xref: /linux/fs/exfat/inode.c (revision 59fff63cc2b75dcfe08f9eeb4b2187d73e53843d)
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 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 	struct timespec64 ts;
30 
31 	if (inode->i_ino == EXFAT_ROOT_INO)
32 		return 0;
33 
34 	/*
35 	 * If the inode is already unlinked, there is no need for updating it.
36 	 */
37 	if (ei->dir.dir == DIR_DELETED)
38 		return 0;
39 
40 	if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
41 		return 0;
42 
43 	exfat_set_volume_dirty(sb);
44 
45 	/* get the directory entry of given file or directory */
46 	if (exfat_get_dentry_set(&es, sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES))
47 		return -EIO;
48 	ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
49 	ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
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, &ts,
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 	inode_set_mtime_to_ts(inode, ts);
65 	exfat_set_entry_time(sbi, &ts,
66 			     &ep->dentry.file.access_tz,
67 			     &ep->dentry.file.access_time,
68 			     &ep->dentry.file.access_date,
69 			     NULL);
70 	inode_set_atime_to_ts(inode, ts);
71 
72 	/* File size should be zero if there is no cluster allocated */
73 	on_disk_size = i_size_read(inode);
74 
75 	if (ei->start_clu == EXFAT_EOF_CLUSTER)
76 		on_disk_size = 0;
77 
78 	ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
79 	ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
80 	if (on_disk_size) {
81 		ep2->dentry.stream.flags = ei->flags;
82 		ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu);
83 	} else {
84 		ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
85 		ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
86 	}
87 
88 	exfat_update_dir_chksum_with_entry_set(&es);
89 	return exfat_put_dentry_set(&es, sync);
90 }
91 
92 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
93 {
94 	int ret;
95 
96 	mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
97 	ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
98 	mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
99 
100 	return ret;
101 }
102 
103 void exfat_sync_inode(struct inode *inode)
104 {
105 	lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
106 	__exfat_write_inode(inode, 1);
107 }
108 
109 /*
110  * Input: inode, (logical) clu_offset, target allocation area
111  * Output: errcode, cluster number
112  * *clu = (~0), if it's unable to allocate a new cluster
113  */
114 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
115 		unsigned int *clu, int create)
116 {
117 	int ret;
118 	unsigned int last_clu;
119 	struct exfat_chain new_clu;
120 	struct super_block *sb = inode->i_sb;
121 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
122 	struct exfat_inode_info *ei = EXFAT_I(inode);
123 	unsigned int local_clu_offset = clu_offset;
124 	unsigned int num_to_be_allocated = 0, num_clusters = 0;
125 
126 	if (ei->i_size_ondisk > 0)
127 		num_clusters =
128 			EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
129 
130 	if (clu_offset >= num_clusters)
131 		num_to_be_allocated = clu_offset - num_clusters + 1;
132 
133 	if (!create && (num_to_be_allocated > 0)) {
134 		*clu = EXFAT_EOF_CLUSTER;
135 		return 0;
136 	}
137 
138 	*clu = last_clu = ei->start_clu;
139 
140 	if (ei->flags == ALLOC_NO_FAT_CHAIN) {
141 		if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
142 			last_clu += clu_offset - 1;
143 
