NetBSD/sys/miscfs/specfs/spec_vnops.c

815 lines
19 KiB
C

/* $NetBSD: spec_vnops.c,v 1.107 2007/10/08 18:04:05 ad Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)spec_vnops.c 8.15 (Berkeley) 7/14/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.107 2007/10/08 18:04:05 ad Exp $");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/lockf.h>
#include <sys/tty.h>
#include <sys/kauth.h>
#include <sys/fstrans.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
/* symbolic sleep message strings for devices */
const char devopn[] = "devopn";
const char devio[] = "devio";
const char devwait[] = "devwait";
const char devin[] = "devin";
const char devout[] = "devout";
const char devioc[] = "devioc";
const char devcls[] = "devcls";
struct vnode *speclisth[SPECHSZ];
/*
* This vnode operations vector is used for two things only:
* - special device nodes created from whole cloth by the kernel.
* - as a temporary vnodeops replacement for vnodes which were found to
* be aliased by callers of checkalias().
* For the ops vector for vnodes built from special devices found in a
* filesystem, see (e.g) ffs_specop_entries[] in ffs_vnops.c or the
* equivalent for other filesystems.
*/
int (**spec_vnodeop_p)(void *);
const struct vnodeopv_entry_desc spec_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, spec_lookup }, /* lookup */
{ &vop_create_desc, spec_create }, /* create */
{ &vop_mknod_desc, spec_mknod }, /* mknod */
{ &vop_open_desc, spec_open }, /* open */
{ &vop_close_desc, spec_close }, /* close */
{ &vop_access_desc, spec_access }, /* access */
{ &vop_getattr_desc, spec_getattr }, /* getattr */
{ &vop_setattr_desc, spec_setattr }, /* setattr */
{ &vop_read_desc, spec_read }, /* read */
{ &vop_write_desc, spec_write }, /* write */
{ &vop_lease_desc, spec_lease_check }, /* lease */
{ &vop_fcntl_desc, spec_fcntl }, /* fcntl */
{ &vop_ioctl_desc, spec_ioctl }, /* ioctl */
{ &vop_poll_desc, spec_poll }, /* poll */
{ &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, spec_revoke }, /* revoke */
{ &vop_mmap_desc, spec_mmap }, /* mmap */
{ &vop_fsync_desc, spec_fsync }, /* fsync */
{ &vop_seek_desc, spec_seek }, /* seek */
{ &vop_remove_desc, spec_remove }, /* remove */
{ &vop_link_desc, spec_link }, /* link */
{ &vop_rename_desc, spec_rename }, /* rename */
{ &vop_mkdir_desc, spec_mkdir }, /* mkdir */
{ &vop_rmdir_desc, spec_rmdir }, /* rmdir */
{ &vop_symlink_desc, spec_symlink }, /* symlink */
{ &vop_readdir_desc, spec_readdir }, /* readdir */
{ &vop_readlink_desc, spec_readlink }, /* readlink */
{ &vop_abortop_desc, spec_abortop }, /* abortop */
{ &vop_inactive_desc, spec_inactive }, /* inactive */
{ &vop_reclaim_desc, spec_reclaim }, /* reclaim */
{ &vop_lock_desc, spec_lock }, /* lock */
{ &vop_unlock_desc, spec_unlock }, /* unlock */
{ &vop_bmap_desc, spec_bmap }, /* bmap */
{ &vop_strategy_desc, spec_strategy }, /* strategy */
{ &vop_print_desc, spec_print }, /* print */
{ &vop_islocked_desc, spec_islocked }, /* islocked */
{ &vop_pathconf_desc, spec_pathconf }, /* pathconf */
{ &vop_advlock_desc, spec_advlock }, /* advlock */
{ &vop_bwrite_desc, spec_bwrite }, /* bwrite */
{ &vop_getpages_desc, spec_getpages }, /* getpages */
{ &vop_putpages_desc, spec_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc spec_vnodeop_opv_desc =
{ &spec_vnodeop_p, spec_vnodeop_entries };
/*
* Trivial lookup routine that always fails.
*/
int
spec_lookup(void *v)
{
struct vop_lookup_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap = v;
*ap->a_vpp = NULL;
return (ENOTDIR);
}
/*
* Returns true if dev is /dev/mem or /dev/kmem.
*/
int
iskmemdev(dev_t dev)
{
/* mem_no is emitted by config(8) to generated devsw.c */
extern const int mem_no;
/* minor 14 is /dev/io on i386 with COMPAT_10 */
return (major(dev) == mem_no && (minor(dev) < 2 || minor(dev) == 14));
}
/*
* Open a special file.
