1 | /* $NetBSD: spec_vnops.c,v 1.165 2016/09/08 08:45:52 pgoyette Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
26 | * POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
28 | |
29 | /* |
30 | * Copyright (c) 1989, 1993 |
31 | * The Regents of the University of California. All rights reserved. |
32 | * |
33 | * Redistribution and use in source and binary forms, with or without |
34 | * modification, are permitted provided that the following conditions |
35 | * are met: |
36 | * 1. Redistributions of source code must retain the above copyright |
37 | * notice, this list of conditions and the following disclaimer. |
38 | * 2. Redistributions in binary form must reproduce the above copyright |
39 | * notice, this list of conditions and the following disclaimer in the |
40 | * documentation and/or other materials provided with the distribution. |
41 | * 3. Neither the name of the University nor the names of its contributors |
42 | * may be used to endorse or promote products derived from this software |
43 | * without specific prior written permission. |
44 | * |
45 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
55 | * SUCH DAMAGE. |
56 | * |
57 | * @(#)spec_vnops.c 8.15 (Berkeley) 7/14/95 |
58 | */ |
59 | |
60 | #include <sys/cdefs.h> |
61 | __KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.165 2016/09/08 08:45:52 pgoyette Exp $" ); |
62 | |
63 | #include <sys/param.h> |
64 | #include <sys/proc.h> |
65 | #include <sys/systm.h> |
66 | #include <sys/kernel.h> |
67 | #include <sys/conf.h> |
68 | #include <sys/buf.h> |
69 | #include <sys/mount.h> |
70 | #include <sys/namei.h> |
71 | #include <sys/vnode.h> |
72 | #include <sys/stat.h> |
73 | #include <sys/errno.h> |
74 | #include <sys/ioctl.h> |
75 | #include <sys/poll.h> |
76 | #include <sys/file.h> |
77 | #include <sys/disklabel.h> |
78 | #include <sys/lockf.h> |
79 | #include <sys/tty.h> |
80 | #include <sys/kauth.h> |
81 | #include <sys/fstrans.h> |
82 | #include <sys/module.h> |
83 | |
84 | #include <miscfs/genfs/genfs.h> |
85 | #include <miscfs/specfs/specdev.h> |
86 | |
87 | /* symbolic sleep message strings for devices */ |
88 | const char devopn[] = "devopn" ; |
89 | const char devio[] = "devio" ; |
90 | const char devwait[] = "devwait" ; |
91 | const char devin[] = "devin" ; |
92 | const char devout[] = "devout" ; |
93 | const char devioc[] = "devioc" ; |
94 | const char devcls[] = "devcls" ; |
95 | |
96 | #define SPECHSZ 64 |
97 | #if ((SPECHSZ&(SPECHSZ-1)) == 0) |
98 | #define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1)) |
99 | #else |
100 | #define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ) |
101 | #endif |
102 | |
103 | static vnode_t *specfs_hash[SPECHSZ]; |
104 | extern struct mount *dead_rootmount; |
105 | |
106 | /* |
107 | * This vnode operations vector is used for special device nodes |
108 | * created from whole cloth by the kernel. For the ops vector for |
109 | * vnodes built from special devices found in a filesystem, see (e.g) |
110 | * ffs_specop_entries[] in ffs_vnops.c or the equivalent for other |
111 | * filesystems. |
112 | */ |
113 | |
114 | int (**spec_vnodeop_p)(void *); |
115 | const struct vnodeopv_entry_desc spec_vnodeop_entries[] = { |
116 | { &vop_default_desc, vn_default_error }, |
117 | { &vop_lookup_desc, spec_lookup }, /* lookup */ |
118 | { &vop_create_desc, spec_create }, /* create */ |
119 | { &vop_mknod_desc, spec_mknod }, /* mknod */ |
120 | { &vop_open_desc, spec_open }, /* open */ |
121 | { &vop_close_desc, spec_close }, /* close */ |
122 | { &vop_access_desc, spec_access }, /* access */ |
123 | { &vop_getattr_desc, spec_getattr }, /* getattr */ |
124 | { &vop_setattr_desc, spec_setattr }, /* setattr */ |
125 | { &vop_read_desc, spec_read }, /* read */ |
126 | { &vop_write_desc, spec_write }, /* write */ |
127 | { &vop_fallocate_desc, spec_fallocate }, /* fallocate */ |
128 | { &vop_fdiscard_desc, spec_fdiscard }, /* fdiscard */ |
129 | { &vop_fcntl_desc, spec_fcntl }, /* fcntl */ |
130 | { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ |
131 | { &vop_poll_desc, spec_poll }, /* poll */ |
132 | { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ |
133 | { &vop_revoke_desc, spec_revoke }, /* revoke */ |
134 | { &vop_mmap_desc, spec_mmap }, /* mmap */ |
135 | { &vop_fsync_desc, spec_fsync }, /* fsync */ |
136 | { &vop_seek_desc, spec_seek }, /* seek */ |
137 | { &vop_remove_desc, spec_remove }, /* remove */ |
138 | { &vop_link_desc, spec_link }, /* link */ |
139 | { &vop_rename_desc, spec_rename }, /* rename */ |
140 | { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ |
141 | { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ |
142 | { &vop_symlink_desc, spec_symlink }, /* symlink */ |
