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
bindfs_default(__unused struct vnop_generic_args * args)89 bindfs_default(__unused struct vnop_generic_args * args)
90 {
91 return ENOTSUP;
92 }
93
94 static int
bindfs_getattr(struct vnop_getattr_args * args)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
bindfs_open(struct vnop_open_args * args)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
bindfs_close(struct vnop_close_args * args)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
bind_lookup(struct vnop_lookup_args * ap)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
bind_inactive(__unused struct vnop_inactive_args * ap)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
bind_reclaim(struct vnop_reclaim_args * ap)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_rele(lowervp);
287
288 cache_purge(vp);
289 vnode_clearfsnode(vp);
290
291 kfree_type(struct bind_node, xp);
292
293 return 0;
294 }
295
296 /* Get dirent length padded to 4 byte alignment */
297 #define DIRENT_LEN(namelen) \
298 ((sizeof(struct dirent) + (namelen + 1) - (__DARWIN_MAXNAMLEN + 1) + 3) & ~3)
299
300 /* Get the end of this dirent */
301 #define DIRENT_END(dep) \
302 (((char *)(dep)) + (dep)->d_reclen - 1)
303
304 static int
bindfs_readdir(struct vnop_readdir_args * ap)305 bindfs_readdir(struct vnop_readdir_args * ap)
306 {
307 struct vnode *vp, *lvp, *dvp;
308 int error;
309 uio_t uio = ap->a_uio;
310
311 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
312 /* assumption is that any vp that comes through here had to go through lookup
313 */
314
315 if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF)) {
316 return EINVAL;
317 }
318
319 vp = ap->a_vp;
320 dvp = vnode_parent(vp);
321 lvp = BINDVPTOLOWERVP(vp);
322 error = vnode_getwithref(lvp);
323 if (error != 0) {
324 goto lb_end;
325 }
326
327 if (vnode_isvroot(vp) || (dvp != NULL && vnode_isvroot(dvp))) {
328 size_t bufsize;
329 void * bufptr;
330 uio_t auio;
331 struct dirent *dep;
332 size_t bytesread;
333 bufsize = 3 * MIN((user_size_t)uio_resid(uio), 87371u) / 8;
334 bufptr = kalloc_data(bufsize, Z_WAITOK);
335 if (bufptr == NULL) {
336 vnode_put(lvp);
337 return ENOMEM;
338 }
339 auio = uio_create(1, 0, UIO_SYSSPACE, UIO_READ);
340 uio_addiov(auio, (uintptr_t)bufptr, bufsize);
341 uio_setoffset(auio, uio_offset(uio));
342 error = VNOP_READDIR(lvp, auio, ap->a_flags, ap->a_eofflag, ap->a_numdirent, ap->a_context);
343 vnode_put(lvp);
344 if (error != 0) {
345 goto lb_end;
346 }
347
348 dep = (struct dirent *)bufptr;
349 bytesread = bufsize - uio_resid(auio);
350 while (error == 0 && (char *)dep < ((char *)bufptr + bytesread)) {
351 if (DIRENT_END(dep) > ((char *)bufptr + bytesread) ||
352 DIRENT_LEN(dep->d_namlen) > dep->d_reclen) {
353 printf("%s: %s: Bad dirent received from directory %s\n", __func__,
354 vfs_statfs(vnode_mount(vp))->f_mntonname,
355 vp->v_name ? vp->v_name : "<unknown>");
356 error = EIO;
357 break;
358 }
359 if (dep->d_name[0] == '.') {
360 /* re-write the inode number for the mount root */
361 /* if vp is the mount root then . = 2 and .. = 2 */
362 /* if the parent of vp is the mount root then .. = 2 */
363 if ((vnode_isvroot(vp) && dep->d_namlen == 1) ||
364 (dep->d_namlen == 2 && dep->d_name[1] == '.')) {
