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NetBSD/libexec/lfs_cleanerd/library.c
perseant f4fea25c9f Note each type of failure in clean_inode and provide statistics on 
failures as well as successes when a run of clean_all_inodes completes.

Explicitly cast to off_t in get_dinode and get_rawblock, to make sure we
read the right block.
2002-06-14 05:21:21 +00:00

873 lines
23 KiB
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/* $NetBSD: library.c,v 1.29 2002/06/14 05:21:21 perseant Exp $ */
/*-
* Copyright (c) 1992, 1993
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)library.c 8.3 (Berkeley) 5/24/95";
#else
__RCSID("$NetBSD: library.c,v 1.29 2002/06/14 05:21:21 perseant Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <ufs/ufs/dinode.h>
#include <ufs/lfs/lfs.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include "clean.h"
void add_blocks(FS_INFO *, BLOCK_INFO_15 *, int *, SEGSUM *, caddr_t,
daddr_t, daddr_t);
void add_inodes(FS_INFO *, BLOCK_INFO_15 *, int *, SEGSUM *, caddr_t,
daddr_t);
int bi_compare(const void *, const void *);
int bi_toss(const void *, const void *, const void *);
void get_ifile(FS_INFO *, int);
int get_superblock(FS_INFO *, struct lfs *);
int pseg_valid(FS_INFO *, SEGSUM *, daddr_t);
int pseg_size(daddr_t, FS_INFO *, SEGSUM *);
extern int debug;
extern u_long cksum(void *, size_t); /* XXX */
static int ifile_fd;
static int dev_fd;
/*
* This function will get information on a a filesystem which matches
* the name and type given. If a "name" is in a filesystem of the given
* type, then buf is filled with that filesystem's info, and the
* a non-zero value is returned.
*/
int
fs_getmntinfo(struct statfs **buf, char *name, const char *type)
{
/* allocate space for the filesystem info */
*buf = (struct statfs *)malloc(sizeof(struct statfs));
if (*buf == NULL)
return 0;
/* grab the filesystem info */
if (ifile_fd <= 0) {
if (statfs(name, *buf) < 0) {
free(*buf);
return 0;
}
} else if(fstatfs(ifile_fd, *buf) < 0) {
free(*buf);
return 0;
}
/* check to see if it's the one we want */
if (strncmp(type, (*buf)->f_fstypename, MFSNAMELEN) ||
strncmp(name, (*buf)->f_mntonname, MNAMELEN)) {
/* "this is not the filesystem you're looking for" */
free(*buf);
return 0;
}
return 1;
}
/*
* Get all the information available on an LFS file system.
* Returns an pointer to an FS_INFO structure, NULL on error.
*/
FS_INFO *
get_fs_info (struct statfs *lstatfsp, int use_mmap)
{
FS_INFO *fsp;
fsp = (FS_INFO *)malloc(sizeof(FS_INFO));
if (fsp == NULL)
return NULL;
memset(fsp, 0, sizeof(FS_INFO));
fsp->fi_statfsp = lstatfsp;
if (get_superblock (fsp, &fsp->fi_lfs)) {
syslog(LOG_ERR, "Exiting: get_fs_info: get_superblock failed: %m");
exit(1);
}
get_ifile (fsp, use_mmap);
return (fsp);
}
/*
* If we are reading the ifile then we need to refresh it. Even if
* we are mmapping it, it might have grown. Finally, we need to
* refresh the file system information (statfs) info.
*/
void
reread_fs_info(FS_INFO *fsp, int use_mmap)
{
if (ifile_fd > 0) {
if (fstatfs(ifile_fd, fsp->fi_statfsp)) {
syslog(LOG_ERR, "Exiting: reread_fs_info: fstatfs failed: %m");
exit(1);
}
} else if (statfs(fsp->fi_statfsp->f_mntonname, fsp->fi_statfsp)) {
syslog(LOG_ERR, "Exiting: reread_fs_info: statfs failed: %m");
exit(1);
}
get_ifile (fsp, use_mmap);
}
/*
* Read a block from disk.