143 | { &vop_readdir_desc, spec_readdir }, /* readdir */ |
144 | { &vop_readlink_desc, spec_readlink }, /* readlink */ |
145 | { &vop_abortop_desc, spec_abortop }, /* abortop */ |
146 | { &vop_inactive_desc, spec_inactive }, /* inactive */ |
147 | { &vop_reclaim_desc, spec_reclaim }, /* reclaim */ |
148 | { &vop_lock_desc, spec_lock }, /* lock */ |
149 | { &vop_unlock_desc, spec_unlock }, /* unlock */ |
150 | { &vop_bmap_desc, spec_bmap }, /* bmap */ |
151 | { &vop_strategy_desc, spec_strategy }, /* strategy */ |
152 | { &vop_print_desc, spec_print }, /* print */ |
153 | { &vop_islocked_desc, spec_islocked }, /* islocked */ |
154 | { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ |
155 | { &vop_advlock_desc, spec_advlock }, /* advlock */ |
156 | { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ |
157 | { &vop_getpages_desc, spec_getpages }, /* getpages */ |
158 | { &vop_putpages_desc, spec_putpages }, /* putpages */ |
159 | { NULL, NULL } |
160 | }; |
161 | const struct vnodeopv_desc spec_vnodeop_opv_desc = |
162 | { &spec_vnodeop_p, spec_vnodeop_entries }; |
163 | |
164 | static kauth_listener_t rawio_listener; |
165 | |
166 | /* Returns true if vnode is /dev/mem or /dev/kmem. */ |
167 | bool |
168 | iskmemvp(struct vnode *vp) |
169 | { |
170 | return ((vp->v_type == VCHR) && iskmemdev(vp->v_rdev)); |
171 | } |
172 | |
173 | /* |
174 | * Returns true if dev is /dev/mem or /dev/kmem. |
175 | */ |
176 | int |
177 | iskmemdev(dev_t dev) |
178 | { |
179 | /* mem_no is emitted by config(8) to generated devsw.c */ |
180 | extern const int mem_no; |
181 | |
182 | /* minor 14 is /dev/io on i386 with COMPAT_10 */ |
183 | return (major(dev) == mem_no && (minor(dev) < 2 || minor(dev) == 14)); |
184 | } |
185 | |
186 | static int |
187 | rawio_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
188 | void *arg0, void *arg1, void *arg2, void *arg3) |
189 | { |
190 | int result; |
191 | |
192 | result = KAUTH_RESULT_DEFER; |
193 | |
194 | if ((action != KAUTH_DEVICE_RAWIO_SPEC) && |
195 | (action != KAUTH_DEVICE_RAWIO_PASSTHRU)) |
196 | return result; |
197 | |
198 | /* Access is mandated by permissions. */ |
199 | result = KAUTH_RESULT_ALLOW; |
200 | |
201 | return result; |
202 | } |
203 | |
204 | void |
205 | spec_init(void) |
206 | { |
207 | |
208 | rawio_listener = kauth_listen_scope(KAUTH_SCOPE_DEVICE, |
209 | rawio_listener_cb, NULL); |
210 | } |
211 | |
212 | /* |
213 | * Initialize a vnode that represents a device. |
214 | */ |
215 | void |
216 | spec_node_init(vnode_t *vp, dev_t rdev) |
217 | { |
218 | specnode_t *sn; |
219 | specdev_t *sd; |
220 | vnode_t *vp2; |
221 | vnode_t **vpp; |
222 | |
223 | KASSERT(vp->v_type == VBLK || vp->v_type == VCHR); |
224 | KASSERT(vp->v_specnode == NULL); |
225 | |
226 | /* |
227 | * Search the hash table for this device. If known, add a |
228 | * reference to the device structure. If not known, create |
229 | * a new entry to represent the device. In all cases add |
230 | * the vnode to the hash table. |
231 | */ |
232 | sn = kmem_alloc(sizeof(*sn), KM_SLEEP); |
233 | if (sn == NULL) { |
234 | /* XXX */ |
235 | panic("spec_node_init: unable to allocate memory" ); |
236 | } |
237 | sd = kmem_alloc(sizeof(*sd), KM_SLEEP); |
238 | if (sd == NULL) { |
239 | /* XXX */ |
240 | panic("spec_node_init: unable to allocate memory" ); |
241 | } |
242 | mutex_enter(&device_lock); |
243 | vpp = &specfs_hash[SPECHASH(rdev)]; |
244 | for (vp2 = *vpp; vp2 != NULL; vp2 = vp2->v_specnext) { |
245 | KASSERT(vp2->v_specnode != NULL); |
246 | if (rdev == vp2->v_rdev && vp->v_type == vp2->v_type) { |
247 | break; |
248 | } |
249 | } |
250 | if (vp2 == NULL) { |
251 | /* No existing record, create a new one. */ |
252 | sd->sd_rdev = rdev; |
253 | sd->sd_mountpoint = NULL; |
254 | sd->sd_lockf = NULL; |
255 | sd->sd_refcnt = 1; |
256 | sd->sd_opencnt = 0; |
257 | sd->sd_bdevvp = NULL; |
258 | sn->sn_dev = sd; |
259 | sd = NULL; |
260 | } else { |
261 | /* Use the existing record. */ |
262 | sn->sn_dev = vp2->v_specnode->sn_dev; |
263 | sn->sn_dev->sd_refcnt++; |
264 | } |
265 | /* Insert vnode into the hash chain. */ |
266 | sn->sn_opencnt = 0; |
267 | sn->sn_rdev = rdev; |
268 | sn->sn_gone = false; |
269 | vp->v_specnode = sn; |
270 | vp->v_specnext = *vpp; |
271 | *vpp = vp; |
272 | mutex_exit(&device_lock); |
273 | |
274 | /* Free the record we allocated if unused. */ |
275 | if (sd != NULL) { |
276 | kmem_free(sd, sizeof(*sd)); |
277 | } |
278 | } |
279 | |
280 | /* |
281 | * Lookup a vnode by device number and return it referenced. |
282 | */ |
283 | int |
284 | spec_node_lookup_by_dev(enum vtype type, dev_t dev, vnode_t **vpp) |
285 | { |
286 | int error; |
