module/zfs/zpl_file.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
  23  */
  24
  25
  26 #include <sys/dmu_objset.h>
  27 #include <sys/zfs_vfsops.h>
  28 #include <sys/zfs_vnops.h>
  29 #include <sys/zfs_znode.h>
  30 #include <sys/zpl.h>
  31
  32
  33 static int
  34 zpl_open(struct inode *ip, struct file *filp)
  35 {
  36         cred_t *cr = CRED();
  37         int error;
  38
  39         error = generic_file_open(ip, filp);
  40         if (error)
  41                 return (error);
  42
  43         crhold(cr);
  44         error = -zfs_open(ip, filp->f_mode, filp->f_flags, cr);
  45         crfree(cr);
  46         ASSERT3S(error, <=, 0);
  47
  48         return (error);
  49 }
  50
  51 static int
  52 zpl_release(struct inode *ip, struct file *filp)
  53 {
  54         cred_t *cr = CRED();
  55         int error;
  56
  57         if (ITOZ(ip)->z_atime_dirty)
  58                 zfs_mark_inode_dirty(ip);
  59
  60         crhold(cr);
  61         error = -zfs_close(ip, filp->f_flags, cr);
  62         crfree(cr);
  63         ASSERT3S(error, <=, 0);
  64
  65         return (error);
  66 }
  67
  68 static int
  69 zpl_iterate(struct file *filp, struct dir_context *ctx)
  70 {
  71         struct dentry *dentry = filp->f_path.dentry;
  72         cred_t *cr = CRED();
  73         int error;
  74
  75         crhold(cr);
  76         error = -zfs_readdir(dentry->d_inode, ctx, cr);
  77         crfree(cr);
  78         ASSERT3S(error, <=, 0);
  79
  80         return (error);
  81 }
  82
  83 #if !defined(HAVE_VFS_ITERATE)
  84 static int
  85 zpl_readdir(struct file *filp, void *dirent, filldir_t filldir)
  86 {
  87         struct dir_context ctx = DIR_CONTEXT_INIT(dirent, filldir, filp->f_pos);
  88         int error;
  89
  90         error = zpl_iterate(filp, &ctx);
  91         filp->f_pos = ctx.pos;
  92
  93         return (error);
  94 }
  95 #endif /* HAVE_VFS_ITERATE */
  96
  97 #if defined(HAVE_FSYNC_WITH_DENTRY)
  98 /*
  99  * Linux 2.6.x - 2.6.34 API,
 100  * Through 2.6.34 the nfsd kernel server would pass a NULL 'file struct *'
 101  * to the fops->fsync() hook.  For this reason, we must be careful not to
 102  * use filp unconditionally.
 103  */
 104 static int
 105 zpl_fsync(struct file *filp, struct dentry *dentry, int datasync)
 106 {
 107         cred_t *cr = CRED();
 108         int error;
 109
 110         crhold(cr);
 111         error = -zfs_fsync(dentry->d_inode, datasync, cr);
 112         crfree(cr);
 113         ASSERT3S(error, <=, 0);
 114
 115         return (error);
 116 }
 117
 118 #elif defined(HAVE_FSYNC_WITHOUT_DENTRY)
 119 /*
 120  * Linux 2.6.35 - 3.0 API,
 121  * As of 2.6.35 the dentry argument to the fops->fsync() hook was deemed
 122  * redundant.  The dentry is still accessible via filp->f_path.dentry,
 123  * and we are guaranteed that filp will never be NULL.
 124  */
 125 static int
 126 zpl_fsync(struct file *filp, int datasync)
 127 {
 128         struct inode *inode = filp->f_mapping->host;
 129         cred_t *cr = CRED();
 130         int error;
 131
 132         crhold(cr);
 133         error = -zfs_fsync(inode, datasync, cr);
 134         crfree(cr);
 135         ASSERT3S(error, <=, 0);
 136
 137         return (error);
 138 }
 139
 140 #elif defined(HAVE_FSYNC_RANGE)
 141 /*
 142  * Linux 3.1 - 3.x API,
 143  * As of 3.1 the responsibility to call filemap_write_and_wait_range() has
 144  * been pushed down in to the .fsync() vfs hook.  Additionally, the i_mutex
 145  * lock is no longer held by the caller, for zfs we don't require the lock
 146  * to be held so we don't acquire it.
