xref: /openbmc/linux/fs/exfat/inode.c (revision 405db98b)
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 indode 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 (EXFAT_I(inode)->i_size_ondisk > 0)
118 		num_clusters =
119 			EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk,
120 			sbi);
121 
122 	if (clu_offset >= num_clusters)
123 		num_to_be_allocated = clu_offset - num_clusters + 1;
124 
125 	if (!create && (num_to_be_allocated > 0)) {
126 		*clu = EXFAT_EOF_CLUSTER;
127 		return 0;
128 	}
129 
130 	*clu = last_clu = ei->start_clu;
131 
132 	if (ei->flags == ALLOC_NO_FAT_CHAIN) {
133 		if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
134 			last_clu += clu_offset - 1;
135 
136 			if (clu_offset == num_clusters)
137 				*clu = EXFAT_EOF_CLUSTER;
138 			else
139 				*clu += clu_offset;
140 		}
141 	} else if (ei->type == TYPE_FILE) {
142 		unsigned int fclus = 0;
143 		int err = exfat_get_cluster(inode, clu_offset,
144 				&fclus, clu, &last_clu, 1);
145 		if (err)
146 			return -EIO;
147 
148 		clu_offset -= fclus;
149 	} else {
150 		/* hint information */
151 		if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
152 		    ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
153 			clu_offset -= ei->hint_bmap.off;
154 			/* hint_bmap.clu should be valid */
155 			WARN_ON(ei->hint_bmap.clu < 2);
156 			*clu = ei->hint_bmap.clu;
157 		}
158 
159 		while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
160 			last_clu = *clu;
161 			if (exfat_get_next_cluster(sb, clu))
162 				return -EIO;
163 			clu_offset--;
164 		}
165 	}
166 
167 	if (*clu == EXFAT_EOF_CLUSTER) {
168 		exfat_set_volume_dirty(sb);
169 
170 		new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
171 				EXFAT_EOF_CLUSTER : last_clu + 1;
172 		new_clu.size = 0;
173 		new_clu.flags = ei->flags;
174 
175 		/* allocate a cluster */
176 		if (num_to_be_allocated < 1) {
177 			/* Broken FAT (i_sze > allocated FAT) */
178 			exfat_fs_error(sb, "broken FAT chain.");
179 			return -EIO;
180 		}
181 
182 		ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
183 				inode_needs_sync(inode));
184 		if (ret)
185 			return ret;
186 
187 		if (new_clu.dir == EXFAT_EOF_CLUSTER ||
188 		    new_clu.dir == EXFAT_FREE_CLUSTER) {
189 			exfat_fs_error(sb,
190 				"bogus cluster new allocated (last_clu : %u, new_clu : %u)",
191 				last_clu, new_clu.dir);
192 			return -EIO;
193 		}
194 
195 		/* append to the FAT chain */
196 		if (last_clu == EXFAT_EOF_CLUSTER) {
197 			if (new_clu.flags == ALLOC_FAT_CHAIN)
198 				ei->flags = ALLOC_FAT_CHAIN;
199 			ei->start_clu = new_clu.dir;
200 			modified = true;
201 		} else {
202 			if (new_clu.flags != ei->flags) {
203 				/* no-fat-chain bit is disabled,
204 				 * so fat-chain should be synced with
205 				 * alloc-bitmap
206 				 */
207 				exfat_chain_cont_cluster(sb, ei->start_clu,
208 					num_clusters);
209 				ei->flags = ALLOC_FAT_CHAIN;
210 				modified = true;
211 			}
212 			if (new_clu.flags == ALLOC_FAT_CHAIN)
213 				if (exfat_ent_set(sb, last_clu, new_clu.dir))
214 					return -EIO;
215 		}
216 
217 		num_clusters += num_to_be_allocated;
218 		*clu = new_clu.dir;
219 
220 		if (ei->dir.dir != DIR_DELETED && modified) {
221 			struct exfat_dentry *ep;
222 			struct exfat_entry_set_cache *es;
223 			int err;
224 
225 			es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
226 				ES_ALL_ENTRIES);
227 			if (!es)
228 				return -EIO;
229 			/* get stream entry */
230 			ep = exfat_get_dentry_cached(es, 1);
231 
232 			/* update directory entry */
233 			ep->dentry.stream.flags = ei->flags;
234 			ep->dentry.stream.start_clu =
235 				cpu_to_le32(ei->start_clu);
236 			ep->dentry.stream.valid_size =
237 				cpu_to_le64(i_size_read(inode));
238 			ep->dentry.stream.size =
239 				ep->dentry.stream.valid_size;
240 
241 			exfat_update_dir_chksum_with_entry_set(es);
242 			err = exfat_free_dentry_set(es, inode_needs_sync(inode));
243 			if (err)
244 				return err;
245 		} /* end of if != DIR_DELETED */
246 
247 		inode->i_blocks +=
248 			num_to_be_allocated << sbi->sect_per_clus_bits;
249 
250 		/*
251 		 * Move *clu pointer along FAT chains (hole care) because the
252 		 * caller of this function expect *clu to be the last cluster.
