| blob | 25a526629b125163c772815025fec6be0d283657 |
1 /*
2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
74 /*
75 * The maximum pathlen is 1024 bytes. Since the minimum file system
76 * blocksize is 512 bytes, we can get a max of 2 extents back from
77 * bmapi.
78 */
79 #define SYMLINK_MAPS 2
81 /*
82 * For xfs, we check that the file isn't too big to be opened by this kernel.
83 * No other open action is required for regular files. Devices are handled
84 * through the specfs file system, pipes through fifofs. Device and
85 * fifo vnodes are "wrapped" by specfs and fifofs vnodes, respectively,
86 * when a new vnode is first looked up or created.
87 */
88 STATIC int
92 {
103 /*
104 * If it's a directory with any blocks, read-ahead block 0
105 * as we're almost certain to have the next operation be a read there.
106 */
112 }
114 }
117 /*
118 * xfs_getattr
119 */
120 STATIC int
126 {
150 #if XFS_BIG_INUMS
152 #endif
155 /*
156 * Quick exit for non-stat callers
157 */
163 /*
164 * Copy from in-core inode.
165 */
172 /*
173 * Check vnode type block/char vs. everything else.
174 * Do it with bitmask because that's faster than looking
175 * for multiple values individually.
176 */
182 #if 0
183 /* Large block sizes confuse various
184 * user space programs, so letting the
185 * stripe size through is not a good
186 * idea for now.
187 */
189 /*
190 * If the underlying volume is a stripe, then
191 * return the stripe width in bytes as the
192 * recommended I/O size.
193 */
195 /*
196 * Return the largest of the preferred buffer
197 * sizes since doing small I/Os into larger
198 * buffers causes buffers to be decommissioned.
199 * The value returned is in bytes.
200 */
204 #else
206 /*
207 * Return the largest of the preferred buffer
208 * sizes since doing small I/Os into larger
209 * buffers causes buffers to be decommissioned.
210 * The value returned is in bytes.
211 */
214 #endif
217 /*
218 * If the file blocks are being allocated from a
219 * realtime partition, then return the inode's
220 * realtime extent size or the realtime volume's
221 * extent size.
222 */
226 }
230 }
239 /*
240 * Exit for stat callers. See if any of the rest of the fields
241 * to be filled in are needed.
242 */
248 /*
249 * Convert di_flags to xflags.
250 */
253 /*
254 * Exit for inode revalidate. See if any of the rest of
255 * the fields to be filled in are needed.
256 */
272 else
276 all_done:
280 }
283 /*
284 * xfs_setattr
285 */
286 int
292 {
298 uint lock_flags;
316 /*
317 * Cannot set certain attributes.
318 */
322 }
330 /*
331 * Timestamps do not need to be logged and hence do not
332 * need to be done within a transaction.
333 */
341 }
346 /*
347 * If disk quotas is on, we make sure that the dquots do exist on disk,
348 * before we start any other transactions. Trying to do this later
349 * is messy. We don't care to take a readlock to look at the ids
350 * in inode here, because we can't hold it across the trans_reserve.
351 * If the IDs do change before we take the ilock, we're covered
352 * because the i_*dquot fields will get updated anyway.
353 */
362 }
368 }
369 /*
370 * We take a reference when we initialize udqp and gdqp,
371 * so it is important that we never blindly double trip on
372 * the same variable. See xfs_create() for an example.
373 */
379 }
381 /*
382 * For the other attributes, we acquire the inode lock and
383 * first do an error checking pass.
384 */
400 }
401 }
411 }
412 }
415 }
419 /* boolean: are we the file owner? */
422 /*
423 * Change various properties of a file.
424 * Only the owner or users with CAP_FOWNER
425 * capability may do these things.
426 */
430 /*
431 * CAP_FOWNER overrides the following restrictions:
432 *
433 * The user ID of the calling process must be equal
434 * to the file owner ID, except in cases where the
435 * CAP_FSETID capability is applicable.
436 */
440 }
442 /*
443 * CAP_FSETID overrides the following restrictions:
444 *
445 * The effective user ID of the calling process shall match
446 * the file owner when setting the set-user-ID and
447 * set-group-ID bits on that file.
448 *
449 * The effective group ID or one of the supplementary group
450 * IDs of the calling process shall match the group owner of
451 * the file when setting the set-group-ID bit on that file
452 */
461 #if 0
462 /* Linux allows this, Irix doesn't. */
465 #endif
468 }
469 }
471 /*
472 * Change file ownership. Must be the owner or privileged.
473 * If the system was configured with the "restricted_chown"
474 * option, the owner is not permitted to give away the file,
475 * and can change the group id only to a group of which he
476 * or she is a member.
477 */
479 /*
480 * These IDs could have changed since we last looked at them.
481 * But, we're assured that if the ownership did change
482 * while we didn't have the inode locked, inode's dquot(s)
483 * would have changed also.
484 */
491 iprojid;
493 /*
494 * CAP_CHOWN overrides the following restrictions:
495 *
496 * If _POSIX_CHOWN_RESTRICTED is defined, this capability
497 * shall override the restriction that a process cannot
498 * change the user ID of a file it owns and the restriction
499 * that the group ID supplied to the chown() function
500 * shall be equal to either the group ID or one of the
501 * supplementary group IDs of the calling process.
502 *
503 * XXX: How does restricted_chown affect projid?
504 */
511 }
512 /*
513 * Do a quota reservation only if uid or gid is actually
514 * going to change.
515 */
524 }
525 }
527 /*
528 * Truncate file. Must have write permission and not be a directory.
529 */
531 /* Short circuit the truncate case for zero length files */
540 }
548 }
549 /*
550 * Make sure that the dquots are attached to the inode.
551 */
554 }
556 /*
557 * Change file access or modified times.
558 */
565 }
566 }
567 }
569 /*
570 * Change extent size or realtime flag.
571 */
573 /*
574 * Can't change extent size if any extents are allocated.
575 */
582 }
584 /*
585 * Can't set extent size unless the file is marked, or
586 * about to be marked as a realtime file.
587 *
588 * This check will be removed when fixed size extents
589 * with buffered data writes is implemented.
590 *
591 */
600 }
602 /*
603 * Can't change realtime flag if any extents are allocated.
604 */
610 }
611 /*
612 * Extent size must be a multiple of the appropriate block
613 * size, if set at all.