144 			if (clu_offset == num_clusters)
145 				*clu = EXFAT_EOF_CLUSTER;
146 			else
147 				*clu += clu_offset;
148 		}
149 	} else if (ei->type == TYPE_FILE) {
150 		unsigned int fclus = 0;
151 		int err = exfat_get_cluster(inode, clu_offset,
152 				&fclus, clu, &last_clu, 1);
153 		if (err)
154 			return -EIO;
155 
156 		clu_offset -= fclus;
157 	} else {
158 		/* hint information */
159 		if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
160 		    ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
161 			clu_offset -= ei->hint_bmap.off;
162 			/* hint_bmap.clu should be valid */
163 			WARN_ON(ei->hint_bmap.clu < 2);
164 			*clu = ei->hint_bmap.clu;
165 		}
166 
167 		while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
168 			last_clu = *clu;
169 			if (exfat_get_next_cluster(sb, clu))
170 				return -EIO;
171 			clu_offset--;
172 		}
173 	}
174 
175 	if (*clu == EXFAT_EOF_CLUSTER) {
176 		exfat_set_volume_dirty(sb);
177 
178 		new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
179 				EXFAT_EOF_CLUSTER : last_clu + 1;
180 		new_clu.size = 0;
181 		new_clu.flags = ei->flags;
182 
183 		/* allocate a cluster */
184 		if (num_to_be_allocated < 1) {
185 			/* Broken FAT (i_sze > allocated FAT) */
186 			exfat_fs_error(sb, "broken FAT chain.");
187 			return -EIO;
188 		}
189 
190 		ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
191 				inode_needs_sync(inode));
192 		if (ret)
193 			return ret;
194 
195 		if (new_clu.dir == EXFAT_EOF_CLUSTER ||
196 		    new_clu.dir == EXFAT_FREE_CLUSTER) {
197 			exfat_fs_error(sb,
198 				"bogus cluster new allocated (last_clu : %u, new_clu : %u)",
199 				last_clu, new_clu.dir);
200 			return -EIO;
201 		}
202 
203 		/* append to the FAT chain */
204 		if (last_clu == EXFAT_EOF_CLUSTER) {
205 			if (new_clu.flags == ALLOC_FAT_CHAIN)
206 				ei->flags = ALLOC_FAT_CHAIN;
207 			ei->start_clu = new_clu.dir;
208 		} else {
209 			if (new_clu.flags != ei->flags) {
210 				/* no-fat-chain bit is disabled,
211 				 * so fat-chain should be synced with
212 				 * alloc-bitmap
213 				 */
214 				exfat_chain_cont_cluster(sb, ei->start_clu,
215 					num_clusters);
216 				ei->flags = ALLOC_FAT_CHAIN;
217 			}
218 			if (new_clu.flags == ALLOC_FAT_CHAIN)
219 				if (exfat_ent_set(sb, last_clu, new_clu.dir))
220 					return -EIO;
221 		}
222 
223 		num_clusters += num_to_be_allocated;
224 		*clu = new_clu.dir;
225 
226 		inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
227 
228 		/*
229 		 * Move *clu pointer along FAT chains (hole care) because the
230 		 * caller of this function expect *clu to be the last cluster.
231 		 * This only works when num_to_be_allocated >= 2,
232 		 * *clu = (the first cluster of the allocated chain) =>
233 		 * (the last cluster of ...)
234 		 */
235 		if (ei->flags == ALLOC_NO_FAT_CHAIN) {
236 			*clu += num_to_be_allocated - 1;
237 		} else {
238 			while (num_to_be_allocated > 1) {
239 				if (exfat_get_next_cluster(sb, clu))
240 					return -EIO;
241 				num_to_be_allocated--;
242 			}
243 		}
244 
245 	}
246 
247 	/* hint information */
248 	ei->hint_bmap.off = local_clu_offset;
249 	ei->hint_bmap.clu = *clu;
250 
251 	return 0;
252 }
253 
254 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
255 		struct buffer_head *bh, loff_t pos)
256 {
257 	if (buffer_delay(bh) && pos > ei->i_size_aligned)
258 		return -EIO;
259 	set_buffer_new(bh);
260 
261 	/*
262 	 * Adjust i_size_aligned if i_size_ondisk is bigger than it.
