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5f2aa075 NJ |
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 | ||
23e6e1c9 | 20 | int __exfat_write_inode(struct inode *inode, int sync) |
5f2aa075 | 21 | { |
5f2aa075 NJ |
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 | /* | |
6fa96cd5 | 34 | * If the inode is already unlinked, there is no need for updating it. |
5f2aa075 NJ |
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 | ||
7018ec68 | 42 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
43 | |
44 | /* get the directory entry of given file or directory */ | |
943af1fd | 45 | es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES); |
5f2aa075 NJ |
46 | if (!es) |
47 | return -EIO; | |
943af1fd TK |
48 | ep = exfat_get_dentry_cached(es, 0); |
49 | ep2 = exfat_get_dentry_cached(es, 1); | |
5f2aa075 NJ |
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, | |
ed0f84d3 | 58 | &ep->dentry.file.create_time_cs); |
5f2aa075 NJ |
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, | |
ed0f84d3 | 63 | &ep->dentry.file.modify_time_cs); |
5f2aa075 NJ |
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; | |
23e6e1c9 YM |
78 | if (on_disk_size) { |
79 | ep2->dentry.stream.flags = ei->flags; | |
80 | ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu); | |
81 | } else { | |
82 | ep2->dentry.stream.flags = ALLOC_FAT_CHAIN; | |
83 | ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER; | |
84 | } | |
5f2aa075 | 85 | |
943af1fd | 86 | exfat_update_dir_chksum_with_entry_set(es); |
8b0c4717 | 87 | return exfat_free_dentry_set(es, sync); |
5f2aa075 NJ |
88 | } |
89 | ||
90 | int exfat_write_inode(struct inode *inode, struct writeback_control *wbc) | |
91 | { | |
92 | int ret; | |
93 | ||
94 | mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); | |
95 | ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); | |
96 | mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | void exfat_sync_inode(struct inode *inode) | |
102 | { | |
103 | lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock); | |
104 | __exfat_write_inode(inode, 1); | |
105 | } | |
106 | ||
107 | /* | |
108 | * Input: inode, (logical) clu_offset, target allocation area | |
109 | * Output: errcode, cluster number | |
110 | * *clu = (~0), if it's unable to allocate a new cluster | |
111 | */ | |
112 | static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset, | |
113 | unsigned int *clu, int create) | |
114 | { | |
be17b1cc | 115 | int ret; |
5f2aa075 NJ |
116 | unsigned int last_clu; |
117 | struct exfat_chain new_clu; | |
5f2aa075 NJ |
118 | struct super_block *sb = inode->i_sb; |
119 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
120 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
121 | unsigned int local_clu_offset = clu_offset; | |
122 | unsigned int num_to_be_allocated = 0, num_clusters = 0; | |
123 | ||
7dee6f57 | 124 | if (ei->i_size_ondisk > 0) |
5f2aa075 | 125 | num_clusters = |
7dee6f57 | 126 | EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi); |
5f2aa075 NJ |
127 | |
128 | if (clu_offset >= num_clusters) | |
129 | num_to_be_allocated = clu_offset - num_clusters + 1; | |
130 | ||
131 | if (!create && (num_to_be_allocated > 0)) { | |
132 | *clu = EXFAT_EOF_CLUSTER; | |
133 | return 0; | |
134 | } | |
135 | ||
136 | *clu = last_clu = ei->start_clu; | |
137 | ||
138 | if (ei->flags == ALLOC_NO_FAT_CHAIN) { | |
139 | if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) { | |
140 | last_clu += clu_offset - 1; | |
141 | ||
142 | if (clu_offset == num_clusters) | |
143 | *clu = EXFAT_EOF_CLUSTER; | |
144 | else | |
145 | *clu += clu_offset; | |
146 | } | |
147 | } else if (ei->type == TYPE_FILE) { | |
148 | unsigned int fclus = 0; | |
149 | int err = exfat_get_cluster(inode, clu_offset, | |
150 | &fclus, clu, &last_clu, 1); | |
151 | if (err) | |
152 | return -EIO; | |
153 | ||
154 | clu_offset -= fclus; | |
155 | } else { | |
