1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Copyright (C) 2007 Oracle. All rights rese 3 * Copyright (C) 2007 Oracle. All rights reserved.
4 */ 4 */
5 5
6 #include <linux/blkdev.h> 6 #include <linux/blkdev.h>
7 #include <linux/module.h> 7 #include <linux/module.h>
8 #include <linux/fs.h> 8 #include <linux/fs.h>
9 #include <linux/pagemap.h> 9 #include <linux/pagemap.h>
10 #include <linux/highmem.h> 10 #include <linux/highmem.h>
11 #include <linux/time.h> 11 #include <linux/time.h>
12 #include <linux/init.h> 12 #include <linux/init.h>
13 #include <linux/seq_file.h> 13 #include <linux/seq_file.h>
14 #include <linux/string.h> 14 #include <linux/string.h>
15 #include <linux/backing-dev.h> 15 #include <linux/backing-dev.h>
16 #include <linux/mount.h> 16 #include <linux/mount.h>
17 #include <linux/writeback.h> 17 #include <linux/writeback.h>
18 #include <linux/statfs.h> 18 #include <linux/statfs.h>
19 #include <linux/compat.h> 19 #include <linux/compat.h>
20 #include <linux/parser.h> 20 #include <linux/parser.h>
21 #include <linux/ctype.h> 21 #include <linux/ctype.h>
22 #include <linux/namei.h> 22 #include <linux/namei.h>
23 #include <linux/miscdevice.h> 23 #include <linux/miscdevice.h>
24 #include <linux/magic.h> 24 #include <linux/magic.h>
25 #include <linux/slab.h> 25 #include <linux/slab.h>
26 #include <linux/ratelimit.h> 26 #include <linux/ratelimit.h>
27 #include <linux/crc32c.h> 27 #include <linux/crc32c.h>
28 #include <linux/btrfs.h> 28 #include <linux/btrfs.h>
29 #include <linux/security.h> <<
30 #include <linux/fs_parser.h> <<
31 #include <linux/swap.h> <<
32 #include "messages.h" <<
33 #include "delayed-inode.h" 29 #include "delayed-inode.h"
34 #include "ctree.h" 30 #include "ctree.h"
35 #include "disk-io.h" 31 #include "disk-io.h"
36 #include "transaction.h" 32 #include "transaction.h"
37 #include "btrfs_inode.h" 33 #include "btrfs_inode.h"
38 #include "direct-io.h" !! 34 #include "print-tree.h"
39 #include "props.h" 35 #include "props.h"
40 #include "xattr.h" 36 #include "xattr.h"
41 #include "bio.h" !! 37 #include "volumes.h"
42 #include "export.h" 38 #include "export.h"
43 #include "compression.h" 39 #include "compression.h"
>> 40 #include "rcu-string.h"
44 #include "dev-replace.h" 41 #include "dev-replace.h"
45 #include "free-space-cache.h" 42 #include "free-space-cache.h"
46 #include "backref.h" 43 #include "backref.h"
47 #include "space-info.h" 44 #include "space-info.h"
48 #include "sysfs.h" 45 #include "sysfs.h"
49 #include "zoned.h" 46 #include "zoned.h"
50 #include "tests/btrfs-tests.h" 47 #include "tests/btrfs-tests.h"
51 #include "block-group.h" 48 #include "block-group.h"
52 #include "discard.h" 49 #include "discard.h"
53 #include "qgroup.h" 50 #include "qgroup.h"
54 #include "raid56.h" <<
55 #include "fs.h" <<
56 #include "accessors.h" <<
57 #include "defrag.h" <<
58 #include "dir-item.h" <<
59 #include "ioctl.h" <<
60 #include "scrub.h" <<
61 #include "verity.h" <<
62 #include "super.h" <<
63 #include "extent-tree.h" <<
64 #define CREATE_TRACE_POINTS 51 #define CREATE_TRACE_POINTS
65 #include <trace/events/btrfs.h> 52 #include <trace/events/btrfs.h>
66 53
67 static const struct super_operations btrfs_sup 54 static const struct super_operations btrfs_super_ops;
>> 55
>> 56 /*
>> 57 * Types for mounting the default subvolume and a subvolume explicitly
>> 58 * requested by subvol=/path. That way the callchain is straightforward and we
>> 59 * don't have to play tricks with the mount options and recursive calls to
>> 60 * btrfs_mount.
>> 61 *
>> 62 * The new btrfs_root_fs_type also servers as a tag for the bdev_holder.
>> 63 */
68 static struct file_system_type btrfs_fs_type; 64 static struct file_system_type btrfs_fs_type;
>> 65 static struct file_system_type btrfs_root_fs_type;
69 66
70 static void btrfs_put_super(struct super_block !! 67 static int btrfs_remount(struct super_block *sb, int *flags, char *data);
>> 68
>> 69 #ifdef CONFIG_PRINTK
>> 70
>> 71 #define STATE_STRING_PREFACE ": state "
>> 72 #define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT)
>> 73
>> 74 /*
>> 75 * Characters to print to indicate error conditions or uncommon filesystem sate.
>> 76 * RO is not an error.
>> 77 */
>> 78 static const char fs_state_chars[] = {
>> 79 [BTRFS_FS_STATE_ERROR] = 'E',
>> 80 [BTRFS_FS_STATE_REMOUNTING] = 'M',
>> 81 [BTRFS_FS_STATE_RO] = 0,
>> 82 [BTRFS_FS_STATE_TRANS_ABORTED] = 'A',
>> 83 [BTRFS_FS_STATE_DEV_REPLACING] = 'R',
>> 84 [BTRFS_FS_STATE_DUMMY_FS_INFO] = 0,
>> 85 [BTRFS_FS_STATE_NO_CSUMS] = 'C',
>> 86 [BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L',
>> 87 };
>> 88
>> 89 static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf)
71 { 90 {
72 struct btrfs_fs_info *fs_info = btrfs_ !! 91 unsigned int bit;
>> 92 bool states_printed = false;
>> 93 unsigned long fs_state = READ_ONCE(info->fs_state);
>> 94 char *curr = buf;
73 95
74 btrfs_info(fs_info, "last unmount of f !! 96 memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE));
75 close_ctree(fs_info); !! 97 curr += sizeof(STATE_STRING_PREFACE) - 1;
>> 98
>> 99 for_each_set_bit(bit, &fs_state, sizeof(fs_state)) {
>> 100 WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT);
>> 101 if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) {
>> 102 *curr++ = fs_state_chars[bit];
>> 103 states_printed = true;
>> 104 }
>> 105 }
>> 106
>> 107 /* If no states were printed, reset the buffer */
>> 108 if (!states_printed)
>> 109 curr = buf;
>> 110
>> 111 *curr++ = 0;
76 } 112 }
>> 113 #endif
>> 114
>> 115 /*
>> 116 * Generally the error codes correspond to their respective errors, but there
>> 117 * are a few special cases.
>> 118 *
>> 119 * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
>> 120 * instance will return EUCLEAN if any of the blocks are corrupted in
>> 121 * a way that is problematic. We want to reserve EUCLEAN for these
>> 122 * sort of corruptions.
>> 123 *
>> 124 * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
>> 125 * need to use EROFS for this case. We will have no idea of the
>> 126 * original failure, that will have been reported at the time we tripped
>> 127 * over the error. Each subsequent error that doesn't have any context
>> 128 * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
>> 129 */
>> 130 const char * __attribute_const__ btrfs_decode_error(int errno)
>> 131 {
>> 132 char *errstr = "unknown";
77 133
78 /* Store the mount options related information !! 134 switch (errno) {
79 struct btrfs_fs_context { !! 135 case -ENOENT: /* -2 */
80 char *subvol_name; !! 136 errstr = "No such entry";
81 u64 subvol_objectid; !! 137 break;
82 u64 max_inline; !! 138 case -EIO: /* -5 */
83 u32 commit_interval; !! 139 errstr = "IO failure";
84 u32 metadata_ratio; !! 140 break;
85 u32 thread_pool_size; !! 141 case -ENOMEM: /* -12*/
86 unsigned long long mount_opt; !! 142 errstr = "Out of memory";
87 unsigned long compress_type:4; !! 143 break;
88 unsigned int compress_level; !! 144 case -EEXIST: /* -17 */
89 refcount_t refs; !! 145 errstr = "Object already exists";
>> 146 break;
>> 147 case -ENOSPC: /* -28 */
>> 148 errstr = "No space left";
>> 149 break;
>> 150 case -EROFS: /* -30 */
>> 151 errstr = "Readonly filesystem";
>> 152 break;
>> 153 case -EOPNOTSUPP: /* -95 */
>> 154 errstr = "Operation not supported";
>> 155 break;
>> 156 case -EUCLEAN: /* -117 */
>> 157 errstr = "Filesystem corrupted";
>> 158 break;
>> 159 case -EDQUOT: /* -122 */
>> 160 errstr = "Quota exceeded";
>> 161 break;
>> 162 }
>> 163
>> 164 return errstr;
>> 165 }
>> 166
>> 167 /*
>> 168 * __btrfs_handle_fs_error decodes expected errors from the caller and
>> 169 * invokes the appropriate error response.
>> 170 */
>> 171 __cold
>> 172 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
>> 173 unsigned int line, int errno, const char *fmt, ...)
>> 174 {
>> 175 struct super_block *sb = fs_info->sb;
>> 176 #ifdef CONFIG_PRINTK
>> 177 char statestr[STATE_STRING_BUF_LEN];
>> 178 const char *errstr;
>> 179 #endif
>> 180
>> 181 /*
>> 182 * Special case: if the error is EROFS, and we're already
>> 183 * under SB_RDONLY, then it is safe here.
>> 184 */
>> 185 if (errno == -EROFS && sb_rdonly(sb))
>> 186 return;
>> 187
>> 188 #ifdef CONFIG_PRINTK
>> 189 errstr = btrfs_decode_error(errno);
>> 190 btrfs_state_to_string(fs_info, statestr);
>> 191 if (fmt) {
>> 192 struct va_format vaf;
>> 193 va_list args;
>> 194
>> 195 va_start(args, fmt);
>> 196 vaf.fmt = fmt;
>> 197 vaf.va = &args;
>> 198
>> 199 pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n",
>> 200 sb->s_id, statestr, function, line, errno, errstr, &vaf);
>> 201 va_end(args);
>> 202 } else {
>> 203 pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n",
>> 204 sb->s_id, statestr, function, line, errno, errstr);
>> 205 }
>> 206 #endif
>> 207
>> 208 /*
>> 209 * Today we only save the error info to memory. Long term we'll
>> 210 * also send it down to the disk
>> 211 */
>> 212 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
>> 213
>> 214 /* Don't go through full error handling during mount */
>> 215 if (!(sb->s_flags & SB_BORN))
>> 216 return;
>> 217
>> 218 if (sb_rdonly(sb))
>> 219 return;
>> 220
>> 221 btrfs_discard_stop(fs_info);
>> 222
>> 223 /* btrfs handle error by forcing the filesystem readonly */
>> 224 btrfs_set_sb_rdonly(sb);
>> 225 btrfs_info(fs_info, "forced readonly");
>> 226 /*
>> 227 * Note that a running device replace operation is not canceled here
>> 228 * although there is no way to update the progress. It would add the
>> 229 * risk of a deadlock, therefore the canceling is omitted. The only
>> 230 * penalty is that some I/O remains active until the procedure
>> 231 * completes. The next time when the filesystem is mounted writable
>> 232 * again, the device replace operation continues.
>> 233 */
>> 234 }
>> 235
>> 236 #ifdef CONFIG_PRINTK
>> 237 static const char * const logtypes[] = {
>> 238 "emergency",
>> 239 "alert",
>> 240 "critical",
>> 241 "error",
>> 242 "warning",
>> 243 "notice",
>> 244 "info",
>> 245 "debug",
>> 246 };
>> 247
>> 248
>> 249 /*
>> 250 * Use one ratelimit state per log level so that a flood of less important
>> 251 * messages doesn't cause more important ones to be dropped.
>> 252 */
>> 253 static struct ratelimit_state printk_limits[] = {
>> 254 RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 255 RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 256 RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 257 RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 258 RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 259 RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 260 RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
>> 261 RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
90 }; 262 };
91 263
>> 264 void __cold btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
>> 265 {
>> 266 char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
>> 267 struct va_format vaf;
>> 268 va_list args;
>> 269 int kern_level;
>> 270 const char *type = logtypes[4];
>> 271 struct ratelimit_state *ratelimit = &printk_limits[4];
>> 272
>> 273 va_start(args, fmt);
>> 274
>> 275 while ((kern_level = printk_get_level(fmt)) != 0) {
>> 276 size_t size = printk_skip_level(fmt) - fmt;
>> 277
>> 278 if (kern_level >= '' && kern_level <= '7') {
>> 279 memcpy(lvl, fmt, size);
>> 280 lvl[size] = '\0';
>> 281 type = logtypes[kern_level - ''];
>> 282 ratelimit = &printk_limits[kern_level - ''];
>> 283 }
>> 284 fmt += size;
>> 285 }
>> 286
>> 287 vaf.fmt = fmt;
>> 288 vaf.va = &args;
>> 289
>> 290 if (__ratelimit(ratelimit)) {
>> 291 if (fs_info) {
>> 292 char statestr[STATE_STRING_BUF_LEN];
>> 293
>> 294 btrfs_state_to_string(fs_info, statestr);
>> 295 printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type,
>> 296 fs_info->sb->s_id, statestr, &vaf);
>> 297 } else {
>> 298 printk("%sBTRFS %s: %pV\n", lvl, type, &vaf);
>> 299 }
>> 300 }
>> 301
>> 302 va_end(args);
>> 303 }
>> 304 #endif
>> 305
>> 306 #if BITS_PER_LONG == 32
>> 307 void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info)
>> 308 {
>> 309 if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) {
>> 310 btrfs_warn(fs_info, "reaching 32bit limit for logical addresses");
>> 311 btrfs_warn(fs_info,
>> 312 "due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT",
>> 313 BTRFS_32BIT_MAX_FILE_SIZE >> 40);
>> 314 btrfs_warn(fs_info,
>> 315 "please consider upgrading to 64bit kernel/hardware");
>> 316 }
>> 317 }
>> 318
>> 319 void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info)
>> 320 {
>> 321 if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) {
>> 322 btrfs_err(fs_info, "reached 32bit limit for logical addresses");
>> 323 btrfs_err(fs_info,
>> 324 "due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed",
>> 325 BTRFS_32BIT_MAX_FILE_SIZE >> 40);
>> 326 btrfs_err(fs_info,
>> 327 "please consider upgrading to 64bit kernel/hardware");
>> 328 }
>> 329 }
>> 330 #endif
>> 331
>> 332 /*
>> 333 * We only mark the transaction aborted and then set the file system read-only.
>> 334 * This will prevent new transactions from starting or trying to join this
>> 335 * one.
>> 336 *
>> 337 * This means that error recovery at the call site is limited to freeing
>> 338 * any local memory allocations and passing the error code up without
>> 339 * further cleanup. The transaction should complete as it normally would
>> 340 * in the call path but will return -EIO.
>> 341 *
>> 342 * We'll complete the cleanup in btrfs_end_transaction and
>> 343 * btrfs_commit_transaction.
>> 344 */
>> 345 __cold
>> 346 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
>> 347 const char *function,
>> 348 unsigned int line, int errno)
>> 349 {
>> 350 struct btrfs_fs_info *fs_info = trans->fs_info;
>> 351
>> 352 WRITE_ONCE(trans->aborted, errno);
>> 353 WRITE_ONCE(trans->transaction->aborted, errno);
>> 354 /* Wake up anybody who may be waiting on this transaction */
>> 355 wake_up(&fs_info->transaction_wait);
>> 356 wake_up(&fs_info->transaction_blocked_wait);
>> 357 __btrfs_handle_fs_error(fs_info, function, line, errno, NULL);
>> 358 }
>> 359 /*
>> 360 * __btrfs_panic decodes unexpected, fatal errors from the caller,
>> 361 * issues an alert, and either panics or BUGs, depending on mount options.
>> 362 */
>> 363 __cold
>> 364 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
>> 365 unsigned int line, int errno, const char *fmt, ...)
>> 366 {
>> 367 char *s_id = "<unknown>";
>> 368 const char *errstr;
>> 369 struct va_format vaf = { .fmt = fmt };
>> 370 va_list args;
>> 371
>> 372 if (fs_info)
>> 373 s_id = fs_info->sb->s_id;
>> 374
>> 375 va_start(args, fmt);
>> 376 vaf.va = &args;
>> 377
>> 378 errstr = btrfs_decode_error(errno);
>> 379 if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
>> 380 panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
>> 381 s_id, function, line, &vaf, errno, errstr);
>> 382
>> 383 btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
>> 384 function, line, &vaf, errno, errstr);
>> 385 va_end(args);
>> 386 /* Caller calls BUG() */
>> 387 }
>> 388
>> 389 static void btrfs_put_super(struct super_block *sb)
>> 390 {
>> 391 close_ctree(btrfs_sb(sb));
>> 392 }
>> 393
92 enum { 394 enum {
93 Opt_acl, !! 395 Opt_acl, Opt_noacl,
94 Opt_clear_cache, 396 Opt_clear_cache,
95 Opt_commit_interval, 397 Opt_commit_interval,
96 Opt_compress, 398 Opt_compress,
97 Opt_compress_force, 399 Opt_compress_force,
98 Opt_compress_force_type, 400 Opt_compress_force_type,
99 Opt_compress_type, 401 Opt_compress_type,
100 Opt_degraded, 402 Opt_degraded,
101 Opt_device, 403 Opt_device,
102 Opt_fatal_errors, 404 Opt_fatal_errors,
103 Opt_flushoncommit, !! 405 Opt_flushoncommit, Opt_noflushoncommit,
104 Opt_max_inline, 406 Opt_max_inline,
105 Opt_barrier, !! 407 Opt_barrier, Opt_nobarrier,
106 Opt_datacow, !! 408 Opt_datacow, Opt_nodatacow,
107 Opt_datasum, !! 409 Opt_datasum, Opt_nodatasum,
108 Opt_defrag, !! 410 Opt_defrag, Opt_nodefrag,
109 Opt_discard, !! 411 Opt_discard, Opt_nodiscard,
110 Opt_discard_mode, 412 Opt_discard_mode,
>> 413 Opt_norecovery,
111 Opt_ratio, 414 Opt_ratio,
112 Opt_rescan_uuid_tree, 415 Opt_rescan_uuid_tree,
113 Opt_skip_balance, 416 Opt_skip_balance,
114 Opt_space_cache, !! 417 Opt_space_cache, Opt_no_space_cache,
115 Opt_space_cache_version, 418 Opt_space_cache_version,
116 Opt_ssd, !! 419 Opt_ssd, Opt_nossd,
117 Opt_ssd_spread, !! 420 Opt_ssd_spread, Opt_nossd_spread,
118 Opt_subvol, 421 Opt_subvol,
119 Opt_subvol_empty, 422 Opt_subvol_empty,
120 Opt_subvolid, 423 Opt_subvolid,
121 Opt_thread_pool, 424 Opt_thread_pool,
122 Opt_treelog, !! 425 Opt_treelog, Opt_notreelog,
123 Opt_user_subvol_rm_allowed, 426 Opt_user_subvol_rm_allowed,
124 Opt_norecovery, <<
125 427
126 /* Rescue options */ 428 /* Rescue options */
127 Opt_rescue, 429 Opt_rescue,
128 Opt_usebackuproot, 430 Opt_usebackuproot,
129 Opt_nologreplay, 431 Opt_nologreplay,
>> 432 Opt_ignorebadroots,
>> 433 Opt_ignoredatacsums,
>> 434 Opt_rescue_all,
>> 435
>> 436 /* Deprecated options */
>> 437 Opt_recovery,
>> 438 Opt_inode_cache, Opt_noinode_cache,
130 439
131 /* Debugging options */ 440 /* Debugging options */
132 Opt_enospc_debug, !! 441 Opt_check_integrity,
>> 442 Opt_check_integrity_including_extent_data,
>> 443 Opt_check_integrity_print_mask,
>> 444 Opt_enospc_debug, Opt_noenospc_debug,
133 #ifdef CONFIG_BTRFS_DEBUG 445 #ifdef CONFIG_BTRFS_DEBUG
134 Opt_fragment, Opt_fragment_data, Opt_f !! 446 Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
135 #endif 447 #endif
136 #ifdef CONFIG_BTRFS_FS_REF_VERIFY 448 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
137 Opt_ref_verify, 449 Opt_ref_verify,
138 #endif 450 #endif
139 Opt_err, 451 Opt_err,
140 }; 452 };
141 453
142 enum { !! 454 static const match_table_t tokens = {
143 Opt_fatal_errors_panic, !! 455 {Opt_acl, "acl"},
144 Opt_fatal_errors_bug, !! 456 {Opt_noacl, "noacl"},
145 }; !! 457 {Opt_clear_cache, "clear_cache"},
146 !! 458 {Opt_commit_interval, "commit=%u"},
147 static const struct constant_table btrfs_param !! 459 {Opt_compress, "compress"},
148 { "panic", Opt_fatal_errors_panic }, !! 460 {Opt_compress_type, "compress=%s"},
149 { "bug", Opt_fatal_errors_bug }, !! 461 {Opt_compress_force, "compress-force"},
150 {} !! 462 {Opt_compress_force_type, "compress-force=%s"},
