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kernel - TMPFS - Bug fixing pass - directory hierarchy
[dragonfly.git] / sys / vfs / tmpfs / tmpfs_vnops.c
blob59c7cd82cbe4ca8b6e3ef0d7f994ac19feef20c0
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
38 #include <sys/kernel.h>
39 #include <sys/kern_syscall.h>
40 #include <sys/param.h>
41 #include <sys/fcntl.h>
42 #include <sys/lockf.h>
43 #include <sys/priv.h>
44 #include <sys/proc.h>
45 #include <sys/resourcevar.h>
46 #include <sys/sched.h>
47 #include <sys/sfbuf.h>
48 #include <sys/stat.h>
49 #include <sys/systm.h>
50 #include <sys/unistd.h>
51 #include <sys/vfsops.h>
52 #include <sys/vnode.h>
53
54 #include <sys/mplock2.h>
55
56 #include <vm/vm.h>
57 #include <vm/vm_object.h>
58 #include <vm/vm_page.h>
59 #include <vm/vm_pager.h>
60
61 #include <vfs/fifofs/fifo.h>
62 #include <vfs/tmpfs/tmpfs_vnops.h>
63 #include <vfs/tmpfs/tmpfs.h>
64
65 MALLOC_DECLARE(M_TMPFS);
66
67 /* --------------------------------------------------------------------- */
68
69 static int
70 tmpfs_nresolve(struct vop_nresolve_args *v)
71 {
72 struct vnode *dvp = v->a_dvp;
73 struct vnode *vp = NULL;
74 struct namecache *ncp = v->a_nch->ncp;
75 struct ucred *cred = v->a_cred;
76
77 int error;
78 struct tmpfs_dirent *de;
79 struct tmpfs_node *dnode;
80
81 dnode = VP_TO_TMPFS_DIR(dvp);
82
83 if (!vn_islocked(dvp));
84 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
85
86 /* Check accessibility of requested node as a first step. */
87 error = VOP_ACCESS(dvp, VEXEC, cred);
88 if (error != 0)
89 goto out;
90
91 if (dnode->tn_dir.tn_parent == NULL) {
92 error = ENOENT;
93 goto out;
94 }
95
96 de = tmpfs_dir_lookup(dnode, NULL, ncp);
97 if (de == NULL) {
98 /* The entry was not found in the directory.
99 * This is OK if we are creating or renaming an
100 * entry and are working on the last component of
101 * the path name. */
102 error = VOP_ACCESS(dvp, VWRITE, cred);
103 if (error != 0)
104 goto out;
105 else {
106 error = ENOENT;
107 goto out;
108 }
109 } else {
110 struct tmpfs_node *tnode;
111
112 /* The entry was found, so get its associated
113 * tmpfs_node. */
114 tnode = de->td_node;
115
116 /* If we are not at the last path component and
117 * found a non-directory or non-link entry (which
118 * may itself be pointing to a directory), raise
119 * an error. */
120 if (tnode->tn_links > 1 &&
121 tnode->tn_type != VDIR && tnode->tn_type != VLNK) {
122 error = ENOTDIR;
123 goto out;
124 }
125
126 error = VOP_ACCESS(dvp, VWRITE, cred);
127 if (error != 0)
128 goto out;
129
130 /* Allocate a new vnode on the matching entry. */
131 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
132 LK_EXCLUSIVE | LK_RETRY, &vp);
133 if (error != 0)
134 goto out;
135
136 if ((dnode->tn_mode & S_ISTXT) &&
137 VOP_ACCESS(vp, VWRITE, cred)) {
138 error = EPERM;
139 vp = NULL;
140 goto out;
141 }
142 }
143
144 KKASSERT(vp);
145
146 out:
147 vn_unlock(dvp);
148 /* Store the result of this lookup in the cache. Avoid this if the
149 * request was for creation, as it does not improve timings on
150 * emprical tests. */
151 if (vp) {
152 vn_unlock(vp);
153 cache_setvp(v->a_nch, vp);
154 vrele(vp);
155 }
156 if (error == ENOENT) {
157 cache_setvp(v->a_nch, NULL);
158 }
159 return error;
160 }
161
162 static int
163 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v)
164 {
165 struct vnode *dvp = v->a_dvp;
166 struct vnode **vpp = v->a_vpp;
167 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp);
168 struct ucred *cred = v->a_cred;
169 int error;
170
171 *vpp = NULL;
172 /* Check accessibility of requested node as a first step. */
173 error = VOP_ACCESS(dvp, VEXEC, cred);
174 if (error != 0)
175 return error;
176
177 if (dnode->tn_dir.tn_parent != NULL) {
178 /* Allocate a new vnode on the matching entry. */
179 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
180 LK_EXCLUSIVE | LK_RETRY, vpp);
181
182 if (*vpp)
183 vn_unlock(*vpp);
184 }
185
186 return (*vpp == NULL) ? ENOENT : 0;
187 }
188
189 /* --------------------------------------------------------------------- */
190
191 static int
192 tmpfs_ncreate(struct vop_ncreate_args *v)
193 {
194 struct vnode *dvp = v->a_dvp;
195 struct vnode **vpp = v->a_vpp;
196 struct namecache *ncp = v->a_nch->ncp;
197 struct vattr *vap = v->a_vap;
198 struct ucred *cred = v->a_cred;
199 int error;
200
201 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK);
202
203 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
204 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
205 if (error == 0) {
206 cache_setunresolved(v->a_nch);
207 cache_setvp(v->a_nch, *vpp);
208 }
209 vn_unlock(dvp);
210
211 return error;
212 }
213 /* --------------------------------------------------------------------- */
214
215 static int
216 tmpfs_nmknod(struct vop_nmknod_args *v)
217 {
218 struct vnode *dvp = v->a_dvp;
219 struct vnode **vpp = v->a_vpp;
220 struct namecache *ncp = v->a_nch->ncp;
221 struct vattr *vap = v->a_vap;
222 struct ucred *cred = v->a_cred;
223 int error;
224
225 if (vap->va_type != VBLK && vap->va_type != VCHR &&
226 vap->va_type != VFIFO)
227 return EINVAL;
228
229 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
230 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
231 if (error == 0) {
232 cache_setunresolved(v->a_nch);
233 cache_setvp(v->a_nch, *vpp);
234 }
235 vn_unlock(dvp);
236
237 return error;
238 }
239
240 /* --------------------------------------------------------------------- */
241
242 static int