156 | /* hint information */ | |
157 | if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && | |
158 | ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { | |
159 | clu_offset -= ei->hint_bmap.off; | |
160 | /* hint_bmap.clu should be valid */ | |
161 | WARN_ON(ei->hint_bmap.clu < 2); | |
162 | *clu = ei->hint_bmap.clu; | |
163 | } | |
164 | ||
165 | while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) { | |
166 | last_clu = *clu; | |
167 | if (exfat_get_next_cluster(sb, clu)) | |
168 | return -EIO; | |
169 | clu_offset--; | |
170 | } | |
171 | } | |
172 | ||
173 | if (*clu == EXFAT_EOF_CLUSTER) { | |
7018ec68 | 174 | exfat_set_volume_dirty(sb); |
5f2aa075 NJ |
175 | |
176 | new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ? | |
177 | EXFAT_EOF_CLUSTER : last_clu + 1; | |
178 | new_clu.size = 0; | |
179 | new_clu.flags = ei->flags; | |
180 | ||
181 | /* allocate a cluster */ | |
182 | if (num_to_be_allocated < 1) { | |
183 | /* Broken FAT (i_sze > allocated FAT) */ | |
184 | exfat_fs_error(sb, "broken FAT chain."); | |
185 | return -EIO; | |
186 | } | |
187 | ||
23befe49 HK |
188 | ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu, |
189 | inode_needs_sync(inode)); | |
5f2aa075 NJ |
190 | if (ret) |
191 | return ret; | |
192 | ||
193 | if (new_clu.dir == EXFAT_EOF_CLUSTER || | |
194 | new_clu.dir == EXFAT_FREE_CLUSTER) { | |
195 | exfat_fs_error(sb, | |
196 | "bogus cluster new allocated (last_clu : %u, new_clu : %u)", | |
197 | last_clu, new_clu.dir); | |
198 | return -EIO; | |
199 | } | |
200 | ||
201 | /* append to the FAT chain */ | |
202 | if (last_clu == EXFAT_EOF_CLUSTER) { | |
203 | if (new_clu.flags == ALLOC_FAT_CHAIN) | |
204 | ei->flags = ALLOC_FAT_CHAIN; | |
205 | ei->start_clu = new_clu.dir; | |
5f2aa075 NJ |
206 | } else { |
207 | if (new_clu.flags != ei->flags) { | |
208 | /* no-fat-chain bit is disabled, | |
209 | * so fat-chain should be synced with | |
210 | * alloc-bitmap | |
211 | */ | |
212 | exfat_chain_cont_cluster(sb, ei->start_clu, | |
213 | num_clusters); | |
214 | ei->flags = ALLOC_FAT_CHAIN; | |
5f2aa075 NJ |
215 | } |
216 | if (new_clu.flags == ALLOC_FAT_CHAIN) | |
217 | if (exfat_ent_set(sb, last_clu, new_clu.dir)) | |
218 | return -EIO; | |
219 | } | |
220 | ||
221 | num_clusters += num_to_be_allocated; | |
222 | *clu = new_clu.dir; | |
223 | ||
5f2aa075 NJ |
224 | inode->i_blocks += |
225 | num_to_be_allocated << sbi->sect_per_clus_bits; | |
226 | ||
227 | /* | |
228 | * Move *clu pointer along FAT chains (hole care) because the | |
229 | * caller of this function expect *clu to be the last cluster. | |
230 | * This only works when num_to_be_allocated >= 2, | |
231 | * *clu = (the first cluster of the allocated chain) => | |
232 | * (the last cluster of ...) | |
233 | */ | |
234 | if (ei->flags == ALLOC_NO_FAT_CHAIN) { | |
235 | *clu += num_to_be_allocated - 1; | |
236 | } else { | |
237 | while (num_to_be_allocated > 1) { | |
238 | if (exfat_get_next_cluster(sb, clu)) | |
239 | return -EIO; | |
240 | num_to_be_allocated--; | |
241 | } | |
242 | } | |
243 | ||
244 | } | |
245 | ||
246 | /* hint information */ | |
247 | ei->hint_bmap.off = local_clu_offset; | |
248 | ei->hint_bmap.clu = *clu; | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static int exfat_map_new_buffer(struct exfat_inode_info *ei, | |
254 | struct buffer_head *bh, loff_t pos) | |
255 | { | |
256 | if (buffer_delay(bh) && pos > ei->i_size_aligned) | |
257 | return -EIO; | |
258 | set_buffer_new(bh); | |
259 | ||
260 | /* | |
261 | * Adjust i_size_aligned if i_size_ondisk is bigger than it. | |
262 | */ | |
263 | if (ei->i_size_ondisk > ei->i_size_aligned) | |
264 | ei->i_size_aligned = ei->i_size_ondisk; | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int exfat_get_block(struct inode *inode, sector_t iblock, | |
269 | struct buffer_head *bh_result, int create) | |
270 | { | |
271 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
