Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
4 */
5
6#include <linux/slab.h>
7#include <linux/compat.h>
8#include <linux/cred.h>
9#include <linux/buffer_head.h>
10#include <linux/blkdev.h>
11#include <linux/fsnotify.h>
12#include <linux/security.h>
13#include <linux/msdos_fs.h>
14#include <linux/writeback.h>
15
16#include "exfat_raw.h"
17#include "exfat_fs.h"
18
19static int exfat_cont_expand(struct inode *inode, loff_t size)
20{
21 int ret;
22 unsigned int num_clusters, new_num_clusters, last_clu;
23 struct exfat_inode_info *ei = EXFAT_I(inode);
24 struct super_block *sb = inode->i_sb;
25 struct exfat_sb_info *sbi = EXFAT_SB(sb);
26 struct exfat_chain clu;
27
28 ret = inode_newsize_ok(inode, size);
29 if (ret)
30 return ret;
31
32 num_clusters = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
33 new_num_clusters = EXFAT_B_TO_CLU_ROUND_UP(size, sbi);
34
35 if (new_num_clusters == num_clusters)
36 goto out;
37
38 if (num_clusters) {
39 exfat_chain_set(&clu, ei->start_clu, num_clusters, ei->flags);
40 ret = exfat_find_last_cluster(sb, &clu, &last_clu);
41 if (ret)
42 return ret;
43
44 clu.dir = last_clu + 1;
45 } else {
46 last_clu = EXFAT_EOF_CLUSTER;
47 clu.dir = EXFAT_EOF_CLUSTER;
48 }
49
50 clu.size = 0;
51 clu.flags = ei->flags;
52
53 ret = exfat_alloc_cluster(inode, new_num_clusters - num_clusters,
54 &clu, inode_needs_sync(inode));
55 if (ret)
56 return ret;
57
58 /* Append new clusters to chain */
59 if (num_clusters) {
60 if (clu.flags != ei->flags)
61 if (exfat_chain_cont_cluster(sb, ei->start_clu, num_clusters))
62 goto free_clu;
63
64 if (clu.flags == ALLOC_FAT_CHAIN)
65 if (exfat_ent_set(sb, last_clu, clu.dir))
66 goto free_clu;
67 } else
68 ei->start_clu = clu.dir;
69
70 ei->flags = clu.flags;
71
72out:
73 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
74 /* Expanded range not zeroed, do not update valid_size */
75 i_size_write(inode, size);
76
77 ei->i_size_aligned = round_up(size, sb->s_blocksize);
78 ei->i_size_ondisk = ei->i_size_aligned;
79 inode->i_blocks = round_up(size, sbi->cluster_size) >> 9;
80 mark_inode_dirty(inode);
81
82 if (IS_SYNC(inode))
83 return write_inode_now(inode, 1);
84
85 return 0;
86
87free_clu:
88 exfat_free_cluster(inode, &clu);
89 return -EIO;
90}
91
92static bool exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
93{
94 mode_t allow_utime = sbi->options.allow_utime;
95
96 if (!uid_eq(current_fsuid(), inode->i_uid)) {
97 if (in_group_p(inode->i_gid))
98 allow_utime >>= 3;
99 if (allow_utime & MAY_WRITE)
100 return true;
101 }
102
103 /* use a default check */
104 return false;
105}
106
107static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
108 struct inode *inode, umode_t *mode_ptr)
109{
110 mode_t i_mode, mask, perm;
111
112 i_mode = inode->i_mode;
113
114 mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ?
115 sbi->options.fs_fmask : sbi->options.fs_dmask;
116 perm = *mode_ptr & ~(S_IFMT | mask);
117
118 /* Of the r and x bits, all (subject to umask) must be present.*/
119 if ((perm & 0555) != (i_mode & 0555))
120 return -EPERM;
121
122 if (exfat_mode_can_hold_ro(inode)) {
123 /*
124 * Of the w bits, either all (subject to umask) or none must
125 * be present.
