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: stable/10/sys/fs/tmpfs/tmpfs_vnops.c 313094 2017-02-02 13:38:01Z kib $");
|
| 37__FBSDID("$FreeBSD: stable/10/sys/fs/tmpfs/tmpfs_vnops.c 313095 2017-02-02 13:39:11Z kib $"); |
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
63SYSCTL_DECL(_vfs_tmpfs);
64
65static volatile int tmpfs_rename_restarts;
66SYSCTL_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
70static int
71tmpfs_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
78static int
|
79tmpfs_lookup(struct vop_cachedlookup_args *v)
|
| 79tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp) |
80{
|
81 struct vnode *dvp = v->a_dvp;
82 struct vnode **vpp = v->a_vpp;
83 struct componentname *cnp = v->a_cnp;
|
81 struct tmpfs_dirent *de;
82 struct tmpfs_node *dnode, *pnode;
83 struct tmpfs_mount *tm;
84 int error;
85
86 dnode = VP_TO_TMPFS_DIR(dvp);
87 *vpp = NULLVP;
88
89 /* Check accessibility of requested node as a first step. */
90 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
91 if (error != 0)
92 goto out;
93
94 /* We cannot be requesting the parent directory of the root node. */
95 MPASS(IMPLIES(dnode->tn_type == VDIR &&
96 dnode->tn_dir.tn_parent == dnode,
97 !(cnp->cn_flags & ISDOTDOT)));
98
99 TMPFS_ASSERT_LOCKED(dnode);
100 if (dnode->tn_dir.tn_parent == NULL) {
101 error = ENOENT;
102 goto out;
103 }
104 if (cnp->cn_flags & ISDOTDOT) {
105 tm = VFS_TO_TMPFS(dvp->v_mount);
106 pnode = dnode->tn_dir.tn_parent;
107 tmpfs_ref_node(pnode);
108 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
109 pnode, cnp->cn_lkflags, vpp);
110 tmpfs_free_node(tm, pnode);
111 if (error != 0)
112 goto out;
113 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
114 VREF(dvp);
115 *vpp = dvp;
116 error = 0;
117 } else {
118 de = tmpfs_dir_lookup(dnode, NULL, cnp);
119 if (de != NULL && de->td_node == NULL)
120 cnp->cn_flags |= ISWHITEOUT;
121 if (de == NULL || de->td_node == NULL) {
122 /*
123 * The entry was not found in the directory.
124 * This is OK if we are creating or renaming an
125 * entry and are working on the last component of
126 * the path name.
127 */
128 if ((cnp->cn_flags & ISLASTCN) &&
129 (cnp->cn_nameiop == CREATE || \
130 cnp->cn_nameiop == RENAME ||
131 (cnp->cn_nameiop == DELETE &&
132 cnp->cn_flags & DOWHITEOUT &&
133 cnp->cn_flags & ISWHITEOUT))) {
134 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
135 cnp->cn_thread);
136 if (error != 0)
137 goto out;
138
139 /*
140 * Keep the component name in the buffer for
141 * future uses.
142 */
143 cnp->cn_flags |= SAVENAME;
144
145 error = EJUSTRETURN;
146 } else
147 error = ENOENT;
148 } else {
149 struct tmpfs_node *tnode;
150
151 /*
152 * The entry was found, so get its associated
153 * tmpfs_node.
154 */
155 tnode = de->td_node;
156
157 /*
158 * If we are not at the last path component and
159 * found a non-directory or non-link entry (which
160 * may itself be pointing to a directory), raise
161 * an error.
162 */
163 if ((tnode->tn_type != VDIR &&
164 tnode->tn_type != VLNK) &&
165 !(cnp->cn_flags & ISLASTCN)) {
166 error = ENOTDIR;
167 goto out;
168 }
169
170 /*
171 * If we are deleting or renaming the entry, keep
172 * track of its tmpfs_dirent so that it can be
173 * easily deleted later.
174 */
175 if ((cnp->cn_flags & ISLASTCN) &&
176 (cnp->cn_nameiop == DELETE ||
177 cnp->cn_nameiop == RENAME)) {
178 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
179 cnp->cn_thread);
180 if (error != 0)
181 goto out;
182
183 /* Allocate a new vnode on the matching entry. */
184 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
185 cnp->cn_lkflags, vpp);
186 if (error != 0)
187 goto out;
188
189 if ((dnode->tn_mode & S_ISTXT) &&
190 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred,
191 cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN,
192 cnp->cn_cred, cnp->cn_thread)) {
193 error = EPERM;
194 vput(*vpp);
195 *vpp = NULL;
196 goto out;
197 }
198 cnp->cn_flags |= SAVENAME;
199 } else {
200 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
201 cnp->cn_lkflags, vpp);
202 if (error != 0)
203 goto out;
204 }
205 }
206 }
207
208 /*
209 * Store the result of this lookup in the cache. Avoid this if the
210 * request was for creation, as it does not improve timings on
211 * emprical tests.
212 */
|
216 if ((cnp->cn_flags & MAKEENTRY) != 0)
|
| 213 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) |
214 cache_enter(dvp, *vpp, cnp);
215
216out:
217 /*
218 * If there were no errors, *vpp cannot be null and it must be
219 * locked.
