1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24 /*
25 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
26 */
27
28 /*
29 * vnode ops for the /dev filesystem
30 *
31 * - VDIR, VCHR, CBLK, and VLNK are considered must supported files
32 * - VREG and VDOOR are used for some internal implementations in
33 * the global zone, e.g. devname and devfsadm communication
34 * - other file types are unusual in this namespace and
35 * not supported for now
36 */
37
38 /*
39 * sdev has a few basic goals:
40 * o Provide /dev for the global zone as well as various non-global zones.
41 * o Provide the basic functionality that devfsadm might need (mknod,
42 * symlinks, etc.)
43 * o Allow persistent permissions on files in /dev.
44 * o Allow for dynamic directories and nodes for use by various services (pts,
45 * zvol, net, etc.)
46 *
47 * The sdev file system is primarily made up of sdev_node_t's which is sdev's
48 * counterpart to the vnode_t. There are two different classes of sdev_node_t's
49 * that we generally care about, dynamic and otherwise.
50 *
51 * Persisting Information
52 * ----------------------
53 *
54 * When sdev is mounted, it keeps track of the underlying file system it is
55 * mounted over. In certain situations, sdev will go and create entries in that
56 * underlying file system. These underlying 'back end' nodes are used as proxies
57 * for various changes in permissions. While specific sets of nodes, such as
58 * dynamic ones, are exempt, this process stores permission changes against
59 * these back end nodes. The point of all of this is to allow for these settings
60 * to persist across host and zone reboots. As an example, consider the entry
61 * /dev/dsk/c0t0d0 which is a character device and that / is in UFS. Upon
62 * changing the permissions on c0t0d0 you'd have the following logical
63 * relationships:
64 *
65 * +------------------+ sdev_vnode +--------------+
66 * | sdev_node_t |<---------------->| vnode_t |
67 * | /dev/dsk/c0t0d0 |<---------------->| for sdev |
68 * +------------------+ +--------------+
69 * |
70 * | sdev_attrvp
71 * |
72 * | +---------------------+
73 * +--->| vnode_t for UFS|ZFS |
74 * | /dev/dsk/c0t0d0 |
75 * +---------------------+
76 *
77 * sdev is generally in memory. Therefore when a lookup happens and there is no
78 * entry already inside of a directory cache, it will next check the backing
79 * store. If the backing store exists, we will reconstitute the sdev_node based
80 * on the information that we persisted. When we create the backing store node,
81 * we use the struct vattr information that we already have in sdev_node_t.
82 * Because of this, we already know if the entry was previously a symlink,
83 * directory, or some other kind of type. Note that not all types of nodes are
84 * supported. Currently only VDIR, VCHR, VBLK, VREG, VDOOR, and VLNK are
85 * eligible to be persisted.
86 *
87 * When the sdev_node is created and the lookup is done, we grab a hold on the
88 * underlying vnode as part of the call to VOP_LOOKUP. That reference is held
89 * until the sdev_node becomes inactive. Once its reference count reaches one
90 * and the VOP_INACTIVE callback fires leading to the destruction of the node,
91 * the reference on the underlying vnode will be released.
92 *
93 * The backing store node will be deleted only when the node itself is deleted
94 * through the means of a VOP_REMOVE, VOP_RMDIR, or similar call.
95 *
96 * Not everything can be persisted, see The Rules section for more details.
97 *
98 * Dynamic Nodes
99 * -------------
100 *
101 * Dynamic nodes allow for specific interactions with various kernel subsystems
102 * when looking up directory entries. This allows the lookup and readdir
103 * functions to check against the kernel subsystem's for validity. eg. does a
104 * zvol or nic still exist.
105 *
106 * More specifically, when we create various directories we check if the
107 * directory name matches that of one of the names in the vtab[] (sdev_subr.c).
108 * If it does, we swap out the vnode operations into a new set which combine the
109 * normal sdev vnode operations with the dynamic set here.
110 *
111 * In addition, various dynamic nodes implement a verification entry point. This
112 * verification entry is used as a part of lookup and readdir. The goal for
113 * these dynamic nodes is to allow them to check with the underlying subsystems
114 * to ensure that these devices are still present, or if they have gone away, to
115 * remove them from the results. This is indicated by using the SDEV_VTOR flag
116 * in vtab[].
117 *
118 * Dynamic nodes have additional restrictions placed upon them. They may only
119 * appear at the top level directory of the file system. In addition, users
120 * cannot create dirents below any leve of a dynamic node aside from its special
121 * vnops.
122 *
123 * Profiles
124 * --------
125 *
126 * Profiles exist for the purpose of non-global zones. They work with the zone
127 * brands and zoneadmd to set up a filter of allowed devices that can appear in
128 * a non-global zone's /dev. These are sent to sdev by means of libdevinfo and a
129 * modctl system call. Specifically it allows one to add patterns of device
130 * paths to include and exclude. It allows for a collection of symlinks to be
131 * added and it allows for remapping names.
132 *
133 * When operating in a non-global zone, several of the sdev vnops are redirected
134 * to the profile versions. These impose additional restrictions such as
135 * enforcing that a non-global zone's /dev is read only.
136 *
137 * sdev_node_t States
138 * ------------------
139 *
140 * A given sdev_node_t has a field called the sdev_state which describes where
141 * in the sdev life cycle it is. There are three primary states: SDEV_INIT,
142 * SDEV_READY, and SDEV_ZOMBIE.
143 *
144 * SDEV_INIT: When a new /dev file is first looked up, a sdev_node
145 * is allocated, initialized and added to the directory's
146 * sdev_node cache. A node at this state will also
147 * have the SDEV_LOOKUP flag set.
148 *
149 * Other threads that are trying to look up a node at
150 * this state will be blocked until the SDEV_LOOKUP flag
151 * is cleared.
152 *
153 * When the SDEV_LOOKUP flag is cleared, the node may
154 * transition into the SDEV_READY state for a successful
155 * lookup or the node is removed from the directory cache
156 * and destroyed if the named node can not be found.
157 * An ENOENT error is returned for the second case.
158 *
159 * SDEV_READY: A /dev file has been successfully looked up and
160 * associated with a vnode. The /dev file is available
161 * for the supported /dev file system operations.
162 *
163 * SDEV_ZOMBIE: Deletion of a /dev file has been explicitly issued
164 * to an SDEV_READY node. The node is transitioned into
165 * the SDEV_ZOMBIE state if the vnode reference count
166 * is still held. A SDEV_ZOMBIE node does not support
167 * any of the /dev file system operations. A SDEV_ZOMBIE
168 * node is immediately removed from the directory cache
169 * and destroyed once the reference count reaches zero.
170 *
171 * Historically nodes that were marked SDEV_ZOMBIE were not removed from the
172 * underlying directory caches. This has been the source of numerous bugs and
173 * thus to better mimic what happens on a real file system, it is no longer the
174 * case.
175 *
176 * The following state machine describes the life cycle of a given node and its
177 * associated states:
178 *
179 * node is . . . . .
180 * allocated via . +-------------+ . . . . . . . vnode_t refcount
181 * sdev_nodeinit() . | Unallocated | . reaches zero and
182 * +--------*-----| Memory |<--------*---+ sdev_inactive is
183 * | +-------------+ | called.
184 * | +------------^ | called.
185 * v | |
186 * +-----------+ * . . sdev_nodeready() +-------------+
187 * | SDEV_INIT | | or related setup | SDEV_ZOMBIE |
188 * +-----------+ | failure +-------------+
189 * | | ^
190 * | | +------------+ |
191 * +-*----------->| SDEV_READY |--------*-----+
192 * . +------------+ . The node is no longer
193 * . . node successfully . . . . . valid or we've been
194 * inserted into the asked to remove it.
195 * directory cache This happens via
196 * and sdev_nodready() sdev_dirdelete().
197 * call successful.
