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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/fat/file.c | |
4 | * | |
5 | * Written 1992,1993 by Werner Almesberger | |
6 | * | |
7 | * regular file handling primitives for fat-based filesystems | |
8 | */ | |
9 | ||
16f7e0fe | 10 | #include <linux/capability.h> |
1da177e4 | 11 | #include <linux/module.h> |
7845bc3e | 12 | #include <linux/compat.h> |
42a74f20 | 13 | #include <linux/mount.h> |
ae78bf9c | 14 | #include <linux/blkdev.h> |
66114cad | 15 | #include <linux/backing-dev.h> |
b1da47e2 MS |
16 | #include <linux/fsnotify.h> |
17 | #include <linux/security.h> | |
b13bb33e | 18 | #include <linux/falloc.h> |
9e975dae | 19 | #include "fat.h" |
1da177e4 | 20 | |
b13bb33e NJ |
21 | static long fat_fallocate(struct file *file, int mode, |
22 | loff_t offset, loff_t len); | |
23 | ||
21bea495 CH |
24 | static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr) |
25 | { | |
26 | u32 attr; | |
27 | ||
5955102c | 28 | inode_lock(inode); |
21bea495 | 29 | attr = fat_make_attrs(inode); |
5955102c | 30 | inode_unlock(inode); |
21bea495 CH |
31 | |
32 | return put_user(attr, user_attr); | |
33 | } | |
34 | ||
35 | static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr) | |
1da177e4 | 36 | { |
496ad9aa | 37 | struct inode *inode = file_inode(file); |
1da177e4 | 38 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
21bea495 CH |
39 | int is_dir = S_ISDIR(inode->i_mode); |
40 | u32 attr, oldattr; | |
41 | struct iattr ia; | |
42 | int err; | |
1da177e4 | 43 | |
21bea495 CH |
44 | err = get_user(attr, user_attr); |
45 | if (err) | |
46 | goto out; | |
1da177e4 | 47 | |
a561be71 | 48 | err = mnt_want_write_file(file); |
21bea495 | 49 | if (err) |
e24f17da | 50 | goto out; |
5955102c | 51 | inode_lock(inode); |
21bea495 CH |
52 | |
53 | /* | |
54 | * ATTR_VOLUME and ATTR_DIR cannot be changed; this also | |
55 | * prevents the user from turning us into a VFAT | |
56 | * longname entry. Also, we obviously can't set | |
57 | * any of the NTFS attributes in the high 24 bits. | |
58 | */ | |
59 | attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR); | |
60 | /* Merge in ATTR_VOLUME and ATTR_DIR */ | |
61 | attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) | | |
62 | (is_dir ? ATTR_DIR : 0); | |
63 | oldattr = fat_make_attrs(inode); | |
64 | ||
65 | /* Equivalent to a chmod() */ | |
66 | ia.ia_valid = ATTR_MODE | ATTR_CTIME; | |
c2050a45 | 67 | ia.ia_ctime = current_time(inode); |
21bea495 CH |
68 | if (is_dir) |
69 | ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO); | |
70 | else { | |
71 | ia.ia_mode = fat_make_mode(sbi, attr, | |
72 | S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO)); | |
73 | } | |
1da177e4 | 74 | |
21bea495 CH |
75 | /* The root directory has no attributes */ |
76 | if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) { | |
77 | err = -EINVAL; | |
e24f17da | 78 | goto out_unlock_inode; |
1da177e4 | 79 | } |
1da177e4 | 80 | |
21bea495 CH |
81 | if (sbi->options.sys_immutable && |
82 | ((attr | oldattr) & ATTR_SYS) && | |
83 | !capable(CAP_LINUX_IMMUTABLE)) { | |
84 | err = -EPERM; | |
e24f17da | 85 | goto out_unlock_inode; |
21bea495 | 86 | } |
1da177e4 | 87 | |
21bea495 CH |
88 | /* |
89 | * The security check is questionable... We single | |
90 | * out the RO attribute for checking by the security | |
91 | * module, just because it maps to a file mode. | |
92 | */ | |
93 | err = security_inode_setattr(file->f_path.dentry, &ia); | |
94 | if (err) | |
e24f17da | 95 | goto out_unlock_inode; |
1da177e4 | 96 | |
