mm: make pagevec_lookup() update index
[sfrench/cifs-2.6.git] / fs / ext4 / file.c
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
35 static 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         if (!inode_trylock_shared(inode)) {
41                 if (iocb->ki_flags & IOCB_NOWAIT)
42                         return -EAGAIN;
43                 inode_lock_shared(inode);
44         }
45         /*
46          * Recheck under inode lock - at this point we are sure it cannot
47          * change anymore
48          */
49         if (!IS_DAX(inode)) {
50                 inode_unlock_shared(inode);
51                 /* Fallback to buffered IO in case we cannot support DAX */
52                 return generic_file_read_iter(iocb, to);
53         }
54         ret = dax_iomap_rw(iocb, to, &ext4_iomap_ops);
55         inode_unlock_shared(inode);
56
57         file_accessed(iocb->ki_filp);
58         return ret;
59 }
60 #endif
61
62 static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
63 {
64         if (unlikely(ext4_forced_shutdown(EXT4_SB(file_inode(iocb->ki_filp)->i_sb))))
65                 return -EIO;
66
67         if (!iov_iter_count(to))
68                 return 0; /* skip atime */
69
70 #ifdef CONFIG_FS_DAX
71         if (IS_DAX(file_inode(iocb->ki_filp)))
72                 return ext4_dax_read_iter(iocb, to);
73 #endif
74         return generic_file_read_iter(iocb, to);
75 }
76
77 /*
78  * Called when an inode is released. Note that this is different
79  * from ext4_file_open: open gets called at every open, but release
80  * gets called only when /all/ the files are closed.
81  */
82 static int ext4_release_file(struct inode *inode, struct file *filp)
83 {
84         if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
85                 ext4_alloc_da_blocks(inode);
86                 ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
87         }
88         /* if we are the last writer on the inode, drop the block reservation */
89         if ((filp->f_mode & FMODE_WRITE) &&
90                         (atomic_read(&inode->i_writecount) == 1) &&
91                         !EXT4_I(inode)->i_reserved_data_blocks)
92         {
93                 down_write(&EXT4_I(inode)->i_data_sem);
94                 ext4_discard_preallocations(inode);
95                 up_write(&EXT4_I(inode)->i_data_sem);
96         }
97         if (is_dx(inode) && filp->private_data)
98                 ext4_htree_free_dir_info(filp->private_data);
99
100         return 0;
101 }
102
103 static void ext4_unwritten_wait(struct inode *inode)
104 {
105         wait_queue_head_t *wq = ext4_ioend_wq(inode);
106
107         wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
108 }
109
110 /*
111  * This tests whether the IO in question is block-aligned or not.
112  * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
113  * are converted to written only after the IO is complete.  Until they are
114  * mapped, these blocks appear as holes, so dio_zero_block() will assume that
115  * it needs to zero out portions of the start and/or end block.  If 2 AIO
116  * threads are at work on the same unwritten block, they must be synchronized
117  * or one thread will zero the other's data, causing corruption.
118  */
119 static int
120 ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos)
121 {
122         struct super_block *sb = inode->i_sb;
123         int blockmask = sb->s_blocksize - 1;
124
125         if (pos >= i_size_read(inode))
126                 return 0;
127
128         if ((pos | iov_iter_alignment(from)) & blockmask)
129                 return 1;
130
131         return 0;
132 }
133
134 /* Is IO overwriting allocated and initialized blocks? */
135 static bool ext4_overwrite_io(struct inode *inode, loff_t pos, loff_t len)
136 {
137         struct ext4_map_blocks map;
138         unsigned int blkbits = inode->i_blkbits;
139         int err, blklen;
140
141         if (pos + len > i_size_read(inode))
142                 return false;
143
144         map.m_lblk = pos >> blkbits;
145         map.m_len = EXT4_MAX_BLOCKS(len, pos, blkbits);
146         blklen = map.m_len;
147
148         err = ext4_map_blocks(NULL, inode, &map, 0);
149         /*
150          * 'err==len' means that all of the blocks have been preallocated,
151          * regardless of whether they have been initialized or not. To exclude
152          * unwritten extents, we need to check m_flags.
153          */
154         return err == blklen && (map.m_flags & EXT4_MAP_MAPPED);
155 }
156
157 static ssize_t ext4_write_checks(struct kiocb *iocb, struct iov_iter *from)
158 {
159         struct inode *inode = file_inode(iocb->ki_filp);
160         ssize_t ret;
161
162         ret = generic_write_checks(iocb, from);
163         if (ret <= 0)
164                 return ret;
165         /*
166          * If we have encountered a bitmap-format file, the size limit
167          * is smaller than s_maxbytes, which is for extent-mapped files.