253 		 * This only works when num_to_be_allocated >= 2,
254 		 * *clu = (the first cluster of the allocated chain) =>
255 		 * (the last cluster of ...)
256 		 */
257 		if (ei->flags == ALLOC_NO_FAT_CHAIN) {
258 			*clu += num_to_be_allocated - 1;
259 		} else {
260 			while (num_to_be_allocated > 1) {
261 				if (exfat_get_next_cluster(sb, clu))
262 					return -EIO;
263 				num_to_be_allocated--;
264 			}
265 		}
266 
267 	}
268 
269 	/* hint information */
270 	ei->hint_bmap.off = local_clu_offset;
271 	ei->hint_bmap.clu = *clu;
272 
273 	return 0;
274 }
275 
276 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
277 		struct buffer_head *bh, loff_t pos)
278 {
279 	if (buffer_delay(bh) && pos > ei->i_size_aligned)
280 		return -EIO;
281 	set_buffer_new(bh);
282 
283 	/*
284 	 * Adjust i_size_aligned if i_size_ondisk is bigger than it.
285 	 */
286 	if (ei->i_size_ondisk > ei->i_size_aligned)
287 		ei->i_size_aligned = ei->i_size_ondisk;
288 	return 0;
289 }
290 
291 static int exfat_get_block(struct inode *inode, sector_t iblock,
292 		struct buffer_head *bh_result, int create)
293 {
294 	struct exfat_inode_info *ei = EXFAT_I(inode);
295 	struct super_block *sb = inode->i_sb;
296 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
297 	unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
298 	int err = 0;
299 	unsigned long mapped_blocks = 0;
300 	unsigned int cluster, sec_offset;
301 	sector_t last_block;
302 	sector_t phys = 0;
303 	loff_t pos;
304 
305 	mutex_lock(&sbi->s_lock);
306 	last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
307 	if (iblock >= last_block && !create)
308 		goto done;
309 
310 	/* Is this block already allocated? */
311 	err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
312 			&cluster, create);
313 	if (err) {
314 		if (err != -ENOSPC)
315 			exfat_fs_error_ratelimit(sb,
316 				"failed to bmap (inode : %p iblock : %llu, err : %d)",
317 				inode, (unsigned long long)iblock, err);
318 		goto unlock_ret;
319 	}
320 
321 	if (cluster == EXFAT_EOF_CLUSTER)
322 		goto done;
323 
324 	/* sector offset in cluster */
325 	sec_offset = iblock & (sbi->sect_per_clus - 1);
326 
327 	phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
328 	mapped_blocks = sbi->sect_per_clus - sec_offset;
329 	max_blocks = min(mapped_blocks, max_blocks);
330 
331 	/* Treat newly added block / cluster */
332 	if (iblock < last_block)
333 		create = 0;
334 
335 	if (create || buffer_delay(bh_result)) {
336 		pos = EXFAT_BLK_TO_B((iblock + 1), sb);
337 		if (ei->i_size_ondisk < pos)
338 			ei->i_size_ondisk = pos;
339 	}
340 
341 	if (create) {
342 		err = exfat_map_new_buffer(ei, bh_result, pos);
343 		if (err) {
344 			exfat_fs_error(sb,
345 					"requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
346 					pos, ei->i_size_aligned);
347 			goto unlock_ret;
348 		}
349 	}
350 
351 	if (buffer_delay(bh_result))
352 		clear_buffer_delay(bh_result);
353 	map_bh(bh_result, sb, phys);
354 done:
355 	bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
356 unlock_ret:
357 	mutex_unlock(&sbi->s_lock);
358 	return err;
359 }
360 
361 static int exfat_readpage(struct file *file, struct page *page)
362 {
363 	return mpage_readpage(page, exfat_get_block);
364 }
365 
366 static void exfat_readahead(struct readahead_control *rac)
367 {
368 	mpage_readahead(rac, exfat_get_block);
369 }
370 
371 static int exfat_writepage(struct page *page, struct writeback_control *wbc)
372 {
373 	return block_write_full_page(page, exfat_get_block, wbc);
374 }
375 
376 static int exfat_writepages(struct address_space *mapping,
377 		struct writeback_control *wbc)
378 {
379 	return mpage_writepages(mapping, wbc, exfat_get_block);
380 }
381 
382 static void exfat_write_failed(struct address_space *mapping, loff_t to)
383 {