365 dep->d_ino = BIND_ROOT_INO;
366 }
367 }
368 /* Copy entry64 to user's buffer. */
369 error = uiomove((caddr_t)dep, dep->d_reclen, uio);
370 /* Move to next entry. */
371 dep = (struct dirent *)((char *)dep + dep->d_reclen);
372 }
373 /* Update the real offset using the offset we got from VNOP_READDIR. */
374 if (error == 0) {
375 uio_setoffset(uio, uio_offset(auio));
376 }
377 uio_free(auio);
378 kfree_data(bufptr, bufsize);
379 } else {
380 error = VNOP_READDIR(lvp, ap->a_uio, ap->a_flags, ap->a_eofflag, ap->a_numdirent, ap->a_context);
381 vnode_put(lvp);
382 }
383
384 lb_end:
385 return error;
386 }
387
388 static int
bindfs_readlink(struct vnop_readlink_args * ap)389 bindfs_readlink(struct vnop_readlink_args * ap)
390 {
391 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
392 int error;
393 struct vnode *vp, *lvp;
394
395 vp = ap->a_vp;
396 lvp = BINDVPTOLOWERVP(vp);
397
398 error = vnode_getwithref(lvp);
399 if (error == 0) {
400 error = VNOP_READLINK(lvp, ap->a_uio, ap->a_context);
401 vnode_put(lvp);
402
403 if (error) {
404 printf("bindfs: readlink failed: %d\n", error);
405 }
406 }
407
408 return error;
409 }
410
411 static int
bindfs_pathconf(__unused struct vnop_pathconf_args * args)412 bindfs_pathconf(__unused struct vnop_pathconf_args * args)
413 {
414 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
415 return EINVAL;
416 }
417
418 static int
bindfs_fsync(__unused struct vnop_fsync_args * args)419 bindfs_fsync(__unused struct vnop_fsync_args * args)
420 {
421 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
422 return 0;
423 }
424
425 static int
bindfs_mmap(struct vnop_mmap_args * args)426 bindfs_mmap(struct vnop_mmap_args * args)
427 {
428 int error;
429 struct vnode *vp, *lvp;
430
431 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
432
433 vp = args->a_vp;
434 lvp = BINDVPTOLOWERVP(vp);
435 error = vnode_getwithref(lvp);
436 if (error == 0) {
437 error = VNOP_MMAP(lvp, args->a_fflags, args->a_context);
438 vnode_put(lvp);
439 }
440
441 return error;
442 }
443
444 static int
bindfs_mnomap(struct vnop_mnomap_args * args)445 bindfs_mnomap(struct vnop_mnomap_args * args)
446 {
447 int error;
448 struct vnode *vp, *lvp;
449
450 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
451
452 vp = args->a_vp;
453 lvp = BINDVPTOLOWERVP(vp);
454 error = vnode_getwithref(lvp);
455 if (error == 0) {
456 error = VNOP_MNOMAP(lvp, args->a_context);
457 vnode_put(lvp);
458 }
459
460 return error;
461 }
462
463 static int
bindfs_getxattr(struct vnop_getxattr_args * args)464 bindfs_getxattr(struct vnop_getxattr_args * args)
465 {
466 int error;
467 struct vnode *vp, *lvp;
468
469 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
470
471 vp = args->a_vp;
472 lvp = BINDVPTOLOWERVP(vp);
473 error = vnode_getwithref(lvp);
474 if (error == 0) {
475 error = VNOP_GETXATTR(lvp, args->a_name, args->a_uio, args->a_size, args->a_options, args->a_context);
476 vnode_put(lvp);
477 }
478
479 return error;
480 }
481
482 static int
bindfs_listxattr(struct vnop_listxattr_args * args)483 bindfs_listxattr(struct vnop_listxattr_args * args)
484 {
485 int error;
486 struct vnode *vp, *lvp;
487
488 BINDFSDEBUG("%s %p\n", __FUNCTION__, args->a_vp);
489
490 vp = args->a_vp;
491 lvp = BINDVPTOLOWERVP(vp);
