1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
11 * 2005 program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 /*
36 * tmpfs vnode interface.
37 */
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/dirent.h>
42 #include <sys/extattr.h>
43 #include <sys/fcntl.h>
44 #include <sys/file.h>
45 #include <sys/filio.h>
46 #include <sys/limits.h>
47 #include <sys/lockf.h>
48 #include <sys/lock.h>
49 #include <sys/mount.h>
50 #include <sys/namei.h>
51 #include <sys/priv.h>
52 #include <sys/proc.h>
53 #include <sys/rwlock.h>
54 #include <sys/sched.h>
55 #include <sys/smr.h>
56 #include <sys/stat.h>
57 #include <sys/sysctl.h>
58 #include <sys/unistd.h>
59 #include <sys/vnode.h>
60 #include <security/audit/audit.h>
61 #include <security/mac/mac_framework.h>
62
63 #include <vm/vm.h>
64 #include <vm/vm_param.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_page.h>
67 #include <vm/vm_pager.h>
68 #include <vm/swap_pager.h>
69
70 #include <fs/tmpfs/tmpfs_vnops.h>
71 #include <fs/tmpfs/tmpfs.h>
72
73 SYSCTL_DECL(_vfs_tmpfs);
74 VFS_SMR_DECLARE;
75
76 static volatile int tmpfs_rename_restarts;
77 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
78 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
79 "Times rename had to restart due to lock contention");
80
81 MALLOC_DEFINE(M_TMPFSEA, "tmpfs extattr", "tmpfs extattr structure");
82
83 static int
tmpfs_vn_get_ino_alloc(struct mount * mp,void * arg,int lkflags,struct vnode ** rvp)84 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
85 struct vnode **rvp)
86 {
87
88 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp));
89 }
90
91 static int
tmpfs_lookup1(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp)92 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp)
93 {
94 struct tmpfs_dirent *de;
95 struct tmpfs_node *dnode, *pnode;
96 struct tmpfs_mount *tm;
97 int error;
98
99 /* Caller assumes responsibility for ensuring access (VEXEC). */
100 dnode = VP_TO_TMPFS_DIR(dvp);
101 *vpp = NULL;
102
103 /* We cannot be requesting the parent directory of the root node. */
104 MPASS(IMPLIES(dnode->tn_type == VDIR &&
105 dnode->tn_dir.tn_parent == dnode,
106 !(cnp->cn_flags & ISDOTDOT)));
107
108 TMPFS_ASSERT_LOCKED(dnode);
109 if (dnode->tn_dir.tn_parent == NULL) {
110 error = ENOENT;
111 goto out;
112 }
113 if (cnp->cn_flags & ISDOTDOT) {
114 tm = VFS_TO_TMPFS(dvp->v_mount);
115 pnode = dnode->tn_dir.tn_parent;
116 tmpfs_ref_node(pnode);
117 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
118 pnode, cnp->cn_lkflags, vpp);
119 tmpfs_free_node(tm, pnode);
120 if (error != 0)
121 goto out;
122 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
123 vref(dvp);
124 *vpp = dvp;
125 error = 0;
126 } else {
127 de = tmpfs_dir_lookup(dnode, NULL, cnp);
128 if (de != NULL && de->td_node == NULL)
129 cnp->cn_flags |= ISWHITEOUT;
130 if (de == NULL || de->td_node == NULL) {
131 /*
132 * The entry was not found in the directory.
133 * This is OK if we are creating or renaming an
134 * entry and are working on the last component of
135 * the path name.
136 */
137 if ((cnp->cn_flags & ISLASTCN) &&
138 (cnp->cn_nameiop == CREATE || \
139 cnp->cn_nameiop == RENAME ||
140 (cnp->cn_nameiop == DELETE &&
141 cnp->cn_flags & DOWHITEOUT &&
142 cnp->cn_flags & ISWHITEOUT))) {
143 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
144 curthread);
145 if (error != 0)
146 goto out;
147
148 error = EJUSTRETURN;
149 } else
150 error = ENOENT;
151 } else {
152 struct tmpfs_node *tnode;
153
154 /*
155 * The entry was found, so get its associated
156 * tmpfs_node.
157 */
158 tnode = de->td_node;
159
160 /*
161 * If we are not at the last path component and
162 * found a non-directory or non-link entry (which
163 * may itself be pointing to a directory), raise
164 * an error.
165 */
166 if ((tnode->tn_type != VDIR &&
167 tnode->tn_type != VLNK) &&
168 !(cnp->cn_flags & ISLASTCN)) {
169 error = ENOTDIR;
170 goto out;
171 }
172
173 /*
174 * If we are deleting or renaming the entry, keep
175 * track of its tmpfs_dirent so that it can be
176 * easily deleted later.
177 */
178 if ((cnp->cn_flags & ISLASTCN) &&
179 (cnp->cn_nameiop == DELETE ||
180 cnp->cn_nameiop == RENAME)) {
181 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
182 curthread);
183 if (error != 0)
184 goto out;
185
186 /* Allocate a new vnode on the matching entry. */
187 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
188 cnp->cn_lkflags, vpp);
189 if (error != 0)
190 goto out;
191
192 if ((dnode->tn_mode & S_ISTXT) &&
193 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred,
194 curthread) && VOP_ACCESS(*vpp, VADMIN,
195 cnp->cn_cred, curthread)) {
196 error = EPERM;
197 vput(*vpp);
198 *vpp = NULL;
199 goto out;
200 }
201 } else {
202 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
203 cnp->cn_lkflags, vpp);
204 if (error != 0)
205 goto out;
206 }
207 }
208 }
209
210 /*
211 * Store the result of this lookup in the cache. Avoid this if the
212 * request was for creation, as it does not improve timings on
213 * emprical tests.
214 */
215 if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp))
216 cache_enter(dvp, *vpp, cnp);
217
218 out:
219 #ifdef INVARIANTS
220 /*
221 * If there were no errors, *vpp cannot be null and it must be
222 * locked.
223 */
224 if (error == 0) {
225 MPASS(*vpp != NULL);
226 ASSERT_VOP_LOCKED(*vpp, __func__);
227 } else {
228 MPASS(*vpp == NULL);
229 }
230 #endif
231
232 return (error);
233 }
234
235 static int
tmpfs_cached_lookup(struct vop_cachedlookup_args * v)236 tmpfs_cached_lookup(struct vop_cachedlookup_args *v)
237 {
238
239 return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp));
240 }
241
242 static int
tmpfs_lookup(struct vop_lookup_args * v)243 tmpfs_lookup(struct vop_lookup_args *v)
244 {
245 struct vnode *dvp = v->a_dvp;
246 struct vnode **vpp = v->a_vpp;
247 struct componentname *cnp = v->a_cnp;
248 int error;
249
250 /* Check accessibility of requested node as a first step. */
251 error = vn_dir_check_exec(dvp, cnp);
252 if (error != 0)
253 return (error);
254
255 return (tmpfs_lookup1(dvp, vpp, cnp));
256 }
257
258 static int
tmpfs_create(struct vop_create_args * v)259 tmpfs_create(struct vop_create_args *v)
260 {
261 struct vnode *dvp = v->a_dvp;
262 struct vnode **vpp = v->a_vpp;
263 struct componentname *cnp = v->a_cnp;
264 struct vattr *vap = v->a_vap;
265 int error;
266
267 MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
268
269 error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
270 if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp))
271 cache_enter(dvp, *vpp, cnp);
272 return (error);
273 }
274
275 static int
tmpfs_mknod(struct vop_mknod_args * v)276 tmpfs_mknod(struct vop_mknod_args *v)
277 {
278 struct vnode *dvp = v->a_dvp;
279 struct vnode **vpp = v->a_vpp;
280 struct componentname *cnp = v->a_cnp;
281 struct vattr *vap = v->a_vap;
282
283 if (!VATTR_ISDEV(vap) && vap->va_type != VFIFO)
284 return (EINVAL);
285
286 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL));
287 }
288
289 struct fileops tmpfs_fnops;
290
291 static int
tmpfs_open(struct vop_open_args * v)292 tmpfs_open(struct vop_open_args *v)
293 {
294 struct vnode *vp;
295 struct tmpfs_node *node;
296 struct file *fp;
297 int error, mode;
298
299 vp = v->a_vp;
300 mode = v->a_mode;
301 node = VP_TO_TMPFS_NODE(vp);
302
303 /*
304 * The file is still active but all its names have been removed
305 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
306 * it is about to die.
307 */
308 if (node->tn_links < 1)
309 return (ENOENT);
310
311 /* If the file is marked append-only, deny write requests. */
312 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
313 error = EPERM;
314 else {
315 error = 0;
316 /* For regular files, the call below is nop. */
317 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags &
318 OBJ_DEAD) == 0, ("dead object"));
319 vnode_create_vobject(vp, node->tn_size, v->a_td);
320 }
321
322 fp = v->a_fp;
323 MPASS(fp == NULL || fp->f_data == NULL);
324 if (error == 0 && fp != NULL && vp->v_type == VREG) {
325 tmpfs_ref_node(node);
326 finit_vnode(fp, mode, node, &tmpfs_fnops);
327 }
328
329 return (error);
330 }
331
332 static int
tmpfs_close(struct vop_close_args * v)333 tmpfs_close(struct vop_close_args *v)
334 {
335 struct vnode *vp = v->a_vp;
336
337 /* Update node times. */
338 tmpfs_update(vp);
339
340 return (0);
341 }
342
343 int
tmpfs_fo_close(struct file * fp,struct thread * td)344 tmpfs_fo_close(struct file *fp, struct thread *td)
345 {
346 struct tmpfs_node *node;
347
348 node = fp->f_data;
349 if (node != NULL) {
350 MPASS(node->tn_type == VREG);
351 tmpfs_free_node(node->tn_reg.tn_tmp, node);
352 }
353 return (vnops.fo_close(fp, td));
354 }
355
356 /*
357 * VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see
358 * the comment above cache_fplookup for details.