*/
int
get_rawblock(FS_INFO *fsp, char *buf, size_t size, ufs_daddr_t daddr)
{
char rdev[MNAMELEN];
if (dev_fd <= 0) {
strcpy(rdev, "/dev/r"); /* XXX */
strcat(rdev + 6, fsp->fi_statfsp->f_mntfromname + 5);
dev_fd = open(rdev, O_RDONLY);
}
if (dev_fd < 0) {
syslog(LOG_ERR, "%s", rdev);
exit(1);
}
return pread(dev_fd, buf, size, fsbtob(&fsp->fi_lfs, (off_t)daddr));
}
/*
* Read an inode from disk.
*/
struct dinode *
get_dinode (FS_INFO *fsp, ino_t ino)
{
static struct dinode dino;
struct dinode *dip, *dib;
struct lfs *lfsp;
char rdev[MNAMELEN];
BLOCK_INFO_15 bi;
lfsp = &fsp->fi_lfs;
/*
* Locate the inode block and find the inode.
* Use this to know how large the file is.
*/
memset(&bi, 0, sizeof(bi));
bi.bi_inode = ino;
bi.bi_lbn = LFS_UNUSED_LBN; /* We want the inode */
if (lfs_bmapv(&fsp->fi_statfsp->f_fsid, &bi, 1) < 0) {
syslog(LOG_WARNING, "lfs_bmapv: %m");
return NULL;
}
if (bi.bi_daddr <= 0)
return NULL;
if (dev_fd <= 0) {
strcpy(rdev, "/dev/r"); /* XXX */
strcat(rdev + 6, fsp->fi_statfsp->f_mntfromname + 5);
dev_fd = open(rdev, O_RDONLY);
}
if (dev_fd < 0) {
syslog(LOG_ERR, "%s", rdev);
exit(1);
}
dib = (struct dinode *)malloc(lfsp->lfs_ibsize);
pread(dev_fd, dib, lfsp->lfs_ibsize, fsbtob(lfsp, (off_t)bi.bi_daddr));
for (dip = dib; dip != dib + lfsp->lfs_inopb; ++dip)
if (dip->di_u.inumber == ino)
break;
if (dip == dib + lfsp->lfs_inopb) {
free(dib);
syslog(LOG_WARNING, "dinode %d not found at fsb 0x%x", ino, bi.bi_daddr);
return NULL;
}
dino = *dip; /* structure copy */
free(dib);
return &dino;
}
/*
* Gets the superblock from disk (possibly in face of errors)
*/
int
get_superblock (FS_INFO *fsp, struct lfs *sbp)
{
char mntfromname[MNAMELEN+1];
char buf[LFS_SBPAD];
static off_t sboff = LFS_LABELPAD;
strcpy(mntfromname, "/dev/r");
strcat(mntfromname, fsp->fi_statfsp->f_mntfromname+5);
if(dev_fd <= 0) {
if ((dev_fd = open(mntfromname, O_RDONLY, (mode_t)0)) < 0) {
syslog(LOG_WARNING,"get_superblock: bad open: %m");
return (-1);
}
} else
lseek(dev_fd, 0, SEEK_SET);
do {
get(dev_fd, sboff, buf, LFS_SBPAD);
memcpy(&(sbp->lfs_dlfs), buf, sizeof(struct dlfs));
if (sboff == LFS_LABELPAD && fsbtob(sbp, 1) > LFS_LABELPAD)
sboff = fsbtob(sbp, (off_t)sbp->lfs_sboffs[0]);
else
break;
} while (1);
/* close (fid); */
/* Compatibility */
if (sbp->lfs_version < 2) {
sbp->lfs_sumsize = LFS_V1_SUMMARY_SIZE;
sbp->lfs_ibsize = sbp->lfs_bsize;
sbp->lfs_start = sbp->lfs_sboffs[0];
sbp->lfs_tstamp = sbp->lfs_otstamp;
sbp->lfs_fsbtodb = 0;
}
return (0);
}
/*
* This function will map the ifile into memory. It causes a
* fatal error on failure.
