1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */
2
3 /*-
4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * 2005 program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /*
34 * tmpfs vnode interface.
35 */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include <sys/param.h>
40 #include <sys/fcntl.h>
41 #include <sys/lockf.h>
42 #include <sys/lock.h>
43 #include <sys/namei.h>
44 #include <sys/priv.h>
45 #include <sys/proc.h>
46 #include <sys/rwlock.h>
47 #include <sys/sched.h>
48 #include <sys/stat.h>
49 #include <sys/systm.h>
50 #include <sys/sysctl.h>
51 #include <sys/unistd.h>
52 #include <sys/vnode.h>
53
54 #include <vm/vm.h>
55 #include <vm/vm_param.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_pager.h>
59
60 #include <fs/tmpfs/tmpfs_vnops.h>
61 #include <fs/tmpfs/tmpfs.h>
62
63 SYSCTL_DECL(_vfs_tmpfs);
64
65 static volatile int tmpfs_rename_restarts;
66 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
67 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
68 "Times rename had to restart due to lock contention");
69
70 static int
tmpfs_vn_get_ino_alloc(struct mount * mp,void * arg,int lkflags,struct vnode ** rvp)71 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
72 struct vnode **rvp)
73 {
74
75 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp));
76 }
77
78 static int
tmpfs_lookup(struct vop_cachedlookup_args * v)79 tmpfs_lookup(struct vop_cachedlookup_args *v)
80 {
81 struct vnode *dvp = v->a_dvp;
82 struct vnode **vpp = v->a_vpp;
83 struct componentname *cnp = v->a_cnp;
84 struct tmpfs_dirent *de;
85 struct tmpfs_node *dnode;
86 int error;
87
88 dnode = VP_TO_TMPFS_DIR(dvp);
89 *vpp = NULLVP;
90
91 /* Check accessibility of requested node as a first step. */
92 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
93 if (error != 0)
94 goto out;
95
96 /* We cannot be requesting the parent directory of the root node. */
97 MPASS(IMPLIES(dnode->tn_type == VDIR &&
98 dnode->tn_dir.tn_parent == dnode,
99 !(cnp->cn_flags & ISDOTDOT)));
100
101 TMPFS_ASSERT_LOCKED(dnode);
102 if (dnode->tn_dir.tn_parent == NULL) {
103 error = ENOENT;
104 goto out;
105 }
106 if (cnp->cn_flags & ISDOTDOT) {
107 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
108 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp);
109 if (error != 0)
110 goto out;
111 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
112 VREF(dvp);
113 *vpp = dvp;
114 error = 0;
115 } else {
116 de = tmpfs_dir_lookup(dnode, NULL, cnp);
117 if (de != NULL && de->td_node == NULL)
118 cnp->cn_flags |= ISWHITEOUT;
119 if (de == NULL || de->td_node == NULL) {
120 /* The entry was not found in the directory.
121 * This is OK if we are creating or renaming an
122 * entry and are working on the last component of
123 * the path name. */
124 if ((cnp->cn_flags & ISLASTCN) &&
125 (cnp->cn_nameiop == CREATE || \
126 cnp->cn_nameiop == RENAME ||
127 (cnp->cn_nameiop == DELETE &&
128 cnp->cn_flags & DOWHITEOUT &&
129 cnp->cn_flags & ISWHITEOUT))) {
130 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
131 cnp->cn_thread);
132 if (error != 0)
133 goto out;
134
135 /* Keep the component name in the buffer for
136 * future uses. */
137 cnp->cn_flags |= SAVENAME;
138
139 error = EJUSTRETURN;
140 } else
141 error = ENOENT;
142 } else {
143 struct tmpfs_node *tnode;
144
145 /* The entry was found, so get its associated
146 * tmpfs_node. */
147 tnode = de->td_node;
148
149 /* If we are not at the last path component and
150 * found a non-directory or non-link entry (which
151 * may itself be pointing to a directory), raise
152 * an error. */
153 if ((tnode->tn_type != VDIR &&
154 tnode->tn_type != VLNK) &&
155 !(cnp->cn_flags & ISLASTCN)) {
156 error = ENOTDIR;
157 goto out;
158 }
159
160 /* If we are deleting or renaming the entry, keep
161 * track of its tmpfs_dirent so that it can be
162 * easily deleted later. */
163 if ((cnp->cn_flags & ISLASTCN) &&
164 (cnp->cn_nameiop == DELETE ||
165 cnp->cn_nameiop == RENAME)) {
166 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
167 cnp->cn_thread);
168 if (error != 0)
169 goto out;
170
171 /* Allocate a new vnode on the matching entry. */
172 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
173 cnp->cn_lkflags, vpp);
174 if (error != 0)
175 goto out;
176
177 if ((dnode->tn_mode & S_ISTXT) &&
178 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
179 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
180 error = EPERM;
181 vput(*vpp);
182 *vpp = NULL;
183 goto out;
184 }
185 cnp->cn_flags |= SAVENAME;
186 } else {
187 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
188 cnp->cn_lkflags, vpp);
189 if (error != 0)
190 goto out;
191 }
192 }
193 }
194
195 /* Store the result of this lookup in the cache. Avoid this if the
196 * request was for creation, as it does not improve timings on
197 * emprical tests. */
198 if ((cnp->cn_flags & MAKEENTRY) != 0)
199 cache_enter(dvp, *vpp, cnp);
200
201 out:
202 /* If there were no errors, *vpp cannot be null and it must be
203 * locked. */
204 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
205
206 return error;
207 }
208
209 static int
tmpfs_create(struct vop_create_args * v)210 tmpfs_create(struct vop_create_args *v)
211 {
212 struct vnode *dvp = v->a_dvp;
213 struct vnode **vpp = v->a_vpp;
214 struct componentname *cnp = v->a_cnp;
215 struct vattr *vap = v->a_vap;
216 int error;
217
218 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
