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1 /*
2 * Copyright (c) 2019 Apple Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24 /*-
25 * Portions Copyright (c) 1992, 1993
26 * The Regents of the University of California. All rights reserved.
27 *
28 * This code is derived from software contributed to Berkeley by
29 * John Heidemann of the UCLA Ficus project.
30 *
31 * Redistribution and use in source and binary forms, with or without
32 * modification, are permitted provided that the following conditions
33 * are met:
34 * 1. Redistributions of source code must retain the above copyright
35 * notice, this list of conditions and the following disclaimer.
36 * 2. Redistributions in binary form must reproduce the above copyright
37 * notice, this list of conditions and the following disclaimer in the
38 * documentation and/or other materials provided with the distribution.
39 * 4. Neither the name of the University nor the names of its contributors
40 * may be used to endorse or promote products derived from this software
41 * without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 *
55 * @(#)null_vnops.c 8.6 (Berkeley) 5/27/95
56 *
57 * Ancestors:
58 * @(#)lofs_vnops.c 1.2 (Berkeley) 6/18/92
59 * ...and...
60 * @(#)null_vnodeops.c 1.20 92/07/07 UCLA Ficus project
61 *
62 * $FreeBSD$
63 */
64
65 #include <sys/param.h>
66 #include <sys/systm.h>
67 #include <sys/conf.h>
68 #include <sys/kernel.h>
69 #include <sys/lock.h>
70 #include <sys/malloc.h>
71 #include <sys/mount.h>
72 #include <sys/mount_internal.h>
73 #include <sys/namei.h>
74 #include <sys/sysctl.h>
75 #include <sys/vnode.h>
76 #include <sys/vnode_internal.h>
77 #include <sys/xattr.h>
78 #include <sys/ubc.h>
79 #include <sys/types.h>
80 #include <sys/dirent.h>
81
82 #include "bindfs.h"
83
84 #define BIND_ROOT_INO 2
85
86 vop_t * bindfs_vnodeop_p = NULL;
87
88 static int
89 bindfs_default(__unused struct vnop_generic_args * args)
90 {
91 return ENOTSUP;
92 }
93
94 static int
95 bindfs_getattr(struct vnop_getattr_args * args)
96 {
97 int error;
98 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
99
100 struct vnode * lowervp = BINDVPTOLOWERVP(args->a_vp);
101
102 error = vnode_getwithref(lowervp);
103 if (error == 0) {
104 error = VNOP_GETATTR(lowervp, args->a_vap, args->a_context);
105 vnode_put(lowervp);
106
107 if (error == 0) {
108 if (VATTR_IS_ACTIVE(args->a_vap, va_fsid)) {
109 /* fix up fsid so it doesn't say the underlying fs*/
110 VATTR_RETURN(args->a_vap, va_fsid, vfs_statfs(vnode_mount(args->a_vp))->f_fsid.val[0]);
111 }
112 if (VATTR_IS_ACTIVE(args->a_vap, va_fsid64)) {
113 /* fix up fsid so it doesn't say the underlying fs*/
114 VATTR_RETURN(args->a_vap, va_fsid64, vfs_statfs(vnode_mount(args->a_vp))->f_fsid);
115 }
116 struct vnode * parent = vnode_parent(args->a_vp);
117 if (vnode_isvroot(args->a_vp)) {
118 // We can use the lower answers for most questions about the root vnode but need to fix up a few things
119 if (VATTR_IS_ACTIVE(args->a_vap, va_fileid)) {
120 VATTR_RETURN(args->a_vap, va_fileid, BIND_ROOT_INO);
121 }
122 if (VATTR_IS_ACTIVE(args->a_vap, va_linkid)) {
123 VATTR_RETURN(args->a_vap, va_linkid, BIND_ROOT_INO);
124 }
125 if (VATTR_IS_ACTIVE(args->a_vap, va_parentid)) {
126 // The parent of the root is itself
127 VATTR_RETURN(args->a_vap, va_parentid, BIND_ROOT_INO);
128 }
129 } else if (parent != NULL && vnode_isvroot(parent)) {
130 if (VATTR_IS_ACTIVE(args->a_vap, va_parentid)) {
131 // This vnode's parent is the root.