243 tmpfs_open(struct vop_open_args *v)
244 {
245 struct vnode *vp = v->a_vp;
246 int mode = v->a_mode;
247
248 int error;
249 struct tmpfs_node *node;
250
251 KKASSERT(vn_islocked(vp));
252
253 node = VP_TO_TMPFS_NODE(vp);
254
255 /* The file is still active but all its names have been removed
256 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
257 * it is about to die. */
258 if (node->tn_links < 1)
259 return (ENOENT);
260
261 /* If the file is marked append-only, deny write requests. */
262 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
263 error = EPERM;
264 else {
265 return (vop_stdopen(v));
266 }
267
268 KKASSERT(vn_islocked(vp));
269 return error;
270 }
271
272 /* --------------------------------------------------------------------- */
273
274 static int
275 tmpfs_close(struct vop_close_args *v)
276 {
277 struct vnode *vp = v->a_vp;
278 struct tmpfs_node *node;
279
280 node = VP_TO_TMPFS_NODE(vp);
281
282 if (node->tn_links > 0) {
283 /* Update node times. No need to do it if the node has
284 * been deleted, because it will vanish after we return. */
285 tmpfs_update(vp);
286 }
287
288 return vop_stdclose(v);
289 }
290
291 /* --------------------------------------------------------------------- */
292
293 int
294 tmpfs_access(struct vop_access_args *v)
295 {
296 struct vnode *vp = v->a_vp;
297 int error;
298 struct tmpfs_node *node;
299
300 KKASSERT(vn_islocked(vp));
301
302 node = VP_TO_TMPFS_NODE(vp);
303
304 switch (vp->v_type) {
305 case VDIR:
306 /* FALLTHROUGH */
307 case VLNK:
308 /* FALLTHROUGH */
309 case VREG:
310 if (VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
311 error = EROFS;
312 goto out;
313 }
314 break;
315
316 case VBLK:
317 /* FALLTHROUGH */
318 case VCHR:
319 /* FALLTHROUGH */
320 case VSOCK:
321 /* FALLTHROUGH */
322 case VFIFO:
323 break;
324
325 default:
326 error = EINVAL;
327 goto out;
328 }
329
330 if (VWRITE && node->tn_flags & IMMUTABLE) {
331 error = EPERM;
332 goto out;
333 }
334
335 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0);
336
337 out:
338
339 return error;
340 }
341
342 /* --------------------------------------------------------------------- */
343
344 int
345 tmpfs_getattr(struct vop_getattr_args *v)
346 {
347 struct vnode *vp = v->a_vp;
348 struct vattr *vap = v->a_vap;
349
350 struct tmpfs_node *node;
351 int needunlock = 0;
352
353 if(!vn_islocked(vp)) {
354 needunlock = 1;
355 vn_lock(vp, LK_SHARED | LK_RETRY);
356 }
357
358 node = VP_TO_TMPFS_NODE(vp);
359
360 tmpfs_update(vp);
361
362 vap->va_type = vp->v_type;
363 vap->va_mode = node->tn_mode;
364 vap->va_nlink = node->tn_links;
365 vap->va_uid = node->tn_uid;
366 vap->va_gid = node->tn_gid;
367 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
368 vap->va_fileid = node->tn_id;
369 vap->va_size = node->tn_size;
370 vap->va_blocksize = PAGE_SIZE;
371 vap->va_atime.tv_sec = node->tn_atime;
372 vap->va_atime.tv_nsec = node->tn_atimensec;
373 vap->va_mtime.tv_sec = node->tn_mtime;
374 vap->va_mtime.tv_nsec = node->tn_mtimensec;
375 vap->va_ctime.tv_sec = node->tn_ctime;
376 vap->va_ctime.tv_nsec = node->tn_ctimensec;
377 vap->va_gen = node->tn_gen;
378 vap->va_flags = node->tn_flags;
379 if (vp->v_type == VBLK || vp->v_type == VCHR)
380 {
381 vap->va_rmajor = umajor(node->tn_rdev);
382 vap->va_rminor = uminor(node->tn_rdev);
383 }
384 vap->va_bytes = round_page(node->tn_size);
385 vap->va_filerev = 0;
386
387 if (needunlock)
388 vn_unlock(vp);
389
390 return 0;
391 }
392
393 /* --------------------------------------------------------------------- */
394
395 int
396 tmpfs_setattr(struct vop_setattr_args *v)
397 {
398 struct vnode *vp = v->a_vp;
399 struct vattr *vap = v->a_vap;
400 struct ucred *cred = v->a_cred;
401
402 int error = 0;
403 int needunlock = 0;
404
405 if(!vn_islocked(vp)) {
406 needunlock = 1;
407 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
408 }
409
410 /* Abort if any unsettable attribute is given. */
411 if (vap->va_type != VNON ||
412 vap->va_nlink != VNOVAL ||
413 vap->va_fsid != VNOVAL ||
414 vap->va_fileid != VNOVAL ||
415 vap->va_blocksize != VNOVAL ||
416 vap->va_gen != VNOVAL ||
417 vap->va_rmajor != VNOVAL ||
418 vap->va_bytes != VNOVAL)
419 error = EINVAL;
420
421 if (error == 0 && (vap->va_flags != VNOVAL))
422 error = tmpfs_chflags(vp, vap->va_flags, cred);
423
424 if (error == 0 && (vap->va_size != VNOVAL))
425 error = tmpfs_chsize(vp, vap->va_size, cred);
426
427 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
428 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred);
429
430 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
431 error = tmpfs_chmod(vp, vap->va_mode, cred);
432
433 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
434 vap->va_atime.tv_nsec != VNOVAL) ||
435 (vap->va_mtime.tv_sec != VNOVAL &&
436 vap->va_mtime.tv_nsec != VNOVAL) ))
437 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
438 vap->va_vaflags, cred);
439
440 /* Update the node times. We give preference to the error codes
441 * generated by this function rather than the ones that may arise
442 * from tmpfs_update. */
443 tmpfs_update(vp);
444
445 if (needunlock)
446 vn_unlock(vp);
447
448 return error;
449 }
450
451 /* --------------------------------------------------------------------- */
452
453 /*
454 * fsync is basically a NOP. However, when unmounting we have
455 * to clean out the buffer cache to prevent a dirty buffers kernel
456 * assertion. We can do this simply by truncating the file to 0.
