Commit | Line | Data |
---|---|---|
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> | |
a27bb332 | 26 | #include <linux/aio.h> |
871a2931 | 27 | #include <linux/quotaops.h> |
c8c0df24 | 28 | #include <linux/pagevec.h> |
3dcf5451 CH |
29 | #include "ext4.h" |
30 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
31 | #include "xattr.h" |
32 | #include "acl.h" | |
33 | ||
34 | /* | |
35 | * Called when an inode is released. Note that this is different | |
617ba13b | 36 | * from ext4_file_open: open gets called at every open, but release |
ac27a0ec DK |
37 | * gets called only when /all/ the files are closed. |
38 | */ | |
af5bc92d | 39 | static int ext4_release_file(struct inode *inode, struct file *filp) |
ac27a0ec | 40 | { |
19f5fb7a | 41 | if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) { |
7d8f9f7d | 42 | ext4_alloc_da_blocks(inode); |
19f5fb7a | 43 | ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE); |
7d8f9f7d | 44 | } |
ac27a0ec DK |
45 | /* if we are the last writer on the inode, drop the block reservation */ |
46 | if ((filp->f_mode & FMODE_WRITE) && | |
d6014301 AK |
47 | (atomic_read(&inode->i_writecount) == 1) && |
48 | !EXT4_I(inode)->i_reserved_data_blocks) | |
ac27a0ec | 49 | { |
0e855ac8 | 50 | down_write(&EXT4_I(inode)->i_data_sem); |
c2ea3fde | 51 | ext4_discard_preallocations(inode); |
0e855ac8 | 52 | up_write(&EXT4_I(inode)->i_data_sem); |
ac27a0ec DK |
53 | } |
54 | if (is_dx(inode) && filp->private_data) | |
617ba13b | 55 | ext4_htree_free_dir_info(filp->private_data); |
ac27a0ec DK |
56 | |
57 | return 0; | |
58 | } | |
59 | ||
c197855e | 60 | static void ext4_unwritten_wait(struct inode *inode) |
e9e3bcec ES |
61 | { |
62 | wait_queue_head_t *wq = ext4_ioend_wq(inode); | |
63 | ||
e27f41e1 | 64 | wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0)); |
e9e3bcec ES |
65 | } |
66 | ||
67 | /* | |
68 | * This tests whether the IO in question is block-aligned or not. | |
69 | * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they | |
70 | * are converted to written only after the IO is complete. Until they are | |
71 | * mapped, these blocks appear as holes, so dio_zero_block() will assume that | |
72 | * it needs to zero out portions of the start and/or end block. If 2 AIO | |
73 | * threads are at work on the same unwritten block, they must be synchronized | |
74 | * or one thread will zero the other's data, causing corruption. | |
75 | */ | |
76 | static int | |
9b884164 | 77 | ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos) |
e9e3bcec ES |
78 | { |
79 | struct super_block *sb = inode->i_sb; | |
80 | int blockmask = sb->s_blocksize - 1; | |
e9e3bcec | 81 | |
6e6358fc | 82 | if (pos >= i_size_read(inode)) |
e9e3bcec ES |
83 | return 0; |
84 | ||
9b884164 | 85 | if ((pos | iov_iter_alignment(from)) & blockmask) |
e9e3bcec ES |
86 | return 1; |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
ac27a0ec | 91 | static ssize_t |
9b884164 | 92 | ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
ac27a0ec | 93 | { |
4bd809db | 94 | struct file *file = iocb->ki_filp; |
8ad2850f | 95 | struct inode *inode = file_inode(iocb->ki_filp); |
7ed07ba8 | 96 | struct mutex *aio_mutex = NULL; |
4bd809db | 97 | struct blk_plug plug; |
923ae0ff | 98 | int o_direct = io_is_direct(file); |
4bd809db | 99 | int overwrite = 0; |