132 VATTR_RETURN(args->a_vap, va_parentid, BIND_ROOT_INO);
133 }
134 }
135 }
136 }
137
138 return error;
139 }
140
141 static int
142 bindfs_open(struct vnop_open_args * args)
143 {
144 int error;
145 struct vnode *vp, *lvp;
146
147 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
148
149 vp = args->a_vp;
150 lvp = BINDVPTOLOWERVP(vp);
151 error = vnode_getwithref(lvp);
152 if (error == 0) {
153 error = VNOP_OPEN(lvp, args->a_mode, args->a_context);
154 vnode_put(lvp);
155 }
156
157 return error;
158 }
159
160 static int
161 bindfs_close(struct vnop_close_args * args)
162 {
163 int error;
164 struct vnode *vp, *lvp;
165
166 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
167
168 vp = args->a_vp;
169 lvp = BINDVPTOLOWERVP(vp);
170
171 error = vnode_getwithref(lvp);
172 if (error == 0) {
173 error = VNOP_CLOSE(lvp, args->a_fflag, args->a_context);
174 vnode_put(lvp);
175 }
176 return error;
177 }
178
179 /*
180 * We have to carry on the locking protocol on the bind layer vnodes
181 * as we progress through the tree. We also have to enforce read-only
182 * if this layer is mounted read-only.
183 */
184 static int
185 bind_lookup(struct vnop_lookup_args * ap)
186 {
187 struct componentname * cnp = ap->a_cnp;
188 struct vnode * dvp = ap->a_dvp;
189 struct vnode *vp, *ldvp, *lvp;
190 struct mount * mp;
191 struct bind_mount * bind_mp;
192 int error;
193
194 BINDFSDEBUG("%s parent: %p component: %.*s\n", __FUNCTION__, ap->a_dvp, cnp->cn_namelen, cnp->cn_nameptr);
195
196 mp = vnode_mount(dvp);
197 /* rename and delete are not allowed. this is a read only file system */
198 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME || cnp->cn_nameiop == CREATE) {
199 return EROFS;
200 }
201 bind_mp = MOUNTTOBINDMOUNT(mp);
202
203 // . and .. handling
204 if (cnp->cn_nameptr[0] == '.') {
205 if (cnp->cn_namelen == 1) {
206 vp = dvp;
207 } else if (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.') {
208 vp = (vnode_isvroot(dvp)) ? dvp : vnode_parent(dvp);
209 } else {
210 goto notdot;
211 }
212
213 error = vp ? vnode_get(vp) : ENOENT;
214
215 if (error == 0) {
216 *ap->a_vpp = vp;
217 }
218
219 return error;
220 }
221
222 notdot:
223 ldvp = BINDVPTOLOWERVP(dvp);
224 vp = lvp = NULL;
225
226 /*
227 * Hold ldvp. The reference on it, owned by dvp, is lost in
228 * case of dvp reclamation.
