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NetBSD/sbin/fsck_lfs/lfs.c

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/* $NetBSD: lfs.c,v 1.25 2006/09/01 19:52:48 perseant Exp $ */
/*-
* Copyright (c) 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.
*/
/*
* Copyright (c) 1989, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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. 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.
*
* @(#)ufs_bmap.c 8.8 (Berkeley) 8/11/95
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#define vnode uvnode
#include <ufs/lfs/lfs.h>
#undef vnode
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bufcache.h"
#include "vnode.h"
#include "lfs_user.h"
#include "segwrite.h"
#define panic call_panic
extern u_int32_t cksum(void *, size_t);
extern u_int32_t lfs_sb_cksum(struct dlfs *);
extern void pwarn(const char *, ...);
extern struct uvnodelst vnodelist;
extern struct uvnodelst getvnodelist[VNODE_HASH_MAX];
extern int nvnodes;
static int
lfs_fragextend(struct uvnode *, int, int, daddr_t, struct ubuf **);
int fsdirty = 0;
void (*panic_func)(int, const char *, va_list) = my_vpanic;
/*
* LFS buffer and uvnode operations
*/
int
lfs_vop_strategy(struct ubuf * bp)
{
int count;
if (bp->b_flags & B_READ) {
count = pread(bp->b_vp->v_fd, bp->b_data, bp->b_bcount,
dbtob(bp->b_blkno));
if (count == bp->b_bcount)
bp->b_flags |= B_DONE;
} else {
count = pwrite(bp->b_vp->v_fd, bp->b_data, bp->b_bcount,
dbtob(bp->b_blkno));
if (count == 0) {
perror("pwrite");
return -1;
}
bp->b_flags &= ~B_DELWRI;
reassignbuf(bp, bp->b_vp);
}
return 0;
}
int
lfs_vop_bwrite(struct ubuf * bp)
{
struct lfs *fs;
fs = bp->b_vp->v_fs;
if (!(bp->b_flags & B_DELWRI)) {
fs->lfs_avail -= btofsb(fs, bp->b_bcount);
}
bp->b_flags |= B_DELWRI | B_LOCKED;
reassignbuf(bp, bp->b_vp);
brelse(bp);
return 0;
}
/*
* ufs_bmaparray does the bmap conversion, and if requested returns the
* array of logical blocks which must be traversed to get to a block.
* Each entry contains the offset into that block that gets you to the
* next block and the disk address of the block (if it is assigned).
*/
int
ufs_bmaparray(struct lfs * fs, struct uvnode * vp, daddr_t bn, daddr_t * bnp, struct indir * ap, int *nump)
{
struct inode *ip;
struct ubuf *bp;
struct indir a[NIADDR + 1], *xap;
daddr_t daddr;
daddr_t metalbn;
int error, num;
ip = VTOI(vp);
if (bn >= 0 && bn < NDADDR) {
if (nump != NULL)
*nump = 0;
*bnp = fsbtodb(fs, ip->i_ffs1_db[bn]);
if (*bnp == 0)
*bnp = -1;
return (0);
}
xap = ap == NULL ? a : ap;
if (!nump)
nump = &num;
if ((error = ufs_getlbns(fs, vp, bn, xap, nump)) != 0)
return (error);
num = *nump;
/* Get disk address out of indirect block array */
daddr = ip->i_ffs1_ib[xap->in_off];
for (bp = NULL, ++xap; --num; ++xap) {
/* Exit the loop if there is no disk address assigned yet and
* the indirect block isn't in the cache, or if we were
* looking for an indirect block and we've found it. */
metalbn = xap->in_lbn;
if ((daddr == 0 && !incore(vp, metalbn)) || metalbn == bn)
break;
/*
* If we get here, we've either got the block in the cache
* or we have a disk address for it, go fetch it.
*/
if (bp)
brelse(bp);
xap->in_exists = 1;
bp = getblk(vp, metalbn, fs->lfs_bsize);
if (!(bp->b_flags & (B_DONE | B_DELWRI))) {
bp->b_blkno = fsbtodb(fs, daddr);
bp->b_flags |= B_READ;
VOP_STRATEGY(bp);
}
daddr = ((ufs_daddr_t *) bp->b_data)[xap->in_off];
}
if (bp)
brelse(bp);
daddr = fsbtodb(fs, (ufs_daddr_t) daddr);
*bnp = daddr == 0 ? -1 : daddr;
return (0);
}
/*
* Create an array of logical block number/offset pairs which represent the
* path of indirect blocks required to access a data block. The first "pair"
* contains the logical block number of the appropriate single, double or
* triple indirect block and the offset into the inode indirect block array.
* Note, the logical block number of the inode single/double/triple indirect
* block appears twice in the array, once with the offset into the i_ffs1_ib and
* once with the offset into the page itself.
