blob: 9b104f543056238016c683ef822046a784169f50 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/fat/file.c
3 *
4 * Written 1992,1993 by Werner Almesberger
5 *
6 * regular file handling primitives for fat-based filesystems
7 */
8
Randy Dunlap16f7e0f2006-01-11 12:17:46 -08009#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/module.h>
Arnd Bergmann7845bc3e2010-05-17 08:13:47 +090011#include <linux/compat.h>
Dave Hansen42a74f22008-02-15 14:37:46 -080012#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/buffer_head.h>
OGAWA Hirofumi05eb0b52006-01-08 01:02:13 -080015#include <linux/writeback.h>
Andrew Morton3fcfab12006-10-19 23:28:16 -070016#include <linux/backing-dev.h>
Chris Masonae78bf92006-09-29 02:00:03 -070017#include <linux/blkdev.h>
Miklos Szeredib1da47e2008-07-01 15:01:28 +020018#include <linux/fsnotify.h>
19#include <linux/security.h>
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080020#include "fat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Christoph Hellwig21bea492009-06-08 21:38:31 +090022static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
23{
24 u32 attr;
25
26 mutex_lock(&inode->i_mutex);
27 attr = fat_make_attrs(inode);
28 mutex_unlock(&inode->i_mutex);
29
30 return put_user(attr, user_attr);
31}
32
33static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
34{
Al Viro496ad9a2013-01-23 17:07:38 -050035 struct inode *inode = file_inode(file);
Christoph Hellwig21bea492009-06-08 21:38:31 +090036 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
37 int is_dir = S_ISDIR(inode->i_mode);
38 u32 attr, oldattr;
39 struct iattr ia;
40 int err;
41
42 err = get_user(attr, user_attr);
43 if (err)
44 goto out;
45
Al Viroa561be72011-11-23 11:57:51 -050046 err = mnt_want_write_file(file);
Christoph Hellwig21bea492009-06-08 21:38:31 +090047 if (err)
Jan Karae24f17d2012-06-12 16:20:31 +020048 goto out;
49 mutex_lock(&inode->i_mutex);
Christoph Hellwig21bea492009-06-08 21:38:31 +090050
51 /*
52 * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
53 * prevents the user from turning us into a VFAT
54 * longname entry. Also, we obviously can't set
55 * any of the NTFS attributes in the high 24 bits.
56 */
57 attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
58 /* Merge in ATTR_VOLUME and ATTR_DIR */
59 attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
60 (is_dir ? ATTR_DIR : 0);
61 oldattr = fat_make_attrs(inode);
62
63 /* Equivalent to a chmod() */
64 ia.ia_valid = ATTR_MODE | ATTR_CTIME;
65 ia.ia_ctime = current_fs_time(inode->i_sb);
66 if (is_dir)
67 ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
68 else {
69 ia.ia_mode = fat_make_mode(sbi, attr,
70 S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
71 }
72
73 /* The root directory has no attributes */
74 if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
75 err = -EINVAL;
Jan Karae24f17d2012-06-12 16:20:31 +020076 goto out_unlock_inode;
Christoph Hellwig21bea492009-06-08 21:38:31 +090077 }
78
79 if (sbi->options.sys_immutable &&
80 ((attr | oldattr) & ATTR_SYS) &&
81 !capable(CAP_LINUX_IMMUTABLE)) {
82 err = -EPERM;
Jan Karae24f17d2012-06-12 16:20:31 +020083 goto out_unlock_inode;
Christoph Hellwig21bea492009-06-08 21:38:31 +090084 }
85
86 /*
87 * The security check is questionable... We single
88 * out the RO attribute for checking by the security
89 * module, just because it maps to a file mode.
