2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/kernel.h>
39 #include <sys/fcntl.h>
42 #include <sys/signalvar.h>
43 #include <sys/vnode.h>
45 #include <sys/mount.h>
47 #include <sys/fcntl.h>
48 #include <sys/namei.h>
49 #include <sys/dirent.h>
50 #include <sys/malloc.h>
53 #include <vm/vm_pager.h>
54 #include <vm/vm_zone.h>
55 #include <vm/vm_object.h>
56 #include <sys/filio.h>
57 #include <sys/ttycom.h>
59 #include <sys/diskslice.h>
60 #include <sys/sysctl.h>
61 #include <sys/devfs.h>
62 #include <sys/pioctl.h>
64 #include <machine/limits.h>
67 #include <sys/sysref2.h>
68 #include <sys/mplock2.h>
69 #include <vm/vm_page2.h>
71 MALLOC_DECLARE(M_DEVFS);
72 #define DEVFS_BADOP (void *)devfs_badop
74 static int devfs_badop(struct vop_generic_args *);
75 static int devfs_access(struct vop_access_args *);
76 static int devfs_inactive(struct vop_inactive_args *);
77 static int devfs_reclaim(struct vop_reclaim_args *);
78 static int devfs_readdir(struct vop_readdir_args *);
79 static int devfs_getattr(struct vop_getattr_args *);
80 static int devfs_setattr(struct vop_setattr_args *);
81 static int devfs_readlink(struct vop_readlink_args *);
82 static int devfs_print(struct vop_print_args *);
84 static int devfs_nresolve(struct vop_nresolve_args *);
85 static int devfs_nlookupdotdot(struct vop_nlookupdotdot_args *);
86 static int devfs_nmkdir(struct vop_nmkdir_args *);
87 static int devfs_nsymlink(struct vop_nsymlink_args *);
88 static int devfs_nrmdir(struct vop_nrmdir_args *);
89 static int devfs_nremove(struct vop_nremove_args *);
91 static int devfs_spec_open(struct vop_open_args *);
92 static int devfs_spec_close(struct vop_close_args *);
93 static int devfs_spec_fsync(struct vop_fsync_args *);
95 static int devfs_spec_read(struct vop_read_args *);
96 static int devfs_spec_write(struct vop_write_args *);
97 static int devfs_spec_ioctl(struct vop_ioctl_args *);
98 static int devfs_spec_poll(struct vop_poll_args *);
99 static int devfs_spec_kqfilter(struct vop_kqfilter_args *);
100 static int devfs_spec_strategy(struct vop_strategy_args *);
101 static void devfs_spec_strategy_done(struct bio *);
102 static int devfs_spec_freeblks(struct vop_freeblks_args *);
103 static int devfs_spec_bmap(struct vop_bmap_args *);
104 static int devfs_spec_advlock(struct vop_advlock_args *);
105 static void devfs_spec_getpages_iodone(struct bio *);
106 static int devfs_spec_getpages(struct vop_getpages_args *);
109 static int devfs_specf_close(struct file *);
110 static int devfs_specf_read(struct file *, struct uio *, struct ucred *, int);
111 static int devfs_specf_write(struct file *, struct uio *, struct ucred *, int);
112 static int devfs_specf_stat(struct file *, struct stat *, struct ucred *);
113 static int devfs_specf_kqfilter(struct file *, struct knote *);
114 static int devfs_specf_poll(struct file *, int, struct ucred *);
115 static int devfs_specf_ioctl(struct file *, u_long, caddr_t,
116 struct ucred *, struct sysmsg *);
117 static __inline int sequential_heuristic(struct uio *, struct file *);
119 extern struct lock devfs_lock;
121 static int mpsafe_reads, mpsafe_writes, mplock_reads, mplock_writes;
124 * devfs vnode operations for regular files
126 struct vop_ops devfs_vnode_norm_vops = {
127 .vop_default = vop_defaultop,
128 .vop_access = devfs_access,
129 .vop_advlock = DEVFS_BADOP,
130 .vop_bmap = DEVFS_BADOP,
131 .vop_close = vop_stdclose,
132 .vop_getattr = devfs_getattr,
133 .vop_inactive = devfs_inactive,
134 .vop_ncreate = DEVFS_BADOP,
135 .vop_nresolve = devfs_nresolve,
136 .vop_nlookupdotdot = devfs_nlookupdotdot,
137 .vop_nlink = DEVFS_BADOP,
138 .vop_nmkdir = devfs_nmkdir,
139 .vop_nmknod = DEVFS_BADOP,
140 .vop_nremove = devfs_nremove,
141 .vop_nrename = DEVFS_BADOP,
142 .vop_nrmdir = devfs_nrmdir,
143 .vop_nsymlink = devfs_nsymlink,
144 .vop_open = vop_stdopen,
145 .vop_pathconf = vop_stdpathconf,
146 .vop_print = devfs_print,
147 .vop_read = DEVFS_BADOP,
148 .vop_readdir = devfs_readdir,
149 .vop_readlink = devfs_readlink,
150 .vop_reclaim = devfs_reclaim,
151 .vop_setattr = devfs_setattr,
152 .vop_write = DEVFS_BADOP,
153 .vop_ioctl = DEVFS_BADOP
157 * devfs vnode operations for character devices
159 struct vop_ops devfs_vnode_dev_vops = {
160 .vop_default = vop_defaultop,
161 .vop_access = devfs_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_getattr,
168 .vop_getpages = devfs_spec_getpages,
169 .vop_inactive = devfs_inactive,
170 .vop_open = devfs_spec_open,
171 .vop_pathconf = vop_stdpathconf,
172 .vop_print = devfs_print,
173 .vop_poll = devfs_spec_poll,
174 .vop_kqfilter = devfs_spec_kqfilter,
175 .vop_read = devfs_spec_read,
176 .vop_readdir = DEVFS_BADOP,
177 .vop_readlink = DEVFS_BADOP,
178 .vop_reclaim = devfs_reclaim,
179 .vop_setattr = devfs_setattr,
180 .vop_strategy = devfs_spec_strategy,
181 .vop_write = devfs_spec_write,
182 .vop_ioctl = devfs_spec_ioctl
185 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops;
187 struct fileops devfs_dev_fileops = {
188 .fo_read = devfs_specf_read,
189 .fo_write = devfs_specf_write,
190 .fo_ioctl = devfs_specf_ioctl,
191 .fo_poll = devfs_specf_poll,
192 .fo_kqfilter = devfs_specf_kqfilter,
193 .fo_stat = devfs_specf_stat,
194 .fo_close = devfs_specf_close,
195 .fo_shutdown = nofo_shutdown
199 * These two functions are possibly temporary hacks for
200 * devices (aka the pty code) which want to control the
201 * node attributes themselves.
