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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/libfs.c | |
3 | * Library for filesystems writers. | |
4 | */ | |
5 | ||
630d9c47 | 6 | #include <linux/export.h> |
1da177e4 | 7 | #include <linux/pagemap.h> |
5a0e3ad6 | 8 | #include <linux/slab.h> |
1da177e4 LT |
9 | #include <linux/mount.h> |
10 | #include <linux/vfs.h> | |
7bb46a67 | 11 | #include <linux/quotaops.h> |
7cf34c76 | 12 | #include <linux/mutex.h> |
87dc800b | 13 | #include <linux/namei.h> |
2596110a | 14 | #include <linux/exportfs.h> |
d5aacad5 | 15 | #include <linux/writeback.h> |
ff01bb48 | 16 | #include <linux/buffer_head.h> /* sync_mapping_buffers */ |
7cf34c76 | 17 | |
1da177e4 LT |
18 | #include <asm/uaccess.h> |
19 | ||
a4464dbc AV |
20 | #include "internal.h" |
21 | ||
da502956 NP |
22 | static inline int simple_positive(struct dentry *dentry) |
23 | { | |
24 | return dentry->d_inode && !d_unhashed(dentry); | |
25 | } | |
26 | ||
1da177e4 LT |
27 | int simple_getattr(struct vfsmount *mnt, struct dentry *dentry, |
28 | struct kstat *stat) | |
29 | { | |
30 | struct inode *inode = dentry->d_inode; | |
31 | generic_fillattr(inode, stat); | |
32 | stat->blocks = inode->i_mapping->nrpages << (PAGE_CACHE_SHIFT - 9); | |
33 | return 0; | |
34 | } | |
12f38872 | 35 | EXPORT_SYMBOL(simple_getattr); |
1da177e4 | 36 | |
726c3342 | 37 | int simple_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 38 | { |
726c3342 | 39 | buf->f_type = dentry->d_sb->s_magic; |
1da177e4 LT |
40 | buf->f_bsize = PAGE_CACHE_SIZE; |
41 | buf->f_namelen = NAME_MAX; | |
42 | return 0; | |
43 | } | |
12f38872 | 44 | EXPORT_SYMBOL(simple_statfs); |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Retaining negative dentries for an in-memory filesystem just wastes | |
48 | * memory and lookup time: arrange for them to be deleted immediately. | |
49 | */ | |
fe15ce44 | 50 | static int simple_delete_dentry(const struct dentry *dentry) |
1da177e4 LT |
51 | { |
52 | return 1; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Lookup the data. This is trivial - if the dentry didn't already | |
57 | * exist, we know it is negative. Set d_op to delete negative dentries. | |
58 | */ | |
00cd8dd3 | 59 | struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
1da177e4 | 60 | { |
3ba13d17 | 61 | static const struct dentry_operations simple_dentry_operations = { |
1da177e4 LT |
62 | .d_delete = simple_delete_dentry, |
63 | }; | |
64 | ||
65 | if (dentry->d_name.len > NAME_MAX) | |
66 | return ERR_PTR(-ENAMETOOLONG); | |
74931da7 AV |
67 | if (!dentry->d_sb->s_d_op) |
68 | d_set_d_op(dentry, &simple_dentry_operations); | |
1da177e4 LT |
69 | d_add(dentry, NULL); |
70 | return NULL; | |
71 | } | |
12f38872 | 72 | EXPORT_SYMBOL(simple_lookup); |
1da177e4 | 73 | |
1da177e4 LT |
74 | int dcache_dir_open(struct inode *inode, struct file *file) |
75 | { | |
26fe5750 | 76 | static struct qstr cursor_name = QSTR_INIT(".", 1); |
1da177e4 | 77 | |
0f7fc9e4 | 78 | file->private_data = d_alloc(file->f_path.dentry, &cursor_name); |
1da177e4 LT |
79 | |
80 | return file->private_data ? 0 : -ENOMEM; | |
81 | } | |
12f38872 | 82 | EXPORT_SYMBOL(dcache_dir_open); |
1da177e4 LT |
83 | |
84 | int dcache_dir_close(struct inode *inode, struct file *file) | |
85 | { | |
86 | dput(file->private_data); | |
87 | return 0; | |
88 | } | |
12f38872 | 89 | EXPORT_SYMBOL(dcache_dir_close); |
1da177e4 | 90 | |
965c8e59 | 91 | loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence) |
1da177e4 | 92 | { |
2fd6b7f5 NP |
93 | struct dentry *dentry = file->f_path.dentry; |
94 | mutex_lock(&dentry->d_inode->i_mutex); | |
965c8e59 | 95 | switch (whence) { |
1da177e4 LT |
96 | case 1: |
97 | offset += file->f_pos; | |
98 | case 0: | |
99 | if (offset >= 0) | |
100 | break; | |
101 | default: | |
2fd6b7f5 | 102 | mutex_unlock(&dentry->d_inode->i_mutex); |
1da177e4 LT |
103 | return -EINVAL; |
104 | } | |
105 | if (offset != file->f_pos) { | |
106 | file->f_pos = offset; | |
107 | if (file->f_pos >= 2) { | |
108 | struct list_head *p; | |
109 | struct dentry *cursor = file->private_data; | |
110 | loff_t n = file->f_pos - 2; | |
111 | ||
2fd6b7f5 NP |
112 | spin_lock(&dentry->d_lock); |
113 | /* d_lock not required for cursor */ | |
5160ee6f | 114 | list_del(&cursor->d_u.d_child); |
2fd6b7f5 NP |
115 | p = dentry->d_subdirs.next; |
116 | while (n && p != &dentry->d_subdirs) { | |
1da177e4 | 117 | struct dentry *next; |
5160ee6f | 118 | next = list_entry(p, struct dentry, d_u.d_child); |
2fd6b7f5 | 119 | spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED); |
da502956 | 120 | if (simple_positive(next)) |
1da177e4 | 121 | n--; |
da502956 | 122 | spin_unlock(&next->d_lock); |
1da177e4 LT |
123 | p = p->next; |
124 | } | |
5160ee6f | 125 | list_add_tail(&cursor->d_u.d_child, p); |
2fd6b7f5 | 126 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
127 | } |
128 | } | |
2fd6b7f5 | 129 | mutex_unlock(&dentry->d_inode->i_mutex); |
