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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002 * Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32
33#include "xfs.h"
34#include "xfs_macros.h"
35#include "xfs_types.h"
36#include "xfs_inum.h"
37#include "xfs_log.h"
38#include "xfs_trans.h"
39#include "xfs_sb.h"
40#include "xfs_ag.h"
41#include "xfs_dir.h"
42#include "xfs_dir2.h"
43#include "xfs_dmapi.h"
44#include "xfs_mount.h"
45#include "xfs_alloc_btree.h"
46#include "xfs_bmap_btree.h"
47#include "xfs_ialloc_btree.h"
48#include "xfs_itable.h"
49#include "xfs_btree.h"
50#include "xfs_ialloc.h"
51#include "xfs_alloc.h"
52#include "xfs_attr_sf.h"
53#include "xfs_dir_sf.h"
54#include "xfs_dir2_sf.h"
55#include "xfs_dinode.h"
56#include "xfs_inode_item.h"
57#include "xfs_inode.h"
58#include "xfs_bmap.h"
59#include "xfs_da_btree.h"
60#include "xfs_attr.h"
61#include "xfs_rw.h"
62#include "xfs_refcache.h"
63#include "xfs_error.h"
64#include "xfs_bit.h"
65#include "xfs_rtalloc.h"
66#include "xfs_quota.h"
67#include "xfs_utils.h"
68#include "xfs_trans_space.h"
69#include "xfs_dir_leaf.h"
70#include "xfs_mac.h"
71#include "xfs_log_priv.h"
72
73
74/*
75 * The maximum pathlen is 1024 bytes. Since the minimum file system
76 * blocksize is 512 bytes, we can get a max of 2 extents back from
77 * bmapi.
78 */
79#define SYMLINK_MAPS 2
80
81/*
82 * For xfs, we check that the file isn't too big to be opened by this kernel.
83 * No other open action is required for regular files. Devices are handled
84 * through the specfs file system, pipes through fifofs. Device and
85 * fifo vnodes are "wrapped" by specfs and fifofs vnodes, respectively,
86 * when a new vnode is first looked up or created.
87 */
88STATIC int
89xfs_open(
90 bhv_desc_t *bdp,
91 cred_t *credp)
92{
93 int mode;
94 vnode_t *vp;
95 xfs_inode_t *ip;
96
97 vp = BHV_TO_VNODE(bdp);
98 ip = XFS_BHVTOI(bdp);
99
100 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
101 return XFS_ERROR(EIO);
102
103 /*
104 * If it's a directory with any blocks, read-ahead block 0
105 * as we're almost certain to have the next operation be a read there.
106 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000107 if (VN_ISDIR(vp) && ip->i_d.di_nextents > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 mode = xfs_ilock_map_shared(ip);
109 if (ip->i_d.di_nextents > 0)
110 (void)xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK);
111 xfs_iunlock(ip, mode);
112 }
113 return 0;
114}
115
116
117/*
118 * xfs_getattr
119 */
120STATIC int
121xfs_getattr(
122 bhv_desc_t *bdp,
123 vattr_t *vap,
124 int flags,
125 cred_t *credp)
126{
127 xfs_inode_t *ip;
128 xfs_mount_t *mp;
129 vnode_t *vp;
130
131 vp = BHV_TO_VNODE(bdp);
132 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
133
134 ip = XFS_BHVTOI(bdp);
135 mp = ip->i_mount;
136
137 if (XFS_FORCED_SHUTDOWN(mp))
138 return XFS_ERROR(EIO);
139
140 if (!(flags & ATTR_LAZY))
141 xfs_ilock(ip, XFS_ILOCK_SHARED);
142
143 vap->va_size = ip->i_d.di_size;
144 if (vap->va_mask == XFS_AT_SIZE)
145 goto all_done;
146
147 vap->va_nblocks =
148 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
149 vap->va_nodeid = ip->i_ino;
150#if XFS_BIG_INUMS
151 vap->va_nodeid += mp->m_inoadd;
152#endif
153 vap->va_nlink = ip->i_d.di_nlink;
154
155 /*
156 * Quick exit for non-stat callers
157 */
158 if ((vap->va_mask &
159 ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID|
160 XFS_AT_NLINK|XFS_AT_BLKSIZE)) == 0)
161 goto all_done;
162
163 /*
164 * Copy from in-core inode.
165 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000166 vap->va_mode = ip->i_d.di_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 vap->va_uid = ip->i_d.di_uid;
168 vap->va_gid = ip->i_d.di_gid;
169 vap->va_projid = ip->i_d.di_projid;
170
171 /*
172 * Check vnode type block/char vs. everything else.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000174 switch (ip->i_d.di_mode & S_IFMT) {
175 case S_IFBLK:
176 case S_IFCHR:
177 vap->va_rdev = ip->i_df.if_u2.if_rdev;
178 vap->va_blocksize = BLKDEV_IOSIZE;
179 break;
180 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 vap->va_rdev = 0;
182
183 if (!(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
184
185#if 0
186 /* Large block sizes confuse various
187 * user space programs, so letting the
188 * stripe size through is not a good
189 * idea for now.
190 */
191 vap->va_blocksize = mp->m_swidth ?
192 /*
193 * If the underlying volume is a stripe, then
194 * return the stripe width in bytes as the
195 * recommended I/O size.
196 */
197 (mp->m_swidth << mp->m_sb.sb_blocklog) :
198 /*
199 * Return the largest of the preferred buffer
200 * sizes since doing small I/Os into larger
201 * buffers causes buffers to be decommissioned.
202 * The value returned is in bytes.
203 */
204 (1 << (int)MAX(mp->m_readio_log,
205 mp->m_writeio_log));
206
207#else
208 vap->va_blocksize =
209 /*
210 * Return the largest of the preferred buffer
211 * sizes since doing small I/Os into larger
212 * buffers causes buffers to be decommissioned.
213 * The value returned is in bytes.
214 */
215 1 << (int)MAX(mp->m_readio_log,
216 mp->m_writeio_log);
217#endif
218 } else {
219
220 /*
221 * If the file blocks are being allocated from a
222 * realtime partition, then return the inode's
223 * realtime extent size or the realtime volume's
224 * extent size.
225 */
226 vap->va_blocksize = ip->i_d.di_extsize ?
227 (ip->i_d.di_extsize << mp->m_sb.sb_blocklog) :
228 (mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog);
229 }
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000230 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232
233 vap->va_atime.tv_sec = ip->i_d.di_atime.t_sec;
234 vap->va_atime.tv_nsec = ip->i_d.di_atime.t_nsec;
235 vap->va_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
236 vap->va_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
237 vap->va_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
238 vap->va_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
239
240 /*
241 * Exit for stat callers. See if any of the rest of the fields
242 * to be filled in are needed.
243 */
244 if ((vap->va_mask &
245 (XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS|
246 XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0)
247 goto all_done;
248
249 /*
250 * Convert di_flags to xflags.
251 */
252 vap->va_xflags = xfs_ip2xflags(ip);
253
254 /*
255 * Exit for inode revalidate. See if any of the rest of
256 * the fields to be filled in are needed.
257 */
258 if ((vap->va_mask &
259 (XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS|
260 XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0)
261 goto all_done;
262
263 vap->va_extsize = ip->i_d.di_extsize << mp->m_sb.sb_blocklog;
264 vap->va_nextents =
265 (ip->i_df.if_flags & XFS_IFEXTENTS) ?
266 ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) :
267 ip->i_d.di_nextents;
268 if (ip->i_afp)
269 vap->va_anextents =
270 (ip->i_afp->if_flags & XFS_IFEXTENTS) ?
271 ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) :
272 ip->i_d.di_anextents;
273 else
274 vap->va_anextents = 0;
275 vap->va_gen = ip->i_d.di_gen;
276
277 all_done:
278 if (!(flags & ATTR_LAZY))
279 xfs_iunlock(ip, XFS_ILOCK_SHARED);
280 return 0;
281}
282
283
284/*
285 * xfs_setattr
286 */
287int
288xfs_setattr(
289 bhv_desc_t *bdp,
290 vattr_t *vap,
291 int flags,
292 cred_t *credp)
293{
294 xfs_inode_t *ip;
295 xfs_trans_t *tp;
296 xfs_mount_t *mp;
297 int mask;
298 int code;
299 uint lock_flags;
300 uint commit_flags=0;
301 uid_t uid=0, iuid=0;
302 gid_t gid=0, igid=0;
303 int timeflags = 0;
304 vnode_t *vp;
305 xfs_prid_t projid=0, iprojid=0;
306 int mandlock_before, mandlock_after;
307 struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2;
308 int file_owner;
Dean Roehrich5fcbab32005-05-05 13:27:19 -0700309 int need_iolock = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311 vp = BHV_TO_VNODE(bdp);
312 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
313
314 if (vp->v_vfsp->vfs_flag & VFS_RDONLY)
315 return XFS_ERROR(EROFS);
316
317 /*
318 * Cannot set certain attributes.
319 */
320 mask = vap->va_mask;
321 if (mask & XFS_AT_NOSET) {
322 return XFS_ERROR(EINVAL);
323 }
324
325 ip = XFS_BHVTOI(bdp);
326 mp = ip->i_mount;
327
328 if (XFS_FORCED_SHUTDOWN(mp))
329 return XFS_ERROR(EIO);
330
331 /*
332 * Timestamps do not need to be logged and hence do not
333 * need to be done within a transaction.
334 */
335 if (mask & XFS_AT_UPDTIMES) {
336 ASSERT((mask & ~XFS_AT_UPDTIMES) == 0);
337 timeflags = ((mask & XFS_AT_UPDATIME) ? XFS_ICHGTIME_ACC : 0) |
338 ((mask & XFS_AT_UPDCTIME) ? XFS_ICHGTIME_CHG : 0) |
339 ((mask & XFS_AT_UPDMTIME) ? XFS_ICHGTIME_MOD : 0);
340 xfs_ichgtime(ip, timeflags);
341 return 0;
342 }
343
344 olddquot1 = olddquot2 = NULL;
345 udqp = gdqp = NULL;
346
347 /*
348 * If disk quotas is on, we make sure that the dquots do exist on disk,
349 * before we start any other transactions. Trying to do this later
350 * is messy. We don't care to take a readlock to look at the ids
351 * in inode here, because we can't hold it across the trans_reserve.
352 * If the IDs do change before we take the ilock, we're covered
353 * because the i_*dquot fields will get updated anyway.
354 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000355 if (XFS_IS_QUOTA_ON(mp) &&
356 (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 uint qflags = 0;
358
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000359 if ((mask & XFS_AT_UID) && XFS_IS_UQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 uid = vap->va_uid;
361 qflags |= XFS_QMOPT_UQUOTA;
362 } else {
363 uid = ip->i_d.di_uid;
364 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000365 if ((mask & XFS_AT_GID) && XFS_IS_GQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 gid = vap->va_gid;
367 qflags |= XFS_QMOPT_GQUOTA;
368 } else {
369 gid = ip->i_d.di_gid;
370 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000371 if ((mask & XFS_AT_PROJID) && XFS_IS_PQUOTA_ON(mp)) {
372 projid = vap->va_projid;
373 qflags |= XFS_QMOPT_PQUOTA;
374 } else {
375 projid = ip->i_d.di_projid;
376 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 /*
378 * We take a reference when we initialize udqp and gdqp,
379 * so it is important that we never blindly double trip on
380 * the same variable. See xfs_create() for an example.
381 */
382 ASSERT(udqp == NULL);
383 ASSERT(gdqp == NULL);
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000384 code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, projid, qflags,
385 &udqp, &gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 if (code)
387 return (code);
388 }
389
390 /*
391 * For the other attributes, we acquire the inode lock and
392 * first do an error checking pass.
393 */
394 tp = NULL;
395 lock_flags = XFS_ILOCK_EXCL;
Dean Roehrich5fcbab32005-05-05 13:27:19 -0700396 ASSERT(flags & ATTR_NOLOCK ? flags & ATTR_DMI : 1);
397 if (flags & ATTR_NOLOCK)
398 need_iolock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 if (!(mask & XFS_AT_SIZE)) {
400 if ((mask != (XFS_AT_CTIME|XFS_AT_ATIME|XFS_AT_MTIME)) ||
401 (mp->m_flags & XFS_MOUNT_WSYNC)) {
402 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
403 commit_flags = 0;
404 if ((code = xfs_trans_reserve(tp, 0,
405 XFS_ICHANGE_LOG_RES(mp), 0,
406 0, 0))) {
407 lock_flags = 0;
408 goto error_return;
409 }
410 }
411 } else {
412 if (DM_EVENT_ENABLED (vp->v_vfsp, ip, DM_EVENT_TRUNCATE) &&
413 !(flags & ATTR_DMI)) {
414 int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR;
415 code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, vp,
416 vap->va_size, 0, dmflags, NULL);
417 if (code) {
418 lock_flags = 0;
419 goto error_return;
420 }
421 }
422 if (need_iolock)
423 lock_flags |= XFS_IOLOCK_EXCL;
424 }
425
426 xfs_ilock(ip, lock_flags);
427
428 /* boolean: are we the file owner? */
429 file_owner = (current_fsuid(credp) == ip->i_d.di_uid);
430
431 /*
432 * Change various properties of a file.
433 * Only the owner or users with CAP_FOWNER
434 * capability may do these things.
435 */
436 if (mask &
437 (XFS_AT_MODE|XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_UID|
438 XFS_AT_GID|XFS_AT_PROJID)) {
439 /*
440 * CAP_FOWNER overrides the following restrictions:
441 *
442 * The user ID of the calling process must be equal
443 * to the file owner ID, except in cases where the
444 * CAP_FSETID capability is applicable.
445 */
446 if (!file_owner && !capable(CAP_FOWNER)) {
447 code = XFS_ERROR(EPERM);
448 goto error_return;
449 }
450
451 /*
452 * CAP_FSETID overrides the following restrictions:
453 *
454 * The effective user ID of the calling process shall match
455 * the file owner when setting the set-user-ID and
456 * set-group-ID bits on that file.
457 *
458 * The effective group ID or one of the supplementary group
459 * IDs of the calling process shall match the group owner of
460 * the file when setting the set-group-ID bit on that file
461 */
462 if (mask & XFS_AT_MODE) {
463 mode_t m = 0;
464
465 if ((vap->va_mode & S_ISUID) && !file_owner)
466 m |= S_ISUID;
467 if ((vap->va_mode & S_ISGID) &&
468 !in_group_p((gid_t)ip->i_d.di_gid))
469 m |= S_ISGID;
470#if 0
471 /* Linux allows this, Irix doesn't. */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000472 if ((vap->va_mode & S_ISVTX) && !VN_ISDIR(vp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 m |= S_ISVTX;
474#endif
475 if (m && !capable(CAP_FSETID))
476 vap->va_mode &= ~m;
477 }
478 }
479
480 /*
481 * Change file ownership. Must be the owner or privileged.
482 * If the system was configured with the "restricted_chown"
483 * option, the owner is not permitted to give away the file,
484 * and can change the group id only to a group of which he
485 * or she is a member.
486 */
487 if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) {
488 /*
489 * These IDs could have changed since we last looked at them.
490 * But, we're assured that if the ownership did change
491 * while we didn't have the inode locked, inode's dquot(s)
492 * would have changed also.
493 */
494 iuid = ip->i_d.di_uid;
495 iprojid = ip->i_d.di_projid;
496 igid = ip->i_d.di_gid;
497 gid = (mask & XFS_AT_GID) ? vap->va_gid : igid;
498 uid = (mask & XFS_AT_UID) ? vap->va_uid : iuid;
499 projid = (mask & XFS_AT_PROJID) ? (xfs_prid_t)vap->va_projid :
500 iprojid;
501
502 /*
503 * CAP_CHOWN overrides the following restrictions:
504 *
505 * If _POSIX_CHOWN_RESTRICTED is defined, this capability
506 * shall override the restriction that a process cannot
507 * change the user ID of a file it owns and the restriction
508 * that the group ID supplied to the chown() function
509 * shall be equal to either the group ID or one of the
510 * supplementary group IDs of the calling process.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 */
512 if (restricted_chown &&
513 (iuid != uid || (igid != gid &&
514 !in_group_p((gid_t)gid))) &&
515 !capable(CAP_CHOWN)) {
516 code = XFS_ERROR(EPERM);
517 goto error_return;
518 }
519 /*
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000520 * Do a quota reservation only if uid/projid/gid is actually
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 * going to change.
522 */
523 if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000524 (XFS_IS_PQUOTA_ON(mp) && iprojid != projid) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 (XFS_IS_GQUOTA_ON(mp) && igid != gid)) {
526 ASSERT(tp);
527 code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp,
528 capable(CAP_FOWNER) ?
529 XFS_QMOPT_FORCE_RES : 0);
530 if (code) /* out of quota */
531 goto error_return;
532 }
533 }
534
535 /*
536 * Truncate file. Must have write permission and not be a directory.
537 */
538 if (mask & XFS_AT_SIZE) {
539 /* Short circuit the truncate case for zero length files */
540 if ((vap->va_size == 0) &&
541 (ip->i_d.di_size == 0) && (ip->i_d.di_nextents == 0)) {
542 xfs_iunlock(ip, XFS_ILOCK_EXCL);
543 lock_flags &= ~XFS_ILOCK_EXCL;
544 if (mask & XFS_AT_CTIME)
545 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
546 code = 0;
547 goto error_return;
548 }
549
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000550 if (VN_ISDIR(vp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 code = XFS_ERROR(EISDIR);
552 goto error_return;
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000553 } else if (!VN_ISREG(vp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 code = XFS_ERROR(EINVAL);
555 goto error_return;
556 }
557 /*
558 * Make sure that the dquots are attached to the inode.
559 */
560 if ((code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED)))
561 goto error_return;
562 }
563
564 /*
565 * Change file access or modified times.
566 */
567 if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) {
568 if (!file_owner) {
569 if ((flags & ATTR_UTIME) &&
570 !capable(CAP_FOWNER)) {
571 code = XFS_ERROR(EPERM);
572 goto error_return;
573 }
574 }
575 }
576
577 /*
578 * Change extent size or realtime flag.
579 */
580 if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) {
581 /*
582 * Can't change extent size if any extents are allocated.
583 */
584 if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
585 (mask & XFS_AT_EXTSIZE) &&
586 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) !=
587 vap->va_extsize) ) {
588 code = XFS_ERROR(EINVAL); /* EFBIG? */
589 goto error_return;
590 }
591
592 /*
593 * Can't set extent size unless the file is marked, or
594 * about to be marked as a realtime file.
595 *
596 * This check will be removed when fixed size extents
597 * with buffered data writes is implemented.
