Ath5k: fix bintval setup
[linux-2.6/mini2440.git] / fs / xfs / xfs_vnodeops.c
blobaa238c8fbd7ae605e9f316969bb3012ee4c32f3c
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_open(
58 xfs_inode_t *ip)
60 int mode;
62 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
63 return XFS_ERROR(EIO);
66 * If it's a directory with any blocks, read-ahead block 0
67 * as we're almost certain to have the next operation be a read there.
69 if (S_ISDIR(ip->i_d.di_mode) && ip->i_d.di_nextents > 0) {
70 mode = xfs_ilock_map_shared(ip);
71 if (ip->i_d.di_nextents > 0)
72 (void)xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK);
73 xfs_iunlock(ip, mode);
75 return 0;
78 int
79 xfs_setattr(
80 struct xfs_inode *ip,
81 struct iattr *iattr,
82 int flags,
83 cred_t *credp)
85 xfs_mount_t *mp = ip->i_mount;
86 struct inode *inode = VFS_I(ip);
87 int mask = iattr->ia_valid;
88 xfs_trans_t *tp;
89 int code;
90 uint lock_flags;
91 uint commit_flags=0;
92 uid_t uid=0, iuid=0;
93 gid_t gid=0, igid=0;
94 int timeflags = 0;
95 struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2;
96 int file_owner;
97 int need_iolock = 1;
99 xfs_itrace_entry(ip);
101 if (mp->m_flags & XFS_MOUNT_RDONLY)
102 return XFS_ERROR(EROFS);
104 if (XFS_FORCED_SHUTDOWN(mp))
105 return XFS_ERROR(EIO);
107 olddquot1 = olddquot2 = NULL;
108 udqp = gdqp = NULL;
111 * If disk quotas is on, we make sure that the dquots do exist on disk,
112 * before we start any other transactions. Trying to do this later
113 * is messy. We don't care to take a readlock to look at the ids
114 * in inode here, because we can't hold it across the trans_reserve.
115 * If the IDs do change before we take the ilock, we're covered
116 * because the i_*dquot fields will get updated anyway.
118 if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
119 uint qflags = 0;
121 if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
122 uid = iattr->ia_uid;
123 qflags |= XFS_QMOPT_UQUOTA;
124 } else {
125 uid = ip->i_d.di_uid;
127 if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
128 gid = iattr->ia_gid;
129 qflags |= XFS_QMOPT_GQUOTA;
130 } else {
131 gid = ip->i_d.di_gid;
135 * We take a reference when we initialize udqp and gdqp,
136 * so it is important that we never blindly double trip on
137 * the same variable. See xfs_create() for an example.
139 ASSERT(udqp == NULL);
140 ASSERT(gdqp == NULL);
141 code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, ip->i_d.di_projid,
142 qflags, &udqp, &gdqp);
143 if (code)
144 return code;
148 * For the other attributes, we acquire the inode lock and
149 * first do an error checking pass.
151 tp = NULL;
152 lock_flags = XFS_ILOCK_EXCL;
153 if (flags & XFS_ATTR_NOLOCK)
154 need_iolock = 0;
155 if (!(mask & ATTR_SIZE)) {
156 if ((mask != (ATTR_CTIME|ATTR_ATIME|ATTR_MTIME)) ||
157 (mp->m_flags & XFS_MOUNT_WSYNC)) {
158 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
159 commit_flags = 0;
160 if ((code = xfs_trans_reserve(tp, 0,
161 XFS_ICHANGE_LOG_RES(mp), 0,
162 0, 0))) {
163 lock_flags = 0;
164 goto error_return;
167 } else {
168 if (DM_EVENT_ENABLED(ip, DM_EVENT_TRUNCATE) &&
169 !(flags & XFS_ATTR_DMI)) {
170 int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR;
171 code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, ip,
172 iattr->ia_size, 0, dmflags, NULL);
173 if (code) {
174 lock_flags = 0;
175 goto error_return;
178 if (need_iolock)
179 lock_flags |= XFS_IOLOCK_EXCL;
182 xfs_ilock(ip, lock_flags);
184 /* boolean: are we the file owner? */
185 file_owner = (current_fsuid() == ip->i_d.di_uid);
188 * Change various properties of a file.
189 * Only the owner or users with CAP_FOWNER
190 * capability may do these things.
192 if (mask & (ATTR_MODE|ATTR_UID|ATTR_GID)) {
194 * CAP_FOWNER overrides the following restrictions:
196 * The user ID of the calling process must be equal
197 * to the file owner ID, except in cases where the
198 * CAP_FSETID capability is applicable.
200 if (!file_owner && !capable(CAP_FOWNER)) {
201 code = XFS_ERROR(EPERM);
202 goto error_return;
206 * CAP_FSETID overrides the following restrictions:
208 * The effective user ID of the calling process shall match
209 * the file owner when setting the set-user-ID and
210 * set-group-ID bits on that file.
212 * The effective group ID or one of the supplementary group
213 * IDs of the calling process shall match the group owner of
214 * the file when setting the set-group-ID bit on that file
216 if (mask & ATTR_MODE) {
217 mode_t m = 0;
219 if ((iattr->ia_mode & S_ISUID) && !file_owner)
220 m |= S_ISUID;
221 if ((iattr->ia_mode & S_ISGID) &&
222 !in_group_p((gid_t)ip->i_d.di_gid))
223 m |= S_ISGID;
224 #if 0
225 /* Linux allows this, Irix doesn't. */
226 if ((iattr->ia_mode & S_ISVTX) && !S_ISDIR(ip->i_d.di_mode))
227 m |= S_ISVTX;
228 #endif
229 if (m && !capable(CAP_FSETID))
230 iattr->ia_mode &= ~m;
235 * Change file ownership. Must be the owner or privileged.
236 * If the system was configured with the "restricted_chown"
237 * option, the owner is not permitted to give away the file,
238 * and can change the group id only to a group of which he
239 * or she is a member.
241 if (mask & (ATTR_UID|ATTR_GID)) {
243 * These IDs could have changed since we last looked at them.
244 * But, we're assured that if the ownership did change
245 * while we didn't have the inode locked, inode's dquot(s)
246 * would have changed also.
248 iuid = ip->i_d.di_uid;
249 igid = ip->i_d.di_gid;
250 gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
251 uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
254 * CAP_CHOWN overrides the following restrictions:
256 * If _POSIX_CHOWN_RESTRICTED is defined, this capability
257 * shall override the restriction that a process cannot
258 * change the user ID of a file it owns and the restriction
259 * that the group ID supplied to the chown() function
260 * shall be equal to either the group ID or one of the
261 * supplementary group IDs of the calling process.
263 if (restricted_chown &&
264 (iuid != uid || (igid != gid &&
265 !in_group_p((gid_t)gid))) &&
266 !capable(CAP_CHOWN)) {
267 code = XFS_ERROR(EPERM);
268 goto error_return;
271 * Do a quota reservation only if uid/gid is actually
272 * going to change.
274 if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
275 (XFS_IS_GQUOTA_ON(mp) && igid != gid)) {
276 ASSERT(tp);
277 code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp,
278 capable(CAP_FOWNER) ?
279 XFS_QMOPT_FORCE_RES : 0);
280 if (code) /* out of quota */
281 goto error_return;
286 * Truncate file. Must have write permission and not be a directory.
288 if (mask & ATTR_SIZE) {
289 /* Short circuit the truncate case for zero length files */
290 if (iattr->ia_size == 0 &&
291 ip->i_size == 0 && ip->i_d.di_nextents == 0) {
292 xfs_iunlock(ip, XFS_ILOCK_EXCL);
293 lock_flags &= ~XFS_ILOCK_EXCL;
294 if (mask & ATTR_CTIME)
295 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
296 code = 0;
297 goto error_return;
300 if (S_ISDIR(ip->i_d.di_mode)) {
301 code = XFS_ERROR(EISDIR);
302 goto error_return;
303 } else if (!S_ISREG(ip->i_d.di_mode)) {
304 code = XFS_ERROR(EINVAL);
305 goto error_return;
308 * Make sure that the dquots are attached to the inode.
310 if ((code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED)))
311 goto error_return;
315 * Change file access or modified times.
317 if (mask & (ATTR_ATIME|ATTR_MTIME)) {
318 if (!file_owner) {
319 if ((mask & (ATTR_MTIME_SET|ATTR_ATIME_SET)) &&
320 !capable(CAP_FOWNER)) {
321 code = XFS_ERROR(EPERM);
322 goto error_return;
328 * Now we can make the changes. Before we join the inode
329 * to the transaction, if ATTR_SIZE is set then take care of
330 * the part of the truncation that must be done without the
331 * inode lock. This needs to be done before joining the inode
332 * to the transaction, because the inode cannot be unlocked
333 * once it is a part of the transaction.
335 if (mask & ATTR_SIZE) {
336 code = 0;
337 if (iattr->ia_size > ip->i_size) {
339 * Do the first part of growing a file: zero any data
340 * in the last block that is beyond the old EOF. We
341 * need to do this before the inode is joined to the
342 * transaction to modify the i_size.
344 code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size);
346 xfs_iunlock(ip, XFS_ILOCK_EXCL);
349 * We are going to log the inode size change in this
350 * transaction so any previous writes that are beyond the on
351 * disk EOF and the new EOF that have not been written out need
352 * to be written here. If we do not write the data out, we
353 * expose ourselves to the null files problem.
355 * Only flush from the on disk size to the smaller of the in
356 * memory file size or the new size as that's the range we
357 * really care about here and prevents waiting for other data
358 * not within the range we care about here.
360 if (!code &&
361 ip->i_size != ip->i_d.di_size &&
362 iattr->ia_size > ip->i_d.di_size) {
363 code = xfs_flush_pages(ip,
364 ip->i_d.di_size, iattr->ia_size,
365 XFS_B_ASYNC, FI_NONE);
368 /* wait for all I/O to complete */
369 vn_iowait(ip);
371 if (!code)
372 code = xfs_itruncate_data(ip, iattr->ia_size);
373 if (code) {
374 ASSERT(tp == NULL);
375 lock_flags &= ~XFS_ILOCK_EXCL;
376 ASSERT(lock_flags == XFS_IOLOCK_EXCL);
377 goto error_return;
379 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
380 if ((code = xfs_trans_reserve(tp, 0,
381 XFS_ITRUNCATE_LOG_RES(mp), 0,
382 XFS_TRANS_PERM_LOG_RES,
383 XFS_ITRUNCATE_LOG_COUNT))) {
384 xfs_trans_cancel(tp, 0);
385 if (need_iolock)
386 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
387 return code;
389 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
390 xfs_ilock(ip, XFS_ILOCK_EXCL);
393 if (tp) {
394 xfs_trans_ijoin(tp, ip, lock_flags);
395 xfs_trans_ihold(tp, ip);
399 * Truncate file. Must have write permission and not be a directory.
401 if (mask & ATTR_SIZE) {
403 * Only change the c/mtime if we are changing the size
404 * or we are explicitly asked to change it. This handles
405 * the semantic difference between truncate() and ftruncate()
406 * as implemented in the VFS.
408 if (iattr->ia_size != ip->i_size || (mask & ATTR_CTIME))
409 timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
411 if (iattr->ia_size > ip->i_size) {
412 ip->i_d.di_size = iattr->ia_size;
413 ip->i_size = iattr->ia_size;
414 if (!(flags & XFS_ATTR_DMI))
415 xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
416 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
417 } else if (iattr->ia_size <= ip->i_size ||
418 (iattr->ia_size == 0 && ip->i_d.di_nextents)) {
420 * signal a sync transaction unless
421 * we're truncating an already unlinked
422 * file on a wsync filesystem
424 code = xfs_itruncate_finish(&tp, ip, iattr->ia_size,
425 XFS_DATA_FORK,
426 ((ip->i_d.di_nlink != 0 ||
427 !(mp->m_flags & XFS_MOUNT_WSYNC))
428 ? 1 : 0));
429 if (code)
430 goto abort_return;
432 * Truncated "down", so we're removing references
433 * to old data here - if we now delay flushing for
434 * a long time, we expose ourselves unduly to the
435 * notorious NULL files problem. So, we mark this
436 * vnode and flush it when the file is closed, and
437 * do not wait the usual (long) time for writeout.
439 xfs_iflags_set(ip, XFS_ITRUNCATED);
444 * Change file access modes.
