NetBSD-5.0.2/sys/ufs/lfs/lfs_rfw.c
/* $NetBSD: lfs_rfw.c,v 1.11 2008/05/16 09:22:00 hannken Exp $ */
/*-
* Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Konrad E. Schroder <perseant@hhhh.org>.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lfs_rfw.c,v 1.11 2008/05/16 09:22:00 hannken Exp $");
#if defined(_KERNEL_OPT)
#include "opt_quota.h"
#endif
#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/kthread.h>
#include <sys/buf.h>
#include <sys/device.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 <sys/pool.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <uvm/uvm_extern.h>
#include <sys/sysctl.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <miscfs/specfs/specdev.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <uvm/uvm.h>
#include <uvm/uvm_stat.h>
#include <uvm/uvm_pager.h>
#include <uvm/uvm_pdaemon.h>
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/genfs/genfs_node.h>
/*
* Roll-forward code.
*/
static daddr_t check_segsum(struct lfs *, daddr_t, u_int64_t,
kauth_cred_t, int, int *, struct lwp *);
extern int lfs_do_rfw;
/*
* Allocate a particular inode with a particular version number, freeing
* any previous versions of this inode that may have gone before.
* Used by the roll-forward code.
*
* XXX this function does not have appropriate locking to be used on a live fs;
* XXX but something similar could probably be used for an "undelete" call.
*
* Called with the Ifile inode locked.
*/
int
lfs_rf_valloc(struct lfs *fs, ino_t ino, int vers, struct lwp *l,
struct vnode **vpp)
{
IFILE *ifp;
struct buf *bp, *cbp;
struct vnode *vp;
struct inode *ip;
ino_t tino, oldnext;
int error;
CLEANERINFO *cip;
ASSERT_SEGLOCK(fs); /* XXX it doesn't, really */
/*
* First, just try a vget. If the version number is the one we want,
* we don't have to do anything else. If the version number is wrong,
* take appropriate action.
*/
error = VFS_VGET(fs->lfs_ivnode->v_mount, ino, &vp);
if (error == 0) {
DLOG((DLOG_RF, "lfs_rf_valloc[1]: ino %d vp %p\n", ino, vp));
*vpp = vp;
ip = VTOI(vp);
if (ip->i_gen == vers)
return 0;
else if (ip->i_gen < vers) {
lfs_truncate(vp, (off_t)0, 0, NOCRED);
ip->i_gen = ip->i_ffs1_gen = vers;
LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE);
return 0;
} else {
DLOG((DLOG_RF, "ino %d: sought version %d, got %d\n",
ino, vers, ip->i_ffs1_gen));
vput(vp);
*vpp = NULLVP;
return EEXIST;
}
}
/*
* The inode is not in use. Find it on the free list.
*/
/* If the Ifile is too short to contain this inum, extend it */
while (VTOI(fs->lfs_ivnode)->i_size <= (ino /
fs->lfs_ifpb + fs->lfs_cleansz + fs->lfs_segtabsz)
<< fs->lfs_bshift) {
lfs_extend_ifile(fs, NOCRED);
}
LFS_IENTRY(ifp, fs, ino, bp);
oldnext = ifp->if_nextfree;
ifp->if_version = vers;
brelse(bp, 0);
LFS_GET_HEADFREE(fs, cip, cbp, &ino);
if (ino) {
LFS_PUT_HEADFREE(fs, cip, cbp, oldnext);
} else {
tino = ino;
while (1) {
LFS_IENTRY(ifp, fs, tino, bp);
if (ifp->if_nextfree == ino ||
ifp->if_nextfree == LFS_UNUSED_INUM)
break;
tino = ifp->if_nextfree;
brelse(bp, 0);
}
if (ifp->if_nextfree == LFS_UNUSED_INUM) {
brelse(bp, 0);
return ENOENT;
}
ifp->if_nextfree = oldnext;
LFS_BWRITE_LOG(bp);
}
error = lfs_ialloc(fs, fs->lfs_ivnode, ino, vers, &vp);
if (error == 0) {
/*
* Make it VREG so we can put blocks on it. We will change
* this later if it turns out to be some other kind of file.