614 */
616 xfs_extlen_t size;
625 }
629 }
630 }
631 /*
632 * If realtime flag is set then must have realtime data.
633 */
641 }
642 }
644 /*
645 * Can't modify an immutable/append-only file unless
646 * we have appropriate permission.
647 */
656 }
657 }
659 /*
660 * Now we can make the changes. Before we join the inode
661 * to the transaction, if XFS_AT_SIZE is set then take care of
662 * the part of the truncation that must be done without the
663 * inode lock. This needs to be done before joining the inode
664 * to the transaction, because the inode cannot be unlocked
665 * once it is a part of the transaction.
666 */
679 }
683 XFS_TRANS_PERM_LOG_RES,
684 XFS_ITRUNCATE_LOG_COUNT))) {
689 }
692 }
697 }
699 /* determine whether mandatory locking mode changes */
702 /*
703 * Truncate file. Must have write permission and not be a directory.
704 */
711 /*
712 * signal a sync transaction unless
713 * we're truncating an already unlinked
714 * file on a wsync filesystem
715 */
718 XFS_DATA_FORK,
724 }
725 }
726 /*
727 * Have to do this even if the file's size doesn't change.
728 */
730 }
732 /*
733 * Change file access modes.
734 */
741 }
743 /*
744 * Change file ownership. Must be the owner or privileged.
745 * If the system was configured with the "restricted_chown"
746 * option, the owner is not permitted to give away the file,
747 * and can change the group id only to a group of which he
748 * or she is a member.
749 */
751 /*
752 * CAP_FSETID overrides the following restrictions:
753 *
754 * The set-user-ID and set-group-ID bits of a file will be
755 * cleared upon successful return from chown()
756 */
760 }
762 /*
763 * Change the ownerships and register quota modifications
764 * in the transaction.
765 */
772 }
774 }
781 }
783 }
786 /*
787 * We may have to rev the inode as well as
788 * the superblock version number since projids didn't
789 * exist before DINODE_VERSION_2 and SB_VERSION_NLINK.
790 */
793 }
797 }
800 /*
801 * Change file access or modified times.
802 */
809 }
815 }
818 }
820 /*
821 * Change XFS-added attributes.
822 */
825 /*
826 * Converting bytes to fs blocks.
827 */
830 }
832 uint di_flags;
834 /* can't set PREALLOC this way, just preserve it */
857 }
858 }
860 }
863 }
865 /*
866 * Change file inode change time only if XFS_AT_CTIME set
867 * AND we have been called by a DMI function.
868 */
875 }
877 /*
878 * Send out timestamp changes that need to be set to the
879 * current time. Not done when called by a DMI function.
880 */
886 /*
887 * If this is a synchronous mount, make sure that the
888 * transaction goes to disk before returning to the user.
889 * This is slightly sub-optimal in that truncates require
890 * two sync transactions instead of one for wsync filesytems.
891 * One for the truncate and one for the timestamps since we
892 * don't want to change the timestamps unless we're sure the
893 * truncate worked. Truncates are less than 1% of the laddis
894 * mix so this probably isn't worth the trouble to optimize.
895 */
902 }
904 /*
905 * If the (regular) file's mandatory locking mode changed, then
906 * notify the vnode. We do this under the inode lock to prevent
907 * racing calls to vop_vnode_change.
908 */
912 mandlock_after);
913 }
917 /*
918 * Release any dquot(s) the inode had kept before chown.
919 */
927 }
934 }
937 abort_return:
939 /* FALLTHROUGH */
940 error_return:
945 }
948 }
950 }
953 /*
954 * xfs_access
955 * Null conversion from vnode mode bits to inode mode bits, as in efs.
956 */
957 STATIC int
962 {
974 }
977 /*
978 * xfs_readlink
979 *
980 */
981 STATIC int
987 {
990 xfs_off_t offset;
997 xfs_daddr_t d;
1021 }
1025 }
1029 }
1031 /*
1032 * See if the symlink is stored inline.
1033 */
1038 }
1040 /*
1041 * Symlink not inline. Call bmap to get it in.
1042 */
1050 }
1063 }
1070 }
1072 }
1075 error_return:
1080 }
1083 /*
1084 * xfs_fsync
1085 *
1086 * This is called to sync the inode and its data out to disk.
1087 * We need to hold the I/O lock while flushing the data, and
1088 * the inode lock while flushing the inode. The inode lock CANNOT
1089 * be held while flushing the data, so acquire after we're done
1090 * with that.
1091 */
1092 STATIC int
1097 xfs_off_t start,
1098 xfs_off_t stop)
1099 {
1114 /*
1115 * We always need to make sure that the required inode state
1116 * is safe on disk. The vnode might be clean but because
1117 * of committed transactions that haven't hit the disk yet.
1118 * Likewise, there could be unflushed non-transactional
1119 * changes to the inode core that have to go to disk.
1120 *
1121 * The following code depends on one assumption: that
1122 * any transaction that changes an inode logs the core
1123 * because it has to change some field in the inode core
1124 * (typically nextents or nblocks). That assumption
1125 * implies that any transactions against an inode will
1126 * catch any non-transactional updates. If inode-altering
1127 * transactions exist that violate this assumption, the
1128 * code breaks. Right now, it figures that if the involved
1129 * update_* field is clear and the inode is unpinned, the
1130 * inode is clean. Either it's been flushed or it's been
1131 * committed and the commit has hit the disk unpinning the inode.
1132 * (Note that xfs_inode_item_format() called at commit clears
1133 * the update_* fields.)
1134 */
1137 /* If we are flushing data then we care about update_size
1138 * being set, otherwise we care about update_core
1139 */
1143 /*
1144 * Timestamps/size haven't changed since last inode
1145 * flush or inode transaction commit. That means
1146 * either nothing got written or a transaction
1147 * committed which caught the updates. If the
1148 * latter happened and the transaction hasn't
1149 * hit the disk yet, the inode will be still
1150 * be pinned. If it is, force the log.
1151 */
1157 XFS_LOG_FORCE |
1160 }
1163 /*
1164 * Kick off a transaction to log the inode
1165 * core to get the updates. Make it
1166 * sync if FSYNC_WAIT is passed in (which
1167 * is done by everybody but specfs). The
1168 * sync transaction will also force the log.