492 error = vnode_getwithref(lvp);
493 if (error == 0) {
494 error = VNOP_LISTXATTR(lvp, args->a_uio, args->a_size, args->a_options, args->a_context);
495 vnode_put(lvp);
496 }
497
498 return error;
499 }
500
501 /* relies on v1 paging */
502 static int
bindfs_pagein(struct vnop_pagein_args * ap)503 bindfs_pagein(struct vnop_pagein_args * ap)
504 {
505 int error = EIO;
506 struct vnode *vp, *lvp;
507
508 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
509
510 vp = ap->a_vp;
511 lvp = BINDVPTOLOWERVP(vp);
512
513 if (vnode_vtype(vp) != VREG) {
514 return ENOTSUP;
515 }
516
517 /*
518 * Ask VM/UBC/VFS to do our bidding
519 */
520 if (vnode_getwithvid(lvp, BINDVPTOLOWERVID(vp)) == 0) {
521 vm_offset_t ioaddr;
522 uio_t auio;
523 kern_return_t kret;
524 off_t bytes_to_commit;
525 off_t lowersize;
526 upl_t upl = ap->a_pl;
527 user_ssize_t bytes_remaining = 0;
528
529 auio = uio_create(1, ap->a_f_offset, UIO_SYSSPACE, UIO_READ);
530 if (auio == NULL) {
531 error = EIO;
532 goto exit_no_unmap;
533 }
534
535 kret = ubc_upl_map(upl, &ioaddr);
536 if (KERN_SUCCESS != kret) {
537 panic("bindfs_pagein: ubc_upl_map() failed with (%d)", kret);
538 }
539
540 ioaddr += ap->a_pl_offset;
541
542 error = uio_addiov(auio, (user_addr_t)ioaddr, ap->a_size);
543 if (error) {
544 goto exit;
545 }
546
547 lowersize = ubc_getsize(lvp);
548 if (lowersize != ubc_getsize(vp)) {
549 (void)ubc_setsize(vp, lowersize); /* ignore failures, nothing can be done */
550 }
551
552 error = VNOP_READ(lvp, auio, ((ap->a_flags & UPL_IOSYNC) ? IO_SYNC : 0), ap->a_context);
553
554 bytes_remaining = uio_resid(auio);
555 if (bytes_remaining > 0 && bytes_remaining <= (user_ssize_t)ap->a_size) {
556 /* zero bytes that weren't read in to the upl */
557 bzero((void*)((uintptr_t)(ioaddr + ap->a_size - bytes_remaining)), (size_t) bytes_remaining);
558 }
559
560 exit:
561 kret = ubc_upl_unmap(upl);
562 if (KERN_SUCCESS != kret) {
563 panic("bindfs_pagein: ubc_upl_unmap() failed with (%d)", kret);
564 }
565
566 if (auio != NULL) {
567 uio_free(auio);
568 }
569
570 exit_no_unmap:
571 if ((ap->a_flags & UPL_NOCOMMIT) == 0) {
572 if (!error && (bytes_remaining >= 0) && (bytes_remaining <= (user_ssize_t)ap->a_size)) {
573 /* only commit what was read in (page aligned)*/
574 bytes_to_commit = ap->a_size - bytes_remaining;
575 if (bytes_to_commit) {
576 /* need to make sure bytes_to_commit and byte_remaining are page aligned before calling ubc_upl_commit_range*/
577 if (bytes_to_commit & PAGE_MASK) {
578 bytes_to_commit = (bytes_to_commit & (~PAGE_MASK)) + (PAGE_MASK + 1);
579 assert(bytes_to_commit <= (off_t)ap->a_size);
580
581 bytes_remaining = ap->a_size - bytes_to_commit;
582 }
583 ubc_upl_commit_range(upl, ap->a_pl_offset, (upl_size_t)bytes_to_commit, UPL_COMMIT_FREE_ON_EMPTY);
584 }
585
586 /* abort anything thats left */
587 if (bytes_remaining) {
588 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);
589 }
590 } else {
591 ubc_upl_abort_range(upl, ap->a_pl_offset, (upl_size_t)ap->a_size, UPL_ABORT_ERROR | UPL_ABORT_FREE_ON_EMPTY);
592 }
593 }
594 vnode_put(lvp);
595 } else if ((ap->a_flags & UPL_NOCOMMIT) == 0) {
596 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);
597 }
598 return error;
599 }
600
601 static int
bindfs_read(struct vnop_read_args * ap)602 bindfs_read(struct vnop_read_args * ap)
