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/namei.h>
43 #include <sys/priv.h>
44 #include <sys/proc.h>
45 #include <sys/sched.h>
46 #include <sys/sf_buf.h>
47 #include <sys/stat.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
50 #include <sys/unistd.h>
51 #include <sys/vnode.h>
52
53 #include <vm/vm.h>
54 #include <vm/vm_param.h>
55 #include <vm/vm_object.h>
56 #include <vm/vm_page.h>
57 #include <vm/vm_pager.h>
58
59 #include <machine/_inttypes.h>
60
61 #include <fs/fifofs/fifo.h>
62 #include <fs/tmpfs/tmpfs_vnops.h>
63 #include <fs/tmpfs/tmpfs.h>
64
65 SYSCTL_DECL(_vfs_tmpfs);
66
67 static volatile int tmpfs_rename_restarts;
68 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
69 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
70 "Times rename had to restart due to lock contention");
71
72 /* --------------------------------------------------------------------- */
73
74 static int
75 tmpfs_lookup(struct vop_cachedlookup_args *v)
76 {
77 struct vnode *dvp = v->a_dvp;
78 struct vnode **vpp = v->a_vpp;
79 struct componentname *cnp = v->a_cnp;
80
81 int error;
82 struct tmpfs_dirent *de;
83 struct tmpfs_node *dnode;
84
85 dnode = VP_TO_TMPFS_DIR(dvp);
86 *vpp = NULLVP;
87
88 /* Check accessibility of requested node as a first step. */
89 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
90 if (error != 0)
91 goto out;
92
93 /* We cannot be requesting the parent directory of the root node. */
94 MPASS(IMPLIES(dnode->tn_type == VDIR &&
95 dnode->tn_dir.tn_parent == dnode,
96 !(cnp->cn_flags & ISDOTDOT)));
97
98 TMPFS_ASSERT_LOCKED(dnode);
99 if (dnode->tn_dir.tn_parent == NULL) {
100 error = ENOENT;
101 goto out;
102 }
103 if (cnp->cn_flags & ISDOTDOT) {
104 int ltype = 0;
105
106 ltype = VOP_ISLOCKED(dvp);
107 vhold(dvp);
108 VOP_UNLOCK(dvp, 0);
109 /* Allocate a new vnode on the matching entry. */
110 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
111 cnp->cn_lkflags, vpp);
112
113 vn_lock(dvp, ltype | LK_RETRY);
114 vdrop(dvp);
115 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
116 VREF(dvp);
117 *vpp = dvp;
118 error = 0;
119 } else {
120 de = tmpfs_dir_lookup(dnode, NULL, cnp);
121 if (de != NULL && de->td_node == NULL)
122 cnp->cn_flags |= ISWHITEOUT;
123 if (de == NULL || de->td_node == NULL) {
124 /* The entry was not found in the directory.
125 * This is OK if we are creating or renaming an
126 * entry and are working on the last component of
127 * the path name. */
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 /* Keep the component name in the buffer for
140 * future uses. */
141 cnp->cn_flags |= SAVENAME;
142
143 error = EJUSTRETURN;
144 } else
145 error = ENOENT;
146 } else {
147 struct tmpfs_node *tnode;
148
149 /* The entry was found, so get its associated
150 * tmpfs_node. */
151 tnode = de->td_node;
152
153 /* If we are not at the last path component and
154 * found a non-directory or non-link entry (which
155 * may itself be pointing to a directory), raise
156 * an error. */
157 if ((tnode->tn_type != VDIR &&
158 tnode->tn_type != VLNK) &&
159 !(cnp->cn_flags & ISLASTCN)) {
160 error = ENOTDIR;
161 goto out;
162 }
163
164 /* If we are deleting or renaming the entry, keep
165 * track of its tmpfs_dirent so that it can be
166 * easily deleted later. */
167 if ((cnp->cn_flags & ISLASTCN) &&
168 (cnp->cn_nameiop == DELETE ||
169 cnp->cn_nameiop == RENAME)) {
170 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
171 cnp->cn_thread);
172 if (error != 0)
173 goto out;
174
175 /* Allocate a new vnode on the matching entry. */
176 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
177 cnp->cn_lkflags, vpp);
178 if (error != 0)
179 goto out;
180
181 if ((dnode->tn_mode & S_ISTXT) &&
182 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
183 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
184 error = EPERM;
185 vput(*vpp);
186 *vpp = NULL;
187 goto out;
188 }
189 cnp->cn_flags |= SAVENAME;
190 } else {
191 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
192 cnp->cn_lkflags, vpp);
193 }
194 }
195 }
196
197 /* Store the result of this lookup in the cache. Avoid this if the
198 * request was for creation, as it does not improve timings on
199 * emprical tests. */
200 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE)
201 cache_enter(dvp, *vpp, cnp);
202
203 out:
204 /* If there were no errors, *vpp cannot be null and it must be
205 * locked. */
206 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
207
208 return error;
209 }
210
211 /* --------------------------------------------------------------------- */
212
213 static int
214 tmpfs_create(struct vop_create_args *v)
215 {
216 struct vnode *dvp = v->a_dvp;
217 struct vnode **vpp = v->a_vpp;
218 struct componentname *cnp = v->a_cnp;
219 struct vattr *vap = v->a_vap;
220
221 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
222
223 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
224 }
225 /* --------------------------------------------------------------------- */
226
227 static int
228 tmpfs_mknod(struct vop_mknod_args *v)
229 {
230 struct vnode *dvp = v->a_dvp;
231 struct vnode **vpp = v->a_vpp;
232 struct componentname *cnp = v->a_cnp;
233 struct vattr *vap = v->a_vap;
234
235 if (vap->va_type != VBLK && vap->va_type != VCHR &&
236 vap->va_type != VFIFO)
237 return EINVAL;
238
239 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
240 }
241
242 /* --------------------------------------------------------------------- */
243
244 static int
245 tmpfs_open(struct vop_open_args *v)
246 {
247 struct vnode *vp = v->a_vp;
248 int mode = v->a_mode;
249
250 int error;
251 struct tmpfs_node *node;
252
253 MPASS(VOP_ISLOCKED(vp));
254
255 node = VP_TO_TMPFS_NODE(vp);
256
257 /* The file is still active but all its names have been removed
258 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
259 * it is about to die. */
260 if (node->tn_links < 1)
261 return (ENOENT);
262
263 /* If the file is marked append-only, deny write requests. */
264 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
265 error = EPERM;
266 else {
267 error = 0;
268 vnode_create_vobject(vp, node->tn_size, v->a_td);
269 }
270
271 MPASS(VOP_ISLOCKED(vp));
272 return error;
273 }
274
275 /* --------------------------------------------------------------------- */
276
277 static int
278 tmpfs_close(struct vop_close_args *v)
279 {
280 struct vnode *vp = v->a_vp;
281
