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Remove MFS from the kernel.

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This commit is contained in:
Poul-Henning Kamp 2001-05-29 18:50:30 +00:00
parent 49b07961a9
commit 870b4959b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77417
4 changed files with 0 additions and 944 deletions
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51
sys/ufs/mfs/mfs_extern.h
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@ -1,51 +0,0 @@
/*-
* Copyright (c) 1991, 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_extern.h 8.4 (Berkeley) 3/30/95
* $FreeBSD$
*/
#ifndef _UFS_MFS_MFS_EXTERN_H_
#define _UFS_MFS_MFS_EXTERN_H_
struct buf;
struct mfsnode;
struct mount;
struct proc;
struct vnode;
void mfs_doio __P((struct buf *bp, struct mfsnode *mfsnode));
u_char *mfs_getimage __P((void));
int mfs_mountfs __P((struct vnode *, struct mount *, struct proc *));
int mfs_mountroot __P((void));
#endif /* !_UFS_MFS_MFS_EXTERN_H_ */

413
sys/ufs/mfs/mfs_vfsops.c
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@ -1,413 +0,0 @@
/*
* 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. 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 8.11 (Berkeley) 6/19/95
* $FreeBSD$
*/
#include "opt_mfs.h"
#include "opt_ufs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/linker.h>
#include <ufs/ufs/extattr.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>
MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
static int mfs_minor; /* used for building internal dev_t */
extern vop_t **mfs_vnodeop_p;
static int mfs_mount __P((struct mount *mp,
char *path, caddr_t data, struct nameidata *ndp,
struct proc *p));
static int mfs_start __P((struct mount *mp, int flags, struct proc *p));
static int mfs_statfs __P((struct mount *mp, struct statfs *sbp,
struct proc *p));
static int mfs_init __P((struct vfsconf *));
static struct cdevsw mfs_cdevsw = {
/* open */ noopen,
/* close */ noclose,
/* read */ physread,
/* write */ physwrite,
/* ioctl */ noioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "MFS",
/* maj */ 253,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ D_DISK,
};
/*
* mfs vfs operations.
*/
static struct vfsops mfs_vfsops = {
mfs_mount,
mfs_start,
ffs_unmount,
ufs_root,
ufs_quotactl,
mfs_statfs,
ffs_sync,
ffs_vget,
ffs_fhtovp,
vfs_stdcheckexp,
ffs_vptofh,
mfs_init,
vfs_stduninit,
#ifdef UFS_EXTATTR
ufs_extattrctl,
#else
vfs_stdextattrctl,
#endif
};
VFS_SET(mfs_vfsops, mfs, 0);
/*
* mfs_mount
*
* Called when mounting local physical media
*
* PARAMETERS:
* mountroot
* mp mount point structure
* path NULL (flag for root mount!!!)
* data <unused>
* ndp <unused>
* p process (user credentials check [statfs])
*
* mount
* mp mount point structure
* path path to mount point
* data pointer to argument struct in user space
* ndp mount point namei() return (used for
* credentials on reload), reused to look
* up block device.
* p process (user credentials check)
*
* RETURNS: 0 Success
* !0 error number (errno.h)
*
* LOCK STATE:
*
* ENTRY
* mount point is locked
* EXIT
* mount point is locked
*
* NOTES:
* A NULL path can be used for a flag since the mount
* system call will fail with EFAULT in copyinstr in
* namei() if it is a genuine NULL from the user.
*/
/* ARGSUSED */
static 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;
struct fs *fs;
struct mfsnode *mfsp;
size_t size;
int flags, err;
dev_t dev;
/*
* Use NULL path to flag a root mount
*/
if( path == NULL) {
/*
***
* Mounting root file system
***
*/
/* you loose */
panic("mfs_mount: mount MFS as root: not configured!");
}
/*
***
* Mounting non-root file system or updating a file system
***
*/
/* copy in user arguments*/
if ((err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) != 0)
goto error_1;
/*
* 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) {
/*
********************
* 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;
err = ffs_flushfiles(mp, flags, p);
if (err)
goto error_1;
}
if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
fs->fs_ronly = 0;
/* if not updating name...*/
if (args.fspec == 0) {
/*
* Process export requests. Jumping to "success"
* will return the vfs_export() error code.
*/
err = vfs_export(mp, &args.export);
goto success;
}
/* XXX MFS does not support name updating*/
goto success;
}
/*
* Do the MALLOC before the getnewvnode since doing so afterward
* might cause a bogus v_data pointer to get dereferenced
* elsewhere if MALLOC should block.
