600 lines
15 KiB
C
600 lines
15 KiB
C
/*-
|
|
* Copyright (c) 1980, 1988, 1991 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
/* from: static char sccsid[] = "@(#)traverse.c 5.21 (Berkeley) 7/19/92"; */
|
|
static char *rcsid = "$Id: traverse.c,v 1.3 1994/04/25 18:22:50 cgd Exp $";
|
|
#endif /* not lint */
|
|
|
|
#ifdef sunos
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <sys/param.h>
|
|
#include <ufs/fs.h>
|
|
#else
|
|
#include <sys/param.h>
|
|
#include <ufs/fs.h>
|
|
#endif
|
|
#include <sys/time.h>
|
|
#include <sys/stat.h>
|
|
#include <ufs/dir.h>
|
|
#include <ufs/dinode.h>
|
|
#include <protocols/dumprestore.h>
|
|
#ifdef __STDC__
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#endif
|
|
#include "dump.h"
|
|
|
|
void dmpindir();
|
|
#define HASDUMPEDFILE 0x1
|
|
#define HASSUBDIRS 0x2
|
|
|
|
/*
|
|
* This is an estimation of the number of TP_BSIZE blocks in the file.
|
|
* It estimates the number of blocks in files with holes by assuming
|
|
* that all of the blocks accounted for by di_blocks are data blocks
|
|
* (when some of the blocks are usually used for indirect pointers);
|
|
* hence the estimate may be high.
|
|
*/
|
|
long
|
|
blockest(dp)
|
|
register struct dinode *dp;
|
|
{
|
|
long blkest, sizeest;
|
|
|
|
/*
|
|
* dp->di_size is the size of the file in bytes.
|
|
* dp->di_blocks stores the number of sectors actually in the file.
|
|
* If there are more sectors than the size would indicate, this just
|
|
* means that there are indirect blocks in the file or unused
|
|
* sectors in the last file block; we can safely ignore these
|
|
* (blkest = sizeest below).
|
|
* If the file is bigger than the number of sectors would indicate,
|
|
* then the file has holes in it. In this case we must use the
|
|
* block count to estimate the number of data blocks used, but
|
|
* we use the actual size for estimating the number of indirect
|
|
* dump blocks (sizeest vs. blkest in the indirect block
|
|
* calculation).
|
|
*/
|
|
blkest = howmany(dbtob(dp->di_blocks), TP_BSIZE);
|
|
sizeest = howmany(dp->di_size, TP_BSIZE);
|
|
if (blkest > sizeest)
|
|
blkest = sizeest;
|
|
if (dp->di_size > sblock->fs_bsize * NDADDR) {
|
|
/* calculate the number of indirect blocks on the dump tape */
|
|
blkest +=
|
|
howmany(sizeest - NDADDR * sblock->fs_bsize / TP_BSIZE,
|
|
TP_NINDIR);
|
|
}
|
|
return (blkest + 1);
|
|
}
|
|
|
|
/*
|
|
* Dump pass 1.
|
|
*
|
|
* Walk the inode list for a filesystem to find all allocated inodes
|
|
* that have been modified since the previous dump time. Also, find all
|
|
* the directories in the filesystem.
|
|
*/
|
|
mapfiles(maxino, tapesize)
|
|
ino_t maxino;
|
|
long *tapesize;
|
|
{
|
|
register int mode;
|
|
register ino_t ino;
|
|
register struct dinode *dp;
|
|
int anydirskipped = 0;
|
|
|
|
for (ino = ROOTINO; ino < maxino; ino++) {
|
|
dp = getino(ino);
|
|
if ((mode = (dp->di_mode & IFMT)) == 0)
|
|
continue;
|
|
SETINO(ino, usedinomap);
|
|
if (mode == IFDIR)
|
|
SETINO(ino, dumpdirmap);
|
|
if ((dp->di_mtime.ts_sec >= spcl.c_ddate ||
|
|
dp->di_ctime.ts_sec >= spcl.c_ddate)
|
|
#ifdef BSD44
|
|
# ifndef sunos
|
|
&& (dp->di_flags & NODUMP) != NODUMP
|
|
# endif /* sunos */
|
|
#endif /* BSD44 */
|
|
) {
|
|
SETINO(ino, dumpinomap);
|
|
if (mode != IFREG && mode != IFDIR && mode != IFLNK) {
|
|
*tapesize += 1;
|
|
continue;
|
|
}
|
|
*tapesize += blockest(dp);
|
|
continue;
|
|
}
|
|
if (mode == IFDIR)
|
|
anydirskipped = 1;
|
|
}
|
|
/*
|
|
* Restore gets very upset if the root is not dumped,
|
|
* so ensure that it always is dumped.
