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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/file.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/file.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
617ba13b | 15 | * ext4 fs regular file handling primitives |
ac27a0ec DK |
16 | * |
17 | * 64-bit file support on 64-bit platforms by Jakub Jelinek | |
18 | * (jj@sunsite.ms.mff.cuni.cz) | |
19 | */ | |
20 | ||
21 | #include <linux/time.h> | |
22 | #include <linux/fs.h> | |
dab291af | 23 | #include <linux/jbd2.h> |
bc0b0d6d TT |
24 | #include <linux/mount.h> |
25 | #include <linux/path.h> | |
871a2931 | 26 | #include <linux/quotaops.h> |
c8c0df24 | 27 | #include <linux/pagevec.h> |
3dcf5451 CH |
28 | #include "ext4.h" |
29 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
30 | #include "xattr.h" |
31 | #include "acl.h" | |
32 | ||
33 | /* | |
34 | * Called when an inode is released. Note that this is different | |
617ba13b | 35 | * from ext4_file_open: open gets called at every open, but release |
ac27a0ec DK |
36 | * gets called only when /all/ the files are closed. |
37 | */ | |
af5bc92d | 38 | static int ext4_release_file(struct inode *inode, struct file *filp) |
ac27a0ec | 39 | { |
19f5fb7a | 40 | if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) { |
7d8f9f7d | 41 | ext4_alloc_da_blocks(inode); |
19f5fb7a | 42 | ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 43 | } |
ac27a0ec DK |
44 | /* if we are the last writer on the inode, drop the block reservation */ |
45 | if ((filp->f_mode & FMODE_WRITE) && | |
d6014301 AK |
46 | (atomic_read(&inode->i_writecount) == 1) && |
47 | !EXT4_I(inode)->i_reserved_data_blocks) | |
ac27a0ec | 48 | { |
0e855ac8 | 49 | down_write(&EXT4_I(inode)->i_data_sem); |
c2ea3fde | 50 | ext4_discard_preallocations(inode); |
0e855ac8 | 51 | up_write(&EXT4_I(inode)->i_data_sem); |
ac27a0ec DK |
52 | } |
53 | if (is_dx(inode) && filp->private_data) | |
617ba13b | 54 | ext4_htree_free_dir_info(filp->private_data); |
ac27a0ec DK |
55 | |
56 | return 0; | |
57 | } | |
58 | ||
c278531d | 59 | void ext4_unwritten_wait(struct inode *inode) |
e9e3bcec ES |
60 | { |
61 | wait_queue_head_t *wq = ext4_ioend_wq(inode); | |
62 | ||
e27f41e1 | 63 | wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0)); |
e9e3bcec ES |
64 | } |
65 | ||
66 | /* | |
67 | * This tests whether the IO in question is block-aligned or not. | |
68 | * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they | |
69 | * are converted to written only after the IO is complete. Until they are | |
70 | * mapped, these blocks appear as holes, so dio_zero_block() will assume that | |
71 | * it needs to zero out portions of the start and/or end block. If 2 AIO | |
72 | * threads are at work on the same unwritten block, they must be synchronized | |
73 | * or one thread will zero the other's data, causing corruption. | |
74 | */ | |
75 | static int | |
76 | ext4_unaligned_aio(struct inode *inode, const struct iovec *iov, | |
77 | unsigned long nr_segs, loff_t pos) | |
78 | { | |
79 | struct super_block *sb = inode->i_sb; | |
80 | int blockmask = sb->s_blocksize - 1; | |
81 | size_t count = iov_length(iov, nr_segs); | |
82 | loff_t final_size = pos + count; | |
83 | ||
84 | if (pos >= inode->i_size) | |