272 | struct super_block *sb = inode->i_sb; | |
273 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
274 | unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; | |
275 | int err = 0; | |
276 | unsigned long mapped_blocks = 0; | |
277 | unsigned int cluster, sec_offset; | |
278 | sector_t last_block; | |
279 | sector_t phys = 0; | |
280 | loff_t pos; | |
281 | ||
282 | mutex_lock(&sbi->s_lock); | |
283 | last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb); | |
284 | if (iblock >= last_block && !create) | |
285 | goto done; | |
286 | ||
287 | /* Is this block already allocated? */ | |
288 | err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits, | |
289 | &cluster, create); | |
290 | if (err) { | |
291 | if (err != -ENOSPC) | |
292 | exfat_fs_error_ratelimit(sb, | |
293 | "failed to bmap (inode : %p iblock : %llu, err : %d)", | |
294 | inode, (unsigned long long)iblock, err); | |
295 | goto unlock_ret; | |
296 | } | |
297 | ||
298 | if (cluster == EXFAT_EOF_CLUSTER) | |
299 | goto done; | |
300 | ||
301 | /* sector offset in cluster */ | |
302 | sec_offset = iblock & (sbi->sect_per_clus - 1); | |
303 | ||
304 | phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset; | |
305 | mapped_blocks = sbi->sect_per_clus - sec_offset; | |
306 | max_blocks = min(mapped_blocks, max_blocks); | |
307 | ||
308 | /* Treat newly added block / cluster */ | |
309 | if (iblock < last_block) | |
310 | create = 0; | |
311 | ||
312 | if (create || buffer_delay(bh_result)) { | |
313 | pos = EXFAT_BLK_TO_B((iblock + 1), sb); | |
314 | if (ei->i_size_ondisk < pos) | |
315 | ei->i_size_ondisk = pos; | |
316 | } | |
317 | ||
318 | if (create) { | |
319 | err = exfat_map_new_buffer(ei, bh_result, pos); | |
320 | if (err) { | |
321 | exfat_fs_error(sb, | |
322 | "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n", | |
323 | pos, ei->i_size_aligned); | |
324 | goto unlock_ret; | |
325 | } | |
326 | } | |
327 | ||
328 | if (buffer_delay(bh_result)) | |
329 | clear_buffer_delay(bh_result); | |
330 | map_bh(bh_result, sb, phys); | |
331 | done: | |
332 | bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb); | |
333 | unlock_ret: | |
334 | mutex_unlock(&sbi->s_lock); | |
335 | return err; | |
336 | } | |
337 | ||
f132ab7d | 338 | static int exfat_read_folio(struct file *file, struct folio *folio) |
5f2aa075 | 339 | { |
f132ab7d | 340 | return mpage_read_folio(folio, exfat_get_block); |
5f2aa075 NJ |
341 | } |
342 | ||
d4388340 | 343 | static void exfat_readahead(struct readahead_control *rac) |
5f2aa075 | 344 | { |
d4388340 | 345 | mpage_readahead(rac, exfat_get_block); |
5f2aa075 NJ |
346 | } |
347 | ||
5f2aa075 NJ |
348 | static int exfat_writepages(struct address_space *mapping, |
349 | struct writeback_control *wbc) | |
350 | { | |
351 | return mpage_writepages(mapping, wbc, exfat_get_block); | |
352 | } | |
353 | ||
354 | static void exfat_write_failed(struct address_space *mapping, loff_t to) | |
355 | { | |
356 | struct inode *inode = mapping->host; | |
357 | ||
358 | if (to > i_size_read(inode)) { | |
359 | truncate_pagecache(inode, i_size_read(inode)); | |
4493895b | 360 | inode->i_mtime = inode->i_ctime = current_time(inode); |
5f2aa075 NJ |
361 | exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned); |
362 | } | |
363 | } | |
364 | ||
365 | static int exfat_write_begin(struct file *file, struct address_space *mapping, | |
9d6b0cd7 | 366 | loff_t pos, unsigned int len, |
5f2aa075 NJ |
367 | struct page **pagep, void **fsdata) |
368 | { | |
369 | int ret; | |
370 | ||
371 | *pagep = NULL; | |
be3bbbc5 | 372 | ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata, |
5f2aa075 NJ |
373 | exfat_get_block, |
374 | &EXFAT_I(mapping->host)->i_size_ondisk); | |
375 | ||
376 | if (ret < 0) | |
377 | exfat_write_failed(mapping, pos+len); | |
378 | ||
379 | return ret; | |
380 | } | |
381 | ||
382 | static int exfat_write_end(struct file *file, struct address_space *mapping, | |
