fs/ext4/file.c

   1 /*
   2  *  linux/fs/ext4/file.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card ([email protected])
   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  *      ([email protected])
  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/quotaops.h>
  26 #include <linux/pagevec.h>
  27 #include <linux/uio.h>
  28 #include "ext4.h"
  29 #include "ext4_jbd2.h"
  30 #include "xattr.h"
  31 #include "acl.h"
  32
  33 /*
  34  * Called when an inode is released. Note that this is different
  35  * from ext4_file_open: open gets called at every open, but release
  36  * gets called only when /all/ the files are closed.
  37  */
  38 static int ext4_release_file(struct inode *inode, struct file *filp)
  39 {
  40         if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
  41                 ext4_alloc_da_blocks(inode);
  42                 ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
  43         }
  44         /* if we are the last writer on the inode, drop the block reservation */
  45         if ((filp->f_mode & FMODE_WRITE) &&
  46                         (atomic_read(&inode->i_writecount) == 1) &&
  47                         !EXT4_I(inode)->i_reserved_data_blocks)
  48         {
  49                 down_write(&EXT4_I(inode)->i_data_sem);
  50                 ext4_discard_preallocations(inode);
  51                 up_write(&EXT4_I(inode)->i_data_sem);
  52         }
  53         if (is_dx(inode) && filp->private_data)
  54                 ext4_htree_free_dir_info(filp->private_data);
  55
  56         return 0;
  57 }
  58
  59 static void ext4_unwritten_wait(struct inode *inode)
  60 {
  61         wait_queue_head_t *wq = ext4_ioend_wq(inode);
  62
  63         wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
  64 }
  65
  66 /*
  67  * This tests whether the IO in question is block-aligned or not.
  68  * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
  69  * are converted to written only after the IO is complete.  Until they are
  70  * mapped, these blocks appear as holes, so dio_zero_block() will assume that
  71  * it needs to zero out portions of the start and/or end block.  If 2 AIO
  72  * threads are at work on the same unwritten block, they must be synchronized
  73  * or one thread will zero the other's data, causing corruption.
  74  */
  75 static int
  76 ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos)
  77 {
  78         struct super_block *sb = inode->i_sb;
  79         int blockmask = sb->s_blocksize - 1;
  80
  81         if (pos >= i_size_read(inode))
  82                 return 0;
  83
  84         if ((pos | iov_iter_alignment(from)) & blockmask)
  85                 return 1;
  86
  87         return 0;
  88 }
  89
  90 static ssize_t
  91 ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
  92 {
  93         struct file *file = iocb->ki_filp;
  94         struct inode *inode = file_inode(iocb->ki_filp);
  95         struct mutex *aio_mutex = NULL;
  96         struct blk_plug plug;
  97         int o_direct = iocb->ki_flags & IOCB_DIRECT;
  98         int overwrite = 0;
  99         ssize_t ret;
 100
 101         /*
 102          * Unaligned direct AIO must be serialized; see comment above
 103          * In the case of O_APPEND, assume that we must always serialize
 104          */
 105         if (o_direct &&
 106             ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
 107             !is_sync_kiocb(iocb) &&
 108             (iocb->ki_flags & IOCB_APPEND ||
 109              ext4_unaligned_aio(inode, from, iocb->ki_pos))) {
 110                 aio_mutex = ext4_aio_mutex(inode);
 111                 mutex_lock(aio_mutex);
 112                 ext4_unwritten_wait(inode);
 113         }
 114
 115         mutex_lock(&inode->i_mutex);
 116         ret = generic_write_checks(iocb, from);
 117         if (ret <= 0)
 118                 goto out;
 119
 120         /*
 121          * If we have encountered a bitmap-format file, the size limit
 122          * is smaller than s_maxbytes, which is for extent-mapped files.