598 *
599 */
600 if ((mask & XFS_AT_EXTSIZE) &&
601 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) !=
602 vap->va_extsize) &&
603 (!((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ||
604 ((mask & XFS_AT_XFLAGS) &&
605 (vap->va_xflags & XFS_XFLAG_REALTIME))))) {
606 code = XFS_ERROR(EINVAL);
607 goto error_return;
608 }
609
610 /*
611 * Can't change realtime flag if any extents are allocated.
612 */
613 if (ip->i_d.di_nextents && (mask & XFS_AT_XFLAGS) &&
614 (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
615 (vap->va_xflags & XFS_XFLAG_REALTIME)) {
616 code = XFS_ERROR(EINVAL); /* EFBIG? */
617 goto error_return;
618 }
619 /*
620 * Extent size must be a multiple of the appropriate block
621 * size, if set at all.
622 */
623 if ((mask & XFS_AT_EXTSIZE) && vap->va_extsize != 0) {
624 xfs_extlen_t size;
625
626 if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ||
627 ((mask & XFS_AT_XFLAGS) &&
628 (vap->va_xflags & XFS_XFLAG_REALTIME))) {
629 size = mp->m_sb.sb_rextsize <<
630 mp->m_sb.sb_blocklog;
631 } else {
632 size = mp->m_sb.sb_blocksize;
633 }
634 if (vap->va_extsize % size) {
635 code = XFS_ERROR(EINVAL);
636 goto error_return;
637 }
638 }
639 /*
640 * If realtime flag is set then must have realtime data.
641 */
642 if ((mask & XFS_AT_XFLAGS) &&
643 (vap->va_xflags & XFS_XFLAG_REALTIME)) {
644 if ((mp->m_sb.sb_rblocks == 0) ||
645 (mp->m_sb.sb_rextsize == 0) ||
646 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) {
647 code = XFS_ERROR(EINVAL);
648 goto error_return;
649 }
650 }
651
652 /*
653 * Can't modify an immutable/append-only file unless
654 * we have appropriate permission.
655 */
656 if ((mask & XFS_AT_XFLAGS) &&
657 (ip->i_d.di_flags &
658 (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) ||
659 (vap->va_xflags &
660 (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) &&
661 !capable(CAP_LINUX_IMMUTABLE)) {
662 code = XFS_ERROR(EPERM);
663 goto error_return;
664 }
665 }
666
667 /*
668 * Now we can make the changes. Before we join the inode
669 * to the transaction, if XFS_AT_SIZE is set then take care of
670 * the part of the truncation that must be done without the
671 * inode lock. This needs to be done before joining the inode
672 * to the transaction, because the inode cannot be unlocked
673 * once it is a part of the transaction.
674 */
675 if (mask & XFS_AT_SIZE) {
676 code = 0;
677 if (vap->va_size > ip->i_d.di_size)
678 code = xfs_igrow_start(ip, vap->va_size, credp);
679 xfs_iunlock(ip, XFS_ILOCK_EXCL);
680 if (!code)
681 code = xfs_itruncate_data(ip, vap->va_size);
682 if (code) {
683 ASSERT(tp == NULL);
684 lock_flags &= ~XFS_ILOCK_EXCL;
685 ASSERT(lock_flags == XFS_IOLOCK_EXCL);
686 goto error_return;
687 }
688 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
689 if ((code = xfs_trans_reserve(tp, 0,
690 XFS_ITRUNCATE_LOG_RES(mp), 0,
691 XFS_TRANS_PERM_LOG_RES,
692 XFS_ITRUNCATE_LOG_COUNT))) {
693 xfs_trans_cancel(tp, 0);
694 if (need_iolock)
695 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
696 return code;
697 }
698 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
699 xfs_ilock(ip, XFS_ILOCK_EXCL);
700 }
701
702 if (tp) {
703 xfs_trans_ijoin(tp, ip, lock_flags);
704 xfs_trans_ihold(tp, ip);
705 }
706
707 /* determine whether mandatory locking mode changes */
708 mandlock_before = MANDLOCK(vp, ip->i_d.di_mode);
709
710 /*
711 * Truncate file. Must have write permission and not be a directory.
712 */
713 if (mask & XFS_AT_SIZE) {
714 if (vap->va_size > ip->i_d.di_size) {
715 xfs_igrow_finish(tp, ip, vap->va_size,
716 !(flags & ATTR_DMI));
717 } else if ((vap->va_size <= ip->i_d.di_size) ||
718 ((vap->va_size == 0) && ip->i_d.di_nextents)) {
719 /*
720 * signal a sync transaction unless
721 * we're truncating an already unlinked
722 * file on a wsync filesystem
723 */
724 code = xfs_itruncate_finish(&tp, ip,
725 (xfs_fsize_t)vap->va_size,
726 XFS_DATA_FORK,
727 ((ip->i_d.di_nlink != 0 ||
728 !(mp->m_flags & XFS_MOUNT_WSYNC))
729 ? 1 : 0));
730 if (code) {
731 goto abort_return;
732 }
733 }
734 /*
735 * Have to do this even if the file's size doesn't change.
736 */
737 timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
738 }
739
740 /*
741 * Change file access modes.
742 */
743 if (mask & XFS_AT_MODE) {
744 ip->i_d.di_mode &= S_IFMT;
745 ip->i_d.di_mode |= vap->va_mode & ~S_IFMT;
746
747 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
748 timeflags |= XFS_ICHGTIME_CHG;
749 }
750
751 /*
752 * Change file ownership. Must be the owner or privileged.
753 * If the system was configured with the "restricted_chown"
754 * option, the owner is not permitted to give away the file,
755 * and can change the group id only to a group of which he
756 * or she is a member.
757 */
758 if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) {
759 /*
760 * CAP_FSETID overrides the following restrictions:
761 *
762 * The set-user-ID and set-group-ID bits of a file will be
763 * cleared upon successful return from chown()
764 */
765 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
766 !capable(CAP_FSETID)) {
767 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
768 }
769
770 /*
771 * Change the ownerships and register quota modifications
772 * in the transaction.
773 */
774 if (iuid != uid) {
775 if (XFS_IS_UQUOTA_ON(mp)) {
776 ASSERT(mask & XFS_AT_UID);
777 ASSERT(udqp);
778 olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
779 &ip->i_udquot, udqp);
780 }
781 ip->i_d.di_uid = uid;
782 }
783 if (igid != gid) {
784 if (XFS_IS_GQUOTA_ON(mp)) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000785 ASSERT(!XFS_IS_PQUOTA_ON(mp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 ASSERT(mask & XFS_AT_GID);
787 ASSERT(gdqp);
788 olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
789 &ip->i_gdquot, gdqp);
790 }
791 ip->i_d.di_gid = gid;
792 }
793 if (iprojid != projid) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000794 if (XFS_IS_PQUOTA_ON(mp)) {
795 ASSERT(!XFS_IS_GQUOTA_ON(mp));
796 ASSERT(mask & XFS_AT_PROJID);
797 ASSERT(gdqp);
798 olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
799 &ip->i_gdquot, gdqp);
800 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 ip->i_d.di_projid = projid;
802 /*
803 * We may have to rev the inode as well as
804 * the superblock version number since projids didn't
805 * exist before DINODE_VERSION_2 and SB_VERSION_NLINK.
806 */
807 if (ip->i_d.di_version == XFS_DINODE_VERSION_1)
808 xfs_bump_ino_vers2(tp, ip);
809 }
810
811 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
812 timeflags |= XFS_ICHGTIME_CHG;
813 }
814
815
816 /*
817 * Change file access or modified times.
818 */
819 if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) {
820 if (mask & XFS_AT_ATIME) {
821 ip->i_d.di_atime.t_sec = vap->va_atime.tv_sec;
822 ip->i_d.di_atime.t_nsec = vap->va_atime.tv_nsec;
823 ip->i_update_core = 1;
824 timeflags &= ~XFS_ICHGTIME_ACC;
825 }
826 if (mask & XFS_AT_MTIME) {
827 ip->i_d.di_mtime.t_sec = vap->va_mtime.tv_sec;
828 ip->i_d.di_mtime.t_nsec = vap->va_mtime.tv_nsec;
829 timeflags &= ~XFS_ICHGTIME_MOD;
830 timeflags |= XFS_ICHGTIME_CHG;
831 }
832 if (tp && (flags & ATTR_UTIME))
833 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
834 }
835
836 /*
837 * Change XFS-added attributes.
838 */
839 if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) {
840 if (mask & XFS_AT_EXTSIZE) {
841 /*
842 * Converting bytes to fs blocks.
843 */
844 ip->i_d.di_extsize = vap->va_extsize >>
845 mp->m_sb.sb_blocklog;
846 }
847 if (mask & XFS_AT_XFLAGS) {
848 uint di_flags;
849
850 /* can't set PREALLOC this way, just preserve it */
851 di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
852 if (vap->va_xflags & XFS_XFLAG_IMMUTABLE)
853 di_flags |= XFS_DIFLAG_IMMUTABLE;
854 if (vap->va_xflags & XFS_XFLAG_APPEND)
855 di_flags |= XFS_DIFLAG_APPEND;
856 if (vap->va_xflags & XFS_XFLAG_SYNC)
857 di_flags |= XFS_DIFLAG_SYNC;
858 if (vap->va_xflags & XFS_XFLAG_NOATIME)
859 di_flags |= XFS_DIFLAG_NOATIME;
860 if (vap->va_xflags & XFS_XFLAG_NODUMP)
861 di_flags |= XFS_DIFLAG_NODUMP;
Nathan Scott365ca832005-06-21 15:39:12 +1000862 if (vap->va_xflags & XFS_XFLAG_PROJINHERIT)
863 di_flags |= XFS_DIFLAG_PROJINHERIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
865 if (vap->va_xflags & XFS_XFLAG_RTINHERIT)
866 di_flags |= XFS_DIFLAG_RTINHERIT;
867 if (vap->va_xflags & XFS_XFLAG_NOSYMLINKS)
868 di_flags |= XFS_DIFLAG_NOSYMLINKS;
869 } else {
870 if (vap->va_xflags & XFS_XFLAG_REALTIME) {
871 di_flags |= XFS_DIFLAG_REALTIME;
872 ip->i_iocore.io_flags |= XFS_IOCORE_RT;
873 } else {
874 ip->i_iocore.io_flags &= ~XFS_IOCORE_RT;
875 }
876 }
877 ip->i_d.di_flags = di_flags;
878 }
879 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
880 timeflags |= XFS_ICHGTIME_CHG;
881 }
882
883 /*
884 * Change file inode change time only if XFS_AT_CTIME set
885 * AND we have been called by a DMI function.
886 */
887
888 if ( (flags & ATTR_DMI) && (mask & XFS_AT_CTIME) ) {
889 ip->i_d.di_ctime.t_sec = vap->va_ctime.tv_sec;
890 ip->i_d.di_ctime.t_nsec = vap->va_ctime.tv_nsec;
891 ip->i_update_core = 1;
892 timeflags &= ~XFS_ICHGTIME_CHG;
893 }
894
895 /*
896 * Send out timestamp changes that need to be set to the
897 * current time. Not done when called by a DMI function.
898 */
899 if (timeflags && !(flags & ATTR_DMI))
900 xfs_ichgtime(ip, timeflags);
901
902 XFS_STATS_INC(xs_ig_attrchg);
903
904 /*
905 * If this is a synchronous mount, make sure that the
906 * transaction goes to disk before returning to the user.
907 * This is slightly sub-optimal in that truncates require
908 * two sync transactions instead of one for wsync filesytems.
909 * One for the truncate and one for the timestamps since we
910 * don't want to change the timestamps unless we're sure the
911 * truncate worked. Truncates are less than 1% of the laddis
912 * mix so this probably isn't worth the trouble to optimize.
913 */
914 code = 0;
915 if (tp) {
916 if (mp->m_flags & XFS_MOUNT_WSYNC)
917 xfs_trans_set_sync(tp);
918
919 code = xfs_trans_commit(tp, commit_flags, NULL);
920 }
921
922 /*
923 * If the (regular) file's mandatory locking mode changed, then
924 * notify the vnode. We do this under the inode lock to prevent
925 * racing calls to vop_vnode_change.
926 */
927 mandlock_after = MANDLOCK(vp, ip->i_d.di_mode);
928 if (mandlock_before != mandlock_after) {
929 VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_ENF_LOCKING,
930 mandlock_after);
931 }
932
933 xfs_iunlock(ip, lock_flags);
934
935 /*
936 * Release any dquot(s) the inode had kept before chown.
937 */
938 XFS_QM_DQRELE(mp, olddquot1);
939 XFS_QM_DQRELE(mp, olddquot2);
940 XFS_QM_DQRELE(mp, udqp);
941 XFS_QM_DQRELE(mp, gdqp);
942
943 if (code) {
944 return code;
945 }
946
947 if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_ATTRIBUTE) &&
948 !(flags & ATTR_DMI)) {
949 (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, vp, DM_RIGHT_NULL,
950 NULL, DM_RIGHT_NULL, NULL, NULL,
951 0, 0, AT_DELAY_FLAG(flags));
952 }
953 return 0;
954
955 abort_return:
956 commit_flags |= XFS_TRANS_ABORT;
957 /* FALLTHROUGH */
958 error_return:
959 XFS_QM_DQRELE(mp, udqp);
960 XFS_QM_DQRELE(mp, gdqp);
961 if (tp) {
962 xfs_trans_cancel(tp, commit_flags);
963 }
964 if (lock_flags != 0) {
965 xfs_iunlock(ip, lock_flags);
966 }
967 return code;
968}
969
970
971/*
972 * xfs_access
973 * Null conversion from vnode mode bits to inode mode bits, as in efs.
974 */
975STATIC int
976xfs_access(
977 bhv_desc_t *bdp,
978 int mode,
979 cred_t *credp)
980{
981 xfs_inode_t *ip;
982 int error;
983
984 vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__,
985 (inst_t *)__return_address);
986
987 ip = XFS_BHVTOI(bdp);
988 xfs_ilock(ip, XFS_ILOCK_SHARED);
989 error = xfs_iaccess(ip, mode, credp);
990 xfs_iunlock(ip, XFS_ILOCK_SHARED);
991 return error;
992}
993
994
995/*
996 * xfs_readlink
997 *
998 */
999STATIC int
1000xfs_readlink(
1001 bhv_desc_t *bdp,
1002 uio_t *uiop,
1003 int ioflags,
1004 cred_t *credp)
1005{
1006 xfs_inode_t *ip;
1007 int count;
1008 xfs_off_t offset;
1009 int pathlen;
1010 vnode_t *vp;
1011 int error = 0;
1012 xfs_mount_t *mp;
1013 int nmaps;
1014 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1015 xfs_daddr_t d;
1016 int byte_cnt;
1017 int n;
1018 xfs_buf_t *bp;
1019
1020 vp = BHV_TO_VNODE(bdp);
1021 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
1022
1023 ip = XFS_BHVTOI(bdp);
1024 mp = ip->i_mount;
1025
1026 if (XFS_FORCED_SHUTDOWN(mp))
1027 return XFS_ERROR(EIO);
1028
1029 xfs_ilock(ip, XFS_ILOCK_SHARED);
1030
1031 ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
1032
1033 offset = uiop->uio_offset;
1034 count = uiop->uio_resid;
1035
1036 if (offset < 0) {
1037 error = XFS_ERROR(EINVAL);
1038 goto error_return;
1039 }
1040 if (count <= 0) {
1041 error = 0;
1042 goto error_return;
1043 }
1044
1045 if (!(ioflags & IO_INVIS)) {
1046 xfs_ichgtime(ip, XFS_ICHGTIME_ACC);
1047 }
1048
1049 /*
1050 * See if the symlink is stored inline.
1051 */
1052 pathlen = (int)ip->i_d.di_size;
1053
1054 if (ip->i_df.if_flags & XFS_IFINLINE) {
1055 error = uio_read(ip->i_df.if_u1.if_data, pathlen, uiop);
1056 }
1057 else {
1058 /*
1059 * Symlink not inline. Call bmap to get it in.
1060 */
1061 nmaps = SYMLINK_MAPS;
1062
1063 error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen),
1064 0, NULL, 0, mval, &nmaps, NULL);
1065
1066 if (error) {
1067 goto error_return;
1068 }
1069
1070 for (n = 0; n < nmaps; n++) {
1071 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
1072 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
1073 bp = xfs_buf_read(mp->m_ddev_targp, d,
1074 BTOBB(byte_cnt), 0);
1075 error = XFS_BUF_GETERROR(bp);
1076 if (error) {
1077 xfs_ioerror_alert("xfs_readlink",
1078 ip->i_mount, bp, XFS_BUF_ADDR(bp));
1079 xfs_buf_relse(bp);
1080 goto error_return;
1081 }
1082 if (pathlen < byte_cnt)
1083 byte_cnt = pathlen;
1084 pathlen -= byte_cnt;
1085
1086 error = uio_read(XFS_BUF_PTR(bp), byte_cnt, uiop);
1087 xfs_buf_relse (bp);
1088 }
1089
1090 }
1091
1092
1093error_return:
1094
1095 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1096
1097 return error;
1098}
1099
1100
1101/*
1102 * xfs_fsync
1103 *
1104 * This is called to sync the inode and its data out to disk.
1105 * We need to hold the I/O lock while flushing the data, and
1106 * the inode lock while flushing the inode. The inode lock CANNOT
1107 * be held while flushing the data, so acquire after we're done
1108 * with that.
1109 */
1110STATIC int
1111xfs_fsync(
1112 bhv_desc_t *bdp,
1113 int flag,
1114 cred_t *credp,
1115 xfs_off_t start,
1116 xfs_off_t stop)
1117{
1118 xfs_inode_t *ip;
1119 xfs_trans_t *tp;
1120 int error;
1121
1122 vn_trace_entry(BHV_TO_VNODE(bdp),
1123 __FUNCTION__, (inst_t *)__return_address);
1124
1125 ip = XFS_BHVTOI(bdp);
1126
1127 ASSERT(start >= 0 && stop >= -1);
1128
1129 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
1130 return XFS_ERROR(EIO);
1131
1132 /*
1133 * We always need to make sure that the required inode state
1134 * is safe on disk. The vnode might be clean but because
1135 * of committed transactions that haven't hit the disk yet.
1136 * Likewise, there could be unflushed non-transactional
1137 * changes to the inode core that have to go to disk.
1138 *
1139 * The following code depends on one assumption: that
1140 * any transaction that changes an inode logs the core
1141 * because it has to change some field in the inode core
1142 * (typically nextents or nblocks). That assumption
1143 * implies that any transactions against an inode will
1144 * catch any non-transactional updates. If inode-altering
1145 * transactions exist that violate this assumption, the
1146 * code breaks. Right now, it figures that if the involved
1147 * update_* field is clear and the inode is unpinned, the
1148 * inode is clean. Either it's been flushed or it's been
1149 * committed and the commit has hit the disk unpinning the inode.
1150 * (Note that xfs_inode_item_format() called at commit clears
1151 * the update_* fields.)
