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freebsd-nq/sys/ufs/ffs/ffs_vfsops.c
Tom Rhodes d394511de3 More s/file system/filesystem/g
2002-05-16 21:28:32 +00:00

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/*
* Copyright (c) 1989, 1991, 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.
*
* @(#)ffs_vfsops.c 8.31 (Berkeley) 5/20/95
* $FreeBSD$
*/
#include "opt_quota.h"
#include "opt_ufs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/disk.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
static MALLOC_DEFINE(M_FFSNODE, "FFS node", "FFS vnode private part");
static int ffs_sbupdate(struct ufsmount *, int);
int ffs_reload(struct mount *,struct ucred *,struct thread *);
static int ffs_oldfscompat(struct fs *);
static int ffs_init(struct vfsconf *);
static struct vfsops ufs_vfsops = {
ffs_mount,
ufs_start,
ffs_unmount,
ufs_root,
ufs_quotactl,
ffs_statfs,
ffs_sync,
ffs_vget,
ffs_fhtovp,
vfs_stdcheckexp,
ffs_vptofh,
ffs_init,
vfs_stduninit,
#ifdef UFS_EXTATTR
ufs_extattrctl,
#else
vfs_stdextattrctl,
#endif
};
VFS_SET(ufs_vfsops, ufs, 0);
/*
* ffs_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.
*/
int
ffs_mount(mp, path, data, ndp, td)
struct mount *mp; /* mount struct pointer*/
char *path; /* path to mount point*/
caddr_t data; /* arguments to FS specific mount*/
struct nameidata *ndp; /* mount point credentials*/
struct thread *td; /* process requesting mount*/
{
size_t size;
struct vnode *devvp;
struct ufs_args args;
struct ufsmount *ump = 0;
struct fs *fs;
int error, flags;
mode_t accessmode;
/*
* Use NULL path to indicate we are mounting the root filesystem.
*/
if (path == NULL) {
if ((error = bdevvp(rootdev, &rootvp))) {
printf("ffs_mountroot: can't find rootvp\n");
return (error);
}
if ((error = ffs_mountfs(rootvp, mp, td, M_FFSNODE)) != 0)
return (error);
(void)VFS_STATFS(mp, &mp->mnt_stat, td);
return (0);
}
/*
* Mounting non-root filesystem or updating a filesystem
*/
if ((error = copyin(data, (caddr_t)&args, sizeof(struct ufs_args)))!= 0)
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;
devvp = ump->um_devvp;
if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
return (error);
/*
* Flush any dirty data.
*/
VFS_SYNC(mp, MNT_WAIT, td->td_proc->p_ucred, td);
/*
* Check for and optionally get rid of files open
* for writing.
*/
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
if (mp->mnt_flag & MNT_SOFTDEP) {
error = softdep_flushfiles(mp, flags, td);
} else {
error = ffs_flushfiles(mp, flags, td);
}
if (error) {
vn_finished_write(mp);
return (error);
}
if (fs->fs_pendingblocks != 0 ||
fs->fs_pendinginodes != 0) {
printf("%s: update error: blocks %d files %d\n",
fs->fs_fsmnt, fs->fs_pendingblocks,
fs->fs_pendinginodes);
fs->fs_pendingblocks = 0;
fs->fs_pendinginodes = 0;
}
fs->fs_ronly = 1;
if ((fs->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0)
fs->fs_clean = 1;
if ((error = ffs_sbupdate(ump, MNT_WAIT)) != 0) {
fs->fs_ronly = 0;
fs->fs_clean = 0;
vn_finished_write(mp);
return (error);
}
vn_finished_write(mp);
}
if ((mp->mnt_flag & MNT_RELOAD) &&
(error = ffs_reload(mp, ndp->ni_cnd.cn_cred, td)) != 0)
return (error);
if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
if (suser(td)) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
if ((error = VOP_ACCESS(devvp, VREAD | VWRITE,
td->td_ucred, td)) != 0) {
VOP_UNLOCK(devvp, 0, td);
return (error);
}
VOP_UNLOCK(devvp, 0, td);
}
fs->fs_flags &= ~FS_UNCLEAN;
if (fs->fs_clean == 0) {
fs->fs_flags |= FS_UNCLEAN;
if ((mp->mnt_flag & MNT_FORCE) ||
((fs->fs_flags & FS_NEEDSFSCK) == 0 &&
(fs->fs_flags & FS_DOSOFTDEP))) {
printf("WARNING: %s was not %s\n",
fs->fs_fsmnt, "properly dismounted");
} else {
printf(
"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
fs->fs_fsmnt);
return (EPERM);
}
}
if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0)
return (error);
fs->fs_ronly = 0;
fs->fs_clean = 0;
if ((error = ffs_sbupdate(ump, MNT_WAIT)) != 0) {
vn_finished_write(mp);
return (error);
}
/* check to see if we need to start softdep */
if ((fs->fs_flags & FS_DOSOFTDEP) &&
(error = softdep_mount(devvp, mp, fs, td->td_ucred))){
vn_finished_write(mp);
return (error);
}
if (fs->fs_snapinum[0] != 0)
ffs_snapshot_mount(mp);
vn_finished_write(mp);
}
/*
* Soft updates is incompatible with "async",
* so if we are doing softupdates stop the user
* from setting the async flag in an update.