*/
MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
if (err) {
FREE(mfsp, M_MFSNODE);
goto error_1;
}
devvp->v_type = VCHR;
dev = makedev(mfs_cdevsw.d_maj, mfs_minor);
dev->si_devsw = &mfs_cdevsw;
/* It is not clear that these will get initialized otherwise */
dev->si_bsize_phys = DEV_BSIZE;
dev->si_iosize_max = DFLTPHYS;
devvp = addaliasu(devvp, makeudev(253, mfs_minor++));
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_active = 1;
bufq_init(&mfsp->buf_queue);
/*
* Since this is a new mount, we want the names for
* the device and the mount point copied in. If an
* error occurs, the mountpoint is discarded by the
* upper level code.
*/
/* Save "last mounted on" info for mount point (NULL pad)*/
copyinstr( path, /* mount point*/
mp->mnt_stat.f_mntonname, /* save area*/
MNAMELEN - 1, /* max size*/
&size); /* real size*/
bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
/* Save "mounted from" info for mount point (NULL pad)*/
copyinstr( args.fspec, /* device name*/
mp->mnt_stat.f_mntfromname, /* save area*/
MNAMELEN - 1, /* max size*/
&size); /* real size*/
bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
if ((err = ffs_mountfs(devvp, mp, p, M_MFSNODE)) != 0) {
mfsp->mfs_active = 0;
goto error_2;
}
/*
* Initialize FS stat information in mount struct; uses both
* mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
*
* This code is common to root and non-root mounts
*/
(void) VFS_STATFS(mp, &mp->mnt_stat, p);
goto success;
error_2: /* error with devvp held*/
/* release devvp before failing*/
vrele(devvp);
error_1: /* no state to back out*/
success:
return( err);
}
static 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 */
static 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 int gotsig = 0, sig;
/*
* We must prevent the system from trying to swap
* out or kill ( when swap space is low, see vm/pageout.c ) the
* process. A deadlock can occur if the process is swapped out,
* and the system can loop trying to kill the unkillable ( while
* references exist ) MFS process when swap space is low.
*/
PHOLD(curproc);
while (mfsp->mfs_active) {
int s;
s = splbio();
while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
bufq_remove(&mfsp->buf_queue, bp);
splx(s);
mfs_doio(bp, mfsp);
wakeup((caddr_t)bp);
s = splbio();
}
splx(s);
/*
* 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.
*/
/*
* Note that dounmount() may fail if work was queued after
* we slept. We have to jump hoops here to make sure that we
* process any buffers after the sleep, before we dounmount()
*/
if (gotsig) {
gotsig = 0;
if (dounmount(mp, 0, p) != 0) {
sig = CURSIG(p);
if (sig) {
PROC_LOCK(p);
SIGDELSET(p->p_siglist, sig);
PROC_UNLOCK(p);
}
}
}
else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
gotsig++; /* try to unmount in next pass */
}
return (0);
}
/*
* Get file system statistics.
*/
static int
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 = mp->mnt_vfc->vfc_typenum;
return (error);
}
/*
* Memory based filesystem initialization.
*/
static int
mfs_init(vfsp)
struct vfsconf *vfsp;
{
cdevsw_add(&mfs_cdevsw);
return (0);
}

416
sys/ufs/mfs/mfs_vnops.c
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@ -1,416 +0,0 @@
/*
* Copyright (c) 1989, 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_vnops.c 8.11 (Berkeley) 5/22/95
* $FreeBSD$
*/
#include "opt_ufs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/sysproto.h>
#include <sys/mman.h>
#include <ufs/ufs/extattr.h>
#include <ufs/mfs/mfsnode.h>
#include <ufs/mfs/mfs_extern.h>
static int mfs_badop __P((struct vop_generic_args *));
static int mfs_close __P((struct vop_close_args *));
static int mfs_fsync __P((struct vop_fsync_args *));
static int mfs_freeblks __P((struct vop_freeblks_args *));
static int mfs_inactive __P((struct vop_inactive_args *)); /* XXX */
static int mfs_open __P((struct vop_open_args *));
static int mfs_reclaim __P((struct vop_reclaim_args *)); /* XXX */
static int mfs_print __P((struct vop_print_args *)); /* XXX */
static int mfs_strategy __P((struct vop_strategy_args *)); /* XXX */
static int mfs_getpages __P((struct vop_getpages_args *)); /* XXX */
/*
* mfs vnode operations.