9b884164 | 100 | size_t length = iov_iter_count(from); |
8563000d | 101 | ssize_t ret; |
9b884164 | 102 | loff_t pos = iocb->ki_pos; |
7608e610 | 103 | |
f5ccfe1d TT |
104 | /* |
105 | * Unaligned direct AIO must be serialized; see comment above | |
106 | * In the case of O_APPEND, assume that we must always serialize | |
107 | */ | |
108 | if (o_direct && | |
109 | ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) && | |
110 | !is_sync_kiocb(iocb) && | |
111 | (file->f_flags & O_APPEND || | |
9b884164 | 112 | ext4_unaligned_aio(inode, from, pos))) { |
f5ccfe1d TT |
113 | aio_mutex = ext4_aio_mutex(inode); |
114 | mutex_lock(aio_mutex); | |
115 | ext4_unwritten_wait(inode); | |
116 | } | |
117 | ||
118 | mutex_lock(&inode->i_mutex); | |
119 | if (file->f_flags & O_APPEND) | |
120 | iocb->ki_pos = pos = i_size_read(inode); | |
121 | ||
e2b46574 ES |
122 | /* |
123 | * If we have encountered a bitmap-format file, the size limit | |
124 | * is smaller than s_maxbytes, which is for extent-mapped files. | |
125 | */ | |
12e9b892 | 126 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) { |
e2b46574 | 127 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
ac27a0ec | 128 | |
f5ccfe1d TT |
129 | if ((pos > sbi->s_bitmap_maxbytes) || |
130 | (pos == sbi->s_bitmap_maxbytes && length > 0)) { | |
131 | mutex_unlock(&inode->i_mutex); | |
132 | ret = -EFBIG; | |
133 | goto errout; | |
134 | } | |
e2b46574 | 135 | |
9b884164 AV |
136 | if (pos + length > sbi->s_bitmap_maxbytes) |
137 | iov_iter_truncate(from, sbi->s_bitmap_maxbytes - pos); | |
e2b46574 ES |
138 | } |
139 | ||
a41537e6 | 140 | iocb->private = &overwrite; |
7ed07ba8 | 141 | if (o_direct) { |
8ad2850f TT |
142 | blk_start_plug(&plug); |
143 | ||
8ad2850f TT |
144 | |
145 | /* check whether we do a DIO overwrite or not */ | |
7ed07ba8 | 146 | if (ext4_should_dioread_nolock(inode) && !aio_mutex && |
8ad2850f TT |
147 | !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) { |
148 | struct ext4_map_blocks map; | |
149 | unsigned int blkbits = inode->i_blkbits; | |
150 | int err, len; | |
151 | ||
152 | map.m_lblk = pos >> blkbits; | |
153 | map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits) | |
154 | - map.m_lblk; | |
155 | len = map.m_len; | |
156 | ||
157 | err = ext4_map_blocks(NULL, inode, &map, 0); | |
158 | /* | |
159 | * 'err==len' means that all of blocks has | |
160 | * been preallocated no matter they are | |
161 | * initialized or not. For excluding | |
162 | * unwritten extents, we need to check | |
163 | * m_flags. There are two conditions that | |
164 | * indicate for initialized extents. 1) If we | |
165 | * hit extent cache, EXT4_MAP_MAPPED flag is | |
166 | * returned; 2) If we do a real lookup, | |
167 | * non-flags are returned. So we should check | |
168 | * these two conditions. | |
169 | */ | |
170 | if (err == len && (map.m_flags & EXT4_MAP_MAPPED)) | |
171 | overwrite = 1; | |
172 | } | |
f5ccfe1d | 173 | } |
7608e610 | 174 | |
9b884164 | 175 | ret = __generic_file_write_iter(iocb, from); |
7ed07ba8 | 176 | mutex_unlock(&inode->i_mutex); |
7608e610 | 177 | |
7ed07ba8 TT |
178 | if (ret > 0) { |
179 | ssize_t err; | |
180 | ||
181 | err = generic_write_sync(file, iocb->ki_pos - ret, ret); | |
182 | if (err < 0) | |
183 | ret = err; | |
7608e610 | 184 | } |
