Blame view
fs/configfs/dir.c
49.4 KB
7063fbf22 [PATCH] configfs:... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 |
/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * dir.c - Operations for configfs directories. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. * * Based on sysfs: * sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel * * configfs Copyright (C) 2005 Oracle. All rights reserved. */ #undef DEBUG #include <linux/fs.h> #include <linux/mount.h> #include <linux/module.h> #include <linux/slab.h> |
107ed40bd configfs: Make co... |
33 |
#include <linux/err.h> |
7063fbf22 [PATCH] configfs:... |
34 35 36 37 38 |
#include <linux/configfs.h> #include "configfs_internal.h" DECLARE_RWSEM(configfs_rename_sem); |
6f6107640 configfs: Introdu... |
39 40 |
/* * Protects mutations of configfs_dirent linkage together with proper i_mutex |
5301a77da configfs: Protect... |
41 |
* Also protects mutations of symlinks linkage to target configfs_dirent |
6f6107640 configfs: Introdu... |
42 43 |
* Mutators of configfs_dirent linkage must *both* have the proper inode locked * and configfs_dirent_lock locked, in that order. |
5301a77da configfs: Protect... |
44 45 |
* This allows one to safely traverse configfs_dirent trees and symlinks without * having to lock inodes. |
b3e76af87 configfs: Fix dea... |
46 47 48 49 |
* * Protects setting of CONFIGFS_USET_DROPPING: checking the flag * unlocked is not reliable unless in detach_groups() called from * rmdir()/unregister() and from configfs_attach_group() |
6f6107640 configfs: Introdu... |
50 51 |
*/ DEFINE_SPINLOCK(configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
52 53 54 55 |
static void configfs_d_iput(struct dentry * dentry, struct inode * inode) { |
24307aa1e configfs: Fix rac... |
56 |
struct configfs_dirent *sd = dentry->d_fsdata; |
7063fbf22 [PATCH] configfs:... |
57 58 |
if (sd) { |
24307aa1e configfs: Fix rac... |
59 60 |
/* Coordinate with configfs_readdir */ spin_lock(&configfs_dirent_lock); |
76ae281f6 configfs: fix rac... |
61 62 63 64 65 66 67 68 69 70 |
/* Coordinate with configfs_attach_attr where will increase * sd->s_count and update sd->s_dentry to new allocated one. * Only set sd->dentry to null when this dentry is the only * sd owner. * If not do so, configfs_d_iput may run just after * configfs_attach_attr and set sd->s_dentry to null * even it's still in use. */ if (atomic_read(&sd->s_count) <= 2) sd->s_dentry = NULL; |
24307aa1e configfs: Fix rac... |
71 |
spin_unlock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
72 73 74 75 |
configfs_put(sd); } iput(inode); } |
d463a0c4b switch configfs |
76 |
const struct dentry_operations configfs_dentry_ops = { |
7063fbf22 [PATCH] configfs:... |
77 |
.d_iput = configfs_d_iput, |
b26d4cd38 consolidate simpl... |
78 |
.d_delete = always_delete_dentry, |
7063fbf22 [PATCH] configfs:... |
79 |
}; |
e74cc06df configfs: Silence... |
80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 |
#ifdef CONFIG_LOCKDEP /* * Helpers to make lockdep happy with our recursive locking of default groups' * inodes (see configfs_attach_group() and configfs_detach_group()). * We put default groups i_mutexes in separate classes according to their depth * from the youngest non-default group ancestor. * * For a non-default group A having default groups A/B, A/C, and A/C/D, default * groups A/B and A/C will have their inode's mutex in class * default_group_class[0], and default group A/C/D will be in * default_group_class[1]. * * The lock classes are declared and assigned in inode.c, according to the * s_depth value. * The s_depth value is initialized to -1, adjusted to >= 0 when attaching * default groups, and reset to -1 when all default groups are attached. During * attachment, if configfs_create() sees s_depth > 0, the lock class of the new * inode's mutex is set to default_group_class[s_depth - 1]. */ static void configfs_init_dirent_depth(struct configfs_dirent *sd) { sd->s_depth = -1; } static void configfs_set_dir_dirent_depth(struct configfs_dirent *parent_sd, struct configfs_dirent *sd) { int parent_depth = parent_sd->s_depth; if (parent_depth >= 0) sd->s_depth = parent_depth + 1; } static void configfs_adjust_dir_dirent_depth_before_populate(struct configfs_dirent *sd) { /* * item's i_mutex class is already setup, so s_depth is now only * used to set new sub-directories s_depth, which is always done * with item's i_mutex locked. */ /* * sd->s_depth == -1 iff we are a non default group. * else (we are a default group) sd->s_depth > 0 (see * create_dir()). */ if (sd->s_depth == -1) /* * We are a non default group and we are going to create * default groups. */ sd->s_depth = 0; } static void configfs_adjust_dir_dirent_depth_after_populate(struct configfs_dirent *sd) { /* We will not create default groups anymore. */ sd->s_depth = -1; } #else /* CONFIG_LOCKDEP */ static void configfs_init_dirent_depth(struct configfs_dirent *sd) { } static void configfs_set_dir_dirent_depth(struct configfs_dirent *parent_sd, struct configfs_dirent *sd) { } static void configfs_adjust_dir_dirent_depth_before_populate(struct configfs_dirent *sd) { } static void configfs_adjust_dir_dirent_depth_after_populate(struct configfs_dirent *sd) { } #endif /* CONFIG_LOCKDEP */ |
7063fbf22 [PATCH] configfs:... |
165 166 167 |
/* * Allocates a new configfs_dirent and links it to the parent configfs_dirent */ |
420118caa configfs: Rework ... |
168 169 |
static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent *parent_sd, void *element, int type) |
7063fbf22 [PATCH] configfs:... |
170 171 |
{ struct configfs_dirent * sd; |
c37622296 [PATCH] Transform... |
172 |
sd = kmem_cache_zalloc(configfs_dir_cachep, GFP_KERNEL); |
7063fbf22 [PATCH] configfs:... |
173 |
if (!sd) |
107ed40bd configfs: Make co... |
174 |
return ERR_PTR(-ENOMEM); |
7063fbf22 [PATCH] configfs:... |
175 |
|
7063fbf22 [PATCH] configfs:... |
176 177 178 |
atomic_set(&sd->s_count, 1); INIT_LIST_HEAD(&sd->s_links); INIT_LIST_HEAD(&sd->s_children); |
7063fbf22 [PATCH] configfs:... |
179 |
sd->s_element = element; |
420118caa configfs: Rework ... |
180 |
sd->s_type = type; |
e74cc06df configfs: Silence... |
181 |
configfs_init_dirent_depth(sd); |
6f6107640 configfs: Introdu... |
182 |
spin_lock(&configfs_dirent_lock); |
b3e76af87 configfs: Fix dea... |
183 184 185 186 187 |
if (parent_sd->s_type & CONFIGFS_USET_DROPPING) { spin_unlock(&configfs_dirent_lock); kmem_cache_free(configfs_dir_cachep, sd); return ERR_PTR(-ENOENT); } |
6f6107640 configfs: Introdu... |
188 189 |
list_add(&sd->s_sibling, &parent_sd->s_children); spin_unlock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
190 191 192 |
return sd; } |
b4c98f625 configfs: Prevent... |
193 194 195 196 197 198 199 |
/* * * Return -EEXIST if there is already a configfs element with the same * name for the same parent. * * called with parent inode's i_mutex held */ |
58d206c2f configfs: make co... |
200 201 |
static int configfs_dirent_exists(struct configfs_dirent *parent_sd, const unsigned char *new) |
b4c98f625 configfs: Prevent... |
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 |
{ struct configfs_dirent * sd; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_element) { const unsigned char *existing = configfs_get_name(sd); if (strcmp(existing, new)) continue; else return -EEXIST; } } return 0; } |
7063fbf22 [PATCH] configfs:... |
217 218 219 220 221 |
int configfs_make_dirent(struct configfs_dirent * parent_sd, struct dentry * dentry, void * element, umode_t mode, int type) { struct configfs_dirent * sd; |
420118caa configfs: Rework ... |
222 |
sd = configfs_new_dirent(parent_sd, element, type); |
107ed40bd configfs: Make co... |
223 224 |
if (IS_ERR(sd)) return PTR_ERR(sd); |
7063fbf22 [PATCH] configfs:... |
225 226 |
sd->s_mode = mode; |
7063fbf22 [PATCH] configfs:... |
227 |
sd->s_dentry = dentry; |
fbc8d4c04 config fs: avoid ... |
228 |
if (dentry) |
7063fbf22 [PATCH] configfs:... |
229 |
dentry->d_fsdata = configfs_get(sd); |
7063fbf22 [PATCH] configfs:... |
230 231 232 |
return 0; } |
c88b1e70a configfs: configf... |
233 |
static void init_dir(struct inode * inode) |
7063fbf22 [PATCH] configfs:... |
234 235 236 237 238 |
{ inode->i_op = &configfs_dir_inode_operations; inode->i_fop = &configfs_dir_operations; /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f4 [PATCH] r/o bind ... |
239 |
inc_nlink(inode); |
7063fbf22 [PATCH] configfs:... |
240 |
} |
c88b1e70a configfs: configf... |
241 |
static void configfs_init_file(struct inode * inode) |
7063fbf22 [PATCH] configfs:... |
242 243 244 |
{ inode->i_size = PAGE_SIZE; inode->i_fop = &configfs_file_operations; |
7063fbf22 [PATCH] configfs:... |
245 |
} |
03607ace8 configfs: impleme... |
246 247 248 249 250 |
static void configfs_init_bin_file(struct inode *inode) { inode->i_size = 0; inode->i_fop = &configfs_bin_file_operations; } |
c88b1e70a configfs: configf... |
251 |
static void init_symlink(struct inode * inode) |
7063fbf22 [PATCH] configfs:... |
252 253 |