*/
ip = VTOI(vp);
ip->i_mode = ip->i_ffs1_mode = IFREG;
ip->i_nlink = ip->i_ffs1_nlink = 1;
ip->i_ffs_effnlink = 1;
ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, &vp);
ip = VTOI(vp);
DLOG((DLOG_RF, "lfs_rf_valloc: ino %d vp %p\n", ino, vp));
/* The dirop-nature of this vnode is past */
lfs_unmark_vnode(vp);
(void)lfs_vunref(vp);
vp->v_uflag &= ~VU_DIROP;
mutex_enter(&lfs_lock);
--lfs_dirvcount;
--fs->lfs_dirvcount;
TAILQ_REMOVE(&fs->lfs_dchainhd, ip, i_lfs_dchain);
wakeup(&lfs_dirvcount);
wakeup(&fs->lfs_dirvcount);
mutex_exit(&lfs_lock);
}
*vpp = vp;
return error;
}
/*
* Load the appropriate indirect block, and change the appropriate pointer.
* Mark the block dirty. Do segment and avail accounting.
*/
static int
update_meta(struct lfs *fs, ino_t ino, int vers, daddr_t lbn,
daddr_t ndaddr, size_t size, struct lwp *l)
{
int error;
struct vnode *vp;
struct inode *ip;
#ifdef DEBUG
daddr_t odaddr;
struct indir a[NIADDR];
int num;
int i;
#endif /* DEBUG */
struct buf *bp;
SEGUSE *sup;
KASSERT(lbn >= 0); /* no indirect blocks */
if ((error = lfs_rf_valloc(fs, ino, vers, l, &vp)) != 0) {
DLOG((DLOG_RF, "update_meta: ino %d: lfs_rf_valloc"
" returned %d\n", ino, error));
return error;
}
if ((error = lfs_balloc(vp, (lbn << fs->lfs_bshift), size,
NOCRED, 0, &bp)) != 0) {
vput(vp);
return (error);
}
/* No need to write, the block is already on disk */
if (bp->b_oflags & BO_DELWRI) {
LFS_UNLOCK_BUF(bp);
fs->lfs_avail += btofsb(fs, bp->b_bcount);
}
brelse(bp, BC_INVAL);
/*
* Extend the file, if it is not large enough already.
* XXX this is not exactly right, we don't know how much of the
* XXX last block is actually used. We hope that an inode will
* XXX appear later to give the correct size.
*/
ip = VTOI(vp);
if (ip->i_size <= (lbn << fs->lfs_bshift)) {
u_int64_t newsize;
if (lbn < NDADDR)
newsize = ip->i_ffs1_size = (lbn << fs->lfs_bshift) +
(size - fs->lfs_fsize) + 1;
else
newsize = ip->i_ffs1_size = (lbn << fs->lfs_bshift) + 1;
if (ip->i_size < newsize) {
ip->i_size = newsize;
/*
* tell vm our new size for the case the inode won't
* appear later.
*/
uvm_vnp_setsize(vp, newsize);
}
}
lfs_update_single(fs, NULL, vp, lbn, ndaddr, size);
LFS_SEGENTRY(sup, fs, dtosn(fs, ndaddr), bp);
sup->su_nbytes += size;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, ndaddr), bp);
/* differences here should be due to UNWRITTEN indirect blocks. */
KASSERT((lblkno(fs, ip->i_size) > NDADDR &&
ip->i_lfs_effnblks == ip->i_ffs1_blocks) ||
ip->i_lfs_effnblks >= ip->i_ffs1_blocks);
#ifdef DEBUG
/* Now look again to make sure it worked */
ufs_bmaparray(vp, lbn, &odaddr, &a[0], &num, NULL, NULL);
for (i = num; i > 0; i--) {
if (!a[i].in_exists)
panic("update_meta: absent %d lv indirect block", i);
}
if (dbtofsb(fs, odaddr) != ndaddr)
DLOG((DLOG_RF, "update_meta: failed setting ino %d lbn %"
PRId64 " to %" PRId64 "\n", ino, lbn, ndaddr));
#endif /* DEBUG */
vput(vp);
return 0;
}
static int
update_inoblk(struct lfs *fs, daddr_t offset, kauth_cred_t cred,
struct lwp *l)
{
struct vnode *devvp, *vp;
struct inode *ip;
struct ufs1_dinode *dip;
struct buf *dbp, *ibp;
int error;
daddr_t daddr;
IFILE *ifp;
SEGUSE *sup;
devvp = VTOI(fs->lfs_ivnode)->i_devvp;
/*
* Get the inode, update times and perms.