229 */
230 error = vnode_getwithref(ldvp);
231 if (error) {
232 return error;
233 }
234
235 error = VNOP_LOOKUP(ldvp, &lvp, cnp, ap->a_context);
236
237 vnode_put(ldvp);
238
239 if ((error == 0 || error == EJUSTRETURN) && lvp != NULL) {
240 if (ldvp == lvp) {
241 vp = dvp;
242 error = vnode_get(vp);
243 } else {
244 error = bind_nodeget(mp, lvp, dvp, &vp, cnp, 0);
245 }
246 if (error == 0) {
247 *ap->a_vpp = vp;
248 }
249 /* if we got lvp, drop the iocount from VNOP_LOOKUP */
250 if (lvp != NULL) {
251 vnode_put(lvp);
252 }
253 }
254
255 return error;
256 }
257
258 /*
259 * Don't think this needs to do anything
260 */
261 static int
262 bind_inactive(__unused struct vnop_inactive_args * ap)
263 {
264 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
265
266 return 0;
267 }
268
269 static int
270 bind_reclaim(struct vnop_reclaim_args * ap)
271 {
272 struct vnode * vp;
273 struct bind_node * xp;
274 struct vnode * lowervp;
275
276 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
277
278 vp = ap->a_vp;
279
280 xp = VTOBIND(vp);
281 lowervp = xp->bind_lowervp;
282
283 vnode_removefsref(vp);
284
285 bind_hashrem(xp);
286 vnode_getwithref(lowervp);
287 vnode_rele(lowervp);
288 vnode_put(lowervp);
289
290 cache_purge(vp);
291 vnode_clearfsnode(vp);
292
293 FREE(xp, M_TEMP);
294
295 return 0;
296 }
297
298 /* Get dirent length padded to 4 byte alignment */
299 #define DIRENT_LEN(namelen) \
300 ((sizeof(struct dirent) + (namelen + 1) - (__DARWIN_MAXNAMLEN + 1) + 3) & ~3)
301
302 /* Get the end of this dirent */
303 #define DIRENT_END(dep) \
304 (((char *)(dep)) + (dep)->d_reclen - 1)
305
306 static int
307 bindfs_readdir(struct vnop_readdir_args * ap)
308 {
309 struct vnode *vp, *lvp, *dvp;
310 int error;
311 uio_t uio = ap->a_uio;
312
313 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
314 /* assumption is that any vp that comes through here had to go through lookup
315 */
316
317 if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF)) {
318 return EINVAL;
319 }
320
321 vp = ap->a_vp;
322 dvp = vnode_parent(vp);
323 lvp = BINDVPTOLOWERVP(vp);
324 error = vnode_getwithref(lvp);
325 if (error != 0) {
326 goto lb_end;
327 }
328
329 if (vnode_isvroot(vp) || (dvp != NULL && vnode_isvroot(dvp))) {
330 size_t bufsize;
331 void * bufptr;
332 uio_t auio;
333 struct dirent *dep;
334 size_t bytesread;
335 bufsize = 3 * MIN((user_size_t)uio_resid(uio), 87371u) / 8;
336 bufptr = kheap_alloc(KHEAP_TEMP, bufsize, Z_WAITOK);
337 if (bufptr == NULL) {
338 return ENOMEM;
339 }
340 auio = uio_create(1, 0, UIO_SYSSPACE, UIO_READ);
341 uio_addiov(auio, (uintptr_t)bufptr, bufsize);
342 uio_setoffset(auio, uio_offset(uio));
343 error = VNOP_READDIR(lvp, auio, ap->a_flags, ap->a_eofflag, ap->a_numdirent, ap->a_context);
344 vnode_put(lvp);
345 if (error != 0) {
346 goto lb_end;
347 }
348
349 dep = (struct dirent *)bufptr;
350 bytesread = bufsize - uio_resid(auio);
351 while (error == 0 && (char *)dep < ((char *)bufptr + bytesread)) {
352 if (DIRENT_END(dep) > ((char *)bufptr + bytesread) ||
353 DIRENT_LEN(dep->d_namlen) > dep->d_reclen) {
354 printf("%s: %s: Bad dirent received from directory %s\n", __func__,
355 vfs_statfs(vnode_mount(vp))->f_mntonname,
356 vp->v_name ? vp->v_name : "<unknown>");
357 error = EIO;
358 break;
359 }
