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 return XFS_ERROR(EFSCORRUPTED);
138 if (ip->i_df.if_flags & XFS_IFINLINE) {
139 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
140 link[pathlen] = '\0';
142 error = xfs_readlink_bmap(ip, link);
146 xfs_iunlock(ip, XFS_ILOCK_SHARED);
151 * Flags for xfs_free_eofblocks
153 #define XFS_FREE_EOF_TRYLOCK (1<<0)
156 * This is called by xfs_inactive to free any blocks beyond eof
157 * when the link count isn't zero and by xfs_dm_punch_hole() when
158 * punching a hole to EOF.
168 xfs_fileoff_t end_fsb;
169 xfs_fileoff_t last_fsb;
170 xfs_filblks_t map_len;
172 xfs_bmbt_irec_t imap;
175 * Figure out if there are any blocks beyond the end
176 * of the file. If not, then there is nothing to do.
178 end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
179 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
180 if (last_fsb <= end_fsb)
182 map_len = last_fsb - end_fsb;
185 xfs_ilock(ip, XFS_ILOCK_SHARED);
186 error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
187 xfs_iunlock(ip, XFS_ILOCK_SHARED);
189 if (!error && (nimaps != 0) &&
190 (imap.br_startblock != HOLESTARTBLOCK ||
191 ip->i_delayed_blks)) {
193 * Attach the dquots to the inode up front.
195 error = xfs_qm_dqattach(ip, 0);
200 * There are blocks after the end of file.
201 * Free them up now by truncating the file to
204 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
206 if (flags & XFS_FREE_EOF_TRYLOCK) {
207 if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
208 xfs_trans_cancel(tp, 0);
212 xfs_ilock(ip, XFS_IOLOCK_EXCL);
215 error = xfs_trans_reserve(tp, 0,
216 XFS_ITRUNCATE_LOG_RES(mp),
217 0, XFS_TRANS_PERM_LOG_RES,
218 XFS_ITRUNCATE_LOG_COUNT);
220 ASSERT(XFS_FORCED_SHUTDOWN(mp));
221 xfs_trans_cancel(tp, 0);
222 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
226 xfs_ilock(ip, XFS_ILOCK_EXCL);
227 xfs_trans_ijoin(tp, ip, 0);
229 error = xfs_itruncate_data(&tp, ip, ip->i_size);
232 * If we get an error at this point we simply don't
233 * bother truncating the file.
236 (XFS_TRANS_RELEASE_LOG_RES |
239 error = xfs_trans_commit(tp,
240 XFS_TRANS_RELEASE_LOG_RES);
242 xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
248 * Free a symlink that has blocks associated with it.
251 xfs_inactive_symlink_rmt(
259 xfs_fsblock_t first_block;
260 xfs_bmap_free_t free_list;
263 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
271 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
273 * We're freeing a symlink that has some
274 * blocks allocated to it. Free the
275 * blocks here. We know that we've got
276 * either 1 or 2 extents and that we can
277 * free them all in one bunmapi call.
279 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
280 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
281 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
282 ASSERT(XFS_FORCED_SHUTDOWN(mp));
283 xfs_trans_cancel(tp, 0);
288 * Lock the inode, fix the size, and join it to the transaction.
289 * Hold it so in the normal path, we still have it locked for
290 * the second transaction. In the error paths we need it
291 * held so the cancel won't rele it, see below.
293 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
294 size = (int)ip->i_d.di_size;
296 xfs_trans_ijoin(tp, ip, 0);
297 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
299 * Find the block(s) so we can inval and unmap them.
302 xfs_bmap_init(&free_list, &first_block);
303 nmaps = ARRAY_SIZE(mval);
304 error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
309 * Invalidate the block(s).
311 for (i = 0; i < nmaps; i++) {
312 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
313 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
314 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
319 xfs_trans_binval(tp, bp);
322 * Unmap the dead block(s) to the free_list.
324 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
325 &first_block, &free_list, &done)))
329 * Commit the first transaction. This logs the EFI and the inode.
331 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
334 * The transaction must have been committed, since there were
335 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
336 * The new tp has the extent freeing and EFDs.
340 * The first xact was committed, so add the inode to the new one.
341 * Mark it dirty so it will be logged and moved forward in the log as
342 * part of every commit.
344 xfs_trans_ijoin(tp, ip, 0);
345 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
347 * Get a new, empty transaction to return to our caller.
349 ntp = xfs_trans_dup(tp);
351 * Commit the transaction containing extent freeing and EFDs.
352 * If we get an error on the commit here or on the reserve below,
353 * we need to unlock the inode since the new transaction doesn't
354 * have the inode attached.
356 error = xfs_trans_commit(tp, 0);
359 ASSERT(XFS_FORCED_SHUTDOWN(mp));
363 * transaction commit worked ok so we can drop the extra ticket
364 * reference that we gained in xfs_trans_dup()
366 xfs_log_ticket_put(tp->t_ticket);
369 * Remove the memory for extent descriptions (just bookkeeping).
371 if (ip->i_df.if_bytes)
372 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
373 ASSERT(ip->i_df.if_bytes == 0);
375 * Put an itruncate log reservation in the new transaction
378 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
379 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
380 ASSERT(XFS_FORCED_SHUTDOWN(mp));
384 * Return with the inode locked but not joined to the transaction.
390 xfs_bmap_cancel(&free_list);
393 * Have to come here with the inode locked and either
394 * (held and in the transaction) or (not in the transaction).
395 * If the inode isn't held then cancel would iput it, but
396 * that's wrong since this is inactive and the vnode ref
397 * count is 0 already.