7ed07ba8 TT |
185 | if (o_direct) |
186 | blk_finish_plug(&plug); | |
e9e3bcec | 187 | |
f5ccfe1d | 188 | errout: |
7ed07ba8 TT |
189 | if (aio_mutex) |
190 | mutex_unlock(aio_mutex); | |
e9e3bcec | 191 | return ret; |
ac27a0ec DK |
192 | } |
193 | ||
923ae0ff RZ |
194 | #ifdef CONFIG_FS_DAX |
195 | static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
196 | { | |
197 | return dax_fault(vma, vmf, ext4_get_block); | |
198 | /* Is this the right get_block? */ | |
199 | } | |
200 | ||
201 | static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
202 | { | |
203 | return dax_mkwrite(vma, vmf, ext4_get_block); | |
204 | } | |
205 | ||
206 | static const struct vm_operations_struct ext4_dax_vm_ops = { | |
207 | .fault = ext4_dax_fault, | |
208 | .page_mkwrite = ext4_dax_mkwrite, | |
209 | }; | |
210 | #else | |
211 | #define ext4_dax_vm_ops ext4_file_vm_ops | |
212 | #endif | |
213 | ||
f0f37e2f | 214 | static const struct vm_operations_struct ext4_file_vm_ops = { |
2e9ee850 | 215 | .fault = filemap_fault, |
f1820361 | 216 | .map_pages = filemap_map_pages, |
2e9ee850 AK |
217 | .page_mkwrite = ext4_page_mkwrite, |
218 | }; | |
219 | ||
220 | static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) | |
221 | { | |
2e9ee850 | 222 | file_accessed(file); |
923ae0ff RZ |
223 | if (IS_DAX(file_inode(file))) { |
224 | vma->vm_ops = &ext4_dax_vm_ops; | |
225 | vma->vm_flags |= VM_MIXEDMAP; | |
226 | } else { | |
227 | vma->vm_ops = &ext4_file_vm_ops; | |
228 | } | |
2e9ee850 AK |
229 | return 0; |
230 | } | |
231 | ||
bc0b0d6d TT |
232 | static int ext4_file_open(struct inode * inode, struct file * filp) |
233 | { | |
234 | struct super_block *sb = inode->i_sb; | |
235 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
236 | struct vfsmount *mnt = filp->f_path.mnt; | |
237 | struct path path; | |
238 | char buf[64], *cp; | |
239 | ||
240 | if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && | |
241 | !(sb->s_flags & MS_RDONLY))) { | |
242 | sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; | |
243 | /* | |
244 | * Sample where the filesystem has been mounted and | |
245 | * store it in the superblock for sysadmin convenience | |
246 | * when trying to sort through large numbers of block | |
247 | * devices or filesystem images. | |
248 | */ | |
249 | memset(buf, 0, sizeof(buf)); | |
3899167d AV |
250 | path.mnt = mnt; |
251 | path.dentry = mnt->mnt_root; | |
bc0b0d6d | 252 | cp = d_path(&path, buf, sizeof(buf)); |
bc0b0d6d | 253 | if (!IS_ERR(cp)) { |
044ce47f JK |
254 | handle_t *handle; |
255 | int err; | |
256 | ||
9924a92a | 257 | handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); |
044ce47f JK |
258 | if (IS_ERR(handle)) |
259 | return PTR_ERR(handle); | |
5d601255 | 260 | BUFFER_TRACE(sbi->s_sbh, "get_write_access"); |
044ce47f JK |
261 | err = ext4_journal_get_write_access(handle, sbi->s_sbh); |
262 | if (err) { | |
263 | ext4_journal_stop(handle); | |
264 | return err; | |
265 | } | |
cf803903 DW |
266 | strlcpy(sbi->s_es->s_last_mounted, cp, |
267 | sizeof(sbi->s_es->s_last_mounted)); | |
044ce47f JK |
268 | ext4_handle_dirty_super(handle, sb); |
269 | ext4_journal_stop(handle); | |
bc0b0d6d TT |
270 | } |
271 | } | |
8aefcd55 TT |
272 | /* |
273 | * Set up the jbd2_inode if we are opening the inode for | |
