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1 | /* | |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | #include "xfs.h" | |
34 | #include "xfs_macros.h" | |
35 | #include "xfs_types.h" | |
36 | #include "xfs_inum.h" | |
37 | #include "xfs_log.h" | |
38 | #include "xfs_trans.h" | |
39 | #include "xfs_sb.h" | |
40 | #include "xfs_ag.h" | |
41 | #include "xfs_dir.h" | |
42 | #include "xfs_dir2.h" | |
43 | #include "xfs_dmapi.h" | |
44 | #include "xfs_mount.h" | |
45 | #include "xfs_alloc_btree.h" | |
46 | #include "xfs_bmap_btree.h" | |
47 | #include "xfs_ialloc_btree.h" | |
48 | #include "xfs_itable.h" | |
49 | #include "xfs_btree.h" | |
50 | #include "xfs_ialloc.h" | |
51 | #include "xfs_alloc.h" | |
52 | #include "xfs_attr_sf.h" | |
53 | #include "xfs_dir_sf.h" | |
54 | #include "xfs_dir2_sf.h" | |
55 | #include "xfs_dinode.h" | |
56 | #include "xfs_inode_item.h" | |
57 | #include "xfs_inode.h" | |
58 | #include "xfs_bmap.h" | |
59 | #include "xfs_da_btree.h" | |
60 | #include "xfs_attr.h" | |
61 | #include "xfs_rw.h" | |
62 | #include "xfs_refcache.h" | |
63 | #include "xfs_error.h" | |
64 | #include "xfs_bit.h" | |
65 | #include "xfs_rtalloc.h" | |
66 | #include "xfs_quota.h" | |
67 | #include "xfs_utils.h" | |
68 | #include "xfs_trans_space.h" | |
69 | #include "xfs_dir_leaf.h" | |
70 | #include "xfs_mac.h" | |
71 | #include "xfs_log_priv.h" | |
72 | ||
73 | ||
74 | /* | |
75 | * The maximum pathlen is 1024 bytes. Since the minimum file system | |
76 | * blocksize is 512 bytes, we can get a max of 2 extents back from | |
77 | * bmapi. | |
78 | */ | |
79 | #define SYMLINK_MAPS 2 | |
80 | ||
81 | /* | |
82 | * For xfs, we check that the file isn't too big to be opened by this kernel. | |
83 | * No other open action is required for regular files. Devices are handled | |
84 | * through the specfs file system, pipes through fifofs. Device and | |
85 | * fifo vnodes are "wrapped" by specfs and fifofs vnodes, respectively, | |
86 | * when a new vnode is first looked up or created. | |
87 | */ | |
88 | STATIC int | |
89 | xfs_open( | |
90 | bhv_desc_t *bdp, | |
91 | cred_t *credp) | |
92 | { | |
93 | int mode; | |
94 | vnode_t *vp; | |
95 | xfs_inode_t *ip; | |
96 | ||
97 | vp = BHV_TO_VNODE(bdp); | |
98 | ip = XFS_BHVTOI(bdp); | |
99 | ||
100 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
101 | return XFS_ERROR(EIO); | |
102 | ||
103 | /* | |
104 | * If it's a directory with any blocks, read-ahead block 0 | |
105 | * as we're almost certain to have the next operation be a read there. | |
106 | */ | |
107 | if (vp->v_type == VDIR && ip->i_d.di_nextents > 0) { | |
108 | mode = xfs_ilock_map_shared(ip); | |
109 | if (ip->i_d.di_nextents > 0) | |
110 | (void)xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK); | |
111 | xfs_iunlock(ip, mode); | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
116 | ||
117 | /* | |
118 | * xfs_getattr | |
119 | */ | |
120 | STATIC int | |
121 | xfs_getattr( | |
122 | bhv_desc_t *bdp, | |
123 | vattr_t *vap, | |
124 | int flags, | |
125 | cred_t *credp) | |
126 | { | |
127 | xfs_inode_t *ip; | |
128 | xfs_mount_t *mp; | |
129 | vnode_t *vp; | |
130 | ||
131 | vp = BHV_TO_VNODE(bdp); | |
132 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
133 | ||
134 | ip = XFS_BHVTOI(bdp); | |
135 | mp = ip->i_mount; | |
136 | ||
137 | if (XFS_FORCED_SHUTDOWN(mp)) | |
138 | return XFS_ERROR(EIO); | |
139 | ||
140 | if (!(flags & ATTR_LAZY)) | |
141 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
142 | ||
143 | vap->va_size = ip->i_d.di_size; | |
144 | if (vap->va_mask == XFS_AT_SIZE) | |
145 | goto all_done; | |
146 | ||
147 | vap->va_nblocks = | |
148 | XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); | |
149 | vap->va_nodeid = ip->i_ino; | |
150 | #if XFS_BIG_INUMS | |
151 | vap->va_nodeid += mp->m_inoadd; | |
152 | #endif | |
153 | vap->va_nlink = ip->i_d.di_nlink; | |
154 | ||
155 | /* | |
156 | * Quick exit for non-stat callers | |
157 | */ | |
158 | if ((vap->va_mask & | |
159 | ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID| | |
160 | XFS_AT_NLINK|XFS_AT_BLKSIZE)) == 0) | |
161 | goto all_done; | |
162 | ||
163 | /* | |
164 | * Copy from in-core inode. | |
165 | */ | |
166 | vap->va_type = vp->v_type; | |
167 | vap->va_mode = ip->i_d.di_mode & MODEMASK; | |
168 | vap->va_uid = ip->i_d.di_uid; | |
169 | vap->va_gid = ip->i_d.di_gid; | |
170 | vap->va_projid = ip->i_d.di_projid; | |
171 | ||
172 | /* | |
173 | * Check vnode type block/char vs. everything else. | |
174 | * Do it with bitmask because that's faster than looking | |
175 | * for multiple values individually. | |
176 | */ | |
177 | if (((1 << vp->v_type) & ((1<<VBLK) | (1<<VCHR))) == 0) { | |
178 | vap->va_rdev = 0; | |
179 | ||
180 | if (!(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) { | |
181 | ||
182 | #if 0 | |
183 | /* Large block sizes confuse various | |
184 | * user space programs, so letting the | |
185 | * stripe size through is not a good | |
186 | * idea for now. | |
187 | */ | |
188 | vap->va_blocksize = mp->m_swidth ? | |
189 | /* | |
190 | * If the underlying volume is a stripe, then | |
191 | * return the stripe width in bytes as the | |
192 | * recommended I/O size. | |
193 | */ | |
194 | (mp->m_swidth << mp->m_sb.sb_blocklog) : | |
195 | /* | |
196 | * Return the largest of the preferred buffer | |
197 | * sizes since doing small I/Os into larger | |
198 | * buffers causes buffers to be decommissioned. | |
199 | * The value returned is in bytes. | |
200 | */ | |
201 | (1 << (int)MAX(mp->m_readio_log, | |
202 | mp->m_writeio_log)); | |
203 | ||
204 | #else | |
205 | vap->va_blocksize = | |
206 | /* | |
207 | * Return the largest of the preferred buffer | |
208 | * sizes since doing small I/Os into larger | |
209 | * buffers causes buffers to be decommissioned. | |
210 | * The value returned is in bytes. | |
211 | */ | |
212 | 1 << (int)MAX(mp->m_readio_log, | |
213 | mp->m_writeio_log); | |
214 | #endif | |
215 | } else { | |
216 | ||
217 | /* | |
218 | * If the file blocks are being allocated from a | |
219 | * realtime partition, then return the inode's | |
220 | * realtime extent size or the realtime volume's | |
221 | * extent size. | |
222 | */ | |
223 | vap->va_blocksize = ip->i_d.di_extsize ? | |
224 | (ip->i_d.di_extsize << mp->m_sb.sb_blocklog) : | |
225 | (mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog); | |
226 | } | |
227 | } else { | |
228 | vap->va_rdev = ip->i_df.if_u2.if_rdev; | |
229 | vap->va_blocksize = BLKDEV_IOSIZE; | |
230 | } | |
231 | ||
232 | vap->va_atime.tv_sec = ip->i_d.di_atime.t_sec; | |
233 | vap->va_atime.tv_nsec = ip->i_d.di_atime.t_nsec; | |
234 | vap->va_mtime.tv_sec = ip->i_d.di_mtime.t_sec; | |
235 | vap->va_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; | |
236 | vap->va_ctime.tv_sec = ip->i_d.di_ctime.t_sec; | |
237 | vap->va_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; | |
238 | ||
239 | /* | |
240 | * Exit for stat callers. See if any of the rest of the fields | |
241 | * to be filled in are needed. | |
242 | */ | |
243 | if ((vap->va_mask & | |
244 | (XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS| | |
245 | XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0) | |
246 | goto all_done; | |
247 | ||
248 | /* | |
249 | * Convert di_flags to xflags. | |
250 | */ | |
251 | vap->va_xflags = xfs_ip2xflags(ip); | |
252 | ||
253 | /* | |
254 | * Exit for inode revalidate. See if any of the rest of | |
255 | * the fields to be filled in are needed. | |
256 | */ | |
257 | if ((vap->va_mask & | |
258 | (XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS| | |
259 | XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0) | |
260 | goto all_done; | |
261 | ||
262 | vap->va_extsize = ip->i_d.di_extsize << mp->m_sb.sb_blocklog; | |
263 | vap->va_nextents = | |
264 | (ip->i_df.if_flags & XFS_IFEXTENTS) ? | |
265 | ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) : | |
266 | ip->i_d.di_nextents; | |
267 | if (ip->i_afp) | |
268 | vap->va_anextents = | |
269 | (ip->i_afp->if_flags & XFS_IFEXTENTS) ? | |
270 | ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) : | |
271 | ip->i_d.di_anextents; | |
272 | else | |
273 | vap->va_anextents = 0; | |
274 | vap->va_gen = ip->i_d.di_gen; | |
275 | ||
276 | all_done: | |
277 | if (!(flags & ATTR_LAZY)) | |
278 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | ||
283 | /* | |
284 | * xfs_setattr | |
285 | */ | |
286 | int | |
287 | xfs_setattr( | |
288 | bhv_desc_t *bdp, | |
289 | vattr_t *vap, | |
290 | int flags, | |
291 | cred_t *credp) | |
292 | { | |
293 | xfs_inode_t *ip; | |
294 | xfs_trans_t *tp; | |
295 | xfs_mount_t *mp; | |
296 | int mask; | |
297 | int code; | |
298 | uint lock_flags; | |
299 | uint commit_flags=0; | |
300 | uid_t uid=0, iuid=0; | |
301 | gid_t gid=0, igid=0; | |
302 | int timeflags = 0; | |
303 | vnode_t *vp; | |
304 | xfs_prid_t projid=0, iprojid=0; | |
305 | int mandlock_before, mandlock_after; | |
306 | struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2; | |
307 | int file_owner; | |
308 | int need_iolock = 1; | |
309 | ||
310 | vp = BHV_TO_VNODE(bdp); | |
311 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
312 | ||
313 | if (vp->v_vfsp->vfs_flag & VFS_RDONLY) | |
314 | return XFS_ERROR(EROFS); | |
315 | ||
316 | /* | |
317 | * Cannot set certain attributes. | |
318 | */ | |
319 | mask = vap->va_mask; | |
320 | if (mask & XFS_AT_NOSET) { | |
321 | return XFS_ERROR(EINVAL); | |
322 | } | |
323 | ||
324 | ip = XFS_BHVTOI(bdp); | |
325 | mp = ip->i_mount; | |
326 | ||
327 | if (XFS_FORCED_SHUTDOWN(mp)) | |
328 | return XFS_ERROR(EIO); | |
329 | ||
330 | /* | |
331 | * Timestamps do not need to be logged and hence do not | |
332 | * need to be done within a transaction. | |
333 | */ | |
334 | if (mask & XFS_AT_UPDTIMES) { | |
335 | ASSERT((mask & ~XFS_AT_UPDTIMES) == 0); | |
336 | timeflags = ((mask & XFS_AT_UPDATIME) ? XFS_ICHGTIME_ACC : 0) | | |
337 | ((mask & XFS_AT_UPDCTIME) ? XFS_ICHGTIME_CHG : 0) | | |
338 | ((mask & XFS_AT_UPDMTIME) ? XFS_ICHGTIME_MOD : 0); | |
339 | xfs_ichgtime(ip, timeflags); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | olddquot1 = olddquot2 = NULL; | |
344 | udqp = gdqp = NULL; | |
345 | ||
346 | /* | |
347 | * If disk quotas is on, we make sure that the dquots do exist on disk, | |
348 | * before we start any other transactions. Trying to do this later | |
349 | * is messy. We don't care to take a readlock to look at the ids | |
350 | * in inode here, because we can't hold it across the trans_reserve. | |
351 | * If the IDs do change before we take the ilock, we're covered | |
352 | * because the i_*dquot fields will get updated anyway. | |
353 | */ | |
354 | if (XFS_IS_QUOTA_ON(mp) && | |
355 | (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID))) { | |
356 | uint qflags = 0; | |
357 | ||
358 | if ((mask & XFS_AT_UID) && XFS_IS_UQUOTA_ON(mp)) { | |
359 | uid = vap->va_uid; | |
360 | qflags |= XFS_QMOPT_UQUOTA; | |
361 | } else { | |
362 | uid = ip->i_d.di_uid; | |
363 | } | |
364 | if ((mask & XFS_AT_GID) && XFS_IS_GQUOTA_ON(mp)) { | |
365 | gid = vap->va_gid; | |
366 | qflags |= XFS_QMOPT_GQUOTA; | |
367 | } else { | |
368 | gid = ip->i_d.di_gid; | |
369 | } | |
370 | if ((mask & XFS_AT_PROJID) && XFS_IS_PQUOTA_ON(mp)) { | |
371 | projid = vap->va_projid; | |
372 | qflags |= XFS_QMOPT_PQUOTA; | |
373 | } else { | |
374 | projid = ip->i_d.di_projid; | |
375 | } | |
376 | /* | |
377 | * We take a reference when we initialize udqp and gdqp, | |
378 | * so it is important that we never blindly double trip on | |
379 | * the same variable. See xfs_create() for an example. | |
380 | */ | |
381 | ASSERT(udqp == NULL); | |
382 | ASSERT(gdqp == NULL); | |
383 | code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, projid, qflags, | |
384 | &udqp, &gdqp); | |
385 | if (code) | |
386 | return (code); | |
387 | } | |
388 | ||
389 | /* | |
390 | * For the other attributes, we acquire the inode lock and | |
391 | * first do an error checking pass. | |
392 | */ | |
393 | tp = NULL; | |
394 | lock_flags = XFS_ILOCK_EXCL; | |
395 | ASSERT(flags & ATTR_NOLOCK ? flags & ATTR_DMI : 1); | |
396 | if (flags & ATTR_NOLOCK) | |
397 | need_iolock = 0; | |
398 | if (!(mask & XFS_AT_SIZE)) { | |
399 | if ((mask != (XFS_AT_CTIME|XFS_AT_ATIME|XFS_AT_MTIME)) || | |
400 | (mp->m_flags & XFS_MOUNT_WSYNC)) { | |
401 | tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); | |
402 | commit_flags = 0; | |
403 | if ((code = xfs_trans_reserve(tp, 0, | |
404 | XFS_ICHANGE_LOG_RES(mp), 0, | |
405 | 0, 0))) { | |
406 | lock_flags = 0; | |
407 | goto error_return; | |
408 | } | |
409 | } | |
410 | } else { | |
411 | if (DM_EVENT_ENABLED (vp->v_vfsp, ip, DM_EVENT_TRUNCATE) && | |
412 | !(flags & ATTR_DMI)) { | |
413 | int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR; | |
414 | code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, vp, | |
415 | vap->va_size, 0, dmflags, NULL); | |
416 | if (code) { | |
417 | lock_flags = 0; | |
418 | goto error_return; | |
419 | } | |
420 | } | |
421 | if (need_iolock) | |
422 | lock_flags |= XFS_IOLOCK_EXCL; | |
423 | } | |
424 | ||
425 | xfs_ilock(ip, lock_flags); | |
426 | ||
427 | /* boolean: are we the file owner? */ | |
428 | file_owner = (current_fsuid(credp) == ip->i_d.di_uid); | |
429 | ||
430 | /* | |
431 | * Change various properties of a file. | |
432 | * Only the owner or users with CAP_FOWNER | |
433 | * capability may do these things. | |
434 | */ | |
435 | if (mask & | |
436 | (XFS_AT_MODE|XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_UID| | |
437 | XFS_AT_GID|XFS_AT_PROJID)) { | |
438 | /* | |
439 | * CAP_FOWNER overrides the following restrictions: | |
440 | * | |
441 | * The user ID of the calling process must be equal | |
442 | * to the file owner ID, except in cases where the | |
443 | * CAP_FSETID capability is applicable. | |
444 | */ | |
445 | if (!file_owner && !capable(CAP_FOWNER)) { | |
446 | code = XFS_ERROR(EPERM); | |
447 | goto error_return; | |
448 | } | |
449 | ||
450 | /* | |
451 | * CAP_FSETID overrides the following restrictions: | |
452 | * | |
453 | * The effective user ID of the calling process shall match | |
454 | * the file owner when setting the set-user-ID and | |
455 | * set-group-ID bits on that file. | |
456 | * | |
457 | * The effective group ID or one of the supplementary group | |
458 | * IDs of the calling process shall match the group owner of | |
459 | * the file when setting the set-group-ID bit on that file | |
460 | */ | |
461 | if (mask & XFS_AT_MODE) { | |
462 | mode_t m = 0; | |
463 | ||
464 | if ((vap->va_mode & S_ISUID) && !file_owner) | |
465 | m |= S_ISUID; | |
466 | if ((vap->va_mode & S_ISGID) && | |
467 | !in_group_p((gid_t)ip->i_d.di_gid)) | |
468 | m |= S_ISGID; | |
469 | #if 0 | |
470 | /* Linux allows this, Irix doesn't. */ | |
471 | if ((vap->va_mode & S_ISVTX) && vp->v_type != VDIR) | |
472 | m |= S_ISVTX; | |
473 | #endif | |
474 | if (m && !capable(CAP_FSETID)) | |
475 | vap->va_mode &= ~m; | |
476 | } | |
477 | } | |
478 | ||
479 | /* | |
480 | * Change file ownership. Must be the owner or privileged. | |
481 | * If the system was configured with the "restricted_chown" | |
482 | * option, the owner is not permitted to give away the file, | |
483 | * and can change the group id only to a group of which he | |
484 | * or she is a member. | |
485 | */ | |
486 | if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) { | |
487 | /* | |
488 | * These IDs could have changed since we last looked at them. | |
489 | * But, we're assured that if the ownership did change | |
490 | * while we didn't have the inode locked, inode's dquot(s) | |
491 | * would have changed also. | |
492 | */ | |
493 | iuid = ip->i_d.di_uid; | |
494 | iprojid = ip->i_d.di_projid; | |
495 | igid = ip->i_d.di_gid; | |
496 | gid = (mask & XFS_AT_GID) ? vap->va_gid : igid; | |
497 | uid = (mask & XFS_AT_UID) ? vap->va_uid : iuid; | |
498 | projid = (mask & XFS_AT_PROJID) ? (xfs_prid_t)vap->va_projid : | |
499 | iprojid; | |
500 | ||
501 | /* | |
502 | * CAP_CHOWN overrides the following restrictions: | |
503 | * | |
504 | * If _POSIX_CHOWN_RESTRICTED is defined, this capability | |
505 | * shall override the restriction that a process cannot | |
506 | * change the user ID of a file it owns and the restriction | |
507 | * that the group ID supplied to the chown() function | |
508 | * shall be equal to either the group ID or one of the | |
509 | * supplementary group IDs of the calling process. | |
510 | */ | |
511 | if (restricted_chown && | |
512 | (iuid != uid || (igid != gid && | |
513 | !in_group_p((gid_t)gid))) && | |
514 | !capable(CAP_CHOWN)) { | |
515 | code = XFS_ERROR(EPERM); | |
516 | goto error_return; | |
517 | } | |
518 | /* | |
519 | * Do a quota reservation only if uid/projid/gid is actually | |
520 | * going to change. | |
521 | */ | |
522 | if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) || | |
523 | (XFS_IS_PQUOTA_ON(mp) && iprojid != projid) || | |
524 | (XFS_IS_GQUOTA_ON(mp) && igid != gid)) { | |
525 | ASSERT(tp); | |
526 | code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp, | |
527 | capable(CAP_FOWNER) ? | |
528 | XFS_QMOPT_FORCE_RES : 0); | |
529 | if (code) /* out of quota */ | |
530 | goto error_return; | |
531 | } | |
532 | } | |
533 | ||
534 | /* | |
535 | * Truncate file. Must have write permission and not be a directory. | |
536 | */ | |
537 | if (mask & XFS_AT_SIZE) { | |
538 | /* Short circuit the truncate case for zero length files */ | |
539 | if ((vap->va_size == 0) && | |
540 | (ip->i_d.di_size == 0) && (ip->i_d.di_nextents == 0)) { | |
541 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
542 | lock_flags &= ~XFS_ILOCK_EXCL; | |
543 | if (mask & XFS_AT_CTIME) | |
544 | xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
545 | code = 0; | |
546 | goto error_return; | |
547 | } | |
548 | ||
549 | if (vp->v_type == VDIR) { | |
550 | code = XFS_ERROR(EISDIR); | |
551 | goto error_return; | |
552 | } else if (vp->v_type != VREG) { | |
553 | code = XFS_ERROR(EINVAL); | |
554 | goto error_return; | |
555 | } | |
556 | /* | |
557 | * Make sure that the dquots are attached to the inode. | |
558 | */ | |
559 | if ((code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED))) | |
560 | goto error_return; | |
561 | } | |
562 | ||
563 | /* | |
564 | * Change file access or modified times. | |
565 | */ | |
566 | if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) { | |
567 | if (!file_owner) { | |
568 | if ((flags & ATTR_UTIME) && | |
569 | !capable(CAP_FOWNER)) { | |
570 | code = XFS_ERROR(EPERM); | |
571 | goto error_return; | |
572 | } | |
573 | } | |
574 | } | |
575 | ||
576 | /* | |
577 | * Change extent size or realtime flag. | |
578 | */ | |
579 | if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) { | |
580 | /* | |
581 | * Can't change extent size if any extents are allocated. | |
582 | */ | |
583 | if ((ip->i_d.di_nextents || ip->i_delayed_blks) && | |
584 | (mask & XFS_AT_EXTSIZE) && | |
585 | ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != | |
586 | vap->va_extsize) ) { | |
587 | code = XFS_ERROR(EINVAL); /* EFBIG? */ | |
588 | goto error_return; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Can't set extent size unless the file is marked, or | |
593 | * about to be marked as a realtime file. | |
594 | * | |
595 | * This check will be removed when fixed size extents | |
596 | * with buffered data writes is implemented. | |
597 | * | |
598 | */ | |
599 | if ((mask & XFS_AT_EXTSIZE) && | |
600 | ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != | |
601 | vap->va_extsize) && | |
602 | (!((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) || | |
603 | ((mask & XFS_AT_XFLAGS) && | |
604 | (vap->va_xflags & XFS_XFLAG_REALTIME))))) { | |
605 | code = XFS_ERROR(EINVAL); | |
606 | goto error_return; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Can't change realtime flag if any extents are allocated. | |
611 | */ | |