603 {
604 int error = EIO;
605
606 struct vnode *vp, *lvp;
607
608 BINDFSDEBUG("%s %p\n", __FUNCTION__, ap->a_vp);
609
610 vp = ap->a_vp;
611 lvp = BINDVPTOLOWERVP(vp);
612
613 /*
614 * First some house keeping
615 */
616 if (vnode_getwithvid(lvp, BINDVPTOLOWERVID(vp)) == 0) {
617 if (!vnode_isreg(lvp) && !vnode_islnk(lvp)) {
618 error = EPERM;
619 goto end;
620 }
621
622 if (uio_resid(ap->a_uio) == 0) {
623 error = 0;
624 goto end;
625 }
626
627 /*
628 * Now ask VM/UBC/VFS to do our bidding
629 */
630
631 error = VNOP_READ(lvp, ap->a_uio, ap->a_ioflag, ap->a_context);
632 if (error) {
633 printf("bindfs: VNOP_READ failed: %d\n", error);
634 }
635 end:
636 vnode_put(lvp);
637 }
638 return error;
639 }
640
641 /*
642 * Global vfs data structures
643 */
644
645 static const struct vnodeopv_entry_desc bindfs_vnodeop_entries[] = {
646 {.opve_op = &vnop_default_desc, .opve_impl = (vop_t)bindfs_default}, /* default */
647 {.opve_op = &vnop_getattr_desc, .opve_impl = (vop_t)bindfs_getattr}, /* getattr */
648 {.opve_op = &vnop_open_desc, .opve_impl = (vop_t)bindfs_open}, /* open */
649 {.opve_op = &vnop_close_desc, .opve_impl = (vop_t)bindfs_close}, /* close */
650 {.opve_op = &vnop_inactive_desc, .opve_impl = (vop_t)bind_inactive}, /* inactive */
651 {.opve_op = &vnop_reclaim_desc, .opve_impl = (vop_t)bind_reclaim}, /* reclaim */
652 {.opve_op = &vnop_lookup_desc, .opve_impl = (vop_t)bind_lookup}, /* lookup */
653 {.opve_op = &vnop_readdir_desc, .opve_impl = (vop_t)bindfs_readdir}, /* readdir */
654 {.opve_op = &vnop_readlink_desc, .opve_impl = (vop_t)bindfs_readlink}, /* readlink */
655 {.opve_op = &vnop_pathconf_desc, .opve_impl = (vop_t)bindfs_pathconf}, /* pathconf */
656 {.opve_op = &vnop_fsync_desc, .opve_impl = (vop_t)bindfs_fsync}, /* fsync */
657 {.opve_op = &vnop_mmap_desc, .opve_impl = (vop_t)bindfs_mmap}, /* mmap */
658 {.opve_op = &vnop_mnomap_desc, .opve_impl = (vop_t)bindfs_mnomap}, /* mnomap */
659 {.opve_op = &vnop_getxattr_desc, .opve_impl = (vop_t)bindfs_getxattr}, /* getxattr */
660 {.opve_op = &vnop_pagein_desc, .opve_impl = (vop_t)bindfs_pagein}, /* pagein */
661 {.opve_op = &vnop_read_desc, .opve_impl = (vop_t)bindfs_read}, /* read */
662 {.opve_op = &vnop_listxattr_desc, .opve_impl = (vop_t)bindfs_listxattr}, /* listxattr */
663 {.opve_op = NULL, .opve_impl = NULL},
664 };
665
666 const struct vnodeopv_desc bindfs_vnodeop_opv_desc = {.opv_desc_vector_p = &bindfs_vnodeop_p, .opv_desc_ops = bindfs_vnodeop_entries};
667
668 //BINDFS Specific helper function
669
670 int
bindfs_getbackingvnode(vnode_t in_vp,vnode_t * out_vpp)671 bindfs_getbackingvnode(vnode_t in_vp, vnode_t* out_vpp)
672 {
673 int result = EINVAL;
674
675 if (out_vpp == NULL || in_vp == NULL) {
676 goto end;
677 }
678
679 struct vfsstatfs * sp = NULL;
680 mount_t mp = vnode_mount(in_vp);
681
682 sp = vfs_statfs(mp);
683 //If this isn't a bindfs vnode or it is but it's a special vnode
684 if (strcmp(sp->f_fstypename, "bindfs") != 0) {
685 *out_vpp = NULLVP;
686 result = ENOENT;
687 goto end;
688 }
689
690 vnode_t lvp = BINDVPTOLOWERVP(in_vp);
691 if ((result = vnode_getwithvid(lvp, BINDVPTOLOWERVID(in_vp)))) {
692 goto end;
693 }
694
695 *out_vpp = lvp;
696
697 end:
698 return result;
699 }
700