126 */
127 if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
128 return -EPERM;
129 } else {
130 /*
131 * If exfat_mode_can_hold_ro(inode) is false, can't change
132 * w bits.
133 */
134 if ((perm & 0222) != (0222 & ~mask))
135 return -EPERM;
136 }
137
138 *mode_ptr &= S_IFMT | perm;
139
140 return 0;
141}
142
143/* resize the file length */
144int __exfat_truncate(struct inode *inode)
145{
146 unsigned int num_clusters_new, num_clusters_phys;
147 unsigned int last_clu = EXFAT_FREE_CLUSTER;
148 struct exfat_chain clu;
149 struct super_block *sb = inode->i_sb;
150 struct exfat_sb_info *sbi = EXFAT_SB(sb);
151 struct exfat_inode_info *ei = EXFAT_I(inode);
152
153 /* check if the given file ID is opened */
154 if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
155 return -EPERM;
156
157 exfat_set_volume_dirty(sb);
158
159 num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
160 num_clusters_phys = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
161
162 exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
163
164 if (i_size_read(inode) > 0) {
165 /*
166 * Truncate FAT chain num_clusters after the first cluster
167 * num_clusters = min(new, phys);
168 */
169 unsigned int num_clusters =
170 min(num_clusters_new, num_clusters_phys);
171
172 /*
173 * Follow FAT chain
174 * (defensive coding - works fine even with corrupted FAT table
175 */
176 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
177 clu.dir += num_clusters;
178 clu.size -= num_clusters;
179 } else {
180 while (num_clusters > 0) {
181 last_clu = clu.dir;
182 if (exfat_get_next_cluster(sb, &(clu.dir)))
183 return -EIO;
184
185 num_clusters--;
186 clu.size--;
187 }
188 }
189 } else {
190 ei->flags = ALLOC_NO_FAT_CHAIN;
191 ei->start_clu = EXFAT_EOF_CLUSTER;
192 }
193
194 if (i_size_read(inode) < ei->valid_size)
195 ei->valid_size = i_size_read(inode);
196
197 if (ei->type == TYPE_FILE)
198 ei->attr |= EXFAT_ATTR_ARCHIVE;
199
200 /*
201 * update the directory entry
202 *
203 * If the directory entry is updated by mark_inode_dirty(), the
204 * directory entry will be written after a writeback cycle of
205 * updating the bitmap/FAT, which may result in clusters being
206 * freed but referenced by the directory entry in the event of a
207 * sudden power failure.
208 * __exfat_write_inode() is called for directory entry, bitmap
209 * and FAT to be written in a same writeback.
210 */
211 if (__exfat_write_inode(inode, inode_needs_sync(inode)))
212 return -EIO;
213
214 /* cut off from the FAT chain */
215 if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
216 last_clu != EXFAT_EOF_CLUSTER) {
217 if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
218 return -EIO;
219 }
220
221 /* invalidate cache and free the clusters */
222 /* clear exfat cache */
223 exfat_cache_inval_inode(inode);
224
225 /* hint information */
226 ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
227 ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
228
229 /* hint_stat will be used if this is directory. */
230 ei->hint_stat.eidx = 0;
231 ei->hint_stat.clu = ei->start_clu;
232 ei->hint_femp.eidx = EXFAT_HINT_NONE;
233
234 /* free the clusters */
235 if (exfat_free_cluster(inode, &clu))
236 return -EIO;
237
238 return 0;
239}
240
241void exfat_truncate(struct inode *inode)
242{
243 struct super_block *sb = inode->i_sb;
244 struct exfat_sb_info *sbi = EXFAT_SB(sb);
245 struct exfat_inode_info *ei = EXFAT_I(inode);
246 unsigned int blocksize = i_blocksize(inode);
247 loff_t aligned_size;
248 int err;
249
250 mutex_lock(&sbi->s_lock);
251 if (ei->start_clu == 0) {
252 /*
253 * Empty start_clu != ~0 (not allocated)
254 */
255 exfat_fs_error(sb, "tried to truncate zeroed cluster.");
256 goto write_size;
257 }
258
259 err = __exfat_truncate(inode);
260 if (err)
261 goto write_size;
262
263 inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
264write_size:
265 aligned_size = i_size_read(inode);