359 */
360 int
tmpfs_fplookup_vexec(struct vop_fplookup_vexec_args * v)361 tmpfs_fplookup_vexec(struct vop_fplookup_vexec_args *v)
362 {
363 struct vnode *vp;
364 struct tmpfs_node *node;
365 struct ucred *cred;
366 mode_t all_x, mode;
367
368 vp = v->a_vp;
369 node = VP_TO_TMPFS_NODE_SMR(vp);
370 if (__predict_false(node == NULL))
371 return (EAGAIN);
372
373 all_x = S_IXUSR | S_IXGRP | S_IXOTH;
374 mode = atomic_load_short(&node->tn_mode);
375 if (__predict_true((mode & all_x) == all_x))
376 return (0);
377
378 cred = v->a_cred;
379 return (vaccess_vexec_smr(mode, node->tn_uid, node->tn_gid, cred));
380 }
381
382 static int
tmpfs_access_locked(struct vnode * vp,struct tmpfs_node * node,accmode_t accmode,struct ucred * cred)383 tmpfs_access_locked(struct vnode *vp, struct tmpfs_node *node,
384 accmode_t accmode, struct ucred *cred)
385 {
386 #ifdef INVARIANTS
387 if (!mtx_owned(TMPFS_NODE_MTX(node))) {
388 ASSERT_VOP_LOCKED(vp,
389 "tmpfs_access_locked needs locked vnode or node");
390 }
391 #endif
392
393 if ((accmode & VWRITE) != 0 && (node->tn_flags & IMMUTABLE) != 0)
394 return (EPERM);
395 return (vaccess(vp->v_type, node->tn_mode, node->tn_uid, node->tn_gid,
396 accmode, cred));
397 }
398
399 int
tmpfs_access(struct vop_access_args * v)400 tmpfs_access(struct vop_access_args *v)
401 {
402 struct vnode *vp = v->a_vp;
403 struct ucred *cred = v->a_cred;
404 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp);
405 mode_t all_x = S_IXUSR | S_IXGRP | S_IXOTH;
406 accmode_t accmode = v->a_accmode;
407
408 /*
409 * Common case path lookup.
410 */
411 if (__predict_true(accmode == VEXEC &&
412 (node->tn_mode & all_x) == all_x))
413 return (0);
414
415 switch (vp->v_type) {
416 case VDIR:
417 /* FALLTHROUGH */
418 case VLNK:
419 /* FALLTHROUGH */
420 case VREG:
421 if ((accmode & VWRITE) != 0 &&
422 (vp->v_mount->mnt_flag & MNT_RDONLY) != 0)
423 return (EROFS);
424 break;
425
426 case VBLK:
427 /* FALLTHROUGH */
428 case VCHR:
429 /* FALLTHROUGH */
430 case VSOCK:
431 /* FALLTHROUGH */
432 case VFIFO:
433 break;
434
435 default:
436 return (EINVAL);
437 }
438
439 return (tmpfs_access_locked(vp, node, accmode, cred));
440 }
441
442 int
tmpfs_stat(struct vop_stat_args * v)443 tmpfs_stat(struct vop_stat_args *v)
444 {
445 struct vnode *vp = v->a_vp;
446 struct stat *sb = v->a_sb;
447 struct tmpfs_node *node;
448 int error;
449
450 node = VP_TO_TMPFS_NODE(vp);
451
452 tmpfs_update_getattr(vp);
453
454 error = vop_stat_helper_pre(v);
455 if (__predict_false(error))
456 return (error);
457
458 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
459 sb->st_ino = node->tn_id;
460 sb->st_mode = node->tn_mode | VTTOIF(vp->v_type);
461 sb->st_nlink = node->tn_links;
462 sb->st_uid = node->tn_uid;
463 sb->st_gid = node->tn_gid;
464 sb->st_rdev = VN_ISDEV(vp) ? node->tn_rdev : NODEV;
465 sb->st_size = node->tn_size;
466 sb->st_atim.tv_sec = node->tn_atime.tv_sec;
467 sb->st_atim.tv_nsec = node->tn_atime.tv_nsec;
468 sb->st_mtim.tv_sec = node->tn_mtime.tv_sec;
469 sb->st_mtim.tv_nsec = node->tn_mtime.tv_nsec;
470 sb->st_ctim.tv_sec = node->tn_ctime.tv_sec;
471 sb->st_ctim.tv_nsec = node->tn_ctime.tv_nsec;
472 sb->st_birthtim.tv_sec = node->tn_birthtime.tv_sec;
473 sb->st_birthtim.tv_nsec = node->tn_birthtime.tv_nsec;
474 sb->st_blksize = PAGE_SIZE;
475 sb->st_flags = node->tn_flags;
476 sb->st_gen = node->tn_gen;
477 sb->st_filerev = 0;
478 if (vp->v_type == VREG) {
479 #ifdef __ILP32__
480 vm_object_t obj = node->tn_reg.tn_aobj;
481
482 /* Handle torn read */
483 VM_OBJECT_RLOCK(obj);
484 #endif
485 sb->st_blocks = ptoa(node->tn_reg.tn_pages);
486 #ifdef __ILP32__
487 VM_OBJECT_RUNLOCK(obj);
488 #endif
489 } else {
490 sb->st_blocks = node->tn_size;
491 }
492 sb->st_blocks /= S_BLKSIZE;
493 return (vop_stat_helper_post(v, error));
494 }
495
496 int
tmpfs_getattr(struct vop_getattr_args * v)497 tmpfs_getattr(struct vop_getattr_args *v)
498 {
499 struct vnode *vp = v->a_vp;
500 struct vattr *vap = v->a_vap;
501 struct tmpfs_node *node;
502
503 node = VP_TO_TMPFS_NODE(vp);
504
505 tmpfs_update_getattr(vp);
506
507 vap->va_type = vp->v_type;
508 vap->va_mode = node->tn_mode;
509 vap->va_nlink = node->tn_links;
510 vap->va_uid = node->tn_uid;
511 vap->va_gid = node->tn_gid;
512 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
513 vap->va_fileid = node->tn_id;
514 vap->va_size = node->tn_size;
515 vap->va_blocksize = PAGE_SIZE;
516 vap->va_atime = node->tn_atime;
517 vap->va_mtime = node->tn_mtime;
518 vap->va_ctime = node->tn_ctime;
519 vap->va_birthtime = node->tn_birthtime;
520 vap->va_gen = node->tn_gen;
521 vap->va_flags = node->tn_flags;
522 vap->va_rdev = VN_ISDEV(vp) ? node->tn_rdev : NODEV;
523 if (vp->v_type == VREG) {
524 #ifdef __ILP32__
525 vm_object_t obj = node->tn_reg.tn_aobj;
526
527 VM_OBJECT_RLOCK(obj);
528 #endif
529 vap->va_bytes = ptoa(node->tn_reg.tn_pages);
530 #ifdef __ILP32__
531 VM_OBJECT_RUNLOCK(obj);
532 #endif
533 } else {
534 vap->va_bytes = node->tn_size;
535 }
536 vap->va_filerev = 0;
537
538 return (0);
539 }
540
541 int
tmpfs_setattr(struct vop_setattr_args * v)542 tmpfs_setattr(struct vop_setattr_args *v)
543 {
544 struct vnode *vp = v->a_vp;
545 struct vattr *vap = v->a_vap;
546 struct ucred *cred = v->a_cred;
547 struct thread *td = curthread;
548
549 int error;
550
551 ASSERT_VOP_IN_SEQC(vp);
552
553 error = 0;
554
555 /* Abort if any unsettable attribute is given. */
556 if (vap->va_type != VNON ||
557 vap->va_nlink != VNOVAL ||
558 vap->va_fsid != VNOVAL ||
559 vap->va_fileid != VNOVAL ||
560 vap->va_blocksize != VNOVAL ||
561 vap->va_gen != VNOVAL ||
562 vap->va_rdev != VNOVAL ||
563 vap->va_bytes != VNOVAL)
564 error = EINVAL;
565
566 if (error == 0 && (vap->va_flags != VNOVAL))
567 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
568
569 if (error == 0 && (vap->va_size != VNOVAL))
570 error = tmpfs_chsize(vp, vap->va_size, cred, td);
571
572 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
573 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
574
575 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
576 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
577
578 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
579 vap->va_atime.tv_nsec != VNOVAL) ||
580 (vap->va_mtime.tv_sec != VNOVAL &&
581 vap->va_mtime.tv_nsec != VNOVAL) ||
582 (vap->va_birthtime.tv_sec != VNOVAL &&
583 vap->va_birthtime.tv_nsec != VNOVAL)))
584 error = tmpfs_chtimes(vp, vap, cred, td);
585
586 /*
587 * Update the node times. We give preference to the error codes
588 * generated by this function rather than the ones that may arise
589 * from tmpfs_update.
