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NetBSD/sbin/dump/traverse.c

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/* $NetBSD: traverse.c,v 1.22 1998/12/28 13:38:29 lukem Exp $ */
/*-
* Copyright (c) 1980, 1988, 1991, 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[] = "@(#)traverse.c 8.7 (Berkeley) 6/15/95";
#else
__RCSID("$NetBSD: traverse.c,v 1.22 1998/12/28 13:38:29 lukem Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#ifdef sunos
#include <sys/vnode.h>
#include <ufs/fs.h>
#include <ufs/fsdir.h>
#include <ufs/inode.h>
#else
#include <ufs/ufs/dir.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#endif
#include <protocols/dumprestore.h>
#include <ctype.h>
#include <errno.h>
#include <fts.h>
#include <stdio.h>
#ifdef __STDC__
#include <string.h>
#include <unistd.h>
#endif
#include "dump.h"
#define HASDUMPEDFILE 0x1
#define HASSUBDIRS 0x2
#ifdef FS_44INODEFMT
typedef quad_t fsizeT;
#else
typedef int32_t fsizeT;
#endif
static int dirindir __P((ino_t ino, daddr_t blkno, int level, long *size));
static void dmpindir __P((ino_t ino, daddr_t blk, int level, fsizeT *size));
static int searchdir __P((ino_t ino, daddr_t blkno, long size, long filesize));
/*
* 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)
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);
}
/* Auxiliary macro to pick up files changed since previous dump. */
#define CHANGEDSINCE(dp, t) \
((dp)->di_mtime >= (t) || (dp)->di_ctime >= (t))
/* The WANTTODUMP macro decides whether a file should be dumped. */
#ifdef UF_NODUMP
#define WANTTODUMP(dp) \
(CHANGEDSINCE(dp, iswap32(spcl.c_ddate)) && \
(nonodump || ((dp)->di_flags & UF_NODUMP) != UF_NODUMP))
#else
#define WANTTODUMP(dp) CHANGEDSINCE(dp, iswap32(spcl.c_ddate))
#endif
/*
* Determine if given inode should be dumped
*/
void
mapfileino(ino, tapesize, dirskipped)
ino_t ino;
long *tapesize;
int *dirskipped;
{
int mode;
struct dinode *dp;
/*
* Skip inode if we've already marked it for dumping
*/
if (TSTINO(ino, usedinomap))
return;
dp = getino(ino);
if ((mode = (dp->di_mode & IFMT)) == 0)
return;
SETINO(ino, usedinomap);
if (mode == IFDIR)
SETINO(ino, dumpdirmap);
if (WANTTODUMP(dp)) {
SETINO(ino, dumpinomap);
if (mode != IFREG && mode != IFDIR && mode != IFLNK)
*tapesize += 1;
else
*tapesize += blockest(dp);
return;
}
if (mode == IFDIR)
*dirskipped = 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.
*/
int
mapfiles(maxino, tapesize, disk, dirv)
ino_t maxino;
long *tapesize;
char *disk;
char * const *dirv;
{
int anydirskipped = 0;
if (dirv != NULL) {
char curdir[MAXPATHLEN];
FTS *dirh;
FTSENT *entry;
int d;
if (getcwd(curdir, sizeof(curdir)) == NULL) {
msg("Can't determine cwd: %s\n", strerror(errno));
dumpabort(0);
}
if ((dirh = fts_open(dirv, FTS_PHYSICAL|FTS_SEEDOT|FTS_XDEV,
NULL)) == NULL) {
msg("fts_open failed: %s\n", strerror(errno));
dumpabort(0);
}
while ((entry = fts_read(dirh)) != NULL) {
switch (entry->fts_info) {
case FTS_DNR: /* an error */
case FTS_ERR:
case FTS_NS:
msg("Can't fts_read %s: %s\n", entry->fts_path,
strerror(errno));
case FTS_DP: /* already seen dir */
continue;
}
mapfileino(entry->fts_statp->st_ino, tapesize,
&anydirskipped);
}
(void)fts_close(dirh);
/*
* Add any parent directories
*/
for (d = 0 ; dirv[d] != NULL ; d++) {
char path[MAXPATHLEN];
if (dirv[d][0] != '/')
(void)snprintf(path, sizeof(path), "%s/%s",
curdir, dirv[d]);
else
(void)snprintf(path, sizeof(path), "%s",
dirv[d]);
while (strcmp(path, disk) != 0) {
char *p;
struct stat sb;
if (*path == '\0')
break;
if ((p = strrchr(path, '/')) == NULL)
break;
if (p == path)
break;
*p = '\0';
if (stat(path, &sb) == -1) {
msg("Can't stat %s: %s\n", path,
strerror(errno));
break;
}
mapfileino(sb.st_ino, tapesize, &anydirskipped);
}
}
/*
* Ensure that the root inode actually appears in the
* file list for a subdir
*/
mapfileino(ROOTINO, tapesize, &anydirskipped);
} else {
ino_t ino;
for (ino = ROOTINO; ino < maxino; ino++) {
mapfileino(ino, tapesize, &anydirskipped);
}
}
/*
* 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.