446 if (mask & ATTR_MODE) {
447 ip->i_d.di_mode &= S_IFMT;
448 ip->i_d.di_mode |= iattr->ia_mode & ~S_IFMT;
450 inode->i_mode &= S_IFMT;
451 inode->i_mode |= iattr->ia_mode & ~S_IFMT;
453 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
454 timeflags |= XFS_ICHGTIME_CHG;
458 * Change file ownership. Must be the owner or privileged.
459 * If the system was configured with the "restricted_chown"
460 * option, the owner is not permitted to give away the file,
461 * and can change the group id only to a group of which he
462 * or she is a member.
464 if (mask & (ATTR_UID|ATTR_GID)) {
466 * CAP_FSETID overrides the following restrictions:
468 * The set-user-ID and set-group-ID bits of a file will be
469 * cleared upon successful return from chown()
471 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
472 !capable(CAP_FSETID)) {
473 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
477 * Change the ownerships and register quota modifications
478 * in the transaction.
480 if (iuid != uid) {
481 if (XFS_IS_UQUOTA_ON(mp)) {
482 ASSERT(mask & ATTR_UID);
483 ASSERT(udqp);
484 olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
485 &ip->i_udquot, udqp);
487 ip->i_d.di_uid = uid;
488 inode->i_uid = uid;
490 if (igid != gid) {
491 if (XFS_IS_GQUOTA_ON(mp)) {
492 ASSERT(!XFS_IS_PQUOTA_ON(mp));
493 ASSERT(mask & ATTR_GID);
494 ASSERT(gdqp);
495 olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
496 &ip->i_gdquot, gdqp);
498 ip->i_d.di_gid = gid;
499 inode->i_gid = gid;
502 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
503 timeflags |= XFS_ICHGTIME_CHG;
508 * Change file access or modified times.
510 if (mask & (ATTR_ATIME|ATTR_MTIME)) {
511 if (mask & ATTR_ATIME) {
512 inode->i_atime = iattr->ia_atime;
513 ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
514 ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
515 ip->i_update_core = 1;
517 if (mask & ATTR_MTIME) {
518 inode->i_mtime = iattr->ia_mtime;
519 ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
520 ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
521 timeflags &= ~XFS_ICHGTIME_MOD;
522 timeflags |= XFS_ICHGTIME_CHG;
524 if (tp && (mask & (ATTR_MTIME_SET|ATTR_ATIME_SET)))
525 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
529 * Change file inode change time only if ATTR_CTIME set
530 * AND we have been called by a DMI function.
533 if ((flags & XFS_ATTR_DMI) && (mask & ATTR_CTIME)) {
534 inode->i_ctime = iattr->ia_ctime;
535 ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
536 ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
537 ip->i_update_core = 1;
538 timeflags &= ~XFS_ICHGTIME_CHG;
542 * Send out timestamp changes that need to be set to the
543 * current time. Not done when called by a DMI function.
545 if (timeflags && !(flags & XFS_ATTR_DMI))
546 xfs_ichgtime(ip, timeflags);
548 XFS_STATS_INC(xs_ig_attrchg);
551 * If this is a synchronous mount, make sure that the
552 * transaction goes to disk before returning to the user.
553 * This is slightly sub-optimal in that truncates require
554 * two sync transactions instead of one for wsync filesystems.
555 * One for the truncate and one for the timestamps since we
556 * don't want to change the timestamps unless we're sure the
557 * truncate worked. Truncates are less than 1% of the laddis
558 * mix so this probably isn't worth the trouble to optimize.
560 code = 0;
561 if (tp) {
562 if (mp->m_flags & XFS_MOUNT_WSYNC)
563 xfs_trans_set_sync(tp);
565 code = xfs_trans_commit(tp, commit_flags);
568 xfs_iunlock(ip, lock_flags);
571 * Release any dquot(s) the inode had kept before chown.
573 XFS_QM_DQRELE(mp, olddquot1);
574 XFS_QM_DQRELE(mp, olddquot2);
575 XFS_QM_DQRELE(mp, udqp);
576 XFS_QM_DQRELE(mp, gdqp);
578 if (code) {
579 return code;
582 if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE) &&
583 !(flags & XFS_ATTR_DMI)) {
584 (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, ip, DM_RIGHT_NULL,
585 NULL, DM_RIGHT_NULL, NULL, NULL,
586 0, 0, AT_DELAY_FLAG(flags));
588 return 0;
590 abort_return:
591 commit_flags |= XFS_TRANS_ABORT;
592 /* FALLTHROUGH */
593 error_return:
594 XFS_QM_DQRELE(mp, udqp);
595 XFS_QM_DQRELE(mp, gdqp);
596 if (tp) {
597 xfs_trans_cancel(tp, commit_flags);
599 if (lock_flags != 0) {
600 xfs_iunlock(ip, lock_flags);
602 return code;
606 * The maximum pathlen is 1024 bytes. Since the minimum file system
607 * blocksize is 512 bytes, we can get a max of 2 extents back from
608 * bmapi.
610 #define SYMLINK_MAPS 2
612 STATIC int
613 xfs_readlink_bmap(
614 xfs_inode_t *ip,
615 char *link)
617 xfs_mount_t *mp = ip->i_mount;
618 int pathlen = ip->i_d.di_size;
619 int nmaps = SYMLINK_MAPS;
620 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
621 xfs_daddr_t d;
622 int byte_cnt;
623 int n;
624 xfs_buf_t *bp;
625 int error = 0;
627 error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0,
628 mval, &nmaps, NULL, NULL);
629 if (error)
630 goto out;
632 for (n = 0; n < nmaps; n++) {
633 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
634 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
636 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
637 error = XFS_BUF_GETERROR(bp);
638 if (error) {
639 xfs_ioerror_alert("xfs_readlink",
640 ip->i_mount, bp, XFS_BUF_ADDR(bp));
641 xfs_buf_relse(bp);
642 goto out;
644 if (pathlen < byte_cnt)
645 byte_cnt = pathlen;
646 pathlen -= byte_cnt;
648 memcpy(link, XFS_BUF_PTR(bp), byte_cnt);
649 xfs_buf_relse(bp);
652 link[ip->i_d.di_size] = '\0';
653 error = 0;
655 out:
656 return error;
660 xfs_readlink(
661 xfs_inode_t *ip,
662 char *link)
664 xfs_mount_t *mp = ip->i_mount;
665 int pathlen;
666 int error = 0;
668 xfs_itrace_entry(ip);
670 if (XFS_FORCED_SHUTDOWN(mp))
671 return XFS_ERROR(EIO);
673 xfs_ilock(ip, XFS_ILOCK_SHARED);
675 ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
676 ASSERT(ip->i_d.di_size <= MAXPATHLEN);
678 pathlen = ip->i_d.di_size;
679 if (!pathlen)
680 goto out;
682 if (ip->i_df.if_flags & XFS_IFINLINE) {
683 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
684 link[pathlen] = '\0';
685 } else {
686 error = xfs_readlink_bmap(ip, link);
689 out:
690 xfs_iunlock(ip, XFS_ILOCK_SHARED);
691 return error;
695 * xfs_fsync
697 * This is called to sync the inode and its data out to disk. We need to hold
698 * the I/O lock while flushing the data, and the inode lock while flushing the
699 * inode. The inode lock CANNOT be held while flushing the data, so acquire
700 * after we're done with that.
703 xfs_fsync(
704 xfs_inode_t *ip)
706 xfs_trans_t *tp;
707 int error;
708 int log_flushed = 0, changed = 1;
710 xfs_itrace_entry(ip);
712 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
713 return XFS_ERROR(EIO);
715 /* capture size updates in I/O completion before writing the inode. */
716 error = filemap_fdatawait(VFS_I(ip)->i_mapping);
717 if (error)
718 return XFS_ERROR(error);
721 * We always need to make sure that the required inode state is safe on
722 * disk. The vnode might be clean but we still might need to force the
723 * log because of committed transactions that haven't hit the disk yet.
724 * Likewise, there could be unflushed non-transactional changes to the
725 * inode core that have to go to disk and this requires us to issue
726 * a synchronous transaction to capture these changes correctly.
728 * This code relies on the assumption that if the update_* fields
729 * of the inode are clear and the inode is unpinned then it is clean
730 * and no action is required.
732 xfs_ilock(ip, XFS_ILOCK_SHARED);
734 if (!(ip->i_update_size || ip->i_update_core)) {
736 * Timestamps/size haven't changed since last inode flush or
737 * inode transaction commit. That means either nothing got
738 * written or a transaction committed which caught the updates.
739 * If the latter happened and the transaction hasn't hit the
740 * disk yet, the inode will be still be pinned. If it is,
741 * force the log.
744 xfs_iunlock(ip, XFS_ILOCK_SHARED);
746 if (xfs_ipincount(ip)) {
747 error = _xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
748 XFS_LOG_FORCE | XFS_LOG_SYNC,
749 &log_flushed);
750 } else {
752 * If the inode is not pinned and nothing has changed
753 * we don't need to flush the cache.
755 changed = 0;
757 } else {
759 * Kick off a transaction to log the inode core to get the
760 * updates. The sync transaction will also force the log.
762 xfs_iunlock(ip, XFS_ILOCK_SHARED);
763 tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
764 error = xfs_trans_reserve(tp, 0,
765 XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
766 if (error) {
767 xfs_trans_cancel(tp, 0);
768 return error;
770 xfs_ilock(ip, XFS_ILOCK_EXCL);
773 * Note - it's possible that we might have pushed ourselves out
774 * of the way during trans_reserve which would flush the inode.
775 * But there's no guarantee that the inode buffer has actually
776 * gone out yet (it's delwri). Plus the buffer could be pinned
777 * anyway if it's part of an inode in another recent
778 * transaction. So we play it safe and fire off the
779 * transaction anyway.
781 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
782 xfs_trans_ihold(tp, ip);
783 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
784 xfs_trans_set_sync(tp);
785 error = _xfs_trans_commit(tp, 0, &log_flushed);
787 xfs_iunlock(ip, XFS_ILOCK_EXCL);
790 if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
792 * If the log write didn't issue an ordered tag we need
793 * to flush the disk cache for the data device now.
795 if (!log_flushed)
796 xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
799 * If this inode is on the RT dev we need to flush that
800 * cache as well.
802 if (XFS_IS_REALTIME_INODE(ip))
803 xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
806 return error;
810 * This is called by xfs_inactive to free any blocks beyond eof
811 * when the link count isn't zero and by xfs_dm_punch_hole() when
812 * punching a hole to EOF.
815 xfs_free_eofblocks(
816 xfs_mount_t *mp,
817 xfs_inode_t *ip,
818 int flags)
820 xfs_trans_t *tp;
821 int error;
822 xfs_fileoff_t end_fsb;
823 xfs_fileoff_t last_fsb;
824 xfs_filblks_t map_len;
825 int nimaps;
826 xfs_bmbt_irec_t imap;
827 int use_iolock = (flags & XFS_FREE_EOF_LOCK);
830 * Figure out if there are any blocks beyond the end
831 * of the file. If not, then there is nothing to do.
833 end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
834 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
835 map_len = last_fsb - end_fsb;
836 if (map_len <= 0)
837 return 0;
839 nimaps = 1;
840 xfs_ilock(ip, XFS_ILOCK_SHARED);
841 error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0,
842 NULL, 0, &imap, &nimaps, NULL, NULL);
843 xfs_iunlock(ip, XFS_ILOCK_SHARED);
845 if (!error && (nimaps != 0) &&
846 (imap.br_startblock != HOLESTARTBLOCK ||
847 ip->i_delayed_blks)) {
849 * Attach the dquots to the inode up front.
851 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
852 return error;
855 * There are blocks after the end of file.
856 * Free them up now by truncating the file to
857 * its current size.
859 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
862 * Do the xfs_itruncate_start() call before
863 * reserving any log space because
864 * itruncate_start will call into the buffer
865 * cache and we can't
866 * do that within a transaction.
