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