360 if (dep->d_name[0] == '.') {
361 /* re-write the inode number for the mount root */
362 /* if vp is the mount root then . = 2 and .. = 2 */
363 /* if the parent of vp is the mount root then .. = 2 */
364 if ((vnode_isvroot(vp) && dep->d_namlen == 1) ||
365 (dep->d_namlen == 2 && dep->d_name[1] == '.')) {
366 dep->d_ino = BIND_ROOT_INO;
367 }
368 }
369 /* Copy entry64 to user's buffer. */
370 error = uiomove((caddr_t)dep, dep->d_reclen, uio);
371 /* Move to next entry. */
372 dep = (struct dirent *)((char *)dep + dep->d_reclen);
373 }
374 /* Update the real offset using the offset we got from VNOP_READDIR. */
375 if (error == 0) {
376 uio_setoffset(uio, uio_offset(auio));
377 }
378 uio_free(auio);
379 kheap_free(KHEAP_TEMP, bufptr, bufsize);
380 } else {
381 error = VNOP_READDIR(lvp, ap->a_uio, ap->a_flags, ap->a_eofflag, ap->a_numdirent, ap->a_context);
382 vnode_put(lvp);
383 }
384
385 lb_end:
386 return error;
387 }
388
389 static int
390 bindfs_readlink(struct vnop_readlink_args * ap)
391 {
392 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
393 int error;
394 struct vnode *vp, *lvp;
395
396 vp = ap->a_vp;
397 lvp = BINDVPTOLOWERVP(vp);
398
399 error = vnode_getwithref(lvp);
400 if (error == 0) {
401 error = VNOP_READLINK(lvp, ap->a_uio, ap->a_context);
402 vnode_put(lvp);
403
404 if (error) {
405 printf("bindfs: readlink failed: %d\n", error);
406 }
407 }
408
409 return error;
410 }
411
412 static int
413 bindfs_pathconf(__unused struct vnop_pathconf_args * args)
414 {
415 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
416 return EINVAL;
417 }
418
419 static int
420 bindfs_fsync(__unused struct vnop_fsync_args * args)
421 {
422 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
423 return 0;
424 }
425
426 static int
427 bindfs_mmap(struct vnop_mmap_args * args)
428 {
429 int error;
430 struct vnode *vp, *lvp;
431
432 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
433
434 vp = args->a_vp;
435 lvp = BINDVPTOLOWERVP(vp);
436 error = vnode_getwithref(lvp);
437 if (error == 0) {
438 error = VNOP_MMAP(lvp, args->a_fflags, args->a_context);
439 vnode_put(lvp);
440 }
441
442 return error;
443 }
444
445 static int
446 bindfs_mnomap(struct vnop_mnomap_args * args)
447 {
448 int error;
449 struct vnode *vp, *lvp;
450
451 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
452
453 vp = args->a_vp;
454 lvp = BINDVPTOLOWERVP(vp);
455 error = vnode_getwithref(lvp);
456 if (error == 0) {
457 error = VNOP_MNOMAP(lvp, args->a_context);
458 vnode_put(lvp);
459 }
460
461 return error;
462 }
463
464 static int
465 bindfs_getxattr(struct vnop_getxattr_args * args)
466 {
467 int error;
468 struct vnode *vp, *lvp;
469
470 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
471
472 vp = args->a_vp;
473 lvp = BINDVPTOLOWERVP(vp);
474 error = vnode_getwithref(lvp);
475 if (error == 0) {
476 error = VNOP_GETXATTR(lvp, args->a_name, args->a_uio, args->a_size, args->a_options, args->a_context);
477 vnode_put(lvp);
478 }
479
480 return error;
481 }
482
483 static int
484 bindfs_listxattr(struct vnop_listxattr_args * args)
485 {
486 int error;
487 struct vnode *vp, *lvp;
488
489 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
490
491 vp = args->a_vp;
492 lvp = BINDVPTOLOWERVP(vp);
493 error = vnode_getwithref(lvp);
