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/* $OpenBSD: mfs_vnops.c,v 1.59 2021/12/12 09:17:17 visa Exp $ */
/* $NetBSD: mfs_vnops.c,v 1.8 1996/03/17 02:16:32 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 8.5 (Berkeley) 7/28/94
*/
#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 <sys/mount.h>
#include <sys/specdev.h>
#include <ufs/mfs/mfsnode.h>
#include <ufs/mfs/mfs_extern.h>
/* mfs vnode operations. */
const struct vops mfs_vops = {
.vop_lookup = vop_generic_badop,
.vop_create = vop_generic_badop,
.vop_mknod = vop_generic_badop,
.vop_open = mfs_open,
.vop_close = mfs_close,
.vop_access = vop_generic_badop,
.vop_getattr = vop_generic_badop,
.vop_setattr = vop_generic_badop,
.vop_read = vop_generic_badop,
.vop_write = vop_generic_badop,
.vop_ioctl = mfs_ioctl,
.vop_poll = vop_generic_badop,
.vop_kqfilter = vop_generic_badop,
.vop_revoke = vop_generic_revoke,
.vop_fsync = spec_fsync,
.vop_remove = vop_generic_badop,
.vop_link = vop_generic_badop,
.vop_rename = vop_generic_badop,
.vop_mkdir = vop_generic_badop,
.vop_rmdir = vop_generic_badop,
.vop_symlink = vop_generic_badop,
.vop_readdir = vop_generic_badop,
.vop_readlink = vop_generic_badop,
.vop_abortop = vop_generic_badop,
.vop_inactive = mfs_inactive,
.vop_reclaim = mfs_reclaim,
.vop_lock = nullop,
.vop_unlock = nullop,
.vop_islocked = nullop,
.vop_bmap = vop_generic_bmap,
.vop_strategy = mfs_strategy,
.vop_print = mfs_print,
.vop_pathconf = vop_generic_badop,
.vop_advlock = vop_generic_badop,
.vop_bwrite = vop_generic_bwrite
};
/*
* 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.
*/
int
mfs_open(void *v)
{
#ifdef DIAGNOSTIC
struct vop_open_args *ap = v;
if (ap->a_vp->v_type != VBLK) {
panic("mfs_open not VBLK");
}
#endif
return (0);
}
/*
* Ioctl operation.
*/
int
mfs_ioctl(void *v)
{
return (ENOTTY);
}
/*
* Pass I/O requests to the memory filesystem process.
*/
int
mfs_strategy(void *v)
{
struct vop_strategy_args *ap = v;
struct buf *bp = ap->a_bp;
struct mfsnode *mfsp;
struct vnode *vp = ap->a_vp;
if (vp->v_type != VBLK || vp->v_usecount == 0)
panic("mfs_strategy: bad dev");
mfsp = VTOMFS(vp);
if (mfsp->mfs_tid == curproc->p_tid) {
mfs_doio(mfsp, bp);
} else {
bufq_queue(&mfsp->mfs_bufq, bp);
wakeup(vp);
}
return (0);
}
/*
* Memory file system I/O.
*/
void
mfs_doio(struct mfsnode *mfsp, struct buf *bp)
{
caddr_t base;
long offset = bp->b_blkno << DEV_BSHIFT;
int s;
if (bp->b_bcount > mfsp->mfs_size - offset)
bp->b_bcount = mfsp->mfs_size - offset;
base = mfsp->mfs_baseoff + offset;
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;
else
bp->b_resid = 0;
s = splbio();
biodone(bp);
splx(s);
}
/*
* Memory filesystem close routine
*/
int
mfs_close(void *v)
{
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct mfsnode *mfsp = VTOMFS(vp);
struct buf *bp;
int error;
/*
* Finish any pending I/O requests.
*/
while (1) {
bp = bufq_dequeue(&mfsp->mfs_bufq);
if (bp == NULL)
break;
mfs_doio(mfsp, bp);
wakeup(bp);
}
/*
* On last close of a memory filesystem we must invalidate any in
* core blocks, so that we can free up its vnode.
*/
error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, INFSLP);
if (error != 0)
return (error);
#ifdef DIAGNOSTIC
/*
* There should be no way to have any more buffers on this vnode.
*/
if (bufq_peek(&mfsp->mfs_bufq))
printf("mfs_close: dirty buffers\n");
#endif
/*
* Send a request to the filesystem server to exit.
*/
mfsp->mfs_shutdown = 1;
wakeup(vp);
return (0);
}
/*
* Memory filesystem inactive routine
*/
int
mfs_inactive(void *v)
{
struct vop_inactive_args *ap = v;
#ifdef DIAGNOSTIC
struct mfsnode *mfsp = VTOMFS(ap->a_vp);
if (mfsp->mfs_shutdown && bufq_peek(&mfsp->mfs_bufq))
panic("mfs_inactive: not inactive");
#endif
VOP_UNLOCK(ap->a_vp);
return (0);
}
/*
* Reclaim a memory filesystem devvp so that it can be reused.
*/
int
mfs_reclaim(void *v)
{
struct vop_reclaim_args *ap = v;
struct vnode *vp = ap->a_vp;
free(vp->v_data, M_MFSNODE, sizeof(struct mfsnode));
vp->v_data = NULL;
return (0);
}
/*
* Print out the contents of an mfsnode.
*/
int
mfs_print(void *v)
{
struct vop_print_args *ap = v;
struct mfsnode *mfsp = VTOMFS(ap->a_vp);
printf("tag VT_MFS, tid %d, base %p, size %ld\n", mfsp->mfs_tid,
mfsp->mfs_baseoff, mfsp->mfs_size);
return (0);
}
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