612 | if (ip->i_d.di_nextents && (mask & XFS_AT_XFLAGS) && | |
613 | (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != | |
614 | (vap->va_xflags & XFS_XFLAG_REALTIME)) { | |
615 | code = XFS_ERROR(EINVAL); /* EFBIG? */ | |
616 | goto error_return; | |
617 | } | |
618 | /* | |
619 | * Extent size must be a multiple of the appropriate block | |
620 | * size, if set at all. | |
621 | */ | |
622 | if ((mask & XFS_AT_EXTSIZE) && vap->va_extsize != 0) { | |
623 | xfs_extlen_t size; | |
624 | ||
625 | if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) || | |
626 | ((mask & XFS_AT_XFLAGS) && | |
627 | (vap->va_xflags & XFS_XFLAG_REALTIME))) { | |
628 | size = mp->m_sb.sb_rextsize << | |
629 | mp->m_sb.sb_blocklog; | |
630 | } else { | |
631 | size = mp->m_sb.sb_blocksize; | |
632 | } | |
633 | if (vap->va_extsize % size) { | |
634 | code = XFS_ERROR(EINVAL); | |
635 | goto error_return; | |
636 | } | |
637 | } | |
638 | /* | |
639 | * If realtime flag is set then must have realtime data. | |
640 | */ | |
641 | if ((mask & XFS_AT_XFLAGS) && | |
642 | (vap->va_xflags & XFS_XFLAG_REALTIME)) { | |
643 | if ((mp->m_sb.sb_rblocks == 0) || | |
644 | (mp->m_sb.sb_rextsize == 0) || | |
645 | (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) { | |
646 | code = XFS_ERROR(EINVAL); | |
647 | goto error_return; | |
648 | } | |
649 | } | |
650 | ||
651 | /* | |
652 | * Can't modify an immutable/append-only file unless | |
653 | * we have appropriate permission. | |
654 | */ | |
655 | if ((mask & XFS_AT_XFLAGS) && | |
656 | (ip->i_d.di_flags & | |
657 | (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) || | |
658 | (vap->va_xflags & | |
659 | (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) && | |
660 | !capable(CAP_LINUX_IMMUTABLE)) { | |
661 | code = XFS_ERROR(EPERM); | |
662 | goto error_return; | |
663 | } | |
664 | } | |
665 | ||
666 | /* | |
667 | * Now we can make the changes. Before we join the inode | |
668 | * to the transaction, if XFS_AT_SIZE is set then take care of | |
669 | * the part of the truncation that must be done without the | |
670 | * inode lock. This needs to be done before joining the inode | |
671 | * to the transaction, because the inode cannot be unlocked | |
672 | * once it is a part of the transaction. | |
673 | */ | |
674 | if (mask & XFS_AT_SIZE) { | |
675 | code = 0; | |
676 | if (vap->va_size > ip->i_d.di_size) | |
677 | code = xfs_igrow_start(ip, vap->va_size, credp); | |
678 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
679 | if (!code) | |
680 | code = xfs_itruncate_data(ip, vap->va_size); | |
681 | if (code) { | |
682 | ASSERT(tp == NULL); | |
683 | lock_flags &= ~XFS_ILOCK_EXCL; | |
684 | ASSERT(lock_flags == XFS_IOLOCK_EXCL); | |
685 | goto error_return; | |
686 | } | |
687 | tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); | |
688 | if ((code = xfs_trans_reserve(tp, 0, | |
689 | XFS_ITRUNCATE_LOG_RES(mp), 0, | |
690 | XFS_TRANS_PERM_LOG_RES, | |
691 | XFS_ITRUNCATE_LOG_COUNT))) { | |
692 | xfs_trans_cancel(tp, 0); | |
693 | if (need_iolock) | |
694 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
695 | return code; | |
696 | } | |
697 | commit_flags = XFS_TRANS_RELEASE_LOG_RES; | |
698 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
699 | } | |
700 | ||
701 | if (tp) { | |
702 | xfs_trans_ijoin(tp, ip, lock_flags); | |
703 | xfs_trans_ihold(tp, ip); | |
704 | } | |
705 | ||
706 | /* determine whether mandatory locking mode changes */ | |
707 | mandlock_before = MANDLOCK(vp, ip->i_d.di_mode); | |
708 | ||
709 | /* | |
710 | * Truncate file. Must have write permission and not be a directory. | |
711 | */ | |
712 | if (mask & XFS_AT_SIZE) { | |
713 | if (vap->va_size > ip->i_d.di_size) { | |
714 | xfs_igrow_finish(tp, ip, vap->va_size, | |
715 | !(flags & ATTR_DMI)); | |
716 | } else if ((vap->va_size <= ip->i_d.di_size) || | |
717 | ((vap->va_size == 0) && ip->i_d.di_nextents)) { | |
718 | /* | |
719 | * signal a sync transaction unless | |
720 | * we're truncating an already unlinked | |
721 | * file on a wsync filesystem | |
722 | */ | |
723 | code = xfs_itruncate_finish(&tp, ip, | |
724 | (xfs_fsize_t)vap->va_size, | |
725 | XFS_DATA_FORK, | |
726 | ((ip->i_d.di_nlink != 0 || | |
727 | !(mp->m_flags & XFS_MOUNT_WSYNC)) | |
728 | ? 1 : 0)); | |
729 | if (code) { | |
730 | goto abort_return; | |
731 | } | |
732 | } | |
733 | /* | |
734 | * Have to do this even if the file's size doesn't change. | |
735 | */ | |
736 | timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; | |
737 | } | |
738 | ||
739 | /* | |
740 | * Change file access modes. | |
741 | */ | |
742 | if (mask & XFS_AT_MODE) { | |
743 | ip->i_d.di_mode &= S_IFMT; | |
744 | ip->i_d.di_mode |= vap->va_mode & ~S_IFMT; | |
745 | ||
746 | xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); | |
747 | timeflags |= XFS_ICHGTIME_CHG; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Change file ownership. Must be the owner or privileged. | |
752 | * If the system was configured with the "restricted_chown" | |
753 | * option, the owner is not permitted to give away the file, | |
754 | * and can change the group id only to a group of which he | |
755 | * or she is a member. | |
756 | */ | |
757 | if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) { | |
758 | /* | |
759 | * CAP_FSETID overrides the following restrictions: | |
760 | * | |
761 | * The set-user-ID and set-group-ID bits of a file will be | |
762 | * cleared upon successful return from chown() | |
763 | */ | |
764 | if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && | |
765 | !capable(CAP_FSETID)) { | |
766 | ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); | |
767 | } | |
768 | ||
769 | /* | |
770 | * Change the ownerships and register quota modifications | |
771 | * in the transaction. | |
772 | */ | |
773 | if (iuid != uid) { | |
774 | if (XFS_IS_UQUOTA_ON(mp)) { | |
775 | ASSERT(mask & XFS_AT_UID); | |
776 | ASSERT(udqp); | |
777 | olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip, | |
778 | &ip->i_udquot, udqp); | |
779 | } | |
780 | ip->i_d.di_uid = uid; | |
781 | } | |
782 | if (igid != gid) { | |
783 | if (XFS_IS_GQUOTA_ON(mp)) { | |
784 | ASSERT(!XFS_IS_PQUOTA_ON(mp)); | |
785 | ASSERT(mask & XFS_AT_GID); | |
786 | ASSERT(gdqp); | |
787 | olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip, | |
788 | &ip->i_gdquot, gdqp); | |
789 | } | |
790 | ip->i_d.di_gid = gid; | |
791 | } | |
792 | if (iprojid != projid) { | |
793 | if (XFS_IS_PQUOTA_ON(mp)) { | |
794 | ASSERT(!XFS_IS_GQUOTA_ON(mp)); | |
795 | ASSERT(mask & XFS_AT_PROJID); | |
796 | ASSERT(gdqp); | |
797 | olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip, | |
798 | &ip->i_gdquot, gdqp); | |
799 | } | |
800 | ip->i_d.di_projid = projid; | |
801 | /* | |
802 | * We may have to rev the inode as well as | |
803 | * the superblock version number since projids didn't | |
804 | * exist before DINODE_VERSION_2 and SB_VERSION_NLINK. | |
805 | */ | |
806 | if (ip->i_d.di_version == XFS_DINODE_VERSION_1) | |
807 | xfs_bump_ino_vers2(tp, ip); | |
808 | } | |
809 | ||
810 | xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); | |
811 | timeflags |= XFS_ICHGTIME_CHG; | |
812 | } | |
813 | ||
814 | ||
815 | /* | |
816 | * Change file access or modified times. | |
817 | */ | |
818 | if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) { | |
819 | if (mask & XFS_AT_ATIME) { | |
820 | ip->i_d.di_atime.t_sec = vap->va_atime.tv_sec; | |
821 | ip->i_d.di_atime.t_nsec = vap->va_atime.tv_nsec; | |
822 | ip->i_update_core = 1; | |
823 | timeflags &= ~XFS_ICHGTIME_ACC; | |
824 | } | |
825 | if (mask & XFS_AT_MTIME) { | |
826 | ip->i_d.di_mtime.t_sec = vap->va_mtime.tv_sec; | |
827 | ip->i_d.di_mtime.t_nsec = vap->va_mtime.tv_nsec; | |
828 | timeflags &= ~XFS_ICHGTIME_MOD; | |
829 | timeflags |= XFS_ICHGTIME_CHG; | |
830 | } | |
831 | if (tp && (flags & ATTR_UTIME)) | |
832 | xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); | |
833 | } | |
834 | ||
835 | /* | |
836 | * Change XFS-added attributes. | |
837 | */ | |
838 | if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) { | |
839 | if (mask & XFS_AT_EXTSIZE) { | |
840 | /* | |
841 | * Converting bytes to fs blocks. | |
842 | */ | |
843 | ip->i_d.di_extsize = vap->va_extsize >> | |
844 | mp->m_sb.sb_blocklog; | |
845 | } | |
846 | if (mask & XFS_AT_XFLAGS) { | |
847 | uint di_flags; | |
848 | ||
849 | /* can't set PREALLOC this way, just preserve it */ | |
850 | di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC); | |
851 | if (vap->va_xflags & XFS_XFLAG_IMMUTABLE) | |
852 | di_flags |= XFS_DIFLAG_IMMUTABLE; | |
853 | if (vap->va_xflags & XFS_XFLAG_APPEND) | |
854 | di_flags |= XFS_DIFLAG_APPEND; | |
855 | if (vap->va_xflags & XFS_XFLAG_SYNC) | |
856 | di_flags |= XFS_DIFLAG_SYNC; | |
857 | if (vap->va_xflags & XFS_XFLAG_NOATIME) | |
858 | di_flags |= XFS_DIFLAG_NOATIME; | |
859 | if (vap->va_xflags & XFS_XFLAG_NODUMP) | |
860 | di_flags |= XFS_DIFLAG_NODUMP; | |
861 | if (vap->va_xflags & XFS_XFLAG_PROJINHERIT) | |
862 | di_flags |= XFS_DIFLAG_PROJINHERIT; | |
863 | if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) { | |
864 | if (vap->va_xflags & XFS_XFLAG_RTINHERIT) | |
865 | di_flags |= XFS_DIFLAG_RTINHERIT; | |
866 | if (vap->va_xflags & XFS_XFLAG_NOSYMLINKS) | |
867 | di_flags |= XFS_DIFLAG_NOSYMLINKS; | |
868 | } else { | |
869 | if (vap->va_xflags & XFS_XFLAG_REALTIME) { | |
870 | di_flags |= XFS_DIFLAG_REALTIME; | |
871 | ip->i_iocore.io_flags |= XFS_IOCORE_RT; | |
872 | } else { | |
873 | ip->i_iocore.io_flags &= ~XFS_IOCORE_RT; | |
874 | } | |
875 | } | |
876 | ip->i_d.di_flags = di_flags; | |
877 | } | |
878 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
879 | timeflags |= XFS_ICHGTIME_CHG; | |
880 | } | |
881 | ||
882 | /* | |
883 | * Change file inode change time only if XFS_AT_CTIME set | |
884 | * AND we have been called by a DMI function. | |
885 | */ | |
886 | ||
887 | if ( (flags & ATTR_DMI) && (mask & XFS_AT_CTIME) ) { | |
888 | ip->i_d.di_ctime.t_sec = vap->va_ctime.tv_sec; | |
889 | ip->i_d.di_ctime.t_nsec = vap->va_ctime.tv_nsec; | |
890 | ip->i_update_core = 1; | |
891 | timeflags &= ~XFS_ICHGTIME_CHG; | |
892 | } | |
893 | ||
894 | /* | |
895 | * Send out timestamp changes that need to be set to the | |
896 | * current time. Not done when called by a DMI function. | |
897 | */ | |
898 | if (timeflags && !(flags & ATTR_DMI)) | |
899 | xfs_ichgtime(ip, timeflags); | |
900 | ||
901 | XFS_STATS_INC(xs_ig_attrchg); | |
902 | ||
903 | /* | |
904 | * If this is a synchronous mount, make sure that the | |
905 | * transaction goes to disk before returning to the user. | |
906 | * This is slightly sub-optimal in that truncates require | |
907 | * two sync transactions instead of one for wsync filesytems. | |
908 | * One for the truncate and one for the timestamps since we | |
909 | * don't want to change the timestamps unless we're sure the | |
910 | * truncate worked. Truncates are less than 1% of the laddis | |
911 | * mix so this probably isn't worth the trouble to optimize. | |
912 | */ | |
913 | code = 0; | |
914 | if (tp) { | |
915 | if (mp->m_flags & XFS_MOUNT_WSYNC) | |
916 | xfs_trans_set_sync(tp); | |
917 | ||
918 | code = xfs_trans_commit(tp, commit_flags, NULL); | |
919 | } | |
920 | ||
921 | /* | |
922 | * If the (regular) file's mandatory locking mode changed, then | |
923 | * notify the vnode. We do this under the inode lock to prevent | |
924 | * racing calls to vop_vnode_change. | |
925 | */ | |
926 | mandlock_after = MANDLOCK(vp, ip->i_d.di_mode); | |
927 | if (mandlock_before != mandlock_after) { | |
928 | VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_ENF_LOCKING, | |
929 | mandlock_after); | |
930 | } | |
931 | ||
932 | xfs_iunlock(ip, lock_flags); | |
933 | ||
934 | /* | |
935 | * Release any dquot(s) the inode had kept before chown. | |
936 | */ | |
937 | XFS_QM_DQRELE(mp, olddquot1); | |
938 | XFS_QM_DQRELE(mp, olddquot2); | |
939 | XFS_QM_DQRELE(mp, udqp); | |
940 | XFS_QM_DQRELE(mp, gdqp); | |
941 | ||
942 | if (code) { | |
943 | return code; | |
944 | } | |
945 | ||
946 | if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_ATTRIBUTE) && | |
947 | !(flags & ATTR_DMI)) { | |
948 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, vp, DM_RIGHT_NULL, | |
949 | NULL, DM_RIGHT_NULL, NULL, NULL, | |
950 | 0, 0, AT_DELAY_FLAG(flags)); | |
951 | } | |
952 | return 0; | |
953 | ||
954 | abort_return: | |
955 | commit_flags |= XFS_TRANS_ABORT; | |
956 | /* FALLTHROUGH */ | |
957 | error_return: | |
958 | XFS_QM_DQRELE(mp, udqp); | |
959 | XFS_QM_DQRELE(mp, gdqp); | |
960 | if (tp) { | |
961 | xfs_trans_cancel(tp, commit_flags); | |
962 | } | |
963 | if (lock_flags != 0) { | |
964 | xfs_iunlock(ip, lock_flags); | |
965 | } | |
966 | return code; | |
967 | } | |
968 | ||
969 | ||
970 | /* | |
971 | * xfs_access | |
972 | * Null conversion from vnode mode bits to inode mode bits, as in efs. | |
973 | */ | |
974 | STATIC int | |
975 | xfs_access( | |
976 | bhv_desc_t *bdp, | |
977 | int mode, | |
978 | cred_t *credp) | |
979 | { | |
980 | xfs_inode_t *ip; | |
981 | int error; | |
982 | ||
983 | vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, | |
984 | (inst_t *)__return_address); | |
985 | ||
986 | ip = XFS_BHVTOI(bdp); | |
987 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
988 | error = xfs_iaccess(ip, mode, credp); | |
989 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
990 | return error; | |
991 | } | |
992 | ||
993 | ||
994 | /* | |
995 | * xfs_readlink | |
996 | * | |
997 | */ | |
998 | STATIC int | |
999 | xfs_readlink( | |
1000 | bhv_desc_t *bdp, | |
1001 | uio_t *uiop, | |
1002 | int ioflags, | |
1003 | cred_t *credp) | |
1004 | { | |
1005 | xfs_inode_t *ip; | |
1006 | int count; | |
1007 | xfs_off_t offset; | |
1008 | int pathlen; | |
1009 | vnode_t *vp; | |
1010 | int error = 0; | |
1011 | xfs_mount_t *mp; | |
1012 | int nmaps; | |
1013 | xfs_bmbt_irec_t mval[SYMLINK_MAPS]; | |
1014 | xfs_daddr_t d; | |
1015 | int byte_cnt; | |
1016 | int n; | |
1017 | xfs_buf_t *bp; | |
1018 | ||
1019 | vp = BHV_TO_VNODE(bdp); | |
1020 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
1021 | ||
1022 | ip = XFS_BHVTOI(bdp); | |
1023 | mp = ip->i_mount; | |
1024 | ||
1025 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1026 | return XFS_ERROR(EIO); | |
1027 | ||
1028 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
1029 | ||
1030 | ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK); | |
1031 | ||
1032 | offset = uiop->uio_offset; | |
1033 | count = uiop->uio_resid; | |
1034 | ||
1035 | if (offset < 0) { | |
1036 | error = XFS_ERROR(EINVAL); | |
1037 | goto error_return; | |
1038 | } | |
1039 | if (count <= 0) { | |
1040 | error = 0; | |
1041 | goto error_return; | |
1042 | } | |
1043 | ||
1044 | if (!(ioflags & IO_INVIS)) { | |
1045 | xfs_ichgtime(ip, XFS_ICHGTIME_ACC); | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * See if the symlink is stored inline. | |
1050 | */ | |
1051 | pathlen = (int)ip->i_d.di_size; | |
1052 | ||
1053 | if (ip->i_df.if_flags & XFS_IFINLINE) { | |
1054 | error = uio_read(ip->i_df.if_u1.if_data, pathlen, uiop); | |
1055 | } | |
1056 | else { | |
1057 | /* | |
1058 | * Symlink not inline. Call bmap to get it in. | |
1059 | */ | |
1060 | nmaps = SYMLINK_MAPS; | |
1061 | ||
1062 | error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), | |
1063 | 0, NULL, 0, mval, &nmaps, NULL); | |
1064 | ||
1065 | if (error) { | |
1066 | goto error_return; | |
1067 | } | |
1068 | ||
1069 | for (n = 0; n < nmaps; n++) { | |
1070 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
1071 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
1072 | bp = xfs_buf_read(mp->m_ddev_targp, d, | |
1073 | BTOBB(byte_cnt), 0); | |
1074 | error = XFS_BUF_GETERROR(bp); | |
1075 | if (error) { | |
1076 | xfs_ioerror_alert("xfs_readlink", | |
1077 | ip->i_mount, bp, XFS_BUF_ADDR(bp)); | |
1078 | xfs_buf_relse(bp); | |
1079 | goto error_return; | |
1080 | } | |
1081 | if (pathlen < byte_cnt) | |
1082 | byte_cnt = pathlen; | |
1083 | pathlen -= byte_cnt; | |
1084 | ||
1085 | error = uio_read(XFS_BUF_PTR(bp), byte_cnt, uiop); | |
1086 | xfs_buf_relse (bp); | |
1087 | } | |
1088 | ||
1089 | } | |
1090 | ||
1091 | ||
1092 | error_return: | |
1093 | ||
1094 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1095 | ||
1096 | return error; | |
1097 | } | |
1098 | ||
1099 | ||
1100 | /* | |
1101 | * xfs_fsync | |
1102 | * | |
1103 | * This is called to sync the inode and its data out to disk. | |
1104 | * We need to hold the I/O lock while flushing the data, and | |
1105 | * the inode lock while flushing the inode. The inode lock CANNOT | |
1106 | * be held while flushing the data, so acquire after we're done | |
1107 | * with that. | |
1108 | */ | |
1109 | STATIC int | |
1110 | xfs_fsync( | |
1111 | bhv_desc_t *bdp, | |
1112 | int flag, | |
1113 | cred_t *credp, | |
1114 | xfs_off_t start, | |
1115 | xfs_off_t stop) | |
1116 | { | |
1117 | xfs_inode_t *ip; | |
1118 | xfs_trans_t *tp; | |
1119 | int error; | |
1120 | ||
1121 | vn_trace_entry(BHV_TO_VNODE(bdp), | |
1122 | __FUNCTION__, (inst_t *)__return_address); | |
1123 | ||
1124 | ip = XFS_BHVTOI(bdp); | |
1125 | ||
1126 | ASSERT(start >= 0 && stop >= -1); | |
1127 | ||
1128 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) | |
1129 | return XFS_ERROR(EIO); | |
1130 | ||
1131 | /* | |
1132 | * We always need to make sure that the required inode state | |
1133 | * is safe on disk. The vnode might be clean but because | |
1134 | * of committed transactions that haven't hit the disk yet. | |
1135 | * Likewise, there could be unflushed non-transactional | |
1136 | * changes to the inode core that have to go to disk. | |
1137 | * | |
1138 | * The following code depends on one assumption: that | |
1139 | * any transaction that changes an inode logs the core | |
1140 | * because it has to change some field in the inode core | |
1141 | * (typically nextents or nblocks). That assumption | |
1142 | * implies that any transactions against an inode will | |
1143 | * catch any non-transactional updates. If inode-altering | |
1144 | * transactions exist that violate this assumption, the | |
1145 | * code breaks. Right now, it figures that if the involved | |
1146 | * update_* field is clear and the inode is unpinned, the | |
1147 | * inode is clean. Either it's been flushed or it's been | |
1148 | * committed and the commit has hit the disk unpinning the inode. | |
1149 | * (Note that xfs_inode_item_format() called at commit clears | |
1150 | * the update_* fields.) | |
1151 | */ | |
1152 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
1153 | ||
1154 | /* If we are flushing data then we care about update_size | |
1155 | * being set, otherwise we care about update_core | |
1156 | */ | |
1157 | if ((flag & FSYNC_DATA) ? | |
1158 | (ip->i_update_size == 0) : | |
1159 | (ip->i_update_core == 0)) { | |
1160 | /* | |
1161 | * Timestamps/size haven't changed since last inode | |
1162 | * flush or inode transaction commit. That means | |
1163 | * either nothing got written or a transaction | |
1164 | * committed which caught the updates. If the | |
1165 | * latter happened and the transaction hasn't | |
1166 | * hit the disk yet, the inode will be still | |
1167 | * be pinned. If it is, force the log. | |
1168 | */ | |
1169 | ||
1170 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1171 | ||
1172 | if (xfs_ipincount(ip)) { | |
1173 | xfs_log_force(ip->i_mount, (xfs_lsn_t)0, | |
1174 | XFS_LOG_FORCE | | |
1175 | ((flag & FSYNC_WAIT) | |
1176 | ? XFS_LOG_SYNC : 0)); | |
1177 | } | |
1178 | error = 0; | |
1179 | } else { | |
1180 | /* | |
1181 | * Kick off a transaction to log the inode | |
1182 | * core to get the updates. Make it | |
1183 | * sync if FSYNC_WAIT is passed in (which | |
1184 | * is done by everybody but specfs). The | |
1185 | * sync transaction will also force the log. | |
1186 | */ | |
1187 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1188 | tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS); | |
