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[linux-2.6/kvm.git] / fs / xfs / xfs_vnodeops.c
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1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
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
19 #include "xfs.h"
20 #include "xfs_fs.h"
21 #include "xfs_types.h"
22 #include "xfs_bit.h"
23 #include "xfs_log.h"
24 #include "xfs_inum.h"
25 #include "xfs_trans.h"
26 #include "xfs_sb.h"
27 #include "xfs_ag.h"
28 #include "xfs_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_da_btree.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_inode_item.h"
40 #include "xfs_itable.h"
41 #include "xfs_btree.h"
42 #include "xfs_ialloc.h"
43 #include "xfs_alloc.h"
44 #include "xfs_bmap.h"
45 #include "xfs_attr.h"
46 #include "xfs_rw.h"
47 #include "xfs_error.h"
48 #include "xfs_quota.h"
49 #include "xfs_utils.h"
50 #include "xfs_rtalloc.h"
51 #include "xfs_trans_space.h"
52 #include "xfs_log_priv.h"
53 #include "xfs_filestream.h"
54 #include "xfs_vnodeops.h"
56 int
57 xfs_setattr(
58 struct xfs_inode *ip,
59 struct iattr *iattr,
60 int flags)
62 xfs_mount_t *mp = ip->i_mount;
63 struct inode *inode = VFS_I(ip);
64 int mask = iattr->ia_valid;
65 xfs_trans_t *tp;
66 int code;
67 uint lock_flags;
68 uint commit_flags=0;
69 uid_t uid=0, iuid=0;
70 gid_t gid=0, igid=0;
71 int timeflags = 0;
72 struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2;
73 int need_iolock = 1;
75 xfs_itrace_entry(ip);
77 if (mp->m_flags & XFS_MOUNT_RDONLY)
78 return XFS_ERROR(EROFS);
80 if (XFS_FORCED_SHUTDOWN(mp))
81 return XFS_ERROR(EIO);
83 code = -inode_change_ok(inode, iattr);
84 if (code)
85 return code;
87 olddquot1 = olddquot2 = NULL;
88 udqp = gdqp = NULL;
91 * If disk quotas is on, we make sure that the dquots do exist on disk,
92 * before we start any other transactions. Trying to do this later
93 * is messy. We don't care to take a readlock to look at the ids
94 * in inode here, because we can't hold it across the trans_reserve.
95 * If the IDs do change before we take the ilock, we're covered
96 * because the i_*dquot fields will get updated anyway.
98 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
99 uint qflags = 0;
101 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
102 uid = iattr->ia_uid;
103 qflags |= XFS_QMOPT_UQUOTA;
104 } else {
105 uid = ip->i_d.di_uid;
107 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
108 gid = iattr->ia_gid;
109 qflags |= XFS_QMOPT_GQUOTA;
110 } else {
111 gid = ip->i_d.di_gid;
115 * We take a reference when we initialize udqp and gdqp,
116 * so it is important that we never blindly double trip on
117 * the same variable. See xfs_create() for an example.
119 ASSERT(udqp == NULL);
120 ASSERT(gdqp == NULL);
121 code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, ip->i_d.di_projid,
122 qflags, &udqp, &gdqp);
123 if (code)
124 return code;
128 * For the other attributes, we acquire the inode lock and
129 * first do an error checking pass.
131 tp = NULL;
132 lock_flags = XFS_ILOCK_EXCL;
133 if (flags & XFS_ATTR_NOLOCK)
134 need_iolock = 0;
135 if (!(mask & ATTR_SIZE)) {
136 if ((mask != (ATTR_CTIME|ATTR_ATIME|ATTR_MTIME)) ||
137 (mp->m_flags & XFS_MOUNT_WSYNC)) {
138 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
139 commit_flags = 0;
140 if ((code = xfs_trans_reserve(tp, 0,
141 XFS_ICHANGE_LOG_RES(mp), 0,
142 0, 0))) {
143 lock_flags = 0;
144 goto error_return;
147 } else {
148 if (DM_EVENT_ENABLED(ip, DM_EVENT_TRUNCATE) &&
149 !(flags & XFS_ATTR_DMI)) {
150 int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR;
151 code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, ip,
152 iattr->ia_size, 0, dmflags, NULL);
153 if (code) {
154 lock_flags = 0;
155 goto error_return;
158 if (need_iolock)
159 lock_flags |= XFS_IOLOCK_EXCL;
162 xfs_ilock(ip, lock_flags);
165 * Change file ownership. Must be the owner or privileged.
167 if (mask & (ATTR_UID|ATTR_GID)) {
169 * These IDs could have changed since we last looked at them.
170 * But, we're assured that if the ownership did change
171 * while we didn't have the inode locked, inode's dquot(s)
172 * would have changed also.
174 iuid = ip->i_d.di_uid;
175 igid = ip->i_d.di_gid;
176 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
177 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
180 * Do a quota reservation only if uid/gid is actually
181 * going to change.
183 if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
184 (XFS_IS_GQUOTA_ON(mp) && igid != gid)) {
185 ASSERT(tp);
186 code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp,
187 capable(CAP_FOWNER) ?
188 XFS_QMOPT_FORCE_RES : 0);
189 if (code) /* out of quota */
190 goto error_return;
195 * Truncate file. Must have write permission and not be a directory.
197 if (mask & ATTR_SIZE) {
198 /* Short circuit the truncate case for zero length files */
199 if (iattr->ia_size == 0 &&
200 ip->i_size == 0 && ip->i_d.di_nextents == 0) {
201 xfs_iunlock(ip, XFS_ILOCK_EXCL);
202 lock_flags &= ~XFS_ILOCK_EXCL;
203 if (mask & ATTR_CTIME)
204 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
205 code = 0;
206 goto error_return;
209 if (S_ISDIR(ip->i_d.di_mode)) {
210 code = XFS_ERROR(EISDIR);
211 goto error_return;
212 } else if (!S_ISREG(ip->i_d.di_mode)) {
213 code = XFS_ERROR(EINVAL);
214 goto error_return;
218 * Make sure that the dquots are attached to the inode.
220 code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
221 if (code)
222 goto error_return;
225 * Now we can make the changes. Before we join the inode
226 * to the transaction, if ATTR_SIZE is set then take care of
227 * the part of the truncation that must be done without the
228 * inode lock. This needs to be done before joining the inode
229 * to the transaction, because the inode cannot be unlocked
230 * once it is a part of the transaction.
232 if (iattr->ia_size > ip->i_size) {
234 * Do the first part of growing a file: zero any data
235 * in the last block that is beyond the old EOF. We
236 * need to do this before the inode is joined to the
237 * transaction to modify the i_size.
239 code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);
241 xfs_iunlock(ip, XFS_ILOCK_EXCL);
244 * We are going to log the inode size change in this
245 * transaction so any previous writes that are beyond the on
246 * disk EOF and the new EOF that have not been written out need
247 * to be written here. If we do not write the data out, we
248 * expose ourselves to the null files problem.
250 * Only flush from the on disk size to the smaller of the in
251 * memory file size or the new size as that's the range we
252 * really care about here and prevents waiting for other data
253 * not within the range we care about here.
255 if (!code &&
256 ip->i_size != ip->i_d.di_size &&
257 iattr->ia_size > ip->i_d.di_size) {
258 code = xfs_flush_pages(ip,
259 ip->i_d.di_size, iattr->ia_size,
260 XFS_B_ASYNC, FI_NONE);
263 /* wait for all I/O to complete */
264 xfs_ioend_wait(ip);
266 if (!code)
267 code = xfs_itruncate_data(ip, iattr->ia_size);
268 if (code) {
269 ASSERT(tp == NULL);
270 lock_flags &= ~XFS_ILOCK_EXCL;
271 ASSERT(lock_flags == XFS_IOLOCK_EXCL);
272 goto error_return;
274 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
275 if ((code = xfs_trans_reserve(tp, 0,
276 XFS_ITRUNCATE_LOG_RES(mp), 0,
277 XFS_TRANS_PERM_LOG_RES,
278 XFS_ITRUNCATE_LOG_COUNT))) {
279 xfs_trans_cancel(tp, 0);
280 if (need_iolock)
281 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
282 return code;
284 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
285 xfs_ilock(ip, XFS_ILOCK_EXCL);
287 xfs_trans_ijoin(tp, ip, lock_flags);
288 xfs_trans_ihold(tp, ip);
291 * Only change the c/mtime if we are changing the size
292 * or we are explicitly asked to change it. This handles
293 * the semantic difference between truncate() and ftruncate()
294 * as implemented in the VFS.
296 if (iattr->ia_size != ip->i_size || (mask & ATTR_CTIME))
297 timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
299 if (iattr->ia_size > ip->i_size) {
300 ip->i_d.di_size = iattr->ia_size;
301 ip->i_size = iattr->ia_size;
302 if (!(flags & XFS_ATTR_DMI))
303 xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
304 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
305 } else if (iattr->ia_size <= ip->i_size ||
306 (iattr->ia_size == 0 && ip->i_d.di_nextents)) {
308 * signal a sync transaction unless
309 * we're truncating an already unlinked
310 * file on a wsync filesystem
312 code = xfs_itruncate_finish(&tp, ip, iattr->ia_size,
313 XFS_DATA_FORK,
314 ((ip->i_d.di_nlink != 0 ||
315 !(mp->m_flags & XFS_MOUNT_WSYNC))
316 ? 1 : 0));
317 if (code)
318 goto abort_return;
320 * Truncated "down", so we're removing references
321 * to old data here - if we now delay flushing for
322 * a long time, we expose ourselves unduly to the
323 * notorious NULL files problem. So, we mark this
324 * vnode and flush it when the file is closed, and
325 * do not wait the usual (long) time for writeout.
327 xfs_iflags_set(ip, XFS_ITRUNCATED);
329 } else if (tp) {
330 xfs_trans_ijoin(tp, ip, lock_flags);
331 xfs_trans_ihold(tp, ip);
335 * Change file ownership. Must be the owner or privileged.
337 if (mask & (ATTR_UID|ATTR_GID)) {
339 * CAP_FSETID overrides the following restrictions:
341 * The set-user-ID and set-group-ID bits of a file will be
342 * cleared upon successful return from chown()
344 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
345 !capable(CAP_FSETID)) {
346 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
350 * Change the ownerships and register quota modifications
351 * in the transaction.
353 if (iuid != uid) {
354 if (XFS_IS_UQUOTA_ON(mp)) {
355 ASSERT(mask & ATTR_UID);
356 ASSERT(udqp);
357 olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
358 &ip->i_udquot, udqp);
360 ip->i_d.di_uid = uid;
361 inode->i_uid = uid;
363 if (igid != gid) {
364 if (XFS_IS_GQUOTA_ON(mp)) {
365 ASSERT(!XFS_IS_PQUOTA_ON(mp));
366 ASSERT(mask & ATTR_GID);
367 ASSERT(gdqp);
368 olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
369 &ip->i_gdquot, gdqp);
371 ip->i_d.di_gid = gid;
372 inode->i_gid = gid;
375 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
376 timeflags |= XFS_ICHGTIME_CHG;
380 * Change file access modes.
382 if (mask & ATTR_MODE) {
383 umode_t mode = iattr->ia_mode;
385 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
386 mode &= ~S_ISGID;
388 ip->i_d.di_mode &= S_IFMT;
389 ip->i_d.di_mode |= mode & ~S_IFMT;
391 inode->i_mode &= S_IFMT;
392 inode->i_mode |= mode & ~S_IFMT;
394 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
395 timeflags |= XFS_ICHGTIME_CHG;
399 * Change file access or modified times.
