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tmpfs_vnops.c (229130) tmpfs_vnops.c (229855)
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>
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/9/sys/fs/tmpfs/tmpfs_vnops.c 229130 2011-12-31 17:56:05Z pho $");
37__FBSDID("$FreeBSD: stable/9/sys/fs/tmpfs/tmpfs_vnops.c 229855 2012-01-09 13:35:10Z ivoras $");
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/unistd.h>
50#include <sys/vnode.h>
51
52#include <vm/vm.h>
53#include <vm/vm_object.h>
54#include <vm/vm_page.h>
55#include <vm/vm_pager.h>
56
57#include <machine/_inttypes.h>
58
59#include <fs/fifofs/fifo.h>
60#include <fs/tmpfs/tmpfs_vnops.h>
61#include <fs/tmpfs/tmpfs.h>
62
63/* --------------------------------------------------------------------- */
64
65static int
66tmpfs_lookup(struct vop_cachedlookup_args *v)
67{
68 struct vnode *dvp = v->a_dvp;
69 struct vnode **vpp = v->a_vpp;
70 struct componentname *cnp = v->a_cnp;
71
72 int error;
73 struct tmpfs_dirent *de;
74 struct tmpfs_node *dnode;
75
76 dnode = VP_TO_TMPFS_DIR(dvp);
77 *vpp = NULLVP;
78
79 /* Check accessibility of requested node as a first step. */
80 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
81 if (error != 0)
82 goto out;
83
84 /* We cannot be requesting the parent directory of the root node. */
85 MPASS(IMPLIES(dnode->tn_type == VDIR &&
86 dnode->tn_dir.tn_parent == dnode,
87 !(cnp->cn_flags & ISDOTDOT)));
88
89 TMPFS_ASSERT_LOCKED(dnode);
90 if (dnode->tn_dir.tn_parent == NULL) {
91 error = ENOENT;
92 goto out;
93 }
94 if (cnp->cn_flags & ISDOTDOT) {
95 int ltype = 0;
96
97 ltype = VOP_ISLOCKED(dvp);
98 vhold(dvp);
99 VOP_UNLOCK(dvp, 0);
100 /* Allocate a new vnode on the matching entry. */
101 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
102 cnp->cn_lkflags, vpp);
103
104 vn_lock(dvp, ltype | LK_RETRY);
105 vdrop(dvp);
106 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
107 VREF(dvp);
108 *vpp = dvp;
109 error = 0;
110 } else {
111 de = tmpfs_dir_lookup(dnode, NULL, cnp);
112 if (de != NULL && de->td_node == NULL)
113 cnp->cn_flags |= ISWHITEOUT;
114 if (de == NULL || de->td_node == NULL) {
115 /* The entry was not found in the directory.
116 * This is OK if we are creating or renaming an
117 * entry and are working on the last component of
118 * the path name. */
119 if ((cnp->cn_flags & ISLASTCN) &&
120 (cnp->cn_nameiop == CREATE || \
121 cnp->cn_nameiop == RENAME ||
122 (cnp->cn_nameiop == DELETE &&
123 cnp->cn_flags & DOWHITEOUT &&
124 cnp->cn_flags & ISWHITEOUT))) {
125 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
126 cnp->cn_thread);
127 if (error != 0)
128 goto out;
129
130 /* Keep the component name in the buffer for
131 * future uses. */
132 cnp->cn_flags |= SAVENAME;
133
134 error = EJUSTRETURN;
135 } else
136 error = ENOENT;
137 } else {
138 struct tmpfs_node *tnode;
139
140 /* The entry was found, so get its associated
141 * tmpfs_node. */
142 tnode = de->td_node;
143
144 /* If we are not at the last path component and
145 * found a non-directory or non-link entry (which
146 * may itself be pointing to a directory), raise
147 * an error. */
148 if ((tnode->tn_type != VDIR &&
149 tnode->tn_type != VLNK) &&
150 !(cnp->cn_flags & ISLASTCN)) {
151 error = ENOTDIR;
152 goto out;
153 }
154
155 /* If we are deleting or renaming the entry, keep
156 * track of its tmpfs_dirent so that it can be
157 * easily deleted later. */
158 if ((cnp->cn_flags & ISLASTCN) &&
159 (cnp->cn_nameiop == DELETE ||
160 cnp->cn_nameiop == RENAME)) {
161 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
162 cnp->cn_thread);
163 if (error != 0)
164 goto out;
165
166 /* Allocate a new vnode on the matching entry. */
167 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
168 cnp->cn_lkflags, vpp);
169 if (error != 0)
170 goto out;
171
172 if ((dnode->tn_mode & S_ISTXT) &&
173 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
174 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
175 error = EPERM;
176 vput(*vpp);
177 *vpp = NULL;
178 goto out;
179 }
180 cnp->cn_flags |= SAVENAME;
181 } else {
182 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
183 cnp->cn_lkflags, vpp);
184 }
185 }
186 }
187
188 /* Store the result of this lookup in the cache. Avoid this if the
189 * request was for creation, as it does not improve timings on
190 * emprical tests. */
191 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE)
192 cache_enter(dvp, *vpp, cnp);
193
194out:
195 /* If there were no errors, *vpp cannot be null and it must be
196 * locked. */
197 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
198
199 return error;
200}
201
202/* --------------------------------------------------------------------- */
203
204static int
205tmpfs_create(struct vop_create_args *v)
206{
207 struct vnode *dvp = v->a_dvp;
208 struct vnode **vpp = v->a_vpp;
209 struct componentname *cnp = v->a_cnp;
210 struct vattr *vap = v->a_vap;
211
212 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
213
214 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
215}
216/* --------------------------------------------------------------------- */
217
218static int
219tmpfs_mknod(struct vop_mknod_args *v)
220{
221 struct vnode *dvp = v->a_dvp;
222 struct vnode **vpp = v->a_vpp;
223 struct componentname *cnp = v->a_cnp;
224 struct vattr *vap = v->a_vap;
225
226 if (vap->va_type != VBLK && vap->va_type != VCHR &&
227 vap->va_type != VFIFO)
228 return EINVAL;
229
230 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
231}
232
233/* --------------------------------------------------------------------- */
234
235static int
236tmpfs_open(struct vop_open_args *v)
237{
238 struct vnode *vp = v->a_vp;
239 int mode = v->a_mode;
240
241 int error;
242 struct tmpfs_node *node;
243
244 MPASS(VOP_ISLOCKED(vp));
245
246 node = VP_TO_TMPFS_NODE(vp);
247
248 /* The file is still active but all its names have been removed
249 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
250 * it is about to die. */
251 if (node->tn_links < 1)
252 return (ENOENT);
253
254 /* If the file is marked append-only, deny write requests. */
255 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
256 error = EPERM;
257 else {
258 error = 0;
259 vnode_create_vobject(vp, node->tn_size, v->a_td);
260 }
261
262 MPASS(VOP_ISLOCKED(vp));
263 return error;
264}
265
266/* --------------------------------------------------------------------- */
267
268static int
269tmpfs_close(struct vop_close_args *v)
270{
271 struct vnode *vp = v->a_vp;
272
273 MPASS(VOP_ISLOCKED(vp));
274
275 /* Update node times. */
276 tmpfs_update(vp);
277
278 return (0);
279}
280
281/* --------------------------------------------------------------------- */
282
283int
284tmpfs_access(struct vop_access_args *v)
285{
286 struct vnode *vp = v->a_vp;
287 accmode_t accmode = v->a_accmode;
288 struct ucred *cred = v->a_cred;
289
290 int error;
291 struct tmpfs_node *node;
292
293 MPASS(VOP_ISLOCKED(vp));
294
295 node = VP_TO_TMPFS_NODE(vp);
296
297 switch (vp->v_type) {
298 case VDIR:
299 /* FALLTHROUGH */
300 case VLNK:
301 /* FALLTHROUGH */
302 case VREG:
303 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
304 error = EROFS;
305 goto out;
306 }
307 break;
308
309 case VBLK:
310 /* FALLTHROUGH */
311 case VCHR:
312 /* FALLTHROUGH */
313 case VSOCK:
314 /* FALLTHROUGH */
315 case VFIFO:
316 break;
317
318 default:
319 error = EINVAL;
320 goto out;
321 }
322
323 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
324 error = EPERM;
325 goto out;
326 }
327
328 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
329 node->tn_gid, accmode, cred, NULL);
330
331out:
332 MPASS(VOP_ISLOCKED(vp));
333
334 return error;
335}
336
337/* --------------------------------------------------------------------- */
338
339int
340tmpfs_getattr(struct vop_getattr_args *v)
341{
342 struct vnode *vp = v->a_vp;
343 struct vattr *vap = v->a_vap;
344
345 struct tmpfs_node *node;
346
347 node = VP_TO_TMPFS_NODE(vp);
348
349 tmpfs_update(vp);
350
351 vap->va_type = vp->v_type;
352 vap->va_mode = node->tn_mode;
353 vap->va_nlink = node->tn_links;
354 vap->va_uid = node->tn_uid;
355 vap->va_gid = node->tn_gid;
356 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
357 vap->va_fileid = node->tn_id;
358 vap->va_size = node->tn_size;
359 vap->va_blocksize = PAGE_SIZE;
360 vap->va_atime = node->tn_atime;
361 vap->va_mtime = node->tn_mtime;
362 vap->va_ctime = node->tn_ctime;
363 vap->va_birthtime = node->tn_birthtime;
364 vap->va_gen = node->tn_gen;
365 vap->va_flags = node->tn_flags;
366 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
367 node->tn_rdev : NODEV;
368 vap->va_bytes = round_page(node->tn_size);
369 vap->va_filerev = 0;
370
371 return 0;
372}
373
374/* --------------------------------------------------------------------- */
375
376/* XXX Should this operation be atomic? I think it should, but code in
377 * XXX other places (e.g., ufs) doesn't seem to be... */
378int
379tmpfs_setattr(struct vop_setattr_args *v)
380{
381 struct vnode *vp = v->a_vp;
382 struct vattr *vap = v->a_vap;
383 struct ucred *cred = v->a_cred;
384 struct thread *td = curthread;
385
386 int error;
387
388 MPASS(VOP_ISLOCKED(vp));
389
390 error = 0;
391
392 /* Abort if any unsettable attribute is given. */
393 if (vap->va_type != VNON ||
394 vap->va_nlink != VNOVAL ||
395 vap->va_fsid != VNOVAL ||
396 vap->va_fileid != VNOVAL ||
397 vap->va_blocksize != VNOVAL ||
398 vap->va_gen != VNOVAL ||
399 vap->va_rdev != VNOVAL ||
400 vap->va_bytes != VNOVAL)
401 error = EINVAL;
402
403 if (error == 0 && (vap->va_flags != VNOVAL))
404 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
405
406 if (error == 0 && (vap->va_size != VNOVAL))
407 error = tmpfs_chsize(vp, vap->va_size, cred, td);
408
409 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
410 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
411
412 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
413 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
414
415 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
416 vap->va_atime.tv_nsec != VNOVAL) ||
417 (vap->va_mtime.tv_sec != VNOVAL &&
418 vap->va_mtime.tv_nsec != VNOVAL) ||
419 (vap->va_birthtime.tv_sec != VNOVAL &&
420 vap->va_birthtime.tv_nsec != VNOVAL)))
421 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
422 &vap->va_birthtime, vap->va_vaflags, cred, td);
423
424 /* Update the node times. We give preference to the error codes
425 * generated by this function rather than the ones that may arise
426 * from tmpfs_update. */
427 tmpfs_update(vp);
428
429 MPASS(VOP_ISLOCKED(vp));
430
431 return error;
432}
433
434/* --------------------------------------------------------------------- */
435static int
436tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx,
437 vm_offset_t offset, size_t tlen, struct uio *uio)
438{
439 vm_page_t m;
440 int error;
441
442 VM_OBJECT_LOCK(tobj);
443 vm_object_pip_add(tobj, 1);
444 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED |
445 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
446 if (m->valid != VM_PAGE_BITS_ALL) {
447 if (vm_pager_has_page(tobj, idx, NULL, NULL)) {
448 error = vm_pager_get_pages(tobj, &m, 1, 0);
449 if (error != 0) {
450 printf("tmpfs get pages from pager error [read]\n");
451 goto out;
452 }
453 } else
454 vm_page_zero_invalid(m, TRUE);
455 }
456 VM_OBJECT_UNLOCK(tobj);
457 error = uiomove_fromphys(&m, offset, tlen, uio);
458 VM_OBJECT_LOCK(tobj);
459out:
460 vm_page_lock(m);
461 vm_page_unwire(m, TRUE);
462 vm_page_unlock(m);
463 vm_page_wakeup(m);
464 vm_object_pip_subtract(tobj, 1);
465 VM_OBJECT_UNLOCK(tobj);
466
467 return (error);
468}
469
470static __inline int
471tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx,
472 vm_offset_t offset, size_t tlen, void *buf)
473{
474 struct uio uio;
475 struct iovec iov;
476
477 uio.uio_iovcnt = 1;
478 uio.uio_iov = &iov;
479 iov.iov_base = buf;
480 iov.iov_len = tlen;
481
482 uio.uio_offset = 0;
483 uio.uio_resid = tlen;
484 uio.uio_rw = UIO_READ;
485 uio.uio_segflg = UIO_SYSSPACE;
486 uio.uio_td = curthread;
487
488 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio));
489}
490
491static int
492tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio)
493{
494 struct sf_buf *sf;
495 vm_pindex_t idx;
496 vm_page_t m;
497 vm_offset_t offset;
498 off_t addr;
499 size_t tlen;
500 char *ma;
501 int error;
502
503 addr = uio->uio_offset;
504 idx = OFF_TO_IDX(addr);
505 offset = addr & PAGE_MASK;
506 tlen = MIN(PAGE_SIZE - offset, len);
507
508 if ((vobj == NULL) ||
509 (vobj->resident_page_count == 0 && vobj->cache == NULL))
510 goto nocache;
511
512 VM_OBJECT_LOCK(vobj);
513lookupvpg:
514 if (((m = vm_page_lookup(vobj, idx)) != NULL) &&
515 vm_page_is_valid(m, offset, tlen)) {
516 if ((m->oflags & VPO_BUSY) != 0) {
517 /*
518 * Reference the page before unlocking and sleeping so
519 * that the page daemon is less likely to reclaim it.