1189 | if ((error = xfs_trans_reserve(tp, 0, | |
1190 | XFS_FSYNC_TS_LOG_RES(ip->i_mount), | |
1191 | 0, 0, 0))) { | |
1192 | xfs_trans_cancel(tp, 0); | |
1193 | return error; | |
1194 | } | |
1195 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1196 | ||
1197 | /* | |
1198 | * Note - it's possible that we might have pushed | |
1199 | * ourselves out of the way during trans_reserve | |
1200 | * which would flush the inode. But there's no | |
1201 | * guarantee that the inode buffer has actually | |
1202 | * gone out yet (it's delwri). Plus the buffer | |
1203 | * could be pinned anyway if it's part of an | |
1204 | * inode in another recent transaction. So we | |
1205 | * play it safe and fire off the transaction anyway. | |
1206 | */ | |
1207 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
1208 | xfs_trans_ihold(tp, ip); | |
1209 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1210 | if (flag & FSYNC_WAIT) | |
1211 | xfs_trans_set_sync(tp); | |
1212 | error = xfs_trans_commit(tp, 0, NULL); | |
1213 | ||
1214 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1215 | } | |
1216 | return error; | |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | * This is called by xfs_inactive to free any blocks beyond eof, | |
1221 | * when the link count isn't zero. | |
1222 | */ | |
1223 | STATIC int | |
1224 | xfs_inactive_free_eofblocks( | |
1225 | xfs_mount_t *mp, | |
1226 | xfs_inode_t *ip) | |
1227 | { | |
1228 | xfs_trans_t *tp; | |
1229 | int error; | |
1230 | xfs_fileoff_t end_fsb; | |
1231 | xfs_fileoff_t last_fsb; | |
1232 | xfs_filblks_t map_len; | |
1233 | int nimaps; | |
1234 | xfs_bmbt_irec_t imap; | |
1235 | ||
1236 | /* | |
1237 | * Figure out if there are any blocks beyond the end | |
1238 | * of the file. If not, then there is nothing to do. | |
1239 | */ | |
1240 | end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_d.di_size)); | |
1241 | last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); | |
1242 | map_len = last_fsb - end_fsb; | |
1243 | if (map_len <= 0) | |
1244 | return (0); | |
1245 | ||
1246 | nimaps = 1; | |
1247 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
1248 | error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0, | |
1249 | NULL, 0, &imap, &nimaps, NULL); | |
1250 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
1251 | ||
1252 | if (!error && (nimaps != 0) && | |
1253 | (imap.br_startblock != HOLESTARTBLOCK)) { | |
1254 | /* | |
1255 | * Attach the dquots to the inode up front. | |
1256 | */ | |
1257 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
1258 | return (error); | |
1259 | ||
1260 | /* | |
1261 | * There are blocks after the end of file. | |
1262 | * Free them up now by truncating the file to | |
1263 | * its current size. | |
1264 | */ | |
1265 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1266 | ||
1267 | /* | |
1268 | * Do the xfs_itruncate_start() call before | |
1269 | * reserving any log space because | |
1270 | * itruncate_start will call into the buffer | |
1271 | * cache and we can't | |
1272 | * do that within a transaction. | |
1273 | */ | |
1274 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1275 | xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, | |
1276 | ip->i_d.di_size); | |
1277 | ||
1278 | error = xfs_trans_reserve(tp, 0, | |
1279 | XFS_ITRUNCATE_LOG_RES(mp), | |
1280 | 0, XFS_TRANS_PERM_LOG_RES, | |
1281 | XFS_ITRUNCATE_LOG_COUNT); | |
1282 | if (error) { | |
1283 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1284 | xfs_trans_cancel(tp, 0); | |
1285 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1286 | return (error); | |
1287 | } | |
1288 | ||
1289 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1290 | xfs_trans_ijoin(tp, ip, | |
1291 | XFS_IOLOCK_EXCL | | |
1292 | XFS_ILOCK_EXCL); | |
1293 | xfs_trans_ihold(tp, ip); | |
1294 | ||
1295 | error = xfs_itruncate_finish(&tp, ip, | |
1296 | ip->i_d.di_size, | |
1297 | XFS_DATA_FORK, | |
1298 | 0); | |
1299 | /* | |
1300 | * If we get an error at this point we | |
1301 | * simply don't bother truncating the file. | |
1302 | */ | |
1303 | if (error) { | |
1304 | xfs_trans_cancel(tp, | |
1305 | (XFS_TRANS_RELEASE_LOG_RES | | |
1306 | XFS_TRANS_ABORT)); | |
1307 | } else { | |
1308 | error = xfs_trans_commit(tp, | |
1309 | XFS_TRANS_RELEASE_LOG_RES, | |
1310 | NULL); | |
1311 | } | |
1312 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1313 | } | |
1314 | return (error); | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Free a symlink that has blocks associated with it. | |
1319 | */ | |
1320 | STATIC int | |
1321 | xfs_inactive_symlink_rmt( | |
1322 | xfs_inode_t *ip, | |
1323 | xfs_trans_t **tpp) | |
1324 | { | |
1325 | xfs_buf_t *bp; | |
1326 | int committed; | |
1327 | int done; | |
1328 | int error; | |
1329 | xfs_fsblock_t first_block; | |
1330 | xfs_bmap_free_t free_list; | |
1331 | int i; | |
1332 | xfs_mount_t *mp; | |
1333 | xfs_bmbt_irec_t mval[SYMLINK_MAPS]; | |
1334 | int nmaps; | |
1335 | xfs_trans_t *ntp; | |
1336 | int size; | |
1337 | xfs_trans_t *tp; | |
1338 | ||
1339 | tp = *tpp; | |
1340 | mp = ip->i_mount; | |
1341 | ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip)); | |
1342 | /* | |
1343 | * We're freeing a symlink that has some | |
1344 | * blocks allocated to it. Free the | |
1345 | * blocks here. We know that we've got | |
1346 | * either 1 or 2 extents and that we can | |
1347 | * free them all in one bunmapi call. | |
1348 | */ | |
1349 | ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); | |
1350 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
1351 | XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { | |
1352 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1353 | xfs_trans_cancel(tp, 0); | |
1354 | *tpp = NULL; | |
1355 | return error; | |
1356 | } | |
1357 | /* | |
1358 | * Lock the inode, fix the size, and join it to the transaction. | |
1359 | * Hold it so in the normal path, we still have it locked for | |
1360 | * the second transaction. In the error paths we need it | |
1361 | * held so the cancel won't rele it, see below. | |
1362 | */ | |
1363 | xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1364 | size = (int)ip->i_d.di_size; | |
1365 | ip->i_d.di_size = 0; | |
1366 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1367 | xfs_trans_ihold(tp, ip); | |
1368 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1369 | /* | |
1370 | * Find the block(s) so we can inval and unmap them. | |
1371 | */ | |
1372 | done = 0; | |
1373 | XFS_BMAP_INIT(&free_list, &first_block); | |
1374 | nmaps = sizeof(mval) / sizeof(mval[0]); | |
1375 | if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size), | |
1376 | XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps, | |
1377 | &free_list))) | |
1378 | goto error0; | |
1379 | /* | |
1380 | * Invalidate the block(s). | |
1381 | */ | |
1382 | for (i = 0; i < nmaps; i++) { | |
1383 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, | |
1384 | XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), | |
1385 | XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); | |
1386 | xfs_trans_binval(tp, bp); | |
1387 | } | |
1388 | /* | |
1389 | * Unmap the dead block(s) to the free_list. | |
1390 | */ | |
1391 | if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, | |
1392 | &first_block, &free_list, &done))) | |
1393 | goto error1; | |
1394 | ASSERT(done); | |
1395 | /* | |
1396 | * Commit the first transaction. This logs the EFI and the inode. | |
1397 | */ | |
1398 | if ((error = xfs_bmap_finish(&tp, &free_list, first_block, &committed))) | |
1399 | goto error1; | |
1400 | /* | |
1401 | * The transaction must have been committed, since there were | |
1402 | * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. | |
1403 | * The new tp has the extent freeing and EFDs. | |
1404 | */ | |
1405 | ASSERT(committed); | |
1406 | /* | |
1407 | * The first xact was committed, so add the inode to the new one. | |
1408 | * Mark it dirty so it will be logged and moved forward in the log as | |
1409 | * part of every commit. | |
1410 | */ | |
1411 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1412 | xfs_trans_ihold(tp, ip); | |
1413 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
1414 | /* | |
1415 | * Get a new, empty transaction to return to our caller. | |
1416 | */ | |
1417 | ntp = xfs_trans_dup(tp); | |
1418 | /* | |
1419 | * Commit the transaction containing extent freeing and EFD's. | |
1420 | * If we get an error on the commit here or on the reserve below, | |
1421 | * we need to unlock the inode since the new transaction doesn't | |
1422 | * have the inode attached. | |
1423 | */ | |
1424 | error = xfs_trans_commit(tp, 0, NULL); | |
1425 | tp = ntp; | |
1426 | if (error) { | |
1427 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1428 | goto error0; | |
1429 | } | |
1430 | /* | |
1431 | * Remove the memory for extent descriptions (just bookkeeping). | |
1432 | */ | |
1433 | if (ip->i_df.if_bytes) | |
1434 | xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); | |
1435 | ASSERT(ip->i_df.if_bytes == 0); | |
1436 | /* | |
1437 | * Put an itruncate log reservation in the new transaction | |
1438 | * for our caller. | |
1439 | */ | |
1440 | if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, | |
1441 | XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { | |
1442 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1443 | goto error0; | |
1444 | } | |
1445 | /* | |
1446 | * Return with the inode locked but not joined to the transaction. | |
1447 | */ | |
1448 | *tpp = tp; | |
1449 | return 0; | |
1450 | ||
1451 | error1: | |
1452 | xfs_bmap_cancel(&free_list); | |
1453 | error0: | |
1454 | /* | |
1455 | * Have to come here with the inode locked and either | |
1456 | * (held and in the transaction) or (not in the transaction). | |
1457 | * If the inode isn't held then cancel would iput it, but | |
1458 | * that's wrong since this is inactive and the vnode ref | |
1459 | * count is 0 already. | |
1460 | * Cancel won't do anything to the inode if held, but it still | |
1461 | * needs to be locked until the cancel is done, if it was | |
1462 | * joined to the transaction. | |
1463 | */ | |
1464 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1465 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1466 | *tpp = NULL; | |
1467 | return error; | |
1468 | ||
1469 | } | |
1470 | ||
1471 | STATIC int | |
1472 | xfs_inactive_symlink_local( | |
1473 | xfs_inode_t *ip, | |
1474 | xfs_trans_t **tpp) | |
1475 | { | |
1476 | int error; | |
1477 | ||
1478 | ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip)); | |
1479 | /* | |
1480 | * We're freeing a symlink which fit into | |
1481 | * the inode. Just free the memory used | |
1482 | * to hold the old symlink. | |
1483 | */ | |
1484 | error = xfs_trans_reserve(*tpp, 0, | |
1485 | XFS_ITRUNCATE_LOG_RES(ip->i_mount), | |
1486 | 0, XFS_TRANS_PERM_LOG_RES, | |
1487 | XFS_ITRUNCATE_LOG_COUNT); | |
1488 | ||
1489 | if (error) { | |
1490 | xfs_trans_cancel(*tpp, 0); | |
1491 | *tpp = NULL; | |
1492 | return (error); | |
1493 | } | |
1494 | xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1495 | ||
1496 | /* | |
1497 | * Zero length symlinks _can_ exist. | |
1498 | */ | |
1499 | if (ip->i_df.if_bytes > 0) { | |
1500 | xfs_idata_realloc(ip, | |
1501 | -(ip->i_df.if_bytes), | |
1502 | XFS_DATA_FORK); | |
1503 | ASSERT(ip->i_df.if_bytes == 0); | |
1504 | } | |
1505 | return (0); | |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * | |
1510 | */ | |
1511 | STATIC int | |
1512 | xfs_inactive_attrs( | |
1513 | xfs_inode_t *ip, | |
1514 | xfs_trans_t **tpp) | |
1515 | { | |
1516 | xfs_trans_t *tp; | |
1517 | int error; | |
1518 | xfs_mount_t *mp; | |
1519 | ||
1520 | ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE)); | |
1521 | tp = *tpp; | |
1522 | mp = ip->i_mount; | |
1523 | ASSERT(ip->i_d.di_forkoff != 0); | |
1524 | xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
1525 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
1526 | ||
1527 | error = xfs_attr_inactive(ip); | |
1528 | if (error) { | |
1529 | *tpp = NULL; | |
1530 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1531 | return (error); /* goto out*/ | |
1532 | } | |
1533 | ||
1534 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1535 | error = xfs_trans_reserve(tp, 0, | |
1536 | XFS_IFREE_LOG_RES(mp), | |
1537 | 0, XFS_TRANS_PERM_LOG_RES, | |
1538 | XFS_INACTIVE_LOG_COUNT); | |
1539 | if (error) { | |
1540 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1541 | xfs_trans_cancel(tp, 0); | |
1542 | *tpp = NULL; | |
1543 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1544 | return (error); | |
1545 | } | |
1546 | ||
1547 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1548 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1549 | xfs_trans_ihold(tp, ip); | |
1550 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
1551 | ||
1552 | ASSERT(ip->i_d.di_anextents == 0); | |
1553 | ||
1554 | *tpp = tp; | |
1555 | return (0); | |
1556 | } | |
1557 | ||
1558 | STATIC int | |
1559 | xfs_release( | |
1560 | bhv_desc_t *bdp) | |
1561 | { | |
1562 | xfs_inode_t *ip; | |
1563 | vnode_t *vp; | |
1564 | xfs_mount_t *mp; | |
1565 | int error; | |
1566 | ||
1567 | vp = BHV_TO_VNODE(bdp); | |
1568 | ip = XFS_BHVTOI(bdp); | |
1569 | ||
1570 | if ((vp->v_type != VREG) || (ip->i_d.di_mode == 0)) { | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | /* If this is a read-only mount, don't do this (would generate I/O) */ | |
1575 | if (vp->v_vfsp->vfs_flag & VFS_RDONLY) | |
1576 | return 0; | |
1577 | ||
1578 | #ifdef HAVE_REFCACHE | |
1579 | /* If we are in the NFS reference cache then don't do this now */ | |
1580 | if (ip->i_refcache) | |
1581 | return 0; | |
1582 | #endif | |
1583 | ||
1584 | mp = ip->i_mount; | |
1585 | ||
1586 | if (ip->i_d.di_nlink != 0) { | |
1587 | if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && | |
1588 | ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) && | |
1589 | (ip->i_df.if_flags & XFS_IFEXTENTS)) && | |
1590 | (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)))) { | |
1591 | if ((error = xfs_inactive_free_eofblocks(mp, ip))) | |
1592 | return (error); | |
1593 | /* Update linux inode block count after free above */ | |
1594 | LINVFS_GET_IP(vp)->i_blocks = XFS_FSB_TO_BB(mp, | |
1595 | ip->i_d.di_nblocks + ip->i_delayed_blks); | |
1596 | } | |
1597 | } | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * xfs_inactive | |
1604 | * | |
1605 | * This is called when the vnode reference count for the vnode | |
1606 | * goes to zero. If the file has been unlinked, then it must | |
1607 | * now be truncated. Also, we clear all of the read-ahead state | |
1608 | * kept for the inode here since the file is now closed. | |
1609 | */ | |
1610 | STATIC int | |
1611 | xfs_inactive( | |
1612 | bhv_desc_t *bdp, | |
1613 | cred_t *credp) | |
1614 | { | |
1615 | xfs_inode_t *ip; | |
1616 | vnode_t *vp; | |
1617 | xfs_bmap_free_t free_list; | |
1618 | xfs_fsblock_t first_block; | |
1619 | int committed; | |
1620 | xfs_trans_t *tp; | |
1621 | xfs_mount_t *mp; | |
1622 | int error; | |
1623 | int truncate; | |
1624 | ||
1625 | vp = BHV_TO_VNODE(bdp); | |
1626 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
1627 | ||
1628 | ip = XFS_BHVTOI(bdp); | |
1629 | ||
1630 | /* | |
1631 | * If the inode is already free, then there can be nothing | |
1632 | * to clean up here. | |
1633 | */ | |
1634 | if (ip->i_d.di_mode == 0 || VN_BAD(vp)) { | |
1635 | ASSERT(ip->i_df.if_real_bytes == 0); | |
1636 | ASSERT(ip->i_df.if_broot_bytes == 0); | |
1637 | return VN_INACTIVE_CACHE; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * Only do a truncate if it's a regular file with | |
1642 | * some actual space in it. It's OK to look at the | |
1643 | * inode's fields without the lock because we're the | |
1644 | * only one with a reference to the inode. | |
1645 | */ | |
1646 | truncate = ((ip->i_d.di_nlink == 0) && | |
1647 | ((ip->i_d.di_size != 0) || (ip->i_d.di_nextents > 0)) && | |
1648 | ((ip->i_d.di_mode & S_IFMT) == S_IFREG)); | |
1649 | ||
1650 | mp = ip->i_mount; | |
1651 | ||
1652 | if (ip->i_d.di_nlink == 0 && | |
1653 | DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_DESTROY)) { | |
1654 | (void) XFS_SEND_DESTROY(mp, vp, DM_RIGHT_NULL); | |
1655 | } | |
1656 | ||
1657 | error = 0; | |
1658 | ||
1659 | /* If this is a read-only mount, don't do this (would generate I/O) */ | |
1660 | if (vp->v_vfsp->vfs_flag & VFS_RDONLY) | |
1661 | goto out; | |
1662 | ||
1663 | if (ip->i_d.di_nlink != 0) { | |
1664 | if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && | |
1665 | ((ip->i_d.di_size > 0) || (VN_CACHED(vp) > 0)) && | |
1666 | (ip->i_df.if_flags & XFS_IFEXTENTS)) && | |
1667 | (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)) || | |
1668 | (ip->i_delayed_blks != 0))) { | |
1669 | if ((error = xfs_inactive_free_eofblocks(mp, ip))) | |
1670 | return (VN_INACTIVE_CACHE); | |
1671 | /* Update linux inode block count after free above */ | |
1672 | LINVFS_GET_IP(vp)->i_blocks = XFS_FSB_TO_BB(mp, | |
1673 | ip->i_d.di_nblocks + ip->i_delayed_blks); | |
1674 | } | |
1675 | goto out; | |
1676 | } | |
1677 | ||
1678 | ASSERT(ip->i_d.di_nlink == 0); | |
1679 | ||
1680 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
1681 | return (VN_INACTIVE_CACHE); | |
1682 | ||
1683 | tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); | |
1684 | if (truncate) { | |
1685 | /* | |
1686 | * Do the xfs_itruncate_start() call before | |
1687 | * reserving any log space because itruncate_start | |
1688 | * will call into the buffer cache and we can't | |
1689 | * do that within a transaction. | |
1690 | */ | |
1691 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
1692 | ||
1693 | xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0); | |
1694 | ||
1695 | error = xfs_trans_reserve(tp, 0, | |
1696 | XFS_ITRUNCATE_LOG_RES(mp), | |
1697 | 0, XFS_TRANS_PERM_LOG_RES, | |
1698 | XFS_ITRUNCATE_LOG_COUNT); | |
1699 | if (error) { | |
1700 | /* Don't call itruncate_cleanup */ | |
1701 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1702 | xfs_trans_cancel(tp, 0); | |
1703 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
1704 | return (VN_INACTIVE_CACHE); | |
1705 | } | |
1706 | ||
1707 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
1708 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1709 | xfs_trans_ihold(tp, ip); | |
1710 | ||
1711 | /* | |
1712 | * normally, we have to run xfs_itruncate_finish sync. | |
1713 | * But if filesystem is wsync and we're in the inactive | |
1714 | * path, then we know that nlink == 0, and that the | |
1715 | * xaction that made nlink == 0 is permanently committed | |
1716 | * since xfs_remove runs as a synchronous transaction. | |
1717 | */ | |
1718 | error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK, | |
1719 | (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0)); | |
1720 | ||
1721 | if (error) { | |
1722 | xfs_trans_cancel(tp, | |
1723 | XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
1724 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1725 | return (VN_INACTIVE_CACHE); | |
1726 | } | |
1727 | } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) { | |
1728 | ||
1729 | /* | |
1730 | * If we get an error while cleaning up a | |
1731 | * symlink we bail out. | |
1732 | */ | |
1733 | error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ? | |
1734 | xfs_inactive_symlink_rmt(ip, &tp) : | |
1735 | xfs_inactive_symlink_local(ip, &tp); | |
1736 | ||
1737 | if (error) { | |
1738 | ASSERT(tp == NULL); | |
1739 | return (VN_INACTIVE_CACHE); | |
1740 | } | |
1741 | ||
1742 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1743 | xfs_trans_ihold(tp, ip); | |
1744 | } else { | |
1745 | error = xfs_trans_reserve(tp, 0, | |
1746 | XFS_IFREE_LOG_RES(mp), | |
1747 | 0, XFS_TRANS_PERM_LOG_RES, | |
1748 | XFS_INACTIVE_LOG_COUNT); | |
