Source to ufs/mfs_vfsops.c
/*
* Copyright (c) 1989, 1990 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_vfsops.c 7.19 (Berkeley) 4/16/91
*/
#include "param.h"
#include "time.h"
#include "kernel.h"
#include "proc.h"
#include "buf.h"
#include "mount.h"
#include "signalvar.h"
#include "vnode.h"
#include "quota.h"
#include "inode.h"
#include "ufsmount.h"
#include "mfsnode.h"
#include "fs.h"
extern struct vnodeops mfs_vnodeops;
/*
* mfs vfs operations.
*/
int mfs_mount();
int mfs_start();
int ufs_unmount();
int ufs_root();
int ufs_quotactl();
int mfs_statfs();
int ufs_sync();
int ufs_fhtovp();
int ufs_vptofh();
int mfs_init();
struct vfsops mfs_vfsops = {
mfs_mount,
mfs_start,
ufs_unmount,
ufs_root,
ufs_quotactl,
mfs_statfs,
ufs_sync,
ufs_fhtovp,
ufs_vptofh,
mfs_init,
};
/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
mfs_mount(mp, path, data, ndp, p)
register struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
struct vnode *devvp;
struct mfs_args args;
struct ufsmount *ump;
register struct fs *fs;
register struct mfsnode *mfsp;
static int mfs_minor;
u_int size;
int error;
if (mp->mnt_flag & MNT_UPDATE) {
ump = VFSTOUFS(mp);
fs = ump->um_fs;
if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
fs->fs_ronly = 0;
return (0);
}
if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
return (error);
error = getnewvnode(VT_MFS, (struct mount *)0, &mfs_vnodeops, &devvp);
if (error)
return (error);
devvp->v_type = VBLK;
if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
panic("mfs_mount: dup dev");
mfsp = VTOMFS(devvp);
mfsp->mfs_baseoff = args.base;
mfsp->mfs_size = args.size;
mfsp->mfs_vnode = devvp;
mfsp->mfs_pid = p->p_pid;
mfsp->mfs_buflist = (struct buf *)0;
if (error = mountfs(devvp, mp)) {
mfsp->mfs_buflist = (struct buf *)-1;
vrele(devvp);
return (error);
}
ump = VFSTOUFS(mp);
fs = ump->um_fs;
(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
MNAMELEN);
(void) copyinstr(args.name, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void) mfs_statfs(mp, &mp->mnt_stat);
return (0);
}
int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
/*
* Used to grab the process and keep it in the kernel to service
* memory filesystem I/O requests.
*
* Loop servicing I/O requests.
* Copy the requested data into or out of the memory filesystem
* address space.
*/
/* ARGSUSED */
mfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
register struct mfsnode *mfsp = VTOMFS(vp);
register struct buf *bp;
register caddr_t base;
int error = 0;
base = mfsp->mfs_baseoff;
while (mfsp->mfs_buflist != (struct buf *)(-1)) {
while (bp = mfsp->mfs_buflist) {
mfsp->mfs_buflist = bp->av_forw;
mfs_doio(bp, base);
wakeup((caddr_t)bp);
}
/*
* If a non-ignored signal is received, try to unmount.
* If that fails, clear the signal (it has been "processed"),
* otherwise we will loop here, as tsleep will always return
* EINTR/ERESTART.
*/
if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
if (dounmount(mp, MNT_NOFORCE, p) != 0)
CLRSIG(p, CURSIG(p));
}
return (error);
}
/*
* Get file system statistics.
*/
mfs_statfs(mp, sbp, p)
struct mount *mp;
struct statfs *sbp;
struct proc *p;
{
int error;
error = ufs_statfs(mp, sbp, p);
sbp->f_type = MOUNT_MFS;
return (error);
}