1169 */
1177 }
1180 /*
1181 * Note - it's possible that we might have pushed
1182 * ourselves out of the way during trans_reserve
1183 * which would flush the inode. But there's no
1184 * guarantee that the inode buffer has actually
1185 * gone out yet (it's delwri). Plus the buffer
1186 * could be pinned anyway if it's part of an
1187 * inode in another recent transaction. So we
1188 * play it safe and fire off the transaction anyway.
1189 */
1198 }
1200 }
1202 /*
1203 * This is called by xfs_inactive to free any blocks beyond eof,
1204 * when the link count isn't zero.
1205 */
1206 STATIC int
1210 {
1213 xfs_fileoff_t end_fsb;
1214 xfs_fileoff_t last_fsb;
1215 xfs_filblks_t map_len;
1217 xfs_bmbt_irec_t imap;
1219 /*
1220 * Figure out if there are any blocks beyond the end
1221 * of the file. If not, then there is nothing to do.
1222 */
1237 /*
1238 * Attach the dquots to the inode up front.
1239 */
1243 /*
1244 * There are blocks after the end of file.
1245 * Free them up now by truncating the file to
1246 * its current size.
1247 */
1250 /*
1251 * Do the xfs_itruncate_start() call before
1252 * reserving any log space because
1253 * itruncate_start will call into the buffer
1254 * cache and we can't
1255 * do that within a transaction.
1256 */
1264 XFS_ITRUNCATE_LOG_COUNT);
1270 }
1274 XFS_IOLOCK_EXCL |
1275 XFS_ILOCK_EXCL);
1280 XFS_DATA_FORK,
1282 /*
1283 * If we get an error at this point we
1284 * simply don't bother truncating the file.
1285 */
1289 XFS_TRANS_ABORT));
1292 XFS_TRANS_RELEASE_LOG_RES,
1293 NULL);
1294 }
1296 }
1298 }
1300 /*
1301 * Free a symlink that has blocks associated with it.
1302 */
1303 STATIC int
1307 {
1312 xfs_fsblock_t first_block;
1313 xfs_bmap_free_t free_list;
1325 /*
1326 * We're freeing a symlink that has some
1327 * blocks allocated to it. Free the
1328 * blocks here. We know that we've got
1329 * either 1 or 2 extents and that we can
1330 * free them all in one bunmapi call.
1331 */
1339 }
1340 /*
1341 * Lock the inode, fix the size, and join it to the transaction.
1342 * Hold it so in the normal path, we still have it locked for
1343 * the second transaction. In the error paths we need it
1344 * held so the cancel won't rele it, see below.
1345 */
1352 /*
1353 * Find the block(s) so we can inval and unmap them.
1354 */
1362 /*
1363 * Invalidate the block(s).
1364 */
1370 }
1371 /*
1372 * Unmap the dead block(s) to the free_list.
1373 */
1378 /*
1379 * Commit the first transaction. This logs the EFI and the inode.
1380 */
1383 /*
1384 * The transaction must have been committed, since there were
1385 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
1386 * The new tp has the extent freeing and EFDs.
1387 */
1389 /*
1390 * The first xact was committed, so add the inode to the new one.
1391 * Mark it dirty so it will be logged and moved forward in the log as
1392 * part of every commit.
1393 */
1397 /*
1398 * Get a new, empty transaction to return to our caller.
1399 */
1401 /*
1402 * Commit the transaction containing extent freeing and EFD's.
1403 * If we get an error on the commit here or on the reserve below,
1404 * we need to unlock the inode since the new transaction doesn't
1405 * have the inode attached.
1406 */
1412 }
1413 /*
1414 * Remove the memory for extent descriptions (just bookkeeping).
1415 */
1419 /*
1420 * Put an itruncate log reservation in the new transaction
1421 * for our caller.
1422 */
1427 }
1428 /*
1429 * Return with the inode locked but not joined to the transaction.
1430 */
1434 error1:
1436 error0:
1437 /*
1438 * Have to come here with the inode locked and either
1439 * (held and in the transaction) or (not in the transaction).
1440 * If the inode isn't held then cancel would iput it, but
1441 * that's wrong since this is inactive and the vnode ref
1442 * count is 0 already.
1443 * Cancel won't do anything to the inode if held, but it still
1444 * needs to be locked until the cancel is done, if it was
1445 * joined to the transaction.
1446 */
1452 }
1454 STATIC int
1458 {
1462 /*
1463 * We're freeing a symlink which fit into
1464 * the inode. Just free the memory used
1465 * to hold the old symlink.
1466 */
1470 XFS_ITRUNCATE_LOG_COUNT);
1476 }
1479 /*
1480 * Zero length symlinks _can_ exist.
1481 */
1485 XFS_DATA_FORK);
1487 }
1489 }
1491 /*
1492 *
1493 */
1494 STATIC int
1498 {
1515 }
1521 XFS_INACTIVE_LOG_COUNT);
1528 }
1539 }
1541 STATIC int
1544 {
1555 }
1557 /* If this is a read-only mount, don't do this (would generate I/O) */
1561 #ifdef HAVE_REFCACHE
1562 /* If we are in the NFS reference cache then don't do this now */
1565 #endif
1576 /* Update linux inode block count after free above */
1579 }
1580 }
1583 }
1585 /*
1586 * xfs_inactive
1587 *
1588 * This is called when the vnode reference count for the vnode
1589 * goes to zero. If the file has been unlinked, then it must
1590 * now be truncated. Also, we clear all of the read-ahead state
1591 * kept for the inode here since the file is now closed.
1592 */
1593 STATIC int
1597 {
1600 xfs_bmap_free_t free_list;
1601 xfs_fsblock_t first_block;
1613 /*
1614 * If the inode is already free, then there can be nothing
1615 * to clean up here.
1616 */
1621 }
1623 /*
1624 * Only do a truncate if it's a regular file with
1625 * some actual space in it. It's OK to look at the
1626 * inode's fields without the lock because we're the
1627 * only one with a reference to the inode.
1628 */
1638 }
1642 /* If this is a read-only mount, don't do this (would generate I/O) */
1654 /* Update linux inode block count after free above */
1657 }
1659 }
1668 /*
1669 * Do the xfs_itruncate_start() call before
1670 * reserving any log space because itruncate_start
1671 * will call into the buffer cache and we can't
1672 * do that within a transaction.