457 */
458 static int
459 tmpfs_fsync(struct vop_fsync_args *v)
460 {
461 struct tmpfs_mount *tmp;
462 struct vnode *vp = v->a_vp;
463
464 tmp = VFS_TO_TMPFS(vp->v_mount);
465 if (tmp->tm_flags & TMPFS_FLAG_UNMOUNTING) {
466 if (vp->v_type == VREG)
467 tmpfs_truncate(vp, 0);
468 } else {
469 tmpfs_update(vp);
470 }
471 return 0;
472 }
473
474 /* --------------------------------------------------------------------- */
475
476 static int
477 tmpfs_read (struct vop_read_args *ap)
478 {
479 struct buf *bp;
480 struct vnode *vp = ap->a_vp;
481 struct uio *uio = ap->a_uio;
482 struct tmpfs_node *node;
483 off_t base_offset;
484 size_t offset;
485 size_t len;
486 int got_mplock;
487 int error;
488
489 error = 0;
490 if (uio->uio_resid == 0) {
491 return error;
492 }
493
494 node = VP_TO_TMPFS_NODE(vp);
495
496 if (uio->uio_offset < 0)
497 return (EINVAL);
498 if (vp->v_type != VREG)
499 return (EINVAL);
500
501 vn_lock(vp, LK_SHARED | LK_RETRY);
502
503 #ifdef SMP
504 if(curthread->td_mpcount)
505 got_mplock = -1;
506 else
507 got_mplock = 0;
508 #else
509 got_mplock = -1;
510 #endif
511
512 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) {
513 /*
514 * Use buffer cache I/O (via tmpfs_strategy)
515 */
516 offset = (size_t)uio->uio_offset & BMASK;
517 base_offset = (off_t)uio->uio_offset - offset;
518 bp = getcacheblk(vp, base_offset);
519 if (bp == NULL)
520 {
521 if (got_mplock == 0) {
522 got_mplock = 1;
523 get_mplock();
524 }
525
526 error = bread(vp, base_offset, BSIZE, &bp);
527 if (error) {
528 brelse(bp);
529 kprintf("tmpfs_read bread error %d\n", error);
530 break;
531 }
532 }
533
534 if (got_mplock == 0) {
535 got_mplock = 1;
536 get_mplock();
537 }
538
539 /*
540 * Figure out how many bytes we can actually copy this loop.
541 */
542 len = BSIZE - offset;
543 if (len > uio->uio_resid)
544 len = uio->uio_resid;
545 if (len > node->tn_size - uio->uio_offset)
546 len = (size_t)(node->tn_size - uio->uio_offset);
547
548 error = uiomove((char *)bp->b_data + offset, len, uio);
549 bqrelse(bp);
550 if (error) {
551 kprintf("tmpfs_read uiomove error %d\n", error);
552 break;
553 }
554 }
555
556 if (got_mplock > 0)
557 rel_mplock();
558
559 TMPFS_NODE_LOCK(node);
560 node->tn_status |= TMPFS_NODE_ACCESSED;
561 TMPFS_NODE_UNLOCK(node);
562
563 vn_unlock(vp);
564
565 return(error);
566 }
567
568 static int
569 tmpfs_write (struct vop_write_args *ap)
570 {
571 struct buf *bp;
572 struct vnode *vp = ap->a_vp;
573 struct uio *uio = ap->a_uio;
574 struct thread *td = uio->uio_td;
575 struct tmpfs_node *node;
576 boolean_t extended;
577 off_t oldsize;
578 int error;
579 off_t base_offset;
580 size_t offset;
581 size_t len;
582 struct rlimit limit;
583 int got_mplock;
584 int trivial = 0;
585
586 error = 0;
587 if (uio->uio_resid == 0) {
588 return error;
589 }
590
591 node = VP_TO_TMPFS_NODE(vp);
592
593 if (vp->v_type != VREG)
594 return (EINVAL);
595
596 oldsize = node->tn_size;
597 if (ap->a_ioflag & IO_APPEND)
598 uio->uio_offset = node->tn_size;
599
600 /*
601 * Check for illegal write offsets.
602 */
603 if (uio->uio_offset + uio->uio_resid >
604 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
605 return (EFBIG);
606
607 if (vp->v_type == VREG && td != NULL) {
608 error = kern_getrlimit(RLIMIT_FSIZE, &limit);
609 if (error != 0)
610 return error;
611 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) {
612 ksignal(td->td_proc, SIGXFSZ);
613 return (EFBIG);
614 }
615 }
616
617
618 /*
619 * Extend the file's size if necessary
620 */
621 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size);
622
623 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
624 #ifdef SMP
625 if(curthread->td_mpcount)
626 got_mplock = -1;
627 else {
628 got_mplock = 1;
629 get_mplock();
630 }
631 #else
632 got_mplock = -1;
633 #endif
634 while (uio->uio_resid > 0) {
635 /*
636 * Use buffer cache I/O (via tmpfs_strategy)
637 */
638 offset = (size_t)uio->uio_offset & BMASK;
639 base_offset = (off_t)uio->uio_offset - offset;
640 len = BSIZE - offset;
641 if (len > uio->uio_resid)
642 len = uio->uio_resid;
643
644 if ((uio->uio_offset + len) > node->tn_size) {
645 trivial = (uio->uio_offset <= node->tn_size);
646 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial);
647 if (error)
648 break;
649 }
650
651 /*
652 * Read to fill in any gaps. Theoretically we could
653 * optimize this if the write covers the entire buffer
654 * and is not a UIO_NOCOPY write, however this can lead
655 * to a security violation exposing random kernel memory
656 * (whatever junk was in the backing VM pages before).
657 *
658 * So just use bread() to do the right thing.
659 */
660 error = bread(vp, base_offset, BSIZE, &bp);
661 error = uiomove((char *)bp->b_data + offset, len, uio);
662 if (error) {
663 kprintf("tmpfs_write uiomove error %d\n", error);
664 brelse(bp);
665 break;
666 }
667
668 if (uio->uio_offset > node->tn_size)
669 node->tn_size = uio->uio_offset;
670
671 /*
672 * The data has been loaded into the buffer, write it out.