1749 | if (error) { | |
1750 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
1751 | xfs_trans_cancel(tp, 0); | |
1752 | return (VN_INACTIVE_CACHE); | |
1753 | } | |
1754 | ||
1755 | xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
1756 | xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1757 | xfs_trans_ihold(tp, ip); | |
1758 | } | |
1759 | ||
1760 | /* | |
1761 | * If there are attributes associated with the file | |
1762 | * then blow them away now. The code calls a routine | |
1763 | * that recursively deconstructs the attribute fork. | |
1764 | * We need to just commit the current transaction | |
1765 | * because we can't use it for xfs_attr_inactive(). | |
1766 | */ | |
1767 | if (ip->i_d.di_anextents > 0) { | |
1768 | error = xfs_inactive_attrs(ip, &tp); | |
1769 | /* | |
1770 | * If we got an error, the transaction is already | |
1771 | * cancelled, and the inode is unlocked. Just get out. | |
1772 | */ | |
1773 | if (error) | |
1774 | return (VN_INACTIVE_CACHE); | |
1775 | } else if (ip->i_afp) { | |
1776 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
1777 | } | |
1778 | ||
1779 | /* | |
1780 | * Free the inode. | |
1781 | */ | |
1782 | XFS_BMAP_INIT(&free_list, &first_block); | |
1783 | error = xfs_ifree(tp, ip, &free_list); | |
1784 | if (error) { | |
1785 | /* | |
1786 | * If we fail to free the inode, shut down. The cancel | |
1787 | * might do that, we need to make sure. Otherwise the | |
1788 | * inode might be lost for a long time or forever. | |
1789 | */ | |
1790 | if (!XFS_FORCED_SHUTDOWN(mp)) { | |
1791 | cmn_err(CE_NOTE, | |
1792 | "xfs_inactive: xfs_ifree() returned an error = %d on %s", | |
1793 | error, mp->m_fsname); | |
1794 | xfs_force_shutdown(mp, XFS_METADATA_IO_ERROR); | |
1795 | } | |
1796 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); | |
1797 | } else { | |
1798 | /* | |
1799 | * Credit the quota account(s). The inode is gone. | |
1800 | */ | |
1801 | XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1); | |
1802 | ||
1803 | /* | |
1804 | * Just ignore errors at this point. There is | |
1805 | * nothing we can do except to try to keep going. | |
1806 | */ | |
1807 | (void) xfs_bmap_finish(&tp, &free_list, first_block, | |
1808 | &committed); | |
1809 | (void) xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
1810 | } | |
1811 | /* | |
1812 | * Release the dquots held by inode, if any. | |
1813 | */ | |
1814 | XFS_QM_DQDETACH(mp, ip); | |
1815 | ||
1816 | xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); | |
1817 | ||
1818 | out: | |
1819 | return VN_INACTIVE_CACHE; | |
1820 | } | |
1821 | ||
1822 | ||
1823 | /* | |
1824 | * xfs_lookup | |
1825 | */ | |
1826 | STATIC int | |
1827 | xfs_lookup( | |
1828 | bhv_desc_t *dir_bdp, | |
1829 | vname_t *dentry, | |
1830 | vnode_t **vpp, | |
1831 | int flags, | |
1832 | vnode_t *rdir, | |
1833 | cred_t *credp) | |
1834 | { | |
1835 | xfs_inode_t *dp, *ip; | |
1836 | xfs_ino_t e_inum; | |
1837 | int error; | |
1838 | uint lock_mode; | |
1839 | vnode_t *dir_vp; | |
1840 | ||
1841 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
1842 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
1843 | ||
1844 | dp = XFS_BHVTOI(dir_bdp); | |
1845 | ||
1846 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) | |
1847 | return XFS_ERROR(EIO); | |
1848 | ||
1849 | lock_mode = xfs_ilock_map_shared(dp); | |
1850 | error = xfs_dir_lookup_int(dir_bdp, lock_mode, dentry, &e_inum, &ip); | |
1851 | if (!error) { | |
1852 | *vpp = XFS_ITOV(ip); | |
1853 | ITRACE(ip); | |
1854 | } | |
1855 | xfs_iunlock_map_shared(dp, lock_mode); | |
1856 | return error; | |
1857 | } | |
1858 | ||
1859 | ||
1860 | /* | |
1861 | * xfs_create (create a new file). | |
1862 | */ | |
1863 | STATIC int | |
1864 | xfs_create( | |
1865 | bhv_desc_t *dir_bdp, | |
1866 | vname_t *dentry, | |
1867 | vattr_t *vap, | |
1868 | vnode_t **vpp, | |
1869 | cred_t *credp) | |
1870 | { | |
1871 | char *name = VNAME(dentry); | |
1872 | vnode_t *dir_vp; | |
1873 | xfs_inode_t *dp, *ip; | |
1874 | vnode_t *vp=NULL; | |
1875 | xfs_trans_t *tp; | |
1876 | xfs_mount_t *mp; | |
1877 | xfs_dev_t rdev; | |
1878 | int error; | |
1879 | xfs_bmap_free_t free_list; | |
1880 | xfs_fsblock_t first_block; | |
1881 | boolean_t dp_joined_to_trans; | |
1882 | int dm_event_sent = 0; | |
1883 | uint cancel_flags; | |
1884 | int committed; | |
1885 | xfs_prid_t prid; | |
1886 | struct xfs_dquot *udqp, *gdqp; | |
1887 | uint resblks; | |
1888 | int dm_di_mode; | |
1889 | int namelen; | |
1890 | ||
1891 | ASSERT(!*vpp); | |
1892 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
1893 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
1894 | ||
1895 | dp = XFS_BHVTOI(dir_bdp); | |
1896 | mp = dp->i_mount; | |
1897 | ||
1898 | dm_di_mode = vap->va_mode|VTTOIF(vap->va_type); | |
1899 | namelen = VNAMELEN(dentry); | |
1900 | ||
1901 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) { | |
1902 | error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, | |
1903 | dir_vp, DM_RIGHT_NULL, NULL, | |
1904 | DM_RIGHT_NULL, name, NULL, | |
1905 | dm_di_mode, 0, 0); | |
1906 | ||
1907 | if (error) | |
1908 | return error; | |
1909 | dm_event_sent = 1; | |
1910 | } | |
1911 | ||
1912 | if (XFS_FORCED_SHUTDOWN(mp)) | |
1913 | return XFS_ERROR(EIO); | |
1914 | ||
1915 | /* Return through std_return after this point. */ | |
1916 | ||
1917 | udqp = gdqp = NULL; | |
1918 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) | |
1919 | prid = dp->i_d.di_projid; | |
1920 | else if (vap->va_mask & XFS_AT_PROJID) | |
1921 | prid = (xfs_prid_t)vap->va_projid; | |
1922 | else | |
1923 | prid = (xfs_prid_t)dfltprid; | |
1924 | ||
1925 | /* | |
1926 | * Make sure that we have allocated dquot(s) on disk. | |
1927 | */ | |
1928 | error = XFS_QM_DQVOPALLOC(mp, dp, | |
1929 | current_fsuid(credp), current_fsgid(credp), prid, | |
1930 | XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp); | |
1931 | if (error) | |
1932 | goto std_return; | |
1933 | ||
1934 | ip = NULL; | |
1935 | dp_joined_to_trans = B_FALSE; | |
1936 | ||
1937 | tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); | |
1938 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
1939 | resblks = XFS_CREATE_SPACE_RES(mp, namelen); | |
1940 | /* | |
1941 | * Initially assume that the file does not exist and | |
1942 | * reserve the resources for that case. If that is not | |
1943 | * the case we'll drop the one we have and get a more | |
1944 | * appropriate transaction later. | |
1945 | */ | |
1946 | error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0, | |
1947 | XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); | |
1948 | if (error == ENOSPC) { | |
1949 | resblks = 0; | |
1950 | error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0, | |
1951 | XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); | |
1952 | } | |
1953 | if (error) { | |
1954 | cancel_flags = 0; | |
1955 | dp = NULL; | |
1956 | goto error_return; | |
1957 | } | |
1958 | ||
1959 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
1960 | ||
1961 | XFS_BMAP_INIT(&free_list, &first_block); | |
1962 | ||
1963 | ASSERT(ip == NULL); | |
1964 | ||
1965 | /* | |
1966 | * Reserve disk quota and the inode. | |
1967 | */ | |
1968 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); | |
1969 | if (error) | |
1970 | goto error_return; | |
1971 | ||
1972 | if (resblks == 0 && | |
1973 | (error = XFS_DIR_CANENTER(mp, tp, dp, name, namelen))) | |
1974 | goto error_return; | |
1975 | rdev = (vap->va_mask & XFS_AT_RDEV) ? vap->va_rdev : 0; | |
1976 | error = xfs_dir_ialloc(&tp, dp, | |
1977 | MAKEIMODE(vap->va_type,vap->va_mode), 1, | |
1978 | rdev, credp, prid, resblks > 0, | |
1979 | &ip, &committed); | |
1980 | if (error) { | |
1981 | if (error == ENOSPC) | |
1982 | goto error_return; | |
1983 | goto abort_return; | |
1984 | } | |
1985 | ITRACE(ip); | |
1986 | ||
1987 | /* | |
1988 | * At this point, we've gotten a newly allocated inode. | |
1989 | * It is locked (and joined to the transaction). | |
1990 | */ | |
1991 | ||
1992 | ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE)); | |
1993 | ||
1994 | /* | |
1995 | * Now we join the directory inode to the transaction. | |
1996 | * We do not do it earlier because xfs_dir_ialloc | |
1997 | * might commit the previous transaction (and release | |
1998 | * all the locks). | |
1999 | */ | |
2000 | ||
2001 | VN_HOLD(dir_vp); | |
2002 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2003 | dp_joined_to_trans = B_TRUE; | |
2004 | ||
2005 | error = XFS_DIR_CREATENAME(mp, tp, dp, name, namelen, ip->i_ino, | |
2006 | &first_block, &free_list, | |
2007 | resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0); | |
2008 | if (error) { | |
2009 | ASSERT(error != ENOSPC); | |
2010 | goto abort_return; | |
2011 | } | |
2012 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2013 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
2014 | ||
2015 | /* | |
2016 | * If this is a synchronous mount, make sure that the | |
2017 | * create transaction goes to disk before returning to | |
2018 | * the user. | |
2019 | */ | |
2020 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2021 | xfs_trans_set_sync(tp); | |
2022 | } | |
2023 | ||
2024 | dp->i_gen++; | |
2025 | ||
2026 | /* | |
2027 | * Attach the dquot(s) to the inodes and modify them incore. | |
2028 | * These ids of the inode couldn't have changed since the new | |
2029 | * inode has been locked ever since it was created. | |
2030 | */ | |
2031 | XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp); | |
2032 | ||
2033 | /* | |
2034 | * xfs_trans_commit normally decrements the vnode ref count | |
2035 | * when it unlocks the inode. Since we want to return the | |
2036 | * vnode to the caller, we bump the vnode ref count now. | |
2037 | */ | |
2038 | IHOLD(ip); | |
2039 | vp = XFS_ITOV(ip); | |
2040 | ||
2041 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
2042 | if (error) { | |
2043 | xfs_bmap_cancel(&free_list); | |
2044 | goto abort_rele; | |
2045 | } | |
2046 | ||
2047 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2048 | if (error) { | |
2049 | IRELE(ip); | |
2050 | tp = NULL; | |
2051 | goto error_return; | |
2052 | } | |
2053 | ||
2054 | XFS_QM_DQRELE(mp, udqp); | |
2055 | XFS_QM_DQRELE(mp, gdqp); | |
2056 | ||
2057 | /* | |
2058 | * Propogate the fact that the vnode changed after the | |
2059 | * xfs_inode locks have been released. | |
2060 | */ | |
2061 | VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_TRUNCATED, 3); | |
2062 | ||
2063 | *vpp = vp; | |
2064 | ||
2065 | /* Fallthrough to std_return with error = 0 */ | |
2066 | ||
2067 | std_return: | |
2068 | if ( (*vpp || (error != 0 && dm_event_sent != 0)) && | |
2069 | DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), | |
2070 | DM_EVENT_POSTCREATE)) { | |
2071 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, | |
2072 | dir_vp, DM_RIGHT_NULL, | |
2073 | *vpp ? vp:NULL, | |
2074 | DM_RIGHT_NULL, name, NULL, | |
2075 | dm_di_mode, error, 0); | |
2076 | } | |
2077 | return error; | |
2078 | ||
2079 | abort_return: | |
2080 | cancel_flags |= XFS_TRANS_ABORT; | |
2081 | /* FALLTHROUGH */ | |
2082 | error_return: | |
2083 | ||
2084 | if (tp != NULL) | |
2085 | xfs_trans_cancel(tp, cancel_flags); | |
2086 | ||
2087 | if (!dp_joined_to_trans && (dp != NULL)) | |
2088 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2089 | XFS_QM_DQRELE(mp, udqp); | |
2090 | XFS_QM_DQRELE(mp, gdqp); | |
2091 | ||
2092 | goto std_return; | |
2093 | ||
2094 | abort_rele: | |
2095 | /* | |
2096 | * Wait until after the current transaction is aborted to | |
2097 | * release the inode. This prevents recursive transactions | |
2098 | * and deadlocks from xfs_inactive. | |
2099 | */ | |
2100 | cancel_flags |= XFS_TRANS_ABORT; | |
2101 | xfs_trans_cancel(tp, cancel_flags); | |
2102 | IRELE(ip); | |
2103 | ||
2104 | XFS_QM_DQRELE(mp, udqp); | |
2105 | XFS_QM_DQRELE(mp, gdqp); | |
2106 | ||
2107 | goto std_return; | |
2108 | } | |
2109 | ||
2110 | #ifdef DEBUG | |
2111 | /* | |
2112 | * Some counters to see if (and how often) we are hitting some deadlock | |
2113 | * prevention code paths. | |
2114 | */ | |
2115 | ||
2116 | int xfs_rm_locks; | |
2117 | int xfs_rm_lock_delays; | |
2118 | int xfs_rm_attempts; | |
2119 | #endif | |
2120 | ||
2121 | /* | |
2122 | * The following routine will lock the inodes associated with the | |
2123 | * directory and the named entry in the directory. The locks are | |
2124 | * acquired in increasing inode number. | |
2125 | * | |
2126 | * If the entry is "..", then only the directory is locked. The | |
2127 | * vnode ref count will still include that from the .. entry in | |
2128 | * this case. | |
2129 | * | |
2130 | * There is a deadlock we need to worry about. If the locked directory is | |
2131 | * in the AIL, it might be blocking up the log. The next inode we lock | |
2132 | * could be already locked by another thread waiting for log space (e.g | |
2133 | * a permanent log reservation with a long running transaction (see | |
2134 | * xfs_itruncate_finish)). To solve this, we must check if the directory | |
2135 | * is in the ail and use lock_nowait. If we can't lock, we need to | |
2136 | * drop the inode lock on the directory and try again. xfs_iunlock will | |
2137 | * potentially push the tail if we were holding up the log. | |
2138 | */ | |
2139 | STATIC int | |
2140 | xfs_lock_dir_and_entry( | |
2141 | xfs_inode_t *dp, | |
2142 | vname_t *dentry, | |
2143 | xfs_inode_t *ip) /* inode of entry 'name' */ | |
2144 | { | |
2145 | int attempts; | |
2146 | xfs_ino_t e_inum; | |
2147 | xfs_inode_t *ips[2]; | |
2148 | xfs_log_item_t *lp; | |
2149 | ||
2150 | #ifdef DEBUG | |
2151 | xfs_rm_locks++; | |
2152 | #endif | |
2153 | attempts = 0; | |
2154 | ||
2155 | again: | |
2156 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
2157 | ||
2158 | e_inum = ip->i_ino; | |
2159 | ||
2160 | ITRACE(ip); | |
2161 | ||
2162 | /* | |
2163 | * We want to lock in increasing inum. Since we've already | |
2164 | * acquired the lock on the directory, we may need to release | |
2165 | * if if the inum of the entry turns out to be less. | |
2166 | */ | |
2167 | if (e_inum > dp->i_ino) { | |
2168 | /* | |
2169 | * We are already in the right order, so just | |
2170 | * lock on the inode of the entry. | |
2171 | * We need to use nowait if dp is in the AIL. | |
2172 | */ | |
2173 | ||
2174 | lp = (xfs_log_item_t *)dp->i_itemp; | |
2175 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { | |
2176 | if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { | |
2177 | attempts++; | |
2178 | #ifdef DEBUG | |
2179 | xfs_rm_attempts++; | |
2180 | #endif | |
2181 | ||
2182 | /* | |
2183 | * Unlock dp and try again. | |
2184 | * xfs_iunlock will try to push the tail | |
2185 | * if the inode is in the AIL. | |
2186 | */ | |
2187 | ||
2188 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2189 | ||
2190 | if ((attempts % 5) == 0) { | |
2191 | delay(1); /* Don't just spin the CPU */ | |
2192 | #ifdef DEBUG | |
2193 | xfs_rm_lock_delays++; | |
2194 | #endif | |
2195 | } | |
2196 | goto again; | |
2197 | } | |
2198 | } else { | |
2199 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
2200 | } | |
2201 | } else if (e_inum < dp->i_ino) { | |
2202 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2203 | ||
2204 | ips[0] = ip; | |
2205 | ips[1] = dp; | |
2206 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
2207 | } | |
2208 | /* else e_inum == dp->i_ino */ | |
2209 | /* This can happen if we're asked to lock /x/.. | |
2210 | * the entry is "..", which is also the parent directory. | |
2211 | */ | |
2212 | ||
2213 | return 0; | |
2214 | } | |
2215 | ||
2216 | #ifdef DEBUG | |
2217 | int xfs_locked_n; | |
2218 | int xfs_small_retries; | |
2219 | int xfs_middle_retries; | |
2220 | int xfs_lots_retries; | |
2221 | int xfs_lock_delays; | |
2222 | #endif | |
2223 | ||
2224 | /* | |
2225 | * The following routine will lock n inodes in exclusive mode. | |
2226 | * We assume the caller calls us with the inodes in i_ino order. | |
2227 | * | |
2228 | * We need to detect deadlock where an inode that we lock | |
2229 | * is in the AIL and we start waiting for another inode that is locked | |
2230 | * by a thread in a long running transaction (such as truncate). This can | |
2231 | * result in deadlock since the long running trans might need to wait | |
2232 | * for the inode we just locked in order to push the tail and free space | |
2233 | * in the log. | |
2234 | */ | |
2235 | void | |
2236 | xfs_lock_inodes( | |
2237 | xfs_inode_t **ips, | |
2238 | int inodes, | |
2239 | int first_locked, | |
2240 | uint lock_mode) | |
2241 | { | |
2242 | int attempts = 0, i, j, try_lock; | |
2243 | xfs_log_item_t *lp; | |
2244 | ||
2245 | ASSERT(ips && (inodes >= 2)); /* we need at least two */ | |
2246 | ||
2247 | if (first_locked) { | |
2248 | try_lock = 1; | |
2249 | i = 1; | |
2250 | } else { | |
2251 | try_lock = 0; | |
2252 | i = 0; | |
2253 | } | |
2254 | ||
2255 | again: | |
2256 | for (; i < inodes; i++) { | |
2257 | ASSERT(ips[i]); | |
2258 | ||
2259 | if (i && (ips[i] == ips[i-1])) /* Already locked */ | |
2260 | continue; | |
2261 | ||
2262 | /* | |
2263 | * If try_lock is not set yet, make sure all locked inodes | |
2264 | * are not in the AIL. | |
2265 | * If any are, set try_lock to be used later. | |
2266 | */ | |
2267 | ||
2268 | if (!try_lock) { | |
2269 | for (j = (i - 1); j >= 0 && !try_lock; j--) { | |
2270 | lp = (xfs_log_item_t *)ips[j]->i_itemp; | |
2271 | if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { | |
2272 | try_lock++; | |
2273 | } | |
2274 | } | |
2275 | } | |
2276 | ||
2277 | /* | |
2278 | * If any of the previous locks we have locked is in the AIL, | |
2279 | * we must TRY to get the second and subsequent locks. If | |
2280 | * we can't get any, we must release all we have | |
2281 | * and try again. | |
2282 | */ | |
2283 | ||
2284 | if (try_lock) { | |
2285 | /* try_lock must be 0 if i is 0. */ | |
2286 | /* | |
2287 | * try_lock means we have an inode locked | |
2288 | * that is in the AIL. | |
2289 | */ | |
2290 | ASSERT(i != 0); | |
2291 | if (!xfs_ilock_nowait(ips[i], lock_mode)) { | |
2292 | attempts++; | |
2293 | ||
2294 | /* | |
2295 | * Unlock all previous guys and try again. | |
2296 | * xfs_iunlock will try to push the tail | |
2297 | * if the inode is in the AIL. | |
2298 | */ | |
2299 | ||
2300 | for(j = i - 1; j >= 0; j--) { | |
2301 | ||
2302 | /* | |
2303 | * Check to see if we've already | |
2304 | * unlocked this one. | |
2305 | * Not the first one going back, | |
2306 | * and the inode ptr is the same. | |
2307 | */ | |
2308 | if ((j != (i - 1)) && ips[j] == | |
2309 | ips[j+1]) | |
2310 | continue; | |
2311 | ||
2312 | xfs_iunlock(ips[j], lock_mode); | |
2313 | } | |
2314 | ||
2315 | if ((attempts % 5) == 0) { | |
2316 | delay(1); /* Don't just spin the CPU */ | |
2317 | #ifdef DEBUG | |
2318 | xfs_lock_delays++; | |
2319 | #endif | |
2320 | } | |
2321 | i = 0; | |
2322 | try_lock = 0; | |
2323 | goto again; | |
2324 | } | |
2325 | } else { | |
2326 | xfs_ilock(ips[i], lock_mode); | |
2327 | } | |
2328 | } | |
2329 | ||
2330 | #ifdef DEBUG | |
2331 | if (attempts) { | |
2332 | if (attempts < 5) xfs_small_retries++; | |
2333 | else if (attempts < 100) xfs_middle_retries++; | |
2334 | else xfs_lots_retries++; | |
2335 | } else { | |
2336 | xfs_locked_n++; | |
2337 | } | |
2338 | #endif | |
2339 | } | |
2340 | ||
2341 | #ifdef DEBUG | |
2342 | #define REMOVE_DEBUG_TRACE(x) {remove_which_error_return = (x);} | |
2343 | int remove_which_error_return = 0; | |
2344 | #else /* ! DEBUG */ | |
2345 | #define REMOVE_DEBUG_TRACE(x) | |
2346 | #endif /* ! DEBUG */ | |
2347 | ||
2348 | ||
2349 | /* | |
2350 | * xfs_remove | |
2351 | * | |
2352 | */ | |
2353 | STATIC int | |
2354 | xfs_remove( | |
2355 | bhv_desc_t *dir_bdp, | |
2356 | vname_t *dentry, | |
2357 | cred_t *credp) | |
2358 | { | |
2359 | vnode_t *dir_vp; | |
2360 | char *name = VNAME(dentry); | |
