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1/*
2 * linux/fs/ext4/file.c
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 *
15 * ext4 fs regular file handling primitives
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>
23#include <linux/mount.h>
24#include <linux/path.h>
25#include <linux/dax.h>
26#include <linux/quotaops.h>
27#include <linux/pagevec.h>
28#include <linux/uio.h>
29#include "ext4.h"
30#include "ext4_jbd2.h"
31#include "xattr.h"
32#include "acl.h"
33
34/*
35 * Called when an inode is released. Note that this is different
36 * from ext4_file_open: open gets called at every open, but release
37 * gets called only when /all/ the files are closed.
38 */
39static int ext4_release_file(struct inode *inode, struct file *filp)
40{
41 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
42 ext4_alloc_da_blocks(inode);
43 ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
44 }
45 /* if we are the last writer on the inode, drop the block reservation */
46 if ((filp->f_mode & FMODE_WRITE) &&
47 (atomic_read(&inode->i_writecount) == 1) &&
48 !EXT4_I(inode)->i_reserved_data_blocks)
49 {
50 down_write(&EXT4_I(inode)->i_data_sem);
51 ext4_discard_preallocations(inode);
52 up_write(&EXT4_I(inode)->i_data_sem);
53 }
54 if (is_dx(inode) && filp->private_data)
55 ext4_htree_free_dir_info(filp->private_data);
56
57 return 0;
58}
59
60static void ext4_unwritten_wait(struct inode *inode)
61{
62 wait_queue_head_t *wq = ext4_ioend_wq(inode);
63
64 wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
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 */
76static int
77ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos)
78{
79 struct super_block *sb = inode->i_sb;
80 int blockmask = sb->s_blocksize - 1;
81
82 if (pos >= i_size_read(inode))
83 return 0;
84
85 if ((pos | iov_iter_alignment(from)) & blockmask)
86 return 1;
87
88 return 0;
89}
90
91static ssize_t
92ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
93{
94 struct file *file = iocb->ki_filp;
95 struct inode *inode = file_inode(iocb->ki_filp);
96 struct blk_plug plug;
97 int o_direct = iocb->ki_flags & IOCB_DIRECT;
98 int unaligned_aio = 0;
99 int overwrite = 0;
100 ssize_t ret;
101
102 inode_lock(inode);
103 ret = generic_write_checks(iocb, from);
104 if (ret <= 0)
105 goto out;
106
107 /*
108 * Unaligned direct AIO must be serialized among each other as zeroing
109 * of partial blocks of two competing unaligned AIOs can result in data
110 * corruption.
111 */
112 if (o_direct && ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
113 !is_sync_kiocb(iocb) &&
114 ext4_unaligned_aio(inode, from, iocb->ki_pos)) {
115 unaligned_aio = 1;
116 ext4_unwritten_wait(inode);
117 }
118
119 /*
120 * If we have encountered a bitmap-format file, the size limit
121 * is smaller than s_maxbytes, which is for extent-mapped files.
122 */
123 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
124 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
125
126 if (iocb->ki_pos >= sbi->s_bitmap_maxbytes) {
127 ret = -EFBIG;
128 goto out;
129 }
130 iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
131 }
132
133 iocb->private = &overwrite;
134 if (o_direct) {
135 size_t length = iov_iter_count(from);
136 loff_t pos = iocb->ki_pos;
137 blk_start_plug(&plug);
138
139 /* check whether we do a DIO overwrite or not */
140 if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
141 !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
142 struct ext4_map_blocks map;
143 unsigned int blkbits = inode->i_blkbits;
144 int err, len;
145
146 map.m_lblk = pos >> blkbits;
147 map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
148 - map.m_lblk;
149 len = map.m_len;
150
151 err = ext4_map_blocks(NULL, inode, &map, 0);
152 /*
153 * 'err==len' means that all of blocks has
154 * been preallocated no matter they are
155 * initialized or not. For excluding
156 * unwritten extents, we need to check
157 * m_flags. There are two conditions that
158 * indicate for initialized extents. 1) If we
159 * hit extent cache, EXT4_MAP_MAPPED flag is
160 * returned; 2) If we do a real lookup,
161 * non-flags are returned. So we should check
162 * these two conditions.