*/
void
get_ifile (FS_INFO *fsp, int use_mmap)
{
struct stat file_stat;
struct statfs statfsbuf;
caddr_t ifp;
char *ifile_name;
int count;
ifp = NULL;
ifile_name = malloc(strlen(fsp->fi_statfsp->f_mntonname) +
strlen(IFILE_NAME)+2);
strcat(strcat(strcpy(ifile_name, fsp->fi_statfsp->f_mntonname), "/"),
IFILE_NAME);
if(ifile_fd <= 0) {
/* XXX KS - Do we ever *write* to the ifile? */
if ((ifile_fd = open(ifile_name, O_RDONLY, (mode_t)0)) < 0) {
syslog(LOG_ERR, "Exiting: get_ifile: bad open: %m");
exit(1);
}
} else
lseek(ifile_fd, 0, SEEK_SET);
if (fstat (ifile_fd, &file_stat)) {
/* If the fs was unmounted, don't complain */
statfs(fsp->fi_statfsp->f_mntonname, &statfsbuf);
if(memcmp(&statfsbuf.f_fsid,&fsp->fi_statfsp->f_fsid,
sizeof(statfsbuf.f_fsid))!=0)
{
/* Filesystem still mounted, this error is real */
syslog(LOG_ERR, "Exiting: get_ifile: fstat failed: %m");
exit(1);
}
exit(0);
}
fsp->fi_fs_tstamp = file_stat.st_mtimespec.tv_sec;
if (use_mmap && file_stat.st_size == fsp->fi_ifile_length) {
/* (void) close(fid); */
free(ifile_name);
return;
}
/* get the ifile */
if (use_mmap) {
if (fsp->fi_cip)
munmap((caddr_t)fsp->fi_cip, fsp->fi_ifile_length);
/* XXX KS - Do we ever *write* to the ifile? */
ifp = mmap ((caddr_t)0, file_stat.st_size,
PROT_READ, MAP_FILE|MAP_PRIVATE, ifile_fd, (off_t)0);
if (ifp == (caddr_t)(-1)) {
syslog(LOG_ERR, "Exiting: get_ifile: mmap failed: %m");
exit(1);
}
} else {
if (fsp->fi_cip)
free(fsp->fi_cip);
if (!(ifp = malloc (file_stat.st_size))) {
syslog(LOG_ERR, "Exiting: get_ifile: malloc failed: %m");
exit(1);
}
redo_read:
count = read (ifile_fd, ifp, (size_t) file_stat.st_size);
if (count < 0) {
syslog(LOG_ERR, "Exiting: get_ifile: bad ifile read: %m");
exit(1);
}
else if (count < file_stat.st_size) {
syslog(LOG_WARNING, "get_ifile: %m");
if (lseek(ifile_fd, 0, SEEK_SET) < 0) {
syslog(LOG_ERR, "Exiting: get_ifile: bad ifile lseek: %m");
exit(1);
}
goto redo_read;
}
}
fsp->fi_ifile_length = file_stat.st_size;
/* close (fid); */
fsp->fi_cip = (CLEANERINFO *)ifp;
fsp->fi_segusep = (SEGUSE *)(ifp + CLEANSIZE(fsp));
fsp->fi_ifilep = (IFILE *)((caddr_t)fsp->fi_segusep + SEGTABSIZE(fsp));
/*
* The number of ifile entries is equal to the number of
* blocks in the ifile minus the ones allocated to cleaner info
* and segment usage table multiplied by the number of ifile
* entries per page.
*/
fsp->fi_ifile_count = ((fsp->fi_ifile_length >> fsp->fi_lfs.lfs_bshift)
- fsp->fi_lfs.lfs_cleansz - fsp->fi_lfs.lfs_segtabsz) *
fsp->fi_lfs.lfs_ifpb;
free (ifile_name);
}
/*
* Return the size of the partial segment, in bytes.
*/
int
pseg_size(daddr_t pseg_addr, FS_INFO *fsp, SEGSUM *sp)
{
int i, ssize = 0;
struct lfs *lfsp;
FINFO *fp;
lfsp = &fsp->fi_lfs;
ssize = lfsp->lfs_sumsize
+ howmany(sp->ss_ninos, INOPB(lfsp)) * lfsp->lfs_ibsize;
if (lfsp->lfs_version == 1)
fp = (FINFO *)(((char *)sp) + sizeof(SEGSUM_V1));
else
fp = (FINFO *)(sp + 1);
for (i = 0; i < sp->ss_nfinfo; ++i) {
ssize += (fp->fi_nblocks-1) * lfsp->lfs_bsize
+ fp->fi_lastlength;
fp = (FINFO *)(&fp->fi_blocks[fp->fi_nblocks]);
}
return ssize;
}
/*
* This function will scan a segment and return a list of
* <inode, blocknum> pairs which indicate which blocks were
* contained as live data within the segment when the segment
* summary was read (it may have "died" since then). Any given
* pair will be listed at most once.