398 * Cancel won't do anything to the inode if held, but it still
399 * needs to be locked until the cancel is done, if it was
400 * joined to the transaction.
402 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
403 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
410 xfs_inactive_symlink_local(
416 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
418 * We're freeing a symlink which fit into
419 * the inode. Just free the memory used
420 * to hold the old symlink.
422 error = xfs_trans_reserve(*tpp, 0,
423 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
424 0, XFS_TRANS_PERM_LOG_RES,
425 XFS_ITRUNCATE_LOG_COUNT);
428 xfs_trans_cancel(*tpp, 0);
432 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
435 * Zero length symlinks _can_ exist.
437 if (ip->i_df.if_bytes > 0) {
438 xfs_idata_realloc(ip,
439 -(ip->i_df.if_bytes),
441 ASSERT(ip->i_df.if_bytes == 0);
455 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
458 ASSERT(ip->i_d.di_forkoff != 0);
459 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
460 xfs_iunlock(ip, XFS_ILOCK_EXCL);
464 error = xfs_attr_inactive(ip);
468 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
469 error = xfs_trans_reserve(tp, 0,
470 XFS_IFREE_LOG_RES(mp),
471 0, XFS_TRANS_PERM_LOG_RES,
472 XFS_INACTIVE_LOG_COUNT);
476 xfs_ilock(ip, XFS_ILOCK_EXCL);
477 xfs_trans_ijoin(tp, ip, 0);
478 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
480 ASSERT(ip->i_d.di_anextents == 0);
486 ASSERT(XFS_FORCED_SHUTDOWN(mp));
487 xfs_trans_cancel(tp, 0);
490 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
498 xfs_mount_t *mp = ip->i_mount;
501 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
504 /* If this is a read-only mount, don't do this (would generate I/O) */
505 if (mp->m_flags & XFS_MOUNT_RDONLY)
508 if (!XFS_FORCED_SHUTDOWN(mp)) {
512 * If we are using filestreams, and we have an unlinked
513 * file that we are processing the last close on, then nothing
514 * will be able to reopen and write to this file. Purge this
515 * inode from the filestreams cache so that it doesn't delay
516 * teardown of the inode.
518 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
519 xfs_filestream_deassociate(ip);
522 * If we previously truncated this file and removed old data
523 * in the process, we want to initiate "early" writeout on
524 * the last close. This is an attempt to combat the notorious
525 * NULL files problem which is particularly noticeable from a
526 * truncate down, buffered (re-)write (delalloc), followed by
527 * a crash. What we are effectively doing here is
528 * significantly reducing the time window where we'd otherwise
529 * be exposed to that problem.
531 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
533 xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
534 if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
535 xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
539 if (ip->i_d.di_nlink == 0)
542 if ((S_ISREG(ip->i_d.di_mode) &&
543 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
544 ip->i_delayed_blks > 0)) &&
545 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
546 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
549 * If we can't get the iolock just skip truncating the blocks
550 * past EOF because we could deadlock with the mmap_sem
551 * otherwise. We'll get another chance to drop them once the
552 * last reference to the inode is dropped, so we'll never leak
553 * blocks permanently.
555 * Further, check if the inode is being opened, written and
556 * closed frequently and we have delayed allocation blocks
557 * outstanding (e.g. streaming writes from the NFS server),
558 * truncating the blocks past EOF will cause fragmentation to
561 * In this case don't do the truncation, either, but we have to
562 * be careful how we detect this case. Blocks beyond EOF show
563 * up as i_delayed_blks even when the inode is clean, so we
564 * need to truncate them away first before checking for a dirty
565 * release. Hence on the first dirty close we will still remove
566 * the speculative allocation, but after that we will leave it
569 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
572 error = xfs_free_eofblocks(mp, ip,
573 XFS_FREE_EOF_TRYLOCK);
577 /* delalloc blocks after truncation means it really is dirty */
578 if (ip->i_delayed_blks)
579 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
587 * This is called when the vnode reference count for the vnode
588 * goes to zero. If the file has been unlinked, then it must
589 * now be truncated. Also, we clear all of the read-ahead state
590 * kept for the inode here since the file is now closed.
596 xfs_bmap_free_t free_list;
597 xfs_fsblock_t first_block;
605 * If the inode is already free, then there can be nothing
608 if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
609 ASSERT(ip->i_df.if_real_bytes == 0);
610 ASSERT(ip->i_df.if_broot_bytes == 0);
611 return VN_INACTIVE_CACHE;
615 * Only do a truncate if it's a regular file with
616 * some actual space in it. It's OK to look at the
617 * inode's fields without the lock because we're the
618 * only one with a reference to the inode.
620 truncate = ((ip->i_d.di_nlink == 0) &&
621 ((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
622 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
623 S_ISREG(ip->i_d.di_mode));
629 /* If this is a read-only mount, don't do this (would generate I/O) */
630 if (mp->m_flags & XFS_MOUNT_RDONLY)
633 if (ip->i_d.di_nlink != 0) {
634 if ((S_ISREG(ip->i_d.di_mode) &&
635 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
636 ip->i_delayed_blks > 0)) &&
637 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
638 (!(ip->i_d.di_flags &
639 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
640 (ip->i_delayed_blks != 0)))) {
641 error = xfs_free_eofblocks(mp, ip, 0);
643 return VN_INACTIVE_CACHE;
648 ASSERT(ip->i_d.di_nlink == 0);
650 error = xfs_qm_dqattach(ip, 0);
652 return VN_INACTIVE_CACHE;
654 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
656 xfs_ilock(ip, XFS_IOLOCK_EXCL);
658 error = xfs_trans_reserve(tp, 0,
659 XFS_ITRUNCATE_LOG_RES(mp),
660 0, XFS_TRANS_PERM_LOG_RES,
661 XFS_ITRUNCATE_LOG_COUNT);
663 /* Don't call itruncate_cleanup */
664 ASSERT(XFS_FORCED_SHUTDOWN(mp));
665 xfs_trans_cancel(tp, 0);
666 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
667 return VN_INACTIVE_CACHE;
670 xfs_ilock(ip, XFS_ILOCK_EXCL);
671 xfs_trans_ijoin(tp, ip, 0);
673 error = xfs_itruncate_data(&tp, ip, 0);
676 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
677 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
678 return VN_INACTIVE_CACHE;
680 } else if (S_ISLNK(ip->i_d.di_mode)) {
683 * If we get an error while cleaning up a
684 * symlink we bail out.