673 *
674 * We want tmpfs to be able to use all available ram, not
675 * just the buffer cache, so if not explicitly paging we
676 * use buwrite() to leave the buffer clean but mark all the
677 * VM pages valid+dirty.
678 *
679 * Be careful, the kernel uses IO_SYNC/IO_ASYNC when it
680 * really really wants to flush the buffer, typically as
681 * part of the paging system, and we'll loop forever if
682 * we fake those.
683 */
684 if (ap->a_ioflag & IO_SYNC)
685 bwrite(bp);
686 else if (ap->a_ioflag & IO_ASYNC)
687 bawrite(bp);
688 else
689 buwrite(bp);
690
691 if (bp->b_error) {
692 kprintf("tmpfs_write bwrite error %d\n", error);
693 break;
694 }
695 }
696
697 if (got_mplock > 0)
698 rel_mplock();
699
700 if (error) {
701 if (extended)
702 (void)tmpfs_reg_resize(vp, oldsize, trivial);
703 return error;
704 }
705
706 TMPFS_NODE_LOCK(node);
707 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
708 (extended? TMPFS_NODE_CHANGED : 0);
709
710 if (node->tn_mode & (S_ISUID | S_ISGID)) {
711 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
712 node->tn_mode &= ~(S_ISUID | S_ISGID);
713 }
714 TMPFS_NODE_UNLOCK(node);
715
716 vn_unlock(vp);
717
718 return(error);
719 }
720
721 static int
722 tmpfs_advlock (struct vop_advlock_args *ap)
723 {
724 struct tmpfs_node *node;
725 struct vnode *vp = ap->a_vp;
726
727 node = VP_TO_TMPFS_NODE(vp);
728
729 return (lf_advlock(ap, &node->tn_advlock, node->tn_size));
730 }
731
732
733 static int
734 tmpfs_strategy(struct vop_strategy_args *ap)
735 {
736 struct bio *bio = ap->a_bio;
737 struct buf *bp = bio->bio_buf;
738 struct vnode *vp = ap->a_vp;
739 struct tmpfs_node *node;
740 vm_object_t uobj;
741
742 if (vp->v_type != VREG) {
743 bp->b_resid = bp->b_bcount;
744 bp->b_flags |= B_ERROR | B_INVAL;
745 bp->b_error = EINVAL;
746 biodone(bio);
747 return(0);
748 }
749
750 node = VP_TO_TMPFS_NODE(vp);
751
752 uobj = node->tn_reg.tn_aobj;
753
754 /*
755 * Call swap_pager_strategy to read or write between the VM
756 * object and the buffer cache.
757 */
758 swap_pager_strategy(uobj, bio);
759
760 return 0;
761 }
762
763 static int
764 tmpfs_bmap(struct vop_bmap_args *ap)
765 {
766 if (ap->a_doffsetp != NULL)
767 *ap->a_doffsetp = ap->a_loffset;
768 if (ap->a_runp != NULL)
769 *ap->a_runp = 0;
770 if (ap->a_runb != NULL)
771 *ap->a_runb = 0;
772
773 return 0;
774 }
775
776 /* --------------------------------------------------------------------- */
777
778 static int
779 tmpfs_nremove(struct vop_nremove_args *v)
780 {
781 struct vnode *dvp = v->a_dvp;
782 struct namecache *ncp = v->a_nch->ncp;
783 struct vnode *vp;
784 int error;
785 struct tmpfs_dirent *de;
786 struct tmpfs_mount *tmp;
787 struct tmpfs_node *dnode;
788 struct tmpfs_node *node;
789
790 /*
791 * We have to acquire the vp from v->a_nch because
792 * we will likely unresolve the namecache entry, and
793 * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim
794 * sequence to recover space from the file.
795 */
796 error = cache_vref(v->a_nch, v->a_cred, &vp);
797 KKASSERT(error == 0);
798 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
799
800 if (vp->v_type == VDIR) {
801 error = EISDIR;
802 goto out;
803 }
804
805 dnode = VP_TO_TMPFS_DIR(dvp);
806 node = VP_TO_TMPFS_NODE(vp);
807 tmp = VFS_TO_TMPFS(vp->v_mount);
808 de = tmpfs_dir_lookup(dnode, node, ncp);
809 if (de == NULL) {
810 error = ENOENT;
811 goto out;
812 }
813
814 /* Files marked as immutable or append-only cannot be deleted. */
815 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
816 (dnode->tn_flags & APPEND)) {
817 error = EPERM;
818 goto out;
819 }
820
821 /* Remove the entry from the directory; as it is a file, we do not
822 * have to change the number of hard links of the directory. */
823 tmpfs_dir_detach(dvp, de);
824
825 /* Free the directory entry we just deleted. Note that the node
826 * referred by it will not be removed until the vnode is really
827 * reclaimed. */
828 tmpfs_free_dirent(tmp, de);
829
830 if (node->tn_links > 0) {
831 TMPFS_NODE_LOCK(node);
832 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
833 TMPFS_NODE_MODIFIED;
834 TMPFS_NODE_UNLOCK(node);
835 }
836
837 cache_setunresolved(v->a_nch);
838 cache_setvp(v->a_nch, NULL);
839 /*cache_inval_vp(vp, CINV_DESTROY);*/
840 error = 0;
841
842 out:
843 vn_unlock(dvp);
844 vrele(vp);
845
846 return error;
847 }
848
849 /* --------------------------------------------------------------------- */
850
851 static int
852 tmpfs_nlink(struct vop_nlink_args *v)
853 {
854 struct vnode *dvp = v->a_dvp;
855 struct vnode *vp = v->a_vp;
856 struct namecache *ncp = v->a_nch->ncp;
857
858 int error;
859 struct tmpfs_dirent *de;
860 struct tmpfs_node *node;
861
862 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
863 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
864
865
866 KKASSERT(dvp != vp); /* XXX When can this be false? */
867
868 node = VP_TO_TMPFS_NODE(vp);
869
870 /* XXX: Why aren't the following two tests done by the caller? */
871
872 /* Hard links of directories are forbidden. */
873 if (vp->v_type == VDIR) {
874 error = EPERM;
875 goto out;
876 }
877
878 /* Cannot create cross-device links. */
879 if (dvp->v_mount != vp->v_mount) {
880 error = EXDEV;
881 goto out;
882 }
883
884 /* Ensure that we do not overflow the maximum number of links imposed
885 * by the system. */
886 KKASSERT(node->tn_links <= LINK_MAX);
887 if (node->tn_links == LINK_MAX) {
888 error = EMLINK;
889 goto out;
890 }
891
892 /* We cannot create links of files marked immutable or append-only. */