263 	 */
264 	if (ei->i_size_ondisk > ei->i_size_aligned)
265 		ei->i_size_aligned = ei->i_size_ondisk;
266 	return 0;
267 }
268 
269 static int exfat_get_block(struct inode *inode, sector_t iblock,
270 		struct buffer_head *bh_result, int create)
271 {
272 	struct exfat_inode_info *ei = EXFAT_I(inode);
273 	struct super_block *sb = inode->i_sb;
274 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
275 	unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
276 	int err = 0;
277 	unsigned long mapped_blocks = 0;
278 	unsigned int cluster, sec_offset;
279 	sector_t last_block;
280 	sector_t phys = 0;
281 	loff_t pos;
282 
283 	mutex_lock(&sbi->s_lock);
284 	last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
285 	if (iblock >= last_block && !create)
286 		goto done;
287 
288 	/* Is this block already allocated? */
289 	err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
290 			&cluster, create);
291 	if (err) {
292 		if (err != -ENOSPC)
293 			exfat_fs_error_ratelimit(sb,
294 				"failed to bmap (inode : %p iblock : %llu, err : %d)",
295 				inode, (unsigned long long)iblock, err);
296 		goto unlock_ret;
297 	}
298 
299 	if (cluster == EXFAT_EOF_CLUSTER)
300 		goto done;
301 
302 	/* sector offset in cluster */
303 	sec_offset = iblock & (sbi->sect_per_clus - 1);
304 
305 	phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
306 	mapped_blocks = sbi->sect_per_clus - sec_offset;
307 	max_blocks = min(mapped_blocks, max_blocks);
308 
309 	/* Treat newly added block / cluster */
310 	if (iblock < last_block)
311 		create = 0;
312 
313 	if (create || buffer_delay(bh_result)) {
314 		pos = EXFAT_BLK_TO_B((iblock + 1), sb);
315 		if (ei->i_size_ondisk < pos)
316 			ei->i_size_ondisk = pos;
317 	}
318 
319 	if (create) {
320 		err = exfat_map_new_buffer(ei, bh_result, pos);
321 		if (err) {
322 			exfat_fs_error(sb,
323 					"requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
324 					pos, ei->i_size_aligned);
325 			goto unlock_ret;
326 		}
327 	}
328 
329 	if (buffer_delay(bh_result))
330 		clear_buffer_delay(bh_result);
331 	map_bh(bh_result, sb, phys);
332 done:
333 	bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
334 unlock_ret:
335 	mutex_unlock(&sbi->s_lock);
336 	return err;
337 }
338 
339 static int exfat_read_folio(struct file *file, struct folio *folio)
340 {
341 	return mpage_read_folio(folio, exfat_get_block);
342 }
343 
344 static void exfat_readahead(struct readahead_control *rac)
345 {
346 	mpage_readahead(rac, exfat_get_block);
347 }
348 
349 static int exfat_writepages(struct address_space *mapping,
350 		struct writeback_control *wbc)
351 {
352 	return mpage_writepages(mapping, wbc, exfat_get_block);
353 }
354 
355 static void exfat_write_failed(struct address_space *mapping, loff_t to)
356 {
357 	struct inode *inode = mapping->host;
358 
359 	if (to > i_size_read(inode)) {
360 		truncate_pagecache(inode, i_size_read(inode));
361 		inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
362 		exfat_truncate(inode);
363 	}
364 }
365 
366 static int exfat_write_begin(struct file *file, struct address_space *mapping,
367 		loff_t pos, unsigned int len,
368 		struct page **pagep, void **fsdata)
369 {
370 	int ret;
371 
372 	*pagep = NULL;
373 	ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
374 			       exfat_get_block,
375 			       &EXFAT_I(mapping->host)->i_size_ondisk);
376 
377 	if (ret < 0)
378 		exfat_write_failed(mapping, pos+len);
379 
380 	return ret;
381 }
382 
383 static int exfat_write_end(struct file *file, struct address_space *mapping,
384 		loff_t pos, unsigned int len, unsigned int copied,
385 		struct page *pagep, void *fsdata)
386 {
387 	struct inode *inode = mapping->host;
388 	struct exfat_inode_info *ei = EXFAT_I(inode);
389 	int err;
390 
391 	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
392 
393 	if (ei->i_size_aligned < i_size_read(inode)) {
394 		exfat_fs_error(inode->i_sb,
395 			"invalid size(size(%llu) > aligned(%llu)\n",
396 			i_size_read(inode), ei->i_size_aligned);
397 		return -EIO;
398 	}
399 
400 	if (err < len)
401 		exfat_write_failed(mapping, pos+len);
402 
403 	if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
404 		inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
405 		ei->attr |= ATTR_ARCHIVE;
406 		mark_inode_dirty(inode);
407 	}
408 
409 	return err;
410 }
411 
412 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
413 {
414 	struct address_space *mapping = iocb->ki_filp->f_mapping;
415 	struct inode *inode = mapping->host;
416 	loff_t size = iocb->ki_pos + iov_iter_count(iter);
417 	int rw = iov_iter_rw(iter);
418 	ssize_t ret;
419 
420 	if (rw == WRITE) {
421 		/*
422 		 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
423 		 * so we need to update the ->i_size_aligned to block boundary.