|
|
*/
|
|
SETINO(ROOTINO, dumpinomap);
|
|
return (anydirskipped);
|
|
}
|
|
|
|
/*
|
|
* Dump pass 2.
|
|
*
|
|
* Scan each directory on the filesystem to see if it has any modified
|
|
* files in it. If it does, and has not already been added to the dump
|
|
* list (because it was itself modified), then add it. If a directory
|
|
* has not been modified itself, contains no modified files and has no
|
|
* subdirectories, then it can be deleted from the dump list and from
|
|
* the list of directories. By deleting it from the list of directories,
|
|
* its parent may now qualify for the same treatment on this or a later
|
|
* pass using this algorithm.
|
|
*/
|
|
mapdirs(maxino, tapesize)
|
|
ino_t maxino;
|
|
long *tapesize;
|
|
{
|
|
register struct dinode *dp;
|
|
register int i, isdir;
|
|
register char *map;
|
|
register ino_t ino;
|
|
long filesize;
|
|
int ret, change = 0;
|
|
|
|
for (map = dumpdirmap, ino = 0; ino < maxino; ) {
|
|
if ((ino % NBBY) == 0)
|
|
isdir = *map++;
|
|
else
|
|
isdir >>= 1;
|
|
ino++;
|
|
if ((isdir & 1) == 0 || TSTINO(ino, dumpinomap))
|
|
continue;
|
|
dp = getino(ino);
|
|
filesize = dp->di_size;
|
|
for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) {
|
|
if (dp->di_db[i] != 0)
|
|
ret |= searchdir(ino, dp->di_db[i],
|
|
(long)dblksize(sblock, dp, i),
|
|
filesize);
|
|
if (ret & HASDUMPEDFILE)
|
|
filesize = 0;
|
|
else
|
|
filesize -= sblock->fs_bsize;
|
|
}
|
|
for (i = 0; filesize > 0 && i < NIADDR; i++) {
|
|
if (dp->di_ib[i] == 0)
|
|
continue;
|
|
ret |= dirindir(ino, dp->di_ib[i], i, &filesize);
|
|
}
|
|
if (ret & HASDUMPEDFILE) {
|
|
SETINO(ino, dumpinomap);
|
|
*tapesize += blockest(dp);
|
|
change = 1;
|
|
continue;
|
|
}
|
|
if ((ret & HASSUBDIRS) == 0) {
|
|
if (!TSTINO(ino, dumpinomap)) {
|
|
CLRINO(ino, dumpdirmap);
|
|
change = 1;
|
|
}
|
|
}
|
|
}
|
|
return (change);
|
|
}
|
|
|
|
/*
|
|
* Read indirect blocks, and pass the data blocks to be searched
|
|
* as directories. Quit as soon as any entry is found that will
|
|
* require the directory to be dumped.
|
|
*/
|
|
dirindir(ino, blkno, ind_level, filesize)
|
|
ino_t ino;
|
|
daddr_t blkno;
|
|
int ind_level;
|
|
long *filesize;
|
|
{
|
|
int ret = 0;
|
|
register int i;
|
|
daddr_t idblk[MAXNINDIR];
|
|
|
|
bread(fsbtodb(sblock, blkno), (char *)idblk, (int)sblock->fs_bsize);
|
|
if (ind_level <= 0) {
|
|
for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
|
|
blkno = idblk[i];
|
|
if (blkno != 0)
|
|
ret |= searchdir(ino, blkno, sblock->fs_bsize,
|
|
*filesize);
|
|
if (ret & HASDUMPEDFILE)
|
|
*filesize = 0;
|
|
else
|
|
*filesize -= sblock->fs_bsize;
|
|
}
|
|
return (ret);
|
|
}
|
|
ind_level--;
|
|
for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
|
|
blkno = idblk[i];
|
|
if (blkno != 0)
|
|
ret |= dirindir(ino, blkno, ind_level, filesize);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Scan a disk block containing directory information looking to see if
|
|
* any of the entries are on the dump list and to see if the directory
|
|
* contains any subdirectories.
