Blame view
fs/super.c
28.5 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
/* * linux/fs/super.c * * Copyright (C) 1991, 1992 Linus Torvalds * * super.c contains code to handle: - mount structures * - super-block tables * - filesystem drivers list * - mount system call * - umount system call * - ustat system call * * GK 2/5/95 - Changed to support mounting the root fs via NFS * * Added kerneld support: Jacques Gelinas and Bjorn Ekwall * Added change_root: Werner Almesberger & Hans Lermen, Feb '96 * Added options to /proc/mounts: |
96de0e252 Convert files to ... |
18 |
* Torbjörn Lindh (torbjorn.lindh@gopta.se), April 14, 1996. |
1da177e4c Linux-2.6.12-rc2 |
19 20 21 |
* Added devfs support: Richard Gooch <rgooch@atnf.csiro.au>, 13-JAN-1998 * Heavily rewritten for 'one fs - one tree' dcache architecture. AV, Mar 2000 */ |
1da177e4c Linux-2.6.12-rc2 |
22 23 |
#include <linux/module.h> #include <linux/slab.h> |
1da177e4c Linux-2.6.12-rc2 |
24 25 |
#include <linux/acct.h> #include <linux/blkdev.h> |
1da177e4c Linux-2.6.12-rc2 |
26 27 |
#include <linux/mount.h> #include <linux/security.h> |
1da177e4c Linux-2.6.12-rc2 |
28 29 |
#include <linux/writeback.h> /* for the emergency remount stuff */ #include <linux/idr.h> |
353ab6e97 [PATCH] sem2mutex... |
30 |
#include <linux/mutex.h> |
5477d0fac fs: fs/super.c ne... |
31 |
#include <linux/backing-dev.h> |
ceb5bdc2d fs: dcache per-bu... |
32 |
#include <linux/rculist_bl.h> |
c515e1fd3 mm/fs: add hooks ... |
33 |
#include <linux/cleancache.h> |
6d59e7f58 [PATCH] move a bu... |
34 |
#include "internal.h" |
1da177e4c Linux-2.6.12-rc2 |
35 |
|
1da177e4c Linux-2.6.12-rc2 |
36 37 |
LIST_HEAD(super_blocks); DEFINE_SPINLOCK(sb_lock); |
b0d40c92a superblock: intro... |
38 39 40 41 42 43 44 45 46 47 |
/* * One thing we have to be careful of with a per-sb shrinker is that we don't * drop the last active reference to the superblock from within the shrinker. * If that happens we could trigger unregistering the shrinker from within the * shrinker path and that leads to deadlock on the shrinker_rwsem. Hence we * take a passive reference to the superblock to avoid this from occurring. */ static int prune_super(struct shrinker *shrink, struct shrink_control *sc) { struct super_block *sb; |
0e1fdafd9 superblock: add f... |
48 49 |
int fs_objects = 0; int total_objects; |
b0d40c92a superblock: intro... |
50 51 52 53 54 55 56 57 58 59 60 |
sb = container_of(shrink, struct super_block, s_shrink); /* * Deadlock avoidance. We may hold various FS locks, and we don't want * to recurse into the FS that called us in clear_inode() and friends.. */ if (sc->nr_to_scan && !(sc->gfp_mask & __GFP_FS)) return -1; if (!grab_super_passive(sb)) |
09f363c73 vmscan: fix shrin... |
61 |
return !sc->nr_to_scan ? 0 : -1; |
b0d40c92a superblock: intro... |
62 |
|
0e1fdafd9 superblock: add f... |
63 64 65 66 67 |
if (sb->s_op && sb->s_op->nr_cached_objects) fs_objects = sb->s_op->nr_cached_objects(sb); total_objects = sb->s_nr_dentry_unused + sb->s_nr_inodes_unused + fs_objects + 1; |
b0d40c92a superblock: intro... |
68 |
if (sc->nr_to_scan) { |
0e1fdafd9 superblock: add f... |
69 70 |
int dentries; int inodes; |
b0d40c92a superblock: intro... |
71 |
|
0e1fdafd9 superblock: add f... |
72 73 74 75 76 77 78 79 80 81 82 83 84 85 |
/* proportion the scan between the caches */ dentries = (sc->nr_to_scan * sb->s_nr_dentry_unused) / total_objects; inodes = (sc->nr_to_scan * sb->s_nr_inodes_unused) / total_objects; if (fs_objects) fs_objects = (sc->nr_to_scan * fs_objects) / total_objects; /* * prune the dcache first as the icache is pinned by it, then * prune the icache, followed by the filesystem specific caches */ prune_dcache_sb(sb, dentries); prune_icache_sb(sb, inodes); |
b0d40c92a superblock: intro... |
86 |
|
0e1fdafd9 superblock: add f... |
87 88 89 90 91 92 |
if (fs_objects && sb->s_op->free_cached_objects) { sb->s_op->free_cached_objects(sb, fs_objects); fs_objects = sb->s_op->nr_cached_objects(sb); } total_objects = sb->s_nr_dentry_unused + sb->s_nr_inodes_unused + fs_objects; |
b0d40c92a superblock: intro... |
93 |
} |
0e1fdafd9 superblock: add f... |
94 |
total_objects = (total_objects / 100) * sysctl_vfs_cache_pressure; |
b0d40c92a superblock: intro... |
95 |
drop_super(sb); |
0e1fdafd9 superblock: add f... |
96 |
return total_objects; |
b0d40c92a superblock: intro... |
97 |
} |
1da177e4c Linux-2.6.12-rc2 |
98 99 |
/** * alloc_super - create new superblock |
fe2bbc483 [PATCH] add missi... |
100 |
* @type: filesystem type superblock should belong to |
1da177e4c Linux-2.6.12-rc2 |
101 102 103 104 |
* * Allocates and initializes a new &struct super_block. alloc_super() * returns a pointer new superblock or %NULL if allocation had failed. */ |
cf5162499 [PATCH] lockdep: ... |
105 |
static struct super_block *alloc_super(struct file_system_type *type) |
1da177e4c Linux-2.6.12-rc2 |
106 |
{ |
11b0b5abb [PATCH] use kzall... |
107 |
struct super_block *s = kzalloc(sizeof(struct super_block), GFP_USER); |
b87221de6 const: mark remai... |
108 |
static const struct super_operations default_op; |
1da177e4c Linux-2.6.12-rc2 |
109 110 |
if (s) { |
1da177e4c Linux-2.6.12-rc2 |
111 112 113 114 115 |
if (security_sb_alloc(s)) { kfree(s); s = NULL; goto out; } |
6416ccb78 fs: scale files_lock |
116 117 118 119 120 121 122 123 124 125 126 127 128 129 |
#ifdef CONFIG_SMP s->s_files = alloc_percpu(struct list_head); if (!s->s_files) { security_sb_free(s); kfree(s); s = NULL; goto out; } else { int i; for_each_possible_cpu(i) INIT_LIST_HEAD(per_cpu_ptr(s->s_files, i)); } #else |
1da177e4c Linux-2.6.12-rc2 |
130 |
INIT_LIST_HEAD(&s->s_files); |
6416ccb78 fs: scale files_lock |
131 |
#endif |
95f28604a fs: assign sb->s_... |
132 |
s->s_bdi = &default_backing_dev_info; |
1da177e4c Linux-2.6.12-rc2 |
133 |
INIT_LIST_HEAD(&s->s_instances); |
ceb5bdc2d fs: dcache per-bu... |
134 |
INIT_HLIST_BL_HEAD(&s->s_anon); |