85 | return 0; | |
86 | ||
87 | if ((pos & blockmask) || (final_size & blockmask)) | |
88 | return 1; | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
ac27a0ec | 93 | static ssize_t |
fbe10494 ZL |
94 | ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov, |
95 | unsigned long nr_segs, loff_t pos) | |
ac27a0ec | 96 | { |
4bd809db ZL |
97 | struct file *file = iocb->ki_filp; |
98 | struct inode *inode = file->f_mapping->host; | |
99 | struct blk_plug plug; | |
e9e3bcec | 100 | int unaligned_aio = 0; |
8563000d | 101 | ssize_t ret; |
4bd809db ZL |
102 | int overwrite = 0; |
103 | size_t length = iov_length(iov, nr_segs); | |
ac27a0ec | 104 | |
fbe10494 ZL |
105 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && |
106 | !is_sync_kiocb(iocb)) | |
e9e3bcec | 107 | unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos); |
e2b46574 | 108 | |
e9e3bcec ES |
109 | /* Unaligned direct AIO must be serialized; see comment above */ |
110 | if (unaligned_aio) { | |
111 | static unsigned long unaligned_warn_time; | |
112 | ||
113 | /* Warn about this once per day */ | |
114 | if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ)) | |
115 | ext4_msg(inode->i_sb, KERN_WARNING, | |
116 | "Unaligned AIO/DIO on inode %ld by %s; " | |
117 | "performance will be poor.", | |
118 | inode->i_ino, current->comm); | |
119 | mutex_lock(ext4_aio_mutex(inode)); | |
e27f41e1 | 120 | ext4_unwritten_wait(inode); |
e9e3bcec ES |
121 | } |
122 | ||
4bd809db ZL |
123 | BUG_ON(iocb->ki_pos != pos); |
124 | ||
125 | mutex_lock(&inode->i_mutex); | |
126 | blk_start_plug(&plug); | |
127 | ||
128 | iocb->private = &overwrite; | |
129 | ||
130 | /* check whether we do a DIO overwrite or not */ | |
131 | if (ext4_should_dioread_nolock(inode) && !unaligned_aio && | |
132 | !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) { | |
133 | struct ext4_map_blocks map; | |
134 | unsigned int blkbits = inode->i_blkbits; | |
135 | int err, len; | |
136 | ||
137 | map.m_lblk = pos >> blkbits; | |
138 | map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits) | |
139 | - map.m_lblk; | |
140 | len = map.m_len; | |
141 | ||
142 | err = ext4_map_blocks(NULL, inode, &map, 0); | |
143 | /* | |
144 | * 'err==len' means that all of blocks has been preallocated no | |
145 | * matter they are initialized or not. For excluding | |
146 | * uninitialized extents, we need to check m_flags. There are | |
147 | * two conditions that indicate for initialized extents. | |
148 | * 1) If we hit extent cache, EXT4_MAP_MAPPED flag is returned; | |
149 | * 2) If we do a real lookup, non-flags are returned. | |
150 | * So we should check these two conditions. | |
151 | */ | |
152 | if (err == len && (map.m_flags & EXT4_MAP_MAPPED)) | |
153 | overwrite = 1; | |
154 | } | |
155 | ||
156 | ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos); | |
157 | mutex_unlock(&inode->i_mutex); | |
158 | ||
159 | if (ret > 0 || ret == -EIOCBQUEUED) { | |
160 | ssize_t err; | |
161 | ||
162 | err = generic_write_sync(file, pos, ret); | |
163 | if (err < 0 && ret > 0) | |
164 | ret = err; | |
165 | } | |
166 | blk_finish_plug(&plug); | |
e9e3bcec ES |
167 | |
168 | if (unaligned_aio) | |
169 | mutex_unlock(ext4_aio_mutex(inode)); | |
170 | ||
171 | return ret; | |
ac27a0ec DK |
