GNU Linux-libre 5.19-rc6-gnu
[releases.git] / fs / exfat / inode.c
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
20 static 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 = NULL;
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         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES);
46         if (!es)
47                 return -EIO;
48         ep = exfat_get_dentry_cached(es, 0);
49         ep2 = exfat_get_dentry_cached(es, 1);
50
51         ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
52
53         /* set FILE_INFO structure using the acquired struct exfat_dentry */
54         exfat_set_entry_time(sbi, &ei->i_crtime,
55                         &ep->dentry.file.create_tz,
56                         &ep->dentry.file.create_time,
57                         &ep->dentry.file.create_date,
58                         &ep->dentry.file.create_time_cs);
59         exfat_set_entry_time(sbi, &inode->i_mtime,
60                         &ep->dentry.file.modify_tz,
61                         &ep->dentry.file.modify_time,
62                         &ep->dentry.file.modify_date,
63                         &ep->dentry.file.modify_time_cs);
64         exfat_set_entry_time(sbi, &inode->i_atime,
65                         &ep->dentry.file.access_tz,
66                         &ep->dentry.file.access_time,
67                         &ep->dentry.file.access_date,
68                         NULL);
69
70         /* File size should be zero if there is no cluster allocated */
71         on_disk_size = i_size_read(inode);
72
73         if (ei->start_clu == EXFAT_EOF_CLUSTER)
74                 on_disk_size = 0;
75
76         ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
77         ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
78
79         exfat_update_dir_chksum_with_entry_set(es);
80         return exfat_free_dentry_set(es, sync);
81 }
82
83 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
84 {
85         int ret;
86
87         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
88         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
89         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
90
91         return ret;
92 }
93
94 void exfat_sync_inode(struct inode *inode)
95 {
96         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
97         __exfat_write_inode(inode, 1);
98 }
99
100 /*
101  * Input: inode, (logical) clu_offset, target allocation area
102  * Output: errcode, cluster number
103  * *clu = (~0), if it's unable to allocate a new cluster
104  */
105 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
106                 unsigned int *clu, int create)
107 {
108         int ret, modified = false;
109         unsigned int last_clu;
110         struct exfat_chain new_clu;
111         struct super_block *sb = inode->i_sb;
112         struct exfat_sb_info *sbi = EXFAT_SB(sb);
113         struct exfat_inode_info *ei = EXFAT_I(inode);
114         unsigned int local_clu_offset = clu_offset;
115         unsigned int num_to_be_allocated = 0, num_clusters = 0;
116
117         if (ei->i_size_ondisk > 0)
118                 num_clusters =
119                         EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
120
121         if (clu_offset >= num_clusters)
122                 num_to_be_allocated = clu_offset - num_clusters + 1;
123
124         if (!create && (num_to_be_allocated > 0)) {
125                 *clu = EXFAT_EOF_CLUSTER;
126                 return 0;
127         }
128
129         *clu = last_clu = ei->start_clu;
130
131         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
132                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
133                         last_clu += clu_offset - 1;
134
135                         if (clu_offset == num_clusters)
136                                 *clu = EXFAT_EOF_CLUSTER;
137                         else
138                                 *clu += clu_offset;
139                 }
140         } else if (ei->type == TYPE_FILE) {
141                 unsigned int fclus = 0;
142                 int err = exfat_get_cluster(inode, clu_offset,
143                                 &fclus, clu, &last_clu, 1);
144                 if (err)
145                         return -EIO;
146
147                 clu_offset -= fclus;
148         } else {
149                 /* hint information */
150                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
151                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
152                         clu_offset -= ei->hint_bmap.off;
153                         /* hint_bmap.clu should be valid */
154                         WARN_ON(ei->hint_bmap.clu < 2);