383 | loff_t pos, unsigned int len, unsigned int copied, | |
384 | struct page *pagep, void *fsdata) | |
385 | { | |
386 | struct inode *inode = mapping->host; | |
387 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
388 | int err; | |
389 | ||
390 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
391 | ||
7dee6f57 | 392 | if (ei->i_size_aligned < i_size_read(inode)) { |
5f2aa075 NJ |
393 | exfat_fs_error(inode->i_sb, |
394 | "invalid size(size(%llu) > aligned(%llu)\n", | |
7dee6f57 | 395 | i_size_read(inode), ei->i_size_aligned); |
5f2aa075 NJ |
396 | return -EIO; |
397 | } | |
398 | ||
399 | if (err < len) | |
400 | exfat_write_failed(mapping, pos+len); | |
401 | ||
402 | if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) { | |
403 | inode->i_mtime = inode->i_ctime = current_time(inode); | |
404 | ei->attr |= ATTR_ARCHIVE; | |
405 | mark_inode_dirty(inode); | |
406 | } | |
407 | ||
408 | return err; | |
409 | } | |
410 | ||
411 | static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter) | |
412 | { | |
413 | struct address_space *mapping = iocb->ki_filp->f_mapping; | |
414 | struct inode *inode = mapping->host; | |
415 | loff_t size = iocb->ki_pos + iov_iter_count(iter); | |
416 | int rw = iov_iter_rw(iter); | |
417 | ssize_t ret; | |
418 | ||
419 | if (rw == WRITE) { | |
420 | /* | |
421 | * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), | |
422 | * so we need to update the ->i_size_aligned to block boundary. | |
423 | * | |
424 | * But we must fill the remaining area or hole by nul for | |
425 | * updating ->i_size_aligned | |
426 | * | |
427 | * Return 0, and fallback to normal buffered write. | |
428 | */ | |
429 | if (EXFAT_I(inode)->i_size_aligned < size) | |
430 | return 0; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Need to use the DIO_LOCKING for avoiding the race | |
435 | * condition of exfat_get_block() and ->truncate(). | |
436 | */ | |
437 | ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block); | |
438 | if (ret < 0 && (rw & WRITE)) | |
439 | exfat_write_failed(mapping, size); | |
440 | return ret; | |
441 | } | |
442 | ||
443 | static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block) | |
444 | { | |
445 | sector_t blocknr; | |
446 | ||
447 | /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */ | |
448 | down_read(&EXFAT_I(mapping->host)->truncate_lock); | |
449 | blocknr = generic_block_bmap(mapping, block, exfat_get_block); | |
450 | up_read(&EXFAT_I(mapping->host)->truncate_lock); | |
451 | return blocknr; | |
452 | } | |
453 | ||
454 | /* | |
455 | * exfat_block_truncate_page() zeroes out a mapping from file offset `from' | |
456 | * up to the end of the block which corresponds to `from'. | |
457 | * This is required during truncate to physically zeroout the tail end | |
458 | * of that block so it doesn't yield old data if the file is later grown. | |
459 | * Also, avoid causing failure from fsx for cases of "data past EOF" | |
460 | */ | |
461 | int exfat_block_truncate_page(struct inode *inode, loff_t from) | |
462 | { | |
463 | return block_truncate_page(inode->i_mapping, from, exfat_get_block); | |
464 | } | |
465 | ||
466 | static const struct address_space_operations exfat_aops = { | |
e621900a | 467 | .dirty_folio = block_dirty_folio, |
7ba13abb | 468 | .invalidate_folio = block_invalidate_folio, |
f132ab7d | 469 | .read_folio = exfat_read_folio, |
d4388340 | 470 | .readahead = exfat_readahead, |
5f2aa075 NJ |
471 | .writepages = exfat_writepages, |
472 | .write_begin = exfat_write_begin, | |
473 | .write_end = exfat_write_end, | |
474 | .direct_IO = exfat_direct_IO, | |
a1177412 CH |
475 | .bmap = exfat_aop_bmap, |
476 | .migrate_folio = buffer_migrate_folio, | |
5f2aa075 NJ |
477 | }; |
478 | ||
479 | static inline unsigned long exfat_hash(loff_t i_pos) | |
480 | { | |
481 | return hash_32(i_pos, EXFAT_HASH_BITS); | |
482 | } | |
483 | ||
484 | void exfat_hash_inode(struct inode *inode, loff_t i_pos) | |