163 */
164 if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
165 overwrite = 1;
166 }
167 }
168
169 ret = __generic_file_write_iter(iocb, from);
170 inode_unlock(inode);
171
172 if (ret > 0) {
173 ssize_t err;
174
175 err = generic_write_sync(file, iocb->ki_pos - ret, ret);
176 if (err < 0)
177 ret = err;
178 }
179 if (o_direct)
180 blk_finish_plug(&plug);
181
182 return ret;
183
184out:
185 inode_unlock(inode);
186 return ret;
187}
188
189#ifdef CONFIG_FS_DAX
190static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
191{
192 int result;
193 handle_t *handle = NULL;
194 struct inode *inode = file_inode(vma->vm_file);
195 struct super_block *sb = inode->i_sb;
196 bool write = vmf->flags & FAULT_FLAG_WRITE;
197
198 if (write) {
199 sb_start_pagefault(sb);
200 file_update_time(vma->vm_file);
201 down_read(&EXT4_I(inode)->i_mmap_sem);
202 handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
203 EXT4_DATA_TRANS_BLOCKS(sb));
204 } else
205 down_read(&EXT4_I(inode)->i_mmap_sem);
206
207 if (IS_ERR(handle))
208 result = VM_FAULT_SIGBUS;
209 else
210 result = __dax_fault(vma, vmf, ext4_dax_mmap_get_block, NULL);
211
212 if (write) {
213 if (!IS_ERR(handle))
214 ext4_journal_stop(handle);
215 up_read(&EXT4_I(inode)->i_mmap_sem);
216 sb_end_pagefault(sb);
217 } else
218 up_read(&EXT4_I(inode)->i_mmap_sem);
219
220 return result;
221}
222
223static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
224 pmd_t *pmd, unsigned int flags)
225{
226 int result;
227 handle_t *handle = NULL;
228 struct inode *inode = file_inode(vma->vm_file);
229 struct super_block *sb = inode->i_sb;
230 bool write = flags & FAULT_FLAG_WRITE;
231
232 if (write) {
233 sb_start_pagefault(sb);
234 file_update_time(vma->vm_file);
235 down_read(&EXT4_I(inode)->i_mmap_sem);
236 handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
237 ext4_chunk_trans_blocks(inode,
238 PMD_SIZE / PAGE_SIZE));
239 } else
240 down_read(&EXT4_I(inode)->i_mmap_sem);
241
242 if (IS_ERR(handle))
243 result = VM_FAULT_SIGBUS;
244 else
245 result = __dax_pmd_fault(vma, addr, pmd, flags,
246 ext4_dax_mmap_get_block, NULL);
247
248 if (write) {
249 if (!IS_ERR(handle))
250 ext4_journal_stop(handle);
251 up_read(&EXT4_I(inode)->i_mmap_sem);
252 sb_end_pagefault(sb);
253 } else
254 up_read(&EXT4_I(inode)->i_mmap_sem);
255
256 return result;
257}
258
259/*
260 * Handle write fault for VM_MIXEDMAP mappings. Similarly to ext4_dax_fault()
261 * handler we check for races agaist truncate. Note that since we cycle through
262 * i_mmap_sem, we are sure that also any hole punching that began before we
263 * were called is finished by now and so if it included part of the file we
264 * are working on, our pte will get unmapped and the check for pte_same() in
265 * wp_pfn_shared() fails. Thus fault gets retried and things work out as
266 * desired.
267 */
268static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma,
269 struct vm_fault *vmf)
270{
271 struct inode *inode = file_inode(vma->vm_file);
272 struct super_block *sb = inode->i_sb;
273 loff_t size;
274 int ret;
275
276 sb_start_pagefault(sb);
277 file_update_time(vma->vm_file);
278 down_read(&EXT4_I(inode)->i_mmap_sem);
279 size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
280 if (vmf->pgoff >= size)
281 ret = VM_FAULT_SIGBUS;
282 else
283 ret = dax_pfn_mkwrite(vma, vmf);
284 up_read(&EXT4_I(inode)->i_mmap_sem);
285 sb_end_pagefault(sb);
286
287 return ret;
288}
289
290static const struct vm_operations_struct ext4_dax_vm_ops = {
291 .fault = ext4_dax_fault,
292 .pmd_fault = ext4_dax_pmd_fault,
293 .page_mkwrite = ext4_dax_fault,
294 .pfn_mkwrite = ext4_dax_pfn_mkwrite,
295};
296#else
297#define ext4_dax_vm_ops ext4_file_vm_ops
298#endif
299
300static const struct vm_operations_struct ext4_file_vm_ops = {
301 .fault = ext4_filemap_fault,
302 .map_pages = filemap_map_pages,
303 .page_mkwrite = ext4_page_mkwrite,
304};
305
306static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
307{
308 struct inode *inode = file->f_mapping->host;
309
310 if (ext4_encrypted_inode(inode)) {
311 int err = ext4_get_encryption_info(inode);
312 if (err)
313 return 0;
314 if (ext4_encryption_info(inode) == NULL)
315 return -ENOKEY;
316 }
317 file_accessed(file);
318 if (IS_DAX(file_inode(file))) {
319 vma->vm_ops = &ext4_dax_vm_ops;
320 vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
321 } else {
322 vma->vm_ops = &ext4_file_vm_ops;
323 }
324 return 0;
325}
326
327static int ext4_file_open(struct inode * inode, struct file * filp)
328{
329 struct super_block *sb = inode->i_sb;
330 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
331 struct vfsmount *mnt = filp->f_path.mnt;
332 struct dentry *dir;
333 struct path path;
334 char buf[64], *cp;
335 int ret;
336
337 if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
338 !(sb->s_flags & MS_RDONLY))) {
339 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
340 /*
341 * Sample where the filesystem has been mounted and
342 * store it in the superblock for sysadmin convenience
343 * when trying to sort through large numbers of block
344 * devices or filesystem images.