203 * XXX we may ultimately desire to simply remove the uid/gid/mode
204 * from the node entirely.
207 node_sync_dev_get(struct devfs_node *node)
211 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
212 node->uid = dev->si_uid;
213 node->gid = dev->si_gid;
214 node->mode = dev->si_perms;
219 node_sync_dev_set(struct devfs_node *node)
223 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) {
224 dev->si_uid = node->uid;
225 dev->si_gid = node->gid;
226 dev->si_perms = node->mode;
231 * generic entry point for unsupported operations
234 devfs_badop(struct vop_generic_args *ap)
241 devfs_access(struct vop_access_args *ap)
243 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
246 if (!devfs_node_is_accessible(node))
248 node_sync_dev_get(node);
249 error = vop_helper_access(ap, node->uid, node->gid,
250 node->mode, node->flags);
257 devfs_inactive(struct vop_inactive_args *ap)
259 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
261 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0)
268 devfs_reclaim(struct vop_reclaim_args *ap)
270 struct devfs_node *node;
275 * Check if it is locked already. if not, we acquire the devfs lock
277 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) {
278 lockmgr(&devfs_lock, LK_EXCLUSIVE);
285 * Get rid of the devfs_node if it is no longer linked into the
289 if ((node = DEVFS_NODE(vp)) != NULL) {
291 if ((node->flags & DEVFS_NODE_LINKED) == 0)
296 lockmgr(&devfs_lock, LK_RELEASE);
299 * v_rdev needs to be properly released using v_release_rdev
300 * Make sure v_data is NULL as well.
309 devfs_readdir(struct vop_readdir_args *ap)
311 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp);
312 struct devfs_node *node;
321 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n");
323 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX)
325 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0)
328 if (!devfs_node_is_accessible(dnode)) {
333 lockmgr(&devfs_lock, LK_EXCLUSIVE);
335 saveoff = ap->a_uio->uio_offset;
337 if (ap->a_ncookies) {
338 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */
341 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK);
349 nanotime(&dnode->atime);
352 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino,
357 cookies[cookie_index] = saveoff;
360 if (cookie_index == ncookies)
366 r = vop_write_dirent(&error, ap->a_uio,
367 dnode->parent->d_dir.d_ino,
370 r = vop_write_dirent(&error, ap->a_uio,
377 cookies[cookie_index] = saveoff;
380 if (cookie_index == ncookies)
384 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
385 if ((node->flags & DEVFS_HIDDEN) ||
386 (node->flags & DEVFS_INVISIBLE)) {
391 * If the node type is a valid devfs alias, then we make sure that the
392 * target isn't hidden. If it is, we don't show the link in the
395 if ((node->node_type == Plink) && (node->link_target != NULL) &&
396 (node->link_target->flags & DEVFS_HIDDEN))
399 if (node->cookie < saveoff)
402 saveoff = node->cookie;
404 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino,
406 node->d_dir.d_namlen,
415 cookies[cookie_index] = node->cookie;
417 if (cookie_index == ncookies)
422 lockmgr(&devfs_lock, LK_RELEASE);
425 ap->a_uio->uio_offset = saveoff;
426 if (error && cookie_index == 0) {
428 kfree(cookies, M_TEMP);
430 *ap->a_cookies = NULL;
434 *ap->a_ncookies = cookie_index;
435 *ap->a_cookies = cookies;
443 devfs_nresolve(struct vop_nresolve_args *ap)
445 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
446 struct devfs_node *node, *found = NULL;
447 struct namecache *ncp;
448 struct vnode *vp = NULL;
453 ncp = ap->a_nch->ncp;
456 if (!devfs_node_is_accessible(dnode))
459 lockmgr(&devfs_lock, LK_EXCLUSIVE);
461 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) {
463 cache_setvp(ap->a_nch, NULL);
467 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
468 if (len == node->d_dir.d_namlen) {
469 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) {
478 while ((found->node_type == Plink) && (found->link_target)) {
480 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8");
484 found = found->link_target;
488 if (!(found->flags & DEVFS_HIDDEN))
489 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp, found);
494 cache_setvp(ap->a_nch, NULL);
500 cache_setvp(ap->a_nch, vp);
503 lockmgr(&devfs_lock, LK_RELEASE);
510 devfs_nlookupdotdot(struct vop_nlookupdotdot_args *ap)
512 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
515 if (!devfs_node_is_accessible(dnode))
518 lockmgr(&devfs_lock, LK_EXCLUSIVE);
519 if (dnode->parent != NULL) {
520 devfs_allocv(ap->a_vpp, dnode->parent);
521 vn_unlock(*ap->a_vpp);
523 lockmgr(&devfs_lock, LK_RELEASE);
525 return ((*ap->a_vpp == NULL) ? ENOENT : 0);
530 devfs_getattr(struct vop_getattr_args *ap)
532 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
533 struct vattr *vap = ap->a_vap;
534 struct partinfo pinfo;
538 if (!devfs_node_is_accessible(node))
541 node_sync_dev_get(node);
543 lockmgr(&devfs_lock, LK_EXCLUSIVE);
545 /* start by zeroing out the attributes */
548 /* next do all the common fields */
549 vap->va_type = ap->a_vp->v_type;
550 vap->va_mode = node->mode;
551 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ;
553 vap->va_blocksize = DEV_BSIZE;
554 vap->va_bytes = vap->va_size = 0;
556 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
558 vap->va_atime = node->atime;
559 vap->va_mtime = node->mtime;
560 vap->va_ctime = node->ctime;
562 vap->va_nlink = 1; /* number of references to file */
564 vap->va_uid = node->uid;
565 vap->va_gid = node->gid;
570 if ((node->node_type == Pdev) && node->d_dev) {
571 reference_dev(node->d_dev);
572 vap->va_rminor = node->d_dev->si_uminor;
573 release_dev(node->d_dev);
576 /* For a softlink the va_size is the length of the softlink */
577 if (node->symlink_name != 0) {
578 vap->va_bytes = vap->va_size = node->symlink_namelen;
582 * For a disk-type device, va_size is the size of the underlying
583 * device, so that lseek() works properly.
