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devfs - Fix a few more issues
[dragonfly.git] / sys / vfs / devfs / devfs_vnops.c
blobf8550e1b4fbdf4dc0216d5e4cb4e405927c22753
1 /*
2 * (MPSAFE)
3 *
4 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
5 *
6 * This code is derived from software contributed to The DragonFly Project
7 * by Alex Hornung <ahornung@gmail.com>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/time.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/fcntl.h>
42 #include <sys/proc.h>
43 #include <sys/priv.h>
44 #include <sys/signalvar.h>
45 #include <sys/vnode.h>
46 #include <sys/uio.h>
47 #include <sys/mount.h>
48 #include <sys/file.h>
49 #include <sys/namei.h>
50 #include <sys/dirent.h>
51 #include <sys/malloc.h>
52 #include <sys/stat.h>
53 #include <sys/reg.h>
54 #include <vm/vm_pager.h>
55 #include <vm/vm_zone.h>
56 #include <vm/vm_object.h>
57 #include <sys/filio.h>
58 #include <sys/ttycom.h>
59 #include <sys/tty.h>
60 #include <sys/diskslice.h>
61 #include <sys/sysctl.h>
62 #include <sys/devfs.h>
63 #include <sys/pioctl.h>
64 #include <vfs/fifofs/fifo.h>
65
66 #include <machine/limits.h>
67
68 #include <sys/buf2.h>
69 #include <vm/vm_page2.h>
70
71 #ifndef SPEC_CHAIN_DEBUG
72 #define SPEC_CHAIN_DEBUG 0
73 #endif
74
75 MALLOC_DECLARE(M_DEVFS);
76 #define DEVFS_BADOP (void *)devfs_vop_badop
77
78 static int devfs_vop_badop(struct vop_generic_args *);
79 static int devfs_vop_access(struct vop_access_args *);
80 static int devfs_vop_inactive(struct vop_inactive_args *);
81 static int devfs_vop_reclaim(struct vop_reclaim_args *);
82 static int devfs_vop_readdir(struct vop_readdir_args *);
83 static int devfs_vop_getattr(struct vop_getattr_args *);
84 static int devfs_vop_setattr(struct vop_setattr_args *);
85 static int devfs_vop_readlink(struct vop_readlink_args *);
86 static int devfs_vop_print(struct vop_print_args *);
87
88 static int devfs_vop_nresolve(struct vop_nresolve_args *);
89 static int devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *);
90 static int devfs_vop_nmkdir(struct vop_nmkdir_args *);
91 static int devfs_vop_nsymlink(struct vop_nsymlink_args *);
92 static int devfs_vop_nrmdir(struct vop_nrmdir_args *);
93 static int devfs_vop_nremove(struct vop_nremove_args *);
94
95 static int devfs_spec_open(struct vop_open_args *);
96 static int devfs_spec_close(struct vop_close_args *);
97 static int devfs_spec_fsync(struct vop_fsync_args *);
98
99 static int devfs_spec_read(struct vop_read_args *);
100 static int devfs_spec_write(struct vop_write_args *);
101 static int devfs_spec_ioctl(struct vop_ioctl_args *);
102 static int devfs_spec_kqfilter(struct vop_kqfilter_args *);
103 static int devfs_spec_strategy(struct vop_strategy_args *);
104 static void devfs_spec_strategy_done(struct bio *);
105 static int devfs_spec_freeblks(struct vop_freeblks_args *);
106 static int devfs_spec_bmap(struct vop_bmap_args *);
107 static int devfs_spec_advlock(struct vop_advlock_args *);
108 static void devfs_spec_getpages_iodone(struct bio *);
109 static int devfs_spec_getpages(struct vop_getpages_args *);
110
111 static int devfs_fo_close(struct file *);
112 static int devfs_fo_read(struct file *, struct uio *, struct ucred *, int);
113 static int devfs_fo_write(struct file *, struct uio *, struct ucred *, int);
114 static int devfs_fo_stat(struct file *, struct stat *, struct ucred *);
115 static int devfs_fo_kqfilter(struct file *, struct knote *);
116 static int devfs_fo_ioctl(struct file *, u_long, caddr_t,
117 struct ucred *, struct sysmsg *);
118 static __inline int sequential_heuristic(struct uio *, struct file *);
119
120 extern struct lock devfs_lock;
121
122 /*
123 * devfs vnode operations for regular files. All vnode ops are MPSAFE.
124 */
125 struct vop_ops devfs_vnode_norm_vops = {
126 .vop_default = vop_defaultop,
127 .vop_access = devfs_vop_access,
128 .vop_advlock = DEVFS_BADOP,
129 .vop_bmap = DEVFS_BADOP,
130 .vop_close = vop_stdclose,
131 .vop_getattr = devfs_vop_getattr,
132 .vop_inactive = devfs_vop_inactive,
133 .vop_ncreate = DEVFS_BADOP,
134 .vop_nresolve = devfs_vop_nresolve,
135 .vop_nlookupdotdot = devfs_vop_nlookupdotdot,
136 .vop_nlink = DEVFS_BADOP,
137 .vop_nmkdir = devfs_vop_nmkdir,
138 .vop_nmknod = DEVFS_BADOP,
139 .vop_nremove = devfs_vop_nremove,
140 .vop_nrename = DEVFS_BADOP,
141 .vop_nrmdir = devfs_vop_nrmdir,
142 .vop_nsymlink = devfs_vop_nsymlink,
143 .vop_open = vop_stdopen,
144 .vop_pathconf = vop_stdpathconf,
145 .vop_print = devfs_vop_print,
146 .vop_read = DEVFS_BADOP,
147 .vop_readdir = devfs_vop_readdir,
148 .vop_readlink = devfs_vop_readlink,
149 .vop_reallocblks = DEVFS_BADOP,
150 .vop_reclaim = devfs_vop_reclaim,
151 .vop_setattr = devfs_vop_setattr,
152 .vop_write = DEVFS_BADOP,
153 .vop_ioctl = DEVFS_BADOP
154 };
155
156 /*
157 * devfs vnode operations for character devices. All vnode ops are MPSAFE.
158 */
159 struct vop_ops devfs_vnode_dev_vops = {
160 .vop_default = vop_defaultop,
161 .vop_access = devfs_vop_access,
162 .vop_advlock = devfs_spec_advlock,
163 .vop_bmap = devfs_spec_bmap,
164 .vop_close = devfs_spec_close,
165 .vop_freeblks = devfs_spec_freeblks,
166 .vop_fsync = devfs_spec_fsync,
167 .vop_getattr = devfs_vop_getattr,
168 .vop_getpages = devfs_spec_getpages,
169 .vop_inactive = devfs_vop_inactive,
170 .vop_open = devfs_spec_open,
171 .vop_pathconf = vop_stdpathconf,
172 .vop_print = devfs_vop_print,
173 .vop_kqfilter = devfs_spec_kqfilter,
174 .vop_read = devfs_spec_read,
175 .vop_readdir = DEVFS_BADOP,
176 .vop_readlink = DEVFS_BADOP,
177 .vop_reallocblks = DEVFS_BADOP,
178 .vop_reclaim = devfs_vop_reclaim,
179 .vop_setattr = devfs_vop_setattr,
180 .vop_strategy = devfs_spec_strategy,
181 .vop_write = devfs_spec_write,
182 .vop_ioctl = devfs_spec_ioctl
183 };
184
185 /*
186 * devfs file pointer operations. All fileops are MPSAFE.
187 */
188 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops;
189
190 struct fileops devfs_dev_fileops = {
191 .fo_read = devfs_fo_read,
192 .fo_write = devfs_fo_write,
193 .fo_ioctl = devfs_fo_ioctl,
194 .fo_kqfilter = devfs_fo_kqfilter,
195 .fo_stat = devfs_fo_stat,
196 .fo_close = devfs_fo_close,
197 .fo_shutdown = nofo_shutdown
198 };
199
200 /*
201 * These two functions are possibly temporary hacks for devices (aka
202 * the pty code) which want to control the node attributes themselves.
203 *
204 * XXX we may ultimately desire to simply remove the uid/gid/mode
205 * from the node entirely.
206 *
207 * MPSAFE - sorta. Theoretically the overwrite can compete since they
208 * are loading from the same fields.
