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 /*
  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  */
  39 static 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
  60 static 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  */
  76 static int
  77 ext4_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
  91 static ssize_t
  92 ext4_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 mutex *aio_mutex = NULL;
  97         struct blk_plug plug;
  98         int o_direct = iocb->ki_flags & IOCB_DIRECT;
  99         int overwrite = 0;
 100         ssize_t ret;
 101
 102         /*
 103          * Unaligned direct AIO must be serialized; see comment above
 104          * In the case of O_APPEND, assume that we must always serialize
 105          */
 106         if (o_direct &&
 107             ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
 108             !is_sync_kiocb(iocb) &&
 109             (iocb->ki_flags & IOCB_APPEND ||
 110              ext4_unaligned_aio(inode, from, iocb->ki_pos))) {
 111                 aio_mutex = ext4_aio_mutex(inode);
 112                 mutex_lock(aio_mutex);
 113                 ext4_unwritten_wait(inode);
 114         }
 115
 116         mutex_lock(&inode->i_mutex);
 117         ret = generic_write_checks(iocb, from);
 118         if (ret <= 0)
 119                 goto out;
 120
 121         /*
 122          * If we have encountered a bitmap-format file, the size limit
 123          * is smaller than s_maxbytes, which is for extent-mapped files.
 124          */
 125         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
 126                 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 127
 128                 if (iocb->ki_pos >= sbi->s_bitmap_maxbytes) {
 129                         ret = -EFBIG;
 130                         goto out;
 131                 }
 132                 iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
 133         }
 134
 135         iocb->private = &overwrite;
 136         if (o_direct) {
 137                 size_t length = iov_iter_count(from);
 138                 loff_t pos = iocb->ki_pos;
 139                 blk_start_plug(&plug);
 140
 141                 /* check whether we do a DIO overwrite or not */
 142                 if (ext4_should_dioread_nolock(inode) && !aio_mutex &&
 143                     !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
 144                         struct ext4_map_blocks map;
 145                         unsigned int blkbits = inode->i_blkbits;
 146                         int err, len;
 147
 148                         map.m_lblk = pos >> blkbits;
 149                         map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
 150                                 - map.m_lblk;
 151                         len = map.m_len;
 152
 153                         err = ext4_map_blocks(NULL, inode, &map, 0);
 154                         /*
 155                          * 'err==len' means that all of blocks has
 156                          * been preallocated no matter they are
 157                          * initialized or not.  For excluding
 158                          * unwritten extents, we need to check
 159                          * m_flags.  There are two conditions that
 160                          * indicate for initialized extents.  1) If we
 161                          * hit extent cache, EXT4_MAP_MAPPED flag is
 162                          * returned; 2) If we do a real lookup,
 163                          * non-flags are returned.  So we should check
 164                          * these two conditions.