{ inode->i_op = &configfs_symlink_inode_operations; |
7063fbf22 [PATCH] configfs:... |
254 |
} |
7063fbf22 [PATCH] configfs:... |
255 256 257 258 |
/** * configfs_create_dir - create a directory for an config_item. * @item: config_itemwe're creating directory for. * @dentry: config_item's dentry. |
2a109f2a4 [PATCH] configfs:... |
259 260 261 |
* * Note: user-created entries won't be allowed under this new directory * until it is validated by configfs_dir_set_ready() |
7063fbf22 [PATCH] configfs:... |
262 |
*/ |
1cf97d0d3 configfs: fold cr... |
263 |
static int configfs_create_dir(struct config_item *item, struct dentry *dentry) |
7063fbf22 [PATCH] configfs:... |
264 |
{ |
1cf97d0d3 configfs: fold cr... |
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 |
int error; umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; struct dentry *p = dentry->d_parent; BUG_ON(!item); error = configfs_dirent_exists(p->d_fsdata, dentry->d_name.name); if (unlikely(error)) return error; error = configfs_make_dirent(p->d_fsdata, dentry, item, mode, CONFIGFS_DIR | CONFIGFS_USET_CREATING); if (unlikely(error)) return error; configfs_set_dir_dirent_depth(p->d_fsdata, dentry->d_fsdata); error = configfs_create(dentry, mode, init_dir); if (!error) { |
2b0143b5c VFS: normal files... |
283 |
inc_nlink(d_inode(p)); |
7063fbf22 [PATCH] configfs:... |
284 |
item->ci_dentry = dentry; |
1cf97d0d3 configfs: fold cr... |
285 286 287 288 289 290 291 292 293 |
} else { struct configfs_dirent *sd = dentry->d_fsdata; if (sd) { spin_lock(&configfs_dirent_lock); list_del_init(&sd->s_sibling); spin_unlock(&configfs_dirent_lock); configfs_put(sd); } } |
7063fbf22 [PATCH] configfs:... |
294 295 |
return error; } |
2a109f2a4 [PATCH] configfs:... |
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 |
/* * Allow userspace to create new entries under a new directory created with * configfs_create_dir(), and under all of its chidlren directories recursively. * @sd configfs_dirent of the new directory to validate * * Caller must hold configfs_dirent_lock. */ static void configfs_dir_set_ready(struct configfs_dirent *sd) { struct configfs_dirent *child_sd; sd->s_type &= ~CONFIGFS_USET_CREATING; list_for_each_entry(child_sd, &sd->s_children, s_sibling) if (child_sd->s_type & CONFIGFS_USET_CREATING) configfs_dir_set_ready(child_sd); } /* * Check that a directory does not belong to a directory hierarchy being * attached and not validated yet. * @sd configfs_dirent of the directory to check * * @return non-zero iff the directory was validated * * Note: takes configfs_dirent_lock, so the result may change from false to true * in two consecutive calls, but never from true to false. */ int configfs_dirent_is_ready(struct configfs_dirent *sd) { int ret; spin_lock(&configfs_dirent_lock); ret = !(sd->s_type & CONFIGFS_USET_CREATING); spin_unlock(&configfs_dirent_lock); return ret; } |
7063fbf22 [PATCH] configfs:... |
333 334 335 336 337 338 |
int configfs_create_link(struct configfs_symlink *sl, struct dentry *parent, struct dentry *dentry) { int err = 0; umode_t mode = S_IFLNK | S_IRWXUGO; |
3d0f89bb1 configfs: Add per... |
339 340 |
err = configfs_make_dirent(parent->d_fsdata, dentry, sl, mode, CONFIGFS_ITEM_LINK); |
7063fbf22 [PATCH] configfs:... |
341 |
if (!err) { |
3d0f89bb1 configfs: Add per... |
342 |
err = configfs_create(dentry, mode, init_symlink); |
fbc8d4c04 config fs: avoid ... |
343 |
if (err) { |
3d0f89bb1 configfs: Add per... |
344 345 |
struct configfs_dirent *sd = dentry->d_fsdata; if (sd) { |
6f6107640 configfs: Introdu... |
346 |
spin_lock(&configfs_dirent_lock); |
3d0f89bb1 configfs: Add per... |
347 |
list_del_init(&sd->s_sibling); |
6f6107640 configfs: Introdu... |
348 |
spin_unlock(&configfs_dirent_lock); |
3d0f89bb1 configfs: Add per... |
349 350 351 |
configfs_put(sd); } } |
7063fbf22 [PATCH] configfs:... |
352 353 354 355 356 357 358 359 360 361 |
} return err; } static void remove_dir(struct dentry * d) { struct dentry * parent = dget(d->d_parent); struct configfs_dirent * sd; sd = d->d_fsdata; |
6f6107640 configfs: Introdu... |
362 |
spin_lock(&configfs_dirent_lock); |
e7515d065 configfs: Clear u... |
363 |
list_del_init(&sd->s_sibling); |
6f6107640 configfs: Introdu... |
364 |
spin_unlock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
365 |
configfs_put(sd); |
2b0143b5c VFS: normal files... |
366 367 |
if (d_really_is_positive(d)) simple_rmdir(d_inode(parent),d); |
7063fbf22 [PATCH] configfs:... |
368 |
|
a455589f1 assorted conversi... |
369 370 |
pr_debug(" o %pd removing done (%d) ", d, d_count(d)); |
7063fbf22 [PATCH] configfs:... |
371 372 373 374 375 376 377 378 379 380 381 |
dput(parent); } /** * configfs_remove_dir - remove an config_item's directory. * @item: config_item we're removing. * * The only thing special about this is that we remove any files in * the directory before we remove the directory, and we've inlined * what used to be configfs_rmdir() below, instead of calling separately. |
2e2ce171c [PATCH] configfs:... |
382 383 |
* * Caller holds the mutex of the item's inode |
7063fbf22 [PATCH] configfs:... |
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 |
*/ static void configfs_remove_dir(struct config_item * item) { struct dentry * dentry = dget(item->ci_dentry); if (!dentry) return; remove_dir(dentry); /** * Drop reference from dget() on entrance. */ dput(dentry); } /* attaches attribute's configfs_dirent to the dentry corresponding to the * attribute file */ static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry) { struct configfs_attribute * attr = sd->s_element; int error; |
76ae281f6 configfs: fix rac... |
408 |
spin_lock(&configfs_dirent_lock); |
3d0f89bb1 configfs: Add per... |
409 410 |
dentry->d_fsdata = configfs_get(sd); sd->s_dentry = dentry; |
76ae281f6 configfs: fix rac... |
411 |
spin_unlock(&configfs_dirent_lock); |
ce8d2cdf3 r/o bind mounts: ... |
412 |
error = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG, |
03607ace8 configfs: impleme... |
413 414 415 |
(sd->s_type & CONFIGFS_ITEM_BIN_ATTR) ? configfs_init_bin_file : configfs_init_file); |
5cf3b560a configfs: move d_... |
416 |
if (error) |
3d0f89bb1 configfs: Add per... |
417 |
configfs_put(sd); |
5cf3b560a configfs: move d_... |
418 |
return error; |
7063fbf22 [PATCH] configfs:... |
419 420 421 422 |
} static struct dentry * configfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3b stop passing name... |
423 |
unsigned int flags) |
7063fbf22 [PATCH] configfs:... |
424 425 426 427 |
{ struct configfs_dirent * parent_sd = dentry->d_parent->d_fsdata; struct configfs_dirent * sd; int found = 0; |
2a109f2a4 [PATCH] configfs:... |
428 429 430 431 432 433 434 435 436 437 438 439 440 |
int err; /* * Fake invisibility if dir belongs to a group/default groups hierarchy * being attached * * This forbids userspace to read/write attributes of items which may * not complete their initialization, since the dentries of the * attributes won't be instantiated. */ err = -ENOENT; if (!configfs_dirent_is_ready(parent_sd)) goto out; |
7063fbf22 [PATCH] configfs:... |
441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 |
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { if (sd->s_type & CONFIGFS_NOT_PINNED) { const unsigned char * name = configfs_get_name(sd); if (strcmp(name, dentry->d_name.name)) continue; found = 1; err = configfs_attach_attr(sd, dentry); break; } } if (!found) { /* * If it doesn't exist and it isn't a NOT_PINNED item, * it must be negative. */ |
fbc8d4c04 config fs: avoid ... |
460 461 |
if (dentry->d_name.len > NAME_MAX) return ERR_PTR(-ENAMETOOLONG); |
fbc8d4c04 config fs: avoid ... |
462 463 |
d_add(dentry, NULL); return NULL; |
7063fbf22 [PATCH] configfs:... |
464 |
} |
2a109f2a4 [PATCH] configfs:... |
465 |
out: |
7063fbf22 [PATCH] configfs:... |
466 467 468 469 470 |
return ERR_PTR(err); } /* * Only subdirectories count here. Files (CONFIGFS_NOT_PINNED) are |
b3e76af87 configfs: Fix dea... |
471 472 473 474 475 |
* attributes and are removed by rmdir(). We recurse, setting * CONFIGFS_USET_DROPPING on all children that are candidates for * default detach. * If there is an error, the caller will reset the flags via * configfs_detach_rollback(). |
7063fbf22 [PATCH] configfs:... |
476 |
*/ |
48f35b7b7 configfs_detach_p... |
477 |
static int configfs_detach_prep(struct dentry *dentry, struct dentry **wait) |
7063fbf22 [PATCH] configfs:... |
478 479 480 481 |
{ struct configfs_dirent *parent_sd = dentry->d_fsdata; struct configfs_dirent *sd; int ret; |
4768e9b18 [PATCH] configfs:... |
482 483 |
/* Mark that we're trying to drop the group */ parent_sd->s_type |= CONFIGFS_USET_DROPPING; |
7063fbf22 [PATCH] configfs:... |
484 485 486 487 488 489 |
ret = -EBUSY; if (!list_empty(&parent_sd->s_links)) goto out; ret = 0; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { |
99cefda42 [PATCH] configfs:... |
490 491 |
if (!sd->s_element || (sd->s_type & CONFIGFS_NOT_PINNED)) |
7063fbf22 [PATCH] configfs:... |
492 493 |
continue; if (sd->s_type & CONFIGFS_USET_DEFAULT) { |