585 if ((node->d_dev) && (dev_dflags(node->d_dev) & D_DISK)) {
586 bzero(&pinfo, sizeof(pinfo));
587 error = dev_dioctl(node->d_dev, DIOCGPART, (void *)&pinfo,
588 0, proc0.p_ucred, NULL);
589 if ((error == 0) && (pinfo.media_blksize != 0)) {
590 vap->va_size = pinfo.media_size;
597 lockmgr(&devfs_lock, LK_RELEASE);
604 devfs_setattr(struct vop_setattr_args *ap)
606 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
610 if (!devfs_node_is_accessible(node))
612 node_sync_dev_get(node);
614 lockmgr(&devfs_lock, LK_EXCLUSIVE);
618 if (vap->va_uid != (uid_t)VNOVAL) {
619 if ((ap->a_cred->cr_uid != node->uid) &&
620 (!groupmember(node->gid, ap->a_cred))) {
621 error = priv_check(curthread, PRIV_VFS_CHOWN);
625 node->uid = vap->va_uid;
628 if (vap->va_gid != (uid_t)VNOVAL) {
629 if ((ap->a_cred->cr_uid != node->uid) &&
630 (!groupmember(node->gid, ap->a_cred))) {
631 error = priv_check(curthread, PRIV_VFS_CHOWN);
635 node->gid = vap->va_gid;
638 if (vap->va_mode != (mode_t)VNOVAL) {
639 if (ap->a_cred->cr_uid != node->uid) {
640 error = priv_check(curthread, PRIV_VFS_ADMIN);
644 node->mode = vap->va_mode;
648 node_sync_dev_set(node);
649 nanotime(&node->ctime);
650 lockmgr(&devfs_lock, LK_RELEASE);
657 devfs_readlink(struct vop_readlink_args *ap)
659 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
662 if (!devfs_node_is_accessible(node))
665 lockmgr(&devfs_lock, LK_EXCLUSIVE);
666 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio);
667 lockmgr(&devfs_lock, LK_RELEASE);
674 devfs_print(struct vop_print_args *ap)
680 devfs_nmkdir(struct vop_nmkdir_args *ap)
682 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
683 struct devfs_node *node;
685 if (!devfs_node_is_accessible(dnode))
688 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir))
691 lockmgr(&devfs_lock, LK_EXCLUSIVE);
692 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Pdir,
693 ap->a_nch->ncp->nc_name, dnode, NULL);
696 node = DEVFS_NODE(*ap->a_vpp);
697 node->flags |= DEVFS_USER_CREATED;
698 cache_setunresolved(ap->a_nch);
699 cache_setvp(ap->a_nch, *ap->a_vpp);
701 lockmgr(&devfs_lock, LK_RELEASE);
703 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
707 devfs_nsymlink(struct vop_nsymlink_args *ap)
709 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
710 struct devfs_node *node;
713 if (!devfs_node_is_accessible(dnode))
716 ap->a_vap->va_type = VLNK;
718 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir))
721 lockmgr(&devfs_lock, LK_EXCLUSIVE);
722 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Plink,
723 ap->a_nch->ncp->nc_name, dnode, NULL);
725 targetlen = strlen(ap->a_target);
727 node = DEVFS_NODE(*ap->a_vpp);
728 node->flags |= DEVFS_USER_CREATED;
729 node->symlink_namelen = targetlen;
730 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK);
731 memcpy(node->symlink_name, ap->a_target, targetlen);
732 node->symlink_name[targetlen] = '\0';
733 cache_setunresolved(ap->a_nch);
734 cache_setvp(ap->a_nch, *ap->a_vpp);
736 lockmgr(&devfs_lock, LK_RELEASE);
738 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
742 devfs_nrmdir(struct vop_nrmdir_args *ap)
744 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
745 struct devfs_node *node;
746 struct namecache *ncp;
749 ncp = ap->a_nch->ncp;
751 if (!devfs_node_is_accessible(dnode))
754 lockmgr(&devfs_lock, LK_EXCLUSIVE);
756 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir))
759 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
760 if (ncp->nc_nlen != node->d_dir.d_namlen)
762 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen))
766 * only allow removal of user created dirs
768 if ((node->flags & DEVFS_USER_CREATED) == 0) {
771 } else if (node->node_type != Pdir) {
774 } else if (node->nchildren > 2) {
779 cache_inval_vp(node->v_node, CINV_DESTROY);
786 cache_setunresolved(ap->a_nch);
787 cache_setvp(ap->a_nch, NULL);
790 lockmgr(&devfs_lock, LK_RELEASE);
795 devfs_nremove(struct vop_nremove_args *ap)
797 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
798 struct devfs_node *node;
799 struct namecache *ncp;
802 ncp = ap->a_nch->ncp;
804 if (!devfs_node_is_accessible(dnode))
807 lockmgr(&devfs_lock, LK_EXCLUSIVE);
809 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir))
812 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) {
813 if (ncp->nc_nlen != node->d_dir.d_namlen)
815 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen))
819 * only allow removal of user created stuff (e.g. symlinks)
821 if ((node->flags & DEVFS_USER_CREATED) == 0) {
824 } else if (node->node_type == Pdir) {
829 cache_inval_vp(node->v_node, CINV_DESTROY);
836 cache_setunresolved(ap->a_nch);
837 cache_setvp(ap->a_nch, NULL);
840 lockmgr(&devfs_lock, LK_RELEASE);
846 devfs_spec_open(struct vop_open_args *ap)
848 struct vnode *vp = ap->a_vp;
849 struct vnode *orig_vp = NULL;
850 struct devfs_node *node = DEVFS_NODE(vp);
851 struct devfs_node *newnode;
852 cdev_t dev, ndev = NULL;
856 if (node->d_dev == NULL)
858 if (!devfs_node_is_accessible(node))
862 if ((dev = vp->v_rdev) == NULL)
865 if (node && ap->a_fp) {
866 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n");
867 lockmgr(&devfs_lock, LK_EXCLUSIVE);
869 ndev = devfs_clone(dev, node->d_dir.d_name, node->d_dir.d_namlen,
870 ap->a_mode, ap->a_cred);
872 newnode = devfs_create_device_node(
873 DEVFS_MNTDATA(vp->v_mount)->root_node,
875 /* XXX: possibly destroy device if this happens */
877 if (newnode != NULL) {
881 devfs_debug(DEVFS_DEBUG_DEBUG,
882 "parent here is: %s, node is: |%s|\n",
883 ((node->parent->node_type == Proot) ?
