| blob | 19cf90a9c762841dc8b189676cb684ee4304946f |
1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
56 int
61 {
67 uint lock_flags;
90 /*
91 * If disk quotas is on, we make sure that the dquots do exist on disk,
92 * before we start any other transactions. Trying to do this later
93 * is messy. We don't care to take a readlock to look at the ids
94 * in inode here, because we can't hold it across the trans_reserve.
95 * If the IDs do change before we take the ilock, we're covered
96 * because the i_*dquot fields will get updated anyway.
97 */
106 }
112 }
114 /*
115 * We take a reference when we initialize udqp and gdqp,
116 * so it is important that we never blindly double trip on
117 * the same variable. See xfs_create() for an example.
118 */
125 }
127 /*
128 * For the other attributes, we acquire the inode lock and
129 * first do an error checking pass.
130 */
145 }
146 }
156 }
157 }
160 }
164 /*
165 * Change file ownership. Must be the owner or privileged.
166 */
168 /*
169 * These IDs could have changed since we last looked at them.
170 * But, we're assured that if the ownership did change
171 * while we didn't have the inode locked, inode's dquot(s)
172 * would have changed also.
173 */
179 /*
180 * Do a quota reservation only if uid/gid is actually
181 * going to change.
182 */
191 }
192 }
194 /*
195 * Truncate file. Must have write permission and not be a directory.
196 */
198 /* Short circuit the truncate case for zero length files */
207 }
215 }
217 /*
218 * Make sure that the dquots are attached to the inode.
219 */
224 /*
225 * Now we can make the changes. Before we join the inode
226 * to the transaction, if ATTR_SIZE is set then take care of
227 * the part of the truncation that must be done without the
228 * inode lock. This needs to be done before joining the inode
229 * to the transaction, because the inode cannot be unlocked
230 * once it is a part of the transaction.
231 */
233 /*
234 * Do the first part of growing a file: zero any data
235 * in the last block that is beyond the old EOF. We
236 * need to do this before the inode is joined to the
237 * transaction to modify the i_size.
238 */
240 }
243 /*
244 * We are going to log the inode size change in this
245 * transaction so any previous writes that are beyond the on
246 * disk EOF and the new EOF that have not been written out need
247 * to be written here. If we do not write the data out, we
248 * expose ourselves to the null files problem.
249 *
250 * Only flush from the on disk size to the smaller of the in
251 * memory file size or the new size as that's the range we
252 * really care about here and prevents waiting for other data
253 * not within the range we care about here.
254 */
261 }
263 /* wait for all I/O to complete */
273 }
277 XFS_TRANS_PERM_LOG_RES,
278 XFS_ITRUNCATE_LOG_COUNT))) {
283 }
290 /*
291 * Only change the c/mtime if we are changing the size
292 * or we are explicitly asked to change it. This handles
293 * the semantic difference between truncate() and ftruncate()
294 * as implemented in the VFS.
295 */
307 /*
308 * signal a sync transaction unless
309 * we're truncating an already unlinked
310 * file on a wsync filesystem
311 */
313 XFS_DATA_FORK,
319 /*
320 * Truncated "down", so we're removing references
321 * to old data here - if we now delay flushing for
322 * a long time, we expose ourselves unduly to the
323 * notorious NULL files problem. So, we mark this
324 * vnode and flush it when the file is closed, and
325 * do not wait the usual (long) time for writeout.
326 */
328 }
332 }
334 /*
335 * Change file ownership. Must be the owner or privileged.
336 */
338 /*
339 * CAP_FSETID overrides the following restrictions:
340 *
341 * The set-user-ID and set-group-ID bits of a file will be
342 * cleared upon successful return from chown()
343 */
347 }
349 /*
350 * Change the ownerships and register quota modifications
351 * in the transaction.
352 */
359 }
362 }
370 }
373 }
377 }
379 /*
380 * Change file access modes.
381 */
396 }
398 /*
399 * Change file access or modified times.
400 */
407 }
414 }
417 }
419 /*
420 * Change file inode change time only if ATTR_CTIME set
421 * AND we have been called by a DMI function.
422 */
430 }
432 /*
433 * Send out timestamp changes that need to be set to the
434 * current time. Not done when called by a DMI function.