686 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
687 xfs_inactive_symlink_rmt(ip, &tp) :
688 xfs_inactive_symlink_local(ip, &tp);
692 return VN_INACTIVE_CACHE;
695 xfs_trans_ijoin(tp, ip, 0);
697 error = xfs_trans_reserve(tp, 0,
698 XFS_IFREE_LOG_RES(mp),
699 0, XFS_TRANS_PERM_LOG_RES,
700 XFS_INACTIVE_LOG_COUNT);
702 ASSERT(XFS_FORCED_SHUTDOWN(mp));
703 xfs_trans_cancel(tp, 0);
704 return VN_INACTIVE_CACHE;
707 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
708 xfs_trans_ijoin(tp, ip, 0);
712 * If there are attributes associated with the file
713 * then blow them away now. The code calls a routine
714 * that recursively deconstructs the attribute fork.
715 * We need to just commit the current transaction
716 * because we can't use it for xfs_attr_inactive().
718 if (ip->i_d.di_anextents > 0) {
719 error = xfs_inactive_attrs(ip, &tp);
721 * If we got an error, the transaction is already
722 * cancelled, and the inode is unlocked. Just get out.
725 return VN_INACTIVE_CACHE;
726 } else if (ip->i_afp) {
727 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
733 xfs_bmap_init(&free_list, &first_block);
734 error = xfs_ifree(tp, ip, &free_list);
737 * If we fail to free the inode, shut down. The cancel
738 * might do that, we need to make sure. Otherwise the
739 * inode might be lost for a long time or forever.
741 if (!XFS_FORCED_SHUTDOWN(mp)) {
742 xfs_notice(mp, "%s: xfs_ifree returned error %d",
744 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
746 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
749 * Credit the quota account(s). The inode is gone.
751 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
754 * Just ignore errors at this point. There is nothing we can
755 * do except to try to keep going. Make sure it's not a silent
758 error = xfs_bmap_finish(&tp, &free_list, &committed);
760 xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
762 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
764 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
769 * Release the dquots held by inode, if any.
772 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
775 return VN_INACTIVE_CACHE;
779 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
780 * is allowed, otherwise it has to be an exact match. If a CI match is found,
781 * ci_name->name will point to a the actual name (caller must free) or
782 * will be set to NULL if an exact match is found.
787 struct xfs_name *name,
789 struct xfs_name *ci_name)
795 trace_xfs_lookup(dp, name);
797 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
798 return XFS_ERROR(EIO);
800 lock_mode = xfs_ilock_map_shared(dp);
801 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
802 xfs_iunlock_map_shared(dp, lock_mode);
807 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
815 kmem_free(ci_name->name);
824 struct xfs_name *name,
829 int is_dir = S_ISDIR(mode);
830 struct xfs_mount *mp = dp->i_mount;
831 struct xfs_inode *ip = NULL;
832 struct xfs_trans *tp = NULL;
834 xfs_bmap_free_t free_list;
835 xfs_fsblock_t first_block;
836 boolean_t unlock_dp_on_error = B_FALSE;
840 struct xfs_dquot *udqp = NULL;
841 struct xfs_dquot *gdqp = NULL;
846 trace_xfs_create(dp, name);
848 if (XFS_FORCED_SHUTDOWN(mp))
849 return XFS_ERROR(EIO);
851 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
852 prid = xfs_get_projid(dp);
854 prid = XFS_PROJID_DEFAULT;
857 * Make sure that we have allocated dquot(s) on disk.
859 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
860 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
866 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
867 log_res = XFS_MKDIR_LOG_RES(mp);
868 log_count = XFS_MKDIR_LOG_COUNT;
869 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
871 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
872 log_res = XFS_CREATE_LOG_RES(mp);
873 log_count = XFS_CREATE_LOG_COUNT;
874 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
877 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
880 * Initially assume that the file does not exist and
881 * reserve the resources for that case. If that is not
882 * the case we'll drop the one we have and get a more
883 * appropriate transaction later.
885 error = xfs_trans_reserve(tp, resblks, log_res, 0,
886 XFS_TRANS_PERM_LOG_RES, log_count);
887 if (error == ENOSPC) {
888 /* flush outstanding delalloc blocks and retry */
889 xfs_flush_inodes(dp);
890 error = xfs_trans_reserve(tp, resblks, log_res, 0,
891 XFS_TRANS_PERM_LOG_RES, log_count);
893 if (error == ENOSPC) {
894 /* No space at all so try a "no-allocation" reservation */
896 error = xfs_trans_reserve(tp, 0, log_res, 0,
897 XFS_TRANS_PERM_LOG_RES, log_count);
901 goto out_trans_cancel;
904 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
905 unlock_dp_on_error = B_TRUE;
908 * Check for directory link count overflow.
910 if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) {
911 error = XFS_ERROR(EMLINK);
912 goto out_trans_cancel;
915 xfs_bmap_init(&free_list, &first_block);
918 * Reserve disk quota and the inode.
