1 | /* $NetBSD: tmpfs_rename.c,v 1.8 2015/07/06 10:24:59 wiz Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2012 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Taylor R Campbell. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /* |
33 | * tmpfs rename |
34 | */ |
35 | |
36 | #include <sys/cdefs.h> |
37 | __KERNEL_RCSID(0, "$NetBSD: tmpfs_rename.c,v 1.8 2015/07/06 10:24:59 wiz Exp $" ); |
38 | |
39 | #include <sys/param.h> |
40 | #include <sys/errno.h> |
41 | #include <sys/kauth.h> |
42 | #include <sys/mount.h> |
43 | #include <sys/namei.h> |
44 | #include <sys/stat.h> |
45 | #include <sys/vnode.h> |
46 | #include <sys/vnode_if.h> |
47 | |
48 | #include <miscfs/genfs/genfs.h> |
49 | |
50 | #include <fs/tmpfs/tmpfs_vnops.h> |
51 | #include <fs/tmpfs/tmpfs.h> |
52 | |
53 | /* |
54 | * Forward declarations |
55 | */ |
56 | |
57 | static int tmpfs_sane_rename(struct vnode *, struct componentname *, |
58 | struct vnode *, struct componentname *, |
59 | kauth_cred_t, bool); |
60 | static bool tmpfs_rmdired_p(struct vnode *); |
61 | static int tmpfs_gro_lock_directory(struct mount *, struct vnode *); |
62 | |
63 | static const struct genfs_rename_ops tmpfs_genfs_rename_ops; |
64 | |
65 | /* |
66 | * tmpfs_sane_rename: The hairiest vop, with the saner API. |
67 | * |
68 | * Arguments: |
69 | * |
70 | * . fdvp (from directory vnode), |
71 | * . fcnp (from component name), |
72 | * . tdvp (to directory vnode), |
73 | * . tcnp (to component name), |
74 | * . cred (credentials structure), and |
75 | * . posixly_correct (flag for behaviour if target & source link same file). |
76 | * |
77 | * fdvp and tdvp may be the same, and must be referenced and unlocked. |
78 | */ |
79 | static int |
80 | tmpfs_sane_rename( |
81 | struct vnode *fdvp, struct componentname *fcnp, |
82 | struct vnode *tdvp, struct componentname *tcnp, |
83 | kauth_cred_t cred, bool posixly_correct) |
84 | { |
85 | struct tmpfs_dirent *fdirent, *tdirent; |
86 | |
87 | return genfs_sane_rename(&tmpfs_genfs_rename_ops, |
88 | fdvp, fcnp, &fdirent, tdvp, tcnp, &tdirent, |
89 | cred, posixly_correct); |
90 | } |
91 | |
92 | /* |
93 | * tmpfs_rename: The hairiest vop, with the insanest API. Defer to |
94 | * genfs_insane_rename immediately. |
95 | */ |
96 | int |
97 | tmpfs_rename(void *v) |
98 | { |
99 | |
100 | return genfs_insane_rename(v, &tmpfs_sane_rename); |
101 | } |
102 | |
103 | /* |
104 | * tmpfs_gro_directory_empty_p: Return true if the directory vp is |
105 | * empty. dvp is its parent. |
106 | * |
107 | * vp and dvp must be locked and referenced. |
108 | */ |
109 | static bool |
110 | tmpfs_gro_directory_empty_p(struct mount *mp, kauth_cred_t cred, |
111 | struct vnode *vp, struct vnode *dvp) |
112 | { |
113 | |
114 | (void)mp; |
115 | (void)cred; |
116 | (void)dvp; |
117 | KASSERT(mp != NULL); |
118 | KASSERT(vp != NULL); |
119 | KASSERT(dvp != NULL); |
120 | KASSERT(vp != dvp); |
121 | KASSERT(vp->v_mount == mp); |
122 | KASSERT(dvp->v_mount == mp); |
123 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
124 | KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); |
125 | |
126 | return (VP_TO_TMPFS_NODE(vp)->tn_size == 0); |