1da177e4c Linux-2.6.12-rc2 |
135 |
INIT_LIST_HEAD(&s->s_inodes); |
da3bbdd46 fix soft lock up ... |
136 |
INIT_LIST_HEAD(&s->s_dentry_lru); |
98b745c64 inode: Make unuse... |
137 |
INIT_LIST_HEAD(&s->s_inode_lru); |
09cc9fc7a inode: move to pe... |
138 |
spin_lock_init(&s->s_inode_lru_lock); |
1da177e4c Linux-2.6.12-rc2 |
139 |
init_rwsem(&s->s_umount); |
7892f2f48 [PATCH] mutex sub... |
140 |
mutex_init(&s->s_lock); |
897c6ff95 [PATCH] lockdep: ... |
141 |
lockdep_set_class(&s->s_umount, &type->s_umount_key); |
cf5162499 [PATCH] lockdep: ... |
142 143 144 145 146 147 |
/* * The locking rules for s_lock are up to the * filesystem. For example ext3fs has different * lock ordering than usbfs: */ lockdep_set_class(&s->s_lock, &type->s_lock_key); |
ada723dcd fs/super.c: add l... |
148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 |
/* * sget() can have s_umount recursion. * * When it cannot find a suitable sb, it allocates a new * one (this one), and tries again to find a suitable old * one. * * In case that succeeds, it will acquire the s_umount * lock of the old one. Since these are clearly distrinct * locks, and this object isn't exposed yet, there's no * risk of deadlocks. * * Annotate this by putting this lock in a different * subclass. */ down_write_nested(&s->s_umount, SINGLE_DEPTH_NESTING); |
b20bd1a5e get rid of S_BIAS |
164 |
s->s_count = 1; |
1da177e4c Linux-2.6.12-rc2 |
165 |
atomic_set(&s->s_active, 1); |
a11f3a057 [PATCH] sem2mutex... |
166 |
mutex_init(&s->s_vfs_rename_mutex); |
51ee049e7 vfs: add lockdep ... |
167 |
lockdep_set_class(&s->s_vfs_rename_mutex, &type->s_vfs_rename_key); |
d3be915fc [PATCH] sem2mutex... |
168 169 |
mutex_init(&s->s_dquot.dqio_mutex); mutex_init(&s->s_dquot.dqonoff_mutex); |
1da177e4c Linux-2.6.12-rc2 |
170 171 172 |
init_rwsem(&s->s_dquot.dqptr_sem); init_waitqueue_head(&s->s_wait_unfrozen); s->s_maxbytes = MAX_NON_LFS; |
1da177e4c Linux-2.6.12-rc2 |
173 174 |
s->s_op = &default_op; s->s_time_gran = 1000000000; |
c515e1fd3 mm/fs: add hooks ... |
175 |
s->cleancache_poolid = -1; |
b0d40c92a superblock: intro... |
176 177 178 |
s->s_shrink.seeks = DEFAULT_SEEKS; s->s_shrink.shrink = prune_super; |
8ab47664d vfs: increase shr... |
179 |
s->s_shrink.batch = 1024; |
1da177e4c Linux-2.6.12-rc2 |
180 181 182 183 184 185 186 187 188 189 190 191 192 |
} out: return s; } /** * destroy_super - frees a superblock * @s: superblock to free * * Frees a superblock. */ static inline void destroy_super(struct super_block *s) { |
6416ccb78 fs: scale files_lock |
193 194 195 |
#ifdef CONFIG_SMP free_percpu(s->s_files); #endif |
1da177e4c Linux-2.6.12-rc2 |
196 |
security_sb_free(s); |
79c0b2df7 add filesystem su... |
197 |
kfree(s->s_subtype); |
b3b304a23 mount options: ad... |
198 |
kfree(s->s_options); |
1da177e4c Linux-2.6.12-rc2 |
199 200 201 202 203 204 |
kfree(s); } /* Superblock refcounting */ /* |
35cf7ba0b Bury __put_super_... |
205 |
* Drop a superblock's refcount. The caller must hold sb_lock. |
1da177e4c Linux-2.6.12-rc2 |
206 |
*/ |
35cf7ba0b Bury __put_super_... |
207 |
void __put_super(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
208 |
{ |
1da177e4c Linux-2.6.12-rc2 |
209 |
if (!--sb->s_count) { |
551de6f34 Leave superblocks... |
210 |
list_del_init(&sb->s_list); |
1da177e4c Linux-2.6.12-rc2 |
211 |
destroy_super(sb); |
1da177e4c Linux-2.6.12-rc2 |
212 |
} |
1da177e4c Linux-2.6.12-rc2 |
213 214 215 216 217 218 219 220 221 |
} /** * put_super - drop a temporary reference to superblock * @sb: superblock in question * * Drops a temporary reference, frees superblock if there's no * references left. */ |
03ba3782e writeback: switch... |
222 |
void put_super(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
223 224 225 226 227 228 229 230 |
{ spin_lock(&sb_lock); __put_super(sb); spin_unlock(&sb_lock); } /** |
1712ac8fd Saner locking aro... |
231 |
* deactivate_locked_super - drop an active reference to superblock |
1da177e4c Linux-2.6.12-rc2 |
232 233 |
* @s: superblock to deactivate * |
1712ac8fd Saner locking aro... |
234 235 |
* Drops an active reference to superblock, converting it into a temprory * one if there is no other active references left. In that case we |
1da177e4c Linux-2.6.12-rc2 |
236 237 |
* tell fs driver to shut it down and drop the temporary reference we * had just acquired. |
1712ac8fd Saner locking aro... |
238 239 |
* * Caller holds exclusive lock on superblock; that lock is released. |
1da177e4c Linux-2.6.12-rc2 |
240 |
*/ |
1712ac8fd Saner locking aro... |
241 |
void deactivate_locked_super(struct super_block *s) |
1da177e4c Linux-2.6.12-rc2 |
242 243 |
{ struct file_system_type *fs = s->s_type; |
b20bd1a5e get rid of S_BIAS |
244 |
if (atomic_dec_and_test(&s->s_active)) { |
c515e1fd3 mm/fs: add hooks ... |
245 |
cleancache_flush_fs(s); |
1da177e4c Linux-2.6.12-rc2 |
246 |
fs->kill_sb(s); |
b0d40c92a superblock: intro... |
247 248 249 |
/* caches are now gone, we can safely kill the shrinker now */ unregister_shrinker(&s->s_shrink); |
d863b50ab vfs: call rcu_bar... |
250 251 252 253 254 |
/* * We need to call rcu_barrier so all the delayed rcu free * inodes are flushed before we release the fs module. */ rcu_barrier(); |
1da177e4c Linux-2.6.12-rc2 |
255 256 |
put_filesystem(fs); put_super(s); |
1712ac8fd Saner locking aro... |
257 258 |
} else { up_write(&s->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
259 260 |
} } |
1712ac8fd Saner locking aro... |
261 |
EXPORT_SYMBOL(deactivate_locked_super); |
1da177e4c Linux-2.6.12-rc2 |
262 263 |
/** |
1712ac8fd Saner locking aro... |
264 |
* deactivate_super - drop an active reference to superblock |
74dbbdd7f New helper: deact... |
265 266 |
* @s: superblock to deactivate * |
1712ac8fd Saner locking aro... |
267 268 269 |
* Variant of deactivate_locked_super(), except that superblock is *not* * locked by caller. If we are going to drop the final active reference, * lock will be acquired prior to that. |