520 */
521 vm_page_reference(m);
522 vm_page_sleep(m, "tmfsmr");
523 goto lookupvpg;
524 }
525 vm_page_busy(m);
526 VM_OBJECT_UNLOCK(vobj);
527 error = uiomove_fromphys(&m, offset, tlen, uio);
528 VM_OBJECT_LOCK(vobj);
529 vm_page_wakeup(m);
530 VM_OBJECT_UNLOCK(vobj);
531 return (error);
532 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) {
533 KASSERT(offset == 0,
534 ("unexpected offset in tmpfs_mappedread for sendfile"));
535 if ((m->oflags & VPO_BUSY) != 0) {
536 /*
537 * Reference the page before unlocking and sleeping so
538 * that the page daemon is less likely to reclaim it.
539 */
540 vm_page_reference(m);
541 vm_page_sleep(m, "tmfsmr");
542 goto lookupvpg;
543 }
544 vm_page_busy(m);
545 VM_OBJECT_UNLOCK(vobj);
546 sched_pin();
547 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
548 ma = (char *)sf_buf_kva(sf);
549 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma);
550 if (error == 0) {
551 if (tlen != PAGE_SIZE)
552 bzero(ma + tlen, PAGE_SIZE - tlen);
553 uio->uio_offset += tlen;
554 uio->uio_resid -= tlen;
555 }
556 sf_buf_free(sf);
557 sched_unpin();
558 VM_OBJECT_LOCK(vobj);
559 if (error == 0)
560 m->valid = VM_PAGE_BITS_ALL;
561 vm_page_wakeup(m);
562 VM_OBJECT_UNLOCK(vobj);
563 return (error);
564 }
565 VM_OBJECT_UNLOCK(vobj);
566nocache:
567 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio);
568
569 return (error);
570}
571
572static int
573tmpfs_read(struct vop_read_args *v)
574{
575 struct vnode *vp = v->a_vp;
576 struct uio *uio = v->a_uio;
577
578 struct tmpfs_node *node;
579 vm_object_t uobj;
580 size_t len;
581 int resid;
582
583 int error = 0;
584
585 node = VP_TO_TMPFS_NODE(vp);
586
587 if (vp->v_type != VREG) {
588 error = EISDIR;
589 goto out;
590 }
591
592 if (uio->uio_offset < 0) {
593 error = EINVAL;
594 goto out;
595 }
596
597 node->tn_status |= TMPFS_NODE_ACCESSED;
598
599 uobj = node->tn_reg.tn_aobj;
600 while ((resid = uio->uio_resid) > 0) {
601 error = 0;
602 if (node->tn_size <= uio->uio_offset)
603 break;
604 len = MIN(node->tn_size - uio->uio_offset, resid);
605 if (len == 0)
606 break;
607 error = tmpfs_mappedread(vp->v_object, uobj, len, uio);
608 if ((error != 0) || (resid == uio->uio_resid))
609 break;
610 }
611
612out:
613
614 return error;
615}
616
617/* --------------------------------------------------------------------- */
618
619static int
620tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio)
621{
622 vm_pindex_t idx;
623 vm_page_t vpg, tpg;
624 vm_offset_t offset;
625 off_t addr;
626 size_t tlen;
627 int error;
628
629 error = 0;
630
631 addr = uio->uio_offset;
632 idx = OFF_TO_IDX(addr);
633 offset = addr & PAGE_MASK;
634 tlen = MIN(PAGE_SIZE - offset, len);
635
636 if ((vobj == NULL) ||
637 (vobj->resident_page_count == 0 && vobj->cache == NULL)) {
638 vpg = NULL;
639 goto nocache;
640 }
641
642 VM_OBJECT_LOCK(vobj);
643lookupvpg:
644 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) &&
645 vm_page_is_valid(vpg, offset, tlen)) {
646 if ((vpg->oflags & VPO_BUSY) != 0) {
647 /*
648 * Reference the page before unlocking and sleeping so
649 * that the page daemon is less likely to reclaim it.
650 */
651 vm_page_reference(vpg);
652 vm_page_sleep(vpg, "tmfsmw");
653 goto lookupvpg;
654 }
655 vm_page_busy(vpg);
656 vm_page_undirty(vpg);
657 VM_OBJECT_UNLOCK(vobj);
658 error = uiomove_fromphys(&vpg, offset, tlen, uio);
659 } else {
660 if (__predict_false(vobj->cache != NULL))
661 vm_page_cache_free(vobj, idx, idx + 1);
662 VM_OBJECT_UNLOCK(vobj);
663 vpg = NULL;
664 }
665nocache:
666 VM_OBJECT_LOCK(tobj);
667 vm_object_pip_add(tobj, 1);
668 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED |
669 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
670 if (tpg->valid != VM_PAGE_BITS_ALL) {
671 if (vm_pager_has_page(tobj, idx, NULL, NULL)) {
672 error = vm_pager_get_pages(tobj, &tpg, 1, 0);
673 if (error != 0) {
674 printf("tmpfs get pages from pager error [write]\n");
675 goto out;
676 }
677 } else
678 vm_page_zero_invalid(tpg, TRUE);
679 }
680 VM_OBJECT_UNLOCK(tobj);
681 if (vpg == NULL)
682 error = uiomove_fromphys(&tpg, offset, tlen, uio);
683 else {
684 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid"));
685 pmap_copy_page(vpg, tpg);
686 }
687 VM_OBJECT_LOCK(tobj);
688out:
689 if (vobj != NULL)
690 VM_OBJECT_LOCK(vobj);
691 if (error == 0) {
692 KASSERT(tpg->valid == VM_PAGE_BITS_ALL,
693 ("parts of tpg invalid"));
694 vm_page_dirty(tpg);
695 }
696 vm_page_lock(tpg);
697 vm_page_unwire(tpg, TRUE);
698 vm_page_unlock(tpg);
699 vm_page_wakeup(tpg);
700 if (vpg != NULL)
701 vm_page_wakeup(vpg);
702 if (vobj != NULL)
703 VM_OBJECT_UNLOCK(vobj);
704 vm_object_pip_subtract(tobj, 1);
705 VM_OBJECT_UNLOCK(tobj);
706
707 return (error);
708}
709
710static int
711tmpfs_write(struct vop_write_args *v)
712{
713 struct vnode *vp = v->a_vp;
714 struct uio *uio = v->a_uio;
715 int ioflag = v->a_ioflag;
716
717 boolean_t extended;
718 int error = 0;
719 off_t oldsize;
720 struct tmpfs_node *node;
721 vm_object_t uobj;
722 size_t len;
723 int resid;
724
725 node = VP_TO_TMPFS_NODE(vp);
726 oldsize = node->tn_size;
727
728 if (uio->uio_offset < 0 || vp->v_type != VREG) {
729 error = EINVAL;
730 goto out;
731 }
732
733 if (uio->uio_resid == 0) {
734 error = 0;
735 goto out;
736 }
737
738 if (ioflag & IO_APPEND)
739 uio->uio_offset = node->tn_size;
740
741 if (uio->uio_offset + uio->uio_resid >
742 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
743 return (EFBIG);
744
745 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
746 return (EFBIG);
747
748 extended = uio->uio_offset + uio->uio_resid > node->tn_size;
749 if (extended) {
750 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid);
751 if (error != 0)
752 goto out;
753 }
754
755 uobj = node->tn_reg.tn_aobj;
756 while ((resid = uio->uio_resid) > 0) {
757 if (node->tn_size <= uio->uio_offset)
758 break;
759 len = MIN(node->tn_size - uio->uio_offset, resid);
760 if (len == 0)
761 break;
762 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio);
763 if ((error != 0) || (resid == uio->uio_resid))
764 break;
765 }
766
767 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
768 (extended ? TMPFS_NODE_CHANGED : 0);
769
770 if (node->tn_mode & (S_ISUID | S_ISGID)) {
771 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
772 node->tn_mode &= ~(S_ISUID | S_ISGID);
773 }
774
775 if (error != 0)
776 (void)tmpfs_reg_resize(vp, oldsize);
777
778out:
779 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
780 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
781
782 return error;
783}
784
785/* --------------------------------------------------------------------- */
786
787static int
788tmpfs_fsync(struct vop_fsync_args *v)
789{
790 struct vnode *vp = v->a_vp;
791
792 MPASS(VOP_ISLOCKED(vp));
793
794 tmpfs_update(vp);
795
796 return 0;
797}
798
799/* --------------------------------------------------------------------- */
800
801static int
802tmpfs_remove(struct vop_remove_args *v)
803{
804 struct vnode *dvp = v->a_dvp;
805 struct vnode *vp = v->a_vp;
806
807 int error;
808 struct tmpfs_dirent *de;
809 struct tmpfs_mount *tmp;
810 struct tmpfs_node *dnode;
811 struct tmpfs_node *node;
812
813 MPASS(VOP_ISLOCKED(dvp));
814 MPASS(VOP_ISLOCKED(vp));
815
816 if (vp->v_type == VDIR) {
817 error = EISDIR;
818 goto out;
819 }
820
821 dnode = VP_TO_TMPFS_DIR(dvp);
822 node = VP_TO_TMPFS_NODE(vp);
823 tmp = VFS_TO_TMPFS(vp->v_mount);
824 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
825 MPASS(de != NULL);
826
827 /* Files marked as immutable or append-only cannot be deleted. */
828 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
829 (dnode->tn_flags & APPEND)) {
830 error = EPERM;
831 goto out;
832 }
833
834 /* Remove the entry from the directory; as it is a file, we do not
835 * have to change the number of hard links of the directory. */
836 tmpfs_dir_detach(dvp, de);
837 if (v->a_cnp->cn_flags & DOWHITEOUT)
838 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
839
840 /* Free the directory entry we just deleted. Note that the node
841 * referred by it will not be removed until the vnode is really
842 * reclaimed. */
843 tmpfs_free_dirent(tmp, de, TRUE);
844
845 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
846 error = 0;
847
848out:
849
850 return error;
851}
852
853/* --------------------------------------------------------------------- */
854
855static int
856tmpfs_link(struct vop_link_args *v)
857{
858 struct vnode *dvp = v->a_tdvp;
859 struct vnode *vp = v->a_vp;
860 struct componentname *cnp = v->a_cnp;
861
862 int error;
863 struct tmpfs_dirent *de;
864 struct tmpfs_node *node;
865
866 MPASS(VOP_ISLOCKED(dvp));
867 MPASS(cnp->cn_flags & HASBUF);
868 MPASS(dvp != vp); /* XXX When can this be false? */
869
870 node = VP_TO_TMPFS_NODE(vp);
871
872 /* XXX: Why aren't the following two tests done by the caller? */
873
874 /* Hard links of directories are forbidden. */
875 if (vp->v_type == VDIR) {
876 error = EPERM;
877 goto out;
878 }
879
880 /* Cannot create cross-device links. */
881 if (dvp->v_mount != vp->v_mount) {
882 error = EXDEV;
883 goto out;
884 }
885
886 /* Ensure that we do not overflow the maximum number of links imposed
887 * by the system. */
888 MPASS(node->tn_links <= LINK_MAX);
889 if (node->tn_links == LINK_MAX) {
890 error = EMLINK;
891 goto out;
892 }
893
894 /* We cannot create links of files marked immutable or append-only. */
895 if (node->tn_flags & (IMMUTABLE | APPEND)) {
896 error = EPERM;
897 goto out;
898 }
899
900 /* Allocate a new directory entry to represent the node. */
901 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
902 cnp->cn_nameptr, cnp->cn_namelen, &de);
903 if (error != 0)
904 goto out;
905
906 /* Insert the new directory entry into the appropriate directory. */
907 if (cnp->cn_flags & ISWHITEOUT)
908 tmpfs_dir_whiteout_remove(dvp, cnp);
909 tmpfs_dir_attach(dvp, de);
910
911 /* vp link count has changed, so update node times. */
912 node->tn_status |= TMPFS_NODE_CHANGED;
913 tmpfs_update(vp);
914
915 error = 0;
916
917out:
918 return error;
919}
920
921/* --------------------------------------------------------------------- */
922
923static int
924tmpfs_rename(struct vop_rename_args *v)
925{
926 struct vnode *fdvp = v->a_fdvp;
927 struct vnode *fvp = v->a_fvp;
928 struct componentname *fcnp = v->a_fcnp;
929 struct vnode *tdvp = v->a_tdvp;
930 struct vnode *tvp = v->a_tvp;
931 struct componentname *tcnp = v->a_tcnp;
932
933 char *newname;
934 int error;
935 struct tmpfs_dirent *de;
936 struct tmpfs_mount *tmp;
937 struct tmpfs_node *fdnode;
938 struct tmpfs_node *fnode;
939 struct tmpfs_node *tnode;
940 struct tmpfs_node *tdnode;
941
942 MPASS(VOP_ISLOCKED(tdvp));
943 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
944 MPASS(fcnp->cn_flags & HASBUF);
945 MPASS(tcnp->cn_flags & HASBUF);
946
947 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
948
949 /* Disallow cross-device renames.