287 | vnode_t *vp; |
288 | |
289 | mutex_enter(&device_lock); |
290 | for (vp = specfs_hash[SPECHASH(dev)]; vp; vp = vp->v_specnext) { |
291 | if (type == vp->v_type && dev == vp->v_rdev) { |
292 | mutex_enter(vp->v_interlock); |
293 | /* If clean or being cleaned, then ignore it. */ |
294 | if (vdead_check(vp, VDEAD_NOWAIT) == 0) |
295 | break; |
296 | mutex_exit(vp->v_interlock); |
297 | } |
298 | } |
299 | KASSERT(vp == NULL || mutex_owned(vp->v_interlock)); |
300 | if (vp == NULL) { |
301 | mutex_exit(&device_lock); |
302 | return ENOENT; |
303 | } |
304 | /* |
305 | * If it is an opened block device return the opened vnode. |
306 | */ |
307 | if (type == VBLK && vp->v_specnode->sn_dev->sd_bdevvp != NULL) { |
308 | mutex_exit(vp->v_interlock); |
309 | vp = vp->v_specnode->sn_dev->sd_bdevvp; |
310 | mutex_enter(vp->v_interlock); |
311 | } |
312 | mutex_exit(&device_lock); |
313 | error = vget(vp, 0, true /* wait */); |
314 | if (error != 0) |
315 | return error; |
316 | *vpp = vp; |
317 | |
318 | return 0; |
319 | } |
320 | |
321 | /* |
322 | * Lookup a vnode by file system mounted on and return it referenced. |
323 | */ |
324 | int |
325 | spec_node_lookup_by_mount(struct mount *mp, vnode_t **vpp) |
326 | { |
327 | int i, error; |
328 | vnode_t *vp, *vq; |
329 | |
330 | mutex_enter(&device_lock); |
331 | for (i = 0, vq = NULL; i < SPECHSZ && vq == NULL; i++) { |
332 | for (vp = specfs_hash[i]; vp; vp = vp->v_specnext) { |
333 | if (vp->v_type != VBLK) |
334 | continue; |
335 | vq = vp->v_specnode->sn_dev->sd_bdevvp; |
336 | if (vq != NULL && |
337 | vq->v_specnode->sn_dev->sd_mountpoint == mp) |
338 | break; |
339 | vq = NULL; |
340 | } |
341 | } |
342 | if (vq == NULL) { |
343 | mutex_exit(&device_lock); |
344 | return ENOENT; |
345 | } |
346 | mutex_enter(vq->v_interlock); |
347 | mutex_exit(&device_lock); |
348 | error = vget(vq, 0, true /* wait */); |
349 | if (error != 0) |
350 | return error; |
351 | *vpp = vq; |
352 | |
353 | return 0; |
354 | |
355 | } |
356 | |
357 | /* |
358 | * Get the file system mounted on this block device. |
359 | */ |
360 | struct mount * |
361 | spec_node_getmountedfs(vnode_t *devvp) |
362 | { |
363 | struct mount *mp; |
364 | |
365 | KASSERT(devvp->v_type == VBLK); |
366 | mp = devvp->v_specnode->sn_dev->sd_mountpoint; |
367 | |
368 | return mp; |
369 | } |
370 | |
371 | /* |
372 | * Set the file system mounted on this block device. |
373 | */ |
374 | void |
375 | spec_node_setmountedfs(vnode_t *devvp, struct mount *mp) |
376 | { |
377 | |
378 | KASSERT(devvp->v_type == VBLK); |
379 | KASSERT(devvp->v_specnode->sn_dev->sd_mountpoint == NULL || mp == NULL); |
380 | devvp->v_specnode->sn_dev->sd_mountpoint = mp; |
381 | } |
382 | |
383 | /* |
384 | * A vnode representing a special device is going away. Close |
385 | * the device if the vnode holds it open. |
386 | */ |
387 | void |
388 | spec_node_revoke(vnode_t *vp) |
389 | { |
390 | specnode_t *sn; |
391 | specdev_t *sd; |
392 | |
393 | sn = vp->v_specnode; |
394 | sd = sn->sn_dev; |
395 | |
396 | KASSERT(vp->v_type == VBLK || vp->v_type == VCHR); |
397 | KASSERT(vp->v_specnode != NULL); |
398 | KASSERT(sn->sn_gone == false); |
399 | |
400 | mutex_enter(&device_lock); |
401 | KASSERT(sn->sn_opencnt <= sd->sd_opencnt); |
402 | if (sn->sn_opencnt != 0) { |
403 | sd->sd_opencnt -= (sn->sn_opencnt - 1); |
404 | sn->sn_opencnt = 1; |
405 | sn->sn_gone = true; |
406 | mutex_exit(&device_lock); |
407 | |
408 | VOP_CLOSE(vp, FNONBLOCK, NOCRED); |
409 | |
410 | mutex_enter(&device_lock); |
411 | KASSERT(sn->sn_opencnt == 0); |
412 | } |
413 | mutex_exit(&device_lock); |
414 | } |
415 | |
416 | /* |
417 | * A vnode representing a special device is being recycled. |
418 | * Destroy the specfs component. |
419 | */ |
420 | void |
421 | spec_node_destroy(vnode_t *vp) |
422 | { |
423 | specnode_t *sn; |
424 | specdev_t *sd; |
425 | vnode_t **vpp, *vp2; |
426 | int refcnt; |
427 | |
428 | sn = vp->v_specnode; |
429 | sd = sn->sn_dev; |
430 | |
431 | KASSERT(vp->v_type == VBLK || vp->v_type == VCHR); |
432 | KASSERT(vp->v_specnode != NULL); |
433 | KASSERT(sn->sn_opencnt == 0); |
434 | |
435 | mutex_enter(&device_lock); |
436 | /* Remove from the hash and destroy the node. */ |
437 | vpp = &specfs_hash[SPECHASH(vp->v_rdev)]; |
438 | for (vp2 = *vpp;; vp2 = vp2->v_specnext) { |
439 | if (vp2 == NULL) { |
440 | panic("spec_node_destroy: corrupt hash" ); |
441 | } |
442 | if (vp2 == vp) { |
443 | KASSERT(vp == *vpp); |
444 | *vpp = vp->v_specnext; |
445 | break; |
446 | } |
447 | if (vp2->v_specnext == vp) { |
448 | vp2->v_specnext = vp->v_specnext; |
449 | break; |
450 | } |
451 | } |
452 | sn = vp->v_specnode; |
453 | vp->v_specnode = NULL; |
