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"
59 xfs_mount_t *mp = ip->i_mount;
60 struct inode *inode = VFS_I(ip);
61 int mask = iattr->ia_valid;
68 struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2;
71 trace_xfs_setattr(ip);
73 if (mp->m_flags & XFS_MOUNT_RDONLY)
74 return XFS_ERROR(EROFS);
76 if (XFS_FORCED_SHUTDOWN(mp))
77 return XFS_ERROR(EIO);
79 code = -inode_change_ok(inode, iattr);
83 olddquot1 = olddquot2 = NULL;
87 * If disk quotas is on, we make sure that the dquots do exist on disk,
88 * before we start any other transactions. Trying to do this later
89 * is messy. We don't care to take a readlock to look at the ids
90 * in inode here, because we can't hold it across the trans_reserve.
91 * If the IDs do change before we take the ilock, we're covered
92 * because the i_*dquot fields will get updated anyway.
94 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
97 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
99 qflags |= XFS_QMOPT_UQUOTA;
101 uid = ip->i_d.di_uid;
103 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
105 qflags |= XFS_QMOPT_GQUOTA;
107 gid = ip->i_d.di_gid;
111 * We take a reference when we initialize udqp and gdqp,
112 * so it is important that we never blindly double trip on
113 * the same variable. See xfs_create() for an example.
115 ASSERT(udqp == NULL);
116 ASSERT(gdqp == NULL);
117 code = xfs_qm_vop_dqalloc(ip, uid, gid, xfs_get_projid(ip),
118 qflags, &udqp, &gdqp);
124 * For the other attributes, we acquire the inode lock and
125 * first do an error checking pass.
128 lock_flags = XFS_ILOCK_EXCL;
129 if (flags & XFS_ATTR_NOLOCK)
131 if (!(mask & ATTR_SIZE)) {
132 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
134 code = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp),
142 lock_flags |= XFS_IOLOCK_EXCL;
145 xfs_ilock(ip, lock_flags);
148 * Change file ownership. Must be the owner or privileged.
150 if (mask & (ATTR_UID|ATTR_GID)) {
152 * These IDs could have changed since we last looked at them.
153 * But, we're assured that if the ownership did change
154 * while we didn't have the inode locked, inode's dquot(s)
155 * would have changed also.
157 iuid = ip->i_d.di_uid;
158 igid = ip->i_d.di_gid;
159 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
160 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
163 * Do a quota reservation only if uid/gid is actually
166 if (XFS_IS_QUOTA_RUNNING(mp) &&
167 ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
168 (XFS_IS_GQUOTA_ON(mp) && igid != gid))) {
170 code = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
171 capable(CAP_FOWNER) ?
172 XFS_QMOPT_FORCE_RES : 0);
173 if (code) /* out of quota */
179 * Truncate file. Must have write permission and not be a directory.
181 if (mask & ATTR_SIZE) {
182 /* Short circuit the truncate case for zero length files */
183 if (iattr->ia_size == 0 &&
184 ip->i_size == 0 && ip->i_d.di_nextents == 0) {
185 xfs_iunlock(ip, XFS_ILOCK_EXCL);
186 lock_flags &= ~XFS_ILOCK_EXCL;
187 if (mask & ATTR_CTIME) {
188 inode->i_mtime = inode->i_ctime =
189 current_fs_time(inode->i_sb);
190 xfs_mark_inode_dirty_sync(ip);
196 if (S_ISDIR(ip->i_d.di_mode)) {
197 code = XFS_ERROR(EISDIR);
199 } else if (!S_ISREG(ip->i_d.di_mode)) {
200 code = XFS_ERROR(EINVAL);
205 * Make sure that the dquots are attached to the inode.
207 code = xfs_qm_dqattach_locked(ip, 0);
212 * Now we can make the changes. Before we join the inode
213 * to the transaction, if ATTR_SIZE is set then take care of
214 * the part of the truncation that must be done without the
215 * inode lock. This needs to be done before joining the inode
216 * to the transaction, because the inode cannot be unlocked
217 * once it is a part of the transaction.
219 if (iattr->ia_size > ip->i_size) {
221 * Do the first part of growing a file: zero any data
222 * in the last block that is beyond the old EOF. We
223 * need to do this before the inode is joined to the
224 * transaction to modify the i_size.
226 code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);
230 xfs_iunlock(ip, XFS_ILOCK_EXCL);
231 lock_flags &= ~XFS_ILOCK_EXCL;
234 * We are going to log the inode size change in this
235 * transaction so any previous writes that are beyond the on
236 * disk EOF and the new EOF that have not been written out need
237 * to be written here. If we do not write the data out, we
238 * expose ourselves to the null files problem.
240 * Only flush from the on disk size to the smaller of the in
241 * memory file size or the new size as that's the range we
242 * really care about here and prevents waiting for other data
243 * not within the range we care about here.
245 if (ip->i_size != ip->i_d.di_size &&
246 iattr->ia_size > ip->i_d.di_size) {
247 code = xfs_flush_pages(ip,
248 ip->i_d.di_size, iattr->ia_size,
254 /* wait for all I/O to complete */
257 code = -block_truncate_page(inode->i_mapping, iattr->ia_size,
262 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
263 code = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
264 XFS_TRANS_PERM_LOG_RES,
265 XFS_ITRUNCATE_LOG_COUNT);
269 truncate_setsize(inode, iattr->ia_size);
271 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
272 lock_flags |= XFS_ILOCK_EXCL;
274 xfs_ilock(ip, XFS_ILOCK_EXCL);
276 xfs_trans_ijoin(tp, ip);
279 * Only change the c/mtime if we are changing the size
280 * or we are explicitly asked to change it. This handles
281 * the semantic difference between truncate() and ftruncate()
282 * as implemented in the VFS.
284 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME
285 * is a special case where we need to update the times despite
286 * not having these flags set. For all other operations the
287 * VFS set these flags explicitly if it wants a timestamp
290 if (iattr->ia_size != ip->i_size &&
291 (!(mask & (ATTR_CTIME | ATTR_MTIME)))) {
292 iattr->ia_ctime = iattr->ia_mtime =
293 current_fs_time(inode->i_sb);
294 mask |= ATTR_CTIME | ATTR_MTIME;
297 if (iattr->ia_size > ip->i_size) {
298 ip->i_d.di_size = iattr->ia_size;
299 ip->i_size = iattr->ia_size;
300 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
301 } else if (iattr->ia_size <= ip->i_size ||
302 (iattr->ia_size == 0 && ip->i_d.di_nextents)) {
304 * signal a sync transaction unless
305 * we're truncating an already unlinked
306 * file on a wsync filesystem
308 code = xfs_itruncate_finish(&tp, ip, iattr->ia_size,
310 ((ip->i_d.di_nlink != 0 ||
311 !(mp->m_flags & XFS_MOUNT_WSYNC))
316 * Truncated "down", so we're removing references
317 * to old data here - if we now delay flushing for
318 * a long time, we expose ourselves unduly to the
319 * notorious NULL files problem. So, we mark this
320 * vnode and flush it when the file is closed, and
321 * do not wait the usual (long) time for writeout.
323 xfs_iflags_set(ip, XFS_ITRUNCATED);
326 xfs_trans_ijoin(tp, ip);
330 * Change file ownership. Must be the owner or privileged.
