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) { 25149b25e05SJeff Mahoney btrfs_printk(root->fs_info, "Aborting unused transaction.\n"); 25249b25e05SJeff Mahoney return; 25349b25e05SJeff Mahoney } 25449b25e05SJeff Mahoney trans->transaction->aborted = errno; 25549b25e05SJeff Mahoney __btrfs_std_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 */ 2618c342930SJeff Mahoney void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 2628c342930SJeff Mahoney unsigned int line, int errno, const char *fmt, ...) 2638c342930SJeff Mahoney { 2648c342930SJeff Mahoney char nbuf[16]; 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 2768c342930SJeff Mahoney errstr = btrfs_decode_error(fs_info, errno, nbuf); 2778c342930SJeff Mahoney if (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR) 2788c342930SJeff Mahoney panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", 2798c342930SJeff Mahoney s_id, function, line, &vaf, errstr); 2808c342930SJeff Mahoney 2818c342930SJeff Mahoney printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", 2828c342930SJeff Mahoney s_id, function, line, &vaf, errstr); 2838c342930SJeff Mahoney va_end(args); 2848c342930SJeff Mahoney /* Caller calls BUG() */ 2858c342930SJeff Mahoney } 286e20d96d6SChris Mason 287e20d96d6SChris Mason static void btrfs_put_super(struct super_block *sb) 288e20d96d6SChris Mason { 289815745cfSAl Viro (void)close_ctree(btrfs_sb(sb)->tree_root); 290aea52e19SAl Viro /* FIXME: need to fix VFS to return error? */ 291aea52e19SAl Viro /* AV: return it _where_? ->put_super() can be triggered by any number 292aea52e19SAl Viro * of async events, up to and including delivery of SIGKILL to the 293aea52e19SAl Viro * last process that kept it busy. Or segfault in the aforementioned 294aea52e19SAl Viro * process... Whom would you report that to? 295aea52e19SAl Viro */ 296e20d96d6SChris Mason } 2972e635a27SChris Mason 29895e05289SChris Mason enum { 29973f73415SJosef Bacik Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, 300287a0ab9SJosef Bacik Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, 301287a0ab9SJosef Bacik Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, 302261507a0SLi Zefan Opt_compress_type, Opt_compress_force, Opt_compress_force_type, 303261507a0SLi Zefan Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, 30491435650SChris Mason Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, 3059555c6c1SIlya Dryomov Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, 3069555c6c1SIlya Dryomov Opt_no_space_cache, Opt_recovery, Opt_skip_balance, 30721adbd5cSStefan Behrens Opt_check_integrity, Opt_check_integrity_including_extent_data, 3088c342930SJeff Mahoney Opt_check_integrity_print_mask, Opt_fatal_errors, 3099555c6c1SIlya Dryomov Opt_err, 31095e05289SChris Mason }; 31195e05289SChris Mason 31295e05289SChris Mason static match_table_t tokens = { 313dfe25020SChris Mason {Opt_degraded, "degraded"}, 31495e05289SChris Mason {Opt_subvol, "subvol=%s"}, 31573f73415SJosef Bacik {Opt_subvolid, "subvolid=%d"}, 31643e570b0SChristoph Hellwig {Opt_device, "device=%s"}, 317b6cda9bcSChris Mason {Opt_nodatasum, "nodatasum"}, 318be20aa9dSChris Mason {Opt_nodatacow, "nodatacow"}, 31921ad10cfSChris Mason {Opt_nobarrier, "nobarrier"}, 3206f568d35SChris Mason {Opt_max_inline, "max_inline=%s"}, 3218f662a76SChris Mason {Opt_alloc_start, "alloc_start=%s"}, 3224543df7eSChris Mason {Opt_thread_pool, "thread_pool=%d"}, 323c8b97818SChris Mason {Opt_compress, "compress"}, 324261507a0SLi Zefan {Opt_compress_type, "compress=%s"}, 325a555f810SChris Mason {Opt_compress_force, "compress-force"}, 326261507a0SLi Zefan {Opt_compress_force_type, "compress-force=%s"}, 327e18e4809SChris Mason {Opt_ssd, "ssd"}, 328451d7585SChris Mason {Opt_ssd_spread, "ssd_spread"}, 3293b30c22fSChris Mason {Opt_nossd, "nossd"}, 33033268eafSJosef Bacik {Opt_noacl, "noacl"}, 3313a5e1404SSage Weil {Opt_notreelog, "notreelog"}, 332dccae999SSage Weil {Opt_flushoncommit, "flushoncommit"}, 33397e728d4SJosef Bacik {Opt_ratio, "metadata_ratio=%d"}, 334e244a0aeSChristoph Hellwig {Opt_discard, "discard"}, 3350af3d00bSJosef Bacik {Opt_space_cache, "space_cache"}, 33688c2ba3bSJosef Bacik {Opt_clear_cache, "clear_cache"}, 3374260f7c7SSage Weil {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, 33891435650SChris Mason {Opt_enospc_debug, "enospc_debug"}, 339e15d0542SXin Zhong {Opt_subvolrootid, "subvolrootid=%d"}, 3404cb5300bSChris Mason {Opt_defrag, "autodefrag"}, 3414b9465cbSChris Mason {Opt_inode_cache, "inode_cache"}, 3428965593eSDavid Sterba {Opt_no_space_cache, "nospace_cache"}, 343af31f5e5SChris Mason {Opt_recovery, "recovery"}, 3449555c6c1SIlya Dryomov {Opt_skip_balance, "skip_balance"}, 34521adbd5cSStefan Behrens {Opt_check_integrity, "check_int"}, 34621adbd5cSStefan Behrens {Opt_check_integrity_including_extent_data, "check_int_data"}, 34721adbd5cSStefan Behrens {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, 3488c342930SJeff Mahoney {Opt_fatal_errors, "fatal_errors=%s"}, 34933268eafSJosef Bacik {Opt_err, NULL}, 35095e05289SChris Mason }; 35195e05289SChris Mason 352edf24abeSChristoph Hellwig /* 353edf24abeSChristoph Hellwig * Regular mount options parser. Everything that is needed only when 354edf24abeSChristoph Hellwig * reading in a new superblock is parsed here. 35549b25e05SJeff Mahoney * XXX JDM: This needs to be cleaned up for remount. 356edf24abeSChristoph Hellwig */ 357edf24abeSChristoph Hellwig int btrfs_parse_options(struct btrfs_root *root, char *options) 35895e05289SChris Mason { 359edf24abeSChristoph Hellwig struct btrfs_fs_info *info = root->fs_info; 36095e05289SChris Mason substring_t args[MAX_OPT_ARGS]; 36173bc1876SJosef Bacik char *p, *num, *orig = NULL; 36273bc1876SJosef Bacik u64 cache_gen; 3634543df7eSChris Mason int intarg; 364a7a3f7caSSage Weil int ret = 0; 365261507a0SLi Zefan char *compress_type; 366261507a0SLi Zefan bool compress_force = false; 367b6cda9bcSChris Mason 3686c41761fSDavid Sterba cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); 36973bc1876SJosef Bacik if (cache_gen) 37073bc1876SJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 37173bc1876SJosef Bacik 37295e05289SChris Mason if (!options) 37373bc1876SJosef Bacik goto out; 37495e05289SChris Mason 375be20aa9dSChris Mason /* 376be20aa9dSChris Mason * strsep changes the string, duplicate it because parse_options 377be20aa9dSChris Mason * gets called twice 378be20aa9dSChris Mason */ 379be20aa9dSChris Mason options = kstrdup(options, GFP_NOFS); 380be20aa9dSChris Mason if (!options) 381be20aa9dSChris Mason return -ENOMEM; 382be20aa9dSChris Mason 383da495eccSJosef Bacik orig = options; 384be20aa9dSChris Mason 38595e05289SChris Mason while ((p = strsep(&options, ",")) != NULL) { 38695e05289SChris Mason int token; 38795e05289SChris Mason if (!*p) 38895e05289SChris Mason continue; 38995e05289SChris Mason 39095e05289SChris Mason token = match_token(p, tokens, args); 39195e05289SChris Mason switch (token) { 392dfe25020SChris Mason case Opt_degraded: 393edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: allowing degraded mounts\n"); 394dfe25020SChris Mason btrfs_set_opt(info->mount_opt, DEGRADED); 395dfe25020SChris Mason break; 39695e05289SChris Mason case Opt_subvol: 39773f73415SJosef Bacik case Opt_subvolid: 398e15d0542SXin Zhong case Opt_subvolrootid: 39943e570b0SChristoph Hellwig case Opt_device: 400edf24abeSChristoph Hellwig /* 40143e570b0SChristoph Hellwig * These are parsed by btrfs_parse_early_options 402edf24abeSChristoph Hellwig * and can be happily ignored here. 403edf24abeSChristoph Hellwig */ 40495e05289SChris Mason break; 405b6cda9bcSChris Mason case Opt_nodatasum: 406067c28adSChris Mason printk(KERN_INFO "btrfs: setting nodatasum\n"); 407b6cda9bcSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 408be20aa9dSChris Mason break; 409be20aa9dSChris Mason case Opt_nodatacow: 410edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: setting nodatacow\n"); 411be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATACOW); 412be20aa9dSChris Mason btrfs_set_opt(info->mount_opt, NODATASUM); 413b6cda9bcSChris Mason break; 414a555f810SChris Mason case Opt_compress_force: 415261507a0SLi Zefan case Opt_compress_force_type: 416261507a0SLi Zefan compress_force = true; 417261507a0SLi Zefan case Opt_compress: 418261507a0SLi Zefan case Opt_compress_type: 419261507a0SLi Zefan if (token == Opt_compress || 420261507a0SLi Zefan token == Opt_compress_force || 421261507a0SLi Zefan strcmp(args[0].from, "zlib") == 0) { 422261507a0SLi Zefan compress_type = "zlib"; 423261507a0SLi Zefan info->compress_type = BTRFS_COMPRESS_ZLIB; 424063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 