282 MPASS(VOP_ISLOCKED(vp));
283
284 /* Update node times. */
285 tmpfs_update(vp);
286
287 return (0);
288 }
289
290 /* --------------------------------------------------------------------- */
291
292 int
293 tmpfs_access(struct vop_access_args *v)
294 {
295 struct vnode *vp = v->a_vp;
296 accmode_t accmode = v->a_accmode;
297 struct ucred *cred = v->a_cred;
298
299 int error;
300 struct tmpfs_node *node;
301
302 MPASS(VOP_ISLOCKED(vp));
303
304 node = VP_TO_TMPFS_NODE(vp);
305
306 switch (vp->v_type) {
307 case VDIR:
308 /* FALLTHROUGH */
309 case VLNK:
310 /* FALLTHROUGH */
311 case VREG:
312 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
313 error = EROFS;
314 goto out;
315 }
316 break;
317
318 case VBLK:
319 /* FALLTHROUGH */
320 case VCHR:
321 /* FALLTHROUGH */
322 case VSOCK:
323 /* FALLTHROUGH */
324 case VFIFO:
325 break;
326
327 default:
328 error = EINVAL;
329 goto out;
330 }
331
332 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
333 error = EPERM;
334 goto out;
335 }
336
337 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
338 node->tn_gid, accmode, cred, NULL);
339
340 out:
341 MPASS(VOP_ISLOCKED(vp));
342
343 return error;
344 }
345
346 /* --------------------------------------------------------------------- */
347
348 int
349 tmpfs_getattr(struct vop_getattr_args *v)
350 {
351 struct vnode *vp = v->a_vp;
352 struct vattr *vap = v->a_vap;
353
354 struct tmpfs_node *node;
355
356 node = VP_TO_TMPFS_NODE(vp);
357
358 tmpfs_update(vp);
359
360 vap->va_type = vp->v_type;
361 vap->va_mode = node->tn_mode;
362 vap->va_nlink = node->tn_links;
363 vap->va_uid = node->tn_uid;
364 vap->va_gid = node->tn_gid;
365 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
366 vap->va_fileid = node->tn_id;
367 vap->va_size = node->tn_size;
368 vap->va_blocksize = PAGE_SIZE;
369 vap->va_atime = node->tn_atime;
370 vap->va_mtime = node->tn_mtime;
371 vap->va_ctime = node->tn_ctime;
372 vap->va_birthtime = node->tn_birthtime;
373 vap->va_gen = node->tn_gen;
374 vap->va_flags = node->tn_flags;
375 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
376 node->tn_rdev : NODEV;
377 vap->va_bytes = round_page(node->tn_size);
378 vap->va_filerev = 0;
379
380 return 0;
381 }
382
383 /* --------------------------------------------------------------------- */
384
385 /* XXX Should this operation be atomic? I think it should, but code in
386 * XXX other places (e.g., ufs) doesn't seem to be... */
387 int
388 tmpfs_setattr(struct vop_setattr_args *v)
389 {
390 struct vnode *vp = v->a_vp;
391 struct vattr *vap = v->a_vap;
392 struct ucred *cred = v->a_cred;
393 struct thread *td = curthread;
394
395 int error;
396
397 MPASS(VOP_ISLOCKED(vp));
398
399 error = 0;
400
401 /* Abort if any unsettable attribute is given. */
402 if (vap->va_type != VNON ||
403 vap->va_nlink != VNOVAL ||
404 vap->va_fsid != VNOVAL ||
405 vap->va_fileid != VNOVAL ||
406 vap->va_blocksize != VNOVAL ||
407 vap->va_gen != VNOVAL ||
408 vap->va_rdev != VNOVAL ||
409 vap->va_bytes != VNOVAL)
410 error = EINVAL;
411
412 if (error == 0 && (vap->va_flags != VNOVAL))
413 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
414
415 if (error == 0 && (vap->va_size != VNOVAL))
416 error = tmpfs_chsize(vp, vap->va_size, cred, td);
417
418 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
419 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
420
421 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
422 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
423
424 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
425 vap->va_atime.tv_nsec != VNOVAL) ||
426 (vap->va_mtime.tv_sec != VNOVAL &&
427 vap->va_mtime.tv_nsec != VNOVAL) ||
428 (vap->va_birthtime.tv_sec != VNOVAL &&
429 vap->va_birthtime.tv_nsec != VNOVAL)))
430 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
431 &vap->va_birthtime, vap->va_vaflags, cred, td);
432
433 /* Update the node times. We give preference to the error codes
434 * generated by this function rather than the ones that may arise
435 * from tmpfs_update. */
436 tmpfs_update(vp);
437
438 MPASS(VOP_ISLOCKED(vp));
439
440 return error;
441 }
442
443 /* --------------------------------------------------------------------- */
444 static int
445 tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx,
446 vm_offset_t offset, size_t tlen, struct uio *uio)
447 {
448 vm_page_t m;
449 int error, rv;
450
451 VM_OBJECT_LOCK(tobj);
452 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED |
453 VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
454 if (m->valid != VM_PAGE_BITS_ALL) {
455 if (vm_pager_has_page(tobj, idx, NULL, NULL)) {
456 rv = vm_pager_get_pages(tobj, &m, 1, 0);
457 if (rv != VM_PAGER_OK) {
458 vm_page_lock(m);
459 vm_page_free(m);
460 vm_page_unlock(m);
461 VM_OBJECT_UNLOCK(tobj);
462 return (EIO);
463 }
464 } else
465 vm_page_zero_invalid(m, TRUE);
466 }
467 VM_OBJECT_UNLOCK(tobj);
468 error = uiomove_fromphys(&m, offset, tlen, uio);
469 VM_OBJECT_LOCK(tobj);
470 vm_page_lock(m);
471 vm_page_unwire(m, TRUE);
472 vm_page_unlock(m);
473 vm_page_wakeup(m);
474 VM_OBJECT_UNLOCK(tobj);
475
476 return (error);
477 }
478
479 static __inline int
480 tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx,
481 vm_offset_t offset, size_t tlen, void *buf)
482 {
483 struct uio uio;
484 struct iovec iov;
485
486 uio.uio_iovcnt = 1;
487 uio.uio_iov = &iov;
488 iov.iov_base = buf;
489 iov.iov_len = tlen;
490
491 uio.uio_offset = 0;
492 uio.uio_resid = tlen;
493 uio.uio_rw = UIO_READ;
494 uio.uio_segflg = UIO_SYSSPACE;
495 uio.uio_td = curthread;
496
497 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio));
498 }
499
500 static int
501 tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio)
502 {
503 struct sf_buf *sf;
504 vm_pindex_t idx;
505 vm_page_t m;
506 vm_offset_t offset;
507 off_t addr;
508 size_t tlen;
509 char *ma;
510 int error;
511
512 addr = uio->uio_offset;
513 idx = OFF_TO_IDX(addr);
514 offset = addr & PAGE_MASK;
515 tlen = MIN(PAGE_SIZE - offset, len);
516
517 if ((vobj == NULL) ||
518 (vobj->resident_page_count == 0 && vobj->cache == NULL))
519 goto nocache;
520
521 VM_OBJECT_LOCK(vobj);
522 lookupvpg:
523 if (((m = vm_page_lookup(vobj, idx)) != NULL) &&
524 vm_page_is_valid(m, offset, tlen)) {
525 if ((m->oflags & VPO_BUSY) != 0) {
526 /*
527 * Reference the page before unlocking and sleeping so
528 * that the page daemon is less likely to reclaim it.