*/
/* ARGSUSED */
int
spec_open(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct lwp *l = ap->a_l;
struct vnode *vp = ap->a_vp;
dev_t dev = (dev_t)vp->v_rdev;
int error;
struct partinfo pi;
enum kauth_device_req req;
/*
* Don't allow open if fs is mounted -nodev.
*/
if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
return (ENXIO);
#define M2K(m) (((m) & FREAD) && ((m) & FWRITE) ? \
KAUTH_REQ_DEVICE_RAWIO_SPEC_RW : \
(m) & FWRITE ? KAUTH_REQ_DEVICE_RAWIO_SPEC_WRITE : \
KAUTH_REQ_DEVICE_RAWIO_SPEC_READ)
switch (vp->v_type) {
case VCHR:
req = M2K(ap->a_mode);
error = kauth_authorize_device_spec(ap->a_cred, req, vp);
if (error)
return (error);
if (cdev_type(dev) == D_TTY)
vp->v_flag |= VISTTY;
VOP_UNLOCK(vp, 0);
error = cdev_open(dev, ap->a_mode, S_IFCHR, l);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (cdev_type(dev) != D_DISK)
return error;
break;
case VBLK:
req = M2K(ap->a_mode);
error = kauth_authorize_device_spec(ap->a_cred, req, vp);
if (error)
return (error);
error = bdev_open(dev, ap->a_mode, S_IFBLK, l);
break;
case VNON:
case VLNK:
case VDIR:
case VREG:
case VBAD:
case VFIFO:
case VSOCK:
default:
return 0;
}
#undef M2K
if (error)
return error;
if (vp->v_type == VCHR)
error = cdev_ioctl(vp->v_rdev, DIOCGPART, &pi, FREAD, curlwp);
else
error = bdev_ioctl(vp->v_rdev, DIOCGPART, &pi, FREAD, curlwp);
if (error == 0)
uvm_vnp_setsize(vp,
(voff_t)pi.disklab->d_secsize * pi.part->p_size);
return 0;
}
/*
* Vnode op for read
*/
/* ARGSUSED */
int
spec_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct lwp *l = curlwp;
struct buf *bp;
daddr_t bn;
int bsize, bscale;
struct partinfo dpart;
int n, on;
int error = 0;
#ifdef DIAGNOSTIC
if (uio->uio_rw != UIO_READ)
panic("spec_read mode");
if (&uio->uio_vmspace->vm_map != kernel_map &&
uio->uio_vmspace != curproc->p_vmspace)
panic("spec_read proc");
#endif
if (uio->uio_resid == 0)
return (0);
switch (vp->v_type) {
case VCHR:
VOP_UNLOCK(vp, 0);
error = cdev_read(vp->v_rdev, uio, ap->a_ioflag);
vn_lock(vp, LK_SHARED | LK_RETRY);
return (error);
case VBLK:
if (uio->uio_offset < 0)
return (EINVAL);
bsize = BLKDEV_IOSIZE;
if (bdev_ioctl(vp->v_rdev, DIOCGPART, &dpart, FREAD, l) == 0) {
if (dpart.part->p_fstype == FS_BSDFFS &&
dpart.part->p_frag != 0 && dpart.part->p_fsize != 0)
bsize = dpart.part->p_frag *
dpart.part->p_fsize;
}
bscale = bsize >> DEV_BSHIFT;
do {
bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1);
on = uio->uio_offset % bsize;
n = min((unsigned)(bsize - on), uio->uio_resid);
error = bread(vp, bn, bsize, NOCRED, &bp);
n = min(n, bsize - bp->b_resid);
if (error) {
brelse(bp, 0);
return (error);
}
error = uiomove((char *)bp->b_data + on, n, uio);
brelse(bp, 0);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
default:
panic("spec_read type");
}
/* NOTREACHED */
}
/*
* Vnode op for write
*/
/* ARGSUSED */
int
spec_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct lwp *l = curlwp;
struct buf *bp;
daddr_t bn;
int bsize, bscale;
struct partinfo dpart;
int n, on;
int error = 0;
#ifdef DIAGNOSTIC
if (uio->uio_rw != UIO_WRITE)
panic("spec_write mode");
if (&uio->uio_vmspace->vm_map != kernel_map &&
uio->uio_vmspace != curproc->p_vmspace)
panic("spec_write proc");
#endif
switch (vp->v_type) {
case VCHR:
VOP_UNLOCK(vp, 0);
error = cdev_write(vp->v_rdev, uio, ap->a_ioflag);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
return (error);
case VBLK:
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
bsize = BLKDEV_IOSIZE;
if (bdev_ioctl(vp->v_rdev, DIOCGPART, &dpart, FREAD, l) == 0) {
if (dpart.part->p_fstype == FS_BSDFFS &&
dpart.part->p_frag != 0 && dpart.part->p_fsize != 0)
bsize = dpart.part->p_frag *
dpart.part->p_fsize;
}
bscale = bsize >> DEV_BSHIFT;
do {
bn = (uio->uio_offset >> DEV_BSHIFT) &~ (bscale - 1);
on = uio->uio_offset % bsize;
n = min((unsigned)(bsize - on), uio->uio_resid);
if (n == bsize)
bp = getblk(vp, bn, bsize, 0, 0);
else
error = bread(vp, bn, bsize, NOCRED, &bp);
if (error) {
brelse(bp, 0);
return (error);
}
n = min(n, bsize - bp->b_resid);
error = uiomove((char *)bp->b_data + on, n, uio);
if (error)
brelse(bp, 0);
else {
if (n + on == bsize)
bawrite(bp);
else
bdwrite(bp);
error = bp->b_error;
}
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
default:
panic("spec_write type");
}
/* NOTREACHED */
}
/*
* Device ioctl operation.