127 | } |
128 | |
129 | /* |
130 | * tmpfs_gro_rename_check_possible: Check whether a rename is possible |
131 | * independent of credentials. |
132 | */ |
133 | static int |
134 | tmpfs_gro_rename_check_possible(struct mount *mp, |
135 | struct vnode *fdvp, struct vnode *fvp, |
136 | struct vnode *tdvp, struct vnode *tvp) |
137 | { |
138 | |
139 | (void)mp; |
140 | KASSERT(mp != NULL); |
141 | KASSERT(fdvp != NULL); |
142 | KASSERT(fvp != NULL); |
143 | KASSERT(tdvp != NULL); |
144 | KASSERT(fdvp != fvp); |
145 | KASSERT(fdvp != tvp); |
146 | KASSERT(tdvp != fvp); |
147 | KASSERT(tdvp != tvp); |
148 | KASSERT(fvp != tvp); |
149 | KASSERT(fdvp->v_type == VDIR); |
150 | KASSERT(tdvp->v_type == VDIR); |
151 | KASSERT(fdvp->v_mount == mp); |
152 | KASSERT(fvp->v_mount == mp); |
153 | KASSERT(tdvp->v_mount == mp); |
154 | KASSERT((tvp == NULL) || (tvp->v_mount == mp)); |
155 | KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE); |
156 | KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE); |
157 | KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); |
158 | KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); |
159 | |
160 | return genfs_ufslike_rename_check_possible( |
161 | VP_TO_TMPFS_NODE(fdvp)->tn_flags, VP_TO_TMPFS_NODE(fvp)->tn_flags, |
162 | VP_TO_TMPFS_NODE(tdvp)->tn_flags, |
163 | (tvp? VP_TO_TMPFS_NODE(tvp)->tn_flags : 0), (tvp != NULL), |
164 | IMMUTABLE, APPEND); |
165 | } |
166 | |
167 | /* |
168 | * tmpfs_gro_rename_check_permitted: Check whether a rename is |
169 | * permitted given our credentials. |
170 | */ |
171 | static int |
172 | tmpfs_gro_rename_check_permitted(struct mount *mp, kauth_cred_t cred, |
173 | struct vnode *fdvp, struct vnode *fvp, |
174 | struct vnode *tdvp, struct vnode *tvp) |
175 | { |
176 | |
177 | (void)mp; |
178 | KASSERT(mp != NULL); |
179 | KASSERT(fdvp != NULL); |
180 | KASSERT(fvp != NULL); |
181 | KASSERT(tdvp != NULL); |
182 | KASSERT(fdvp != fvp); |
183 | KASSERT(fdvp != tvp); |
184 | KASSERT(tdvp != fvp); |
185 | KASSERT(tdvp != tvp); |
186 | KASSERT(fvp != tvp); |
187 | KASSERT(fdvp->v_type == VDIR); |
188 | KASSERT(tdvp->v_type == VDIR); |
189 | KASSERT(fdvp->v_mount == mp); |
190 | KASSERT(fvp->v_mount == mp); |
191 | KASSERT(tdvp->v_mount == mp); |
192 | KASSERT((tvp == NULL) || (tvp->v_mount == mp)); |
193 | KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE); |
194 | KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE); |
195 | KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); |
196 | KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); |
197 | |
198 | return genfs_ufslike_rename_check_permitted(cred, |
199 | fdvp, VP_TO_TMPFS_NODE(fdvp)->tn_mode, |
200 | VP_TO_TMPFS_NODE(fdvp)->tn_uid, |
201 | fvp, VP_TO_TMPFS_NODE(fvp)->tn_uid, |
202 | tdvp, VP_TO_TMPFS_NODE(tdvp)->tn_mode, |
203 | VP_TO_TMPFS_NODE(tdvp)->tn_uid, |
204 | tvp, (tvp? VP_TO_TMPFS_NODE(tvp)->tn_uid : 0)); |
205 | } |
206 | |
207 | /* |
208 | * tmpfs_gro_remove_check_possible: Check whether a remove is possible |
209 | * independent of credentials. |
210 | */ |
211 | static int |
212 | tmpfs_gro_remove_check_possible(struct mount *mp, |
213 | struct vnode *dvp, struct vnode *vp) |
