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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Olaf Weber3e57ecf2006-06-09 14:48:12 +10002 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
Nathan Scott7b718762005-11-02 14:58:39 +11003 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110020#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110022#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110024#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "xfs_trans.h"
26#include "xfs_sb.h"
27#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "xfs_dir2.h"
29#include "xfs_dmapi.h"
30#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_ialloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_dir2_sf.h"
36#include "xfs_attr_sf.h"
37#include "xfs_dinode.h"
38#include "xfs_inode.h"
39#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include "xfs_itable.h"
41#include "xfs_btree.h"
42#include "xfs_ialloc.h"
43#include "xfs_alloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include "xfs_bmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include "xfs_attr.h"
46#include "xfs_rw.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "xfs_error.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include "xfs_quota.h"
49#include "xfs_utils.h"
Nathan Scotta844f452005-11-02 14:38:42 +110050#include "xfs_rtalloc.h"
51#include "xfs_refcache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include "xfs_trans_space.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include "xfs_log_priv.h"
David Chinner2a82b8b2007-07-11 11:09:12 +100054#include "xfs_filestream.h"
Christoph Hellwig993386c2007-08-28 16:12:30 +100055#include "xfs_vnodeops.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Christoph Hellwig993386c2007-08-28 16:12:30 +100057int
Linus Torvalds1da177e2005-04-16 15:20:36 -070058xfs_open(
Christoph Hellwig993386c2007-08-28 16:12:30 +100059 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
61 int mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
64 return XFS_ERROR(EIO);
65
66 /*
67 * If it's a directory with any blocks, read-ahead block 0
68 * as we're almost certain to have the next operation be a read there.
69 */
Christoph Hellwig993386c2007-08-28 16:12:30 +100070 if (S_ISDIR(ip->i_d.di_mode) && ip->i_d.di_nextents > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 mode = xfs_ilock_map_shared(ip);
72 if (ip->i_d.di_nextents > 0)
73 (void)xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK);
74 xfs_iunlock(ip, mode);
75 }
76 return 0;
77}
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079/*
80 * xfs_getattr
81 */
Christoph Hellwig993386c2007-08-28 16:12:30 +100082int
Linus Torvalds1da177e2005-04-16 15:20:36 -070083xfs_getattr(
Christoph Hellwig993386c2007-08-28 16:12:30 +100084 xfs_inode_t *ip,
Nathan Scott8285fb52006-06-09 17:07:12 +100085 bhv_vattr_t *vap,
Christoph Hellwig993386c2007-08-28 16:12:30 +100086 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Christoph Hellwig993386c2007-08-28 16:12:30 +100088 bhv_vnode_t *vp = XFS_ITOV(ip);
89 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Christoph Hellwig1543d792007-08-29 11:46:47 +100091 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (XFS_FORCED_SHUTDOWN(mp))
94 return XFS_ERROR(EIO);
95
96 if (!(flags & ATTR_LAZY))
97 xfs_ilock(ip, XFS_ILOCK_SHARED);
98
Lachlan McIlroyba87ea62007-05-08 13:49:46 +100099 vap->va_size = XFS_ISIZE(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (vap->va_mask == XFS_AT_SIZE)
101 goto all_done;
102
103 vap->va_nblocks =
104 XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
105 vap->va_nodeid = ip->i_ino;
106#if XFS_BIG_INUMS
107 vap->va_nodeid += mp->m_inoadd;
108#endif
109 vap->va_nlink = ip->i_d.di_nlink;
110
111 /*
112 * Quick exit for non-stat callers
113 */
114 if ((vap->va_mask &
115 ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID|
116 XFS_AT_NLINK|XFS_AT_BLKSIZE)) == 0)
117 goto all_done;
118
119 /*
120 * Copy from in-core inode.
121 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000122 vap->va_mode = ip->i_d.di_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 vap->va_uid = ip->i_d.di_uid;
124 vap->va_gid = ip->i_d.di_gid;
125 vap->va_projid = ip->i_d.di_projid;
126
127 /*
128 * Check vnode type block/char vs. everything else.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000130 switch (ip->i_d.di_mode & S_IFMT) {
131 case S_IFBLK:
132 case S_IFCHR:
133 vap->va_rdev = ip->i_df.if_u2.if_rdev;
134 vap->va_blocksize = BLKDEV_IOSIZE;
135 break;
136 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 vap->va_rdev = 0;
138
139 if (!(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
David Chinnere8c8b3a2005-11-02 10:33:05 +1100140 vap->va_blocksize = xfs_preferred_iosize(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 } else {
142
143 /*
144 * If the file blocks are being allocated from a
145 * realtime partition, then return the inode's
146 * realtime extent size or the realtime volume's
147 * extent size.
148 */
David Chinner957d0eb2007-06-18 16:50:37 +1000149 vap->va_blocksize =
150 xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000152 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
154
Nathan Scottca5ccbf2006-01-11 21:03:04 +1100155 vn_atime_to_timespec(vp, &vap->va_atime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 vap->va_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
157 vap->va_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
158 vap->va_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
159 vap->va_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
160
161 /*
162 * Exit for stat callers. See if any of the rest of the fields
163 * to be filled in are needed.
164 */
165 if ((vap->va_mask &
166 (XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS|
167 XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0)
168 goto all_done;
169
170 /*
171 * Convert di_flags to xflags.
172 */
173 vap->va_xflags = xfs_ip2xflags(ip);
174
175 /*
176 * Exit for inode revalidate. See if any of the rest of
177 * the fields to be filled in are needed.
178 */
179 if ((vap->va_mask &
180 (XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS|
181 XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0)
182 goto all_done;
183
184 vap->va_extsize = ip->i_d.di_extsize << mp->m_sb.sb_blocklog;
185 vap->va_nextents =
186 (ip->i_df.if_flags & XFS_IFEXTENTS) ?
187 ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) :
188 ip->i_d.di_nextents;
189 if (ip->i_afp)
190 vap->va_anextents =
191 (ip->i_afp->if_flags & XFS_IFEXTENTS) ?
192 ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) :
193 ip->i_d.di_anextents;
194 else
195 vap->va_anextents = 0;
196 vap->va_gen = ip->i_d.di_gen;
197
198 all_done:
199 if (!(flags & ATTR_LAZY))
200 xfs_iunlock(ip, XFS_ILOCK_SHARED);
201 return 0;
202}
203
204
205/*
206 * xfs_setattr
207 */
208int
209xfs_setattr(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000210 xfs_inode_t *ip,
Nathan Scott8285fb52006-06-09 17:07:12 +1000211 bhv_vattr_t *vap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 int flags,
213 cred_t *credp)
214{
Christoph Hellwig993386c2007-08-28 16:12:30 +1000215 bhv_vnode_t *vp = XFS_ITOV(ip);
216 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 int mask;
219 int code;
220 uint lock_flags;
221 uint commit_flags=0;
222 uid_t uid=0, iuid=0;
223 gid_t gid=0, igid=0;
224 int timeflags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 xfs_prid_t projid=0, iprojid=0;
226 int mandlock_before, mandlock_after;
227 struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2;
228 int file_owner;
Dean Roehrich5fcbab32005-05-05 13:27:19 -0700229 int need_iolock = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Christoph Hellwig1543d792007-08-29 11:46:47 +1000231 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Christoph Hellwigbd186aa2007-08-30 17:21:12 +1000233 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return XFS_ERROR(EROFS);
235
236 /*
237 * Cannot set certain attributes.
238 */
239 mask = vap->va_mask;
240 if (mask & XFS_AT_NOSET) {
241 return XFS_ERROR(EINVAL);
242 }
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (XFS_FORCED_SHUTDOWN(mp))
245 return XFS_ERROR(EIO);
246
247 /*
248 * Timestamps do not need to be logged and hence do not
249 * need to be done within a transaction.
250 */
251 if (mask & XFS_AT_UPDTIMES) {
252 ASSERT((mask & ~XFS_AT_UPDTIMES) == 0);
253 timeflags = ((mask & XFS_AT_UPDATIME) ? XFS_ICHGTIME_ACC : 0) |
254 ((mask & XFS_AT_UPDCTIME) ? XFS_ICHGTIME_CHG : 0) |
255 ((mask & XFS_AT_UPDMTIME) ? XFS_ICHGTIME_MOD : 0);
256 xfs_ichgtime(ip, timeflags);
257 return 0;
258 }
259
260 olddquot1 = olddquot2 = NULL;
261 udqp = gdqp = NULL;
262
263 /*
264 * If disk quotas is on, we make sure that the dquots do exist on disk,
265 * before we start any other transactions. Trying to do this later
266 * is messy. We don't care to take a readlock to look at the ids
267 * in inode here, because we can't hold it across the trans_reserve.
268 * If the IDs do change before we take the ilock, we're covered
269 * because the i_*dquot fields will get updated anyway.
270 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000271 if (XFS_IS_QUOTA_ON(mp) &&
272 (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 uint qflags = 0;
274
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000275 if ((mask & XFS_AT_UID) && XFS_IS_UQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 uid = vap->va_uid;
277 qflags |= XFS_QMOPT_UQUOTA;
278 } else {
279 uid = ip->i_d.di_uid;
280 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000281 if ((mask & XFS_AT_GID) && XFS_IS_GQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 gid = vap->va_gid;
283 qflags |= XFS_QMOPT_GQUOTA;
284 } else {
285 gid = ip->i_d.di_gid;
286 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000287 if ((mask & XFS_AT_PROJID) && XFS_IS_PQUOTA_ON(mp)) {
288 projid = vap->va_projid;
289 qflags |= XFS_QMOPT_PQUOTA;
290 } else {
291 projid = ip->i_d.di_projid;
292 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 /*
294 * We take a reference when we initialize udqp and gdqp,
295 * so it is important that we never blindly double trip on
296 * the same variable. See xfs_create() for an example.
297 */
298 ASSERT(udqp == NULL);
299 ASSERT(gdqp == NULL);
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000300 code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, projid, qflags,
301 &udqp, &gdqp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 if (code)
Jesper Juhl014c2542006-01-15 02:37:08 +0100303 return code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 }
305
306 /*
307 * For the other attributes, we acquire the inode lock and
308 * first do an error checking pass.
309 */
310 tp = NULL;
311 lock_flags = XFS_ILOCK_EXCL;
Dean Roehrich5fcbab32005-05-05 13:27:19 -0700312 if (flags & ATTR_NOLOCK)
313 need_iolock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if (!(mask & XFS_AT_SIZE)) {
315 if ((mask != (XFS_AT_CTIME|XFS_AT_ATIME|XFS_AT_MTIME)) ||
316 (mp->m_flags & XFS_MOUNT_WSYNC)) {
317 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
318 commit_flags = 0;
319 if ((code = xfs_trans_reserve(tp, 0,
320 XFS_ICHANGE_LOG_RES(mp), 0,
321 0, 0))) {
322 lock_flags = 0;
323 goto error_return;
324 }
325 }
326 } else {
Christoph Hellwigeb9df392007-08-16 18:42:07 +1000327 if (DM_EVENT_ENABLED(ip, DM_EVENT_TRUNCATE) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 !(flags & ATTR_DMI)) {
329 int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR;
330 code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, vp,
331 vap->va_size, 0, dmflags, NULL);
332 if (code) {
333 lock_flags = 0;
334 goto error_return;
335 }
336 }
337 if (need_iolock)
338 lock_flags |= XFS_IOLOCK_EXCL;
339 }
340
341 xfs_ilock(ip, lock_flags);
342
343 /* boolean: are we the file owner? */
344 file_owner = (current_fsuid(credp) == ip->i_d.di_uid);
345
346 /*
347 * Change various properties of a file.
348 * Only the owner or users with CAP_FOWNER
349 * capability may do these things.
350 */
351 if (mask &
352 (XFS_AT_MODE|XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_UID|
353 XFS_AT_GID|XFS_AT_PROJID)) {
354 /*
355 * CAP_FOWNER overrides the following restrictions:
356 *
357 * The user ID of the calling process must be equal
358 * to the file owner ID, except in cases where the
359 * CAP_FSETID capability is applicable.
360 */
361 if (!file_owner && !capable(CAP_FOWNER)) {
362 code = XFS_ERROR(EPERM);
363 goto error_return;
364 }
365
366 /*
367 * CAP_FSETID overrides the following restrictions:
368 *
369 * The effective user ID of the calling process shall match
370 * the file owner when setting the set-user-ID and
371 * set-group-ID bits on that file.
372 *
373 * The effective group ID or one of the supplementary group
374 * IDs of the calling process shall match the group owner of
375 * the file when setting the set-group-ID bit on that file
376 */
377 if (mask & XFS_AT_MODE) {
378 mode_t m = 0;
379
380 if ((vap->va_mode & S_ISUID) && !file_owner)
381 m |= S_ISUID;
382 if ((vap->va_mode & S_ISGID) &&
383 !in_group_p((gid_t)ip->i_d.di_gid))
384 m |= S_ISGID;
385#if 0
386 /* Linux allows this, Irix doesn't. */
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000387 if ((vap->va_mode & S_ISVTX) && !VN_ISDIR(vp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 m |= S_ISVTX;
389#endif
390 if (m && !capable(CAP_FSETID))
391 vap->va_mode &= ~m;
392 }
393 }
394
395 /*
396 * Change file ownership. Must be the owner or privileged.
397 * If the system was configured with the "restricted_chown"
398 * option, the owner is not permitted to give away the file,
399 * and can change the group id only to a group of which he
400 * or she is a member.
401 */
402 if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) {
403 /*
404 * These IDs could have changed since we last looked at them.
405 * But, we're assured that if the ownership did change
406 * while we didn't have the inode locked, inode's dquot(s)
407 * would have changed also.
408 */
409 iuid = ip->i_d.di_uid;
410 iprojid = ip->i_d.di_projid;
411 igid = ip->i_d.di_gid;
412 gid = (mask & XFS_AT_GID) ? vap->va_gid : igid;
413 uid = (mask & XFS_AT_UID) ? vap->va_uid : iuid;
414 projid = (mask & XFS_AT_PROJID) ? (xfs_prid_t)vap->va_projid :
415 iprojid;
416
417 /*
418 * CAP_CHOWN overrides the following restrictions:
419 *
420 * If _POSIX_CHOWN_RESTRICTED is defined, this capability
421 * shall override the restriction that a process cannot
422 * change the user ID of a file it owns and the restriction
423 * that the group ID supplied to the chown() function
424 * shall be equal to either the group ID or one of the
425 * supplementary group IDs of the calling process.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 */
427 if (restricted_chown &&
428 (iuid != uid || (igid != gid &&
429 !in_group_p((gid_t)gid))) &&
430 !capable(CAP_CHOWN)) {
431 code = XFS_ERROR(EPERM);
432 goto error_return;
433 }
434 /*
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000435 * Do a quota reservation only if uid/projid/gid is actually
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 * going to change.
437 */
438 if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000439 (XFS_IS_PQUOTA_ON(mp) && iprojid != projid) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 (XFS_IS_GQUOTA_ON(mp) && igid != gid)) {
441 ASSERT(tp);
442 code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp,
443 capable(CAP_FOWNER) ?
444 XFS_QMOPT_FORCE_RES : 0);
445 if (code) /* out of quota */
446 goto error_return;
447 }
448 }
449
450 /*
451 * Truncate file. Must have write permission and not be a directory.
452 */
453 if (mask & XFS_AT_SIZE) {
454 /* Short circuit the truncate case for zero length files */
455 if ((vap->va_size == 0) &&
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000456 (ip->i_size == 0) && (ip->i_d.di_nextents == 0)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 xfs_iunlock(ip, XFS_ILOCK_EXCL);
458 lock_flags &= ~XFS_ILOCK_EXCL;
459 if (mask & XFS_AT_CTIME)
460 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
461 code = 0;
462 goto error_return;
463 }
464
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000465 if (VN_ISDIR(vp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 code = XFS_ERROR(EISDIR);
467 goto error_return;
Christoph Hellwig0432dab2005-09-02 16:46:51 +1000468 } else if (!VN_ISREG(vp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 code = XFS_ERROR(EINVAL);
470 goto error_return;
471 }
472 /*
473 * Make sure that the dquots are attached to the inode.
474 */
475 if ((code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED)))
476 goto error_return;
477 }
478
479 /*
480 * Change file access or modified times.
481 */
482 if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) {
483 if (!file_owner) {
484 if ((flags & ATTR_UTIME) &&
485 !capable(CAP_FOWNER)) {
486 code = XFS_ERROR(EPERM);
487 goto error_return;
488 }
489 }
490 }
491
492 /*
493 * Change extent size or realtime flag.
494 */
495 if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) {
496 /*
497 * Can't change extent size if any extents are allocated.
498 */
Eric Sandeene94af022005-11-02 15:10:41 +1100499 if (ip->i_d.di_nextents && (mask & XFS_AT_EXTSIZE) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) !=
501 vap->va_extsize) ) {
502 code = XFS_ERROR(EINVAL); /* EFBIG? */
503 goto error_return;
504 }
505
506 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 * Can't change realtime flag if any extents are allocated.
508 */
Eric Sandeene94af022005-11-02 15:10:41 +1100509 if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
510 (mask & XFS_AT_XFLAGS) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
512 (vap->va_xflags & XFS_XFLAG_REALTIME)) {
513 code = XFS_ERROR(EINVAL); /* EFBIG? */
514 goto error_return;
515 }
516 /*
517 * Extent size must be a multiple of the appropriate block
518 * size, if set at all.
519 */
520 if ((mask & XFS_AT_EXTSIZE) && vap->va_extsize != 0) {
521 xfs_extlen_t size;
522
523 if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ||
524 ((mask & XFS_AT_XFLAGS) &&
525 (vap->va_xflags & XFS_XFLAG_REALTIME))) {
526 size = mp->m_sb.sb_rextsize <<
527 mp->m_sb.sb_blocklog;
528 } else {
529 size = mp->m_sb.sb_blocksize;
530 }
531 if (vap->va_extsize % size) {
532 code = XFS_ERROR(EINVAL);
533 goto error_return;
534 }
535 }
536 /*
537 * If realtime flag is set then must have realtime data.
538 */
539 if ((mask & XFS_AT_XFLAGS) &&
540 (vap->va_xflags & XFS_XFLAG_REALTIME)) {
541 if ((mp->m_sb.sb_rblocks == 0) ||
542 (mp->m_sb.sb_rextsize == 0) ||
543 (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) {
544 code = XFS_ERROR(EINVAL);
545 goto error_return;
546 }
547 }
548
549 /*
550 * Can't modify an immutable/append-only file unless
551 * we have appropriate permission.
552 */
553 if ((mask & XFS_AT_XFLAGS) &&
554 (ip->i_d.di_flags &
555 (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) ||
556 (vap->va_xflags &
557 (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) &&
558 !capable(CAP_LINUX_IMMUTABLE)) {
559 code = XFS_ERROR(EPERM);
560 goto error_return;
561 }
562 }
563
564 /*
565 * Now we can make the changes. Before we join the inode
566 * to the transaction, if XFS_AT_SIZE is set then take care of
567 * the part of the truncation that must be done without the
568 * inode lock. This needs to be done before joining the inode
569 * to the transaction, because the inode cannot be unlocked
570 * once it is a part of the transaction.
571 */
572 if (mask & XFS_AT_SIZE) {
573 code = 0;
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000574 if ((vap->va_size > ip->i_size) &&
Eric Sandeen374e2ac2005-11-02 15:07:34 +1100575 (flags & ATTR_NOSIZETOK) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 code = xfs_igrow_start(ip, vap->va_size, credp);
Eric Sandeen374e2ac2005-11-02 15:07:34 +1100577 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 xfs_iunlock(ip, XFS_ILOCK_EXCL);
David Chinnerc32676e2007-07-19 16:28:58 +1000579
580 /*
581 * We are going to log the inode size change in this
582 * transaction so any previous writes that are beyond the on
583 * disk EOF and the new EOF that have not been written out need
584 * to be written here. If we do not write the data out, we
585 * expose ourselves to the null files problem.
586 *
587 * Only flush from the on disk size to the smaller of the in
588 * memory file size or the new size as that's the range we
589 * really care about here and prevents waiting for other data
590 * not within the range we care about here.