* Softdep_mount() clears it in an initial mount
* or ro->rw remount.
*/
if (mp->mnt_flag & MNT_SOFTDEP)
mp->mnt_flag &= ~MNT_ASYNC;
/*
* If not updating name, process export requests.
*/
if (args.fspec == 0)
return (vfs_export(mp, &args.export));
/*
* If this is a snapshot request, take the snapshot.
*/
if (mp->mnt_flag & MNT_SNAPSHOT)
return (ffs_snapshot(mp, args.fspec));
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td);
if ((error = namei(ndp)) != 0)
return (error);
NDFREE(ndp, NDF_ONLY_PNBUF);
devvp = ndp->ni_vp;
if (!vn_isdisk(devvp, &error)) {
vrele(devvp);
return (error);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
if (suser(td)) {
accessmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
if ((error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td))!= 0){
vput(devvp);
return (error);
}
VOP_UNLOCK(devvp, 0, td);
}
if (mp->mnt_flag & MNT_UPDATE) {
/*
* Update only
*
* If it's not the same vnode, or at least the same device
* then it's not correct.
*/
if (devvp != ump->um_devvp &&
devvp->v_rdev != ump->um_devvp->v_rdev)
error = EINVAL; /* needs translation */
vrele(devvp);
if (error)
return (error);
} else {
/*
* New mount
*
* We need the name for the mount point (also used for
* "last mounted on") copied in. If an error occurs,
* the mount point is discarded by the upper level code.
* Note that vfs_mount() populates f_mntonname for us.
*/
if ((error = ffs_mountfs(devvp, mp, td, M_FFSNODE)) != 0) {
vrele(devvp);
return (error);
}
}
/*
* Save "mounted from" device name info for mount point (NULL pad).
*/
copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size);
bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
/*
* Initialize filesystem stat information in mount struct.
*/
(void)VFS_STATFS(mp, &mp->mnt_stat, td);
return (0);
}
/*
* Reload all incore data for a filesystem (used after running fsck on
* the root filesystem and finding things to fix). The filesystem must
* be mounted read-only.
*
* Things to do to update the mount:
* 1) invalidate all cached meta-data.
* 2) re-read superblock from disk.
* 3) re-read summary information from disk.
* 4) invalidate all inactive vnodes.
* 5) invalidate all cached file data.
* 6) re-read inode data for all active vnodes.
*/
int
ffs_reload(mp, cred, td)
struct mount *mp;
struct ucred *cred;
struct thread *td;
{
struct vnode *vp, *nvp, *devvp;
struct inode *ip;
void *space;
struct buf *bp;
struct fs *fs, *newfs;
dev_t dev;
int i, blks, size, error;
int32_t *lp;
u_int sectorsize;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EINVAL);
/*
* Step 1: invalidate all cached meta-data.
*/
devvp = VFSTOUFS(mp)->um_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
error = vinvalbuf(devvp, 0, cred, td, 0, 0);
VOP_UNLOCK(devvp, 0, td);
if (error)
panic("ffs_reload: dirty1");
dev = devvp->v_rdev;
/*
* Only VMIO the backing device if the backing device is a real
* block device.
*/
if (vn_isdisk(devvp, NULL)) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
vfs_object_create(devvp, td, td->td_ucred);
mtx_lock(&devvp->v_interlock);
VOP_UNLOCK(devvp, LK_INTERLOCK, td);
}
/*
* Step 2: re-read superblock from disk.
*/
if (VOP_IOCTL(devvp, DIOCGSECTORSIZE, (caddr_t)&sectorsize,
FREAD, NOCRED, td) != 0)
size = DEV_BSIZE;
else
size = sectorsize;
if ((error = bread(devvp, (ufs_daddr_t)(SBOFF/size), SBSIZE, NOCRED,&bp)) != 0)
return (error);
newfs = (struct fs *)bp->b_data;
if (newfs->fs_magic != FS_MAGIC || newfs->fs_bsize > MAXBSIZE ||
newfs->fs_bsize < sizeof(struct fs)) {
brelse(bp);
return (EIO); /* XXX needs translation */
}
fs = VFSTOUFS(mp)->um_fs;
/*
* Copy pointer fields back into superblock before copying in XXX
* new superblock. These should really be in the ufsmount. XXX
* Note that important parameters (eg fs_ncg) are unchanged.
*/
newfs->fs_csp = fs->fs_csp;
newfs->fs_maxcluster = fs->fs_maxcluster;
newfs->fs_contigdirs = fs->fs_contigdirs;
newfs->fs_active = fs->fs_active;
bcopy(newfs, fs, (u_int)fs->fs_sbsize);
if (fs->fs_sbsize < SBSIZE)
bp->b_flags |= B_INVAL | B_NOCACHE;
brelse(bp);
mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
ffs_oldfscompat(fs);
/* An old fsck may have zeroed these fields, so recheck them. */
if (fs->fs_avgfilesize <= 0) /* XXX */
fs->fs_avgfilesize = AVFILESIZ; /* XXX */
if (fs->fs_avgfpdir <= 0) /* XXX */
fs->fs_avgfpdir = AFPDIR; /* XXX */
if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
printf("%s: reload pending error: blocks %d files %d\n",
fs->fs_fsmnt, fs->fs_pendingblocks, fs->fs_pendinginodes);
fs->fs_pendingblocks = 0;
fs->fs_pendinginodes = 0;
}
/*
* Step 3: re-read summary information from disk.