920 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
922 goto out_trans_cancel;
924 error = xfs_dir_canenter(tp, dp, name, resblks);
926 goto out_trans_cancel;
929 * A newly created regular or special file just has one directory
930 * entry pointing to them, but a directory also the "." entry
931 * pointing to itself.
933 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
934 prid, resblks > 0, &ip, &committed);
937 goto out_trans_cancel;
938 goto out_trans_abort;
942 * Now we join the directory inode to the transaction. We do not do it
943 * earlier because xfs_dir_ialloc might commit the previous transaction
944 * (and release all the locks). An error from here on will result in
945 * the transaction cancel unlocking dp so don't do it explicitly in the
948 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
949 unlock_dp_on_error = B_FALSE;
951 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
952 &first_block, &free_list, resblks ?
953 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
955 ASSERT(error != ENOSPC);
956 goto out_trans_abort;
958 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
959 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
962 error = xfs_dir_init(tp, ip, dp);
964 goto out_bmap_cancel;
966 error = xfs_bumplink(tp, dp);
968 goto out_bmap_cancel;
972 * If this is a synchronous mount, make sure that the
973 * create transaction goes to disk before returning to
976 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
977 xfs_trans_set_sync(tp);
980 * Attach the dquot(s) to the inodes and modify them incore.
981 * These ids of the inode couldn't have changed since the new
982 * inode has been locked ever since it was created.
984 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
986 error = xfs_bmap_finish(&tp, &free_list, &committed);
988 goto out_bmap_cancel;
990 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
992 goto out_release_inode;
1001 xfs_bmap_cancel(&free_list);
1003 cancel_flags |= XFS_TRANS_ABORT;
1005 xfs_trans_cancel(tp, cancel_flags);
1008 * Wait until after the current transaction is aborted to
1009 * release the inode. This prevents recursive transactions
1010 * and deadlocks from xfs_inactive.
1015 xfs_qm_dqrele(udqp);
1016 xfs_qm_dqrele(gdqp);
1018 if (unlock_dp_on_error)
1019 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1025 int xfs_small_retries;
1026 int xfs_middle_retries;
1027 int xfs_lots_retries;
1028 int xfs_lock_delays;
1032 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1036 xfs_lock_inumorder(int lock_mode, int subclass)
1038 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1039 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
1040 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
1041 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
1047 * The following routine will lock n inodes in exclusive mode.
1048 * We assume the caller calls us with the inodes in i_ino order.
1050 * We need to detect deadlock where an inode that we lock
1051 * is in the AIL and we start waiting for another inode that is locked
1052 * by a thread in a long running transaction (such as truncate). This can
1053 * result in deadlock since the long running trans might need to wait
1054 * for the inode we just locked in order to push the tail and free space
1063 int attempts = 0, i, j, try_lock;
1066 ASSERT(ips && (inodes >= 2)); /* we need at least two */
1072 for (; i < inodes; i++) {
1075 if (i && (ips[i] == ips[i-1])) /* Already locked */
1079 * If try_lock is not set yet, make sure all locked inodes
1080 * are not in the AIL.
1081 * If any are, set try_lock to be used later.
1085 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1086 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1087 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1094 * If any of the previous locks we have locked is in the AIL,
1095 * we must TRY to get the second and subsequent locks. If
1096 * we can't get any, we must release all we have
1101 /* try_lock must be 0 if i is 0. */
1103 * try_lock means we have an inode locked
1104 * that is in the AIL.
1107 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
1111 * Unlock all previous guys and try again.
1112 * xfs_iunlock will try to push the tail
1113 * if the inode is in the AIL.
1116 for(j = i - 1; j >= 0; j--) {
1119 * Check to see if we've already
1120 * unlocked this one.
1121 * Not the first one going back,
1122 * and the inode ptr is the same.
1124 if ((j != (i - 1)) && ips[j] ==
1128 xfs_iunlock(ips[j], lock_mode);
1131 if ((attempts % 5) == 0) {
1132 delay(1); /* Don't just spin the CPU */
1142 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
1148 if (attempts < 5) xfs_small_retries++;
1149 else if (attempts < 100) xfs_middle_retries++;
1150 else xfs_lots_retries++;
1158 * xfs_lock_two_inodes() can only be used to lock one type of lock
1159 * at a time - the iolock or the ilock, but not both at once. If
1160 * we lock both at once, lockdep will report false positives saying
1161 * we have violated locking orders.
1164 xfs_lock_two_inodes(
1173 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1174 ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
1175 ASSERT(ip0->i_ino != ip1->i_ino);
1177 if (ip0->i_ino > ip1->i_ino) {
1184 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1187 * If the first lock we have locked is in the AIL, we must TRY to get
1188 * the second lock. If we can't get it, we must release the first one
1191 lp = (xfs_log_item_t *)ip0->i_itemp;
1192 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1193 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1194 xfs_iunlock(ip0, lock_mode);
1195 if ((++attempts % 5) == 0)
1196 delay(1); /* Don't just spin the CPU */
1200 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1207 struct xfs_name *name,
1210 xfs_mount_t *mp = dp->i_mount;
1211 xfs_trans_t *tp = NULL;
1212 int is_dir = S_ISDIR(ip->i_d.di_mode);
1214 xfs_bmap_free_t free_list;
1215 xfs_fsblock_t first_block;
1222 trace_xfs_remove(dp, name);
1224 if (XFS_FORCED_SHUTDOWN(mp))
1225 return XFS_ERROR(EIO);
1227 error = xfs_qm_dqattach(dp, 0);
1231 error = xfs_qm_dqattach(ip, 0);
1236 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1237 log_count = XFS_DEFAULT_LOG_COUNT;
1239 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1240 log_count = XFS_REMOVE_LOG_COUNT;
1242 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1245 * We try to get the real space reservation first,
1246 * allowing for directory btree deletion(s) implying
1247 * possible bmap insert(s). If we can't get the space
1248 * reservation then we use 0 instead, and avoid the bmap
1249 * btree insert(s) in the directory code by, if the bmap
1250 * insert tries to happen, instead trimming the LAST
1251 * block from the directory.
