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_nsymlink(struct vop_nsymlink_args
*);
87 static int devfs_nremove(struct vop_nremove_args
*);
89 static int devfs_spec_open(struct vop_open_args
*);
90 static int devfs_spec_close(struct vop_close_args
*);
91 static int devfs_spec_fsync(struct vop_fsync_args
*);
93 static int devfs_spec_read(struct vop_read_args
*);
94 static int devfs_spec_write(struct vop_write_args
*);
95 static int devfs_spec_ioctl(struct vop_ioctl_args
*);
96 static int devfs_spec_poll(struct vop_poll_args
*);
97 static int devfs_spec_kqfilter(struct vop_kqfilter_args
*);
98 static int devfs_spec_strategy(struct vop_strategy_args
*);
99 static void devfs_spec_strategy_done(struct bio
*);
100 static int devfs_spec_freeblks(struct vop_freeblks_args
*);
101 static int devfs_spec_bmap(struct vop_bmap_args
*);
102 static int devfs_spec_advlock(struct vop_advlock_args
*);
103 static void devfs_spec_getpages_iodone(struct bio
*);
104 static int devfs_spec_getpages(struct vop_getpages_args
*);
107 static int devfs_specf_close(struct file
*);
108 static int devfs_specf_read(struct file
*, struct uio
*, struct ucred
*, int);
109 static int devfs_specf_write(struct file
*, struct uio
*, struct ucred
*, int);
110 static int devfs_specf_stat(struct file
*, struct stat
*, struct ucred
*);
111 static int devfs_specf_kqfilter(struct file
*, struct knote
*);
112 static int devfs_specf_poll(struct file
*, int, struct ucred
*);
113 static int devfs_specf_ioctl(struct file
*, u_long
, caddr_t
,
114 struct ucred
*, struct sysmsg
*);
115 static __inline
int sequential_heuristic(struct uio
*, struct file
*);
117 extern struct lock devfs_lock
;
119 static int mpsafe_reads
, mpsafe_writes
, mplock_reads
, mplock_writes
;
122 * devfs vnode operations for regular files
124 struct vop_ops devfs_vnode_norm_vops
= {
125 .vop_default
= vop_defaultop
,
126 .vop_access
= devfs_access
,
127 .vop_advlock
= DEVFS_BADOP
,
128 .vop_bmap
= DEVFS_BADOP
,
129 .vop_close
= vop_stdclose
,
130 .vop_getattr
= devfs_getattr
,
131 .vop_inactive
= devfs_inactive
,
132 .vop_ncreate
= DEVFS_BADOP
,
133 .vop_nresolve
= devfs_nresolve
,
134 .vop_nlookupdotdot
= devfs_nlookupdotdot
,
135 .vop_nlink
= DEVFS_BADOP
,
136 .vop_nmkdir
= DEVFS_BADOP
,
137 .vop_nmknod
= DEVFS_BADOP
,
138 .vop_nremove
= devfs_nremove
,
139 .vop_nrename
= DEVFS_BADOP
,
140 .vop_nrmdir
= DEVFS_BADOP
,
141 .vop_nsymlink
= devfs_nsymlink
,
142 .vop_open
= vop_stdopen
,
143 .vop_pathconf
= vop_stdpathconf
,
144 .vop_print
= devfs_print
,
145 .vop_read
= DEVFS_BADOP
,
146 .vop_readdir
= devfs_readdir
,
147 .vop_readlink
= devfs_readlink
,
148 .vop_reclaim
= devfs_reclaim
,
149 .vop_setattr
= devfs_setattr
,
150 .vop_write
= DEVFS_BADOP
,
151 .vop_ioctl
= DEVFS_BADOP
155 * devfs vnode operations for character devices
157 struct vop_ops devfs_vnode_dev_vops
= {
158 .vop_default
= vop_defaultop
,
159 .vop_access
= devfs_access
,
160 .vop_advlock
= devfs_spec_advlock
,
161 .vop_bmap
= devfs_spec_bmap
,
162 .vop_close
= devfs_spec_close
,
163 .vop_freeblks
= devfs_spec_freeblks
,
164 .vop_fsync
= devfs_spec_fsync
,
165 .vop_getattr
= devfs_getattr
,
166 .vop_getpages
= devfs_spec_getpages
,
167 .vop_inactive
= devfs_inactive
,
168 .vop_open
= devfs_spec_open
,
169 .vop_pathconf
= vop_stdpathconf
,
170 .vop_print
= devfs_print
,
171 .vop_poll
= devfs_spec_poll
,
172 .vop_kqfilter
= devfs_spec_kqfilter
,
173 .vop_read
= devfs_spec_read
,
174 .vop_readdir
= DEVFS_BADOP
,
175 .vop_readlink
= DEVFS_BADOP
,
176 .vop_reclaim
= devfs_reclaim
,
177 .vop_setattr
= devfs_setattr
,
178 .vop_strategy
= devfs_spec_strategy
,
179 .vop_write
= devfs_spec_write
,
180 .vop_ioctl
= devfs_spec_ioctl
183 struct vop_ops
*devfs_vnode_dev_vops_p
= &devfs_vnode_dev_vops
;
185 struct fileops devfs_dev_fileops
= {
186 .fo_read
= devfs_specf_read
,
187 .fo_write
= devfs_specf_write
,
188 .fo_ioctl
= devfs_specf_ioctl
,
189 .fo_poll
= devfs_specf_poll
,
190 .fo_kqfilter
= devfs_specf_kqfilter
,
191 .fo_stat
= devfs_specf_stat
,
192 .fo_close
= devfs_specf_close
,
193 .fo_shutdown
= nofo_shutdown
197 * These two functions are possibly temporary hacks for
198 * devices (aka the pty code) which want to control the
199 * node attributes themselves.
201 * XXX we may ultimately desire to simply remove the uid/gid/mode
202 * from the node entirely.
205 node_sync_dev_get(struct devfs_node
*node
)
209 if ((dev
= node
->d_dev
) && (dev
->si_flags
& SI_OVERRIDE
)) {
210 node
->uid
= dev
->si_uid
;
211 node
->gid
= dev
->si_gid
;
212 node
->mode
= dev
->si_perms
;
217 node_sync_dev_set(struct devfs_node
*node
)
221 if ((dev
= node
->d_dev
) && (dev
->si_flags
& SI_OVERRIDE
)) {
222 dev
->si_uid
= node
->uid
;
223 dev
->si_gid
= node
->gid
;
224 dev
->si_perms
= node
->mode
;
229 * generic entry point for unsupported operations
232 devfs_badop(struct vop_generic_args
*ap
)
239 devfs_access(struct vop_access_args
*ap
)
241 struct devfs_node
*node
= DEVFS_NODE(ap
->a_vp
);
244 if (!devfs_node_is_accessible(node
))
246 node_sync_dev_get(node
);
247 error
= vop_helper_access(ap
, node
->uid
, node
->gid
,
248 node
->mode
, node
->flags
);
255 devfs_inactive(struct vop_inactive_args
*ap
)
257 struct devfs_node
*node
= DEVFS_NODE(ap
->a_vp
);
259 if (node
== NULL
|| (node
->flags
& DEVFS_NODE_LINKED
) == 0)
266 devfs_reclaim(struct vop_reclaim_args
*ap
)
268 struct devfs_node
*node
;
273 * Check if it is locked already. if not, we acquire the devfs lock
275 if (!(lockstatus(&devfs_lock
, curthread
)) == LK_EXCLUSIVE
) {
276 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
283 * Get rid of the devfs_node if it is no longer linked into the
287 if ((node
= DEVFS_NODE(vp
)) != NULL
) {
289 if ((node
->flags
& DEVFS_NODE_LINKED
) == 0)
294 lockmgr(&devfs_lock
, LK_RELEASE
);
297 * v_rdev needs to be properly released using v_release_rdev
298 * Make sure v_data is NULL as well.
