Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
27 | #include "xfs_dir.h" | |
28 | #include "xfs_dir2.h" | |
29 | #include "xfs_dmapi.h" | |
30 | #include "xfs_mount.h" | |
a844f451 | 31 | #include "xfs_da_btree.h" |
1da177e4 | 32 | #include "xfs_bmap_btree.h" |
a844f451 | 33 | #include "xfs_alloc_btree.h" |
1da177e4 | 34 | #include "xfs_ialloc_btree.h" |
1da177e4 LT |
35 | #include "xfs_dir_sf.h" |
36 | #include "xfs_dir2_sf.h" | |
a844f451 | 37 | #include "xfs_attr_sf.h" |
1da177e4 | 38 | #include "xfs_dinode.h" |
1da177e4 | 39 | #include "xfs_inode.h" |
a844f451 NS |
40 | #include "xfs_inode_item.h" |
41 | #include "xfs_dir_leaf.h" | |
42 | #include "xfs_itable.h" | |
43 | #include "xfs_btree.h" | |
44 | #include "xfs_ialloc.h" | |
45 | #include "xfs_alloc.h" | |
1da177e4 | 46 | #include "xfs_bmap.h" |
1da177e4 LT |
47 | #include "xfs_attr.h" |
48 | #include "xfs_rw.h" | |
1da177e4 | 49 | #include "xfs_error.h" |
1da177e4 LT |
50 | #include "xfs_quota.h" |
51 | #include "xfs_utils.h" | |
a844f451 NS |
52 | #include "xfs_rtalloc.h" |
53 | #include "xfs_refcache.h" | |
1da177e4 | 54 | #include "xfs_trans_space.h" |
1da177e4 | 55 | #include "xfs_log_priv.h" |
a844f451 | 56 | #include "xfs_mac.h" |
1da177e4 LT |
57 | |
58 | ||
59 | /* | |
60 | * The maximum pathlen is 1024 bytes. Since the minimum file system | |
61 | * blocksize is 512 bytes, we can get a max of 2 extents back from | |
62 | * bmapi. | |
63 | */ | |
64 | #define SYMLINK_MAPS 2 | |
65 | ||
66 | /* | |
67 | * For xfs, we check that the file isn't too big to be opened by this kernel. | |
68 | * No other open action is required for regular files. Devices are handled | |
69 | * through the specfs file system, pipes through fifofs. Device and | |
70 | * fifo vnodes are "wrapped" by specfs and fifofs vnodes, respectively, | |
71 | * when a new vnode is first looked up or created. | |
72 | */ | |
73 | STATIC int | |
74 | xfs_open( | |
75 | bhv_desc_t *bdp, | |
76 | cred_t *credp) | |
77 | { | |
78 | int mode; | |
79 | vnode_t *vp; | |
80 | xfs_inode_t *ip; | |
81 | ||
82 | vp = BHV_TO_VNODE(bdp); | |
83 | ip = XFS_BHVTOI(bdp); | |
84 | ||
85 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
86 | return XFS_ERROR(EIO); | |
87 | ||
88 | /* | |
89 | * If it's a directory with any blocks, read-ahead block 0 | |
90 | * as we're almost certain to have the next operation be a read there. | |
91 | */ | |
0432dab2 | 92 | if (VN_ISDIR(vp) && ip->i_d.di_nextents > 0) { |
1da177e4 LT |
93 | mode = xfs_ilock_map_shared(ip); |
94 | if (ip->i_d.di_nextents > 0) | |
95 | (void)xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK); | |
96 | xfs_iunlock(ip, mode); | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
101 | ||
102 | /* | |
103 | * xfs_getattr | |
104 | */ | |
105 | STATIC int | |
106 | xfs_getattr( | |
107 | bhv_desc_t *bdp, | |
108 | vattr_t *vap, | |
109 | int flags, | |
110 | cred_t *credp) | |
111 | { | |
112 | xfs_inode_t *ip; | |
113 | xfs_mount_t *mp; | |
114 | vnode_t *vp; | |
115 | ||
116 | vp = BHV_TO_VNODE(bdp); | |
117 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
118 | ||
119 | ip = XFS_BHVTOI(bdp); | |
120 | mp = ip->i_mount; | |
121 | ||
122 | if (XFS_FORCED_SHUTDOWN(mp)) | |
123 | return XFS_ERROR(EIO); | |
124 | ||
125 | if (!(flags & ATTR_LAZY)) | |
126 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
127 | ||
128 | vap->va_size = ip->i_d.di_size; | |
129 | if (vap->va_mask == XFS_AT_SIZE) | |
130 | goto all_done; | |
131 | ||
132 | vap->va_nblocks = | |
133 | XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); | |
134 | vap->va_nodeid = ip->i_ino; | |
135 | #if XFS_BIG_INUMS | |
136 | vap->va_nodeid += mp->m_inoadd; | |
137 | #endif | |
138 | vap->va_nlink = ip->i_d.di_nlink; | |
139 | ||
140 | /* | |
141 | * Quick exit for non-stat callers | |
142 | */ | |
143 | if ((vap->va_mask & | |
144 | ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID| | |
145 | XFS_AT_NLINK|XFS_AT_BLKSIZE)) == 0) | |
146 | goto all_done; | |
147 | ||
148 | /* | |
149 | * Copy from in-core inode. | |
150 | */ | |
0432dab2 | 151 | vap->va_mode = ip->i_d.di_mode; |
1da177e4 LT |
152 | vap->va_uid = ip->i_d.di_uid; |
153 | vap->va_gid = ip->i_d.di_gid; | |
154 | vap->va_projid = ip->i_d.di_projid; | |
155 | ||
156 | /* | |
157 | * Check vnode type block/char vs. everything else. | |
1da177e4 | 158 | */ |
0432dab2 CH |
159 | switch (ip->i_d.di_mode & S_IFMT) { |
160 | case S_IFBLK: | |
161 | case S_IFCHR: | |
162 | vap->va_rdev = ip->i_df.if_u2.if_rdev; | |
163 | vap->va_blocksize = BLKDEV_IOSIZE; | |
164 | break; | |
165 | default: | |
1da177e4 LT |
166 | vap->va_rdev = 0; |
167 | ||
168 | if (!(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) { | |
e8c8b3a7 | 169 | vap->va_blocksize = xfs_preferred_iosize(mp); |
1da177e4 LT |
170 | } else { |
171 | ||
172 | /* | |
173 | * If the file blocks are being allocated from a | |
174 | * realtime partition, then return the inode's | |
175 | * realtime extent size or the realtime volume's | |
176 | * extent size. | |
177 | */ | |
178 | vap->va_blocksize = ip->i_d.di_extsize ? | |
179 | (ip->i_d.di_extsize << mp->m_sb.sb_blocklog) : | |
180 | (mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog); | |
181 | } | |
0432dab2 | 182 | break; |
1da177e4 LT |
183 | } |
184 | ||
185 | vap->va_atime.tv_sec = ip->i_d.di_atime.t_sec; | |
186 | vap->va_atime.tv_nsec = ip->i_d.di_atime.t_nsec; | |
187 | vap->va_mtime.tv_sec = ip->i_d.di_mtime.t_sec; | |
188 | vap->va_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; | |
189 | vap->va_ctime.tv_sec = ip->i_d.di_ctime.t_sec; | |
190 | vap->va_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; | |
191 | ||
192 | /* | |
193 | * Exit for stat callers. See if any of the rest of the fields | |
194 | * to be filled in are needed. | |
195 | */ | |
196 | if ((vap->va_mask & | |
197 | (XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS| | |
198 | XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0) | |
199 | goto all_done; | |
200 | ||
201 | /* | |
202 | * Convert di_flags to xflags. | |
203 | */ | |
204 | vap->va_xflags = xfs_ip2xflags(ip); | |
205 | ||
206 | /* | |
207 | * Exit for inode revalidate. See if any of the rest of | |
208 | * the fields to be filled in are needed. | |
209 | */ | |
210 | if ((vap->va_mask & | |
211 | (XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS| | |
212 | XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0) | |
213 | goto all_done; | |
214 | ||
215 | vap->va_extsize = ip->i_d.di_extsize << mp->m_sb.sb_blocklog; | |
216 | vap->va_nextents = | |
217 | (ip->i_df.if_flags & XFS_IFEXTENTS) ? | |
218 | ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) : | |
219 | ip->i_d.di_nextents; | |
220 | if (ip->i_afp) | |
221 | vap->va_anextents = | |
222 | (ip->i_afp->if_flags & XFS_IFEXTENTS) ? | |
223 | ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) : | |
224 | ip->i_d.di_anextents; | |
225 | else | |
226 | vap->va_anextents = 0; | |
227 | vap->va_gen = ip->i_d.di_gen; | |
228 | ||
229 | all_done: | |
230 | if (!(flags & ATTR_LAZY)) | |
231 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | ||
236 | /* | |
237 | * xfs_setattr | |
238 | */ | |
239 | int | |
240 | xfs_setattr( | |
241 | bhv_desc_t *bdp, | |
242 | vattr_t *vap, | |
243 | int flags, | |
244 | cred_t *credp) | |
245 | { | |
246 | xfs_inode_t *ip; | |
247 | xfs_trans_t *tp; | |
248 | xfs_mount_t *mp; | |
249 | int mask; | |
250 | int code; | |
251 | uint lock_flags; | |
252 | uint commit_flags=0; | |
253 | uid_t uid=0, iuid=0; | |
254 | gid_t gid=0, igid=0; | |
255 | int timeflags = 0; | |
256 | vnode_t *vp; | |
257 | xfs_prid_t projid=0, iprojid=0; | |
258 | int mandlock_before, mandlock_after; | |
259 | struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2; | |
260 | int file_owner; | |
5fcbab35 | 261 | int need_iolock = 1; |
1da177e4 LT |
262 | |
263 | vp = BHV_TO_VNODE(bdp); | |
264 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
265 | ||
266 | if (vp->v_vfsp->vfs_flag & VFS_RDONLY) | |
267 | return XFS_ERROR(EROFS); | |
268 | ||
269 | /* | |
270 | * Cannot set certain attributes. | |
271 | */ | |
272 | mask = vap->va_mask; | |
273 | if (mask & XFS_AT_NOSET) { | |
274 | return XFS_ERROR(EINVAL); | |
275 | } | |
276 | ||
277 | ip = XFS_BHVTOI(bdp); | |
278 | mp = ip->i_mount; | |
279 | ||
280 | if (XFS_FORCED_SHUTDOWN(mp)) | |
281 | return XFS_ERROR(EIO); | |
282 | ||
283 | /* | |
284 | * Timestamps do not need to be logged and hence do not | |
285 | * need to be done within a transaction. | |
286 | */ | |
287 | if (mask & XFS_AT_UPDTIMES) { | |
288 | ASSERT((mask & ~XFS_AT_UPDTIMES) == 0); | |
289 | timeflags = ((mask & XFS_AT_UPDATIME) ? XFS_ICHGTIME_ACC : 0) | | |
290 | ((mask & XFS_AT_UPDCTIME) ? XFS_ICHGTIME_CHG : 0) | | |
291 | ((mask & XFS_AT_UPDMTIME) ? XFS_ICHGTIME_MOD : 0); | |
292 | xfs_ichgtime(ip, timeflags); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | olddquot1 = olddquot2 = NULL; | |
297 | udqp = gdqp = NULL; | |
298 | ||
299 | /* | |
300 | * If disk quotas is on, we make sure that the dquots do exist on disk, | |
301 | * before we start any other transactions. Trying to do this later | |
302 | * is messy. We don't care to take a readlock to look at the ids | |
303 | * in inode here, because we can't hold it across the trans_reserve. | |
304 | * If the IDs do change before we take the ilock, we're covered | |
305 | * because the i_*dquot fields will get updated anyway. | |
306 | */ | |
c8ad20ff NS |
307 | if (XFS_IS_QUOTA_ON(mp) && |
308 | (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID))) { | |
1da177e4 LT |
309 | uint qflags = 0; |
310 | ||
c8ad20ff | 311 | if ((mask & XFS_AT_UID) && XFS_IS_UQUOTA_ON(mp)) { |
1da177e4 LT |
312 | uid = vap->va_uid; |
313 | qflags |= XFS_QMOPT_UQUOTA; | |
314 | } else { | |
315 | uid = ip->i_d.di_uid; | |
316 | } | |
c8ad20ff | 317 | if ((mask & XFS_AT_GID) && XFS_IS_GQUOTA_ON(mp)) { |
1da177e4 LT |
318 | gid = vap->va_gid; |
319 | qflags |= XFS_QMOPT_GQUOTA; | |
320 | } else { | |
321 | gid = ip->i_d.di_gid; | |
322 | } | |
c8ad20ff NS |
323 | if ((mask & XFS_AT_PROJID) && XFS_IS_PQUOTA_ON(mp)) { |
324 | projid = vap->va_projid; | |
325 | qflags |= XFS_QMOPT_PQUOTA; | |
326 | } else { | |
327 | projid = ip->i_d.di_projid; | |
328 | } | |
1da177e4 LT |
329 | /* |
330 | * We take a reference when we initialize udqp and gdqp, | |
331 | * so it is important that we never blindly double trip on | |
332 | * the same variable. See xfs_create() for an example. | |
333 | */ | |
334 | ASSERT(udqp == NULL); | |
335 | ASSERT(gdqp == NULL); | |
c8ad20ff NS |
336 | code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, projid, qflags, |
337 | &udqp, &gdqp); | |
1da177e4 LT |
338 | if (code) |
339 | return (code); | |
340 | } | |
341 | ||
342 | /* | |
343 | * For the other attributes, we acquire the inode lock and | |
344 | * first do an error checking pass. | |
345 | */ | |
346 | tp = NULL; | |
347 | lock_flags = XFS_ILOCK_EXCL; | |
5fcbab35 DR |
348 | ASSERT(flags & ATTR_NOLOCK ? flags & ATTR_DMI : 1); |
349 | if (flags & ATTR_NOLOCK) | |
350 | need_iolock = 0; | |
1da177e4 LT |
351 | if (!(mask & XFS_AT_SIZE)) { |
352 | if ((mask != (XFS_AT_CTIME|XFS_AT_ATIME|XFS_AT_MTIME)) || | |
353 | (mp->m_flags & XFS_MOUNT_WSYNC)) { | |
354 | tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); | |
355 | commit_flags = 0; | |
356 | if ((code = xfs_trans_reserve(tp, 0, | |
357 | XFS_ICHANGE_LOG_RES(mp), 0, | |
358 | 0, 0))) { | |
359 | lock_flags = 0; | |
360 | goto error_return; | |
361 | } | |
362 | } | |
363 | } else { | |
364 | if (DM_EVENT_ENABLED (vp->v_vfsp, ip, DM_EVENT_TRUNCATE) && | |
365 | !(flags & ATTR_DMI)) { | |
366 | int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR; | |
367 | code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, vp, | |
368 | vap->va_size, 0, dmflags, NULL); | |
369 | if (code) { | |
370 | lock_flags = 0; | |
371 | goto error_return; | |
372 | } | |
373 | } | |
374 | if (need_iolock) | |
375 | lock_flags |= XFS_IOLOCK_EXCL; | |
376 | } | |
377 | ||
378 | xfs_ilock(ip, lock_flags); | |
379 | ||
380 | /* boolean: are we the file owner? */ | |
381 | file_owner = (current_fsuid(credp) == ip->i_d.di_uid); | |
382 | ||
383 | /* | |
384 | * Change various properties of a file. | |
385 | * Only the owner or users with CAP_FOWNER | |
386 | * capability may do these things. | |
387 | */ | |
388 | if (mask & | |
389 | (XFS_AT_MODE|XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_UID| | |
390 | XFS_AT_GID|XFS_AT_PROJID)) { | |
391 | /* | |
392 | * CAP_FOWNER overrides the following restrictions: | |
393 | * | |
394 | * The user ID of the calling process must be equal | |
395 | * to the file owner ID, except in cases where the | |
396 | * CAP_FSETID capability is applicable. | |
397 | */ | |
398 | if (!file_owner && !capable(CAP_FOWNER)) { | |
399 | code = XFS_ERROR(EPERM); | |
400 | goto error_return; | |
401 | } | |
402 | ||
403 | /* | |
404 | * CAP_FSETID overrides the following restrictions: | |
405 | * | |
406 | * The effective user ID of the calling process shall match | |
407 | * the file owner when setting the set-user-ID and | |
408 | * set-group-ID bits on that file. | |
409 | * | |
410 | * The effective group ID or one of the supplementary group | |
411 | * IDs of the calling process shall match the group owner of | |
412 | * the file when setting the set-group-ID bit on that file | |
413 | */ | |
414 | if (mask & XFS_AT_MODE) { | |
415 | mode_t m = 0; | |
416 | ||
417 | if ((vap->va_mode & S_ISUID) && !file_owner) | |
418 | m |= S_ISUID; | |
419 | if ((vap->va_mode & S_ISGID) && | |
420 | !in_group_p((gid_t)ip->i_d.di_gid)) | |
421 | m |= S_ISGID; | |
422 | #if 0 | |
423 | /* Linux allows this, Irix doesn't. */ | |
0432dab2 | 424 | if ((vap->va_mode & S_ISVTX) && !VN_ISDIR(vp)) |
1da177e4 LT |
425 | m |= S_ISVTX; |
426 | #endif | |
427 | if (m && !capable(CAP_FSETID)) | |
428 | vap->va_mode &= ~m; | |
429 | } | |
430 | } | |
431 | ||
432 | /* | |
433 | * Change file ownership. Must be the owner or privileged. | |
434 | * If the system was configured with the "restricted_chown" | |
435 | * option, the owner is not permitted to give away the file, | |
436 | * and can change the group id only to a group of which he | |
437 | * or she is a member. | |
438 | */ | |
439 | if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) { | |
440 | /* | |
441 | * These IDs could have changed since we last looked at them. | |
442 | * But, we're assured that if the ownership did change | |
443 | * while we didn't have the inode locked, inode's dquot(s) | |
444 | * would have changed also. | |
445 | */ | |
446 | iuid = ip->i_d.di_uid; | |
447 | iprojid = ip->i_d.di_projid; | |
448 | igid = ip->i_d.di_gid; | |
449 | gid = (mask & XFS_AT_GID) ? vap->va_gid : igid; | |
450 | uid = (mask & XFS_AT_UID) ? vap->va_uid : iuid; | |
451 | projid = (mask & XFS_AT_PROJID) ? (xfs_prid_t)vap->va_projid : | |
452 | iprojid; | |
453 | ||
454 | /* | |
455 | * CAP_CHOWN overrides the following restrictions: | |
456 | * | |
457 | * If _POSIX_CHOWN_RESTRICTED is defined, this capability | |
458 | * shall override the restriction that a process cannot | |
459 | * change the user ID of a file it owns and the restriction | |
460 | * that the group ID supplied to the chown() function | |
461 | * shall be equal to either the group ID or one of the | |
462 | * supplementary group IDs of the calling process. | |
1da177e4 LT |
463 | */ |
464 | if (restricted_chown && | |
465 | (iuid != uid || (igid != gid && | |
466 | !in_group_p((gid_t)gid))) && | |
467 | !capable(CAP_CHOWN)) { | |
468 | code = XFS_ERROR(EPERM); | |
469 | goto error_return; | |
470 | } | |
471 | /* | |
c8ad20ff | 472 | * Do a quota reservation only if uid/projid/gid is actually |
1da177e4 LT |
473 | * going to change. |
474 | */ | |
475 | if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) || | |
c8ad20ff | 476 | (XFS_IS_PQUOTA_ON(mp) && iprojid != projid) || |
1da177e4 LT |
477 | (XFS_IS_GQUOTA_ON(mp) && igid != gid)) { |
478 | ASSERT(tp); | |
479 | code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp, | |
480 | capable(CAP_FOWNER) ? | |
481 | XFS_QMOPT_FORCE_RES : 0); | |
482 | if (code) /* out of quota */ | |
483 | goto error_return; | |
484 | } | |
485 | } | |
486 | ||
487 | /* | |
488 | * Truncate file. Must have write permission and not be a directory. | |
489 | */ | |
490 | if (mask & XFS_AT_SIZE) { | |
491 | /* Short circuit the truncate case for zero length files */ | |
492 | if ((vap->va_size == 0) && | |
493 | (ip->i_d.di_size == 0) && (ip->i_d.di_nextents == 0)) { | |
494 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
495 | lock_flags &= ~XFS_ILOCK_EXCL; | |
496 | if (mask & XFS_AT_CTIME) | |
497 | xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
498 | code = 0; | |
499 | goto error_return; | |
500 | } | |
501 | ||
0432dab2 | 502 | if (VN_ISDIR(vp)) { |
1da177e4 LT |
503 | code = XFS_ERROR(EISDIR); |
504 | goto error_return; | |
0432dab2 | 505 | } else if (!VN_ISREG(vp)) { |
1da177e4 LT |
506 | code = XFS_ERROR(EINVAL); |
507 | goto error_return; | |
508 | } | |
509 | /* | |
510 | * Make sure that the dquots are attached to the inode. | |
511 | */ | |
512 | if ((code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED))) | |
513 | goto error_return; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Change file access or modified times. | |
518 | */ | |
519 | if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) { | |
520 | if (!file_owner) { | |
521 | if ((flags & ATTR_UTIME) && | |
522 | !capable(CAP_FOWNER)) { | |
523 | code = XFS_ERROR(EPERM); | |
524 | goto error_return; | |
525 | } | |
526 | } | |
527 | } | |
528 | ||
529 | /* | |
530 | * Change extent size or realtime flag. | |
531 | */ | |
532 | if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) { | |
533 | /* | |
534 | * Can't change extent size if any extents are allocated. | |
535 | */ | |
e94af02a | 536 | if (ip->i_d.di_nextents && (mask & XFS_AT_EXTSIZE) && |
1da177e4 LT |
537 | ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != |
538 | vap->va_extsize) ) { | |
539 | code = XFS_ERROR(EINVAL); /* EFBIG? */ | |
540 | goto error_return; | |
541 | } | |
542 | ||
543 | /* | |
544 | * Can't set extent size unless the file is marked, or | |
545 | * about to be marked as a realtime file. | |
546 | * | |
547 | * This check will be removed when fixed size extents | |
548 | * with buffered data writes is implemented. | |
549 | * | |
550 | */ | |
551 | if ((mask & XFS_AT_EXTSIZE) && | |
552 | ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != | |
553 | vap->va_extsize) && | |
554 | (!((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) || | |
555 | ((mask & XFS_AT_XFLAGS) && | |
556 | (vap->va_xflags & XFS_XFLAG_REALTIME))))) { | |
557 | code = XFS_ERROR(EINVAL); | |
558 | goto error_return; | |
559 | } | |
560 | ||
561 | /* | |
562 | * Can't change realtime flag if any extents are allocated. | |
563 | */ | |
e94af02a ES |
564 | if ((ip->i_d.di_nextents || ip->i_delayed_blks) && |
565 | (mask & XFS_AT_XFLAGS) && | |
1da177e4 LT |
566 | (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != |
567 | (vap->va_xflags & XFS_XFLAG_REALTIME)) { | |
568 | code = XFS_ERROR(EINVAL); /* EFBIG? */ | |
569 | goto error_return; | |
570 | } | |
571 | /* | |
572 | * Extent size must be a multiple of the appropriate block | |
573 | * size, if set at all. | |
574 | */ | |
575 | if ((mask & XFS_AT_EXTSIZE) && vap->va_extsize != 0) { | |
576 | xfs_extlen_t size; | |
577 | ||
578 | if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) || | |
579 | ((mask & XFS_AT_XFLAGS) && | |
580 | (vap->va_xflags & XFS_XFLAG_REALTIME))) { | |
581 | size = mp->m_sb.sb_rextsize << | |
582 | mp->m_sb.sb_blocklog; | |
583 | } else { | |
584 | size = mp->m_sb.sb_blocksize; | |
585 | } | |
586 | if (vap->va_extsize % size) { | |