198 *
199 * Adding and Removing Dirents, Zombie Nodes
200 * -----------------------------------------
201 *
202 * As part of doing a lookup, readdir, or an explicit creation operation like
203 * mkdir or create, nodes may be created. Every directory has an avl tree which
204 * contains its children, the sdev_entries tree. This is only used if the type
205 * is VDIR. Access to this is controlled by the sdev_node_t's contents_lock and
206 * it is managed through sdev_cache_update().
207 *
208 * Every sdev_node_t has a field sdev_state, which describes the current state
209 * of the node. A node is generally speaking in the SDEV_READY state. When it is
210 * there, it can be looked up, accessed, and operations performed on it. When a
211 * node is going to be removed from the directory cache it is marked as a
212 * zombie. Once a node becomes a zombie, no other file system operations will
213 * succeed and it will continue to exist as a node until the vnode count on the
214 * node reaches zero. At that point, the node will be freed. However, once a
215 * node has been marked as a zombie, it will be removed immediately from the
216 * directory cache such that no one else may find it again. This means that
217 * someone else can insert a new entry into that directory with the same name
218 * and without a problem.
219 *
220 * To remove a node, see the section on that in The Rules.
221 *
222 * The Rules
223 * ---------
224 * These are the rules to live by when working in sdev. These are not
225 * exhaustive.
226 *
227 * - Set 1: Working with Backing Nodes
228 * o If there is a SDEV_READY sdev_node_t, it knows about its backing node.
229 * o If we find a backing node when looking up an sdev_node_t for the first
230 * time, we use its attributes to build our sdev_node_t.
231 * o If there is a found backing node, or we create a backing node, that's
232 * when we grab the hold on its vnode.
233 * o If we mark an sdev_node_t a ZOMBIE, we must remove its backing node from
234 * the underlying file system. It must not be searchable or findable.
235 * o We release our hold on the backing node vnode when we destroy the
236 * sdev_node_t.
237 *
238 * - Set 2: Locking rules for sdev (not exhaustive)
239 * o The majority of nodes contain an sdev_contents rw lock. You must hold it
240 * for read or write if manipulating its contents appropriately.
241 * o You must lock your parent before yourself.
242 * o If you need your vnode's v_lock and the sdev_contents rw lock, you must
243 * grab the v_lock before the sdev_contents rw_lock.
244 * o If you release a lock on the node as a part of upgrading it, you must
245 * verify that the node has not become a zombie as a part of this process.
246 *
247 * - Set 3: Zombie Status and What it Means
248 * o If you encounter a node that is a ZOMBIE, that means that it has been
249 * unlinked from the backing store.
250 * o If you release your contents lock and acquire it again (say as part of
251 * trying to grab a write lock) you must check that the node has not become
252 * a zombie.
253 * o You should VERIFY that a looked up node is not a zombie. This follows
254 * from the following logic. To mark something as a zombie means that it is
255 * removed from the parents directory cache. To do that, you must have a
256 * write lock on the parent's sdev_contents. To lookup through that
257 * directory you must have a read lock. This then becomes a simple ordering
258 * problem. If you've been granted the lock then the other operation cannot
259 * be in progress or must have already succeeded.
260 *
261 * - Set 4: Removing Directory Entries (aka making nodes Zombies)
262 * o Write lock must be held on the directory
263 * o Write lock must be held on the node
264 * o Remove the sdev_node_t from its parent cache
265 * o Remove the corresponding backing store node, if it exists, eg. use
266 * VOP_REMOVE or VOP_RMDIR.
267 * o You must NOT make any change in the vnode reference count! Nodes should
268 * only be cleaned up through VOP_INACTIVE callbacks.
269 * o VOP_INACTIVE is the only one responsible for doing the final vn_rele of
270 * the backing store vnode that was grabbed during lookup.
271 *
272 * - Set 5: What Nodes may be Persisted
273 * o The root, /dev is always persisted
274 * o Any node in vtab which is marked SDEV_DYNAMIC, may not be persisted
275 * unless it is also marked SDEV_PERSIST
276 * o Anything whose parent directory is marked SDEV_PERSIST will pass that
277 * along to the child as long as it does not contradict the above rules
278 */
279
280 #include <sys/types.h>
281 #include <sys/param.h>
282 #include <sys/t_lock.h>
283 #include <sys/systm.h>
284 #include <sys/sysmacros.h>
285 #include <sys/user.h>
286 #include <sys/time.h>
287 #include <sys/vfs.h>
288 #include <sys/vnode.h>
289 #include <sys/vfs_opreg.h>
290 #include <sys/file.h>
291 #include <sys/fcntl.h>
292 #include <sys/flock.h>
293 #include <sys/kmem.h>
294 #include <sys/uio.h>
295 #include <sys/errno.h>
296 #include <sys/stat.h>
297 #include <sys/cred.h>
298 #include <sys/dirent.h>
299 #include <sys/pathname.h>
300 #include <sys/cmn_err.h>
301 #include <sys/debug.h>
302 #include <sys/policy.h>
303 #include <vm/hat.h>
304 #include <vm/seg_vn.h>
305 #include <vm/seg_map.h>
306 #include <vm/seg.h>
307 #include <vm/as.h>
308 #include <vm/page.h>
309 #include <sys/proc.h>
310 #include <sys/mode.h>
311 #include <sys/sunndi.h>
312 #include <sys/ptms.h>
313 #include <fs/fs_subr.h>
314 #include <sys/fs/dv_node.h>
315 #include <sys/fs/sdev_impl.h>
316
317 /*ARGSUSED*/
318 static int
319 sdev_open(struct vnode **vpp, int flag, struct cred *cred, caller_context_t *ct)
320 {
321 struct sdev_node *dv = VTOSDEV(*vpp);
322 struct sdev_node *ddv = dv->sdev_dotdot;
323 int error = 0;
324
325 if ((*vpp)->v_type == VDIR)
326 return (0);
327
328 if (!SDEV_IS_GLOBAL(dv))
329 return (ENOTSUP);
330
331 if ((*vpp)->v_type == VLNK)
332 return (ENOENT);
333 ASSERT((*vpp)->v_type == VREG);
334 if ((*vpp)->v_type != VREG)
335 return (ENOTSUP);
336
337 ASSERT(ddv);
338 rw_enter(&ddv->sdev_contents, RW_READER);