168          */
169         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
170                 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
171
172                 if (iocb->ki_pos >= sbi->s_bitmap_maxbytes)
173                         return -EFBIG;
174                 iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
175         }
176         return iov_iter_count(from);
177 }
178
179 #ifdef CONFIG_FS_DAX
180 static ssize_t
181 ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
182 {
183         struct inode *inode = file_inode(iocb->ki_filp);
184         ssize_t ret;
185
186         if (!inode_trylock(inode)) {
187                 if (iocb->ki_flags & IOCB_NOWAIT)
188                         return -EAGAIN;
189                 inode_lock(inode);
190         }
191         ret = ext4_write_checks(iocb, from);
192         if (ret <= 0)
193                 goto out;
194         ret = file_remove_privs(iocb->ki_filp);
195         if (ret)
196                 goto out;
197         ret = file_update_time(iocb->ki_filp);
198         if (ret)
199                 goto out;
200
201         ret = dax_iomap_rw(iocb, from, &ext4_iomap_ops);
202 out:
203         inode_unlock(inode);
204         if (ret > 0)
205                 ret = generic_write_sync(iocb, ret);
206         return ret;
207 }
208 #endif
209
210 static ssize_t
211 ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
212 {
213         struct inode *inode = file_inode(iocb->ki_filp);
214         int o_direct = iocb->ki_flags & IOCB_DIRECT;
215         int unaligned_aio = 0;
216         int overwrite = 0;
217         ssize_t ret;
218
219         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
220                 return -EIO;
221
222 #ifdef CONFIG_FS_DAX
223         if (IS_DAX(inode))
224                 return ext4_dax_write_iter(iocb, from);
225 #endif
226
227         if (!inode_trylock(inode)) {
228                 if (iocb->ki_flags & IOCB_NOWAIT)
229                         return -EAGAIN;
230                 inode_lock(inode);
231         }
232
233         ret = ext4_write_checks(iocb, from);
234         if (ret <= 0)
235                 goto out;
236
237         /*
238          * Unaligned direct AIO must be serialized among each other as zeroing
239          * of partial blocks of two competing unaligned AIOs can result in data
240          * corruption.
241          */
242         if (o_direct && ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
243             !is_sync_kiocb(iocb) &&
244             ext4_unaligned_aio(inode, from, iocb->ki_pos)) {
245                 unaligned_aio = 1;
246                 ext4_unwritten_wait(inode);
247         }
248
249         iocb->private = &overwrite;
250         /* Check whether we do a DIO overwrite or not */
251         if (o_direct && !unaligned_aio) {
252                 if (ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from))) {
253                         if (ext4_should_dioread_nolock(inode))
254                                 overwrite = 1;
255                 } else if (iocb->ki_flags & IOCB_NOWAIT) {
256                         ret = -EAGAIN;
257                         goto out;
258                 }
259         }
260
261         ret = __generic_file_write_iter(iocb, from);
262         inode_unlock(inode);
263
264         if (ret > 0)
265                 ret = generic_write_sync(iocb, ret);
266
267         return ret;
268
269 out:
270         inode_unlock(inode);
271         return ret;
272 }
273
274 #ifdef CONFIG_FS_DAX
275 static int ext4_dax_huge_fault(struct vm_fault *vmf,
276                 enum page_entry_size pe_size)
277 {
278         int result;
279         handle_t *handle = NULL;
280         struct inode *inode = file_inode(vmf->vma->vm_file);
281         struct super_block *sb = inode->i_sb;
282         bool write = vmf->flags & FAULT_FLAG_WRITE;
283
284         if (write) {
285                 sb_start_pagefault(sb);
286                 file_update_time(vmf->vma->vm_file);
287                 down_read(&EXT4_I(inode)->i_mmap_sem);
288                 handle = ext4_journal_start_sb(sb, EXT4_HT_WRITE_PAGE,
289                                                EXT4_DATA_TRANS_BLOCKS(sb));
290         } else {
291                 down_read(&EXT4_I(inode)->i_mmap_sem);
292         }
293         if (!IS_ERR(handle))
294                 result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
295         else
296                 result = VM_FAULT_SIGBUS;
297         if (write) {
298                 if (!IS_ERR(handle))
299                         ext4_journal_stop(handle);
300                 up_read(&EXT4_I(inode)->i_mmap_sem);
301                 sb_end_pagefault(sb);
302         } else {
303                 up_read(&EXT4_I(inode)->i_mmap_sem);
304         }
305
306         return result;
307 }
308
309 static int ext4_dax_fault(struct vm_fault *vmf)
310 {
311         return ext4_dax_huge_fault(vmf, PE_SIZE_PTE);
312 }
313