21bea495 CH |
97 | /* This MUST be done before doing anything irreversible... */ |
98 | err = fat_setattr(file->f_path.dentry, &ia); | |
99 | if (err) | |
e24f17da | 100 | goto out_unlock_inode; |
21bea495 CH |
101 | |
102 | fsnotify_change(file->f_path.dentry, ia.ia_valid); | |
103 | if (sbi->options.sys_immutable) { | |
104 | if (attr & ATTR_SYS) | |
105 | inode->i_flags |= S_IMMUTABLE; | |
106 | else | |
1adffbae | 107 | inode->i_flags &= ~S_IMMUTABLE; |
21bea495 | 108 | } |
1da177e4 | 109 | |
21bea495 CH |
110 | fat_save_attrs(inode, attr); |
111 | mark_inode_dirty(inode); | |
21bea495 | 112 | out_unlock_inode: |
5955102c | 113 | inode_unlock(inode); |
e24f17da | 114 | mnt_drop_write_file(file); |
21bea495 CH |
115 | out: |
116 | return err; | |
117 | } | |
1da177e4 | 118 | |
6e5b93ee ML |
119 | static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr) |
120 | { | |
121 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
122 | return put_user(sbi->vol_id, user_attr); | |
123 | } | |
124 | ||
f663b5b3 WW |
125 | static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg) |
126 | { | |
127 | struct super_block *sb = inode->i_sb; | |
128 | struct fstrim_range __user *user_range; | |
129 | struct fstrim_range range; | |
130 | struct request_queue *q = bdev_get_queue(sb->s_bdev); | |
131 | int err; | |
132 | ||
133 | if (!capable(CAP_SYS_ADMIN)) | |
134 | return -EPERM; | |
135 | ||
136 | if (!blk_queue_discard(q)) | |
137 | return -EOPNOTSUPP; | |
138 | ||
139 | user_range = (struct fstrim_range __user *)arg; | |
140 | if (copy_from_user(&range, user_range, sizeof(range))) | |
141 | return -EFAULT; | |
142 | ||
143 | range.minlen = max_t(unsigned int, range.minlen, | |
144 | q->limits.discard_granularity); | |
145 | ||
146 | err = fat_trim_fs(inode, &range); | |
147 | if (err < 0) | |
148 | return err; | |
149 | ||
150 | if (copy_to_user(user_range, &range, sizeof(range))) | |
151 | return -EFAULT; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
7845bc3e | 156 | long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 157 | { |
496ad9aa | 158 | struct inode *inode = file_inode(filp); |
1da177e4 | 159 | u32 __user *user_attr = (u32 __user *)arg; |
1da177e4 | 160 | |
1da177e4 LT |
161 | switch (cmd) { |
162 | case FAT_IOCTL_GET_ATTRIBUTES: | |
21bea495 | 163 | return fat_ioctl_get_attributes(inode, user_attr); |
1da177e4 | 164 | case FAT_IOCTL_SET_ATTRIBUTES: |
21bea495 | 165 | return fat_ioctl_set_attributes(filp, user_attr); |
6e5b93ee ML |
166 | case FAT_IOCTL_GET_VOLUME_ID: |
167 | return fat_ioctl_get_volume_id(inode, user_attr); | |
f663b5b3 WW |
168 | case FITRIM: |
169 | return fat_ioctl_fitrim(inode, arg); | |
1da177e4 LT |
170 | default: |
171 | return -ENOTTY; /* Inappropriate ioctl for device */ | |
172 | } | |
173 | } | |
174 | ||
7845bc3e AB |
175 | #ifdef CONFIG_COMPAT |
176 | static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd, | |
177 | unsigned long arg) | |
178 | ||
179 | { | |
180 | return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
181 | } | |
182 | #endif | |
183 | ||
ae78bf9c CM |
184 | static int fat_file_release(struct inode *inode, struct file *filp) |
185 | { | |
186 | if ((filp->f_mode & FMODE_WRITE) && | |
187 | MSDOS_SB(inode->i_sb)->options.flush) { | |
188 | fat_flush_inodes(inode->i_sb, inode, NULL); | |
8aa7e847 | 189 | congestion_wait(BLK_RW_ASYNC, HZ/10); |
ae78bf9c CM |
190 | } |
191 | return 0; | |
192 | } | |
193 | ||
02c24a82 | 194 | int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
b522412a | 195 | { |
7ea80859 | 196 | struct inode *inode = filp->f_mapping->host; |