 123          */
 124         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
 125                 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 126
 127                 if (iocb->ki_pos >= sbi->s_bitmap_maxbytes) {
 128                         ret = -EFBIG;
 129                         goto out;
 130                 }
 131                 iov_iter_truncate(from, sbi->s_bitmap_maxbytes - iocb->ki_pos);
 132         }
 133
 134         iocb->private = &overwrite;
 135         if (o_direct) {
 136                 size_t length = iov_iter_count(from);
 137                 loff_t pos = iocb->ki_pos;
 138                 blk_start_plug(&plug);
 139
 140                 /* check whether we do a DIO overwrite or not */
 141                 if (ext4_should_dioread_nolock(inode) && !aio_mutex &&
 142                     !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
 143                         struct ext4_map_blocks map;
 144                         unsigned int blkbits = inode->i_blkbits;
 145                         int err, len;
 146
 147                         map.m_lblk = pos >> blkbits;
 148                         map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
 149                                 - map.m_lblk;
 150                         len = map.m_len;
 151
 152                         err = ext4_map_blocks(NULL, inode, &map, 0);
 153                         /*
 154                          * 'err==len' means that all of blocks has
 155                          * been preallocated no matter they are
 156                          * initialized or not.  For excluding
 157                          * unwritten extents, we need to check
 158                          * m_flags.  There are two conditions that
 159                          * indicate for initialized extents.  1) If we
 160                          * hit extent cache, EXT4_MAP_MAPPED flag is
 161                          * returned; 2) If we do a real lookup,
 162                          * non-flags are returned.  So we should check
 163                          * these two conditions.
 164                          */
 165                         if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
 166                                 overwrite = 1;
 167                 }
 168         }
 169
 170         ret = __generic_file_write_iter(iocb, from);
 171         mutex_unlock(&inode->i_mutex);
 172
 173         if (ret > 0) {
 174                 ssize_t err;
 175
 176                 err = generic_write_sync(file, iocb->ki_pos - ret, ret);
 177                 if (err < 0)
 178                         ret = err;
 179         }
 180         if (o_direct)
 181                 blk_finish_plug(&plug);
 182
 183         if (aio_mutex)
 184                 mutex_unlock(aio_mutex);
 185         return ret;
 186
 187 out:
 188         mutex_unlock(&inode->i_mutex);
 189         if (aio_mutex)
 190                 mutex_unlock(aio_mutex);
 191         return ret;
 192 }
 193
 194 #ifdef CONFIG_FS_DAX
 195 static void ext4_end_io_unwritten(struct buffer_head *bh, int uptodate)
 196 {
 197         struct inode *inode = bh->b_assoc_map->host;
 198         /* XXX: breaks on 32-bit > 16GB. Is that even supported? */
 199         loff_t offset = (loff_t)(uintptr_t)bh->b_private << inode->i_blkbits;
 200         int err;
 201         if (!uptodate)
 202                 return;
 203         WARN_ON(!buffer_unwritten(bh));
 204         err = ext4_convert_unwritten_extents(NULL, inode, offset, bh->b_size);
 205 }
 206
 207 static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 208 {
 209         return dax_fault(vma, vmf, ext4_get_block, ext4_end_io_unwritten);
 210                                         /* Is this the right get_block? */
 211 }
 212
 213 static int ext4_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 214 {
 215         return dax_mkwrite(vma, vmf, ext4_get_block, ext4_end_io_unwritten);
 216 }
 217
 218 static const struct vm_operations_struct ext4_dax_vm_ops = {
 219         .fault          = ext4_dax_fault,
 220         .page_mkwrite   = ext4_dax_mkwrite,
 221         .pfn_mkwrite    = dax_pfn_mkwrite,
 222 };
 223 #else
 224 #define ext4_dax_vm_ops ext4_file_vm_ops
 225 #endif
 226
 227 static const struct vm_operations_struct ext4_file_vm_ops = {
 228         .fault          = filemap_fault,
 229         .map_pages      = filemap_map_pages,
 230         .page_mkwrite   = ext4_page_mkwrite,
 231 };
 232
 233 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
 234 {
 235         struct inode *inode = file->f_mapping->host;
 236
 237         if (ext4_encrypted_inode(inode)) {
 238                 int err = ext4_get_encryption_info(inode);
 239                 if (err)
 240                         return 0;
 241                 if (ext4_encryption_info(inode) == NULL)
 242                         return -ENOKEY;
 243         }
 244         file_accessed(file);
 245         if (IS_DAX(file_inode(file))) {
 246                 vma->vm_ops = &ext4_dax_vm_ops;
 247                 vma->vm_flags |= VM_MIXEDMAP;
 248         } else {
 249                 vma->vm_ops = &ext4_file_vm_ops;
 250         }
 251         return 0;
 252 }
 253
 254 static int ext4_file_open(struct inode * inode, struct file * filp)
 255 {
 256         struct super_block *sb = inode->i_sb;
 257         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 258         struct vfsmount *mnt = filp->f_path.mnt;
 259         struct path path;
 260         char buf[64], *cp;
 261         int ret;
 262
 263         if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
 264                      !(sb->s_flags & MS_RDONLY))) {
 265                 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
 266                 /*
 267                  * Sample where the filesystem has been mounted and
 268                  * store it in the superblock for sysadmin convenience
 269                  * when trying to sort through large numbers of block
 270                  * devices or filesystem images.
