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Make buffered acces to bdevs from userland controllable with

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a sysctl vfs.bdev_access.
This commit is contained in:
phk 1999-08-31 21:01:57 +00:00
parent 0fec0b6e4d
commit 033afb6ce4
5 changed files with 39 additions and 19 deletions
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2
sys/conf/NOTES
View File

@ -627,7 +627,7 @@ options EXT2FS
#
# Only set this if you positively know why you should never do that.
options ALLOW_BDEV_ACCESS
options ALLOW_BDEV_ACCESS # enable bdev access
#####################################################################

26
sys/fs/specfs/spec_vnops.c
View File

@ -47,6 +47,7 @@
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/vmmeter.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_prot.h>
@ -234,6 +235,15 @@ spec_open(ap)
return (0);
}
#ifdef ALLOW_BDEV_ACCESS
static int bdev_access = 1;
#else
static int bdev_access;
#endif
SYSCTL_INT(_vfs, OID_AUTO, bdev_access, CTLFLAG_RW, &bdev_access, 0,
"allow block device access");
/*
* Vnode op for read
*/
@ -247,8 +257,8 @@ spec_read(ap)
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct uio *uio = ap->a_uio;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct proc *p = uio->uio_procp;
struct buf *bp;
daddr_t bn, nextbn;
@ -273,7 +283,7 @@ spec_read(ap)
switch (vp->v_type) {
case VBLK:
#ifdef ALLOW_BDEV_ACCESS
if (bdev_access) {
if (uio->uio_offset < 0)
return (EINVAL);
@ -307,7 +317,7 @@ spec_read(ap)
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
#endif /* ALLOW_BDEV_ACCESS */
}
case VCHR:
VOP_UNLOCK(vp, 0, p);
error = (*devsw(dev)->d_read) (dev, uio, ap->a_ioflag);
@ -333,8 +343,8 @@ spec_write(ap)
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct uio *uio = ap->a_uio;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct proc *p = uio->uio_procp;
struct buf *bp;
daddr_t bn;
@ -357,7 +367,7 @@ spec_write(ap)
switch (vp->v_type) {
case VBLK:
#ifdef ALLOW_BDEV_ACCESS
if (bdev_access) {
if (uio->uio_offset < 0)
return (EINVAL);
@ -393,7 +403,7 @@ spec_write(ap)
bdwrite(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
#endif /* ALLOW_BDEV_ACCESS */
}
case VCHR:
VOP_UNLOCK(vp, 0, p);

2
sys/i386/conf/LINT
View File

@ -627,7 +627,7 @@ options EXT2FS
#
# Only set this if you positively know why you should never do that.
options ALLOW_BDEV_ACCESS
options ALLOW_BDEV_ACCESS # enable bdev access
#####################################################################

2
sys/i386/conf/NOTES
View File

@ -627,7 +627,7 @@ options EXT2FS
#
# Only set this if you positively know why you should never do that.
options ALLOW_BDEV_ACCESS
options ALLOW_BDEV_ACCESS # enable bdev access
#####################################################################

26
sys/miscfs/specfs/spec_vnops.c
View File

@ -47,6 +47,7 @@
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/vmmeter.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_prot.h>
@ -234,6 +235,15 @@ spec_open(ap)
return (0);
}
#ifdef ALLOW_BDEV_ACCESS
static int bdev_access = 1;
#else
static int bdev_access;
#endif
SYSCTL_INT(_vfs, OID_AUTO, bdev_access, CTLFLAG_RW, &bdev_access, 0,
"allow block device access");
/*
* Vnode op for read
*/
@ -247,8 +257,8 @@ spec_read(ap)
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct uio *uio = ap->a_uio;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct proc *p = uio->uio_procp;
struct buf *bp;
daddr_t bn, nextbn;
@ -273,7 +283,7 @@ spec_read(ap)
switch (vp->v_type) {
case VBLK:
#ifdef ALLOW_BDEV_ACCESS
if (bdev_access) {
if (uio->uio_offset < 0)
return (EINVAL);
@ -307,7 +317,7 @@ spec_read(ap)
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
#endif /* ALLOW_BDEV_ACCESS */
}
case VCHR:
VOP_UNLOCK(vp, 0, p);
error = (*devsw(dev)->d_read) (dev, uio, ap->a_ioflag);
@ -333,8 +343,8 @@ spec_write(ap)
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct uio *uio = ap->a_uio;
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct proc *p = uio->uio_procp;
struct buf *bp;
daddr_t bn;
@ -357,7 +367,7 @@ spec_write(ap)
switch (vp->v_type) {
case VBLK:
#ifdef ALLOW_BDEV_ACCESS
if (bdev_access) {
if (uio->uio_offset < 0)
return (EINVAL);
@ -393,7 +403,7 @@ spec_write(ap)
bdwrite(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
#endif /* ALLOW_BDEV_ACCESS */
}
case VCHR:
VOP_UNLOCK(vp, 0, p);