219
220 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
221 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0)
222 cache_enter(dvp, *vpp, cnp);
223 return (error);
224 }
225
226 static int
tmpfs_mknod(struct vop_mknod_args * v)227 tmpfs_mknod(struct vop_mknod_args *v)
228 {
229 struct vnode *dvp = v->a_dvp;
230 struct vnode **vpp = v->a_vpp;
231 struct componentname *cnp = v->a_cnp;
232 struct vattr *vap = v->a_vap;
233
234 if (vap->va_type != VBLK && vap->va_type != VCHR &&
235 vap->va_type != VFIFO)
236 return EINVAL;
237
238 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
239 }
240
241 static int
tmpfs_open(struct vop_open_args * v)242 tmpfs_open(struct vop_open_args *v)
243 {
244 struct vnode *vp = v->a_vp;
245 int mode = v->a_mode;
246
247 int error;
248 struct tmpfs_node *node;
249
250 MPASS(VOP_ISLOCKED(vp));
251
252 node = VP_TO_TMPFS_NODE(vp);
253
254 /* The file is still active but all its names have been removed
255 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
256 * it is about to die. */
257 if (node->tn_links < 1)
258 return (ENOENT);
259
260 /* If the file is marked append-only, deny write requests. */
261 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
262 error = EPERM;
263 else {
264 error = 0;
265 /* For regular files, the call below is nop. */
266 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags &
267 OBJ_DEAD) == 0, ("dead object"));
268 vnode_create_vobject(vp, node->tn_size, v->a_td);
269 }
270
271 MPASS(VOP_ISLOCKED(vp));
272 return error;
273 }
274
275 static int
tmpfs_close(struct vop_close_args * v)276 tmpfs_close(struct vop_close_args *v)
277 {
278 struct vnode *vp = v->a_vp;
279
280 /* Update node times. */
281 tmpfs_update(vp);
282
283 return (0);
284 }
285
286 int
tmpfs_access(struct vop_access_args * v)287 tmpfs_access(struct vop_access_args *v)
288 {
289 struct vnode *vp = v->a_vp;
290 accmode_t accmode = v->a_accmode;
291 struct ucred *cred = v->a_cred;
292
293 int error;
294 struct tmpfs_node *node;
295
296 MPASS(VOP_ISLOCKED(vp));
297
298 node = VP_TO_TMPFS_NODE(vp);
299
300 switch (vp->v_type) {
301 case VDIR:
302 /* FALLTHROUGH */
303 case VLNK:
304 /* FALLTHROUGH */
305 case VREG:
306 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
307 error = EROFS;
308 goto out;
309 }
310 break;
311
312 case VBLK:
313 /* FALLTHROUGH */
314 case VCHR:
315 /* FALLTHROUGH */
316 case VSOCK:
317 /* FALLTHROUGH */
318 case VFIFO:
319 break;
320
321 default:
322 error = EINVAL;
323 goto out;
324 }
325
326 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
327 error = EPERM;
328 goto out;
329 }
330
331 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
332 node->tn_gid, accmode, cred, NULL);
333
334 out:
335 MPASS(VOP_ISLOCKED(vp));
336
337 return error;
338 }
339
340 int
tmpfs_getattr(struct vop_getattr_args * v)341 tmpfs_getattr(struct vop_getattr_args *v)
342 {
343 struct vnode *vp = v->a_vp;
344 struct vattr *vap = v->a_vap;
345
346 struct tmpfs_node *node;
347
348 node = VP_TO_TMPFS_NODE(vp);
349
350 tmpfs_update(vp);
351
352 vap->va_type = vp->v_type;
353 vap->va_mode = node->tn_mode;
354 vap->va_nlink = node->tn_links;
355 vap->va_uid = node->tn_uid;
356 vap->va_gid = node->tn_gid;
357 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
358 vap->va_fileid = node->tn_id;
359 vap->va_size = node->tn_size;
360 vap->va_blocksize = PAGE_SIZE;
361 vap->va_atime = node->tn_atime;
362 vap->va_mtime = node->tn_mtime;
363 vap->va_ctime = node->tn_ctime;
364 vap->va_birthtime = node->tn_birthtime;
365 vap->va_gen = node->tn_gen;
366 vap->va_flags = node->tn_flags;
367 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
368 node->tn_rdev : NODEV;
369 vap->va_bytes = round_page(node->tn_size);
370 vap->va_filerev = 0;
371
372 return 0;
373 }
374
375 int
tmpfs_setattr(struct vop_setattr_args * v)376 tmpfs_setattr(struct vop_setattr_args *v)
377 {
378 struct vnode *vp = v->a_vp;
379 struct vattr *vap = v->a_vap;
380 struct ucred *cred = v->a_cred;
381 struct thread *td = curthread;
382
383 int error;
384
385 MPASS(VOP_ISLOCKED(vp));
386
387 error = 0;
388
389 /* Abort if any unsettable attribute is given. */
390 if (vap->va_type != VNON ||
391 vap->va_nlink != VNOVAL ||
392 vap->va_fsid != VNOVAL ||
393 vap->va_fileid != VNOVAL ||
394 vap->va_blocksize != VNOVAL ||
395 vap->va_gen != VNOVAL ||
396 vap->va_rdev != VNOVAL ||
397 vap->va_bytes != VNOVAL)
398 error = EINVAL;
399
400 if (error == 0 && (vap->va_flags != VNOVAL))
401 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
402
403 if (error == 0 && (vap->va_size != VNOVAL))
404 error = tmpfs_chsize(vp, vap->va_size, cred, td);
405
406 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
407 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
408
409 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
410 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
411
412 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
413 vap->va_atime.tv_nsec != VNOVAL) ||
414 (vap->va_mtime.tv_sec != VNOVAL &&
415 vap->va_mtime.tv_nsec != VNOVAL) ||
416 (vap->va_birthtime.tv_sec != VNOVAL &&
417 vap->va_birthtime.tv_nsec != VNOVAL)))
418 error = tmpfs_chtimes(vp, vap, cred, td);
419
420 /* Update the node times. We give preference to the error codes
421 * generated by this function rather than the ones that may arise
422 * from tmpfs_update. */
423 tmpfs_update(vp);
424
425 MPASS(VOP_ISLOCKED(vp));
426
427 return error;