345 */
346 memset(buf, 0, sizeof(buf));
347 path.mnt = mnt;
348 path.dentry = mnt->mnt_root;
349 cp = d_path(&path, buf, sizeof(buf));
350 if (!IS_ERR(cp)) {
351 handle_t *handle;
352 int err;
353
354 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
355 if (IS_ERR(handle))
356 return PTR_ERR(handle);
357 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
358 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
359 if (err) {
360 ext4_journal_stop(handle);
361 return err;
362 }
363 strlcpy(sbi->s_es->s_last_mounted, cp,
364 sizeof(sbi->s_es->s_last_mounted));
365 ext4_handle_dirty_super(handle, sb);
366 ext4_journal_stop(handle);
367 }
368 }
369 if (ext4_encrypted_inode(inode)) {
370 ret = ext4_get_encryption_info(inode);
371 if (ret)
372 return -EACCES;
373 if (ext4_encryption_info(inode) == NULL)
374 return -ENOKEY;
375 }
376
377 dir = dget_parent(file_dentry(filp));
378 if (ext4_encrypted_inode(d_inode(dir)) &&
379 !ext4_is_child_context_consistent_with_parent(d_inode(dir), inode)) {
380 ext4_warning(inode->i_sb,
381 "Inconsistent encryption contexts: %lu/%lu\n",
382 (unsigned long) d_inode(dir)->i_ino,
383 (unsigned long) inode->i_ino);
384 dput(dir);
385 return -EPERM;
386 }
387 dput(dir);
388 /*
389 * Set up the jbd2_inode if we are opening the inode for
390 * writing and the journal is present
391 */
392 if (filp->f_mode & FMODE_WRITE) {
393 ret = ext4_inode_attach_jinode(inode);
394 if (ret < 0)
395 return ret;
396 }
397 return dquot_file_open(inode, filp);
398}
399
400/*
401 * Here we use ext4_map_blocks() to get a block mapping for a extent-based
402 * file rather than ext4_ext_walk_space() because we can introduce
403 * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
404 * function. When extent status tree has been fully implemented, it will
405 * track all extent status for a file and we can directly use it to
406 * retrieve the offset for SEEK_DATA/SEEK_HOLE.
407 */
408
409/*
410 * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
411 * lookup page cache to check whether or not there has some data between
412 * [startoff, endoff] because, if this range contains an unwritten extent,
413 * we determine this extent as a data or a hole according to whether the
414 * page cache has data or not.
415 */
416static int ext4_find_unwritten_pgoff(struct inode *inode,
417 int whence,
418 ext4_lblk_t end_blk,
419 loff_t *offset)
420{
421 struct pagevec pvec;
422 unsigned int blkbits;
423 pgoff_t index;
424 pgoff_t end;
425 loff_t endoff;
426 loff_t startoff;
427 loff_t lastoff;
428 int found = 0;
429
430 blkbits = inode->i_sb->s_blocksize_bits;
431 startoff = *offset;
432 lastoff = startoff;
433 endoff = (loff_t)end_blk << blkbits;
434
435 index = startoff >> PAGE_SHIFT;
436 end = endoff >> PAGE_SHIFT;
437
438 pagevec_init(&pvec, 0);
439 do {
440 int i, num;
441 unsigned long nr_pages;
442
443 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
444 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
445 (pgoff_t)num);
446 if (nr_pages == 0) {
447 if (whence == SEEK_DATA)
448 break;
449
450 BUG_ON(whence != SEEK_HOLE);
451 /*
452 * If this is the first time to go into the loop and
453 * offset is not beyond the end offset, it will be a
454 * hole at this offset
455 */
456 if (lastoff == startoff || lastoff < endoff)
457 found = 1;
458 break;
459 }
460
461 /*
462 * If this is the first time to go into the loop and
463 * offset is smaller than the first page offset, it will be a
464 * hole at this offset.
465 */
466 if (lastoff == startoff && whence == SEEK_HOLE &&
467 lastoff < page_offset(pvec.pages[0])) {
468 found = 1;
469 break;
470 }
471
472 for (i = 0; i < nr_pages; i++) {
473 struct page *page = pvec.pages[i];
474 struct buffer_head *bh, *head;
475
476 /*
477 * If the current offset is not beyond the end of given
478 * range, it will be a hole.
479 */
480 if (lastoff < endoff && whence == SEEK_HOLE &&
481 page->index > end) {
482 found = 1;
483 *offset = lastoff;
484 goto out;
485 }
486
487 lock_page(page);
488
489 if (unlikely(page->mapping != inode->i_mapping)) {
490 unlock_page(page);
491 continue;
492 }
493
494 if (!page_has_buffers(page)) {
495 unlock_page(page);
496 continue;
497 }
498
499 if (page_has_buffers(page)) {
500 lastoff = page_offset(page);
501 bh = head = page_buffers(page);
502 do {
503 if (buffer_uptodate(bh) ||
504 buffer_unwritten(bh)) {
505 if (whence == SEEK_DATA)
506 found = 1;
507 } else {
508 if (whence == SEEK_HOLE)
509 found = 1;
510 }
511 if (found) {
512 *offset = max_t(loff_t,
513 startoff, lastoff);
514 unlock_page(page);
515 goto out;
516 }
517 lastoff += bh->b_size;
518 bh = bh->b_this_page;
519 } while (bh != head);
520 }
521
522 lastoff = page_offset(page) + PAGE_SIZE;
523 unlock_page(page);
524 }
525
526 /*
527 * The no. of pages is less than our desired, that would be a
528 * hole in there.
529 */
530 if (nr_pages < num && whence == SEEK_HOLE) {
531 found = 1;
532 *offset = lastoff;
533 break;
534 }
535
536 index = pvec.pages[i - 1]->index + 1;
537 pagevec_release(&pvec);
538 } while (index <= end);
539
540out:
541 pagevec_release(&pvec);
542 return found;
543}
544
545/*
546 * ext4_seek_data() retrieves the offset for SEEK_DATA.