1da177e4 LT |
130 | return offset; |
131 | } | |
12f38872 | 132 | EXPORT_SYMBOL(dcache_dir_lseek); |
1da177e4 LT |
133 | |
134 | /* Relationship between i_mode and the DT_xxx types */ | |
135 | static inline unsigned char dt_type(struct inode *inode) | |
136 | { | |
137 | return (inode->i_mode >> 12) & 15; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Directory is locked and all positive dentries in it are safe, since | |
142 | * for ramfs-type trees they can't go away without unlink() or rmdir(), | |
143 | * both impossible due to the lock on directory. | |
144 | */ | |
145 | ||
5f99f4e7 | 146 | int dcache_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 147 | { |
5f99f4e7 AV |
148 | struct dentry *dentry = file->f_path.dentry; |
149 | struct dentry *cursor = file->private_data; | |
5160ee6f | 150 | struct list_head *p, *q = &cursor->d_u.d_child; |
1da177e4 | 151 | |
5f99f4e7 AV |
152 | if (!dir_emit_dots(file, ctx)) |
153 | return 0; | |
154 | spin_lock(&dentry->d_lock); | |
155 | if (ctx->pos == 2) | |
156 | list_move(q, &dentry->d_subdirs); | |
157 | ||
158 | for (p = q->next; p != &dentry->d_subdirs; p = p->next) { | |
159 | struct dentry *next = list_entry(p, struct dentry, d_u.d_child); | |
160 | spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED); | |
161 | if (!simple_positive(next)) { | |
162 | spin_unlock(&next->d_lock); | |
163 | continue; | |
164 | } | |
1da177e4 | 165 | |
5f99f4e7 AV |
166 | spin_unlock(&next->d_lock); |
167 | spin_unlock(&dentry->d_lock); | |
168 | if (!dir_emit(ctx, next->d_name.name, next->d_name.len, | |
169 | next->d_inode->i_ino, dt_type(next->d_inode))) | |
170 | return 0; | |
171 | spin_lock(&dentry->d_lock); | |
172 | spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED); | |
173 | /* next is still alive */ | |
174 | list_move(q, p); | |
175 | spin_unlock(&next->d_lock); | |
176 | p = q; | |
177 | ctx->pos++; | |
1da177e4 | 178 | } |
5f99f4e7 | 179 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
180 | return 0; |
181 | } | |
12f38872 | 182 | EXPORT_SYMBOL(dcache_readdir); |
1da177e4 LT |
183 | |
184 | ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t *ppos) | |
185 | { | |
186 | return -EISDIR; | |
187 | } | |
12f38872 | 188 | EXPORT_SYMBOL(generic_read_dir); |
1da177e4 | 189 | |
4b6f5d20 | 190 | const struct file_operations simple_dir_operations = { |
1da177e4 LT |
191 | .open = dcache_dir_open, |
192 | .release = dcache_dir_close, | |
193 | .llseek = dcache_dir_lseek, | |
194 | .read = generic_read_dir, | |
5f99f4e7 | 195 | .iterate = dcache_readdir, |
1b061d92 | 196 | .fsync = noop_fsync, |
1da177e4 | 197 | }; |
12f38872 | 198 | EXPORT_SYMBOL(simple_dir_operations); |
1da177e4 | 199 | |
92e1d5be | 200 | const struct inode_operations simple_dir_inode_operations = { |
1da177e4 LT |
201 | .lookup = simple_lookup, |
202 | }; | |
12f38872 | 203 | EXPORT_SYMBOL(simple_dir_inode_operations); |
1da177e4 | 204 | |
759b9775 HD |
205 | static const struct super_operations simple_super_operations = { |
206 | .statfs = simple_statfs, | |
207 | }; | |
208 | ||
1da177e4 LT |
209 | /* |
210 | * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that | |
211 | * will never be mountable) | |
212 | */ | |
51139ada | 213 | struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name, |
c74a1cbb AV |
214 | const struct super_operations *ops, |
215 | const struct dentry_operations *dops, unsigned long magic) | |
1da177e4 | 216 | { |
9249e17f | 217 | struct super_block *s; |
1da177e4 LT |
218 | struct dentry *dentry; |
219 | struct inode *root; | |
26fe5750 | 220 | struct qstr d_name = QSTR_INIT(name, strlen(name)); |
1da177e4 | 221 | |
9249e17f | 222 | s = sget(fs_type, NULL, set_anon_super, MS_NOUSER, NULL); |
1da177e4 | 223 | if (IS_ERR(s)) |
51139ada | 224 | return ERR_CAST(s); |
1da177e4 | 225 | |
89a4eb4b | 226 | s->s_maxbytes = MAX_LFS_FILESIZE; |
3971e1a9 AN |
227 | s->s_blocksize = PAGE_SIZE; |
228 | s->s_blocksize_bits = PAGE_SHIFT; | |
1da177e4 | 229 | s->s_magic = magic; |
759b9775 | 230 | s->s_op = ops ? ops : &simple_super_operations; |
1da177e4 LT |
231 | s->s_time_gran = 1; |
232 | root = new_inode(s); | |
233 | if (!root) | |
234 | goto Enomem; | |
1a1c9bb4 JL |
235 | /* |
236 | * since this is the first inode, make it number 1. New inodes created | |
237 | * after this must take care not to collide with it (by passing | |
238 | * max_reserved of 1 to iunique). | |
239 | */ | |
240 | root->i_ino = 1; | |
1da177e4 | 241 | root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR; |
1da177e4 | 242 | root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME; |
a4464dbc | 243 | dentry = __d_alloc(s, &d_name); |
1da177e4 LT |
244 | if (!dentry) { |
245 | iput(root); | |
246 | goto Enomem; | |
247 | } | |
1da177e4 LT |
248 | d_instantiate(dentry, root); |
249 | s->s_root = dentry; | |
c74a1cbb | 250 | s->s_d_op = dops; |
1da177e4 | 251 | s->s_flags |= MS_ACTIVE; |
51139ada | 252 | return dget(s->s_root); |
1da177e4 LT |