424 		 *
425 		 * But we must fill the remaining area or hole by nul for
426 		 * updating ->i_size_aligned
427 		 *
428 		 * Return 0, and fallback to normal buffered write.
429 		 */
430 		if (EXFAT_I(inode)->i_size_aligned < size)
431 			return 0;
432 	}
433 
434 	/*
435 	 * Need to use the DIO_LOCKING for avoiding the race
436 	 * condition of exfat_get_block() and ->truncate().
437 	 */
438 	ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
439 	if (ret < 0 && (rw & WRITE))
440 		exfat_write_failed(mapping, size);
441 	return ret;
442 }
443 
444 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
445 {
446 	sector_t blocknr;
447 
448 	/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
449 	down_read(&EXFAT_I(mapping->host)->truncate_lock);
450 	blocknr = generic_block_bmap(mapping, block, exfat_get_block);
451 	up_read(&EXFAT_I(mapping->host)->truncate_lock);
452 	return blocknr;
453 }
454 
455 /*
456  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
457  * up to the end of the block which corresponds to `from'.
458  * This is required during truncate to physically zeroout the tail end
459  * of that block so it doesn't yield old data if the file is later grown.
460  * Also, avoid causing failure from fsx for cases of "data past EOF"
461  */
462 int exfat_block_truncate_page(struct inode *inode, loff_t from)
463 {
464 	return block_truncate_page(inode->i_mapping, from, exfat_get_block);
465 }
466 
467 static const struct address_space_operations exfat_aops = {
468 	.dirty_folio	= block_dirty_folio,
469 	.invalidate_folio = block_invalidate_folio,
470 	.read_folio	= exfat_read_folio,
471 	.readahead	= exfat_readahead,
472 	.writepages	= exfat_writepages,
473 	.write_begin	= exfat_write_begin,
474 	.write_end	= exfat_write_end,
475 	.direct_IO	= exfat_direct_IO,
476 	.bmap		= exfat_aop_bmap,
477 	.migrate_folio	= buffer_migrate_folio,
478 };
479 
480 static inline unsigned long exfat_hash(loff_t i_pos)
481 {
482 	return hash_32(i_pos, EXFAT_HASH_BITS);
483 }
484 
485 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
486 {
487 	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
488 	struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
489 
490 	spin_lock(&sbi->inode_hash_lock);
491 	EXFAT_I(inode)->i_pos = i_pos;
492 	hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
493 	spin_unlock(&sbi->inode_hash_lock);
494 }
495 
496 void exfat_unhash_inode(struct inode *inode)
497 {
498 	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
499 
500 	spin_lock(&sbi->inode_hash_lock);
501 	hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
502 	EXFAT_I(inode)->i_pos = 0;
503 	spin_unlock(&sbi->inode_hash_lock);
504 }
505 
506 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
507 {
508 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
509 	struct exfat_inode_info *info;
510 	struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
511 	struct inode *inode = NULL;
512 
513 	spin_lock(&sbi->inode_hash_lock);
514 	hlist_for_each_entry(info, head, i_hash_fat) {
515 		WARN_ON(info->vfs_inode.i_sb != sb);
516 
517 		if (i_pos != info->i_pos)
518 			continue;
519 		inode = igrab(&info->vfs_inode);
520 		if (inode)
521 			break;
522 	}