591 */
592 if (!code &&
593 (ip->i_size != ip->i_d.di_size) &&
594 (vap->va_size > ip->i_d.di_size)) {
Christoph Hellwig739bfb22007-08-29 10:58:01 +1000595 code = xfs_flush_pages(ip,
David Chinnerc32676e2007-07-19 16:28:58 +1000596 ip->i_d.di_size, vap->va_size,
597 XFS_B_ASYNC, FI_NONE);
598 }
599
600 /* wait for all I/O to complete */
Christoph Hellwigb677c212007-08-29 11:46:28 +1000601 vn_iowait(ip);
David Chinnerc32676e2007-07-19 16:28:58 +1000602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (!code)
604 code = xfs_itruncate_data(ip, vap->va_size);
605 if (code) {
606 ASSERT(tp == NULL);
607 lock_flags &= ~XFS_ILOCK_EXCL;
608 ASSERT(lock_flags == XFS_IOLOCK_EXCL);
609 goto error_return;
610 }
611 tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
612 if ((code = xfs_trans_reserve(tp, 0,
613 XFS_ITRUNCATE_LOG_RES(mp), 0,
614 XFS_TRANS_PERM_LOG_RES,
615 XFS_ITRUNCATE_LOG_COUNT))) {
616 xfs_trans_cancel(tp, 0);
617 if (need_iolock)
618 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
619 return code;
620 }
621 commit_flags = XFS_TRANS_RELEASE_LOG_RES;
622 xfs_ilock(ip, XFS_ILOCK_EXCL);
623 }
624
625 if (tp) {
626 xfs_trans_ijoin(tp, ip, lock_flags);
627 xfs_trans_ihold(tp, ip);
628 }
629
630 /* determine whether mandatory locking mode changes */
631 mandlock_before = MANDLOCK(vp, ip->i_d.di_mode);
632
633 /*
634 * Truncate file. Must have write permission and not be a directory.
635 */
636 if (mask & XFS_AT_SIZE) {
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000637 if (vap->va_size > ip->i_size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 xfs_igrow_finish(tp, ip, vap->va_size,
639 !(flags & ATTR_DMI));
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000640 } else if ((vap->va_size <= ip->i_size) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 ((vap->va_size == 0) && ip->i_d.di_nextents)) {
642 /*
643 * signal a sync transaction unless
644 * we're truncating an already unlinked
645 * file on a wsync filesystem
646 */
647 code = xfs_itruncate_finish(&tp, ip,
648 (xfs_fsize_t)vap->va_size,
649 XFS_DATA_FORK,
650 ((ip->i_d.di_nlink != 0 ||
651 !(mp->m_flags & XFS_MOUNT_WSYNC))
652 ? 1 : 0));
Nathan Scott7d4fb402006-06-09 15:27:16 +1000653 if (code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 goto abort_return;
Nathan Scott7d4fb402006-06-09 15:27:16 +1000655 /*
656 * Truncated "down", so we're removing references
657 * to old data here - if we now delay flushing for
658 * a long time, we expose ourselves unduly to the
659 * notorious NULL files problem. So, we mark this
660 * vnode and flush it when the file is closed, and
661 * do not wait the usual (long) time for writeout.
662 */
Christoph Hellwigb3aea4e2007-08-29 11:44:37 +1000663 xfs_iflags_set(ip, XFS_ITRUNCATED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 }
665 /*
666 * Have to do this even if the file's size doesn't change.
667 */
668 timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG;
669 }
670
671 /*
672 * Change file access modes.
673 */
674 if (mask & XFS_AT_MODE) {
675 ip->i_d.di_mode &= S_IFMT;
676 ip->i_d.di_mode |= vap->va_mode & ~S_IFMT;
677
678 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
679 timeflags |= XFS_ICHGTIME_CHG;
680 }
681
682 /*
683 * Change file ownership. Must be the owner or privileged.
684 * If the system was configured with the "restricted_chown"
685 * option, the owner is not permitted to give away the file,
686 * and can change the group id only to a group of which he
687 * or she is a member.
688 */
689 if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) {
690 /*
691 * CAP_FSETID overrides the following restrictions:
692 *
693 * The set-user-ID and set-group-ID bits of a file will be
694 * cleared upon successful return from chown()
695 */
696 if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
697 !capable(CAP_FSETID)) {
698 ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
699 }
700
701 /*
702 * Change the ownerships and register quota modifications
703 * in the transaction.
704 */
705 if (iuid != uid) {
706 if (XFS_IS_UQUOTA_ON(mp)) {
707 ASSERT(mask & XFS_AT_UID);
708 ASSERT(udqp);
709 olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
710 &ip->i_udquot, udqp);
711 }
712 ip->i_d.di_uid = uid;
713 }
714 if (igid != gid) {
715 if (XFS_IS_GQUOTA_ON(mp)) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000716 ASSERT(!XFS_IS_PQUOTA_ON(mp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 ASSERT(mask & XFS_AT_GID);
718 ASSERT(gdqp);
719 olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
720 &ip->i_gdquot, gdqp);
721 }
722 ip->i_d.di_gid = gid;
723 }
724 if (iprojid != projid) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000725 if (XFS_IS_PQUOTA_ON(mp)) {
726 ASSERT(!XFS_IS_GQUOTA_ON(mp));
727 ASSERT(mask & XFS_AT_PROJID);
728 ASSERT(gdqp);
729 olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip,
730 &ip->i_gdquot, gdqp);
731 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 ip->i_d.di_projid = projid;
733 /*
734 * We may have to rev the inode as well as
735 * the superblock version number since projids didn't
736 * exist before DINODE_VERSION_2 and SB_VERSION_NLINK.
737 */
738 if (ip->i_d.di_version == XFS_DINODE_VERSION_1)
739 xfs_bump_ino_vers2(tp, ip);
740 }
741
742 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
743 timeflags |= XFS_ICHGTIME_CHG;
744 }
745
746
747 /*
748 * Change file access or modified times.
749 */
750 if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) {
751 if (mask & XFS_AT_ATIME) {
752 ip->i_d.di_atime.t_sec = vap->va_atime.tv_sec;
753 ip->i_d.di_atime.t_nsec = vap->va_atime.tv_nsec;
754 ip->i_update_core = 1;
755 timeflags &= ~XFS_ICHGTIME_ACC;
756 }
757 if (mask & XFS_AT_MTIME) {
758 ip->i_d.di_mtime.t_sec = vap->va_mtime.tv_sec;
759 ip->i_d.di_mtime.t_nsec = vap->va_mtime.tv_nsec;
760 timeflags &= ~XFS_ICHGTIME_MOD;
761 timeflags |= XFS_ICHGTIME_CHG;
762 }
763 if (tp && (flags & ATTR_UTIME))
764 xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE);
765 }
766
767 /*
768 * Change XFS-added attributes.
769 */
770 if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) {
771 if (mask & XFS_AT_EXTSIZE) {
772 /*
773 * Converting bytes to fs blocks.
774 */
775 ip->i_d.di_extsize = vap->va_extsize >>
776 mp->m_sb.sb_blocklog;
777 }
778 if (mask & XFS_AT_XFLAGS) {
779 uint di_flags;
780
781 /* can't set PREALLOC this way, just preserve it */
782 di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
783 if (vap->va_xflags & XFS_XFLAG_IMMUTABLE)
784 di_flags |= XFS_DIFLAG_IMMUTABLE;
785 if (vap->va_xflags & XFS_XFLAG_APPEND)
786 di_flags |= XFS_DIFLAG_APPEND;
787 if (vap->va_xflags & XFS_XFLAG_SYNC)
788 di_flags |= XFS_DIFLAG_SYNC;
789 if (vap->va_xflags & XFS_XFLAG_NOATIME)
790 di_flags |= XFS_DIFLAG_NOATIME;
791 if (vap->va_xflags & XFS_XFLAG_NODUMP)
792 di_flags |= XFS_DIFLAG_NODUMP;
Nathan Scott365ca832005-06-21 15:39:12 +1000793 if (vap->va_xflags & XFS_XFLAG_PROJINHERIT)
794 di_flags |= XFS_DIFLAG_PROJINHERIT;
Barry Naujokd3446ea2006-06-09 14:54:19 +1000795 if (vap->va_xflags & XFS_XFLAG_NODEFRAG)
796 di_flags |= XFS_DIFLAG_NODEFRAG;
David Chinner2a82b8b2007-07-11 11:09:12 +1000797 if (vap->va_xflags & XFS_XFLAG_FILESTREAM)
798 di_flags |= XFS_DIFLAG_FILESTREAM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
800 if (vap->va_xflags & XFS_XFLAG_RTINHERIT)
801 di_flags |= XFS_DIFLAG_RTINHERIT;
802 if (vap->va_xflags & XFS_XFLAG_NOSYMLINKS)
803 di_flags |= XFS_DIFLAG_NOSYMLINKS;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100804 if (vap->va_xflags & XFS_XFLAG_EXTSZINHERIT)
805 di_flags |= XFS_DIFLAG_EXTSZINHERIT;
806 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (vap->va_xflags & XFS_XFLAG_REALTIME) {
808 di_flags |= XFS_DIFLAG_REALTIME;
809 ip->i_iocore.io_flags |= XFS_IOCORE_RT;
810 } else {
811 ip->i_iocore.io_flags &= ~XFS_IOCORE_RT;
812 }
Nathan Scottdd9f4382006-01-11 15:28:28 +1100813 if (vap->va_xflags & XFS_XFLAG_EXTSIZE)
814 di_flags |= XFS_DIFLAG_EXTSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816 ip->i_d.di_flags = di_flags;
817 }
818 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
819 timeflags |= XFS_ICHGTIME_CHG;
820 }
821
822 /*
823 * Change file inode change time only if XFS_AT_CTIME set
824 * AND we have been called by a DMI function.
825 */
826
827 if ( (flags & ATTR_DMI) && (mask & XFS_AT_CTIME) ) {
828 ip->i_d.di_ctime.t_sec = vap->va_ctime.tv_sec;
829 ip->i_d.di_ctime.t_nsec = vap->va_ctime.tv_nsec;
830 ip->i_update_core = 1;
831 timeflags &= ~XFS_ICHGTIME_CHG;
832 }
833
834 /*
835 * Send out timestamp changes that need to be set to the
836 * current time. Not done when called by a DMI function.
837 */
838 if (timeflags && !(flags & ATTR_DMI))
839 xfs_ichgtime(ip, timeflags);
840
841 XFS_STATS_INC(xs_ig_attrchg);
842
843 /*
844 * If this is a synchronous mount, make sure that the
845 * transaction goes to disk before returning to the user.
846 * This is slightly sub-optimal in that truncates require
Nathan Scottc41564b2006-03-29 08:55:14 +1000847 * two sync transactions instead of one for wsync filesystems.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 * One for the truncate and one for the timestamps since we
849 * don't want to change the timestamps unless we're sure the
850 * truncate worked. Truncates are less than 1% of the laddis
851 * mix so this probably isn't worth the trouble to optimize.
852 */
853 code = 0;
854 if (tp) {
855 if (mp->m_flags & XFS_MOUNT_WSYNC)
856 xfs_trans_set_sync(tp);
857
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000858 code = xfs_trans_commit(tp, commit_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 }
860
861 /*
862 * If the (regular) file's mandatory locking mode changed, then
863 * notify the vnode. We do this under the inode lock to prevent
864 * racing calls to vop_vnode_change.
865 */
866 mandlock_after = MANDLOCK(vp, ip->i_d.di_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
868 xfs_iunlock(ip, lock_flags);
869
870 /*
871 * Release any dquot(s) the inode had kept before chown.
872 */
873 XFS_QM_DQRELE(mp, olddquot1);
874 XFS_QM_DQRELE(mp, olddquot2);
875 XFS_QM_DQRELE(mp, udqp);
876 XFS_QM_DQRELE(mp, gdqp);
877
878 if (code) {
879 return code;
880 }
881
Christoph Hellwigeb9df392007-08-16 18:42:07 +1000882 if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 !(flags & ATTR_DMI)) {
884 (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, vp, DM_RIGHT_NULL,
885 NULL, DM_RIGHT_NULL, NULL, NULL,
886 0, 0, AT_DELAY_FLAG(flags));
887 }
888 return 0;
889
890 abort_return:
891 commit_flags |= XFS_TRANS_ABORT;
892 /* FALLTHROUGH */
893 error_return:
894 XFS_QM_DQRELE(mp, udqp);
895 XFS_QM_DQRELE(mp, gdqp);
896 if (tp) {
897 xfs_trans_cancel(tp, commit_flags);
898 }
899 if (lock_flags != 0) {
900 xfs_iunlock(ip, lock_flags);
901 }
902 return code;
903}
904
905
906/*
907 * xfs_access
908 * Null conversion from vnode mode bits to inode mode bits, as in efs.
909 */
Christoph Hellwig993386c2007-08-28 16:12:30 +1000910int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911xfs_access(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000912 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 int mode,
914 cred_t *credp)
915{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 int error;
917
Christoph Hellwig1543d792007-08-29 11:46:47 +1000918 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 xfs_ilock(ip, XFS_ILOCK_SHARED);
921 error = xfs_iaccess(ip, mode, credp);
922 xfs_iunlock(ip, XFS_ILOCK_SHARED);
923 return error;
924}
925
926
927/*
Nathan Scott7d4fb402006-06-09 15:27:16 +1000928 * The maximum pathlen is 1024 bytes. Since the minimum file system
929 * blocksize is 512 bytes, we can get a max of 2 extents back from
930 * bmapi.
931 */
932#define SYMLINK_MAPS 2
933
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000934STATIC int
935xfs_readlink_bmap(
936 xfs_inode_t *ip,
937 char *link)
938{
939 xfs_mount_t *mp = ip->i_mount;
940 int pathlen = ip->i_d.di_size;
941 int nmaps = SYMLINK_MAPS;
942 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
943 xfs_daddr_t d;
944 int byte_cnt;
945 int n;
946 xfs_buf_t *bp;
947 int error = 0;
948
949 error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0,
950 mval, &nmaps, NULL, NULL);
951 if (error)
952 goto out;
953
954 for (n = 0; n < nmaps; n++) {
955 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
956 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
957
958 bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
959 error = XFS_BUF_GETERROR(bp);
960 if (error) {
961 xfs_ioerror_alert("xfs_readlink",
962 ip->i_mount, bp, XFS_BUF_ADDR(bp));
963 xfs_buf_relse(bp);
964 goto out;
965 }
966 if (pathlen < byte_cnt)
967 byte_cnt = pathlen;
968 pathlen -= byte_cnt;
969
970 memcpy(link, XFS_BUF_PTR(bp), byte_cnt);
971 xfs_buf_relse(bp);
972 }
973
974 link[ip->i_d.di_size] = '\0';
975 error = 0;
976
977 out:
978 return error;
979}
980
Christoph Hellwig993386c2007-08-28 16:12:30 +1000981int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982xfs_readlink(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000983 xfs_inode_t *ip,
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000984 char *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985{
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000986 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 int pathlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Christoph Hellwig1543d792007-08-29 11:46:47 +1000990 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
992 if (XFS_FORCED_SHUTDOWN(mp))
993 return XFS_ERROR(EIO);
994
995 xfs_ilock(ip, XFS_ILOCK_SHARED);
996
997 ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
Christoph Hellwig804c83c2007-08-28 13:59:03 +1000998 ASSERT(ip->i_d.di_size <= MAXPATHLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
Christoph Hellwig804c83c2007-08-28 13:59:03 +10001000 pathlen = ip->i_d.di_size;
1001 if (!pathlen)
1002 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003
1004 if (ip->i_df.if_flags & XFS_IFINLINE) {
Christoph Hellwig804c83c2007-08-28 13:59:03 +10001005 memcpy(link, ip->i_df.if_u1.if_data, pathlen);
1006 link[pathlen] = '\0';
1007 } else {
1008 error = xfs_readlink_bmap(ip, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 }
1010
Christoph Hellwig804c83c2007-08-28 13:59:03 +10001011 out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 xfs_iunlock(ip, XFS_ILOCK_SHARED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 return error;
1014}
1015
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016/*
1017 * xfs_fsync
1018 *
1019 * This is called to sync the inode and its data out to disk.
1020 * We need to hold the I/O lock while flushing the data, and
1021 * the inode lock while flushing the inode. The inode lock CANNOT
1022 * be held while flushing the data, so acquire after we're done
1023 * with that.
1024 */
Christoph Hellwig993386c2007-08-28 16:12:30 +10001025int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026xfs_fsync(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001027 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 int flag,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 xfs_off_t start,
1030 xfs_off_t stop)
1031{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 xfs_trans_t *tp;
1033 int error;
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001034 int log_flushed = 0, changed = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
Christoph Hellwig1543d792007-08-29 11:46:47 +10001036 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
1038 ASSERT(start >= 0 && stop >= -1);
1039
1040 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
1041 return XFS_ERROR(EIO);
1042
Lachlan McIlroy776a75f2007-09-14 15:22:50 +10001043 if (flag & FSYNC_DATA)
1044 filemap_fdatawait(vn_to_inode(XFS_ITOV(ip))->i_mapping);
1045
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 /*
1047 * We always need to make sure that the required inode state
1048 * is safe on disk. The vnode might be clean but because
1049 * of committed transactions that haven't hit the disk yet.
1050 * Likewise, there could be unflushed non-transactional
1051 * changes to the inode core that have to go to disk.
1052 *
1053 * The following code depends on one assumption: that
1054 * any transaction that changes an inode logs the core
1055 * because it has to change some field in the inode core
1056 * (typically nextents or nblocks). That assumption
1057 * implies that any transactions against an inode will
1058 * catch any non-transactional updates. If inode-altering
1059 * transactions exist that violate this assumption, the
1060 * code breaks. Right now, it figures that if the involved
1061 * update_* field is clear and the inode is unpinned, the
1062 * inode is clean. Either it's been flushed or it's been
1063 * committed and the commit has hit the disk unpinning the inode.
1064 * (Note that xfs_inode_item_format() called at commit clears
1065 * the update_* fields.)
1066 */
1067 xfs_ilock(ip, XFS_ILOCK_SHARED);
1068
1069 /* If we are flushing data then we care about update_size
1070 * being set, otherwise we care about update_core
1071 */
1072 if ((flag & FSYNC_DATA) ?
1073 (ip->i_update_size == 0) :
1074 (ip->i_update_core == 0)) {
1075 /*
1076 * Timestamps/size haven't changed since last inode
1077 * flush or inode transaction commit. That means
1078 * either nothing got written or a transaction
1079 * committed which caught the updates. If the
1080 * latter happened and the transaction hasn't
1081 * hit the disk yet, the inode will be still
1082 * be pinned. If it is, force the log.
1083 */
1084
1085 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1086
1087 if (xfs_ipincount(ip)) {
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001088 _xfs_log_force(ip->i_mount, (xfs_lsn_t)0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 XFS_LOG_FORCE |
1090 ((flag & FSYNC_WAIT)
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001091 ? XFS_LOG_SYNC : 0),
1092 &log_flushed);
1093 } else {
1094 /*
1095 * If the inode is not pinned and nothing
1096 * has changed we don't need to flush the
1097 * cache.
1098 */
1099 changed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 }
1101 error = 0;
1102 } else {
1103 /*
1104 * Kick off a transaction to log the inode
1105 * core to get the updates. Make it
1106 * sync if FSYNC_WAIT is passed in (which
1107 * is done by everybody but specfs). The
1108 * sync transaction will also force the log.
1109 */
1110 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1111 tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
1112 if ((error = xfs_trans_reserve(tp, 0,
1113 XFS_FSYNC_TS_LOG_RES(ip->i_mount),
1114 0, 0, 0))) {
1115 xfs_trans_cancel(tp, 0);
1116 return error;
1117 }
1118 xfs_ilock(ip, XFS_ILOCK_EXCL);
1119
1120 /*
1121 * Note - it's possible that we might have pushed
1122 * ourselves out of the way during trans_reserve
1123 * which would flush the inode. But there's no
1124 * guarantee that the inode buffer has actually
1125 * gone out yet (it's delwri). Plus the buffer
1126 * could be pinned anyway if it's part of an
1127 * inode in another recent transaction. So we
1128 * play it safe and fire off the transaction anyway.