314 static const struct vm_operations_struct ext4_dax_vm_ops = {
315         .fault          = ext4_dax_fault,
316         .huge_fault     = ext4_dax_huge_fault,
317         .page_mkwrite   = ext4_dax_fault,
318         .pfn_mkwrite    = ext4_dax_fault,
319 };
320 #else
321 #define ext4_dax_vm_ops ext4_file_vm_ops
322 #endif
323
324 static const struct vm_operations_struct ext4_file_vm_ops = {
325         .fault          = ext4_filemap_fault,
326         .map_pages      = filemap_map_pages,
327         .page_mkwrite   = ext4_page_mkwrite,
328 };
329
330 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
331 {
332         struct inode *inode = file->f_mapping->host;
333
334         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
335                 return -EIO;
336
337         file_accessed(file);
338         if (IS_DAX(file_inode(file))) {
339                 vma->vm_ops = &ext4_dax_vm_ops;
340                 vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
341         } else {
342                 vma->vm_ops = &ext4_file_vm_ops;
343         }
344         return 0;
345 }
346
347 static int ext4_file_open(struct inode * inode, struct file * filp)
348 {
349         struct super_block *sb = inode->i_sb;
350         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
351         struct vfsmount *mnt = filp->f_path.mnt;
352         struct dentry *dir;
353         struct path path;
354         char buf[64], *cp;
355         int ret;
356
357         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
358                 return -EIO;
359
360         if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
361                      !(sb->s_flags & MS_RDONLY))) {
362                 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
363                 /*
364                  * Sample where the filesystem has been mounted and
365                  * store it in the superblock for sysadmin convenience
366                  * when trying to sort through large numbers of block
367                  * devices or filesystem images.
368                  */
369                 memset(buf, 0, sizeof(buf));
370                 path.mnt = mnt;
371                 path.dentry = mnt->mnt_root;
372                 cp = d_path(&path, buf, sizeof(buf));
373                 if (!IS_ERR(cp)) {
374                         handle_t *handle;
375                         int err;
376
377                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
378                         if (IS_ERR(handle))
379                                 return PTR_ERR(handle);
380                         BUFFER_TRACE(sbi->s_sbh, "get_write_access");
381                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
382                         if (err) {
383                                 ext4_journal_stop(handle);
384                                 return err;
385                         }
386                         strlcpy(sbi->s_es->s_last_mounted, cp,
387                                 sizeof(sbi->s_es->s_last_mounted));
388                         ext4_handle_dirty_super(handle, sb);
389                         ext4_journal_stop(handle);
390                 }
391         }
392         if (ext4_encrypted_inode(inode)) {
393                 ret = fscrypt_get_encryption_info(inode);
394                 if (ret)
395                         return -EACCES;
396                 if (!fscrypt_has_encryption_key(inode))
397                         return -ENOKEY;
398         }
399
400         dir = dget_parent(file_dentry(filp));
401         if (ext4_encrypted_inode(d_inode(dir)) &&
402                         !fscrypt_has_permitted_context(d_inode(dir), inode)) {
403                 ext4_warning(inode->i_sb,
404                              "Inconsistent encryption contexts: %lu/%lu",
405                              (unsigned long) d_inode(dir)->i_ino,
406                              (unsigned long) inode->i_ino);
407                 dput(dir);
408                 return -EPERM;
409         }
410         dput(dir);
411         /*
412          * Set up the jbd2_inode if we are opening the inode for
413          * writing and the journal is present
414          */
415         if (filp->f_mode & FMODE_WRITE) {
416                 ret = ext4_inode_attach_jinode(inode);
417                 if (ret < 0)
418                         return ret;
419         }
420
421         /* Set the flags to support nowait AIO */
422         filp->f_mode |= FMODE_AIO_NOWAIT;
423
424         return dquot_file_open(inode, filp);
425 }
426
427 /*
428  * Here we use ext4_map_blocks() to get a block mapping for a extent-based
429  * file rather than ext4_ext_walk_space() because we can introduce
430  * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
431  * function.  When extent status tree has been fully implemented, it will
432  * track all extent status for a file and we can directly use it to
433  * retrieve the offset for SEEK_DATA/SEEK_HOLE.