*/
blks = howmany(fs->fs_cssize, fs->fs_fsize);
space = fs->fs_csp;
for (i = 0; i < blks; i += fs->fs_frag) {
size = fs->fs_bsize;
if (i + fs->fs_frag > blks)
size = (blks - i) * fs->fs_fsize;
error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
NOCRED, &bp);
if (error)
return (error);
bcopy(bp->b_data, space, (u_int)size);
space = (char *)space + size;
brelse(bp);
}
/*
* We no longer know anything about clusters per cylinder group.
*/
if (fs->fs_contigsumsize > 0) {
lp = fs->fs_maxcluster;
for (i = 0; i < fs->fs_ncg; i++)
*lp++ = fs->fs_contigsumsize;
}
loop:
mtx_lock(&mntvnode_mtx);
for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
if (vp->v_mount != mp) {
mtx_unlock(&mntvnode_mtx);
goto loop;
}
nvp = TAILQ_NEXT(vp, v_nmntvnodes);
mtx_unlock(&mntvnode_mtx);
/*
* Step 4: invalidate all inactive vnodes.
*/
if (vrecycle(vp, NULL, td))
goto loop;
/*
* Step 5: invalidate all cached file data.
*/
mtx_lock(&vp->v_interlock);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
goto loop;
}
if (vinvalbuf(vp, 0, cred, td, 0, 0))
panic("ffs_reload: dirty2");
/*
* Step 6: re-read inode data for all active vnodes.
*/
ip = VTOI(vp);
error =
bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
(int)fs->fs_bsize, NOCRED, &bp);
if (error) {
vput(vp);
return (error);
}
ip->i_din = *((struct dinode *)bp->b_data +
ino_to_fsbo(fs, ip->i_number));
ip->i_effnlink = ip->i_nlink;
brelse(bp);
vput(vp);
mtx_lock(&mntvnode_mtx);
}
mtx_unlock(&mntvnode_mtx);
return (0);
}
#include <sys/sysctl.h>
int bigcgs = 0;
SYSCTL_INT(_debug, OID_AUTO, bigcgs, CTLFLAG_RW, &bigcgs, 0, "");
/*
* Common code for mount and mountroot
*/
int
ffs_mountfs(devvp, mp, td, malloctype)
struct vnode *devvp;
struct mount *mp;
struct thread *td;
struct malloc_type *malloctype;
{
struct ufsmount *ump;
struct buf *bp;
struct fs *fs;
dev_t dev;
void *space;
int error, i, blks, size, ronly;
int32_t *lp;
struct ucred *cred;
u_int64_t maxfilesize; /* XXX */
size_t strsize;
int ncount;
u_int sectorsize;
dev = devvp->v_rdev;
cred = td ? td->td_ucred : NOCRED;
/*
* Disallow multiple mounts of the same device.
* Disallow mounting of a device that is currently in use
* (except for root, which might share swap device for miniroot).
* Flush out any old buffers remaining from a previous use.
*/
error = vfs_mountedon(devvp);
if (error)
return (error);
ncount = vcount(devvp);
if (ncount > 1 && devvp != rootvp)
return (EBUSY);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
error = vinvalbuf(devvp, V_SAVE, cred, td, 0, 0);
VOP_UNLOCK(devvp, 0, td);
if (error)
return (error);
/*
* Only VMIO the backing device if the backing device is a real
* block device.
* Note that it is optional that the backing device be VMIOed. This
* increases the opportunity for metadata caching.
*/
if (vn_isdisk(devvp, NULL)) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
vfs_object_create(devvp, td, cred);
mtx_lock(&devvp->v_interlock);
VOP_UNLOCK(devvp, LK_INTERLOCK, td);
}
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
/*
* XXX: We don't re-VOP_OPEN in FREAD|FWRITE mode if the filesystem
* XXX: is subsequently remounted, so open it FREAD|FWRITE from the
* XXX: start to avoid getting trashed later on.