266 if (aligned_size & (blocksize - 1)) {
267 aligned_size |= (blocksize - 1);
268 aligned_size++;
269 }
270
271 if (ei->i_size_ondisk > i_size_read(inode))
272 ei->i_size_ondisk = aligned_size;
273
274 if (ei->i_size_aligned > i_size_read(inode))
275 ei->i_size_aligned = aligned_size;
276 mutex_unlock(&sbi->s_lock);
277}
278
279int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
280 struct kstat *stat, unsigned int request_mask,
281 unsigned int query_flags)
282{
283 struct inode *inode = d_backing_inode(path->dentry);
284 struct exfat_inode_info *ei = EXFAT_I(inode);
285
286 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
287 exfat_truncate_atime(&stat->atime);
288 stat->result_mask |= STATX_BTIME;
289 stat->btime.tv_sec = ei->i_crtime.tv_sec;
290 stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
291 stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
292 return 0;
293}
294
295int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
296 struct iattr *attr)
297{
298 struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
299 struct inode *inode = dentry->d_inode;
300 unsigned int ia_valid;
301 int error;
302
303 if ((attr->ia_valid & ATTR_SIZE) &&
304 attr->ia_size > i_size_read(inode)) {
305 error = exfat_cont_expand(inode, attr->ia_size);
306 if (error || attr->ia_valid == ATTR_SIZE)
307 return error;
308 attr->ia_valid &= ~ATTR_SIZE;
309 }
310
311 /* Check for setting the inode time. */
312 ia_valid = attr->ia_valid;
313 if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
314 exfat_allow_set_time(sbi, inode)) {
315 attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
316 ATTR_TIMES_SET);
317 }
318
319 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
320 attr->ia_valid = ia_valid;
321 if (error)
322 goto out;
323
324 if (((attr->ia_valid & ATTR_UID) &&
325 !uid_eq(attr->ia_uid, sbi->options.fs_uid)) ||
326 ((attr->ia_valid & ATTR_GID) &&
327 !gid_eq(attr->ia_gid, sbi->options.fs_gid)) ||
328 ((attr->ia_valid & ATTR_MODE) &&
329 (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
330 error = -EPERM;
331 goto out;
332 }
333
334 /*
335 * We don't return -EPERM here. Yes, strange, but this is too
336 * old behavior.
337 */
338 if (attr->ia_valid & ATTR_MODE) {
339 if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
340 attr->ia_valid &= ~ATTR_MODE;
341 }
342
343 if (attr->ia_valid & ATTR_SIZE)
344 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
345
346 setattr_copy(&nop_mnt_idmap, inode, attr);
347 exfat_truncate_inode_atime(inode);
348
349 if (attr->ia_valid & ATTR_SIZE) {
350 error = exfat_block_truncate_page(inode, attr->ia_size);
351 if (error)
352 goto out;
353
354 down_write(&EXFAT_I(inode)->truncate_lock);
355 truncate_setsize(inode, attr->ia_size);
356
357 /*
358 * __exfat_write_inode() is called from exfat_truncate(), inode
359 * is already written by it, so mark_inode_dirty() is unneeded.
360 */
361 exfat_truncate(inode);
362 up_write(&EXFAT_I(inode)->truncate_lock);
363 } else
364 mark_inode_dirty(inode);
365
366out:
367 return error;
368}
369
370/*
371 * modified ioctls from fat/file.c by Welmer Almesberger
372 */
373static int exfat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
374{
375 u32 attr;
376
377 inode_lock_shared(inode);
378 attr = exfat_make_attr(inode);
379 inode_unlock_shared(inode);
380
381 return put_user(attr, user_attr);
382}
383
384static int exfat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
385{
386 struct inode *inode = file_inode(file);
387 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
388 int is_dir = S_ISDIR(inode->i_mode);
389 u32 attr, oldattr;
390 struct iattr ia;
391 int err;
392
393 err = get_user(attr, user_attr);
394 if (err)
395 goto out;
396
397 err = mnt_want_write_file(file);
398 if (err)
399 goto out;
400 inode_lock(inode);
401
402 oldattr = exfat_make_attr(inode);
403
404 /*
405 * Mask attributes so we don't set reserved fields.