151 }; !! 463 {Opt_degraded, "degraded"},
152 !! 464 {Opt_device, "device=%s"},
153 enum { !! 465 {Opt_fatal_errors, "fatal_errors=%s"},
154 Opt_discard_sync, !! 466 {Opt_flushoncommit, "flushoncommit"},
155 Opt_discard_async, !! 467 {Opt_noflushoncommit, "noflushoncommit"},
156 }; !! 468 {Opt_inode_cache, "inode_cache"},
157 !! 469 {Opt_noinode_cache, "noinode_cache"},
158 static const struct constant_table btrfs_param !! 470 {Opt_max_inline, "max_inline=%s"},
159 { "sync", Opt_discard_sync }, !! 471 {Opt_barrier, "barrier"},
160 { "async", Opt_discard_async }, !! 472 {Opt_nobarrier, "nobarrier"},
161 {} !! 473 {Opt_datacow, "datacow"},
162 }; !! 474 {Opt_nodatacow, "nodatacow"},
163 !! 475 {Opt_datasum, "datasum"},
164 enum { !! 476 {Opt_nodatasum, "nodatasum"},
165 Opt_space_cache_v1, !! 477 {Opt_defrag, "autodefrag"},
166 Opt_space_cache_v2, !! 478 {Opt_nodefrag, "noautodefrag"},
167 }; !! 479 {Opt_discard, "discard"},
168 !! 480 {Opt_discard_mode, "discard=%s"},
169 static const struct constant_table btrfs_param !! 481 {Opt_nodiscard, "nodiscard"},
170 { "v1", Opt_space_cache_v1 }, !! 482 {Opt_norecovery, "norecovery"},
171 { "v2", Opt_space_cache_v2 }, !! 483 {Opt_ratio, "metadata_ratio=%u"},
172 {} !! 484 {Opt_rescan_uuid_tree, "rescan_uuid_tree"},
173 }; !! 485 {Opt_skip_balance, "skip_balance"},
174 !! 486 {Opt_space_cache, "space_cache"},
175 enum { !! 487 {Opt_no_space_cache, "nospace_cache"},
176 Opt_rescue_usebackuproot, !! 488 {Opt_space_cache_version, "space_cache=%s"},
177 Opt_rescue_nologreplay, !! 489 {Opt_ssd, "ssd"},
178 Opt_rescue_ignorebadroots, !! 490 {Opt_nossd, "nossd"},
179 Opt_rescue_ignoredatacsums, !! 491 {Opt_ssd_spread, "ssd_spread"},
180 Opt_rescue_ignoremetacsums, !! 492 {Opt_nossd_spread, "nossd_spread"},
181 Opt_rescue_ignoresuperflags, !! 493 {Opt_subvol, "subvol=%s"},
182 Opt_rescue_parameter_all, !! 494 {Opt_subvol_empty, "subvol="},
183 }; !! 495 {Opt_subvolid, "subvolid=%s"},
184 !! 496 {Opt_thread_pool, "thread_pool=%u"},
185 static const struct constant_table btrfs_param !! 497 {Opt_treelog, "treelog"},
186 { "usebackuproot", Opt_rescue_usebacku !! 498 {Opt_notreelog, "notreelog"},
187 { "nologreplay", Opt_rescue_nologrepla !! 499 {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
188 { "ignorebadroots", Opt_rescue_ignoreb <<
189 { "ibadroots", Opt_rescue_ignorebadroo <<
190 { "ignoredatacsums", Opt_rescue_ignore <<
191 { "ignoremetacsums", Opt_rescue_ignore <<
192 { "ignoresuperflags", Opt_rescue_ignor <<
193 { "idatacsums", Opt_rescue_ignoredatac <<
194 { "imetacsums", Opt_rescue_ignoremetac <<
195 { "isuperflags", Opt_rescue_ignoresupe <<
196 { "all", Opt_rescue_parameter_all }, <<
197 {} <<
198 }; <<
199 500
200 #ifdef CONFIG_BTRFS_DEBUG !! 501 /* Rescue options */
201 enum { !! 502 {Opt_rescue, "rescue=%s"},
202 Opt_fragment_parameter_data, <<
203 Opt_fragment_parameter_metadata, <<
204 Opt_fragment_parameter_all, <<
205 }; <<
206 <<
207 static const struct constant_table btrfs_param <<
208 { "data", Opt_fragment_parameter_data <<
209 { "metadata", Opt_fragment_parameter_m <<
210 { "all", Opt_fragment_parameter_all }, <<
211 {} <<
212 }; <<
213 #endif <<
214 <<
215 static const struct fs_parameter_spec btrfs_fs <<
216 fsparam_flag_no("acl", Opt_acl), <<
217 fsparam_flag_no("autodefrag", Opt_defr <<
218 fsparam_flag_no("barrier", Opt_barrier <<
219 fsparam_flag("clear_cache", Opt_clear_ <<
220 fsparam_u32("commit", Opt_commit_inter <<
221 fsparam_flag("compress", Opt_compress) <<
222 fsparam_string("compress", Opt_compres <<
223 fsparam_flag("compress-force", Opt_com <<
224 fsparam_string("compress-force", Opt_c <<
225 fsparam_flag_no("datacow", Opt_datacow <<
226 fsparam_flag_no("datasum", Opt_datasum <<
227 fsparam_flag("degraded", Opt_degraded) <<
228 fsparam_string("device", Opt_device), <<
229 fsparam_flag_no("discard", Opt_discard <<
230 fsparam_enum("discard", Opt_discard_mo <<
231 fsparam_enum("fatal_errors", Opt_fatal <<
232 fsparam_flag_no("flushoncommit", Opt_f <<
233 fsparam_string("max_inline", Opt_max_i <<
234 fsparam_u32("metadata_ratio", Opt_rati <<
235 fsparam_flag("rescan_uuid_tree", Opt_r <<
236 fsparam_flag("skip_balance", Opt_skip_ <<
237 fsparam_flag_no("space_cache", Opt_spa <<
238 fsparam_enum("space_cache", Opt_space_ <<
239 fsparam_flag_no("ssd", Opt_ssd), <<
240 fsparam_flag_no("ssd_spread", Opt_ssd_ <<
241 fsparam_string("subvol", Opt_subvol), <<
242 fsparam_flag("subvol=", Opt_subvol_emp <<
243 fsparam_u64("subvolid", Opt_subvolid), <<
244 fsparam_u32("thread_pool", Opt_thread_ <<
245 fsparam_flag_no("treelog", Opt_treelog <<
246 fsparam_flag("user_subvol_rm_allowed", <<
247 <<
248 /* Rescue options. */ <<
249 fsparam_enum("rescue", Opt_rescue, btr <<
250 /* Deprecated, with alias rescue=nolog 503 /* Deprecated, with alias rescue=nologreplay */
251 __fsparam(NULL, "nologreplay", Opt_nol !! 504 {Opt_nologreplay, "nologreplay"},
252 /* Deprecated, with alias rescue=useba 505 /* Deprecated, with alias rescue=usebackuproot */
253 __fsparam(NULL, "usebackuproot", Opt_u !! 506 {Opt_usebackuproot, "usebackuproot"},
254 /* For compatibility only, alias for " !! 507
255 fsparam_flag("norecovery", Opt_norecov !! 508 /* Deprecated options */
>> 509 {Opt_recovery, "recovery"},
256 510
257 /* Debugging options. */ !! 511 /* Debugging options */
258 fsparam_flag_no("enospc_debug", Opt_en !! 512 {Opt_check_integrity, "check_int"},
>> 513 {Opt_check_integrity_including_extent_data, "check_int_data"},
>> 514 {Opt_check_integrity_print_mask, "check_int_print_mask=%u"},
>> 515 {Opt_enospc_debug, "enospc_debug"},
>> 516 {Opt_noenospc_debug, "noenospc_debug"},
259 #ifdef CONFIG_BTRFS_DEBUG 517 #ifdef CONFIG_BTRFS_DEBUG
260 fsparam_enum("fragment", Opt_fragment, !! 518 {Opt_fragment_data, "fragment=data"},
>> 519 {Opt_fragment_metadata, "fragment=metadata"},
>> 520 {Opt_fragment_all, "fragment=all"},
261 #endif 521 #endif
262 #ifdef CONFIG_BTRFS_FS_REF_VERIFY 522 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
263 fsparam_flag("ref_verify", Opt_ref_ver !! 523 {Opt_ref_verify, "ref_verify"},
264 #endif 524 #endif
265 {} !! 525 {Opt_err, NULL},
>> 526 };
>> 527
>> 528 static const match_table_t rescue_tokens = {
>> 529 {Opt_usebackuproot, "usebackuproot"},
>> 530 {Opt_nologreplay, "nologreplay"},
>> 531 {Opt_ignorebadroots, "ignorebadroots"},
>> 532 {Opt_ignorebadroots, "ibadroots"},
>> 533 {Opt_ignoredatacsums, "ignoredatacsums"},
>> 534 {Opt_ignoredatacsums, "idatacsums"},
>> 535 {Opt_rescue_all, "all"},
>> 536 {Opt_err, NULL},
266 }; 537 };
267 538
268 /* No support for restricting writes to btrfs !! 539 static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt,
269 static inline blk_mode_t btrfs_open_mode(struc !! 540 const char *opt_name)
270 { 541 {
271 return sb_open_mode(fc->sb_flags) & ~B !! 542 if (fs_info->mount_opt & opt) {
>> 543 btrfs_err(fs_info, "%s must be used with ro mount option",
>> 544 opt_name);
>> 545 return true;
>> 546 }
>> 547 return false;
272 } 548 }
273 549
274 static int btrfs_parse_param(struct fs_context !! 550 static int parse_rescue_options(struct btrfs_fs_info *info, const char *options)
275 { 551 {
276 struct btrfs_fs_context *ctx = fc->fs_ !! 552 char *opts;
277 struct fs_parse_result result; !! 553 char *orig;
278 int opt; !! 554 char *p;
>> 555 substring_t args[MAX_OPT_ARGS];
>> 556 int ret = 0;
279 557
280 opt = fs_parse(fc, btrfs_fs_parameters !! 558 opts = kstrdup(options, GFP_KERNEL);
281 if (opt < 0) !! 559 if (!opts)
282 return opt; !! 560 return -ENOMEM;
>> 561 orig = opts;
283 562
284 switch (opt) { !! 563 while ((p = strsep(&opts, ":")) != NULL) {
285 case Opt_degraded: !! 564 int token;
286 btrfs_set_opt(ctx->mount_opt, <<
287 break; <<
288 case Opt_subvol_empty: <<
289 /* <<
290 * This exists because we used <<
291 * keeping it to maintain ABI. <<
292 * empty subvol= again"). <<
293 */ <<
294 break; <<
295 case Opt_subvol: <<
296 kfree(ctx->subvol_name); <<
297 ctx->subvol_name = kstrdup(par <<
298 if (!ctx->subvol_name) <<
299 return -ENOMEM; <<
300 break; <<
301 case Opt_subvolid: <<
302 ctx->subvol_objectid = result. <<
303 565
304 /* subvolid=0 means give me th !! 566 if (!*p)
305 if (!ctx->subvol_objectid) !! 567 continue;
306 ctx->subvol_objectid = !! 568 token = match_token(p, rescue_tokens, args);
307 break; !! 569 switch (token){
308 case Opt_device: { !! 570 case Opt_usebackuproot:
309 struct btrfs_device *device; !! 571 btrfs_info(info,
310 blk_mode_t mode = btrfs_open_m !! 572 "trying to use backup root at mount time");
>> 573 btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
>> 574 break;
>> 575 case Opt_nologreplay:
>> 576 btrfs_set_and_info(info, NOLOGREPLAY,
>> 577 "disabling log replay at mount time");
>> 578 break;
>> 579 case Opt_ignorebadroots:
>> 580 btrfs_set_and_info(info, IGNOREBADROOTS,
>> 581 "ignoring bad roots");
>> 582 break;
>> 583 case Opt_ignoredatacsums:
>> 584 btrfs_set_and_info(info, IGNOREDATACSUMS,
>> 585 "ignoring data csums");
>> 586 break;
>> 587 case Opt_rescue_all:
>> 588 btrfs_info(info, "enabling all of the rescue options");
>> 589 btrfs_set_and_info(info, IGNOREDATACSUMS,
>> 590 "ignoring data csums");
>> 591 btrfs_set_and_info(info, IGNOREBADROOTS,
>> 592 "ignoring bad roots");
>> 593 btrfs_set_and_info(info, NOLOGREPLAY,
>> 594 "disabling log replay at mount time");
>> 595 break;
>> 596 case Opt_err:
>> 597 btrfs_info(info, "unrecognized rescue option '%s'", p);
>> 598 ret = -EINVAL;
>> 599 goto out;
>> 600 default:
>> 601 break;
>> 602 }
311 603
312 mutex_lock(&uuid_mutex); <<
313 device = btrfs_scan_one_device <<
314 mutex_unlock(&uuid_mutex); <<
315 if (IS_ERR(device)) <<
316 return PTR_ERR(device) <<
317 break; <<
318 } 604 }
319 case Opt_datasum: !! 605 out:
320 if (result.negated) { !! 606 kfree(orig);
321 btrfs_set_opt(ctx->mou !! 607 return ret;
322 } else { !! 608 }
323 btrfs_clear_opt(ctx->m <<
324 btrfs_clear_opt(ctx->m <<
325 } <<
326 break; <<
327 case Opt_datacow: <<
328 if (result.negated) { <<
329 btrfs_clear_opt(ctx->m <<
330 btrfs_clear_opt(ctx->m <<
331 btrfs_set_opt(ctx->mou <<
332 btrfs_set_opt(ctx->mou <<
333 } else { <<
334 btrfs_clear_opt(ctx->m <<
335 } <<
336 break; <<
337 case Opt_compress_force: <<
338 case Opt_compress_force_type: <<
339 btrfs_set_opt(ctx->mount_opt, <<
340 fallthrough; <<
341 case Opt_compress: <<
342 case Opt_compress_type: <<
343 /* <<
344 * Provide the same semantics <<
345 * context, specifying the "co <<
346 * "force-compress" without th <<
347 * "compress-force=[no|none]" <<
348 */ <<
349 if (opt != Opt_compress_force <<
350 btrfs_clear_opt(ctx->m <<
351 609
352 if (opt == Opt_compress || opt !! 610 /*
353 ctx->compress_type = B !! 611 * Regular mount options parser. Everything that is needed only when
354 ctx->compress_level = !! 612 * reading in a new superblock is parsed here.
355 btrfs_set_opt(ctx->mou !! 613 * XXX JDM: This needs to be cleaned up for remount.
356 btrfs_clear_opt(ctx->m !! 614 */
357 btrfs_clear_opt(ctx->m !! 615 int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
358 } else if (strncmp(param->stri !! 616 unsigned long new_flags)
359 ctx->compress_type = B !! 617 {
360 ctx->compress_level = !! 618 substring_t args[MAX_OPT_ARGS];
361 btrfs_compress !! 619 char *p, *num;
362 !! 620 int intarg;
363 btrfs_set_opt(ctx->mou !! 621 int ret = 0;
364 btrfs_clear_opt(ctx->m !! 622 char *compress_type;
365 btrfs_clear_opt(ctx->m !! 623 bool compress_force = false;
366 } else if (strncmp(param->stri !! 624 enum btrfs_compression_type saved_compress_type;
367 ctx->compress_type = B !! 625 int saved_compress_level;
368 ctx->compress_level = !! 626 bool saved_compress_force;
369 btrfs_set_opt(ctx->mou !! 627 int no_compress = 0;
370 btrfs_clear_opt(ctx->m !! 628
371 btrfs_clear_opt(ctx->m !! 629 if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
372 } else if (strncmp(param->stri !! 630 btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
373 ctx->compress_type = B !! 631 else if (btrfs_free_space_cache_v1_active(info)) {
374 ctx->compress_level = !! 632 if (btrfs_is_zoned(info)) {
375 btrfs_compress !! 633 btrfs_info(info,
376 !! 634 "zoned: clearing existing space cache");
377 btrfs_set_opt(ctx->mou !! 635 btrfs_set_super_cache_generation(info->super_copy, 0);
378 btrfs_clear_opt(ctx->m <<
379 btrfs_clear_opt(ctx->m <<
380 } else if (strncmp(param->stri <<
381 ctx->compress_level = <<
382 ctx->compress_type = 0 <<
383 btrfs_clear_opt(ctx->m <<
384 btrfs_clear_opt(ctx->m <<
385 } else { <<
386 btrfs_err(NULL, "unrec <<
387 param->strin <<
388 return -EINVAL; <<
389 } <<
390 break; <<
391 case Opt_ssd: <<
392 if (result.negated) { <<
393 btrfs_set_opt(ctx->mou <<
394 btrfs_clear_opt(ctx->m <<
395 btrfs_clear_opt(ctx->m <<
396 } else { <<
397 btrfs_set_opt(ctx->mou <<
398 btrfs_clear_opt(ctx->m <<
399 } <<
400 break; <<
401 case Opt_ssd_spread: <<
402 if (result.negated) { <<
403 btrfs_clear_opt(ctx->m <<
404 } else { 636 } else {
405 btrfs_set_opt(ctx->mou !! 637 btrfs_set_opt(info->mount_opt, SPACE_CACHE);
406 btrfs_set_opt(ctx->mou <<
407 btrfs_clear_opt(ctx->m <<
408 } 638 }
409 break; !! 639 }
410 case Opt_barrier: !! 640
411 if (result.negated) !! 641 /*
412 btrfs_set_opt(ctx->mou !! 642 * Even the options are empty, we still need to do extra check
413 else !! 643 * against new flags
414 btrfs_clear_opt(ctx->m !! 644 */
415 break; !! 645 if (!options)
416 case Opt_thread_pool: !! 646 goto check;
417 if (result.uint_32 == 0) { !! 647
418 btrfs_err(NULL, "inval !! 648 while ((p = strsep(&options, ",")) != NULL) {
419 return -EINVAL; !! 649 int token;
420 } !! 650 if (!*p)
421 ctx->thread_pool_size = result !! 651 continue;
422 break; !! 652
423 case Opt_max_inline: !! 653 token = match_token(p, tokens, args);
424 ctx->max_inline = memparse(par !! 654 switch (token) {
425 break; !! 655 case Opt_degraded:
426 case Opt_acl: !! 656 btrfs_info(info, "allowing degraded mounts");
427 if (result.negated) { !! 657 btrfs_set_opt(info->mount_opt, DEGRADED);
428 fc->sb_flags &= ~SB_PO !! 658 break;
429 } else { !! 659 case Opt_subvol:
>> 660 case Opt_subvol_empty:
>> 661 case Opt_subvolid:
>> 662 case Opt_device:
>> 663 /*
>> 664 * These are parsed by btrfs_parse_subvol_options or
>> 665 * btrfs_parse_device_options and can be ignored here.
>> 666 */
>> 667 break;
>> 668 case Opt_nodatasum:
>> 669 btrfs_set_and_info(info, NODATASUM,
>> 670 "setting nodatasum");
>> 671 break;
>> 672 case Opt_datasum:
>> 673 if (btrfs_test_opt(info, NODATASUM)) {
>> 674 if (btrfs_test_opt(info, NODATACOW))
>> 675 btrfs_info(info,
>> 676 "setting datasum, datacow enabled");
>> 677 else
>> 678 btrfs_info(info, "setting datasum");
>> 679 }
>> 680 btrfs_clear_opt(info->mount_opt, NODATACOW);
>> 681 btrfs_clear_opt(info->mount_opt, NODATASUM);
>> 682 break;
>> 683 case Opt_nodatacow:
>> 684 if (!btrfs_test_opt(info, NODATACOW)) {
>> 685 if (!btrfs_test_opt(info, COMPRESS) ||
>> 686 !btrfs_test_opt(info, FORCE_COMPRESS)) {
>> 687 btrfs_info(info,
>> 688 "setting nodatacow, compression disabled");
>> 689 } else {
>> 690 btrfs_info(info, "setting nodatacow");
>> 691 }
>> 692 }
>> 693 btrfs_clear_opt(info->mount_opt, COMPRESS);
>> 694 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
>> 695 btrfs_set_opt(info->mount_opt, NODATACOW);
>> 696 btrfs_set_opt(info->mount_opt, NODATASUM);
>> 697 break;
>> 698 case Opt_datacow:
>> 699 btrfs_clear_and_info(info, NODATACOW,
>> 700 "setting datacow");
>> 701 break;
>> 702 case Opt_compress_force:
>> 703 case Opt_compress_force_type:
>> 704 compress_force = true;
>> 705 fallthrough;
>> 706 case Opt_compress:
>> 707 case Opt_compress_type:
>> 708 saved_compress_type = btrfs_test_opt(info,
>> 709 COMPRESS) ?
>> 710 info->compress_type : BTRFS_COMPRESS_NONE;
>> 711 saved_compress_force =
>> 712 btrfs_test_opt(info, FORCE_COMPRESS);
>> 713 saved_compress_level = info->compress_level;
>> 714 if (token == Opt_compress ||
>> 715 token == Opt_compress_force ||
>> 716 strncmp(args[0].from, "zlib", 4) == 0) {
>> 717 compress_type = "zlib";
>> 718
>> 719 info->compress_type = BTRFS_COMPRESS_ZLIB;
>> 720 info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL;
>> 721 /*
>> 722 * args[0] contains uninitialized data since
>> 723 * for these tokens we don't expect any
>> 724 * parameter.
>> 725 */
>> 726 if (token != Opt_compress &&
>> 727 token != Opt_compress_force)
>> 728 info->compress_level =
>> 729 btrfs_compress_str2level(
>> 730 BTRFS_COMPRESS_ZLIB,
>> 731 args[0].from + 4);
>> 732 btrfs_set_opt(info->mount_opt, COMPRESS);
>> 733 btrfs_clear_opt(info->mount_opt, NODATACOW);
>> 734 btrfs_clear_opt(info->mount_opt, NODATASUM);
>> 735 no_compress = 0;
>> 736 } else if (strncmp(args[0].from, "lzo", 3) == 0) {
>> 737 compress_type = "lzo";
>> 738 info->compress_type = BTRFS_COMPRESS_LZO;
>> 739 info->compress_level = 0;
>> 740 btrfs_set_opt(info->mount_opt, COMPRESS);
>> 741 btrfs_clear_opt(info->mount_opt, NODATACOW);
>> 742 btrfs_clear_opt(info->mount_opt, NODATASUM);
>> 743 btrfs_set_fs_incompat(info, COMPRESS_LZO);
>> 744 no_compress = 0;
>> 745 } else if (strncmp(args[0].from, "zstd", 4) == 0) {
>> 746 compress_type = "zstd";
>> 747 info->compress_type = BTRFS_COMPRESS_ZSTD;
>> 748 info->compress_level =
>> 749 btrfs_compress_str2level(
>> 750 BTRFS_COMPRESS_ZSTD,
>> 751 args[0].from + 4);
>> 752 btrfs_set_opt(info->mount_opt, COMPRESS);
>> 753 btrfs_clear_opt(info->mount_opt, NODATACOW);
>> 754 btrfs_clear_opt(info->mount_opt, NODATASUM);
>> 755 btrfs_set_fs_incompat(info, COMPRESS_ZSTD);
>> 756 no_compress = 0;
>> 757 } else if (strncmp(args[0].from, "no", 2) == 0) {
>> 758 compress_type = "no";
>> 759 info->compress_level = 0;
>> 760 info->compress_type = 0;
>> 761 btrfs_clear_opt(info->mount_opt, COMPRESS);
>> 762 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
>> 763 compress_force = false;
>> 764 no_compress++;
>> 765 } else {
>> 766 btrfs_err(info, "unrecognized compression value %s",
>> 767 args[0].from);
>> 768 ret = -EINVAL;
>> 769 goto out;
>> 770 }
>> 771
>> 772 if (compress_force) {
>> 773 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
>> 774 } else {
>> 775 /*
>> 776 * If we remount from compress-force=xxx to
>> 777 * compress=xxx, we need clear FORCE_COMPRESS
>> 778 * flag, otherwise, there is no way for users
>> 779 * to disable forcible compression separately.