590 */
591 tmpfs_update(vp);
592
593 return (error);
594 }
595
596 static int
tmpfs_read(struct vop_read_args * v)597 tmpfs_read(struct vop_read_args *v)
598 {
599 struct vnode *vp;
600 struct uio *uio;
601 struct tmpfs_node *node;
602
603 vp = v->a_vp;
604 if (vp->v_type != VREG)
605 return (EISDIR);
606 uio = v->a_uio;
607 if (uio->uio_offset < 0)
608 return (EINVAL);
609 node = VP_TO_TMPFS_NODE(vp);
610 tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node);
611 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
612 }
613
614 static int
tmpfs_read_pgcache(struct vop_read_pgcache_args * v)615 tmpfs_read_pgcache(struct vop_read_pgcache_args *v)
616 {
617 struct vnode *vp;
618 struct tmpfs_node *node;
619 vm_object_t object;
620 off_t size;
621 int error;
622
623 vp = v->a_vp;
624 VNPASS((vn_irflag_read(vp) & VIRF_PGREAD) != 0, vp);
625
626 if (v->a_uio->uio_offset < 0)
627 return (EINVAL);
628
629 error = EJUSTRETURN;
630 vfs_smr_enter();
631
632 node = VP_TO_TMPFS_NODE_SMR(vp);
633 if (node == NULL)
634 goto out_smr;
635 MPASS(node->tn_type == VREG);
636 MPASS(node->tn_refcount >= 1);
637 object = node->tn_reg.tn_aobj;
638 if (object == NULL)
639 goto out_smr;
640
641 MPASS(object->type == tmpfs_pager_type);
642 MPASS((object->flags & (OBJ_ANON | OBJ_DEAD | OBJ_SWAP)) ==
643 OBJ_SWAP);
644 if (!VN_IS_DOOMED(vp)) {
645 /* size cannot become shorter due to rangelock. */
646 size = node->tn_size;
647 tmpfs_set_accessed(node->tn_reg.tn_tmp, node);
648 vfs_smr_exit();
649 error = uiomove_object(object, size, v->a_uio);
650 return (error);
651 }
652 out_smr:
653 vfs_smr_exit();
654 return (error);
655 }
656
657 static int
tmpfs_write(struct vop_write_args * v)658 tmpfs_write(struct vop_write_args *v)
659 {
660 struct vnode *vp;
661 struct uio *uio;
662 struct tmpfs_node *node;
663 off_t oldsize;
664 ssize_t r;
665 int error, ioflag;
666 mode_t newmode;
667
668 vp = v->a_vp;
669 uio = v->a_uio;
670 ioflag = v->a_ioflag;
671 error = 0;
672 node = VP_TO_TMPFS_NODE(vp);
673 oldsize = node->tn_size;
674
675 if (uio->uio_offset < 0 || vp->v_type != VREG)
676 return (EINVAL);
677 if (uio->uio_resid == 0)
678 return (0);
679 if (ioflag & IO_APPEND)
680 uio->uio_offset = node->tn_size;
681 error = vn_rlimit_fsizex(vp, uio, VFS_TO_TMPFS(vp->v_mount)->
682 tm_maxfilesize, &r, uio->uio_td);
683 if (error != 0) {
684 vn_rlimit_fsizex_res(uio, r);
685 return (error);
686 }
687
688 if (uio->uio_offset + uio->uio_resid > node->tn_size) {
689 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
690 FALSE);
691 if (error != 0)
692 goto out;
693 }
694
695 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
696 node->tn_status |= TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED;
697 node->tn_accessed = true;
698 if (node->tn_mode & (S_ISUID | S_ISGID)) {
699 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID)) {
700 newmode = node->tn_mode & ~(S_ISUID | S_ISGID);
701 vn_seqc_write_begin(vp);
702 atomic_store_short(&node->tn_mode, newmode);
703 vn_seqc_write_end(vp);
704 }
705 }
706 if (error != 0)
707 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
708
709 out:
710 MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
711 MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
712
713 vn_rlimit_fsizex_res(uio, r);
714 return (error);
715 }
716
717 static int
tmpfs_deallocate(struct vop_deallocate_args * v)718 tmpfs_deallocate(struct vop_deallocate_args *v)
719 {
720 return (tmpfs_reg_punch_hole(v->a_vp, v->a_offset, v->a_len));
721 }
722
723 static int
tmpfs_fsync(struct vop_fsync_args * v)724 tmpfs_fsync(struct vop_fsync_args *v)
725 {
726 struct vnode *vp = v->a_vp;
727
728 tmpfs_check_mtime(vp);
729 tmpfs_update(vp);
730
731 return (0);
732 }
733
734 static int
tmpfs_remove(struct vop_remove_args * v)735 tmpfs_remove(struct vop_remove_args *v)
736 {
737 struct vnode *dvp = v->a_dvp;
738 struct vnode *vp = v->a_vp;
739
740 int error;
741 struct tmpfs_dirent *de;
742 struct tmpfs_mount *tmp;
743 struct tmpfs_node *dnode;
744 struct tmpfs_node *node;
745
746 if (vp->v_type == VDIR) {
747 error = EISDIR;
748 goto out;
749 }
750
751 dnode = VP_TO_TMPFS_DIR(dvp);
752 node = VP_TO_TMPFS_NODE(vp);
753 tmp = VFS_TO_TMPFS(vp->v_mount);
754 de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
755 MPASS(de != NULL);
756
757 /* Files marked as immutable or append-only cannot be deleted. */
758 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
759 (dnode->tn_flags & APPEND)) {
760 error = EPERM;
761 goto out;
762 }
763
764 /* Remove the entry from the directory; as it is a file, we do not
765 * have to change the number of hard links of the directory. */
766 tmpfs_dir_detach(dvp, de);
767 if (v->a_cnp->cn_flags & DOWHITEOUT)
768 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
769
770 /* Free the directory entry we just deleted. Note that the node
771 * referred by it will not be removed until the vnode is really
772 * reclaimed. */
773 tmpfs_free_dirent(tmp, de);
774
775 node->tn_status |= TMPFS_NODE_CHANGED;
776 node->tn_accessed = true;
777 error = 0;
778
779 out:
780 return (error);
781 }
782
783 static int
tmpfs_link(struct vop_link_args * v)784 tmpfs_link(struct vop_link_args *v)
785 {
786 struct vnode *dvp = v->a_tdvp;
787 struct vnode *vp = v->a_vp;
788 struct componentname *cnp = v->a_cnp;
789
790 int error;
791 struct tmpfs_dirent *de;
792 struct tmpfs_node *node;
793
794 MPASS(dvp != vp); /* XXX When can this be false? */
795 node = VP_TO_TMPFS_NODE(vp);
796
797 /* Ensure that we do not overflow the maximum number of links imposed
798 * by the system. */
799 MPASS(node->tn_links <= TMPFS_LINK_MAX);
800 if (node->tn_links == TMPFS_LINK_MAX) {
801 error = EMLINK;
802 goto out;
803 }
804
805 /* We cannot create links of files marked immutable or append-only. */
806 if (node->tn_flags & (IMMUTABLE | APPEND)) {
807 error = EPERM;
808 goto out;
809 }
810
811 /* Allocate a new directory entry to represent the node. */
812 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
813 cnp->cn_nameptr, cnp->cn_namelen, &de);
814 if (error != 0)
815 goto out;
816
817 /* Insert the new directory entry into the appropriate directory. */
818 if (cnp->cn_flags & ISWHITEOUT)
819 tmpfs_dir_whiteout_remove(dvp, cnp);
820 tmpfs_dir_attach(dvp, de);
821
822 /* vp link count has changed, so update node times. */
823 node->tn_status |= TMPFS_NODE_CHANGED;
824 tmpfs_update(vp);
825
826 error = 0;
827
828 out:
829 return (error);
830 }
831
832 /*
833 * We acquire all but fdvp locks using non-blocking acquisitions. If we
834 * fail to acquire any lock in the path we will drop all held locks,
835 * acquire the new lock in a blocking fashion, and then release it and
836 * restart the rename. This acquire/release step ensures that we do not
837 * spin on a lock waiting for release. On error release all vnode locks
838 * and decrement references the way tmpfs_rename() would do.
839 */
840 static int
tmpfs_rename_relock(struct vnode * fdvp,struct vnode ** fvpp,struct vnode * tdvp,struct vnode ** tvpp,struct componentname * fcnp,struct componentname * tcnp)841 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
842 struct vnode *tdvp, struct vnode **tvpp,
843 struct componentname *fcnp, struct componentname *tcnp)
844 {
845 struct vnode *nvp;
846 struct mount *mp;
847 struct tmpfs_dirent *de;
848 int error, restarts = 0;
849
850 VOP_UNLOCK(tdvp);
851 if (*tvpp != NULL && *tvpp != tdvp)
852 VOP_UNLOCK(*tvpp);
853 mp = fdvp->v_mount;
854
855 relock:
856 restarts += 1;
857 error = vn_lock(fdvp, LK_EXCLUSIVE);
858 if (error)
859 goto releout;
860 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
861 VOP_UNLOCK(fdvp);
862 error = vn_lock(tdvp, LK_EXCLUSIVE);
863 if (error)
864 goto releout;
865 VOP_UNLOCK(tdvp);
866 goto relock;
867 }
868 /*
869 * Re-resolve fvp to be certain it still exists and fetch the
870 * correct vnode.
871 */
872 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
873 if (de == NULL) {
874 VOP_UNLOCK(fdvp);
875 VOP_UNLOCK(tdvp);
876 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
877 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
878 error = EINVAL;
879 else
880 error = ENOENT;
881 goto releout;
882 }
883 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
884 if (error != 0) {
885 VOP_UNLOCK(fdvp);
886 VOP_UNLOCK(tdvp);
887 if (error != EBUSY)
888 goto releout;
889 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
890 if (error != 0)
891 goto releout;
892 VOP_UNLOCK(nvp);
893 /*
894 * Concurrent rename race.
