526 lines
14 KiB
C
526 lines
14 KiB
C
/*-
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* Copyright (c) 1980, 1988, 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)dumptraverse.c 5.11 (Berkeley) 3/7/91";*/
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static char rcsid[] = "$Id: dumptraverse.c,v 1.6 1993/08/01 18:27:41 mycroft Exp $";
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#endif /* not lint */
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#include <sys/param.h>
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#include <ufs/dir.h>
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#include <ufs/dinode.h>
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#include <ufs/fs.h>
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#include <protocols/dumprestore.h>
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#ifdef __STDC__
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#include <unistd.h>
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#include <string.h>
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#endif
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#include "dump.h"
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void dmpindir();
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#define HASDUMPEDFILE 0x1
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#define HASSUBDIRS 0x2
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/*
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* This is an estimation of the number of TP_BSIZE blocks in the file.
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* It estimates the number of blocks in files with holes by assuming
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* that all of the blocks accounted for by di_blocks are data blocks
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* (when some of the blocks are usually used for indirect pointers);
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* hence the estimate may be high.
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*/
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long
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blockest(dp)
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register struct dinode *dp;
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{
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long blkest, sizeest;
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/*
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* dp->di_size is the size of the file in bytes.
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* dp->di_blocks stores the number of sectors actually in the file.
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* If there are more sectors than the size would indicate, this just
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* means that there are indirect blocks in the file or unused
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* sectors in the last file block; we can safely ignore these
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* (blkest = sizeest below).
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* If the file is bigger than the number of sectors would indicate,
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* then the file has holes in it. In this case we must use the
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* block count to estimate the number of data blocks used, but
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* we use the actual size for estimating the number of indirect
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* dump blocks (sizeest vs. blkest in the indirect block
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* calculation).
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*/
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blkest = howmany(dbtob(dp->di_blocks), TP_BSIZE);
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sizeest = howmany(dp->di_size, TP_BSIZE);
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if (blkest > sizeest)
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blkest = sizeest;
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if (dp->di_size > sblock->fs_bsize * NDADDR) {
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/* calculate the number of indirect blocks on the dump tape */
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blkest +=
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howmany(sizeest - NDADDR * sblock->fs_bsize / TP_BSIZE,
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TP_NINDIR);
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}
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return (blkest + 1);
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}
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/*
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* Dump pass 1.
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*
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* Walk the inode list for a filesystem to find all allocated inodes
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* that have been modified since the previous dump time. Also, find all
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* the directories in the filesystem.
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*/
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mapfiles(maxino, tapesize)
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ino_t maxino;
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long *tapesize;
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{
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register int mode;
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register ino_t ino;
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register struct dinode *dp;
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int anydirskipped = 0;
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for (ino = 0; ino <= maxino; ino++) {
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dp = getino(ino);
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if ((mode = (dp->di_mode & IFMT)) == 0)
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continue;
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SETINO(ino, usedinomap);
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if (mode == IFDIR)
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SETINO(ino, dumpdirmap);
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if (dp->di_mtime >= spcl.c_ddate ||
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dp->di_ctime >= spcl.c_ddate) {
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SETINO(ino, dumpinomap);
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if (mode != IFREG && mode != IFDIR && mode != IFLNK) {
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*tapesize += 1;
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continue;
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}
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*tapesize += blockest(dp);
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continue;
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}
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if (mode == IFDIR)
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anydirskipped = 1;
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}
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/*
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* Restore gets very upset if the root is not dumped,
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* so ensure that it always is dumped.
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*/
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SETINO(ROOTINO, usedinomap);
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return (anydirskipped);
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}
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/*
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* Dump pass 2.
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*
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* Scan each directory on the filesystem to see if it has any modified
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* files in it. If it does, and has not already been added to the dump
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* list (because it was itself modified), then add it. If a directory
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* has not been modified itself, contains no modified files and has no
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* subdirectories, then it can be deleted from the dump list and from
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* the list of directories. By deleting it from the list of directories,
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* its parent may now qualify for the same treatment on this or a later
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* pass using this algorithm.