253 | |
254 | Enomem: | |
6f5bbff9 | 255 | deactivate_locked_super(s); |
51139ada | 256 | return ERR_PTR(-ENOMEM); |
1da177e4 | 257 | } |
12f38872 | 258 | EXPORT_SYMBOL(mount_pseudo); |
1da177e4 | 259 | |
20955e89 SB |
260 | int simple_open(struct inode *inode, struct file *file) |
261 | { | |
262 | if (inode->i_private) | |
263 | file->private_data = inode->i_private; | |
264 | return 0; | |
265 | } | |
12f38872 | 266 | EXPORT_SYMBOL(simple_open); |
20955e89 | 267 | |
1da177e4 LT |
268 | int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
269 | { | |
270 | struct inode *inode = old_dentry->d_inode; | |
271 | ||
272 | inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
d8c76e6f | 273 | inc_nlink(inode); |
7de9c6ee | 274 | ihold(inode); |
1da177e4 LT |
275 | dget(dentry); |
276 | d_instantiate(dentry, inode); | |
277 | return 0; | |
278 | } | |
12f38872 | 279 | EXPORT_SYMBOL(simple_link); |
1da177e4 | 280 | |
1da177e4 LT |
281 | int simple_empty(struct dentry *dentry) |
282 | { | |
283 | struct dentry *child; | |
284 | int ret = 0; | |
285 | ||
2fd6b7f5 | 286 | spin_lock(&dentry->d_lock); |
da502956 NP |
287 | list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) { |
288 | spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); | |
289 | if (simple_positive(child)) { | |
290 | spin_unlock(&child->d_lock); | |
1da177e4 | 291 | goto out; |
da502956 NP |
292 | } |
293 | spin_unlock(&child->d_lock); | |
294 | } | |
1da177e4 LT |
295 | ret = 1; |
296 | out: | |
2fd6b7f5 | 297 | spin_unlock(&dentry->d_lock); |
1da177e4 LT |
298 | return ret; |
299 | } | |
12f38872 | 300 | EXPORT_SYMBOL(simple_empty); |
1da177e4 LT |
301 | |
302 | int simple_unlink(struct inode *dir, struct dentry *dentry) | |
303 | { | |
304 | struct inode *inode = dentry->d_inode; | |
305 | ||
306 | inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
9a53c3a7 | 307 | drop_nlink(inode); |
1da177e4 LT |
308 | dput(dentry); |
309 | return 0; | |
310 | } | |
12f38872 | 311 | EXPORT_SYMBOL(simple_unlink); |
1da177e4 LT |
312 | |
313 | int simple_rmdir(struct inode *dir, struct dentry *dentry) | |
314 | { | |
315 | if (!simple_empty(dentry)) | |
316 | return -ENOTEMPTY; | |
317 | ||
9a53c3a7 | 318 | drop_nlink(dentry->d_inode); |
1da177e4 | 319 | simple_unlink(dir, dentry); |
9a53c3a7 | 320 | drop_nlink(dir); |
1da177e4 LT |
321 | return 0; |
322 | } | |
12f38872 | 323 | EXPORT_SYMBOL(simple_rmdir); |
1da177e4 LT |
324 | |
325 | int simple_rename(struct inode *old_dir, struct dentry *old_dentry, | |
326 | struct inode *new_dir, struct dentry *new_dentry) | |
327 | { | |
328 | struct inode *inode = old_dentry->d_inode; | |
329 | int they_are_dirs = S_ISDIR(old_dentry->d_inode->i_mode); | |
330 | ||
331 | if (!simple_empty(new_dentry)) | |
332 | return -ENOTEMPTY; | |
333 | ||
334 | if (new_dentry->d_inode) { | |
335 | simple_unlink(new_dir, new_dentry); | |
841590ce AV |
336 | if (they_are_dirs) { |
337 | drop_nlink(new_dentry->d_inode); | |
9a53c3a7 | 338 | drop_nlink(old_dir); |
841590ce | 339 | } |
1da177e4 | 340 | } else if (they_are_dirs) { |
9a53c3a7 | 341 | drop_nlink(old_dir); |
d8c76e6f | 342 | inc_nlink(new_dir); |
1da177e4 LT |
343 | } |
344 | ||
345 | old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = | |
346 | new_dir->i_mtime = inode->i_ctime = CURRENT_TIME; | |
347 | ||
348 | return 0; | |
349 | } | |
12f38872 | 350 | EXPORT_SYMBOL(simple_rename); |
1da177e4 | 351 | |
7bb46a67 | 352 | /** |
eef2380c | 353 | * simple_setattr - setattr for simple filesystem |
7bb46a67 | 354 | * @dentry: dentry |
355 | * @iattr: iattr structure | |
356 | * | |
357 | * Returns 0 on success, -error on failure. | |
358 | * | |
eef2380c CH |
359 | * simple_setattr is a simple ->setattr implementation without a proper |
360 | * implementation of size changes. | |
361 | * | |
362 | * It can either be used for in-memory filesystems or special files | |
363 | * on simple regular filesystems. Anything that needs to change on-disk | |
364 | * or wire state on size changes needs its own setattr method. | |
7bb46a67 | 365 | */ |
366 | int simple_setattr(struct dentry *dentry, struct iattr *iattr) | |
367 | { | |
368 | struct inode *inode = dentry->d_inode; | |
369 | int error; | |
370 | ||
371 | error = inode_change_ok(inode, iattr); | |
372 | if (error) | |
373 | return error; | |
374 | ||
2c27c65e CH |
375 | if (iattr->ia_valid & ATTR_SIZE) |
376 | truncate_setsize(inode, iattr->ia_size); | |
6a1a90ad | 377 | setattr_copy(inode, iattr); |
eef2380c CH |
378 | mark_inode_dirty(inode); |
379 | return 0; | |
7bb46a67 | 380 | } |
381 | EXPORT_SYMBOL(simple_setattr); | |
382 | ||
1da177e4 LT |
383 | int simple_readpage(struct file *file, struct page *page) |
384 | { | |
c0d92cbc | 385 | clear_highpage(page); |
1da177e4 LT |
386 | flush_dcache_page(page); |
387 | SetPageUptodate(page); | |
1da177e4 LT |
388 | unlock_page(page); |
389 | return 0; | |
390 | } | |
12f38872 | 391 | EXPORT_SYMBOL(simple_readpage); |
1da177e4 | 392 | |