332 if (mask & (ATTR_UID|ATTR_GID)) {
334 * CAP_FSETID overrides the following restrictions:
336 * The set-user-ID and set-group-ID bits of a file will be
337 * cleared upon successful return from chown()
339 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
340 !capable(CAP_FSETID)) {
341 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
345 * Change the ownerships and register quota modifications
346 * in the transaction.
349 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
350 ASSERT(mask & ATTR_UID);
352 olddquot1 = xfs_qm_vop_chown(tp, ip,
353 &ip->i_udquot, udqp);
355 ip->i_d.di_uid = uid;
359 if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
360 ASSERT(!XFS_IS_PQUOTA_ON(mp));
361 ASSERT(mask & ATTR_GID);
363 olddquot2 = xfs_qm_vop_chown(tp, ip,
364 &ip->i_gdquot, gdqp);
366 ip->i_d.di_gid = gid;
372 * Change file access modes.
374 if (mask & ATTR_MODE) {
375 umode_t mode = iattr->ia_mode;
377 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
380 ip->i_d.di_mode &= S_IFMT;
381 ip->i_d.di_mode |= mode & ~S_IFMT;
383 inode->i_mode &= S_IFMT;
384 inode->i_mode |= mode & ~S_IFMT;
388 * Change file access or modified times.
390 if (mask & ATTR_ATIME) {
391 inode->i_atime = iattr->ia_atime;
392 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
393 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
394 ip->i_update_core = 1;
396 if (mask & ATTR_CTIME) {
397 inode->i_ctime = iattr->ia_ctime;
398 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
399 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
400 ip->i_update_core = 1;
402 if (mask & ATTR_MTIME) {
403 inode->i_mtime = iattr->ia_mtime;
404 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
405 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
406 ip->i_update_core = 1;
410 * And finally, log the inode core if any attribute in it
413 if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE|
414 ATTR_ATIME|ATTR_CTIME|ATTR_MTIME))
415 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
417 XFS_STATS_INC(xs_ig_attrchg);
420 * If this is a synchronous mount, make sure that the
421 * transaction goes to disk before returning to the user.
422 * This is slightly sub-optimal in that truncates require
423 * two sync transactions instead of one for wsync filesystems.
424 * One for the truncate and one for the timestamps since we
425 * don't want to change the timestamps unless we're sure the
426 * truncate worked. Truncates are less than 1% of the laddis
427 * mix so this probably isn't worth the trouble to optimize.
430 if (mp->m_flags & XFS_MOUNT_WSYNC)
431 xfs_trans_set_sync(tp);
433 code = xfs_trans_commit(tp, commit_flags);
435 xfs_iunlock(ip, lock_flags);
438 * Release any dquot(s) the inode had kept before chown.
440 xfs_qm_dqrele(olddquot1);
441 xfs_qm_dqrele(olddquot2);
449 * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
450 * update. We could avoid this with linked transactions
451 * and passing down the transaction pointer all the way
452 * to attr_set. No previous user of the generic
453 * Posix ACL code seems to care about this issue either.
455 if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
456 code = -xfs_acl_chmod(inode);
458 return XFS_ERROR(code);
464 commit_flags |= XFS_TRANS_ABORT;
469 xfs_trans_cancel(tp, commit_flags);
471 if (lock_flags != 0) {
472 xfs_iunlock(ip, lock_flags);
478 * The maximum pathlen is 1024 bytes. Since the minimum file system
479 * blocksize is 512 bytes, we can get a max of 2 extents back from
482 #define SYMLINK_MAPS 2
489 xfs_mount_t *mp = ip->i_mount;
490 int pathlen = ip->i_d.di_size;
491 int nmaps = SYMLINK_MAPS;
492 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
499 error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0,
504 for (n = 0; n < nmaps; n++) {
505 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
506 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
508 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
509 XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK);
510 error = XFS_BUF_GETERROR(bp);
512 xfs_ioerror_alert("xfs_readlink",
513 ip->i_mount, bp, XFS_BUF_ADDR(bp));
517 if (pathlen < byte_cnt)
521 memcpy(link, XFS_BUF_PTR(bp), byte_cnt);
525 link[ip->i_d.di_size] = '\0';
537 xfs_mount_t *mp = ip->i_mount;
541 trace_xfs_readlink(ip);
543 if (XFS_FORCED_SHUTDOWN(mp))
544 return XFS_ERROR(EIO);
546 xfs_ilock(ip, XFS_ILOCK_SHARED);
548 ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
549 ASSERT(ip->i_d.di_size <= MAXPATHLEN);
551 pathlen = ip->i_d.di_size;
555 if (ip->i_df.if_flags & XFS_IFINLINE) {
556 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
557 link[pathlen] = '\0';
559 error = xfs_readlink_bmap(ip, link);
563 xfs_iunlock(ip, XFS_ILOCK_SHARED);
568 * Flags for xfs_free_eofblocks
570 #define XFS_FREE_EOF_TRYLOCK (1<<0)
573 * This is called by xfs_inactive to free any blocks beyond eof
574 * when the link count isn't zero and by xfs_dm_punch_hole() when
575 * punching a hole to EOF.
585 xfs_fileoff_t end_fsb;
586 xfs_fileoff_t last_fsb;
587 xfs_filblks_t map_len;
589 xfs_bmbt_irec_t imap;
592 * Figure out if there are any blocks beyond the end
593 * of the file. If not, then there is nothing to do.
595 end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
596 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
597 if (last_fsb <= end_fsb)
599 map_len = last_fsb - end_fsb;
602 xfs_ilock(ip, XFS_ILOCK_SHARED);
603 error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0,
604 NULL, 0, &imap, &nimaps, NULL);
605 xfs_iunlock(ip, XFS_ILOCK_SHARED);
607 if (!error && (nimaps != 0) &&
608 (imap.br_startblock != HOLESTARTBLOCK ||
609 ip->i_delayed_blks)) {
611 * Attach the dquots to the inode up front.
613 error = xfs_qm_dqattach(ip, 0);
618 * There are blocks after the end of file.
619 * Free them up now by truncating the file to
622 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
625 * Do the xfs_itruncate_start() call before
626 * reserving any log space because
627 * itruncate_start will call into the buffer
629 * do that within a transaction.
631 if (flags & XFS_FREE_EOF_TRYLOCK) {
632 if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
633 xfs_trans_cancel(tp, 0);
637 xfs_ilock(ip, XFS_IOLOCK_EXCL);
639 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
642 xfs_trans_cancel(tp, 0);
643 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
647 error = xfs_trans_reserve(tp, 0,
648 XFS_ITRUNCATE_LOG_RES(mp),
649 0, XFS_TRANS_PERM_LOG_RES,
650 XFS_ITRUNCATE_LOG_COUNT);
652 ASSERT(XFS_FORCED_SHUTDOWN(mp));
653 xfs_trans_cancel(tp, 0);
654 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
658 xfs_ilock(ip, XFS_ILOCK_EXCL);
659 xfs_trans_ijoin(tp, ip);
661 error = xfs_itruncate_finish(&tp, ip,
666 * If we get an error at this point we
667 * simply don't bother truncating the file.
671 (XFS_TRANS_RELEASE_LOG_RES |
674 error = xfs_trans_commit(tp,
675 XFS_TRANS_RELEASE_LOG_RES);
677 xfs_iunlock(ip, XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL);
683 * Free a symlink that has blocks associated with it.