>> 780 */
>> 781 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
>> 782 }
>> 783 if (no_compress == 1) {
>> 784 btrfs_info(info, "use no compression");
>> 785 } else if ((info->compress_type != saved_compress_type) ||
>> 786 (compress_force != saved_compress_force) ||
>> 787 (info->compress_level != saved_compress_level)) {
>> 788 btrfs_info(info, "%s %s compression, level %d",
>> 789 (compress_force) ? "force" : "use",
>> 790 compress_type, info->compress_level);
>> 791 }
>> 792 compress_force = false;
>> 793 break;
>> 794 case Opt_ssd:
>> 795 btrfs_set_and_info(info, SSD,
>> 796 "enabling ssd optimizations");
>> 797 btrfs_clear_opt(info->mount_opt, NOSSD);
>> 798 break;
>> 799 case Opt_ssd_spread:
>> 800 btrfs_set_and_info(info, SSD,
>> 801 "enabling ssd optimizations");
>> 802 btrfs_set_and_info(info, SSD_SPREAD,
>> 803 "using spread ssd allocation scheme");
>> 804 btrfs_clear_opt(info->mount_opt, NOSSD);
>> 805 break;
>> 806 case Opt_nossd:
>> 807 btrfs_set_opt(info->mount_opt, NOSSD);
>> 808 btrfs_clear_and_info(info, SSD,
>> 809 "not using ssd optimizations");
>> 810 fallthrough;
>> 811 case Opt_nossd_spread:
>> 812 btrfs_clear_and_info(info, SSD_SPREAD,
>> 813 "not using spread ssd allocation scheme");
>> 814 break;
>> 815 case Opt_barrier:
>> 816 btrfs_clear_and_info(info, NOBARRIER,
>> 817 "turning on barriers");
>> 818 break;
>> 819 case Opt_nobarrier:
>> 820 btrfs_set_and_info(info, NOBARRIER,
>> 821 "turning off barriers");
>> 822 break;
>> 823 case Opt_thread_pool:
>> 824 ret = match_int(&args[0], &intarg);
>> 825 if (ret) {
>> 826 btrfs_err(info, "unrecognized thread_pool value %s",
>> 827 args[0].from);
>> 828 goto out;
>> 829 } else if (intarg == 0) {
>> 830 btrfs_err(info, "invalid value 0 for thread_pool");
>> 831 ret = -EINVAL;
>> 832 goto out;
>> 833 }
>> 834 info->thread_pool_size = intarg;
>> 835 break;
>> 836 case Opt_max_inline:
>> 837 num = match_strdup(&args[0]);
>> 838 if (num) {
>> 839 info->max_inline = memparse(num, NULL);
>> 840 kfree(num);
>> 841
>> 842 if (info->max_inline) {
>> 843 info->max_inline = min_t(u64,
>> 844 info->max_inline,
>> 845 info->sectorsize);
>> 846 }
>> 847 btrfs_info(info, "max_inline at %llu",
>> 848 info->max_inline);
>> 849 } else {
>> 850 ret = -ENOMEM;
>> 851 goto out;
>> 852 }
>> 853 break;
>> 854 case Opt_acl:
430 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 855 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
431 fc->sb_flags |= SB_POS !! 856 info->sb->s_flags |= SB_POSIXACL;
>> 857 break;
432 #else 858 #else
433 btrfs_err(NULL, "suppo !! 859 btrfs_err(info, "support for ACL not compiled in!");
434 return -EINVAL; !! 860 ret = -EINVAL;
>> 861 goto out;
435 #endif 862 #endif
436 } !! 863 case Opt_noacl:
437 /* !! 864 info->sb->s_flags &= ~SB_POSIXACL;
438 * VFS limits the ability to t !! 865 break;
439 * despite every file system a !! 866 case Opt_notreelog:
440 * an oversight since we all d !! 867 btrfs_set_and_info(info, NOTREELOG,
441 * remounting. So don't set t !! 868 "disabling tree log");
442 * btrfs_reconfigure and do th !! 869 break;
443 */ !! 870 case Opt_treelog:
444 if (fc->purpose != FS_CONTEXT_ !! 871 btrfs_clear_and_info(info, NOTREELOG,
445 fc->sb_flags_mask |= S !! 872 "enabling tree log");
446 break; !! 873 break;
447 case Opt_treelog: !! 874 case Opt_norecovery:
448 if (result.negated) !! 875 case Opt_nologreplay:
449 btrfs_set_opt(ctx->mou !! 876 btrfs_warn(info,
450 else <<
451 btrfs_clear_opt(ctx->m <<
452 break; <<
453 case Opt_nologreplay: <<
454 btrfs_warn(NULL, <<
455 "'nologreplay' is deprecated, 877 "'nologreplay' is deprecated, use 'rescue=nologreplay' instead");
456 btrfs_set_opt(ctx->mount_opt, !! 878 btrfs_set_and_info(info, NOLOGREPLAY,
457 break; !! 879 "disabling log replay at mount time");
458 case Opt_norecovery: <<
459 btrfs_info(NULL, <<
460 "'norecovery' is for compatibility only, recom <<
461 btrfs_set_opt(ctx->mount_opt, <<
462 break; <<
463 case Opt_flushoncommit: <<
464 if (result.negated) <<
465 btrfs_clear_opt(ctx->m <<
466 else <<
467 btrfs_set_opt(ctx->mou <<
468 break; <<
469 case Opt_ratio: <<
470 ctx->metadata_ratio = result.u <<
471 break; <<
472 case Opt_discard: <<
473 if (result.negated) { <<
474 btrfs_clear_opt(ctx->m <<
475 btrfs_clear_opt(ctx->m <<
476 btrfs_set_opt(ctx->mou <<
477 } else { <<
478 btrfs_set_opt(ctx->mou <<
479 btrfs_clear_opt(ctx->m <<
480 } <<
481 break; <<
482 case Opt_discard_mode: <<
483 switch (result.uint_32) { <<
484 case Opt_discard_sync: <<
485 btrfs_clear_opt(ctx->m <<
486 btrfs_set_opt(ctx->mou <<
487 break; <<
488 case Opt_discard_async: <<
489 btrfs_clear_opt(ctx->m <<
490 btrfs_set_opt(ctx->mou <<
491 break; 880 break;
492 default: !! 881 case Opt_flushoncommit:
493 btrfs_err(NULL, "unrec !! 882 btrfs_set_and_info(info, FLUSHONCOMMIT,
494 param->key); !! 883 "turning on flush-on-commit");
495 return -EINVAL; <<
496 } <<
497 btrfs_clear_opt(ctx->mount_opt <<
498 break; <<
499 case Opt_space_cache: <<
500 if (result.negated) { <<
501 btrfs_set_opt(ctx->mou <<
502 btrfs_clear_opt(ctx->m <<
503 btrfs_clear_opt(ctx->m <<
504 } else { <<
505 btrfs_clear_opt(ctx->m <<
506 btrfs_set_opt(ctx->mou <<
507 } <<
508 break; <<
509 case Opt_space_cache_version: <<
510 switch (result.uint_32) { <<
511 case Opt_space_cache_v1: <<
512 btrfs_set_opt(ctx->mou <<
513 btrfs_clear_opt(ctx->m <<
514 break; <<
515 case Opt_space_cache_v2: <<
516 btrfs_clear_opt(ctx->m <<
517 btrfs_set_opt(ctx->mou <<
518 break; 884 break;
519 default: !! 885 case Opt_noflushoncommit:
520 btrfs_err(NULL, "unrec !! 886 btrfs_clear_and_info(info, FLUSHONCOMMIT,
521 param->key); !! 887 "turning off flush-on-commit");
522 return -EINVAL; <<
523 } <<
524 break; <<
525 case Opt_rescan_uuid_tree: <<
526 btrfs_set_opt(ctx->mount_opt, <<
527 break; <<
528 case Opt_clear_cache: <<
529 btrfs_set_opt(ctx->mount_opt, <<
530 break; <<
531 case Opt_user_subvol_rm_allowed: <<
532 btrfs_set_opt(ctx->mount_opt, <<
533 break; <<
534 case Opt_enospc_debug: <<
535 if (result.negated) <<
536 btrfs_clear_opt(ctx->m <<
537 else <<
538 btrfs_set_opt(ctx->mou <<
539 break; <<
540 case Opt_defrag: <<
541 if (result.negated) <<
542 btrfs_clear_opt(ctx->m <<
543 else <<
544 btrfs_set_opt(ctx->mou <<
545 break; <<
546 case Opt_usebackuproot: <<
547 btrfs_warn(NULL, <<
548 "'usebackuproot' is <<
549 btrfs_set_opt(ctx->mount_opt, <<
550 <<
551 /* If we're loading the backup <<
552 btrfs_set_opt(ctx->mount_opt, <<
553 break; <<
554 case Opt_skip_balance: <<
555 btrfs_set_opt(ctx->mount_opt, <<
556 break; <<
557 case Opt_fatal_errors: <<
558 switch (result.uint_32) { <<
559 case Opt_fatal_errors_panic: <<
560 btrfs_set_opt(ctx->mou <<
561 break; 888 break;
562 case Opt_fatal_errors_bug: !! 889 case Opt_ratio:
563 btrfs_clear_opt(ctx->m !! 890 ret = match_int(&args[0], &intarg);
>> 891 if (ret) {
>> 892 btrfs_err(info, "unrecognized metadata_ratio value %s",
>> 893 args[0].from);
>> 894 goto out;
>> 895 }
>> 896 info->metadata_ratio = intarg;
>> 897 btrfs_info(info, "metadata ratio %u",
>> 898 info->metadata_ratio);
564 break; 899 break;
565 default: !! 900 case Opt_discard:
566 btrfs_err(NULL, "unrec !! 901 case Opt_discard_mode:
567 param->key); !! 902 if (token == Opt_discard ||
568 return -EINVAL; !! 903 strcmp(args[0].from, "sync") == 0) {
569 } !! 904 btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC);
570 break; !! 905 btrfs_set_and_info(info, DISCARD_SYNC,
571 case Opt_commit_interval: !! 906 "turning on sync discard");
572 ctx->commit_interval = result. !! 907 } else if (strcmp(args[0].from, "async") == 0) {
573 if (ctx->commit_interval == 0) !! 908 btrfs_clear_opt(info->mount_opt, DISCARD_SYNC);
574 ctx->commit_interval = !! 909 btrfs_set_and_info(info, DISCARD_ASYNC,
575 break; !! 910 "turning on async discard");
576 case Opt_rescue: !! 911 } else {
577 switch (result.uint_32) { !! 912 btrfs_err(info, "unrecognized discard mode value %s",
578 case Opt_rescue_usebackuproot: !! 913 args[0].from);
579 btrfs_set_opt(ctx->mou !! 914 ret = -EINVAL;
580 break; !! 915 goto out;
581 case Opt_rescue_nologreplay: !! 916 }
582 btrfs_set_opt(ctx->mou !! 917 break;
583 break; !! 918 case Opt_nodiscard:
584 case Opt_rescue_ignorebadroots !! 919 btrfs_clear_and_info(info, DISCARD_SYNC,
585 btrfs_set_opt(ctx->mou !! 920 "turning off discard");
586 break; !! 921 btrfs_clear_and_info(info, DISCARD_ASYNC,
587 case Opt_rescue_ignoredatacsum !! 922 "turning off async discard");
588 btrfs_set_opt(ctx->mou !! 923 break;
589 break; !! 924 case Opt_space_cache:
590 case Opt_rescue_ignoremetacsum !! 925 case Opt_space_cache_version:
591 btrfs_set_opt(ctx->mou !! 926 /*
592 break; !! 927 * We already set FREE_SPACE_TREE above because we have
593 case Opt_rescue_ignoresuperfla !! 928 * compat_ro(FREE_SPACE_TREE) set, and we aren't going
594 btrfs_set_opt(ctx->mou !! 929 * to allow v1 to be set for extent tree v2, simply
595 break; !! 930 * ignore this setting if we're extent tree v2.
596 case Opt_rescue_parameter_all: !! 931 */
597 btrfs_set_opt(ctx->mou !! 932 if (btrfs_fs_incompat(info, EXTENT_TREE_V2))
598 btrfs_set_opt(ctx->mou !! 933 break;
599 btrfs_set_opt(ctx->mou !! 934 if (token == Opt_space_cache ||
600 btrfs_set_opt(ctx->mou !! 935 strcmp(args[0].from, "v1") == 0) {
601 btrfs_set_opt(ctx->mou !! 936 btrfs_clear_opt(info->mount_opt,
>> 937 FREE_SPACE_TREE);
>> 938 btrfs_set_and_info(info, SPACE_CACHE,
>> 939 "enabling disk space caching");
>> 940 } else if (strcmp(args[0].from, "v2") == 0) {
>> 941 btrfs_clear_opt(info->mount_opt,
>> 942 SPACE_CACHE);
>> 943 btrfs_set_and_info(info, FREE_SPACE_TREE,
>> 944 "enabling free space tree");
>> 945 } else {
>> 946 btrfs_err(info, "unrecognized space_cache value %s",
>> 947 args[0].from);
>> 948 ret = -EINVAL;
>> 949 goto out;
>> 950 }
>> 951 break;
>> 952 case Opt_rescan_uuid_tree:
>> 953 btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
>> 954 break;
>> 955 case Opt_no_space_cache:
>> 956 /*
>> 957 * We cannot operate without the free space tree with
>> 958 * extent tree v2, ignore this option.
>> 959 */
>> 960 if (btrfs_fs_incompat(info, EXTENT_TREE_V2))
>> 961 break;
>> 962 if (btrfs_test_opt(info, SPACE_CACHE)) {
>> 963 btrfs_clear_and_info(info, SPACE_CACHE,
>> 964 "disabling disk space caching");
>> 965 }
>> 966 if (btrfs_test_opt(info, FREE_SPACE_TREE)) {
>> 967 btrfs_clear_and_info(info, FREE_SPACE_TREE,
>> 968 "disabling free space tree");
>> 969 }
>> 970 break;
>> 971 case Opt_inode_cache:
>> 972 case Opt_noinode_cache:
>> 973 btrfs_warn(info,
>> 974 "the 'inode_cache' option is deprecated and has no effect since 5.11");
>> 975 break;
>> 976 case Opt_clear_cache:
>> 977 /*
>> 978 * We cannot clear the free space tree with extent tree
>> 979 * v2, ignore this option.
>> 980 */
>> 981 if (btrfs_fs_incompat(info, EXTENT_TREE_V2))
>> 982 break;
>> 983 btrfs_set_and_info(info, CLEAR_CACHE,
>> 984 "force clearing of disk cache");
>> 985 break;
>> 986 case Opt_user_subvol_rm_allowed:
>> 987 btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
>> 988 break;
>> 989 case Opt_enospc_debug:
>> 990 btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
>> 991 break;
>> 992 case Opt_noenospc_debug:
>> 993 btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG);
>> 994 break;
>> 995 case Opt_defrag:
>> 996 btrfs_set_and_info(info, AUTO_DEFRAG,
>> 997 "enabling auto defrag");
>> 998 break;
>> 999 case Opt_nodefrag:
>> 1000 btrfs_clear_and_info(info, AUTO_DEFRAG,
>> 1001 "disabling auto defrag");
>> 1002 break;
>> 1003 case Opt_recovery:
>> 1004 case Opt_usebackuproot:
>> 1005 btrfs_warn(info,
>> 1006 "'%s' is deprecated, use 'rescue=usebackuproot' instead",
>> 1007 token == Opt_recovery ? "recovery" :
>> 1008 "usebackuproot");
>> 1009 btrfs_info(info,
>> 1010 "trying to use backup root at mount time");
>> 1011 btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
>> 1012 break;
>> 1013 case Opt_skip_balance:
>> 1014 btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
>> 1015 break;
>> 1016 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
>> 1017 case Opt_check_integrity_including_extent_data:
>> 1018 btrfs_info(info,
>> 1019 "enabling check integrity including extent data");
>> 1020 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY_DATA);
>> 1021 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
>> 1022 break;
>> 1023 case Opt_check_integrity:
>> 1024 btrfs_info(info, "enabling check integrity");
>> 1025 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
>> 1026 break;
>> 1027 case Opt_check_integrity_print_mask:
>> 1028 ret = match_int(&args[0], &intarg);
>> 1029 if (ret) {
>> 1030 btrfs_err(info,
>> 1031 "unrecognized check_integrity_print_mask value %s",
>> 1032 args[0].from);
>> 1033 goto out;
>> 1034 }
>> 1035 info->check_integrity_print_mask = intarg;
>> 1036 btrfs_info(info, "check_integrity_print_mask 0x%x",
>> 1037 info->check_integrity_print_mask);
>> 1038 break;
>> 1039 #else
>> 1040 case Opt_check_integrity_including_extent_data:
>> 1041 case Opt_check_integrity:
>> 1042 case Opt_check_integrity_print_mask:
>> 1043 btrfs_err(info,
>> 1044 "support for check_integrity* not compiled in!");
>> 1045 ret = -EINVAL;
>> 1046 goto out;
>> 1047 #endif
>> 1048 case Opt_fatal_errors:
>> 1049 if (strcmp(args[0].from, "panic") == 0) {
>> 1050 btrfs_set_opt(info->mount_opt,
>> 1051 PANIC_ON_FATAL_ERROR);
>> 1052 } else if (strcmp(args[0].from, "bug") == 0) {
>> 1053 btrfs_clear_opt(info->mount_opt,
>> 1054 PANIC_ON_FATAL_ERROR);
>> 1055 } else {
>> 1056 btrfs_err(info, "unrecognized fatal_errors value %s",
>> 1057 args[0].from);
>> 1058 ret = -EINVAL;
>> 1059 goto out;
>> 1060 }
>> 1061 break;
>> 1062 case Opt_commit_interval:
>> 1063 intarg = 0;
>> 1064 ret = match_int(&args[0], &intarg);
>> 1065 if (ret) {
>> 1066 btrfs_err(info, "unrecognized commit_interval value %s",
>> 1067 args[0].from);
>> 1068 ret = -EINVAL;
>> 1069 goto out;
>> 1070 }
>> 1071 if (intarg == 0) {
>> 1072 btrfs_info(info,
>> 1073 "using default commit interval %us",
>> 1074 BTRFS_DEFAULT_COMMIT_INTERVAL);
>> 1075 intarg = BTRFS_DEFAULT_COMMIT_INTERVAL;
>> 1076 } else if (intarg > 300) {
>> 1077 btrfs_warn(info, "excessive commit interval %d",
>> 1078 intarg);
>> 1079 }
>> 1080 info->commit_interval = intarg;
>> 1081 break;
>> 1082 case Opt_rescue:
>> 1083 ret = parse_rescue_options(info, args[0].from);
>> 1084 if (ret < 0) {
>> 1085 btrfs_err(info, "unrecognized rescue value %s",
>> 1086 args[0].from);
>> 1087 goto out;
>> 1088 }
602 break; 1089 break;
603 default: <<
604 btrfs_info(NULL, "unre <<
605 param->key) <<
606 return -EINVAL; <<
607 } <<
608 break; <<
609 #ifdef CONFIG_BTRFS_DEBUG 1090 #ifdef CONFIG_BTRFS_DEBUG
610 case Opt_fragment: !! 1091 case Opt_fragment_all:
611 switch (result.uint_32) { !! 1092 btrfs_info(info, "fragmenting all space");
612 case Opt_fragment_parameter_al !! 1093 btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
613 btrfs_set_opt(ctx->mou !! 1094 btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA);
614 btrfs_set_opt(ctx->mou <<
615 break; 1095 break;
616 case Opt_fragment_parameter_me !! 1096 case Opt_fragment_metadata:
617 btrfs_set_opt(ctx->mou !! 1097 btrfs_info(info, "fragmenting metadata");
>> 1098 btrfs_set_opt(info->mount_opt,
>> 1099 FRAGMENT_METADATA);
618 break; 1100 break;
619 case Opt_fragment_parameter_da !! 1101 case Opt_fragment_data:
620 btrfs_set_opt(ctx->mou !! 1102 btrfs_info(info, "fragmenting data");
>> 1103 btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
621 break; 1104 break;
622 default: <<
623 btrfs_info(NULL, "unre <<
624 param->key) <<
625 return -EINVAL; <<
626 } <<
627 break; <<
628 #endif 1105 #endif
629 #ifdef CONFIG_BTRFS_FS_REF_VERIFY 1106 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
630 case Opt_ref_verify: !! 1107 case Opt_ref_verify:
631 btrfs_set_opt(ctx->mount_opt, !! 1108 btrfs_info(info, "doing ref verification");
632 break; !! 1109 btrfs_set_opt(info->mount_opt, REF_VERIFY);
>> 1110 break;
633 #endif 1111 #endif
634 default: !! 1112 case Opt_err:
635 btrfs_err(NULL, "unrecognized !! 1113 btrfs_err(info, "unrecognized mount option '%s'", p);
636 return -EINVAL; !! 1114 ret = -EINVAL;
>> 1115 goto out;
>> 1116 default:
>> 1117 break;
>> 1118 }
637 } 1119 }
>> 1120 check:
>> 1121 /* We're read-only, don't have to check. */
>> 1122 if (new_flags & SB_RDONLY)
>> 1123 goto out;
638 1124
639 return 0; !! 1125 if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") ||
>> 1126 check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") ||
>> 1127 check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums"))
>> 1128 ret = -EINVAL;
>> 1129 out:
>> 1130 if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) &&
>> 1131 !btrfs_test_opt(info, FREE_SPACE_TREE) &&
>> 1132 !btrfs_test_opt(info, CLEAR_CACHE)) {
>> 1133 btrfs_err(info, "cannot disable free space tree");
>> 1134 ret = -EINVAL;
>> 1135
>> 1136 }
>> 1137 if (!ret)
>> 1138 ret = btrfs_check_mountopts_zoned(info);
>> 1139 if (!ret && btrfs_test_opt(info, SPACE_CACHE))
>> 1140 btrfs_info(info, "disk space caching is enabled");
>> 1141 if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE))
>> 1142 btrfs_info(info, "using free space tree");
>> 1143 return ret;
640 } 1144 }
641 1145
642 /* 1146 /*
643 * Some options only have meaning at mount tim !! 1147 * Parse mount options that are required early in the mount process.
644 * remounts, or be displayed. Clear these at t !! 1148 *
645 * paths. !! 1149 * All other options will be parsed on much later in the mount process and
>> 1150 * only when we need to allocate a new super block.
646 */ 1151 */
647 static void btrfs_clear_oneshot_options(struct !! 1152 static int btrfs_parse_device_options(const char *options, fmode_t flags,
>> 1153 void *holder)
648 { 1154 {
649 btrfs_clear_opt(fs_info->mount_opt, US !! 1155 substring_t args[MAX_OPT_ARGS];
650 btrfs_clear_opt(fs_info->mount_opt, CL !! 1156 char *device_name, *opts, *orig, *p;
651 btrfs_clear_opt(fs_info->mount_opt, NO !! 1157 struct btrfs_device *device = NULL;
652 } !! 1158 int error = 0;
653 1159
654 static bool check_ro_option(const struct btrfs !! 1160 lockdep_assert_held(&uuid_mutex);
655 unsigned long long <<
656 const char *opt_na <<
657 { <<
658 if (mount_opt & opt) { <<
659 btrfs_err(fs_info, "%s must be <<
660 opt_name); <<
661 return true; <<
662 } <<
663 return false; <<
664 } <<
665 1161
666 bool btrfs_check_options(const struct btrfs_fs !! 1162 if (!options)
667 unsigned long long *m !! 1163 return 0;
668 unsigned long flags) <<
669 { <<
670 bool ret = true; <<
671 <<
672 if (!(flags & SB_RDONLY) && <<
673 (check_ro_option(info, *mount_opt, <<
674 check_ro_option(info, *mount_opt, <<
675 check_ro_option(info, *mount_opt, <<
676 check_ro_option(info, *mount_opt, <<
677 check_ro_option(info, *mount_opt, <<
678 ret = false; <<
679 1164
680 if (btrfs_fs_compat_ro(info, FREE_SPAC !! 1165 /*
681 !btrfs_raw_test_opt(*mount_opt, FR !! 1166 * strsep changes the string, duplicate it because btrfs_parse_options
682 !btrfs_raw_test_opt(*mount_opt, CL !! 1167 * gets called later
683 btrfs_err(info, "cannot disabl !! 1168 */
684 ret = false; !! 1169 opts = kstrdup(options, GFP_KERNEL);
685 } !! 1170 if (!opts)
686 if (btrfs_fs_compat_ro(info, BLOCK_GRO !! 1171 return -ENOMEM;
687 !btrfs_raw_test_opt(*mount_opt, F !! 1172 orig = opts;
688 btrfs_err(info, "cannot disabl !! 1173
689 ret = false; !! 1174 while ((p = strsep(&opts, ",")) != NULL) {
690 } !! 1175 int token;
691 !! 1176
692 if (btrfs_check_mountopts_zoned(info, !! 1177 if (!*p)
693 ret = false; !! 1178 continue;
694 !! 1179
695 if (!test_bit(BTRFS_FS_STATE_REMOUNTIN !! 1180 token = match_token(p, tokens, args);
696 if (btrfs_raw_test_opt(*mount_ !! 1181 if (token == Opt_device) {
697 btrfs_info(info, "disk !! 1182 device_name = match_strdup(&args[0]);
698 btrfs_warn(info, !! 1183 if (!device_name) {
699 "space cache v1 is being deprecated and will b !! 1184 error = -ENOMEM;
>> 1185 goto out;
>> 1186 }
>> 1187 device = btrfs_scan_one_device(device_name, flags,
>> 1188 holder);
>> 1189 kfree(device_name);
>> 1190 if (IS_ERR(device)) {
>> 1191 error = PTR_ERR(device);
>> 1192 goto out;
>> 1193 }
700 } 1194 }
701 if (btrfs_raw_test_opt(*mount_ <<
702 btrfs_info(info, "usin <<
703 } 1195 }
704 1196
705 return ret; !! 1197 out:
>> 1198 kfree(orig);
>> 1199 return error;
706 } 1200 }
707 1201
708 /* 1202 /*
709 * This is subtle, we only call this during op !! 1203 * Parse mount options that are related to subvolume id
710 * the mount options with the on-disk settings <<
711 * effect we would do this on mount and remoun <<
712 * only do this on the initial mount. <<
713 * 1204 *
714 * This isn't a change in behavior, because we !! 1205 * The value is later passed to mount_subvol()
715 * file system to set the current mount option <<
716 * options to disable these features and then <<
717 * settings, because mounting without these fe <<
718 * settings, so this being called on re-mount <<
719 */ 1206 */
720 void btrfs_set_free_space_cache_settings(struc !! 1207 static int btrfs_parse_subvol_options(const char *options, char **subvol_name,
>> 1208 u64 *subvol_objectid)
721 { 1209 {
722 if (fs_info->sectorsize < PAGE_SIZE) { !! 1210 substring_t args[MAX_OPT_ARGS];
723 btrfs_clear_opt(fs_info->mount !! 1211 char *opts, *orig, *p;
724 if (!btrfs_test_opt(fs_info, F !! 1212 int error = 0;
725 btrfs_info(fs_info, !! 1213 u64 subvolid;
726 "forcing fr !! 1214
727 fs_info->se !! 1215 if (!options)
728 btrfs_set_opt(fs_info- !! 1216 return 0;
729 } <<
730 } <<
731 1217
732 /* 1218 /*
733 * At this point our mount options are !! 1219 * strsep changes the string, duplicate it because
734 * these settings if we don't have any !! 1220 * btrfs_parse_device_options gets called later
735 */ 1221 */
736 if (btrfs_test_opt(fs_info, FREE_SPACE !! 1222 opts = kstrdup(options, GFP_KERNEL);
737 return; !! 1223 if (!opts)
738 !! 1224 return -ENOMEM;
739 if (btrfs_is_zoned(fs_info) && !! 1225 orig = opts;
740 btrfs_free_space_cache_v1_active(f <<
741 btrfs_info(fs_info, "zoned: cl <<
742 btrfs_set_super_cache_generati <<
743 return; <<
744 } <<
745 1226
746 if (btrfs_test_opt(fs_info, SPACE_CACH !! 1227 while ((p = strsep(&opts, ",")) != NULL) {
747 return; !! 1228 int token;
>> 1229 if (!*p)
>> 1230 continue;
748 1231
749 if (btrfs_test_opt(fs_info, NOSPACECAC !! 1232 token = match_token(p, tokens, args);
750 return; !! 1233 switch (token) {
>> 1234 case Opt_subvol:
>> 1235 kfree(*subvol_name);
>> 1236 *subvol_name = match_strdup(&args[0]);
>> 1237 if (!*subvol_name) {
>> 1238 error = -ENOMEM;
>> 1239 goto out;
>> 1240 }
>> 1241 break;
>> 1242 case Opt_subvolid:
>> 1243 error = match_u64(&args[0], &subvolid);
>> 1244 if (error)
>> 1245 goto out;
751 1246
752 /* !! 1247 /* we want the original fs_tree */
753 * At this point we don't have explici !! 1248 if (subvolid == 0)
754 * them ourselves based on the state o !! 1249 subvolid = BTRFS_FS_TREE_OBJECTID;
755 */ <<
756 if (btrfs_fs_compat_ro(fs_info, FREE_S <<
757 btrfs_set_opt(fs_info->mount_o <<
758 else if (btrfs_free_space_cache_v1_act <<
759 btrfs_set_opt(fs_info->mount_o <<
760 } <<
761 1250
762 static void set_device_specific_options(struct !! 1251 *subvol_objectid = subvolid;
763 { !! 1252 break;
764 if (!btrfs_test_opt(fs_info, NOSSD) && !! 1253 default:
765 !fs_info->fs_devices->rotating) !! 1254 break;
766 btrfs_set_opt(fs_info->mount_o !! 1255 }
>> 1256 }
767 1257
768 /* !! 1258 out:
769 * For devices supporting discard turn !! 1259 kfree(orig);
770 * unless it's already set or disabled !! 1260 return error;
771 * nodiscard for the same mount. <<
772 * <<
773 * The zoned mode piggy backs on the d <<
774 * resetting a zone. There is no reaso <<
775 * fast enough. So, do not enable asyn <<
776 */ <<
777 if (!(btrfs_test_opt(fs_info, DISCARD_ <<
778 btrfs_test_opt(fs_info, DISCARD_ <<
779 btrfs_test_opt(fs_info, NODISCAR <<
780 fs_info->fs_devices->discardable & <<
781 !btrfs_is_zoned(fs_info)) <<
782 btrfs_set_opt(fs_info->mount_o <<
783 } 1261 }
784 1262
785 char *btrfs_get_subvol_name_from_objectid(stru 1263 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
786 u64 1264 u64 subvol_objectid)
787 { 1265 {
788 struct btrfs_root *root = fs_info->tre 1266 struct btrfs_root *root = fs_info->tree_root;
789 struct btrfs_root *fs_root = NULL; 1267 struct btrfs_root *fs_root = NULL;
790 struct btrfs_root_ref *root_ref; 1268 struct btrfs_root_ref *root_ref;
791 struct btrfs_inode_ref *inode_ref; 1269 struct btrfs_inode_ref *inode_ref;
792 struct btrfs_key key; 1270 struct btrfs_key key;
793 struct btrfs_path *path = NULL; 1271 struct btrfs_path *path = NULL;
794 char *name = NULL, *ptr; 1272 char *name = NULL, *ptr;
795 u64 dirid; 1273 u64 dirid;
796 int len; 1274 int len;
797 int ret; 1275 int ret;
798 1276
799 path = btrfs_alloc_path(); 1277 path = btrfs_alloc_path();
800 if (!path) { 1278 if (!path) {
801 ret = -ENOMEM; 1279 ret = -ENOMEM;
802 goto err; 1280 goto err;
803 } 1281 }
804 1282
805 name = kmalloc(PATH_MAX, GFP_KERNEL); 1283 name = kmalloc(PATH_MAX, GFP_KERNEL);
806 if (!name) { 1284 if (!name) {
807 ret = -ENOMEM; 1285 ret = -ENOMEM;
808 goto err; 1286 goto err;
809 } 1287 }
810 ptr = name + PATH_MAX - 1; 1288 ptr = name + PATH_MAX - 1;
811 ptr[0] = '\0'; 1289 ptr[0] = '\0';
812 1290
813 /* 1291 /*
814 * Walk up the subvolume trees in the 1292 * Walk up the subvolume trees in the tree of tree roots by root
815 * backrefs until we hit the top-level 1293 * backrefs until we hit the top-level subvolume.