523 	spin_unlock(&sbi->inode_hash_lock);
524 	return inode;
525 }
526 
527 /* doesn't deal with root inode */
528 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
529 {
530 	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
531 	struct exfat_inode_info *ei = EXFAT_I(inode);
532 	loff_t size = info->size;
533 
534 	ei->dir = info->dir;
535 	ei->entry = info->entry;
536 	ei->attr = info->attr;
537 	ei->start_clu = info->start_clu;
538 	ei->flags = info->flags;
539 	ei->type = info->type;
540 
541 	ei->version = 0;
542 	ei->hint_stat.eidx = 0;
543 	ei->hint_stat.clu = info->start_clu;
544 	ei->hint_femp.eidx = EXFAT_HINT_NONE;
545 	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
546 	ei->i_pos = 0;
547 
548 	inode->i_uid = sbi->options.fs_uid;
549 	inode->i_gid = sbi->options.fs_gid;
550 	inode_inc_iversion(inode);
551 	inode->i_generation = get_random_u32();
552 
553 	if (info->attr & ATTR_SUBDIR) { /* directory */
554 		inode->i_generation &= ~1;
555 		inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
556 		inode->i_op = &exfat_dir_inode_operations;
557 		inode->i_fop = &exfat_dir_operations;
558 		set_nlink(inode, info->num_subdirs);
559 	} else { /* regular file */
560 		inode->i_generation |= 1;
561 		inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
562 		inode->i_op = &exfat_file_inode_operations;
563 		inode->i_fop = &exfat_file_operations;
564 		inode->i_mapping->a_ops = &exfat_aops;
565 		inode->i_mapping->nrpages = 0;
566 	}
567 
568 	i_size_write(inode, size);
569 
570 	/* ondisk and aligned size should be aligned with block size */
571 	if (size & (inode->i_sb->s_blocksize - 1)) {
572 		size |= (inode->i_sb->s_blocksize - 1);
573 		size++;
574 	}
575 
576 	ei->i_size_aligned = size;
577 	ei->i_size_ondisk = size;
578 
579 	exfat_save_attr(inode, info->attr);
580 
581 	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
582 	inode_set_mtime_to_ts(inode, info->mtime);
583 	inode_set_ctime_to_ts(inode, info->mtime);
584 	ei->i_crtime = info->crtime;
585 	inode_set_atime_to_ts(inode, info->atime);
586 
587 	return 0;
588 }
589 
590 struct inode *exfat_build_inode(struct super_block *sb,
591 		struct exfat_dir_entry *info, loff_t i_pos)
592 {
593 	struct inode *inode;
594 	int err;
595 
596 	inode = exfat_iget(sb, i_pos);
597 	if (inode)
598 		goto out;
599 	inode = new_inode(sb);
600 	if (!inode) {
601 		inode = ERR_PTR(-ENOMEM);
602 		goto out;
603 	}
604 	inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
605 	inode_set_iversion(inode, 1);
606 	err = exfat_fill_inode(inode, info);
607 	if (err) {
608 		iput(inode);
609 		inode = ERR_PTR(err);
610 		goto out;
611 	}
612 	exfat_hash_inode(inode, i_pos);
613 	insert_inode_hash(inode);
614 out:
615 	return inode;
616 }
617 
618 void exfat_evict_inode(struct inode *inode)
619 {
620 	truncate_inode_pages(&inode->i_data, 0);
621 
622 	if (!inode->i_nlink) {
623 		i_size_write(inode, 0);
624 		mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
625 		__exfat_truncate(inode);
626 		mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
627 	}
628 
629 	invalidate_inode_buffers(inode);
630 	clear_inode(inode);
631 	exfat_cache_inval_inode(inode);
632 	exfat_unhash_inode(inode);
633 }
634