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freebsd-dev/sys/ufs/mfs/mfs_vnops.c
Bruce Evans f57e65478d Introduced a type `vop_t' for vnode operation functions and used 
it 1138 times (:-() in casts and a few more times in declarations.
This change is null for the i386.

The type has to be `typedef int vop_t(void *)' and not `typedef
int vop_t()' because `gcc -Wstrict-prototypes' warns about the
latter.  Since vnode op functions are called with args of different
(struct pointer) types, neither of these function types is any use
for type checking of the arg, so it would be preferable not to use
the complete function type, especially since using the complete
type requires adding 1138 casts to avoid compiler warnings and
another 40+ casts to reverse the function pointer conversions before
calling the functions.
1995-11-09 08:17:23 +00:00

355 lines
9.4 KiB
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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 8.3 (Berkeley) 9/21/93
* $Id: mfs_vnops.c,v 1.11 1995/10/31 10:45:48 peter 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/vnode.h>
#include <sys/malloc.h>
#include <miscfs/specfs/specdev.h>
#include <machine/vmparam.h>
#include <ufs/mfs/mfsnode.h>
#include <ufs/mfs/mfsiom.h>
#include <ufs/mfs/mfs_extern.h>
#if !defined(hp300) && !defined(i386) && !defined(mips) && !defined(sparc) && !defined(luna68k)
static int mfsmap_want; /* 1 => need kernel I/O resources */
struct map mfsmap[MFS_MAPSIZE];
extern char mfsiobuf[];
#endif
/*
* mfs vnode operations.
*/
vop_t **mfs_vnodeop_p;
struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *)vn_default_error },
{ &vop_lookup_desc, (vop_t *)mfs_lookup }, /* lookup */
{ &vop_create_desc, (vop_t *)mfs_create }, /* create */
{ &vop_mknod_desc, (vop_t *)mfs_mknod }, /* mknod */
{ &vop_open_desc, (vop_t *)mfs_open }, /* open */
{ &vop_close_desc, (vop_t *)mfs_close }, /* close */
{ &vop_access_desc, (vop_t *)mfs_access }, /* access */
{ &vop_getattr_desc, (vop_t *)mfs_getattr }, /* getattr */
{ &vop_setattr_desc, (vop_t *)mfs_setattr }, /* setattr */
{ &vop_read_desc, (vop_t *)mfs_read }, /* read */
{ &vop_write_desc, (vop_t *)mfs_write }, /* write */
{ &vop_ioctl_desc, (vop_t *)mfs_ioctl }, /* ioctl */
{ &vop_select_desc, (vop_t *)mfs_select }, /* select */
{ &vop_mmap_desc, (vop_t *)mfs_mmap }, /* mmap */
{ &vop_fsync_desc, (vop_t *)spec_fsync }, /* fsync */
{ &vop_seek_desc, (vop_t *)mfs_seek }, /* seek */
{ &vop_remove_desc, (vop_t *)mfs_remove }, /* remove */
{ &vop_link_desc, (vop_t *)mfs_link }, /* link */
{ &vop_rename_desc, (vop_t *)mfs_rename }, /* rename */
{ &vop_mkdir_desc, (vop_t *)mfs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, (vop_t *)mfs_rmdir }, /* rmdir */
{ &vop_symlink_desc, (vop_t *)mfs_symlink }, /* symlink */
{ &vop_readdir_desc, (vop_t *)mfs_readdir }, /* readdir */
{ &vop_readlink_desc, (vop_t *)mfs_readlink }, /* readlink */
{ &vop_abortop_desc, (vop_t *)mfs_abortop }, /* abortop */
{ &vop_inactive_desc, (vop_t *)mfs_inactive }, /* inactive */
{ &vop_reclaim_desc, (vop_t *)mfs_reclaim }, /* reclaim */
{ &vop_lock_desc, (vop_t *)mfs_lock }, /* lock */
{ &vop_unlock_desc, (vop_t *)mfs_unlock }, /* unlock */
{ &vop_bmap_desc, (vop_t *)mfs_bmap }, /* bmap */
{ &vop_strategy_desc, (vop_t *)mfs_strategy }, /* strategy */
{ &vop_print_desc, (vop_t *)mfs_print }, /* print */
{ &vop_islocked_desc, (vop_t *)mfs_islocked }, /* islocked */
{ &vop_pathconf_desc, (vop_t *)mfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, (vop_t *)mfs_advlock }, /* advlock */
{ &vop_blkatoff_desc, (vop_t *)mfs_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, (vop_t *)mfs_valloc }, /* valloc */
{ &vop_vfree_desc, (vop_t *)mfs_vfree }, /* vfree */
{ &vop_truncate_desc, (vop_t *)mfs_truncate }, /* truncate */
{ &vop_update_desc, (vop_t *)mfs_update }, /* update */
{ &vop_bwrite_desc, (vop_t *)mfs_bwrite }, /* bwrite */
{ NULL, NULL }
};
struct vnodeopv_desc mfs_vnodeop_opv_desc =
{ &mfs_vnodeop_p, mfs_vnodeop_entries };
VNODEOP_SET(mfs_vnodeop_opv_desc);
/*
* 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(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
if (ap->a_vp->v_type != VBLK) {
panic("mfs_open not VBLK");
/* NOTREACHED */
}
return (0);
}
/*
* Ioctl operation.