428 }
429
430 static int
tmpfs_read(struct vop_read_args * v)431 tmpfs_read(struct vop_read_args *v)
432 {
433 struct vnode *vp;
434 struct uio *uio;
435 struct tmpfs_node *node;
436
437 vp = v->a_vp;
438 if (vp->v_type != VREG)
439 return (EISDIR);
440 uio = v->a_uio;
441 if (uio->uio_offset < 0)
442 return (EINVAL);
443 node = VP_TO_TMPFS_NODE(vp);
444 node->tn_status |= TMPFS_NODE_ACCESSED;
445 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
446 }
447
448 static int
tmpfs_write(struct vop_write_args * v)449 tmpfs_write(struct vop_write_args *v)
450 {
451 struct vnode *vp;
452 struct uio *uio;
453 struct tmpfs_node *node;
454 off_t oldsize;
455 int error, ioflag;
456
457 vp = v->a_vp;
458 uio = v->a_uio;
459 ioflag = v->a_ioflag;
460 error = 0;
461 node = VP_TO_TMPFS_NODE(vp);
462 oldsize = node->tn_size;
463
464 if (uio->uio_offset < 0 || vp->v_type != VREG)
465 return (EINVAL);
466 if (uio->uio_resid == 0)
467 return (0);
468 if (ioflag & IO_APPEND)
469 uio->uio_offset = node->tn_size;
470 if (uio->uio_offset + uio->uio_resid >
471 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
472 return (EFBIG);
473 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
474 return (EFBIG);
475 if (uio->uio_offset + uio->uio_resid > node->tn_size) {
476 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
477 FALSE);
478 if (error != 0)
479 goto out;
480 }
481
482 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
483 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
484 TMPFS_NODE_CHANGED;
485 if (node->tn_mode & (S_ISUID | S_ISGID)) {
486 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
487 node->tn_mode &= ~(S_ISUID | S_ISGID);
488 }
489 if (error != 0)
490 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
491
492 out:
493 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
494 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
495
496 return (error);
497 }
498
499 static int
tmpfs_fsync(struct vop_fsync_args * v)500 tmpfs_fsync(struct vop_fsync_args *v)
501 {
502 struct vnode *vp = v->a_vp;
503
504 MPASS(VOP_ISLOCKED(vp));
505
506 tmpfs_check_mtime(vp);
507 tmpfs_update(vp);
508
509 return 0;
510 }
511
512 static int
tmpfs_remove(struct vop_remove_args * v)513 tmpfs_remove(struct vop_remove_args *v)
514 {
515 struct vnode *dvp = v->a_dvp;
516 struct vnode *vp = v->a_vp;
517
518 int error;
519 struct tmpfs_dirent *de;
520 struct tmpfs_mount *tmp;
521 struct tmpfs_node *dnode;
522 struct tmpfs_node *node;
523
524 MPASS(VOP_ISLOCKED(dvp));
525 MPASS(VOP_ISLOCKED(vp));
526
527 if (vp->v_type == VDIR) {
528 error = EISDIR;
529 goto out;
530 }
531
532 dnode = VP_TO_TMPFS_DIR(dvp);
533 node = VP_TO_TMPFS_NODE(vp);
534 tmp = VFS_TO_TMPFS(vp->v_mount);
535 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
536 MPASS(de != NULL);
537
538 /* Files marked as immutable or append-only cannot be deleted. */
539 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
540 (dnode->tn_flags & APPEND)) {
541 error = EPERM;
542 goto out;
543 }
544
545 /* Remove the entry from the directory; as it is a file, we do not
546 * have to change the number of hard links of the directory. */
547 tmpfs_dir_detach(dvp, de);
548 if (v->a_cnp->cn_flags & DOWHITEOUT)
549 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
550
551 /* Free the directory entry we just deleted. Note that the node
552 * referred by it will not be removed until the vnode is really
553 * reclaimed. */
554 tmpfs_free_dirent(tmp, de);
555
556 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
557 error = 0;
558
559 out:
560
561 return error;
562 }
563
564 static int
tmpfs_link(struct vop_link_args * v)565 tmpfs_link(struct vop_link_args *v)
566 {
567 struct vnode *dvp = v->a_tdvp;
568 struct vnode *vp = v->a_vp;
569 struct componentname *cnp = v->a_cnp;
570
571 int error;
572 struct tmpfs_dirent *de;
573 struct tmpfs_node *node;
574
575 MPASS(VOP_ISLOCKED(dvp));
576 MPASS(cnp->cn_flags & HASBUF);
577 MPASS(dvp != vp); /* XXX When can this be false? */
578 node = VP_TO_TMPFS_NODE(vp);
579
580 /* Ensure that we do not overflow the maximum number of links imposed
581 * by the system. */
582 MPASS(node->tn_links <= LINK_MAX);
583 if (node->tn_links == LINK_MAX) {
584 error = EMLINK;
585 goto out;
586 }
587
588 /* We cannot create links of files marked immutable or append-only. */
589 if (node->tn_flags & (IMMUTABLE | APPEND)) {
590 error = EPERM;
591 goto out;
592 }
593
594 /* Allocate a new directory entry to represent the node. */
595 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
596 cnp->cn_nameptr, cnp->cn_namelen, &de);
597 if (error != 0)
598 goto out;
599
600 /* Insert the new directory entry into the appropriate directory. */
601 if (cnp->cn_flags & ISWHITEOUT)
602 tmpfs_dir_whiteout_remove(dvp, cnp);
603 tmpfs_dir_attach(dvp, de);
604
605 /* vp link count has changed, so update node times. */
606 node->tn_status |= TMPFS_NODE_CHANGED;
607 tmpfs_update(vp);
608
609 error = 0;
610
611 out:
612 return error;
613 }
614
615 /*
616 * We acquire all but fdvp locks using non-blocking acquisitions. If we
617 * fail to acquire any lock in the path we will drop all held locks,
618 * acquire the new lock in a blocking fashion, and then release it and
619 * restart the rename. This acquire/release step ensures that we do not
620 * spin on a lock waiting for release. On error release all vnode locks
621 * and decrement references the way tmpfs_rename() would do.
