2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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.
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.
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
21 #include "xfs_types.h"
25 #include "xfs_trans.h"
29 #include "xfs_mount.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dinode.h"
34 #include "xfs_inode.h"
35 #include "xfs_inode_item.h"
36 #include "xfs_itable.h"
37 #include "xfs_ialloc.h"
38 #include "xfs_alloc.h"
43 #include "xfs_error.h"
44 #include "xfs_quota.h"
45 #include "xfs_utils.h"
46 #include "xfs_rtalloc.h"
47 #include "xfs_trans_space.h"
48 #include "xfs_log_priv.h"
49 #include "xfs_filestream.h"
50 #include "xfs_vnodeops.h"
51 #include "xfs_trace.h"
54 * The maximum pathlen is 1024 bytes. Since the minimum file system
55 * blocksize is 512 bytes, we can get a max of 2 extents back from
58 #define SYMLINK_MAPS 2
65 xfs_mount_t *mp = ip->i_mount;
66 int pathlen = ip->i_d.di_size;
67 int nmaps = SYMLINK_MAPS;
68 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
75 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
80 for (n = 0; n < nmaps; n++) {
81 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
82 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
84 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
85 XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK);
87 return XFS_ERROR(ENOMEM);
90 xfs_buf_ioerror_alert(bp, __func__);
94 if (pathlen < byte_cnt)
98 memcpy(link, bp->b_addr, byte_cnt);
102 link[ip->i_d.di_size] = '\0';
114 xfs_mount_t *mp = ip->i_mount;
118 trace_xfs_readlink(ip);
120 if (XFS_FORCED_SHUTDOWN(mp))
121 return XFS_ERROR(EIO);
123 xfs_ilock(ip, XFS_ILOCK_SHARED);
125 pathlen = ip->i_d.di_size;
129 if (pathlen < 0 || pathlen > MAXPATHLEN) {
130 xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
131 __func__, (unsigned long long) ip->i_ino,
132 (long long) pathlen);
134 error = XFS_ERROR(EFSCORRUPTED);
139 if (ip->i_df.if_flags & XFS_IFINLINE) {
140 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
141 link[pathlen] = '\0';
143 error = xfs_readlink_bmap(ip, link);
147 xfs_iunlock(ip, XFS_ILOCK_SHARED);
152 * Flags for xfs_free_eofblocks
154 #define XFS_FREE_EOF_TRYLOCK (1<<0)
157 * This is called by xfs_inactive to free any blocks beyond eof
158 * when the link count isn't zero and by xfs_dm_punch_hole() when
159 * punching a hole to EOF.
169 xfs_fileoff_t end_fsb;
170 xfs_fileoff_t last_fsb;
171 xfs_filblks_t map_len;
173 xfs_bmbt_irec_t imap;
176 * Figure out if there are any blocks beyond the end
177 * of the file. If not, then there is nothing to do.
179 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
180 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
181 if (last_fsb <= end_fsb)
183 map_len = last_fsb - end_fsb;
186 xfs_ilock(ip, XFS_ILOCK_SHARED);
187 error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
188 xfs_iunlock(ip, XFS_ILOCK_SHARED);
190 if (!error && (nimaps != 0) &&
191 (imap.br_startblock != HOLESTARTBLOCK ||
192 ip->i_delayed_blks)) {
194 * Attach the dquots to the inode up front.
196 error = xfs_qm_dqattach(ip, 0);
201 * There are blocks after the end of file.
202 * Free them up now by truncating the file to
205 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
207 if (flags & XFS_FREE_EOF_TRYLOCK) {
208 if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
209 xfs_trans_cancel(tp, 0);
213 xfs_ilock(ip, XFS_IOLOCK_EXCL);
216 error = xfs_trans_reserve(tp, 0,
217 XFS_ITRUNCATE_LOG_RES(mp),
218 0, XFS_TRANS_PERM_LOG_RES,
219 XFS_ITRUNCATE_LOG_COUNT);
221 ASSERT(XFS_FORCED_SHUTDOWN(mp));
222 xfs_trans_cancel(tp, 0);
223 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
227 xfs_ilock(ip, XFS_ILOCK_EXCL);
228 xfs_trans_ijoin(tp, ip, 0);
231 * Do not update the on-disk file size. If we update the
232 * on-disk file size and then the system crashes before the
233 * contents of the file are flushed to disk then the files
234 * may be full of holes (ie NULL files bug).
236 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
240 * If we get an error at this point we simply don't
241 * bother truncating the file.
244 (XFS_TRANS_RELEASE_LOG_RES |
247 error = xfs_trans_commit(tp,
248 XFS_TRANS_RELEASE_LOG_RES);
250 xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
256 * Free a symlink that has blocks associated with it.
259 xfs_inactive_symlink_rmt(
267 xfs_fsblock_t first_block;
268 xfs_bmap_free_t free_list;
271 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
279 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
281 * We're freeing a symlink that has some
282 * blocks allocated to it. Free the
283 * blocks here. We know that we've got
284 * either 1 or 2 extents and that we can
285 * free them all in one bunmapi call.
287 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
288 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
289 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
290 ASSERT(XFS_FORCED_SHUTDOWN(mp));
291 xfs_trans_cancel(tp, 0);
296 * Lock the inode, fix the size, and join it to the transaction.
297 * Hold it so in the normal path, we still have it locked for
298 * the second transaction. In the error paths we need it
299 * held so the cancel won't rele it, see below.
301 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
302 size = (int)ip->i_d.di_size;
304 xfs_trans_ijoin(tp, ip, 0);
305 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
307 * Find the block(s) so we can inval and unmap them.
310 xfs_bmap_init(&free_list, &first_block);
311 nmaps = ARRAY_SIZE(mval);
312 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
317 * Invalidate the block(s).
319 for (i = 0; i < nmaps; i++) {
320 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
321 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
322 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
327 xfs_trans_binval(tp, bp);
330 * Unmap the dead block(s) to the free_list.
