1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/init.h>
7 #include <linux/buffer_head.h>
8 #include <linux/mpage.h>
9 #include <linux/bio.h>
10 #include <linux/blkdev.h>
11 #include <linux/time.h>
12 #include <linux/writeback.h>
13 #include <linux/uio.h>
14 #include <linux/random.h>
15 #include <linux/iversion.h>
16
17 #include "exfat_raw.h"
18 #include "exfat_fs.h"
19
__exfat_write_inode(struct inode * inode,int sync)20 int __exfat_write_inode(struct inode *inode, int sync)
21 {
22 unsigned long long on_disk_size;
23 struct exfat_dentry *ep, *ep2;
24 struct exfat_entry_set_cache es;
25 struct super_block *sb = inode->i_sb;
26 struct exfat_sb_info *sbi = EXFAT_SB(sb);
27 struct exfat_inode_info *ei = EXFAT_I(inode);
28 bool is_dir = (ei->type == TYPE_DIR) ? true : false;
29
30 if (inode->i_ino == EXFAT_ROOT_INO)
31 return 0;
32
33 /*
34 * If the inode is already unlinked, there is no need for updating it.
35 */
36 if (ei->dir.dir == DIR_DELETED)
37 return 0;
38
39 if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
40 return 0;
41
42 exfat_set_volume_dirty(sb);
43
44 /* get the directory entry of given file or directory */
45 if (exfat_get_dentry_set(&es, sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES))
46 return -EIO;
47 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
48 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
49
50 ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
51
52 /* set FILE_INFO structure using the acquired struct exfat_dentry */
53 exfat_set_entry_time(sbi, &ei->i_crtime,
54 &ep->dentry.file.create_tz,
55 &ep->dentry.file.create_time,
56 &ep->dentry.file.create_date,
57 &ep->dentry.file.create_time_cs);
58 exfat_set_entry_time(sbi, &inode->i_mtime,
59 &ep->dentry.file.modify_tz,
60 &ep->dentry.file.modify_time,
61 &ep->dentry.file.modify_date,
62 &ep->dentry.file.modify_time_cs);
63 exfat_set_entry_time(sbi, &inode->i_atime,
64 &ep->dentry.file.access_tz,
65 &ep->dentry.file.access_time,
66 &ep->dentry.file.access_date,
67 NULL);
68
69 /* File size should be zero if there is no cluster allocated */
70 on_disk_size = i_size_read(inode);
71
72 if (ei->start_clu == EXFAT_EOF_CLUSTER)
73 on_disk_size = 0;
74
75 ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
76 ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
77 if (on_disk_size) {
78 ep2->dentry.stream.flags = ei->flags;
79 ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu);
80 } else {
81 ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
82 ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
83 }
84
85 exfat_update_dir_chksum_with_entry_set(&es);
86 return exfat_put_dentry_set(&es, sync);
87 }
88
exfat_write_inode(struct inode * inode,struct writeback_control * wbc)89 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
90 {
91 int ret;
92
93 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
94 ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
95 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
96
97 return ret;
98 }
99
exfat_sync_inode(struct inode * inode)100 void exfat_sync_inode(struct inode *inode)
101 {
102 lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
103 __exfat_write_inode(inode, 1);
104 }
105
106 /*
107 * Input: inode, (logical) clu_offset, target allocation area
108 * Output: errcode, cluster number
109 * *clu = (~0), if it's unable to allocate a new cluster
110 */
exfat_map_cluster(struct inode * inode,unsigned int clu_offset,unsigned int * clu,int create)111 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
112 unsigned int *clu, int create)
113 {
114 int ret;
115 unsigned int last_clu;
116 struct exfat_chain new_clu;
117 struct super_block *sb = inode->i_sb;
118 struct exfat_sb_info *sbi = EXFAT_SB(sb);
119 struct exfat_inode_info *ei = EXFAT_I(inode);
120 unsigned int local_clu_offset = clu_offset;