* DO NOT update disk blocks, we do that separately.
*/
error = bread(devvp, fsbtodb(fs, offset), fs->lfs_ibsize,
cred, 0, &dbp);
if (error) {
DLOG((DLOG_RF, "update_inoblk: bread returned %d\n", error));
return error;
}
dip = ((struct ufs1_dinode *)(dbp->b_data)) + INOPB(fs);
while (--dip >= (struct ufs1_dinode *)dbp->b_data) {
if (dip->di_inumber > LFS_IFILE_INUM) {
error = lfs_rf_valloc(fs, dip->di_inumber, dip->di_gen,
l, &vp);
if (error) {
DLOG((DLOG_RF, "update_inoblk: lfs_rf_valloc"
" returned %d\n", error));
continue;
}
ip = VTOI(vp);
if (dip->di_size != ip->i_size)
lfs_truncate(vp, dip->di_size, 0, NOCRED);
/* Get mode, link count, size, and times */
memcpy(ip->i_din.ffs1_din, dip,
offsetof(struct ufs1_dinode, di_db[0]));
/* Then the rest, except di_blocks */
ip->i_flags = ip->i_ffs1_flags = dip->di_flags;
ip->i_gen = ip->i_ffs1_gen = dip->di_gen;
ip->i_uid = ip->i_ffs1_uid = dip->di_uid;
ip->i_gid = ip->i_ffs1_gid = dip->di_gid;
ip->i_mode = ip->i_ffs1_mode;
ip->i_nlink = ip->i_ffs_effnlink = ip->i_ffs1_nlink;
ip->i_size = ip->i_ffs1_size;
LFS_SET_UINO(ip, IN_CHANGE | IN_UPDATE);
/* Re-initialize to get type right */
ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p,
&vp);
vput(vp);
/* Record change in location */
LFS_IENTRY(ifp, fs, dip->di_inumber, ibp);
daddr = ifp->if_daddr;
ifp->if_daddr = dbtofsb(fs, dbp->b_blkno);
error = LFS_BWRITE_LOG(ibp); /* Ifile */
/* And do segment accounting */
if (dtosn(fs, daddr) != dtosn(fs, dbtofsb(fs, dbp->b_blkno))) {
if (daddr > 0) {
LFS_SEGENTRY(sup, fs, dtosn(fs, daddr),
ibp);
sup->su_nbytes -= sizeof (struct ufs1_dinode);
LFS_WRITESEGENTRY(sup, fs,
dtosn(fs, daddr),
ibp);
}
LFS_SEGENTRY(sup, fs, dtosn(fs, dbtofsb(fs, dbp->b_blkno)),
ibp);
sup->su_nbytes += sizeof (struct ufs1_dinode);
LFS_WRITESEGENTRY(sup, fs,
dtosn(fs, dbtofsb(fs, dbp->b_blkno)),
ibp);
}
}
}
brelse(dbp, BC_AGE);
return 0;
}
#define CHECK_CKSUM 0x0001 /* Check the checksum to make sure it's valid */
#define CHECK_UPDATE 0x0002 /* Update Ifile for new data blocks / inodes */
static daddr_t
check_segsum(struct lfs *fs, daddr_t offset, u_int64_t nextserial,
kauth_cred_t cred, int flags, int *pseg_flags, struct lwp *l)
{
struct vnode *devvp;
struct buf *bp, *dbp;
int error, nblocks = 0, ninos, i, j; /* XXX: gcc */
SEGSUM *ssp;
u_long *dp = NULL, *datap = NULL; /* XXX u_int32_t */
daddr_t oldoffset;
int32_t *iaddr; /* XXX ondisk32 */
FINFO *fip;
SEGUSE *sup;
size_t size;
devvp = VTOI(fs->lfs_ivnode)->i_devvp;
/*
* If the segment has a superblock and we're at the top
* of the segment, skip the superblock.