868 if (use_iolock)
869 xfs_ilock(ip, XFS_IOLOCK_EXCL);
870 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
871 ip->i_size);
872 if (error) {
873 xfs_trans_cancel(tp, 0);
874 if (use_iolock)
875 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
876 return error;
879 error = xfs_trans_reserve(tp, 0,
880 XFS_ITRUNCATE_LOG_RES(mp),
881 0, XFS_TRANS_PERM_LOG_RES,
882 XFS_ITRUNCATE_LOG_COUNT);
883 if (error) {
884 ASSERT(XFS_FORCED_SHUTDOWN(mp));
885 xfs_trans_cancel(tp, 0);
886 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
887 return error;
890 xfs_ilock(ip, XFS_ILOCK_EXCL);
891 xfs_trans_ijoin(tp, ip,
892 XFS_IOLOCK_EXCL |
893 XFS_ILOCK_EXCL);
894 xfs_trans_ihold(tp, ip);
896 error = xfs_itruncate_finish(&tp, ip,
897 ip->i_size,
898 XFS_DATA_FORK,
901 * If we get an error at this point we
902 * simply don't bother truncating the file.
904 if (error) {
905 xfs_trans_cancel(tp,
906 (XFS_TRANS_RELEASE_LOG_RES |
907 XFS_TRANS_ABORT));
908 } else {
909 error = xfs_trans_commit(tp,
910 XFS_TRANS_RELEASE_LOG_RES);
912 xfs_iunlock(ip, (use_iolock ? (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)
913 : XFS_ILOCK_EXCL));
915 return error;
919 * Free a symlink that has blocks associated with it.
921 STATIC int
922 xfs_inactive_symlink_rmt(
923 xfs_inode_t *ip,
924 xfs_trans_t **tpp)
926 xfs_buf_t *bp;
927 int committed;
928 int done;
929 int error;
930 xfs_fsblock_t first_block;
931 xfs_bmap_free_t free_list;
932 int i;
933 xfs_mount_t *mp;
934 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
935 int nmaps;
936 xfs_trans_t *ntp;
937 int size;
938 xfs_trans_t *tp;
940 tp = *tpp;
941 mp = ip->i_mount;
942 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
944 * We're freeing a symlink that has some
945 * blocks allocated to it. Free the
946 * blocks here. We know that we've got
947 * either 1 or 2 extents and that we can
948 * free them all in one bunmapi call.
950 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
951 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
952 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
953 ASSERT(XFS_FORCED_SHUTDOWN(mp));
954 xfs_trans_cancel(tp, 0);
955 *tpp = NULL;
956 return error;
959 * Lock the inode, fix the size, and join it to the transaction.
960 * Hold it so in the normal path, we still have it locked for
961 * the second transaction. In the error paths we need it
962 * held so the cancel won't rele it, see below.
964 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
965 size = (int)ip->i_d.di_size;
966 ip->i_d.di_size = 0;
967 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
968 xfs_trans_ihold(tp, ip);
969 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
971 * Find the block(s) so we can inval and unmap them.
973 done = 0;
974 XFS_BMAP_INIT(&free_list, &first_block);
975 nmaps = ARRAY_SIZE(mval);
976 if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
977 XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
978 &free_list, NULL)))
979 goto error0;
981 * Invalidate the block(s).
983 for (i = 0; i < nmaps; i++) {
984 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
985 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
986 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
987 xfs_trans_binval(tp, bp);
990 * Unmap the dead block(s) to the free_list.
992 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
993 &first_block, &free_list, NULL, &done)))
994 goto error1;
995 ASSERT(done);
997 * Commit the first transaction. This logs the EFI and the inode.
999 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
1000 goto error1;
1002 * The transaction must have been committed, since there were
1003 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
1004 * The new tp has the extent freeing and EFDs.
1006 ASSERT(committed);
1008 * The first xact was committed, so add the inode to the new one.
1009 * Mark it dirty so it will be logged and moved forward in the log as
1010 * part of every commit.
1012 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1013 xfs_trans_ihold(tp, ip);
1014 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1016 * Get a new, empty transaction to return to our caller.
1018 ntp = xfs_trans_dup(tp);
1020 * Commit the transaction containing extent freeing and EFDs.
1021 * If we get an error on the commit here or on the reserve below,
1022 * we need to unlock the inode since the new transaction doesn't
1023 * have the inode attached.
1025 error = xfs_trans_commit(tp, 0);
1026 tp = ntp;
1027 if (error) {
1028 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1029 goto error0;
1032 * Remove the memory for extent descriptions (just bookkeeping).
1034 if (ip->i_df.if_bytes)
1035 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
1036 ASSERT(ip->i_df.if_bytes == 0);
1038 * Put an itruncate log reservation in the new transaction
1039 * for our caller.
1041 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
1042 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
1043 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1044 goto error0;
1047 * Return with the inode locked but not joined to the transaction.
1049 *tpp = tp;
1050 return 0;
1052 error1:
1053 xfs_bmap_cancel(&free_list);
1054 error0:
1056 * Have to come here with the inode locked and either
1057 * (held and in the transaction) or (not in the transaction).
1058 * If the inode isn't held then cancel would iput it, but
1059 * that's wrong since this is inactive and the vnode ref
1060 * count is 0 already.
1061 * Cancel won't do anything to the inode if held, but it still
1062 * needs to be locked until the cancel is done, if it was
1063 * joined to the transaction.
1065 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1066 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1067 *tpp = NULL;
1068 return error;
1072 STATIC int
1073 xfs_inactive_symlink_local(
1074 xfs_inode_t *ip,
1075 xfs_trans_t **tpp)
1077 int error;
1079 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
1081 * We're freeing a symlink which fit into
1082 * the inode. Just free the memory used
1083 * to hold the old symlink.
1085 error = xfs_trans_reserve(*tpp, 0,
1086 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
1087 0, XFS_TRANS_PERM_LOG_RES,
1088 XFS_ITRUNCATE_LOG_COUNT);
1090 if (error) {
1091 xfs_trans_cancel(*tpp, 0);
1092 *tpp = NULL;
1093 return error;
1095 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1098 * Zero length symlinks _can_ exist.
1100 if (ip->i_df.if_bytes > 0) {
1101 xfs_idata_realloc(ip,
1102 -(ip->i_df.if_bytes),
1103 XFS_DATA_FORK);
1104 ASSERT(ip->i_df.if_bytes == 0);
1106 return 0;
1109 STATIC int
1110 xfs_inactive_attrs(
1111 xfs_inode_t *ip,
1112 xfs_trans_t **tpp)
1114 xfs_trans_t *tp;
1115 int error;
1116 xfs_mount_t *mp;
1118 ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
1119 tp = *tpp;
1120 mp = ip->i_mount;
1121 ASSERT(ip->i_d.di_forkoff != 0);
1122 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1123 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1124 if (error)
1125 goto error_unlock;
1127 error = xfs_attr_inactive(ip);
1128 if (error)
1129 goto error_unlock;
1131 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1132 error = xfs_trans_reserve(tp, 0,
1133 XFS_IFREE_LOG_RES(mp),
1134 0, XFS_TRANS_PERM_LOG_RES,
1135 XFS_INACTIVE_LOG_COUNT);
1136 if (error)
1137 goto error_cancel;
1139 xfs_ilock(ip, XFS_ILOCK_EXCL);
1140 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1141 xfs_trans_ihold(tp, ip);
1142 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1144 ASSERT(ip->i_d.di_anextents == 0);
1146 *tpp = tp;
1147 return 0;
1149 error_cancel:
1150 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1151 xfs_trans_cancel(tp, 0);
1152 error_unlock:
1153 *tpp = NULL;
1154 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1155 return error;
1159 xfs_release(
1160 xfs_inode_t *ip)
1162 xfs_mount_t *mp = ip->i_mount;
1163 int error;
1165 if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0))
1166 return 0;
1168 /* If this is a read-only mount, don't do this (would generate I/O) */
1169 if (mp->m_flags & XFS_MOUNT_RDONLY)
1170 return 0;
1172 if (!XFS_FORCED_SHUTDOWN(mp)) {
1173 int truncated;
1176 * If we are using filestreams, and we have an unlinked
1177 * file that we are processing the last close on, then nothing
1178 * will be able to reopen and write to this file. Purge this
1179 * inode from the filestreams cache so that it doesn't delay
1180 * teardown of the inode.
1182 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
1183 xfs_filestream_deassociate(ip);
1186 * If we previously truncated this file and removed old data
1187 * in the process, we want to initiate "early" writeout on
1188 * the last close. This is an attempt to combat the notorious
1189 * NULL files problem which is particularly noticable from a
1190 * truncate down, buffered (re-)write (delalloc), followed by
1191 * a crash. What we are effectively doing here is
1192 * significantly reducing the time window where we'd otherwise
1193 * be exposed to that problem.
1195 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
1196 if (truncated && VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
1197 xfs_flush_pages(ip, 0, -1, XFS_B_ASYNC, FI_NONE);
1200 if (ip->i_d.di_nlink != 0) {
1201 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1202 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
1203 ip->i_delayed_blks > 0)) &&
1204 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
1205 (!(ip->i_d.di_flags &
1206 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
1207 error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK);
1208 if (error)
1209 return error;
1213 return 0;
1217 * xfs_inactive
1219 * This is called when the vnode reference count for the vnode
1220 * goes to zero. If the file has been unlinked, then it must
1221 * now be truncated. Also, we clear all of the read-ahead state
1222 * kept for the inode here since the file is now closed.
1225 xfs_inactive(
1226 xfs_inode_t *ip)
1228 xfs_bmap_free_t free_list;
1229 xfs_fsblock_t first_block;
1230 int committed;
1231 xfs_trans_t *tp;
1232 xfs_mount_t *mp;
1233 int error;
1234 int truncate;
1236 xfs_itrace_entry(ip);
1239 * If the inode is already free, then there can be nothing
1240 * to clean up here.
1242 if (ip->i_d.di_mode == 0 || VN_BAD(VFS_I(ip))) {
1243 ASSERT(ip->i_df.if_real_bytes == 0);
1244 ASSERT(ip->i_df.if_broot_bytes == 0);
1245 return VN_INACTIVE_CACHE;
1249 * Only do a truncate if it's a regular file with
1250 * some actual space in it. It's OK to look at the
1251 * inode's fields without the lock because we're the
1252 * only one with a reference to the inode.
1254 truncate = ((ip->i_d.di_nlink == 0) &&
1255 ((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
1256 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
1257 ((ip->i_d.di_mode & S_IFMT) == S_IFREG));
1259 mp = ip->i_mount;
1261 if (ip->i_d.di_nlink == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_DESTROY))
1262 XFS_SEND_DESTROY(mp, ip, DM_RIGHT_NULL);
1264 error = 0;
1266 /* If this is a read-only mount, don't do this (would generate I/O) */
1267 if (mp->m_flags & XFS_MOUNT_RDONLY)
1268 goto out;
1270 if (ip->i_d.di_nlink != 0) {
1271 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1272 ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 ||
1273 ip->i_delayed_blks > 0)) &&
1274 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
1275 (!(ip->i_d.di_flags &
1276 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
1277 (ip->i_delayed_blks != 0)))) {
1278 error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK);
1279 if (error)
1280 return VN_INACTIVE_CACHE;
1282 goto out;
1285 ASSERT(ip->i_d.di_nlink == 0);
1287 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
1288 return VN_INACTIVE_CACHE;
1290 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1291 if (truncate) {
1293 * Do the xfs_itruncate_start() call before
1294 * reserving any log space because itruncate_start
1295 * will call into the buffer cache and we can't
1296 * do that within a transaction.
1298 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1300 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
1301 if (error) {
1302 xfs_trans_cancel(tp, 0);
1303 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1304 return VN_INACTIVE_CACHE;
1307 error = xfs_trans_reserve(tp, 0,
1308 XFS_ITRUNCATE_LOG_RES(mp),
1309 0, XFS_TRANS_PERM_LOG_RES,
1310 XFS_ITRUNCATE_LOG_COUNT);
1311 if (error) {
1312 /* Don't call itruncate_cleanup */
1313 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1314 xfs_trans_cancel(tp, 0);
1315 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1316 return VN_INACTIVE_CACHE;
1319 xfs_ilock(ip, XFS_ILOCK_EXCL);
1320 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1321 xfs_trans_ihold(tp, ip);
1324 * normally, we have to run xfs_itruncate_finish sync.
1325 * But if filesystem is wsync and we're in the inactive
1326 * path, then we know that nlink == 0, and that the
1327 * xaction that made nlink == 0 is permanently committed
1328 * since xfs_remove runs as a synchronous transaction.
1330 error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK,
1331 (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0));
1333 if (error) {
1334 xfs_trans_cancel(tp,
1335 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1336 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1337 return VN_INACTIVE_CACHE;
1339 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) {
1342 * If we get an error while cleaning up a
1343 * symlink we bail out.
