Net2/usr/src/sys/ufs/mfs_vnops.c
/*
* Copyright (c) 1989 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 7.22 (Berkeley) 4/16/91
*/
#include "param.h"
#include "systm.h"
#include "time.h"
#include "kernel.h"
#include "proc.h"
#include "buf.h"
#include "map.h"
#include "vnode.h"
#include "mfsnode.h"
#include "mfsiom.h"
#include "machine/vmparam.h"
#include "machine/mtpr.h"
#if !defined(hp300) && !defined(i386)
static int mfsmap_want; /* 1 => need kernel I/O resources */
struct map mfsmap[MFS_MAPSIZE];
extern char mfsiobuf[];
#endif
/*
* mfs vnode operations.
*/
struct vnodeops mfs_vnodeops = {
mfs_lookup, /* lookup */
mfs_create, /* create */
mfs_mknod, /* mknod */
mfs_open, /* open */
mfs_close, /* close */
mfs_access, /* access */
mfs_getattr, /* getattr */
mfs_setattr, /* setattr */
mfs_read, /* read */
mfs_write, /* write */
mfs_ioctl, /* ioctl */
mfs_select, /* select */
mfs_mmap, /* mmap */
mfs_fsync, /* fsync */
mfs_seek, /* seek */
mfs_remove, /* remove */
mfs_link, /* link */
mfs_rename, /* rename */
mfs_mkdir, /* mkdir */
mfs_rmdir, /* rmdir */
mfs_symlink, /* symlink */
mfs_readdir, /* readdir */
mfs_readlink, /* readlink */
mfs_abortop, /* abortop */
mfs_inactive, /* inactive */
mfs_reclaim, /* reclaim */
mfs_lock, /* lock */
mfs_unlock, /* unlock */
mfs_bmap, /* bmap */
mfs_strategy, /* strategy */
mfs_print, /* print */
mfs_islocked, /* islocked */
mfs_advlock, /* advlock */
};
/*
* 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 */
mfs_open(vp, mode, cred, p)
register struct vnode *vp;
int mode;
struct ucred *cred;
struct proc *p;
{
if (vp->v_type != VBLK) {
panic("mfs_ioctl not VBLK");
/* NOTREACHED */
}
return (0);
}
/*
* Ioctl operation.
*/
/* ARGSUSED */
mfs_ioctl(vp, com, data, fflag, cred, p)
struct vnode *vp;
int com;
caddr_t data;
int fflag;
struct ucred *cred;
struct proc *p;
{
return (-1);
}
/*
* Pass I/O requests to the memory filesystem process.
*/
mfs_strategy(bp)
register struct buf *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);
if (mfsp->mfs_pid == p->p_pid) {
mfs_doio(bp, mfsp->mfs_baseoff);
} else {
bp->av_forw = mfsp->mfs_buflist;
mfsp->mfs_buflist = bp;
wakeup((caddr_t)vp);
}
return (0);
}
#if defined(vax) || defined(tahoe)
/*
* Memory file system I/O.
*
* Essentially play ubasetup() and disk interrupt service routine by
* doing the copies to or from the memfs process. If doing physio
* (i.e. pagein), we must map the I/O through the kernel virtual
* address space.
*/
mfs_doio(bp, base)
register struct buf *bp;
caddr_t base;
{
register struct pte *pte, *ppte;
register caddr_t vaddr;
int off, npf, npf2, reg;
caddr_t kernaddr, offset;
/*
* For phys I/O, map the b_addr into kernel virtual space using
* the Mfsiomap pte's.
*/
if ((bp->b_flags & B_PHYS) == 0) {
kernaddr = bp->b_un.b_addr;
} else {
if (bp->b_flags & (B_PAGET | B_UAREA | B_DIRTY))
panic("swap on memfs?");
off = (int)bp->b_un.b_addr & PGOFSET;
npf = btoc(bp->b_bcount + off);
/*
* Get some mapping page table entries
*/
while ((reg = rmalloc(mfsmap, (long)npf)) == 0) {
mfsmap_want++;
sleep((caddr_t)&mfsmap_want, PZERO-1);
}
reg--;
pte = vtopte(bp->b_proc, btop(bp->b_un.b_addr));
/*
* Do vmaccess() but with the Mfsiomap page table.
*/
ppte = &Mfsiomap[reg];
vaddr = &mfsiobuf[reg * NBPG];
kernaddr = vaddr + off;
for (npf2 = npf; npf2; npf2--) {
mapin(ppte, (u_int)vaddr, pte->pg_pfnum,
(int)(PG_V|PG_KW));
#if defined(tahoe)
if ((bp->b_flags & B_READ) == 0)
mtpr(P1DC, vaddr);
#endif
ppte++;
pte++;
vaddr += NBPG;
}
}
offset = base + (bp->b_blkno << DEV_BSHIFT);
if (bp->b_flags & B_READ)
bp->b_error = copyin(offset, kernaddr, bp->b_bcount);
else
bp->b_error = copyout(kernaddr, offset, bp->b_bcount);
if (bp->b_error)
bp->b_flags |= B_ERROR;
/*
* Release pte's used by physical I/O.
*/
if (bp->b_flags & B_PHYS) {
rmfree(mfsmap, (long)npf, (long)++reg);
if (mfsmap_want) {
mfsmap_want = 0;
wakeup((caddr_t)&mfsmap_want);
}
}
biodone(bp);
}
#endif /* vax || tahoe */
#if defined(hp300) || defined(i386)
/*
* Memory file system I/O.
*
* Trivial on the HP since buffer has already been mapping into KVA space.
*/
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_un.b_addr, bp->b_bcount);
else
bp->b_error = copyout(bp->b_un.b_addr, base, bp->b_bcount);
if (bp->b_error)
bp->b_flags |= B_ERROR;
biodone(bp);
}
#endif
/*
* This is a noop, simply returning what one has been given.
*/
mfs_bmap(vp, bn, vpp, bnp)
struct vnode *vp;
daddr_t bn;
struct vnode **vpp;
daddr_t *bnp;
{
if (vpp != NULL)
*vpp = vp;
if (bnp != NULL)
*bnp = bn;
return (0);
}
/*
* Memory filesystem close routine
*/
/* ARGSUSED */
mfs_close(vp, flag, cred, p)
register struct vnode *vp;
int flag;
struct ucred *cred;
struct proc *p;
{
register struct mfsnode *mfsp = VTOMFS(vp);
register struct buf *bp;
/*
* Finish any pending I/O requests.
*/
while (bp = mfsp->mfs_buflist) {
mfsp->mfs_buflist = bp->av_forw;
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.
*/
vflushbuf(vp, 0);
if (vinvalbuf(vp, 1))
return (0);
/*
* 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 */
mfs_inactive(vp, p)
struct vnode *vp;
struct proc *p;
{
if (VTOMFS(vp)->mfs_buflist != (struct buf *)(-1))
panic("mfs_inactive: not inactive");
return (0);
}
/*
* Print out the contents of an mfsnode.
*/
mfs_print(vp)
struct vnode *vp;
{
register struct mfsnode *mfsp = VTOMFS(vp);
printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
mfsp->mfs_baseoff, mfsp->mfs_size);
}
/*
* Block device bad operation
*/
mfs_badop()
{
panic("mfs_badop called\n");
/* NOTREACHED */
}
/*
* Memory based filesystem initialization.
*/
mfs_init()
{
#if !defined(hp300) && !defined(i386)
rminit(mfsmap, (long)MFS_MAPREG, (long)1, "mfs mapreg", MFS_MAPSIZE);
#endif
}