74dbbdd7f New helper: deact... |
270 |
*/ |
1712ac8fd Saner locking aro... |
271 |
void deactivate_super(struct super_block *s) |
74dbbdd7f New helper: deact... |
272 |
{ |
1712ac8fd Saner locking aro... |
273 274 275 |
if (!atomic_add_unless(&s->s_active, -1, 1)) { down_write(&s->s_umount); deactivate_locked_super(s); |
74dbbdd7f New helper: deact... |
276 277 |
} } |
1712ac8fd Saner locking aro... |
278 |
EXPORT_SYMBOL(deactivate_super); |
74dbbdd7f New helper: deact... |
279 280 |
/** |
1da177e4c Linux-2.6.12-rc2 |
281 282 283 284 285 286 287 288 289 290 |
* grab_super - acquire an active reference * @s: reference we are trying to make active * * Tries to acquire an active reference. grab_super() is used when we * had just found a superblock in super_blocks or fs_type->fs_supers * and want to turn it into a full-blown active reference. grab_super() * is called with sb_lock held and drops it. Returns 1 in case of * success, 0 if we had failed (superblock contents was already dead or * dying when grab_super() had been called). */ |
9c4dbee79 [PATCH] fs: add l... |
291 |
static int grab_super(struct super_block *s) __releases(sb_lock) |
1da177e4c Linux-2.6.12-rc2 |
292 |
{ |
b20bd1a5e get rid of S_BIAS |
293 294 |
if (atomic_inc_not_zero(&s->s_active)) { spin_unlock(&sb_lock); |
b20bd1a5e get rid of S_BIAS |
295 296 297 |
return 1; } /* it's going away */ |
1da177e4c Linux-2.6.12-rc2 |
298 299 |
s->s_count++; spin_unlock(&sb_lock); |
1712ac8fd Saner locking aro... |
300 |
/* wait for it to die */ |
1da177e4c Linux-2.6.12-rc2 |
301 |
down_write(&s->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
302 303 |
up_write(&s->s_umount); put_super(s); |
1da177e4c Linux-2.6.12-rc2 |
304 305 |
return 0; } |
cf9a2ae8d [PATCH] BLOCK: Mo... |
306 |
/* |
12ad3ab66 superblock: move ... |
307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 |
* grab_super_passive - acquire a passive reference * @s: reference we are trying to grab * * Tries to acquire a passive reference. This is used in places where we * cannot take an active reference but we need to ensure that the * superblock does not go away while we are working on it. It returns * false if a reference was not gained, and returns true with the s_umount * lock held in read mode if a reference is gained. On successful return, * the caller must drop the s_umount lock and the passive reference when * done. */ bool grab_super_passive(struct super_block *sb) { spin_lock(&sb_lock); if (list_empty(&sb->s_instances)) { spin_unlock(&sb_lock); return false; } sb->s_count++; spin_unlock(&sb_lock); if (down_read_trylock(&sb->s_umount)) { if (sb->s_root) return true; up_read(&sb->s_umount); } put_super(sb); return false; } /* |
914e26379 [PATCH] severing ... |
340 341 342 343 |
* Superblock locking. We really ought to get rid of these two. */ void lock_super(struct super_block * sb) { |
914e26379 [PATCH] severing ... |
344 345 346 347 348 |
mutex_lock(&sb->s_lock); } void unlock_super(struct super_block * sb) { |
914e26379 [PATCH] severing ... |
349 350 351 352 353 |
mutex_unlock(&sb->s_lock); } EXPORT_SYMBOL(lock_super); EXPORT_SYMBOL(unlock_super); |
1da177e4c Linux-2.6.12-rc2 |
354 355 356 357 358 359 360 361 362 |
/** * generic_shutdown_super - common helper for ->kill_sb() * @sb: superblock to kill * * generic_shutdown_super() does all fs-independent work on superblock * shutdown. Typical ->kill_sb() should pick all fs-specific objects * that need destruction out of superblock, call generic_shutdown_super() * and release aforementioned objects. Note: dentries and inodes _are_ * taken care of and do not need specific handling. |
c636ebdb1 [PATCH] VFS: Dest... |
363 364 365 366 |
* * Upon calling this function, the filesystem may no longer alter or * rearrange the set of dentries belonging to this super_block, nor may it * change the attachments of dentries to inodes. |
1da177e4c Linux-2.6.12-rc2 |
367 368 369 |
*/ void generic_shutdown_super(struct super_block *sb) { |
ee9b6d61a [PATCH] Mark stru... |
370 |
const struct super_operations *sop = sb->s_op; |
1da177e4c Linux-2.6.12-rc2 |
371 |
|
c636ebdb1 [PATCH] VFS: Dest... |
372 373 |
if (sb->s_root) { shrink_dcache_for_umount(sb); |
60b0680fa vfs: Rename fsync... |
374 |
sync_filesystem(sb); |
1da177e4c Linux-2.6.12-rc2 |
375 |
sb->s_flags &= ~MS_ACTIVE; |
efaee1920 async: make the f... |
376 |
|
63997e98a split invalidate_... |
377 378 379 |
fsnotify_unmount_inodes(&sb->s_inodes); evict_inodes(sb); |
1da177e4c Linux-2.6.12-rc2 |
380 |
|
1da177e4c Linux-2.6.12-rc2 |
381 382 |
if (sop->put_super) sop->put_super(sb); |
63997e98a split invalidate_... |
383 |
if (!list_empty(&sb->s_inodes)) { |
7b4fe29e0 [PATCH] More info... |
384 385 386 387 |
printk("VFS: Busy inodes after unmount of %s. " "Self-destruct in 5 seconds. Have a nice day... ", sb->s_id); |
1da177e4c Linux-2.6.12-rc2 |
388 |
} |
1da177e4c Linux-2.6.12-rc2 |
389 390 391 |
} spin_lock(&sb_lock); /* should be initialized for __put_super_and_need_restart() */ |
551de6f34 Leave superblocks... |
392 |
list_del_init(&sb->s_instances); |
1da177e4c Linux-2.6.12-rc2 |
393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 |
spin_unlock(&sb_lock); up_write(&sb->s_umount); } EXPORT_SYMBOL(generic_shutdown_super); /** * sget - find or create a superblock * @type: filesystem type superblock should belong to * @test: comparison callback * @set: setup callback * @data: argument to each of them */ struct super_block *sget(struct file_system_type *type, int (*test)(struct super_block *,void *), int (*set)(struct super_block *,void *), void *data) { struct super_block *s = NULL; |
d47301271 fs/super.c: use l... |
412 |
struct super_block *old; |
1da177e4c Linux-2.6.12-rc2 |
413 414 415 416 |
int err; retry: spin_lock(&sb_lock); |
d47301271 fs/super.c: use l... |
417 418 419 420 421 422 |
if (test) { list_for_each_entry(old, &type->fs_supers, s_instances) { if (!test(old, data)) continue; if (!grab_super(old)) goto retry; |