*/
int
lfs_segmapv(FS_INFO *fsp, int seg, caddr_t seg_buf, BLOCK_INFO_15 **blocks, int *bcount)
{
BLOCK_INFO_15 *bip, *_bip;
SEGSUM *sp;
SEGUSE *sup;
FINFO *fip;
struct lfs *lfsp;
caddr_t s;
daddr_t pseg_addr, seg_addr;
int nelem, nblocks, nsegs, sumsize, i, ssize;
i = 0;
bip = NULL;
lfsp = &fsp->fi_lfs;
nelem = 2 * segtod(lfsp, 1);
if (!(bip = malloc(nelem * sizeof(BLOCK_INFO_15)))) {
syslog(LOG_DEBUG, "couldn't allocate %ld bytes in lfs_segmapv",
(long)(nelem * sizeof(BLOCK_INFO_15)));
goto err0;
}
sup = SEGUSE_ENTRY(lfsp, fsp->fi_segusep, seg);
s = seg_buf + (sup->su_flags & SEGUSE_SUPERBLOCK ? LFS_SBPAD : 0);
seg_addr = sntod(lfsp, seg);
pseg_addr = seg_addr + (sup->su_flags & SEGUSE_SUPERBLOCK ?
btofsb(lfsp, LFS_SBPAD) : 0);
if (seg == 0 && lfsp->lfs_version > 1) {
if (fsbtob(lfsp, pseg_addr) < LFS_LABELPAD + LFS_SBPAD) {
pseg_addr = btofsb(lfsp, LFS_LABELPAD + LFS_SBPAD);
s = seg_buf + LFS_LABELPAD + LFS_SBPAD;
syslog(LOG_DEBUG, "adj segment 0 offset to 0x%x\n",
pseg_addr);
}
}
if(debug > 1)
syslog(LOG_DEBUG, "\tsegment buffer at: %p\tseg_addr 0x%x", s, seg_addr);
*bcount = 0;
for (nsegs = 0; nsegs < sup->su_nsums; nsegs++) {
sp = (SEGSUM *)s;
nblocks = pseg_valid(fsp, sp, pseg_addr);
if (nblocks <= 0) {
syslog(LOG_DEBUG, "Warning: invalid segment summary at 0x%x",
pseg_addr);
goto err0;
}
#ifdef DIAGNOSTIC
/* Verify size of summary block */
sumsize = (lfsp->lfs_version == 1 ? sizeof(SEGSUM_V1) :
sizeof(SEGSUM)) +
(sp->ss_ninos + INOPB(lfsp) - 1) / INOPB(lfsp);
if (lfsp->lfs_version == 1)
fip = (FINFO *)(((char *)sp) + sizeof(SEGSUM_V1));
else
fip = (FINFO *)(sp + 1);
for (i = 0; i < sp->ss_nfinfo; ++i) {
sumsize += sizeof(FINFO) +
(fip->fi_nblocks - 1) * sizeof(daddr_t);
fip = (FINFO *)(&fip->fi_blocks[fip->fi_nblocks]);
}
if (sumsize > lfsp->lfs_sumsize) {
syslog(LOG_ERR,
"Exiting: Segment %d summary block too big: %d\n",
seg, sumsize);
exit(1);
}
#endif
if (*bcount + nblocks + sp->ss_ninos > nelem) {
nelem = *bcount + nblocks + sp->ss_ninos;
bip = realloc (bip, nelem * sizeof(BLOCK_INFO_15));
if (!bip)
goto err0;
}
add_blocks(fsp, bip, bcount, sp, seg_buf, seg_addr, pseg_addr);
add_inodes(fsp, bip, bcount, sp, seg_buf, seg_addr);
ssize = pseg_size(pseg_addr, fsp, sp);
s += ssize;
pseg_addr += btofsb(lfsp, ssize);
}
if(nsegs < sup->su_nsums) {
syslog(LOG_WARNING,"only %d segment summaries in seg %d (expected %d)",
nsegs, seg, sup->su_nsums);
goto err0;
}
qsort(bip, *bcount, sizeof(BLOCK_INFO_15), bi_compare);
toss(bip, bcount, sizeof(BLOCK_INFO_15), bi_toss, NULL);
if(debug > 1) {
syslog(LOG_DEBUG, "BLOCK INFOS");
for (_bip = bip, i=0; i < *bcount; ++_bip, ++i)
PRINT_BINFO(_bip);
}
*blocks = bip;
return (0);
err0:
if (bip)
free(bip);
*bcount = 0;
return (-1);
}
/*
* This will parse a partial segment and fill in BLOCK_INFO_15 structures
* for each block described in the segment summary. It will not include
* blocks or inodes from files with new version numbers.