339 if (dv->sdev_attrvp == NULL) {
340 rw_exit(&ddv->sdev_contents);
341 return (ENOENT);
342 }
343 error = VOP_OPEN(&(dv->sdev_attrvp), flag, cred, ct);
344 rw_exit(&ddv->sdev_contents);
345 return (error);
346 }
347
348 /*ARGSUSED1*/
349 static int
350 sdev_close(struct vnode *vp, int flag, int count,
351 offset_t offset, struct cred *cred, caller_context_t *ct)
352 {
353 struct sdev_node *dv = VTOSDEV(vp);
354
355 if (vp->v_type == VDIR) {
356 cleanlocks(vp, ttoproc(curthread)->p_pid, 0);
357 cleanshares(vp, ttoproc(curthread)->p_pid);
358 return (0);
359 }
360
361 if (!SDEV_IS_GLOBAL(dv))
362 return (ENOTSUP);
363
364 ASSERT(vp->v_type == VREG);
365 if (vp->v_type != VREG)
366 return (ENOTSUP);
367
368 ASSERT(dv->sdev_attrvp);
369 return (VOP_CLOSE(dv->sdev_attrvp, flag, count, offset, cred, ct));
370 }
371
372 /*ARGSUSED*/
373 static int
374 sdev_read(struct vnode *vp, struct uio *uio, int ioflag, struct cred *cred,
375 struct caller_context *ct)
376 {
377 struct sdev_node *dv = (struct sdev_node *)VTOSDEV(vp);
378 int error;
379
380 if (!SDEV_IS_GLOBAL(dv))
381 return (EINVAL);
382
383 if (vp->v_type == VDIR)
384 return (EISDIR);
385
386 /* only supporting regular files in /dev */
387 ASSERT(vp->v_type == VREG);
388 if (vp->v_type != VREG)
389 return (EINVAL);
390
391 ASSERT(RW_READ_HELD(&VTOSDEV(vp)->sdev_contents));
392 ASSERT(dv->sdev_attrvp);
393 (void) VOP_RWLOCK(dv->sdev_attrvp, 0, ct);
394 error = VOP_READ(dv->sdev_attrvp, uio, ioflag, cred, ct);
395 VOP_RWUNLOCK(dv->sdev_attrvp, 0, ct);
396 return (error);
397 }
398
399 /*ARGSUSED*/
400 static int
401 sdev_write(struct vnode *vp, struct uio *uio, int ioflag, struct cred *cred,
402 struct caller_context *ct)
403 {
404 struct sdev_node *dv = VTOSDEV(vp);
405 int error = 0;
406
407 if (!SDEV_IS_GLOBAL(dv))
408 return (EINVAL);
409
410 if (vp->v_type == VDIR)
411 return (EISDIR);
412
413 /* only supporting regular files in /dev */
414 ASSERT(vp->v_type == VREG);
415 if (vp->v_type != VREG)
416 return (EINVAL);
417
418 ASSERT(dv->sdev_attrvp);
419
420 (void) VOP_RWLOCK(dv->sdev_attrvp, 1, ct);
421 error = VOP_WRITE(dv->sdev_attrvp, uio, ioflag, cred, ct);
422 VOP_RWUNLOCK(dv->sdev_attrvp, 1, ct);
423 if (error == 0) {
424 sdev_update_timestamps(dv->sdev_attrvp, kcred,
425 AT_MTIME);
426 }
427 return (error);
428 }
429
430 /*ARGSUSED*/
431 static int
432 sdev_ioctl(struct vnode *vp, int cmd, intptr_t arg, int flag,
433 struct cred *cred, int *rvalp, caller_context_t *ct)
434 {
435 struct sdev_node *dv = VTOSDEV(vp);
436
437 if (!SDEV_IS_GLOBAL(dv) || (vp->v_type == VDIR))
438 return (ENOTTY);
439
440 ASSERT(vp->v_type == VREG);
441 if (vp->v_type != VREG)
442 return (EINVAL);
443
444 ASSERT(dv->sdev_attrvp);
445 return (VOP_IOCTL(dv->sdev_attrvp, cmd, arg, flag, cred, rvalp, ct));
446 }
447
448 static int
449 sdev_getattr(struct vnode *vp, struct vattr *vap, int flags,
450 struct cred *cr, caller_context_t *ct)
451 {
452 int error = 0;
453 struct sdev_node *dv = VTOSDEV(vp);
454 struct sdev_node *parent = dv->sdev_dotdot;
455
456 ASSERT(parent);
457
458 rw_enter(&parent->sdev_contents, RW_READER);
459 ASSERT(dv->sdev_attr || dv->sdev_attrvp);
460
461 /*
462 * search order:
463 * - for persistent nodes (SDEV_PERSIST): backstore
464 * - for non-persistent nodes: module ops if global, then memory
465 */
466 if (dv->sdev_attrvp) {
467 rw_exit(&parent->sdev_contents);
468 error = VOP_GETATTR(dv->sdev_attrvp, vap, flags, cr, ct);
469 sdev_vattr_merge(dv, vap);
470 } else {
471 ASSERT(dv->sdev_attr);
472 *vap = *dv->sdev_attr;
473 sdev_vattr_merge(dv, vap);
474 rw_exit(&parent->sdev_contents);
475 }
476
477 return (error);
478 }
479
480 /*ARGSUSED4*/
481 static int
482 sdev_setattr(struct vnode *vp, struct vattr *vap, int flags,
483 struct cred *cred, caller_context_t *ctp)
484 {
485 return (devname_setattr_func(vp, vap, flags, cred, NULL, 0));
486 }
487
488 static int
489 sdev_getsecattr(struct vnode *vp, struct vsecattr *vsap, int flags,
490 struct cred *cr, caller_context_t *ct)
491 {
492 int error;
493 struct sdev_node *dv = VTOSDEV(vp);
494 struct vnode *avp = dv->sdev_attrvp;
495
496 if (avp == NULL) {
497 /* return fs_fab_acl() if flavor matches, else do nothing */
498 if ((SDEV_ACL_FLAVOR(vp) == _ACL_ACLENT_ENABLED &&
499 (vsap->vsa_mask & (VSA_ACLCNT | VSA_DFACLCNT))) ||
500 (SDEV_ACL_FLAVOR(vp) == _ACL_ACE_ENABLED &&
501 (vsap->vsa_mask & (VSA_ACECNT | VSA_ACE))))
502 return (fs_fab_acl(vp, vsap, flags, cr, ct));
503
504 return (ENOSYS);
505 }
506
507 (void) VOP_RWLOCK(avp, 1, ct);
508 error = VOP_GETSECATTR(avp, vsap, flags, cr, ct);
509 VOP_RWUNLOCK(avp, 1, ct);
510 return (error);
511 }
512
513 static int
514 sdev_setsecattr(struct vnode *vp, struct vsecattr *vsap, int flags,
515 struct cred *cr, caller_context_t *ct)
516 {
517 int error;
518 struct sdev_node *dv = VTOSDEV(vp);
519 struct vnode *avp = dv->sdev_attrvp;
520
521 if (dv->sdev_state == SDEV_ZOMBIE)
522 return (0);
523
524 if (avp == NULL) {
525 if (SDEV_IS_GLOBAL(dv) && !SDEV_IS_PERSIST(dv))
526 return (fs_nosys());
527 ASSERT(dv->sdev_attr);
528 /*
529 * if coming in directly, the acl system call will
530 * have held the read-write lock via VOP_RWLOCK()
531 * If coming in via specfs, specfs will have
532 * held the rw lock on the realvp i.e. us.
533 */
534 ASSERT(RW_WRITE_HELD(&dv->sdev_contents));
535 sdev_vattr_merge(dv, dv->sdev_attr);
536 error = sdev_shadow_node(dv, cr);
537 if (error) {
538 return (fs_nosys());
539 }
540
541 ASSERT(dv->sdev_attrvp);
542 /* clean out the memory copy if any */
543 if (dv->sdev_attr) {
544 kmem_free(dv->sdev_attr, sizeof (struct vattr));
545 dv->sdev_attr = NULL;
546 }
547 avp = dv->sdev_attrvp;
548 }
549 ASSERT(avp);
550
551 (void) VOP_RWLOCK(avp, V_WRITELOCK_TRUE, ct);
552 error = VOP_SETSECATTR(avp, vsap, flags, cr, ct);
553 VOP_RWUNLOCK(avp, V_WRITELOCK_TRUE, ct);
554 return (error);
555 }
556
557 /*
558 * There are two different unlocked routines. This one is not static as it is
559 * used as part of the secpolicy_vnode_setattr calls in sdev_subr.c. Because it
560 * is used in that function it has to have a specific signature.