587 | code = XFS_ERROR(EINVAL); | |
588 | goto error_return; | |
589 | } | |
590 | } | |
591 | /* | |
592 | * If realtime flag is set then must have realtime data. | |
593 | */ | |
594 | if ((mask & XFS_AT_XFLAGS) && | |
595 | (vap->va_xflags & XFS_XFLAG_REALTIME)) { | |
596 | if ((mp->m_sb.sb_rblocks == 0) || | |
597 | (mp->m_sb.sb_rextsize == 0) || | |
598 | (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) { | |
599 | code = XFS_ERROR(EINVAL); | |
600 | goto error_return; | |
601 | } | |
602 | } | |
603 | ||
604 | /* | |
605 | * Can't modify an immutable/append-only file unless | |
606 | * we have appropriate permission. | |
607 | */ | |
608 | if ((mask & XFS_AT_XFLAGS) && | |
609 | (ip->i_d.di_flags & | |
610 | (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) || | |
611 | (vap->va_xflags & | |
612 | (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) && | |
613 | !capable(CAP_LINUX_IMMUTABLE)) { | |
614 | code = XFS_ERROR(EPERM); | |
615 | goto error_return; | |
616 | } | |
617 | } | |
618 | ||
619 | /* | |
620 | * Now we can make the changes. Before we join the inode | |
621 | * to the transaction, if XFS_AT_SIZE is set then take care of | |
622 | * the part of the truncation that must be done without the | |
623 | * inode lock. This needs to be done before joining the inode | |
624 | * to the transaction, because the inode cannot be unlocked | |
625 | * once it is a part of the transaction. | |
626 | */ | |
627 | if (mask & XFS_AT_SIZE) { | |
628 | code = 0; | |
374e2ac3 ES |
629 | if ((vap->va_size > ip->i_d.di_size) && |
630 | (flags & ATTR_NOSIZETOK) == 0) { | |
1da177e4 | 631 | code = xfs_igrow_start(ip, vap->va_size, credp); |
374e2ac3 | 632 | } |
1da177e4 LT |
633 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
634 | if (!code) | |
635 | code = xfs_itruncate_data(ip, vap->va_size); | |
636 | if (code) { | |
637 | ASSERT(tp == NULL); | |
638 | lock_flags &= ~XFS_ILOCK_EXCL; | |
639 | ASSERT(lock_flags == XFS_IOLOCK_EXCL); | |
640 | goto error_return; | |
641 | } | |
642 | tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); | |
643 | if ((code = xfs_trans_reserve(tp, 0, | |
644 | XFS_ITRUNCATE_LOG_RES(mp), 0, | |
645 | XFS_TRANS_PERM_LOG_RES, | |
646 | XFS_ITRUNCATE_LOG_COUNT))) { | |
647 | xfs_trans_cancel(tp, 0); | |
648 | if (need_iolock) | |
649 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
650 | return code; | |
651 | } | |
652 | commit_flags = XFS_TRANS_RELEASE_LOG_RES; | |
653 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
654 | } | |
655 | ||
656 | if (tp) { | |
657 | xfs_trans_ijoin(tp, ip, lock_flags); | |
658 | xfs_trans_ihold(tp, ip); | |
659 | } | |
660 | ||
661 | /* determine whether mandatory locking mode changes */ | |
662 | mandlock_before = MANDLOCK(vp, ip->i_d.di_mode); | |
663 | ||
664 | /* | |
665 | * Truncate file. Must have write permission and not be a directory. | |
666 | */ | |
667 | if (mask & XFS_AT_SIZE) { | |
668 | if (vap->va_size > ip->i_d.di_size) { | |
669 | xfs_igrow_finish(tp, ip, vap->va_size, | |
670 | !(flags & ATTR_DMI)); | |
671 | } else if ((vap->va_size <= ip->i_d.di_size) || | |
672 | ((vap->va_size == 0) && ip->i_d.di_nextents)) { | |
673 | /* | |
674 | * signal a sync transaction unless | |
675 | * we're truncating an already unlinked | |
676 | * file on a wsync filesystem | |
677 | */ | |
678 | code = xfs_itruncate_finish(&tp, ip, | |
679 | (xfs_fsize_t)vap->va_size, | |
680 | XFS_DATA_FORK, | |
681 | ((ip->i_d.di_nlink != 0 || | |
682 | !(mp->m_flags & XFS_MOUNT_WSYNC)) | |
683 | ? 1 : 0)); | |
684 | if (code) { | |
685 | goto abort_return; | |
686 | } | |
687 | } | |
688 | /* | |
689 | * Have to do this even if the file's size doesn't change. | |
690 | */ | |
691 | timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
692 | } | |
693 | ||
694 | /* | |
695 | * Change file access modes. | |
696 | */ | |
697 | if (mask & XFS_AT_MODE) { | |
698 | ip->i_d.di_mode &= S_IFMT; | |
699 | ip->i_d.di_mode |= vap->va_mode & ~S_IFMT; | |
700 | ||
701 | xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); | |
702 | timeflags |= XFS_ICHGTIME_CHG; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Change file ownership. Must be the owner or privileged. | |
707 | * If the system was configured with the "restricted_chown" | |
708 | * option, the owner is not permitted to give away the file, | |
709 | * and can change the group id only to a group of which he | |
710 | * or she is a member. | |
711 | */ | |
712 | if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) { | |
713 | /* | |
714 | * CAP_FSETID overrides the following restrictions: | |
715 | * | |
716 | * The set-user-ID and set-group-ID bits of a file will be | |
717 | * cleared upon successful return from chown() | |
718 | */ | |
719 | if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && | |
720 | !capable(CAP_FSETID)) { | |
721 | ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); | |
722 | } | |
723 | ||
724 | /* | |
725 | * Change the ownerships and register quota modifications | |
726 | * in the transaction. | |
727 | */ | |
728 | if (iuid != uid) { | |
729 | if (XFS_IS_UQUOTA_ON(mp)) { | |
730 | ASSERT(mask & XFS_AT_UID); | |
731 | ASSERT(udqp); | |
732 | olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip, | |
733 | &ip->i_udquot, udqp); | |
734 | } | |
735 | ip->i_d.di_uid = uid; | |
736 | } | |
737 | if (igid != gid) { | |
738 | if (XFS_IS_GQUOTA_ON(mp)) { | |
c8ad20ff | 739 | ASSERT(!XFS_IS_PQUOTA_ON(mp)); |
1da177e4 LT |
740 | ASSERT(mask & XFS_AT_GID); |
741 | ASSERT(gdqp); | |
742 | olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip, | |
743 | &ip->i_gdquot, gdqp); | |
744 | } | |
745 | ip->i_d.di_gid = gid; | |
746 | } | |
747 | if (iprojid != projid) { | |
c8ad20ff NS |
748 | if (XFS_IS_PQUOTA_ON(mp)) { |
749 | ASSERT(!XFS_IS_GQUOTA_ON(mp)); | |
750 | ASSERT(mask & XFS_AT_PROJID); | |
751 | ASSERT(gdqp); | |
752 | olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip, | |
753 | &ip->i_gdquot, gdqp); | |
754 | } | |
1da177e4 LT |
755 | ip->i_d.di_projid = projid; |
756 | /* | |
757 | * We may have to rev the inode as well as | |
758 | * the superblock version number since projids didn't | |
759 | * exist before DINODE_VERSION_2 and SB_VERSION_NLINK. | |
760 | */ | |
761 | if (ip->i_d.di_version == XFS_DINODE_VERSION_1) | |
762 | xfs_bump_ino_vers2(tp, ip); | |
763 | } | |
764 | ||
765 | xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); | |
766 | timeflags |= XFS_ICHGTIME_CHG; | |
767 | } | |
768 | ||
769 | ||
770 | /* | |
771 | * Change file access or modified times. | |
772 | */ | |
773 | if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) { | |
774 | if (mask & XFS_AT_ATIME) { | |
775 | ip->i_d.di_atime.t_sec = vap->va_atime.tv_sec; | |
776 | ip->i_d.di_atime.t_nsec = vap->va_atime.tv_nsec; | |
777 | ip->i_update_core = 1; | |
778 | timeflags &= ~XFS_ICHGTIME_ACC; | |
779 | } | |
780 | if (mask & XFS_AT_MTIME) { | |
781 | ip->i_d.di_mtime.t_sec = vap->va_mtime.tv_sec; | |
782 | ip->i_d.di_mtime.t_nsec = vap->va_mtime.tv_nsec; | |
783 | timeflags &= ~XFS_ICHGTIME_MOD; | |
784 | timeflags |= XFS_ICHGTIME_CHG; | |
785 | } | |
786 | if (tp && (flags & ATTR_UTIME)) | |
787 | xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); | |
788 | } | |
789 | ||
790 | /* | |
791 | * Change XFS-added attributes. | |
792 | */ | |
793 | if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) { | |
794 | if (mask & XFS_AT_EXTSIZE) { | |
795 | /* | |
796 | * Converting bytes to fs blocks. | |
797 | */ | |
798 | ip->i_d.di_extsize = vap->va_extsize >> | |
799 | mp->m_sb.sb_blocklog; | |
800 | } | |
801 | if (mask & XFS_AT_XFLAGS) { | |
802 | uint di_flags; | |
803 | ||
804 | /* can't set PREALLOC this way, just preserve it */ | |
805 | di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC); | |
806 | if (vap->va_xflags & XFS_XFLAG_IMMUTABLE) | |
807 | di_flags |= XFS_DIFLAG_IMMUTABLE; | |
808 | if (vap->va_xflags & XFS_XFLAG_APPEND) | |
809 | di_flags |= XFS_DIFLAG_APPEND; | |
810 | if (vap->va_xflags & XFS_XFLAG_SYNC) | |
811 | di_flags |= XFS_DIFLAG_SYNC; | |
812 | if (vap->va_xflags & XFS_XFLAG_NOATIME) | |
813 | di_flags |= XFS_DIFLAG_NOATIME; | |
814 | if (vap->va_xflags & XFS_XFLAG_NODUMP) | |
815 | di_flags |= XFS_DIFLAG_NODUMP; | |
365ca83d NS |
816 | if (vap->va_xflags & XFS_XFLAG_PROJINHERIT) |
817 | di_flags |= XFS_DIFLAG_PROJINHERIT; | |
1da177e4 LT |
818 | if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) { |
819 | if (vap->va_xflags & XFS_XFLAG_RTINHERIT) | |
820 | di_flags |= XFS_DIFLAG_RTINHERIT; | |
821 | if (vap->va_xflags & XFS_XFLAG_NOSYMLINKS) | |
822 | di_flags |= XFS_DIFLAG_NOSYMLINKS; | |
823 | } else { | |
824 | if (vap->va_xflags & XFS_XFLAG_REALTIME) { | |
825 | di_flags |= XFS_DIFLAG_REALTIME; | |
826 | ip->i_iocore.io_flags |= XFS_IOCORE_RT; | |
827 | } else { | |
828 | ip->i_iocore.io_flags &= ~XFS_IOCORE_RT; | |
829 | } | |
830 | } | |
831 | ip->i_d.di_flags = di_flags; | |
832 | } | |
833 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
834 | timeflags |= XFS_ICHGTIME_CHG; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Change file inode change time only if XFS_AT_CTIME set | |
839 | * AND we have been called by a DMI function. | |
840 | */ | |
841 | ||
842 | if ( (flags & ATTR_DMI) && (mask & XFS_AT_CTIME) ) { | |
843 | ip->i_d.di_ctime.t_sec = vap->va_ctime.tv_sec; | |
844 | ip->i_d.di_ctime.t_nsec = vap->va_ctime.tv_nsec; | |
845 | ip->i_update_core = 1; | |
846 | timeflags &= ~XFS_ICHGTIME_CHG; | |
847 | } | |
848 | ||
849 | /* | |
850 | * Send out timestamp changes that need to be set to the | |
851 | * current time. Not done when called by a DMI function. | |
852 | */ | |
853 | if (timeflags && !(flags & ATTR_DMI)) | |
854 | xfs_ichgtime(ip, timeflags); | |
855 | ||
856 | XFS_STATS_INC(xs_ig_attrchg); | |
857 | ||
858 | /* | |
859 | * If this is a synchronous mount, make sure that the | |
860 | * transaction goes to disk before returning to the user. | |
861 | * This is slightly sub-optimal in that truncates require | |
862 | * two sync transactions instead of one for wsync filesytems. | |
863 | * One for the truncate and one for the timestamps since we | |
864 | * don't want to change the timestamps unless we're sure the | |
865 | * truncate worked. Truncates are less than 1% of the laddis | |
866 | * mix so this probably isn't worth the trouble to optimize. | |
867 | */ | |
868 | code = 0; | |
869 | if (tp) { | |
870 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
871 | xfs_trans_set_sync(tp); | |
872 | ||
873 | code = xfs_trans_commit(tp, commit_flags, NULL); | |
874 | } | |
875 | ||
876 | /* | |
877 | * If the (regular) file's mandatory locking mode changed, then | |
878 | * notify the vnode. We do this under the inode lock to prevent | |
879 | * racing calls to vop_vnode_change. | |
880 | */ | |
881 | mandlock_after = MANDLOCK(vp, ip->i_d.di_mode); | |
882 | if (mandlock_before != mandlock_after) { | |
883 | VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_ENF_LOCKING, | |
884 | mandlock_after); | |
885 | } | |
886 | ||
887 | xfs_iunlock(ip, lock_flags); | |
888 | ||
889 | /* | |
890 | * Release any dquot(s) the inode had kept before chown. | |
891 | */ | |
892 | XFS_QM_DQRELE(mp, olddquot1); | |
893 | XFS_QM_DQRELE(mp, olddquot2); | |
894 | XFS_QM_DQRELE(mp, udqp); | |
895 | XFS_QM_DQRELE(mp, gdqp); | |
896 | ||
897 | if (code) { | |
898 | return code; | |
899 | } | |
900 | ||
901 | if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_ATTRIBUTE) && | |
902 | !(flags & ATTR_DMI)) { | |
903 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, vp, DM_RIGHT_NULL, | |
904 | NULL, DM_RIGHT_NULL, NULL, NULL, | |
905 | 0, 0, AT_DELAY_FLAG(flags)); | |
906 | } | |
907 | return 0; | |
908 | ||
909 | abort_return: | |
910 | commit_flags |= XFS_TRANS_ABORT; | |
911 | /* FALLTHROUGH */ | |
912 | error_return: | |
913 | XFS_QM_DQRELE(mp, udqp); | |
914 | XFS_QM_DQRELE(mp, gdqp); | |
915 | if (tp) { | |
916 | xfs_trans_cancel(tp, commit_flags); | |
917 | } | |
918 | if (lock_flags != 0) { | |
919 | xfs_iunlock(ip, lock_flags); | |
920 | } | |
921 | return code; | |
922 | } | |
923 | ||
924 | ||
925 | /* | |
926 | * xfs_access | |
927 | * Null conversion from vnode mode bits to inode mode bits, as in efs. | |
928 | */ | |
929 | STATIC int | |
930 | xfs_access( | |
931 | bhv_desc_t *bdp, | |
932 | int mode, | |
933 | cred_t *credp) | |
934 | { | |
935 | xfs_inode_t *ip; | |
936 | int error; | |
937 | ||
938 | vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, | |
939 | (inst_t *)__return_address); | |
940 | ||
941 | ip = XFS_BHVTOI(bdp); | |
942 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
943 | error = xfs_iaccess(ip, mode, credp); | |
944 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
945 | return error; | |
946 | } | |
947 | ||
948 | ||
949 | /* | |
950 | * xfs_readlink | |
951 | * | |
952 | */ | |
953 | STATIC int | |
954 | xfs_readlink( | |
955 | bhv_desc_t *bdp, | |
956 | uio_t *uiop, | |
957 | int ioflags, | |
958 | cred_t *credp) | |
959 | { | |
960 | xfs_inode_t *ip; | |
961 | int count; | |
962 | xfs_off_t offset; | |
963 | int pathlen; | |
964 | vnode_t *vp; | |
965 | int error = 0; | |
966 | xfs_mount_t *mp; | |
967 | int nmaps; | |
968 | xfs_bmbt_irec_t mval[SYMLINK_MAPS]; | |
969 | xfs_daddr_t d; | |
970 | int byte_cnt; | |
971 | int n; | |
972 | xfs_buf_t *bp; | |
973 | ||
974 | vp = BHV_TO_VNODE(bdp); | |
975 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
976 | ||
977 | ip = XFS_BHVTOI(bdp); | |
978 | mp = ip->i_mount; | |
979 | ||
980 | if (XFS_FORCED_SHUTDOWN(mp)) | |
981 | return XFS_ERROR(EIO); | |
982 | ||
983 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
984 | ||
985 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK); | |
986 | ||
987 | offset = uiop->uio_offset; | |
988 | count = uiop->uio_resid; | |
989 | ||
990 | if (offset < 0) { | |
991 | error = XFS_ERROR(EINVAL); | |
992 | goto error_return; | |
993 | } | |
994 | if (count <= 0) { | |
995 | error = 0; | |
996 | goto error_return; | |
997 | } | |
998 | ||
999 | if (!(ioflags & IO_INVIS)) { | |
1000 | xfs_ichgtime(ip, XFS_ICHGTIME_ACC); | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * See if the symlink is stored inline. | |
1005 | */ | |
1006 | pathlen = (int)ip->i_d.di_size; | |
1007 | ||
1008 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
1009 | error = uio_read(ip->i_df.if_u1.if_data, pathlen, uiop); | |
1010 | } | |
1011 | else { | |
1012 | /* | |
1013 | * Symlink not inline. Call bmap to get it in. | |
1014 | */ | |
1015 | nmaps = SYMLINK_MAPS; | |
1016 | ||
1017 | error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), | |
1018 | 0, NULL, 0, mval, &nmaps, NULL); | |
1019 | ||
1020 | if (error) { | |
1021 | goto error_return; | |
1022 | } | |
1023 | ||
1024 | for (n = 0; n < nmaps; n++) { | |
1025 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
1026 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
1027 | bp = xfs_buf_read(mp->m_ddev_targp, d, | |
1028 | BTOBB(byte_cnt), 0); | |
1029 | error = XFS_BUF_GETERROR(bp); | |
1030 | if (error) { | |
1031 | xfs_ioerror_alert("xfs_readlink", | |
1032 | ip->i_mount, bp, XFS_BUF_ADDR(bp)); | |
1033 | xfs_buf_relse(bp); | |
1034 | goto error_return; | |
1035 | } | |
1036 | if (pathlen < byte_cnt) | |
1037 | byte_cnt = pathlen; | |
1038 | pathlen -= byte_cnt; | |
1039 | ||
1040 | error = uio_read(XFS_BUF_PTR(bp), byte_cnt, uiop); | |
1041 | xfs_buf_relse (bp); | |
1042 | } | |
1043 | ||
1044 | } | |
1045 | ||
1046 | ||
1047 | error_return: | |
1048 | ||
1049 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1050 | ||
1051 | return error; | |
1052 | } | |
1053 | ||
1054 | ||
1055 | /* | |
1056 | * xfs_fsync | |
1057 | * | |
1058 | * This is called to sync the inode and its data out to disk. | |
1059 | * We need to hold the I/O lock while flushing the data, and | |
1060 | * the inode lock while flushing the inode. The inode lock CANNOT | |
1061 | * be held while flushing the data, so acquire after we're done | |
1062 | * with that. | |
1063 | */ | |
1064 | STATIC int | |
1065 | xfs_fsync( | |
1066 | bhv_desc_t *bdp, | |
1067 | int flag, | |
1068 | cred_t *credp, | |
1069 | xfs_off_t start, | |
1070 | xfs_off_t stop) | |
1071 | { | |
1072 | xfs_inode_t *ip; | |
1073 | xfs_trans_t *tp; | |
1074 | int error; | |
f538d4da | 1075 | int log_flushed = 0, changed = 1; |
1da177e4 LT |
1076 | |
1077 | vn_trace_entry(BHV_TO_VNODE(bdp), | |
1078 | __FUNCTION__, (inst_t *)__return_address); | |
1079 | ||
1080 | ip = XFS_BHVTOI(bdp); | |
1081 | ||
1082 | ASSERT(start >= 0 && stop >= -1); | |
1083 | ||
1084 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
1085 | return XFS_ERROR(EIO); | |
1086 | ||
1087 | /* | |
1088 | * We always need to make sure that the required inode state | |
1089 | * is safe on disk. The vnode might be clean but because | |
1090 | * of committed transactions that haven't hit the disk yet. | |
1091 | * Likewise, there could be unflushed non-transactional | |
1092 | * changes to the inode core that have to go to disk. | |
1093 | * | |
1094 | * The following code depends on one assumption: that | |
1095 | * any transaction that changes an inode logs the core | |
1096 | * because it has to change some field in the inode core | |
1097 | * (typically nextents or nblocks). That assumption | |
1098 | * implies that any transactions against an inode will | |
1099 | * catch any non-transactional updates. If inode-altering | |
1100 | * transactions exist that violate this assumption, the | |
1101 | * code breaks. Right now, it figures that if the involved | |
1102 | * update_* field is clear and the inode is unpinned, the | |
1103 | * inode is clean. Either it's been flushed or it's been | |
1104 | * committed and the commit has hit the disk unpinning the inode. | |
1105 | * (Note that xfs_inode_item_format() called at commit clears | |
1106 | * the update_* fields.) | |
1107 | */ | |
1108 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
1109 | ||
1110 | /* If we are flushing data then we care about update_size | |
1111 | * being set, otherwise we care about update_core | |
1112 | */ | |
1113 | if ((flag & FSYNC_DATA) ? | |
1114 | (ip->i_update_size == 0) : | |
1115 | (ip->i_update_core == 0)) { | |
1116 | /* | |
1117 | * Timestamps/size haven't changed since last inode | |
1118 | * flush or inode transaction commit. That means | |
1119 | * either nothing got written or a transaction | |
1120 | * committed which caught the updates. If the | |
1121 | * latter happened and the transaction hasn't | |
1122 | * hit the disk yet, the inode will be still | |
1123 | * be pinned. If it is, force the log. | |
1124 | */ | |
1125 | ||
1126 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1127 | ||
1128 | if (xfs_ipincount(ip)) { | |
f538d4da | 1129 | _xfs_log_force(ip->i_mount, (xfs_lsn_t)0, |
1da177e4 LT |
1130 | XFS_LOG_FORCE | |
1131 | ((flag & FSYNC_WAIT) | |
f538d4da CH |
1132 | ? XFS_LOG_SYNC : 0), |
1133 | &log_flushed); | |
1134 | } else { | |
1135 | /* | |
1136 | * If the inode is not pinned and nothing | |
1137 | * has changed we don't need to flush the | |
1138 | * cache. | |
1139 | */ | |
1140 | changed = 0; | |
1da177e4 LT |
1141 | } |
1142 | error = 0; | |
1143 | } else { | |
1144 | /* | |
1145 | * Kick off a transaction to log the inode | |
1146 | * core to get the updates. Make it | |
1147 | * sync if FSYNC_WAIT is passed in (which | |
1148 | * is done by everybody but specfs). The | |
1149 | * sync transaction will also force the log. | |
1150 | */ | |
1151 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1152 | tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS); | |
1153 | if ((error = xfs_trans_reserve(tp, 0, | |
1154 | XFS_FSYNC_TS_LOG_RES(ip->i_mount), | |
1155 | 0, 0, 0))) { | |
1156 | xfs_trans_cancel(tp, 0); | |
1157 | return error; | |
1158 | } | |