172 | } |
173 | ||
ac27a0ec | 174 | static ssize_t |
617ba13b | 175 | ext4_file_write(struct kiocb *iocb, const struct iovec *iov, |
ac27a0ec DK |
176 | unsigned long nr_segs, loff_t pos) |
177 | { | |
0d34ec62 | 178 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
8563000d | 179 | ssize_t ret; |
ac27a0ec | 180 | |
e2b46574 ES |
181 | /* |
182 | * If we have encountered a bitmap-format file, the size limit | |
183 | * is smaller than s_maxbytes, which is for extent-mapped files. | |
184 | */ | |
185 | ||
12e9b892 | 186 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 ES |
187 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
188 | size_t length = iov_length(iov, nr_segs); | |
ac27a0ec | 189 | |
d889dc83 TO |
190 | if ((pos > sbi->s_bitmap_maxbytes || |
191 | (pos == sbi->s_bitmap_maxbytes && length > 0))) | |
e2b46574 ES |
192 | return -EFBIG; |
193 | ||
194 | if (pos + length > sbi->s_bitmap_maxbytes) { | |
195 | nr_segs = iov_shorten((struct iovec *)iov, nr_segs, | |
196 | sbi->s_bitmap_maxbytes - pos); | |
197 | } | |
198 | } | |
199 | ||
fbe10494 ZL |
200 | if (unlikely(iocb->ki_filp->f_flags & O_DIRECT)) |
201 | ret = ext4_file_dio_write(iocb, iov, nr_segs, pos); | |
202 | else | |
203 | ret = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
e9e3bcec ES |
204 | |
205 | return ret; | |
ac27a0ec DK |
206 | } |
207 | ||
f0f37e2f | 208 | static const struct vm_operations_struct ext4_file_vm_ops = { |
2e9ee850 AK |
209 | .fault = filemap_fault, |
210 | .page_mkwrite = ext4_page_mkwrite, | |
0b173bc4 | 211 | .remap_pages = generic_file_remap_pages, |
2e9ee850 AK |
212 | }; |
213 | ||
214 | static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) | |
215 | { | |
216 | struct address_space *mapping = file->f_mapping; | |
217 | ||
218 | if (!mapping->a_ops->readpage) | |
219 | return -ENOEXEC; | |
220 | file_accessed(file); | |
221 | vma->vm_ops = &ext4_file_vm_ops; | |
2e9ee850 AK |
222 | return 0; |
223 | } | |
224 | ||
bc0b0d6d TT |
225 | static int ext4_file_open(struct inode * inode, struct file * filp) |
226 | { | |
227 | struct super_block *sb = inode->i_sb; | |
228 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
8aefcd55 | 229 | struct ext4_inode_info *ei = EXT4_I(inode); |
bc0b0d6d TT |
230 | struct vfsmount *mnt = filp->f_path.mnt; |
231 | struct path path; | |
232 | char buf[64], *cp; | |
233 | ||
234 | if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && | |
235 | !(sb->s_flags & MS_RDONLY))) { | |
236 | sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; | |
237 | /* | |
238 | * Sample where the filesystem has been mounted and | |
239 | * store it in the superblock for sysadmin convenience | |
240 | * when trying to sort through large numbers of block | |
241 | * devices or filesystem images. | |
242 | */ | |
243 | memset(buf, 0, sizeof(buf)); | |
3899167d AV |
244 | path.mnt = mnt; |
245 | path.dentry = mnt->mnt_root; | |
bc0b0d6d | 246 | cp = d_path(&path, buf, sizeof(buf)); |
bc0b0d6d | 247 | if (!IS_ERR(cp)) { |
044ce47f JK |
248 | handle_t *handle; |
249 | int err; | |
250 | ||
251 | handle = ext4_journal_start_sb(sb, 1); | |
252 | if (IS_ERR(handle)) | |
253 | return PTR_ERR(handle); | |
254 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); | |
255 | if (err) { | |