950 * XXX Why isn't this done by the caller? */
951 if (fvp->v_mount != tdvp->v_mount ||
952 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
953 error = EXDEV;
954 goto out;
955 }
956
957 tmp = VFS_TO_TMPFS(tdvp->v_mount);
958 tdnode = VP_TO_TMPFS_DIR(tdvp);
959
960 /* If source and target are the same file, there is nothing to do. */
961 if (fvp == tvp) {
962 error = 0;
963 goto out;
964 }
965
966 /* If we need to move the directory between entries, lock the
967 * source so that we can safely operate on it. */
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/unistd.h>
50#include <sys/vnode.h>
51
52#include <vm/vm.h>
53#include <vm/vm_object.h>
54#include <vm/vm_page.h>
55#include <vm/vm_pager.h>
56
57#include <machine/_inttypes.h>
58
59#include <fs/fifofs/fifo.h>
60#include <fs/tmpfs/tmpfs_vnops.h>
61#include <fs/tmpfs/tmpfs.h>
62
63/* --------------------------------------------------------------------- */
64
65static int
66tmpfs_lookup(struct vop_cachedlookup_args *v)
67{
68 struct vnode *dvp = v->a_dvp;
69 struct vnode **vpp = v->a_vpp;
70 struct componentname *cnp = v->a_cnp;
71
72 int error;
73 struct tmpfs_dirent *de;
74 struct tmpfs_node *dnode;
75
76 dnode = VP_TO_TMPFS_DIR(dvp);
77 *vpp = NULLVP;
78
79 /* Check accessibility of requested node as a first step. */
80 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
81 if (error != 0)
82 goto out;
83
84 /* We cannot be requesting the parent directory of the root node. */
85 MPASS(IMPLIES(dnode->tn_type == VDIR &&
86 dnode->tn_dir.tn_parent == dnode,
87 !(cnp->cn_flags & ISDOTDOT)));
88
89 TMPFS_ASSERT_LOCKED(dnode);
90 if (dnode->tn_dir.tn_parent == NULL) {
91 error = ENOENT;
92 goto out;
93 }
94 if (cnp->cn_flags & ISDOTDOT) {
95 int ltype = 0;
96
97 ltype = VOP_ISLOCKED(dvp);
98 vhold(dvp);
99 VOP_UNLOCK(dvp, 0);
100 /* Allocate a new vnode on the matching entry. */
101 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
102 cnp->cn_lkflags, vpp);
103
104 vn_lock(dvp, ltype | LK_RETRY);
105 vdrop(dvp);
106 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
107 VREF(dvp);
108 *vpp = dvp;
109 error = 0;
110 } else {
111 de = tmpfs_dir_lookup(dnode, NULL, cnp);
112 if (de != NULL && de->td_node == NULL)
113 cnp->cn_flags |= ISWHITEOUT;
114 if (de == NULL || de->td_node == NULL) {
115 /* The entry was not found in the directory.
116 * This is OK if we are creating or renaming an
117 * entry and are working on the last component of
118 * the path name. */
119 if ((cnp->cn_flags & ISLASTCN) &&
120 (cnp->cn_nameiop == CREATE || \
121 cnp->cn_nameiop == RENAME ||
122 (cnp->cn_nameiop == DELETE &&
123 cnp->cn_flags & DOWHITEOUT &&
124 cnp->cn_flags & ISWHITEOUT))) {
125 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
126 cnp->cn_thread);
127 if (error != 0)
128 goto out;
129
130 /* Keep the component name in the buffer for
131 * future uses. */
132 cnp->cn_flags |= SAVENAME;
133
134 error = EJUSTRETURN;
135 } else
136 error = ENOENT;
137 } else {
138 struct tmpfs_node *tnode;
139
140 /* The entry was found, so get its associated
141 * tmpfs_node. */
142 tnode = de->td_node;
143
144 /* If we are not at the last path component and
145 * found a non-directory or non-link entry (which
146 * may itself be pointing to a directory), raise
147 * an error. */
148 if ((tnode->tn_type != VDIR &&
149 tnode->tn_type != VLNK) &&
150 !(cnp->cn_flags & ISLASTCN)) {
151 error = ENOTDIR;
152 goto out;
153 }
154
155 /* If we are deleting or renaming the entry, keep
156 * track of its tmpfs_dirent so that it can be
157 * easily deleted later. */
158 if ((cnp->cn_flags & ISLASTCN) &&
159 (cnp->cn_nameiop == DELETE ||
160 cnp->cn_nameiop == RENAME)) {
161 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
162 cnp->cn_thread);
163 if (error != 0)
164 goto out;
165
166 /* Allocate a new vnode on the matching entry. */
167 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
168 cnp->cn_lkflags, vpp);
169 if (error != 0)
170 goto out;
171
172 if ((dnode->tn_mode & S_ISTXT) &&
173 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
174 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
175 error = EPERM;
176 vput(*vpp);
177 *vpp = NULL;
178 goto out;
179 }
180 cnp->cn_flags |= SAVENAME;
181 } else {
182 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
183 cnp->cn_lkflags, vpp);
184 }
185 }
186 }
187
188 /* Store the result of this lookup in the cache. Avoid this if the
189 * request was for creation, as it does not improve timings on
190 * emprical tests. */
191 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE)
192 cache_enter(dvp, *vpp, cnp);
193
194out:
195 /* If there were no errors, *vpp cannot be null and it must be
196 * locked. */
197 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
198
199 return error;
200}
201
202/* --------------------------------------------------------------------- */
203
204static int
205tmpfs_create(struct vop_create_args *v)
206{
207 struct vnode *dvp = v->a_dvp;
208 struct vnode **vpp = v->a_vpp;
209 struct componentname *cnp = v->a_cnp;
210 struct vattr *vap = v->a_vap;
211
212 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
213
214 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
215}
216/* --------------------------------------------------------------------- */
217
218static int
219tmpfs_mknod(struct vop_mknod_args *v)
220{
221 struct vnode *dvp = v->a_dvp;
222 struct vnode **vpp = v->a_vpp;
223 struct componentname *cnp = v->a_cnp;
224 struct vattr *vap = v->a_vap;
225
226 if (vap->va_type != VBLK && vap->va_type != VCHR &&
227 vap->va_type != VFIFO)
228 return EINVAL;
229
230 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
231}
232
233/* --------------------------------------------------------------------- */
234
235static int
236tmpfs_open(struct vop_open_args *v)
237{
238 struct vnode *vp = v->a_vp;
239 int mode = v->a_mode;
240
241 int error;
242 struct tmpfs_node *node;
243
244 MPASS(VOP_ISLOCKED(vp));
245
246 node = VP_TO_TMPFS_NODE(vp);
247
248 /* The file is still active but all its names have been removed
249 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
250 * it is about to die. */
251 if (node->tn_links < 1)
252 return (ENOENT);
253
254 /* If the file is marked append-only, deny write requests. */
255 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
256 error = EPERM;
257 else {
258 error = 0;
259 vnode_create_vobject(vp, node->tn_size, v->a_td);
260 }
261
262 MPASS(VOP_ISLOCKED(vp));
263 return error;
264}
265
266/* --------------------------------------------------------------------- */
267
268static int
269tmpfs_close(struct vop_close_args *v)
270{
271 struct vnode *vp = v->a_vp;
272
273 MPASS(VOP_ISLOCKED(vp));
274
275 /* Update node times. */
276 tmpfs_update(vp);
277
278 return (0);
279}
280
281/* --------------------------------------------------------------------- */
282
283int
284tmpfs_access(struct vop_access_args *v)
285{
286 struct vnode *vp = v->a_vp;
287 accmode_t accmode = v->a_accmode;
288 struct ucred *cred = v->a_cred;
289
290 int error;
291 struct tmpfs_node *node;
292
293 MPASS(VOP_ISLOCKED(vp));
294
295 node = VP_TO_TMPFS_NODE(vp);
296
297 switch (vp->v_type) {
298 case VDIR:
299 /* FALLTHROUGH */
300 case VLNK:
301 /* FALLTHROUGH */
302 case VREG:
303 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
304 error = EROFS;
305 goto out;
306 }
307 break;
308
309 case VBLK:
310 /* FALLTHROUGH */
311 case VCHR:
312 /* FALLTHROUGH */
313 case VSOCK:
314 /* FALLTHROUGH */
315 case VFIFO:
316 break;
317
318 default:
319 error = EINVAL;
320 goto out;
321 }
322
323 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
324 error = EPERM;
325 goto out;
326 }
327
328 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
329 node->tn_gid, accmode, cred, NULL);
330
331out:
332 MPASS(VOP_ISLOCKED(vp));
333
334 return error;
335}
336
337/* --------------------------------------------------------------------- */
338
339int
340tmpfs_getattr(struct vop_getattr_args *v)
341{
342 struct vnode *vp = v->a_vp;
343 struct vattr *vap = v->a_vap;
344
345 struct tmpfs_node *node;
346