274 | * writing and the journal is present | |
275 | */ | |
a361293f JK |
276 | if (filp->f_mode & FMODE_WRITE) { |
277 | int ret = ext4_inode_attach_jinode(inode); | |
278 | if (ret < 0) | |
279 | return ret; | |
8aefcd55 | 280 | } |
907f4554 | 281 | return dquot_file_open(inode, filp); |
bc0b0d6d TT |
282 | } |
283 | ||
c8c0df24 ZL |
284 | /* |
285 | * Here we use ext4_map_blocks() to get a block mapping for a extent-based | |
286 | * file rather than ext4_ext_walk_space() because we can introduce | |
287 | * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same | |
288 | * function. When extent status tree has been fully implemented, it will | |
289 | * track all extent status for a file and we can directly use it to | |
290 | * retrieve the offset for SEEK_DATA/SEEK_HOLE. | |
291 | */ | |
292 | ||
293 | /* | |
294 | * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to | |
295 | * lookup page cache to check whether or not there has some data between | |
296 | * [startoff, endoff] because, if this range contains an unwritten extent, | |
297 | * we determine this extent as a data or a hole according to whether the | |
298 | * page cache has data or not. | |
299 | */ | |
ad7fefb1 TT |
300 | static int ext4_find_unwritten_pgoff(struct inode *inode, |
301 | int whence, | |
302 | struct ext4_map_blocks *map, | |
303 | loff_t *offset) | |
c8c0df24 ZL |
304 | { |
305 | struct pagevec pvec; | |
ad7fefb1 | 306 | unsigned int blkbits; |
c8c0df24 ZL |
307 | pgoff_t index; |
308 | pgoff_t end; | |
ad7fefb1 | 309 | loff_t endoff; |
c8c0df24 ZL |
310 | loff_t startoff; |
311 | loff_t lastoff; | |
312 | int found = 0; | |
313 | ||
ad7fefb1 | 314 | blkbits = inode->i_sb->s_blocksize_bits; |
c8c0df24 ZL |
315 | startoff = *offset; |
316 | lastoff = startoff; | |
ad7fefb1 | 317 | endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits; |
c8c0df24 ZL |
318 | |
319 | index = startoff >> PAGE_CACHE_SHIFT; | |
320 | end = endoff >> PAGE_CACHE_SHIFT; | |
321 | ||
322 | pagevec_init(&pvec, 0); | |
323 | do { | |
324 | int i, num; | |
325 | unsigned long nr_pages; | |
326 | ||
327 | num = min_t(pgoff_t, end - index, PAGEVEC_SIZE); | |
328 | nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index, | |
329 | (pgoff_t)num); | |
330 | if (nr_pages == 0) { | |
965c8e59 | 331 | if (whence == SEEK_DATA) |
c8c0df24 ZL |
332 | break; |
333 | ||
965c8e59 | 334 | BUG_ON(whence != SEEK_HOLE); |
c8c0df24 ZL |
335 | /* |
336 | * If this is the first time to go into the loop and | |
337 | * offset is not beyond the end offset, it will be a | |
338 | * hole at this offset | |
339 | */ | |
340 | if (lastoff == startoff || lastoff < endoff) | |
341 | found = 1; | |
342 | break; | |
343 | } | |
344 | ||
345 | /* | |
346 | * If this is the first time to go into the loop and | |
347 | * offset is smaller than the first page offset, it will be a | |
348 | * hole at this offset. | |
349 | */ | |
965c8e59 | 350 | if (lastoff == startoff && whence == SEEK_HOLE && |
c8c0df24 ZL |
351 | lastoff < page_offset(pvec.pages[0])) { |
352 | found = 1; | |
353 | break; | |
354 | } | |
355 | ||
356 | for (i = 0; i < nr_pages; i++) { | |
357 | struct page *page = pvec.pages[i]; | |
358 | struct buffer_head *bh, *head; | |
359 | ||
360 | /* | |
361 | * If the current offset is not beyond the end of given | |