*/
int
mapdirs(maxino, tapesize)
ino_t maxino;
long *tapesize;
{
struct dinode *dp;
int i, isdir;
char *map;
ino_t ino;
long filesize;
int ret, change = 0;
isdir = 0; /* XXX just to get gcc to shut up */
for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */
isdir = *map++;
else
isdir >>= 1;
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, iswap32(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.
*/
static int
dirindir(ino, blkno, ind_level, filesize)
ino_t ino;
daddr_t blkno;
int ind_level;
long *filesize;
{
int ret = 0;
int i;
daddr_t idblk[MAXNINDIR];
bread(fsbtodb(sblock, iswap32(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, iswap32(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.
*/
static int
searchdir(ino, blkno, size, filesize)
ino_t ino;
daddr_t blkno;
long size;
long filesize;
{
struct direct *dp;
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 += iswap16(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(iswap32(dp->d_ino), dumpinomap)) {
ret |= HASDUMPEDFILE;
if (ret & HASSUBDIRS)
break;
}
if (TSTINO(iswap32(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)
struct dinode *dp;
ino_t ino;
{
int ind_level, cnt;
fsizeT size;
char buf[TP_BSIZE];
if (newtape) {
newtape = 0;
dumpmap(dumpinomap, TS_BITS, ino);
}
CLRINO(ino, dumpinomap);
if (needswap)
ffs_dinode_swap(dp, &spcl.c_dinode);
else
spcl.c_dinode = *dp;
spcl.c_type = iswap32(TS_INODE);
spcl.c_count = 0;
switch (dp->di_mode & IFMT) {
case 0:
/*
* Freed inode.
*/
return;
case IFLNK:
/*
* Check for short symbolic link.
*/
if (dp->di_size > 0 &&
#ifdef FS_44INODEFMT
(dp->di_size < sblock->fs_maxsymlinklen ||
(sblock->fs_maxsymlinklen == 0 && dp->di_blocks == 0))) {
#else
dp->di_blocks == 0) {
#endif
spcl.c_addr[0] = 1;
spcl.c_count = iswap32(1);
writeheader(ino);
memmove(buf, dp->di_shortlink, (u_long)dp->di_size);
buf[dp->di_size] = '\0';
writerec(buf, 0);
return;
}
/* fall through */
case IFDIR:
case IFREG:
if (dp->di_size > 0)
break;
/* fall through */
case IFIFO:
case IFSOCK:
case IFCHR:
case IFBLK:
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.
*/
static void
dmpindir(ino, blk, ind_level, size)
ino_t ino;
daddr_t blk;
int ind_level;
fsizeT *size;
{
int i, cnt;
daddr_t idblk[MAXNINDIR];
if (blk != 0)
bread(fsbtodb(sblock, iswap32(blk)), (char *)idblk,
(int) sblock->fs_bsize);
else
memset(idblk, 0, (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;
{
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 = iswap32(count - i);
writeheader(ino);
bp = &blkp[i / tbperdb];
for (j = i; j < count; j += tbperdb, bp++)
if (*bp != 0) {
if (j + tbperdb <= count)
dumpblock(iswap32(*bp), (int)sblock->fs_bsize);
else
dumpblock(iswap32(*bp), (count - j) * TP_BSIZE);
}
spcl.c_type = iswap32(TS_ADDR);
}
}
/*
* Dump a map to the tape.
*/
void
dumpmap(map, type, ino)
char *map;
int type;
ino_t ino;
{
int i;
char *cp;
spcl.c_type = iswap32(type);
spcl.c_count = iswap32(howmany(mapsize * sizeof(char), TP_BSIZE));
writeheader(ino);
for (i = 0, cp = map; i < iswap32(spcl.c_count); i++, cp += TP_BSIZE)
writerec(cp, 0);
}
/*
* Write a header record to the dump tape.
*/
void
writeheader(ino)
ino_t ino;
{
int32_t sum, cnt, *lp;
spcl.c_inumber = iswap32(ino);
spcl.c_magic = iswap32(NFS_MAGIC);
spcl.c_checksum = 0;
lp = (int32_t *)&spcl;
sum = 0;
cnt = sizeof(union u_spcl) / (4 * sizeof(int32_t));
while (--cnt >= 0) {
sum += iswap32(*lp++);
sum += iswap32(*lp++);
sum += iswap32(*lp++);
sum += iswap32(*lp++);
}
spcl.c_checksum = iswap32(CHECKSUM - sum);
writerec((char *)&spcl, 1);
}
struct dinode *
getino(inum)
ino_t inum;
{
static daddr_t minino, maxino;
static struct dinode inoblock[MAXINOPB];
int i;
curino = inum;
if (inum >= minino && inum < maxino)
return (&inoblock[inum - minino]);
bread(fsbtodb(sblock, ino_to_fsba(sblock, inum)), (char *)inoblock,
(int)sblock->fs_bsize);
if (needswap)
for (i = 0; i < MAXINOPB; i++)
ffs_dinode_swap(&inoblock[i], &inoblock[i]);
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 (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.
*/
memset(buf, 0, size);
for (i = 0; i < size; i += dev_bsize, buf += dev_bsize, blkno++) {
if (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);
}
}
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