220 */
221 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
222
223 return (error);
224}
225
226static int
|
227tmpfs_cached_lookup(struct vop_cachedlookup_args *v)
228{
229
230 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp));
231}
232
233static int
234tmpfs_lookup(struct vop_lookup_args *v)
235{
236
237 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp));
238}
239
240static int |
241tmpfs_create(struct vop_create_args *v)
242{
243 struct vnode *dvp = v->a_dvp;
244 struct vnode **vpp = v->a_vpp;
245 struct componentname *cnp = v->a_cnp;
246 struct vattr *vap = v->a_vap;
247 int error;
248
249 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
250
251 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
|
241 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0)
|
| 252 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp)) |
253 cache_enter(dvp, *vpp, cnp);
254 return (error);
255}
256
257static int
258tmpfs_mknod(struct vop_mknod_args *v)
259{
260 struct vnode *dvp = v->a_dvp;
261 struct vnode **vpp = v->a_vpp;
262 struct componentname *cnp = v->a_cnp;
263 struct vattr *vap = v->a_vap;
264
265 if (vap->va_type != VBLK && vap->va_type != VCHR &&
266 vap->va_type != VFIFO)
267 return EINVAL;
268
269 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
270}
271
272static int
273tmpfs_open(struct vop_open_args *v)
274{
275 struct vnode *vp = v->a_vp;
276 int mode = v->a_mode;
277
278 int error;
279 struct tmpfs_node *node;
280
281 MPASS(VOP_ISLOCKED(vp));
282
283 node = VP_TO_TMPFS_NODE(vp);
284
285 /* The file is still active but all its names have been removed
286 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
287 * it is about to die. */
288 if (node->tn_links < 1)
289 return (ENOENT);
290
291 /* If the file is marked append-only, deny write requests. */
292 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
293 error = EPERM;
294 else {
295 error = 0;
296 /* For regular files, the call below is nop. */
297 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags &
298 OBJ_DEAD) == 0, ("dead object"));
299 vnode_create_vobject(vp, node->tn_size, v->a_td);
300 }
301
302 MPASS(VOP_ISLOCKED(vp));
303 return error;
304}
305
306static int
307tmpfs_close(struct vop_close_args *v)
308{
309 struct vnode *vp = v->a_vp;
310
311 /* Update node times. */
312 tmpfs_update(vp);
313
314 return (0);
315}
316
317int
318tmpfs_access(struct vop_access_args *v)
319{
320 struct vnode *vp = v->a_vp;
321 accmode_t accmode = v->a_accmode;
322 struct ucred *cred = v->a_cred;
323
324 int error;
325 struct tmpfs_node *node;
326
327 MPASS(VOP_ISLOCKED(vp));
328
329 node = VP_TO_TMPFS_NODE(vp);
330
331 switch (vp->v_type) {
332 case VDIR:
333 /* FALLTHROUGH */
334 case VLNK:
335 /* FALLTHROUGH */
336 case VREG:
337 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
338 error = EROFS;
339 goto out;
340 }
341 break;
342
343 case VBLK:
344 /* FALLTHROUGH */
345 case VCHR:
346 /* FALLTHROUGH */
347 case VSOCK:
348 /* FALLTHROUGH */
349 case VFIFO:
350 break;
351
352 default:
353 error = EINVAL;
354 goto out;
355 }
356
357 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
358 error = EPERM;
359 goto out;
360 }
361
362 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
363 node->tn_gid, accmode, cred, NULL);
364
365out:
366 MPASS(VOP_ISLOCKED(vp));
367
368 return error;
369}
370
371int
372tmpfs_getattr(struct vop_getattr_args *v)
373{
374 struct vnode *vp = v->a_vp;
375 struct vattr *vap = v->a_vap;
376
377 struct tmpfs_node *node;
378
379 node = VP_TO_TMPFS_NODE(vp);
380
381 tmpfs_update(vp);
382
383 vap->va_type = vp->v_type;
384 vap->va_mode = node->tn_mode;
385 vap->va_nlink = node->tn_links;
386 vap->va_uid = node->tn_uid;
387 vap->va_gid = node->tn_gid;
388 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
389 vap->va_fileid = node->tn_id;
390 vap->va_size = node->tn_size;
391 vap->va_blocksize = PAGE_SIZE;
392 vap->va_atime = node->tn_atime;
393 vap->va_mtime = node->tn_mtime;
394 vap->va_ctime = node->tn_ctime;
395 vap->va_birthtime = node->tn_birthtime;
396 vap->va_gen = node->tn_gen;
397 vap->va_flags = node->tn_flags;
398 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
399 node->tn_rdev : NODEV;
400 vap->va_bytes = round_page(node->tn_size);
401 vap->va_filerev = 0;
402
403 return 0;
404}
405
406int
407tmpfs_setattr(struct vop_setattr_args *v)
408{
409 struct vnode *vp = v->a_vp;
410 struct vattr *vap = v->a_vap;
411 struct ucred *cred = v->a_cred;
412 struct thread *td = curthread;
413
414 int error;
415
416 MPASS(VOP_ISLOCKED(vp));
417
418 error = 0;
419
420 /* Abort if any unsettable attribute is given. */
421 if (vap->va_type != VNON ||
422 vap->va_nlink != VNOVAL ||
423 vap->va_fsid != VNOVAL ||
424 vap->va_fileid != VNOVAL ||
425 vap->va_blocksize != VNOVAL ||
426 vap->va_gen != VNOVAL ||
427 vap->va_rdev != VNOVAL ||
428 vap->va_bytes != VNOVAL)
429 error = EINVAL;
430
431 if (error == 0 && (vap->va_flags != VNOVAL))
432 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
433
434 if (error == 0 && (vap->va_size != VNOVAL))
435 error = tmpfs_chsize(vp, vap->va_size, cred, td);
436
437 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
438 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
439
440 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
441 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
442
443 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
444 vap->va_atime.tv_nsec != VNOVAL) ||
445 (vap->va_mtime.tv_sec != VNOVAL &&
446 vap->va_mtime.tv_nsec != VNOVAL) ||
447 (vap->va_birthtime.tv_sec != VNOVAL &&