425a6fa6faeSLi Zefan } else if (strcmp(args[0].from, "lzo") == 0) { 426a6fa6faeSLi Zefan compress_type = "lzo"; 427a6fa6faeSLi Zefan info->compress_type = BTRFS_COMPRESS_LZO; 428063849eaSArnd Hannemann btrfs_set_opt(info->mount_opt, COMPRESS); 4292b0ce2c2SMitch Harder btrfs_set_fs_incompat(info, COMPRESS_LZO); 430063849eaSArnd Hannemann } else if (strncmp(args[0].from, "no", 2) == 0) { 431063849eaSArnd Hannemann compress_type = "no"; 432063849eaSArnd Hannemann info->compress_type = BTRFS_COMPRESS_NONE; 433063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, COMPRESS); 434063849eaSArnd Hannemann btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); 435063849eaSArnd Hannemann compress_force = false; 436261507a0SLi Zefan } else { 437261507a0SLi Zefan ret = -EINVAL; 438261507a0SLi Zefan goto out; 439261507a0SLi Zefan } 440261507a0SLi Zefan 441261507a0SLi Zefan if (compress_force) { 442261507a0SLi Zefan btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); 443261507a0SLi Zefan pr_info("btrfs: force %s compression\n", 444261507a0SLi Zefan compress_type); 445261507a0SLi Zefan } else 446261507a0SLi Zefan pr_info("btrfs: use %s compression\n", 447261507a0SLi Zefan compress_type); 448a555f810SChris Mason break; 449e18e4809SChris Mason case Opt_ssd: 450edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); 451e18e4809SChris Mason btrfs_set_opt(info->mount_opt, SSD); 452e18e4809SChris Mason break; 453451d7585SChris Mason case Opt_ssd_spread: 454451d7585SChris Mason printk(KERN_INFO "btrfs: use spread ssd " 455451d7585SChris Mason "allocation scheme\n"); 456451d7585SChris Mason btrfs_set_opt(info->mount_opt, SSD); 457451d7585SChris Mason btrfs_set_opt(info->mount_opt, SSD_SPREAD); 458451d7585SChris Mason break; 4593b30c22fSChris Mason case Opt_nossd: 460451d7585SChris Mason printk(KERN_INFO "btrfs: not using ssd allocation " 461451d7585SChris Mason "scheme\n"); 462c289811cSChris Mason btrfs_set_opt(info->mount_opt, NOSSD); 4633b30c22fSChris Mason btrfs_clear_opt(info->mount_opt, SSD); 464451d7585SChris Mason btrfs_clear_opt(info->mount_opt, SSD_SPREAD); 4653b30c22fSChris Mason break; 46621ad10cfSChris Mason case Opt_nobarrier: 467edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: turning off barriers\n"); 46821ad10cfSChris Mason btrfs_set_opt(info->mount_opt, NOBARRIER); 46921ad10cfSChris Mason break; 4704543df7eSChris Mason case Opt_thread_pool: 4714543df7eSChris Mason intarg = 0; 4724543df7eSChris Mason match_int(&args[0], &intarg); 4730d2450abSSergei Trofimovich if (intarg) 4744543df7eSChris Mason info->thread_pool_size = intarg; 4754543df7eSChris Mason break; 4766f568d35SChris Mason case Opt_max_inline: 477edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 4786f568d35SChris Mason if (num) { 47991748467SAkinobu Mita info->max_inline = memparse(num, NULL); 4806f568d35SChris Mason kfree(num); 4816f568d35SChris Mason 48215ada040SChris Mason if (info->max_inline) { 4836f568d35SChris Mason info->max_inline = max_t(u64, 48415ada040SChris Mason info->max_inline, 48515ada040SChris Mason root->sectorsize); 48615ada040SChris Mason } 487edf24abeSChristoph Hellwig printk(KERN_INFO "btrfs: max_inline at %llu\n", 48821380931SJoel Becker (unsigned long long)info->max_inline); 4896f568d35SChris Mason } 4906f568d35SChris Mason break; 4918f662a76SChris Mason case Opt_alloc_start: 492edf24abeSChristoph Hellwig num = match_strdup(&args[0]); 4938f662a76SChris Mason if (num) { 49491748467SAkinobu Mita info->alloc_start = memparse(num, NULL); 4958f662a76SChris Mason kfree(num); 496edf24abeSChristoph Hellwig printk(KERN_INFO 497edf24abeSChristoph Hellwig "btrfs: allocations start at %llu\n", 49821380931SJoel Becker (unsigned long long)info->alloc_start); 4998f662a76SChris Mason } 5008f662a76SChris Mason break; 50133268eafSJosef Bacik case Opt_noacl: 50233268eafSJosef Bacik root->fs_info->sb->s_flags &= ~MS_POSIXACL; 50333268eafSJosef Bacik break; 5043a5e1404SSage Weil case Opt_notreelog: 5053a5e1404SSage Weil printk(KERN_INFO "btrfs: disabling tree log\n"); 5063a5e1404SSage Weil btrfs_set_opt(info->mount_opt, NOTREELOG); 5073a5e1404SSage Weil break; 508dccae999SSage Weil case Opt_flushoncommit: 509dccae999SSage Weil printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); 510dccae999SSage Weil btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); 511dccae999SSage Weil break; 51297e728d4SJosef Bacik case Opt_ratio: 51397e728d4SJosef Bacik intarg = 0; 51497e728d4SJosef Bacik match_int(&args[0], &intarg); 51597e728d4SJosef Bacik if (intarg) { 51697e728d4SJosef Bacik info->metadata_ratio = intarg; 51797e728d4SJosef Bacik printk(KERN_INFO "btrfs: metadata ratio %d\n", 51897e728d4SJosef Bacik info->metadata_ratio); 51997e728d4SJosef Bacik } 52097e728d4SJosef Bacik break; 521e244a0aeSChristoph Hellwig case Opt_discard: 522e244a0aeSChristoph Hellwig btrfs_set_opt(info->mount_opt, DISCARD); 523e244a0aeSChristoph Hellwig break; 5240af3d00bSJosef Bacik case Opt_space_cache: 5250af3d00bSJosef Bacik btrfs_set_opt(info->mount_opt, SPACE_CACHE); 5260de90876SJosef Bacik break; 52773bc1876SJosef Bacik case Opt_no_space_cache: 52873bc1876SJosef Bacik printk(KERN_INFO "btrfs: disabling disk space caching\n"); 52973bc1876SJosef Bacik btrfs_clear_opt(info->mount_opt, SPACE_CACHE); 53073bc1876SJosef Bacik break; 5314b9465cbSChris Mason case Opt_inode_cache: 5324b9465cbSChris Mason printk(KERN_INFO "btrfs: enabling inode map caching\n"); 5334b9465cbSChris Mason btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); 5344b9465cbSChris Mason break; 53588c2ba3bSJosef Bacik case Opt_clear_cache: 53688c2ba3bSJosef Bacik printk(KERN_INFO "btrfs: force clearing of disk cache\n"); 53788c2ba3bSJosef Bacik btrfs_set_opt(info->mount_opt, CLEAR_CACHE); 5380af3d00bSJosef Bacik break; 5394260f7c7SSage Weil case Opt_user_subvol_rm_allowed: 5404260f7c7SSage Weil btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); 5414260f7c7SSage Weil break; 54291435650SChris Mason case Opt_enospc_debug: 54391435650SChris Mason btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); 54491435650SChris Mason break; 5454cb5300bSChris Mason case Opt_defrag: 5464cb5300bSChris Mason printk(KERN_INFO "btrfs: enabling auto defrag"); 5474cb5300bSChris Mason btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); 5484cb5300bSChris Mason break; 549af31f5e5SChris Mason case Opt_recovery: 550af31f5e5SChris Mason printk(KERN_INFO "btrfs: enabling auto recovery"); 551af31f5e5SChris Mason btrfs_set_opt(info->mount_opt, RECOVERY); 552af31f5e5SChris Mason break; 5539555c6c1SIlya Dryomov case Opt_skip_balance: 5549555c6c1SIlya Dryomov btrfs_set_opt(info->mount_opt, SKIP_BALANCE); 5559555c6c1SIlya Dryomov break; 55621adbd5cSStefan Behrens #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 55721adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 55821adbd5cSStefan Behrens printk(KERN_INFO "btrfs: enabling check integrity" 55921adbd5cSStefan Behrens " including extent data\n"); 56021adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, 56121adbd5cSStefan Behrens CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); 56221adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 56321adbd5cSStefan Behrens break; 56421adbd5cSStefan Behrens case Opt_check_integrity: 56521adbd5cSStefan Behrens printk(KERN_INFO "btrfs: enabling check integrity\n"); 56621adbd5cSStefan Behrens btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); 56721adbd5cSStefan Behrens break; 56821adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 56921adbd5cSStefan Behrens intarg = 0; 57021adbd5cSStefan Behrens match_int(&args[0], &intarg); 57121adbd5cSStefan Behrens if (intarg) { 57221adbd5cSStefan Behrens info->check_integrity_print_mask = intarg; 57321adbd5cSStefan Behrens printk(KERN_INFO "btrfs:" 57421adbd5cSStefan Behrens " check_integrity_print_mask 0x%x\n", 57521adbd5cSStefan Behrens info->check_integrity_print_mask); 57621adbd5cSStefan Behrens } 57721adbd5cSStefan Behrens break; 57821adbd5cSStefan Behrens #else 57921adbd5cSStefan Behrens case Opt_check_integrity_including_extent_data: 58021adbd5cSStefan Behrens case Opt_check_integrity: 58121adbd5cSStefan Behrens case Opt_check_integrity_print_mask: 58221adbd5cSStefan Behrens printk(KERN_ERR "btrfs: support for check_integrity*" 58321adbd5cSStefan Behrens " not compiled in!