2361 | xfs_inode_t *dp, *ip; | |
2362 | xfs_trans_t *tp = NULL; | |
2363 | xfs_mount_t *mp; | |
2364 | int error = 0; | |
2365 | xfs_bmap_free_t free_list; | |
2366 | xfs_fsblock_t first_block; | |
2367 | int cancel_flags; | |
2368 | int committed; | |
2369 | int dm_di_mode = 0; | |
2370 | int link_zero; | |
2371 | uint resblks; | |
2372 | int namelen; | |
2373 | ||
2374 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
2375 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
2376 | ||
2377 | dp = XFS_BHVTOI(dir_bdp); | |
2378 | mp = dp->i_mount; | |
2379 | ||
2380 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2381 | return XFS_ERROR(EIO); | |
2382 | ||
2383 | namelen = VNAMELEN(dentry); | |
2384 | ||
2385 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) { | |
2386 | error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp, | |
2387 | DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, | |
2388 | name, NULL, 0, 0, 0); | |
2389 | if (error) | |
2390 | return error; | |
2391 | } | |
2392 | ||
2393 | /* From this point on, return through std_return */ | |
2394 | ip = NULL; | |
2395 | ||
2396 | /* | |
2397 | * We need to get a reference to ip before we get our log | |
2398 | * reservation. The reason for this is that we cannot call | |
2399 | * xfs_iget for an inode for which we do not have a reference | |
2400 | * once we've acquired a log reservation. This is because the | |
2401 | * inode we are trying to get might be in xfs_inactive going | |
2402 | * for a log reservation. Since we'll have to wait for the | |
2403 | * inactive code to complete before returning from xfs_iget, | |
2404 | * we need to make sure that we don't have log space reserved | |
2405 | * when we call xfs_iget. Instead we get an unlocked referece | |
2406 | * to the inode before getting our log reservation. | |
2407 | */ | |
2408 | error = xfs_get_dir_entry(dentry, &ip); | |
2409 | if (error) { | |
2410 | REMOVE_DEBUG_TRACE(__LINE__); | |
2411 | goto std_return; | |
2412 | } | |
2413 | ||
2414 | dm_di_mode = ip->i_d.di_mode; | |
2415 | ||
2416 | vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); | |
2417 | ||
2418 | ITRACE(ip); | |
2419 | ||
2420 | error = XFS_QM_DQATTACH(mp, dp, 0); | |
2421 | if (!error && dp != ip) | |
2422 | error = XFS_QM_DQATTACH(mp, ip, 0); | |
2423 | if (error) { | |
2424 | REMOVE_DEBUG_TRACE(__LINE__); | |
2425 | IRELE(ip); | |
2426 | goto std_return; | |
2427 | } | |
2428 | ||
2429 | tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); | |
2430 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
2431 | /* | |
2432 | * We try to get the real space reservation first, | |
2433 | * allowing for directory btree deletion(s) implying | |
2434 | * possible bmap insert(s). If we can't get the space | |
2435 | * reservation then we use 0 instead, and avoid the bmap | |
2436 | * btree insert(s) in the directory code by, if the bmap | |
2437 | * insert tries to happen, instead trimming the LAST | |
2438 | * block from the directory. | |
2439 | */ | |
2440 | resblks = XFS_REMOVE_SPACE_RES(mp); | |
2441 | error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, | |
2442 | XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT); | |
2443 | if (error == ENOSPC) { | |
2444 | resblks = 0; | |
2445 | error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, | |
2446 | XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT); | |
2447 | } | |
2448 | if (error) { | |
2449 | ASSERT(error != ENOSPC); | |
2450 | REMOVE_DEBUG_TRACE(__LINE__); | |
2451 | xfs_trans_cancel(tp, 0); | |
2452 | IRELE(ip); | |
2453 | return error; | |
2454 | } | |
2455 | ||
2456 | error = xfs_lock_dir_and_entry(dp, dentry, ip); | |
2457 | if (error) { | |
2458 | REMOVE_DEBUG_TRACE(__LINE__); | |
2459 | xfs_trans_cancel(tp, cancel_flags); | |
2460 | IRELE(ip); | |
2461 | goto std_return; | |
2462 | } | |
2463 | ||
2464 | /* | |
2465 | * At this point, we've gotten both the directory and the entry | |
2466 | * inodes locked. | |
2467 | */ | |
2468 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2469 | if (dp != ip) { | |
2470 | /* | |
2471 | * Increment vnode ref count only in this case since | |
2472 | * there's an extra vnode reference in the case where | |
2473 | * dp == ip. | |
2474 | */ | |
2475 | IHOLD(dp); | |
2476 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
2477 | } | |
2478 | ||
2479 | /* | |
2480 | * Entry must exist since we did a lookup in xfs_lock_dir_and_entry. | |
2481 | */ | |
2482 | XFS_BMAP_INIT(&free_list, &first_block); | |
2483 | error = XFS_DIR_REMOVENAME(mp, tp, dp, name, namelen, ip->i_ino, | |
2484 | &first_block, &free_list, 0); | |
2485 | if (error) { | |
2486 | ASSERT(error != ENOENT); | |
2487 | REMOVE_DEBUG_TRACE(__LINE__); | |
2488 | goto error1; | |
2489 | } | |
2490 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2491 | ||
2492 | dp->i_gen++; | |
2493 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
2494 | ||
2495 | error = xfs_droplink(tp, ip); | |
2496 | if (error) { | |
2497 | REMOVE_DEBUG_TRACE(__LINE__); | |
2498 | goto error1; | |
2499 | } | |
2500 | ||
2501 | /* Determine if this is the last link while | |
2502 | * we are in the transaction. | |
2503 | */ | |
2504 | link_zero = (ip)->i_d.di_nlink==0; | |
2505 | ||
2506 | /* | |
2507 | * Take an extra ref on the inode so that it doesn't | |
2508 | * go to xfs_inactive() from within the commit. | |
2509 | */ | |
2510 | IHOLD(ip); | |
2511 | ||
2512 | /* | |
2513 | * If this is a synchronous mount, make sure that the | |
2514 | * remove transaction goes to disk before returning to | |
2515 | * the user. | |
2516 | */ | |
2517 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2518 | xfs_trans_set_sync(tp); | |
2519 | } | |
2520 | ||
2521 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
2522 | if (error) { | |
2523 | REMOVE_DEBUG_TRACE(__LINE__); | |
2524 | goto error_rele; | |
2525 | } | |
2526 | ||
2527 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2528 | if (error) { | |
2529 | IRELE(ip); | |
2530 | goto std_return; | |
2531 | } | |
2532 | ||
2533 | /* | |
2534 | * Before we drop our extra reference to the inode, purge it | |
2535 | * from the refcache if it is there. By waiting until afterwards | |
2536 | * to do the IRELE, we ensure that we won't go inactive in the | |
2537 | * xfs_refcache_purge_ip routine (although that would be OK). | |
2538 | */ | |
2539 | xfs_refcache_purge_ip(ip); | |
2540 | ||
2541 | vn_trace_exit(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); | |
2542 | ||
2543 | /* | |
2544 | * Let interposed file systems know about removed links. | |
2545 | */ | |
2546 | VOP_LINK_REMOVED(XFS_ITOV(ip), dir_vp, link_zero); | |
2547 | ||
2548 | IRELE(ip); | |
2549 | ||
2550 | /* Fall through to std_return with error = 0 */ | |
2551 | std_return: | |
2552 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, | |
2553 | DM_EVENT_POSTREMOVE)) { | |
2554 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, | |
2555 | dir_vp, DM_RIGHT_NULL, | |
2556 | NULL, DM_RIGHT_NULL, | |
2557 | name, NULL, dm_di_mode, error, 0); | |
2558 | } | |
2559 | return error; | |
2560 | ||
2561 | error1: | |
2562 | xfs_bmap_cancel(&free_list); | |
2563 | cancel_flags |= XFS_TRANS_ABORT; | |
2564 | xfs_trans_cancel(tp, cancel_flags); | |
2565 | goto std_return; | |
2566 | ||
2567 | error_rele: | |
2568 | /* | |
2569 | * In this case make sure to not release the inode until after | |
2570 | * the current transaction is aborted. Releasing it beforehand | |
2571 | * can cause us to go to xfs_inactive and start a recursive | |
2572 | * transaction which can easily deadlock with the current one. | |
2573 | */ | |
2574 | xfs_bmap_cancel(&free_list); | |
2575 | cancel_flags |= XFS_TRANS_ABORT; | |
2576 | xfs_trans_cancel(tp, cancel_flags); | |
2577 | ||
2578 | /* | |
2579 | * Before we drop our extra reference to the inode, purge it | |
2580 | * from the refcache if it is there. By waiting until afterwards | |
2581 | * to do the IRELE, we ensure that we won't go inactive in the | |
2582 | * xfs_refcache_purge_ip routine (although that would be OK). | |
2583 | */ | |
2584 | xfs_refcache_purge_ip(ip); | |
2585 | ||
2586 | IRELE(ip); | |
2587 | ||
2588 | goto std_return; | |
2589 | } | |
2590 | ||
2591 | ||
2592 | /* | |
2593 | * xfs_link | |
2594 | * | |
2595 | */ | |
2596 | STATIC int | |
2597 | xfs_link( | |
2598 | bhv_desc_t *target_dir_bdp, | |
2599 | vnode_t *src_vp, | |
2600 | vname_t *dentry, | |
2601 | cred_t *credp) | |
2602 | { | |
2603 | xfs_inode_t *tdp, *sip; | |
2604 | xfs_trans_t *tp; | |
2605 | xfs_mount_t *mp; | |
2606 | xfs_inode_t *ips[2]; | |
2607 | int error; | |
2608 | xfs_bmap_free_t free_list; | |
2609 | xfs_fsblock_t first_block; | |
2610 | int cancel_flags; | |
2611 | int committed; | |
2612 | vnode_t *target_dir_vp; | |
2613 | bhv_desc_t *src_bdp; | |
2614 | int resblks; | |
2615 | char *target_name = VNAME(dentry); | |
2616 | int target_namelen; | |
2617 | ||
2618 | target_dir_vp = BHV_TO_VNODE(target_dir_bdp); | |
2619 | vn_trace_entry(target_dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
2620 | vn_trace_entry(src_vp, __FUNCTION__, (inst_t *)__return_address); | |
2621 | ||
2622 | target_namelen = VNAMELEN(dentry); | |
2623 | if (src_vp->v_type == VDIR) | |
2624 | return XFS_ERROR(EPERM); | |
2625 | ||
2626 | src_bdp = vn_bhv_lookup_unlocked(VN_BHV_HEAD(src_vp), &xfs_vnodeops); | |
2627 | sip = XFS_BHVTOI(src_bdp); | |
2628 | tdp = XFS_BHVTOI(target_dir_bdp); | |
2629 | mp = tdp->i_mount; | |
2630 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2631 | return XFS_ERROR(EIO); | |
2632 | ||
2633 | if (DM_EVENT_ENABLED(src_vp->v_vfsp, tdp, DM_EVENT_LINK)) { | |
2634 | error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK, | |
2635 | target_dir_vp, DM_RIGHT_NULL, | |
2636 | src_vp, DM_RIGHT_NULL, | |
2637 | target_name, NULL, 0, 0, 0); | |
2638 | if (error) | |
2639 | return error; | |
2640 | } | |
2641 | ||
2642 | /* Return through std_return after this point. */ | |
2643 | ||
2644 | error = XFS_QM_DQATTACH(mp, sip, 0); | |
2645 | if (!error && sip != tdp) | |
2646 | error = XFS_QM_DQATTACH(mp, tdp, 0); | |
2647 | if (error) | |
2648 | goto std_return; | |
2649 | ||
2650 | tp = xfs_trans_alloc(mp, XFS_TRANS_LINK); | |
2651 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
2652 | resblks = XFS_LINK_SPACE_RES(mp, target_namelen); | |
2653 | error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0, | |
2654 | XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); | |
2655 | if (error == ENOSPC) { | |
2656 | resblks = 0; | |
2657 | error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0, | |
2658 | XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); | |
2659 | } | |
2660 | if (error) { | |
2661 | cancel_flags = 0; | |
2662 | goto error_return; | |
2663 | } | |
2664 | ||
2665 | if (sip->i_ino < tdp->i_ino) { | |
2666 | ips[0] = sip; | |
2667 | ips[1] = tdp; | |
2668 | } else { | |
2669 | ips[0] = tdp; | |
2670 | ips[1] = sip; | |
2671 | } | |
2672 | ||
2673 | xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); | |
2674 | ||
2675 | /* | |
2676 | * Increment vnode ref counts since xfs_trans_commit & | |
2677 | * xfs_trans_cancel will both unlock the inodes and | |
2678 | * decrement the associated ref counts. | |
2679 | */ | |
2680 | VN_HOLD(src_vp); | |
2681 | VN_HOLD(target_dir_vp); | |
2682 | xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL); | |
2683 | xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); | |
2684 | ||
2685 | /* | |
2686 | * If the source has too many links, we can't make any more to it. | |
2687 | */ | |
2688 | if (sip->i_d.di_nlink >= XFS_MAXLINK) { | |
2689 | error = XFS_ERROR(EMLINK); | |
2690 | goto error_return; | |
2691 | } | |
2692 | ||
2693 | /* | |
2694 | * If we are using project inheritance, we only allow hard link | |
2695 | * creation in our tree when the project IDs are the same; else | |
2696 | * the tree quota mechanism could be circumvented. | |
2697 | */ | |
2698 | if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && | |
2699 | (tdp->i_d.di_projid != sip->i_d.di_projid))) { | |
2700 | error = XFS_ERROR(EPERM); | |
2701 | goto error_return; | |
2702 | } | |
2703 | ||
2704 | if (resblks == 0 && | |
2705 | (error = XFS_DIR_CANENTER(mp, tp, tdp, target_name, | |
2706 | target_namelen))) | |
2707 | goto error_return; | |
2708 | ||
2709 | XFS_BMAP_INIT(&free_list, &first_block); | |
2710 | ||
2711 | error = XFS_DIR_CREATENAME(mp, tp, tdp, target_name, target_namelen, | |
2712 | sip->i_ino, &first_block, &free_list, | |
2713 | resblks); | |
2714 | if (error) | |
2715 | goto abort_return; | |
2716 | xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2717 | tdp->i_gen++; | |
2718 | xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); | |
2719 | ||
2720 | error = xfs_bumplink(tp, sip); | |
2721 | if (error) { | |
2722 | goto abort_return; | |
2723 | } | |
2724 | ||
2725 | /* | |
2726 | * If this is a synchronous mount, make sure that the | |
2727 | * link transaction goes to disk before returning to | |
2728 | * the user. | |
2729 | */ | |
2730 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2731 | xfs_trans_set_sync(tp); | |
2732 | } | |
2733 | ||
2734 | error = xfs_bmap_finish (&tp, &free_list, first_block, &committed); | |
2735 | if (error) { | |
2736 | xfs_bmap_cancel(&free_list); | |
2737 | goto abort_return; | |
2738 | } | |
2739 | ||
2740 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2741 | if (error) { | |
2742 | goto std_return; | |
2743 | } | |
2744 | ||
2745 | /* Fall through to std_return with error = 0. */ | |
2746 | std_return: | |
2747 | if (DM_EVENT_ENABLED(src_vp->v_vfsp, sip, | |
2748 | DM_EVENT_POSTLINK)) { | |
2749 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK, | |
2750 | target_dir_vp, DM_RIGHT_NULL, | |
2751 | src_vp, DM_RIGHT_NULL, | |
2752 | target_name, NULL, 0, error, 0); | |
2753 | } | |
2754 | return error; | |
2755 | ||
2756 | abort_return: | |
2757 | cancel_flags |= XFS_TRANS_ABORT; | |
2758 | /* FALLTHROUGH */ | |
2759 | error_return: | |
2760 | xfs_trans_cancel(tp, cancel_flags); | |
2761 | ||
2762 | goto std_return; | |
2763 | } | |
2764 | /* | |
2765 | * xfs_mkdir | |
2766 | * | |
2767 | */ | |
2768 | STATIC int | |
2769 | xfs_mkdir( | |
2770 | bhv_desc_t *dir_bdp, | |
2771 | vname_t *dentry, | |
2772 | vattr_t *vap, | |
2773 | vnode_t **vpp, | |
2774 | cred_t *credp) | |
2775 | { | |
2776 | char *dir_name = VNAME(dentry); | |
2777 | xfs_inode_t *dp; | |
2778 | xfs_inode_t *cdp; /* inode of created dir */ | |
2779 | vnode_t *cvp; /* vnode of created dir */ | |
2780 | xfs_trans_t *tp; | |
2781 | xfs_mount_t *mp; | |
2782 | int cancel_flags; | |
2783 | int error; | |
2784 | int committed; | |
2785 | xfs_bmap_free_t free_list; | |
2786 | xfs_fsblock_t first_block; | |
2787 | vnode_t *dir_vp; | |
2788 | boolean_t dp_joined_to_trans; | |
2789 | boolean_t created = B_FALSE; | |
2790 | int dm_event_sent = 0; | |
2791 | xfs_prid_t prid; | |
2792 | struct xfs_dquot *udqp, *gdqp; | |
2793 | uint resblks; | |
2794 | int dm_di_mode; | |
2795 | int dir_namelen; | |
2796 | ||
2797 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
2798 | dp = XFS_BHVTOI(dir_bdp); | |
2799 | mp = dp->i_mount; | |
2800 | ||
2801 | if (XFS_FORCED_SHUTDOWN(mp)) | |
2802 | return XFS_ERROR(EIO); | |
2803 | ||
2804 | dir_namelen = VNAMELEN(dentry); | |
2805 | ||
2806 | tp = NULL; | |
2807 | dp_joined_to_trans = B_FALSE; | |
2808 | dm_di_mode = vap->va_mode|VTTOIF(vap->va_type); | |
2809 | ||
2810 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) { | |
2811 | error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, | |
2812 | dir_vp, DM_RIGHT_NULL, NULL, | |
2813 | DM_RIGHT_NULL, dir_name, NULL, | |
2814 | dm_di_mode, 0, 0); | |
2815 | if (error) | |
2816 | return error; | |
2817 | dm_event_sent = 1; | |
2818 | } | |
2819 | ||
2820 | /* Return through std_return after this point. */ | |
2821 | ||
2822 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
2823 | ||
2824 | mp = dp->i_mount; | |
2825 | udqp = gdqp = NULL; | |
2826 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) | |
2827 | prid = dp->i_d.di_projid; | |
2828 | else if (vap->va_mask & XFS_AT_PROJID) | |
2829 | prid = (xfs_prid_t)vap->va_projid; | |
2830 | else | |
2831 | prid = (xfs_prid_t)dfltprid; | |
2832 | ||
2833 | /* | |
2834 | * Make sure that we have allocated dquot(s) on disk. | |
2835 | */ | |
2836 | error = XFS_QM_DQVOPALLOC(mp, dp, | |
2837 | current_fsuid(credp), current_fsgid(credp), prid, | |
2838 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); | |
2839 | if (error) | |
2840 | goto std_return; | |
2841 | ||
2842 | tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); | |
2843 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
2844 | resblks = XFS_MKDIR_SPACE_RES(mp, dir_namelen); | |
2845 | error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0, | |
2846 | XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT); | |
2847 | if (error == ENOSPC) { | |
2848 | resblks = 0; | |
2849 | error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0, | |
2850 | XFS_TRANS_PERM_LOG_RES, | |
2851 | XFS_MKDIR_LOG_COUNT); | |
2852 | } | |
2853 | if (error) { | |
2854 | cancel_flags = 0; | |
2855 | dp = NULL; | |
2856 | goto error_return; | |
2857 | } | |
2858 | ||
2859 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
2860 | ||
2861 | /* | |
2862 | * Check for directory link count overflow. | |
2863 | */ | |
2864 | if (dp->i_d.di_nlink >= XFS_MAXLINK) { | |
2865 | error = XFS_ERROR(EMLINK); | |
2866 | goto error_return; | |
2867 | } | |
2868 | ||
2869 | /* | |
2870 | * Reserve disk quota and the inode. | |
2871 | */ | |
2872 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); | |
2873 | if (error) | |
2874 | goto error_return; | |
2875 | ||
2876 | if (resblks == 0 && | |
2877 | (error = XFS_DIR_CANENTER(mp, tp, dp, dir_name, dir_namelen))) | |
2878 | goto error_return; | |
2879 | /* | |
2880 | * create the directory inode. | |
2881 | */ | |
2882 | error = xfs_dir_ialloc(&tp, dp, | |
2883 | MAKEIMODE(vap->va_type,vap->va_mode), 2, | |
2884 | 0, credp, prid, resblks > 0, | |
2885 | &cdp, NULL); | |
2886 | if (error) { | |
2887 | if (error == ENOSPC) | |
2888 | goto error_return; | |
2889 | goto abort_return; | |
2890 | } | |
2891 | ITRACE(cdp); | |
2892 | ||
2893 | /* | |
2894 | * Now we add the directory inode to the transaction. | |
2895 | * We waited until now since xfs_dir_ialloc might start | |
2896 | * a new transaction. Had we joined the transaction | |
2897 | * earlier, the locks might have gotten released. | |
2898 | */ | |
2899 | VN_HOLD(dir_vp); | |
2900 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
2901 | dp_joined_to_trans = B_TRUE; | |
2902 | ||
2903 | XFS_BMAP_INIT(&free_list, &first_block); | |
2904 | ||
2905 | error = XFS_DIR_CREATENAME(mp, tp, dp, dir_name, dir_namelen, | |
2906 | cdp->i_ino, &first_block, &free_list, | |
2907 | resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0); | |
2908 | if (error) { | |
2909 | ASSERT(error != ENOSPC); | |
2910 | goto error1; | |
2911 | } | |
2912 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
2913 | ||
2914 | /* | |
2915 | * Bump the in memory version number of the parent directory | |
2916 | * so that other processes accessing it will recognize that | |
2917 | * the directory has changed. | |
2918 | */ | |
2919 | dp->i_gen++; | |
2920 | ||
2921 | error = XFS_DIR_INIT(mp, tp, cdp, dp); | |
2922 | if (error) { | |
2923 | goto error2; | |
2924 | } | |
2925 | ||
2926 | cdp->i_gen = 1; | |
2927 | error = xfs_bumplink(tp, dp); | |
2928 | if (error) { | |
2929 | goto error2; | |
2930 | } | |
2931 | ||
2932 | cvp = XFS_ITOV(cdp); | |
2933 | ||
2934 | created = B_TRUE; | |
2935 | ||
2936 | *vpp = cvp; | |
2937 | IHOLD(cdp); | |
2938 | ||
2939 | /* | |
2940 | * Attach the dquots to the new inode and modify the icount incore. | |
2941 | */ | |
2942 | XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp); | |
2943 | ||
2944 | /* | |