1673 */
1681 XFS_ITRUNCATE_LOG_COUNT);
1683 /* Don't call itruncate_cleanup */
1688 }
1694 /*
1695 * normally, we have to run xfs_itruncate_finish sync.
1696 * But if filesystem is wsync and we're in the inactive
1697 * path, then we know that nlink == 0, and that the
1698 * xaction that made nlink == 0 is permanently committed
1699 * since xfs_remove runs as a synchronous transaction.
1700 */
1709 }
1712 /*
1713 * If we get an error while cleaning up a
1714 * symlink we bail out.
1715 */
1723 }
1731 XFS_INACTIVE_LOG_COUNT);
1736 }
1741 }
1743 /*
1744 * If there are attributes associated with the file
1745 * then blow them away now. The code calls a routine
1746 * that recursively deconstructs the attribute fork.
1747 * We need to just commit the current transaction
1748 * because we can't use it for xfs_attr_inactive().
1749 */
1752 /*
1753 * If we got an error, the transaction is already
1754 * cancelled, and the inode is unlocked. Just get out.
1755 */
1760 }
1762 /*
1763 * Free the inode.
1764 */
1768 /*
1769 * If we fail to free the inode, shut down. The cancel
1770 * might do that, we need to make sure. Otherwise the
1771 * inode might be lost for a long time or forever.
1772 */
1778 }
1781 /*
1782 * Credit the quota account(s). The inode is gone.
1783 */
1786 /*
1787 * Just ignore errors at this point. There is
1788 * nothing we can do except to try to keep going.
1789 */
1793 }
1794 /*
1795 * Release the dquots held by inode, if any.
1796 */
1801 out:
1803 }
1806 /*
1807 * xfs_lookup
1808 */
1809 STATIC int
1817 {
1819 xfs_ino_t e_inum;
1821 uint lock_mode;
1837 }
1840 }
1843 /*
1844 * xfs_create (create a new file).
1845 */
1846 STATIC int
1853 {
1860 xfs_dev_t rdev;
1862 xfs_bmap_free_t free_list;
1863 xfs_fsblock_t first_block;
1864 boolean_t dp_joined_to_trans;
1866 uint cancel_flags;
1868 xfs_prid_t prid;
1870 uint resblks;
1893 }
1898 /* Return through std_return after this point. */
1903 else
1906 /*
1907 * Make sure that we have allocated dquot(s) on disk.
1908 */
1921 /*
1922 * Initially assume that the file does not exist and
1923 * reserve the resources for that case. If that is not
1924 * the case we'll drop the one we have and get a more
1925 * appropriate transaction later.
1926 */
1933 }
1938 }
1946 /*
1947 * Reserve disk quota and the inode.
1948 */
1965 }
1968 /*
1969 * At this point, we've gotten a newly allocated inode.
1970 * It is locked (and joined to the transaction).
1971 */
1975 /*
1976 * Now we join the directory inode to the transaction.
1977 * We do not do it earlier because xfs_dir_ialloc
1978 * might commit the previous transaction (and release
1979 * all the locks).
1980 */
1992 }
1996 /*
1997 * If this is a synchronous mount, make sure that the
1998 * create transaction goes to disk before returning to
1999 * the user.
2000 */
2003 }
2007 /*
2008 * Attach the dquot(s) to the inodes and modify them incore.
2009 * These ids of the inode couldn't have changed since the new
2010 * inode has been locked ever since it was created.
2011 */
2014 /*
2015 * xfs_trans_commit normally decrements the vnode ref count
2016 * when it unlocks the inode. Since we want to return the
2017 * vnode to the caller, we bump the vnode ref count now.
2018 */
2026 }
2033 }
2038 /*
2039 * Propogate the fact that the vnode changed after the
2040 * xfs_inode locks have been released.
2041 */
2046 /* Fallthrough to std_return with error = 0 */
2048 std_return:
2051 DM_EVENT_POSTCREATE)) {
2057 }
2060 abort_return:
2062 /* FALLTHROUGH */
2063 error_return:
2075 abort_rele:
2076 /*
2077 * Wait until after the current transaction is aborted to
2078 * release the inode. This prevents recursive transactions
2079 * and deadlocks from xfs_inactive.
2080 */
2089 }
2091 #ifdef DEBUG
2092 /*
2093 * Some counters to see if (and how often) we are hitting some deadlock
2094 * prevention code paths.
2095 */
2100 #endif
2102 /*
2103 * The following routine will lock the inodes associated with the
2104 * directory and the named entry in the directory. The locks are
2105 * acquired in increasing inode number.
2106 *
2107 * If the entry is "..", then only the directory is locked. The
2108 * vnode ref count will still include that from the .. entry in
2109 * this case.
2110 *
2111 * There is a deadlock we need to worry about. If the locked directory is
2112 * in the AIL, it might be blocking up the log. The next inode we lock
2113 * could be already locked by another thread waiting for log space (e.g
2114 * a permanent log reservation with a long running transaction (see
2115 * xfs_itruncate_finish)). To solve this, we must check if the directory
2116 * is in the ail and use lock_nowait. If we can't lock, we need to
2117 * drop the inode lock on the directory and try again. xfs_iunlock will
2118 * potentially push the tail if we were holding up the log.
2119 */
2120 STATIC int
2125 {
2127 xfs_ino_t e_inum;
2131 #ifdef DEBUG
2132 xfs_rm_locks++;
2133 #endif
2136 again:
2143 /*
2144 * We want to lock in increasing inum. Since we've already
2145 * acquired the lock on the directory, we may need to release
2146 * if if the inum of the entry turns out to be less.
2147 */
2149 /*
2150 * We are already in the right order, so just
2151 * lock on the inode of the entry.
2152 * We need to use nowait if dp is in the AIL.
2153 */
2158 attempts++;
2159 #ifdef DEBUG
2160 xfs_rm_attempts++;
2161 #endif
2163 /*
2164 * Unlock dp and try again.
2165 * xfs_iunlock will try to push the tail
2166 * if the inode is in the AIL.
2167 */
2173 #ifdef DEBUG
2174 xfs_rm_lock_delays++;
2175 #endif
2176 }
2178 }
2181 }
2188 }
2189 /* else e_inum == dp->i_ino */
2190 /* This can happen if we're asked to lock /x/..
2191 * the entry is "..", which is also the parent directory.
