1c7c3c6a86
changes to the VM system to support the new swapper, VM bug
fixes, several VM optimizations, and some additional revamping of the
VM code. The specific bug fixes will be documented with additional
forced commits. This commit is somewhat rough in regards to code
cleanup issues.
Reviewed by: "John S. Dyson" <root@dyson.iquest.net>, "David Greenman" <dg@root.com>
469 lines
12 KiB
C
469 lines
12 KiB
C
/*
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* Copyright (c) 1989, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mfs_vfsops.c 8.11 (Berkeley) 6/19/95
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* $Id: mfs_vfsops.c,v 1.53 1999/01/01 04:14:11 dillon Exp $
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*/
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#include "opt_mfs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/linker.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <ufs/mfs/mfsnode.h>
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#include <ufs/mfs/mfs_extern.h>
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MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
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u_char * mfs_getimage __P((void));
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#ifdef MFS_ROOT
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static caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
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static u_long mfs_rootsize; /* size of mini-root in bytes */
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#endif
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static int mfs_minor; /* used for building internal dev_t */
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extern vop_t **mfs_vnodeop_p;
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static int mfs_mount __P((struct mount *mp,
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char *path, caddr_t data, struct nameidata *ndp,
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struct proc *p));
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static int mfs_start __P((struct mount *mp, int flags, struct proc *p));
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static int mfs_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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static int mfs_init __P((struct vfsconf *));
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/*
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* mfs vfs operations.
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*/
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static struct vfsops mfs_vfsops = {
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mfs_mount,
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mfs_start,
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ffs_unmount,
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ufs_root,
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ufs_quotactl,
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mfs_statfs,
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ffs_sync,
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ffs_vget,
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ffs_fhtovp,
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ffs_vptofh,
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mfs_init,
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};
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VFS_SET(mfs_vfsops, mfs, 0);
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#ifdef MFS_ROOT
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#ifdef MFS_ROOT_SIZE
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/* Image was already written into mfs_root */
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static u_char mfs_root[MFS_ROOT_SIZE*1024] = "MFS Filesystem goes here";
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static u_char end_mfs_root[] __unused = "MFS Filesystem had better STOP here";
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#endif
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u_char *
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mfs_getimage(void)
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{
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#ifdef MFS_ROOT_SIZE
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/* Get it from compiled-in code */
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return mfs_root;
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#else
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caddr_t p;
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vm_offset_t *q;
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p = preload_search_by_type("mfs_root");
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if (!p)
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return NULL;
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q = (vm_offset_t *)preload_search_info(p, MODINFO_ADDR);
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if (!q)
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return NULL;
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return (u_char *)*q;
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#endif
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}
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#endif /* MFS_ROOT */
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/*
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* mfs_mount
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*
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* Called when mounting local physical media
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*
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* PARAMETERS:
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* mountroot
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* mp mount point structure
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* path NULL (flag for root mount!!!)
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* data <unused>
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* ndp <unused>
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* p process (user credentials check [statfs])
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*
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* mount
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* mp mount point structure
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* path path to mount point
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* data pointer to argument struct in user space
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* ndp mount point namei() return (used for
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* credentials on reload), reused to look
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* up block device.
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* p process (user credentials check)
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*
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* RETURNS: 0 Success
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* !0 error number (errno.h)
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*
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* LOCK STATE:
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*
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* ENTRY
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* mount point is locked
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* EXIT
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* mount point is locked
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*
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* NOTES:
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* A NULL path can be used for a flag since the mount
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* system call will fail with EFAULT in copyinstr in
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* namei() if it is a genuine NULL from the user.
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*/
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/* ARGSUSED */
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static int
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mfs_mount(mp, path, data, ndp, p)
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register struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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struct vnode *devvp;
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struct mfs_args args;
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struct ufsmount *ump;
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struct fs *fs;
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#ifdef MFS_ROOT
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u_char *base;
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#endif
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struct mfsnode *mfsp;
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u_int size;
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int flags, err;
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/*
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* Use NULL path to flag a root mount
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*/
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if( path == NULL) {
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/*
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***
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* Mounting root file system
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***
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*/
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#ifdef MFS_ROOT
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/* Get it from preload area */
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base = mfs_getimage();
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if (!base)
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panic("No mfs_root image loaded; can't continue!");
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fs = (struct fs *)(base + SBOFF);
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/* check for valid super block */
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if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
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fs->fs_bsize < sizeof(struct fs)) {
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panic("MFS image is invalid!!");
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}
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mfs_rootbase = base;
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mfs_rootsize = fs->fs_fsize * fs->fs_size;
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rootdev = makedev(255, mfs_minor++);
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printf("rootfs is %ld Kbyte compiled in MFS\n",
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mfs_rootsize/1024);
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if ((err = bdevvp(rootdev, &rootvp))) {
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printf("mfs_mountroot: can't find rootvp");
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return (err);
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}
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/*
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* FS specific handling
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*/
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MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
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rootvp->v_data = mfsp;
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rootvp->v_op = mfs_vnodeop_p;
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rootvp->v_tag = VT_MFS;
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mfsp->mfs_baseoff = mfs_rootbase;
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mfsp->mfs_size = mfs_rootsize;
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mfsp->mfs_vnode = rootvp;
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mfsp->mfs_pid = p->p_pid;
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mfsp->mfs_active = 1;
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bufq_init(&mfsp->buf_queue);
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/* MFS wants to be read/write */
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mp->mnt_flag &= ~MNT_RDONLY;
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/*
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* Attempt mount
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*/
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if( (err = ffs_mountfs(rootvp, mp, p, M_MFSNODE)) != 0 ) {
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/* fs specific cleanup (if any)*/
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rootvp->v_data = NULL;
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FREE(mfsp, M_MFSNODE);
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goto error_1;
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}
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goto dostatfs; /* success*/
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#else /* !MFS_ROOT */
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/* you loose */
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panic("mfs_mount: mount MFS as root: not configured!");
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#endif /* MFS_ROOT */
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}
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/*
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***
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* Mounting non-root file system or updating a file system
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***
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*/
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/* copy in user arguments*/
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if (err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
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goto error_1;
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/*
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* If updating, check whether changing from read-only to
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* read/write; if there is no device name, that's all we do.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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/*
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********************
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* UPDATE
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********************
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*/
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ump = VFSTOUFS(mp);
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fs = ump->um_fs;
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if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
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flags = WRITECLOSE;
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if (mp->mnt_flag & MNT_FORCE)
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flags |= FORCECLOSE;
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err = ffs_flushfiles(mp, flags, p);
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if (err)
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goto error_1;
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}
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if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
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fs->fs_ronly = 0;
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#ifdef EXPORTMFS
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/* if not updating name...*/
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if (args.fspec == 0) {
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/*
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* Process export requests. Jumping to "success"
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* will return the vfs_export() error code.