547 */
548static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
549{
550 struct inode *inode = file->f_mapping->host;
551 struct extent_status es;
552 ext4_lblk_t start, last, end;
553 loff_t dataoff, isize;
554 int blkbits;
555 int ret;
556
557 inode_lock(inode);
558
559 isize = i_size_read(inode);
560 if (offset >= isize) {
561 inode_unlock(inode);
562 return -ENXIO;
563 }
564
565 blkbits = inode->i_sb->s_blocksize_bits;
566 start = offset >> blkbits;
567 last = start;
568 end = isize >> blkbits;
569 dataoff = offset;
570
571 do {
572 ret = ext4_get_next_extent(inode, last, end - last + 1, &es);
573 if (ret <= 0) {
574 /* No extent found -> no data */
575 if (ret == 0)
576 ret = -ENXIO;
577 inode_unlock(inode);
578 return ret;
579 }
580
581 last = es.es_lblk;
582 if (last != start)
583 dataoff = (loff_t)last << blkbits;
584 if (!ext4_es_is_unwritten(&es))
585 break;
586
587 /*
588 * If there is a unwritten extent at this offset,
589 * it will be as a data or a hole according to page
590 * cache that has data or not.
591 */
592 if (ext4_find_unwritten_pgoff(inode, SEEK_DATA,
593 es.es_lblk + es.es_len, &dataoff))
594 break;
595 last += es.es_len;
596 dataoff = (loff_t)last << blkbits;
597 cond_resched();
598 } while (last <= end);
599
600 inode_unlock(inode);
601
602 if (dataoff > isize)
603 return -ENXIO;
604
605 return vfs_setpos(file, dataoff, maxsize);
606}
607
608/*
609 * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
610 */
611static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
612{
613 struct inode *inode = file->f_mapping->host;
614 struct extent_status es;
615 ext4_lblk_t start, last, end;
616 loff_t holeoff, isize;
617 int blkbits;
618 int ret;
619
620 inode_lock(inode);
621
622 isize = i_size_read(inode);
623 if (offset >= isize) {
624 inode_unlock(inode);
625 return -ENXIO;
626 }
627
628 blkbits = inode->i_sb->s_blocksize_bits;
629 start = offset >> blkbits;
630 last = start;
631 end = isize >> blkbits;
632 holeoff = offset;
633
634 do {
635 ret = ext4_get_next_extent(inode, last, end - last + 1, &es);
636 if (ret < 0) {
637 inode_unlock(inode);
638 return ret;
639 }
640 /* Found a hole? */
641 if (ret == 0 || es.es_lblk > last) {
642 if (last != start)
643 holeoff = (loff_t)last << blkbits;
644 break;
645 }
646 /*
647 * If there is a unwritten extent at this offset,
648 * it will be as a data or a hole according to page
649 * cache that has data or not.
650 */
651 if (ext4_es_is_unwritten(&es) &&
652 ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
653 last + es.es_len, &holeoff))
654 break;
655
656 last += es.es_len;
657 holeoff = (loff_t)last << blkbits;
658 cond_resched();
659 } while (last <= end);
660
661 inode_unlock(inode);
662
663 if (holeoff > isize)
664 holeoff = isize;
665
666 return vfs_setpos(file, holeoff, maxsize);
667}
668
669/*
670 * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
671 * by calling generic_file_llseek_size() with the appropriate maxbytes
672 * value for each.
673 */
674loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
675{
676 struct inode *inode = file->f_mapping->host;
677 loff_t maxbytes;
678
679 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
680 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
681 else
682 maxbytes = inode->i_sb->s_maxbytes;
683
684 switch (whence) {
685 case SEEK_SET:
686 case SEEK_CUR:
687 case SEEK_END:
688 return generic_file_llseek_size(file, offset, whence,
689 maxbytes, i_size_read(inode));
690 case SEEK_DATA:
691 return ext4_seek_data(file, offset, maxbytes);
692 case SEEK_HOLE:
693 return ext4_seek_hole(file, offset, maxbytes);
694 }
695
696 return -EINVAL;
697}
698
699const struct file_operations ext4_file_operations = {
700 .llseek = ext4_llseek,
701 .read_iter = generic_file_read_iter,
702 .write_iter = ext4_file_write_iter,
703 .unlocked_ioctl = ext4_ioctl,
704#ifdef CONFIG_COMPAT
705 .compat_ioctl = ext4_compat_ioctl,
706#endif
707 .mmap = ext4_file_mmap,
708 .open = ext4_file_open,
709 .release = ext4_release_file,
710 .fsync = ext4_sync_file,
711 .splice_read = generic_file_splice_read,
712 .splice_write = iter_file_splice_write,
713 .fallocate = ext4_fallocate,
714};
715
716const struct inode_operations ext4_file_inode_operations = {
717 .setattr = ext4_setattr,
718 .getattr = ext4_getattr,
719 .setxattr = generic_setxattr,
720 .getxattr = generic_getxattr,
721 .listxattr = ext4_listxattr,
722 .removexattr = generic_removexattr,
723 .get_acl = ext4_get_acl,
724 .set_acl = ext4_set_acl,
725 .fiemap = ext4_fiemap,
726};
727
1/*
2 * linux/fs/ext4/file.c
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 *
15 * ext4 fs regular file handling primitives
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>
23#include <linux/mount.h>
24#include <linux/path.h>
25#include <linux/dax.h>
26#include <linux/quotaops.h>
27#include <linux/pagevec.h>
28#include <linux/uio.h>
29#include "ext4.h"
30#include "ext4_jbd2.h"
31#include "xattr.h"
32#include "acl.h"
33
34#ifdef CONFIG_FS_DAX
35static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
36{
37 struct inode *inode = file_inode(iocb->ki_filp);
38 ssize_t ret;
39
40 inode_lock_shared(inode);
41 /*
42 * Recheck under inode lock - at this point we are sure it cannot
43 * change anymore
44 */
45 if (!IS_DAX(inode)) {
46 inode_unlock_shared(inode);
47 /* Fallback to buffered IO in case we cannot support DAX */
48 return generic_file_read_iter(iocb, to);
49 }
50 ret = dax_iomap_rw(iocb, to, &ext4_iomap_ops);
51 inode_unlock_shared(inode);
52
53 file_accessed(iocb->ki_filp);
54 return ret;
55}
56#endif
57
58static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
59{
60 if (!iov_iter_count(to))
61 return 0; /* skip atime */
62
63#ifdef CONFIG_FS_DAX
64 if (IS_DAX(file_inode(iocb->ki_filp)))
65 return ext4_dax_read_iter(iocb, to);
66#endif
67 return generic_file_read_iter(iocb, to);
68}
69
70/*
71 * Called when an inode is released. Note that this is different
72 * from ext4_file_open: open gets called at every open, but release
73 * gets called only when /all/ the files are closed.