256 | ext4_journal_stop(handle); | |
257 | return err; | |
258 | } | |
cf803903 DW |
259 | strlcpy(sbi->s_es->s_last_mounted, cp, |
260 | sizeof(sbi->s_es->s_last_mounted)); | |
044ce47f JK |
261 | ext4_handle_dirty_super(handle, sb); |
262 | ext4_journal_stop(handle); | |
bc0b0d6d TT |
263 | } |
264 | } | |
8aefcd55 TT |
265 | /* |
266 | * Set up the jbd2_inode if we are opening the inode for | |
267 | * writing and the journal is present | |
268 | */ | |
269 | if (sbi->s_journal && !ei->jinode && (filp->f_mode & FMODE_WRITE)) { | |
270 | struct jbd2_inode *jinode = jbd2_alloc_inode(GFP_KERNEL); | |
271 | ||
272 | spin_lock(&inode->i_lock); | |
273 | if (!ei->jinode) { | |
274 | if (!jinode) { | |
275 | spin_unlock(&inode->i_lock); | |
276 | return -ENOMEM; | |
277 | } | |
278 | ei->jinode = jinode; | |
279 | jbd2_journal_init_jbd_inode(ei->jinode, inode); | |
280 | jinode = NULL; | |
281 | } | |
282 | spin_unlock(&inode->i_lock); | |
283 | if (unlikely(jinode != NULL)) | |
284 | jbd2_free_inode(jinode); | |
285 | } | |
907f4554 | 286 | return dquot_file_open(inode, filp); |
bc0b0d6d TT |
287 | } |
288 | ||
c8c0df24 ZL |
289 | /* |
290 | * Here we use ext4_map_blocks() to get a block mapping for a extent-based | |
291 | * file rather than ext4_ext_walk_space() because we can introduce | |
292 | * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same | |
293 | * function. When extent status tree has been fully implemented, it will | |
294 | * track all extent status for a file and we can directly use it to | |
295 | * retrieve the offset for SEEK_DATA/SEEK_HOLE. | |
296 | */ | |
297 | ||
298 | /* | |
299 | * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to | |
300 | * lookup page cache to check whether or not there has some data between | |
301 | * [startoff, endoff] because, if this range contains an unwritten extent, | |
302 | * we determine this extent as a data or a hole according to whether the | |
303 | * page cache has data or not. | |
304 | */ | |
305 | static int ext4_find_unwritten_pgoff(struct inode *inode, | |
306 | int origin, | |
307 | struct ext4_map_blocks *map, | |
308 | loff_t *offset) | |
309 | { | |
310 | struct pagevec pvec; | |
311 | unsigned int blkbits; | |
312 | pgoff_t index; | |
313 | pgoff_t end; | |
314 | loff_t endoff; | |
315 | loff_t startoff; | |
316 | loff_t lastoff; | |
317 | int found = 0; | |
318 | ||
319 | blkbits = inode->i_sb->s_blocksize_bits; | |
320 | startoff = *offset; | |
321 | lastoff = startoff; | |
322 | endoff = (map->m_lblk + map->m_len) << blkbits; | |
323 | ||
324 | index = startoff >> PAGE_CACHE_SHIFT; | |
325 | end = endoff >> PAGE_CACHE_SHIFT; | |
326 | ||
327 | pagevec_init(&pvec, 0); | |
328 | do { | |
329 | int i, num; | |
330 | unsigned long nr_pages; | |
331 | ||
332 | num = min_t(pgoff_t, end - index, PAGEVEC_SIZE); | |
333 | nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index, | |
334 | (pgoff_t)num); | |
335 | if (nr_pages == 0) { | |
336 | if (origin == SEEK_DATA) | |
337 | break; | |
338 | ||
339 | BUG_ON(origin != SEEK_HOLE); | |
340 | /* | |
341 | * If this is the first time to go into the loop and | |
342 | * offset is not beyond the end offset, it will be a | |
343 | * hole at this offset | |
344 | */ | |
