Commit | Line | Data |
---|---|---|
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 | ||
e348e65a | 28 | inode_lock_shared(inode); |
21bea495 | 29 | attr = fat_make_attrs(inode); |
e348e65a | 30 | inode_unlock_shared(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 | */ | |
c1632a0f | 93 | err = security_inode_setattr(file_mnt_idmap(file), |
0e363cf3 | 94 | file->f_path.dentry, &ia); |
21bea495 | 95 | if (err) |
e24f17da | 96 | goto out_unlock_inode; |
1da177e4 | 97 | |
21bea495 | 98 | /* This MUST be done before doing anything irreversible... */ |
c1632a0f | 99 | err = fat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia); |
21bea495 | 100 | if (err) |
e24f17da | 101 | goto out_unlock_inode; |
21bea495 CH |
102 | |
103 | fsnotify_change(file->f_path.dentry, ia.ia_valid); | |
104 | if (sbi->options.sys_immutable) { | |
105 | if (attr & ATTR_SYS) | |
106 | inode->i_flags |= S_IMMUTABLE; | |
107 | else | |
1adffbae | 108 | inode->i_flags &= ~S_IMMUTABLE; |
21bea495 | 109 | } |
1da177e4 | 110 | |
21bea495 CH |
111 | fat_save_attrs(inode, attr); |
112 | mark_inode_dirty(inode); | |
21bea495 | 113 | out_unlock_inode: |
5955102c | 114 | inode_unlock(inode); |
e24f17da | 115 | mnt_drop_write_file(file); |
21bea495 CH |
116 | out: |
117 | return err; | |
118 | } | |
1da177e4 | 119 | |
6e5b93ee ML |
120 | static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr) |
121 | { | |
122 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); | |
123 | return put_user(sbi->vol_id, user_attr); | |
124 | } | |
125 | ||
f663b5b3 WW |
126 | static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg) |
127 | { | |
128 | struct super_block *sb = inode->i_sb; | |
129 | struct fstrim_range __user *user_range; | |
130 | struct fstrim_range range; | |
f663b5b3 WW |
131 | int err; |
132 | ||
133 | if (!capable(CAP_SYS_ADMIN)) | |
134 | return -EPERM; | |
135 | ||
70200574 | 136 | if (!bdev_max_discard_sectors(sb->s_bdev)) |
f663b5b3 WW |
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, | |
7b47ef52 | 144 | bdev_discard_granularity(sb->s_bdev)); |
f663b5b3 WW |
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 | ||
ae78bf9c CM |
175 | static int fat_file_release(struct inode *inode, struct file *filp) |
176 | { | |
177 | if ((filp->f_mode & FMODE_WRITE) && | |
9bb56d59 | 178 | MSDOS_SB(inode->i_sb)->options.flush) { |
ae78bf9c | 179 | fat_flush_inodes(inode->i_sb, inode, NULL); |
9bb56d59 N |
180 | set_current_state(TASK_UNINTERRUPTIBLE); |
181 | io_schedule_timeout(HZ/10); | |
ae78bf9c CM |
182 | } |
183 | return 0; | |
184 | } | |
185 | ||
02c24a82 | 186 | int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
b522412a | 187 | { |
7ea80859 | 188 | struct inode *inode = filp->f_mapping->host; |
bd8309de HT |
189 | int err; |
190 | ||
191 | err = __generic_file_fsync(filp, start, end, datasync); | |
192 | if (err) | |
193 | return err; | |
b522412a | 194 | |
b522412a | 195 | err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping); |
bd8309de HT |
196 | if (err) |
197 | return err; | |
b522412a | 198 | |
c6bf3f0e | 199 | return blkdev_issue_flush(inode->i_sb->s_bdev); |
b522412a AV |
200 | } |
201 | ||
202 | ||
4b6f5d20 | 203 | const struct file_operations fat_file_operations = { |
1da177e4 | 204 | .llseek = generic_file_llseek, |
aad4f8bb | 205 | .read_iter = generic_file_read_iter, |
8174202b | 206 | .write_iter = generic_file_write_iter, |
1da177e4 | 207 | .mmap = generic_file_mmap, |