434  */
435
436 /*
437  * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
438  * lookup page cache to check whether or not there has some data between
439  * [startoff, endoff] because, if this range contains an unwritten extent,
440  * we determine this extent as a data or a hole according to whether the
441  * page cache has data or not.
442  */
443 static int ext4_find_unwritten_pgoff(struct inode *inode,
444                                      int whence,
445                                      ext4_lblk_t end_blk,
446                                      loff_t *offset)
447 {
448         struct pagevec pvec;
449         unsigned int blkbits;
450         pgoff_t index;
451         pgoff_t end;
452         loff_t endoff;
453         loff_t startoff;
454         loff_t lastoff;
455         int found = 0;
456
457         blkbits = inode->i_sb->s_blocksize_bits;
458         startoff = *offset;
459         lastoff = startoff;
460         endoff = (loff_t)end_blk << blkbits;
461
462         index = startoff >> PAGE_SHIFT;
463         end = (endoff - 1) >> PAGE_SHIFT;
464
465         pagevec_init(&pvec, 0);
466         do {
467                 int i, num;
468                 unsigned long nr_pages;
469
470                 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE - 1) + 1;
471                 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, &index,
472                                           (pgoff_t)num);
473                 if (nr_pages == 0)
474                         break;
475
476                 for (i = 0; i < nr_pages; i++) {
477                         struct page *page = pvec.pages[i];
478                         struct buffer_head *bh, *head;
479
480                         /*
481                          * If current offset is smaller than the page offset,
482                          * there is a hole at this offset.
483                          */
484                         if (whence == SEEK_HOLE && lastoff < endoff &&
485                             lastoff < page_offset(pvec.pages[i])) {
486                                 found = 1;
487                                 *offset = lastoff;
488                                 goto out;
489                         }
490
491                         if (page->index > end)
492                                 goto out;
493
494                         lock_page(page);
495
496                         if (unlikely(page->mapping != inode->i_mapping)) {
497                                 unlock_page(page);
498                                 continue;
499                         }
500
501                         if (!page_has_buffers(page)) {
502                                 unlock_page(page);
503                                 continue;
504                         }
505
506                         if (page_has_buffers(page)) {
507                                 lastoff = page_offset(page);
508                                 bh = head = page_buffers(page);
509                                 do {
510                                         if (lastoff + bh->b_size <= startoff)
511                                                 goto next;
512                                         if (buffer_uptodate(bh) ||
513                                             buffer_unwritten(bh)) {
514                                                 if (whence == SEEK_DATA)
515                                                         found = 1;
516                                         } else {
517                                                 if (whence == SEEK_HOLE)
518                                                         found = 1;
519                                         }
520                                         if (found) {
521                                                 *offset = max_t(loff_t,
522                                                         startoff, lastoff);
523                                                 unlock_page(page);
524                                                 goto out;
525                                         }
526 next:
527                                         lastoff += bh->b_size;
528                                         bh = bh->b_this_page;
529                                 } while (bh != head);
530                         }
531
532                         lastoff = page_offset(page) + PAGE_SIZE;
533                         unlock_page(page);
534                 }
535
536                 /* The no. of pages is less than our desired, we are done. */
537                 if (nr_pages < num)
538                         break;
539                 pagevec_release(&pvec);
540         } while (index <= end);
541
542         if (whence == SEEK_HOLE && lastoff < endoff) {
543                 found = 1;
544                 *offset = lastoff;
545         }
546 out:
547         pagevec_release(&pvec);
548         return found;
549 }
550
551 /*
552  * ext4_seek_data() retrieves the offset for SEEK_DATA.
553  */
554 static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
555 {
556         struct inode *inode = file->f_mapping->host;
557         struct extent_status es;
558         ext4_lblk_t start, last, end;
559         loff_t dataoff, isize;
560         int blkbits;
561         int ret;
562
563         inode_lock(inode);
564
565         isize = i_size_read(inode);
566         if (offset >= isize) {
567                 inode_unlock(inode);
568                 return -ENXIO;
569         }
570
571         blkbits = inode->i_sb->s_blocksize_bits;
572         start = offset >> blkbits;
573         last = start;
574         end = isize >> blkbits;
575         dataoff = offset;
576
577         do {
578                 ret = ext4_get_next_extent(inode, last, end - last + 1, &es);
579                 if (ret <= 0) {
580                         /* No extent found -> no data */
581                         if (ret == 0)
582                                 ret = -ENXIO;
583                         inode_unlock(inode);
584                         return ret;
585                 }
586
587                 last = es.es_lblk;
588                 if (last != start)
589                         dataoff = (loff_t)last << blkbits;
590                 if (!ext4_es_is_unwritten(&es))
591                         break;
592
593                 /*
594                  * If there is a unwritten extent at this offset,
595                  * it will be as a data or a hole according to page
596                  * cache that has data or not.