 147  */
 148 static int
 149 zpl_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 150 {
 151         struct inode *inode = filp->f_mapping->host;
 152         cred_t *cr = CRED();
 153         int error;
 154
 155         error = filemap_write_and_wait_range(inode->i_mapping, start, end);
 156         if (error)
 157                 return (error);
 158
 159         crhold(cr);
 160         error = -zfs_fsync(inode, datasync, cr);
 161         crfree(cr);
 162         ASSERT3S(error, <=, 0);
 163
 164         return (error);
 165 }
 166 #else
 167 #error "Unsupported fops->fsync() implementation"
 168 #endif
 169
 170 ssize_t
 171 zpl_read_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
 172     uio_seg_t segment, int flags, cred_t *cr)
 173 {
 174         int error;
 175         ssize_t read;
 176         struct iovec iov;
 177         uio_t uio;
 178
 179         iov.iov_base = (void *)buf;
 180         iov.iov_len = len;
 181
 182         uio.uio_iov = &iov;
 183         uio.uio_resid = len;
 184         uio.uio_iovcnt = 1;
 185         uio.uio_loffset = pos;
 186         uio.uio_limit = MAXOFFSET_T;
 187         uio.uio_segflg = segment;
 188
 189         error = -zfs_read(ip, &uio, flags, cr);
 190         if (error < 0)
 191                 return (error);
 192
 193         read = len - uio.uio_resid;
 194         task_io_account_read(read);
 195
 196         return (read);
 197 }
 198
 199 static ssize_t
 200 zpl_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
 201 {
 202         cred_t *cr = CRED();
 203         ssize_t read;
 204
 205         crhold(cr);
 206         read = zpl_read_common(filp->f_mapping->host, buf, len, *ppos,
 207             UIO_USERSPACE, filp->f_flags, cr);
 208         crfree(cr);
 209
 210         if (read < 0)
 211                 return (read);
 212
 213         *ppos += read;
 214         return (read);
 215 }
 216
 217 ssize_t
 218 zpl_write_common(struct inode *ip, const char *buf, size_t len, loff_t pos,
 219     uio_seg_t segment, int flags, cred_t *cr)
 220 {
 221         int error;
 222         ssize_t wrote;
 223         struct iovec iov;
 224         uio_t uio;
 225
 226         iov.iov_base = (void *)buf;
 227         iov.iov_len = len;
 228
 229         uio.uio_iov = &iov;
 230         uio.uio_resid = len,
 231         uio.uio_iovcnt = 1;
 232         uio.uio_loffset = pos;
 233         uio.uio_limit = MAXOFFSET_T;
 234         uio.uio_segflg = segment;
 235
 236         error = -zfs_write(ip, &uio, flags, cr);
 237         if (error < 0)
 238                 return (error);
 239
 240         wrote = len - uio.uio_resid;
 241         task_io_account_write(wrote);
 242
 243         return (wrote);
 244 }
 245
 246 static ssize_t
 247 zpl_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
 248 {
 249         cred_t *cr = CRED();
 250         ssize_t wrote;
 251
 252         crhold(cr);
 253         wrote = zpl_write_common(filp->f_mapping->host, buf, len, *ppos,
 254             UIO_USERSPACE, filp->f_flags, cr);
 255         crfree(cr);
 256
 257         if (wrote < 0)
 258                 return (wrote);
 259
 260         *ppos += wrote;
 261         return (wrote);
 262 }
 263
 264 static loff_t
 265 zpl_llseek(struct file *filp, loff_t offset, int whence)
 266 {
 267 #if defined(SEEK_HOLE) && defined(SEEK_DATA)
 268         if (whence == SEEK_DATA || whence == SEEK_HOLE) {
 269                 struct inode *ip = filp->f_mapping->host;
 270                 loff_t maxbytes = ip->i_sb->s_maxbytes;
 271                 loff_t error;
 272
 273                 spl_inode_lock(ip);
 274                 error = -zfs_holey(ip, whence, &offset);
 275                 if (error == 0)
 276                         error = lseek_execute(filp, ip, offset, maxbytes);
 277                 spl_inode_unlock(ip);
 278
 279                 return (error);
 280         }
 281 #endif /* SEEK_HOLE && SEEK_DATA */
 282
 283         return (generic_file_llseek(filp, offset, whence));
 284 }
 285
 286 /*
 287  * It's worth taking a moment to describe how mmap is implemented
 288  * for zfs because it differs considerably from other Linux filesystems.