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*/
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mapdirs(maxino, tapesize)
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ino_t maxino;
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long *tapesize;
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{
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register struct dinode *dp;
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register int i, dirty;
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register char *map;
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register ino_t ino;
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long filesize, blkcnt = 0;
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int ret, change = 0;
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for (map = dumpdirmap, ino = 0; ino < maxino; ) {
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if ((ino % NBBY) == 0)
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dirty = *map++;
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else
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dirty >>= 1;
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ino++;
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if ((dirty & 1) == 0 || TSTINO(ino, dumpinomap))
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continue;
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dp = getino(ino);
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filesize = dp->di_size;
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for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) {
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if (dp->di_db[i] != 0)
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ret |= searchdir(ino, dp->di_db[i],
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dblksize(sblock, dp, i), filesize);
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if (ret & HASDUMPEDFILE)
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filesize = 0;
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else
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filesize -= sblock->fs_bsize;
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}
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for (i = 0; filesize > 0 && i < NIADDR; i++) {
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if (dp->di_ib[i] == 0)
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continue;
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ret |= dirindir(ino, dp->di_ib[i], i, &filesize);
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}
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if (ret & HASDUMPEDFILE) {
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if (!TSTINO(ino, dumpinomap)) {
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SETINO(ino, dumpinomap);
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*tapesize += blockest(dp);
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}
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change = 1;
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continue;
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}
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if ((ret & HASSUBDIRS) == 0) {
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if (!TSTINO(ino, dumpinomap)) {
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CLRINO(ino, dumpdirmap);
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change = 1;
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}
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}
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}
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return (change);
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}
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/*
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* Read indirect blocks, and pass the data blocks to be searched
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* as directories. Quit as soon as any entry is found that will
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* require the directory to be dumped.
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*/
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dirindir(ino, blkno, level, filesize)
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ino_t ino;
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daddr_t blkno;
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int level, *filesize;
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{
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int ret = 0;
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register int i;
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daddr_t idblk[MAXNINDIR];
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bread(fsbtodb(sblock, blkno), (char *)idblk, sblock->fs_bsize);
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if (level <= 0) {
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for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
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blkno = idblk[i];
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if (blkno != 0)
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ret |= searchdir(ino, blkno, sblock->fs_bsize,
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filesize);
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if (ret & HASDUMPEDFILE)
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*filesize = 0;
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else
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*filesize -= sblock->fs_bsize;
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}
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return (ret);
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}
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level--;
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for (i = 0; *filesize > 0 && i < NINDIR(sblock); i++) {
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blkno = idblk[i];
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if (blkno != 0)
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ret |= dirindir(ino, blkno, level, filesize);
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}
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return (ret);
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}
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/*
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* Scan a disk block containing directory information looking to see if
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* any of the entries are on the dump list and to see if the directory
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* contains any subdirectories.
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*/
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searchdir(ino, blkno, size, filesize)
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ino_t ino;
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daddr_t blkno;
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register int size;
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int filesize;
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{
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register struct direct *dp;
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register long loc;
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char dblk[MAXBSIZE];
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bread(fsbtodb(sblock, blkno), dblk, size);
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if (filesize < size)
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size = filesize;
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for (loc = 0; loc < size; ) {
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dp = (struct direct *)(dblk + loc);
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if (dp->d_reclen == 0) {
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msg("corrupted directory, inumber %d\n", ino);
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break;
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}
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loc += dp->d_reclen;
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if (dp->d_ino == 0)
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continue;
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if (dp->d_name[0] == '.') {
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if (dp->d_name[1] == '\0')
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continue;
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if (dp->d_name[1] == '.' && dp->d_name[2] == '\0')
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continue;
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}
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if (TSTINO(dp->d_ino, dumpinomap))
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return (HASDUMPEDFILE);
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if (TSTINO(dp->d_ino, dumpdirmap))
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return (HASSUBDIRS);
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}
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return (0);
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}
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/*
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* Dump passes 3 and 4.
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*
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* Dump the contents of an inode to tape.
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*/
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void
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dumpino(dp, ino)
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register struct dinode *dp;
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ino_t ino;
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{
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int mode, level, cnt;
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long size;
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if (newtape) {
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newtape = 0;
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dumpmap(dumpinomap, TS_BITS, ino);
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}
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CLRINO(ino, dumpinomap);
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spcl.c_dinode = *dp;
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spcl.c_type = TS_INODE;
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spcl.c_count = 0;
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/*
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* Check for freed inode.