686 xfs_inactive_symlink_rmt(
694 xfs_fsblock_t first_block;
695 xfs_bmap_free_t free_list;
698 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
706 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
708 * We're freeing a symlink that has some
709 * blocks allocated to it. Free the
710 * blocks here. We know that we've got
711 * either 1 or 2 extents and that we can
712 * free them all in one bunmapi call.
714 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
715 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
716 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
717 ASSERT(XFS_FORCED_SHUTDOWN(mp));
718 xfs_trans_cancel(tp, 0);
723 * Lock the inode, fix the size, and join it to the transaction.
724 * Hold it so in the normal path, we still have it locked for
725 * the second transaction. In the error paths we need it
726 * held so the cancel won't rele it, see below.
728 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
729 size = (int)ip->i_d.di_size;
731 xfs_trans_ijoin(tp, ip);
732 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
734 * Find the block(s) so we can inval and unmap them.
737 xfs_bmap_init(&free_list, &first_block);
738 nmaps = ARRAY_SIZE(mval);
739 if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
740 XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
744 * Invalidate the block(s).
746 for (i = 0; i < nmaps; i++) {
747 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
748 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
749 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
750 xfs_trans_binval(tp, bp);
753 * Unmap the dead block(s) to the free_list.
755 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
756 &first_block, &free_list, &done)))
760 * Commit the first transaction. This logs the EFI and the inode.
762 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
765 * The transaction must have been committed, since there were
766 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
767 * The new tp has the extent freeing and EFDs.
771 * The first xact was committed, so add the inode to the new one.
772 * Mark it dirty so it will be logged and moved forward in the log as
773 * part of every commit.
775 xfs_trans_ijoin(tp, ip);
776 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
778 * Get a new, empty transaction to return to our caller.
780 ntp = xfs_trans_dup(tp);
782 * Commit the transaction containing extent freeing and EFDs.
783 * If we get an error on the commit here or on the reserve below,
784 * we need to unlock the inode since the new transaction doesn't
785 * have the inode attached.
787 error = xfs_trans_commit(tp, 0);
790 ASSERT(XFS_FORCED_SHUTDOWN(mp));
794 * transaction commit worked ok so we can drop the extra ticket
795 * reference that we gained in xfs_trans_dup()
797 xfs_log_ticket_put(tp->t_ticket);
800 * Remove the memory for extent descriptions (just bookkeeping).
802 if (ip->i_df.if_bytes)
803 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
804 ASSERT(ip->i_df.if_bytes == 0);
806 * Put an itruncate log reservation in the new transaction
809 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
810 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
811 ASSERT(XFS_FORCED_SHUTDOWN(mp));
815 * Return with the inode locked but not joined to the transaction.
821 xfs_bmap_cancel(&free_list);
824 * Have to come here with the inode locked and either
825 * (held and in the transaction) or (not in the transaction).
826 * If the inode isn't held then cancel would iput it, but
827 * that's wrong since this is inactive and the vnode ref
828 * count is 0 already.
829 * Cancel won't do anything to the inode if held, but it still
830 * needs to be locked until the cancel is done, if it was
831 * joined to the transaction.
833 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
834 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
841 xfs_inactive_symlink_local(
847 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
849 * We're freeing a symlink which fit into
850 * the inode. Just free the memory used
851 * to hold the old symlink.
853 error = xfs_trans_reserve(*tpp, 0,
854 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
855 0, XFS_TRANS_PERM_LOG_RES,
856 XFS_ITRUNCATE_LOG_COUNT);
859 xfs_trans_cancel(*tpp, 0);
863 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
866 * Zero length symlinks _can_ exist.
868 if (ip->i_df.if_bytes > 0) {
869 xfs_idata_realloc(ip,
870 -(ip->i_df.if_bytes),
872 ASSERT(ip->i_df.if_bytes == 0);
886 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
889 ASSERT(ip->i_d.di_forkoff != 0);
890 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
891 xfs_iunlock(ip, XFS_ILOCK_EXCL);
895 error = xfs_attr_inactive(ip);
899 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
900 error = xfs_trans_reserve(tp, 0,
901 XFS_IFREE_LOG_RES(mp),
902 0, XFS_TRANS_PERM_LOG_RES,
903 XFS_INACTIVE_LOG_COUNT);
907 xfs_ilock(ip, XFS_ILOCK_EXCL);
908 xfs_trans_ijoin(tp, ip);
909 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
911 ASSERT(ip->i_d.di_anextents == 0);
917 ASSERT(XFS_FORCED_SHUTDOWN(mp));
918 xfs_trans_cancel(tp, 0);
921 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
929 xfs_mount_t *mp = ip->i_mount;
932 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
935 /* If this is a read-only mount, don't do this (would generate I/O) */
936 if (mp->m_flags & XFS_MOUNT_RDONLY)
939 if (!XFS_FORCED_SHUTDOWN(mp)) {
943 * If we are using filestreams, and we have an unlinked
944 * file that we are processing the last close on, then nothing
945 * will be able to reopen and write to this file. Purge this
946 * inode from the filestreams cache so that it doesn't delay
947 * teardown of the inode.
949 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
950 xfs_filestream_deassociate(ip);
953 * If we previously truncated this file and removed old data
954 * in the process, we want to initiate "early" writeout on
955 * the last close. This is an attempt to combat the notorious
956 * NULL files problem which is particularly noticeable from a
957 * truncate down, buffered (re-)write (delalloc), followed by
958 * a crash. What we are effectively doing here is
959 * significantly reducing the time window where we'd otherwise
960 * be exposed to that problem.
962 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
963 if (truncated && VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
964 xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
967 if (ip->i_d.di_nlink == 0)
970 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
971 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
972 ip->i_delayed_blks > 0)) &&
973 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
974 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
977 * If we can't get the iolock just skip truncating the blocks
978 * past EOF because we could deadlock with the mmap_sem
979 * otherwise. We'll get another chance to drop them once the
980 * last reference to the inode is dropped, so we'll never leak
981 * blocks permanently.
983 * Further, check if the inode is being opened, written and
984 * closed frequently and we have delayed allocation blocks
985 * outstanding (e.g. streaming writes from the NFS server),
986 * truncating the blocks past EOF will cause fragmentation to
989 * In this case don't do the truncation, either, but we have to
990 * be careful how we detect this case. Blocks beyond EOF show
991 * up as i_delayed_blks even when the inode is clean, so we
992 * need to truncate them away first before checking for a dirty
993 * release. Hence on the first dirty close we will still remove
994 * the speculative allocation, but after that we will leave it
997 if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE))
1000 error = xfs_free_eofblocks(mp, ip,
1001 XFS_FREE_EOF_TRYLOCK);
1005 /* delalloc blocks after truncation means it really is dirty */
1006 if (ip->i_delayed_blks)
1007 xfs_iflags_set(ip, XFS_IDIRTY_RELEASE);
1015 * This is called when the vnode reference count for the vnode
1016 * goes to zero. If the file has been unlinked, then it must
1017 * now be truncated. Also, we clear all of the read-ahead state
1018 * kept for the inode here since the file is now closed.
1024 xfs_bmap_free_t free_list;
1025 xfs_fsblock_t first_block;
1033 * If the inode is already free, then there can be nothing
1036 if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) {
1037 ASSERT(ip->i_df.if_real_bytes == 0);
1038 ASSERT(ip->i_df.if_broot_bytes == 0);
1039 return VN_INACTIVE_CACHE;
1043 * Only do a truncate if it's a regular file with
1044 * some actual space in it. It's OK to look at the
1045 * inode's fields without the lock because we're the
1046 * only one with a reference to the inode.