2192 */
2195 }
2197 #ifdef DEBUG
2203 #endif
2205 /*
2206 * The following routine will lock n inodes in exclusive mode.
2207 * We assume the caller calls us with the inodes in i_ino order.
2208 *
2209 * We need to detect deadlock where an inode that we lock
2210 * is in the AIL and we start waiting for another inode that is locked
2211 * by a thread in a long running transaction (such as truncate). This can
2212 * result in deadlock since the long running trans might need to wait
2213 * for the inode we just locked in order to push the tail and free space
2214 * in the log.
2215 */
2216 void
2221 uint lock_mode)
2222 {
2234 }
2236 again:
2243 /*
2244 * If try_lock is not set yet, make sure all locked inodes
2245 * are not in the AIL.
2246 * If any are, set try_lock to be used later.
2247 */
2253 try_lock++;
2254 }
2255 }
2256 }
2258 /*
2259 * If any of the previous locks we have locked is in the AIL,
2260 * we must TRY to get the second and subsequent locks. If
2261 * we can't get any, we must release all we have
2262 * and try again.
2263 */
2266 /* try_lock must be 0 if i is 0. */
2267 /*
2268 * try_lock means we have an inode locked
2269 * that is in the AIL.
2270 */
2273 attempts++;
2275 /*
2276 * Unlock all previous guys and try again.
2277 * xfs_iunlock will try to push the tail
2278 * if the inode is in the AIL.
2279 */
2283 /*
2284 * Check to see if we've already
2285 * unlocked this one.
2286 * Not the first one going back,
2287 * and the inode ptr is the same.
2288 */
2294 }
2298 #ifdef DEBUG
2299 xfs_lock_delays++;
2300 #endif
2301 }
2305 }
2308 }
2309 }
2311 #ifdef DEBUG
2317 xfs_locked_n++;
2318 }
2319 #endif
2320 }
2322 #ifdef DEBUG
2323 #define REMOVE_DEBUG_TRACE(x) {remove_which_error_return = (x);}
2326 #define REMOVE_DEBUG_TRACE(x)
2330 /*
2331 * xfs_remove
2332 *
2333 */
2334 STATIC int
2339 {
2346 xfs_bmap_free_t free_list;
2347 xfs_fsblock_t first_block;
2352 uint resblks;
2372 }
2374 /* From this point on, return through std_return */
2377 /*
2378 * We need to get a reference to ip before we get our log
2379 * reservation. The reason for this is that we cannot call
2380 * xfs_iget for an inode for which we do not have a reference
2381 * once we've acquired a log reservation. This is because the
2382 * inode we are trying to get might be in xfs_inactive going
2383 * for a log reservation. Since we'll have to wait for the
2384 * inactive code to complete before returning from xfs_iget,
2385 * we need to make sure that we don't have log space reserved
2386 * when we call xfs_iget. Instead we get an unlocked referece
2387 * to the inode before getting our log reservation.
2388 */
2393 }
2408 }
2412 /*
2413 * We try to get the real space reservation first,
2414 * allowing for directory btree deletion(s) implying
2415 * possible bmap insert(s). If we can't get the space
2416 * reservation then we use 0 instead, and avoid the bmap
2417 * btree insert(s) in the directory code by, if the bmap
2418 * insert tries to happen, instead trimming the LAST
2419 * block from the directory.
2420 */
2428 }
2435 }
2443 }
2445 /*
2446 * At this point, we've gotten both the directory and the entry
2447 * inodes locked.
2448 */
2451 /*
2452 * Increment vnode ref count only in this case since
2453 * there's an extra vnode reference in the case where
2454 * dp == ip.
2455 */
2458 }
2460 /*
2461 * Entry must exist since we did a lookup in xfs_lock_dir_and_entry.
2462 */
2470 }
2480 }
2482 /* Determine if this is the last link while
2483 * we are in the transaction.
2484 */
2487 /*
2488 * Take an extra ref on the inode so that it doesn't
2489 * go to xfs_inactive() from within the commit.
2490 */
2493 /*
2494 * If this is a synchronous mount, make sure that the
2495 * remove transaction goes to disk before returning to
2496 * the user.
2497 */
2500 }
2506 }
2512 }
2514 /*
2515 * Before we drop our extra reference to the inode, purge it
2516 * from the refcache if it is there. By waiting until afterwards
2517 * to do the IRELE, we ensure that we won't go inactive in the
2518 * xfs_refcache_purge_ip routine (although that would be OK).
2519 */
2524 /*
2525 * Let interposed file systems know about removed links.
2526 */
2531 /* Fall through to std_return with error = 0 */
2532 std_return:
2534 DM_EVENT_POSTREMOVE)) {
2539 }
2542 error1:
2548 error_rele:
2549 /*
2550 * In this case make sure to not release the inode until after
2551 * the current transaction is aborted. Releasing it beforehand
2552 * can cause us to go to xfs_inactive and start a recursive
2553 * transaction which can easily deadlock with the current one.
2554 */
2559 /*
2560 * Before we drop our extra reference to the inode, purge it
2561 * from the refcache if it is there. By waiting until afterwards
2562 * to do the IRELE, we ensure that we won't go inactive in the
2563 * xfs_refcache_purge_ip routine (although that would be OK).
2564 */
2570 }
2573 /*
2574 * xfs_link
2575 *
2576 */
2577 STATIC int
2583 {
2589 xfs_bmap_free_t free_list;
2590 xfs_fsblock_t first_block;
2607 /*
2608 * For now, manually find the XFS behavior descriptor for
2609 * the source vnode. If it doesn't exist then something
2610 * is wrong and we should just return an error.
2611 * Eventually we need to figure out how link is going to
2612 * work in the face of stacked vnodes.
2613 */
2617 }
2631 }
2633 /* Return through std_return after this point. */
2650 }
2654 }
2662 }
2666 /*
2667 * Increment vnode ref counts since xfs_trans_commit &
2668 * xfs_trans_cancel will both unlock the inodes and
2669 * decrement the associated ref counts.
2670 */
2676 /*
2677 * If the source has too many links, we can't make any more to it.
2678 */
2682 }
2686 target_namelen)))
2693 resblks);
2703 }
2705 /*
2706 * If this is a synchronous mount, make sure that the
2707 * link transaction goes to disk before returning to
2708 * the user.
