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NetBSD/sys/ufs/lfs/lfs_rfw.c
perseant 437e855235 Changes to help the roll-forward agent, to wit: 
* Mark being-deleted files in the Ifile so we can finish deleting them
  at fs mount time.
* Flag the Ifile with "cleaner must clean" when writers are waiting for
  the cleaner, rather than relying solely on the cleaner's estimation of
  whether it should clean or not.
* Note partial segments written by a user agent (in particular,
  fsck_lfs) so that repeated rolls forward don't interfere with one
  another.
* Add a new fcntl, LFCNPASS, that allows the log to wrap exactly once,
  for better testing of the validity of checkpoints.
* Keep track of the on-disk nlink count when cleaning, so that we don't
  partially complete directory operations while cleaning.
* Ensure that every single Ifile inode write represents a consistent
  view of the filesystem.  In particular, the accounting for the segment
  we are writing the inode into must be correct, and the accounting for
  the segment that inode used to reside in must be correct.  Rather than
  just rewriting the inode if we wrote it wrong, rewrite the necessary
  ifile blocks before writing the inode so we never write it wrong.
* Don't unmark any VDIROP vnodes if we haven't written them to disk,
  avoiding yet another problem with the "wait for the cleaner" error
  return from lfs_putpages().

Also, move the last callback to an aiodone call, so we no longer do any
memory management from interrupt context.
2006-09-01 19:41:28 +00:00

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/* $NetBSD: lfs_rfw.c,v 1.3 2006/09/01 19:41:28 perseant 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 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.
*/
#ifdef LFS_KERNEL_RFW
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lfs_rfw.c,v 1.3 2006/09/01 19:41:28 perseant 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, l);
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);
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);
}
if (ifp->if_nextfree == LFS_UNUSED_INUM) {
brelse(bp);
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_flag &= ~VDIROP;
simple_lock(&fs->lfs_interlock);
simple_lock(&lfs_subsys_lock);
--lfs_dirvcount;
simple_unlock(&lfs_subsys_lock);
--fs->lfs_dirvcount;
TAILQ_REMOVE(&fs->lfs_dchainhd, ip, i_lfs_dchain);
wakeup(&lfs_dirvcount);
wakeup(&fs->lfs_dirvcount);
simple_unlock(&fs->lfs_interlock);
}
*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_flags & B_DELWRI) {
LFS_UNLOCK_BUF(bp);
fs->lfs_avail += btofsb(fs, bp->b_bcount);
}
bp->b_flags |= B_INVAL;
brelse(bp);
/*
* 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, &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, l);
/* 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);
}
}
}
dbp->b_flags |= B_AGE;
brelse(dbp);
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);
}
/* Read in the segment summary */
error = bread(devvp, fsbtodb(fs, offset), fs->lfs_sumsize, cred, &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 *)(bp->b_data + fs->lfs_sumsize - sizeof(int32_t));
if (flags & CHECK_CKSUM) {
/* Count blocks */
nblocks = 0;
fip = (FINFO *)(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 *)(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, &dbp);
if (error) {
offset = -1;
goto err2;
}
(*dp++) = ((u_long *)(dbp->b_data))[0];
dbp->b_flags |= B_AGE;
brelse(dbp);
}
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, &dbp);
if (error) {
offset = -1;
goto err2;
}
(*dp++) = ((u_long *)(dbp->b_data))[0];
dbp->b_flags |= B_AGE;
brelse(dbp);
}
/* 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 */
simple_lock(&lfs_subsys_lock);
if (locked_queue_count > LFS_MAX_BUFS ||
locked_queue_bytes > LFS_MAX_BYTES) {
lfs_flush(fs, SEGM_CKP, 0);
}
simple_unlock(&lfs_subsys_lock);
}
err2:
if (flags & CHECK_CKSUM)
free(datap, M_SEGMENT);
err1:
bp->b_flags |= B_AGE;
brelse(bp);
/* 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);
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"));
}
}
#endif /* LFS_KERNEL_RFW */
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