|
|
*/
|
|
searchdir(ino, blkno, size, filesize)
|
|
ino_t ino;
|
|
daddr_t blkno;
|
|
register long size;
|
|
long filesize;
|
|
{
|
|
register struct direct *dp;
|
|
register long loc, ret = 0;
|
|
char dblk[MAXBSIZE];
|
|
|
|
bread(fsbtodb(sblock, blkno), dblk, (int)size);
|
|
if (filesize < size)
|
|
size = filesize;
|
|
for (loc = 0; loc < size; ) {
|
|
dp = (struct direct *)(dblk + loc);
|
|
if (dp->d_reclen == 0) {
|
|
msg("corrupted directory, inumber %d\n", ino);
|
|
break;
|
|
}
|
|
loc += dp->d_reclen;
|
|
if (dp->d_ino == 0)
|
|
continue;
|
|
if (dp->d_name[0] == '.') {
|
|
if (dp->d_name[1] == '\0')
|
|
continue;
|
|
if (dp->d_name[1] == '.' && dp->d_name[2] == '\0')
|
|
continue;
|
|
}
|
|
if (TSTINO(dp->d_ino, dumpinomap)) {
|
|
ret |= HASDUMPEDFILE;
|
|
if (ret & HASSUBDIRS)
|
|
break;
|
|
}
|
|
if (TSTINO(dp->d_ino, dumpdirmap)) {
|
|
ret |= HASSUBDIRS;
|
|
if (ret & HASDUMPEDFILE)
|
|
break;
|
|
}
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Dump passes 3 and 4.
|
|
*
|
|
* Dump the contents of an inode to tape.
|
|
*/
|
|
void
|
|
dumpino(dp, ino)
|
|
register struct dinode *dp;
|
|
ino_t ino;
|
|
{
|
|
int ind_level, cnt;
|
|
long size;
|
|
char buf[TP_BSIZE];
|
|
|
|
if (newtape) {
|
|
newtape = 0;
|
|
dumpmap(dumpinomap, TS_BITS, ino);
|
|
}
|
|
CLRINO(ino, dumpinomap);
|
|
spcl.c_dinode = *dp;
|
|
spcl.c_type = TS_INODE;
|
|
spcl.c_count = 0;
|
|
|
|
switch (IFTODT(dp->di_mode)) {
|
|
|
|
case DT_UNKNOWN:
|
|
/*
|
|
* Freed inode.
|
|
*/
|
|
return;
|
|
|
|
case DT_LNK:
|
|
#ifdef BSD44
|
|
/*
|
|
* Check for short symbolic link.
|
|
*/
|
|
if (dp->di_size > 0 &&
|
|
dp->di_size < sblock->fs_maxsymlinklen) {
|
|
spcl.c_addr[0] = 1;
|
|
spcl.c_count = 1;
|
|
writeheader(ino);
|
|
bcopy((caddr_t)dp->di_shortlink, buf,
|
|
(u_long)dp->di_size);
|
|
buf[dp->di_size] = '\0';
|
|
writerec(buf, 0);
|
|
return;
|
|
}
|
|
#endif
|
|
#ifdef NetBSD
|
|
if (DFASTLINK(*dp)) {
|
|
spcl.c_addr[0] = 1;
|
|
spcl.c_count = 1;
|
|
writeheader(ino);
|
|
bcopy((caddr_t)dp->di_symlink, buf,
|
|
(u_long)dp->di_size);
|
|
buf[dp->di_size] = '\0';
|
|
writerec(buf, 0);
|
|
return;
|
|
}
|
|
#endif
|
|
/* fall through */
|
|
|
|
case DT_DIR:
|
|
case DT_REG:
|
|
if (dp->di_size > 0)
|
|
break;
|
|
/* fall through */
|
|
|
|
case DT_FIFO:
|
|
case DT_SOCK:
|
|
case DT_CHR:
|
|
case DT_BLK:
|
|
writeheader(ino);
|
|
return;
|
|
|
|
default:
|
|
msg("Warning: undefined file type 0%o\n", dp->di_mode & IFMT);
|
|
return;
|
|
}
|
|
|
|
if (dp->di_size > NDADDR * sblock->fs_bsize)
|
|
cnt = NDADDR * sblock->fs_frag;
|
|
else
|
|
cnt = howmany(dp->di_size, sblock->fs_fsize);
|
|
blksout(&dp->di_db[0], cnt, ino);
|
|
if ((size = dp->di_size - NDADDR * sblock->fs_bsize) <= 0)
|
|
return;
|
|
for (ind_level = 0; ind_level < NIADDR; ind_level++) {
|
|
dmpindir(ino, dp->di_ib[ind_level], ind_level, &size);
|
|
if (size <= 0)
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Read indirect blocks, and pass the data blocks to be dumped.