155                         *clu = ei->hint_bmap.clu;
156                 }
157
158                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
159                         last_clu = *clu;
160                         if (exfat_get_next_cluster(sb, clu))
161                                 return -EIO;
162                         clu_offset--;
163                 }
164         }
165
166         if (*clu == EXFAT_EOF_CLUSTER) {
167                 exfat_set_volume_dirty(sb);
168
169                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
170                                 EXFAT_EOF_CLUSTER : last_clu + 1;
171                 new_clu.size = 0;
172                 new_clu.flags = ei->flags;
173
174                 /* allocate a cluster */
175                 if (num_to_be_allocated < 1) {
176                         /* Broken FAT (i_sze > allocated FAT) */
177                         exfat_fs_error(sb, "broken FAT chain.");
178                         return -EIO;
179                 }
180
181                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
182                                 inode_needs_sync(inode));
183                 if (ret)
184                         return ret;
185
186                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
187                     new_clu.dir == EXFAT_FREE_CLUSTER) {
188                         exfat_fs_error(sb,
189                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
190                                 last_clu, new_clu.dir);
191                         return -EIO;
192                 }
193
194                 /* append to the FAT chain */
195                 if (last_clu == EXFAT_EOF_CLUSTER) {
196                         if (new_clu.flags == ALLOC_FAT_CHAIN)
197                                 ei->flags = ALLOC_FAT_CHAIN;
198                         ei->start_clu = new_clu.dir;
199                         modified = true;
200                 } else {
201                         if (new_clu.flags != ei->flags) {
202                                 /* no-fat-chain bit is disabled,
203                                  * so fat-chain should be synced with
204                                  * alloc-bitmap
205                                  */
206                                 exfat_chain_cont_cluster(sb, ei->start_clu,
207                                         num_clusters);
208                                 ei->flags = ALLOC_FAT_CHAIN;
209                                 modified = true;
210                         }
211                         if (new_clu.flags == ALLOC_FAT_CHAIN)
212                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
213                                         return -EIO;
214                 }
215
216                 num_clusters += num_to_be_allocated;
217                 *clu = new_clu.dir;
218
219                 if (ei->dir.dir != DIR_DELETED && modified) {
220                         struct exfat_dentry *ep;
221                         struct exfat_entry_set_cache *es;
222                         int err;
223
224                         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
225                                 ES_ALL_ENTRIES);
226                         if (!es)
227                                 return -EIO;
228                         /* get stream entry */
229                         ep = exfat_get_dentry_cached(es, 1);
230
231                         /* update directory entry */
232                         ep->dentry.stream.flags = ei->flags;
233                         ep->dentry.stream.start_clu =
234                                 cpu_to_le32(ei->start_clu);
235                         ep->dentry.stream.valid_size =
236                                 cpu_to_le64(i_size_read(inode));
237                         ep->dentry.stream.size =
238                                 ep->dentry.stream.valid_size;
239
240                         exfat_update_dir_chksum_with_entry_set(es);
241                         err = exfat_free_dentry_set(es, inode_needs_sync(inode));
242                         if (err)
243                                 return err;
244                 } /* end of if != DIR_DELETED */
245
246                 inode->i_blocks +=
247                         num_to_be_allocated << sbi->sect_per_clus_bits;
248
249                 /*
250                  * Move *clu pointer along FAT chains (hole care) because the
251                  * caller of this function expect *clu to be the last cluster.
252                  * This only works when num_to_be_allocated >= 2,
253                  * *clu = (the first cluster of the allocated chain) =>
254                  * (the last cluster of ...)