 165                          */
 166                         if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
 167                                 overwrite = 1;
 168                 }
 169         }
 170
 171         ret = __generic_file_write_iter(iocb, from);
 172         mutex_unlock(&inode->i_mutex);
 173
 174         if (ret > 0) {
 175                 ssize_t err;
 176
 177                 err = generic_write_sync(file, iocb->ki_pos - ret, ret);
 178                 if (err < 0)
 179                         ret = err;
 180         }
 181         if (o_direct)
 182                 blk_finish_plug(&plug);
 183
 184         if (aio_mutex)
 185                 mutex_unlock(aio_mutex);
 186         return ret;
 187
 188 out:
 189         mutex_unlock(&inode->i_mutex);
 190         if (aio_mutex)
 191                 mutex_unlock(aio_mutex);
 192         return ret;
 193 }
 194
 195 #ifdef CONFIG_FS_DAX
 196 static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate)
 197 {
 198         struct inode *inode = bh->b_assoc_map->host;
 199         /* XXX: breaks on 32-bit > 16TB. Is that even supported? */
 200         loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits;
 201         int err;
 202         if (!uptodate)
 203                 return;
 204         WARN_ON(!buffer_unwritten(bh));
 205         err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size);
 206 }
 207
 208 static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 209 {
 210         return dax_fault(vma, vmf, ext4_get_block_write, ext4_end_io_unwritten);
 211 }
 212
 213 static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
 214                                                 pmd_t *pmd, unsigned int flags)
 215 {
 216         return dax_pmd_fault(vma, addr, pmd, flags, ext4_get_block_write,
 217                                 ext4_end_io_unwritten);
 218 }
 219
 220 static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 221 {
 222         return dax_mkwrite(vma, vmf, ext4_get_block_write,
 223                                 ext4_end_io_unwritten);
 224 }
 225
 226 static const struct vm_operations_struct ext4_dax_vm_ops = {
 227         .fault          = ext4_dax_fault,
 228         .pmd_fault      = ext4_dax_pmd_fault,
 229         .page_mkwrite   = ext4_dax_mkwrite,
 230         .pfn_mkwrite    = dax_pfn_mkwrite,
 231 };
 232 #else
 233 #define ext4_dax_vm_ops ext4_file_vm_ops
 234 #endif
 235
 236 static const struct vm_operations_struct ext4_file_vm_ops = {
 237         .fault          = filemap_fault,
 238         .map_pages      = filemap_map_pages,
 239         .page_mkwrite   = ext4_page_mkwrite,
 240 };
 241
 242 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
 243 {
 244         struct inode *inode = file->f_mapping->host;
 245
 246         if (ext4_encrypted_inode(inode)) {
 247                 int err = ext4_get_encryption_info(inode);
 248                 if (err)
 249                         return 0;
 250                 if (ext4_encryption_info(inode) == NULL)
 251                         return -ENOKEY;
 252         }
 253         file_accessed(file);
 254         if (IS_DAX(file_inode(file))) {
 255                 vma->vm_ops = &ext4_dax_vm_ops;
 256                 vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
 257         } else {
 258                 vma->vm_ops = &ext4_file_vm_ops;
 259         }
 260         return 0;
 261 }
 262
 263 static int ext4_file_open(struct inode * inode, struct file * filp)
 264 {
 265         struct super_block *sb = inode->i_sb;
 266         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 267         struct vfsmount *mnt = filp->f_path.mnt;
 268         struct path path;
 269         char buf[64], *cp;
 270         int ret;
 271
 272         if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
 273                      !(sb->s_flags & MS_RDONLY))) {
 274                 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
 275                 /*
 276                  * Sample where the filesystem has been mounted and
 277                  * store it in the superblock for sysadmin convenience
 278                  * when trying to sort through large numbers of block
 279                  * devices or filesystem images.
 280                  */
 281                 memset(buf, 0, sizeof(buf));
 282                 path.mnt = mnt;
 283                 path.dentry = mnt->mnt_root;
 284                 cp = d_path(&path, buf, sizeof(buf));
 285                 if (!IS_ERR(cp)) {
 286                         handle_t *handle;
 287                         int err;
 288
 289                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 290                         if (IS_ERR(handle))
 291                                 return PTR_ERR(handle);
 292                         BUFFER_TRACE(sbi->s_sbh, "get_write_access");
 293                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 294                         if (err) {
 295                                 ext4_journal_stop(handle);
 296                                 return err;
 297                         }
 298                         strlcpy(sbi->s_es->s_last_mounted, cp,
 299                                 sizeof(sbi->s_es->s_last_mounted));
 300                         ext4_handle_dirty_super(handle, sb);
 301                         ext4_journal_stop(handle);
 302                 }
 303         }
 304         if (ext4_encrypted_inode(inode)) {
 305                 ret = ext4_get_encryption_info(inode);
 306                 if (ret)
 307                         return -EACCES;
 308                 if (ext4_encryption_info(inode) == NULL)
 309                         return -ENOKEY;
 310         }
 311         /*
 312          * Set up the jbd2_inode if we are opening the inode for
 313          * writing and the journal is present
 314          */
 315         if (filp->f_mode & FMODE_WRITE) {
 316                 ret = ext4_inode_attach_jinode(inode);
 317                 if (ret < 0)
 318                         return ret;
 319         }
 320         return dquot_file_open(inode, filp);
 321 }
 322
 323 /*
 324  * Here we use ext4_map_blocks() to get a block mapping for a extent-based
 325  * file rather than ext4_ext_walk_space() because we can introduce
 326  * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
 327  * function.  When extent status tree has been fully implemented, it will
 328  * track all extent status for a file and we can directly use it to
 329  * retrieve the offset for SEEK_DATA/SEEK_HOLE.