afddba49 NP |
393 | int simple_write_begin(struct file *file, struct address_space *mapping, |
394 | loff_t pos, unsigned len, unsigned flags, | |
395 | struct page **pagep, void **fsdata) | |
396 | { | |
397 | struct page *page; | |
398 | pgoff_t index; | |
afddba49 NP |
399 | |
400 | index = pos >> PAGE_CACHE_SHIFT; | |
afddba49 | 401 | |
54566b2c | 402 | page = grab_cache_page_write_begin(mapping, index, flags); |
afddba49 NP |
403 | if (!page) |
404 | return -ENOMEM; | |
405 | ||
406 | *pagep = page; | |
407 | ||
193cf4b9 BH |
408 | if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) { |
409 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); | |
410 | ||
411 | zero_user_segments(page, 0, from, from + len, PAGE_CACHE_SIZE); | |
412 | } | |
413 | return 0; | |
afddba49 | 414 | } |
12f38872 | 415 | EXPORT_SYMBOL(simple_write_begin); |
afddba49 | 416 | |
ad2a722f BH |
417 | /** |
418 | * simple_write_end - .write_end helper for non-block-device FSes | |
419 | * @available: See .write_end of address_space_operations | |
420 | * @file: " | |
421 | * @mapping: " | |
422 | * @pos: " | |
423 | * @len: " | |
424 | * @copied: " | |
425 | * @page: " | |
426 | * @fsdata: " | |
427 | * | |
428 | * simple_write_end does the minimum needed for updating a page after writing is | |
429 | * done. It has the same API signature as the .write_end of | |
430 | * address_space_operations vector. So it can just be set onto .write_end for | |
431 | * FSes that don't need any other processing. i_mutex is assumed to be held. | |
432 | * Block based filesystems should use generic_write_end(). | |
433 | * NOTE: Even though i_size might get updated by this function, mark_inode_dirty | |
434 | * is not called, so a filesystem that actually does store data in .write_inode | |
435 | * should extend on what's done here with a call to mark_inode_dirty() in the | |
436 | * case that i_size has changed. | |
437 | */ | |
afddba49 NP |
438 | int simple_write_end(struct file *file, struct address_space *mapping, |
439 | loff_t pos, unsigned len, unsigned copied, | |
440 | struct page *page, void *fsdata) | |
441 | { | |
ad2a722f BH |
442 | struct inode *inode = page->mapping->host; |
443 | loff_t last_pos = pos + copied; | |
afddba49 NP |
444 | |
445 | /* zero the stale part of the page if we did a short copy */ | |
446 | if (copied < len) { | |
ad2a722f BH |
447 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
448 | ||
449 | zero_user(page, from + copied, len - copied); | |
afddba49 NP |
450 | } |
451 | ||
ad2a722f BH |
452 | if (!PageUptodate(page)) |
453 | SetPageUptodate(page); | |
454 | /* | |
455 | * No need to use i_size_read() here, the i_size | |
456 | * cannot change under us because we hold the i_mutex. | |
457 | */ | |
458 | if (last_pos > inode->i_size) | |
459 | i_size_write(inode, last_pos); | |
afddba49 | 460 | |
ad2a722f | 461 | set_page_dirty(page); |
afddba49 NP |
462 | unlock_page(page); |
463 | page_cache_release(page); | |
464 | ||
465 | return copied; | |
466 | } | |
12f38872 | 467 | EXPORT_SYMBOL(simple_write_end); |
afddba49 | 468 | |
1a1c9bb4 JL |
469 | /* |
470 | * the inodes created here are not hashed. If you use iunique to generate | |
471 | * unique inode values later for this filesystem, then you must take care | |
472 | * to pass it an appropriate max_reserved value to avoid collisions. | |
473 | */ | |
7d683a09 RS |
474 | int simple_fill_super(struct super_block *s, unsigned long magic, |
475 | struct tree_descr *files) | |
1da177e4 | 476 | { |
1da177e4 LT |
477 | struct inode *inode; |
478 | struct dentry *root; | |
479 | struct dentry *dentry; | |
480 | int i; | |
481 | ||
482 | s->s_blocksize = PAGE_CACHE_SIZE; | |
483 | s->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
484 | s->s_magic = magic; | |
759b9775 | 485 | s->s_op = &simple_super_operations; |
1da177e4 LT |
486 | s->s_time_gran = 1; |
487 | ||
488 | inode = new_inode(s); | |
489 | if (!inode) | |
490 | return -ENOMEM; | |
1a1c9bb4 JL |
491 | /* |
492 | * because the root inode is 1, the files array must not contain an | |
493 | * entry at index 1 | |
494 | */ | |
495 | inode->i_ino = 1; | |
1da177e4 | 496 | inode->i_mode = S_IFDIR | 0755; |
1da177e4 LT |
497 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
498 | inode->i_op = &simple_dir_inode_operations; | |
499 | inode->i_fop = &simple_dir_operations; | |
bfe86848 | 500 | set_nlink(inode, 2); |
48fde701 AV |
501 | root = d_make_root(inode); |
502 | if (!root) | |
1da177e4 | 503 | return -ENOMEM; |
1da177e4 LT |
504 | for (i = 0; !files->name || files->name[0]; i++, files++) { |
505 | if (!files->name) | |
506 | continue; | |
1a1c9bb4 JL |
507 | |
508 | /* warn if it tries to conflict with the root inode */ | |
509 | if (unlikely(i == 1)) | |
510 | printk(KERN_WARNING "%s: %s passed in a files array" | |
511 | "with an index of 1!\n", __func__, | |
512 | s->s_type->name); | |
513 | ||
1da177e4 LT |
514 | dentry = d_alloc_name(root, files->name); |