1048 truncate = ((ip->i_d.di_nlink == 0) &&
1049 ((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
1050 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
1051 ((ip->i_d.di_mode & S_IFMT) == S_IFREG));
1057 /* If this is a read-only mount, don't do this (would generate I/O) */
1058 if (mp->m_flags & XFS_MOUNT_RDONLY)
1061 if (ip->i_d.di_nlink != 0) {
1062 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1063 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
1064 ip->i_delayed_blks > 0)) &&
1065 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
1066 (!(ip->i_d.di_flags &
1067 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
1068 (ip->i_delayed_blks != 0)))) {
1069 error = xfs_free_eofblocks(mp, ip, 0);
1071 return VN_INACTIVE_CACHE;
1076 ASSERT(ip->i_d.di_nlink == 0);
1078 error = xfs_qm_dqattach(ip, 0);
1080 return VN_INACTIVE_CACHE;
1082 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1085 * Do the xfs_itruncate_start() call before
1086 * reserving any log space because itruncate_start
1087 * will call into the buffer cache and we can't
1088 * do that within a transaction.
1090 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1092 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
1094 xfs_trans_cancel(tp, 0);
1095 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1096 return VN_INACTIVE_CACHE;
1099 error = xfs_trans_reserve(tp, 0,
1100 XFS_ITRUNCATE_LOG_RES(mp),
1101 0, XFS_TRANS_PERM_LOG_RES,
1102 XFS_ITRUNCATE_LOG_COUNT);
1104 /* Don't call itruncate_cleanup */
1105 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1106 xfs_trans_cancel(tp, 0);
1107 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1108 return VN_INACTIVE_CACHE;
1111 xfs_ilock(ip, XFS_ILOCK_EXCL);
1112 xfs_trans_ijoin(tp, ip);
1115 * normally, we have to run xfs_itruncate_finish sync.
1116 * But if filesystem is wsync and we're in the inactive
1117 * path, then we know that nlink == 0, and that the
1118 * xaction that made nlink == 0 is permanently committed
1119 * since xfs_remove runs as a synchronous transaction.
1121 error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK,
1122 (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0));
1125 xfs_trans_cancel(tp,
1126 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1127 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1128 return VN_INACTIVE_CACHE;
1130 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) {
1133 * If we get an error while cleaning up a
1134 * symlink we bail out.
1136 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
1137 xfs_inactive_symlink_rmt(ip, &tp) :
1138 xfs_inactive_symlink_local(ip, &tp);
1142 return VN_INACTIVE_CACHE;
1145 xfs_trans_ijoin(tp, ip);
1147 error = xfs_trans_reserve(tp, 0,
1148 XFS_IFREE_LOG_RES(mp),
1149 0, XFS_TRANS_PERM_LOG_RES,
1150 XFS_INACTIVE_LOG_COUNT);
1152 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1153 xfs_trans_cancel(tp, 0);
1154 return VN_INACTIVE_CACHE;
1157 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1158 xfs_trans_ijoin(tp, ip);
1162 * If there are attributes associated with the file
1163 * then blow them away now. The code calls a routine
1164 * that recursively deconstructs the attribute fork.
1165 * We need to just commit the current transaction
1166 * because we can't use it for xfs_attr_inactive().
1168 if (ip->i_d.di_anextents > 0) {
1169 error = xfs_inactive_attrs(ip, &tp);
1171 * If we got an error, the transaction is already
1172 * cancelled, and the inode is unlocked. Just get out.
1175 return VN_INACTIVE_CACHE;
1176 } else if (ip->i_afp) {
1177 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1183 xfs_bmap_init(&free_list, &first_block);
1184 error = xfs_ifree(tp, ip, &free_list);
1187 * If we fail to free the inode, shut down. The cancel
1188 * might do that, we need to make sure. Otherwise the
1189 * inode might be lost for a long time or forever.
1191 if (!XFS_FORCED_SHUTDOWN(mp)) {
1192 xfs_notice(mp, "%s: xfs_ifree returned error %d",
1194 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1196 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
1199 * Credit the quota account(s). The inode is gone.
1201 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1204 * Just ignore errors at this point. There is nothing we can
1205 * do except to try to keep going. Make sure it's not a silent
1208 error = xfs_bmap_finish(&tp, &free_list, &committed);
1210 xfs_notice(mp, "%s: xfs_bmap_finish returned error %d",
1212 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1214 xfs_notice(mp, "%s: xfs_trans_commit returned error %d",
1219 * Release the dquots held by inode, if any.
1221 xfs_qm_dqdetach(ip);
1222 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1225 return VN_INACTIVE_CACHE;
1229 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
1230 * is allowed, otherwise it has to be an exact match. If a CI match is found,
1231 * ci_name->name will point to a the actual name (caller must free) or
1232 * will be set to NULL if an exact match is found.
1237 struct xfs_name *name,
1239 struct xfs_name *ci_name)
1245 trace_xfs_lookup(dp, name);
1247 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
1248 return XFS_ERROR(EIO);
1250 lock_mode = xfs_ilock_map_shared(dp);
1251 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
1252 xfs_iunlock_map_shared(dp, lock_mode);
1257 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
1265 kmem_free(ci_name->name);
1274 struct xfs_name *name,
1279 int is_dir = S_ISDIR(mode);
1280 struct xfs_mount *mp = dp->i_mount;
1281 struct xfs_inode *ip = NULL;
1282 struct xfs_trans *tp = NULL;
1284 xfs_bmap_free_t free_list;
1285 xfs_fsblock_t first_block;
1286 boolean_t unlock_dp_on_error = B_FALSE;
1290 struct xfs_dquot *udqp = NULL;
1291 struct xfs_dquot *gdqp = NULL;
1296 trace_xfs_create(dp, name);
1298 if (XFS_FORCED_SHUTDOWN(mp))
1299 return XFS_ERROR(EIO);
1301 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1302 prid = xfs_get_projid(dp);
1304 prid = XFS_PROJID_DEFAULT;
1307 * Make sure that we have allocated dquot(s) on disk.
1309 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
1310 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
1316 resblks = XFS_MKDIR_SPACE_RES(mp, name->len);
1317 log_res = XFS_MKDIR_LOG_RES(mp);
1318 log_count = XFS_MKDIR_LOG_COUNT;
1319 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
1321 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
1322 log_res = XFS_CREATE_LOG_RES(mp);
1323 log_count = XFS_CREATE_LOG_COUNT;
1324 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
1327 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1330 * Initially assume that the file does not exist and
1331 * reserve the resources for that case. If that is not
1332 * the case we'll drop the one we have and get a more
1333 * appropriate transaction later.
1335 error = xfs_trans_reserve(tp, resblks, log_res, 0,
1336 XFS_TRANS_PERM_LOG_RES, log_count);
1337 if (error == ENOSPC) {
1338 /* flush outstanding delalloc blocks and retry */
1339 xfs_flush_inodes(dp);
1340 error = xfs_trans_reserve(tp, resblks, log_res, 0,
1341 XFS_TRANS_PERM_LOG_RES, log_count);
1343 if (error == ENOSPC) {
1344 /* No space at all so try a "no-allocation" reservation */
1346 error = xfs_trans_reserve(tp, 0, log_res, 0,
1347 XFS_TRANS_PERM_LOG_RES, log_count);
1351 goto out_trans_cancel;
1354 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1355 unlock_dp_on_error = B_TRUE;
1358 * Check for directory link count overflow.