*/
if (sntod(fs, dtosn(fs, offset)) == offset) {
LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp);
if (sup->su_flags & SEGUSE_SUPERBLOCK)
offset += btofsb(fs, LFS_SBPAD);
brelse(bp, 0);
}
/* Read in the segment summary */
error = bread(devvp, fsbtodb(fs, offset), fs->lfs_sumsize,
cred, 0, &bp);
if (error)
return -1;
/* Check summary checksum */
ssp = (SEGSUM *)bp->b_data;
if (flags & CHECK_CKSUM) {
if (ssp->ss_sumsum != cksum(&ssp->ss_datasum,
fs->lfs_sumsize -
sizeof(ssp->ss_sumsum))) {
DLOG((DLOG_RF, "Sumsum error at 0x%" PRIx64 "\n", offset));
offset = -1;
goto err1;
}
if (ssp->ss_nfinfo == 0 && ssp->ss_ninos == 0) {
DLOG((DLOG_RF, "Empty pseg at 0x%" PRIx64 "\n", offset));
offset = -1;
goto err1;
}
if (ssp->ss_create < fs->lfs_tstamp) {
DLOG((DLOG_RF, "Old data at 0x%" PRIx64 "\n", offset));
offset = -1;
goto err1;
}
}
if (fs->lfs_version > 1) {
if (ssp->ss_serial != nextserial) {
DLOG((DLOG_RF, "Unexpected serial number at 0x%" PRIx64
"\n", offset));
offset = -1;
goto err1;
}
if (ssp->ss_ident != fs->lfs_ident) {
DLOG((DLOG_RF, "Incorrect fsid (0x%x vs 0x%x) at 0x%"
PRIx64 "\n", ssp->ss_ident, fs->lfs_ident, offset));
offset = -1;
goto err1;
}
}
if (pseg_flags)
*pseg_flags = ssp->ss_flags;
oldoffset = offset;
offset += btofsb(fs, fs->lfs_sumsize);
ninos = howmany(ssp->ss_ninos, INOPB(fs));
/* XXX ondisk32 */
iaddr = (int32_t *)((char*)bp->b_data + fs->lfs_sumsize - sizeof(int32_t));
if (flags & CHECK_CKSUM) {
/* Count blocks */
nblocks = 0;
fip = (FINFO *)((char*)bp->b_data + SEGSUM_SIZE(fs));
for (i = 0; i < ssp->ss_nfinfo; ++i) {
nblocks += fip->fi_nblocks;
if (fip->fi_nblocks <= 0)
break;
/* XXX ondisk32 */
fip = (FINFO *)(((char *)fip) + FINFOSIZE +
(fip->fi_nblocks * sizeof(int32_t)));
}
nblocks += ninos;
/* Create the sum array */
datap = dp = (u_long *)malloc(nblocks * sizeof(u_long),
M_SEGMENT, M_WAITOK);
}
/* Handle individual blocks */
fip = (FINFO *)((char*)bp->b_data + SEGSUM_SIZE(fs));
for (i = 0; i < ssp->ss_nfinfo || ninos; ++i) {
/* Inode block? */
if (ninos && *iaddr == offset) {
if (flags & CHECK_CKSUM) {
/* Read in the head and add to the buffer */
error = bread(devvp, fsbtodb(fs, offset), fs->lfs_bsize,
cred, 0, &dbp);
if (error) {
offset = -1;
goto err2;
}
(*dp++) = ((u_long *)(dbp->b_data))[0];
brelse(dbp, BC_AGE);
}
if (flags & CHECK_UPDATE) {
if ((error = update_inoblk(fs, offset, cred, l))
!= 0) {
offset = -1;
goto err2;
}
}
offset += btofsb(fs, fs->lfs_ibsize);
--iaddr;
--ninos;