435 */
441 /*
442 * If this is a synchronous mount, make sure that the
443 * transaction goes to disk before returning to the user.
444 * This is slightly sub-optimal in that truncates require
445 * two sync transactions instead of one for wsync filesystems.
446 * One for the truncate and one for the timestamps since we
447 * don't want to change the timestamps unless we're sure the
448 * truncate worked. Truncates are less than 1% of the laddis
449 * mix so this probably isn't worth the trouble to optimize.
450 */
457 }
461 /*
462 * Release any dquot(s) the inode had kept before chown.
463 */
471 }
478 }
481 abort_return:
483 /* FALLTHROUGH */
484 error_return:
489 }
492 }
494 }
496 /*
497 * The maximum pathlen is 1024 bytes. Since the minimum file system
498 * blocksize is 512 bytes, we can get a max of 2 extents back from
499 * bmapi.
500 */
501 #define SYMLINK_MAPS 2
503 STATIC int
507 {
512 xfs_daddr_t d;
534 }
541 }
546 out:
548 }
550 int
554 {
578 }
580 out:
583 }
585 /*
586 * xfs_fsync
587 *
588 * This is called to sync the inode and its data out to disk. We need to hold
589 * the I/O lock while flushing the data, and the inode lock while flushing the
590 * inode. The inode lock CANNOT be held while flushing the data, so acquire
591 * after we're done with that.
592 */
593 int
596 {
606 /* capture size updates in I/O completion before writing the inode. */
611 /*
612 * We always need to make sure that the required inode state is safe on
613 * disk. The vnode might be clean but we still might need to force the
614 * log because of committed transactions that haven't hit the disk yet.
615 * Likewise, there could be unflushed non-transactional changes to the
616 * inode core that have to go to disk and this requires us to issue
617 * a synchronous transaction to capture these changes correctly.
618 *
619 * This code relies on the assumption that if the update_* fields
620 * of the inode are clear and the inode is unpinned then it is clean
621 * and no action is required.
622 */
626 /*
627 * Timestamps/size haven't changed since last inode flush or
628 * inode transaction commit. That means either nothing got
629 * written or a transaction committed which caught the updates.
630 * If the latter happened and the transaction hasn't hit the
631 * disk yet, the inode will be still be pinned. If it is,
632 * force the log.
633 */
642 /*
643 * If the inode is not pinned and nothing has changed
644 * we don't need to flush the cache.
645 */
647 }
649 /*
650 * Kick off a transaction to log the inode core to get the
651 * updates. The sync transaction will also force the log.
652 */
660 }
663 /*
664 * Note - it's possible that we might have pushed ourselves out
665 * of the way during trans_reserve which would flush the inode.
666 * But there's no guarantee that the inode buffer has actually
667 * gone out yet (it's delwri). Plus the buffer could be pinned
668 * anyway if it's part of an inode in another recent
669 * transaction. So we play it safe and fire off the
670 * transaction anyway.
671 */
679 }
682 /*
683 * If the log write didn't issue an ordered tag we need
684 * to flush the disk cache for the data device now.
685 */
689 /*
690 * If this inode is on the RT dev we need to flush that
691 * cache as well.
692 */
695 }
698 }
700 /*
701 * This is called by xfs_inactive to free any blocks beyond eof
702 * when the link count isn't zero and by xfs_dm_punch_hole() when
703 * punching a hole to EOF.
704 */
705 int
710 {
713 xfs_fileoff_t end_fsb;
714 xfs_fileoff_t last_fsb;
715 xfs_filblks_t map_len;
717 xfs_bmbt_irec_t imap;
720 /*
721 * Figure out if there are any blocks beyond the end
722 * of the file. If not, then there is nothing to do.
723 */
739 /*
740 * Attach the dquots to the inode up front.
741 */
745 /*
746 * There are blocks after the end of file.
747 * Free them up now by truncating the file to
748 * its current size.
749 */
752 /*
753 * Do the xfs_itruncate_start() call before
754 * reserving any log space because
755 * itruncate_start will call into the buffer
756 * cache and we can't
757 * do that within a transaction.