895 */
896 if (nvp == tdvp) {
897 vrele(nvp);
898 error = EINVAL;
899 goto releout;
900 }
901 vrele(*fvpp);
902 *fvpp = nvp;
903 goto relock;
904 }
905 vrele(*fvpp);
906 *fvpp = nvp;
907 VOP_UNLOCK(*fvpp);
908 /*
909 * Re-resolve tvp and acquire the vnode lock if present.
910 */
911 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
912 /*
913 * If tvp disappeared we just carry on.
914 */
915 if (de == NULL && *tvpp != NULL) {
916 vrele(*tvpp);
917 *tvpp = NULL;
918 }
919 /*
920 * Get the tvp ino if the lookup succeeded. We may have to restart
921 * if the non-blocking acquire fails.
922 */
923 if (de != NULL) {
924 nvp = NULL;
925 error = tmpfs_alloc_vp(mp, de->td_node,
926 LK_EXCLUSIVE | LK_NOWAIT, &nvp);
927 if (*tvpp != NULL)
928 vrele(*tvpp);
929 *tvpp = nvp;
930 if (error != 0) {
931 VOP_UNLOCK(fdvp);
932 VOP_UNLOCK(tdvp);
933 if (error != EBUSY)
934 goto releout;
935 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
936 &nvp);
937 if (error != 0)
938 goto releout;
939 VOP_UNLOCK(nvp);
940 /*
941 * fdvp contains fvp, thus tvp (=fdvp) is not empty.
942 */
943 if (nvp == fdvp) {
944 error = ENOTEMPTY;
945 goto releout;
946 }
947 goto relock;
948 }
949 }
950 tmpfs_rename_restarts += restarts;
951
952 return (0);
953
954 releout:
955 vrele(fdvp);
956 vrele(*fvpp);
957 vrele(tdvp);
958 if (*tvpp != NULL)
959 vrele(*tvpp);
960 tmpfs_rename_restarts += restarts;
961
962 return (error);
963 }
964
965 static int
tmpfs_rename(struct vop_rename_args * v)966 tmpfs_rename(struct vop_rename_args *v)
967 {
968 struct vnode *fdvp = v->a_fdvp;
969 struct vnode *fvp = v->a_fvp;
970 struct componentname *fcnp = v->a_fcnp;
971 struct vnode *tdvp = v->a_tdvp;
972 struct vnode *tvp = v->a_tvp;
973 struct componentname *tcnp = v->a_tcnp;
974 char *newname;
975 struct tmpfs_dirent *de;
976 struct tmpfs_mount *tmp;
977 struct tmpfs_node *fdnode;
978 struct tmpfs_node *fnode;
979 struct tmpfs_node *tnode;
980 struct tmpfs_node *tdnode;
981 int error;
982 bool want_seqc_end;
983
984 want_seqc_end = false;
985
986 /*
987 * Disallow cross-device renames.
988 * XXX Why isn't this done by the caller?
989 */
990 if (fvp->v_mount != tdvp->v_mount ||
991 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
992 error = EXDEV;
993 goto out;
994 }
995
996 if ((v->a_flags & ~(AT_RENAME_NOREPLACE)) != 0) {
997 error = EOPNOTSUPP;
998 goto out;
999 }
1000
1001 /* If source and target are the same file, there is nothing to do. */
1002 if (fvp == tvp) {
1003 error = 0;
1004 goto out;
1005 }
1006
1007 /*
1008 * If we need to move the directory between entries, lock the
1009 * source so that we can safely operate on it.
1010 */
1011 if (fdvp != tdvp && fdvp != tvp) {
1012 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
1013 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
1014 fcnp, tcnp);
1015 if (error != 0)
1016 return (error);
1017 ASSERT_VOP_ELOCKED(fdvp,
1018 "tmpfs_rename: fdvp not locked");
1019 ASSERT_VOP_ELOCKED(tdvp,
1020 "tmpfs_rename: tdvp not locked");
1021 if (tvp != NULL) {
1022 ASSERT_VOP_ELOCKED(tvp,
1023 "tmpfs_rename: tvp not locked");
1024 if ((v->a_flags & AT_RENAME_NOREPLACE) != 0) {
1025 error = EEXIST;
1026 goto out_locked;
1027 }
1028 }
1029 if (fvp == tvp) {
1030 error = 0;
1031 goto out_locked;
1032 }
1033 }
1034 }
1035
1036 /*
1037 * Avoid manipulating '.' and '..' entries.
1038 */
1039 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
1040 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) {
1041 error = EINVAL;
1042 goto out_locked;
1043 }
1044
1045 if (tvp != NULL)
1046 vn_seqc_write_begin(tvp);
1047 vn_seqc_write_begin(tdvp);
1048 vn_seqc_write_begin(fvp);
1049 vn_seqc_write_begin(fdvp);
1050 want_seqc_end = true;
1051
1052 tmp = VFS_TO_TMPFS(tdvp->v_mount);
1053 tdnode = VP_TO_TMPFS_DIR(tdvp);
1054 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
1055 fdnode = VP_TO_TMPFS_DIR(fdvp);
1056 fnode = VP_TO_TMPFS_NODE(fvp);
1057 de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
1058
1059 /*
1060 * Entry can disappear before we lock fdvp.
1061 */
1062 if (de == NULL) {
1063 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
1064 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
1065 error = EINVAL;
1066 else
1067 error = ENOENT;
1068 goto out_locked;
1069 }
1070 MPASS(de->td_node == fnode);
1071
1072 /*
1073 * If re-naming a directory to another preexisting directory
1074 * ensure that the target directory is empty so that its
1075 * removal causes no side effects.
1076 * Kern_rename guarantees the destination to be a directory
1077 * if the source is one.
1078 */
1079 if (tvp != NULL) {
1080 MPASS(tnode != NULL);
1081
1082 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
1083 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
1084 error = EPERM;
1085 goto out_locked;
1086 }
1087
1088 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
1089 if (tnode->tn_size != 0 &&
1090 ((tcnp->cn_flags & IGNOREWHITEOUT) == 0 ||
1091 tnode->tn_size > tnode->tn_dir.tn_wht_size)) {
1092 error = ENOTEMPTY;
1093 goto out_locked;
1094 }
1095 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1096 error = ENOTDIR;
1097 goto out_locked;
1098 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1099 error = EISDIR;
1100 goto out_locked;
1101 } else {
1102 MPASS(fnode->tn_type != VDIR &&
1103 tnode->tn_type != VDIR);
1104 }
1105 }
1106
1107 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
1108 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1109 error = EPERM;
1110 goto out_locked;
1111 }
1112
1113 /*
1114 * Ensure that we have enough memory to hold the new name, if it
1115 * has to be changed.
1116 */
1117 if (fcnp->cn_namelen != tcnp->cn_namelen ||
1118 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
1119 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
1120 } else
1121 newname = NULL;
1122
1123 /*
1124 * If the node is being moved to another directory, we have to do
1125 * the move.
1126 */
1127 if (fdnode != tdnode) {
1128 /*
1129 * In case we are moving a directory, we have to adjust its
1130 * parent to point to the new parent.
1131 */
1132 if (de->td_node->tn_type == VDIR) {
1133 struct tmpfs_node *n;
1134
1135 TMPFS_NODE_LOCK(fnode);
1136 error = tmpfs_access_locked(fvp, fnode, VWRITE,
1137 tcnp->cn_cred);
1138 TMPFS_NODE_UNLOCK(fnode);
1139 if (error) {
1140 if (newname != NULL)
1141 free(newname, M_TMPFSNAME);
1142 goto out_locked;
1143 }
1144
1145 /*
1146 * Ensure the target directory is not a child of the
1147 * directory being moved. Otherwise, we'd end up
1148 * with stale nodes.
1149 */
1150 n = tdnode;
1151 /*
1152 * TMPFS_LOCK guaranties that no nodes are freed while
1153 * traversing the list. Nodes can only be marked as
1154 * removed: tn_parent == NULL.
1155 */
1156 TMPFS_LOCK(tmp);
1157 TMPFS_NODE_LOCK(n);
1158 while (n != n->tn_dir.tn_parent) {
1159 struct tmpfs_node *parent;
1160
1161 if (n == fnode) {
1162 TMPFS_NODE_UNLOCK(n);
1163 TMPFS_UNLOCK(tmp);
1164 error = EINVAL;
1165 if (newname != NULL)
1166 free(newname, M_TMPFSNAME);
1167 goto out_locked;
1168 }
1169 parent = n->tn_dir.tn_parent;
1170 TMPFS_NODE_UNLOCK(n);
1171 if (parent == NULL) {
1172 n = NULL;
1173 break;
1174 }
1175 TMPFS_NODE_LOCK(parent);
1176 if (parent->tn_dir.tn_parent == NULL) {
1177 TMPFS_NODE_UNLOCK(parent);
1178 n = NULL;
1179 break;
1180 }
1181 n = parent;
1182 }
1183 TMPFS_UNLOCK(tmp);
1184 if (n == NULL) {
1185 error = EINVAL;
1186 if (newname != NULL)
1187 free(newname, M_TMPFSNAME);
1188 goto out_locked;
1189 }
1190 TMPFS_NODE_UNLOCK(n);
1191
1192 /* Adjust the parent pointer. */
1193 TMPFS_VALIDATE_DIR(fnode);
1194 TMPFS_NODE_LOCK(de->td_node);
1195 de->td_node->tn_dir.tn_parent = tdnode;
1196 TMPFS_NODE_UNLOCK(de->td_node);
1197
1198 /*
1199 * As a result of changing the target of the '..'
1200 * entry, the link count of the source and target
1201 * directories has to be adjusted.