454 | refcnt = sd->sd_refcnt--; |
455 | KASSERT(refcnt > 0); |
456 | mutex_exit(&device_lock); |
457 | |
458 | /* If the device is no longer in use, destroy our record. */ |
459 | if (refcnt == 1) { |
460 | KASSERT(sd->sd_opencnt == 0); |
461 | KASSERT(sd->sd_bdevvp == NULL); |
462 | kmem_free(sd, sizeof(*sd)); |
463 | } |
464 | kmem_free(sn, sizeof(*sn)); |
465 | } |
466 | |
467 | /* |
468 | * Trivial lookup routine that always fails. |
469 | */ |
470 | int |
471 | spec_lookup(void *v) |
472 | { |
473 | struct vop_lookup_v2_args /* { |
474 | struct vnode *a_dvp; |
475 | struct vnode **a_vpp; |
476 | struct componentname *a_cnp; |
477 | } */ *ap = v; |
478 | |
479 | *ap->a_vpp = NULL; |
480 | return (ENOTDIR); |
481 | } |
482 | |
483 | typedef int (*spec_ioctl_t)(dev_t, u_long, void *, int, struct lwp *); |
484 | |
485 | /* |
486 | * Open a special file. |
487 | */ |
488 | /* ARGSUSED */ |
489 | int |
490 | spec_open(void *v) |
491 | { |
492 | struct vop_open_args /* { |
493 | struct vnode *a_vp; |
494 | int a_mode; |
495 | kauth_cred_t a_cred; |
496 | } */ *ap = v; |
497 | struct lwp *l; |
498 | struct vnode *vp; |
499 | dev_t dev; |
500 | int error; |
501 | enum kauth_device_req req; |
502 | specnode_t *sn; |
503 | specdev_t *sd; |
504 | spec_ioctl_t ioctl; |
505 | u_int gen; |
506 | const char *name; |
507 | struct partinfo pi; |
508 | |
509 | l = curlwp; |
510 | vp = ap->a_vp; |
511 | dev = vp->v_rdev; |
512 | sn = vp->v_specnode; |
513 | sd = sn->sn_dev; |
514 | name = NULL; |
515 | gen = 0; |
516 | |
517 | /* |
518 | * Don't allow open if fs is mounted -nodev. |
519 | */ |
520 | if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV)) |
521 | return (ENXIO); |
522 | |
523 | switch (ap->a_mode & (FREAD | FWRITE)) { |
524 | case FREAD | FWRITE: |
525 | req = KAUTH_REQ_DEVICE_RAWIO_SPEC_RW; |
526 | break; |
527 | case FWRITE: |
528 | req = KAUTH_REQ_DEVICE_RAWIO_SPEC_WRITE; |
529 | break; |
530 | default: |
531 | req = KAUTH_REQ_DEVICE_RAWIO_SPEC_READ; |
532 | break; |
533 | } |
534 | |
535 | switch (vp->v_type) { |
536 | case VCHR: |
537 | error = kauth_authorize_device_spec(ap->a_cred, req, vp); |
538 | if (error != 0) |
539 | return (error); |
540 | |
541 | /* |
542 | * Character devices can accept opens from multiple |
543 | * vnodes. |
544 | */ |
545 | mutex_enter(&device_lock); |
546 | if (sn->sn_gone) { |
547 | mutex_exit(&device_lock); |
548 | return (EBADF); |
549 | } |
550 | sd->sd_opencnt++; |
551 | sn->sn_opencnt++; |
552 | mutex_exit(&device_lock); |
553 | if (cdev_type(dev) == D_TTY) |
554 | vp->v_vflag |= VV_ISTTY; |
555 | VOP_UNLOCK(vp); |
556 | do { |
557 | const struct cdevsw *cdev; |
558 | |
559 | gen = module_gen; |
560 | error = cdev_open(dev, ap->a_mode, S_IFCHR, l); |
561 | if (error != ENXIO) |
562 | break; |
563 | |
564 | /* Check if we already have a valid driver */ |
565 | mutex_enter(&device_lock); |
566 | cdev = cdevsw_lookup(dev); |
567 | mutex_exit(&device_lock); |
568 | if (cdev != NULL) |
569 | break; |
570 | |
571 | /* Get device name from devsw_conv array */ |
572 | if ((name = cdevsw_getname(major(dev))) == NULL) |
573 | break; |
574 | |
575 | /* Try to autoload device module */ |
576 | (void) module_autoload(name, MODULE_CLASS_DRIVER); |
577 | } while (gen != module_gen); |
578 | |
579 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
580 | break; |
581 | |
582 | case VBLK: |
583 | error = kauth_authorize_device_spec(ap->a_cred, req, vp); |
584 | if (error != 0) |
585 | return (error); |
586 | |
587 | /* |
588 | * For block devices, permit only one open. The buffer |
589 | * cache cannot remain self-consistent with multiple |
590 | * vnodes holding a block device open. |
591 | */ |
592 | mutex_enter(&device_lock); |
593 | if (sn->sn_gone) { |
594 | mutex_exit(&device_lock); |
595 | return (EBADF); |
596 | } |
597 | if (sd->sd_opencnt != 0) { |
598 | mutex_exit(&device_lock); |
599 | return EBUSY; |
600 | } |
601 | sn->sn_opencnt = 1; |
602 | sd->sd_opencnt = 1; |
603 | sd->sd_bdevvp = vp; |
604 | mutex_exit(&device_lock); |
605 | do { |
606 | const struct bdevsw *bdev; |
607 | |
608 | gen = module_gen; |
609 | error = bdev_open(dev, ap->a_mode, S_IFBLK, l); |
610 | if (error != ENXIO) |
611 | break; |
612 | |
613 | /* Check if we already have a valid driver */ |
614 | mutex_enter(&device_lock); |
615 | bdev = bdevsw_lookup(dev); |
616 | mutex_exit(&device_lock); |
617 | if (bdev != NULL) |
618 | break; |
619 | |
620 | /* Get device name from devsw_conv array */ |
621 | if ((name = bdevsw_getname(major(dev))) == NULL) |
622 | break; |
623 | |
624 | VOP_UNLOCK(vp); |
625 | |
626 | /* Try to autoload device module */ |
627 | (void) module_autoload(name, MODULE_CLASS_DRIVER); |
628 | |