6d8344bae configfs: Fix fai... |
494 495 |
/* Abort if racing with mkdir() */ if (sd->s_type & CONFIGFS_USET_IN_MKDIR) { |
48f35b7b7 configfs_detach_p... |
496 497 |
if (wait) *wait= dget(sd->s_dentry); |
6d8344bae configfs: Fix fai... |
498 499 |
return -EAGAIN; } |
7063fbf22 [PATCH] configfs:... |
500 |
|
631d1feba configfs: config ... |
501 502 503 504 |
/* * Yup, recursive. If there's a problem, blame * deep nesting of default_groups */ |
48f35b7b7 configfs_detach_p... |
505 |
ret = configfs_detach_prep(sd->s_dentry, wait); |
7063fbf22 [PATCH] configfs:... |
506 |
if (!ret) |
e7515d065 configfs: Clear u... |
507 |
continue; |
7063fbf22 [PATCH] configfs:... |
508 509 510 511 512 513 514 515 516 517 518 |
} else ret = -ENOTEMPTY; break; } out: return ret; } /* |
b3e76af87 configfs: Fix dea... |
519 |
* Walk the tree, resetting CONFIGFS_USET_DROPPING wherever it was |
7063fbf22 [PATCH] configfs:... |
520 521 522 523 524 525 |
* set. */ static void configfs_detach_rollback(struct dentry *dentry) { struct configfs_dirent *parent_sd = dentry->d_fsdata; struct configfs_dirent *sd; |
4768e9b18 [PATCH] configfs:... |
526 527 528 529 |
parent_sd->s_type &= ~CONFIGFS_USET_DROPPING; list_for_each_entry(sd, &parent_sd->s_children, s_sibling) if (sd->s_type & CONFIGFS_USET_DEFAULT) |
7063fbf22 [PATCH] configfs:... |
530 |
configfs_detach_rollback(sd->s_dentry); |
7063fbf22 [PATCH] configfs:... |
531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 |
} static void detach_attrs(struct config_item * item) { struct dentry * dentry = dget(item->ci_dentry); struct configfs_dirent * parent_sd; struct configfs_dirent * sd, * tmp; if (!dentry) return; pr_debug("configfs %s: dropping attrs for dir ", dentry->d_name.name); parent_sd = dentry->d_fsdata; list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) { if (!sd->s_element || !(sd->s_type & CONFIGFS_NOT_PINNED)) continue; |
6f6107640 configfs: Introdu... |
550 |
spin_lock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
551 |
list_del_init(&sd->s_sibling); |
6f6107640 configfs: Introdu... |
552 |
spin_unlock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
553 554 555 556 557 558 559 560 561 562 563 564 565 566 |
configfs_drop_dentry(sd, dentry); configfs_put(sd); } /** * Drop reference from dget() on entrance. */ dput(dentry); } static int populate_attrs(struct config_item *item) { struct config_item_type *t = item->ci_type; struct configfs_attribute *attr; |
03607ace8 configfs: impleme... |
567 |
struct configfs_bin_attribute *bin_attr; |
7063fbf22 [PATCH] configfs:... |
568 569 570 571 572 573 574 575 576 577 578 |
int error = 0; int i; if (!t) return -EINVAL; if (t->ct_attrs) { for (i = 0; (attr = t->ct_attrs[i]) != NULL; i++) { if ((error = configfs_create_file(item, attr))) break; } } |
03607ace8 configfs: impleme... |
579 580 581 582 583 584 585 |
if (t->ct_bin_attrs) { for (i = 0; (bin_attr = t->ct_bin_attrs[i]) != NULL; i++) { error = configfs_create_bin_file(item, bin_attr); if (error) break; } } |
7063fbf22 [PATCH] configfs:... |
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
if (error) detach_attrs(item); return error; } static int configfs_attach_group(struct config_item *parent_item, struct config_item *item, struct dentry *dentry); static void configfs_detach_group(struct config_item *item); static void detach_groups(struct config_group *group) { struct dentry * dentry = dget(group->cg_item.ci_dentry); struct dentry *child; struct configfs_dirent *parent_sd; struct configfs_dirent *sd, *tmp; if (!dentry) return; parent_sd = dentry->d_fsdata; list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) { if (!sd->s_element || !(sd->s_type & CONFIGFS_USET_DEFAULT)) continue; child = sd->s_dentry; |
5955102c9 wrappers for ->i_... |
615 |
inode_lock(d_inode(child)); |
b3e76af87 configfs: Fix dea... |
616 |
|
7063fbf22 [PATCH] configfs:... |
617 |
configfs_detach_group(sd->s_element); |
2b0143b5c VFS: normal files... |
618 |
d_inode(child)->i_flags |= S_DEAD; |
d83c49f3e Fix the regressio... |
619 |
dont_mount(child); |
7063fbf22 [PATCH] configfs:... |
620 |
|
5955102c9 wrappers for ->i_... |
621 |
inode_unlock(d_inode(child)); |
7063fbf22 [PATCH] configfs:... |
622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 |
d_delete(child); dput(child); } /** * Drop reference from dget() on entrance. */ dput(dentry); } /* * This fakes mkdir(2) on a default_groups[] entry. It * creates a dentry, attachs it, and then does fixup * on the sd->s_type. * * We could, perhaps, tweak our parent's ->mkdir for a minute and * try using vfs_mkdir. Just a thought. */ static int create_default_group(struct config_group *parent_group, struct config_group *group) { int ret; |
7063fbf22 [PATCH] configfs:... |
645 646 647 648 649 650 |
struct configfs_dirent *sd; /* We trust the caller holds a reference to parent */ struct dentry *child, *parent = parent_group->cg_item.ci_dentry; if (!group->cg_item.ci_name) group->cg_item.ci_name = group->cg_item.ci_namebuf; |
7063fbf22 [PATCH] configfs:... |
651 652 |
ret = -ENOMEM; |
ec193cf5a configfs: don't o... |
653 |
child = d_alloc_name(parent, group->cg_item.ci_name); |
7063fbf22 [PATCH] configfs:... |
654 655 656 657 658 659 660 661 662 |
if (child) { d_add(child, NULL); ret = configfs_attach_group(&parent_group->cg_item, &group->cg_item, child); if (!ret) { sd = child->d_fsdata; sd->s_type |= CONFIGFS_USET_DEFAULT; } else { |
2b0143b5c VFS: normal files... |
663 |
BUG_ON(d_inode(child)); |
df7f99670 configfs: Don't t... |
664 |
d_drop(child); |
7063fbf22 [PATCH] configfs:... |
665 666 667 668 669 670 671 672 673 674 |
dput(child); } } return ret; } static int populate_groups(struct config_group *group) { struct config_group *new_group; |
7063fbf22 [PATCH] configfs:... |
675 |
int ret = 0; |
7063fbf22 [PATCH] configfs:... |
676 |
|
1ae1602de configfs: switch ... |
677 678 679 680 681 |
list_for_each_entry(new_group, &group->default_groups, group_entry) { ret = create_default_group(group, new_group); if (ret) { detach_groups(group); break; |
7063fbf22 [PATCH] configfs:... |
682 |
} |
7063fbf22 [PATCH] configfs:... |
683 |
} |
7063fbf22 [PATCH] configfs:... |
684 685 |
return ret; } |
1ae1602de configfs: switch ... |
686 687 688 689 690 691 692 693 694 695 |
void configfs_remove_default_groups(struct config_group *group) { struct config_group *g, *n; list_for_each_entry_safe(g, n, &group->default_groups, group_entry) { list_del(&g->group_entry); config_item_put(&g->cg_item); } } EXPORT_SYMBOL(configfs_remove_default_groups); |
7063fbf22 [PATCH] configfs:... |
696 697 |
/* * All of link_obj/unlink_obj/link_group/unlink_group require that |
e6bd07aee configfs: Convert... |
698 |
* subsys->su_mutex is held. |
7063fbf22 [PATCH] configfs:... |
699 700 701 702 703 704 705 706 707 708 709 710 |
*/ static void unlink_obj(struct config_item *item) { struct config_group *group; group = item->ci_group; if (group) { list_del_init(&item->ci_entry); item->ci_group = NULL; item->ci_parent = NULL; |
eed7a0db4 configfs: configf... |
711 712 |
/* Drop the reference for ci_entry */ |
7063fbf22 [PATCH] configfs:... |
713 |
config_item_put(item); |
eed7a0db4 configfs: configf... |
714 |
/* Drop the reference for ci_parent */ |
7063fbf22 [PATCH] configfs:... |
715 716 717 718 719 720 |
config_group_put(group); } } static void link_obj(struct config_item *parent_item, struct config_item *item) { |
eed7a0db4 configfs: configf... |
721 722 723 724 |
/* * Parent seems redundant with group, but it makes certain * traversals much nicer. */ |
7063fbf22 [PATCH] configfs:... |
725 |
item->ci_parent = parent_item; |
eed7a0db4 configfs: configf... |
726 727 728 729 730 |
/* * We hold a reference on the parent for the child's ci_parent * link. */ |
7063fbf22 [PATCH] configfs:... |
731 732 |
item->ci_group = config_group_get(to_config_group(parent_item)); list_add_tail(&item->ci_entry, &item->ci_group->cg_children); |
eed7a0db4 configfs: configf... |
733 734 735 736 |
/* * We hold a reference on the child for ci_entry on the parent's * cg_children */ |
7063fbf22 [PATCH] configfs:... |
737 738 739 740 741 |
config_item_get(item); } static void unlink_group(struct config_group *group) { |
7063fbf22 [PATCH] configfs:... |
742 |
struct config_group *new_group; |
1ae1602de configfs: switch ... |
743 744 |
list_for_each_entry(new_group, &group->default_groups, group_entry) unlink_group(new_group); |
7063fbf22 [PATCH] configfs:... |
745 746 747 748 749 750 751 |
group->cg_subsys = NULL; unlink_obj(&group->cg_item); } static void link_group(struct config_group *parent_group, struct config_group *group) { |
7063fbf22 [PATCH] configfs:... |
752 753 754 755 756 757 758 759 760 761 762 763 |
struct config_group *new_group; struct configfs_subsystem *subsys = NULL; /* gcc is a turd */ link_obj(&parent_group->cg_item, &group->cg_item); if (parent_group->cg_subsys) subsys = parent_group->cg_subsys; else if (configfs_is_root(&parent_group->cg_item)) subsys = to_configfs_subsystem(group); else BUG(); group->cg_subsys = subsys; |