214 | { |
215 | |
216 | (void)mp; |
217 | KASSERT(mp != NULL); |
218 | KASSERT(dvp != NULL); |
219 | KASSERT(vp != NULL); |
220 | KASSERT(dvp != vp); |
221 | KASSERT(dvp->v_type == VDIR); |
222 | KASSERT(vp->v_type != VDIR); |
223 | KASSERT(dvp->v_mount == mp); |
224 | KASSERT(vp->v_mount == mp); |
225 | KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); |
226 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
227 | |
228 | return genfs_ufslike_remove_check_possible( |
229 | VP_TO_TMPFS_NODE(dvp)->tn_flags, VP_TO_TMPFS_NODE(vp)->tn_flags, |
230 | IMMUTABLE, APPEND); |
231 | } |
232 | |
233 | /* |
234 | * tmpfs_gro_remove_check_permitted: Check whether a remove is |
235 | * permitted given our credentials. |
236 | */ |
237 | static int |
238 | tmpfs_gro_remove_check_permitted(struct mount *mp, kauth_cred_t cred, |
239 | struct vnode *dvp, struct vnode *vp) |
240 | { |
241 | |
242 | (void)mp; |
243 | KASSERT(mp != NULL); |
244 | KASSERT(dvp != NULL); |
245 | KASSERT(vp != NULL); |
246 | KASSERT(dvp != vp); |
247 | KASSERT(dvp->v_type == VDIR); |
248 | KASSERT(vp->v_type != VDIR); |
249 | KASSERT(dvp->v_mount == mp); |
250 | KASSERT(vp->v_mount == mp); |
251 | KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); |
252 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
253 | |
254 | return genfs_ufslike_remove_check_permitted(cred, |
255 | dvp, VP_TO_TMPFS_NODE(dvp)->tn_mode, VP_TO_TMPFS_NODE(dvp)->tn_uid, |
256 | vp, VP_TO_TMPFS_NODE(vp)->tn_uid); |
257 | } |
258 | |
259 | /* |
260 | * tmpfs_gro_rename: Actually perform the rename operation. |
261 | */ |
262 | static int |
263 | tmpfs_gro_rename(struct mount *mp, kauth_cred_t cred, |
264 | struct vnode *fdvp, struct componentname *fcnp, |
265 | void *fde, struct vnode *fvp, |
266 | struct vnode *tdvp, struct componentname *tcnp, |
267 | void *tde, struct vnode *tvp) |
268 | { |
269 | tmpfs_node_t *fdnode = VP_TO_TMPFS_DIR(fdvp); |
270 | tmpfs_node_t *tdnode = VP_TO_TMPFS_DIR(tdvp); |
271 | struct tmpfs_dirent **fdep = fde; |
272 | struct tmpfs_dirent **tdep = tde; |
273 | char *newname; |
274 | |
275 | (void)cred; |
276 | KASSERT(mp != NULL); |
277 | KASSERT(fdvp != NULL); |
278 | KASSERT(fcnp != NULL); |
279 | KASSERT(fdep != NULL); |
280 | KASSERT(fvp != NULL); |
281 | KASSERT(tdvp != NULL); |
282 | KASSERT(tcnp != NULL); |
283 | KASSERT(tdep != NULL); |
284 | KASSERT(fdep != tdep); |
285 | KASSERT((*fdep) != (*tdep)); |
286 | KASSERT((*fdep) != NULL); |
287 | KASSERT((*fdep)->td_node == VP_TO_TMPFS_NODE(fvp)); |
288 | KASSERT((tvp == NULL) || ((*tdep) != NULL)); |
289 | KASSERT((tvp == NULL) || ((*tdep)->td_node == VP_TO_TMPFS_NODE(tvp))); |
290 | KASSERT(fdvp != fvp); |
291 | KASSERT(fdvp != tvp); |
292 | KASSERT(tdvp != fvp); |
293 | KASSERT(tdvp != tvp); |
294 | KASSERT(fvp != tvp); |
295 | KASSERT(fdvp->v_mount == mp); |
296 | KASSERT(fvp->v_mount == mp); |
297 | KASSERT(tdvp->v_mount == mp); |
298 | KASSERT((tvp == NULL) || (tvp->v_mount == mp)); |
299 | KASSERT(VOP_ISLOCKED(fdvp) == LK_EXCLUSIVE); |
300 | KASSERT(VOP_ISLOCKED(fvp) == LK_EXCLUSIVE); |
301 | KASSERT(VOP_ISLOCKED(tdvp) == LK_EXCLUSIVE); |