\n"); 58421adbd5cSStefan Behrens ret = -EINVAL; 58521adbd5cSStefan Behrens goto out; 58621adbd5cSStefan Behrens #endif 5878c342930SJeff Mahoney case Opt_fatal_errors: 5888c342930SJeff Mahoney if (strcmp(args[0].from, "panic") == 0) 5898c342930SJeff Mahoney btrfs_set_opt(info->mount_opt, 5908c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 5918c342930SJeff Mahoney else if (strcmp(args[0].from, "bug") == 0) 5928c342930SJeff Mahoney btrfs_clear_opt(info->mount_opt, 5938c342930SJeff Mahoney PANIC_ON_FATAL_ERROR); 5948c342930SJeff Mahoney else { 5958c342930SJeff Mahoney ret = -EINVAL; 5968c342930SJeff Mahoney goto out; 5978c342930SJeff Mahoney } 5988c342930SJeff Mahoney break; 599a7a3f7caSSage Weil case Opt_err: 600a7a3f7caSSage Weil printk(KERN_INFO "btrfs: unrecognized mount option " 601a7a3f7caSSage Weil "'%s'\n", p); 602a7a3f7caSSage Weil ret = -EINVAL; 603a7a3f7caSSage Weil goto out; 60495e05289SChris Mason default: 605be20aa9dSChris Mason break; 60695e05289SChris Mason } 60795e05289SChris Mason } 608a7a3f7caSSage Weil out: 60973bc1876SJosef Bacik if (!ret && btrfs_test_opt(root, SPACE_CACHE)) 61073bc1876SJosef Bacik printk(KERN_INFO "btrfs: disk space caching is enabled\n"); 611da495eccSJosef Bacik kfree(orig); 612a7a3f7caSSage Weil return ret; 613edf24abeSChristoph Hellwig } 614edf24abeSChristoph Hellwig 615edf24abeSChristoph Hellwig /* 616edf24abeSChristoph Hellwig * Parse mount options that are required early in the mount process. 617edf24abeSChristoph Hellwig * 618edf24abeSChristoph Hellwig * All other options will be parsed on much later in the mount process and 619edf24abeSChristoph Hellwig * only when we need to allocate a new super block. 620edf24abeSChristoph Hellwig */ 62197288f2cSChristoph Hellwig static int btrfs_parse_early_options(const char *options, fmode_t flags, 62273f73415SJosef Bacik void *holder, char **subvol_name, u64 *subvol_objectid, 623e15d0542SXin Zhong u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) 624edf24abeSChristoph Hellwig { 625edf24abeSChristoph Hellwig substring_t args[MAX_OPT_ARGS]; 62683c8c9bdSJeff Liu char *device_name, *opts, *orig, *p; 627edf24abeSChristoph Hellwig int error = 0; 62873f73415SJosef Bacik int intarg; 629edf24abeSChristoph Hellwig 630edf24abeSChristoph Hellwig if (!options) 631830c4adbSJosef Bacik return 0; 632edf24abeSChristoph Hellwig 633edf24abeSChristoph Hellwig /* 634edf24abeSChristoph Hellwig * strsep changes the string, duplicate it because parse_options 635edf24abeSChristoph Hellwig * gets called twice 636edf24abeSChristoph Hellwig */ 637edf24abeSChristoph Hellwig opts = kstrdup(options, GFP_KERNEL); 638edf24abeSChristoph Hellwig if (!opts) 639edf24abeSChristoph Hellwig return -ENOMEM; 6403f3d0bc0STero Roponen orig = opts; 641edf24abeSChristoph Hellwig 642edf24abeSChristoph Hellwig while ((p = strsep(&opts, ",")) != NULL) { 643edf24abeSChristoph Hellwig int token; 644edf24abeSChristoph Hellwig if (!*p) 645edf24abeSChristoph Hellwig continue; 646edf24abeSChristoph Hellwig 647edf24abeSChristoph Hellwig token = match_token(p, tokens, args); 648edf24abeSChristoph Hellwig switch (token) { 649edf24abeSChristoph Hellwig case Opt_subvol: 650a90e8b6fSIlya Dryomov kfree(*subvol_name); 651edf24abeSChristoph Hellwig *subvol_name = match_strdup(&args[0]); 652edf24abeSChristoph Hellwig break; 65373f73415SJosef Bacik case Opt_subvolid: 65473f73415SJosef Bacik intarg = 0; 6554849f01dSJosef Bacik error = match_int(&args[0], &intarg); 6564849f01dSJosef Bacik if (!error) { 6574849f01dSJosef Bacik /* we want the original fs_tree */ 6584849f01dSJosef Bacik if (!intarg) 6594849f01dSJosef Bacik *subvol_objectid = 6604849f01dSJosef Bacik BTRFS_FS_TREE_OBJECTID; 6614849f01dSJosef Bacik else 66273f73415SJosef Bacik *subvol_objectid = intarg; 6634849f01dSJosef Bacik } 66473f73415SJosef Bacik break; 665e15d0542SXin Zhong case Opt_subvolrootid: 666e15d0542SXin Zhong intarg = 0; 667e15d0542SXin Zhong error = match_int(&args[0], &intarg); 668e15d0542SXin Zhong if (!error) { 669e15d0542SXin Zhong /* we want the original fs_tree */ 670e15d0542SXin Zhong if (!intarg) 671e15d0542SXin Zhong *subvol_rootid = 672e15d0542SXin Zhong BTRFS_FS_TREE_OBJECTID; 673e15d0542SXin Zhong else 674e15d0542SXin Zhong *subvol_rootid = intarg; 675e15d0542SXin Zhong } 676e15d0542SXin Zhong break; 67743e570b0SChristoph Hellwig case Opt_device: 67883c8c9bdSJeff Liu device_name = match_strdup(&args[0]); 67983c8c9bdSJeff Liu if (!device_name) { 68083c8c9bdSJeff Liu error = -ENOMEM; 68183c8c9bdSJeff Liu goto out; 68283c8c9bdSJeff Liu } 68383c8c9bdSJeff Liu error = btrfs_scan_one_device(device_name, 68443e570b0SChristoph Hellwig flags, holder, fs_devices); 68583c8c9bdSJeff Liu kfree(device_name); 68643e570b0SChristoph Hellwig if (error) 687830c4adbSJosef Bacik goto out; 68843e570b0SChristoph Hellwig break; 689edf24abeSChristoph Hellwig default: 690edf24abeSChristoph Hellwig break; 691edf24abeSChristoph Hellwig } 692edf24abeSChristoph Hellwig } 693edf24abeSChristoph Hellwig 694edf24abeSChristoph Hellwig out: 695830c4adbSJosef Bacik kfree(orig); 696edf24abeSChristoph Hellwig return error; 69795e05289SChris Mason } 69895e05289SChris Mason 69973f73415SJosef Bacik static struct dentry *get_default_root(struct super_block *sb, 70073f73415SJosef Bacik u64 subvol_objectid) 70173f73415SJosef Bacik { 702815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 703815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 70473f73415SJosef Bacik struct btrfs_root *new_root; 70573f73415SJosef Bacik struct btrfs_dir_item *di; 70673f73415SJosef Bacik struct btrfs_path *path; 70773f73415SJosef Bacik struct btrfs_key location; 70873f73415SJosef Bacik struct inode *inode; 70973f73415SJosef Bacik u64 dir_id; 71073f73415SJosef Bacik int new = 0; 71173f73415SJosef Bacik 71273f73415SJosef Bacik /* 71373f73415SJosef Bacik * We have a specific subvol we want to mount, just setup location and 71473f73415SJosef Bacik * go look up the root. 71573f73415SJosef Bacik */ 71673f73415SJosef Bacik if (subvol_objectid) { 71773f73415SJosef Bacik location.objectid = subvol_objectid; 71873f73415SJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 71973f73415SJosef Bacik location.offset = (u64)-1; 72073f73415SJosef Bacik goto find_root; 72173f73415SJosef Bacik } 72273f73415SJosef Bacik 72373f73415SJosef Bacik path = btrfs_alloc_path(); 72473f73415SJosef Bacik if (!path) 72573f73415SJosef Bacik return ERR_PTR(-ENOMEM); 72673f73415SJosef Bacik path->leave_spinning = 1; 72773f73415SJosef Bacik 72873f73415SJosef Bacik /* 72973f73415SJosef Bacik * Find the "default" dir item which points to the root item that we 73073f73415SJosef Bacik * will mount by default if we haven't been given a specific subvolume 73173f73415SJosef Bacik * to mount. 73273f73415SJosef Bacik */ 733815745cfSAl Viro dir_id = btrfs_super_root_dir(fs_info->super_copy); 73473f73415SJosef Bacik di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); 735b0839166SJulia Lawall if (IS_ERR(di)) { 736b0839166SJulia Lawall btrfs_free_path(path); 737fb4f6f91SDan Carpenter return ERR_CAST(di); 738b0839166SJulia Lawall } 73973f73415SJosef Bacik if (!di) { 74073f73415SJosef Bacik /* 74173f73415SJosef Bacik * Ok the default dir item isn't there. This is weird since 74273f73415SJosef Bacik * it's always been there, but don't freak out, just try and 74373f73415SJosef Bacik * mount to root most subvolume. 74473f73415SJosef Bacik */ 74573f73415SJosef Bacik btrfs_free_path(path); 74673f73415SJosef Bacik dir_id = BTRFS_FIRST_FREE_OBJECTID; 747815745cfSAl Viro new_root = fs_info->fs_root; 74873f73415SJosef Bacik goto setup_root; 74973f73415SJosef Bacik } 75073f73415SJosef Bacik 75173f73415SJosef Bacik btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); 75273f73415SJosef Bacik btrfs_free_path(path); 75373f73415SJosef Bacik 75473f73415SJosef Bacik find_root: 755815745cfSAl Viro new_root = btrfs_read_fs_root_no_name(fs_info, &location); 75673f73415SJosef Bacik if (IS_ERR(new_root)) 757d0b678cbSJulia Lawall return ERR_CAST(new_root); 75873f73415SJosef Bacik 75973f73415SJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 76073f73415SJosef Bacik return ERR_PTR(-ENOENT); 76173f73415SJosef Bacik 76273f73415SJosef Bacik dir_id = btrfs_root_dirid(&new_root->root_item); 76373f73415SJosef Bacik setup_root: 76473f73415SJosef Bacik location.objectid = dir_id; 76573f73415SJosef Bacik location.type = BTRFS_INODE_ITEM_KEY; 76673f73415SJosef Bacik location.offset = 0; 76773f73415SJosef Bacik 76873f73415SJosef Bacik inode = btrfs_iget(sb, &location, new_root, &new); 7694cbd1149SDan Carpenter if (IS_ERR(inode)) 7704cbd1149SDan Carpenter return ERR_CAST(inode); 77173f73415SJosef Bacik 77273f73415SJosef Bacik /* 77373f73415SJosef Bacik * If we're just mounting the root most subvol put the inode and return 77473f73415SJosef Bacik * a reference to the dentry. We will have already gotten a reference 77573f73415SJosef Bacik * to the inode in btrfs_fill_super so we're good to