1ae1602de configfs: switch ... |
764 765 |
list_for_each_entry(new_group, &group->default_groups, group_entry) link_group(group, new_group); |
7063fbf22 [PATCH] configfs:... |
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 |
} /* * The goal is that configfs_attach_item() (and * configfs_attach_group()) can be called from either the VFS or this * module. That is, they assume that the items have been created, * the dentry allocated, and the dcache is all ready to go. * * If they fail, they must clean up after themselves as if they * had never been called. The caller (VFS or local function) will * handle cleaning up the dcache bits. * * configfs_detach_group() and configfs_detach_item() behave similarly on * the way out. They assume that the proper semaphores are held, they * clean up the configfs items, and they expect their callers will * handle the dcache bits. */ static int configfs_attach_item(struct config_item *parent_item, struct config_item *item, struct dentry *dentry) { int ret; ret = configfs_create_dir(item, dentry); if (!ret) { ret = populate_attrs(item); if (ret) { |
2e2ce171c [PATCH] configfs:... |
793 794 795 796 797 |
/* * We are going to remove an inode and its dentry but * the VFS may already have hit and used them. Thus, * we must lock them as rmdir() would. */ |
5955102c9 wrappers for ->i_... |
798 |
inode_lock(d_inode(dentry)); |
7063fbf22 [PATCH] configfs:... |
799 |
configfs_remove_dir(item); |
2b0143b5c VFS: normal files... |
800 |
d_inode(dentry)->i_flags |= S_DEAD; |
d83c49f3e Fix the regressio... |
801 |
dont_mount(dentry); |
5955102c9 wrappers for ->i_... |
802 |
inode_unlock(d_inode(dentry)); |
7063fbf22 [PATCH] configfs:... |
803 804 805 806 807 808 |
d_delete(dentry); } } return ret; } |
2e2ce171c [PATCH] configfs:... |
809 |
/* Caller holds the mutex of the item's inode */ |
7063fbf22 [PATCH] configfs:... |
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 |
static void configfs_detach_item(struct config_item *item) { detach_attrs(item); configfs_remove_dir(item); } static int configfs_attach_group(struct config_item *parent_item, struct config_item *item, struct dentry *dentry) { int ret; struct configfs_dirent *sd; ret = configfs_attach_item(parent_item, item, dentry); if (!ret) { sd = dentry->d_fsdata; sd->s_type |= CONFIGFS_USET_DIR; |
2e2ce171c [PATCH] configfs:... |
827 828 829 830 831 832 833 834 835 |
/* * FYI, we're faking mkdir in populate_groups() * We must lock the group's inode to avoid races with the VFS * which can already hit the inode and try to add/remove entries * under it. * * We must also lock the inode to remove it safely in case of * error, as rmdir() would. */ |
5955102c9 wrappers for ->i_... |
836 |
inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); |
e74cc06df configfs: Silence... |
837 |
configfs_adjust_dir_dirent_depth_before_populate(sd); |
7063fbf22 [PATCH] configfs:... |
838 839 840 |
ret = populate_groups(to_config_group(item)); if (ret) { configfs_detach_item(item); |
2b0143b5c VFS: normal files... |
841 |
d_inode(dentry)->i_flags |= S_DEAD; |
d83c49f3e Fix the regressio... |
842 |
dont_mount(dentry); |
7063fbf22 [PATCH] configfs:... |
843 |
} |
e74cc06df configfs: Silence... |
844 |
configfs_adjust_dir_dirent_depth_after_populate(sd); |
5955102c9 wrappers for ->i_... |
845 |
inode_unlock(d_inode(dentry)); |
2e2ce171c [PATCH] configfs:... |
846 847 |
if (ret) d_delete(dentry); |
7063fbf22 [PATCH] configfs:... |
848 849 850 851 |
} return ret; } |
2e2ce171c [PATCH] configfs:... |
852 |
/* Caller holds the mutex of the group's inode */ |
7063fbf22 [PATCH] configfs:... |
853 854 855 856 857 858 859 |
static void configfs_detach_group(struct config_item *item) { detach_groups(to_config_group(item)); configfs_detach_item(item); } /* |
299894cc9 configfs: accessi... |
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 |
* After the item has been detached from the filesystem view, we are * ready to tear it out of the hierarchy. Notify the client before * we do that so they can perform any cleanup that requires * navigating the hierarchy. A client does not need to provide this * callback. The subsystem semaphore MUST be held by the caller, and * references must be valid for both items. It also assumes the * caller has validated ci_type. */ static void client_disconnect_notify(struct config_item *parent_item, struct config_item *item) { struct config_item_type *type; type = parent_item->ci_type; BUG_ON(!type); if (type->ct_group_ops && type->ct_group_ops->disconnect_notify) type->ct_group_ops->disconnect_notify(to_config_group(parent_item), item); } /* |
7063fbf22 [PATCH] configfs:... |
882 883 884 885 886 887 888 889 890 891 892 893 |
* Drop the initial reference from make_item()/make_group() * This function assumes that reference is held on item * and that item holds a valid reference to the parent. Also, it * assumes the caller has validated ci_type. */ static void client_drop_item(struct config_item *parent_item, struct config_item *item) { struct config_item_type *type; type = parent_item->ci_type; BUG_ON(!type); |
eed7a0db4 configfs: configf... |
894 895 896 897 |
/* * If ->drop_item() exists, it is responsible for the * config_item_put(). */ |
7063fbf22 [PATCH] configfs:... |
898 899 |
if (type->ct_group_ops && type->ct_group_ops->drop_item) type->ct_group_ops->drop_item(to_config_group(parent_item), |
299894cc9 configfs: accessi... |
900 |
item); |
7063fbf22 [PATCH] configfs:... |
901 902 903 |
else config_item_put(item); } |
631d1feba configfs: config ... |
904 905 906 |
#ifdef DEBUG static void configfs_dump_one(struct configfs_dirent *sd, int level) { |
c66869313 fs/configfs: conv... |
907 908 |
pr_info("%*s\"%s\": ", level, " ", configfs_get_name(sd)); |
631d1feba configfs: config ... |
909 |
|
c66869313 fs/configfs: conv... |
910 911 |
#define type_print(_type) if (sd->s_type & _type) pr_info("%*s %s ", level, " ", #_type); |
631d1feba configfs: config ... |
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 |
type_print(CONFIGFS_ROOT); type_print(CONFIGFS_DIR); type_print(CONFIGFS_ITEM_ATTR); type_print(CONFIGFS_ITEM_LINK); type_print(CONFIGFS_USET_DIR); type_print(CONFIGFS_USET_DEFAULT); type_print(CONFIGFS_USET_DROPPING); #undef type_print } static int configfs_dump(struct configfs_dirent *sd, int level) { struct configfs_dirent *child_sd; int ret = 0; configfs_dump_one(sd, level); if (!(sd->s_type & (CONFIGFS_DIR|CONFIGFS_ROOT))) return 0; list_for_each_entry(child_sd, &sd->s_children, s_sibling) { ret = configfs_dump(child_sd, level + 2); if (ret) break; } return ret; } #endif /* * configfs_depend_item() and configfs_undepend_item() * * WARNING: Do not call these from a configfs callback! * * This describes these functions and their helpers. * * Allow another kernel system to depend on a config_item. If this |
25985edce Fix common misspe... |
951 |
* happens, the item cannot go away until the dependent can live without |
631d1feba configfs: config ... |
952 953 954 955 956 957 958 959 960 961 962 963 964 965 |
* it. The idea is to give client modules as simple an interface as * possible. When a system asks them to depend on an item, they just * call configfs_depend_item(). If the item is live and the client * driver is in good shape, we'll happily do the work for them. * * Why is the locking complex? Because configfs uses the VFS to handle * all locking, but this function is called outside the normal * VFS->configfs path. So it must take VFS locks to prevent the * VFS->configfs stuff (configfs_mkdir(), configfs_rmdir(), etc). This is * why you can't call these functions underneath configfs callbacks. * * Note, btw, that this can be called at *any* time, even when a configfs * subsystem isn't registered, or when configfs is loading or unloading. * Just like configfs_register_subsystem(). So we take the same |
420118caa configfs: Rework ... |
966 967 |
* precautions. We pin the filesystem. We lock configfs_dirent_lock. * If we can find the target item in the |
631d1feba configfs: config ... |
968 |
* configfs tree, it must be part of the subsystem tree as well, so we |
420118caa configfs: Rework ... |
969 970 |
* do not need the subsystem semaphore. Holding configfs_dirent_lock helps * locking out mkdir() and rmdir(), who might be racing us. |
631d1feba configfs: config ... |
971 972 973 974 975 976 977 978 979 980 981 982 |
*/ /* * configfs_depend_prep() * * Only subdirectories count here. Files (CONFIGFS_NOT_PINNED) are * attributes. This is similar but not the same to configfs_detach_prep(). * Note that configfs_detach_prep() expects the parent to be locked when it * is called, but we lock the parent *inside* configfs_depend_prep(). We * do that so we can unlock it if we find nothing. * * Here we do a depth-first search of the dentry hierarchy looking for |
420118caa configfs: Rework ... |
983 984 985 986 987 988 989 990 991 |