884 "ROOT!" : node->parent->d_dir.d_name),
885 newnode->d_dir.d_name);
886 devfs_debug(DEVFS_DEBUG_DEBUG,
888 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name);
891 * orig_vp is set to the original vp if we cloned.
893 /* node->flags |= DEVFS_CLONED; */
894 devfs_allocv(&vp, newnode);
899 lockmgr(&devfs_lock, LK_RELEASE);
902 devfs_debug(DEVFS_DEBUG_DEBUG,
903 "devfs_spec_open() called on %s! \n",
907 * Make this field valid before any I/O in ->d_open
909 if (!dev->si_iosize_max)
910 dev->si_iosize_max = DFLTPHYS;
912 if (dev_dflags(dev) & D_TTY)
913 vsetflags(vp, VISTTY);
916 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred);
917 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
920 * Clean up any cloned vp if we error out.
926 /* orig_vp = NULL; */
932 * This checks if the disk device is going to be opened for writing.
933 * It will be only allowed in the cases where securelevel permits it
934 * and it's not mounted R/W.
936 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) &&
937 (ap->a_cred != FSCRED)) {
939 /* Very secure mode. No open for writing allowed */
940 if (securelevel >= 2)
944 * If it is mounted R/W, do not allow to open for writing.
945 * In the case it's mounted read-only but securelevel
946 * is >= 1, then do not allow opening for writing either.
948 if (vfs_mountedon(vp)) {
949 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY))
951 else if (securelevel >= 1)
956 if (dev_dflags(dev) & D_TTY) {
961 devfs_debug(DEVFS_DEBUG_DEBUG,
962 "devfs: no t_stop\n");
963 tp->t_stop = nottystop;
969 if (vn_isdisk(vp, NULL)) {
970 if (!dev->si_bsize_phys)
971 dev->si_bsize_phys = DEV_BSIZE;
972 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1);
978 nanotime(&node->atime);
984 /* Ugly pty magic, to make pty devices appear once they are opened */
985 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY)
986 node->flags &= ~DEVFS_INVISIBLE;
989 ap->a_fp->f_type = DTYPE_VNODE;
990 ap->a_fp->f_flag = ap->a_mode & FMASK;
991 ap->a_fp->f_ops = &devfs_dev_fileops;
992 ap->a_fp->f_data = vp;
1000 devfs_spec_close(struct vop_close_args *ap)
1002 struct devfs_node *node = DEVFS_NODE(ap->a_vp);
1003 struct proc *p = curproc;
1004 struct vnode *vp = ap->a_vp;
1005 cdev_t dev = vp->v_rdev;
1009 devfs_debug(DEVFS_DEBUG_DEBUG,
1010 "devfs_spec_close() called on %s! \n",
1014 * A couple of hacks for devices and tty devices. The
1015 * vnode ref count cannot be used to figure out the
1016 * last close, but we can use v_opencount now that
1017 * revoke works properly.
1019 * Detect the last close on a controlling terminal and clear
1020 * the session (half-close).
1025 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) {
1026 p->p_session->s_ttyvp = NULL;
1031 * Vnodes can be opened and closed multiple times. Do not really
1032 * close the device unless (1) it is being closed forcibly,
1033 * (2) the device wants to track closes, or (3) this is the last
1034 * vnode doing its last close on the device.
1036 * XXX the VXLOCK (force close) case can leave vnodes referencing
1037 * a closed device. This might not occur now that our revoke is
1040 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n");
1041 if (dev && ((vp->v_flag & VRECLAIMED) ||
1042 (dev_dflags(dev) & D_TRACKCLOSE) ||
1043 (vp->v_opencount == 1))) {
1045 * Unlock around dev_dclose()
1048 if (vn_islocked(vp)) {
1052 error = dev_dclose(dev, ap->a_fflag, S_IFCHR);
1055 * Ugly pty magic, to make pty devices disappear again once
1058 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY)
1059 node->flags |= DEVFS_INVISIBLE;
1062 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1066 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n");
1069 * Track the actual opens and closes on the vnode. The last close
1070 * disassociates the rdev. If the rdev is already disassociated or
1071 * the opencount is already 0, the vnode might have been revoked
1072 * and no further opencount tracking occurs.
1076 if (vp->v_opencount > 0)
1084 devfs_specf_close(struct file *fp)
1086 struct vnode *vp = (struct vnode *)fp->f_data;
1090 fp->f_ops = &badfileops;
1091 error = vn_close(vp, fp->f_flag);
1099 * Device-optimized file table vnode read routine.
1101 * This bypasses the VOP table and talks directly to the device. Most
1102 * filesystems just route to specfs and can make this optimization.