a3cfbb53b vfs: add missing ... |
423 424 |
if (s) { up_write(&s->s_umount); |
d47301271 fs/super.c: use l... |
425 |
destroy_super(s); |
7a4dec538 Fix sget() race w... |
426 |
s = NULL; |
a3cfbb53b vfs: add missing ... |
427 |
} |
d3f214730 Move grabbing s_u... |
428 |
down_write(&old->s_umount); |
7a4dec538 Fix sget() race w... |
429 430 431 432 |
if (unlikely(!(old->s_flags & MS_BORN))) { deactivate_locked_super(old); goto retry; } |
d47301271 fs/super.c: use l... |
433 434 |
return old; } |
1da177e4c Linux-2.6.12-rc2 |
435 436 437 |
} if (!s) { spin_unlock(&sb_lock); |
cf5162499 [PATCH] lockdep: ... |
438 |
s = alloc_super(type); |
1da177e4c Linux-2.6.12-rc2 |
439 440 441 442 443 444 445 446 |
if (!s) return ERR_PTR(-ENOMEM); goto retry; } err = set(s, data); if (err) { spin_unlock(&sb_lock); |
a3cfbb53b vfs: add missing ... |
447 |
up_write(&s->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
448 449 450 451 452 453 454 455 456 |
destroy_super(s); return ERR_PTR(err); } s->s_type = type; strlcpy(s->s_id, type->name, sizeof(s->s_id)); list_add_tail(&s->s_list, &super_blocks); list_add(&s->s_instances, &type->fs_supers); spin_unlock(&sb_lock); get_filesystem(type); |
b0d40c92a superblock: intro... |
457 |
register_shrinker(&s->s_shrink); |
1da177e4c Linux-2.6.12-rc2 |
458 459 460 461 462 463 464 465 466 467 468 469 |
return s; } EXPORT_SYMBOL(sget); void drop_super(struct super_block *sb) { up_read(&sb->s_umount); put_super(sb); } EXPORT_SYMBOL(drop_super); |
e50047533 cleanup sync_supers |
470 471 472 473 474 475 476 477 |
/** * sync_supers - helper for periodic superblock writeback * * Call the write_super method if present on all dirty superblocks in * the system. This is for the periodic writeback used by most older * filesystems. For data integrity superblock writeback use * sync_filesystems() instead. * |
1da177e4c Linux-2.6.12-rc2 |
478 479 480 481 482 483 |
* Note: check the dirty flag before waiting, so we don't * hold up the sync while mounting a device. (The newly * mounted device won't need syncing.) */ void sync_supers(void) { |
dca332528 no need for list_... |
484 |
struct super_block *sb, *p = NULL; |
618f06362 [PATCH] O(1) sb l... |
485 |
|
1da177e4c Linux-2.6.12-rc2 |
486 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
487 |
list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
488 489 |
if (list_empty(&sb->s_instances)) continue; |
e50047533 cleanup sync_supers |
490 |
if (sb->s_op->write_super && sb->s_dirt) { |
1da177e4c Linux-2.6.12-rc2 |
491 492 |
sb->s_count++; spin_unlock(&sb_lock); |
e50047533 cleanup sync_supers |
493 |
|
1da177e4c Linux-2.6.12-rc2 |
494 |
down_read(&sb->s_umount); |
e50047533 cleanup sync_supers |
495 496 |
if (sb->s_root && sb->s_dirt) sb->s_op->write_super(sb); |
618f06362 [PATCH] O(1) sb l... |
497 |
up_read(&sb->s_umount); |
e50047533 cleanup sync_supers |
498 |
|
618f06362 [PATCH] O(1) sb l... |
499 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
500 501 502 |
if (p) __put_super(p); p = sb; |
618f06362 [PATCH] O(1) sb l... |
503 504 |
} } |
dca332528 no need for list_... |
505 506 |
if (p) __put_super(p); |
1da177e4c Linux-2.6.12-rc2 |
507 508 |
spin_unlock(&sb_lock); } |
1da177e4c Linux-2.6.12-rc2 |
509 |
/** |
01a05b337 new helper: itera... |
510 511 512 513 514 515 516 517 518 |
* iterate_supers - call function for all active superblocks * @f: function to call * @arg: argument to pass to it * * Scans the superblock list and calls given function, passing it * locked superblock and given argument. */ void iterate_supers(void (*f)(struct super_block *, void *), void *arg) { |
dca332528 no need for list_... |
519 |
struct super_block *sb, *p = NULL; |
01a05b337 new helper: itera... |
520 521 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
522 |
list_for_each_entry(sb, &super_blocks, s_list) { |
01a05b337 new helper: itera... |
523 524 525 526 527 528 529 530 531 532 533 |
if (list_empty(&sb->s_instances)) continue; sb->s_count++; spin_unlock(&sb_lock); down_read(&sb->s_umount); if (sb->s_root) f(sb, arg); up_read(&sb->s_umount); spin_lock(&sb_lock); |
dca332528 no need for list_... |
534 535 536 |
if (p) __put_super(p); p = sb; |
01a05b337 new helper: itera... |
537 |
} |
dca332528 no need for list_... |
538 539 |
if (p) __put_super(p); |
01a05b337 new helper: itera... |
540 541 542 543 |
spin_unlock(&sb_lock); } /** |
43e15cdbe new helper: itera... |
544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 |
* iterate_supers_type - call function for superblocks of given type * @type: fs type * @f: function to call * @arg: argument to pass to it * * Scans the superblock list and calls given function, passing it * locked superblock and given argument. */ void iterate_supers_type(struct file_system_type *type, void (*f)(struct super_block *, void *), void *arg) { struct super_block *sb, *p = NULL; spin_lock(&sb_lock); list_for_each_entry(sb, &type->fs_supers, s_instances) { sb->s_count++; spin_unlock(&sb_lock); down_read(&sb->s_umount); if (sb->s_root) f(sb, arg); up_read(&sb->s_umount); spin_lock(&sb_lock); if (p) __put_super(p); p = sb; } if (p) __put_super(p); spin_unlock(&sb_lock); } EXPORT_SYMBOL(iterate_supers_type); /** |
1da177e4c Linux-2.6.12-rc2 |
580 581 582 583 584 585 |
* get_super - get the superblock of a device * @bdev: device to get the superblock for * * Scans the superblock list and finds the superblock of the file system * mounted on the device given. %NULL is returned if no match is found. */ |
df40c01a9 In get_super() an... |
586 |
struct super_block *get_super(struct block_device *bdev) |
1da177e4c Linux-2.6.12-rc2 |
587 |
{ |
618f06362 [PATCH] O(1) sb l... |
588 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
589 590 |
if (!bdev) return NULL; |
618f06362 [PATCH] O(1) sb l... |
591 |
|
1da177e4c Linux-2.6.12-rc2 |
592 |