go. 77673f73415SJosef Bacik */ 77773f73415SJosef Bacik if (!new && sb->s_root->d_inode == inode) { 77873f73415SJosef Bacik iput(inode); 77973f73415SJosef Bacik return dget(sb->s_root); 78073f73415SJosef Bacik } 78173f73415SJosef Bacik 782ba5b8958SJosef Bacik return d_obtain_alias(inode); 78373f73415SJosef Bacik } 78473f73415SJosef Bacik 7858a4b83ccSChris Mason static int btrfs_fill_super(struct super_block *sb, 7868a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices, 7878a4b83ccSChris Mason void *data, int silent) 7882e635a27SChris Mason { 7892e635a27SChris Mason struct inode *inode; 790815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 7915d4f98a2SYan Zheng struct btrfs_key key; 79239279cc3SChris Mason int err; 7932e635a27SChris Mason 7942e635a27SChris Mason sb->s_maxbytes = MAX_LFS_FILESIZE; 7952e635a27SChris Mason sb->s_magic = BTRFS_SUPER_MAGIC; 796e20d96d6SChris Mason sb->s_op = &btrfs_super_ops; 797af53d29aSAl Viro sb->s_d_op = &btrfs_dentry_operations; 798be6e8dc0SBalaji Rao sb->s_export_op = &btrfs_export_ops; 7995103e947SJosef Bacik sb->s_xattr = btrfs_xattr_handlers; 8002e635a27SChris Mason sb->s_time_gran = 1; 8010eda294dSChris Mason #ifdef CONFIG_BTRFS_FS_POSIX_ACL 80233268eafSJosef Bacik sb->s_flags |= MS_POSIXACL; 80349cf6f45SChris Ball #endif 8040c4d2d95SJosef Bacik sb->s_flags |= MS_I_VERSION; 805ad2b2c80SAl Viro err = open_ctree(sb, fs_devices, (char *)data); 806ad2b2c80SAl Viro if (err) { 807e20d96d6SChris Mason printk("btrfs: open_ctree failed\n"); 808ad2b2c80SAl Viro return err; 809e20d96d6SChris Mason } 810b888db2bSChris Mason 8115d4f98a2SYan Zheng key.objectid = BTRFS_FIRST_FREE_OBJECTID; 8125d4f98a2SYan Zheng key.type = BTRFS_INODE_ITEM_KEY; 8135d4f98a2SYan Zheng key.offset = 0; 81498c7089cSAl Viro inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); 8155d4f98a2SYan Zheng if (IS_ERR(inode)) { 8165d4f98a2SYan Zheng err = PTR_ERR(inode); 81739279cc3SChris Mason goto fail_close; 81839279cc3SChris Mason } 8192e635a27SChris Mason 82048fde701SAl Viro sb->s_root = d_make_root(inode); 82148fde701SAl Viro if (!sb->s_root) { 82239279cc3SChris Mason err = -ENOMEM; 82339279cc3SChris Mason goto fail_close; 8242e635a27SChris Mason } 82558176a96SJosef Bacik 8266885f308SChris Mason save_mount_options(sb, data); 82790a887c9SDan Magenheimer cleancache_init_fs(sb); 82859553edfSAl Viro sb->s_flags |= MS_ACTIVE; 8292e635a27SChris Mason return 0; 8302e635a27SChris Mason 83139279cc3SChris Mason fail_close: 832815745cfSAl Viro close_ctree(fs_info->tree_root); 833d5719762SChris Mason return err; 834d5719762SChris Mason } 835d5719762SChris Mason 8366bf13c0cSSage Weil int btrfs_sync_fs(struct super_block *sb, int wait) 837d5719762SChris Mason { 838d5719762SChris Mason struct btrfs_trans_handle *trans; 839815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 840815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 841df2ce34cSChris Mason 8421abe9b8aSliubo trace_btrfs_sync_fs(wait); 8431abe9b8aSliubo 844d561c025SChris Mason if (!wait) { 845815745cfSAl Viro filemap_flush(fs_info->btree_inode->i_mapping); 846df2ce34cSChris Mason return 0; 847d561c025SChris Mason } 848771ed689SChris Mason 84924bbcf04SYan, Zheng btrfs_wait_ordered_extents(root, 0, 0); 850771ed689SChris Mason 851bd7de2c9SJosef Bacik spin_lock(&fs_info->trans_lock); 852bd7de2c9SJosef Bacik if (!fs_info->running_transaction) { 853bd7de2c9SJosef Bacik spin_unlock(&fs_info->trans_lock); 854bd7de2c9SJosef Bacik return 0; 855bd7de2c9SJosef Bacik } 856bd7de2c9SJosef Bacik spin_unlock(&fs_info->trans_lock); 857bd7de2c9SJosef Bacik 858bd7de2c9SJosef Bacik trans = btrfs_join_transaction(root); 85998d5dc13STsutomu Itoh if (IS_ERR(trans)) 86098d5dc13STsutomu Itoh return PTR_ERR(trans); 861bd7de2c9SJosef Bacik return btrfs_commit_transaction(trans, root); 862d5719762SChris Mason } 863d5719762SChris Mason 86434c80b1dSAl Viro static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) 865a9572a15SEric Paris { 866815745cfSAl Viro struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); 867815745cfSAl Viro struct btrfs_root *root = info->tree_root; 868200da64eSTsutomu Itoh char *compress_type; 869a9572a15SEric Paris 870a9572a15SEric Paris if (btrfs_test_opt(root, DEGRADED)) 871a9572a15SEric Paris seq_puts(seq, ",degraded"); 872a9572a15SEric Paris if (btrfs_test_opt(root, NODATASUM)) 873a9572a15SEric Paris seq_puts(seq, ",nodatasum"); 874a9572a15SEric Paris if (btrfs_test_opt(root, NODATACOW)) 875a9572a15SEric Paris seq_puts(seq, ",nodatacow"); 876a9572a15SEric Paris if (btrfs_test_opt(root, NOBARRIER)) 877a9572a15SEric Paris seq_puts(seq, ",nobarrier"); 878a9572a15SEric Paris if (info->max_inline != 8192 * 1024) 87921380931SJoel Becker seq_printf(seq, ",max_inline=%llu", 88021380931SJoel Becker (unsigned long long)info->max_inline); 881a9572a15SEric Paris if (info->alloc_start != 0) 88221380931SJoel Becker seq_printf(seq, ",alloc_start=%llu", 88321380931SJoel Becker (unsigned long long)info->alloc_start); 884a9572a15SEric Paris if (info->thread_pool_size != min_t(unsigned long, 885a9572a15SEric Paris num_online_cpus() + 2, 8)) 886a9572a15SEric Paris seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); 887200da64eSTsutomu Itoh if (btrfs_test_opt(root, COMPRESS)) { 888200da64eSTsutomu Itoh if (info->compress_type == BTRFS_COMPRESS_ZLIB) 889200da64eSTsutomu Itoh compress_type = "zlib"; 890200da64eSTsutomu Itoh else 891200da64eSTsutomu Itoh compress_type = "lzo"; 892200da64eSTsutomu Itoh if (btrfs_test_opt(root, FORCE_COMPRESS)) 893200da64eSTsutomu Itoh seq_printf(seq, ",compress-force=%s", compress_type); 894200da64eSTsutomu Itoh else 895200da64eSTsutomu Itoh seq_printf(seq, ",compress=%s", compress_type); 896200da64eSTsutomu Itoh } 897c289811cSChris Mason if (btrfs_test_opt(root, NOSSD)) 898c289811cSChris Mason seq_puts(seq, ",nossd"); 899451d7585SChris Mason if (btrfs_test_opt(root, SSD_SPREAD)) 900451d7585SChris Mason seq_puts(seq, ",ssd_spread"); 901451d7585SChris Mason else if (btrfs_test_opt(root, SSD)) 902a9572a15SEric Paris seq_puts(seq, ",ssd"); 9033a5e1404SSage Weil if (btrfs_test_opt(root, NOTREELOG)) 9046b65c5c6SSage Weil seq_puts(seq, ",notreelog"); 905dccae999SSage Weil if (btrfs_test_opt(root, FLUSHONCOMMIT)) 9066b65c5c6SSage Weil seq_puts(seq, ",flushoncommit"); 90720a5239aSMatthew Wilcox if (btrfs_test_opt(root, DISCARD)) 90820a5239aSMatthew Wilcox seq_puts(seq, ",discard"); 909a9572a15SEric Paris if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) 910a9572a15SEric Paris seq_puts(seq, ",noacl"); 911200da64eSTsutomu Itoh if (btrfs_test_opt(root, SPACE_CACHE)) 912200da64eSTsutomu Itoh seq_puts(seq, ",space_cache"); 91373bc1876SJosef Bacik else 9148965593eSDavid Sterba seq_puts(seq, ",nospace_cache"); 915200da64eSTsutomu Itoh if (btrfs_test_opt(root, CLEAR_CACHE)) 916200da64eSTsutomu Itoh seq_puts(seq, ",clear_cache"); 917200da64eSTsutomu Itoh if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 918200da64eSTsutomu Itoh seq_puts(seq, ",user_subvol_rm_allowed"); 9190942caa3SDavid Sterba if (btrfs_test_opt(root, ENOSPC_DEBUG)) 9200942caa3SDavid Sterba seq_puts(seq, ",enospc_debug"); 9210942caa3SDavid Sterba if (btrfs_test_opt(root, AUTO_DEFRAG)) 9220942caa3SDavid Sterba seq_puts(seq, ",autodefrag"); 9230942caa3SDavid Sterba if (btrfs_test_opt(root, INODE_MAP_CACHE)) 9240942caa3SDavid Sterba seq_puts(seq, ",inode_cache"); 9259555c6c1SIlya Dryomov if (btrfs_test_opt(root, SKIP_BALANCE)) 9269555c6c1SIlya Dryomov seq_puts(seq, ",skip_balance"); 9278c342930SJeff Mahoney if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) 9288c342930SJeff Mahoney seq_puts(seq, ",fatal_errors=panic"); 929a9572a15SEric Paris return 0; 930a9572a15SEric Paris } 931a9572a15SEric Paris 932a061fc8dSChris Mason static int btrfs_test_super(struct super_block *s, void *data) 9332e635a27SChris Mason { 934815745cfSAl Viro struct btrfs_fs_info *p = data; 935815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(s); 9364b82d6e4SYan 937815745cfSAl Viro return fs_info->fs_devices == p->fs_devices; 9384b82d6e4SYan } 9394b82d6e4SYan 940450ba0eaSJosef Bacik static int btrfs_set_super(struct super_block *s, void *data) 941450ba0eaSJosef Bacik { 9426de1d09dSAl Viro int err = set_anon_super(s, data); 9436de1d09dSAl Viro if (!err) 944450ba0eaSJosef Bacik s->s_fs_info = data; 9456de1d09dSAl Viro return err; 946450ba0eaSJosef Bacik } 947450ba0eaSJosef Bacik 948830c4adbSJosef Bacik /* 949f9d9ef62SDavid Sterba * subvolumes are identified by ino 256 950f9d9ef62SDavid Sterba */ 951f9d9ef62SDavid Sterba static inline int is_subvolume_inode(struct inode *inode) 952f9d9ef62SDavid Sterba { 953f9d9ef62SDavid Sterba if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) 954f9d9ef62SDavid Sterba return 1; 955f9d9ef62SDavid Sterba return 0; 956f9d9ef62SDavid Sterba } 957f9d9ef62SDavid Sterba 958f9d9ef62SDavid Sterba /* 959830c4adbSJosef Bacik * This will strip out the subvol=%s argument for an argument string and add 960830c4adbSJosef Bacik * subvolid=0 to make sure we get the actual tree root for path walking to the 961830c4adbSJosef Bacik * subvol we want. 962830c4adbSJosef Bacik */ 963830c4adbSJosef Bacik static char *setup_root_args(char *args) 964830c4adbSJosef Bacik { 965f60d16a8SJim Meyering unsigned len = strlen(args) + 2 + 1; 966f60d16a8SJim Meyering char *src, *dst, *buf; 967830c4adbSJosef Bacik 968830c4adbSJosef Bacik /* 969f60d16a8SJim Meyering * We need the same args as before, but with this substitution: 970f60d16a8SJim Meyering * s!subvol=[^,]+!subvolid=0! 