113359553edfSAl Viro root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); 113459553edfSAl Viro if (IS_ERR(root)) 1135e15d0542SXin Zhong deactivate_locked_super(s); 11364b82d6e4SYan 1137061dbc6bSAl Viro return root; 11384b82d6e4SYan 1139c146afadSYan Zheng error_close_devices: 11408a4b83ccSChris Mason btrfs_close_devices(fs_devices); 114104d21a24SIlya Dryomov error_fs_info: 11426c41761fSDavid Sterba free_fs_info(fs_info); 1143061dbc6bSAl Viro return ERR_PTR(error); 11444b82d6e4SYan } 11452e635a27SChris Mason 11460d2450abSSergei Trofimovich static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) 11470d2450abSSergei Trofimovich { 11480d2450abSSergei Trofimovich spin_lock_irq(&workers->lock); 11490d2450abSSergei Trofimovich workers->max_workers = new_limit; 11500d2450abSSergei Trofimovich spin_unlock_irq(&workers->lock); 11510d2450abSSergei Trofimovich } 11520d2450abSSergei Trofimovich 11530d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 11540d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 11550d2450abSSergei Trofimovich { 11560d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 11570d2450abSSergei Trofimovich return; 11580d2450abSSergei Trofimovich 11590d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 11600d2450abSSergei Trofimovich 11610d2450abSSergei Trofimovich printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", 11620d2450abSSergei Trofimovich old_pool_size, new_pool_size); 11630d2450abSSergei Trofimovich 11640d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); 11650d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->workers, new_pool_size); 11660d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); 11670d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); 11680d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); 11690d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); 11700d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); 11710d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); 11720d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); 11730d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); 11740d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); 11750d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); 11760d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); 11770d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->scrub_workers, new_pool_size); 11780d2450abSSergei Trofimovich } 11790d2450abSSergei Trofimovich 1180c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1181c146afadSYan Zheng { 1182815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1183815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 118449b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 118549b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 118649b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 118749b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 118849b25e05SJeff Mahoney u64 old_alloc_start = fs_info->alloc_start; 118949b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 119049b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1191c146afadSYan Zheng int ret; 1192c146afadSYan Zheng 1193b288052eSChris Mason ret = btrfs_parse_options(root, data); 119449b25e05SJeff Mahoney if (ret) { 119549b25e05SJeff Mahoney ret = -EINVAL; 119649b25e05SJeff Mahoney goto restore; 119749b25e05SJeff Mahoney } 1198b288052eSChris Mason 11990d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 12000d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 12010d2450abSSergei Trofimovich 1202c146afadSYan Zheng if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1203c146afadSYan Zheng return 0; 1204c146afadSYan Zheng 1205c146afadSYan Zheng if (*flags & MS_RDONLY) { 1206c146afadSYan Zheng sb->s_flags |= MS_RDONLY; 1207c146afadSYan Zheng 1208c146afadSYan Zheng ret = btrfs_commit_super(root); 120949b25e05SJeff Mahoney if (ret) 121049b25e05SJeff Mahoney goto restore; 1211c146afadSYan Zheng } else { 12128a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 121349b25e05SJeff Mahoney ret = -EACCES; 121449b25e05SJeff Mahoney goto restore; 12158a3db184SSergei Trofimovich } 12162b82032cSYan