401 if (mask & (ATTR_ATIME|ATTR_MTIME)) {
402 if (mask & ATTR_ATIME) {
403 inode->i_atime = iattr->ia_atime;
404 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
405 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
406 ip->i_update_core = 1;
408 if (mask & ATTR_MTIME) {
409 inode->i_mtime = iattr->ia_mtime;
410 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
411 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
412 timeflags &= ~XFS_ICHGTIME_MOD;
413 timeflags |= XFS_ICHGTIME_CHG;
415 if (tp && (mask & (ATTR_MTIME_SET|ATTR_ATIME_SET)))
416 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
420 * Change file inode change time only if ATTR_CTIME set
421 * AND we have been called by a DMI function.
424 if ((flags & XFS_ATTR_DMI) && (mask & ATTR_CTIME)) {
425 inode->i_ctime = iattr->ia_ctime;
426 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
427 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
428 ip->i_update_core = 1;
429 timeflags &= ~XFS_ICHGTIME_CHG;
433 * Send out timestamp changes that need to be set to the
434 * current time. Not done when called by a DMI function.
436 if (timeflags && !(flags & XFS_ATTR_DMI))
437 xfs_ichgtime(ip, timeflags);
439 XFS_STATS_INC(xs_ig_attrchg);
442 * If this is a synchronous mount, make sure that the
443 * transaction goes to disk before returning to the user.
444 * This is slightly sub-optimal in that truncates require
445 * two sync transactions instead of one for wsync filesystems.
446 * One for the truncate and one for the timestamps since we
447 * don't want to change the timestamps unless we're sure the
448 * truncate worked. Truncates are less than 1% of the laddis
449 * mix so this probably isn't worth the trouble to optimize.
451 code = 0;
452 if (tp) {
453 if (mp->m_flags & XFS_MOUNT_WSYNC)
454 xfs_trans_set_sync(tp);
456 code = xfs_trans_commit(tp, commit_flags);
459 xfs_iunlock(ip, lock_flags);
462 * Release any dquot(s) the inode had kept before chown.
464 XFS_QM_DQRELE(mp, olddquot1);
465 XFS_QM_DQRELE(mp, olddquot2);
466 XFS_QM_DQRELE(mp, udqp);
467 XFS_QM_DQRELE(mp, gdqp);
469 if (code) {
470 return code;
473 if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE) &&
474 !(flags & XFS_ATTR_DMI)) {
475 (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, ip, DM_RIGHT_NULL,
476 NULL, DM_RIGHT_NULL, NULL, NULL,
477 0, 0, AT_DELAY_FLAG(flags));
479 return 0;
481 abort_return:
482 commit_flags |= XFS_TRANS_ABORT;
483 /* FALLTHROUGH */
484 error_return:
485 XFS_QM_DQRELE(mp, udqp);
486 XFS_QM_DQRELE(mp, gdqp);
487 if (tp) {
488 xfs_trans_cancel(tp, commit_flags);
490 if (lock_flags != 0) {
491 xfs_iunlock(ip, lock_flags);
493 return code;
497 * The maximum pathlen is 1024 bytes. Since the minimum file system
498 * blocksize is 512 bytes, we can get a max of 2 extents back from
499 * bmapi.
501 #define SYMLINK_MAPS 2
503 STATIC int
504 xfs_readlink_bmap(
505 xfs_inode_t *ip,
506 char *link)
508 xfs_mount_t *mp = ip->i_mount;
509 int pathlen = ip->i_d.di_size;
510 int nmaps = SYMLINK_MAPS;
511 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
512 xfs_daddr_t d;
513 int byte_cnt;
514 int n;
515 xfs_buf_t *bp;
516 int error = 0;
518 error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0,
519 mval, &nmaps, NULL, NULL);
520 if (error)
521 goto out;
523 for (n = 0; n < nmaps; n++) {
524 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
525 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
527 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
528 error = XFS_BUF_GETERROR(bp);
529 if (error) {
530 xfs_ioerror_alert("xfs_readlink",
531 ip->i_mount, bp, XFS_BUF_ADDR(bp));
532 xfs_buf_relse(bp);
533 goto out;
535 if (pathlen < byte_cnt)
536 byte_cnt = pathlen;
537 pathlen -= byte_cnt;
539 memcpy(link, XFS_BUF_PTR(bp), byte_cnt);
540 xfs_buf_relse(bp);
543 link[ip->i_d.di_size] = '\0';
544 error = 0;
546 out:
547 return error;
551 xfs_readlink(
552 xfs_inode_t *ip,
553 char *link)
555 xfs_mount_t *mp = ip->i_mount;
556 int pathlen;
557 int error = 0;
559 xfs_itrace_entry(ip);
561 if (XFS_FORCED_SHUTDOWN(mp))
562 return XFS_ERROR(EIO);
564 xfs_ilock(ip, XFS_ILOCK_SHARED);
566 ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
567 ASSERT(ip->i_d.di_size <= MAXPATHLEN);
569 pathlen = ip->i_d.di_size;
570 if (!pathlen)
571 goto out;
573 if (ip->i_df.if_flags & XFS_IFINLINE) {
574 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
575 link[pathlen] = '\0';
576 } else {
577 error = xfs_readlink_bmap(ip, link);
580 out:
581 xfs_iunlock(ip, XFS_ILOCK_SHARED);
582 return error;
586 * xfs_fsync
588 * This is called to sync the inode and its data out to disk. We need to hold
589 * the I/O lock while flushing the data, and the inode lock while flushing the
590 * inode. The inode lock CANNOT be held while flushing the data, so acquire
591 * after we're done with that.
594 xfs_fsync(
595 xfs_inode_t *ip)
597 xfs_trans_t *tp;
598 int error;
599 int log_flushed = 0, changed = 1;
601 xfs_itrace_entry(ip);
603 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
604 return XFS_ERROR(EIO);
606 /* capture size updates in I/O completion before writing the inode. */
607 error = xfs_wait_on_pages(ip, 0, -1);
608 if (error)
609 return XFS_ERROR(error);
612 * We always need to make sure that the required inode state is safe on
613 * disk. The vnode might be clean but we still might need to force the
614 * log because of committed transactions that haven't hit the disk yet.
615 * Likewise, there could be unflushed non-transactional changes to the
616 * inode core that have to go to disk and this requires us to issue
617 * a synchronous transaction to capture these changes correctly.
619 * This code relies on the assumption that if the update_* fields
620 * of the inode are clear and the inode is unpinned then it is clean
621 * and no action is required.
623 xfs_ilock(ip, XFS_ILOCK_SHARED);
625 if (!(ip->i_update_size || ip->i_update_core)) {
627 * Timestamps/size haven't changed since last inode flush or
628 * inode transaction commit. That means either nothing got
629 * written or a transaction committed which caught the updates.
630 * If the latter happened and the transaction hasn't hit the
631 * disk yet, the inode will be still be pinned. If it is,
632 * force the log.
635 xfs_iunlock(ip, XFS_ILOCK_SHARED);
637 if (xfs_ipincount(ip)) {
638 error = _xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
639 XFS_LOG_FORCE | XFS_LOG_SYNC,
640 &log_flushed);
641 } else {
643 * If the inode is not pinned and nothing has changed
644 * we don't need to flush the cache.
646 changed = 0;
648 } else {
650 * Kick off a transaction to log the inode core to get the
651 * updates. The sync transaction will also force the log.
653 xfs_iunlock(ip, XFS_ILOCK_SHARED);
654 tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
655 error = xfs_trans_reserve(tp, 0,
656 XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
657 if (error) {
658 xfs_trans_cancel(tp, 0);
659 return error;
661 xfs_ilock(ip, XFS_ILOCK_EXCL);
664 * Note - it's possible that we might have pushed ourselves out
665 * of the way during trans_reserve which would flush the inode.
666 * But there's no guarantee that the inode buffer has actually
667 * gone out yet (it's delwri). Plus the buffer could be pinned
668 * anyway if it's part of an inode in another recent
669 * transaction. So we play it safe and fire off the
670 * transaction anyway.
672 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
673 xfs_trans_ihold(tp, ip);
674 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
675 xfs_trans_set_sync(tp);
676 error = _xfs_trans_commit(tp, 0, &log_flushed);
678 xfs_iunlock(ip, XFS_ILOCK_EXCL);
681 if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
683 * If the log write didn't issue an ordered tag we need
684 * to flush the disk cache for the data device now.
686 if (!log_flushed)
687 xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
690 * If this inode is on the RT dev we need to flush that
691 * cache as well.
693 if (XFS_IS_REALTIME_INODE(ip))
694 xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
697 return error;
701 * This is called by xfs_inactive to free any blocks beyond eof
702 * when the link count isn't zero and by xfs_dm_punch_hole() when
703 * punching a hole to EOF.
706 xfs_free_eofblocks(
707 xfs_mount_t *mp,
708 xfs_inode_t *ip,
709 int flags)
711 xfs_trans_t *tp;
712 int error;
713 xfs_fileoff_t end_fsb;
714 xfs_fileoff_t last_fsb;
715 xfs_filblks_t map_len;
716 int nimaps;
717 xfs_bmbt_irec_t imap;
718 int use_iolock = (flags & XFS_FREE_EOF_LOCK);
721 * Figure out if there are any blocks beyond the end
722 * of the file. If not, then there is nothing to do.
724 end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
725 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
726 map_len = last_fsb - end_fsb;
727 if (map_len <= 0)
728 return 0;
730 nimaps = 1;
731 xfs_ilock(ip, XFS_ILOCK_SHARED);
732 error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0,
733 NULL, 0, &imap, &nimaps, NULL, NULL);
734 xfs_iunlock(ip, XFS_ILOCK_SHARED);
736 if (!error && (nimaps != 0) &&
737 (imap.br_startblock != HOLESTARTBLOCK ||
738 ip->i_delayed_blks)) {
740 * Attach the dquots to the inode up front.
742 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
743 return error;
746 * There are blocks after the end of file.
747 * Free them up now by truncating the file to
748 * its current size.
750 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
753 * Do the xfs_itruncate_start() call before
754 * reserving any log space because
755 * itruncate_start will call into the buffer
756 * cache and we can't
757 * do that within a transaction.
759 if (use_iolock)
760 xfs_ilock(ip, XFS_IOLOCK_EXCL);
761 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
762 ip->i_size);
763 if (error) {
764 xfs_trans_cancel(tp, 0);
765 if (use_iolock)
766 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
767 return error;
770 error = xfs_trans_reserve(tp, 0,
771 XFS_ITRUNCATE_LOG_RES(mp),
772 0, XFS_TRANS_PERM_LOG_RES,
773 XFS_ITRUNCATE_LOG_COUNT);
774 if (error) {
775 ASSERT(XFS_FORCED_SHUTDOWN(mp));
776 xfs_trans_cancel(tp, 0);
777 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
778 return error;
781 xfs_ilock(ip, XFS_ILOCK_EXCL);
782 xfs_trans_ijoin(tp, ip,
783 XFS_IOLOCK_EXCL |
784 XFS_ILOCK_EXCL);
785 xfs_trans_ihold(tp, ip);
787 error = xfs_itruncate_finish(&tp, ip,
788 ip->i_size,
789 XFS_DATA_FORK,
792 * If we get an error at this point we
793 * simply don't bother truncating the file.
795 if (error) {
796 xfs_trans_cancel(tp,
797 (XFS_TRANS_RELEASE_LOG_RES |
798 XFS_TRANS_ABORT));
799 } else {
800 error = xfs_trans_commit(tp,
801 XFS_TRANS_RELEASE_LOG_RES);
803 xfs_iunlock(ip, (use_iolock ? (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)
804 : XFS_ILOCK_EXCL));
806 return error;
810 * Free a symlink that has blocks associated with it.