971830c4adbSJosef Bacik * 972f60d16a8SJim Meyering * Since the replacement string is up to 2 bytes longer than the 973f60d16a8SJim Meyering * original, allocate strlen(args) + 2 + 1 bytes. 974830c4adbSJosef Bacik */ 975830c4adbSJosef Bacik 976f60d16a8SJim Meyering src = strstr(args, "subvol="); 977830c4adbSJosef Bacik /* This shouldn't happen, but just in case.. */ 978f60d16a8SJim Meyering if (!src) 979830c4adbSJosef Bacik return NULL; 980f60d16a8SJim Meyering 981f60d16a8SJim Meyering buf = dst = kmalloc(len, GFP_NOFS); 982f60d16a8SJim Meyering if (!buf) 983f60d16a8SJim Meyering return NULL; 984830c4adbSJosef Bacik 985830c4adbSJosef Bacik /* 986f60d16a8SJim Meyering * If the subvol= arg is not at the start of the string, 987f60d16a8SJim Meyering * copy whatever precedes it into buf. 988830c4adbSJosef Bacik */ 989f60d16a8SJim Meyering if (src != args) { 990f60d16a8SJim Meyering *src++ = '\0'; 991f60d16a8SJim Meyering strcpy(buf, args); 992f60d16a8SJim Meyering dst += strlen(args); 993830c4adbSJosef Bacik } 994830c4adbSJosef Bacik 995f60d16a8SJim Meyering strcpy(dst, "subvolid=0"); 996f60d16a8SJim Meyering dst += strlen("subvolid=0"); 997830c4adbSJosef Bacik 998830c4adbSJosef Bacik /* 999f60d16a8SJim Meyering * If there is a "," after the original subvol=... string, 1000f60d16a8SJim Meyering * copy that suffix into our buffer. Otherwise, we're done. 1001830c4adbSJosef Bacik */ 1002f60d16a8SJim Meyering src = strchr(src, ','); 1003f60d16a8SJim Meyering if (src) 1004f60d16a8SJim Meyering strcpy(dst, src); 1005830c4adbSJosef Bacik 1006f60d16a8SJim Meyering return buf; 1007830c4adbSJosef Bacik } 1008830c4adbSJosef Bacik 1009830c4adbSJosef Bacik static struct dentry *mount_subvol(const char *subvol_name, int flags, 1010830c4adbSJosef Bacik const char *device_name, char *data) 1011830c4adbSJosef Bacik { 1012830c4adbSJosef Bacik struct dentry *root; 1013830c4adbSJosef Bacik struct vfsmount *mnt; 1014830c4adbSJosef Bacik char *newargs; 1015830c4adbSJosef Bacik 1016830c4adbSJosef Bacik newargs = setup_root_args(data); 1017830c4adbSJosef Bacik if (!newargs) 1018830c4adbSJosef Bacik return ERR_PTR(-ENOMEM); 1019830c4adbSJosef Bacik mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, 1020830c4adbSJosef Bacik newargs); 1021830c4adbSJosef Bacik kfree(newargs); 1022830c4adbSJosef Bacik if (IS_ERR(mnt)) 1023830c4adbSJosef Bacik return ERR_CAST(mnt); 1024830c4adbSJosef Bacik 1025ea441d11SAl Viro root = mount_subtree(mnt, subvol_name); 1026830c4adbSJosef Bacik 1027ea441d11SAl Viro if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { 1028ea441d11SAl Viro struct super_block *s = root->d_sb; 1029ea441d11SAl Viro dput(root); 1030ea441d11SAl Viro root = ERR_PTR(-EINVAL); 1031ea441d11SAl Viro deactivate_locked_super(s); 1032f9d9ef62SDavid Sterba printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", 1033f9d9ef62SDavid Sterba subvol_name); 1034f9d9ef62SDavid Sterba } 1035f9d9ef62SDavid Sterba 1036830c4adbSJosef Bacik return root; 1037830c4adbSJosef Bacik } 1038450ba0eaSJosef Bacik 1039edf24abeSChristoph Hellwig /* 1040edf24abeSChristoph Hellwig * Find a superblock for the given device / mount point. 1041edf24abeSChristoph Hellwig * 1042edf24abeSChristoph Hellwig * Note: This is based on get_sb_bdev from fs/super.c with a few additions 1043edf24abeSChristoph Hellwig * for multiple device setup. Make sure to keep it in sync. 1044edf24abeSChristoph Hellwig */ 1045061dbc6bSAl Viro static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, 1046306e16ceSDavid Sterba const char *device_name, void *data) 10474b82d6e4SYan { 10484b82d6e4SYan struct block_device *bdev = NULL; 10494b82d6e4SYan struct super_block *s; 10504b82d6e4SYan struct dentry *root; 10518a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices = NULL; 1052450ba0eaSJosef Bacik struct btrfs_fs_info *fs_info = NULL; 105397288f2cSChristoph Hellwig fmode_t mode = FMODE_READ; 105473f73415SJosef Bacik char *subvol_name = NULL; 105573f73415SJosef Bacik u64 subvol_objectid = 0; 1056e15d0542SXin Zhong u64 subvol_rootid = 0; 10574b82d6e4SYan int error = 0; 10584b82d6e4SYan 105997288f2cSChristoph Hellwig if (!(flags & MS_RDONLY)) 106097288f2cSChristoph Hellwig mode |= FMODE_WRITE; 106197288f2cSChristoph Hellwig 106297288f2cSChristoph Hellwig error = btrfs_parse_early_options(data, mode, fs_type, 106373f73415SJosef Bacik &subvol_name, &subvol_objectid, 1064e15d0542SXin Zhong &subvol_rootid, &fs_devices); 1065f23c8af8SIlya Dryomov if (error) { 1066f23c8af8SIlya Dryomov kfree(subvol_name); 1067061dbc6bSAl Viro return ERR_PTR(error); 1068f23c8af8SIlya Dryomov } 1069edf24abeSChristoph Hellwig 1070830c4adbSJosef Bacik if (subvol_name) { 1071830c4adbSJosef Bacik root = mount_subvol(subvol_name, flags, device_name, data); 1072830c4adbSJosef Bacik kfree(subvol_name); 1073830c4adbSJosef Bacik return root; 1074830c4adbSJosef Bacik } 1075830c4adbSJosef Bacik 1076306e16ceSDavid Sterba error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); 10778a4b83ccSChris Mason if (error) 1078830c4adbSJosef Bacik return ERR_PTR(error); 10794b82d6e4SYan 1080450ba0eaSJosef Bacik /* 1081450ba0eaSJosef Bacik * Setup a dummy root and fs_info for test/set super. This is because 1082450ba0eaSJosef Bacik * we don't actually fill this stuff out until open_ctree, but we need 1083450ba0eaSJosef Bacik * it for searching for existing supers, so this lets us do that and 1084450ba0eaSJosef Bacik * then open_ctree will properly initialize everything later. 1085450ba0eaSJosef Bacik */ 1086450ba0eaSJosef Bacik fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); 108704d21a24SIlya Dryomov if (!fs_info) 108804d21a24SIlya Dryomov return ERR_PTR(-ENOMEM); 108904d21a24SIlya Dryomov 1090450ba0eaSJosef Bacik fs_info->fs_devices = fs_devices; 1091450ba0eaSJosef Bacik 10926c41761fSDavid Sterba fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 10936c41761fSDavid Sterba fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); 10946c41761fSDavid Sterba if (!fs_info->super_copy || !fs_info->super_for_commit) { 10956c41761fSDavid Sterba error = -ENOMEM; 109604d21a24SIlya Dryomov goto error_fs_info; 109704d21a24SIlya Dryomov } 109804d21a24SIlya Dryomov 109904d21a24SIlya Dryomov error = btrfs_open_devices(fs_devices, mode, fs_type); 110004d21a24SIlya Dryomov if (error) 110104d21a24SIlya Dryomov goto error_fs_info; 110204d21a24SIlya Dryomov 110304d21a24SIlya Dryomov if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { 110404d21a24SIlya Dryomov error = -EACCES; 11056c41761fSDavid Sterba goto error_close_devices; 11066c41761fSDavid Sterba } 11076c41761fSDavid Sterba 1108dfe25020SChris Mason bdev = fs_devices->latest_bdev; 11099249e17fSDavid Howells s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, 11109249e17fSDavid Howells fs_info); 1111830c4adbSJosef Bacik if (IS_ERR(s)) { 1112830c4adbSJosef Bacik error = PTR_ERR(s); 1113830c4adbSJosef Bacik goto error_close_devices; 1114830c4adbSJosef Bacik } 11154b82d6e4SYan 11164b82d6e4SYan if (s->s_root) { 11172b82032cSYan Zheng btrfs_close_devices(fs_devices); 11186c41761fSDavid Sterba free_fs_info(fs_info); 111959553edfSAl Viro if ((flags ^ s->s_flags) & MS_RDONLY) 112059553edfSAl Viro error = -EBUSY; 11214b82d6e4SYan } else { 11224b82d6e4SYan char b[BDEVNAME_SIZE]; 11234b82d6e4SYan 11244b82d6e4SYan strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); 1125815745cfSAl Viro btrfs_sb(s)->bdev_holder = fs_type; 11268a4b83ccSChris Mason error = btrfs_fill_super(s, fs_devices, data, 11278a4b83ccSChris Mason flags & MS_SILENT ? 