 271                  */
 272                 memset(buf, 0, sizeof(buf));
 273                 path.mnt = mnt;
 274                 path.dentry = mnt->mnt_root;
 275                 cp = d_path(&path, buf, sizeof(buf));
 276                 if (!IS_ERR(cp)) {
 277                         handle_t *handle;
 278                         int err;
 279
 280                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 281                         if (IS_ERR(handle))
 282                                 return PTR_ERR(handle);
 283                         BUFFER_TRACE(sbi->s_sbh, "get_write_access");
 284                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 285                         if (err) {
 286                                 ext4_journal_stop(handle);
 287                                 return err;
 288                         }
 289                         strlcpy(sbi->s_es->s_last_mounted, cp,
 290                                 sizeof(sbi->s_es->s_last_mounted));
 291                         ext4_handle_dirty_super(handle, sb);
 292                         ext4_journal_stop(handle);
 293                 }
 294         }
 295         if (ext4_encrypted_inode(inode)) {
 296                 ret = ext4_get_encryption_info(inode);
 297                 if (ret)
 298                         return -EACCES;
 299                 if (ext4_encryption_info(inode) == NULL)
 300                         return -ENOKEY;
 301         }
 302         /*
 303          * Set up the jbd2_inode if we are opening the inode for
 304          * writing and the journal is present
 305          */
 306         if (filp->f_mode & FMODE_WRITE) {
 307                 ret = ext4_inode_attach_jinode(inode);
 308                 if (ret < 0)
 309                         return ret;
 310         }
 311         return dquot_file_open(inode, filp);
 312 }
 313
 314 /*
 315  * Here we use ext4_map_blocks() to get a block mapping for a extent-based
 316  * file rather than ext4_ext_walk_space() because we can introduce
 317  * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
 318  * function.  When extent status tree has been fully implemented, it will
 319  * track all extent status for a file and we can directly use it to
 320  * retrieve the offset for SEEK_DATA/SEEK_HOLE.
 321  */
 322
 323 /*
 324  * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
 325  * lookup page cache to check whether or not there has some data between
 326  * [startoff, endoff] because, if this range contains an unwritten extent,
 327  * we determine this extent as a data or a hole according to whether the
 328  * page cache has data or not.
 329  */
 330 static int ext4_find_unwritten_pgoff(struct inode *inode,
 331                                      int whence,
 332                                      struct ext4_map_blocks *map,
 333                                      loff_t *offset)
 334 {
 335         struct pagevec pvec;
 336         unsigned int blkbits;
 337         pgoff_t index;
 338         pgoff_t end;
 339         loff_t endoff;
 340         loff_t startoff;
 341         loff_t lastoff;
 342         int found = 0;
 343
 344         blkbits = inode->i_sb->s_blocksize_bits;
 345         startoff = *offset;
 346         lastoff = startoff;
 347         endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits;
 348
 349         index = startoff >> PAGE_CACHE_SHIFT;
 350         end = endoff >> PAGE_CACHE_SHIFT;
 351
 352         pagevec_init(&pvec, 0);
 353         do {
 354                 int i, num;
 355                 unsigned long nr_pages;
 356
 357                 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
 358                 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
 359                                           (pgoff_t)num);
 360                 if (nr_pages == 0) {
 361                         if (whence == SEEK_DATA)
 362                                 break;
 363
 364                         BUG_ON(whence != SEEK_HOLE);
 365                         /*
 366                          * If this is the first time to go into the loop and
 367                          * offset is not beyond the end offset, it will be a
 368                          * hole at this offset
 369                          */
 370                         if (lastoff == startoff || lastoff < endoff)
 371                                 found = 1;
 372                         break;
 373                 }
 374
 375                 /*
 376                  * If this is the first time to go into the loop and
 377                  * offset is smaller than the first page offset, it will be a
 378                  * hole at this offset.