*/
#ifdef notyet
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td);
#else
error = VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, td);
#endif
VOP_UNLOCK(devvp, 0, td);
if (error)
return (error);
if (devvp->v_rdev->si_iosize_max != 0)
mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
if (mp->mnt_iosize_max > MAXPHYS)
mp->mnt_iosize_max = MAXPHYS;
if (VOP_IOCTL(devvp, DIOCGSECTORSIZE, (caddr_t)&sectorsize,
FREAD, cred, td) != 0)
size = DEV_BSIZE;
else
size = sectorsize;
bp = NULL;
ump = NULL;
if ((error = bread(devvp, SBLOCK, SBSIZE, cred, &bp)) != 0)
goto out;
fs = (struct fs *)bp->b_data;
if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
fs->fs_bsize < sizeof(struct fs)) {
error = EINVAL; /* XXX needs translation */
goto out;
}
fs->fs_fmod = 0;
fs->fs_flags &= ~FS_UNCLEAN;
if (fs->fs_clean == 0) {
fs->fs_flags |= FS_UNCLEAN;
if (ronly || (mp->mnt_flag & MNT_FORCE) ||
((fs->fs_flags & FS_NEEDSFSCK) == 0 &&
(fs->fs_flags & FS_DOSOFTDEP))) {
printf(
"WARNING: %s was not properly dismounted\n",
fs->fs_fsmnt);
} else {
printf(
"WARNING: R/W mount of %s denied. Filesystem is not clean - run fsck\n",
fs->fs_fsmnt);
error = EPERM;
goto out;
}
if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
printf("%s: lost blocks %d files %d\n", fs->fs_fsmnt,
fs->fs_pendingblocks, fs->fs_pendinginodes);
fs->fs_pendingblocks = 0;
fs->fs_pendinginodes = 0;
}
}
if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
printf("%s: mount pending error: blocks %d files %d\n",
fs->fs_fsmnt, fs->fs_pendingblocks, fs->fs_pendinginodes);
fs->fs_pendingblocks = 0;
fs->fs_pendinginodes = 0;
}
/* XXX updating 4.2 FFS superblocks trashes rotational layout tables */
if (fs->fs_postblformat == FS_42POSTBLFMT && !ronly) {
error = EROFS; /* needs translation */
goto out;
}
ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK | M_ZERO);
ump->um_malloctype = malloctype;
ump->um_i_effnlink_valid = 1;
ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
M_WAITOK);
ump->um_blkatoff = ffs_blkatoff;
ump->um_truncate = ffs_truncate;
ump->um_update = ffs_update;
ump->um_valloc = ffs_valloc;
ump->um_vfree = ffs_vfree;
ump->um_balloc = ffs_balloc;
bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize);
if (fs->fs_sbsize < SBSIZE)
bp->b_flags |= B_INVAL | B_NOCACHE;
brelse(bp);
bp = NULL;
fs = ump->um_fs;
fs->fs_ronly = ronly;
size = fs->fs_cssize;
blks = howmany(size, fs->fs_fsize);
if (fs->fs_contigsumsize > 0)
size += fs->fs_ncg * sizeof(int32_t);
size += fs->fs_ncg * sizeof(u_int8_t);
space = malloc((u_long)size, M_UFSMNT, M_WAITOK);
fs->fs_csp = space;
for (i = 0; i < blks; i += fs->fs_frag) {
size = fs->fs_bsize;
if (i + fs->fs_frag > blks)
size = (blks - i) * fs->fs_fsize;
if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
cred, &bp)) != 0) {
free(fs->fs_csp, M_UFSMNT);
goto out;
}
bcopy(bp->b_data, space, (u_int)size);
space = (char *)space + size;
brelse(bp);
bp = NULL;
}
if (fs->fs_contigsumsize > 0) {
fs->fs_maxcluster = lp = space;
for (i = 0; i < fs->fs_ncg; i++)
*lp++ = fs->fs_contigsumsize;
space = lp;
}
size = fs->fs_ncg * sizeof(u_int8_t);
fs->fs_contigdirs = (u_int8_t *)space;
bzero(fs->fs_contigdirs, size);
fs->fs_active = NULL;
/* Compatibility for old filesystems XXX */
if (fs->fs_avgfilesize <= 0) /* XXX */
fs->fs_avgfilesize = AVFILESIZ; /* XXX */
if (fs->fs_avgfpdir <= 0) /* XXX */
fs->fs_avgfpdir = AFPDIR; /* XXX */
mp->mnt_data = (qaddr_t)ump;
mp->mnt_stat.f_fsid.val[0] = fs->fs_id[0];
mp->mnt_stat.f_fsid.val[1] = fs->fs_id[1];
if (fs->fs_id[0] == 0 || fs->fs_id[1] == 0 ||
vfs_getvfs(&mp->mnt_stat.f_fsid))
vfs_getnewfsid(mp);
mp->mnt_maxsymlinklen = fs->fs_maxsymlinklen;
mp->mnt_flag |= MNT_LOCAL;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_nindir = fs->fs_nindir;
ump->um_bptrtodb = fs->fs_fsbtodb;
ump->um_seqinc = fs->fs_frag;
for (i = 0; i < MAXQUOTAS; i++)
ump->um_quotas[i] = NULLVP;
#ifdef UFS_EXTATTR
ufs_extattr_uepm_init(&ump->um_extattr);
#endif
devvp->v_rdev->si_mountpoint = mp;
ffs_oldfscompat(fs);
/*
* Set FS local "last mounted on" information (NULL pad)
*/
copystr( mp->mnt_stat.f_mntonname, /* mount point*/
fs->fs_fsmnt, /* copy area*/
sizeof(fs->fs_fsmnt) - 1, /* max size*/
&strsize); /* real size*/
bzero( fs->fs_fsmnt + strsize, sizeof(fs->fs_fsmnt) - strsize);
if( mp->mnt_flag & MNT_ROOTFS) {
/*
* Root mount; update timestamp in mount structure.
* this will be used by the common root mount code
* to update the system clock.