spin_lock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
593 594 |
rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
595 596 |
if (list_empty(&sb->s_instances)) continue; |
618f06362 [PATCH] O(1) sb l... |
597 598 |
if (sb->s_bdev == bdev) { sb->s_count++; |
1da177e4c Linux-2.6.12-rc2 |
599 |
spin_unlock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
600 |
down_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
601 |
/* still alive? */ |
618f06362 [PATCH] O(1) sb l... |
602 603 604 |
if (sb->s_root) return sb; up_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
605 |
/* nope, got unmounted */ |
618f06362 [PATCH] O(1) sb l... |
606 |
spin_lock(&sb_lock); |
df40c01a9 In get_super() an... |
607 608 |
__put_super(sb); goto rescan; |
1da177e4c Linux-2.6.12-rc2 |
609 610 611 612 613 614 615 |
} } spin_unlock(&sb_lock); return NULL; } EXPORT_SYMBOL(get_super); |
4504230a7 freeze_bdev: grab... |
616 617 618 619 620 621 622 |
/** * get_active_super - get an active reference to the superblock of a device * @bdev: device to get the superblock for * * Scans the superblock list and finds the superblock of the file system * mounted on the device given. Returns the superblock with an active |
d3f214730 Move grabbing s_u... |
623 |
* reference or %NULL if none was found. |
4504230a7 freeze_bdev: grab... |
624 625 626 627 628 629 630 |
*/ struct super_block *get_active_super(struct block_device *bdev) { struct super_block *sb; if (!bdev) return NULL; |
1494583de fix get_active_su... |
631 |
restart: |
4504230a7 freeze_bdev: grab... |
632 633 |
spin_lock(&sb_lock); list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
634 635 |
if (list_empty(&sb->s_instances)) continue; |
1494583de fix get_active_su... |
636 637 638 639 640 641 |
if (sb->s_bdev == bdev) { if (grab_super(sb)) /* drops sb_lock */ return sb; else goto restart; } |
4504230a7 freeze_bdev: grab... |
642 643 644 645 |
} spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
646 |
|
df40c01a9 In get_super() an... |
647 |
struct super_block *user_get_super(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
648 |
{ |
618f06362 [PATCH] O(1) sb l... |
649 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
650 |
|
1da177e4c Linux-2.6.12-rc2 |
651 |
spin_lock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
652 653 |
rescan: list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
654 655 |
if (list_empty(&sb->s_instances)) continue; |
618f06362 [PATCH] O(1) sb l... |
656 657 |
if (sb->s_dev == dev) { sb->s_count++; |
1da177e4c Linux-2.6.12-rc2 |
658 |
spin_unlock(&sb_lock); |
618f06362 [PATCH] O(1) sb l... |
659 |
down_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
660 |
/* still alive? */ |
618f06362 [PATCH] O(1) sb l... |
661 662 663 |
if (sb->s_root) return sb; up_read(&sb->s_umount); |
df40c01a9 In get_super() an... |
664 |
/* nope, got unmounted */ |
618f06362 [PATCH] O(1) sb l... |
665 |
spin_lock(&sb_lock); |
df40c01a9 In get_super() an... |
666 667 |
__put_super(sb); goto rescan; |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 672 |
} } spin_unlock(&sb_lock); return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
673 |
/** |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 677 678 679 680 681 682 683 684 |
* do_remount_sb - asks filesystem to change mount options. * @sb: superblock in question * @flags: numeric part of options * @data: the rest of options * @force: whether or not to force the change * * Alters the mount options of a mounted file system. */ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) { int retval; |
c79d967de quota: move remou... |
685 |
int remount_ro; |
4504230a7 freeze_bdev: grab... |
686 687 688 |
if (sb->s_frozen != SB_UNFROZEN) return -EBUSY; |
9361401eb [PATCH] BLOCK: Ma... |
689 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
690 691 |
if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev)) return -EACCES; |
9361401eb [PATCH] BLOCK: Ma... |
692 |
#endif |
4504230a7 freeze_bdev: grab... |
693 |
|
1da177e4c Linux-2.6.12-rc2 |
694 695 696 |
if (flags & MS_RDONLY) acct_auto_close(sb); shrink_dcache_sb(sb); |
60b0680fa vfs: Rename fsync... |
697 |
sync_filesystem(sb); |
1da177e4c Linux-2.6.12-rc2 |
698 |
|
d208bbdda fs: improve remou... |
699 |
remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY); |
d208bbdda fs: improve remou... |
700 |
|
1da177e4c Linux-2.6.12-rc2 |
701 702 |
/* If we are remounting RDONLY and current sb is read/write, make sure there are no rw files opened */ |
d208bbdda fs: improve remou... |
703 |
if (remount_ro) { |
1da177e4c Linux-2.6.12-rc2 |
704 705 |
if (force) mark_files_ro(sb); |
b0895513f remove unlock_ker... |
706 |
else if (!fs_may_remount_ro(sb)) |
1da177e4c Linux-2.6.12-rc2 |
707 708 709 710 |
return -EBUSY; } if (sb->s_op->remount_fs) { |
1da177e4c Linux-2.6.12-rc2 |
711 |
retval = sb->s_op->remount_fs(sb, &flags, data); |
2833eb2b4 vfs: ignore error... |
712 713 714 715 716 717 718 719 |
if (retval) { if (!force) return retval; /* If forced remount, go ahead despite any errors */ WARN(1, "forced remount of a %s fs returned %i ", sb->s_type->name, retval); } |
1da177e4c Linux-2.6.12-rc2 |
720 721 |
} sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK); |
c79d967de quota: move remou... |
722 |
|
d208bbdda fs: improve remou... |
723 724 725 726 727 728 729 730 731 732 |
/* * Some filesystems modify their metadata via some other path than the * bdev buffer cache (eg. use a private mapping, or directories in * pagecache, etc). Also file data modifications go via their own * mappings. So If we try to mount readonly then copy the filesystem * from bdev, we could get stale data, so invalidate it to give a best * effort at coherency. */ if (remount_ro && sb->s_bdev) invalidate_bdev(sb->s_bdev); |
1da177e4c Linux-2.6.12-rc2 |
733 734 |
return 0; } |
a2a9537ac Get rid of pdflus... |
735 |
static void do_emergency_remount(struct work_struct *work) |