758 */
768 }
773 XFS_ITRUNCATE_LOG_COUNT);
779 }
783 XFS_IOLOCK_EXCL |
784 XFS_ILOCK_EXCL);
789 XFS_DATA_FORK,
791 /*
792 * If we get an error at this point we
793 * simply don't bother truncating the file.
794 */
798 XFS_TRANS_ABORT));
801 XFS_TRANS_RELEASE_LOG_RES);
802 }
805 }
807 }
809 /*
810 * Free a symlink that has blocks associated with it.
811 */
812 STATIC int
816 {
821 xfs_fsblock_t first_block;
822 xfs_bmap_free_t free_list;
834 /*
835 * We're freeing a symlink that has some
836 * blocks allocated to it. Free the
837 * blocks here. We know that we've got
838 * either 1 or 2 extents and that we can
839 * free them all in one bunmapi call.
840 */
848 }
849 /*
850 * Lock the inode, fix the size, and join it to the transaction.
851 * Hold it so in the normal path, we still have it locked for
852 * the second transaction. In the error paths we need it
853 * held so the cancel won't rele it, see below.
854 */
861 /*
862 * Find the block(s) so we can inval and unmap them.
863 */
871 /*
872 * Invalidate the block(s).
873 */
879 }
880 /*
881 * Unmap the dead block(s) to the free_list.
882 */
887 /*
888 * Commit the first transaction. This logs the EFI and the inode.
889 */
892 /*
893 * The transaction must have been committed, since there were
894 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
895 * The new tp has the extent freeing and EFDs.
896 */
898 /*
899 * The first xact was committed, so add the inode to the new one.
900 * Mark it dirty so it will be logged and moved forward in the log as
901 * part of every commit.
902 */
906 /*
907 * Get a new, empty transaction to return to our caller.
908 */
910 /*
911 * Commit the transaction containing extent freeing and EFDs.
912 * If we get an error on the commit here or on the reserve below,
913 * we need to unlock the inode since the new transaction doesn't
914 * have the inode attached.
915 */
921 }
922 /*
923 * transaction commit worked ok so we can drop the extra ticket
924 * reference that we gained in xfs_trans_dup()
925 */
928 /*
929 * Remove the memory for extent descriptions (just bookkeeping).
930 */
934 /*
935 * Put an itruncate log reservation in the new transaction
936 * for our caller.
937 */
942 }
943 /*
944 * Return with the inode locked but not joined to the transaction.
945 */
949 error1:
951 error0:
952 /*
953 * Have to come here with the inode locked and either
954 * (held and in the transaction) or (not in the transaction).
955 * If the inode isn't held then cancel would iput it, but
956 * that's wrong since this is inactive and the vnode ref
957 * count is 0 already.
958 * Cancel won't do anything to the inode if held, but it still
959 * needs to be locked until the cancel is done, if it was
960 * joined to the transaction.
961 */
967 }
969 STATIC int
973 {
977 /*
978 * We're freeing a symlink which fit into
979 * the inode. Just free the memory used
980 * to hold the old symlink.
981 */
985 XFS_ITRUNCATE_LOG_COUNT);
991 }
994 /*
995 * Zero length symlinks _can_ exist.
996 */
1000 XFS_DATA_FORK);
1002 }
1004 }
1006 STATIC int
1010 {
1032 XFS_INACTIVE_LOG_COUNT);
1046 error_cancel:
1049 error_unlock:
1053 }
1055 int
1058 {
1065 /* If this is a read-only mount, don't do this (would generate I/O) */
1072 /*
1073 * If we are using filestreams, and we have an unlinked
1074 * file that we are processing the last close on, then nothing
1075 * will be able to reopen and write to this file. Purge this
1076 * inode from the filestreams cache so that it doesn't delay
1077 * teardown of the inode.
1078 */
1082 /*
1083 * If we previously truncated this file and removed old data
1084 * in the process, we want to initiate "early" writeout on
1085 * the last close. This is an attempt to combat the notorious
1086 * NULL files problem which is particularly noticable from a
1087 * truncate down, buffered (re-)write (delalloc), followed by
1088 * a crash. What we are effectively doing here is
1089 * significantly reducing the time window where we'd otherwise
1090 * be exposed to that problem.