ae78bf9c | 208 | .release = fat_file_release, |
7845bc3e | 209 | .unlocked_ioctl = fat_generic_ioctl, |
407e9ef7 | 210 | .compat_ioctl = compat_ptr_ioctl, |
b522412a | 211 | .fsync = fat_file_fsync, |
2cb1e089 | 212 | .splice_read = filemap_splice_read, |
67ceb1ec | 213 | .splice_write = iter_file_splice_write, |
b13bb33e | 214 | .fallocate = fat_fallocate, |
1da177e4 LT |
215 | }; |
216 | ||
05eb0b51 OH |
217 | static int fat_cont_expand(struct inode *inode, loff_t size) |
218 | { | |
219 | struct address_space *mapping = inode->i_mapping; | |
220 | loff_t start = inode->i_size, count = size - inode->i_size; | |
221 | int err; | |
222 | ||
223 | err = generic_cont_expand_simple(inode, size); | |
224 | if (err) | |
225 | goto out; | |
226 | ||
cd83f6b1 | 227 | fat_truncate_time(inode, NULL, S_CTIME|S_MTIME); |
05eb0b51 | 228 | mark_inode_dirty(inode); |
2f3d675b JK |
229 | if (IS_SYNC(inode)) { |
230 | int err2; | |
231 | ||
232 | /* | |
233 | * Opencode syncing since we don't have a file open to use | |
234 | * standard fsync path. | |
235 | */ | |
236 | err = filemap_fdatawrite_range(mapping, start, | |
237 | start + count - 1); | |
238 | err2 = sync_mapping_buffers(mapping); | |
239 | if (!err) | |
240 | err = err2; | |
241 | err2 = write_inode_now(inode, 1); | |
242 | if (!err) | |
243 | err = err2; | |
244 | if (!err) { | |
245 | err = filemap_fdatawait_range(mapping, start, | |
246 | start + count - 1); | |
247 | } | |
248 | } | |
05eb0b51 OH |
249 | out: |
250 | return err; | |
251 | } | |
252 | ||
b13bb33e NJ |
253 | /* |
254 | * Preallocate space for a file. This implements fat's fallocate file | |
255 | * operation, which gets called from sys_fallocate system call. User | |
256 | * space requests len bytes at offset. If FALLOC_FL_KEEP_SIZE is set | |
257 | * we just allocate clusters without zeroing them out. Otherwise we | |
258 | * allocate and zero out clusters via an expanding truncate. | |
259 | */ | |
260 | static long fat_fallocate(struct file *file, int mode, | |
261 | loff_t offset, loff_t len) | |
262 | { | |
263 | int nr_cluster; /* Number of clusters to be allocated */ | |
264 | loff_t mm_bytes; /* Number of bytes to be allocated for file */ | |
265 | loff_t ondisksize; /* block aligned on-disk size in bytes*/ | |
266 | struct inode *inode = file->f_mapping->host; | |
267 | struct super_block *sb = inode->i_sb; | |
268 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
269 | int err = 0; | |
270 | ||
271 | /* No support for hole punch or other fallocate flags. */ | |
272 | if (mode & ~FALLOC_FL_KEEP_SIZE) | |
273 | return -EOPNOTSUPP; | |
274 | ||
275 | /* No support for dir */ | |
276 | if (!S_ISREG(inode->i_mode)) | |
277 | return -EOPNOTSUPP; | |
278 | ||
5955102c | 279 | inode_lock(inode); |
b13bb33e NJ |
280 | if (mode & FALLOC_FL_KEEP_SIZE) { |
281 | ondisksize = inode->i_blocks << 9; | |
282 | if ((offset + len) <= ondisksize) | |
283 | goto error; | |
284 | ||
285 | /* First compute the number of clusters to be allocated */ | |
286 | mm_bytes = offset + len - ondisksize; | |
287 | nr_cluster = (mm_bytes + (sbi->cluster_size - 1)) >> | |
288 | sbi->cluster_bits; | |
289 | ||
290 | /* Start the allocation.We are not zeroing out the clusters */ | |
291 | while (nr_cluster-- > 0) { | |
292 | err = fat_add_cluster(inode); | |
293 | if (err) | |
294 | goto error; | |
295 | } | |
296 | } else { | |
297 | if ((offset + len) <= i_size_read(inode)) | |
298 | goto error; | |