622 */
623 static int
tmpfs_rename_relock(struct vnode * fdvp,struct vnode ** fvpp,struct vnode * tdvp,struct vnode ** tvpp,struct componentname * fcnp,struct componentname * tcnp)624 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
625 struct vnode *tdvp, struct vnode **tvpp,
626 struct componentname *fcnp, struct componentname *tcnp)
627 {
628 struct vnode *nvp;
629 struct mount *mp;
630 struct tmpfs_dirent *de;
631 int error, restarts = 0;
632
633 VOP_UNLOCK(tdvp, 0);
634 if (*tvpp != NULL && *tvpp != tdvp)
635 VOP_UNLOCK(*tvpp, 0);
636 mp = fdvp->v_mount;
637
638 relock:
639 restarts += 1;
640 error = vn_lock(fdvp, LK_EXCLUSIVE);
641 if (error)
642 goto releout;
643 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
644 VOP_UNLOCK(fdvp, 0);
645 error = vn_lock(tdvp, LK_EXCLUSIVE);
646 if (error)
647 goto releout;
648 VOP_UNLOCK(tdvp, 0);
649 goto relock;
650 }
651 /*
652 * Re-resolve fvp to be certain it still exists and fetch the
653 * correct vnode.
654 */
655 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
656 if (de == NULL) {
657 VOP_UNLOCK(fdvp, 0);
658 VOP_UNLOCK(tdvp, 0);
659 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
660 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
661 error = EINVAL;
662 else
663 error = ENOENT;
664 goto releout;
665 }
666 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
667 if (error != 0) {
668 VOP_UNLOCK(fdvp, 0);
669 VOP_UNLOCK(tdvp, 0);
670 if (error != EBUSY)
671 goto releout;
672 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
673 if (error != 0)
674 goto releout;
675 VOP_UNLOCK(nvp, 0);
676 /*
677 * Concurrent rename race.
678 */
679 if (nvp == tdvp) {
680 vrele(nvp);
681 error = EINVAL;
682 goto releout;
683 }
684 vrele(*fvpp);
685 *fvpp = nvp;
686 goto relock;
687 }
688 vrele(*fvpp);
689 *fvpp = nvp;
690 VOP_UNLOCK(*fvpp, 0);
691 /*
692 * Re-resolve tvp and acquire the vnode lock if present.
693 */
694 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
695 /*
696 * If tvp disappeared we just carry on.
697 */
698 if (de == NULL && *tvpp != NULL) {
699 vrele(*tvpp);
700 *tvpp = NULL;
701 }
702 /*
703 * Get the tvp ino if the lookup succeeded. We may have to restart
704 * if the non-blocking acquire fails.
705 */
706 if (de != NULL) {
707 nvp = NULL;
708 error = tmpfs_alloc_vp(mp, de->td_node,
709 LK_EXCLUSIVE | LK_NOWAIT, &nvp);
710 if (*tvpp != NULL)
711 vrele(*tvpp);
712 *tvpp = nvp;
713 if (error != 0) {
714 VOP_UNLOCK(fdvp, 0);
715 VOP_UNLOCK(tdvp, 0);
716 if (error != EBUSY)
717 goto releout;
718 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
719 &nvp);
720 if (error != 0)
721 goto releout;
722 VOP_UNLOCK(nvp, 0);
723 /*
724 * fdvp contains fvp, thus tvp (=fdvp) is not empty.