1091 */
1095 }
1107 }
1108 }
1111 }
1113 /*
1114 * xfs_inactive
1115 *
1116 * This is called when the vnode reference count for the vnode
1117 * goes to zero. If the file has been unlinked, then it must
1118 * now be truncated. Also, we clear all of the read-ahead state
1119 * kept for the inode here since the file is now closed.
1120 */
1121 int
1124 {
1125 xfs_bmap_free_t free_list;
1126 xfs_fsblock_t first_block;
1135 /*
1136 * If the inode is already free, then there can be nothing
1137 * to clean up here.
1138 */
1143 }
1145 /*
1146 * Only do a truncate if it's a regular file with
1147 * some actual space in it. It's OK to look at the
1148 * inode's fields without the lock because we're the
1149 * only one with a reference to the inode.
1150 */
1163 /* If this is a read-only mount, don't do this (would generate I/O) */
1178 }
1180 }
1189 /*
1190 * Do the xfs_itruncate_start() call before
1191 * reserving any log space because itruncate_start
1192 * will call into the buffer cache and we can't
1193 * do that within a transaction.
1194 */
1202 }
1207 XFS_ITRUNCATE_LOG_COUNT);
1209 /* Don't call itruncate_cleanup */
1214 }
1220 /*
1221 * normally, we have to run xfs_itruncate_finish sync.
1222 * But if filesystem is wsync and we're in the inactive
1223 * path, then we know that nlink == 0, and that the
1224 * xaction that made nlink == 0 is permanently committed
1225 * since xfs_remove runs as a synchronous transaction.
1226 */
1235 }
1238 /*
1239 * If we get an error while cleaning up a
1240 * symlink we bail out.
1241 */
1249 }
1257 XFS_INACTIVE_LOG_COUNT);
1262 }
1267 }
1269 /*
1270 * If there are attributes associated with the file
1271 * then blow them away now. The code calls a routine
1272 * that recursively deconstructs the attribute fork.
1273 * We need to just commit the current transaction
1274 * because we can't use it for xfs_attr_inactive().
1275 */
1278 /*
1279 * If we got an error, the transaction is already
1280 * cancelled, and the inode is unlocked. Just get out.
1281 */
1286 }
1288 /*
1289 * Free the inode.
1290 */
1294 /*
1295 * If we fail to free the inode, shut down. The cancel
1296 * might do that, we need to make sure. Otherwise the
1297 * inode might be lost for a long time or forever.
1298 */
1304 }
1307 /*
1308 * Credit the quota account(s). The inode is gone.
1309 */
1312 /*
1313 * Just ignore errors at this point. There is nothing we can
1314 * do except to try to keep going. Make sure it's not a silent
1315 * error.
1316 */
1325 }
1326 /*
1327 * Release the dquots held by inode, if any.
1328 */
1333 out:
1335 }
1337 /*
1338 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
1339 * is allowed, otherwise it has to be an exact match. If a CI match is found,
1340 * ci_name->name will point to a the actual name (caller must free) or
1341 * will be set to NULL if an exact match is found.
1342 */
1343 int
1349 {
1350 xfs_ino_t inum;
1352 uint lock_mode;
1373 out_free_name:
1376 out:
1379 }
1381 int
1385 mode_t mode,
1386 xfs_dev_t rdev,
1389 {
1395 xfs_bmap_free_t free_list;
1396 xfs_fsblock_t first_block;
1398 uint cancel_flags;
1400 xfs_prid_t prid;
1403 uint resblks;
1404 uint log_res;
1405 uint log_count;
1420 }
1424 else
1427 /*
1428 * Make sure that we have allocated dquot(s) on disk.
1429 */
1447 }
1451 /*
1452 * Initially assume that the file does not exist and
1453 * reserve the resources for that case. If that is not
1454 * the case we'll drop the one we have and get a more
1455 * appropriate transaction later.
1456 */
1460 /* flush outstanding delalloc blocks and retry */
1464 }
1466 /* No space at all so try a "no-allocation" reservation */
1470 }
1474 }
1479 /*
1480 * Check for directory link count overflow.
1481 */
1485 }
1489 /*
1490 * Reserve disk quota and the inode.