90 */
91 err = security_inode_setattr(file->f_path.dentry, &ia);
92 if (err)
Jan Karae24f17d2012-06-12 16:20:31 +020093 goto out_unlock_inode;
Christoph Hellwig21bea492009-06-08 21:38:31 +090094
95 /* This MUST be done before doing anything irreversible... */
96 err = fat_setattr(file->f_path.dentry, &ia);
97 if (err)
Jan Karae24f17d2012-06-12 16:20:31 +020098 goto out_unlock_inode;
Christoph Hellwig21bea492009-06-08 21:38:31 +090099
100 fsnotify_change(file->f_path.dentry, ia.ia_valid);
101 if (sbi->options.sys_immutable) {
102 if (attr & ATTR_SYS)
103 inode->i_flags |= S_IMMUTABLE;
104 else
OGAWA Hirofumi1adffba2011-05-31 19:38:07 +0900105 inode->i_flags &= ~S_IMMUTABLE;
Christoph Hellwig21bea492009-06-08 21:38:31 +0900106 }
107
108 fat_save_attrs(inode, attr);
109 mark_inode_dirty(inode);
Christoph Hellwig21bea492009-06-08 21:38:31 +0900110out_unlock_inode:
111 mutex_unlock(&inode->i_mutex);
Jan Karae24f17d2012-06-12 16:20:31 +0200112 mnt_drop_write_file(file);
Christoph Hellwig21bea492009-06-08 21:38:31 +0900113out:
114 return err;
115}
116
Mike Lockwood6e5b93e2013-07-08 16:00:46 -0700117static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr)
118{
119 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
120 return put_user(sbi->vol_id, user_attr);
121}
122
Arnd Bergmann7845bc3e2010-05-17 08:13:47 +0900123long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Al Viro496ad9a2013-01-23 17:07:38 -0500125 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 u32 __user *user_attr = (u32 __user *)arg;
127
128 switch (cmd) {
129 case FAT_IOCTL_GET_ATTRIBUTES:
Christoph Hellwig21bea492009-06-08 21:38:31 +0900130 return fat_ioctl_get_attributes(inode, user_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 case FAT_IOCTL_SET_ATTRIBUTES:
Christoph Hellwig21bea492009-06-08 21:38:31 +0900132 return fat_ioctl_set_attributes(filp, user_attr);
Mike Lockwood6e5b93e2013-07-08 16:00:46 -0700133 case FAT_IOCTL_GET_VOLUME_ID:
134 return fat_ioctl_get_volume_id(inode, user_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 default:
136 return -ENOTTY; /* Inappropriate ioctl for device */
137 }
138}
139
Arnd Bergmann7845bc3e2010-05-17 08:13:47 +0900140#ifdef CONFIG_COMPAT
141static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd,
142 unsigned long arg)
143
144{
145 return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
146}
147#endif
148
Chris Masonae78bf92006-09-29 02:00:03 -0700149static int fat_file_release(struct inode *inode, struct file *filp)
150{
151 if ((filp->f_mode & FMODE_WRITE) &&
152 MSDOS_SB(inode->i_sb)->options.flush) {
153 fat_flush_inodes(inode->i_sb, inode, NULL);
Jens Axboe8aa7e842009-07-09 14:52:32 +0200154 congestion_wait(BLK_RW_ASYNC, HZ/10);
Chris Masonae78bf92006-09-29 02:00:03 -0700155 }
156 return 0;
157}
158
Josef Bacik02c24a82011-07-16 20:44:56 -0400159int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
Al Virob5224122009-06-07 13:44:36 -0400160{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200161 struct inode *inode = filp->f_mapping->host;
Al Virob5224122009-06-07 13:44:36 -0400162 int res, err;
163
Josef Bacik02c24a82011-07-16 20:44:56 -0400164 res = generic_file_fsync(filp, start, end, datasync);
Al Virob5224122009-06-07 13:44:36 -0400165 err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
166
167 return res ? res : err;
168}
169
170
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800171const struct file_operations fat_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 .llseek = generic_file_llseek,
173 .read = do_sync_read,
174 .write = do_sync_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 .aio_read = generic_file_aio_read,
OGAWA Hirofumief402262005-09-16 19:28:13 -0700176 .aio_write = generic_file_aio_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 .mmap = generic_file_mmap,
Chris Masonae78bf92006-09-29 02:00:03 -0700178 .release = fat_file_release,
Arnd Bergmann7845bc3e2010-05-17 08:13:47 +0900179 .unlocked_ioctl = fat_generic_ioctl,