*/
int
ufs_getlbns(struct lfs * fs, struct uvnode * vp, daddr_t bn, struct indir * ap, int *nump)
{
daddr_t metalbn, realbn;
int64_t blockcnt;
int lbc;
int i, numlevels, off;
int lognindir, indir;
metalbn = 0; /* XXXGCC -Wuninitialized [sh3] */
if (nump)
*nump = 0;
numlevels = 0;
realbn = bn;
if (bn < 0)
bn = -bn;
lognindir = -1;
for (indir = fs->lfs_nindir; indir; indir >>= 1)
++lognindir;
/* Determine the number of levels of indirection. After this loop is
* done, blockcnt indicates the number of data blocks possible at the
* given level of indirection, and NIADDR - i is the number of levels
* of indirection needed to locate the requested block. */
bn -= NDADDR;
for (lbc = 0, i = NIADDR;; i--, bn -= blockcnt) {
if (i == 0)
return (EFBIG);
lbc += lognindir;
blockcnt = (int64_t) 1 << lbc;
if (bn < blockcnt)
break;
}
/* Calculate the address of the first meta-block. */
metalbn = -((realbn >= 0 ? realbn : -realbn) - bn + NIADDR - i);
/* At each iteration, off is the offset into the bap array which is an
* array of disk addresses at the current level of indirection. The
* logical block number and the offset in that block are stored into
* the argument array. */
ap->in_lbn = metalbn;
ap->in_off = off = NIADDR - i;
ap->in_exists = 0;
ap++;
for (++numlevels; i <= NIADDR; i++) {
/* If searching for a meta-data block, quit when found. */
if (metalbn == realbn)
break;
lbc -= lognindir;
blockcnt = (int64_t) 1 << lbc;
off = (bn >> lbc) & (fs->lfs_nindir - 1);
++numlevels;
ap->in_lbn = metalbn;
ap->in_off = off;
ap->in_exists = 0;
++ap;
metalbn -= -1 + (off << lbc);
}
if (nump)
*nump = numlevels;
return (0);
}
int
lfs_vop_bmap(struct uvnode * vp, daddr_t lbn, daddr_t * daddrp)
{
return ufs_bmaparray(vp->v_fs, vp, lbn, daddrp, NULL, NULL);
}
/* Search a block for a specific dinode. */
struct ufs1_dinode *
lfs_ifind(struct lfs * fs, ino_t ino, struct ubuf * bp)
{
struct ufs1_dinode *dip = (struct ufs1_dinode *) bp->b_data;
struct ufs1_dinode *ldip, *fin;
fin = dip + INOPB(fs);
/*
* Read the inode block backwards, since later versions of the
* inode will supercede earlier ones. Though it is unlikely, it is
* possible that the same inode will appear in the same inode block.
*/
for (ldip = fin - 1; ldip >= dip; --ldip)
if (ldip->di_inumber == ino)
return (ldip);
return NULL;
}
/*
* lfs_raw_vget makes us a new vnode from the inode at the given disk address.
* XXX it currently loses atime information.
*/
struct uvnode *
lfs_raw_vget(struct lfs * fs, ino_t ino, int fd, ufs_daddr_t daddr)
{
struct uvnode *vp;
struct inode *ip;
struct ufs1_dinode *dip;
struct ubuf *bp;
int i, hash;
vp = (struct uvnode *) malloc(sizeof(*vp));
if (vp == NULL)
err(1, NULL);
memset(vp, 0, sizeof(*vp));
vp->v_fd = fd;
vp->v_fs = fs;
vp->v_usecount = 0;
vp->v_strategy_op = lfs_vop_strategy;
vp->v_bwrite_op = lfs_vop_bwrite;
vp->v_bmap_op = lfs_vop_bmap;
LIST_INIT(&vp->v_cleanblkhd);
LIST_INIT(&vp->v_dirtyblkhd);
ip = (struct inode *) malloc(sizeof(*ip));
if (ip == NULL)
err(1, NULL);
memset(ip, 0, sizeof(*ip));
ip->i_din.ffs1_din = (struct ufs1_dinode *)
malloc(sizeof(struct ufs1_dinode));
if (ip->i_din.ffs1_din == NULL)
err(1, NULL);
memset(ip->i_din.ffs1_din, 0, sizeof (struct ufs1_dinode));