Zheng 12178a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 121849b25e05SJeff Mahoney ret = -EINVAL; 121949b25e05SJeff Mahoney goto restore; 12208a3db184SSergei Trofimovich } 1221c146afadSYan Zheng 1222815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 122349b25e05SJeff Mahoney if (ret) 122449b25e05SJeff Mahoney goto restore; 1225c146afadSYan Zheng 1226d68fc57bSYan, Zheng /* recover relocation */ 1227d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 122849b25e05SJeff Mahoney if (ret) 122949b25e05SJeff Mahoney goto restore; 1230c146afadSYan Zheng 12312b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 12322b6ba629SIlya Dryomov if (ret) 12332b6ba629SIlya Dryomov goto restore; 12342b6ba629SIlya Dryomov 1235c146afadSYan Zheng sb->s_flags &= ~MS_RDONLY; 1236c146afadSYan Zheng } 1237c146afadSYan Zheng 1238c146afadSYan Zheng return 0; 123949b25e05SJeff Mahoney 124049b25e05SJeff Mahoney restore: 124149b25e05SJeff Mahoney /* We've hit an error - don't reset MS_RDONLY */ 124249b25e05SJeff Mahoney if (sb->s_flags & MS_RDONLY) 124349b25e05SJeff Mahoney old_flags |= MS_RDONLY; 124449b25e05SJeff Mahoney sb->s_flags = old_flags; 124549b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 124649b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 124749b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 124849b25e05SJeff Mahoney fs_info->alloc_start = old_alloc_start; 12490d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 12500d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 125149b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 125249b25e05SJeff Mahoney return ret; 1253c146afadSYan Zheng } 1254c146afadSYan Zheng 1255bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1256bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1257bcd53741SArne Jansen const void *dev_info2) 1258bcd53741SArne Jansen { 1259bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1260bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1261bcd53741SArne Jansen return -1; 1262bcd53741SArne Jansen else if (((struct btrfs_device_info *)dev_info1)->max_avail < 1263bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1264bcd53741SArne Jansen return 1; 1265bcd53741SArne Jansen else 1266bcd53741SArne Jansen return 0; 1267bcd53741SArne Jansen } 1268bcd53741SArne Jansen 1269bcd53741SArne Jansen /* 1270bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1271bcd53741SArne Jansen * is stored.(Descending Sort) 1272bcd53741SArne Jansen */ 1273bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1274bcd53741SArne Jansen struct btrfs_device_info *devices, 1275bcd53741SArne Jansen size_t nr_devices) 1276bcd53741SArne Jansen { 1277bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1278bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1279bcd53741SArne Jansen } 1280bcd53741SArne Jansen 12816d07bcecSMiao Xie /* 12826d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 12836d07bcecSMiao Xie * file data. 12846d07bcecSMiao Xie */ 12856d07bcecSMiao Xie static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 12866d07bcecSMiao Xie { 12876d07bcecSMiao Xie struct btrfs_fs_info *fs_info = root->fs_info; 12886d07bcecSMiao Xie struct btrfs_device_info *devices_info; 12896d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 12906d07bcecSMiao Xie struct btrfs_device *device; 12916d07bcecSMiao Xie u64 skip_space; 12926d07bcecSMiao Xie u64 type; 12936d07bcecSMiao Xie u64 avail_space; 12946d07bcecSMiao Xie u64 used_space; 12956d07bcecSMiao Xie u64 min_stripe_size; 129639fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 12976d07bcecSMiao Xie int i = 0, nr_devices; 12986d07bcecSMiao Xie int ret; 12996d07bcecSMiao Xie 1300b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 13016d07bcecSMiao Xie BUG_ON(!nr_devices); 13026d07bcecSMiao Xie 13036d07bcecSMiao Xie devices_info = kmalloc(sizeof(*devices_info) * nr_devices, 13046d07bcecSMiao Xie GFP_NOFS); 13056d07bcecSMiao Xie if (!devices_info) 13066d07bcecSMiao Xie return -ENOMEM; 13076d07bcecSMiao Xie 13086d07bcecSMiao Xie /* calc min stripe number for data space alloction */ 13096d07bcecSMiao Xie type = btrfs_get_alloc_profile(root, 1); 