1360 if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) {
1361 error = XFS_ERROR(EMLINK);
1362 goto out_trans_cancel;
1365 xfs_bmap_init(&free_list, &first_block);
1368 * Reserve disk quota and the inode.
1370 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
1372 goto out_trans_cancel;
1374 error = xfs_dir_canenter(tp, dp, name, resblks);
1376 goto out_trans_cancel;
1379 * A newly created regular or special file just has one directory
1380 * entry pointing to them, but a directory also the "." entry
1381 * pointing to itself.
1383 error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev,
1384 prid, resblks > 0, &ip, &committed);
1386 if (error == ENOSPC)
1387 goto out_trans_cancel;
1388 goto out_trans_abort;
1392 * Now we join the directory inode to the transaction. We do not do it
1393 * earlier because xfs_dir_ialloc might commit the previous transaction
1394 * (and release all the locks). An error from here on will result in
1395 * the transaction cancel unlocking dp so don't do it explicitly in the
1398 xfs_trans_ijoin_ref(tp, dp, XFS_ILOCK_EXCL);
1399 unlock_dp_on_error = B_FALSE;
1401 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
1402 &first_block, &free_list, resblks ?
1403 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
1405 ASSERT(error != ENOSPC);
1406 goto out_trans_abort;
1408 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1409 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1412 error = xfs_dir_init(tp, ip, dp);
1414 goto out_bmap_cancel;
1416 error = xfs_bumplink(tp, dp);
1418 goto out_bmap_cancel;
1422 * If this is a synchronous mount, make sure that the
1423 * create transaction goes to disk before returning to
1426 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1427 xfs_trans_set_sync(tp);
1430 * Attach the dquot(s) to the inodes and modify them incore.
1431 * These ids of the inode couldn't have changed since the new
1432 * inode has been locked ever since it was created.
1434 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
1436 error = xfs_bmap_finish(&tp, &free_list, &committed);
1438 goto out_bmap_cancel;
1440 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1442 goto out_release_inode;
1444 xfs_qm_dqrele(udqp);
1445 xfs_qm_dqrele(gdqp);
1451 xfs_bmap_cancel(&free_list);
1453 cancel_flags |= XFS_TRANS_ABORT;
1455 xfs_trans_cancel(tp, cancel_flags);
1458 * Wait until after the current transaction is aborted to
1459 * release the inode. This prevents recursive transactions
1460 * and deadlocks from xfs_inactive.
1465 xfs_qm_dqrele(udqp);
1466 xfs_qm_dqrele(gdqp);
1468 if (unlock_dp_on_error)
1469 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1475 int xfs_small_retries;
1476 int xfs_middle_retries;
1477 int xfs_lots_retries;
1478 int xfs_lock_delays;
1482 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1486 xfs_lock_inumorder(int lock_mode, int subclass)
1488 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1489 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
1490 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
1491 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
1497 * The following routine will lock n inodes in exclusive mode.
1498 * We assume the caller calls us with the inodes in i_ino order.
1500 * We need to detect deadlock where an inode that we lock
1501 * is in the AIL and we start waiting for another inode that is locked
1502 * by a thread in a long running transaction (such as truncate). This can
1503 * result in deadlock since the long running trans might need to wait
1504 * for the inode we just locked in order to push the tail and free space
1513 int attempts = 0, i, j, try_lock;
1516 ASSERT(ips && (inodes >= 2)); /* we need at least two */
1522 for (; i < inodes; i++) {
1525 if (i && (ips[i] == ips[i-1])) /* Already locked */
1529 * If try_lock is not set yet, make sure all locked inodes
1530 * are not in the AIL.
1531 * If any are, set try_lock to be used later.
1535 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1536 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1537 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1544 * If any of the previous locks we have locked is in the AIL,
1545 * we must TRY to get the second and subsequent locks. If
1546 * we can't get any, we must release all we have
1551 /* try_lock must be 0 if i is 0. */
1553 * try_lock means we have an inode locked
1554 * that is in the AIL.
1557 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
1561 * Unlock all previous guys and try again.
1562 * xfs_iunlock will try to push the tail
1563 * if the inode is in the AIL.
1566 for(j = i - 1; j >= 0; j--) {
1569 * Check to see if we've already
1570 * unlocked this one.
1571 * Not the first one going back,
1572 * and the inode ptr is the same.
1574 if ((j != (i - 1)) && ips[j] ==
1578 xfs_iunlock(ips[j], lock_mode);
1581 if ((attempts % 5) == 0) {
1582 delay(1); /* Don't just spin the CPU */
1592 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
1598 if (attempts < 5) xfs_small_retries++;
1599 else if (attempts < 100) xfs_middle_retries++;
1600 else xfs_lots_retries++;
1608 * xfs_lock_two_inodes() can only be used to lock one type of lock
1609 * at a time - the iolock or the ilock, but not both at once. If
1610 * we lock both at once, lockdep will report false positives saying
1611 * we have violated locking orders.
1614 xfs_lock_two_inodes(
1623 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1624 ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
1625 ASSERT(ip0->i_ino != ip1->i_ino);
1627 if (ip0->i_ino > ip1->i_ino) {
1634 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1637 * If the first lock we have locked is in the AIL, we must TRY to get
1638 * the second lock. If we can't get it, we must release the first one
1641 lp = (xfs_log_item_t *)ip0->i_itemp;
1642 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1643 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1644 xfs_iunlock(ip0, lock_mode);
1645 if ((++attempts % 5) == 0)
1646 delay(1); /* Don't just spin the CPU */
1650 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1657 struct xfs_name *name,
1660 xfs_mount_t *mp = dp->i_mount;
1661 xfs_trans_t *tp = NULL;
1662 int is_dir = S_ISDIR(ip->i_d.di_mode);
1664 xfs_bmap_free_t free_list;
1665 xfs_fsblock_t first_block;
1672 trace_xfs_remove(dp, name);
1674 if (XFS_FORCED_SHUTDOWN(mp))
1675 return XFS_ERROR(EIO);
1677 error = xfs_qm_dqattach(dp, 0);
1681 error = xfs_qm_dqattach(ip, 0);
1686 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1687 log_count = XFS_DEFAULT_LOG_COUNT;
1689 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1690 log_count = XFS_REMOVE_LOG_COUNT;
1692 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1695 * We try to get the real space reservation first,
1696 * allowing for directory btree deletion(s) implying
1697 * possible bmap insert(s). If we can't get the space
1698 * reservation then we use 0 instead, and avoid the bmap
1699 * btree insert(s) in the directory code by, if the bmap
1700 * insert tries to happen, instead trimming the LAST
1701 * block from the directory.
1703 resblks = XFS_REMOVE_SPACE_RES(mp);
1704 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
1705 XFS_TRANS_PERM_LOG_RES, log_count);
1706 if (error == ENOSPC) {
1708 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
1709 XFS_TRANS_PERM_LOG_RES, log_count);
1712 ASSERT(error != ENOSPC);
1714 goto out_trans_cancel;
1717 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
1719 xfs_trans_ijoin_ref(tp, dp, XFS_ILOCK_EXCL);
1720 xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
1723 * If we're removing a directory perform some additional validation.