121 unsigned int num_to_be_allocated = 0, num_clusters = 0;
122
123 if (ei->i_size_ondisk > 0)
124 num_clusters =
125 EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
126
127 if (clu_offset >= num_clusters)
128 num_to_be_allocated = clu_offset - num_clusters + 1;
129
130 if (!create && (num_to_be_allocated > 0)) {
131 *clu = EXFAT_EOF_CLUSTER;
132 return 0;
133 }
134
135 *clu = last_clu = ei->start_clu;
136
137 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
138 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
139 last_clu += clu_offset - 1;
140
141 if (clu_offset == num_clusters)
142 *clu = EXFAT_EOF_CLUSTER;
143 else
144 *clu += clu_offset;
145 }
146 } else if (ei->type == TYPE_FILE) {
147 unsigned int fclus = 0;
148 int err = exfat_get_cluster(inode, clu_offset,
149 &fclus, clu, &last_clu, 1);
150 if (err)
151 return -EIO;
152
153 clu_offset -= fclus;
154 } else {
155 /* hint information */
156 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
157 ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
158 clu_offset -= ei->hint_bmap.off;
159 /* hint_bmap.clu should be valid */
160 WARN_ON(ei->hint_bmap.clu < 2);
161 *clu = ei->hint_bmap.clu;
162 }
163
164 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
165 last_clu = *clu;
166 if (exfat_get_next_cluster(sb, clu))
167 return -EIO;
168 clu_offset--;
169 }
170 }
171
172 if (*clu == EXFAT_EOF_CLUSTER) {
173 exfat_set_volume_dirty(sb);
174
175 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
176 EXFAT_EOF_CLUSTER : last_clu + 1;
177 new_clu.size = 0;
178 new_clu.flags = ei->flags;
179
180 /* allocate a cluster */
181 if (num_to_be_allocated < 1) {
182 /* Broken FAT (i_sze > allocated FAT) */
183 exfat_fs_error(sb, "broken FAT chain.");
184 return -EIO;
185 }
186
187 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
188 inode_needs_sync(inode));
189 if (ret)
190 return ret;
191
192 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
193 new_clu.dir == EXFAT_FREE_CLUSTER) {
194 exfat_fs_error(sb,
195 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
196 last_clu, new_clu.dir);
197 return -EIO;
198 }
199
200 /* append to the FAT chain */
201 if (last_clu == EXFAT_EOF_CLUSTER) {
202 if (new_clu.flags == ALLOC_FAT_CHAIN)
203 ei->flags = ALLOC_FAT_CHAIN;
204 ei->start_clu = new_clu.dir;
205 } else {
206 if (new_clu.flags != ei->flags) {
207 /* no-fat-chain bit is disabled,
208 * so fat-chain should be synced with
209 * alloc-bitmap
210 */
211 exfat_chain_cont_cluster(sb, ei->start_clu,
212 num_clusters);
213 ei->flags = ALLOC_FAT_CHAIN;
214 }
215 if (new_clu.flags == ALLOC_FAT_CHAIN)
216 if (exfat_ent_set(sb, last_clu, new_clu.dir))
217 return -EIO;
218 }
219
220 num_clusters += num_to_be_allocated;
221 *clu = new_clu.dir;
222
223 inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
224
225 /*
226 * Move *clu pointer along FAT chains (hole care) because the
227 * caller of this function expect *clu to be the last cluster.
228 * This only works when num_to_be_allocated >= 2,
229 * *clu = (the first cluster of the allocated chain) =>
230 * (the last cluster of ...)
231 */
232 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
233 *clu += num_to_be_allocated - 1;
234 } else {
235 while (num_to_be_allocated > 1) {
236 if (exfat_get_next_cluster(sb, clu))
237 return -EIO;
238 num_to_be_allocated--;
239 }
240 }
241
242 }
243
244 /* hint information */
245 ei->hint_bmap.off = local_clu_offset;
246 ei->hint_bmap.clu = *clu;
247
248 return 0;
249 }
250
exfat_map_new_buffer(struct exfat_inode_info * ei,struct buffer_head * bh,loff_t pos)251 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
252 struct buffer_head *bh, loff_t pos)
253 {
254 if (buffer_delay(bh) && pos > ei->i_size_aligned)
255 return -EIO;
256 set_buffer_new(bh);
257
258 /*
259 * Adjust i_size_aligned if i_size_ondisk is bigger than it.