1253 resblks = XFS_REMOVE_SPACE_RES(mp);
1254 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
1255 XFS_TRANS_PERM_LOG_RES, log_count);
1256 if (error == ENOSPC) {
1258 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
1259 XFS_TRANS_PERM_LOG_RES, log_count);
1262 ASSERT(error != ENOSPC);
1264 goto out_trans_cancel;
1267 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
1269 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1270 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1273 * If we're removing a directory perform some additional validation.
1276 ASSERT(ip->i_d.di_nlink >= 2);
1277 if (ip->i_d.di_nlink != 2) {
1278 error = XFS_ERROR(ENOTEMPTY);
1279 goto out_trans_cancel;
1281 if (!xfs_dir_isempty(ip)) {
1282 error = XFS_ERROR(ENOTEMPTY);
1283 goto out_trans_cancel;
1287 xfs_bmap_init(&free_list, &first_block);
1288 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
1289 &first_block, &free_list, resblks);
1291 ASSERT(error != ENOENT);
1292 goto out_bmap_cancel;
1294 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1298 * Drop the link from ip's "..".
1300 error = xfs_droplink(tp, dp);
1302 goto out_bmap_cancel;
1305 * Drop the "." link from ip to self.
1307 error = xfs_droplink(tp, ip);
1309 goto out_bmap_cancel;
1312 * When removing a non-directory we need to log the parent
1313 * inode here. For a directory this is done implicitly
1314 * by the xfs_droplink call for the ".." entry.
1316 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1320 * Drop the link from dp to ip.
1322 error = xfs_droplink(tp, ip);
1324 goto out_bmap_cancel;
1327 * Determine if this is the last link while
1328 * we are in the transaction.
1330 link_zero = (ip->i_d.di_nlink == 0);
1333 * If this is a synchronous mount, make sure that the
1334 * remove transaction goes to disk before returning to
1337 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1338 xfs_trans_set_sync(tp);
1340 error = xfs_bmap_finish(&tp, &free_list, &committed);
1342 goto out_bmap_cancel;
1344 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1349 * If we are using filestreams, kill the stream association.
1350 * If the file is still open it may get a new one but that
1351 * will get killed on last close in xfs_close() so we don't
1352 * have to worry about that.
1354 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
1355 xfs_filestream_deassociate(ip);
1360 xfs_bmap_cancel(&free_list);
1361 cancel_flags |= XFS_TRANS_ABORT;
1363 xfs_trans_cancel(tp, cancel_flags);
1372 struct xfs_name *target_name)
1374 xfs_mount_t *mp = tdp->i_mount;
1377 xfs_bmap_free_t free_list;
1378 xfs_fsblock_t first_block;
1383 trace_xfs_link(tdp, target_name);
1385 ASSERT(!S_ISDIR(sip->i_d.di_mode));
1387 if (XFS_FORCED_SHUTDOWN(mp))
1388 return XFS_ERROR(EIO);
1390 error = xfs_qm_dqattach(sip, 0);
1394 error = xfs_qm_dqattach(tdp, 0);
1398 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
1399 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1400 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1401 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
1402 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1403 if (error == ENOSPC) {
1405 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
1406 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1413 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
1415 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
1416 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
1419 * If the source has too many links, we can't make any more to it.
1421 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
1422 error = XFS_ERROR(EMLINK);
1427 * If we are using project inheritance, we only allow hard link
1428 * creation in our tree when the project IDs are the same; else
1429 * the tree quota mechanism could be circumvented.
1431 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1432 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
1433 error = XFS_ERROR(EXDEV);
1437 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
1441 xfs_bmap_init(&free_list, &first_block);
1443 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1444 &first_block, &free_list, resblks);
1447 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1448 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1450 error = xfs_bumplink(tp, sip);
1455 * If this is a synchronous mount, make sure that the
1456 * link transaction goes to disk before returning to
1459 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1460 xfs_trans_set_sync(tp);
1463 error = xfs_bmap_finish (&tp, &free_list, &committed);
1465 xfs_bmap_cancel(&free_list);
1469 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1472 cancel_flags |= XFS_TRANS_ABORT;
1474 xfs_trans_cancel(tp, cancel_flags);
1482 struct xfs_name *link_name,
1483 const char *target_path,
1487 xfs_mount_t *mp = dp->i_mount;
1492 xfs_bmap_free_t free_list;
1493 xfs_fsblock_t first_block;
1494 boolean_t unlock_dp_on_error = B_FALSE;
1497 xfs_fileoff_t first_fsb;
1498 xfs_filblks_t fs_blocks;
1500 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1502 const char *cur_chunk;
1507 struct xfs_dquot *udqp, *gdqp;
1515 trace_xfs_symlink(dp, link_name);
1517 if (XFS_FORCED_SHUTDOWN(mp))
1518 return XFS_ERROR(EIO);
1521 * Check component lengths of the target path name.
1523 pathlen = strlen(target_path);
1524 if (pathlen >= MAXPATHLEN) /* total string too long */
1525 return XFS_ERROR(ENAMETOOLONG);
1528 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1529 prid = xfs_get_projid(dp);
1531 prid = XFS_PROJID_DEFAULT;
1534 * Make sure that we have allocated dquot(s) on disk.