1da177e4c Linux-2.6.12-rc2 |
736 |
{ |
dca332528 no need for list_... |
737 |
struct super_block *sb, *p = NULL; |
1da177e4c Linux-2.6.12-rc2 |
738 739 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
740 |
list_for_each_entry(sb, &super_blocks, s_list) { |
551de6f34 Leave superblocks... |
741 742 |
if (list_empty(&sb->s_instances)) continue; |
1da177e4c Linux-2.6.12-rc2 |
743 744 |
sb->s_count++; spin_unlock(&sb_lock); |
443b94baa Make sure that al... |
745 |
down_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
746 747 |
if (sb->s_root && sb->s_bdev && !(sb->s_flags & MS_RDONLY)) { /* |
1da177e4c Linux-2.6.12-rc2 |
748 749 |
* What lock protects sb->s_flags?? */ |
1da177e4c Linux-2.6.12-rc2 |
750 |
do_remount_sb(sb, MS_RDONLY, NULL, 1); |
1da177e4c Linux-2.6.12-rc2 |
751 |
} |
443b94baa Make sure that al... |
752 |
up_write(&sb->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
753 |
spin_lock(&sb_lock); |
dca332528 no need for list_... |
754 755 756 |
if (p) __put_super(p); p = sb; |
1da177e4c Linux-2.6.12-rc2 |
757 |
} |
dca332528 no need for list_... |
758 759 |
if (p) __put_super(p); |
1da177e4c Linux-2.6.12-rc2 |
760 |
spin_unlock(&sb_lock); |
a2a9537ac Get rid of pdflus... |
761 |
kfree(work); |
1da177e4c Linux-2.6.12-rc2 |
762 763 764 765 766 767 |
printk("Emergency Remount complete "); } void emergency_remount(void) { |
a2a9537ac Get rid of pdflus... |
768 769 770 771 772 773 774 |
struct work_struct *work; work = kmalloc(sizeof(*work), GFP_ATOMIC); if (work) { INIT_WORK(work, do_emergency_remount); schedule_work(work); } |
1da177e4c Linux-2.6.12-rc2 |
775 776 777 778 779 780 |
} /* * Unnamed block devices are dummy devices used by virtual * filesystems which don't use real block-devices. -- jrs */ |
ad76cbc63 [PATCH 2/2] anond... |
781 |
static DEFINE_IDA(unnamed_dev_ida); |
1da177e4c Linux-2.6.12-rc2 |
782 |
static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */ |
c63e09ecc Make allocation o... |
783 |
static int unnamed_dev_start = 0; /* don't bother trying below it */ |
1da177e4c Linux-2.6.12-rc2 |
784 |
|
0ee5dc676 btrfs: kill magic... |
785 |
int get_anon_bdev(dev_t *p) |
1da177e4c Linux-2.6.12-rc2 |
786 787 788 789 790 |
{ int dev; int error; retry: |
ad76cbc63 [PATCH 2/2] anond... |
791 |
if (ida_pre_get(&unnamed_dev_ida, GFP_ATOMIC) == 0) |
1da177e4c Linux-2.6.12-rc2 |
792 793 |
return -ENOMEM; spin_lock(&unnamed_dev_lock); |
c63e09ecc Make allocation o... |
794 |
error = ida_get_new_above(&unnamed_dev_ida, unnamed_dev_start, &dev); |
f21f62208 ... and the same ... |
795 796 |
if (!error) unnamed_dev_start = dev + 1; |
1da177e4c Linux-2.6.12-rc2 |
797 798 799 800 801 802 803 804 805 |
spin_unlock(&unnamed_dev_lock); if (error == -EAGAIN) /* We raced and lost with another CPU. */ goto retry; else if (error) return -EAGAIN; if ((dev & MAX_ID_MASK) == (1 << MINORBITS)) { spin_lock(&unnamed_dev_lock); |
ad76cbc63 [PATCH 2/2] anond... |
806 |
ida_remove(&unnamed_dev_ida, dev); |
f21f62208 ... and the same ... |
807 808 |
if (unnamed_dev_start > dev) unnamed_dev_start = dev; |
1da177e4c Linux-2.6.12-rc2 |
809 810 811 |
spin_unlock(&unnamed_dev_lock); return -EMFILE; } |
0ee5dc676 btrfs: kill magic... |
812 |
*p = MKDEV(0, dev & MINORMASK); |
1da177e4c Linux-2.6.12-rc2 |
813 814 |
return 0; } |
0ee5dc676 btrfs: kill magic... |
815 |
EXPORT_SYMBOL(get_anon_bdev); |
1da177e4c Linux-2.6.12-rc2 |
816 |
|
0ee5dc676 btrfs: kill magic... |
817 |
void free_anon_bdev(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
818 |
{ |
0ee5dc676 btrfs: kill magic... |
819 |
int slot = MINOR(dev); |
1da177e4c Linux-2.6.12-rc2 |
820 |
spin_lock(&unnamed_dev_lock); |
ad76cbc63 [PATCH 2/2] anond... |
821 |
ida_remove(&unnamed_dev_ida, slot); |
c63e09ecc Make allocation o... |
822 823 |
if (slot < unnamed_dev_start) unnamed_dev_start = slot; |
1da177e4c Linux-2.6.12-rc2 |
824 825 |
spin_unlock(&unnamed_dev_lock); } |
0ee5dc676 btrfs: kill magic... |
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 |
EXPORT_SYMBOL(free_anon_bdev); int set_anon_super(struct super_block *s, void *data) { int error = get_anon_bdev(&s->s_dev); if (!error) s->s_bdi = &noop_backing_dev_info; return error; } EXPORT_SYMBOL(set_anon_super); void kill_anon_super(struct super_block *sb) { dev_t dev = sb->s_dev; generic_shutdown_super(sb); free_anon_bdev(dev); } |
1da177e4c Linux-2.6.12-rc2 |
844 845 |
EXPORT_SYMBOL(kill_anon_super); |
1da177e4c Linux-2.6.12-rc2 |
846 847 848 849 850 851 852 853 |
void kill_litter_super(struct super_block *sb) { if (sb->s_root) d_genocide(sb->s_root); kill_anon_super(sb); } EXPORT_SYMBOL(kill_litter_super); |
909e6d947 namespaces: move ... |
854 855 856 857 858 859 860 861 862 863 |
static int ns_test_super(struct super_block *sb, void *data) { return sb->s_fs_info == data; } static int ns_set_super(struct super_block *sb, void *data) { sb->s_fs_info = data; return set_anon_super(sb, NULL); } |
ceefda693 switch get_sb_ns(... |
864 865 |
struct dentry *mount_ns(struct file_system_type *fs_type, int flags, void *data, int (*fill_super)(struct super_block *, void *, int)) |
909e6d947 namespaces: move ... |
866 867 868 869 870 |
{ struct super_block *sb; sb = sget(fs_type, ns_test_super, ns_set_super, data); if (IS_ERR(sb)) |
ceefda693 switch get_sb_ns(... |
871 |
return ERR_CAST(sb); |
909e6d947 namespaces: move ... |
872 873 874 875 876 877 |
if (!sb->s_root) { int err; sb->s_flags = flags; err = fill_super(sb, data, flags & MS_SILENT ? 1 : 0); if (err) { |
74dbbdd7f New helper: deact... |
878 |
deactivate_locked_super(sb); |
ceefda693 switch get_sb_ns(... |
879 |
return ERR_PTR(err); |
909e6d947 namespaces: move ... |
880 881 882 883 |
} sb->s_flags |= MS_ACTIVE; } |
ceefda693 switch get_sb_ns(... |
884 |
return dget(sb->s_root); |
909e6d947 namespaces: move ... |
885 |
} |
ceefda693 switch get_sb_ns(... |
886 |
EXPORT_SYMBOL(mount_ns); |
909e6d947 namespaces: move ... |
887 |
|