2709 */
2712 }
2718 }
2723 }
2725 /* Fall through to std_return with error = 0. */
2726 std_return:
2728 DM_EVENT_POSTLINK)) {
2733 }
2736 abort_return:
2738 /* FALLTHROUGH */
2739 error_return:
2743 }
2744 /*
2745 * xfs_mkdir
2746 *
2747 */
2748 STATIC int
2755 {
2765 xfs_bmap_free_t free_list;
2766 xfs_fsblock_t first_block;
2768 boolean_t dp_joined_to_trans;
2771 xfs_prid_t prid;
2773 uint resblks;
2798 }
2800 /* Return through std_return after this point. */
2808 else
2811 /*
2812 * Make sure that we have allocated dquot(s) on disk.
2813 */
2828 XFS_TRANS_PERM_LOG_RES,
2829 XFS_MKDIR_LOG_COUNT);
2830 }
2835 }
2839 /*
2840 * Check for directory link count overflow.
2841 */
2845 }
2847 /*
2848 * Reserve disk quota and the inode.
2849 */
2857 /*
2858 * create the directory inode.
2859 */
2868 }
2871 /*
2872 * Now we add the directory inode to the transaction.
2873 * We waited until now since xfs_dir_ialloc might start
2874 * a new transaction. Had we joined the transaction
2875 * earlier, the locks might have gotten released.
2876 */
2889 }
2892 /*
2893 * Bump the in memory version number of the parent directory
2894 * so that other processes accessing it will recognize that
2895 * the directory has changed.
2896 */
2902 }
2908 }
2917 /*
2918 * Attach the dquots to the new inode and modify the icount incore.
2919 */
2922 /*
2923 * If this is a synchronous mount, make sure that the
2924 * mkdir transaction goes to disk before returning to
2925 * the user.
2926 */
2929 }
2935 }
2942 }
2944 /* Fall through to std_return with error = 0 or errno from
2945 * xfs_trans_commit. */
2947 std_return:
2950 DM_EVENT_POSTCREATE)) {
2954 DM_RIGHT_NULL,
2957 }
2960 error2:
2961 error1:
2963 abort_return:
2965 error_return:
2972 }
2975 }
2978 /*
2979 * xfs_rmdir
2980 *
2981 */
2982 STATIC int
2987 {
2994 xfs_bmap_free_t free_list;
2995 xfs_fsblock_t first_block;
3002 uint resblks;
3021 }
3023 /* Return through std_return after this point. */
3027 /*
3028 * We need to get a reference to cdp before we get our log
3029 * reservation. The reason for this is that we cannot call
3030 * xfs_iget for an inode for which we do not have a reference
3031 * once we've acquired a log reservation. This is because the
3032 * inode we are trying to get might be in xfs_inactive going
3033 * for a log reservation. Since we'll have to wait for the
3034 * inactive code to complete before returning from xfs_iget,
3035 * we need to make sure that we don't have log space reserved
3036 * when we call xfs_iget. Instead we get an unlocked referece
3037 * to the inode before getting our log reservation.
3038 */
3043 }
3047 /*
3048 * Get the dquots for the inodes.
3049 */
3057 }
3061 /*
3062 * We try to get the real space reservation first,
3063 * allowing for directory btree deletion(s) implying
3064 * possible bmap insert(s). If we can't get the space
3065 * reservation then we use 0 instead, and avoid the bmap
3066 * btree insert(s) in the directory code by, if the bmap
3067 * insert tries to happen, instead trimming the LAST
3068 * block from the directory.
3069 */
3077 }
3083 }
3086 /*
3087 * Now lock the child directory inode and the parent directory
3088 * inode in the proper order. This will take care of validating
3089 * that the directory entry for the child directory inode has
3090 * not changed while we were obtaining a log reservation.
3091 */
3097 }
3101 /*
3102 * Only increment the parent directory vnode count if
3103 * we didn't bump it in looking up cdp. The only time
3104 * we don't bump it is when we're looking up ".".
3105 */
3107 }
3116 }
3120 }
3126 }
3130 /*
3131 * Bump the in memory generation count on the parent
3132 * directory so that other can know that it has changed.
3133 */
3136 /*
3137 * Drop the link from cdp's "..".
3138 */
3142 }
3144 /*
3145 * Drop the link from dp to cdp.
3146 */
3150 }
3152 /*
3153 * Drop the "." link from cdp to self.
3154 */
3158 }
3160 /* Determine these before committing transaction */
3163 /*
3164 * Take an extra ref on the child vnode so that it
3165 * does not go to xfs_inactive() from within the commit.
3166 */
3169 /*
3170 * If this is a synchronous mount, make sure that the
3171 * rmdir transaction goes to disk before returning to
3172 * the user.
3173 */
3176 }
3182 XFS_TRANS_ABORT));
3185 }
3191 }
3194 /*
3195 * Let interposed file systems know about removed links.
3196 */
3201 /* Fall through to std_return with error = 0 or the errno
3202 * from xfs_trans_commit. */
3203 std_return:
3210 }
3213 error1:
3216 error_return:
3219 }
3222 /*
3223 * xfs_readdir
3224 *
3225 * Read dp's entries starting at uiop->uio_offset and translate them into
3226 * bufsize bytes worth of struct dirents starting at bufbase.
3227 */
3228 STATIC int
3234 {
3238 uint lock_mode;
3239 xfs_off_t start_offset;
3247 }
3254 }
3257 }
3260 /*
3261 * xfs_symlink
3262 *
3263 */
3264 STATIC int
3272 {
3279 xfs_bmap_free_t free_list;
3280 xfs_fsblock_t first_block;
3281 boolean_t dp_joined_to_trans;
3283 uint cancel_flags;
3285 xfs_fileoff_t first_fsb;
3286 xfs_filblks_t fs_blocks;
3289 xfs_daddr_t d;
3294 xfs_prid_t prid;
3296 uint resblks;
3317 /*
3318 * Check component lengths of the target path name.
3319 */
3328 /*
3329 * Skip any slashes.
3330 */
3332 total++;
3333 path++;
3334 }
3336 /*
3337 * Count up to the next slash or end of path.
3338 * Error out if the component is bigger than MAXNAMELEN.
3339 */
3344 }
3345 }
3346 }
3347 }
3355 }
3357 /* Return through std_return after this point. */
3362 else
3365 /*
3366 * Make sure that we have allocated dquot(s) on disk.