406 */
407 attr &= (EXFAT_ATTR_READONLY | EXFAT_ATTR_HIDDEN | EXFAT_ATTR_SYSTEM |
408 EXFAT_ATTR_ARCHIVE);
409 attr |= (is_dir ? EXFAT_ATTR_SUBDIR : 0);
410
411 /* Equivalent to a chmod() */
412 ia.ia_valid = ATTR_MODE | ATTR_CTIME;
413 ia.ia_ctime = current_time(inode);
414 if (is_dir)
415 ia.ia_mode = exfat_make_mode(sbi, attr, 0777);
416 else
417 ia.ia_mode = exfat_make_mode(sbi, attr, 0666 | (inode->i_mode & 0111));
418
419 /* The root directory has no attributes */
420 if (inode->i_ino == EXFAT_ROOT_INO && attr != EXFAT_ATTR_SUBDIR) {
421 err = -EINVAL;
422 goto out_unlock_inode;
423 }
424
425 if (((attr | oldattr) & EXFAT_ATTR_SYSTEM) &&
426 !capable(CAP_LINUX_IMMUTABLE)) {
427 err = -EPERM;
428 goto out_unlock_inode;
429 }
430
431 /*
432 * The security check is questionable... We single
433 * out the RO attribute for checking by the security
434 * module, just because it maps to a file mode.
435 */
436 err = security_inode_setattr(file_mnt_idmap(file),
437 file->f_path.dentry, &ia);
438 if (err)
439 goto out_unlock_inode;
440
441 /* This MUST be done before doing anything irreversible... */
442 err = exfat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia);
443 if (err)
444 goto out_unlock_inode;
445
446 fsnotify_change(file->f_path.dentry, ia.ia_valid);
447
448 exfat_save_attr(inode, attr);
449 mark_inode_dirty(inode);
450out_unlock_inode:
451 inode_unlock(inode);
452 mnt_drop_write_file(file);
453out:
454 return err;
455}
456
457static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
458{
459 struct fstrim_range range;
460 int ret = 0;
461
462 if (!capable(CAP_SYS_ADMIN))
463 return -EPERM;
464
465 if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
466 return -EOPNOTSUPP;
467
468 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
469 return -EFAULT;
470
471 range.minlen = max_t(unsigned int, range.minlen,
472 bdev_discard_granularity(inode->i_sb->s_bdev));
473
474 ret = exfat_trim_fs(inode, &range);
475 if (ret < 0)
476 return ret;
477
478 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
479 return -EFAULT;
480
481 return 0;
482}
483
484long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
485{
486 struct inode *inode = file_inode(filp);
487 u32 __user *user_attr = (u32 __user *)arg;
488
489 switch (cmd) {
490 case FAT_IOCTL_GET_ATTRIBUTES:
491 return exfat_ioctl_get_attributes(inode, user_attr);
492 case FAT_IOCTL_SET_ATTRIBUTES:
493 return exfat_ioctl_set_attributes(filp, user_attr);
494 case FITRIM:
495 return exfat_ioctl_fitrim(inode, arg);
496 default:
497 return -ENOTTY;
498 }
499}
500
501#ifdef CONFIG_COMPAT
502long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
503 unsigned long arg)
504{
505 return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
506}
507#endif
508
509int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
510{
511 struct inode *inode = filp->f_mapping->host;
512 int err;
513
514 err = __generic_file_fsync(filp, start, end, datasync);
515 if (err)
516 return err;
517
518 err = sync_blockdev(inode->i_sb->s_bdev);
519 if (err)
520 return err;
521
522 return blkdev_issue_flush(inode->i_sb->s_bdev);
523}
524
525static int exfat_file_zeroed_range(struct file *file, loff_t start, loff_t end)
526{
527 int err;
528 struct inode *inode = file_inode(file);
529 struct address_space *mapping = inode->i_mapping;
530 const struct address_space_operations *ops = mapping->a_ops;
531
532 while (start < end) {
533 u32 zerofrom, len;
534 struct page *page = NULL;
535