131039fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 13116d07bcecSMiao Xie min_stripes = 2; 131239fb26c3SMiao Xie num_stripes = nr_devices; 131339fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 13146d07bcecSMiao Xie min_stripes = 2; 131539fb26c3SMiao Xie num_stripes = 2; 131639fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 13176d07bcecSMiao Xie min_stripes = 4; 131839fb26c3SMiao Xie num_stripes = 4; 131939fb26c3SMiao Xie } 13206d07bcecSMiao Xie 13216d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 13226d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 13236d07bcecSMiao Xie else 13246d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 13256d07bcecSMiao Xie 1326b772a86eSLi Zefan list_for_each_entry(device, &fs_devices->devices, dev_list) { 1327b772a86eSLi Zefan if (!device->in_fs_metadata || !device->bdev) 13286d07bcecSMiao Xie continue; 13296d07bcecSMiao Xie 13306d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 13316d07bcecSMiao Xie 13326d07bcecSMiao Xie /* align with stripe_len */ 13336d07bcecSMiao Xie do_div(avail_space, BTRFS_STRIPE_LEN); 13346d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 13356d07bcecSMiao Xie 13366d07bcecSMiao Xie /* 13376d07bcecSMiao Xie * In order to avoid overwritting the superblock on the drive, 13386d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 13396d07bcecSMiao Xie * allocation. 13406d07bcecSMiao Xie */ 13416d07bcecSMiao Xie skip_space = 1024 * 1024; 13426d07bcecSMiao Xie 13436d07bcecSMiao Xie /* user can set the offset in fs_info->alloc_start. */ 13446d07bcecSMiao Xie if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= 13456d07bcecSMiao Xie device->total_bytes) 13466d07bcecSMiao Xie skip_space = max(fs_info->alloc_start, skip_space); 13476d07bcecSMiao Xie 13486d07bcecSMiao Xie /* 13496d07bcecSMiao Xie * btrfs can not use the free space in [0, skip_space - 1], 13506d07bcecSMiao Xie * we must subtract it from the total. In order to implement 13516d07bcecSMiao Xie * it, we account the used space in this range first. 13526d07bcecSMiao Xie */ 13536d07bcecSMiao Xie ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, 13546d07bcecSMiao Xie &used_space); 13556d07bcecSMiao Xie if (ret) { 13566d07bcecSMiao Xie kfree(devices_info); 13576d07bcecSMiao Xie return ret; 13586d07bcecSMiao Xie } 13596d07bcecSMiao Xie 13606d07bcecSMiao Xie /* calc the free space in [0, skip_space - 1] */ 13616d07bcecSMiao Xie skip_space -= used_space; 13626d07bcecSMiao Xie 13636d07bcecSMiao Xie /* 13646d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 13656d07bcecSMiao Xie * it from the total. 13666d07bcecSMiao Xie */ 13676d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 13686d07bcecSMiao Xie avail_space -= skip_space; 13696d07bcecSMiao Xie else 13706d07bcecSMiao Xie avail_space = 0; 13716d07bcecSMiao Xie 13726d07bcecSMiao Xie if (avail_space < min_stripe_size) 13736d07bcecSMiao Xie continue; 13746d07bcecSMiao Xie 13756d07bcecSMiao Xie devices_info[i].dev = device; 13766d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 13776d07bcecSMiao Xie 13786d07bcecSMiao Xie i++; 13796d07bcecSMiao Xie } 13806d07bcecSMiao Xie 13816d07bcecSMiao Xie nr_devices = i; 13826d07bcecSMiao Xie 13836d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 13846d07bcecSMiao Xie 13856d07bcecSMiao Xie i = nr_devices - 1; 13866d07bcecSMiao Xie avail_space = 0; 13876d07bcecSMiao Xie while (nr_devices >= min_stripes) { 138839fb26c3SMiao Xie if (num_stripes > nr_devices) 138939fb26c3SMiao Xie num_stripes = nr_devices; 139039fb26c3SMiao Xie 13916d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 13926d07bcecSMiao Xie int j; 13936d07bcecSMiao Xie u64 alloc_size; 13946d07bcecSMiao Xie 139539fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 13966d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 139739fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 13986d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 13996d07bcecSMiao Xie } 14006d07bcecSMiao Xie i--; 14016d07bcecSMiao Xie nr_devices--; 14026d07bcecSMiao Xie } 14036d07bcecSMiao Xie 14046d07bcecSMiao Xie kfree(devices_info); 14056d07bcecSMiao Xie *free_bytes = avail_space; 14066d07bcecSMiao Xie return 0; 14076d07bcecSMiao Xie } 14086d07bcecSMiao Xie 14098fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 14108fd17795SChris Mason { 1411815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 1412815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 1413815745cfSAl Viro struct list_head *head = &fs_info->space_info; 1414bd4d1088SJosef Bacik struct btrfs_space_info *found; 1415bd4d1088SJosef Bacik u64 total_used = 0; 14166d07bcecSMiao Xie u64 total_free_data = 0; 1417db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 1418815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 14196d07bcecSMiao Xie int ret; 14208fd17795SChris Mason 14216d07bcecSMiao Xie /* holding chunk_muext to avoid allocating new chunks */ 1422815745cfSAl Viro mutex_lock(&fs_info->chunk_mutex); 1423bd4d1088SJosef Bacik rcu_read_lock(); 142489a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 14256d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 14266d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 14276d07bcecSMiao Xie total_free_data -= 14286d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 14296d07bcecSMiao Xie } 14306d07bcecSMiao Xie 1431b742bb82SYan, Zheng total_used += found->disk_used; 143289a55897SJosef Bacik } 1433bd4d1088SJosef Bacik rcu_read_unlock(); 1434bd4d1088SJosef Bacik 14358fd17795SChris Mason buf->f_namelen = BTRFS_NAME_LEN; 1436db94535dSChris Mason buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; 1437bd4d1088SJosef Bacik buf->f_bfree = buf->f_blocks - (total_used >> bits); 14388fd17795SChris Mason buf->f_bsize = dentry->d_sb->s_blocksize; 14398fd17795SChris Mason buf->f_type = BTRFS_SUPER_MAGIC; 14406d07bcecSMiao Xie buf->f_bavail = total_free_data; 1441815745cfSAl Viro ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 14426d07bcecSMiao Xie if (ret) { 1443815745cfSAl Viro mutex_unlock(&fs_info->chunk_mutex); 14446d07bcecSMiao Xie return ret; 14456d07bcecSMiao Xie } 14466d07bcecSMiao Xie buf->f_bavail += total_free_data; 14476d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 1448815745cfSAl Viro mutex_unlock(&fs_info->chunk_mutex); 1449d397712bSChris Mason 14509d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 14519d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 14529d03632eSDavid Woodhouse on a big-endian or little-endian host */ 14539d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 14549d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 145532d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 145632d48fa1SDavid Woodhouse buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; 145732d48fa1SDavid Woodhouse buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; 145832d48fa1SDavid Woodhouse 14598fd17795SChris Mason return 0; 14608fd17795SChris Mason } 1461b5133862SChris Mason 1462aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 1463aea52e19SAl Viro { 1464815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1465aea52e19SAl Viro kill_anon_super(sb); 1466aea52e19SAl Viro free_fs_info(fs_info); 1467aea52e19SAl Viro } 1468aea52e19SAl Viro 14692e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 14702e635a27SChris Mason .owner = THIS_MODULE, 14712e635a27SChris Mason .name = "btrfs", 1472061dbc6bSAl Viro .mount = btrfs_mount, 1473aea52e19SAl Viro .kill_sb = btrfs_kill_super, 14742e635a27SChris Mason .fs_flags = FS_REQUIRES_DEV, 14752e635a27SChris Mason }; 1476a9218f6bSChris Mason 1477d352ac68SChris Mason /* 1478d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 1479d352ac68SChris Mason */ 14808a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 14818a4b83ccSChris Mason unsigned long arg) 14828a4b83ccSChris Mason { 14838a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 14848a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 1485c071fcfdSChris Mason int ret = -ENOTTY; 14868a4b83ccSChris Mason 1487e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1488e441d54dSChris Mason return -EPERM; 1489e441d54dSChris Mason 1490dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 1491dae7b665SLi Zefan if (IS_ERR(vol)) 1492dae7b665SLi Zefan return PTR_ERR(vol); 