1726 ASSERT(ip->i_d.di_nlink >= 2);
1727 if (ip->i_d.di_nlink != 2) {
1728 error = XFS_ERROR(ENOTEMPTY);
1729 goto out_trans_cancel;
1731 if (!xfs_dir_isempty(ip)) {
1732 error = XFS_ERROR(ENOTEMPTY);
1733 goto out_trans_cancel;
1737 xfs_bmap_init(&free_list, &first_block);
1738 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
1739 &first_block, &free_list, resblks);
1741 ASSERT(error != ENOENT);
1742 goto out_bmap_cancel;
1744 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1748 * Drop the link from ip's "..".
1750 error = xfs_droplink(tp, dp);
1752 goto out_bmap_cancel;
1755 * Drop the "." link from ip to self.
1757 error = xfs_droplink(tp, ip);
1759 goto out_bmap_cancel;
1762 * When removing a non-directory we need to log the parent
1763 * inode here. For a directory this is done implicitly
1764 * by the xfs_droplink call for the ".." entry.
1766 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1770 * Drop the link from dp to ip.
1772 error = xfs_droplink(tp, ip);
1774 goto out_bmap_cancel;
1777 * Determine if this is the last link while
1778 * we are in the transaction.
1780 link_zero = (ip->i_d.di_nlink == 0);
1783 * If this is a synchronous mount, make sure that the
1784 * remove transaction goes to disk before returning to
1787 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1788 xfs_trans_set_sync(tp);
1790 error = xfs_bmap_finish(&tp, &free_list, &committed);
1792 goto out_bmap_cancel;
1794 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1799 * If we are using filestreams, kill the stream association.
1800 * If the file is still open it may get a new one but that
1801 * will get killed on last close in xfs_close() so we don't
1802 * have to worry about that.
1804 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
1805 xfs_filestream_deassociate(ip);
1810 xfs_bmap_cancel(&free_list);
1811 cancel_flags |= XFS_TRANS_ABORT;
1813 xfs_trans_cancel(tp, cancel_flags);
1822 struct xfs_name *target_name)
1824 xfs_mount_t *mp = tdp->i_mount;
1827 xfs_bmap_free_t free_list;
1828 xfs_fsblock_t first_block;
1833 trace_xfs_link(tdp, target_name);
1835 ASSERT(!S_ISDIR(sip->i_d.di_mode));
1837 if (XFS_FORCED_SHUTDOWN(mp))
1838 return XFS_ERROR(EIO);
1840 error = xfs_qm_dqattach(sip, 0);
1844 error = xfs_qm_dqattach(tdp, 0);
1848 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
1849 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1850 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
1851 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
1852 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1853 if (error == ENOSPC) {
1855 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
1856 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
1863 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
1865 xfs_trans_ijoin_ref(tp, sip, XFS_ILOCK_EXCL);
1866 xfs_trans_ijoin_ref(tp, tdp, XFS_ILOCK_EXCL);
1869 * If the source has too many links, we can't make any more to it.
1871 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
1872 error = XFS_ERROR(EMLINK);
1877 * If we are using project inheritance, we only allow hard link
1878 * creation in our tree when the project IDs are the same; else
1879 * the tree quota mechanism could be circumvented.
1881 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
1882 (xfs_get_projid(tdp) != xfs_get_projid(sip)))) {
1883 error = XFS_ERROR(EXDEV);
1887 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
1891 xfs_bmap_init(&free_list, &first_block);
1893 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
1894 &first_block, &free_list, resblks);
1897 xfs_trans_ichgtime(tp, tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1898 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
1900 error = xfs_bumplink(tp, sip);
1905 * If this is a synchronous mount, make sure that the
1906 * link transaction goes to disk before returning to
1909 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1910 xfs_trans_set_sync(tp);
1913 error = xfs_bmap_finish (&tp, &free_list, &committed);
1915 xfs_bmap_cancel(&free_list);
1919 return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1922 cancel_flags |= XFS_TRANS_ABORT;
1924 xfs_trans_cancel(tp, cancel_flags);
1932 struct xfs_name *link_name,
1933 const char *target_path,
1937 xfs_mount_t *mp = dp->i_mount;
1942 xfs_bmap_free_t free_list;
1943 xfs_fsblock_t first_block;
1944 boolean_t unlock_dp_on_error = B_FALSE;
1947 xfs_fileoff_t first_fsb;
1948 xfs_filblks_t fs_blocks;
1950 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1952 const char *cur_chunk;
1957 struct xfs_dquot *udqp, *gdqp;
1965 trace_xfs_symlink(dp, link_name);
1967 if (XFS_FORCED_SHUTDOWN(mp))
1968 return XFS_ERROR(EIO);
1971 * Check component lengths of the target path name.
1973 pathlen = strlen(target_path);
1974 if (pathlen >= MAXPATHLEN) /* total string too long */
1975 return XFS_ERROR(ENAMETOOLONG);
1978 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1979 prid = xfs_get_projid(dp);
1981 prid = XFS_PROJID_DEFAULT;
1984 * Make sure that we have allocated dquot(s) on disk.
1986 error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
1987 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
1991 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
1992 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1994 * The symlink will fit into the inode data fork?
1995 * There can't be any attributes so we get the whole variable part.
1997 if (pathlen <= XFS_LITINO(mp))
2000 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
2001 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
2002 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
2003 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
2004 if (error == ENOSPC && fs_blocks == 0) {
2006 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
2007 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
2014 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
2015 unlock_dp_on_error = B_TRUE;
2018 * Check whether the directory allows new symlinks or not.
2020 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
2021 error = XFS_ERROR(EPERM);
2026 * Reserve disk quota : blocks and inode.
2028 error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
2033 * Check for ability to enter directory entry, if no space reserved.
2035 error = xfs_dir_canenter(tp, dp, link_name, resblks);
2039 * Initialize the bmap freelist prior to calling either
2040 * bmapi or the directory create code.
2042 xfs_bmap_init(&free_list, &first_block);
2045 * Allocate an inode for the symlink.
2047 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
2048 prid, resblks > 0, &ip, NULL);
2050 if (error == ENOSPC)
2056 * An error after we've joined dp to the transaction will result in the
2057 * transaction cancel unlocking dp so don't do it explicitly in the
2060 xfs_trans_ijoin_ref(tp, dp, XFS_ILOCK_EXCL);
2061 unlock_dp_on_error = B_FALSE;
2064 * Also attach the dquot(s) to it, if applicable.
2066 xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
2069 resblks -= XFS_IALLOC_SPACE_RES(mp);
2071 * If the symlink will fit into the inode, write it inline.
2073 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
2074 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
2075 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
2076 ip->i_d.di_size = pathlen;
2079 * The inode was initially created in extent format.
2081 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
2082 ip->i_df.if_flags |= XFS_IFINLINE;
2084 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
2085 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
2089 nmaps = SYMLINK_MAPS;
2091 error = xfs_bmapi(tp, ip, first_fsb, fs_blocks,
2092 XFS_BMAPI_WRITE | XFS_BMAPI_METADATA,
2093 &first_block, resblks, mval, &nmaps,
2099 resblks -= fs_blocks;
2100 ip->i_d.di_size = pathlen;
2101 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2103 cur_chunk = target_path;
2104 for (n = 0; n < nmaps; n++) {
2105 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
2106 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
2107 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
2108 BTOBB(byte_cnt), 0);
2109 ASSERT(bp && !XFS_BUF_GETERROR(bp));
2110 if (pathlen < byte_cnt) {
2113 pathlen -= byte_cnt;
2115 memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt);
2116 cur_chunk += byte_cnt;
2118 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
2123 * Create the directory entry for the symlink.