* our object. * We deliberately ignore items tagged as dropping since they are virtually * dead, as well as items in the middle of attachment since they virtually * do not exist yet. This completes the locking out of racing mkdir() and * rmdir(). * Note: subdirectories in the middle of attachment start with s_type = * CONFIGFS_DIR|CONFIGFS_USET_CREATING set by create_dir(). When * CONFIGFS_USET_CREATING is set, we ignore the item. The actual set of * s_type is in configfs_new_dirent(), which has configfs_dirent_lock. |
631d1feba configfs: config ... |
992 |
* |
420118caa configfs: Rework ... |
993 |
* If the target is not found, -ENOENT is bubbled up. |
631d1feba configfs: config ... |
994 995 996 |
* * This adds a requirement that all config_items be unique! * |
420118caa configfs: Rework ... |
997 |
* This is recursive. There isn't |
631d1feba configfs: config ... |
998 999 1000 1001 1002 1003 |
* much on the stack, though, so folks that need this function - be careful * about your stack! Patches will be accepted to make it iterative. */ static int configfs_depend_prep(struct dentry *origin, struct config_item *target) { |
49deb4bc2 configfs: move th... |
1004 |
struct configfs_dirent *child_sd, *sd; |
631d1feba configfs: config ... |
1005 |
int ret = 0; |
49deb4bc2 configfs: move th... |
1006 1007 |
BUG_ON(!origin || !origin->d_fsdata); sd = origin->d_fsdata; |
631d1feba configfs: config ... |
1008 |
|
631d1feba configfs: config ... |
1009 1010 1011 1012 |
if (sd->s_element == target) /* Boo-yah */ goto out; list_for_each_entry(child_sd, &sd->s_children, s_sibling) { |
420118caa configfs: Rework ... |
1013 1014 1015 |
if ((child_sd->s_type & CONFIGFS_DIR) && !(child_sd->s_type & CONFIGFS_USET_DROPPING) && !(child_sd->s_type & CONFIGFS_USET_CREATING)) { |
631d1feba configfs: config ... |
1016 1017 1018 1019 1020 1021 1022 1023 |
ret = configfs_depend_prep(child_sd->s_dentry, target); if (!ret) goto out; /* Child path boo-yah */ } } /* We looped all our children and didn't find target */ |
631d1feba configfs: config ... |
1024 1025 1026 1027 1028 |
ret = -ENOENT; out: return ret; } |
9fb434e75 fs: configfs: Fac... |
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 |
static int configfs_do_depend_item(struct dentry *subsys_dentry, struct config_item *target) { struct configfs_dirent *p; int ret; spin_lock(&configfs_dirent_lock); /* Scan the tree, return 0 if found */ ret = configfs_depend_prep(subsys_dentry, target); if (ret) goto out_unlock_dirent_lock; /* * We are sure that the item is not about to be removed by rmdir(), and * not in the middle of attachment by mkdir(). */ p = target->ci_dentry->d_fsdata; p->s_dependent_count += 1; out_unlock_dirent_lock: spin_unlock(&configfs_dirent_lock); return ret; } |
9a70adfff fs: configfs: Fac... |
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 |
static inline struct configfs_dirent * configfs_find_subsys_dentry(struct configfs_dirent *root_sd, struct config_item *subsys_item) { struct configfs_dirent *p; struct configfs_dirent *ret = NULL; list_for_each_entry(p, &root_sd->s_children, s_sibling) { if (p->s_type & CONFIGFS_DIR && p->s_element == subsys_item) { ret = p; break; } } return ret; } |
631d1feba configfs: config ... |
1070 1071 1072 1073 |
int configfs_depend_item(struct configfs_subsystem *subsys, struct config_item *target) { int ret; |
9a70adfff fs: configfs: Fac... |
1074 |
struct configfs_dirent *subsys_sd; |
631d1feba configfs: config ... |
1075 |
struct config_item *s_item = &subsys->su_group.cg_item; |
b7c177fcd configfs: kill co... |
1076 |
struct dentry *root; |
631d1feba configfs: config ... |
1077 1078 1079 1080 1081 |
/* * Pin the configfs filesystem. This means we can safely access * the root of the configfs filesystem. */ |
2a152ad3a make configfs_pin... |
1082 1083 1084 |
root = configfs_pin_fs(); if (IS_ERR(root)) return PTR_ERR(root); |
631d1feba configfs: config ... |
1085 1086 1087 1088 1089 1090 |
/* * Next, lock the root directory. We're going to check that the * subsystem is really registered, and so we need to lock out * configfs_[un]register_subsystem(). */ |
5955102c9 wrappers for ->i_... |
1091 |
inode_lock(d_inode(root)); |
631d1feba configfs: config ... |
1092 |
|
9a70adfff fs: configfs: Fac... |
1093 |
subsys_sd = configfs_find_subsys_dentry(root->d_fsdata, s_item); |
631d1feba configfs: config ... |
1094 1095 1096 1097 1098 1099 |
if (!subsys_sd) { ret = -ENOENT; goto out_unlock_fs; } /* Ok, now we can trust subsys/s_item */ |
9fb434e75 fs: configfs: Fac... |
1100 |
ret = configfs_do_depend_item(subsys_sd->s_dentry, target); |
631d1feba configfs: config ... |
1101 |
|
631d1feba configfs: config ... |
1102 |
out_unlock_fs: |
5955102c9 wrappers for ->i_... |
1103 |
inode_unlock(d_inode(root)); |
631d1feba configfs: config ... |
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 |
/* * If we succeeded, the fs is pinned via other methods. If not, * we're done with it anyway. So release_fs() is always right. */ configfs_release_fs(); return ret; } EXPORT_SYMBOL(configfs_depend_item); /* * Release the dependent linkage. This is much simpler than * configfs_depend_item() because we know that that the client driver is * pinned, thus the subsystem is pinned, and therefore configfs is pinned. */ |
9a9e3415e fs: configfs: Dro... |
1120 |
void configfs_undepend_item(struct config_item *target) |
631d1feba configfs: config ... |
1121 1122 1123 1124 |
{ struct configfs_dirent *sd; /* |
420118caa configfs: Rework ... |
1125 1126 |
* Since we can trust everything is pinned, we just need * configfs_dirent_lock. |
631d1feba configfs: config ... |
1127 |
*/ |
420118caa configfs: Rework ... |
1128 |
spin_lock(&configfs_dirent_lock); |
631d1feba configfs: config ... |
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 |
sd = target->ci_dentry->d_fsdata; BUG_ON(sd->s_dependent_count < 1); sd->s_dependent_count -= 1; /* * After this unlock, we cannot trust the item to stay alive! * DO NOT REFERENCE item after this unlock. */ |
420118caa configfs: Rework ... |
1139 |
spin_unlock(&configfs_dirent_lock); |
631d1feba configfs: config ... |
1140 1141 |
} EXPORT_SYMBOL(configfs_undepend_item); |
7063fbf22 [PATCH] configfs:... |
1142 |
|
d79d75b5c fs: configfs: Add... |
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 1185 |
/* * caller_subsys is a caller's subsystem not target's. This is used to * determine if we should lock root and check subsys or not. When we are * in the same subsystem as our target there is no need to do locking as * we know that subsys is valid and is not unregistered during this function * as we are called from callback of one of his children and VFS holds a lock * on some inode. Otherwise we have to lock our root to ensure that target's * subsystem it is not unregistered during this function. */ int configfs_depend_item_unlocked(struct configfs_subsystem *caller_subsys, struct config_item *target) { struct configfs_subsystem *target_subsys; struct config_group *root, *parent; struct configfs_dirent *subsys_sd; int ret = -ENOENT; /* Disallow this function for configfs root */ if (configfs_is_root(target)) return -EINVAL; parent = target->ci_group; /* * This may happen when someone is trying to depend root * directory of some subsystem */ if (configfs_is_root(&parent->cg_item)) { target_subsys = to_configfs_subsystem(to_config_group(target)); root = parent; } else { target_subsys = parent->cg_subsys; /* Find a cofnigfs root as we may need it for locking */ for (root = parent; !configfs_is_root(&root->cg_item); root = root->cg_item.ci_group) ; } if (target_subsys != caller_subsys) { /* * We are in other configfs subsystem, so we have to do * additional locking to prevent other subsystem from being * unregistered */ |
5955102c9 wrappers for ->i_... |
1186 |
inode_lock(d_inode(root->cg_item.ci_dentry)); |
d79d75b5c fs: configfs: Add... |
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 |
/* * As we are trying to depend item from other subsystem * we have to check if this subsystem is still registered */ subsys_sd = configfs_find_subsys_dentry( root->cg_item.ci_dentry->d_fsdata, &target_subsys->su_group.cg_item); if (!subsys_sd) goto out_root_unlock; } else { subsys_sd = target_subsys->su_group.cg_item.ci_dentry->d_fsdata; } /* Now we can execute core of depend item */ ret = configfs_do_depend_item(subsys_sd->s_dentry, target); if (target_subsys != caller_subsys) out_root_unlock: /* * We were called from subsystem other than our target so we * took some locks so now it's time to release them */ |
5955102c9 wrappers for ->i_... |
1210 |
inode_unlock(d_inode(root->cg_item.ci_dentry)); |
d79d75b5c fs: configfs: Add... |
1211 1212 1213 1214 |
return ret; } EXPORT_SYMBOL(configfs_depend_item_unlocked); |
18bb1db3e switch vfs_mkdir(... |
1215 |
static int configfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
7063fbf22 [PATCH] configfs:... |
1216 |
{ |
a6795e9eb configfs: Allow -... |
1217 1218 1219 1220 |
int ret = 0; int module_got = 0; struct config_group *group = NULL; struct config_item *item = NULL; |
7063fbf22 [PATCH] configfs:... |