307 devfs_readdir(struct vop_readdir_args
*ap
)
309 struct devfs_node
*dnode
= DEVFS_NODE(ap
->a_vp
);
310 struct devfs_node
*node
;
319 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_readdir() called!\n");
321 if (ap
->a_uio
->uio_offset
< 0 || ap
->a_uio
->uio_offset
> INT_MAX
)
323 if ((error
= vn_lock(ap
->a_vp
, LK_EXCLUSIVE
| LK_RETRY
)) != 0)
326 if (!devfs_node_is_accessible(dnode
)) {
331 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
333 saveoff
= ap
->a_uio
->uio_offset
;
335 if (ap
->a_ncookies
) {
336 ncookies
= ap
->a_uio
->uio_resid
/ 16 + 1; /* Why / 16 ?? */
339 cookies
= kmalloc(256 * sizeof(off_t
), M_TEMP
, M_WAITOK
);
347 nanotime(&dnode
->atime
);
350 r
= vop_write_dirent(&error
, ap
->a_uio
, dnode
->d_dir
.d_ino
,
355 cookies
[cookie_index
] = saveoff
;
358 if (cookie_index
== ncookies
)
364 r
= vop_write_dirent(&error
, ap
->a_uio
,
365 dnode
->parent
->d_dir
.d_ino
,
368 r
= vop_write_dirent(&error
, ap
->a_uio
,
375 cookies
[cookie_index
] = saveoff
;
378 if (cookie_index
== ncookies
)
382 TAILQ_FOREACH(node
, DEVFS_DENODE_HEAD(dnode
), link
) {
383 if ((node
->flags
& DEVFS_HIDDEN
) ||
384 (node
->flags
& DEVFS_INVISIBLE
)) {
389 * If the node type is a valid devfs alias, then we make sure that the
390 * target isn't hidden. If it is, we don't show the link in the
393 if ((node
->node_type
== Plink
) && (node
->link_target
!= NULL
) &&
394 (node
->link_target
->flags
& DEVFS_HIDDEN
))
397 if (node
->cookie
< saveoff
)
400 saveoff
= node
->cookie
;
402 error2
= vop_write_dirent(&error
, ap
->a_uio
, node
->d_dir
.d_ino
,
404 node
->d_dir
.d_namlen
,
413 cookies
[cookie_index
] = node
->cookie
;
415 if (cookie_index
== ncookies
)
420 lockmgr(&devfs_lock
, LK_RELEASE
);
423 ap
->a_uio
->uio_offset
= saveoff
;
424 if (error
&& cookie_index
== 0) {
426 kfree(cookies
, M_TEMP
);
428 *ap
->a_cookies
= NULL
;
432 *ap
->a_ncookies
= cookie_index
;
433 *ap
->a_cookies
= cookies
;
441 devfs_nresolve(struct vop_nresolve_args
*ap
)
443 struct devfs_node
*dnode
= DEVFS_NODE(ap
->a_dvp
);
444 struct devfs_node
*node
, *found
= NULL
;
445 struct namecache
*ncp
;
446 struct vnode
*vp
= NULL
;
451 ncp
= ap
->a_nch
->ncp
;
454 if (!devfs_node_is_accessible(dnode
))
457 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
459 if ((dnode
->node_type
!= Proot
) && (dnode
->node_type
!= Pdir
)) {
461 cache_setvp(ap
->a_nch
, NULL
);
465 TAILQ_FOREACH(node
, DEVFS_DENODE_HEAD(dnode
), link
) {
466 if (len
== node
->d_dir
.d_namlen
) {
467 if (!memcmp(ncp
->nc_name
, node
->d_dir
.d_name
, len
)) {
476 while ((found
->node_type
== Plink
) && (found
->link_target
)) {
478 devfs_debug(DEVFS_DEBUG_SHOW
, "Recursive link or depth >= 8");
482 found
= found
->link_target
;
486 if (!(found
->flags
& DEVFS_HIDDEN
))
487 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp
, found
);
492 cache_setvp(ap
->a_nch
, NULL
);
498 cache_setvp(ap
->a_nch
, vp
);
501 lockmgr(&devfs_lock
, LK_RELEASE
);
508 devfs_nlookupdotdot(struct vop_nlookupdotdot_args
*ap
)
510 struct devfs_node
*dnode
= DEVFS_NODE(ap
->a_dvp
);
513 if (!devfs_node_is_accessible(dnode
))
516 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
517 if (dnode
->parent
!= NULL
) {
518 devfs_allocv(ap
->a_vpp
, dnode
->parent
);
519 vn_unlock(*ap
->a_vpp
);
521 lockmgr(&devfs_lock
, LK_RELEASE
);
523 return ((*ap
->a_vpp
== NULL
) ? ENOENT
: 0);
528 devfs_getattr(struct vop_getattr_args
*ap
)
530 struct devfs_node
*node
= DEVFS_NODE(ap
->a_vp
);
531 struct vattr
*vap
= ap
->a_vap
;
532 struct partinfo pinfo
;
536 if (!devfs_node_is_accessible(node
))
539 node_sync_dev_get(node
);
541 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
543 /* start by zeroing out the attributes */
546 /* next do all the common fields */
547 vap
->va_type
= ap
->a_vp
->v_type
;
548 vap
->va_mode
= node
->mode
;
549 vap
->va_fileid
= DEVFS_NODE(ap
->a_vp
)->d_dir
.d_ino
;
550 vap
->va_flags
= 0; /* XXX: what should this be? */
551 vap
->va_blocksize
= DEV_BSIZE
;
552 vap
->va_bytes
= vap
->va_size
= sizeof(struct devfs_node
);
554 vap
->va_fsid
= ap
->a_vp
->v_mount
->mnt_stat
.f_fsid
.val
[0];
556 vap
->va_atime
= node
->atime
;
557 vap
->va_mtime
= node
->mtime
;
558 vap
->va_ctime
= node
->ctime
;
560 vap
->va_nlink
= 1; /* number of references to file */
562 vap
->va_uid
= node
->uid
;
563 vap
->va_gid
= node
->gid
;
568 if ((node
->node_type
== Pdev
) && node
->d_dev
) {
569 reference_dev(node
->d_dev
);
570 vap
->va_rminor
= node
->d_dev
->si_uminor
;
571 release_dev(node
->d_dev
);
574 /* For a softlink the va_size is the length of the softlink */
575 if (node
->symlink_name
!= 0) {
576 vap
->va_bytes
= vap
->va_size
= node
->symlink_namelen
;
580 * For a disk-type device, va_size is the size of the underlying
581 * device, so that lseek() works properly.