816 */ 1294 */
817 while (subvol_objectid != BTRFS_FS_TRE 1295 while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
818 key.objectid = subvol_objectid 1296 key.objectid = subvol_objectid;
819 key.type = BTRFS_ROOT_BACKREF_ 1297 key.type = BTRFS_ROOT_BACKREF_KEY;
820 key.offset = (u64)-1; 1298 key.offset = (u64)-1;
821 1299
822 ret = btrfs_search_backwards(r 1300 ret = btrfs_search_backwards(root, &key, path);
823 if (ret < 0) { 1301 if (ret < 0) {
824 goto err; 1302 goto err;
825 } else if (ret > 0) { 1303 } else if (ret > 0) {
826 ret = -ENOENT; 1304 ret = -ENOENT;
827 goto err; 1305 goto err;
828 } 1306 }
829 1307
830 subvol_objectid = key.offset; 1308 subvol_objectid = key.offset;
831 1309
832 root_ref = btrfs_item_ptr(path 1310 root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
833 stru 1311 struct btrfs_root_ref);
834 len = btrfs_root_ref_name_len( 1312 len = btrfs_root_ref_name_len(path->nodes[0], root_ref);
835 ptr -= len + 1; 1313 ptr -= len + 1;
836 if (ptr < name) { 1314 if (ptr < name) {
837 ret = -ENAMETOOLONG; 1315 ret = -ENAMETOOLONG;
838 goto err; 1316 goto err;
839 } 1317 }
840 read_extent_buffer(path->nodes 1318 read_extent_buffer(path->nodes[0], ptr + 1,
841 (unsigned l 1319 (unsigned long)(root_ref + 1), len);
842 ptr[0] = '/'; 1320 ptr[0] = '/';
843 dirid = btrfs_root_ref_dirid(p 1321 dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref);
844 btrfs_release_path(path); 1322 btrfs_release_path(path);
845 1323
846 fs_root = btrfs_get_fs_root(fs 1324 fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true);
847 if (IS_ERR(fs_root)) { 1325 if (IS_ERR(fs_root)) {
848 ret = PTR_ERR(fs_root) 1326 ret = PTR_ERR(fs_root);
849 fs_root = NULL; 1327 fs_root = NULL;
850 goto err; 1328 goto err;
851 } 1329 }
852 1330
853 /* 1331 /*
854 * Walk up the filesystem tree 1332 * Walk up the filesystem tree by inode refs until we hit the
855 * root directory. 1333 * root directory.
856 */ 1334 */
857 while (dirid != BTRFS_FIRST_FR 1335 while (dirid != BTRFS_FIRST_FREE_OBJECTID) {
858 key.objectid = dirid; 1336 key.objectid = dirid;
859 key.type = BTRFS_INODE 1337 key.type = BTRFS_INODE_REF_KEY;
860 key.offset = (u64)-1; 1338 key.offset = (u64)-1;
861 1339
862 ret = btrfs_search_bac 1340 ret = btrfs_search_backwards(fs_root, &key, path);
863 if (ret < 0) { 1341 if (ret < 0) {
864 goto err; 1342 goto err;
865 } else if (ret > 0) { 1343 } else if (ret > 0) {
866 ret = -ENOENT; 1344 ret = -ENOENT;
867 goto err; 1345 goto err;
868 } 1346 }
869 1347
870 dirid = key.offset; 1348 dirid = key.offset;
871 1349
872 inode_ref = btrfs_item 1350 inode_ref = btrfs_item_ptr(path->nodes[0],
873 1351 path->slots[0],
874 1352 struct btrfs_inode_ref);
875 len = btrfs_inode_ref_ 1353 len = btrfs_inode_ref_name_len(path->nodes[0],
876 1354 inode_ref);
877 ptr -= len + 1; 1355 ptr -= len + 1;
878 if (ptr < name) { 1356 if (ptr < name) {
879 ret = -ENAMETO 1357 ret = -ENAMETOOLONG;
880 goto err; 1358 goto err;
881 } 1359 }
882 read_extent_buffer(pat 1360 read_extent_buffer(path->nodes[0], ptr + 1,
883 (un 1361 (unsigned long)(inode_ref + 1), len);
884 ptr[0] = '/'; 1362 ptr[0] = '/';
885 btrfs_release_path(pat 1363 btrfs_release_path(path);
886 } 1364 }
887 btrfs_put_root(fs_root); 1365 btrfs_put_root(fs_root);
888 fs_root = NULL; 1366 fs_root = NULL;
889 } 1367 }
890 1368
891 btrfs_free_path(path); 1369 btrfs_free_path(path);
892 if (ptr == name + PATH_MAX - 1) { 1370 if (ptr == name + PATH_MAX - 1) {
893 name[0] = '/'; 1371 name[0] = '/';
894 name[1] = '\0'; 1372 name[1] = '\0';
895 } else { 1373 } else {
896 memmove(name, ptr, name + PATH 1374 memmove(name, ptr, name + PATH_MAX - ptr);
897 } 1375 }
898 return name; 1376 return name;
899 1377
900 err: 1378 err:
901 btrfs_put_root(fs_root); 1379 btrfs_put_root(fs_root);
902 btrfs_free_path(path); 1380 btrfs_free_path(path);
903 kfree(name); 1381 kfree(name);
904 return ERR_PTR(ret); 1382 return ERR_PTR(ret);
905 } 1383 }
906 1384
907 static int get_default_subvol_objectid(struct 1385 static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid)
908 { 1386 {
909 struct btrfs_root *root = fs_info->tre 1387 struct btrfs_root *root = fs_info->tree_root;
910 struct btrfs_dir_item *di; 1388 struct btrfs_dir_item *di;
911 struct btrfs_path *path; 1389 struct btrfs_path *path;
912 struct btrfs_key location; 1390 struct btrfs_key location;
913 struct fscrypt_str name = FSTR_INIT("d <<
914 u64 dir_id; 1391 u64 dir_id;
915 1392
916 path = btrfs_alloc_path(); 1393 path = btrfs_alloc_path();
917 if (!path) 1394 if (!path)
918 return -ENOMEM; 1395 return -ENOMEM;
919 1396
920 /* 1397 /*
921 * Find the "default" dir item which p 1398 * Find the "default" dir item which points to the root item that we
922 * will mount by default if we haven't 1399 * will mount by default if we haven't been given a specific subvolume
923 * to mount. 1400 * to mount.
924 */ 1401 */
925 dir_id = btrfs_super_root_dir(fs_info- 1402 dir_id = btrfs_super_root_dir(fs_info->super_copy);
926 di = btrfs_lookup_dir_item(NULL, root, !! 1403 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
927 if (IS_ERR(di)) { 1404 if (IS_ERR(di)) {
928 btrfs_free_path(path); 1405 btrfs_free_path(path);
929 return PTR_ERR(di); 1406 return PTR_ERR(di);
930 } 1407 }
931 if (!di) { 1408 if (!di) {
932 /* 1409 /*
933 * Ok the default dir item isn 1410 * Ok the default dir item isn't there. This is weird since
934 * it's always been there, but 1411 * it's always been there, but don't freak out, just try and
935 * mount the top-level subvolu 1412 * mount the top-level subvolume.
936 */ 1413 */
937 btrfs_free_path(path); 1414 btrfs_free_path(path);
938 *objectid = BTRFS_FS_TREE_OBJE 1415 *objectid = BTRFS_FS_TREE_OBJECTID;
939 return 0; 1416 return 0;
940 } 1417 }
941 1418
942 btrfs_dir_item_key_to_cpu(path->nodes[ 1419 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
943 btrfs_free_path(path); 1420 btrfs_free_path(path);
944 *objectid = location.objectid; 1421 *objectid = location.objectid;
945 return 0; 1422 return 0;
946 } 1423 }
947 1424
948 static int btrfs_fill_super(struct super_block 1425 static int btrfs_fill_super(struct super_block *sb,
949 struct btrfs_fs_de 1426 struct btrfs_fs_devices *fs_devices,
950 void *data) 1427 void *data)
951 { 1428 {
952 struct inode *inode; 1429 struct inode *inode;
953 struct btrfs_fs_info *fs_info = btrfs_ 1430 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
954 int err; 1431 int err;
955 1432
956 sb->s_maxbytes = MAX_LFS_FILESIZE; 1433 sb->s_maxbytes = MAX_LFS_FILESIZE;
957 sb->s_magic = BTRFS_SUPER_MAGIC; 1434 sb->s_magic = BTRFS_SUPER_MAGIC;
958 sb->s_op = &btrfs_super_ops; 1435 sb->s_op = &btrfs_super_ops;
959 sb->s_d_op = &btrfs_dentry_operations; 1436 sb->s_d_op = &btrfs_dentry_operations;
960 sb->s_export_op = &btrfs_export_ops; 1437 sb->s_export_op = &btrfs_export_ops;
961 #ifdef CONFIG_FS_VERITY 1438 #ifdef CONFIG_FS_VERITY
962 sb->s_vop = &btrfs_verityops; 1439 sb->s_vop = &btrfs_verityops;
963 #endif 1440 #endif
964 sb->s_xattr = btrfs_xattr_handlers; 1441 sb->s_xattr = btrfs_xattr_handlers;
965 sb->s_time_gran = 1; 1442 sb->s_time_gran = 1;
>> 1443 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
>> 1444 sb->s_flags |= SB_POSIXACL;
>> 1445 #endif
>> 1446 sb->s_flags |= SB_I_VERSION;
966 sb->s_iflags |= SB_I_CGROUPWB; 1447 sb->s_iflags |= SB_I_CGROUPWB;
967 1448
968 err = super_setup_bdi(sb); 1449 err = super_setup_bdi(sb);
969 if (err) { 1450 if (err) {
970 btrfs_err(fs_info, "super_setu 1451 btrfs_err(fs_info, "super_setup_bdi failed");
971 return err; 1452 return err;
972 } 1453 }
973 1454
974 err = open_ctree(sb, fs_devices, (char 1455 err = open_ctree(sb, fs_devices, (char *)data);
975 if (err) { 1456 if (err) {
976 btrfs_err(fs_info, "open_ctree 1457 btrfs_err(fs_info, "open_ctree failed");
977 return err; 1458 return err;
978 } 1459 }
979 1460
980 inode = btrfs_iget(BTRFS_FIRST_FREE_OB !! 1461 inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root);
981 if (IS_ERR(inode)) { 1462 if (IS_ERR(inode)) {
982 err = PTR_ERR(inode); 1463 err = PTR_ERR(inode);
983 btrfs_handle_fs_error(fs_info, <<
984 goto fail_close; 1464 goto fail_close;
985 } 1465 }
986 1466
987 sb->s_root = d_make_root(inode); 1467 sb->s_root = d_make_root(inode);
988 if (!sb->s_root) { 1468 if (!sb->s_root) {
989 err = -ENOMEM; 1469 err = -ENOMEM;
990 goto fail_close; 1470 goto fail_close;
991 } 1471 }
992 1472
993 sb->s_flags |= SB_ACTIVE; 1473 sb->s_flags |= SB_ACTIVE;
994 return 0; 1474 return 0;
995 1475
996 fail_close: 1476 fail_close:
997 close_ctree(fs_info); 1477 close_ctree(fs_info);
998 return err; 1478 return err;
999 } 1479 }
1000 1480
1001 int btrfs_sync_fs(struct super_block *sb, int 1481 int btrfs_sync_fs(struct super_block *sb, int wait)
1002 { 1482 {
1003 struct btrfs_trans_handle *trans; 1483 struct btrfs_trans_handle *trans;
1004 struct btrfs_fs_info *fs_info = btrfs 1484 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1005 struct btrfs_root *root = fs_info->tr 1485 struct btrfs_root *root = fs_info->tree_root;
1006 1486
1007 trace_btrfs_sync_fs(fs_info, wait); 1487 trace_btrfs_sync_fs(fs_info, wait);
1008 1488
1009 if (!wait) { 1489 if (!wait) {
1010 filemap_flush(fs_info->btree_ 1490 filemap_flush(fs_info->btree_inode->i_mapping);
1011 return 0; 1491 return 0;
1012 } 1492 }
1013 1493
1014 btrfs_wait_ordered_roots(fs_info, U64 !! 1494 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
1015 1495
1016 trans = btrfs_attach_transaction_barr 1496 trans = btrfs_attach_transaction_barrier(root);
1017 if (IS_ERR(trans)) { 1497 if (IS_ERR(trans)) {
1018 /* no transaction, don't both 1498 /* no transaction, don't bother */
1019 if (PTR_ERR(trans) == -ENOENT 1499 if (PTR_ERR(trans) == -ENOENT) {
1020 /* 1500 /*
1021 * Exit unless we hav 1501 * Exit unless we have some pending changes
1022 * that need to go th 1502 * that need to go through commit
1023 */ 1503 */
1024 if (!test_bit(BTRFS_F !! 1504 if (fs_info->pending_changes == 0)
1025 &fs_inf <<
1026 return 0; 1505 return 0;
1027 /* 1506 /*
1028 * A non-blocking tes 1507 * A non-blocking test if the fs is frozen. We must not
1029 * start a new transa 1508 * start a new transaction here otherwise a deadlock
1030 * happens. The pendi 1509 * happens. The pending operations are delayed to the
1031 * next commit after 1510 * next commit after thawing.
1032 */ 1511 */
1033 if (sb_start_write_tr 1512 if (sb_start_write_trylock(sb))
1034 sb_end_write( 1513 sb_end_write(sb);
1035 else 1514 else
1036 return 0; 1515 return 0;
1037 trans = btrfs_start_t 1516 trans = btrfs_start_transaction(root, 0);
1038 } 1517 }
1039 if (IS_ERR(trans)) 1518 if (IS_ERR(trans))
1040 return PTR_ERR(trans) 1519 return PTR_ERR(trans);
1041 } 1520 }
1042 return btrfs_commit_transaction(trans 1521 return btrfs_commit_transaction(trans);
1043 } 1522 }
1044 1523
1045 static void print_rescue_option(struct seq_fi 1524 static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed)
1046 { 1525 {
1047 seq_printf(seq, "%s%s", (*printed) ? 1526 seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s);
1048 *printed = true; 1527 *printed = true;
1049 } 1528 }
1050 1529
1051 static int btrfs_show_options(struct seq_file 1530 static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
1052 { 1531 {
1053 struct btrfs_fs_info *info = btrfs_sb 1532 struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
1054 const char *compress_type; 1533 const char *compress_type;
1055 const char *subvol_name; 1534 const char *subvol_name;
1056 bool printed = false; 1535 bool printed = false;
1057 1536
1058 if (btrfs_test_opt(info, DEGRADED)) 1537 if (btrfs_test_opt(info, DEGRADED))
1059 seq_puts(seq, ",degraded"); 1538 seq_puts(seq, ",degraded");
1060 if (btrfs_test_opt(info, NODATASUM)) 1539 if (btrfs_test_opt(info, NODATASUM))
1061 seq_puts(seq, ",nodatasum"); 1540 seq_puts(seq, ",nodatasum");
1062 if (btrfs_test_opt(info, NODATACOW)) 1541 if (btrfs_test_opt(info, NODATACOW))
1063 seq_puts(seq, ",nodatacow"); 1542 seq_puts(seq, ",nodatacow");
1064 if (btrfs_test_opt(info, NOBARRIER)) 1543 if (btrfs_test_opt(info, NOBARRIER))
1065 seq_puts(seq, ",nobarrier"); 1544 seq_puts(seq, ",nobarrier");
1066 if (info->max_inline != BTRFS_DEFAULT 1545 if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE)
1067 seq_printf(seq, ",max_inline= 1546 seq_printf(seq, ",max_inline=%llu", info->max_inline);
1068 if (info->thread_pool_size != min_t( 1547 if (info->thread_pool_size != min_t(unsigned long,
1069 1548 num_online_cpus() + 2, 8))
1070 seq_printf(seq, ",thread_pool 1549 seq_printf(seq, ",thread_pool=%u", info->thread_pool_size);
1071 if (btrfs_test_opt(info, COMPRESS)) { 1550 if (btrfs_test_opt(info, COMPRESS)) {
1072 compress_type = btrfs_compres 1551 compress_type = btrfs_compress_type2str(info->compress_type);
1073 if (btrfs_test_opt(info, FORC 1552 if (btrfs_test_opt(info, FORCE_COMPRESS))
1074 seq_printf(seq, ",com 1553 seq_printf(seq, ",compress-force=%s", compress_type);
1075 else 1554 else
1076 seq_printf(seq, ",com 1555 seq_printf(seq, ",compress=%s", compress_type);
1077 if (info->compress_level) 1556 if (info->compress_level)
1078 seq_printf(seq, ":%d" 1557 seq_printf(seq, ":%d", info->compress_level);
1079 } 1558 }
1080 if (btrfs_test_opt(info, NOSSD)) 1559 if (btrfs_test_opt(info, NOSSD))
1081 seq_puts(seq, ",nossd"); 1560 seq_puts(seq, ",nossd");
1082 if (btrfs_test_opt(info, SSD_SPREAD)) 1561 if (btrfs_test_opt(info, SSD_SPREAD))
1083 seq_puts(seq, ",ssd_spread"); 1562 seq_puts(seq, ",ssd_spread");
1084 else if (btrfs_test_opt(info, SSD)) 1563 else if (btrfs_test_opt(info, SSD))
1085 seq_puts(seq, ",ssd"); 1564 seq_puts(seq, ",ssd");
1086 if (btrfs_test_opt(info, NOTREELOG)) 1565 if (btrfs_test_opt(info, NOTREELOG))
1087 seq_puts(seq, ",notreelog"); 1566 seq_puts(seq, ",notreelog");
1088 if (btrfs_test_opt(info, NOLOGREPLAY) 1567 if (btrfs_test_opt(info, NOLOGREPLAY))
1089 print_rescue_option(seq, "nol 1568 print_rescue_option(seq, "nologreplay", &printed);
1090 if (btrfs_test_opt(info, USEBACKUPROO 1569 if (btrfs_test_opt(info, USEBACKUPROOT))
1091 print_rescue_option(seq, "use 1570 print_rescue_option(seq, "usebackuproot", &printed);
1092 if (btrfs_test_opt(info, IGNOREBADROO 1571 if (btrfs_test_opt(info, IGNOREBADROOTS))
1093 print_rescue_option(seq, "ign 1572 print_rescue_option(seq, "ignorebadroots", &printed);
1094 if (btrfs_test_opt(info, IGNOREDATACS 1573 if (btrfs_test_opt(info, IGNOREDATACSUMS))
1095 print_rescue_option(seq, "ign 1574 print_rescue_option(seq, "ignoredatacsums", &printed);
1096 if (btrfs_test_opt(info, IGNOREMETACS <<
1097 print_rescue_option(seq, "ign <<
1098 if (btrfs_test_opt(info, IGNORESUPERF <<
1099 print_rescue_option(seq, "ign <<
1100 if (btrfs_test_opt(info, FLUSHONCOMMI 1575 if (btrfs_test_opt(info, FLUSHONCOMMIT))
1101 seq_puts(seq, ",flushoncommit 1576 seq_puts(seq, ",flushoncommit");
1102 if (btrfs_test_opt(info, DISCARD_SYNC 1577 if (btrfs_test_opt(info, DISCARD_SYNC))
1103 seq_puts(seq, ",discard"); 1578 seq_puts(seq, ",discard");
1104 if (btrfs_test_opt(info, DISCARD_ASYN 1579 if (btrfs_test_opt(info, DISCARD_ASYNC))
1105 seq_puts(seq, ",discard=async 1580 seq_puts(seq, ",discard=async");
1106 if (!(info->sb->s_flags & SB_POSIXACL 1581 if (!(info->sb->s_flags & SB_POSIXACL))
1107 seq_puts(seq, ",noacl"); 1582 seq_puts(seq, ",noacl");
1108 if (btrfs_free_space_cache_v1_active( 1583 if (btrfs_free_space_cache_v1_active(info))
1109 seq_puts(seq, ",space_cache") 1584 seq_puts(seq, ",space_cache");
1110 else if (btrfs_fs_compat_ro(info, FRE 1585 else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
1111 seq_puts(seq, ",space_cache=v 1586 seq_puts(seq, ",space_cache=v2");
1112 else 1587 else
1113 seq_puts(seq, ",nospace_cache 1588 seq_puts(seq, ",nospace_cache");
1114 if (btrfs_test_opt(info, RESCAN_UUID_ 1589 if (btrfs_test_opt(info, RESCAN_UUID_TREE))
1115 seq_puts(seq, ",rescan_uuid_t 1590 seq_puts(seq, ",rescan_uuid_tree");
1116 if (btrfs_test_opt(info, CLEAR_CACHE) 1591 if (btrfs_test_opt(info, CLEAR_CACHE))
1117 seq_puts(seq, ",clear_cache") 1592 seq_puts(seq, ",clear_cache");
1118 if (btrfs_test_opt(info, USER_SUBVOL_ 1593 if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED))
1119 seq_puts(seq, ",user_subvol_r 1594 seq_puts(seq, ",user_subvol_rm_allowed");
1120 if (btrfs_test_opt(info, ENOSPC_DEBUG 1595 if (btrfs_test_opt(info, ENOSPC_DEBUG))
1121 seq_puts(seq, ",enospc_debug" 1596 seq_puts(seq, ",enospc_debug");
1122 if (btrfs_test_opt(info, AUTO_DEFRAG) 1597 if (btrfs_test_opt(info, AUTO_DEFRAG))
1123 seq_puts(seq, ",autodefrag"); 1598 seq_puts(seq, ",autodefrag");
1124 if (btrfs_test_opt(info, SKIP_BALANCE 1599 if (btrfs_test_opt(info, SKIP_BALANCE))
1125 seq_puts(seq, ",skip_balance" 1600 seq_puts(seq, ",skip_balance");
>> 1601 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
>> 1602 if (btrfs_test_opt(info, CHECK_INTEGRITY_DATA))
>> 1603 seq_puts(seq, ",check_int_data");
>> 1604 else if (btrfs_test_opt(info, CHECK_INTEGRITY))
>> 1605 seq_puts(seq, ",check_int");
>> 1606 if (info->check_integrity_print_mask)
>> 1607 seq_printf(seq, ",check_int_print_mask=%d",
>> 1608 info->check_integrity_print_mask);
>> 1609 #endif
1126 if (info->metadata_ratio) 1610 if (info->metadata_ratio)
1127 seq_printf(seq, ",metadata_ra 1611 seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio);
1128 if (btrfs_test_opt(info, PANIC_ON_FAT 1612 if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR))
1129 seq_puts(seq, ",fatal_errors= 1613 seq_puts(seq, ",fatal_errors=panic");
1130 if (info->commit_interval != BTRFS_DE 1614 if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
1131 seq_printf(seq, ",commit=%u", 1615 seq_printf(seq, ",commit=%u", info->commit_interval);
1132 #ifdef CONFIG_BTRFS_DEBUG 1616 #ifdef CONFIG_BTRFS_DEBUG
1133 if (btrfs_test_opt(info, FRAGMENT_DAT 1617 if (btrfs_test_opt(info, FRAGMENT_DATA))
1134 seq_puts(seq, ",fragment=data 1618 seq_puts(seq, ",fragment=data");
1135 if (btrfs_test_opt(info, FRAGMENT_MET 1619 if (btrfs_test_opt(info, FRAGMENT_METADATA))
1136 seq_puts(seq, ",fragment=meta 1620 seq_puts(seq, ",fragment=metadata");
1137 #endif 1621 #endif
1138 if (btrfs_test_opt(info, REF_VERIFY)) 1622 if (btrfs_test_opt(info, REF_VERIFY))
1139 seq_puts(seq, ",ref_verify"); 1623 seq_puts(seq, ",ref_verify");
1140 seq_printf(seq, ",subvolid=%llu", btr !! 1624 seq_printf(seq, ",subvolid=%llu",
>> 1625 BTRFS_I(d_inode(dentry))->root->root_key.objectid);
1141 subvol_name = btrfs_get_subvol_name_f 1626 subvol_name = btrfs_get_subvol_name_from_objectid(info,
1142 btrfs_root_id(BTRFS_I !! 1627 BTRFS_I(d_inode(dentry))->root->root_key.objectid);
1143 if (!IS_ERR(subvol_name)) { 1628 if (!IS_ERR(subvol_name)) {
1144 seq_puts(seq, ",subvol="); 1629 seq_puts(seq, ",subvol=");
1145 seq_escape(seq, subvol_name, 1630 seq_escape(seq, subvol_name, " \t\n\\");
1146 kfree(subvol_name); 1631 kfree(subvol_name);
1147 } 1632 }
1148 return 0; 1633 return 0;
1149 } 1634 }
1150 1635
>> 1636 static int btrfs_test_super(struct super_block *s, void *data)
>> 1637 {
>> 1638 struct btrfs_fs_info *p = data;
>> 1639 struct btrfs_fs_info *fs_info = btrfs_sb(s);
>> 1640
>> 1641 return fs_info->fs_devices == p->fs_devices;
>> 1642 }
>> 1643
>> 1644 static int btrfs_set_super(struct super_block *s, void *data)
>> 1645 {
>> 1646 int err = set_anon_super(s, data);
>> 1647 if (!err)
>> 1648 s->s_fs_info = data;
>> 1649 return err;
>> 1650 }
>> 1651
1151 /* 1652 /*
1152 * subvolumes are identified by ino 256 1653 * subvolumes are identified by ino 256
1153 */ 1654 */
1154 static inline int is_subvolume_inode(struct i 1655 static inline int is_subvolume_inode(struct inode *inode)
1155 { 1656 {
1156 if (inode && inode->i_ino == BTRFS_FI 1657 if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
1157 return 1; 1658 return 1;
1158 return 0; 1659 return 0;
1159 } 1660 }
1160 1661
1161 static struct dentry *mount_subvol(const char 1662 static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
1162 struct vfs 1663 struct vfsmount *mnt)
1163 { 1664 {
1164 struct dentry *root; 1665 struct dentry *root;
1165 int ret; 1666 int ret;
1166 1667
1167 if (!subvol_name) { 1668 if (!subvol_name) {
1168 if (!subvol_objectid) { 1669 if (!subvol_objectid) {
1169 ret = get_default_sub 1670 ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb),
1170 1671 &subvol_objectid);
1171 if (ret) { 1672 if (ret) {
1172 root = ERR_PT 1673 root = ERR_PTR(ret);
1173 goto out; 1674 goto out;
1174 } 1675 }
1175 } 1676 }
1176 subvol_name = btrfs_get_subvo 1677 subvol_name = btrfs_get_subvol_name_from_objectid(
1177 btrfs 1678 btrfs_sb(mnt->mnt_sb), subvol_objectid);
1178 if (IS_ERR(subvol_name)) { 1679 if (IS_ERR(subvol_name)) {
1179 root = ERR_CAST(subvo 1680 root = ERR_CAST(subvol_name);
1180 subvol_name = NULL; 1681 subvol_name = NULL;
1181 goto out; 1682 goto out;
1182 } 1683 }
1183 1684
1184 } 1685 }
1185 1686
1186 root = mount_subtree(mnt, subvol_name 1687 root = mount_subtree(mnt, subvol_name);
1187 /* mount_subtree() drops our referenc 1688 /* mount_subtree() drops our reference on the vfsmount. */
1188 mnt = NULL; 1689 mnt = NULL;
1189 1690
1190 if (!IS_ERR(root)) { 1691 if (!IS_ERR(root)) {
1191 struct super_block *s = root- 1692 struct super_block *s = root->d_sb;
1192 struct btrfs_fs_info *fs_info 1693 struct btrfs_fs_info *fs_info = btrfs_sb(s);
1193 struct inode *root_inode = d_ 1694 struct inode *root_inode = d_inode(root);
1194 u64 root_objectid = btrfs_roo !! 1695 u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid;
1195 1696
1196 ret = 0; 1697 ret = 0;
1197 if (!is_subvolume_inode(root_ 1698 if (!is_subvolume_inode(root_inode)) {
1198 btrfs_err(fs_info, "' 1699 btrfs_err(fs_info, "'%s' is not a valid subvolume",
1199 subvol_name); 1700 subvol_name);
1200 ret = -EINVAL; 1701 ret = -EINVAL;
1201 } 1702 }
1202 if (subvol_objectid && root_o 1703 if (subvol_objectid && root_objectid != subvol_objectid) {
1203 /* 1704 /*
1204 * This will also cat 1705 * This will also catch a race condition where a
1205 * subvolume which wa 1706 * subvolume which was passed by ID is renamed and
1206 * another subvolume 1707 * another subvolume is renamed over the old location.