209 */
210 static __inline void
211 node_sync_dev_get(struct devfs_node *node)
212 {
213 cdev_t dev;
214
215 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
216 node->uid = dev->si_uid;
217 node->gid = dev->si_gid;
218 node->mode = dev->si_perms;
219 }
220 }
221
222 static __inline void
223 node_sync_dev_set(struct devfs_node *node)
224 {
225 cdev_t dev;
226
227 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
228 dev->si_uid = node->uid;
229 dev->si_gid = node->gid;
230 dev->si_perms = node->mode;
231 }
232 }
233
234 /*
235 * generic entry point for unsupported operations
236 */
237 static int
238 devfs_vop_badop(struct vop_generic_args *ap)
239 {
240 return (EIO);
241 }
242
243
244 static int
245 devfs_vop_access(struct vop_access_args *ap)
246 {
247 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
248 int error;
249
250 if (!devfs_node_is_accessible(node))
251 return ENOENT;
252 node_sync_dev_get(node);
253 error = vop_helper_access(ap, node->uid, node->gid,
254 node->mode, node->flags);
255
256 return error;
257 }
258
259
260 static int
261 devfs_vop_inactive(struct vop_inactive_args *ap)
262 {
263 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
264
265 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0)
266 vrecycle(ap->a_vp);
267 return 0;
268 }
269
270
271 static int
272 devfs_vop_reclaim(struct vop_reclaim_args *ap)
273 {
274 struct devfs_node *node;
275 struct vnode *vp;
276 int locked;
277
278 /*
279 * Check if it is locked already. if not, we acquire the devfs lock
280 */
281 if ((lockstatus(&devfs_lock, curthread)) != LK_EXCLUSIVE) {
282 lockmgr(&devfs_lock, LK_EXCLUSIVE);
283 locked = 1;
284 } else {
285 locked = 0;
286 }
287
288 /*
289 * Get rid of the devfs_node if it is no longer linked into the
290 * topology. Interlocked by devfs_lock.
291 */
292 vp = ap->a_vp;
293 if ((node = DEVFS_NODE(vp)) != NULL) {
294 node->v_node = NULL;
295 if ((node->flags & DEVFS_NODE_LINKED) == 0)
296 devfs_freep(node);
297 }
298
299 if (locked)
300 lockmgr(&devfs_lock, LK_RELEASE);
301
302 /*
303 * v_rdev needs to be properly released using v_release_rdev
304 * Make sure v_data is NULL as well.
305 */
306 vp->v_data = NULL;
307 v_release_rdev(vp);
308 return 0;
309 }
310
311
312 static int
313 devfs_vop_readdir(struct vop_readdir_args *ap)
314 {
315 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp);
316 struct devfs_node *node;
317 int cookie_index;
318 int ncookies;
319 int error2;
320 int error;
321 int r;
322 off_t *cookies;
323 off_t saveoff;
324
325 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n");
326
327 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
328 return (EINVAL);
329 error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM);
330 if (error)
331 return (error);
332
333 if (!devfs_node_is_accessible(dnode)) {
334 vn_unlock(ap->a_vp);
335 return ENOENT;
336 }
337
338 lockmgr(&devfs_lock, LK_EXCLUSIVE);
339
340 saveoff = ap->a_uio->uio_offset;
341
342 if (ap->a_ncookies) {
343 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */
344 if (ncookies > 256)
345 ncookies = 256;
346 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK);
347 cookie_index = 0;
348 } else {
349 ncookies = -1;
350 cookies = NULL;
351 cookie_index = 0;
352 }
353
354 nanotime(&dnode->atime);
355
356 if (saveoff == 0) {
357 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino,
358 DT_DIR, 1, ".");
359 if (r)
360 goto done;
361 if (cookies)
362 cookies[cookie_index] = saveoff;
363 saveoff++;
364 cookie_index++;
365 if (cookie_index == ncookies)
366 goto done;
367 }
368
369 if (saveoff == 1) {
370 if (dnode->parent) {
371 r = vop_write_dirent(&error, ap->a_uio,
372 dnode->parent->d_dir.d_ino,
373 DT_DIR, 2, "..");
374 } else {
375 r = vop_write_dirent(&error, ap->a_uio,
376 dnode->d_dir.d_ino,
377 DT_DIR, 2, "..");
378 }
379 if (r)
380 goto done;
381 if (cookies)
382 cookies[cookie_index] = saveoff;
383 saveoff++;
384 cookie_index++;
385 if (cookie_index == ncookies)
386 goto done;
387 }
388
389 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
390 if ((node->flags & DEVFS_HIDDEN) ||
391 (node->flags & DEVFS_INVISIBLE)) {
392 continue;
393 }
394
395 /*
396 * If the node type is a valid devfs alias, then we make
397 * sure that the target isn't hidden. If it is, we don't
398 * show the link in the directory listing.
399 */
400 if ((node->node_type == Nlink) && (node->link_target != NULL) &&
401 (node->link_target->flags & DEVFS_HIDDEN))
402 continue;
403
404 if (node->cookie < saveoff)
405 continue;
406
407 saveoff = node->cookie;
408
409 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino,
410 node->d_dir.d_type,
411 node->d_dir.d_namlen,
412 node->d_dir.d_name);
413
414 if (error2)
415 break;
416
417 saveoff++;
418
419 if (cookies)
420 cookies[cookie_index] = node->cookie;
421 ++cookie_index;
422 if (cookie_index == ncookies)
423 break;
424 }
425
426 done:
427 lockmgr(&devfs_lock, LK_RELEASE);
428 vn_unlock(ap->a_vp);
429
430 ap->a_uio->uio_offset = saveoff;
431 if (error && cookie_index == 0) {
432 if (cookies) {
433 kfree(cookies, M_TEMP);
434 *ap->a_ncookies = 0;
435 *ap->a_cookies = NULL;
436 }
437 } else {
438 if (cookies) {
439 *ap->a_ncookies = cookie_index;
440 *ap->a_cookies = cookies;
441 }
442 }
443 return (error);
444 }
445
446
447 static int
448 devfs_vop_nresolve(struct vop_nresolve_args *ap)
449 {
450 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
451 struct devfs_node *node, *found = NULL;
452 struct namecache *ncp;
453 struct vnode *vp = NULL;
454 int error = 0;
455 int len;
456 int depth;
457
458 ncp = ap->a_nch->ncp;
459 len = ncp->nc_nlen;
460
461 if (!devfs_node_is_accessible(dnode))
462 return ENOENT;
463
464 lockmgr(&devfs_lock, LK_EXCLUSIVE);
465
466 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir)) {
467 error = ENOENT;
468 cache_setvp(ap->a_nch, NULL);
469 goto out;
470 }
471
472 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
473 if (len == node->d_dir.d_namlen) {
474 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) {
475 found = node;
476 break;
477 }
478 }
479 }
480
481 if (found) {
482 depth = 0;
483 while ((found->node_type == Nlink) && (found->link_target)) {
484 if (depth >= 8) {
485 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8");
486 break;
487 }
488
489 found = found->link_target;
490 ++depth;
491 }
492
493 if (!(found->flags & DEVFS_HIDDEN))
494 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp, found);
495 }
496
497 if (vp == NULL) {
498 error = ENOENT;
499 cache_setvp(ap->a_nch, NULL);
500 goto out;
501
502 }
503 KKASSERT(vp);
504 vn_unlock(vp);
505 cache_setvp(ap->a_nch, vp);
506 vrele(vp);
507 out:
508 lockmgr(&devfs_lock, LK_RELEASE);
509
510 return error;
511 }
512
513
514 static int
515 devfs_vop_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
516 {
517 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
518
519 *ap->a_vpp = NULL;
520 if (!devfs_node_is_accessible(dnode))
521 return ENOENT;
522
523 lockmgr(&devfs_lock, LK_EXCLUSIVE);
524 if (dnode->parent != NULL) {
525 devfs_allocv(ap->a_vpp, dnode->parent);
526 vn_unlock(*ap->a_vpp);
527 }
528 lockmgr(&devfs_lock, LK_RELEASE);
529
530 return ((*ap->a_vpp == NULL) ? ENOENT : 0);
531 }
532
533
534 /*
535 * getattr() - Does not need a lock since the vp is refd
536 */
537 static int
538 devfs_vop_getattr(struct vop_getattr_args *ap)
539 {
540 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
541 struct vattr *vap = ap->a_vap;
542 struct partinfo pinfo;
543 int error = 0;
544
545 #if 0
546 if (!devfs_node_is_accessible(node))
547 return ENOENT;
548 #endif
549
550 /*
551 * XXX This is a temporary hack to prevent crashes when the device is
552 * being destroyed (and so the underlying node will be gone) while
553 * a userland program is blocked in a read().
554 */
555 if (node == NULL)
556 return EIO;
557
558 node_sync_dev_get(node);
559
560 /* start by zeroing out the attributes */
561 VATTR_NULL(vap);
562
563 /* next do all the common fields */
564 vap->va_type = ap->a_vp->v_type;
565 vap->va_mode = node->mode;
566 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ;
567 vap->va_flags = 0;
568 vap->va_blocksize = DEV_BSIZE;
569 vap->va_bytes = vap->va_size = 0;
570
571 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
572
573 vap->va_atime = node->atime;
574 vap->va_mtime = node->mtime;
575 vap->va_ctime = node->ctime;
576
577 vap->va_nlink = 1; /* number of references to file */
578
579 vap->va_uid = node->uid;
580 vap->va_gid = node->gid;
581
582 vap->va_rmajor = 0;
583 vap->va_rminor = 0;
584
585 if ((node->node_type == Ndev) && node->d_dev) {
586 reference_dev(node->d_dev);
587 vap->va_rminor = node->d_dev->si_uminor;
588 release_dev(node->d_dev);
589 }
590
591 /* For a softlink the va_size is the length of the softlink */
592 if (node->symlink_name != 0) {
593 vap->va_bytes = vap->va_size = node->symlink_namelen;
594 }
595
596 /*
597 * For a disk-type device, va_size is the size of the underlying
598 * device, so that lseek() works properly.