 289  * However, this issue is handled the same way under OpenSolaris.
 290  *
 291  * The issue is that by design zfs bypasses the Linux page cache and
 292  * leaves all caching up to the ARC.  This has been shown to work
 293  * well for the common read(2)/write(2) case.  However, mmap(2)
 294  * is problem because it relies on being tightly integrated with the
 295  * page cache.  To handle this we cache mmap'ed files twice, once in
 296  * the ARC and a second time in the page cache.  The code is careful
 297  * to keep both copies synchronized.
 298  *
 299  * When a file with an mmap'ed region is written to using write(2)
 300  * both the data in the ARC and existing pages in the page cache
 301  * are updated.  For a read(2) data will be read first from the page
 302  * cache then the ARC if needed.  Neither a write(2) or read(2) will
 303  * will ever result in new pages being added to the page cache.
 304  *
 305  * New pages are added to the page cache only via .readpage() which
 306  * is called when the vfs needs to read a page off disk to back the
 307  * virtual memory region.  These pages may be modified without
 308  * notifying the ARC and will be written out periodically via
 309  * .writepage().  This will occur due to either a sync or the usual
 310  * page aging behavior.  Note because a read(2) of a mmap'ed file
 311  * will always check the page cache first even when the ARC is out
 312  * of date correct data will still be returned.
 313  *
 314  * While this implementation ensures correct behavior it does have
 315  * have some drawbacks.  The most obvious of which is that it
 316  * increases the required memory footprint when access mmap'ed
 317  * files.  It also adds additional complexity to the code keeping
 318  * both caches synchronized.
 319  *
 320  * Longer term it may be possible to cleanly resolve this wart by
 321  * mapping page cache pages directly on to the ARC buffers.  The
 322  * Linux address space operations are flexible enough to allow
 323  * selection of which pages back a particular index.  The trick
 324  * would be working out the details of which subsystem is in
 325  * charge, the ARC, the page cache, or both.  It may also prove
 326  * helpful to move the ARC buffers to a scatter-gather lists
 327  * rather than a vmalloc'ed region.
 328  */
 329 static int
 330 zpl_mmap(struct file *filp, struct vm_area_struct *vma)
 331 {
 332         struct inode *ip = filp->f_mapping->host;
 333         znode_t *zp = ITOZ(ip);
 334         int error;
 335
 336         error = -zfs_map(ip, vma->vm_pgoff, (caddr_t *)vma->vm_start,
 337             (size_t)(vma->vm_end - vma->vm_start), vma->vm_flags);
 338         if (error)
 339                 return (error);
 340
 341         error = generic_file_mmap(filp, vma);
 342         if (error)
 343                 return (error);
 344
 345         mutex_enter(&zp->z_lock);
 346         zp->z_is_mapped = 1;
 347         mutex_exit(&zp->z_lock);
 348
 349         return (error);
 350 }
 351
 352 /*
 353  * Populate a page with data for the Linux page cache.  This function is
 354  * only used to support mmap(2).  There will be an identical copy of the
 355  * data in the ARC which is kept up to date via .write() and .writepage().
 356  *
 357  * Current this function relies on zpl_read_common() and the O_DIRECT
 358  * flag to read in a page.  This works but the more correct way is to
 359  * update zfs_fillpage() to be Linux friendly and use that interface.