/* Initialize the inode -- from lfs_vcreate. */
ip->inode_ext.lfs = malloc(sizeof(struct lfs_inode_ext));
if (ip->inode_ext.lfs == NULL)
err(1, NULL);
memset(ip->inode_ext.lfs, 0, sizeof(struct lfs_inode_ext));
vp->v_data = ip;
/* ip->i_vnode = vp; */
ip->i_number = ino;
ip->i_lockf = 0;
ip->i_diroff = 0;
ip->i_lfs_effnblks = 0;
ip->i_flag = 0;
/* Load inode block and find inode */
if (daddr > 0) {
bread(fs->lfs_devvp, fsbtodb(fs, daddr), fs->lfs_ibsize, NULL, &bp);
bp->b_flags |= B_AGE;
dip = lfs_ifind(fs, ino, bp);
if (dip == NULL) {
brelse(bp);
free(ip);
free(vp);
return NULL;
}
memcpy(ip->i_din.ffs1_din, dip, sizeof(*dip));
brelse(bp);
}
ip->i_number = ino;
/* ip->i_devvp = fs->lfs_devvp; */
ip->i_lfs = fs;
ip->i_ffs_effnlink = ip->i_ffs1_nlink;
ip->i_lfs_effnblks = ip->i_ffs1_blocks;
ip->i_lfs_osize = ip->i_ffs1_size;
#if 0
if (fs->lfs_version > 1) {
ip->i_ffs1_atime = ts.tv_sec;
ip->i_ffs1_atimensec = ts.tv_nsec;
}
#endif
memset(ip->i_lfs_fragsize, 0, NDADDR * sizeof(*ip->i_lfs_fragsize));
for (i = 0; i < NDADDR; i++)
if (ip->i_ffs1_db[i] != 0)
ip->i_lfs_fragsize[i] = blksize(fs, ip, i);
++nvnodes;
hash = ((int)(intptr_t)fs + ino) & (VNODE_HASH_MAX - 1);
LIST_INSERT_HEAD(&getvnodelist[hash], vp, v_getvnodes);
LIST_INSERT_HEAD(&vnodelist, vp, v_mntvnodes);
return vp;
}
static struct uvnode *
lfs_vget(void *vfs, ino_t ino)
{
struct lfs *fs = (struct lfs *)vfs;
ufs_daddr_t daddr;
struct ubuf *bp;
IFILE *ifp;
LFS_IENTRY(ifp, fs, ino, bp);
daddr = ifp->if_daddr;
brelse(bp);
if (daddr <= 0 || dtosn(fs, daddr) >= fs->lfs_nseg)
return NULL;
return lfs_raw_vget(fs, ino, fs->lfs_ivnode->v_fd, daddr);
}
/* Check superblock magic number and checksum */
static int
check_sb(struct lfs *fs)
{
u_int32_t checksum;
if (fs->lfs_magic != LFS_MAGIC) {
printf("Superblock magic number (0x%lx) does not match "
"expected 0x%lx\n", (unsigned long) fs->lfs_magic,
(unsigned long) LFS_MAGIC);
return 1;
}
/* checksum */
checksum = lfs_sb_cksum(&(fs->lfs_dlfs));
if (fs->lfs_cksum != checksum) {
printf("Superblock checksum (%lx) does not match computed checksum (%lx)\n",
(unsigned long) fs->lfs_cksum, (unsigned long) checksum);
return 1;
}
return 0;
}
/* Initialize LFS library; load superblocks and choose which to use. */
struct lfs *
lfs_init(int devfd, daddr_t sblkno, daddr_t idaddr, int dummy_read, int debug)
{
struct uvnode *devvp;
struct ubuf *bp;
int tryalt;
struct lfs *fs, *altfs;
int error;
vfs_init();
devvp = (struct uvnode *) malloc(sizeof(*devvp));
if (devvp == NULL)
err(1, NULL);
memset(devvp, 0, sizeof(*devvp));
devvp->v_fs = NULL;
devvp->v_fd = devfd;
devvp->v_strategy_op = raw_vop_strategy;
devvp->v_bwrite_op = raw_vop_bwrite;
devvp->v_bmap_op = raw_vop_bmap;
LIST_INIT(&devvp->v_cleanblkhd);
LIST_INIT(&devvp->v_dirtyblkhd);
tryalt = 0;
if (dummy_read) {
if (sblkno == 0)
sblkno = btodb(LFS_LABELPAD);
fs = (struct lfs *) malloc(sizeof(*fs));
if (fs == NULL)
err(1, NULL);
memset(fs, 0, sizeof(*fs));
fs->lfs_devvp = devvp;
} else {
if (sblkno == 0) {
sblkno = btodb(LFS_LABELPAD);
tryalt = 1;
} else if (debug) {
printf("No -b flag given, not attempting to verify checkpoint\n");
}
error = bread(devvp, sblkno, LFS_SBPAD, NOCRED, &bp);