583 if ((node
->d_dev
) && (dev_dflags(node
->d_dev
) & D_DISK
)) {
584 bzero(&pinfo
, sizeof(pinfo
));
585 error
= dev_dioctl(node
->d_dev
, DIOCGPART
, (void *)&pinfo
,
586 0, proc0
.p_ucred
, NULL
);
587 if ((error
== 0) && (pinfo
.media_blksize
!= 0)) {
588 vap
->va_size
= pinfo
.media_size
;
595 lockmgr(&devfs_lock
, LK_RELEASE
);
602 devfs_setattr(struct vop_setattr_args
*ap
)
604 struct devfs_node
*node
= DEVFS_NODE(ap
->a_vp
);
608 if (!devfs_node_is_accessible(node
))
610 node_sync_dev_get(node
);
612 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
616 if (vap
->va_uid
!= (uid_t
)VNOVAL
) {
617 if ((ap
->a_cred
->cr_uid
!= node
->uid
) &&
618 (!groupmember(node
->gid
, ap
->a_cred
))) {
619 error
= priv_check(curthread
, PRIV_VFS_CHOWN
);
623 node
->uid
= vap
->va_uid
;
626 if (vap
->va_gid
!= (uid_t
)VNOVAL
) {
627 if ((ap
->a_cred
->cr_uid
!= node
->uid
) &&
628 (!groupmember(node
->gid
, ap
->a_cred
))) {
629 error
= priv_check(curthread
, PRIV_VFS_CHOWN
);
633 node
->gid
= vap
->va_gid
;
636 if (vap
->va_mode
!= (mode_t
)VNOVAL
) {
637 if (ap
->a_cred
->cr_uid
!= node
->uid
) {
638 error
= priv_check(curthread
, PRIV_VFS_ADMIN
);
642 node
->mode
= vap
->va_mode
;
646 node_sync_dev_set(node
);
647 nanotime(&node
->ctime
);
648 lockmgr(&devfs_lock
, LK_RELEASE
);
655 devfs_readlink(struct vop_readlink_args
*ap
)
657 struct devfs_node
*node
= DEVFS_NODE(ap
->a_vp
);
660 if (!devfs_node_is_accessible(node
))
663 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
664 ret
= uiomove(node
->symlink_name
, node
->symlink_namelen
, ap
->a_uio
);
665 lockmgr(&devfs_lock
, LK_RELEASE
);
672 devfs_print(struct vop_print_args
*ap
)
679 devfs_nsymlink(struct vop_nsymlink_args
*ap
)
681 struct devfs_node
*dnode
= DEVFS_NODE(ap
->a_dvp
);
682 struct devfs_node
*node
;
685 if (!devfs_node_is_accessible(dnode
))
688 ap
->a_vap
->va_type
= VLNK
;
690 if ((dnode
->node_type
!= Proot
) && (dnode
->node_type
!= Pdir
))
693 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
694 devfs_allocvp(ap
->a_dvp
->v_mount
, ap
->a_vpp
, Plink
,
695 ap
->a_nch
->ncp
->nc_name
, dnode
, NULL
);
697 targetlen
= strlen(ap
->a_target
);
699 node
= DEVFS_NODE(*ap
->a_vpp
);
700 node
->flags
|= DEVFS_USER_CREATED
;
701 node
->symlink_namelen
= targetlen
;
702 node
->symlink_name
= kmalloc(targetlen
+ 1, M_DEVFS
, M_WAITOK
);
703 memcpy(node
->symlink_name
, ap
->a_target
, targetlen
);
704 node
->symlink_name
[targetlen
] = '\0';
705 cache_setunresolved(ap
->a_nch
);
706 cache_setvp(ap
->a_nch
, *ap
->a_vpp
);
708 lockmgr(&devfs_lock
, LK_RELEASE
);
710 return ((*ap
->a_vpp
== NULL
) ? ENOTDIR
: 0);
715 devfs_nremove(struct vop_nremove_args
*ap
)
717 struct devfs_node
*dnode
= DEVFS_NODE(ap
->a_dvp
);
718 struct devfs_node
*node
;
719 struct namecache
*ncp
;
722 ncp
= ap
->a_nch
->ncp
;
724 if (!devfs_node_is_accessible(dnode
))
727 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
729 if ((dnode
->node_type
!= Proot
) && (dnode
->node_type
!= Pdir
))
732 TAILQ_FOREACH(node
, DEVFS_DENODE_HEAD(dnode
), link
) {
733 if (ncp
->nc_nlen
!= node
->d_dir
.d_namlen
)
735 if (memcmp(ncp
->nc_name
, node
->d_dir
.d_name
, ncp
->nc_nlen
))
739 * only allow removal of user created stuff (e.g. symlinks)
741 if ((node
->flags
& DEVFS_USER_CREATED
) == 0) {
746 cache_inval_vp(node
->v_node
, CINV_DESTROY
);
753 cache_setunresolved(ap
->a_nch
);
754 cache_setvp(ap
->a_nch
, NULL
);
757 lockmgr(&devfs_lock
, LK_RELEASE
);
763 devfs_spec_open(struct vop_open_args
*ap
)
765 struct vnode
*vp
= ap
->a_vp
;
766 struct vnode
*orig_vp
= NULL
;
767 struct devfs_node
*node
= DEVFS_NODE(vp
);
768 struct devfs_node
*newnode
;
769 cdev_t dev
, ndev
= NULL
;
773 if (node
->d_dev
== NULL
)
775 if (!devfs_node_is_accessible(node
))
779 if ((dev
= vp
->v_rdev
) == NULL
)
782 if (node
&& ap
->a_fp
) {
783 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_spec_open: -1.1-\n");
784 lockmgr(&devfs_lock
, LK_EXCLUSIVE
);
786 ndev
= devfs_clone(dev
, node
->d_dir
.d_name
, node
->d_dir
.d_namlen
,
787 ap
->a_mode
, ap
->a_cred
);
789 newnode
= devfs_create_device_node(
790 DEVFS_MNTDATA(vp
->v_mount
)->root_node
,
792 /* XXX: possibly destroy device if this happens */
794 if (newnode
!= NULL
) {
798 devfs_debug(DEVFS_DEBUG_DEBUG
,
799 "parent here is: %s, node is: |%s|\n",
800 ((node
->parent
->node_type
== Proot
) ?
801 "ROOT!" : node
->parent
->d_dir
.d_name
),
802 newnode
->d_dir
.d_name
);
803 devfs_debug(DEVFS_DEBUG_DEBUG
,
805 ((struct devfs_node
*)(TAILQ_LAST(DEVFS_DENODE_HEAD(node
->parent
), devfs_node_head
)))->d_dir
.d_name
);
808 * orig_vp is set to the original vp if we cloned.
810 /* node->flags |= DEVFS_CLONED; */
811 devfs_allocv(&vp
, newnode
);
816 lockmgr(&devfs_lock
, LK_RELEASE
);
819 devfs_debug(DEVFS_DEBUG_DEBUG
,
820 "devfs_spec_open() called on %s! \n",
824 * Make this field valid before any I/O in ->d_open
826 if (!dev
->si_iosize_max
)
827 dev
->si_iosize_max
= DFLTPHYS
;
829 if (dev_dflags(dev
) & D_TTY
)
830 vsetflags(vp
, VISTTY
);
833 error
= dev_dopen(dev
, ap
->a_mode
, S_IFCHR
, ap
->a_cred
);
834 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
837 * Clean up any cloned vp if we error out.
843 /* orig_vp = NULL; */
849 * This checks if the disk device is going to be opened for writing.