1104 * MPALMOSTSAFE - acquires mplock
1107 devfs_specf_read(struct file *fp, struct uio *uio,
1108 struct ucred *cred, int flags)
1110 struct devfs_node *node;
1116 KASSERT(uio->uio_td == curthread,
1117 ("uio_td %p is not td %p", uio->uio_td, curthread));
1119 if (uio->uio_resid == 0)
1122 vp = (struct vnode *)fp->f_data;
1123 if (vp == NULL || vp->v_type == VBAD)
1126 node = DEVFS_NODE(vp);
1128 if ((dev = vp->v_rdev) == NULL)
1131 /* only acquire mplock for devices that require it */
1132 if (!(dev_dflags(dev) & D_MPSAFE_READ)) {
1133 atomic_add_int(&mplock_reads, 1);
1136 atomic_add_int(&mpsafe_reads, 1);
1141 if ((flags & O_FOFFSET) == 0)
1142 uio->uio_offset = fp->f_offset;
1145 if (flags & O_FBLOCKING) {
1146 /* ioflag &= ~IO_NDELAY; */
1147 } else if (flags & O_FNONBLOCKING) {
1148 ioflag |= IO_NDELAY;
1149 } else if (fp->f_flag & FNONBLOCK) {
1150 ioflag |= IO_NDELAY;
1152 if (flags & O_FBUFFERED) {
1153 /* ioflag &= ~IO_DIRECT; */
1154 } else if (flags & O_FUNBUFFERED) {
1155 ioflag |= IO_DIRECT;
1156 } else if (fp->f_flag & O_DIRECT) {
1157 ioflag |= IO_DIRECT;
1159 ioflag |= sequential_heuristic(uio, fp);
1161 error = dev_dread(dev, uio, ioflag);
1165 nanotime(&node->atime);
1166 if ((flags & O_FOFFSET) == 0)
1167 fp->f_offset = uio->uio_offset;
1168 fp->f_nextoff = uio->uio_offset;
1170 if (!(dev_dflags(dev) & D_MPSAFE_READ))
1178 devfs_specf_write(struct file *fp, struct uio *uio,
1179 struct ucred *cred, int flags)
1181 struct devfs_node *node;
1187 KASSERT(uio->uio_td == curthread,
1188 ("uio_td %p is not p %p", uio->uio_td, curthread));
1190 vp = (struct vnode *)fp->f_data;
1191 if (vp == NULL || vp->v_type == VBAD)
1194 node = DEVFS_NODE(vp);
1196 if (vp->v_type == VREG)
1197 bwillwrite(uio->uio_resid);
1199 vp = (struct vnode *)fp->f_data;
1201 if ((dev = vp->v_rdev) == NULL)
1204 /* only acquire mplock for devices that require it */
1205 if (!(dev_dflags(dev) & D_MPSAFE_WRITE)) {
1206 atomic_add_int(&mplock_writes, 1);
1209 atomic_add_int(&mpsafe_writes, 1);
1214 if ((flags & O_FOFFSET) == 0)
1215 uio->uio_offset = fp->f_offset;
1218 if (vp->v_type == VREG &&
1219 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
1220 ioflag |= IO_APPEND;
1223 if (flags & O_FBLOCKING) {
1224 /* ioflag &= ~IO_NDELAY; */
1225 } else if (flags & O_FNONBLOCKING) {
1226 ioflag |= IO_NDELAY;
1227 } else if (fp->f_flag & FNONBLOCK) {
1228 ioflag |= IO_NDELAY;
1230 if (flags & O_FBUFFERED) {
1231 /* ioflag &= ~IO_DIRECT; */
1232 } else if (flags & O_FUNBUFFERED) {
1233 ioflag |= IO_DIRECT;
1234 } else if (fp->f_flag & O_DIRECT) {
1235 ioflag |= IO_DIRECT;
1237 if (flags & O_FASYNCWRITE) {
1238 /* ioflag &= ~IO_SYNC; */
1239 } else if (flags & O_FSYNCWRITE) {
1241 } else if (fp->f_flag & O_FSYNC) {
1245 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
1247 ioflag |= sequential_heuristic(uio, fp);
1249 error = dev_dwrite(dev, uio, ioflag);
1253 nanotime(&node->atime);
1254 nanotime(&node->mtime);
1257 if ((flags & O_FOFFSET) == 0)
1258 fp->f_offset = uio->uio_offset;
1259 fp->f_nextoff = uio->uio_offset;
1261 if (!(dev_dflags(dev) & D_MPSAFE_WRITE))
1268 devfs_specf_stat(struct file *fp, struct stat *sb, struct ucred *cred)
1277 vp = (struct vnode *)fp->f_data;
1278 if (vp == NULL || vp->v_type == VBAD)
1281 error = vn_stat(vp, sb, cred);
1286 error = VOP_GETATTR(vp, vap);
1291 * Zero the spare stat fields
1298 * Copy from vattr table ... or not in case it's a cloned device
1300 if (vap->va_fsid != VNOVAL)
1301 sb->st_dev = vap->va_fsid;
1303 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1305 sb->st_ino = vap->va_fileid;
1307 mode = vap->va_mode;
1311 if (vap->va_nlink > (nlink_t)-1)
1312 sb->st_nlink = (nlink_t)-1;
1314 sb->st_nlink = vap->va_nlink;
1316 sb->st_uid = vap->va_uid;
1317 sb->st_gid = vap->va_gid;
1318 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev);
1319 sb->st_size = vap->va_bytes;
1320 sb->st_atimespec = vap->va_atime;
1321 sb->st_mtimespec = vap->va_mtime;
1322 sb->st_ctimespec = vap->va_ctime;
1325 * A VCHR and VBLK device may track the last access and last modified
1326 * time independantly of the filesystem. This is particularly true
1327 * because device read and write calls may bypass the filesystem.
1329 if (vp->v_type == VCHR || vp->v_type == VBLK) {
1332 if (dev->si_lastread) {
1333 sb->st_atimespec.tv_sec = dev->si_lastread;
1334 sb->st_atimespec.tv_nsec = 0;
1336 if (dev->si_lastwrite) {
1337 sb->st_atimespec.tv_sec = dev->si_lastwrite;
1338 sb->st_atimespec.tv_nsec = 0;
1344 * According to www.opengroup.org, the meaning of st_blksize is
1345 * "a filesystem-specific preferred I/O block size for this
1346 * object. In some filesystem types, this may vary from file
1348 * Default to PAGE_SIZE after much discussion.