1207 */ 1708 */
1208 btrfs_err(fs_info, 1709 btrfs_err(fs_info,
1209 "subvol '%s 1710 "subvol '%s' does not match subvolid %llu",
1210 subvol_name 1711 subvol_name, subvol_objectid);
1211 ret = -EINVAL; 1712 ret = -EINVAL;
1212 } 1713 }
1213 if (ret) { 1714 if (ret) {
1214 dput(root); 1715 dput(root);
1215 root = ERR_PTR(ret); 1716 root = ERR_PTR(ret);
1216 deactivate_locked_sup 1717 deactivate_locked_super(s);
1217 } 1718 }
1218 } 1719 }
1219 1720
1220 out: 1721 out:
1221 mntput(mnt); 1722 mntput(mnt);
1222 kfree(subvol_name); 1723 kfree(subvol_name);
1223 return root; 1724 return root;
1224 } 1725 }
1225 1726
>> 1727 /*
>> 1728 * Find a superblock for the given device / mount point.
>> 1729 *
>> 1730 * Note: This is based on mount_bdev from fs/super.c with a few additions
>> 1731 * for multiple device setup. Make sure to keep it in sync.
>> 1732 */
>> 1733 static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
>> 1734 int flags, const char *device_name, void *data)
>> 1735 {
>> 1736 struct block_device *bdev = NULL;
>> 1737 struct super_block *s;
>> 1738 struct btrfs_device *device = NULL;
>> 1739 struct btrfs_fs_devices *fs_devices = NULL;
>> 1740 struct btrfs_fs_info *fs_info = NULL;
>> 1741 void *new_sec_opts = NULL;
>> 1742 fmode_t mode = FMODE_READ;
>> 1743 int error = 0;
>> 1744
>> 1745 if (!(flags & SB_RDONLY))
>> 1746 mode |= FMODE_WRITE;
>> 1747
>> 1748 if (data) {
>> 1749 error = security_sb_eat_lsm_opts(data, &new_sec_opts);
>> 1750 if (error)
>> 1751 return ERR_PTR(error);
>> 1752 }
>> 1753
>> 1754 /*
>> 1755 * Setup a dummy root and fs_info for test/set super. This is because
>> 1756 * we don't actually fill this stuff out until open_ctree, but we need
>> 1757 * then open_ctree will properly initialize the file system specific
>> 1758 * settings later. btrfs_init_fs_info initializes the static elements
>> 1759 * of the fs_info (locks and such) to make cleanup easier if we find a
>> 1760 * superblock with our given fs_devices later on at sget() time.
>> 1761 */
>> 1762 fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL);
>> 1763 if (!fs_info) {
>> 1764 error = -ENOMEM;
>> 1765 goto error_sec_opts;
>> 1766 }
>> 1767 btrfs_init_fs_info(fs_info);
>> 1768
>> 1769 fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
>> 1770 fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL);
>> 1771 if (!fs_info->super_copy || !fs_info->super_for_commit) {
>> 1772 error = -ENOMEM;
>> 1773 goto error_fs_info;
>> 1774 }
>> 1775
>> 1776 mutex_lock(&uuid_mutex);
>> 1777 error = btrfs_parse_device_options(data, mode, fs_type);
>> 1778 if (error) {
>> 1779 mutex_unlock(&uuid_mutex);
>> 1780 goto error_fs_info;
>> 1781 }
>> 1782
>> 1783 device = btrfs_scan_one_device(device_name, mode, fs_type);
>> 1784 if (IS_ERR(device)) {
>> 1785 mutex_unlock(&uuid_mutex);
>> 1786 error = PTR_ERR(device);
>> 1787 goto error_fs_info;
>> 1788 }
>> 1789
>> 1790 fs_devices = device->fs_devices;
>> 1791 fs_info->fs_devices = fs_devices;
>> 1792
>> 1793 error = btrfs_open_devices(fs_devices, mode, fs_type);
>> 1794 mutex_unlock(&uuid_mutex);
>> 1795 if (error)
>> 1796 goto error_fs_info;
>> 1797
>> 1798 if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) {
>> 1799 error = -EACCES;
>> 1800 goto error_close_devices;
>> 1801 }
>> 1802
>> 1803 bdev = fs_devices->latest_dev->bdev;
>> 1804 s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC,
>> 1805 fs_info);
>> 1806 if (IS_ERR(s)) {
>> 1807 error = PTR_ERR(s);
>> 1808 goto error_close_devices;
>> 1809 }
>> 1810
>> 1811 if (s->s_root) {
>> 1812 btrfs_close_devices(fs_devices);
>> 1813 btrfs_free_fs_info(fs_info);
>> 1814 if ((flags ^ s->s_flags) & SB_RDONLY)
>> 1815 error = -EBUSY;
>> 1816 } else {
>> 1817 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
>> 1818 btrfs_sb(s)->bdev_holder = fs_type;
>> 1819 if (!strstr(crc32c_impl(), "generic"))
>> 1820 set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags);
>> 1821 error = btrfs_fill_super(s, fs_devices, data);
>> 1822 }
>> 1823 if (!error)
>> 1824 error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL);
>> 1825 security_free_mnt_opts(&new_sec_opts);
>> 1826 if (error) {
>> 1827 deactivate_locked_super(s);
>> 1828 return ERR_PTR(error);
>> 1829 }
>> 1830
>> 1831 return dget(s->s_root);
>> 1832
>> 1833 error_close_devices:
>> 1834 btrfs_close_devices(fs_devices);
>> 1835 error_fs_info:
>> 1836 btrfs_free_fs_info(fs_info);
>> 1837 error_sec_opts:
>> 1838 security_free_mnt_opts(&new_sec_opts);
>> 1839 return ERR_PTR(error);
>> 1840 }
>> 1841
>> 1842 /*
>> 1843 * Mount function which is called by VFS layer.
>> 1844 *
>> 1845 * In order to allow mounting a subvolume directly, btrfs uses mount_subtree()
>> 1846 * which needs vfsmount* of device's root (/). This means device's root has to
>> 1847 * be mounted internally in any case.
>> 1848 *
>> 1849 * Operation flow:
>> 1850 * 1. Parse subvol id related options for later use in mount_subvol().
>> 1851 *
>> 1852 * 2. Mount device's root (/) by calling vfs_kern_mount().
>> 1853 *
>> 1854 * NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the
>> 1855 * first place. In order to avoid calling btrfs_mount() again, we use
>> 1856 * different file_system_type which is not registered to VFS by
>> 1857 * register_filesystem() (btrfs_root_fs_type). As a result,
>> 1858 * btrfs_mount_root() is called. The return value will be used by
>> 1859 * mount_subtree() in mount_subvol().
>> 1860 *
>> 1861 * 3. Call mount_subvol() to get the dentry of subvolume. Since there is
>> 1862 * "btrfs subvolume set-default", mount_subvol() is called always.
>> 1863 */
>> 1864 static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
>> 1865 const char *device_name, void *data)
>> 1866 {
>> 1867 struct vfsmount *mnt_root;
>> 1868 struct dentry *root;
>> 1869 char *subvol_name = NULL;
>> 1870 u64 subvol_objectid = 0;
>> 1871 int error = 0;
>> 1872
>> 1873 error = btrfs_parse_subvol_options(data, &subvol_name,
>> 1874 &subvol_objectid);
>> 1875 if (error) {
>> 1876 kfree(subvol_name);
>> 1877 return ERR_PTR(error);
>> 1878 }
>> 1879
>> 1880 /* mount device's root (/) */
>> 1881 mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data);
>> 1882 if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) {
>> 1883 if (flags & SB_RDONLY) {
>> 1884 mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
>> 1885 flags & ~SB_RDONLY, device_name, data);
>> 1886 } else {
>> 1887 mnt_root = vfs_kern_mount(&btrfs_root_fs_type,
>> 1888 flags | SB_RDONLY, device_name, data);
>> 1889 if (IS_ERR(mnt_root)) {
>> 1890 root = ERR_CAST(mnt_root);
>> 1891 kfree(subvol_name);
>> 1892 goto out;
>> 1893 }
>> 1894
>> 1895 down_write(&mnt_root->mnt_sb->s_umount);
>> 1896 error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL);
>> 1897 up_write(&mnt_root->mnt_sb->s_umount);
>> 1898 if (error < 0) {
>> 1899 root = ERR_PTR(error);
>> 1900 mntput(mnt_root);
>> 1901 kfree(subvol_name);
>> 1902 goto out;
>> 1903 }
>> 1904 }
>> 1905 }
>> 1906 if (IS_ERR(mnt_root)) {
>> 1907 root = ERR_CAST(mnt_root);
>> 1908 kfree(subvol_name);
>> 1909 goto out;
>> 1910 }
>> 1911
>> 1912 /* mount_subvol() will free subvol_name and mnt_root */
>> 1913 root = mount_subvol(subvol_name, subvol_objectid, mnt_root);
>> 1914
>> 1915 out:
>> 1916 return root;
>> 1917 }
>> 1918
1226 static void btrfs_resize_thread_pool(struct b 1919 static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
1227 u32 new_ 1920 u32 new_pool_size, u32 old_pool_size)
1228 { 1921 {
1229 if (new_pool_size == old_pool_size) 1922 if (new_pool_size == old_pool_size)
1230 return; 1923 return;
1231 1924
1232 fs_info->thread_pool_size = new_pool_ 1925 fs_info->thread_pool_size = new_pool_size;
1233 1926
1234 btrfs_info(fs_info, "resize thread po 1927 btrfs_info(fs_info, "resize thread pool %d -> %d",
1235 old_pool_size, new_pool_size); 1928 old_pool_size, new_pool_size);
1236 1929
1237 btrfs_workqueue_set_max(fs_info->work 1930 btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
1238 btrfs_workqueue_set_max(fs_info->dela 1931 btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
1239 btrfs_workqueue_set_max(fs_info->cach 1932 btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
1240 workqueue_set_max_active(fs_info->end !! 1933 btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);
1241 workqueue_set_max_active(fs_info->end !! 1934 btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size);
>> 1935 btrfs_workqueue_set_max(fs_info->endio_meta_write_workers,
>> 1936 new_pool_size);
1242 btrfs_workqueue_set_max(fs_info->endi 1937 btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
1243 btrfs_workqueue_set_max(fs_info->endi 1938 btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
1244 btrfs_workqueue_set_max(fs_info->dela 1939 btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
>> 1940 btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers,
>> 1941 new_pool_size);
1245 } 1942 }
1246 1943
1247 static inline void btrfs_remount_begin(struct 1944 static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,
1248 unsign !! 1945 unsigned long old_opts, int flags)
1249 { 1946 {
1250 if (btrfs_raw_test_opt(old_opts, AUTO 1947 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
1251 (!btrfs_raw_test_opt(fs_info->mou 1948 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
1252 (flags & SB_RDONLY))) { 1949 (flags & SB_RDONLY))) {
1253 /* wait for any defraggers to 1950 /* wait for any defraggers to finish */
1254 wait_event(fs_info->transacti 1951 wait_event(fs_info->transaction_wait,
1255 (atomic_read(&fs_i 1952 (atomic_read(&fs_info->defrag_running) == 0));
1256 if (flags & SB_RDONLY) 1953 if (flags & SB_RDONLY)
1257 sync_filesystem(fs_in 1954 sync_filesystem(fs_info->sb);
1258 } 1955 }
1259 } 1956 }
1260 1957
1261 static inline void btrfs_remount_cleanup(stru 1958 static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info,
1262 unsi !! 1959 unsigned long old_opts)
1263 { 1960 {
1264 const bool cache_opt = btrfs_test_opt 1961 const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
1265 1962
1266 /* 1963 /*
1267 * We need to cleanup all defragable 1964 * We need to cleanup all defragable inodes if the autodefragment is
1268 * close or the filesystem is read on 1965 * close or the filesystem is read only.
1269 */ 1966 */
1270 if (btrfs_raw_test_opt(old_opts, AUTO 1967 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
1271 (!btrfs_raw_test_opt(fs_info->mou 1968 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) {
1272 btrfs_cleanup_defrag_inodes(f 1969 btrfs_cleanup_defrag_inodes(fs_info);
1273 } 1970 }
1274 1971
1275 /* If we toggled discard async */ 1972 /* If we toggled discard async */
1276 if (!btrfs_raw_test_opt(old_opts, DIS 1973 if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
1277 btrfs_test_opt(fs_info, DISCARD_A 1974 btrfs_test_opt(fs_info, DISCARD_ASYNC))
1278 btrfs_discard_resume(fs_info) 1975 btrfs_discard_resume(fs_info);
1279 else if (btrfs_raw_test_opt(old_opts, 1976 else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) &&
1280 !btrfs_test_opt(fs_info, DIS 1977 !btrfs_test_opt(fs_info, DISCARD_ASYNC))
1281 btrfs_discard_cleanup(fs_info 1978 btrfs_discard_cleanup(fs_info);
1282 1979
1283 /* If we toggled space cache */ 1980 /* If we toggled space cache */
1284 if (cache_opt != btrfs_free_space_cac 1981 if (cache_opt != btrfs_free_space_cache_v1_active(fs_info))
1285 btrfs_set_free_space_cache_v1 1982 btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
1286 } 1983 }
1287 1984
1288 static int btrfs_remount_rw(struct btrfs_fs_i !! 1985 static int btrfs_remount(struct super_block *sb, int *flags, char *data)
1289 { 1986 {
>> 1987 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
>> 1988 unsigned old_flags = sb->s_flags;
>> 1989 unsigned long old_opts = fs_info->mount_opt;
>> 1990 unsigned long old_compress_type = fs_info->compress_type;
>> 1991 u64 old_max_inline = fs_info->max_inline;
>> 1992 u32 old_thread_pool_size = fs_info->thread_pool_size;
>> 1993 u32 old_metadata_ratio = fs_info->metadata_ratio;
1290 int ret; 1994 int ret;
1291 1995
1292 if (BTRFS_FS_ERROR(fs_info)) { !! 1996 sync_filesystem(sb);
1293 btrfs_err(fs_info, !! 1997 set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
1294 "remounting read-wr !! 1998
1295 return -EINVAL; !! 1999 if (data) {
>> 2000 void *new_sec_opts = NULL;
>> 2001
>> 2002 ret = security_sb_eat_lsm_opts(data, &new_sec_opts);
>> 2003 if (!ret)
>> 2004 ret = security_sb_remount(sb, new_sec_opts);
>> 2005 security_free_mnt_opts(&new_sec_opts);
>> 2006 if (ret)
>> 2007 goto restore;
1296 } 2008 }
1297 2009
1298 if (fs_info->fs_devices->rw_devices = !! 2010 ret = btrfs_parse_options(fs_info, data, *flags);
1299 return -EACCES; !! 2011 if (ret)
>> 2012 goto restore;
1300 2013
1301 if (!btrfs_check_rw_degradable(fs_inf !! 2014 /* V1 cache is not supported for subpage mount. */
>> 2015 if (fs_info->sectorsize < PAGE_SIZE && btrfs_test_opt(fs_info, SPACE_CACHE)) {
1302 btrfs_warn(fs_info, 2016 btrfs_warn(fs_info,
1303 "too many missing !! 2017 "v1 space cache is not supported for page size %lu with sectorsize %u",
1304 return -EACCES; !! 2018 PAGE_SIZE, fs_info->sectorsize);
>> 2019 ret = -EINVAL;
>> 2020 goto restore;
1305 } 2021 }
>> 2022 btrfs_remount_begin(fs_info, old_opts, *flags);
>> 2023 btrfs_resize_thread_pool(fs_info,
>> 2024 fs_info->thread_pool_size, old_thread_pool_size);
1306 2025
1307 if (btrfs_super_log_root(fs_info->sup !! 2026 if ((bool)btrfs_test_opt(fs_info, FREE_SPACE_TREE) !=
>> 2027 (bool)btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
>> 2028 (!sb_rdonly(sb) || (*flags & SB_RDONLY))) {
1308 btrfs_warn(fs_info, 2029 btrfs_warn(fs_info,
1309 "mount required to !! 2030 "remount supports changing free space tree only from ro to rw");
1310 return -EINVAL; !! 2031 /* Make sure free space cache options match the state on disk */
>> 2032 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
>> 2033 btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE);
>> 2034 btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE);
>> 2035 }
>> 2036 if (btrfs_free_space_cache_v1_active(fs_info)) {
>> 2037 btrfs_clear_opt(fs_info->mount_opt, FREE_SPACE_TREE);
>> 2038 btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE);
>> 2039 }
1311 } 2040 }
1312 2041
1313 /* !! 2042 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
1314 * NOTE: when remounting with a chang !! 2043 goto out;
1315 * anywhere above this point, as we a <<
1316 * until we pass the above checks. <<
1317 */ <<
1318 ret = btrfs_start_pre_rw_mount(fs_inf <<
1319 if (ret) <<
1320 return ret; <<
1321 <<
1322 btrfs_clear_sb_rdonly(fs_info->sb); <<
1323 <<
1324 set_bit(BTRFS_FS_OPEN, &fs_info->flag <<
1325 <<
1326 /* <<
1327 * If we've gone from readonly -> rea <<
1328 * sync/async discard lists in the ri <<
1329 */ <<
1330 btrfs_discard_resume(fs_info); <<
1331 <<
1332 return 0; <<
1333 } <<
1334 <<
1335 static int btrfs_remount_ro(struct btrfs_fs_i <<
1336 { <<
1337 /* <<
1338 * This also happens on 'umount -rf' <<
1339 * filesystem is busy. <<
1340 */ <<
1341 cancel_work_sync(&fs_info->async_recl <<
1342 cancel_work_sync(&fs_info->async_data <<
1343 <<
1344 btrfs_discard_cleanup(fs_info); <<
1345 <<
1346 /* Wait for the uuid_scan task to fin <<
1347 down(&fs_info->uuid_tree_rescan_sem); <<
1348 /* Avoid complains from lockdep et al <<
1349 up(&fs_info->uuid_tree_rescan_sem); <<
1350 <<
1351 btrfs_set_sb_rdonly(fs_info->sb); <<
1352 <<
1353 /* <<
1354 * Setting SB_RDONLY will put the cle <<
1355 * loop if it's already active. If i <<
1356 * unused block groups on disk until <<
1357 * unless we clean them up here. <<
1358 */ <<
1359 btrfs_delete_unused_bgs(fs_info); <<
1360 2044
1361 /* !! 2045 if (*flags & SB_RDONLY) {
1362 * The cleaner task could be already !! 2046 /*
1363 * BTRFS_FS_STATE_RO (and SB_RDONLY i !! 2047 * this also happens on 'umount -rf' or on shutdown, when
1364 * sure that after we finish the remo !! 2048 * the filesystem is busy.