1129 */
1130 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1131 xfs_trans_ihold(tp, ip);
1132 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1133 if (flag & FSYNC_WAIT)
1134 xfs_trans_set_sync(tp);
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001135 error = _xfs_trans_commit(tp, 0, &log_flushed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
1137 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1138 }
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001139
1140 if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) {
1141 /*
1142 * If the log write didn't issue an ordered tag we need
1143 * to flush the disk cache for the data device now.
1144 */
1145 if (!log_flushed)
1146 xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
1147
1148 /*
1149 * If this inode is on the RT dev we need to flush that
Nathan Scottc41564b2006-03-29 08:55:14 +10001150 * cache as well.
Christoph Hellwigf538d4d2005-11-02 10:26:59 +11001151 */
1152 if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)
1153 xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
1154 }
1155
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 return error;
1157}
1158
1159/*
David Chinner92dfe8d2007-05-24 15:22:19 +10001160 * This is called by xfs_inactive to free any blocks beyond eof
1161 * when the link count isn't zero and by xfs_dm_punch_hole() when
1162 * punching a hole to EOF.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 */
David Chinner92dfe8d2007-05-24 15:22:19 +10001164int
1165xfs_free_eofblocks(
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 xfs_mount_t *mp,
David Chinner92dfe8d2007-05-24 15:22:19 +10001167 xfs_inode_t *ip,
1168 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169{
1170 xfs_trans_t *tp;
1171 int error;
1172 xfs_fileoff_t end_fsb;
1173 xfs_fileoff_t last_fsb;
1174 xfs_filblks_t map_len;
1175 int nimaps;
1176 xfs_bmbt_irec_t imap;
David Chinner92dfe8d2007-05-24 15:22:19 +10001177 int use_iolock = (flags & XFS_FREE_EOF_LOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
1179 /*
1180 * Figure out if there are any blocks beyond the end
1181 * of the file. If not, then there is nothing to do.
1182 */
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10001183 end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
1185 map_len = last_fsb - end_fsb;
1186 if (map_len <= 0)
Jesper Juhl014c2542006-01-15 02:37:08 +01001187 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
1189 nimaps = 1;
1190 xfs_ilock(ip, XFS_ILOCK_SHARED);
Olaf Weber3e57ecf2006-06-09 14:48:12 +10001191 error = XFS_BMAPI(mp, NULL, &ip->i_iocore, end_fsb, map_len, 0,
1192 NULL, 0, &imap, &nimaps, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 xfs_iunlock(ip, XFS_ILOCK_SHARED);
1194
1195 if (!error && (nimaps != 0) &&
Yingping Lu68bdb6e2006-01-11 15:38:31 +11001196 (imap.br_startblock != HOLESTARTBLOCK ||
1197 ip->i_delayed_blks)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 /*
1199 * Attach the dquots to the inode up front.
1200 */
1201 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001202 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
1204 /*
1205 * There are blocks after the end of file.
1206 * Free them up now by truncating the file to
1207 * its current size.
1208 */
1209 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1210
1211 /*
1212 * Do the xfs_itruncate_start() call before
1213 * reserving any log space because
1214 * itruncate_start will call into the buffer
1215 * cache and we can't
1216 * do that within a transaction.
1217 */
David Chinner92dfe8d2007-05-24 15:22:19 +10001218 if (use_iolock)
1219 xfs_ilock(ip, XFS_IOLOCK_EXCL);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10001220 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE,
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10001221 ip->i_size);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10001222 if (error) {
Jesper Juhl87ae3c22007-06-28 16:43:14 +10001223 xfs_trans_cancel(tp, 0);
David Chinner92dfe8d2007-05-24 15:22:19 +10001224 if (use_iolock)
1225 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10001226 return error;
1227 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
1229 error = xfs_trans_reserve(tp, 0,
1230 XFS_ITRUNCATE_LOG_RES(mp),
1231 0, XFS_TRANS_PERM_LOG_RES,
1232 XFS_ITRUNCATE_LOG_COUNT);
1233 if (error) {
1234 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1235 xfs_trans_cancel(tp, 0);
1236 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +01001237 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 }
1239
1240 xfs_ilock(ip, XFS_ILOCK_EXCL);
1241 xfs_trans_ijoin(tp, ip,
1242 XFS_IOLOCK_EXCL |
1243 XFS_ILOCK_EXCL);
1244 xfs_trans_ihold(tp, ip);
1245
1246 error = xfs_itruncate_finish(&tp, ip,
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10001247 ip->i_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 XFS_DATA_FORK,
1249 0);
1250 /*
1251 * If we get an error at this point we
1252 * simply don't bother truncating the file.
1253 */
1254 if (error) {
1255 xfs_trans_cancel(tp,
1256 (XFS_TRANS_RELEASE_LOG_RES |
1257 XFS_TRANS_ABORT));
1258 } else {
1259 error = xfs_trans_commit(tp,
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001260 XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 }
David Chinner92dfe8d2007-05-24 15:22:19 +10001262 xfs_iunlock(ip, (use_iolock ? (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)
1263 : XFS_ILOCK_EXCL));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001265 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266}
1267
1268/*
1269 * Free a symlink that has blocks associated with it.
1270 */
1271STATIC int
1272xfs_inactive_symlink_rmt(
1273 xfs_inode_t *ip,
1274 xfs_trans_t **tpp)
1275{
1276 xfs_buf_t *bp;
1277 int committed;
1278 int done;
1279 int error;
1280 xfs_fsblock_t first_block;
1281 xfs_bmap_free_t free_list;
1282 int i;
1283 xfs_mount_t *mp;
1284 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
1285 int nmaps;
1286 xfs_trans_t *ntp;
1287 int size;
1288 xfs_trans_t *tp;
1289
1290 tp = *tpp;
1291 mp = ip->i_mount;
1292 ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
1293 /*
1294 * We're freeing a symlink that has some
1295 * blocks allocated to it. Free the
1296 * blocks here. We know that we've got
1297 * either 1 or 2 extents and that we can
1298 * free them all in one bunmapi call.
1299 */
1300 ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
1301 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
1302 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
1303 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1304 xfs_trans_cancel(tp, 0);
1305 *tpp = NULL;
1306 return error;
1307 }
1308 /*
1309 * Lock the inode, fix the size, and join it to the transaction.
1310 * Hold it so in the normal path, we still have it locked for
1311 * the second transaction. In the error paths we need it
1312 * held so the cancel won't rele it, see below.
1313 */
1314 xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1315 size = (int)ip->i_d.di_size;
1316 ip->i_d.di_size = 0;
1317 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1318 xfs_trans_ihold(tp, ip);
1319 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1320 /*
1321 * Find the block(s) so we can inval and unmap them.
1322 */
1323 done = 0;
1324 XFS_BMAP_INIT(&free_list, &first_block);
Tobias Klausere8c96f82006-03-24 03:15:34 -08001325 nmaps = ARRAY_SIZE(mval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
1327 XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
Olaf Weber3e57ecf2006-06-09 14:48:12 +10001328 &free_list, NULL)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 goto error0;
1330 /*
1331 * Invalidate the block(s).
1332 */
1333 for (i = 0; i < nmaps; i++) {
1334 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
1335 XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
1336 XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
1337 xfs_trans_binval(tp, bp);
1338 }
1339 /*
1340 * Unmap the dead block(s) to the free_list.
1341 */
1342 if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
Olaf Weber3e57ecf2006-06-09 14:48:12 +10001343 &first_block, &free_list, NULL, &done)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 goto error1;
1345 ASSERT(done);
1346 /*
1347 * Commit the first transaction. This logs the EFI and the inode.
1348 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001349 if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 goto error1;
1351 /*
1352 * The transaction must have been committed, since there were
1353 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
1354 * The new tp has the extent freeing and EFDs.
1355 */
1356 ASSERT(committed);
1357 /*
1358 * The first xact was committed, so add the inode to the new one.
1359 * Mark it dirty so it will be logged and moved forward in the log as
1360 * part of every commit.
1361 */
1362 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1363 xfs_trans_ihold(tp, ip);
1364 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1365 /*
1366 * Get a new, empty transaction to return to our caller.
1367 */
1368 ntp = xfs_trans_dup(tp);
1369 /*
Nathan Scottc41564b2006-03-29 08:55:14 +10001370 * Commit the transaction containing extent freeing and EFDs.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 * If we get an error on the commit here or on the reserve below,
1372 * we need to unlock the inode since the new transaction doesn't
1373 * have the inode attached.
1374 */
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001375 error = xfs_trans_commit(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 tp = ntp;
1377 if (error) {
1378 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1379 goto error0;
1380 }
1381 /*
1382 * Remove the memory for extent descriptions (just bookkeeping).
1383 */
1384 if (ip->i_df.if_bytes)
1385 xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
1386 ASSERT(ip->i_df.if_bytes == 0);
1387 /*
1388 * Put an itruncate log reservation in the new transaction
1389 * for our caller.
1390 */
1391 if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
1392 XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
1393 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1394 goto error0;
1395 }
1396 /*
1397 * Return with the inode locked but not joined to the transaction.
1398 */
1399 *tpp = tp;
1400 return 0;
1401
1402 error1:
1403 xfs_bmap_cancel(&free_list);
1404 error0:
1405 /*
1406 * Have to come here with the inode locked and either
1407 * (held and in the transaction) or (not in the transaction).
1408 * If the inode isn't held then cancel would iput it, but
1409 * that's wrong since this is inactive and the vnode ref
1410 * count is 0 already.
1411 * Cancel won't do anything to the inode if held, but it still
1412 * needs to be locked until the cancel is done, if it was
1413 * joined to the transaction.
1414 */
1415 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1416 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1417 *tpp = NULL;
1418 return error;
1419
1420}
1421
1422STATIC int
1423xfs_inactive_symlink_local(
1424 xfs_inode_t *ip,
1425 xfs_trans_t **tpp)
1426{
1427 int error;
1428
1429 ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip));
1430 /*
1431 * We're freeing a symlink which fit into
1432 * the inode. Just free the memory used
1433 * to hold the old symlink.
1434 */
1435 error = xfs_trans_reserve(*tpp, 0,
1436 XFS_ITRUNCATE_LOG_RES(ip->i_mount),
1437 0, XFS_TRANS_PERM_LOG_RES,
1438 XFS_ITRUNCATE_LOG_COUNT);
1439
1440 if (error) {
1441 xfs_trans_cancel(*tpp, 0);
1442 *tpp = NULL;
Jesper Juhl014c2542006-01-15 02:37:08 +01001443 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 }
1445 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1446
1447 /*
1448 * Zero length symlinks _can_ exist.
1449 */
1450 if (ip->i_df.if_bytes > 0) {
1451 xfs_idata_realloc(ip,
1452 -(ip->i_df.if_bytes),
1453 XFS_DATA_FORK);
1454 ASSERT(ip->i_df.if_bytes == 0);
1455 }
Jesper Juhl014c2542006-01-15 02:37:08 +01001456 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457}
1458
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459STATIC int
1460xfs_inactive_attrs(
1461 xfs_inode_t *ip,
1462 xfs_trans_t **tpp)
1463{
1464 xfs_trans_t *tp;
1465 int error;
1466 xfs_mount_t *mp;
1467
1468 ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
1469 tp = *tpp;
1470 mp = ip->i_mount;
1471 ASSERT(ip->i_d.di_forkoff != 0);
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001472 xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1474
1475 error = xfs_attr_inactive(ip);
1476 if (error) {
1477 *tpp = NULL;
1478 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +01001479 return error; /* goto out */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 }
1481
1482 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1483 error = xfs_trans_reserve(tp, 0,
1484 XFS_IFREE_LOG_RES(mp),
1485 0, XFS_TRANS_PERM_LOG_RES,
1486 XFS_INACTIVE_LOG_COUNT);
1487 if (error) {
1488 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1489 xfs_trans_cancel(tp, 0);
1490 *tpp = NULL;
1491 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +01001492 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 }
1494
1495 xfs_ilock(ip, XFS_ILOCK_EXCL);
1496 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1497 xfs_trans_ihold(tp, ip);
1498 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1499
1500 ASSERT(ip->i_d.di_anextents == 0);
1501
1502 *tpp = tp;
Jesper Juhl014c2542006-01-15 02:37:08 +01001503 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
1505
Christoph Hellwig993386c2007-08-28 16:12:30 +10001506int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507xfs_release(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001508 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001510 bhv_vnode_t *vp = XFS_ITOV(ip);
1511 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 int error;
1513
Nathan Scott7d4fb402006-06-09 15:27:16 +10001514 if (!VN_ISREG(vp) || (ip->i_d.di_mode == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
1517 /* If this is a read-only mount, don't do this (would generate I/O) */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +10001518 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 return 0;
1520
David Chinner2a82b8b2007-07-11 11:09:12 +10001521 if (!XFS_FORCED_SHUTDOWN(mp)) {
Christoph Hellwigb3aea4e2007-08-29 11:44:37 +10001522 int truncated;
1523
David Chinner2a82b8b2007-07-11 11:09:12 +10001524 /*
1525 * If we are using filestreams, and we have an unlinked
1526 * file that we are processing the last close on, then nothing
1527 * will be able to reopen and write to this file. Purge this
1528 * inode from the filestreams cache so that it doesn't delay
1529 * teardown of the inode.
1530 */
1531 if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip))
1532 xfs_filestream_deassociate(ip);
1533
Christoph Hellwigfbf3ce82007-06-28 16:46:47 +10001534 /*
1535 * If we previously truncated this file and removed old data
1536 * in the process, we want to initiate "early" writeout on
1537 * the last close. This is an attempt to combat the notorious
1538 * NULL files problem which is particularly noticable from a
1539 * truncate down, buffered (re-)write (delalloc), followed by
1540 * a crash. What we are effectively doing here is
1541 * significantly reducing the time window where we'd otherwise
1542 * be exposed to that problem.
1543 */
Christoph Hellwig09262b42007-08-29 11:44:50 +10001544 truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
Christoph Hellwigb3aea4e2007-08-29 11:44:37 +10001545 if (truncated && VN_DIRTY(vp) && ip->i_delayed_blks > 0)
Christoph Hellwig739bfb22007-08-29 10:58:01 +10001546 xfs_flush_pages(ip, 0, -1, XFS_B_ASYNC, FI_NONE);
Christoph Hellwigfbf3ce82007-06-28 16:46:47 +10001547 }
1548
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549#ifdef HAVE_REFCACHE
1550 /* If we are in the NFS reference cache then don't do this now */
1551 if (ip->i_refcache)
1552 return 0;
1553#endif
1554
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 if (ip->i_d.di_nlink != 0) {
1556 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10001557 ((ip->i_size > 0) || (VN_CACHED(vp) > 0 ||
Yingping Lu68bdb6e2006-01-11 15:38:31 +11001558 ip->i_delayed_blks > 0)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 (ip->i_df.if_flags & XFS_IFEXTENTS)) &&
Nathan Scottdd9f4382006-01-11 15:28:28 +11001560 (!(ip->i_d.di_flags &
1561 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) {
David Chinner92dfe8d2007-05-24 15:22:19 +10001562 error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK);
1563 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01001564 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 /* Update linux inode block count after free above */
Nathan Scottec86dc02006-03-17 17:25:36 +11001566 vn_to_inode(vp)->i_blocks = XFS_FSB_TO_BB(mp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 ip->i_d.di_nblocks + ip->i_delayed_blks);
1568 }
1569 }
1570
1571 return 0;
1572}
1573
1574/*
1575 * xfs_inactive
1576 *
1577 * This is called when the vnode reference count for the vnode
1578 * goes to zero. If the file has been unlinked, then it must
1579 * now be truncated. Also, we clear all of the read-ahead state
1580 * kept for the inode here since the file is now closed.
1581 */
Christoph Hellwig993386c2007-08-28 16:12:30 +10001582int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583xfs_inactive(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001584 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001586 bhv_vnode_t *vp = XFS_ITOV(ip);
Nathan Scott67fcaa72006-06-09 17:00:52 +10001587 xfs_bmap_free_t free_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 xfs_fsblock_t first_block;
1589 int committed;
1590 xfs_trans_t *tp;
1591 xfs_mount_t *mp;
1592 int error;
1593 int truncate;
1594
Christoph Hellwig1543d792007-08-29 11:46:47 +10001595 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 /*
1598 * If the inode is already free, then there can be nothing
1599 * to clean up here.
1600 */
1601 if (ip->i_d.di_mode == 0 || VN_BAD(vp)) {
1602 ASSERT(ip->i_df.if_real_bytes == 0);
1603 ASSERT(ip->i_df.if_broot_bytes == 0);
1604 return VN_INACTIVE_CACHE;
1605 }
1606
1607 /*
1608 * Only do a truncate if it's a regular file with
1609 * some actual space in it. It's OK to look at the
1610 * inode's fields without the lock because we're the
1611 * only one with a reference to the inode.
1612 */
1613 truncate = ((ip->i_d.di_nlink == 0) &&
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10001614 ((ip->i_d.di_size != 0) || (ip->i_size != 0) ||
1615 (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 ((ip->i_d.di_mode & S_IFMT) == S_IFREG));
1617
1618 mp = ip->i_mount;
1619
Christoph Hellwigeb9df392007-08-16 18:42:07 +10001620 if (ip->i_d.di_nlink == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_DESTROY)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 (void) XFS_SEND_DESTROY(mp, vp, DM_RIGHT_NULL);
1622 }
1623
1624 error = 0;
1625
1626 /* If this is a read-only mount, don't do this (would generate I/O) */
Christoph Hellwigbd186aa2007-08-30 17:21:12 +10001627 if (mp->m_flags & XFS_MOUNT_RDONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 goto out;
1629
1630 if (ip->i_d.di_nlink != 0) {
1631 if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) &&
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10001632 ((ip->i_size > 0) || (VN_CACHED(vp) > 0 ||
Yingping Lu68bdb6e2006-01-11 15:38:31 +11001633 ip->i_delayed_blks > 0)) &&
Nathan Scottdd9f4382006-01-11 15:28:28 +11001634 (ip->i_df.if_flags & XFS_IFEXTENTS) &&
1635 (!(ip->i_d.di_flags &
1636 (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) ||
1637 (ip->i_delayed_blks != 0)))) {
David Chinner92dfe8d2007-05-24 15:22:19 +10001638 error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK);
1639 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01001640 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 /* Update linux inode block count after free above */
Nathan Scottec86dc02006-03-17 17:25:36 +11001642 vn_to_inode(vp)->i_blocks = XFS_FSB_TO_BB(mp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 ip->i_d.di_nblocks + ip->i_delayed_blks);
1644 }
1645 goto out;
1646 }
1647
1648 ASSERT(ip->i_d.di_nlink == 0);
1649
1650 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
Jesper Juhl014c2542006-01-15 02:37:08 +01001651 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001652
1653 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
1654 if (truncate) {
1655 /*
1656 * Do the xfs_itruncate_start() call before
1657 * reserving any log space because itruncate_start
1658 * will call into the buffer cache and we can't
1659 * do that within a transaction.
1660 */
1661 xfs_ilock(ip, XFS_IOLOCK_EXCL);
1662
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10001663 error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0);
1664 if (error) {
Jesper Juhl87ae3c22007-06-28 16:43:14 +10001665 xfs_trans_cancel(tp, 0);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10001666 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1667 return VN_INACTIVE_CACHE;
1668 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669
1670 error = xfs_trans_reserve(tp, 0,
1671 XFS_ITRUNCATE_LOG_RES(mp),
1672 0, XFS_TRANS_PERM_LOG_RES,
1673 XFS_ITRUNCATE_LOG_COUNT);
1674 if (error) {
1675 /* Don't call itruncate_cleanup */
1676 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1677 xfs_trans_cancel(tp, 0);
1678 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +01001679 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 }
1681
1682 xfs_ilock(ip, XFS_ILOCK_EXCL);
1683 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1684 xfs_trans_ihold(tp, ip);
1685
1686 /*
1687 * normally, we have to run xfs_itruncate_finish sync.
1688 * But if filesystem is wsync and we're in the inactive
1689 * path, then we know that nlink == 0, and that the
1690 * xaction that made nlink == 0 is permanently committed
1691 * since xfs_remove runs as a synchronous transaction.