3367 */
3376 /*
3377 * The symlink will fit into the inode data fork?
3378 * There can't be any attributes so we get the whole variable part.
3379 */
3382 else
3391 }
3396 }
3400 /*
3401 * Check whether the directory allows new symlinks or not.
3402 */
3406 }
3408 /*
3409 * Reserve disk quota : blocks and inode.
3410 */
3415 /*
3416 * Check for ability to enter directory entry, if no space reserved.
3417 */
3421 /*
3422 * Initialize the bmap freelist prior to calling either
3423 * bmapi or the directory create code.
3424 */
3427 /*
3428 * Allocate an inode for the symlink.
3429 */
3436 }
3443 /*
3444 * Also attach the dquot(s) to it, if applicable.
3445 */
3450 /*
3451 * If the symlink will fit into the inode, write it inline.
3452 */
3458 /*
3459 * The inode was initially created in extent format.
3460 */
3477 }
3493 }
3500 }
3501 }
3503 /*
3504 * Create the directory entry for the symlink.
3505 */
3510 }
3514 /*
3515 * Bump the in memory version number of the parent directory
3516 * so that other processes accessing it will recognize that
3517 * the directory has changed.
3518 */
3521 /*
3522 * If this is a synchronous mount, make sure that the
3523 * symlink transaction goes to disk before returning to
3524 * the user.
3525 */
3528 }
3530 /*
3531 * xfs_trans_commit normally decrements the vnode ref count
3532 * when it unlocks the inode. Since we want to return the
3533 * vnode to the caller, we bump the vnode ref count now.
3534 */
3540 }
3545 /* Fall through to std_return with error = 0 or errno from
3546 * xfs_trans_commit */
3547 std_return:
3549 DM_EVENT_POSTSYMLINK)) {
3555 }
3563 }
3566 error2:
3568 error1:
3571 error_return:
3578 }
3581 }
3584 /*
3585 * xfs_fid2
3586 *
3587 * A fid routine that takes a pointer to a previously allocated
3588 * fid structure (like xfs_fast_fid) but uses a 64 bit inode number.
3589 */
3590 STATIC int
3594 {
3606 /*
3607 * use memcpy because the inode is a long long and there's no
3608 * assurance that xfid->fid_ino is properly aligned.
3609 */
3614 }
3617 /*
3618 * xfs_rwlock
3619 */
3620 int
3623 vrwlock_t locktype)
3624 {
3642 }
3645 }
3648 /*
3649 * xfs_rwunlock
3650 */
3651 void
3654 vrwlock_t locktype)
3655 {
3664 /*
3665 * In the write case, we may have added a new entry to
3666 * the reference cache. This might store a pointer to
3667 * an inode to be released in this inode. If it is there,
3668 * clear the pointer and release the inode after unlocking
3669 * this one.
3670 */
3676 }
3678 }
3680 STATIC int
3684 {
3697 /*
3698 * Bypass inodes which have already been cleaned by
3699 * the inode flush clustering code inside xfs_iflush
3700 */
3708 xfs_lsn_t sync_lsn;
3721 }
3722 }
3724 /*
3725 * We make this non-blocking if the inode is contended,
3726 * return EAGAIN to indicate to the caller that they
3727 * did not succeed. This prevents the flush path from
3728 * blocking on inodes inside another operation right
3729 * now, they get caught later by xfs_sync.
3730 */
3744 }
3747 }
3751 else
3756 }
3759 }
3762 int
3765 u_int evmask,
3766 u_int16_t state,
3768 {
3788 }
3800 }
3803 /*
3804 * xfs_reclaim
3805 */
3806 STATIC int
3809 {
3820 /* bad inode, get out here ASAP */
3824 }
3828 /*
3829 * Flush and invalidate any data left around that is
3830 * a part of this file.
3831 *
3832 * Get the inode's i/o lock so that buffers are pushed
3833 * out while holding the proper lock. We can't hold
3834 * the inode lock here since flushing out buffers may
3835 * cause us to try to get the lock in xfs_strategy().
3836 *
3837 * We don't have to call remapf() here, because there
3838 * cannot be any mapped file references to this vnode
3839 * since it is being reclaimed.
3840 */
3843 /*
3844 * If we hit an IO error, we need to make sure that the
3845 * buffer and page caches of file data for
3846 * the file are tossed away. We don't want to use
3847 * VOP_FLUSHINVAL_PAGES here because we don't want dirty
3848 * pages to stay attached to the vnode, but be
3849 * marked P_BAD. pdflush/vnode_pagebad
3850 * hates that.
3851 */
3856 }
3863 /*
3864 * di_size field may not be quite accurate if we're
3865 * shutting down.
3866 */
3869 }
3870 }
3872 /* If we have nothing to flush with this inode then complete the
3873 * teardown now, otherwise break the link between the xfs inode
3874 * and the linux inode and clean up the xfs inode later. This
3875 * avoids flushing the inode to disk during the delete operation
3876 * itself.
3877 */
3885 /* Protect sync from us */
3891 }
3893 }
3895 int
3900 {
3908 /* The hash lock here protects a thread in xfs_iget_core from
3909 * racing with us on linking the inode back with a vnode.
3910 * Once we have the XFS_IRECLAIM flag set it will not touch
3911 * us.
3912 */
3920 }
3922 }
3926 /*
3927 * If the inode is still dirty, then flush it out. If the inode
3928 * is not in the AIL, then it will be OK to flush it delwri as
3929 * long as xfs_iflush() does not keep any references to the inode.
3930 * We leave that decision up to xfs_iflush() since it has the
3931 * knowledge of whether it's OK to simply do a delwri flush of
3932 * the inode or whether we need to wait until the inode is
3933 * pulled from the AIL.
3934 * We get the flush lock regardless, though, just to make sure
3935 * we don't free it while it is being flushed.
3936 */
3941 }
3947 /*
3948 * If we hit an error, typically because of filesystem
3949 * shutdown, we don't need to let vn_reclaim to know
3950 * because we're gonna reclaim the inode anyway.
3951 */
3955 }
3957 }
3964 /*
3965 * We are not interested in doing an iflush if we're
3966 * in the process of shutting down the filesystem forcibly.
3967 * So, just reclaim the inode.