2125 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
2126 &first_block, &free_list, resblks);
2129 xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2130 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2133 * If this is a synchronous mount, make sure that the
2134 * symlink transaction goes to disk before returning to
2137 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2138 xfs_trans_set_sync(tp);
2141 error = xfs_bmap_finish(&tp, &free_list, &committed);
2145 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2146 xfs_qm_dqrele(udqp);
2147 xfs_qm_dqrele(gdqp);
2155 xfs_bmap_cancel(&free_list);
2156 cancel_flags |= XFS_TRANS_ABORT;
2158 xfs_trans_cancel(tp, cancel_flags);
2159 xfs_qm_dqrele(udqp);
2160 xfs_qm_dqrele(gdqp);
2162 if (unlock_dp_on_error)
2163 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2174 xfs_mount_t *mp = ip->i_mount;
2178 if (!capable(CAP_SYS_ADMIN))
2179 return XFS_ERROR(EPERM);
2181 if (XFS_FORCED_SHUTDOWN(mp))
2182 return XFS_ERROR(EIO);
2184 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
2185 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
2187 xfs_trans_cancel(tp, 0);
2190 xfs_ilock(ip, XFS_ILOCK_EXCL);
2191 xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
2193 ip->i_d.di_dmevmask = evmask;
2194 ip->i_d.di_dmstate = state;
2196 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2197 error = xfs_trans_commit(tp, 0);
2203 * xfs_alloc_file_space()
2204 * This routine allocates disk space for the given file.
2206 * If alloc_type == 0, this request is for an ALLOCSP type
2207 * request which will change the file size. In this case, no
2208 * DMAPI event will be generated by the call. A TRUNCATE event
2209 * will be generated later by xfs_setattr.
2211 * If alloc_type != 0, this request is for a RESVSP type
2212 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
2213 * lower block boundary byte address is less than the file's
2222 xfs_alloc_file_space(
2229 xfs_mount_t *mp = ip->i_mount;
2231 xfs_filblks_t allocated_fsb;
2232 xfs_filblks_t allocatesize_fsb;
2233 xfs_extlen_t extsz, temp;
2234 xfs_fileoff_t startoffset_fsb;
2235 xfs_fsblock_t firstfsb;
2241 xfs_bmbt_irec_t imaps[1], *imapp;
2242 xfs_bmap_free_t free_list;
2243 uint qblocks, resblks, resrtextents;
2247 trace_xfs_alloc_file_space(ip);
2249 if (XFS_FORCED_SHUTDOWN(mp))
2250 return XFS_ERROR(EIO);
2252 error = xfs_qm_dqattach(ip, 0);
2257 return XFS_ERROR(EINVAL);
2259 rt = XFS_IS_REALTIME_INODE(ip);
2260 extsz = xfs_get_extsz_hint(ip);
2265 bmapi_flag = XFS_BMAPI_WRITE | alloc_type;
2266 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
2267 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
2270 * Allocate file space until done or until there is an error
2272 while (allocatesize_fsb && !error) {
2276 * Determine space reservations for data/realtime.
2278 if (unlikely(extsz)) {
2279 s = startoffset_fsb;
2282 e = startoffset_fsb + allocatesize_fsb;
2283 if ((temp = do_mod(startoffset_fsb, extsz)))
2285 if ((temp = do_mod(e, extsz)))
2289 e = allocatesize_fsb;
2293 * The transaction reservation is limited to a 32-bit block
2294 * count, hence we need to limit the number of blocks we are
2295 * trying to reserve to avoid an overflow. We can't allocate
2296 * more than @nimaps extents, and an extent is limited on disk
2297 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
2299 resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
2301 resrtextents = qblocks = resblks;
2302 resrtextents /= mp->m_sb.sb_rextsize;
2303 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2304 quota_flag = XFS_QMOPT_RES_RTBLKS;
2307 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
2308 quota_flag = XFS_QMOPT_RES_REGBLKS;
2312 * Allocate and setup the transaction.
2314 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
2315 error = xfs_trans_reserve(tp, resblks,
2316 XFS_WRITE_LOG_RES(mp), resrtextents,
2317 XFS_TRANS_PERM_LOG_RES,
2318 XFS_WRITE_LOG_COUNT);
2320 * Check for running out of space
2324 * Free the transaction structure.
2326 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2327 xfs_trans_cancel(tp, 0);
2330 xfs_ilock(ip, XFS_ILOCK_EXCL);
2331 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
2336 xfs_trans_ijoin(tp, ip);
2339 * Issue the xfs_bmapi() call to allocate the blocks
2341 xfs_bmap_init(&free_list, &firstfsb);
2342 error = xfs_bmapi(tp, ip, startoffset_fsb,
2343 allocatesize_fsb, bmapi_flag,
2344 &firstfsb, 0, imapp, &nimaps,
2351 * Complete the transaction
2353 error = xfs_bmap_finish(&tp, &free_list, &committed);
2358 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2359 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2364 allocated_fsb = imapp->br_blockcount;
2367 error = XFS_ERROR(ENOSPC);
2371 startoffset_fsb += allocated_fsb;
2372 allocatesize_fsb -= allocated_fsb;
2377 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
2378 xfs_bmap_cancel(&free_list);
2379 xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
2381 error1: /* Just cancel transaction */
2382 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2383 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2388 * Zero file bytes between startoff and endoff inclusive.
2389 * The iolock is held exclusive and no blocks are buffered.
2391 * This function is used by xfs_free_file_space() to zero
2392 * partial blocks when the range to free is not block aligned.
2393 * When unreserving space with boundaries that are not block
2394 * aligned we round up the start and round down the end
2395 * boundaries and then use this function to zero the parts of
2396 * the blocks that got dropped during the rounding.
2399 xfs_zero_remaining_bytes(
2404 xfs_bmbt_irec_t imap;
2405 xfs_fileoff_t offset_fsb;
2406 xfs_off_t lastoffset;
2409 xfs_mount_t *mp = ip->i_mount;
2414 * Avoid doing I/O beyond eof - it's not necessary
2415 * since nothing can read beyond eof. The space will
2416 * be zeroed when the file is extended anyway.
2418 if (startoff >= ip->i_size)
2421 if (endoff > ip->i_size)
2422 endoff = ip->i_size;
2424 bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
2425 mp->m_rtdev_targp : mp->m_ddev_targp,
2426 mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
2428 return XFS_ERROR(ENOMEM);
2430 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
2431 offset_fsb = XFS_B_TO_FSBT(mp, offset);
2433 error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0,
2434 NULL, 0, &imap, &nimap, NULL);
2435 if (error || nimap < 1)
2437 ASSERT(imap.br_blockcount >= 1);
2438 ASSERT(imap.br_startoff == offset_fsb);
2439 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
2440 if (lastoffset > endoff)
2441 lastoffset = endoff;
2442 if (imap.br_startblock == HOLESTARTBLOCK)
2444 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2445 if (imap.br_state == XFS_EXT_UNWRITTEN)
2448 XFS_BUF_UNWRITE(bp);
2450 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
2452 error = xfs_buf_iowait(bp);
2454 xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
2455 mp, bp, XFS_BUF_ADDR(bp));
2458 memset(XFS_BUF_PTR(bp) +
2459 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
2460 0, lastoffset - offset + 1);
2465 error = xfs_buf_iowait(bp);
2467 xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
2468 mp, bp, XFS_BUF_ADDR(bp));
2477 * xfs_free_file_space()
2478 * This routine frees disk space for the given file.