1692 */
1693 error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK,
1694 (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0));
1695
1696 if (error) {
1697 xfs_trans_cancel(tp,
1698 XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1699 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
Jesper Juhl014c2542006-01-15 02:37:08 +01001700 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 }
1702 } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) {
1703
1704 /*
1705 * If we get an error while cleaning up a
1706 * symlink we bail out.
1707 */
1708 error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ?
1709 xfs_inactive_symlink_rmt(ip, &tp) :
1710 xfs_inactive_symlink_local(ip, &tp);
1711
1712 if (error) {
1713 ASSERT(tp == NULL);
Jesper Juhl014c2542006-01-15 02:37:08 +01001714 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715 }
1716
1717 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1718 xfs_trans_ihold(tp, ip);
1719 } else {
1720 error = xfs_trans_reserve(tp, 0,
1721 XFS_IFREE_LOG_RES(mp),
1722 0, XFS_TRANS_PERM_LOG_RES,
1723 XFS_INACTIVE_LOG_COUNT);
1724 if (error) {
1725 ASSERT(XFS_FORCED_SHUTDOWN(mp));
1726 xfs_trans_cancel(tp, 0);
Jesper Juhl014c2542006-01-15 02:37:08 +01001727 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 }
1729
1730 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1731 xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1732 xfs_trans_ihold(tp, ip);
1733 }
1734
1735 /*
1736 * If there are attributes associated with the file
1737 * then blow them away now. The code calls a routine
1738 * that recursively deconstructs the attribute fork.
1739 * We need to just commit the current transaction
1740 * because we can't use it for xfs_attr_inactive().
1741 */
1742 if (ip->i_d.di_anextents > 0) {
1743 error = xfs_inactive_attrs(ip, &tp);
1744 /*
1745 * If we got an error, the transaction is already
1746 * cancelled, and the inode is unlocked. Just get out.
1747 */
1748 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01001749 return VN_INACTIVE_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 } else if (ip->i_afp) {
1751 xfs_idestroy_fork(ip, XFS_ATTR_FORK);
1752 }
1753
1754 /*
1755 * Free the inode.
1756 */
1757 XFS_BMAP_INIT(&free_list, &first_block);
1758 error = xfs_ifree(tp, ip, &free_list);
1759 if (error) {
1760 /*
1761 * If we fail to free the inode, shut down. The cancel
1762 * might do that, we need to make sure. Otherwise the
1763 * inode might be lost for a long time or forever.
1764 */
1765 if (!XFS_FORCED_SHUTDOWN(mp)) {
1766 cmn_err(CE_NOTE,
1767 "xfs_inactive: xfs_ifree() returned an error = %d on %s",
1768 error, mp->m_fsname);
Nathan Scott7d04a332006-06-09 14:58:38 +10001769 xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 }
1771 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
1772 } else {
1773 /*
1774 * Credit the quota account(s). The inode is gone.
1775 */
1776 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
1777
1778 /*
1779 * Just ignore errors at this point. There is
1780 * nothing we can do except to try to keep going.
1781 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001782 (void) xfs_bmap_finish(&tp, &free_list, &committed);
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001783 (void) xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 }
1785 /*
1786 * Release the dquots held by inode, if any.
1787 */
1788 XFS_QM_DQDETACH(mp, ip);
1789
1790 xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
1791
1792 out:
1793 return VN_INACTIVE_CACHE;
1794}
1795
1796
Christoph Hellwig993386c2007-08-28 16:12:30 +10001797int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798xfs_lookup(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001799 xfs_inode_t *dp,
Nathan Scott8285fb52006-06-09 17:07:12 +10001800 bhv_vname_t *dentry,
Christoph Hellwig993386c2007-08-28 16:12:30 +10001801 bhv_vnode_t **vpp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802{
Christoph Hellwig993386c2007-08-28 16:12:30 +10001803 xfs_inode_t *ip;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 xfs_ino_t e_inum;
1805 int error;
1806 uint lock_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807
Christoph Hellwig1543d792007-08-29 11:46:47 +10001808 vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809
1810 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
1811 return XFS_ERROR(EIO);
1812
1813 lock_mode = xfs_ilock_map_shared(dp);
Christoph Hellwig993386c2007-08-28 16:12:30 +10001814 error = xfs_dir_lookup_int(dp, lock_mode, dentry, &e_inum, &ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815 if (!error) {
1816 *vpp = XFS_ITOV(ip);
1817 ITRACE(ip);
1818 }
1819 xfs_iunlock_map_shared(dp, lock_mode);
1820 return error;
1821}
1822
Christoph Hellwig993386c2007-08-28 16:12:30 +10001823int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824xfs_create(
Christoph Hellwig993386c2007-08-28 16:12:30 +10001825 xfs_inode_t *dp,
Nathan Scott8285fb52006-06-09 17:07:12 +10001826 bhv_vname_t *dentry,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10001827 mode_t mode,
1828 xfs_dev_t rdev,
Nathan Scott67fcaa72006-06-09 17:00:52 +10001829 bhv_vnode_t **vpp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830 cred_t *credp)
1831{
1832 char *name = VNAME(dentry);
Christoph Hellwig993386c2007-08-28 16:12:30 +10001833 xfs_mount_t *mp = dp->i_mount;
1834 bhv_vnode_t *dir_vp = XFS_ITOV(dp);
1835 xfs_inode_t *ip;
Nathan Scott67fcaa72006-06-09 17:00:52 +10001836 bhv_vnode_t *vp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 int error;
1839 xfs_bmap_free_t free_list;
1840 xfs_fsblock_t first_block;
Christoph Hellwig993386c2007-08-28 16:12:30 +10001841 boolean_t unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 int dm_event_sent = 0;
1843 uint cancel_flags;
1844 int committed;
1845 xfs_prid_t prid;
1846 struct xfs_dquot *udqp, *gdqp;
1847 uint resblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848 int namelen;
1849
1850 ASSERT(!*vpp);
Christoph Hellwig1543d792007-08-29 11:46:47 +10001851 vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 namelen = VNAMELEN(dentry);
1854
Christoph Hellwigeb9df392007-08-16 18:42:07 +10001855 if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
1857 dir_vp, DM_RIGHT_NULL, NULL,
1858 DM_RIGHT_NULL, name, NULL,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10001859 mode, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860
1861 if (error)
1862 return error;
1863 dm_event_sent = 1;
1864 }
1865
1866 if (XFS_FORCED_SHUTDOWN(mp))
1867 return XFS_ERROR(EIO);
1868
1869 /* Return through std_return after this point. */
1870
1871 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10001872 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
1873 prid = dp->i_d.di_projid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 else
1875 prid = (xfs_prid_t)dfltprid;
1876
1877 /*
1878 * Make sure that we have allocated dquot(s) on disk.
1879 */
1880 error = XFS_QM_DQVOPALLOC(mp, dp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001881 current_fsuid(credp), current_fsgid(credp), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp);
1883 if (error)
1884 goto std_return;
1885
1886 ip = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887
1888 tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE);
1889 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
1890 resblks = XFS_CREATE_SPACE_RES(mp, namelen);
1891 /*
1892 * Initially assume that the file does not exist and
1893 * reserve the resources for that case. If that is not
1894 * the case we'll drop the one we have and get a more
1895 * appropriate transaction later.
1896 */
1897 error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0,
1898 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1899 if (error == ENOSPC) {
1900 resblks = 0;
1901 error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0,
1902 XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT);
1903 }
1904 if (error) {
1905 cancel_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 goto error_return;
1907 }
1908
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10001909 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
Christoph Hellwig993386c2007-08-28 16:12:30 +10001910 unlock_dp_on_error = B_TRUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
1912 XFS_BMAP_INIT(&free_list, &first_block);
1913
1914 ASSERT(ip == NULL);
1915
1916 /*
1917 * Reserve disk quota and the inode.
1918 */
1919 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
1920 if (error)
1921 goto error_return;
1922
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10001923 if (resblks == 0 && (error = xfs_dir_canenter(tp, dp, name, namelen)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 goto error_return;
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10001925 error = xfs_dir_ialloc(&tp, dp, mode, 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 rdev, credp, prid, resblks > 0,
1927 &ip, &committed);
1928 if (error) {
1929 if (error == ENOSPC)
1930 goto error_return;
1931 goto abort_return;
1932 }
1933 ITRACE(ip);
1934
1935 /*
1936 * At this point, we've gotten a newly allocated inode.
1937 * It is locked (and joined to the transaction).
1938 */
1939
1940 ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE));
1941
1942 /*
Christoph Hellwig993386c2007-08-28 16:12:30 +10001943 * Now we join the directory inode to the transaction. We do not do it
1944 * earlier because xfs_dir_ialloc might commit the previous transaction
1945 * (and release all the locks). An error from here on will result in
1946 * the transaction cancel unlocking dp so don't do it explicitly in the
1947 * error path.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 VN_HOLD(dir_vp);
1950 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
Christoph Hellwig993386c2007-08-28 16:12:30 +10001951 unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10001953 error = xfs_dir_createname(tp, dp, name, namelen, ip->i_ino,
1954 &first_block, &free_list, resblks ?
1955 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 if (error) {
1957 ASSERT(error != ENOSPC);
1958 goto abort_return;
1959 }
1960 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
1961 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
1962
1963 /*
1964 * If this is a synchronous mount, make sure that the
1965 * create transaction goes to disk before returning to
1966 * the user.
1967 */
1968 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
1969 xfs_trans_set_sync(tp);
1970 }
1971
1972 dp->i_gen++;
1973
1974 /*
1975 * Attach the dquot(s) to the inodes and modify them incore.
1976 * These ids of the inode couldn't have changed since the new
1977 * inode has been locked ever since it was created.
1978 */
1979 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
1980
1981 /*
1982 * xfs_trans_commit normally decrements the vnode ref count
1983 * when it unlocks the inode. Since we want to return the
1984 * vnode to the caller, we bump the vnode ref count now.
1985 */
1986 IHOLD(ip);
1987 vp = XFS_ITOV(ip);
1988
Eric Sandeenf7c99b62007-02-10 18:37:16 +11001989 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 if (error) {
1991 xfs_bmap_cancel(&free_list);
1992 goto abort_rele;
1993 }
1994
Eric Sandeen1c72bf92007-05-08 13:48:42 +10001995 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 if (error) {
1997 IRELE(ip);
1998 tp = NULL;
1999 goto error_return;
2000 }
2001
2002 XFS_QM_DQRELE(mp, udqp);
2003 XFS_QM_DQRELE(mp, gdqp);
2004
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 *vpp = vp;
2006
2007 /* Fallthrough to std_return with error = 0 */
2008
2009std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002010 if ((*vpp || (error != 0 && dm_event_sent != 0)) &&
Christoph Hellwig993386c2007-08-28 16:12:30 +10002011 DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
2013 dir_vp, DM_RIGHT_NULL,
2014 *vpp ? vp:NULL,
2015 DM_RIGHT_NULL, name, NULL,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10002016 mode, error, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 }
2018 return error;
2019
2020 abort_return:
2021 cancel_flags |= XFS_TRANS_ABORT;
2022 /* FALLTHROUGH */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023
Jesper Juhl014c2542006-01-15 02:37:08 +01002024 error_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 if (tp != NULL)
2026 xfs_trans_cancel(tp, cancel_flags);
2027
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 XFS_QM_DQRELE(mp, udqp);
2029 XFS_QM_DQRELE(mp, gdqp);
2030
Christoph Hellwig993386c2007-08-28 16:12:30 +10002031 if (unlock_dp_on_error)
2032 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2033
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034 goto std_return;
2035
2036 abort_rele:
2037 /*
2038 * Wait until after the current transaction is aborted to
2039 * release the inode. This prevents recursive transactions
2040 * and deadlocks from xfs_inactive.
2041 */
2042 cancel_flags |= XFS_TRANS_ABORT;
2043 xfs_trans_cancel(tp, cancel_flags);
2044 IRELE(ip);
2045
2046 XFS_QM_DQRELE(mp, udqp);
2047 XFS_QM_DQRELE(mp, gdqp);
2048
2049 goto std_return;
2050}
2051
2052#ifdef DEBUG
2053/*
2054 * Some counters to see if (and how often) we are hitting some deadlock
2055 * prevention code paths.
2056 */
2057
2058int xfs_rm_locks;
2059int xfs_rm_lock_delays;
2060int xfs_rm_attempts;
2061#endif
2062
2063/*
2064 * The following routine will lock the inodes associated with the
2065 * directory and the named entry in the directory. The locks are
2066 * acquired in increasing inode number.
2067 *
2068 * If the entry is "..", then only the directory is locked. The
2069 * vnode ref count will still include that from the .. entry in
2070 * this case.
2071 *
2072 * There is a deadlock we need to worry about. If the locked directory is
2073 * in the AIL, it might be blocking up the log. The next inode we lock
2074 * could be already locked by another thread waiting for log space (e.g
2075 * a permanent log reservation with a long running transaction (see
2076 * xfs_itruncate_finish)). To solve this, we must check if the directory
2077 * is in the ail and use lock_nowait. If we can't lock, we need to
2078 * drop the inode lock on the directory and try again. xfs_iunlock will
2079 * potentially push the tail if we were holding up the log.
2080 */
2081STATIC int
2082xfs_lock_dir_and_entry(
2083 xfs_inode_t *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 xfs_inode_t *ip) /* inode of entry 'name' */
2085{
2086 int attempts;
2087 xfs_ino_t e_inum;
2088 xfs_inode_t *ips[2];
2089 xfs_log_item_t *lp;
2090
2091#ifdef DEBUG
2092 xfs_rm_locks++;
2093#endif
2094 attempts = 0;
2095
2096again:
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002097 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098
2099 e_inum = ip->i_ino;
2100
2101 ITRACE(ip);
2102
2103 /*
2104 * We want to lock in increasing inum. Since we've already
2105 * acquired the lock on the directory, we may need to release
2106 * if if the inum of the entry turns out to be less.
2107 */
2108 if (e_inum > dp->i_ino) {
2109 /*
2110 * We are already in the right order, so just
2111 * lock on the inode of the entry.
2112 * We need to use nowait if dp is in the AIL.
2113 */
2114
2115 lp = (xfs_log_item_t *)dp->i_itemp;
2116 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
2117 if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
2118 attempts++;
2119#ifdef DEBUG
2120 xfs_rm_attempts++;
2121#endif
2122
2123 /*
2124 * Unlock dp and try again.
2125 * xfs_iunlock will try to push the tail
2126 * if the inode is in the AIL.
2127 */
2128
2129 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2130
2131 if ((attempts % 5) == 0) {
2132 delay(1); /* Don't just spin the CPU */
2133#ifdef DEBUG
2134 xfs_rm_lock_delays++;
2135#endif
2136 }
2137 goto again;
2138 }
2139 } else {
2140 xfs_ilock(ip, XFS_ILOCK_EXCL);
2141 }
2142 } else if (e_inum < dp->i_ino) {
2143 xfs_iunlock(dp, XFS_ILOCK_EXCL);
2144
2145 ips[0] = ip;
2146 ips[1] = dp;
2147 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
2148 }
2149 /* else e_inum == dp->i_ino */
2150 /* This can happen if we're asked to lock /x/..
2151 * the entry is "..", which is also the parent directory.
2152 */
2153
2154 return 0;
2155}
2156
2157#ifdef DEBUG
2158int xfs_locked_n;
2159int xfs_small_retries;
2160int xfs_middle_retries;
2161int xfs_lots_retries;
2162int xfs_lock_delays;
2163#endif
2164
2165/*
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002166 * Bump the subclass so xfs_lock_inodes() acquires each lock with
2167 * a different value
2168 */
2169static inline int
2170xfs_lock_inumorder(int lock_mode, int subclass)
2171{
2172 if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
David Chinner0f1145c2007-06-29 17:26:09 +10002173 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002174 if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
David Chinner0f1145c2007-06-29 17:26:09 +10002175 lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT;
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002176
2177 return lock_mode;
2178}
2179
2180/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 * The following routine will lock n inodes in exclusive mode.
2182 * We assume the caller calls us with the inodes in i_ino order.
2183 *
2184 * We need to detect deadlock where an inode that we lock
2185 * is in the AIL and we start waiting for another inode that is locked
2186 * by a thread in a long running transaction (such as truncate). This can
2187 * result in deadlock since the long running trans might need to wait
2188 * for the inode we just locked in order to push the tail and free space
2189 * in the log.
2190 */
2191void
2192xfs_lock_inodes(
2193 xfs_inode_t **ips,
2194 int inodes,
2195 int first_locked,
2196 uint lock_mode)
2197{
2198 int attempts = 0, i, j, try_lock;
2199 xfs_log_item_t *lp;
2200
2201 ASSERT(ips && (inodes >= 2)); /* we need at least two */
2202
2203 if (first_locked) {
2204 try_lock = 1;
2205 i = 1;
2206 } else {
2207 try_lock = 0;
2208 i = 0;
2209 }
2210
2211again:
2212 for (; i < inodes; i++) {
2213 ASSERT(ips[i]);
2214
2215 if (i && (ips[i] == ips[i-1])) /* Already locked */
2216 continue;
2217
2218 /*
2219 * If try_lock is not set yet, make sure all locked inodes
2220 * are not in the AIL.
2221 * If any are, set try_lock to be used later.
2222 */
2223
2224 if (!try_lock) {
2225 for (j = (i - 1); j >= 0 && !try_lock; j--) {
2226 lp = (xfs_log_item_t *)ips[j]->i_itemp;
2227 if (lp && (lp->li_flags & XFS_LI_IN_AIL)) {
2228 try_lock++;
2229 }
2230 }
2231 }
2232
2233 /*
2234 * If any of the previous locks we have locked is in the AIL,
2235 * we must TRY to get the second and subsequent locks. If
2236 * we can't get any, we must release all we have
2237 * and try again.
2238 */
2239
2240 if (try_lock) {
2241 /* try_lock must be 0 if i is 0. */
2242 /*
2243 * try_lock means we have an inode locked
2244 * that is in the AIL.
2245 */
2246 ASSERT(i != 0);
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002247 if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 attempts++;
2249
2250 /*
2251 * Unlock all previous guys and try again.
2252 * xfs_iunlock will try to push the tail
2253 * if the inode is in the AIL.
2254 */
2255
2256 for(j = i - 1; j >= 0; j--) {
2257
2258 /*
2259 * Check to see if we've already
2260 * unlocked this one.
2261 * Not the first one going back,
2262 * and the inode ptr is the same.
2263 */
2264 if ((j != (i - 1)) && ips[j] ==
2265 ips[j+1])
2266 continue;
2267
2268 xfs_iunlock(ips[j], lock_mode);
2269 }
2270
2271 if ((attempts % 5) == 0) {
2272 delay(1); /* Don't just spin the CPU */
2273#ifdef DEBUG
2274 xfs_lock_delays++;
2275#endif
2276 }
2277 i = 0;
2278 try_lock = 0;
2279 goto again;
2280 }
2281 } else {
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002282 xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 }
2284 }
2285
2286#ifdef DEBUG
2287 if (attempts) {
2288 if (attempts < 5) xfs_small_retries++;
2289 else if (attempts < 100) xfs_middle_retries++;
2290 else xfs_lots_retries++;
2291 } else {
2292 xfs_locked_n++;
2293 }
2294#endif
2295}
2296
2297#ifdef DEBUG
2298#define REMOVE_DEBUG_TRACE(x) {remove_which_error_return = (x);}
2299int remove_which_error_return = 0;
2300#else /* ! DEBUG */
2301#define REMOVE_DEBUG_TRACE(x)
2302#endif /* ! DEBUG */
2303
Christoph Hellwig993386c2007-08-28 16:12:30 +10002304int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002305xfs_remove(
Christoph Hellwig993386c2007-08-28 16:12:30 +10002306 xfs_inode_t *dp,
2307 bhv_vname_t *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308{
Christoph Hellwig993386c2007-08-28 16:12:30 +10002309 bhv_vnode_t *dir_vp = XFS_ITOV(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002310 char *name = VNAME(dentry);
Christoph Hellwig993386c2007-08-28 16:12:30 +10002311 xfs_mount_t *mp = dp->i_mount;
2312 xfs_inode_t *ip;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 xfs_trans_t *tp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002314 int error = 0;
2315 xfs_bmap_free_t free_list;
2316 xfs_fsblock_t first_block;
2317 int cancel_flags;
2318 int committed;
2319 int dm_di_mode = 0;
2320 int link_zero;
2321 uint resblks;
2322 int namelen;
2323
Christoph Hellwig1543d792007-08-29 11:46:47 +10002324 vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326 if (XFS_FORCED_SHUTDOWN(mp))
2327 return XFS_ERROR(EIO);
2328
2329 namelen = VNAMELEN(dentry);
2330
Vlad Apostolov17370092006-09-28 11:02:30 +10002331 if (!xfs_get_dir_entry(dentry, &ip)) {
2332 dm_di_mode = ip->i_d.di_mode;
2333 IRELE(ip);
2334 }
2335
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002336 if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002337 error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp,
2338 DM_RIGHT_NULL, NULL, DM_RIGHT_NULL,
Vlad Apostolov17370092006-09-28 11:02:30 +10002339 name, NULL, dm_di_mode, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 if (error)
2341 return error;
2342 }
2343
2344 /* From this point on, return through std_return */
2345 ip = NULL;
2346
2347 /*
2348 * We need to get a reference to ip before we get our log
2349 * reservation. The reason for this is that we cannot call
2350 * xfs_iget for an inode for which we do not have a reference
2351 * once we've acquired a log reservation. This is because the
2352 * inode we are trying to get might be in xfs_inactive going
2353 * for a log reservation. Since we'll have to wait for the
2354 * inactive code to complete before returning from xfs_iget,
2355 * we need to make sure that we don't have log space reserved
Nathan Scottc41564b2006-03-29 08:55:14 +10002356 * when we call xfs_iget. Instead we get an unlocked reference
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 * to the inode before getting our log reservation.