494 if (error == 0) {
495 error = VNOP_LISTXATTR(lvp, args->a_uio, args->a_size, args->a_options, args->a_context);
496 vnode_put(lvp);
497 }
498
499 return error;
500 }
501
502 /* relies on v1 paging */
503 static int
504 bindfs_pagein(struct vnop_pagein_args * ap)
505 {
506 int error = EIO;
507 struct vnode *vp, *lvp;
508
509 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
510
511 vp = ap->a_vp;
512 lvp = BINDVPTOLOWERVP(vp);
513
514 if (vnode_vtype(vp) != VREG) {
515 return ENOTSUP;
516 }
517
518 /*
519 * Ask VM/UBC/VFS to do our bidding
520 */
521 if (vnode_getwithvid(lvp, BINDVPTOLOWERVID(vp)) == 0) {
522 vm_offset_t ioaddr;
523 uio_t auio;
524 kern_return_t kret;
525 off_t bytes_to_commit;
526 off_t lowersize;
527 upl_t upl = ap->a_pl;
528 user_ssize_t bytes_remaining = 0;
529
530 auio = uio_create(1, ap->a_f_offset, UIO_SYSSPACE, UIO_READ);
531 if (auio == NULL) {
532 error = EIO;
533 goto exit_no_unmap;
534 }
535
536 kret = ubc_upl_map(upl, &ioaddr);
537 if (KERN_SUCCESS != kret) {
538 panic("bindfs_pagein: ubc_upl_map() failed with (%d)", kret);
539 }
540
541 ioaddr += ap->a_pl_offset;
542
543 error = uio_addiov(auio, (user_addr_t)ioaddr, ap->a_size);
544 if (error) {
545 goto exit;
546 }
547
548 lowersize = ubc_getsize(lvp);
549 if (lowersize != ubc_getsize(vp)) {
550 (void)ubc_setsize(vp, lowersize); /* ignore failures, nothing can be done */
551 }
552
553 error = VNOP_READ(lvp, auio, ((ap->a_flags & UPL_IOSYNC) ? IO_SYNC : 0), ap->a_context);
554
555 bytes_remaining = uio_resid(auio);
556 if (bytes_remaining > 0 && bytes_remaining <= (user_ssize_t)ap->a_size) {
557 /* zero bytes that weren't read in to the upl */
558 bzero((void*)((uintptr_t)(ioaddr + ap->a_size - bytes_remaining)), (size_t) bytes_remaining);
559 }
560
561 exit:
562 kret = ubc_upl_unmap(upl);
563 if (KERN_SUCCESS != kret) {
564 panic("bindfs_pagein: ubc_upl_unmap() failed with (%d)", kret);
565 }
566
567 if (auio != NULL) {
568 uio_free(auio);
569 }
570
571 exit_no_unmap:
572 if ((ap->a_flags & UPL_NOCOMMIT) == 0) {
573 if (!error && (bytes_remaining >= 0) && (bytes_remaining <= (user_ssize_t)ap->a_size)) {
574 /* only commit what was read in (page aligned)*/
575 bytes_to_commit = ap->a_size - bytes_remaining;
576 if (bytes_to_commit) {
577 /* need to make sure bytes_to_commit and byte_remaining are page aligned before calling ubc_upl_commit_range*/
578 if (bytes_to_commit & PAGE_MASK) {
579 bytes_to_commit = (bytes_to_commit & (~PAGE_MASK)) + (PAGE_MASK + 1);
580 assert(bytes_to_commit <= (off_t)ap->a_size);
581
582 bytes_remaining = ap->a_size - bytes_to_commit;
583 }
584 ubc_upl_commit_range(upl, ap->a_pl_offset, (upl_size_t)bytes_to_commit, UPL_COMMIT_FREE_ON_EMPTY);
585 }
586
587 /* abort anything thats left */
588 if (bytes_remaining) {
589 ubc_upl_abort_range(upl, ap->a_pl_offset + (upl_offset_t)bytes_to_commit, (upl_size_t)bytes_remaining, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
590 }
591 } else {
592 ubc_upl_abort_range(upl, ap->a_pl_offset, (upl_size_t)ap->a_size, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
593 }
594 }
595 vnode_put(lvp);
596 } else if ((ap->a_flags & UPL_NOCOMMIT) == 0) {
597 ubc_upl_abort_range(ap->a_pl, ap->a_pl_offset, (upl_size_t)ap->a_size, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