1365 * btrfs_commit_super(), the cleaner !! 2049 */
1366 * - either because it was dropping a !! 2050 cancel_work_sync(&fs_info->async_reclaim_work);
1367 * or deleting an unused block grou !! 2051 cancel_work_sync(&fs_info->async_data_reclaim_work);
1368 * group from the list of unused bl <<
1369 * in the previous call to btrfs_de <<
1370 */ <<
1371 wait_on_bit(&fs_info->flags, BTRFS_FS <<
1372 2052
1373 /* !! 2053 btrfs_discard_cleanup(fs_info);
1374 * We've set the superblock to RO mod <<
1375 * cleaner task sleep without running <<
1376 * through all the delayed iputs here <<
1377 * without remounting RW we don't end <<
1378 * with a non-empty list of delayed i <<
1379 */ <<
1380 btrfs_run_delayed_iputs(fs_info); <<
1381 2054
1382 btrfs_dev_replace_suspend_for_unmount !! 2055 /* wait for the uuid_scan task to finish */
1383 btrfs_scrub_cancel(fs_info); !! 2056 down(&fs_info->uuid_tree_rescan_sem);
1384 btrfs_pause_balance(fs_info); !! 2057 /* avoid complains from lockdep et al. */
>> 2058 up(&fs_info->uuid_tree_rescan_sem);
1385 2059
1386 /* !! 2060 btrfs_set_sb_rdonly(sb);
1387 * Pause the qgroup rescan worker if <<
1388 * be still running after we are in R <<
1389 * we unmount, it might have left a t <<
1390 * the transaction and/or crash. <<
1391 */ <<
1392 btrfs_qgroup_wait_for_completion(fs_i <<
1393 2061
1394 return btrfs_commit_super(fs_info); !! 2062 /*
1395 } !! 2063 * Setting SB_RDONLY will put the cleaner thread to
>> 2064 * sleep at the next loop if it's already active.
>> 2065 * If it's already asleep, we'll leave unused block
>> 2066 * groups on disk until we're mounted read-write again
>> 2067 * unless we clean them up here.
>> 2068 */
>> 2069 btrfs_delete_unused_bgs(fs_info);
1396 2070
1397 static void btrfs_ctx_to_info(struct btrfs_fs !! 2071 /*
1398 { !! 2072 * The cleaner task could be already running before we set the
1399 fs_info->max_inline = ctx->max_inline !! 2073 * flag BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock).
1400 fs_info->commit_interval = ctx->commi !! 2074 * We must make sure that after we finish the remount, i.e. after
1401 fs_info->metadata_ratio = ctx->metada !! 2075 * we call btrfs_commit_super(), the cleaner can no longer start
1402 fs_info->thread_pool_size = ctx->thre !! 2076 * a transaction - either because it was dropping a dead root,
1403 fs_info->mount_opt = ctx->mount_opt; !! 2077 * running delayed iputs or deleting an unused block group (the
1404 fs_info->compress_type = ctx->compres !! 2078 * cleaner picked a block group from the list of unused block
1405 fs_info->compress_level = ctx->compre !! 2079 * groups before we were able to in the previous call to
1406 } !! 2080 * btrfs_delete_unused_bgs()).
1407 !! 2081 */
1408 static void btrfs_info_to_ctx(struct btrfs_fs !! 2082 wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING,
1409 { !! 2083 TASK_UNINTERRUPTIBLE);
1410 ctx->max_inline = fs_info->max_inline <<
1411 ctx->commit_interval = fs_info->commi <<
1412 ctx->metadata_ratio = fs_info->metada <<
1413 ctx->thread_pool_size = fs_info->thre <<
1414 ctx->mount_opt = fs_info->mount_opt; <<
1415 ctx->compress_type = fs_info->compres <<
1416 ctx->compress_level = fs_info->compre <<
1417 } <<
1418 <<
1419 #define btrfs_info_if_set(fs_info, old_ctx, o <<
1420 do { <<
1421 if ((!old_ctx || !btrfs_raw_test_opt( <<
1422 btrfs_raw_test_opt(fs_info->mount <<
1423 btrfs_info(fs_info, fmt, ##ar <<
1424 } while (0) <<
1425 <<
1426 #define btrfs_info_if_unset(fs_info, old_ctx, <<
1427 do { <<
1428 if ((old_ctx && btrfs_raw_test_opt(ol <<
1429 !btrfs_raw_test_opt(fs_info->moun <<
1430 btrfs_info(fs_info, fmt, ##ar <<
1431 } while (0) <<
1432 <<
1433 static void btrfs_emit_options(struct btrfs_f <<
1434 struct btrfs_f <<
1435 { <<
1436 btrfs_info_if_set(info, old, NODATASU <<
1437 btrfs_info_if_set(info, old, DEGRADED <<
1438 btrfs_info_if_set(info, old, NODATASU <<
1439 btrfs_info_if_set(info, old, SSD, "en <<
1440 btrfs_info_if_set(info, old, SSD_SPRE <<
1441 btrfs_info_if_set(info, old, NOBARRIE <<
1442 btrfs_info_if_set(info, old, NOTREELO <<
1443 btrfs_info_if_set(info, old, NOLOGREP <<
1444 btrfs_info_if_set(info, old, FLUSHONC <<
1445 btrfs_info_if_set(info, old, DISCARD_ <<
1446 btrfs_info_if_set(info, old, DISCARD_ <<
1447 btrfs_info_if_set(info, old, FREE_SPA <<
1448 btrfs_info_if_set(info, old, SPACE_CA <<
1449 btrfs_info_if_set(info, old, CLEAR_CA <<
1450 btrfs_info_if_set(info, old, AUTO_DEF <<
1451 btrfs_info_if_set(info, old, FRAGMENT <<
1452 btrfs_info_if_set(info, old, FRAGMENT <<
1453 btrfs_info_if_set(info, old, REF_VERI <<
1454 btrfs_info_if_set(info, old, USEBACKU <<
1455 btrfs_info_if_set(info, old, IGNOREBA <<
1456 btrfs_info_if_set(info, old, IGNOREDA <<
1457 btrfs_info_if_set(info, old, IGNOREME <<
1458 btrfs_info_if_set(info, old, IGNORESU <<
1459 <<
1460 btrfs_info_if_unset(info, old, NODATA <<
1461 btrfs_info_if_unset(info, old, SSD, " <<
1462 btrfs_info_if_unset(info, old, SSD_SP <<
1463 btrfs_info_if_unset(info, old, NOBARR <<
1464 btrfs_info_if_unset(info, old, NOTREE <<
1465 btrfs_info_if_unset(info, old, SPACE_ <<
1466 btrfs_info_if_unset(info, old, FREE_S <<
1467 btrfs_info_if_unset(info, old, AUTO_D <<
1468 btrfs_info_if_unset(info, old, COMPRE <<
1469 <<
1470 /* Did the compression settings chang <<
1471 if (btrfs_test_opt(info, COMPRESS) && <<
1472 (!old || <<
1473 old->compress_type != info->comp <<
1474 old->compress_level != info->com <<
1475 (!btrfs_raw_test_opt(old->mount_ <<
1476 btrfs_raw_test_opt(info->mount_ <<
1477 const char *compress_type = b <<
1478 <<
1479 btrfs_info(info, "%s %s compr <<
1480 btrfs_test_opt(inf <<
1481 compress_type, inf <<
1482 } <<
1483 2084
1484 if (info->max_inline != BTRFS_DEFAULT !! 2085 /*
1485 btrfs_info(info, "max_inline !! 2086 * We've set the superblock to RO mode, so we might have made
1486 } !! 2087 * the cleaner task sleep without running all pending delayed
>> 2088 * iputs. Go through all the delayed iputs here, so that if an
>> 2089 * unmount happens without remounting RW we don't end up at
>> 2090 * finishing close_ctree() with a non-empty list of delayed
>> 2091 * iputs.
>> 2092 */
>> 2093 btrfs_run_delayed_iputs(fs_info);
1487 2094
1488 static int btrfs_reconfigure(struct fs_contex !! 2095 btrfs_dev_replace_suspend_for_unmount(fs_info);
1489 { !! 2096 btrfs_scrub_cancel(fs_info);
1490 struct super_block *sb = fc->root->d_ !! 2097 btrfs_pause_balance(fs_info);
1491 struct btrfs_fs_info *fs_info = btrfs <<
1492 struct btrfs_fs_context *ctx = fc->fs <<
1493 struct btrfs_fs_context old_ctx; <<
1494 int ret = 0; <<
1495 bool mount_reconfigure = (fc->s_fs_in <<
1496 2098
1497 btrfs_info_to_ctx(fs_info, &old_ctx); !! 2099 /*
>> 2100 * Pause the qgroup rescan worker if it is running. We don't want
>> 2101 * it to be still running after we are in RO mode, as after that,
>> 2102 * by the time we unmount, it might have left a transaction open,
>> 2103 * so we would leak the transaction and/or crash.
>> 2104 */
>> 2105 btrfs_qgroup_wait_for_completion(fs_info, false);
1498 2106
1499 /* !! 2107 ret = btrfs_commit_super(fs_info);
1500 * This is our "bind mount" trick, we !! 2108 if (ret)
1501 * anything other than mount a differ !! 2109 goto restore;
1502 * all of the mount options should be !! 2110 } else {
1503 */ !! 2111 if (BTRFS_FS_ERROR(fs_info)) {
1504 if (mount_reconfigure) !! 2112 btrfs_err(fs_info,
1505 ctx->mount_opt = old_ctx.moun !! 2113 "Remounting read-write after error is not allowed");
>> 2114 ret = -EINVAL;
>> 2115 goto restore;
>> 2116 }
>> 2117 if (fs_info->fs_devices->rw_devices == 0) {
>> 2118 ret = -EACCES;
>> 2119 goto restore;
>> 2120 }
1506 2121
1507 sync_filesystem(sb); !! 2122 if (!btrfs_check_rw_degradable(fs_info, NULL)) {
1508 set_bit(BTRFS_FS_STATE_REMOUNTING, &f !! 2123 btrfs_warn(fs_info,
>> 2124 "too many missing devices, writable remount is not allowed");
>> 2125 ret = -EACCES;
>> 2126 goto restore;
>> 2127 }
1509 2128
1510 if (!btrfs_check_options(fs_info, &ct !! 2129 if (btrfs_super_log_root(fs_info->super_copy) != 0) {
1511 return -EINVAL; !! 2130 btrfs_warn(fs_info,
>> 2131 "mount required to replay tree-log, cannot remount read-write");
>> 2132 ret = -EINVAL;
>> 2133 goto restore;
>> 2134 }
1512 2135
1513 ret = btrfs_check_features(fs_info, ! !! 2136 /*
1514 if (ret < 0) !! 2137 * NOTE: when remounting with a change that does writes, don't
1515 return ret; !! 2138 * put it anywhere above this point, as we are not sure to be
>> 2139 * safe to write until we pass the above checks.
>> 2140 */
>> 2141 ret = btrfs_start_pre_rw_mount(fs_info);
>> 2142 if (ret)
>> 2143 goto restore;
1516 2144
1517 btrfs_ctx_to_info(fs_info, ctx); !! 2145 btrfs_clear_sb_rdonly(sb);
1518 btrfs_remount_begin(fs_info, old_ctx. <<
1519 btrfs_resize_thread_pool(fs_info, fs_ <<
1520 old_ctx.thre <<
1521 2146
1522 if ((bool)btrfs_test_opt(fs_info, FRE !! 2147 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
1523 (bool)btrfs_fs_compat_ro(fs_info, <<
1524 (!sb_rdonly(sb) || (fc->sb_flags <<
1525 btrfs_warn(fs_info, <<
1526 "remount supports changing fr <<
1527 /* Make sure free space cache <<
1528 if (btrfs_fs_compat_ro(fs_inf <<
1529 btrfs_set_opt(fs_info <<
1530 btrfs_clear_opt(fs_in <<
1531 } <<
1532 if (btrfs_free_space_cache_v1 <<
1533 btrfs_clear_opt(fs_in <<
1534 btrfs_set_opt(fs_info <<
1535 } <<
1536 } 2148 }
1537 !! 2149 out:
1538 ret = 0; <<
1539 if (!sb_rdonly(sb) && (fc->sb_flags & <<
1540 ret = btrfs_remount_ro(fs_inf <<
1541 else if (sb_rdonly(sb) && !(fc->sb_fl <<
1542 ret = btrfs_remount_rw(fs_inf <<
1543 if (ret) <<
1544 goto restore; <<
1545 <<
1546 /* 2150 /*
1547 * If we set the mask during the para !! 2151 * We need to set SB_I_VERSION here otherwise it'll get cleared by VFS,
1548 * remount. Here we can set the mask !! 2152 * since the absence of the flag means it can be toggled off by remount.
1549 * appropriately. <<
1550 */ 2153 */
1551 if ((fc->sb_flags & SB_POSIXACL) != ( !! 2154 *flags |= SB_I_VERSION;
1552 fc->sb_flags_mask |= SB_POSIX <<
1553 2155
1554 btrfs_emit_options(fs_info, &old_ctx) <<
1555 wake_up_process(fs_info->transaction_ 2156 wake_up_process(fs_info->transaction_kthread);
1556 btrfs_remount_cleanup(fs_info, old_ct !! 2157 btrfs_remount_cleanup(fs_info, old_opts);
1557 btrfs_clear_oneshot_options(fs_info); 2158 btrfs_clear_oneshot_options(fs_info);
1558 clear_bit(BTRFS_FS_STATE_REMOUNTING, 2159 clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
1559 2160
1560 return 0; 2161 return 0;
>> 2162
1561 restore: 2163 restore:
1562 btrfs_ctx_to_info(fs_info, &old_ctx); !! 2164 /* We've hit an error - don't reset SB_RDONLY */
1563 btrfs_remount_cleanup(fs_info, old_ct !! 2165 if (sb_rdonly(sb))
>> 2166 old_flags |= SB_RDONLY;
>> 2167 if (!(old_flags & SB_RDONLY))
>> 2168 clear_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
>> 2169 sb->s_flags = old_flags;
>> 2170 fs_info->mount_opt = old_opts;
>> 2171 fs_info->compress_type = old_compress_type;
>> 2172 fs_info->max_inline = old_max_inline;
>> 2173 btrfs_resize_thread_pool(fs_info,
>> 2174 old_thread_pool_size, fs_info->thread_pool_size);
>> 2175 fs_info->metadata_ratio = old_metadata_ratio;
>> 2176 btrfs_remount_cleanup(fs_info, old_opts);
1564 clear_bit(BTRFS_FS_STATE_REMOUNTING, 2177 clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
>> 2178
1565 return ret; 2179 return ret;
1566 } 2180 }
1567 2181
1568 /* Used to sort the devices by max_avail(desc 2182 /* Used to sort the devices by max_avail(descending sort) */
1569 static int btrfs_cmp_device_free_bytes(const 2183 static int btrfs_cmp_device_free_bytes(const void *a, const void *b)
1570 { 2184 {
1571 const struct btrfs_device_info *dev_i 2185 const struct btrfs_device_info *dev_info1 = a;
1572 const struct btrfs_device_info *dev_i 2186 const struct btrfs_device_info *dev_info2 = b;
1573 2187
1574 if (dev_info1->max_avail > dev_info2- 2188 if (dev_info1->max_avail > dev_info2->max_avail)
1575 return -1; 2189 return -1;
1576 else if (dev_info1->max_avail < dev_i 2190 else if (dev_info1->max_avail < dev_info2->max_avail)
1577 return 1; 2191 return 1;
1578 return 0; 2192 return 0;
1579 } 2193 }
1580 2194
1581 /* 2195 /*
1582 * sort the devices by max_avail, in which ma 2196 * sort the devices by max_avail, in which max free extent size of each device
1583 * is stored.(Descending Sort) 2197 * is stored.(Descending Sort)
1584 */ 2198 */
1585 static inline void btrfs_descending_sort_devi 2199 static inline void btrfs_descending_sort_devices(
1586 struc 2200 struct btrfs_device_info *devices,
1587 size_ 2201 size_t nr_devices)
1588 { 2202 {
1589 sort(devices, nr_devices, sizeof(stru 2203 sort(devices, nr_devices, sizeof(struct btrfs_device_info),
1590 btrfs_cmp_device_free_bytes, NUL 2204 btrfs_cmp_device_free_bytes, NULL);
1591 } 2205 }
1592 2206
1593 /* 2207 /*
1594 * The helper to calc the free space on the d 2208 * The helper to calc the free space on the devices that can be used to store
1595 * file data. 2209 * file data.
1596 */ 2210 */
1597 static inline int btrfs_calc_avail_data_space 2211 static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info,
1598 2212 u64 *free_bytes)
1599 { 2213 {
1600 struct btrfs_device_info *devices_inf 2214 struct btrfs_device_info *devices_info;
1601 struct btrfs_fs_devices *fs_devices = 2215 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
1602 struct btrfs_device *device; 2216 struct btrfs_device *device;
1603 u64 type; 2217 u64 type;
1604 u64 avail_space; 2218 u64 avail_space;
1605 u64 min_stripe_size; 2219 u64 min_stripe_size;
1606 int num_stripes = 1; 2220 int num_stripes = 1;
1607 int i = 0, nr_devices; 2221 int i = 0, nr_devices;
1608 const struct btrfs_raid_attr *rattr; 2222 const struct btrfs_raid_attr *rattr;
1609 2223
1610 /* 2224 /*
1611 * We aren't under the device list lo 2225 * We aren't under the device list lock, so this is racy-ish, but good
1612 * enough for our purposes. 2226 * enough for our purposes.
1613 */ 2227 */
1614 nr_devices = fs_info->fs_devices->ope 2228 nr_devices = fs_info->fs_devices->open_devices;
1615 if (!nr_devices) { 2229 if (!nr_devices) {
1616 smp_mb(); 2230 smp_mb();
1617 nr_devices = fs_info->fs_devi 2231 nr_devices = fs_info->fs_devices->open_devices;
1618 ASSERT(nr_devices); 2232 ASSERT(nr_devices);
1619 if (!nr_devices) { 2233 if (!nr_devices) {
1620 *free_bytes = 0; 2234 *free_bytes = 0;
1621 return 0; 2235 return 0;
1622 } 2236 }
1623 } 2237 }
1624 2238
1625 devices_info = kmalloc_array(nr_devic 2239 devices_info = kmalloc_array(nr_devices, sizeof(*devices_info),
1626 GFP_KERNEL); 2240 GFP_KERNEL);
1627 if (!devices_info) 2241 if (!devices_info)
1628 return -ENOMEM; 2242 return -ENOMEM;
1629 2243
1630 /* calc min stripe number for data sp 2244 /* calc min stripe number for data space allocation */
1631 type = btrfs_data_alloc_profile(fs_in 2245 type = btrfs_data_alloc_profile(fs_info);
1632 rattr = &btrfs_raid_array[btrfs_bg_fl 2246 rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)];
1633 2247
1634 if (type & BTRFS_BLOCK_GROUP_RAID0) 2248 if (type & BTRFS_BLOCK_GROUP_RAID0)
1635 num_stripes = nr_devices; 2249 num_stripes = nr_devices;
1636 else if (type & BTRFS_BLOCK_GROUP_RAI !! 2250 else if (type & BTRFS_BLOCK_GROUP_RAID1)
1637 num_stripes = rattr->ncopies; !! 2251 num_stripes = 2;
>> 2252 else if (type & BTRFS_BLOCK_GROUP_RAID1C3)
>> 2253 num_stripes = 3;
>> 2254 else if (type & BTRFS_BLOCK_GROUP_RAID1C4)
>> 2255 num_stripes = 4;
1638 else if (type & BTRFS_BLOCK_GROUP_RAI 2256 else if (type & BTRFS_BLOCK_GROUP_RAID10)
1639 num_stripes = 4; 2257 num_stripes = 4;
1640 2258
1641 /* Adjust for more than 1 stripe per 2259 /* Adjust for more than 1 stripe per device */
1642 min_stripe_size = rattr->dev_stripes 2260 min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN;
1643 2261
1644 rcu_read_lock(); 2262 rcu_read_lock();
1645 list_for_each_entry_rcu(device, &fs_d 2263 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
1646 if (!test_bit(BTRFS_DEV_STATE 2264 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA,
1647 2265 &device->dev_state) ||
1648 !device->bdev || 2266 !device->bdev ||
1649 test_bit(BTRFS_DEV_STATE_ 2267 test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state))
1650 continue; 2268 continue;
1651 2269
1652 if (i >= nr_devices) 2270 if (i >= nr_devices)
1653 break; 2271 break;
1654 2272
1655 avail_space = device->total_b 2273 avail_space = device->total_bytes - device->bytes_used;
1656 2274
1657 /* align with stripe_len */ 2275 /* align with stripe_len */
1658 avail_space = rounddown(avail 2276 avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN);
1659 2277
1660 /* 2278 /*
1661 * Ensure we have at least mi !! 2279 * In order to avoid overwriting the superblock on the drive,
1662 * reserved space on the devi !! 2280 * btrfs starts at an offset of at least 1MB when doing chunk
>> 2281 * allocation.
>> 2282 *
>> 2283 * This ensures we have at least min_stripe_size free space
>> 2284 * after excluding 1MB.
1663 */ 2285 */
1664 if (avail_space <= BTRFS_DEVI !! 2286 if (avail_space <= SZ_1M + min_stripe_size)
1665 continue; 2287 continue;
1666 2288
1667 avail_space -= BTRFS_DEVICE_R !! 2289 avail_space -= SZ_1M;
1668 2290
1669 devices_info[i].dev = device; 2291 devices_info[i].dev = device;
1670 devices_info[i].max_avail = a 2292 devices_info[i].max_avail = avail_space;
1671 2293
1672 i++; 2294 i++;
1673 } 2295 }
1674 rcu_read_unlock(); 2296 rcu_read_unlock();
1675 2297
1676 nr_devices = i; 2298 nr_devices = i;
1677 2299
1678 btrfs_descending_sort_devices(devices 2300 btrfs_descending_sort_devices(devices_info, nr_devices);
1679 2301
1680 i = nr_devices - 1; 2302 i = nr_devices - 1;
1681 avail_space = 0; 2303 avail_space = 0;
1682 while (nr_devices >= rattr->devs_min) 2304 while (nr_devices >= rattr->devs_min) {
1683 num_stripes = min(num_stripes 2305 num_stripes = min(num_stripes, nr_devices);
1684 2306
1685 if (devices_info[i].max_avail 2307 if (devices_info[i].max_avail >= min_stripe_size) {
1686 int j; 2308 int j;
1687 u64 alloc_size; 2309 u64 alloc_size;
1688 2310
1689 avail_space += device 2311 avail_space += devices_info[i].max_avail * num_stripes;
1690 alloc_size = devices_ 2312 alloc_size = devices_info[i].max_avail;
1691 for (j = i + 1 - num_ 2313 for (j = i + 1 - num_stripes; j <= i; j++)
1692 devices_info[ 2314 devices_info[j].max_avail -= alloc_size;
1693 } 2315 }
1694 i--; 2316 i--;
1695 nr_devices--; 2317 nr_devices--;
1696 } 2318 }
1697 2319
1698 kfree(devices_info); 2320 kfree(devices_info);
1699 *free_bytes = avail_space; 2321 *free_bytes = avail_space;
1700 return 0; 2322 return 0;
1701 } 2323 }
1702 2324
1703 /* 2325 /*
1704 * Calculate numbers for 'df', pessimistic in 2326 * Calculate numbers for 'df', pessimistic in case of mixed raid profiles.
1705 * 2327 *
1706 * If there's a redundant raid level at DATA 2328 * If there's a redundant raid level at DATA block groups, use the respective
1707 * multiplier to scale the sizes. 2329 * multiplier to scale the sizes.