1536 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
1537 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
1541 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
1542 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1544 * The symlink will fit into the inode data fork?
1545 * There can't be any attributes so we get the whole variable part.
1547 if (pathlen <= XFS_LITINO(mp))
1550 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
1551 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
1552 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
1553 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1554 if (error == ENOSPC && fs_blocks == 0) {
1556 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
1557 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
1564 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1565 unlock_dp_on_error = B_TRUE;
1568 * Check whether the directory allows new symlinks or not.
1570 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
1571 error = XFS_ERROR(EPERM);
1576 * Reserve disk quota : blocks and inode.
1578 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
1583 * Check for ability to enter directory entry, if no space reserved.
1585 error = xfs_dir_canenter(tp, dp, link_name, resblks);
1589 * Initialize the bmap freelist prior to calling either
1590 * bmapi or the directory create code.
1592 xfs_bmap_init(&free_list, &first_block);
1595 * Allocate an inode for the symlink.
1597 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
1598 prid, resblks > 0, &ip, NULL);
1600 if (error == ENOSPC)
1606 * An error after we've joined dp to the transaction will result in the
1607 * transaction cancel unlocking dp so don't do it explicitly in the
1610 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1611 unlock_dp_on_error = B_FALSE;
1614 * Also attach the dquot(s) to it, if applicable.
1616 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
1619 resblks -= XFS_IALLOC_SPACE_RES(mp);
1621 * If the symlink will fit into the inode, write it inline.
1623 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
1624 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
1625 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
1626 ip->i_d.di_size = pathlen;
1629 * The inode was initially created in extent format.
1631 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
1632 ip->i_df.if_flags |= XFS_IFINLINE;
1634 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
1635 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
1639 nmaps = SYMLINK_MAPS;
1641 error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
1642 XFS_BMAPI_METADATA, &first_block, resblks,
1643 mval, &nmaps, &free_list);
1648 resblks -= fs_blocks;
1649 ip->i_d.di_size = pathlen;
1650 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1652 cur_chunk = target_path;
1653 for (n = 0; n < nmaps; n++) {
1654 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
1655 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
1656 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
1657 BTOBB(byte_cnt), 0);
1662 if (pathlen < byte_cnt) {
1665 pathlen -= byte_cnt;
1667 memcpy(bp->b_addr, cur_chunk, byte_cnt);
1668 cur_chunk += byte_cnt;
1670 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
1675 * Create the directory entry for the symlink.
1677 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
1678 &first_block, &free_list, resblks);
1681 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1682 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1685 * If this is a synchronous mount, make sure that the
1686 * symlink transaction goes to disk before returning to
1689 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1690 xfs_trans_set_sync(tp);
1693 error = xfs_bmap_finish(&tp, &free_list, &committed);
1697 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1698 xfs_qm_dqrele(udqp);
1699 xfs_qm_dqrele(gdqp);
1707 xfs_bmap_cancel(&free_list);
1708 cancel_flags |= XFS_TRANS_ABORT;
1710 xfs_trans_cancel(tp, cancel_flags);
1711 xfs_qm_dqrele(udqp);
1712 xfs_qm_dqrele(gdqp);
1714 if (unlock_dp_on_error)
1715 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1726 xfs_mount_t *mp = ip->i_mount;
1730 if (!capable(CAP_SYS_ADMIN))
1731 return XFS_ERROR(EPERM);
1733 if (XFS_FORCED_SHUTDOWN(mp))
1734 return XFS_ERROR(EIO);
1736 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
1737 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
1739 xfs_trans_cancel(tp, 0);
1742 xfs_ilock(ip, XFS_ILOCK_EXCL);
1743 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1745 ip->i_d.di_dmevmask = evmask;
1746 ip->i_d.di_dmstate = state;
1748 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1749 error = xfs_trans_commit(tp, 0);
1755 * xfs_alloc_file_space()
1756 * This routine allocates disk space for the given file.
1758 * If alloc_type == 0, this request is for an ALLOCSP type
1759 * request which will change the file size. In this case, no
1760 * DMAPI event will be generated by the call. A TRUNCATE event
1761 * will be generated later by xfs_setattr.
1763 * If alloc_type != 0, this request is for a RESVSP type
1764 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1765 * lower block boundary byte address is less than the file's
1774 xfs_alloc_file_space(
1781 xfs_mount_t *mp = ip->i_mount;
1783 xfs_filblks_t allocated_fsb;
1784 xfs_filblks_t allocatesize_fsb;
1785 xfs_extlen_t extsz, temp;
1786 xfs_fileoff_t startoffset_fsb;
1787 xfs_fsblock_t firstfsb;
1792 xfs_bmbt_irec_t imaps[1], *imapp;
1793 xfs_bmap_free_t free_list;
1794 uint qblocks, resblks, resrtextents;
1798 trace_xfs_alloc_file_space(ip);
1800 if (XFS_FORCED_SHUTDOWN(mp))
1801 return XFS_ERROR(EIO);
1803 error = xfs_qm_dqattach(ip, 0);
1808 return XFS_ERROR(EINVAL);
1810 rt = XFS_IS_REALTIME_INODE(ip);
1811 extsz = xfs_get_extsz_hint(ip);
1816 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
1817 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
1820 * Allocate file space until done or until there is an error
1822 while (allocatesize_fsb && !error) {
1826 * Determine space reservations for data/realtime.