299 | ||
300 | /* This is just an expanding truncate */ | |
301 | err = fat_cont_expand(inode, (offset + len)); | |
302 | } | |
303 | ||
304 | error: | |
5955102c | 305 | inode_unlock(inode); |
b13bb33e NJ |
306 | return err; |
307 | } | |
308 | ||
1da177e4 LT |
309 | /* Free all clusters after the skip'th cluster. */ |
310 | static int fat_free(struct inode *inode, int skip) | |
311 | { | |
312 | struct super_block *sb = inode->i_sb; | |
313 | int err, wait, free_start, i_start, i_logstart; | |
314 | ||
315 | if (MSDOS_I(inode)->i_start == 0) | |
316 | return 0; | |
317 | ||
3b641407 OH |
318 | fat_cache_inval_inode(inode); |
319 | ||
1da177e4 | 320 | wait = IS_DIRSYNC(inode); |
3b641407 OH |
321 | i_start = free_start = MSDOS_I(inode)->i_start; |
322 | i_logstart = MSDOS_I(inode)->i_logstart; | |
323 | ||
324 | /* First, we write the new file size. */ | |
325 | if (!skip) { | |
326 | MSDOS_I(inode)->i_start = 0; | |
327 | MSDOS_I(inode)->i_logstart = 0; | |
328 | } | |
329 | MSDOS_I(inode)->i_attrs |= ATTR_ARCH; | |
cd83f6b1 | 330 | fat_truncate_time(inode, NULL, S_CTIME|S_MTIME); |
3b641407 OH |
331 | if (wait) { |
332 | err = fat_sync_inode(inode); | |
333 | if (err) { | |
334 | MSDOS_I(inode)->i_start = i_start; | |
335 | MSDOS_I(inode)->i_logstart = i_logstart; | |
336 | return err; | |
337 | } | |
338 | } else | |
339 | mark_inode_dirty(inode); | |
340 | ||
341 | /* Write a new EOF, and get the remaining cluster chain for freeing. */ | |
1da177e4 LT |
342 | if (skip) { |
343 | struct fat_entry fatent; | |
344 | int ret, fclus, dclus; | |
345 | ||
346 | ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus); | |
347 | if (ret < 0) | |
348 | return ret; | |
349 | else if (ret == FAT_ENT_EOF) | |
350 | return 0; | |
351 | ||
352 | fatent_init(&fatent); | |
353 | ret = fat_ent_read(inode, &fatent, dclus); | |
354 | if (ret == FAT_ENT_EOF) { | |
355 | fatent_brelse(&fatent); | |
356 | return 0; | |
357 | } else if (ret == FAT_ENT_FREE) { | |
85c78591 | 358 | fat_fs_error(sb, |
1da177e4 | 359 | "%s: invalid cluster chain (i_pos %lld)", |
8e24eea7 | 360 | __func__, MSDOS_I(inode)->i_pos); |
1da177e4 LT |
361 | ret = -EIO; |
362 | } else if (ret > 0) { | |
363 | err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait); | |
364 | if (err) | |
365 | ret = err; | |
366 | } | |
367 | fatent_brelse(&fatent); | |
368 | if (ret < 0) | |
369 | return ret; | |
370 | ||
371 | free_start = ret; | |
1da177e4 | 372 | } |
1da177e4 LT |
373 | inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9); |
374 | ||
375 | /* Freeing the remained cluster chain */ | |
376 | return fat_free_clusters(inode, free_start); | |
1da177e4 LT |
377 | } |
378 | ||
459f6ed3 | 379 | void fat_truncate_blocks(struct inode *inode, loff_t offset) |
1da177e4 | 380 | { |
9c20616c | 381 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
1da177e4 LT |
382 | const unsigned int cluster_size = sbi->cluster_size; |
383 | int nr_clusters; | |
384 | ||
385 | /* | |
386 | * This protects against truncating a file bigger than it was then | |
387 | * trying to write into the hole. | |
388 | */ | |
459f6ed3 | 389 | if (MSDOS_I(inode)->mmu_private > offset) |
390 | MSDOS_I(inode)->mmu_private = offset; | |
1da177e4 | 391 | |
459f6ed3 | 392 | nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits; |
1da177e4 | 393 | |
1da177e4 | 394 | fat_free(inode, nr_clusters); |
ae78bf9c | 395 | fat_flush_inodes(inode->i_sb, inode, NULL); |
