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freebsd-nq/sys/ufs/ffs/ffs_vfsops.c
Julian Elischer 3f6f17ee1e Submitted by: Archie and me. 
We encountered an interesting situation where the superblock for
a file system got written to disk with the "fs_fmod" flag set to
one. It appears that this flag is normally supposed to be cleared
during ffs_sync(), but we experienced a crash, or some other weird
occurrence that left it on the disk set to 1.

Later this partition was mounted read-only... and the fs_fmod
field was never cleared, causing ffs_sync() to panic "rofs mod"
when trying to unmount that filesystem (ffs_vfsops.c: line 790).

fix:
set this bit to 0 when you load the superblock from disk.
(see more complete mail on this to hackers)
1996-11-13 01:45:56 +00:00

1077 lines
26 KiB
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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 8.8 (Berkeley) 4/18/94
* $Id: ffs_vfsops.c,v 1.41 1996/09/07 17:34:57 dyson Exp $
*/
#include "opt_quota.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/socket.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <miscfs/specfs/specdev.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_param.h>
#include <vm/vm_prot.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
static int ffs_sbupdate __P((struct ufsmount *, int));
static int ffs_reload __P((struct mount *,struct ucred *,struct proc *));
static int ffs_oldfscompat __P((struct fs *));
static int ffs_mount __P((struct mount *,
char *, caddr_t, struct nameidata *, struct proc *));
struct vfsops ufs_vfsops = {
ffs_mount,
ufs_start,
ffs_unmount,
ufs_root,
ufs_quotactl,
ffs_statfs,
ffs_sync,
ffs_vget,
ffs_fhtovp,
ffs_vptofh,
ffs_init,
};
VFS_SET(ufs_vfsops, ufs, MOUNT_UFS, 0);
extern u_long nextgennumber;
/*
* 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.
*/
static int
ffs_mount( mp, path, data, ndp, p)
register 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 proc *p; /* process requesting mount*/
{
u_int size;
int err = 0;
struct vnode *devvp;
struct ufs_args args;
struct ufsmount *ump = 0;
register struct fs *fs;
int flags;
/*
* Use NULL path to flag a root mount
*/
if( path == NULL) {
/*
***
* Mounting root file system
***
*/
/* Get vnode for root device*/
if( bdevvp( rootdev, &rootvp))
panic("ffs_mountroot: can't setup bdevvp for root");
/*
* FS specific handling
*/
mp->mnt_flag |= MNT_RDONLY; /* XXX globally applicable?*/
/*
* Attempt mount
*/
if( ( err = ffs_mountfs(rootvp, mp, p)) != 0) {
/* fs specific cleanup (if any)*/
goto error_1;
}
goto dostatfs; /* success*/
}
/*
***
* Mounting non-root file system or updating a file system
***
*/
/* copy in user arguments*/
err = copyin(data, (caddr_t)&args, sizeof (struct ufs_args));
if (err)
goto error_1; /* can't get arguments*/
/*
* 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;
err = 0;
if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
if (vfs_busy(mp)) {
err = EBUSY;
goto error_1;
}
err = ffs_flushfiles(mp, flags, p);
vfs_unbusy(mp);
}
if (!err && (mp->mnt_flag & MNT_RELOAD))
err = ffs_reload(mp, ndp->ni_cnd.cn_cred, p);
if (err) {
goto error_1;
}
if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) {
if (!fs->fs_clean) {
if (mp->mnt_flag & MNT_FORCE) {
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);
err = EPERM;
goto error_1;
}
}
fs->fs_ronly = 0;
}
if (fs->fs_ronly == 0) {
fs->fs_clean = 0;
ffs_sbupdate(ump, MNT_WAIT);
}
/* 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, &ump->um_export, &args.export);
goto success;
}
}
/*
* 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, p);
err = namei(ndp);
if (err) {
/* can't get devvp!*/
goto error_1;
}
devvp = ndp->ni_vp;
if (devvp->v_type != VBLK) {
err = ENOTBLK;
goto error_2;
}
if (major(devvp->v_rdev) >= nblkdev) {
err = ENXIO;
goto error_2;
}
if (mp->mnt_flag & MNT_UPDATE) {
/*
********************
* UPDATE
********************
*/
if (devvp != ump->um_devvp)
err = EINVAL; /* needs translation */
else
vrele(devvp);
/*
* Update device name only on success
*/
if( !err) {
/* Save "mounted from" 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);
}
} else {
/*
********************
* NEW MOUNT
********************
*/
/*
* 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);
err = ffs_mountfs(devvp, mp, p);
}
if (err) {
goto error_2;
}
dostatfs:
/*
* 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);
}
/*
* 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.