1 : 0); 11284b82d6e4SYan } 11294b82d6e4SYan 113059553edfSAl Viro root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); 113159553edfSAl Viro if (IS_ERR(root)) 1132e15d0542SXin Zhong deactivate_locked_super(s); 11334b82d6e4SYan 1134061dbc6bSAl Viro return root; 11354b82d6e4SYan 1136c146afadSYan Zheng error_close_devices: 11378a4b83ccSChris Mason btrfs_close_devices(fs_devices); 113804d21a24SIlya Dryomov error_fs_info: 11396c41761fSDavid Sterba free_fs_info(fs_info); 1140061dbc6bSAl Viro return ERR_PTR(error); 11414b82d6e4SYan } 11422e635a27SChris Mason 11430d2450abSSergei Trofimovich static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) 11440d2450abSSergei Trofimovich { 11450d2450abSSergei Trofimovich spin_lock_irq(&workers->lock); 11460d2450abSSergei Trofimovich workers->max_workers = new_limit; 11470d2450abSSergei Trofimovich spin_unlock_irq(&workers->lock); 11480d2450abSSergei Trofimovich } 11490d2450abSSergei Trofimovich 11500d2450abSSergei Trofimovich static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, 11510d2450abSSergei Trofimovich int new_pool_size, int old_pool_size) 11520d2450abSSergei Trofimovich { 11530d2450abSSergei Trofimovich if (new_pool_size == old_pool_size) 11540d2450abSSergei Trofimovich return; 11550d2450abSSergei Trofimovich 11560d2450abSSergei Trofimovich fs_info->thread_pool_size = new_pool_size; 11570d2450abSSergei Trofimovich 11580d2450abSSergei Trofimovich printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", 11590d2450abSSergei Trofimovich old_pool_size, new_pool_size); 11600d2450abSSergei Trofimovich 11610d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); 11620d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->workers, new_pool_size); 11630d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); 11640d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); 11650d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); 11660d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); 11670d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); 11680d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); 11690d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); 11700d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); 11710d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); 11720d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); 11730d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); 11740d2450abSSergei Trofimovich btrfs_set_max_workers(&fs_info->scrub_workers, new_pool_size); 11750d2450abSSergei Trofimovich } 11760d2450abSSergei Trofimovich 1177c146afadSYan Zheng static int btrfs_remount(struct super_block *sb, int *flags, char *data) 1178c146afadSYan Zheng { 1179815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1180815745cfSAl Viro struct btrfs_root *root = fs_info->tree_root; 118149b25e05SJeff Mahoney unsigned old_flags = sb->s_flags; 118249b25e05SJeff Mahoney unsigned long old_opts = fs_info->mount_opt; 118349b25e05SJeff Mahoney unsigned long old_compress_type = fs_info->compress_type; 118449b25e05SJeff Mahoney u64 old_max_inline = fs_info->max_inline; 118549b25e05SJeff Mahoney u64 old_alloc_start = fs_info->alloc_start; 118649b25e05SJeff Mahoney int old_thread_pool_size = fs_info->thread_pool_size; 118749b25e05SJeff Mahoney unsigned int old_metadata_ratio = fs_info->metadata_ratio; 1188c146afadSYan Zheng int ret; 1189c146afadSYan Zheng 1190b288052eSChris Mason ret = btrfs_parse_options(root, data); 119149b25e05SJeff Mahoney if (ret) { 119249b25e05SJeff Mahoney ret = -EINVAL; 119349b25e05SJeff Mahoney goto restore; 119449b25e05SJeff Mahoney } 1195b288052eSChris Mason 11960d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 11970d2450abSSergei Trofimovich fs_info->thread_pool_size, old_thread_pool_size); 11980d2450abSSergei Trofimovich 1199c146afadSYan Zheng if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1200c146afadSYan Zheng return 0; 1201c146afadSYan Zheng 1202c146afadSYan Zheng if (*flags & MS_RDONLY) { 1203c146afadSYan Zheng sb->s_flags |= MS_RDONLY; 1204c146afadSYan Zheng 1205c146afadSYan Zheng ret = btrfs_commit_super(root); 120649b25e05SJeff Mahoney if (ret) 120749b25e05SJeff Mahoney goto restore; 1208c146afadSYan Zheng } else { 12098a3db184SSergei Trofimovich if (fs_info->fs_devices->rw_devices == 0) { 121049b25e05SJeff Mahoney ret = -EACCES; 121149b25e05SJeff Mahoney goto restore; 12128a3db184SSergei Trofimovich } 12132b82032cSYan Zheng 12148a3db184SSergei Trofimovich if (btrfs_super_log_root(fs_info->super_copy) != 0) { 121549b25e05SJeff Mahoney ret = -EINVAL; 121649b25e05SJeff Mahoney goto restore; 12178a3db184SSergei Trofimovich } 1218c146afadSYan Zheng 1219815745cfSAl Viro ret = btrfs_cleanup_fs_roots(fs_info); 122049b25e05SJeff Mahoney if (ret) 122149b25e05SJeff Mahoney goto restore; 1222c146afadSYan Zheng 1223d68fc57bSYan, Zheng /* recover relocation */ 1224d68fc57bSYan, Zheng ret = btrfs_recover_relocation(root); 122549b25e05SJeff Mahoney if (ret) 122649b25e05SJeff Mahoney goto restore; 1227c146afadSYan Zheng 12282b6ba629SIlya Dryomov ret = btrfs_resume_balance_async(fs_info); 12292b6ba629SIlya Dryomov if (ret) 12302b6ba629SIlya Dryomov goto restore; 12312b6ba629SIlya Dryomov 1232c146afadSYan Zheng sb->s_flags &= ~MS_RDONLY; 1233c146afadSYan Zheng } 1234c146afadSYan Zheng 1235c146afadSYan Zheng return 0; 123649b25e05SJeff Mahoney 123749b25e05SJeff Mahoney restore: 123849b25e05SJeff Mahoney /* We've hit an error - don't reset MS_RDONLY */ 123949b25e05SJeff Mahoney if (sb->s_flags & MS_RDONLY) 124049b25e05SJeff Mahoney old_flags |= MS_RDONLY; 124149b25e05SJeff Mahoney sb->s_flags = old_flags; 124249b25e05SJeff Mahoney fs_info->mount_opt = old_opts; 124349b25e05SJeff Mahoney fs_info->compress_type = old_compress_type; 124449b25e05SJeff Mahoney fs_info->max_inline = old_max_inline; 124549b25e05SJeff Mahoney fs_info->alloc_start = old_alloc_start; 12460d2450abSSergei Trofimovich btrfs_resize_thread_pool(fs_info, 12470d2450abSSergei Trofimovich old_thread_pool_size, fs_info->thread_pool_size); 124849b25e05SJeff Mahoney fs_info->metadata_ratio = old_metadata_ratio; 124949b25e05SJeff Mahoney return ret; 1250c146afadSYan Zheng } 1251c146afadSYan Zheng 1252bcd53741SArne Jansen /* Used to sort the devices by max_avail(descending sort) */ 1253bcd53741SArne Jansen static int btrfs_cmp_device_free_bytes(const void *dev_info1, 1254bcd53741SArne Jansen const void *dev_info2) 1255bcd53741SArne Jansen { 1256bcd53741SArne Jansen if (((struct btrfs_device_info *)dev_info1)->max_avail > 1257bcd53741SArne Jansen ((struct btrfs_device_info *)dev_info2)->max_avail) 1258bcd53741SArne Jansen return -1; 1259bcd53741SArne Jansen else 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 1263bcd53741SArne Jansen return 0; 1264bcd53741SArne Jansen } 1265bcd53741SArne Jansen 1266bcd53741SArne Jansen /* 1267bcd53741SArne Jansen * sort the devices by max_avail, in which max free extent size of each device 1268bcd53741SArne Jansen * is stored.(Descending Sort) 1269bcd53741SArne Jansen */ 1270bcd53741SArne Jansen static inline void btrfs_descending_sort_devices( 1271bcd53741SArne Jansen struct btrfs_device_info *devices, 1272bcd53741SArne Jansen size_t nr_devices) 1273bcd53741SArne Jansen { 1274bcd53741SArne Jansen sort(devices, nr_devices, sizeof(struct btrfs_device_info), 1275bcd53741SArne Jansen btrfs_cmp_device_free_bytes, NULL); 1276bcd53741SArne Jansen } 1277bcd53741SArne Jansen 12786d07bcecSMiao Xie /* 12796d07bcecSMiao Xie * The helper to calc the free space on the devices that can be used to store 12806d07bcecSMiao Xie * file data. 12816d07bcecSMiao Xie */ 12826d07bcecSMiao Xie static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) 12836d07bcecSMiao Xie { 12846d07bcecSMiao Xie struct btrfs_fs_info *fs_info = root->fs_info; 12856d07bcecSMiao Xie struct btrfs_device_info *devices_info; 12866d07bcecSMiao Xie struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 12876d07bcecSMiao Xie struct btrfs_device *device; 12886d07bcecSMiao Xie u64 skip_space; 12896d07bcecSMiao Xie u64 type; 12906d07bcecSMiao Xie u64 avail_space; 12916d07bcecSMiao Xie u64 used_space; 12926d07bcecSMiao Xie u64 min_stripe_size; 129339fb26c3SMiao Xie int min_stripes = 1, num_stripes = 1; 12946d07bcecSMiao Xie int i = 0, nr_devices; 12956d07bcecSMiao Xie int ret; 12966d07bcecSMiao Xie 1297b772a86eSLi Zefan nr_devices = fs_info->fs_devices->open_devices; 12986d07bcecSMiao Xie BUG_ON(!nr_devices); 12996d07bcecSMiao Xie 13006d07bcecSMiao Xie devices_info = kmalloc(sizeof(*devices_info) * nr_devices, 13016d07bcecSMiao Xie GFP_NOFS); 13026d07bcecSMiao Xie if (!devices_info) 13036d07bcecSMiao Xie return -ENOMEM; 13046d07bcecSMiao Xie 13056d07bcecSMiao Xie /* calc min stripe number for data space alloction */ 13066d07bcecSMiao Xie type = btrfs_get_alloc_profile(root, 1); 130739fb26c3SMiao Xie if (type & BTRFS_BLOCK_GROUP_RAID0) { 13086d07bcecSMiao Xie min_stripes = 2; 130939fb26c3SMiao