1da177e4 LT |
396 | } |
397 | ||
b74d24f7 | 398 | int fat_getattr(struct mnt_idmap *idmap, const struct path *path, |
549c7297 | 399 | struct kstat *stat, u32 request_mask, unsigned int flags) |
da63fc7c | 400 | { |
a528d35e | 401 | struct inode *inode = d_inode(path->dentry); |
30abce05 CCC |
402 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
403 | ||
0d72b928 | 404 | generic_fillattr(idmap, request_mask, inode, stat); |
30abce05 | 405 | stat->blksize = sbi->cluster_size; |
ea3983ac | 406 | |
30abce05 | 407 | if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) { |
ea3983ac | 408 | /* Use i_pos for ino. This is used as fileid of nfs. */ |
30abce05 | 409 | stat->ino = fat_i_pos_read(sbi, inode); |
ea3983ac | 410 | } |
30abce05 CCC |
411 | |
412 | if (sbi->options.isvfat && request_mask & STATX_BTIME) { | |
413 | stat->result_mask |= STATX_BTIME; | |
414 | stat->btime = MSDOS_I(inode)->i_crtime; | |
415 | } | |
416 | ||
da63fc7c OH |
417 | return 0; |
418 | } | |
419 | EXPORT_SYMBOL_GPL(fat_getattr); | |
420 | ||
2d518f84 OH |
421 | static int fat_sanitize_mode(const struct msdos_sb_info *sbi, |
422 | struct inode *inode, umode_t *mode_ptr) | |
1278fdd3 | 423 | { |
dacd0e7b | 424 | umode_t mask, perm; |
1278fdd3 | 425 | |
2d518f84 OH |
426 | /* |
427 | * Note, the basic check is already done by a caller of | |
9c0aa1b8 | 428 | * (attr->ia_mode & ~FAT_VALID_MODE) |
2d518f84 OH |
429 | */ |
430 | ||
431 | if (S_ISREG(inode->i_mode)) | |
1278fdd3 OH |
432 | mask = sbi->options.fs_fmask; |
433 | else | |
434 | mask = sbi->options.fs_dmask; | |
435 | ||
2d518f84 OH |
436 | perm = *mode_ptr & ~(S_IFMT | mask); |
437 | ||
1278fdd3 OH |
438 | /* |
439 | * Of the r and x bits, all (subject to umask) must be present. Of the | |
440 | * w bits, either all (subject to umask) or none must be present. | |
dfc209c0 OH |
441 | * |
442 | * If fat_mode_can_hold_ro(inode) is false, can't change w bits. | |
1278fdd3 | 443 | */ |
2d518f84 | 444 | if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO))) |
1278fdd3 | 445 | return -EPERM; |
dfc209c0 OH |
446 | if (fat_mode_can_hold_ro(inode)) { |
447 | if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask))) | |
448 | return -EPERM; | |
449 | } else { | |
450 | if ((perm & S_IWUGO) != (S_IWUGO & ~mask)) | |
451 | return -EPERM; | |
452 | } | |
1278fdd3 | 453 | |
2d518f84 OH |
454 | *mode_ptr &= S_IFMT | perm; |
455 | ||
1278fdd3 OH |
456 | return 0; |
457 | } | |
458 | ||
e67fe633 | 459 | static int fat_allow_set_time(struct mnt_idmap *idmap, |
4b789936 | 460 | struct msdos_sb_info *sbi, struct inode *inode) |
1ae43f82 | 461 | { |
dacd0e7b | 462 | umode_t allow_utime = sbi->options.allow_utime; |
1ae43f82 | 463 | |
e67fe633 | 464 | if (!vfsuid_eq_kuid(i_uid_into_vfsuid(idmap, inode), |
41d27f51 | 465 | current_fsuid())) { |
e67fe633 | 466 | if (vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode))) |
1ae43f82 OH |
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 | |
c1632a0f | 480 | int fat_setattr(struct mnt_idmap *idmap, struct dentry *dentry, |
549c7297 | 481 | struct iattr *attr) |
1278fdd3 OH |
482 | { |
483 | struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb); | |
2b0143b5 | 484 | struct inode *inode = d_inode(dentry); |
1ae43f82 | 485 | unsigned int ia_valid; |
dfc209c0 | 486 | int error; |
1278fdd3 | 487 | |
1ae43f82 OH |
488 | /* Check for setting the inode time. */ |
489 | ia_valid = attr->ia_valid; | |