255                  */
256                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
257                         *clu += num_to_be_allocated - 1;
258                 } else {
259                         while (num_to_be_allocated > 1) {
260                                 if (exfat_get_next_cluster(sb, clu))
261                                         return -EIO;
262                                 num_to_be_allocated--;
263                         }
264                 }
265
266         }
267
268         /* hint information */
269         ei->hint_bmap.off = local_clu_offset;
270         ei->hint_bmap.clu = *clu;
271
272         return 0;
273 }
274
275 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
276                 struct buffer_head *bh, loff_t pos)
277 {
278         if (buffer_delay(bh) && pos > ei->i_size_aligned)
279                 return -EIO;
280         set_buffer_new(bh);
281
282         /*
283          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
284          */
285         if (ei->i_size_ondisk > ei->i_size_aligned)
286                 ei->i_size_aligned = ei->i_size_ondisk;
287         return 0;
288 }
289
290 static int exfat_get_block(struct inode *inode, sector_t iblock,
291                 struct buffer_head *bh_result, int create)
292 {
293         struct exfat_inode_info *ei = EXFAT_I(inode);
294         struct super_block *sb = inode->i_sb;
295         struct exfat_sb_info *sbi = EXFAT_SB(sb);
296         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
297         int err = 0;
298         unsigned long mapped_blocks = 0;
299         unsigned int cluster, sec_offset;
300         sector_t last_block;
301         sector_t phys = 0;
302         loff_t pos;
303
304         mutex_lock(&sbi->s_lock);
305         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
306         if (iblock >= last_block && !create)
307                 goto done;
308
309         /* Is this block already allocated? */
310         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
311                         &cluster, create);
312         if (err) {
313                 if (err != -ENOSPC)
314                         exfat_fs_error_ratelimit(sb,
315                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
316                                 inode, (unsigned long long)iblock, err);
317                 goto unlock_ret;
318         }
319
320         if (cluster == EXFAT_EOF_CLUSTER)
321                 goto done;
322
323         /* sector offset in cluster */
324         sec_offset = iblock & (sbi->sect_per_clus - 1);
325
326         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
327         mapped_blocks = sbi->sect_per_clus - sec_offset;
328         max_blocks = min(mapped_blocks, max_blocks);
329
330         /* Treat newly added block / cluster */
331         if (iblock < last_block)
332                 create = 0;
333
334         if (create || buffer_delay(bh_result)) {
335                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
336                 if (ei->i_size_ondisk < pos)
337                         ei->i_size_ondisk = pos;
338         }
339
340         if (create) {
341                 err = exfat_map_new_buffer(ei, bh_result, pos);
342                 if (err) {
343                         exfat_fs_error(sb,
344                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
345                                         pos, ei->i_size_aligned);
346                         goto unlock_ret;
347                 }
348         }
349
350         if (buffer_delay(bh_result))
351                 clear_buffer_delay(bh_result);
352         map_bh(bh_result, sb, phys);
353 done:
354         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
355 unlock_ret:
356         mutex_unlock(&sbi->s_lock);
357         return err;
358 }
359
360 static int exfat_read_folio(struct file *file, struct folio *folio)
361 {
362         return mpage_read_folio(folio, exfat_get_block);
363 }
364
365 static void exfat_readahead(struct readahead_control *rac)
366 {
367         mpage_readahead(rac, exfat_get_block);
368 }
369
370 static int exfat_writepage(struct page *page, struct writeback_control *wbc)
371 {
372         return block_write_full_page(page, exfat_get_block, wbc);
373 }
374
375 static int exfat_writepages(struct address_space *mapping,
376                 struct writeback_control *wbc)
377 {
378         return mpage_writepages(mapping, wbc, exfat_get_block);
379 }
380
381 static void exfat_write_failed(struct address_space *mapping, loff_t to)
382 {
383         struct inode *inode = mapping->host;
384
385         if (to > i_size_read(inode)) {
386                 truncate_pagecache(inode, i_size_read(inode));
387                 exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
388         }
389 }
390
391 static int exfat_write_begin(struct file *file, struct address_space *mapping,