1152 */
1153 xfs_ilock(ip, XFS_ILOCK_SHARED);
1154
1155 /* If we are flushing data then we care about update_size
1156 * being set, otherwise we care about update_core
1157 */
1158 if ((flag & FSYNC_DATA) ?
1159 (ip->i_update_size == 0) :
1160 (ip->i_update_core == 0)) {
1161 /*
1162 * Timestamps/size haven't changed since last inode
1163 * flush or inode transaction commit. That means
1164 * either nothing got written or a transaction
1165 * committed which caught the updates. If the
1166 * latter happened and the transaction hasn't
1167 * hit the disk yet, the inode will be still
1168 * be pinned. If it is, force the log.
1169 */
1170
1171 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1172
1173 if (xfs_ipincount(ip)) {
1174 xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
1175 XFS_LOG_FORCE |
1176 ((flag & FSYNC_WAIT)
1177 ? XFS_LOG_SYNC : 0));
1178 }
1179 error = 0;
1180 } else {
1181 /*
1182 * Kick off a transaction to log the inode
1183 * core to get the updates. Make it
1184 * sync if FSYNC_WAIT is passed in (which
1185 * is done by everybody but specfs). The
1186 * sync transaction will also force the log.
1187 */
1188 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1189 tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
1190 if ((error = xfs_trans_reserve(tp, 0,
1191 XFS_FSYNC_TS_LOG_RES(ip->i_mount),
1192 0, 0, 0))) {
1193 xfs_trans_cancel(tp, 0);
1194 return error;
1195 }
1196 xfs_ilock(ip, XFS_ILOCK_EXCL);
1197
1198 /*
1199 * Note - it's possible that we might have pushed
1200 * ourselves out of the way during trans_reserve
1201 * which would flush the inode. But there's no
1202 * guarantee that the inode buffer has actually
1203 * gone out yet (it's delwri). Plus the buffer
1204 * could be pinned anyway if it's part of an
1205 * inode in another recent transaction. So we
1206 * play it safe and fire off the transaction anyway.
1207 */
1208 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1209 xfs_trans_ihold(tp, ip);
1210 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1211 if (flag & FSYNC_WAIT)
1212 xfs_trans_set_sync(tp);
1213 error = xfs_trans_commit(tp, 0, NULL);
1214
1215 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1216 }
1217 return error;
1218}
1219
1220/*
1221 * This is called by xfs_inactive to free any blocks beyond eof,
1222 * when the link count isn't zero.
1223 */
1224STATIC int
1225xfs_inactive_free_eofblocks(
1226 xfs_mount_t *mp,
1227 xfs_inode_t *ip)
1228{
1229 xfs_trans_t *tp;
1230 int error;
1231 xfs_fileoff_t end_fsb;
1232 xfs_fileoff_t last_fsb;
1233 xfs_filblks_t map_len;
1234 int nimaps;
1235 xfs_bmbt_irec_t imap;
1236
1237 /*
1238 * Figure out if there are any blocks beyond the end
1239 * of the file. If not, then there is nothing to do.
1240 */
1241 end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_d.di_size));
1242 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
1243 map_len = last_fsb - end_fsb;
1244 if (map_len <= 0)
1245 return (0);
1246
1247 nimaps = 1;
1248 xfs_ilock(ip, XFS_ILOCK_SHARED);
1249 error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0,
1250 NULL, 0, &imap, &nimaps, NULL);
1251 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1252
1253 if (!error && (nimaps != 0) &&
1254 (imap.br_startblock != HOLESTARTBLOCK)) {
1255 /*
1256 * Attach the dquots to the inode up front.
1257 */
1258 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
1259 return (error);
1260
1261 /*
1262 * There are blocks after the end of file.
1263 * Free them up now by truncating the file to
1264 * its current size.
1265 */
1266 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1267
1268 /*
1269 * Do the xfs_itruncate_start() call before
1270 * reserving any log space because
1271 * itruncate_start will call into the buffer
1272 * cache and we can't
1273 * do that within a transaction.
1274 */
1275 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1276 xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
1277 ip->i_d.di_size);
1278
1279 error = xfs_trans_reserve(tp, 0,
1280 XFS_ITRUNCATE_LOG_RES(mp),
1281 0, XFS_TRANS_PERM_LOG_RES,
1282 XFS_ITRUNCATE_LOG_COUNT);
1283 if (error) {
1284 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1285 xfs_trans_cancel(tp, 0);
1286 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1287 return (error);
1288 }
1289
1290 xfs_ilock(ip, XFS_ILOCK_EXCL);
1291 xfs_trans_ijoin(tp, ip,
1292 XFS_IOLOCK_EXCL |
1293 XFS_ILOCK_EXCL);
1294 xfs_trans_ihold(tp, ip);
1295
1296 error = xfs_itruncate_finish(&tp, ip,
1297 ip->i_d.di_size,
1298 XFS_DATA_FORK,
1299 0);
1300 /*
1301 * If we get an error at this point we
1302 * simply don't bother truncating the file.
1303 */
1304 if (error) {
1305 xfs_trans_cancel(tp,
1306 (XFS_TRANS_RELEASE_LOG_RES |
1307 XFS_TRANS_ABORT));
1308 } else {
1309 error = xfs_trans_commit(tp,
1310 XFS_TRANS_RELEASE_LOG_RES,
1311 NULL);
1312 }
1313 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1314 }
1315 return (error);
1316}
1317
1318/*
1319 * Free a symlink that has blocks associated with it.
1320 */
1321STATIC int
1322xfs_inactive_symlink_rmt(
1323 xfs_inode_t *ip,
1324 xfs_trans_t **tpp)
1325{
1326 xfs_buf_t *bp;
1327 int committed;
1328 int done;
1329 int error;
1330 xfs_fsblock_t first_block;
1331 xfs_bmap_free_t free_list;
1332 int i;
1333 xfs_mount_t *mp;
1334 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1335 int nmaps;
1336 xfs_trans_t *ntp;
1337 int size;
1338 xfs_trans_t *tp;
1339
1340 tp = *tpp;
1341 mp = ip->i_mount;
1342 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
1343 /*
1344 * We're freeing a symlink that has some
1345 * blocks allocated to it. Free the
1346 * blocks here. We know that we've got
1347 * either 1 or 2 extents and that we can
1348 * free them all in one bunmapi call.
1349 */
1350 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
1351 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
1352 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
1353 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1354 xfs_trans_cancel(tp, 0);
1355 *tpp = NULL;
1356 return error;
1357 }
1358 /*
1359 * Lock the inode, fix the size, and join it to the transaction.
1360 * Hold it so in the normal path, we still have it locked for
1361 * the second transaction. In the error paths we need it
1362 * held so the cancel won't rele it, see below.
1363 */
1364 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1365 size = (int)ip->i_d.di_size;
1366 ip->i_d.di_size = 0;
1367 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1368 xfs_trans_ihold(tp, ip);
1369 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1370 /*
1371 * Find the block(s) so we can inval and unmap them.
1372 */
1373 done = 0;
1374 XFS_BMAP_INIT(&free_list, &first_block);
1375 nmaps = sizeof(mval) / sizeof(mval[0]);
1376 if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
1377 XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
1378 &free_list)))
1379 goto error0;
1380 /*
1381 * Invalidate the block(s).
1382 */
1383 for (i = 0; i < nmaps; i++) {
1384 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1385 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
1386 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
1387 xfs_trans_binval(tp, bp);
1388 }
1389 /*
1390 * Unmap the dead block(s) to the free_list.
1391 */
1392 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
1393 &first_block, &free_list, &done)))
1394 goto error1;
1395 ASSERT(done);
1396 /*
1397 * Commit the first transaction. This logs the EFI and the inode.
1398 */
1399 if ((error = xfs_bmap_finish(&tp, &free_list, first_block, &committed)))
1400 goto error1;
1401 /*
1402 * The transaction must have been committed, since there were
1403 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
1404 * The new tp has the extent freeing and EFDs.
1405 */
1406 ASSERT(committed);
1407 /*
1408 * The first xact was committed, so add the inode to the new one.
1409 * Mark it dirty so it will be logged and moved forward in the log as
1410 * part of every commit.
1411 */
1412 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1413 xfs_trans_ihold(tp, ip);
1414 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1415 /*
1416 * Get a new, empty transaction to return to our caller.
1417 */
1418 ntp = xfs_trans_dup(tp);
1419 /*
1420 * Commit the transaction containing extent freeing and EFD's.
1421 * If we get an error on the commit here or on the reserve below,
1422 * we need to unlock the inode since the new transaction doesn't
1423 * have the inode attached.
1424 */
1425 error = xfs_trans_commit(tp, 0, NULL);
1426 tp = ntp;
1427 if (error) {
1428 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1429 goto error0;
1430 }
1431 /*
1432 * Remove the memory for extent descriptions (just bookkeeping).
1433 */
1434 if (ip->i_df.if_bytes)
1435 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
1436 ASSERT(ip->i_df.if_bytes == 0);
1437 /*
1438 * Put an itruncate log reservation in the new transaction
1439 * for our caller.
1440 */
1441 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
1442 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
1443 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1444 goto error0;
1445 }
1446 /*
1447 * Return with the inode locked but not joined to the transaction.
1448 */
1449 *tpp = tp;
1450 return 0;
1451
1452 error1:
1453 xfs_bmap_cancel(&free_list);
1454 error0:
1455 /*
1456 * Have to come here with the inode locked and either
1457 * (held and in the transaction) or (not in the transaction).
1458 * If the inode isn't held then cancel would iput it, but
1459 * that's wrong since this is inactive and the vnode ref
1460 * count is 0 already.
1461 * Cancel won't do anything to the inode if held, but it still
1462 * needs to be locked until the cancel is done, if it was
1463 * joined to the transaction.
1464 */
1465 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1466 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1467 *tpp = NULL;
1468 return error;
1469
1470}
1471
1472STATIC int
1473xfs_inactive_symlink_local(
1474 xfs_inode_t *ip,
1475 xfs_trans_t **tpp)
1476{
1477 int error;
1478
1479 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
1480 /*
1481 * We're freeing a symlink which fit into
1482 * the inode. Just free the memory used
1483 * to hold the old symlink.
1484 */
1485 error = xfs_trans_reserve(*tpp, 0,
1486 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
1487 0, XFS_TRANS_PERM_LOG_RES,
1488 XFS_ITRUNCATE_LOG_COUNT);
1489
1490 if (error) {
1491 xfs_trans_cancel(*tpp, 0);
1492 *tpp = NULL;
1493 return (error);
1494 }
1495 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1496
1497 /*
1498 * Zero length symlinks _can_ exist.
1499 */
1500 if (ip->i_df.if_bytes > 0) {
1501 xfs_idata_realloc(ip,
1502 -(ip->i_df.if_bytes),
1503 XFS_DATA_FORK);
1504 ASSERT(ip->i_df.if_bytes == 0);
1505 }
1506 return (0);
1507}
1508
1509/*
1510 *
1511 */
1512STATIC int
1513xfs_inactive_attrs(
1514 xfs_inode_t *ip,
1515 xfs_trans_t **tpp)
1516{
1517 xfs_trans_t *tp;
1518 int error;
1519 xfs_mount_t *mp;
1520
1521 ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
1522 tp = *tpp;
1523 mp = ip->i_mount;
1524 ASSERT(ip->i_d.di_forkoff != 0);
1525 xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
1526 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1527
1528 error = xfs_attr_inactive(ip);
1529 if (error) {
1530 *tpp = NULL;
1531 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1532 return (error); /* goto out*/
1533 }
1534
1535 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1536 error = xfs_trans_reserve(tp, 0,
1537 XFS_IFREE_LOG_RES(mp),
1538 0, XFS_TRANS_PERM_LOG_RES,
1539 XFS_INACTIVE_LOG_COUNT);
1540 if (error) {
1541 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1542 xfs_trans_cancel(tp, 0);
1543 *tpp = NULL;
1544 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1545 return (error);
1546 }
1547
1548 xfs_ilock(ip, XFS_ILOCK_EXCL);
1549 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1550 xfs_trans_ihold(tp, ip);
1551 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1552
1553 ASSERT(ip->i_d.di_anextents == 0);
1554
1555 *tpp = tp;
1556 return (0);
1557}
1558
1559STATIC int
1560xfs_release(
1561 bhv_desc_t *bdp)
1562{
1563 xfs_inode_t *ip;
1564 vnode_t *vp;
1565 xfs_mount_t *mp;
1566 int error;
1567
1568 vp = BHV_TO_VNODE(bdp);
1569 ip = XFS_BHVTOI(bdp);
1570
Christoph Hellwig0432dab2005-09-02 16:46:51 +10001571 if (!VN_ISREG(vp) || (ip->i_d.di_mode == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 return 0;
1573 }
1574
1575 /* If this is a read-only mount, don't do this (would generate I/O) */
1576 if (vp->v_vfsp->vfs_flag & VFS_RDONLY)
1577 return 0;
1578
1579#ifdef HAVE_REFCACHE
1580 /* If we are in the NFS reference cache then don't do this now */
1581 if (ip->i_refcache)
1582 return 0;
1583#endif
1584
1585 mp = ip->i_mount;
1586
1587 if (ip->i_d.di_nlink != 0) {
1588 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1589 ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) &&
1590 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
1591 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)))) {
1592 if ((error = xfs_inactive_free_eofblocks(mp, ip)))
1593 return (error);
1594 /* Update linux inode block count after free above */
1595 LINVFS_GET_IP(vp)->i_blocks = XFS_FSB_TO_BB(mp,
1596 ip->i_d.di_nblocks + ip->i_delayed_blks);
1597 }
1598 }
1599
1600 return 0;
1601}
1602
1603/*
1604 * xfs_inactive
1605 *
1606 * This is called when the vnode reference count for the vnode
1607 * goes to zero. If the file has been unlinked, then it must
1608 * now be truncated. Also, we clear all of the read-ahead state
1609 * kept for the inode here since the file is now closed.
1610 */
1611STATIC int
1612xfs_inactive(
1613 bhv_desc_t *bdp,
1614 cred_t *credp)
1615{
1616 xfs_inode_t *ip;
1617 vnode_t *vp;
1618 xfs_bmap_free_t free_list;
1619 xfs_fsblock_t first_block;
1620 int committed;
1621 xfs_trans_t *tp;
1622 xfs_mount_t *mp;
1623 int error;
1624 int truncate;
1625
1626 vp = BHV_TO_VNODE(bdp);
1627 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
1628
1629 ip = XFS_BHVTOI(bdp);
1630
1631 /*
1632 * If the inode is already free, then there can be nothing
1633 * to clean up here.
1634 */
1635 if (ip->i_d.di_mode == 0 || VN_BAD(vp)) {
1636 ASSERT(ip->i_df.if_real_bytes == 0);
1637 ASSERT(ip->i_df.if_broot_bytes == 0);
1638 return VN_INACTIVE_CACHE;
1639 }
1640
1641 /*
1642 * Only do a truncate if it's a regular file with
1643 * some actual space in it. It's OK to look at the
1644 * inode's fields without the lock because we're the
1645 * only one with a reference to the inode.
1646 */
1647 truncate = ((ip->i_d.di_nlink == 0) &&
1648 ((ip->i_d.di_size != 0) || (ip->i_d.di_nextents > 0)) &&
1649 ((ip->i_d.di_mode & S_IFMT) == S_IFREG));
1650
1651 mp = ip->i_mount;
1652
1653 if (ip->i_d.di_nlink == 0 &&
1654 DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_DESTROY)) {
1655 (void) XFS_SEND_DESTROY(mp, vp, DM_RIGHT_NULL);
1656 }
1657
1658 error = 0;
1659
1660 /* If this is a read-only mount, don't do this (would generate I/O) */
1661 if (vp->v_vfsp->vfs_flag & VFS_RDONLY)
1662 goto out;
1663
1664 if (ip->i_d.di_nlink != 0) {
1665 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
1666 ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) &&
1667 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
1668 (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)) ||
1669 (ip->i_delayed_blks != 0))) {
1670 if ((error = xfs_inactive_free_eofblocks(mp, ip)))
1671 return (VN_INACTIVE_CACHE);
1672 /* Update linux inode block count after free above */
1673 LINVFS_GET_IP(vp)->i_blocks = XFS_FSB_TO_BB(mp,
1674 ip->i_d.di_nblocks + ip->i_delayed_blks);
1675 }
1676 goto out;
1677 }
1678
1679 ASSERT(ip->i_d.di_nlink == 0);
1680
1681 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
1682 return (VN_INACTIVE_CACHE);
1683
1684 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1685 if (truncate) {
1686 /*
1687 * Do the xfs_itruncate_start() call before
1688 * reserving any log space because itruncate_start
1689 * will call into the buffer cache and we can't
1690 * do that within a transaction.
1691 */
1692 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1693
1694 xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
1695
1696 error = xfs_trans_reserve(tp, 0,
1697 XFS_ITRUNCATE_LOG_RES(mp),
1698 0, XFS_TRANS_PERM_LOG_RES,
1699 XFS_ITRUNCATE_LOG_COUNT);
1700 if (error) {
1701 /* Don't call itruncate_cleanup */
1702 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1703 xfs_trans_cancel(tp, 0);
1704 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1705 return (VN_INACTIVE_CACHE);
1706 }
1707
1708 xfs_ilock(ip, XFS_ILOCK_EXCL);
1709 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1710 xfs_trans_ihold(tp, ip);
1711
1712 /*
1713 * normally, we have to run xfs_itruncate_finish sync.
1714 * But if filesystem is wsync and we're in the inactive
1715 * path, then we know that nlink == 0, and that the
1716 * xaction that made nlink == 0 is permanently committed
1717 * since xfs_remove runs as a synchronous transaction.
1718 */
1719 error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK,
1720 (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0));
1721
1722 if (error) {
1723 xfs_trans_cancel(tp,
1724 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1725 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1726 return (VN_INACTIVE_CACHE);
1727 }
1728 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) {
1729
1730 /*
1731 * If we get an error while cleaning up a
1732 * symlink we bail out.
1733 */
1734 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
1735 xfs_inactive_symlink_rmt(ip, &tp) :
1736 xfs_inactive_symlink_local(ip, &tp);
1737
1738 if (error) {
1739 ASSERT(tp == NULL);
1740 return (VN_INACTIVE_CACHE);
1741 }
1742
1743 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1744 xfs_trans_ihold(tp, ip);
1745 } else {
1746 error = xfs_trans_reserve(tp, 0,
1747 XFS_IFREE_LOG_RES(mp),
1748 0, XFS_TRANS_PERM_LOG_RES,
1749 XFS_INACTIVE_LOG_COUNT);
1750 if (error) {
1751 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1752 xfs_trans_cancel(tp, 0);
1753 return (VN_INACTIVE_CACHE);
1754 }
1755
1756 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1757 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1758 xfs_trans_ihold(tp, ip);
1759 }
1760
1761 /*
1762 * If there are attributes associated with the file
1763 * then blow them away now. The code calls a routine
1764 * that recursively deconstructs the attribute fork.