599 */
600 if ((node->d_dev) && (dev_dflags(node->d_dev) & D_DISK)) {
601 bzero(&pinfo, sizeof(pinfo));
602 error = dev_dioctl(node->d_dev, DIOCGPART, (void *)&pinfo,
603 0, proc0.p_ucred, NULL, NULL);
604 if ((error == 0) && (pinfo.media_blksize != 0)) {
605 vap->va_size = pinfo.media_size;
606 } else {
607 vap->va_size = 0;
608 error = 0;
609 }
610 }
611
612 return (error);
613 }
614
615 static int
616 devfs_vop_setattr(struct vop_setattr_args *ap)
617 {
618 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
619 struct vattr *vap;
620 uid_t cur_uid;
621 gid_t cur_gid;
622 mode_t cur_mode;
623 int error = 0;
624
625 if (!devfs_node_is_accessible(node))
626 return ENOENT;
627 node_sync_dev_get(node);
628
629 lockmgr(&devfs_lock, LK_EXCLUSIVE);
630
631 vap = ap->a_vap;
632
633 if ((vap->va_uid != (uid_t)VNOVAL) || (vap->va_gid != (gid_t)VNOVAL)) {
634 cur_uid = node->uid;
635 cur_gid = node->gid;
636 cur_mode = node->mode;
637 error = vop_helper_chown(ap->a_vp, vap->va_uid, vap->va_gid,
638 ap->a_cred, &cur_uid, &cur_gid, &cur_mode);
639 if (error)
640 goto out;
641
642 if (node->uid != cur_uid || node->gid != cur_gid) {
643 node->uid = cur_uid;
644 node->gid = cur_gid;
645 node->mode = cur_mode;
646 }
647 }
648
649 if (vap->va_mode != (mode_t)VNOVAL) {
650 cur_mode = node->mode;
651 error = vop_helper_chmod(ap->a_vp, vap->va_mode, ap->a_cred,
652 node->uid, node->gid, &cur_mode);
653 if (error == 0 && node->mode != cur_mode) {
654 node->mode = cur_mode;
655 }
656 }
657
658 out:
659 node_sync_dev_set(node);
660 nanotime(&node->ctime);
661 lockmgr(&devfs_lock, LK_RELEASE);
662
663 return error;
664 }
665
666
667 static int
668 devfs_vop_readlink(struct vop_readlink_args *ap)
669 {
670 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
671 int ret;
672
673 if (!devfs_node_is_accessible(node))
674 return ENOENT;
675
676 lockmgr(&devfs_lock, LK_SHARED);
677 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio);
678 lockmgr(&devfs_lock, LK_RELEASE);
679
680 return ret;
681 }
682
683
684 static int
685 devfs_vop_print(struct vop_print_args *ap)
686 {
687 return (0);
688 }
689
690 static int
691 devfs_vop_nmkdir(struct vop_nmkdir_args *ap)
692 {
693 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
694 struct devfs_node *node;
695
696 if (!devfs_node_is_accessible(dnode))
697 return ENOENT;
698
699 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir))
700 goto out;
701
702 lockmgr(&devfs_lock, LK_EXCLUSIVE);
703 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Ndir,
704 ap->a_nch->ncp->nc_name, dnode, NULL);
705
706 if (*ap->a_vpp) {
707 node = DEVFS_NODE(*ap->a_vpp);
708 node->flags |= DEVFS_USER_CREATED;
709 cache_setunresolved(ap->a_nch);
710 cache_setvp(ap->a_nch, *ap->a_vpp);
711 }
712 lockmgr(&devfs_lock, LK_RELEASE);
713 out:
714 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
715 }
716
717 static int
718 devfs_vop_nsymlink(struct vop_nsymlink_args *ap)
719 {
720 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
721 struct devfs_node *node;
722 size_t targetlen;
723
724 if (!devfs_node_is_accessible(dnode))
725 return ENOENT;
726
727 ap->a_vap->va_type = VLNK;
728
729 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir))
730 goto out;
731
732 lockmgr(&devfs_lock, LK_EXCLUSIVE);
733 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Nlink,
734 ap->a_nch->ncp->nc_name, dnode, NULL);
735
736 targetlen = strlen(ap->a_target);
737 if (*ap->a_vpp) {
738 node = DEVFS_NODE(*ap->a_vpp);
739 node->flags |= DEVFS_USER_CREATED;
740 node->symlink_namelen = targetlen;
741 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK);
742 memcpy(node->symlink_name, ap->a_target, targetlen);
743 node->symlink_name[targetlen] = '\0';
744 cache_setunresolved(ap->a_nch);
745 cache_setvp(ap->a_nch, *ap->a_vpp);
746 }
747 lockmgr(&devfs_lock, LK_RELEASE);
748 out:
749 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
750 }
751
752 static int
753 devfs_vop_nrmdir(struct vop_nrmdir_args *ap)
754 {
755 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
756 struct devfs_node *node;
757 struct namecache *ncp;
758 int error = ENOENT;
759
760 ncp = ap->a_nch->ncp;
761
762 if (!devfs_node_is_accessible(dnode))
763 return ENOENT;
764
765 lockmgr(&devfs_lock, LK_EXCLUSIVE);
766
767 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir))
768 goto out;
769
770 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
771 if (ncp->nc_nlen != node->d_dir.d_namlen)
772 continue;
773 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen))
774 continue;
775
776 /*
777 * only allow removal of user created dirs
778 */
779 if ((node->flags & DEVFS_USER_CREATED) == 0) {
780 error = EPERM;
781 goto out;
782 } else if (node->node_type != Ndir) {
783 error = ENOTDIR;
784 goto out;
785 } else if (node->nchildren > 2) {
786 error = ENOTEMPTY;
787 goto out;
788 } else {
789 if (node->v_node)
790 cache_inval_vp(node->v_node, CINV_DESTROY);
791 devfs_unlinkp(node);
792 error = 0;
793 break;
794 }
795 }
796
797 cache_unlink(ap->a_nch);
798 out:
799 lockmgr(&devfs_lock, LK_RELEASE);
800 return error;
801 }
802
803 static int
804 devfs_vop_nremove(struct vop_nremove_args *ap)
805 {
806 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
807 struct devfs_node *node;
808 struct namecache *ncp;
809 int error = ENOENT;
810
811 ncp = ap->a_nch->ncp;
812
813 if (!devfs_node_is_accessible(dnode))
814 return ENOENT;
815
816 lockmgr(&devfs_lock, LK_EXCLUSIVE);
817
818 if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir))
819 goto out;
820
821 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
822 if (ncp->nc_nlen != node->d_dir.d_namlen)
823 continue;
824 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen))
825 continue;
826
827 /*
828 * only allow removal of user created stuff (e.g. symlinks)
829 */
830 if ((node->flags & DEVFS_USER_CREATED) == 0) {
831 error = EPERM;
832 goto out;
833 } else if (node->node_type == Ndir) {
834 error = EISDIR;
835 goto out;
836 } else {
837 if (node->v_node)
838 cache_inval_vp(node->v_node, CINV_DESTROY);
839 devfs_unlinkp(node);
840 error = 0;
841 break;
842 }
843 }
844
845 cache_unlink(ap->a_nch);
846 out:
847 lockmgr(&devfs_lock, LK_RELEASE);
848 return error;
849 }
850
851
852 static int
853 devfs_spec_open(struct vop_open_args *ap)
854 {
855 struct vnode *vp = ap->a_vp;
856 struct vnode *orig_vp = NULL;
857 struct devfs_node *node = DEVFS_NODE(vp);
858 struct devfs_node *newnode;
859 cdev_t dev, ndev = NULL;
860 int error = 0;
861
862 if (node) {
863 if (node->d_dev == NULL)
864 return ENXIO;
865 if (!devfs_node_is_accessible(node))
866 return ENOENT;
867 }
868
869 if ((dev = vp->v_rdev) == NULL)
870 return ENXIO;
871
872 /*
873 * Simple devices that don't care. Retain the shared lock.