2358 */
2359 error = xfs_get_dir_entry(dentry, &ip);
2360 if (error) {
2361 REMOVE_DEBUG_TRACE(__LINE__);
2362 goto std_return;
2363 }
2364
2365 dm_di_mode = ip->i_d.di_mode;
2366
Christoph Hellwig1543d792007-08-29 11:46:47 +10002367 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368
2369 ITRACE(ip);
2370
2371 error = XFS_QM_DQATTACH(mp, dp, 0);
2372 if (!error && dp != ip)
2373 error = XFS_QM_DQATTACH(mp, ip, 0);
2374 if (error) {
2375 REMOVE_DEBUG_TRACE(__LINE__);
2376 IRELE(ip);
2377 goto std_return;
2378 }
2379
2380 tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE);
2381 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2382 /*
2383 * We try to get the real space reservation first,
2384 * allowing for directory btree deletion(s) implying
2385 * possible bmap insert(s). If we can't get the space
2386 * reservation then we use 0 instead, and avoid the bmap
2387 * btree insert(s) in the directory code by, if the bmap
2388 * insert tries to happen, instead trimming the LAST
2389 * block from the directory.
2390 */
2391 resblks = XFS_REMOVE_SPACE_RES(mp);
2392 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
2393 XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT);
2394 if (error == ENOSPC) {
2395 resblks = 0;
2396 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
2397 XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT);
2398 }
2399 if (error) {
2400 ASSERT(error != ENOSPC);
2401 REMOVE_DEBUG_TRACE(__LINE__);
2402 xfs_trans_cancel(tp, 0);
2403 IRELE(ip);
2404 return error;
2405 }
2406
Eric Sandeene9ed9d22007-05-08 13:48:56 +10002407 error = xfs_lock_dir_and_entry(dp, ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002408 if (error) {
2409 REMOVE_DEBUG_TRACE(__LINE__);
2410 xfs_trans_cancel(tp, cancel_flags);
2411 IRELE(ip);
2412 goto std_return;
2413 }
2414
2415 /*
2416 * At this point, we've gotten both the directory and the entry
2417 * inodes locked.
2418 */
2419 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
2420 if (dp != ip) {
2421 /*
2422 * Increment vnode ref count only in this case since
2423 * there's an extra vnode reference in the case where
2424 * dp == ip.
2425 */
2426 IHOLD(dp);
2427 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
2428 }
2429
2430 /*
2431 * Entry must exist since we did a lookup in xfs_lock_dir_and_entry.
2432 */
2433 XFS_BMAP_INIT(&free_list, &first_block);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002434 error = xfs_dir_removename(tp, dp, name, namelen, ip->i_ino,
2435 &first_block, &free_list, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 if (error) {
2437 ASSERT(error != ENOENT);
2438 REMOVE_DEBUG_TRACE(__LINE__);
2439 goto error1;
2440 }
2441 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2442
2443 dp->i_gen++;
2444 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
2445
2446 error = xfs_droplink(tp, ip);
2447 if (error) {
2448 REMOVE_DEBUG_TRACE(__LINE__);
2449 goto error1;
2450 }
2451
2452 /* Determine if this is the last link while
2453 * we are in the transaction.
2454 */
2455 link_zero = (ip)->i_d.di_nlink==0;
2456
2457 /*
2458 * Take an extra ref on the inode so that it doesn't
2459 * go to xfs_inactive() from within the commit.
2460 */
2461 IHOLD(ip);
2462
2463 /*
2464 * If this is a synchronous mount, make sure that the
2465 * remove transaction goes to disk before returning to
2466 * the user.
2467 */
2468 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2469 xfs_trans_set_sync(tp);
2470 }
2471
Eric Sandeenf7c99b62007-02-10 18:37:16 +11002472 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473 if (error) {
2474 REMOVE_DEBUG_TRACE(__LINE__);
2475 goto error_rele;
2476 }
2477
Eric Sandeen1c72bf92007-05-08 13:48:42 +10002478 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002479 if (error) {
2480 IRELE(ip);
2481 goto std_return;
2482 }
2483
2484 /*
2485 * Before we drop our extra reference to the inode, purge it
2486 * from the refcache if it is there. By waiting until afterwards
2487 * to do the IRELE, we ensure that we won't go inactive in the
2488 * xfs_refcache_purge_ip routine (although that would be OK).
2489 */
2490 xfs_refcache_purge_ip(ip);
2491
David Chinner2a82b8b2007-07-11 11:09:12 +10002492 /*
2493 * If we are using filestreams, kill the stream association.
2494 * If the file is still open it may get a new one but that
2495 * will get killed on last close in xfs_close() so we don't
2496 * have to worry about that.
2497 */
2498 if (link_zero && xfs_inode_is_filestream(ip))
2499 xfs_filestream_deassociate(ip);
2500
Christoph Hellwig1543d792007-08-29 11:46:47 +10002501 vn_trace_exit(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 IRELE(ip);
2504
2505/* Fall through to std_return with error = 0 */
2506 std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002507 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE,
2509 dir_vp, DM_RIGHT_NULL,
2510 NULL, DM_RIGHT_NULL,
2511 name, NULL, dm_di_mode, error, 0);
2512 }
2513 return error;
2514
2515 error1:
2516 xfs_bmap_cancel(&free_list);
2517 cancel_flags |= XFS_TRANS_ABORT;
2518 xfs_trans_cancel(tp, cancel_flags);
2519 goto std_return;
2520
2521 error_rele:
2522 /*
2523 * In this case make sure to not release the inode until after
2524 * the current transaction is aborted. Releasing it beforehand
2525 * can cause us to go to xfs_inactive and start a recursive
2526 * transaction which can easily deadlock with the current one.
2527 */
2528 xfs_bmap_cancel(&free_list);
2529 cancel_flags |= XFS_TRANS_ABORT;
2530 xfs_trans_cancel(tp, cancel_flags);
2531
2532 /*
2533 * Before we drop our extra reference to the inode, purge it
2534 * from the refcache if it is there. By waiting until afterwards
2535 * to do the IRELE, we ensure that we won't go inactive in the
2536 * xfs_refcache_purge_ip routine (although that would be OK).
2537 */
2538 xfs_refcache_purge_ip(ip);
2539
2540 IRELE(ip);
2541
2542 goto std_return;
2543}
2544
Christoph Hellwig993386c2007-08-28 16:12:30 +10002545int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546xfs_link(
Christoph Hellwig993386c2007-08-28 16:12:30 +10002547 xfs_inode_t *tdp,
Nathan Scott67fcaa72006-06-09 17:00:52 +10002548 bhv_vnode_t *src_vp,
Christoph Hellwig993386c2007-08-28 16:12:30 +10002549 bhv_vname_t *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550{
Christoph Hellwig993386c2007-08-28 16:12:30 +10002551 bhv_vnode_t *target_dir_vp = XFS_ITOV(tdp);
2552 xfs_mount_t *mp = tdp->i_mount;
2553 xfs_inode_t *sip = xfs_vtoi(src_vp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002555 xfs_inode_t *ips[2];
2556 int error;
2557 xfs_bmap_free_t free_list;
2558 xfs_fsblock_t first_block;
2559 int cancel_flags;
2560 int committed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002561 int resblks;
2562 char *target_name = VNAME(dentry);
2563 int target_namelen;
2564
Christoph Hellwig1543d792007-08-29 11:46:47 +10002565 vn_trace_entry(tdp, __FUNCTION__, (inst_t *)__return_address);
2566 vn_trace_entry(xfs_vtoi(src_vp), __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002567
2568 target_namelen = VNAMELEN(dentry);
Alexey Dobriyanb71d3002006-06-27 12:45:17 +10002569 ASSERT(!VN_ISDIR(src_vp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002570
Linus Torvalds1da177e2005-04-16 15:20:36 -07002571 if (XFS_FORCED_SHUTDOWN(mp))
2572 return XFS_ERROR(EIO);
2573
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002574 if (DM_EVENT_ENABLED(tdp, DM_EVENT_LINK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002575 error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK,
2576 target_dir_vp, DM_RIGHT_NULL,
2577 src_vp, DM_RIGHT_NULL,
2578 target_name, NULL, 0, 0, 0);
2579 if (error)
2580 return error;
2581 }
2582
2583 /* Return through std_return after this point. */
2584
2585 error = XFS_QM_DQATTACH(mp, sip, 0);
2586 if (!error && sip != tdp)
2587 error = XFS_QM_DQATTACH(mp, tdp, 0);
2588 if (error)
2589 goto std_return;
2590
2591 tp = xfs_trans_alloc(mp, XFS_TRANS_LINK);
2592 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2593 resblks = XFS_LINK_SPACE_RES(mp, target_namelen);
2594 error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0,
2595 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2596 if (error == ENOSPC) {
2597 resblks = 0;
2598 error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0,
2599 XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT);
2600 }
2601 if (error) {
2602 cancel_flags = 0;
2603 goto error_return;
2604 }
2605
2606 if (sip->i_ino < tdp->i_ino) {
2607 ips[0] = sip;
2608 ips[1] = tdp;
2609 } else {
2610 ips[0] = tdp;
2611 ips[1] = sip;
2612 }
2613
2614 xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL);
2615
2616 /*
2617 * Increment vnode ref counts since xfs_trans_commit &
2618 * xfs_trans_cancel will both unlock the inodes and
2619 * decrement the associated ref counts.
2620 */
2621 VN_HOLD(src_vp);
2622 VN_HOLD(target_dir_vp);
2623 xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
2624 xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
2625
2626 /*
2627 * If the source has too many links, we can't make any more to it.
2628 */
2629 if (sip->i_d.di_nlink >= XFS_MAXLINK) {
2630 error = XFS_ERROR(EMLINK);
2631 goto error_return;
2632 }
2633
Nathan Scott365ca832005-06-21 15:39:12 +10002634 /*
2635 * If we are using project inheritance, we only allow hard link
2636 * creation in our tree when the project IDs are the same; else
2637 * the tree quota mechanism could be circumvented.
2638 */
2639 if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
2640 (tdp->i_d.di_projid != sip->i_d.di_projid))) {
Nathan Scottb1ecdda2006-05-08 19:51:42 +10002641 error = XFS_ERROR(EXDEV);
Nathan Scott365ca832005-06-21 15:39:12 +10002642 goto error_return;
2643 }
2644
Linus Torvalds1da177e2005-04-16 15:20:36 -07002645 if (resblks == 0 &&
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002646 (error = xfs_dir_canenter(tp, tdp, target_name, target_namelen)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647 goto error_return;
2648
2649 XFS_BMAP_INIT(&free_list, &first_block);
2650
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002651 error = xfs_dir_createname(tp, tdp, target_name, target_namelen,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652 sip->i_ino, &first_block, &free_list,
2653 resblks);
2654 if (error)
2655 goto abort_return;
2656 xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2657 tdp->i_gen++;
2658 xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE);
2659
2660 error = xfs_bumplink(tp, sip);
Alexey Dobriyanb71d3002006-06-27 12:45:17 +10002661 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 goto abort_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002663
2664 /*
2665 * If this is a synchronous mount, make sure that the
2666 * link transaction goes to disk before returning to
2667 * the user.
2668 */
2669 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2670 xfs_trans_set_sync(tp);
2671 }
2672
Eric Sandeenf7c99b62007-02-10 18:37:16 +11002673 error = xfs_bmap_finish (&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 if (error) {
2675 xfs_bmap_cancel(&free_list);
2676 goto abort_return;
2677 }
2678
Eric Sandeen1c72bf92007-05-08 13:48:42 +10002679 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Alexey Dobriyanb71d3002006-06-27 12:45:17 +10002680 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681 goto std_return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682
2683 /* Fall through to std_return with error = 0. */
2684std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002685 if (DM_EVENT_ENABLED(sip, DM_EVENT_POSTLINK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK,
2687 target_dir_vp, DM_RIGHT_NULL,
2688 src_vp, DM_RIGHT_NULL,
2689 target_name, NULL, 0, error, 0);
2690 }
2691 return error;
2692
2693 abort_return:
2694 cancel_flags |= XFS_TRANS_ABORT;
2695 /* FALLTHROUGH */
Jesper Juhl014c2542006-01-15 02:37:08 +01002696
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 error_return:
2698 xfs_trans_cancel(tp, cancel_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 goto std_return;
2700}
Alexey Dobriyanb71d3002006-06-27 12:45:17 +10002701
2702
Christoph Hellwig993386c2007-08-28 16:12:30 +10002703int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704xfs_mkdir(
Christoph Hellwig993386c2007-08-28 16:12:30 +10002705 xfs_inode_t *dp,
Nathan Scott8285fb52006-06-09 17:07:12 +10002706 bhv_vname_t *dentry,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10002707 mode_t mode,
Nathan Scott67fcaa72006-06-09 17:00:52 +10002708 bhv_vnode_t **vpp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 cred_t *credp)
2710{
Christoph Hellwig993386c2007-08-28 16:12:30 +10002711 bhv_vnode_t *dir_vp = XFS_ITOV(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712 char *dir_name = VNAME(dentry);
Christoph Hellwig993386c2007-08-28 16:12:30 +10002713 int dir_namelen = VNAMELEN(dentry);
2714 xfs_mount_t *mp = dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715 xfs_inode_t *cdp; /* inode of created dir */
Nathan Scott67fcaa72006-06-09 17:00:52 +10002716 bhv_vnode_t *cvp; /* vnode of created dir */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718 int cancel_flags;
2719 int error;
2720 int committed;
2721 xfs_bmap_free_t free_list;
2722 xfs_fsblock_t first_block;
Christoph Hellwig993386c2007-08-28 16:12:30 +10002723 boolean_t unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724 boolean_t created = B_FALSE;
2725 int dm_event_sent = 0;
2726 xfs_prid_t prid;
2727 struct xfs_dquot *udqp, *gdqp;
2728 uint resblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002729
2730 if (XFS_FORCED_SHUTDOWN(mp))
2731 return XFS_ERROR(EIO);
2732
Linus Torvalds1da177e2005-04-16 15:20:36 -07002733 tp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002735 if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736 error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE,
2737 dir_vp, DM_RIGHT_NULL, NULL,
2738 DM_RIGHT_NULL, dir_name, NULL,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10002739 mode, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002740 if (error)
2741 return error;
2742 dm_event_sent = 1;
2743 }
2744
2745 /* Return through std_return after this point. */
2746
Christoph Hellwig1543d792007-08-29 11:46:47 +10002747 vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002748
2749 mp = dp->i_mount;
2750 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10002751 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
2752 prid = dp->i_d.di_projid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002753 else
2754 prid = (xfs_prid_t)dfltprid;
2755
2756 /*
2757 * Make sure that we have allocated dquot(s) on disk.
2758 */
2759 error = XFS_QM_DQVOPALLOC(mp, dp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002760 current_fsuid(credp), current_fsgid(credp), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002761 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
2762 if (error)
2763 goto std_return;
2764
2765 tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR);
2766 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2767 resblks = XFS_MKDIR_SPACE_RES(mp, dir_namelen);
2768 error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0,
2769 XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT);
2770 if (error == ENOSPC) {
2771 resblks = 0;
2772 error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0,
2773 XFS_TRANS_PERM_LOG_RES,
2774 XFS_MKDIR_LOG_COUNT);
2775 }
2776 if (error) {
2777 cancel_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002778 goto error_return;
2779 }
2780
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10002781 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
Christoph Hellwig993386c2007-08-28 16:12:30 +10002782 unlock_dp_on_error = B_TRUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002783
2784 /*
2785 * Check for directory link count overflow.
2786 */
2787 if (dp->i_d.di_nlink >= XFS_MAXLINK) {
2788 error = XFS_ERROR(EMLINK);
2789 goto error_return;
2790 }
2791
2792 /*
2793 * Reserve disk quota and the inode.
2794 */
2795 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
2796 if (error)
2797 goto error_return;
2798
2799 if (resblks == 0 &&
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002800 (error = xfs_dir_canenter(tp, dp, dir_name, dir_namelen)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801 goto error_return;
2802 /*
2803 * create the directory inode.
2804 */
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10002805 error = xfs_dir_ialloc(&tp, dp, mode, 2,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002806 0, credp, prid, resblks > 0,
2807 &cdp, NULL);
2808 if (error) {
2809 if (error == ENOSPC)
2810 goto error_return;
2811 goto abort_return;
2812 }
2813 ITRACE(cdp);
2814
2815 /*
2816 * Now we add the directory inode to the transaction.
2817 * We waited until now since xfs_dir_ialloc might start
2818 * a new transaction. Had we joined the transaction
Christoph Hellwig993386c2007-08-28 16:12:30 +10002819 * earlier, the locks might have gotten released. An error
2820 * from here on will result in the transaction cancel
2821 * unlocking dp so don't do it explicitly in the error path.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002822 */
2823 VN_HOLD(dir_vp);
2824 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
Christoph Hellwig993386c2007-08-28 16:12:30 +10002825 unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826
2827 XFS_BMAP_INIT(&free_list, &first_block);
2828
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002829 error = xfs_dir_createname(tp, dp, dir_name, dir_namelen, cdp->i_ino,
2830 &first_block, &free_list, resblks ?
2831 resblks - XFS_IALLOC_SPACE_RES(mp) : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832 if (error) {
2833 ASSERT(error != ENOSPC);
2834 goto error1;
2835 }
2836 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
2837
2838 /*
2839 * Bump the in memory version number of the parent directory
2840 * so that other processes accessing it will recognize that
2841 * the directory has changed.
2842 */
2843 dp->i_gen++;
2844
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002845 error = xfs_dir_init(tp, cdp, dp);
2846 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847 goto error2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002848
2849 cdp->i_gen = 1;
2850 error = xfs_bumplink(tp, dp);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10002851 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002852 goto error2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002853
2854 cvp = XFS_ITOV(cdp);
2855
2856 created = B_TRUE;
2857
2858 *vpp = cvp;
2859 IHOLD(cdp);
2860
2861 /*
2862 * Attach the dquots to the new inode and modify the icount incore.
2863 */
2864 XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp);
2865
2866 /*
2867 * If this is a synchronous mount, make sure that the
2868 * mkdir transaction goes to disk before returning to
2869 * the user.