*/
/* ARGSUSED */
int
mfs_ioctl(ap)
struct vop_ioctl_args /* {
struct vnode *a_vp;
int a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (ENOTTY);
}
/*
* Pass I/O requests to the memory filesystem process.
*/
int
mfs_strategy(ap)
struct vop_strategy_args /* {
struct buf *a_bp;
} */ *ap;
{
register struct buf *bp = ap->a_bp;
register struct mfsnode *mfsp;
struct vnode *vp;
struct proc *p = curproc; /* XXX */
if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
panic("mfs_strategy: bad dev");
mfsp = VTOMFS(vp);
/* check for mini-root access */
if (mfsp->mfs_pid == 0) {
caddr_t base;
base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
if (bp->b_flags & B_READ)
bcopy(base, bp->b_data, bp->b_bcount);
else
bcopy(bp->b_data, base, bp->b_bcount);
biodone(bp);
} else if (mfsp->mfs_pid == p->p_pid) {
mfs_doio(bp, mfsp->mfs_baseoff);
} else {
bp->b_actf = mfsp->mfs_buflist;
mfsp->mfs_buflist = bp;
wakeup((caddr_t)vp);
}
return (0);
}
/*
* Memory file system I/O.
*
* Trivial on the HP since buffer has already been mapping into KVA space.
*/
void
mfs_doio(bp, base)
register struct buf *bp;
caddr_t base;
{
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)
bp->b_flags |= B_ERROR;
biodone(bp);
}
/*
* This is a noop, simply returning what one has been given.
*/
int
mfs_bmap(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap;
{
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(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct mfsnode *mfsp = VTOMFS(vp);
register struct buf *bp;
int error;
/*
* Finish any pending I/O requests.
*/
while (bp = mfsp->mfs_buflist) {
mfsp->mfs_buflist = bp->b_actf;
mfs_doio(bp, mfsp->mfs_baseoff);
wakeup((caddr_t)bp);
}
/*
* 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, 1, ap->a_cred, ap->a_p, 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 (vp->v_usecount > 1)
printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
if (vp->v_usecount > 1 || mfsp->mfs_buflist)
panic("mfs_close");
/*
* Send a request to the filesystem server to exit.
*/
mfsp->mfs_buflist = (struct buf *)(-1);
wakeup((caddr_t)vp);
return (0);
}
/*
* Memory filesystem inactive routine
*/
/* ARGSUSED */
int
mfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
if (mfsp->mfs_buflist && mfsp->mfs_buflist != (struct buf *)(-1))
panic("mfs_inactive: not inactive (mfs_buflist %x)",
mfsp->mfs_buflist);
return (0);
}
/*
* Reclaim a memory filesystem devvp so that it can be reused.
*/
int
mfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
FREE(ap->a_vp->v_data, M_MFSNODE);
ap->a_vp->v_data = NULL;
return (0);
}
/*
* Print out the contents of an mfsnode.
*/
int
mfs_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
printf("tag VT_MFS, pid %ld, base %p, size %ld\n", mfsp->mfs_pid,
mfsp->mfs_baseoff, mfsp->mfs_size);
return (0);
}
/*
* Block device bad operation
*/
int
mfs_badop()
{
panic("mfs_badop called");
/* NOTREACHED */
}
/*
* Memory based filesystem initialization.
*/
int
mfs_init()
{
return (0);
}
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