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