1493c071fcfdSChris Mason 14948a4b83ccSChris Mason switch (cmd) { 14958a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 149697288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 14978a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 14988a4b83ccSChris Mason break; 149902db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 150002db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 150102db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 150202db0844SJosef Bacik if (ret) 150302db0844SJosef Bacik break; 150402db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 150502db0844SJosef Bacik break; 15068a4b83ccSChris Mason } 1507dae7b665SLi Zefan 15088a4b83ccSChris Mason kfree(vol); 1509f819d837SLinda Knippers return ret; 15108a4b83ccSChris Mason } 15118a4b83ccSChris Mason 15120176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 1513ed0dab6bSYan { 1514815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1515815745cfSAl Viro mutex_lock(&fs_info->transaction_kthread_mutex); 1516815745cfSAl Viro mutex_lock(&fs_info->cleaner_mutex); 15170176260fSLinus Torvalds return 0; 1518ed0dab6bSYan } 1519ed0dab6bSYan 15200176260fSLinus Torvalds static int btrfs_unfreeze(struct super_block *sb) 1521ed0dab6bSYan { 1522815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1523815745cfSAl Viro mutex_unlock(&fs_info->cleaner_mutex); 1524815745cfSAl Viro mutex_unlock(&fs_info->transaction_kthread_mutex); 15250176260fSLinus Torvalds return 0; 1526ed0dab6bSYan } 15272e635a27SChris Mason 15289c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 15299c5085c1SJosef Bacik { 15309c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 15319c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 15329c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 15339c5085c1SJosef Bacik struct list_head *head; 15349c5085c1SJosef Bacik struct rcu_string *name; 15359c5085c1SJosef Bacik 15369c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 15379c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 15389c5085c1SJosef Bacik while (cur_devices) { 15399c5085c1SJosef Bacik head = &cur_devices->devices; 15409c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 1541aa9ddcd4SJosef Bacik if (dev->missing) 1542aa9ddcd4SJosef Bacik continue; 15439c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 15449c5085c1SJosef Bacik first_dev = dev; 15459c5085c1SJosef Bacik } 15469c5085c1SJosef Bacik cur_devices = cur_devices->seed; 15479c5085c1SJosef Bacik } 15489c5085c1SJosef Bacik 15499c5085c1SJosef Bacik if (first_dev) { 15509c5085c1SJosef Bacik rcu_read_lock(); 15519c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 15529c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 15539c5085c1SJosef Bacik rcu_read_unlock(); 15549c5085c1SJosef Bacik } else { 15559c5085c1SJosef Bacik WARN_ON(1); 15569c5085c1SJosef Bacik } 15579c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 15589c5085c1SJosef Bacik return 0; 15599c5085c1SJosef Bacik } 15609c5085c1SJosef Bacik 1561b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 156276dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 1563bd555975SAl Viro .evict_inode = btrfs_evict_inode, 1564e20d96d6SChris Mason .put_super = btrfs_put_super, 1565d5719762SChris Mason .sync_fs = btrfs_sync_fs, 1566a9572a15SEric Paris .show_options = btrfs_show_options, 15679c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 15684730a4bcSChris Mason .write_inode = btrfs_write_inode, 15692c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 15702c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 15718fd17795SChris Mason .statfs = btrfs_statfs, 1572c146afadSYan Zheng .remount_fs = btrfs_remount, 15730176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 15740176260fSLinus Torvalds .unfreeze_fs = btrfs_unfreeze, 1575e20d96d6SChris Mason }; 1576a9218f6bSChris Mason 1577a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 1578a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 1579a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 1580a9218f6bSChris Mason .owner = THIS_MODULE, 15816038f373SArnd Bergmann .llseek = noop_llseek, 1582a9218f6bSChris Mason }; 1583a9218f6bSChris Mason 1584a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 1585578454ffSKay Sievers .minor = BTRFS_MINOR, 1586a9218f6bSChris Mason .name = "btrfs-control", 1587a9218f6bSChris Mason .fops = &btrfs_ctl_fops 1588a9218f6bSChris Mason }; 1589a9218f6bSChris Mason 1590578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 1591578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 1592578454ffSKay Sievers 1593a9218f6bSChris Mason static int btrfs_interface_init(void) 1594a9218f6bSChris Mason { 1595a9218f6bSChris Mason return misc_register(&btrfs_misc); 1596a9218f6bSChris Mason } 1597a9218f6bSChris Mason 1598b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 1599a9218f6bSChris Mason { 1600a9218f6bSChris Mason if (misc_deregister(&btrfs_misc) < 0) 1601d397712bSChris Mason printk(KERN_INFO "misc_deregister failed for control device"); 1602a9218f6bSChris Mason } 1603a9218f6bSChris Mason 16042e635a27SChris Mason static int __init init_btrfs_fs(void) 16052e635a27SChris Mason { 16062c90e5d6SChris Mason int err; 160758176a96SJosef Bacik 160858176a96SJosef Bacik err = btrfs_init_sysfs(); 160958176a96SJosef Bacik if (err) 161058176a96SJosef Bacik return err; 161158176a96SJosef Bacik 1612143bede5SJeff Mahoney btrfs_init_compress(); 1613d1310b2eSChris Mason 1614261507a0SLi Zefan err = btrfs_init_cachep(); 1615261507a0SLi Zefan if (err) 1616261507a0SLi Zefan goto free_compress; 1617261507a0SLi Zefan 1618d1310b2eSChris Mason err = extent_io_init(); 16192f4cbe64SWyatt Banks if (err) 16202f4cbe64SWyatt Banks goto free_cachep; 16212f4cbe64SWyatt Banks 1622d1310b2eSChris Mason err = extent_map_init(); 1623d1310b2eSChris Mason if (err) 1624d1310b2eSChris Mason goto free_extent_io; 1625d1310b2eSChris Mason 16266352b91dSMiao Xie err = ordered_data_init(); 16272f4cbe64SWyatt Banks if (err) 16282f4cbe64SWyatt Banks goto free_extent_map; 1629c8b97818SChris Mason 16306352b91dSMiao Xie err = btrfs_delayed_inode_init(); 16316352b91dSMiao Xie if (err) 16326352b91dSMiao Xie goto free_ordered_data; 16336352b91dSMiao Xie 163416cdcec7SMiao Xie err = btrfs_interface_init(); 163516cdcec7SMiao Xie if (err) 163616cdcec7SMiao Xie goto free_delayed_inode; 163716cdcec7SMiao Xie 1638a9218f6bSChris Mason err = register_filesystem(&btrfs_fs_type); 1639a9218f6bSChris Mason if (err) 1640a9218f6bSChris Mason goto unregister_ioctl; 1641b3c3da71SChris Mason 1642e565d4b9SJan Schmidt btrfs_init_lockdep(); 1643e565d4b9SJan Schmidt 1644b3c3da71SChris Mason printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); 16452f4cbe64SWyatt Banks return 0; 16462f4cbe64SWyatt Banks 1647a9218f6bSChris Mason unregister_ioctl: 1648a9218f6bSChris Mason btrfs_interface_exit(); 164916cdcec7SMiao Xie free_delayed_inode: 165016cdcec7SMiao Xie btrfs_delayed_inode_exit(); 16516352b91dSMiao Xie free_ordered_data: 16526352b91dSMiao Xie ordered_data_exit(); 16532f4cbe64SWyatt Banks free_extent_map: 16542f4cbe64SWyatt Banks extent_map_exit(); 1655d1310b2eSChris Mason free_extent_io: 1656d1310b2eSChris Mason extent_io_exit(); 16572f4cbe64SWyatt Banks free_cachep: 16582f4cbe64SWyatt Banks btrfs_destroy_cachep(); 1659261507a0SLi Zefan free_compress: 1660261507a0SLi Zefan btrfs_exit_compress(); 16612f4cbe64SWyatt Banks btrfs_exit_sysfs(); 16622c90e5d6SChris Mason return err; 16632e635a27SChris Mason } 16642e635a27SChris Mason 16652e635a27SChris Mason static void __exit exit_btrfs_fs(void) 16662e635a27SChris Mason { 166739279cc3SChris Mason btrfs_destroy_cachep(); 166816cdcec7SMiao Xie btrfs_delayed_inode_exit(); 16696352b91dSMiao Xie ordered_data_exit(); 1670a52d9a80SChris Mason extent_map_exit(); 1671d1310b2eSChris Mason extent_io_exit(); 1672a9218f6bSChris Mason btrfs_interface_exit(); 16732e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 167458176a96SJosef Bacik btrfs_exit_sysfs(); 16758a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 1676261507a0SLi Zefan btrfs_exit_compress(); 16772e635a27SChris Mason } 16782e635a27SChris Mason 16792e635a27SChris Mason module_init(init_btrfs_fs) 16802e635a27SChris Mason module_exit(exit_btrfs_fs) 16812e635a27SChris Mason 16822e635a27SChris Mason MODULE_LICENSE("GPL"); 1683