OpenBSD-4.6/sys/ufs/mfs/mfs_vfsops.c
/* $OpenBSD: mfs_vfsops.c,v 1.39 2007/12/16 21:21:25 otto Exp $ */
/* $NetBSD: mfs_vfsops.c,v 1.10 1996/02/09 22:31:28 christos Exp $ */
/*
* Copyright (c) 1989, 1990, 1993, 1994
* 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_vfsops.c 8.4 (Berkeley) 4/16/94
*/
#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/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/kthread.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>
static int mfs_minor; /* used for building internal dev_t */
extern int (**mfs_vnodeop_p)(void *);
/*
* mfs vfs operations.
*/
const struct vfsops mfs_vfsops = {
mfs_mount,
mfs_start,
ffs_unmount,
ufs_root,
ufs_quotactl,
mfs_statfs,
ffs_sync,
ffs_vget,
ffs_fhtovp,
ffs_vptofh,
mfs_init,
ffs_sysctl,
mfs_checkexp
};
/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
int
mfs_mount(struct mount *mp, const char *path, void *data,
struct nameidata *ndp, struct proc *p)
{
struct vnode *devvp;
struct mfs_args args;
struct ufsmount *ump;
struct fs *fs;
struct mfsnode *mfsp;
size_t size;
int flags, error;
error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args));
if (error)
return (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;
error = ffs_flushfiles(mp, flags, p);
if (error)
return (error);
}
if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR))
fs->fs_ronly = 0;
#ifdef EXPORTMFS
if (args.fspec == 0)
return (vfs_export(mp, &ump->um_export,
&args.export_info));
#endif
return (0);
}
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");
mfs_minor++;
mfsp = 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)) != 0) {
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(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
bcopy(&args, &mp->mnt_stat.mount_info.mfs_args, sizeof(args));
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(struct mount *mp, int flags, struct proc *p)
{
struct vnode *vp = VFSTOUFS(mp)->um_devvp;
struct mfsnode *mfsp = VTOMFS(vp);
struct buf *bp;
int sleepreturn = 0, s;
while (1) {
while (1) {
s = splbio();
bp = mfsp->mfs_buflist;
if (bp == NULL || bp == (struct buf *)-1) {
splx(s);
break;
}
mfsp->mfs_buflist = bp->b_actf;
splx(s);
mfs_doio(mfsp, bp);
wakeup((caddr_t)bp);
}
if (bp == (struct buf *)-1)
break;
/*
* 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 (sleepreturn != 0) {
if (vfs_busy(mp, VB_WRITE|VB_NOWAIT) ||
dounmount(mp,
(CURSIG(p) == SIGKILL) ? MNT_FORCE : 0, p, NULL))
CLRSIG(p, CURSIG(p));
sleepreturn = 0;
continue;
}
sleepreturn = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0);
}
return (0);
}
/*
* Get file system statistics.
*/
int
mfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
{
int error;
error = ffs_statfs(mp, sbp, p);
strncpy(&sbp->f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN);
if (sbp != &mp->mnt_stat)
bcopy(&mp->mnt_stat.mount_info.mfs_args,
&sbp->mount_info.mfs_args, sizeof(struct mfs_args));
return (error);
}
/*
* check export permission, not supported
*/
/* ARGUSED */
int
mfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp,
struct ucred **credanonp)
{
return (EOPNOTSUPP);
}
/*
* Memory based filesystem initialization.
*/
int
mfs_init(struct vfsconf *vfsp)
{
return (ffs_init(vfsp));
}