384 	struct inode *inode = mapping->host;
385 
386 	if (to > i_size_read(inode)) {
387 		truncate_pagecache(inode, i_size_read(inode));
388 		exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
389 	}
390 }
391 
392 static int exfat_write_begin(struct file *file, struct address_space *mapping,
393 		loff_t pos, unsigned int len, unsigned int flags,
394 		struct page **pagep, void **fsdata)
395 {
396 	int ret;
397 
398 	*pagep = NULL;
399 	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
400 			       exfat_get_block,
401 			       &EXFAT_I(mapping->host)->i_size_ondisk);
402 
403 	if (ret < 0)
404 		exfat_write_failed(mapping, pos+len);
405 
406 	return ret;
407 }
408 
409 static int exfat_write_end(struct file *file, struct address_space *mapping,
410 		loff_t pos, unsigned int len, unsigned int copied,
411 		struct page *pagep, void *fsdata)
412 {
413 	struct inode *inode = mapping->host;
414 	struct exfat_inode_info *ei = EXFAT_I(inode);
415 	int err;
416 
417 	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
418 
419 	if (EXFAT_I(inode)->i_size_aligned < i_size_read(inode)) {
420 		exfat_fs_error(inode->i_sb,
421 			"invalid size(size(%llu) > aligned(%llu)\n",
422 			i_size_read(inode), EXFAT_I(inode)->i_size_aligned);
423 		return -EIO;
424 	}
425 
426 	if (err < len)
427 		exfat_write_failed(mapping, pos+len);
428 
429 	if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
430 		inode->i_mtime = inode->i_ctime = current_time(inode);
431 		ei->attr |= ATTR_ARCHIVE;
432 		mark_inode_dirty(inode);
433 	}
434 
435 	return err;
436 }
437 
438 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
439 {
440 	struct address_space *mapping = iocb->ki_filp->f_mapping;
441 	struct inode *inode = mapping->host;
442 	loff_t size = iocb->ki_pos + iov_iter_count(iter);
443 	int rw = iov_iter_rw(iter);
444 	ssize_t ret;
445 
446 	if (rw == WRITE) {
447 		/*
448 		 * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
449 		 * so we need to update the ->i_size_aligned to block boundary.
450 		 *
451 		 * But we must fill the remaining area or hole by nul for
452 		 * updating ->i_size_aligned
453 		 *
454 		 * Return 0, and fallback to normal buffered write.
455 		 */
456 		if (EXFAT_I(inode)->i_size_aligned < size)
457 			return 0;
458 	}
459 
460 	/*
461 	 * Need to use the DIO_LOCKING for avoiding the race
462 	 * condition of exfat_get_block() and ->truncate().
463 	 */
464 	ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
465 	if (ret < 0 && (rw & WRITE))
466 		exfat_write_failed(mapping, size);
467 	return ret;
468 }
469 
470 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
471 {
472 	sector_t blocknr;
473 
474 	/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
475 	down_read(&EXFAT_I(mapping->host)->truncate_lock);
476 	blocknr = generic_block_bmap(mapping, block, exfat_get_block);
477 	up_read(&EXFAT_I(mapping->host)->truncate_lock);
478 	return blocknr;
479 }
480 
481 /*
482  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
483  * up to the end of the block which corresponds to `from'.
484  * This is required during truncate to physically zeroout the tail end
485  * of that block so it doesn't yield old data if the file is later grown.
486  * Also, avoid causing failure from fsx for cases of "data past EOF"
487  */
488 int exfat_block_truncate_page(struct inode *inode, loff_t from)
489 {
490 	return block_truncate_page(inode->i_mapping, from, exfat_get_block);
491 }
492 
493 static const struct address_space_operations exfat_aops = {
494 	.set_page_dirty	= __set_page_dirty_buffers,
495 	.readpage	= exfat_readpage,
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 = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
607 		~((loff_t)sbi->cluster_size - 1)) >> 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 }
660