439 lines
11 KiB
C
439 lines
11 KiB
C
/* $NetBSD: mfs_vfsops.c,v 1.61 2004/07/05 07:28:46 pk Exp $ */
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/*
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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. 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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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mfs_vfsops.c,v 1.61 2004/07/05 07:28:46 pk Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_compat_netbsd.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/time.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 <miscfs/syncfs/syncfs.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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caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
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u_long mfs_rootsize; /* size of mini-root in bytes */
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static int mfs_minor; /* used for building internal dev_t */
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extern int (**mfs_vnodeop_p) __P((void *));
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MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
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/*
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* mfs vfs operations.
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*/
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extern const struct vnodeopv_desc mfs_vnodeop_opv_desc;
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const struct vnodeopv_desc * const mfs_vnodeopv_descs[] = {
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&mfs_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops mfs_vfsops = {
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MOUNT_MFS,
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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_statvfs,
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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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mfs_reinit,
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mfs_done,
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NULL,
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NULL,
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ufs_check_export,
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(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
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mfs_vnodeopv_descs,
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};
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SYSCTL_SETUP(sysctl_vfs_mfs_setup, "sysctl vfs.mfs subtree setup")
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "vfs", NULL,
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NULL, 0, NULL, 0,
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CTL_VFS, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_ALIAS,
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CTLTYPE_NODE, "mfs",
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SYSCTL_DESCR("Memory based file system"),
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NULL, 1, NULL, 0,
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CTL_VFS, 3, CTL_EOL);
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/*
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* XXX the "1" and the "3" above could be dynamic, thereby
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* eliminating one more instance of the "number to vfs"
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* mapping problem, but they are in order as taken from
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* sys/mount.h
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*/
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}
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/*
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* Memory based filesystem initialization.
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*/
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void
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mfs_init()
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{
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#ifdef _LKM
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malloc_type_attach(M_MFSNODE);
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#endif
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/*
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* ffs_init() ensures to initialize necessary resources
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* only once.
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*/
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ffs_init();
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}
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void
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mfs_reinit()
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{
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ffs_reinit();
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}
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void
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mfs_done()
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{
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/*
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* ffs_done() ensures to free necessary resources
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* only once, when it's no more needed.
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*/
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ffs_done();
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#ifdef _LKM
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malloc_type_detach(M_MFSNODE);
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#endif
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}
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/*
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* Called by main() when mfs is going to be mounted as root.
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*/
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int
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mfs_mountroot()
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{
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struct fs *fs;
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struct mount *mp;
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struct proc *p = curproc; /* XXX */
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struct ufsmount *ump;
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struct mfsnode *mfsp;
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int error = 0;
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/*
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* Get vnodes for rootdev.
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*/
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if (bdevvp(rootdev, &rootvp)) {
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printf("mfs_mountroot: can't setup bdevvp's");
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return (error);
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}
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if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) {
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vrele(rootvp);
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return (error);
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}
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mfsp = malloc(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_proc = NULL; /* indicate kernel space */
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mfsp->mfs_shutdown = 0;
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bufq_alloc(&mfsp->mfs_buflist, BUFQ_FCFS);
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if ((error = ffs_mountfs(rootvp, mp, p)) != 0) {
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mp->mnt_op->vfs_refcount--;
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vfs_unbusy(mp);
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bufq_free(&mfsp->mfs_buflist);
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free(mp, M_MOUNT);
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free(mfsp, M_MFSNODE);
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vrele(rootvp);
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return (error);
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}
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simple_lock(&mountlist_slock);
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CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
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simple_unlock(&mountlist_slock);
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mp->mnt_vnodecovered = NULLVP;
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ump = VFSTOUFS(mp);
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fs = ump->um_fs;
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(void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0);
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(void)ffs_statvfs(mp, &mp->mnt_stat, p);
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vfs_unbusy(mp);
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return (0);
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}
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/*
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* This is called early in boot to set the base address and size
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* of the mini-root.
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*/
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int
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mfs_initminiroot(base)
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caddr_t base;
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{
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struct fs *fs = (struct fs *)(base + SBLOCK_UFS1);
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/* check for valid super block */
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if (fs->fs_magic != FS_UFS1_MAGIC || fs->fs_bsize > MAXBSIZE ||
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fs->fs_bsize < sizeof(struct fs))
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return (0);
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mountroot = mfs_mountroot;
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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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mfs_minor++;
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return (mfs_rootsize);
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}
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/*
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* VFS Operations.
