4.4BSD/usr/src/sys/ufs/mfs/mfs_vnops.c
/*
* 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 8.2 (Berkeley) 8/11/93
*/
#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/map.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.
*/
int (**mfs_vnodeop_p)();
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_select_desc, mfs_select }, /* select */
{ &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, mfs_lock }, /* lock */
{ &vop_unlock_desc, mfs_unlock }, /* 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_blkatoff_desc, mfs_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, mfs_valloc }, /* valloc */
{ &vop_vfree_desc, mfs_vfree }, /* vfree */
{ &vop_truncate_desc, mfs_truncate }, /* truncate */
{ &vop_update_desc, mfs_update }, /* update */
{ &vop_bwrite_desc, mfs_bwrite }, /* bwrite */
{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
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(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_ioctl 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_un.b_addr, bp->b_bcount);
else
bcopy(bp->b_un.b_addr, 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);
}
#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.
*/
void
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) || defined(mips) || defined(sparc) || defined(luna68k)
/*
* 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_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.
*/
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;
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 %d, base %d, size %d\n", mfsp->mfs_pid,
mfsp->mfs_baseoff, mfsp->mfs_size);
return (0);
}
/*
* Block device bad operation
*/
int
mfs_badop()
{
panic("mfs_badop called\n");
/* NOTREACHED */
}
/*
* Memory based filesystem initialization.
*/
mfs_init()
{
#if !defined(hp300) && !defined(i386) && !defined(mips) && !defined(sparc) && !defined(luna68k)
rminit(mfsmap, (long)MFS_MAPREG, (long)1, "mfs mapreg", MFS_MAPSIZE);
#endif
}