561 */
562 int
563 sdev_unlocked_access(void *vdv, int mode, struct cred *cr)
564 {
565 struct sdev_node *dv = vdv;
566 int shift = 0;
567 uid_t owner = dv->sdev_attr->va_uid;
568
569 if (crgetuid(cr) != owner) {
570 shift += 3;
571 if (groupmember(dv->sdev_attr->va_gid, cr) == 0)
572 shift += 3;
573 }
574
575 return (secpolicy_vnode_access2(cr, SDEVTOV(dv), owner,
576 dv->sdev_attr->va_mode << shift, mode));
577 }
578
579 static int
580 sdev_self_access(sdev_node_t *dv, int mode, int flags, struct cred *cr,
581 caller_context_t *ct)
582 {
583 int ret;
584
585 ASSERT(dv->sdev_attr || dv->sdev_attrvp);
586 if (dv->sdev_attrvp) {
587 ret = VOP_ACCESS(dv->sdev_attrvp, mode, flags, cr, ct);
588 } else if (dv->sdev_attr) {
589 ret = sdev_unlocked_access(dv, mode, cr);
590 if (ret)
591 ret = EACCES;
592 }
593
594 return (ret);
595 }
596
597 static int
598 sdev_access(struct vnode *vp, int mode, int flags, struct cred *cr,
599 caller_context_t *ct)
600 {
601 struct sdev_node *dv = VTOSDEV(vp);
602 int ret;
603
604 rw_enter(&dv->sdev_contents, RW_READER);
605 ret = sdev_self_access(dv, mode, flags, cr, ct);
606 rw_exit(&dv->sdev_contents);
607
608 return (ret);
609 }
610
611 /*
612 * Lookup
613 */
614 /*ARGSUSED3*/
615 static int
616 sdev_lookup(struct vnode *dvp, char *nm, struct vnode **vpp,
617 struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cred,
618 caller_context_t *ct, int *direntflags, pathname_t *realpnp)
619 {
620 struct sdev_node *parent;
621 int error;
622
623 parent = VTOSDEV(dvp);
624 ASSERT(parent);
625
626 /* execute access is required to search the directory */
627 if ((error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct)) != 0)
628 return (error);
629
630 if (!SDEV_IS_GLOBAL(parent))
631 return (prof_lookup(dvp, nm, vpp, cred));
632 return (devname_lookup_func(parent, nm, vpp, cred, NULL, 0));
633 }
634
635 /*ARGSUSED2*/
636 static int
637 sdev_create(struct vnode *dvp, char *nm, struct vattr *vap, vcexcl_t excl,
638 int mode, struct vnode **vpp, struct cred *cred, int flag,
639 caller_context_t *ct, vsecattr_t *vsecp)
640 {
641 struct vnode *vp = NULL;
642 struct vnode *avp;
643 struct sdev_node *parent;
644 struct sdev_node *self = NULL;
645 int error = 0;
646 vtype_t type = vap->va_type;
647
648 ASSERT(type != VNON && type != VBAD);
649
650 if ((type == VFIFO) || (type == VSOCK) ||
651 (type == VPROC) || (type == VPORT))
652 return (ENOTSUP);
653
654 parent = VTOSDEV(dvp);
655 ASSERT(parent);
656
657 rw_enter(&parent->sdev_dotdot->sdev_contents, RW_READER);
658 if (parent->sdev_state == SDEV_ZOMBIE) {
659 rw_exit(&parent->sdev_dotdot->sdev_contents);
660 return (ENOENT);
661 }
662
663 /* non-global do not allow pure node creation */
664 if (!SDEV_IS_GLOBAL(parent)) {
665 rw_exit(&parent->sdev_dotdot->sdev_contents);
666 return (prof_lookup(dvp, nm, vpp, cred));
667 }
668 rw_exit(&parent->sdev_dotdot->sdev_contents);
669
670 /* execute access is required to search the directory */
671 if ((error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct)) != 0)
672 return (error);
673
674 /* check existing name */
675 /* XXXci - We may need to translate the C-I flags on VOP_LOOKUP */
676 error = VOP_LOOKUP(dvp, nm, &vp, NULL, 0, NULL, cred, ct, NULL, NULL);
677
678 /* name found */
679 if (error == 0) {
680 ASSERT(vp);
681 if (excl == EXCL) {
682 error = EEXIST;
683 } else if ((vp->v_type == VDIR) && (mode & VWRITE)) {
684 /* allowing create/read-only an existing directory */
685 error = EISDIR;
686 } else {
687 error = VOP_ACCESS(vp, mode, 0, cred, ct);
688 }
689
690 if (error) {
691 VN_RELE(vp);
692 return (error);
693 }
694
695 /* truncation first */
696 if ((vp->v_type == VREG) && (vap->va_mask & AT_SIZE) &&
697 (vap->va_size == 0)) {
698 ASSERT(parent->sdev_attrvp);
699 error = VOP_CREATE(parent->sdev_attrvp,
700 nm, vap, excl, mode, &avp, cred, flag, ct, vsecp);
701
702 if (error) {
703 VN_RELE(vp);
704 return (error);
705 }
706 }
707
708 sdev_update_timestamps(vp, kcred,
709 AT_CTIME|AT_MTIME|AT_ATIME);
710 *vpp = vp;
711 return (0);
712 }
713
714 /* bail out early */
715 if (error != ENOENT)
716 return (error);
717
718 /* verify write access - compliance specifies ENXIO */
719 if ((error = VOP_ACCESS(dvp, VEXEC|VWRITE, 0, cred, ct)) != 0) {
720 if (error == EACCES)
721 error = ENXIO;
722 return (error);
723 }
724
725 /*
726 * For memory-based (ROFS) directory:
727 * - either disallow node creation;
728 * - or implement VOP_CREATE of its own
729 */
730 rw_enter(&parent->sdev_contents, RW_WRITER);
731 if (!SDEV_IS_PERSIST(parent)) {
732 rw_exit(&parent->sdev_contents);
733 return (ENOTSUP);
734 }
735 ASSERT(parent->sdev_attrvp);
736 error = sdev_mknode(parent, nm, &self, vap, NULL, NULL,
737 cred, SDEV_READY);
738 if (error) {
739 rw_exit(&parent->sdev_contents);
740 if (self)
741 SDEV_RELE(self);
742 return (error);
743 }
744 rw_exit(&parent->sdev_contents);
745
746 ASSERT(self);
747 /* take care the timestamps for the node and its parent */
748 sdev_update_timestamps(SDEVTOV(self), kcred,
749 AT_CTIME|AT_MTIME|AT_ATIME);
750 sdev_update_timestamps(dvp, kcred, AT_MTIME|AT_ATIME);
751 if (SDEV_IS_GLOBAL(parent))
752 atomic_inc_ulong(&parent->sdev_gdir_gen);
753
754 /* wake up other threads blocked on looking up this node */
755 mutex_enter(&self->sdev_lookup_lock);
756 SDEV_UNBLOCK_OTHERS(self, SDEV_LOOKUP);
757 mutex_exit(&self->sdev_lookup_lock);
758 error = sdev_to_vp(self, vpp);
759 return (error);
760 }
761
762 static int
763 sdev_remove(struct vnode *dvp, char *nm, struct cred *cred,
764 caller_context_t *ct, int flags)
765 {
766 int error;
767 struct sdev_node *parent = (struct sdev_node *)VTOSDEV(dvp);
768 struct vnode *vp = NULL;
769 struct sdev_node *dv = NULL;
770 int len;
771 int bkstore;
772
773 /* bail out early */
774 len = strlen(nm);
775 if (nm[0] == '.') {
776 if (len == 1) {
777 return (EINVAL);
778 } else if (len == 2 && nm[1] == '.') {
779 return (EEXIST);
780 }
781 }
782
783 ASSERT(parent);
784 rw_enter(&parent->sdev_contents, RW_READER);
785 if (!SDEV_IS_GLOBAL(parent)) {
786 rw_exit(&parent->sdev_contents);
787 return (ENOTSUP);
788 }
789
790 /* execute access is required to search the directory */
791 if ((error = sdev_self_access(parent, VEXEC, 0, cred, ct)) != 0) {
792 rw_exit(&parent->sdev_contents);
793 return (error);
794 }
795
796 /* check existence first */
797 dv = sdev_cache_lookup(parent, nm);
798 if (dv == NULL) {
799 rw_exit(&parent->sdev_contents);
800 return (ENOENT);
801 }
802
803 vp = SDEVTOV(dv);
804 if ((dv->sdev_state == SDEV_INIT) ||
805 (dv->sdev_state == SDEV_ZOMBIE)) {
806 rw_exit(&parent->sdev_contents);
807 VN_RELE(vp);
808 return (ENOENT);
809 }
810
811 /* write access is required to remove an entry */
812 if ((error = sdev_self_access(parent, VWRITE, 0, cred, ct)) != 0) {
813 rw_exit(&parent->sdev_contents);
814 VN_RELE(vp);
815 return (error);
816 }
817
818 bkstore = SDEV_IS_PERSIST(dv) ? 1 : 0;
819 if (!rw_tryupgrade(&parent->sdev_contents)) {
820 rw_exit(&parent->sdev_contents);
821 rw_enter(&parent->sdev_contents, RW_WRITER);
822 /* Make sure we didn't become a zombie */
823 if (parent->sdev_state == SDEV_ZOMBIE) {
824 rw_exit(&parent->sdev_contents);
825 VN_RELE(vp);
826 return (ENOENT);
827 }
828 }
829
830 /* we do not support unlinking a non-empty directory */
831 if (vp->v_type == VDIR && dv->sdev_nlink > 2) {
832 rw_exit(&parent->sdev_contents);
833 VN_RELE(vp);
834 return (EBUSY);
835 }
836
837 /*
838 * sdev_dirdelete does the real job of:
839 * - make sure no open ref count
840 * - destroying the sdev_node
841 * - releasing the hold on attrvp
842 */
843 sdev_cache_update(parent, &dv, nm, SDEV_CACHE_DELETE);
844 VN_RELE(vp);
845 rw_exit(&parent->sdev_contents);
846
847 /*
848 * best efforts clean up the backing store
849 */
850 if (bkstore) {
851 ASSERT(parent->sdev_attrvp);
852 error = VOP_REMOVE(parent->sdev_attrvp, nm, cred,
853 ct, flags);
854 /*
855 * do not report BUSY error
856 * because the backing store ref count is released
857 * when the last ref count on the sdev_node is
858 * released.