347 node = VP_TO_TMPFS_NODE(vp);
348
349 tmpfs_update(vp);
350
351 vap->va_type = vp->v_type;
352 vap->va_mode = node->tn_mode;
353 vap->va_nlink = node->tn_links;
354 vap->va_uid = node->tn_uid;
355 vap->va_gid = node->tn_gid;
356 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
357 vap->va_fileid = node->tn_id;
358 vap->va_size = node->tn_size;
359 vap->va_blocksize = PAGE_SIZE;
360 vap->va_atime = node->tn_atime;
361 vap->va_mtime = node->tn_mtime;
362 vap->va_ctime = node->tn_ctime;
363 vap->va_birthtime = node->tn_birthtime;
364 vap->va_gen = node->tn_gen;
365 vap->va_flags = node->tn_flags;
366 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
367 node->tn_rdev : NODEV;
368 vap->va_bytes = round_page(node->tn_size);
369 vap->va_filerev = 0;
370
371 return 0;
372}
373
374/* --------------------------------------------------------------------- */
375
376/* XXX Should this operation be atomic? I think it should, but code in
377 * XXX other places (e.g., ufs) doesn't seem to be... */
378int
379tmpfs_setattr(struct vop_setattr_args *v)
380{
381 struct vnode *vp = v->a_vp;
382 struct vattr *vap = v->a_vap;
383 struct ucred *cred = v->a_cred;
384 struct thread *td = curthread;
385
386 int error;
387
388 MPASS(VOP_ISLOCKED(vp));
389
390 error = 0;
391
392 /* Abort if any unsettable attribute is given. */
393 if (vap->va_type != VNON ||
394 vap->va_nlink != VNOVAL ||
395 vap->va_fsid != VNOVAL ||
396 vap->va_fileid != VNOVAL ||
397 vap->va_blocksize != VNOVAL ||
398 vap->va_gen != VNOVAL ||
399 vap->va_rdev != VNOVAL ||
400 vap->va_bytes != VNOVAL)
401 error = EINVAL;
402
403 if (error == 0 && (vap->va_flags != VNOVAL))
404 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
405
406 if (error == 0 && (vap->va_size != VNOVAL))
407 error = tmpfs_chsize(vp, vap->va_size, cred, td);
408
409 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
410 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
411
412 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
413 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
414
415 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
416 vap->va_atime.tv_nsec != VNOVAL) ||
417 (vap->va_mtime.tv_sec != VNOVAL &&
418 vap->va_mtime.tv_nsec != VNOVAL) ||
419 (vap->va_birthtime.tv_sec != VNOVAL &&
420 vap->va_birthtime.tv_nsec != VNOVAL)))
421 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
422 &vap->va_birthtime, vap->va_vaflags, cred, td);
423
424 /* Update the node times. We give preference to the error codes
425 * generated by this function rather than the ones that may arise
426 * from tmpfs_update. */
427 tmpfs_update(vp);
428
429 MPASS(VOP_ISLOCKED(vp));
430
431 return error;
432}
433
434/* --------------------------------------------------------------------- */
435static int
436tmpfs_nocacheread(vm_object_t tobj, vm_pindex_t idx,
437 vm_offset_t offset, size_t tlen, struct uio *uio)
438{
439 vm_page_t m;
440 int error;
441
442 VM_OBJECT_LOCK(tobj);
443 vm_object_pip_add(tobj, 1);
444 m = vm_page_grab(tobj, idx, VM_ALLOC_WIRED |
445 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
446 if (m->valid != VM_PAGE_BITS_ALL) {
447 if (vm_pager_has_page(tobj, idx, NULL, NULL)) {
448 error = vm_pager_get_pages(tobj, &m, 1, 0);
449 if (error != 0) {
450 printf("tmpfs get pages from pager error [read]\n");
451 goto out;
452 }
453 } else
454 vm_page_zero_invalid(m, TRUE);
455 }
456 VM_OBJECT_UNLOCK(tobj);
457 error = uiomove_fromphys(&m, offset, tlen, uio);
458 VM_OBJECT_LOCK(tobj);
459out:
460 vm_page_lock(m);
461 vm_page_unwire(m, TRUE);
462 vm_page_unlock(m);
463 vm_page_wakeup(m);
464 vm_object_pip_subtract(tobj, 1);
465 VM_OBJECT_UNLOCK(tobj);
466
467 return (error);
468}
469
470static __inline int
471tmpfs_nocacheread_buf(vm_object_t tobj, vm_pindex_t idx,
472 vm_offset_t offset, size_t tlen, void *buf)
473{
474 struct uio uio;
475 struct iovec iov;
476
477 uio.uio_iovcnt = 1;
478 uio.uio_iov = &iov;
479 iov.iov_base = buf;
480 iov.iov_len = tlen;
481
482 uio.uio_offset = 0;
483 uio.uio_resid = tlen;
484 uio.uio_rw = UIO_READ;
485 uio.uio_segflg = UIO_SYSSPACE;
486 uio.uio_td = curthread;
487
488 return (tmpfs_nocacheread(tobj, idx, offset, tlen, &uio));
489}
490
491static int
492tmpfs_mappedread(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio)
493{
494 struct sf_buf *sf;
495 vm_pindex_t idx;
496 vm_page_t m;
497 vm_offset_t offset;
498 off_t addr;
499 size_t tlen;
500 char *ma;
501 int error;
502
503 addr = uio->uio_offset;
504 idx = OFF_TO_IDX(addr);
505 offset = addr & PAGE_MASK;
506 tlen = MIN(PAGE_SIZE - offset, len);
507
508 if ((vobj == NULL) ||
509 (vobj->resident_page_count == 0 && vobj->cache == NULL))
510 goto nocache;
511
512 VM_OBJECT_LOCK(vobj);
513lookupvpg:
514 if (((m = vm_page_lookup(vobj, idx)) != NULL) &&
515 vm_page_is_valid(m, offset, tlen)) {
516 if ((m->oflags & VPO_BUSY) != 0) {
517 /*
518 * Reference the page before unlocking and sleeping so
519 * that the page daemon is less likely to reclaim it.
520 */
521 vm_page_reference(m);
522 vm_page_sleep(m, "tmfsmr");
523 goto lookupvpg;
524 }
525 vm_page_busy(m);
526 VM_OBJECT_UNLOCK(vobj);
527 error = uiomove_fromphys(&m, offset, tlen, uio);
528 VM_OBJECT_LOCK(vobj);
529 vm_page_wakeup(m);
530 VM_OBJECT_UNLOCK(vobj);
531 return (error);
532 } else if (m != NULL && uio->uio_segflg == UIO_NOCOPY) {
533 KASSERT(offset == 0,
534 ("unexpected offset in tmpfs_mappedread for sendfile"));
535 if ((m->oflags & VPO_BUSY) != 0) {
536 /*
537 * Reference the page before unlocking and sleeping so
538 * that the page daemon is less likely to reclaim it.
539 */
540 vm_page_reference(m);
541 vm_page_sleep(m, "tmfsmr");
542 goto lookupvpg;
543 }
544 vm_page_busy(m);
545 VM_OBJECT_UNLOCK(vobj);
546 sched_pin();
547 sf = sf_buf_alloc(m, SFB_CPUPRIVATE);
548 ma = (char *)sf_buf_kva(sf);
549 error = tmpfs_nocacheread_buf(tobj, idx, 0, tlen, ma);
550 if (error == 0) {
551 if (tlen != PAGE_SIZE)
552 bzero(ma + tlen, PAGE_SIZE - tlen);
553 uio->uio_offset += tlen;
554 uio->uio_resid -= tlen;
555 }
556 sf_buf_free(sf);
557 sched_unpin();
558 VM_OBJECT_LOCK(vobj);
559 if (error == 0)
560 m->valid = VM_PAGE_BITS_ALL;
561 vm_page_wakeup(m);
562 VM_OBJECT_UNLOCK(vobj);
563 return (error);
564 }
565 VM_OBJECT_UNLOCK(vobj);
566nocache:
567 error = tmpfs_nocacheread(tobj, idx, offset, tlen, uio);
568
569 return (error);
570}
571
572static int
573tmpfs_read(struct vop_read_args *v)
574{
575 struct vnode *vp = v->a_vp;
576 struct uio *uio = v->a_uio;
577
578 struct tmpfs_node *node;
579 vm_object_t uobj;
580 size_t len;
581 int resid;
582
583 int error = 0;
584
585 node = VP_TO_TMPFS_NODE(vp);
586
587 if (vp->v_type != VREG) {
588 error = EISDIR;
589 goto out;
590 }
591
592 if (uio->uio_offset < 0) {
593 error = EINVAL;
594 goto out;
595 }
596
597 node->tn_status |= TMPFS_NODE_ACCESSED;
598
599 uobj = node->tn_reg.tn_aobj;
600 while ((resid = uio->uio_resid) > 0) {
601 error = 0;
602 if (node->tn_size <= uio->uio_offset)
603 break;
604 len = MIN(node->tn_size - uio->uio_offset, resid);
605 if (len == 0)
606 break;
607 error = tmpfs_mappedread(vp->v_object, uobj, len, uio);
608 if ((error != 0) || (resid == uio->uio_resid))
609 break;
610 }
611
612out:
613
614 return error;
615}
616
617/* --------------------------------------------------------------------- */
618
619static int
620tmpfs_mappedwrite(vm_object_t vobj, vm_object_t tobj, size_t len, struct uio *uio)
621{
622 vm_pindex_t idx;
623 vm_page_t vpg, tpg;
624 vm_offset_t offset;
625 off_t addr;
626 size_t tlen;
627 int error;
628
629 error = 0;
630
631 addr = uio->uio_offset;
632 idx = OFF_TO_IDX(addr);
633 offset = addr & PAGE_MASK;
634 tlen = MIN(PAGE_SIZE - offset, len);
635
636 if ((vobj == NULL) ||
637 (vobj->resident_page_count == 0 && vobj->cache == NULL)) {
638 vpg = NULL;
639 goto nocache;
640 }
641
642 VM_OBJECT_LOCK(vobj);
643lookupvpg:
644 if (((vpg = vm_page_lookup(vobj, idx)) != NULL) &&
645 vm_page_is_valid(vpg, offset, tlen)) {
646 if ((vpg->oflags & VPO_BUSY) != 0) {
647 /*
648 * Reference the page before unlocking and sleeping so
649 * that the page daemon is less likely to reclaim it.