812 STATIC int
813 xfs_inactive_symlink_rmt(
814 xfs_inode_t *ip,
815 xfs_trans_t **tpp)
817 xfs_buf_t *bp;
818 int committed;
819 int done;
820 int error;
821 xfs_fsblock_t first_block;
822 xfs_bmap_free_t free_list;
823 int i;
824 xfs_mount_t *mp;
825 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
826 int nmaps;
827 xfs_trans_t *ntp;
828 int size;
829 xfs_trans_t *tp;
831 tp = *tpp;
832 mp = ip->i_mount;
833 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
835 * We're freeing a symlink that has some
836 * blocks allocated to it. Free the
837 * blocks here. We know that we've got
838 * either 1 or 2 extents and that we can
839 * free them all in one bunmapi call.
841 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
842 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
843 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
844 ASSERT(XFS_FORCED_SHUTDOWN(mp));
845 xfs_trans_cancel(tp, 0);
846 *tpp = NULL;
847 return error;
850 * Lock the inode, fix the size, and join it to the transaction.
851 * Hold it so in the normal path, we still have it locked for
852 * the second transaction. In the error paths we need it
853 * held so the cancel won't rele it, see below.
855 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
856 size = (int)ip->i_d.di_size;
857 ip->i_d.di_size = 0;
858 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
859 xfs_trans_ihold(tp, ip);
860 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
862 * Find the block(s) so we can inval and unmap them.
864 done = 0;
865 xfs_bmap_init(&free_list, &first_block);
866 nmaps = ARRAY_SIZE(mval);
867 if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
868 XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
869 &free_list, NULL)))
870 goto error0;
872 * Invalidate the block(s).
874 for (i = 0; i < nmaps; i++) {
875 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
876 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
877 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
878 xfs_trans_binval(tp, bp);
881 * Unmap the dead block(s) to the free_list.
883 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
884 &first_block, &free_list, NULL, &done)))
885 goto error1;
886 ASSERT(done);
888 * Commit the first transaction. This logs the EFI and the inode.
890 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
891 goto error1;
893 * The transaction must have been committed, since there were
894 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
895 * The new tp has the extent freeing and EFDs.
897 ASSERT(committed);
899 * The first xact was committed, so add the inode to the new one.
900 * Mark it dirty so it will be logged and moved forward in the log as
901 * part of every commit.
903 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
904 xfs_trans_ihold(tp, ip);
905 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
907 * Get a new, empty transaction to return to our caller.
909 ntp = xfs_trans_dup(tp);
911 * Commit the transaction containing extent freeing and EFDs.
912 * If we get an error on the commit here or on the reserve below,
913 * we need to unlock the inode since the new transaction doesn't
914 * have the inode attached.
916 error = xfs_trans_commit(tp, 0);
917 tp = ntp;
918 if (error) {
919 ASSERT(XFS_FORCED_SHUTDOWN(mp));
920 goto error0;
923 * transaction commit worked ok so we can drop the extra ticket
924 * reference that we gained in xfs_trans_dup()
926 xfs_log_ticket_put(tp->t_ticket);
929 * Remove the memory for extent descriptions (just bookkeeping).
931 if (ip->i_df.if_bytes)
932 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
933 ASSERT(ip->i_df.if_bytes == 0);
935 * Put an itruncate log reservation in the new transaction
936 * for our caller.
938 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
939 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
940 ASSERT(XFS_FORCED_SHUTDOWN(mp));
941 goto error0;
944 * Return with the inode locked but not joined to the transaction.
946 *tpp = tp;
947 return 0;
949 error1:
950 xfs_bmap_cancel(&free_list);
951 error0:
953 * Have to come here with the inode locked and either
954 * (held and in the transaction) or (not in the transaction).
955 * If the inode isn't held then cancel would iput it, but
956 * that's wrong since this is inactive and the vnode ref
957 * count is 0 already.
958 * Cancel won't do anything to the inode if held, but it still
959 * needs to be locked until the cancel is done, if it was
960 * joined to the transaction.
962 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
963 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
964 *tpp = NULL;
965 return error;
969 STATIC int
970 xfs_inactive_symlink_local(
971 xfs_inode_t *ip,
972 xfs_trans_t **tpp)
974 int error;
976 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
978 * We're freeing a symlink which fit into
979 * the inode. Just free the memory used
980 * to hold the old symlink.
982 error = xfs_trans_reserve(*tpp, 0,
983 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
984 0, XFS_TRANS_PERM_LOG_RES,
985 XFS_ITRUNCATE_LOG_COUNT);
987 if (error) {
988 xfs_trans_cancel(*tpp, 0);
989 *tpp = NULL;
990 return error;
992 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
995 * Zero length symlinks _can_ exist.
997 if (ip->i_df.if_bytes > 0) {
998 xfs_idata_realloc(ip,
999 -(ip->i_df.if_bytes),
1000 XFS_DATA_FORK);
1001 ASSERT(ip->i_df.if_bytes == 0);
1003 return 0;
1006 STATIC int
1007 xfs_inactive_attrs(
1008 xfs_inode_t *ip,
1009 xfs_trans_t **tpp)
1011 xfs_trans_t *tp;
1012 int error;
1013 xfs_mount_t *mp;
1015 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
1016 tp = *tpp;
1017 mp = ip->i_mount;
1018 ASSERT(ip->i_d.di_forkoff != 0);
1019 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1020 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1021 if (error)
1022 goto error_unlock;
1024 error = xfs_attr_inactive(ip);
1025 if (error)
1026 goto error_unlock;
1028 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1029 error = xfs_trans_reserve(tp, 0,
1030 XFS_IFREE_LOG_RES(mp),
1031 0, XFS_TRANS_PERM_LOG_RES,
1032 XFS_INACTIVE_LOG_COUNT);
1033 if (error)
1034 goto error_cancel;
1036 xfs_ilock(ip, XFS_ILOCK_EXCL);
1037 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1038 xfs_trans_ihold(tp, ip);
1039 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1041 ASSERT(ip->i_d.di_anextents == 0);
1043 *tpp = tp;
1044 return 0;
1046 error_cancel:
1047 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1048 xfs_trans_cancel(tp, 0);
1049 error_unlock:
1050 *tpp = NULL;
1051 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1052 return error;
1056 xfs_release(
1057 xfs_inode_t *ip)
1059 xfs_mount_t *mp = ip->i_mount;
1060 int error;
1062 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
1063 return 0;
1065 /* If this is a read-only mount, don't do this (would generate I/O) */
1066 if (mp->m_flags & XFS_MOUNT_RDONLY)
1067 return 0;
1069 if (!XFS_FORCED_SHUTDOWN(mp)) {
1070 int truncated;
1073 * If we are using filestreams, and we have an unlinked
1074 * file that we are processing the last close on, then nothing
1075 * will be able to reopen and write to this file. Purge this
1076 * inode from the filestreams cache so that it doesn't delay
1077 * teardown of the inode.
1079 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
1080 xfs_filestream_deassociate(ip);
1083 * If we previously truncated this file and removed old data
1084 * in the process, we want to initiate "early" writeout on
1085 * the last close. This is an attempt to combat the notorious
1086 * NULL files problem which is particularly noticable from a
1087 * truncate down, buffered (re-)write (delalloc), followed by
1088 * a crash. What we are effectively doing here is
1089 * significantly reducing the time window where we'd otherwise
1090 * be exposed to that problem.
1092 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
1093 if (truncated && VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
1094 xfs_flush_pages(ip, 0, -1, XFS_B_ASYNC, FI_NONE);
1097 if (ip->i_d.di_nlink != 0) {
1098 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1099 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
1100 ip->i_delayed_blks > 0)) &&
1101 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
1102 (!(ip->i_d.di_flags &
1103 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
1104 error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK);
1105 if (error)
1106 return error;
1110 return 0;
1114 * xfs_inactive
1116 * This is called when the vnode reference count for the vnode
1117 * goes to zero. If the file has been unlinked, then it must
1118 * now be truncated. Also, we clear all of the read-ahead state
1119 * kept for the inode here since the file is now closed.
1122 xfs_inactive(
1123 xfs_inode_t *ip)
1125 xfs_bmap_free_t free_list;
1126 xfs_fsblock_t first_block;
1127 int committed;
1128 xfs_trans_t *tp;
1129 xfs_mount_t *mp;
1130 int error;
1131 int truncate;
1133 xfs_itrace_entry(ip);
1136 * If the inode is already free, then there can be nothing
1137 * to clean up here.
1139 if (ip->i_d.di_mode == 0 || VN_BAD(VFS_I(ip))) {
1140 ASSERT(ip->i_df.if_real_bytes == 0);
1141 ASSERT(ip->i_df.if_broot_bytes == 0);
1142 return VN_INACTIVE_CACHE;
1146 * Only do a truncate if it's a regular file with
1147 * some actual space in it. It's OK to look at the
1148 * inode's fields without the lock because we're the
1149 * only one with a reference to the inode.
1151 truncate = ((ip->i_d.di_nlink == 0) &&
1152 ((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
1153 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
1154 ((ip->i_d.di_mode & S_IFMT) == S_IFREG));
1156 mp = ip->i_mount;
1158 if (ip->i_d.di_nlink == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_DESTROY))
1159 XFS_SEND_DESTROY(mp, ip, DM_RIGHT_NULL);
1161 error = 0;
1163 /* If this is a read-only mount, don't do this (would generate I/O) */
1164 if (mp->m_flags & XFS_MOUNT_RDONLY)
1165 goto out;
1167 if (ip->i_d.di_nlink != 0) {
1168 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1169 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
1170 ip->i_delayed_blks > 0)) &&
1171 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
1172 (!(ip->i_d.di_flags &
1173 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
1174 (ip->i_delayed_blks != 0)))) {
1175 error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK);
1176 if (error)
1177 return VN_INACTIVE_CACHE;
1179 goto out;
1182 ASSERT(ip->i_d.di_nlink == 0);
1184 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
1185 return VN_INACTIVE_CACHE;
1187 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1188 if (truncate) {
1190 * Do the xfs_itruncate_start() call before
1191 * reserving any log space because itruncate_start
1192 * will call into the buffer cache and we can't
1193 * do that within a transaction.
1195 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1197 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
1198 if (error) {
1199 xfs_trans_cancel(tp, 0);
1200 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1201 return VN_INACTIVE_CACHE;
1204 error = xfs_trans_reserve(tp, 0,
1205 XFS_ITRUNCATE_LOG_RES(mp),
1206 0, XFS_TRANS_PERM_LOG_RES,
1207 XFS_ITRUNCATE_LOG_COUNT);
1208 if (error) {
1209 /* Don't call itruncate_cleanup */
1210 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1211 xfs_trans_cancel(tp, 0);
1212 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1213 return VN_INACTIVE_CACHE;
1216 xfs_ilock(ip, XFS_ILOCK_EXCL);
1217 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1218 xfs_trans_ihold(tp, ip);
1221 * normally, we have to run xfs_itruncate_finish sync.
1222 * But if filesystem is wsync and we're in the inactive
1223 * path, then we know that nlink == 0, and that the
1224 * xaction that made nlink == 0 is permanently committed
1225 * since xfs_remove runs as a synchronous transaction.
1227 error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK,
1228 (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0));
1230 if (error) {
1231 xfs_trans_cancel(tp,
1232 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1233 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1234 return VN_INACTIVE_CACHE;
1236 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) {
1239 * If we get an error while cleaning up a
1240 * symlink we bail out.