180#ifdef CONFIG_COMPAT
181 .compat_ioctl = fat_generic_compat_ioctl,
182#endif
Al Virob5224122009-06-07 13:44:36 -0400183 .fsync = fat_file_fsync,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +0200184 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185};
186
OGAWA Hirofumi05eb0b52006-01-08 01:02:13 -0800187static int fat_cont_expand(struct inode *inode, loff_t size)
188{
189 struct address_space *mapping = inode->i_mapping;
190 loff_t start = inode->i_size, count = size - inode->i_size;
191 int err;
192
193 err = generic_cont_expand_simple(inode, size);
194 if (err)
195 goto out;
196
197 inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
198 mark_inode_dirty(inode);
Jan Kara2f3d6752009-08-17 17:00:02 +0200199 if (IS_SYNC(inode)) {
200 int err2;
201
202 /*
203 * Opencode syncing since we don't have a file open to use
204 * standard fsync path.
205 */
206 err = filemap_fdatawrite_range(mapping, start,
207 start + count - 1);
208 err2 = sync_mapping_buffers(mapping);
209 if (!err)
210 err = err2;
211 err2 = write_inode_now(inode, 1);
212 if (!err)
213 err = err2;
214 if (!err) {
215 err = filemap_fdatawait_range(mapping, start,
216 start + count - 1);
217 }
218 }
OGAWA Hirofumi05eb0b52006-01-08 01:02:13 -0800219out:
220 return err;
221}
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223/* Free all clusters after the skip'th cluster. */
224static int fat_free(struct inode *inode, int skip)
225{
226 struct super_block *sb = inode->i_sb;
227 int err, wait, free_start, i_start, i_logstart;
228
229 if (MSDOS_I(inode)->i_start == 0)
230 return 0;
231
OGAWA Hirofumi3b641402006-02-03 03:04:44 -0800232 fat_cache_inval_inode(inode);
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 wait = IS_DIRSYNC(inode);
OGAWA Hirofumi3b641402006-02-03 03:04:44 -0800235 i_start = free_start = MSDOS_I(inode)->i_start;
236 i_logstart = MSDOS_I(inode)->i_logstart;
237
238 /* First, we write the new file size. */
239 if (!skip) {
240 MSDOS_I(inode)->i_start = 0;
241 MSDOS_I(inode)->i_logstart = 0;
242 }
243 MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
244 inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
245 if (wait) {
246 err = fat_sync_inode(inode);
247 if (err) {
248 MSDOS_I(inode)->i_start = i_start;
249 MSDOS_I(inode)->i_logstart = i_logstart;
250 return err;
251 }
252 } else
253 mark_inode_dirty(inode);
254
255 /* Write a new EOF, and get the remaining cluster chain for freeing. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 if (skip) {
257 struct fat_entry fatent;
258 int ret, fclus, dclus;
259
260 ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
261 if (ret < 0)
262 return ret;
263 else if (ret == FAT_ENT_EOF)
264 return 0;
265
266 fatent_init(&fatent);
267 ret = fat_ent_read(inode, &fatent, dclus);
268 if (ret == FAT_ENT_EOF) {
269 fatent_brelse(&fatent);
270 return 0;
271 } else if (ret == FAT_ENT_FREE) {
Denis Karpov85c78592009-06-04 02:34:22 +0900272 fat_fs_error(sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 "%s: invalid cluster chain (i_pos %lld)",
Harvey Harrison8e24eea2008-04-30 00:55:09 -0700274 __func__, MSDOS_I(inode)->i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 ret = -EIO;
276 } else if (ret > 0) {
277 err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
278 if (err)
279 ret = err;
280 }
281 fatent_brelse(&fatent);
282 if (ret < 0)
283 return ret;
284
285 free_start = ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
288
289 /* Freeing the remained cluster chain */
290 return fat_free_clusters(inode, free_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000293void fat_truncate_blocks(struct inode *inode, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Jonathan Corbet9c206162008-05-29 17:14:05 -0600295 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 const unsigned int cluster_size = sbi->cluster_size;
297 int nr_clusters;
298
299 /*
300 * This protects against truncating a file bigger than it was then
301 * trying to write into the hole.