859 */
860 if (error == EBUSY) {
861 sdcmn_err2(("sdev_remove: device %s is still on"
862 "disk %s\n", nm, parent->sdev_path));
863 error = 0;
864 }
865 }
866
867 return (error);
868 }
869
870 /*
871 * Some restrictions for this file system:
872 * - both oldnm and newnm are in the scope of /dev file system,
873 * to simply the namespace management model.
874 */
875 /*ARGSUSED6*/
876 static int
877 sdev_rename(struct vnode *odvp, char *onm, struct vnode *ndvp, char *nnm,
878 struct cred *cred, caller_context_t *ct, int flags)
879 {
880 struct sdev_node *fromparent = NULL;
881 struct vattr vattr;
882 struct sdev_node *toparent;
883 struct sdev_node *fromdv = NULL; /* source node */
884 struct vnode *ovp = NULL; /* source vnode */
885 struct sdev_node *todv = NULL; /* destination node */
886 struct vnode *nvp = NULL; /* destination vnode */
887 int samedir = 0; /* set if odvp == ndvp */
888 struct vnode *realvp;
889 int error = 0;
890 dev_t fsid;
891 int bkstore = 0;
892 vtype_t type;
893
894 /* prevent modifying "." and ".." */
895 if ((onm[0] == '.' &&
896 (onm[1] == '\0' || (onm[1] == '.' && onm[2] == '\0'))) ||
897 (nnm[0] == '.' &&
898 (nnm[1] == '\0' || (nnm[1] == '.' && nnm[2] == '\0')))) {
899 return (EINVAL);
900 }
901
902 fromparent = VTOSDEV(odvp);
903 toparent = VTOSDEV(ndvp);
904
905 /* ZOMBIE parent doesn't allow new node creation */
906 rw_enter(&fromparent->sdev_dotdot->sdev_contents, RW_READER);
907 if (fromparent->sdev_state == SDEV_ZOMBIE) {
908 rw_exit(&fromparent->sdev_dotdot->sdev_contents);
909 return (ENOENT);
910 }
911
912 /* renaming only supported for global device nodes */
913 if (!SDEV_IS_GLOBAL(fromparent)) {
914 rw_exit(&fromparent->sdev_dotdot->sdev_contents);
915 return (ENOTSUP);
916 }
917 rw_exit(&fromparent->sdev_dotdot->sdev_contents);
918
919 rw_enter(&toparent->sdev_dotdot->sdev_contents, RW_READER);
920 if (toparent->sdev_state == SDEV_ZOMBIE) {
921 rw_exit(&toparent->sdev_dotdot->sdev_contents);
922 return (ENOENT);
923 }
924 rw_exit(&toparent->sdev_dotdot->sdev_contents);
925
926 /*
927 * acquire the global lock to prevent
928 * mount/unmount/other rename activities.
929 */
930 mutex_enter(&sdev_lock);
931
932 /* check existence of the source node */
933 /* XXXci - We may need to translate the C-I flags on VOP_LOOKUP */
934 error = VOP_LOOKUP(odvp, onm, &ovp, NULL, 0, NULL, cred, ct,
935 NULL, NULL);
936 if (error) {
937 sdcmn_err2(("sdev_rename: the source node %s exists\n",
938 onm));
939 mutex_exit(&sdev_lock);
940 return (error);
941 }
942
943 if (VOP_REALVP(ovp, &realvp, ct) == 0) {
944 VN_HOLD(realvp);
945 VN_RELE(ovp);
946 ovp = realvp;
947 }
948
949 /* check existence of destination */
950 /* XXXci - We may need to translate the C-I flags on VOP_LOOKUP */
951 error = VOP_LOOKUP(ndvp, nnm, &nvp, NULL, 0, NULL, cred, ct,
952 NULL, NULL);
953 if (error && (error != ENOENT)) {
954 mutex_exit(&sdev_lock);
955 VN_RELE(ovp);
956 return (error);
957 }
958
959 if (nvp && (VOP_REALVP(nvp, &realvp, ct) == 0)) {
960 VN_HOLD(realvp);
961 VN_RELE(nvp);
962 nvp = realvp;
963 }
964
965 /*
966 * make sure the source and the destination are
967 * in the same dev filesystem
968 */
969 if (odvp != ndvp) {
970 vattr.va_mask = AT_FSID;
971 if (error = VOP_GETATTR(odvp, &vattr, 0, cred, ct)) {
972 mutex_exit(&sdev_lock);
973 VN_RELE(ovp);
974 if (nvp != NULL)
975 VN_RELE(nvp);
976 return (error);
977 }
978 fsid = vattr.va_fsid;
979 vattr.va_mask = AT_FSID;
980 if (error = VOP_GETATTR(ndvp, &vattr, 0, cred, ct)) {
981 mutex_exit(&sdev_lock);
982 VN_RELE(ovp);
983 if (nvp != NULL)
984 VN_RELE(nvp);
985 return (error);
986 }
987 if (fsid != vattr.va_fsid) {
988 mutex_exit(&sdev_lock);
989 VN_RELE(ovp);
990 if (nvp != NULL)
991 VN_RELE(nvp);
992 return (EXDEV);
993 }
994 }
995
996 /* make sure the old entry can be deleted */
997 error = VOP_ACCESS(odvp, VWRITE, 0, cred, ct);
998 if (error) {
999 mutex_exit(&sdev_lock);
1000 VN_RELE(ovp);
1001 if (nvp != NULL)
1002 VN_RELE(nvp);
1003 return (error);
1004 }
1005
1006 /* make sure the destination allows creation */
1007 samedir = (fromparent == toparent);
1008 if (!samedir) {
1009 error = VOP_ACCESS(ndvp, VEXEC|VWRITE, 0, cred, ct);
1010 if (error) {
1011 mutex_exit(&sdev_lock);
1012 VN_RELE(ovp);
1013 if (nvp != NULL)
1014 VN_RELE(nvp);
1015 return (error);
1016 }
1017 }
1018
1019 fromdv = VTOSDEV(ovp);
1020 ASSERT(fromdv);
1021
1022 /* destination file exists */
1023 if (nvp != NULL) {
1024 todv = VTOSDEV(nvp);
1025 ASSERT(todv);
1026 }
1027
1028 if ((fromdv->sdev_flags & SDEV_DYNAMIC) != 0 ||
1029 (todv != NULL && (todv->sdev_flags & SDEV_DYNAMIC) != 0)) {
1030 mutex_exit(&sdev_lock);
1031 if (nvp != NULL)
1032 VN_RELE(nvp);
1033 VN_RELE(ovp);
1034 return (EACCES);
1035 }
1036
1037 /*
1038 * link source to new target in the memory. Regardless of failure, we
1039 * must rele our hold on nvp.