874 */
875 if (dev_dflags(dev) & D_QUICK) {
876 vn_unlock(vp);
877 error = dev_dopen(dev, ap->a_mode, S_IFCHR,
878 ap->a_cred, ap->a_fp);
879 vn_lock(vp, LK_SHARED | LK_RETRY);
880 vop_stdopen(ap);
881 goto skip;
882 }
883
884 /*
885 * Slow code
886 */
887 vn_lock(vp, LK_UPGRADE | LK_RETRY);
888 if (node && ap->a_fp) {
889 int exists;
890
891 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n");
892 lockmgr(&devfs_lock, LK_EXCLUSIVE);
893
894 ndev = devfs_clone(dev, node->d_dir.d_name,
895 node->d_dir.d_namlen,
896 ap->a_mode, ap->a_cred);
897 if (ndev != NULL) {
898 newnode = devfs_create_device_node(
899 DEVFS_MNTDATA(vp->v_mount)->root_node,
900 ndev, &exists, NULL, NULL);
901 /* XXX: possibly destroy device if this happens */
902
903 if (newnode != NULL) {
904 dev = ndev;
905 if (exists == 0)
906 devfs_link_dev(dev);
907
908 devfs_debug(DEVFS_DEBUG_DEBUG,
909 "parent here is: %s, node is: |%s|\n",
910 ((node->parent->node_type == Nroot) ?
911 "ROOT!" : node->parent->d_dir.d_name),
912 newnode->d_dir.d_name);
913 devfs_debug(DEVFS_DEBUG_DEBUG,
914 "test: %s\n",
915 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name);
916
917 /*
918 * orig_vp is set to the original vp if we
919 * cloned.
920 */
921 /* node->flags |= DEVFS_CLONED; */
922 devfs_allocv(&vp, newnode);
923 orig_vp = ap->a_vp;
924 ap->a_vp = vp;
925 }
926 }
927 lockmgr(&devfs_lock, LK_RELEASE);
928
929 /*
930 * Synchronize devfs here to make sure that, if the cloned
931 * device creates other device nodes in addition to the
932 * cloned one, all of them are created by the time we return
933 * from opening the cloned one.
934 */
935 if (ndev)
936 devfs_config();
937 }
938
939 devfs_debug(DEVFS_DEBUG_DEBUG,
940 "devfs_spec_open() called on %s! \n",
941 dev->si_name);
942
943 /*
944 * Make this field valid before any I/O in ->d_open
945 *
946 * NOTE: Shared vnode lock probably held, but its ok as long
947 * as assignments are consistent.
948 */
949 if (!dev->si_iosize_max)
950 /* XXX: old DFLTPHYS == 64KB dependency */
951 dev->si_iosize_max = min(MAXPHYS,64*1024);
952
953 if (dev_dflags(dev) & D_TTY)
954 vsetflags(vp, VISTTY);
955
956 /*
957 * Open the underlying device
958 */
959 vn_unlock(vp);
960 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred, ap->a_fp);
961 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
962
963 /*
964 * Clean up any cloned vp if we error out.
965 */
966 if (error) {
967 if (orig_vp) {
968 vput(vp);
969 ap->a_vp = orig_vp;
970 /* orig_vp = NULL; */
971 }
972 return error;
973 }
974
975 /*
976 * This checks if the disk device is going to be opened for writing.
977 * It will be only allowed in the cases where securelevel permits it
978 * and it's not mounted R/W.
979 */
980 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) &&
981 (ap->a_cred != FSCRED)) {
982
983 /* Very secure mode. No open for writing allowed */
984 if (securelevel >= 2)
985 return EPERM;
986
987 /*
988 * If it is mounted R/W, do not allow to open for writing.
989 * In the case it's mounted read-only but securelevel
990 * is >= 1, then do not allow opening for writing either.
991 */
992 if (vfs_mountedon(vp)) {
993 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY))
994 return EBUSY;
995 else if (securelevel >= 1)
996 return EPERM;
997 }
998 }
999
1000 /*
1001 * NOTE: vnode is still locked shared. t_stop assignment should
1002 * remain consistent so we should be ok.
1003 */
1004 if (dev_dflags(dev) & D_TTY) {
1005 if (dev->si_tty) {
1006 struct tty *tp;
1007 tp = dev->si_tty;
1008 if (!tp->t_stop) {
1009 devfs_debug(DEVFS_DEBUG_DEBUG,
1010 "devfs: no t_stop\n");
1011 tp->t_stop = nottystop;
1012 }
1013 }
1014 }
1015
1016 /*
1017 * NOTE: vnode is still locked shared. assignments should
1018 * remain consistent so we should be ok. However,
1019 * upgrade to exclusive if we need a VM object.
1020 */
1021 if (vn_isdisk(vp, NULL)) {
1022 if (!dev->si_bsize_phys)
1023 dev->si_bsize_phys = DEV_BSIZE;
1024 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1);
1025 }
1026
1027 vop_stdopen(ap);
1028 #if 0
1029 if (node)
1030 nanotime(&node->atime);
1031 #endif
1032 /*
1033 * If we replaced the vp the vop_stdopen() call will have loaded
1034 * it into fp->f_data and vref()d the vp, giving us two refs. So
1035 * instead of just unlocking it here we have to vput() it.
1036 */
1037 if (orig_vp)
1038 vput(vp);
1039
1040 /* Ugly pty magic, to make pty devices appear once they are opened */
1041 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) {
1042 if (node->flags & DEVFS_INVISIBLE)
1043 node->flags &= ~DEVFS_INVISIBLE;
1044 }
1045
1046 skip:
1047 if (ap->a_fp) {
1048 KKASSERT(ap->a_fp->f_type == DTYPE_VNODE);
1049 KKASSERT((ap->a_fp->f_flag & FMASK) == (ap->a_mode & FMASK));
1050 ap->a_fp->f_ops = &devfs_dev_fileops;
1051 KKASSERT(ap->a_fp->f_data == (void *)vp);
1052 }
1053
1054 return 0;
1055 }
1056
1057 static int
1058 devfs_spec_close(struct vop_close_args *ap)
1059 {
1060 struct devfs_node *node;
1061 struct proc *p = curproc;
1062 struct vnode *vp = ap->a_vp;
1063 cdev_t dev = vp->v_rdev;
1064 int error = 0;
1065 int needrelock;
1066 int opencount;
1067
1068 /*
1069 * Devices flagged D_QUICK require no special handling.
1070 */
1071 if (dev && dev_dflags(dev) & D_QUICK) {
1072 opencount = vp->v_opencount;
1073 if (opencount <= 1)
1074 opencount = count_dev(dev); /* XXX NOT SMP SAFE */
1075 if (((vp->v_flag & VRECLAIMED) ||
1076 (dev_dflags(dev) & D_TRACKCLOSE) ||
1077 (opencount == 1))) {
1078 vn_unlock(vp);
1079 error = dev_dclose(dev, ap->a_fflag, S_IFCHR, ap->a_fp);
1080 vn_lock(vp, LK_SHARED | LK_RETRY);
1081 }
1082 goto skip;
1083 }
1084
1085 /*
1086 * We do special tests on the opencount so unfortunately we need
1087 * an exclusive lock.
1088 */
1089 vn_lock(vp, LK_UPGRADE | LK_RETRY);
1090
1091 if (dev)
1092 devfs_debug(DEVFS_DEBUG_DEBUG,
1093 "devfs_spec_close() called on %s! \n",
1094 dev->si_name);
1095 else
1096 devfs_debug(DEVFS_DEBUG_DEBUG,
1097 "devfs_spec_close() called, null vode!\n");
1098
1099 /*
1100 * A couple of hacks for devices and tty devices. The
1101 * vnode ref count cannot be used to figure out the
1102 * last close, but we can use v_opencount now that
1103 * revoke works properly.
1104 *
1105 * Detect the last close on a controlling terminal and clear
1106 * the session (half-close).
1107 *
1108 * XXX opencount is not SMP safe. The vnode is locked but there
1109 * may be multiple vnodes referencing the same device.
1110 */
1111 if (dev) {
1112 /*
1113 * NOTE: Try to avoid global tokens when testing opencount
1114 * XXX hack, fixme. needs a struct lock and opencount in
1115 * struct cdev itself.
1116 */
1117 reference_dev(dev);
1118 opencount = vp->v_opencount;
1119 if (opencount <= 1)
1120 opencount = count_dev(dev); /* XXX NOT SMP SAFE */
1121 } else {
1122 opencount = 0;
1123 }
1124
1125 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) {
1126 p->p_session->s_ttyvp = NULL;
1127 vrele(vp);
1128 }
1129
1130 /*
1131 * Vnodes can be opened and closed multiple times. Do not really
1132 * close the device unless (1) it is being closed forcibly,
1133 * (2) the device wants to track closes, or (3) this is the last
1134 * vnode doing its last close on the device.
1135 *
1136 * XXX the VXLOCK (force close) case can leave vnodes referencing
1137 * a closed device. This might not occur now that our revoke is
1138 * fixed.
1139 */
1140 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n");
1141 if (dev && ((vp->v_flag & VRECLAIMED) ||
1142 (dev_dflags(dev) & D_TRACKCLOSE) ||
1143 (opencount == 1))) {
1144 /*
1145 * Ugly pty magic, to make pty devices disappear again once
1146 * they are closed.
1147 */
1148 node = DEVFS_NODE(ap->a_vp);
1149 if (node && (node->flags & DEVFS_PTY))
1150 node->flags |= DEVFS_INVISIBLE;
1151
1152 /*
1153 * Unlock around dev_dclose(), unless the vnode is
1154 * undergoing a vgone/reclaim (during umount).