629 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
630 | } while (gen != module_gen); |
631 | |
632 | break; |
633 | |
634 | case VNON: |
635 | case VLNK: |
636 | case VDIR: |
637 | case VREG: |
638 | case VBAD: |
639 | case VFIFO: |
640 | case VSOCK: |
641 | default: |
642 | return 0; |
643 | } |
644 | |
645 | mutex_enter(&device_lock); |
646 | if (sn->sn_gone) { |
647 | if (error == 0) |
648 | error = EBADF; |
649 | } else if (error != 0) { |
650 | sd->sd_opencnt--; |
651 | sn->sn_opencnt--; |
652 | if (vp->v_type == VBLK) |
653 | sd->sd_bdevvp = NULL; |
654 | |
655 | } |
656 | mutex_exit(&device_lock); |
657 | |
658 | if (cdev_type(dev) != D_DISK || error != 0) |
659 | return error; |
660 | |
661 | |
662 | ioctl = vp->v_type == VCHR ? cdev_ioctl : bdev_ioctl; |
663 | error = (*ioctl)(vp->v_rdev, DIOCGPARTINFO, &pi, FREAD, curlwp); |
664 | if (error == 0) |
665 | uvm_vnp_setsize(vp, (voff_t)pi.pi_secsize * pi.pi_size); |
666 | |
667 | return 0; |
668 | } |
669 | |
670 | /* |
671 | * Vnode op for read |
672 | */ |
673 | /* ARGSUSED */ |
674 | int |
675 | spec_read(void *v) |
676 | { |
677 | struct vop_read_args /* { |
678 | struct vnode *a_vp; |
679 | struct uio *a_uio; |
680 | int a_ioflag; |
681 | kauth_cred_t a_cred; |
682 | } */ *ap = v; |
683 | struct vnode *vp = ap->a_vp; |
684 | struct uio *uio = ap->a_uio; |
685 | struct lwp *l = curlwp; |
686 | struct buf *bp; |
687 | daddr_t bn; |
688 | int bsize, bscale; |
689 | struct partinfo pi; |
690 | int n, on; |
691 | int error = 0; |
692 | |
693 | KASSERT(uio->uio_rw == UIO_READ); |
694 | KASSERTMSG(VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || |
695 | uio->uio_vmspace == curproc->p_vmspace, |
696 | "vmspace belongs to neither kernel nor curproc" ); |
697 | |
698 | if (uio->uio_resid == 0) |
699 | return (0); |
700 | |
701 | switch (vp->v_type) { |
702 | |
703 | case VCHR: |
704 | VOP_UNLOCK(vp); |
705 | error = cdev_read(vp->v_rdev, uio, ap->a_ioflag); |
706 | vn_lock(vp, LK_SHARED | LK_RETRY); |
707 | return (error); |
708 | |
709 | case VBLK: |
710 | KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp); |
711 | if (uio->uio_offset < 0) |
712 | return (EINVAL); |
713 | |
714 | if (bdev_ioctl(vp->v_rdev, DIOCGPARTINFO, &pi, FREAD, l) == 0) |
715 | bsize = pi.pi_bsize; |
716 | else |
717 | bsize = BLKDEV_IOSIZE; |
718 | |
719 | bscale = bsize >> DEV_BSHIFT; |
720 | do { |
721 | bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1); |
722 | on = uio->uio_offset % bsize; |
723 | n = min((unsigned)(bsize - on), uio->uio_resid); |
724 | error = bread(vp, bn, bsize, 0, &bp); |
725 | if (error) { |
726 | return (error); |
727 | } |
728 | n = min(n, bsize - bp->b_resid); |
729 | error = uiomove((char *)bp->b_data + on, n, uio); |
730 | brelse(bp, 0); |
731 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
732 | return (error); |
733 | |
734 | default: |
735 | panic("spec_read type" ); |
736 | } |
737 | /* NOTREACHED */ |
738 | } |
739 | |
740 | /* |
741 | * Vnode op for write |
742 | */ |
743 | /* ARGSUSED */ |
744 | int |
745 | spec_write(void *v) |
746 | { |
747 | struct vop_write_args /* { |
748 | struct vnode *a_vp; |
749 | struct uio *a_uio; |
750 | int a_ioflag; |
751 | kauth_cred_t a_cred; |
752 | } */ *ap = v; |
753 | struct vnode *vp = ap->a_vp; |
754 | struct uio *uio = ap->a_uio; |
755 | struct lwp *l = curlwp; |
756 | struct buf *bp; |
757 | daddr_t bn; |
758 | int bsize, bscale; |
759 | struct partinfo pi; |
760 | int n, on; |
761 | int error = 0; |
762 | |
763 | KASSERT(uio->uio_rw == UIO_WRITE); |
764 | KASSERTMSG(VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || |
765 | uio->uio_vmspace == curproc->p_vmspace, |
766 | "vmspace belongs to neither kernel nor curproc" ); |
767 | |
768 | switch (vp->v_type) { |
769 | |
770 | case VCHR: |
771 | VOP_UNLOCK(vp); |
772 | error = cdev_write(vp->v_rdev, uio, ap->a_ioflag); |
773 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
774 | return (error); |
775 | |
776 | case VBLK: |
777 | KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp); |
778 | if (uio->uio_resid == 0) |
779 | return (0); |
780 | if (uio->uio_offset < 0) |
781 | return (EINVAL); |
782 | |
783 | if (bdev_ioctl(vp->v_rdev, DIOCGPARTINFO, &pi, FREAD, l) == 0) |
784 | bsize = pi.pi_bsize; |
785 | else |
786 | bsize = BLKDEV_IOSIZE; |
787 | |
788 | bscale = bsize >> DEV_BSHIFT; |
789 | do { |
790 | bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1); |
791 | on = uio->uio_offset % bsize; |
792 | n = min((unsigned)(bsize - on), uio->uio_resid); |
793 | if (n == bsize) |
794 | bp = getblk(vp, bn, bsize, 0, 0); |
795 | else |
796 | error = bread(vp, bn, bsize, B_MODIFY, &bp); |
797 | if (error) { |