302 | KASSERT((tvp == NULL) || (VOP_ISLOCKED(tvp) == LK_EXCLUSIVE)); |
303 | |
304 | if (tmpfs_strname_neqlen(fcnp, tcnp)) { |
305 | newname = tmpfs_strname_alloc(VFS_TO_TMPFS(mp), |
306 | tcnp->cn_namelen); |
307 | if (newname == NULL) |
308 | return ENOSPC; |
309 | } else { |
310 | newname = NULL; |
311 | } |
312 | |
313 | /* |
314 | * If we are moving from one directory to another, detach the |
315 | * source entry and reattach it to the target directory. |
316 | */ |
317 | if (fdvp != tdvp) { |
318 | tmpfs_dir_detach(fdnode, *fdep); |
319 | tmpfs_dir_attach(tdnode, *fdep, VP_TO_TMPFS_NODE(fvp)); |
320 | } else if (tvp == NULL) { |
321 | /* |
322 | * We are changing the directory. tmpfs_dir_attach and |
323 | * tmpfs_dir_detach note the events for us, but for |
324 | * this case we don't call them, so we must note the |
325 | * event explicitly. |
326 | */ |
327 | VN_KNOTE(fdvp, NOTE_WRITE); |
328 | } |
329 | |
330 | /* |
331 | * If we are replacing an existing target entry, delete it. |
332 | * |
333 | * XXX What if the target is a directory with whiteout entries? |
334 | */ |
335 | if (tvp != NULL) { |
336 | tdnode = VP_TO_TMPFS_DIR(tdvp); |
337 | |
338 | KASSERT((*tdep) != NULL); |
339 | KASSERT((*tdep)->td_node == VP_TO_TMPFS_NODE(tvp)); |
340 | KASSERT((fvp->v_type == VDIR) == (tvp->v_type == VDIR)); |
341 | if (tvp->v_type == VDIR) { |
342 | KASSERT(VP_TO_TMPFS_NODE(tvp)->tn_size == 0); |
343 | KASSERT(VP_TO_TMPFS_NODE(tvp)->tn_links == 2); |
344 | |
345 | /* |
346 | * Decrement the extra link count for `.' so |
347 | * the vnode will be recycled when released. |
348 | */ |
349 | VP_TO_TMPFS_NODE(tvp)->tn_links--; |
350 | } |
351 | tmpfs_dir_detach(tdnode, *tdep); |
352 | tmpfs_free_dirent(VFS_TO_TMPFS(mp), *tdep); |
353 | } |
354 | |
355 | /* |
356 | * Update the directory entry's name if necessary, and flag |
357 | * metadata updates. A memory allocation failure here is not |
358 | * OK because we've already committed some changes that we |
359 | * can't back out at this point, hence the early allocation |
360 | * above. |
361 | */ |
362 | if (newname != NULL) { |
363 | KASSERT(tcnp->cn_namelen <= TMPFS_MAXNAMLEN); |
364 | |
365 | tmpfs_strname_free(VFS_TO_TMPFS(mp), (*fdep)->td_name, |
366 | (*fdep)->td_namelen); |
367 | (*fdep)->td_namelen = (uint16_t)tcnp->cn_namelen; |
368 | (void)memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen); |
369 | (*fdep)->td_name = newname; |
370 | } |
371 | |
372 | /* |
373 | * Update the timestamps of both parent directories and |
374 | * the renamed file itself. |
375 | */ |
376 | tmpfs_update(fdvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
377 | tmpfs_update(tdvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
378 | tmpfs_update(fvp, TMPFS_UPDATE_CTIME); |
379 | |
380 | VN_KNOTE(fvp, NOTE_RENAME); |
381 | |
382 | genfs_rename_cache_purge(fdvp, fvp, tdvp, tvp); |
383 | |
384 | return 0; |
385 | } |
386 | |
387 | /* |
388 | * tmpfs_gro_remove: Rename an object over another link to itself, |
389 | * effectively removing just the original link. |
390 | */ |
391 | static int |
392 | tmpfs_gro_remove(struct mount *mp, kauth_cred_t cred, |
393 | struct vnode *dvp, struct componentname *cnp, void *de, struct vnode *vp) |