1221 1222 1223 1224 |
struct config_item *parent_item; struct configfs_subsystem *subsys; struct configfs_dirent *sd; struct config_item_type *type; |
70526b674 [PATCH] configfs:... |
1225 |
struct module *subsys_owner = NULL, *new_item_owner = NULL; |
7063fbf22 [PATCH] configfs:... |
1226 |
char *name; |
7063fbf22 [PATCH] configfs:... |
1227 |
sd = dentry->d_parent->d_fsdata; |
2a109f2a4 [PATCH] configfs:... |
1228 1229 1230 1231 1232 1233 1234 1235 1236 |
/* * Fake invisibility if dir belongs to a group/default groups hierarchy * being attached */ if (!configfs_dirent_is_ready(sd)) { ret = -ENOENT; goto out; } |
84efad1a5 configfs: Fix a r... |
1237 1238 1239 1240 |
if (!(sd->s_type & CONFIGFS_USET_DIR)) { ret = -EPERM; goto out; } |
7063fbf22 [PATCH] configfs:... |
1241 |
|
84efad1a5 configfs: Fix a r... |
1242 |
/* Get a working ref for the duration of this function */ |
7063fbf22 [PATCH] configfs:... |
1243 1244 1245 1246 1247 1248 1249 1250 |
parent_item = configfs_get_config_item(dentry->d_parent); type = parent_item->ci_type; subsys = to_config_group(parent_item)->cg_subsys; BUG_ON(!subsys); if (!type || !type->ct_group_ops || (!type->ct_group_ops->make_group && !type->ct_group_ops->make_item)) { |
84efad1a5 configfs: Fix a r... |
1251 1252 |
ret = -EPERM; /* Lack-of-mkdir returns -EPERM */ goto out_put; |
7063fbf22 [PATCH] configfs:... |
1253 |
} |
70526b674 [PATCH] configfs:... |
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
/* * The subsystem may belong to a different module than the item * being created. We don't want to safely pin the new item but * fail to pin the subsystem it sits under. */ if (!subsys->su_group.cg_item.ci_type) { ret = -EINVAL; goto out_put; } subsys_owner = subsys->su_group.cg_item.ci_type->ct_owner; if (!try_module_get(subsys_owner)) { ret = -EINVAL; goto out_put; } |
7063fbf22 [PATCH] configfs:... |
1268 1269 |
name = kmalloc(dentry->d_name.len + 1, GFP_KERNEL); if (!name) { |
84efad1a5 configfs: Fix a r... |
1270 |
ret = -ENOMEM; |
70526b674 [PATCH] configfs:... |
1271 |
goto out_subsys_put; |
7063fbf22 [PATCH] configfs:... |
1272 |
} |
84efad1a5 configfs: Fix a r... |
1273 |
|
7063fbf22 [PATCH] configfs:... |
1274 |
snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name); |
e6bd07aee configfs: Convert... |
1275 |
mutex_lock(&subsys->su_mutex); |
7063fbf22 [PATCH] configfs:... |
1276 |
if (type->ct_group_ops->make_group) { |
f89ab8619 Revert "configfs:... |
1277 |
group = type->ct_group_ops->make_group(to_config_group(parent_item), name); |
a6795e9eb configfs: Allow -... |
1278 1279 1280 |
if (!group) group = ERR_PTR(-ENOMEM); if (!IS_ERR(group)) { |
7063fbf22 [PATCH] configfs:... |
1281 1282 |
link_group(to_config_group(parent_item), group); item = &group->cg_item; |
a6795e9eb configfs: Allow -... |
1283 1284 |
} else ret = PTR_ERR(group); |
7063fbf22 [PATCH] configfs:... |
1285 |
} else { |
f89ab8619 Revert "configfs:... |
1286 |
item = type->ct_group_ops->make_item(to_config_group(parent_item), name); |
a6795e9eb configfs: Allow -... |
1287 1288 1289 |
if (!item) item = ERR_PTR(-ENOMEM); if (!IS_ERR(item)) |
7063fbf22 [PATCH] configfs:... |
1290 |
link_obj(parent_item, item); |
a6795e9eb configfs: Allow -... |
1291 1292 |
else ret = PTR_ERR(item); |
7063fbf22 [PATCH] configfs:... |
1293 |
} |
e6bd07aee configfs: Convert... |
1294 |
mutex_unlock(&subsys->su_mutex); |
7063fbf22 [PATCH] configfs:... |
1295 1296 |
kfree(name); |
a6795e9eb configfs: Allow -... |
1297 |
if (ret) { |
eed7a0db4 configfs: configf... |
1298 |
/* |
dacdd0e04 [PATCH] configfs:... |
1299 |
* If ret != 0, then link_obj() was never called. |
eed7a0db4 configfs: configf... |
1300 1301 |
* There are no extra references to clean up. */ |
70526b674 [PATCH] configfs:... |
1302 |
goto out_subsys_put; |
7063fbf22 [PATCH] configfs:... |
1303 |
} |
eed7a0db4 configfs: configf... |
1304 1305 1306 1307 |
/* * link_obj() has been called (via link_group() for groups). * From here on out, errors must clean that up. */ |
7063fbf22 [PATCH] configfs:... |
1308 |
type = item->ci_type; |
eed7a0db4 configfs: configf... |
1309 1310 1311 1312 |
if (!type) { ret = -EINVAL; goto out_unlink; } |
7063fbf22 [PATCH] configfs:... |
1313 |
|
70526b674 [PATCH] configfs:... |
1314 1315 |
new_item_owner = type->ct_owner; if (!try_module_get(new_item_owner)) { |
eed7a0db4 configfs: configf... |
1316 1317 1318 |
ret = -EINVAL; goto out_unlink; } |
7063fbf22 [PATCH] configfs:... |
1319 |
|
eed7a0db4 configfs: configf... |
1320 1321 1322 1323 1324 1325 |
/* * I hate doing it this way, but if there is * an error, module_put() probably should * happen after any cleanup. */ module_got = 1; |
6d8344bae configfs: Fix fai... |
1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 |
/* * Make racing rmdir() fail if it did not tag parent with * CONFIGFS_USET_DROPPING * Note: if CONFIGFS_USET_DROPPING is already set, attach_group() will * fail and let rmdir() terminate correctly */ spin_lock(&configfs_dirent_lock); /* This will make configfs_detach_prep() fail */ sd->s_type |= CONFIGFS_USET_IN_MKDIR; spin_unlock(&configfs_dirent_lock); |
eed7a0db4 configfs: configf... |
1336 1337 1338 1339 |
if (group) ret = configfs_attach_group(parent_item, item, dentry); else ret = configfs_attach_item(parent_item, item, dentry); |
6d8344bae configfs: Fix fai... |
1340 1341 |
spin_lock(&configfs_dirent_lock); sd->s_type &= ~CONFIGFS_USET_IN_MKDIR; |
2a109f2a4 [PATCH] configfs:... |
1342 1343 |
if (!ret) configfs_dir_set_ready(dentry->d_fsdata); |
6d8344bae configfs: Fix fai... |
1344 |
spin_unlock(&configfs_dirent_lock); |
eed7a0db4 configfs: configf... |
1345 1346 1347 |
out_unlink: if (ret) { /* Tear down everything we built up */ |
e6bd07aee configfs: Convert... |
1348 |
mutex_lock(&subsys->su_mutex); |
299894cc9 configfs: accessi... |
1349 1350 |
client_disconnect_notify(parent_item, item); |
eed7a0db4 configfs: configf... |
1351 1352 1353 1354 1355 |
if (group) unlink_group(group); else unlink_obj(item); client_drop_item(parent_item, item); |
299894cc9 configfs: accessi... |
1356 |
|
e6bd07aee configfs: Convert... |
1357 |
mutex_unlock(&subsys->su_mutex); |
eed7a0db4 configfs: configf... |
1358 1359 |
if (module_got) |
70526b674 [PATCH] configfs:... |
1360 |
module_put(new_item_owner); |
7063fbf22 [PATCH] configfs:... |
1361 |
} |
70526b674 [PATCH] configfs:... |
1362 1363 1364 |
out_subsys_put: if (ret) module_put(subsys_owner); |
84efad1a5 configfs: Fix a r... |
1365 1366 |
out_put: /* |
eed7a0db4 configfs: configf... |
1367 1368 1369 |
* link_obj()/link_group() took a reference from child->parent, * so the parent is safely pinned. We can drop our working * reference. |
84efad1a5 configfs: Fix a r... |
1370 1371 1372 1373 |
*/ config_item_put(parent_item); out: |
7063fbf22 [PATCH] configfs:... |
1374 1375 1376 1377 1378 1379 1380 1381 1382 |
return ret; } static int configfs_rmdir(struct inode *dir, struct dentry *dentry) { struct config_item *parent_item; struct config_item *item; struct configfs_subsystem *subsys; struct configfs_dirent *sd; |
70526b674 [PATCH] configfs:... |
1383 |
struct module *subsys_owner = NULL, *dead_item_owner = NULL; |
7063fbf22 [PATCH] configfs:... |
1384 |
int ret; |
7063fbf22 [PATCH] configfs:... |
1385 1386 1387 |
sd = dentry->d_fsdata; if (sd->s_type & CONFIGFS_USET_DEFAULT) return -EPERM; |
84efad1a5 configfs: Fix a r... |
1388 |
/* Get a working ref until we have the child */ |
7063fbf22 [PATCH] configfs:... |
1389 1390 1391 1392 1393 1394 1395 1396 |
parent_item = configfs_get_config_item(dentry->d_parent); subsys = to_config_group(parent_item)->cg_subsys; BUG_ON(!subsys); if (!parent_item->ci_type) { config_item_put(parent_item); return -EINVAL; } |
70526b674 [PATCH] configfs:... |
1397 1398 1399 |
/* configfs_mkdir() shouldn't have allowed this */ BUG_ON(!subsys->su_group.cg_item.ci_type); subsys_owner = subsys->su_group.cg_item.ci_type->ct_owner; |
9a73d78cd [PATCH] configfs:... |
1400 1401 1402 1403 |
/* * Ensure that no racing symlink() will make detach_prep() fail while * the new link is temporarily attached */ |
6d8344bae configfs: Fix fai... |
1404 |
do { |
48f35b7b7 configfs_detach_p... |
1405 |
struct dentry *wait; |
6d8344bae configfs: Fix fai... |
1406 |
|
de6bf18e9 [PATCH] configfs:... |
1407 1408 |
mutex_lock(&configfs_symlink_mutex); spin_lock(&configfs_dirent_lock); |
420118caa configfs: Rework ... |
1409 1410 1411 1412 1413 1414 1415 |
/* * Here's where we check for dependents. We're protected by * configfs_dirent_lock. * If no dependent, atomically tag the item as dropping. */ ret = sd->s_dependent_count ? -EBUSY : 0; if (!ret) { |
48f35b7b7 configfs_detach_p... |
1416 |
ret = configfs_detach_prep(dentry, &wait); |
420118caa configfs: Rework ... |
1417 1418 1419 |
if (ret) configfs_detach_rollback(dentry); } |
de6bf18e9 [PATCH] configfs:... |
1420 1421 1422 1423 |
spin_unlock(&configfs_dirent_lock); mutex_unlock(&configfs_symlink_mutex); if (ret) { |
6d8344bae configfs: Fix fai... |
1424 1425 1426 1427 1428 1429 |