850 * It will be only allowed in the cases where securelevel permits it
851 * and it's not mounted R/W.
853 if ((dev_dflags(dev
) & D_DISK
) && (ap
->a_mode
& FWRITE
) &&
854 (ap
->a_cred
!= FSCRED
)) {
856 /* Very secure mode. No open for writing allowed */
857 if (securelevel
>= 2)
861 * If it is mounted R/W, do not allow to open for writing.
862 * In the case it's mounted read-only but securelevel
863 * is >= 1, then do not allow opening for writing either.
865 if (vfs_mountedon(vp
)) {
866 if (!(dev
->si_mountpoint
->mnt_flag
& MNT_RDONLY
))
868 else if (securelevel
>= 1)
873 if (dev_dflags(dev
) & D_TTY
) {
878 devfs_debug(DEVFS_DEBUG_DEBUG
,
879 "devfs: no t_stop\n");
880 tp
->t_stop
= nottystop
;
886 if (vn_isdisk(vp
, NULL
)) {
887 if (!dev
->si_bsize_phys
)
888 dev
->si_bsize_phys
= DEV_BSIZE
;
889 vinitvmio(vp
, IDX_TO_OFF(INT_MAX
));
895 nanotime(&node
->atime
);
901 /* Ugly pty magic, to make pty devices appear once they are opened */
902 if (node
&& (node
->flags
& DEVFS_PTY
) == DEVFS_PTY
)
903 node
->flags
&= ~DEVFS_INVISIBLE
;
906 ap
->a_fp
->f_type
= DTYPE_VNODE
;
907 ap
->a_fp
->f_flag
= ap
->a_mode
& FMASK
;
908 ap
->a_fp
->f_ops
= &devfs_dev_fileops
;
909 ap
->a_fp
->f_data
= vp
;
917 devfs_spec_close(struct vop_close_args
*ap
)
919 struct devfs_node
*node
= DEVFS_NODE(ap
->a_vp
);
920 struct proc
*p
= curproc
;
921 struct vnode
*vp
= ap
->a_vp
;
922 cdev_t dev
= vp
->v_rdev
;
926 devfs_debug(DEVFS_DEBUG_DEBUG
,
927 "devfs_spec_close() called on %s! \n",
931 * A couple of hacks for devices and tty devices. The
932 * vnode ref count cannot be used to figure out the
933 * last close, but we can use v_opencount now that
934 * revoke works properly.
936 * Detect the last close on a controlling terminal and clear
937 * the session (half-close).
942 if (p
&& vp
->v_opencount
<= 1 && vp
== p
->p_session
->s_ttyvp
) {
943 p
->p_session
->s_ttyvp
= NULL
;
948 * Vnodes can be opened and closed multiple times. Do not really
949 * close the device unless (1) it is being closed forcibly,
950 * (2) the device wants to track closes, or (3) this is the last
951 * vnode doing its last close on the device.
953 * XXX the VXLOCK (force close) case can leave vnodes referencing
954 * a closed device. This might not occur now that our revoke is
957 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_spec_close() -1- \n");
958 if (dev
&& ((vp
->v_flag
& VRECLAIMED
) ||
959 (dev_dflags(dev
) & D_TRACKCLOSE
) ||
960 (vp
->v_opencount
== 1))) {
962 * Unlock around dev_dclose()
965 if (vn_islocked(vp
)) {
969 error
= dev_dclose(dev
, ap
->a_fflag
, S_IFCHR
);
972 * Ugly pty magic, to make pty devices disappear again once
975 if (node
&& (node
->flags
& DEVFS_PTY
) == DEVFS_PTY
)
976 node
->flags
|= DEVFS_INVISIBLE
;
979 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
983 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_spec_close() -2- \n");
986 * Track the actual opens and closes on the vnode. The last close
987 * disassociates the rdev. If the rdev is already disassociated or
988 * the opencount is already 0, the vnode might have been revoked
989 * and no further opencount tracking occurs.
993 if (vp
->v_opencount
> 0)
1001 devfs_specf_close(struct file
*fp
)
1003 struct vnode
*vp
= (struct vnode
*)fp
->f_data
;
1007 fp
->f_ops
= &badfileops
;
1008 error
= vn_close(vp
, fp
->f_flag
);
1016 * Device-optimized file table vnode read routine.
1018 * This bypasses the VOP table and talks directly to the device. Most
1019 * filesystems just route to specfs and can make this optimization.
1021 * MPALMOSTSAFE - acquires mplock
1024 devfs_specf_read(struct file
*fp
, struct uio
*uio
,
1025 struct ucred
*cred
, int flags
)
1027 struct devfs_node
*node
;
1033 KASSERT(uio
->uio_td
== curthread
,
1034 ("uio_td %p is not td %p", uio
->uio_td
, curthread
));
1036 if (uio
->uio_resid
== 0)
1039 vp
= (struct vnode
*)fp
->f_data
;
1040 if (vp
== NULL
|| vp
->v_type
== VBAD
)
1043 node
= DEVFS_NODE(vp
);
1045 if ((dev
= vp
->v_rdev
) == NULL
)
1048 /* only acquire mplock for devices that require it */
1049 if (!(dev_dflags(dev
) & D_MPSAFE_READ
)) {
1050 atomic_add_int(&mplock_reads
, 1);
1053 atomic_add_int(&mpsafe_reads
, 1);
1058 if ((flags
& O_FOFFSET
) == 0)
1059 uio
->uio_offset
= fp
->f_offset
;
1062 if (flags
& O_FBLOCKING
) {
1063 /* ioflag &= ~IO_NDELAY; */
1064 } else if (flags
& O_FNONBLOCKING
) {
1065 ioflag
|= IO_NDELAY
;
1066 } else if (fp
->f_flag
& FNONBLOCK
) {
1067 ioflag
|= IO_NDELAY
;
1069 if (flags
& O_FBUFFERED
) {
1070 /* ioflag &= ~IO_DIRECT; */
1071 } else if (flags
& O_FUNBUFFERED
) {
1072 ioflag
|= IO_DIRECT
;
1073 } else if (fp
->f_flag
& O_DIRECT
) {
1074 ioflag
|= IO_DIRECT
;
1076 ioflag
|= sequential_heuristic(uio
, fp
);
1078 error
= dev_dread(dev
, uio
, ioflag
);
1082 nanotime(&node
->atime
);
1083 if ((flags
& O_FOFFSET
) == 0)
1084 fp
->f_offset
= uio
->uio_offset
;
1085 fp
->f_nextoff
= uio
->uio_offset
;
1087 if (!(dev_dflags(dev
) & D_MPSAFE_READ
))
1095 devfs_specf_write(struct file
*fp
, struct uio
*uio
,
1096 struct ucred
*cred
, int flags
)
1098 struct devfs_node
*node
;
1104 KASSERT(uio
->uio_td
== curthread
,
1105 ("uio_td %p is not p %p", uio
->uio_td
, curthread
));
1107 vp
= (struct vnode
*)fp
->f_data
;
1108 if (vp
== NULL
|| vp
->v_type
== VBAD
)
1111 node
= DEVFS_NODE(vp
);
1113 if (vp
->v_type
== VREG
)
1114 bwillwrite(uio
->uio_resid
);
1116 vp
= (struct vnode
*)fp
->f_data
;
1118 if ((dev
= vp
->v_rdev
) == NULL
)
1121 /* only acquire mplock for devices that require it */
1122 if (!(dev_dflags(dev
) & D_MPSAFE_WRITE
)) {
1123 atomic_add_int(&mplock_writes
, 1);
1126 atomic_add_int(&mpsafe_writes
, 1);