1708 * 2330 *
1709 * Unused device space usage is based on simu 2331 * Unused device space usage is based on simulating the chunk allocator
1710 * algorithm that respects the device sizes a 2332 * algorithm that respects the device sizes and order of allocations. This is
1711 * a close approximation of the actual use bu 2333 * a close approximation of the actual use but there are other factors that may
1712 * change the result (like a new metadata chu 2334 * change the result (like a new metadata chunk).
1713 * 2335 *
1714 * If metadata is exhausted, f_bavail will be 2336 * If metadata is exhausted, f_bavail will be 0.
1715 */ 2337 */
1716 static int btrfs_statfs(struct dentry *dentry 2338 static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1717 { 2339 {
1718 struct btrfs_fs_info *fs_info = btrfs 2340 struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
1719 struct btrfs_super_block *disk_super 2341 struct btrfs_super_block *disk_super = fs_info->super_copy;
1720 struct btrfs_space_info *found; 2342 struct btrfs_space_info *found;
1721 u64 total_used = 0; 2343 u64 total_used = 0;
1722 u64 total_free_data = 0; 2344 u64 total_free_data = 0;
1723 u64 total_free_meta = 0; 2345 u64 total_free_meta = 0;
1724 u32 bits = fs_info->sectorsize_bits; 2346 u32 bits = fs_info->sectorsize_bits;
1725 __be32 *fsid = (__be32 *)fs_info->fs_ 2347 __be32 *fsid = (__be32 *)fs_info->fs_devices->fsid;
1726 unsigned factor = 1; 2348 unsigned factor = 1;
1727 struct btrfs_block_rsv *block_rsv = & 2349 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
1728 int ret; 2350 int ret;
1729 u64 thresh = 0; 2351 u64 thresh = 0;
1730 int mixed = 0; 2352 int mixed = 0;
1731 2353
1732 list_for_each_entry(found, &fs_info-> 2354 list_for_each_entry(found, &fs_info->space_info, list) {
1733 if (found->flags & BTRFS_BLOC 2355 if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
1734 int i; 2356 int i;
1735 2357
1736 total_free_data += fo 2358 total_free_data += found->disk_total - found->disk_used;
1737 total_free_data -= 2359 total_free_data -=
1738 btrfs_account 2360 btrfs_account_ro_block_groups_free_space(found);
1739 2361
1740 for (i = 0; i < BTRFS 2362 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
1741 if (!list_emp 2363 if (!list_empty(&found->block_groups[i]))
1742 facto 2364 factor = btrfs_bg_type_to_factor(
1743 2365 btrfs_raid_array[i].bg_flag);
1744 } 2366 }
1745 } 2367 }
1746 2368
1747 /* 2369 /*
1748 * Metadata in mixed block gr !! 2370 * Metadata in mixed block goup profiles are accounted in data
1749 */ 2371 */
1750 if (!mixed && found->flags & 2372 if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) {
1751 if (found->flags & BT 2373 if (found->flags & BTRFS_BLOCK_GROUP_DATA)
1752 mixed = 1; 2374 mixed = 1;
1753 else 2375 else
1754 total_free_me 2376 total_free_meta += found->disk_total -
1755 found 2377 found->disk_used;
1756 } 2378 }
1757 2379
1758 total_used += found->disk_use 2380 total_used += found->disk_used;
1759 } 2381 }
1760 2382
1761 buf->f_blocks = div_u64(btrfs_super_t 2383 buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor);
1762 buf->f_blocks >>= bits; 2384 buf->f_blocks >>= bits;
1763 buf->f_bfree = buf->f_blocks - (div_u 2385 buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits);
1764 2386
1765 /* Account global block reserve as us 2387 /* Account global block reserve as used, it's in logical size already */
1766 spin_lock(&block_rsv->lock); 2388 spin_lock(&block_rsv->lock);
1767 /* Mixed block groups accounting is n 2389 /* Mixed block groups accounting is not byte-accurate, avoid overflow */
1768 if (buf->f_bfree >= block_rsv->size > 2390 if (buf->f_bfree >= block_rsv->size >> bits)
1769 buf->f_bfree -= block_rsv->si 2391 buf->f_bfree -= block_rsv->size >> bits;
1770 else 2392 else
1771 buf->f_bfree = 0; 2393 buf->f_bfree = 0;
1772 spin_unlock(&block_rsv->lock); 2394 spin_unlock(&block_rsv->lock);
1773 2395
1774 buf->f_bavail = div_u64(total_free_da 2396 buf->f_bavail = div_u64(total_free_data, factor);
1775 ret = btrfs_calc_avail_data_space(fs_ 2397 ret = btrfs_calc_avail_data_space(fs_info, &total_free_data);
1776 if (ret) 2398 if (ret)
1777 return ret; 2399 return ret;
1778 buf->f_bavail += div_u64(total_free_d 2400 buf->f_bavail += div_u64(total_free_data, factor);
1779 buf->f_bavail = buf->f_bavail >> bits 2401 buf->f_bavail = buf->f_bavail >> bits;
1780 2402
1781 /* 2403 /*
1782 * We calculate the remaining metadat 2404 * We calculate the remaining metadata space minus global reserve. If
1783 * this is (supposedly) smaller than 2405 * this is (supposedly) smaller than zero, there's no space. But this
1784 * does not hold in practice, the exh 2406 * does not hold in practice, the exhausted state happens where's still
1785 * some positive delta. So we apply s 2407 * some positive delta. So we apply some guesswork and compare the
1786 * delta to a 4M threshold. (Practic 2408 * delta to a 4M threshold. (Practically observed delta was ~2M.)
1787 * 2409 *
1788 * We probably cannot calculate the e 2410 * We probably cannot calculate the exact threshold value because this
1789 * depends on the internal reservatio 2411 * depends on the internal reservations requested by various
1790 * operations, so some operations tha 2412 * operations, so some operations that consume a few metadata will
1791 * succeed even if the Avail is zero. 2413 * succeed even if the Avail is zero. But this is better than the other
1792 * way around. 2414 * way around.
1793 */ 2415 */
1794 thresh = SZ_4M; 2416 thresh = SZ_4M;
1795 2417
1796 /* 2418 /*
1797 * We only want to claim there's no a 2419 * We only want to claim there's no available space if we can no longer
1798 * allocate chunks for our metadata p 2420 * allocate chunks for our metadata profile and our global reserve will
1799 * not fit in the free metadata space 2421 * not fit in the free metadata space. If we aren't ->full then we
1800 * still can allocate chunks and thus 2422 * still can allocate chunks and thus are fine using the currently
1801 * calculated f_bavail. 2423 * calculated f_bavail.
1802 */ 2424 */
1803 if (!mixed && block_rsv->space_info-> 2425 if (!mixed && block_rsv->space_info->full &&
1804 (total_free_meta < thresh || tota !! 2426 total_free_meta - thresh < block_rsv->size)
1805 buf->f_bavail = 0; 2427 buf->f_bavail = 0;
1806 2428
1807 buf->f_type = BTRFS_SUPER_MAGIC; 2429 buf->f_type = BTRFS_SUPER_MAGIC;
1808 buf->f_bsize = fs_info->sectorsize; !! 2430 buf->f_bsize = dentry->d_sb->s_blocksize;
1809 buf->f_namelen = BTRFS_NAME_LEN; 2431 buf->f_namelen = BTRFS_NAME_LEN;
1810 2432
1811 /* We treat it as constant endianness 2433 /* We treat it as constant endianness (it doesn't matter _which_)
1812 because we want the fsid to come o 2434 because we want the fsid to come out the same whether mounted
1813 on a big-endian or little-endian h 2435 on a big-endian or little-endian host */
1814 buf->f_fsid.val[0] = be32_to_cpu(fsid 2436 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
1815 buf->f_fsid.val[1] = be32_to_cpu(fsid 2437 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
1816 /* Mask in the root object ID too, to 2438 /* Mask in the root object ID too, to disambiguate subvols */
1817 buf->f_fsid.val[0] ^= btrfs_root_id(B !! 2439 buf->f_fsid.val[0] ^=
1818 buf->f_fsid.val[1] ^= btrfs_root_id(B !! 2440 BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32;
>> 2441 buf->f_fsid.val[1] ^=
>> 2442 BTRFS_I(d_inode(dentry))->root->root_key.objectid;
1819 2443
1820 return 0; 2444 return 0;
1821 } 2445 }
1822 2446
1823 static int btrfs_fc_test_super(struct super_b <<
1824 { <<
1825 struct btrfs_fs_info *p = fc->s_fs_in <<
1826 struct btrfs_fs_info *fs_info = btrfs <<
1827 <<
1828 return fs_info->fs_devices == p->fs_d <<
1829 } <<
1830 <<
1831 static int btrfs_get_tree_super(struct fs_con <<
1832 { <<
1833 struct btrfs_fs_info *fs_info = fc->s <<
1834 struct btrfs_fs_context *ctx = fc->fs <<
1835 struct btrfs_fs_devices *fs_devices = <<
1836 struct block_device *bdev; <<
1837 struct btrfs_device *device; <<
1838 struct super_block *sb; <<
1839 blk_mode_t mode = btrfs_open_mode(fc) <<
1840 int ret; <<
1841 <<
1842 btrfs_ctx_to_info(fs_info, ctx); <<
1843 mutex_lock(&uuid_mutex); <<
1844 <<
1845 /* <<
1846 * With 'true' passed to btrfs_scan_o <<
1847 * either a valid device or an error. <<
1848 */ <<
1849 device = btrfs_scan_one_device(fc->so <<
1850 ASSERT(device != NULL); <<
1851 if (IS_ERR(device)) { <<
1852 mutex_unlock(&uuid_mutex); <<
1853 return PTR_ERR(device); <<
1854 } <<
1855 <<
1856 fs_devices = device->fs_devices; <<
1857 fs_info->fs_devices = fs_devices; <<
1858 <<
1859 ret = btrfs_open_devices(fs_devices, <<
1860 mutex_unlock(&uuid_mutex); <<
1861 if (ret) <<
1862 return ret; <<
1863 <<
1864 if (!(fc->sb_flags & SB_RDONLY) && fs <<
1865 ret = -EACCES; <<
1866 goto error; <<
1867 } <<
1868 <<
1869 bdev = fs_devices->latest_dev->bdev; <<
1870 <<
1871 /* <<
1872 * From now on the error handling is <<
1873 * <<
1874 * If successful, this will transfer <<
1875 * and fc->s_fs_info will be NULL. H <<
1876 * super, we'll still have fc->s_fs_i <<
1877 * completely out it'll be cleaned up <<
1878 * otherwise it's tied to the lifetim <<
1879 */ <<
1880 sb = sget_fc(fc, btrfs_fc_test_super, <<
1881 if (IS_ERR(sb)) { <<
1882 ret = PTR_ERR(sb); <<
1883 goto error; <<
1884 } <<
1885 <<
1886 set_device_specific_options(fs_info); <<
1887 <<
1888 if (sb->s_root) { <<
1889 btrfs_close_devices(fs_device <<
1890 if ((fc->sb_flags ^ sb->s_fla <<
1891 ret = -EBUSY; <<
1892 } else { <<
1893 snprintf(sb->s_id, sizeof(sb- <<
1894 shrinker_debugfs_rename(sb->s <<
1895 btrfs_sb(sb)->bdev_holder = & <<
1896 ret = btrfs_fill_super(sb, fs <<
1897 } <<
1898 <<
1899 if (ret) { <<
1900 deactivate_locked_super(sb); <<
1901 return ret; <<
1902 } <<
1903 <<
1904 btrfs_clear_oneshot_options(fs_info); <<
1905 <<
1906 fc->root = dget(sb->s_root); <<
1907 return 0; <<
1908 <<
1909 error: <<
1910 btrfs_close_devices(fs_devices); <<
1911 return ret; <<
1912 } <<
1913 <<
1914 /* <<
1915 * Ever since commit 0723a0473fb4 ("btrfs: al <<
1916 * with different ro/rw options") the followi <<
1917 * <<
1918 * (i) mount /dev/sda3 -o subvol=foo,r <<
1919 * (ii) mount /dev/sda3 -o subvol=bar,r <<
1920 * <<
1921 * which looks nice and innocent but is actua <<
1922 * a long comment. <<
1923 * <<
1924 * On another filesystem a subvolume mount is <<
1925 * <<
1926 * (iii) # create rw superblock + initia <<
1927 * mount -t xfs /dev/sdb /opt/ <<
1928 * <<
1929 * # create ro bind mount <<
1930 * mount --bind -o ro /opt/foo /mn <<
1931 * <<
1932 * # unmount initial mount <<
1933 * umount /opt <<
1934 * <<
1935 * Of course, there's some special subvolume <<
1936 * sb->s_root dentry is really swapped after <<
1937 * it's very close and will help us understan <<
1938 * <<
1939 * The old mount API didn't cleanly distingui <<
1940 * and a superblock being made ro. The only <<
1941 * either object was by passing ms_rdonly. If <<
1942 * mount(2) such as: <<
1943 * <<
1944 * mount("/dev/sdb", "/mnt", "xfs", ms_r <<
1945 * <<
1946 * the MS_RDONLY flag being specified had two <<
1947 * <<
1948 * (1) MNT_READONLY was raised -> the resulti <<
1949 * @mnt->mnt_flags |= MNT_READONLY raised <<
1950 * <<
1951 * (2) MS_RDONLY was passed to the filesystem <<
1952 * made the superblock ro. Note, how SB_R <<
1953 * ms_rdonly and is raised whenever MS_RD <<
1954 * <<
1955 * Creating a subtree mount via (iii) ends up <<
1956 * subtree mounted ro. <<
1957 * <<
1958 * But consider the effect on the old mount A <<
1959 * which combines the distinct step in (iii) <<
1960 * <<
1961 * By issuing (i) both the mount and the supe <<
1962 * is issued the superblock is ro and thus ev <<
1963 * rw it wouldn't help. Hence, btrfs needed t <<
1964 * to rw for (ii) which it did using an inter <<
1965 * <<
1966 * IOW, subvolume mounting was inherently com <<
1967 * MS_RDONLY in mount(2). Note, this ambiguit <<
1968 * "ro" to MS_RDONLY. IOW, in both (i) and (i <<
1969 * passed by mount(8) to mount(2). <<
1970 * <<
1971 * Enter the new mount API. The new mount API <<
1972 * and making a superblock ro. <<
1973 * <<
1974 * (3) To turn a mount ro the MOUNT_ATTR_ONLY <<
1975 * fsmount() or mount_setattr() this is a <<
1976 * specific mount or mount tree that is n <<
1977 * <<
1978 * (4) To turn a superblock ro the "ro" flag <<
1979 * fsconfig(FSCONFIG_SET_FLAG, "ro"). Thi <<
1980 * in fc->sb_flags. <<
1981 * <<
1982 * But, currently the util-linux mount comman <<
1983 * API and is still setting fsconfig(FSCONFIG <<
1984 * btrfs or not, setting the whole super bloc <<
1985 * work with different options work we need t <<
1986 */ <<
1987 static struct vfsmount *btrfs_reconfigure_for <<
1988 { <<
1989 struct vfsmount *mnt; <<
1990 int ret; <<
1991 const bool ro2rw = !(fc->sb_flags & S <<
1992 <<
1993 /* <<
1994 * We got an EBUSY because our SB_RDO <<
1995 * super block, so invert our setting <<
1996 * can get our vfsmount. <<
1997 */ <<
1998 if (ro2rw) <<
1999 fc->sb_flags |= SB_RDONLY; <<
2000 else <<
2001 fc->sb_flags &= ~SB_RDONLY; <<
2002 <<
2003 mnt = fc_mount(fc); <<
2004 if (IS_ERR(mnt)) <<
2005 return mnt; <<
2006 <<
2007 if (!ro2rw) <<
2008 return mnt; <<
2009 <<
2010 /* We need to convert to rw, call rec <<
2011 fc->sb_flags &= ~SB_RDONLY; <<
2012 down_write(&mnt->mnt_sb->s_umount); <<
2013 ret = btrfs_reconfigure(fc); <<
2014 up_write(&mnt->mnt_sb->s_umount); <<
2015 if (ret) { <<
2016 mntput(mnt); <<
2017 return ERR_PTR(ret); <<
2018 } <<
2019 return mnt; <<
2020 } <<
2021 <<
2022 static int btrfs_get_tree_subvol(struct fs_co <<
2023 { <<
2024 struct btrfs_fs_info *fs_info = NULL; <<
2025 struct btrfs_fs_context *ctx = fc->fs <<
2026 struct fs_context *dup_fc; <<
2027 struct dentry *dentry; <<
2028 struct vfsmount *mnt; <<
2029 <<
2030 /* <<
2031 * Setup a dummy root and fs_info for <<
2032 * we don't actually fill this stuff <<
2033 * then open_ctree will properly init <<
2034 * settings later. btrfs_init_fs_inf <<
2035 * of the fs_info (locks and such) to <<
2036 * superblock with our given fs_devic <<
2037 */ <<
2038 fs_info = kvzalloc(sizeof(struct btrf <<
2039 if (!fs_info) <<
2040 return -ENOMEM; <<
2041 <<
2042 fs_info->super_copy = kzalloc(BTRFS_S <<
2043 fs_info->super_for_commit = kzalloc(B <<
2044 if (!fs_info->super_copy || !fs_info- <<
2045 btrfs_free_fs_info(fs_info); <<
2046 return -ENOMEM; <<
2047 } <<
2048 btrfs_init_fs_info(fs_info); <<
2049 <<
2050 dup_fc = vfs_dup_fs_context(fc); <<
2051 if (IS_ERR(dup_fc)) { <<
2052 btrfs_free_fs_info(fs_info); <<
2053 return PTR_ERR(dup_fc); <<
2054 } <<
2055 <<
2056 /* <<
2057 * When we do the sget_fc this gets t <<
2058 * need to set it on the dup_fc as th <<
2059 */ <<
2060 dup_fc->s_fs_info = fs_info; <<
2061 <<
2062 /* <<
2063 * We'll do the security settings in <<
2064 * loop, they were duplicated into du <<
2065 * here. <<
2066 */ <<
2067 security_free_mnt_opts(&fc->security) <<
2068 fc->security = NULL; <<
2069 <<
2070 mnt = fc_mount(dup_fc); <<
2071 if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) <<
2072 mnt = btrfs_reconfigure_for_m <<
2073 put_fs_context(dup_fc); <<
2074 if (IS_ERR(mnt)) <<
2075 return PTR_ERR(mnt); <<
2076 <<
2077 /* <<
2078 * This free's ->subvol_name, because <<
2079 * allocate a buffer to hold the subv <<
2080 * reference to it here. <<
2081 */ <<
2082 dentry = mount_subvol(ctx->subvol_nam <<
2083 ctx->subvol_name = NULL; <<
2084 if (IS_ERR(dentry)) <<
2085 return PTR_ERR(dentry); <<
2086 <<
2087 fc->root = dentry; <<
2088 return 0; <<
2089 } <<
2090 <<
2091 static int btrfs_get_tree(struct fs_context * <<
2092 { <<
2093 /* <<
2094 * Since we use mount_subtree to moun <<
2095 * have to do mounts in two steps. <<
2096 * <<
2097 * First pass through we call btrfs_g <<
2098 * wrapper around fc_mount() to call <<
2099 * we'll call btrfs_get_tree_super(). <<
2100 * everything to open the devices and <<
2101 * with a fully constructed vfsmount <<
2102 * from there we can do our mount_sub <<
2103 * whichever subvol we're mounting an <<
2104 * appropriate dentry for the subvol. <<
2105 */ <<
2106 if (fc->s_fs_info) <<
2107 return btrfs_get_tree_super(f <<
2108 return btrfs_get_tree_subvol(fc); <<
2109 } <<
2110 <<
2111 static void btrfs_kill_super(struct super_blo 2447 static void btrfs_kill_super(struct super_block *sb)
2112 { 2448 {
2113 struct btrfs_fs_info *fs_info = btrfs 2449 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2114 kill_anon_super(sb); 2450 kill_anon_super(sb);
2115 btrfs_free_fs_info(fs_info); 2451 btrfs_free_fs_info(fs_info);
2116 } 2452 }
2117 2453
2118 static void btrfs_free_fs_context(struct fs_c !! 2454 static struct file_system_type btrfs_fs_type = {
2119 { !! 2455 .owner = THIS_MODULE,
2120 struct btrfs_fs_context *ctx = fc->fs !! 2456 .name = "btrfs",
2121 struct btrfs_fs_info *fs_info = fc->s !! 2457 .mount = btrfs_mount,
2122 !! 2458 .kill_sb = btrfs_kill_super,
2123 if (fs_info) !! 2459 .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
2124 btrfs_free_fs_info(fs_info); <<
2125 <<
2126 if (ctx && refcount_dec_and_test(&ctx <<
2127 kfree(ctx->subvol_name); <<
2128 kfree(ctx); <<
2129 } <<
2130 } <<
2131 <<
2132 static int btrfs_dup_fs_context(struct fs_con <<
2133 { <<
2134 struct btrfs_fs_context *ctx = src_fc <<
2135 <<
2136 /* <<
2137 * Give a ref to our ctx to this dup, <<
2138 * our original fc so we can have the <<
2139 * <<
2140 * We unset ->source in the original <<
2141 * mounting, and then once we free th <<
2142 * need to make sure we're only point <<
2143 */ <<
2144 refcount_inc(&ctx->refs); <<
2145 fc->fs_private = ctx; <<
2146 fc->source = src_fc->source; <<
2147 src_fc->source = NULL; <<
2148 return 0; <<
2149 } <<
2150 <<
2151 static const struct fs_context_operations btr <<
2152 .parse_param = btrfs_parse_param, <<
2153 .reconfigure = btrfs_reconfigure, <<
2154 .get_tree = btrfs_get_tree, <<
2155 .dup = btrfs_dup_fs_contex <<
2156 .free = btrfs_free_fs_conte <<
2157 }; 2460 };
2158 2461
2159 static int btrfs_init_fs_context(struct fs_co !! 2462 static struct file_system_type btrfs_root_fs_type = {
2160 { !! 2463 .owner = THIS_MODULE,
2161 struct btrfs_fs_context *ctx; !! 2464 .name = "btrfs",
2162 !! 2465 .mount = btrfs_mount_root,
2163 ctx = kzalloc(sizeof(struct btrfs_fs_ !! 2466 .kill_sb = btrfs_kill_super,
2164 if (!ctx) !! 2467 .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_ALLOW_IDMAP,
2165 return -ENOMEM; !! 2468 };
2166 <<
2167 refcount_set(&ctx->refs, 1); <<
2168 fc->fs_private = ctx; <<
2169 fc->ops = &btrfs_fs_context_ops; <<
2170 <<
2171 if (fc->purpose == FS_CONTEXT_FOR_REC <<
2172 btrfs_info_to_ctx(btrfs_sb(fc <<
2173 } else { <<
2174 ctx->thread_pool_size = <<
2175 min_t(unsigned long, <<
2176 ctx->max_inline = BTRFS_DEFAU <<
2177 ctx->commit_interval = BTRFS_ <<
2178 } <<
2179 <<
2180 #ifdef CONFIG_BTRFS_FS_POSIX_ACL <<
2181 fc->sb_flags |= SB_POSIXACL; <<
2182 #endif <<
2183 fc->sb_flags |= SB_I_VERSION; <<
2184 <<
2185 return 0; <<
2186 } <<
2187 <<
2188 static struct file_system_type btrfs_fs_type <<
2189 .owner = THIS_MODULE <<
2190 .name = "btrfs", <<
2191 .init_fs_context = btrfs_init_ <<
2192 .parameters = btrfs_fs_pa <<
2193 .kill_sb = btrfs_kill_ <<
2194 .fs_flags = FS_REQUIRES <<
2195 }; <<
2196 2469
2197 MODULE_ALIAS_FS("btrfs"); 2470 MODULE_ALIAS_FS("btrfs");
2198 2471
2199 static int btrfs_control_open(struct inode *i 2472 static int btrfs_control_open(struct inode *inode, struct file *file)
2200 { 2473 {
2201 /* 2474 /*
2202 * The control file's private_data is 2475 * The control file's private_data is used to hold the
2203 * transaction when it is started and 2476 * transaction when it is started and is used to keep
2204 * track of whether a transaction is 2477 * track of whether a transaction is already in progress.
2205 */ 2478 */
2206 file->private_data = NULL; 2479 file->private_data = NULL;
2207 return 0; 2480 return 0;
2208 } 2481 }
2209 2482
2210 /* 2483 /*
2211 * Used by /dev/btrfs-control for devices ioc 2484 * Used by /dev/btrfs-control for devices ioctls.