1491 */
1500 /*
1501 * A newly created regular or special file just has one directory
1502 * entry pointing to them, but a directory also the "." entry
1503 * pointing to itself.
1504 */
1511 }
1513 /*
1514 * At this point, we've gotten a newly allocated inode.
1515 * It is locked (and joined to the transaction).
1516 */
1520 /*
1521 * Now we join the directory inode to the transaction. We do not do it
1522 * earlier because xfs_dir_ialloc might commit the previous transaction
1523 * (and release all the locks). An error from here on will result in
1524 * the transaction cancel unlocking dp so don't do it explicitly in the
1525 * error path.
1526 */
1537 }
1549 }
1551 /*
1552 * If this is a synchronous mount, make sure that the
1553 * create transaction goes to disk before returning to
1554 * the user.
1555 */
1559 /*
1560 * Attach the dquot(s) to the inodes and modify them incore.
1561 * These ids of the inode couldn't have changed since the new
1562 * inode has been locked ever since it was created.
1563 */
1566 /*
1567 * xfs_trans_commit normally decrements the vnode ref count
1568 * when it unlocks the inode. Since we want to return the
1569 * vnode to the caller, we bump the vnode ref count now.
1570 */
1581 }
1588 /* Fallthrough to std_return with error = 0 */
1589 std_return:
1594 }
1598 out_bmap_cancel:
1600 out_trans_abort:
1602 out_trans_cancel:
1604 out_dqrele:
1613 out_abort_rele:
1614 /*
1615 * Wait until after the current transaction is aborted to
1616 * release the inode. This prevents recursive transactions
1617 * and deadlocks from xfs_inactive.
1618 */
1625 }
1627 #ifdef DEBUG
1633 #endif
1635 /*
1636 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1637 * a different value
1638 */
1641 {
1648 }
1650 /*
1651 * The following routine will lock n inodes in exclusive mode.
1652 * We assume the caller calls us with the inodes in i_ino order.
1653 *
1654 * We need to detect deadlock where an inode that we lock
1655 * is in the AIL and we start waiting for another inode that is locked
1656 * by a thread in a long running transaction (such as truncate). This can
1657 * result in deadlock since the long running trans might need to wait
1658 * for the inode we just locked in order to push the tail and free space
1659 * in the log.
1660 */
1661 void
1665 uint lock_mode)
1666 {
1675 again:
1682 /*
1683 * If try_lock is not set yet, make sure all locked inodes
1684 * are not in the AIL.
1685 * If any are, set try_lock to be used later.
1686 */
1692 try_lock++;
1693 }
1694 }
1695 }
1697 /*
1698 * If any of the previous locks we have locked is in the AIL,
1699 * we must TRY to get the second and subsequent locks. If
1700 * we can't get any, we must release all we have
1701 * and try again.
1702 */
1705 /* try_lock must be 0 if i is 0. */
1706 /*
1707 * try_lock means we have an inode locked
1708 * that is in the AIL.
1709 */
1712 attempts++;
1714 /*
1715 * Unlock all previous guys and try again.
1716 * xfs_iunlock will try to push the tail
1717 * if the inode is in the AIL.
1718 */
1722 /*
1723 * Check to see if we've already
1724 * unlocked this one.
1725 * Not the first one going back,
1726 * and the inode ptr is the same.
1727 */
1733 }
1737 #ifdef DEBUG
1738 xfs_lock_delays++;
1739 #endif
1740 }
1744 }
1747 }
1748 }
1750 #ifdef DEBUG
1756 xfs_locked_n++;
1757 }
1758 #endif
1759 }
1761 /*
1762 * xfs_lock_two_inodes() can only be used to lock one type of lock
1763 * at a time - the iolock or the ilock, but not both at once. If
1764 * we lock both at once, lockdep will report false positives saying
1765 * we have violated locking orders.
1766 */
1767 void
1771 uint lock_mode)
1772 {
1785 }
1787 again:
1790 /*
1791 * If the first lock we have locked is in the AIL, we must TRY to get
1792 * the second lock. If we can't get it, we must release the first one
1793 * and try again.