448 vap->va_birthtime.tv_nsec != VNOVAL)))
449 error = tmpfs_chtimes(vp, vap, cred, td);
450
451 /* Update the node times. We give preference to the error codes
452 * generated by this function rather than the ones that may arise
453 * from tmpfs_update. */
454 tmpfs_update(vp);
455
456 MPASS(VOP_ISLOCKED(vp));
457
458 return error;
459}
460
461static int
462tmpfs_read(struct vop_read_args *v)
463{
464 struct vnode *vp;
465 struct uio *uio;
466 struct tmpfs_node *node;
467
468 vp = v->a_vp;
469 if (vp->v_type != VREG)
470 return (EISDIR);
471 uio = v->a_uio;
472 if (uio->uio_offset < 0)
473 return (EINVAL);
474 node = VP_TO_TMPFS_NODE(vp);
475 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
476 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
477}
478
479static int
480tmpfs_write(struct vop_write_args *v)
481{
482 struct vnode *vp;
483 struct uio *uio;
484 struct tmpfs_node *node;
485 off_t oldsize;
486 int error, ioflag;
487
488 vp = v->a_vp;
489 uio = v->a_uio;
490 ioflag = v->a_ioflag;
491 error = 0;
492 node = VP_TO_TMPFS_NODE(vp);
493 oldsize = node->tn_size;
494
495 if (uio->uio_offset < 0 || vp->v_type != VREG)
496 return (EINVAL);
497 if (uio->uio_resid == 0)
498 return (0);
499 if (ioflag & IO_APPEND)
500 uio->uio_offset = node->tn_size;
501 if (uio->uio_offset + uio->uio_resid >
502 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
503 return (EFBIG);
504 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
505 return (EFBIG);
506 if (uio->uio_offset + uio->uio_resid > node->tn_size) {
507 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
508 FALSE);
509 if (error != 0)
510 goto out;
511 }
512
513 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
514 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
515 TMPFS_NODE_CHANGED;
516 if (node->tn_mode & (S_ISUID | S_ISGID)) {
517 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
518 node->tn_mode &= ~(S_ISUID | S_ISGID);
519 }
520 if (error != 0)
521 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
522
523out:
524 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
525 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
526
527 return (error);
528}
529
530static int
531tmpfs_fsync(struct vop_fsync_args *v)
532{
533 struct vnode *vp = v->a_vp;
534
535 MPASS(VOP_ISLOCKED(vp));
536
537 tmpfs_check_mtime(vp);
538 tmpfs_update(vp);
539
540 return 0;
541}
542
543static int
544tmpfs_remove(struct vop_remove_args *v)
545{
546 struct vnode *dvp = v->a_dvp;
547 struct vnode *vp = v->a_vp;
548
549 int error;
550 struct tmpfs_dirent *de;
551 struct tmpfs_mount *tmp;
552 struct tmpfs_node *dnode;
553 struct tmpfs_node *node;
554
555 MPASS(VOP_ISLOCKED(dvp));
556 MPASS(VOP_ISLOCKED(vp));
557
558 if (vp->v_type == VDIR) {
559 error = EISDIR;
560 goto out;
561 }
562
563 dnode = VP_TO_TMPFS_DIR(dvp);
564 node = VP_TO_TMPFS_NODE(vp);
565 tmp = VFS_TO_TMPFS(vp->v_mount);
566 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
567 MPASS(de != NULL);
568
569 /* Files marked as immutable or append-only cannot be deleted. */
570 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
571 (dnode->tn_flags & APPEND)) {
572 error = EPERM;
573 goto out;
574 }
575
576 /* Remove the entry from the directory; as it is a file, we do not
577 * have to change the number of hard links of the directory. */
578 tmpfs_dir_detach(dvp, de);
579 if (v->a_cnp->cn_flags & DOWHITEOUT)
580 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
581
582 /* Free the directory entry we just deleted. Note that the node
583 * referred by it will not be removed until the vnode is really
584 * reclaimed. */
585 tmpfs_free_dirent(tmp, de);
586
587 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
588 error = 0;
589
590out:
591
592 return error;
593}
594
595static int
596tmpfs_link(struct vop_link_args *v)
597{
598 struct vnode *dvp = v->a_tdvp;
599 struct vnode *vp = v->a_vp;
600 struct componentname *cnp = v->a_cnp;
601
602 int error;
603 struct tmpfs_dirent *de;
604 struct tmpfs_node *node;
605
606 MPASS(VOP_ISLOCKED(dvp));
607 MPASS(cnp->cn_flags & HASBUF);
608 MPASS(dvp != vp); /* XXX When can this be false? */
609 node = VP_TO_TMPFS_NODE(vp);
610
611 /* Ensure that we do not overflow the maximum number of links imposed
612 * by the system. */
613 MPASS(node->tn_links <= LINK_MAX);
614 if (node->tn_links == LINK_MAX) {
615 error = EMLINK;
616 goto out;
617 }
618
619 /* We cannot create links of files marked immutable or append-only. */
620 if (node->tn_flags & (IMMUTABLE | APPEND)) {
621 error = EPERM;
622 goto out;
623 }
624
625 /* Allocate a new directory entry to represent the node. */
626 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
627 cnp->cn_nameptr, cnp->cn_namelen, &de);
628 if (error != 0)
629 goto out;
630
631 /* Insert the new directory entry into the appropriate directory. */
632 if (cnp->cn_flags & ISWHITEOUT)
633 tmpfs_dir_whiteout_remove(dvp, cnp);
634 tmpfs_dir_attach(dvp, de);
635
636 /* vp link count has changed, so update node times. */
637 node->tn_status |= TMPFS_NODE_CHANGED;
638 tmpfs_update(vp);
639
640 error = 0;
641
642out:
643 return error;
644}
645
646/*
647 * We acquire all but fdvp locks using non-blocking acquisitions. If we
648 * fail to acquire any lock in the path we will drop all held locks,
649 * acquire the new lock in a blocking fashion, and then release it and
650 * restart the rename. This acquire/release step ensures that we do not
651 * spin on a lock waiting for release. On error release all vnode locks
652 * and decrement references the way tmpfs_rename() would do.