650 */
651 vm_page_reference(vpg);
652 vm_page_sleep(vpg, "tmfsmw");
653 goto lookupvpg;
654 }
655 vm_page_busy(vpg);
656 vm_page_undirty(vpg);
657 VM_OBJECT_UNLOCK(vobj);
658 error = uiomove_fromphys(&vpg, offset, tlen, uio);
659 } else {
660 if (__predict_false(vobj->cache != NULL))
661 vm_page_cache_free(vobj, idx, idx + 1);
662 VM_OBJECT_UNLOCK(vobj);
663 vpg = NULL;
664 }
665nocache:
666 VM_OBJECT_LOCK(tobj);
667 vm_object_pip_add(tobj, 1);
668 tpg = vm_page_grab(tobj, idx, VM_ALLOC_WIRED |
669 VM_ALLOC_ZERO | VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
670 if (tpg->valid != VM_PAGE_BITS_ALL) {
671 if (vm_pager_has_page(tobj, idx, NULL, NULL)) {
672 error = vm_pager_get_pages(tobj, &tpg, 1, 0);
673 if (error != 0) {
674 printf("tmpfs get pages from pager error [write]\n");
675 goto out;
676 }
677 } else
678 vm_page_zero_invalid(tpg, TRUE);
679 }
680 VM_OBJECT_UNLOCK(tobj);
681 if (vpg == NULL)
682 error = uiomove_fromphys(&tpg, offset, tlen, uio);
683 else {
684 KASSERT(vpg->valid == VM_PAGE_BITS_ALL, ("parts of vpg invalid"));
685 pmap_copy_page(vpg, tpg);
686 }
687 VM_OBJECT_LOCK(tobj);
688out:
689 if (vobj != NULL)
690 VM_OBJECT_LOCK(vobj);
691 if (error == 0) {
692 KASSERT(tpg->valid == VM_PAGE_BITS_ALL,
693 ("parts of tpg invalid"));
694 vm_page_dirty(tpg);
695 }
696 vm_page_lock(tpg);
697 vm_page_unwire(tpg, TRUE);
698 vm_page_unlock(tpg);
699 vm_page_wakeup(tpg);
700 if (vpg != NULL)
701 vm_page_wakeup(vpg);
702 if (vobj != NULL)
703 VM_OBJECT_UNLOCK(vobj);
704 vm_object_pip_subtract(tobj, 1);
705 VM_OBJECT_UNLOCK(tobj);
706
707 return (error);
708}
709
710static int
711tmpfs_write(struct vop_write_args *v)
712{
713 struct vnode *vp = v->a_vp;
714 struct uio *uio = v->a_uio;
715 int ioflag = v->a_ioflag;
716
717 boolean_t extended;
718 int error = 0;
719 off_t oldsize;
720 struct tmpfs_node *node;
721 vm_object_t uobj;
722 size_t len;
723 int resid;
724
725 node = VP_TO_TMPFS_NODE(vp);
726 oldsize = node->tn_size;
727
728 if (uio->uio_offset < 0 || vp->v_type != VREG) {
729 error = EINVAL;
730 goto out;
731 }
732
733 if (uio->uio_resid == 0) {
734 error = 0;
735 goto out;
736 }
737
738 if (ioflag & IO_APPEND)
739 uio->uio_offset = node->tn_size;
740
741 if (uio->uio_offset + uio->uio_resid >
742 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
743 return (EFBIG);
744
745 if (vn_rlimit_fsize(vp, uio, uio->uio_td))
746 return (EFBIG);
747
748 extended = uio->uio_offset + uio->uio_resid > node->tn_size;
749 if (extended) {
750 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid);
751 if (error != 0)
752 goto out;
753 }
754
755 uobj = node->tn_reg.tn_aobj;
756 while ((resid = uio->uio_resid) > 0) {
757 if (node->tn_size <= uio->uio_offset)
758 break;
759 len = MIN(node->tn_size - uio->uio_offset, resid);
760 if (len == 0)
761 break;
762 error = tmpfs_mappedwrite(vp->v_object, uobj, len, uio);
763 if ((error != 0) || (resid == uio->uio_resid))
764 break;
765 }
766
767 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
768 (extended ? TMPFS_NODE_CHANGED : 0);
769
770 if (node->tn_mode & (S_ISUID | S_ISGID)) {
771 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
772 node->tn_mode &= ~(S_ISUID | S_ISGID);
773 }
774
775 if (error != 0)
776 (void)tmpfs_reg_resize(vp, oldsize);
777
778out:
779 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
780 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
781
782 return error;
783}
784
785/* --------------------------------------------------------------------- */
786
787static int
788tmpfs_fsync(struct vop_fsync_args *v)
789{
790 struct vnode *vp = v->a_vp;
791
792 MPASS(VOP_ISLOCKED(vp));
793
794 tmpfs_update(vp);
795
796 return 0;
797}
798
799/* --------------------------------------------------------------------- */
800
801static int
802tmpfs_remove(struct vop_remove_args *v)
803{
804 struct vnode *dvp = v->a_dvp;
805 struct vnode *vp = v->a_vp;
806
807 int error;
808 struct tmpfs_dirent *de;
809 struct tmpfs_mount *tmp;
810 struct tmpfs_node *dnode;
811 struct tmpfs_node *node;
812
813 MPASS(VOP_ISLOCKED(dvp));
814 MPASS(VOP_ISLOCKED(vp));
815
816 if (vp->v_type == VDIR) {
817 error = EISDIR;
818 goto out;
819 }
820
821 dnode = VP_TO_TMPFS_DIR(dvp);
822 node = VP_TO_TMPFS_NODE(vp);
823 tmp = VFS_TO_TMPFS(vp->v_mount);
824 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
825 MPASS(de != NULL);
826
827 /* Files marked as immutable or append-only cannot be deleted. */
828 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
829 (dnode->tn_flags & APPEND)) {
830 error = EPERM;
831 goto out;
832 }
833
834 /* Remove the entry from the directory; as it is a file, we do not
835 * have to change the number of hard links of the directory. */
836 tmpfs_dir_detach(dvp, de);
837 if (v->a_cnp->cn_flags & DOWHITEOUT)
838 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
839
840 /* Free the directory entry we just deleted. Note that the node
841 * referred by it will not be removed until the vnode is really
842 * reclaimed. */
843 tmpfs_free_dirent(tmp, de, TRUE);
844
845 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
846 error = 0;
847
848out:
849
850 return error;
851}
852
853/* --------------------------------------------------------------------- */
854
855static int
856tmpfs_link(struct vop_link_args *v)
857{
858 struct vnode *dvp = v->a_tdvp;
859 struct vnode *vp = v->a_vp;
860 struct componentname *cnp = v->a_cnp;
861
862 int error;
863 struct tmpfs_dirent *de;
864 struct tmpfs_node *node;
865
866 MPASS(VOP_ISLOCKED(dvp));
867 MPASS(cnp->cn_flags & HASBUF);
868 MPASS(dvp != vp); /* XXX When can this be false? */
869
870 node = VP_TO_TMPFS_NODE(vp);
871
872 /* XXX: Why aren't the following two tests done by the caller? */
873
874 /* Hard links of directories are forbidden. */
875 if (vp->v_type == VDIR) {
876 error = EPERM;
877 goto out;
878 }
879
880 /* Cannot create cross-device links. */
881 if (dvp->v_mount != vp->v_mount) {
882 error = EXDEV;
883 goto out;
884 }
885
886 /* Ensure that we do not overflow the maximum number of links imposed
887 * by the system. */
888 MPASS(node->tn_links <= LINK_MAX);
889 if (node->tn_links == LINK_MAX) {
890 error = EMLINK;
891 goto out;
892 }
893
894 /* We cannot create links of files marked immutable or append-only. */
895 if (node->tn_flags & (IMMUTABLE | APPEND)) {
896 error = EPERM;
897 goto out;
898 }
899
900 /* Allocate a new directory entry to represent the node. */
901 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
902 cnp->cn_nameptr, cnp->cn_namelen, &de);
903 if (error != 0)
904 goto out;
905
906 /* Insert the new directory entry into the appropriate directory. */
907 if (cnp->cn_flags & ISWHITEOUT)
908 tmpfs_dir_whiteout_remove(dvp, cnp);
909 tmpfs_dir_attach(dvp, de);
910
911 /* vp link count has changed, so update node times. */
912 node->tn_status |= TMPFS_NODE_CHANGED;
913 tmpfs_update(vp);
914
915 error = 0;
916
917out:
918 return error;
919}
920
921/* --------------------------------------------------------------------- */
922
923static int
924tmpfs_rename(struct vop_rename_args *v)
925{
926 struct vnode *fdvp = v->a_fdvp;
927 struct vnode *fvp = v->a_fvp;
928 struct componentname *fcnp = v->a_fcnp;
929 struct vnode *tdvp = v->a_tdvp;
930 struct vnode *tvp = v->a_tvp;
931 struct componentname *tcnp = v->a_tcnp;
932
933 char *newname;
934 int error;
935 struct tmpfs_dirent *de;
936 struct tmpfs_mount *tmp;
937 struct tmpfs_node *fdnode;
938 struct tmpfs_node *fnode;
939 struct tmpfs_node *tnode;
940 struct tmpfs_node *tdnode;
941
942 MPASS(VOP_ISLOCKED(tdvp));
943 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
944 MPASS(fcnp->cn_flags & HASBUF);
945 MPASS(tcnp->cn_flags & HASBUF);
946
947 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
948
949 /* Disallow cross-device renames.
950 * XXX Why isn't this done by the caller? */
951 if (fvp->v_mount != tdvp->v_mount ||
952 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
953 error = EXDEV;
954 goto out;
955 }
956
957 tmp = VFS_TO_TMPFS(tdvp->v_mount);
958 tdnode = VP_TO_TMPFS_DIR(tdvp);
959
960 /* If source and target are the same file, there is nothing to do. */
961 if (fvp == tvp) {
962 error = 0;
963 goto out;
964 }
965
966 /* If we need to move the directory between entries, lock the
967 * source so that we can safely operate on it. */
968 if (tdvp != fdvp) {
969 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
970 if (error != 0)
971 goto out;
972 }
968 if (fdvp != tdvp && fdvp != tvp)
969 vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
973 fdnode = VP_TO_TMPFS_DIR(fdvp);
974 fnode = VP_TO_TMPFS_NODE(fvp);
975 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
976
977 /* Entry can disappear before we lock fdvp,
978 * also avoid manipulating '.' and '..' entries. */
979 if (de == NULL) {
980 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
981 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
982 error = EINVAL;
983 else
984 error = ENOENT;
985 goto out_locked;
986 }
987 MPASS(de->td_node == fnode);
988
989 /* If re-naming a directory to another preexisting directory
990 * ensure that the target directory is empty so that its
991 * removal causes no side effects.
992 * Kern_rename gurantees the destination to be a directory
993 * if the source is one. */
994 if (tvp != NULL) {
995 MPASS(tnode != NULL);
996
997 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
998 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
999 error = EPERM;
1000 goto out_locked;
1001 }
1002
1003 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
1004 if (tnode->tn_size > 0) {
1005 error = ENOTEMPTY;
1006 goto out_locked;
1007 }
1008 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1009 error = ENOTDIR;
1010 goto out_locked;
1011 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1012 error = EISDIR;
1013 goto out_locked;
1014 } else {
1015 MPASS(fnode->tn_type != VDIR &&
1016 tnode->tn_type != VDIR);
1017 }
1018 }
1019
1020 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
1021 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1022 error = EPERM;
1023 goto out_locked;
1024 }
1025
1026 /* Ensure that we have enough memory to hold the new name, if it
1027 * has to be changed. */
1028 if (fcnp->cn_namelen != tcnp->cn_namelen ||
1029 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
1030 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
1031 } else
1032 newname = NULL;
1033
1034 /* If the node is being moved to another directory, we have to do
1035 * the move. */
1036 if (fdnode != tdnode) {
1037 /* In case we are moving a directory, we have to adjust its
1038 * parent to point to the new parent. */
1039 if (de->td_node->tn_type == VDIR) {
1040 struct tmpfs_node *n;
1041
1042 /* Ensure the target directory is not a child of the
1043 * directory being moved. Otherwise, we'd end up
1044 * with stale nodes. */
1045 n = tdnode;
1046 /* TMPFS_LOCK garanties that no nodes are freed while
1047 * traversing the list. Nodes can only be marked as
1048 * removed: tn_parent == NULL. */
1049 TMPFS_LOCK(tmp);
1050 TMPFS_NODE_LOCK(n);
1051 while (n != n->tn_dir.tn_parent) {
1052 struct tmpfs_node *parent;
1053
1054 if (n == fnode) {
1055 TMPFS_NODE_UNLOCK(n);
1056 TMPFS_UNLOCK(tmp);
1057 error = EINVAL;
1058 if (newname != NULL)
1059 free(newname, M_TMPFSNAME);
1060 goto out_locked;
1061 }
1062 parent = n->tn_dir.tn_parent;
1063 TMPFS_NODE_UNLOCK(n);
1064 if (parent == NULL) {
1065 n = NULL;
1066 break;
1067 }
1068 TMPFS_NODE_LOCK(parent);
1069 if (parent->tn_dir.tn_parent == NULL) {
1070 TMPFS_NODE_UNLOCK(parent);
1071 n = NULL;
1072 break;
1073 }
1074 n = parent;
1075 }
1076 TMPFS_UNLOCK(tmp);
1077 if (n == NULL) {
1078 error = EINVAL;
1079 if (newname != NULL)
1080 free(newname, M_TMPFSNAME);
1081 goto out_locked;
1082 }
1083 TMPFS_NODE_UNLOCK(n);
1084
1085 /* Adjust the parent pointer. */
1086 TMPFS_VALIDATE_DIR(fnode);
1087 TMPFS_NODE_LOCK(de->td_node);
1088 de->td_node->tn_dir.tn_parent = tdnode;
1089 TMPFS_NODE_UNLOCK(de->td_node);
1090
1091 /* As a result of changing the target of the '..'