2480 * This routine is only called by xfs_change_file_space
2481 * for an UNRESVSP type call.
2489 xfs_free_file_space(
2497 xfs_fileoff_t endoffset_fsb;
2499 xfs_fsblock_t firstfsb;
2500 xfs_bmap_free_t free_list;
2501 xfs_bmbt_irec_t imap;
2509 xfs_fileoff_t startoffset_fsb;
2511 int need_iolock = 1;
2515 trace_xfs_free_file_space(ip);
2517 error = xfs_qm_dqattach(ip, 0);
2522 if (len <= 0) /* if nothing being freed */
2524 rt = XFS_IS_REALTIME_INODE(ip);
2525 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
2526 endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
2528 if (attr_flags & XFS_ATTR_NOLOCK)
2531 xfs_ilock(ip, XFS_IOLOCK_EXCL);
2532 /* wait for the completion of any pending DIOs */
2536 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
2537 ioffset = offset & ~(rounding - 1);
2539 if (VN_CACHED(VFS_I(ip)) != 0) {
2540 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
2542 goto out_unlock_iolock;
2546 * Need to zero the stuff we're not freeing, on disk.
2547 * If it's a realtime file & can't use unwritten extents then we
2548 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2549 * will take care of it for us.
2551 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
2553 error = xfs_bmapi(NULL, ip, startoffset_fsb,
2554 1, 0, NULL, 0, &imap, &nimap, NULL);
2556 goto out_unlock_iolock;
2557 ASSERT(nimap == 0 || nimap == 1);
2558 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2561 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2562 block = imap.br_startblock;
2563 mod = do_div(block, mp->m_sb.sb_rextsize);
2565 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
2568 error = xfs_bmapi(NULL, ip, endoffset_fsb - 1,
2569 1, 0, NULL, 0, &imap, &nimap, NULL);
2571 goto out_unlock_iolock;
2572 ASSERT(nimap == 0 || nimap == 1);
2573 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
2574 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2576 if (mod && (mod != mp->m_sb.sb_rextsize))
2577 endoffset_fsb -= mod;
2580 if ((done = (endoffset_fsb <= startoffset_fsb)))
2582 * One contiguous piece to clear
2584 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
2587 * Some full blocks, possibly two pieces to clear
2589 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
2590 error = xfs_zero_remaining_bytes(ip, offset,
2591 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
2593 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
2594 error = xfs_zero_remaining_bytes(ip,
2595 XFS_FSB_TO_B(mp, endoffset_fsb),
2600 * free file space until done or until there is an error
2602 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2603 while (!error && !done) {
2606 * allocate and setup the transaction. Allow this
2607 * transaction to dip into the reserve blocks to ensure
2608 * the freeing of the space succeeds at ENOSPC.
2610 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
2611 tp->t_flags |= XFS_TRANS_RESERVE;
2612 error = xfs_trans_reserve(tp,
2614 XFS_WRITE_LOG_RES(mp),
2616 XFS_TRANS_PERM_LOG_RES,
2617 XFS_WRITE_LOG_COUNT);
2620 * check for running out of space
2624 * Free the transaction structure.
2626 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2627 xfs_trans_cancel(tp, 0);
2630 xfs_ilock(ip, XFS_ILOCK_EXCL);
2631 error = xfs_trans_reserve_quota(tp, mp,
2632 ip->i_udquot, ip->i_gdquot,
2633 resblks, 0, XFS_QMOPT_RES_REGBLKS);
2637 xfs_trans_ijoin(tp, ip);
2640 * issue the bunmapi() call to free the blocks
2642 xfs_bmap_init(&free_list, &firstfsb);
2643 error = xfs_bunmapi(tp, ip, startoffset_fsb,
2644 endoffset_fsb - startoffset_fsb,
2645 0, 2, &firstfsb, &free_list, &done);
2651 * complete the transaction
2653 error = xfs_bmap_finish(&tp, &free_list, &committed);
2658 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2659 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2664 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
2668 xfs_bmap_cancel(&free_list);
2670 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2671 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
2677 * xfs_change_file_space()
2678 * This routine allocates or frees disk space for the given file.
2679 * The user specified parameters are checked for alignment and size
2688 xfs_change_file_space(
2695 xfs_mount_t *mp = ip->i_mount;
2700 xfs_off_t startoffset;
2706 if (!S_ISREG(ip->i_d.di_mode))
2707 return XFS_ERROR(EINVAL);
2709 switch (bf->l_whence) {
2710 case 0: /*SEEK_SET*/
2712 case 1: /*SEEK_CUR*/
2713 bf->l_start += offset;
2715 case 2: /*SEEK_END*/
2716 bf->l_start += ip->i_size;
2719 return XFS_ERROR(EINVAL);
2722 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
2724 if ( (bf->l_start < 0)
2725 || (bf->l_start > XFS_MAXIOFFSET(mp))
2726 || (bf->l_start + llen < 0)
2727 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
2728 return XFS_ERROR(EINVAL);
2732 startoffset = bf->l_start;
2736 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2738 * These calls do NOT zero the data space allocated to the file,
2739 * nor do they change the file size.
2741 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2743 * These calls cause the new file data to be zeroed and the file
2744 * size to be changed.
2746 setprealloc = clrprealloc = 0;
2747 prealloc_type = XFS_BMAPI_PREALLOC;
2750 case XFS_IOC_ZERO_RANGE:
2751 prealloc_type |= XFS_BMAPI_CONVERT;
2752 xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0);
2754 case XFS_IOC_RESVSP:
2755 case XFS_IOC_RESVSP64:
2756 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
2757 prealloc_type, attr_flags);
2763 case XFS_IOC_UNRESVSP:
2764 case XFS_IOC_UNRESVSP64:
2765 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
2770 case XFS_IOC_ALLOCSP:
2771 case XFS_IOC_ALLOCSP64:
2772 case XFS_IOC_FREESP:
2773 case XFS_IOC_FREESP64:
2774 if (startoffset > fsize) {
2775 error = xfs_alloc_file_space(ip, fsize,
2776 startoffset - fsize, 0, attr_flags);
2781 iattr.ia_valid = ATTR_SIZE;
2782 iattr.ia_size = startoffset;
2784 error = xfs_setattr(ip, &iattr, attr_flags);
2794 return XFS_ERROR(EINVAL);
2798 * update the inode timestamp, mode, and prealloc flag bits
2800 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
2802 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
2805 xfs_trans_cancel(tp, 0);
2809 xfs_ilock(ip, XFS_ILOCK_EXCL);
2811 xfs_trans_ijoin(tp, ip);
2813 if ((attr_flags & XFS_ATTR_DMI) == 0) {
2814 ip->i_d.di_mode &= ~S_ISUID;
2817 * Note that we don't have to worry about mandatory
2818 * file locking being disabled here because we only
2819 * clear the S_ISGID bit if the Group execute bit is
2820 * on, but if it was on then mandatory locking wouldn't
2821 * have been enabled.
2823 if (ip->i_d.di_mode & S_IXGRP)
2824 ip->i_d.di_mode &= ~S_ISGID;
2826 xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2829 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
2830 else if (clrprealloc)
2831 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
2833 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2834 if (attr_flags & XFS_ATTR_SYNC)
2835 xfs_trans_set_sync(tp);
2837 error = xfs_trans_commit(tp, 0);
2839 xfs_iunlock(ip, XFS_ILOCK_EXCL);