332 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
333 &first_block, &free_list, &done)))
337 * Commit the first transaction. This logs the EFI and the inode.
339 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
342 * The transaction must have been committed, since there were
343 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
344 * The new tp has the extent freeing and EFDs.
348 * The first xact was committed, so add the inode to the new one.
349 * Mark it dirty so it will be logged and moved forward in the log as
350 * part of every commit.
352 xfs_trans_ijoin(tp, ip, 0);
353 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
355 * Get a new, empty transaction to return to our caller.
357 ntp = xfs_trans_dup(tp);
359 * Commit the transaction containing extent freeing and EFDs.
360 * If we get an error on the commit here or on the reserve below,
361 * we need to unlock the inode since the new transaction doesn't
362 * have the inode attached.
364 error = xfs_trans_commit(tp, 0);
367 ASSERT(XFS_FORCED_SHUTDOWN(mp));
371 * transaction commit worked ok so we can drop the extra ticket
372 * reference that we gained in xfs_trans_dup()
374 xfs_log_ticket_put(tp->t_ticket);
377 * Remove the memory for extent descriptions (just bookkeeping).
379 if (ip->i_df.if_bytes)
380 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
381 ASSERT(ip->i_df.if_bytes == 0);
383 * Put an itruncate log reservation in the new transaction
386 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
387 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
388 ASSERT(XFS_FORCED_SHUTDOWN(mp));
392 * Return with the inode locked but not joined to the transaction.
398 xfs_bmap_cancel(&free_list);
401 * Have to come here with the inode locked and either
402 * (held and in the transaction) or (not in the transaction).
403 * If the inode isn't held then cancel would iput it, but
404 * that's wrong since this is inactive and the vnode ref
405 * count is 0 already.
406 * Cancel won't do anything to the inode if held, but it still
407 * needs to be locked until the cancel is done, if it was
408 * joined to the transaction.
410 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
411 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
418 xfs_inactive_symlink_local(
424 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
426 * We're freeing a symlink which fit into
427 * the inode. Just free the memory used
428 * to hold the old symlink.
430 error = xfs_trans_reserve(*tpp, 0,
431 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
432 0, XFS_TRANS_PERM_LOG_RES,
433 XFS_ITRUNCATE_LOG_COUNT);
436 xfs_trans_cancel(*tpp, 0);
440 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
443 * Zero length symlinks _can_ exist.
445 if (ip->i_df.if_bytes > 0) {
446 xfs_idata_realloc(ip,
447 -(ip->i_df.if_bytes),
449 ASSERT(ip->i_df.if_bytes == 0);
463 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
466 ASSERT(ip->i_d.di_forkoff != 0);
467 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
468 xfs_iunlock(ip, XFS_ILOCK_EXCL);
472 error = xfs_attr_inactive(ip);
476 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
477 error = xfs_trans_reserve(tp, 0,
478 XFS_IFREE_LOG_RES(mp),
479 0, XFS_TRANS_PERM_LOG_RES,
480 XFS_INACTIVE_LOG_COUNT);
484 xfs_ilock(ip, XFS_ILOCK_EXCL);
485 xfs_trans_ijoin(tp, ip, 0);
486 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
488 ASSERT(ip->i_d.di_anextents == 0);
494 ASSERT(XFS_FORCED_SHUTDOWN(mp));
495 xfs_trans_cancel(tp, 0);
498 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
506 xfs_mount_t *mp = ip->i_mount;
509 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
512 /* If this is a read-only mount, don't do this (would generate I/O) */
513 if (mp->m_flags & XFS_MOUNT_RDONLY)
516 if (!XFS_FORCED_SHUTDOWN(mp)) {
520 * If we are using filestreams, and we have an unlinked
521 * file that we are processing the last close on, then nothing
522 * will be able to reopen and write to this file. Purge this
523 * inode from the filestreams cache so that it doesn't delay
524 * teardown of the inode.
526 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
527 xfs_filestream_deassociate(ip);
530 * If we previously truncated this file and removed old data
531 * in the process, we want to initiate "early" writeout on
532 * the last close. This is an attempt to combat the notorious
533 * NULL files problem which is particularly noticeable from a
534 * truncate down, buffered (re-)write (delalloc), followed by
535 * a crash. What we are effectively doing here is
536 * significantly reducing the time window where we'd otherwise
537 * be exposed to that problem.
539 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
541 xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
542 if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
543 xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
547 if (ip->i_d.di_nlink == 0)
550 if ((S_ISREG(ip->i_d.di_mode) &&
551 (VFS_I(ip)->i_size > 0 ||
552 (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
553 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
554 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
557 * If we can't get the iolock just skip truncating the blocks
558 * past EOF because we could deadlock with the mmap_sem
559 * otherwise. We'll get another chance to drop them once the
560 * last reference to the inode is dropped, so we'll never leak
561 * blocks permanently.
563 * Further, check if the inode is being opened, written and
564 * closed frequently and we have delayed allocation blocks
565 * outstanding (e.g. streaming writes from the NFS server),
566 * truncating the blocks past EOF will cause fragmentation to
569 * In this case don't do the truncation, either, but we have to
570 * be careful how we detect this case. Blocks beyond EOF show
571 * up as i_delayed_blks even when the inode is clean, so we
572 * need to truncate them away first before checking for a dirty
573 * release. Hence on the first dirty close we will still remove
574 * the speculative allocation, but after that we will leave it
577 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
580 error = xfs_free_eofblocks(mp, ip,
581 XFS_FREE_EOF_TRYLOCK);
585 /* delalloc blocks after truncation means it really is dirty */
586 if (ip->i_delayed_blks)
587 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
595 * This is called when the vnode reference count for the vnode
596 * goes to zero. If the file has been unlinked, then it must
597 * now be truncated. Also, we clear all of the read-ahead state
598 * kept for the inode here since the file is now closed.