394 | { |
395 | tmpfs_node_t *dnode = VP_TO_TMPFS_DIR(dvp); |
396 | struct tmpfs_dirent **dep = de; |
397 | |
398 | (void)vp; |
399 | KASSERT(mp != NULL); |
400 | KASSERT(dvp != NULL); |
401 | KASSERT(cnp != NULL); |
402 | KASSERT(dep != NULL); |
403 | KASSERT(vp != NULL); |
404 | KASSERT(dvp != vp); |
405 | KASSERT(dvp->v_mount == mp); |
406 | KASSERT(vp->v_mount == mp); |
407 | KASSERT(dvp->v_type == VDIR); |
408 | KASSERT(vp->v_type != VDIR); |
409 | KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); |
410 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
411 | |
412 | tmpfs_dir_detach(dnode, *dep); |
413 | tmpfs_free_dirent(VFS_TO_TMPFS(mp), *dep); |
414 | tmpfs_update(dvp, TMPFS_UPDATE_MTIME | TMPFS_UPDATE_CTIME); |
415 | |
416 | return 0; |
417 | } |
418 | |
419 | /* |
420 | * tmpfs_gro_lookup: Look up and save the lookup results. |
421 | */ |
422 | static int |
423 | tmpfs_gro_lookup(struct mount *mp, struct vnode *dvp, |
424 | struct componentname *cnp, void *de_ret, struct vnode **vp_ret) |
425 | { |
426 | struct tmpfs_dirent *dirent, **dep_ret = de_ret; |
427 | struct vnode *vp; |
428 | int error __diagused; |
429 | |
430 | (void)mp; |
431 | KASSERT(mp != NULL); |
432 | KASSERT(dvp != NULL); |
433 | KASSERT(cnp != NULL); |
434 | KASSERT(dep_ret != NULL); |
435 | KASSERT(vp_ret != NULL); |
436 | KASSERT(VOP_ISLOCKED(dvp) == LK_EXCLUSIVE); |
437 | |
438 | dirent = tmpfs_dir_lookup(VP_TO_TMPFS_NODE(dvp), cnp); |
439 | if (dirent == NULL) |
440 | return ENOENT; |
441 | |
442 | error = vcache_get(mp, &dirent->td_node, sizeof(dirent->td_node), &vp); |
443 | if (error) |
444 | return error; |
445 | KASSERT(vp != NULL); |
446 | |
447 | /* |
448 | * XXX Once namei is fixed, we can change the genfs_rename |
449 | * protocol so that we have to lock vp here. |
450 | */ |
451 | |
452 | *dep_ret = dirent; |
453 | *vp_ret = vp; |
454 | return 0; |
455 | } |
456 | |
457 | /* |
458 | * tmpfs_rmdired_p: Check whether the directory vp has been rmdired. |
459 | * |
460 | * vp must be locked and referenced. |
461 | */ |
462 | static bool |
463 | tmpfs_rmdired_p(struct vnode *vp) |
464 | { |
465 | |
466 | KASSERT(vp != NULL); |
467 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
468 | KASSERT(vp->v_type == VDIR); |
469 | |
470 | return (VP_TO_TMPFS_NODE(vp)->tn_spec.tn_dir.tn_parent == NULL); |
471 | } |
472 | |
473 | /* |
474 | * tmpfs_gro_genealogy: Analyze the genealogy of the source and target |
475 | * directories. |
476 | */ |
477 | static int |
478 | tmpfs_gro_genealogy(struct mount *mp, kauth_cred_t cred, |
479 | struct vnode *fdvp, struct vnode *tdvp, |
480 | struct vnode **intermediate_node_ret) |
481 | { |
482 | struct vnode *vp, *ovp; |
483 | struct tmpfs_node *dnode; |
484 | int error; |
485 | |
486 | (void)cred; |
487 | KASSERT(mp != NULL); |
488 | KASSERT(fdvp != NULL); |
489 | KASSERT(tdvp != NULL); |
490 | KASSERT(fdvp != tdvp); |
491 | KASSERT(intermediate_node_ret != NULL); |
492 | KASSERT(fdvp->v_mount == mp); |
493 | KASSERT(tdvp->v_mount == mp); |
494 | KASSERT(fdvp->v_type == VDIR); |
495 | KASSERT(tdvp->v_type == VDIR); |
496 | |
497 | /* |