74 */
75static int ext4_release_file(struct inode *inode, struct file *filp)
76{
77 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
78 ext4_alloc_da_blocks(inode);
79 ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
80 }
81 /* if we are the last writer on the inode, drop the block reservation */
82 if ((filp->f_mode & FMODE_WRITE) &&
83 (atomic_read(&inode->i_writecount) == 1) &&
84 !EXT4_I(inode)->i_reserved_data_blocks)
85 {
86 down_write(&EXT4_I(inode)->i_data_sem);
87 ext4_discard_preallocations(inode);
88 up_write(&EXT4_I(inode)->i_data_sem);
89 }
90 if (is_dx(inode) && filp->private_data)
91 ext4_htree_free_dir_info(filp->private_data);
92
93 return 0;
94}
95
96static void ext4_unwritten_wait(struct inode *inode)
97{
98 wait_queue_head_t *wq = ext4_ioend_wq(inode);
99
100 wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
101}
102
103/*
104 * This tests whether the IO in question is block-aligned or not.
105 * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
106 * are converted to written only after the IO is complete. Until they are
107 * mapped, these blocks appear as holes, so dio_zero_block() will assume that
108 * it needs to zero out portions of the start and/or end block. If 2 AIO
109 * threads are at work on the same unwritten block, they must be synchronized
110 * or one thread will zero the other's data, causing corruption.
111 */
112static int
113ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos)
114{
115 struct super_block *sb = inode->i_sb;
116 int blockmask = sb->s_blocksize - 1;
117
118 if (pos >= i_size_read(inode))
119 return 0;
120
121 if ((pos | iov_iter_alignment(from)) & blockmask)
122 return 1;
123
124 return 0;
125}
126
127/* Is IO overwriting allocated and initialized blocks? */
128static bool ext4_overwrite_io(struct inode *inode, loff_t pos, loff_t len)
129{
130 struct ext4_map_blocks map;
131 unsigned int blkbits = inode->i_blkbits;
132 int err, blklen;
133
134 if (pos + len > i_size_read(inode))
135 return false;
136
137 map.m_lblk = pos >> blkbits;
138 map.m_len = EXT4_MAX_BLOCKS(len, pos, blkbits);
139 blklen = map.m_len;
140
141 err = ext4_map_blocks(NULL, inode, &map, 0);
142 /*
143 * 'err==len' means that all of the blocks have been preallocated,
144 * regardless of whether they have been initialized or not. To exclude
145 * unwritten extents, we need to check m_flags.
146 */
147 return err == blklen && (map.m_flags & EXT4_MAP_MAPPED);
148}
149
150static ssize_t ext4_write_checks(struct kiocb *iocb, struct iov_iter *from)
151{
152 struct inode *inode = file_inode(iocb->ki_filp);
153 ssize_t ret;
154
155 ret = generic_write_checks(iocb, from);
156 if (ret <= 0)
157 return ret;
158 /*
159 * If we have encountered a bitmap-format file, the size limit
160 * is smaller than s_maxbytes, which is for extent-mapped files.
161 */
162 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
163 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
164
165 if (iocb->ki_pos >= sbi->s_bitmap_maxbytes)
166 return -EFBIG;
167 iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
168 }
169 return iov_iter_count(from);
170}
171
172#ifdef CONFIG_FS_DAX
173static ssize_t
174ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
175{
176 struct inode *inode = file_inode(iocb->ki_filp);
177 ssize_t ret;
178 bool overwrite = false;
179
180 inode_lock(inode);
181 ret = ext4_write_checks(iocb, from);
182 if (ret <= 0)
183 goto out;
184 ret = file_remove_privs(iocb->ki_filp);
185 if (ret)
186 goto out;
187 ret = file_update_time(iocb->ki_filp);
188 if (ret)
189 goto out;
190
191 if (ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from))) {
192 overwrite = true;
193 downgrade_write(&inode->i_rwsem);
194 }
195 ret = dax_iomap_rw(iocb, from, &ext4_iomap_ops);
196out:
197 if (!overwrite)
198 inode_unlock(inode);
199 else
200 inode_unlock_shared(inode);
201 if (ret > 0)
202 ret = generic_write_sync(iocb, ret);
203 return ret;
204}
205#endif
206
207static ssize_t
208ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
209{
210 struct inode *inode = file_inode(iocb->ki_filp);
211 int o_direct = iocb->ki_flags & IOCB_DIRECT;
212 int unaligned_aio = 0;
213 int overwrite = 0;
214 ssize_t ret;
215
216#ifdef CONFIG_FS_DAX
217 if (IS_DAX(inode))
218 return ext4_dax_write_iter(iocb, from);
219#endif
220
221 inode_lock(inode);
222 ret = ext4_write_checks(iocb, from);
223 if (ret <= 0)
224 goto out;
225
226 /*
227 * Unaligned direct AIO must be serialized among each other as zeroing
228 * of partial blocks of two competing unaligned AIOs can result in data
229 * corruption.