598 }
599 return error;
600 }
601
602 static int
603 bindfs_read(struct vnop_read_args * ap)
604 {
605 int error = EIO;
606
607 struct vnode *vp, *lvp;
608
609 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
610
611 vp = ap->a_vp;
612 lvp = BINDVPTOLOWERVP(vp);
613
614 /*
615 * First some house keeping
616 */
617 if (vnode_getwithvid(lvp, BINDVPTOLOWERVID(vp)) == 0) {
618 if (!vnode_isreg(lvp) && !vnode_islnk(lvp)) {
619 error = EPERM;
620 goto end;
621 }
622
623 if (uio_resid(ap->a_uio) == 0) {
624 error = 0;
625 goto end;
626 }
627
628 /*
629 * Now ask VM/UBC/VFS to do our bidding
630 */
631
632 error = VNOP_READ(lvp, ap->a_uio, ap->a_ioflag, ap->a_context);
633 if (error) {
634 printf("bindfs: VNOP_READ failed: %d\n", error);
635 }
636 end:
637 vnode_put(lvp);
638 }
639 return error;
640 }
641
642 /*
643 * Global vfs data structures
644 */
645
646 static const struct vnodeopv_entry_desc bindfs_vnodeop_entries[] = {
647 {.opve_op = &vnop_default_desc, .opve_impl = (vop_t)bindfs_default}, /* default */
648 {.opve_op = &vnop_getattr_desc, .opve_impl = (vop_t)bindfs_getattr}, /* getattr */
649 {.opve_op = &vnop_open_desc, .opve_impl = (vop_t)bindfs_open}, /* open */
650 {.opve_op = &vnop_close_desc, .opve_impl = (vop_t)bindfs_close}, /* close */
651 {.opve_op = &vnop_inactive_desc, .opve_impl = (vop_t)bind_inactive}, /* inactive */
652 {.opve_op = &vnop_reclaim_desc, .opve_impl = (vop_t)bind_reclaim}, /* reclaim */
653 {.opve_op = &vnop_lookup_desc, .opve_impl = (vop_t)bind_lookup}, /* lookup */
654 {.opve_op = &vnop_readdir_desc, .opve_impl = (vop_t)bindfs_readdir}, /* readdir */
655 {.opve_op = &vnop_readlink_desc, .opve_impl = (vop_t)bindfs_readlink}, /* readlink */
656 {.opve_op = &vnop_pathconf_desc, .opve_impl = (vop_t)bindfs_pathconf}, /* pathconf */
657 {.opve_op = &vnop_fsync_desc, .opve_impl = (vop_t)bindfs_fsync}, /* fsync */
658 {.opve_op = &vnop_mmap_desc, .opve_impl = (vop_t)bindfs_mmap}, /* mmap */
659 {.opve_op = &vnop_mnomap_desc, .opve_impl = (vop_t)bindfs_mnomap}, /* mnomap */
660 {.opve_op = &vnop_getxattr_desc, .opve_impl = (vop_t)bindfs_getxattr}, /* getxattr */
661 {.opve_op = &vnop_pagein_desc, .opve_impl = (vop_t)bindfs_pagein}, /* pagein */
662 {.opve_op = &vnop_read_desc, .opve_impl = (vop_t)bindfs_read}, /* read */
663 {.opve_op = &vnop_listxattr_desc, .opve_impl = (vop_t)bindfs_listxattr}, /* listxattr */
664 {.opve_op = NULL, .opve_impl = NULL},
665 };
666
667 const struct vnodeopv_desc bindfs_vnodeop_opv_desc = {.opv_desc_vector_p = &bindfs_vnodeop_p, .opv_desc_ops = bindfs_vnodeop_entries};
668
669 //BINDFS Specific helper function
670
671 int
672 bindfs_getbackingvnode(vnode_t in_vp, vnode_t* out_vpp)
673 {
674 int result = EINVAL;
675
676 if (out_vpp == NULL || in_vp == NULL) {
677 goto end;
678 }
679
680 struct vfsstatfs * sp = NULL;
681 mount_t mp = vnode_mount(in_vp);
682
683 sp = vfs_statfs(mp);
684 //If this isn't a bindfs vnode or it is but it's a special vnode
685 if (strcmp(sp->f_fstypename, "bindfs") != 0) {
686 *out_vpp = NULLVP;
687 result = ENOENT;
688 goto end;
689 }
690
691 vnode_t lvp = BINDVPTOLOWERVP(in_vp);
692 if ((result = vnode_getwithvid(lvp, BINDVPTOLOWERVID(in_vp)))) {
693 goto end;
694 }
695
696 *out_vpp = lvp;
697
698 end:
699 return result;
700 }
mirror of XNU