604 xfs_bmap_free_t free_list;
605 xfs_fsblock_t first_block;
613 * If the inode is already free, then there can be nothing
616 if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
617 ASSERT(ip->i_df.if_real_bytes == 0);
618 ASSERT(ip->i_df.if_broot_bytes == 0);
619 return VN_INACTIVE_CACHE;
623 * Only do a truncate if it's a regular file with
624 * some actual space in it. It's OK to look at the
625 * inode's fields without the lock because we're the
626 * only one with a reference to the inode.
628 truncate = ((ip->i_d.di_nlink == 0) &&
629 ((ip->i_d.di_size != 0) || XFS_ISIZE(ip) != 0 ||
630 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
631 S_ISREG(ip->i_d.di_mode));
637 /* If this is a read-only mount, don't do this (would generate I/O) */
638 if (mp->m_flags & XFS_MOUNT_RDONLY)
641 if (ip->i_d.di_nlink != 0) {
642 if ((S_ISREG(ip->i_d.di_mode) &&
643 (VFS_I(ip)->i_size > 0 ||
644 (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) &&
645 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
646 (!(ip->i_d.di_flags &
647 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
648 ip->i_delayed_blks != 0))) {
649 error = xfs_free_eofblocks(mp, ip, 0);
651 return VN_INACTIVE_CACHE;
656 ASSERT(ip->i_d.di_nlink == 0);
658 error = xfs_qm_dqattach(ip, 0);
660 return VN_INACTIVE_CACHE;
662 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
664 xfs_ilock(ip, XFS_IOLOCK_EXCL);
666 error = xfs_trans_reserve(tp, 0,
667 XFS_ITRUNCATE_LOG_RES(mp),
668 0, XFS_TRANS_PERM_LOG_RES,
669 XFS_ITRUNCATE_LOG_COUNT);
671 /* Don't call itruncate_cleanup */
672 ASSERT(XFS_FORCED_SHUTDOWN(mp));
673 xfs_trans_cancel(tp, 0);
674 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
675 return VN_INACTIVE_CACHE;
678 xfs_ilock(ip, XFS_ILOCK_EXCL);
679 xfs_trans_ijoin(tp, ip, 0);
682 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
684 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
687 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
688 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
689 return VN_INACTIVE_CACHE;
692 ASSERT(ip->i_d.di_nextents == 0);
693 } else if (S_ISLNK(ip->i_d.di_mode)) {
696 * If we get an error while cleaning up a
697 * symlink we bail out.
699 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
700 xfs_inactive_symlink_rmt(ip, &tp) :
701 xfs_inactive_symlink_local(ip, &tp);
705 return VN_INACTIVE_CACHE;
708 xfs_trans_ijoin(tp, ip, 0);
710 error = xfs_trans_reserve(tp, 0,
711 XFS_IFREE_LOG_RES(mp),
712 0, XFS_TRANS_PERM_LOG_RES,
713 XFS_INACTIVE_LOG_COUNT);
715 ASSERT(XFS_FORCED_SHUTDOWN(mp));
716 xfs_trans_cancel(tp, 0);
717 return VN_INACTIVE_CACHE;
720 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
721 xfs_trans_ijoin(tp, ip, 0);
725 * If there are attributes associated with the file
726 * then blow them away now. The code calls a routine
727 * that recursively deconstructs the attribute fork.
728 * We need to just commit the current transaction
729 * because we can't use it for xfs_attr_inactive().
731 if (ip->i_d.di_anextents > 0) {
732 error = xfs_inactive_attrs(ip, &tp);
734 * If we got an error, the transaction is already
735 * cancelled, and the inode is unlocked. Just get out.
738 return VN_INACTIVE_CACHE;
739 } else if (ip->i_afp) {
740 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
746 xfs_bmap_init(&free_list, &first_block);
747 error = xfs_ifree(tp, ip, &free_list);
750 * If we fail to free the inode, shut down. The cancel
751 * might do that, we need to make sure. Otherwise the
752 * inode might be lost for a long time or forever.
754 if (!XFS_FORCED_SHUTDOWN(mp)) {
755 xfs_notice(mp, "%s: xfs_ifree returned error %d",
757 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
759 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
762 * Credit the quota account(s). The inode is gone.
764 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
767 * Just ignore errors at this point. There is nothing we can
768 * do except to try to keep going. Make sure it's not a silent
771 error = xfs_bmap_finish(&tp, &free_list, &committed);
773 xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
775 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
777 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
782 * Release the dquots held by inode, if any.
785 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
788 return VN_INACTIVE_CACHE;
792 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
793 * is allowed, otherwise it has to be an exact match. If a CI match is found,
794 * ci_name->name will point to a the actual name (caller must free) or
795 * will be set to NULL if an exact match is found.
800 struct xfs_name *name,
802 struct xfs_name *ci_name)
808 trace_xfs_lookup(dp, name);
810 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
811 return XFS_ERROR(EIO);
813 lock_mode = xfs_ilock_map_shared(dp);
814 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
815 xfs_iunlock_map_shared(dp, lock_mode);
820 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
828 kmem_free(ci_name->name);
837 struct xfs_name *name,
842 int is_dir = S_ISDIR(mode);
843 struct xfs_mount *mp = dp->i_mount;
844 struct xfs_inode *ip = NULL;
845 struct xfs_trans *tp = NULL;
847 xfs_bmap_free_t free_list;
848 xfs_fsblock_t first_block;
849 boolean_t unlock_dp_on_error = B_FALSE;
853 struct xfs_dquot *udqp = NULL;
854 struct xfs_dquot *gdqp = NULL;
859 trace_xfs_create(dp, name);
861 if (XFS_FORCED_SHUTDOWN(mp))
862 return XFS_ERROR(EIO);
864 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
865 prid = xfs_get_projid(dp);
867 prid = XFS_PROJID_DEFAULT;
870 * Make sure that we have allocated dquot(s) on disk.