260 */
261 if (ei->i_size_ondisk > ei->i_size_aligned)
262 ei->i_size_aligned = ei->i_size_ondisk;
263 return 0;
264 }
265
exfat_get_block(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)266 static int exfat_get_block(struct inode *inode, sector_t iblock,
267 struct buffer_head *bh_result, int create)
268 {
269 struct exfat_inode_info *ei = EXFAT_I(inode);
270 struct super_block *sb = inode->i_sb;
271 struct exfat_sb_info *sbi = EXFAT_SB(sb);
272 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
273 int err = 0;
274 unsigned long mapped_blocks = 0;
275 unsigned int cluster, sec_offset;
276 sector_t last_block;
277 sector_t phys = 0;
278 loff_t pos;
279
280 mutex_lock(&sbi->s_lock);
281 last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
282 if (iblock >= last_block && !create)
283 goto done;
284
285 /* Is this block already allocated? */
286 err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
287 &cluster, create);
288 if (err) {
289 if (err != -ENOSPC)
290 exfat_fs_error_ratelimit(sb,
291 "failed to bmap (inode : %p iblock : %llu, err : %d)",
292 inode, (unsigned long long)iblock, err);
293 goto unlock_ret;
294 }
295
296 if (cluster == EXFAT_EOF_CLUSTER)
297 goto done;
298
299 /* sector offset in cluster */
300 sec_offset = iblock & (sbi->sect_per_clus - 1);
301
302 phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
303 mapped_blocks = sbi->sect_per_clus - sec_offset;
304 max_blocks = min(mapped_blocks, max_blocks);
305
306 /* Treat newly added block / cluster */
307 if (iblock < last_block)
308 create = 0;
309
310 if (create || buffer_delay(bh_result)) {
311 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
312 if (ei->i_size_ondisk < pos)
313 ei->i_size_ondisk = pos;
314 }
315
316 if (create) {
317 err = exfat_map_new_buffer(ei, bh_result, pos);
318 if (err) {
319 exfat_fs_error(sb,
320 "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
321 pos, ei->i_size_aligned);
322 goto unlock_ret;
323 }
324 }
325
326 if (buffer_delay(bh_result))
327 clear_buffer_delay(bh_result);
328 map_bh(bh_result, sb, phys);
329 done:
330 bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
331 unlock_ret:
332 mutex_unlock(&sbi->s_lock);
333 return err;
334 }
335
exfat_read_folio(struct file * file,struct folio * folio)336 static int exfat_read_folio(struct file *file, struct folio *folio)
337 {
338 return mpage_read_folio(folio, exfat_get_block);
339 }
340
exfat_readahead(struct readahead_control * rac)341 static void exfat_readahead(struct readahead_control *rac)
342 {
343 mpage_readahead(rac, exfat_get_block);
344 }
345
exfat_writepages(struct address_space * mapping,struct writeback_control * wbc)346 static int exfat_writepages(struct address_space *mapping,
347 struct writeback_control *wbc)
348 {
349 return mpage_writepages(mapping, wbc, exfat_get_block);
350 }
351
exfat_write_failed(struct address_space * mapping,loff_t to)352 static void exfat_write_failed(struct address_space *mapping, loff_t to)
353 {
354 struct inode *inode = mapping->host;
355
356 if (to > i_size_read(inode)) {
357 truncate_pagecache(inode, i_size_read(inode));
358 inode->i_mtime = inode_set_ctime_current(inode);
359 exfat_truncate(inode);
360 }
361 }
362
exfat_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned int len,struct page ** pagep,void ** fsdata)363 static int exfat_write_begin(struct file *file, struct address_space *mapping,
364 loff_t pos, unsigned int len,
365 struct page **pagep, void **fsdata)
366 {
367 int ret;
368
369 *pagep = NULL;
370 ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
371 exfat_get_block,
372 &EXFAT_I(mapping->host)->i_size_ondisk);
373
374 if (ret < 0)
375 exfat_write_failed(mapping, pos+len);
376
377 return ret;
378 }
379
exfat_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned int len,unsigned int copied,struct page * pagep,void * fsdata)380 static int exfat_write_end(struct file *file, struct address_space *mapping,
381 loff_t pos, unsigned int len, unsigned int copied,
382 struct page *pagep, void *fsdata)
383 {
384 struct inode *inode = mapping->host;
385 struct exfat_inode_info *ei = EXFAT_I(inode);
386 int err;
387
388 err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
389
390 if (ei->i_size_aligned < i_size_read(inode)) {
391 exfat_fs_error(inode->i_sb,
392 "invalid size(size(%llu) > aligned(%llu)\n",
393 i_size_read(inode), ei->i_size_aligned);
394 return -EIO;
395 }
396
397 if (err < len)
398 exfat_write_failed(mapping, pos+len);
399
400 if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
401 inode->i_mtime = inode_set_ctime_current(inode);
402 ei->attr |= ATTR_ARCHIVE;
403 mark_inode_dirty(inode);
404 }
405
406 return err;
407 }
408
exfat_direct_IO(struct kiocb * iocb,struct iov_iter * iter)409 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
410 {
411 struct address_space *mapping = iocb->ki_filp->f_mapping;
412 struct inode *inode = mapping->host;
413 loff_t size = iocb->ki_pos + iov_iter_count(iter);
414 int rw = iov_iter_rw(iter);
415 ssize_t ret;
416
417 if (rw == WRITE) {
418 /*
419 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
420 * so we need to update the ->i_size_aligned to block boundary.