1765 * We need to just commit the current transaction
1766 * because we can't use it for xfs_attr_inactive().
1767 */
1768 if (ip->i_d.di_anextents > 0) {
1769 error = xfs_inactive_attrs(ip, &tp);
1770 /*
1771 * If we got an error, the transaction is already
1772 * cancelled, and the inode is unlocked. Just get out.
1773 */
1774 if (error)
1775 return (VN_INACTIVE_CACHE);
1776 } else if (ip->i_afp) {
1777 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1778 }
1779
1780 /*
1781 * Free the inode.
1782 */
1783 XFS_BMAP_INIT(&free_list, &first_block);
1784 error = xfs_ifree(tp, ip, &free_list);
1785 if (error) {
1786 /*
1787 * If we fail to free the inode, shut down. The cancel
1788 * might do that, we need to make sure. Otherwise the
1789 * inode might be lost for a long time or forever.
1790 */
1791 if (!XFS_FORCED_SHUTDOWN(mp)) {
1792 cmn_err(CE_NOTE,
1793 "xfs_inactive: xfs_ifree() returned an error = %d on %s",
1794 error, mp->m_fsname);
1795 xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR);
1796 }
1797 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
1798 } else {
1799 /*
1800 * Credit the quota account(s). The inode is gone.
1801 */
1802 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1803
1804 /*
1805 * Just ignore errors at this point. There is
1806 * nothing we can do except to try to keep going.
1807 */
1808 (void) xfs_bmap_finish(&tp, &free_list, first_block,
1809 &committed);
1810 (void) xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
1811 }
1812 /*
1813 * Release the dquots held by inode, if any.
1814 */
1815 XFS_QM_DQDETACH(mp, ip);
1816
1817 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1818
1819 out:
1820 return VN_INACTIVE_CACHE;
1821}
1822
1823
1824/*
1825 * xfs_lookup
1826 */
1827STATIC int
1828xfs_lookup(
1829 bhv_desc_t *dir_bdp,
1830 vname_t *dentry,
1831 vnode_t **vpp,
1832 int flags,
1833 vnode_t *rdir,
1834 cred_t *credp)
1835{
1836 xfs_inode_t *dp, *ip;
1837 xfs_ino_t e_inum;
1838 int error;
1839 uint lock_mode;
1840 vnode_t *dir_vp;
1841
1842 dir_vp = BHV_TO_VNODE(dir_bdp);
1843 vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address);
1844
1845 dp = XFS_BHVTOI(dir_bdp);
1846
1847 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
1848 return XFS_ERROR(EIO);
1849
1850 lock_mode = xfs_ilock_map_shared(dp);
1851 error = xfs_dir_lookup_int(dir_bdp, lock_mode, dentry, &e_inum, &ip);
1852 if (!error) {
1853 *vpp = XFS_ITOV(ip);
1854 ITRACE(ip);
1855 }
1856 xfs_iunlock_map_shared(dp, lock_mode);
1857 return error;
1858}
1859
1860
1861/*
1862 * xfs_create (create a new file).
1863 */
1864STATIC int
1865xfs_create(
1866 bhv_desc_t *dir_bdp,
1867 vname_t *dentry,
1868 vattr_t *vap,
1869 vnode_t **vpp,
1870 cred_t *credp)
1871{
1872 char *name = VNAME(dentry);
1873 vnode_t *dir_vp;
1874 xfs_inode_t *dp, *ip;
1875 vnode_t *vp=NULL;
1876 xfs_trans_t *tp;
1877 xfs_mount_t *mp;
1878 xfs_dev_t rdev;
1879 int error;
1880 xfs_bmap_free_t free_list;
1881 xfs_fsblock_t first_block;
1882 boolean_t dp_joined_to_trans;
1883 int dm_event_sent = 0;
1884 uint cancel_flags;
1885 int committed;
1886 xfs_prid_t prid;
1887 struct xfs_dquot *udqp, *gdqp;
1888 uint resblks;
1889 int dm_di_mode;
1890 int namelen;
1891
1892 ASSERT(!*vpp);
1893 dir_vp = BHV_TO_VNODE(dir_bdp);
1894 vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address);
1895
1896 dp = XFS_BHVTOI(dir_bdp);
1897 mp = dp->i_mount;
1898
Christoph Hellwig0432dab2005-09-02 16:46:51 +10001899 dm_di_mode = vap->va_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 namelen = VNAMELEN(dentry);
1901
1902 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) {
1903 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
1904 dir_vp, DM_RIGHT_NULL, NULL,
1905 DM_RIGHT_NULL, name, NULL,
1906 dm_di_mode, 0, 0);
1907
1908 if (error)
1909 return error;
1910 dm_event_sent = 1;
1911 }
1912
1913 if (XFS_FORCED_SHUTDOWN(mp))
1914 return XFS_ERROR(EIO);
1915
1916 /* Return through std_return after this point. */
1917
1918 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10001919 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1920 prid = dp->i_d.di_projid;
1921 else if (vap->va_mask & XFS_AT_PROJID)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 prid = (xfs_prid_t)vap->va_projid;
1923 else
1924 prid = (xfs_prid_t)dfltprid;
1925
1926 /*
1927 * Make sure that we have allocated dquot(s) on disk.
1928 */
1929 error = XFS_QM_DQVOPALLOC(mp, dp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001930 current_fsuid(credp), current_fsgid(credp), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp);
1932 if (error)
1933 goto std_return;
1934
1935 ip = NULL;
1936 dp_joined_to_trans = B_FALSE;
1937
1938 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
1939 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1940 resblks = XFS_CREATE_SPACE_RES(mp, namelen);
1941 /*
1942 * Initially assume that the file does not exist and
1943 * reserve the resources for that case. If that is not
1944 * the case we'll drop the one we have and get a more
1945 * appropriate transaction later.
1946 */
1947 error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0,
1948 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1949 if (error == ENOSPC) {
1950 resblks = 0;
1951 error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0,
1952 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1953 }
1954 if (error) {
1955 cancel_flags = 0;
1956 dp = NULL;
1957 goto error_return;
1958 }
1959
1960 xfs_ilock(dp, XFS_ILOCK_EXCL);
1961
1962 XFS_BMAP_INIT(&free_list, &first_block);
1963
1964 ASSERT(ip == NULL);
1965
1966 /*
1967 * Reserve disk quota and the inode.
1968 */
1969 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
1970 if (error)
1971 goto error_return;
1972
1973 if (resblks == 0 &&
1974 (error = XFS_DIR_CANENTER(mp, tp, dp, name, namelen)))
1975 goto error_return;
1976 rdev = (vap->va_mask & XFS_AT_RDEV) ? vap->va_rdev : 0;
Christoph Hellwig0432dab2005-09-02 16:46:51 +10001977 error = xfs_dir_ialloc(&tp, dp, vap->va_mode, 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 rdev, credp, prid, resblks > 0,
1979 &ip, &committed);
1980 if (error) {
1981 if (error == ENOSPC)
1982 goto error_return;
1983 goto abort_return;
1984 }
1985 ITRACE(ip);
1986
1987 /*
1988 * At this point, we've gotten a newly allocated inode.
1989 * It is locked (and joined to the transaction).
1990 */
1991
1992 ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE));
1993
1994 /*
1995 * Now we join the directory inode to the transaction.
1996 * We do not do it earlier because xfs_dir_ialloc
1997 * might commit the previous transaction (and release
1998 * all the locks).
1999 */
2000
2001 VN_HOLD(dir_vp);
2002 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2003 dp_joined_to_trans = B_TRUE;
2004
2005 error = XFS_DIR_CREATENAME(mp, tp, dp, name, namelen, ip->i_ino,
2006 &first_block, &free_list,
2007 resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
2008 if (error) {
2009 ASSERT(error != ENOSPC);
2010 goto abort_return;
2011 }
2012 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2013 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2014
2015 /*
2016 * If this is a synchronous mount, make sure that the
2017 * create transaction goes to disk before returning to
2018 * the user.
2019 */
2020 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2021 xfs_trans_set_sync(tp);
2022 }
2023
2024 dp->i_gen++;
2025
2026 /*
2027 * Attach the dquot(s) to the inodes and modify them incore.
2028 * These ids of the inode couldn't have changed since the new
2029 * inode has been locked ever since it was created.
2030 */
2031 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
2032
2033 /*
2034 * xfs_trans_commit normally decrements the vnode ref count
2035 * when it unlocks the inode. Since we want to return the
2036 * vnode to the caller, we bump the vnode ref count now.
2037 */
2038 IHOLD(ip);
2039 vp = XFS_ITOV(ip);
2040
2041 error = xfs_bmap_finish(&tp, &free_list, first_block, &committed);
2042 if (error) {
2043 xfs_bmap_cancel(&free_list);
2044 goto abort_rele;
2045 }
2046
2047 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
2048 if (error) {
2049 IRELE(ip);
2050 tp = NULL;
2051 goto error_return;
2052 }
2053
2054 XFS_QM_DQRELE(mp, udqp);
2055 XFS_QM_DQRELE(mp, gdqp);
2056
2057 /*
2058 * Propogate the fact that the vnode changed after the
2059 * xfs_inode locks have been released.
2060 */
2061 VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_TRUNCATED, 3);
2062
2063 *vpp = vp;
2064
2065 /* Fallthrough to std_return with error = 0 */
2066
2067std_return:
2068 if ( (*vpp || (error != 0 && dm_event_sent != 0)) &&
2069 DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp),
2070 DM_EVENT_POSTCREATE)) {
2071 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
2072 dir_vp, DM_RIGHT_NULL,
2073 *vpp ? vp:NULL,
2074 DM_RIGHT_NULL, name, NULL,
2075 dm_di_mode, error, 0);
2076 }
2077 return error;
2078
2079 abort_return:
2080 cancel_flags |= XFS_TRANS_ABORT;
2081 /* FALLTHROUGH */
2082 error_return:
2083
2084 if (tp != NULL)
2085 xfs_trans_cancel(tp, cancel_flags);
2086
2087 if (!dp_joined_to_trans && (dp != NULL))
2088 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2089 XFS_QM_DQRELE(mp, udqp);
2090 XFS_QM_DQRELE(mp, gdqp);
2091
2092 goto std_return;
2093
2094 abort_rele:
2095 /*
2096 * Wait until after the current transaction is aborted to
2097 * release the inode. This prevents recursive transactions
2098 * and deadlocks from xfs_inactive.
2099 */
2100 cancel_flags |= XFS_TRANS_ABORT;
2101 xfs_trans_cancel(tp, cancel_flags);
2102 IRELE(ip);
2103
2104 XFS_QM_DQRELE(mp, udqp);
2105 XFS_QM_DQRELE(mp, gdqp);
2106
2107 goto std_return;
2108}
2109
2110#ifdef DEBUG
2111/*
2112 * Some counters to see if (and how often) we are hitting some deadlock
2113 * prevention code paths.
2114 */
2115
2116int xfs_rm_locks;
2117int xfs_rm_lock_delays;
2118int xfs_rm_attempts;
2119#endif
2120
2121/*
2122 * The following routine will lock the inodes associated with the
2123 * directory and the named entry in the directory. The locks are
2124 * acquired in increasing inode number.
2125 *
2126 * If the entry is "..", then only the directory is locked. The
2127 * vnode ref count will still include that from the .. entry in
2128 * this case.
2129 *
2130 * There is a deadlock we need to worry about. If the locked directory is
2131 * in the AIL, it might be blocking up the log. The next inode we lock
2132 * could be already locked by another thread waiting for log space (e.g
2133 * a permanent log reservation with a long running transaction (see
2134 * xfs_itruncate_finish)). To solve this, we must check if the directory
2135 * is in the ail and use lock_nowait. If we can't lock, we need to
2136 * drop the inode lock on the directory and try again. xfs_iunlock will
2137 * potentially push the tail if we were holding up the log.
2138 */
2139STATIC int
2140xfs_lock_dir_and_entry(
2141 xfs_inode_t *dp,
2142 vname_t *dentry,
2143 xfs_inode_t *ip) /* inode of entry 'name' */
2144{
2145 int attempts;
2146 xfs_ino_t e_inum;
2147 xfs_inode_t *ips[2];
2148 xfs_log_item_t *lp;
2149
2150#ifdef DEBUG
2151 xfs_rm_locks++;
2152#endif
2153 attempts = 0;
2154
2155again:
2156 xfs_ilock(dp, XFS_ILOCK_EXCL);
2157
2158 e_inum = ip->i_ino;
2159
2160 ITRACE(ip);
2161
2162 /*
2163 * We want to lock in increasing inum. Since we've already
2164 * acquired the lock on the directory, we may need to release
2165 * if if the inum of the entry turns out to be less.
2166 */
2167 if (e_inum > dp->i_ino) {
2168 /*
2169 * We are already in the right order, so just
2170 * lock on the inode of the entry.
2171 * We need to use nowait if dp is in the AIL.
2172 */
2173
2174 lp = (xfs_log_item_t *)dp->i_itemp;
2175 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
2176 if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
2177 attempts++;
2178#ifdef DEBUG
2179 xfs_rm_attempts++;
2180#endif
2181
2182 /*
2183 * Unlock dp and try again.
2184 * xfs_iunlock will try to push the tail
2185 * if the inode is in the AIL.
2186 */
2187
2188 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2189
2190 if ((attempts % 5) == 0) {
2191 delay(1); /* Don't just spin the CPU */
2192#ifdef DEBUG
2193 xfs_rm_lock_delays++;
2194#endif
2195 }
2196 goto again;
2197 }
2198 } else {
2199 xfs_ilock(ip, XFS_ILOCK_EXCL);
2200 }
2201 } else if (e_inum < dp->i_ino) {
2202 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2203
2204 ips[0] = ip;
2205 ips[1] = dp;
2206 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
2207 }
2208 /* else e_inum == dp->i_ino */
2209 /* This can happen if we're asked to lock /x/..
2210 * the entry is "..", which is also the parent directory.
2211 */
2212
2213 return 0;
2214}
2215
2216#ifdef DEBUG
2217int xfs_locked_n;
2218int xfs_small_retries;
2219int xfs_middle_retries;
2220int xfs_lots_retries;
2221int xfs_lock_delays;
2222#endif
2223
2224/*
2225 * The following routine will lock n inodes in exclusive mode.
2226 * We assume the caller calls us with the inodes in i_ino order.
2227 *
2228 * We need to detect deadlock where an inode that we lock
2229 * is in the AIL and we start waiting for another inode that is locked
2230 * by a thread in a long running transaction (such as truncate). This can
2231 * result in deadlock since the long running trans might need to wait
2232 * for the inode we just locked in order to push the tail and free space
2233 * in the log.
2234 */
2235void
2236xfs_lock_inodes(
2237 xfs_inode_t **ips,
2238 int inodes,
2239 int first_locked,
2240 uint lock_mode)
2241{
2242 int attempts = 0, i, j, try_lock;
2243 xfs_log_item_t *lp;
2244
2245 ASSERT(ips && (inodes >= 2)); /* we need at least two */
2246
2247 if (first_locked) {
2248 try_lock = 1;
2249 i = 1;
2250 } else {
2251 try_lock = 0;
2252 i = 0;
2253 }
2254
2255again:
2256 for (; i < inodes; i++) {
2257 ASSERT(ips[i]);
2258
2259 if (i && (ips[i] == ips[i-1])) /* Already locked */
2260 continue;
2261
2262 /*
2263 * If try_lock is not set yet, make sure all locked inodes
2264 * are not in the AIL.
2265 * If any are, set try_lock to be used later.
2266 */
2267
2268 if (!try_lock) {
2269 for (j = (i - 1); j >= 0 && !try_lock; j--) {
2270 lp = (xfs_log_item_t *)ips[j]->i_itemp;
2271 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
2272 try_lock++;
2273 }
2274 }
2275 }
2276
2277 /*
2278 * If any of the previous locks we have locked is in the AIL,
2279 * we must TRY to get the second and subsequent locks. If
2280 * we can't get any, we must release all we have
2281 * and try again.
2282 */
2283
2284 if (try_lock) {
2285 /* try_lock must be 0 if i is 0. */
2286 /*
2287 * try_lock means we have an inode locked
2288 * that is in the AIL.
2289 */
2290 ASSERT(i != 0);
2291 if (!xfs_ilock_nowait(ips[i], lock_mode)) {
2292 attempts++;
2293
2294 /*
2295 * Unlock all previous guys and try again.
2296 * xfs_iunlock will try to push the tail
2297 * if the inode is in the AIL.
2298 */
2299
2300 for(j = i - 1; j >= 0; j--) {
2301
2302 /*
2303 * Check to see if we've already
2304 * unlocked this one.
2305 * Not the first one going back,
2306 * and the inode ptr is the same.
2307 */
2308 if ((j != (i - 1)) && ips[j] ==
2309 ips[j+1])
2310 continue;
2311
2312 xfs_iunlock(ips[j], lock_mode);
2313 }
2314
2315 if ((attempts % 5) == 0) {
2316 delay(1); /* Don't just spin the CPU */
2317#ifdef DEBUG
2318 xfs_lock_delays++;
2319#endif
2320 }
2321 i = 0;
2322 try_lock = 0;
2323 goto again;
2324 }
2325 } else {
2326 xfs_ilock(ips[i], lock_mode);
2327 }
2328 }
2329
2330#ifdef DEBUG
2331 if (attempts) {
2332 if (attempts < 5) xfs_small_retries++;
2333 else if (attempts < 100) xfs_middle_retries++;
2334 else xfs_lots_retries++;
2335 } else {
2336 xfs_locked_n++;
2337 }
2338#endif
2339}
2340
2341#ifdef DEBUG
2342#define REMOVE_DEBUG_TRACE(x) {remove_which_error_return = (x);}
2343int remove_which_error_return = 0;
2344#else /* ! DEBUG */
2345#define REMOVE_DEBUG_TRACE(x)
2346#endif /* ! DEBUG */
2347
2348
2349/*
2350 * xfs_remove
2351 *
2352 */
2353STATIC int
2354xfs_remove(
2355 bhv_desc_t *dir_bdp,
2356 vname_t *dentry,
2357 cred_t *credp)
2358{
2359 vnode_t *dir_vp;
2360 char *name = VNAME(dentry);
2361 xfs_inode_t *dp, *ip;
2362 xfs_trans_t *tp = NULL;
2363 xfs_mount_t *mp;
2364 int error = 0;
2365 xfs_bmap_free_t free_list;
2366 xfs_fsblock_t first_block;
2367 int cancel_flags;
2368 int committed;
2369 int dm_di_mode = 0;
2370 int link_zero;
2371 uint resblks;
2372 int namelen;
2373
2374 dir_vp = BHV_TO_VNODE(dir_bdp);
2375 vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address);
2376
2377 dp = XFS_BHVTOI(dir_bdp);
2378 mp = dp->i_mount;
2379
2380 if (XFS_FORCED_SHUTDOWN(mp))
2381 return XFS_ERROR(EIO);
2382
2383 namelen = VNAMELEN(dentry);
2384
2385 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) {
2386 error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp,
2387 DM_RIGHT_NULL, NULL, DM_RIGHT_NULL,
2388 name, NULL, 0, 0, 0);
2389 if (error)
2390 return error;
2391 }
2392
2393 /* From this point on, return through std_return */
2394 ip = NULL;
2395
2396 /*
2397 * We need to get a reference to ip before we get our log
2398 * reservation. The reason for this is that we cannot call
2399 * xfs_iget for an inode for which we do not have a reference
2400 * once we've acquired a log reservation. This is because the
2401 * inode we are trying to get might be in xfs_inactive going
2402 * for a log reservation. Since we'll have to wait for the
2403 * inactive code to complete before returning from xfs_iget,
2404 * we need to make sure that we don't have log space reserved
2405 * when we call xfs_iget. Instead we get an unlocked referece
2406 * to the inode before getting our log reservation.