893 if (node->tn_flags & (IMMUTABLE | APPEND)) {
894 error = EPERM;
895 goto out;
896 }
897
898 /* Allocate a new directory entry to represent the node. */
899 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
900 ncp->nc_name, ncp->nc_nlen, &de);
901 if (error != 0)
902 goto out;
903
904 /* Insert the new directory entry into the appropriate directory. */
905 tmpfs_dir_attach(dvp, de);
906
907 /* vp link count has changed, so update node times. */
908
909 TMPFS_NODE_LOCK(node);
910 node->tn_status |= TMPFS_NODE_CHANGED;
911 TMPFS_NODE_UNLOCK(node);
912 tmpfs_update(vp);
913
914 cache_setunresolved(v->a_nch);
915 cache_setvp(v->a_nch, vp);
916 error = 0;
917
918 out:
919 vn_unlock(vp);
920 vn_unlock(dvp);
921
922 return error;
923 }
924
925 /* --------------------------------------------------------------------- */
926
927 static int
928 tmpfs_nrename(struct vop_nrename_args *v)
929 {
930 struct vnode *fdvp = v->a_fdvp;
931 struct namecache *fncp = v->a_fnch->ncp;
932 struct vnode *fvp = fncp->nc_vp;
933 struct vnode *tdvp = v->a_tdvp;
934 struct namecache *tncp = v->a_tnch->ncp;
935 struct vnode *tvp = tncp->nc_vp;
936
937 char *newname;
938 int error;
939 struct tmpfs_dirent *de;
940 struct tmpfs_mount *tmp;
941 struct tmpfs_node *fdnode;
942 struct tmpfs_node *fnode;
943 struct tmpfs_node *tnode;
944 struct tmpfs_node *tdnode;
945
946 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY);
947 if(tvp != NULL && tdvp != tvp)
948 vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
949
950 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
951
952 /* Disallow cross-device renames.
953 * XXX Why isn't this done by the caller? */
954 if (fvp->v_mount != tdvp->v_mount ||
955 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
956 error = EXDEV;
957 goto out;
958 }
959
960 tmp = VFS_TO_TMPFS(tdvp->v_mount);
961 tdnode = VP_TO_TMPFS_DIR(tdvp);
962
963 /* If source and target are the same file, there is nothing to do. */
964 if (fvp == tvp) {
965 error = 0;
966 goto out;
967 }
968
969 /* If we need to move the directory between entries, lock the
970 * source so that we can safely operate on it. */
971 if (tdvp != fdvp) {
972 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
973 if (error != 0)
974 goto out;
975 }
976 fdnode = VP_TO_TMPFS_DIR(fdvp);
977 fnode = VP_TO_TMPFS_NODE(fvp);
978 de = tmpfs_dir_lookup(fdnode, fnode, fncp);
979
980 /* Avoid manipulating '.' and '..' entries. */
981 if (de == NULL) {
982 error = ENOENT;
983 goto out_locked;
984 }
985 KKASSERT(de->td_node == fnode);
986
987 /* If re-naming a directory to another preexisting directory
988 * ensure that the target directory is empty so that its
989 * removal causes no side effects.
990 * Kern_rename gurantees the destination to be a directory
991 * if the source is one. */
992 if (tvp != NULL) {
993 KKASSERT(tnode != NULL);
994
995 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
996 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
997 error = EPERM;
998 goto out_locked;
999 }
1000
1001 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
1002 if (tnode->tn_size > 0) {
1003 error = ENOTEMPTY;
1004 goto out_locked;
1005 }
1006 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1007 error = ENOTDIR;
1008 goto out_locked;
1009 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1010 error = EISDIR;
1011 goto out_locked;
1012 } else {
1013 KKASSERT(fnode->tn_type != VDIR &&
1014 tnode->tn_type != VDIR);
1015 }
1016 }
1017
1018 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
1019 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1020 error = EPERM;
1021 goto out_locked;
1022 }
1023
1024 /* Ensure that we have enough memory to hold the new name, if it
1025 * has to be changed. */
1026 if (fncp->nc_nlen != tncp->nc_nlen ||
1027 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) {
1028 newname = kmalloc(tncp->nc_nlen + 1, M_TMPFSNAME, M_WAITOK);
1029 } else
1030 newname = NULL;
1031
1032 /* If the node is being moved to another directory, we have to do
1033 * the move. */
1034 if (fdnode != tdnode) {
1035 /* In case we are moving a directory, we have to adjust its
1036 * parent to point to the new parent. */
1037 if (de->td_node->tn_type == VDIR) {
1038 struct tmpfs_node *n;
1039
1040 /* Ensure the target directory is not a child of the
1041 * directory being moved. Otherwise, we'd end up
1042 * with stale nodes. */
1043 n = tdnode;
1044 /* TMPFS_LOCK garanties that no nodes are freed while
1045 * traversing the list. Nodes can only be marked as
1046 * removed: tn_parent == NULL. */
1047 TMPFS_LOCK(tmp);
1048 TMPFS_NODE_LOCK(n);
1049 while (n != n->tn_dir.tn_parent) {
1050 struct tmpfs_node *parent;
1051
1052 if (n == fnode) {
1053 TMPFS_NODE_UNLOCK(n);
1054 TMPFS_UNLOCK(tmp);
1055 error = EINVAL;
1056 if (newname != NULL)
1057 kfree(newname, M_TMPFSNAME);
1058 goto out_locked;
1059 }
1060 parent = n->tn_dir.tn_parent;
1061 if (parent == NULL) {
1062 n = NULL;
1063 break;
1064 }
1065 TMPFS_NODE_LOCK(parent);
1066 if (parent->tn_dir.tn_parent == NULL) {
1067 TMPFS_NODE_UNLOCK(parent);
1068 n = NULL;
1069 break;
1070 }
1071 n = parent;
1072 }
1073 TMPFS_NODE_UNLOCK(n);
1074 TMPFS_UNLOCK(tmp);
1075 if (n == NULL) {
1076 error = EINVAL;
1077 if (newname != NULL)
1078 kfree(newname, M_TMPFSNAME);
1079 goto out_locked;
1080 }
1081
1082 /* Adjust the parent pointer. */
1083 TMPFS_VALIDATE_DIR(fnode);
1084 TMPFS_NODE_LOCK(de->td_node);
1085 de->td_node->tn_dir.tn_parent = tdnode;
1086
1087 /* As a result of changing the target of the '..'