1159 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1160 | ||
1161 | /* | |
1162 | * Note - it's possible that we might have pushed | |
1163 | * ourselves out of the way during trans_reserve | |
1164 | * which would flush the inode. But there's no | |
1165 | * guarantee that the inode buffer has actually | |
1166 | * gone out yet (it's delwri). Plus the buffer | |
1167 | * could be pinned anyway if it's part of an | |
1168 | * inode in another recent transaction. So we | |
1169 | * play it safe and fire off the transaction anyway. | |
1170 | */ | |
1171 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
1172 | xfs_trans_ihold(tp, ip); | |
1173 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1174 | if (flag & FSYNC_WAIT) | |
1175 | xfs_trans_set_sync(tp); | |
f538d4da | 1176 | error = _xfs_trans_commit(tp, 0, NULL, &log_flushed); |
1da177e4 LT |
1177 | |
1178 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1179 | } | |
f538d4da CH |
1180 | |
1181 | if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) { | |
1182 | /* | |
1183 | * If the log write didn't issue an ordered tag we need | |
1184 | * to flush the disk cache for the data device now. | |
1185 | */ | |
1186 | if (!log_flushed) | |
1187 | xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp); | |
1188 | ||
1189 | /* | |
1190 | * If this inode is on the RT dev we need to flush that | |
1191 | * cache aswell. | |
1192 | */ | |
1193 | if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) | |
1194 | xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp); | |
1195 | } | |
1196 | ||
1da177e4 LT |
1197 | return error; |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * This is called by xfs_inactive to free any blocks beyond eof, | |
1202 | * when the link count isn't zero. | |
1203 | */ | |
1204 | STATIC int | |
1205 | xfs_inactive_free_eofblocks( | |
1206 | xfs_mount_t *mp, | |
1207 | xfs_inode_t *ip) | |
1208 | { | |
1209 | xfs_trans_t *tp; | |
1210 | int error; | |
1211 | xfs_fileoff_t end_fsb; | |
1212 | xfs_fileoff_t last_fsb; | |
1213 | xfs_filblks_t map_len; | |
1214 | int nimaps; | |
1215 | xfs_bmbt_irec_t imap; | |
1216 | ||
1217 | /* | |
1218 | * Figure out if there are any blocks beyond the end | |
1219 | * of the file. If not, then there is nothing to do. | |
1220 | */ | |
1221 | end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_d.di_size)); | |
1222 | last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
1223 | map_len = last_fsb - end_fsb; | |
1224 | if (map_len <= 0) | |
1225 | return (0); | |
1226 | ||
1227 | nimaps = 1; | |
1228 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
1229 | error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0, | |
1230 | NULL, 0, &imap, &nimaps, NULL); | |
1231 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1232 | ||
1233 | if (!error && (nimaps != 0) && | |
1234 | (imap.br_startblock != HOLESTARTBLOCK)) { | |
1235 | /* | |
1236 | * Attach the dquots to the inode up front. | |
1237 | */ | |
1238 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
1239 | return (error); | |
1240 | ||
1241 | /* | |
1242 | * There are blocks after the end of file. | |
1243 | * Free them up now by truncating the file to | |
1244 | * its current size. | |
1245 | */ | |
1246 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1247 | ||
1248 | /* | |
1249 | * Do the xfs_itruncate_start() call before | |
1250 | * reserving any log space because | |
1251 | * itruncate_start will call into the buffer | |
1252 | * cache and we can't | |
1253 | * do that within a transaction. | |
1254 | */ | |
1255 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1256 | xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, | |
1257 | ip->i_d.di_size); | |
1258 | ||
1259 | error = xfs_trans_reserve(tp, 0, | |
1260 | XFS_ITRUNCATE_LOG_RES(mp), | |
1261 | 0, XFS_TRANS_PERM_LOG_RES, | |
1262 | XFS_ITRUNCATE_LOG_COUNT); | |
1263 | if (error) { | |
1264 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1265 | xfs_trans_cancel(tp, 0); | |
1266 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1267 | return (error); | |
1268 | } | |
1269 | ||
1270 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1271 | xfs_trans_ijoin(tp, ip, | |
1272 | XFS_IOLOCK_EXCL | | |
1273 | XFS_ILOCK_EXCL); | |
1274 | xfs_trans_ihold(tp, ip); | |
1275 | ||
1276 | error = xfs_itruncate_finish(&tp, ip, | |
1277 | ip->i_d.di_size, | |
1278 | XFS_DATA_FORK, | |
1279 | 0); | |
1280 | /* | |
1281 | * If we get an error at this point we | |
1282 | * simply don't bother truncating the file. | |
1283 | */ | |
1284 | if (error) { | |
1285 | xfs_trans_cancel(tp, | |
1286 | (XFS_TRANS_RELEASE_LOG_RES | | |
1287 | XFS_TRANS_ABORT)); | |
1288 | } else { | |
1289 | error = xfs_trans_commit(tp, | |
1290 | XFS_TRANS_RELEASE_LOG_RES, | |
1291 | NULL); | |
1292 | } | |
1293 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1294 | } | |
1295 | return (error); | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * Free a symlink that has blocks associated with it. | |
1300 | */ | |
1301 | STATIC int | |
1302 | xfs_inactive_symlink_rmt( | |
1303 | xfs_inode_t *ip, | |
1304 | xfs_trans_t **tpp) | |
1305 | { | |
1306 | xfs_buf_t *bp; | |
1307 | int committed; | |
1308 | int done; | |
1309 | int error; | |
1310 | xfs_fsblock_t first_block; | |
1311 | xfs_bmap_free_t free_list; | |
1312 | int i; | |
1313 | xfs_mount_t *mp; | |
1314 | xfs_bmbt_irec_t mval[SYMLINK_MAPS]; | |
1315 | int nmaps; | |
1316 | xfs_trans_t *ntp; | |
1317 | int size; | |
1318 | xfs_trans_t *tp; | |
1319 | ||
1320 | tp = *tpp; | |
1321 | mp = ip->i_mount; | |
1322 | ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip)); | |
1323 | /* | |
1324 | * We're freeing a symlink that has some | |
1325 | * blocks allocated to it. Free the | |
1326 | * blocks here. We know that we've got | |
1327 | * either 1 or 2 extents and that we can | |
1328 | * free them all in one bunmapi call. | |
1329 | */ | |
1330 | ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); | |
1331 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
1332 | XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { | |
1333 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1334 | xfs_trans_cancel(tp, 0); | |
1335 | *tpp = NULL; | |
1336 | return error; | |
1337 | } | |
1338 | /* | |
1339 | * Lock the inode, fix the size, and join it to the transaction. | |
1340 | * Hold it so in the normal path, we still have it locked for | |
1341 | * the second transaction. In the error paths we need it | |
1342 | * held so the cancel won't rele it, see below. | |
1343 | */ | |
1344 | xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1345 | size = (int)ip->i_d.di_size; | |
1346 | ip->i_d.di_size = 0; | |
1347 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1348 | xfs_trans_ihold(tp, ip); | |
1349 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1350 | /* | |
1351 | * Find the block(s) so we can inval and unmap them. | |
1352 | */ | |
1353 | done = 0; | |
1354 | XFS_BMAP_INIT(&free_list, &first_block); | |
1355 | nmaps = sizeof(mval) / sizeof(mval[0]); | |
1356 | if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size), | |
1357 | XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps, | |
1358 | &free_list))) | |
1359 | goto error0; | |
1360 | /* | |
1361 | * Invalidate the block(s). | |
1362 | */ | |
1363 | for (i = 0; i < nmaps; i++) { | |
1364 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, | |
1365 | XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), | |
1366 | XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); | |
1367 | xfs_trans_binval(tp, bp); | |
1368 | } | |
1369 | /* | |
1370 | * Unmap the dead block(s) to the free_list. | |
1371 | */ | |
1372 | if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, | |
1373 | &first_block, &free_list, &done))) | |
1374 | goto error1; | |
1375 | ASSERT(done); | |
1376 | /* | |
1377 | * Commit the first transaction. This logs the EFI and the inode. | |
1378 | */ | |
1379 | if ((error = xfs_bmap_finish(&tp, &free_list, first_block, &committed))) | |
1380 | goto error1; | |
1381 | /* | |
1382 | * The transaction must have been committed, since there were | |
1383 | * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. | |
1384 | * The new tp has the extent freeing and EFDs. | |
1385 | */ | |
1386 | ASSERT(committed); | |
1387 | /* | |
1388 | * The first xact was committed, so add the inode to the new one. | |
1389 | * Mark it dirty so it will be logged and moved forward in the log as | |
1390 | * part of every commit. | |
1391 | */ | |
1392 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1393 | xfs_trans_ihold(tp, ip); | |
1394 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1395 | /* | |
1396 | * Get a new, empty transaction to return to our caller. | |
1397 | */ | |
1398 | ntp = xfs_trans_dup(tp); | |
1399 | /* | |
1400 | * Commit the transaction containing extent freeing and EFD's. | |
1401 | * If we get an error on the commit here or on the reserve below, | |
1402 | * we need to unlock the inode since the new transaction doesn't | |
1403 | * have the inode attached. | |
1404 | */ | |
1405 | error = xfs_trans_commit(tp, 0, NULL); | |
1406 | tp = ntp; | |
1407 | if (error) { | |
1408 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1409 | goto error0; | |
1410 | } | |
1411 | /* | |
1412 | * Remove the memory for extent descriptions (just bookkeeping). | |
1413 | */ | |
1414 | if (ip->i_df.if_bytes) | |
1415 | xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); | |
1416 | ASSERT(ip->i_df.if_bytes == 0); | |
1417 | /* | |
1418 | * Put an itruncate log reservation in the new transaction | |
1419 | * for our caller. | |
1420 | */ | |
1421 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
1422 | XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { | |
1423 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1424 | goto error0; | |
1425 | } | |
1426 | /* | |
1427 | * Return with the inode locked but not joined to the transaction. | |
1428 | */ | |
1429 | *tpp = tp; | |
1430 | return 0; | |
1431 | ||
1432 | error1: | |
1433 | xfs_bmap_cancel(&free_list); | |
1434 | error0: | |
1435 | /* | |
1436 | * Have to come here with the inode locked and either | |
1437 | * (held and in the transaction) or (not in the transaction). | |
1438 | * If the inode isn't held then cancel would iput it, but | |
1439 | * that's wrong since this is inactive and the vnode ref | |
1440 | * count is 0 already. | |
1441 | * Cancel won't do anything to the inode if held, but it still | |
1442 | * needs to be locked until the cancel is done, if it was | |
1443 | * joined to the transaction. | |
1444 | */ | |
1445 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1446 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1447 | *tpp = NULL; | |
1448 | return error; | |
1449 | ||
1450 | } | |
1451 | ||
1452 | STATIC int | |
1453 | xfs_inactive_symlink_local( | |
1454 | xfs_inode_t *ip, | |
1455 | xfs_trans_t **tpp) | |
1456 | { | |
1457 | int error; | |
1458 | ||
1459 | ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip)); | |
1460 | /* | |
1461 | * We're freeing a symlink which fit into | |
1462 | * the inode. Just free the memory used | |
1463 | * to hold the old symlink. | |
1464 | */ | |
1465 | error = xfs_trans_reserve(*tpp, 0, | |
1466 | XFS_ITRUNCATE_LOG_RES(ip->i_mount), | |
1467 | 0, XFS_TRANS_PERM_LOG_RES, | |
1468 | XFS_ITRUNCATE_LOG_COUNT); | |
1469 | ||
1470 | if (error) { | |
1471 | xfs_trans_cancel(*tpp, 0); | |
1472 | *tpp = NULL; | |
1473 | return (error); | |
1474 | } | |
1475 | xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1476 | ||
1477 | /* | |
1478 | * Zero length symlinks _can_ exist. | |
1479 | */ | |
1480 | if (ip->i_df.if_bytes > 0) { | |
1481 | xfs_idata_realloc(ip, | |
1482 | -(ip->i_df.if_bytes), | |
1483 | XFS_DATA_FORK); | |
1484 | ASSERT(ip->i_df.if_bytes == 0); | |
1485 | } | |
1486 | return (0); | |
1487 | } | |
1488 | ||
1489 | /* | |
1490 | * | |
1491 | */ | |
1492 | STATIC int | |
1493 | xfs_inactive_attrs( | |
1494 | xfs_inode_t *ip, | |
1495 | xfs_trans_t **tpp) | |
1496 | { | |
1497 | xfs_trans_t *tp; | |
1498 | int error; | |
1499 | xfs_mount_t *mp; | |
1500 | ||
1501 | ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE)); | |
1502 | tp = *tpp; | |
1503 | mp = ip->i_mount; | |
1504 | ASSERT(ip->i_d.di_forkoff != 0); | |
1505 | xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
1506 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1507 | ||
1508 | error = xfs_attr_inactive(ip); | |
1509 | if (error) { | |
1510 | *tpp = NULL; | |
1511 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1512 | return (error); /* goto out*/ | |
1513 | } | |
1514 | ||
1515 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1516 | error = xfs_trans_reserve(tp, 0, | |
1517 | XFS_IFREE_LOG_RES(mp), | |
1518 | 0, XFS_TRANS_PERM_LOG_RES, | |
1519 | XFS_INACTIVE_LOG_COUNT); | |
1520 | if (error) { | |
1521 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1522 | xfs_trans_cancel(tp, 0); | |
1523 | *tpp = NULL; | |
1524 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1525 | return (error); | |
1526 | } | |
1527 | ||
1528 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1529 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1530 | xfs_trans_ihold(tp, ip); | |
1531 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
1532 | ||
1533 | ASSERT(ip->i_d.di_anextents == 0); | |
1534 | ||
1535 | *tpp = tp; | |
1536 | return (0); | |
1537 | } | |
1538 | ||
1539 | STATIC int | |
1540 | xfs_release( | |
1541 | bhv_desc_t *bdp) | |
1542 | { | |
1543 | xfs_inode_t *ip; | |
1544 | vnode_t *vp; | |
1545 | xfs_mount_t *mp; | |
1546 | int error; | |
1547 | ||
1548 | vp = BHV_TO_VNODE(bdp); | |
1549 | ip = XFS_BHVTOI(bdp); | |
1550 | ||
0432dab2 | 1551 | if (!VN_ISREG(vp) || (ip->i_d.di_mode == 0)) { |
1da177e4 LT |
1552 | return 0; |
1553 | } | |
1554 | ||
1555 | /* If this is a read-only mount, don't do this (would generate I/O) */ | |
1556 | if (vp->v_vfsp->vfs_flag & VFS_RDONLY) | |
1557 | return 0; | |
1558 | ||
1559 | #ifdef HAVE_REFCACHE | |
1560 | /* If we are in the NFS reference cache then don't do this now */ | |
1561 | if (ip->i_refcache) | |
1562 | return 0; | |
1563 | #endif | |
1564 | ||
1565 | mp = ip->i_mount; | |
1566 | ||
1567 | if (ip->i_d.di_nlink != 0) { | |
1568 | if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && | |
1569 | ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) && | |
1570 | (ip->i_df.if_flags & XFS_IFEXTENTS)) && | |
1571 | (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)))) { | |
1572 | if ((error = xfs_inactive_free_eofblocks(mp, ip))) | |
1573 | return (error); | |
1574 | /* Update linux inode block count after free above */ | |
1575 | LINVFS_GET_IP(vp)->i_blocks = XFS_FSB_TO_BB(mp, | |
1576 | ip->i_d.di_nblocks + ip->i_delayed_blks); | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | /* | |
1584 | * xfs_inactive | |
1585 | * | |
1586 | * This is called when the vnode reference count for the vnode | |
1587 | * goes to zero. If the file has been unlinked, then it must | |
1588 | * now be truncated. Also, we clear all of the read-ahead state | |
1589 | * kept for the inode here since the file is now closed. | |
1590 | */ | |
1591 | STATIC int | |
1592 | xfs_inactive( | |
1593 | bhv_desc_t *bdp, | |
1594 | cred_t *credp) | |
1595 | { | |
1596 | xfs_inode_t *ip; | |
1597 | vnode_t *vp; | |
1598 | xfs_bmap_free_t free_list; | |
1599 | xfs_fsblock_t first_block; | |
1600 | int committed; | |
1601 | xfs_trans_t *tp; | |
1602 | xfs_mount_t *mp; | |
1603 | int error; | |
1604 | int truncate; | |
1605 | ||
1606 | vp = BHV_TO_VNODE(bdp); | |
1607 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
1608 | ||
1609 | ip = XFS_BHVTOI(bdp); | |
1610 | ||
1611 | /* | |
1612 | * If the inode is already free, then there can be nothing | |
1613 | * to clean up here. | |
1614 | */ | |
1615 | if (ip->i_d.di_mode == 0 || VN_BAD(vp)) { | |
1616 | ASSERT(ip->i_df.if_real_bytes == 0); | |
1617 | ASSERT(ip->i_df.if_broot_bytes == 0); | |
1618 | return VN_INACTIVE_CACHE; | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * Only do a truncate if it's a regular file with | |
1623 | * some actual space in it. It's OK to look at the | |
1624 | * inode's fields without the lock because we're the | |
1625 | * only one with a reference to the inode. | |
1626 | */ | |
1627 | truncate = ((ip->i_d.di_nlink == 0) && | |
1628 | ((ip->i_d.di_size != 0) || (ip->i_d.di_nextents > 0)) && | |
1629 | ((ip->i_d.di_mode & S_IFMT) == S_IFREG)); | |
1630 | ||
1631 | mp = ip->i_mount; | |
1632 | ||
1633 | if (ip->i_d.di_nlink == 0 && | |
1634 | DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_DESTROY)) { | |
1635 | (void) XFS_SEND_DESTROY(mp, vp, DM_RIGHT_NULL); | |
1636 | } | |
1637 | ||
1638 | error = 0; | |
1639 | ||
1640 | /* If this is a read-only mount, don't do this (would generate I/O) */ | |
1641 | if (vp->v_vfsp->vfs_flag & VFS_RDONLY) | |
1642 | goto out; | |
1643 | ||
1644 | if (ip->i_d.di_nlink != 0) { | |
1645 | if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && | |
1646 | ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) && | |
1647 | (ip->i_df.if_flags & XFS_IFEXTENTS)) && | |
1648 | (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)) || | |
1649 | (ip->i_delayed_blks != 0))) { | |
1650 | if ((error = xfs_inactive_free_eofblocks(mp, ip))) | |
1651 | return (VN_INACTIVE_CACHE); | |
1652 | /* Update linux inode block count after free above */ | |
1653 | LINVFS_GET_IP(vp)->i_blocks = XFS_FSB_TO_BB(mp, | |
1654 | ip->i_d.di_nblocks + ip->i_delayed_blks); | |
1655 | } | |
1656 | goto out; | |
1657 | } | |
1658 | ||
1659 | ASSERT(ip->i_d.di_nlink == 0); | |
1660 | ||
1661 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
1662 | return (VN_INACTIVE_CACHE); | |
1663 | ||
1664 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1665 | if (truncate) { | |
1666 | /* | |
1667 | * Do the xfs_itruncate_start() call before | |
1668 | * reserving any log space because itruncate_start | |
1669 | * will call into the buffer cache and we can't | |
1670 | * do that within a transaction. | |
1671 | */ | |
1672 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1673 | ||
1674 | xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0); | |
1675 | ||
1676 | error = xfs_trans_reserve(tp, 0, | |
1677 | XFS_ITRUNCATE_LOG_RES(mp), | |
1678 | 0, XFS_TRANS_PERM_LOG_RES, | |
1679 | XFS_ITRUNCATE_LOG_COUNT); | |
1680 | if (error) { | |
1681 | /* Don't call itruncate_cleanup */ | |
1682 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1683 | xfs_trans_cancel(tp, 0); | |
1684 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1685 | return (VN_INACTIVE_CACHE); | |
1686 | } | |
1687 | ||
1688 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1689 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1690 | xfs_trans_ihold(tp, ip); | |
1691 | ||
1692 | /* | |
1693 | * normally, we have to run xfs_itruncate_finish sync. | |
1694 | * But if filesystem is wsync and we're in the inactive | |
1695 | * path, then we know that nlink == 0, and that the | |
1696 | * xaction that made nlink == 0 is permanently committed | |
1697 | * since xfs_remove runs as a synchronous transaction. | |
1698 | */ | |
1699 | error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK, | |
1700 | (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0)); | |
1701 | ||
1702 | if (error) { | |
1703 | xfs_trans_cancel(tp, | |
1704 | XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1705 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1706 | return (VN_INACTIVE_CACHE); | |
1707 | } | |
1708 | } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) { | |
1709 | ||
1710 | /* | |
1711 | * If we get an error while cleaning up a | |
1712 | * symlink we bail out. | |
1713 | */ | |