515 | if (!dentry) | |
516 | goto out; | |
517 | inode = new_inode(s); | |
32096ea1 KK |
518 | if (!inode) { |
519 | dput(dentry); | |
1da177e4 | 520 | goto out; |
32096ea1 | 521 | } |
1da177e4 | 522 | inode->i_mode = S_IFREG | files->mode; |
1da177e4 LT |
523 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
524 | inode->i_fop = files->ops; | |
525 | inode->i_ino = i; | |
526 | d_add(dentry, inode); | |
527 | } | |
528 | s->s_root = root; | |
529 | return 0; | |
530 | out: | |
531 | d_genocide(root); | |
640946f2 | 532 | shrink_dcache_parent(root); |
1da177e4 LT |
533 | dput(root); |
534 | return -ENOMEM; | |
535 | } | |
12f38872 | 536 | EXPORT_SYMBOL(simple_fill_super); |
1da177e4 LT |
537 | |
538 | static DEFINE_SPINLOCK(pin_fs_lock); | |
539 | ||
1f5ce9e9 | 540 | int simple_pin_fs(struct file_system_type *type, struct vfsmount **mount, int *count) |
1da177e4 LT |
541 | { |
542 | struct vfsmount *mnt = NULL; | |
543 | spin_lock(&pin_fs_lock); | |
544 | if (unlikely(!*mount)) { | |
545 | spin_unlock(&pin_fs_lock); | |
2452992a | 546 | mnt = vfs_kern_mount(type, MS_KERNMOUNT, type->name, NULL); |
1da177e4 LT |
547 | if (IS_ERR(mnt)) |
548 | return PTR_ERR(mnt); | |
549 | spin_lock(&pin_fs_lock); | |
550 | if (!*mount) | |
551 | *mount = mnt; | |
552 | } | |
553 | mntget(*mount); | |
554 | ++*count; | |
555 | spin_unlock(&pin_fs_lock); | |
556 | mntput(mnt); | |
557 | return 0; | |
558 | } | |
12f38872 | 559 | EXPORT_SYMBOL(simple_pin_fs); |
1da177e4 LT |
560 | |
561 | void simple_release_fs(struct vfsmount **mount, int *count) | |
562 | { | |
563 | struct vfsmount *mnt; | |
564 | spin_lock(&pin_fs_lock); | |
565 | mnt = *mount; | |
566 | if (!--*count) | |
567 | *mount = NULL; | |
568 | spin_unlock(&pin_fs_lock); | |
569 | mntput(mnt); | |
570 | } | |
12f38872 | 571 | EXPORT_SYMBOL(simple_release_fs); |
1da177e4 | 572 | |
6d1029b5 AM |
573 | /** |
574 | * simple_read_from_buffer - copy data from the buffer to user space | |
575 | * @to: the user space buffer to read to | |
576 | * @count: the maximum number of bytes to read | |
577 | * @ppos: the current position in the buffer | |
578 | * @from: the buffer to read from | |
579 | * @available: the size of the buffer | |
580 | * | |
581 | * The simple_read_from_buffer() function reads up to @count bytes from the | |
582 | * buffer @from at offset @ppos into the user space address starting at @to. | |
583 | * | |
584 | * On success, the number of bytes read is returned and the offset @ppos is | |
585 | * advanced by this number, or negative value is returned on error. | |
586 | **/ | |
1da177e4 LT |
587 | ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos, |
588 | const void *from, size_t available) | |
589 | { | |
590 | loff_t pos = *ppos; | |
14be2746 SR |
591 | size_t ret; |
592 | ||
1da177e4 LT |
593 | if (pos < 0) |
594 | return -EINVAL; | |
14be2746 | 595 | if (pos >= available || !count) |
1da177e4 LT |
596 | return 0; |
597 | if (count > available - pos) | |
598 | count = available - pos; | |
14be2746 SR |
599 | ret = copy_to_user(to, from + pos, count); |
600 | if (ret == count) | |
1da177e4 | 601 | return -EFAULT; |
14be2746 | 602 | count -= ret; |
1da177e4 LT |
603 | *ppos = pos + count; |
604 | return count; | |
605 | } | |
12f38872 | 606 | EXPORT_SYMBOL(simple_read_from_buffer); |
1da177e4 | 607 | |
6a727b43 JS |
608 | /** |
609 | * simple_write_to_buffer - copy data from user space to the buffer | |
610 | * @to: the buffer to write to | |
611 | * @available: the size of the buffer | |
612 | * @ppos: the current position in the buffer | |
613 | * @from: the user space buffer to read from | |
614 | * @count: the maximum number of bytes to read | |
615 | * | |
616 | * The simple_write_to_buffer() function reads up to @count bytes from the user | |
617 | * space address starting at @from into the buffer @to at offset @ppos. | |
618 | * | |
619 | * On success, the number of bytes written is returned and the offset @ppos is | |
620 | * advanced by this number, or negative value is returned on error. | |
621 | **/ | |
622 | ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, | |
623 | const void __user *from, size_t count) | |
624 | { | |
625 | loff_t pos = *ppos; | |
626 | size_t res; | |
627 | ||
628 | if (pos < 0) | |
629 | return -EINVAL; | |
630 | if (pos >= available || !count) | |
631 | return 0; | |
632 | if (count > available - pos) | |
633 | count = available - pos; | |
634 | res = copy_from_user(to + pos, from, count); | |
635 | if (res == count) | |
636 | return -EFAULT; | |
637 | count -= res; | |
638 | *ppos = pos + count; | |
639 | return count; | |
640 | } | |
12f38872 | 641 | EXPORT_SYMBOL(simple_write_to_buffer); |
6a727b43 | 642 | |
6d1029b5 AM |
643 | /** |
644 | * memory_read_from_buffer - copy data from the buffer | |
645 | * @to: the kernel space buffer to read to | |
646 | * @count: the maximum number of bytes to read | |
647 | * @ppos: the current position in the buffer | |