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*/
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err = vfs_export(mp, &ump->um_export, &args.export);
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goto success;
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}
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#endif
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/* XXX MFS does not support name updating*/
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goto success;
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}
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/*
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* Do the MALLOC before the getnewvnode since doing so afterward
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* might cause a bogus v_data pointer to get dereferenced
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* elsewhere if MALLOC should block.
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*/
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MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
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err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
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if (err) {
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FREE(mfsp, M_MFSNODE);
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goto error_1;
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}
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devvp->v_type = VBLK;
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if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
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panic("mfs_mount: dup dev");
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devvp->v_data = mfsp;
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mfsp->mfs_baseoff = args.base;
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mfsp->mfs_size = args.size;
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mfsp->mfs_vnode = devvp;
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mfsp->mfs_pid = p->p_pid;
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mfsp->mfs_active = 1;
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bufq_init(&mfsp->buf_queue);
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/*
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* Since this is a new mount, we want the names for
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* the device and the mount point copied in. If an
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* error occurs, the mountpoint is discarded by the
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* upper level code.
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*/
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/* Save "last mounted on" info for mount point (NULL pad)*/
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copyinstr( path, /* mount point*/
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mp->mnt_stat.f_mntonname, /* save area*/
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MNAMELEN - 1, /* max size*/
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&size); /* real size*/
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bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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/* Save "mounted from" info for mount point (NULL pad)*/
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copyinstr( args.fspec, /* device name*/
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mp->mnt_stat.f_mntfromname, /* save area*/
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MNAMELEN - 1, /* max size*/
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&size); /* real size*/
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bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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if (err = ffs_mountfs(devvp, mp, p, M_MFSNODE)) {
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mfsp->mfs_active = 0;
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goto error_2;
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}
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#ifdef MFS_ROOT
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dostatfs:
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#endif
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/*
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* Initialize FS stat information in mount struct; uses both
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* mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
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*
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* This code is common to root and non-root mounts
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*/
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(void) VFS_STATFS(mp, &mp->mnt_stat, p);
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goto success;
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error_2: /* error with devvp held*/
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/* release devvp before failing*/
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vrele(devvp);
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error_1: /* no state to back out*/
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success:
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return( err);
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}
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static int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
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/*
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* Used to grab the process and keep it in the kernel to service
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* memory filesystem I/O requests.
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*
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* Loop servicing I/O requests.
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* Copy the requested data into or out of the memory filesystem
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* address space.
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*/
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/* ARGSUSED */
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static int
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mfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
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register struct mfsnode *mfsp = VTOMFS(vp);
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register struct buf *bp;
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register int gotsig = 0;
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/*
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* Must set P_SYSTEM to prevent system from trying to kill
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* this process. What happens is that the process is unkillable,
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* and the swapper loops trying to continuously kill it. Nor
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* can we swap out this process - not unless you want a deadlock,
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* anyway.
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*/
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curproc->p_flag |= P_SYSTEM;
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while (mfsp->mfs_active) {
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int s;
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s = splbio();
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while (bp = bufq_first(&mfsp->buf_queue)) {
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bufq_remove(&mfsp->buf_queue, bp);
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splx(s);
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mfs_doio(bp, mfsp);
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wakeup((caddr_t)bp);
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s = splbio();
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}
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splx(s);
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/*
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* If a non-ignored signal is received, try to unmount.
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* If that fails, clear the signal (it has been "processed"),
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* otherwise we will loop here, as tsleep will always return
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* EINTR/ERESTART.
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*/
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/*
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* Note that dounmount() may fail if work was queued after
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* we slept. We have to jump hoops here to make sure that we
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* process any buffers after the sleep, before we dounmount()
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*/
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if (gotsig) {
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gotsig = 0;
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if (dounmount(mp, 0, p) != 0)
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CLRSIG(p, CURSIG(p)); /* try sleep again.. */
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}
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else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
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gotsig++; /* try to unmount in next pass */
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}
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return (0);
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}
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/*
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* Get file system statistics.
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*/
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static int
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mfs_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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{
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int error;
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error = ffs_statfs(mp, sbp, p);
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sbp->f_type = mp->mnt_vfc->vfc_typenum;
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return (error);
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}
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/*
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* Memory based filesystem initialization.
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*/
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static int
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mfs_init(vfsp)
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struct vfsconf *vfsp;
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{
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return (0);
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}
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