 360  */
 361 static int
 362 zpl_readpage(struct file *filp, struct page *pp)
 363 {
 364         struct inode *ip;
 365         struct page *pl[1];
 366         int error = 0;
 367
 368         ASSERT(PageLocked(pp));
 369         ip = pp->mapping->host;
 370         pl[0] = pp;
 371
 372         error = -zfs_getpage(ip, pl, 1);
 373
 374         if (error) {
 375                 SetPageError(pp);
 376                 ClearPageUptodate(pp);
 377         } else {
 378                 ClearPageError(pp);
 379                 SetPageUptodate(pp);
 380                 flush_dcache_page(pp);
 381         }
 382
 383         unlock_page(pp);
 384         return (error);
 385 }
 386
 387 /*
 388  * Populate a set of pages with data for the Linux page cache.  This
 389  * function will only be called for read ahead and never for demand
 390  * paging.  For simplicity, the code relies on read_cache_pages() to
 391  * correctly lock each page for IO and call zpl_readpage().
 392  */
 393 static int
 394 zpl_readpages(struct file *filp, struct address_space *mapping,
 395         struct list_head *pages, unsigned nr_pages)
 396 {
 397         return (read_cache_pages(mapping, pages,
 398             (filler_t *)zpl_readpage, filp));
 399 }
 400
 401 int
 402 zpl_putpage(struct page *pp, struct writeback_control *wbc, void *data)
 403 {
 404         struct address_space *mapping = data;
 405
 406         ASSERT(PageLocked(pp));
 407         ASSERT(!PageWriteback(pp));
 408         ASSERT(!(current->flags & PF_NOFS));
 409
 410         /*
 411          * Annotate this call path with a flag that indicates that it is
 412          * unsafe to use KM_SLEEP during memory allocations due to the
 413          * potential for a deadlock.  KM_PUSHPAGE should be used instead.
 414          */
 415         current->flags |= PF_NOFS;
 416         (void) zfs_putpage(mapping->host, pp, wbc);
 417         current->flags &= ~PF_NOFS;
 418
 419         return (0);
 420 }
 421
 422 static int
 423 zpl_writepages(struct address_space *mapping, struct writeback_control *wbc)
 424 {
 425         znode_t         *zp = ITOZ(mapping->host);
 426         zfs_sb_t        *zsb = ITOZSB(mapping->host);
 427         enum writeback_sync_modes sync_mode;
 428         int result;
 429
 430         ZFS_ENTER(zsb);
 431         if (zsb->z_os->os_sync == ZFS_SYNC_ALWAYS)
 432                 wbc->sync_mode = WB_SYNC_ALL;
 433         ZFS_EXIT(zsb);
 434         sync_mode = wbc->sync_mode;
 435
 436         /*
 437          * We don't want to run write_cache_pages() in SYNC mode here, because
 438          * that would make putpage() wait for a single page to be committed to
 439          * disk every single time, resulting in atrocious performance. Instead
 440          * we run it once in non-SYNC mode so that the ZIL gets all the data,
 441          * and then we commit it all in one go.
 442          */
 443         wbc->sync_mode = WB_SYNC_NONE;
 444         result = write_cache_pages(mapping, wbc, zpl_putpage, mapping);
 445         if (sync_mode != wbc->sync_mode) {
 446                 ZFS_ENTER(zsb);
 447                 ZFS_VERIFY_ZP(zp);
 448                 if (zsb->z_log != NULL)
 449                         zil_commit(zsb->z_log, zp->z_id);
 450                 ZFS_EXIT(zsb);
 451
 452                 /*
 453                  * We need to call write_cache_pages() again (we can't just
 454                  * return after the commit) because the previous call in
 455                  * non-SYNC mode does not guarantee that we got all the dirty
 456                  * pages (see the implementation of write_cache_pages() for
 457                  * details). That being said, this is a no-op in most cases.
 458                  */
 459                 wbc->sync_mode = sync_mode;
 460                 result = write_cache_pages(mapping, wbc, zpl_putpage, mapping);
 461         }
 462         return (result);
 463 }
 464
 465 /*
 466  * Write out dirty pages to the ARC, this function is only required to
 467  * support mmap(2).  Mapped pages may be dirtied by memory operations
 468  * which never call .write().  These dirty pages are kept in sync with
 469  * the ARC buffers via this hook.