725 */
726 if (nvp == fdvp) {
727 error = ENOTEMPTY;
728 goto releout;
729 }
730 goto relock;
731 }
732 }
733 tmpfs_rename_restarts += restarts;
734
735 return (0);
736
737 releout:
738 vrele(fdvp);
739 vrele(*fvpp);
740 vrele(tdvp);
741 if (*tvpp != NULL)
742 vrele(*tvpp);
743 tmpfs_rename_restarts += restarts;
744
745 return (error);
746 }
747
748 static int
tmpfs_rename(struct vop_rename_args * v)749 tmpfs_rename(struct vop_rename_args *v)
750 {
751 struct vnode *fdvp = v->a_fdvp;
752 struct vnode *fvp = v->a_fvp;
753 struct componentname *fcnp = v->a_fcnp;
754 struct vnode *tdvp = v->a_tdvp;
755 struct vnode *tvp = v->a_tvp;
756 struct componentname *tcnp = v->a_tcnp;
757 struct mount *mp = NULL;
758
759 char *newname;
760 int error;
761 struct tmpfs_dirent *de;
762 struct tmpfs_mount *tmp;
763 struct tmpfs_node *fdnode;
764 struct tmpfs_node *fnode;
765 struct tmpfs_node *tnode;
766 struct tmpfs_node *tdnode;
767
768 MPASS(VOP_ISLOCKED(tdvp));
769 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
770 MPASS(fcnp->cn_flags & HASBUF);
771 MPASS(tcnp->cn_flags & HASBUF);
772
773 /* Disallow cross-device renames.
774 * XXX Why isn't this done by the caller? */
775 if (fvp->v_mount != tdvp->v_mount ||
776 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
777 error = EXDEV;
778 goto out;
779 }
780
781 /* If source and target are the same file, there is nothing to do. */
782 if (fvp == tvp) {
783 error = 0;
784 goto out;
785 }
786
787 /* If we need to move the directory between entries, lock the
788 * source so that we can safely operate on it. */
789 if (fdvp != tdvp && fdvp != tvp) {
790 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
791 mp = tdvp->v_mount;
792 error = vfs_busy(mp, 0);
793 if (error != 0) {
794 mp = NULL;
795 goto out;
796 }
797 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
798 fcnp, tcnp);
799 if (error != 0) {
800 vfs_unbusy(mp);
801 return (error);
802 }
803 ASSERT_VOP_ELOCKED(fdvp,
804 "tmpfs_rename: fdvp not locked");
805 ASSERT_VOP_ELOCKED(tdvp,
806 "tmpfs_rename: tdvp not locked");
807 if (tvp != NULL)
808 ASSERT_VOP_ELOCKED(tvp,
809 "tmpfs_rename: tvp not locked");
810 if (fvp == tvp) {
811 error = 0;
812 goto out_locked;
813 }
814 }
815 }
816
817 tmp = VFS_TO_TMPFS(tdvp->v_mount);
818 tdnode = VP_TO_TMPFS_DIR(tdvp);
819 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
820 fdnode = VP_TO_TMPFS_DIR(fdvp);
821 fnode = VP_TO_TMPFS_NODE(fvp);
822 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
823
824 /* Entry can disappear before we lock fdvp,
825 * also avoid manipulating '.' and '..' entries. */
826 if (de == NULL) {
827 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
828 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
829 error = EINVAL;
830 else
831 error = ENOENT;
832 goto out_locked;
833 }
834 MPASS(de->td_node == fnode);
835
836 /* If re-naming a directory to another preexisting directory
837 * ensure that the target directory is empty so that its
838 * removal causes no side effects.
839 * Kern_rename gurantees the destination to be a directory
840 * if the source is one. */
841 if (tvp != NULL) {
842 MPASS(tnode != NULL);
843
844 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
845 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
846 error = EPERM;
847 goto out_locked;
848 }
849
850 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
851 if (tnode->tn_size > 0) {
852 error = ENOTEMPTY;
853 goto out_locked;
854 }
855 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
856 error = ENOTDIR;
857 goto out_locked;
858 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
859 error = EISDIR;
860 goto out_locked;
861 } else {
862 MPASS(fnode->tn_type != VDIR &&
863 tnode->tn_type != VDIR);
864 }
865 }
866
867 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
868 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
869 error = EPERM;
870 goto out_locked;
871 }
872
873 /* Ensure that we have enough memory to hold the new name, if it
874 * has to be changed. */
875 if (fcnp->cn_namelen != tcnp->cn_namelen ||
876 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
877 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
878 } else
879 newname = NULL;
880
881 /* If the node is being moved to another directory, we have to do
882 * the move. */
883 if (fdnode != tdnode) {
884 /* In case we are moving a directory, we have to adjust its
885 * parent to point to the new parent. */
886 if (de->td_node->tn_type == VDIR) {
887 struct tmpfs_node *n;
888
889 /* Ensure the target directory is not a child of the
890 * directory being moved. Otherwise, we'd end up
891 * with stale nodes. */
892 n = tdnode;
893 /* TMPFS_LOCK garanties that no nodes are freed while
894 * traversing the list. Nodes can only be marked as
895 * removed: tn_parent == NULL. */
896 TMPFS_LOCK(tmp);
897 TMPFS_NODE_LOCK(n);
898 while (n != n->tn_dir.tn_parent) {
899 struct tmpfs_node *parent;
900
901 if (n == fnode) {
902 TMPFS_NODE_UNLOCK(n);
903 TMPFS_UNLOCK(tmp);
904 error = EINVAL;
905 if (newname != NULL)
906 free(newname, M_TMPFSNAME);
907 goto out_locked;
908 }
909 parent = n->tn_dir.tn_parent;
910 TMPFS_NODE_UNLOCK(n);
911 if (parent == NULL) {
912 n = NULL;
913 break;
914 }
915 TMPFS_NODE_LOCK(parent);
916 if (parent->tn_dir.tn_parent == NULL) {
917 TMPFS_NODE_UNLOCK(parent);
918 n = NULL;
919 break;
920 }
921 n = parent;
922 }
923 TMPFS_UNLOCK(tmp);
924 if (n == NULL) {
925 error = EINVAL;
926 if (newname != NULL)
927 free(newname, M_TMPFSNAME);
928 goto out_locked;
929 }
930 TMPFS_NODE_UNLOCK(n);
931
932 /* Adjust the parent pointer. */
933 TMPFS_VALIDATE_DIR(fnode);
934 TMPFS_NODE_LOCK(de->td_node);
935 de->td_node->tn_dir.tn_parent = tdnode;
936 TMPFS_NODE_UNLOCK(de->td_node);
937
938 /* As a result of changing the target of the '..'