529 */
530 vm_page_reference(m);
531 vm_page_sleep(m, "tmfsmr");
532 goto lookupvpg;
533 }
534 vm_page_busy(m);
535 VM_OBJECT_UNLOCK(vobj);
536 error = uiomove_fromphys(&m, offset, tlen, uio);
537 VM_OBJECT_LOCK(vobj);
538 vm_page_wakeup(m);
539 VM_OBJECT_UNLOCK(vobj);
540 return (error);
541 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) {
542 KASSERT(offset == 0,
543 ("unexpected offset in tmpfs_mappedread for sendfile"));
544 if ((m->oflags & VPO_BUSY) != 0) {
545 /*
546 * Reference the page before unlocking and sleeping so
547 * that the page daemon is less likely to reclaim it.
548 */
549 vm_page_reference(m);
550 vm_page_sleep(m, "tmfsmr");
551 goto lookupvpg;
552 }
553 vm_page_busy(m);
554 VM_OBJECT_UNLOCK(vobj);
555 sched_pin();
556 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
557 ma = (char *)sf_buf_kva(sf);
558 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma);
559 if (error == 0) {
560 if (tlen != PAGE_SIZE)
561 bzero(ma + tlen, PAGE_SIZE - tlen);
562 uio->uio_offset += tlen;
563 uio->uio_resid -= tlen;
564 }
565 sf_buf_free(sf);
566 sched_unpin();
567 VM_OBJECT_LOCK(vobj);
568 if (error == 0)
569 m->valid = VM_PAGE_BITS_ALL;
570 vm_page_wakeup(m);
571 VM_OBJECT_UNLOCK(vobj);
572 return (error);
573 }
574 VM_OBJECT_UNLOCK(vobj);
575 nocache:
576 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio);
577
578 return (error);
579 }
580
581 static int
582 tmpfs_read(struct vop_read_args *v)
583 {
584 struct vnode *vp = v->a_vp;
585 struct uio *uio = v->a_uio;
586
587 struct tmpfs_node *node;
588 vm_object_t uobj;
589 size_t len;
590 int resid;
591
592 int error = 0;
593
594 node = VP_TO_TMPFS_NODE(vp);
595
596 if (vp->v_type != VREG) {
597 error = EISDIR;
598 goto out;
599 }
600
601 if (uio->uio_offset < 0) {
602 error = EINVAL;
603 goto out;
604 }
605
606 node->tn_status |= TMPFS_NODE_ACCESSED;
607
608 uobj = node->tn_reg.tn_aobj;
609 while ((resid = uio->uio_resid) > 0) {
610 error = 0;
611 if (node->tn_size <= uio->uio_offset)
612 break;
613 len = MIN(node->tn_size - uio->uio_offset, resid);
614 if (len == 0)
615 break;
616 error = tmpfs_mappedread(vp->v_object, uobj, len, uio);
617 if ((error != 0) || (resid == uio->uio_resid))
618 break;
619 }
620
621 out:
622
623 return error;
624 }
625
626 /* --------------------------------------------------------------------- */
627
628 static int
629 tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio)
630 {
631 vm_pindex_t idx;
632 vm_page_t vpg, tpg;
633 vm_offset_t offset;
634 off_t addr;
635 size_t tlen;
636 int error, rv;
637
638 error = 0;
639
640 addr = uio->uio_offset;
641 idx = OFF_TO_IDX(addr);
642 offset = addr & PAGE_MASK;
643 tlen = MIN(PAGE_SIZE - offset, len);
644
645 if ((vobj == NULL) ||
646 (vobj->resident_page_count == 0 && vobj->cache == NULL)) {
647 vpg = NULL;
648 goto nocache;
649 }
650
651 VM_OBJECT_LOCK(vobj);
652 lookupvpg:
653 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) &&
654 vm_page_is_valid(vpg, offset, tlen)) {
655 if ((vpg->oflags & VPO_BUSY) != 0) {
656 /*
657 * Reference the page before unlocking and sleeping so
658 * that the page daemon is less likely to reclaim it.
659 */
660 vm_page_reference(vpg);
661 vm_page_sleep(vpg, "tmfsmw");
662 goto lookupvpg;
663 }
664 vm_page_busy(vpg);
665 vm_page_undirty(vpg);
666 VM_OBJECT_UNLOCK(vobj);
667 error = uiomove_fromphys(&vpg, offset, tlen, uio);
668 } else {
669 if (__predict_false(vobj->cache != NULL))
670 vm_page_cache_free(vobj, idx, idx + 1);
671 VM_OBJECT_UNLOCK(vobj);
672 vpg = NULL;
673 }
674 nocache:
675 VM_OBJECT_LOCK(tobj);
676 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED |
677 VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
678 if (tpg->valid != VM_PAGE_BITS_ALL) {
679 if (vm_pager_has_page(tobj, idx, NULL, NULL)) {
680 rv = vm_pager_get_pages(tobj, &tpg, 1, 0);
681 if (rv != VM_PAGER_OK) {
682 vm_page_lock(tpg);
683 vm_page_free(tpg);
684 vm_page_unlock(tpg);
685 error = EIO;
686 goto out;
687 }
688 } else
689 vm_page_zero_invalid(tpg, TRUE);
690 }
691 VM_OBJECT_UNLOCK(tobj);
692 if (vpg == NULL)
693 error = uiomove_fromphys(&tpg, offset, tlen, uio);
694 else {
695 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid"));
696 pmap_copy_page(vpg, tpg);
697 }
698 VM_OBJECT_LOCK(tobj);
699 if (error == 0) {
700 KASSERT(tpg->valid == VM_PAGE_BITS_ALL,
701 ("parts of tpg invalid"));
702 vm_page_dirty(tpg);
703 }
704 vm_page_lock(tpg);
705 vm_page_unwire(tpg, TRUE);
706 vm_page_unlock(tpg);
707 vm_page_wakeup(tpg);
708 out:
709 VM_OBJECT_UNLOCK(tobj);
710 if (vpg != NULL) {
711 VM_OBJECT_LOCK(vobj);
712 vm_page_wakeup(vpg);
713 VM_OBJECT_UNLOCK(vobj);
714 }
715
716 return (error);
717 }
718
719 static int
720 tmpfs_write(struct vop_write_args *v)
721 {
722 struct vnode *vp = v->a_vp;
723 struct uio *uio = v->a_uio;
724 int ioflag = v->a_ioflag;
725
726 boolean_t extended;
727 int error = 0;
728 off_t oldsize;
729 struct tmpfs_node *node;
730 vm_object_t uobj;
731 size_t len;
732 int resid;
733
734 node = VP_TO_TMPFS_NODE(vp);
735 oldsize = node->tn_size;
736
737 if (uio->uio_offset < 0 || vp->v_type != VREG) {
738 error = EINVAL;
739 goto out;
740 }
741
742 if (uio->uio_resid == 0) {
743 error = 0;
744 goto out;
745 }
746
747 if (ioflag & IO_APPEND)
748 uio->uio_offset = node->tn_size;
749