648 | * @from: the buffer to read from | |
649 | * @available: the size of the buffer | |
650 | * | |
651 | * The memory_read_from_buffer() function reads up to @count bytes from the | |
652 | * buffer @from at offset @ppos into the kernel space address starting at @to. | |
653 | * | |
654 | * On success, the number of bytes read is returned and the offset @ppos is | |
655 | * advanced by this number, or negative value is returned on error. | |
656 | **/ | |
93b07113 AM |
657 | ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, |
658 | const void *from, size_t available) | |
659 | { | |
660 | loff_t pos = *ppos; | |
661 | ||
662 | if (pos < 0) | |
663 | return -EINVAL; | |
664 | if (pos >= available) | |
665 | return 0; | |
666 | if (count > available - pos) | |
667 | count = available - pos; | |
668 | memcpy(to, from + pos, count); | |
669 | *ppos = pos + count; | |
670 | ||
671 | return count; | |
672 | } | |
12f38872 | 673 | EXPORT_SYMBOL(memory_read_from_buffer); |
93b07113 | 674 | |
1da177e4 LT |
675 | /* |
676 | * Transaction based IO. | |
677 | * The file expects a single write which triggers the transaction, and then | |
678 | * possibly a read which collects the result - which is stored in a | |
679 | * file-local buffer. | |
680 | */ | |
76791ab2 IM |
681 | |
682 | void simple_transaction_set(struct file *file, size_t n) | |
683 | { | |
684 | struct simple_transaction_argresp *ar = file->private_data; | |
685 | ||
686 | BUG_ON(n > SIMPLE_TRANSACTION_LIMIT); | |
687 | ||
688 | /* | |
689 | * The barrier ensures that ar->size will really remain zero until | |
690 | * ar->data is ready for reading. | |
691 | */ | |
692 | smp_mb(); | |
693 | ar->size = n; | |
694 | } | |
12f38872 | 695 | EXPORT_SYMBOL(simple_transaction_set); |
76791ab2 | 696 | |
1da177e4 LT |
697 | char *simple_transaction_get(struct file *file, const char __user *buf, size_t size) |
698 | { | |
699 | struct simple_transaction_argresp *ar; | |
700 | static DEFINE_SPINLOCK(simple_transaction_lock); | |
701 | ||
702 | if (size > SIMPLE_TRANSACTION_LIMIT - 1) | |
703 | return ERR_PTR(-EFBIG); | |
704 | ||
705 | ar = (struct simple_transaction_argresp *)get_zeroed_page(GFP_KERNEL); | |
706 | if (!ar) | |
707 | return ERR_PTR(-ENOMEM); | |
708 | ||
709 | spin_lock(&simple_transaction_lock); | |
710 | ||
711 | /* only one write allowed per open */ | |
712 | if (file->private_data) { | |
713 | spin_unlock(&simple_transaction_lock); | |
714 | free_page((unsigned long)ar); | |
715 | return ERR_PTR(-EBUSY); | |
716 | } | |
717 | ||
718 | file->private_data = ar; | |
719 | ||
720 | spin_unlock(&simple_transaction_lock); | |
721 | ||
722 | if (copy_from_user(ar->data, buf, size)) | |
723 | return ERR_PTR(-EFAULT); | |
724 | ||
725 | return ar->data; | |
726 | } | |
12f38872 | 727 | EXPORT_SYMBOL(simple_transaction_get); |
1da177e4 LT |
728 | |
729 | ssize_t simple_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) | |
730 | { | |
731 | struct simple_transaction_argresp *ar = file->private_data; | |
732 | ||
733 | if (!ar) | |
734 | return 0; | |
735 | return simple_read_from_buffer(buf, size, pos, ar->data, ar->size); | |
736 | } | |
12f38872 | 737 | EXPORT_SYMBOL(simple_transaction_read); |
1da177e4 LT |
738 | |
739 | int simple_transaction_release(struct inode *inode, struct file *file) | |
740 | { | |
741 | free_page((unsigned long)file->private_data); | |
742 | return 0; | |
743 | } | |
12f38872 | 744 | EXPORT_SYMBOL(simple_transaction_release); |
1da177e4 | 745 | |
acaefc25 AB |
746 | /* Simple attribute files */ |
747 | ||
748 | struct simple_attr { | |
8b88b099 CH |
749 | int (*get)(void *, u64 *); |
750 | int (*set)(void *, u64); | |
acaefc25 AB |
751 | char get_buf[24]; /* enough to store a u64 and "\n\0" */ |
752 | char set_buf[24]; | |
753 | void *data; | |
754 | const char *fmt; /* format for read operation */ | |
7cf34c76 | 755 | struct mutex mutex; /* protects access to these buffers */ |
acaefc25 AB |
756 | }; |
757 | ||
758 | /* simple_attr_open is called by an actual attribute open file operation | |
759 | * to set the attribute specific access operations. */ | |
760 | int simple_attr_open(struct inode *inode, struct file *file, | |
8b88b099 | 761 | int (*get)(void *, u64 *), int (*set)(void *, u64), |
acaefc25 AB |
762 | const char *fmt) |
763 | { | |
764 | struct simple_attr *attr; | |
765 | ||
766 | attr = kmalloc(sizeof(*attr), GFP_KERNEL); | |
767 | if (!attr) | |
768 | return -ENOMEM; | |
769 | ||
770 | attr->get = get; | |
771 | attr->set = set; | |
8e18e294 | 772 | attr->data = inode->i_private; |
acaefc25 | 773 | attr->fmt = fmt; |
7cf34c76 | 774 | mutex_init(&attr->mutex); |
acaefc25 AB |
775 | |
776 | file->private_data = attr; | |
777 | ||
778 | return nonseekable_open(inode, file); | |
779 | } | |
12f38872 | 780 | EXPORT_SYMBOL_GPL(simple_attr_open); |
acaefc25 | 781 | |
74bedc4d | 782 | int simple_attr_release(struct inode *inode, struct file *file) |
acaefc25 AB |
783 | { |