 379                  */
 380                 if (lastoff == startoff && whence == SEEK_HOLE &&
 381                     lastoff < page_offset(pvec.pages[0])) {
 382                         found = 1;
 383                         break;
 384                 }
 385
 386                 for (i = 0; i < nr_pages; i++) {
 387                         struct page *page = pvec.pages[i];
 388                         struct buffer_head *bh, *head;
 389
 390                         /*
 391                          * If the current offset is not beyond the end of given
 392                          * range, it will be a hole.
 393                          */
 394                         if (lastoff < endoff && whence == SEEK_HOLE &&
 395                             page->index > end) {
 396                                 found = 1;
 397                                 *offset = lastoff;
 398                                 goto out;
 399                         }
 400
 401                         lock_page(page);
 402
 403                         if (unlikely(page->mapping != inode->i_mapping)) {
 404                                 unlock_page(page);
 405                                 continue;
 406                         }
 407
 408                         if (!page_has_buffers(page)) {
 409                                 unlock_page(page);
 410                                 continue;
 411                         }
 412
 413                         if (page_has_buffers(page)) {
 414                                 lastoff = page_offset(page);
 415                                 bh = head = page_buffers(page);
 416                                 do {
 417                                         if (buffer_uptodate(bh) ||
 418                                             buffer_unwritten(bh)) {
 419                                                 if (whence == SEEK_DATA)
 420                                                         found = 1;
 421                                         } else {
 422                                                 if (whence == SEEK_HOLE)
 423                                                         found = 1;
 424                                         }
 425                                         if (found) {
 426                                                 *offset = max_t(loff_t,
 427                                                         startoff, lastoff);
 428                                                 unlock_page(page);
 429                                                 goto out;
 430                                         }
 431                                         lastoff += bh->b_size;
 432                                         bh = bh->b_this_page;
 433                                 } while (bh != head);
 434                         }
 435
 436                         lastoff = page_offset(page) + PAGE_SIZE;
 437                         unlock_page(page);
 438                 }
 439
 440                 /*
 441                  * The no. of pages is less than our desired, that would be a
 442                  * hole in there.
 443                  */
 444                 if (nr_pages < num && whence == SEEK_HOLE) {
 445                         found = 1;
 446                         *offset = lastoff;
 447                         break;
 448                 }
 449
 450                 index = pvec.pages[i - 1]->index + 1;
 451                 pagevec_release(&pvec);
 452         } while (index <= end);
 453
 454 out:
 455         pagevec_release(&pvec);
 456         return found;
 457 }
 458
 459 /*
 460  * ext4_seek_data() retrieves the offset for SEEK_DATA.
 461  */
 462 static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
 463 {
 464         struct inode *inode = file->f_mapping->host;
 465         struct ext4_map_blocks map;
 466         struct extent_status es;
 467         ext4_lblk_t start, last, end;
 468         loff_t dataoff, isize;
 469         int blkbits;
 470         int ret = 0;
 471
 472         mutex_lock(&inode->i_mutex);
 473
 474         isize = i_size_read(inode);
 475         if (offset >= isize) {
 476                 mutex_unlock(&inode->i_mutex);
 477                 return -ENXIO;
 478         }
 479
 480         blkbits = inode->i_sb->s_blocksize_bits;
 481         start = offset >> blkbits;
 482         last = start;
 483         end = isize >> blkbits;
 484         dataoff = offset;
 485
 486         do {
 487                 map.m_lblk = last;
 488                 map.m_len = end - last + 1;
 489                 ret = ext4_map_blocks(NULL, inode, &map, 0);
 490                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
 491                         if (last != start)
 492                                 dataoff = (loff_t)last << blkbits;
 493                         break;
 494                 }
 495
 496                 /*
 497                  * If there is a delay extent at this offset,
 498                  * it will be as a data.
 499                  */
 500                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
 501                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
 502                         if (last != start)
 503                                 dataoff = (loff_t)last << blkbits;
 504                         break;
 505                 }
 506
 507                 /*
 508                  * If there is a unwritten extent at this offset,
 509                  * it will be as a data or a hole according to page
 510                  * cache that has data or not.