1092 * entry, the link count of the source and target
1093 * directories has to be adjusted. */
1094 TMPFS_NODE_LOCK(tdnode);
1095 TMPFS_ASSERT_LOCKED(tdnode);
1096 tdnode->tn_links++;
1097 TMPFS_NODE_UNLOCK(tdnode);
1098
1099 TMPFS_NODE_LOCK(fdnode);
1100 TMPFS_ASSERT_LOCKED(fdnode);
1101 fdnode->tn_links--;
1102 TMPFS_NODE_UNLOCK(fdnode);
1103 }
1104
1105 /* Do the move: just remove the entry from the source directory
1106 * and insert it into the target one. */
1107 tmpfs_dir_detach(fdvp, de);
1108 if (fcnp->cn_flags & DOWHITEOUT)
1109 tmpfs_dir_whiteout_add(fdvp, fcnp);
1110 if (tcnp->cn_flags & ISWHITEOUT)
1111 tmpfs_dir_whiteout_remove(tdvp, tcnp);
1112 tmpfs_dir_attach(tdvp, de);
1113 }
1114
1115 /* If the name has changed, we need to make it effective by changing
1116 * it in the directory entry. */
1117 if (newname != NULL) {
1118 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
1119
1120 free(de->td_name, M_TMPFSNAME);
1121 de->td_namelen = (uint16_t)tcnp->cn_namelen;
1122 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen);
1123 de->td_name = newname;
1124
1125 fnode->tn_status |= TMPFS_NODE_CHANGED;
1126 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
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, tcnp);
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, TRUE);
1140 }
1141 cache_purge(fvp);
1142
1143 error = 0;
1144
1145out_locked:
970 fdnode = VP_TO_TMPFS_DIR(fdvp);
971 fnode = VP_TO_TMPFS_NODE(fvp);
972 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
973
974 /* Entry can disappear before we lock fdvp,
975 * also avoid manipulating '.' and '..' entries. */
976 if (de == NULL) {
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 out_locked;
983 }
984 MPASS(de->td_node == fnode);
985
986 /* If re-naming a directory to another preexisting directory
987 * ensure that the target directory is empty so that its
988 * removal causes no side effects.
989 * Kern_rename gurantees the destination to be a directory
990 * if the source is one. */
991 if (tvp != NULL) {
992 MPASS(tnode != NULL);
993
994 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
995 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
996 error = EPERM;
997 goto out_locked;
998 }
999
1000 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
1001 if (tnode->tn_size > 0) {
1002 error = ENOTEMPTY;
1003 goto out_locked;
1004 }
1005 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1006 error = ENOTDIR;
1007 goto out_locked;
1008 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1009 error = EISDIR;
1010 goto out_locked;
1011 } else {
1012 MPASS(fnode->tn_type != VDIR &&
1013 tnode->tn_type != VDIR);
1014 }
1015 }
1016
1017 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
1018 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1019 error = EPERM;
1020 goto out_locked;
1021 }
1022
1023 /* Ensure that we have enough memory to hold the new name, if it
1024 * has to be changed. */
1025 if (fcnp->cn_namelen != tcnp->cn_namelen ||
1026 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
1027 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
1028 } else
1029 newname = NULL;
1030
1031 /* If the node is being moved to another directory, we have to do
1032 * the move. */
1033 if (fdnode != tdnode) {
1034 /* In case we are moving a directory, we have to adjust its
1035 * parent to point to the new parent. */
1036 if (de->td_node->tn_type == VDIR) {
1037 struct tmpfs_node *n;
1038
1039 /* Ensure the target directory is not a child of the
1040 * directory being moved. Otherwise, we'd end up
1041 * with stale nodes. */
1042 n = tdnode;
1043 /* TMPFS_LOCK garanties that no nodes are freed while
1044 * traversing the list. Nodes can only be marked as
1045 * removed: tn_parent == NULL. */
1046 TMPFS_LOCK(tmp);
1047 TMPFS_NODE_LOCK(n);
1048 while (n != n->tn_dir.tn_parent) {
1049 struct tmpfs_node *parent;
1050
1051 if (n == fnode) {
1052 TMPFS_NODE_UNLOCK(n);
1053 TMPFS_UNLOCK(tmp);
1054 error = EINVAL;
1055 if (newname != NULL)
1056 free(newname, M_TMPFSNAME);
1057 goto out_locked;
1058 }
1059 parent = n->tn_dir.tn_parent;
1060 TMPFS_NODE_UNLOCK(n);
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_UNLOCK(tmp);
1074 if (n == NULL) {
1075 error = EINVAL;
1076 if (newname != NULL)
1077 free(newname, M_TMPFSNAME);
1078 goto out_locked;
1079 }
1080 TMPFS_NODE_UNLOCK(n);
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 TMPFS_NODE_UNLOCK(de->td_node);
1087
1088 /* As a result of changing the target of the '..'
1089 * entry, the link count of the source and target
1090 * directories has to be adjusted. */
1091 TMPFS_NODE_LOCK(tdnode);
1092 TMPFS_ASSERT_LOCKED(tdnode);
1093 tdnode->tn_links++;
1094 TMPFS_NODE_UNLOCK(tdnode);
1095
1096 TMPFS_NODE_LOCK(fdnode);
1097 TMPFS_ASSERT_LOCKED(fdnode);
1098 fdnode->tn_links--;
1099 TMPFS_NODE_UNLOCK(fdnode);
1100 }
1101
1102 /* Do the move: just remove the entry from the source directory
1103 * and insert it into the target one. */
1104 tmpfs_dir_detach(fdvp, de);
1105 if (fcnp->cn_flags & DOWHITEOUT)
1106 tmpfs_dir_whiteout_add(fdvp, fcnp);
1107 if (tcnp->cn_flags & ISWHITEOUT)
1108 tmpfs_dir_whiteout_remove(tdvp, tcnp);
1109 tmpfs_dir_attach(tdvp, de);
1110 }
1111
1112 /* If the name has changed, we need to make it effective by changing
1113 * it in the directory entry. */
1114 if (newname != NULL) {
1115 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
1116
1117 free(de->td_name, M_TMPFSNAME);
1118 de->td_namelen = (uint16_t)tcnp->cn_namelen;
1119 memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen);
1120 de->td_name = newname;
1121
1122 fnode->tn_status |= TMPFS_NODE_CHANGED;
1123 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1124 }
1125
1126 /* If we are overwriting an entry, we have to remove the old one
1127 * from the target directory. */
1128 if (tvp != NULL) {
1129 /* Remove the old entry from the target directory. */
1130 de = tmpfs_dir_lookup(tdnode, tnode, tcnp);
1131 tmpfs_dir_detach(tdvp, de);
1132
1133 /* Free the directory entry we just deleted. Note that the
1134 * node referred by it will not be removed until the vnode is
1135 * really reclaimed. */
1136 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE);
1137 }
1138 cache_purge(fvp);
1139
1140 error = 0;
1141
1142out_locked:
1146 if (fdnode != tdnode)
1143 if (fdvp != tdvp && fdvp != tvp)
1147 VOP_UNLOCK(fdvp, 0);
1148
1149out:
1150 /* Release target nodes. */
1151 /* XXX: I don't understand when tdvp can be the same as tvp, but
1152 * other code takes care of this... */
1153 if (tdvp == tvp)
1154 vrele(tdvp);
1155 else
1156 vput(tdvp);
1157 if (tvp != NULL)
1158 vput(tvp);
1159
1160 /* Release source nodes. */
1161 vrele(fdvp);
1162 vrele(fvp);
1163
1164 return error;
1165}
1166
1167/* --------------------------------------------------------------------- */
1168
1169static int
1170tmpfs_mkdir(struct vop_mkdir_args *v)
1171{
1172 struct vnode *dvp = v->a_dvp;
1173 struct vnode **vpp = v->a_vpp;
1174 struct componentname *cnp = v->a_cnp;
1175 struct vattr *vap = v->a_vap;
1176
1177 MPASS(vap->va_type == VDIR);
1178
1179 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1180}
1181
1182/* --------------------------------------------------------------------- */
1183
1184static int
1185tmpfs_rmdir(struct vop_rmdir_args *v)
1186{
1187 struct vnode *dvp = v->a_dvp;
1188 struct vnode *vp = v->a_vp;
1189
1190 int error;
1191 struct tmpfs_dirent *de;
1192 struct tmpfs_mount *tmp;
1193 struct tmpfs_node *dnode;
1194 struct tmpfs_node *node;
1195
1196 MPASS(VOP_ISLOCKED(dvp));
1197 MPASS(VOP_ISLOCKED(vp));
1198
1199 tmp = VFS_TO_TMPFS(dvp->v_mount);
1200 dnode = VP_TO_TMPFS_DIR(dvp);
1201 node = VP_TO_TMPFS_DIR(vp);
1202
1203 /* Directories with more than two entries ('.' and '..') cannot be
1204 * removed. */
1205 if (node->tn_size > 0) {
1206 error = ENOTEMPTY;
1207 goto out;
1208 }
1209
1210 if ((dnode->tn_flags & APPEND)
1211 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1212 error = EPERM;
1213 goto out;
1214 }
1215
1216 /* This invariant holds only if we are not trying to remove "..".