750 if (uio->uio_offset + uio->uio_resid >
751 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
752 return (EFBIG);
753
754 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
755 return (EFBIG);
756
757 extended = uio->uio_offset + uio->uio_resid > node->tn_size;
758 if (extended) {
759 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
760 FALSE);
761 if (error != 0)
762 goto out;
763 }
764
765 uobj = node->tn_reg.tn_aobj;
766 while ((resid = uio->uio_resid) > 0) {
767 if (node->tn_size <= uio->uio_offset)
768 break;
769 len = MIN(node->tn_size - uio->uio_offset, resid);
770 if (len == 0)
771 break;
772 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio);
773 if ((error != 0) || (resid == uio->uio_resid))
774 break;
775 }
776
777 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
778 (extended ? TMPFS_NODE_CHANGED : 0);
779
780 if (node->tn_mode & (S_ISUID | S_ISGID)) {
781 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
782 node->tn_mode &= ~(S_ISUID | S_ISGID);
783 }
784
785 if (error != 0)
786 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
787
788 out:
789 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
790 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
791
792 return error;
793 }
794
795 /* --------------------------------------------------------------------- */
796
797 static int
798 tmpfs_fsync(struct vop_fsync_args *v)
799 {
800 struct vnode *vp = v->a_vp;
801
802 MPASS(VOP_ISLOCKED(vp));
803
804 tmpfs_update(vp);
805
806 return 0;
807 }
808
809 /* --------------------------------------------------------------------- */
810
811 static int
812 tmpfs_remove(struct vop_remove_args *v)
813 {
814 struct vnode *dvp = v->a_dvp;
815 struct vnode *vp = v->a_vp;
816
817 int error;
818 struct tmpfs_dirent *de;
819 struct tmpfs_mount *tmp;
820 struct tmpfs_node *dnode;
821 struct tmpfs_node *node;
822
823 MPASS(VOP_ISLOCKED(dvp));
824 MPASS(VOP_ISLOCKED(vp));
825
826 if (vp->v_type == VDIR) {
827 error = EISDIR;
828 goto out;
829 }
830
831 dnode = VP_TO_TMPFS_DIR(dvp);
832 node = VP_TO_TMPFS_NODE(vp);
833 tmp = VFS_TO_TMPFS(vp->v_mount);
834 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
835 MPASS(de != NULL);
836
837 /* Files marked as immutable or append-only cannot be deleted. */
838 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
839 (dnode->tn_flags & APPEND)) {
840 error = EPERM;
841 goto out;
842 }
843
844 /* Remove the entry from the directory; as it is a file, we do not
845 * have to change the number of hard links of the directory. */
846 tmpfs_dir_detach(dvp, de);
847 if (v->a_cnp->cn_flags & DOWHITEOUT)
848 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
849
850 /* Free the directory entry we just deleted. Note that the node
851 * referred by it will not be removed until the vnode is really
852 * reclaimed. */
853 tmpfs_free_dirent(tmp, de, TRUE);
854
855 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
856 error = 0;
857
858 out:
859
860 return error;
861 }
862
863 /* --------------------------------------------------------------------- */
864
865 static int
866 tmpfs_link(struct vop_link_args *v)
867 {
868 struct vnode *dvp = v->a_tdvp;
869 struct vnode *vp = v->a_vp;
870 struct componentname *cnp = v->a_cnp;
871
872 int error;
873 struct tmpfs_dirent *de;
874 struct tmpfs_node *node;
875
876 MPASS(VOP_ISLOCKED(dvp));
877 MPASS(cnp->cn_flags & HASBUF);
878 MPASS(dvp != vp); /* XXX When can this be false? */
879
880 node = VP_TO_TMPFS_NODE(vp);
881
882 /* XXX: Why aren't the following two tests done by the caller? */
883
884 /* Hard links of directories are forbidden. */
885 if (vp->v_type == VDIR) {
886 error = EPERM;
887 goto out;
888 }
889
890 /* Cannot create cross-device links. */
891 if (dvp->v_mount != vp->v_mount) {
892 error = EXDEV;
893 goto out;
894 }
895
896 /* Ensure that we do not overflow the maximum number of links imposed
897 * by the system. */
898 MPASS(node->tn_links <= LINK_MAX);
899 if (node->tn_links == LINK_MAX) {
900 error = EMLINK;
901 goto out;
902 }
903
904 /* We cannot create links of files marked immutable or append-only. */
905 if (node->tn_flags & (IMMUTABLE | APPEND)) {
906 error = EPERM;
907 goto out;
908 }
909
910 /* Allocate a new directory entry to represent the node. */
911 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
912 cnp->cn_nameptr, cnp->cn_namelen, &de);
913 if (error != 0)
914 goto out;
915
916 /* Insert the new directory entry into the appropriate directory. */
917 if (cnp->cn_flags & ISWHITEOUT)
918 tmpfs_dir_whiteout_remove(dvp, cnp);
919 tmpfs_dir_attach(dvp, de);
920
921 /* vp link count has changed, so update node times. */
922 node->tn_status |= TMPFS_NODE_CHANGED;
923 tmpfs_update(vp);
924
925 error = 0;
926
927 out:
928 return error;
929 }
930
931 /* --------------------------------------------------------------------- */
932
933 /*
934 * We acquire all but fdvp locks using non-blocking acquisitions. If we
935 * fail to acquire any lock in the path we will drop all held locks,
936 * acquire the new lock in a blocking fashion, and then release it and
937 * restart the rename. This acquire/release step ensures that we do not
938 * spin on a lock waiting for release. On error release all vnode locks
939 * and decrement references the way tmpfs_rename() would do.