2945 | * If this is a synchronous mount, make sure that the | |
2946 | * mkdir transaction goes to disk before returning to | |
2947 | * the user. | |
2948 | */ | |
2949 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
2950 | xfs_trans_set_sync(tp); | |
2951 | } | |
2952 | ||
2953 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
2954 | if (error) { | |
2955 | IRELE(cdp); | |
2956 | goto error2; | |
2957 | } | |
2958 | ||
2959 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
2960 | XFS_QM_DQRELE(mp, udqp); | |
2961 | XFS_QM_DQRELE(mp, gdqp); | |
2962 | if (error) { | |
2963 | IRELE(cdp); | |
2964 | } | |
2965 | ||
2966 | /* Fall through to std_return with error = 0 or errno from | |
2967 | * xfs_trans_commit. */ | |
2968 | ||
2969 | std_return: | |
2970 | if ( (created || (error != 0 && dm_event_sent != 0)) && | |
2971 | DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), | |
2972 | DM_EVENT_POSTCREATE)) { | |
2973 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, | |
2974 | dir_vp, DM_RIGHT_NULL, | |
2975 | created ? XFS_ITOV(cdp):NULL, | |
2976 | DM_RIGHT_NULL, | |
2977 | dir_name, NULL, | |
2978 | dm_di_mode, error, 0); | |
2979 | } | |
2980 | return error; | |
2981 | ||
2982 | error2: | |
2983 | error1: | |
2984 | xfs_bmap_cancel(&free_list); | |
2985 | abort_return: | |
2986 | cancel_flags |= XFS_TRANS_ABORT; | |
2987 | error_return: | |
2988 | xfs_trans_cancel(tp, cancel_flags); | |
2989 | XFS_QM_DQRELE(mp, udqp); | |
2990 | XFS_QM_DQRELE(mp, gdqp); | |
2991 | ||
2992 | if (!dp_joined_to_trans && (dp != NULL)) { | |
2993 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
2994 | } | |
2995 | ||
2996 | goto std_return; | |
2997 | } | |
2998 | ||
2999 | ||
3000 | /* | |
3001 | * xfs_rmdir | |
3002 | * | |
3003 | */ | |
3004 | STATIC int | |
3005 | xfs_rmdir( | |
3006 | bhv_desc_t *dir_bdp, | |
3007 | vname_t *dentry, | |
3008 | cred_t *credp) | |
3009 | { | |
3010 | char *name = VNAME(dentry); | |
3011 | xfs_inode_t *dp; | |
3012 | xfs_inode_t *cdp; /* child directory */ | |
3013 | xfs_trans_t *tp; | |
3014 | xfs_mount_t *mp; | |
3015 | int error; | |
3016 | xfs_bmap_free_t free_list; | |
3017 | xfs_fsblock_t first_block; | |
3018 | int cancel_flags; | |
3019 | int committed; | |
3020 | vnode_t *dir_vp; | |
3021 | int dm_di_mode = 0; | |
3022 | int last_cdp_link; | |
3023 | int namelen; | |
3024 | uint resblks; | |
3025 | ||
3026 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
3027 | dp = XFS_BHVTOI(dir_bdp); | |
3028 | mp = dp->i_mount; | |
3029 | ||
3030 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
3031 | ||
3032 | if (XFS_FORCED_SHUTDOWN(XFS_BHVTOI(dir_bdp)->i_mount)) | |
3033 | return XFS_ERROR(EIO); | |
3034 | namelen = VNAMELEN(dentry); | |
3035 | ||
3036 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) { | |
3037 | error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, | |
3038 | dir_vp, DM_RIGHT_NULL, | |
3039 | NULL, DM_RIGHT_NULL, | |
3040 | name, NULL, 0, 0, 0); | |
3041 | if (error) | |
3042 | return XFS_ERROR(error); | |
3043 | } | |
3044 | ||
3045 | /* Return through std_return after this point. */ | |
3046 | ||
3047 | cdp = NULL; | |
3048 | ||
3049 | /* | |
3050 | * We need to get a reference to cdp before we get our log | |
3051 | * reservation. The reason for this is that we cannot call | |
3052 | * xfs_iget for an inode for which we do not have a reference | |
3053 | * once we've acquired a log reservation. This is because the | |
3054 | * inode we are trying to get might be in xfs_inactive going | |
3055 | * for a log reservation. Since we'll have to wait for the | |
3056 | * inactive code to complete before returning from xfs_iget, | |
3057 | * we need to make sure that we don't have log space reserved | |
3058 | * when we call xfs_iget. Instead we get an unlocked referece | |
3059 | * to the inode before getting our log reservation. | |
3060 | */ | |
3061 | error = xfs_get_dir_entry(dentry, &cdp); | |
3062 | if (error) { | |
3063 | REMOVE_DEBUG_TRACE(__LINE__); | |
3064 | goto std_return; | |
3065 | } | |
3066 | mp = dp->i_mount; | |
3067 | dm_di_mode = cdp->i_d.di_mode; | |
3068 | ||
3069 | /* | |
3070 | * Get the dquots for the inodes. | |
3071 | */ | |
3072 | error = XFS_QM_DQATTACH(mp, dp, 0); | |
3073 | if (!error && dp != cdp) | |
3074 | error = XFS_QM_DQATTACH(mp, cdp, 0); | |
3075 | if (error) { | |
3076 | IRELE(cdp); | |
3077 | REMOVE_DEBUG_TRACE(__LINE__); | |
3078 | goto std_return; | |
3079 | } | |
3080 | ||
3081 | tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); | |
3082 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
3083 | /* | |
3084 | * We try to get the real space reservation first, | |
3085 | * allowing for directory btree deletion(s) implying | |
3086 | * possible bmap insert(s). If we can't get the space | |
3087 | * reservation then we use 0 instead, and avoid the bmap | |
3088 | * btree insert(s) in the directory code by, if the bmap | |
3089 | * insert tries to happen, instead trimming the LAST | |
3090 | * block from the directory. | |
3091 | */ | |
3092 | resblks = XFS_REMOVE_SPACE_RES(mp); | |
3093 | error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, | |
3094 | XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT); | |
3095 | if (error == ENOSPC) { | |
3096 | resblks = 0; | |
3097 | error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, | |
3098 | XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT); | |
3099 | } | |
3100 | if (error) { | |
3101 | ASSERT(error != ENOSPC); | |
3102 | cancel_flags = 0; | |
3103 | IRELE(cdp); | |
3104 | goto error_return; | |
3105 | } | |
3106 | XFS_BMAP_INIT(&free_list, &first_block); | |
3107 | ||
3108 | /* | |
3109 | * Now lock the child directory inode and the parent directory | |
3110 | * inode in the proper order. This will take care of validating | |
3111 | * that the directory entry for the child directory inode has | |
3112 | * not changed while we were obtaining a log reservation. | |
3113 | */ | |
3114 | error = xfs_lock_dir_and_entry(dp, dentry, cdp); | |
3115 | if (error) { | |
3116 | xfs_trans_cancel(tp, cancel_flags); | |
3117 | IRELE(cdp); | |
3118 | goto std_return; | |
3119 | } | |
3120 | ||
3121 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
3122 | if (dp != cdp) { | |
3123 | /* | |
3124 | * Only increment the parent directory vnode count if | |
3125 | * we didn't bump it in looking up cdp. The only time | |
3126 | * we don't bump it is when we're looking up ".". | |
3127 | */ | |
3128 | VN_HOLD(dir_vp); | |
3129 | } | |
3130 | ||
3131 | ITRACE(cdp); | |
3132 | xfs_trans_ijoin(tp, cdp, XFS_ILOCK_EXCL); | |
3133 | ||
3134 | ASSERT(cdp->i_d.di_nlink >= 2); | |
3135 | if (cdp->i_d.di_nlink != 2) { | |
3136 | error = XFS_ERROR(ENOTEMPTY); | |
3137 | goto error_return; | |
3138 | } | |
3139 | if (!XFS_DIR_ISEMPTY(mp, cdp)) { | |
3140 | error = XFS_ERROR(ENOTEMPTY); | |
3141 | goto error_return; | |
3142 | } | |
3143 | ||
3144 | error = XFS_DIR_REMOVENAME(mp, tp, dp, name, namelen, cdp->i_ino, | |
3145 | &first_block, &free_list, resblks); | |
3146 | if (error) { | |
3147 | goto error1; | |
3148 | } | |
3149 | ||
3150 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
3151 | ||
3152 | /* | |
3153 | * Bump the in memory generation count on the parent | |
3154 | * directory so that other can know that it has changed. | |
3155 | */ | |
3156 | dp->i_gen++; | |
3157 | ||
3158 | /* | |
3159 | * Drop the link from cdp's "..". | |
3160 | */ | |
3161 | error = xfs_droplink(tp, dp); | |
3162 | if (error) { | |
3163 | goto error1; | |
3164 | } | |
3165 | ||
3166 | /* | |
3167 | * Drop the link from dp to cdp. | |
3168 | */ | |
3169 | error = xfs_droplink(tp, cdp); | |
3170 | if (error) { | |
3171 | goto error1; | |
3172 | } | |
3173 | ||
3174 | /* | |
3175 | * Drop the "." link from cdp to self. | |
3176 | */ | |
3177 | error = xfs_droplink(tp, cdp); | |
3178 | if (error) { | |
3179 | goto error1; | |
3180 | } | |
3181 | ||
3182 | /* Determine these before committing transaction */ | |
3183 | last_cdp_link = (cdp)->i_d.di_nlink==0; | |
3184 | ||
3185 | /* | |
3186 | * Take an extra ref on the child vnode so that it | |
3187 | * does not go to xfs_inactive() from within the commit. | |
3188 | */ | |
3189 | IHOLD(cdp); | |
3190 | ||
3191 | /* | |
3192 | * If this is a synchronous mount, make sure that the | |
3193 | * rmdir transaction goes to disk before returning to | |
3194 | * the user. | |
3195 | */ | |
3196 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
3197 | xfs_trans_set_sync(tp); | |
3198 | } | |
3199 | ||
3200 | error = xfs_bmap_finish (&tp, &free_list, first_block, &committed); | |
3201 | if (error) { | |
3202 | xfs_bmap_cancel(&free_list); | |
3203 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | | |
3204 | XFS_TRANS_ABORT)); | |
3205 | IRELE(cdp); | |
3206 | goto std_return; | |
3207 | } | |
3208 | ||
3209 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
3210 | if (error) { | |
3211 | IRELE(cdp); | |
3212 | goto std_return; | |
3213 | } | |
3214 | ||
3215 | ||
3216 | /* | |
3217 | * Let interposed file systems know about removed links. | |
3218 | */ | |
3219 | VOP_LINK_REMOVED(XFS_ITOV(cdp), dir_vp, last_cdp_link); | |
3220 | ||
3221 | IRELE(cdp); | |
3222 | ||
3223 | /* Fall through to std_return with error = 0 or the errno | |
3224 | * from xfs_trans_commit. */ | |
3225 | std_return: | |
3226 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_POSTREMOVE)) { | |
3227 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, | |
3228 | dir_vp, DM_RIGHT_NULL, | |
3229 | NULL, DM_RIGHT_NULL, | |
3230 | name, NULL, dm_di_mode, | |
3231 | error, 0); | |
3232 | } | |
3233 | return error; | |
3234 | ||
3235 | error1: | |
3236 | xfs_bmap_cancel(&free_list); | |
3237 | cancel_flags |= XFS_TRANS_ABORT; | |
3238 | error_return: | |
3239 | xfs_trans_cancel(tp, cancel_flags); | |
3240 | goto std_return; | |
3241 | } | |
3242 | ||
3243 | ||
3244 | /* | |
3245 | * xfs_readdir | |
3246 | * | |
3247 | * Read dp's entries starting at uiop->uio_offset and translate them into | |
3248 | * bufsize bytes worth of struct dirents starting at bufbase. | |
3249 | */ | |
3250 | STATIC int | |
3251 | xfs_readdir( | |
3252 | bhv_desc_t *dir_bdp, | |
3253 | uio_t *uiop, | |
3254 | cred_t *credp, | |
3255 | int *eofp) | |
3256 | { | |
3257 | xfs_inode_t *dp; | |
3258 | xfs_trans_t *tp = NULL; | |
3259 | int error = 0; | |
3260 | uint lock_mode; | |
3261 | xfs_off_t start_offset; | |
3262 | ||
3263 | vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__, | |
3264 | (inst_t *)__return_address); | |
3265 | dp = XFS_BHVTOI(dir_bdp); | |
3266 | ||
3267 | if (XFS_FORCED_SHUTDOWN(dp->i_mount)) { | |
3268 | return XFS_ERROR(EIO); | |
3269 | } | |
3270 | ||
3271 | lock_mode = xfs_ilock_map_shared(dp); | |
3272 | start_offset = uiop->uio_offset; | |
3273 | error = XFS_DIR_GETDENTS(dp->i_mount, tp, dp, uiop, eofp); | |
3274 | if (start_offset != uiop->uio_offset) { | |
3275 | xfs_ichgtime(dp, XFS_ICHGTIME_ACC); | |
3276 | } | |
3277 | xfs_iunlock_map_shared(dp, lock_mode); | |
3278 | return error; | |
3279 | } | |
3280 | ||
3281 | ||
3282 | /* | |
3283 | * xfs_symlink | |
3284 | * | |
3285 | */ | |
3286 | STATIC int | |
3287 | xfs_symlink( | |
3288 | bhv_desc_t *dir_bdp, | |
3289 | vname_t *dentry, | |
3290 | vattr_t *vap, | |
3291 | char *target_path, | |
3292 | vnode_t **vpp, | |
3293 | cred_t *credp) | |
3294 | { | |
3295 | xfs_trans_t *tp; | |
3296 | xfs_mount_t *mp; | |
3297 | xfs_inode_t *dp; | |
3298 | xfs_inode_t *ip; | |
3299 | int error; | |
3300 | int pathlen; | |
3301 | xfs_bmap_free_t free_list; | |
3302 | xfs_fsblock_t first_block; | |
3303 | boolean_t dp_joined_to_trans; | |
3304 | vnode_t *dir_vp; | |
3305 | uint cancel_flags; | |
3306 | int committed; | |
3307 | xfs_fileoff_t first_fsb; | |
3308 | xfs_filblks_t fs_blocks; | |
3309 | int nmaps; | |
3310 | xfs_bmbt_irec_t mval[SYMLINK_MAPS]; | |
3311 | xfs_daddr_t d; | |
3312 | char *cur_chunk; | |
3313 | int byte_cnt; | |
3314 | int n; | |
3315 | xfs_buf_t *bp; | |
3316 | xfs_prid_t prid; | |
3317 | struct xfs_dquot *udqp, *gdqp; | |
3318 | uint resblks; | |
3319 | char *link_name = VNAME(dentry); | |
3320 | int link_namelen; | |
3321 | ||
3322 | *vpp = NULL; | |
3323 | dir_vp = BHV_TO_VNODE(dir_bdp); | |
3324 | dp = XFS_BHVTOI(dir_bdp); | |
3325 | dp_joined_to_trans = B_FALSE; | |
3326 | error = 0; | |
3327 | ip = NULL; | |
3328 | tp = NULL; | |
3329 | ||
3330 | vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); | |
3331 | ||
3332 | mp = dp->i_mount; | |
3333 | ||
3334 | if (XFS_FORCED_SHUTDOWN(mp)) | |
3335 | return XFS_ERROR(EIO); | |
3336 | ||
3337 | link_namelen = VNAMELEN(dentry); | |
3338 | ||
3339 | /* | |
3340 | * Check component lengths of the target path name. | |
3341 | */ | |
3342 | pathlen = strlen(target_path); | |
3343 | if (pathlen >= MAXPATHLEN) /* total string too long */ | |
3344 | return XFS_ERROR(ENAMETOOLONG); | |
3345 | if (pathlen >= MAXNAMELEN) { /* is any component too long? */ | |
3346 | int len, total; | |
3347 | char *path; | |
3348 | ||
3349 | for(total = 0, path = target_path; total < pathlen;) { | |
3350 | /* | |
3351 | * Skip any slashes. | |
3352 | */ | |
3353 | while(*path == '/') { | |
3354 | total++; | |
3355 | path++; | |
3356 | } | |
3357 | ||
3358 | /* | |
3359 | * Count up to the next slash or end of path. | |
3360 | * Error out if the component is bigger than MAXNAMELEN. | |
3361 | */ | |
3362 | for(len = 0; *path != '/' && total < pathlen;total++, path++) { | |
3363 | if (++len >= MAXNAMELEN) { | |
3364 | error = ENAMETOOLONG; | |
3365 | return error; | |
3366 | } | |
3367 | } | |
3368 | } | |
3369 | } | |
3370 | ||
3371 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_SYMLINK)) { | |
3372 | error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dir_vp, | |
3373 | DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, | |
3374 | link_name, target_path, 0, 0, 0); | |
3375 | if (error) | |
3376 | return error; | |
3377 | } | |
3378 | ||
3379 | /* Return through std_return after this point. */ | |
3380 | ||
3381 | udqp = gdqp = NULL; | |
3382 | if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) | |
3383 | prid = dp->i_d.di_projid; | |
3384 | else if (vap->va_mask & XFS_AT_PROJID) | |
3385 | prid = (xfs_prid_t)vap->va_projid; | |
3386 | else | |
3387 | prid = (xfs_prid_t)dfltprid; | |
3388 | ||
3389 | /* | |
3390 | * Make sure that we have allocated dquot(s) on disk. | |
3391 | */ | |
3392 | error = XFS_QM_DQVOPALLOC(mp, dp, | |
3393 | current_fsuid(credp), current_fsgid(credp), prid, | |
3394 | XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); | |
3395 | if (error) | |
3396 | goto std_return; | |
3397 | ||
3398 | tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); | |
3399 | cancel_flags = XFS_TRANS_RELEASE_LOG_RES; | |
3400 | /* | |
3401 | * The symlink will fit into the inode data fork? | |
3402 | * There can't be any attributes so we get the whole variable part. | |
3403 | */ | |
3404 | if (pathlen <= XFS_LITINO(mp)) | |
3405 | fs_blocks = 0; | |
3406 | else | |
3407 | fs_blocks = XFS_B_TO_FSB(mp, pathlen); | |
3408 | resblks = XFS_SYMLINK_SPACE_RES(mp, link_namelen, fs_blocks); | |
3409 | error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, | |
3410 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
3411 | if (error == ENOSPC && fs_blocks == 0) { | |
3412 | resblks = 0; | |
3413 | error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, | |
3414 | XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); | |
3415 | } | |
3416 | if (error) { | |
3417 | cancel_flags = 0; | |
3418 | dp = NULL; | |
3419 | goto error_return; | |
3420 | } | |
3421 | ||
3422 | xfs_ilock(dp, XFS_ILOCK_EXCL); | |
3423 | ||
3424 | /* | |
3425 | * Check whether the directory allows new symlinks or not. | |
3426 | */ | |
3427 | if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { | |
3428 | error = XFS_ERROR(EPERM); | |
3429 | goto error_return; | |
3430 | } | |
3431 | ||
3432 | /* | |
3433 | * Reserve disk quota : blocks and inode. | |
3434 | */ | |
3435 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); | |
3436 | if (error) | |
3437 | goto error_return; | |
3438 | ||
3439 | /* | |
3440 | * Check for ability to enter directory entry, if no space reserved. | |
3441 | */ | |
3442 | if (resblks == 0 && | |
3443 | (error = XFS_DIR_CANENTER(mp, tp, dp, link_name, link_namelen))) | |
3444 | goto error_return; | |
3445 | /* | |
3446 | * Initialize the bmap freelist prior to calling either | |
3447 | * bmapi or the directory create code. | |
3448 | */ | |
3449 | XFS_BMAP_INIT(&free_list, &first_block); | |
3450 | ||
3451 | /* | |
3452 | * Allocate an inode for the symlink. | |
3453 | */ | |
3454 | error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (vap->va_mode&~S_IFMT), | |
3455 | 1, 0, credp, prid, resblks > 0, &ip, NULL); | |
3456 | if (error) { | |
3457 | if (error == ENOSPC) | |
3458 | goto error_return; | |
3459 | goto error1; | |
3460 | } | |
3461 | ITRACE(ip); | |
3462 | ||
3463 | VN_HOLD(dir_vp); | |
3464 | xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); | |
3465 | dp_joined_to_trans = B_TRUE; | |
3466 | ||
3467 | /* | |
3468 | * Also attach the dquot(s) to it, if applicable. | |
3469 | */ | |
3470 | XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp); | |
3471 | ||
3472 | if (resblks) | |
3473 | resblks -= XFS_IALLOC_SPACE_RES(mp); | |
3474 | /* | |
3475 | * If the symlink will fit into the inode, write it inline. | |
3476 | */ | |
3477 | if (pathlen <= XFS_IFORK_DSIZE(ip)) { | |
3478 | xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); | |
3479 | memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); | |
3480 | ip->i_d.di_size = pathlen; | |
3481 | ||
3482 | /* | |
3483 | * The inode was initially created in extent format. | |
3484 | */ | |
3485 | ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); | |
3486 | ip->i_df.if_flags |= XFS_IFINLINE; | |
3487 | ||
3488 | ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
3489 | xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); | |
3490 | ||
3491 | } else { | |
3492 | first_fsb = 0; | |
3493 | nmaps = SYMLINK_MAPS; | |
3494 | ||
3495 | error = xfs_bmapi(tp, ip, first_fsb, fs_blocks, | |
3496 | XFS_BMAPI_WRITE | XFS_BMAPI_METADATA, | |
3497 | &first_block, resblks, mval, &nmaps, | |
3498 | &free_list); | |
3499 | if (error) { | |
3500 | goto error1; | |
3501 | } | |
3502 | ||
3503 | if (resblks) | |
3504 | resblks -= fs_blocks; | |
3505 | ip->i_d.di_size = pathlen; | |
3506 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
3507 | ||
3508 | cur_chunk = target_path; | |
3509 | for (n = 0; n < nmaps; n++) { | |
3510 | d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); | |
3511 | byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); | |
3512 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, | |
3513 | BTOBB(byte_cnt), 0); | |
3514 | ASSERT(bp && !XFS_BUF_GETERROR(bp)); | |
3515 | if (pathlen < byte_cnt) { | |
3516 | byte_cnt = pathlen; | |
3517 | } | |
3518 | pathlen -= byte_cnt; | |
3519 | ||
3520 | memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt); | |
3521 | cur_chunk += byte_cnt; | |
3522 | ||
3523 | xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1); | |
3524 | } | |
3525 | } | |
3526 | ||
3527 | /* | |
3528 | * Create the directory entry for the symlink. | |
3529 | */ | |
3530 | error = XFS_DIR_CREATENAME(mp, tp, dp, link_name, link_namelen, | |
3531 | ip->i_ino, &first_block, &free_list, resblks); | |
3532 | if (error) { | |
3533 | goto error1; | |
3534 | } | |
3535 | xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
3536 | xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); | |
3537 | ||
3538 | /* | |
3539 | * Bump the in memory version number of the parent directory | |
3540 | * so that other processes accessing it will recognize that | |
3541 | * the directory has changed. | |
3542 | */ | |
3543 | dp->i_gen++; | |
3544 | ||
3545 | /* | |
3546 | * If this is a synchronous mount, make sure that the | |