302 */
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000303 if (MSDOS_I(inode)->mmu_private > offset)
304 MSDOS_I(inode)->mmu_private = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000306 nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 fat_free(inode, nr_clusters);
Chris Masonae78bf92006-09-29 02:00:03 -0700309 fat_flush_inodes(inode->i_sb, inode, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
OGAWA Hirofumida63fc72006-11-16 01:19:28 -0800312int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
313{
314 struct inode *inode = dentry->d_inode;
315 generic_fillattr(inode, stat);
316 stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
Namjae Jeonea3983a2013-04-29 16:21:11 -0700317
318 if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) {
319 /* Use i_pos for ino. This is used as fileid of nfs. */
320 stat->ino = fat_i_pos_read(MSDOS_SB(inode->i_sb), inode);
321 }
OGAWA Hirofumida63fc72006-11-16 01:19:28 -0800322 return 0;
323}
324EXPORT_SYMBOL_GPL(fat_getattr);
325
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700326static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
327 struct inode *inode, umode_t *mode_ptr)
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700328{
Al Virodacd0e72011-07-26 03:21:30 -0400329 umode_t mask, perm;
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700330
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700331 /*
332 * Note, the basic check is already done by a caller of
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800333 * (attr->ia_mode & ~FAT_VALID_MODE)
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700334 */
335
336 if (S_ISREG(inode->i_mode))
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700337 mask = sbi->options.fs_fmask;
338 else
339 mask = sbi->options.fs_dmask;
340
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700341 perm = *mode_ptr & ~(S_IFMT | mask);
342
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700343 /*
344 * Of the r and x bits, all (subject to umask) must be present. Of the
345 * w bits, either all (subject to umask) or none must be present.
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800346 *
347 * If fat_mode_can_hold_ro(inode) is false, can't change w bits.
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700348 */
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700349 if ((perm & (S_IRUGO | S_IXUGO)) != (inode->i_mode & (S_IRUGO|S_IXUGO)))
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700350 return -EPERM;
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800351 if (fat_mode_can_hold_ro(inode)) {
352 if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask)))
353 return -EPERM;
354 } else {
355 if ((perm & S_IWUGO) != (S_IWUGO & ~mask))
356 return -EPERM;
357 }
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700358
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700359 *mode_ptr &= S_IFMT | perm;
360
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700361 return 0;
362}
363
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700364static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
365{
Al Virodacd0e72011-07-26 03:21:30 -0400366 umode_t allow_utime = sbi->options.allow_utime;
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700367
Eric W. Biederman170782e2012-02-07 16:25:39 -0800368 if (!uid_eq(current_fsuid(), inode->i_uid)) {
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700369 if (in_group_p(inode->i_gid))
370 allow_utime >>= 3;
371 if (allow_utime & MAY_WRITE)
372 return 1;
373 }
374
375 /* use a default check */
376 return 0;
377}
378
OGAWA Hirofumi17263842008-08-02 13:59:37 +0900379#define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800380/* valid file mode bits */
381#define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO)
OGAWA Hirofumi17263842008-08-02 13:59:37 +0900382
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700383int fat_setattr(struct dentry *dentry, struct iattr *attr)
384{
385 struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
386 struct inode *inode = dentry->d_inode;
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700387 unsigned int ia_valid;
OGAWA Hirofumidfc209c2008-11-06 12:53:55 -0800388 int error;
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700389
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700390 /* Check for setting the inode time. */
391 ia_valid = attr->ia_valid;
OGAWA Hirofumi17263842008-08-02 13:59:37 +0900392 if (ia_valid & TIMES_SET_FLAGS) {
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700393 if (fat_allow_set_time(sbi, inode))
OGAWA Hirofumi17263842008-08-02 13:59:37 +0900394 attr->ia_valid &= ~TIMES_SET_FLAGS;
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700395 }
396
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700397 error = inode_change_ok(inode, attr);
OGAWA Hirofumi1ae43f82008-04-28 02:16:26 -0700398 attr->ia_valid = ia_valid;
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700399 if (error) {
400 if (sbi->options.quiet)
401 error = 0;
402 goto out;
403 }
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700404
Christoph Hellwigdb78b872010-06-04 11:30:03 +0200405 /*
406 * Expand the file. Since inode_setattr() updates ->i_size
407 * before calling the ->truncate(), but FAT needs to fill the
408 * hole before it. XXX: this is no longer true with new truncate
409 * sequence.