1242 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
1243 xfs_inactive_symlink_rmt(ip, &tp) :
1244 xfs_inactive_symlink_local(ip, &tp);
1246 if (error) {
1247 ASSERT(tp == NULL);
1248 return VN_INACTIVE_CACHE;
1251 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1252 xfs_trans_ihold(tp, ip);
1253 } else {
1254 error = xfs_trans_reserve(tp, 0,
1255 XFS_IFREE_LOG_RES(mp),
1256 0, XFS_TRANS_PERM_LOG_RES,
1257 XFS_INACTIVE_LOG_COUNT);
1258 if (error) {
1259 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1260 xfs_trans_cancel(tp, 0);
1261 return VN_INACTIVE_CACHE;
1264 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1265 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1266 xfs_trans_ihold(tp, ip);
1270 * If there are attributes associated with the file
1271 * then blow them away now. The code calls a routine
1272 * that recursively deconstructs the attribute fork.
1273 * We need to just commit the current transaction
1274 * because we can't use it for xfs_attr_inactive().
1276 if (ip->i_d.di_anextents > 0) {
1277 error = xfs_inactive_attrs(ip, &tp);
1279 * If we got an error, the transaction is already
1280 * cancelled, and the inode is unlocked. Just get out.
1282 if (error)
1283 return VN_INACTIVE_CACHE;
1284 } else if (ip->i_afp) {
1285 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1289 * Free the inode.
1291 xfs_bmap_init(&free_list, &first_block);
1292 error = xfs_ifree(tp, ip, &free_list);
1293 if (error) {
1295 * If we fail to free the inode, shut down. The cancel
1296 * might do that, we need to make sure. Otherwise the
1297 * inode might be lost for a long time or forever.
1299 if (!XFS_FORCED_SHUTDOWN(mp)) {
1300 cmn_err(CE_NOTE,
1301 "xfs_inactive: xfs_ifree() returned an error = %d on %s",
1302 error, mp->m_fsname);
1303 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1305 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
1306 } else {
1308 * Credit the quota account(s). The inode is gone.
1310 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1313 * Just ignore errors at this point. There is nothing we can
1314 * do except to try to keep going. Make sure it's not a silent
1315 * error.
1317 error = xfs_bmap_finish(&tp, &free_list, &committed);
1318 if (error)
1319 xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: "
1320 "xfs_bmap_finish() returned error %d", error);
1321 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1322 if (error)
1323 xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: "
1324 "xfs_trans_commit() returned error %d", error);
1327 * Release the dquots held by inode, if any.
1329 XFS_QM_DQDETACH(mp, ip);
1331 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1333 out:
1334 return VN_INACTIVE_CACHE;
1338 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
1339 * is allowed, otherwise it has to be an exact match. If a CI match is found,
1340 * ci_name->name will point to a the actual name (caller must free) or
1341 * will be set to NULL if an exact match is found.
1344 xfs_lookup(
1345 xfs_inode_t *dp,
1346 struct xfs_name *name,
1347 xfs_inode_t **ipp,
1348 struct xfs_name *ci_name)
1350 xfs_ino_t inum;
1351 int error;
1352 uint lock_mode;
1354 xfs_itrace_entry(dp);
1356 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
1357 return XFS_ERROR(EIO);
1359 lock_mode = xfs_ilock_map_shared(dp);
1360 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
1361 xfs_iunlock_map_shared(dp, lock_mode);
1363 if (error)
1364 goto out;
1366 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp, 0);
1367 if (error)
1368 goto out_free_name;
1370 xfs_itrace_ref(*ipp);
1371 return 0;
1373 out_free_name:
1374 if (ci_name)
1375 kmem_free(ci_name->name);
1376 out:
1377 *ipp = NULL;
1378 return error;
1382 xfs_create(
1383 xfs_inode_t *dp,
1384 struct xfs_name *name,
1385 mode_t mode,
1386 xfs_dev_t rdev,
1387 xfs_inode_t **ipp,
1388 cred_t *credp)
1390 xfs_mount_t *mp = dp->i_mount;
1391 xfs_inode_t *ip;
1392 xfs_trans_t *tp;
1393 int error;
1394 xfs_bmap_free_t free_list;
1395 xfs_fsblock_t first_block;
1396 boolean_t unlock_dp_on_error = B_FALSE;
1397 int dm_event_sent = 0;
1398 uint cancel_flags;
1399 int committed;
1400 xfs_prid_t prid;
1401 struct xfs_dquot *udqp, *gdqp;
1402 uint resblks;
1404 ASSERT(!*ipp);
1405 xfs_itrace_entry(dp);
1407 if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) {
1408 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
1409 dp, DM_RIGHT_NULL, NULL,
1410 DM_RIGHT_NULL, name->name, NULL,
1411 mode, 0, 0);
1413 if (error)
1414 return error;
1415 dm_event_sent = 1;
1418 if (XFS_FORCED_SHUTDOWN(mp))
1419 return XFS_ERROR(EIO);
1421 /* Return through std_return after this point. */
1423 udqp = gdqp = NULL;
1424 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1425 prid = dp->i_d.di_projid;
1426 else
1427 prid = (xfs_prid_t)dfltprid;
1430 * Make sure that we have allocated dquot(s) on disk.
1432 error = XFS_QM_DQVOPALLOC(mp, dp,
1433 current_fsuid(), current_fsgid(), prid,
1434 XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp);
1435 if (error)
1436 goto std_return;
1438 ip = NULL;
1440 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
1441 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1442 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
1444 * Initially assume that the file does not exist and
1445 * reserve the resources for that case. If that is not
1446 * the case we'll drop the one we have and get a more
1447 * appropriate transaction later.
1449 error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0,
1450 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1451 if (error == ENOSPC) {
1452 resblks = 0;
1453 error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0,
1454 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1456 if (error) {
1457 cancel_flags = 0;
1458 goto error_return;
1461 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1462 unlock_dp_on_error = B_TRUE;
1464 xfs_bmap_init(&free_list, &first_block);
1466 ASSERT(ip == NULL);
1469 * Reserve disk quota and the inode.
1471 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
1472 if (error)
1473 goto error_return;
1475 error = xfs_dir_canenter(tp, dp, name, resblks);
1476 if (error)
1477 goto error_return;
1478 error = xfs_dir_ialloc(&tp, dp, mode, 1,
1479 rdev, credp, prid, resblks > 0,
1480 &ip, &committed);
1481 if (error) {
1482 if (error == ENOSPC)
1483 goto error_return;
1484 goto abort_return;
1486 xfs_itrace_ref(ip);
1489 * At this point, we've gotten a newly allocated inode.
1490 * It is locked (and joined to the transaction).
1493 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1496 * Now we join the directory inode to the transaction. We do not do it
1497 * earlier because xfs_dir_ialloc might commit the previous transaction
1498 * (and release all the locks). An error from here on will result in
1499 * the transaction cancel unlocking dp so don't do it explicitly in the
1500 * error path.
1502 IHOLD(dp);
1503 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1504 unlock_dp_on_error = B_FALSE;
1506 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
1507 &first_block, &free_list, resblks ?
1508 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
1509 if (error) {
1510 ASSERT(error != ENOSPC);
1511 goto abort_return;
1513 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1514 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1517 * If this is a synchronous mount, make sure that the
1518 * create transaction goes to disk before returning to
1519 * the user.
1521 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1522 xfs_trans_set_sync(tp);
1526 * Attach the dquot(s) to the inodes and modify them incore.
1527 * These ids of the inode couldn't have changed since the new
1528 * inode has been locked ever since it was created.
1530 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
1533 * xfs_trans_commit normally decrements the vnode ref count
1534 * when it unlocks the inode. Since we want to return the
1535 * vnode to the caller, we bump the vnode ref count now.
1537 IHOLD(ip);
1539 error = xfs_bmap_finish(&tp, &free_list, &committed);
1540 if (error) {
1541 xfs_bmap_cancel(&free_list);
1542 goto abort_rele;
1545 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1546 if (error) {
1547 IRELE(ip);
1548 tp = NULL;
1549 goto error_return;
1552 XFS_QM_DQRELE(mp, udqp);
1553 XFS_QM_DQRELE(mp, gdqp);
1555 *ipp = ip;
1557 /* Fallthrough to std_return with error = 0 */
1559 std_return:
1560 if ((*ipp || (error != 0 && dm_event_sent != 0)) &&
1561 DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) {
1562 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
1563 dp, DM_RIGHT_NULL,
1564 *ipp ? ip : NULL,
1565 DM_RIGHT_NULL, name->name, NULL,
1566 mode, error, 0);
1568 return error;
1570 abort_return:
1571 cancel_flags |= XFS_TRANS_ABORT;
1572 /* FALLTHROUGH */
1574 error_return:
1575 if (tp != NULL)
1576 xfs_trans_cancel(tp, cancel_flags);
1578 XFS_QM_DQRELE(mp, udqp);
1579 XFS_QM_DQRELE(mp, gdqp);
1581 if (unlock_dp_on_error)
1582 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1584 goto std_return;
1586 abort_rele:
1588 * Wait until after the current transaction is aborted to
1589 * release the inode. This prevents recursive transactions
1590 * and deadlocks from xfs_inactive.
1592 cancel_flags |= XFS_TRANS_ABORT;
1593 xfs_trans_cancel(tp, cancel_flags);
1594 IRELE(ip);
1596 XFS_QM_DQRELE(mp, udqp);
1597 XFS_QM_DQRELE(mp, gdqp);
1599 goto std_return;
1602 #ifdef DEBUG
1603 int xfs_locked_n;
1604 int xfs_small_retries;
1605 int xfs_middle_retries;
1606 int xfs_lots_retries;
1607 int xfs_lock_delays;
1608 #endif
1611 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1612 * a different value
1614 static inline int
1615 xfs_lock_inumorder(int lock_mode, int subclass)
1617 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1618 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
1619 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
1620 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
1622 return lock_mode;
1626 * The following routine will lock n inodes in exclusive mode.
1627 * We assume the caller calls us with the inodes in i_ino order.
1629 * We need to detect deadlock where an inode that we lock
1630 * is in the AIL and we start waiting for another inode that is locked
1631 * by a thread in a long running transaction (such as truncate). This can
1632 * result in deadlock since the long running trans might need to wait
1633 * for the inode we just locked in order to push the tail and free space
1634 * in the log.
1636 void
1637 xfs_lock_inodes(
1638 xfs_inode_t **ips,
1639 int inodes,
1640 uint lock_mode)
1642 int attempts = 0, i, j, try_lock;
1643 xfs_log_item_t *lp;
1645 ASSERT(ips && (inodes >= 2)); /* we need at least two */
1647 try_lock = 0;
1648 i = 0;
1650 again:
1651 for (; i < inodes; i++) {
1652 ASSERT(ips[i]);
1654 if (i && (ips[i] == ips[i-1])) /* Already locked */
1655 continue;
1658 * If try_lock is not set yet, make sure all locked inodes
1659 * are not in the AIL.
1660 * If any are, set try_lock to be used later.
1663 if (!try_lock) {
1664 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1665 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1666 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1667 try_lock++;
1673 * If any of the previous locks we have locked is in the AIL,
1674 * we must TRY to get the second and subsequent locks. If
1675 * we can't get any, we must release all we have
1676 * and try again.
1679 if (try_lock) {
1680 /* try_lock must be 0 if i is 0. */
1682 * try_lock means we have an inode locked
1683 * that is in the AIL.
1685 ASSERT(i != 0);
1686 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
1687 attempts++;
1690 * Unlock all previous guys and try again.