bd8309de HT |
197 | int err; |
198 | ||
199 | err = __generic_file_fsync(filp, start, end, datasync); | |
200 | if (err) | |
201 | return err; | |
b522412a | 202 | |
b522412a | 203 | err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping); |
bd8309de HT |
204 | if (err) |
205 | return err; | |
b522412a | 206 | |
bd8309de | 207 | return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); |
b522412a AV |
208 | } |
209 | ||
210 | ||
4b6f5d20 | 211 | const struct file_operations fat_file_operations = { |
1da177e4 | 212 | .llseek = generic_file_llseek, |
aad4f8bb | 213 | .read_iter = generic_file_read_iter, |
8174202b | 214 | .write_iter = generic_file_write_iter, |
1da177e4 | 215 | .mmap = generic_file_mmap, |
ae78bf9c | 216 | .release = fat_file_release, |
7845bc3e AB |
217 | .unlocked_ioctl = fat_generic_ioctl, |
218 | #ifdef CONFIG_COMPAT | |
219 | .compat_ioctl = fat_generic_compat_ioctl, | |
220 | #endif | |
b522412a | 221 | .fsync = fat_file_fsync, |
5ffc4ef4 | 222 | .splice_read = generic_file_splice_read, |
67ceb1ec | 223 | .splice_write = iter_file_splice_write, |
b13bb33e | 224 | .fallocate = fat_fallocate, |
1da177e4 LT |
225 | }; |
226 | ||
05eb0b51 OH |
227 | static int fat_cont_expand(struct inode *inode, loff_t size) |
228 | { | |
229 | struct address_space *mapping = inode->i_mapping; | |
230 | loff_t start = inode->i_size, count = size - inode->i_size; | |
231 | int err; | |
232 | ||
233 | err = generic_cont_expand_simple(inode, size); | |
234 | if (err) | |
235 | goto out; | |
236 | ||
cd83f6b1 | 237 | fat_truncate_time(inode, NULL, S_CTIME|S_MTIME); |
05eb0b51 | 238 | mark_inode_dirty(inode); |
2f3d675b JK |
239 | if (IS_SYNC(inode)) { |
240 | int err2; | |
241 | ||
242 | /* | |
243 | * Opencode syncing since we don't have a file open to use | |
244 | * standard fsync path. | |
245 | */ | |
246 | err = filemap_fdatawrite_range(mapping, start, | |
247 | start + count - 1); | |
248 | err2 = sync_mapping_buffers(mapping); | |
249 | if (!err) | |
250 | err = err2; | |
251 | err2 = write_inode_now(inode, 1); | |
252 | if (!err) | |
253 | err = err2; | |
254 | if (!err) { | |
255 | err = filemap_fdatawait_range(mapping, start, | |
256 | start + count - 1); | |
257 | } | |
258 | } | |
05eb0b51 OH |
259 | out: |
260 | return err; | |
261 | } | |
262 | ||
b13bb33e NJ |
263 | /* |
264 | * Preallocate space for a file. This implements fat's fallocate file | |
265 | * operation, which gets called from sys_fallocate system call. User | |
266 | * space requests len bytes at offset. If FALLOC_FL_KEEP_SIZE is set | |
267 | * we just allocate clusters without zeroing them out. Otherwise we | |
268 | * allocate and zero out clusters via an expanding truncate. | |
269 | */ | |
270 | static long fat_fallocate(struct file *file, int mode, | |
271 | loff_t offset, loff_t len) | |
272 | { | |
273 | int nr_cluster; /* Number of clusters to be allocated */ | |
274 | loff_t mm_bytes; /* Number of bytes to be allocated for file */ | |
275 | loff_t ondisksize; /* block aligned on-disk size in bytes*/ | |
276 | struct inode *inode = file->f_mapping->host; | |
277 | struct super_block *sb = inode->i_sb; | |
278 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
279 | int err = 0; | |
280 | ||
281 | /* No support for hole punch or other fallocate flags. */ | |
282 | if (mode & ~FALLOC_FL_KEEP_SIZE) | |
283 | return -EOPNOTSUPP; | |
284 | ||
285 | /* No support for dir */ | |
286 | if (!S_ISREG(inode->i_mode)) | |
287 | return -EOPNOTSUPP; | |
288 | ||
5955102c | 289 | inode_lock(inode); |