362 | * range, it will be a hole. | |
363 | */ | |
965c8e59 | 364 | if (lastoff < endoff && whence == SEEK_HOLE && |
c8c0df24 ZL |
365 | page->index > end) { |
366 | found = 1; | |
367 | *offset = lastoff; | |
368 | goto out; | |
369 | } | |
370 | ||
371 | lock_page(page); | |
372 | ||
373 | if (unlikely(page->mapping != inode->i_mapping)) { | |
374 | unlock_page(page); | |
375 | continue; | |
376 | } | |
377 | ||
378 | if (!page_has_buffers(page)) { | |
379 | unlock_page(page); | |
380 | continue; | |
381 | } | |
382 | ||
383 | if (page_has_buffers(page)) { | |
384 | lastoff = page_offset(page); | |
385 | bh = head = page_buffers(page); | |
386 | do { | |
387 | if (buffer_uptodate(bh) || | |
388 | buffer_unwritten(bh)) { | |
965c8e59 | 389 | if (whence == SEEK_DATA) |
c8c0df24 ZL |
390 | found = 1; |
391 | } else { | |
965c8e59 | 392 | if (whence == SEEK_HOLE) |
c8c0df24 ZL |
393 | found = 1; |
394 | } | |
395 | if (found) { | |
396 | *offset = max_t(loff_t, | |
397 | startoff, lastoff); | |
398 | unlock_page(page); | |
399 | goto out; | |
400 | } | |
401 | lastoff += bh->b_size; | |
402 | bh = bh->b_this_page; | |
403 | } while (bh != head); | |
404 | } | |
405 | ||
406 | lastoff = page_offset(page) + PAGE_SIZE; | |
407 | unlock_page(page); | |
408 | } | |
409 | ||
410 | /* | |
411 | * The no. of pages is less than our desired, that would be a | |
412 | * hole in there. | |
413 | */ | |
965c8e59 | 414 | if (nr_pages < num && whence == SEEK_HOLE) { |
c8c0df24 ZL |
415 | found = 1; |
416 | *offset = lastoff; | |
417 | break; | |
418 | } | |
419 | ||
420 | index = pvec.pages[i - 1]->index + 1; | |
421 | pagevec_release(&pvec); | |
422 | } while (index <= end); | |
423 | ||
424 | out: | |
425 | pagevec_release(&pvec); | |
426 | return found; | |
427 | } | |
428 | ||
429 | /* | |
430 | * ext4_seek_data() retrieves the offset for SEEK_DATA. | |
431 | */ | |
432 | static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize) | |
433 | { | |
434 | struct inode *inode = file->f_mapping->host; | |
ad7fefb1 TT |
435 | struct ext4_map_blocks map; |
436 | struct extent_status es; | |
437 | ext4_lblk_t start, last, end; | |
438 | loff_t dataoff, isize; | |
439 | int blkbits; | |
440 | int ret = 0; | |
c8c0df24 ZL |
441 | |
442 | mutex_lock(&inode->i_mutex); | |
ad7fefb1 TT |
443 | |
444 | isize = i_size_read(inode); | |
445 | if (offset >= isize) { | |
c8c0df24 ZL |
446 | mutex_unlock(&inode->i_mutex); |
447 | return -ENXIO; | |
448 | } | |
ad7fefb1 TT |
449 | |
450 | blkbits = inode->i_sb->s_blocksize_bits; | |
451 | start = offset >> blkbits; | |
452 | last = start; | |
453 | end = isize >> blkbits; | |
454 | dataoff = offset; | |
455 | ||
456 | do { | |
457 | map.m_lblk = last; | |
458 | map.m_len = end - last + 1; | |
459 | ret = ext4_map_blocks(NULL, inode, &map, 0); | |
460 | if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) { | |
461 | if (last != start) | |
462 | dataoff = (loff_t)last << blkbits; | |
c8c0df24 | 463 | break; |
ad7fefb1 | 464 | } |
c8c0df24 | 465 | |
ad7fefb1 TT |
466 | /* |
467 | * If there is a delay extent at this offset, | |
468 | * it will be as a data. | |
469 | */ | |
470 | ext4_es_find_delayed_extent_range(inode, last, last, &es); | |
471 | if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) { | |
472 | if (last != start) | |