1131 if ((flags
& O_FOFFSET
) == 0)
1132 uio
->uio_offset
= fp
->f_offset
;
1135 if (vp
->v_type
== VREG
&&
1136 ((fp
->f_flag
& O_APPEND
) || (flags
& O_FAPPEND
))) {
1137 ioflag
|= IO_APPEND
;
1140 if (flags
& O_FBLOCKING
) {
1141 /* ioflag &= ~IO_NDELAY; */
1142 } else if (flags
& O_FNONBLOCKING
) {
1143 ioflag
|= IO_NDELAY
;
1144 } else if (fp
->f_flag
& FNONBLOCK
) {
1145 ioflag
|= IO_NDELAY
;
1147 if (flags
& O_FBUFFERED
) {
1148 /* ioflag &= ~IO_DIRECT; */
1149 } else if (flags
& O_FUNBUFFERED
) {
1150 ioflag
|= IO_DIRECT
;
1151 } else if (fp
->f_flag
& O_DIRECT
) {
1152 ioflag
|= IO_DIRECT
;
1154 if (flags
& O_FASYNCWRITE
) {
1155 /* ioflag &= ~IO_SYNC; */
1156 } else if (flags
& O_FSYNCWRITE
) {
1158 } else if (fp
->f_flag
& O_FSYNC
) {
1162 if (vp
->v_mount
&& (vp
->v_mount
->mnt_flag
& MNT_SYNCHRONOUS
))
1164 ioflag
|= sequential_heuristic(uio
, fp
);
1166 error
= dev_dwrite(dev
, uio
, ioflag
);
1170 nanotime(&node
->atime
);
1171 nanotime(&node
->mtime
);
1174 if ((flags
& O_FOFFSET
) == 0)
1175 fp
->f_offset
= uio
->uio_offset
;
1176 fp
->f_nextoff
= uio
->uio_offset
;
1178 if (!(dev_dflags(dev
) & D_MPSAFE_WRITE
))
1185 devfs_specf_stat(struct file
*fp
, struct stat
*sb
, struct ucred
*cred
)
1194 vp
= (struct vnode
*)fp
->f_data
;
1195 if (vp
== NULL
|| vp
->v_type
== VBAD
)
1198 error
= vn_stat(vp
, sb
, cred
);
1203 error
= VOP_GETATTR(vp
, vap
);
1208 * Zero the spare stat fields
1215 * Copy from vattr table ... or not in case it's a cloned device
1217 if (vap
->va_fsid
!= VNOVAL
)
1218 sb
->st_dev
= vap
->va_fsid
;
1220 sb
->st_dev
= vp
->v_mount
->mnt_stat
.f_fsid
.val
[0];
1222 sb
->st_ino
= vap
->va_fileid
;
1224 mode
= vap
->va_mode
;
1228 if (vap
->va_nlink
> (nlink_t
)-1)
1229 sb
->st_nlink
= (nlink_t
)-1;
1231 sb
->st_nlink
= vap
->va_nlink
;
1233 sb
->st_uid
= vap
->va_uid
;
1234 sb
->st_gid
= vap
->va_gid
;
1235 sb
->st_rdev
= dev2udev(DEVFS_NODE(vp
)->d_dev
);
1236 sb
->st_size
= vap
->va_bytes
;
1237 sb
->st_atimespec
= vap
->va_atime
;
1238 sb
->st_mtimespec
= vap
->va_mtime
;
1239 sb
->st_ctimespec
= vap
->va_ctime
;
1242 * A VCHR and VBLK device may track the last access and last modified
1243 * time independantly of the filesystem. This is particularly true
1244 * because device read and write calls may bypass the filesystem.
1246 if (vp
->v_type
== VCHR
|| vp
->v_type
== VBLK
) {
1249 if (dev
->si_lastread
) {
1250 sb
->st_atimespec
.tv_sec
= dev
->si_lastread
;
1251 sb
->st_atimespec
.tv_nsec
= 0;
1253 if (dev
->si_lastwrite
) {
1254 sb
->st_atimespec
.tv_sec
= dev
->si_lastwrite
;
1255 sb
->st_atimespec
.tv_nsec
= 0;
1261 * According to www.opengroup.org, the meaning of st_blksize is
1262 * "a filesystem-specific preferred I/O block size for this
1263 * object. In some filesystem types, this may vary from file
1265 * Default to PAGE_SIZE after much discussion.
1268 sb
->st_blksize
= PAGE_SIZE
;
1270 sb
->st_flags
= vap
->va_flags
;
1272 error
= priv_check_cred(cred
, PRIV_VFS_GENERATION
, 0);
1276 sb
->st_gen
= (u_int32_t
)vap
->va_gen
;
1278 sb
->st_blocks
= vap
->va_bytes
/ S_BLKSIZE
;
1285 devfs_specf_kqfilter(struct file
*fp
, struct knote
*kn
)
1293 vp
= (struct vnode
*)fp
->f_data
;
1294 if (vp
== NULL
|| vp
->v_type
== VBAD
) {
1298 if ((dev
= vp
->v_rdev
) == NULL
) {
1304 error
= dev_dkqfilter(dev
, kn
);
1315 devfs_specf_poll(struct file
*fp
, int events
, struct ucred
*cred
)
1317 struct devfs_node
*node
;
1324 vp
= (struct vnode
*)fp
->f_data
;
1325 if (vp
== NULL
|| vp
->v_type
== VBAD
) {
1329 node
= DEVFS_NODE(vp
);
1331 if ((dev
= vp
->v_rdev
) == NULL
) {
1336 error
= dev_dpoll(dev
, events
);
1342 nanotime(&node
->atime
);
1351 * MPALMOSTSAFE - acquires mplock
1354 devfs_specf_ioctl(struct file
*fp
, u_long com
, caddr_t data
,
1355 struct ucred
*ucred
, struct sysmsg
*msg
)
1357 struct devfs_node
*node
;
1362 struct fiodname_args
*name_args
;
1366 vp
= ((struct vnode
*)fp
->f_data
);
1368 if ((dev
= vp
->v_rdev
) == NULL
)
1369 return EBADF
; /* device was revoked */
1373 node
= DEVFS_NODE(vp
);
1375 devfs_debug(DEVFS_DEBUG_DEBUG
,
1376 "devfs_specf_ioctl() called! for dev %s\n",
1379 if (com
== FIODTYPE
) {
1380 *(int *)data
= dev_dflags(dev
) & D_TYPEMASK
;
1383 } else if (com
== FIODNAME
) {
1384 name_args
= (struct fiodname_args
*)data
;
1385 name
= dev
->si_name
;
1386 namlen
= strlen(name
) + 1;
1388 devfs_debug(DEVFS_DEBUG_DEBUG
,
1389 "ioctl, got: FIODNAME for %s\n", name
);
1391 if (namlen
<= name_args
->len
)
1392 error
= copyout(dev
->si_name
, name_args
->name
, namlen
);
1396 devfs_debug(DEVFS_DEBUG_DEBUG
,
1397 "ioctl stuff: error: %d\n", error
);
1401 /* only acquire mplock for devices that require it */
1402 if (!(dev_dflags(dev
) & D_MPSAFE_IOCTL
))
1405 error
= dev_dioctl(dev
, com
, data
, fp
->f_flag
, ucred
, msg
);
1409 nanotime(&node
->atime
);
1410 nanotime(&node
->mtime
);
1414 if (!(dev_dflags(dev
) & D_MPSAFE_IOCTL
))
1417 if (com
== TIOCSCTTY
) {
1418 devfs_debug(DEVFS_DEBUG_DEBUG
,
1419 "devfs_specf_ioctl: got TIOCSCTTY on %s\n",
1422 if (error
== 0 && com
== TIOCSCTTY
) {
1423 struct proc
*p
= curthread
->td_proc
;
1424 struct session
*sess
;
1426 devfs_debug(DEVFS_DEBUG_DEBUG
,
1427 "devfs_specf_ioctl: dealing with TIOCSCTTY on %s\n",
1433 sess
= p
->p_session
;
1436 * Do nothing if reassigning same control tty
1438 if (sess
->s_ttyvp
== vp
) {
1444 * Get rid of reference to old control tty
1446 ovp
= sess
->s_ttyvp
;
1455 devfs_debug(DEVFS_DEBUG_DEBUG
, "devfs_specf_ioctl() finished! \n");
1461 devfs_spec_fsync(struct vop_fsync_args
*ap
)
1463 struct vnode
*vp
= ap
->a_vp
;
1466 if (!vn_isdisk(vp
, NULL
))
1470 * Flush all dirty buffers associated with a block device.