1691 * xfs_iunlock will try to push the tail
1692 * if the inode is in the AIL.
1695 for(j = i - 1; j >= 0; j--) {
1698 * Check to see if we've already
1699 * unlocked this one.
1700 * Not the first one going back,
1701 * and the inode ptr is the same.
1703 if ((j != (i - 1)) && ips[j] ==
1704 ips[j+1])
1705 continue;
1707 xfs_iunlock(ips[j], lock_mode);
1710 if ((attempts % 5) == 0) {
1711 delay(1); /* Don't just spin the CPU */
1712 #ifdef DEBUG
1713 xfs_lock_delays++;
1714 #endif
1716 i = 0;
1717 try_lock = 0;
1718 goto again;
1720 } else {
1721 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
1725 #ifdef DEBUG
1726 if (attempts) {
1727 if (attempts < 5) xfs_small_retries++;
1728 else if (attempts < 100) xfs_middle_retries++;
1729 else xfs_lots_retries++;
1730 } else {
1731 xfs_locked_n++;
1733 #endif
1737 * xfs_lock_two_inodes() can only be used to lock one type of lock
1738 * at a time - the iolock or the ilock, but not both at once. If
1739 * we lock both at once, lockdep will report false positives saying
1740 * we have violated locking orders.
1742 void
1743 xfs_lock_two_inodes(
1744 xfs_inode_t *ip0,
1745 xfs_inode_t *ip1,
1746 uint lock_mode)
1748 xfs_inode_t *temp;
1749 int attempts = 0;
1750 xfs_log_item_t *lp;
1752 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1753 ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0);
1754 ASSERT(ip0->i_ino != ip1->i_ino);
1756 if (ip0->i_ino > ip1->i_ino) {
1757 temp = ip0;
1758 ip0 = ip1;
1759 ip1 = temp;
1762 again:
1763 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1766 * If the first lock we have locked is in the AIL, we must TRY to get
1767 * the second lock. If we can't get it, we must release the first one
1768 * and try again.
1770 lp = (xfs_log_item_t *)ip0->i_itemp;
1771 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1772 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1773 xfs_iunlock(ip0, lock_mode);
1774 if ((++attempts % 5) == 0)
1775 delay(1); /* Don't just spin the CPU */
1776 goto again;
1778 } else {
1779 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1784 xfs_remove(
1785 xfs_inode_t *dp,
1786 struct xfs_name *name,
1787 xfs_inode_t *ip)
1789 xfs_mount_t *mp = dp->i_mount;
1790 xfs_trans_t *tp = NULL;
1791 int is_dir = S_ISDIR(ip->i_d.di_mode);
1792 int error = 0;
1793 xfs_bmap_free_t free_list;
1794 xfs_fsblock_t first_block;
1795 int cancel_flags;
1796 int committed;
1797 int link_zero;
1798 uint resblks;
1799 uint log_count;
1801 xfs_itrace_entry(dp);
1802 xfs_itrace_entry(ip);
1804 if (XFS_FORCED_SHUTDOWN(mp))
1805 return XFS_ERROR(EIO);
1807 if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) {
1808 error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dp, DM_RIGHT_NULL,
1809 NULL, DM_RIGHT_NULL, name->name, NULL,
1810 ip->i_d.di_mode, 0, 0);
1811 if (error)
1812 return error;
1815 error = XFS_QM_DQATTACH(mp, dp, 0);
1816 if (error)
1817 goto std_return;
1819 error = XFS_QM_DQATTACH(mp, ip, 0);
1820 if (error)
1821 goto std_return;
1823 if (is_dir) {
1824 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1825 log_count = XFS_DEFAULT_LOG_COUNT;
1826 } else {
1827 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1828 log_count = XFS_REMOVE_LOG_COUNT;
1830 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1833 * We try to get the real space reservation first,
1834 * allowing for directory btree deletion(s) implying
1835 * possible bmap insert(s). If we can't get the space
1836 * reservation then we use 0 instead, and avoid the bmap
1837 * btree insert(s) in the directory code by, if the bmap
1838 * insert tries to happen, instead trimming the LAST
1839 * block from the directory.
1841 resblks = XFS_REMOVE_SPACE_RES(mp);
1842 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
1843 XFS_TRANS_PERM_LOG_RES, log_count);
1844 if (error == ENOSPC) {
1845 resblks = 0;
1846 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
1847 XFS_TRANS_PERM_LOG_RES, log_count);
1849 if (error) {
1850 ASSERT(error != ENOSPC);
1851 cancel_flags = 0;
1852 goto out_trans_cancel;
1855 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
1858 * At this point, we've gotten both the directory and the entry
1859 * inodes locked.
1861 IHOLD(ip);
1862 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1864 IHOLD(dp);
1865 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1868 * If we're removing a directory perform some additional validation.
1870 if (is_dir) {
1871 ASSERT(ip->i_d.di_nlink >= 2);
1872 if (ip->i_d.di_nlink != 2) {
1873 error = XFS_ERROR(ENOTEMPTY);
1874 goto out_trans_cancel;
1876 if (!xfs_dir_isempty(ip)) {
1877 error = XFS_ERROR(ENOTEMPTY);
1878 goto out_trans_cancel;
1882 xfs_bmap_init(&free_list, &first_block);
1883 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
1884 &first_block, &free_list, resblks);
1885 if (error) {
1886 ASSERT(error != ENOENT);
1887 goto out_bmap_cancel;
1889 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1891 if (is_dir) {
1893 * Drop the link from ip's "..".
1895 error = xfs_droplink(tp, dp);
1896 if (error)
1897 goto out_bmap_cancel;
1900 * Drop the "." link from ip to self.
1902 error = xfs_droplink(tp, ip);
1903 if (error)
1904 goto out_bmap_cancel;
1905 } else {
1907 * When removing a non-directory we need to log the parent
1908 * inode here. For a directory this is done implicitly
1909 * by the xfs_droplink call for the ".." entry.
1911 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1915 * Drop the link from dp to ip.
1917 error = xfs_droplink(tp, ip);
1918 if (error)
1919 goto out_bmap_cancel;
1922 * Determine if this is the last link while
1923 * we are in the transaction.
1925 link_zero = (ip->i_d.di_nlink == 0);
1928 * If this is a synchronous mount, make sure that the
1929 * remove transaction goes to disk before returning to
1930 * the user.
1932 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
1933 xfs_trans_set_sync(tp);
1935 error = xfs_bmap_finish(&tp, &free_list, &committed);
1936 if (error)
1937 goto out_bmap_cancel;
1939 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1940 if (error)
1941 goto std_return;
1944 * If we are using filestreams, kill the stream association.
1945 * If the file is still open it may get a new one but that
1946 * will get killed on last close in xfs_close() so we don't
1947 * have to worry about that.
1949 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
1950 xfs_filestream_deassociate(ip);
1952 xfs_itrace_exit(ip);
1953 xfs_itrace_exit(dp);
1955 std_return:
1956 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) {
1957 XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, dp, DM_RIGHT_NULL,
1958 NULL, DM_RIGHT_NULL, name->name, NULL,
1959 ip->i_d.di_mode, error, 0);
1962 return error;
1964 out_bmap_cancel:
1965 xfs_bmap_cancel(&free_list);
1966 cancel_flags |= XFS_TRANS_ABORT;
1967 out_trans_cancel:
1968 xfs_trans_cancel(tp, cancel_flags);
1969 goto std_return;
1973 xfs_link(
1974 xfs_inode_t *tdp,
1975 xfs_inode_t *sip,
1976 struct xfs_name *target_name)
1978 xfs_mount_t *mp = tdp->i_mount;
1979 xfs_trans_t *tp;
1980 int error;
1981 xfs_bmap_free_t free_list;
1982 xfs_fsblock_t first_block;
1983 int cancel_flags;
1984 int committed;
1985 int resblks;
1987 xfs_itrace_entry(tdp);
1988 xfs_itrace_entry(sip);
1990 ASSERT(!S_ISDIR(sip->i_d.di_mode));
1992 if (XFS_FORCED_SHUTDOWN(mp))
1993 return XFS_ERROR(EIO);
1995 if (DM_EVENT_ENABLED(tdp, DM_EVENT_LINK)) {
1996 error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK,
1997 tdp, DM_RIGHT_NULL,
1998 sip, DM_RIGHT_NULL,
1999 target_name->name, NULL, 0, 0, 0);
2000 if (error)
2001 return error;
2004 /* Return through std_return after this point. */
2006 error = XFS_QM_DQATTACH(mp, sip, 0);
2007 if (!error && sip != tdp)
2008 error = XFS_QM_DQATTACH(mp, tdp, 0);
2009 if (error)
2010 goto std_return;
2012 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
2013 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2014 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
2015 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
2016 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2017 if (error == ENOSPC) {
2018 resblks = 0;
2019 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
2020 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2022 if (error) {
2023 cancel_flags = 0;
2024 goto error_return;
2027 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
2030 * Increment vnode ref counts since xfs_trans_commit &
2031 * xfs_trans_cancel will both unlock the inodes and
2032 * decrement the associated ref counts.
2034 IHOLD(sip);
2035 IHOLD(tdp);
2036 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
2037 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
2040 * If the source has too many links, we can't make any more to it.
2042 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
2043 error = XFS_ERROR(EMLINK);
2044 goto error_return;
2048 * If we are using project inheritance, we only allow hard link
2049 * creation in our tree when the project IDs are the same; else
2050 * the tree quota mechanism could be circumvented.
2052 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
2053 (tdp->i_d.di_projid != sip->i_d.di_projid))) {
2054 error = XFS_ERROR(EXDEV);
2055 goto error_return;
2058 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
2059 if (error)
2060 goto error_return;
2062 xfs_bmap_init(&free_list, &first_block);
2064 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
2065 &first_block, &free_list, resblks);
2066 if (error)
2067 goto abort_return;
2068 xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2069 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
2071 error = xfs_bumplink(tp, sip);
2072 if (error)
2073 goto abort_return;
2076 * If this is a synchronous mount, make sure that the
2077 * link transaction goes to disk before returning to
2078 * the user.
2080 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2081 xfs_trans_set_sync(tp);
2084 error = xfs_bmap_finish (&tp, &free_list, &committed);
2085 if (error) {
2086 xfs_bmap_cancel(&free_list);
2087 goto abort_return;
2090 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2091 if (error)
2092 goto std_return;
2094 /* Fall through to std_return with error = 0. */
2095 std_return:
2096 if (DM_EVENT_ENABLED(sip, DM_EVENT_POSTLINK)) {
2097 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK,
2098 tdp, DM_RIGHT_NULL,
2099 sip, DM_RIGHT_NULL,
2100 target_name->name, NULL, 0, error, 0);
2102 return error;
2104 abort_return:
2105 cancel_flags |= XFS_TRANS_ABORT;
2106 /* FALLTHROUGH */
2108 error_return:
2109 xfs_trans_cancel(tp, cancel_flags);
2110 goto std_return;
2115 xfs_mkdir(
2116 xfs_inode_t *dp,
2117 struct xfs_name *dir_name,
2118 mode_t mode,
2119 xfs_inode_t **ipp,
2120 cred_t *credp)
2122 xfs_mount_t *mp = dp->i_mount;
2123 xfs_inode_t *cdp; /* inode of created dir */
2124 xfs_trans_t *tp;
2125 int cancel_flags;
2126 int error;
2127 int committed;
2128 xfs_bmap_free_t free_list;
2129 xfs_fsblock_t first_block;
2130 boolean_t unlock_dp_on_error = B_FALSE;
2131 boolean_t created = B_FALSE;
2132 int dm_event_sent = 0;
2133 xfs_prid_t prid;
2134 struct xfs_dquot *udqp, *gdqp;
2135 uint resblks;
2137 if (XFS_FORCED_SHUTDOWN(mp))
2138 return XFS_ERROR(EIO);
2140 tp = NULL;
2142 if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) {
2143 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
2144 dp, DM_RIGHT_NULL, NULL,
2145 DM_RIGHT_NULL, dir_name->name, NULL,
2146 mode, 0, 0);
2147 if (error)
2148 return error;
2149 dm_event_sent = 1;
2152 /* Return through std_return after this point. */
2154 xfs_itrace_entry(dp);
2156 mp = dp->i_mount;
2157 udqp = gdqp = NULL;
2158 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
2159 prid = dp->i_d.di_projid;
2160 else
2161 prid = (xfs_prid_t)dfltprid;
2164 * Make sure that we have allocated dquot(s) on disk.