798 | return (error); |
799 | } |
800 | n = min(n, bsize - bp->b_resid); |
801 | error = uiomove((char *)bp->b_data + on, n, uio); |
802 | if (error) |
803 | brelse(bp, 0); |
804 | else { |
805 | if (n + on == bsize) |
806 | bawrite(bp); |
807 | else |
808 | bdwrite(bp); |
809 | error = bp->b_error; |
810 | } |
811 | } while (error == 0 && uio->uio_resid > 0 && n != 0); |
812 | return (error); |
813 | |
814 | default: |
815 | panic("spec_write type" ); |
816 | } |
817 | /* NOTREACHED */ |
818 | } |
819 | |
820 | /* |
821 | * fdiscard, which on disk devices becomes TRIM. |
822 | */ |
823 | int |
824 | spec_fdiscard(void *v) |
825 | { |
826 | struct vop_fdiscard_args /* { |
827 | struct vnode *a_vp; |
828 | off_t a_pos; |
829 | off_t a_len; |
830 | } */ *ap = v; |
831 | struct vnode *vp; |
832 | dev_t dev; |
833 | |
834 | vp = ap->a_vp; |
835 | dev = NODEV; |
836 | |
837 | mutex_enter(vp->v_interlock); |
838 | if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode != NULL) { |
839 | dev = vp->v_rdev; |
840 | } |
841 | mutex_exit(vp->v_interlock); |
842 | |
843 | if (dev == NODEV) { |
844 | return ENXIO; |
845 | } |
846 | |
847 | switch (vp->v_type) { |
848 | case VCHR: |
849 | // this is not stored for character devices |
850 | //KASSERT(vp == vp->v_specnode->sn_dev->sd_cdevvp); |
851 | return cdev_discard(dev, ap->a_pos, ap->a_len); |
852 | case VBLK: |
853 | KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp); |
854 | return bdev_discard(dev, ap->a_pos, ap->a_len); |
855 | default: |
856 | panic("spec_fdiscard: not a device\n" ); |
857 | } |
858 | } |
859 | |
860 | /* |
861 | * Device ioctl operation. |
862 | */ |
863 | /* ARGSUSED */ |
864 | int |
865 | spec_ioctl(void *v) |
866 | { |
867 | struct vop_ioctl_args /* { |
868 | struct vnode *a_vp; |
869 | u_long a_command; |
870 | void *a_data; |
871 | int a_fflag; |
872 | kauth_cred_t a_cred; |
873 | } */ *ap = v; |
874 | struct vnode *vp; |
875 | dev_t dev; |
876 | |
877 | /* |
878 | * Extract all the info we need from the vnode, taking care to |
879 | * avoid a race with VOP_REVOKE(). |
880 | */ |
881 | |
882 | vp = ap->a_vp; |
883 | dev = NODEV; |
884 | mutex_enter(vp->v_interlock); |
885 | if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode) { |
886 | dev = vp->v_rdev; |
887 | } |
888 | mutex_exit(vp->v_interlock); |
889 | if (dev == NODEV) { |
890 | return ENXIO; |
891 | } |
892 | |
893 | switch (vp->v_type) { |
894 | |
895 | case VCHR: |
896 | return cdev_ioctl(dev, ap->a_command, ap->a_data, |
897 | ap->a_fflag, curlwp); |
898 | |
899 | case VBLK: |
900 | KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp); |
901 | return bdev_ioctl(dev, ap->a_command, ap->a_data, |
902 | ap->a_fflag, curlwp); |
903 | |
904 | default: |
905 | panic("spec_ioctl" ); |
906 | /* NOTREACHED */ |
907 | } |
908 | } |
909 | |
910 | /* ARGSUSED */ |
911 | int |
912 | spec_poll(void *v) |
913 | { |
914 | struct vop_poll_args /* { |
915 | struct vnode *a_vp; |
916 | int a_events; |
917 | } */ *ap = v; |
918 | struct vnode *vp; |
919 | dev_t dev; |
920 | |
921 | /* |
922 | * Extract all the info we need from the vnode, taking care to |
923 | * avoid a race with VOP_REVOKE(). |
924 | */ |
925 | |
926 | vp = ap->a_vp; |
927 | dev = NODEV; |
928 | mutex_enter(vp->v_interlock); |
929 | if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode) { |
930 | dev = vp->v_rdev; |
931 | } |
932 | mutex_exit(vp->v_interlock); |
933 | if (dev == NODEV) { |
934 | return POLLERR; |
935 | } |
936 | |
937 | switch (vp->v_type) { |
938 | |
939 | case VCHR: |
940 | return cdev_poll(dev, ap->a_events, curlwp); |
941 | |
942 | default: |
943 | return (genfs_poll(v)); |
944 | } |
945 | } |
946 | |
947 | /* ARGSUSED */ |
948 | int |
949 | spec_kqfilter(void *v) |
950 | { |
951 | struct vop_kqfilter_args /* { |
952 | struct vnode *a_vp; |
953 | struct proc *a_kn; |
954 | } */ *ap = v; |
955 | dev_t dev; |
956 | |
957 | switch (ap->a_vp->v_type) { |
958 | |
959 | case VCHR: |
960 | dev = ap->a_vp->v_rdev; |
961 | return cdev_kqfilter(dev, ap->a_kn); |
962 | default: |
963 | /* |
964 | * Block devices don't support kqfilter, and refuse it |
965 | * for any other files (like those vflush()ed) too. |
966 | */ |
967 | return (EOPNOTSUPP); |
968 | } |
969 | } |
970 | |
971 | /* |
972 | * Allow mapping of only D_DISK. This is called only for VBLK. |
973 | */ |
974 | int |
975 | spec_mmap(void *v) |
976 | { |
977 | struct vop_mmap_args /* { |
978 | struct vnode *a_vp; |
979 | vm_prot_t a_prot; |
980 | kauth_cred_t a_cred; |
981 | } */ *ap = v; |
982 | struct vnode *vp = ap->a_vp; |
983 | |
984 | KASSERT(vp->v_type == VBLK); |
985 | if (bdev_type(vp->v_rdev) != D_DISK) |
986 | return EINVAL; |
987 | |