473 | dataoff = (loff_t)last << blkbits; | |
c8c0df24 ZL |
474 | break; |
475 | } | |
476 | ||
ad7fefb1 TT |
477 | /* |
478 | * If there is a unwritten extent at this offset, | |
479 | * it will be as a data or a hole according to page | |
480 | * cache that has data or not. | |
481 | */ | |
482 | if (map.m_flags & EXT4_MAP_UNWRITTEN) { | |
483 | int unwritten; | |
484 | unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA, | |
485 | &map, &dataoff); | |
486 | if (unwritten) | |
487 | break; | |
488 | } | |
c8c0df24 | 489 | |
ad7fefb1 TT |
490 | last++; |
491 | dataoff = (loff_t)last << blkbits; | |
492 | } while (last <= end); | |
c8c0df24 ZL |
493 | |
494 | mutex_unlock(&inode->i_mutex); | |
495 | ||
ad7fefb1 TT |
496 | if (dataoff > isize) |
497 | return -ENXIO; | |
498 | ||
499 | return vfs_setpos(file, dataoff, maxsize); | |
c8c0df24 ZL |
500 | } |
501 | ||
502 | /* | |
ad7fefb1 | 503 | * ext4_seek_hole() retrieves the offset for SEEK_HOLE. |
c8c0df24 ZL |
504 | */ |
505 | static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize) | |
506 | { | |
507 | struct inode *inode = file->f_mapping->host; | |
ad7fefb1 TT |
508 | struct ext4_map_blocks map; |
509 | struct extent_status es; | |
510 | ext4_lblk_t start, last, end; | |
511 | loff_t holeoff, isize; | |
512 | int blkbits; | |
513 | int ret = 0; | |
c8c0df24 ZL |
514 | |
515 | mutex_lock(&inode->i_mutex); | |
ad7fefb1 TT |
516 | |
517 | isize = i_size_read(inode); | |
518 | if (offset >= isize) { | |
c8c0df24 ZL |
519 | mutex_unlock(&inode->i_mutex); |
520 | return -ENXIO; | |
521 | } | |
522 | ||
ad7fefb1 TT |
523 | blkbits = inode->i_sb->s_blocksize_bits; |
524 | start = offset >> blkbits; | |
525 | last = start; | |
526 | end = isize >> blkbits; | |
527 | holeoff = offset; | |
c8c0df24 | 528 | |
ad7fefb1 TT |
529 | do { |
530 | map.m_lblk = last; | |
531 | map.m_len = end - last + 1; | |
532 | ret = ext4_map_blocks(NULL, inode, &map, 0); | |
533 | if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) { | |
534 | last += ret; | |
535 | holeoff = (loff_t)last << blkbits; | |
536 | continue; | |
537 | } | |
c8c0df24 | 538 | |
ad7fefb1 TT |
539 | /* |
540 | * If there is a delay extent at this offset, | |
541 | * we will skip this extent. | |
542 | */ | |
543 | ext4_es_find_delayed_extent_range(inode, last, last, &es); | |
544 | if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) { | |
545 | last = es.es_lblk + es.es_len; | |
546 | holeoff = (loff_t)last << blkbits; | |
547 | continue; | |
548 | } | |
14516bb7 | 549 | |
ad7fefb1 TT |
550 | /* |
551 | * If there is a unwritten extent at this offset, | |
552 | * it will be as a data or a hole according to page | |
553 | * cache that has data or not. | |
554 | */ | |
555 | if (map.m_flags & EXT4_MAP_UNWRITTEN) { | |
556 | int unwritten; | |
557 | unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE, | |
558 | &map, &holeoff); | |
559 | if (!unwritten) { | |
560 | last += ret; | |
561 | holeoff = (loff_t)last << blkbits; | |
c8c0df24 ZL |
562 | continue; |
563 | } | |
14516bb7 | 564 | } |
ad7fefb1 TT |
565 | |
566 | /* find a hole */ | |
567 | break; | |
568 | } while (last <= end); | |
569 | ||
c8c0df24 ZL |
570 | mutex_unlock(&inode->i_mutex); |
571 | ||
ad7fefb1 TT |
572 | if (holeoff > isize) |
573 | holeoff = isize; | |
574 | ||