1714 | error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ? | |
1715 | xfs_inactive_symlink_rmt(ip, &tp) : | |
1716 | xfs_inactive_symlink_local(ip, &tp); | |
1717 | ||
1718 | if (error) { | |
1719 | ASSERT(tp == NULL); | |
1720 | return (VN_INACTIVE_CACHE); | |
1721 | } | |
1722 | ||
1723 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1724 | xfs_trans_ihold(tp, ip); | |
1725 | } else { | |
1726 | error = xfs_trans_reserve(tp, 0, | |
1727 | XFS_IFREE_LOG_RES(mp), | |
1728 | 0, XFS_TRANS_PERM_LOG_RES, | |
1729 | XFS_INACTIVE_LOG_COUNT); | |
1730 | if (error) { | |
1731 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1732 | xfs_trans_cancel(tp, 0); | |
1733 | return (VN_INACTIVE_CACHE); | |
1734 | } | |
1735 | ||
1736 | xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1737 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1738 | xfs_trans_ihold(tp, ip); | |
1739 | } | |
1740 | ||
1741 | /* | |
1742 | * If there are attributes associated with the file | |
1743 | * then blow them away now. The code calls a routine | |
1744 | * that recursively deconstructs the attribute fork. | |
1745 | * We need to just commit the current transaction | |
1746 | * because we can't use it for xfs_attr_inactive(). | |
1747 | */ | |
1748 | if (ip->i_d.di_anextents > 0) { | |
1749 | error = xfs_inactive_attrs(ip, &tp); | |
1750 | /* | |
1751 | * If we got an error, the transaction is already | |
1752 | * cancelled, and the inode is unlocked. Just get out. | |
1753 | */ | |
1754 | if (error) | |
1755 | return (VN_INACTIVE_CACHE); | |
1756 | } else if (ip->i_afp) { | |
1757 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
1758 | } | |
1759 | ||
1760 | /* | |
1761 | * Free the inode. | |
1762 | */ | |
1763 | XFS_BMAP_INIT(&free_list, &first_block); | |
1764 | error = xfs_ifree(tp, ip, &free_list); | |
1765 | if (error) { | |
1766 | /* | |
1767 | * If we fail to free the inode, shut down. The cancel | |
1768 | * might do that, we need to make sure. Otherwise the | |
1769 | * inode might be lost for a long time or forever. | |
1770 | */ | |
1771 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1772 | cmn_err(CE_NOTE, | |
1773 | "xfs_inactive: xfs_ifree() returned an error = %d on %s", | |
1774 | error, mp->m_fsname); | |
1775 | xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR); | |
1776 | } | |
1777 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); | |
1778 | } else { | |
1779 | /* | |
1780 | * Credit the quota account(s). The inode is gone. | |
1781 | */ | |
1782 | XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1); | |
1783 | ||
1784 | /* | |
1785 | * Just ignore errors at this point. There is | |
1786 | * nothing we can do except to try to keep going. | |
1787 | */ | |
1788 | (void) xfs_bmap_finish(&tp, &free_list, first_block, | |
1789 | &committed); | |
1790 | (void) xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
1791 | } | |
1792 | /* | |
1793 | * Release the dquots held by inode, if any. | |
1794 | */ | |
1795 | XFS_QM_DQDETACH(mp, ip); | |
1796 | ||
1797 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1798 | ||
1799 | out: | |
1800 | return VN_INACTIVE_CACHE; | |
1801 | } | |
1802 | ||
1803 | ||
1804 | /* | |
1805 | * xfs_lookup | |
1806 | */ | |
1807 | STATIC int | |
1808 | xfs_lookup( | |
1809 | bhv_desc_t *dir_bdp, | |
1810 | vname_t *dentry, | |
1811 | vnode_t **vpp, | |
1812 | int flags, | |
1813 | vnode_t *rdir, | |
1814 | cred_t *credp) | |
1815 | { | |
1816 | xfs_inode_t *dp, *ip; | |
1817 | xfs_ino_t e_inum; | |
1818 | int error; | |
1819 | uint lock_mode; | |
1820 | vnode_t *dir_vp; | |
1821 | ||
1822 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
1823 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
1824 | ||
1825 | dp = XFS_BHVTOI(dir_bdp); | |
1826 | ||
1827 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
1828 | return XFS_ERROR(EIO); | |
1829 | ||
1830 | lock_mode = xfs_ilock_map_shared(dp); | |
1831 | error = xfs_dir_lookup_int(dir_bdp, lock_mode, dentry, &e_inum, &ip); | |
1832 | if (!error) { | |
1833 | *vpp = XFS_ITOV(ip); | |
1834 | ITRACE(ip); | |
1835 | } | |
1836 | xfs_iunlock_map_shared(dp, lock_mode); | |
1837 | return error; | |
1838 | } | |
1839 | ||
1840 | ||
1841 | /* | |
1842 | * xfs_create (create a new file). | |
1843 | */ | |
1844 | STATIC int | |
1845 | xfs_create( | |
1846 | bhv_desc_t *dir_bdp, | |
1847 | vname_t *dentry, | |
1848 | vattr_t *vap, | |
1849 | vnode_t **vpp, | |
1850 | cred_t *credp) | |
1851 | { | |
1852 | char *name = VNAME(dentry); | |
1853 | vnode_t *dir_vp; | |
1854 | xfs_inode_t *dp, *ip; | |
1855 | vnode_t *vp=NULL; | |
1856 | xfs_trans_t *tp; | |
1857 | xfs_mount_t *mp; | |
1858 | xfs_dev_t rdev; | |
1859 | int error; | |
1860 | xfs_bmap_free_t free_list; | |
1861 | xfs_fsblock_t first_block; | |
1862 | boolean_t dp_joined_to_trans; | |
1863 | int dm_event_sent = 0; | |
1864 | uint cancel_flags; | |
1865 | int committed; | |
1866 | xfs_prid_t prid; | |
1867 | struct xfs_dquot *udqp, *gdqp; | |
1868 | uint resblks; | |
1869 | int dm_di_mode; | |
1870 | int namelen; | |
1871 | ||
1872 | ASSERT(!*vpp); | |
1873 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
1874 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
1875 | ||
1876 | dp = XFS_BHVTOI(dir_bdp); | |
1877 | mp = dp->i_mount; | |
1878 | ||
0432dab2 | 1879 | dm_di_mode = vap->va_mode; |
1da177e4 LT |
1880 | namelen = VNAMELEN(dentry); |
1881 | ||
1882 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) { | |
1883 | error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, | |
1884 | dir_vp, DM_RIGHT_NULL, NULL, | |
1885 | DM_RIGHT_NULL, name, NULL, | |
1886 | dm_di_mode, 0, 0); | |
1887 | ||
1888 | if (error) | |
1889 | return error; | |
1890 | dm_event_sent = 1; | |
1891 | } | |
1892 | ||
1893 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1894 | return XFS_ERROR(EIO); | |
1895 | ||
1896 | /* Return through std_return after this point. */ | |
1897 | ||
1898 | udqp = gdqp = NULL; | |
365ca83d NS |
1899 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
1900 | prid = dp->i_d.di_projid; | |
1901 | else if (vap->va_mask & XFS_AT_PROJID) | |
1da177e4 LT |
1902 | prid = (xfs_prid_t)vap->va_projid; |
1903 | else | |
1904 | prid = (xfs_prid_t)dfltprid; | |
1905 | ||
1906 | /* | |
1907 | * Make sure that we have allocated dquot(s) on disk. | |
1908 | */ | |
1909 | error = XFS_QM_DQVOPALLOC(mp, dp, | |
c8ad20ff | 1910 | current_fsuid(credp), current_fsgid(credp), prid, |
1da177e4 LT |
1911 | XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp); |
1912 | if (error) | |
1913 | goto std_return; | |
1914 | ||
1915 | ip = NULL; | |
1916 | dp_joined_to_trans = B_FALSE; | |
1917 | ||
1918 | tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); | |
1919 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
1920 | resblks = XFS_CREATE_SPACE_RES(mp, namelen); | |
1921 | /* | |
1922 | * Initially assume that the file does not exist and | |
1923 | * reserve the resources for that case. If that is not | |
1924 | * the case we'll drop the one we have and get a more | |
1925 | * appropriate transaction later. | |
1926 | */ | |
1927 | error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0, | |
1928 | XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); | |
1929 | if (error == ENOSPC) { | |
1930 | resblks = 0; | |
1931 | error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0, | |
1932 | XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); | |
1933 | } | |
1934 | if (error) { | |
1935 | cancel_flags = 0; | |
1936 | dp = NULL; | |
1937 | goto error_return; | |
1938 | } | |
1939 | ||
1940 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
1941 | ||
1942 | XFS_BMAP_INIT(&free_list, &first_block); | |
1943 | ||
1944 | ASSERT(ip == NULL); | |
1945 | ||
1946 | /* | |
1947 | * Reserve disk quota and the inode. | |
1948 | */ | |
1949 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); | |
1950 | if (error) | |
1951 | goto error_return; | |
1952 | ||
1953 | if (resblks == 0 && | |
1954 | (error = XFS_DIR_CANENTER(mp, tp, dp, name, namelen))) | |
1955 | goto error_return; | |
1956 | rdev = (vap->va_mask & XFS_AT_RDEV) ? vap->va_rdev : 0; | |
0432dab2 | 1957 | error = xfs_dir_ialloc(&tp, dp, vap->va_mode, 1, |
1da177e4 LT |
1958 | rdev, credp, prid, resblks > 0, |
1959 | &ip, &committed); | |
1960 | if (error) { | |
1961 | if (error == ENOSPC) | |
1962 | goto error_return; | |
1963 | goto abort_return; | |
1964 | } | |
1965 | ITRACE(ip); | |
1966 | ||
1967 | /* | |
1968 | * At this point, we've gotten a newly allocated inode. | |
1969 | * It is locked (and joined to the transaction). | |
1970 | */ | |
1971 | ||
1972 | ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE)); | |
1973 | ||
1974 | /* | |
1975 | * Now we join the directory inode to the transaction. | |
1976 | * We do not do it earlier because xfs_dir_ialloc | |
1977 | * might commit the previous transaction (and release | |
1978 | * all the locks). | |
1979 | */ | |
1980 | ||
1981 | VN_HOLD(dir_vp); | |
1982 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
1983 | dp_joined_to_trans = B_TRUE; | |
1984 | ||
1985 | error = XFS_DIR_CREATENAME(mp, tp, dp, name, namelen, ip->i_ino, | |
1986 | &first_block, &free_list, | |
1987 | resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0); | |
1988 | if (error) { | |
1989 | ASSERT(error != ENOSPC); | |
1990 | goto abort_return; | |
1991 | } | |
1992 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
1993 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
1994 | ||
1995 | /* | |
1996 | * If this is a synchronous mount, make sure that the | |
1997 | * create transaction goes to disk before returning to | |
1998 | * the user. | |
1999 | */ | |
2000 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2001 | xfs_trans_set_sync(tp); | |
2002 | } | |
2003 | ||
2004 | dp->i_gen++; | |
2005 | ||
2006 | /* | |
2007 | * Attach the dquot(s) to the inodes and modify them incore. | |
2008 | * These ids of the inode couldn't have changed since the new | |
2009 | * inode has been locked ever since it was created. | |
2010 | */ | |
2011 | XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp); | |
2012 | ||
2013 | /* | |
2014 | * xfs_trans_commit normally decrements the vnode ref count | |
2015 | * when it unlocks the inode. Since we want to return the | |
2016 | * vnode to the caller, we bump the vnode ref count now. | |
2017 | */ | |
2018 | IHOLD(ip); | |
2019 | vp = XFS_ITOV(ip); | |
2020 | ||
2021 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
2022 | if (error) { | |
2023 | xfs_bmap_cancel(&free_list); | |
2024 | goto abort_rele; | |
2025 | } | |
2026 | ||
2027 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2028 | if (error) { | |
2029 | IRELE(ip); | |
2030 | tp = NULL; | |
2031 | goto error_return; | |
2032 | } | |
2033 | ||
2034 | XFS_QM_DQRELE(mp, udqp); | |
2035 | XFS_QM_DQRELE(mp, gdqp); | |
2036 | ||
2037 | /* | |
2038 | * Propogate the fact that the vnode changed after the | |
2039 | * xfs_inode locks have been released. | |
2040 | */ | |
2041 | VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_TRUNCATED, 3); | |
2042 | ||
2043 | *vpp = vp; | |
2044 | ||
2045 | /* Fallthrough to std_return with error = 0 */ | |
2046 | ||
2047 | std_return: | |
2048 | if ( (*vpp || (error != 0 && dm_event_sent != 0)) && | |
2049 | DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), | |
2050 | DM_EVENT_POSTCREATE)) { | |
2051 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, | |
2052 | dir_vp, DM_RIGHT_NULL, | |
2053 | *vpp ? vp:NULL, | |
2054 | DM_RIGHT_NULL, name, NULL, | |
2055 | dm_di_mode, error, 0); | |
2056 | } | |
2057 | return error; | |
2058 | ||
2059 | abort_return: | |
2060 | cancel_flags |= XFS_TRANS_ABORT; | |
2061 | /* FALLTHROUGH */ | |
2062 | error_return: | |
2063 | ||
2064 | if (tp != NULL) | |
2065 | xfs_trans_cancel(tp, cancel_flags); | |
2066 | ||
2067 | if (!dp_joined_to_trans && (dp != NULL)) | |
2068 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2069 | XFS_QM_DQRELE(mp, udqp); | |
2070 | XFS_QM_DQRELE(mp, gdqp); | |
2071 | ||
2072 | goto std_return; | |
2073 | ||
2074 | abort_rele: | |
2075 | /* | |
2076 | * Wait until after the current transaction is aborted to | |
2077 | * release the inode. This prevents recursive transactions | |
2078 | * and deadlocks from xfs_inactive. | |
2079 | */ | |
2080 | cancel_flags |= XFS_TRANS_ABORT; | |
2081 | xfs_trans_cancel(tp, cancel_flags); | |
2082 | IRELE(ip); | |
2083 | ||
2084 | XFS_QM_DQRELE(mp, udqp); | |
2085 | XFS_QM_DQRELE(mp, gdqp); | |
2086 | ||
2087 | goto std_return; | |
2088 | } | |
2089 | ||
2090 | #ifdef DEBUG | |
2091 | /* | |
2092 | * Some counters to see if (and how often) we are hitting some deadlock | |
2093 | * prevention code paths. | |
2094 | */ | |
2095 | ||
2096 | int xfs_rm_locks; | |
2097 | int xfs_rm_lock_delays; | |
2098 | int xfs_rm_attempts; | |
2099 | #endif | |
2100 | ||
2101 | /* | |
2102 | * The following routine will lock the inodes associated with the | |
2103 | * directory and the named entry in the directory. The locks are | |
2104 | * acquired in increasing inode number. | |
2105 | * | |
2106 | * If the entry is "..", then only the directory is locked. The | |
2107 | * vnode ref count will still include that from the .. entry in | |
2108 | * this case. | |
2109 | * | |
2110 | * There is a deadlock we need to worry about. If the locked directory is | |
2111 | * in the AIL, it might be blocking up the log. The next inode we lock | |
2112 | * could be already locked by another thread waiting for log space (e.g | |
2113 | * a permanent log reservation with a long running transaction (see | |
2114 | * xfs_itruncate_finish)). To solve this, we must check if the directory | |
2115 | * is in the ail and use lock_nowait. If we can't lock, we need to | |
2116 | * drop the inode lock on the directory and try again. xfs_iunlock will | |
2117 | * potentially push the tail if we were holding up the log. | |
2118 | */ | |
2119 | STATIC int | |
2120 | xfs_lock_dir_and_entry( | |
2121 | xfs_inode_t *dp, | |
2122 | vname_t *dentry, | |
2123 | xfs_inode_t *ip) /* inode of entry 'name' */ | |
2124 | { | |
2125 | int attempts; | |
2126 | xfs_ino_t e_inum; | |
2127 | xfs_inode_t *ips[2]; | |
2128 | xfs_log_item_t *lp; | |
2129 | ||
2130 | #ifdef DEBUG | |
2131 | xfs_rm_locks++; | |
2132 | #endif | |
2133 | attempts = 0; | |
2134 | ||
2135 | again: | |
2136 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
2137 | ||
2138 | e_inum = ip->i_ino; | |
2139 | ||
2140 | ITRACE(ip); | |
2141 | ||
2142 | /* | |
2143 | * We want to lock in increasing inum. Since we've already | |
2144 | * acquired the lock on the directory, we may need to release | |
2145 | * if if the inum of the entry turns out to be less. | |
2146 | */ | |
2147 | if (e_inum > dp->i_ino) { | |
2148 | /* | |
2149 | * We are already in the right order, so just | |
2150 | * lock on the inode of the entry. | |
2151 | * We need to use nowait if dp is in the AIL. | |
2152 | */ | |
2153 | ||
2154 | lp = (xfs_log_item_t *)dp->i_itemp; | |
2155 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { | |
2156 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { | |
2157 | attempts++; | |
2158 | #ifdef DEBUG | |
2159 | xfs_rm_attempts++; | |
2160 | #endif | |
2161 | ||
2162 | /* | |
2163 | * Unlock dp and try again. | |
2164 | * xfs_iunlock will try to push the tail | |
2165 | * if the inode is in the AIL. | |
2166 | */ | |
2167 | ||
2168 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2169 | ||
2170 | if ((attempts % 5) == 0) { | |
2171 | delay(1); /* Don't just spin the CPU */ | |
2172 | #ifdef DEBUG | |
2173 | xfs_rm_lock_delays++; | |
2174 | #endif | |
2175 | } | |
2176 | goto again; | |
2177 | } | |
2178 | } else { | |
2179 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
2180 | } | |
2181 | } else if (e_inum < dp->i_ino) { | |
2182 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2183 | ||
2184 | ips[0] = ip; | |
2185 | ips[1] = dp; | |
2186 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
2187 | } | |
2188 | /* else e_inum == dp->i_ino */ | |
2189 | /* This can happen if we're asked to lock /x/.. | |
2190 | * the entry is "..", which is also the parent directory. | |
2191 | */ | |
2192 | ||
2193 | return 0; | |
2194 | } | |
2195 | ||
2196 | #ifdef DEBUG | |
2197 | int xfs_locked_n; | |
2198 | int xfs_small_retries; | |
2199 | int xfs_middle_retries; | |
2200 | int xfs_lots_retries; | |
2201 | int xfs_lock_delays; | |
2202 | #endif | |
2203 | ||
2204 | /* | |
2205 | * The following routine will lock n inodes in exclusive mode. | |
2206 | * We assume the caller calls us with the inodes in i_ino order. | |
2207 | * | |
2208 | * We need to detect deadlock where an inode that we lock | |
2209 | * is in the AIL and we start waiting for another inode that is locked | |
2210 | * by a thread in a long running transaction (such as truncate). This can | |
2211 | * result in deadlock since the long running trans might need to wait | |
2212 | * for the inode we just locked in order to push the tail and free space | |
2213 | * in the log. | |
2214 | */ | |
2215 | void | |
2216 | xfs_lock_inodes( | |
2217 | xfs_inode_t **ips, | |
2218 | int inodes, | |
2219 | int first_locked, | |
2220 | uint lock_mode) | |
2221 | { | |
2222 | int attempts = 0, i, j, try_lock; | |
2223 | xfs_log_item_t *lp; | |
2224 | ||
2225 | ASSERT(ips && (inodes >= 2)); /* we need at least two */ | |
2226 | ||
2227 | if (first_locked) { | |
2228 | try_lock = 1; | |
2229 | i = 1; | |
2230 | } else { | |
2231 | try_lock = 0; | |
2232 | i = 0; | |
2233 | } | |
2234 | ||
2235 | again: | |
2236 | for (; i < inodes; i++) { | |
2237 | ASSERT(ips[i]); | |
2238 | ||
2239 | if (i && (ips[i] == ips[i-1])) /* Already locked */ | |
2240 | continue; | |
2241 | ||
2242 | /* | |
2243 | * If try_lock is not set yet, make sure all locked inodes | |
2244 | * are not in the AIL. | |
2245 | * If any are, set try_lock to be used later. | |
2246 | */ | |
2247 | ||
2248 | if (!try_lock) { | |
2249 | for (j = (i - 1); j >= 0 && !try_lock; j--) { | |
2250 | lp = (xfs_log_item_t *)ips[j]->i_itemp; | |
2251 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { | |
2252 | try_lock++; | |
2253 | } | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | /* | |
2258 | * If any of the previous locks we have locked is in the AIL, | |
2259 | * we must TRY to get the second and subsequent locks. If | |
2260 | * we can't get any, we must release all we have | |
2261 | * and try again. | |
2262 | */ | |
2263 | ||
2264 | if (try_lock) { | |
2265 | /* try_lock must be 0 if i is 0. */ | |
2266 | /* | |
2267 | * try_lock means we have an inode locked | |
2268 | * that is in the AIL. | |
2269 | */ | |
2270 | ASSERT(i != 0); | |
2271 | if (!xfs_ilock_nowait(ips[i], lock_mode)) { | |
2272 | attempts++; | |
2273 | ||
2274 | /* | |
2275 | * Unlock all previous guys and try again. | |
2276 | * xfs_iunlock will try to push the tail | |
2277 | * if the inode is in the AIL. | |
2278 | */ | |
2279 | ||
2280 | for(j = i - 1; j >= 0; j--) { | |
2281 | ||
2282 | /* | |
2283 | * Check to see if we've already | |
2284 | * unlocked this one. | |
2285 | * Not the first one going back, | |
2286 | * and the inode ptr is the same. | |
2287 | */ | |
2288 | if ((j != (i - 1)) && ips[j] == | |
2289 | ips[j+1]) | |
2290 | continue; | |
2291 | ||
2292 | xfs_iunlock(ips[j], lock_mode); | |
2293 | } | |
2294 | ||
2295 | if ((attempts % 5) == 0) { | |
2296 | delay(1); /* Don't just spin the CPU */ | |
2297 | #ifdef DEBUG | |
2298 | xfs_lock_delays++; | |
2299 | #endif | |
2300 | } | |
2301 | i = 0; | |
2302 | try_lock = 0; | |
2303 | goto again; | |
2304 | } | |
2305 | } else { | |
2306 | xfs_ilock(ips[i], lock_mode); | |
2307 | } | |
2308 | } | |
2309 | ||
2310 | #ifdef DEBUG | |
2311 | if (attempts) { | |
2312 | if (attempts < 5) xfs_small_retries++; | |