230 */
231 if (o_direct && ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
232 !is_sync_kiocb(iocb) &&
233 ext4_unaligned_aio(inode, from, iocb->ki_pos)) {
234 unaligned_aio = 1;
235 ext4_unwritten_wait(inode);
236 }
237
238 iocb->private = &overwrite;
239 /* Check whether we do a DIO overwrite or not */
240 if (o_direct && ext4_should_dioread_nolock(inode) && !unaligned_aio &&
241 ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from)))
242 overwrite = 1;
243
244 ret = __generic_file_write_iter(iocb, from);
245 inode_unlock(inode);
246
247 if (ret > 0)
248 ret = generic_write_sync(iocb, ret);
249
250 return ret;
251
252out:
253 inode_unlock(inode);
254 return ret;
255}
256
257#ifdef CONFIG_FS_DAX
258static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
259{
260 int result;
261 struct inode *inode = file_inode(vma->vm_file);
262 struct super_block *sb = inode->i_sb;
263 bool write = vmf->flags & FAULT_FLAG_WRITE;
264
265 if (write) {
266 sb_start_pagefault(sb);
267 file_update_time(vma->vm_file);
268 }
269 down_read(&EXT4_I(inode)->i_mmap_sem);
270 result = dax_iomap_fault(vma, vmf, &ext4_iomap_ops);
271 up_read(&EXT4_I(inode)->i_mmap_sem);
272 if (write)
273 sb_end_pagefault(sb);
274
275 return result;
276}
277
278static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
279 pmd_t *pmd, unsigned int flags)
280{
281 int result;
282 struct inode *inode = file_inode(vma->vm_file);
283 struct super_block *sb = inode->i_sb;
284 bool write = flags & FAULT_FLAG_WRITE;
285
286 if (write) {
287 sb_start_pagefault(sb);
288 file_update_time(vma->vm_file);
289 }
290 down_read(&EXT4_I(inode)->i_mmap_sem);
291 result = dax_iomap_pmd_fault(vma, addr, pmd, flags,
292 &ext4_iomap_ops);
293 up_read(&EXT4_I(inode)->i_mmap_sem);
294 if (write)
295 sb_end_pagefault(sb);
296
297 return result;
298}
299
300/*
301 * Handle write fault for VM_MIXEDMAP mappings. Similarly to ext4_dax_fault()
302 * handler we check for races agaist truncate. Note that since we cycle through
303 * i_mmap_sem, we are sure that also any hole punching that began before we
304 * were called is finished by now and so if it included part of the file we
305 * are working on, our pte will get unmapped and the check for pte_same() in
306 * wp_pfn_shared() fails. Thus fault gets retried and things work out as
307 * desired.
308 */
309static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma,
310 struct vm_fault *vmf)
311{
312 struct inode *inode = file_inode(vma->vm_file);
313 struct super_block *sb = inode->i_sb;
314 loff_t size;
315 int ret;
316
317 sb_start_pagefault(sb);
318 file_update_time(vma->vm_file);
319 down_read(&EXT4_I(inode)->i_mmap_sem);
320 size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
321 if (vmf->pgoff >= size)
322 ret = VM_FAULT_SIGBUS;
323 else
324 ret = dax_pfn_mkwrite(vma, vmf);
325 up_read(&EXT4_I(inode)->i_mmap_sem);
326 sb_end_pagefault(sb);
327
328 return ret;
329}
330
331static const struct vm_operations_struct ext4_dax_vm_ops = {
332 .fault = ext4_dax_fault,
333 .pmd_fault = ext4_dax_pmd_fault,
334 .page_mkwrite = ext4_dax_fault,
335 .pfn_mkwrite = ext4_dax_pfn_mkwrite,
336};
337#else
338#define ext4_dax_vm_ops ext4_file_vm_ops
339#endif
340
341static const struct vm_operations_struct ext4_file_vm_ops = {
342 .fault = ext4_filemap_fault,
343 .map_pages = filemap_map_pages,
344 .page_mkwrite = ext4_page_mkwrite,
345};
346
347static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
348{
349 struct inode *inode = file->f_mapping->host;
350
351 if (ext4_encrypted_inode(inode)) {
352 int err = fscrypt_get_encryption_info(inode);
353 if (err)
354 return 0;
355 if (!fscrypt_has_encryption_key(inode))
356 return -ENOKEY;
357 }
358 file_accessed(file);
359 if (IS_DAX(file_inode(file))) {
360 vma->vm_ops = &ext4_dax_vm_ops;
361 vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
362 } else {
363 vma->vm_ops = &ext4_file_vm_ops;
364 }
365 return 0;
366}
367
368static int ext4_file_open(struct inode * inode, struct file * filp)
369{
370 struct super_block *sb = inode->i_sb;
371 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
372 struct vfsmount *mnt = filp->f_path.mnt;
373 struct dentry *dir;
374 struct path path;
375 char buf[64], *cp;
376 int ret;
377
378 if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
379 !(sb->s_flags & MS_RDONLY))) {
380 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
381 /*
382 * Sample where the filesystem has been mounted and
383 * store it in the superblock for sysadmin convenience
384 * when trying to sort through large numbers of block
385 * devices or filesystem images.