 330  */
 331
 332 /*
 333  * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
 334  * lookup page cache to check whether or not there has some data between
 335  * [startoff, endoff] because, if this range contains an unwritten extent,
 336  * we determine this extent as a data or a hole according to whether the
 337  * page cache has data or not.
 338  */
 339 static int ext4_find_unwritten_pgoff(struct inode *inode,
 340                                      int whence,
 341                                      struct ext4_map_blocks *map,
 342                                      loff_t *offset)
 343 {
 344         struct pagevec pvec;
 345         unsigned int blkbits;
 346         pgoff_t index;
 347         pgoff_t end;
 348         loff_t endoff;
 349         loff_t startoff;
 350         loff_t lastoff;
 351         int found = 0;
 352
 353         blkbits = inode->i_sb->s_blocksize_bits;
 354         startoff = *offset;
 355         lastoff = startoff;
 356         endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits;
 357
 358         index = startoff >> PAGE_CACHE_SHIFT;
 359         end = endoff >> PAGE_CACHE_SHIFT;
 360
 361         pagevec_init(&pvec, 0);
 362         do {
 363                 int i, num;
 364                 unsigned long nr_pages;
 365
 366                 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
 367                 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
 368                                           (pgoff_t)num);
 369                 if (nr_pages == 0) {
 370                         if (whence == SEEK_DATA)
 371                                 break;
 372
 373                         BUG_ON(whence != SEEK_HOLE);
 374                         /*
 375                          * If this is the first time to go into the loop and
 376                          * offset is not beyond the end offset, it will be a
 377                          * hole at this offset
 378                          */
 379                         if (lastoff == startoff || lastoff < endoff)
 380                                 found = 1;
 381                         break;
 382                 }
 383
 384                 /*
 385                  * If this is the first time to go into the loop and
 386                  * offset is smaller than the first page offset, it will be a
 387                  * hole at this offset.
 388                  */
 389                 if (lastoff == startoff && whence == SEEK_HOLE &&
 390                     lastoff < page_offset(pvec.pages[0])) {
 391                         found = 1;
 392                         break;
 393                 }
 394
 395                 for (i = 0; i < nr_pages; i++) {
 396                         struct page *page = pvec.pages[i];
 397                         struct buffer_head *bh, *head;
 398
 399                         /*
 400                          * If the current offset is not beyond the end of given
 401                          * range, it will be a hole.