597                  */
598                 if (ext4_find_unwritten_pgoff(inode, SEEK_DATA,
599                                               es.es_lblk + es.es_len, &dataoff))
600                         break;
601                 last += es.es_len;
602                 dataoff = (loff_t)last << blkbits;
603                 cond_resched();
604         } while (last <= end);
605
606         inode_unlock(inode);
607
608         if (dataoff > isize)
609                 return -ENXIO;
610
611         return vfs_setpos(file, dataoff, maxsize);
612 }
613
614 /*
615  * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
616  */
617 static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
618 {
619         struct inode *inode = file->f_mapping->host;
620         struct extent_status es;
621         ext4_lblk_t start, last, end;
622         loff_t holeoff, isize;
623         int blkbits;
624         int ret;
625
626         inode_lock(inode);
627
628         isize = i_size_read(inode);
629         if (offset >= isize) {
630                 inode_unlock(inode);
631                 return -ENXIO;
632         }
633
634         blkbits = inode->i_sb->s_blocksize_bits;
635         start = offset >> blkbits;
636         last = start;
637         end = isize >> blkbits;
638         holeoff = offset;
639
640         do {
641                 ret = ext4_get_next_extent(inode, last, end - last + 1, &es);
642                 if (ret < 0) {
643                         inode_unlock(inode);
644                         return ret;
645                 }
646                 /* Found a hole? */
647                 if (ret == 0 || es.es_lblk > last) {
648                         if (last != start)
649                                 holeoff = (loff_t)last << blkbits;
650                         break;
651                 }
652                 /*
653                  * If there is a unwritten extent at this offset,
654                  * it will be as a data or a hole according to page
655                  * cache that has data or not.
656                  */
657                 if (ext4_es_is_unwritten(&es) &&
658                     ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
659                                               last + es.es_len, &holeoff))
660                         break;
661
662                 last += es.es_len;
663                 holeoff = (loff_t)last << blkbits;
664                 cond_resched();
665         } while (last <= end);
666
667         inode_unlock(inode);
668
669         if (holeoff > isize)
670                 holeoff = isize;
671
672         return vfs_setpos(file, holeoff, maxsize);
673 }
674
675 /*
676  * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
677  * by calling generic_file_llseek_size() with the appropriate maxbytes
678  * value for each.
679  */
680 loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
681 {
682         struct inode *inode = file->f_mapping->host;
683         loff_t maxbytes;
684
685         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
686                 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
687         else
688                 maxbytes = inode->i_sb->s_maxbytes;
689
690         switch (whence) {
691         case SEEK_SET:
692         case SEEK_CUR:
693         case SEEK_END:
694                 return generic_file_llseek_size(file, offset, whence,
695                                                 maxbytes, i_size_read(inode));
696         case SEEK_DATA:
697                 return ext4_seek_data(file, offset, maxbytes);
698         case SEEK_HOLE:
699                 return ext4_seek_hole(file, offset, maxbytes);
700         }
701
702         return -EINVAL;
703 }
704
705 const struct file_operations ext4_file_operations = {
706         .llseek         = ext4_llseek,
707         .read_iter      = ext4_file_read_iter,
708         .write_iter     = ext4_file_write_iter,
709         .unlocked_ioctl = ext4_ioctl,
710 #ifdef CONFIG_COMPAT
711         .compat_ioctl   = ext4_compat_ioctl,
712 #endif
713         .mmap           = ext4_file_mmap,
714         .open           = ext4_file_open,
715         .release        = ext4_release_file,
716         .fsync          = ext4_sync_file,
717         .get_unmapped_area = thp_get_unmapped_area,
718         .splice_read    = generic_file_splice_read,
719         .splice_write   = iter_file_splice_write,
720         .fallocate      = ext4_fallocate,
721 };
722
723 const struct inode_operations ext4_file_inode_operations = {
724         .setattr        = ext4_setattr,
725         .getattr        = ext4_file_getattr,
726         .listxattr      = ext4_listxattr,
727         .get_acl        = ext4_get_acl,
728         .set_acl        = ext4_set_acl,
729         .fiemap         = ext4_fiemap,
730 };
731