421 *
422 * But we must fill the remaining area or hole by nul for
423 * updating ->i_size_aligned
424 *
425 * Return 0, and fallback to normal buffered write.
426 */
427 if (EXFAT_I(inode)->i_size_aligned < size)
428 return 0;
429 }
430
431 /*
432 * Need to use the DIO_LOCKING for avoiding the race
433 * condition of exfat_get_block() and ->truncate().
434 */
435 ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
436 if (ret < 0 && (rw & WRITE))
437 exfat_write_failed(mapping, size);
438 return ret;
439 }
440
exfat_aop_bmap(struct address_space * mapping,sector_t block)441 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
442 {
443 sector_t blocknr;
444
445 /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
446 down_read(&EXFAT_I(mapping->host)->truncate_lock);
447 blocknr = generic_block_bmap(mapping, block, exfat_get_block);
448 up_read(&EXFAT_I(mapping->host)->truncate_lock);
449 return blocknr;
450 }
451
452 /*
453 * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
454 * up to the end of the block which corresponds to `from'.
455 * This is required during truncate to physically zeroout the tail end
456 * of that block so it doesn't yield old data if the file is later grown.
457 * Also, avoid causing failure from fsx for cases of "data past EOF"
458 */
exfat_block_truncate_page(struct inode * inode,loff_t from)459 int exfat_block_truncate_page(struct inode *inode, loff_t from)
460 {
461 return block_truncate_page(inode->i_mapping, from, exfat_get_block);
462 }
463
464 static const struct address_space_operations exfat_aops = {
465 .dirty_folio = block_dirty_folio,
466 .invalidate_folio = block_invalidate_folio,
467 .read_folio = exfat_read_folio,
468 .readahead = exfat_readahead,
469 .writepages = exfat_writepages,
470 .write_begin = exfat_write_begin,
471 .write_end = exfat_write_end,
472 .direct_IO = exfat_direct_IO,
473 .bmap = exfat_aop_bmap,
474 .migrate_folio = buffer_migrate_folio,
475 };
476
exfat_hash(loff_t i_pos)477 static inline unsigned long exfat_hash(loff_t i_pos)
478 {
479 return hash_32(i_pos, EXFAT_HASH_BITS);
480 }
481
exfat_hash_inode(struct inode * inode,loff_t i_pos)482 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
483 {
484 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
485 struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
486
487 spin_lock(&sbi->inode_hash_lock);
488 EXFAT_I(inode)->i_pos = i_pos;
489 hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
490 spin_unlock(&sbi->inode_hash_lock);
491 }
492
exfat_unhash_inode(struct inode * inode)493 void exfat_unhash_inode(struct inode *inode)
494 {
495 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
496
497 spin_lock(&sbi->inode_hash_lock);
498 hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
499 EXFAT_I(inode)->i_pos = 0;
500 spin_unlock(&sbi->inode_hash_lock);
501 }
502
exfat_iget(struct super_block * sb,loff_t i_pos)503 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
504 {
505 struct exfat_sb_info *sbi = EXFAT_SB(sb);
506 struct exfat_inode_info *info;
507 struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
508 struct inode *inode = NULL;
509
510 spin_lock(&sbi->inode_hash_lock);
511 hlist_for_each_entry(info, head, i_hash_fat) {
512 WARN_ON(info->vfs_inode.i_sb != sb);
513
514 if (i_pos != info->i_pos)
515 continue;