 402                          */
 403                         if (lastoff < endoff && whence == SEEK_HOLE &&
 404                             page->index > end) {
 405                                 found = 1;
 406                                 *offset = lastoff;
 407                                 goto out;
 408                         }
 409
 410                         lock_page(page);
 411
 412                         if (unlikely(page->mapping != inode->i_mapping)) {
 413                                 unlock_page(page);
 414                                 continue;
 415                         }
 416
 417                         if (!page_has_buffers(page)) {
 418                                 unlock_page(page);
 419                                 continue;
 420                         }
 421
 422                         if (page_has_buffers(page)) {
 423                                 lastoff = page_offset(page);
 424                                 bh = head = page_buffers(page);
 425                                 do {
 426                                         if (buffer_uptodate(bh) ||
 427                                             buffer_unwritten(bh)) {
 428                                                 if (whence == SEEK_DATA)
 429                                                         found = 1;
 430                                         } else {
 431                                                 if (whence == SEEK_HOLE)
 432                                                         found = 1;
 433                                         }
 434                                         if (found) {
 435                                                 *offset = max_t(loff_t,
 436                                                         startoff, lastoff);
 437                                                 unlock_page(page);
 438                                                 goto out;
 439                                         }
 440                                         lastoff += bh->b_size;
 441                                         bh = bh->b_this_page;
 442                                 } while (bh != head);
 443                         }
 444
 445                         lastoff = page_offset(page) + PAGE_SIZE;
 446                         unlock_page(page);
 447                 }
 448
 449                 /*
 450                  * The no. of pages is less than our desired, that would be a
 451                  * hole in there.
 452                  */
 453                 if (nr_pages < num && whence == SEEK_HOLE) {
 454                         found = 1;
 455                         *offset = lastoff;
 456                         break;
 457                 }
 458
 459                 index = pvec.pages[i - 1]->index + 1;
 460                 pagevec_release(&pvec);
 461         } while (index <= end);
 462
 463 out:
 464         pagevec_release(&pvec);
 465         return found;
 466 }
 467
 468 /*
 469  * ext4_seek_data() retrieves the offset for SEEK_DATA.
 470  */
 471 static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
 472 {
 473         struct inode *inode = file->f_mapping->host;
 474         struct ext4_map_blocks map;
 475         struct extent_status es;
 476         ext4_lblk_t start, last, end;
 477         loff_t dataoff, isize;
 478         int blkbits;
 479         int ret = 0;
 480
 481         mutex_lock(&inode->i_mutex);
 482
 483         isize = i_size_read(inode);
 484         if (offset >= isize) {
 485                 mutex_unlock(&inode->i_mutex);
 486                 return -ENXIO;
 487         }
 488
 489         blkbits = inode->i_sb->s_blocksize_bits;
 490         start = offset >> blkbits;
 491         last = start;
 492         end = isize >> blkbits;
 493         dataoff = offset;
 494
 495         do {
 496                 map.m_lblk = last;
 497                 map.m_len = end - last + 1;
 498                 ret = ext4_map_blocks(NULL, inode, &map, 0);
 499                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
 500                         if (last != start)
 501                                 dataoff = (loff_t)last << blkbits;
 502                         break;
 503                 }
 504
 505                 /*
 506                  * If there is a delay extent at this offset,
 507                  * it will be as a data.
 508                  */
 509                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
 510                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
 511                         if (last != start)
 512                                 dataoff = (loff_t)last << blkbits;
 513                         break;
 514                 }
 515
 516                 /*
 517                  * If there is a unwritten extent at this offset,
 518                  * it will be as a data or a hole according to page
 519                  * cache that has data or not.
 520                  */
 521                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
 522                         int unwritten;
 523                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA,
 524                                                               &map, &dataoff);
 525                         if (unwritten)
 526                                 break;
 527                 }
 528
 529                 last++;
 530                 dataoff = (loff_t)last << blkbits;
 531         } while (last <= end);
 532
 533         mutex_unlock(&inode->i_mutex);
 534
 535         if (dataoff > isize)
 536                 return -ENXIO;
 537
 538         return vfs_setpos(file, dataoff, maxsize);
 539 }
 540
 541 /*
 542  * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
 543  */
 544 static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
 545 {
 546         struct inode *inode = file->f_mapping->host;
 547         struct ext4_map_blocks map;
 548         struct extent_status es;
 549         ext4_lblk_t start, last, end;
 550         loff_t holeoff, isize;
 551         int blkbits;
 552         int ret = 0;
 553
 554         mutex_lock(&inode->i_mutex);
 555
 556         isize = i_size_read(inode);
 557         if (offset >= isize) {
 558                 mutex_unlock(&inode->i_mutex);
 559                 return -ENXIO;
 560         }
 561
 562         blkbits = inode->i_sb->s_blocksize_bits;
 563         start = offset >> blkbits;
 564         last = start;
 565         end = isize >> blkbits;
 566         holeoff = offset;
 567
 568         do {
 569                 map.m_lblk = last;
 570                 map.m_len = end - last + 1;
 571                 ret = ext4_map_blocks(NULL, inode, &map, 0);
 572                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
 573                         last += ret;
 574                         holeoff = (loff_t)last << blkbits;
 575                         continue;
 576                 }
 577
 578                 /*
 579                  * If there is a delay extent at this offset,
 580                  * we will skip this extent.