*/
vop_t **mfs_vnodeop_p;
static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *) mfs_badop },
{ &vop_bmap_desc, (vop_t *) vop_stdbmap },
{ &vop_close_desc, (vop_t *) mfs_close },
{ &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject },
{ &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject },
{ &vop_freeblks_desc, (vop_t *) mfs_freeblks },
{ &vop_fsync_desc, (vop_t *) mfs_fsync },
#ifdef UFS_EXTATTR
{ &vop_getextattr_desc, (vop_t *) ufs_vop_getextattr },
#endif
{ &vop_getpages_desc, (vop_t *) mfs_getpages },
{ &vop_getvobject_desc, (vop_t *) vop_stdgetvobject },
{ &vop_inactive_desc, (vop_t *) mfs_inactive },
{ &vop_ioctl_desc, (vop_t *) vop_enotty },
{ &vop_islocked_desc, (vop_t *) vop_defaultop },
{ &vop_lock_desc, (vop_t *) vop_defaultop },
{ &vop_open_desc, (vop_t *) mfs_open },
{ &vop_print_desc, (vop_t *) mfs_print },
{ &vop_reclaim_desc, (vop_t *) mfs_reclaim },
#ifdef UFS_EXTATTR
{ &vop_setextattr_desc, (vop_t *) ufs_vop_setextattr },
#endif
{ &vop_strategy_desc, (vop_t *) mfs_strategy },
{ &vop_unlock_desc, (vop_t *) vop_defaultop },
{ &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
{ NULL, NULL }
};
static struct vnodeopv_desc mfs_vnodeop_opv_desc =
{ &mfs_vnodeop_p, mfs_vnodeop_entries };
VNODEOP_SET(mfs_vnodeop_opv_desc);
/*
* Vnode Operations.
*
* Open called to allow memory filesystem to initialize and
* validate before actual IO. Record our process identifier
* so we can tell when we are doing I/O to ourself.
*/
/* ARGSUSED */
static int
mfs_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
if (ap->a_vp->v_type != VCHR)
panic("mfs_open not VCHR");
return (0);
}
static int
mfs_fsync(ap)
struct vop_fsync_args *ap;
{
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap));
}
/*
* mfs_freeblks() - hook to allow us to free physical memory.
*
* We implement the BIO_DELETE strategy. We can't just madvise()
* here because we have to do it in the correct order vs other bio
* requests, so we queue it.
*
* Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
* throw-away on brelse()? XXX
*/
static int
mfs_freeblks(ap)
struct vop_freeblks_args /* {
struct vnode *a_vp;
daddr_t a_addr;
daddr_t a_length;
} */ *ap;
{
struct buf *bp;
struct vnode *vp;
if (!vfinddev(ap->a_vp->v_rdev, VCHR, &vp) || vp->v_usecount == 0)
panic("mfs_freeblks: bad dev");
bp = geteblk(ap->a_length);
bp->b_flags |= B_ASYNC;
bp->b_iocmd = BIO_DELETE;
bp->b_dev = ap->a_vp->v_rdev;
bp->b_blkno = ap->a_addr;
bp->b_offset = dbtob(ap->a_addr);
bp->b_bcount = ap->a_length;
BUF_KERNPROC(bp);
VOP_STRATEGY(vp, bp);
return(0);
}
/*
* Pass I/O requests to the memory filesystem process.
*/
static int
mfs_strategy(ap)
struct vop_strategy_args /* {
struct vnode *a_vp;
struct bio *a_bp;
} */ *ap;
{
register struct buf *bp = (struct buf *)ap->a_bp;
register struct mfsnode *mfsp;
struct vnode *vp;
struct proc *p = curproc; /* XXX */
int s;
if (!vfinddev(bp->b_dev, VCHR, &vp) || vp->v_usecount == 0)
panic("mfs_strategy: bad dev");
mfsp = VTOMFS(vp);
/*
* splbio required for queueing/dequeueing, in case of forwarded
* BPs from bio interrupts (?). It may not be necessary.
*/
s = splbio();
if (mfsp->mfs_pid == 0) {
/*
* mini-root. Note: BIO_DELETE not supported at the moment,
* I'm not sure what kind of dataspace b_data is in.
*/
caddr_t base;
base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
if (bp->b_iocmd == BIO_DELETE)
;
if (bp->b_iocmd == BIO_READ)
bcopy(base, bp->b_data, bp->b_bcount);
else
bcopy(bp->b_data, base, bp->b_bcount);
bufdone(bp);
} else if (mfsp->mfs_pid == p->p_pid) {
/*
* VOP to self
*/
splx(s);
mfs_doio(bp, mfsp);
s = splbio();
} else {
/*
* VOP from some other process, queue to MFS process and
* wake it up.
*/
bufq_insert_tail(&mfsp->buf_queue, bp);
wakeup((caddr_t)vp);
}
splx(s);
return (0);
}
/*
* Memory file system I/O.