9361401eb [PATCH] BLOCK: Ma... |
888 |
#ifdef CONFIG_BLOCK |
1da177e4c Linux-2.6.12-rc2 |
889 890 891 892 |
static int set_bdev_super(struct super_block *s, void *data) { s->s_bdev = data; s->s_dev = s->s_bdev->bd_dev; |
32a88aa1b fs: Assign bdi in... |
893 894 895 896 897 898 |
/* * We set the bdi here to the queue backing, file systems can * overwrite this in ->fill_super() */ s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; |
1da177e4c Linux-2.6.12-rc2 |
899 900 901 902 903 904 905 |
return 0; } static int test_bdev_super(struct super_block *s, void *data) { return (void *)s->s_bdev == data; } |
152a08366 new helper: mount... |
906 |
struct dentry *mount_bdev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
907 |
int flags, const char *dev_name, void *data, |
152a08366 new helper: mount... |
908 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
909 910 911 |
{ struct block_device *bdev; struct super_block *s; |
d4d776299 block: clean up b... |
912 |
fmode_t mode = FMODE_READ | FMODE_EXCL; |
1da177e4c Linux-2.6.12-rc2 |
913 |
int error = 0; |
30c40d2c0 [PATCH] propagate... |
914 915 |
if (!(flags & MS_RDONLY)) mode |= FMODE_WRITE; |
d4d776299 block: clean up b... |
916 |
bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
1da177e4c Linux-2.6.12-rc2 |
917 |
if (IS_ERR(bdev)) |
152a08366 new helper: mount... |
918 |
return ERR_CAST(bdev); |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 924 |
/* * once the super is inserted into the list by sget, s_umount * will protect the lockfs code from trying to start a snapshot * while we are mounting */ |
4fadd7bb2 freeze_bdev: kill... |
925 926 927 928 929 930 |
mutex_lock(&bdev->bd_fsfreeze_mutex); if (bdev->bd_fsfreeze_count > 0) { mutex_unlock(&bdev->bd_fsfreeze_mutex); error = -EBUSY; goto error_bdev; } |
1da177e4c Linux-2.6.12-rc2 |
931 |
s = sget(fs_type, test_bdev_super, set_bdev_super, bdev); |
4fadd7bb2 freeze_bdev: kill... |
932 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
933 |
if (IS_ERR(s)) |
454e2398b [PATCH] VFS: Perm... |
934 |
goto error_s; |
1da177e4c Linux-2.6.12-rc2 |
935 936 937 |
if (s->s_root) { if ((flags ^ s->s_flags) & MS_RDONLY) { |
74dbbdd7f New helper: deact... |
938 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
939 940 |
error = -EBUSY; goto error_bdev; |
1da177e4c Linux-2.6.12-rc2 |
941 |
} |
454e2398b [PATCH] VFS: Perm... |
942 |
|
4f331f01b vfs: don't hold s... |
943 944 |
/* * s_umount nests inside bd_mutex during |
e525fd89d block: make blkde... |
945 946 947 948 |
* __invalidate_device(). blkdev_put() acquires * bd_mutex and can't be called under s_umount. Drop * s_umount temporarily. This is safe as we're * holding an active reference. |
4f331f01b vfs: don't hold s... |
949 950 |
*/ up_write(&s->s_umount); |
d4d776299 block: clean up b... |
951 |
blkdev_put(bdev, mode); |
4f331f01b vfs: don't hold s... |
952 |
down_write(&s->s_umount); |
1da177e4c Linux-2.6.12-rc2 |
953 954 |
} else { char b[BDEVNAME_SIZE]; |
9e1f1de02 more conservative... |
955 |
s->s_flags = flags | MS_NOSEC; |
30c40d2c0 [PATCH] propagate... |
956 |
s->s_mode = mode; |
1da177e4c Linux-2.6.12-rc2 |
957 |
strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
e78c9a004 [PATCH] fs: remov... |
958 |
sb_set_blocksize(s, block_size(bdev)); |
9b04c997b [PATCH] vfs: MS_V... |
959 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
960 |
if (error) { |
74dbbdd7f New helper: deact... |
961 |
deactivate_locked_super(s); |
454e2398b [PATCH] VFS: Perm... |
962 |
goto error; |
fa675765a Revert mount/umou... |
963 |
} |
454e2398b [PATCH] VFS: Perm... |
964 965 |
s->s_flags |= MS_ACTIVE; |
87d8fe1ee add releasepage h... |
966 |
bdev->bd_super = s; |
1da177e4c Linux-2.6.12-rc2 |
967 |
} |
152a08366 new helper: mount... |
968 |
return dget(s->s_root); |
1da177e4c Linux-2.6.12-rc2 |
969 |
|
454e2398b [PATCH] VFS: Perm... |
970 971 972 |
error_s: error = PTR_ERR(s); error_bdev: |
d4d776299 block: clean up b... |
973 |
blkdev_put(bdev, mode); |
454e2398b [PATCH] VFS: Perm... |
974 |
error: |
152a08366 new helper: mount... |
975 976 977 |
return ERR_PTR(error); } EXPORT_SYMBOL(mount_bdev); |
1da177e4c Linux-2.6.12-rc2 |
978 979 980 |
void kill_block_super(struct super_block *sb) { struct block_device *bdev = sb->s_bdev; |
30c40d2c0 [PATCH] propagate... |
981 |
fmode_t mode = sb->s_mode; |
1da177e4c Linux-2.6.12-rc2 |
982 |
|
ddbaaf302 NULL noise in fs/... |
983 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
984 985 |
generic_shutdown_super(sb); sync_blockdev(bdev); |
d4d776299 block: clean up b... |
986 |
WARN_ON_ONCE(!(mode & FMODE_EXCL)); |
e525fd89d block: make blkde... |
987 |
blkdev_put(bdev, mode | FMODE_EXCL); |
1da177e4c Linux-2.6.12-rc2 |
988 989 990 |
} EXPORT_SYMBOL(kill_block_super); |
9361401eb [PATCH] BLOCK: Ma... |
991 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
992 |
|
3c26ff6e4 convert get_sb_no... |
993 |
struct dentry *mount_nodev(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
994 |
int flags, void *data, |
3c26ff6e4 convert get_sb_no... |
995 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
996 997 998 999 1000 |
{ int error; struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL); if (IS_ERR(s)) |
3c26ff6e4 convert get_sb_no... |
1001 |
return ERR_CAST(s); |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 |
s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
1004 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1005 |
if (error) { |
74dbbdd7f New helper: deact... |
1006 |
deactivate_locked_super(s); |
3c26ff6e4 convert get_sb_no... |
1007 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1008 1009 |
} s->s_flags |= MS_ACTIVE; |
3c26ff6e4 convert get_sb_no... |
1010 |
return dget(s->s_root); |
1da177e4c Linux-2.6.12-rc2 |
1011 |
} |
3c26ff6e4 convert get_sb_no... |
1012 |
EXPORT_SYMBOL(mount_nodev); |
1da177e4c Linux-2.6.12-rc2 |
1013 1014 1015 1016 |