1202 */
1203 TMPFS_NODE_LOCK(tdnode);
1204 TMPFS_ASSERT_LOCKED(tdnode);
1205 tdnode->tn_links++;
1206 TMPFS_NODE_UNLOCK(tdnode);
1207
1208 TMPFS_NODE_LOCK(fdnode);
1209 TMPFS_ASSERT_LOCKED(fdnode);
1210 fdnode->tn_links--;
1211 TMPFS_NODE_UNLOCK(fdnode);
1212 }
1213 }
1214
1215 /*
1216 * Do the move: just remove the entry from the source directory
1217 * and insert it into the target one.
1218 */
1219 tmpfs_dir_detach(fdvp, de);
1220
1221 if (fcnp->cn_flags & DOWHITEOUT)
1222 tmpfs_dir_whiteout_add(fdvp, fcnp);
1223 if (tcnp->cn_flags & ISWHITEOUT)
1224 tmpfs_dir_whiteout_remove(tdvp, tcnp);
1225
1226 /*
1227 * If the name has changed, we need to make it effective by changing
1228 * it in the directory entry.
1229 */
1230 if (newname != NULL) {
1231 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
1232
1233 free(de->ud.td_name, M_TMPFSNAME);
1234 de->ud.td_name = newname;
1235 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
1236
1237 fnode->tn_status |= TMPFS_NODE_CHANGED;
1238 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1239 }
1240
1241 /*
1242 * If we are overwriting an entry, we have to remove the old one
1243 * from the target directory.
1244 */
1245 if (tvp != NULL) {
1246 struct tmpfs_dirent *tde;
1247
1248 /* Remove the old entry from the target directory. */
1249 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
1250 tmpfs_dir_detach(tdvp, tde);
1251
1252 /*
1253 * If we are overwriting a directory, per the ENOTEMPTY check
1254 * above it must either be empty or contain only whiteout
1255 * entries. In the latter case (which can only happen if
1256 * IGNOREWHITEOUT was passed in tcnp->cn_flags), clear the
1257 * whiteout entries to avoid leaking memory.
1258 */
1259 if (tnode->tn_type == VDIR && tnode->tn_size > 0)
1260 tmpfs_dir_clear_whiteouts(tvp);
1261
1262 /* Update node's ctime because of possible hardlinks. */
1263 tnode->tn_status |= TMPFS_NODE_CHANGED;
1264 tmpfs_update(tvp);
1265
1266 /*
1267 * Free the directory entry we just deleted. Note that the
1268 * node referred by it will not be removed until the vnode is
1269 * really reclaimed.
1270 */
1271 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
1272 }
1273
1274 tmpfs_dir_attach(tdvp, de);
1275
1276 if (tmpfs_use_nc(fvp)) {
1277 cache_vop_rename(fdvp, fvp, tdvp, tvp, fcnp, tcnp);
1278 }
1279
1280 error = 0;
1281
1282 out_locked:
1283 if (fdvp != tdvp && fdvp != tvp)
1284 VOP_UNLOCK(fdvp);
1285
1286 out:
1287 if (want_seqc_end) {
1288 if (tvp != NULL)
1289 vn_seqc_write_end(tvp);
1290 vn_seqc_write_end(tdvp);
1291 vn_seqc_write_end(fvp);
1292 vn_seqc_write_end(fdvp);
1293 }
1294
1295 /*
1296 * Release target nodes.
1297 * XXX: I don't understand when tdvp can be the same as tvp, but
1298 * other code takes care of this...
1299 */
1300 if (tdvp == tvp)
1301 vrele(tdvp);
1302 else
1303 vput(tdvp);
1304 if (tvp != NULL)
1305 vput(tvp);
1306
1307 /* Release source nodes. */
1308 vrele(fdvp);
1309 vrele(fvp);
1310
1311 return (error);
1312 }
1313
1314 static int
tmpfs_mkdir(struct vop_mkdir_args * v)1315 tmpfs_mkdir(struct vop_mkdir_args *v)
1316 {
1317 struct vnode *dvp = v->a_dvp;
1318 struct vnode **vpp = v->a_vpp;
1319 struct componentname *cnp = v->a_cnp;
1320 struct vattr *vap = v->a_vap;
1321
1322 MPASS(vap->va_type == VDIR);
1323
1324 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL));
1325 }
1326
1327 static int
tmpfs_rmdir(struct vop_rmdir_args * v)1328 tmpfs_rmdir(struct vop_rmdir_args *v)
1329 {
1330 struct vnode *dvp = v->a_dvp;
1331 struct vnode *vp = v->a_vp;
1332 struct componentname *cnp = v->a_cnp;
1333
1334 int error;
1335 struct tmpfs_dirent *de;
1336 struct tmpfs_mount *tmp;
1337 struct tmpfs_node *dnode;
1338 struct tmpfs_node *node;
1339
1340 tmp = VFS_TO_TMPFS(dvp->v_mount);
1341 dnode = VP_TO_TMPFS_DIR(dvp);
1342 node = VP_TO_TMPFS_DIR(vp);
1343
1344 /*
1345 * Directories with more than two non-whiteout entries ('.' and '..')
1346 * cannot be removed.
1347 */
1348 if (node->tn_size != 0 &&
1349 ((cnp->cn_flags & IGNOREWHITEOUT) == 0 ||
1350 node->tn_size > node->tn_dir.tn_wht_size)) {
1351 error = ENOTEMPTY;
1352 goto out;
1353 }
1354
1355 /* Check flags to see if we are allowed to remove the directory. */
1356 if ((dnode->tn_flags & APPEND)
1357 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1358 error = EPERM;
1359 goto out;
1360 }
1361
1362 /* This invariant holds only if we are not trying to remove "..".
1363 * We checked for that above so this is safe now. */
1364 MPASS(node->tn_dir.tn_parent == dnode);
1365
1366 /* Get the directory entry associated with node (vp). This was
1367 * filled by tmpfs_lookup while looking up the entry. */
1368 de = tmpfs_dir_lookup(dnode, node, cnp);
1369 MPASS(TMPFS_DIRENT_MATCHES(de,
1370 cnp->cn_nameptr,
1371 cnp->cn_namelen));
1372
1373 /* Detach the directory entry from the directory (dnode). */
1374 tmpfs_dir_detach(dvp, de);
1375
1376 /*
1377 * If we are removing a directory, per the ENOTEMPTY check above it
1378 * must either be empty or contain only whiteout entries. In the
1379 * latter case (which can only happen if IGNOREWHITEOUT was passed
1380 * in cnp->cn_flags), clear the whiteout entries to avoid leaking
1381 * memory.
1382 */
1383 if (node->tn_size > 0)
1384 tmpfs_dir_clear_whiteouts(vp);
1385
1386 if (cnp->cn_flags & DOWHITEOUT)
1387 tmpfs_dir_whiteout_add(dvp, cnp);
1388
1389 /* No vnode should be allocated for this entry from this point */
1390 TMPFS_NODE_LOCK(node);
1391 node->tn_links--;
1392 node->tn_dir.tn_parent = NULL;
1393 node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1394 node->tn_accessed = true;
1395
1396 TMPFS_NODE_UNLOCK(node);
1397
1398 TMPFS_NODE_LOCK(dnode);
1399 dnode->tn_links--;
1400 dnode->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1401 dnode->tn_accessed = true;
1402 TMPFS_NODE_UNLOCK(dnode);
1403
1404 if (tmpfs_use_nc(dvp)) {
1405 cache_vop_rmdir(dvp, vp);
1406 }
1407
1408 /* Free the directory entry we just deleted. Note that the node
1409 * referred by it will not be removed until the vnode is really
1410 * reclaimed. */
1411 tmpfs_free_dirent(tmp, de);
1412
1413 /* Release the deleted vnode (will destroy the node, notify
1414 * interested parties and clean it from the cache). */
1415
1416 dnode->tn_status |= TMPFS_NODE_CHANGED;
1417 tmpfs_update(dvp);
1418
1419 error = 0;
1420
1421 out:
1422 return (error);
1423 }
1424
1425 static int
tmpfs_symlink(struct vop_symlink_args * v)1426 tmpfs_symlink(struct vop_symlink_args *v)
1427 {
1428 struct vnode *dvp = v->a_dvp;
1429 struct vnode **vpp = v->a_vpp;
1430 struct componentname *cnp = v->a_cnp;
1431 struct vattr *vap = v->a_vap;
1432 const char *target = v->a_target;
1433
1434 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
1435 MPASS(vap->va_type == VLNK);
1436 #else
1437 vap->va_type = VLNK;
1438 #endif
1439
1440 return (tmpfs_alloc_file(dvp, vpp, vap, cnp, target));
1441 }
1442
1443 static int
tmpfs_readdir(struct vop_readdir_args * va)1444 tmpfs_readdir(struct vop_readdir_args *va)
1445 {
1446 struct vnode *vp;
1447 struct uio *uio;
1448 struct tmpfs_mount *tm;
1449 struct tmpfs_node *node;
1450 uint64_t **cookies;
1451 int *eofflag, *ncookies;
1452 ssize_t startresid;
1453 int error, maxcookies;
1454
1455 vp = va->a_vp;
1456 uio = va->a_uio;
1457 eofflag = va->a_eofflag;
1458 cookies = va->a_cookies;
1459 ncookies = va->a_ncookies;
1460
1461 /* This operation only makes sense on directory nodes. */
1462 if (vp->v_type != VDIR)
1463 return (ENOTDIR);
1464
1465 maxcookies = 0;
1466 node = VP_TO_TMPFS_DIR(vp);
1467 tm = VFS_TO_TMPFS(vp->v_mount);
1468
1469 startresid = uio->uio_resid;
1470
1471 /* Allocate cookies for NFS and compat modules. */
1472 if (cookies != NULL && ncookies != NULL) {
1473 maxcookies = howmany(node->tn_size,
1474 sizeof(struct tmpfs_dirent)) + 2;
1475 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
1476 M_WAITOK);
1477 *ncookies = 0;
1478 }
1479
1480 if (cookies == NULL)
1481 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL);
1482 else
1483 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies,
1484 ncookies);
1485
1486 /* Buffer was filled without hitting EOF. */
1487 if (error == EJUSTRETURN)
1488 error = (uio->uio_resid != startresid) ? 0 : EINVAL;
1489
1490 if (error != 0 && cookies != NULL && ncookies != NULL) {
1491 free(*cookies, M_TEMP);
1492 *cookies = NULL;
1493 *ncookies = 0;
1494 }
1495
1496 if (eofflag != NULL)
1497 *eofflag =
1498 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1499
1500 return (error);
1501 }
1502
1503 static int
tmpfs_readlink(struct vop_readlink_args * v)1504 tmpfs_readlink(struct vop_readlink_args *v)
1505 {
1506 struct vnode *vp = v->a_vp;
1507 struct uio *uio = v->a_uio;
1508
1509 int error;
1510 struct tmpfs_node *node;
1511
1512 MPASS(uio->uio_offset == 0);
1513 MPASS(vp->v_type == VLNK);
1514
1515 node = VP_TO_TMPFS_NODE(vp);
1516
1517 error = uiomove(node->tn_link_target, MIN(node->tn_size, uio->uio_resid),
1518 uio);
1519 tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node);
1520
1521 return (error);
1522 }
1523
1524 /*
1525 * VOP_FPLOOKUP_SYMLINK routines are subject to special circumstances, see
1526 * the comment above cache_fplookup for details.