*/
void
add_blocks (FS_INFO *fsp, BLOCK_INFO_15 *bip, int *countp, SEGSUM *sp,
caddr_t seg_buf, daddr_t segaddr, daddr_t psegaddr)
{
IFILE *ifp;
FINFO *fip;
caddr_t bp;
daddr_t *dp, *iaddrp;
int fsb_per_block, fsb_per_iblock, i, j;
int fsb_frag, iblks_seen;
u_long iblk_size, blk_size;
struct lfs *lfsp;
if(debug > 1)
syslog(LOG_DEBUG, "FILE INFOS");
lfsp = &fsp->fi_lfs;
fsb_per_block = fragstofsb(lfsp, lfsp->lfs_frag);
fsb_per_iblock = btofsb(lfsp, lfsp->lfs_ibsize);
blk_size = fsp->fi_lfs.lfs_bsize;
iblk_size = fsp->fi_lfs.lfs_ibsize;
bp = seg_buf + fsbtob(lfsp, psegaddr - segaddr) + lfsp->lfs_sumsize;
bip += *countp;
psegaddr += btofsb(lfsp, lfsp->lfs_sumsize);
iaddrp = (daddr_t *)((caddr_t)sp + lfsp->lfs_sumsize);
--iaddrp;
if (lfsp->lfs_version == 1)
fip = (FINFO *)(((char *)sp) + sizeof(SEGSUM_V1));
else
fip = (FINFO *)(sp + 1);
iblks_seen = 0;
for (i = 0; i < sp->ss_nfinfo;
++i, fip = (FINFO *)(&fip->fi_blocks[fip->fi_nblocks])) {
ifp = IFILE_ENTRY(&fsp->fi_lfs, fsp->fi_ifilep, fip->fi_ino);
PRINT_FINFO(fip, ifp);
dp = &(fip->fi_blocks[0]);
for (j = 0; j < fip->fi_nblocks; j++, dp++) {
/* Skip over intervening inode blocks */
while (psegaddr == *iaddrp) {
/* syslog(LOG_DEBUG, "skipping ino block at 0x%x",
psegaddr); */
psegaddr += fsb_per_iblock;
bp += iblk_size;
--iaddrp;
}
bip->bi_inode = fip->fi_ino;
bip->bi_lbn = *dp;
bip->bi_daddr = psegaddr;
if (lfsp->lfs_version == 1)
bip->bi_segcreate = (time_t)(sp->ss_ident);
else
bip->bi_segcreate = (time_t)(sp->ss_create);
/* syslog(LOG_DEBUG, "ino %d lbn %d 0x%x %p",
bip->bi_inode, bip->bi_lbn, bip->bi_daddr,
bp); */
bip->bi_bp = bp;
bip->bi_version = ifp->if_version;
if (j < fip->fi_nblocks-1
|| fip->fi_lastlength == blk_size)
{
bip->bi_size = blk_size;
psegaddr += fsb_per_block;
bp += blk_size;
} else {
fsb_frag = fragstofsb(&(fsp->fi_lfs),
numfrags(&(fsp->fi_lfs),
fip->fi_lastlength));
if(debug > 1) {
syslog(LOG_DEBUG, "lastlength, frags: %d, %d",
fip->fi_lastlength, fsb_frag);
}
bip->bi_size = fip->fi_lastlength;
bp += fip->fi_lastlength;
psegaddr += fsb_frag;
}
if (ifp->if_version == fip->fi_version) {
++bip;
++(*countp);
}
}
}
}
/*
* For a particular segment summary, reads the inode blocks and adds
* INODE_INFO structures to the array. Returns the number of inodes
* actually added.