939 * entry, the link count of the source and target
940 * directories has to be adjusted. */
941 TMPFS_NODE_LOCK(tdnode);
942 TMPFS_ASSERT_LOCKED(tdnode);
943 tdnode->tn_links++;
944 TMPFS_NODE_UNLOCK(tdnode);
945
946 TMPFS_NODE_LOCK(fdnode);
947 TMPFS_ASSERT_LOCKED(fdnode);
948 fdnode->tn_links--;
949 TMPFS_NODE_UNLOCK(fdnode);
950 }
951 }
952
953 /* Do the move: just remove the entry from the source directory
954 * and insert it into the target one. */
955 tmpfs_dir_detach(fdvp, de);
956
957 if (fcnp->cn_flags & DOWHITEOUT)
958 tmpfs_dir_whiteout_add(fdvp, fcnp);
959 if (tcnp->cn_flags & ISWHITEOUT)
960 tmpfs_dir_whiteout_remove(tdvp, tcnp);
961
962 /* If the name has changed, we need to make it effective by changing
963 * it in the directory entry. */
964 if (newname != NULL) {
965 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
966
967 free(de->ud.td_name, M_TMPFSNAME);
968 de->ud.td_name = newname;
969 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
970
971 fnode->tn_status |= TMPFS_NODE_CHANGED;
972 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
973 }
974
975 /* If we are overwriting an entry, we have to remove the old one
976 * from the target directory. */
977 if (tvp != NULL) {
978 struct tmpfs_dirent *tde;
979
980 /* Remove the old entry from the target directory. */
981 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
982 tmpfs_dir_detach(tdvp, tde);
983
984 /* Free the directory entry we just deleted. Note that the
985 * node referred by it will not be removed until the vnode is
986 * really reclaimed. */
987 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
988 }
989
990 tmpfs_dir_attach(tdvp, de);
991
992 cache_purge(fvp);
993 if (tvp != NULL)
994 cache_purge(tvp);
995 cache_purge_negative(tdvp);
996
997 error = 0;
998
999 out_locked:
1000 if (fdvp != tdvp && fdvp != tvp)
1001 VOP_UNLOCK(fdvp, 0);
1002
1003 out:
1004 /* Release target nodes. */
1005 /* XXX: I don't understand when tdvp can be the same as tvp, but
1006 * other code takes care of this... */
1007 if (tdvp == tvp)
1008 vrele(tdvp);
1009 else
1010 vput(tdvp);
1011 if (tvp != NULL)
1012 vput(tvp);
1013
1014 /* Release source nodes. */
1015 vrele(fdvp);
1016 vrele(fvp);
1017
1018 if (mp != NULL)
1019 vfs_unbusy(mp);
1020
1021 return error;
1022 }
1023
1024 static int
tmpfs_mkdir(struct vop_mkdir_args * v)1025 tmpfs_mkdir(struct vop_mkdir_args *v)
1026 {
1027 struct vnode *dvp = v->a_dvp;
1028 struct vnode **vpp = v->a_vpp;
1029 struct componentname *cnp = v->a_cnp;
1030 struct vattr *vap = v->a_vap;
1031
1032 MPASS(vap->va_type == VDIR);
1033
1034 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1035 }
1036
1037 static int
tmpfs_rmdir(struct vop_rmdir_args * v)1038 tmpfs_rmdir(struct vop_rmdir_args *v)
1039 {
1040 struct vnode *dvp = v->a_dvp;
1041 struct vnode *vp = v->a_vp;
1042
1043 int error;
1044 struct tmpfs_dirent *de;
1045 struct tmpfs_mount *tmp;
1046 struct tmpfs_node *dnode;
1047 struct tmpfs_node *node;
1048
1049 MPASS(VOP_ISLOCKED(dvp));
1050 MPASS(VOP_ISLOCKED(vp));
1051
1052 tmp = VFS_TO_TMPFS(dvp->v_mount);
1053 dnode = VP_TO_TMPFS_DIR(dvp);
1054 node = VP_TO_TMPFS_DIR(vp);
1055
1056 /* Directories with more than two entries ('.' and '..') cannot be
1057 * removed. */
1058 if (node->tn_size > 0) {
1059 error = ENOTEMPTY;
1060 goto out;
1061 }
1062
1063 if ((dnode->tn_flags & APPEND)
1064 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1065 error = EPERM;
1066 goto out;
1067 }
1068
1069 /* This invariant holds only if we are not trying to remove "..".