1088 * entry, the link count of the source and target
1089 * directories has to be adjusted. */
1090 TMPFS_NODE_LOCK(tdnode);
1091 TMPFS_ASSERT_LOCKED(tdnode);
1092 TMPFS_NODE_LOCK(fdnode);
1093 TMPFS_ASSERT_LOCKED(fdnode);
1094
1095 tdnode->tn_links++;
1096 fdnode->tn_links--;
1097
1098 TMPFS_NODE_UNLOCK(fdnode);
1099 TMPFS_NODE_UNLOCK(tdnode);
1100 TMPFS_NODE_UNLOCK(de->td_node);
1101 }
1102
1103 /* Do the move: just remove the entry from the source directory
1104 * and insert it into the target one. */
1105 tmpfs_dir_detach(fdvp, de);
1106 tmpfs_dir_attach(tdvp, de);
1107 }
1108
1109 /* If the name has changed, we need to make it effective by changing
1110 * it in the directory entry. */
1111 if (newname != NULL) {
1112
1113 kfree(de->td_name, M_TMPFSNAME);
1114 de->td_namelen = (uint16_t)tncp->nc_nlen;
1115 bcopy(tncp->nc_name, newname, tncp->nc_nlen);
1116 newname[tncp->nc_nlen] = '\0';
1117 de->td_name = newname;
1118
1119 TMPFS_NODE_LOCK(tdnode);
1120 TMPFS_NODE_LOCK(fdnode);
1121
1122 fnode->tn_status |= TMPFS_NODE_CHANGED;
1123 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1124
1125 TMPFS_NODE_UNLOCK(fdnode);
1126 TMPFS_NODE_UNLOCK(tdnode);
1127 }
1128
1129 /* If we are overwriting an entry, we have to remove the old one
1130 * from the target directory. */
1131 if (tvp != NULL) {
1132 /* Remove the old entry from the target directory. */
1133 de = tmpfs_dir_lookup(tdnode, tnode, tncp);
1134 tmpfs_dir_detach(tdvp, de);
1135
1136 /* Free the directory entry we just deleted. Note that the
1137 * node referred by it will not be removed until the vnode is
1138 * really reclaimed. */
1139 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de);
1140 /*cache_inval_vp(tvp, CINV_DESTROY);*/
1141 }
1142
1143 cache_rename(v->a_fnch, v->a_tnch);
1144 error = 0;
1145
1146 out_locked:
1147 if (fdnode != tdnode)
1148 vn_unlock(fdvp);
1149
1150 out:
1151 /* Release target nodes. */
1152 /* XXX: I don't understand when tdvp can be the same as tvp, but
1153 * other code takes care of this... */
1154 if (tdvp == tvp)
1155 vrele(tdvp);
1156 else {
1157 if (tvp != NULL)
1158 vn_unlock(tvp);
1159 vn_unlock(tdvp);
1160 }
1161
1162 return error;
1163 }
1164
1165 /* --------------------------------------------------------------------- */
1166
1167 static int
1168 tmpfs_nmkdir(struct vop_nmkdir_args *v)
1169 {
1170 struct vnode *dvp = v->a_dvp;
1171 struct vnode **vpp = v->a_vpp;
1172 struct namecache *ncp = v->a_nch->ncp;
1173 struct vattr *vap = v->a_vap;
1174 struct ucred *cred = v->a_cred;
1175 int error;
1176
1177 KKASSERT(vap->va_type == VDIR);
1178
1179 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1180 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
1181 if (error == 0) {
1182 cache_setunresolved(v->a_nch);
1183 cache_setvp(v->a_nch, *vpp);
1184 }
1185 vn_unlock(dvp);
1186
1187 return error;
1188 }
1189
1190 /* --------------------------------------------------------------------- */
1191
1192 static int
1193 tmpfs_nrmdir(struct vop_nrmdir_args *v)
1194 {
1195 struct vnode *dvp = v->a_dvp;
1196 struct namecache *ncp = v->a_nch->ncp;
1197 struct vnode *vp;
1198
1199 int error;
1200 struct tmpfs_dirent *de;
1201 struct tmpfs_mount *tmp;
1202 struct tmpfs_node *dnode;
1203 struct tmpfs_node *node;
1204
1205 /*
1206 * We have to acquire the vp from v->a_nch because
1207 * we will likely unresolve the namecache entry, and
1208 * a vrele is needed to trigger the tmpfs_inactive/tmpfs_reclaim
1209 * sequence.
1210 */
1211 error = cache_vref(v->a_nch, v->a_cred, &vp);
1212 KKASSERT(error == 0);
1213 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1214
1215 tmp = VFS_TO_TMPFS(dvp->v_mount);
1216 dnode = VP_TO_TMPFS_DIR(dvp);
1217 node = VP_TO_TMPFS_DIR(vp);
1218
1219 /* Directories with more than two entries ('.' and '..') cannot be
1220 * removed. */
1221 if (node->tn_size > 0) {
1222 error = ENOTEMPTY;
1223 goto out;
1224 }
1225
1226 if ((dnode->tn_flags & APPEND)
1227 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1228 error = EPERM;
1229 goto out;
1230 }
1231
1232 /* This invariant holds only if we are not trying to remove "..".