498 | * We need to provisionally lock tdvp to keep rmdir from |
499 | * deleting it -- or any ancestor -- at an inopportune moment. |
500 | */ |
501 | error = tmpfs_gro_lock_directory(mp, tdvp); |
502 | if (error) |
503 | return error; |
504 | |
505 | vp = tdvp; |
506 | vref(vp); |
507 | |
508 | for (;;) { |
509 | KASSERT(vp != NULL); |
510 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
511 | KASSERT(vp->v_mount == mp); |
512 | KASSERT(vp->v_type == VDIR); |
513 | KASSERT(!tmpfs_rmdired_p(vp)); |
514 | |
515 | dnode = VP_TO_TMPFS_NODE(vp)->tn_spec.tn_dir.tn_parent; |
516 | |
517 | /* |
518 | * If dnode is null then vp has been rmdir'd, which is |
519 | * not supposed to happen because we have it locked. |
520 | */ |
521 | KASSERT(dnode != NULL); |
522 | |
523 | /* Did we hit the root without finding fdvp? */ |
524 | if (dnode == VP_TO_TMPFS_NODE(vp)) { |
525 | vput(vp); |
526 | *intermediate_node_ret = NULL; |
527 | return 0; |
528 | } |
529 | |
530 | /* Did we find that fdvp is an ancestor of tdvp? */ |
531 | if (dnode == VP_TO_TMPFS_NODE(fdvp)) { |
532 | KASSERT(dnode->tn_vnode == fdvp); |
533 | /* Unlock vp, but keep it referenced. */ |
534 | VOP_UNLOCK(vp); |
535 | *intermediate_node_ret = vp; |
536 | return 0; |
537 | } |
538 | |
539 | /* Neither -- keep ascending the family tree. */ |
540 | ovp = vp; |
541 | vp = NULL; |
542 | error = vcache_get(mp, &dnode, sizeof(dnode), &vp); |
543 | vput(ovp); |
544 | if (error) |
545 | return error; |
546 | error = vn_lock(vp, LK_EXCLUSIVE); |
547 | if (error) { |
548 | vrele(vp); |
549 | return error; |
550 | } |
551 | |
552 | /* |
553 | * vcache_get only guarantees that dnode will not |
554 | * be freed while we get a vnode for it. It does not |
555 | * preserve any other invariants, so we must check |
556 | * whether the parent has been removed in the meantime. |
557 | */ |
558 | if (tmpfs_rmdired_p(vp)) { |
559 | vput(vp); |
560 | return ENOENT; |
561 | } |
562 | } |
563 | } |
564 | |
565 | /* |
566 | * tmpfs_gro_lock_directory: Lock the directory vp, but fail if it has |
567 | * been rmdir'd. |
568 | */ |
569 | static int |
570 | tmpfs_gro_lock_directory(struct mount *mp, struct vnode *vp) |
571 | { |
572 | |
573 | (void)mp; |
574 | KASSERT(mp != NULL); |
575 | KASSERT(vp != NULL); |
576 | KASSERT(vp->v_mount == mp); |
577 | |
578 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
579 | |
580 | if (tmpfs_rmdired_p(vp)) { |
581 | VOP_UNLOCK(vp); |
582 | return ENOENT; |
583 | } |
584 | |
585 | return 0; |
586 | } |
587 | |
588 | static const struct genfs_rename_ops tmpfs_genfs_rename_ops = { |
589 | .gro_directory_empty_p = tmpfs_gro_directory_empty_p, |
590 | .gro_rename_check_possible = tmpfs_gro_rename_check_possible, |
591 | .gro_rename_check_permitted = tmpfs_gro_rename_check_permitted, |
592 | .gro_remove_check_possible = tmpfs_gro_remove_check_possible, |
593 | .gro_remove_check_permitted = tmpfs_gro_remove_check_permitted, |
594 | .gro_rename = tmpfs_gro_rename, |
595 | .gro_remove = tmpfs_gro_remove, |
596 | .gro_lookup = tmpfs_gro_lookup, |
597 | .gro_genealogy = tmpfs_gro_genealogy, |
598 | .gro_lock_directory = tmpfs_gro_lock_directory, |
599 | }; |
600 | |