345 | if (lastoff == startoff || lastoff < endoff) | |
346 | found = 1; | |
347 | break; | |
348 | } | |
349 | ||
350 | /* | |
351 | * If this is the first time to go into the loop and | |
352 | * offset is smaller than the first page offset, it will be a | |
353 | * hole at this offset. | |
354 | */ | |
355 | if (lastoff == startoff && origin == SEEK_HOLE && | |
356 | lastoff < page_offset(pvec.pages[0])) { | |
357 | found = 1; | |
358 | break; | |
359 | } | |
360 | ||
361 | for (i = 0; i < nr_pages; i++) { | |
362 | struct page *page = pvec.pages[i]; | |
363 | struct buffer_head *bh, *head; | |
364 | ||
365 | /* | |
366 | * If the current offset is not beyond the end of given | |
367 | * range, it will be a hole. | |
368 | */ | |
369 | if (lastoff < endoff && origin == SEEK_HOLE && | |
370 | page->index > end) { | |
371 | found = 1; | |
372 | *offset = lastoff; | |
373 | goto out; | |
374 | } | |
375 | ||
376 | lock_page(page); | |
377 | ||
378 | if (unlikely(page->mapping != inode->i_mapping)) { | |
379 | unlock_page(page); | |
380 | continue; | |
381 | } | |
382 | ||
383 | if (!page_has_buffers(page)) { | |
384 | unlock_page(page); | |
385 | continue; | |
386 | } | |
387 | ||
388 | if (page_has_buffers(page)) { | |
389 | lastoff = page_offset(page); | |
390 | bh = head = page_buffers(page); | |
391 | do { | |
392 | if (buffer_uptodate(bh) || | |
393 | buffer_unwritten(bh)) { | |
394 | if (origin == SEEK_DATA) | |
395 | found = 1; | |
396 | } else { | |
397 | if (origin == SEEK_HOLE) | |
398 | found = 1; | |
399 | } | |
400 | if (found) { | |
401 | *offset = max_t(loff_t, | |
402 | startoff, lastoff); | |
403 | unlock_page(page); | |
404 | goto out; | |
405 | } | |
406 | lastoff += bh->b_size; | |
407 | bh = bh->b_this_page; | |
408 | } while (bh != head); | |
409 | } | |
410 | ||
411 | lastoff = page_offset(page) + PAGE_SIZE; | |
412 | unlock_page(page); | |
413 | } | |
414 | ||
415 | /* | |
416 | * The no. of pages is less than our desired, that would be a | |
417 | * hole in there. | |
418 | */ | |
419 | if (nr_pages < num && origin == SEEK_HOLE) { | |
420 | found = 1; | |
421 | *offset = lastoff; | |
422 | break; | |
423 | } | |
424 | ||
425 | index = pvec.pages[i - 1]->index + 1; | |
426 | pagevec_release(&pvec); | |
427 | } while (index <= end); | |
428 | ||
429 | out: | |
430 | pagevec_release(&pvec); | |
431 | return found; | |
432 | } | |
433 | ||
434 | /* | |
435 | * ext4_seek_data() retrieves the offset for SEEK_DATA. | |
436 | */ | |
437 | static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize) | |
438 | { | |
439 | struct inode *inode = file->f_mapping->host; | |
440 | struct ext4_map_blocks map; | |
441 | struct extent_status es; | |
442 | ext4_lblk_t start, last, end; | |
443 | loff_t dataoff, isize; | |
444 | int blkbits; | |
445 | int ret = 0; | |
446 | ||
447 | mutex_lock(&inode->i_mutex); | |
448 | ||
449 | isize = i_size_read(inode); | |
450 | if (offset >= isize) { | |
451 | mutex_unlock(&inode->i_mutex); | |
452 | return -ENXIO; | |
453 | } | |
454 | ||
455 | blkbits = inode->i_sb->s_blocksize_bits; | |
456 | start = offset >> blkbits; | |
457 | last = start; | |
458 | end = isize >> blkbits; | |
459 | dataoff = offset; | |
460 | ||
461 | do { | |
462 | map.m_lblk = last; | |
463 | map.m_len = end - last + 1; | |