872 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
873 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
879 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
880 log_res = XFS_MKDIR_LOG_RES(mp);
881 log_count = XFS_MKDIR_LOG_COUNT;
882 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
884 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
885 log_res = XFS_CREATE_LOG_RES(mp);
886 log_count = XFS_CREATE_LOG_COUNT;
887 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
890 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
893 * Initially assume that the file does not exist and
894 * reserve the resources for that case. If that is not
895 * the case we'll drop the one we have and get a more
896 * appropriate transaction later.
898 error = xfs_trans_reserve(tp, resblks, log_res, 0,
899 XFS_TRANS_PERM_LOG_RES, log_count);
900 if (error == ENOSPC) {
901 /* flush outstanding delalloc blocks and retry */
902 xfs_flush_inodes(dp);
903 error = xfs_trans_reserve(tp, resblks, log_res, 0,
904 XFS_TRANS_PERM_LOG_RES, log_count);
906 if (error == ENOSPC) {
907 /* No space at all so try a "no-allocation" reservation */
909 error = xfs_trans_reserve(tp, 0, log_res, 0,
910 XFS_TRANS_PERM_LOG_RES, log_count);
914 goto out_trans_cancel;
917 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
918 unlock_dp_on_error = B_TRUE;
921 * Check for directory link count overflow.
923 if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) {
924 error = XFS_ERROR(EMLINK);
925 goto out_trans_cancel;
928 xfs_bmap_init(&free_list, &first_block);
931 * Reserve disk quota and the inode.
933 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
935 goto out_trans_cancel;
937 error = xfs_dir_canenter(tp, dp, name, resblks);
939 goto out_trans_cancel;
942 * A newly created regular or special file just has one directory
943 * entry pointing to them, but a directory also the "." entry
944 * pointing to itself.
946 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
947 prid, resblks > 0, &ip, &committed);
950 goto out_trans_cancel;
951 goto out_trans_abort;
955 * Now we join the directory inode to the transaction. We do not do it
956 * earlier because xfs_dir_ialloc might commit the previous transaction
957 * (and release all the locks). An error from here on will result in
958 * the transaction cancel unlocking dp so don't do it explicitly in the
961 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
962 unlock_dp_on_error = B_FALSE;
964 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
965 &first_block, &free_list, resblks ?
966 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
968 ASSERT(error != ENOSPC);
969 goto out_trans_abort;
971 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
972 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
975 error = xfs_dir_init(tp, ip, dp);
977 goto out_bmap_cancel;
979 error = xfs_bumplink(tp, dp);
981 goto out_bmap_cancel;
985 * If this is a synchronous mount, make sure that the
986 * create transaction goes to disk before returning to
989 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
990 xfs_trans_set_sync(tp);
993 * Attach the dquot(s) to the inodes and modify them incore.
994 * These ids of the inode couldn't have changed since the new
995 * inode has been locked ever since it was created.
997 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
999 error = xfs_bmap_finish(&tp, &free_list, &committed);
1001 goto out_bmap_cancel;
1003 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1005 goto out_release_inode;
1007 xfs_qm_dqrele(udqp);
1008 xfs_qm_dqrele(gdqp);
1014 xfs_bmap_cancel(&free_list);
1016 cancel_flags |= XFS_TRANS_ABORT;
1018 xfs_trans_cancel(tp, cancel_flags);
1021 * Wait until after the current transaction is aborted to
1022 * release the inode. This prevents recursive transactions
1023 * and deadlocks from xfs_inactive.
1028 xfs_qm_dqrele(udqp);
1029 xfs_qm_dqrele(gdqp);
1031 if (unlock_dp_on_error)
1032 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1038 int xfs_small_retries;
1039 int xfs_middle_retries;
1040 int xfs_lots_retries;
1041 int xfs_lock_delays;
1045 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1049 xfs_lock_inumorder(int lock_mode, int subclass)
1051 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1052 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
1053 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
1054 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
1060 * The following routine will lock n inodes in exclusive mode.
1061 * We assume the caller calls us with the inodes in i_ino order.
1063 * We need to detect deadlock where an inode that we lock
1064 * is in the AIL and we start waiting for another inode that is locked
1065 * by a thread in a long running transaction (such as truncate). This can
1066 * result in deadlock since the long running trans might need to wait
1067 * for the inode we just locked in order to push the tail and free space
1076 int attempts = 0, i, j, try_lock;
1079 ASSERT(ips && (inodes >= 2)); /* we need at least two */
1085 for (; i < inodes; i++) {
1088 if (i && (ips[i] == ips[i-1])) /* Already locked */
1092 * If try_lock is not set yet, make sure all locked inodes
1093 * are not in the AIL.
1094 * If any are, set try_lock to be used later.
1098 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1099 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1100 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1107 * If any of the previous locks we have locked is in the AIL,
1108 * we must TRY to get the second and subsequent locks. If
1109 * we can't get any, we must release all we have
1114 /* try_lock must be 0 if i is 0. */
1116 * try_lock means we have an inode locked
1117 * that is in the AIL.
1120 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
1124 * Unlock all previous guys and try again.
1125 * xfs_iunlock will try to push the tail
1126 * if the inode is in the AIL.
1129 for(j = i - 1; j >= 0; j--) {
1132 * Check to see if we've already
1133 * unlocked this one.
1134 * Not the first one going back,
1135 * and the inode ptr is the same.
1137 if ((j != (i - 1)) && ips[j] ==
1141 xfs_iunlock(ips[j], lock_mode);
1144 if ((attempts % 5) == 0) {
1145 delay(1); /* Don't just spin the CPU */
1155 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
1161 if (attempts < 5) xfs_small_retries++;
1162 else if (attempts < 100) xfs_middle_retries++;
1163 else xfs_lots_retries++;
1171 * xfs_lock_two_inodes() can only be used to lock one type of lock
1172 * at a time - the iolock or the ilock, but not both at once. If
1173 * we lock both at once, lockdep will report false positives saying
1174 * we have violated locking orders.
