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authorrgrimes <rgrimes@FreeBSD.org>1994-05-26 06:35:07 +0000
committerrgrimes <rgrimes@FreeBSD.org>1994-05-26 06:35:07 +0000
commitd038e02fd667ab6c02875840105798aaa7029504 (patch)
treeb555a2b228429d62f4946ae1a7e68c33012e1b03 /sbin/dump/traverse.c
parente3cfc8ce61f788739c66445d903f8beacb40c93d (diff)
downloadFreeBSD-src-d038e02fd667ab6c02875840105798aaa7029504.zip
FreeBSD-src-d038e02fd667ab6c02875840105798aaa7029504.tar.gz
BSD 4.4 Lite sbin Sources
Note: XNSrouted and routed NOT imported here, they shall be imported with usr.sbin.
Diffstat (limited to 'sbin/dump/traverse.c')
-rw-r--r--sbin/dump/traverse.c613
1 files changed, 613 insertions, 0 deletions
diff --git a/sbin/dump/traverse.c b/sbin/dump/traverse.c
new file mode 100644
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--- /dev/null
+++ b/sbin/dump/traverse.c
@@ -0,0 +1,613 @@
+/*-
+ * 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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)traverse.c 8.2 (Berkeley) 9/23/93";
+#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/ffs/fs.h>
+#include <ufs/ufs/dir.h>
+#include <ufs/ufs/dinode.h>
+#endif
+
+#include <protocols/dumprestore.h>
+
+#include <ctype.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 long 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)
+ 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);
+}
+
+/* Auxiliary macro to pick up files changed since previous dump. */
+#ifdef FS_44INODEFMT
+#define CHANGEDSINCE(dp, t) \
+ ((dp)->di_mtime.ts_sec >= (t) || (dp)->di_ctime.ts_sec >= (t))
+#else
+#define CHANGEDSINCE(dp, t) \
+ ((dp)->di_mtime >= (t) || (dp)->di_ctime >= (t))
+#endif
+
+/* The WANTTODUMP macro decides whether a file should be dumped. */
+#ifdef UF_NODUMP
+#define WANTTODUMP(dp) \
+ (CHANGEDSINCE(dp, spcl.c_ddate) && \
+ (nonodump || ((dp)->di_flags & UF_NODUMP) != UF_NODUMP))
+#else
+#define WANTTODUMP(dp) CHANGEDSINCE(dp, spcl.c_ddate)
+#endif
+
+/*
+ * 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)
+ 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 (WANTTODUMP(dp)) {
+ SETINO(ino, dumpinomap);
+ if (mode != IFREG && mode != IFDIR && mode != IFLNK)
+ *tapesize += 1;
+ else
+ *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.
+ */
+int
+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;
+
+ 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, 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;
+ 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.
+ */
+static int
+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;
+ fsizeT 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 (dp->di_mode & S_IFMT) {
+
+ case 0:
+ /*
+ * Freed inode.
+ */
+ return;
+
+ case S_IFLNK:
+ /*
+ * Check for short symbolic link.
+ */
+#ifdef FS_44INODEFMT
+ 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
+ /* fall through */
+
+ case S_IFDIR:
+ case S_IFREG:
+ if (dp->di_size > 0)
+ break;
+ /* fall through */
+
+ case S_IFIFO:
+ case S_IFSOCK:
+ case S_IFCHR:
+ case S_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, 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, ino_to_fsba(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);
+ }
+}
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