4.4BSD/usr/src/sys/ufs/mfs/mfs_vfsops.c
/*
* Copyright (c) 1989, 1990, 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_vfsops.c 8.1 (Berkeley) 6/11/93
*/
#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/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/mfs/mfsnode.h>
#include <ufs/mfs/mfs_extern.h>
caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
u_long mfs_rootsize; /* size of mini-root in bytes */
static int mfs_minor; /* used for building internal dev_t */
extern int (**mfs_vnodeop_p)();
/*
* mfs vfs operations.
*/
struct vfsops mfs_vfsops = {
mfs_mount,
mfs_start,
ffs_unmount,
ffs_root,
ufs_quotactl,
mfs_statfs,
ffs_sync,
ffs_vget,
ffs_fhtovp,
ffs_vptofh,
mfs_init,
};
/*
* Called by main() when mfs is going to be mounted as root.
*
* Name is updated by mount(8) after booting.
*/
#define ROOTNAME "mfs_root"
mfs_mountroot()
{
extern struct vnode *rootvp;
register struct fs *fs;
register struct mount *mp;
struct proc *p = curproc; /* XXX */
struct ufsmount *ump;
struct mfsnode *mfsp;
u_int size;
int error;
/*
* Get vnodes for swapdev and rootdev.
*/
if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
panic("mfs_mountroot: can't setup bdevvp's");
mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
mp->mnt_op = &mfs_vfsops;
mp->mnt_flag = MNT_RDONLY;
mp->mnt_mounth = NULLVP;
mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
rootvp->v_data = mfsp;
rootvp->v_op = mfs_vnodeop_p;
rootvp->v_tag = VT_MFS;
mfsp->mfs_baseoff = mfs_rootbase;
mfsp->mfs_size = mfs_rootsize;
mfsp->mfs_vnode = rootvp;
mfsp->mfs_pid = p->p_pid;
mfsp->mfs_buflist = (struct buf *)0;
if (error = ffs_mountfs(rootvp, mp, p)) {
free(mp, M_MOUNT);
free(mfsp, M_MFSNODE);
return (error);
}
if (error = vfs_lock(mp)) {
(void)ffs_unmount(mp, 0, p);
free(mp, M_MOUNT);
free(mfsp, M_MFSNODE);
return (error);
}
rootfs = mp;
mp->mnt_next = mp;
mp->mnt_prev = mp;
mp->mnt_vnodecovered = NULLVP;
ump = VFSTOUFS(mp);
fs = ump->um_fs;
bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
fs->fs_fsmnt[0] = '/';
bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
MNAMELEN);
(void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
(void)ffs_statfs(mp, &mp->mnt_stat, p);
vfs_unlock(mp);
inittodr((time_t)0);
return (0);
}
/*
* This is called early in boot to set the base address and size
* of the mini-root.
*/
mfs_initminiroot(base)
caddr_t base;
{
struct fs *fs = (struct fs *)(base + SBOFF);
extern int (*mountroot)();
/* check for valid super block */
if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
fs->fs_bsize < sizeof(struct fs))
return (0);
mountroot = mfs_mountroot;
mfs_rootbase = base;
mfs_rootsize = fs->fs_fsize * fs->fs_size;
rootdev = makedev(255, mfs_minor++);
return (mfs_rootsize);
}
/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
int
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;
u_int size;
int flags, error;
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
ump = VFSTOUFS(mp);
fs = ump->um_fs;
if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
if (vfs_busy(mp))
return (EBUSY);
error = ffs_flushfiles(mp, flags, p);
vfs_unbusy(mp);
if (error)
return (error);
}
if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR))
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_vnodeop_p, &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 = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
devvp->v_data = mfsp;
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 = ffs_mountfs(devvp, mp, p)) {
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, p);
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 */
int
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->b_actf;
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, 0, 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 = ffs_statfs(mp, sbp, p);
sbp->f_type = MOUNT_MFS;
return (error);
}