653 */
654static int
655tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
656 struct vnode *tdvp, struct vnode **tvpp,
657 struct componentname *fcnp, struct componentname *tcnp)
658{
659 struct vnode *nvp;
660 struct mount *mp;
661 struct tmpfs_dirent *de;
662 int error, restarts = 0;
663
664 VOP_UNLOCK(tdvp, 0);
665 if (*tvpp != NULL && *tvpp != tdvp)
666 VOP_UNLOCK(*tvpp, 0);
667 mp = fdvp->v_mount;
668
669relock:
670 restarts += 1;
671 error = vn_lock(fdvp, LK_EXCLUSIVE);
672 if (error)
673 goto releout;
674 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
675 VOP_UNLOCK(fdvp, 0);
676 error = vn_lock(tdvp, LK_EXCLUSIVE);
677 if (error)
678 goto releout;
679 VOP_UNLOCK(tdvp, 0);
680 goto relock;
681 }
682 /*
683 * Re-resolve fvp to be certain it still exists and fetch the
684 * correct vnode.
685 */
686 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
687 if (de == NULL) {
688 VOP_UNLOCK(fdvp, 0);
689 VOP_UNLOCK(tdvp, 0);
690 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
691 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
692 error = EINVAL;
693 else
694 error = ENOENT;
695 goto releout;
696 }
697 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
698 if (error != 0) {
699 VOP_UNLOCK(fdvp, 0);
700 VOP_UNLOCK(tdvp, 0);
701 if (error != EBUSY)
702 goto releout;
703 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
704 if (error != 0)
705 goto releout;
706 VOP_UNLOCK(nvp, 0);
707 /*
708 * Concurrent rename race.
709 */
710 if (nvp == tdvp) {
711 vrele(nvp);
712 error = EINVAL;
713 goto releout;
714 }
715 vrele(*fvpp);
716 *fvpp = nvp;
717 goto relock;
718 }
719 vrele(*fvpp);
720 *fvpp = nvp;
721 VOP_UNLOCK(*fvpp, 0);
722 /*
723 * Re-resolve tvp and acquire the vnode lock if present.
724 */
725 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
726 /*
727 * If tvp disappeared we just carry on.
728 */
729 if (de == NULL && *tvpp != NULL) {
730 vrele(*tvpp);
731 *tvpp = NULL;
732 }
733 /*
734 * Get the tvp ino if the lookup succeeded. We may have to restart
735 * if the non-blocking acquire fails.
736 */
737 if (de != NULL) {
738 nvp = NULL;
739 error = tmpfs_alloc_vp(mp, de->td_node,
740 LK_EXCLUSIVE | LK_NOWAIT, &nvp);
741 if (*tvpp != NULL)
742 vrele(*tvpp);
743 *tvpp = nvp;
744 if (error != 0) {
745 VOP_UNLOCK(fdvp, 0);
746 VOP_UNLOCK(tdvp, 0);
747 if (error != EBUSY)
748 goto releout;
749 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
750 &nvp);
751 if (error != 0)
752 goto releout;
753 VOP_UNLOCK(nvp, 0);
754 /*
755 * fdvp contains fvp, thus tvp (=fdvp) is not empty.
756 */
757 if (nvp == fdvp) {
758 error = ENOTEMPTY;
759 goto releout;
760 }
761 goto relock;
762 }
763 }
764 tmpfs_rename_restarts += restarts;
765
766 return (0);
767
768releout:
769 vrele(fdvp);
770 vrele(*fvpp);
771 vrele(tdvp);
772 if (*tvpp != NULL)
773 vrele(*tvpp);
774 tmpfs_rename_restarts += restarts;
775
776 return (error);
777}
778
779static int
780tmpfs_rename(struct vop_rename_args *v)
781{
782 struct vnode *fdvp = v->a_fdvp;
783 struct vnode *fvp = v->a_fvp;
784 struct componentname *fcnp = v->a_fcnp;
785 struct vnode *tdvp = v->a_tdvp;
786 struct vnode *tvp = v->a_tvp;
787 struct componentname *tcnp = v->a_tcnp;
788 struct mount *mp = NULL;
789
790 char *newname;
791 int error;
792 struct tmpfs_dirent *de;
793 struct tmpfs_mount *tmp;
794 struct tmpfs_node *fdnode;
795 struct tmpfs_node *fnode;
796 struct tmpfs_node *tnode;
797 struct tmpfs_node *tdnode;
798
799 MPASS(VOP_ISLOCKED(tdvp));
800 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
801 MPASS(fcnp->cn_flags & HASBUF);
802 MPASS(tcnp->cn_flags & HASBUF);
803
804 /* Disallow cross-device renames.
805 * XXX Why isn't this done by the caller? */
806 if (fvp->v_mount != tdvp->v_mount ||
807 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
808 error = EXDEV;
809 goto out;
810 }
811
812 /* If source and target are the same file, there is nothing to do. */
813 if (fvp == tvp) {
814 error = 0;
815 goto out;
816 }
817
818 /* If we need to move the directory between entries, lock the
819 * source so that we can safely operate on it. */
820 if (fdvp != tdvp && fdvp != tvp) {
821 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
822 mp = tdvp->v_mount;
823 error = vfs_busy(mp, 0);
824 if (error != 0) {
825 mp = NULL;
826 goto out;
827 }
828 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
829 fcnp, tcnp);
830 if (error != 0) {
831 vfs_unbusy(mp);
832 return (error);
833 }
834 ASSERT_VOP_ELOCKED(fdvp,
835 "tmpfs_rename: fdvp not locked");
836 ASSERT_VOP_ELOCKED(tdvp,
837 "tmpfs_rename: tdvp not locked");
838 if (tvp != NULL)
839 ASSERT_VOP_ELOCKED(tvp,
840 "tmpfs_rename: tvp not locked");
841 if (fvp == tvp) {
842 error = 0;
843 goto out_locked;
844 }
845 }
846 }
847
848 tmp = VFS_TO_TMPFS(tdvp->v_mount);
849 tdnode = VP_TO_TMPFS_DIR(tdvp);
850 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
851 fdnode = VP_TO_TMPFS_DIR(fdvp);
852 fnode = VP_TO_TMPFS_NODE(fvp);
853 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
854
855 /* Entry can disappear before we lock fdvp,
856 * also avoid manipulating '.' and '..' entries. */
857 if (de == NULL) {
858 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
859 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
860 error = EINVAL;
861 else
862 error = ENOENT;
863 goto out_locked;
864 }
865 MPASS(de->td_node == fnode);
866
867 /* If re-naming a directory to another preexisting directory
868 * ensure that the target directory is empty so that its
869 * removal causes no side effects.