*/
mp->mnt_time = fs->fs_time;
}
ump->um_savedmaxfilesize = fs->fs_maxfilesize; /* XXX */
maxfilesize = (u_int64_t)0x40000000 * fs->fs_bsize - 1; /* XXX */
if (fs->fs_maxfilesize > maxfilesize) /* XXX */
fs->fs_maxfilesize = maxfilesize; /* XXX */
if (bigcgs) {
if (fs->fs_sparecon[0] <= 0)
fs->fs_sparecon[0] = fs->fs_cgsize;
fs->fs_cgsize = fs->fs_bsize;
}
if (ronly == 0) {
if ((fs->fs_flags & FS_DOSOFTDEP) &&
(error = softdep_mount(devvp, mp, fs, cred)) != 0) {
free(fs->fs_csp, M_UFSMNT);
goto out;
}
if (fs->fs_snapinum[0] != 0)
ffs_snapshot_mount(mp);
fs->fs_fmod = 1;
fs->fs_clean = 0;
(void) ffs_sbupdate(ump, MNT_WAIT);
}
#ifdef UFS_EXTATTR
#ifdef UFS_EXTATTR_AUTOSTART
/*
*
* Auto-starting does the following:
* - check for /.attribute in the fs, and extattr_start if so
* - for each file in .attribute, enable that file with
* an attribute of the same name.
* Not clear how to report errors -- probably eat them.
* This would all happen while the filesystem was busy/not
* available, so would effectively be "atomic".
*/
(void) ufs_extattr_autostart(mp, td);
#endif /* !UFS_EXTATTR_AUTOSTART */
#endif /* !UFS_EXTATTR */
return (0);
out:
devvp->v_rdev->si_mountpoint = NULL;
if (bp)
brelse(bp);
/* XXX: see comment above VOP_OPEN */
#ifdef notyet
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, td);
#else
(void)VOP_CLOSE(devvp, FREAD|FWRITE, cred, td);
#endif
if (ump) {
free(ump->um_fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
}
return (error);
}
/*
* Sanity checks for old filesystems.
*
* XXX - goes away some day.
*/
static int
ffs_oldfscompat(fs)
struct fs *fs;
{
fs->fs_npsect = max(fs->fs_npsect, fs->fs_nsect); /* XXX */
fs->fs_interleave = max(fs->fs_interleave, 1); /* XXX */
if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
fs->fs_nrpos = 8; /* XXX */
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
#if 0
int i; /* XXX */
u_int64_t sizepb = fs->fs_bsize; /* XXX */
/* XXX */
fs->fs_maxfilesize = fs->fs_bsize * NDADDR - 1; /* XXX */
for (i = 0; i < NIADDR; i++) { /* XXX */
sizepb *= NINDIR(fs); /* XXX */
fs->fs_maxfilesize += sizepb; /* XXX */
} /* XXX */
#endif
fs->fs_maxfilesize = (u_quad_t) 1LL << 39;
fs->fs_qbmask = ~fs->fs_bmask; /* XXX */
fs->fs_qfmask = ~fs->fs_fmask; /* XXX */
} /* XXX */
return (0);
}
/*
* unmount system call
*/
int
ffs_unmount(mp, mntflags, td)
struct mount *mp;
int mntflags;
struct thread *td;
{
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs;
int error, flags;
flags = 0;
if (mntflags & MNT_FORCE) {
flags |= FORCECLOSE;
}
#ifdef UFS_EXTATTR
if ((error = ufs_extattr_stop(mp, td))) {
if (error != EOPNOTSUPP)
printf("ffs_unmount: ufs_extattr_stop returned %d\n",
error);
} else {
ufs_extattr_uepm_destroy(&ump->um_extattr);
}
#endif
if (mp->mnt_flag & MNT_SOFTDEP) {
if ((error = softdep_flushfiles(mp, flags, td)) != 0)
return (error);
} else {
if ((error = ffs_flushfiles(mp, flags, td)) != 0)
return (error);
}
fs = ump->um_fs;
if (bigcgs) {
fs->fs_cgsize = fs->fs_sparecon[0];
fs->fs_sparecon[0] = 0;
}
if (fs->fs_pendingblocks != 0 || fs->fs_pendinginodes != 0) {
printf("%s: unmount pending error: blocks %d files %d\n",
fs->fs_fsmnt, fs->fs_pendingblocks, fs->fs_pendinginodes);
fs->fs_pendingblocks = 0;
fs->fs_pendinginodes = 0;
}
if (fs->fs_ronly == 0) {
fs->fs_clean = fs->fs_flags & (FS_UNCLEAN|FS_NEEDSFSCK) ? 0 : 1;
error = ffs_sbupdate(ump, MNT_WAIT);
if (error) {
fs->fs_clean = 0;
return (error);
}
}
ump->um_devvp->v_rdev->si_mountpoint = NULL;
vinvalbuf(ump->um_devvp, V_SAVE, NOCRED, td, 0, 0);
/* XXX: see comment above VOP_OPEN */
#ifdef notyet
error = VOP_CLOSE(ump->um_devvp, fs->fs_ronly ? FREAD : FREAD|FWRITE,
NOCRED, td);
#else
error = VOP_CLOSE(ump->um_devvp, FREAD|FWRITE, NOCRED, td);
#endif
vrele(ump->um_devvp);
free(fs->fs_csp, M_UFSMNT);
free(fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Flush out all the files in a filesystem.