b13bb33e NJ |
290 | if (mode & FALLOC_FL_KEEP_SIZE) { |
291 | ondisksize = inode->i_blocks << 9; | |
292 | if ((offset + len) <= ondisksize) | |
293 | goto error; | |
294 | ||
295 | /* First compute the number of clusters to be allocated */ | |
296 | mm_bytes = offset + len - ondisksize; | |
297 | nr_cluster = (mm_bytes + (sbi->cluster_size - 1)) >> | |
298 | sbi->cluster_bits; | |
299 | ||
300 | /* Start the allocation.We are not zeroing out the clusters */ | |
301 | while (nr_cluster-- > 0) { | |
302 | err = fat_add_cluster(inode); | |
303 | if (err) | |
304 | goto error; | |
305 | } | |
306 | } else { | |
307 | if ((offset + len) <= i_size_read(inode)) | |
308 | goto error; | |
309 | ||
310 | /* This is just an expanding truncate */ | |
311 | err = fat_cont_expand(inode, (offset + len)); | |
312 | } | |
313 | ||
314 | error: | |
5955102c | 315 | inode_unlock(inode); |
b13bb33e NJ |
316 | return err; |
317 | } | |
318 | ||
1da177e4 LT |
319 | /* Free all clusters after the skip'th cluster. */ |
320 | static int fat_free(struct inode *inode, int skip) | |
321 | { | |
322 | struct super_block *sb = inode->i_sb; | |
323 | int err, wait, free_start, i_start, i_logstart; | |
324 | ||
325 | if (MSDOS_I(inode)->i_start == 0) | |
326 | return 0; | |
327 | ||
3b641407 OH |
328 | fat_cache_inval_inode(inode); |
329 | ||
1da177e4 | 330 | wait = IS_DIRSYNC(inode); |
3b641407 OH |
331 | i_start = free_start = MSDOS_I(inode)->i_start; |
332 | i_logstart = MSDOS_I(inode)->i_logstart; | |
333 | ||
334 | /* First, we write the new file size. */ | |
335 | if (!skip) { | |
336 | MSDOS_I(inode)->i_start = 0; | |
337 | MSDOS_I(inode)->i_logstart = 0; | |
338 | } | |
339 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
cd83f6b1 | 340 | fat_truncate_time(inode, NULL, S_CTIME|S_MTIME); |
3b641407 OH |
341 | if (wait) { |
342 | err = fat_sync_inode(inode); | |
343 | if (err) { | |
344 | MSDOS_I(inode)->i_start = i_start; | |
345 | MSDOS_I(inode)->i_logstart = i_logstart; | |
346 | return err; | |
347 | } | |
348 | } else | |
349 | mark_inode_dirty(inode); | |
350 | ||
351 | /* Write a new EOF, and get the remaining cluster chain for freeing. */ | |
1da177e4 LT |
352 | if (skip) { |
353 | struct fat_entry fatent; | |
354 | int ret, fclus, dclus; | |
355 | ||
356 | ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus); | |
357 | if (ret < 0) | |
358 | return ret; | |
359 | else if (ret == FAT_ENT_EOF) | |
360 | return 0; | |
361 | ||
362 | fatent_init(&fatent); | |
363 | ret = fat_ent_read(inode, &fatent, dclus); | |
364 | if (ret == FAT_ENT_EOF) { | |
365 | fatent_brelse(&fatent); | |
366 | return 0; | |
367 | } else if (ret == FAT_ENT_FREE) { | |
85c78591 | 368 | fat_fs_error(sb, |
1da177e4 | 369 | "%s: invalid cluster chain (i_pos %lld)", |
8e24eea7 | 370 | __func__, MSDOS_I(inode)->i_pos); |
1da177e4 LT |
371 | ret = -EIO; |
372 | } else if (ret > 0) { | |
373 | err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait); | |
374 | if (err) | |
375 | ret = err; | |
376 | } | |
377 | fatent_brelse(&fatent); | |
378 | if (ret < 0) | |
379 | return ret; | |
380 | ||
381 | free_start = ret; | |
1da177e4 | 382 | } |
1da177e4 LT |
383 | inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9); |
384 | ||
385 | /* Freeing the remained cluster chain */ | |
386 | return fat_free_clusters(inode, free_start); | |
1da177e4 LT |
387 | } |
388 | ||
459f6ed3 | 389 | void fat_truncate_blocks(struct inode *inode, loff_t offset) |
1da177e4 | 390 | { |
9c20616c | 391 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
1da177e4 LT |