870 * Kern_rename gurantees the destination to be a directory
871 * if the source is one. */
872 if (tvp != NULL) {
873 MPASS(tnode != NULL);
874
875 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
876 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
877 error = EPERM;
878 goto out_locked;
879 }
880
881 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
882 if (tnode->tn_size > 0) {
883 error = ENOTEMPTY;
884 goto out_locked;
885 }
886 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
887 error = ENOTDIR;
888 goto out_locked;
889 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
890 error = EISDIR;
891 goto out_locked;
892 } else {
893 MPASS(fnode->tn_type != VDIR &&
894 tnode->tn_type != VDIR);
895 }
896 }
897
898 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
899 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
900 error = EPERM;
901 goto out_locked;
902 }
903
904 /* Ensure that we have enough memory to hold the new name, if it
905 * has to be changed. */
906 if (fcnp->cn_namelen != tcnp->cn_namelen ||
907 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
908 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
909 } else
910 newname = NULL;
911
912 /* If the node is being moved to another directory, we have to do
913 * the move. */
914 if (fdnode != tdnode) {
915 /* In case we are moving a directory, we have to adjust its
916 * parent to point to the new parent. */
917 if (de->td_node->tn_type == VDIR) {
918 struct tmpfs_node *n;
919
920 /* Ensure the target directory is not a child of the
921 * directory being moved. Otherwise, we'd end up
922 * with stale nodes. */
923 n = tdnode;
924 /* TMPFS_LOCK garanties that no nodes are freed while
925 * traversing the list. Nodes can only be marked as
926 * removed: tn_parent == NULL. */
927 TMPFS_LOCK(tmp);
928 TMPFS_NODE_LOCK(n);
929 while (n != n->tn_dir.tn_parent) {
930 struct tmpfs_node *parent;
931
932 if (n == fnode) {
933 TMPFS_NODE_UNLOCK(n);
934 TMPFS_UNLOCK(tmp);
935 error = EINVAL;
936 if (newname != NULL)
937 free(newname, M_TMPFSNAME);
938 goto out_locked;
939 }
940 parent = n->tn_dir.tn_parent;
941 TMPFS_NODE_UNLOCK(n);
942 if (parent == NULL) {
943 n = NULL;
944 break;
945 }
946 TMPFS_NODE_LOCK(parent);
947 if (parent->tn_dir.tn_parent == NULL) {
948 TMPFS_NODE_UNLOCK(parent);
949 n = NULL;
950 break;
951 }
952 n = parent;
953 }
954 TMPFS_UNLOCK(tmp);
955 if (n == NULL) {
956 error = EINVAL;
957 if (newname != NULL)
958 free(newname, M_TMPFSNAME);
959 goto out_locked;
960 }
961 TMPFS_NODE_UNLOCK(n);
962
963 /* Adjust the parent pointer. */
964 TMPFS_VALIDATE_DIR(fnode);
965 TMPFS_NODE_LOCK(de->td_node);
966 de->td_node->tn_dir.tn_parent = tdnode;
967 TMPFS_NODE_UNLOCK(de->td_node);
968
969 /* As a result of changing the target of the '..'
970 * entry, the link count of the source and target
971 * directories has to be adjusted. */
972 TMPFS_NODE_LOCK(tdnode);
973 TMPFS_ASSERT_LOCKED(tdnode);
974 tdnode->tn_links++;
975 TMPFS_NODE_UNLOCK(tdnode);
976
977 TMPFS_NODE_LOCK(fdnode);
978 TMPFS_ASSERT_LOCKED(fdnode);
979 fdnode->tn_links--;
980 TMPFS_NODE_UNLOCK(fdnode);
981 }
982 }
983
984 /* Do the move: just remove the entry from the source directory
985 * and insert it into the target one. */
986 tmpfs_dir_detach(fdvp, de);
987
988 if (fcnp->cn_flags & DOWHITEOUT)
989 tmpfs_dir_whiteout_add(fdvp, fcnp);
990 if (tcnp->cn_flags & ISWHITEOUT)
991 tmpfs_dir_whiteout_remove(tdvp, tcnp);
992
993 /* If the name has changed, we need to make it effective by changing
994 * it in the directory entry. */
995 if (newname != NULL) {
996 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
997
998 free(de->ud.td_name, M_TMPFSNAME);
999 de->ud.td_name = newname;
1000 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
1001
1002 fnode->tn_status |= TMPFS_NODE_CHANGED;
1003 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1004 }
1005
1006 /* If we are overwriting an entry, we have to remove the old one
1007 * from the target directory. */
1008 if (tvp != NULL) {
1009 struct tmpfs_dirent *tde;
1010
1011 /* Remove the old entry from the target directory. */
1012 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
1013 tmpfs_dir_detach(tdvp, tde);
1014
1015 /* Free the directory entry we just deleted. Note that the
1016 * node referred by it will not be removed until the vnode is
1017 * really reclaimed. */
1018 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
1019 }
1020
1021 tmpfs_dir_attach(tdvp, de);
1022
|
1012 cache_purge(fvp);
1013 if (tvp != NULL)
1014 cache_purge(tvp);
1015 cache_purge_negative(tdvp);
|
1023 if (tmpfs_use_nc(fvp)) {
1024 cache_purge(fvp);
1025 if (tvp != NULL)
1026 cache_purge(tvp);
1027 cache_purge_negative(tdvp);