464 | ret = ext4_map_blocks(NULL, inode, &map, 0); | |
465 | if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) { | |
466 | if (last != start) | |
467 | dataoff = last << blkbits; | |
468 | break; | |
469 | } | |
470 | ||
471 | /* | |
472 | * If there is a delay extent at this offset, | |
473 | * it will be as a data. | |
474 | */ | |
475 | es.start = last; | |
476 | (void)ext4_es_find_extent(inode, &es); | |
477 | if (last >= es.start && | |
478 | last < es.start + es.len) { | |
479 | if (last != start) | |
480 | dataoff = last << blkbits; | |
481 | break; | |
482 | } | |
483 | ||
484 | /* | |
485 | * If there is a unwritten extent at this offset, | |
486 | * it will be as a data or a hole according to page | |
487 | * cache that has data or not. | |
488 | */ | |
489 | if (map.m_flags & EXT4_MAP_UNWRITTEN) { | |
490 | int unwritten; | |
491 | unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA, | |
492 | &map, &dataoff); | |
493 | if (unwritten) | |
494 | break; | |
495 | } | |
496 | ||
497 | last++; | |
498 | dataoff = last << blkbits; | |
499 | } while (last <= end); | |
500 | ||
501 | mutex_unlock(&inode->i_mutex); | |
502 | ||
503 | if (dataoff > isize) | |
504 | return -ENXIO; | |
505 | ||
506 | if (dataoff < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) | |
507 | return -EINVAL; | |
508 | if (dataoff > maxsize) | |
509 | return -EINVAL; | |
510 | ||
511 | if (dataoff != file->f_pos) { | |
512 | file->f_pos = dataoff; | |
513 | file->f_version = 0; | |
514 | } | |
515 | ||
516 | return dataoff; | |
517 | } | |
518 | ||
519 | /* | |
520 | * ext4_seek_hole() retrieves the offset for SEEK_HOLE. | |
521 | */ | |
522 | static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize) | |
523 | { | |
524 | struct inode *inode = file->f_mapping->host; | |
525 | struct ext4_map_blocks map; | |
526 | struct extent_status es; | |
527 | ext4_lblk_t start, last, end; | |
528 | loff_t holeoff, isize; | |
529 | int blkbits; | |
530 | int ret = 0; | |
531 | ||
532 | mutex_lock(&inode->i_mutex); | |
533 | ||
534 | isize = i_size_read(inode); | |
535 | if (offset >= isize) { | |
536 | mutex_unlock(&inode->i_mutex); | |
537 | return -ENXIO; | |
538 | } | |
539 | ||
540 | blkbits = inode->i_sb->s_blocksize_bits; | |
541 | start = offset >> blkbits; | |
542 | last = start; | |
543 | end = isize >> blkbits; | |
544 | holeoff = offset; | |
545 | ||
546 | do { | |
547 | map.m_lblk = last; | |
548 | map.m_len = end - last + 1; | |
549 | ret = ext4_map_blocks(NULL, inode, &map, 0); | |
550 | if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) { | |
551 | last += ret; | |
552 | holeoff = last << blkbits; | |
553 | continue; | |
554 | } | |
555 | ||
556 | /* | |
557 | * If there is a delay extent at this offset, | |
558 | * we will skip this extent. | |
559 | */ | |
560 | es.start = last; | |
561 | (void)ext4_es_find_extent(inode, &es); | |
562 | if (last >= es.start && | |
563 | last < es.start + es.len) { | |
564 | last = es.start + es.len; | |
565 | holeoff = last << blkbits; | |
566 | continue; | |
567 | } | |
568 | ||
569 | /* | |
570 | * If there is a unwritten extent at this offset, | |
571 | * it will be as a data or a hole according to page | |
572 | * cache that has data or not. | |
573 | */ | |