2407 */
2408 error = xfs_get_dir_entry(dentry, &ip);
2409 if (error) {
2410 REMOVE_DEBUG_TRACE(__LINE__);
2411 goto std_return;
2412 }
2413
2414 dm_di_mode = ip->i_d.di_mode;
2415
2416 vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address);
2417
2418 ITRACE(ip);
2419
2420 error = XFS_QM_DQATTACH(mp, dp, 0);
2421 if (!error && dp != ip)
2422 error = XFS_QM_DQATTACH(mp, ip, 0);
2423 if (error) {
2424 REMOVE_DEBUG_TRACE(__LINE__);
2425 IRELE(ip);
2426 goto std_return;
2427 }
2428
2429 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
2430 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2431 /*
2432 * We try to get the real space reservation first,
2433 * allowing for directory btree deletion(s) implying
2434 * possible bmap insert(s). If we can't get the space
2435 * reservation then we use 0 instead, and avoid the bmap
2436 * btree insert(s) in the directory code by, if the bmap
2437 * insert tries to happen, instead trimming the LAST
2438 * block from the directory.
2439 */
2440 resblks = XFS_REMOVE_SPACE_RES(mp);
2441 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
2442 XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT);
2443 if (error == ENOSPC) {
2444 resblks = 0;
2445 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
2446 XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT);
2447 }
2448 if (error) {
2449 ASSERT(error != ENOSPC);
2450 REMOVE_DEBUG_TRACE(__LINE__);
2451 xfs_trans_cancel(tp, 0);
2452 IRELE(ip);
2453 return error;
2454 }
2455
2456 error = xfs_lock_dir_and_entry(dp, dentry, ip);
2457 if (error) {
2458 REMOVE_DEBUG_TRACE(__LINE__);
2459 xfs_trans_cancel(tp, cancel_flags);
2460 IRELE(ip);
2461 goto std_return;
2462 }
2463
2464 /*
2465 * At this point, we've gotten both the directory and the entry
2466 * inodes locked.
2467 */
2468 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2469 if (dp != ip) {
2470 /*
2471 * Increment vnode ref count only in this case since
2472 * there's an extra vnode reference in the case where
2473 * dp == ip.
2474 */
2475 IHOLD(dp);
2476 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2477 }
2478
2479 /*
2480 * Entry must exist since we did a lookup in xfs_lock_dir_and_entry.
2481 */
2482 XFS_BMAP_INIT(&free_list, &first_block);
2483 error = XFS_DIR_REMOVENAME(mp, tp, dp, name, namelen, ip->i_ino,
2484 &first_block, &free_list, 0);
2485 if (error) {
2486 ASSERT(error != ENOENT);
2487 REMOVE_DEBUG_TRACE(__LINE__);
2488 goto error1;
2489 }
2490 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2491
2492 dp->i_gen++;
2493 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2494
2495 error = xfs_droplink(tp, ip);
2496 if (error) {
2497 REMOVE_DEBUG_TRACE(__LINE__);
2498 goto error1;
2499 }
2500
2501 /* Determine if this is the last link while
2502 * we are in the transaction.
2503 */
2504 link_zero = (ip)->i_d.di_nlink==0;
2505
2506 /*
2507 * Take an extra ref on the inode so that it doesn't
2508 * go to xfs_inactive() from within the commit.
2509 */
2510 IHOLD(ip);
2511
2512 /*
2513 * If this is a synchronous mount, make sure that the
2514 * remove transaction goes to disk before returning to
2515 * the user.
2516 */
2517 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2518 xfs_trans_set_sync(tp);
2519 }
2520
2521 error = xfs_bmap_finish(&tp, &free_list, first_block, &committed);
2522 if (error) {
2523 REMOVE_DEBUG_TRACE(__LINE__);
2524 goto error_rele;
2525 }
2526
2527 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
2528 if (error) {
2529 IRELE(ip);
2530 goto std_return;
2531 }
2532
2533 /*
2534 * Before we drop our extra reference to the inode, purge it
2535 * from the refcache if it is there. By waiting until afterwards
2536 * to do the IRELE, we ensure that we won't go inactive in the
2537 * xfs_refcache_purge_ip routine (although that would be OK).
2538 */
2539 xfs_refcache_purge_ip(ip);
2540
2541 vn_trace_exit(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address);
2542
2543 /*
2544 * Let interposed file systems know about removed links.
2545 */
2546 VOP_LINK_REMOVED(XFS_ITOV(ip), dir_vp, link_zero);
2547
2548 IRELE(ip);
2549
2550/* Fall through to std_return with error = 0 */
2551 std_return:
2552 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp,
2553 DM_EVENT_POSTREMOVE)) {
2554 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE,
2555 dir_vp, DM_RIGHT_NULL,
2556 NULL, DM_RIGHT_NULL,
2557 name, NULL, dm_di_mode, error, 0);
2558 }
2559 return error;
2560
2561 error1:
2562 xfs_bmap_cancel(&free_list);
2563 cancel_flags |= XFS_TRANS_ABORT;
2564 xfs_trans_cancel(tp, cancel_flags);
2565 goto std_return;
2566
2567 error_rele:
2568 /*
2569 * In this case make sure to not release the inode until after
2570 * the current transaction is aborted. Releasing it beforehand
2571 * can cause us to go to xfs_inactive and start a recursive
2572 * transaction which can easily deadlock with the current one.
2573 */
2574 xfs_bmap_cancel(&free_list);
2575 cancel_flags |= XFS_TRANS_ABORT;
2576 xfs_trans_cancel(tp, cancel_flags);
2577
2578 /*
2579 * Before we drop our extra reference to the inode, purge it
2580 * from the refcache if it is there. By waiting until afterwards
2581 * to do the IRELE, we ensure that we won't go inactive in the
2582 * xfs_refcache_purge_ip routine (although that would be OK).
2583 */
2584 xfs_refcache_purge_ip(ip);
2585
2586 IRELE(ip);
2587
2588 goto std_return;
2589}
2590
2591
2592/*
2593 * xfs_link
2594 *
2595 */
2596STATIC int
2597xfs_link(
2598 bhv_desc_t *target_dir_bdp,
2599 vnode_t *src_vp,
2600 vname_t *dentry,
2601 cred_t *credp)
2602{
2603 xfs_inode_t *tdp, *sip;
2604 xfs_trans_t *tp;
2605 xfs_mount_t *mp;
2606 xfs_inode_t *ips[2];
2607 int error;
2608 xfs_bmap_free_t free_list;
2609 xfs_fsblock_t first_block;
2610 int cancel_flags;
2611 int committed;
2612 vnode_t *target_dir_vp;
2613 bhv_desc_t *src_bdp;
2614 int resblks;
2615 char *target_name = VNAME(dentry);
2616 int target_namelen;
2617
2618 target_dir_vp = BHV_TO_VNODE(target_dir_bdp);
2619 vn_trace_entry(target_dir_vp, __FUNCTION__, (inst_t *)__return_address);
2620 vn_trace_entry(src_vp, __FUNCTION__, (inst_t *)__return_address);
2621
2622 target_namelen = VNAMELEN(dentry);
Christoph Hellwig0432dab2005-09-02 16:46:51 +10002623 if (VN_ISDIR(src_vp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002624 return XFS_ERROR(EPERM);
2625
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 src_bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(src_vp), &xfs_vnodeops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 sip = XFS_BHVTOI(src_bdp);
2628 tdp = XFS_BHVTOI(target_dir_bdp);
2629 mp = tdp->i_mount;
2630 if (XFS_FORCED_SHUTDOWN(mp))
2631 return XFS_ERROR(EIO);
2632
2633 if (DM_EVENT_ENABLED(src_vp->v_vfsp, tdp, DM_EVENT_LINK)) {
2634 error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK,
2635 target_dir_vp, DM_RIGHT_NULL,
2636 src_vp, DM_RIGHT_NULL,
2637 target_name, NULL, 0, 0, 0);
2638 if (error)
2639 return error;
2640 }
2641
2642 /* Return through std_return after this point. */
2643
2644 error = XFS_QM_DQATTACH(mp, sip, 0);
2645 if (!error && sip != tdp)
2646 error = XFS_QM_DQATTACH(mp, tdp, 0);
2647 if (error)
2648 goto std_return;
2649
2650 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
2651 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2652 resblks = XFS_LINK_SPACE_RES(mp, target_namelen);
2653 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
2654 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2655 if (error == ENOSPC) {
2656 resblks = 0;
2657 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
2658 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2659 }
2660 if (error) {
2661 cancel_flags = 0;
2662 goto error_return;
2663 }
2664
2665 if (sip->i_ino < tdp->i_ino) {
2666 ips[0] = sip;
2667 ips[1] = tdp;
2668 } else {
2669 ips[0] = tdp;
2670 ips[1] = sip;
2671 }
2672
2673 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
2674
2675 /*
2676 * Increment vnode ref counts since xfs_trans_commit &
2677 * xfs_trans_cancel will both unlock the inodes and
2678 * decrement the associated ref counts.
2679 */
2680 VN_HOLD(src_vp);
2681 VN_HOLD(target_dir_vp);
2682 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
2683 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
2684
2685 /*
2686 * If the source has too many links, we can't make any more to it.
2687 */
2688 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
2689 error = XFS_ERROR(EMLINK);
2690 goto error_return;
2691 }
2692
Nathan Scott365ca832005-06-21 15:39:12 +10002693 /*
2694 * If we are using project inheritance, we only allow hard link
2695 * creation in our tree when the project IDs are the same; else
2696 * the tree quota mechanism could be circumvented.
2697 */
2698 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
2699 (tdp->i_d.di_projid != sip->i_d.di_projid))) {
2700 error = XFS_ERROR(EPERM);
2701 goto error_return;
2702 }
2703
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704 if (resblks == 0 &&
2705 (error = XFS_DIR_CANENTER(mp, tp, tdp, target_name,
2706 target_namelen)))
2707 goto error_return;
2708
2709 XFS_BMAP_INIT(&free_list, &first_block);
2710
2711 error = XFS_DIR_CREATENAME(mp, tp, tdp, target_name, target_namelen,
2712 sip->i_ino, &first_block, &free_list,
2713 resblks);
2714 if (error)
2715 goto abort_return;
2716 xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2717 tdp->i_gen++;
2718 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
2719
2720 error = xfs_bumplink(tp, sip);
2721 if (error) {
2722 goto abort_return;
2723 }
2724
2725 /*
2726 * If this is a synchronous mount, make sure that the
2727 * link transaction goes to disk before returning to
2728 * the user.
2729 */
2730 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2731 xfs_trans_set_sync(tp);
2732 }
2733
2734 error = xfs_bmap_finish (&tp, &free_list, first_block, &committed);
2735 if (error) {
2736 xfs_bmap_cancel(&free_list);
2737 goto abort_return;
2738 }
2739
2740 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
2741 if (error) {
2742 goto std_return;
2743 }
2744
2745 /* Fall through to std_return with error = 0. */
2746std_return:
2747 if (DM_EVENT_ENABLED(src_vp->v_vfsp, sip,
2748 DM_EVENT_POSTLINK)) {
2749 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK,
2750 target_dir_vp, DM_RIGHT_NULL,
2751 src_vp, DM_RIGHT_NULL,
2752 target_name, NULL, 0, error, 0);
2753 }
2754 return error;
2755
2756 abort_return:
2757 cancel_flags |= XFS_TRANS_ABORT;
2758 /* FALLTHROUGH */
2759 error_return:
2760 xfs_trans_cancel(tp, cancel_flags);
2761
2762 goto std_return;
2763}
2764/*
2765 * xfs_mkdir
2766 *
2767 */
2768STATIC int
2769xfs_mkdir(
2770 bhv_desc_t *dir_bdp,
2771 vname_t *dentry,
2772 vattr_t *vap,
2773 vnode_t **vpp,
2774 cred_t *credp)
2775{
2776 char *dir_name = VNAME(dentry);
2777 xfs_inode_t *dp;
2778 xfs_inode_t *cdp; /* inode of created dir */
2779 vnode_t *cvp; /* vnode of created dir */
2780 xfs_trans_t *tp;
2781 xfs_mount_t *mp;
2782 int cancel_flags;
2783 int error;
2784 int committed;
2785 xfs_bmap_free_t free_list;
2786 xfs_fsblock_t first_block;
2787 vnode_t *dir_vp;
2788 boolean_t dp_joined_to_trans;
2789 boolean_t created = B_FALSE;
2790 int dm_event_sent = 0;
2791 xfs_prid_t prid;
2792 struct xfs_dquot *udqp, *gdqp;
2793 uint resblks;
2794 int dm_di_mode;
2795 int dir_namelen;
2796
2797 dir_vp = BHV_TO_VNODE(dir_bdp);
2798 dp = XFS_BHVTOI(dir_bdp);
2799 mp = dp->i_mount;
2800
2801 if (XFS_FORCED_SHUTDOWN(mp))
2802 return XFS_ERROR(EIO);
2803
2804 dir_namelen = VNAMELEN(dentry);
2805
2806 tp = NULL;
2807 dp_joined_to_trans = B_FALSE;
Christoph Hellwig0432dab2005-09-02 16:46:51 +10002808 dm_di_mode = vap->va_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809
2810 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) {
2811 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
2812 dir_vp, DM_RIGHT_NULL, NULL,
2813 DM_RIGHT_NULL, dir_name, NULL,
2814 dm_di_mode, 0, 0);
2815 if (error)
2816 return error;
2817 dm_event_sent = 1;
2818 }
2819
2820 /* Return through std_return after this point. */
2821
2822 vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address);
2823
2824 mp = dp->i_mount;
2825 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10002826 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
2827 prid = dp->i_d.di_projid;
2828 else if (vap->va_mask & XFS_AT_PROJID)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829 prid = (xfs_prid_t)vap->va_projid;
2830 else
2831 prid = (xfs_prid_t)dfltprid;
2832
2833 /*
2834 * Make sure that we have allocated dquot(s) on disk.
2835 */
2836 error = XFS_QM_DQVOPALLOC(mp, dp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002837 current_fsuid(credp), current_fsgid(credp), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002838 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
2839 if (error)
2840 goto std_return;
2841
2842 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
2843 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2844 resblks = XFS_MKDIR_SPACE_RES(mp, dir_namelen);
2845 error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0,
2846 XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT);
2847 if (error == ENOSPC) {
2848 resblks = 0;
2849 error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0,
2850 XFS_TRANS_PERM_LOG_RES,
2851 XFS_MKDIR_LOG_COUNT);
2852 }
2853 if (error) {
2854 cancel_flags = 0;
2855 dp = NULL;
2856 goto error_return;
2857 }
2858
2859 xfs_ilock(dp, XFS_ILOCK_EXCL);
2860
2861 /*
2862 * Check for directory link count overflow.
2863 */
2864 if (dp->i_d.di_nlink >= XFS_MAXLINK) {
2865 error = XFS_ERROR(EMLINK);
2866 goto error_return;
2867 }
2868
2869 /*
2870 * Reserve disk quota and the inode.
2871 */
2872 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
2873 if (error)
2874 goto error_return;
2875
2876 if (resblks == 0 &&
2877 (error = XFS_DIR_CANENTER(mp, tp, dp, dir_name, dir_namelen)))
2878 goto error_return;
2879 /*
2880 * create the directory inode.
2881 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +10002882 error = xfs_dir_ialloc(&tp, dp, vap->va_mode, 2,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002883 0, credp, prid, resblks > 0,
2884 &cdp, NULL);
2885 if (error) {
2886 if (error == ENOSPC)
2887 goto error_return;
2888 goto abort_return;
2889 }
2890 ITRACE(cdp);
2891
2892 /*
2893 * Now we add the directory inode to the transaction.
2894 * We waited until now since xfs_dir_ialloc might start
2895 * a new transaction. Had we joined the transaction
2896 * earlier, the locks might have gotten released.
2897 */
2898 VN_HOLD(dir_vp);
2899 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2900 dp_joined_to_trans = B_TRUE;
2901
2902 XFS_BMAP_INIT(&free_list, &first_block);
2903
2904 error = XFS_DIR_CREATENAME(mp, tp, dp, dir_name, dir_namelen,
2905 cdp->i_ino, &first_block, &free_list,
2906 resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
2907 if (error) {
2908 ASSERT(error != ENOSPC);
2909 goto error1;
2910 }
2911 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2912
2913 /*
2914 * Bump the in memory version number of the parent directory
2915 * so that other processes accessing it will recognize that
2916 * the directory has changed.
2917 */
2918 dp->i_gen++;
2919
2920 error = XFS_DIR_INIT(mp, tp, cdp, dp);
2921 if (error) {
2922 goto error2;
2923 }
2924
2925 cdp->i_gen = 1;
2926 error = xfs_bumplink(tp, dp);
2927 if (error) {
2928 goto error2;
2929 }
2930
2931 cvp = XFS_ITOV(cdp);
2932
2933 created = B_TRUE;
2934
2935 *vpp = cvp;
2936 IHOLD(cdp);
2937
2938 /*
2939 * Attach the dquots to the new inode and modify the icount incore.
2940 */
2941 XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp);
2942
2943 /*
2944 * If this is a synchronous mount, make sure that the
2945 * mkdir transaction goes to disk before returning to
2946 * the user.