1472 error
= vfsync(vp
, ap
->a_waitfor
, 10000, NULL
, NULL
);
1477 devfs_spec_read(struct vop_read_args
*ap
)
1479 struct devfs_node
*node
;
1488 node
= DEVFS_NODE(vp
);
1490 if (dev
== NULL
) /* device was revoked */
1492 if (uio
->uio_resid
== 0)
1496 error
= dev_dread(dev
, uio
, ap
->a_ioflag
);
1497 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
1500 nanotime(&node
->atime
);
1506 * Vnode op for write
1508 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
1509 * struct ucred *a_cred)
1512 devfs_spec_write(struct vop_write_args
*ap
)
1514 struct devfs_node
*node
;
1523 node
= DEVFS_NODE(vp
);
1525 KKASSERT(uio
->uio_segflg
!= UIO_NOCOPY
);
1527 if (dev
== NULL
) /* device was revoked */
1531 error
= dev_dwrite(dev
, uio
, ap
->a_ioflag
);
1532 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
1535 nanotime(&node
->atime
);
1536 nanotime(&node
->mtime
);
1543 * Device ioctl operation.
1545 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
1546 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg)
1549 devfs_spec_ioctl(struct vop_ioctl_args
*ap
)
1551 struct vnode
*vp
= ap
->a_vp
;
1552 struct devfs_node
*node
;
1555 if ((dev
= vp
->v_rdev
) == NULL
)
1556 return (EBADF
); /* device was revoked */
1557 node
= DEVFS_NODE(vp
);
1561 nanotime(&node
->atime
);
1562 nanotime(&node
->mtime
);
1566 return (dev_dioctl(dev
, ap
->a_command
, ap
->a_data
, ap
->a_fflag
,
1567 ap
->a_cred
, ap
->a_sysmsg
));
1571 * spec_poll(struct vnode *a_vp, int a_events, struct ucred *a_cred)
1575 devfs_spec_poll(struct vop_poll_args
*ap
)
1577 struct vnode
*vp
= ap
->a_vp
;
1578 struct devfs_node
*node
;
1581 if ((dev
= vp
->v_rdev
) == NULL
)
1582 return (EBADF
); /* device was revoked */
1583 node
= DEVFS_NODE(vp
);
1587 nanotime(&node
->atime
);
1590 return (dev_dpoll(dev
, ap
->a_events
));
1594 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn)
1598 devfs_spec_kqfilter(struct vop_kqfilter_args
*ap
)
1600 struct vnode
*vp
= ap
->a_vp
;
1601 struct devfs_node
*node
;
1604 if ((dev
= vp
->v_rdev
) == NULL
)
1605 return (EBADF
); /* device was revoked */
1606 node
= DEVFS_NODE(vp
);
1610 nanotime(&node
->atime
);
1613 return (dev_dkqfilter(dev
, ap
->a_kn
));
1617 * Convert a vnode strategy call into a device strategy call. Vnode strategy
1618 * calls are not limited to device DMA limits so we have to deal with the
1621 * spec_strategy(struct vnode *a_vp, struct bio *a_bio)
1624 devfs_spec_strategy(struct vop_strategy_args
*ap
)
1626 struct bio
*bio
= ap
->a_bio
;
1627 struct buf
*bp
= bio
->bio_buf
;
1634 if (bp
->b_cmd
!= BUF_CMD_READ
&& LIST_FIRST(&bp
->b_dep
) != NULL
)
1638 * Collect statistics on synchronous and asynchronous read
1639 * and write counts for disks that have associated filesystems.
1642 KKASSERT(vp
->v_rdev
!= NULL
); /* XXX */
1643 if (vn_isdisk(vp
, NULL
) && (mp
= vp
->v_rdev
->si_mountpoint
) != NULL
) {
1644 if (bp
->b_cmd
== BUF_CMD_READ
) {
1645 if (bp
->b_flags
& BIO_SYNC
)
1646 mp
->mnt_stat
.f_syncreads
++;
1648 mp
->mnt_stat
.f_asyncreads
++;
1650 if (bp
->b_flags
& BIO_SYNC
)
1651 mp
->mnt_stat
.f_syncwrites
++;
1653 mp
->mnt_stat
.f_asyncwrites
++;
1658 * Device iosize limitations only apply to read and write. Shortcut
1659 * the I/O if it fits.
1661 if ((maxiosize
= vp
->v_rdev
->si_iosize_max
) == 0) {
1662 devfs_debug(DEVFS_DEBUG_DEBUG
,
1663 "%s: si_iosize_max not set!\n",
1664 dev_dname(vp
->v_rdev
));
1665 maxiosize
= MAXPHYS
;
1667 #if SPEC_CHAIN_DEBUG & 2
1670 if (bp
->b_bcount
<= maxiosize
||
1671 (bp
->b_cmd
!= BUF_CMD_READ
&& bp
->b_cmd
!= BUF_CMD_WRITE
)) {
1672 dev_dstrategy_chain(vp
->v_rdev
, bio
);
1677 * Clone the buffer and set up an I/O chain to chunk up the I/O.
