NetBSD-5.0.2/sys/ufs/mfs/mfs_vnops.c
/* $NetBSD: mfs_vnops.c,v 1.52 2008/06/02 00:24:28 christos 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.
*
* @(#)mfs_vnops.c 8.11 (Berkeley) 5/22/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mfs_vnops.c,v 1.52 2008/06/02 00:24:28 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/vnode.h>
#include <sys/kmem.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#include <machine/vmparam.h>
#include <ufs/mfs/mfsnode.h>
#include <ufs/mfs/mfs_extern.h>
/*
* mfs vnode operations.
*/
int (**mfs_vnodeop_p)(void *);
const struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, mfs_lookup }, /* lookup */
{ &vop_create_desc, mfs_create }, /* create */
{ &vop_mknod_desc, mfs_mknod }, /* mknod */
{ &vop_open_desc, mfs_open }, /* open */
{ &vop_close_desc, mfs_close }, /* close */
{ &vop_access_desc, mfs_access }, /* access */
{ &vop_getattr_desc, mfs_getattr }, /* getattr */
{ &vop_setattr_desc, mfs_setattr }, /* setattr */
{ &vop_read_desc, mfs_read }, /* read */
{ &vop_write_desc, mfs_write }, /* write */
{ &vop_ioctl_desc, mfs_ioctl }, /* ioctl */
{ &vop_poll_desc, mfs_poll }, /* poll */
{ &vop_revoke_desc, mfs_revoke }, /* revoke */
{ &vop_mmap_desc, mfs_mmap }, /* mmap */
{ &vop_fsync_desc, spec_fsync }, /* fsync */
{ &vop_seek_desc, mfs_seek }, /* seek */
{ &vop_remove_desc, mfs_remove }, /* remove */
{ &vop_link_desc, mfs_link }, /* link */
{ &vop_rename_desc, mfs_rename }, /* rename */
{ &vop_mkdir_desc, mfs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, mfs_rmdir }, /* rmdir */
{ &vop_symlink_desc, mfs_symlink }, /* symlink */
{ &vop_readdir_desc, mfs_readdir }, /* readdir */
{ &vop_readlink_desc, mfs_readlink }, /* readlink */
{ &vop_abortop_desc, mfs_abortop }, /* abortop */
{ &vop_inactive_desc, mfs_inactive }, /* inactive */
{ &vop_reclaim_desc, mfs_reclaim }, /* reclaim */
{ &vop_lock_desc, genfs_nolock }, /* lock */
{ &vop_unlock_desc, genfs_nounlock }, /* unlock */
{ &vop_bmap_desc, mfs_bmap }, /* bmap */
{ &vop_strategy_desc, mfs_strategy }, /* strategy */
{ &vop_print_desc, mfs_print }, /* print */
{ &vop_islocked_desc, mfs_islocked }, /* islocked */
{ &vop_pathconf_desc, mfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, mfs_advlock }, /* advlock */
{ &vop_bwrite_desc, mfs_bwrite }, /* bwrite */
{ &vop_putpages_desc, mfs_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc mfs_vnodeop_opv_desc =
{ &mfs_vnodeop_p, mfs_vnodeop_entries };
/*
* Vnode Operations.
*
* Open called to allow memory filesystem to initialize and
* validate before actual IO. Record our process identifier
* so we can tell when we are doing I/O to ourself.
*/
/* ARGSUSED */
int
mfs_open(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *ap = v;
if (ap->a_vp->v_type != VBLK) {
panic("mfs_ioctl not VBLK");
/* NOTREACHED */
}
return (0);
}
/*
* Pass I/O requests to the memory filesystem process.