*/
int
ffs_flushfiles(mp, flags, td)
struct mount *mp;
int flags;
struct thread *td;
{
struct ufsmount *ump;
int error;
ump = VFSTOUFS(mp);
#ifdef QUOTA
if (mp->mnt_flag & MNT_QUOTA) {
int i;
error = vflush(mp, 0, SKIPSYSTEM|flags);
if (error)
return (error);
for (i = 0; i < MAXQUOTAS; i++) {
if (ump->um_quotas[i] == NULLVP)
continue;
quotaoff(td, mp, i);
}
/*
* Here we fall through to vflush again to ensure
* that we have gotten rid of all the system vnodes.
*/
}
#endif
if (ump->um_devvp->v_flag & VCOPYONWRITE) {
if ((error = vflush(mp, 0, SKIPSYSTEM | flags)) != 0)
return (error);
ffs_snapshot_unmount(mp);
/*
* Here we fall through to vflush again to ensure
* that we have gotten rid of all the system vnodes.
*/
}
/*
* Flush all the files.
*/
if ((error = vflush(mp, 0, flags)) != 0)
return (error);
/*
* Flush filesystem metadata.
*/
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, td);
error = VOP_FSYNC(ump->um_devvp, td->td_ucred, MNT_WAIT, td);
VOP_UNLOCK(ump->um_devvp, 0, td);
return (error);
}
/*
* Get filesystem statistics.
*/
int
ffs_statfs(mp, sbp, td)
struct mount *mp;
struct statfs *sbp;
struct thread *td;
{
struct ufsmount *ump;
struct fs *fs;
ump = VFSTOUFS(mp);
fs = ump->um_fs;
if (fs->fs_magic != FS_MAGIC)
panic("ffs_statfs");
sbp->f_bsize = fs->fs_fsize;
sbp->f_iosize = fs->fs_bsize;
sbp->f_blocks = fs->fs_dsize;
sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
fs->fs_cstotal.cs_nffree + dbtofsb(fs, fs->fs_pendingblocks);
sbp->f_bavail = freespace(fs, fs->fs_minfree) +
dbtofsb(fs, fs->fs_pendingblocks);
sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
sbp->f_ffree = fs->fs_cstotal.cs_nifree + fs->fs_pendinginodes;
if (sbp != &mp->mnt_stat) {
sbp->f_type = mp->mnt_vfc->vfc_typenum;
bcopy((caddr_t)mp->mnt_stat.f_mntonname,
(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
}
return (0);
}
/*
* Go through the disk queues to initiate sandbagged IO;
* go through the inodes to write those that have been modified;
* initiate the writing of the super block if it has been modified.
*
* Note: we are always called with the filesystem marked `MPBUSY'.
*/
int
ffs_sync(mp, waitfor, cred, td)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct thread *td;
{
struct vnode *nvp, *vp, *devvp;
struct inode *ip;
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs;
int error, count, wait, lockreq, allerror = 0;
fs = ump->um_fs;
if (fs->fs_fmod != 0 && fs->fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->fs_fsmnt);
panic("ffs_sync: rofs mod");
}
/*
* Write back each (modified) inode.
*/
wait = 0;
lockreq = LK_EXCLUSIVE | LK_NOWAIT;
if (waitfor == MNT_WAIT) {
wait = 1;
lockreq = LK_EXCLUSIVE;
}
mtx_lock(&mntvnode_mtx);
loop:
for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) {
/*
* If the vnode that we are about to sync is no longer
* associated with this mount point, start over.
*/
if (vp->v_mount != mp)
goto loop;
/*
* Depend on the mntvnode_slock to keep things stable enough
* for a quick test. Since there might be hundreds of
* thousands of vnodes, we cannot afford even a subroutine
* call unless there's a good chance that we have work to do.
*/
nvp = TAILQ_NEXT(vp, v_nmntvnodes);
ip = VTOI(vp);
if (vp->v_type == VNON || ((ip->i_flag &
(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
TAILQ_EMPTY(&vp->v_dirtyblkhd))) {
continue;
}
if (vp->v_type != VCHR) {
mtx_unlock(&mntvnode_mtx);
if ((error = vget(vp, lockreq, td)) != 0) {
mtx_lock(&mntvnode_mtx);
if (error == ENOENT)
goto loop;
} else {
if ((error = VOP_FSYNC(vp, cred, waitfor, td)) != 0)
allerror = error;
VOP_UNLOCK(vp, 0, td);
vrele(vp);
mtx_lock(&mntvnode_mtx);
}
} else {
mtx_unlock(&mntvnode_mtx);
UFS_UPDATE(vp, wait);
mtx_lock(&mntvnode_mtx);
}
if (TAILQ_NEXT(vp, v_nmntvnodes) != nvp)
goto loop;
}
mtx_unlock(&mntvnode_mtx);
/*
* Force stale filesystem control information to be flushed.