574 | if (map.m_flags & EXT4_MAP_UNWRITTEN) { | |
575 | int unwritten; | |
576 | unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE, | |
577 | &map, &holeoff); | |
578 | if (!unwritten) { | |
579 | last += ret; | |
580 | holeoff = last << blkbits; | |
581 | continue; | |
582 | } | |
583 | } | |
584 | ||
585 | /* find a hole */ | |
586 | break; | |
587 | } while (last <= end); | |
588 | ||
589 | mutex_unlock(&inode->i_mutex); | |
590 | ||
591 | if (holeoff > isize) | |
592 | holeoff = isize; | |
593 | ||
594 | if (holeoff < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) | |
595 | return -EINVAL; | |
596 | if (holeoff > maxsize) | |
597 | return -EINVAL; | |
598 | ||
599 | if (holeoff != file->f_pos) { | |
600 | file->f_pos = holeoff; | |
601 | file->f_version = 0; | |
602 | } | |
603 | ||
604 | return holeoff; | |
605 | } | |
606 | ||
e0d10bfa | 607 | /* |
ec7268ce ES |
608 | * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values |
609 | * by calling generic_file_llseek_size() with the appropriate maxbytes | |
610 | * value for each. | |
e0d10bfa TO |
611 | */ |
612 | loff_t ext4_llseek(struct file *file, loff_t offset, int origin) | |
613 | { | |
614 | struct inode *inode = file->f_mapping->host; | |
615 | loff_t maxbytes; | |
616 | ||
617 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) | |
618 | maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes; | |
619 | else | |
620 | maxbytes = inode->i_sb->s_maxbytes; | |
e0d10bfa | 621 | |
c8c0df24 ZL |
622 | switch (origin) { |
623 | case SEEK_SET: | |
624 | case SEEK_CUR: | |
625 | case SEEK_END: | |
626 | return generic_file_llseek_size(file, offset, origin, | |
627 | maxbytes, i_size_read(inode)); | |
628 | case SEEK_DATA: | |
629 | return ext4_seek_data(file, offset, maxbytes); | |
630 | case SEEK_HOLE: | |
631 | return ext4_seek_hole(file, offset, maxbytes); | |
632 | } | |
633 | ||
634 | return -EINVAL; | |
e0d10bfa TO |
635 | } |
636 | ||
617ba13b | 637 | const struct file_operations ext4_file_operations = { |
e0d10bfa | 638 | .llseek = ext4_llseek, |
ac27a0ec DK |
639 | .read = do_sync_read, |
640 | .write = do_sync_write, | |
641 | .aio_read = generic_file_aio_read, | |
617ba13b | 642 | .aio_write = ext4_file_write, |
5cdd7b2d | 643 | .unlocked_ioctl = ext4_ioctl, |
ac27a0ec | 644 | #ifdef CONFIG_COMPAT |
617ba13b | 645 | .compat_ioctl = ext4_compat_ioctl, |
ac27a0ec | 646 | #endif |
2e9ee850 | 647 | .mmap = ext4_file_mmap, |
bc0b0d6d | 648 | .open = ext4_file_open, |
617ba13b MC |
649 | .release = ext4_release_file, |
650 | .fsync = ext4_sync_file, | |
ac27a0ec DK |
651 | .splice_read = generic_file_splice_read, |
652 | .splice_write = generic_file_splice_write, | |
2fe17c10 | 653 | .fallocate = ext4_fallocate, |
ac27a0ec DK |
654 | }; |
655 | ||
754661f1 | 656 | const struct inode_operations ext4_file_inode_operations = { |
617ba13b | 657 | .setattr = ext4_setattr, |
3e3398a0 | 658 | .getattr = ext4_getattr, |
ac27a0ec DK |
659 | .setxattr = generic_setxattr, |
660 | .getxattr = generic_getxattr, | |
617ba13b | 661 | .listxattr = ext4_listxattr, |
ac27a0ec | 662 | .removexattr = generic_removexattr, |
4e34e719 | 663 | .get_acl = ext4_get_acl, |
6873fa0d | 664 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
665 | }; |
666 |