1177 xfs_lock_two_inodes(
1186 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1187 ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
1188 ASSERT(ip0->i_ino != ip1->i_ino);
1190 if (ip0->i_ino > ip1->i_ino) {
1197 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1200 * If the first lock we have locked is in the AIL, we must TRY to get
1201 * the second lock. If we can't get it, we must release the first one
1204 lp = (xfs_log_item_t *)ip0->i_itemp;
1205 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1206 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1207 xfs_iunlock(ip0, lock_mode);
1208 if ((++attempts % 5) == 0)
1209 delay(1); /* Don't just spin the CPU */
1213 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1220 struct xfs_name *name,
1223 xfs_mount_t *mp = dp->i_mount;
1224 xfs_trans_t *tp = NULL;
1225 int is_dir = S_ISDIR(ip->i_d.di_mode);
1227 xfs_bmap_free_t free_list;
1228 xfs_fsblock_t first_block;
1235 trace_xfs_remove(dp, name);
1237 if (XFS_FORCED_SHUTDOWN(mp))
1238 return XFS_ERROR(EIO);
1240 error = xfs_qm_dqattach(dp, 0);
1244 error = xfs_qm_dqattach(ip, 0);
1249 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1250 log_count = XFS_DEFAULT_LOG_COUNT;
1252 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1253 log_count = XFS_REMOVE_LOG_COUNT;
1255 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1258 * We try to get the real space reservation first,
1259 * allowing for directory btree deletion(s) implying
1260 * possible bmap insert(s). If we can't get the space
1261 * reservation then we use 0 instead, and avoid the bmap
1262 * btree insert(s) in the directory code by, if the bmap
1263 * insert tries to happen, instead trimming the LAST
1264 * block from the directory.
1266 resblks = XFS_REMOVE_SPACE_RES(mp);
1267 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
1268 XFS_TRANS_PERM_LOG_RES, log_count);
1269 if (error == ENOSPC) {
1271 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
1272 XFS_TRANS_PERM_LOG_RES, log_count);
1275 ASSERT(error != ENOSPC);
1277 goto out_trans_cancel;
1280 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
1282 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1283 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1286 * If we're removing a directory perform some additional validation.
1289 ASSERT(ip->i_d.di_nlink >= 2);
1290 if (ip->i_d.di_nlink != 2) {
1291 error = XFS_ERROR(ENOTEMPTY);
1292 goto out_trans_cancel;
1294 if (!xfs_dir_isempty(ip)) {
1295 error = XFS_ERROR(ENOTEMPTY);
1296 goto out_trans_cancel;
1300 xfs_bmap_init(&free_list, &first_block);
1301 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
1302 &first_block, &free_list, resblks);
1304 ASSERT(error != ENOENT);
1305 goto out_bmap_cancel;
1307 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1311 * Drop the link from ip's "..".
1313 error = xfs_droplink(tp, dp);
1315 goto out_bmap_cancel;
1318 * Drop the "." link from ip to self.
1320 error = xfs_droplink(tp, ip);
1322 goto out_bmap_cancel;
1325 * When removing a non-directory we need to log the parent
1326 * inode here. For a directory this is done implicitly
1327 * by the xfs_droplink call for the ".." entry.
1329 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1333 * Drop the link from dp to ip.
1335 error = xfs_droplink(tp, ip);
1337 goto out_bmap_cancel;
1340 * Determine if this is the last link while
1341 * we are in the transaction.
1343 link_zero = (ip->i_d.di_nlink == 0);
1346 * If this is a synchronous mount, make sure that the
1347 * remove transaction goes to disk before returning to
1350 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1351 xfs_trans_set_sync(tp);
1353 error = xfs_bmap_finish(&tp, &free_list, &committed);
1355 goto out_bmap_cancel;
1357 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1362 * If we are using filestreams, kill the stream association.
1363 * If the file is still open it may get a new one but that
1364 * will get killed on last close in xfs_close() so we don't
1365 * have to worry about that.
1367 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
1368 xfs_filestream_deassociate(ip);
1373 xfs_bmap_cancel(&free_list);
1374 cancel_flags |= XFS_TRANS_ABORT;
1376 xfs_trans_cancel(tp, cancel_flags);
1385 struct xfs_name *target_name)
1387 xfs_mount_t *mp = tdp->i_mount;
1390 xfs_bmap_free_t free_list;
1391 xfs_fsblock_t first_block;
1396 trace_xfs_link(tdp, target_name);
1398 ASSERT(!S_ISDIR(sip->i_d.di_mode));
1400 if (XFS_FORCED_SHUTDOWN(mp))
1401 return XFS_ERROR(EIO);
1403 error = xfs_qm_dqattach(sip, 0);
1407 error = xfs_qm_dqattach(tdp, 0);
1411 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
1412 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1413 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1414 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
1415 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1416 if (error == ENOSPC) {
1418 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
1419 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1426 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
1428 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
1429 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
1432 * If the source has too many links, we can't make any more to it.
1434 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
1435 error = XFS_ERROR(EMLINK);
1440 * If we are using project inheritance, we only allow hard link
1441 * creation in our tree when the project IDs are the same; else
1442 * the tree quota mechanism could be circumvented.
1444 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1445 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
1446 error = XFS_ERROR(EXDEV);
1450 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
1454 xfs_bmap_init(&free_list, &first_block);
1456 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1457 &first_block, &free_list, resblks);
1460 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1461 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1463 error = xfs_bumplink(tp, sip);
1468 * If this is a synchronous mount, make sure that the
1469 * link transaction goes to disk before returning to
1472 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1473 xfs_trans_set_sync(tp);
1476 error = xfs_bmap_finish (&tp, &free_list, &committed);
1478 xfs_bmap_cancel(&free_list);
1482 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1485 cancel_flags |= XFS_TRANS_ABORT;
1487 xfs_trans_cancel(tp, cancel_flags);
1495 struct xfs_name *link_name,
1496 const char *target_path,
1500 xfs_mount_t *mp = dp->i_mount;
1505 xfs_bmap_free_t free_list;
1506 xfs_fsblock_t first_block;
1507 boolean_t unlock_dp_on_error = B_FALSE;
1510 xfs_fileoff_t first_fsb;
1511 xfs_filblks_t fs_blocks;
1513 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1515 const char *cur_chunk;
1520 struct xfs_dquot *udqp, *gdqp;
1528 trace_xfs_symlink(dp, link_name);
1530 if (XFS_FORCED_SHUTDOWN(mp))
1531 return XFS_ERROR(EIO);
1534 * Check component lengths of the target path name.