392 | const unsigned int cluster_size = sbi->cluster_size; |
393 | int nr_clusters; | |
394 | ||
395 | /* | |
396 | * This protects against truncating a file bigger than it was then | |
397 | * trying to write into the hole. | |
398 | */ | |
459f6ed3 NP |
399 | if (MSDOS_I(inode)->mmu_private > offset) |
400 | MSDOS_I(inode)->mmu_private = offset; | |
1da177e4 | 401 | |
459f6ed3 | 402 | nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits; |
1da177e4 | 403 | |
1da177e4 | 404 | fat_free(inode, nr_clusters); |
ae78bf9c | 405 | fat_flush_inodes(inode->i_sb, inode, NULL); |
1da177e4 LT |
406 | } |
407 | ||
a528d35e DH |
408 | int fat_getattr(const struct path *path, struct kstat *stat, |
409 | u32 request_mask, unsigned int flags) | |
da63fc7c | 410 | { |
a528d35e | 411 | struct inode *inode = d_inode(path->dentry); |
da63fc7c OH |
412 | generic_fillattr(inode, stat); |
413 | stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size; | |
ea3983ac NJ |
414 | |
415 | if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) { | |
416 | /* Use i_pos for ino. This is used as fileid of nfs. */ | |
417 | stat->ino = fat_i_pos_read(MSDOS_SB(inode->i_sb), inode); | |
418 | } | |
da63fc7c OH |
419 | return 0; |
420 | } | |
421 | EXPORT_SYMBOL_GPL(fat_getattr); | |
422 | ||
2d518f84 OH |
423 | static int fat_sanitize_mode(const struct msdos_sb_info *sbi, |
424 | struct inode *inode, umode_t *mode_ptr) | |
1278fdd3 | 425 | { |
dacd0e7b | 426 | umode_t mask, perm; |
1278fdd3 | 427 | |
2d518f84 OH |
428 | /* |
429 | * Note, the basic check is already done by a caller of | |
9c0aa1b8 | 430 | * (attr->ia_mode & ~FAT_VALID_MODE) |
2d518f84 OH |
431 | */ |
432 | ||
433 | if (S_ISREG(inode->i_mode)) | |
1278fdd3 OH |
434 | mask = sbi->options.fs_fmask; |
435 | else | |
436 | mask = sbi->options.fs_dmask; | |
437 | ||
2d518f84 OH |
438 | perm = *mode_ptr & ~(S_IFMT | mask); |
439 | ||
1278fdd3 OH |
440 | /* |
441 | * Of the r and x bits, all (subject to umask) must be present. Of the | |
442 | * w bits, either all (subject to umask) or none must be present. | |
dfc209c0 OH |
443 | * |
444 | * If fat_mode_can_hold_ro(inode) is false, can't change w bits. | |
1278fdd3 | 445 | */ |
2d518f84 | 446 | if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO))) |
1278fdd3 | 447 | return -EPERM; |
dfc209c0 OH |
448 | if (fat_mode_can_hold_ro(inode)) { |
449 | if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask))) | |
450 | return -EPERM; | |
451 | } else { | |
452 | if ((perm & S_IWUGO) != (S_IWUGO & ~mask)) | |
453 | return -EPERM; | |
454 | } | |
1278fdd3 | 455 | |
2d518f84 OH |
456 | *mode_ptr &= S_IFMT | perm; |
457 | ||
1278fdd3 OH |
458 | return 0; |
459 | } | |
460 | ||
1ae43f82 OH |
461 | static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode) |
462 | { | |
dacd0e7b | 463 | umode_t allow_utime = sbi->options.allow_utime; |
1ae43f82 | 464 | |
170782eb | 465 | if (!uid_eq(current_fsuid(), inode->i_uid)) { |
1ae43f82 OH |
466 | if (in_group_p(inode->i_gid)) |
467 | allow_utime >>= 3; | |
468 | if (allow_utime & MAY_WRITE) | |
469 | return 1; | |
470 | } | |
471 | ||
472 | /* use a default check */ | |
473 | return 0; | |
474 | } | |
475 | ||
17263849 | 476 | #define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET) |
9c0aa1b8 OH |
477 | /* valid file mode bits */ |
478 | #define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO) | |
17263849 | 479 | |
1278fdd3 OH |
480 | int fat_setattr(struct dentry *dentry, struct iattr *attr) |
481 | { | |
482 | struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); | |