536 zerofrom = start & (PAGE_SIZE - 1);
537 len = PAGE_SIZE - zerofrom;
538 if (start + len > end)
539 len = end - start;
540
541 err = ops->write_begin(file, mapping, start, len, &page, NULL);
542 if (err)
543 goto out;
544
545 zero_user_segment(page, zerofrom, zerofrom + len);
546
547 err = ops->write_end(file, mapping, start, len, len, page, NULL);
548 if (err < 0)
549 goto out;
550 start += len;
551
552 balance_dirty_pages_ratelimited(mapping);
553 cond_resched();
554 }
555
556out:
557 return err;
558}
559
560static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
561{
562 ssize_t ret;
563 struct file *file = iocb->ki_filp;
564 struct inode *inode = file_inode(file);
565 struct exfat_inode_info *ei = EXFAT_I(inode);
566 loff_t pos = iocb->ki_pos;
567 loff_t valid_size;
568
569 inode_lock(inode);
570
571 valid_size = ei->valid_size;
572
573 ret = generic_write_checks(iocb, iter);
574 if (ret < 0)
575 goto unlock;
576
577 if (pos > valid_size) {
578 ret = exfat_file_zeroed_range(file, valid_size, pos);
579 if (ret < 0 && ret != -ENOSPC) {
580 exfat_err(inode->i_sb,
581 "write: fail to zero from %llu to %llu(%zd)",
582 valid_size, pos, ret);
583 }
584 if (ret < 0)
585 goto unlock;
586 }
587
588 ret = __generic_file_write_iter(iocb, iter);
589 if (ret < 0)
590 goto unlock;
591
592 inode_unlock(inode);
593
594 if (pos > valid_size)
595 pos = valid_size;
596
597 if (iocb_is_dsync(iocb) && iocb->ki_pos > pos) {
598 ssize_t err = vfs_fsync_range(file, pos, iocb->ki_pos - 1,
599 iocb->ki_flags & IOCB_SYNC);
600 if (err < 0)
601 return err;
602 }
603
604 return ret;
605
606unlock:
607 inode_unlock(inode);
608
609 return ret;
610}
611
612static int exfat_file_mmap(struct file *file, struct vm_area_struct *vma)
613{
614 int ret;
615 struct inode *inode = file_inode(file);
616 struct exfat_inode_info *ei = EXFAT_I(inode);
617 loff_t start = ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
618 loff_t end = min_t(loff_t, i_size_read(inode),
619 start + vma->vm_end - vma->vm_start);
620
621 if ((vma->vm_flags & VM_WRITE) && ei->valid_size < end) {
622 ret = exfat_file_zeroed_range(file, ei->valid_size, end);
623 if (ret < 0) {
624 exfat_err(inode->i_sb,
625 "mmap: fail to zero from %llu to %llu(%d)",
626 start, end, ret);
627 return ret;
628 }
629 }
630
631 return generic_file_mmap(file, vma);
632}
633
634const struct file_operations exfat_file_operations = {
635 .llseek = generic_file_llseek,
636 .read_iter = generic_file_read_iter,
637 .write_iter = exfat_file_write_iter,
638 .unlocked_ioctl = exfat_ioctl,
639#ifdef CONFIG_COMPAT
640 .compat_ioctl = exfat_compat_ioctl,
641#endif
642 .mmap = exfat_file_mmap,
643 .fsync = exfat_file_fsync,
644 .splice_read = filemap_splice_read,
645 .splice_write = iter_file_splice_write,
646};
647
648const struct inode_operations exfat_file_inode_operations = {
649 .setattr = exfat_setattr,
650 .getattr = exfat_getattr,
651};
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
4 */
5
6#include <linux/slab.h>
7#include <linux/compat.h>
8#include <linux/cred.h>
9#include <linux/buffer_head.h>
10#include <linux/blkdev.h>
11
12#include "exfat_raw.h"
13#include "exfat_fs.h"
14
15static int exfat_cont_expand(struct inode *inode, loff_t size)
16{
17 struct address_space *mapping = inode->i_mapping;
18 loff_t start = i_size_read(inode), count = size - i_size_read(inode);
19 int err, err2;
20
21 err = generic_cont_expand_simple(inode, size);
22 if (err)
23 return err;
24
25 inode->i_ctime = inode->i_mtime = current_time(inode);