1345 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
1346 xfs_inactive_symlink_rmt(ip, &tp) :
1347 xfs_inactive_symlink_local(ip, &tp);
1349 if (error) {
1350 ASSERT(tp == NULL);
1351 return VN_INACTIVE_CACHE;
1354 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1355 xfs_trans_ihold(tp, ip);
1356 } else {
1357 error = xfs_trans_reserve(tp, 0,
1358 XFS_IFREE_LOG_RES(mp),
1359 0, XFS_TRANS_PERM_LOG_RES,
1360 XFS_INACTIVE_LOG_COUNT);
1361 if (error) {
1362 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1363 xfs_trans_cancel(tp, 0);
1364 return VN_INACTIVE_CACHE;
1367 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1368 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1369 xfs_trans_ihold(tp, ip);
1373 * If there are attributes associated with the file
1374 * then blow them away now. The code calls a routine
1375 * that recursively deconstructs the attribute fork.
1376 * We need to just commit the current transaction
1377 * because we can't use it for xfs_attr_inactive().
1379 if (ip->i_d.di_anextents > 0) {
1380 error = xfs_inactive_attrs(ip, &tp);
1382 * If we got an error, the transaction is already
1383 * cancelled, and the inode is unlocked. Just get out.
1385 if (error)
1386 return VN_INACTIVE_CACHE;
1387 } else if (ip->i_afp) {
1388 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1392 * Free the inode.
1394 XFS_BMAP_INIT(&free_list, &first_block);
1395 error = xfs_ifree(tp, ip, &free_list);
1396 if (error) {
1398 * If we fail to free the inode, shut down. The cancel
1399 * might do that, we need to make sure. Otherwise the
1400 * inode might be lost for a long time or forever.
1402 if (!XFS_FORCED_SHUTDOWN(mp)) {
1403 cmn_err(CE_NOTE,
1404 "xfs_inactive: xfs_ifree() returned an error = %d on %s",
1405 error, mp->m_fsname);
1406 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
1408 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
1409 } else {
1411 * Credit the quota account(s). The inode is gone.
1413 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1416 * Just ignore errors at this point. There is nothing we can
1417 * do except to try to keep going. Make sure it's not a silent
1418 * error.
1420 error = xfs_bmap_finish(&tp, &free_list, &committed);
1421 if (error)
1422 xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: "
1423 "xfs_bmap_finish() returned error %d", error);
1424 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1425 if (error)
1426 xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: "
1427 "xfs_trans_commit() returned error %d", error);
1430 * Release the dquots held by inode, if any.
1432 XFS_QM_DQDETACH(mp, ip);
1434 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1436 out:
1437 return VN_INACTIVE_CACHE;
1441 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
1442 * is allowed, otherwise it has to be an exact match. If a CI match is found,
1443 * ci_name->name will point to a the actual name (caller must free) or
1444 * will be set to NULL if an exact match is found.
1447 xfs_lookup(
1448 xfs_inode_t *dp,
1449 struct xfs_name *name,
1450 xfs_inode_t **ipp,
1451 struct xfs_name *ci_name)
1453 xfs_ino_t inum;
1454 int error;
1455 uint lock_mode;
1457 xfs_itrace_entry(dp);
1459 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
1460 return XFS_ERROR(EIO);
1462 lock_mode = xfs_ilock_map_shared(dp);
1463 error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
1464 xfs_iunlock_map_shared(dp, lock_mode);
1466 if (error)
1467 goto out;
1469 error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp, 0);
1470 if (error)
1471 goto out_free_name;
1473 xfs_itrace_ref(*ipp);
1474 return 0;
1476 out_free_name:
1477 if (ci_name)
1478 kmem_free(ci_name->name);
1479 out:
1480 *ipp = NULL;
1481 return error;
1485 xfs_create(
1486 xfs_inode_t *dp,
1487 struct xfs_name *name,
1488 mode_t mode,
1489 xfs_dev_t rdev,
1490 xfs_inode_t **ipp,
1491 cred_t *credp)
1493 xfs_mount_t *mp = dp->i_mount;
1494 xfs_inode_t *ip;
1495 xfs_trans_t *tp;
1496 int error;
1497 xfs_bmap_free_t free_list;
1498 xfs_fsblock_t first_block;
1499 boolean_t unlock_dp_on_error = B_FALSE;
1500 int dm_event_sent = 0;
1501 uint cancel_flags;
1502 int committed;
1503 xfs_prid_t prid;
1504 struct xfs_dquot *udqp, *gdqp;
1505 uint resblks;
1507 ASSERT(!*ipp);
1508 xfs_itrace_entry(dp);
1510 if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) {
1511 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
1512 dp, DM_RIGHT_NULL, NULL,
1513 DM_RIGHT_NULL, name->name, NULL,
1514 mode, 0, 0);
1516 if (error)
1517 return error;
1518 dm_event_sent = 1;
1521 if (XFS_FORCED_SHUTDOWN(mp))
1522 return XFS_ERROR(EIO);
1524 /* Return through std_return after this point. */
1526 udqp = gdqp = NULL;
1527 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1528 prid = dp->i_d.di_projid;
1529 else
1530 prid = (xfs_prid_t)dfltprid;
1533 * Make sure that we have allocated dquot(s) on disk.
1535 error = XFS_QM_DQVOPALLOC(mp, dp,
1536 current_fsuid(), current_fsgid(), prid,
1537 XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp);
1538 if (error)
1539 goto std_return;
1541 ip = NULL;
1543 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
1544 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1545 resblks = XFS_CREATE_SPACE_RES(mp, name->len);
1547 * Initially assume that the file does not exist and
1548 * reserve the resources for that case. If that is not
1549 * the case we'll drop the one we have and get a more
1550 * appropriate transaction later.
1552 error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0,
1553 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1554 if (error == ENOSPC) {
1555 resblks = 0;
1556 error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0,
1557 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1559 if (error) {
1560 cancel_flags = 0;
1561 goto error_return;
1564 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
1565 unlock_dp_on_error = B_TRUE;
1567 XFS_BMAP_INIT(&free_list, &first_block);
1569 ASSERT(ip == NULL);
1572 * Reserve disk quota and the inode.
1574 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
1575 if (error)
1576 goto error_return;
1578 error = xfs_dir_canenter(tp, dp, name, resblks);
1579 if (error)
1580 goto error_return;
1581 error = xfs_dir_ialloc(&tp, dp, mode, 1,
1582 rdev, credp, prid, resblks > 0,
1583 &ip, &committed);
1584 if (error) {
1585 if (error == ENOSPC)
1586 goto error_return;
1587 goto abort_return;
1589 xfs_itrace_ref(ip);
1592 * At this point, we've gotten a newly allocated inode.
1593 * It is locked (and joined to the transaction).
1596 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
1599 * Now we join the directory inode to the transaction. We do not do it
1600 * earlier because xfs_dir_ialloc might commit the previous transaction
1601 * (and release all the locks). An error from here on will result in
1602 * the transaction cancel unlocking dp so don't do it explicitly in the
1603 * error path.
1605 IHOLD(dp);
1606 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1607 unlock_dp_on_error = B_FALSE;
1609 error = xfs_dir_createname(tp, dp, name, ip->i_ino,
1610 &first_block, &free_list, resblks ?
1611 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
1612 if (error) {
1613 ASSERT(error != ENOSPC);
1614 goto abort_return;
1616 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1617 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1620 * If this is a synchronous mount, make sure that the
1621 * create transaction goes to disk before returning to
1622 * the user.
1624 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1625 xfs_trans_set_sync(tp);
1628 dp->i_gen++;
1631 * Attach the dquot(s) to the inodes and modify them incore.
1632 * These ids of the inode couldn't have changed since the new
1633 * inode has been locked ever since it was created.
1635 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
1638 * xfs_trans_commit normally decrements the vnode ref count
1639 * when it unlocks the inode. Since we want to return the
1640 * vnode to the caller, we bump the vnode ref count now.
1642 IHOLD(ip);
1644 error = xfs_bmap_finish(&tp, &free_list, &committed);
1645 if (error) {
1646 xfs_bmap_cancel(&free_list);
1647 goto abort_rele;
1650 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1651 if (error) {
1652 IRELE(ip);
1653 tp = NULL;
1654 goto error_return;
1657 XFS_QM_DQRELE(mp, udqp);
1658 XFS_QM_DQRELE(mp, gdqp);
1660 *ipp = ip;
1662 /* Fallthrough to std_return with error = 0 */
1664 std_return:
1665 if ((*ipp || (error != 0 && dm_event_sent != 0)) &&
1666 DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) {
1667 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
1668 dp, DM_RIGHT_NULL,
1669 *ipp ? ip : NULL,
1670 DM_RIGHT_NULL, name->name, NULL,
1671 mode, error, 0);
1673 return error;
1675 abort_return:
1676 cancel_flags |= XFS_TRANS_ABORT;
1677 /* FALLTHROUGH */
1679 error_return:
1680 if (tp != NULL)
1681 xfs_trans_cancel(tp, cancel_flags);
1683 XFS_QM_DQRELE(mp, udqp);
1684 XFS_QM_DQRELE(mp, gdqp);
1686 if (unlock_dp_on_error)
1687 xfs_iunlock(dp, XFS_ILOCK_EXCL);
1689 goto std_return;
1691 abort_rele:
1693 * Wait until after the current transaction is aborted to
1694 * release the inode. This prevents recursive transactions
1695 * and deadlocks from xfs_inactive.
1697 cancel_flags |= XFS_TRANS_ABORT;
1698 xfs_trans_cancel(tp, cancel_flags);
1699 IRELE(ip);
1701 XFS_QM_DQRELE(mp, udqp);
1702 XFS_QM_DQRELE(mp, gdqp);
1704 goto std_return;
1707 #ifdef DEBUG
1708 int xfs_locked_n;
1709 int xfs_small_retries;
1710 int xfs_middle_retries;
1711 int xfs_lots_retries;
1712 int xfs_lock_delays;
1713 #endif
1716 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1717 * a different value
1719 static inline int
1720 xfs_lock_inumorder(int lock_mode, int subclass)
1722 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
1723 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
1724 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
1725 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
1727 return lock_mode;
1731 * The following routine will lock n inodes in exclusive mode.
1732 * We assume the caller calls us with the inodes in i_ino order.
1734 * We need to detect deadlock where an inode that we lock
1735 * is in the AIL and we start waiting for another inode that is locked
1736 * by a thread in a long running transaction (such as truncate). This can
1737 * result in deadlock since the long running trans might need to wait
1738 * for the inode we just locked in order to push the tail and free space
1739 * in the log.
1741 void
1742 xfs_lock_inodes(
1743 xfs_inode_t **ips,
1744 int inodes,
1745 uint lock_mode)
1747 int attempts = 0, i, j, try_lock;
1748 xfs_log_item_t *lp;
1750 ASSERT(ips && (inodes >= 2)); /* we need at least two */
1752 try_lock = 0;
1753 i = 0;
1755 again:
1756 for (; i < inodes; i++) {
1757 ASSERT(ips[i]);
1759 if (i && (ips[i] == ips[i-1])) /* Already locked */
1760 continue;
1763 * If try_lock is not set yet, make sure all locked inodes
1764 * are not in the AIL.
1765 * If any are, set try_lock to be used later.
1768 if (!try_lock) {
1769 for (j = (i - 1); j >= 0 && !try_lock; j--) {
1770 lp = (xfs_log_item_t *)ips[j]->i_itemp;
1771 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1772 try_lock++;
1778 * If any of the previous locks we have locked is in the AIL,
1779 * we must TRY to get the second and subsequent locks. If
1780 * we can't get any, we must release all we have
1781 * and try again.
1784 if (try_lock) {
1785 /* try_lock must be 0 if i is 0. */
1787 * try_lock means we have an inode locked
1788 * that is in the AIL.
1790 ASSERT(i != 0);
1791 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
1792 attempts++;
1795 * Unlock all previous guys and try again.
1796 * xfs_iunlock will try to push the tail
1797 * if the inode is in the AIL.
1800 for(j = i - 1; j >= 0; j--) {
1803 * Check to see if we've already
1804 * unlocked this one.
1805 * Not the first one going back,
1806 * and the inode ptr is the same.