1070 * We checked for that above so this is safe now. */
1071 MPASS(node->tn_dir.tn_parent == dnode);
1072
1073 /* Get the directory entry associated with node (vp). This was
1074 * filled by tmpfs_lookup while looking up the entry. */
1075 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1076 MPASS(TMPFS_DIRENT_MATCHES(de,
1077 v->a_cnp->cn_nameptr,
1078 v->a_cnp->cn_namelen));
1079
1080 /* Check flags to see if we are allowed to remove the directory. */
1081 if (dnode->tn_flags & APPEND
1082 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1083 error = EPERM;
1084 goto out;
1085 }
1086
1087
1088 /* Detach the directory entry from the directory (dnode). */
1089 tmpfs_dir_detach(dvp, de);
1090 if (v->a_cnp->cn_flags & DOWHITEOUT)
1091 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1092
1093 /* No vnode should be allocated for this entry from this point */
1094 TMPFS_NODE_LOCK(node);
1095 TMPFS_ASSERT_ELOCKED(node);
1096 node->tn_links--;
1097 node->tn_dir.tn_parent = NULL;
1098 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1099 TMPFS_NODE_MODIFIED;
1100
1101 TMPFS_NODE_UNLOCK(node);
1102
1103 TMPFS_NODE_LOCK(dnode);
1104 TMPFS_ASSERT_ELOCKED(dnode);
1105 dnode->tn_links--;
1106 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1107 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1108 TMPFS_NODE_UNLOCK(dnode);
1109
1110 cache_purge(dvp);
1111 cache_purge(vp);
1112
1113 /* Free the directory entry we just deleted. Note that the node
1114 * referred by it will not be removed until the vnode is really
1115 * reclaimed. */
1116 tmpfs_free_dirent(tmp, de);
1117
1118 /* Release the deleted vnode (will destroy the node, notify
1119 * interested parties and clean it from the cache). */
1120
1121 dnode->tn_status |= TMPFS_NODE_CHANGED;
1122 tmpfs_update(dvp);
1123
1124 error = 0;
1125
1126 out:
1127 return error;
1128 }
1129
1130 static int
tmpfs_symlink(struct vop_symlink_args * v)1131 tmpfs_symlink(struct vop_symlink_args *v)
1132 {
1133 struct vnode *dvp = v->a_dvp;
1134 struct vnode **vpp = v->a_vpp;
1135 struct componentname *cnp = v->a_cnp;
1136 struct vattr *vap = v->a_vap;
1137 char *target = v->a_target;
1138
1139 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1140 MPASS(vap->va_type == VLNK);
1141 #else
1142 vap->va_type = VLNK;
1143 #endif
1144
1145 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1146 }
1147
1148 static int
tmpfs_readdir(struct vop_readdir_args * v)1149 tmpfs_readdir(struct vop_readdir_args *v)
1150 {
1151 struct vnode *vp = v->a_vp;
1152 struct uio *uio = v->a_uio;
1153 int *eofflag = v->a_eofflag;
1154 u_long **cookies = v->a_cookies;
1155 int *ncookies = v->a_ncookies;
1156
1157 int error;
1158 ssize_t startresid;
1159 int maxcookies;
1160 struct tmpfs_node *node;
1161
1162 /* This operation only makes sense on directory nodes. */
1163 if (vp->v_type != VDIR)
1164 return ENOTDIR;
1165
1166 maxcookies = 0;
1167 node = VP_TO_TMPFS_DIR(vp);
1168
1169 startresid = uio->uio_resid;
1170
1171 /* Allocate cookies for NFS and compat modules. */
1172 if (cookies != NULL && ncookies != NULL) {
1173 maxcookies = howmany(node->tn_size,
1174 sizeof(struct tmpfs_dirent)) + 2;
1175 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
1176 M_WAITOK);
1177 *ncookies = 0;
1178 }
1179
1180 if (cookies == NULL)
1181 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
1182 else
1183 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies,
1184 ncookies);
1185
1186 /* Buffer was filled without hitting EOF. */
1187 if (error == EJUSTRETURN)
1188 error = (uio->uio_resid != startresid) ? 0 : EINVAL;
1189
1190 if (error != 0 && cookies != NULL)
1191 free(*cookies, M_TEMP);
1192
1193 if (eofflag != NULL)
1194 *eofflag =
1195 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1196
1197 return error;
1198 }
1199
1200 static int
tmpfs_readlink(struct vop_readlink_args * v)1201 tmpfs_readlink(struct vop_readlink_args *v)
1202 {
1203 struct vnode *vp = v->a_vp;
1204 struct uio *uio = v->a_uio;
1205
1206 int error;
1207 struct tmpfs_node *node;
1208
1209 MPASS(uio->uio_offset == 0);
1210 MPASS(vp->v_type == VLNK);
1211
1212 node = VP_TO_TMPFS_NODE(vp);
1213
1214 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1215 uio);
1216 node->tn_status |= TMPFS_NODE_ACCESSED;
1217
1218 return error;
1219 }
1220
1221 static int
tmpfs_inactive(struct vop_inactive_args * v)1222 tmpfs_inactive(struct vop_inactive_args *v)
1223 {
1224 struct vnode *vp;
1225 struct tmpfs_node *node;
1226
1227 vp = v->a_vp;
1228 node = VP_TO_TMPFS_NODE(vp);
1229 if (node->tn_links == 0)
1230 vrecycle(vp);
1231 else
1232 tmpfs_check_mtime(vp);
1233 return (0);
1234 }
1235
1236 int