1217 * We checked for that above so this is safe now. */
1218 MPASS(node->tn_dir.tn_parent == dnode);
1219
1220 /* Get the directory entry associated with node (vp). This was
1221 * filled by tmpfs_lookup while looking up the entry. */
1222 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1223 MPASS(TMPFS_DIRENT_MATCHES(de,
1224 v->a_cnp->cn_nameptr,
1225 v->a_cnp->cn_namelen));
1226
1227 /* Check flags to see if we are allowed to remove the directory. */
1228 if (dnode->tn_flags & APPEND
1229 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1230 error = EPERM;
1231 goto out;
1232 }
1233
1234
1235 /* Detach the directory entry from the directory (dnode). */
1236 tmpfs_dir_detach(dvp, de);
1237 if (v->a_cnp->cn_flags & DOWHITEOUT)
1238 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1239
1240 /* No vnode should be allocated for this entry from this point */
1241 TMPFS_NODE_LOCK(node);
1242 TMPFS_ASSERT_ELOCKED(node);
1243 node->tn_links--;
1244 node->tn_dir.tn_parent = NULL;
1245 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1246 TMPFS_NODE_MODIFIED;
1247
1248 TMPFS_NODE_UNLOCK(node);
1249
1250 TMPFS_NODE_LOCK(dnode);
1251 TMPFS_ASSERT_ELOCKED(dnode);
1252 dnode->tn_links--;
1253 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1254 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1255 TMPFS_NODE_UNLOCK(dnode);
1256
1257 cache_purge(dvp);
1258 cache_purge(vp);
1259
1260 /* Free the directory entry we just deleted. Note that the node
1261 * referred by it will not be removed until the vnode is really
1262 * reclaimed. */
1263 tmpfs_free_dirent(tmp, de, TRUE);
1264
1265 /* Release the deleted vnode (will destroy the node, notify
1266 * interested parties and clean it from the cache). */
1267
1268 dnode->tn_status |= TMPFS_NODE_CHANGED;
1269 tmpfs_update(dvp);
1270
1271 error = 0;
1272
1273out:
1274 return error;
1275}
1276
1277/* --------------------------------------------------------------------- */
1278
1279static int
1280tmpfs_symlink(struct vop_symlink_args *v)
1281{
1282 struct vnode *dvp = v->a_dvp;
1283 struct vnode **vpp = v->a_vpp;
1284 struct componentname *cnp = v->a_cnp;
1285 struct vattr *vap = v->a_vap;
1286 char *target = v->a_target;
1287
1288#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1289 MPASS(vap->va_type == VLNK);
1290#else
1291 vap->va_type = VLNK;
1292#endif
1293
1294 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1295}
1296
1297/* --------------------------------------------------------------------- */
1298
1299static int
1300tmpfs_readdir(struct vop_readdir_args *v)
1301{
1302 struct vnode *vp = v->a_vp;
1303 struct uio *uio = v->a_uio;
1304 int *eofflag = v->a_eofflag;
1305 u_long **cookies = v->a_cookies;
1306 int *ncookies = v->a_ncookies;
1307
1308 int error;
1309 off_t startoff;
1310 off_t cnt = 0;
1311 struct tmpfs_node *node;
1312
1313 /* This operation only makes sense on directory nodes. */
1314 if (vp->v_type != VDIR)
1315 return ENOTDIR;
1316
1317 node = VP_TO_TMPFS_DIR(vp);
1318
1319 startoff = uio->uio_offset;
1320
1321 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1322 error = tmpfs_dir_getdotdent(node, uio);
1323 if (error != 0)
1324 goto outok;
1325 cnt++;
1326 }
1327
1328 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1329 error = tmpfs_dir_getdotdotdent(node, uio);
1330 if (error != 0)
1331 goto outok;
1332 cnt++;
1333 }
1334
1335 error = tmpfs_dir_getdents(node, uio, &cnt);
1336
1337outok:
1338 MPASS(error >= -1);
1339
1340 if (error == -1)
1341 error = (cnt != 0) ? 0 : EINVAL;
1342
1343 if (eofflag != NULL)
1344 *eofflag =
1345 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1346
1347 /* Update NFS-related variables. */
1348 if (error == 0 && cookies != NULL && ncookies != NULL) {
1349 off_t i;
1350 off_t off = startoff;
1351 struct tmpfs_dirent *de = NULL;
1352
1353 *ncookies = cnt;
1354 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1355
1356 for (i = 0; i < cnt; i++) {
1357 MPASS(off != TMPFS_DIRCOOKIE_EOF);
1358 if (off == TMPFS_DIRCOOKIE_DOT) {
1359 off = TMPFS_DIRCOOKIE_DOTDOT;
1360 } else {
1361 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1362 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
1363 } else if (de != NULL) {
1364 de = TAILQ_NEXT(de, td_entries);
1365 } else {
1366 de = tmpfs_dir_lookupbycookie(node,
1367 off);
1368 MPASS(de != NULL);
1369 de = TAILQ_NEXT(de, td_entries);
1370 }
1371 if (de == NULL)
1372 off = TMPFS_DIRCOOKIE_EOF;
1373 else
1374 off = tmpfs_dircookie(de);
1375 }
1376
1377 (*cookies)[i] = off;
1378 }
1379 MPASS(uio->uio_offset == off);
1380 }
1381
1382 return error;
1383}
1384
1385/* --------------------------------------------------------------------- */
1386
1387static int
1388tmpfs_readlink(struct vop_readlink_args *v)
1389{
1390 struct vnode *vp = v->a_vp;
1391 struct uio *uio = v->a_uio;
1392
1393 int error;
1394 struct tmpfs_node *node;
1395
1396 MPASS(uio->uio_offset == 0);
1397 MPASS(vp->v_type == VLNK);
1398
1399 node = VP_TO_TMPFS_NODE(vp);
1400
1401 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1402 uio);
1403 node->tn_status |= TMPFS_NODE_ACCESSED;
1404
1405 return error;
1406}
1407
1408/* --------------------------------------------------------------------- */
1409
1410static int
1411tmpfs_inactive(struct vop_inactive_args *v)
1412{
1413 struct vnode *vp = v->a_vp;
1414 struct thread *l = v->a_td;
1415
1416 struct tmpfs_node *node;
1417
1418 MPASS(VOP_ISLOCKED(vp));
1419
1420 node = VP_TO_TMPFS_NODE(vp);
1421
1422 if (node->tn_links == 0)
1423 vrecycle(vp, l);
1424
1425 return 0;
1426}
1427
1428/* --------------------------------------------------------------------- */
1429
1430int
1431tmpfs_reclaim(struct vop_reclaim_args *v)
1432{
1433 struct vnode *vp = v->a_vp;
1434
1435 struct tmpfs_mount *tmp;
1436 struct tmpfs_node *node;
1437
1438 node = VP_TO_TMPFS_NODE(vp);
1439 tmp = VFS_TO_TMPFS(vp->v_mount);
1440
1441 vnode_destroy_vobject(vp);
1442 cache_purge(vp);
1443
1444 TMPFS_NODE_LOCK(node);
1445 TMPFS_ASSERT_ELOCKED(node);
1446 tmpfs_free_vp(vp);
1447
1448 /* If the node referenced by this vnode was deleted by the user,
1449 * we must free its associated data structures (now that the vnode
1450 * is being reclaimed). */
1451 if (node->tn_links == 0 &&
1452 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1453 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1454 TMPFS_NODE_UNLOCK(node);
1455 tmpfs_free_node(tmp, node);
1456 } else
1457 TMPFS_NODE_UNLOCK(node);
1458
1459 MPASS(vp->v_data == NULL);
1460 return 0;
1461}
1462
1463/* --------------------------------------------------------------------- */
1464
1465static int
1466tmpfs_print(struct vop_print_args *v)
1467{
1468 struct vnode *vp = v->a_vp;
1469
1470 struct tmpfs_node *node;
1471
1472 node = VP_TO_TMPFS_NODE(vp);
1473
1474 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1475 node, node->tn_flags, node->tn_links);
1476 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX
1477 ", status 0x%x\n",
1478 node->tn_mode, node->tn_uid, node->tn_gid,
1479 (uintmax_t)node->tn_size, node->tn_status);
1480
1481 if (vp->v_type == VFIFO)
1482 fifo_printinfo(vp);
1483
1484 printf("\n");
1485
1486 return 0;
1487}
1488
1489/* --------------------------------------------------------------------- */
1490
1491static int
1492tmpfs_pathconf(struct vop_pathconf_args *v)
1493{
1494 int name = v->a_name;
1495 register_t *retval = v->a_retval;
1496
1497 int error;
1498
1499 error = 0;
1500
1501 switch (name) {
1502 case _PC_LINK_MAX:
1503 *retval = LINK_MAX;
1504 break;
1505
1506 case _PC_NAME_MAX:
1507 *retval = NAME_MAX;
1508 break;
1509
1510 case _PC_PATH_MAX:
1511 *retval = PATH_MAX;
1512 break;
1513
1514 case _PC_PIPE_BUF:
1515 *retval = PIPE_BUF;
1516 break;
1517
1518 case _PC_CHOWN_RESTRICTED:
1519 *retval = 1;
1520 break;
1521
1522 case _PC_NO_TRUNC:
1523 *retval = 1;
1524 break;
1525
1526 case _PC_SYNC_IO:
1527 *retval = 1;
1528 break;
1529
1530 case _PC_FILESIZEBITS:
1531 *retval = 0; /* XXX Don't know which value should I return. */
1532 break;
1533
1534 default:
1535 error = EINVAL;
1536 }
1537
1538 return error;
1539}
1540
1541static int
1542tmpfs_vptofh(struct vop_vptofh_args *ap)
1543{
1544 struct tmpfs_fid *tfhp;
1545 struct tmpfs_node *node;
1546
1547 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1548 node = VP_TO_TMPFS_NODE(ap->a_vp);
1549
1550 tfhp->tf_len = sizeof(struct tmpfs_fid);
1551 tfhp->tf_id = node->tn_id;
1552 tfhp->tf_gen = node->tn_gen;
1553
1554 return (0);
1555}
1556
1557static int
1558tmpfs_whiteout(struct vop_whiteout_args *ap)
1559{
1560 struct vnode *dvp = ap->a_dvp;
1561 struct componentname *cnp = ap->a_cnp;
1562 struct tmpfs_dirent *de;
1563
1564 switch (ap->a_flags) {
1565 case LOOKUP:
1566 return (0);
1567 case CREATE:
1568 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1569 if (de != NULL)
1570 return (de->td_node == NULL ? 0 : EEXIST);
1571 return (tmpfs_dir_whiteout_add(dvp, cnp));
1572 case DELETE:
1573 tmpfs_dir_whiteout_remove(dvp, cnp);
1574 return (0);
1575 default:
1576 panic("tmpfs_whiteout: unknown op");
1577 }
1578}
1579
1580/* --------------------------------------------------------------------- */
1581
1582/*
1583 * vnode operations vector used for files stored in a tmpfs file system.
1584 */
1585struct vop_vector tmpfs_vnodeop_entries = {
1586 .vop_default = &default_vnodeops,
1587 .vop_lookup = vfs_cache_lookup,
1588 .vop_cachedlookup = tmpfs_lookup,
1589 .vop_create = tmpfs_create,
1590 .vop_mknod = tmpfs_mknod,
1591 .vop_open = tmpfs_open,
1592 .vop_close = tmpfs_close,
1593 .vop_access = tmpfs_access,
1594 .vop_getattr = tmpfs_getattr,
1595 .vop_setattr = tmpfs_setattr,
1596 .vop_read = tmpfs_read,
1597 .vop_write = tmpfs_write,
1598 .vop_fsync = tmpfs_fsync,
1599 .vop_remove = tmpfs_remove,
1600 .vop_link = tmpfs_link,
1601 .vop_rename = tmpfs_rename,
1602 .vop_mkdir = tmpfs_mkdir,
1603 .vop_rmdir = tmpfs_rmdir,
1604 .vop_symlink = tmpfs_symlink,
1605 .vop_readdir = tmpfs_readdir,
1606 .vop_readlink = tmpfs_readlink,
1607 .vop_inactive = tmpfs_inactive,
1608 .vop_reclaim = tmpfs_reclaim,
1609 .vop_print = tmpfs_print,
1610 .vop_pathconf = tmpfs_pathconf,
1611 .vop_vptofh = tmpfs_vptofh,
1612 .vop_whiteout = tmpfs_whiteout,
1613 .vop_bmap = VOP_EOPNOTSUPP,
1614};
1615
1144 VOP_UNLOCK(fdvp, 0);
1145
1146out:
1147 /* Release target nodes. */
1148 /* XXX: I don't understand when tdvp can be the same as tvp, but
1149 * other code takes care of this... */
1150 if (tdvp == tvp)
1151 vrele(tdvp);
1152 else
1153 vput(tdvp);
1154 if (tvp != NULL)
1155 vput(tvp);
1156
1157 /* Release source nodes. */
1158 vrele(fdvp);
1159 vrele(fvp);
1160
1161 return error;
1162}
1163
1164/* --------------------------------------------------------------------- */
1165
1166static int
1167tmpfs_mkdir(struct vop_mkdir_args *v)
1168{
1169 struct vnode *dvp = v->a_dvp;
1170 struct vnode **vpp = v->a_vpp;
1171 struct componentname *cnp = v->a_cnp;
1172 struct vattr *vap = v->a_vap;
1173
1174 MPASS(vap->va_type == VDIR);
1175
1176 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
1177}
1178
1179/* --------------------------------------------------------------------- */
1180
1181static int
1182tmpfs_rmdir(struct vop_rmdir_args *v)
1183{
1184 struct vnode *dvp = v->a_dvp;
1185 struct vnode *vp = v->a_vp;
1186
1187 int error;
1188 struct tmpfs_dirent *de;
1189 struct tmpfs_mount *tmp;
1190 struct tmpfs_node *dnode;
1191 struct tmpfs_node *node;
1192
1193 MPASS(VOP_ISLOCKED(dvp));
1194 MPASS(VOP_ISLOCKED(vp));
1195
1196 tmp = VFS_TO_TMPFS(dvp->v_mount);
1197 dnode = VP_TO_TMPFS_DIR(dvp);
1198 node = VP_TO_TMPFS_DIR(vp);
1199
1200 /* Directories with more than two entries ('.' and '..') cannot be
1201 * removed. */
1202 if (node->tn_size > 0) {
1203 error = ENOTEMPTY;
1204 goto out;
1205 }
1206
1207 if ((dnode->tn_flags & APPEND)
1208 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1209 error = EPERM;
1210 goto out;
1211 }
1212
1213 /* This invariant holds only if we are not trying to remove "..".