2313 | else if (attempts < 100) xfs_middle_retries++; | |
2314 | else xfs_lots_retries++; | |
2315 | } else { | |
2316 | xfs_locked_n++; | |
2317 | } | |
2318 | #endif | |
2319 | } | |
2320 | ||
2321 | #ifdef DEBUG | |
2322 | #define REMOVE_DEBUG_TRACE(x) {remove_which_error_return = (x);} | |
2323 | int remove_which_error_return = 0; | |
2324 | #else /* ! DEBUG */ | |
2325 | #define REMOVE_DEBUG_TRACE(x) | |
2326 | #endif /* ! DEBUG */ | |
2327 | ||
2328 | ||
2329 | /* | |
2330 | * xfs_remove | |
2331 | * | |
2332 | */ | |
2333 | STATIC int | |
2334 | xfs_remove( | |
2335 | bhv_desc_t *dir_bdp, | |
2336 | vname_t *dentry, | |
2337 | cred_t *credp) | |
2338 | { | |
2339 | vnode_t *dir_vp; | |
2340 | char *name = VNAME(dentry); | |
2341 | xfs_inode_t *dp, *ip; | |
2342 | xfs_trans_t *tp = NULL; | |
2343 | xfs_mount_t *mp; | |
2344 | int error = 0; | |
2345 | xfs_bmap_free_t free_list; | |
2346 | xfs_fsblock_t first_block; | |
2347 | int cancel_flags; | |
2348 | int committed; | |
2349 | int dm_di_mode = 0; | |
2350 | int link_zero; | |
2351 | uint resblks; | |
2352 | int namelen; | |
2353 | ||
2354 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
2355 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
2356 | ||
2357 | dp = XFS_BHVTOI(dir_bdp); | |
2358 | mp = dp->i_mount; | |
2359 | ||
2360 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2361 | return XFS_ERROR(EIO); | |
2362 | ||
2363 | namelen = VNAMELEN(dentry); | |
2364 | ||
2365 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) { | |
2366 | error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp, | |
2367 | DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, | |
2368 | name, NULL, 0, 0, 0); | |
2369 | if (error) | |
2370 | return error; | |
2371 | } | |
2372 | ||
2373 | /* From this point on, return through std_return */ | |
2374 | ip = NULL; | |
2375 | ||
2376 | /* | |
2377 | * We need to get a reference to ip before we get our log | |
2378 | * reservation. The reason for this is that we cannot call | |
2379 | * xfs_iget for an inode for which we do not have a reference | |
2380 | * once we've acquired a log reservation. This is because the | |
2381 | * inode we are trying to get might be in xfs_inactive going | |
2382 | * for a log reservation. Since we'll have to wait for the | |
2383 | * inactive code to complete before returning from xfs_iget, | |
2384 | * we need to make sure that we don't have log space reserved | |
2385 | * when we call xfs_iget. Instead we get an unlocked referece | |
2386 | * to the inode before getting our log reservation. | |
2387 | */ | |
2388 | error = xfs_get_dir_entry(dentry, &ip); | |
2389 | if (error) { | |
2390 | REMOVE_DEBUG_TRACE(__LINE__); | |
2391 | goto std_return; | |
2392 | } | |
2393 | ||
2394 | dm_di_mode = ip->i_d.di_mode; | |
2395 | ||
2396 | vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); | |
2397 | ||
2398 | ITRACE(ip); | |
2399 | ||
2400 | error = XFS_QM_DQATTACH(mp, dp, 0); | |
2401 | if (!error && dp != ip) | |
2402 | error = XFS_QM_DQATTACH(mp, ip, 0); | |
2403 | if (error) { | |
2404 | REMOVE_DEBUG_TRACE(__LINE__); | |
2405 | IRELE(ip); | |
2406 | goto std_return; | |
2407 | } | |
2408 | ||
2409 | tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); | |
2410 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
2411 | /* | |
2412 | * We try to get the real space reservation first, | |
2413 | * allowing for directory btree deletion(s) implying | |
2414 | * possible bmap insert(s). If we can't get the space | |
2415 | * reservation then we use 0 instead, and avoid the bmap | |
2416 | * btree insert(s) in the directory code by, if the bmap | |
2417 | * insert tries to happen, instead trimming the LAST | |
2418 | * block from the directory. | |
2419 | */ | |
2420 | resblks = XFS_REMOVE_SPACE_RES(mp); | |
2421 | error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, | |
2422 | XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT); | |
2423 | if (error == ENOSPC) { | |
2424 | resblks = 0; | |
2425 | error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, | |
2426 | XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT); | |
2427 | } | |
2428 | if (error) { | |
2429 | ASSERT(error != ENOSPC); | |
2430 | REMOVE_DEBUG_TRACE(__LINE__); | |
2431 | xfs_trans_cancel(tp, 0); | |
2432 | IRELE(ip); | |
2433 | return error; | |
2434 | } | |
2435 | ||
2436 | error = xfs_lock_dir_and_entry(dp, dentry, ip); | |
2437 | if (error) { | |
2438 | REMOVE_DEBUG_TRACE(__LINE__); | |
2439 | xfs_trans_cancel(tp, cancel_flags); | |
2440 | IRELE(ip); | |
2441 | goto std_return; | |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * At this point, we've gotten both the directory and the entry | |
2446 | * inodes locked. | |
2447 | */ | |
2448 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2449 | if (dp != ip) { | |
2450 | /* | |
2451 | * Increment vnode ref count only in this case since | |
2452 | * there's an extra vnode reference in the case where | |
2453 | * dp == ip. | |
2454 | */ | |
2455 | IHOLD(dp); | |
2456 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
2457 | } | |
2458 | ||
2459 | /* | |
2460 | * Entry must exist since we did a lookup in xfs_lock_dir_and_entry. | |
2461 | */ | |
2462 | XFS_BMAP_INIT(&free_list, &first_block); | |
2463 | error = XFS_DIR_REMOVENAME(mp, tp, dp, name, namelen, ip->i_ino, | |
2464 | &first_block, &free_list, 0); | |
2465 | if (error) { | |
2466 | ASSERT(error != ENOENT); | |
2467 | REMOVE_DEBUG_TRACE(__LINE__); | |
2468 | goto error1; | |
2469 | } | |
2470 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2471 | ||
2472 | dp->i_gen++; | |
2473 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
2474 | ||
2475 | error = xfs_droplink(tp, ip); | |
2476 | if (error) { | |
2477 | REMOVE_DEBUG_TRACE(__LINE__); | |
2478 | goto error1; | |
2479 | } | |
2480 | ||
2481 | /* Determine if this is the last link while | |
2482 | * we are in the transaction. | |
2483 | */ | |
2484 | link_zero = (ip)->i_d.di_nlink==0; | |
2485 | ||
2486 | /* | |
2487 | * Take an extra ref on the inode so that it doesn't | |
2488 | * go to xfs_inactive() from within the commit. | |
2489 | */ | |
2490 | IHOLD(ip); | |
2491 | ||
2492 | /* | |
2493 | * If this is a synchronous mount, make sure that the | |
2494 | * remove transaction goes to disk before returning to | |
2495 | * the user. | |
2496 | */ | |
2497 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2498 | xfs_trans_set_sync(tp); | |
2499 | } | |
2500 | ||
2501 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
2502 | if (error) { | |
2503 | REMOVE_DEBUG_TRACE(__LINE__); | |
2504 | goto error_rele; | |
2505 | } | |
2506 | ||
2507 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2508 | if (error) { | |
2509 | IRELE(ip); | |
2510 | goto std_return; | |
2511 | } | |
2512 | ||
2513 | /* | |
2514 | * Before we drop our extra reference to the inode, purge it | |
2515 | * from the refcache if it is there. By waiting until afterwards | |
2516 | * to do the IRELE, we ensure that we won't go inactive in the | |
2517 | * xfs_refcache_purge_ip routine (although that would be OK). | |
2518 | */ | |
2519 | xfs_refcache_purge_ip(ip); | |
2520 | ||
2521 | vn_trace_exit(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); | |
2522 | ||
2523 | /* | |
2524 | * Let interposed file systems know about removed links. | |
2525 | */ | |
2526 | VOP_LINK_REMOVED(XFS_ITOV(ip), dir_vp, link_zero); | |
2527 | ||
2528 | IRELE(ip); | |
2529 | ||
2530 | /* Fall through to std_return with error = 0 */ | |
2531 | std_return: | |
2532 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, | |
2533 | DM_EVENT_POSTREMOVE)) { | |
2534 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, | |
2535 | dir_vp, DM_RIGHT_NULL, | |
2536 | NULL, DM_RIGHT_NULL, | |
2537 | name, NULL, dm_di_mode, error, 0); | |
2538 | } | |
2539 | return error; | |
2540 | ||
2541 | error1: | |
2542 | xfs_bmap_cancel(&free_list); | |
2543 | cancel_flags |= XFS_TRANS_ABORT; | |
2544 | xfs_trans_cancel(tp, cancel_flags); | |
2545 | goto std_return; | |
2546 | ||
2547 | error_rele: | |
2548 | /* | |
2549 | * In this case make sure to not release the inode until after | |
2550 | * the current transaction is aborted. Releasing it beforehand | |
2551 | * can cause us to go to xfs_inactive and start a recursive | |
2552 | * transaction which can easily deadlock with the current one. | |
2553 | */ | |
2554 | xfs_bmap_cancel(&free_list); | |
2555 | cancel_flags |= XFS_TRANS_ABORT; | |
2556 | xfs_trans_cancel(tp, cancel_flags); | |
2557 | ||
2558 | /* | |
2559 | * Before we drop our extra reference to the inode, purge it | |
2560 | * from the refcache if it is there. By waiting until afterwards | |
2561 | * to do the IRELE, we ensure that we won't go inactive in the | |
2562 | * xfs_refcache_purge_ip routine (although that would be OK). | |
2563 | */ | |
2564 | xfs_refcache_purge_ip(ip); | |
2565 | ||
2566 | IRELE(ip); | |
2567 | ||
2568 | goto std_return; | |
2569 | } | |
2570 | ||
2571 | ||
2572 | /* | |
2573 | * xfs_link | |
2574 | * | |
2575 | */ | |
2576 | STATIC int | |
2577 | xfs_link( | |
2578 | bhv_desc_t *target_dir_bdp, | |
2579 | vnode_t *src_vp, | |
2580 | vname_t *dentry, | |
2581 | cred_t *credp) | |
2582 | { | |
2583 | xfs_inode_t *tdp, *sip; | |
2584 | xfs_trans_t *tp; | |
2585 | xfs_mount_t *mp; | |
2586 | xfs_inode_t *ips[2]; | |
2587 | int error; | |
2588 | xfs_bmap_free_t free_list; | |
2589 | xfs_fsblock_t first_block; | |
2590 | int cancel_flags; | |
2591 | int committed; | |
2592 | vnode_t *target_dir_vp; | |
2593 | bhv_desc_t *src_bdp; | |
2594 | int resblks; | |
2595 | char *target_name = VNAME(dentry); | |
2596 | int target_namelen; | |
2597 | ||
2598 | target_dir_vp = BHV_TO_VNODE(target_dir_bdp); | |
2599 | vn_trace_entry(target_dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
2600 | vn_trace_entry(src_vp, __FUNCTION__, (inst_t *)__return_address); | |
2601 | ||
2602 | target_namelen = VNAMELEN(dentry); | |
0432dab2 | 2603 | if (VN_ISDIR(src_vp)) |
1da177e4 LT |
2604 | return XFS_ERROR(EPERM); |
2605 | ||
1da177e4 | 2606 | src_bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(src_vp), &xfs_vnodeops); |
1da177e4 LT |
2607 | sip = XFS_BHVTOI(src_bdp); |
2608 | tdp = XFS_BHVTOI(target_dir_bdp); | |
2609 | mp = tdp->i_mount; | |
2610 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2611 | return XFS_ERROR(EIO); | |
2612 | ||
2613 | if (DM_EVENT_ENABLED(src_vp->v_vfsp, tdp, DM_EVENT_LINK)) { | |
2614 | error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK, | |
2615 | target_dir_vp, DM_RIGHT_NULL, | |
2616 | src_vp, DM_RIGHT_NULL, | |
2617 | target_name, NULL, 0, 0, 0); | |
2618 | if (error) | |
2619 | return error; | |
2620 | } | |
2621 | ||
2622 | /* Return through std_return after this point. */ | |
2623 | ||
2624 | error = XFS_QM_DQATTACH(mp, sip, 0); | |
2625 | if (!error && sip != tdp) | |
2626 | error = XFS_QM_DQATTACH(mp, tdp, 0); | |
2627 | if (error) | |
2628 | goto std_return; | |
2629 | ||
2630 | tp = xfs_trans_alloc(mp, XFS_TRANS_LINK); | |
2631 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
2632 | resblks = XFS_LINK_SPACE_RES(mp, target_namelen); | |
2633 | error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0, | |
2634 | XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); | |
2635 | if (error == ENOSPC) { | |
2636 | resblks = 0; | |
2637 | error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0, | |
2638 | XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); | |
2639 | } | |
2640 | if (error) { | |
2641 | cancel_flags = 0; | |
2642 | goto error_return; | |
2643 | } | |
2644 | ||
2645 | if (sip->i_ino < tdp->i_ino) { | |
2646 | ips[0] = sip; | |
2647 | ips[1] = tdp; | |
2648 | } else { | |
2649 | ips[0] = tdp; | |
2650 | ips[1] = sip; | |
2651 | } | |
2652 | ||
2653 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
2654 | ||
2655 | /* | |
2656 | * Increment vnode ref counts since xfs_trans_commit & | |
2657 | * xfs_trans_cancel will both unlock the inodes and | |
2658 | * decrement the associated ref counts. | |
2659 | */ | |
2660 | VN_HOLD(src_vp); | |
2661 | VN_HOLD(target_dir_vp); | |
2662 | xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL); | |
2663 | xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); | |
2664 | ||
2665 | /* | |
2666 | * If the source has too many links, we can't make any more to it. | |
2667 | */ | |
2668 | if (sip->i_d.di_nlink >= XFS_MAXLINK) { | |
2669 | error = XFS_ERROR(EMLINK); | |
2670 | goto error_return; | |
2671 | } | |
2672 | ||
365ca83d NS |
2673 | /* |
2674 | * If we are using project inheritance, we only allow hard link | |
2675 | * creation in our tree when the project IDs are the same; else | |
2676 | * the tree quota mechanism could be circumvented. | |
2677 | */ | |
2678 | if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
2679 | (tdp->i_d.di_projid != sip->i_d.di_projid))) { | |
2680 | error = XFS_ERROR(EPERM); | |
2681 | goto error_return; | |
2682 | } | |
2683 | ||
1da177e4 LT |
2684 | if (resblks == 0 && |
2685 | (error = XFS_DIR_CANENTER(mp, tp, tdp, target_name, | |
2686 | target_namelen))) | |
2687 | goto error_return; | |
2688 | ||
2689 | XFS_BMAP_INIT(&free_list, &first_block); | |
2690 | ||
2691 | error = XFS_DIR_CREATENAME(mp, tp, tdp, target_name, target_namelen, | |
2692 | sip->i_ino, &first_block, &free_list, | |
2693 | resblks); | |
2694 | if (error) | |
2695 | goto abort_return; | |
2696 | xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2697 | tdp->i_gen++; | |
2698 | xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); | |
2699 | ||
2700 | error = xfs_bumplink(tp, sip); | |
2701 | if (error) { | |
2702 | goto abort_return; | |
2703 | } | |
2704 | ||
2705 | /* | |
2706 | * If this is a synchronous mount, make sure that the | |
2707 | * link transaction goes to disk before returning to | |
2708 | * the user. | |
2709 | */ | |
2710 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2711 | xfs_trans_set_sync(tp); | |
2712 | } | |
2713 | ||
2714 | error = xfs_bmap_finish (&tp, &free_list, first_block, &committed); | |
2715 | if (error) { | |
2716 | xfs_bmap_cancel(&free_list); | |
2717 | goto abort_return; | |
2718 | } | |
2719 | ||
2720 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2721 | if (error) { | |
2722 | goto std_return; | |
2723 | } | |
2724 | ||
2725 | /* Fall through to std_return with error = 0. */ | |
2726 | std_return: | |
2727 | if (DM_EVENT_ENABLED(src_vp->v_vfsp, sip, | |
2728 | DM_EVENT_POSTLINK)) { | |
2729 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK, | |
2730 | target_dir_vp, DM_RIGHT_NULL, | |
2731 | src_vp, DM_RIGHT_NULL, | |
2732 | target_name, NULL, 0, error, 0); | |
2733 | } | |
2734 | return error; | |
2735 | ||
2736 | abort_return: | |
2737 | cancel_flags |= XFS_TRANS_ABORT; | |
2738 | /* FALLTHROUGH */ | |
2739 | error_return: | |
2740 | xfs_trans_cancel(tp, cancel_flags); | |
2741 | ||
2742 | goto std_return; | |
2743 | } | |
2744 | /* | |
2745 | * xfs_mkdir | |
2746 | * | |
2747 | */ | |
2748 | STATIC int | |
2749 | xfs_mkdir( | |
2750 | bhv_desc_t *dir_bdp, | |
2751 | vname_t *dentry, | |
2752 | vattr_t *vap, | |
2753 | vnode_t **vpp, | |
2754 | cred_t *credp) | |
2755 | { | |
2756 | char *dir_name = VNAME(dentry); | |
2757 | xfs_inode_t *dp; | |
2758 | xfs_inode_t *cdp; /* inode of created dir */ | |
2759 | vnode_t *cvp; /* vnode of created dir */ | |
2760 | xfs_trans_t *tp; | |
2761 | xfs_mount_t *mp; | |
2762 | int cancel_flags; | |
2763 | int error; | |
2764 | int committed; | |
2765 | xfs_bmap_free_t free_list; | |
2766 | xfs_fsblock_t first_block; | |
2767 | vnode_t *dir_vp; | |
2768 | boolean_t dp_joined_to_trans; | |
2769 | boolean_t created = B_FALSE; | |
2770 | int dm_event_sent = 0; | |
2771 | xfs_prid_t prid; | |
2772 | struct xfs_dquot *udqp, *gdqp; | |
2773 | uint resblks; | |
2774 | int dm_di_mode; | |
2775 | int dir_namelen; | |
2776 | ||
2777 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
2778 | dp = XFS_BHVTOI(dir_bdp); | |
2779 | mp = dp->i_mount; | |
2780 | ||
2781 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2782 | return XFS_ERROR(EIO); | |
2783 | ||
2784 | dir_namelen = VNAMELEN(dentry); | |
2785 | ||
2786 | tp = NULL; | |
2787 | dp_joined_to_trans = B_FALSE; | |
0432dab2 | 2788 | dm_di_mode = vap->va_mode; |
1da177e4 LT |
2789 | |
2790 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) { | |
2791 | error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, | |
2792 | dir_vp, DM_RIGHT_NULL, NULL, | |
2793 | DM_RIGHT_NULL, dir_name, NULL, | |
2794 | dm_di_mode, 0, 0); | |
2795 | if (error) | |
2796 | return error; | |
2797 | dm_event_sent = 1; | |
2798 | } | |
2799 | ||
2800 | /* Return through std_return after this point. */ | |
2801 | ||
2802 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
2803 | ||
2804 | mp = dp->i_mount; | |
2805 | udqp = gdqp = NULL; | |
365ca83d NS |
2806 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
2807 | prid = dp->i_d.di_projid; | |
2808 | else if (vap->va_mask & XFS_AT_PROJID) | |
1da177e4 LT |
2809 | prid = (xfs_prid_t)vap->va_projid; |
2810 | else | |
2811 | prid = (xfs_prid_t)dfltprid; | |
2812 | ||
2813 | /* | |
2814 | * Make sure that we have allocated dquot(s) on disk. | |
2815 | */ | |
2816 | error = XFS_QM_DQVOPALLOC(mp, dp, | |
c8ad20ff | 2817 | current_fsuid(credp), current_fsgid(credp), prid, |
1da177e4 LT |
2818 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); |
2819 | if (error) | |
2820 | goto std_return; | |
2821 | ||
2822 | tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); | |
2823 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
2824 | resblks = XFS_MKDIR_SPACE_RES(mp, dir_namelen); | |
2825 | error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0, | |
2826 | XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT); | |
2827 | if (error == ENOSPC) { | |
2828 | resblks = 0; | |
2829 | error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0, | |
2830 | XFS_TRANS_PERM_LOG_RES, | |
2831 | XFS_MKDIR_LOG_COUNT); | |
2832 | } | |
2833 | if (error) { | |
2834 | cancel_flags = 0; | |
2835 | dp = NULL; | |
2836 | goto error_return; | |
2837 | } | |
2838 | ||
2839 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
2840 | ||
2841 | /* | |
2842 | * Check for directory link count overflow. | |
2843 | */ | |
2844 | if (dp->i_d.di_nlink >= XFS_MAXLINK) { | |
2845 | error = XFS_ERROR(EMLINK); | |
2846 | goto error_return; | |
2847 | } | |
2848 | ||
2849 | /* | |
2850 | * Reserve disk quota and the inode. | |
2851 | */ | |
2852 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); | |
2853 | if (error) | |
2854 | goto error_return; | |
2855 | ||
2856 | if (resblks == 0 && | |
2857 | (error = XFS_DIR_CANENTER(mp, tp, dp, dir_name, dir_namelen))) | |
2858 | goto error_return; | |
2859 | /* | |
2860 | * create the directory inode. | |
2861 | */ | |
0432dab2 | 2862 | error = xfs_dir_ialloc(&tp, dp, vap->va_mode, 2, |
1da177e4 LT |
2863 | 0, credp, prid, resblks > 0, |
2864 | &cdp, NULL); | |
2865 | if (error) { | |
2866 | if (error == ENOSPC) | |
2867 | goto error_return; | |
2868 | goto abort_return; | |
2869 | } | |
2870 | ITRACE(cdp); | |
2871 | ||
2872 | /* | |
2873 | * Now we add the directory inode to the transaction. | |
2874 | * We waited until now since xfs_dir_ialloc might start | |
2875 | * a new transaction. Had we joined the transaction | |
2876 | * earlier, the locks might have gotten released. | |
2877 | */ | |
2878 | VN_HOLD(dir_vp); | |
2879 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2880 | dp_joined_to_trans = B_TRUE; | |
2881 | ||
2882 | XFS_BMAP_INIT(&free_list, &first_block); | |
2883 | ||
2884 | error = XFS_DIR_CREATENAME(mp, tp, dp, dir_name, dir_namelen, | |
2885 | cdp->i_ino, &first_block, &free_list, | |
2886 | resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0); | |
2887 | if (error) { | |
2888 | ASSERT(error != ENOSPC); | |