tmpfs_reclaim(struct vop_reclaim_args * v)1237 tmpfs_reclaim(struct vop_reclaim_args *v)
1238 {
1239 struct vnode *vp = v->a_vp;
1240
1241 struct tmpfs_mount *tmp;
1242 struct tmpfs_node *node;
1243
1244 node = VP_TO_TMPFS_NODE(vp);
1245 tmp = VFS_TO_TMPFS(vp->v_mount);
1246
1247 if (vp->v_type == VREG)
1248 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
1249 else
1250 vnode_destroy_vobject(vp);
1251 vp->v_object = NULL;
1252 cache_purge(vp);
1253
1254 TMPFS_NODE_LOCK(node);
1255 TMPFS_ASSERT_ELOCKED(node);
1256 tmpfs_free_vp(vp);
1257
1258 /* If the node referenced by this vnode was deleted by the user,
1259 * we must free its associated data structures (now that the vnode
1260 * is being reclaimed). */
1261 if (node->tn_links == 0 &&
1262 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1263 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1264 TMPFS_NODE_UNLOCK(node);
1265 tmpfs_free_node(tmp, node);
1266 } else
1267 TMPFS_NODE_UNLOCK(node);
1268
1269 MPASS(vp->v_data == NULL);
1270 return 0;
1271 }
1272
1273 static int
tmpfs_print(struct vop_print_args * v)1274 tmpfs_print(struct vop_print_args *v)
1275 {
1276 struct vnode *vp = v->a_vp;
1277
1278 struct tmpfs_node *node;
1279
1280 node = VP_TO_TMPFS_NODE(vp);
1281
1282 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n",
1283 node, node->tn_flags, node->tn_links);
1284 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
1285 node->tn_mode, node->tn_uid, node->tn_gid,
1286 (intmax_t)node->tn_size, node->tn_status);
1287
1288 if (vp->v_type == VFIFO)
1289 fifo_printinfo(vp);
1290
1291 printf("\n");
1292
1293 return 0;
1294 }
1295
1296 static int
tmpfs_pathconf(struct vop_pathconf_args * v)1297 tmpfs_pathconf(struct vop_pathconf_args *v)
1298 {
1299 int name = v->a_name;
1300 register_t *retval = v->a_retval;
1301
1302 int error;
1303
1304 error = 0;
1305
1306 switch (name) {
1307 case _PC_LINK_MAX:
1308 *retval = LINK_MAX;
1309 break;
1310
1311 case _PC_NAME_MAX:
1312 *retval = NAME_MAX;
1313 break;
1314
1315 case _PC_PATH_MAX:
1316 *retval = PATH_MAX;
1317 break;
1318
1319 case _PC_PIPE_BUF:
1320 *retval = PIPE_BUF;
1321 break;
1322
1323 case _PC_CHOWN_RESTRICTED:
1324 *retval = 1;
1325 break;
1326
1327 case _PC_NO_TRUNC:
1328 *retval = 1;
1329 break;
1330
1331 case _PC_SYNC_IO:
1332 *retval = 1;
1333 break;
1334
1335 case _PC_FILESIZEBITS:
1336 *retval = 0; /* XXX Don't know which value should I return. */
1337 break;
1338
1339 default:
1340 error = EINVAL;
1341 }
1342
1343 return error;
1344 }
1345
1346 static int
tmpfs_vptofh(struct vop_vptofh_args * ap)1347 tmpfs_vptofh(struct vop_vptofh_args *ap)
1348 {
1349 struct tmpfs_fid *tfhp;
1350 struct tmpfs_node *node;
1351
1352 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1353 node = VP_TO_TMPFS_NODE(ap->a_vp);
1354
1355 tfhp->tf_len = sizeof(struct tmpfs_fid);
1356 tfhp->tf_id = node->tn_id;
1357 tfhp->tf_gen = node->tn_gen;
1358
1359 return (0);
1360 }
1361
1362 static int
tmpfs_whiteout(struct vop_whiteout_args * ap)1363 tmpfs_whiteout(struct vop_whiteout_args *ap)
1364 {
1365 struct vnode *dvp = ap->a_dvp;
1366 struct componentname *cnp = ap->a_cnp;
1367 struct tmpfs_dirent *de;
1368
1369 switch (ap->a_flags) {
1370 case LOOKUP:
1371 return (0);
1372 case CREATE:
1373 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1374 if (de != NULL)
1375 return (de->td_node == NULL ? 0 : EEXIST);
1376 return (tmpfs_dir_whiteout_add(dvp, cnp));
1377 case DELETE:
1378 tmpfs_dir_whiteout_remove(dvp, cnp);
1379 return (0);
1380 default:
1381 panic("tmpfs_whiteout: unknown op");
1382 }
1383 }
1384
1385 /*
1386 * vnode operations vector used for files stored in a tmpfs file system.
1387 */
1388 struct vop_vector tmpfs_vnodeop_entries = {
1389 .vop_default = &default_vnodeops,
1390 .vop_lookup = vfs_cache_lookup,
1391 .vop_cachedlookup = tmpfs_lookup,
1392 .vop_create = tmpfs_create,
1393 .vop_mknod = tmpfs_mknod,
1394 .vop_open = tmpfs_open,
1395 .vop_close = tmpfs_close,
1396 .vop_access = tmpfs_access,
1397 .vop_getattr = tmpfs_getattr,
1398 .vop_setattr = tmpfs_setattr,
1399 .vop_read = tmpfs_read,
1400 .vop_write = tmpfs_write,
1401 .vop_fsync = tmpfs_fsync,
1402 .vop_remove = tmpfs_remove,
1403 .vop_link = tmpfs_link,
1404 .vop_rename = tmpfs_rename,
1405 .vop_mkdir = tmpfs_mkdir,
1406 .vop_rmdir = tmpfs_rmdir,
1407 .vop_symlink = tmpfs_symlink,
1408 .vop_readdir = tmpfs_readdir,
1409 .vop_readlink = tmpfs_readlink,
1410 .vop_inactive = tmpfs_inactive,
1411 .vop_reclaim = tmpfs_reclaim,
1412 .vop_print = tmpfs_print,
1413 .vop_pathconf = tmpfs_pathconf,
1414 .vop_vptofh = tmpfs_vptofh,
1415 .vop_whiteout = tmpfs_whiteout,
1416 .vop_bmap = VOP_EOPNOTSUPP,
1417 };
1418
1419