*/
if (waitfor == MNT_WAIT) {
if ((error = softdep_flushworklist(ump->um_mountp, &count, td)))
allerror = error;
/* Flushed work items may create new vnodes to clean */
if (count) {
mtx_lock(&mntvnode_mtx);
goto loop;
}
}
#ifdef QUOTA
qsync(mp);
#endif
devvp = ump->um_devvp;
mtx_lock(&devvp->v_interlock);
if (waitfor != MNT_LAZY &&
(devvp->v_numoutput > 0 || TAILQ_FIRST(&devvp->v_dirtyblkhd))) {
mtx_unlock(&devvp->v_interlock);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
if ((error = VOP_FSYNC(devvp, cred, waitfor, td)) != 0)
allerror = error;
VOP_UNLOCK(devvp, 0, td);
if (waitfor == MNT_WAIT) {
mtx_lock(&mntvnode_mtx);
goto loop;
}
} else
mtx_unlock(&devvp->v_interlock);
/*
* Write back modified superblock.
*/
if (fs->fs_fmod != 0 && (error = ffs_sbupdate(ump, waitfor)) != 0)
allerror = error;
return (allerror);
}
/*
* Look up a FFS dinode number to find its incore vnode, otherwise read it
* in from disk. If it is in core, wait for the lock bit to clear, then
* return the inode locked. Detection and handling of mount points must be
* done by the calling routine.
*/
static int ffs_inode_hash_lock;
/*
* ffs_inode_hash_lock is a variable to manage mutual exclusion
* of vnode allocation and intertion to the hash, especially to
* avoid holding more than one vnodes for the same inode in the
* hash table. ffs_inode_hash_lock must hence be tested-and-set
* or cleared atomically, accomplished by ffs_inode_hash_mtx.
*
* As vnode allocation may block during MALLOC() and zone
* allocation, we should also do msleep() to give away the CPU
* if anyone else is allocating a vnode. lockmgr is not suitable
* here because someone else may insert to the hash table the
* vnode we are trying to allocate during our sleep, in which
* case the hash table needs to be examined once again after
* waking up.
*/
static struct mtx ffs_inode_hash_mtx;
int
ffs_vget(mp, ino, flags, vpp)
struct mount *mp;
ino_t ino;
int flags;
struct vnode **vpp;
{
struct fs *fs;
struct inode *ip;
struct ufsmount *ump;
struct buf *bp;
struct vnode *vp;
dev_t dev;
int error, want_wakeup;
ump = VFSTOUFS(mp);
dev = ump->um_dev;
restart:
if ((error = ufs_ihashget(dev, ino, flags, vpp)) != 0)
return (error);
if (*vpp != NULL)
return (0);
/*
* Lock out the creation of new entries in the FFS hash table in
* case getnewvnode() or MALLOC() blocks, otherwise a duplicate
* may occur!
*/
mtx_lock(&ffs_inode_hash_mtx);
if (ffs_inode_hash_lock) {
while (ffs_inode_hash_lock) {
ffs_inode_hash_lock = -1;
msleep(&ffs_inode_hash_lock, &ffs_inode_hash_mtx, PVM, "ffsvgt", 0);
}
mtx_unlock(&ffs_inode_hash_mtx);
goto restart;
}
ffs_inode_hash_lock = 1;
mtx_unlock(&ffs_inode_hash_mtx);
/*
* If this MALLOC() is performed after the getnewvnode()
* it might block, leaving a vnode with a NULL v_data to be
* found by ffs_sync() if a sync happens to fire right then,
* which will cause a panic because ffs_sync() blindly
* dereferences vp->v_data (as well it should).
*/
MALLOC(ip, struct inode *, sizeof(struct inode),
ump->um_malloctype, M_WAITOK);
/* Allocate a new vnode/inode. */
error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp);
if (error) {
/*
* Do not wake up processes while holding the mutex,
* otherwise the processes waken up immediately hit
* themselves into the mutex.
*/
mtx_lock(&ffs_inode_hash_mtx);
want_wakeup = ffs_inode_hash_lock < 0;
ffs_inode_hash_lock = 0;
mtx_unlock(&ffs_inode_hash_mtx);
if (want_wakeup)
wakeup(&ffs_inode_hash_lock);
*vpp = NULL;
FREE(ip, ump->um_malloctype);
return (error);
}
bzero((caddr_t)ip, sizeof(struct inode));
/*
* FFS supports lock sharing in the stack of vnodes
*/
vp->v_vnlock = &vp->v_lock;
lockinit(vp->v_vnlock, PINOD, "inode", VLKTIMEOUT, LK_CANRECURSE);
vp->v_data = ip;
ip->i_vnode = vp;
ip->i_fs = fs = ump->um_fs;
ip->i_dev = dev;
ip->i_number = ino;
#ifdef QUOTA
{
int i;
for (i = 0; i < MAXQUOTAS; i++)
ip->i_dquot[i] = NODQUOT;
}
#endif
/*
* Put it onto its hash chain and lock it so that other requests for
* this inode will block if they arrive while we are sleeping waiting
* for old data structures to be purged or for the contents of the
* disk portion of this inode to be read.
*/
ufs_ihashins(ip);
/*
* Do not wake up processes while holding the mutex,
* otherwise the processes waken up immediately hit
* themselves into the mutex.