988 | return 0; |
989 | } |
990 | |
991 | /* |
992 | * Synch buffers associated with a block device |
993 | */ |
994 | /* ARGSUSED */ |
995 | int |
996 | spec_fsync(void *v) |
997 | { |
998 | struct vop_fsync_args /* { |
999 | struct vnode *a_vp; |
1000 | kauth_cred_t a_cred; |
1001 | int a_flags; |
1002 | off_t offlo; |
1003 | off_t offhi; |
1004 | } */ *ap = v; |
1005 | struct vnode *vp = ap->a_vp; |
1006 | struct mount *mp; |
1007 | int error; |
1008 | |
1009 | if (vp->v_type == VBLK) { |
1010 | if ((mp = spec_node_getmountedfs(vp)) != NULL) { |
1011 | error = VFS_FSYNC(mp, vp, ap->a_flags); |
1012 | if (error != EOPNOTSUPP) |
1013 | return error; |
1014 | } |
1015 | return vflushbuf(vp, ap->a_flags); |
1016 | } |
1017 | return (0); |
1018 | } |
1019 | |
1020 | /* |
1021 | * Just call the device strategy routine |
1022 | */ |
1023 | int |
1024 | spec_strategy(void *v) |
1025 | { |
1026 | struct vop_strategy_args /* { |
1027 | struct vnode *a_vp; |
1028 | struct buf *a_bp; |
1029 | } */ *ap = v; |
1030 | struct vnode *vp = ap->a_vp; |
1031 | struct buf *bp = ap->a_bp; |
1032 | dev_t dev; |
1033 | int error; |
1034 | |
1035 | dev = NODEV; |
1036 | |
1037 | /* |
1038 | * Extract all the info we need from the vnode, taking care to |
1039 | * avoid a race with VOP_REVOKE(). |
1040 | */ |
1041 | |
1042 | mutex_enter(vp->v_interlock); |
1043 | if (vdead_check(vp, VDEAD_NOWAIT) == 0 && vp->v_specnode != NULL) { |
1044 | KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp); |
1045 | dev = vp->v_rdev; |
1046 | } |
1047 | mutex_exit(vp->v_interlock); |
1048 | |
1049 | if (dev == NODEV) { |
1050 | error = ENXIO; |
1051 | goto out; |
1052 | } |
1053 | bp->b_dev = dev; |
1054 | |
1055 | if (!(bp->b_flags & B_READ)) { |
1056 | error = fscow_run(bp, false); |
1057 | if (error) |
1058 | goto out; |
1059 | } |
1060 | bdev_strategy(bp); |
1061 | |
1062 | return 0; |
1063 | |
1064 | out: |
1065 | bp->b_error = error; |
1066 | bp->b_resid = bp->b_bcount; |
1067 | biodone(bp); |
1068 | |
1069 | return error; |
1070 | } |
1071 | |
1072 | int |
1073 | spec_inactive(void *v) |
1074 | { |
1075 | struct vop_inactive_args /* { |
1076 | struct vnode *a_vp; |
1077 | struct bool *a_recycle; |
1078 | } */ *ap = v; |
1079 | struct vnode *vp = ap->a_vp; |
1080 | |
1081 | KASSERT(vp->v_mount == dead_rootmount); |
1082 | *ap->a_recycle = true; |
1083 | VOP_UNLOCK(vp); |
1084 | return 0; |
1085 | } |
1086 | |
1087 | int |
1088 | spec_reclaim(void *v) |
1089 | { |
1090 | struct vop_reclaim_args /* { |
1091 | struct vnode *a_vp; |
1092 | } */ *ap = v; |
1093 | struct vnode *vp __diagused = ap->a_vp; |
1094 | |
1095 | KASSERT(vp->v_mount == dead_rootmount); |
1096 | return 0; |
1097 | } |
1098 | |
1099 | /* |
1100 | * This is a noop, simply returning what one has been given. |
1101 | */ |
1102 | int |
1103 | spec_bmap(void *v) |
1104 | { |
1105 | struct vop_bmap_args /* { |
1106 | struct vnode *a_vp; |
1107 | daddr_t a_bn; |
1108 | struct vnode **a_vpp; |
1109 | daddr_t *a_bnp; |
1110 | int *a_runp; |
1111 | } */ *ap = v; |
1112 | |
1113 | if (ap->a_vpp != NULL) |
1114 | *ap->a_vpp = ap->a_vp; |
1115 | if (ap->a_bnp != NULL) |
1116 | *ap->a_bnp = ap->a_bn; |
1117 | if (ap->a_runp != NULL) |
1118 | *ap->a_runp = (MAXBSIZE >> DEV_BSHIFT) - 1; |
1119 | return (0); |
1120 | } |
1121 | |
1122 | /* |
1123 | * Device close routine |
1124 | */ |
1125 | /* ARGSUSED */ |
1126 | int |
1127 | spec_close(void *v) |
1128 | { |
1129 | struct vop_close_args /* { |
1130 | struct vnode *a_vp; |
1131 | int a_fflag; |
1132 | kauth_cred_t a_cred; |
1133 | } */ *ap = v; |
1134 | struct vnode *vp = ap->a_vp; |
1135 | struct session *sess; |
1136 | dev_t dev = vp->v_rdev; |
1137 | int flags = ap->a_fflag; |
1138 | int mode, error, count; |
1139 | specnode_t *sn; |
1140 | specdev_t *sd; |
1141 | |
1142 | mutex_enter(vp->v_interlock); |
1143 | sn = vp->v_specnode; |
1144 | sd = sn->sn_dev; |
1145 | /* |
1146 | * If we're going away soon, make this non-blocking. |
1147 | * Also ensures that we won't wedge in vn_lock below. |
1148 | */ |
1149 | if (vdead_check(vp, VDEAD_NOWAIT) != 0) |
1150 | flags |= FNONBLOCK; |
1151 | mutex_exit(vp->v_interlock); |
1152 | |
1153 | switch (vp->v_type) { |
1154 | |
1155 | case VCHR: |
1156 | /* |
1157 | * Hack: a tty device that is a controlling terminal |
1158 | * has a reference from the session structure. We |
1159 | * cannot easily tell that a character device is a |
1160 | * controlling terminal, unless it is the closing |
1161 | * process' controlling terminal. In that case, if the |
1162 | * open count is 1 release the reference from the |
1163 | * session. Also, remove the link from the tty back to |
1164 | * the session and pgrp. |