 470  */
 471 static int
 472 zpl_writepage(struct page *pp, struct writeback_control *wbc)
 473 {
 474         if (ITOZSB(pp->mapping->host)->z_os->os_sync == ZFS_SYNC_ALWAYS)
 475                 wbc->sync_mode = WB_SYNC_ALL;
 476
 477         return (zpl_putpage(pp, wbc, pp->mapping));
 478 }
 479
 480 /*
 481  * The only flag combination which matches the behavior of zfs_space()
 482  * is FALLOC_FL_PUNCH_HOLE.  This flag was introduced in the 2.6.38 kernel.
 483  */
 484 long
 485 zpl_fallocate_common(struct inode *ip, int mode, loff_t offset, loff_t len)
 486 {
 487         cred_t *cr = CRED();
 488         int error = -EOPNOTSUPP;
 489
 490         if (mode & FALLOC_FL_KEEP_SIZE)
 491                 return (-EOPNOTSUPP);
 492
 493         crhold(cr);
 494
 495 #ifdef FALLOC_FL_PUNCH_HOLE
 496         if (mode & FALLOC_FL_PUNCH_HOLE) {
 497                 flock64_t bf;
 498
 499                 bf.l_type = F_WRLCK;
 500                 bf.l_whence = 0;
 501                 bf.l_start = offset;
 502                 bf.l_len = len;
 503                 bf.l_pid = 0;
 504
 505                 error = -zfs_space(ip, F_FREESP, &bf, FWRITE, offset, cr);
 506         }
 507 #endif /* FALLOC_FL_PUNCH_HOLE */
 508
 509         crfree(cr);
 510
 511         ASSERT3S(error, <=, 0);
 512         return (error);
 513 }
 514
 515 #ifdef HAVE_FILE_FALLOCATE
 516 static long
 517 zpl_fallocate(struct file *filp, int mode, loff_t offset, loff_t len)
 518 {
 519         return zpl_fallocate_common(filp->f_path.dentry->d_inode,
 520             mode, offset, len);
 521 }
 522 #endif /* HAVE_FILE_FALLOCATE */
 523
 524 /*
 525  * Map zfs file z_pflags (xvattr_t) to linux file attributes. Only file
 526  * attributes common to both Linux and Solaris are mapped.
 527  */
 528 static int
 529 zpl_ioctl_getflags(struct file *filp, void __user *arg)
 530 {
 531         struct inode *ip = filp->f_dentry->d_inode;
 532         unsigned int ioctl_flags = 0;
 533         uint64_t zfs_flags = ITOZ(ip)->z_pflags;
 534         int error;
 535
 536         if (zfs_flags & ZFS_IMMUTABLE)
 537                 ioctl_flags |= FS_IMMUTABLE_FL;
 538
 539         if (zfs_flags & ZFS_APPENDONLY)
 540                 ioctl_flags |= FS_APPEND_FL;
 541
 542         if (zfs_flags & ZFS_NODUMP)
 543                 ioctl_flags |= FS_NODUMP_FL;
 544
 545         ioctl_flags &= FS_FL_USER_VISIBLE;
 546
 547         error = copy_to_user(arg, &ioctl_flags, sizeof (ioctl_flags));
 548
 549         return (error);
 550 }
 551
 552 /*
 553  * fchange() is a helper macro to detect if we have been asked to change a
 554  * flag. This is ugly, but the requirement that we do this is a consequence of
 555  * how the Linux file attribute interface was designed. Another consequence is
 556  * that concurrent modification of files suffers from a TOCTOU race. Neither
 557  * are things we can fix without modifying the kernel-userland interface, which
 558  * is outside of our jurisdiction.