1808 if ((j != (i - 1)) && ips[j] ==
1809 ips[j+1])
1810 continue;
1812 xfs_iunlock(ips[j], lock_mode);
1815 if ((attempts % 5) == 0) {
1816 delay(1); /* Don't just spin the CPU */
1817 #ifdef DEBUG
1818 xfs_lock_delays++;
1819 #endif
1821 i = 0;
1822 try_lock = 0;
1823 goto again;
1825 } else {
1826 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
1830 #ifdef DEBUG
1831 if (attempts) {
1832 if (attempts < 5) xfs_small_retries++;
1833 else if (attempts < 100) xfs_middle_retries++;
1834 else xfs_lots_retries++;
1835 } else {
1836 xfs_locked_n++;
1838 #endif
1841 void
1842 xfs_lock_two_inodes(
1843 xfs_inode_t *ip0,
1844 xfs_inode_t *ip1,
1845 uint lock_mode)
1847 xfs_inode_t *temp;
1848 int attempts = 0;
1849 xfs_log_item_t *lp;
1851 ASSERT(ip0->i_ino != ip1->i_ino);
1853 if (ip0->i_ino > ip1->i_ino) {
1854 temp = ip0;
1855 ip0 = ip1;
1856 ip1 = temp;
1859 again:
1860 xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0));
1863 * If the first lock we have locked is in the AIL, we must TRY to get
1864 * the second lock. If we can't get it, we must release the first one
1865 * and try again.
1867 lp = (xfs_log_item_t *)ip0->i_itemp;
1868 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
1869 if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) {
1870 xfs_iunlock(ip0, lock_mode);
1871 if ((++attempts % 5) == 0)
1872 delay(1); /* Don't just spin the CPU */
1873 goto again;
1875 } else {
1876 xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1));
1881 xfs_remove(
1882 xfs_inode_t *dp,
1883 struct xfs_name *name,
1884 xfs_inode_t *ip)
1886 xfs_mount_t *mp = dp->i_mount;
1887 xfs_trans_t *tp = NULL;
1888 int is_dir = S_ISDIR(ip->i_d.di_mode);
1889 int error = 0;
1890 xfs_bmap_free_t free_list;
1891 xfs_fsblock_t first_block;
1892 int cancel_flags;
1893 int committed;
1894 int link_zero;
1895 uint resblks;
1896 uint log_count;
1898 xfs_itrace_entry(dp);
1899 xfs_itrace_entry(ip);
1901 if (XFS_FORCED_SHUTDOWN(mp))
1902 return XFS_ERROR(EIO);
1904 if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) {
1905 error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dp, DM_RIGHT_NULL,
1906 NULL, DM_RIGHT_NULL, name->name, NULL,
1907 ip->i_d.di_mode, 0, 0);
1908 if (error)
1909 return error;
1912 error = XFS_QM_DQATTACH(mp, dp, 0);
1913 if (error)
1914 goto std_return;
1916 error = XFS_QM_DQATTACH(mp, ip, 0);
1917 if (error)
1918 goto std_return;
1920 if (is_dir) {
1921 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
1922 log_count = XFS_DEFAULT_LOG_COUNT;
1923 } else {
1924 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
1925 log_count = XFS_REMOVE_LOG_COUNT;
1927 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1930 * We try to get the real space reservation first,
1931 * allowing for directory btree deletion(s) implying
1932 * possible bmap insert(s). If we can't get the space
1933 * reservation then we use 0 instead, and avoid the bmap
1934 * btree insert(s) in the directory code by, if the bmap
1935 * insert tries to happen, instead trimming the LAST
1936 * block from the directory.
1938 resblks = XFS_REMOVE_SPACE_RES(mp);
1939 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
1940 XFS_TRANS_PERM_LOG_RES, log_count);
1941 if (error == ENOSPC) {
1942 resblks = 0;
1943 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
1944 XFS_TRANS_PERM_LOG_RES, log_count);
1946 if (error) {
1947 ASSERT(error != ENOSPC);
1948 cancel_flags = 0;
1949 goto out_trans_cancel;
1952 xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
1955 * At this point, we've gotten both the directory and the entry
1956 * inodes locked.
1958 IHOLD(ip);
1959 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
1961 IHOLD(dp);
1962 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1965 * If we're removing a directory perform some additional validation.
1967 if (is_dir) {
1968 ASSERT(ip->i_d.di_nlink >= 2);
1969 if (ip->i_d.di_nlink != 2) {
1970 error = XFS_ERROR(ENOTEMPTY);
1971 goto out_trans_cancel;
1973 if (!xfs_dir_isempty(ip)) {
1974 error = XFS_ERROR(ENOTEMPTY);
1975 goto out_trans_cancel;
1979 XFS_BMAP_INIT(&free_list, &first_block);
1980 error = xfs_dir_removename(tp, dp, name, ip->i_ino,
1981 &first_block, &free_list, resblks);
1982 if (error) {
1983 ASSERT(error != ENOENT);
1984 goto out_bmap_cancel;
1986 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1989 * Bump the in memory generation count on the parent
1990 * directory so that other can know that it has changed.
1992 dp->i_gen++;
1993 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1995 if (is_dir) {
1997 * Drop the link from ip's "..".
1999 error = xfs_droplink(tp, dp);
2000 if (error)
2001 goto out_bmap_cancel;
2004 * Drop the link from dp to ip.
2006 error = xfs_droplink(tp, ip);
2007 if (error)
2008 goto out_bmap_cancel;
2009 } else {
2011 * When removing a non-directory we need to log the parent
2012 * inode here for the i_gen update. For a directory this is
2013 * done implicitly by the xfs_droplink call for the ".." entry.
2015 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2019 * Drop the "." link from ip to self.
2021 error = xfs_droplink(tp, ip);
2022 if (error)
2023 goto out_bmap_cancel;
2026 * Determine if this is the last link while
2027 * we are in the transaction.
2029 link_zero = (ip->i_d.di_nlink == 0);
2032 * If this is a synchronous mount, make sure that the
2033 * remove transaction goes to disk before returning to
2034 * the user.
2036 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC))
2037 xfs_trans_set_sync(tp);
2039 error = xfs_bmap_finish(&tp, &free_list, &committed);
2040 if (error)
2041 goto out_bmap_cancel;
2043 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2044 if (error)
2045 goto std_return;
2048 * If we are using filestreams, kill the stream association.
2049 * If the file is still open it may get a new one but that
2050 * will get killed on last close in xfs_close() so we don't
2051 * have to worry about that.
2053 if (!is_dir && link_zero && xfs_inode_is_filestream(ip))
2054 xfs_filestream_deassociate(ip);
2056 xfs_itrace_exit(ip);
2057 xfs_itrace_exit(dp);
2059 std_return:
2060 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) {
2061 XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, dp, DM_RIGHT_NULL,
2062 NULL, DM_RIGHT_NULL, name->name, NULL,
2063 ip->i_d.di_mode, error, 0);
2066 return error;
2068 out_bmap_cancel:
2069 xfs_bmap_cancel(&free_list);
2070 cancel_flags |= XFS_TRANS_ABORT;
2071 out_trans_cancel:
2072 xfs_trans_cancel(tp, cancel_flags);
2073 goto std_return;
2077 xfs_link(
2078 xfs_inode_t *tdp,
2079 xfs_inode_t *sip,
2080 struct xfs_name *target_name)
2082 xfs_mount_t *mp = tdp->i_mount;
2083 xfs_trans_t *tp;
2084 int error;
2085 xfs_bmap_free_t free_list;
2086 xfs_fsblock_t first_block;
2087 int cancel_flags;
2088 int committed;
2089 int resblks;
2091 xfs_itrace_entry(tdp);
2092 xfs_itrace_entry(sip);
2094 ASSERT(!S_ISDIR(sip->i_d.di_mode));
2096 if (XFS_FORCED_SHUTDOWN(mp))
2097 return XFS_ERROR(EIO);
2099 if (DM_EVENT_ENABLED(tdp, DM_EVENT_LINK)) {
2100 error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK,
2101 tdp, DM_RIGHT_NULL,
2102 sip, DM_RIGHT_NULL,
2103 target_name->name, NULL, 0, 0, 0);
2104 if (error)
2105 return error;
2108 /* Return through std_return after this point. */
2110 error = XFS_QM_DQATTACH(mp, sip, 0);
2111 if (!error && sip != tdp)
2112 error = XFS_QM_DQATTACH(mp, tdp, 0);
2113 if (error)
2114 goto std_return;
2116 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
2117 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2118 resblks = XFS_LINK_SPACE_RES(mp, target_name->len);
2119 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
2120 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2121 if (error == ENOSPC) {
2122 resblks = 0;
2123 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
2124 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2126 if (error) {
2127 cancel_flags = 0;
2128 goto error_return;
2131 xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
2134 * Increment vnode ref counts since xfs_trans_commit &
2135 * xfs_trans_cancel will both unlock the inodes and
2136 * decrement the associated ref counts.
2138 IHOLD(sip);
2139 IHOLD(tdp);
2140 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
2141 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
2144 * If the source has too many links, we can't make any more to it.
2146 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
2147 error = XFS_ERROR(EMLINK);
2148 goto error_return;
2152 * If we are using project inheritance, we only allow hard link
2153 * creation in our tree when the project IDs are the same; else
2154 * the tree quota mechanism could be circumvented.
2156 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
2157 (tdp->i_d.di_projid != sip->i_d.di_projid))) {
2158 error = XFS_ERROR(EXDEV);
2159 goto error_return;
2162 error = xfs_dir_canenter(tp, tdp, target_name, resblks);
2163 if (error)
2164 goto error_return;
2166 XFS_BMAP_INIT(&free_list, &first_block);
2168 error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino,
2169 &first_block, &free_list, resblks);
2170 if (error)
2171 goto abort_return;
2172 xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2173 tdp->i_gen++;
2174 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
2176 error = xfs_bumplink(tp, sip);
2177 if (error)
2178 goto abort_return;
2181 * If this is a synchronous mount, make sure that the
2182 * link transaction goes to disk before returning to
2183 * the user.
2185 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2186 xfs_trans_set_sync(tp);
2189 error = xfs_bmap_finish (&tp, &free_list, &committed);
2190 if (error) {
2191 xfs_bmap_cancel(&free_list);
2192 goto abort_return;
2195 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2196 if (error)
2197 goto std_return;
2199 /* Fall through to std_return with error = 0. */
2200 std_return:
2201 if (DM_EVENT_ENABLED(sip, DM_EVENT_POSTLINK)) {
2202 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK,
2203 tdp, DM_RIGHT_NULL,
2204 sip, DM_RIGHT_NULL,
2205 target_name->name, NULL, 0, error, 0);
2207 return error;
2209 abort_return:
2210 cancel_flags |= XFS_TRANS_ABORT;
2211 /* FALLTHROUGH */
2213 error_return:
2214 xfs_trans_cancel(tp, cancel_flags);
2215 goto std_return;
2220 xfs_mkdir(
2221 xfs_inode_t *dp,
2222 struct xfs_name *dir_name,
2223 mode_t mode,
2224 xfs_inode_t **ipp,
2225 cred_t *credp)
2227 xfs_mount_t *mp = dp->i_mount;
2228 xfs_inode_t *cdp; /* inode of created dir */
2229 xfs_trans_t *tp;
2230 int cancel_flags;
2231 int error;
2232 int committed;
2233 xfs_bmap_free_t free_list;
2234 xfs_fsblock_t first_block;
2235 boolean_t unlock_dp_on_error = B_FALSE;
2236 boolean_t created = B_FALSE;
2237 int dm_event_sent = 0;
2238 xfs_prid_t prid;
2239 struct xfs_dquot *udqp, *gdqp;
2240 uint resblks;
2242 if (XFS_FORCED_SHUTDOWN(mp))
2243 return XFS_ERROR(EIO);
2245 tp = NULL;
2247 if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) {
2248 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
2249 dp, DM_RIGHT_NULL, NULL,
2250 DM_RIGHT_NULL, dir_name->name, NULL,
2251 mode, 0, 0);
2252 if (error)
2253 return error;
2254 dm_event_sent = 1;
2257 /* Return through std_return after this point. */
2259 xfs_itrace_entry(dp);
2261 mp = dp->i_mount;
2262 udqp = gdqp = NULL;
2263 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
2264 prid = dp->i_d.di_projid;
2265 else
2266 prid = (xfs_prid_t)dfltprid;
2269 * Make sure that we have allocated dquot(s) on disk.