386 */
387 memset(buf, 0, sizeof(buf));
388 path.mnt = mnt;
389 path.dentry = mnt->mnt_root;
390 cp = d_path(&path, buf, sizeof(buf));
391 if (!IS_ERR(cp)) {
392 handle_t *handle;
393 int err;
394
395 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
396 if (IS_ERR(handle))
397 return PTR_ERR(handle);
398 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
399 err = ext4_journal_get_write_access(handle, sbi->s_sbh);
400 if (err) {
401 ext4_journal_stop(handle);
402 return err;
403 }
404 strlcpy(sbi->s_es->s_last_mounted, cp,
405 sizeof(sbi->s_es->s_last_mounted));
406 ext4_handle_dirty_super(handle, sb);
407 ext4_journal_stop(handle);
408 }
409 }
410 if (ext4_encrypted_inode(inode)) {
411 ret = fscrypt_get_encryption_info(inode);
412 if (ret)
413 return -EACCES;
414 if (!fscrypt_has_encryption_key(inode))
415 return -ENOKEY;
416 }
417
418 dir = dget_parent(file_dentry(filp));
419 if (ext4_encrypted_inode(d_inode(dir)) &&
420 !fscrypt_has_permitted_context(d_inode(dir), inode)) {
421 ext4_warning(inode->i_sb,
422 "Inconsistent encryption contexts: %lu/%lu",
423 (unsigned long) d_inode(dir)->i_ino,
424 (unsigned long) inode->i_ino);
425 dput(dir);
426 return -EPERM;
427 }
428 dput(dir);
429 /*
430 * Set up the jbd2_inode if we are opening the inode for
431 * writing and the journal is present
432 */
433 if (filp->f_mode & FMODE_WRITE) {
434 ret = ext4_inode_attach_jinode(inode);
435 if (ret < 0)
436 return ret;
437 }
438 return dquot_file_open(inode, filp);
439}
440
441/*
442 * Here we use ext4_map_blocks() to get a block mapping for a extent-based
443 * file rather than ext4_ext_walk_space() because we can introduce
444 * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
445 * function. When extent status tree has been fully implemented, it will
446 * track all extent status for a file and we can directly use it to
447 * retrieve the offset for SEEK_DATA/SEEK_HOLE.
448 */
449
450/*
451 * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
452 * lookup page cache to check whether or not there has some data between
453 * [startoff, endoff] because, if this range contains an unwritten extent,
454 * we determine this extent as a data or a hole according to whether the
455 * page cache has data or not.
456 */
457static int ext4_find_unwritten_pgoff(struct inode *inode,
458 int whence,
459 ext4_lblk_t end_blk,
460 loff_t *offset)
461{
462 struct pagevec pvec;
463 unsigned int blkbits;
464 pgoff_t index;
465 pgoff_t end;
466 loff_t endoff;
467 loff_t startoff;
468 loff_t lastoff;
469 int found = 0;
470
471 blkbits = inode->i_sb->s_blocksize_bits;
472 startoff = *offset;
473 lastoff = startoff;
474 endoff = (loff_t)end_blk << blkbits;
475
476 index = startoff >> PAGE_SHIFT;
477 end = endoff >> PAGE_SHIFT;
478
479 pagevec_init(&pvec, 0);
480 do {
481 int i, num;
482 unsigned long nr_pages;
483
484 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
485 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
486 (pgoff_t)num);
487 if (nr_pages == 0) {
488 if (whence == SEEK_DATA)
489 break;
490
491 BUG_ON(whence != SEEK_HOLE);
492 /*
493 * If this is the first time to go into the loop and
494 * offset is not beyond the end offset, it will be a
495 * hole at this offset
496 */
497 if (lastoff == startoff || lastoff < endoff)
498 found = 1;
499 break;
500 }
501
502 /*
503 * If this is the first time to go into the loop and
504 * offset is smaller than the first page offset, it will be a
505 * hole at this offset.
506 */
507 if (lastoff == startoff && whence == SEEK_HOLE &&
508 lastoff < page_offset(pvec.pages[0])) {
509 found = 1;
510 break;
511 }
512
513 for (i = 0; i < nr_pages; i++) {
514 struct page *page = pvec.pages[i];
515 struct buffer_head *bh, *head;
516
517 /*
518 * If the current offset is not beyond the end of given
519 * range, it will be a hole.
520 */
521 if (lastoff < endoff && whence == SEEK_HOLE &&
522 page->index > end) {
523 found = 1;
524 *offset = lastoff;
525 goto out;
526 }
527
528 lock_page(page);
529
530 if (unlikely(page->mapping != inode->i_mapping)) {
531 unlock_page(page);
532 continue;
533 }
534
535 if (!page_has_buffers(page)) {
536 unlock_page(page);
537 continue;
538 }
539
540 if (page_has_buffers(page)) {
541 lastoff = page_offset(page);
542 bh = head = page_buffers(page);
543 do {
544 if (buffer_uptodate(bh) ||
545 buffer_unwritten(bh)) {
546 if (whence == SEEK_DATA)
547 found = 1;
548 } else {
549 if (whence == SEEK_HOLE)
550 found = 1;
551 }
552 if (found) {
553 *offset = max_t(loff_t,
554 startoff, lastoff);
555 unlock_page(page);
556 goto out;
557 }
558 lastoff += bh->b_size;
559 bh = bh->b_this_page;
560 } while (bh != head);
561 }
562
563 lastoff = page_offset(page) + PAGE_SIZE;
564 unlock_page(page);
565 }
566
567 /*
568 * The no. of pages is less than our desired, that would be a
569 * hole in there.