575 | return vfs_setpos(file, holeoff, maxsize); | |
c8c0df24 ZL |
576 | } |
577 | ||
e0d10bfa | 578 | /* |
ec7268ce ES |
579 | * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values |
580 | * by calling generic_file_llseek_size() with the appropriate maxbytes | |
581 | * value for each. | |
e0d10bfa | 582 | */ |
965c8e59 | 583 | loff_t ext4_llseek(struct file *file, loff_t offset, int whence) |
e0d10bfa TO |
584 | { |
585 | struct inode *inode = file->f_mapping->host; | |
586 | loff_t maxbytes; | |
587 | ||
588 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) | |
589 | maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes; | |
590 | else | |
591 | maxbytes = inode->i_sb->s_maxbytes; | |
e0d10bfa | 592 | |
965c8e59 | 593 | switch (whence) { |
c8c0df24 ZL |
594 | case SEEK_SET: |
595 | case SEEK_CUR: | |
596 | case SEEK_END: | |
965c8e59 | 597 | return generic_file_llseek_size(file, offset, whence, |
c8c0df24 ZL |
598 | maxbytes, i_size_read(inode)); |
599 | case SEEK_DATA: | |
600 | return ext4_seek_data(file, offset, maxbytes); | |
601 | case SEEK_HOLE: | |
602 | return ext4_seek_hole(file, offset, maxbytes); | |
603 | } | |
604 | ||
605 | return -EINVAL; | |
e0d10bfa TO |
606 | } |
607 | ||
617ba13b | 608 | const struct file_operations ext4_file_operations = { |
e0d10bfa | 609 | .llseek = ext4_llseek, |
aad4f8bb | 610 | .read = new_sync_read, |
9b884164 | 611 | .write = new_sync_write, |
aad4f8bb | 612 | .read_iter = generic_file_read_iter, |
9b884164 | 613 | .write_iter = ext4_file_write_iter, |
5cdd7b2d | 614 | .unlocked_ioctl = ext4_ioctl, |
ac27a0ec | 615 | #ifdef CONFIG_COMPAT |
617ba13b | 616 | .compat_ioctl = ext4_compat_ioctl, |
ac27a0ec | 617 | #endif |
2e9ee850 | 618 | .mmap = ext4_file_mmap, |
bc0b0d6d | 619 | .open = ext4_file_open, |
617ba13b MC |
620 | .release = ext4_release_file, |
621 | .fsync = ext4_sync_file, | |
ac27a0ec | 622 | .splice_read = generic_file_splice_read, |
8d020765 | 623 | .splice_write = iter_file_splice_write, |
2fe17c10 | 624 | .fallocate = ext4_fallocate, |
ac27a0ec DK |
625 | }; |
626 | ||
923ae0ff RZ |
627 | #ifdef CONFIG_FS_DAX |
628 | const struct file_operations ext4_dax_file_operations = { | |
629 | .llseek = ext4_llseek, | |
630 | .read = new_sync_read, | |
631 | .write = new_sync_write, | |
632 | .read_iter = generic_file_read_iter, | |
633 | .write_iter = ext4_file_write_iter, | |
634 | .unlocked_ioctl = ext4_ioctl, | |
635 | #ifdef CONFIG_COMPAT | |
636 | .compat_ioctl = ext4_compat_ioctl, | |
637 | #endif | |
638 | .mmap = ext4_file_mmap, | |
639 | .open = ext4_file_open, | |
640 | .release = ext4_release_file, | |
641 | .fsync = ext4_sync_file, | |
642 | /* Splice not yet supported with DAX */ | |
643 | .fallocate = ext4_fallocate, | |
644 | }; | |
645 | #endif | |
646 | ||
754661f1 | 647 | const struct inode_operations ext4_file_inode_operations = { |
617ba13b | 648 | .setattr = ext4_setattr, |
3e3398a0 | 649 | .getattr = ext4_getattr, |
ac27a0ec DK |
650 | .setxattr = generic_setxattr, |
651 | .getxattr = generic_getxattr, | |
617ba13b | 652 | .listxattr = ext4_listxattr, |
ac27a0ec | 653 | .removexattr = generic_removexattr, |
4e34e719 | 654 | .get_acl = ext4_get_acl, |
64e178a7 | 655 | .set_acl = ext4_set_acl, |
6873fa0d | 656 | .fiemap = ext4_fiemap, |
ac27a0ec DK |
657 | }; |
658 |