1155 */
1156 needrelock = 0;
1157 if ((vp->v_flag & VRECLAIMED) == 0 && vn_islocked(vp)) {
1158 needrelock = 1;
1159 vn_unlock(vp);
1160 }
1161
1162 /*
1163 * WARNING! If the device destroys itself the devfs node
1164 * can disappear here.
1165 *
1166 * WARNING! vn_lock() will fail if the vp is in a VRECLAIM,
1167 * which can occur during umount.
1168 */
1169 error = dev_dclose(dev, ap->a_fflag, S_IFCHR, ap->a_fp);
1170 /* node is now stale */
1171
1172 if (needrelock) {
1173 if (vn_lock(vp, LK_EXCLUSIVE |
1174 LK_RETRY |
1175 LK_FAILRECLAIM) != 0) {
1176 panic("devfs_spec_close: vnode %p "
1177 "unexpectedly could not be relocked",
1178 vp);
1179 }
1180 }
1181 } else {
1182 error = 0;
1183 }
1184 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n");
1185
1186 /*
1187 * Track the actual opens and closes on the vnode. The last close
1188 * disassociates the rdev. If the rdev is already disassociated or
1189 * the opencount is already 0, the vnode might have been revoked
1190 * and no further opencount tracking occurs.
1191 */
1192 if (dev)
1193 release_dev(dev);
1194 skip:
1195 if (vp->v_opencount > 0)
1196 vop_stdclose(ap);
1197 return(error);
1198
1199 }
1200
1201
1202 static int
1203 devfs_fo_close(struct file *fp)
1204 {
1205 struct vnode *vp = (struct vnode *)fp->f_data;
1206 int error;
1207
1208 fp->f_ops = &badfileops;
1209 error = vn_close(vp, fp->f_flag, fp);
1210 devfs_clear_cdevpriv(fp);
1211
1212 return (error);
1213 }
1214
1215
1216 /*
1217 * Device-optimized file table vnode read routine.
1218 *
1219 * This bypasses the VOP table and talks directly to the device. Most
1220 * filesystems just route to specfs and can make this optimization.
1221 */
1222 static int
1223 devfs_fo_read(struct file *fp, struct uio *uio,
1224 struct ucred *cred, int flags)
1225 {
1226 struct devfs_node *node;
1227 struct vnode *vp;
1228 int ioflag;
1229 int error;
1230 cdev_t dev;
1231
1232 KASSERT(uio->uio_td == curthread,
1233 ("uio_td %p is not td %p", uio->uio_td, curthread));
1234
1235 if (uio->uio_resid == 0)
1236 return 0;
1237
1238 vp = (struct vnode *)fp->f_data;
1239 if (vp == NULL || vp->v_type == VBAD)
1240 return EBADF;
1241
1242 node = DEVFS_NODE(vp);
1243
1244 if ((dev = vp->v_rdev) == NULL)
1245 return EBADF;
1246
1247 reference_dev(dev);
1248
1249 if ((flags & O_FOFFSET) == 0)
1250 uio->uio_offset = fp->f_offset;
1251
1252 ioflag = 0;
1253 if (flags & O_FBLOCKING) {
1254 /* ioflag &= ~IO_NDELAY; */
1255 } else if (flags & O_FNONBLOCKING) {
1256 ioflag |= IO_NDELAY;
1257 } else if (fp->f_flag & FNONBLOCK) {
1258 ioflag |= IO_NDELAY;
1259 }
1260 if (fp->f_flag & O_DIRECT) {
1261 ioflag |= IO_DIRECT;
1262 }
1263 ioflag |= sequential_heuristic(uio, fp);
1264
1265 error = dev_dread(dev, uio, ioflag, fp);
1266
1267 release_dev(dev);
1268 if (node)
1269 nanotime(&node->atime);
1270 if ((flags & O_FOFFSET) == 0)
1271 fp->f_offset = uio->uio_offset;
1272 fp->f_nextoff = uio->uio_offset;
1273
1274 return (error);
1275 }
1276
1277
1278 static int
1279 devfs_fo_write(struct file *fp, struct uio *uio,
1280 struct ucred *cred, int flags)
1281 {
1282 struct devfs_node *node;
1283 struct vnode *vp;
1284 int ioflag;
1285 int error;
1286 cdev_t dev;
1287
1288 KASSERT(uio->uio_td == curthread,
1289 ("uio_td %p is not p %p", uio->uio_td, curthread));
1290
1291 vp = (struct vnode *)fp->f_data;
1292 if (vp == NULL || vp->v_type == VBAD)
1293 return EBADF;
1294
1295 node = DEVFS_NODE(vp);
1296
1297 if (vp->v_type == VREG)
1298 bwillwrite(uio->uio_resid);
1299
1300 vp = (struct vnode *)fp->f_data;
1301
1302 if ((dev = vp->v_rdev) == NULL)
1303 return EBADF;
1304
1305 reference_dev(dev);
1306
1307 if ((flags & O_FOFFSET) == 0)
1308 uio->uio_offset = fp->f_offset;
1309
1310 ioflag = IO_UNIT;
1311 if (vp->v_type == VREG &&
1312 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
1313 ioflag |= IO_APPEND;
1314 }
1315
1316 if (flags & O_FBLOCKING) {
1317 /* ioflag &= ~IO_NDELAY; */
1318 } else if (flags & O_FNONBLOCKING) {
1319 ioflag |= IO_NDELAY;
1320 } else if (fp->f_flag & FNONBLOCK) {
1321 ioflag |= IO_NDELAY;
1322 }
1323 if (fp->f_flag & O_DIRECT) {
1324 ioflag |= IO_DIRECT;
1325 }
1326 if (flags & O_FASYNCWRITE) {
1327 /* ioflag &= ~IO_SYNC; */
1328 } else if (flags & O_FSYNCWRITE) {
1329 ioflag |= IO_SYNC;
1330 } else if (fp->f_flag & O_FSYNC) {
1331 ioflag |= IO_SYNC;
1332 }
1333
1334 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
1335 ioflag |= IO_SYNC;
1336 ioflag |= sequential_heuristic(uio, fp);
1337
1338 error = dev_dwrite(dev, uio, ioflag, fp);
1339
1340 release_dev(dev);
1341 if (node) {
1342 nanotime(&node->atime);
1343 nanotime(&node->mtime);
1344 }
1345
1346 if ((flags & O_FOFFSET) == 0)
1347 fp->f_offset = uio->uio_offset;
1348 fp->f_nextoff = uio->uio_offset;
1349
1350 return (error);
1351 }
1352
1353
1354 static int
1355 devfs_fo_stat(struct file *fp, struct stat *sb, struct ucred *cred)
1356 {
1357 struct vnode *vp;
1358 struct vattr vattr;
1359 struct vattr *vap;
1360 u_short mode;
1361 cdev_t dev;
1362 int error;
1363
1364 vp = (struct vnode *)fp->f_data;
1365 if (vp == NULL || vp->v_type == VBAD)
1366 return EBADF;
1367
1368 error = vn_stat(vp, sb, cred);
1369 if (error)
1370 return (error);
1371
1372 vap = &vattr;
1373 error = VOP_GETATTR(vp, vap);
1374 if (error)
1375 return (error);
1376
1377 /*
1378 * Zero the spare stat fields
1379 */
1380 sb->st_lspare = 0;
1381 sb->st_qspare1 = 0;
1382 sb->st_qspare2 = 0;
1383
1384 /*
1385 * Copy from vattr table ... or not in case it's a cloned device
1386 */
1387 if (vap->va_fsid != VNOVAL)
1388 sb->st_dev = vap->va_fsid;
1389 else
1390 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1391
1392 sb->st_ino = vap->va_fileid;
1393
1394 mode = vap->va_mode;
1395 mode |= S_IFCHR;
1396 sb->st_mode = mode;
1397
1398 if (vap->va_nlink > (nlink_t)-1)
1399 sb->st_nlink = (nlink_t)-1;
1400 else
1401 sb->st_nlink = vap->va_nlink;
1402
1403 sb->st_uid = vap->va_uid;
1404 sb->st_gid = vap->va_gid;
1405 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev);
1406 sb->st_size = vap->va_bytes;
1407 sb->st_atimespec = vap->va_atime;
1408 sb->st_mtimespec = vap->va_mtime;
1409 sb->st_ctimespec = vap->va_ctime;
1410
1411 /*
1412 * A VCHR and VBLK device may track the last access and last modified
1413 * time independantly of the filesystem. This is particularly true
1414 * because device read and write calls may bypass the filesystem.