*/
static int
ffs_reload(mp, cred, p)
register struct mount *mp;
struct ucred *cred;
struct proc *p;
{
register struct vnode *vp, *nvp, *devvp;
struct inode *ip;
struct csum *space;
struct buf *bp;
struct fs *fs;
int i, blks, size, error;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EINVAL);
/*
* Step 1: invalidate all cached meta-data.
*/
devvp = VFSTOUFS(mp)->um_devvp;
if (vinvalbuf(devvp, 0, cred, p, 0, 0))
panic("ffs_reload: dirty1");
/*
* Step 2: re-read superblock from disk.
*/
error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp);
if (error)
return (error);
fs = (struct fs *)bp->b_data;
fs->fs_fmod = 0;
if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
fs->fs_bsize < sizeof(struct fs)) {
brelse(bp);
return (EIO); /* XXX needs translation */
}
fs = VFSTOUFS(mp)->um_fs;
bcopy(&fs->fs_csp[0], &((struct fs *)bp->b_data)->fs_csp[0],
sizeof(fs->fs_csp));
bcopy(bp->b_data, fs, (u_int)fs->fs_sbsize);
if (fs->fs_sbsize < SBSIZE)
bp->b_flags |= B_INVAL;
brelse(bp);
ffs_oldfscompat(fs);
/*
* Step 3: re-read summary information from disk.
*/
blks = howmany(fs->fs_cssize, fs->fs_fsize);
space = fs->fs_csp[0];
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, fs->fs_csp[fragstoblks(fs, i)], (u_int)size);
brelse(bp);
}
loop:
for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
nvp = vp->v_mntvnodes.le_next;
/*
* Step 4: invalidate all inactive vnodes.
*/
if (vp->v_usecount == 0) {
vgone(vp);
continue;
}
/*
* Step 5: invalidate all cached file data.
*/
if (vget(vp, 1))
goto loop;
if (vinvalbuf(vp, 0, cred, p, 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));
brelse(bp);
vput(vp);
if (vp->v_mount != mp)
goto loop;
}
return (0);
}
/*
* Common code for mount and mountroot
*/
int
ffs_mountfs(devvp, mp, p)
register struct vnode *devvp;
struct mount *mp;
struct proc *p;
{
register struct ufsmount *ump;
struct buf *bp;
register struct fs *fs;
dev_t dev = devvp->v_rdev;
struct partinfo dpart;
caddr_t base, space;
int havepart = 0, blks;
int error, i, size;
int ronly;
u_int strsize;
int ncount;
/*
* 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 (devvp->v_object)
ncount -= 1;
if (ncount > 1 && devvp != rootvp)
return (EBUSY);
error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0);
if (error)
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
if (error)
return (error);
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
size = DEV_BSIZE;
else {
havepart = 1;
size = dpart.disklab->d_secsize;
}
bp = NULL;
ump = NULL;
error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp);
if (error)
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;
if (!fs->fs_clean) {
if (ronly || (mp->mnt_flag & MNT_FORCE)) {
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;
}
}
ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
bzero((caddr_t)ump, sizeof *ump);
ump->um_fs = malloc((u_long)fs->fs_sbsize, M_UFSMNT,
M_WAITOK);
bcopy(bp->b_data, ump->um_fs, (u_int)fs->fs_sbsize);
if (fs->fs_sbsize < SBSIZE)
bp->b_flags |= B_INVAL;
brelse(bp);
bp = NULL;
fs = ump->um_fs;
fs->fs_ronly = ronly;
if (ronly == 0) {
fs->fs_fmod = 1;
fs->fs_clean = 0;
}
blks = howmany(fs->fs_cssize, fs->fs_fsize);
base = space = malloc((u_long)fs->fs_cssize, M_UFSMNT,
M_WAITOK);
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) {
free(base, M_UFSMNT);
goto out;
}
bcopy(bp->b_data, space, (u_int)size);
fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
space += size;
brelse(bp);
bp = NULL;
}
mp->mnt_data = (qaddr_t)ump;
mp->mnt_stat.f_fsid.val[0] = (long)dev;
mp->mnt_stat.f_fsid.val[1] = MOUNT_UFS;
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;
devvp->v_specflags |= SI_MOUNTEDON;
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;
}
if (ronly == 0)
ffs_sbupdate(ump, MNT_WAIT);
/*
* Only VMIO the backing device if the backing device is a real
* block device. This excludes the original MFS implementation.