784 | kfree(file->private_data); | |
785 | return 0; | |
786 | } | |
12f38872 | 787 | EXPORT_SYMBOL_GPL(simple_attr_release); /* GPL-only? This? Really? */ |
acaefc25 AB |
788 | |
789 | /* read from the buffer that is filled with the get function */ | |
790 | ssize_t simple_attr_read(struct file *file, char __user *buf, | |
791 | size_t len, loff_t *ppos) | |
792 | { | |
793 | struct simple_attr *attr; | |
794 | size_t size; | |
795 | ssize_t ret; | |
796 | ||
797 | attr = file->private_data; | |
798 | ||
799 | if (!attr->get) | |
800 | return -EACCES; | |
801 | ||
9261303a CH |
802 | ret = mutex_lock_interruptible(&attr->mutex); |
803 | if (ret) | |
804 | return ret; | |
805 | ||
8b88b099 | 806 | if (*ppos) { /* continued read */ |
acaefc25 | 807 | size = strlen(attr->get_buf); |
8b88b099 CH |
808 | } else { /* first read */ |
809 | u64 val; | |
810 | ret = attr->get(attr->data, &val); | |
811 | if (ret) | |
812 | goto out; | |
813 | ||
acaefc25 | 814 | size = scnprintf(attr->get_buf, sizeof(attr->get_buf), |
8b88b099 CH |
815 | attr->fmt, (unsigned long long)val); |
816 | } | |
acaefc25 AB |
817 | |
818 | ret = simple_read_from_buffer(buf, len, ppos, attr->get_buf, size); | |
8b88b099 | 819 | out: |
7cf34c76 | 820 | mutex_unlock(&attr->mutex); |
acaefc25 AB |
821 | return ret; |
822 | } | |
12f38872 | 823 | EXPORT_SYMBOL_GPL(simple_attr_read); |
acaefc25 AB |
824 | |
825 | /* interpret the buffer as a number to call the set function with */ | |
826 | ssize_t simple_attr_write(struct file *file, const char __user *buf, | |
827 | size_t len, loff_t *ppos) | |
828 | { | |
829 | struct simple_attr *attr; | |
830 | u64 val; | |
831 | size_t size; | |
832 | ssize_t ret; | |
833 | ||
834 | attr = file->private_data; | |
acaefc25 AB |
835 | if (!attr->set) |
836 | return -EACCES; | |
837 | ||
9261303a CH |
838 | ret = mutex_lock_interruptible(&attr->mutex); |
839 | if (ret) | |
840 | return ret; | |
841 | ||
acaefc25 AB |
842 | ret = -EFAULT; |
843 | size = min(sizeof(attr->set_buf) - 1, len); | |
844 | if (copy_from_user(attr->set_buf, buf, size)) | |
845 | goto out; | |
846 | ||
acaefc25 | 847 | attr->set_buf[size] = '\0'; |
f7b88631 | 848 | val = simple_strtoll(attr->set_buf, NULL, 0); |
05cc0cee WF |
849 | ret = attr->set(attr->data, val); |
850 | if (ret == 0) | |
851 | ret = len; /* on success, claim we got the whole input */ | |
acaefc25 | 852 | out: |
7cf34c76 | 853 | mutex_unlock(&attr->mutex); |
acaefc25 AB |
854 | return ret; |
855 | } | |
12f38872 | 856 | EXPORT_SYMBOL_GPL(simple_attr_write); |
acaefc25 | 857 | |
2596110a CH |
858 | /** |
859 | * generic_fh_to_dentry - generic helper for the fh_to_dentry export operation | |
860 | * @sb: filesystem to do the file handle conversion on | |
861 | * @fid: file handle to convert | |
862 | * @fh_len: length of the file handle in bytes | |
863 | * @fh_type: type of file handle | |
864 | * @get_inode: filesystem callback to retrieve inode | |
865 | * | |
866 | * This function decodes @fid as long as it has one of the well-known | |
867 | * Linux filehandle types and calls @get_inode on it to retrieve the | |
868 | * inode for the object specified in the file handle. | |
869 | */ | |
870 | struct dentry *generic_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
871 | int fh_len, int fh_type, struct inode *(*get_inode) | |
872 | (struct super_block *sb, u64 ino, u32 gen)) | |
873 | { | |
874 | struct inode *inode = NULL; | |
875 | ||
876 | if (fh_len < 2) | |
877 | return NULL; | |
878 | ||
879 | switch (fh_type) { | |
880 | case FILEID_INO32_GEN: | |
881 | case FILEID_INO32_GEN_PARENT: | |
882 | inode = get_inode(sb, fid->i32.ino, fid->i32.gen); | |
883 | break; | |
884 | } | |
885 | ||
4ea3ada2 | 886 | return d_obtain_alias(inode); |
2596110a CH |
887 | } |
888 | EXPORT_SYMBOL_GPL(generic_fh_to_dentry); | |
889 | ||
890 | /** | |
ca186830 | 891 | * generic_fh_to_parent - generic helper for the fh_to_parent export operation |
2596110a CH |
892 | * @sb: filesystem to do the file handle conversion on |
893 | * @fid: file handle to convert | |
894 | * @fh_len: length of the file handle in bytes | |
895 | * @fh_type: type of file handle | |
896 | * @get_inode: filesystem callback to retrieve inode | |
897 | * | |
898 | * This function decodes @fid as long as it has one of the well-known | |
899 | * Linux filehandle types and calls @get_inode on it to retrieve the | |
900 | * inode for the _parent_ object specified in the file handle if it | |
901 | * is specified in the file handle, or NULL otherwise. | |
902 | */ | |
903 | struct dentry *generic_fh_to_parent(struct super_block *sb, struct fid *fid, | |
904 | int fh_len, int fh_type, struct inode *(*get_inode) | |
905 | (struct super_block *sb, u64 ino, u32 gen)) | |
906 | { | |
907 | struct inode *inode = NULL; | |
908 | ||
909 | if (fh_len <= 2) | |
910 | return NULL; | |
911 | ||
912 | switch (fh_type) { | |
913 | case FILEID_INO32_GEN_PARENT: | |
914 | inode = get_inode(sb, fid->i32.parent_ino, | |