516 inode = igrab(&info->vfs_inode);
517 if (inode)
518 break;
519 }
520 spin_unlock(&sbi->inode_hash_lock);
521 return inode;
522 }
523
524 /* doesn't deal with root inode */
exfat_fill_inode(struct inode * inode,struct exfat_dir_entry * info)525 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
526 {
527 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
528 struct exfat_inode_info *ei = EXFAT_I(inode);
529 loff_t size = info->size;
530
531 ei->dir = info->dir;
532 ei->entry = info->entry;
533 ei->attr = info->attr;
534 ei->start_clu = info->start_clu;
535 ei->flags = info->flags;
536 ei->type = info->type;
537
538 ei->version = 0;
539 ei->hint_stat.eidx = 0;
540 ei->hint_stat.clu = info->start_clu;
541 ei->hint_femp.eidx = EXFAT_HINT_NONE;
542 ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
543 ei->i_pos = 0;
544
545 inode->i_uid = sbi->options.fs_uid;
546 inode->i_gid = sbi->options.fs_gid;
547 inode_inc_iversion(inode);
548 inode->i_generation = get_random_u32();
549
550 if (info->attr & ATTR_SUBDIR) { /* directory */
551 inode->i_generation &= ~1;
552 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
553 inode->i_op = &exfat_dir_inode_operations;
554 inode->i_fop = &exfat_dir_operations;
555 set_nlink(inode, info->num_subdirs);
556 } else { /* regular file */
557 inode->i_generation |= 1;
558 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
559 inode->i_op = &exfat_file_inode_operations;
560 inode->i_fop = &exfat_file_operations;
561 inode->i_mapping->a_ops = &exfat_aops;
562 inode->i_mapping->nrpages = 0;
563 }
564
565 i_size_write(inode, size);
566
567 /* ondisk and aligned size should be aligned with block size */
568 if (size & (inode->i_sb->s_blocksize - 1)) {
569 size |= (inode->i_sb->s_blocksize - 1);
570 size++;
571 }
572
573 ei->i_size_aligned = size;
574 ei->i_size_ondisk = size;
575
576 exfat_save_attr(inode, info->attr);
577
578 inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
579 inode->i_mtime = info->mtime;
580 inode_set_ctime_to_ts(inode, info->mtime);
581 ei->i_crtime = info->crtime;
582 inode->i_atime = info->atime;
583
584 return 0;
585 }
586
exfat_build_inode(struct super_block * sb,struct exfat_dir_entry * info,loff_t i_pos)587 struct inode *exfat_build_inode(struct super_block *sb,
588 struct exfat_dir_entry *info, loff_t i_pos)
589 {
590 struct inode *inode;
591 int err;
592
593 inode = exfat_iget(sb, i_pos);
594 if (inode)
595 goto out;
596 inode = new_inode(sb);
597 if (!inode) {
598 inode = ERR_PTR(-ENOMEM);
599 goto out;
600 }
601 inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
602 inode_set_iversion(inode, 1);
603 err = exfat_fill_inode(inode, info);
604 if (err) {
605 iput(inode);
606 inode = ERR_PTR(err);
607 goto out;
608 }
609 exfat_hash_inode(inode, i_pos);
610 insert_inode_hash(inode);
611 out:
612 return inode;
613 }
614
exfat_evict_inode(struct inode * inode)615 void exfat_evict_inode(struct inode *inode)
616 {
617 truncate_inode_pages(&inode->i_data, 0);
618
619 if (!inode->i_nlink) {
620 i_size_write(inode, 0);
621 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
622 __exfat_truncate(inode);
623 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
624 }
625
626 invalidate_inode_buffers(inode);
627 clear_inode(inode);
628 exfat_cache_inval_inode(inode);
629 exfat_unhash_inode(inode);
630 }
631