1040 */
1041 error = sdev_rnmnode(fromparent, fromdv, toparent, &todv, nnm, cred);
1042 if (nvp != NULL)
1043 VN_RELE(nvp);
1044 if (error) {
1045 sdcmn_err2(("sdev_rename: renaming %s to %s failed "
1046 " with error %d\n", onm, nnm, error));
1047 mutex_exit(&sdev_lock);
1048 VN_RELE(ovp);
1049 return (error);
1050 }
1051
1052 /*
1053 * unlink from source
1054 */
1055 rw_enter(&fromparent->sdev_contents, RW_READER);
1056 fromdv = sdev_cache_lookup(fromparent, onm);
1057 if (fromdv == NULL) {
1058 rw_exit(&fromparent->sdev_contents);
1059 mutex_exit(&sdev_lock);
1060 VN_RELE(ovp);
1061 sdcmn_err2(("sdev_rename: the source is deleted already\n"));
1062 return (0);
1063 }
1064
1065 if (fromdv->sdev_state == SDEV_ZOMBIE) {
1066 rw_exit(&fromparent->sdev_contents);
1067 mutex_exit(&sdev_lock);
1068 VN_RELE(SDEVTOV(fromdv));
1069 VN_RELE(ovp);
1070 sdcmn_err2(("sdev_rename: the source is being deleted\n"));
1071 return (0);
1072 }
1073 rw_exit(&fromparent->sdev_contents);
1074 ASSERT(SDEVTOV(fromdv) == ovp);
1075 VN_RELE(ovp);
1076
1077 /* clean out the directory contents before it can be removed */
1078 type = SDEVTOV(fromdv)->v_type;
1079 if (type == VDIR) {
1080 error = sdev_cleandir(fromdv, NULL, 0);
1081 sdcmn_err2(("sdev_rename: cleandir finished with %d\n",
1082 error));
1083 if (error == EBUSY)
1084 error = 0;
1085 }
1086
1087 rw_enter(&fromparent->sdev_contents, RW_WRITER);
1088 bkstore = SDEV_IS_PERSIST(fromdv) ? 1 : 0;
1089 sdev_cache_update(fromparent, &fromdv, onm,
1090 SDEV_CACHE_DELETE);
1091 VN_RELE(SDEVTOV(fromdv));
1092
1093 /* best effforts clean up the backing store */
1094 if (bkstore) {
1095 ASSERT(fromparent->sdev_attrvp);
1096 if (type != VDIR) {
1097 /* XXXci - We may need to translate the C-I flags on VOP_REMOVE */
1098 error = VOP_REMOVE(fromparent->sdev_attrvp,
1099 onm, kcred, ct, 0);
1100 } else {
1101 /* XXXci - We may need to translate the C-I flags on VOP_RMDIR */
1102 error = VOP_RMDIR(fromparent->sdev_attrvp,
1103 onm, fromparent->sdev_attrvp, kcred, ct, 0);
1104 }
1105
1106 if (error) {
1107 sdcmn_err2(("sdev_rename: device %s is "
1108 "still on disk %s\n", onm,
1109 fromparent->sdev_path));
1110 error = 0;
1111 }
1112 }
1113 rw_exit(&fromparent->sdev_contents);
1114 mutex_exit(&sdev_lock);
1115
1116 /* once reached to this point, the rename is regarded successful */
1117 return (0);
1118 }
1119
1120 /*
1121 * dev-fs version of "ln -s path dev-name"
1122 * tnm - path, e.g. /devices/... or /dev/...
1123 * lnm - dev_name
1124 */
1125 /*ARGSUSED6*/
1126 static int
1127 sdev_symlink(struct vnode *dvp, char *lnm, struct vattr *tva,
1128 char *tnm, struct cred *cred, caller_context_t *ct, int flags)
1129 {
1130 int error;
1131 struct vnode *vp = NULL;
1132 struct sdev_node *parent = (struct sdev_node *)VTOSDEV(dvp);
1133 struct sdev_node *self = (struct sdev_node *)NULL;
1134
1135 ASSERT(parent);
1136 rw_enter(&parent->sdev_dotdot->sdev_contents, RW_READER);
1137 if (parent->sdev_state == SDEV_ZOMBIE) {
1138 rw_exit(&parent->sdev_dotdot->sdev_contents);
1139 sdcmn_err2(("sdev_symlink: parent %s is ZOMBIED \n",
1140 parent->sdev_name));
1141 return (ENOENT);
1142 }
1143
1144 if (!SDEV_IS_GLOBAL(parent)) {
1145 rw_exit(&parent->sdev_dotdot->sdev_contents);
1146 return (ENOTSUP);
1147 }
1148 rw_exit(&parent->sdev_dotdot->sdev_contents);
1149
1150 /* execute access is required to search a directory */
1151 if ((error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct)) != 0)
1152 return (error);
1153
1154 /* find existing name */
1155 /* XXXci - We may need to translate the C-I flags here */
1156 error = VOP_LOOKUP(dvp, lnm, &vp, NULL, 0, NULL, cred, ct, NULL, NULL);
1157 if (error == 0) {
1158 ASSERT(vp);
1159 VN_RELE(vp);
1160 sdcmn_err2(("sdev_symlink: node %s already exists\n", lnm));
1161 return (EEXIST);
1162 }
1163 if (error != ENOENT)
1164 return (error);
1165
1166 /* write access is required to create a symlink */
1167 if ((error = VOP_ACCESS(dvp, VWRITE, 0, cred, ct)) != 0)
1168 return (error);
1169
1170 /* put it into memory cache */
1171 rw_enter(&parent->sdev_contents, RW_WRITER);
1172 error = sdev_mknode(parent, lnm, &self, tva, NULL, (void *)tnm,
1173 cred, SDEV_READY);
1174 if (error) {
1175 rw_exit(&parent->sdev_contents);
1176 sdcmn_err2(("sdev_symlink: node %s creation failed\n", lnm));
1177 if (self)
1178 SDEV_RELE(self);
1179
1180 return (error);
1181 }
1182 ASSERT(self && (self->sdev_state == SDEV_READY));
1183 rw_exit(&parent->sdev_contents);
1184
1185 /* take care the timestamps for the node and its parent */
1186 sdev_update_timestamps(SDEVTOV(self), kcred,
1187 AT_CTIME|AT_MTIME|AT_ATIME);
1188 sdev_update_timestamps(dvp, kcred, AT_MTIME|AT_ATIME);
1189 if (SDEV_IS_GLOBAL(parent))
1190 atomic_inc_ulong(&parent->sdev_gdir_gen);
1191
1192 /* wake up other threads blocked on looking up this node */
1193 mutex_enter(&self->sdev_lookup_lock);
1194 SDEV_UNBLOCK_OTHERS(self, SDEV_LOOKUP);
1195 mutex_exit(&self->sdev_lookup_lock);
1196 SDEV_RELE(self); /* don't return with vnode held */
1197 return (0);
1198 }
1199
1200 /*ARGSUSED6*/
1201 static int
1202 sdev_mkdir(struct vnode *dvp, char *nm, struct vattr *va, struct vnode **vpp,
1203 struct cred *cred, caller_context_t *ct, int flags, vsecattr_t *vsecp)
1204 {
1205 int error;
1206 struct sdev_node *parent = (struct sdev_node *)VTOSDEV(dvp);
1207 struct sdev_node *self = NULL;
1208 struct vnode *vp = NULL;
1209
1210 ASSERT(parent && parent->sdev_dotdot);
1211 rw_enter(&parent->sdev_dotdot->sdev_contents, RW_READER);
1212 if (parent->sdev_state == SDEV_ZOMBIE) {
1213 rw_exit(&parent->sdev_dotdot->sdev_contents);
1214 return (ENOENT);
1215 }
1216
1217 /* non-global do not allow pure directory creation */
1218 if (!SDEV_IS_GLOBAL(parent)) {
1219 rw_exit(&parent->sdev_dotdot->sdev_contents);
1220 return (prof_lookup(dvp, nm, vpp, cred));
1221 }
1222 rw_exit(&parent->sdev_dotdot->sdev_contents);