*/
void
add_inodes (FS_INFO *fsp, BLOCK_INFO_15 *bip, int *countp, SEGSUM *sp,
caddr_t seg_buf, daddr_t seg_addr)
{
struct dinode *di = NULL; /* XXX gcc */
struct lfs *lfsp;
IFILE *ifp;
BLOCK_INFO_15 *bp;
daddr_t *daddrp;
ino_t inum;
int i;
if (sp->ss_ninos <= 0)
return;
bp = bip + *countp;
lfsp = &fsp->fi_lfs;
if(debug > 1)
syslog(LOG_DEBUG, "INODES:");
daddrp = (daddr_t *)((caddr_t)sp + lfsp->lfs_sumsize);
for (i = 0; i < sp->ss_ninos; ++i) {
if (i % INOPB(lfsp) == 0) {
--daddrp;
di = (struct dinode *)(seg_buf + fsbtob(lfsp,
*daddrp - seg_addr));
} else
++di;
inum = di->di_inumber;
bp->bi_lbn = LFS_UNUSED_LBN;
bp->bi_inode = inum;
bp->bi_daddr = *daddrp;
bp->bi_bp = di;
if (lfsp->lfs_version == 1)
bp->bi_segcreate = sp->ss_ident;
else
bp->bi_segcreate = sp->ss_create;
bp->bi_size = i; /* XXX KS - kludge */
if (inum == LFS_IFILE_INUM) {
bp->bi_version = 1; /* Ifile version should be 1 */
bp++;
++(*countp);
PRINT_INODE(1, bp);
} else {
ifp = IFILE_ENTRY(lfsp, fsp->fi_ifilep, inum);
PRINT_INODE(ifp->if_daddr == *daddrp, bp);
bp->bi_version = ifp->if_version;
if (ifp->if_daddr == *daddrp) {
bp++;
++(*countp);
}
}
}
}
/*
* Checks the summary checksum and the data checksum to determine if the
* segment is valid or not. Returns the size of the partial segment if it
* is valid, and 0 otherwise. Use dump_summary to figure out size of the
* the partial as well as whether or not the checksum is valid.
*/
int
pseg_valid (FS_INFO *fsp, SEGSUM *ssp, daddr_t addr)
{
int nblocks;
#if 0
caddr_t p;
int i;
u_long *datap;
#endif
if (ssp->ss_magic != SS_MAGIC) {
syslog(LOG_WARNING, "Bad magic number: 0x%x instead of 0x%x", ssp->ss_magic, SS_MAGIC);
return(0);
}
if ((nblocks = dump_summary(&fsp->fi_lfs, ssp, 0, NULL, addr)) <= 0 ||
nblocks > (fsp->fi_lfs.lfs_ssize / fsp->fi_lfs.lfs_fsize) - 1)
return(0);
#if 0
/* check data/inode block(s) checksum too */
datap = (u_long *)malloc(nblocks * sizeof(u_long));
p = (caddr_t)ssp + lfsp->lfs_sumsize;
for (i = 0; i < nblocks; ++i) {
datap[i] = *((u_long *)p);
p += fsp->fi_lfs.lfs_bsize;
}
if (cksum ((void *)datap, nblocks * sizeof(u_long)) != ssp->ss_datasum) {
syslog(LOG_WARNING, "Bad data checksum");
free(datap);
return 0;
}
#endif
return (nblocks);
}
/* #define MMAP_SEGMENT */
/*
* read a segment into a memory buffer
*/
int
mmap_segment (FS_INFO *fsp, int segment, caddr_t *segbuf, int use_mmap)
{
struct lfs *lfsp;
daddr_t seg_daddr; /* base disk address of segment */
off_t seg_byte;
size_t ssize;
char mntfromname[MNAMELEN+2];
lfsp = &fsp->fi_lfs;
/* get the disk address of the beginning of the segment */
seg_daddr = sntod(lfsp, segment);
seg_byte = fsbtob(lfsp, (off_t)seg_daddr);
ssize = seg_size(lfsp);