26 mark_inode_dirty(inode);
27
28 if (!IS_SYNC(inode))
29 return 0;
30
31 err = filemap_fdatawrite_range(mapping, start, start + count - 1);
32 err2 = sync_mapping_buffers(mapping);
33 if (!err)
34 err = err2;
35 err2 = write_inode_now(inode, 1);
36 if (!err)
37 err = err2;
38 if (err)
39 return err;
40
41 return filemap_fdatawait_range(mapping, start, start + count - 1);
42}
43
44static bool exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
45{
46 mode_t allow_utime = sbi->options.allow_utime;
47
48 if (!uid_eq(current_fsuid(), inode->i_uid)) {
49 if (in_group_p(inode->i_gid))
50 allow_utime >>= 3;
51 if (allow_utime & MAY_WRITE)
52 return true;
53 }
54
55 /* use a default check */
56 return false;
57}
58
59static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
60 struct inode *inode, umode_t *mode_ptr)
61{
62 mode_t i_mode, mask, perm;
63
64 i_mode = inode->i_mode;
65
66 mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ?
67 sbi->options.fs_fmask : sbi->options.fs_dmask;
68 perm = *mode_ptr & ~(S_IFMT | mask);
69
70 /* Of the r and x bits, all (subject to umask) must be present.*/
71 if ((perm & 0555) != (i_mode & 0555))
72 return -EPERM;
73
74 if (exfat_mode_can_hold_ro(inode)) {
75 /*
76 * Of the w bits, either all (subject to umask) or none must
77 * be present.
78 */
79 if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
80 return -EPERM;
81 } else {
82 /*
83 * If exfat_mode_can_hold_ro(inode) is false, can't change
84 * w bits.
85 */
86 if ((perm & 0222) != (0222 & ~mask))
87 return -EPERM;
88 }
89
90 *mode_ptr &= S_IFMT | perm;
91
92 return 0;
93}
94
95/* resize the file length */
96int __exfat_truncate(struct inode *inode)
97{
98 unsigned int num_clusters_new, num_clusters_phys;
99 unsigned int last_clu = EXFAT_FREE_CLUSTER;
100 struct exfat_chain clu;
101 struct super_block *sb = inode->i_sb;
102 struct exfat_sb_info *sbi = EXFAT_SB(sb);
103 struct exfat_inode_info *ei = EXFAT_I(inode);
104
105 /* check if the given file ID is opened */
106 if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
107 return -EPERM;
108
109 exfat_set_volume_dirty(sb);
110
111 num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
112 num_clusters_phys = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
113
114 exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
115
116 if (i_size_read(inode) > 0) {
117 /*
118 * Truncate FAT chain num_clusters after the first cluster
119 * num_clusters = min(new, phys);
120 */
121 unsigned int num_clusters =
122 min(num_clusters_new, num_clusters_phys);
123
124 /*
125 * Follow FAT chain
126 * (defensive coding - works fine even with corrupted FAT table
127 */
128 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
129 clu.dir += num_clusters;
130 clu.size -= num_clusters;
131 } else {
132 while (num_clusters > 0) {
133 last_clu = clu.dir;
134 if (exfat_get_next_cluster(sb, &(clu.dir)))
135 return -EIO;
136
137 num_clusters--;
138 clu.size--;
139 }
140 }
141 } else {
142 ei->flags = ALLOC_NO_FAT_CHAIN;
143 ei->start_clu = EXFAT_EOF_CLUSTER;
144 }
145
146 if (ei->type == TYPE_FILE)
147 ei->attr |= ATTR_ARCHIVE;
148
149 /*
150 * update the directory entry
151 *
152 * If the directory entry is updated by mark_inode_dirty(), the
153 * directory entry will be written after a writeback cycle of
154 * updating the bitmap/FAT, which may result in clusters being
155 * freed but referenced by the directory entry in the event of a
156 * sudden power failure.