1527 *
1528 * Check tmpfs_alloc_node for tmpfs-specific synchronisation notes.
1529 */
1530 static int
tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args * v)1531 tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args *v)
1532 {
1533 struct vnode *vp;
1534 struct tmpfs_node *node;
1535 char *symlink;
1536
1537 vp = v->a_vp;
1538 node = VP_TO_TMPFS_NODE_SMR(vp);
1539 if (__predict_false(node == NULL))
1540 return (EAGAIN);
1541 if (!atomic_load_char(&node->tn_link_smr))
1542 return (EAGAIN);
1543 symlink = atomic_load_ptr(&node->tn_link_target);
1544 if (symlink == NULL)
1545 return (EAGAIN);
1546
1547 return (cache_symlink_resolve(v->a_fpl, symlink, node->tn_size));
1548 }
1549
1550 static int
tmpfs_inactive(struct vop_inactive_args * v)1551 tmpfs_inactive(struct vop_inactive_args *v)
1552 {
1553 struct vnode *vp;
1554 struct tmpfs_node *node;
1555
1556 vp = v->a_vp;
1557 node = VP_TO_TMPFS_NODE(vp);
1558 if (node->tn_links == 0)
1559 vrecycle(vp);
1560 else
1561 tmpfs_check_mtime(vp);
1562 return (0);
1563 }
1564
1565 static int
tmpfs_need_inactive(struct vop_need_inactive_args * ap)1566 tmpfs_need_inactive(struct vop_need_inactive_args *ap)
1567 {
1568 struct vnode *vp;
1569 struct tmpfs_node *node;
1570 struct vm_object *obj;
1571
1572 vp = ap->a_vp;
1573 node = VP_TO_TMPFS_NODE(vp);
1574 if (node->tn_links == 0)
1575 goto need;
1576 if (vp->v_type == VREG) {
1577 obj = vp->v_object;
1578 if (obj->generation != obj->cleangeneration)
1579 goto need;
1580 }
1581 return (0);
1582 need:
1583 return (1);
1584 }
1585
1586 int
tmpfs_reclaim(struct vop_reclaim_args * v)1587 tmpfs_reclaim(struct vop_reclaim_args *v)
1588 {
1589 struct vnode *vp;
1590 struct tmpfs_mount *tmp;
1591 struct tmpfs_node *node;
1592 bool unlock;
1593
1594 vp = v->a_vp;
1595 node = VP_TO_TMPFS_NODE(vp);
1596 tmp = VFS_TO_TMPFS(vp->v_mount);
1597
1598 if (vp->v_type == VREG)
1599 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
1600 vp->v_object = NULL;
1601
1602 TMPFS_LOCK(tmp);
1603 TMPFS_NODE_LOCK(node);
1604 tmpfs_free_vp(vp);
1605
1606 /*
1607 * If the node referenced by this vnode was deleted by the user,
1608 * we must free its associated data structures (now that the vnode
1609 * is being reclaimed).
1610 */
1611 unlock = true;
1612 if (node->tn_links == 0 &&
1613 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1614 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1615 unlock = !tmpfs_free_node_locked(tmp, node, true);
1616 }
1617
1618 if (unlock) {
1619 TMPFS_NODE_UNLOCK(node);
1620 TMPFS_UNLOCK(tmp);
1621 }
1622
1623 MPASS(vp->v_data == NULL);
1624 return (0);
1625 }
1626
1627 int
tmpfs_print(struct vop_print_args * v)1628 tmpfs_print(struct vop_print_args *v)
1629 {
1630 struct vnode *vp = v->a_vp;
1631
1632 struct tmpfs_node *node;
1633
1634 node = VP_TO_TMPFS_NODE(vp);
1635
1636 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n",
1637 node, node->tn_flags, (uintmax_t)node->tn_links);
1638 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
1639 node->tn_mode, node->tn_uid, node->tn_gid,
1640 (intmax_t)node->tn_size, node->tn_status);
1641
1642 if (vp->v_type == VFIFO)
1643 fifo_printinfo(vp);
1644
1645 printf("\n");
1646
1647 return (0);
1648 }
1649
1650 int
tmpfs_pathconf(struct vop_pathconf_args * v)1651 tmpfs_pathconf(struct vop_pathconf_args *v)
1652 {
1653 struct vnode *vp = v->a_vp;
1654 int name = v->a_name;
1655 long *retval = v->a_retval;
1656
1657 int error;
1658
1659 error = 0;
1660
1661 switch (name) {
1662 case _PC_LINK_MAX:
1663 *retval = TMPFS_LINK_MAX;
1664 break;
1665
1666 case _PC_SYMLINK_MAX:
1667 *retval = MAXPATHLEN;
1668 break;
1669
1670 case _PC_NAME_MAX:
1671 *retval = NAME_MAX;
1672 break;
1673
1674 case _PC_PIPE_BUF:
1675 if (vp->v_type == VDIR || vp->v_type == VFIFO)
1676 *retval = PIPE_BUF;
1677 else
1678 error = EINVAL;
1679 break;
1680
1681 case _PC_CHOWN_RESTRICTED:
1682 *retval = 1;
1683 break;
1684
1685 case _PC_NO_TRUNC:
1686 *retval = 1;
1687 break;
1688
1689 case _PC_SYNC_IO:
1690 *retval = 1;
1691 break;
1692
1693 case _PC_FILESIZEBITS:
1694 *retval = 64;
1695 break;
1696
1697 case _PC_MIN_HOLE_SIZE:
1698 *retval = PAGE_SIZE;
1699 break;
1700
1701 case _PC_HAS_HIDDENSYSTEM:
1702 *retval = 1;
1703 break;
1704
1705 default:
1706 error = vop_stdpathconf(v);
1707 }
1708
1709 return (error);
1710 }
1711
1712 static int
tmpfs_vptofh(struct vop_vptofh_args * ap)1713 tmpfs_vptofh(struct vop_vptofh_args *ap)
1714 /*
1715 vop_vptofh {
1716 IN struct vnode *a_vp;
1717 IN struct fid *a_fhp;
1718 };
1719 */
1720 {
1721 struct tmpfs_fid_data *const tfd = (struct tmpfs_fid_data *)ap->a_fhp;
1722 struct tmpfs_node *node;
1723 _Static_assert(sizeof(struct tmpfs_fid_data) <= sizeof(struct fid),
1724 "struct tmpfs_fid_data cannot be larger than struct fid");
1725
1726 node = VP_TO_TMPFS_NODE(ap->a_vp);
1727 tfd->tfd_len = sizeof(*tfd);
1728 tfd->tfd_gen = node->tn_gen;
1729 tfd->tfd_id = node->tn_id;
1730
1731 return (0);
1732 }
1733
1734 static int
tmpfs_whiteout(struct vop_whiteout_args * ap)1735 tmpfs_whiteout(struct vop_whiteout_args *ap)
1736 {
1737 struct vnode *dvp = ap->a_dvp;
1738 struct componentname *cnp = ap->a_cnp;
1739 struct tmpfs_dirent *de;
1740
1741 switch (ap->a_flags) {
1742 case LOOKUP:
1743 return (0);
1744 case CREATE:
1745 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
1746 if (de != NULL)
1747 return (de->td_node == NULL ? 0 : EEXIST);
1748 return (tmpfs_dir_whiteout_add(dvp, cnp));
1749 case DELETE:
1750 tmpfs_dir_whiteout_remove(dvp, cnp);
1751 return (0);
1752 default:
1753 panic("tmpfs_whiteout: unknown op");
1754 }
1755 }
1756
1757 static int
tmpfs_vptocnp_dir(struct tmpfs_node * tn,struct tmpfs_node * tnp,struct tmpfs_dirent ** pde)1758 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp,
1759 struct tmpfs_dirent **pde)
1760 {
1761 struct tmpfs_dir_cursor dc;
1762 struct tmpfs_dirent *de;
1763
1764 for (de = tmpfs_dir_first(tnp, &dc); de != NULL;
1765 de = tmpfs_dir_next(tnp, &dc)) {
1766 if (de->td_node == tn) {
1767 *pde = de;
1768 return (0);
1769 }
1770 }
1771 return (ENOENT);
1772 }
1773
1774 static int
tmpfs_vptocnp_fill(struct vnode * vp,struct tmpfs_node * tn,struct tmpfs_node * tnp,char * buf,size_t * buflen,struct vnode ** dvp)1775 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn,
1776 struct tmpfs_node *tnp, char *buf, size_t *buflen, struct vnode **dvp)
1777 {
1778 struct tmpfs_dirent *de;
1779 int error, i;
1780
1781 error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED,
1782 dvp);
1783 if (error != 0)
1784 return (error);