1536 pathlen = strlen(target_path);
1537 if (pathlen >= MAXPATHLEN) /* total string too long */
1538 return XFS_ERROR(ENAMETOOLONG);
1541 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1542 prid = xfs_get_projid(dp);
1544 prid = XFS_PROJID_DEFAULT;
1547 * Make sure that we have allocated dquot(s) on disk.
1549 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
1550 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
1554 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
1555 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1557 * The symlink will fit into the inode data fork?
1558 * There can't be any attributes so we get the whole variable part.
1560 if (pathlen <= XFS_LITINO(mp))
1563 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
1564 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
1565 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
1566 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1567 if (error == ENOSPC && fs_blocks == 0) {
1569 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
1570 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1577 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1578 unlock_dp_on_error = B_TRUE;
1581 * Check whether the directory allows new symlinks or not.
1583 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
1584 error = XFS_ERROR(EPERM);
1589 * Reserve disk quota : blocks and inode.
1591 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
1596 * Check for ability to enter directory entry, if no space reserved.
1598 error = xfs_dir_canenter(tp, dp, link_name, resblks);
1602 * Initialize the bmap freelist prior to calling either
1603 * bmapi or the directory create code.
1605 xfs_bmap_init(&free_list, &first_block);
1608 * Allocate an inode for the symlink.
1610 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
1611 prid, resblks > 0, &ip, NULL);
1613 if (error == ENOSPC)
1619 * An error after we've joined dp to the transaction will result in the
1620 * transaction cancel unlocking dp so don't do it explicitly in the
1623 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1624 unlock_dp_on_error = B_FALSE;
1627 * Also attach the dquot(s) to it, if applicable.
1629 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
1632 resblks -= XFS_IALLOC_SPACE_RES(mp);
1634 * If the symlink will fit into the inode, write it inline.
1636 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
1637 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
1638 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
1639 ip->i_d.di_size = pathlen;
1642 * The inode was initially created in extent format.
1644 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
1645 ip->i_df.if_flags |= XFS_IFINLINE;
1647 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
1648 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
1652 nmaps = SYMLINK_MAPS;
1654 error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
1655 XFS_BMAPI_METADATA, &first_block, resblks,
1656 mval, &nmaps, &free_list);
1661 resblks -= fs_blocks;
1662 ip->i_d.di_size = pathlen;
1663 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1665 cur_chunk = target_path;
1666 for (n = 0; n < nmaps; n++) {
1667 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
1668 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
1669 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
1670 BTOBB(byte_cnt), 0);
1675 if (pathlen < byte_cnt) {
1678 pathlen -= byte_cnt;
1680 memcpy(bp->b_addr, cur_chunk, byte_cnt);
1681 cur_chunk += byte_cnt;
1683 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
1688 * Create the directory entry for the symlink.
1690 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
1691 &first_block, &free_list, resblks);
1694 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1695 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1698 * If this is a synchronous mount, make sure that the
1699 * symlink transaction goes to disk before returning to
1702 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1703 xfs_trans_set_sync(tp);
1706 error = xfs_bmap_finish(&tp, &free_list, &committed);
1710 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1711 xfs_qm_dqrele(udqp);
1712 xfs_qm_dqrele(gdqp);
1720 xfs_bmap_cancel(&free_list);
1721 cancel_flags |= XFS_TRANS_ABORT;
1723 xfs_trans_cancel(tp, cancel_flags);
1724 xfs_qm_dqrele(udqp);
1725 xfs_qm_dqrele(gdqp);
1727 if (unlock_dp_on_error)
1728 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1739 xfs_mount_t *mp = ip->i_mount;
1743 if (!capable(CAP_SYS_ADMIN))
1744 return XFS_ERROR(EPERM);
1746 if (XFS_FORCED_SHUTDOWN(mp))
1747 return XFS_ERROR(EIO);
1749 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
1750 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
1752 xfs_trans_cancel(tp, 0);
1755 xfs_ilock(ip, XFS_ILOCK_EXCL);
1756 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1758 ip->i_d.di_dmevmask = evmask;
1759 ip->i_d.di_dmstate = state;
1761 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1762 error = xfs_trans_commit(tp, 0);
1768 * xfs_alloc_file_space()
1769 * This routine allocates disk space for the given file.
1771 * If alloc_type == 0, this request is for an ALLOCSP type
1772 * request which will change the file size. In this case, no
1773 * DMAPI event will be generated by the call. A TRUNCATE event
1774 * will be generated later by xfs_setattr.
1776 * If alloc_type != 0, this request is for a RESVSP type
1777 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1778 * lower block boundary byte address is less than the file's
1787 xfs_alloc_file_space(
1794 xfs_mount_t *mp = ip->i_mount;
1796 xfs_filblks_t allocated_fsb;
1797 xfs_filblks_t allocatesize_fsb;
1798 xfs_extlen_t extsz, temp;
1799 xfs_fileoff_t startoffset_fsb;
1800 xfs_fsblock_t firstfsb;
1805 xfs_bmbt_irec_t imaps[1], *imapp;
1806 xfs_bmap_free_t free_list;
1807 uint qblocks, resblks, resrtextents;
1811 trace_xfs_alloc_file_space(ip);
1813 if (XFS_FORCED_SHUTDOWN(mp))
1814 return XFS_ERROR(EIO);
1816 error = xfs_qm_dqattach(ip, 0);
1821 return XFS_ERROR(EINVAL);
1823 rt = XFS_IS_REALTIME_INODE(ip);
1824 extsz = xfs_get_extsz_hint(ip);
1829 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
1830 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
1833 * Allocate file space until done or until there is an error
1835 while (allocatesize_fsb && !error) {
1839 * Determine space reservations for data/realtime.