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*
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* mount system call
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*/
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/* ARGSUSED */
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int
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mfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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const char *path;
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void *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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struct mfsnode *mfsp;
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int flags, error;
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if (mp->mnt_flag & MNT_GETARGS) {
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struct vnode *vp;
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struct mfsnode *mfsp;
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ump = VFSTOUFS(mp);
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if (ump == NULL)
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return EIO;
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vp = ump->um_devvp;
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if (vp == NULL)
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return EIO;
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mfsp = VTOMFS(vp);
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if (mfsp == NULL)
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return EIO;
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args.fspec = NULL;
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vfs_showexport(mp, &args.export, &ump->um_export);
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args.base = mfsp->mfs_baseoff;
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args.size = mfsp->mfs_size;
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return copyout(&args, data, sizeof(args));
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}
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/*
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* XXX turn off async to avoid hangs when writing lots of data.
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* the problem is that MFS needs to allocate pages to clean pages,
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* so if we wait until the last minute to clean pages then there
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* may not be any pages available to do the cleaning.
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* ... and since the default partially-synchronous mode turns out
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* to not be sufficient under heavy load, make it full synchronous.
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*/
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mp->mnt_flag &= ~MNT_ASYNC;
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mp->mnt_flag |= MNT_SYNCHRONOUS;
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error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args));
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if (error)
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return (error);
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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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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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error = ffs_flushfiles(mp, flags, p);
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if (error)
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return (error);
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}
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if (fs->fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR))
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fs->fs_ronly = 0;
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if (args.fspec == 0)
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return (vfs_export(mp, &ump->um_export, &args.export));
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return (0);
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}
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error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
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if (error)
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return (error);
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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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mfs_minor++;
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mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
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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_proc = p;
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mfsp->mfs_shutdown = 0;
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bufq_alloc(&mfsp->mfs_buflist, BUFQ_FCFS);
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if ((error = ffs_mountfs(devvp, mp, p)) != 0) {
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mfsp->mfs_shutdown = 1;
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vrele(devvp);
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return (error);
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}
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ump = VFSTOUFS(mp);
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fs = ump->um_fs;
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error = set_statvfs_info(path, UIO_USERSPACE, args.fspec,
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UIO_USERSPACE, mp, p);
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if (error)
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return error;
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(void)strncpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname,
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sizeof(fs->fs_fsmnt));
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fs->fs_fsmnt[sizeof(fs->fs_fsmnt) - 1] = '\0';
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/* XXX: cleanup on error */
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return 0;
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}
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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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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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struct vnode *vp = VFSTOUFS(mp)->um_devvp;
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struct mfsnode *mfsp = VTOMFS(vp);
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struct buf *bp;
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caddr_t base;
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int sleepreturn = 0;
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struct lwp *l; /* XXX NJWLWP */
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/* XXX NJWLWP the vnode interface again gives us a proc in a
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* place where we want a execution context. Cheat.
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*/
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KASSERT(curproc == p);
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l = curlwp;
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base = mfsp->mfs_baseoff;
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while (mfsp->mfs_shutdown != 1) {
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while ((bp = BUFQ_GET(&mfsp->mfs_buflist)) != NULL) {
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mfs_doio(bp, base);
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wakeup((caddr_t)bp);
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}
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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, or the filesystem is already in the
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* process of being unmounted, clear the signal (it has been
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* "processed"), otherwise we will loop here, as tsleep
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* will always return EINTR/ERESTART.
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*/
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if (sleepreturn != 0) {
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/*
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* XXX Freeze syncer. Must do this before locking
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* the mount point. See dounmount() for details.
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*/
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lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL);
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if (vfs_busy(mp, LK_NOWAIT, 0) != 0)
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lockmgr(&syncer_lock, LK_RELEASE, NULL);
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else if (dounmount(mp, 0, p) != 0)
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CLRSIG(p, CURSIG(l));
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sleepreturn = 0;
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continue;
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}
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sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0);
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}
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KASSERT(BUFQ_PEEK(&mfsp->mfs_buflist) == NULL);
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bufq_free(&mfsp->mfs_buflist);
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return (sleepreturn);
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}
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/*
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* Get file system statistics.
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*/
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int
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mfs_statvfs(mp, sbp, p)
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struct mount *mp;
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struct statvfs *sbp;
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struct proc *p;
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{
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int error;
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error = ffs_statvfs(mp, sbp, p);
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if (error)
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return error;
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(void)strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name,
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sizeof(sbp->f_fstypename));
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sbp->f_fstypename[sizeof(sbp->f_fstypename) - 1] = '\0';
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return 0;
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}
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