Xie num_stripes = nr_devices; 131039fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID1) { 13116d07bcecSMiao Xie min_stripes = 2; 131239fb26c3SMiao Xie num_stripes = 2; 131339fb26c3SMiao Xie } else if (type & BTRFS_BLOCK_GROUP_RAID10) { 13146d07bcecSMiao Xie min_stripes = 4; 131539fb26c3SMiao Xie num_stripes = 4; 131639fb26c3SMiao Xie } 13176d07bcecSMiao Xie 13186d07bcecSMiao Xie if (type & BTRFS_BLOCK_GROUP_DUP) 13196d07bcecSMiao Xie min_stripe_size = 2 * BTRFS_STRIPE_LEN; 13206d07bcecSMiao Xie else 13216d07bcecSMiao Xie min_stripe_size = BTRFS_STRIPE_LEN; 13226d07bcecSMiao Xie 1323b772a86eSLi Zefan list_for_each_entry(device, &fs_devices->devices, dev_list) { 1324b772a86eSLi Zefan if (!device->in_fs_metadata || !device->bdev) 13256d07bcecSMiao Xie continue; 13266d07bcecSMiao Xie 13276d07bcecSMiao Xie avail_space = device->total_bytes - device->bytes_used; 13286d07bcecSMiao Xie 13296d07bcecSMiao Xie /* align with stripe_len */ 13306d07bcecSMiao Xie do_div(avail_space, BTRFS_STRIPE_LEN); 13316d07bcecSMiao Xie avail_space *= BTRFS_STRIPE_LEN; 13326d07bcecSMiao Xie 13336d07bcecSMiao Xie /* 13346d07bcecSMiao Xie * In order to avoid overwritting the superblock on the drive, 13356d07bcecSMiao Xie * btrfs starts at an offset of at least 1MB when doing chunk 13366d07bcecSMiao Xie * allocation. 13376d07bcecSMiao Xie */ 13386d07bcecSMiao Xie skip_space = 1024 * 1024; 13396d07bcecSMiao Xie 13406d07bcecSMiao Xie /* user can set the offset in fs_info->alloc_start. */ 13416d07bcecSMiao Xie if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= 13426d07bcecSMiao Xie device->total_bytes) 13436d07bcecSMiao Xie skip_space = max(fs_info->alloc_start, skip_space); 13446d07bcecSMiao Xie 13456d07bcecSMiao Xie /* 13466d07bcecSMiao Xie * btrfs can not use the free space in [0, skip_space - 1], 13476d07bcecSMiao Xie * we must subtract it from the total. In order to implement 13486d07bcecSMiao Xie * it, we account the used space in this range first. 13496d07bcecSMiao Xie */ 13506d07bcecSMiao Xie ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, 13516d07bcecSMiao Xie &used_space); 13526d07bcecSMiao Xie if (ret) { 13536d07bcecSMiao Xie kfree(devices_info); 13546d07bcecSMiao Xie return ret; 13556d07bcecSMiao Xie } 13566d07bcecSMiao Xie 13576d07bcecSMiao Xie /* calc the free space in [0, skip_space - 1] */ 13586d07bcecSMiao Xie skip_space -= used_space; 13596d07bcecSMiao Xie 13606d07bcecSMiao Xie /* 13616d07bcecSMiao Xie * we can use the free space in [0, skip_space - 1], subtract 13626d07bcecSMiao Xie * it from the total. 13636d07bcecSMiao Xie */ 13646d07bcecSMiao Xie if (avail_space && avail_space >= skip_space) 13656d07bcecSMiao Xie avail_space -= skip_space; 13666d07bcecSMiao Xie else 13676d07bcecSMiao Xie avail_space = 0; 13686d07bcecSMiao Xie 13696d07bcecSMiao Xie if (avail_space < min_stripe_size) 13706d07bcecSMiao Xie continue; 13716d07bcecSMiao Xie 13726d07bcecSMiao Xie devices_info[i].dev = device; 13736d07bcecSMiao Xie devices_info[i].max_avail = avail_space; 13746d07bcecSMiao Xie 13756d07bcecSMiao Xie i++; 13766d07bcecSMiao Xie } 13776d07bcecSMiao Xie 13786d07bcecSMiao Xie nr_devices = i; 13796d07bcecSMiao Xie 13806d07bcecSMiao Xie btrfs_descending_sort_devices(devices_info, nr_devices); 13816d07bcecSMiao Xie 13826d07bcecSMiao Xie i = nr_devices - 1; 13836d07bcecSMiao Xie avail_space = 0; 13846d07bcecSMiao Xie while (nr_devices >= min_stripes) { 138539fb26c3SMiao Xie if (num_stripes > nr_devices) 138639fb26c3SMiao Xie num_stripes = nr_devices; 138739fb26c3SMiao Xie 13886d07bcecSMiao Xie if (devices_info[i].max_avail >= min_stripe_size) { 13896d07bcecSMiao Xie int j; 13906d07bcecSMiao Xie u64 alloc_size; 13916d07bcecSMiao Xie 139239fb26c3SMiao Xie avail_space += devices_info[i].max_avail * num_stripes; 13936d07bcecSMiao Xie alloc_size = devices_info[i].max_avail; 139439fb26c3SMiao Xie for (j = i + 1 - num_stripes; j <= i; j++) 13956d07bcecSMiao Xie devices_info[j].max_avail -= alloc_size; 13966d07bcecSMiao Xie } 13976d07bcecSMiao Xie i--; 13986d07bcecSMiao Xie nr_devices--; 13996d07bcecSMiao Xie } 14006d07bcecSMiao Xie 14016d07bcecSMiao Xie kfree(devices_info); 14026d07bcecSMiao Xie *free_bytes = avail_space; 14036d07bcecSMiao Xie return 0; 14046d07bcecSMiao Xie } 14056d07bcecSMiao Xie 14068fd17795SChris Mason static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 14078fd17795SChris Mason { 1408815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); 1409815745cfSAl Viro struct btrfs_super_block *disk_super = fs_info->super_copy; 1410815745cfSAl Viro struct list_head *head = &fs_info->space_info; 1411bd4d1088SJosef Bacik struct btrfs_space_info *found; 1412bd4d1088SJosef Bacik u64 total_used = 0; 14136d07bcecSMiao Xie u64 total_free_data = 0; 1414db94535dSChris Mason int bits = dentry->d_sb->s_blocksize_bits; 1415815745cfSAl Viro __be32 *fsid = (__be32 *)fs_info->fsid; 14166d07bcecSMiao Xie int ret; 14178fd17795SChris Mason 14186d07bcecSMiao Xie /* holding chunk_muext to avoid allocating new chunks */ 1419815745cfSAl Viro mutex_lock(&fs_info->chunk_mutex); 1420bd4d1088SJosef Bacik rcu_read_lock(); 142189a55897SJosef Bacik list_for_each_entry_rcu(found, head, list) { 14226d07bcecSMiao Xie if (found->flags & BTRFS_BLOCK_GROUP_DATA) { 14236d07bcecSMiao Xie total_free_data += found->disk_total - found->disk_used; 14246d07bcecSMiao Xie total_free_data -= 14256d07bcecSMiao Xie btrfs_account_ro_block_groups_free_space(found); 14266d07bcecSMiao Xie } 14276d07bcecSMiao Xie 1428b742bb82SYan, Zheng total_used += found->disk_used; 142989a55897SJosef Bacik } 1430bd4d1088SJosef Bacik rcu_read_unlock(); 1431bd4d1088SJosef Bacik 14328fd17795SChris Mason buf->f_namelen = BTRFS_NAME_LEN; 1433db94535dSChris Mason buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; 1434bd4d1088SJosef Bacik buf->f_bfree = buf->f_blocks - (total_used >> bits); 14358fd17795SChris Mason buf->f_bsize = dentry->d_sb->s_blocksize; 14368fd17795SChris Mason buf->f_type = BTRFS_SUPER_MAGIC; 14376d07bcecSMiao Xie buf->f_bavail = total_free_data; 1438815745cfSAl Viro ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); 14396d07bcecSMiao Xie if (ret) { 1440815745cfSAl Viro mutex_unlock(&fs_info->chunk_mutex); 14416d07bcecSMiao Xie return ret; 14426d07bcecSMiao Xie } 14436d07bcecSMiao Xie buf->f_bavail += total_free_data; 14446d07bcecSMiao Xie buf->f_bavail = buf->f_bavail >> bits; 1445815745cfSAl Viro mutex_unlock(&fs_info->chunk_mutex); 1446d397712bSChris Mason 14479d03632eSDavid Woodhouse /* We treat it as constant endianness (it doesn't matter _which_) 14489d03632eSDavid Woodhouse because we want the fsid to come out the same whether mounted 14499d03632eSDavid Woodhouse on a big-endian or little-endian host */ 14509d03632eSDavid Woodhouse buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); 14519d03632eSDavid Woodhouse buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); 145232d48fa1SDavid Woodhouse /* Mask in the root object ID too, to disambiguate subvols */ 145332d48fa1SDavid Woodhouse buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; 145432d48fa1SDavid Woodhouse buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; 145532d48fa1SDavid Woodhouse 14568fd17795SChris Mason return 0; 14578fd17795SChris Mason } 1458b5133862SChris Mason 1459aea52e19SAl Viro static void btrfs_kill_super(struct super_block *sb) 1460aea52e19SAl Viro { 1461815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1462aea52e19SAl Viro kill_anon_super(sb); 1463aea52e19SAl Viro free_fs_info(fs_info); 1464aea52e19SAl Viro } 1465aea52e19SAl Viro 14662e635a27SChris Mason static struct file_system_type btrfs_fs_type = { 14672e635a27SChris Mason .owner = THIS_MODULE, 14682e635a27SChris Mason .name = "btrfs", 1469061dbc6bSAl Viro .mount = btrfs_mount, 1470aea52e19SAl Viro .kill_sb = btrfs_kill_super, 14712e635a27SChris Mason .fs_flags = FS_REQUIRES_DEV, 14722e635a27SChris Mason }; 1473a9218f6bSChris Mason 1474d352ac68SChris Mason /* 1475d352ac68SChris Mason * used by btrfsctl to scan devices when no FS is mounted 1476d352ac68SChris Mason */ 14778a4b83ccSChris Mason static long btrfs_control_ioctl(struct file *file, unsigned int cmd, 14788a4b83ccSChris Mason unsigned long arg) 14798a4b83ccSChris Mason { 14808a4b83ccSChris Mason struct btrfs_ioctl_vol_args *vol; 14818a4b83ccSChris Mason struct btrfs_fs_devices *fs_devices; 1482c071fcfdSChris Mason int ret = -ENOTTY; 14838a4b83ccSChris Mason 1484e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1485e441d54dSChris Mason return -EPERM; 1486e441d54dSChris Mason 1487dae7b665SLi Zefan vol = memdup_user((void __user *)arg, sizeof(*vol)); 1488dae7b665SLi Zefan if (IS_ERR(vol)) 1489dae7b665SLi Zefan return PTR_ERR(vol); 1490c071fcfdSChris Mason 14918a4b83ccSChris Mason switch (cmd) { 14928a4b83ccSChris Mason case BTRFS_IOC_SCAN_DEV: 149397288f2cSChristoph Hellwig ret = btrfs_scan_one_device(vol->name, FMODE_READ, 14948a4b83ccSChris Mason &btrfs_fs_type, &fs_devices); 14958a4b83ccSChris Mason break; 149602db0844SJosef Bacik case BTRFS_IOC_DEVICES_READY: 149702db0844SJosef Bacik ret = btrfs_scan_one_device(vol->name, FMODE_READ, 149802db0844SJosef Bacik &btrfs_fs_type, &fs_devices); 149902db0844SJosef Bacik if (ret) 150002db0844SJosef Bacik break; 150102db0844SJosef Bacik ret = !