157 * __exfat_write_inode() is called for directory entry, bitmap
158 * and FAT to be written in a same writeback.
159 */
160 if (__exfat_write_inode(inode, inode_needs_sync(inode)))
161 return -EIO;
162
163 /* cut off from the FAT chain */
164 if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
165 last_clu != EXFAT_EOF_CLUSTER) {
166 if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
167 return -EIO;
168 }
169
170 /* invalidate cache and free the clusters */
171 /* clear exfat cache */
172 exfat_cache_inval_inode(inode);
173
174 /* hint information */
175 ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
176 ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
177
178 /* hint_stat will be used if this is directory. */
179 ei->hint_stat.eidx = 0;
180 ei->hint_stat.clu = ei->start_clu;
181 ei->hint_femp.eidx = EXFAT_HINT_NONE;
182
183 /* free the clusters */
184 if (exfat_free_cluster(inode, &clu))
185 return -EIO;
186
187 return 0;
188}
189
190void exfat_truncate(struct inode *inode)
191{
192 struct super_block *sb = inode->i_sb;
193 struct exfat_sb_info *sbi = EXFAT_SB(sb);
194 struct exfat_inode_info *ei = EXFAT_I(inode);
195 unsigned int blocksize = i_blocksize(inode);
196 loff_t aligned_size;
197 int err;
198
199 mutex_lock(&sbi->s_lock);
200 if (ei->start_clu == 0) {
201 /*
202 * Empty start_clu != ~0 (not allocated)
203 */
204 exfat_fs_error(sb, "tried to truncate zeroed cluster.");
205 goto write_size;
206 }
207
208 err = __exfat_truncate(inode);
209 if (err)
210 goto write_size;
211
212 inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
213 inode->i_blkbits;
214write_size:
215 aligned_size = i_size_read(inode);
216 if (aligned_size & (blocksize - 1)) {
217 aligned_size |= (blocksize - 1);
218 aligned_size++;
219 }
220
221 if (ei->i_size_ondisk > i_size_read(inode))
222 ei->i_size_ondisk = aligned_size;
223
224 if (ei->i_size_aligned > i_size_read(inode))
225 ei->i_size_aligned = aligned_size;
226 mutex_unlock(&sbi->s_lock);
227}
228
229int exfat_getattr(struct user_namespace *mnt_uerns, const struct path *path,
230 struct kstat *stat, unsigned int request_mask,
231 unsigned int query_flags)
232{
233 struct inode *inode = d_backing_inode(path->dentry);
234 struct exfat_inode_info *ei = EXFAT_I(inode);
235
236 generic_fillattr(&init_user_ns, inode, stat);
237 exfat_truncate_atime(&stat->atime);
238 stat->result_mask |= STATX_BTIME;
239 stat->btime.tv_sec = ei->i_crtime.tv_sec;
240 stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
241 stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
242 return 0;
243}
244
245int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
246 struct iattr *attr)
247{
248 struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
249 struct inode *inode = dentry->d_inode;
250 unsigned int ia_valid;
251 int error;
252
253 if ((attr->ia_valid & ATTR_SIZE) &&
254 attr->ia_size > i_size_read(inode)) {
255 error = exfat_cont_expand(inode, attr->ia_size);
256 if (error || attr->ia_valid == ATTR_SIZE)
257 return error;
258 attr->ia_valid &= ~ATTR_SIZE;
259 }
260
261 /* Check for setting the inode time. */
262 ia_valid = attr->ia_valid;
263 if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
264 exfat_allow_set_time(sbi, inode)) {
265 attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
266 ATTR_TIMES_SET);
267 }
268
269 error = setattr_prepare(&init_user_ns, dentry, attr);
270 attr->ia_valid = ia_valid;
271 if (error)
272 goto out;
273
274 if (((attr->ia_valid & ATTR_UID) &&
275 !uid_eq(attr->ia_uid, sbi->options.fs_uid)) ||
276 ((attr->ia_valid & ATTR_GID) &&
277 !gid_eq(attr->ia_gid, sbi->options.fs_gid)) ||
278 ((attr->ia_valid & ATTR_MODE) &&
279 (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
280 error = -EPERM;
281 goto out;
282 }
283
284 /*
285 * We don't return -EPERM here. Yes, strange, but this is too
286 * old behavior.