2870 */
2871 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
2872 xfs_trans_set_sync(tp);
2873 }
2874
Eric Sandeenf7c99b62007-02-10 18:37:16 +11002875 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876 if (error) {
2877 IRELE(cdp);
2878 goto error2;
2879 }
2880
Eric Sandeen1c72bf92007-05-08 13:48:42 +10002881 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882 XFS_QM_DQRELE(mp, udqp);
2883 XFS_QM_DQRELE(mp, gdqp);
2884 if (error) {
2885 IRELE(cdp);
2886 }
2887
2888 /* Fall through to std_return with error = 0 or errno from
2889 * xfs_trans_commit. */
2890
2891std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002892 if ((created || (error != 0 && dm_event_sent != 0)) &&
Christoph Hellwig993386c2007-08-28 16:12:30 +10002893 DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE,
2895 dir_vp, DM_RIGHT_NULL,
2896 created ? XFS_ITOV(cdp):NULL,
2897 DM_RIGHT_NULL,
2898 dir_name, NULL,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10002899 mode, error, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 }
2901 return error;
2902
2903 error2:
2904 error1:
2905 xfs_bmap_cancel(&free_list);
2906 abort_return:
2907 cancel_flags |= XFS_TRANS_ABORT;
2908 error_return:
2909 xfs_trans_cancel(tp, cancel_flags);
2910 XFS_QM_DQRELE(mp, udqp);
2911 XFS_QM_DQRELE(mp, gdqp);
2912
Christoph Hellwig993386c2007-08-28 16:12:30 +10002913 if (unlock_dp_on_error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002914 xfs_iunlock(dp, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002915
2916 goto std_return;
2917}
2918
Christoph Hellwig993386c2007-08-28 16:12:30 +10002919int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002920xfs_rmdir(
Christoph Hellwig993386c2007-08-28 16:12:30 +10002921 xfs_inode_t *dp,
2922 bhv_vname_t *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923{
Christoph Hellwig993386c2007-08-28 16:12:30 +10002924 bhv_vnode_t *dir_vp = XFS_ITOV(dp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002925 char *name = VNAME(dentry);
Christoph Hellwig993386c2007-08-28 16:12:30 +10002926 int namelen = VNAMELEN(dentry);
2927 xfs_mount_t *mp = dp->i_mount;
2928 xfs_inode_t *cdp; /* child directory */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002930 int error;
2931 xfs_bmap_free_t free_list;
2932 xfs_fsblock_t first_block;
2933 int cancel_flags;
2934 int committed;
Vlad Apostolov17370092006-09-28 11:02:30 +10002935 int dm_di_mode = S_IFDIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002936 int last_cdp_link;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937 uint resblks;
2938
Christoph Hellwig1543d792007-08-29 11:46:47 +10002939 vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940
Christoph Hellwig993386c2007-08-28 16:12:30 +10002941 if (XFS_FORCED_SHUTDOWN(mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 return XFS_ERROR(EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002943
Vlad Apostolov17370092006-09-28 11:02:30 +10002944 if (!xfs_get_dir_entry(dentry, &cdp)) {
2945 dm_di_mode = cdp->i_d.di_mode;
2946 IRELE(cdp);
2947 }
2948
Christoph Hellwigeb9df392007-08-16 18:42:07 +10002949 if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002950 error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE,
2951 dir_vp, DM_RIGHT_NULL,
2952 NULL, DM_RIGHT_NULL,
Vlad Apostolov17370092006-09-28 11:02:30 +10002953 name, NULL, dm_di_mode, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002954 if (error)
2955 return XFS_ERROR(error);
2956 }
2957
2958 /* Return through std_return after this point. */
2959
2960 cdp = NULL;
2961
2962 /*
2963 * We need to get a reference to cdp before we get our log
2964 * reservation. The reason for this is that we cannot call
2965 * xfs_iget for an inode for which we do not have a reference
2966 * once we've acquired a log reservation. This is because the
2967 * inode we are trying to get might be in xfs_inactive going
2968 * for a log reservation. Since we'll have to wait for the
2969 * inactive code to complete before returning from xfs_iget,
2970 * we need to make sure that we don't have log space reserved
Nathan Scottc41564b2006-03-29 08:55:14 +10002971 * when we call xfs_iget. Instead we get an unlocked reference
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972 * to the inode before getting our log reservation.
2973 */
2974 error = xfs_get_dir_entry(dentry, &cdp);
2975 if (error) {
2976 REMOVE_DEBUG_TRACE(__LINE__);
2977 goto std_return;
2978 }
2979 mp = dp->i_mount;
2980 dm_di_mode = cdp->i_d.di_mode;
2981
2982 /*
2983 * Get the dquots for the inodes.
2984 */
2985 error = XFS_QM_DQATTACH(mp, dp, 0);
2986 if (!error && dp != cdp)
2987 error = XFS_QM_DQATTACH(mp, cdp, 0);
2988 if (error) {
2989 IRELE(cdp);
2990 REMOVE_DEBUG_TRACE(__LINE__);
2991 goto std_return;
2992 }
2993
2994 tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR);
2995 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
2996 /*
2997 * We try to get the real space reservation first,
2998 * allowing for directory btree deletion(s) implying
2999 * possible bmap insert(s). If we can't get the space
3000 * reservation then we use 0 instead, and avoid the bmap
3001 * btree insert(s) in the directory code by, if the bmap
3002 * insert tries to happen, instead trimming the LAST
3003 * block from the directory.
3004 */
3005 resblks = XFS_REMOVE_SPACE_RES(mp);
3006 error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0,
3007 XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT);
3008 if (error == ENOSPC) {
3009 resblks = 0;
3010 error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0,
3011 XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT);
3012 }
3013 if (error) {
3014 ASSERT(error != ENOSPC);
3015 cancel_flags = 0;
3016 IRELE(cdp);
3017 goto error_return;
3018 }
3019 XFS_BMAP_INIT(&free_list, &first_block);
3020
3021 /*
3022 * Now lock the child directory inode and the parent directory
3023 * inode in the proper order. This will take care of validating
3024 * that the directory entry for the child directory inode has
3025 * not changed while we were obtaining a log reservation.
3026 */
Eric Sandeene9ed9d22007-05-08 13:48:56 +10003027 error = xfs_lock_dir_and_entry(dp, cdp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003028 if (error) {
3029 xfs_trans_cancel(tp, cancel_flags);
3030 IRELE(cdp);
3031 goto std_return;
3032 }
3033
3034 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
3035 if (dp != cdp) {
3036 /*
3037 * Only increment the parent directory vnode count if
3038 * we didn't bump it in looking up cdp. The only time
3039 * we don't bump it is when we're looking up ".".
3040 */
3041 VN_HOLD(dir_vp);
3042 }
3043
3044 ITRACE(cdp);
3045 xfs_trans_ijoin(tp, cdp, XFS_ILOCK_EXCL);
3046
3047 ASSERT(cdp->i_d.di_nlink >= 2);
3048 if (cdp->i_d.di_nlink != 2) {
3049 error = XFS_ERROR(ENOTEMPTY);
3050 goto error_return;
3051 }
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10003052 if (!xfs_dir_isempty(cdp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 error = XFS_ERROR(ENOTEMPTY);
3054 goto error_return;
3055 }
3056
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10003057 error = xfs_dir_removename(tp, dp, name, namelen, cdp->i_ino,
3058 &first_block, &free_list, resblks);
3059 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003060 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003061
3062 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3063
3064 /*
3065 * Bump the in memory generation count on the parent
3066 * directory so that other can know that it has changed.
3067 */
3068 dp->i_gen++;
3069
3070 /*
3071 * Drop the link from cdp's "..".
3072 */
3073 error = xfs_droplink(tp, dp);
3074 if (error) {
3075 goto error1;
3076 }
3077
3078 /*
3079 * Drop the link from dp to cdp.
3080 */
3081 error = xfs_droplink(tp, cdp);
3082 if (error) {
3083 goto error1;
3084 }
3085
3086 /*
3087 * Drop the "." link from cdp to self.
3088 */
3089 error = xfs_droplink(tp, cdp);
3090 if (error) {
3091 goto error1;
3092 }
3093
3094 /* Determine these before committing transaction */
3095 last_cdp_link = (cdp)->i_d.di_nlink==0;
3096
3097 /*
3098 * Take an extra ref on the child vnode so that it
3099 * does not go to xfs_inactive() from within the commit.
3100 */
3101 IHOLD(cdp);
3102
3103 /*
3104 * If this is a synchronous mount, make sure that the
3105 * rmdir transaction goes to disk before returning to
3106 * the user.
3107 */
3108 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
3109 xfs_trans_set_sync(tp);
3110 }
3111
Eric Sandeenf7c99b62007-02-10 18:37:16 +11003112 error = xfs_bmap_finish (&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003113 if (error) {
3114 xfs_bmap_cancel(&free_list);
3115 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES |
3116 XFS_TRANS_ABORT));
3117 IRELE(cdp);
3118 goto std_return;
3119 }
3120
Eric Sandeen1c72bf92007-05-08 13:48:42 +10003121 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003122 if (error) {
3123 IRELE(cdp);
3124 goto std_return;
3125 }
3126
3127
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128 IRELE(cdp);
3129
3130 /* Fall through to std_return with error = 0 or the errno
3131 * from xfs_trans_commit. */
Nathan Scottbb19fba2006-03-22 14:12:12 +11003132 std_return:
Christoph Hellwigeb9df392007-08-16 18:42:07 +10003133 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003134 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE,
3135 dir_vp, DM_RIGHT_NULL,
3136 NULL, DM_RIGHT_NULL,
3137 name, NULL, dm_di_mode,
3138 error, 0);
3139 }
3140 return error;
3141
Nathan Scottbb19fba2006-03-22 14:12:12 +11003142 error1:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143 xfs_bmap_cancel(&free_list);
3144 cancel_flags |= XFS_TRANS_ABORT;
Jesper Juhl014c2542006-01-15 02:37:08 +01003145 /* FALLTHROUGH */
3146
Nathan Scottbb19fba2006-03-22 14:12:12 +11003147 error_return:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003148 xfs_trans_cancel(tp, cancel_flags);
3149 goto std_return;
3150}
3151
Christoph Hellwig993386c2007-08-28 16:12:30 +10003152int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003153xfs_symlink(
Christoph Hellwig993386c2007-08-28 16:12:30 +10003154 xfs_inode_t *dp,
Nathan Scott8285fb52006-06-09 17:07:12 +10003155 bhv_vname_t *dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003156 char *target_path,
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10003157 mode_t mode,
Nathan Scott67fcaa72006-06-09 17:00:52 +10003158 bhv_vnode_t **vpp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003159 cred_t *credp)
3160{
Christoph Hellwig993386c2007-08-28 16:12:30 +10003161 bhv_vnode_t *dir_vp = XFS_ITOV(dp);
3162 xfs_mount_t *mp = dp->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003163 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003164 xfs_inode_t *ip;
3165 int error;
3166 int pathlen;
3167 xfs_bmap_free_t free_list;
3168 xfs_fsblock_t first_block;
Christoph Hellwig993386c2007-08-28 16:12:30 +10003169 boolean_t unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003170 uint cancel_flags;
3171 int committed;
3172 xfs_fileoff_t first_fsb;
3173 xfs_filblks_t fs_blocks;
3174 int nmaps;
3175 xfs_bmbt_irec_t mval[SYMLINK_MAPS];
3176 xfs_daddr_t d;
3177 char *cur_chunk;
3178 int byte_cnt;
3179 int n;
3180 xfs_buf_t *bp;
3181 xfs_prid_t prid;
3182 struct xfs_dquot *udqp, *gdqp;
3183 uint resblks;
3184 char *link_name = VNAME(dentry);
3185 int link_namelen;
3186
3187 *vpp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003188 error = 0;
3189 ip = NULL;
3190 tp = NULL;
3191
Christoph Hellwig1543d792007-08-29 11:46:47 +10003192 vn_trace_entry(dp, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003193
Linus Torvalds1da177e2005-04-16 15:20:36 -07003194
3195 if (XFS_FORCED_SHUTDOWN(mp))
3196 return XFS_ERROR(EIO);
3197
3198 link_namelen = VNAMELEN(dentry);
3199
3200 /*
3201 * Check component lengths of the target path name.
3202 */
3203 pathlen = strlen(target_path);
3204 if (pathlen >= MAXPATHLEN) /* total string too long */
3205 return XFS_ERROR(ENAMETOOLONG);
3206 if (pathlen >= MAXNAMELEN) { /* is any component too long? */
3207 int len, total;
3208 char *path;
3209
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10003210 for (total = 0, path = target_path; total < pathlen;) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003211 /*
3212 * Skip any slashes.
3213 */
3214 while(*path == '/') {
3215 total++;
3216 path++;
3217 }
3218
3219 /*
3220 * Count up to the next slash or end of path.
3221 * Error out if the component is bigger than MAXNAMELEN.
3222 */
3223 for(len = 0; *path != '/' && total < pathlen;total++, path++) {
3224 if (++len >= MAXNAMELEN) {
3225 error = ENAMETOOLONG;
3226 return error;
3227 }
3228 }
3229 }
3230 }
3231
Christoph Hellwigeb9df392007-08-16 18:42:07 +10003232 if (DM_EVENT_ENABLED(dp, DM_EVENT_SYMLINK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003233 error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dir_vp,
3234 DM_RIGHT_NULL, NULL, DM_RIGHT_NULL,
3235 link_name, target_path, 0, 0, 0);
3236 if (error)
3237 return error;
3238 }
3239
3240 /* Return through std_return after this point. */
3241
3242 udqp = gdqp = NULL;
Nathan Scott365ca832005-06-21 15:39:12 +10003243 if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
3244 prid = dp->i_d.di_projid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003245 else
3246 prid = (xfs_prid_t)dfltprid;
3247
3248 /*
3249 * Make sure that we have allocated dquot(s) on disk.
3250 */
3251 error = XFS_QM_DQVOPALLOC(mp, dp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10003252 current_fsuid(credp), current_fsgid(credp), prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003253 XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
3254 if (error)
3255 goto std_return;
3256
3257 tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
3258 cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
3259 /*
3260 * The symlink will fit into the inode data fork?
3261 * There can't be any attributes so we get the whole variable part.
3262 */
3263 if (pathlen <= XFS_LITINO(mp))
3264 fs_blocks = 0;
3265 else
3266 fs_blocks = XFS_B_TO_FSB(mp, pathlen);
3267 resblks = XFS_SYMLINK_SPACE_RES(mp, link_namelen, fs_blocks);
3268 error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
3269 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
3270 if (error == ENOSPC && fs_blocks == 0) {
3271 resblks = 0;
3272 error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
3273 XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
3274 }
3275 if (error) {
3276 cancel_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003277 goto error_return;
3278 }
3279
Lachlan McIlroyf7c66ce2007-05-08 13:50:19 +10003280 xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
Christoph Hellwig993386c2007-08-28 16:12:30 +10003281 unlock_dp_on_error = B_TRUE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003282
3283 /*
3284 * Check whether the directory allows new symlinks or not.
3285 */
3286 if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
3287 error = XFS_ERROR(EPERM);
3288 goto error_return;
3289 }
3290
3291 /*
3292 * Reserve disk quota : blocks and inode.
3293 */
3294 error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0);
3295 if (error)
3296 goto error_return;
3297
3298 /*
3299 * Check for ability to enter directory entry, if no space reserved.
3300 */
3301 if (resblks == 0 &&
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10003302 (error = xfs_dir_canenter(tp, dp, link_name, link_namelen)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003303 goto error_return;
3304 /*
3305 * Initialize the bmap freelist prior to calling either
3306 * bmapi or the directory create code.
3307 */
3308 XFS_BMAP_INIT(&free_list, &first_block);
3309
3310 /*
3311 * Allocate an inode for the symlink.
3312 */
Christoph Hellwig3e5daf02007-10-11 18:09:12 +10003313 error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT),
Linus Torvalds1da177e2005-04-16 15:20:36 -07003314 1, 0, credp, prid, resblks > 0, &ip, NULL);
3315 if (error) {
3316 if (error == ENOSPC)
3317 goto error_return;
3318 goto error1;
3319 }
3320 ITRACE(ip);
3321
Christoph Hellwig993386c2007-08-28 16:12:30 +10003322 /*
3323 * An error after we've joined dp to the transaction will result in the
3324 * transaction cancel unlocking dp so don't do it explicitly in the
3325 * error path.
3326 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003327 VN_HOLD(dir_vp);
3328 xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
Christoph Hellwig993386c2007-08-28 16:12:30 +10003329 unlock_dp_on_error = B_FALSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003330
3331 /*
3332 * Also attach the dquot(s) to it, if applicable.
3333 */
3334 XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp);
3335
3336 if (resblks)
3337 resblks -= XFS_IALLOC_SPACE_RES(mp);
3338 /*
3339 * If the symlink will fit into the inode, write it inline.
3340 */
3341 if (pathlen <= XFS_IFORK_DSIZE(ip)) {
3342 xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
3343 memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
3344 ip->i_d.di_size = pathlen;
3345
3346 /*
3347 * The inode was initially created in extent format.
3348 */
3349 ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
3350 ip->i_df.if_flags |= XFS_IFINLINE;
3351
3352 ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
3353 xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
3354
3355 } else {
3356 first_fsb = 0;
3357 nmaps = SYMLINK_MAPS;
3358
3359 error = xfs_bmapi(tp, ip, first_fsb, fs_blocks,
3360 XFS_BMAPI_WRITE | XFS_BMAPI_METADATA,
3361 &first_block, resblks, mval, &nmaps,
Olaf Weber3e57ecf2006-06-09 14:48:12 +10003362 &free_list, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003363 if (error) {
3364 goto error1;
3365 }
3366
3367 if (resblks)
3368 resblks -= fs_blocks;
3369 ip->i_d.di_size = pathlen;
3370 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3371
3372 cur_chunk = target_path;
3373 for (n = 0; n < nmaps; n++) {
3374 d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
3375 byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
3376 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
3377 BTOBB(byte_cnt), 0);
3378 ASSERT(bp && !XFS_BUF_GETERROR(bp));
3379 if (pathlen < byte_cnt) {
3380 byte_cnt = pathlen;
3381 }
3382 pathlen -= byte_cnt;
3383
3384 memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt);
3385 cur_chunk += byte_cnt;
3386
3387 xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
3388 }
3389 }
3390
3391 /*
3392 * Create the directory entry for the symlink.
3393 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +10003394 error = xfs_dir_createname(tp, dp, link_name, link_namelen, ip->i_ino,
3395 &first_block, &free_list, resblks);
3396 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003397 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003398 xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
3399 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
3400
3401 /*
3402 * Bump the in memory version number of the parent directory
3403 * so that other processes accessing it will recognize that
3404 * the directory has changed.
3405 */
3406 dp->i_gen++;
3407
3408 /*
3409 * If this is a synchronous mount, make sure that the
3410 * symlink transaction goes to disk before returning to
3411 * the user.
3412 */
3413 if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
3414 xfs_trans_set_sync(tp);
3415 }
3416
3417 /*
3418 * xfs_trans_commit normally decrements the vnode ref count
3419 * when it unlocks the inode. Since we want to return the
3420 * vnode to the caller, we bump the vnode ref count now.
3421 */
3422 IHOLD(ip);
3423
Eric Sandeenf7c99b62007-02-10 18:37:16 +11003424 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 if (error) {
3426 goto error2;
3427 }
Eric Sandeen1c72bf92007-05-08 13:48:42 +10003428 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003429 XFS_QM_DQRELE(mp, udqp);
3430 XFS_QM_DQRELE(mp, gdqp);
3431
3432 /* Fall through to std_return with error = 0 or errno from
3433 * xfs_trans_commit */
3434std_return:
Christoph Hellwig993386c2007-08-28 16:12:30 +10003435 if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTSYMLINK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003436 (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK,
3437 dir_vp, DM_RIGHT_NULL,
3438 error ? NULL : XFS_ITOV(ip),
3439 DM_RIGHT_NULL, link_name, target_path,
3440 0, error, 0);
3441 }
3442
3443 if (!error) {
Nathan Scott67fcaa72006-06-09 17:00:52 +10003444 bhv_vnode_t *vp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003445
3446 ASSERT(ip);
3447 vp = XFS_ITOV(ip);
3448 *vpp = vp;
3449 }
3450 return error;
3451
3452 error2:
3453 IRELE(ip);
3454 error1:
3455 xfs_bmap_cancel(&free_list);
3456 cancel_flags |= XFS_TRANS_ABORT;
3457 error_return:
3458 xfs_trans_cancel(tp, cancel_flags);
3459 XFS_QM_DQRELE(mp, udqp);
3460 XFS_QM_DQRELE(mp, gdqp);
3461
Christoph Hellwig993386c2007-08-28 16:12:30 +10003462 if (unlock_dp_on_error)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003463 xfs_iunlock(dp, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003464
3465 goto std_return;
3466}
3467
3468
Christoph Hellwig993386c2007-08-28 16:12:30 +10003469int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003470xfs_fid2(
Christoph Hellwig993386c2007-08-28 16:12:30 +10003471 xfs_inode_t *ip,
Christoph Hellwigc6143912007-09-14 15:22:37 +10003472 xfs_fid_t *xfid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003473{
Christoph Hellwig1543d792007-08-29 11:46:47 +10003474 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003475
Christoph Hellwigc6143912007-09-14 15:22:37 +10003476 xfid->fid_len = sizeof(xfs_fid_t) - sizeof(xfid->fid_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003477 xfid->fid_pad = 0;
3478 /*
3479 * use memcpy because the inode is a long long and there's no
3480 * assurance that xfid->fid_ino is properly aligned.