*/
mtx_lock(&ffs_inode_hash_mtx);
want_wakeup = ffs_inode_hash_lock < 0;
ffs_inode_hash_lock = 0;
mtx_unlock(&ffs_inode_hash_mtx);
if (want_wakeup)
wakeup(&ffs_inode_hash_lock);
/* Read in the disk contents for the inode, copy into the inode. */
error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
(int)fs->fs_bsize, NOCRED, &bp);
if (error) {
/*
* The inode does not contain anything useful, so it would
* be misleading to leave it on its hash chain. With mode
* still zero, it will be unlinked and returned to the free
* list by vput().
*/
brelse(bp);
vput(vp);
*vpp = NULL;
return (error);
}
ip->i_din = *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ino));
if (DOINGSOFTDEP(vp))
softdep_load_inodeblock(ip);
else
ip->i_effnlink = ip->i_nlink;
bqrelse(bp);
/*
* Initialize the vnode from the inode, check for aliases.
* Note that the underlying vnode may have changed.
*/
error = ufs_vinit(mp, ffs_specop_p, ffs_fifoop_p, &vp);
if (error) {
vput(vp);
*vpp = NULL;
return (error);
}
/*
* Finish inode initialization now that aliasing has been resolved.
*/
ip->i_devvp = ump->um_devvp;
VREF(ip->i_devvp);
/*
* Set up a generation number for this inode if it does not
* already have one. This should only happen on old filesystems.
*/
if (ip->i_gen == 0) {
ip->i_gen = random() / 2 + 1;
if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
ip->i_flag |= IN_MODIFIED;
}
/*
* Ensure that uid and gid are correct. This is a temporary
* fix until fsck has been changed to do the update.
*/
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
ip->i_uid = ip->i_din.di_ouid; /* XXX */
ip->i_gid = ip->i_din.di_ogid; /* XXX */
} /* XXX */
*vpp = vp;
return (0);
}
/*
* File handle to vnode
*
* Have to be really careful about stale file handles:
* - check that the inode number is valid
* - call ffs_vget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
* - check that the given client host has export rights and return
* those rights via. exflagsp and credanonp
*/
int
ffs_fhtovp(mp, fhp, vpp)
struct mount *mp;
struct fid *fhp;
struct vnode **vpp;
{
struct ufid *ufhp;
struct fs *fs;
ufhp = (struct ufid *)fhp;
fs = VFSTOUFS(mp)->um_fs;
if (ufhp->ufid_ino < ROOTINO ||
ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg)
return (ESTALE);
return (ufs_fhtovp(mp, ufhp, vpp));
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
ffs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
struct inode *ip;
struct ufid *ufhp;
ip = VTOI(vp);
ufhp = (struct ufid *)fhp;
ufhp->ufid_len = sizeof(struct ufid);
ufhp->ufid_ino = ip->i_number;
ufhp->ufid_gen = ip->i_gen;
return (0);
}
/*
* Initialize the filesystem; just use ufs_init.
*/
static int
ffs_init(vfsp)
struct vfsconf *vfsp;
{
softdep_initialize();
mtx_init(&ffs_inode_hash_mtx, "ifsvgt", NULL, MTX_DEF);
return (ufs_init(vfsp));
}
/*
* Write a superblock and associated information back to disk.
*/
static int
ffs_sbupdate(mp, waitfor)
struct ufsmount *mp;
int waitfor;
{
struct fs *dfs, *fs = mp->um_fs;
struct buf *bp;
int blks;
void *space;
int i, size, error, allerror = 0;
/*
* First write back the summary information.
*/
blks = howmany(fs->fs_cssize, fs->fs_fsize);
space = fs->fs_csp;
for (i = 0; i < blks; i += fs->fs_frag) {
size = fs->fs_bsize;
if (i + fs->fs_frag > blks)
size = (blks - i) * fs->fs_fsize;
bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i),
size, 0, 0);
bcopy(space, bp->b_data, (u_int)size);
space = (char *)space + size;
if (waitfor != MNT_WAIT)
bawrite(bp);
else if ((error = bwrite(bp)) != 0)
allerror = error;
}
/*
* Now write back the superblock itself. If any errors occurred
* up to this point, then fail so that the superblock avoids
* being written out as clean.
*/
if (allerror)
return (allerror);
bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize, 0, 0);
fs->fs_fmod = 0;
fs->fs_time = time_second;
bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
/* Restore compatibility to old filesystems. XXX */
dfs = (struct fs *)bp->b_data; /* XXX */
if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
dfs->fs_nrpos = -1; /* XXX */
if (fs->fs_inodefmt < FS_44INODEFMT) { /* XXX */
int32_t *lp, tmp; /* XXX */
/* XXX */
lp = (int32_t *)&dfs->fs_qbmask; /* XXX */
tmp = lp[4]; /* XXX */
for (i = 4; i > 0; i--) /* XXX */
lp[i] = lp[i-1]; /* XXX */
lp[0] = tmp; /* XXX */
} /* XXX */
dfs->fs_maxfilesize = mp->um_savedmaxfilesize; /* XXX */
if (waitfor != MNT_WAIT)
bawrite(bp);
else if ((error = bwrite(bp)) != 0)
allerror = error;
return (allerror);
}
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