940 */
941 static int
942 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
943 struct vnode *tdvp, struct vnode **tvpp,
944 struct componentname *fcnp, struct componentname *tcnp)
945 {
946 struct vnode *nvp;
947 struct mount *mp;
948 struct tmpfs_dirent *de;
949 int error, restarts = 0;
950
951 VOP_UNLOCK(tdvp, 0);
952 if (*tvpp != NULL && *tvpp != tdvp)
953 VOP_UNLOCK(*tvpp, 0);
954 mp = fdvp->v_mount;
955
956 relock:
957 restarts += 1;
958 error = vn_lock(fdvp, LK_EXCLUSIVE);
959 if (error)
960 goto releout;
961 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
962 VOP_UNLOCK(fdvp, 0);
963 error = vn_lock(tdvp, LK_EXCLUSIVE);
964 if (error)
965 goto releout;
966 VOP_UNLOCK(tdvp, 0);
967 goto relock;
968 }
969 /*
970 * Re-resolve fvp to be certain it still exists and fetch the
971 * correct vnode.
972 */
973 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
974 if (de == NULL) {
975 VOP_UNLOCK(fdvp, 0);
976 VOP_UNLOCK(tdvp, 0);
977 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
978 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
979 error = EINVAL;
980 else
981 error = ENOENT;
982 goto releout;
983 }
984 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
985 if (error != 0) {
986 VOP_UNLOCK(fdvp, 0);
987 VOP_UNLOCK(tdvp, 0);
988 if (error != EBUSY)
989 goto releout;
990 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
991 if (error != 0)
992 goto releout;
993 VOP_UNLOCK(nvp, 0);
994 /*
995 * Concurrent rename race.
996 */
997 if (nvp == tdvp) {
998 vrele(nvp);
999 error = EINVAL;
1000 goto releout;
1001 }
1002 vrele(*fvpp);
1003 *fvpp = nvp;
1004 goto relock;
1005 }
1006 vrele(*fvpp);
1007 *fvpp = nvp;
1008 VOP_UNLOCK(*fvpp, 0);
1009 /*
1010 * Re-resolve tvp and acquire the vnode lock if present.
1011 */
1012 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
1013 /*
1014 * If tvp disappeared we just carry on.
1015 */
1016 if (de == NULL && *tvpp != NULL) {
1017 vrele(*tvpp);
1018 *tvpp = NULL;
1019 }
1020 /*
1021 * Get the tvp ino if the lookup succeeded. We may have to restart
1022 * if the non-blocking acquire fails.
1023 */
1024 if (de != NULL) {
1025 nvp = NULL;
1026 error = tmpfs_alloc_vp(mp, de->td_node,
1027 LK_EXCLUSIVE | LK_NOWAIT, &nvp);
1028 if (*tvpp != NULL)
1029 vrele(*tvpp);
1030 *tvpp = nvp;
1031 if (error != 0) {
1032 VOP_UNLOCK(fdvp, 0);
1033 VOP_UNLOCK(tdvp, 0);
1034 if (error != EBUSY)
1035 goto releout;
1036 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
1037 &nvp);
1038 if (error != 0)
1039 goto releout;
1040 VOP_UNLOCK(nvp, 0);
1041 /*
1042 * fdvp contains fvp, thus tvp (=fdvp) is not empty.
1043 */
1044 if (nvp == fdvp) {
1045 error = ENOTEMPTY;
1046 goto releout;
1047 }
1048 goto relock;
1049 }
1050 }
1051 tmpfs_rename_restarts += restarts;
1052
1053 return (0);
1054
1055 releout:
1056 vrele(fdvp);
1057 vrele(*fvpp);
1058 vrele(tdvp);
1059 if (*tvpp != NULL)
1060 vrele(*tvpp);
1061 tmpfs_rename_restarts += restarts;
1062
1063 return (error);
1064 }
1065
1066 static int
1067 tmpfs_rename(struct vop_rename_args *v)
1068 {
1069 struct vnode *fdvp = v->a_fdvp;
1070 struct vnode *fvp = v->a_fvp;
1071 struct componentname *fcnp = v->a_fcnp;
1072 struct vnode *tdvp = v->a_tdvp;
1073 struct vnode *tvp = v->a_tvp;
1074 struct componentname *tcnp = v->a_tcnp;
1075 struct mount *mp = NULL;
1076
1077 char *newname;
1078 int error;
1079 struct tmpfs_dirent *de;
1080 struct tmpfs_mount *tmp;
1081 struct tmpfs_node *fdnode;
1082 struct tmpfs_node *fnode;
1083 struct tmpfs_node *tnode;
1084 struct tmpfs_node *tdnode;
1085
1086 MPASS(VOP_ISLOCKED(tdvp));
1087 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
1088 MPASS(fcnp->cn_flags & HASBUF);
1089 MPASS(tcnp->cn_flags & HASBUF);
1090
1091 /* Disallow cross-device renames.
1092 * XXX Why isn't this done by the caller? */
1093 if (fvp->v_mount != tdvp->v_mount ||
1094 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
1095 error = EXDEV;
1096 goto out;
1097 }
1098
1099 /* If source and target are the same file, there is nothing to do. */
1100 if (fvp == tvp) {
1101 error = 0;
1102 goto out;
1103 }
1104
1105 /* If we need to move the directory between entries, lock the
1106 * source so that we can safely operate on it. */
1107 if (fdvp != tdvp && fdvp != tvp) {
1108 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1109 mp = tdvp->v_mount;
1110 error = vfs_busy(mp, 0);
1111 if (error != 0) {
1112 mp = NULL;
1113 goto out;
1114 }
1115 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
1116 fcnp, tcnp);
1117 if (error != 0) {
1118 vfs_unbusy(mp);
1119 return (error);
1120 }
1121 ASSERT_VOP_ELOCKED(fdvp,
1122 "tmpfs_rename: fdvp not locked");
1123 ASSERT_VOP_ELOCKED(tdvp,
1124 "tmpfs_rename: tdvp not locked");
1125 if (tvp != NULL)
1126 ASSERT_VOP_ELOCKED(tvp,
1127 "tmpfs_rename: tvp not locked");
1128 if (fvp == tvp) {
1129 error = 0;
1130 goto out_locked;
1131 }
1132 }
1133 }
1134
1135 tmp = VFS_TO_TMPFS(tdvp->v_mount);
1136 tdnode = VP_TO_TMPFS_DIR(tdvp);
1137 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
1138 fdnode = VP_TO_TMPFS_DIR(fdvp);
1139 fnode = VP_TO_TMPFS_NODE(fvp);
1140 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
1141
1142 /* Entry can disappear before we lock fdvp,
1143 * also avoid manipulating '.' and '..' entries. */
1144 if (de == NULL) {
1145 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
1146 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
1147 error = EINVAL;
1148 else
1149 error = ENOENT;
1150 goto out_locked;
1151 }
1152 MPASS(de->td_node == fnode);
1153
1154 /* If re-naming a directory to another preexisting directory
1155 * ensure that the target directory is empty so that its
1156 * removal causes no side effects.