|
|
*/
|
|
void
|
|
dmpindir(ino, blk, ind_level, size)
|
|
ino_t ino;
|
|
daddr_t blk;
|
|
int ind_level;
|
|
long *size;
|
|
{
|
|
int i, cnt;
|
|
daddr_t idblk[MAXNINDIR];
|
|
|
|
if (blk != 0)
|
|
bread(fsbtodb(sblock, blk), (char *)idblk, (int) sblock->fs_bsize);
|
|
else
|
|
bzero((char *)idblk, (int)sblock->fs_bsize);
|
|
if (ind_level <= 0) {
|
|
if (*size < NINDIR(sblock) * sblock->fs_bsize)
|
|
cnt = howmany(*size, sblock->fs_fsize);
|
|
else
|
|
cnt = NINDIR(sblock) * sblock->fs_frag;
|
|
*size -= NINDIR(sblock) * sblock->fs_bsize;
|
|
blksout(&idblk[0], cnt, ino);
|
|
return;
|
|
}
|
|
ind_level--;
|
|
for (i = 0; i < NINDIR(sblock); i++) {
|
|
dmpindir(ino, idblk[i], ind_level, size);
|
|
if (*size <= 0)
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Collect up the data into tape record sized buffers and output them.
|
|
*/
|
|
void
|
|
blksout(blkp, frags, ino)
|
|
daddr_t *blkp;
|
|
int frags;
|
|
ino_t ino;
|
|
{
|
|
register daddr_t *bp;
|
|
int i, j, count, blks, tbperdb;
|
|
|
|
blks = howmany(frags * sblock->fs_fsize, TP_BSIZE);
|
|
tbperdb = sblock->fs_bsize >> tp_bshift;
|
|
for (i = 0; i < blks; i += TP_NINDIR) {
|
|
if (i + TP_NINDIR > blks)
|
|
count = blks;
|
|
else
|
|
count = i + TP_NINDIR;
|
|
for (j = i; j < count; j++)
|
|
if (blkp[j / tbperdb] != 0)
|
|
spcl.c_addr[j - i] = 1;
|
|
else
|
|
spcl.c_addr[j - i] = 0;
|
|
spcl.c_count = count - i;
|
|
writeheader(ino);
|
|
bp = &blkp[i / tbperdb];
|
|
for (j = i; j < count; j += tbperdb, bp++)
|
|
if (*bp != 0)
|
|
if (j + tbperdb <= count)
|
|
dumpblock(*bp, (int)sblock->fs_bsize);
|
|
else
|
|
dumpblock(*bp, (count - j) * TP_BSIZE);
|
|
spcl.c_type = TS_ADDR;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dump a map to the tape.
|
|
*/
|
|
void
|
|
dumpmap(map, type, ino)
|
|
char *map;
|
|
int type;
|
|
ino_t ino;
|
|
{
|
|
register int i;
|
|
char *cp;
|
|
|
|
spcl.c_type = type;
|
|
spcl.c_count = howmany(mapsize * sizeof(char), TP_BSIZE);
|
|
writeheader(ino);
|
|
for (i = 0, cp = map; i < spcl.c_count; i++, cp += TP_BSIZE)
|
|
writerec(cp, 0);
|
|
}
|
|
|
|
/*
|
|
* Write a header record to the dump tape.