2166 error = XFS_QM_DQVOPALLOC(mp, dp,
2167 current_fsuid(), current_fsgid(), prid,
2168 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
2169 if (error)
2170 goto std_return;
2172 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
2173 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2174 resblks = XFS_MKDIR_SPACE_RES(mp, dir_name->len);
2175 error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0,
2176 XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT);
2177 if (error == ENOSPC) {
2178 resblks = 0;
2179 error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0,
2180 XFS_TRANS_PERM_LOG_RES,
2181 XFS_MKDIR_LOG_COUNT);
2183 if (error) {
2184 cancel_flags = 0;
2185 goto error_return;
2188 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
2189 unlock_dp_on_error = B_TRUE;
2192 * Check for directory link count overflow.
2194 if (dp->i_d.di_nlink >= XFS_MAXLINK) {
2195 error = XFS_ERROR(EMLINK);
2196 goto error_return;
2200 * Reserve disk quota and the inode.
2202 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
2203 if (error)
2204 goto error_return;
2206 error = xfs_dir_canenter(tp, dp, dir_name, resblks);
2207 if (error)
2208 goto error_return;
2210 * create the directory inode.
2212 error = xfs_dir_ialloc(&tp, dp, mode, 2,
2213 0, credp, prid, resblks > 0,
2214 &cdp, NULL);
2215 if (error) {
2216 if (error == ENOSPC)
2217 goto error_return;
2218 goto abort_return;
2220 xfs_itrace_ref(cdp);
2223 * Now we add the directory inode to the transaction.
2224 * We waited until now since xfs_dir_ialloc might start
2225 * a new transaction. Had we joined the transaction
2226 * earlier, the locks might have gotten released. An error
2227 * from here on will result in the transaction cancel
2228 * unlocking dp so don't do it explicitly in the error path.
2230 IHOLD(dp);
2231 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2232 unlock_dp_on_error = B_FALSE;
2234 xfs_bmap_init(&free_list, &first_block);
2236 error = xfs_dir_createname(tp, dp, dir_name, cdp->i_ino,
2237 &first_block, &free_list, resblks ?
2238 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
2239 if (error) {
2240 ASSERT(error != ENOSPC);
2241 goto error1;
2243 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2245 error = xfs_dir_init(tp, cdp, dp);
2246 if (error)
2247 goto error2;
2249 error = xfs_bumplink(tp, dp);
2250 if (error)
2251 goto error2;
2253 created = B_TRUE;
2255 *ipp = cdp;
2256 IHOLD(cdp);
2259 * Attach the dquots to the new inode and modify the icount incore.
2261 XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp);
2264 * If this is a synchronous mount, make sure that the
2265 * mkdir transaction goes to disk before returning to
2266 * the user.
2268 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2269 xfs_trans_set_sync(tp);
2272 error = xfs_bmap_finish(&tp, &free_list, &committed);
2273 if (error) {
2274 IRELE(cdp);
2275 goto error2;
2278 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2279 XFS_QM_DQRELE(mp, udqp);
2280 XFS_QM_DQRELE(mp, gdqp);
2281 if (error) {
2282 IRELE(cdp);
2285 /* Fall through to std_return with error = 0 or errno from
2286 * xfs_trans_commit. */
2288 std_return:
2289 if ((created || (error != 0 && dm_event_sent != 0)) &&
2290 DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) {
2291 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
2292 dp, DM_RIGHT_NULL,
2293 created ? cdp : NULL,
2294 DM_RIGHT_NULL,
2295 dir_name->name, NULL,
2296 mode, error, 0);
2298 return error;
2300 error2:
2301 error1:
2302 xfs_bmap_cancel(&free_list);
2303 abort_return:
2304 cancel_flags |= XFS_TRANS_ABORT;
2305 error_return:
2306 xfs_trans_cancel(tp, cancel_flags);
2307 XFS_QM_DQRELE(mp, udqp);
2308 XFS_QM_DQRELE(mp, gdqp);
2310 if (unlock_dp_on_error)
2311 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2313 goto std_return;
2317 xfs_symlink(
2318 xfs_inode_t *dp,
2319 struct xfs_name *link_name,
2320 const char *target_path,
2321 mode_t mode,
2322 xfs_inode_t **ipp,
2323 cred_t *credp)
2325 xfs_mount_t *mp = dp->i_mount;
2326 xfs_trans_t *tp;
2327 xfs_inode_t *ip;
2328 int error;
2329 int pathlen;
2330 xfs_bmap_free_t free_list;
2331 xfs_fsblock_t first_block;
2332 boolean_t unlock_dp_on_error = B_FALSE;
2333 uint cancel_flags;
2334 int committed;
2335 xfs_fileoff_t first_fsb;
2336 xfs_filblks_t fs_blocks;
2337 int nmaps;
2338 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
2339 xfs_daddr_t d;
2340 const char *cur_chunk;
2341 int byte_cnt;
2342 int n;
2343 xfs_buf_t *bp;
2344 xfs_prid_t prid;
2345 struct xfs_dquot *udqp, *gdqp;
2346 uint resblks;
2348 *ipp = NULL;
2349 error = 0;
2350 ip = NULL;
2351 tp = NULL;
2353 xfs_itrace_entry(dp);
2355 if (XFS_FORCED_SHUTDOWN(mp))
2356 return XFS_ERROR(EIO);
2359 * Check component lengths of the target path name.
2361 pathlen = strlen(target_path);
2362 if (pathlen >= MAXPATHLEN) /* total string too long */
2363 return XFS_ERROR(ENAMETOOLONG);
2365 if (DM_EVENT_ENABLED(dp, DM_EVENT_SYMLINK)) {
2366 error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dp,
2367 DM_RIGHT_NULL, NULL, DM_RIGHT_NULL,
2368 link_name->name, target_path, 0, 0, 0);
2369 if (error)
2370 return error;
2373 /* Return through std_return after this point. */
2375 udqp = gdqp = NULL;
2376 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
2377 prid = dp->i_d.di_projid;
2378 else
2379 prid = (xfs_prid_t)dfltprid;
2382 * Make sure that we have allocated dquot(s) on disk.
2384 error = XFS_QM_DQVOPALLOC(mp, dp,
2385 current_fsuid(), current_fsgid(), prid,
2386 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
2387 if (error)
2388 goto std_return;
2390 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
2391 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2393 * The symlink will fit into the inode data fork?
2394 * There can't be any attributes so we get the whole variable part.
2396 if (pathlen <= XFS_LITINO(mp))
2397 fs_blocks = 0;
2398 else
2399 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
2400 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
2401 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
2402 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
2403 if (error == ENOSPC && fs_blocks == 0) {
2404 resblks = 0;
2405 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
2406 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
2408 if (error) {
2409 cancel_flags = 0;
2410 goto error_return;
2413 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
2414 unlock_dp_on_error = B_TRUE;
2417 * Check whether the directory allows new symlinks or not.
2419 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
2420 error = XFS_ERROR(EPERM);
2421 goto error_return;
2425 * Reserve disk quota : blocks and inode.
2427 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
2428 if (error)
2429 goto error_return;
2432 * Check for ability to enter directory entry, if no space reserved.
2434 error = xfs_dir_canenter(tp, dp, link_name, resblks);
2435 if (error)
2436 goto error_return;
2438 * Initialize the bmap freelist prior to calling either
2439 * bmapi or the directory create code.
2441 xfs_bmap_init(&free_list, &first_block);
2444 * Allocate an inode for the symlink.
2446 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT),
2447 1, 0, credp, prid, resblks > 0, &ip, NULL);
2448 if (error) {
2449 if (error == ENOSPC)
2450 goto error_return;
2451 goto error1;
2453 xfs_itrace_ref(ip);
2456 * An error after we've joined dp to the transaction will result in the
2457 * transaction cancel unlocking dp so don't do it explicitly in the
2458 * error path.
2460 IHOLD(dp);
2461 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2462 unlock_dp_on_error = B_FALSE;
2465 * Also attach the dquot(s) to it, if applicable.
2467 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
2469 if (resblks)
2470 resblks -= XFS_IALLOC_SPACE_RES(mp);
2472 * If the symlink will fit into the inode, write it inline.
2474 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
2475 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
2476 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
2477 ip->i_d.di_size = pathlen;
2480 * The inode was initially created in extent format.
2482 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
2483 ip->i_df.if_flags |= XFS_IFINLINE;
2485 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
2486 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
2488 } else {
2489 first_fsb = 0;
2490 nmaps = SYMLINK_MAPS;
2492 error = xfs_bmapi(tp, ip, first_fsb, fs_blocks,
2493 XFS_BMAPI_WRITE | XFS_BMAPI_METADATA,
2494 &first_block, resblks, mval, &nmaps,
2495 &free_list, NULL);
2496 if (error) {
2497 goto error1;
2500 if (resblks)
2501 resblks -= fs_blocks;
2502 ip->i_d.di_size = pathlen;
2503 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2505 cur_chunk = target_path;
2506 for (n = 0; n < nmaps; n++) {
2507 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
2508 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
2509 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
2510 BTOBB(byte_cnt), 0);
2511 ASSERT(bp && !XFS_BUF_GETERROR(bp));
2512 if (pathlen < byte_cnt) {
2513 byte_cnt = pathlen;
2515 pathlen -= byte_cnt;
2517 memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt);
2518 cur_chunk += byte_cnt;
2520 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
2525 * Create the directory entry for the symlink.
2527 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
2528 &first_block, &free_list, resblks);
2529 if (error)
2530 goto error1;
2531 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2532 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2535 * If this is a synchronous mount, make sure that the
2536 * symlink transaction goes to disk before returning to
2537 * the user.
2539 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2540 xfs_trans_set_sync(tp);
2544 * xfs_trans_commit normally decrements the vnode ref count
2545 * when it unlocks the inode. Since we want to return the
2546 * vnode to the caller, we bump the vnode ref count now.