1028 } |
1029
1030 error = 0;
1031
1032out_locked:
1033 if (fdvp != tdvp && fdvp != tvp)
1034 VOP_UNLOCK(fdvp, 0);
1035
1036out:
1037 /* Release target nodes. */
1038 /* XXX: I don't understand when tdvp can be the same as tvp, but
1039 * other code takes care of this... */
1040 if (tdvp == tvp)
1041 vrele(tdvp);
1042 else
1043 vput(tdvp);
1044 if (tvp != NULL)
1045 vput(tvp);
1046
1047 /* Release source nodes. */
1048 vrele(fdvp);
1049 vrele(fvp);
1050
1051 if (mp != NULL)
1052 vfs_unbusy(mp);
1053
1054 return error;
1055}
1056
1057static int
1058tmpfs_mkdir(struct vop_mkdir_args *v)
1059{
1060 struct vnode *dvp = v->a_dvp;
1061 struct vnode **vpp = v->a_vpp;
1062 struct componentname *cnp = v->a_cnp;
1063 struct vattr *vap = v->a_vap;
1064
1065 MPASS(vap->va_type == VDIR);
1066
1067 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1068}
1069
1070static int
1071tmpfs_rmdir(struct vop_rmdir_args *v)
1072{
1073 struct vnode *dvp = v->a_dvp;
1074 struct vnode *vp = v->a_vp;
1075
1076 int error;
1077 struct tmpfs_dirent *de;
1078 struct tmpfs_mount *tmp;
1079 struct tmpfs_node *dnode;
1080 struct tmpfs_node *node;
1081
1082 MPASS(VOP_ISLOCKED(dvp));
1083 MPASS(VOP_ISLOCKED(vp));
1084
1085 tmp = VFS_TO_TMPFS(dvp->v_mount);
1086 dnode = VP_TO_TMPFS_DIR(dvp);
1087 node = VP_TO_TMPFS_DIR(vp);
1088
1089 /* Directories with more than two entries ('.' and '..') cannot be
1090 * removed. */
1091 if (node->tn_size > 0) {
1092 error = ENOTEMPTY;
1093 goto out;
1094 }
1095
1096 if ((dnode->tn_flags & APPEND)
1097 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1098 error = EPERM;
1099 goto out;
1100 }
1101
1102 /* This invariant holds only if we are not trying to remove "..".
1103 * We checked for that above so this is safe now. */
1104 MPASS(node->tn_dir.tn_parent == dnode);
1105
1106 /* Get the directory entry associated with node (vp). This was
1107 * filled by tmpfs_lookup while looking up the entry. */
1108 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1109 MPASS(TMPFS_DIRENT_MATCHES(de,
1110 v->a_cnp->cn_nameptr,
1111 v->a_cnp->cn_namelen));
1112
1113 /* Check flags to see if we are allowed to remove the directory. */
1114 if ((dnode->tn_flags & APPEND) != 0 ||
1115 (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) {
1116 error = EPERM;
1117 goto out;
1118 }
1119
1120
1121 /* Detach the directory entry from the directory (dnode). */
1122 tmpfs_dir_detach(dvp, de);
1123 if (v->a_cnp->cn_flags & DOWHITEOUT)
1124 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1125
1126 /* No vnode should be allocated for this entry from this point */
1127 TMPFS_NODE_LOCK(node);
1128 node->tn_links--;
1129 node->tn_dir.tn_parent = NULL;
1130 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
1131 TMPFS_NODE_MODIFIED;
1132
1133 TMPFS_NODE_UNLOCK(node);
1134
1135 TMPFS_NODE_LOCK(dnode);
1136 dnode->tn_links--;
1137 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
1138 TMPFS_NODE_MODIFIED;
1139 TMPFS_NODE_UNLOCK(dnode);
1140
|
1128 cache_purge(dvp);
1129 cache_purge(vp);
|
1141 if (tmpfs_use_nc(dvp)) {
1142 cache_purge(dvp);
1143 cache_purge(vp);
1144 } |
1145
1146 /* Free the directory entry we just deleted. Note that the node
1147 * referred by it will not be removed until the vnode is really
1148 * reclaimed. */
1149 tmpfs_free_dirent(tmp, de);
1150
1151 /* Release the deleted vnode (will destroy the node, notify
1152 * interested parties and clean it from the cache). */
1153
1154 dnode->tn_status |= TMPFS_NODE_CHANGED;
1155 tmpfs_update(dvp);
1156
1157 error = 0;
1158
1159out:
1160 return error;
1161}
1162
1163static int
1164tmpfs_symlink(struct vop_symlink_args *v)
1165{
1166 struct vnode *dvp = v->a_dvp;
1167 struct vnode **vpp = v->a_vpp;
1168 struct componentname *cnp = v->a_cnp;
1169 struct vattr *vap = v->a_vap;
1170 char *target = v->a_target;
1171
1172#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1173 MPASS(vap->va_type == VLNK);
1174#else
1175 vap->va_type = VLNK;
1176#endif
1177
1178 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1179}
1180
1181static int
1182tmpfs_readdir(struct vop_readdir_args *v)
1183{
1184 struct vnode *vp = v->a_vp;
1185 struct uio *uio = v->a_uio;
1186 int *eofflag = v->a_eofflag;
1187 u_long **cookies = v->a_cookies;
1188 int *ncookies = v->a_ncookies;
1189
1190 int error;
1191 ssize_t startresid;
1192 int maxcookies;
1193 struct tmpfs_node *node;
1194
1195 /* This operation only makes sense on directory nodes. */
1196 if (vp->v_type != VDIR)
1197 return ENOTDIR;
1198
1199 maxcookies = 0;
1200 node = VP_TO_TMPFS_DIR(vp);
1201
1202 startresid = uio->uio_resid;
1203
1204 /* Allocate cookies for NFS and compat modules. */
1205 if (cookies != NULL && ncookies != NULL) {