1841 if (unlikely(extsz)) {
1842 s = startoffset_fsb;
1845 e = startoffset_fsb + allocatesize_fsb;
1846 if ((temp = do_mod(startoffset_fsb, extsz)))
1848 if ((temp = do_mod(e, extsz)))
1852 e = allocatesize_fsb;
1856 * The transaction reservation is limited to a 32-bit block
1857 * count, hence we need to limit the number of blocks we are
1858 * trying to reserve to avoid an overflow. We can't allocate
1859 * more than @nimaps extents, and an extent is limited on disk
1860 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1862 resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
1864 resrtextents = qblocks = resblks;
1865 resrtextents /= mp->m_sb.sb_rextsize;
1866 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
1867 quota_flag = XFS_QMOPT_RES_RTBLKS;
1870 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
1871 quota_flag = XFS_QMOPT_RES_REGBLKS;
1875 * Allocate and setup the transaction.
1877 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
1878 error = xfs_trans_reserve(tp, resblks,
1879 XFS_WRITE_LOG_RES(mp), resrtextents,
1880 XFS_TRANS_PERM_LOG_RES,
1881 XFS_WRITE_LOG_COUNT);
1883 * Check for running out of space
1887 * Free the transaction structure.
1889 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
1890 xfs_trans_cancel(tp, 0);
1893 xfs_ilock(ip, XFS_ILOCK_EXCL);
1894 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
1899 xfs_trans_ijoin(tp, ip, 0);
1901 xfs_bmap_init(&free_list, &firstfsb);
1902 error = xfs_bmapi_write(tp, ip, startoffset_fsb,
1903 allocatesize_fsb, alloc_type, &firstfsb,
1904 0, imapp, &nimaps, &free_list);
1910 * Complete the transaction
1912 error = xfs_bmap_finish(&tp, &free_list, &committed);
1917 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1918 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1923 allocated_fsb = imapp->br_blockcount;
1926 error = XFS_ERROR(ENOSPC);
1930 startoffset_fsb += allocated_fsb;
1931 allocatesize_fsb -= allocated_fsb;
1936 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1937 xfs_bmap_cancel(&free_list);
1938 xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
1940 error1: /* Just cancel transaction */
1941 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1942 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1947 * Zero file bytes between startoff and endoff inclusive.
1948 * The iolock is held exclusive and no blocks are buffered.
1950 * This function is used by xfs_free_file_space() to zero
1951 * partial blocks when the range to free is not block aligned.
1952 * When unreserving space with boundaries that are not block
1953 * aligned we round up the start and round down the end
1954 * boundaries and then use this function to zero the parts of
1955 * the blocks that got dropped during the rounding.
1958 xfs_zero_remaining_bytes(
1963 xfs_bmbt_irec_t imap;
1964 xfs_fileoff_t offset_fsb;
1965 xfs_off_t lastoffset;
1968 xfs_mount_t *mp = ip->i_mount;
1973 * Avoid doing I/O beyond eof - it's not necessary
1974 * since nothing can read beyond eof. The space will
1975 * be zeroed when the file is extended anyway.
1977 if (startoff >= XFS_ISIZE(ip))
1980 if (endoff > XFS_ISIZE(ip))
1981 endoff = XFS_ISIZE(ip);
1983 bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
1984 mp->m_rtdev_targp : mp->m_ddev_targp,
1985 mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
1987 return XFS_ERROR(ENOMEM);
1991 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
1992 offset_fsb = XFS_B_TO_FSBT(mp, offset);
1994 error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
1995 if (error || nimap < 1)
1997 ASSERT(imap.br_blockcount >= 1);
1998 ASSERT(imap.br_startoff == offset_fsb);
1999 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
2000 if (lastoffset > endoff)
2001 lastoffset = endoff;
2002 if (imap.br_startblock == HOLESTARTBLOCK)
2004 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2005 if (imap.br_state == XFS_EXT_UNWRITTEN)
2008 XFS_BUF_UNWRITE(bp);
2010 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
2012 error = xfs_buf_iowait(bp);
2014 xfs_buf_ioerror_alert(bp,
2015 "xfs_zero_remaining_bytes(read)");
2019 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
2020 0, lastoffset - offset + 1);
2025 error = xfs_buf_iowait(bp);
2027 xfs_buf_ioerror_alert(bp,
2028 "xfs_zero_remaining_bytes(write)");
2037 * xfs_free_file_space()
2038 * This routine frees disk space for the given file.
2040 * This routine is only called by xfs_change_file_space
2041 * for an UNRESVSP type call.
2049 xfs_free_file_space(
2057 xfs_fileoff_t endoffset_fsb;
2059 xfs_fsblock_t firstfsb;
2060 xfs_bmap_free_t free_list;
2061 xfs_bmbt_irec_t imap;
2069 xfs_fileoff_t startoffset_fsb;
2071 int need_iolock = 1;
2075 trace_xfs_free_file_space(ip);
2077 error = xfs_qm_dqattach(ip, 0);
2082 if (len <= 0) /* if nothing being freed */
2084 rt = XFS_IS_REALTIME_INODE(ip);
2085 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
2086 endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
2088 if (attr_flags & XFS_ATTR_NOLOCK)
2091 xfs_ilock(ip, XFS_IOLOCK_EXCL);
2092 /* wait for the completion of any pending DIOs */
2093 inode_dio_wait(VFS_I(ip));
2096 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
2097 ioffset = offset & ~(rounding - 1);
2099 if (VN_CACHED(VFS_I(ip)) != 0) {
2100 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
2102 goto out_unlock_iolock;
2106 * Need to zero the stuff we're not freeing, on disk.
2107 * If it's a realtime file & can't use unwritten extents then we
2108 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2109 * will take care of it for us.