* Note that it is optional that the backing device be VMIOed. This
* increases the opportunity for metadata caching.
*/
if ((devvp->v_type == VBLK) && (major(devvp->v_rdev) < nblkdev)) {
vfs_object_create(devvp, p, p->p_ucred, 0);
}
return (0);
out:
if (bp)
brelse(bp);
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
if (ump) {
free(ump->um_fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
}
return (error);
}
/*
* Sanity checks for old file systems.
*
* 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 */
quad_t sizepb = fs->fs_bsize; /* 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, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct ufsmount *ump;
register struct fs *fs;
int error, flags, ronly;
flags = 0;
if (mntflags & MNT_FORCE) {
flags |= FORCECLOSE;
}
error = ffs_flushfiles(mp, flags, p);
if (error)
return (error);
ump = VFSTOUFS(mp);
fs = ump->um_fs;
ronly = fs->fs_ronly;
if (!ronly) {
fs->fs_clean = 1;
ffs_sbupdate(ump, MNT_WAIT);
}
ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
VOP_LOCK(ump->um_devvp);
vnode_pager_uncache(ump->um_devvp);
VOP_UNLOCK(ump->um_devvp);
error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
NOCRED, p);
vrele(ump->um_devvp);
free(fs->fs_csp[0], 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, p)
register struct mount *mp;
int flags;
struct proc *p;
{
register struct ufsmount *ump;
int error;
if (!doforce)
flags &= ~FORCECLOSE;
ump = VFSTOUFS(mp);
#ifdef QUOTA
if (mp->mnt_flag & MNT_QUOTA) {
int i;
error = vflush(mp, NULLVP, SKIPSYSTEM|flags);
if (error)
return (error);
for (i = 0; i < MAXQUOTAS; i++) {
if (ump->um_quotas[i] == NULLVP)
continue;
quotaoff(p, mp, i);
}
/*
* Here we fall through to vflush again to ensure
* that we have gotten rid of all the system vnodes.
*/
}
#endif
error = vflush(mp, NULLVP, flags);
return (error);
}
/*
* Get file system statistics.
*/
int
ffs_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct ufsmount *ump;
register struct fs *fs;
ump = VFSTOUFS(mp);
fs = ump->um_fs;
if (fs->fs_magic != FS_MAGIC)
panic("ffs_statfs");
sbp->f_type = MOUNT_UFS;
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;
sbp->f_bavail = freespace(fs, fs->fs_minfree);
sbp->f_files = fs->fs_ncg * fs->fs_ipg - ROOTINO;
sbp->f_ffree = fs->fs_cstotal.cs_nifree;
if (sbp != &mp->mnt_stat) {
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, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
register struct vnode *vp, *nvp;
register struct inode *ip;
register struct ufsmount *ump = VFSTOUFS(mp);
register struct fs *fs;
struct timeval tv;
int error, allerror = 0;
fs = ump->um_fs;
/*
* Write back modified superblock.