1223
1224 /* execute access is required to search the directory */
1225 if ((error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct)) != 0) {
1226 return (error);
1227 }
1228
1229 /* find existing name */
1230 /* XXXci - We may need to translate the C-I flags on VOP_LOOKUP */
1231 error = VOP_LOOKUP(dvp, nm, &vp, NULL, 0, NULL, cred, ct, NULL, NULL);
1232 if (error == 0) {
1233 VN_RELE(vp);
1234 return (EEXIST);
1235 }
1236 if (error != ENOENT)
1237 return (error);
1238
1239 /* require write access to create a directory */
1240 if ((error = VOP_ACCESS(dvp, VWRITE, 0, cred, ct)) != 0) {
1241 return (error);
1242 }
1243
1244 /* put it into memory */
1245 rw_enter(&parent->sdev_contents, RW_WRITER);
1246 error = sdev_mknode(parent, nm, &self,
1247 va, NULL, NULL, cred, SDEV_READY);
1248 if (error) {
1249 rw_exit(&parent->sdev_contents);
1250 if (self)
1251 SDEV_RELE(self);
1252 return (error);
1253 }
1254 ASSERT(self && (self->sdev_state == SDEV_READY));
1255 rw_exit(&parent->sdev_contents);
1256
1257 /* take care the timestamps for the node and its parent */
1258 sdev_update_timestamps(SDEVTOV(self), kcred,
1259 AT_CTIME|AT_MTIME|AT_ATIME);
1260 sdev_update_timestamps(dvp, kcred, AT_MTIME|AT_ATIME);
1261 if (SDEV_IS_GLOBAL(parent))
1262 atomic_inc_ulong(&parent->sdev_gdir_gen);
1263
1264 /* wake up other threads blocked on looking up this node */
1265 mutex_enter(&self->sdev_lookup_lock);
1266 SDEV_UNBLOCK_OTHERS(self, SDEV_LOOKUP);
1267 mutex_exit(&self->sdev_lookup_lock);
1268 *vpp = SDEVTOV(self);
1269 return (0);
1270 }
1271
1272 /*
1273 * allowing removing an empty directory under /dev
1274 */
1275 /*ARGSUSED*/
1276 static int
1277 sdev_rmdir(struct vnode *dvp, char *nm, struct vnode *cdir, struct cred *cred,
1278 caller_context_t *ct, int flags)
1279 {
1280 int error = 0;
1281 struct sdev_node *parent = (struct sdev_node *)VTOSDEV(dvp);
1282 struct sdev_node *self = NULL;
1283 struct vnode *vp = NULL;
1284
1285 /* bail out early */
1286 if (strcmp(nm, ".") == 0)
1287 return (EINVAL);
1288 if (strcmp(nm, "..") == 0)
1289 return (EEXIST); /* should be ENOTEMPTY */
1290
1291 /* no destruction of non-global node */
1292 ASSERT(parent && parent->sdev_dotdot);
1293 rw_enter(&parent->sdev_dotdot->sdev_contents, RW_READER);
1294 if (!SDEV_IS_GLOBAL(parent)) {
1295 rw_exit(&parent->sdev_dotdot->sdev_contents);
1296 return (ENOTSUP);
1297 }
1298 rw_exit(&parent->sdev_dotdot->sdev_contents);
1299
1300 /* execute access is required to search the directory */
1301 if ((error = VOP_ACCESS(dvp, VEXEC|VWRITE, 0, cred, ct)) != 0)
1302 return (error);
1303
1304 /* check existing name */
1305 rw_enter(&parent->sdev_contents, RW_WRITER);
1306 self = sdev_cache_lookup(parent, nm);
1307 if (self == NULL) {
1308 rw_exit(&parent->sdev_contents);
1309 return (ENOENT);
1310 }
1311
1312 vp = SDEVTOV(self);
1313 if ((self->sdev_state == SDEV_INIT) ||
1314 (self->sdev_state == SDEV_ZOMBIE)) {
1315 rw_exit(&parent->sdev_contents);
1316 VN_RELE(vp);
1317 return (ENOENT);
1318 }
1319
1320 /* some sanity checks */
1321 if (vp == dvp || vp == cdir) {
1322 rw_exit(&parent->sdev_contents);
1323 VN_RELE(vp);
1324 return (EINVAL);
1325 }
1326
1327 if (vp->v_type != VDIR) {
1328 rw_exit(&parent->sdev_contents);
1329 VN_RELE(vp);
1330 return (ENOTDIR);
1331 }
1332
1333 if (vn_vfswlock(vp)) {
1334 rw_exit(&parent->sdev_contents);
1335 VN_RELE(vp);
1336 return (EBUSY);
1337 }
1338
1339 if (vn_mountedvfs(vp) != NULL) {
1340 rw_exit(&parent->sdev_contents);
1341 vn_vfsunlock(vp);
1342 VN_RELE(vp);
1343 return (EBUSY);
1344 }
1345
1346 self = VTOSDEV(vp);
1347 /* bail out on a non-empty directory */
1348 rw_enter(&self->sdev_contents, RW_READER);
1349 if (self->sdev_nlink > 2) {
1350 rw_exit(&self->sdev_contents);
1351 rw_exit(&parent->sdev_contents);
1352 vn_vfsunlock(vp);
1353 VN_RELE(vp);
1354 return (ENOTEMPTY);
1355 }
1356 rw_exit(&self->sdev_contents);
1357
1358 /* unlink it from the directory cache */
1359 sdev_cache_update(parent, &self, nm, SDEV_CACHE_DELETE);
1360 rw_exit(&parent->sdev_contents);
1361 vn_vfsunlock(vp);
1362 VN_RELE(vp);
1363
1364 /* best effort to clean up the backing store */
1365 if (SDEV_IS_PERSIST(parent)) {
1366 ASSERT(parent->sdev_attrvp);
1367 error = VOP_RMDIR(parent->sdev_attrvp, nm,
1368 parent->sdev_attrvp, kcred, ct, flags);
1369
1370 if (error)
1371 sdcmn_err2(("sdev_rmdir: cleaning device %s is on"
1372 " disk error %d\n", parent->sdev_path, error));
1373 if (error == EBUSY)
1374 error = 0;
1375
1376 }
1377
1378 return (error);
1379 }
1380
1381 /*
1382 * read the contents of a symbolic link
1383 */
1384 static int
1385 sdev_readlink(struct vnode *vp, struct uio *uiop, struct cred *cred,
1386 caller_context_t *ct)
1387 {
1388 struct sdev_node *dv;
1389 int error = 0;
1390
1391 ASSERT(vp->v_type == VLNK);
1392
1393 dv = VTOSDEV(vp);
1394
1395 if (dv->sdev_attrvp) {
1396 /* non-NULL attrvp implys a persisted node at READY state */
1397 return (VOP_READLINK(dv->sdev_attrvp, uiop, cred, ct));
1398 } else if (dv->sdev_symlink != NULL) {
1399 /* memory nodes, e.g. local nodes */
1400 rw_enter(&dv->sdev_contents, RW_READER);
1401 sdcmn_err2(("sdev_readlink link is %s\n", dv->sdev_symlink));
1402 error = uiomove(dv->sdev_symlink, strlen(dv->sdev_symlink),
1403 UIO_READ, uiop);
1404 rw_exit(&dv->sdev_contents);
1405 return (error);
1406 }
1407
1408 return (ENOENT);
1409 }
1410
1411 /*ARGSUSED4*/
1412 static int
1413 sdev_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred, int *eofp,
1414 caller_context_t *ct, int flags)
1415 {
1416 struct sdev_node *parent = VTOSDEV(dvp);
1417 int error;
1418
1419 /*
1420 * We must check that we have execute access to search the directory --
1421 * but because our sdev_contents lock is already held as a reader (the
1422 * caller must have done a VOP_RWLOCK()), we call directly into the
1423 * underlying access routine if sdev_attr is non-NULL.