 511                  */
 512                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
 513                         int unwritten;
 514                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA,
 515                                                               &map, &dataoff);
 516                         if (unwritten)
 517                                 break;
 518                 }
 519
 520                 last++;
 521                 dataoff = (loff_t)last << blkbits;
 522         } while (last <= end);
 523
 524         mutex_unlock(&inode->i_mutex);
 525
 526         if (dataoff > isize)
 527                 return -ENXIO;
 528
 529         return vfs_setpos(file, dataoff, maxsize);
 530 }
 531
 532 /*
 533  * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
 534  */
 535 static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
 536 {
 537         struct inode *inode = file->f_mapping->host;
 538         struct ext4_map_blocks map;
 539         struct extent_status es;
 540         ext4_lblk_t start, last, end;
 541         loff_t holeoff, isize;
 542         int blkbits;
 543         int ret = 0;
 544
 545         mutex_lock(&inode->i_mutex);
 546
 547         isize = i_size_read(inode);
 548         if (offset >= isize) {
 549                 mutex_unlock(&inode->i_mutex);
 550                 return -ENXIO;
 551         }
 552
 553         blkbits = inode->i_sb->s_blocksize_bits;
 554         start = offset >> blkbits;
 555         last = start;
 556         end = isize >> blkbits;
 557         holeoff = offset;
 558
 559         do {
 560                 map.m_lblk = last;
 561                 map.m_len = end - last + 1;
 562                 ret = ext4_map_blocks(NULL, inode, &map, 0);
 563                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
 564                         last += ret;
 565                         holeoff = (loff_t)last << blkbits;
 566                         continue;
 567                 }
 568
 569                 /*
 570                  * If there is a delay extent at this offset,
 571                  * we will skip this extent.
 572                  */
 573                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
 574                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
 575                         last = es.es_lblk + es.es_len;
 576                         holeoff = (loff_t)last << blkbits;
 577                         continue;
 578                 }
 579
 580                 /*
 581                  * If there is a unwritten extent at this offset,
 582                  * it will be as a data or a hole according to page
 583                  * cache that has data or not.
 584                  */
 585                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
 586                         int unwritten;
 587                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
 588                                                               &map, &holeoff);
 589                         if (!unwritten) {
 590                                 last += ret;
 591                                 holeoff = (loff_t)last << blkbits;
 592                                 continue;
 593                         }
 594                 }
 595
 596                 /* find a hole */
 597                 break;
 598         } while (last <= end);
 599
 600         mutex_unlock(&inode->i_mutex);
 601
 602         if (holeoff > isize)
 603                 holeoff = isize;
 604
 605         return vfs_setpos(file, holeoff, maxsize);
 606 }
 607
 608 /*
 609  * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
 610  * by calling generic_file_llseek_size() with the appropriate maxbytes
 611  * value for each.
 612  */
 613 loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
 614 {
 615         struct inode *inode = file->f_mapping->host;
 616         loff_t maxbytes;
 617
 618         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
 619                 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
 620         else
 621                 maxbytes = inode->i_sb->s_maxbytes;
 622
 623         switch (whence) {
 624         case SEEK_SET:
 625         case SEEK_CUR:
 626         case SEEK_END:
 627                 return generic_file_llseek_size(file, offset, whence,
 628                                                 maxbytes, i_size_read(inode));
 629         case SEEK_DATA:
 630                 return ext4_seek_data(file, offset, maxbytes);
 631         case SEEK_HOLE:
 632                 return ext4_seek_hole(file, offset, maxbytes);
 633         }
 634
 635         return -EINVAL;
 636 }
 637
 638 const struct file_operations ext4_file_operations = {
 639         .llseek         = ext4_llseek,
 640         .read_iter      = generic_file_read_iter,
 641         .write_iter     = ext4_file_write_iter,
 642         .unlocked_ioctl = ext4_ioctl,
 643 #ifdef CONFIG_COMPAT
 644         .compat_ioctl   = ext4_compat_ioctl,
 645 #endif
 646         .mmap           = ext4_file_mmap,
 647         .open           = ext4_file_open,
 648         .release        = ext4_release_file,
 649         .fsync          = ext4_sync_file,
 650         .splice_read    = generic_file_splice_read,
 651         .splice_write   = iter_file_splice_write,
 652         .fallocate      = ext4_fallocate,
 653 };
 654
 655 const struct inode_operations ext4_file_inode_operations = {
 656         .setattr        = ext4_setattr,
 657         .getattr        = ext4_getattr,
 658         .setxattr       = generic_setxattr,
 659         .getxattr       = generic_getxattr,
 660         .listxattr      = ext4_listxattr,
 661         .removexattr    = generic_removexattr,
 662         .get_acl        = ext4_get_acl,
 663         .set_acl        = ext4_set_acl,
 664         .fiemap         = ext4_fiemap,
 665 };
 666