*/
/* ARGSUSED */
int
spec_ioctl(void *v)
{
struct vop_ioctl_args /* {
struct vnode *a_vp;
u_long a_command;
void *a_data;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
dev_t dev;
/*
* Extract all the info we need from the vnode, taking care to
* avoid a race with VOP_REVOKE().
*/
vp = ap->a_vp;
dev = NODEV;
simple_lock(&vp->v_interlock);
if ((vp->v_flag & VXLOCK) == 0 && vp->v_specinfo) {
dev = vp->v_rdev;
}
simple_unlock(&vp->v_interlock);
if (dev == NODEV) {
return ENXIO;
}
switch (vp->v_type) {
case VCHR:
return cdev_ioctl(dev, ap->a_command, ap->a_data,
ap->a_fflag, ap->a_l);
case VBLK:
return bdev_ioctl(dev, ap->a_command, ap->a_data,
ap->a_fflag, ap->a_l);
default:
panic("spec_ioctl");
/* NOTREACHED */
}
}
/* ARGSUSED */
int
spec_poll(void *v)
{
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
dev_t dev;
/*
* Extract all the info we need from the vnode, taking care to
* avoid a race with VOP_REVOKE().
*/
vp = ap->a_vp;
dev = NODEV;
simple_lock(&vp->v_interlock);
if ((vp->v_flag & VXLOCK) == 0 && vp->v_specinfo) {
dev = vp->v_rdev;
}
simple_unlock(&vp->v_interlock);
if (dev == NODEV) {
return POLLERR;
}
switch (vp->v_type) {
case VCHR:
return cdev_poll(dev, ap->a_events, ap->a_l);
default:
return (genfs_poll(v));
}
}
/* ARGSUSED */
int
spec_kqfilter(void *v)
{
struct vop_kqfilter_args /* {
struct vnode *a_vp;
struct proc *a_kn;
} */ *ap = v;
dev_t dev;
switch (ap->a_vp->v_type) {
case VCHR:
dev = ap->a_vp->v_rdev;
return cdev_kqfilter(dev, ap->a_kn);
default:
/*
* Block devices don't support kqfilter, and refuse it
* for any other files (like those vflush()ed) too.
*/
return (EOPNOTSUPP);
}
}
/*
* Allow mapping of only D_DISK. This is called only for VBLK.
*/
int
spec_mmap(void *v)
{
struct vop_mmap_args /* {
struct vnode *a_vp;
vm_prot_t a_prot;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
KASSERT(vp->v_type == VBLK);
if (bdev_type(vp->v_rdev) != D_DISK)
return EINVAL;
return 0;
}
/*
* Synch buffers associated with a block device
*/
/* ARGSUSED */
int
spec_fsync(void *v)
{
struct vop_fsync_args /* {
struct vnode *a_vp;
kauth_cred_t a_cred;
int a_flags;
off_t offlo;
off_t offhi;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
if (vp->v_type == VBLK)
vflushbuf(vp, (ap->a_flags & FSYNC_WAIT) != 0);
return (0);
}
/*
* Just call the device strategy routine
*/
int
spec_strategy(void *v)
{
struct vop_strategy_args /* {
struct vnode *a_vp;
struct buf *a_bp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct buf *bp = ap->a_bp;
int error;
error = 0;
bp->b_dev = vp->v_rdev;
if (!(bp->b_flags & B_READ) &&
(LIST_FIRST(&bp->b_dep)) != NULL && bioopsp)
bioopsp->io_start(bp);
if (!(bp->b_flags & B_READ))
error = fscow_run(bp);
if (error) {
bp->b_error = error;
biodone(bp);
return (error);
}
bdev_strategy(bp);
return (0);
}
int
spec_inactive(void *v)
{
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_l;
} */ *ap = v;
VOP_UNLOCK(ap->a_vp, 0);
return (0);
}
/*
* This is a noop, simply returning what one has been given.