1415 */
1416 if (vp->v_type == VCHR || vp->v_type == VBLK) {
1417 dev = vp->v_rdev;
1418 if (dev != NULL) {
1419 if (dev->si_lastread) {
1420 sb->st_atimespec.tv_sec = time_second +
1421 (time_uptime -
1422 dev->si_lastread);
1423 sb->st_atimespec.tv_nsec = 0;
1424 }
1425 if (dev->si_lastwrite) {
1426 sb->st_atimespec.tv_sec = time_second +
1427 (time_uptime -
1428 dev->si_lastwrite);
1429 sb->st_atimespec.tv_nsec = 0;
1430 }
1431 }
1432 }
1433
1434 /*
1435 * According to www.opengroup.org, the meaning of st_blksize is
1436 * "a filesystem-specific preferred I/O block size for this
1437 * object. In some filesystem types, this may vary from file
1438 * to file"
1439 * Default to PAGE_SIZE after much discussion.
1440 */
1441
1442 sb->st_blksize = PAGE_SIZE;
1443
1444 sb->st_flags = vap->va_flags;
1445
1446 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
1447 if (error)
1448 sb->st_gen = 0;
1449 else
1450 sb->st_gen = (u_int32_t)vap->va_gen;
1451
1452 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1453
1454 return (0);
1455 }
1456
1457
1458 static int
1459 devfs_fo_kqfilter(struct file *fp, struct knote *kn)
1460 {
1461 struct vnode *vp;
1462 int error;
1463 cdev_t dev;
1464
1465 vp = (struct vnode *)fp->f_data;
1466 if (vp == NULL || vp->v_type == VBAD) {
1467 error = EBADF;
1468 goto done;
1469 }
1470 if ((dev = vp->v_rdev) == NULL) {
1471 error = EBADF;
1472 goto done;
1473 }
1474 reference_dev(dev);
1475
1476 error = dev_dkqfilter(dev, kn, fp);
1477
1478 release_dev(dev);
1479
1480 done:
1481 return (error);
1482 }
1483
1484 static int
1485 devfs_fo_ioctl(struct file *fp, u_long com, caddr_t data,
1486 struct ucred *ucred, struct sysmsg *msg)
1487 {
1488 #if 0
1489 struct devfs_node *node;
1490 #endif
1491 struct vnode *vp;
1492 struct vnode *ovp;
1493 cdev_t dev;
1494 int error;
1495 struct fiodname_args *name_args;
1496 size_t namlen;
1497 const char *name;
1498
1499 vp = ((struct vnode *)fp->f_data);
1500
1501 if ((dev = vp->v_rdev) == NULL)
1502 return EBADF; /* device was revoked */
1503
1504 reference_dev(dev);
1505
1506 #if 0
1507 node = DEVFS_NODE(vp);
1508 #endif
1509
1510 devfs_debug(DEVFS_DEBUG_DEBUG,
1511 "devfs_fo_ioctl() called! for dev %s\n",
1512 dev->si_name);
1513
1514 if (com == FIODTYPE) {
1515 *(int *)data = dev_dflags(dev) & D_TYPEMASK;
1516 error = 0;
1517 goto out;
1518 } else if (com == FIODNAME) {
1519 name_args = (struct fiodname_args *)data;
1520 name = dev->si_name;
1521 namlen = strlen(name) + 1;
1522
1523 devfs_debug(DEVFS_DEBUG_DEBUG,
1524 "ioctl, got: FIODNAME for %s\n", name);
1525
1526 if (namlen <= name_args->len)
1527 error = copyout(dev->si_name, name_args->name, namlen);
1528 else
1529 error = EINVAL;
1530
1531 devfs_debug(DEVFS_DEBUG_DEBUG,
1532 "ioctl stuff: error: %d\n", error);
1533 goto out;
1534 }
1535
1536 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg, fp);
1537
1538 #if 0
1539 if (node) {
1540 nanotime(&node->atime);
1541 nanotime(&node->mtime);
1542 }
1543 #endif
1544 if (com == TIOCSCTTY) {
1545 devfs_debug(DEVFS_DEBUG_DEBUG,
1546 "devfs_fo_ioctl: got TIOCSCTTY on %s\n",
1547 dev->si_name);
1548 }
1549 if (error == 0 && com == TIOCSCTTY) {
1550 struct proc *p = curthread->td_proc;
1551 struct session *sess;
1552
1553 devfs_debug(DEVFS_DEBUG_DEBUG,
1554 "devfs_fo_ioctl: dealing with TIOCSCTTY on %s\n",
1555 dev->si_name);
1556 if (p == NULL) {
1557 error = ENOTTY;
1558 goto out;
1559 }
1560 sess = p->p_session;
1561
1562 /*
1563 * Do nothing if reassigning same control tty
1564 */
1565 if (sess->s_ttyvp == vp) {
1566 error = 0;
1567 goto out;
1568 }
1569
1570 /*
1571 * Get rid of reference to old control tty
1572 */
1573 ovp = sess->s_ttyvp;
1574 vref(vp);
1575 sess->s_ttyvp = vp;
1576 if (ovp)
1577 vrele(ovp);
1578 }
1579
1580 out:
1581 release_dev(dev);
1582 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_fo_ioctl() finished! \n");
1583 return (error);
1584 }
1585
1586
1587 static int
1588 devfs_spec_fsync(struct vop_fsync_args *ap)
1589 {
1590 struct vnode *vp = ap->a_vp;
1591 int error;
1592
1593 if (!vn_isdisk(vp, NULL))
1594 return (0);
1595
1596 /*
1597 * Flush all dirty buffers associated with a block device.
1598 */
1599 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL);
1600 return (error);
1601 }
1602
1603 static int
1604 devfs_spec_read(struct vop_read_args *ap)
1605 {
1606 struct devfs_node *node;
1607 struct vnode *vp;
1608 struct uio *uio;
1609 cdev_t dev;
1610 int error;
1611
1612 vp = ap->a_vp;
1613 dev = vp->v_rdev;
1614 uio = ap->a_uio;
1615 node = DEVFS_NODE(vp);
1616
1617 if (dev == NULL) /* device was revoked */
1618 return (EBADF);
1619 if (uio->uio_resid == 0)
1620 return (0);
1621
1622 vn_unlock(vp);
1623 error = dev_dread(dev, uio, ap->a_ioflag, NULL);
1624 vn_lock(vp, LK_SHARED | LK_RETRY);
1625
1626 if (node)
1627 nanotime(&node->atime);
1628
1629 return (error);
1630 }
1631
1632 /*
1633 * Vnode op for write
1634 *
1635 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1636 * struct ucred *a_cred)
1637 */
1638 static int
1639 devfs_spec_write(struct vop_write_args *ap)
1640 {
1641 struct devfs_node *node;
1642 struct vnode *vp;
1643 struct uio *uio;
1644 cdev_t dev;
1645 int error;
1646
1647 vp = ap->a_vp;
1648 dev = vp->v_rdev;
1649 uio = ap->a_uio;
1650 node = DEVFS_NODE(vp);
1651
1652 KKASSERT(uio->uio_segflg != UIO_NOCOPY);
1653
1654 if (dev == NULL) /* device was revoked */
1655 return (EBADF);
1656
1657 vn_unlock(vp);
1658 error = dev_dwrite(dev, uio, ap->a_ioflag, NULL);
1659 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1660
1661 if (node) {
1662 nanotime(&node->atime);
1663 nanotime(&node->mtime);
1664 }
1665
1666 return (error);
1667 }
1668
1669 /*
1670 * Device ioctl operation.
1671 *
1672 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
1673 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg)
1674 */
1675 static int
1676 devfs_spec_ioctl(struct vop_ioctl_args *ap)
1677 {
1678 struct vnode *vp = ap->a_vp;
1679 #if 0
1680 struct devfs_node *node;
1681 #endif
1682 cdev_t dev;
1683
1684 if ((dev = vp->v_rdev) == NULL)
1685 return (EBADF); /* device was revoked */
1686 #if 0
1687 node = DEVFS_NODE(vp);
1688
1689 if (node) {
1690 nanotime(&node->atime);
1691 nanotime(&node->mtime);
1692 }
1693 #endif
1694
1695 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag,
1696 ap->a_cred, ap->a_sysmsg, NULL));
1697 }
1698
1699 /*
1700 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn)
1701 */
1702 /* ARGSUSED */
1703 static int
1704 devfs_spec_kqfilter(struct vop_kqfilter_args *ap)
1705 {
1706 struct vnode *vp = ap->a_vp;
1707 #if 0
1708 struct devfs_node *node;
1709 #endif
1710 cdev_t dev;
1711
1712 if ((dev = vp->v_rdev) == NULL)
1713 return (EBADF); /* device was revoked (EBADF) */
1714 #if 0
1715 node = DEVFS_NODE(vp);
1716
1717 if (node)
1718 nanotime(&node->atime);
1719 #endif
1720
1721 return (dev_dkqfilter(dev, ap->a_kn, NULL));
1722 }
1723
1724 /*
1725 * Convert a vnode strategy call into a device strategy call. Vnode strategy
1726 * calls are not limited to device DMA limits so we have to deal with the
1727 * case.