fs = (struct lfs *) malloc(sizeof(*fs));
if (fs == NULL)
err(1, NULL);
memset(fs, 0, sizeof(*fs));
fs->lfs_dlfs = *((struct dlfs *) bp->b_data);
fs->lfs_devvp = devvp;
bp->b_flags |= B_INVAL;
brelse(bp);
if (tryalt) {
error = bread(devvp, fsbtodb(fs, fs->lfs_sboffs[1]),
LFS_SBPAD, NOCRED, &bp);
altfs = (struct lfs *) malloc(sizeof(*altfs));
if (altfs == NULL)
err(1, NULL);
memset(altfs, 0, sizeof(*altfs));
altfs->lfs_dlfs = *((struct dlfs *) bp->b_data);
altfs->lfs_devvp = devvp;
bp->b_flags |= B_INVAL;
brelse(bp);
if (check_sb(fs) || fs->lfs_idaddr <= 0) {
if (debug)
printf("Primary superblock is no good, using first alternate\n");
free(fs);
fs = altfs;
} else {
/* If both superblocks check out, try verification */
if (check_sb(altfs)) {
if (debug)
printf("First alternate superblock is no good, using primary\n");
free(altfs);
} else {
if (lfs_verify(fs, altfs, devvp, debug) == fs) {
free(altfs);
} else {
free(fs);
fs = altfs;
}
}
}
}
if (check_sb(fs)) {
free(fs);
return NULL;
}
}
/* Compatibility */
if (fs->lfs_version < 2) {
fs->lfs_sumsize = LFS_V1_SUMMARY_SIZE;
fs->lfs_ibsize = fs->lfs_bsize;
fs->lfs_start = fs->lfs_sboffs[0];
fs->lfs_tstamp = fs->lfs_otstamp;
fs->lfs_fsbtodb = 0;
}
if (!dummy_read) {
fs->lfs_suflags = (u_int32_t **) malloc(2 * sizeof(u_int32_t *));
if (fs->lfs_suflags == NULL)
err(1, NULL);
fs->lfs_suflags[0] = (u_int32_t *) malloc(fs->lfs_nseg * sizeof(u_int32_t));
if (fs->lfs_suflags[0] == NULL)
err(1, NULL);
fs->lfs_suflags[1] = (u_int32_t *) malloc(fs->lfs_nseg * sizeof(u_int32_t));
if (fs->lfs_suflags[1] == NULL)
err(1, NULL);
}
if (idaddr == 0)
idaddr = fs->lfs_idaddr;
else
fs->lfs_idaddr = idaddr;
/* NB: If dummy_read!=0, idaddr==0 here so we get a fake inode. */
fs->lfs_ivnode = lfs_raw_vget(fs,
(dummy_read ? LFS_IFILE_INUM : fs->lfs_ifile), devvp->v_fd,
idaddr);
if (fs->lfs_ivnode == NULL)
return NULL;
register_vget((void *)fs, lfs_vget);
return fs;
}
/*
* Check partial segment validity between fs->lfs_offset and the given goal.
*
* If goal == 0, just keep on going until the segments stop making sense,
* and return the address of the last valid partial segment.
*
* If goal != 0, return the address of the first partial segment that failed,
* or "goal" if we reached it without failure (the partial segment *at* goal
* need not be valid).
*/
ufs_daddr_t
try_verify(struct lfs *osb, struct uvnode *devvp, ufs_daddr_t goal, int debug)
{
ufs_daddr_t daddr, odaddr;
SEGSUM *sp;
int i, bc, hitclean;
struct ubuf *bp;
ufs_daddr_t nodirop_daddr;
u_int64_t serial;
bc = 0;
hitclean = 0;
odaddr = -1;
daddr = osb->lfs_offset;
nodirop_daddr = daddr;
serial = osb->lfs_serial;
while (daddr != goal) {
/*
* Don't mistakenly read a superblock, if there is one here.
*/
if (sntod(osb, dtosn(osb, daddr)) == daddr) {
if (daddr == osb->lfs_start)
daddr += btofsb(osb, LFS_LABELPAD);
for (i = 0; i < LFS_MAXNUMSB; i++) {
if (osb->lfs_sboffs[i] < daddr)
break;
if (osb->lfs_sboffs[i] == daddr)
daddr += btofsb(osb, LFS_SBPAD);
}
}
/* Read in summary block */
bread(devvp, fsbtodb(osb, daddr), osb->lfs_sumsize, NULL, &bp);
sp = (SEGSUM *)bp->b_data;
/*
* Check for a valid segment summary belonging to our fs.