* Consistency check that the superblock
* is still in the buffer cache.
*/
if (fs->fs_fmod != 0) {
if (fs->fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->fs_fsmnt);
panic("update: rofs mod");
}
fs->fs_fmod = 0;
fs->fs_time = time.tv_sec;
allerror = ffs_sbupdate(ump, waitfor);
}
/*
* Write back each (modified) inode.
*/
loop:
for (vp = mp->mnt_vnodelist.lh_first; 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;
nvp = vp->v_mntvnodes.le_next;
if (VOP_ISLOCKED(vp))
continue;
ip = VTOI(vp);
if ((((ip->i_flag &
(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0)) &&
vp->v_dirtyblkhd.lh_first == NULL)
continue;
if (vp->v_type != VCHR) {
if (vget(vp, 1))
goto loop;
error = VOP_FSYNC(vp, cred, waitfor, p);
if (error)
allerror = error;
vput(vp);
} else {
tv = time;
/* VOP_UPDATE(vp, &tv, &tv, waitfor == MNT_WAIT); */
VOP_UPDATE(vp, &tv, &tv, 0);
}
}
/*
* Force stale file system control information to be flushed.
*/
error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p);
if (error)
allerror = error;
#ifdef QUOTA
qsync(mp);
#endif
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;
int
ffs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
register struct fs *fs;
register struct inode *ip;
struct ufsmount *ump;
struct buf *bp;
struct vnode *vp;
dev_t dev;
int type, error;
ump = VFSTOUFS(mp);
dev = ump->um_dev;
restart:
if ((*vpp = ufs_ihashget(dev, ino)) != 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!
*/
if (ffs_inode_hash_lock) {
while (ffs_inode_hash_lock) {
ffs_inode_hash_lock = -1;
tsleep(&ffs_inode_hash_lock, PVM, "ffsvgt", 0);
}
goto restart;
}
ffs_inode_hash_lock = 1;
/*
* 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).
*/
type = ump->um_devvp->v_tag == VT_MFS ? M_MFSNODE : M_FFSNODE; /* XXX */
MALLOC(ip, struct inode *, sizeof(struct inode), type, M_WAITOK);
/* Allocate a new vnode/inode. */
error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp);
if (error) {
if (ffs_inode_hash_lock < 0)
wakeup(&ffs_inode_hash_lock);
ffs_inode_hash_lock = 0;
*vpp = NULL;
FREE(ip, type);
return (error);
}
bzero((caddr_t)ip, sizeof(struct inode));
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);
if (ffs_inode_hash_lock < 0)
wakeup(&ffs_inode_hash_lock);
ffs_inode_hash_lock = 0;
/* 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));
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) {
if (++nextgennumber < (u_long)time.tv_sec)
nextgennumber = time.tv_sec;
ip->i_gen = nextgennumber;
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, nam, vpp, exflagsp, credanonp)
register struct mount *mp;
struct fid *fhp;
struct mbuf *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **credanonp;
{
register 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_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
ffs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
register struct inode *ip;
register 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);
}
/*
* Write a superblock and associated information back to disk.
*/
static int
ffs_sbupdate(mp, waitfor)
struct ufsmount *mp;
int waitfor;
{
register struct fs *fs = mp->um_fs;
register struct buf *bp;
int blks;
caddr_t space;
int i, size, error = 0;
bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize, 0, 0);
bcopy((caddr_t)fs, bp->b_data, (u_int)fs->fs_sbsize);
/* Restore compatibility to old file systems. XXX */
if (fs->fs_postblformat == FS_42POSTBLFMT) /* XXX */
((struct fs *)bp->b_data)->fs_nrpos = -1; /* XXX */
if (waitfor == MNT_WAIT)
error = bwrite(bp);
else
bawrite(bp);
blks = howmany(fs->fs_cssize, fs->fs_fsize);
space = (caddr_t)fs->fs_csp[0];
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 += size;
if (waitfor == MNT_WAIT)
error = bwrite(bp);
else
bawrite(bp);
}
return (error);
}
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