1679 nbp
= kmalloc(sizeof(*bp
), M_DEVBUF
, M_INTWAIT
|M_ZERO
);
1683 BUF_LOCK(nbp
, LK_EXCLUSIVE
);
1686 nbp
->b_flags
= B_PAGING
| (bp
->b_flags
& B_BNOCLIP
);
1687 nbp
->b_data
= bp
->b_data
;
1688 nbp
->b_bio1
.bio_done
= devfs_spec_strategy_done
;
1689 nbp
->b_bio1
.bio_offset
= bio
->bio_offset
;
1690 nbp
->b_bio1
.bio_caller_info1
.ptr
= bio
;
1693 * Start the first transfer
1695 if (vn_isdisk(vp
, NULL
))
1696 chunksize
= vp
->v_rdev
->si_bsize_phys
;
1698 chunksize
= DEV_BSIZE
;
1699 chunksize
= maxiosize
/ chunksize
* chunksize
;
1700 #if SPEC_CHAIN_DEBUG & 1
1701 devfs_debug(DEVFS_DEBUG_DEBUG
,
1702 "spec_strategy chained I/O chunksize=%d\n",
1705 nbp
->b_cmd
= bp
->b_cmd
;
1706 nbp
->b_bcount
= chunksize
;
1707 nbp
->b_bufsize
= chunksize
; /* used to detect a short I/O */
1708 nbp
->b_bio1
.bio_caller_info2
.index
= chunksize
;
1710 #if SPEC_CHAIN_DEBUG & 1
1711 devfs_debug(DEVFS_DEBUG_DEBUG
,
1712 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1713 bp
, 0, bp
->b_bcount
, nbp
->b_bcount
);
1716 dev_dstrategy(vp
->v_rdev
, &nbp
->b_bio1
);
1718 if (DEVFS_NODE(vp
)) {
1719 nanotime(&DEVFS_NODE(vp
)->atime
);
1720 nanotime(&DEVFS_NODE(vp
)->mtime
);
1727 * Chunked up transfer completion routine - chain transfers until done
1731 devfs_spec_strategy_done(struct bio
*nbio
)
1733 struct buf
*nbp
= nbio
->bio_buf
;
1734 struct bio
*bio
= nbio
->bio_caller_info1
.ptr
; /* original bio */
1735 struct buf
*bp
= bio
->bio_buf
; /* original bp */
1736 int chunksize
= nbio
->bio_caller_info2
.index
; /* chunking */
1737 int boffset
= nbp
->b_data
- bp
->b_data
;
1739 if (nbp
->b_flags
& B_ERROR
) {
1741 * An error terminates the chain, propogate the error back
1742 * to the original bp
1744 bp
->b_flags
|= B_ERROR
;
1745 bp
->b_error
= nbp
->b_error
;
1746 bp
->b_resid
= bp
->b_bcount
- boffset
+
1747 (nbp
->b_bcount
- nbp
->b_resid
);
1748 #if SPEC_CHAIN_DEBUG & 1
1749 devfs_debug(DEVFS_DEBUG_DEBUG
,
1750 "spec_strategy: chain %p error %d bcount %d/%d\n",
1751 bp
, bp
->b_error
, bp
->b_bcount
,
1752 bp
->b_bcount
- bp
->b_resid
);
1754 kfree(nbp
, M_DEVBUF
);
1756 } else if (nbp
->b_resid
) {
1758 * A short read or write terminates the chain
1760 bp
->b_error
= nbp
->b_error
;
1761 bp
->b_resid
= bp
->b_bcount
- boffset
+
1762 (nbp
->b_bcount
- nbp
->b_resid
);
1763 #if SPEC_CHAIN_DEBUG & 1
1764 devfs_debug(DEVFS_DEBUG_DEBUG
,
1765 "spec_strategy: chain %p short read(1) "
1767 bp
, bp
->b_bcount
- bp
->b_resid
, bp
->b_bcount
);
1769 kfree(nbp
, M_DEVBUF
);
1771 } else if (nbp
->b_bcount
!= nbp
->b_bufsize
) {
1773 * A short read or write can also occur by truncating b_bcount
1775 #if SPEC_CHAIN_DEBUG & 1
1776 devfs_debug(DEVFS_DEBUG_DEBUG
,
1777 "spec_strategy: chain %p short read(2) "
1779 bp
, nbp
->b_bcount
+ boffset
, bp
->b_bcount
);
1782 bp
->b_bcount
= nbp
->b_bcount
+ boffset
;
1783 bp
->b_resid
= nbp
->b_resid
;
1784 kfree(nbp
, M_DEVBUF
);
1786 } else if (nbp
->b_bcount
+ boffset
== bp
->b_bcount
) {
1788 * No more data terminates the chain
1790 #if SPEC_CHAIN_DEBUG & 1
1791 devfs_debug(DEVFS_DEBUG_DEBUG
,
1792 "spec_strategy: chain %p finished bcount %d\n",
1797 kfree(nbp
, M_DEVBUF
);
1801 * Continue the chain
1803 boffset
+= nbp
->b_bcount
;
1804 nbp
->b_data
= bp
->b_data
+ boffset
;
1805 nbp
->b_bcount
= bp
->b_bcount
- boffset
;
1806 if (nbp
->b_bcount
> chunksize
)
1807 nbp
->b_bcount
= chunksize
;
1808 nbp
->b_bio1
.bio_done
= devfs_spec_strategy_done
;
1809 nbp
->b_bio1
.bio_offset
= bio
->bio_offset
+ boffset
;
1811 #if SPEC_CHAIN_DEBUG & 1
1812 devfs_debug(DEVFS_DEBUG_DEBUG
,
1813 "spec_strategy: chain %p offset %d/%d bcount %d\n",
1814 bp
, boffset
, bp
->b_bcount
, nbp
->b_bcount
);
1817 dev_dstrategy(nbp
->b_vp
->v_rdev
, &nbp
->b_bio1
);
1822 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
1825 devfs_spec_freeblks(struct vop_freeblks_args
*ap
)
1830 * XXX: This assumes that strategy does the deed right away.
1831 * XXX: this may not be TRTTD.
1833 KKASSERT(ap
->a_vp
->v_rdev
!= NULL
);
1834 if ((dev_dflags(ap
->a_vp
->v_rdev
) & D_CANFREE
) == 0)
1836 bp
= geteblk(ap
->a_length
);
1837 bp
->b_cmd
= BUF_CMD_FREEBLKS
;
1838 bp
->b_bio1
.bio_offset
= ap
->a_offset
;
1839 bp
->b_bcount
= ap
->a_length
;
1840 dev_dstrategy(ap
->a_vp
->v_rdev
, &bp
->b_bio1
);
1845 * Implement degenerate case where the block requested is the block
1846 * returned, and assume that the entire device is contiguous in regards
1847 * to the contiguous block range (runp and runb).
1849 * spec_bmap(struct vnode *a_vp, off_t a_loffset,
1850 * off_t *a_doffsetp, int *a_runp, int *a_runb)
1853 devfs_spec_bmap(struct vop_bmap_args
*ap
)
1855 if (ap
->a_doffsetp
!= NULL
)
1856 *ap
->a_doffsetp
= ap
->a_loffset
;
1857 if (ap
->a_runp
!= NULL
)
1858 *ap
->a_runp
= MAXBSIZE
;
1859 if (ap
->a_runb
!= NULL
) {
1860 if (ap
->a_loffset
< MAXBSIZE
)
1861 *ap
->a_runb
= (int)ap
->a_loffset
;
1863 *ap
->a_runb
= MAXBSIZE
;
1870 * Special device advisory byte-level locks.
1872 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op,
1873 * struct flock *a_fl, int a_flags)
1877 devfs_spec_advlock(struct vop_advlock_args
*ap
)
1879 return ((ap
->a_flags
& F_POSIX
) ? EINVAL
: EOPNOTSUPP
);
1883 devfs_spec_getpages_iodone(struct bio
*bio
)
1885 bio
->bio_buf
->b_cmd
= BUF_CMD_DONE
;
1886 wakeup(bio
->bio_buf
);
1890 * spec_getpages() - get pages associated with device vnode.