3481 */
3482 memcpy(&xfid->fid_ino, &ip->i_ino, sizeof(xfid->fid_ino));
3483 xfid->fid_gen = ip->i_d.di_gen;
3484
3485 return 0;
3486}
3487
3488
Linus Torvalds1da177e2005-04-16 15:20:36 -07003489int
3490xfs_rwlock(
Christoph Hellwig993386c2007-08-28 16:12:30 +10003491 xfs_inode_t *ip,
Nathan Scott8285fb52006-06-09 17:07:12 +10003492 bhv_vrwlock_t locktype)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003493{
Christoph Hellwig993386c2007-08-28 16:12:30 +10003494 if (S_ISDIR(ip->i_d.di_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003495 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003496 if (locktype == VRWLOCK_WRITE) {
3497 xfs_ilock(ip, XFS_IOLOCK_EXCL);
3498 } else if (locktype == VRWLOCK_TRY_READ) {
Jesper Juhl014c2542006-01-15 02:37:08 +01003499 return xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003500 } else if (locktype == VRWLOCK_TRY_WRITE) {
Jesper Juhl014c2542006-01-15 02:37:08 +01003501 return xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003502 } else {
3503 ASSERT((locktype == VRWLOCK_READ) ||
3504 (locktype == VRWLOCK_WRITE_DIRECT));
3505 xfs_ilock(ip, XFS_IOLOCK_SHARED);
3506 }
3507
3508 return 1;
3509}
3510
3511
Linus Torvalds1da177e2005-04-16 15:20:36 -07003512void
3513xfs_rwunlock(
Christoph Hellwig993386c2007-08-28 16:12:30 +10003514 xfs_inode_t *ip,
Nathan Scott8285fb52006-06-09 17:07:12 +10003515 bhv_vrwlock_t locktype)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003516{
Christoph Hellwig993386c2007-08-28 16:12:30 +10003517 if (S_ISDIR(ip->i_d.di_mode))
3518 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003519 if (locktype == VRWLOCK_WRITE) {
3520 /*
3521 * In the write case, we may have added a new entry to
3522 * the reference cache. This might store a pointer to
3523 * an inode to be released in this inode. If it is there,
3524 * clear the pointer and release the inode after unlocking
3525 * this one.
3526 */
3527 xfs_refcache_iunlock(ip, XFS_IOLOCK_EXCL);
3528 } else {
3529 ASSERT((locktype == VRWLOCK_READ) ||
3530 (locktype == VRWLOCK_WRITE_DIRECT));
3531 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
3532 }
3533 return;
3534}
3535
Christoph Hellwig993386c2007-08-28 16:12:30 +10003536
3537int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003538xfs_inode_flush(
Christoph Hellwig993386c2007-08-28 16:12:30 +10003539 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003540 int flags)
3541{
Christoph Hellwig993386c2007-08-28 16:12:30 +10003542 xfs_mount_t *mp = ip->i_mount;
3543 xfs_inode_log_item_t *iip = ip->i_itemp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003544 int error = 0;
3545
Linus Torvalds1da177e2005-04-16 15:20:36 -07003546 if (XFS_FORCED_SHUTDOWN(mp))
3547 return XFS_ERROR(EIO);
3548
3549 /*
3550 * Bypass inodes which have already been cleaned by
3551 * the inode flush clustering code inside xfs_iflush
3552 */
3553 if ((ip->i_update_core == 0) &&
3554 ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL)))
3555 return 0;
3556
3557 if (flags & FLUSH_LOG) {
3558 if (iip && iip->ili_last_lsn) {
3559 xlog_t *log = mp->m_log;
3560 xfs_lsn_t sync_lsn;
3561 int s, log_flags = XFS_LOG_FORCE;
3562
3563 s = GRANT_LOCK(log);
3564 sync_lsn = log->l_last_sync_lsn;
3565 GRANT_UNLOCK(log, s);
3566
Lachlan McIlroy776a75f2007-09-14 15:22:50 +10003567 if ((XFS_LSN_CMP(iip->ili_last_lsn, sync_lsn) > 0)) {
3568 if (flags & FLUSH_SYNC)
3569 log_flags |= XFS_LOG_SYNC;
3570 error = xfs_log_force(mp, iip->ili_last_lsn, log_flags);
3571 if (error)
3572 return error;
3573 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003574
Lachlan McIlroy776a75f2007-09-14 15:22:50 +10003575 if (ip->i_update_core == 0)
3576 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003577 }
3578 }
3579
3580 /*
3581 * We make this non-blocking if the inode is contended,
3582 * return EAGAIN to indicate to the caller that they
3583 * did not succeed. This prevents the flush path from
3584 * blocking on inodes inside another operation right
3585 * now, they get caught later by xfs_sync.
3586 */
3587 if (flags & FLUSH_INODE) {
3588 int flush_flags;
3589
Linus Torvalds1da177e2005-04-16 15:20:36 -07003590 if (flags & FLUSH_SYNC) {
3591 xfs_ilock(ip, XFS_ILOCK_SHARED);
3592 xfs_iflock(ip);
3593 } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
3594 if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) {
3595 xfs_iunlock(ip, XFS_ILOCK_SHARED);
3596 return EAGAIN;
3597 }
3598 } else {
3599 return EAGAIN;
3600 }
3601
3602 if (flags & FLUSH_SYNC)
3603 flush_flags = XFS_IFLUSH_SYNC;
3604 else
3605 flush_flags = XFS_IFLUSH_ASYNC;
3606
3607 error = xfs_iflush(ip, flush_flags);
3608 xfs_iunlock(ip, XFS_ILOCK_SHARED);
3609 }
3610
3611 return error;
3612}
3613
Christoph Hellwig993386c2007-08-28 16:12:30 +10003614
Linus Torvalds1da177e2005-04-16 15:20:36 -07003615int
Christoph Hellwig993386c2007-08-28 16:12:30 +10003616xfs_set_dmattrs(
3617 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003618 u_int evmask,
Christoph Hellwig993386c2007-08-28 16:12:30 +10003619 u_int16_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003620{
Christoph Hellwig993386c2007-08-28 16:12:30 +10003621 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003622 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003623 int error;
3624
3625 if (!capable(CAP_SYS_ADMIN))
3626 return XFS_ERROR(EPERM);
3627
Linus Torvalds1da177e2005-04-16 15:20:36 -07003628 if (XFS_FORCED_SHUTDOWN(mp))
3629 return XFS_ERROR(EIO);
3630
3631 tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS);
3632 error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0);
3633 if (error) {
3634 xfs_trans_cancel(tp, 0);
3635 return error;
3636 }
3637 xfs_ilock(ip, XFS_ILOCK_EXCL);
3638 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3639
3640 ip->i_iocore.io_dmevmask = ip->i_d.di_dmevmask = evmask;
3641 ip->i_iocore.io_dmstate = ip->i_d.di_dmstate = state;
3642
3643 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
3644 IHOLD(ip);
Eric Sandeen1c72bf92007-05-08 13:48:42 +10003645 error = xfs_trans_commit(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003646
3647 return error;
3648}
3649
Christoph Hellwig993386c2007-08-28 16:12:30 +10003650int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651xfs_reclaim(
Christoph Hellwig993386c2007-08-28 16:12:30 +10003652 xfs_inode_t *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003653{
Christoph Hellwig993386c2007-08-28 16:12:30 +10003654 bhv_vnode_t *vp = XFS_ITOV(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003655
Christoph Hellwig1543d792007-08-29 11:46:47 +10003656 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003657
3658 ASSERT(!VN_MAPPED(vp));
3659
3660 /* bad inode, get out here ASAP */
3661 if (VN_BAD(vp)) {
3662 xfs_ireclaim(ip);
3663 return 0;
3664 }
3665
Christoph Hellwigb677c212007-08-29 11:46:28 +10003666 vn_iowait(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003667
Christoph Hellwig51c91ed2005-09-02 16:58:38 +10003668 ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003669
Christoph Hellwig42fe2b12006-01-11 15:35:17 +11003670 /*
3671 * Make sure the atime in the XFS inode is correct before freeing the
3672 * Linux inode.
3673 */
3674 xfs_synchronize_atime(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003675
David Chinner4c606582006-11-11 18:05:00 +11003676 /*
3677 * If we have nothing to flush with this inode then complete the
3678 * teardown now, otherwise break the link between the xfs inode and the
3679 * linux inode and clean up the xfs inode later. This avoids flushing
3680 * the inode to disk during the delete operation itself.
3681 *
3682 * When breaking the link, we need to set the XFS_IRECLAIMABLE flag
3683 * first to ensure that xfs_iunpin() will never see an xfs inode
3684 * that has a linux inode being reclaimed. Synchronisation is provided
3685 * by the i_flags_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003686 */
3687 if (!ip->i_update_core && (ip->i_itemp == NULL)) {
3688 xfs_ilock(ip, XFS_ILOCK_EXCL);
3689 xfs_iflock(ip);
3690 return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC);
3691 } else {
3692 xfs_mount_t *mp = ip->i_mount;
3693
David Chinner4c606582006-11-11 18:05:00 +11003694 /* Protect sync and unpin from us */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003695 XFS_MOUNT_ILOCK(mp);
David Chinner4c606582006-11-11 18:05:00 +11003696 spin_lock(&ip->i_flags_lock);
3697 __xfs_iflags_set(ip, XFS_IRECLAIMABLE);
Christoph Hellwig739bfb22007-08-29 10:58:01 +10003698 vn_to_inode(vp)->i_private = NULL;
3699 ip->i_vnode = NULL;
David Chinner4c606582006-11-11 18:05:00 +11003700 spin_unlock(&ip->i_flags_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003701 list_add_tail(&ip->i_reclaim, &mp->m_del_inodes);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003702 XFS_MOUNT_IUNLOCK(mp);
3703 }
3704 return 0;
3705}
3706
3707int
3708xfs_finish_reclaim(
3709 xfs_inode_t *ip,
3710 int locked,
3711 int sync_mode)
3712{
David Chinnerda353b02007-08-28 14:00:13 +10003713 xfs_perag_t *pag = xfs_get_perag(ip->i_mount, ip->i_ino);
Nathan Scott67fcaa72006-06-09 17:00:52 +10003714 bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003715 int error;
3716
3717 if (vp && VN_BAD(vp))
3718 goto reclaim;
3719
3720 /* The hash lock here protects a thread in xfs_iget_core from
3721 * racing with us on linking the inode back with a vnode.
3722 * Once we have the XFS_IRECLAIM flag set it will not touch
3723 * us.
3724 */
David Chinnerda353b02007-08-28 14:00:13 +10003725 write_lock(&pag->pag_ici_lock);
David Chinnerf273ab82006-09-28 11:06:03 +10003726 spin_lock(&ip->i_flags_lock);
David Chinner7a18c382006-11-11 18:04:54 +11003727 if (__xfs_iflags_test(ip, XFS_IRECLAIM) ||
3728 (!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) && vp == NULL)) {
David Chinnerf273ab82006-09-28 11:06:03 +10003729 spin_unlock(&ip->i_flags_lock);
David Chinnerda353b02007-08-28 14:00:13 +10003730 write_unlock(&pag->pag_ici_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003731 if (locked) {
3732 xfs_ifunlock(ip);
3733 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3734 }
Jesper Juhl014c2542006-01-15 02:37:08 +01003735 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003736 }
David Chinner7a18c382006-11-11 18:04:54 +11003737 __xfs_iflags_set(ip, XFS_IRECLAIM);
David Chinnerf273ab82006-09-28 11:06:03 +10003738 spin_unlock(&ip->i_flags_lock);
David Chinnerda353b02007-08-28 14:00:13 +10003739 write_unlock(&pag->pag_ici_lock);
3740 xfs_put_perag(ip->i_mount, pag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003741
3742 /*
3743 * If the inode is still dirty, then flush it out. If the inode
3744 * is not in the AIL, then it will be OK to flush it delwri as
3745 * long as xfs_iflush() does not keep any references to the inode.
3746 * We leave that decision up to xfs_iflush() since it has the
3747 * knowledge of whether it's OK to simply do a delwri flush of
3748 * the inode or whether we need to wait until the inode is
3749 * pulled from the AIL.
3750 * We get the flush lock regardless, though, just to make sure
3751 * we don't free it while it is being flushed.
3752 */
3753 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
3754 if (!locked) {
3755 xfs_ilock(ip, XFS_ILOCK_EXCL);
3756 xfs_iflock(ip);
3757 }
3758
3759 if (ip->i_update_core ||
3760 ((ip->i_itemp != NULL) &&
3761 (ip->i_itemp->ili_format.ilf_fields != 0))) {
3762 error = xfs_iflush(ip, sync_mode);
3763 /*
3764 * If we hit an error, typically because of filesystem
3765 * shutdown, we don't need to let vn_reclaim to know
3766 * because we're gonna reclaim the inode anyway.
3767 */
3768 if (error) {
3769 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3770 goto reclaim;
3771 }
3772 xfs_iflock(ip); /* synchronize with xfs_iflush_done */
3773 }
3774
3775 ASSERT(ip->i_update_core == 0);
3776 ASSERT(ip->i_itemp == NULL ||
3777 ip->i_itemp->ili_format.ilf_fields == 0);
3778 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3779 } else if (locked) {
3780 /*
3781 * We are not interested in doing an iflush if we're
3782 * in the process of shutting down the filesystem forcibly.
3783 * So, just reclaim the inode.
3784 */
3785 xfs_ifunlock(ip);
3786 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3787 }
3788
3789 reclaim:
3790 xfs_ireclaim(ip);
3791 return 0;
3792}
3793
3794int
3795xfs_finish_reclaim_all(xfs_mount_t *mp, int noblock)
3796{
3797 int purged;
3798 xfs_inode_t *ip, *n;
3799 int done = 0;
3800
3801 while (!done) {
3802 purged = 0;
3803 XFS_MOUNT_ILOCK(mp);
3804 list_for_each_entry_safe(ip, n, &mp->m_del_inodes, i_reclaim) {
3805 if (noblock) {
3806 if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0)
3807 continue;
3808 if (xfs_ipincount(ip) ||
3809 !xfs_iflock_nowait(ip)) {
3810 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3811 continue;
3812 }
3813 }
3814 XFS_MOUNT_IUNLOCK(mp);
Felix Blyakher6b2cf612005-11-25 16:42:13 +11003815 if (xfs_finish_reclaim(ip, noblock,
3816 XFS_IFLUSH_DELWRI_ELSE_ASYNC))
3817 delay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818 purged = 1;
3819 break;
3820 }
3821
3822 done = !purged;
3823 }
3824
3825 XFS_MOUNT_IUNLOCK(mp);
3826 return 0;
3827}
3828
3829/*
3830 * xfs_alloc_file_space()
3831 * This routine allocates disk space for the given file.
3832 *
3833 * If alloc_type == 0, this request is for an ALLOCSP type
3834 * request which will change the file size. In this case, no
3835 * DMAPI event will be generated by the call. A TRUNCATE event
3836 * will be generated later by xfs_setattr.
3837 *
3838 * If alloc_type != 0, this request is for a RESVSP type
3839 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
3840 * lower block boundary byte address is less than the file's
3841 * length.
3842 *
3843 * RETURNS:
3844 * 0 on success
3845 * errno on error
3846 *
3847 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10003848STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07003849xfs_alloc_file_space(
3850 xfs_inode_t *ip,
3851 xfs_off_t offset,
3852 xfs_off_t len,
3853 int alloc_type,
3854 int attr_flags)
3855{
Nathan Scottdd9f4382006-01-11 15:28:28 +11003856 xfs_mount_t *mp = ip->i_mount;
3857 xfs_off_t count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003858 xfs_filblks_t allocated_fsb;
3859 xfs_filblks_t allocatesize_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +11003860 xfs_extlen_t extsz, temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003861 xfs_fileoff_t startoffset_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +11003862 xfs_fsblock_t firstfsb;
3863 int nimaps;
3864 int bmapi_flag;
3865 int quota_flag;
3866 int rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003867 xfs_trans_t *tp;
Nathan Scottdd9f4382006-01-11 15:28:28 +11003868 xfs_bmbt_irec_t imaps[1], *imapp;
3869 xfs_bmap_free_t free_list;
3870 uint qblocks, resblks, resrtextents;
3871 int committed;
3872 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003873
Christoph Hellwig1543d792007-08-29 11:46:47 +10003874 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003875
3876 if (XFS_FORCED_SHUTDOWN(mp))
3877 return XFS_ERROR(EIO);
3878
Linus Torvalds1da177e2005-04-16 15:20:36 -07003879 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
3880 return error;
3881
3882 if (len <= 0)
3883 return XFS_ERROR(EINVAL);
3884
David Chinner957d0eb2007-06-18 16:50:37 +10003885 rt = XFS_IS_REALTIME_INODE(ip);
3886 extsz = xfs_get_extsz_hint(ip);
3887
Linus Torvalds1da177e2005-04-16 15:20:36 -07003888 count = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003889 imapp = &imaps[0];
Nathan Scottdd9f4382006-01-11 15:28:28 +11003890 nimaps = 1;
3891 bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003892 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
3893 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
3894
3895 /* Generate a DMAPI event if needed. */
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10003896 if (alloc_type != 0 && offset < ip->i_size &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07003897 (attr_flags&ATTR_DMI) == 0 &&
Christoph Hellwigeb9df392007-08-16 18:42:07 +10003898 DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003899 xfs_off_t end_dmi_offset;
3900
3901 end_dmi_offset = offset+len;
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10003902 if (end_dmi_offset > ip->i_size)
3903 end_dmi_offset = ip->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003904 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, XFS_ITOV(ip),
3905 offset, end_dmi_offset - offset,
3906 0, NULL);
3907 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01003908 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003909 }
3910
3911 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11003912 * Allocate file space until done or until there is an error
Linus Torvalds1da177e2005-04-16 15:20:36 -07003913 */
3914retry:
3915 while (allocatesize_fsb && !error) {
Nathan Scottdd9f4382006-01-11 15:28:28 +11003916 xfs_fileoff_t s, e;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003917
Nathan Scottdd9f4382006-01-11 15:28:28 +11003918 /*
Nathan Scott3ddb8fa2006-01-11 15:33:02 +11003919 * Determine space reservations for data/realtime.
Nathan Scottdd9f4382006-01-11 15:28:28 +11003920 */
3921 if (unlikely(extsz)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003922 s = startoffset_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +11003923 do_div(s, extsz);
3924 s *= extsz;
3925 e = startoffset_fsb + allocatesize_fsb;
3926 if ((temp = do_mod(startoffset_fsb, extsz)))
3927 e += temp;
3928 if ((temp = do_mod(e, extsz)))
3929 e += extsz - temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003930 } else {
Nathan Scottdd9f4382006-01-11 15:28:28 +11003931 s = 0;
3932 e = allocatesize_fsb;
3933 }
3934
3935 if (unlikely(rt)) {
3936 resrtextents = qblocks = (uint)(e - s);
3937 resrtextents /= mp->m_sb.sb_rextsize;
3938 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
3939 quota_flag = XFS_QMOPT_RES_RTBLKS;
3940 } else {
3941 resrtextents = 0;
3942 resblks = qblocks = \
3943 XFS_DIOSTRAT_SPACE_RES(mp, (uint)(e - s));
3944 quota_flag = XFS_QMOPT_RES_REGBLKS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003945 }
3946
3947 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11003948 * Allocate and setup the transaction.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003949 */
3950 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
Nathan Scottdd9f4382006-01-11 15:28:28 +11003951 error = xfs_trans_reserve(tp, resblks,
3952 XFS_WRITE_LOG_RES(mp), resrtextents,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003953 XFS_TRANS_PERM_LOG_RES,
3954 XFS_WRITE_LOG_COUNT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003955 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11003956 * Check for running out of space
Linus Torvalds1da177e2005-04-16 15:20:36 -07003957 */
3958 if (error) {
3959 /*
3960 * Free the transaction structure.