|
|
*/
|
|
void
|
|
writeheader(ino)
|
|
ino_t ino;
|
|
{
|
|
register long sum, cnt, *lp;
|
|
|
|
spcl.c_inumber = ino;
|
|
spcl.c_magic = NFS_MAGIC;
|
|
spcl.c_checksum = 0;
|
|
lp = (long *)&spcl;
|
|
sum = 0;
|
|
cnt = sizeof(union u_spcl) / (4 * sizeof(long));
|
|
while (--cnt >= 0) {
|
|
sum += *lp++;
|
|
sum += *lp++;
|
|
sum += *lp++;
|
|
sum += *lp++;
|
|
}
|
|
spcl.c_checksum = CHECKSUM - sum;
|
|
writerec((char *)&spcl, 1);
|
|
}
|
|
|
|
struct dinode *
|
|
getino(inum)
|
|
ino_t inum;
|
|
{
|
|
static daddr_t minino, maxino;
|
|
static struct dinode inoblock[MAXINOPB];
|
|
|
|
curino = inum;
|
|
if (inum >= minino && inum < maxino)
|
|
return (&inoblock[inum - minino]);
|
|
bread(fsbtodb(sblock, itod(sblock, inum)), (char *)inoblock,
|
|
(int)sblock->fs_bsize);
|
|
minino = inum - (inum % INOPB(sblock));
|
|
maxino = minino + INOPB(sblock);
|
|
return (&inoblock[inum - minino]);
|
|
}
|
|
|
|
/*
|
|
* Read a chunk of data from the disk.
|
|
* Try to recover from hard errors by reading in sector sized pieces.
|
|
* Error recovery is attempted at most BREADEMAX times before seeking
|
|
* consent from the operator to continue.
|
|
*/
|
|
int breaderrors = 0;
|
|
#define BREADEMAX 32
|
|
|
|
void
|
|
bread(blkno, buf, size)
|
|
daddr_t blkno;
|
|
char *buf;
|
|
int size;
|
|
{
|
|
int cnt, i;
|
|
extern int errno;
|
|
|
|
loop:
|
|
if ((int)lseek(diskfd, ((off_t)blkno << dev_bshift), 0) < 0)
|
|
msg("bread: lseek fails\n");
|
|
if ((cnt = read(diskfd, buf, size)) == size)
|
|
return;
|
|
if (blkno + (size / dev_bsize) > fsbtodb(sblock, sblock->fs_size)) {
|
|
/*
|
|
* Trying to read the final fragment.
|
|
*
|
|
* NB - dump only works in TP_BSIZE blocks, hence
|
|
* rounds `dev_bsize' fragments up to TP_BSIZE pieces.
|
|
* It should be smarter about not actually trying to
|
|
* read more than it can get, but for the time being
|
|
* we punt and scale back the read only when it gets
|
|
* us into trouble. (mkm 9/25/83)
|
|
*/
|
|
size -= dev_bsize;
|
|
goto loop;
|
|
}
|
|
if (cnt == -1)
|
|
msg("read error from %s: %s: [block %d]: count=%d\n",
|
|
disk, strerror(errno), blkno, size);
|
|
else
|
|
msg("short read error from %s: [block %d]: count=%d, got=%d\n",
|
|
disk, blkno, size, cnt);
|
|
if (++breaderrors > BREADEMAX) {
|
|
msg("More than %d block read errors from %d\n",
|
|
BREADEMAX, disk);
|
|
broadcast("DUMP IS AILING!\n");
|
|
msg("This is an unrecoverable error.\n");
|
|
if (!query("Do you want to attempt to continue?")){
|
|
dumpabort(0);
|
|
/*NOTREACHED*/
|
|
} else
|
|
breaderrors = 0;
|
|
}
|
|
/*
|
|
* Zero buffer, then try to read each sector of buffer separately.
|
|
*/
|
|
bzero(buf, size);
|
|
for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) {
|
|
if ((int)lseek(diskfd, ((off_t)blkno << dev_bshift), 0) < 0)
|
|
msg("bread: lseek2 fails!\n");
|
|
if ((cnt = read(diskfd, buf, (int)dev_bsize)) == dev_bsize)
|
|
continue;
|
|
if (cnt == -1) {
|
|
msg("read error from %s: %s: [sector %d]: count=%d\n",
|
|
disk, strerror(errno), blkno, dev_bsize);
|
|
continue;
|
|
}
|
|
msg("short read error from %s: [sector %d]: count=%d, got=%d\n",
|
|
disk, blkno, dev_bsize, cnt);
|
|
}
|
|
}
|