1351 sb->st_blksize = PAGE_SIZE;
1353 sb->st_flags = vap->va_flags;
1355 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
1359 sb->st_gen = (u_int32_t)vap->va_gen;
1361 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1368 devfs_specf_kqfilter(struct file *fp, struct knote *kn)
1376 vp = (struct vnode *)fp->f_data;
1377 if (vp == NULL || vp->v_type == VBAD) {
1381 if ((dev = vp->v_rdev) == NULL) {
1387 error = dev_dkqfilter(dev, kn);
1398 devfs_specf_poll(struct file *fp, int events, struct ucred *cred)
1400 struct devfs_node *node;
1407 vp = (struct vnode *)fp->f_data;
1408 if (vp == NULL || vp->v_type == VBAD) {
1412 node = DEVFS_NODE(vp);
1414 if ((dev = vp->v_rdev) == NULL) {
1419 error = dev_dpoll(dev, events);
1425 nanotime(&node->atime);
1434 * MPALMOSTSAFE - acquires mplock
1437 devfs_specf_ioctl(struct file *fp, u_long com, caddr_t data,
1438 struct ucred *ucred, struct sysmsg *msg)
1440 struct devfs_node *node;
1445 struct fiodname_args *name_args;
1449 vp = ((struct vnode *)fp->f_data);
1451 if ((dev = vp->v_rdev) == NULL)
1452 return EBADF; /* device was revoked */
1456 node = DEVFS_NODE(vp);
1458 devfs_debug(DEVFS_DEBUG_DEBUG,
1459 "devfs_specf_ioctl() called! for dev %s\n",
1462 if (com == FIODTYPE) {
1463 *(int *)data = dev_dflags(dev) & D_TYPEMASK;
1466 } else if (com == FIODNAME) {
1467 name_args = (struct fiodname_args *)data;
1468 name = dev->si_name;
1469 namlen = strlen(name) + 1;
1471 devfs_debug(DEVFS_DEBUG_DEBUG,
1472 "ioctl, got: FIODNAME for %s\n", name);
1474 if (namlen <= name_args->len)
1475 error = copyout(dev->si_name, name_args->name, namlen);
1479 devfs_debug(DEVFS_DEBUG_DEBUG,
1480 "ioctl stuff: error: %d\n", error);
1484 /* only acquire mplock for devices that require it */
1485 if (!(dev_dflags(dev) & D_MPSAFE_IOCTL))
1488 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg);
1492 nanotime(&node->atime);
1493 nanotime(&node->mtime);
1497 if (!(dev_dflags(dev) & D_MPSAFE_IOCTL))
1500 if (com == TIOCSCTTY) {
1501 devfs_debug(DEVFS_DEBUG_DEBUG,
1502 "devfs_specf_ioctl: got TIOCSCTTY on %s\n",
1505 if (error == 0 && com == TIOCSCTTY) {
1506 struct proc *p = curthread->td_proc;
1507 struct session *sess;
1509 devfs_debug(DEVFS_DEBUG_DEBUG,
1510 "devfs_specf_ioctl: dealing with TIOCSCTTY on %s\n",
1516 sess = p->p_session;
1519 * Do nothing if reassigning same control tty
1521 if (sess->s_ttyvp == vp) {
1527 * Get rid of reference to old control tty
1529 ovp = sess->s_ttyvp;
1538 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_specf_ioctl() finished! \n");
1544 devfs_spec_fsync(struct vop_fsync_args *ap)
1546 struct vnode *vp = ap->a_vp;
1549 if (!vn_isdisk(vp, NULL))
1553 * Flush all dirty buffers associated with a block device.
1555 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL);
1560 devfs_spec_read(struct vop_read_args *ap)
1562 struct devfs_node *node;
1571 node = DEVFS_NODE(vp);
1573 if (dev == NULL) /* device was revoked */
1575 if (uio->uio_resid == 0)
1579 error = dev_dread(dev, uio, ap->a_ioflag);
1580 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1583 nanotime(&node->atime);
1589 * Vnode op for write
1591 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1592 * struct ucred *a_cred)
1595 devfs_spec_write(struct vop_write_args *ap)
1597 struct devfs_node *node;
1606 node = DEVFS_NODE(vp);
1608 KKASSERT(uio->uio_segflg != UIO_NOCOPY);
1610 if (dev == NULL) /* device was revoked */
1614 error = dev_dwrite(dev, uio, ap->a_ioflag);
1615 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1618 nanotime(&node->atime);
1619 nanotime(&node->mtime);
1626 * Device ioctl operation.
1628 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
1629 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg)
1632 devfs_spec_ioctl(struct vop_ioctl_args *ap)
1634 struct vnode *vp = ap->a_vp;
1635 struct devfs_node *node;
1638 if ((dev = vp->v_rdev) == NULL)
1639 return (EBADF); /* device was revoked */
1640 node = DEVFS_NODE(vp);
1644 nanotime(&node->atime);
1645 nanotime(&node->mtime);
1649 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag,
1650 ap->a_cred, ap->a_sysmsg));
1654 * spec_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred)
1658 devfs_spec_poll(struct vop_poll_args *ap)
1660 struct vnode *vp = ap->a_vp;
1661 struct devfs_node *node;
1664 if ((dev = vp->v_rdev) == NULL)
1665 return (EBADF); /* device was revoked */
1666 node = DEVFS_NODE(vp);
1670 nanotime(&node->atime);
1673 return (dev_dpoll(dev, ap->a_events));
1677 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn)
1681 devfs_spec_kqfilter(struct vop_kqfilter_args *ap)
1683 struct vnode *vp = ap->a_vp;
1684 struct devfs_node *node;
1687 if ((dev = vp->v_rdev) == NULL)
1688 return (EBADF); /* device was revoked */
1689 node = DEVFS_NODE(vp);
1693 nanotime(&node->atime);
1696 return (dev_dkqfilter(dev, ap->a_kn));
1700 * Convert a vnode strategy call into a device strategy call. Vnode strategy
1701 * calls are not limited to device DMA limits so we have to deal with the
1704 * spec_strategy(struct vnode *a_vp, struct bio *a_bio)
1707 devfs_spec_strategy(struct vop_strategy_args *ap)
1709 struct bio *bio = ap->a_bio;
1710 struct buf *bp = bio->bio_buf;
1717 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL)
1721 * Collect statistics on synchronous and asynchronous read
1722 * and write counts for disks that have associated filesystems.
1725 KKASSERT(vp->v_rdev != NULL); /* XXX */
1726 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
1727 if (bp->b_cmd == BUF_CMD_READ) {
1728 if (bp->b_flags & BIO_SYNC)
1729 mp->mnt_stat.f_syncreads++;
1731 mp->mnt_stat.f_asyncreads++;
1733 if (bp->b_flags & BIO_SYNC)
1734 mp->mnt_stat.f_syncwrites++;
1736 mp->mnt_stat.f_asyncwrites++;
1741 * Device iosize limitations only apply to read and write. Shortcut
1742 * the I/O if it fits.
1744 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) {
1745 devfs_debug(DEVFS_DEBUG_DEBUG,
1746 "%s: si_iosize_max not set!\n",
1747 dev_dname(vp->v_rdev));
1748 maxiosize = MAXPHYS;
1750 #if SPEC_CHAIN_DEBUG & 2
1753 if (bp->b_bcount <= maxiosize ||
1754 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) {
1755 dev_dstrategy_chain(vp->v_rdev, bio);
1760 * Clone the buffer and set up an I/O chain to chunk up the I/O.