287 */
288 if (attr->ia_valid & ATTR_MODE) {
289 if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
290 attr->ia_valid &= ~ATTR_MODE;
291 }
292
293 if (attr->ia_valid & ATTR_SIZE)
294 inode->i_mtime = inode->i_ctime = current_time(inode);
295
296 setattr_copy(&init_user_ns, inode, attr);
297 exfat_truncate_atime(&inode->i_atime);
298
299 if (attr->ia_valid & ATTR_SIZE) {
300 error = exfat_block_truncate_page(inode, attr->ia_size);
301 if (error)
302 goto out;
303
304 down_write(&EXFAT_I(inode)->truncate_lock);
305 truncate_setsize(inode, attr->ia_size);
306
307 /*
308 * __exfat_write_inode() is called from exfat_truncate(), inode
309 * is already written by it, so mark_inode_dirty() is unneeded.
310 */
311 exfat_truncate(inode);
312 up_write(&EXFAT_I(inode)->truncate_lock);
313 } else
314 mark_inode_dirty(inode);
315
316out:
317 return error;
318}
319
320static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
321{
322 struct fstrim_range range;
323 int ret = 0;
324
325 if (!capable(CAP_SYS_ADMIN))
326 return -EPERM;
327
328 if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
329 return -EOPNOTSUPP;
330
331 if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
332 return -EFAULT;
333
334 range.minlen = max_t(unsigned int, range.minlen,
335 bdev_discard_granularity(inode->i_sb->s_bdev));
336
337 ret = exfat_trim_fs(inode, &range);
338 if (ret < 0)
339 return ret;
340
341 if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
342 return -EFAULT;
343
344 return 0;
345}
346
347long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
348{
349 struct inode *inode = file_inode(filp);
350
351 switch (cmd) {
352 case FITRIM:
353 return exfat_ioctl_fitrim(inode, arg);
354 default:
355 return -ENOTTY;
356 }
357}
358
359#ifdef CONFIG_COMPAT
360long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
361 unsigned long arg)
362{
363 return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
364}
365#endif
366
367int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
368{
369 struct inode *inode = filp->f_mapping->host;
370 int err;
371
372 err = __generic_file_fsync(filp, start, end, datasync);
373 if (err)
374 return err;
375
376 err = sync_blockdev(inode->i_sb->s_bdev);
377 if (err)
378 return err;
379
380 return blkdev_issue_flush(inode->i_sb->s_bdev);
381}
382
383const struct file_operations exfat_file_operations = {
384 .llseek = generic_file_llseek,
385 .read_iter = generic_file_read_iter,
386 .write_iter = generic_file_write_iter,
387 .unlocked_ioctl = exfat_ioctl,
388#ifdef CONFIG_COMPAT
389 .compat_ioctl = exfat_compat_ioctl,
390#endif
391 .mmap = generic_file_mmap,
392 .fsync = exfat_file_fsync,
393 .splice_read = generic_file_splice_read,
394 .splice_write = iter_file_splice_write,
395};
396
397const struct inode_operations exfat_file_inode_operations = {
398 .setattr = exfat_setattr,
399 .getattr = exfat_getattr,
400};