3547 | * symlink transaction goes to disk before returning to | |
3548 | * the user. | |
3549 | */ | |
3550 | if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { | |
3551 | xfs_trans_set_sync(tp); | |
3552 | } | |
3553 | ||
3554 | /* | |
3555 | * xfs_trans_commit normally decrements the vnode ref count | |
3556 | * when it unlocks the inode. Since we want to return the | |
3557 | * vnode to the caller, we bump the vnode ref count now. | |
3558 | */ | |
3559 | IHOLD(ip); | |
3560 | ||
3561 | error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); | |
3562 | if (error) { | |
3563 | goto error2; | |
3564 | } | |
3565 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
3566 | XFS_QM_DQRELE(mp, udqp); | |
3567 | XFS_QM_DQRELE(mp, gdqp); | |
3568 | ||
3569 | /* Fall through to std_return with error = 0 or errno from | |
3570 | * xfs_trans_commit */ | |
3571 | std_return: | |
3572 | if (DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), | |
3573 | DM_EVENT_POSTSYMLINK)) { | |
3574 | (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK, | |
3575 | dir_vp, DM_RIGHT_NULL, | |
3576 | error ? NULL : XFS_ITOV(ip), | |
3577 | DM_RIGHT_NULL, link_name, target_path, | |
3578 | 0, error, 0); | |
3579 | } | |
3580 | ||
3581 | if (!error) { | |
3582 | vnode_t *vp; | |
3583 | ||
3584 | ASSERT(ip); | |
3585 | vp = XFS_ITOV(ip); | |
3586 | *vpp = vp; | |
3587 | } | |
3588 | return error; | |
3589 | ||
3590 | error2: | |
3591 | IRELE(ip); | |
3592 | error1: | |
3593 | xfs_bmap_cancel(&free_list); | |
3594 | cancel_flags |= XFS_TRANS_ABORT; | |
3595 | error_return: | |
3596 | xfs_trans_cancel(tp, cancel_flags); | |
3597 | XFS_QM_DQRELE(mp, udqp); | |
3598 | XFS_QM_DQRELE(mp, gdqp); | |
3599 | ||
3600 | if (!dp_joined_to_trans && (dp != NULL)) { | |
3601 | xfs_iunlock(dp, XFS_ILOCK_EXCL); | |
3602 | } | |
3603 | ||
3604 | goto std_return; | |
3605 | } | |
3606 | ||
3607 | ||
3608 | /* | |
3609 | * xfs_fid2 | |
3610 | * | |
3611 | * A fid routine that takes a pointer to a previously allocated | |
3612 | * fid structure (like xfs_fast_fid) but uses a 64 bit inode number. | |
3613 | */ | |
3614 | STATIC int | |
3615 | xfs_fid2( | |
3616 | bhv_desc_t *bdp, | |
3617 | fid_t *fidp) | |
3618 | { | |
3619 | xfs_inode_t *ip; | |
3620 | xfs_fid2_t *xfid; | |
3621 | ||
3622 | vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, | |
3623 | (inst_t *)__return_address); | |
3624 | ASSERT(sizeof(fid_t) >= sizeof(xfs_fid2_t)); | |
3625 | ||
3626 | xfid = (xfs_fid2_t *)fidp; | |
3627 | ip = XFS_BHVTOI(bdp); | |
3628 | xfid->fid_len = sizeof(xfs_fid2_t) - sizeof(xfid->fid_len); | |
3629 | xfid->fid_pad = 0; | |
3630 | /* | |
3631 | * use memcpy because the inode is a long long and there's no | |
3632 | * assurance that xfid->fid_ino is properly aligned. | |
3633 | */ | |
3634 | memcpy(&xfid->fid_ino, &ip->i_ino, sizeof(xfid->fid_ino)); | |
3635 | xfid->fid_gen = ip->i_d.di_gen; | |
3636 | ||
3637 | return 0; | |
3638 | } | |
3639 | ||
3640 | ||
3641 | /* | |
3642 | * xfs_rwlock | |
3643 | */ | |
3644 | int | |
3645 | xfs_rwlock( | |
3646 | bhv_desc_t *bdp, | |
3647 | vrwlock_t locktype) | |
3648 | { | |
3649 | xfs_inode_t *ip; | |
3650 | vnode_t *vp; | |
3651 | ||
3652 | vp = BHV_TO_VNODE(bdp); | |
3653 | if (vp->v_type == VDIR) | |
3654 | return 1; | |
3655 | ip = XFS_BHVTOI(bdp); | |
3656 | if (locktype == VRWLOCK_WRITE) { | |
3657 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
3658 | } else if (locktype == VRWLOCK_TRY_READ) { | |
3659 | return (xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)); | |
3660 | } else if (locktype == VRWLOCK_TRY_WRITE) { | |
3661 | return (xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)); | |
3662 | } else { | |
3663 | ASSERT((locktype == VRWLOCK_READ) || | |
3664 | (locktype == VRWLOCK_WRITE_DIRECT)); | |
3665 | xfs_ilock(ip, XFS_IOLOCK_SHARED); | |
3666 | } | |
3667 | ||
3668 | return 1; | |
3669 | } | |
3670 | ||
3671 | ||
3672 | /* | |
3673 | * xfs_rwunlock | |
3674 | */ | |
3675 | void | |
3676 | xfs_rwunlock( | |
3677 | bhv_desc_t *bdp, | |
3678 | vrwlock_t locktype) | |
3679 | { | |
3680 | xfs_inode_t *ip; | |
3681 | vnode_t *vp; | |
3682 | ||
3683 | vp = BHV_TO_VNODE(bdp); | |
3684 | if (vp->v_type == VDIR) | |
3685 | return; | |
3686 | ip = XFS_BHVTOI(bdp); | |
3687 | if (locktype == VRWLOCK_WRITE) { | |
3688 | /* | |
3689 | * In the write case, we may have added a new entry to | |
3690 | * the reference cache. This might store a pointer to | |
3691 | * an inode to be released in this inode. If it is there, | |
3692 | * clear the pointer and release the inode after unlocking | |
3693 | * this one. | |
3694 | */ | |
3695 | xfs_refcache_iunlock(ip, XFS_IOLOCK_EXCL); | |
3696 | } else { | |
3697 | ASSERT((locktype == VRWLOCK_READ) || | |
3698 | (locktype == VRWLOCK_WRITE_DIRECT)); | |
3699 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); | |
3700 | } | |
3701 | return; | |
3702 | } | |
3703 | ||
3704 | STATIC int | |
3705 | xfs_inode_flush( | |
3706 | bhv_desc_t *bdp, | |
3707 | int flags) | |
3708 | { | |
3709 | xfs_inode_t *ip; | |
3710 | xfs_mount_t *mp; | |
3711 | xfs_inode_log_item_t *iip; | |
3712 | int error = 0; | |
3713 | ||
3714 | ip = XFS_BHVTOI(bdp); | |
3715 | mp = ip->i_mount; | |
3716 | iip = ip->i_itemp; | |
3717 | ||
3718 | if (XFS_FORCED_SHUTDOWN(mp)) | |
3719 | return XFS_ERROR(EIO); | |
3720 | ||
3721 | /* | |
3722 | * Bypass inodes which have already been cleaned by | |
3723 | * the inode flush clustering code inside xfs_iflush | |
3724 | */ | |
3725 | if ((ip->i_update_core == 0) && | |
3726 | ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL))) | |
3727 | return 0; | |
3728 | ||
3729 | if (flags & FLUSH_LOG) { | |
3730 | if (iip && iip->ili_last_lsn) { | |
3731 | xlog_t *log = mp->m_log; | |
3732 | xfs_lsn_t sync_lsn; | |
3733 | int s, log_flags = XFS_LOG_FORCE; | |
3734 | ||
3735 | s = GRANT_LOCK(log); | |
3736 | sync_lsn = log->l_last_sync_lsn; | |
3737 | GRANT_UNLOCK(log, s); | |
3738 | ||
3739 | if ((XFS_LSN_CMP(iip->ili_last_lsn, sync_lsn) <= 0)) | |
3740 | return 0; | |
3741 | ||
3742 | if (flags & FLUSH_SYNC) | |
3743 | log_flags |= XFS_LOG_SYNC; | |
3744 | return xfs_log_force(mp, iip->ili_last_lsn, log_flags); | |
3745 | } | |
3746 | } | |
3747 | ||
3748 | /* | |
3749 | * We make this non-blocking if the inode is contended, | |
3750 | * return EAGAIN to indicate to the caller that they | |
3751 | * did not succeed. This prevents the flush path from | |
3752 | * blocking on inodes inside another operation right | |
3753 | * now, they get caught later by xfs_sync. | |
3754 | */ | |
3755 | if (flags & FLUSH_INODE) { | |
3756 | int flush_flags; | |
3757 | ||
3758 | if (xfs_ipincount(ip)) | |
3759 | return EAGAIN; | |
3760 | ||
3761 | if (flags & FLUSH_SYNC) { | |
3762 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
3763 | xfs_iflock(ip); | |
3764 | } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { | |
3765 | if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) { | |
3766 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
3767 | return EAGAIN; | |
3768 | } | |
3769 | } else { | |
3770 | return EAGAIN; | |
3771 | } | |
3772 | ||
3773 | if (flags & FLUSH_SYNC) | |
3774 | flush_flags = XFS_IFLUSH_SYNC; | |
3775 | else | |
3776 | flush_flags = XFS_IFLUSH_ASYNC; | |
3777 | ||
3778 | error = xfs_iflush(ip, flush_flags); | |
3779 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
3780 | } | |
3781 | ||
3782 | return error; | |
3783 | } | |
3784 | ||
3785 | ||
3786 | int | |
3787 | xfs_set_dmattrs ( | |
3788 | bhv_desc_t *bdp, | |
3789 | u_int evmask, | |
3790 | u_int16_t state, | |
3791 | cred_t *credp) | |
3792 | { | |
3793 | xfs_inode_t *ip; | |
3794 | xfs_trans_t *tp; | |
3795 | xfs_mount_t *mp; | |
3796 | int error; | |
3797 | ||
3798 | if (!capable(CAP_SYS_ADMIN)) | |
3799 | return XFS_ERROR(EPERM); | |
3800 | ||
3801 | ip = XFS_BHVTOI(bdp); | |
3802 | mp = ip->i_mount; | |
3803 | ||
3804 | if (XFS_FORCED_SHUTDOWN(mp)) | |
3805 | return XFS_ERROR(EIO); | |
3806 | ||
3807 | tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS); | |
3808 | error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0); | |
3809 | if (error) { | |
3810 | xfs_trans_cancel(tp, 0); | |
3811 | return error; | |
3812 | } | |
3813 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
3814 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
3815 | ||
3816 | ip->i_iocore.io_dmevmask = ip->i_d.di_dmevmask = evmask; | |
3817 | ip->i_iocore.io_dmstate = ip->i_d.di_dmstate = state; | |
3818 | ||
3819 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
3820 | IHOLD(ip); | |
3821 | error = xfs_trans_commit(tp, 0, NULL); | |
3822 | ||
3823 | return error; | |
3824 | } | |
3825 | ||
3826 | ||
3827 | /* | |
3828 | * xfs_reclaim | |
3829 | */ | |
3830 | STATIC int | |
3831 | xfs_reclaim( | |
3832 | bhv_desc_t *bdp) | |
3833 | { | |
3834 | xfs_inode_t *ip; | |
3835 | vnode_t *vp; | |
3836 | ||
3837 | vp = BHV_TO_VNODE(bdp); | |
3838 | ip = XFS_BHVTOI(bdp); | |
3839 | ||
3840 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
3841 | ||
3842 | ASSERT(!VN_MAPPED(vp)); | |
3843 | ||
3844 | /* bad inode, get out here ASAP */ | |
3845 | if (VN_BAD(vp)) { | |
3846 | xfs_ireclaim(ip); | |
3847 | return 0; | |
3848 | } | |
3849 | ||
3850 | if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) { | |
3851 | if (ip->i_d.di_size > 0) { | |
3852 | /* | |
3853 | * Flush and invalidate any data left around that is | |
3854 | * a part of this file. | |
3855 | * | |
3856 | * Get the inode's i/o lock so that buffers are pushed | |
3857 | * out while holding the proper lock. We can't hold | |
3858 | * the inode lock here since flushing out buffers may | |
3859 | * cause us to try to get the lock in xfs_strategy(). | |
3860 | * | |
3861 | * We don't have to call remapf() here, because there | |
3862 | * cannot be any mapped file references to this vnode | |
3863 | * since it is being reclaimed. | |
3864 | */ | |
3865 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
3866 | ||
3867 | /* | |
3868 | * If we hit an IO error, we need to make sure that the | |
3869 | * buffer and page caches of file data for | |
3870 | * the file are tossed away. We don't want to use | |
3871 | * VOP_FLUSHINVAL_PAGES here because we don't want dirty | |
3872 | * pages to stay attached to the vnode, but be | |
3873 | * marked P_BAD. pdflush/vnode_pagebad | |
3874 | * hates that. | |
3875 | */ | |
3876 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
3877 | VOP_FLUSHINVAL_PAGES(vp, 0, -1, FI_NONE); | |
3878 | } else { | |
3879 | VOP_TOSS_PAGES(vp, 0, -1, FI_NONE); | |
3880 | } | |
3881 | ||
3882 | ASSERT(VN_CACHED(vp) == 0); | |
3883 | ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || | |
3884 | ip->i_delayed_blks == 0); | |
3885 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
3886 | } else if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
3887 | /* | |
3888 | * di_size field may not be quite accurate if we're | |
3889 | * shutting down. | |
3890 | */ | |
3891 | VOP_TOSS_PAGES(vp, 0, -1, FI_NONE); | |
3892 | ASSERT(VN_CACHED(vp) == 0); | |
3893 | } | |
3894 | } | |
3895 | ||
3896 | /* If we have nothing to flush with this inode then complete the | |
3897 | * teardown now, otherwise break the link between the xfs inode | |
3898 | * and the linux inode and clean up the xfs inode later. This | |
3899 | * avoids flushing the inode to disk during the delete operation | |
3900 | * itself. | |
3901 | */ | |
3902 | if (!ip->i_update_core && (ip->i_itemp == NULL)) { | |
3903 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
3904 | xfs_iflock(ip); | |
3905 | return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC); | |
3906 | } else { | |
3907 | xfs_mount_t *mp = ip->i_mount; | |
3908 | ||
3909 | /* Protect sync from us */ | |
3910 | XFS_MOUNT_ILOCK(mp); | |
3911 | vn_bhv_remove(VN_BHV_HEAD(vp), XFS_ITOBHV(ip)); | |
3912 | list_add_tail(&ip->i_reclaim, &mp->m_del_inodes); | |
3913 | ip->i_flags |= XFS_IRECLAIMABLE; | |
3914 | XFS_MOUNT_IUNLOCK(mp); | |
3915 | } | |
3916 | return 0; | |
3917 | } | |
3918 | ||
3919 | int | |
3920 | xfs_finish_reclaim( | |
3921 | xfs_inode_t *ip, | |
3922 | int locked, | |
3923 | int sync_mode) | |
3924 | { | |
3925 | xfs_ihash_t *ih = ip->i_hash; | |
3926 | vnode_t *vp = XFS_ITOV_NULL(ip); | |
3927 | int error; | |
3928 | ||
3929 | if (vp && VN_BAD(vp)) | |
3930 | goto reclaim; | |
3931 | ||
3932 | /* The hash lock here protects a thread in xfs_iget_core from | |
3933 | * racing with us on linking the inode back with a vnode. | |
3934 | * Once we have the XFS_IRECLAIM flag set it will not touch | |
3935 | * us. | |
3936 | */ | |
3937 | write_lock(&ih->ih_lock); | |
3938 | if ((ip->i_flags & XFS_IRECLAIM) || | |
3939 | (!(ip->i_flags & XFS_IRECLAIMABLE) && vp == NULL)) { | |
3940 | write_unlock(&ih->ih_lock); | |
3941 | if (locked) { | |
3942 | xfs_ifunlock(ip); | |
3943 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3944 | } | |
3945 | return(1); | |
3946 | } | |
3947 | ip->i_flags |= XFS_IRECLAIM; | |
3948 | write_unlock(&ih->ih_lock); | |
3949 | ||
3950 | /* | |
3951 | * If the inode is still dirty, then flush it out. If the inode | |
3952 | * is not in the AIL, then it will be OK to flush it delwri as | |
3953 | * long as xfs_iflush() does not keep any references to the inode. | |
3954 | * We leave that decision up to xfs_iflush() since it has the | |
3955 | * knowledge of whether it's OK to simply do a delwri flush of | |
3956 | * the inode or whether we need to wait until the inode is | |
3957 | * pulled from the AIL. | |
3958 | * We get the flush lock regardless, though, just to make sure | |
3959 | * we don't free it while it is being flushed. | |
3960 | */ | |
3961 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { | |
3962 | if (!locked) { | |
3963 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
3964 | xfs_iflock(ip); | |
3965 | } | |
3966 | ||
3967 | if (ip->i_update_core || | |
3968 | ((ip->i_itemp != NULL) && | |
3969 | (ip->i_itemp->ili_format.ilf_fields != 0))) { | |
3970 | error = xfs_iflush(ip, sync_mode); | |
3971 | /* | |
3972 | * If we hit an error, typically because of filesystem | |
3973 | * shutdown, we don't need to let vn_reclaim to know | |
3974 | * because we're gonna reclaim the inode anyway. | |
3975 | */ | |
3976 | if (error) { | |
3977 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3978 | goto reclaim; | |
3979 | } | |
3980 | xfs_iflock(ip); /* synchronize with xfs_iflush_done */ | |
3981 | } | |
3982 | ||
3983 | ASSERT(ip->i_update_core == 0); | |
3984 | ASSERT(ip->i_itemp == NULL || | |
3985 | ip->i_itemp->ili_format.ilf_fields == 0); | |
3986 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3987 | } else if (locked) { | |
3988 | /* | |
3989 | * We are not interested in doing an iflush if we're | |
3990 | * in the process of shutting down the filesystem forcibly. | |
3991 | * So, just reclaim the inode. | |
3992 | */ | |
3993 | xfs_ifunlock(ip); | |
3994 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
3995 | } | |
3996 | ||
3997 | reclaim: | |
3998 | xfs_ireclaim(ip); | |
3999 | return 0; | |
4000 | } | |
4001 | ||
4002 | int | |
4003 | xfs_finish_reclaim_all(xfs_mount_t *mp, int noblock) | |
4004 | { | |
4005 | int purged; | |
4006 | xfs_inode_t *ip, *n; | |
4007 | int done = 0; | |
4008 | ||
4009 | while (!done) { | |
4010 | purged = 0; | |
4011 | XFS_MOUNT_ILOCK(mp); | |
4012 | list_for_each_entry_safe(ip, n, &mp->m_del_inodes, i_reclaim) { | |
4013 | if (noblock) { | |
4014 | if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) | |
4015 | continue; | |
4016 | if (xfs_ipincount(ip) || | |
4017 | !xfs_iflock_nowait(ip)) { | |
4018 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4019 | continue; | |
4020 | } | |
4021 | } | |
4022 | XFS_MOUNT_IUNLOCK(mp); | |
4023 | xfs_finish_reclaim(ip, noblock, | |
4024 | XFS_IFLUSH_DELWRI_ELSE_ASYNC); | |
4025 | purged = 1; | |
4026 | break; | |
4027 | } | |
4028 | ||
4029 | done = !purged; | |
4030 | } | |
4031 | ||
4032 | XFS_MOUNT_IUNLOCK(mp); | |
4033 | return 0; | |
4034 | } | |
4035 | ||
4036 | /* | |
4037 | * xfs_alloc_file_space() | |
4038 | * This routine allocates disk space for the given file. | |
4039 | * | |
4040 | * If alloc_type == 0, this request is for an ALLOCSP type | |
4041 | * request which will change the file size. In this case, no | |
4042 | * DMAPI event will be generated by the call. A TRUNCATE event | |
4043 | * will be generated later by xfs_setattr. | |
4044 | * | |
4045 | * If alloc_type != 0, this request is for a RESVSP type | |
4046 | * request, and a DMAPI DM_EVENT_WRITE will be generated if the | |
4047 | * lower block boundary byte address is less than the file's | |
4048 | * length. | |
4049 | * | |
4050 | * RETURNS: | |
4051 | * 0 on success | |
4052 | * errno on error | |
4053 | * | |
4054 | */ | |
4055 | STATIC int | |
4056 | xfs_alloc_file_space( | |
4057 | xfs_inode_t *ip, | |
4058 | xfs_off_t offset, | |
4059 | xfs_off_t len, | |
4060 | int alloc_type, | |
4061 | int attr_flags) | |
4062 | { | |
4063 | xfs_filblks_t allocated_fsb; | |
4064 | xfs_filblks_t allocatesize_fsb; | |
4065 | int committed; | |
4066 | xfs_off_t count; | |
4067 | xfs_filblks_t datablocks; | |
4068 | int error; | |
4069 | xfs_fsblock_t firstfsb; | |
4070 | xfs_bmap_free_t free_list; | |
4071 | xfs_bmbt_irec_t *imapp; | |
4072 | xfs_bmbt_irec_t imaps[1]; | |
4073 | xfs_mount_t *mp; | |
4074 | int numrtextents; | |
4075 | int reccount; | |
4076 | uint resblks; | |
4077 | int rt; | |
4078 | int rtextsize; | |
4079 | xfs_fileoff_t startoffset_fsb; | |
4080 | xfs_trans_t *tp; | |
4081 | int xfs_bmapi_flags; | |
4082 | ||
4083 | vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); | |
4084 | mp = ip->i_mount; | |
4085 | ||
4086 | if (XFS_FORCED_SHUTDOWN(mp)) | |
4087 | return XFS_ERROR(EIO); | |
4088 | ||
4089 | /* | |
4090 | * determine if this is a realtime file | |
4091 | */ | |
4092 | if ((rt = XFS_IS_REALTIME_INODE(ip)) != 0) { | |
4093 | if (ip->i_d.di_extsize) | |
4094 | rtextsize = ip->i_d.di_extsize; | |
4095 | else | |
4096 | rtextsize = mp->m_sb.sb_rextsize; | |
4097 | } else | |
4098 | rtextsize = 0; | |
4099 | ||
4100 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
4101 | return error; | |
4102 | ||
4103 | if (len <= 0) | |
4104 | return XFS_ERROR(EINVAL); | |
4105 | ||
4106 | count = len; | |
4107 | error = 0; | |
4108 | imapp = &imaps[0]; | |
4109 | reccount = 1; | |
4110 | xfs_bmapi_flags = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0); | |
4111 | startoffset_fsb = XFS_B_TO_FSBT(mp, offset); | |
4112 | allocatesize_fsb = XFS_B_TO_FSB(mp, count); | |
4113 | ||
4114 | /* Generate a DMAPI event if needed. */ | |
4115 | if (alloc_type != 0 && offset < ip->i_d.di_size && | |
4116 | (attr_flags&ATTR_DMI) == 0 && | |
4117 | DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) { | |
4118 | xfs_off_t end_dmi_offset; | |
4119 | ||
4120 | end_dmi_offset = offset+len; | |
4121 | if (end_dmi_offset > ip->i_d.di_size) | |
4122 | end_dmi_offset = ip->i_d.di_size; | |
4123 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, XFS_ITOV(ip), | |
4124 | offset, end_dmi_offset - offset, | |
4125 | 0, NULL); | |
4126 | if (error) | |
4127 | return(error); | |
4128 | } | |
4129 | ||
4130 | /* | |
4131 | * allocate file space until done or until there is an error | |
4132 | */ | |
4133 | retry: | |
4134 | while (allocatesize_fsb && !error) { | |
4135 | /* | |
4136 | * determine if reserving space on | |
4137 | * the data or realtime partition. | |
4138 | */ | |
4139 | if (rt) { | |
4140 | xfs_fileoff_t s, e; | |
4141 | ||
4142 | s = startoffset_fsb; | |
4143 | do_div(s, rtextsize); | |
4144 | s *= rtextsize; | |
4145 | e = roundup_64(startoffset_fsb + allocatesize_fsb, | |
4146 | rtextsize); | |
4147 | numrtextents = (int)(e - s) / mp->m_sb.sb_rextsize; | |
4148 | datablocks = 0; | |
4149 | } else { | |
4150 | datablocks = allocatesize_fsb; | |
4151 | numrtextents = 0; | |
4152 | } | |
4153 | ||
4154 | /* | |
4155 | * allocate and setup the transaction | |