*/
if (sp->ss_magic != SS_MAGIC ||
sp->ss_ident != osb->lfs_ident ||
sp->ss_serial < serial || /* XXX strengthen this */
sp->ss_sumsum != cksum(&sp->ss_datasum, osb->lfs_sumsize -
sizeof(sp->ss_sumsum))) {
brelse(bp);
if (debug) {
if (sp->ss_magic != SS_MAGIC)
pwarn("pseg at 0x%x: "
"wrong magic number\n",
(int)daddr);
else if (sp->ss_ident != osb->lfs_ident)
pwarn("pseg at 0x%x: "
"expected ident %llx, got %llx\n",
(int)daddr,
(long long)sp->ss_ident,
(long long)osb->lfs_ident);
else if (sp->ss_serial >= serial)
pwarn("pseg at 0x%x: "
"serial %d < %d\n", (int)daddr,
(int)sp->ss_serial, (int)serial);
else
pwarn("pseg at 0x%x: "
"summary checksum wrong\n",
(int)daddr);
}
break;
}
if (debug && sp->ss_serial != serial)
pwarn("warning, serial=%d ss_serial=%d\n",
(int)serial, (int)sp->ss_serial);
++serial;
bc = check_summary(osb, sp, daddr, debug, devvp, NULL);
if (bc == 0) {
brelse(bp);
break;
}
if (debug)
pwarn("summary good: 0x%x/%d\n", (int)daddr,
(int)sp->ss_serial);
assert (bc > 0);
odaddr = daddr;
daddr += btofsb(osb, osb->lfs_sumsize + bc);
if (dtosn(osb, odaddr) != dtosn(osb, daddr) ||
dtosn(osb, daddr) != dtosn(osb, daddr +
btofsb(osb, osb->lfs_sumsize + osb->lfs_bsize) - 1)) {
daddr = sp->ss_next;
}
/*
* Check for the beginning and ending of a sequence of
* dirops. Writes from the cleaner never involve new
* information, and are always checkpoints; so don't try
* to roll forward through them. Likewise, psegs written
* by a previous roll-forward attempt are not interesting.
*/
if (sp->ss_flags & (SS_CLEAN | SS_RFW))
hitclean = 1;
if (hitclean == 0 && (sp->ss_flags & SS_CONT) == 0)
nodirop_daddr = daddr;
brelse(bp);
}
if (goal == 0)
return nodirop_daddr;
else
return daddr;
}
/* Use try_verify to check whether the newer superblock is valid. */
struct lfs *
lfs_verify(struct lfs *sb0, struct lfs *sb1, struct uvnode *devvp, int debug)
{
ufs_daddr_t daddr;
struct lfs *osb, *nsb;
/*
* Verify the checkpoint of the newer superblock,
* if the timestamp/serial number of the two superblocks is
* different.
*/
osb = NULL;
if (debug)
pwarn("sb0 %lld, sb1 %lld",
(long long) sb0->lfs_serial,
(long long) sb1->lfs_serial);
if ((sb0->lfs_version == 1 &&
sb0->lfs_otstamp != sb1->lfs_otstamp) ||
(sb0->lfs_version > 1 &&
sb0->lfs_serial != sb1->lfs_serial)) {
if (sb0->lfs_version == 1) {
if (sb0->lfs_otstamp > sb1->lfs_otstamp) {
osb = sb1;
nsb = sb0;
} else {
osb = sb0;
nsb = sb1;
}
} else {
if (sb0->lfs_serial > sb1->lfs_serial) {
osb = sb1;
nsb = sb0;
} else {
osb = sb0;
nsb = sb1;
}
}
if (debug) {
printf("Attempting to verify newer checkpoint...");
fflush(stdout);
}
daddr = try_verify(osb, devvp, nsb->lfs_offset, debug);
if (debug)
printf("done.\n");
if (daddr == nsb->lfs_offset) {
pwarn("** Newer checkpoint verified, recovered %lld seconds of data\n",
(long long) nsb->lfs_tstamp - (long long) osb->lfs_tstamp);
sbdirty();
} else {
pwarn("** Newer checkpoint invalid, lost %lld seconds of data\n", (long long) nsb->lfs_tstamp - (long long) osb->lfs_tstamp);
}
return (daddr == nsb->lfs_offset ? nsb : osb);
}
/* Nothing to check */
return osb;
}
/* Verify a partial-segment summary; return the number of bytes on disk. */
int
check_summary(struct lfs *fs, SEGSUM *sp, ufs_daddr_t pseg_addr, int debug,
struct uvnode *devvp, void (func(ufs_daddr_t, FINFO *)))
{
FINFO *fp;
int bc; /* Bytes in partial segment */
int nblocks;
ufs_daddr_t seg_addr, daddr;
ufs_daddr_t *dp, *idp;
struct ubuf *bp;
int i, j, k, datac, len;
long sn;
u_int32_t *datap;
u_int32_t ccksum;
sn = dtosn(fs, pseg_addr);
seg_addr = sntod(fs, sn);
/* We've already checked the sumsum, just do the data bounds and sum */
/* Count the blocks. */
nblocks = howmany(sp->ss_ninos, INOPB(fs));
bc = nblocks << (fs->lfs_version > 1 ? fs->lfs_ffshift : fs->lfs_bshift);
assert(bc >= 0);
fp = (FINFO *) (sp + 1);
for (i = 0; i < sp->ss_nfinfo; i++) {
nblocks += fp->fi_nblocks;
bc += fp->fi_lastlength + ((fp->fi_nblocks - 1)
<< fs->lfs_bshift);
assert(bc >= 0);
fp = (FINFO *) (fp->fi_blocks + fp->fi_nblocks);
if (((char *)fp) - (char *)sp > fs->lfs_sumsize)
return 0;
}
datap = (u_int32_t *) malloc(nblocks * sizeof(*datap));
if (datap == NULL)
err(1, NULL);
datac = 0;
dp = (ufs_daddr_t *) sp;
dp += fs->lfs_sumsize / sizeof(ufs_daddr_t);
dp--;
idp = dp;
daddr = pseg_addr + btofsb(fs, fs->lfs_sumsize);
fp = (FINFO *) (sp + 1);
for (i = 0, j = 0;
i < sp->ss_nfinfo || j < howmany(sp->ss_ninos, INOPB(fs)); i++) {
if (i >= sp->ss_nfinfo && *idp != daddr) {
pwarn("Not enough inode blocks in pseg at 0x%" PRIx32
": found %d, wanted %d\n",
pseg_addr, j, howmany(sp->ss_ninos, INOPB(fs)));
if (debug)
pwarn("*idp=%x, daddr=%" PRIx32 "\n", *idp,
daddr);
break;
}
while (j < howmany(sp->ss_ninos, INOPB(fs)) && *idp == daddr) {
bread(devvp, fsbtodb(fs, daddr), fs->lfs_ibsize, NOCRED, &bp);
datap[datac++] = ((u_int32_t *) (bp->b_data))[0];
brelse(bp);
++j;
daddr += btofsb(fs, fs->lfs_ibsize);
--idp;
}
if (i < sp->ss_nfinfo) {
if (func)
func(daddr, fp);
for (k = 0; k < fp->fi_nblocks; k++) {
len = (k == fp->fi_nblocks - 1 ?