2271 error = XFS_QM_DQVOPALLOC(mp, dp,
2272 current_fsuid(), current_fsgid(), prid,
2273 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
2274 if (error)
2275 goto std_return;
2277 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
2278 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2279 resblks = XFS_MKDIR_SPACE_RES(mp, dir_name->len);
2280 error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0,
2281 XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT);
2282 if (error == ENOSPC) {
2283 resblks = 0;
2284 error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0,
2285 XFS_TRANS_PERM_LOG_RES,
2286 XFS_MKDIR_LOG_COUNT);
2288 if (error) {
2289 cancel_flags = 0;
2290 goto error_return;
2293 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
2294 unlock_dp_on_error = B_TRUE;
2297 * Check for directory link count overflow.
2299 if (dp->i_d.di_nlink >= XFS_MAXLINK) {
2300 error = XFS_ERROR(EMLINK);
2301 goto error_return;
2305 * Reserve disk quota and the inode.
2307 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
2308 if (error)
2309 goto error_return;
2311 error = xfs_dir_canenter(tp, dp, dir_name, resblks);
2312 if (error)
2313 goto error_return;
2315 * create the directory inode.
2317 error = xfs_dir_ialloc(&tp, dp, mode, 2,
2318 0, credp, prid, resblks > 0,
2319 &cdp, NULL);
2320 if (error) {
2321 if (error == ENOSPC)
2322 goto error_return;
2323 goto abort_return;
2325 xfs_itrace_ref(cdp);
2328 * Now we add the directory inode to the transaction.
2329 * We waited until now since xfs_dir_ialloc might start
2330 * a new transaction. Had we joined the transaction
2331 * earlier, the locks might have gotten released. An error
2332 * from here on will result in the transaction cancel
2333 * unlocking dp so don't do it explicitly in the error path.
2335 IHOLD(dp);
2336 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2337 unlock_dp_on_error = B_FALSE;
2339 XFS_BMAP_INIT(&free_list, &first_block);
2341 error = xfs_dir_createname(tp, dp, dir_name, cdp->i_ino,
2342 &first_block, &free_list, resblks ?
2343 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
2344 if (error) {
2345 ASSERT(error != ENOSPC);
2346 goto error1;
2348 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2351 * Bump the in memory version number of the parent directory
2352 * so that other processes accessing it will recognize that
2353 * the directory has changed.
2355 dp->i_gen++;
2357 error = xfs_dir_init(tp, cdp, dp);
2358 if (error)
2359 goto error2;
2361 cdp->i_gen = 1;
2362 error = xfs_bumplink(tp, dp);
2363 if (error)
2364 goto error2;
2366 created = B_TRUE;
2368 *ipp = cdp;
2369 IHOLD(cdp);
2372 * Attach the dquots to the new inode and modify the icount incore.
2374 XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp);
2377 * If this is a synchronous mount, make sure that the
2378 * mkdir transaction goes to disk before returning to
2379 * the user.
2381 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2382 xfs_trans_set_sync(tp);
2385 error = xfs_bmap_finish(&tp, &free_list, &committed);
2386 if (error) {
2387 IRELE(cdp);
2388 goto error2;
2391 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2392 XFS_QM_DQRELE(mp, udqp);
2393 XFS_QM_DQRELE(mp, gdqp);
2394 if (error) {
2395 IRELE(cdp);
2398 /* Fall through to std_return with error = 0 or errno from
2399 * xfs_trans_commit. */
2401 std_return:
2402 if ((created || (error != 0 && dm_event_sent != 0)) &&
2403 DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) {
2404 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
2405 dp, DM_RIGHT_NULL,
2406 created ? cdp : NULL,
2407 DM_RIGHT_NULL,
2408 dir_name->name, NULL,
2409 mode, error, 0);
2411 return error;
2413 error2:
2414 error1:
2415 xfs_bmap_cancel(&free_list);
2416 abort_return:
2417 cancel_flags |= XFS_TRANS_ABORT;
2418 error_return:
2419 xfs_trans_cancel(tp, cancel_flags);
2420 XFS_QM_DQRELE(mp, udqp);
2421 XFS_QM_DQRELE(mp, gdqp);
2423 if (unlock_dp_on_error)
2424 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2426 goto std_return;
2430 xfs_symlink(
2431 xfs_inode_t *dp,
2432 struct xfs_name *link_name,
2433 const char *target_path,
2434 mode_t mode,
2435 xfs_inode_t **ipp,
2436 cred_t *credp)
2438 xfs_mount_t *mp = dp->i_mount;
2439 xfs_trans_t *tp;
2440 xfs_inode_t *ip;
2441 int error;
2442 int pathlen;
2443 xfs_bmap_free_t free_list;
2444 xfs_fsblock_t first_block;
2445 boolean_t unlock_dp_on_error = B_FALSE;
2446 uint cancel_flags;
2447 int committed;
2448 xfs_fileoff_t first_fsb;
2449 xfs_filblks_t fs_blocks;
2450 int nmaps;
2451 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
2452 xfs_daddr_t d;
2453 const char *cur_chunk;
2454 int byte_cnt;
2455 int n;
2456 xfs_buf_t *bp;
2457 xfs_prid_t prid;
2458 struct xfs_dquot *udqp, *gdqp;
2459 uint resblks;
2461 *ipp = NULL;
2462 error = 0;
2463 ip = NULL;
2464 tp = NULL;
2466 xfs_itrace_entry(dp);
2468 if (XFS_FORCED_SHUTDOWN(mp))
2469 return XFS_ERROR(EIO);
2472 * Check component lengths of the target path name.
2474 pathlen = strlen(target_path);
2475 if (pathlen >= MAXPATHLEN) /* total string too long */
2476 return XFS_ERROR(ENAMETOOLONG);
2478 if (DM_EVENT_ENABLED(dp, DM_EVENT_SYMLINK)) {
2479 error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dp,
2480 DM_RIGHT_NULL, NULL, DM_RIGHT_NULL,
2481 link_name->name, target_path, 0, 0, 0);
2482 if (error)
2483 return error;
2486 /* Return through std_return after this point. */
2488 udqp = gdqp = NULL;
2489 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
2490 prid = dp->i_d.di_projid;
2491 else
2492 prid = (xfs_prid_t)dfltprid;
2495 * Make sure that we have allocated dquot(s) on disk.
2497 error = XFS_QM_DQVOPALLOC(mp, dp,
2498 current_fsuid(), current_fsgid(), prid,
2499 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
2500 if (error)
2501 goto std_return;
2503 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
2504 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2506 * The symlink will fit into the inode data fork?
2507 * There can't be any attributes so we get the whole variable part.
2509 if (pathlen <= XFS_LITINO(mp))
2510 fs_blocks = 0;
2511 else
2512 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
2513 resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
2514 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
2515 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
2516 if (error == ENOSPC && fs_blocks == 0) {
2517 resblks = 0;
2518 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
2519 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
2521 if (error) {
2522 cancel_flags = 0;
2523 goto error_return;
2526 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
2527 unlock_dp_on_error = B_TRUE;
2530 * Check whether the directory allows new symlinks or not.
2532 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
2533 error = XFS_ERROR(EPERM);
2534 goto error_return;
2538 * Reserve disk quota : blocks and inode.
2540 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
2541 if (error)
2542 goto error_return;
2545 * Check for ability to enter directory entry, if no space reserved.
2547 error = xfs_dir_canenter(tp, dp, link_name, resblks);
2548 if (error)
2549 goto error_return;
2551 * Initialize the bmap freelist prior to calling either
2552 * bmapi or the directory create code.
2554 XFS_BMAP_INIT(&free_list, &first_block);
2557 * Allocate an inode for the symlink.
2559 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT),
2560 1, 0, credp, prid, resblks > 0, &ip, NULL);
2561 if (error) {
2562 if (error == ENOSPC)
2563 goto error_return;
2564 goto error1;
2566 xfs_itrace_ref(ip);
2569 * An error after we've joined dp to the transaction will result in the
2570 * transaction cancel unlocking dp so don't do it explicitly in the
2571 * error path.
2573 IHOLD(dp);
2574 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2575 unlock_dp_on_error = B_FALSE;
2578 * Also attach the dquot(s) to it, if applicable.
2580 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
2582 if (resblks)
2583 resblks -= XFS_IALLOC_SPACE_RES(mp);
2585 * If the symlink will fit into the inode, write it inline.
2587 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
2588 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
2589 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
2590 ip->i_d.di_size = pathlen;
2593 * The inode was initially created in extent format.
2595 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
2596 ip->i_df.if_flags |= XFS_IFINLINE;
2598 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
2599 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
2601 } else {
2602 first_fsb = 0;
2603 nmaps = SYMLINK_MAPS;
2605 error = xfs_bmapi(tp, ip, first_fsb, fs_blocks,
2606 XFS_BMAPI_WRITE | XFS_BMAPI_METADATA,
2607 &first_block, resblks, mval, &nmaps,
2608 &free_list, NULL);
2609 if (error) {
2610 goto error1;
2613 if (resblks)
2614 resblks -= fs_blocks;
2615 ip->i_d.di_size = pathlen;
2616 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2618 cur_chunk = target_path;
2619 for (n = 0; n < nmaps; n++) {
2620 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
2621 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
2622 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
2623 BTOBB(byte_cnt), 0);
2624 ASSERT(bp && !XFS_BUF_GETERROR(bp));
2625 if (pathlen < byte_cnt) {
2626 byte_cnt = pathlen;
2628 pathlen -= byte_cnt;
2630 memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt);
2631 cur_chunk += byte_cnt;
2633 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
2638 * Create the directory entry for the symlink.
2640 error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
2641 &first_block, &free_list, resblks);
2642 if (error)
2643 goto error1;
2644 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2645 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2648 * Bump the in memory version number of the parent directory
2649 * so that other processes accessing it will recognize that
2650 * the directory has changed.
2652 dp->i_gen++;
2655 * If this is a synchronous mount, make sure that the
2656 * symlink transaction goes to disk before returning to
2657 * the user.
2659 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2660 xfs_trans_set_sync(tp);
2664 * xfs_trans_commit normally decrements the vnode ref count
2665 * when it unlocks the inode. Since we want to return the
2666 * vnode to the caller, we bump the vnode ref count now.
2668 IHOLD(ip);
2670 error = xfs_bmap_finish(&tp, &free_list, &committed);
2671 if (error) {
2672 goto error2;
2674 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
2675 XFS_QM_DQRELE(mp, udqp);
2676 XFS_QM_DQRELE(mp, gdqp);
2678 /* Fall through to std_return with error = 0 or errno from
2679 * xfs_trans_commit */
2680 std_return:
2681 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTSYMLINK)) {
2682 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK,
2683 dp, DM_RIGHT_NULL,
2684 error ? NULL : ip,
2685 DM_RIGHT_NULL, link_name->name,
2686 target_path, 0, error, 0);
2689 if (!error)
2690 *ipp = ip;
2691 return error;
2693 error2:
2694 IRELE(ip);
2695 error1:
2696 xfs_bmap_cancel(&free_list);
2697 cancel_flags |= XFS_TRANS_ABORT;
2698 error_return:
2699 xfs_trans_cancel(tp, cancel_flags);
2700 XFS_QM_DQRELE(mp, udqp);
2701 XFS_QM_DQRELE(mp, gdqp);
2703 if (unlock_dp_on_error)
2704 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2706 goto std_return;
2710 xfs_inode_flush(
2711 xfs_inode_t *ip,
2712 int flags)
2714 xfs_mount_t *mp = ip->i_mount;
2715 int error = 0;
2717 if (XFS_FORCED_SHUTDOWN(mp))
2718 return XFS_ERROR(EIO);
2721 * Bypass inodes which have already been cleaned by
2722 * the inode flush clustering code inside xfs_iflush
2724 if (xfs_inode_clean(ip))
2725 return 0;
2728 * We make this non-blocking if the inode is contended,
2729 * return EAGAIN to indicate to the caller that they
2730 * did not succeed. This prevents the flush path from
2731 * blocking on inodes inside another operation right
2732 * now, they get caught later by xfs_sync.