3968 */
3971 }
3973 reclaim:
3976 }
3978 int
3980 {
3996 }
3997 }
4000 XFS_IFLUSH_DELWRI_ELSE_ASYNC);
4003 }
4006 }
4010 }
4012 /*
4013 * xfs_alloc_file_space()
4014 * This routine allocates disk space for the given file.
4015 *
4016 * If alloc_type == 0, this request is for an ALLOCSP type
4017 * request which will change the file size. In this case, no
4018 * DMAPI event will be generated by the call. A TRUNCATE event
4019 * will be generated later by xfs_setattr.
4020 *
4021 * If alloc_type != 0, this request is for a RESVSP type
4022 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
4023 * lower block boundary byte address is less than the file's
4024 * length.
4025 *
4026 * RETURNS:
4027 * 0 on success
4028 * errno on error
4029 *
4030 */
4031 int
4034 xfs_off_t offset,
4035 xfs_off_t len,
4038 {
4039 xfs_filblks_t allocated_fsb;
4040 xfs_filblks_t allocatesize_fsb;
4042 xfs_off_t count;
4043 xfs_filblks_t datablocks;
4045 xfs_fsblock_t firstfsb;
4046 xfs_bmap_free_t free_list;
4052 uint resblks;
4055 xfs_fileoff_t startoffset_fsb;
4065 /*
4066 * determine if this is a realtime file
4067 */
4071 else
4090 /* Generate a DMAPI event if needed. */
4094 xfs_off_t end_dmi_offset;
4104 }
4106 /*
4107 * allocate file space until done or until there is an error
4108 */
4109 retry:
4111 /*
4112 * determine if reserving space on
4113 * the data or realtime partition.
4114 */
4122 rtextsize);
4128 }
4130 /*
4131 * allocate and setup the transaction
4132 */
4136 resblks,
4138 numrtextents,
4139 XFS_TRANS_PERM_LOG_RES,
4140 XFS_WRITE_LOG_COUNT);
4142 /*
4143 * check for running out of space
4144 */
4146 /*
4147 * Free the transaction structure.
4148 */
4152 }
4163 /*
4164 * issue the bmapi() call to allocate the blocks
4165 */
4173 }
4175 /*
4176 * complete the transaction
4177 */
4181 }
4187 }
4194 }
4198 }
4199 dmapi_enospc_check:
4209 /* else fall through with error from XFS_SEND_DATA */
4210 }
4214 error0:
4216 error1:
4220 }
4222 /*
4223 * Zero file bytes between startoff and endoff inclusive.
4224 * The iolock is held exclusive and no blocks are buffered.
4225 */
4226 STATIC int
4229 xfs_off_t startoff,
4230 xfs_off_t endoff)
4231 {
4232 xfs_bmbt_irec_t imap;
4233 xfs_fileoff_t offset_fsb;
4234 xfs_off_t lastoffset;
4235 xfs_off_t offset;
4271 }
4283 }
4284 }
4287 }
4289 /*
4290 * xfs_free_file_space()
4291 * This routine frees disk space for the given file.
4292 *
4293 * This routine is only called by xfs_change_file_space
4294 * for an UNRESVSP type call.
4295 *
4296 * RETURNS:
4297 * 0 on success
4298 * errno on error
4299 *
4300 */
4301 STATIC int
4304 xfs_off_t offset,
4305 xfs_off_t len,
4307 {
4310 xfs_off_t end_dmi_offset;
4311 xfs_fileoff_t endoffset_fsb;
4313 xfs_fsblock_t firstfsb;
4314 xfs_bmap_free_t free_list;
4315 xfs_off_t ilen;
4316 xfs_bmbt_irec_t imap;
4317 xfs_off_t ioffset;
4321 uint resblks;
4324 xfs_fileoff_t startoffset_fsb;
4352 }
4367 /*
4368 * Need to zero the stuff we're not freeing, on disk.
4369 * If its a realtime file & can't use unwritten extents then we
4370 * actually need to zero the extent edges. Otherwise xfs_bunmapi
4371 * will take care of it for us.
4372 */
4381 xfs_daddr_t block;
4388 }
4397 mod++;
4400 }
4401 }
4403 /*
4404 * One contiguous piece to clear
4405 */
4408 /*
4409 * Some full blocks, possibly two pieces to clear
4410 */
4419 }
4421 /*
4422 * free file space until done or until there is an error
4423 */
4427 /*
4428 * allocate and setup the transaction
4429 */
4432 resblks,
4435 XFS_TRANS_PERM_LOG_RES,
4436 XFS_WRITE_LOG_COUNT);
4438 /*
4439 * check for running out of space
4440 */
4442 /*
4443 * Free the transaction structure.
4444 */
4448 }
4459 /*
4460 * issue the bunmapi() call to free the blocks
4461 */
4468 }
4470 /*
4471 * complete the transaction
4472 */
4476 }
4480 }
4482 out_unlock_iolock:
4487 error0:
4489 error1:
4492 XFS_ILOCK_EXCL);
4494 }
4496 /*
4497 * xfs_change_file_space()
4498 * This routine allocates or frees disk space for the given file.
4499 * The user specified parameters are checked for alignment and size
4500 * limitations.
4501 *
4502 * RETURNS:
4503 * 0 on success
4504 * errno on error
4505 *
4506 */
4507 int
4512 xfs_off_t offset,
4515 {
4518 xfs_fsize_t fsize;
4522 xfs_off_t startoffset;
4523 xfs_off_t llen;
4525 vattr_t va;
4534 /*
4535 * must be a regular file and have write permission
4536 */
4545 }
4560 }
4575 /*
4576 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
4577 * file space.
4578 * These calls do NOT zero the data space allocated to the file,
4579 * nor do they change the file size.
4580 *
4581 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
4582 * space.
4583 * These calls cause the new file data to be zeroed and the file
4584 * size to be changed.
4585 */
4601 attr_flags)))
4614 }
4630 }
4632 /*
4633 * update the inode timestamp, mode, and prealloc flag bits
4634 */
4639 /* ASSERT(0); */
4642 }
4652 /*
4653 * Note that we don't have to worry about mandatory
4654 * file locking being disabled here because we only
4655 * clear the S_ISGID bit if the Group execute bit is
4656 * on, but if it was on then mandatory locking wouldn't
4657 * have been enabled.
4658 */
4663 }
4677 }
4679 vnodeops_t xfs_vnodeops = {
4683 #ifdef HAVE_SENDFILE
4685 #endif
4719 };