static int compare_single(struct super_block *s, void *p) { return 1; } |
fc14f2fef convert get_sb_si... |
1017 |
struct dentry *mount_single(struct file_system_type *fs_type, |
1da177e4c Linux-2.6.12-rc2 |
1018 |
int flags, void *data, |
fc14f2fef convert get_sb_si... |
1019 |
int (*fill_super)(struct super_block *, void *, int)) |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 1022 1023 1024 1025 |
{ struct super_block *s; int error; s = sget(fs_type, compare_single, set_anon_super, NULL); if (IS_ERR(s)) |
fc14f2fef convert get_sb_si... |
1026 |
return ERR_CAST(s); |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 |
if (!s->s_root) { s->s_flags = flags; |
9b04c997b [PATCH] vfs: MS_V... |
1029 |
error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1030 |
if (error) { |
74dbbdd7f New helper: deact... |
1031 |
deactivate_locked_super(s); |
fc14f2fef convert get_sb_si... |
1032 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1033 1034 |
} s->s_flags |= MS_ACTIVE; |
9329d1bea vfs: get_sb_singl... |
1035 1036 |
} else { do_remount_sb(s, flags, data, 0); |
1da177e4c Linux-2.6.12-rc2 |
1037 |
} |
fc14f2fef convert get_sb_si... |
1038 1039 1040 |
return dget(s->s_root); } EXPORT_SYMBOL(mount_single); |
9d412a43c vfs: split off vf... |
1041 1042 |
struct dentry * mount_fs(struct file_system_type *type, int flags, const char *name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
1043 |
{ |
c96e41e92 beginning of tran... |
1044 |
struct dentry *root; |
9d412a43c vfs: split off vf... |
1045 |
struct super_block *sb; |
1da177e4c Linux-2.6.12-rc2 |
1046 |
char *secdata = NULL; |
9d412a43c vfs: split off vf... |
1047 |
int error = -ENOMEM; |
8089352a1 Mirror MS_KERNMOU... |
1048 |
|
e00075298 LSM/SELinux: Inte... |
1049 |
if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) { |
1da177e4c Linux-2.6.12-rc2 |
1050 |
secdata = alloc_secdata(); |
454e2398b [PATCH] VFS: Perm... |
1051 |
if (!secdata) |
9d412a43c vfs: split off vf... |
1052 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1053 |
|
e00075298 LSM/SELinux: Inte... |
1054 |
error = security_sb_copy_data(data, secdata); |
454e2398b [PATCH] VFS: Perm... |
1055 |
if (error) |
1da177e4c Linux-2.6.12-rc2 |
1056 |
goto out_free_secdata; |
1da177e4c Linux-2.6.12-rc2 |
1057 |
} |
1a102ff92 vfs: bury ->get_sb() |
1058 1059 1060 1061 |
root = type->mount(type, flags, name, data); if (IS_ERR(root)) { error = PTR_ERR(root); goto out_free_secdata; |
c96e41e92 beginning of tran... |
1062 |
} |
9d412a43c vfs: split off vf... |
1063 1064 1065 |
sb = root->d_sb; BUG_ON(!sb); WARN_ON(!sb->s_bdi); |
6c5103890 Merge branch 'for... |
1066 |
WARN_ON(sb->s_bdi == &default_backing_dev_info); |
9d412a43c vfs: split off vf... |
1067 |
sb->s_flags |= MS_BORN; |
454e2398b [PATCH] VFS: Perm... |
1068 |
|
9d412a43c vfs: split off vf... |
1069 |
error = security_sb_kern_mount(sb, flags, secdata); |
5129a469a Catch filesystems... |
1070 1071 |
if (error) goto out_sb; |
454e2398b [PATCH] VFS: Perm... |
1072 |
|
42cb56ae2 vfs: change sb->s... |
1073 1074 1075 1076 |
/* * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE * but s_maxbytes was an unsigned long long for many releases. Throw * this warning for a little while to try and catch filesystems that |
4358b5678 VFS: trivial: fix... |
1077 |
* violate this rule. |
42cb56ae2 vfs: change sb->s... |
1078 |
*/ |
9d412a43c vfs: split off vf... |
1079 1080 1081 |
WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to " "negative value (%lld) ", type->name, sb->s_maxbytes); |
42cb56ae2 vfs: change sb->s... |
1082 |
|
9d412a43c vfs: split off vf... |
1083 |
up_write(&sb->s_umount); |
8680e22f2 [PATCH] VFS: memo... |
1084 |
free_secdata(secdata); |
9d412a43c vfs: split off vf... |
1085 |
return root; |
1da177e4c Linux-2.6.12-rc2 |
1086 |
out_sb: |
9d412a43c vfs: split off vf... |
1087 1088 |
dput(root); deactivate_locked_super(sb); |
1da177e4c Linux-2.6.12-rc2 |
1089 1090 |
out_free_secdata: free_secdata(secdata); |
1da177e4c Linux-2.6.12-rc2 |
1091 |
out: |
454e2398b [PATCH] VFS: Perm... |
1092 |
return ERR_PTR(error); |
1da177e4c Linux-2.6.12-rc2 |
1093 |
} |
18e9e5104 Introduce freeze_... |
1094 |
/** |
7000d3c42 fs/super: fix ker... |
1095 1096 |
* freeze_super - lock the filesystem and force it into a consistent state * @sb: the super to lock |
18e9e5104 Introduce freeze_... |
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 |
* * Syncs the super to make sure the filesystem is consistent and calls the fs's * freeze_fs. Subsequent calls to this without first thawing the fs will return * -EBUSY. */ int freeze_super(struct super_block *sb) { int ret; atomic_inc(&sb->s_active); down_write(&sb->s_umount); if (sb->s_frozen) { deactivate_locked_super(sb); return -EBUSY; } if (sb->s_flags & MS_RDONLY) { sb->s_frozen = SB_FREEZE_TRANS; smp_wmb(); up_write(&sb->s_umount); return 0; } sb->s_frozen = SB_FREEZE_WRITE; smp_wmb(); sync_filesystem(sb); sb->s_frozen = SB_FREEZE_TRANS; smp_wmb(); sync_blockdev(sb->s_bdev); if (sb->s_op->freeze_fs) { ret = sb->s_op->freeze_fs(sb); if (ret) { printk(KERN_ERR "VFS:Filesystem freeze failed "); sb->s_frozen = SB_UNFROZEN; deactivate_locked_super(sb); return ret; } } up_write(&sb->s_umount); return 0; } EXPORT_SYMBOL(freeze_super); /** * thaw_super -- unlock filesystem * @sb: the super to thaw * * Unlocks the filesystem and marks it writeable again after freeze_super(). */ int thaw_super(struct super_block *sb) { int error; down_write(&sb->s_umount); if (sb->s_frozen == SB_UNFROZEN) { up_write(&sb->s_umount); return -EINVAL; } if (sb->s_flags & MS_RDONLY) goto out; if (sb->s_op->unfreeze_fs) { error = sb->s_op->unfreeze_fs(sb); if (error) { printk(KERN_ERR "VFS:Filesystem thaw failed "); sb->s_frozen = SB_FREEZE_TRANS; up_write(&sb->s_umount); return error; } } out: sb->s_frozen = SB_UNFROZEN; smp_wmb(); wake_up(&sb->s_wait_unfrozen); deactivate_locked_super(sb); return 0; } EXPORT_SYMBOL(thaw_super); |