*/
int
spec_bmap(void *v)
{
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap = v;
if (ap->a_vpp != NULL)
*ap->a_vpp = ap->a_vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn;
if (ap->a_runp != NULL)
*ap->a_runp = (MAXBSIZE >> DEV_BSHIFT) - 1;
return (0);
}
/*
* Device close routine
*/
/* ARGSUSED */
int
spec_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct session *sess;
dev_t dev = vp->v_rdev;
int mode, error, count, flags, flags1;
count = vcount(vp);
flags = vp->v_flag;
switch (vp->v_type) {
case VCHR:
/*
* Hack: a tty device that is a controlling terminal
* has a reference from the session structure.
* We cannot easily tell that a character device is
* a controlling terminal, unless it is the closing
* process' controlling terminal. In that case,
* if the reference count is 2 (this last descriptor
* plus the session), release the reference from the session.
* Also remove the link from the tty back to the session
* and pgrp - due to the way consoles are handled we cannot
* guarantee that the vrele() will do the final close on the
* actual tty device.
*/
mutex_enter(&proclist_lock);
if (count == 2 && ap->a_l &&
vp == (sess = ap->a_l->l_proc->p_session)->s_ttyvp) {
sess->s_ttyvp = NULL;
if (sess->s_ttyp->t_session != NULL) {
sess->s_ttyp->t_pgrp = NULL;
sess->s_ttyp->t_session = NULL;
mutex_exit(&proclist_lock);
SESSRELE(sess);
} else {
if (sess->s_ttyp->t_pgrp != NULL)
panic("spec_close: spurious pgrp ref");
mutex_exit(&proclist_lock);
}
vrele(vp);
count--;
} else
mutex_exit(&proclist_lock);
/*
* If the vnode is locked, then we are in the midst
* of forcably closing the device, otherwise we only
* close on last reference.
*/
if (count > 1 && (flags & VXLOCK) == 0)
return (0);
mode = S_IFCHR;
break;
case VBLK:
/*
* On last close of a block device (that isn't mounted)
* we must invalidate any in core blocks, so that
* we can, for instance, change floppy disks.
*/
error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_l, 0, 0);
if (error)
return (error);
/*
* We do not want to really close the device if it
* is still in use unless we are trying to close it
* forcibly. Since every use (buffer, vnode, swap, cmap)
* holds a reference to the vnode, and because we mark
* any other vnodes that alias this device, when the
* sum of the reference counts on all the aliased
* vnodes descends to one, we are on last close.
*/
if (count > 1 && (flags & VXLOCK) == 0)
return (0);
mode = S_IFBLK;
break;
default:
panic("spec_close: not special");
}
flags1 = ap->a_fflag;
/*
* if VXLOCK is set, then we're going away soon, so make this
* non-blocking. Also ensures that we won't wedge in vn_lock below.
*/
if (flags & VXLOCK)
flags1 |= FNONBLOCK;
/*
* If we're able to block, release the vnode lock & reacquire. We
* might end up sleeping for someone else who wants our queues. They
* won't get them if we hold the vnode locked. Also, if VXLOCK is
* set, don't release the lock as we won't be able to regain it.
*/
if (!(flags1 & FNONBLOCK))
VOP_UNLOCK(vp, 0);
if (vp->v_type == VBLK)
error = bdev_close(dev, flags1, mode, ap->a_l);
else
error = cdev_close(dev, flags1, mode, ap->a_l);
if (!(flags1 & FNONBLOCK))
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
return (error);
}
/*
* Print out the contents of a special device vnode.
*/
int
spec_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
printf("tag VT_NON, dev %d, %d\n", major(ap->a_vp->v_rdev),
minor(ap->a_vp->v_rdev));
return 0;
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
int
spec_pathconf(void *v)
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
case _PC_SYNC_IO:
*ap->a_retval = 1;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Advisory record locking support.
*/
int
spec_advlock(void *v)
{
struct vop_advlock_args /* {
struct vnode *a_vp;
void *a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
return lf_advlock(ap, &vp->v_speclockf, (off_t)0);
}