485 | { | |
486 | struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); | |
487 | struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); | |
488 | ||
489 | spin_lock(&sbi->inode_hash_lock); | |
490 | EXFAT_I(inode)->i_pos = i_pos; | |
491 | hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head); | |
492 | spin_unlock(&sbi->inode_hash_lock); | |
493 | } | |
494 | ||
495 | void exfat_unhash_inode(struct inode *inode) | |
496 | { | |
497 | struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); | |
498 | ||
499 | spin_lock(&sbi->inode_hash_lock); | |
500 | hlist_del_init(&EXFAT_I(inode)->i_hash_fat); | |
501 | EXFAT_I(inode)->i_pos = 0; | |
502 | spin_unlock(&sbi->inode_hash_lock); | |
503 | } | |
504 | ||
505 | struct inode *exfat_iget(struct super_block *sb, loff_t i_pos) | |
506 | { | |
507 | struct exfat_sb_info *sbi = EXFAT_SB(sb); | |
508 | struct exfat_inode_info *info; | |
509 | struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); | |
510 | struct inode *inode = NULL; | |
511 | ||
512 | spin_lock(&sbi->inode_hash_lock); | |
513 | hlist_for_each_entry(info, head, i_hash_fat) { | |
514 | WARN_ON(info->vfs_inode.i_sb != sb); | |
515 | ||
516 | if (i_pos != info->i_pos) | |
517 | continue; | |
518 | inode = igrab(&info->vfs_inode); | |
519 | if (inode) | |
520 | break; | |
521 | } | |
522 | spin_unlock(&sbi->inode_hash_lock); | |
523 | return inode; | |
524 | } | |
525 | ||
526 | /* doesn't deal with root inode */ | |
527 | static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info) | |
528 | { | |
529 | struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); | |
530 | struct exfat_inode_info *ei = EXFAT_I(inode); | |
531 | loff_t size = info->size; | |
532 | ||
a7a24168 | 533 | ei->dir = info->dir; |
5f2aa075 NJ |
534 | ei->entry = info->entry; |
535 | ei->attr = info->attr; | |
536 | ei->start_clu = info->start_clu; | |
537 | ei->flags = info->flags; | |
538 | ei->type = info->type; | |
539 | ||
540 | ei->version = 0; | |
541 | ei->hint_stat.eidx = 0; | |
542 | ei->hint_stat.clu = info->start_clu; | |
543 | ei->hint_femp.eidx = EXFAT_HINT_NONE; | |
5f2aa075 NJ |
544 | ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
545 | ei->i_pos = 0; | |
546 | ||
547 | inode->i_uid = sbi->options.fs_uid; | |
548 | inode->i_gid = sbi->options.fs_gid; | |
549 | inode_inc_iversion(inode); | |
a251c17a | 550 | inode->i_generation = get_random_u32(); |
5f2aa075 NJ |
551 | |
552 | if (info->attr & ATTR_SUBDIR) { /* directory */ | |
553 | inode->i_generation &= ~1; | |
554 | inode->i_mode = exfat_make_mode(sbi, info->attr, 0777); | |
555 | inode->i_op = &exfat_dir_inode_operations; | |
556 | inode->i_fop = &exfat_dir_operations; | |
557 | set_nlink(inode, info->num_subdirs); | |
558 | } else { /* regular file */ | |
559 | inode->i_generation |= 1; | |
560 | inode->i_mode = exfat_make_mode(sbi, info->attr, 0777); | |
561 | inode->i_op = &exfat_file_inode_operations; | |
562 | inode->i_fop = &exfat_file_operations; | |
563 | inode->i_mapping->a_ops = &exfat_aops; | |
564 | inode->i_mapping->nrpages = 0; | |
565 | } | |
566 | ||
567 | i_size_write(inode, size); | |
568 | ||
569 | /* ondisk and aligned size should be aligned with block size */ | |
570 | if (size & (inode->i_sb->s_blocksize - 1)) { | |
571 | size |= (inode->i_sb->s_blocksize - 1); | |
572 | size++; | |
573 | } | |
574 | ||
575 | ei->i_size_aligned = size; | |
576 | ei->i_size_ondisk = size; | |
577 | ||
578 | exfat_save_attr(inode, info->attr); | |
579 | ||
92fba084 CVB |
580 | inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> |
581 | inode->i_blkbits; | |
5f2aa075 NJ |
582 | inode->i_mtime = info->mtime; |
583 | inode->i_ctime = info->mtime; | |
584 | ei->i_crtime = info->crtime; | |
585 | inode->i_atime = info->atime; | |
586 | ||
5f2aa075 NJ |
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, 0); | |
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 | } |