410 */
411 if (attr->ia_valid & ATTR_SIZE) {
Christoph Hellwig562c72a2011-06-24 14:29:45 -0400412 inode_dio_wait(inode);
413
Christoph Hellwigdb78b872010-06-04 11:30:03 +0200414 if (attr->ia_size > inode->i_size) {
415 error = fat_cont_expand(inode, attr->ia_size);
416 if (error || attr->ia_valid == ATTR_SIZE)
417 goto out;
418 attr->ia_valid &= ~ATTR_SIZE;
419 }
420 }
421
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700422 if (((attr->ia_valid & ATTR_UID) &&
Eric W. Biederman170782e2012-02-07 16:25:39 -0800423 (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700424 ((attr->ia_valid & ATTR_GID) &&
Eric W. Biederman170782e2012-02-07 16:25:39 -0800425 (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
OGAWA Hirofumie97e8de2008-04-28 02:16:26 -0700426 ((attr->ia_valid & ATTR_MODE) &&
OGAWA Hirofumi9c0aa1b2008-11-06 12:53:54 -0800427 (attr->ia_mode & ~FAT_VALID_MODE)))
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700428 error = -EPERM;
429
430 if (error) {
431 if (sbi->options.quiet)
432 error = 0;
433 goto out;
434 }
435
OGAWA Hirofumi2d518f82008-06-12 15:21:28 -0700436 /*
437 * We don't return -EPERM here. Yes, strange, but this is too
438 * old behavior.
439 */
440 if (attr->ia_valid & ATTR_MODE) {
441 if (fat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
442 attr->ia_valid &= ~ATTR_MODE;
443 }
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700444
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000445 if (attr->ia_valid & ATTR_SIZE) {
Christoph Hellwig58268692011-06-24 14:29:40 -0400446 down_write(&MSDOS_I(inode)->truncate_lock);
Christoph Hellwig2c27c652010-06-04 11:30:04 +0200447 truncate_setsize(inode, attr->ia_size);
448 fat_truncate_blocks(inode, attr->ia_size);
Christoph Hellwig58268692011-06-24 14:29:40 -0400449 up_write(&MSDOS_I(inode)->truncate_lock);
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000450 }
451
Christoph Hellwig6a1a90a2010-06-04 11:30:00 +0200452 setattr_copy(inode, attr);
npiggin@suse.de459f6ed2010-05-27 01:05:38 +1000453 mark_inode_dirty(inode);
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700454out:
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700455 return error;
456}
457EXPORT_SYMBOL_GPL(fat_setattr);
458
Arjan van de Ven754661f2007-02-12 00:55:38 -0800459const struct inode_operations fat_file_inode_operations = {
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -0700460 .setattr = fat_setattr,
OGAWA Hirofumida63fc72006-11-16 01:19:28 -0800461 .getattr = fat_getattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462};