1828 if (unlikely(extsz)) {
1829 s = startoffset_fsb;
1832 e = startoffset_fsb + allocatesize_fsb;
1833 if ((temp = do_mod(startoffset_fsb, extsz)))
1835 if ((temp = do_mod(e, extsz)))
1839 e = allocatesize_fsb;
1843 * The transaction reservation is limited to a 32-bit block
1844 * count, hence we need to limit the number of blocks we are
1845 * trying to reserve to avoid an overflow. We can't allocate
1846 * more than @nimaps extents, and an extent is limited on disk
1847 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1849 resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
1851 resrtextents = qblocks = resblks;
1852 resrtextents /= mp->m_sb.sb_rextsize;
1853 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
1854 quota_flag = XFS_QMOPT_RES_RTBLKS;
1857 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
1858 quota_flag = XFS_QMOPT_RES_REGBLKS;
1862 * Allocate and setup the transaction.
1864 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
1865 error = xfs_trans_reserve(tp, resblks,
1866 XFS_WRITE_LOG_RES(mp), resrtextents,
1867 XFS_TRANS_PERM_LOG_RES,
1868 XFS_WRITE_LOG_COUNT);
1870 * Check for running out of space
1874 * Free the transaction structure.
1876 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
1877 xfs_trans_cancel(tp, 0);
1880 xfs_ilock(ip, XFS_ILOCK_EXCL);
1881 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
1886 xfs_trans_ijoin(tp, ip, 0);
1888 xfs_bmap_init(&free_list, &firstfsb);
1889 error = xfs_bmapi_write(tp, ip, startoffset_fsb,
1890 allocatesize_fsb, alloc_type, &firstfsb,
1891 0, imapp, &nimaps, &free_list);
1897 * Complete the transaction
1899 error = xfs_bmap_finish(&tp, &free_list, &committed);
1904 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1905 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1910 allocated_fsb = imapp->br_blockcount;
1913 error = XFS_ERROR(ENOSPC);
1917 startoffset_fsb += allocated_fsb;
1918 allocatesize_fsb -= allocated_fsb;
1923 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1924 xfs_bmap_cancel(&free_list);
1925 xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
1927 error1: /* Just cancel transaction */
1928 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1929 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1934 * Zero file bytes between startoff and endoff inclusive.
1935 * The iolock is held exclusive and no blocks are buffered.
1937 * This function is used by xfs_free_file_space() to zero
1938 * partial blocks when the range to free is not block aligned.
1939 * When unreserving space with boundaries that are not block
1940 * aligned we round up the start and round down the end
1941 * boundaries and then use this function to zero the parts of
1942 * the blocks that got dropped during the rounding.
1945 xfs_zero_remaining_bytes(
1950 xfs_bmbt_irec_t imap;
1951 xfs_fileoff_t offset_fsb;
1952 xfs_off_t lastoffset;
1955 xfs_mount_t *mp = ip->i_mount;
1960 * Avoid doing I/O beyond eof - it's not necessary
1961 * since nothing can read beyond eof. The space will
1962 * be zeroed when the file is extended anyway.
1964 if (startoff >= ip->i_size)
1967 if (endoff > ip->i_size)
1968 endoff = ip->i_size;
1970 bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
1971 mp->m_rtdev_targp : mp->m_ddev_targp,
1972 mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
1974 return XFS_ERROR(ENOMEM);
1978 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
1979 offset_fsb = XFS_B_TO_FSBT(mp, offset);
1981 error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
1982 if (error || nimap < 1)
1984 ASSERT(imap.br_blockcount >= 1);
1985 ASSERT(imap.br_startoff == offset_fsb);
1986 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
1987 if (lastoffset > endoff)
1988 lastoffset = endoff;
1989 if (imap.br_startblock == HOLESTARTBLOCK)
1991 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1992 if (imap.br_state == XFS_EXT_UNWRITTEN)
1995 XFS_BUF_UNWRITE(bp);
1997 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
1999 error = xfs_buf_iowait(bp);
2001 xfs_buf_ioerror_alert(bp,
2002 "xfs_zero_remaining_bytes(read)");
2006 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
2007 0, lastoffset - offset + 1);
2012 error = xfs_buf_iowait(bp);
2014 xfs_buf_ioerror_alert(bp,
2015 "xfs_zero_remaining_bytes(write)");
2024 * xfs_free_file_space()
2025 * This routine frees disk space for the given file.
2027 * This routine is only called by xfs_change_file_space
2028 * for an UNRESVSP type call.
2036 xfs_free_file_space(
2044 xfs_fileoff_t endoffset_fsb;
2046 xfs_fsblock_t firstfsb;
2047 xfs_bmap_free_t free_list;
2048 xfs_bmbt_irec_t imap;
2056 xfs_fileoff_t startoffset_fsb;
2058 int need_iolock = 1;
2062 trace_xfs_free_file_space(ip);
2064 error = xfs_qm_dqattach(ip, 0);
2069 if (len <= 0) /* if nothing being freed */
2071 rt = XFS_IS_REALTIME_INODE(ip);
2072 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
2073 endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
2075 if (attr_flags & XFS_ATTR_NOLOCK)
2078 xfs_ilock(ip, XFS_IOLOCK_EXCL);
2079 /* wait for the completion of any pending DIOs */
2080 inode_dio_wait(VFS_I(ip));
2083 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
2084 ioffset = offset & ~(rounding - 1);
2086 if (VN_CACHED(VFS_I(ip)) != 0) {
2087 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
2089 goto out_unlock_iolock;
2093 * Need to zero the stuff we're not freeing, on disk.
2094 * If it's a realtime file & can't use unwritten extents then we
2095 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2096 * will take care of it for us.