392                 loff_t pos, unsigned int len,
393                 struct page **pagep, void **fsdata)
394 {
395         int ret;
396
397         *pagep = NULL;
398         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
399                                exfat_get_block,
400                                &EXFAT_I(mapping->host)->i_size_ondisk);
401
402         if (ret < 0)
403                 exfat_write_failed(mapping, pos+len);
404
405         return ret;
406 }
407
408 static int exfat_write_end(struct file *file, struct address_space *mapping,
409                 loff_t pos, unsigned int len, unsigned int copied,
410                 struct page *pagep, void *fsdata)
411 {
412         struct inode *inode = mapping->host;
413         struct exfat_inode_info *ei = EXFAT_I(inode);
414         int err;
415
416         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
417
418         if (ei->i_size_aligned < i_size_read(inode)) {
419                 exfat_fs_error(inode->i_sb,
420                         "invalid size(size(%llu) > aligned(%llu)\n",
421                         i_size_read(inode), ei->i_size_aligned);
422                 return -EIO;
423         }
424
425         if (err < len)
426                 exfat_write_failed(mapping, pos+len);
427
428         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
429                 inode->i_mtime = inode->i_ctime = current_time(inode);
430                 ei->attr |= ATTR_ARCHIVE;
431                 mark_inode_dirty(inode);
432         }
433
434         return err;
435 }
436
437 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
438 {
439         struct address_space *mapping = iocb->ki_filp->f_mapping;
440         struct inode *inode = mapping->host;
441         loff_t size = iocb->ki_pos + iov_iter_count(iter);
442         int rw = iov_iter_rw(iter);
443         ssize_t ret;
444
445         if (rw == WRITE) {
446                 /*
447                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
448                  * so we need to update the ->i_size_aligned to block boundary.
449                  *
450                  * But we must fill the remaining area or hole by nul for
451                  * updating ->i_size_aligned
452                  *
453                  * Return 0, and fallback to normal buffered write.
454                  */
455                 if (EXFAT_I(inode)->i_size_aligned < size)
456                         return 0;
457         }
458
459         /*
460          * Need to use the DIO_LOCKING for avoiding the race
461          * condition of exfat_get_block() and ->truncate().
462          */
463         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
464         if (ret < 0 && (rw & WRITE))
465                 exfat_write_failed(mapping, size);
466         return ret;
467 }
468
469 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
470 {
471         sector_t blocknr;
472
473         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
474         down_read(&EXFAT_I(mapping->host)->truncate_lock);
475         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
476         up_read(&EXFAT_I(mapping->host)->truncate_lock);
477         return blocknr;
478 }
479
480 /*
481  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
482  * up to the end of the block which corresponds to `from'.
483  * This is required during truncate to physically zeroout the tail end
484  * of that block so it doesn't yield old data if the file is later grown.
485  * Also, avoid causing failure from fsx for cases of "data past EOF"
486  */
487 int exfat_block_truncate_page(struct inode *inode, loff_t from)
488 {
489         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
490 }
491
492 static const struct address_space_operations exfat_aops = {
493         .dirty_folio    = block_dirty_folio,
494         .invalidate_folio = block_invalidate_folio,
495         .read_folio     = exfat_read_folio,
496         .readahead      = exfat_readahead,
497         .writepage      = exfat_writepage,
498         .writepages     = exfat_writepages,
499         .write_begin    = exfat_write_begin,
500         .write_end      = exfat_write_end,
501         .direct_IO      = exfat_direct_IO,
502         .bmap           = exfat_aop_bmap
503 };
504
505 static inline unsigned long exfat_hash(loff_t i_pos)
506 {
507         return hash_32(i_pos, EXFAT_HASH_BITS);
508 }
509
510 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
511 {
512         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
513         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
514
515         spin_lock(&sbi->inode_hash_lock);
516         EXFAT_I(inode)->i_pos = i_pos;
517         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
518         spin_unlock(&sbi->inode_hash_lock);
519 }
520
521 void exfat_unhash_inode(struct inode *inode)