fp->fi_lastlength
: fs->lfs_bsize);
bread(devvp, fsbtodb(fs, daddr), len, NOCRED, &bp);
datap[datac++] = ((u_int32_t *) (bp->b_data))[0];
brelse(bp);
daddr += btofsb(fs, len);
}
fp = (FINFO *) (fp->fi_blocks + fp->fi_nblocks);
}
}
if (datac != nblocks) {
pwarn("Partial segment at 0x%llx expected %d blocks counted %d\n",
(long long) pseg_addr, nblocks, datac);
}
ccksum = cksum(datap, nblocks * sizeof(u_int32_t));
/* Check the data checksum */
if (ccksum != sp->ss_datasum) {
pwarn("Partial segment at 0x%" PRIx32 " data checksum"
" mismatch: given 0x%x, computed 0x%x\n",
pseg_addr, sp->ss_datasum, ccksum);
free(datap);
return 0;
}
free(datap);
assert(bc >= 0);
return bc;
}
/* print message and exit */
void
my_vpanic(int fatal, const char *fmt, va_list ap)
{
(void) vprintf(fmt, ap);
exit(8);
}
void
call_panic(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
panic_func(1, fmt, ap);
va_end(ap);
}
/* Allocate a new inode. */
struct uvnode *
lfs_valloc(struct lfs *fs, ino_t ino)
{
struct ubuf *bp, *cbp;
struct ifile *ifp;
ino_t new_ino;
int error;
int new_gen;
CLEANERINFO *cip;
/* Get the head of the freelist. */
LFS_GET_HEADFREE(fs, cip, cbp, &new_ino);
/*
* Remove the inode from the free list and write the new start
* of the free list into the superblock.
*/
LFS_IENTRY(ifp, fs, new_ino, bp);
if (ifp->if_daddr != LFS_UNUSED_DADDR)
panic("lfs_valloc: inuse inode %d on the free list", new_ino);
LFS_PUT_HEADFREE(fs, cip, cbp, ifp->if_nextfree);
new_gen = ifp->if_version; /* version was updated by vfree */
brelse(bp);
/* Extend IFILE so that the next lfs_valloc will succeed. */
if (fs->lfs_freehd == LFS_UNUSED_INUM) {
if ((error = extend_ifile(fs)) != 0) {
LFS_PUT_HEADFREE(fs, cip, cbp, new_ino);
return NULL;
}
}
/* Set superblock modified bit and increment file count. */
sbdirty();
++fs->lfs_nfiles;
return lfs_raw_vget(fs, ino, fs->lfs_devvp->v_fd, 0x0);
}
#ifdef IN_FSCK_LFS
void reset_maxino(ino_t);
#endif
/*
* Add a new block to the Ifile, to accommodate future file creations.