2548 IHOLD(ip);
2550 error = xfs_bmap_finish(&tp, &free_list, &committed);
2551 if (error) {
2552 goto error2;
2554 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2555 XFS_QM_DQRELE(mp, udqp);
2556 XFS_QM_DQRELE(mp, gdqp);
2558 /* Fall through to std_return with error = 0 or errno from
2559 * xfs_trans_commit */
2560 std_return:
2561 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTSYMLINK)) {
2562 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK,
2563 dp, DM_RIGHT_NULL,
2564 error ? NULL : ip,
2565 DM_RIGHT_NULL, link_name->name,
2566 target_path, 0, error, 0);
2569 if (!error)
2570 *ipp = ip;
2571 return error;
2573 error2:
2574 IRELE(ip);
2575 error1:
2576 xfs_bmap_cancel(&free_list);
2577 cancel_flags |= XFS_TRANS_ABORT;
2578 error_return:
2579 xfs_trans_cancel(tp, cancel_flags);
2580 XFS_QM_DQRELE(mp, udqp);
2581 XFS_QM_DQRELE(mp, gdqp);
2583 if (unlock_dp_on_error)
2584 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2586 goto std_return;
2590 xfs_inode_flush(
2591 xfs_inode_t *ip,
2592 int flags)
2594 xfs_mount_t *mp = ip->i_mount;
2595 int error = 0;
2597 if (XFS_FORCED_SHUTDOWN(mp))
2598 return XFS_ERROR(EIO);
2601 * Bypass inodes which have already been cleaned by
2602 * the inode flush clustering code inside xfs_iflush
2604 if (xfs_inode_clean(ip))
2605 return 0;
2608 * We make this non-blocking if the inode is contended,
2609 * return EAGAIN to indicate to the caller that they
2610 * did not succeed. This prevents the flush path from
2611 * blocking on inodes inside another operation right
2612 * now, they get caught later by xfs_sync.
2614 if (flags & FLUSH_SYNC) {
2615 xfs_ilock(ip, XFS_ILOCK_SHARED);
2616 xfs_iflock(ip);
2617 } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
2618 if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) {
2619 xfs_iunlock(ip, XFS_ILOCK_SHARED);
2620 return EAGAIN;
2622 } else {
2623 return EAGAIN;
2626 error = xfs_iflush(ip, (flags & FLUSH_SYNC) ? XFS_IFLUSH_SYNC
2627 : XFS_IFLUSH_ASYNC_NOBLOCK);
2628 xfs_iunlock(ip, XFS_ILOCK_SHARED);
2630 return error;
2635 xfs_set_dmattrs(
2636 xfs_inode_t *ip,
2637 u_int evmask,
2638 u_int16_t state)
2640 xfs_mount_t *mp = ip->i_mount;
2641 xfs_trans_t *tp;
2642 int error;
2644 if (!capable(CAP_SYS_ADMIN))
2645 return XFS_ERROR(EPERM);
2647 if (XFS_FORCED_SHUTDOWN(mp))
2648 return XFS_ERROR(EIO);
2650 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
2651 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
2652 if (error) {
2653 xfs_trans_cancel(tp, 0);
2654 return error;
2656 xfs_ilock(ip, XFS_ILOCK_EXCL);
2657 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2659 ip->i_d.di_dmevmask = evmask;
2660 ip->i_d.di_dmstate = state;
2662 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2663 IHOLD(ip);
2664 error = xfs_trans_commit(tp, 0);
2666 return error;
2670 xfs_reclaim(
2671 xfs_inode_t *ip)
2674 xfs_itrace_entry(ip);
2676 ASSERT(!VN_MAPPED(VFS_I(ip)));
2678 /* bad inode, get out here ASAP */
2679 if (VN_BAD(VFS_I(ip))) {
2680 xfs_ireclaim(ip);
2681 return 0;
2684 xfs_ioend_wait(ip);
2686 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
2689 * Make sure the atime in the XFS inode is correct before freeing the
2690 * Linux inode.
2692 xfs_synchronize_atime(ip);
2695 * If we have nothing to flush with this inode then complete the
2696 * teardown now, otherwise break the link between the xfs inode and the
2697 * linux inode and clean up the xfs inode later. This avoids flushing
2698 * the inode to disk during the delete operation itself.
2700 * When breaking the link, we need to set the XFS_IRECLAIMABLE flag
2701 * first to ensure that xfs_iunpin() will never see an xfs inode
2702 * that has a linux inode being reclaimed. Synchronisation is provided
2703 * by the i_flags_lock.
2705 if (!ip->i_update_core && (ip->i_itemp == NULL)) {
2706 xfs_ilock(ip, XFS_ILOCK_EXCL);
2707 xfs_iflock(ip);
2708 xfs_iflags_set(ip, XFS_IRECLAIMABLE);
2709 return xfs_reclaim_inode(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC);
2711 xfs_inode_set_reclaim_tag(ip);
2712 return 0;
2716 * xfs_alloc_file_space()
2717 * This routine allocates disk space for the given file.
2719 * If alloc_type == 0, this request is for an ALLOCSP type
2720 * request which will change the file size. In this case, no
2721 * DMAPI event will be generated by the call. A TRUNCATE event
2722 * will be generated later by xfs_setattr.
2724 * If alloc_type != 0, this request is for a RESVSP type
2725 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
2726 * lower block boundary byte address is less than the file's
2727 * length.
2729 * RETURNS:
2730 * 0 on success
2731 * errno on error
2734 STATIC int
2735 xfs_alloc_file_space(
2736 xfs_inode_t *ip,
2737 xfs_off_t offset,
2738 xfs_off_t len,
2739 int alloc_type,
2740 int attr_flags)
2742 xfs_mount_t *mp = ip->i_mount;
2743 xfs_off_t count;
2744 xfs_filblks_t allocated_fsb;
2745 xfs_filblks_t allocatesize_fsb;
2746 xfs_extlen_t extsz, temp;
2747 xfs_fileoff_t startoffset_fsb;
2748 xfs_fsblock_t firstfsb;
2749 int nimaps;
2750 int bmapi_flag;
2751 int quota_flag;
2752 int rt;
2753 xfs_trans_t *tp;
2754 xfs_bmbt_irec_t imaps[1], *imapp;
2755 xfs_bmap_free_t free_list;
2756 uint qblocks, resblks, resrtextents;
2757 int committed;
2758 int error;
2760 xfs_itrace_entry(ip);
2762 if (XFS_FORCED_SHUTDOWN(mp))
2763 return XFS_ERROR(EIO);
2765 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
2766 return error;
2768 if (len <= 0)
2769 return XFS_ERROR(EINVAL);
2771 rt = XFS_IS_REALTIME_INODE(ip);
2772 extsz = xfs_get_extsz_hint(ip);
2774 count = len;
2775 imapp = &imaps[0];
2776 nimaps = 1;
2777 bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0);
2778 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
2779 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
2781 /* Generate a DMAPI event if needed. */
2782 if (alloc_type != 0 && offset < ip->i_size &&
2783 (attr_flags & XFS_ATTR_DMI) == 0 &&
2784 DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) {
2785 xfs_off_t end_dmi_offset;
2787 end_dmi_offset = offset+len;
2788 if (end_dmi_offset > ip->i_size)
2789 end_dmi_offset = ip->i_size;
2790 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, offset,
2791 end_dmi_offset - offset, 0, NULL);
2792 if (error)
2793 return error;
2797 * Allocate file space until done or until there is an error
2799 retry:
2800 while (allocatesize_fsb && !error) {
2801 xfs_fileoff_t s, e;
2804 * Determine space reservations for data/realtime.
2806 if (unlikely(extsz)) {
2807 s = startoffset_fsb;
2808 do_div(s, extsz);
2809 s *= extsz;
2810 e = startoffset_fsb + allocatesize_fsb;
2811 if ((temp = do_mod(startoffset_fsb, extsz)))
2812 e += temp;
2813 if ((temp = do_mod(e, extsz)))
2814 e += extsz - temp;
2815 } else {
2816 s = 0;
2817 e = allocatesize_fsb;
2820 if (unlikely(rt)) {
2821 resrtextents = qblocks = (uint)(e - s);
2822 resrtextents /= mp->m_sb.sb_rextsize;
2823 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
2824 quota_flag = XFS_QMOPT_RES_RTBLKS;
2825 } else {
2826 resrtextents = 0;
2827 resblks = qblocks = \
2828 XFS_DIOSTRAT_SPACE_RES(mp, (uint)(e - s));
2829 quota_flag = XFS_QMOPT_RES_REGBLKS;
2833 * Allocate and setup the transaction.
2835 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
2836 error = xfs_trans_reserve(tp, resblks,
2837 XFS_WRITE_LOG_RES(mp), resrtextents,
2838 XFS_TRANS_PERM_LOG_RES,
2839 XFS_WRITE_LOG_COUNT);
2841 * Check for running out of space
2843 if (error) {
2845 * Free the transaction structure.
2847 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
2848 xfs_trans_cancel(tp, 0);
2849 break;
2851 xfs_ilock(ip, XFS_ILOCK_EXCL);
2852 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
2853 qblocks, 0, quota_flag);
2854 if (error)
2855 goto error1;
2857 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2858 xfs_trans_ihold(tp, ip);
2861 * Issue the xfs_bmapi() call to allocate the blocks
2863 xfs_bmap_init(&free_list, &firstfsb);
2864 error = xfs_bmapi(tp, ip, startoffset_fsb,
2865 allocatesize_fsb, bmapi_flag,
2866 &firstfsb, 0, imapp, &nimaps,
2867 &free_list, NULL);
2868 if (error) {
2869 goto error0;
2873 * Complete the transaction
2875 error = xfs_bmap_finish(&tp, &free_list, &committed);
2876 if (error) {
2877 goto error0;
2880 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2881 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2882 if (error) {
2883 break;
2886 allocated_fsb = imapp->br_blockcount;
2888 if (nimaps == 0) {
2889 error = XFS_ERROR(ENOSPC);
2890 break;
2893 startoffset_fsb += allocated_fsb;
2894 allocatesize_fsb -= allocated_fsb;
2896 dmapi_enospc_check:
2897 if (error == ENOSPC && (attr_flags & XFS_ATTR_DMI) == 0 &&
2898 DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE)) {
2899 error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE,
2900 ip, DM_RIGHT_NULL,
2901 ip, DM_RIGHT_NULL,
2902 NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */
2903 if (error == 0)
2904 goto retry; /* Maybe DMAPI app. has made space */
2905 /* else fall through with error from XFS_SEND_DATA */
2908 return error;
2910 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
2911 xfs_bmap_cancel(&free_list);
2912 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
2914 error1: /* Just cancel transaction */
2915 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
2916 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2917 goto dmapi_enospc_check;
2921 * Zero file bytes between startoff and endoff inclusive.
2922 * The iolock is held exclusive and no blocks are buffered.
2924 * This function is used by xfs_free_file_space() to zero
2925 * partial blocks when the range to free is not block aligned.
2926 * When unreserving space with boundaries that are not block
2927 * aligned we round up the start and round down the end
2928 * boundaries and then use this function to zero the parts of
2929 * the blocks that got dropped during the rounding.
2931 STATIC int
2932 xfs_zero_remaining_bytes(
2933 xfs_inode_t *ip,
2934 xfs_off_t startoff,
2935 xfs_off_t endoff)
2937 xfs_bmbt_irec_t imap;
2938 xfs_fileoff_t offset_fsb;
2939 xfs_off_t lastoffset;
2940 xfs_off_t offset;
2941 xfs_buf_t *bp;
2942 xfs_mount_t *mp = ip->i_mount;
2943 int nimap;
2944 int error = 0;
2947 * Avoid doing I/O beyond eof - it's not necessary
2948 * since nothing can read beyond eof. The space will
2949 * be zeroed when the file is extended anyway.