if (ret != -EAGAIN) { config_item_put(parent_item); return ret; } /* Wait until the racing operation terminates */ |
48f35b7b7 configfs_detach_p... |
1430 1431 1432 |
inode_lock(d_inode(wait)); inode_unlock(d_inode(wait)); dput(wait); |
6d8344bae configfs: Fix fai... |
1433 1434 |
} } while (ret == -EAGAIN); |
7063fbf22 [PATCH] configfs:... |
1435 |
|
84efad1a5 configfs: Fix a r... |
1436 |
/* Get a working ref for the duration of this function */ |
7063fbf22 [PATCH] configfs:... |
1437 1438 1439 1440 1441 1442 |
item = configfs_get_config_item(dentry); /* Drop reference from above, item already holds one. */ config_item_put(parent_item); if (item->ci_type) |
70526b674 [PATCH] configfs:... |
1443 |
dead_item_owner = item->ci_type->ct_owner; |
7063fbf22 [PATCH] configfs:... |
1444 1445 1446 |
if (sd->s_type & CONFIGFS_USET_DIR) { configfs_detach_group(item); |
e6bd07aee configfs: Convert... |
1447 |
mutex_lock(&subsys->su_mutex); |
299894cc9 configfs: accessi... |
1448 |
client_disconnect_notify(parent_item, item); |
7063fbf22 [PATCH] configfs:... |
1449 1450 1451 |
unlink_group(to_config_group(item)); } else { configfs_detach_item(item); |
e6bd07aee configfs: Convert... |
1452 |
mutex_lock(&subsys->su_mutex); |
299894cc9 configfs: accessi... |
1453 |
client_disconnect_notify(parent_item, item); |
7063fbf22 [PATCH] configfs:... |
1454 1455 1456 1457 |
unlink_obj(item); } client_drop_item(parent_item, item); |
e6bd07aee configfs: Convert... |
1458 |
mutex_unlock(&subsys->su_mutex); |
7063fbf22 [PATCH] configfs:... |
1459 1460 1461 |
/* Drop our reference from above */ config_item_put(item); |
70526b674 [PATCH] configfs:... |
1462 1463 |
module_put(dead_item_owner); module_put(subsys_owner); |
7063fbf22 [PATCH] configfs:... |
1464 1465 1466 |
return 0; } |
754661f14 [PATCH] mark stru... |
1467 |
const struct inode_operations configfs_dir_inode_operations = { |
7063fbf22 [PATCH] configfs:... |
1468 1469 1470 1471 1472 |
.mkdir = configfs_mkdir, .rmdir = configfs_rmdir, .symlink = configfs_symlink, .unlink = configfs_unlink, .lookup = configfs_lookup, |
3d0f89bb1 configfs: Add per... |
1473 |
.setattr = configfs_setattr, |
7063fbf22 [PATCH] configfs:... |
1474 |
}; |
81d44ed15 configfs: don't b... |
1475 1476 1477 1478 |
const struct inode_operations configfs_root_inode_operations = { .lookup = configfs_lookup, .setattr = configfs_setattr, }; |
7063fbf22 [PATCH] configfs:... |
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 |
#if 0 int configfs_rename_dir(struct config_item * item, const char *new_name) { int error = 0; struct dentry * new_dentry, * parent; if (!strcmp(config_item_name(item), new_name)) return -EINVAL; if (!item->parent) return -EINVAL; down_write(&configfs_rename_sem); parent = item->parent->dentry; |
5955102c9 wrappers for ->i_... |
1493 |
inode_lock(d_inode(parent)); |
7063fbf22 [PATCH] configfs:... |
1494 1495 1496 |
new_dentry = lookup_one_len(new_name, parent, strlen(new_name)); if (!IS_ERR(new_dentry)) { |
2b0143b5c VFS: normal files... |
1497 |
if (d_really_is_negative(new_dentry)) { |
7063fbf22 [PATCH] configfs:... |
1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 |
error = config_item_set_name(item, "%s", new_name); if (!error) { d_add(new_dentry, NULL); d_move(item->dentry, new_dentry); } else d_delete(new_dentry); } else error = -EEXIST; dput(new_dentry); } |
5955102c9 wrappers for ->i_... |
1509 |
inode_unlock(d_inode(parent)); |
7063fbf22 [PATCH] configfs:... |
1510 1511 1512 1513 1514 1515 1516 1517 |
up_write(&configfs_rename_sem); return error; } #endif static int configfs_dir_open(struct inode *inode, struct file *file) { |
867fa491a [PATCH] configfs:... |
1518 |
struct dentry * dentry = file->f_path.dentry; |
7063fbf22 [PATCH] configfs:... |
1519 |
struct configfs_dirent * parent_sd = dentry->d_fsdata; |
2a109f2a4 [PATCH] configfs:... |
1520 |
int err; |
7063fbf22 [PATCH] configfs:... |
1521 |
|
5955102c9 wrappers for ->i_... |
1522 |
inode_lock(d_inode(dentry)); |
2a109f2a4 [PATCH] configfs:... |
1523 1524 1525 1526 1527 1528 |
/* * Fake invisibility if dir belongs to a group/default groups hierarchy * being attached */ err = -ENOENT; if (configfs_dirent_is_ready(parent_sd)) { |
420118caa configfs: Rework ... |
1529 |
file->private_data = configfs_new_dirent(parent_sd, NULL, 0); |
2a109f2a4 [PATCH] configfs:... |
1530 1531 1532 1533 1534 |
if (IS_ERR(file->private_data)) err = PTR_ERR(file->private_data); else err = 0; } |
5955102c9 wrappers for ->i_... |
1535 |
inode_unlock(d_inode(dentry)); |
7063fbf22 [PATCH] configfs:... |
1536 |
|
2a109f2a4 [PATCH] configfs:... |
1537 |
return err; |
7063fbf22 [PATCH] configfs:... |
1538 1539 1540 1541 |
} static int configfs_dir_close(struct inode *inode, struct file *file) { |
867fa491a [PATCH] configfs:... |
1542 |
struct dentry * dentry = file->f_path.dentry; |
7063fbf22 [PATCH] configfs:... |
1543 |
struct configfs_dirent * cursor = file->private_data; |
5955102c9 wrappers for ->i_... |
1544 |
inode_lock(d_inode(dentry)); |
6f6107640 configfs: Introdu... |
1545 |
spin_lock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
1546 |
list_del_init(&cursor->s_sibling); |
6f6107640 configfs: Introdu... |
1547 |
spin_unlock(&configfs_dirent_lock); |
5955102c9 wrappers for ->i_... |
1548 |
inode_unlock(d_inode(dentry)); |
7063fbf22 [PATCH] configfs:... |
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 |
release_configfs_dirent(cursor); return 0; } /* Relationship between s_mode and the DT_xxx types */ static inline unsigned char dt_type(struct configfs_dirent *sd) { return (sd->s_mode >> 12) & 15; } |
52018855e [readdir] convert... |
1560 |
static int configfs_readdir(struct file *file, struct dir_context *ctx) |
7063fbf22 [PATCH] configfs:... |
1561 |
{ |
52018855e [readdir] convert... |
1562 |
struct dentry *dentry = file->f_path.dentry; |
b7c177fcd configfs: kill co... |
1563 |
struct super_block *sb = dentry->d_sb; |
7063fbf22 [PATCH] configfs:... |
1564 |
struct configfs_dirent * parent_sd = dentry->d_fsdata; |
52018855e [readdir] convert... |
1565 |
struct configfs_dirent *cursor = file->private_data; |
7063fbf22 [PATCH] configfs:... |
1566 |
struct list_head *p, *q = &cursor->s_sibling; |
24307aa1e configfs: Fix rac... |
1567 |
ino_t ino = 0; |
7063fbf22 [PATCH] configfs:... |
1568 |
|
52018855e [readdir] convert... |
1569 1570 |
if (!dir_emit_dots(file, ctx)) return 0; |
a01b3007f configfs_readdir(... |
1571 1572 |
spin_lock(&configfs_dirent_lock); if (ctx->pos == 2) |
52018855e [readdir] convert... |
1573 |
list_move(q, &parent_sd->s_children); |
52018855e [readdir] convert... |
1574 1575 1576 1577 1578 1579 1580 1581 1582 |
for (p = q->next; p != &parent_sd->s_children; p = p->next) { struct configfs_dirent *next; const char *name; int len; struct inode *inode = NULL; next = list_entry(p, struct configfs_dirent, s_sibling); if (!next->s_element) continue; |
7063fbf22 [PATCH] configfs:... |
1583 |
|
52018855e [readdir] convert... |
1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 |
/* * We'll have a dentry and an inode for * PINNED items and for open attribute * files. We lock here to prevent a race * with configfs_d_iput() clearing * s_dentry before calling iput(). * * Why do we go to the trouble? If * someone has an attribute file open, * the inode number should match until * they close it. Beyond that, we don't * care. */ |
52018855e [readdir] convert... |
1597 1598 |
dentry = next->s_dentry; if (dentry) |
2b0143b5c VFS: normal files... |
1599 |
inode = d_inode(dentry); |
52018855e [readdir] convert... |
1600 1601 1602 1603 1604 |
if (inode) ino = inode->i_ino; spin_unlock(&configfs_dirent_lock); if (!inode) ino = iunique(sb, 2); |
7063fbf22 [PATCH] configfs:... |
1605 |
|
a01b3007f configfs_readdir(... |
1606 1607 |
name = configfs_get_name(next); len = strlen(name); |
52018855e [readdir] convert... |
1608 1609 |
if (!dir_emit(ctx, name, len, ino, dt_type(next))) return 0; |
7063fbf22 [PATCH] configfs:... |
1610 |
|
52018855e [readdir] convert... |
1611 1612 |
spin_lock(&configfs_dirent_lock); list_move(q, p); |
52018855e [readdir] convert... |
1613 1614 |
p = q; ctx->pos++; |
7063fbf22 [PATCH] configfs:... |
1615 |
} |
a01b3007f configfs_readdir(... |
1616 |
spin_unlock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
1617 1618 |
return 0; } |
965c8e59c lseek: the "whenc... |
1619 |
static loff_t configfs_dir_lseek(struct file *file, loff_t offset, int whence) |
7063fbf22 [PATCH] configfs:... |
1620 |
{ |
867fa491a [PATCH] configfs:... |
1621 |
struct dentry * dentry = file->f_path.dentry; |
7063fbf22 [PATCH] configfs:... |
1622 |
|
965c8e59c lseek: the "whenc... |
1623 |
switch (whence) { |
7063fbf22 [PATCH] configfs:... |
1624 1625 1626 1627 1628 1629 |
case 1: offset += file->f_pos; case 0: if (offset >= 0) break; default: |
7063fbf22 [PATCH] configfs:... |
1630 1631 1632 1633 1634 1635 1636 1637 1638 |
return -EINVAL; } if (offset != file->f_pos) { file->f_pos = offset; if (file->f_pos >= 2) { struct configfs_dirent *sd = dentry->d_fsdata; struct configfs_dirent *cursor = file->private_data; struct list_head *p; loff_t n = file->f_pos - 2; |