1233 * We checked for that above so this is safe now. */
1234 KKASSERT(node->tn_dir.tn_parent == dnode);
1235
1236 /* Get the directory entry associated with node (vp). This was
1237 * filled by tmpfs_lookup while looking up the entry. */
1238 de = tmpfs_dir_lookup(dnode, node, ncp);
1239 KKASSERT(TMPFS_DIRENT_MATCHES(de,
1240 ncp->nc_name,
1241 ncp->nc_nlen));
1242
1243 /* Check flags to see if we are allowed to remove the directory. */
1244 if (dnode->tn_flags & APPEND
1245 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1246 error = EPERM;
1247 goto out;
1248 }
1249
1250
1251 /* Detach the directory entry from the directory (dnode). */
1252 tmpfs_dir_detach(dvp, de);
1253
1254 /* No vnode should be allocated for this entry from this point */
1255 TMPFS_NODE_LOCK(node);
1256 TMPFS_ASSERT_ELOCKED(node);
1257 TMPFS_NODE_LOCK(dnode);
1258 TMPFS_ASSERT_ELOCKED(dnode);
1259
1260 #if 0
1261 /* handled by tmpfs_free_node */
1262 KKASSERT(node->tn_links > 0);
1263 node->tn_links--;
1264 node->tn_dir.tn_parent = NULL;
1265 #endif
1266 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1267 TMPFS_NODE_MODIFIED;
1268
1269 #if 0
1270 /* handled by tmpfs_free_node */
1271 KKASSERT(dnode->tn_links > 0);
1272 dnode->tn_links--;
1273 #endif
1274 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1275 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1276
1277 TMPFS_NODE_UNLOCK(dnode);
1278 TMPFS_NODE_UNLOCK(node);
1279
1280 /* Free the directory entry we just deleted. Note that the node
1281 * referred by it will not be removed until the vnode is really
1282 * reclaimed. */
1283 tmpfs_free_dirent(tmp, de);
1284
1285 /* Release the deleted vnode (will destroy the node, notify
1286 * interested parties and clean it from the cache). */
1287
1288 TMPFS_NODE_LOCK(dnode);
1289 dnode->tn_status |= TMPFS_NODE_CHANGED;
1290 TMPFS_NODE_UNLOCK(dnode);
1291 tmpfs_update(dvp);
1292
1293 cache_setunresolved(v->a_nch);
1294 cache_setvp(v->a_nch, NULL);
1295 /*cache_inval_vp(vp, CINV_DESTROY);*/
1296 error = 0;
1297
1298 out:
1299 vn_unlock(dvp);
1300 vrele(vp);
1301
1302 return error;
1303 }
1304
1305 /* --------------------------------------------------------------------- */
1306
1307 static int
1308 tmpfs_nsymlink(struct vop_nsymlink_args *v)
1309 {
1310 struct vnode *dvp = v->a_dvp;
1311 struct vnode **vpp = v->a_vpp;
1312 struct namecache *ncp = v->a_nch->ncp;
1313 struct vattr *vap = v->a_vap;
1314 struct ucred *cred = v->a_cred;
1315 char *target = v->a_target;
1316 int error;
1317
1318 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1319 vap->va_type = VLNK;
1320 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target);
1321 if (error == 0) {
1322 cache_setunresolved(v->a_nch);
1323 cache_setvp(v->a_nch, *vpp);
1324 }
1325 vn_unlock(dvp);
1326
1327 return error;
1328 }
1329
1330 /* --------------------------------------------------------------------- */
1331
1332 static int
1333 tmpfs_readdir(struct vop_readdir_args *v)
1334 {
1335 struct vnode *vp = v->a_vp;
1336 struct uio *uio = v->a_uio;
1337 int *eofflag = v->a_eofflag;
1338 off_t **cookies = v->a_cookies;
1339 int *ncookies = v->a_ncookies;
1340
1341 int error;
1342 off_t startoff;
1343 off_t cnt = 0;
1344 struct tmpfs_node *node;
1345
1346 /* This operation only makes sense on directory nodes. */
1347 if (vp->v_type != VDIR)
1348 return ENOTDIR;
1349
1350 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1351
1352 node = VP_TO_TMPFS_DIR(vp);
1353 startoff = uio->uio_offset;
1354
1355 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1356 error = tmpfs_dir_getdotdent(node, uio);
1357 if (error != 0)
1358 goto outok;
1359 cnt++;
1360 }
1361
1362 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1363 error = tmpfs_dir_getdotdotdent(node, uio);
1364 if (error != 0)
1365 goto outok;
1366 cnt++;
1367 }
1368
1369 error = tmpfs_dir_getdents(node, uio, &cnt);
1370
1371 outok:
1372 KKASSERT(error >= -1);
1373
1374 if (error == -1)
1375 error = 0;
1376
1377 if (eofflag != NULL)
1378 *eofflag =
1379 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1380
1381 /* Update NFS-related variables. */
1382 if (error == 0 && cookies != NULL && ncookies != NULL) {
1383 off_t i;
1384 off_t off = startoff;
1385 struct tmpfs_dirent *de = NULL;
1386
1387 *ncookies = cnt;
1388 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1389
1390 for (i = 0; i < cnt; i++) {
1391 KKASSERT(off != TMPFS_DIRCOOKIE_EOF);
1392 if (off == TMPFS_DIRCOOKIE_DOT) {
1393 off = TMPFS_DIRCOOKIE_DOTDOT;
1394 } else {
1395 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1396 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
1397 } else if (de != NULL) {
1398 de = TAILQ_NEXT(de, td_entries);
1399 } else {
1400 de = tmpfs_dir_lookupbycookie(node,
1401 off);
1402 KKASSERT(de != NULL);
1403 de = TAILQ_NEXT(de, td_entries);
1404 }
1405 if (de == NULL)
1406 off = TMPFS_DIRCOOKIE_EOF;
1407 else
1408 off = tmpfs_dircookie(de);
1409 }
1410
1411 (*cookies)[i] = off;
1412 }
1413 KKASSERT(uio->uio_offset == off);
1414 }
1415 vn_unlock(vp);
1416
1417 return error;
1418 }
1419
1420 /* --------------------------------------------------------------------- */
1421
1422 static int
1423 tmpfs_readlink(struct vop_readlink_args *v)
1424 {
1425 struct vnode *vp = v->a_vp;
1426 struct uio *uio = v->a_uio;
1427
1428 int error;
1429 struct tmpfs_node *node;
1430
1431 KKASSERT(uio->uio_offset == 0);
1432 KKASSERT(vp->v_type == VLNK);
1433
1434 node = VP_TO_TMPFS_NODE(vp);
1435
1436 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1437 uio);
1438 TMPFS_NODE_LOCK(node);
1439 node->tn_status |= TMPFS_NODE_ACCESSED;
1440 TMPFS_NODE_UNLOCK(node);
1441
1442 return error;
1443 }
1444
1445 /* --------------------------------------------------------------------- */
1446
1447 static int
1448 tmpfs_inactive(struct vop_inactive_args *v)
1449 {
1450 struct vnode *vp = v->a_vp;
1451
1452 struct tmpfs_node *node;
1453
1454 KKASSERT(vn_islocked(vp));
1455
1456 node = VP_TO_TMPFS_NODE(vp);
1457
1458 /*
1459 * Get rid of unreferenced deleted vnodes sooner rather than
1460 * later so the data memory can be recovered immediately.