17263849 | 490 | if (ia_valid & TIMES_SET_FLAGS) { |
e67fe633 | 491 | if (fat_allow_set_time(idmap, sbi, inode)) |
17263849 | 492 | attr->ia_valid &= ~TIMES_SET_FLAGS; |
1ae43f82 OH |
493 | } |
494 | ||
c1632a0f | 495 | error = setattr_prepare(idmap, dentry, attr); |
1ae43f82 | 496 | attr->ia_valid = ia_valid; |
1278fdd3 OH |
497 | if (error) { |
498 | if (sbi->options.quiet) | |
499 | error = 0; | |
500 | goto out; | |
501 | } | |
2d518f84 | 502 | |
db78b877 CH |
503 | /* |
504 | * Expand the file. Since inode_setattr() updates ->i_size | |
505 | * before calling the ->truncate(), but FAT needs to fill the | |
506 | * hole before it. XXX: this is no longer true with new truncate | |
507 | * sequence. | |
508 | */ | |
509 | if (attr->ia_valid & ATTR_SIZE) { | |
562c72aa CH |
510 | inode_dio_wait(inode); |
511 | ||
db78b877 CH |
512 | if (attr->ia_size > inode->i_size) { |
513 | error = fat_cont_expand(inode, attr->ia_size); | |
514 | if (error || attr->ia_valid == ATTR_SIZE) | |
515 | goto out; | |
516 | attr->ia_valid &= ~ATTR_SIZE; | |
517 | } | |
518 | } | |
519 | ||
1278fdd3 | 520 | if (((attr->ia_valid & ATTR_UID) && |
4d7ca409 | 521 | (!uid_eq(from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid), |
b27c82e1 | 522 | sbi->options.fs_uid))) || |
1278fdd3 | 523 | ((attr->ia_valid & ATTR_GID) && |
4d7ca409 | 524 | (!gid_eq(from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid), |
b27c82e1 | 525 | sbi->options.fs_gid))) || |
e97e8de3 | 526 | ((attr->ia_valid & ATTR_MODE) && |
9c0aa1b8 | 527 | (attr->ia_mode & ~FAT_VALID_MODE))) |
1278fdd3 OH |
528 | error = -EPERM; |
529 | ||
530 | if (error) { | |
531 | if (sbi->options.quiet) | |
532 | error = 0; | |
533 | goto out; | |
534 | } | |
535 | ||
2d518f84 OH |
536 | /* |
537 | * We don't return -EPERM here. Yes, strange, but this is too | |
538 | * old behavior. | |
539 | */ | |
540 | if (attr->ia_valid & ATTR_MODE) { | |
541 | if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) | |
542 | attr->ia_valid &= ~ATTR_MODE; | |
543 | } | |
1278fdd3 | 544 | |
459f6ed3 | 545 | if (attr->ia_valid & ATTR_SIZE) { |
c0ef0cc9 NJ |
546 | error = fat_block_truncate_page(inode, attr->ia_size); |
547 | if (error) | |
548 | goto out; | |
58268691 | 549 | down_write(&MSDOS_I(inode)->truncate_lock); |
2c27c65e CH |
550 | truncate_setsize(inode, attr->ia_size); |
551 | fat_truncate_blocks(inode, attr->ia_size); | |
58268691 | 552 | up_write(&MSDOS_I(inode)->truncate_lock); |
459f6ed3 | 553 | } |
554 | ||
22ea4eba FS |
555 | /* |
556 | * setattr_copy can't truncate these appropriately, so we'll | |
557 | * copy them ourselves | |
558 | */ | |
559 | if (attr->ia_valid & ATTR_ATIME) | |
560 | fat_truncate_time(inode, &attr->ia_atime, S_ATIME); | |
561 | if (attr->ia_valid & ATTR_CTIME) | |
562 | fat_truncate_time(inode, &attr->ia_ctime, S_CTIME); | |
563 | if (attr->ia_valid & ATTR_MTIME) | |
564 | fat_truncate_time(inode, &attr->ia_mtime, S_MTIME); | |
565 | attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME); | |
566 | ||
c1632a0f | 567 | setattr_copy(idmap, inode, attr); |
459f6ed3 | 568 | mark_inode_dirty(inode); |
1278fdd3 | 569 | out: |
1278fdd3 OH |
570 | return error; |
571 | } | |
572 | EXPORT_SYMBOL_GPL(fat_setattr); | |
573 | ||
754661f1 | 574 | const struct inode_operations fat_file_inode_operations = { |
1278fdd3 | 575 | .setattr = fat_setattr, |
da63fc7c | 576 | .getattr = fat_getattr, |
6bb885ec | 577 | .update_time = fat_update_time, |
1da177e4 | 578 | }; |