1762 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO);
1766 BUF_LOCK(nbp, LK_EXCLUSIVE);
1769 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP);
1770 nbp->b_data = bp->b_data;
1771 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1772 nbp->b_bio1.bio_offset = bio->bio_offset;
1773 nbp->b_bio1.bio_caller_info1.ptr = bio;
1776 * Start the first transfer
1778 if (vn_isdisk(vp, NULL))
1779 chunksize = vp->v_rdev->si_bsize_phys;
1781 chunksize = DEV_BSIZE;
1782 chunksize = maxiosize / chunksize * chunksize;
1783 #if SPEC_CHAIN_DEBUG & 1
1784 devfs_debug(DEVFS_DEBUG_DEBUG,
1785 "spec_strategy chained I/O chunksize=%d\n",
1788 nbp->b_cmd = bp->b_cmd;
1789 nbp->b_bcount = chunksize;
1790 nbp->b_bufsize = chunksize; /* used to detect a short I/O */
1791 nbp->b_bio1.bio_caller_info2.index = chunksize;
1793 #if SPEC_CHAIN_DEBUG & 1
1794 devfs_debug(DEVFS_DEBUG_DEBUG,
1795 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1796 bp, 0, bp->b_bcount, nbp->b_bcount);
1799 dev_dstrategy(vp->v_rdev, &nbp->b_bio1);
1801 if (DEVFS_NODE(vp)) {
1802 nanotime(&DEVFS_NODE(vp)->atime);
1803 nanotime(&DEVFS_NODE(vp)->mtime);
1810 * Chunked up transfer completion routine - chain transfers until done
1814 devfs_spec_strategy_done(struct bio *nbio)
1816 struct buf *nbp = nbio->bio_buf;
1817 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */
1818 struct buf *bp = bio->bio_buf; /* original bp */
1819 int chunksize = nbio->bio_caller_info2.index; /* chunking */
1820 int boffset = nbp->b_data - bp->b_data;
1822 if (nbp->b_flags & B_ERROR) {
1824 * An error terminates the chain, propogate the error back
1825 * to the original bp
1827 bp->b_flags |= B_ERROR;
1828 bp->b_error = nbp->b_error;
1829 bp->b_resid = bp->b_bcount - boffset +
1830 (nbp->b_bcount - nbp->b_resid);
1831 #if SPEC_CHAIN_DEBUG & 1
1832 devfs_debug(DEVFS_DEBUG_DEBUG,
1833 "spec_strategy: chain %p error %d bcount %d/%d\n",
1834 bp, bp->b_error, bp->b_bcount,
1835 bp->b_bcount - bp->b_resid);
1837 kfree(nbp, M_DEVBUF);
1839 } else if (nbp->b_resid) {
1841 * A short read or write terminates the chain
1843 bp->b_error = nbp->b_error;
1844 bp->b_resid = bp->b_bcount - boffset +
1845 (nbp->b_bcount - nbp->b_resid);
1846 #if SPEC_CHAIN_DEBUG & 1
1847 devfs_debug(DEVFS_DEBUG_DEBUG,
1848 "spec_strategy: chain %p short read(1) "
1850 bp, bp->b_bcount - bp->b_resid, bp->b_bcount);
1852 kfree(nbp, M_DEVBUF);
1854 } else if (nbp->b_bcount != nbp->b_bufsize) {
1856 * A short read or write can also occur by truncating b_bcount
1858 #if SPEC_CHAIN_DEBUG & 1
1859 devfs_debug(DEVFS_DEBUG_DEBUG,
1860 "spec_strategy: chain %p short read(2) "
1862 bp, nbp->b_bcount + boffset, bp->b_bcount);
1865 bp->b_bcount = nbp->b_bcount + boffset;
1866 bp->b_resid = nbp->b_resid;
1867 kfree(nbp, M_DEVBUF);
1869 } else if (nbp->b_bcount + boffset == bp->b_bcount) {
1871 * No more data terminates the chain
1873 #if SPEC_CHAIN_DEBUG & 1
1874 devfs_debug(DEVFS_DEBUG_DEBUG,
1875 "spec_strategy: chain %p finished bcount %d\n",
1880 kfree(nbp, M_DEVBUF);
1884 * Continue the chain
1886 boffset += nbp->b_bcount;
1887 nbp->b_data = bp->b_data + boffset;
1888 nbp->b_bcount = bp->b_bcount - boffset;
1889 if (nbp->b_bcount > chunksize)
1890 nbp->b_bcount = chunksize;
1891 nbp->b_bio1.bio_done = devfs_spec_strategy_done;
1892 nbp->b_bio1.bio_offset = bio->bio_offset + boffset;
1894 #if SPEC_CHAIN_DEBUG & 1
1895 devfs_debug(DEVFS_DEBUG_DEBUG,
1896 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1897 bp, boffset, bp->b_bcount, nbp->b_bcount);
1900 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1);
1905 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
1908 devfs_spec_freeblks(struct vop_freeblks_args *ap)
1913 * XXX: This assumes that strategy does the deed right away.
1914 * XXX: this may not be TRTTD.
1916 KKASSERT(ap->a_vp->v_rdev != NULL);
1917 if ((dev_dflags(ap->a_vp->v_rdev) & D_CANFREE) == 0)
1919 bp = geteblk(ap->a_length);
1920 bp->b_cmd = BUF_CMD_FREEBLKS;
1921 bp->b_bio1.bio_offset = ap->a_offset;
1922 bp->b_bcount = ap->a_length;
1923 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1);
1928 * Implement degenerate case where the block requested is the block
1929 * returned, and assume that the entire device is contiguous in regards
1930 * to the contiguous block range (runp and runb).
1932 * spec_bmap(struct vnode *a_vp, off_t a_loffset,
1933 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1936 devfs_spec_bmap(struct vop_bmap_args *ap)
1938 if (ap->a_doffsetp != NULL)
1939 *ap->a_doffsetp = ap->a_loffset;
1940 if (ap->a_runp != NULL)
1941 *ap->a_runp = MAXBSIZE;
1942 if (ap->a_runb != NULL) {
1943 if (ap->a_loffset < MAXBSIZE)
1944 *ap->a_runb = (int)ap->a_loffset;
1946 *ap->a_runb = MAXBSIZE;
1953 * Special device advisory byte-level locks.