2734 if (flags & FLUSH_SYNC) {
2735 xfs_ilock(ip, XFS_ILOCK_SHARED);
2736 xfs_iflock(ip);
2737 } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
2738 if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) {
2739 xfs_iunlock(ip, XFS_ILOCK_SHARED);
2740 return EAGAIN;
2742 } else {
2743 return EAGAIN;
2746 error = xfs_iflush(ip, (flags & FLUSH_SYNC) ? XFS_IFLUSH_SYNC
2747 : XFS_IFLUSH_ASYNC_NOBLOCK);
2748 xfs_iunlock(ip, XFS_ILOCK_SHARED);
2750 return error;
2755 xfs_set_dmattrs(
2756 xfs_inode_t *ip,
2757 u_int evmask,
2758 u_int16_t state)
2760 xfs_mount_t *mp = ip->i_mount;
2761 xfs_trans_t *tp;
2762 int error;
2764 if (!capable(CAP_SYS_ADMIN))
2765 return XFS_ERROR(EPERM);
2767 if (XFS_FORCED_SHUTDOWN(mp))
2768 return XFS_ERROR(EIO);
2770 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
2771 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
2772 if (error) {
2773 xfs_trans_cancel(tp, 0);
2774 return error;
2776 xfs_ilock(ip, XFS_ILOCK_EXCL);
2777 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2779 ip->i_d.di_dmevmask = evmask;
2780 ip->i_d.di_dmstate = state;
2782 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2783 IHOLD(ip);
2784 error = xfs_trans_commit(tp, 0);
2786 return error;
2790 xfs_reclaim(
2791 xfs_inode_t *ip)
2794 xfs_itrace_entry(ip);
2796 ASSERT(!VN_MAPPED(VFS_I(ip)));
2798 /* bad inode, get out here ASAP */
2799 if (VN_BAD(VFS_I(ip))) {
2800 xfs_ireclaim(ip);
2801 return 0;
2804 vn_iowait(ip);
2806 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
2809 * Make sure the atime in the XFS inode is correct before freeing the
2810 * Linux inode.
2812 xfs_synchronize_atime(ip);
2815 * If we have nothing to flush with this inode then complete the
2816 * teardown now, otherwise break the link between the xfs inode and the
2817 * linux inode and clean up the xfs inode later. This avoids flushing
2818 * the inode to disk during the delete operation itself.
2820 * When breaking the link, we need to set the XFS_IRECLAIMABLE flag
2821 * first to ensure that xfs_iunpin() will never see an xfs inode
2822 * that has a linux inode being reclaimed. Synchronisation is provided
2823 * by the i_flags_lock.
2825 if (!ip->i_update_core && (ip->i_itemp == NULL)) {
2826 xfs_ilock(ip, XFS_ILOCK_EXCL);
2827 xfs_iflock(ip);
2828 return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC);
2829 } else {
2830 xfs_mount_t *mp = ip->i_mount;
2832 /* Protect sync and unpin from us */
2833 XFS_MOUNT_ILOCK(mp);
2834 spin_lock(&ip->i_flags_lock);
2835 __xfs_iflags_set(ip, XFS_IRECLAIMABLE);
2836 VFS_I(ip)->i_private = NULL;
2837 ip->i_vnode = NULL;
2838 spin_unlock(&ip->i_flags_lock);
2839 list_add_tail(&ip->i_reclaim, &mp->m_del_inodes);
2840 XFS_MOUNT_IUNLOCK(mp);
2842 return 0;
2846 xfs_finish_reclaim(
2847 xfs_inode_t *ip,
2848 int locked,
2849 int sync_mode)
2851 xfs_perag_t *pag = xfs_get_perag(ip->i_mount, ip->i_ino);
2852 struct inode *vp = VFS_I(ip);
2854 if (vp && VN_BAD(vp))
2855 goto reclaim;
2857 /* The hash lock here protects a thread in xfs_iget_core from
2858 * racing with us on linking the inode back with a vnode.
2859 * Once we have the XFS_IRECLAIM flag set it will not touch
2860 * us.
2862 write_lock(&pag->pag_ici_lock);
2863 spin_lock(&ip->i_flags_lock);
2864 if (__xfs_iflags_test(ip, XFS_IRECLAIM) ||
2865 (!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) && vp == NULL)) {
2866 spin_unlock(&ip->i_flags_lock);
2867 write_unlock(&pag->pag_ici_lock);
2868 if (locked) {
2869 xfs_ifunlock(ip);
2870 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2872 return 1;
2874 __xfs_iflags_set(ip, XFS_IRECLAIM);
2875 spin_unlock(&ip->i_flags_lock);
2876 write_unlock(&pag->pag_ici_lock);
2877 xfs_put_perag(ip->i_mount, pag);
2880 * If the inode is still dirty, then flush it out. If the inode
2881 * is not in the AIL, then it will be OK to flush it delwri as
2882 * long as xfs_iflush() does not keep any references to the inode.
2883 * We leave that decision up to xfs_iflush() since it has the
2884 * knowledge of whether it's OK to simply do a delwri flush of
2885 * the inode or whether we need to wait until the inode is
2886 * pulled from the AIL.
2887 * We get the flush lock regardless, though, just to make sure
2888 * we don't free it while it is being flushed.
2890 if (!locked) {
2891 xfs_ilock(ip, XFS_ILOCK_EXCL);
2892 xfs_iflock(ip);
2896 * In the case of a forced shutdown we rely on xfs_iflush() to
2897 * wait for the inode to be unpinned before returning an error.
2899 if (xfs_iflush(ip, sync_mode) == 0) {
2900 /* synchronize with xfs_iflush_done */
2901 xfs_iflock(ip);
2902 xfs_ifunlock(ip);
2905 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2907 reclaim:
2908 xfs_ireclaim(ip);
2909 return 0;
2913 xfs_finish_reclaim_all(xfs_mount_t *mp, int noblock)
2915 int purged;
2916 xfs_inode_t *ip, *n;
2917 int done = 0;
2919 while (!done) {
2920 purged = 0;
2921 XFS_MOUNT_ILOCK(mp);
2922 list_for_each_entry_safe(ip, n, &mp->m_del_inodes, i_reclaim) {
2923 if (noblock) {
2924 if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0)
2925 continue;
2926 if (xfs_ipincount(ip) ||
2927 !xfs_iflock_nowait(ip)) {
2928 xfs_iunlock(ip, XFS_ILOCK_EXCL);
2929 continue;
2932 XFS_MOUNT_IUNLOCK(mp);
2933 if (xfs_finish_reclaim(ip, noblock,
2934 XFS_IFLUSH_DELWRI_ELSE_ASYNC))
2935 delay(1);
2936 purged = 1;
2937 break;
2940 done = !purged;
2943 XFS_MOUNT_IUNLOCK(mp);
2944 return 0;
2948 * xfs_alloc_file_space()
2949 * This routine allocates disk space for the given file.
2951 * If alloc_type == 0, this request is for an ALLOCSP type
2952 * request which will change the file size. In this case, no
2953 * DMAPI event will be generated by the call. A TRUNCATE event
2954 * will be generated later by xfs_setattr.
2956 * If alloc_type != 0, this request is for a RESVSP type
2957 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
2958 * lower block boundary byte address is less than the file's
2959 * length.
2961 * RETURNS:
2962 * 0 on success
2963 * errno on error
2966 STATIC int
2967 xfs_alloc_file_space(
2968 xfs_inode_t *ip,
2969 xfs_off_t offset,
2970 xfs_off_t len,
2971 int alloc_type,
2972 int attr_flags)
2974 xfs_mount_t *mp = ip->i_mount;
2975 xfs_off_t count;
2976 xfs_filblks_t allocated_fsb;
2977 xfs_filblks_t allocatesize_fsb;
2978 xfs_extlen_t extsz, temp;
2979 xfs_fileoff_t startoffset_fsb;
2980 xfs_fsblock_t firstfsb;
2981 int nimaps;
2982 int bmapi_flag;
2983 int quota_flag;
2984 int rt;
2985 xfs_trans_t *tp;
2986 xfs_bmbt_irec_t imaps[1], *imapp;
2987 xfs_bmap_free_t free_list;
2988 uint qblocks, resblks, resrtextents;
2989 int committed;
2990 int error;
2992 xfs_itrace_entry(ip);
2994 if (XFS_FORCED_SHUTDOWN(mp))
2995 return XFS_ERROR(EIO);
2997 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
2998 return error;
3000 if (len <= 0)
3001 return XFS_ERROR(EINVAL);
3003 rt = XFS_IS_REALTIME_INODE(ip);
3004 extsz = xfs_get_extsz_hint(ip);
3006 count = len;
3007 imapp = &imaps[0];
3008 nimaps = 1;
3009 bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0);
3010 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
3011 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
3013 /* Generate a DMAPI event if needed. */
3014 if (alloc_type != 0 && offset < ip->i_size &&
3015 (attr_flags & XFS_ATTR_DMI) == 0 &&
3016 DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) {
3017 xfs_off_t end_dmi_offset;
3019 end_dmi_offset = offset+len;
3020 if (end_dmi_offset > ip->i_size)
3021 end_dmi_offset = ip->i_size;
3022 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, offset,
3023 end_dmi_offset - offset, 0, NULL);
3024 if (error)
3025 return error;
3029 * Allocate file space until done or until there is an error
3031 retry:
3032 while (allocatesize_fsb && !error) {
3033 xfs_fileoff_t s, e;
3036 * Determine space reservations for data/realtime.
3038 if (unlikely(extsz)) {
3039 s = startoffset_fsb;
3040 do_div(s, extsz);
3041 s *= extsz;
3042 e = startoffset_fsb + allocatesize_fsb;
3043 if ((temp = do_mod(startoffset_fsb, extsz)))
3044 e += temp;
3045 if ((temp = do_mod(e, extsz)))
3046 e += extsz - temp;
3047 } else {
3048 s = 0;
3049 e = allocatesize_fsb;
3052 if (unlikely(rt)) {
3053 resrtextents = qblocks = (uint)(e - s);
3054 resrtextents /= mp->m_sb.sb_rextsize;
3055 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
3056 quota_flag = XFS_QMOPT_RES_RTBLKS;
3057 } else {
3058 resrtextents = 0;
3059 resblks = qblocks = \
3060 XFS_DIOSTRAT_SPACE_RES(mp, (uint)(e - s));
3061 quota_flag = XFS_QMOPT_RES_REGBLKS;
3065 * Allocate and setup the transaction.
3067 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
3068 error = xfs_trans_reserve(tp, resblks,
3069 XFS_WRITE_LOG_RES(mp), resrtextents,
3070 XFS_TRANS_PERM_LOG_RES,
3071 XFS_WRITE_LOG_COUNT);
3073 * Check for running out of space
3075 if (error) {
3077 * Free the transaction structure.
3079 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
3080 xfs_trans_cancel(tp, 0);
3081 break;
3083 xfs_ilock(ip, XFS_ILOCK_EXCL);
3084 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
3085 qblocks, 0, quota_flag);
3086 if (error)
3087 goto error1;
3089 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3090 xfs_trans_ihold(tp, ip);
3093 * Issue the xfs_bmapi() call to allocate the blocks
3095 XFS_BMAP_INIT(&free_list, &firstfsb);
3096 error = xfs_bmapi(tp, ip, startoffset_fsb,
3097 allocatesize_fsb, bmapi_flag,
3098 &firstfsb, 0, imapp, &nimaps,
3099 &free_list, NULL);
3100 if (error) {
3101 goto error0;
3105 * Complete the transaction
3107 error = xfs_bmap_finish(&tp, &free_list, &committed);
3108 if (error) {
3109 goto error0;
3112 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3113 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3114 if (error) {
3115 break;
3118 allocated_fsb = imapp->br_blockcount;
3120 if (nimaps == 0) {
3121 error = XFS_ERROR(ENOSPC);
3122 break;
3125 startoffset_fsb += allocated_fsb;
3126 allocatesize_fsb -= allocated_fsb;
3128 dmapi_enospc_check:
3129 if (error == ENOSPC && (attr_flags & XFS_ATTR_DMI) == 0 &&
3130 DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE)) {
3131 error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE,
3132 ip, DM_RIGHT_NULL,
3133 ip, DM_RIGHT_NULL,
3134 NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */
3135 if (error == 0)
3136 goto retry; /* Maybe DMAPI app. has made space */
3137 /* else fall through with error from XFS_SEND_DATA */
3140 return error;
3142 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
3143 xfs_bmap_cancel(&free_list);
3144 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
3146 error1: /* Just cancel transaction */
3147 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
3148 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3149 goto dmapi_enospc_check;
3153 * Zero file bytes between startoff and endoff inclusive.
3154 * The iolock is held exclusive and no blocks are buffered.