*
* Trivial on the HP since buffer has already been mapping into KVA space.
*
* Read and Write are handled with a simple copyin and copyout.
*
* We also partially support VOP_FREEBLKS() via BIO_DELETE. We can't implement
* completely -- for example, on fragments or inode metadata, but we can
* implement it for page-aligned requests.
*/
void
mfs_doio(bp, mfsp)
register struct buf *bp;
struct mfsnode *mfsp;
{
caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
if (bp->b_iocmd == BIO_DELETE) {
/*
* Implement BIO_DELETE, which allows the filesystem to tell
* a block device when blocks are no longer needed (like when
* a file is deleted). We use the hook to MADV_FREE the VM.
* This makes an MFS filesystem work as well or better then
* a sun-style swap-mounted filesystem.
*/
int bytes = bp->b_bcount;
if ((vm_offset_t)base & PAGE_MASK) {
int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
bytes -= n;
base += n;
}
if (bytes > 0) {
struct madvise_args uap;
bytes &= ~PAGE_MASK;
if (bytes != 0) {
bzero(&uap, sizeof(uap));
uap.addr = base;
uap.len = bytes;
uap.behav = MADV_FREE;
madvise(curproc, &uap);
}
}
bp->b_error = 0;
} else if (bp->b_iocmd == BIO_READ) {
/*
* Read data from our 'memory' disk
*/
bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
} else {
/*
* Write data to our 'memory' disk
*/
bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
}
if (bp->b_error)
bp->b_ioflags |= BIO_ERROR;
bufdone(bp);
}
/*
* Memory filesystem close routine
*/
/* ARGSUSED */
static int
mfs_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct mfsnode *mfsp = VTOMFS(vp);
register struct buf *bp;
int error;
/*
* Finish any pending I/O requests.
*/
while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
bufq_remove(&mfsp->buf_queue, bp);
mfs_doio(bp, mfsp);
wakeup((caddr_t)bp);
}
/*
* On last close of a memory filesystem
* we must invalidate any in core blocks, so that
* we can, free up its vnode.
*/
if ((error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0)) != 0)
return (error);
/*
* There should be no way to have any more uses of this
* vnode, so if we find any other uses, it is a panic.
*/
if (vp->v_usecount > 1)
printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL))
panic("mfs_close");
/*
* Send a request to the filesystem server to exit.
*/
mfsp->mfs_active = 0;
wakeup((caddr_t)vp);
return (0);
}
/*
* Memory filesystem inactive routine
*/
/* ARGSUSED */
static int
mfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct mfsnode *mfsp = VTOMFS(vp);
if (bufq_first(&mfsp->buf_queue) != NULL)
panic("mfs_inactive: not inactive (next buffer %p)",
bufq_first(&mfsp->buf_queue));
VOP_UNLOCK(vp, 0, ap->a_p);
return (0);
}
/*
* Reclaim a memory filesystem devvp so that it can be reused.
*/
static int
mfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
FREE(vp->v_data, M_MFSNODE);
vp->v_data = NULL;
return (0);
}
/*
* Print out the contents of an mfsnode.
*/
static int
mfs_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
printf("tag VT_MFS, pid %ld, base %p, size %ld\n",
(long)mfsp->mfs_pid, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
return (0);
}
/*
* Block device bad operation
*/
static int
mfs_badop(struct vop_generic_args *ap)
{
int i;
printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
i = vop_defaultop(ap);
printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i);
return (i);
}
static int
mfs_getpages(ap)
struct vop_getpages_args *ap;
{
return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap));
}

64
sys/ufs/mfs/mfsnode.h
View File

@ -1,64 +0,0 @@
/*
* Copyright (c) 1989, 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.
*
* @(#)mfsnode.h 8.3 (Berkeley) 5/19/95
* $FreeBSD$
*/
#ifndef _UFS_MFS_MFSNODE_H_
#define _UFS_MFS_MFSNODE_H_
/*
* This structure defines the control data for the memory based file system.
*/
struct mfsnode {
struct vnode *mfs_vnode; /* vnode associated with this mfsnode */
caddr_t mfs_baseoff; /* base of file system in memory */
long mfs_size; /* size of memory file system */
pid_t mfs_pid; /* supporting process pid */
struct buf_queue_head buf_queue; /* list of I/O requests */
int mfs_active;
long mfs_spare[1];
};
/*
* Convert between mfsnode pointers and vnode pointers
*/
#define VTOMFS(vp) ((struct mfsnode *)(vp)->v_data)
#define MFSTOV(mfsp) ((mfsp)->mfs_vnode)
#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_MFSNODE);
#endif
#endif