2889 | goto error1; | |
2890 | } | |
2891 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2892 | ||
2893 | /* | |
2894 | * Bump the in memory version number of the parent directory | |
2895 | * so that other processes accessing it will recognize that | |
2896 | * the directory has changed. | |
2897 | */ | |
2898 | dp->i_gen++; | |
2899 | ||
2900 | error = XFS_DIR_INIT(mp, tp, cdp, dp); | |
2901 | if (error) { | |
2902 | goto error2; | |
2903 | } | |
2904 | ||
2905 | cdp->i_gen = 1; | |
2906 | error = xfs_bumplink(tp, dp); | |
2907 | if (error) { | |
2908 | goto error2; | |
2909 | } | |
2910 | ||
2911 | cvp = XFS_ITOV(cdp); | |
2912 | ||
2913 | created = B_TRUE; | |
2914 | ||
2915 | *vpp = cvp; | |
2916 | IHOLD(cdp); | |
2917 | ||
2918 | /* | |
2919 | * Attach the dquots to the new inode and modify the icount incore. | |
2920 | */ | |
2921 | XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp); | |
2922 | ||
2923 | /* | |
2924 | * If this is a synchronous mount, make sure that the | |
2925 | * mkdir transaction goes to disk before returning to | |
2926 | * the user. | |
2927 | */ | |
2928 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2929 | xfs_trans_set_sync(tp); | |
2930 | } | |
2931 | ||
2932 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
2933 | if (error) { | |
2934 | IRELE(cdp); | |
2935 | goto error2; | |
2936 | } | |
2937 | ||
2938 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2939 | XFS_QM_DQRELE(mp, udqp); | |
2940 | XFS_QM_DQRELE(mp, gdqp); | |
2941 | if (error) { | |
2942 | IRELE(cdp); | |
2943 | } | |
2944 | ||
2945 | /* Fall through to std_return with error = 0 or errno from | |
2946 | * xfs_trans_commit. */ | |
2947 | ||
2948 | std_return: | |
2949 | if ( (created || (error != 0 && dm_event_sent != 0)) && | |
2950 | DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), | |
2951 | DM_EVENT_POSTCREATE)) { | |
2952 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, | |
2953 | dir_vp, DM_RIGHT_NULL, | |
2954 | created ? XFS_ITOV(cdp):NULL, | |
2955 | DM_RIGHT_NULL, | |
2956 | dir_name, NULL, | |
2957 | dm_di_mode, error, 0); | |
2958 | } | |
2959 | return error; | |
2960 | ||
2961 | error2: | |
2962 | error1: | |
2963 | xfs_bmap_cancel(&free_list); | |
2964 | abort_return: | |
2965 | cancel_flags |= XFS_TRANS_ABORT; | |
2966 | error_return: | |
2967 | xfs_trans_cancel(tp, cancel_flags); | |
2968 | XFS_QM_DQRELE(mp, udqp); | |
2969 | XFS_QM_DQRELE(mp, gdqp); | |
2970 | ||
2971 | if (!dp_joined_to_trans && (dp != NULL)) { | |
2972 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2973 | } | |
2974 | ||
2975 | goto std_return; | |
2976 | } | |
2977 | ||
2978 | ||
2979 | /* | |
2980 | * xfs_rmdir | |
2981 | * | |
2982 | */ | |
2983 | STATIC int | |
2984 | xfs_rmdir( | |
2985 | bhv_desc_t *dir_bdp, | |
2986 | vname_t *dentry, | |
2987 | cred_t *credp) | |
2988 | { | |
2989 | char *name = VNAME(dentry); | |
2990 | xfs_inode_t *dp; | |
2991 | xfs_inode_t *cdp; /* child directory */ | |
2992 | xfs_trans_t *tp; | |
2993 | xfs_mount_t *mp; | |
2994 | int error; | |
2995 | xfs_bmap_free_t free_list; | |
2996 | xfs_fsblock_t first_block; | |
2997 | int cancel_flags; | |
2998 | int committed; | |
2999 | vnode_t *dir_vp; | |
3000 | int dm_di_mode = 0; | |
3001 | int last_cdp_link; | |
3002 | int namelen; | |
3003 | uint resblks; | |
3004 | ||
3005 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
3006 | dp = XFS_BHVTOI(dir_bdp); | |
3007 | mp = dp->i_mount; | |
3008 | ||
3009 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
3010 | ||
3011 | if (XFS_FORCED_SHUTDOWN(XFS_BHVTOI(dir_bdp)->i_mount)) | |
3012 | return XFS_ERROR(EIO); | |
3013 | namelen = VNAMELEN(dentry); | |
3014 | ||
3015 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) { | |
3016 | error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, | |
3017 | dir_vp, DM_RIGHT_NULL, | |
3018 | NULL, DM_RIGHT_NULL, | |
3019 | name, NULL, 0, 0, 0); | |
3020 | if (error) | |
3021 | return XFS_ERROR(error); | |
3022 | } | |
3023 | ||
3024 | /* Return through std_return after this point. */ | |
3025 | ||
3026 | cdp = NULL; | |
3027 | ||
3028 | /* | |
3029 | * We need to get a reference to cdp before we get our log | |
3030 | * reservation. The reason for this is that we cannot call | |
3031 | * xfs_iget for an inode for which we do not have a reference | |
3032 | * once we've acquired a log reservation. This is because the | |
3033 | * inode we are trying to get might be in xfs_inactive going | |
3034 | * for a log reservation. Since we'll have to wait for the | |
3035 | * inactive code to complete before returning from xfs_iget, | |
3036 | * we need to make sure that we don't have log space reserved | |
3037 | * when we call xfs_iget. Instead we get an unlocked referece | |
3038 | * to the inode before getting our log reservation. | |
3039 | */ | |
3040 | error = xfs_get_dir_entry(dentry, &cdp); | |
3041 | if (error) { | |
3042 | REMOVE_DEBUG_TRACE(__LINE__); | |
3043 | goto std_return; | |
3044 | } | |
3045 | mp = dp->i_mount; | |
3046 | dm_di_mode = cdp->i_d.di_mode; | |
3047 | ||
3048 | /* | |
3049 | * Get the dquots for the inodes. | |
3050 | */ | |
3051 | error = XFS_QM_DQATTACH(mp, dp, 0); | |
3052 | if (!error && dp != cdp) | |
3053 | error = XFS_QM_DQATTACH(mp, cdp, 0); | |
3054 | if (error) { | |
3055 | IRELE(cdp); | |
3056 | REMOVE_DEBUG_TRACE(__LINE__); | |
3057 | goto std_return; | |
3058 | } | |
3059 | ||
3060 | tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); | |
3061 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
3062 | /* | |
3063 | * We try to get the real space reservation first, | |
3064 | * allowing for directory btree deletion(s) implying | |
3065 | * possible bmap insert(s). If we can't get the space | |
3066 | * reservation then we use 0 instead, and avoid the bmap | |
3067 | * btree insert(s) in the directory code by, if the bmap | |
3068 | * insert tries to happen, instead trimming the LAST | |
3069 | * block from the directory. | |
3070 | */ | |
3071 | resblks = XFS_REMOVE_SPACE_RES(mp); | |
3072 | error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, | |
3073 | XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT); | |
3074 | if (error == ENOSPC) { | |
3075 | resblks = 0; | |
3076 | error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, | |
3077 | XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT); | |
3078 | } | |
3079 | if (error) { | |
3080 | ASSERT(error != ENOSPC); | |
3081 | cancel_flags = 0; | |
3082 | IRELE(cdp); | |
3083 | goto error_return; | |
3084 | } | |
3085 | XFS_BMAP_INIT(&free_list, &first_block); | |
3086 | ||
3087 | /* | |
3088 | * Now lock the child directory inode and the parent directory | |
3089 | * inode in the proper order. This will take care of validating | |
3090 | * that the directory entry for the child directory inode has | |
3091 | * not changed while we were obtaining a log reservation. | |
3092 | */ | |
3093 | error = xfs_lock_dir_and_entry(dp, dentry, cdp); | |
3094 | if (error) { | |
3095 | xfs_trans_cancel(tp, cancel_flags); | |
3096 | IRELE(cdp); | |
3097 | goto std_return; | |
3098 | } | |
3099 | ||
3100 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
3101 | if (dp != cdp) { | |
3102 | /* | |
3103 | * Only increment the parent directory vnode count if | |
3104 | * we didn't bump it in looking up cdp. The only time | |
3105 | * we don't bump it is when we're looking up ".". | |
3106 | */ | |
3107 | VN_HOLD(dir_vp); | |
3108 | } | |
3109 | ||
3110 | ITRACE(cdp); | |
3111 | xfs_trans_ijoin(tp, cdp, XFS_ILOCK_EXCL); | |
3112 | ||
3113 | ASSERT(cdp->i_d.di_nlink >= 2); | |
3114 | if (cdp->i_d.di_nlink != 2) { | |
3115 | error = XFS_ERROR(ENOTEMPTY); | |
3116 | goto error_return; | |
3117 | } | |
3118 | if (!XFS_DIR_ISEMPTY(mp, cdp)) { | |
3119 | error = XFS_ERROR(ENOTEMPTY); | |
3120 | goto error_return; | |
3121 | } | |
3122 | ||
3123 | error = XFS_DIR_REMOVENAME(mp, tp, dp, name, namelen, cdp->i_ino, | |
3124 | &first_block, &free_list, resblks); | |
3125 | if (error) { | |
3126 | goto error1; | |
3127 | } | |
3128 | ||
3129 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
3130 | ||
3131 | /* | |
3132 | * Bump the in memory generation count on the parent | |
3133 | * directory so that other can know that it has changed. | |
3134 | */ | |
3135 | dp->i_gen++; | |
3136 | ||
3137 | /* | |
3138 | * Drop the link from cdp's "..". | |
3139 | */ | |
3140 | error = xfs_droplink(tp, dp); | |
3141 | if (error) { | |
3142 | goto error1; | |
3143 | } | |
3144 | ||
3145 | /* | |
3146 | * Drop the link from dp to cdp. | |
3147 | */ | |
3148 | error = xfs_droplink(tp, cdp); | |
3149 | if (error) { | |
3150 | goto error1; | |
3151 | } | |
3152 | ||
3153 | /* | |
3154 | * Drop the "." link from cdp to self. | |
3155 | */ | |
3156 | error = xfs_droplink(tp, cdp); | |
3157 | if (error) { | |
3158 | goto error1; | |
3159 | } | |
3160 | ||
3161 | /* Determine these before committing transaction */ | |
3162 | last_cdp_link = (cdp)->i_d.di_nlink==0; | |
3163 | ||
3164 | /* | |
3165 | * Take an extra ref on the child vnode so that it | |
3166 | * does not go to xfs_inactive() from within the commit. | |
3167 | */ | |
3168 | IHOLD(cdp); | |
3169 | ||
3170 | /* | |
3171 | * If this is a synchronous mount, make sure that the | |
3172 | * rmdir transaction goes to disk before returning to | |
3173 | * the user. | |
3174 | */ | |
3175 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
3176 | xfs_trans_set_sync(tp); | |
3177 | } | |
3178 | ||
3179 | error = xfs_bmap_finish (&tp, &free_list, first_block, &committed); | |
3180 | if (error) { | |
3181 | xfs_bmap_cancel(&free_list); | |
3182 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | | |
3183 | XFS_TRANS_ABORT)); | |
3184 | IRELE(cdp); | |
3185 | goto std_return; | |
3186 | } | |
3187 | ||
3188 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
3189 | if (error) { | |
3190 | IRELE(cdp); | |
3191 | goto std_return; | |
3192 | } | |
3193 | ||
3194 | ||
3195 | /* | |
3196 | * Let interposed file systems know about removed links. | |
3197 | */ | |
3198 | VOP_LINK_REMOVED(XFS_ITOV(cdp), dir_vp, last_cdp_link); | |
3199 | ||
3200 | IRELE(cdp); | |
3201 | ||
3202 | /* Fall through to std_return with error = 0 or the errno | |
3203 | * from xfs_trans_commit. */ | |
3204 | std_return: | |
3205 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_POSTREMOVE)) { | |
3206 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, | |
3207 | dir_vp, DM_RIGHT_NULL, | |
3208 | NULL, DM_RIGHT_NULL, | |
3209 | name, NULL, dm_di_mode, | |
3210 | error, 0); | |
3211 | } | |
3212 | return error; | |
3213 | ||
3214 | error1: | |
3215 | xfs_bmap_cancel(&free_list); | |
3216 | cancel_flags |= XFS_TRANS_ABORT; | |
3217 | error_return: | |
3218 | xfs_trans_cancel(tp, cancel_flags); | |
3219 | goto std_return; | |
3220 | } | |
3221 | ||
3222 | ||
3223 | /* | |
3224 | * xfs_readdir | |
3225 | * | |
3226 | * Read dp's entries starting at uiop->uio_offset and translate them into | |
3227 | * bufsize bytes worth of struct dirents starting at bufbase. | |
3228 | */ | |
3229 | STATIC int | |
3230 | xfs_readdir( | |
3231 | bhv_desc_t *dir_bdp, | |
3232 | uio_t *uiop, | |
3233 | cred_t *credp, | |
3234 | int *eofp) | |
3235 | { | |
3236 | xfs_inode_t *dp; | |
3237 | xfs_trans_t *tp = NULL; | |
3238 | int error = 0; | |
3239 | uint lock_mode; | |
3240 | xfs_off_t start_offset; | |
3241 | ||
3242 | vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__, | |
3243 | (inst_t *)__return_address); | |
3244 | dp = XFS_BHVTOI(dir_bdp); | |
3245 | ||
3246 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) { | |
3247 | return XFS_ERROR(EIO); | |
3248 | } | |
3249 | ||
3250 | lock_mode = xfs_ilock_map_shared(dp); | |
3251 | start_offset = uiop->uio_offset; | |
3252 | error = XFS_DIR_GETDENTS(dp->i_mount, tp, dp, uiop, eofp); | |
3253 | if (start_offset != uiop->uio_offset) { | |
3254 | xfs_ichgtime(dp, XFS_ICHGTIME_ACC); | |
3255 | } | |
3256 | xfs_iunlock_map_shared(dp, lock_mode); | |
3257 | return error; | |
3258 | } | |
3259 | ||
3260 | ||
3261 | /* | |
3262 | * xfs_symlink | |
3263 | * | |
3264 | */ | |
3265 | STATIC int | |
3266 | xfs_symlink( | |
3267 | bhv_desc_t *dir_bdp, | |
3268 | vname_t *dentry, | |
3269 | vattr_t *vap, | |
3270 | char *target_path, | |
3271 | vnode_t **vpp, | |
3272 | cred_t *credp) | |
3273 | { | |
3274 | xfs_trans_t *tp; | |
3275 | xfs_mount_t *mp; | |
3276 | xfs_inode_t *dp; | |
3277 | xfs_inode_t *ip; | |
3278 | int error; | |
3279 | int pathlen; | |
3280 | xfs_bmap_free_t free_list; | |
3281 | xfs_fsblock_t first_block; | |
3282 | boolean_t dp_joined_to_trans; | |
3283 | vnode_t *dir_vp; | |
3284 | uint cancel_flags; | |
3285 | int committed; | |
3286 | xfs_fileoff_t first_fsb; | |
3287 | xfs_filblks_t fs_blocks; | |
3288 | int nmaps; | |
3289 | xfs_bmbt_irec_t mval[SYMLINK_MAPS]; | |
3290 | xfs_daddr_t d; | |
3291 | char *cur_chunk; | |
3292 | int byte_cnt; | |
3293 | int n; | |
3294 | xfs_buf_t *bp; | |
3295 | xfs_prid_t prid; | |
3296 | struct xfs_dquot *udqp, *gdqp; | |
3297 | uint resblks; | |
3298 | char *link_name = VNAME(dentry); | |
3299 | int link_namelen; | |
3300 | ||
3301 | *vpp = NULL; | |
3302 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
3303 | dp = XFS_BHVTOI(dir_bdp); | |
3304 | dp_joined_to_trans = B_FALSE; | |
3305 | error = 0; | |
3306 | ip = NULL; | |
3307 | tp = NULL; | |
3308 | ||
3309 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
3310 | ||
3311 | mp = dp->i_mount; | |
3312 | ||
3313 | if (XFS_FORCED_SHUTDOWN(mp)) | |
3314 | return XFS_ERROR(EIO); | |
3315 | ||
3316 | link_namelen = VNAMELEN(dentry); | |
3317 | ||
3318 | /* | |
3319 | * Check component lengths of the target path name. | |
3320 | */ | |
3321 | pathlen = strlen(target_path); | |
3322 | if (pathlen >= MAXPATHLEN) /* total string too long */ | |
3323 | return XFS_ERROR(ENAMETOOLONG); | |
3324 | if (pathlen >= MAXNAMELEN) { /* is any component too long? */ | |
3325 | int len, total; | |
3326 | char *path; | |
3327 | ||
3328 | for(total = 0, path = target_path; total < pathlen;) { | |
3329 | /* | |
3330 | * Skip any slashes. | |
3331 | */ | |
3332 | while(*path == '/') { | |
3333 | total++; | |
3334 | path++; | |
3335 | } | |
3336 | ||
3337 | /* | |
3338 | * Count up to the next slash or end of path. | |
3339 | * Error out if the component is bigger than MAXNAMELEN. | |
3340 | */ | |
3341 | for(len = 0; *path != '/' && total < pathlen;total++, path++) { | |
3342 | if (++len >= MAXNAMELEN) { | |
3343 | error = ENAMETOOLONG; | |
3344 | return error; | |
3345 | } | |
3346 | } | |
3347 | } | |
3348 | } | |
3349 | ||
3350 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_SYMLINK)) { | |
3351 | error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dir_vp, | |
3352 | DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, | |
3353 | link_name, target_path, 0, 0, 0); | |
3354 | if (error) | |
3355 | return error; | |
3356 | } | |
3357 | ||
3358 | /* Return through std_return after this point. */ | |
3359 | ||
3360 | udqp = gdqp = NULL; | |
365ca83d NS |
3361 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
3362 | prid = dp->i_d.di_projid; | |
3363 | else if (vap->va_mask & XFS_AT_PROJID) | |
1da177e4 LT |
3364 | prid = (xfs_prid_t)vap->va_projid; |
3365 | else | |
3366 | prid = (xfs_prid_t)dfltprid; | |
3367 | ||
3368 | /* | |
3369 | * Make sure that we have allocated dquot(s) on disk. | |
3370 | */ | |
3371 | error = XFS_QM_DQVOPALLOC(mp, dp, | |
c8ad20ff | 3372 | current_fsuid(credp), current_fsgid(credp), prid, |
1da177e4 LT |
3373 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); |
3374 | if (error) | |
3375 | goto std_return; | |
3376 | ||
3377 | tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); | |
3378 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
3379 | /* | |
3380 | * The symlink will fit into the inode data fork? | |
3381 | * There can't be any attributes so we get the whole variable part. | |
3382 | */ | |
3383 | if (pathlen <= XFS_LITINO(mp)) | |
3384 | fs_blocks = 0; | |
3385 | else | |
3386 | fs_blocks = XFS_B_TO_FSB(mp, pathlen); | |
3387 | resblks = XFS_SYMLINK_SPACE_RES(mp, link_namelen, fs_blocks); | |
3388 | error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, | |
3389 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
3390 | if (error == ENOSPC && fs_blocks == 0) { | |
3391 | resblks = 0; | |
3392 | error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, | |
3393 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
3394 | } | |
3395 | if (error) { | |
3396 | cancel_flags = 0; | |
3397 | dp = NULL; | |
3398 | goto error_return; | |
3399 | } | |
3400 | ||
3401 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
3402 | ||
3403 | /* | |
3404 | * Check whether the directory allows new symlinks or not. | |
3405 | */ | |
3406 | if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { | |
3407 | error = XFS_ERROR(EPERM); | |
3408 | goto error_return; | |
3409 | } | |
3410 | ||
3411 | /* | |
3412 | * Reserve disk quota : blocks and inode. | |
3413 | */ | |
3414 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); | |
3415 | if (error) | |
3416 | goto error_return; | |
3417 | ||
3418 | /* | |
3419 | * Check for ability to enter directory entry, if no space reserved. | |
3420 | */ | |
3421 | if (resblks == 0 && | |
3422 | (error = XFS_DIR_CANENTER(mp, tp, dp, link_name, link_namelen))) | |
3423 | goto error_return; | |
3424 | /* | |
3425 | * Initialize the bmap freelist prior to calling either | |
3426 | * bmapi or the directory create code. | |
3427 | */ | |
3428 | XFS_BMAP_INIT(&free_list, &first_block); | |
3429 | ||
3430 | /* | |
3431 | * Allocate an inode for the symlink. | |
3432 | */ | |
3433 | error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (vap->va_mode&~S_IFMT), | |
3434 | 1, 0, credp, prid, resblks > 0, &ip, NULL); | |
3435 | if (error) { | |
3436 | if (error == ENOSPC) | |
3437 | goto error_return; | |
3438 | goto error1; | |
3439 | } | |
3440 | ITRACE(ip); | |
3441 | ||
3442 | VN_HOLD(dir_vp); | |
3443 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
3444 | dp_joined_to_trans = B_TRUE; | |
3445 | ||
3446 | /* | |
3447 | * Also attach the dquot(s) to it, if applicable. | |
3448 | */ | |
3449 | XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp); | |
3450 | ||
3451 | if (resblks) | |
3452 | resblks -= XFS_IALLOC_SPACE_RES(mp); | |
3453 | /* | |
3454 | * If the symlink will fit into the inode, write it inline. | |
3455 | */ | |
3456 | if (pathlen <= XFS_IFORK_DSIZE(ip)) { | |
3457 | xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); | |
3458 | memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); | |
3459 | ip->i_d.di_size = pathlen; | |
3460 | ||
3461 | /* | |
3462 | * The inode was initially created in extent format. | |
3463 | */ | |
3464 | ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); | |
3465 | ip->i_df.if_flags |= XFS_IFINLINE; | |
3466 | ||
3467 | ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
3468 | xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); | |
3469 | ||
3470 | } else { | |
3471 | first_fsb = 0; | |
3472 | nmaps = SYMLINK_MAPS; | |
3473 | ||
3474 | error = xfs_bmapi(tp, ip, first_fsb, fs_blocks, | |
3475 | XFS_BMAPI_WRITE | XFS_BMAPI_METADATA, | |
3476 | &first_block, resblks, mval, &nmaps, | |
3477 | &free_list); | |
3478 | if (error) { | |
3479 | goto error1; | |
3480 | } | |
3481 | ||
3482 | if (resblks) | |
3483 | resblks -= fs_blocks; | |
3484 | ip->i_d.di_size = pathlen; | |
3485 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
3486 | ||
3487 | cur_chunk = target_path; | |
3488 | for (n = 0; n < nmaps; n++) { | |
3489 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
3490 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
3491 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, | |
3492 | BTOBB(byte_cnt), 0); | |