3156 STATIC int
3157 xfs_zero_remaining_bytes(
3158 xfs_inode_t *ip,
3159 xfs_off_t startoff,
3160 xfs_off_t endoff)
3162 xfs_bmbt_irec_t imap;
3163 xfs_fileoff_t offset_fsb;
3164 xfs_off_t lastoffset;
3165 xfs_off_t offset;
3166 xfs_buf_t *bp;
3167 xfs_mount_t *mp = ip->i_mount;
3168 int nimap;
3169 int error = 0;
3171 bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
3172 XFS_IS_REALTIME_INODE(ip) ?
3173 mp->m_rtdev_targp : mp->m_ddev_targp);
3175 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
3176 offset_fsb = XFS_B_TO_FSBT(mp, offset);
3177 nimap = 1;
3178 error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0,
3179 NULL, 0, &imap, &nimap, NULL, NULL);
3180 if (error || nimap < 1)
3181 break;
3182 ASSERT(imap.br_blockcount >= 1);
3183 ASSERT(imap.br_startoff == offset_fsb);
3184 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
3185 if (lastoffset > endoff)
3186 lastoffset = endoff;
3187 if (imap.br_startblock == HOLESTARTBLOCK)
3188 continue;
3189 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
3190 if (imap.br_state == XFS_EXT_UNWRITTEN)
3191 continue;
3192 XFS_BUF_UNDONE(bp);
3193 XFS_BUF_UNWRITE(bp);
3194 XFS_BUF_READ(bp);
3195 XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock));
3196 xfsbdstrat(mp, bp);
3197 error = xfs_iowait(bp);
3198 if (error) {
3199 xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
3200 mp, bp, XFS_BUF_ADDR(bp));
3201 break;
3203 memset(XFS_BUF_PTR(bp) +
3204 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
3205 0, lastoffset - offset + 1);
3206 XFS_BUF_UNDONE(bp);
3207 XFS_BUF_UNREAD(bp);
3208 XFS_BUF_WRITE(bp);
3209 xfsbdstrat(mp, bp);
3210 error = xfs_iowait(bp);
3211 if (error) {
3212 xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
3213 mp, bp, XFS_BUF_ADDR(bp));
3214 break;
3217 xfs_buf_free(bp);
3218 return error;
3222 * xfs_free_file_space()
3223 * This routine frees disk space for the given file.
3225 * This routine is only called by xfs_change_file_space
3226 * for an UNRESVSP type call.
3228 * RETURNS:
3229 * 0 on success
3230 * errno on error
3233 STATIC int
3234 xfs_free_file_space(
3235 xfs_inode_t *ip,
3236 xfs_off_t offset,
3237 xfs_off_t len,
3238 int attr_flags)
3240 int committed;
3241 int done;
3242 xfs_off_t end_dmi_offset;
3243 xfs_fileoff_t endoffset_fsb;
3244 int error;
3245 xfs_fsblock_t firstfsb;
3246 xfs_bmap_free_t free_list;
3247 xfs_bmbt_irec_t imap;
3248 xfs_off_t ioffset;
3249 xfs_extlen_t mod=0;
3250 xfs_mount_t *mp;
3251 int nimap;
3252 uint resblks;
3253 uint rounding;
3254 int rt;
3255 xfs_fileoff_t startoffset_fsb;
3256 xfs_trans_t *tp;
3257 int need_iolock = 1;
3259 mp = ip->i_mount;
3261 xfs_itrace_entry(ip);
3263 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
3264 return error;
3266 error = 0;
3267 if (len <= 0) /* if nothing being freed */
3268 return error;
3269 rt = XFS_IS_REALTIME_INODE(ip);
3270 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
3271 end_dmi_offset = offset + len;
3272 endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset);
3274 if (offset < ip->i_size && (attr_flags & XFS_ATTR_DMI) == 0 &&
3275 DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) {
3276 if (end_dmi_offset > ip->i_size)
3277 end_dmi_offset = ip->i_size;
3278 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip,
3279 offset, end_dmi_offset - offset,
3280 AT_DELAY_FLAG(attr_flags), NULL);
3281 if (error)
3282 return error;
3285 if (attr_flags & XFS_ATTR_NOLOCK)
3286 need_iolock = 0;
3287 if (need_iolock) {
3288 xfs_ilock(ip, XFS_IOLOCK_EXCL);
3289 vn_iowait(ip); /* wait for the completion of any pending DIOs */
3292 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
3293 ioffset = offset & ~(rounding - 1);
3295 if (VN_CACHED(VFS_I(ip)) != 0) {
3296 xfs_inval_cached_trace(ip, ioffset, -1, ioffset, -1);
3297 error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED);
3298 if (error)
3299 goto out_unlock_iolock;
3303 * Need to zero the stuff we're not freeing, on disk.
3304 * If its a realtime file & can't use unwritten extents then we
3305 * actually need to zero the extent edges. Otherwise xfs_bunmapi
3306 * will take care of it for us.
3308 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
3309 nimap = 1;
3310 error = xfs_bmapi(NULL, ip, startoffset_fsb,
3311 1, 0, NULL, 0, &imap, &nimap, NULL, NULL);
3312 if (error)
3313 goto out_unlock_iolock;
3314 ASSERT(nimap == 0 || nimap == 1);
3315 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
3316 xfs_daddr_t block;
3318 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
3319 block = imap.br_startblock;
3320 mod = do_div(block, mp->m_sb.sb_rextsize);
3321 if (mod)
3322 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
3324 nimap = 1;
3325 error = xfs_bmapi(NULL, ip, endoffset_fsb - 1,
3326 1, 0, NULL, 0, &imap, &nimap, NULL, NULL);
3327 if (error)
3328 goto out_unlock_iolock;
3329 ASSERT(nimap == 0 || nimap == 1);
3330 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
3331 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
3332 mod++;
3333 if (mod && (mod != mp->m_sb.sb_rextsize))
3334 endoffset_fsb -= mod;
3337 if ((done = (endoffset_fsb <= startoffset_fsb)))
3339 * One contiguous piece to clear
3341 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
3342 else {
3344 * Some full blocks, possibly two pieces to clear
3346 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
3347 error = xfs_zero_remaining_bytes(ip, offset,
3348 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
3349 if (!error &&
3350 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
3351 error = xfs_zero_remaining_bytes(ip,
3352 XFS_FSB_TO_B(mp, endoffset_fsb),
3353 offset + len - 1);
3357 * free file space until done or until there is an error
3359 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
3360 while (!error && !done) {
3363 * allocate and setup the transaction. Allow this
3364 * transaction to dip into the reserve blocks to ensure
3365 * the freeing of the space succeeds at ENOSPC.
3367 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
3368 tp->t_flags |= XFS_TRANS_RESERVE;
3369 error = xfs_trans_reserve(tp,
3370 resblks,
3371 XFS_WRITE_LOG_RES(mp),
3373 XFS_TRANS_PERM_LOG_RES,
3374 XFS_WRITE_LOG_COUNT);
3377 * check for running out of space
3379 if (error) {
3381 * Free the transaction structure.
3383 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
3384 xfs_trans_cancel(tp, 0);
3385 break;
3387 xfs_ilock(ip, XFS_ILOCK_EXCL);
3388 error = XFS_TRANS_RESERVE_QUOTA(mp, tp,
3389 ip->i_udquot, ip->i_gdquot, resblks, 0,
3390 XFS_QMOPT_RES_REGBLKS);
3391 if (error)
3392 goto error1;
3394 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3395 xfs_trans_ihold(tp, ip);
3398 * issue the bunmapi() call to free the blocks
3400 XFS_BMAP_INIT(&free_list, &firstfsb);
3401 error = xfs_bunmapi(tp, ip, startoffset_fsb,
3402 endoffset_fsb - startoffset_fsb,
3403 0, 2, &firstfsb, &free_list, NULL, &done);
3404 if (error) {
3405 goto error0;
3409 * complete the transaction
3411 error = xfs_bmap_finish(&tp, &free_list, &committed);
3412 if (error) {
3413 goto error0;
3416 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
3417 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3420 out_unlock_iolock:
3421 if (need_iolock)
3422 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
3423 return error;
3425 error0:
3426 xfs_bmap_cancel(&free_list);
3427 error1:
3428 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
3429 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
3430 XFS_ILOCK_EXCL);
3431 return error;
3435 * xfs_change_file_space()
3436 * This routine allocates or frees disk space for the given file.
3437 * The user specified parameters are checked for alignment and size
3438 * limitations.
3440 * RETURNS:
3441 * 0 on success
3442 * errno on error
3446 xfs_change_file_space(
3447 xfs_inode_t *ip,
3448 int cmd,
3449 xfs_flock64_t *bf,
3450 xfs_off_t offset,
3451 cred_t *credp,
3452 int attr_flags)
3454 xfs_mount_t *mp = ip->i_mount;
3455 int clrprealloc;
3456 int error;
3457 xfs_fsize_t fsize;
3458 int setprealloc;
3459 xfs_off_t startoffset;
3460 xfs_off_t llen;
3461 xfs_trans_t *tp;
3462 struct iattr iattr;
3464 xfs_itrace_entry(ip);
3466 if (!S_ISREG(ip->i_d.di_mode))
3467 return XFS_ERROR(EINVAL);
3469 switch (bf->l_whence) {
3470 case 0: /*SEEK_SET*/
3471 break;
3472 case 1: /*SEEK_CUR*/
3473 bf->l_start += offset;
3474 break;
3475 case 2: /*SEEK_END*/
3476 bf->l_start += ip->i_size;
3477 break;
3478 default:
3479 return XFS_ERROR(EINVAL);
3482 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
3484 if ( (bf->l_start < 0)
3485 || (bf->l_start > XFS_MAXIOFFSET(mp))
3486 || (bf->l_start + llen < 0)
3487 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
3488 return XFS_ERROR(EINVAL);
3490 bf->l_whence = 0;
3492 startoffset = bf->l_start;
3493 fsize = ip->i_size;
3496 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
3497 * file space.
3498 * These calls do NOT zero the data space allocated to the file,
3499 * nor do they change the file size.
3501 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
3502 * space.
3503 * These calls cause the new file data to be zeroed and the file
3504 * size to be changed.
3506 setprealloc = clrprealloc = 0;
3508 switch (cmd) {
3509 case XFS_IOC_RESVSP:
3510 case XFS_IOC_RESVSP64:
3511 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
3512 1, attr_flags);
3513 if (error)
3514 return error;
3515 setprealloc = 1;
3516 break;
3518 case XFS_IOC_UNRESVSP:
3519 case XFS_IOC_UNRESVSP64:
3520 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
3521 attr_flags)))
3522 return error;
3523 break;
3525 case XFS_IOC_ALLOCSP:
3526 case XFS_IOC_ALLOCSP64:
3527 case XFS_IOC_FREESP:
3528 case XFS_IOC_FREESP64:
3529 if (startoffset > fsize) {
3530 error = xfs_alloc_file_space(ip, fsize,
3531 startoffset - fsize, 0, attr_flags);
3532 if (error)
3533 break;
3536 iattr.ia_valid = ATTR_SIZE;
3537 iattr.ia_size = startoffset;
3539 error = xfs_setattr(ip, &iattr, attr_flags, credp);
3541 if (error)
3542 return error;
3544 clrprealloc = 1;
3545 break;
3547 default:
3548 ASSERT(0);
3549 return XFS_ERROR(EINVAL);
3553 * update the inode timestamp, mode, and prealloc flag bits
3555 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
3557 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
3558 0, 0, 0))) {
3559 /* ASSERT(0); */
3560 xfs_trans_cancel(tp, 0);
3561 return error;
3564 xfs_ilock(ip, XFS_ILOCK_EXCL);
3566 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3567 xfs_trans_ihold(tp, ip);
3569 if ((attr_flags & XFS_ATTR_DMI) == 0) {
3570 ip->i_d.di_mode &= ~S_ISUID;
3573 * Note that we don't have to worry about mandatory
3574 * file locking being disabled here because we only
3575 * clear the S_ISGID bit if the Group execute bit is
3576 * on, but if it was on then mandatory locking wouldn't
3577 * have been enabled.
3579 if (ip->i_d.di_mode & S_IXGRP)
3580 ip->i_d.di_mode &= ~S_ISGID;
3582 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3584 if (setprealloc)
3585 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
3586 else if (clrprealloc)
3587 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
3589 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3590 xfs_trans_set_sync(tp);
3592 error = xfs_trans_commit(tp, 0);
3594 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3596 return error;