1955 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
1956 * struct flock *a_fl, int a_flags)
1960 devfs_spec_advlock(struct vop_advlock_args *ap)
1962 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP);
1966 devfs_spec_getpages_iodone(struct bio *bio)
1968 bio->bio_buf->b_cmd = BUF_CMD_DONE;
1969 wakeup(bio->bio_buf);
1973 * spec_getpages() - get pages associated with device vnode.
1975 * Note that spec_read and spec_write do not use the buffer cache, so we
1976 * must fully implement getpages here.
1979 devfs_spec_getpages(struct vop_getpages_args *ap)
1983 int i, pcount, size;
1986 vm_ooffset_t offset;
1987 int toff, nextoff, nread;
1988 struct vnode *vp = ap->a_vp;
1993 pcount = round_page(ap->a_count) / PAGE_SIZE;
1996 * Calculate the offset of the transfer and do sanity check.
1998 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset;
2001 * Round up physical size for real devices. We cannot round using
2002 * v_mount's block size data because v_mount has nothing to do with
2003 * the device. i.e. it's usually '/dev'. We need the physical block
2004 * size for the device itself.
2006 * We can't use v_rdev->si_mountpoint because it only exists when the
2007 * block device is mounted. However, we can use v_rdev.
2009 if (vn_isdisk(vp, NULL))
2010 blksiz = vp->v_rdev->si_bsize_phys;
2014 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1);
2017 kva = (vm_offset_t)bp->b_data;
2020 * Map the pages to be read into the kva.
2022 pmap_qenter(kva, ap->a_m, pcount);
2024 /* Build a minimal buffer header. */
2025 bp->b_cmd = BUF_CMD_READ;
2026 bp->b_bcount = size;
2028 bp->b_runningbufspace = size;
2030 runningbufspace += bp->b_runningbufspace;
2034 bp->b_bio1.bio_offset = offset;
2035 bp->b_bio1.bio_done = devfs_spec_getpages_iodone;
2037 mycpu->gd_cnt.v_vnodein++;
2038 mycpu->gd_cnt.v_vnodepgsin += pcount;
2041 vn_strategy(ap->a_vp, &bp->b_bio1);
2045 /* We definitely need to be at splbio here. */
2046 while (bp->b_cmd != BUF_CMD_DONE)
2047 tsleep(bp, 0, "spread", 0);
2051 if (bp->b_flags & B_ERROR) {
2053 error = bp->b_error;
2059 * If EOF is encountered we must zero-extend the result in order
2060 * to ensure that the page does not contain garabge. When no
2061 * error occurs, an early EOF is indicated if b_bcount got truncated.
2062 * b_resid is relative to b_bcount and should be 0, but some devices
2063 * might indicate an EOF with b_resid instead of truncating b_bcount.
2065 nread = bp->b_bcount - bp->b_resid;
2066 if (nread < ap->a_count)
2067 bzero((caddr_t)kva + nread, ap->a_count - nread);
2068 pmap_qremove(kva, pcount);
2071 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) {
2072 nextoff = toff + PAGE_SIZE;
2075 m->flags &= ~PG_ZERO;
2078 * NOTE: vm_page_undirty/clear_dirty etc do not clear the
2079 * pmap modified bit. pmap modified bit should have
2080 * already been cleared.
2082 if (nextoff <= nread) {
2083 m->valid = VM_PAGE_BITS_ALL;
2085 } else if (toff < nread) {
2087 * Since this is a VM request, we have to supply the
2088 * unaligned offset to allow vm_page_set_valid()
2089 * to zero sub-DEV_BSIZE'd portions of the page.
2091 vm_page_set_valid(m, 0, nread - toff);
2092 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff);
2098 if (i != ap->a_reqpage) {
2100 * Just in case someone was asking for this page we
2101 * now tell them that it is ok to use.
2103 if (!error || (m->valid == VM_PAGE_BITS_ALL)) {
2105 if (m->flags & PG_WANTED) {
2106 vm_page_activate(m);
2108 vm_page_deactivate(m);
2117 } else if (m->valid) {
2120 * Since this is a VM request, we need to make the
2121 * entire page presentable by zeroing invalid sections.
2123 if (m->valid != VM_PAGE_BITS_ALL)
2124 vm_page_zero_invalid(m, FALSE);
2128 m = ap->a_m[ap->a_reqpage];
2129 devfs_debug(DEVFS_DEBUG_WARNING,
2130 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
2131 devtoname(vp->v_rdev), error, bp, bp->b_vp);
2132 devfs_debug(DEVFS_DEBUG_WARNING,
2133 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n",
2134 size, bp->b_resid, ap->a_count, m->valid);
2135 devfs_debug(DEVFS_DEBUG_WARNING,
2136 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
2137 nread, ap->a_reqpage, (u_long)m->pindex, pcount);
2139 * Free the buffer header back to the swap buffer pool.
2142 return VM_PAGER_ERROR;
2145 * Free the buffer header back to the swap buffer pool.
2148 if (DEVFS_NODE(ap->a_vp))
2149 nanotime(&DEVFS_NODE(ap->a_vp)->mtime);
2155 sequential_heuristic(struct uio *uio, struct file *fp)
2158 * Sequential heuristic - detect sequential operation
2160 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
2161 uio->uio_offset == fp->f_nextoff) {
2163 * XXX we assume that the filesystem block size is
2164 * the default. Not true, but still gives us a pretty
2165 * good indicator of how sequential the read operations
2168 int tmpseq = fp->f_seqcount;
2170 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
2171 if (tmpseq > IO_SEQMAX)
2173 fp->f_seqcount = tmpseq;
2174 return(fp->f_seqcount << IO_SEQSHIFT);
2178 * Not sequential, quick draw-down of seqcount
2180 if (fp->f_seqcount > 1)
2187 extern SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs");
2189 SYSCTL_INT(_vfs_devfs, OID_AUTO, mpsafe_writes, CTLFLAG_RD, &mpsafe_writes,
2190 0, "mpsafe writes");
2191 SYSCTL_INT(_vfs_devfs, OID_AUTO, mplock_writes, CTLFLAG_RD, &mplock_writes,
2192 0, "non-mpsafe writes");
2193 SYSCTL_INT(_vfs_devfs, OID_AUTO, mpsafe_reads, CTLFLAG_RD, &mpsafe_reads,
2195 SYSCTL_INT(_vfs_devfs, OID_AUTO, mplock_reads, CTLFLAG_RD, &mplock_reads,
2196 0, "non-mpsafe reads");