1461 */
1462 TMPFS_NODE_LOCK(node);
1463 if (node->tn_links == 0 &&
1464 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1465 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1466 TMPFS_NODE_UNLOCK(node);
1467 vrecycle(vp);
1468 } else {
1469 TMPFS_NODE_UNLOCK(node);
1470 }
1471
1472 return 0;
1473 }
1474
1475 /* --------------------------------------------------------------------- */
1476
1477 int
1478 tmpfs_reclaim(struct vop_reclaim_args *v)
1479 {
1480 struct vnode *vp = v->a_vp;
1481 struct tmpfs_mount *tmp;
1482 struct tmpfs_node *node;
1483
1484 node = VP_TO_TMPFS_NODE(vp);
1485 tmp = VFS_TO_TMPFS(vp->v_mount);
1486
1487 tmpfs_free_vp(vp);
1488
1489 /* If the node referenced by this vnode was deleted by the user,
1490 * we must free its associated data structures (now that the vnode
1491 * is being reclaimed). */
1492 TMPFS_NODE_LOCK(node);
1493 if (node->tn_links == 0 &&
1494 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1495 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1496 tmpfs_free_node(tmp, node);
1497 /* eats the lock */
1498 } else {
1499 TMPFS_NODE_UNLOCK(node);
1500 }
1501
1502 KKASSERT(vp->v_data == NULL);
1503 return 0;
1504 }
1505
1506 /* --------------------------------------------------------------------- */
1507
1508 static int
1509 tmpfs_print(struct vop_print_args *v)
1510 {
1511 struct vnode *vp = v->a_vp;
1512
1513 struct tmpfs_node *node;
1514
1515 node = VP_TO_TMPFS_NODE(vp);
1516
1517 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1518 node, node->tn_flags, node->tn_links);
1519 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n",
1520 node->tn_mode, node->tn_uid, node->tn_gid,
1521 (uintmax_t)node->tn_size, node->tn_status);
1522
1523 if (vp->v_type == VFIFO)
1524 fifo_printinfo(vp);
1525
1526 kprintf("\n");
1527
1528 return 0;
1529 }
1530
1531 /* --------------------------------------------------------------------- */
1532
1533 static int
1534 tmpfs_pathconf(struct vop_pathconf_args *v)
1535 {
1536 int name = v->a_name;
1537 register_t *retval = v->a_retval;
1538
1539 int error;
1540
1541 error = 0;
1542
1543 switch (name) {
1544 case _PC_LINK_MAX:
1545 *retval = LINK_MAX;
1546 break;
1547
1548 case _PC_NAME_MAX:
1549 *retval = NAME_MAX;
1550 break;
1551
1552 case _PC_PATH_MAX:
1553 *retval = PATH_MAX;
1554 break;
1555
1556 case _PC_PIPE_BUF:
1557 *retval = PIPE_BUF;
1558 break;
1559
1560 case _PC_CHOWN_RESTRICTED:
1561 *retval = 1;
1562 break;
1563
1564 case _PC_NO_TRUNC:
1565 *retval = 1;
1566 break;
1567
1568 case _PC_SYNC_IO:
1569 *retval = 1;
1570 break;
1571
1572 case _PC_FILESIZEBITS:
1573 *retval = 0; /* XXX Don't know which value should I return. */
1574 break;
1575
1576 default:
1577 error = EINVAL;
1578 }
1579
1580 return error;
1581 }
1582
1583 /* --------------------------------------------------------------------- */
1584
1585 /*
1586 * vnode operations vector used for files stored in a tmpfs file system.
1587 */
1588 struct vop_ops tmpfs_vnode_vops = {
1589 .vop_default = vop_defaultop,
1590 .vop_getpages = vop_stdgetpages,
1591 .vop_putpages = vop_stdputpages,
1592 .vop_ncreate = tmpfs_ncreate,
1593 .vop_nresolve = tmpfs_nresolve,
1594 .vop_nlookupdotdot = tmpfs_nlookupdotdot,
1595 .vop_nmknod = tmpfs_nmknod,
1596 .vop_open = tmpfs_open,
1597 .vop_close = tmpfs_close,
1598 .vop_access = tmpfs_access,
1599 .vop_getattr = tmpfs_getattr,
1600 .vop_setattr = tmpfs_setattr,
1601 .vop_read = tmpfs_read,
1602 .vop_write = tmpfs_write,
1603 .vop_fsync = tmpfs_fsync,
1604 .vop_nremove = tmpfs_nremove,
1605 .vop_nlink = tmpfs_nlink,
1606 .vop_nrename = tmpfs_nrename,
1607 .vop_nmkdir = tmpfs_nmkdir,
1608 .vop_nrmdir = tmpfs_nrmdir,
1609 .vop_nsymlink = tmpfs_nsymlink,
1610 .vop_readdir = tmpfs_readdir,
1611 .vop_readlink = tmpfs_readlink,
1612 .vop_inactive = tmpfs_inactive,
1613 .vop_reclaim = tmpfs_reclaim,
1614 .vop_print = tmpfs_print,
1615 .vop_pathconf = tmpfs_pathconf,
1616 .vop_bmap = tmpfs_bmap,
1617 .vop_bmap = (void *)vop_eopnotsupp,
1618 .vop_strategy = tmpfs_strategy,
1619 .vop_advlock = tmpfs_advlock,
1620 };
DragonFly BSD