1794 */
1802 }
1805 }
1806 }
1808 int
1813 {
1818 xfs_bmap_free_t free_list;
1819 xfs_fsblock_t first_block;
1823 uint resblks;
1824 uint log_count;
1838 }
1854 }
1857 /*
1858 * We try to get the real space reservation first,
1859 * allowing for directory btree deletion(s) implying
1860 * possible bmap insert(s). If we can't get the space
1861 * reservation then we use 0 instead, and avoid the bmap
1862 * btree insert(s) in the directory code by, if the bmap
1863 * insert tries to happen, instead trimming the LAST
1864 * block from the directory.
1865 */
1873 }
1878 }
1882 /*
1883 * At this point, we've gotten both the directory and the entry
1884 * inodes locked.
1885 */
1892 /*
1893 * If we're removing a directory perform some additional validation.
1894 */
1900 }
1904 }
1905 }
1913 }
1917 /*
1918 * Drop the link from ip's "..".
1919 */
1924 /*
1925 * Drop the "." link from ip to self.
1926 */
1931 /*
1932 * When removing a non-directory we need to log the parent
1933 * inode here. For a directory this is done implicitly
1934 * by the xfs_droplink call for the ".." entry.
1935 */
1937 }
1939 /*
1940 * Drop the link from dp to ip.
1941 */
1946 /*
1947 * Determine if this is the last link while
1948 * we are in the transaction.
1949 */
1952 /*
1953 * If this is a synchronous mount, make sure that the
1954 * remove transaction goes to disk before returning to
1955 * the user.
1956 */
1968 /*
1969 * If we are using filestreams, kill the stream association.
1970 * If the file is still open it may get a new one but that
1971 * will get killed on last close in xfs_close() so we don't
1972 * have to worry about that.
1973 */
1980 std_return:
1985 }
1989 out_bmap_cancel:
1992 out_trans_cancel:
1995 }
1997 int
2002 {
2006 xfs_bmap_free_t free_list;
2007 xfs_fsblock_t first_block;
2027 }
2029 /* Return through std_return after this point. */
2048 }
2052 }
2056 /*
2057 * Increment vnode ref counts since xfs_trans_commit &
2058 * xfs_trans_cancel will both unlock the inodes and
2059 * decrement the associated ref counts.
2060 */
2066 /*
2067 * If the source has too many links, we can't make any more to it.
2068 */
2072 }
2074 /*
2075 * If we are using project inheritance, we only allow hard link
2076 * creation in our tree when the project IDs are the same; else
2077 * the tree quota mechanism could be circumvented.
2078 */
2083 }
2102 /*
2103 * If this is a synchronous mount, make sure that the
2104 * link transaction goes to disk before returning to
2105 * the user.
2106 */
2109 }
2115 }
2121 /* Fall through to std_return with error = 0. */
2122 std_return:
2128 }
2131 abort_return:
2133 /* FALLTHROUGH */
2135 error_return:
2138 }
2140 int
2145 mode_t mode,
2148 {
2154 xfs_bmap_free_t free_list;
2155 xfs_fsblock_t first_block;
2157 uint cancel_flags;
2159 xfs_fileoff_t first_fsb;
2160 xfs_filblks_t fs_blocks;
2163 xfs_daddr_t d;
2168 xfs_prid_t prid;
2170 uint resblks;
2182 /*
2183 * Check component lengths of the target path name.
2184 */
2195 }
2197 /* Return through std_return after this point. */
2202 else
2205 /*
2206 * Make sure that we have allocated dquot(s) on disk.
2207 */
2216 /*
2217 * The symlink will fit into the inode data fork?
2218 * There can't be any attributes so we get the whole variable part.
2219 */
2222 else
2231 }
2235 }
2240 /*
2241 * Check whether the directory allows new symlinks or not.
2242 */
2246 }
2248 /*
2249 * Reserve disk quota : blocks and inode.
2250 */
2255 /*
2256 * Check for ability to enter directory entry, if no space reserved.
2257 */
2261 /*
2262 * Initialize the bmap freelist prior to calling either
2263 * bmapi or the directory create code.
2264 */
2267 /*
2268 * Allocate an inode for the symlink.
2269 */
2276 }
2279 /*
2280 * An error after we've joined dp to the transaction will result in the
2281 * transaction cancel unlocking dp so don't do it explicitly in the
2282 * error path.