3493 | ASSERT(bp && !XFS_BUF_GETERROR(bp)); | |
3494 | if (pathlen < byte_cnt) { | |
3495 | byte_cnt = pathlen; | |
3496 | } | |
3497 | pathlen -= byte_cnt; | |
3498 | ||
3499 | memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt); | |
3500 | cur_chunk += byte_cnt; | |
3501 | ||
3502 | xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1); | |
3503 | } | |
3504 | } | |
3505 | ||
3506 | /* | |
3507 | * Create the directory entry for the symlink. | |
3508 | */ | |
3509 | error = XFS_DIR_CREATENAME(mp, tp, dp, link_name, link_namelen, | |
3510 | ip->i_ino, &first_block, &free_list, resblks); | |
3511 | if (error) { | |
3512 | goto error1; | |
3513 | } | |
3514 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
3515 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
3516 | ||
3517 | /* | |
3518 | * Bump the in memory version number of the parent directory | |
3519 | * so that other processes accessing it will recognize that | |
3520 | * the directory has changed. | |
3521 | */ | |
3522 | dp->i_gen++; | |
3523 | ||
3524 | /* | |
3525 | * If this is a synchronous mount, make sure that the | |
3526 | * symlink transaction goes to disk before returning to | |
3527 | * the user. | |
3528 | */ | |
3529 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
3530 | xfs_trans_set_sync(tp); | |
3531 | } | |
3532 | ||
3533 | /* | |
3534 | * xfs_trans_commit normally decrements the vnode ref count | |
3535 | * when it unlocks the inode. Since we want to return the | |
3536 | * vnode to the caller, we bump the vnode ref count now. | |
3537 | */ | |
3538 | IHOLD(ip); | |
3539 | ||
3540 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
3541 | if (error) { | |
3542 | goto error2; | |
3543 | } | |
3544 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
3545 | XFS_QM_DQRELE(mp, udqp); | |
3546 | XFS_QM_DQRELE(mp, gdqp); | |
3547 | ||
3548 | /* Fall through to std_return with error = 0 or errno from | |
3549 | * xfs_trans_commit */ | |
3550 | std_return: | |
3551 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), | |
3552 | DM_EVENT_POSTSYMLINK)) { | |
3553 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK, | |
3554 | dir_vp, DM_RIGHT_NULL, | |
3555 | error ? NULL : XFS_ITOV(ip), | |
3556 | DM_RIGHT_NULL, link_name, target_path, | |
3557 | 0, error, 0); | |
3558 | } | |
3559 | ||
3560 | if (!error) { | |
3561 | vnode_t *vp; | |
3562 | ||
3563 | ASSERT(ip); | |
3564 | vp = XFS_ITOV(ip); | |
3565 | *vpp = vp; | |
3566 | } | |
3567 | return error; | |
3568 | ||
3569 | error2: | |
3570 | IRELE(ip); | |
3571 | error1: | |
3572 | xfs_bmap_cancel(&free_list); | |
3573 | cancel_flags |= XFS_TRANS_ABORT; | |
3574 | error_return: | |
3575 | xfs_trans_cancel(tp, cancel_flags); | |
3576 | XFS_QM_DQRELE(mp, udqp); | |
3577 | XFS_QM_DQRELE(mp, gdqp); | |
3578 | ||
3579 | if (!dp_joined_to_trans && (dp != NULL)) { | |
3580 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
3581 | } | |
3582 | ||
3583 | goto std_return; | |
3584 | } | |
3585 | ||
3586 | ||
3587 | /* | |
3588 | * xfs_fid2 | |
3589 | * | |
3590 | * A fid routine that takes a pointer to a previously allocated | |
3591 | * fid structure (like xfs_fast_fid) but uses a 64 bit inode number. | |
3592 | */ | |
3593 | STATIC int | |
3594 | xfs_fid2( | |
3595 | bhv_desc_t *bdp, | |
3596 | fid_t *fidp) | |
3597 | { | |
3598 | xfs_inode_t *ip; | |
3599 | xfs_fid2_t *xfid; | |
3600 | ||
3601 | vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, | |
3602 | (inst_t *)__return_address); | |
3603 | ASSERT(sizeof(fid_t) >= sizeof(xfs_fid2_t)); | |
3604 | ||
3605 | xfid = (xfs_fid2_t *)fidp; | |
3606 | ip = XFS_BHVTOI(bdp); | |
3607 | xfid->fid_len = sizeof(xfs_fid2_t) - sizeof(xfid->fid_len); | |
3608 | xfid->fid_pad = 0; | |
3609 | /* | |
3610 | * use memcpy because the inode is a long long and there's no | |
3611 | * assurance that xfid->fid_ino is properly aligned. | |
3612 | */ | |
3613 | memcpy(&xfid->fid_ino, &ip->i_ino, sizeof(xfid->fid_ino)); | |
3614 | xfid->fid_gen = ip->i_d.di_gen; | |
3615 | ||
3616 | return 0; | |
3617 | } | |
3618 | ||
3619 | ||
3620 | /* | |
3621 | * xfs_rwlock | |
3622 | */ | |
3623 | int | |
3624 | xfs_rwlock( | |
3625 | bhv_desc_t *bdp, | |
3626 | vrwlock_t locktype) | |
3627 | { | |
3628 | xfs_inode_t *ip; | |
3629 | vnode_t *vp; | |
3630 | ||
3631 | vp = BHV_TO_VNODE(bdp); | |
0432dab2 | 3632 | if (VN_ISDIR(vp)) |
1da177e4 LT |
3633 | return 1; |
3634 | ip = XFS_BHVTOI(bdp); | |
3635 | if (locktype == VRWLOCK_WRITE) { | |
3636 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
3637 | } else if (locktype == VRWLOCK_TRY_READ) { | |
3638 | return (xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)); | |
3639 | } else if (locktype == VRWLOCK_TRY_WRITE) { | |
3640 | return (xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)); | |
3641 | } else { | |
3642 | ASSERT((locktype == VRWLOCK_READ) || | |
3643 | (locktype == VRWLOCK_WRITE_DIRECT)); | |
3644 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
3645 | } | |
3646 | ||
3647 | return 1; | |
3648 | } | |
3649 | ||
3650 | ||
3651 | /* | |
3652 | * xfs_rwunlock | |
3653 | */ | |
3654 | void | |
3655 | xfs_rwunlock( | |
3656 | bhv_desc_t *bdp, | |
3657 | vrwlock_t locktype) | |
3658 | { | |
3659 | xfs_inode_t *ip; | |
3660 | vnode_t *vp; | |
3661 | ||
3662 | vp = BHV_TO_VNODE(bdp); | |
0432dab2 | 3663 | if (VN_ISDIR(vp)) |
1da177e4 LT |
3664 | return; |
3665 | ip = XFS_BHVTOI(bdp); | |
3666 | if (locktype == VRWLOCK_WRITE) { | |
3667 | /* | |
3668 | * In the write case, we may have added a new entry to | |
3669 | * the reference cache. This might store a pointer to | |
3670 | * an inode to be released in this inode. If it is there, | |
3671 | * clear the pointer and release the inode after unlocking | |
3672 | * this one. | |
3673 | */ | |
3674 | xfs_refcache_iunlock(ip, XFS_IOLOCK_EXCL); | |
3675 | } else { | |
3676 | ASSERT((locktype == VRWLOCK_READ) || | |
3677 | (locktype == VRWLOCK_WRITE_DIRECT)); | |
3678 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
3679 | } | |
3680 | return; | |
3681 | } | |
3682 | ||
3683 | STATIC int | |
3684 | xfs_inode_flush( | |
3685 | bhv_desc_t *bdp, | |
3686 | int flags) | |
3687 | { | |
3688 | xfs_inode_t *ip; | |
3689 | xfs_mount_t *mp; | |
3690 | xfs_inode_log_item_t *iip; | |
3691 | int error = 0; | |
3692 | ||
3693 | ip = XFS_BHVTOI(bdp); | |
3694 | mp = ip->i_mount; | |
3695 | iip = ip->i_itemp; | |
3696 | ||
3697 | if (XFS_FORCED_SHUTDOWN(mp)) | |
3698 | return XFS_ERROR(EIO); | |
3699 | ||
3700 | /* | |
3701 | * Bypass inodes which have already been cleaned by | |
3702 | * the inode flush clustering code inside xfs_iflush | |
3703 | */ | |
3704 | if ((ip->i_update_core == 0) && | |
3705 | ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL))) | |
3706 | return 0; | |
3707 | ||
3708 | if (flags & FLUSH_LOG) { | |
3709 | if (iip && iip->ili_last_lsn) { | |
3710 | xlog_t *log = mp->m_log; | |
3711 | xfs_lsn_t sync_lsn; | |
3712 | int s, log_flags = XFS_LOG_FORCE; | |
3713 | ||
3714 | s = GRANT_LOCK(log); | |
3715 | sync_lsn = log->l_last_sync_lsn; | |
3716 | GRANT_UNLOCK(log, s); | |
3717 | ||
3718 | if ((XFS_LSN_CMP(iip->ili_last_lsn, sync_lsn) <= 0)) | |
3719 | return 0; | |
3720 | ||
3721 | if (flags & FLUSH_SYNC) | |
3722 | log_flags |= XFS_LOG_SYNC; | |
3723 | return xfs_log_force(mp, iip->ili_last_lsn, log_flags); | |
3724 | } | |
3725 | } | |
3726 | ||
3727 | /* | |
3728 | * We make this non-blocking if the inode is contended, | |
3729 | * return EAGAIN to indicate to the caller that they | |
3730 | * did not succeed. This prevents the flush path from | |
3731 | * blocking on inodes inside another operation right | |
3732 | * now, they get caught later by xfs_sync. | |
3733 | */ | |
3734 | if (flags & FLUSH_INODE) { | |
3735 | int flush_flags; | |
3736 | ||
3737 | if (xfs_ipincount(ip)) | |
3738 | return EAGAIN; | |
3739 | ||
3740 | if (flags & FLUSH_SYNC) { | |
3741 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
3742 | xfs_iflock(ip); | |
3743 | } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
3744 | if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) { | |
3745 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
3746 | return EAGAIN; | |
3747 | } | |
3748 | } else { | |
3749 | return EAGAIN; | |
3750 | } | |
3751 | ||
3752 | if (flags & FLUSH_SYNC) | |
3753 | flush_flags = XFS_IFLUSH_SYNC; | |
3754 | else | |
3755 | flush_flags = XFS_IFLUSH_ASYNC; | |
3756 | ||
3757 | error = xfs_iflush(ip, flush_flags); | |
3758 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
3759 | } | |
3760 | ||
3761 | return error; | |
3762 | } | |
3763 | ||
3764 | ||
3765 | int | |
3766 | xfs_set_dmattrs ( | |
3767 | bhv_desc_t *bdp, | |
3768 | u_int evmask, | |
3769 | u_int16_t state, | |
3770 | cred_t *credp) | |
3771 | { | |
3772 | xfs_inode_t *ip; | |
3773 | xfs_trans_t *tp; | |
3774 | xfs_mount_t *mp; | |
3775 | int error; | |
3776 | ||
3777 | if (!capable(CAP_SYS_ADMIN)) | |
3778 | return XFS_ERROR(EPERM); | |
3779 | ||
3780 | ip = XFS_BHVTOI(bdp); | |
3781 | mp = ip->i_mount; | |
3782 | ||
3783 | if (XFS_FORCED_SHUTDOWN(mp)) | |
3784 | return XFS_ERROR(EIO); | |
3785 | ||
3786 | tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS); | |
3787 | error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0); | |
3788 | if (error) { | |
3789 | xfs_trans_cancel(tp, 0); | |
3790 | return error; | |
3791 | } | |
3792 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
3793 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
3794 | ||
3795 | ip->i_iocore.io_dmevmask = ip->i_d.di_dmevmask = evmask; | |
3796 | ip->i_iocore.io_dmstate = ip->i_d.di_dmstate = state; | |
3797 | ||
3798 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
3799 | IHOLD(ip); | |
3800 | error = xfs_trans_commit(tp, 0, NULL); | |
3801 | ||
3802 | return error; | |
3803 | } | |
3804 | ||
3805 | ||
3806 | /* | |
3807 | * xfs_reclaim | |
3808 | */ | |
3809 | STATIC int | |
3810 | xfs_reclaim( | |
3811 | bhv_desc_t *bdp) | |
3812 | { | |
3813 | xfs_inode_t *ip; | |
3814 | vnode_t *vp; | |
3815 | ||
3816 | vp = BHV_TO_VNODE(bdp); | |
3817 | ip = XFS_BHVTOI(bdp); | |
3818 | ||
3819 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
3820 | ||
3821 | ASSERT(!VN_MAPPED(vp)); | |
3822 | ||
3823 | /* bad inode, get out here ASAP */ | |
3824 | if (VN_BAD(vp)) { | |
3825 | xfs_ireclaim(ip); | |
3826 | return 0; | |
3827 | } | |
3828 | ||
51c91ed5 | 3829 | vn_iowait(vp); |
1da177e4 | 3830 | |
51c91ed5 CH |
3831 | ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); |
3832 | ASSERT(VN_CACHED(vp) == 0); | |
1da177e4 LT |
3833 | |
3834 | /* If we have nothing to flush with this inode then complete the | |
3835 | * teardown now, otherwise break the link between the xfs inode | |
3836 | * and the linux inode and clean up the xfs inode later. This | |
3837 | * avoids flushing the inode to disk during the delete operation | |
3838 | * itself. | |
3839 | */ | |
3840 | if (!ip->i_update_core && (ip->i_itemp == NULL)) { | |
3841 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
3842 | xfs_iflock(ip); | |
3843 | return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC); | |
3844 | } else { | |
3845 | xfs_mount_t *mp = ip->i_mount; | |
3846 | ||
3847 | /* Protect sync from us */ | |
3848 | XFS_MOUNT_ILOCK(mp); | |
3849 | vn_bhv_remove(VN_BHV_HEAD(vp), XFS_ITOBHV(ip)); | |
3850 | list_add_tail(&ip->i_reclaim, &mp->m_del_inodes); | |
3851 | ip->i_flags |= XFS_IRECLAIMABLE; | |
3852 | XFS_MOUNT_IUNLOCK(mp); | |
3853 | } | |
3854 | return 0; | |
3855 | } | |
3856 | ||
3857 | int | |
3858 | xfs_finish_reclaim( | |
3859 | xfs_inode_t *ip, | |
3860 | int locked, | |
3861 | int sync_mode) | |
3862 | { | |
3863 | xfs_ihash_t *ih = ip->i_hash; | |
3864 | vnode_t *vp = XFS_ITOV_NULL(ip); | |
3865 | int error; | |
3866 | ||
3867 | if (vp && VN_BAD(vp)) | |
3868 | goto reclaim; | |
3869 | ||
3870 | /* The hash lock here protects a thread in xfs_iget_core from | |
3871 | * racing with us on linking the inode back with a vnode. | |
3872 | * Once we have the XFS_IRECLAIM flag set it will not touch | |
3873 | * us. | |
3874 | */ | |
3875 | write_lock(&ih->ih_lock); | |
3876 | if ((ip->i_flags & XFS_IRECLAIM) || | |
3877 | (!(ip->i_flags & XFS_IRECLAIMABLE) && vp == NULL)) { | |
3878 | write_unlock(&ih->ih_lock); | |
3879 | if (locked) { | |
3880 | xfs_ifunlock(ip); | |
3881 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3882 | } | |
3883 | return(1); | |
3884 | } | |
3885 | ip->i_flags |= XFS_IRECLAIM; | |
3886 | write_unlock(&ih->ih_lock); | |
3887 | ||
3888 | /* | |
3889 | * If the inode is still dirty, then flush it out. If the inode | |
3890 | * is not in the AIL, then it will be OK to flush it delwri as | |
3891 | * long as xfs_iflush() does not keep any references to the inode. | |
3892 | * We leave that decision up to xfs_iflush() since it has the | |
3893 | * knowledge of whether it's OK to simply do a delwri flush of | |
3894 | * the inode or whether we need to wait until the inode is | |
3895 | * pulled from the AIL. | |
3896 | * We get the flush lock regardless, though, just to make sure | |
3897 | * we don't free it while it is being flushed. | |
3898 | */ | |
3899 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
3900 | if (!locked) { | |
3901 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
3902 | xfs_iflock(ip); | |
3903 | } | |
3904 | ||
3905 | if (ip->i_update_core || | |
3906 | ((ip->i_itemp != NULL) && | |
3907 | (ip->i_itemp->ili_format.ilf_fields != 0))) { | |
3908 | error = xfs_iflush(ip, sync_mode); | |
3909 | /* | |
3910 | * If we hit an error, typically because of filesystem | |
3911 | * shutdown, we don't need to let vn_reclaim to know | |
3912 | * because we're gonna reclaim the inode anyway. | |
3913 | */ | |
3914 | if (error) { | |
3915 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3916 | goto reclaim; | |
3917 | } | |
3918 | xfs_iflock(ip); /* synchronize with xfs_iflush_done */ | |
3919 | } | |
3920 | ||
3921 | ASSERT(ip->i_update_core == 0); | |
3922 | ASSERT(ip->i_itemp == NULL || | |
3923 | ip->i_itemp->ili_format.ilf_fields == 0); | |
3924 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3925 | } else if (locked) { | |
3926 | /* | |
3927 | * We are not interested in doing an iflush if we're | |
3928 | * in the process of shutting down the filesystem forcibly. | |
3929 | * So, just reclaim the inode. | |
3930 | */ | |
3931 | xfs_ifunlock(ip); | |
3932 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3933 | } | |
3934 | ||
3935 | reclaim: | |
3936 | xfs_ireclaim(ip); | |
3937 | return 0; | |
3938 | } | |
3939 | ||
3940 | int | |
3941 | xfs_finish_reclaim_all(xfs_mount_t *mp, int noblock) | |
3942 | { | |
3943 | int purged; | |
3944 | xfs_inode_t *ip, *n; | |
3945 | int done = 0; | |
3946 | ||
3947 | while (!done) { | |
3948 | purged = 0; | |
3949 | XFS_MOUNT_ILOCK(mp); | |
3950 | list_for_each_entry_safe(ip, n, &mp->m_del_inodes, i_reclaim) { | |
3951 | if (noblock) { | |
3952 | if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) | |
3953 | continue; | |
3954 | if (xfs_ipincount(ip) || | |
3955 | !xfs_iflock_nowait(ip)) { | |
3956 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3957 | continue; | |
3958 | } | |
3959 | } | |
3960 | XFS_MOUNT_IUNLOCK(mp); | |
6b2cf618 FB |
3961 | if (xfs_finish_reclaim(ip, noblock, |
3962 | XFS_IFLUSH_DELWRI_ELSE_ASYNC)) | |
3963 | delay(1); | |
1da177e4 LT |
3964 | purged = 1; |
3965 | break; | |
3966 | } | |
3967 | ||
3968 | done = !purged; | |
3969 | } | |
3970 | ||
3971 | XFS_MOUNT_IUNLOCK(mp); | |
3972 | return 0; | |
3973 | } | |
3974 | ||
3975 | /* | |
3976 | * xfs_alloc_file_space() | |
3977 | * This routine allocates disk space for the given file. | |
3978 | * | |
3979 | * If alloc_type == 0, this request is for an ALLOCSP type | |
3980 | * request which will change the file size. In this case, no | |
3981 | * DMAPI event will be generated by the call. A TRUNCATE event | |
3982 | * will be generated later by xfs_setattr. | |
3983 | * | |
3984 | * If alloc_type != 0, this request is for a RESVSP type | |
3985 | * request, and a DMAPI DM_EVENT_WRITE will be generated if the | |
3986 | * lower block boundary byte address is less than the file's | |
3987 | * length. | |
3988 | * | |
3989 | * RETURNS: | |
3990 | * 0 on success | |
3991 | * errno on error | |
3992 | * | |
3993 | */ | |
ba0f32d4 | 3994 | STATIC int |
1da177e4 LT |
3995 | xfs_alloc_file_space( |
3996 | xfs_inode_t *ip, | |
3997 | xfs_off_t offset, | |
3998 | xfs_off_t len, | |
3999 | int alloc_type, | |
4000 | int attr_flags) | |
4001 | { | |
4002 | xfs_filblks_t allocated_fsb; | |
4003 | xfs_filblks_t allocatesize_fsb; | |
4004 | int committed; | |
4005 | xfs_off_t count; | |
4006 | xfs_filblks_t datablocks; | |
4007 | int error; | |
4008 | xfs_fsblock_t firstfsb; | |
4009 | xfs_bmap_free_t free_list; | |
4010 | xfs_bmbt_irec_t *imapp; | |
4011 | xfs_bmbt_irec_t imaps[1]; | |
4012 | xfs_mount_t *mp; | |
4013 | int numrtextents; | |
4014 | int reccount; | |
4015 | uint resblks; | |
4016 | int rt; | |
4017 | int rtextsize; | |
4018 | xfs_fileoff_t startoffset_fsb; | |
4019 | xfs_trans_t *tp; | |
4020 | int xfs_bmapi_flags; | |
4021 | ||
4022 | vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); | |
4023 | mp = ip->i_mount; | |
4024 | ||
4025 | if (XFS_FORCED_SHUTDOWN(mp)) | |
4026 | return XFS_ERROR(EIO); | |
4027 | ||
4028 | /* | |
4029 | * determine if this is a realtime file | |
4030 | */ | |
4031 | if ((rt = XFS_IS_REALTIME_INODE(ip)) != 0) { | |
4032 | if (ip->i_d.di_extsize) | |
4033 | rtextsize = ip->i_d.di_extsize; | |
4034 | else | |
4035 | rtextsize = mp->m_sb.sb_rextsize; | |
4036 | } else | |
4037 | rtextsize = 0; | |
4038 | ||
4039 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
4040 | return error; | |
4041 | ||
4042 | if (len <= 0) | |
4043 | return XFS_ERROR(EINVAL); | |
4044 | ||
4045 | count = len; | |
4046 | error = 0; | |
4047 | imapp = &imaps[0]; | |
4048 | reccount = 1; | |
4049 | xfs_bmapi_flags = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0); | |
4050 | startoffset_fsb = XFS_B_TO_FSBT(mp, offset); | |
4051 | allocatesize_fsb = XFS_B_TO_FSB(mp, count); | |
4052 | ||
4053 | /* Generate a DMAPI event if needed. */ | |
4054 | if (alloc_type != 0 && offset < ip->i_d.di_size && | |
4055 | (attr_flags&ATTR_DMI) == 0 && | |
4056 | DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) { | |
4057 | xfs_off_t end_dmi_offset; | |
4058 | ||
4059 | end_dmi_offset = offset+len; | |
4060 | if (end_dmi_offset > ip->i_d.di_size) | |
4061 | end_dmi_offset = ip->i_d.di_size; | |
4062 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, XFS_ITOV(ip), | |
4063 | offset, end_dmi_offset - offset, | |
4064 | 0, NULL); | |
4065 | if (error) | |
4066 | return(error); | |
4067 | } | |
4068 | ||
4069 | /* | |
4070 | * allocate file space until done or until there is an error | |
4071 | */ | |
4072 | retry: | |
4073 | while (allocatesize_fsb && !error) { | |
4074 | /* | |
4075 | * determine if reserving space on | |
4076 | * the data or realtime partition. | |
4077 | */ | |
4078 | if (rt) { | |
4079 | xfs_fileoff_t s, e; | |
4080 | ||
4081 | s = startoffset_fsb; | |
4082 | do_div(s, rtextsize); | |
4083 | s *= rtextsize; | |
4084 | e = roundup_64(startoffset_fsb + allocatesize_fsb, | |
4085 | rtextsize); | |
4086 | numrtextents = (int)(e - s) / mp->m_sb.sb_rextsize; | |
4087 | datablocks = 0; | |
4088 | } else { | |
4089 | datablocks = allocatesize_fsb; | |
4090 | numrtextents = 0; | |
4091 | } | |
4092 | ||
4093 | /* | |
4094 | * allocate and setup the transaction | |
4095 | */ | |
4096 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
4097 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks); | |
4098 | error = xfs_trans_reserve(tp, | |
4099 | resblks, | |
4100 | XFS_WRITE_LOG_RES(mp), | |
4101 | numrtextents, | |
4102 | XFS_TRANS_PERM_LOG_RES, | |
4103 | XFS_WRITE_LOG_COUNT); | |
4104 | ||