2947 */
2948 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2949 xfs_trans_set_sync(tp);
2950 }
2951
2952 error = xfs_bmap_finish(&tp, &free_list, first_block, &committed);
2953 if (error) {
2954 IRELE(cdp);
2955 goto error2;
2956 }
2957
2958 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
2959 XFS_QM_DQRELE(mp, udqp);
2960 XFS_QM_DQRELE(mp, gdqp);
2961 if (error) {
2962 IRELE(cdp);
2963 }
2964
2965 /* Fall through to std_return with error = 0 or errno from
2966 * xfs_trans_commit. */
2967
2968std_return:
2969 if ( (created || (error != 0 && dm_event_sent != 0)) &&
2970 DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp),
2971 DM_EVENT_POSTCREATE)) {
2972 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
2973 dir_vp, DM_RIGHT_NULL,
2974 created ? XFS_ITOV(cdp):NULL,
2975 DM_RIGHT_NULL,
2976 dir_name, NULL,
2977 dm_di_mode, error, 0);
2978 }
2979 return error;
2980
2981 error2:
2982 error1:
2983 xfs_bmap_cancel(&free_list);
2984 abort_return:
2985 cancel_flags |= XFS_TRANS_ABORT;
2986 error_return:
2987 xfs_trans_cancel(tp, cancel_flags);
2988 XFS_QM_DQRELE(mp, udqp);
2989 XFS_QM_DQRELE(mp, gdqp);
2990
2991 if (!dp_joined_to_trans && (dp != NULL)) {
2992 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2993 }
2994
2995 goto std_return;
2996}
2997
2998
2999/*
3000 * xfs_rmdir
3001 *
3002 */
3003STATIC int
3004xfs_rmdir(
3005 bhv_desc_t *dir_bdp,
3006 vname_t *dentry,
3007 cred_t *credp)
3008{
3009 char *name = VNAME(dentry);
3010 xfs_inode_t *dp;
3011 xfs_inode_t *cdp; /* child directory */
3012 xfs_trans_t *tp;
3013 xfs_mount_t *mp;
3014 int error;
3015 xfs_bmap_free_t free_list;
3016 xfs_fsblock_t first_block;
3017 int cancel_flags;
3018 int committed;
3019 vnode_t *dir_vp;
3020 int dm_di_mode = 0;
3021 int last_cdp_link;
3022 int namelen;
3023 uint resblks;
3024
3025 dir_vp = BHV_TO_VNODE(dir_bdp);
3026 dp = XFS_BHVTOI(dir_bdp);
3027 mp = dp->i_mount;
3028
3029 vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address);
3030
3031 if (XFS_FORCED_SHUTDOWN(XFS_BHVTOI(dir_bdp)->i_mount))
3032 return XFS_ERROR(EIO);
3033 namelen = VNAMELEN(dentry);
3034
3035 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) {
3036 error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE,
3037 dir_vp, DM_RIGHT_NULL,
3038 NULL, DM_RIGHT_NULL,
3039 name, NULL, 0, 0, 0);
3040 if (error)
3041 return XFS_ERROR(error);
3042 }
3043
3044 /* Return through std_return after this point. */
3045
3046 cdp = NULL;
3047
3048 /*
3049 * We need to get a reference to cdp before we get our log
3050 * reservation. The reason for this is that we cannot call
3051 * xfs_iget for an inode for which we do not have a reference
3052 * once we've acquired a log reservation. This is because the
3053 * inode we are trying to get might be in xfs_inactive going
3054 * for a log reservation. Since we'll have to wait for the
3055 * inactive code to complete before returning from xfs_iget,
3056 * we need to make sure that we don't have log space reserved
3057 * when we call xfs_iget. Instead we get an unlocked referece
3058 * to the inode before getting our log reservation.
3059 */
3060 error = xfs_get_dir_entry(dentry, &cdp);
3061 if (error) {
3062 REMOVE_DEBUG_TRACE(__LINE__);
3063 goto std_return;
3064 }
3065 mp = dp->i_mount;
3066 dm_di_mode = cdp->i_d.di_mode;
3067
3068 /*
3069 * Get the dquots for the inodes.
3070 */
3071 error = XFS_QM_DQATTACH(mp, dp, 0);
3072 if (!error && dp != cdp)
3073 error = XFS_QM_DQATTACH(mp, cdp, 0);
3074 if (error) {
3075 IRELE(cdp);
3076 REMOVE_DEBUG_TRACE(__LINE__);
3077 goto std_return;
3078 }
3079
3080 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
3081 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
3082 /*
3083 * We try to get the real space reservation first,
3084 * allowing for directory btree deletion(s) implying
3085 * possible bmap insert(s). If we can't get the space
3086 * reservation then we use 0 instead, and avoid the bmap
3087 * btree insert(s) in the directory code by, if the bmap
3088 * insert tries to happen, instead trimming the LAST
3089 * block from the directory.
3090 */
3091 resblks = XFS_REMOVE_SPACE_RES(mp);
3092 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
3093 XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT);
3094 if (error == ENOSPC) {
3095 resblks = 0;
3096 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
3097 XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT);
3098 }
3099 if (error) {
3100 ASSERT(error != ENOSPC);
3101 cancel_flags = 0;
3102 IRELE(cdp);
3103 goto error_return;
3104 }
3105 XFS_BMAP_INIT(&free_list, &first_block);
3106
3107 /*
3108 * Now lock the child directory inode and the parent directory
3109 * inode in the proper order. This will take care of validating
3110 * that the directory entry for the child directory inode has
3111 * not changed while we were obtaining a log reservation.
3112 */
3113 error = xfs_lock_dir_and_entry(dp, dentry, cdp);
3114 if (error) {
3115 xfs_trans_cancel(tp, cancel_flags);
3116 IRELE(cdp);
3117 goto std_return;
3118 }
3119
3120 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
3121 if (dp != cdp) {
3122 /*
3123 * Only increment the parent directory vnode count if
3124 * we didn't bump it in looking up cdp. The only time
3125 * we don't bump it is when we're looking up ".".
3126 */
3127 VN_HOLD(dir_vp);
3128 }
3129
3130 ITRACE(cdp);
3131 xfs_trans_ijoin(tp, cdp, XFS_ILOCK_EXCL);
3132
3133 ASSERT(cdp->i_d.di_nlink >= 2);
3134 if (cdp->i_d.di_nlink != 2) {
3135 error = XFS_ERROR(ENOTEMPTY);
3136 goto error_return;
3137 }
3138 if (!XFS_DIR_ISEMPTY(mp, cdp)) {
3139 error = XFS_ERROR(ENOTEMPTY);
3140 goto error_return;
3141 }
3142
3143 error = XFS_DIR_REMOVENAME(mp, tp, dp, name, namelen, cdp->i_ino,
3144 &first_block, &free_list, resblks);
3145 if (error) {
3146 goto error1;
3147 }
3148
3149 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3150
3151 /*
3152 * Bump the in memory generation count on the parent
3153 * directory so that other can know that it has changed.
3154 */
3155 dp->i_gen++;
3156
3157 /*
3158 * Drop the link from cdp's "..".
3159 */
3160 error = xfs_droplink(tp, dp);
3161 if (error) {
3162 goto error1;
3163 }
3164
3165 /*
3166 * Drop the link from dp to cdp.
3167 */
3168 error = xfs_droplink(tp, cdp);
3169 if (error) {
3170 goto error1;
3171 }
3172
3173 /*
3174 * Drop the "." link from cdp to self.
3175 */
3176 error = xfs_droplink(tp, cdp);
3177 if (error) {
3178 goto error1;
3179 }
3180
3181 /* Determine these before committing transaction */
3182 last_cdp_link = (cdp)->i_d.di_nlink==0;
3183
3184 /*
3185 * Take an extra ref on the child vnode so that it
3186 * does not go to xfs_inactive() from within the commit.
3187 */
3188 IHOLD(cdp);
3189
3190 /*
3191 * If this is a synchronous mount, make sure that the
3192 * rmdir transaction goes to disk before returning to
3193 * the user.
3194 */
3195 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
3196 xfs_trans_set_sync(tp);
3197 }
3198
3199 error = xfs_bmap_finish (&tp, &free_list, first_block, &committed);
3200 if (error) {
3201 xfs_bmap_cancel(&free_list);
3202 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
3203 XFS_TRANS_ABORT));
3204 IRELE(cdp);
3205 goto std_return;
3206 }
3207
3208 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
3209 if (error) {
3210 IRELE(cdp);
3211 goto std_return;
3212 }
3213
3214
3215 /*
3216 * Let interposed file systems know about removed links.
3217 */
3218 VOP_LINK_REMOVED(XFS_ITOV(cdp), dir_vp, last_cdp_link);
3219
3220 IRELE(cdp);
3221
3222 /* Fall through to std_return with error = 0 or the errno
3223 * from xfs_trans_commit. */
3224std_return:
3225 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_POSTREMOVE)) {
3226 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE,
3227 dir_vp, DM_RIGHT_NULL,
3228 NULL, DM_RIGHT_NULL,
3229 name, NULL, dm_di_mode,
3230 error, 0);
3231 }
3232 return error;
3233
3234 error1:
3235 xfs_bmap_cancel(&free_list);
3236 cancel_flags |= XFS_TRANS_ABORT;
3237 error_return:
3238 xfs_trans_cancel(tp, cancel_flags);
3239 goto std_return;
3240}
3241
3242
3243/*
3244 * xfs_readdir
3245 *
3246 * Read dp's entries starting at uiop->uio_offset and translate them into
3247 * bufsize bytes worth of struct dirents starting at bufbase.
3248 */
3249STATIC int
3250xfs_readdir(
3251 bhv_desc_t *dir_bdp,
3252 uio_t *uiop,
3253 cred_t *credp,
3254 int *eofp)
3255{
3256 xfs_inode_t *dp;
3257 xfs_trans_t *tp = NULL;
3258 int error = 0;
3259 uint lock_mode;
3260 xfs_off_t start_offset;
3261
3262 vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__,
3263 (inst_t *)__return_address);
3264 dp = XFS_BHVTOI(dir_bdp);
3265
3266 if (XFS_FORCED_SHUTDOWN(dp->i_mount)) {
3267 return XFS_ERROR(EIO);
3268 }
3269
3270 lock_mode = xfs_ilock_map_shared(dp);
3271 start_offset = uiop->uio_offset;
3272 error = XFS_DIR_GETDENTS(dp->i_mount, tp, dp, uiop, eofp);
3273 if (start_offset != uiop->uio_offset) {
3274 xfs_ichgtime(dp, XFS_ICHGTIME_ACC);
3275 }
3276 xfs_iunlock_map_shared(dp, lock_mode);
3277 return error;
3278}
3279
3280
3281/*
3282 * xfs_symlink
3283 *
3284 */
3285STATIC int
3286xfs_symlink(
3287 bhv_desc_t *dir_bdp,
3288 vname_t *dentry,
3289 vattr_t *vap,
3290 char *target_path,
3291 vnode_t **vpp,
3292 cred_t *credp)
3293{
3294 xfs_trans_t *tp;
3295 xfs_mount_t *mp;
3296 xfs_inode_t *dp;
3297 xfs_inode_t *ip;
3298 int error;
3299 int pathlen;
3300 xfs_bmap_free_t free_list;
3301 xfs_fsblock_t first_block;
3302 boolean_t dp_joined_to_trans;
3303 vnode_t *dir_vp;
3304 uint cancel_flags;
3305 int committed;
3306 xfs_fileoff_t first_fsb;
3307 xfs_filblks_t fs_blocks;
3308 int nmaps;
3309 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
3310 xfs_daddr_t d;
3311 char *cur_chunk;
3312 int byte_cnt;
3313 int n;
3314 xfs_buf_t *bp;
3315 xfs_prid_t prid;
3316 struct xfs_dquot *udqp, *gdqp;
3317 uint resblks;
3318 char *link_name = VNAME(dentry);
3319 int link_namelen;
3320
3321 *vpp = NULL;
3322 dir_vp = BHV_TO_VNODE(dir_bdp);
3323 dp = XFS_BHVTOI(dir_bdp);
3324 dp_joined_to_trans = B_FALSE;
3325 error = 0;
3326 ip = NULL;
3327 tp = NULL;
3328
3329 vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address);
3330
3331 mp = dp->i_mount;
3332
3333 if (XFS_FORCED_SHUTDOWN(mp))
3334 return XFS_ERROR(EIO);
3335
3336 link_namelen = VNAMELEN(dentry);
3337
3338 /*
3339 * Check component lengths of the target path name.
3340 */
3341 pathlen = strlen(target_path);
3342 if (pathlen >= MAXPATHLEN) /* total string too long */
3343 return XFS_ERROR(ENAMETOOLONG);
3344 if (pathlen >= MAXNAMELEN) { /* is any component too long? */
3345 int len, total;
3346 char *path;
3347
3348 for(total = 0, path = target_path; total < pathlen;) {
3349 /*
3350 * Skip any slashes.
3351 */
3352 while(*path == '/') {
3353 total++;
3354 path++;
3355 }
3356
3357 /*
3358 * Count up to the next slash or end of path.
3359 * Error out if the component is bigger than MAXNAMELEN.
3360 */
3361 for(len = 0; *path != '/' && total < pathlen;total++, path++) {
3362 if (++len >= MAXNAMELEN) {
3363 error = ENAMETOOLONG;
3364 return error;
3365 }
3366 }
3367 }
3368 }
3369
3370 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_SYMLINK)) {
3371 error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dir_vp,
3372 DM_RIGHT_NULL, NULL, DM_RIGHT_NULL,
3373 link_name, target_path, 0, 0, 0);
3374 if (error)
3375 return error;
3376 }
3377
3378 /* Return through std_return after this point. */
3379
3380 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10003381 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
3382 prid = dp->i_d.di_projid;
3383 else if (vap->va_mask & XFS_AT_PROJID)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003384 prid = (xfs_prid_t)vap->va_projid;
3385 else
3386 prid = (xfs_prid_t)dfltprid;
3387
3388 /*
3389 * Make sure that we have allocated dquot(s) on disk.
3390 */
3391 error = XFS_QM_DQVOPALLOC(mp, dp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10003392 current_fsuid(credp), current_fsgid(credp), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003393 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
3394 if (error)
3395 goto std_return;
3396
3397 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
3398 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
3399 /*
3400 * The symlink will fit into the inode data fork?
3401 * There can't be any attributes so we get the whole variable part.
3402 */
3403 if (pathlen <= XFS_LITINO(mp))
3404 fs_blocks = 0;
3405 else
3406 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
3407 resblks = XFS_SYMLINK_SPACE_RES(mp, link_namelen, fs_blocks);
3408 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
3409 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
3410 if (error == ENOSPC && fs_blocks == 0) {
3411 resblks = 0;
3412 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
3413 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
3414 }
3415 if (error) {
3416 cancel_flags = 0;
3417 dp = NULL;
3418 goto error_return;
3419 }
3420
3421 xfs_ilock(dp, XFS_ILOCK_EXCL);
3422
3423 /*
3424 * Check whether the directory allows new symlinks or not.
3425 */
3426 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
3427 error = XFS_ERROR(EPERM);
3428 goto error_return;
3429 }
3430
3431 /*
3432 * Reserve disk quota : blocks and inode.
3433 */
3434 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
3435 if (error)
3436 goto error_return;
3437
3438 /*
3439 * Check for ability to enter directory entry, if no space reserved.
3440 */
3441 if (resblks == 0 &&
3442 (error = XFS_DIR_CANENTER(mp, tp, dp, link_name, link_namelen)))
3443 goto error_return;
3444 /*
3445 * Initialize the bmap freelist prior to calling either
3446 * bmapi or the directory create code.
3447 */
3448 XFS_BMAP_INIT(&free_list, &first_block);
3449
3450 /*
3451 * Allocate an inode for the symlink.
3452 */
3453 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (vap->va_mode&~S_IFMT),
3454 1, 0, credp, prid, resblks > 0, &ip, NULL);
3455 if (error) {
3456 if (error == ENOSPC)
3457 goto error_return;
3458 goto error1;
3459 }
3460 ITRACE(ip);
3461
3462 VN_HOLD(dir_vp);
3463 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
3464 dp_joined_to_trans = B_TRUE;
3465
3466 /*
3467 * Also attach the dquot(s) to it, if applicable.
3468 */
3469 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
3470
3471 if (resblks)
3472 resblks -= XFS_IALLOC_SPACE_RES(mp);
3473 /*
3474 * If the symlink will fit into the inode, write it inline.
3475 */
3476 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
3477 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
3478 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
3479 ip->i_d.di_size = pathlen;
3480
3481 /*
3482 * The inode was initially created in extent format.
3483 */
3484 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
3485 ip->i_df.if_flags |= XFS_IFINLINE;
3486
3487 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
3488 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
3489
3490 } else {
3491 first_fsb = 0;
3492 nmaps = SYMLINK_MAPS;
3493
3494 error = xfs_bmapi(tp, ip, first_fsb, fs_blocks,
3495 XFS_BMAPI_WRITE | XFS_BMAPI_METADATA,
3496 &first_block, resblks, mval, &nmaps,
3497 &free_list);
3498 if (error) {
3499 goto error1;
3500 }
3501
3502 if (resblks)
3503 resblks -= fs_blocks;
3504 ip->i_d.di_size = pathlen;
3505 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3506
3507 cur_chunk = target_path;
3508 for (n = 0; n < nmaps; n++) {
3509 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
3510 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
3511 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
3512 BTOBB(byte_cnt), 0);
3513 ASSERT(bp && !XFS_BUF_GETERROR(bp));
3514 if (pathlen < byte_cnt) {
3515 byte_cnt = pathlen;
3516 }
3517 pathlen -= byte_cnt;
3518
3519 memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt);
3520 cur_chunk += byte_cnt;
3521
3522 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
3523 }
3524 }
3525
3526 /*
3527 * Create the directory entry for the symlink.
3528 */
3529 error = XFS_DIR_CREATENAME(mp, tp, dp, link_name, link_namelen,
3530 ip->i_ino, &first_block, &free_list, resblks);
3531 if (error) {
3532 goto error1;
3533 }
3534 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3535 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
3536
3537 /*
3538 * Bump the in memory version number of the parent directory
3539 * so that other processes accessing it will recognize that
3540 * the directory has changed.
3541 */
3542 dp->i_gen++;
3543
3544 /*
3545 * If this is a synchronous mount, make sure that the
3546 * symlink transaction goes to disk before returning to
3547 * the user.
3548 */
3549 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
3550 xfs_trans_set_sync(tp);
3551 }
3552
3553 /*
3554 * xfs_trans_commit normally decrements the vnode ref count
3555 * when it unlocks the inode. Since we want to return the
3556 * vnode to the caller, we bump the vnode ref count now.