--i; /* compensate */
continue;
}
size = fs->lfs_bsize;
for (j = 0; j < fip->fi_nblocks; ++j) {
if (j == fip->fi_nblocks - 1)
size = fip->fi_lastlength;
if (flags & CHECK_CKSUM) {
error = bread(devvp, fsbtodb(fs, offset), size,
cred, 0, &dbp);
if (error) {
offset = -1;
goto err2;
}
(*dp++) = ((u_long *)(dbp->b_data))[0];
brelse(dbp, BC_AGE);
}
/* Account for and update any direct blocks */
if ((flags & CHECK_UPDATE) &&
fip->fi_ino > LFS_IFILE_INUM &&
fip->fi_blocks[j] >= 0) {
update_meta(fs, fip->fi_ino, fip->fi_version,
fip->fi_blocks[j], offset, size, l);
}
offset += btofsb(fs, size);
}
/* XXX ondisk32 */
fip = (FINFO *)(((char *)fip) + FINFOSIZE
+ fip->fi_nblocks * sizeof(int32_t));
}
/* Checksum the array, compare */
if ((flags & CHECK_CKSUM) &&
ssp->ss_datasum != cksum(datap, nblocks * sizeof(u_long)))
{
DLOG((DLOG_RF, "Datasum error at 0x%" PRIx64
" (wanted %x got %x)\n",
offset, ssp->ss_datasum, cksum(datap, nblocks *
sizeof(u_long))));
offset = -1;
goto err2;
}
/* If we're at the end of the segment, move to the next */
if (dtosn(fs, offset + btofsb(fs, fs->lfs_sumsize + fs->lfs_bsize)) !=
dtosn(fs, offset)) {
if (dtosn(fs, offset) == dtosn(fs, ssp->ss_next)) {
offset = -1;
goto err2;
}
offset = ssp->ss_next;
DLOG((DLOG_RF, "LFS roll forward: moving to offset 0x%" PRIx64
" -> segment %d\n", offset, dtosn(fs,offset)));
}
if (flags & CHECK_UPDATE) {
fs->lfs_avail -= (offset - oldoffset);
/* Don't clog the buffer queue */
mutex_enter(&lfs_lock);
if (locked_queue_count > LFS_MAX_BUFS ||
locked_queue_bytes > LFS_MAX_BYTES) {
lfs_flush(fs, SEGM_CKP, 0);
}
mutex_exit(&lfs_lock);
}
err2:
if (flags & CHECK_CKSUM)
free(datap, M_SEGMENT);
err1:
brelse(bp, BC_AGE);
/* XXX should we update the serial number even for bad psegs? */
if ((flags & CHECK_UPDATE) && offset > 0 && fs->lfs_version > 1)
fs->lfs_serial = nextserial;
return offset;
}
void
lfs_roll_forward(struct lfs *fs, struct mount *mp, struct lwp *l)
{
int flags, dirty;
daddr_t offset, oldoffset, lastgoodpseg;
int sn, curseg, do_rollforward;
struct proc *p;
kauth_cred_t cred;
SEGUSE *sup;
struct buf *bp;
p = l ? l->l_proc : NULL;
cred = p ? p->p_cred : NOCRED;
/*
* Roll forward.
*
* We don't roll forward for v1 filesystems, because
* of the danger that the clock was turned back between the last
* checkpoint and crash. This would roll forward garbage.
*
* v2 filesystems don't have this problem because they use a
* monotonically increasing serial number instead of a timestamp.