strcpy(mntfromname, "/dev/r");
strcat(mntfromname, fsp->fi_statfsp->f_mntfromname+5);
if(dev_fd <= 0) {
if ((dev_fd = open(mntfromname, O_RDONLY, (mode_t)0)) < 0) {
syslog(LOG_WARNING,"mmap_segment: bad open: %m");
return (-1);
}
} else
lseek(dev_fd, 0, SEEK_SET);
if (use_mmap) {
*segbuf = mmap ((caddr_t)0, seg_size(lfsp), PROT_READ,
MAP_FILE|MAP_SHARED, dev_fd, seg_byte);
if (*(long *)segbuf < 0) {
syslog(LOG_WARNING,"mmap_segment: mmap failed: %m");
return (0);
}
} else {
if(debug > 1)
syslog(LOG_DEBUG, "mmap_segment\tseg_daddr: %lu\tseg_size: %lu\tseg_offset: %llu",
(u_long)seg_daddr, (u_long)ssize, (long long)seg_byte);
/* malloc the space for the buffer */
*segbuf = malloc(ssize);
if (!*segbuf) {
syslog(LOG_WARNING,"mmap_segment: malloc failed: %m");
return (0);
}
/* read the segment data into the buffer */
if (lseek (dev_fd, seg_byte, SEEK_SET) != seg_byte) {
syslog(LOG_WARNING,"mmap_segment: bad lseek: %m");
free(*segbuf);
return (-1);
}
if (read (dev_fd, *segbuf, ssize) != ssize) {
syslog(LOG_WARNING,"mmap_segment: bad read: %m");
free(*segbuf);
return (-1);
}
}
/* close (fid); */
return (0);
}
void
munmap_segment (FS_INFO *fsp, caddr_t seg_buf, int use_mmap)
{
if (use_mmap)
munmap (seg_buf, seg_size(&fsp->fi_lfs));
else
free (seg_buf);
}
/*
* USEFUL DEBUGGING TOOLS:
*/
void
print_SEGSUM (struct lfs *lfsp, SEGSUM *p, daddr_t addr)
{
if (p)
(void) dump_summary(lfsp, p, DUMP_ALL, NULL, addr);
else
syslog(LOG_DEBUG, "0x0");
}
int
bi_compare(const void *a, const void *b)
{
const BLOCK_INFO_15 *ba, *bb;
int diff;
ba = a;
bb = b;
if ((diff = (int)(ba->bi_inode - bb->bi_inode)))
return (diff);
if ((diff = (int)(ba->bi_lbn - bb->bi_lbn))) {
if (ba->bi_lbn == LFS_UNUSED_LBN)
return(-1);
else if (bb->bi_lbn == LFS_UNUSED_LBN)
return(1);
else if (ba->bi_lbn < 0 && bb->bi_lbn >= 0)
return(1);
else if (bb->bi_lbn < 0 && ba->bi_lbn >= 0)
return(-1);
else
return (diff);
}
if ((diff = (int)(ba->bi_daddr - bb->bi_daddr)))
return (diff);
if(ba->bi_inode != LFS_IFILE_INUM && debug)
syslog(LOG_DEBUG,"bi_compare: using kludge on ino %d!", ba->bi_inode);
diff = ba->bi_size - bb->bi_size;
return diff;
}
int
bi_toss(const void *dummy, const void *a, const void *b)
{
const BLOCK_INFO_15 *ba, *bb;
ba = a;
bb = b;
return(ba->bi_inode == bb->bi_inode && ba->bi_lbn == bb->bi_lbn);
}
void
toss(void *p, int *nump, size_t size, int (*dotoss)(const void *, const void *, const void *), void *client)
{
int i;
char *p0, *p1;
if (*nump == 0)
return;
p0 = p;
for (i = *nump; --i > 0;) {
p1 = p0 + size;
if (dotoss(client, p0, p1)) {
memmove(p0, p1, i * size);
--(*nump);
} else
p0 += size;
}
}
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