3961 */
3962 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
3963 xfs_trans_cancel(tp, 0);
3964 break;
3965 }
3966 xfs_ilock(ip, XFS_ILOCK_EXCL);
Nathan Scottdd9f4382006-01-11 15:28:28 +11003967 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
3968 qblocks, 0, quota_flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003969 if (error)
3970 goto error1;
3971
3972 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
3973 xfs_trans_ihold(tp, ip);
3974
3975 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11003976 * Issue the xfs_bmapi() call to allocate the blocks
Linus Torvalds1da177e2005-04-16 15:20:36 -07003977 */
3978 XFS_BMAP_INIT(&free_list, &firstfsb);
Olaf Weber3e57ecf2006-06-09 14:48:12 +10003979 error = XFS_BMAPI(mp, tp, &ip->i_iocore, startoffset_fsb,
Nathan Scottdd9f4382006-01-11 15:28:28 +11003980 allocatesize_fsb, bmapi_flag,
3981 &firstfsb, 0, imapp, &nimaps,
Olaf Weber3e57ecf2006-06-09 14:48:12 +10003982 &free_list, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003983 if (error) {
3984 goto error0;
3985 }
3986
3987 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +11003988 * Complete the transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -07003989 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +11003990 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003991 if (error) {
3992 goto error0;
3993 }
3994
Eric Sandeen1c72bf92007-05-08 13:48:42 +10003995 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003996 xfs_iunlock(ip, XFS_ILOCK_EXCL);
3997 if (error) {
3998 break;
3999 }
4000
4001 allocated_fsb = imapp->br_blockcount;
4002
Nathan Scottdd9f4382006-01-11 15:28:28 +11004003 if (nimaps == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004004 error = XFS_ERROR(ENOSPC);
4005 break;
4006 }
4007
4008 startoffset_fsb += allocated_fsb;
4009 allocatesize_fsb -= allocated_fsb;
4010 }
4011dmapi_enospc_check:
Christoph Hellwigeb9df392007-08-16 18:42:07 +10004012 if (error == ENOSPC && (attr_flags & ATTR_DMI) == 0 &&
4013 DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004014 error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE,
4015 XFS_ITOV(ip), DM_RIGHT_NULL,
4016 XFS_ITOV(ip), DM_RIGHT_NULL,
4017 NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */
4018 if (error == 0)
4019 goto retry; /* Maybe DMAPI app. has made space */
4020 /* else fall through with error from XFS_SEND_DATA */
4021 }
4022
4023 return error;
4024
Nathan Scottdd9f4382006-01-11 15:28:28 +11004025error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004026 xfs_bmap_cancel(&free_list);
Nathan Scottdd9f4382006-01-11 15:28:28 +11004027 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
4028
4029error1: /* Just cancel transaction */
Linus Torvalds1da177e2005-04-16 15:20:36 -07004030 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
4031 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4032 goto dmapi_enospc_check;
4033}
4034
4035/*
4036 * Zero file bytes between startoff and endoff inclusive.
4037 * The iolock is held exclusive and no blocks are buffered.
4038 */
4039STATIC int
4040xfs_zero_remaining_bytes(
4041 xfs_inode_t *ip,
4042 xfs_off_t startoff,
4043 xfs_off_t endoff)
4044{
4045 xfs_bmbt_irec_t imap;
4046 xfs_fileoff_t offset_fsb;
4047 xfs_off_t lastoffset;
4048 xfs_off_t offset;
4049 xfs_buf_t *bp;
4050 xfs_mount_t *mp = ip->i_mount;
4051 int nimap;
4052 int error = 0;
4053
4054 bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
4055 ip->i_d.di_flags & XFS_DIFLAG_REALTIME ?
4056 mp->m_rtdev_targp : mp->m_ddev_targp);
4057
4058 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
4059 offset_fsb = XFS_B_TO_FSBT(mp, offset);
4060 nimap = 1;
Olaf Weber3e57ecf2006-06-09 14:48:12 +10004061 error = XFS_BMAPI(mp, NULL, &ip->i_iocore, offset_fsb, 1, 0,
4062 NULL, 0, &imap, &nimap, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004063 if (error || nimap < 1)
4064 break;
4065 ASSERT(imap.br_blockcount >= 1);
4066 ASSERT(imap.br_startoff == offset_fsb);
4067 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
4068 if (lastoffset > endoff)
4069 lastoffset = endoff;
4070 if (imap.br_startblock == HOLESTARTBLOCK)
4071 continue;
4072 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
4073 if (imap.br_state == XFS_EXT_UNWRITTEN)
4074 continue;
4075 XFS_BUF_UNDONE(bp);
4076 XFS_BUF_UNWRITE(bp);
4077 XFS_BUF_READ(bp);
4078 XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock));
4079 xfsbdstrat(mp, bp);
4080 if ((error = xfs_iowait(bp))) {
4081 xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
4082 mp, bp, XFS_BUF_ADDR(bp));
4083 break;
4084 }
4085 memset(XFS_BUF_PTR(bp) +
4086 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
4087 0, lastoffset - offset + 1);
4088 XFS_BUF_UNDONE(bp);
4089 XFS_BUF_UNREAD(bp);
4090 XFS_BUF_WRITE(bp);
4091 xfsbdstrat(mp, bp);
4092 if ((error = xfs_iowait(bp))) {
4093 xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
4094 mp, bp, XFS_BUF_ADDR(bp));
4095 break;
4096 }
4097 }
4098 xfs_buf_free(bp);
4099 return error;
4100}
4101
4102/*
4103 * xfs_free_file_space()
4104 * This routine frees disk space for the given file.
4105 *
4106 * This routine is only called by xfs_change_file_space
4107 * for an UNRESVSP type call.
4108 *
4109 * RETURNS:
4110 * 0 on success
4111 * errno on error
4112 *
4113 */
4114STATIC int
4115xfs_free_file_space(
4116 xfs_inode_t *ip,
4117 xfs_off_t offset,
4118 xfs_off_t len,
4119 int attr_flags)
4120{
Nathan Scott67fcaa72006-06-09 17:00:52 +10004121 bhv_vnode_t *vp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004122 int committed;
4123 int done;
4124 xfs_off_t end_dmi_offset;
4125 xfs_fileoff_t endoffset_fsb;
4126 int error;
4127 xfs_fsblock_t firstfsb;
4128 xfs_bmap_free_t free_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004129 xfs_bmbt_irec_t imap;
4130 xfs_off_t ioffset;
4131 xfs_extlen_t mod=0;
4132 xfs_mount_t *mp;
4133 int nimap;
4134 uint resblks;
Nathan Scott673cdf52006-09-28 10:56:26 +10004135 uint rounding;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004136 int rt;
4137 xfs_fileoff_t startoffset_fsb;
4138 xfs_trans_t *tp;
Dean Roehrich5fcbab32005-05-05 13:27:19 -07004139 int need_iolock = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004140
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004141 vp = XFS_ITOV(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004142 mp = ip->i_mount;
4143
Christoph Hellwig1543d792007-08-29 11:46:47 +10004144 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004145
Linus Torvalds1da177e2005-04-16 15:20:36 -07004146 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
4147 return error;
4148
4149 error = 0;
4150 if (len <= 0) /* if nothing being freed */
4151 return error;
4152 rt = (ip->i_d.di_flags & XFS_DIFLAG_REALTIME);
4153 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
4154 end_dmi_offset = offset + len;
4155 endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset);
4156
Christoph Hellwigeb9df392007-08-16 18:42:07 +10004157 if (offset < ip->i_size && (attr_flags & ATTR_DMI) == 0 &&
4158 DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) {
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10004159 if (end_dmi_offset > ip->i_size)
4160 end_dmi_offset = ip->i_size;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004161 error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, vp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004162 offset, end_dmi_offset - offset,
4163 AT_DELAY_FLAG(attr_flags), NULL);
4164 if (error)
Jesper Juhl014c2542006-01-15 02:37:08 +01004165 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004166 }
4167
Dean Roehrich5fcbab32005-05-05 13:27:19 -07004168 if (attr_flags & ATTR_NOLOCK)
4169 need_iolock = 0;
Yingping Lu9fa80462006-03-22 12:44:35 +11004170 if (need_iolock) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004171 xfs_ilock(ip, XFS_IOLOCK_EXCL);
Christoph Hellwigb677c212007-08-29 11:46:28 +10004172 vn_iowait(ip); /* wait for the completion of any pending DIOs */
Yingping Lu9fa80462006-03-22 12:44:35 +11004173 }
Dean Roehrich5fcbab32005-05-05 13:27:19 -07004174
Nathan Scott673cdf52006-09-28 10:56:26 +10004175 rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, NBPP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004176 ioffset = offset & ~(rounding - 1);
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004177
4178 if (VN_CACHED(vp) != 0) {
4179 xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1,
4180 ctooff(offtoct(ioffset)), -1);
Christoph Hellwig739bfb22007-08-29 10:58:01 +10004181 error = xfs_flushinval_pages(ip,
4182 ctooff(offtoct(ioffset)),
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004183 -1, FI_REMAPF_LOCKED);
Lachlan McIlroyd3cf2092007-05-08 13:49:27 +10004184 if (error)
4185 goto out_unlock_iolock;
Christoph Hellwigbd5a8762005-06-21 15:47:39 +10004186 }
4187
Linus Torvalds1da177e2005-04-16 15:20:36 -07004188 /*
4189 * Need to zero the stuff we're not freeing, on disk.
4190 * If its a realtime file & can't use unwritten extents then we
4191 * actually need to zero the extent edges. Otherwise xfs_bunmapi
4192 * will take care of it for us.
4193 */
4194 if (rt && !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
4195 nimap = 1;
Olaf Weber3e57ecf2006-06-09 14:48:12 +10004196 error = XFS_BMAPI(mp, NULL, &ip->i_iocore, startoffset_fsb,
4197 1, 0, NULL, 0, &imap, &nimap, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004198 if (error)
4199 goto out_unlock_iolock;
4200 ASSERT(nimap == 0 || nimap == 1);
4201 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
4202 xfs_daddr_t block;
4203
4204 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
4205 block = imap.br_startblock;
4206 mod = do_div(block, mp->m_sb.sb_rextsize);
4207 if (mod)
4208 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
4209 }
4210 nimap = 1;
Olaf Weber3e57ecf2006-06-09 14:48:12 +10004211 error = XFS_BMAPI(mp, NULL, &ip->i_iocore, endoffset_fsb - 1,
4212 1, 0, NULL, 0, &imap, &nimap, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004213 if (error)
4214 goto out_unlock_iolock;
4215 ASSERT(nimap == 0 || nimap == 1);
4216 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
4217 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
4218 mod++;
4219 if (mod && (mod != mp->m_sb.sb_rextsize))
4220 endoffset_fsb -= mod;
4221 }
4222 }
4223 if ((done = (endoffset_fsb <= startoffset_fsb)))
4224 /*
4225 * One contiguous piece to clear
4226 */
4227 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
4228 else {
4229 /*
4230 * Some full blocks, possibly two pieces to clear
4231 */
4232 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
4233 error = xfs_zero_remaining_bytes(ip, offset,
4234 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
4235 if (!error &&
4236 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
4237 error = xfs_zero_remaining_bytes(ip,
4238 XFS_FSB_TO_B(mp, endoffset_fsb),
4239 offset + len - 1);
4240 }
4241
4242 /*
4243 * free file space until done or until there is an error
4244 */
4245 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
4246 while (!error && !done) {
4247
4248 /*
David Chinner91ebecc2007-07-19 16:28:30 +10004249 * allocate and setup the transaction. Allow this
4250 * transaction to dip into the reserve blocks to ensure
4251 * the freeing of the space succeeds at ENOSPC.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004252 */
4253 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
David Chinner91ebecc2007-07-19 16:28:30 +10004254 tp->t_flags |= XFS_TRANS_RESERVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004255 error = xfs_trans_reserve(tp,
4256 resblks,
4257 XFS_WRITE_LOG_RES(mp),
4258 0,
4259 XFS_TRANS_PERM_LOG_RES,
4260 XFS_WRITE_LOG_COUNT);
4261
4262 /*
4263 * check for running out of space
4264 */
4265 if (error) {
4266 /*
4267 * Free the transaction structure.
4268 */
4269 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
4270 xfs_trans_cancel(tp, 0);
4271 break;
4272 }
4273 xfs_ilock(ip, XFS_ILOCK_EXCL);
4274 error = XFS_TRANS_RESERVE_QUOTA(mp, tp,
Nathan Scottdd9f4382006-01-11 15:28:28 +11004275 ip->i_udquot, ip->i_gdquot, resblks, 0,
4276 XFS_QMOPT_RES_REGBLKS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004277 if (error)
4278 goto error1;
4279
4280 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
4281 xfs_trans_ihold(tp, ip);
4282
4283 /*
4284 * issue the bunmapi() call to free the blocks
4285 */
4286 XFS_BMAP_INIT(&free_list, &firstfsb);
Olaf Weber3e57ecf2006-06-09 14:48:12 +10004287 error = XFS_BUNMAPI(mp, tp, &ip->i_iocore, startoffset_fsb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004288 endoffset_fsb - startoffset_fsb,
Olaf Weber3e57ecf2006-06-09 14:48:12 +10004289 0, 2, &firstfsb, &free_list, NULL, &done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004290 if (error) {
4291 goto error0;
4292 }
4293
4294 /*
4295 * complete the transaction
4296 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +11004297 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004298 if (error) {
4299 goto error0;
4300 }
4301
Eric Sandeen1c72bf92007-05-08 13:48:42 +10004302 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004303 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4304 }
4305
4306 out_unlock_iolock:
4307 if (need_iolock)
4308 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
4309 return error;
4310
4311 error0:
4312 xfs_bmap_cancel(&free_list);
4313 error1:
4314 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
4315 xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) :
4316 XFS_ILOCK_EXCL);
4317 return error;
4318}
4319
4320/*
4321 * xfs_change_file_space()
4322 * This routine allocates or frees disk space for the given file.
4323 * The user specified parameters are checked for alignment and size
4324 * limitations.
4325 *
4326 * RETURNS:
4327 * 0 on success
4328 * errno on error
4329 *
4330 */
4331int
4332xfs_change_file_space(
Christoph Hellwig993386c2007-08-28 16:12:30 +10004333 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004334 int cmd,
4335 xfs_flock64_t *bf,
4336 xfs_off_t offset,
4337 cred_t *credp,
4338 int attr_flags)
4339{
Christoph Hellwig993386c2007-08-28 16:12:30 +10004340 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004341 int clrprealloc;
4342 int error;
4343 xfs_fsize_t fsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004344 int setprealloc;
4345 xfs_off_t startoffset;
4346 xfs_off_t llen;
4347 xfs_trans_t *tp;
Nathan Scott8285fb52006-06-09 17:07:12 +10004348 bhv_vattr_t va;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004349
Christoph Hellwig1543d792007-08-29 11:46:47 +10004350 vn_trace_entry(ip, __FUNCTION__, (inst_t *)__return_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004351
4352 /*
4353 * must be a regular file and have write permission
4354 */
Christoph Hellwig993386c2007-08-28 16:12:30 +10004355 if (!S_ISREG(ip->i_d.di_mode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004356 return XFS_ERROR(EINVAL);
4357
4358 xfs_ilock(ip, XFS_ILOCK_SHARED);
4359
4360 if ((error = xfs_iaccess(ip, S_IWUSR, credp))) {
4361 xfs_iunlock(ip, XFS_ILOCK_SHARED);
4362 return error;
4363 }
4364
4365 xfs_iunlock(ip, XFS_ILOCK_SHARED);
4366
4367 switch (bf->l_whence) {
4368 case 0: /*SEEK_SET*/
4369 break;
4370 case 1: /*SEEK_CUR*/
4371 bf->l_start += offset;
4372 break;
4373 case 2: /*SEEK_END*/
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10004374 bf->l_start += ip->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004375 break;
4376 default:
4377 return XFS_ERROR(EINVAL);
4378 }
4379
4380 llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len;
4381
4382 if ( (bf->l_start < 0)
4383 || (bf->l_start > XFS_MAXIOFFSET(mp))
4384 || (bf->l_start + llen < 0)
4385 || (bf->l_start + llen > XFS_MAXIOFFSET(mp)))
4386 return XFS_ERROR(EINVAL);
4387
4388 bf->l_whence = 0;
4389
4390 startoffset = bf->l_start;
Lachlan McIlroyba87ea62007-05-08 13:49:46 +10004391 fsize = ip->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004392
4393 /*
4394 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
4395 * file space.
4396 * These calls do NOT zero the data space allocated to the file,
4397 * nor do they change the file size.
4398 *
4399 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
4400 * space.
4401 * These calls cause the new file data to be zeroed and the file
4402 * size to be changed.
4403 */
4404 setprealloc = clrprealloc = 0;
4405
4406 switch (cmd) {
4407 case XFS_IOC_RESVSP:
4408 case XFS_IOC_RESVSP64:
4409 error = xfs_alloc_file_space(ip, startoffset, bf->l_len,
4410 1, attr_flags);
4411 if (error)
4412 return error;
4413 setprealloc = 1;
4414 break;
4415
4416 case XFS_IOC_UNRESVSP:
4417 case XFS_IOC_UNRESVSP64:
4418 if ((error = xfs_free_file_space(ip, startoffset, bf->l_len,
4419 attr_flags)))
4420 return error;
4421 break;
4422
4423 case XFS_IOC_ALLOCSP:
4424 case XFS_IOC_ALLOCSP64:
4425 case XFS_IOC_FREESP:
4426 case XFS_IOC_FREESP64:
4427 if (startoffset > fsize) {
4428 error = xfs_alloc_file_space(ip, fsize,
4429 startoffset - fsize, 0, attr_flags);
4430 if (error)
4431 break;
4432 }
4433
4434 va.va_mask = XFS_AT_SIZE;
4435 va.va_size = startoffset;
4436
Christoph Hellwig993386c2007-08-28 16:12:30 +10004437 error = xfs_setattr(ip, &va, attr_flags, credp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004438
4439 if (error)
4440 return error;
4441
4442 clrprealloc = 1;
4443 break;
4444
4445 default:
4446 ASSERT(0);
4447 return XFS_ERROR(EINVAL);
4448 }
4449
4450 /*
4451 * update the inode timestamp, mode, and prealloc flag bits
4452 */
4453 tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID);
4454
4455 if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp),
4456 0, 0, 0))) {
4457 /* ASSERT(0); */
4458 xfs_trans_cancel(tp, 0);
4459 return error;
4460 }
4461
4462 xfs_ilock(ip, XFS_ILOCK_EXCL);
4463
4464 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
4465 xfs_trans_ihold(tp, ip);
4466
4467 if ((attr_flags & ATTR_DMI) == 0) {
4468 ip->i_d.di_mode &= ~S_ISUID;
4469
4470 /*
4471 * Note that we don't have to worry about mandatory
4472 * file locking being disabled here because we only
4473 * clear the S_ISGID bit if the Group execute bit is
4474 * on, but if it was on then mandatory locking wouldn't
4475 * have been enabled.
4476 */
4477 if (ip->i_d.di_mode & S_IXGRP)
4478 ip->i_d.di_mode &= ~S_ISGID;
4479
4480 xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
4481 }
4482 if (setprealloc)
4483 ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
4484 else if (clrprealloc)
4485 ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;
4486
4487 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
4488 xfs_trans_set_sync(tp);
4489
Eric Sandeen1c72bf92007-05-08 13:48:42 +10004490 error = xfs_trans_commit(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004491
4492 xfs_iunlock(ip, XFS_ILOCK_EXCL);
4493
4494 return error;
4495}