2283 */
2288 /*
2289 * Also attach the dquot(s) to it, if applicable.
2290 */
2295 /*
2296 * If the symlink will fit into the inode, write it inline.
2297 */
2303 /*
2304 * The inode was initially created in extent format.
2305 */
2322 }
2338 }
2345 }
2346 }
2348 /*
2349 * Create the directory entry for the symlink.
2350 */
2358 /*
2359 * If this is a synchronous mount, make sure that the
2360 * symlink transaction goes to disk before returning to
2361 * the user.
2362 */
2365 }
2367 /*
2368 * xfs_trans_commit normally decrements the vnode ref count
2369 * when it unlocks the inode. Since we want to return the
2370 * vnode to the caller, we bump the vnode ref count now.
2371 */
2377 }
2382 /* Fall through to std_return with error = 0 or errno from
2383 * xfs_trans_commit */
2384 std_return:
2391 }
2397 error2:
2399 error1:
2402 error_return:
2411 }
2413 int
2416 u_int evmask,
2417 u_int16_t state)
2418 {
2434 }
2446 }
2448 int
2451 {
2457 /* bad inode, get out here ASAP */
2461 }
2467 /*
2468 * Make sure the atime in the XFS inode is correct before freeing the
2469 * Linux inode.
2470 */
2473 /*
2474 * If we have nothing to flush with this inode then complete the
2475 * teardown now, otherwise break the link between the xfs inode and the
2476 * linux inode and clean up the xfs inode later. This avoids flushing
2477 * the inode to disk during the delete operation itself.
2478 *
2479 * When breaking the link, we need to set the XFS_IRECLAIMABLE flag
2480 * first to ensure that xfs_iunpin() will never see an xfs inode
2481 * that has a linux inode being reclaimed. Synchronisation is provided
2482 * by the i_flags_lock.
2483 */
2489 }
2492 }
2494 /*
2495 * xfs_alloc_file_space()
2496 * This routine allocates disk space for the given file.
2497 *
2498 * If alloc_type == 0, this request is for an ALLOCSP type
2499 * request which will change the file size. In this case, no
2500 * DMAPI event will be generated by the call. A TRUNCATE event
2501 * will be generated later by xfs_setattr.
2502 *
2503 * If alloc_type != 0, this request is for a RESVSP type
2504 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
2505 * lower block boundary byte address is less than the file's
2506 * length.
2507 *
2508 * RETURNS:
2509 * 0 on success
2510 * errno on error
2511 *
2512 */
2513 STATIC int
2516 xfs_off_t offset,
2517 xfs_off_t len,
2520 {
2522 xfs_off_t count;
2523 xfs_filblks_t allocated_fsb;
2524 xfs_filblks_t allocatesize_fsb;
2526 xfs_fileoff_t startoffset_fsb;
2527 xfs_fsblock_t firstfsb;
2534 xfs_bmap_free_t free_list;
2560 /* Generate a DMAPI event if needed. */
2564 xfs_off_t end_dmi_offset;
2573 }
2575 /*
2576 * Allocate file space until done or until there is an error
2577 */
2578 retry:
2582 /*
2583 * Determine space reservations for data/realtime.
2584 */
2597 }
2609 }
2611 /*
2612 * Allocate and setup the transaction.
2613 */
2617 XFS_TRANS_PERM_LOG_RES,
2618 XFS_WRITE_LOG_COUNT);
2619 /*
2620 * Check for running out of space
2621 */
2623 /*
2624 * Free the transaction structure.
2625 */
2629 }
2639 /*
2640 * Issue the xfs_bmapi() call to allocate the blocks
2641 */
2649 }
2651 /*
2652 * Complete the transaction
2653 */
2657 }
2663 }
2670 }
2674 }
2675 dmapi_enospc_check:
2684 /* else fall through with error from XFS_SEND_DATA */
2685 }
2697 }
2699 /*
2700 * Zero file bytes between startoff and endoff inclusive.
2701 * The iolock is held exclusive and no blocks are buffered.
2702 *
2703 * This function is used by xfs_free_file_space() to zero
2704 * partial blocks when the range to free is not block aligned.