1892 * Note that spec_read and spec_write do not use the buffer cache, so we
1893 * must fully implement getpages here.
1896 devfs_spec_getpages(struct vop_getpages_args
*ap
)
1900 int i
, pcount
, size
;
1903 vm_ooffset_t offset
;
1904 int toff
, nextoff
, nread
;
1905 struct vnode
*vp
= ap
->a_vp
;
1910 pcount
= round_page(ap
->a_count
) / PAGE_SIZE
;
1913 * Calculate the offset of the transfer and do sanity check.
1915 offset
= IDX_TO_OFF(ap
->a_m
[0]->pindex
) + ap
->a_offset
;
1918 * Round up physical size for real devices. We cannot round using
1919 * v_mount's block size data because v_mount has nothing to do with
1920 * the device. i.e. it's usually '/dev'. We need the physical block
1921 * size for the device itself.
1923 * We can't use v_rdev->si_mountpoint because it only exists when the
1924 * block device is mounted. However, we can use v_rdev.
1926 if (vn_isdisk(vp
, NULL
))
1927 blksiz
= vp
->v_rdev
->si_bsize_phys
;
1931 size
= (ap
->a_count
+ blksiz
- 1) & ~(blksiz
- 1);
1934 kva
= (vm_offset_t
)bp
->b_data
;
1937 * Map the pages to be read into the kva.
1939 pmap_qenter(kva
, ap
->a_m
, pcount
);
1941 /* Build a minimal buffer header. */
1942 bp
->b_cmd
= BUF_CMD_READ
;
1943 bp
->b_bcount
= size
;
1945 bp
->b_runningbufspace
= size
;
1947 runningbufspace
+= bp
->b_runningbufspace
;
1951 bp
->b_bio1
.bio_offset
= offset
;
1952 bp
->b_bio1
.bio_done
= devfs_spec_getpages_iodone
;
1954 mycpu
->gd_cnt
.v_vnodein
++;
1955 mycpu
->gd_cnt
.v_vnodepgsin
+= pcount
;
1958 vn_strategy(ap
->a_vp
, &bp
->b_bio1
);
1962 /* We definitely need to be at splbio here. */
1963 while (bp
->b_cmd
!= BUF_CMD_DONE
)
1964 tsleep(bp
, 0, "spread", 0);
1968 if (bp
->b_flags
& B_ERROR
) {
1970 error
= bp
->b_error
;
1976 * If EOF is encountered we must zero-extend the result in order
1977 * to ensure that the page does not contain garabge. When no
1978 * error occurs, an early EOF is indicated if b_bcount got truncated.
1979 * b_resid is relative to b_bcount and should be 0, but some devices
1980 * might indicate an EOF with b_resid instead of truncating b_bcount.
1982 nread
= bp
->b_bcount
- bp
->b_resid
;
1983 if (nread
< ap
->a_count
)
1984 bzero((caddr_t
)kva
+ nread
, ap
->a_count
- nread
);
1985 pmap_qremove(kva
, pcount
);
1988 for (i
= 0, toff
= 0; i
< pcount
; i
++, toff
= nextoff
) {
1989 nextoff
= toff
+ PAGE_SIZE
;
1992 m
->flags
&= ~PG_ZERO
;
1995 * NOTE: vm_page_undirty/clear_dirty etc do not clear the
1996 * pmap modified bit. pmap modified bit should have
1997 * already been cleared.
1999 if (nextoff
<= nread
) {
2000 m
->valid
= VM_PAGE_BITS_ALL
;
2002 } else if (toff
< nread
) {
2004 * Since this is a VM request, we have to supply the
2005 * unaligned offset to allow vm_page_set_valid()
2006 * to zero sub-DEV_BSIZE'd portions of the page.
2008 vm_page_set_valid(m
, 0, nread
- toff
);
2009 vm_page_clear_dirty_end_nonincl(m
, 0, nread
- toff
);
2015 if (i
!= ap
->a_reqpage
) {
2017 * Just in case someone was asking for this page we
2018 * now tell them that it is ok to use.
2020 if (!error
|| (m
->valid
== VM_PAGE_BITS_ALL
)) {
2022 if (m
->flags
& PG_WANTED
) {
2023 vm_page_activate(m
);
2025 vm_page_deactivate(m
);
2034 } else if (m
->valid
) {
2037 * Since this is a VM request, we need to make the
2038 * entire page presentable by zeroing invalid sections.
2040 if (m
->valid
!= VM_PAGE_BITS_ALL
)
2041 vm_page_zero_invalid(m
, FALSE
);
2045 m
= ap
->a_m
[ap
->a_reqpage
];
2046 devfs_debug(DEVFS_DEBUG_WARNING
,
2047 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n",
2048 devtoname(vp
->v_rdev
), error
, bp
, bp
->b_vp
);
2049 devfs_debug(DEVFS_DEBUG_WARNING
,
2050 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n",
2051 size
, bp
->b_resid
, ap
->a_count
, m
->valid
);
2052 devfs_debug(DEVFS_DEBUG_WARNING
,
2053 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n",
2054 nread
, ap
->a_reqpage
, (u_long
)m
->pindex
, pcount
);
2056 * Free the buffer header back to the swap buffer pool.
2059 return VM_PAGER_ERROR
;
2062 * Free the buffer header back to the swap buffer pool.
2065 if (DEVFS_NODE(ap
->a_vp
))
2066 nanotime(&DEVFS_NODE(ap
->a_vp
)->mtime
);
2072 sequential_heuristic(struct uio
*uio
, struct file
*fp
)
2075 * Sequential heuristic - detect sequential operation
2077 if ((uio
->uio_offset
== 0 && fp
->f_seqcount
> 0) ||
2078 uio
->uio_offset
== fp
->f_nextoff
) {
2080 * XXX we assume that the filesystem block size is
2081 * the default. Not true, but still gives us a pretty
2082 * good indicator of how sequential the read operations
2085 int tmpseq
= fp
->f_seqcount
;
2087 tmpseq
+= (uio
->uio_resid
+ BKVASIZE
- 1) / BKVASIZE
;
2088 if (tmpseq
> IO_SEQMAX
)
2090 fp
->f_seqcount
= tmpseq
;
2091 return(fp
->f_seqcount
<< IO_SEQSHIFT
);
2095 * Not sequential, quick draw-down of seqcount
2097 if (fp
->f_seqcount
> 1)
2104 extern SYSCTL_NODE(_vfs
, OID_AUTO
, devfs
, CTLFLAG_RW
, 0, "devfs");
2106 SYSCTL_INT(_vfs_devfs
, OID_AUTO
, mpsafe_writes
, CTLFLAG_RD
, &mpsafe_writes
,
2107 0, "mpsafe writes");
2108 SYSCTL_INT(_vfs_devfs
, OID_AUTO
, mplock_writes
, CTLFLAG_RD
, &mplock_writes
,
2109 0, "non-mpsafe writes");
2110 SYSCTL_INT(_vfs_devfs
, OID_AUTO
, mpsafe_reads
, CTLFLAG_RD
, &mpsafe_reads
,
2112 SYSCTL_INT(_vfs_devfs
, OID_AUTO
, mplock_reads
, CTLFLAG_RD
, &mplock_reads
,
2113 0, "non-mpsafe reads");