4156 | */ | |
4157 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
4158 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks); | |
4159 | error = xfs_trans_reserve(tp, | |
4160 | resblks, | |
4161 | XFS_WRITE_LOG_RES(mp), | |
4162 | numrtextents, | |
4163 | XFS_TRANS_PERM_LOG_RES, | |
4164 | XFS_WRITE_LOG_COUNT); | |
4165 | ||
4166 | /* | |
4167 | * check for running out of space | |
4168 | */ | |
4169 | if (error) { | |
4170 | /* | |
4171 | * Free the transaction structure. | |
4172 | */ | |
4173 | ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
4174 | xfs_trans_cancel(tp, 0); | |
4175 | break; | |
4176 | } | |
4177 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
4178 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, | |
4179 | ip->i_udquot, ip->i_gdquot, resblks, 0, 0); | |
4180 | if (error) | |
4181 | goto error1; | |
4182 | ||
4183 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
4184 | xfs_trans_ihold(tp, ip); | |
4185 | ||
4186 | /* | |
4187 | * issue the bmapi() call to allocate the blocks | |
4188 | */ | |
4189 | XFS_BMAP_INIT(&free_list, &firstfsb); | |
4190 | error = xfs_bmapi(tp, ip, startoffset_fsb, | |
4191 | allocatesize_fsb, xfs_bmapi_flags, | |
4192 | &firstfsb, 0, imapp, &reccount, | |
4193 | &free_list); | |
4194 | if (error) { | |
4195 | goto error0; | |
4196 | } | |
4197 | ||
4198 | /* | |
4199 | * complete the transaction | |
4200 | */ | |
4201 | error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); | |
4202 | if (error) { | |
4203 | goto error0; | |
4204 | } | |
4205 | ||
4206 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
4207 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4208 | if (error) { | |
4209 | break; | |
4210 | } | |
4211 | ||
4212 | allocated_fsb = imapp->br_blockcount; | |
4213 | ||
4214 | if (reccount == 0) { | |
4215 | error = XFS_ERROR(ENOSPC); | |
4216 | break; | |
4217 | } | |
4218 | ||
4219 | startoffset_fsb += allocated_fsb; | |
4220 | allocatesize_fsb -= allocated_fsb; | |
4221 | } | |
4222 | dmapi_enospc_check: | |
4223 | if (error == ENOSPC && (attr_flags&ATTR_DMI) == 0 && | |
4224 | DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_NOSPACE)) { | |
4225 | ||
4226 | error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE, | |
4227 | XFS_ITOV(ip), DM_RIGHT_NULL, | |
4228 | XFS_ITOV(ip), DM_RIGHT_NULL, | |
4229 | NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */ | |
4230 | if (error == 0) | |
4231 | goto retry; /* Maybe DMAPI app. has made space */ | |
4232 | /* else fall through with error from XFS_SEND_DATA */ | |
4233 | } | |
4234 | ||
4235 | return error; | |
4236 | ||
4237 | error0: | |
4238 | xfs_bmap_cancel(&free_list); | |
4239 | error1: | |
4240 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
4241 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4242 | goto dmapi_enospc_check; | |
4243 | } | |
4244 | ||
4245 | /* | |
4246 | * Zero file bytes between startoff and endoff inclusive. | |
4247 | * The iolock is held exclusive and no blocks are buffered. | |
4248 | */ | |
4249 | STATIC int | |
4250 | xfs_zero_remaining_bytes( | |
4251 | xfs_inode_t *ip, | |
4252 | xfs_off_t startoff, | |
4253 | xfs_off_t endoff) | |
4254 | { | |
4255 | xfs_bmbt_irec_t imap; | |
4256 | xfs_fileoff_t offset_fsb; | |
4257 | xfs_off_t lastoffset; | |
4258 | xfs_off_t offset; | |
4259 | xfs_buf_t *bp; | |
4260 | xfs_mount_t *mp = ip->i_mount; | |
4261 | int nimap; | |
4262 | int error = 0; | |
4263 | ||
4264 | bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize, | |
4265 | ip->i_d.di_flags & XFS_DIFLAG_REALTIME ? | |
4266 | mp->m_rtdev_targp : mp->m_ddev_targp); | |
4267 | ||
4268 | for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { | |
4269 | offset_fsb = XFS_B_TO_FSBT(mp, offset); | |
4270 | nimap = 1; | |
4271 | error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0, NULL, 0, &imap, | |
4272 | &nimap, NULL); | |
4273 | if (error || nimap < 1) | |
4274 | break; | |
4275 | ASSERT(imap.br_blockcount >= 1); | |
4276 | ASSERT(imap.br_startoff == offset_fsb); | |
4277 | lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; | |
4278 | if (lastoffset > endoff) | |
4279 | lastoffset = endoff; | |
4280 | if (imap.br_startblock == HOLESTARTBLOCK) | |
4281 | continue; | |
4282 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
4283 | if (imap.br_state == XFS_EXT_UNWRITTEN) | |
4284 | continue; | |
4285 | XFS_BUF_UNDONE(bp); | |
4286 | XFS_BUF_UNWRITE(bp); | |
4287 | XFS_BUF_READ(bp); | |
4288 | XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock)); | |
4289 | xfsbdstrat(mp, bp); | |
4290 | if ((error = xfs_iowait(bp))) { | |
4291 | xfs_ioerror_alert("xfs_zero_remaining_bytes(read)", | |
4292 | mp, bp, XFS_BUF_ADDR(bp)); | |
4293 | break; | |
4294 | } | |
4295 | memset(XFS_BUF_PTR(bp) + | |
4296 | (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), | |
4297 | 0, lastoffset - offset + 1); | |
4298 | XFS_BUF_UNDONE(bp); | |
4299 | XFS_BUF_UNREAD(bp); | |
4300 | XFS_BUF_WRITE(bp); | |
4301 | xfsbdstrat(mp, bp); | |
4302 | if ((error = xfs_iowait(bp))) { | |
4303 | xfs_ioerror_alert("xfs_zero_remaining_bytes(write)", | |
4304 | mp, bp, XFS_BUF_ADDR(bp)); | |
4305 | break; | |
4306 | } | |
4307 | } | |
4308 | xfs_buf_free(bp); | |
4309 | return error; | |
4310 | } | |
4311 | ||
4312 | /* | |
4313 | * xfs_free_file_space() | |
4314 | * This routine frees disk space for the given file. | |
4315 | * | |
4316 | * This routine is only called by xfs_change_file_space | |
4317 | * for an UNRESVSP type call. | |
4318 | * | |
4319 | * RETURNS: | |
4320 | * 0 on success | |
4321 | * errno on error | |
4322 | * | |
4323 | */ | |
4324 | STATIC int | |
4325 | xfs_free_file_space( | |
4326 | xfs_inode_t *ip, | |
4327 | xfs_off_t offset, | |
4328 | xfs_off_t len, | |
4329 | int attr_flags) | |
4330 | { | |
4331 | vnode_t *vp; | |
4332 | int committed; | |
4333 | int done; | |
4334 | xfs_off_t end_dmi_offset; | |
4335 | xfs_fileoff_t endoffset_fsb; | |
4336 | int error; | |
4337 | xfs_fsblock_t firstfsb; | |
4338 | xfs_bmap_free_t free_list; | |
4339 | xfs_off_t ilen; | |
4340 | xfs_bmbt_irec_t imap; | |
4341 | xfs_off_t ioffset; | |
4342 | xfs_extlen_t mod=0; | |
4343 | xfs_mount_t *mp; | |
4344 | int nimap; | |
4345 | uint resblks; | |
4346 | int rounding; | |
4347 | int rt; | |
4348 | xfs_fileoff_t startoffset_fsb; | |
4349 | xfs_trans_t *tp; | |
4350 | int need_iolock = 1; | |
4351 | ||
4352 | vp = XFS_ITOV(ip); | |
4353 | mp = ip->i_mount; | |
4354 | ||
4355 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
4356 | ||
4357 | if ((error = XFS_QM_DQATTACH(mp, ip, 0))) | |
4358 | return error; | |
4359 | ||
4360 | error = 0; | |
4361 | if (len <= 0) /* if nothing being freed */ | |
4362 | return error; | |
4363 | rt = (ip->i_d.di_flags & XFS_DIFLAG_REALTIME); | |
4364 | startoffset_fsb = XFS_B_TO_FSB(mp, offset); | |
4365 | end_dmi_offset = offset + len; | |
4366 | endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset); | |
4367 | ||
4368 | if (offset < ip->i_d.di_size && | |
4369 | (attr_flags & ATTR_DMI) == 0 && | |
4370 | DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) { | |
4371 | if (end_dmi_offset > ip->i_d.di_size) | |
4372 | end_dmi_offset = ip->i_d.di_size; | |
4373 | error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, vp, | |
4374 | offset, end_dmi_offset - offset, | |
4375 | AT_DELAY_FLAG(attr_flags), NULL); | |
4376 | if (error) | |
4377 | return(error); | |
4378 | } | |
4379 | ||
4380 | ASSERT(attr_flags & ATTR_NOLOCK ? attr_flags & ATTR_DMI : 1); | |
4381 | if (attr_flags & ATTR_NOLOCK) | |
4382 | need_iolock = 0; | |
4383 | if (need_iolock) | |
4384 | xfs_ilock(ip, XFS_IOLOCK_EXCL); | |
4385 | ||
4386 | rounding = MAX((__uint8_t)(1 << mp->m_sb.sb_blocklog), | |
4387 | (__uint8_t)NBPP); | |
4388 | ilen = len + (offset & (rounding - 1)); | |
4389 | ioffset = offset & ~(rounding - 1); | |
4390 | if (ilen & (rounding - 1)) | |
4391 | ilen = (ilen + rounding) & ~(rounding - 1); | |
4392 | ||
4393 | if (VN_CACHED(vp) != 0) { | |
4394 | xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1, | |
4395 | ctooff(offtoct(ioffset)), -1); | |
4396 | VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(ioffset)), | |
4397 | -1, FI_REMAPF_LOCKED); | |
4398 | } | |
4399 | ||
4400 | /* | |
4401 | * Need to zero the stuff we're not freeing, on disk. | |
4402 | * If its a realtime file & can't use unwritten extents then we | |
4403 | * actually need to zero the extent edges. Otherwise xfs_bunmapi | |
4404 | * will take care of it for us. | |
4405 | */ | |
4406 | if (rt && !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) { | |
4407 | nimap = 1; | |
4408 | error = xfs_bmapi(NULL, ip, startoffset_fsb, 1, 0, NULL, 0, | |
4409 | &imap, &nimap, NULL); | |
4410 | if (error) | |
4411 | goto out_unlock_iolock; | |
4412 | ASSERT(nimap == 0 || nimap == 1); | |
4413 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
4414 | xfs_daddr_t block; | |
4415 | ||
4416 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
4417 | block = imap.br_startblock; | |
4418 | mod = do_div(block, mp->m_sb.sb_rextsize); | |
4419 | if (mod) | |
4420 | startoffset_fsb += mp->m_sb.sb_rextsize - mod; | |
4421 | } | |
4422 | nimap = 1; | |
4423 | error = xfs_bmapi(NULL, ip, endoffset_fsb - 1, 1, 0, NULL, 0, | |
4424 | &imap, &nimap, NULL); | |
4425 | if (error) | |
4426 | goto out_unlock_iolock; | |
4427 | ASSERT(nimap == 0 || nimap == 1); | |
4428 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { | |
4429 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); | |
4430 | mod++; | |
4431 | if (mod && (mod != mp->m_sb.sb_rextsize)) | |
4432 | endoffset_fsb -= mod; | |
4433 | } | |
4434 | } | |
4435 | if ((done = (endoffset_fsb <= startoffset_fsb))) | |
4436 | /* | |
4437 | * One contiguous piece to clear | |
4438 | */ | |
4439 | error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); | |
4440 | else { | |
4441 | /* | |
4442 | * Some full blocks, possibly two pieces to clear | |
4443 | */ | |
4444 | if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) | |
4445 | error = xfs_zero_remaining_bytes(ip, offset, | |
4446 | XFS_FSB_TO_B(mp, startoffset_fsb) - 1); | |
4447 | if (!error && | |
4448 | XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) | |
4449 | error = xfs_zero_remaining_bytes(ip, | |
4450 | XFS_FSB_TO_B(mp, endoffset_fsb), | |
4451 | offset + len - 1); | |
4452 | } | |
4453 | ||
4454 | /* | |
4455 | * free file space until done or until there is an error | |
4456 | */ | |
4457 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); | |
4458 | while (!error && !done) { | |
4459 | ||
4460 | /* | |
4461 | * allocate and setup the transaction | |
4462 | */ | |
4463 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); | |
4464 | error = xfs_trans_reserve(tp, | |
4465 | resblks, | |
4466 | XFS_WRITE_LOG_RES(mp), | |
4467 | 0, | |
4468 | XFS_TRANS_PERM_LOG_RES, | |
4469 | XFS_WRITE_LOG_COUNT); | |
4470 | ||
4471 | /* | |
4472 | * check for running out of space | |
4473 | */ | |
4474 | if (error) { | |
4475 | /* | |
4476 | * Free the transaction structure. | |
4477 | */ | |
4478 | ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); | |
4479 | xfs_trans_cancel(tp, 0); | |
4480 | break; | |
4481 | } | |
4482 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
4483 | error = XFS_TRANS_RESERVE_QUOTA(mp, tp, | |
4484 | ip->i_udquot, ip->i_gdquot, resblks, 0, rt ? | |
4485 | XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS); | |
4486 | if (error) | |
4487 | goto error1; | |
4488 | ||
4489 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
4490 | xfs_trans_ihold(tp, ip); | |
4491 | ||
4492 | /* | |
4493 | * issue the bunmapi() call to free the blocks | |
4494 | */ | |
4495 | XFS_BMAP_INIT(&free_list, &firstfsb); | |
4496 | error = xfs_bunmapi(tp, ip, startoffset_fsb, | |
4497 | endoffset_fsb - startoffset_fsb, | |
4498 | 0, 2, &firstfsb, &free_list, &done); | |
4499 | if (error) { | |
4500 | goto error0; | |
4501 | } | |
4502 | ||
4503 | /* | |
4504 | * complete the transaction | |
4505 | */ | |
4506 | error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); | |
4507 | if (error) { | |
4508 | goto error0; | |
4509 | } | |
4510 | ||
4511 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); | |
4512 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4513 | } | |
4514 | ||
4515 | out_unlock_iolock: | |
4516 | if (need_iolock) | |
4517 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); | |
4518 | return error; | |
4519 | ||
4520 | error0: | |
4521 | xfs_bmap_cancel(&free_list); | |
4522 | error1: | |
4523 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); | |
4524 | xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) : | |
4525 | XFS_ILOCK_EXCL); | |
4526 | return error; | |
4527 | } | |
4528 | ||
4529 | /* | |
4530 | * xfs_change_file_space() | |
4531 | * This routine allocates or frees disk space for the given file. | |
4532 | * The user specified parameters are checked for alignment and size | |
4533 | * limitations. | |
4534 | * | |
4535 | * RETURNS: | |
4536 | * 0 on success | |
4537 | * errno on error | |
4538 | * | |
4539 | */ | |
4540 | int | |
4541 | xfs_change_file_space( | |
4542 | bhv_desc_t *bdp, | |
4543 | int cmd, | |
4544 | xfs_flock64_t *bf, | |
4545 | xfs_off_t offset, | |
4546 | cred_t *credp, | |
4547 | int attr_flags) | |
4548 | { | |
4549 | int clrprealloc; | |
4550 | int error; | |
4551 | xfs_fsize_t fsize; | |
4552 | xfs_inode_t *ip; | |
4553 | xfs_mount_t *mp; | |
4554 | int setprealloc; | |
4555 | xfs_off_t startoffset; | |
4556 | xfs_off_t llen; | |
4557 | xfs_trans_t *tp; | |
4558 | vattr_t va; | |
4559 | vnode_t *vp; | |
4560 | ||
4561 | vp = BHV_TO_VNODE(bdp); | |
4562 | vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); | |
4563 | ||
4564 | ip = XFS_BHVTOI(bdp); | |
4565 | mp = ip->i_mount; | |
4566 | ||
4567 | /* | |
4568 | * must be a regular file and have write permission | |
4569 | */ | |
4570 | if (vp->v_type != VREG) | |
4571 | return XFS_ERROR(EINVAL); | |
4572 | ||
4573 | xfs_ilock(ip, XFS_ILOCK_SHARED); | |
4574 | ||
4575 | if ((error = xfs_iaccess(ip, S_IWUSR, credp))) { | |
4576 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
4577 | return error; | |
4578 | } | |
4579 | ||
4580 | xfs_iunlock(ip, XFS_ILOCK_SHARED); | |
4581 | ||
4582 | switch (bf->l_whence) { | |
4583 | case 0: /*SEEK_SET*/ | |
4584 | break; | |
4585 | case 1: /*SEEK_CUR*/ | |
4586 | bf->l_start += offset; | |
4587 | break; | |
4588 | case 2: /*SEEK_END*/ | |
4589 | bf->l_start += ip->i_d.di_size; | |
4590 | break; | |
4591 | default: | |
4592 | return XFS_ERROR(EINVAL); | |
4593 | } | |
4594 | ||
4595 | llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len; | |
4596 | ||
4597 | if ( (bf->l_start < 0) | |
4598 | || (bf->l_start > XFS_MAXIOFFSET(mp)) | |
4599 | || (bf->l_start + llen < 0) | |
4600 | || (bf->l_start + llen > XFS_MAXIOFFSET(mp))) | |
4601 | return XFS_ERROR(EINVAL); | |
4602 | ||
4603 | bf->l_whence = 0; | |
4604 | ||
4605 | startoffset = bf->l_start; | |
4606 | fsize = ip->i_d.di_size; | |
4607 | ||
4608 | /* | |
4609 | * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve | |
4610 | * file space. | |
4611 | * These calls do NOT zero the data space allocated to the file, | |
4612 | * nor do they change the file size. | |
4613 | * | |
4614 | * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file | |
4615 | * space. | |
4616 | * These calls cause the new file data to be zeroed and the file | |
4617 | * size to be changed. | |
4618 | */ | |
4619 | setprealloc = clrprealloc = 0; | |
4620 | ||
4621 | switch (cmd) { | |
4622 | case XFS_IOC_RESVSP: | |
4623 | case XFS_IOC_RESVSP64: | |
4624 | error = xfs_alloc_file_space(ip, startoffset, bf->l_len, | |
4625 | 1, attr_flags); | |
4626 | if (error) | |
4627 | return error; | |
4628 | setprealloc = 1; | |
4629 | break; | |
4630 | ||
4631 | case XFS_IOC_UNRESVSP: | |
4632 | case XFS_IOC_UNRESVSP64: | |
4633 | if ((error = xfs_free_file_space(ip, startoffset, bf->l_len, | |
4634 | attr_flags))) | |
4635 | return error; | |
4636 | break; | |
4637 | ||
4638 | case XFS_IOC_ALLOCSP: | |
4639 | case XFS_IOC_ALLOCSP64: | |
4640 | case XFS_IOC_FREESP: | |
4641 | case XFS_IOC_FREESP64: | |
4642 | if (startoffset > fsize) { | |
4643 | error = xfs_alloc_file_space(ip, fsize, | |
4644 | startoffset - fsize, 0, attr_flags); | |
4645 | if (error) | |
4646 | break; | |
4647 | } | |
4648 | ||
4649 | va.va_mask = XFS_AT_SIZE; | |
4650 | va.va_size = startoffset; | |
4651 | ||
4652 | error = xfs_setattr(bdp, &va, attr_flags, credp); | |
4653 | ||
4654 | if (error) | |
4655 | return error; | |
4656 | ||
4657 | clrprealloc = 1; | |
4658 | break; | |
4659 | ||
4660 | default: | |
4661 | ASSERT(0); | |
4662 | return XFS_ERROR(EINVAL); | |
4663 | } | |
4664 | ||
4665 | /* | |
4666 | * update the inode timestamp, mode, and prealloc flag bits | |
4667 | */ | |
4668 | tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID); | |
4669 | ||
4670 | if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp), | |
4671 | 0, 0, 0))) { | |
4672 | /* ASSERT(0); */ | |
4673 | xfs_trans_cancel(tp, 0); | |
4674 | return error; | |
4675 | } | |
4676 | ||
4677 | xfs_ilock(ip, XFS_ILOCK_EXCL); | |
4678 | ||
4679 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); | |
4680 | xfs_trans_ihold(tp, ip); | |
4681 | ||
4682 | if ((attr_flags & ATTR_DMI) == 0) { | |
4683 | ip->i_d.di_mode &= ~S_ISUID; | |
4684 | ||
4685 | /* | |
4686 | * Note that we don't have to worry about mandatory | |
4687 | * file locking being disabled here because we only | |
4688 | * clear the S_ISGID bit if the Group execute bit is | |
4689 | * on, but if it was on then mandatory locking wouldn't | |
4690 | * have been enabled. | |
4691 | */ | |
4692 | if (ip->i_d.di_mode & S_IXGRP) | |
4693 | ip->i_d.di_mode &= ~S_ISGID; | |
4694 | ||
4695 | xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); | |
4696 | } | |
4697 | if (setprealloc) | |
4698 | ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; | |
4699 | else if (clrprealloc) | |
4700 | ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; | |
4701 | ||
4702 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
4703 | xfs_trans_set_sync(tp); | |
4704 | ||
4705 | error = xfs_trans_commit(tp, 0, NULL); | |
4706 | ||
4707 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
4708 | ||
4709 | return error; | |
4710 | } | |
4711 | ||
4712 | vnodeops_t xfs_vnodeops = { | |
4713 | BHV_IDENTITY_INIT(VN_BHV_XFS,VNODE_POSITION_XFS), | |
4714 | .vop_open = xfs_open, | |
4715 | .vop_read = xfs_read, | |
4716 | #ifdef HAVE_SENDFILE | |
4717 | .vop_sendfile = xfs_sendfile, | |
4718 | #endif | |
4719 | .vop_write = xfs_write, | |
4720 | .vop_ioctl = xfs_ioctl, | |
4721 | .vop_getattr = xfs_getattr, | |
4722 | .vop_setattr = xfs_setattr, | |
4723 | .vop_access = xfs_access, | |
4724 | .vop_lookup = xfs_lookup, | |
4725 | .vop_create = xfs_create, | |
4726 | .vop_remove = xfs_remove, | |
4727 | .vop_link = xfs_link, | |
4728 | .vop_rename = xfs_rename, | |
4729 | .vop_mkdir = xfs_mkdir, | |
4730 | .vop_rmdir = xfs_rmdir, | |
4731 | .vop_readdir = xfs_readdir, | |
4732 | .vop_symlink = xfs_symlink, | |
4733 | .vop_readlink = xfs_readlink, | |
4734 | .vop_fsync = xfs_fsync, | |
4735 | .vop_inactive = xfs_inactive, | |
4736 | .vop_fid2 = xfs_fid2, | |
4737 | .vop_rwlock = xfs_rwlock, | |
4738 | .vop_rwunlock = xfs_rwunlock, | |
4739 | .vop_bmap = xfs_bmap, | |
4740 | .vop_reclaim = xfs_reclaim, | |
4741 | .vop_attr_get = xfs_attr_get, | |
4742 | .vop_attr_set = xfs_attr_set, | |
4743 | .vop_attr_remove = xfs_attr_remove, | |
4744 | .vop_attr_list = xfs_attr_list, | |
4745 | .vop_link_removed = (vop_link_removed_t)fs_noval, | |
4746 | .vop_vnode_change = (vop_vnode_change_t)fs_noval, | |
4747 | .vop_tosspages = fs_tosspages, | |
4748 | .vop_flushinval_pages = fs_flushinval_pages, | |
4749 | .vop_flush_pages = fs_flush_pages, | |
4750 | .vop_release = xfs_release, | |
4751 | .vop_iflush = xfs_inode_flush, | |
4752 | }; |