1157 * Kern_rename gurantees the destination to be a directory
1158 * if the source is one. */
1159 if (tvp != NULL) {
1160 MPASS(tnode != NULL);
1161
1162 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
1163 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
1164 error = EPERM;
1165 goto out_locked;
1166 }
1167
1168 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
1169 if (tnode->tn_size > 0) {
1170 error = ENOTEMPTY;
1171 goto out_locked;
1172 }
1173 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1174 error = ENOTDIR;
1175 goto out_locked;
1176 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1177 error = EISDIR;
1178 goto out_locked;
1179 } else {
1180 MPASS(fnode->tn_type != VDIR &&
1181 tnode->tn_type != VDIR);
1182 }
1183 }
1184
1185 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
1186 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1187 error = EPERM;
1188 goto out_locked;
1189 }
1190
1191 /* Ensure that we have enough memory to hold the new name, if it
1192 * has to be changed. */
1193 if (fcnp->cn_namelen != tcnp->cn_namelen ||
1194 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
1195 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
1196 } else
1197 newname = NULL;
1198
1199 /* If the node is being moved to another directory, we have to do
1200 * the move. */
1201 if (fdnode != tdnode) {
1202 /* In case we are moving a directory, we have to adjust its
1203 * parent to point to the new parent. */
1204 if (de->td_node->tn_type == VDIR) {
1205 struct tmpfs_node *n;
1206
1207 /* Ensure the target directory is not a child of the
1208 * directory being moved. Otherwise, we'd end up
1209 * with stale nodes. */
1210 n = tdnode;
1211 /* TMPFS_LOCK garanties that no nodes are freed while
1212 * traversing the list. Nodes can only be marked as
1213 * removed: tn_parent == NULL. */
1214 TMPFS_LOCK(tmp);
1215 TMPFS_NODE_LOCK(n);
1216 while (n != n->tn_dir.tn_parent) {
1217 struct tmpfs_node *parent;
1218
1219 if (n == fnode) {
1220 TMPFS_NODE_UNLOCK(n);
1221 TMPFS_UNLOCK(tmp);
1222 error = EINVAL;
1223 if (newname != NULL)
1224 free(newname, M_TMPFSNAME);
1225 goto out_locked;
1226 }
1227 parent = n->tn_dir.tn_parent;
1228 TMPFS_NODE_UNLOCK(n);
1229 if (parent == NULL) {
1230 n = NULL;
1231 break;
1232 }
1233 TMPFS_NODE_LOCK(parent);
1234 if (parent->tn_dir.tn_parent == NULL) {
1235 TMPFS_NODE_UNLOCK(parent);
1236 n = NULL;
1237 break;
1238 }
1239 n = parent;
1240 }
1241 TMPFS_UNLOCK(tmp);
1242 if (n == NULL) {
1243 error = EINVAL;
1244 if (newname != NULL)
1245 free(newname, M_TMPFSNAME);
1246 goto out_locked;
1247 }
1248 TMPFS_NODE_UNLOCK(n);
1249
1250 /* Adjust the parent pointer. */
1251 TMPFS_VALIDATE_DIR(fnode);
1252 TMPFS_NODE_LOCK(de->td_node);
1253 de->td_node->tn_dir.tn_parent = tdnode;
1254 TMPFS_NODE_UNLOCK(de->td_node);
1255
1256 /* As a result of changing the target of the '..'
1257 * entry, the link count of the source and target
1258 * directories has to be adjusted. */
1259 TMPFS_NODE_LOCK(tdnode);
1260 TMPFS_ASSERT_LOCKED(tdnode);
1261 tdnode->tn_links++;
1262 TMPFS_NODE_UNLOCK(tdnode);
1263
1264 TMPFS_NODE_LOCK(fdnode);
1265 TMPFS_ASSERT_LOCKED(fdnode);
1266 fdnode->tn_links--;
1267 TMPFS_NODE_UNLOCK(fdnode);
1268 }
1269
1270 /* Do the move: just remove the entry from the source directory
1271 * and insert it into the target one. */
1272 tmpfs_dir_detach(fdvp, de);
1273 if (fcnp->cn_flags & DOWHITEOUT)
1274 tmpfs_dir_whiteout_add(fdvp, fcnp);
1275 if (tcnp->cn_flags & ISWHITEOUT)
1276 tmpfs_dir_whiteout_remove(tdvp, tcnp);
1277 tmpfs_dir_attach(tdvp, de);
1278 }
1279
1280 /* If the name has changed, we need to make it effective by changing
1281 * it in the directory entry. */
1282 if (newname != NULL) {
1283 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
1284
1285 free(de->td_name, M_TMPFSNAME);
1286 de->td_namelen = (uint16_t)tcnp->cn_namelen;
1287 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen);
1288 de->td_name = newname;
1289
1290 fnode->tn_status |= TMPFS_NODE_CHANGED;
1291 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1292 }
1293
1294 /* If we are overwriting an entry, we have to remove the old one
1295 * from the target directory. */
1296 if (tvp != NULL) {
1297 /* Remove the old entry from the target directory. */
1298 de = tmpfs_dir_lookup(tdnode, tnode, tcnp);
1299 tmpfs_dir_detach(tdvp, de);
1300
1301 /* Free the directory entry we just deleted. Note that the
1302 * node referred by it will not be removed until the vnode is
1303 * really reclaimed. */
1304 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE);
1305 }
1306 cache_purge(fvp);
1307 if (tvp != NULL)
1308 cache_purge(tvp);
1309 cache_purge_negative(tdvp);
1310
1311 error = 0;
1312
1313 out_locked:
1314 if (fdvp != tdvp && fdvp != tvp)
1315 VOP_UNLOCK(fdvp, 0);
1316
1317 out:
1318 /* Release target nodes. */
1319 /* XXX: I don't understand when tdvp can be the same as tvp, but
1320 * other code takes care of this... */
1321 if (tdvp == tvp)
1322 vrele(tdvp);
1323 else
1324 vput(tdvp);
1325 if (tvp != NULL)
1326 vput(tvp);
1327
1328 /* Release source nodes. */
1329 vrele(fdvp);
1330 vrele(fvp);
1331
1332 if (mp != NULL)
1333 vfs_unbusy(mp);
1334
1335 return error;
1336 }
1337
1338 /* --------------------------------------------------------------------- */
1339
1340 static int
1341 tmpfs_mkdir(struct vop_mkdir_args *v)
1342 {
1343 struct vnode *dvp = v->a_dvp;
1344 struct vnode **vpp = v->a_vpp;
1345 struct componentname *cnp = v->a_cnp;
1346 struct vattr *vap = v->a_vap;
1347
1348 MPASS(vap->va_type == VDIR);
1349
1350 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1351 }
1352
1353 /* --------------------------------------------------------------------- */
1354
1355 static int
1356 tmpfs_rmdir(struct vop_rmdir_args *v)
1357 {
1358 struct vnode *dvp = v->a_dvp;
1359 struct vnode *vp = v->a_vp;
1360
1361 int error;
1362 struct tmpfs_dirent *de;
1363 struct tmpfs_mount *tmp;
1364 struct tmpfs_node *dnode;
1365 struct tmpfs_node *node;
1366
1367 MPASS(VOP_ISLOCKED(dvp));
1368 MPASS(VOP_ISLOCKED(vp));
1369
1370 tmp = VFS_TO_TMPFS(dvp->v_mount);
1371 dnode = VP_TO_TMPFS_DIR(dvp);
1372 node = VP_TO_TMPFS_DIR(vp);
1373
1374 /* Directories with more than two entries ('.' and '..') cannot be
1375 * removed. */
1376 if (node->tn_size > 0) {
1377 error = ENOTEMPTY;
1378 goto out;
1379 }
1380
1381 if ((dnode->tn_flags & APPEND)
1382 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1383 error = EPERM;
1384 goto out;
1385 }
1386
1387 /* This invariant holds only if we are not trying to remove "..".