3557 */
3558 IHOLD(ip);
3559
3560 error = xfs_bmap_finish(&tp, &free_list, first_block, &committed);
3561 if (error) {
3562 goto error2;
3563 }
3564 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
3565 XFS_QM_DQRELE(mp, udqp);
3566 XFS_QM_DQRELE(mp, gdqp);
3567
3568 /* Fall through to std_return with error = 0 or errno from
3569 * xfs_trans_commit */
3570std_return:
3571 if (DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp),
3572 DM_EVENT_POSTSYMLINK)) {
3573 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK,
3574 dir_vp, DM_RIGHT_NULL,
3575 error ? NULL : XFS_ITOV(ip),
3576 DM_RIGHT_NULL, link_name, target_path,
3577 0, error, 0);
3578 }
3579
3580 if (!error) {
3581 vnode_t *vp;
3582
3583 ASSERT(ip);
3584 vp = XFS_ITOV(ip);
3585 *vpp = vp;
3586 }
3587 return error;
3588
3589 error2:
3590 IRELE(ip);
3591 error1:
3592 xfs_bmap_cancel(&free_list);
3593 cancel_flags |= XFS_TRANS_ABORT;
3594 error_return:
3595 xfs_trans_cancel(tp, cancel_flags);
3596 XFS_QM_DQRELE(mp, udqp);
3597 XFS_QM_DQRELE(mp, gdqp);
3598
3599 if (!dp_joined_to_trans && (dp != NULL)) {
3600 xfs_iunlock(dp, XFS_ILOCK_EXCL);
3601 }
3602
3603 goto std_return;
3604}
3605
3606
3607/*
3608 * xfs_fid2
3609 *
3610 * A fid routine that takes a pointer to a previously allocated
3611 * fid structure (like xfs_fast_fid) but uses a 64 bit inode number.
3612 */
3613STATIC int
3614xfs_fid2(
3615 bhv_desc_t *bdp,
3616 fid_t *fidp)
3617{
3618 xfs_inode_t *ip;
3619 xfs_fid2_t *xfid;
3620
3621 vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__,
3622 (inst_t *)__return_address);
3623 ASSERT(sizeof(fid_t) >= sizeof(xfs_fid2_t));
3624
3625 xfid = (xfs_fid2_t *)fidp;
3626 ip = XFS_BHVTOI(bdp);
3627 xfid->fid_len = sizeof(xfs_fid2_t) - sizeof(xfid->fid_len);
3628 xfid->fid_pad = 0;
3629 /*
3630 * use memcpy because the inode is a long long and there's no
3631 * assurance that xfid->fid_ino is properly aligned.
3632 */
3633 memcpy(&xfid->fid_ino, &ip->i_ino, sizeof(xfid->fid_ino));
3634 xfid->fid_gen = ip->i_d.di_gen;
3635
3636 return 0;
3637}
3638
3639
3640/*
3641 * xfs_rwlock
3642 */
3643int
3644xfs_rwlock(
3645 bhv_desc_t *bdp,
3646 vrwlock_t locktype)
3647{
3648 xfs_inode_t *ip;
3649 vnode_t *vp;
3650
3651 vp = BHV_TO_VNODE(bdp);
Christoph Hellwig0432dab2005-09-02 16:46:51 +10003652 if (VN_ISDIR(vp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003653 return 1;
3654 ip = XFS_BHVTOI(bdp);
3655 if (locktype == VRWLOCK_WRITE) {
3656 xfs_ilock(ip, XFS_IOLOCK_EXCL);
3657 } else if (locktype == VRWLOCK_TRY_READ) {
3658 return (xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED));
3659 } else if (locktype == VRWLOCK_TRY_WRITE) {
3660 return (xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL));
3661 } else {
3662 ASSERT((locktype == VRWLOCK_READ) ||
3663 (locktype == VRWLOCK_WRITE_DIRECT));
3664 xfs_ilock(ip, XFS_IOLOCK_SHARED);
3665 }
3666
3667 return 1;
3668}
3669
3670
3671/*
3672 * xfs_rwunlock
3673 */
3674void
3675xfs_rwunlock(
3676 bhv_desc_t *bdp,
3677 vrwlock_t locktype)
3678{
3679 xfs_inode_t *ip;
3680 vnode_t *vp;
3681
3682 vp = BHV_TO_VNODE(bdp);
Christoph Hellwig0432dab2005-09-02 16:46:51 +10003683 if (VN_ISDIR(vp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003684 return;
3685 ip = XFS_BHVTOI(bdp);
3686 if (locktype == VRWLOCK_WRITE) {
3687 /*
3688 * In the write case, we may have added a new entry to
3689 * the reference cache. This might store a pointer to
3690 * an inode to be released in this inode. If it is there,
3691 * clear the pointer and release the inode after unlocking
3692 * this one.
3693 */
3694 xfs_refcache_iunlock(ip, XFS_IOLOCK_EXCL);
3695 } else {
3696 ASSERT((locktype == VRWLOCK_READ) ||
3697 (locktype == VRWLOCK_WRITE_DIRECT));
3698 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
3699 }
3700 return;
3701}
3702
3703STATIC int
3704xfs_inode_flush(
3705 bhv_desc_t *bdp,
3706 int flags)
3707{
3708 xfs_inode_t *ip;
3709 xfs_mount_t *mp;
3710 xfs_inode_log_item_t *iip;
3711 int error = 0;
3712
3713 ip = XFS_BHVTOI(bdp);
3714 mp = ip->i_mount;
3715 iip = ip->i_itemp;
3716
3717 if (XFS_FORCED_SHUTDOWN(mp))
3718 return XFS_ERROR(EIO);
3719
3720 /*
3721 * Bypass inodes which have already been cleaned by
3722 * the inode flush clustering code inside xfs_iflush
3723 */
3724 if ((ip->i_update_core == 0) &&
3725 ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL)))
3726 return 0;
3727
3728 if (flags & FLUSH_LOG) {
3729 if (iip && iip->ili_last_lsn) {
3730 xlog_t *log = mp->m_log;
3731 xfs_lsn_t sync_lsn;
3732 int s, log_flags = XFS_LOG_FORCE;
3733
3734 s = GRANT_LOCK(log);
3735 sync_lsn = log->l_last_sync_lsn;
3736 GRANT_UNLOCK(log, s);
3737
3738 if ((XFS_LSN_CMP(iip->ili_last_lsn, sync_lsn) <= 0))
3739 return 0;
3740
3741 if (flags & FLUSH_SYNC)
3742 log_flags |= XFS_LOG_SYNC;
3743 return xfs_log_force(mp, iip->ili_last_lsn, log_flags);
3744 }
3745 }
3746
3747 /*
3748 * We make this non-blocking if the inode is contended,
3749 * return EAGAIN to indicate to the caller that they
3750 * did not succeed. This prevents the flush path from
3751 * blocking on inodes inside another operation right
3752 * now, they get caught later by xfs_sync.
3753 */
3754 if (flags & FLUSH_INODE) {
3755 int flush_flags;
3756
3757 if (xfs_ipincount(ip))
3758 return EAGAIN;
3759
3760 if (flags & FLUSH_SYNC) {
3761 xfs_ilock(ip, XFS_ILOCK_SHARED);
3762 xfs_iflock(ip);
3763 } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
3764 if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) {
3765 xfs_iunlock(ip, XFS_ILOCK_SHARED);
3766 return EAGAIN;
3767 }
3768 } else {
3769 return EAGAIN;
3770 }
3771
3772 if (flags & FLUSH_SYNC)
3773 flush_flags = XFS_IFLUSH_SYNC;
3774 else
3775 flush_flags = XFS_IFLUSH_ASYNC;
3776
3777 error = xfs_iflush(ip, flush_flags);
3778 xfs_iunlock(ip, XFS_ILOCK_SHARED);
3779 }
3780
3781 return error;
3782}
3783
3784
3785int
3786xfs_set_dmattrs (
3787 bhv_desc_t *bdp,
3788 u_int evmask,
3789 u_int16_t state,
3790 cred_t *credp)
3791{
3792 xfs_inode_t *ip;
3793 xfs_trans_t *tp;
3794 xfs_mount_t *mp;
3795 int error;
3796
3797 if (!capable(CAP_SYS_ADMIN))
3798 return XFS_ERROR(EPERM);
3799
3800 ip = XFS_BHVTOI(bdp);
3801 mp = ip->i_mount;
3802
3803 if (XFS_FORCED_SHUTDOWN(mp))
3804 return XFS_ERROR(EIO);
3805
3806 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
3807 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
3808 if (error) {
3809 xfs_trans_cancel(tp, 0);
3810 return error;
3811 }
3812 xfs_ilock(ip, XFS_ILOCK_EXCL);
3813 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3814
3815 ip->i_iocore.io_dmevmask = ip->i_d.di_dmevmask = evmask;
3816 ip->i_iocore.io_dmstate = ip->i_d.di_dmstate = state;
3817
3818 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3819 IHOLD(ip);
3820 error = xfs_trans_commit(tp, 0, NULL);
3821
3822 return error;
3823}
3824
3825
3826/*
3827 * xfs_reclaim
3828 */
3829STATIC int
3830xfs_reclaim(
3831 bhv_desc_t *bdp)
3832{
3833 xfs_inode_t *ip;
3834 vnode_t *vp;
3835
3836 vp = BHV_TO_VNODE(bdp);
3837 ip = XFS_BHVTOI(bdp);
3838
3839 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
3840
3841 ASSERT(!VN_MAPPED(vp));
3842
3843 /* bad inode, get out here ASAP */
3844 if (VN_BAD(vp)) {
3845 xfs_ireclaim(ip);
3846 return 0;
3847 }
3848
Christoph Hellwig51c91ed2005-09-02 16:58:38 +10003849 vn_iowait(vp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003850
Christoph Hellwig51c91ed2005-09-02 16:58:38 +10003851 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
3852 ASSERT(VN_CACHED(vp) == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003853
3854 /* If we have nothing to flush with this inode then complete the
3855 * teardown now, otherwise break the link between the xfs inode
3856 * and the linux inode and clean up the xfs inode later. This
3857 * avoids flushing the inode to disk during the delete operation
3858 * itself.
3859 */
3860 if (!ip->i_update_core && (ip->i_itemp == NULL)) {
3861 xfs_ilock(ip, XFS_ILOCK_EXCL);
3862 xfs_iflock(ip);
3863 return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC);
3864 } else {
3865 xfs_mount_t *mp = ip->i_mount;
3866
3867 /* Protect sync from us */
3868 XFS_MOUNT_ILOCK(mp);
3869 vn_bhv_remove(VN_BHV_HEAD(vp), XFS_ITOBHV(ip));
3870 list_add_tail(&ip->i_reclaim, &mp->m_del_inodes);
3871 ip->i_flags |= XFS_IRECLAIMABLE;
3872 XFS_MOUNT_IUNLOCK(mp);
3873 }
3874 return 0;
3875}
3876
3877int
3878xfs_finish_reclaim(
3879 xfs_inode_t *ip,
3880 int locked,
3881 int sync_mode)
3882{
3883 xfs_ihash_t *ih = ip->i_hash;
3884 vnode_t *vp = XFS_ITOV_NULL(ip);
3885 int error;
3886
3887 if (vp && VN_BAD(vp))
3888 goto reclaim;
3889
3890 /* The hash lock here protects a thread in xfs_iget_core from
3891 * racing with us on linking the inode back with a vnode.
3892 * Once we have the XFS_IRECLAIM flag set it will not touch
3893 * us.
3894 */
3895 write_lock(&ih->ih_lock);
3896 if ((ip->i_flags & XFS_IRECLAIM) ||
3897 (!(ip->i_flags & XFS_IRECLAIMABLE) && vp == NULL)) {
3898 write_unlock(&ih->ih_lock);
3899 if (locked) {
3900 xfs_ifunlock(ip);
3901 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3902 }
3903 return(1);
3904 }
3905 ip->i_flags |= XFS_IRECLAIM;
3906 write_unlock(&ih->ih_lock);
3907
3908 /*
3909 * If the inode is still dirty, then flush it out. If the inode
3910 * is not in the AIL, then it will be OK to flush it delwri as
3911 * long as xfs_iflush() does not keep any references to the inode.
3912 * We leave that decision up to xfs_iflush() since it has the
3913 * knowledge of whether it's OK to simply do a delwri flush of
3914 * the inode or whether we need to wait until the inode is
3915 * pulled from the AIL.
3916 * We get the flush lock regardless, though, just to make sure
3917 * we don't free it while it is being flushed.
3918 */
3919 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
3920 if (!locked) {
3921 xfs_ilock(ip, XFS_ILOCK_EXCL);
3922 xfs_iflock(ip);
3923 }
3924
3925 if (ip->i_update_core ||
3926 ((ip->i_itemp != NULL) &&
3927 (ip->i_itemp->ili_format.ilf_fields != 0))) {
3928 error = xfs_iflush(ip, sync_mode);
3929 /*
3930 * If we hit an error, typically because of filesystem
3931 * shutdown, we don't need to let vn_reclaim to know
3932 * because we're gonna reclaim the inode anyway.
3933 */
3934 if (error) {
3935 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3936 goto reclaim;
3937 }
3938 xfs_iflock(ip); /* synchronize with xfs_iflush_done */
3939 }
3940
3941 ASSERT(ip->i_update_core == 0);
3942 ASSERT(ip->i_itemp == NULL ||
3943 ip->i_itemp->ili_format.ilf_fields == 0);
3944 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3945 } else if (locked) {
3946 /*
3947 * We are not interested in doing an iflush if we're
3948 * in the process of shutting down the filesystem forcibly.
3949 * So, just reclaim the inode.
3950 */
3951 xfs_ifunlock(ip);
3952 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3953 }
3954
3955 reclaim:
3956 xfs_ireclaim(ip);
3957 return 0;
3958}
3959
3960int
3961xfs_finish_reclaim_all(xfs_mount_t *mp, int noblock)
3962{
3963 int purged;
3964 xfs_inode_t *ip, *n;
3965 int done = 0;
3966
3967 while (!done) {
3968 purged = 0;
3969 XFS_MOUNT_ILOCK(mp);
3970 list_for_each_entry_safe(ip, n, &mp->m_del_inodes, i_reclaim) {
3971 if (noblock) {
3972 if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0)
3973 continue;
3974 if (xfs_ipincount(ip) ||
3975 !xfs_iflock_nowait(ip)) {
3976 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3977 continue;
3978 }
3979 }
3980 XFS_MOUNT_IUNLOCK(mp);
3981 xfs_finish_reclaim(ip, noblock,
3982 XFS_IFLUSH_DELWRI_ELSE_ASYNC);
3983 purged = 1;
3984 break;
3985 }
3986
3987 done = !purged;
3988 }
3989
3990 XFS_MOUNT_IUNLOCK(mp);
3991 return 0;
3992}
3993
3994/*
3995 * xfs_alloc_file_space()
3996 * This routine allocates disk space for the given file.
3997 *
3998 * If alloc_type == 0, this request is for an ALLOCSP type
3999 * request which will change the file size. In this case, no
4000 * DMAPI event will be generated by the call. A TRUNCATE event
4001 * will be generated later by xfs_setattr.
4002 *
4003 * If alloc_type != 0, this request is for a RESVSP type
4004 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
4005 * lower block boundary byte address is less than the file's
4006 * length.
4007 *
4008 * RETURNS:
4009 * 0 on success
4010 * errno on error
4011 *
4012 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10004013STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07004014xfs_alloc_file_space(
4015 xfs_inode_t *ip,
4016 xfs_off_t offset,
4017 xfs_off_t len,
4018 int alloc_type,
4019 int attr_flags)
4020{
4021 xfs_filblks_t allocated_fsb;
4022 xfs_filblks_t allocatesize_fsb;
4023 int committed;
4024 xfs_off_t count;
4025 xfs_filblks_t datablocks;
4026 int error;
4027 xfs_fsblock_t firstfsb;
4028 xfs_bmap_free_t free_list;
4029 xfs_bmbt_irec_t *imapp;
4030 xfs_bmbt_irec_t imaps[1];
4031 xfs_mount_t *mp;
4032 int numrtextents;
4033 int reccount;
4034 uint resblks;
4035 int rt;
4036 int rtextsize;
4037 xfs_fileoff_t startoffset_fsb;
4038 xfs_trans_t *tp;
4039 int xfs_bmapi_flags;
4040
4041 vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address);
4042 mp = ip->i_mount;
4043
4044 if (XFS_FORCED_SHUTDOWN(mp))
4045 return XFS_ERROR(EIO);
4046
4047 /*
4048 * determine if this is a realtime file
4049 */
4050 if ((rt = XFS_IS_REALTIME_INODE(ip)) != 0) {
4051 if (ip->i_d.di_extsize)
4052 rtextsize = ip->i_d.di_extsize;
4053 else
4054 rtextsize = mp->m_sb.sb_rextsize;
4055 } else
4056 rtextsize = 0;
4057
4058 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
4059 return error;
4060
4061 if (len <= 0)
4062 return XFS_ERROR(EINVAL);
4063
4064 count = len;
4065 error = 0;
4066 imapp = &imaps[0];
4067 reccount = 1;
4068 xfs_bmapi_flags = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0);
4069 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
4070 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
4071
4072 /* Generate a DMAPI event if needed. */
4073 if (alloc_type != 0 && offset < ip->i_d.di_size &&
4074 (attr_flags&ATTR_DMI) == 0 &&
4075 DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) {
4076 xfs_off_t end_dmi_offset;
4077
4078 end_dmi_offset = offset+len;
4079 if (end_dmi_offset > ip->i_d.di_size)
4080 end_dmi_offset = ip->i_d.di_size;
4081 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, XFS_ITOV(ip),
4082 offset, end_dmi_offset - offset,
4083 0, NULL);
4084 if (error)
4085 return(error);
4086 }
4087
4088 /*
4089 * allocate file space until done or until there is an error
4090 */
4091retry:
4092 while (allocatesize_fsb && !error) {
4093 /*
4094 * determine if reserving space on
4095 * the data or realtime partition.
4096 */
4097 if (rt) {
4098 xfs_fileoff_t s, e;
4099
4100 s = startoffset_fsb;
4101 do_div(s, rtextsize);
4102 s *= rtextsize;
4103 e = roundup_64(startoffset_fsb + allocatesize_fsb,
4104 rtextsize);
4105 numrtextents = (int)(e - s) / mp->m_sb.sb_rextsize;
4106 datablocks = 0;
4107 } else {
4108 datablocks = allocatesize_fsb;
4109 numrtextents = 0;
4110 }
4111
4112 /*
4113 * allocate and setup the transaction
4114 */
4115 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
4116 resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks);
4117 error = xfs_trans_reserve(tp,
4118 resblks,
4119 XFS_WRITE_LOG_RES(mp),
4120 numrtextents,
4121 XFS_TRANS_PERM_LOG_RES,
4122 XFS_WRITE_LOG_COUNT);
4123
4124 /*
4125 * check for running out of space
4126 */
4127 if (error) {
4128 /*
4129 * Free the transaction structure.