*/
int
extend_ifile(struct lfs *fs)
{
struct uvnode *vp;
struct inode *ip;
IFILE *ifp;
IFILE_V1 *ifp_v1;
struct ubuf *bp, *cbp;
daddr_t i, blkno, max;
ino_t oldlast;
CLEANERINFO *cip;
vp = fs->lfs_ivnode;
ip = VTOI(vp);
blkno = lblkno(fs, ip->i_ffs1_size);
lfs_balloc(vp, ip->i_ffs1_size, fs->lfs_bsize, &bp);
ip->i_ffs1_size += fs->lfs_bsize;
ip->i_flag |= IN_MODIFIED;
i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) *
fs->lfs_ifpb;
LFS_GET_HEADFREE(fs, cip, cbp, &oldlast);
LFS_PUT_HEADFREE(fs, cip, cbp, i);
max = i + fs->lfs_ifpb;
fs->lfs_bfree -= btofsb(fs, fs->lfs_bsize);
if (fs->lfs_version == 1) {
for (ifp_v1 = (IFILE_V1 *)bp->b_data; i < max; ++ifp_v1) {
ifp_v1->if_version = 1;
ifp_v1->if_daddr = LFS_UNUSED_DADDR;
ifp_v1->if_nextfree = ++i;
}
ifp_v1--;
ifp_v1->if_nextfree = oldlast;
} else {
for (ifp = (IFILE *)bp->b_data; i < max; ++ifp) {
ifp->if_version = 1;
ifp->if_daddr = LFS_UNUSED_DADDR;
ifp->if_nextfree = ++i;
}
ifp--;
ifp->if_nextfree = oldlast;
}
LFS_PUT_TAILFREE(fs, cip, cbp, max - 1);
LFS_BWRITE_LOG(bp);
#ifdef IN_FSCK_LFS
reset_maxino(((ip->i_ffs1_size >> fs->lfs_bshift) - fs->lfs_segtabsz -
fs->lfs_cleansz) * fs->lfs_ifpb);
#endif
return 0;
}
/*
* Allocate a block, and to inode and filesystem block accounting for it
* and for any indirect blocks the may need to be created in order for
* this block to be created.
*
* Blocks which have never been accounted for (i.e., which "do not exist")
* have disk address 0, which is translated by ufs_bmap to the special value
* UNASSIGNED == -1, as in the historical UFS.
*
* Blocks which have been accounted for but which have not yet been written
* to disk are given the new special disk address UNWRITTEN == -2, so that
* they can be differentiated from completely new blocks.
*/
int
lfs_balloc(struct uvnode *vp, off_t startoffset, int iosize, struct ubuf **bpp)
{
int offset;
daddr_t daddr, idaddr;
struct ubuf *ibp, *bp;
struct inode *ip;
struct lfs *fs;
struct indir indirs[NIADDR+2], *idp;
daddr_t lbn, lastblock;
int bb, bcount;
int error, frags, i, nsize, osize, num;
ip = VTOI(vp);
fs = ip->i_lfs;
offset = blkoff(fs, startoffset);
lbn = lblkno(fs, startoffset);
/*
* Three cases: it's a block beyond the end of file, it's a block in
* the file that may or may not have been assigned a disk address or
* we're writing an entire block.
*
* Note, if the daddr is UNWRITTEN, the block already exists in
* the cache (it was read or written earlier). If so, make sure
* we don't count it as a new block or zero out its contents. If
* it did not, make sure we allocate any necessary indirect
* blocks.
*
* If we are writing a block beyond the end of the file, we need to
* check if the old last block was a fragment. If it was, we need
* to rewrite it.
*/
if (bpp)
*bpp = NULL;
/* Check for block beyond end of file and fragment extension needed. */
lastblock = lblkno(fs, ip->i_ffs1_size);
if (lastblock < NDADDR && lastblock < lbn) {
osize = blksize(fs, ip, lastblock);
if (osize < fs->lfs_bsize && osize > 0) {
if ((error = lfs_fragextend(vp, osize, fs->lfs_bsize,
lastblock,
(bpp ? &bp : NULL))))
return (error);
ip->i_ffs1_size = ip->i_ffs1_size =
(lastblock + 1) * fs->lfs_bsize;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (bpp)
(void) VOP_BWRITE(bp);
}
}
/*
* If the block we are writing is a direct block, it's the last
* block in the file, and offset + iosize is less than a full
* block, we can write one or more fragments. There are two cases:
* the block is brand new and we should allocate it the correct
* size or it already exists and contains some fragments and
* may need to extend it.
*/
if (lbn < NDADDR && lblkno(fs, ip->i_ffs1_size) <= lbn) {
osize = blksize(fs, ip, lbn);
nsize = fragroundup(fs, offset + iosize);
if (lblktosize(fs, lbn) >= ip->i_ffs1_size) {
/* Brand new block or fragment */
frags = numfrags(fs, nsize);
bb = fragstofsb(fs, frags);
if (bpp) {
*bpp = bp = getblk(vp, lbn, nsize);
bp->b_blkno = UNWRITTEN;
}
ip->i_lfs_effnblks += bb;
fs->lfs_bfree -= bb;
ip->i_ffs1_db[lbn] = UNWRITTEN;
} else {
if (nsize <= osize) {
/* No need to extend */
if (bpp && (error = bread(vp, lbn, osize, NOCRED, &bp)))
return error;
} else {
/* Extend existing block */
if ((error =
lfs_fragextend(vp, osize, nsize, lbn,
(bpp ? &bp : NULL))))
return error;
}
if (bpp)
*bpp = bp;
}
return 0;
}
error = ufs_bmaparray(fs, vp, lbn, &daddr, &indirs[0], &num);
if (error)
return (error);
daddr = (daddr_t)((int32_t)daddr); /* XXX ondisk32 */
/*
* Do byte accounting all at once, so we can gracefully fail *before*
* we start assigning blocks.