4105 | /* | |
4106 | * check for running out of space | |
4107 | */ | |
4108 | if (error) { | |
4109 | /* | |
4110 | * Free the transaction structure. | |
4111 | */ | |
4112 | ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
4113 | xfs_trans_cancel(tp, 0); | |
4114 | break; | |
4115 | } | |
4116 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
06d10dd9 NS |
4117 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, |
4118 | ip->i_udquot, ip->i_gdquot, resblks, 0, 0); | |
1da177e4 LT |
4119 | if (error) |
4120 | goto error1; | |
4121 | ||
4122 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
4123 | xfs_trans_ihold(tp, ip); | |
4124 | ||
4125 | /* | |
4126 | * issue the bmapi() call to allocate the blocks | |
4127 | */ | |
4128 | XFS_BMAP_INIT(&free_list, &firstfsb); | |
4129 | error = xfs_bmapi(tp, ip, startoffset_fsb, | |
4130 | allocatesize_fsb, xfs_bmapi_flags, | |
4131 | &firstfsb, 0, imapp, &reccount, | |
4132 | &free_list); | |
4133 | if (error) { | |
4134 | goto error0; | |
4135 | } | |
4136 | ||
4137 | /* | |
4138 | * complete the transaction | |
4139 | */ | |
4140 | error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); | |
4141 | if (error) { | |
4142 | goto error0; | |
4143 | } | |
4144 | ||
4145 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
4146 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4147 | if (error) { | |
4148 | break; | |
4149 | } | |
4150 | ||
4151 | allocated_fsb = imapp->br_blockcount; | |
4152 | ||
4153 | if (reccount == 0) { | |
4154 | error = XFS_ERROR(ENOSPC); | |
4155 | break; | |
4156 | } | |
4157 | ||
4158 | startoffset_fsb += allocated_fsb; | |
4159 | allocatesize_fsb -= allocated_fsb; | |
4160 | } | |
4161 | dmapi_enospc_check: | |
4162 | if (error == ENOSPC && (attr_flags&ATTR_DMI) == 0 && | |
4163 | DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_NOSPACE)) { | |
4164 | ||
4165 | error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE, | |
4166 | XFS_ITOV(ip), DM_RIGHT_NULL, | |
4167 | XFS_ITOV(ip), DM_RIGHT_NULL, | |
4168 | NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */ | |
4169 | if (error == 0) | |
4170 | goto retry; /* Maybe DMAPI app. has made space */ | |
4171 | /* else fall through with error from XFS_SEND_DATA */ | |
4172 | } | |
4173 | ||
4174 | return error; | |
4175 | ||
4176 | error0: | |
4177 | xfs_bmap_cancel(&free_list); | |
4178 | error1: | |
4179 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
4180 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4181 | goto dmapi_enospc_check; | |
4182 | } | |
4183 | ||
4184 | /* | |
4185 | * Zero file bytes between startoff and endoff inclusive. | |
4186 | * The iolock is held exclusive and no blocks are buffered. | |
4187 | */ | |
4188 | STATIC int | |
4189 | xfs_zero_remaining_bytes( | |
4190 | xfs_inode_t *ip, | |
4191 | xfs_off_t startoff, | |
4192 | xfs_off_t endoff) | |
4193 | { | |
4194 | xfs_bmbt_irec_t imap; | |
4195 | xfs_fileoff_t offset_fsb; | |
4196 | xfs_off_t lastoffset; | |
4197 | xfs_off_t offset; | |
4198 | xfs_buf_t *bp; | |
4199 | xfs_mount_t *mp = ip->i_mount; | |
4200 | int nimap; | |
4201 | int error = 0; | |
4202 | ||
4203 | bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize, | |
4204 | ip->i_d.di_flags & XFS_DIFLAG_REALTIME ? | |
4205 | mp->m_rtdev_targp : mp->m_ddev_targp); | |
4206 | ||
4207 | for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { | |
4208 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
4209 | nimap = 1; | |
4210 | error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0, NULL, 0, &imap, | |
4211 | &nimap, NULL); | |
4212 | if (error || nimap < 1) | |
4213 | break; | |
4214 | ASSERT(imap.br_blockcount >= 1); | |
4215 | ASSERT(imap.br_startoff == offset_fsb); | |
4216 | lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; | |
4217 | if (lastoffset > endoff) | |
4218 | lastoffset = endoff; | |
4219 | if (imap.br_startblock == HOLESTARTBLOCK) | |
4220 | continue; | |
4221 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
4222 | if (imap.br_state == XFS_EXT_UNWRITTEN) | |
4223 | continue; | |
4224 | XFS_BUF_UNDONE(bp); | |
4225 | XFS_BUF_UNWRITE(bp); | |
4226 | XFS_BUF_READ(bp); | |
4227 | XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock)); | |
4228 | xfsbdstrat(mp, bp); | |
4229 | if ((error = xfs_iowait(bp))) { | |
4230 | xfs_ioerror_alert("xfs_zero_remaining_bytes(read)", | |
4231 | mp, bp, XFS_BUF_ADDR(bp)); | |
4232 | break; | |
4233 | } | |
4234 | memset(XFS_BUF_PTR(bp) + | |
4235 | (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), | |
4236 | 0, lastoffset - offset + 1); | |
4237 | XFS_BUF_UNDONE(bp); | |
4238 | XFS_BUF_UNREAD(bp); | |
4239 | XFS_BUF_WRITE(bp); | |
4240 | xfsbdstrat(mp, bp); | |
4241 | if ((error = xfs_iowait(bp))) { | |
4242 | xfs_ioerror_alert("xfs_zero_remaining_bytes(write)", | |
4243 | mp, bp, XFS_BUF_ADDR(bp)); | |
4244 | break; | |
4245 | } | |
4246 | } | |
4247 | xfs_buf_free(bp); | |
4248 | return error; | |
4249 | } | |
4250 | ||
4251 | /* | |
4252 | * xfs_free_file_space() | |
4253 | * This routine frees disk space for the given file. | |
4254 | * | |
4255 | * This routine is only called by xfs_change_file_space | |
4256 | * for an UNRESVSP type call. | |
4257 | * | |
4258 | * RETURNS: | |
4259 | * 0 on success | |
4260 | * errno on error | |
4261 | * | |
4262 | */ | |
4263 | STATIC int | |
4264 | xfs_free_file_space( | |
4265 | xfs_inode_t *ip, | |
4266 | xfs_off_t offset, | |
4267 | xfs_off_t len, | |
4268 | int attr_flags) | |
4269 | { | |
bd5a876a | 4270 | vnode_t *vp; |
1da177e4 LT |
4271 | int committed; |
4272 | int done; | |
4273 | xfs_off_t end_dmi_offset; | |
4274 | xfs_fileoff_t endoffset_fsb; | |
4275 | int error; | |
4276 | xfs_fsblock_t firstfsb; | |
4277 | xfs_bmap_free_t free_list; | |
4278 | xfs_off_t ilen; | |
4279 | xfs_bmbt_irec_t imap; | |
4280 | xfs_off_t ioffset; | |
4281 | xfs_extlen_t mod=0; | |
4282 | xfs_mount_t *mp; | |
4283 | int nimap; | |
4284 | uint resblks; | |
4285 | int rounding; | |
4286 | int rt; | |
4287 | xfs_fileoff_t startoffset_fsb; | |
4288 | xfs_trans_t *tp; | |
5fcbab35 | 4289 | int need_iolock = 1; |
1da177e4 | 4290 | |
bd5a876a | 4291 | vp = XFS_ITOV(ip); |
1da177e4 LT |
4292 | mp = ip->i_mount; |
4293 | ||
bd5a876a CH |
4294 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); |
4295 | ||
1da177e4 LT |
4296 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) |
4297 | return error; | |
4298 | ||
4299 | error = 0; | |
4300 | if (len <= 0) /* if nothing being freed */ | |
4301 | return error; | |
4302 | rt = (ip->i_d.di_flags & XFS_DIFLAG_REALTIME); | |
4303 | startoffset_fsb = XFS_B_TO_FSB(mp, offset); | |
4304 | end_dmi_offset = offset + len; | |
4305 | endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset); | |
4306 | ||
4307 | if (offset < ip->i_d.di_size && | |
4308 | (attr_flags & ATTR_DMI) == 0 && | |
4309 | DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) { | |
4310 | if (end_dmi_offset > ip->i_d.di_size) | |
4311 | end_dmi_offset = ip->i_d.di_size; | |
bd5a876a | 4312 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, vp, |
1da177e4 LT |
4313 | offset, end_dmi_offset - offset, |
4314 | AT_DELAY_FLAG(attr_flags), NULL); | |
4315 | if (error) | |
4316 | return(error); | |
4317 | } | |
4318 | ||
5fcbab35 DR |
4319 | ASSERT(attr_flags & ATTR_NOLOCK ? attr_flags & ATTR_DMI : 1); |
4320 | if (attr_flags & ATTR_NOLOCK) | |
4321 | need_iolock = 0; | |
1da177e4 LT |
4322 | if (need_iolock) |
4323 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
5fcbab35 | 4324 | |
1da177e4 LT |
4325 | rounding = MAX((__uint8_t)(1 << mp->m_sb.sb_blocklog), |
4326 | (__uint8_t)NBPP); | |
4327 | ilen = len + (offset & (rounding - 1)); | |
4328 | ioffset = offset & ~(rounding - 1); | |
4329 | if (ilen & (rounding - 1)) | |
4330 | ilen = (ilen + rounding) & ~(rounding - 1); | |
bd5a876a CH |
4331 | |
4332 | if (VN_CACHED(vp) != 0) { | |
4333 | xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1, | |
4334 | ctooff(offtoct(ioffset)), -1); | |
4335 | VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(ioffset)), | |
4336 | -1, FI_REMAPF_LOCKED); | |
4337 | } | |
4338 | ||
1da177e4 LT |
4339 | /* |
4340 | * Need to zero the stuff we're not freeing, on disk. | |
4341 | * If its a realtime file & can't use unwritten extents then we | |
4342 | * actually need to zero the extent edges. Otherwise xfs_bunmapi | |
4343 | * will take care of it for us. | |
4344 | */ | |
4345 | if (rt && !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) { | |
4346 | nimap = 1; | |
4347 | error = xfs_bmapi(NULL, ip, startoffset_fsb, 1, 0, NULL, 0, | |
4348 | &imap, &nimap, NULL); | |
4349 | if (error) | |
4350 | goto out_unlock_iolock; | |
4351 | ASSERT(nimap == 0 || nimap == 1); | |
4352 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
4353 | xfs_daddr_t block; | |
4354 | ||
4355 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
4356 | block = imap.br_startblock; | |
4357 | mod = do_div(block, mp->m_sb.sb_rextsize); | |
4358 | if (mod) | |
4359 | startoffset_fsb += mp->m_sb.sb_rextsize - mod; | |
4360 | } | |
4361 | nimap = 1; | |
4362 | error = xfs_bmapi(NULL, ip, endoffset_fsb - 1, 1, 0, NULL, 0, | |
4363 | &imap, &nimap, NULL); | |
4364 | if (error) | |
4365 | goto out_unlock_iolock; | |
4366 | ASSERT(nimap == 0 || nimap == 1); | |
4367 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
4368 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
4369 | mod++; | |
4370 | if (mod && (mod != mp->m_sb.sb_rextsize)) | |
4371 | endoffset_fsb -= mod; | |
4372 | } | |
4373 | } | |
4374 | if ((done = (endoffset_fsb <= startoffset_fsb))) | |
4375 | /* | |
4376 | * One contiguous piece to clear | |
4377 | */ | |
4378 | error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); | |
4379 | else { | |
4380 | /* | |
4381 | * Some full blocks, possibly two pieces to clear | |
4382 | */ | |
4383 | if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) | |
4384 | error = xfs_zero_remaining_bytes(ip, offset, | |
4385 | XFS_FSB_TO_B(mp, startoffset_fsb) - 1); | |
4386 | if (!error && | |
4387 | XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) | |
4388 | error = xfs_zero_remaining_bytes(ip, | |
4389 | XFS_FSB_TO_B(mp, endoffset_fsb), | |
4390 | offset + len - 1); | |
4391 | } | |
4392 | ||
4393 | /* | |
4394 | * free file space until done or until there is an error | |
4395 | */ | |
4396 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
4397 | while (!error && !done) { | |
4398 | ||
4399 | /* | |
4400 | * allocate and setup the transaction | |
4401 | */ | |
4402 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
4403 | error = xfs_trans_reserve(tp, | |
4404 | resblks, | |
4405 | XFS_WRITE_LOG_RES(mp), | |
4406 | 0, | |
4407 | XFS_TRANS_PERM_LOG_RES, | |
4408 | XFS_WRITE_LOG_COUNT); | |
4409 | ||
4410 | /* | |
4411 | * check for running out of space | |
4412 | */ | |
4413 | if (error) { | |
4414 | /* | |
4415 | * Free the transaction structure. | |
4416 | */ | |
4417 | ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
4418 | xfs_trans_cancel(tp, 0); | |
4419 | break; | |
4420 | } | |
4421 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
4422 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, | |
4423 | ip->i_udquot, ip->i_gdquot, resblks, 0, rt ? | |
4424 | XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS); | |
4425 | if (error) | |
4426 | goto error1; | |
4427 | ||
4428 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
4429 | xfs_trans_ihold(tp, ip); | |
4430 | ||
4431 | /* | |
4432 | * issue the bunmapi() call to free the blocks | |
4433 | */ | |
4434 | XFS_BMAP_INIT(&free_list, &firstfsb); | |
4435 | error = xfs_bunmapi(tp, ip, startoffset_fsb, | |
4436 | endoffset_fsb - startoffset_fsb, | |
4437 | 0, 2, &firstfsb, &free_list, &done); | |
4438 | if (error) { | |
4439 | goto error0; | |
4440 | } | |
4441 | ||
4442 | /* | |
4443 | * complete the transaction | |
4444 | */ | |
4445 | error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); | |
4446 | if (error) { | |
4447 | goto error0; | |
4448 | } | |
4449 | ||
4450 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
4451 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4452 | } | |
4453 | ||
4454 | out_unlock_iolock: | |
4455 | if (need_iolock) | |
4456 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
4457 | return error; | |
4458 | ||
4459 | error0: | |
4460 | xfs_bmap_cancel(&free_list); | |
4461 | error1: | |
4462 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
4463 | xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) : | |
4464 | XFS_ILOCK_EXCL); | |
4465 | return error; | |
4466 | } | |
4467 | ||
4468 | /* | |
4469 | * xfs_change_file_space() | |
4470 | * This routine allocates or frees disk space for the given file. | |
4471 | * The user specified parameters are checked for alignment and size | |
4472 | * limitations. | |
4473 | * | |
4474 | * RETURNS: | |
4475 | * 0 on success | |
4476 | * errno on error | |
4477 | * | |
4478 | */ | |
4479 | int | |
4480 | xfs_change_file_space( | |
4481 | bhv_desc_t *bdp, | |
4482 | int cmd, | |
4483 | xfs_flock64_t *bf, | |
4484 | xfs_off_t offset, | |
4485 | cred_t *credp, | |
4486 | int attr_flags) | |
4487 | { | |
4488 | int clrprealloc; | |
4489 | int error; | |
4490 | xfs_fsize_t fsize; | |
4491 | xfs_inode_t *ip; | |
4492 | xfs_mount_t *mp; | |
4493 | int setprealloc; | |
4494 | xfs_off_t startoffset; | |
4495 | xfs_off_t llen; | |
4496 | xfs_trans_t *tp; | |
4497 | vattr_t va; | |
4498 | vnode_t *vp; | |
4499 | ||
4500 | vp = BHV_TO_VNODE(bdp); | |
4501 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
4502 | ||
4503 | ip = XFS_BHVTOI(bdp); | |
4504 | mp = ip->i_mount; | |
4505 | ||
4506 | /* | |
4507 | * must be a regular file and have write permission | |
4508 | */ | |
0432dab2 | 4509 | if (!VN_ISREG(vp)) |
1da177e4 LT |
4510 | return XFS_ERROR(EINVAL); |
4511 | ||
4512 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
4513 | ||
4514 | if ((error = xfs_iaccess(ip, S_IWUSR, credp))) { | |
4515 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
4516 | return error; | |
4517 | } | |
4518 | ||
4519 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
4520 | ||
4521 | switch (bf->l_whence) { | |
4522 | case 0: /*SEEK_SET*/ | |
4523 | break; | |
4524 | case 1: /*SEEK_CUR*/ | |
4525 | bf->l_start += offset; | |
4526 | break; | |
4527 | case 2: /*SEEK_END*/ | |
4528 | bf->l_start += ip->i_d.di_size; | |
4529 | break; | |
4530 | default: | |
4531 | return XFS_ERROR(EINVAL); | |
4532 | } | |
4533 | ||
4534 | llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len; | |
4535 | ||
4536 | if ( (bf->l_start < 0) | |
4537 | || (bf->l_start > XFS_MAXIOFFSET(mp)) | |
4538 | || (bf->l_start + llen < 0) | |
4539 | || (bf->l_start + llen > XFS_MAXIOFFSET(mp))) | |
4540 | return XFS_ERROR(EINVAL); | |
4541 | ||
4542 | bf->l_whence = 0; | |
4543 | ||
4544 | startoffset = bf->l_start; | |
4545 | fsize = ip->i_d.di_size; | |
4546 | ||
4547 | /* | |
4548 | * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve | |
4549 | * file space. | |
4550 | * These calls do NOT zero the data space allocated to the file, | |
4551 | * nor do they change the file size. | |
4552 | * | |
4553 | * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file | |
4554 | * space. | |
4555 | * These calls cause the new file data to be zeroed and the file | |
4556 | * size to be changed. | |
4557 | */ | |
4558 | setprealloc = clrprealloc = 0; | |
4559 | ||
4560 | switch (cmd) { | |
4561 | case XFS_IOC_RESVSP: | |
4562 | case XFS_IOC_RESVSP64: | |
4563 | error = xfs_alloc_file_space(ip, startoffset, bf->l_len, | |
4564 | 1, attr_flags); | |
4565 | if (error) | |
4566 | return error; | |
4567 | setprealloc = 1; | |
4568 | break; | |
4569 | ||
4570 | case XFS_IOC_UNRESVSP: | |
4571 | case XFS_IOC_UNRESVSP64: | |
4572 | if ((error = xfs_free_file_space(ip, startoffset, bf->l_len, | |
4573 | attr_flags))) | |
4574 | return error; | |
4575 | break; | |
4576 | ||
4577 | case XFS_IOC_ALLOCSP: | |
4578 | case XFS_IOC_ALLOCSP64: | |
4579 | case XFS_IOC_FREESP: | |
4580 | case XFS_IOC_FREESP64: | |
4581 | if (startoffset > fsize) { | |
4582 | error = xfs_alloc_file_space(ip, fsize, | |
4583 | startoffset - fsize, 0, attr_flags); | |
4584 | if (error) | |
4585 | break; | |
4586 | } | |
4587 | ||
4588 | va.va_mask = XFS_AT_SIZE; | |
4589 | va.va_size = startoffset; | |
4590 | ||
4591 | error = xfs_setattr(bdp, &va, attr_flags, credp); | |
4592 | ||
4593 | if (error) | |
4594 | return error; | |
4595 | ||
4596 | clrprealloc = 1; | |
4597 | break; | |
4598 | ||
4599 | default: | |
4600 | ASSERT(0); | |
4601 | return XFS_ERROR(EINVAL); | |
4602 | } | |
4603 | ||
4604 | /* | |
4605 | * update the inode timestamp, mode, and prealloc flag bits | |
4606 | */ | |
4607 | tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID); | |
4608 | ||
4609 | if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp), | |
4610 | 0, 0, 0))) { | |
4611 | /* ASSERT(0); */ | |
4612 | xfs_trans_cancel(tp, 0); | |
4613 | return error; | |
4614 | } | |
4615 | ||
4616 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
4617 | ||
4618 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
4619 | xfs_trans_ihold(tp, ip); | |
4620 | ||
4621 | if ((attr_flags & ATTR_DMI) == 0) { | |
4622 | ip->i_d.di_mode &= ~S_ISUID; | |
4623 | ||
4624 | /* | |
4625 | * Note that we don't have to worry about mandatory | |
4626 | * file locking being disabled here because we only | |
4627 | * clear the S_ISGID bit if the Group execute bit is | |
4628 | * on, but if it was on then mandatory locking wouldn't | |
4629 | * have been enabled. | |
4630 | */ | |
4631 | if (ip->i_d.di_mode & S_IXGRP) | |
4632 | ip->i_d.di_mode &= ~S_ISGID; | |
4633 | ||
4634 | xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
4635 | } | |
4636 | if (setprealloc) | |
4637 | ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; | |
4638 | else if (clrprealloc) | |
4639 | ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; | |
4640 | ||
4641 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
4642 | xfs_trans_set_sync(tp); | |
4643 | ||
4644 | error = xfs_trans_commit(tp, 0, NULL); | |
4645 | ||
4646 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4647 | ||
4648 | return error; | |
4649 | } | |
4650 | ||
4651 | vnodeops_t xfs_vnodeops = { | |
4652 | BHV_IDENTITY_INIT(VN_BHV_XFS,VNODE_POSITION_XFS), | |
4653 | .vop_open = xfs_open, | |
4654 | .vop_read = xfs_read, | |
4655 | #ifdef HAVE_SENDFILE | |
4656 | .vop_sendfile = xfs_sendfile, | |
4657 | #endif | |
4658 | .vop_write = xfs_write, | |
4659 | .vop_ioctl = xfs_ioctl, | |
4660 | .vop_getattr = xfs_getattr, | |
4661 | .vop_setattr = xfs_setattr, | |
4662 | .vop_access = xfs_access, | |
4663 | .vop_lookup = xfs_lookup, | |
4664 | .vop_create = xfs_create, | |
4665 | .vop_remove = xfs_remove, | |
4666 | .vop_link = xfs_link, | |
4667 | .vop_rename = xfs_rename, | |
4668 | .vop_mkdir = xfs_mkdir, | |
4669 | .vop_rmdir = xfs_rmdir, | |
4670 | .vop_readdir = xfs_readdir, | |
4671 | .vop_symlink = xfs_symlink, | |
4672 | .vop_readlink = xfs_readlink, | |
4673 | .vop_fsync = xfs_fsync, | |
4674 | .vop_inactive = xfs_inactive, | |
4675 | .vop_fid2 = xfs_fid2, | |
4676 | .vop_rwlock = xfs_rwlock, | |
4677 | .vop_rwunlock = xfs_rwunlock, | |
4678 | .vop_bmap = xfs_bmap, | |
4679 | .vop_reclaim = xfs_reclaim, | |
4680 | .vop_attr_get = xfs_attr_get, | |
4681 | .vop_attr_set = xfs_attr_set, | |
4682 | .vop_attr_remove = xfs_attr_remove, | |
4683 | .vop_attr_list = xfs_attr_list, | |
4684 | .vop_link_removed = (vop_link_removed_t)fs_noval, | |
4685 | .vop_vnode_change = (vop_vnode_change_t)fs_noval, | |
4686 | .vop_tosspages = fs_tosspages, | |
4687 | .vop_flushinval_pages = fs_flushinval_pages, | |
4688 | .vop_flush_pages = fs_flush_pages, | |
4689 | .vop_release = xfs_release, | |
4690 | .vop_iflush = xfs_inode_flush, | |
4691 | }; |