1424 */
1425 if (parent->sdev_attr != NULL) {
1426 VERIFY(RW_READ_HELD(&parent->sdev_contents));
1427
1428 if (sdev_unlocked_access(parent, VEXEC, cred) != 0)
1429 return (EACCES);
1430 } else {
1431 if ((error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct)) != 0)
1432 return (error);
1433 }
1434
1435 ASSERT(parent);
1436 if (!SDEV_IS_GLOBAL(parent))
1437 prof_filldir(parent);
1438 return (devname_readdir_func(dvp, uiop, cred, eofp, SDEV_BROWSE));
1439 }
1440
1441 /*ARGSUSED1*/
1442 static void
1443 sdev_inactive(struct vnode *vp, struct cred *cred, caller_context_t *ct)
1444 {
1445 devname_inactive_func(vp, cred, NULL);
1446 }
1447
1448 /*ARGSUSED2*/
1449 static int
1450 sdev_fid(struct vnode *vp, struct fid *fidp, caller_context_t *ct)
1451 {
1452 struct sdev_node *dv = VTOSDEV(vp);
1453 struct sdev_fid *sdev_fid;
1454
1455 if (fidp->fid_len < (sizeof (struct sdev_fid) - sizeof (ushort_t))) {
1456 fidp->fid_len = sizeof (struct sdev_fid) - sizeof (ushort_t);
1457 return (ENOSPC);
1458 }
1459
1460 sdev_fid = (struct sdev_fid *)fidp;
1461 bzero(sdev_fid, sizeof (struct sdev_fid));
1462 sdev_fid->sdevfid_len =
1463 (int)sizeof (struct sdev_fid) - sizeof (ushort_t);
1464 sdev_fid->sdevfid_ino = dv->sdev_ino;
1465
1466 return (0);
1467 }
1468
1469 /*
1470 * This pair of routines bracket all VOP_READ, VOP_WRITE
1471 * and VOP_READDIR requests. The contents lock stops things
1472 * moving around while we're looking at them.
1473 */
1474 /*ARGSUSED2*/
1475 static int
1476 sdev_rwlock(struct vnode *vp, int write_flag, caller_context_t *ctp)
1477 {
1478 rw_enter(&VTOSDEV(vp)->sdev_contents,
1479 write_flag ? RW_WRITER : RW_READER);
1480 return (write_flag ? V_WRITELOCK_TRUE : V_WRITELOCK_FALSE);
1481 }
1482
1483 /*ARGSUSED1*/
1484 static void
1485 sdev_rwunlock(struct vnode *vp, int write_flag, caller_context_t *ctp)
1486 {
1487 rw_exit(&VTOSDEV(vp)->sdev_contents);
1488 }
1489
1490 /*ARGSUSED1*/
1491 static int
1492 sdev_seek(struct vnode *vp, offset_t ooff, offset_t *noffp,
1493 caller_context_t *ct)
1494 {
1495 struct vnode *attrvp = VTOSDEV(vp)->sdev_attrvp;
1496
1497 ASSERT(vp->v_type != VCHR &&
1498 vp->v_type != VBLK && vp->v_type != VLNK);
1499
1500 if (vp->v_type == VDIR)
1501 return (fs_seek(vp, ooff, noffp, ct));
1502
1503 ASSERT(attrvp);
1504 return (VOP_SEEK(attrvp, ooff, noffp, ct));
1505 }
1506
1507 /*ARGSUSED1*/
1508 static int
1509 sdev_frlock(struct vnode *vp, int cmd, struct flock64 *bfp, int flag,
1510 offset_t offset, struct flk_callback *flk_cbp, struct cred *cr,
1511 caller_context_t *ct)
1512 {
1513 int error;
1514 struct sdev_node *dv = VTOSDEV(vp);
1515
1516 ASSERT(dv);
1517 ASSERT(dv->sdev_attrvp);
1518 error = VOP_FRLOCK(dv->sdev_attrvp, cmd, bfp, flag, offset,
1519 flk_cbp, cr, ct);
1520
1521 return (error);
1522 }
1523
1524 static int
1525 sdev_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
1526 caller_context_t *ct)
1527 {
1528 switch (cmd) {
1529 case _PC_ACL_ENABLED:
1530 *valp = SDEV_ACL_FLAVOR(vp);
1531 return (0);
1532 }
1533
1534 return (fs_pathconf(vp, cmd, valp, cr, ct));
1535 }
1536
1537 vnodeops_t *sdev_vnodeops;
1538
1539 const fs_operation_def_t sdev_vnodeops_tbl[] = {
1540 VOPNAME_OPEN, { .vop_open = sdev_open },
1541 VOPNAME_CLOSE, { .vop_close = sdev_close },
1542 VOPNAME_READ, { .vop_read = sdev_read },
1543 VOPNAME_WRITE, { .vop_write = sdev_write },
1544 VOPNAME_IOCTL, { .vop_ioctl = sdev_ioctl },
1545 VOPNAME_GETATTR, { .vop_getattr = sdev_getattr },
1546 VOPNAME_SETATTR, { .vop_setattr = sdev_setattr },
1547 VOPNAME_ACCESS, { .vop_access = sdev_access },
1548 VOPNAME_LOOKUP, { .vop_lookup = sdev_lookup },
1549 VOPNAME_CREATE, { .vop_create = sdev_create },
1550 VOPNAME_RENAME, { .vop_rename = sdev_rename },
1551 VOPNAME_REMOVE, { .vop_remove = sdev_remove },
1552 VOPNAME_MKDIR, { .vop_mkdir = sdev_mkdir },
1553 VOPNAME_RMDIR, { .vop_rmdir = sdev_rmdir },
1554 VOPNAME_READDIR, { .vop_readdir = sdev_readdir },
1555 VOPNAME_SYMLINK, { .vop_symlink = sdev_symlink },
1556 VOPNAME_READLINK, { .vop_readlink = sdev_readlink },
1557 VOPNAME_INACTIVE, { .vop_inactive = sdev_inactive },
1558 VOPNAME_FID, { .vop_fid = sdev_fid },
1559 VOPNAME_RWLOCK, { .vop_rwlock = sdev_rwlock },
1560 VOPNAME_RWUNLOCK, { .vop_rwunlock = sdev_rwunlock },
1561 VOPNAME_SEEK, { .vop_seek = sdev_seek },
1562 VOPNAME_FRLOCK, { .vop_frlock = sdev_frlock },
1563 VOPNAME_PATHCONF, { .vop_pathconf = sdev_pathconf },
1564 VOPNAME_SETSECATTR, { .vop_setsecattr = sdev_setsecattr },
1565 VOPNAME_GETSECATTR, { .vop_getsecattr = sdev_getsecattr },
1566 NULL, NULL
1567 };
1568
1569 int sdev_vnodeops_tbl_size = sizeof (sdev_vnodeops_tbl);