*/
bb = fsbtodb(fs, 1); /* bb = VFSTOUFS(vp->v_mount)->um_seqinc; */
bcount = 0;
if (daddr == UNASSIGNED) {
bcount = bb;
}
for (i = 1; i < num; ++i) {
if (!indirs[i].in_exists) {
bcount += bb;
}
}
fs->lfs_bfree -= bcount;
ip->i_lfs_effnblks += bcount;
if (daddr == UNASSIGNED) {
if (num > 0 && ip->i_ffs1_ib[indirs[0].in_off] == 0) {
ip->i_ffs1_ib[indirs[0].in_off] = UNWRITTEN;
}
/*
* Create new indirect blocks if necessary
*/
if (num > 1) {
idaddr = ip->i_ffs1_ib[indirs[0].in_off];
for (i = 1; i < num; ++i) {
ibp = getblk(vp, indirs[i].in_lbn,
fs->lfs_bsize);
if (!indirs[i].in_exists) {
memset(ibp->b_data, 0, ibp->b_bufsize);
ibp->b_blkno = UNWRITTEN;
} else if (!(ibp->b_flags & (B_DELWRI | B_DONE))) {
ibp->b_blkno = fsbtodb(fs, idaddr);
ibp->b_flags |= B_READ;
VOP_STRATEGY(ibp);
}
/*
* This block exists, but the next one may not.
* If that is the case mark it UNWRITTEN to
* keep the accounting straight.
*/
/* XXX ondisk32 */
if (((int32_t *)ibp->b_data)[indirs[i].in_off] == 0)
((int32_t *)ibp->b_data)[indirs[i].in_off] =
UNWRITTEN;
/* XXX ondisk32 */
idaddr = ((int32_t *)ibp->b_data)[indirs[i].in_off];
if ((error = VOP_BWRITE(ibp)))
return error;
}
}
}
/*
* Get the existing block from the cache, if requested.
*/
frags = fsbtofrags(fs, bb);
if (bpp)
*bpp = bp = getblk(vp, lbn, blksize(fs, ip, lbn));
/*
* The block we are writing may be a brand new block
* in which case we need to do accounting.
*
* We can tell a truly new block because ufs_bmaparray will say
* it is UNASSIGNED. Once we allocate it we will assign it the
* disk address UNWRITTEN.
*/
if (daddr == UNASSIGNED) {
if (bpp) {
/* Note the new address */
bp->b_blkno = UNWRITTEN;
}
switch (num) {
case 0:
ip->i_ffs1_db[lbn] = UNWRITTEN;
break;
case 1:
ip->i_ffs1_ib[indirs[0].in_off] = UNWRITTEN;
break;
default:
idp = &indirs[num - 1];
if (bread(vp, idp->in_lbn, fs->lfs_bsize, NOCRED,
&ibp))
panic("lfs_balloc: bread bno %lld",
(long long)idp->in_lbn);
/* XXX ondisk32 */
((int32_t *)ibp->b_data)[idp->in_off] = UNWRITTEN;
VOP_BWRITE(ibp);
}
} else if (bpp && !(bp->b_flags & (B_DONE|B_DELWRI))) {
/*
* Not a brand new block, also not in the cache;
* read it in from disk.
*/
if (iosize == fs->lfs_bsize)
/* Optimization: I/O is unnecessary. */
bp->b_blkno = daddr;
else {
/*
* We need to read the block to preserve the
* existing bytes.
*/
bp->b_blkno = daddr;
bp->b_flags |= B_READ;
VOP_STRATEGY(bp);
return 0;
}
}
return (0);
}
int
lfs_fragextend(struct uvnode *vp, int osize, int nsize, daddr_t lbn,
struct ubuf **bpp)
{
struct inode *ip;
struct lfs *fs;
long bb;
int error;
size_t obufsize;
ip = VTOI(vp);
fs = ip->i_lfs;
bb = (long)fragstofsb(fs, numfrags(fs, nsize - osize));
error = 0;
/*
* If we are not asked to actually return the block, all we need
* to do is allocate space for it. UBC will handle dirtying the
* appropriate things and making sure it all goes to disk.
* Don't bother to read in that case.
*/
if (bpp && (error = bread(vp, lbn, osize, NOCRED, bpp))) {
brelse(*bpp);
goto out;
}
fs->lfs_bfree -= bb;
ip->i_lfs_effnblks += bb;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (bpp) {
obufsize = (*bpp)->b_bufsize;
(*bpp)->b_data = realloc((*bpp)->b_data, nsize);
bzero((char *)((*bpp)->b_data) + osize, (u_int)(nsize - osize));
}
out:
return (error);
}
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