4130 */
4131 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
4132 xfs_trans_cancel(tp, 0);
4133 break;
4134 }
4135 xfs_ilock(ip, XFS_ILOCK_EXCL);
Nathan Scott06d10dd2005-06-21 15:48:47 +10004136 error = XFS_TRANS_RESERVE_QUOTA(mp, tp,
4137 ip->i_udquot, ip->i_gdquot, resblks, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004138 if (error)
4139 goto error1;
4140
4141 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
4142 xfs_trans_ihold(tp, ip);
4143
4144 /*
4145 * issue the bmapi() call to allocate the blocks
4146 */
4147 XFS_BMAP_INIT(&free_list, &firstfsb);
4148 error = xfs_bmapi(tp, ip, startoffset_fsb,
4149 allocatesize_fsb, xfs_bmapi_flags,
4150 &firstfsb, 0, imapp, &reccount,
4151 &free_list);
4152 if (error) {
4153 goto error0;
4154 }
4155
4156 /*
4157 * complete the transaction
4158 */
4159 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
4160 if (error) {
4161 goto error0;
4162 }
4163
4164 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
4165 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4166 if (error) {
4167 break;
4168 }
4169
4170 allocated_fsb = imapp->br_blockcount;
4171
4172 if (reccount == 0) {
4173 error = XFS_ERROR(ENOSPC);
4174 break;
4175 }
4176
4177 startoffset_fsb += allocated_fsb;
4178 allocatesize_fsb -= allocated_fsb;
4179 }
4180dmapi_enospc_check:
4181 if (error == ENOSPC && (attr_flags&ATTR_DMI) == 0 &&
4182 DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_NOSPACE)) {
4183
4184 error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE,
4185 XFS_ITOV(ip), DM_RIGHT_NULL,
4186 XFS_ITOV(ip), DM_RIGHT_NULL,
4187 NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */
4188 if (error == 0)
4189 goto retry; /* Maybe DMAPI app. has made space */
4190 /* else fall through with error from XFS_SEND_DATA */
4191 }
4192
4193 return error;
4194
4195 error0:
4196 xfs_bmap_cancel(&free_list);
4197 error1:
4198 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
4199 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4200 goto dmapi_enospc_check;
4201}
4202
4203/*
4204 * Zero file bytes between startoff and endoff inclusive.
4205 * The iolock is held exclusive and no blocks are buffered.
4206 */
4207STATIC int
4208xfs_zero_remaining_bytes(
4209 xfs_inode_t *ip,
4210 xfs_off_t startoff,
4211 xfs_off_t endoff)
4212{
4213 xfs_bmbt_irec_t imap;
4214 xfs_fileoff_t offset_fsb;
4215 xfs_off_t lastoffset;
4216 xfs_off_t offset;
4217 xfs_buf_t *bp;
4218 xfs_mount_t *mp = ip->i_mount;
4219 int nimap;
4220 int error = 0;
4221
4222 bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
4223 ip->i_d.di_flags & XFS_DIFLAG_REALTIME ?
4224 mp->m_rtdev_targp : mp->m_ddev_targp);
4225
4226 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
4227 offset_fsb = XFS_B_TO_FSBT(mp, offset);
4228 nimap = 1;
4229 error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0, NULL, 0, &imap,
4230 &nimap, NULL);
4231 if (error || nimap < 1)
4232 break;
4233 ASSERT(imap.br_blockcount >= 1);
4234 ASSERT(imap.br_startoff == offset_fsb);
4235 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
4236 if (lastoffset > endoff)
4237 lastoffset = endoff;
4238 if (imap.br_startblock == HOLESTARTBLOCK)
4239 continue;
4240 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
4241 if (imap.br_state == XFS_EXT_UNWRITTEN)
4242 continue;
4243 XFS_BUF_UNDONE(bp);
4244 XFS_BUF_UNWRITE(bp);
4245 XFS_BUF_READ(bp);
4246 XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock));
4247 xfsbdstrat(mp, bp);
4248 if ((error = xfs_iowait(bp))) {
4249 xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
4250 mp, bp, XFS_BUF_ADDR(bp));
4251 break;
4252 }
4253 memset(XFS_BUF_PTR(bp) +
4254 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
4255 0, lastoffset - offset + 1);
4256 XFS_BUF_UNDONE(bp);
4257 XFS_BUF_UNREAD(bp);
4258 XFS_BUF_WRITE(bp);
4259 xfsbdstrat(mp, bp);
4260 if ((error = xfs_iowait(bp))) {
4261 xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
4262 mp, bp, XFS_BUF_ADDR(bp));
4263 break;
4264 }
4265 }
4266 xfs_buf_free(bp);
4267 return error;
4268}
4269
4270/*
4271 * xfs_free_file_space()
4272 * This routine frees disk space for the given file.
4273 *
4274 * This routine is only called by xfs_change_file_space
4275 * for an UNRESVSP type call.
4276 *
4277 * RETURNS:
4278 * 0 on success
4279 * errno on error
4280 *
4281 */
4282STATIC int
4283xfs_free_file_space(
4284 xfs_inode_t *ip,
4285 xfs_off_t offset,
4286 xfs_off_t len,
4287 int attr_flags)
4288{
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004289 vnode_t *vp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004290 int committed;
4291 int done;
4292 xfs_off_t end_dmi_offset;
4293 xfs_fileoff_t endoffset_fsb;
4294 int error;
4295 xfs_fsblock_t firstfsb;
4296 xfs_bmap_free_t free_list;
4297 xfs_off_t ilen;
4298 xfs_bmbt_irec_t imap;
4299 xfs_off_t ioffset;
4300 xfs_extlen_t mod=0;
4301 xfs_mount_t *mp;
4302 int nimap;
4303 uint resblks;
4304 int rounding;
4305 int rt;
4306 xfs_fileoff_t startoffset_fsb;
4307 xfs_trans_t *tp;
Dean Roehrich5fcbab32005-05-05 13:27:19 -07004308 int need_iolock = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004309
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004310 vp = XFS_ITOV(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004311 mp = ip->i_mount;
4312
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004313 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
4314
Linus Torvalds1da177e2005-04-16 15:20:36 -07004315 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
4316 return error;
4317
4318 error = 0;
4319 if (len <= 0) /* if nothing being freed */
4320 return error;
4321 rt = (ip->i_d.di_flags & XFS_DIFLAG_REALTIME);
4322 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
4323 end_dmi_offset = offset + len;
4324 endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset);
4325
4326 if (offset < ip->i_d.di_size &&
4327 (attr_flags & ATTR_DMI) == 0 &&
4328 DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) {
4329 if (end_dmi_offset > ip->i_d.di_size)
4330 end_dmi_offset = ip->i_d.di_size;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004331 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, vp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004332 offset, end_dmi_offset - offset,
4333 AT_DELAY_FLAG(attr_flags), NULL);
4334 if (error)
4335 return(error);
4336 }
4337
Dean Roehrich5fcbab32005-05-05 13:27:19 -07004338 ASSERT(attr_flags & ATTR_NOLOCK ? attr_flags & ATTR_DMI : 1);
4339 if (attr_flags & ATTR_NOLOCK)
4340 need_iolock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004341 if (need_iolock)
4342 xfs_ilock(ip, XFS_IOLOCK_EXCL);
Dean Roehrich5fcbab32005-05-05 13:27:19 -07004343
Linus Torvalds1da177e2005-04-16 15:20:36 -07004344 rounding = MAX((__uint8_t)(1 << mp->m_sb.sb_blocklog),
4345 (__uint8_t)NBPP);
4346 ilen = len + (offset & (rounding - 1));
4347 ioffset = offset & ~(rounding - 1);
4348 if (ilen & (rounding - 1))
4349 ilen = (ilen + rounding) & ~(rounding - 1);
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004350
4351 if (VN_CACHED(vp) != 0) {
4352 xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1,
4353 ctooff(offtoct(ioffset)), -1);
4354 VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(ioffset)),
4355 -1, FI_REMAPF_LOCKED);
4356 }
4357
Linus Torvalds1da177e2005-04-16 15:20:36 -07004358 /*
4359 * Need to zero the stuff we're not freeing, on disk.
4360 * If its a realtime file & can't use unwritten extents then we
4361 * actually need to zero the extent edges. Otherwise xfs_bunmapi
4362 * will take care of it for us.
4363 */
4364 if (rt && !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
4365 nimap = 1;
4366 error = xfs_bmapi(NULL, ip, startoffset_fsb, 1, 0, NULL, 0,
4367 &imap, &nimap, NULL);
4368 if (error)
4369 goto out_unlock_iolock;
4370 ASSERT(nimap == 0 || nimap == 1);
4371 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
4372 xfs_daddr_t block;
4373
4374 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
4375 block = imap.br_startblock;
4376 mod = do_div(block, mp->m_sb.sb_rextsize);
4377 if (mod)
4378 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
4379 }
4380 nimap = 1;
4381 error = xfs_bmapi(NULL, ip, endoffset_fsb - 1, 1, 0, NULL, 0,
4382 &imap, &nimap, NULL);
4383 if (error)
4384 goto out_unlock_iolock;
4385 ASSERT(nimap == 0 || nimap == 1);
4386 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
4387 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
4388 mod++;
4389 if (mod && (mod != mp->m_sb.sb_rextsize))
4390 endoffset_fsb -= mod;
4391 }
4392 }
4393 if ((done = (endoffset_fsb <= startoffset_fsb)))
4394 /*
4395 * One contiguous piece to clear
4396 */
4397 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
4398 else {
4399 /*
4400 * Some full blocks, possibly two pieces to clear
4401 */
4402 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
4403 error = xfs_zero_remaining_bytes(ip, offset,
4404 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
4405 if (!error &&
4406 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
4407 error = xfs_zero_remaining_bytes(ip,
4408 XFS_FSB_TO_B(mp, endoffset_fsb),
4409 offset + len - 1);
4410 }
4411
4412 /*
4413 * free file space until done or until there is an error
4414 */
4415 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
4416 while (!error && !done) {
4417
4418 /*
4419 * allocate and setup the transaction
4420 */
4421 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
4422 error = xfs_trans_reserve(tp,
4423 resblks,
4424 XFS_WRITE_LOG_RES(mp),
4425 0,
4426 XFS_TRANS_PERM_LOG_RES,
4427 XFS_WRITE_LOG_COUNT);
4428
4429 /*
4430 * check for running out of space
4431 */
4432 if (error) {
4433 /*
4434 * Free the transaction structure.
4435 */
4436 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
4437 xfs_trans_cancel(tp, 0);
4438 break;
4439 }
4440 xfs_ilock(ip, XFS_ILOCK_EXCL);
4441 error = XFS_TRANS_RESERVE_QUOTA(mp, tp,
4442 ip->i_udquot, ip->i_gdquot, resblks, 0, rt ?
4443 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS);
4444 if (error)
4445 goto error1;
4446
4447 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
4448 xfs_trans_ihold(tp, ip);
4449
4450 /*
4451 * issue the bunmapi() call to free the blocks
4452 */
4453 XFS_BMAP_INIT(&free_list, &firstfsb);
4454 error = xfs_bunmapi(tp, ip, startoffset_fsb,
4455 endoffset_fsb - startoffset_fsb,
4456 0, 2, &firstfsb, &free_list, &done);
4457 if (error) {
4458 goto error0;
4459 }
4460
4461 /*
4462 * complete the transaction
4463 */
4464 error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed);
4465 if (error) {
4466 goto error0;
4467 }
4468
4469 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
4470 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4471 }
4472
4473 out_unlock_iolock:
4474 if (need_iolock)
4475 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
4476 return error;
4477
4478 error0:
4479 xfs_bmap_cancel(&free_list);
4480 error1:
4481 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
4482 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
4483 XFS_ILOCK_EXCL);
4484 return error;
4485}
4486
4487/*
4488 * xfs_change_file_space()
4489 * This routine allocates or frees disk space for the given file.
4490 * The user specified parameters are checked for alignment and size
4491 * limitations.
4492 *
4493 * RETURNS:
4494 * 0 on success
4495 * errno on error
4496 *
4497 */
4498int
4499xfs_change_file_space(
4500 bhv_desc_t *bdp,
4501 int cmd,
4502 xfs_flock64_t *bf,
4503 xfs_off_t offset,
4504 cred_t *credp,
4505 int attr_flags)
4506{
4507 int clrprealloc;
4508 int error;
4509 xfs_fsize_t fsize;
4510 xfs_inode_t *ip;
4511 xfs_mount_t *mp;
4512 int setprealloc;
4513 xfs_off_t startoffset;
4514 xfs_off_t llen;
4515 xfs_trans_t *tp;
4516 vattr_t va;
4517 vnode_t *vp;
4518
4519 vp = BHV_TO_VNODE(bdp);
4520 vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address);
4521
4522 ip = XFS_BHVTOI(bdp);
4523 mp = ip->i_mount;
4524
4525 /*
4526 * must be a regular file and have write permission
4527 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +10004528 if (!VN_ISREG(vp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004529 return XFS_ERROR(EINVAL);
4530
4531 xfs_ilock(ip, XFS_ILOCK_SHARED);
4532
4533 if ((error = xfs_iaccess(ip, S_IWUSR, credp))) {
4534 xfs_iunlock(ip, XFS_ILOCK_SHARED);
4535 return error;
4536 }
4537
4538 xfs_iunlock(ip, XFS_ILOCK_SHARED);
4539
4540 switch (bf->l_whence) {
4541 case 0: /*SEEK_SET*/
4542 break;
4543 case 1: /*SEEK_CUR*/
4544 bf->l_start += offset;
4545 break;
4546 case 2: /*SEEK_END*/
4547 bf->l_start += ip->i_d.di_size;
4548 break;
4549 default:
4550 return XFS_ERROR(EINVAL);
4551 }
4552
4553 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
4554
4555 if ( (bf->l_start < 0)
4556 || (bf->l_start > XFS_MAXIOFFSET(mp))
4557 || (bf->l_start + llen < 0)
4558 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
4559 return XFS_ERROR(EINVAL);
4560
4561 bf->l_whence = 0;
4562
4563 startoffset = bf->l_start;
4564 fsize = ip->i_d.di_size;
4565
4566 /*
4567 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
4568 * file space.
4569 * These calls do NOT zero the data space allocated to the file,
4570 * nor do they change the file size.
4571 *
4572 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
4573 * space.
4574 * These calls cause the new file data to be zeroed and the file
4575 * size to be changed.
4576 */
4577 setprealloc = clrprealloc = 0;
4578
4579 switch (cmd) {
4580 case XFS_IOC_RESVSP:
4581 case XFS_IOC_RESVSP64:
4582 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
4583 1, attr_flags);
4584 if (error)
4585 return error;
4586 setprealloc = 1;
4587 break;
4588
4589 case XFS_IOC_UNRESVSP:
4590 case XFS_IOC_UNRESVSP64:
4591 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
4592 attr_flags)))
4593 return error;
4594 break;
4595
4596 case XFS_IOC_ALLOCSP:
4597 case XFS_IOC_ALLOCSP64:
4598 case XFS_IOC_FREESP:
4599 case XFS_IOC_FREESP64:
4600 if (startoffset > fsize) {
4601 error = xfs_alloc_file_space(ip, fsize,
4602 startoffset - fsize, 0, attr_flags);
4603 if (error)
4604 break;
4605 }
4606
4607 va.va_mask = XFS_AT_SIZE;
4608 va.va_size = startoffset;
4609
4610 error = xfs_setattr(bdp, &va, attr_flags, credp);
4611
4612 if (error)
4613 return error;
4614
4615 clrprealloc = 1;
4616 break;
4617
4618 default:
4619 ASSERT(0);
4620 return XFS_ERROR(EINVAL);
4621 }
4622
4623 /*
4624 * update the inode timestamp, mode, and prealloc flag bits
4625 */
4626 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
4627
4628 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
4629 0, 0, 0))) {
4630 /* ASSERT(0); */
4631 xfs_trans_cancel(tp, 0);
4632 return error;
4633 }
4634
4635 xfs_ilock(ip, XFS_ILOCK_EXCL);
4636
4637 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
4638 xfs_trans_ihold(tp, ip);
4639
4640 if ((attr_flags & ATTR_DMI) == 0) {
4641 ip->i_d.di_mode &= ~S_ISUID;
4642
4643 /*
4644 * Note that we don't have to worry about mandatory
4645 * file locking being disabled here because we only
4646 * clear the S_ISGID bit if the Group execute bit is
4647 * on, but if it was on then mandatory locking wouldn't
4648 * have been enabled.
4649 */
4650 if (ip->i_d.di_mode & S_IXGRP)
4651 ip->i_d.di_mode &= ~S_ISGID;
4652
4653 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
4654 }
4655 if (setprealloc)
4656 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
4657 else if (clrprealloc)
4658 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
4659
4660 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
4661 xfs_trans_set_sync(tp);
4662
4663 error = xfs_trans_commit(tp, 0, NULL);
4664
4665 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4666
4667 return error;
4668}
4669
4670vnodeops_t xfs_vnodeops = {
4671 BHV_IDENTITY_INIT(VN_BHV_XFS,VNODE_POSITION_XFS),
4672 .vop_open = xfs_open,
4673 .vop_read = xfs_read,
4674#ifdef HAVE_SENDFILE
4675 .vop_sendfile = xfs_sendfile,
4676#endif
4677 .vop_write = xfs_write,
4678 .vop_ioctl = xfs_ioctl,
4679 .vop_getattr = xfs_getattr,
4680 .vop_setattr = xfs_setattr,
4681 .vop_access = xfs_access,
4682 .vop_lookup = xfs_lookup,
4683 .vop_create = xfs_create,
4684 .vop_remove = xfs_remove,
4685 .vop_link = xfs_link,
4686 .vop_rename = xfs_rename,
4687 .vop_mkdir = xfs_mkdir,
4688 .vop_rmdir = xfs_rmdir,
4689 .vop_readdir = xfs_readdir,
4690 .vop_symlink = xfs_symlink,
4691 .vop_readlink = xfs_readlink,
4692 .vop_fsync = xfs_fsync,
4693 .vop_inactive = xfs_inactive,
4694 .vop_fid2 = xfs_fid2,
4695 .vop_rwlock = xfs_rwlock,
4696 .vop_rwunlock = xfs_rwunlock,
4697 .vop_bmap = xfs_bmap,
4698 .vop_reclaim = xfs_reclaim,
4699 .vop_attr_get = xfs_attr_get,
4700 .vop_attr_set = xfs_attr_set,
4701 .vop_attr_remove = xfs_attr_remove,
4702 .vop_attr_list = xfs_attr_list,
4703 .vop_link_removed = (vop_link_removed_t)fs_noval,
4704 .vop_vnode_change = (vop_vnode_change_t)fs_noval,
4705 .vop_tosspages = fs_tosspages,
4706 .vop_flushinval_pages = fs_flushinval_pages,
4707 .vop_flush_pages = fs_flush_pages,
4708 .vop_release = xfs_release,
4709 .vop_iflush = xfs_inode_flush,
4710};