6f6107640 configfs: Introdu... |
1639 |
spin_lock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 |
list_del(&cursor->s_sibling); p = sd->s_children.next; while (n && p != &sd->s_children) { struct configfs_dirent *next; next = list_entry(p, struct configfs_dirent, s_sibling); if (next->s_element) n--; p = p->next; } list_add_tail(&cursor->s_sibling, p); |
6f6107640 configfs: Introdu... |
1651 |
spin_unlock(&configfs_dirent_lock); |
7063fbf22 [PATCH] configfs:... |
1652 1653 |
} } |
7063fbf22 [PATCH] configfs:... |
1654 1655 |
return offset; } |
4b6f5d20b [PATCH] Make most... |
1656 |
const struct file_operations configfs_dir_operations = { |
7063fbf22 [PATCH] configfs:... |
1657 1658 1659 1660 |
.open = configfs_dir_open, .release = configfs_dir_close, .llseek = configfs_dir_lseek, .read = generic_read_dir, |
a01b3007f configfs_readdir(... |
1661 |
.iterate_shared = configfs_readdir, |
7063fbf22 [PATCH] configfs:... |
1662 |
}; |
5cf6a51e6 configfs: allow d... |
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 |
/** * configfs_register_group - creates a parent-child relation between two groups * @parent_group: parent group * @group: child group * * link groups, creates dentry for the child and attaches it to the * parent dentry. * * Return: 0 on success, negative errno code on error */ int configfs_register_group(struct config_group *parent_group, struct config_group *group) { struct configfs_subsystem *subsys = parent_group->cg_subsys; struct dentry *parent; int ret; mutex_lock(&subsys->su_mutex); link_group(parent_group, group); mutex_unlock(&subsys->su_mutex); parent = parent_group->cg_item.ci_dentry; |
5955102c9 wrappers for ->i_... |
1685 |
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); |
5cf6a51e6 configfs: allow d... |
1686 1687 1688 1689 1690 1691 |
ret = create_default_group(parent_group, group); if (!ret) { spin_lock(&configfs_dirent_lock); configfs_dir_set_ready(group->cg_item.ci_dentry->d_fsdata); spin_unlock(&configfs_dirent_lock); } |
5955102c9 wrappers for ->i_... |
1692 |
inode_unlock(d_inode(parent)); |
5cf6a51e6 configfs: allow d... |
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 |
return ret; } EXPORT_SYMBOL(configfs_register_group); /** * configfs_unregister_group() - unregisters a child group from its parent * @group: parent group to be unregistered * * Undoes configfs_register_group() */ void configfs_unregister_group(struct config_group *group) { struct configfs_subsystem *subsys = group->cg_subsys; struct dentry *dentry = group->cg_item.ci_dentry; struct dentry *parent = group->cg_item.ci_parent->ci_dentry; |
bc87baee1 configfs: fix reg... |
1708 1709 1710 1711 1712 1713 1714 1715 1716 |
mutex_lock(&subsys->su_mutex); if (!group->cg_item.ci_parent->ci_group) { /* * The parent has already been unlinked and detached * due to a rmdir. */ goto unlink_group; } mutex_unlock(&subsys->su_mutex); |
5955102c9 wrappers for ->i_... |
1717 |
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); |
5cf6a51e6 configfs: allow d... |
1718 1719 1720 1721 1722 1723 1724 1725 |
spin_lock(&configfs_dirent_lock); configfs_detach_prep(dentry, NULL); spin_unlock(&configfs_dirent_lock); configfs_detach_group(&group->cg_item); d_inode(dentry)->i_flags |= S_DEAD; dont_mount(dentry); d_delete(dentry); |
5955102c9 wrappers for ->i_... |
1726 |
inode_unlock(d_inode(parent)); |
5cf6a51e6 configfs: allow d... |
1727 1728 1729 1730 |
dput(dentry); mutex_lock(&subsys->su_mutex); |
bc87baee1 configfs: fix reg... |
1731 |
unlink_group: |
5cf6a51e6 configfs: allow d... |
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 |
unlink_group(group); mutex_unlock(&subsys->su_mutex); } EXPORT_SYMBOL(configfs_unregister_group); /** * configfs_register_default_group() - allocates and registers a child group * @parent_group: parent group * @name: child group name * @item_type: child item type description * * boilerplate to allocate and register a child group with its parent. We need * kzalloc'ed memory because child's default_group is initially empty. * * Return: allocated config group or ERR_PTR() on error */ struct config_group * configfs_register_default_group(struct config_group *parent_group, const char *name, struct config_item_type *item_type) { int ret; struct config_group *group; group = kzalloc(sizeof(*group), GFP_KERNEL); if (!group) return ERR_PTR(-ENOMEM); config_group_init_type_name(group, name, item_type); ret = configfs_register_group(parent_group, group); if (ret) { kfree(group); return ERR_PTR(ret); } return group; } EXPORT_SYMBOL(configfs_register_default_group); /** * configfs_unregister_default_group() - unregisters and frees a child group * @group: the group to act on */ void configfs_unregister_default_group(struct config_group *group) { configfs_unregister_group(group); kfree(group); } EXPORT_SYMBOL(configfs_unregister_default_group); |
7063fbf22 [PATCH] configfs:... |
1780 1781 1782 1783 |
int configfs_register_subsystem(struct configfs_subsystem *subsys) { int err; struct config_group *group = &subsys->su_group; |
7063fbf22 [PATCH] configfs:... |
1784 |
struct dentry *dentry; |
b7c177fcd configfs: kill co... |
1785 |
struct dentry *root; |
7063fbf22 [PATCH] configfs:... |
1786 |
struct configfs_dirent *sd; |
2a152ad3a make configfs_pin... |
1787 1788 1789 |
root = configfs_pin_fs(); if (IS_ERR(root)) return PTR_ERR(root); |
7063fbf22 [PATCH] configfs:... |
1790 1791 1792 |
if (!group->cg_item.ci_name) group->cg_item.ci_name = group->cg_item.ci_namebuf; |
b7c177fcd configfs: kill co... |
1793 |
sd = root->d_fsdata; |
7063fbf22 [PATCH] configfs:... |
1794 |
link_group(to_config_group(sd->s_element), group); |
5955102c9 wrappers for ->i_... |
1795 |
inode_lock_nested(d_inode(root), I_MUTEX_PARENT); |
7063fbf22 [PATCH] configfs:... |
1796 |
|
7063fbf22 [PATCH] configfs:... |
1797 |
err = -ENOMEM; |
ec193cf5a configfs: don't o... |
1798 |
dentry = d_alloc_name(root, group->cg_item.ci_name); |
afdf04ea0 configfs: add mis... |
1799 1800 |
if (dentry) { d_add(dentry, NULL); |
7063fbf22 [PATCH] configfs:... |
1801 |
|
afdf04ea0 configfs: add mis... |
1802 1803 1804 |
err = configfs_attach_group(sd->s_element, &group->cg_item, dentry); if (err) { |
2b0143b5c VFS: normal files... |
1805 |
BUG_ON(d_inode(dentry)); |
df7f99670 configfs: Don't t... |
1806 |
d_drop(dentry); |
afdf04ea0 configfs: add mis... |
1807 |
dput(dentry); |
2a109f2a4 [PATCH] configfs:... |
1808 1809 1810 1811 |
} else { spin_lock(&configfs_dirent_lock); configfs_dir_set_ready(dentry->d_fsdata); spin_unlock(&configfs_dirent_lock); |
afdf04ea0 configfs: add mis... |
1812 1813 |
} } |
7063fbf22 [PATCH] configfs:... |
1814 |
|
5955102c9 wrappers for ->i_... |
1815 |
inode_unlock(d_inode(root)); |
7063fbf22 [PATCH] configfs:... |
1816 |
|
afdf04ea0 configfs: add mis... |
1817 1818 1819 |
if (err) { unlink_group(group); configfs_release_fs(); |
7063fbf22 [PATCH] configfs:... |
1820 1821 1822 1823 1824 1825 1826 1827 1828 |
} return err; } void configfs_unregister_subsystem(struct configfs_subsystem *subsys) { struct config_group *group = &subsys->su_group; struct dentry *dentry = group->cg_item.ci_dentry; |
b7c177fcd configfs: kill co... |
1829 |
struct dentry *root = dentry->d_sb->s_root; |
7063fbf22 [PATCH] configfs:... |
1830 |
|
b7c177fcd configfs: kill co... |
1831 |
if (dentry->d_parent != root) { |
1d88aa441 fs/configfs: use ... |
1832 1833 |
pr_err("Tried to unregister non-subsystem! "); |
7063fbf22 [PATCH] configfs:... |
1834 1835 |
return; } |
5955102c9 wrappers for ->i_... |
1836 |
inode_lock_nested(d_inode(root), |
55ed16029 configfs: mutex_l... |
1837 |
I_MUTEX_PARENT); |
5955102c9 wrappers for ->i_... |
1838 |
inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); |
9a73d78cd [PATCH] configfs:... |
1839 |
mutex_lock(&configfs_symlink_mutex); |
b3e76af87 configfs: Fix dea... |
1840 |
spin_lock(&configfs_dirent_lock); |
6d8344bae configfs: Fix fai... |
1841 |
if (configfs_detach_prep(dentry, NULL)) { |
1d88aa441 fs/configfs: use ... |
1842 1843 |
pr_err("Tried to unregister non-empty subsystem! "); |
7063fbf22 [PATCH] configfs:... |
1844 |
} |
b3e76af87 configfs: Fix dea... |
1845 |
spin_unlock(&configfs_dirent_lock); |
9a73d78cd [PATCH] configfs:... |
1846 |
mutex_unlock(&configfs_symlink_mutex); |
7063fbf22 [PATCH] configfs:... |
1847 |
configfs_detach_group(&group->cg_item); |
2b0143b5c VFS: normal files... |
1848 |
d_inode(dentry)->i_flags |= S_DEAD; |
d83c49f3e Fix the regressio... |
1849 |
dont_mount(dentry); |
5955102c9 wrappers for ->i_... |
1850 |
inode_unlock(d_inode(dentry)); |
7063fbf22 [PATCH] configfs:... |
1851 1852 |
d_delete(dentry); |
5955102c9 wrappers for ->i_... |
1853 |
inode_unlock(d_inode(root)); |
7063fbf22 [PATCH] configfs:... |
1854 1855 1856 1857 1858 1859 1860 1861 1862 |
dput(dentry); unlink_group(group); configfs_release_fs(); } EXPORT_SYMBOL(configfs_register_subsystem); EXPORT_SYMBOL(configfs_unregister_subsystem); |