1388 * We checked for that above so this is safe now. */
1389 MPASS(node->tn_dir.tn_parent == dnode);
1390
1391 /* Get the directory entry associated with node (vp). This was
1392 * filled by tmpfs_lookup while looking up the entry. */
1393 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1394 MPASS(TMPFS_DIRENT_MATCHES(de,
1395 v->a_cnp->cn_nameptr,
1396 v->a_cnp->cn_namelen));
1397
1398 /* Check flags to see if we are allowed to remove the directory. */
1399 if (dnode->tn_flags & APPEND
1400 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1401 error = EPERM;
1402 goto out;
1403 }
1404
1405
1406 /* Detach the directory entry from the directory (dnode). */
1407 tmpfs_dir_detach(dvp, de);
1408 if (v->a_cnp->cn_flags & DOWHITEOUT)
1409 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1410
1411 /* No vnode should be allocated for this entry from this point */
1412 TMPFS_NODE_LOCK(node);
1413 TMPFS_ASSERT_ELOCKED(node);
1414 node->tn_links--;
1415 node->tn_dir.tn_parent = NULL;
1416 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1417 TMPFS_NODE_MODIFIED;
1418
1419 TMPFS_NODE_UNLOCK(node);
1420
1421 TMPFS_NODE_LOCK(dnode);
1422 TMPFS_ASSERT_ELOCKED(dnode);
1423 dnode->tn_links--;
1424 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1425 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1426 TMPFS_NODE_UNLOCK(dnode);
1427
1428 cache_purge(dvp);
1429 cache_purge(vp);
1430
1431 /* Free the directory entry we just deleted. Note that the node
1432 * referred by it will not be removed until the vnode is really
1433 * reclaimed. */
1434 tmpfs_free_dirent(tmp, de, TRUE);
1435
1436 /* Release the deleted vnode (will destroy the node, notify
1437 * interested parties and clean it from the cache). */
1438
1439 dnode->tn_status |= TMPFS_NODE_CHANGED;
1440 tmpfs_update(dvp);
1441
1442 error = 0;
1443
1444 out:
1445 return error;
1446 }
1447
1448 /* --------------------------------------------------------------------- */
1449
1450 static int
1451 tmpfs_symlink(struct vop_symlink_args *v)
1452 {
1453 struct vnode *dvp = v->a_dvp;
1454 struct vnode **vpp = v->a_vpp;
1455 struct componentname *cnp = v->a_cnp;
1456 struct vattr *vap = v->a_vap;
1457 char *target = v->a_target;
1458
1459 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1460 MPASS(vap->va_type == VLNK);
1461 #else
1462 vap->va_type = VLNK;
1463 #endif
1464
1465 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1466 }
1467
1468 /* --------------------------------------------------------------------- */
1469
1470 static int
1471 tmpfs_readdir(struct vop_readdir_args *v)
1472 {
1473 struct vnode *vp = v->a_vp;
1474 struct uio *uio = v->a_uio;
1475 int *eofflag = v->a_eofflag;
1476 u_long **cookies = v->a_cookies;
1477 int *ncookies = v->a_ncookies;
1478
1479 int error;
1480 off_t startoff;
1481 off_t cnt = 0;
1482 struct tmpfs_node *node;
1483
1484 /* This operation only makes sense on directory nodes. */
1485 if (vp->v_type != VDIR)
1486 return ENOTDIR;
1487
1488 node = VP_TO_TMPFS_DIR(vp);
1489
1490 startoff = uio->uio_offset;
1491
1492 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1493 error = tmpfs_dir_getdotdent(node, uio);
1494 if (error != 0)
1495 goto outok;
1496 cnt++;
1497 }
1498
1499 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1500 error = tmpfs_dir_getdotdotdent(node, uio);
1501 if (error != 0)
1502 goto outok;
1503 cnt++;
1504 }
1505
1506 error = tmpfs_dir_getdents(node, uio, &cnt);
1507
1508 outok:
1509 MPASS(error >= -1);
1510
1511 if (error == -1)
1512 error = (cnt != 0) ? 0 : EINVAL;
1513
1514 if (eofflag != NULL)
1515 *eofflag =
1516 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1517
1518 /* Update NFS-related variables. */
1519 if (error == 0 && cookies != NULL && ncookies != NULL) {
1520 off_t i;
1521 off_t off = startoff;
1522 struct tmpfs_dirent *de = NULL;
1523
1524 *ncookies = cnt;
1525 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1526
1527 for (i = 0; i < cnt; i++) {
1528 MPASS(off != TMPFS_DIRCOOKIE_EOF);
1529 if (off == TMPFS_DIRCOOKIE_DOT) {
1530 off = TMPFS_DIRCOOKIE_DOTDOT;
1531 } else {
1532 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1533 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
1534 } else if (de != NULL) {
1535 de = TAILQ_NEXT(de, td_entries);
1536 } else {
1537 de = tmpfs_dir_lookupbycookie(node,
1538 off);
1539 MPASS(de != NULL);
1540 de = TAILQ_NEXT(de, td_entries);
1541 }
1542 if (de == NULL)
1543 off = TMPFS_DIRCOOKIE_EOF;
1544 else
1545 off = tmpfs_dircookie(de);
1546 }
1547
1548 (*cookies)[i] = off;
1549 }
1550 MPASS(uio->uio_offset == off);
1551 }
1552
1553 return error;
1554 }
1555
1556 /* --------------------------------------------------------------------- */
1557
1558 static int
1559 tmpfs_readlink(struct vop_readlink_args *v)
1560 {
1561 struct vnode *vp = v->a_vp;
1562 struct uio *uio = v->a_uio;
1563
1564 int error;
1565 struct tmpfs_node *node;
1566
1567 MPASS(uio->uio_offset == 0);
1568 MPASS(vp->v_type == VLNK);
1569
1570 node = VP_TO_TMPFS_NODE(vp);
1571
1572 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1573 uio);
1574 node->tn_status |= TMPFS_NODE_ACCESSED;
1575
1576 return error;
1577 }
1578