1165 | * |
1166 | * XXX V. fishy. |
1167 | */ |
1168 | mutex_enter(proc_lock); |
1169 | sess = curlwp->l_proc->p_session; |
1170 | if (sn->sn_opencnt == 1 && vp == sess->s_ttyvp) { |
1171 | mutex_spin_enter(&tty_lock); |
1172 | sess->s_ttyvp = NULL; |
1173 | if (sess->s_ttyp->t_session != NULL) { |
1174 | sess->s_ttyp->t_pgrp = NULL; |
1175 | sess->s_ttyp->t_session = NULL; |
1176 | mutex_spin_exit(&tty_lock); |
1177 | /* Releases proc_lock. */ |
1178 | proc_sessrele(sess); |
1179 | } else { |
1180 | mutex_spin_exit(&tty_lock); |
1181 | if (sess->s_ttyp->t_pgrp != NULL) |
1182 | panic("spec_close: spurious pgrp ref" ); |
1183 | mutex_exit(proc_lock); |
1184 | } |
1185 | vrele(vp); |
1186 | } else |
1187 | mutex_exit(proc_lock); |
1188 | |
1189 | /* |
1190 | * If the vnode is locked, then we are in the midst |
1191 | * of forcably closing the device, otherwise we only |
1192 | * close on last reference. |
1193 | */ |
1194 | mode = S_IFCHR; |
1195 | break; |
1196 | |
1197 | case VBLK: |
1198 | KASSERT(vp == vp->v_specnode->sn_dev->sd_bdevvp); |
1199 | /* |
1200 | * On last close of a block device (that isn't mounted) |
1201 | * we must invalidate any in core blocks, so that |
1202 | * we can, for instance, change floppy disks. |
1203 | */ |
1204 | error = vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 0, 0); |
1205 | if (error) |
1206 | return (error); |
1207 | /* |
1208 | * We do not want to really close the device if it |
1209 | * is still in use unless we are trying to close it |
1210 | * forcibly. Since every use (buffer, vnode, swap, cmap) |
1211 | * holds a reference to the vnode, and because we mark |
1212 | * any other vnodes that alias this device, when the |
1213 | * sum of the reference counts on all the aliased |
1214 | * vnodes descends to one, we are on last close. |
1215 | */ |
1216 | mode = S_IFBLK; |
1217 | break; |
1218 | |
1219 | default: |
1220 | panic("spec_close: not special" ); |
1221 | } |
1222 | |
1223 | mutex_enter(&device_lock); |
1224 | sn->sn_opencnt--; |
1225 | count = --sd->sd_opencnt; |
1226 | if (vp->v_type == VBLK) |
1227 | sd->sd_bdevvp = NULL; |
1228 | mutex_exit(&device_lock); |
1229 | |
1230 | if (count != 0) |
1231 | return 0; |
1232 | |
1233 | /* |
1234 | * If we're able to block, release the vnode lock & reacquire. We |
1235 | * might end up sleeping for someone else who wants our queues. They |
1236 | * won't get them if we hold the vnode locked. |
1237 | */ |
1238 | if (!(flags & FNONBLOCK)) |
1239 | VOP_UNLOCK(vp); |
1240 | |
1241 | if (vp->v_type == VBLK) |
1242 | error = bdev_close(dev, flags, mode, curlwp); |
1243 | else |
1244 | error = cdev_close(dev, flags, mode, curlwp); |
1245 | |
1246 | if (!(flags & FNONBLOCK)) |
1247 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
1248 | |
1249 | return (error); |
1250 | } |
1251 | |
1252 | /* |
1253 | * Print out the contents of a special device vnode. |
1254 | */ |
1255 | int |
1256 | spec_print(void *v) |
1257 | { |
1258 | struct vop_print_args /* { |
1259 | struct vnode *a_vp; |
1260 | } */ *ap = v; |
1261 | |
1262 | printf("dev %llu, %llu\n" , (unsigned long long)major(ap->a_vp->v_rdev), |
1263 | (unsigned long long)minor(ap->a_vp->v_rdev)); |
1264 | return 0; |
1265 | } |
1266 | |
1267 | /* |
1268 | * Return POSIX pathconf information applicable to special devices. |
1269 | */ |
1270 | int |
1271 | spec_pathconf(void *v) |
1272 | { |
1273 | struct vop_pathconf_args /* { |
1274 | struct vnode *a_vp; |
1275 | int a_name; |
1276 | register_t *a_retval; |
1277 | } */ *ap = v; |
1278 | |
1279 | switch (ap->a_name) { |
1280 | case _PC_LINK_MAX: |
1281 | *ap->a_retval = LINK_MAX; |
1282 | return (0); |
1283 | case _PC_MAX_CANON: |
1284 | *ap->a_retval = MAX_CANON; |
1285 | return (0); |
1286 | case _PC_MAX_INPUT: |
1287 | *ap->a_retval = MAX_INPUT; |
1288 | return (0); |
1289 | case _PC_PIPE_BUF: |
1290 | *ap->a_retval = PIPE_BUF; |
1291 | return (0); |
1292 | case _PC_CHOWN_RESTRICTED: |
1293 | *ap->a_retval = 1; |
1294 | return (0); |
1295 | case _PC_VDISABLE: |
1296 | *ap->a_retval = _POSIX_VDISABLE; |
1297 | return (0); |
1298 | case _PC_SYNC_IO: |
1299 | *ap->a_retval = 1; |
1300 | return (0); |
1301 | default: |
1302 | return (EINVAL); |
1303 | } |
1304 | /* NOTREACHED */ |
1305 | } |
1306 | |
1307 | /* |
1308 | * Advisory record locking support. |
1309 | */ |
1310 | int |
1311 | spec_advlock(void *v) |
1312 | { |
1313 | struct vop_advlock_args /* { |
1314 | struct vnode *a_vp; |
1315 | void *a_id; |
1316 | int a_op; |
1317 | struct flock *a_fl; |
1318 | int a_flags; |
1319 | } */ *ap = v; |
1320 | struct vnode *vp = ap->a_vp; |
1321 | |
1322 | return lf_advlock(ap, &vp->v_speclockf, (off_t)0); |
1323 | } |
1324 | |