2951 if (startoff >= ip->i_size)
2952 return 0;
2954 if (endoff > ip->i_size)
2955 endoff = ip->i_size;
2957 bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
2958 XFS_IS_REALTIME_INODE(ip) ?
2959 mp->m_rtdev_targp : mp->m_ddev_targp);
2960 if (!bp)
2961 return XFS_ERROR(ENOMEM);
2963 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
2964 offset_fsb = XFS_B_TO_FSBT(mp, offset);
2965 nimap = 1;
2966 error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0,
2967 NULL, 0, &imap, &nimap, NULL, NULL);
2968 if (error || nimap < 1)
2969 break;
2970 ASSERT(imap.br_blockcount >= 1);
2971 ASSERT(imap.br_startoff == offset_fsb);
2972 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
2973 if (lastoffset > endoff)
2974 lastoffset = endoff;
2975 if (imap.br_startblock == HOLESTARTBLOCK)
2976 continue;
2977 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
2978 if (imap.br_state == XFS_EXT_UNWRITTEN)
2979 continue;
2980 XFS_BUF_UNDONE(bp);
2981 XFS_BUF_UNWRITE(bp);
2982 XFS_BUF_READ(bp);
2983 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
2984 xfsbdstrat(mp, bp);
2985 error = xfs_iowait(bp);
2986 if (error) {
2987 xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
2988 mp, bp, XFS_BUF_ADDR(bp));
2989 break;
2991 memset(XFS_BUF_PTR(bp) +
2992 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
2993 0, lastoffset - offset + 1);
2994 XFS_BUF_UNDONE(bp);
2995 XFS_BUF_UNREAD(bp);
2996 XFS_BUF_WRITE(bp);
2997 xfsbdstrat(mp, bp);
2998 error = xfs_iowait(bp);
2999 if (error) {
3000 xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
3001 mp, bp, XFS_BUF_ADDR(bp));
3002 break;
3005 xfs_buf_free(bp);
3006 return error;
3010 * xfs_free_file_space()
3011 * This routine frees disk space for the given file.
3013 * This routine is only called by xfs_change_file_space
3014 * for an UNRESVSP type call.
3016 * RETURNS:
3017 * 0 on success
3018 * errno on error
3021 STATIC int
3022 xfs_free_file_space(
3023 xfs_inode_t *ip,
3024 xfs_off_t offset,
3025 xfs_off_t len,
3026 int attr_flags)
3028 int committed;
3029 int done;
3030 xfs_off_t end_dmi_offset;
3031 xfs_fileoff_t endoffset_fsb;
3032 int error;
3033 xfs_fsblock_t firstfsb;
3034 xfs_bmap_free_t free_list;
3035 xfs_bmbt_irec_t imap;
3036 xfs_off_t ioffset;
3037 xfs_extlen_t mod=0;
3038 xfs_mount_t *mp;
3039 int nimap;
3040 uint resblks;
3041 uint rounding;
3042 int rt;
3043 xfs_fileoff_t startoffset_fsb;
3044 xfs_trans_t *tp;
3045 int need_iolock = 1;
3047 mp = ip->i_mount;
3049 xfs_itrace_entry(ip);
3051 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
3052 return error;
3054 error = 0;
3055 if (len <= 0) /* if nothing being freed */
3056 return error;
3057 rt = XFS_IS_REALTIME_INODE(ip);
3058 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
3059 end_dmi_offset = offset + len;
3060 endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset);
3062 if (offset < ip->i_size && (attr_flags & XFS_ATTR_DMI) == 0 &&
3063 DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) {
3064 if (end_dmi_offset > ip->i_size)
3065 end_dmi_offset = ip->i_size;
3066 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip,
3067 offset, end_dmi_offset - offset,
3068 AT_DELAY_FLAG(attr_flags), NULL);
3069 if (error)
3070 return error;
3073 if (attr_flags & XFS_ATTR_NOLOCK)
3074 need_iolock = 0;
3075 if (need_iolock) {
3076 xfs_ilock(ip, XFS_IOLOCK_EXCL);
3077 /* wait for the completion of any pending DIOs */
3078 xfs_ioend_wait(ip);
3081 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
3082 ioffset = offset & ~(rounding - 1);
3084 if (VN_CACHED(VFS_I(ip)) != 0) {
3085 xfs_inval_cached_trace(ip, ioffset, -1, ioffset, -1);
3086 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
3087 if (error)
3088 goto out_unlock_iolock;
3092 * Need to zero the stuff we're not freeing, on disk.
3093 * If its a realtime file & can't use unwritten extents then we
3094 * actually need to zero the extent edges. Otherwise xfs_bunmapi
3095 * will take care of it for us.
3097 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
3098 nimap = 1;
3099 error = xfs_bmapi(NULL, ip, startoffset_fsb,
3100 1, 0, NULL, 0, &imap, &nimap, NULL, NULL);
3101 if (error)
3102 goto out_unlock_iolock;
3103 ASSERT(nimap == 0 || nimap == 1);
3104 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
3105 xfs_daddr_t block;
3107 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
3108 block = imap.br_startblock;
3109 mod = do_div(block, mp->m_sb.sb_rextsize);
3110 if (mod)
3111 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
3113 nimap = 1;
3114 error = xfs_bmapi(NULL, ip, endoffset_fsb - 1,
3115 1, 0, NULL, 0, &imap, &nimap, NULL, NULL);
3116 if (error)
3117 goto out_unlock_iolock;
3118 ASSERT(nimap == 0 || nimap == 1);
3119 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
3120 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
3121 mod++;
3122 if (mod && (mod != mp->m_sb.sb_rextsize))
3123 endoffset_fsb -= mod;
3126 if ((done = (endoffset_fsb <= startoffset_fsb)))
3128 * One contiguous piece to clear
3130 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
3131 else {
3133 * Some full blocks, possibly two pieces to clear
3135 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
3136 error = xfs_zero_remaining_bytes(ip, offset,
3137 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
3138 if (!error &&
3139 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
3140 error = xfs_zero_remaining_bytes(ip,
3141 XFS_FSB_TO_B(mp, endoffset_fsb),
3142 offset + len - 1);
3146 * free file space until done or until there is an error
3148 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
3149 while (!error && !done) {
3152 * allocate and setup the transaction. Allow this
3153 * transaction to dip into the reserve blocks to ensure
3154 * the freeing of the space succeeds at ENOSPC.
3156 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
3157 tp->t_flags |= XFS_TRANS_RESERVE;
3158 error = xfs_trans_reserve(tp,
3159 resblks,
3160 XFS_WRITE_LOG_RES(mp),
3162 XFS_TRANS_PERM_LOG_RES,
3163 XFS_WRITE_LOG_COUNT);
3166 * check for running out of space
3168 if (error) {
3170 * Free the transaction structure.
3172 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
3173 xfs_trans_cancel(tp, 0);
3174 break;
3176 xfs_ilock(ip, XFS_ILOCK_EXCL);
3177 error = XFS_TRANS_RESERVE_QUOTA(mp, tp,
3178 ip->i_udquot, ip->i_gdquot, resblks, 0,
3179 XFS_QMOPT_RES_REGBLKS);
3180 if (error)
3181 goto error1;
3183 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3184 xfs_trans_ihold(tp, ip);
3187 * issue the bunmapi() call to free the blocks
3189 xfs_bmap_init(&free_list, &firstfsb);
3190 error = xfs_bunmapi(tp, ip, startoffset_fsb,
3191 endoffset_fsb - startoffset_fsb,
3192 0, 2, &firstfsb, &free_list, NULL, &done);
3193 if (error) {
3194 goto error0;
3198 * complete the transaction
3200 error = xfs_bmap_finish(&tp, &free_list, &committed);
3201 if (error) {
3202 goto error0;
3205 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3206 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3209 out_unlock_iolock:
3210 if (need_iolock)
3211 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
3212 return error;
3214 error0:
3215 xfs_bmap_cancel(&free_list);
3216 error1:
3217 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
3218 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
3219 XFS_ILOCK_EXCL);
3220 return error;
3224 * xfs_change_file_space()
3225 * This routine allocates or frees disk space for the given file.
3226 * The user specified parameters are checked for alignment and size
3227 * limitations.
3229 * RETURNS:
3230 * 0 on success
3231 * errno on error
3235 xfs_change_file_space(
3236 xfs_inode_t *ip,
3237 int cmd,
3238 xfs_flock64_t *bf,
3239 xfs_off_t offset,
3240 int attr_flags)
3242 xfs_mount_t *mp = ip->i_mount;
3243 int clrprealloc;
3244 int error;
3245 xfs_fsize_t fsize;
3246 int setprealloc;
3247 xfs_off_t startoffset;
3248 xfs_off_t llen;
3249 xfs_trans_t *tp;
3250 struct iattr iattr;
3252 xfs_itrace_entry(ip);
3254 if (!S_ISREG(ip->i_d.di_mode))
3255 return XFS_ERROR(EINVAL);
3257 switch (bf->l_whence) {
3258 case 0: /*SEEK_SET*/
3259 break;
3260 case 1: /*SEEK_CUR*/
3261 bf->l_start += offset;
3262 break;
3263 case 2: /*SEEK_END*/
3264 bf->l_start += ip->i_size;
3265 break;
3266 default:
3267 return XFS_ERROR(EINVAL);
3270 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
3272 if ( (bf->l_start < 0)
3273 || (bf->l_start > XFS_MAXIOFFSET(mp))
3274 || (bf->l_start + llen < 0)
3275 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
3276 return XFS_ERROR(EINVAL);
3278 bf->l_whence = 0;
3280 startoffset = bf->l_start;
3281 fsize = ip->i_size;
3284 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
3285 * file space.
3286 * These calls do NOT zero the data space allocated to the file,
3287 * nor do they change the file size.
3289 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
3290 * space.
3291 * These calls cause the new file data to be zeroed and the file
3292 * size to be changed.
3294 setprealloc = clrprealloc = 0;
3296 switch (cmd) {
3297 case XFS_IOC_RESVSP:
3298 case XFS_IOC_RESVSP64:
3299 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
3300 1, attr_flags);
3301 if (error)
3302 return error;
3303 setprealloc = 1;
3304 break;
3306 case XFS_IOC_UNRESVSP:
3307 case XFS_IOC_UNRESVSP64:
3308 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
3309 attr_flags)))
3310 return error;
3311 break;
3313 case XFS_IOC_ALLOCSP:
3314 case XFS_IOC_ALLOCSP64:
3315 case XFS_IOC_FREESP:
3316 case XFS_IOC_FREESP64:
3317 if (startoffset > fsize) {
3318 error = xfs_alloc_file_space(ip, fsize,
3319 startoffset - fsize, 0, attr_flags);
3320 if (error)
3321 break;
3324 iattr.ia_valid = ATTR_SIZE;
3325 iattr.ia_size = startoffset;
3327 error = xfs_setattr(ip, &iattr, attr_flags);
3329 if (error)
3330 return error;
3332 clrprealloc = 1;
3333 break;
3335 default:
3336 ASSERT(0);
3337 return XFS_ERROR(EINVAL);
3341 * update the inode timestamp, mode, and prealloc flag bits
3343 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
3345 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
3346 0, 0, 0))) {
3347 /* ASSERT(0); */
3348 xfs_trans_cancel(tp, 0);
3349 return error;
3352 xfs_ilock(ip, XFS_ILOCK_EXCL);
3354 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3355 xfs_trans_ihold(tp, ip);
3357 if ((attr_flags & XFS_ATTR_DMI) == 0) {
3358 ip->i_d.di_mode &= ~S_ISUID;
3361 * Note that we don't have to worry about mandatory
3362 * file locking being disabled here because we only
3363 * clear the S_ISGID bit if the Group execute bit is
3364 * on, but if it was on then mandatory locking wouldn't
3365 * have been enabled.
3367 if (ip->i_d.di_mode & S_IXGRP)
3368 ip->i_d.di_mode &= ~S_ISGID;
3370 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3372 if (setprealloc)
3373 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
3374 else if (clrprealloc)
3375 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
3377 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3378 xfs_trans_set_sync(tp);
3380 error = xfs_trans_commit(tp, 0);
3382 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3384 return error;