2098 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
2100 error = xfs_bmapi_read(ip, startoffset_fsb, 1,
2103 goto out_unlock_iolock;
2104 ASSERT(nimap == 0 || nimap == 1);
2105 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2108 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2109 block = imap.br_startblock;
2110 mod = do_div(block, mp->m_sb.sb_rextsize);
2112 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
2115 error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
2118 goto out_unlock_iolock;
2119 ASSERT(nimap == 0 || nimap == 1);
2120 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2121 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2123 if (mod && (mod != mp->m_sb.sb_rextsize))
2124 endoffset_fsb -= mod;
2127 if ((done = (endoffset_fsb <= startoffset_fsb)))
2129 * One contiguous piece to clear
2131 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
2134 * Some full blocks, possibly two pieces to clear
2136 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
2137 error = xfs_zero_remaining_bytes(ip, offset,
2138 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
2140 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
2141 error = xfs_zero_remaining_bytes(ip,
2142 XFS_FSB_TO_B(mp, endoffset_fsb),
2147 * free file space until done or until there is an error
2149 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2150 while (!error && !done) {
2153 * allocate and setup the transaction. Allow this
2154 * transaction to dip into the reserve blocks to ensure
2155 * the freeing of the space succeeds at ENOSPC.
2157 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
2158 tp->t_flags |= XFS_TRANS_RESERVE;
2159 error = xfs_trans_reserve(tp,
2161 XFS_WRITE_LOG_RES(mp),
2163 XFS_TRANS_PERM_LOG_RES,
2164 XFS_WRITE_LOG_COUNT);
2167 * check for running out of space
2171 * Free the transaction structure.
2173 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2174 xfs_trans_cancel(tp, 0);
2177 xfs_ilock(ip, XFS_ILOCK_EXCL);
2178 error = xfs_trans_reserve_quota(tp, mp,
2179 ip->i_udquot, ip->i_gdquot,
2180 resblks, 0, XFS_QMOPT_RES_REGBLKS);
2184 xfs_trans_ijoin(tp, ip, 0);
2187 * issue the bunmapi() call to free the blocks
2189 xfs_bmap_init(&free_list, &firstfsb);
2190 error = xfs_bunmapi(tp, ip, startoffset_fsb,
2191 endoffset_fsb - startoffset_fsb,
2192 0, 2, &firstfsb, &free_list, &done);
2198 * complete the transaction
2200 error = xfs_bmap_finish(&tp, &free_list, &committed);
2205 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2206 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2211 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2215 xfs_bmap_cancel(&free_list);
2217 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2218 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
2224 * xfs_change_file_space()
2225 * This routine allocates or frees disk space for the given file.
2226 * The user specified parameters are checked for alignment and size
2235 xfs_change_file_space(
2242 xfs_mount_t *mp = ip->i_mount;
2247 xfs_off_t startoffset;
2253 if (!S_ISREG(ip->i_d.di_mode))
2254 return XFS_ERROR(EINVAL);
2256 switch (bf->l_whence) {
2257 case 0: /*SEEK_SET*/
2259 case 1: /*SEEK_CUR*/
2260 bf->l_start += offset;
2262 case 2: /*SEEK_END*/
2263 bf->l_start += ip->i_size;
2266 return XFS_ERROR(EINVAL);
2269 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
2271 if ( (bf->l_start < 0)
2272 || (bf->l_start > XFS_MAXIOFFSET(mp))
2273 || (bf->l_start + llen < 0)
2274 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
2275 return XFS_ERROR(EINVAL);
2279 startoffset = bf->l_start;
2283 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2285 * These calls do NOT zero the data space allocated to the file,
2286 * nor do they change the file size.
2288 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2290 * These calls cause the new file data to be zeroed and the file
2291 * size to be changed.
2293 setprealloc = clrprealloc = 0;
2294 prealloc_type = XFS_BMAPI_PREALLOC;
2297 case XFS_IOC_ZERO_RANGE:
2298 prealloc_type |= XFS_BMAPI_CONVERT;
2299 xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
2301 case XFS_IOC_RESVSP:
2302 case XFS_IOC_RESVSP64:
2303 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
2304 prealloc_type, attr_flags);
2310 case XFS_IOC_UNRESVSP:
2311 case XFS_IOC_UNRESVSP64:
2312 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
2317 case XFS_IOC_ALLOCSP:
2318 case XFS_IOC_ALLOCSP64:
2319 case XFS_IOC_FREESP:
2320 case XFS_IOC_FREESP64:
2321 if (startoffset > fsize) {
2322 error = xfs_alloc_file_space(ip, fsize,
2323 startoffset - fsize, 0, attr_flags);
2328 iattr.ia_valid = ATTR_SIZE;
2329 iattr.ia_size = startoffset;
2331 error = xfs_setattr_size(ip, &iattr, attr_flags);
2341 return XFS_ERROR(EINVAL);
2345 * update the inode timestamp, mode, and prealloc flag bits
2347 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
2349 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
2352 xfs_trans_cancel(tp, 0);
2356 xfs_ilock(ip, XFS_ILOCK_EXCL);
2357 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2359 if ((attr_flags & XFS_ATTR_DMI) == 0) {
2360 ip->i_d.di_mode &= ~S_ISUID;
2363 * Note that we don't have to worry about mandatory
2364 * file locking being disabled here because we only
2365 * clear the S_ISGID bit if the Group execute bit is
2366 * on, but if it was on then mandatory locking wouldn't
2367 * have been enabled.
2369 if (ip->i_d.di_mode & S_IXGRP)
2370 ip->i_d.di_mode &= ~S_ISGID;
2372 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2375 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
2376 else if (clrprealloc)
2377 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
2379 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2380 if (attr_flags & XFS_ATTR_SYNC)
2381 xfs_trans_set_sync(tp);
2382 return xfs_trans_commit(tp, 0);