2b0143b5 | 483 | struct inode *inode = d_inode(dentry); |
1ae43f82 | 484 | unsigned int ia_valid; |
dfc209c0 | 485 | int error; |
1278fdd3 | 486 | |
1ae43f82 OH |
487 | /* Check for setting the inode time. */ |
488 | ia_valid = attr->ia_valid; | |
17263849 | 489 | if (ia_valid & TIMES_SET_FLAGS) { |
1ae43f82 | 490 | if (fat_allow_set_time(sbi, inode)) |
17263849 | 491 | attr->ia_valid &= ~TIMES_SET_FLAGS; |
1ae43f82 OH |
492 | } |
493 | ||
31051c85 | 494 | error = setattr_prepare(dentry, attr); |
1ae43f82 | 495 | attr->ia_valid = ia_valid; |
1278fdd3 OH |
496 | if (error) { |
497 | if (sbi->options.quiet) | |
498 | error = 0; | |
499 | goto out; | |
500 | } | |
2d518f84 | 501 | |
db78b877 CH |
502 | /* |
503 | * Expand the file. Since inode_setattr() updates ->i_size | |
504 | * before calling the ->truncate(), but FAT needs to fill the | |
505 | * hole before it. XXX: this is no longer true with new truncate | |
506 | * sequence. | |
507 | */ | |
508 | if (attr->ia_valid & ATTR_SIZE) { | |
562c72aa CH |
509 | inode_dio_wait(inode); |
510 | ||
db78b877 CH |
511 | if (attr->ia_size > inode->i_size) { |
512 | error = fat_cont_expand(inode, attr->ia_size); | |
513 | if (error || attr->ia_valid == ATTR_SIZE) | |
514 | goto out; | |
515 | attr->ia_valid &= ~ATTR_SIZE; | |
516 | } | |
517 | } | |
518 | ||
1278fdd3 | 519 | if (((attr->ia_valid & ATTR_UID) && |
170782eb | 520 | (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) || |
1278fdd3 | 521 | ((attr->ia_valid & ATTR_GID) && |
170782eb | 522 | (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) || |
e97e8de3 | 523 | ((attr->ia_valid & ATTR_MODE) && |
9c0aa1b8 | 524 | (attr->ia_mode & ~FAT_VALID_MODE))) |
1278fdd3 OH |
525 | error = -EPERM; |
526 | ||
527 | if (error) { | |
528 | if (sbi->options.quiet) | |
529 | error = 0; | |
530 | goto out; | |
531 | } | |
532 | ||
2d518f84 OH |
533 | /* |
534 | * We don't return -EPERM here. Yes, strange, but this is too | |
535 | * old behavior. | |
536 | */ | |
537 | if (attr->ia_valid & ATTR_MODE) { | |
538 | if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) | |
539 | attr->ia_valid &= ~ATTR_MODE; | |
540 | } | |
1278fdd3 | 541 | |
459f6ed3 | 542 | if (attr->ia_valid & ATTR_SIZE) { |
c0ef0cc9 NJ |
543 | error = fat_block_truncate_page(inode, attr->ia_size); |
544 | if (error) | |
545 | goto out; | |
58268691 | 546 | down_write(&MSDOS_I(inode)->truncate_lock); |
2c27c65e CH |
547 | truncate_setsize(inode, attr->ia_size); |
548 | fat_truncate_blocks(inode, attr->ia_size); | |
58268691 | 549 | up_write(&MSDOS_I(inode)->truncate_lock); |
459f6ed3 NP |
550 | } |
551 | ||
22ea4eba FS |
552 | /* |
553 | * setattr_copy can't truncate these appropriately, so we'll | |
554 | * copy them ourselves | |
555 | */ | |
556 | if (attr->ia_valid & ATTR_ATIME) | |
557 | fat_truncate_time(inode, &attr->ia_atime, S_ATIME); | |
558 | if (attr->ia_valid & ATTR_CTIME) | |
559 | fat_truncate_time(inode, &attr->ia_ctime, S_CTIME); | |
560 | if (attr->ia_valid & ATTR_MTIME) | |
561 | fat_truncate_time(inode, &attr->ia_mtime, S_MTIME); | |
562 | attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME); | |
563 | ||
6a1a90ad | 564 | setattr_copy(inode, attr); |
459f6ed3 | 565 | mark_inode_dirty(inode); |
1278fdd3 | 566 | out: |
1278fdd3 OH |
567 | return error; |
568 | } | |
569 | EXPORT_SYMBOL_GPL(fat_setattr); | |
570 | ||
754661f1 | 571 | const struct inode_operations fat_file_inode_operations = { |
1278fdd3 | 572 | .setattr = fat_setattr, |
da63fc7c | 573 | .getattr = fat_getattr, |
6bb885ec | 574 | .update_time = fat_update_time, |
1da177e4 | 575 | }; |