 559  */
 560
 561 #define fchange(f0, f1, b0, b1) ((((f0) & (b0)) == (b0)) != \
 562         (((b1) & (f1)) == (f1)))
 563
 564 static int
 565 zpl_ioctl_setflags(struct file *filp, void __user *arg)
 566 {
 567         struct inode    *ip = filp->f_dentry->d_inode;
 568         uint64_t        zfs_flags = ITOZ(ip)->z_pflags;
 569         unsigned int    ioctl_flags;
 570         cred_t          *cr = CRED();
 571         xvattr_t        xva;
 572         xoptattr_t      *xoap;
 573         int             error;
 574
 575         if (copy_from_user(&ioctl_flags, arg, sizeof (ioctl_flags)))
 576                 return (-EFAULT);
 577
 578         if ((ioctl_flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL)))
 579                 return (-EOPNOTSUPP);
 580
 581         if ((ioctl_flags & ~(FS_FL_USER_MODIFIABLE)))
 582                 return (-EACCES);
 583
 584         if ((fchange(ioctl_flags, zfs_flags, FS_IMMUTABLE_FL, ZFS_IMMUTABLE) ||
 585             fchange(ioctl_flags, zfs_flags, FS_APPEND_FL, ZFS_APPENDONLY)) &&
 586             !capable(CAP_LINUX_IMMUTABLE))
 587                 return (-EACCES);
 588
 589         if (!zpl_inode_owner_or_capable(ip))
 590                 return (-EACCES);
 591
 592         xva_init(&xva);
 593         xoap = xva_getxoptattr(&xva);
 594
 595         XVA_SET_REQ(&xva, XAT_IMMUTABLE);
 596         if (ioctl_flags & FS_IMMUTABLE_FL)
 597                 xoap->xoa_immutable = B_TRUE;
 598
 599         XVA_SET_REQ(&xva, XAT_APPENDONLY);
 600         if (ioctl_flags & FS_APPEND_FL)
 601                 xoap->xoa_appendonly = B_TRUE;
 602
 603         XVA_SET_REQ(&xva, XAT_NODUMP);
 604         if (ioctl_flags & FS_NODUMP_FL)
 605                 xoap->xoa_nodump = B_TRUE;
 606
 607         crhold(cr);
 608         error = -zfs_setattr(ip, (vattr_t *)&xva, 0, cr);
 609         crfree(cr);
 610
 611         return (error);
 612 }
 613
 614 static long
 615 zpl_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 616 {
 617         switch (cmd) {
 618         case FS_IOC_GETFLAGS:
 619                 return (zpl_ioctl_getflags(filp, (void *)arg));
 620         case FS_IOC_SETFLAGS:
 621                 return (zpl_ioctl_setflags(filp, (void *)arg));
 622         default:
 623                 return (-ENOTTY);
 624         }
 625 }
 626
 627 #ifdef CONFIG_COMPAT
 628 static long
 629 zpl_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 630 {
 631         return (zpl_ioctl(filp, cmd, arg));
 632 }
 633 #endif /* CONFIG_COMPAT */
 634
 635
 636 const struct address_space_operations zpl_address_space_operations = {
 637         .readpages      = zpl_readpages,
 638         .readpage       = zpl_readpage,
 639         .writepage      = zpl_writepage,
 640         .writepages     = zpl_writepages,
 641 };
 642
 643 const struct file_operations zpl_file_operations = {
 644         .open           = zpl_open,
 645         .release        = zpl_release,
 646         .llseek         = zpl_llseek,
 647         .read           = zpl_read,
 648         .write          = zpl_write,
 649         .mmap           = zpl_mmap,
 650         .fsync          = zpl_fsync,
 651 #ifdef HAVE_FILE_FALLOCATE
 652         .fallocate      = zpl_fallocate,
 653 #endif /* HAVE_FILE_FALLOCATE */
 654         .unlocked_ioctl = zpl_ioctl,
 655 #ifdef CONFIG_COMPAT
 656         .compat_ioctl   = zpl_compat_ioctl,
 657 #endif
 658 };
 659
 660 const struct file_operations zpl_dir_file_operations = {
 661         .llseek         = generic_file_llseek,
 662         .read           = generic_read_dir,
 663 #ifdef HAVE_VFS_ITERATE
 664         .iterate        = zpl_iterate,
 665 #else
 666         .readdir        = zpl_readdir,
 667 #endif
 668         .fsync          = zpl_fsync,
 669         .unlocked_ioctl = zpl_ioctl,
 670 #ifdef CONFIG_COMPAT
 671         .compat_ioctl   = zpl_compat_ioctl,
 672 #endif
 673 };