915 | (fh_len > 3 ? fid->i32.parent_gen : 0)); | |
916 | break; | |
917 | } | |
918 | ||
4ea3ada2 | 919 | return d_obtain_alias(inode); |
2596110a CH |
920 | } |
921 | EXPORT_SYMBOL_GPL(generic_fh_to_parent); | |
922 | ||
1b061d92 CH |
923 | /** |
924 | * generic_file_fsync - generic fsync implementation for simple filesystems | |
925 | * @file: file to synchronize | |
926 | * @datasync: only synchronize essential metadata if true | |
927 | * | |
928 | * This is a generic implementation of the fsync method for simple | |
929 | * filesystems which track all non-inode metadata in the buffers list | |
930 | * hanging off the address_space structure. | |
931 | */ | |
02c24a82 JB |
932 | int generic_file_fsync(struct file *file, loff_t start, loff_t end, |
933 | int datasync) | |
d5aacad5 | 934 | { |
7ea80859 | 935 | struct inode *inode = file->f_mapping->host; |
d5aacad5 AV |
936 | int err; |
937 | int ret; | |
938 | ||
02c24a82 JB |
939 | err = filemap_write_and_wait_range(inode->i_mapping, start, end); |
940 | if (err) | |
941 | return err; | |
942 | ||
943 | mutex_lock(&inode->i_mutex); | |
d5aacad5 AV |
944 | ret = sync_mapping_buffers(inode->i_mapping); |
945 | if (!(inode->i_state & I_DIRTY)) | |
02c24a82 | 946 | goto out; |
d5aacad5 | 947 | if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) |
02c24a82 | 948 | goto out; |
d5aacad5 | 949 | |
c3765016 | 950 | err = sync_inode_metadata(inode, 1); |
d5aacad5 AV |
951 | if (ret == 0) |
952 | ret = err; | |
02c24a82 JB |
953 | out: |
954 | mutex_unlock(&inode->i_mutex); | |
d5aacad5 AV |
955 | return ret; |
956 | } | |
1b061d92 CH |
957 | EXPORT_SYMBOL(generic_file_fsync); |
958 | ||
30ca22c7 PL |
959 | /** |
960 | * generic_check_addressable - Check addressability of file system | |
961 | * @blocksize_bits: log of file system block size | |
962 | * @num_blocks: number of blocks in file system | |
963 | * | |
964 | * Determine whether a file system with @num_blocks blocks (and a | |
965 | * block size of 2**@blocksize_bits) is addressable by the sector_t | |
966 | * and page cache of the system. Return 0 if so and -EFBIG otherwise. | |
967 | */ | |
968 | int generic_check_addressable(unsigned blocksize_bits, u64 num_blocks) | |
969 | { | |
970 | u64 last_fs_block = num_blocks - 1; | |
a33f13ef JB |
971 | u64 last_fs_page = |
972 | last_fs_block >> (PAGE_CACHE_SHIFT - blocksize_bits); | |
30ca22c7 PL |
973 | |
974 | if (unlikely(num_blocks == 0)) | |
975 | return 0; | |
976 | ||
977 | if ((blocksize_bits < 9) || (blocksize_bits > PAGE_CACHE_SHIFT)) | |
978 | return -EINVAL; | |
979 | ||
a33f13ef JB |
980 | if ((last_fs_block > (sector_t)(~0ULL) >> (blocksize_bits - 9)) || |
981 | (last_fs_page > (pgoff_t)(~0ULL))) { | |
30ca22c7 PL |
982 | return -EFBIG; |
983 | } | |
984 | return 0; | |
985 | } | |
986 | EXPORT_SYMBOL(generic_check_addressable); | |
987 | ||
1b061d92 CH |
988 | /* |
989 | * No-op implementation of ->fsync for in-memory filesystems. | |
990 | */ | |
02c24a82 | 991 | int noop_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1b061d92 CH |
992 | { |
993 | return 0; | |
994 | } | |
1b061d92 | 995 | EXPORT_SYMBOL(noop_fsync); |
87dc800b AV |
996 | |
997 | void kfree_put_link(struct dentry *dentry, struct nameidata *nd, | |
998 | void *cookie) | |
999 | { | |
1000 | char *s = nd_get_link(nd); | |
1001 | if (!IS_ERR(s)) | |
1002 | kfree(s); | |
1003 | } | |
1004 | EXPORT_SYMBOL(kfree_put_link); | |
6987843f AV |
1005 | |
1006 | /* | |
1007 | * nop .set_page_dirty method so that people can use .page_mkwrite on | |
1008 | * anon inodes. | |
1009 | */ | |
1010 | static int anon_set_page_dirty(struct page *page) | |
1011 | { | |
1012 | return 0; | |
1013 | }; | |
1014 | ||
1015 | /* | |
1016 | * A single inode exists for all anon_inode files. Contrary to pipes, | |
1017 | * anon_inode inodes have no associated per-instance data, so we need | |
1018 | * only allocate one of them. | |
1019 | */ | |
1020 | struct inode *alloc_anon_inode(struct super_block *s) | |
1021 | { | |
1022 | static const struct address_space_operations anon_aops = { | |
1023 | .set_page_dirty = anon_set_page_dirty, | |
1024 | }; | |
1025 | struct inode *inode = new_inode_pseudo(s); | |
1026 | ||
1027 | if (!inode) | |
1028 | return ERR_PTR(-ENOMEM); | |
1029 | ||
1030 | inode->i_ino = get_next_ino(); | |
1031 | inode->i_mapping->a_ops = &anon_aops; | |
1032 | ||
1033 | /* | |
1034 | * Mark the inode dirty from the very beginning, | |
1035 | * that way it will never be moved to the dirty | |
1036 | * list because mark_inode_dirty() will think | |
1037 | * that it already _is_ on the dirty list. | |
1038 | */ | |
1039 | inode->i_state = I_DIRTY; | |
1040 | inode->i_mode = S_IRUSR | S_IWUSR; | |
1041 | inode->i_uid = current_fsuid(); | |
1042 | inode->i_gid = current_fsgid(); | |
1043 | inode->i_flags |= S_PRIVATE; | |
1044 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
1045 | return inode; | |
1046 | } | |
1047 | EXPORT_SYMBOL(alloc_anon_inode); |