1728 *
1729 * spec_strategy(struct vnode *a_vp, struct bio *a_bio)
1730 */
1731 static int
1732 devfs_spec_strategy(struct vop_strategy_args *ap)
1733 {
1734 struct bio *bio = ap->a_bio;
1735 struct buf *bp = bio->bio_buf;
1736 struct buf *nbp;
1737 struct vnode *vp;
1738 struct mount *mp;
1739 int chunksize;
1740 int maxiosize;
1741
1742 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL)
1743 buf_start(bp);
1744
1745 /*
1746 * Collect statistics on synchronous and asynchronous read
1747 * and write counts for disks that have associated filesystems.
1748 */
1749 vp = ap->a_vp;
1750 KKASSERT(vp->v_rdev != NULL); /* XXX */
1751 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
1752 if (bp->b_cmd == BUF_CMD_READ) {
1753 if (bp->b_flags & BIO_SYNC)
1754 mp->mnt_stat.f_syncreads++;
1755 else
1756 mp->mnt_stat.f_asyncreads++;
1757 } else {
1758 if (bp->b_flags & BIO_SYNC)
1759 mp->mnt_stat.f_syncwrites++;
1760 else
1761 mp->mnt_stat.f_asyncwrites++;
1762 }
1763 }
1764
1765 /*
1766 * Device iosize limitations only apply to read and write. Shortcut
1767 * the I/O if it fits.
1768 */
1769 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) {
1770 devfs_debug(DEVFS_DEBUG_DEBUG,
1771 "%s: si_iosize_max not set!\n",
1772 dev_dname(vp->v_rdev));
1773 maxiosize = MAXPHYS;
1774 }
1775 #if SPEC_CHAIN_DEBUG & 2
1776 maxiosize = 4096;
1777 #endif
1778 if (bp->b_bcount <= maxiosize ||
1779 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) {
1780 dev_dstrategy_chain(vp->v_rdev, bio);
1781 return (0);
1782 }
1783
1784 /*
1785 * Clone the buffer and set up an I/O chain to chunk up the I/O.
1786 */
1787 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO);
1788 initbufbio(nbp);
1789 buf_dep_init(nbp);
1790 BUF_LOCK(nbp, LK_EXCLUSIVE);
1791 BUF_KERNPROC(nbp);
1792 nbp->b_vp = vp;
1793 nbp->b_flags = B_PAGING | B_KVABIO | (bp->b_flags & B_BNOCLIP);
1794 nbp->b_cpumask = bp->b_cpumask;
1795 nbp->b_data = bp->b_data;
1796 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1797 nbp->b_bio1.bio_offset = bio->bio_offset;
1798 nbp->b_bio1.bio_caller_info1.ptr = bio;
1799
1800 /*
1801 * Start the first transfer
1802 */
1803 if (vn_isdisk(vp, NULL))
1804 chunksize = vp->v_rdev->si_bsize_phys;
1805 else
1806 chunksize = DEV_BSIZE;
1807 chunksize = maxiosize / chunksize * chunksize;
1808 #if SPEC_CHAIN_DEBUG & 1
1809 devfs_debug(DEVFS_DEBUG_DEBUG,
1810 "spec_strategy chained I/O chunksize=%d\n",
1811 chunksize);
1812 #endif
1813 nbp->b_cmd = bp->b_cmd;
1814 nbp->b_bcount = chunksize;
1815 nbp->b_bufsize = chunksize; /* used to detect a short I/O */
1816 nbp->b_bio1.bio_caller_info2.index = chunksize;
1817
1818 #if SPEC_CHAIN_DEBUG & 1
1819 devfs_debug(DEVFS_DEBUG_DEBUG,
1820 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1821 bp, 0, bp->b_bcount, nbp->b_bcount);
1822 #endif
1823
1824 dev_dstrategy(vp->v_rdev, &nbp->b_bio1);
1825
1826 if (DEVFS_NODE(vp)) {
1827 nanotime(&DEVFS_NODE(vp)->atime);
1828 nanotime(&DEVFS_NODE(vp)->mtime);
1829 }
1830
1831 return (0);
1832 }
1833
1834 /*
1835 * Chunked up transfer completion routine - chain transfers until done
1836 *
1837 * NOTE: MPSAFE callback.
1838 */
1839 static
1840 void
1841 devfs_spec_strategy_done(struct bio *nbio)
1842 {
1843 struct buf *nbp = nbio->bio_buf;
1844 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */
1845 struct buf *bp = bio->bio_buf; /* original bp */
1846 int chunksize = nbio->bio_caller_info2.index; /* chunking */
1847 int boffset = nbp->b_data - bp->b_data;
1848
1849 if (nbp->b_flags & B_ERROR) {
1850 /*
1851 * An error terminates the chain, propogate the error back
1852 * to the original bp
1853 */
1854 bp->b_flags |= B_ERROR;
1855 bp->b_error = nbp->b_error;
1856 bp->b_resid = bp->b_bcount - boffset +
1857 (nbp->b_bcount - nbp->b_resid);
1858 #if SPEC_CHAIN_DEBUG & 1
1859 devfs_debug(DEVFS_DEBUG_DEBUG,
1860 "spec_strategy: chain %p error %d bcount %d/%d\n",
1861 bp, bp->b_error, bp->b_bcount,
1862 bp->b_bcount - bp->b_resid);
1863 #endif
1864 } else if (nbp->b_resid) {
1865 /*
1866 * A short read or write terminates the chain
1867 */
1868 bp->b_error = nbp->b_error;
1869 bp->b_resid = bp->b_bcount - boffset +
1870 (nbp->b_bcount - nbp->b_resid);
1871 #if SPEC_CHAIN_DEBUG & 1
1872 devfs_debug(DEVFS_DEBUG_DEBUG,
1873 "spec_strategy: chain %p short read(1) "
1874 "bcount %d/%d\n",
1875 bp, bp->b_bcount - bp->b_resid, bp->b_bcount);
1876 #endif
1877 } else if (nbp->b_bcount != nbp->b_bufsize) {
1878 /*
1879 * A short read or write can also occur by truncating b_bcount
1880 */
1881 #if SPEC_CHAIN_DEBUG & 1
1882 devfs_debug(DEVFS_DEBUG_DEBUG,
1883 "spec_strategy: chain %p short read(2) "
1884 "bcount %d/%d\n",
1885 bp, nbp->b_bcount + boffset, bp->b_bcount);
1886 #endif
1887 bp->b_error = 0;
1888 bp->b_bcount = nbp->b_bcount + boffset;
1889 bp->b_resid = nbp->b_resid;
1890 } else if (nbp->b_bcount + boffset == bp->b_bcount) {
1891 /*
1892 * No more data terminates the chain
1893 */
1894 #if SPEC_CHAIN_DEBUG & 1
1895 devfs_debug(DEVFS_DEBUG_DEBUG,
1896 "spec_strategy: chain %p finished bcount %d\n",
1897 bp, bp->b_bcount);
1898 #endif
1899 bp->b_error = 0;
1900 bp->b_resid = 0;
1901 } else {
1902 /*
1903 * Continue the chain
1904 */
1905 boffset += nbp->b_bcount;
1906 nbp->b_data = bp->b_data + boffset;
1907 nbp->b_bcount = bp->b_bcount - boffset;
1908 if (nbp->b_bcount > chunksize)
1909 nbp->b_bcount = chunksize;
1910 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1911 nbp->b_bio1.bio_offset = bio->bio_offset + boffset;
1912
1913 #if SPEC_CHAIN_DEBUG & 1
1914 devfs_debug(DEVFS_DEBUG_DEBUG,
1915 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1916 bp, boffset, bp->b_bcount, nbp->b_bcount);
1917 #endif
1918
1919 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1);
1920 return;
1921 }
1922
1923 /*
1924 * Fall through to here on termination. biodone(bp) and
1925 * clean up and free nbp.
1926 */
1927 biodone(bio);
1928 BUF_UNLOCK(nbp);
1929 uninitbufbio(nbp);
1930 kfree(nbp, M_DEVBUF);
1931 }
1932
1933 /*
1934 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
1935 */
1936 static int
1937 devfs_spec_freeblks(struct vop_freeblks_args *ap)
1938 {
1939 struct buf *bp;
1940
1941 /*
1942 * Must be a synchronous operation
1943 */
1944 KKASSERT(ap->a_vp->v_rdev != NULL);
1945 if ((ap->a_vp->v_rdev->si_flags & SI_CANFREE) == 0)
1946 return (0);
1947 bp = getpbuf(NULL);
1948 bp->b_cmd = BUF_CMD_FREEBLKS;
1949 bp->b_bio1.bio_flags |= BIO_SYNC;
1950 bp->b_bio1.bio_offset = ap->a_offset;
1951 bp->b_bio1.bio_done = biodone_sync;
1952 bp->b_bcount = ap->a_length;
1953 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1);
1954 biowait(&bp->b_bio1, "TRIM");
1955 relpbuf(bp, NULL);
1956
1957 return (0);
1958 }
1959
1960 /*
1961 * Implement degenerate case where the block requested is the block
1962 * returned, and assume that the entire device is contiguous in regards
1963 * to the contiguous block range (runp and runb).