1785 error = tmpfs_vptocnp_dir(tn, tnp, &de);
1786 if (error == 0) {
1787 i = *buflen;
1788 i -= de->td_namelen;
1789 if (i < 0) {
1790 error = ENOMEM;
1791 } else {
1792 bcopy(de->ud.td_name, buf + i, de->td_namelen);
1793 *buflen = i;
1794 }
1795 }
1796 if (error == 0) {
1797 if (vp != *dvp)
1798 VOP_UNLOCK(*dvp);
1799 } else {
1800 if (vp != *dvp)
1801 vput(*dvp);
1802 else
1803 vrele(vp);
1804 }
1805 return (error);
1806 }
1807
1808 static int
tmpfs_vptocnp(struct vop_vptocnp_args * ap)1809 tmpfs_vptocnp(struct vop_vptocnp_args *ap)
1810 {
1811 struct vnode *vp, **dvp;
1812 struct tmpfs_node *tn, *tnp, *tnp1;
1813 struct tmpfs_dirent *de;
1814 struct tmpfs_mount *tm;
1815 char *buf;
1816 size_t *buflen;
1817 int error;
1818
1819 vp = ap->a_vp;
1820 dvp = ap->a_vpp;
1821 buf = ap->a_buf;
1822 buflen = ap->a_buflen;
1823
1824 tm = VFS_TO_TMPFS(vp->v_mount);
1825 tn = VP_TO_TMPFS_NODE(vp);
1826 if (tn->tn_type == VDIR) {
1827 tnp = tn->tn_dir.tn_parent;
1828 if (tnp == NULL)
1829 return (ENOENT);
1830 tmpfs_ref_node(tnp);
1831 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf,
1832 buflen, dvp);
1833 tmpfs_free_node(tm, tnp);
1834 return (error);
1835 }
1836 restart:
1837 TMPFS_LOCK(tm);
1838 restart_locked:
1839 LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) {
1840 if (tnp->tn_type != VDIR)
1841 continue;
1842 TMPFS_NODE_LOCK(tnp);
1843 tmpfs_ref_node(tnp);
1844
1845 /*
1846 * tn_vnode cannot be instantiated while we hold the
1847 * node lock, so the directory cannot be changed while
1848 * we iterate over it. Do this to avoid instantiating
1849 * vnode for directories which cannot point to our
1850 * node.
1851 */
1852 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp,
1853 &de) : 0;
1854
1855 if (error == 0) {
1856 TMPFS_NODE_UNLOCK(tnp);
1857 TMPFS_UNLOCK(tm);
1858 error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen,
1859 dvp);
1860 if (error == 0) {
1861 tmpfs_free_node(tm, tnp);
1862 return (0);
1863 }
1864 if (VN_IS_DOOMED(vp)) {
1865 tmpfs_free_node(tm, tnp);
1866 return (ENOENT);
1867 }
1868 TMPFS_LOCK(tm);
1869 TMPFS_NODE_LOCK(tnp);
1870 }
1871 if (tmpfs_free_node_locked(tm, tnp, false)) {
1872 goto restart;
1873 } else {
1874 KASSERT(tnp->tn_refcount > 0,
1875 ("node %p refcount zero", tnp));
1876 if (tnp->tn_attached) {
1877 tnp1 = LIST_NEXT(tnp, tn_entries);
1878 TMPFS_NODE_UNLOCK(tnp);
1879 } else {
1880 TMPFS_NODE_UNLOCK(tnp);
1881 goto restart_locked;
1882 }
1883 }
1884 }
1885 TMPFS_UNLOCK(tm);
1886 return (ENOENT);
1887 }
1888
1889 void
tmpfs_extattr_free(struct tmpfs_extattr * ea)1890 tmpfs_extattr_free(struct tmpfs_extattr *ea)
1891 {
1892 free(ea->ea_name, M_TMPFSEA);
1893 free(ea->ea_value, M_TMPFSEA);
1894 free(ea, M_TMPFSEA);
1895 }
1896
1897 static bool
tmpfs_extattr_update_mem(struct tmpfs_mount * tmp,ssize_t size)1898 tmpfs_extattr_update_mem(struct tmpfs_mount *tmp, ssize_t size)
1899 {
1900 TMPFS_LOCK(tmp);
1901 if (size > 0 &&
1902 !tmpfs_pages_check_avail(tmp, howmany(size, PAGE_SIZE))) {
1903 TMPFS_UNLOCK(tmp);
1904 return (false);
1905 }
1906 if (tmp->tm_ea_memory_inuse + size > tmp->tm_ea_memory_max) {
1907 TMPFS_UNLOCK(tmp);
1908 return (false);
1909 }
1910 tmp->tm_ea_memory_inuse += size;
1911 TMPFS_UNLOCK(tmp);
1912 return (true);
1913 }
1914
1915 static int
tmpfs_deleteextattr(struct vop_deleteextattr_args * ap)1916 tmpfs_deleteextattr(struct vop_deleteextattr_args *ap)
1917 {
1918 struct vnode *vp = ap->a_vp;
1919 struct tmpfs_mount *tmp;
1920 struct tmpfs_node *node;
1921 struct tmpfs_extattr *ea;
1922 size_t namelen;
1923 ssize_t diff;
1924 int error;
1925
1926 node = VP_TO_TMPFS_NODE(vp);
1927 tmp = VFS_TO_TMPFS(vp->v_mount);
1928 if (VN_ISDEV(ap->a_vp))
1929 return (EOPNOTSUPP);
1930 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1931 ap->a_cred, ap->a_td, VWRITE);
1932 if (error != 0)
1933 return (error);
1934 if (ap->a_name == NULL || ap->a_name[0] == '\0')
1935 return (EINVAL);
1936 namelen = strlen(ap->a_name);
1937 if (namelen > EXTATTR_MAXNAMELEN)
1938 return (EINVAL);
1939
1940 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) {
1941 if (ea->ea_namespace == ap->a_attrnamespace &&
1942 namelen == ea->ea_namelen &&
1943 memcmp(ap->a_name, ea->ea_name, namelen) == 0)
1944 break;
1945 }
1946
1947 if (ea == NULL)
1948 return (ENOATTR);
1949 LIST_REMOVE(ea, ea_extattrs);
1950 diff = -(sizeof(struct tmpfs_extattr) + namelen + ea->ea_size);
1951 tmpfs_extattr_update_mem(tmp, diff);
1952 tmpfs_extattr_free(ea);
1953 return (0);
1954 }
1955
1956 static int
tmpfs_getextattr(struct vop_getextattr_args * ap)1957 tmpfs_getextattr(struct vop_getextattr_args *ap)
1958 {
1959 struct vnode *vp = ap->a_vp;
1960 struct tmpfs_node *node;
1961 struct tmpfs_extattr *ea;
1962 size_t namelen;
1963 int error;
1964
1965 node = VP_TO_TMPFS_NODE(vp);
1966 if (VN_ISDEV(ap->a_vp))
1967 return (EOPNOTSUPP);
1968 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
1969 ap->a_cred, ap->a_td, VREAD);
1970 if (error != 0)
1971 return (error);
1972 if (ap->a_name == NULL || ap->a_name[0] == '\0')
1973 return (EINVAL);
1974 namelen = strlen(ap->a_name);
1975 if (namelen > EXTATTR_MAXNAMELEN)
1976 return (EINVAL);
1977
1978 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) {
1979 if (ea->ea_namespace == ap->a_attrnamespace &&
1980 namelen == ea->ea_namelen &&
1981 memcmp(ap->a_name, ea->ea_name, namelen) == 0)
1982 break;
1983 }
1984
1985 if (ea == NULL)
1986 return (ENOATTR);
1987 if (ap->a_size != NULL)
1988 *ap->a_size = ea->ea_size;
1989 if (ap->a_uio != NULL && ea->ea_size != 0)
1990 error = uiomove(ea->ea_value, ea->ea_size, ap->a_uio);
1991 return (error);
1992 }
1993
1994 static int
tmpfs_listextattr(struct vop_listextattr_args * ap)1995 tmpfs_listextattr(struct vop_listextattr_args *ap)
1996 {
1997 struct vnode *vp = ap->a_vp;
1998 struct tmpfs_node *node;
1999 struct tmpfs_extattr *ea;
2000 int error;
2001
2002 node = VP_TO_TMPFS_NODE(vp);
2003 if (VN_ISDEV(ap->a_vp))
2004 return (EOPNOTSUPP);
2005 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
2006 ap->a_cred, ap->a_td, VREAD);
2007 if (error != 0)
2008 return (error);
2009 if (ap->a_size != NULL)
2010 *ap->a_size = 0;
2011
2012 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) {
2013 if (ea->ea_namespace != ap->a_attrnamespace)
2014 continue;
2015 if (ap->a_size != NULL)
2016 *ap->a_size += ea->ea_namelen + 1;
2017 if (ap->a_uio != NULL) {
2018 error = uiomove(&ea->ea_namelen, 1, ap->a_uio);
2019 if (error != 0)
2020 break;
2021 error = uiomove(ea->ea_name, ea->ea_namelen, ap->a_uio);
2022 if (error != 0)