522 {
523         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
524
525         spin_lock(&sbi->inode_hash_lock);
526         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
527         EXFAT_I(inode)->i_pos = 0;
528         spin_unlock(&sbi->inode_hash_lock);
529 }
530
531 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
532 {
533         struct exfat_sb_info *sbi = EXFAT_SB(sb);
534         struct exfat_inode_info *info;
535         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
536         struct inode *inode = NULL;
537
538         spin_lock(&sbi->inode_hash_lock);
539         hlist_for_each_entry(info, head, i_hash_fat) {
540                 WARN_ON(info->vfs_inode.i_sb != sb);
541
542                 if (i_pos != info->i_pos)
543                         continue;
544                 inode = igrab(&info->vfs_inode);
545                 if (inode)
546                         break;
547         }
548         spin_unlock(&sbi->inode_hash_lock);
549         return inode;
550 }
551
552 /* doesn't deal with root inode */
553 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
554 {
555         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
556         struct exfat_inode_info *ei = EXFAT_I(inode);
557         loff_t size = info->size;
558
559         ei->dir = info->dir;
560         ei->entry = info->entry;
561         ei->attr = info->attr;
562         ei->start_clu = info->start_clu;
563         ei->flags = info->flags;
564         ei->type = info->type;
565
566         ei->version = 0;
567         ei->hint_stat.eidx = 0;
568         ei->hint_stat.clu = info->start_clu;
569         ei->hint_femp.eidx = EXFAT_HINT_NONE;
570         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
571         ei->i_pos = 0;
572
573         inode->i_uid = sbi->options.fs_uid;
574         inode->i_gid = sbi->options.fs_gid;
575         inode_inc_iversion(inode);
576         inode->i_generation = prandom_u32();
577
578         if (info->attr & ATTR_SUBDIR) { /* directory */
579                 inode->i_generation &= ~1;
580                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
581                 inode->i_op = &exfat_dir_inode_operations;
582                 inode->i_fop = &exfat_dir_operations;
583                 set_nlink(inode, info->num_subdirs);
584         } else { /* regular file */
585                 inode->i_generation |= 1;
586                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
587                 inode->i_op = &exfat_file_inode_operations;
588                 inode->i_fop = &exfat_file_operations;
589                 inode->i_mapping->a_ops = &exfat_aops;
590                 inode->i_mapping->nrpages = 0;
591         }
592
593         i_size_write(inode, size);
594
595         /* ondisk and aligned size should be aligned with block size */
596         if (size & (inode->i_sb->s_blocksize - 1)) {
597                 size |= (inode->i_sb->s_blocksize - 1);
598                 size++;
599         }
600
601         ei->i_size_aligned = size;
602         ei->i_size_ondisk = size;
603
604         exfat_save_attr(inode, info->attr);
605
606         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
607                                 inode->i_blkbits;
608         inode->i_mtime = info->mtime;
609         inode->i_ctime = info->mtime;
610         ei->i_crtime = info->crtime;
611         inode->i_atime = info->atime;
612
613         return 0;
614 }
615
616 struct inode *exfat_build_inode(struct super_block *sb,
617                 struct exfat_dir_entry *info, loff_t i_pos)
618 {
619         struct inode *inode;
620         int err;
621
622         inode = exfat_iget(sb, i_pos);
623         if (inode)
624                 goto out;
625         inode = new_inode(sb);
626         if (!inode) {
627                 inode = ERR_PTR(-ENOMEM);
628                 goto out;
629         }
630         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
631         inode_set_iversion(inode, 1);
632         err = exfat_fill_inode(inode, info);
633         if (err) {
634                 iput(inode);
635                 inode = ERR_PTR(err);
636                 goto out;
637         }
638         exfat_hash_inode(inode, i_pos);
639         insert_inode_hash(inode);
640 out:
641         return inode;
642 }
643
644 void exfat_evict_inode(struct inode *inode)
645 {
646         truncate_inode_pages(&inode->i_data, 0);
647
648         if (!inode->i_nlink) {
649                 i_size_write(inode, 0);
650                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
651                 __exfat_truncate(inode, 0);
652                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
653         }
654
655         invalidate_inode_buffers(inode);
656         clear_inode(inode);
657         exfat_cache_inval_inode(inode);
658         exfat_unhash_inode(inode);
659 }