1964 *
1965 * spec_bmap(struct vnode *a_vp, off_t a_loffset,
1966 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1967 */
1968 static int
1969 devfs_spec_bmap(struct vop_bmap_args *ap)
1970 {
1971 if (ap->a_doffsetp != NULL)
1972 *ap->a_doffsetp = ap->a_loffset;
1973 if (ap->a_runp != NULL)
1974 *ap->a_runp = MAXBSIZE;
1975 if (ap->a_runb != NULL) {
1976 if (ap->a_loffset < MAXBSIZE)
1977 *ap->a_runb = (int)ap->a_loffset;
1978 else
1979 *ap->a_runb = MAXBSIZE;
1980 }
1981 return (0);
1982 }
1983
1984
1985 /*
1986 * Special device advisory byte-level locks.
1987 *
1988 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
1989 * struct flock *a_fl, int a_flags)
1990 */
1991 /* ARGSUSED */
1992 static int
1993 devfs_spec_advlock(struct vop_advlock_args *ap)
1994 {
1995 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP);
1996 }
1997
1998 /*
1999 * NOTE: MPSAFE callback.
2000 */
2001 static void
2002 devfs_spec_getpages_iodone(struct bio *bio)
2003 {
2004 bio->bio_buf->b_cmd = BUF_CMD_DONE;
2005 wakeup(bio->bio_buf);
2006 }
2007
2008 /*
2009 * spec_getpages() - get pages associated with device vnode.
2010 *
2011 * Note that spec_read and spec_write do not use the buffer cache, so we
2012 * must fully implement getpages here.
2013 */
2014 static int
2015 devfs_spec_getpages(struct vop_getpages_args *ap)
2016 {
2017 vm_offset_t kva;
2018 int error;
2019 int i, pcount, size;
2020 struct buf *bp;
2021 vm_page_t m;
2022 vm_ooffset_t offset;
2023 int toff, nextoff, nread;
2024 struct vnode *vp = ap->a_vp;
2025 int blksiz;
2026 int gotreqpage;
2027
2028 error = 0;
2029 pcount = round_page(ap->a_count) / PAGE_SIZE;
2030
2031 /*
2032 * Calculate the offset of the transfer and do sanity check.
2033 */
2034 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
2035
2036 /*
2037 * Round up physical size for real devices. We cannot round using
2038 * v_mount's block size data because v_mount has nothing to do with
2039 * the device. i.e. it's usually '/dev'. We need the physical block
2040 * size for the device itself.
2041 *
2042 * We can't use v_rdev->si_mountpoint because it only exists when the
2043 * block device is mounted. However, we can use v_rdev.
2044 */
2045 if (vn_isdisk(vp, NULL))
2046 blksiz = vp->v_rdev->si_bsize_phys;
2047 else
2048 blksiz = DEV_BSIZE;
2049
2050 size = roundup2(ap->a_count, blksiz);
2051
2052 bp = getpbuf_kva(NULL);
2053 kva = (vm_offset_t)bp->b_data;
2054
2055 /*
2056 * Map the pages to be read into the kva.
2057 */
2058 pmap_qenter_noinval(kva, ap->a_m, pcount);
2059
2060 /* Build a minimal buffer header. */
2061 bp->b_cmd = BUF_CMD_READ;
2062 bp->b_flags |= B_KVABIO;
2063 bp->b_bcount = size;
2064 bp->b_resid = 0;
2065 bsetrunningbufspace(bp, size);
2066
2067 bp->b_bio1.bio_offset = offset;
2068 bp->b_bio1.bio_done = devfs_spec_getpages_iodone;
2069
2070 mycpu->gd_cnt.v_vnodein++;
2071 mycpu->gd_cnt.v_vnodepgsin += pcount;
2072
2073 /* Do the input. */
2074 vn_strategy(ap->a_vp, &bp->b_bio1);
2075
2076 crit_enter();
2077
2078 /* We definitely need to be at splbio here. */
2079 while (bp->b_cmd != BUF_CMD_DONE)
2080 tsleep(bp, 0, "spread", 0);
2081
2082 crit_exit();
2083
2084 if (bp->b_flags & B_ERROR) {
2085 if (bp->b_error)
2086 error = bp->b_error;
2087 else
2088 error = EIO;
2089 }
2090
2091 /*
2092 * If EOF is encountered we must zero-extend the result in order
2093 * to ensure that the page does not contain garabge. When no
2094 * error occurs, an early EOF is indicated if b_bcount got truncated.
2095 * b_resid is relative to b_bcount and should be 0, but some devices
2096 * might indicate an EOF with b_resid instead of truncating b_bcount.
2097 */
2098 nread = bp->b_bcount - bp->b_resid;
2099 if (nread < ap->a_count) {
2100 bkvasync(bp);
2101 bzero((caddr_t)kva + nread, ap->a_count - nread);
2102 }
2103 pmap_qremove_noinval(kva, pcount);
2104
2105 gotreqpage = 0;
2106 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
2107 nextoff = toff + PAGE_SIZE;
2108 m = ap->a_m[i];
2109
2110 /*
2111 * NOTE: vm_page_undirty/clear_dirty etc do not clear the
2112 * pmap modified bit. pmap modified bit should have
2113 * already been cleared.
2114 */
2115 if (nextoff <= nread) {
2116 m->valid = VM_PAGE_BITS_ALL;
2117 vm_page_undirty(m);
2118 } else if (toff < nread) {
2119 /*
2120 * Since this is a VM request, we have to supply the
2121 * unaligned offset to allow vm_page_set_valid()
2122 * to zero sub-DEV_BSIZE'd portions of the page.
2123 */
2124 vm_page_set_valid(m, 0, nread - toff);
2125 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff);
2126 } else {
2127 m->valid = 0;
2128 vm_page_undirty(m);
2129 }
2130
2131 if (i != ap->a_reqpage) {
2132 /*
2133 * Just in case someone was asking for this page we
2134 * now tell them that it is ok to use.
2135 */
2136 if (!error || (m->valid == VM_PAGE_BITS_ALL)) {
2137 if (m->valid) {
2138 if (m->flags & PG_REFERENCED) {
2139 vm_page_activate(m);
2140 } else {
2141 vm_page_deactivate(m);
2142 }
2143 vm_page_wakeup(m);
2144 } else {
2145 vm_page_free(m);
2146 }
2147 } else {
2148 vm_page_free(m);
2149 }
2150 } else if (m->valid) {
2151 gotreqpage = 1;
2152 /*
2153 * Since this is a VM request, we need to make the
2154 * entire page presentable by zeroing invalid sections.
2155 */
2156 if (m->valid != VM_PAGE_BITS_ALL)
2157 vm_page_zero_invalid(m, FALSE);
2158 }
2159 }
2160 if (!gotreqpage) {
2161 m = ap->a_m[ap->a_reqpage];
2162 devfs_debug(DEVFS_DEBUG_WARNING,
2163 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
2164 devtoname(vp->v_rdev), error, bp, bp->b_vp);
2165 devfs_debug(DEVFS_DEBUG_WARNING,
2166 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n",
2167 size, bp->b_resid, ap->a_count, m->valid);
2168 devfs_debug(DEVFS_DEBUG_WARNING,
2169 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
2170 nread, ap->a_reqpage, (u_long)m->pindex, pcount);
2171 /*
2172 * Free the buffer header back to the swap buffer pool.
2173 */
2174 relpbuf(bp, NULL);
2175 return VM_PAGER_ERROR;
2176 }
2177 /*
2178 * Free the buffer header back to the swap buffer pool.
2179 */
2180 relpbuf(bp, NULL);
2181 if (DEVFS_NODE(ap->a_vp))
2182 nanotime(&DEVFS_NODE(ap->a_vp)->mtime);
2183 return VM_PAGER_OK;
2184 }
2185
2186 static __inline
2187 int
2188 sequential_heuristic(struct uio *uio, struct file *fp)
2189 {
2190 /*
2191 * Sequential heuristic - detect sequential operation
2192 */
2193 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
2194 uio->uio_offset == fp->f_nextoff) {
2195 /*
2196 * XXX we assume that the filesystem block size is
2197 * the default. Not true, but still gives us a pretty
2198 * good indicator of how sequential the read operations
2199 * are.
2200 */
2201 int tmpseq = fp->f_seqcount;
2202
2203 tmpseq += (uio->uio_resid + MAXBSIZE - 1) / MAXBSIZE;
2204 if (tmpseq > IO_SEQMAX)
2205 tmpseq = IO_SEQMAX;
2206 fp->f_seqcount = tmpseq;
2207 return(fp->f_seqcount << IO_SEQSHIFT);
2208 }
2209
2210 /*
2211 * Not sequential, quick draw-down of seqcount
2212 */
2213 if (fp->f_seqcount > 1)
2214 fp->f_seqcount = 1;
2215 else
2216 fp->f_seqcount = 0;
2217 return(0);
2218 }
DragonFly BSD