1206 maxcookies = howmany(node->tn_size,
1207 sizeof(struct tmpfs_dirent)) + 2;
1208 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
1209 M_WAITOK);
1210 *ncookies = 0;
1211 }
1212
1213 if (cookies == NULL)
1214 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
1215 else
1216 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies,
1217 ncookies);
1218
1219 /* Buffer was filled without hitting EOF. */
1220 if (error == EJUSTRETURN)
1221 error = (uio->uio_resid != startresid) ? 0 : EINVAL;
1222
1223 if (error != 0 && cookies != NULL && ncookies != NULL) {
1224 free(*cookies, M_TEMP);
1225 *cookies = NULL;
1226 *ncookies = 0;
1227 }
1228
1229 if (eofflag != NULL)
1230 *eofflag =
1231 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1232
1233 return error;
1234}
1235
1236static int
1237tmpfs_readlink(struct vop_readlink_args *v)
1238{
1239 struct vnode *vp = v->a_vp;
1240 struct uio *uio = v->a_uio;
1241
1242 int error;
1243 struct tmpfs_node *node;
1244
1245 MPASS(uio->uio_offset == 0);
1246 MPASS(vp->v_type == VLNK);
1247
1248 node = VP_TO_TMPFS_NODE(vp);
1249
1250 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1251 uio);
1252 tmpfs_set_status(node, TMPFS_NODE_ACCESSED);
1253
1254 return (error);
1255}
1256
1257static int
1258tmpfs_inactive(struct vop_inactive_args *v)
1259{
1260 struct vnode *vp;
1261 struct tmpfs_node *node;
1262
1263 vp = v->a_vp;
1264 node = VP_TO_TMPFS_NODE(vp);
1265 if (node->tn_links == 0)
1266 vrecycle(vp);
1267 else
1268 tmpfs_check_mtime(vp);
1269 return (0);
1270}
1271
1272int
1273tmpfs_reclaim(struct vop_reclaim_args *v)
1274{
1275 struct vnode *vp = v->a_vp;
1276
1277 struct tmpfs_mount *tmp;
1278 struct tmpfs_node *node;
1279
1280 node = VP_TO_TMPFS_NODE(vp);
1281 tmp = VFS_TO_TMPFS(vp->v_mount);
1282
1283 if (vp->v_type == VREG)
1284 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
1285 else
1286 vnode_destroy_vobject(vp);
1287 vp->v_object = NULL;
|
1273 cache_purge(vp);
|
1288 if (tmpfs_use_nc(vp))
1289 cache_purge(vp); |
1290
1291 TMPFS_NODE_LOCK(node);
1292 tmpfs_free_vp(vp);
1293
1294 /* If the node referenced by this vnode was deleted by the user,
1295 * we must free its associated data structures (now that the vnode
1296 * is being reclaimed). */
1297 if (node->tn_links == 0 &&
1298 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1299 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1300 TMPFS_NODE_UNLOCK(node);
1301 tmpfs_free_node(tmp, node);
1302 } else
1303 TMPFS_NODE_UNLOCK(node);
1304
1305 MPASS(vp->v_data == NULL);
1306 return 0;
1307}
1308
1309static int
1310tmpfs_print(struct vop_print_args *v)
1311{
1312 struct vnode *vp = v->a_vp;
1313
1314 struct tmpfs_node *node;
1315
1316 node = VP_TO_TMPFS_NODE(vp);
1317
1318 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n",
1319 node, node->tn_flags, node->tn_links);
1320 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
1321 node->tn_mode, node->tn_uid, node->tn_gid,
1322 (intmax_t)node->tn_size, node->tn_status);
1323
1324 if (vp->v_type == VFIFO)
1325 fifo_printinfo(vp);
1326
1327 printf("\n");
1328
1329 return 0;
1330}
1331
1332static int
1333tmpfs_pathconf(struct vop_pathconf_args *v)
1334{
1335 int name = v->a_name;
1336 register_t *retval = v->a_retval;
1337
1338 int error;
1339
1340 error = 0;
1341
1342 switch (name) {
1343 case _PC_LINK_MAX:
1344 *retval = LINK_MAX;
1345 break;
1346
1347 case _PC_NAME_MAX:
1348 *retval = NAME_MAX;
1349 break;
1350
1351 case _PC_PATH_MAX:
1352 *retval = PATH_MAX;
1353 break;
1354
1355 case _PC_PIPE_BUF:
1356 *retval = PIPE_BUF;
1357 break;
1358
1359 case _PC_CHOWN_RESTRICTED:
1360 *retval = 1;
1361 break;
1362
1363 case _PC_NO_TRUNC:
1364 *retval = 1;
1365 break;
1366
1367 case _PC_SYNC_IO:
1368 *retval = 1;
1369 break;
1370
1371 case _PC_FILESIZEBITS:
1372 *retval = 0; /* XXX Don't know which value should I return. */
1373 break;
1374
1375 default:
1376 error = EINVAL;
1377 }
1378
1379 return error;
1380}
1381
1382static int
1383tmpfs_vptofh(struct vop_vptofh_args *ap)
1384{
1385 struct tmpfs_fid *tfhp;
1386 struct tmpfs_node *node;
1387
1388 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1389 node = VP_TO_TMPFS_NODE(ap->a_vp);
1390
1391 tfhp->tf_len = sizeof(struct tmpfs_fid);
1392 tfhp->tf_id = node->tn_id;
1393 tfhp->tf_gen = node->tn_gen;
1394
1395 return (0);
1396}
1397
1398static int
1399tmpfs_whiteout(struct vop_whiteout_args *ap)
1400{
1401 struct vnode *dvp = ap->a_dvp;
1402 struct componentname *cnp = ap->a_cnp;
1403 struct tmpfs_dirent *de;
1404
1405 switch (ap->a_flags) {
1406 case LOOKUP:
1407 return (0);
1408 case CREATE:
1409 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1410 if (de != NULL)