(fs_devices->num_devices == fs_devices->total_devices); 150202db0844SJosef Bacik break; 15038a4b83ccSChris Mason } 1504dae7b665SLi Zefan 15058a4b83ccSChris Mason kfree(vol); 1506f819d837SLinda Knippers return ret; 15078a4b83ccSChris Mason } 15088a4b83ccSChris Mason 15090176260fSLinus Torvalds static int btrfs_freeze(struct super_block *sb) 1510ed0dab6bSYan { 1511815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1512815745cfSAl Viro mutex_lock(&fs_info->transaction_kthread_mutex); 1513815745cfSAl Viro mutex_lock(&fs_info->cleaner_mutex); 15140176260fSLinus Torvalds return 0; 1515ed0dab6bSYan } 1516ed0dab6bSYan 15170176260fSLinus Torvalds static int btrfs_unfreeze(struct super_block *sb) 1518ed0dab6bSYan { 1519815745cfSAl Viro struct btrfs_fs_info *fs_info = btrfs_sb(sb); 1520815745cfSAl Viro mutex_unlock(&fs_info->cleaner_mutex); 1521815745cfSAl Viro mutex_unlock(&fs_info->transaction_kthread_mutex); 15220176260fSLinus Torvalds return 0; 1523ed0dab6bSYan } 15242e635a27SChris Mason 15259c5085c1SJosef Bacik static int btrfs_show_devname(struct seq_file *m, struct dentry *root) 15269c5085c1SJosef Bacik { 15279c5085c1SJosef Bacik struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); 15289c5085c1SJosef Bacik struct btrfs_fs_devices *cur_devices; 15299c5085c1SJosef Bacik struct btrfs_device *dev, *first_dev = NULL; 15309c5085c1SJosef Bacik struct list_head *head; 15319c5085c1SJosef Bacik struct rcu_string *name; 15329c5085c1SJosef Bacik 15339c5085c1SJosef Bacik mutex_lock(&fs_info->fs_devices->device_list_mutex); 15349c5085c1SJosef Bacik cur_devices = fs_info->fs_devices; 15359c5085c1SJosef Bacik while (cur_devices) { 15369c5085c1SJosef Bacik head = &cur_devices->devices; 15379c5085c1SJosef Bacik list_for_each_entry(dev, head, dev_list) { 1538aa9ddcd4SJosef Bacik if (dev->missing) 1539aa9ddcd4SJosef Bacik continue; 15409c5085c1SJosef Bacik if (!first_dev || dev->devid < first_dev->devid) 15419c5085c1SJosef Bacik first_dev = dev; 15429c5085c1SJosef Bacik } 15439c5085c1SJosef Bacik cur_devices = cur_devices->seed; 15449c5085c1SJosef Bacik } 15459c5085c1SJosef Bacik 15469c5085c1SJosef Bacik if (first_dev) { 15479c5085c1SJosef Bacik rcu_read_lock(); 15489c5085c1SJosef Bacik name = rcu_dereference(first_dev->name); 15499c5085c1SJosef Bacik seq_escape(m, name->str, " \t\n\\"); 15509c5085c1SJosef Bacik rcu_read_unlock(); 15519c5085c1SJosef Bacik } else { 15529c5085c1SJosef Bacik WARN_ON(1); 15539c5085c1SJosef Bacik } 15549c5085c1SJosef Bacik mutex_unlock(&fs_info->fs_devices->device_list_mutex); 15559c5085c1SJosef Bacik return 0; 15569c5085c1SJosef Bacik } 15579c5085c1SJosef Bacik 1558b87221deSAlexey Dobriyan static const struct super_operations btrfs_super_ops = { 155976dda93cSYan, Zheng .drop_inode = btrfs_drop_inode, 1560bd555975SAl Viro .evict_inode = btrfs_evict_inode, 1561e20d96d6SChris Mason .put_super = btrfs_put_super, 1562d5719762SChris Mason .sync_fs = btrfs_sync_fs, 1563a9572a15SEric Paris .show_options = btrfs_show_options, 15649c5085c1SJosef Bacik .show_devname = btrfs_show_devname, 15654730a4bcSChris Mason .write_inode = btrfs_write_inode, 15662c90e5d6SChris Mason .alloc_inode = btrfs_alloc_inode, 15672c90e5d6SChris Mason .destroy_inode = btrfs_destroy_inode, 15688fd17795SChris Mason .statfs = btrfs_statfs, 1569c146afadSYan Zheng .remount_fs = btrfs_remount, 15700176260fSLinus Torvalds .freeze_fs = btrfs_freeze, 15710176260fSLinus Torvalds .unfreeze_fs = btrfs_unfreeze, 1572e20d96d6SChris Mason }; 1573a9218f6bSChris Mason 1574a9218f6bSChris Mason static const struct file_operations btrfs_ctl_fops = { 1575a9218f6bSChris Mason .unlocked_ioctl = btrfs_control_ioctl, 1576a9218f6bSChris Mason .compat_ioctl = btrfs_control_ioctl, 1577a9218f6bSChris Mason .owner = THIS_MODULE, 15786038f373SArnd Bergmann .llseek = noop_llseek, 1579a9218f6bSChris Mason }; 1580a9218f6bSChris Mason 1581a9218f6bSChris Mason static struct miscdevice btrfs_misc = { 1582578454ffSKay Sievers .minor = BTRFS_MINOR, 1583a9218f6bSChris Mason .name = "btrfs-control", 1584a9218f6bSChris Mason .fops = &btrfs_ctl_fops 1585a9218f6bSChris Mason }; 1586a9218f6bSChris Mason 1587578454ffSKay Sievers MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 1588578454ffSKay Sievers MODULE_ALIAS("devname:btrfs-control"); 1589578454ffSKay Sievers 1590a9218f6bSChris Mason static int btrfs_interface_init(void) 1591a9218f6bSChris Mason { 1592a9218f6bSChris Mason return misc_register(&btrfs_misc); 1593a9218f6bSChris Mason } 1594a9218f6bSChris Mason 1595b2950863SChristoph Hellwig static void btrfs_interface_exit(void) 1596a9218f6bSChris Mason { 1597a9218f6bSChris Mason if (misc_deregister(&btrfs_misc) < 0) 1598d397712bSChris Mason printk(KERN_INFO "misc_deregister failed for control device"); 1599a9218f6bSChris Mason } 1600a9218f6bSChris Mason 16012e635a27SChris Mason static int __init init_btrfs_fs(void) 16022e635a27SChris Mason { 16032c90e5d6SChris Mason int err; 160458176a96SJosef Bacik 160558176a96SJosef Bacik err = btrfs_init_sysfs(); 160658176a96SJosef Bacik if (err) 160758176a96SJosef Bacik return err; 160858176a96SJosef Bacik 1609143bede5SJeff Mahoney btrfs_init_compress(); 1610d1310b2eSChris Mason 1611261507a0SLi Zefan err = btrfs_init_cachep(); 1612261507a0SLi Zefan if (err) 1613261507a0SLi Zefan goto free_compress; 1614261507a0SLi Zefan 1615d1310b2eSChris Mason err = extent_io_init(); 16162f4cbe64SWyatt Banks if (err) 16172f4cbe64SWyatt Banks goto free_cachep; 16182f4cbe64SWyatt Banks 1619d1310b2eSChris Mason err = extent_map_init(); 1620d1310b2eSChris Mason if (err) 1621d1310b2eSChris Mason goto free_extent_io; 1622d1310b2eSChris Mason 1623*6352b91dSMiao Xie err = ordered_data_init(); 16242f4cbe64SWyatt Banks if (err) 16252f4cbe64SWyatt Banks goto free_extent_map; 1626c8b97818SChris Mason 1627*6352b91dSMiao Xie err = btrfs_delayed_inode_init(); 1628*6352b91dSMiao Xie if (err) 1629*6352b91dSMiao Xie goto free_ordered_data; 1630*6352b91dSMiao Xie 163116cdcec7SMiao Xie err = btrfs_interface_init(); 163216cdcec7SMiao Xie if (err) 163316cdcec7SMiao Xie goto free_delayed_inode; 163416cdcec7SMiao Xie 1635a9218f6bSChris Mason err = register_filesystem(&btrfs_fs_type); 1636a9218f6bSChris Mason if (err) 1637a9218f6bSChris Mason goto unregister_ioctl; 1638b3c3da71SChris Mason 1639e565d4b9SJan Schmidt btrfs_init_lockdep(); 1640e565d4b9SJan Schmidt 1641b3c3da71SChris Mason printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); 16422f4cbe64SWyatt Banks return 0; 16432f4cbe64SWyatt Banks 1644a9218f6bSChris Mason unregister_ioctl: 1645a9218f6bSChris Mason btrfs_interface_exit(); 164616cdcec7SMiao Xie free_delayed_inode: 164716cdcec7SMiao Xie btrfs_delayed_inode_exit(); 1648*6352b91dSMiao Xie free_ordered_data: 1649*6352b91dSMiao Xie ordered_data_exit(); 16502f4cbe64SWyatt Banks free_extent_map: 16512f4cbe64SWyatt Banks extent_map_exit(); 1652d1310b2eSChris Mason free_extent_io: 1653d1310b2eSChris Mason extent_io_exit(); 16542f4cbe64SWyatt Banks free_cachep: 16552f4cbe64SWyatt Banks btrfs_destroy_cachep(); 1656261507a0SLi Zefan free_compress: 1657261507a0SLi Zefan btrfs_exit_compress(); 16582f4cbe64SWyatt Banks btrfs_exit_sysfs(); 16592c90e5d6SChris Mason return err; 16602e635a27SChris Mason } 16612e635a27SChris Mason 16622e635a27SChris Mason static void __exit exit_btrfs_fs(void) 16632e635a27SChris Mason { 166439279cc3SChris Mason btrfs_destroy_cachep(); 166516cdcec7SMiao Xie btrfs_delayed_inode_exit(); 1666*6352b91dSMiao Xie ordered_data_exit(); 1667a52d9a80SChris Mason extent_map_exit(); 1668d1310b2eSChris Mason extent_io_exit(); 1669a9218f6bSChris Mason btrfs_interface_exit(); 16702e635a27SChris Mason unregister_filesystem(&btrfs_fs_type); 167158176a96SJosef Bacik btrfs_exit_sysfs(); 16728a4b83ccSChris Mason btrfs_cleanup_fs_uuids(); 1673261507a0SLi Zefan btrfs_exit_compress(); 16742e635a27SChris Mason } 16752e635a27SChris Mason 16762e635a27SChris Mason module_init(init_btrfs_fs) 16772e635a27SChris Mason module_exit(exit_btrfs_fs) 16782e635a27SChris Mason 16792e635a27SChris Mason MODULE_LICENSE("GPL"); 1680