2705 * When unreserving space with boundaries that are not block
2706 * aligned we round up the start and round down the end
2707 * boundaries and then use this function to zero the parts of
2708 * the blocks that got dropped during the rounding.
2709 */
2710 STATIC int
2713 xfs_off_t startoff,
2714 xfs_off_t endoff)
2715 {
2716 xfs_bmbt_irec_t imap;
2717 xfs_fileoff_t offset_fsb;
2718 xfs_off_t lastoffset;
2719 xfs_off_t offset;
2725 /*
2726 * Avoid doing I/O beyond eof - it's not necessary
2727 * since nothing can read beyond eof. The space will
2728 * be zeroed when the file is extended anyway.
2729 */
2769 }
2782 }
2783 }
2786 }
2788 /*
2789 * xfs_free_file_space()
2790 * This routine frees disk space for the given file.
2791 *
2792 * This routine is only called by xfs_change_file_space
2793 * for an UNRESVSP type call.
2794 *
2795 * RETURNS:
2796 * 0 on success
2797 * errno on error
2798 *
2799 */
2800 STATIC int
2803 xfs_off_t offset,
2804 xfs_off_t len,
2806 {
2809 xfs_off_t end_dmi_offset;
2810 xfs_fileoff_t endoffset_fsb;
2812 xfs_fsblock_t firstfsb;
2813 xfs_bmap_free_t free_list;
2814 xfs_bmbt_irec_t imap;
2815 xfs_off_t ioffset;
2819 uint resblks;
2820 uint rounding;
2822 xfs_fileoff_t startoffset_fsb;
2850 }
2856 /* wait for the completion of any pending DIOs */
2858 }
2868 }
2870 /*
2871 * Need to zero the stuff we're not freeing, on disk.
2872 * If it's a realtime file & can't use unwritten extents then we
2873 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2874 * will take care of it for us.
2875 */
2884 xfs_daddr_t block;
2891 }
2900 mod++;
2903 }
2904 }
2906 /*
2907 * One contiguous piece to clear
2908 */
2911 /*
2912 * Some full blocks, possibly two pieces to clear
2913 */
2922 }
2924 /*
2925 * free file space until done or until there is an error
2926 */
2930 /*
2931 * allocate and setup the transaction. Allow this
2932 * transaction to dip into the reserve blocks to ensure
2933 * the freeing of the space succeeds at ENOSPC.
2934 */
2938 resblks,
2941 XFS_TRANS_PERM_LOG_RES,
2942 XFS_WRITE_LOG_COUNT);
2944 /*
2945 * check for running out of space
2946 */
2948 /*
2949 * Free the transaction structure.
2950 */
2954 }
2958 XFS_QMOPT_RES_REGBLKS);
2965 /*
2966 * issue the bunmapi() call to free the blocks
2967 */
2974 }
2976 /*
2977 * complete the transaction
2978 */
2982 }
2986 }
2988 out_unlock_iolock:
2993 error0:
2995 error1:
2998 XFS_ILOCK_EXCL);
3000 }
3002 /*
3003 * xfs_change_file_space()
3004 * This routine allocates or frees disk space for the given file.
3005 * The user specified parameters are checked for alignment and size
3006 * limitations.
3007 *
3008 * RETURNS:
3009 * 0 on success
3010 * errno on error
3011 *
3012 */
3013 int
3018 xfs_off_t offset,
3020 {
3024 xfs_fsize_t fsize;
3026 xfs_off_t startoffset;
3027 xfs_off_t llen;
3047 }
3062 /*
3063 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
3064 * file space.
3065 * These calls do NOT zero the data space allocated to the file,
3066 * nor do they change the file size.
3067 *
3068 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
3069 * space.
3070 * These calls cause the new file data to be zeroed and the file
3071 * size to be changed.
3072 */
3088 attr_flags)))
3101 }
3117 }
3119 /*
3120 * update the inode timestamp, mode, and prealloc flag bits
3121 */
3126 /* ASSERT(0); */
3129 }
3139 /*
3140 * Note that we don't have to worry about mandatory
3141 * file locking being disabled here because we only
3142 * clear the S_ISGID bit if the Group execute bit is
3143 * on, but if it was on then mandatory locking wouldn't
3144 * have been enabled.
3145 */
3150 }
3164 }