2111 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
2113 error = xfs_bmapi_read(ip, startoffset_fsb, 1,
2116 goto out_unlock_iolock;
2117 ASSERT(nimap == 0 || nimap == 1);
2118 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2121 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2122 block = imap.br_startblock;
2123 mod = do_div(block, mp->m_sb.sb_rextsize);
2125 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
2128 error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
2131 goto out_unlock_iolock;
2132 ASSERT(nimap == 0 || nimap == 1);
2133 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2134 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2136 if (mod && (mod != mp->m_sb.sb_rextsize))
2137 endoffset_fsb -= mod;
2140 if ((done = (endoffset_fsb <= startoffset_fsb)))
2142 * One contiguous piece to clear
2144 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
2147 * Some full blocks, possibly two pieces to clear
2149 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
2150 error = xfs_zero_remaining_bytes(ip, offset,
2151 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
2153 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
2154 error = xfs_zero_remaining_bytes(ip,
2155 XFS_FSB_TO_B(mp, endoffset_fsb),
2160 * free file space until done or until there is an error
2162 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2163 while (!error && !done) {
2166 * allocate and setup the transaction. Allow this
2167 * transaction to dip into the reserve blocks to ensure
2168 * the freeing of the space succeeds at ENOSPC.
2170 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
2171 tp->t_flags |= XFS_TRANS_RESERVE;
2172 error = xfs_trans_reserve(tp,
2174 XFS_WRITE_LOG_RES(mp),
2176 XFS_TRANS_PERM_LOG_RES,
2177 XFS_WRITE_LOG_COUNT);
2180 * check for running out of space
2184 * Free the transaction structure.
2186 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2187 xfs_trans_cancel(tp, 0);
2190 xfs_ilock(ip, XFS_ILOCK_EXCL);
2191 error = xfs_trans_reserve_quota(tp, mp,
2192 ip->i_udquot, ip->i_gdquot,
2193 resblks, 0, XFS_QMOPT_RES_REGBLKS);
2197 xfs_trans_ijoin(tp, ip, 0);
2200 * issue the bunmapi() call to free the blocks
2202 xfs_bmap_init(&free_list, &firstfsb);
2203 error = xfs_bunmapi(tp, ip, startoffset_fsb,
2204 endoffset_fsb - startoffset_fsb,
2205 0, 2, &firstfsb, &free_list, &done);
2211 * complete the transaction
2213 error = xfs_bmap_finish(&tp, &free_list, &committed);
2218 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2219 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2224 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2228 xfs_bmap_cancel(&free_list);
2230 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2231 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
2237 * xfs_change_file_space()
2238 * This routine allocates or frees disk space for the given file.
2239 * The user specified parameters are checked for alignment and size
2248 xfs_change_file_space(
2255 xfs_mount_t *mp = ip->i_mount;
2260 xfs_off_t startoffset;
2266 if (!S_ISREG(ip->i_d.di_mode))
2267 return XFS_ERROR(EINVAL);
2269 switch (bf->l_whence) {
2270 case 0: /*SEEK_SET*/
2272 case 1: /*SEEK_CUR*/
2273 bf->l_start += offset;
2275 case 2: /*SEEK_END*/
2276 bf->l_start += XFS_ISIZE(ip);
2279 return XFS_ERROR(EINVAL);
2282 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
2284 if ( (bf->l_start < 0)
2285 || (bf->l_start > XFS_MAXIOFFSET(mp))
2286 || (bf->l_start + llen < 0)
2287 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
2288 return XFS_ERROR(EINVAL);
2292 startoffset = bf->l_start;
2293 fsize = XFS_ISIZE(ip);
2296 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2298 * These calls do NOT zero the data space allocated to the file,
2299 * nor do they change the file size.
2301 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2303 * These calls cause the new file data to be zeroed and the file
2304 * size to be changed.
2306 setprealloc = clrprealloc = 0;
2307 prealloc_type = XFS_BMAPI_PREALLOC;
2310 case XFS_IOC_ZERO_RANGE:
2311 prealloc_type |= XFS_BMAPI_CONVERT;
2312 xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
2314 case XFS_IOC_RESVSP:
2315 case XFS_IOC_RESVSP64:
2316 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
2317 prealloc_type, attr_flags);
2323 case XFS_IOC_UNRESVSP:
2324 case XFS_IOC_UNRESVSP64:
2325 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
2330 case XFS_IOC_ALLOCSP:
2331 case XFS_IOC_ALLOCSP64:
2332 case XFS_IOC_FREESP:
2333 case XFS_IOC_FREESP64:
2334 if (startoffset > fsize) {
2335 error = xfs_alloc_file_space(ip, fsize,
2336 startoffset - fsize, 0, attr_flags);
2341 iattr.ia_valid = ATTR_SIZE;
2342 iattr.ia_size = startoffset;
2344 error = xfs_setattr_size(ip, &iattr, attr_flags);
2354 return XFS_ERROR(EINVAL);
2358 * update the inode timestamp, mode, and prealloc flag bits
2360 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
2362 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
2365 xfs_trans_cancel(tp, 0);
2369 xfs_ilock(ip, XFS_ILOCK_EXCL);
2370 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2372 if ((attr_flags & XFS_ATTR_DMI) == 0) {
2373 ip->i_d.di_mode &= ~S_ISUID;
2376 * Note that we don't have to worry about mandatory
2377 * file locking being disabled here because we only
2378 * clear the S_ISGID bit if the Group execute bit is
2379 * on, but if it was on then mandatory locking wouldn't
2380 * have been enabled.
2382 if (ip->i_d.di_mode & S_IXGRP)
2383 ip->i_d.di_mode &= ~S_ISGID;
2385 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2388 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
2389 else if (clrprealloc)
2390 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
2392 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2393 if (attr_flags & XFS_ATTR_SYNC)
2394 xfs_trans_set_sync(tp);
2395 return xfs_trans_commit(tp, 0);