*/
int
mfs_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;
struct mfsnode *mfsp;
if (vp->v_type != VBLK || vp->v_usecount == 0)
panic("mfs_strategy: bad dev");
mfsp = VTOMFS(vp);
/* check for mini-root access */
if (mfsp->mfs_proc == NULL) {
void *base;
base = (char *)mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
if (bp->b_flags & B_READ)
memcpy(bp->b_data, base, bp->b_bcount);
else
memcpy(base, bp->b_data, bp->b_bcount);
bp->b_resid = 0;
biodone(bp);
} else if (mfsp->mfs_proc == curproc) {
mfs_doio(bp, mfsp->mfs_baseoff);
} else if (doing_shutdown) {
/*
* bitbucket I/O during shutdown.
* Note that reads should *not* happen here, but..
*/
if (bp->b_flags & B_READ)
printf("warning: mfs read during shutdown\n");
bp->b_resid = 0;
biodone(bp);
} else {
mutex_enter(&mfs_lock);
BUFQ_PUT(mfsp->mfs_buflist, bp);
cv_broadcast(&mfsp->mfs_cv);
mutex_exit(&mfs_lock);
}
return (0);
}
/*
* Memory file system I/O.
*/
void
mfs_doio(struct buf *bp, void *base)
{
base = (char *)base + (bp->b_blkno << DEV_BSHIFT);
if (bp->b_flags & B_READ)
bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
else
bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
if (bp->b_error == 0)
bp->b_resid = 0;
biodone(bp);
}
/*
* This is a noop, simply returning what one has been given.
*/
int
mfs_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 = 0;
return (0);
}
/*
* Memory filesystem close routine
*/
/* ARGSUSED */
int
mfs_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct mfsnode *mfsp = VTOMFS(vp);
struct buf *bp;
int error;
/*
* Finish any pending I/O requests.
*/
mutex_enter(&mfs_lock);
while ((bp = BUFQ_GET(mfsp->mfs_buflist)) != NULL) {
mutex_exit(&mfs_lock);
mfs_doio(bp, mfsp->mfs_baseoff);
mutex_enter(&mfs_lock);
}
mutex_exit(&mfs_lock);
/*
* On last close of a memory filesystem
* we must invalidate any in core blocks, so that
* we can, free up its vnode.
*/
if ((error = vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 0, 0)) != 0)
return (error);
/*
* There should be no way to have any more uses of this
* vnode, so if we find any other uses, it is a panic.
*/
if (BUFQ_PEEK(mfsp->mfs_buflist) != NULL)
panic("mfs_close");
/*
* Send a request to the filesystem server to exit.
*/
mutex_enter(&mfs_lock);
mfsp->mfs_shutdown = 1;
cv_broadcast(&mfsp->mfs_cv);
mutex_exit(&mfs_lock);
return (0);
}
/*
* Memory filesystem inactive routine
*/
/* ARGSUSED */
int
mfs_inactive(void *v)
{
struct vop_inactive_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct mfsnode *mfsp = VTOMFS(vp);
if (BUFQ_PEEK(mfsp->mfs_buflist) != NULL)
panic("mfs_inactive: not inactive (mfs_buflist %p)",
BUFQ_PEEK(mfsp->mfs_buflist));
VOP_UNLOCK(vp, 0);
return (0);
}
/*
* Reclaim a memory filesystem devvp so that it can be reused.
*/
int
mfs_reclaim(void *v)
{
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct mfsnode *mfsp = VTOMFS(vp);
int refcnt;
mutex_enter(&mfs_lock);
vp->v_data = NULL;
refcnt = --mfsp->mfs_refcnt;
mutex_exit(&mfs_lock);
if (refcnt == 0) {
bufq_free(mfsp->mfs_buflist);
cv_destroy(&mfsp->mfs_cv);
kmem_free(mfsp, sizeof(*mfsp));
}
return (0);
}
/*
* Print out the contents of an mfsnode.
*/
int
mfs_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct mfsnode *mfsp = VTOMFS(ap->a_vp);
printf("tag VT_MFS, pid %d, base %p, size %ld\n",
(mfsp->mfs_proc != NULL) ? mfsp->mfs_proc->p_pid : 0,
mfsp->mfs_baseoff, mfsp->mfs_size);
return (0);
}