*/
do_rollforward = (!(fs->lfs_pflags & LFS_PF_CLEAN) &&
lfs_do_rfw && fs->lfs_version > 1 && p != NULL);
if (do_rollforward) {
u_int64_t nextserial;
/*
* Phase I: Find the address of the last good partial
* segment that was written after the checkpoint. Mark
* the segments in question dirty, so they won't be
* reallocated.
*/
lastgoodpseg = oldoffset = offset = fs->lfs_offset;
flags = 0x0;
DLOG((DLOG_RF, "LFS roll forward phase 1: start at offset 0x%"
PRIx64 "\n", offset));
LFS_SEGENTRY(sup, fs, dtosn(fs, offset), bp);
if (!(sup->su_flags & SEGUSE_DIRTY))
--fs->lfs_nclean;
sup->su_flags |= SEGUSE_DIRTY;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, offset), bp);
nextserial = fs->lfs_serial + 1;
while ((offset = check_segsum(fs, offset, nextserial,
cred, CHECK_CKSUM, &flags, l)) > 0) {
nextserial++;
if (sntod(fs, oldoffset) != sntod(fs, offset)) {
LFS_SEGENTRY(sup, fs, dtosn(fs, oldoffset),
bp);
if (!(sup->su_flags & SEGUSE_DIRTY))
--fs->lfs_nclean;
sup->su_flags |= SEGUSE_DIRTY;
LFS_WRITESEGENTRY(sup, fs, dtosn(fs, oldoffset),
bp);
}
DLOG((DLOG_RF, "LFS roll forward phase 1: offset=0x%"
PRIx64 "\n", offset));
if (flags & SS_DIROP) {
DLOG((DLOG_RF, "lfs_mountfs: dirops at 0x%"
PRIx64 "\n", oldoffset));
if (!(flags & SS_CONT)) {
DLOG((DLOG_RF, "lfs_mountfs: dirops end "
"at 0x%" PRIx64 "\n", oldoffset));
}
}
if (!(flags & SS_CONT))
lastgoodpseg = offset;
oldoffset = offset;
}
if (flags & SS_CONT) {
DLOG((DLOG_RF, "LFS roll forward: warning: incomplete "
"dirops discarded\n"));
}
DLOG((DLOG_RF, "LFS roll forward phase 1: completed: "
"lastgoodpseg=0x%" PRIx64 "\n", lastgoodpseg));
oldoffset = fs->lfs_offset;
if (fs->lfs_offset != lastgoodpseg) {
/* Don't overwrite what we're trying to preserve */
offset = fs->lfs_offset;
fs->lfs_offset = lastgoodpseg;
fs->lfs_curseg = sntod(fs, dtosn(fs, fs->lfs_offset));
for (sn = curseg = dtosn(fs, fs->lfs_curseg);;) {
sn = (sn + 1) % fs->lfs_nseg;
if (sn == curseg)
panic("lfs_mountfs: no clean segments");
LFS_SEGENTRY(sup, fs, sn, bp);
dirty = (sup->su_flags & SEGUSE_DIRTY);
brelse(bp, 0);
if (!dirty)
break;
}
fs->lfs_nextseg = sntod(fs, sn);
/*
* Phase II: Roll forward from the first superblock.
*/
while (offset != lastgoodpseg) {
DLOG((DLOG_RF, "LFS roll forward phase 2: 0x%"
PRIx64 "\n", offset));
offset = check_segsum(fs, offset,
fs->lfs_serial + 1, cred, CHECK_UPDATE,
NULL, l);
}
/*
* Finish: flush our changes to disk.
*/
lfs_segwrite(mp, SEGM_CKP | SEGM_SYNC);
DLOG((DLOG_RF, "lfs_mountfs: roll forward ",
"recovered %lld blocks\n",
(long long)(lastgoodpseg - oldoffset)));
}
DLOG((DLOG_RF, "LFS roll forward complete\n"));
}
}