2023 break;
2024 }
2025 }
2026
2027 return (error);
2028 }
2029
2030 static int
tmpfs_setextattr(struct vop_setextattr_args * ap)2031 tmpfs_setextattr(struct vop_setextattr_args *ap)
2032 {
2033 struct vnode *vp = ap->a_vp;
2034 struct tmpfs_mount *tmp;
2035 struct tmpfs_node *node;
2036 struct tmpfs_extattr *ea;
2037 struct tmpfs_extattr *new_ea;
2038 size_t attr_size;
2039 size_t namelen;
2040 ssize_t diff;
2041 int error;
2042
2043 node = VP_TO_TMPFS_NODE(vp);
2044 tmp = VFS_TO_TMPFS(vp->v_mount);
2045 attr_size = ap->a_uio->uio_resid;
2046 diff = 0;
2047 if (VN_ISDEV(ap->a_vp))
2048 return (EOPNOTSUPP);
2049 error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
2050 ap->a_cred, ap->a_td, VWRITE);
2051 if (error != 0)
2052 return (error);
2053 if (ap->a_name == NULL || ap->a_name[0] == '\0')
2054 return (EINVAL);
2055 namelen = strlen(ap->a_name);
2056 if (namelen > EXTATTR_MAXNAMELEN)
2057 return (EINVAL);
2058
2059 LIST_FOREACH(ea, &node->tn_extattrs, ea_extattrs) {
2060 if (ea->ea_namespace == ap->a_attrnamespace &&
2061 namelen == ea->ea_namelen &&
2062 memcmp(ap->a_name, ea->ea_name, namelen) == 0) {
2063 diff -= sizeof(struct tmpfs_extattr) + ea->ea_namelen +
2064 ea->ea_size;
2065 break;
2066 }
2067 }
2068
2069 diff += sizeof(struct tmpfs_extattr) + namelen + attr_size;
2070 if (!tmpfs_extattr_update_mem(tmp, diff))
2071 return (ENOSPC);
2072 new_ea = malloc(sizeof(struct tmpfs_extattr), M_TMPFSEA, M_WAITOK);
2073 new_ea->ea_namespace = ap->a_attrnamespace;
2074 new_ea->ea_name = malloc(namelen, M_TMPFSEA, M_WAITOK);
2075 new_ea->ea_namelen = namelen;
2076 memcpy(new_ea->ea_name, ap->a_name, namelen);
2077 if (attr_size != 0) {
2078 new_ea->ea_value = malloc(attr_size, M_TMPFSEA, M_WAITOK);
2079 new_ea->ea_size = attr_size;
2080 error = uiomove(new_ea->ea_value, attr_size, ap->a_uio);
2081 } else {
2082 new_ea->ea_value = NULL;
2083 new_ea->ea_size = 0;
2084 }
2085 if (error != 0) {
2086 tmpfs_extattr_update_mem(tmp, -diff);
2087 tmpfs_extattr_free(new_ea);
2088 return (error);
2089 }
2090 if (ea != NULL) {
2091 LIST_REMOVE(ea, ea_extattrs);
2092 tmpfs_extattr_free(ea);
2093 }
2094 LIST_INSERT_HEAD(&node->tn_extattrs, new_ea, ea_extattrs);
2095 return (0);
2096 }
2097
2098 static off_t
tmpfs_seek_data_locked(vm_object_t obj,off_t noff)2099 tmpfs_seek_data_locked(vm_object_t obj, off_t noff)
2100 {
2101 vm_pindex_t p;
2102
2103 p = swap_pager_seek_data(obj, OFF_TO_IDX(noff));
2104 if (p == OBJ_MAX_SIZE)
2105 p = obj->size;
2106 return (p == OFF_TO_IDX(noff) ? noff : IDX_TO_OFF(p));
2107 }
2108
2109 static int
tmpfs_seek_clamp(struct tmpfs_node * tn,off_t * noff,bool seekdata)2110 tmpfs_seek_clamp(struct tmpfs_node *tn, off_t *noff, bool seekdata)
2111 {
2112 if (*noff < tn->tn_size)
2113 return (0);
2114 if (seekdata)
2115 return (ENXIO);
2116 *noff = tn->tn_size;
2117 return (0);
2118 }
2119
2120 static off_t
tmpfs_seek_hole_locked(vm_object_t obj,off_t noff)2121 tmpfs_seek_hole_locked(vm_object_t obj, off_t noff)
2122 {
2123
2124 return (IDX_TO_OFF(swap_pager_seek_hole(obj, OFF_TO_IDX(noff))));
2125 }
2126
2127 static int
tmpfs_seek_datahole(struct vnode * vp,off_t * off,bool seekdata)2128 tmpfs_seek_datahole(struct vnode *vp, off_t *off, bool seekdata)
2129 {
2130 struct tmpfs_node *tn;
2131 vm_object_t obj;
2132 off_t noff;
2133 int error;
2134
2135 if (vp->v_type != VREG)
2136 return (ENOTTY);
2137 tn = VP_TO_TMPFS_NODE(vp);
2138 noff = *off;
2139 if (noff < 0)
2140 return (ENXIO);
2141 error = tmpfs_seek_clamp(tn, &noff, seekdata);
2142 if (error != 0)
2143 return (error);
2144 obj = tn->tn_reg.tn_aobj;
2145
2146 VM_OBJECT_RLOCK(obj);
2147 noff = seekdata ? tmpfs_seek_data_locked(obj, noff) :
2148 tmpfs_seek_hole_locked(obj, noff);
2149 VM_OBJECT_RUNLOCK(obj);
2150
2151 error = tmpfs_seek_clamp(tn, &noff, seekdata);
2152 if (error == 0)
2153 *off = noff;
2154 return (error);
2155 }
2156
2157 static int
tmpfs_ioctl(struct vop_ioctl_args * ap)2158 tmpfs_ioctl(struct vop_ioctl_args *ap)
2159 {
2160 struct vnode *vp = ap->a_vp;
2161 int error = 0;
2162
2163 switch (ap->a_command) {
2164 case FIOSEEKDATA:
2165 case FIOSEEKHOLE:
2166 error = vn_lock(vp, LK_SHARED);
2167 if (error != 0) {
2168 error = EBADF;
2169 break;
2170 }
2171 error = tmpfs_seek_datahole(vp, (off_t *)ap->a_data,
2172 ap->a_command == FIOSEEKDATA);
2173 VOP_UNLOCK(vp);
2174 break;
2175 default:
2176 error = ENOTTY;
2177 break;
2178 }
2179 return (error);
2180 }
2181
2182 /*
2183 * Vnode operations vector used for files stored in a tmpfs file system.
2184 */
2185 struct vop_vector tmpfs_vnodeop_entries = {
2186 .vop_default = &default_vnodeops,
2187 .vop_lookup = vfs_cache_lookup,
2188 .vop_cachedlookup = tmpfs_cached_lookup,
2189 .vop_create = tmpfs_create,
2190 .vop_mknod = tmpfs_mknod,
2191 .vop_open = tmpfs_open,
2192 .vop_close = tmpfs_close,
2193 .vop_fplookup_vexec = tmpfs_fplookup_vexec,
2194 .vop_fplookup_symlink = tmpfs_fplookup_symlink,
2195 .vop_access = tmpfs_access,
2196 .vop_stat = tmpfs_stat,
2197 .vop_getattr = tmpfs_getattr,
2198 .vop_setattr = tmpfs_setattr,
2199 .vop_read = tmpfs_read,
2200 .vop_read_pgcache = tmpfs_read_pgcache,
2201 .vop_write = tmpfs_write,
2202 .vop_deallocate = tmpfs_deallocate,
2203 .vop_fsync = tmpfs_fsync,
2204 .vop_remove = tmpfs_remove,
2205 .vop_link = tmpfs_link,
2206 .vop_rename = tmpfs_rename,
2207 .vop_mkdir = tmpfs_mkdir,
2208 .vop_rmdir = tmpfs_rmdir,
2209 .vop_symlink = tmpfs_symlink,
2210 .vop_readdir = tmpfs_readdir,
2211 .vop_readlink = tmpfs_readlink,
2212 .vop_inactive = tmpfs_inactive,
2213 .vop_need_inactive = tmpfs_need_inactive,
2214 .vop_reclaim = tmpfs_reclaim,
2215 .vop_print = tmpfs_print,
2216 .vop_pathconf = tmpfs_pathconf,
2217 .vop_vptofh = tmpfs_vptofh,
2218 .vop_whiteout = tmpfs_whiteout,
2219 .vop_bmap = VOP_EOPNOTSUPP,
2220 .vop_vptocnp = tmpfs_vptocnp,
2221 .vop_lock1 = vop_lock,
2222 .vop_unlock = vop_unlock,
2223 .vop_islocked = vop_islocked,
2224 .vop_deleteextattr = tmpfs_deleteextattr,
2225 .vop_getextattr = tmpfs_getextattr,
2226 .vop_listextattr = tmpfs_listextattr,
2227 .vop_setextattr = tmpfs_setextattr,
2228 .vop_add_writecount = vop_stdadd_writecount_nomsync,
2229 .vop_ioctl = tmpfs_ioctl,
2230 };
2231 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_entries);
2232
2233 /*
2234 * Same vector for mounts which do not use namecache.
2235 */
2236 struct vop_vector tmpfs_vnodeop_nonc_entries = {
2237 .vop_default = &tmpfs_vnodeop_entries,
2238 .vop_lookup = tmpfs_lookup,
2239 };
2240 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_nonc_entries);
2241