1411 return (de->td_node == NULL ? 0 : EEXIST);
1412 return (tmpfs_dir_whiteout_add(dvp, cnp));
1413 case DELETE:
1414 tmpfs_dir_whiteout_remove(dvp, cnp);
1415 return (0);
1416 default:
1417 panic("tmpfs_whiteout: unknown op");
1418 }
1419}
1420
1421static int
1422tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp,
1423 struct tmpfs_dirent **pde)
1424{
1425 struct tmpfs_dir_cursor dc;
1426 struct tmpfs_dirent *de;
1427
1428 for (de = tmpfs_dir_first(tnp, &dc); de != NULL;
1429 de = tmpfs_dir_next(tnp, &dc)) {
1430 if (de->td_node == tn) {
1431 *pde = de;
1432 return (0);
1433 }
1434 }
1435 return (ENOENT);
1436}
1437
1438static int
1439tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn,
1440 struct tmpfs_node *tnp, char *buf, int *buflen, struct vnode **dvp)
1441{
1442 struct tmpfs_dirent *de;
1443 int error, i;
1444
1445 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED,
1446 dvp);
1447 if (error != 0)
1448 return (error);
1449 error = tmpfs_vptocnp_dir(tn, tnp, &de);
1450 if (error == 0) {
1451 i = *buflen;
1452 i -= de->td_namelen;
1453 if (i < 0) {
1454 error = ENOMEM;
1455 } else {
1456 bcopy(de->ud.td_name, buf + i, de->td_namelen);
1457 *buflen = i;
1458 }
1459 }
1460 if (error == 0) {
1461 if (vp != *dvp)
1462 VOP_UNLOCK(*dvp, 0);
1463 } else {
1464 if (vp != *dvp)
1465 vput(*dvp);
1466 else
1467 vrele(vp);
1468 }
1469 return (error);
1470}
1471
1472static int
1473tmpfs_vptocnp(struct vop_vptocnp_args *ap)
1474{
1475 struct vnode *vp, **dvp;
1476 struct tmpfs_node *tn, *tnp, *tnp1;
1477 struct tmpfs_dirent *de;
1478 struct tmpfs_mount *tm;
1479 char *buf;
1480 int *buflen;
1481 int error;
1482
1483 vp = ap->a_vp;
1484 dvp = ap->a_vpp;
1485 buf = ap->a_buf;
1486 buflen = ap->a_buflen;
1487
1488 tm = VFS_TO_TMPFS(vp->v_mount);
1489 tn = VP_TO_TMPFS_NODE(vp);
1490 if (tn->tn_type == VDIR) {
1491 tnp = tn->tn_dir.tn_parent;
1492 if (tnp == NULL)
1493 return (ENOENT);
1494 tmpfs_ref_node(tnp);
1495 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf,
1496 buflen, dvp);
1497 tmpfs_free_node(tm, tnp);
1498 return (error);
1499 }
1500restart:
1501 TMPFS_LOCK(tm);
1502 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) {
1503 if (tnp->tn_type != VDIR)
1504 continue;
1505 TMPFS_NODE_LOCK(tnp);
1506 tmpfs_ref_node_locked(tnp);
1507
1508 /*
1509 * tn_vnode cannot be instantiated while we hold the
1510 * node lock, so the directory cannot be changed while
1511 * we iterate over it. Do this to avoid instantiating
1512 * vnode for directories which cannot point to our
1513 * node.
1514 */
1515 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp,
1516 &de) : 0;
1517
1518 if (error == 0) {
1519 TMPFS_NODE_UNLOCK(tnp);
1520 TMPFS_UNLOCK(tm);
1521 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen,
1522 dvp);
1523 if (error == 0) {
1524 tmpfs_free_node(tm, tnp);
1525 return (0);
1526 }
1527 if ((vp->v_iflag & VI_DOOMED) != 0) {
1528 tmpfs_free_node(tm, tnp);
1529 return (ENOENT);
1530 }
1531 TMPFS_LOCK(tm);
1532 TMPFS_NODE_LOCK(tnp);
1533 }
1534 if (tmpfs_free_node_locked(tm, tnp, false)) {
1535 goto restart;
1536 } else {
1537 KASSERT(tnp->tn_refcount > 0,
1538 ("node %p refcount zero", tnp));
1539 tnp1 = LIST_NEXT(tnp, tn_entries);
1540 TMPFS_NODE_UNLOCK(tnp);
1541 }
1542 }
1543 TMPFS_UNLOCK(tm);
1544 return (ENOENT);
1545}
1546
1547/*
1548 * Vnode operations vector used for files stored in a tmpfs file system.
1549 */
1550struct vop_vector tmpfs_vnodeop_entries = {
1551 .vop_default = &default_vnodeops,
1552 .vop_lookup = vfs_cache_lookup,
|
1537 .vop_cachedlookup = tmpfs_lookup,
|
| 1553 .vop_cachedlookup = tmpfs_cached_lookup, |
1554 .vop_create = tmpfs_create,
1555 .vop_mknod = tmpfs_mknod,
1556 .vop_open = tmpfs_open,
1557 .vop_close = tmpfs_close,
1558 .vop_access = tmpfs_access,
1559 .vop_getattr = tmpfs_getattr,
1560 .vop_setattr = tmpfs_setattr,
1561 .vop_read = tmpfs_read,
1562 .vop_write = tmpfs_write,
1563 .vop_fsync = tmpfs_fsync,
1564 .vop_remove = tmpfs_remove,
1565 .vop_link = tmpfs_link,
1566 .vop_rename = tmpfs_rename,
1567 .vop_mkdir = tmpfs_mkdir,
1568 .vop_rmdir = tmpfs_rmdir,
1569 .vop_symlink = tmpfs_symlink,
1570 .vop_readdir = tmpfs_readdir,
1571 .vop_readlink = tmpfs_readlink,
1572 .vop_inactive = tmpfs_inactive,
1573 .vop_reclaim = tmpfs_reclaim,
1574 .vop_print = tmpfs_print,
1575 .vop_pathconf = tmpfs_pathconf,
1576 .vop_vptofh = tmpfs_vptofh,
1577 .vop_whiteout = tmpfs_whiteout,
1578 .vop_bmap = VOP_EOPNOTSUPP,
1579 .vop_vptocnp = tmpfs_vptocnp,
1580};
1581
|
1582/*
1583 * Same vector for mounts which do not use namecache.
1584 */
1585struct vop_vector tmpfs_vnodeop_nonc_entries = {
1586 .vop_default = &tmpfs_vnodeop_entries,
1587 .vop_lookup = tmpfs_lookup,
1588}; |
|