570 */
571 if (nr_pages < num && whence == SEEK_HOLE) {
572 found = 1;
573 *offset = lastoff;
574 break;
575 }
576
577 index = pvec.pages[i - 1]->index + 1;
578 pagevec_release(&pvec);
579 } while (index <= end);
580
581out:
582 pagevec_release(&pvec);
583 return found;
584}
585
586/*
587 * ext4_seek_data() retrieves the offset for SEEK_DATA.
588 */
589static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
590{
591 struct inode *inode = file->f_mapping->host;
592 struct extent_status es;
593 ext4_lblk_t start, last, end;
594 loff_t dataoff, isize;
595 int blkbits;
596 int ret;
597
598 inode_lock(inode);
599
600 isize = i_size_read(inode);
601 if (offset >= isize) {
602 inode_unlock(inode);
603 return -ENXIO;
604 }
605
606 blkbits = inode->i_sb->s_blocksize_bits;
607 start = offset >> blkbits;
608 last = start;
609 end = isize >> blkbits;
610 dataoff = offset;
611
612 do {
613 ret = ext4_get_next_extent(inode, last, end - last + 1, &es);
614 if (ret <= 0) {
615 /* No extent found -> no data */
616 if (ret == 0)
617 ret = -ENXIO;
618 inode_unlock(inode);
619 return ret;
620 }
621
622 last = es.es_lblk;
623 if (last != start)
624 dataoff = (loff_t)last << blkbits;
625 if (!ext4_es_is_unwritten(&es))
626 break;
627
628 /*
629 * If there is a unwritten extent at this offset,
630 * it will be as a data or a hole according to page
631 * cache that has data or not.
632 */
633 if (ext4_find_unwritten_pgoff(inode, SEEK_DATA,
634 es.es_lblk + es.es_len, &dataoff))
635 break;
636 last += es.es_len;
637 dataoff = (loff_t)last << blkbits;
638 cond_resched();
639 } while (last <= end);
640
641 inode_unlock(inode);
642
643 if (dataoff > isize)
644 return -ENXIO;
645
646 return vfs_setpos(file, dataoff, maxsize);
647}
648
649/*
650 * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
651 */
652static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
653{
654 struct inode *inode = file->f_mapping->host;
655 struct extent_status es;
656 ext4_lblk_t start, last, end;
657 loff_t holeoff, isize;
658 int blkbits;
659 int ret;
660
661 inode_lock(inode);
662
663 isize = i_size_read(inode);
664 if (offset >= isize) {
665 inode_unlock(inode);
666 return -ENXIO;
667 }
668
669 blkbits = inode->i_sb->s_blocksize_bits;
670 start = offset >> blkbits;
671 last = start;
672 end = isize >> blkbits;
673 holeoff = offset;
674
675 do {
676 ret = ext4_get_next_extent(inode, last, end - last + 1, &es);
677 if (ret < 0) {
678 inode_unlock(inode);
679 return ret;
680 }
681 /* Found a hole? */
682 if (ret == 0 || es.es_lblk > last) {
683 if (last != start)
684 holeoff = (loff_t)last << blkbits;
685 break;
686 }
687 /*
688 * If there is a unwritten extent at this offset,
689 * it will be as a data or a hole according to page
690 * cache that has data or not.
691 */
692 if (ext4_es_is_unwritten(&es) &&
693 ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
694 last + es.es_len, &holeoff))
695 break;
696
697 last += es.es_len;
698 holeoff = (loff_t)last << blkbits;
699 cond_resched();
700 } while (last <= end);
701
702 inode_unlock(inode);
703
704 if (holeoff > isize)
705 holeoff = isize;
706
707 return vfs_setpos(file, holeoff, maxsize);
708}
709
710/*
711 * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
712 * by calling generic_file_llseek_size() with the appropriate maxbytes
713 * value for each.
714 */
715loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
716{
717 struct inode *inode = file->f_mapping->host;
718 loff_t maxbytes;
719
720 if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
721 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
722 else
723 maxbytes = inode->i_sb->s_maxbytes;
724
725 switch (whence) {
726 case SEEK_SET:
727 case SEEK_CUR:
728 case SEEK_END:
729 return generic_file_llseek_size(file, offset, whence,
730 maxbytes, i_size_read(inode));
731 case SEEK_DATA:
732 return ext4_seek_data(file, offset, maxbytes);
733 case SEEK_HOLE:
734 return ext4_seek_hole(file, offset, maxbytes);
735 }
736
737 return -EINVAL;
738}
739
740const struct file_operations ext4_file_operations = {
741 .llseek = ext4_llseek,
742 .read_iter = ext4_file_read_iter,
743 .write_iter = ext4_file_write_iter,
744 .unlocked_ioctl = ext4_ioctl,
745#ifdef CONFIG_COMPAT
746 .compat_ioctl = ext4_compat_ioctl,
747#endif
748 .mmap = ext4_file_mmap,
749 .open = ext4_file_open,
750 .release = ext4_release_file,
751 .fsync = ext4_sync_file,
752 .get_unmapped_area = thp_get_unmapped_area,
753 .splice_read = generic_file_splice_read,
754 .splice_write = iter_file_splice_write,
755 .fallocate = ext4_fallocate,
756};
757
758const struct inode_operations ext4_file_inode_operations = {
759 .setattr = ext4_setattr,
760 .getattr = ext4_getattr,
761 .listxattr = ext4_listxattr,
762 .get_acl = ext4_get_acl,
763 .set_acl = ext4_set_acl,
764 .fiemap = ext4_fiemap,
765};
766