2212 */ 2485 */
2213 static long btrfs_control_ioctl(struct file * 2486 static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
2214 unsigned long 2487 unsigned long arg)
2215 { 2488 {
2216 struct btrfs_ioctl_vol_args *vol; 2489 struct btrfs_ioctl_vol_args *vol;
2217 struct btrfs_device *device = NULL; 2490 struct btrfs_device *device = NULL;
2218 dev_t devt = 0; 2491 dev_t devt = 0;
2219 int ret = -ENOTTY; 2492 int ret = -ENOTTY;
2220 2493
2221 if (!capable(CAP_SYS_ADMIN)) 2494 if (!capable(CAP_SYS_ADMIN))
2222 return -EPERM; 2495 return -EPERM;
2223 2496
2224 vol = memdup_user((void __user *)arg, 2497 vol = memdup_user((void __user *)arg, sizeof(*vol));
2225 if (IS_ERR(vol)) 2498 if (IS_ERR(vol))
2226 return PTR_ERR(vol); 2499 return PTR_ERR(vol);
2227 ret = btrfs_check_ioctl_vol_args_path !! 2500 vol->name[BTRFS_PATH_NAME_MAX] = '\0';
2228 if (ret < 0) <<
2229 goto out; <<
2230 2501
2231 switch (cmd) { 2502 switch (cmd) {
2232 case BTRFS_IOC_SCAN_DEV: 2503 case BTRFS_IOC_SCAN_DEV:
2233 mutex_lock(&uuid_mutex); 2504 mutex_lock(&uuid_mutex);
2234 /* !! 2505 device = btrfs_scan_one_device(vol->name, FMODE_READ,
2235 * Scanning outside of mount !! 2506 &btrfs_root_fs_type);
2236 * into 0 error code. <<
2237 */ <<
2238 device = btrfs_scan_one_devic <<
2239 ret = PTR_ERR_OR_ZERO(device) 2507 ret = PTR_ERR_OR_ZERO(device);
2240 mutex_unlock(&uuid_mutex); 2508 mutex_unlock(&uuid_mutex);
2241 break; 2509 break;
2242 case BTRFS_IOC_FORGET_DEV: 2510 case BTRFS_IOC_FORGET_DEV:
2243 if (vol->name[0] != 0) { 2511 if (vol->name[0] != 0) {
2244 ret = lookup_bdev(vol 2512 ret = lookup_bdev(vol->name, &devt);
2245 if (ret) 2513 if (ret)
2246 break; 2514 break;
2247 } 2515 }
2248 ret = btrfs_forget_devices(de 2516 ret = btrfs_forget_devices(devt);
2249 break; 2517 break;
2250 case BTRFS_IOC_DEVICES_READY: 2518 case BTRFS_IOC_DEVICES_READY:
2251 mutex_lock(&uuid_mutex); 2519 mutex_lock(&uuid_mutex);
2252 /* !! 2520 device = btrfs_scan_one_device(vol->name, FMODE_READ,
2253 * Scanning outside of mount !! 2521 &btrfs_root_fs_type);
2254 * into 0 error code. !! 2522 if (IS_ERR(device)) {
2255 */ <<
2256 device = btrfs_scan_one_devic <<
2257 if (IS_ERR_OR_NULL(device)) { <<
2258 mutex_unlock(&uuid_mu 2523 mutex_unlock(&uuid_mutex);
2259 ret = PTR_ERR(device) 2524 ret = PTR_ERR(device);
2260 break; 2525 break;
2261 } 2526 }
2262 ret = !(device->fs_devices->n 2527 ret = !(device->fs_devices->num_devices ==
2263 device->fs_devices->t 2528 device->fs_devices->total_devices);
2264 mutex_unlock(&uuid_mutex); 2529 mutex_unlock(&uuid_mutex);
2265 break; 2530 break;
2266 case BTRFS_IOC_GET_SUPPORTED_FEATURES 2531 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
2267 ret = btrfs_ioctl_get_support 2532 ret = btrfs_ioctl_get_supported_features((void __user*)arg);
2268 break; 2533 break;
2269 } 2534 }
2270 2535
2271 out: <<
2272 kfree(vol); 2536 kfree(vol);
2273 return ret; 2537 return ret;
2274 } 2538 }
2275 2539
2276 static int btrfs_freeze(struct super_block *s 2540 static int btrfs_freeze(struct super_block *sb)
2277 { 2541 {
>> 2542 struct btrfs_trans_handle *trans;
2278 struct btrfs_fs_info *fs_info = btrfs 2543 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
>> 2544 struct btrfs_root *root = fs_info->tree_root;
2279 2545
2280 set_bit(BTRFS_FS_FROZEN, &fs_info->fl 2546 set_bit(BTRFS_FS_FROZEN, &fs_info->flags);
2281 /* 2547 /*
2282 * We don't need a barrier here, we'l 2548 * We don't need a barrier here, we'll wait for any transaction that
2283 * could be in progress on other thre 2549 * could be in progress on other threads (and do delayed iputs that
2284 * we want to avoid on a frozen files 2550 * we want to avoid on a frozen filesystem), or do the commit
2285 * ourselves. 2551 * ourselves.
2286 */ 2552 */
2287 return btrfs_commit_current_transacti !! 2553 trans = btrfs_attach_transaction_barrier(root);
2288 } !! 2554 if (IS_ERR(trans)) {
2289 !! 2555 /* no transaction, don't bother */
2290 static int check_dev_super(struct btrfs_devic !! 2556 if (PTR_ERR(trans) == -ENOENT)
2291 { !! 2557 return 0;
2292 struct btrfs_fs_info *fs_info = dev-> !! 2558 return PTR_ERR(trans);
2293 struct btrfs_super_block *sb; <<
2294 u64 last_trans; <<
2295 u16 csum_type; <<
2296 int ret = 0; <<
2297 <<
2298 /* This should be called with fs stil <<
2299 ASSERT(test_bit(BTRFS_FS_FROZEN, &fs_ <<
2300 <<
2301 /* Missing dev, no need to check. */ <<
2302 if (!dev->bdev) <<
2303 return 0; <<
2304 <<
2305 /* Only need to check the primary sup <<
2306 sb = btrfs_read_dev_one_super(dev->bd <<
2307 if (IS_ERR(sb)) <<
2308 return PTR_ERR(sb); <<
2309 <<
2310 /* Verify the checksum. */ <<
2311 csum_type = btrfs_super_csum_type(sb) <<
2312 if (csum_type != btrfs_super_csum_typ <<
2313 btrfs_err(fs_info, "csum type <<
2314 csum_type, btrfs_su <<
2315 ret = -EUCLEAN; <<
2316 goto out; <<
2317 } <<
2318 <<
2319 if (btrfs_check_super_csum(fs_info, s <<
2320 btrfs_err(fs_info, "csum for <<
2321 ret = -EUCLEAN; <<
2322 goto out; <<
2323 } <<
2324 <<
2325 /* Btrfs_validate_super() includes fs <<
2326 ret = btrfs_validate_super(fs_info, s <<
2327 if (ret < 0) <<
2328 goto out; <<
2329 <<
2330 last_trans = btrfs_get_last_trans_com <<
2331 if (btrfs_super_generation(sb) != las <<
2332 btrfs_err(fs_info, "transid m <<
2333 btrfs_super_generat <<
2334 ret = -EUCLEAN; <<
2335 goto out; <<
2336 } 2559 }
2337 out: !! 2560 return btrfs_commit_transaction(trans);
2338 btrfs_release_disk_super(sb); <<
2339 return ret; <<
2340 } 2561 }
2341 2562
2342 static int btrfs_unfreeze(struct super_block 2563 static int btrfs_unfreeze(struct super_block *sb)
2343 { 2564 {
2344 struct btrfs_fs_info *fs_info = btrfs 2565 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2345 struct btrfs_device *device; <<
2346 int ret = 0; <<
2347 2566
2348 /* <<
2349 * Make sure the fs is not changed by <<
2350 * modified by other OS). <<
2351 * If we found anything wrong, we mar <<
2352 * <<
2353 * And since the fs is frozen, no one <<
2354 * we don't need to hold device_list_ <<
2355 */ <<
2356 list_for_each_entry(device, &fs_info- <<
2357 ret = check_dev_super(device) <<
2358 if (ret < 0) { <<
2359 btrfs_handle_fs_error <<
2360 "super block <<
2361 device->devid <<
2362 break; <<
2363 } <<
2364 } <<
2365 clear_bit(BTRFS_FS_FROZEN, &fs_info-> 2567 clear_bit(BTRFS_FS_FROZEN, &fs_info->flags);
2366 <<
2367 /* <<
2368 * We still return 0, to allow VFS la <<
2369 * above checks failed. Since the fs <<
2370 * safe to continue, without causing <<
2371 */ <<
2372 return 0; 2568 return 0;
2373 } 2569 }
2374 2570
2375 static int btrfs_show_devname(struct seq_file 2571 static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
2376 { 2572 {
2377 struct btrfs_fs_info *fs_info = btrfs 2573 struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
2378 2574
2379 /* 2575 /*
2380 * There should be always a valid poi 2576 * There should be always a valid pointer in latest_dev, it may be stale
2381 * for a short moment in case it's be 2577 * for a short moment in case it's being deleted but still valid until
2382 * the end of RCU grace period. 2578 * the end of RCU grace period.
2383 */ 2579 */
2384 rcu_read_lock(); 2580 rcu_read_lock();
2385 seq_escape(m, btrfs_dev_name(fs_info- !! 2581 seq_escape(m, rcu_str_deref(fs_info->fs_devices->latest_dev->name), " \t\n\\");
2386 rcu_read_unlock(); 2582 rcu_read_unlock();
2387 2583
2388 return 0; 2584 return 0;
2389 } 2585 }
2390 2586
2391 static long btrfs_nr_cached_objects(struct su <<
2392 { <<
2393 struct btrfs_fs_info *fs_info = btrfs <<
2394 const s64 nr = percpu_counter_sum_pos <<
2395 <<
2396 trace_btrfs_extent_map_shrinker_count <<
2397 <<
2398 /* <<
2399 * Only report the real number for DE <<
2400 * serious performance degradation ca <<
2401 */ <<
2402 if (IS_ENABLED(CONFIG_BTRFS_DEBUG)) <<
2403 return nr; <<
2404 return 0; <<
2405 } <<
2406 <<
2407 static long btrfs_free_cached_objects(struct <<
2408 { <<
2409 const long nr_to_scan = min_t(unsigne <<
2410 struct btrfs_fs_info *fs_info = btrfs <<
2411 <<
2412 /* <<
2413 * We may be called from any task try <<
2414 * want to slow it down with scanning <<
2415 * also cause heavy lock contention i <<
2416 * here. Therefore only allow kswapd <<
2417 */ <<
2418 if (!current_is_kswapd()) <<
2419 return 0; <<
2420 <<
2421 return btrfs_free_extent_maps(fs_info <<
2422 } <<
2423 <<
2424 static const struct super_operations btrfs_su 2587 static const struct super_operations btrfs_super_ops = {
2425 .drop_inode = btrfs_drop_inode, 2588 .drop_inode = btrfs_drop_inode,
2426 .evict_inode = btrfs_evict_inode, 2589 .evict_inode = btrfs_evict_inode,
2427 .put_super = btrfs_put_super, 2590 .put_super = btrfs_put_super,
2428 .sync_fs = btrfs_sync_fs, 2591 .sync_fs = btrfs_sync_fs,
2429 .show_options = btrfs_show_options, 2592 .show_options = btrfs_show_options,
2430 .show_devname = btrfs_show_devname, 2593 .show_devname = btrfs_show_devname,
2431 .alloc_inode = btrfs_alloc_inode, 2594 .alloc_inode = btrfs_alloc_inode,
2432 .destroy_inode = btrfs_destroy_inode 2595 .destroy_inode = btrfs_destroy_inode,
2433 .free_inode = btrfs_free_inode, 2596 .free_inode = btrfs_free_inode,
2434 .statfs = btrfs_statfs, 2597 .statfs = btrfs_statfs,
>> 2598 .remount_fs = btrfs_remount,
2435 .freeze_fs = btrfs_freeze, 2599 .freeze_fs = btrfs_freeze,
2436 .unfreeze_fs = btrfs_unfreeze, 2600 .unfreeze_fs = btrfs_unfreeze,
2437 .nr_cached_objects = btrfs_nr_cached_ <<
2438 .free_cached_objects = btrfs_free_cac <<
2439 }; 2601 };
2440 2602
2441 static const struct file_operations btrfs_ctl 2603 static const struct file_operations btrfs_ctl_fops = {
2442 .open = btrfs_control_open, 2604 .open = btrfs_control_open,
2443 .unlocked_ioctl = btrfs_control_ioct 2605 .unlocked_ioctl = btrfs_control_ioctl,
2444 .compat_ioctl = compat_ptr_ioctl, 2606 .compat_ioctl = compat_ptr_ioctl,
2445 .owner = THIS_MODULE, 2607 .owner = THIS_MODULE,
2446 .llseek = noop_llseek, 2608 .llseek = noop_llseek,
2447 }; 2609 };
2448 2610
2449 static struct miscdevice btrfs_misc = { 2611 static struct miscdevice btrfs_misc = {
2450 .minor = BTRFS_MINOR, 2612 .minor = BTRFS_MINOR,
2451 .name = "btrfs-control", 2613 .name = "btrfs-control",
2452 .fops = &btrfs_ctl_fops 2614 .fops = &btrfs_ctl_fops
2453 }; 2615 };
2454 2616
2455 MODULE_ALIAS_MISCDEV(BTRFS_MINOR); 2617 MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
2456 MODULE_ALIAS("devname:btrfs-control"); 2618 MODULE_ALIAS("devname:btrfs-control");
2457 2619
2458 static int __init btrfs_interface_init(void) 2620 static int __init btrfs_interface_init(void)
2459 { 2621 {
2460 return misc_register(&btrfs_misc); 2622 return misc_register(&btrfs_misc);
2461 } 2623 }
2462 2624
2463 static __cold void btrfs_interface_exit(void) 2625 static __cold void btrfs_interface_exit(void)
2464 { 2626 {
2465 misc_deregister(&btrfs_misc); 2627 misc_deregister(&btrfs_misc);
2466 } 2628 }
2467 2629
2468 static int __init btrfs_print_mod_info(void) !! 2630 static void __init btrfs_print_mod_info(void)
2469 { 2631 {
2470 static const char options[] = "" 2632 static const char options[] = ""
2471 #ifdef CONFIG_BTRFS_DEBUG 2633 #ifdef CONFIG_BTRFS_DEBUG
2472 ", debug=on" 2634 ", debug=on"
2473 #endif 2635 #endif
2474 #ifdef CONFIG_BTRFS_ASSERT 2636 #ifdef CONFIG_BTRFS_ASSERT
2475 ", assert=on" 2637 ", assert=on"
2476 #endif 2638 #endif
>> 2639 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
>> 2640 ", integrity-checker=on"
>> 2641 #endif
2477 #ifdef CONFIG_BTRFS_FS_REF_VERIFY 2642 #ifdef CONFIG_BTRFS_FS_REF_VERIFY
2478 ", ref-verify=on" 2643 ", ref-verify=on"
2479 #endif 2644 #endif
2480 #ifdef CONFIG_BLK_DEV_ZONED 2645 #ifdef CONFIG_BLK_DEV_ZONED
2481 ", zoned=yes" 2646 ", zoned=yes"
2482 #else 2647 #else
2483 ", zoned=no" 2648 ", zoned=no"
2484 #endif 2649 #endif
2485 #ifdef CONFIG_FS_VERITY 2650 #ifdef CONFIG_FS_VERITY
2486 ", fsverity=yes" 2651 ", fsverity=yes"
2487 #else 2652 #else
2488 ", fsverity=no" 2653 ", fsverity=no"
2489 #endif 2654 #endif
2490 ; 2655 ;
2491 pr_info("Btrfs loaded%s\n", options); !! 2656 pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options);
2492 return 0; <<
2493 } 2657 }
2494 2658
2495 static int register_btrfs(void) !! 2659 static int __init init_btrfs_fs(void)
2496 { 2660 {
2497 return register_filesystem(&btrfs_fs_ !! 2661 int err;
2498 } <<
2499 2662
2500 static void unregister_btrfs(void) !! 2663 btrfs_props_init();
2501 { <<
2502 unregister_filesystem(&btrfs_fs_type) <<
2503 } <<
2504 2664
2505 /* Helper structure for long init/exit functi !! 2665 err = btrfs_init_sysfs();
2506 struct init_sequence { !! 2666 if (err)
2507 int (*init_func)(void); !! 2667 return err;
2508 /* Can be NULL if the init_func doesn <<
2509 void (*exit_func)(void); <<
2510 }; <<
2511 2668
2512 static const struct init_sequence mod_init_se !! 2669 btrfs_init_compress();
2513 { <<
2514 .init_func = btrfs_props_init <<
2515 .exit_func = NULL, <<
2516 }, { <<
2517 .init_func = btrfs_init_sysfs <<
2518 .exit_func = btrfs_exit_sysfs <<
2519 }, { <<
2520 .init_func = btrfs_init_compr <<
2521 .exit_func = btrfs_exit_compr <<
2522 }, { <<
2523 .init_func = btrfs_init_cache <<
2524 .exit_func = btrfs_destroy_ca <<
2525 }, { <<
2526 .init_func = btrfs_init_dio, <<
2527 .exit_func = btrfs_destroy_di <<
2528 }, { <<
2529 .init_func = btrfs_transactio <<
2530 .exit_func = btrfs_transactio <<
2531 }, { <<
2532 .init_func = btrfs_ctree_init <<
2533 .exit_func = btrfs_ctree_exit <<
2534 }, { <<
2535 .init_func = btrfs_free_space <<
2536 .exit_func = btrfs_free_space <<
2537 }, { <<
2538 .init_func = extent_state_ini <<
2539 .exit_func = extent_state_fre <<
2540 }, { <<
2541 .init_func = extent_buffer_in <<
2542 .exit_func = extent_buffer_fr <<
2543 }, { <<
2544 .init_func = btrfs_bioset_ini <<
2545 .exit_func = btrfs_bioset_exi <<
2546 }, { <<
2547 .init_func = extent_map_init, <<
2548 .exit_func = extent_map_exit, <<
2549 }, { <<
2550 .init_func = ordered_data_ini <<
2551 .exit_func = ordered_data_exi <<
2552 }, { <<
2553 .init_func = btrfs_delayed_in <<
2554 .exit_func = btrfs_delayed_in <<
2555 }, { <<
2556 .init_func = btrfs_auto_defra <<
2557 .exit_func = btrfs_auto_defra <<
2558 }, { <<
2559 .init_func = btrfs_delayed_re <<
2560 .exit_func = btrfs_delayed_re <<
2561 }, { <<
2562 .init_func = btrfs_prelim_ref <<
2563 .exit_func = btrfs_prelim_ref <<
2564 }, { <<
2565 .init_func = btrfs_interface_ <<
2566 .exit_func = btrfs_interface_ <<
2567 }, { <<
2568 .init_func = btrfs_print_mod_ <<
2569 .exit_func = NULL, <<
2570 }, { <<
2571 .init_func = btrfs_run_sanity <<
2572 .exit_func = NULL, <<
2573 }, { <<
2574 .init_func = register_btrfs, <<
2575 .exit_func = unregister_btrfs <<
2576 } <<
2577 }; <<
2578 2670
2579 static bool mod_init_result[ARRAY_SIZE(mod_in !! 2671 err = btrfs_init_cachep();
>> 2672 if (err)
>> 2673 goto free_compress;
2580 2674
2581 static __always_inline void btrfs_exit_btrfs_ !! 2675 err = extent_io_init();
2582 { !! 2676 if (err)
2583 int i; !! 2677 goto free_cachep;
2584 2678
2585 for (i = ARRAY_SIZE(mod_init_seq) - 1 !! 2679 err = extent_state_cache_init();
2586 if (!mod_init_result[i]) !! 2680 if (err)
2587 continue; !! 2681 goto free_extent_io;
2588 if (mod_init_seq[i].exit_func !! 2682
2589 mod_init_seq[i].exit_ !! 2683 err = extent_map_init();
2590 mod_init_result[i] = false; !! 2684 if (err)
2591 } !! 2685 goto free_extent_state_cache;
>> 2686
>> 2687 err = ordered_data_init();
>> 2688 if (err)
>> 2689 goto free_extent_map;
>> 2690
>> 2691 err = btrfs_delayed_inode_init();
>> 2692 if (err)
>> 2693 goto free_ordered_data;
>> 2694
>> 2695 err = btrfs_auto_defrag_init();
>> 2696 if (err)
>> 2697 goto free_delayed_inode;
>> 2698
>> 2699 err = btrfs_delayed_ref_init();
>> 2700 if (err)
>> 2701 goto free_auto_defrag;
>> 2702
>> 2703 err = btrfs_prelim_ref_init();
>> 2704 if (err)
>> 2705 goto free_delayed_ref;
>> 2706
>> 2707 err = btrfs_end_io_wq_init();
>> 2708 if (err)
>> 2709 goto free_prelim_ref;
>> 2710
>> 2711 err = btrfs_interface_init();
>> 2712 if (err)
>> 2713 goto free_end_io_wq;
>> 2714
>> 2715 btrfs_print_mod_info();
>> 2716
>> 2717 err = btrfs_run_sanity_tests();
>> 2718 if (err)
>> 2719 goto unregister_ioctl;
>> 2720
>> 2721 err = register_filesystem(&btrfs_fs_type);
>> 2722 if (err)
>> 2723 goto unregister_ioctl;
>> 2724
>> 2725 return 0;
>> 2726
>> 2727 unregister_ioctl:
>> 2728 btrfs_interface_exit();
>> 2729 free_end_io_wq:
>> 2730 btrfs_end_io_wq_exit();
>> 2731 free_prelim_ref:
>> 2732 btrfs_prelim_ref_exit();
>> 2733 free_delayed_ref:
>> 2734 btrfs_delayed_ref_exit();
>> 2735 free_auto_defrag:
>> 2736 btrfs_auto_defrag_exit();
>> 2737 free_delayed_inode:
>> 2738 btrfs_delayed_inode_exit();
>> 2739 free_ordered_data:
>> 2740 ordered_data_exit();
>> 2741 free_extent_map:
>> 2742 extent_map_exit();
>> 2743 free_extent_state_cache:
>> 2744 extent_state_cache_exit();
>> 2745 free_extent_io:
>> 2746 extent_io_exit();
>> 2747 free_cachep:
>> 2748 btrfs_destroy_cachep();
>> 2749 free_compress:
>> 2750 btrfs_exit_compress();
>> 2751 btrfs_exit_sysfs();
>> 2752
>> 2753 return err;
2592 } 2754 }
2593 2755
2594 static void __exit exit_btrfs_fs(void) 2756 static void __exit exit_btrfs_fs(void)
2595 { 2757 {
2596 btrfs_exit_btrfs_fs(); !! 2758 btrfs_destroy_cachep();
>> 2759 btrfs_delayed_ref_exit();
>> 2760 btrfs_auto_defrag_exit();
>> 2761 btrfs_delayed_inode_exit();
>> 2762 btrfs_prelim_ref_exit();
>> 2763 ordered_data_exit();
>> 2764 extent_map_exit();
>> 2765 extent_state_cache_exit();
>> 2766 extent_io_exit();
>> 2767 btrfs_interface_exit();
>> 2768 btrfs_end_io_wq_exit();
>> 2769 unregister_filesystem(&btrfs_fs_type);
>> 2770 btrfs_exit_sysfs();
2597 btrfs_cleanup_fs_uuids(); 2771 btrfs_cleanup_fs_uuids();
2598 } !! 2772 btrfs_exit_compress();
2599 <<
2600 static int __init init_btrfs_fs(void) <<
2601 { <<
2602 int ret; <<
2603 int i; <<
2604 <<
2605 for (i = 0; i < ARRAY_SIZE(mod_init_s <<
2606 ASSERT(!mod_init_result[i]); <<
2607 ret = mod_init_seq[i].init_fu <<
2608 if (ret < 0) { <<
2609 btrfs_exit_btrfs_fs() <<
2610 return ret; <<
2611 } <<
2612 mod_init_result[i] = true; <<
2613 } <<
2614 return 0; <<
2615 } 2773 }
2616 2774
2617 late_initcall(init_btrfs_fs); 2775 late_initcall(init_btrfs_fs);
2618 module_exit(exit_btrfs_fs) 2776 module_exit(exit_btrfs_fs)
2619 2777
2620 MODULE_DESCRIPTION("B-Tree File System (BTRFS <<
2621 MODULE_LICENSE("GPL"); 2778 MODULE_LICENSE("GPL");
2622 MODULE_SOFTDEP("pre: crc32c"); 2779 MODULE_SOFTDEP("pre: crc32c");
2623 MODULE_SOFTDEP("pre: xxhash64"); 2780 MODULE_SOFTDEP("pre: xxhash64");
2624 MODULE_SOFTDEP("pre: sha256"); 2781 MODULE_SOFTDEP("pre: sha256");
2625 MODULE_SOFTDEP("pre: blake2b-256"); 2782 MODULE_SOFTDEP("pre: blake2b-256");
2626 2783
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