1579 /* --------------------------------------------------------------------- */
1580
1581 static int
1582 tmpfs_inactive(struct vop_inactive_args *v)
1583 {
1584 struct vnode *vp = v->a_vp;
1585 struct thread *l = v->a_td;
1586
1587 struct tmpfs_node *node;
1588
1589 MPASS(VOP_ISLOCKED(vp));
1590
1591 node = VP_TO_TMPFS_NODE(vp);
1592
1593 if (node->tn_links == 0)
1594 vrecycle(vp, l);
1595
1596 return 0;
1597 }
1598
1599 /* --------------------------------------------------------------------- */
1600
1601 int
1602 tmpfs_reclaim(struct vop_reclaim_args *v)
1603 {
1604 struct vnode *vp = v->a_vp;
1605
1606 struct tmpfs_mount *tmp;
1607 struct tmpfs_node *node;
1608
1609 node = VP_TO_TMPFS_NODE(vp);
1610 tmp = VFS_TO_TMPFS(vp->v_mount);
1611
1612 vnode_destroy_vobject(vp);
1613 cache_purge(vp);
1614
1615 TMPFS_NODE_LOCK(node);
1616 TMPFS_ASSERT_ELOCKED(node);
1617 tmpfs_free_vp(vp);
1618
1619 /* If the node referenced by this vnode was deleted by the user,
1620 * we must free its associated data structures (now that the vnode
1621 * is being reclaimed). */
1622 if (node->tn_links == 0 &&
1623 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1624 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1625 TMPFS_NODE_UNLOCK(node);
1626 tmpfs_free_node(tmp, node);
1627 } else
1628 TMPFS_NODE_UNLOCK(node);
1629
1630 MPASS(vp->v_data == NULL);
1631 return 0;
1632 }
1633
1634 /* --------------------------------------------------------------------- */
1635
1636 static int
1637 tmpfs_print(struct vop_print_args *v)
1638 {
1639 struct vnode *vp = v->a_vp;
1640
1641 struct tmpfs_node *node;
1642
1643 node = VP_TO_TMPFS_NODE(vp);
1644
1645 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1646 node, node->tn_flags, node->tn_links);
1647 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX
1648 ", status 0x%x\n",
1649 node->tn_mode, node->tn_uid, node->tn_gid,
1650 (uintmax_t)node->tn_size, node->tn_status);
1651
1652 if (vp->v_type == VFIFO)
1653 fifo_printinfo(vp);
1654
1655 printf("\n");
1656
1657 return 0;
1658 }
1659
1660 /* --------------------------------------------------------------------- */
1661
1662 static int
1663 tmpfs_pathconf(struct vop_pathconf_args *v)
1664 {
1665 int name = v->a_name;
1666 register_t *retval = v->a_retval;
1667
1668 int error;
1669
1670 error = 0;
1671
1672 switch (name) {
1673 case _PC_LINK_MAX:
1674 *retval = LINK_MAX;
1675 break;
1676
1677 case _PC_NAME_MAX:
1678 *retval = NAME_MAX;
1679 break;
1680
1681 case _PC_PATH_MAX:
1682 *retval = PATH_MAX;
1683 break;
1684
1685 case _PC_PIPE_BUF:
1686 *retval = PIPE_BUF;
1687 break;
1688
1689 case _PC_CHOWN_RESTRICTED:
1690 *retval = 1;
1691 break;
1692
1693 case _PC_NO_TRUNC:
1694 *retval = 1;
1695 break;
1696
1697 case _PC_SYNC_IO:
1698 *retval = 1;
1699 break;
1700
1701 case _PC_FILESIZEBITS:
1702 *retval = 0; /* XXX Don't know which value should I return. */
1703 break;
1704
1705 default:
1706 error = EINVAL;
1707 }
1708
1709 return error;
1710 }
1711
1712 static int
1713 tmpfs_vptofh(struct vop_vptofh_args *ap)
1714 {
1715 struct tmpfs_fid *tfhp;
1716 struct tmpfs_node *node;
1717
1718 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1719 node = VP_TO_TMPFS_NODE(ap->a_vp);
1720
1721 tfhp->tf_len = sizeof(struct tmpfs_fid);
1722 tfhp->tf_id = node->tn_id;
1723 tfhp->tf_gen = node->tn_gen;
1724
1725 return (0);
1726 }
1727
1728 static int
1729 tmpfs_whiteout(struct vop_whiteout_args *ap)
1730 {
1731 struct vnode *dvp = ap->a_dvp;
1732 struct componentname *cnp = ap->a_cnp;
1733 struct tmpfs_dirent *de;
1734
1735 switch (ap->a_flags) {
1736 case LOOKUP:
1737 return (0);
1738 case CREATE:
1739 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1740 if (de != NULL)
1741 return (de->td_node == NULL ? 0 : EEXIST);
1742 return (tmpfs_dir_whiteout_add(dvp, cnp));
1743 case DELETE:
1744 tmpfs_dir_whiteout_remove(dvp, cnp);
1745 return (0);
1746 default:
1747 panic("tmpfs_whiteout: unknown op");
1748 }
1749 }
1750
1751 /* --------------------------------------------------------------------- */
1752
1753 /*
1754 * vnode operations vector used for files stored in a tmpfs file system.
1755 */
1756 struct vop_vector tmpfs_vnodeop_entries = {
1757 .vop_default = &default_vnodeops,
1758 .vop_lookup = vfs_cache_lookup,
1759 .vop_cachedlookup = tmpfs_lookup,
1760 .vop_create = tmpfs_create,
1761 .vop_mknod = tmpfs_mknod,
1762 .vop_open = tmpfs_open,
1763 .vop_close = tmpfs_close,
1764 .vop_access = tmpfs_access,
1765 .vop_getattr = tmpfs_getattr,
1766 .vop_setattr = tmpfs_setattr,
1767 .vop_read = tmpfs_read,
1768 .vop_write = tmpfs_write,
1769 .vop_fsync = tmpfs_fsync,
1770 .vop_remove = tmpfs_remove,
1771 .vop_link = tmpfs_link,
1772 .vop_rename = tmpfs_rename,
1773 .vop_mkdir = tmpfs_mkdir,
1774 .vop_rmdir = tmpfs_rmdir,
1775 .vop_symlink = tmpfs_symlink,
1776 .vop_readdir = tmpfs_readdir,
1777 .vop_readlink = tmpfs_readlink,
1778 .vop_inactive = tmpfs_inactive,
1779 .vop_reclaim = tmpfs_reclaim,
1780 .vop_print = tmpfs_print,
1781 .vop_pathconf = tmpfs_pathconf,
1782 .vop_vptofh = tmpfs_vptofh,
1783 .vop_whiteout = tmpfs_whiteout,
1784 .vop_bmap = VOP_EOPNOTSUPP,
1785 };
1786
Cache object: bac01607caebe65d4e5d15c840608015
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