1214 * We checked for that above so this is safe now. */
1215 MPASS(node->tn_dir.tn_parent == dnode);
1216
1217 /* Get the directory entry associated with node (vp). This was
1218 * filled by tmpfs_lookup while looking up the entry. */
1219 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
1220 MPASS(TMPFS_DIRENT_MATCHES(de,
1221 v->a_cnp->cn_nameptr,
1222 v->a_cnp->cn_namelen));
1223
1224 /* Check flags to see if we are allowed to remove the directory. */
1225 if (dnode->tn_flags & APPEND
1226 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1227 error = EPERM;
1228 goto out;
1229 }
1230
1231
1232 /* Detach the directory entry from the directory (dnode). */
1233 tmpfs_dir_detach(dvp, de);
1234 if (v->a_cnp->cn_flags & DOWHITEOUT)
1235 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
1236
1237 /* No vnode should be allocated for this entry from this point */
1238 TMPFS_NODE_LOCK(node);
1239 TMPFS_ASSERT_ELOCKED(node);
1240 node->tn_links--;
1241 node->tn_dir.tn_parent = NULL;
1242 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1243 TMPFS_NODE_MODIFIED;
1244
1245 TMPFS_NODE_UNLOCK(node);
1246
1247 TMPFS_NODE_LOCK(dnode);
1248 TMPFS_ASSERT_ELOCKED(dnode);
1249 dnode->tn_links--;
1250 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1251 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1252 TMPFS_NODE_UNLOCK(dnode);
1253
1254 cache_purge(dvp);
1255 cache_purge(vp);
1256
1257 /* Free the directory entry we just deleted. Note that the node
1258 * referred by it will not be removed until the vnode is really
1259 * reclaimed. */
1260 tmpfs_free_dirent(tmp, de, TRUE);
1261
1262 /* Release the deleted vnode (will destroy the node, notify
1263 * interested parties and clean it from the cache). */
1264
1265 dnode->tn_status |= TMPFS_NODE_CHANGED;
1266 tmpfs_update(dvp);
1267
1268 error = 0;
1269
1270out:
1271 return error;
1272}
1273
1274/* --------------------------------------------------------------------- */
1275
1276static int
1277tmpfs_symlink(struct vop_symlink_args *v)
1278{
1279 struct vnode *dvp = v->a_dvp;
1280 struct vnode **vpp = v->a_vpp;
1281 struct componentname *cnp = v->a_cnp;
1282 struct vattr *vap = v->a_vap;
1283 char *target = v->a_target;
1284
1285#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1286 MPASS(vap->va_type == VLNK);
1287#else
1288 vap->va_type = VLNK;
1289#endif
1290
1291 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
1292}
1293
1294/* --------------------------------------------------------------------- */
1295
1296static int
1297tmpfs_readdir(struct vop_readdir_args *v)
1298{
1299 struct vnode *vp = v->a_vp;
1300 struct uio *uio = v->a_uio;
1301 int *eofflag = v->a_eofflag;
1302 u_long **cookies = v->a_cookies;
1303 int *ncookies = v->a_ncookies;
1304
1305 int error;
1306 off_t startoff;
1307 off_t cnt = 0;
1308 struct tmpfs_node *node;
1309
1310 /* This operation only makes sense on directory nodes. */
1311 if (vp->v_type != VDIR)
1312 return ENOTDIR;
1313
1314 node = VP_TO_TMPFS_DIR(vp);
1315
1316 startoff = uio->uio_offset;
1317
1318 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1319 error = tmpfs_dir_getdotdent(node, uio);
1320 if (error != 0)
1321 goto outok;
1322 cnt++;
1323 }
1324
1325 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1326 error = tmpfs_dir_getdotdotdent(node, uio);
1327 if (error != 0)
1328 goto outok;
1329 cnt++;
1330 }
1331
1332 error = tmpfs_dir_getdents(node, uio, &cnt);
1333
1334outok:
1335 MPASS(error >= -1);
1336
1337 if (error == -1)
1338 error = (cnt != 0) ? 0 : EINVAL;
1339
1340 if (eofflag != NULL)
1341 *eofflag =
1342 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1343
1344 /* Update NFS-related variables. */
1345 if (error == 0 && cookies != NULL && ncookies != NULL) {
1346 off_t i;
1347 off_t off = startoff;
1348 struct tmpfs_dirent *de = NULL;
1349
1350 *ncookies = cnt;
1351 *cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1352
1353 for (i = 0; i < cnt; i++) {
1354 MPASS(off != TMPFS_DIRCOOKIE_EOF);
1355 if (off == TMPFS_DIRCOOKIE_DOT) {
1356 off = TMPFS_DIRCOOKIE_DOTDOT;
1357 } else {
1358 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1359 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
1360 } else if (de != NULL) {
1361 de = TAILQ_NEXT(de, td_entries);
1362 } else {
1363 de = tmpfs_dir_lookupbycookie(node,
1364 off);
1365 MPASS(de != NULL);
1366 de = TAILQ_NEXT(de, td_entries);
1367 }
1368 if (de == NULL)
1369 off = TMPFS_DIRCOOKIE_EOF;
1370 else
1371 off = tmpfs_dircookie(de);
1372 }
1373
1374 (*cookies)[i] = off;
1375 }
1376 MPASS(uio->uio_offset == off);
1377 }
1378
1379 return error;
1380}
1381
1382/* --------------------------------------------------------------------- */
1383
1384static int
1385tmpfs_readlink(struct vop_readlink_args *v)
1386{
1387 struct vnode *vp = v->a_vp;
1388 struct uio *uio = v->a_uio;
1389
1390 int error;
1391 struct tmpfs_node *node;
1392
1393 MPASS(uio->uio_offset == 0);
1394 MPASS(vp->v_type == VLNK);
1395
1396 node = VP_TO_TMPFS_NODE(vp);
1397
1398 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1399 uio);
1400 node->tn_status |= TMPFS_NODE_ACCESSED;
1401
1402 return error;
1403}
1404
1405/* --------------------------------------------------------------------- */
1406
1407static int
1408tmpfs_inactive(struct vop_inactive_args *v)
1409{
1410 struct vnode *vp = v->a_vp;
1411 struct thread *l = v->a_td;
1412
1413 struct tmpfs_node *node;
1414
1415 MPASS(VOP_ISLOCKED(vp));
1416
1417 node = VP_TO_TMPFS_NODE(vp);
1418
1419 if (node->tn_links == 0)
1420 vrecycle(vp, l);
1421
1422 return 0;
1423}
1424
1425/* --------------------------------------------------------------------- */
1426
1427int
1428tmpfs_reclaim(struct vop_reclaim_args *v)
1429{
1430 struct vnode *vp = v->a_vp;
1431
1432 struct tmpfs_mount *tmp;
1433 struct tmpfs_node *node;
1434
1435 node = VP_TO_TMPFS_NODE(vp);
1436 tmp = VFS_TO_TMPFS(vp->v_mount);
1437
1438 vnode_destroy_vobject(vp);
1439 cache_purge(vp);
1440
1441 TMPFS_NODE_LOCK(node);
1442 TMPFS_ASSERT_ELOCKED(node);
1443 tmpfs_free_vp(vp);
1444
1445 /* If the node referenced by this vnode was deleted by the user,
1446 * we must free its associated data structures (now that the vnode
1447 * is being reclaimed). */
1448 if (node->tn_links == 0 &&
1449 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1450 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1451 TMPFS_NODE_UNLOCK(node);
1452 tmpfs_free_node(tmp, node);
1453 } else
1454 TMPFS_NODE_UNLOCK(node);
1455
1456 MPASS(vp->v_data == NULL);
1457 return 0;
1458}
1459
1460/* --------------------------------------------------------------------- */
1461
1462static int
1463tmpfs_print(struct vop_print_args *v)
1464{
1465 struct vnode *vp = v->a_vp;
1466
1467 struct tmpfs_node *node;
1468
1469 node = VP_TO_TMPFS_NODE(vp);
1470
1471 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1472 node, node->tn_flags, node->tn_links);
1473 printf("\tmode 0%o, owner %d, group %d, size %" PRIdMAX
1474 ", status 0x%x\n",
1475 node->tn_mode, node->tn_uid, node->tn_gid,
1476 (uintmax_t)node->tn_size, node->tn_status);
1477
1478 if (vp->v_type == VFIFO)
1479 fifo_printinfo(vp);
1480
1481 printf("\n");
1482
1483 return 0;
1484}
1485
1486/* --------------------------------------------------------------------- */
1487
1488static int
1489tmpfs_pathconf(struct vop_pathconf_args *v)
1490{
1491 int name = v->a_name;
1492 register_t *retval = v->a_retval;
1493
1494 int error;
1495
1496 error = 0;
1497
1498 switch (name) {
1499 case _PC_LINK_MAX:
1500 *retval = LINK_MAX;
1501 break;
1502
1503 case _PC_NAME_MAX:
1504 *retval = NAME_MAX;
1505 break;
1506
1507 case _PC_PATH_MAX:
1508 *retval = PATH_MAX;
1509 break;
1510
1511 case _PC_PIPE_BUF:
1512 *retval = PIPE_BUF;
1513 break;
1514
1515 case _PC_CHOWN_RESTRICTED:
1516 *retval = 1;
1517 break;
1518
1519 case _PC_NO_TRUNC:
1520 *retval = 1;
1521 break;
1522
1523 case _PC_SYNC_IO:
1524 *retval = 1;
1525 break;
1526
1527 case _PC_FILESIZEBITS:
1528 *retval = 0; /* XXX Don't know which value should I return. */
1529 break;
1530
1531 default:
1532 error = EINVAL;
1533 }
1534
1535 return error;
1536}
1537
1538static int
1539tmpfs_vptofh(struct vop_vptofh_args *ap)
1540{
1541 struct tmpfs_fid *tfhp;
1542 struct tmpfs_node *node;
1543
1544 tfhp = (struct tmpfs_fid *)ap->a_fhp;
1545 node = VP_TO_TMPFS_NODE(ap->a_vp);
1546
1547 tfhp->tf_len = sizeof(struct tmpfs_fid);
1548 tfhp->tf_id = node->tn_id;
1549 tfhp->tf_gen = node->tn_gen;
1550
1551 return (0);
1552}
1553
1554static int
1555tmpfs_whiteout(struct vop_whiteout_args *ap)
1556{
1557 struct vnode *dvp = ap->a_dvp;
1558 struct componentname *cnp = ap->a_cnp;
1559 struct tmpfs_dirent *de;
1560
1561 switch (ap->a_flags) {
1562 case LOOKUP:
1563 return (0);
1564 case CREATE:
1565 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1566 if (de != NULL)
1567 return (de->td_node == NULL ? 0 : EEXIST);
1568 return (tmpfs_dir_whiteout_add(dvp, cnp));
1569 case DELETE:
1570 tmpfs_dir_whiteout_remove(dvp, cnp);
1571 return (0);
1572 default:
1573 panic("tmpfs_whiteout: unknown op");
1574 }
1575}
1576
1577/* --------------------------------------------------------------------- */
1578
1579/*
1580 * vnode operations vector used for files stored in a tmpfs file system.
1581 */
1582struct vop_vector tmpfs_vnodeop_entries = {
1583 .vop_default = &default_vnodeops,
1584 .vop_lookup = vfs_cache_lookup,
1585 .vop_cachedlookup = tmpfs_lookup,
1586 .vop_create = tmpfs_create,
1587 .vop_mknod = tmpfs_mknod,
1588 .vop_open = tmpfs_open,
1589 .vop_close = tmpfs_close,
1590 .vop_access = tmpfs_access,
1591 .vop_getattr = tmpfs_getattr,
1592 .vop_setattr = tmpfs_setattr,
1593 .vop_read = tmpfs_read,
1594 .vop_write = tmpfs_write,
1595 .vop_fsync = tmpfs_fsync,
1596 .vop_remove = tmpfs_remove,
1597 .vop_link = tmpfs_link,
1598 .vop_rename = tmpfs_rename,
1599 .vop_mkdir = tmpfs_mkdir,
1600 .vop_rmdir = tmpfs_rmdir,
1601 .vop_symlink = tmpfs_symlink,
1602 .vop_readdir = tmpfs_readdir,
1603 .vop_readlink = tmpfs_readlink,
1604 .vop_inactive = tmpfs_inactive,
1605 .vop_reclaim = tmpfs_reclaim,
1606 .vop_print = tmpfs_print,
1607 .vop_pathconf = tmpfs_pathconf,
1608 .vop_vptofh = tmpfs_vptofh,
1609 .vop_whiteout = tmpfs_whiteout,
1610 .vop_bmap = VOP_EOPNOTSUPP,
1611};
1612