 581                  */
 582                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
 583                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
 584                         last = es.es_lblk + es.es_len;
 585                         holeoff = (loff_t)last << blkbits;
 586                         continue;
 587                 }
 588
 589                 /*
 590                  * If there is a unwritten extent at this offset,
 591                  * it will be as a data or a hole according to page
 592                  * cache that has data or not.
 593                  */
 594                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
 595                         int unwritten;
 596                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
 597                                                               &map, &holeoff);
 598                         if (!unwritten) {
 599                                 last += ret;
 600                                 holeoff = (loff_t)last << blkbits;
 601                                 continue;
 602                         }
 603                 }
 604
 605                 /* find a hole */
 606                 break;
 607         } while (last <= end);
 608
 609         mutex_unlock(&inode->i_mutex);
 610
 611         if (holeoff > isize)
 612                 holeoff = isize;
 613
 614         return vfs_setpos(file, holeoff, maxsize);
 615 }
 616
 617 /*
 618  * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
 619  * by calling generic_file_llseek_size() with the appropriate maxbytes
 620  * value for each.
 621  */
 622 loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
 623 {
 624         struct inode *inode = file->f_mapping->host;
 625         loff_t maxbytes;
 626
 627         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
 628                 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
 629         else
 630                 maxbytes = inode->i_sb->s_maxbytes;
 631
 632         switch (whence) {
 633         case SEEK_SET:
 634         case SEEK_CUR:
 635         case SEEK_END:
 636                 return generic_file_llseek_size(file, offset, whence,
 637                                                 maxbytes, i_size_read(inode));
 638         case SEEK_DATA:
 639                 return ext4_seek_data(file, offset, maxbytes);
 640         case SEEK_HOLE:
 641                 return ext4_seek_hole(file, offset, maxbytes);
 642         }
 643
 644         return -EINVAL;
 645 }
 646
 647 const struct file_operations ext4_file_operations = {
 648         .llseek         = ext4_llseek,
 649         .read_iter      = generic_file_read_iter,
 650         .write_iter     = ext4_file_write_iter,
 651         .unlocked_ioctl = ext4_ioctl,
 652 #ifdef CONFIG_COMPAT
 653         .compat_ioctl   = ext4_compat_ioctl,
 654 #endif
 655         .mmap           = ext4_file_mmap,
 656         .open           = ext4_file_open,
 657         .release        = ext4_release_file,
 658         .fsync          = ext4_sync_file,
 659         .splice_read    = generic_file_splice_read,
 660         .splice_write   = iter_file_splice_write,
 661         .fallocate      = ext4_fallocate,
 662 };
 663
 664 const struct inode_operations ext4_file_inode_operations = {
 665         .setattr        = ext4_setattr,
 666         .getattr        = ext4_getattr,
 667         .setxattr       = generic_setxattr,
 668         .getxattr       = generic_getxattr,
 669         .listxattr      = ext4_listxattr,
 670         .removexattr    = generic_removexattr,
 671         .get_acl        = ext4_get_acl,
 672         .set_acl        = ext4_set_acl,
 673         .fiemap         = ext4_fiemap,
 674 };
 675