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*/
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if ((mode = (dp->di_mode & IFMT)) == 0)
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return;
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if ((mode != IFDIR && mode != IFREG && mode != IFLNK) ||
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dp->di_size == 0) {
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writeheader(ino);
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return;
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}
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if (DFASTLINK(*dp)) {
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spcl.c_addr[0] = 1;
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spcl.c_count = 1;
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writeheader(ino);
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writerec(dp->di_symlink);
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return;
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}
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if (dp->di_size > NDADDR * sblock->fs_bsize)
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cnt = NDADDR * sblock->fs_frag;
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else
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cnt = howmany(dp->di_size, sblock->fs_fsize);
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blksout(&dp->di_db[0], cnt, ino);
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if ((size = dp->di_size - NDADDR * sblock->fs_bsize) <= 0)
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return;
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for (level = 0; level < NIADDR; level++) {
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dmpindir(ino, dp->di_ib[level], level, &size);
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if (size <= 0)
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return;
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}
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}
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/*
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* Read indirect blocks, and pass the data blocks to be dumped.
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*/
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void
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dmpindir(ino, blk, level, size)
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ino_t ino;
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daddr_t blk;
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int level;
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long *size;
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{
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int i, cnt;
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daddr_t idblk[MAXNINDIR];
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if (blk != 0)
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bread(fsbtodb(sblock, blk), (char *)idblk, sblock->fs_bsize);
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else
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bzero((char *)idblk, sblock->fs_bsize);
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if (level <= 0) {
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if (*size < NINDIR(sblock) * sblock->fs_bsize)
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cnt = howmany(*size, sblock->fs_fsize);
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else
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cnt = NINDIR(sblock) * sblock->fs_frag;
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*size -= NINDIR(sblock) * sblock->fs_bsize;
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blksout(&idblk[0], cnt, ino);
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return;
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}
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level--;
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for (i = 0; i < NINDIR(sblock); i++) {
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dmpindir(ino, idblk[i], level, size);
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if (*size <= 0)
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return;
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}
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}
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/*
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* Collect up the data into tape record sized buffers and output them.
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*/
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void
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blksout(blkp, frags, ino)
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daddr_t *blkp;
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int frags;
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ino_t ino;
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{
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register daddr_t *bp;
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int i, j, count, blks, tbperdb;
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blks = howmany(frags * sblock->fs_fsize, TP_BSIZE);
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tbperdb = sblock->fs_bsize >> tp_bshift;
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for (i = 0; i < blks; i += TP_NINDIR) {
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if (i + TP_NINDIR > blks)
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count = blks;
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else
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count = i + TP_NINDIR;
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for (j = i; j < count; j++)
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if (blkp[j / tbperdb] != 0)
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spcl.c_addr[j - i] = 1;
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else
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spcl.c_addr[j - i] = 0;
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spcl.c_count = count - i;
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writeheader(ino);
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bp = &blkp[i / tbperdb];
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for (j = i; j < count; j += tbperdb, bp++)
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if (*bp != 0)
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if (j + tbperdb <= count)
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dumpblock(*bp, sblock->fs_bsize);
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else
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dumpblock(*bp, (count - j) * TP_BSIZE);
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spcl.c_type = TS_ADDR;
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}
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}
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/*
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* Dump a map to the tape.
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*/
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void
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dumpmap(map, type, ino)
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char *map;
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int type;
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ino_t ino;
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{
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register int i;
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char *cp;
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spcl.c_type = type;
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spcl.c_count = howmany(mapsize * sizeof(char), TP_BSIZE);
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writeheader(ino);
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for (i = 0, cp = map; i < spcl.c_count; i++, cp += TP_BSIZE)
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writerec(cp);
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}
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/*
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* Write a header record to the dump tape.
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*/
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void
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writeheader(ino)
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ino_t ino;
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{
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register long sum, cnt, *lp;
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spcl.c_inumber = ino;
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spcl.c_magic = NFS_MAGIC;
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spcl.c_checksum = 0;
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lp = (long *)&spcl;
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sum = 0;
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cnt = sizeof(union u_spcl) / (4 * sizeof(long));
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while (--cnt >= 0) {
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sum += *lp++;
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sum += *lp++;
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sum += *lp++;
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sum += *lp++;
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}
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spcl.c_checksum = CHECKSUM - sum;
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writerec((char *)&spcl);
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}
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struct dinode *
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getino(inum)
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ino_t inum;
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{
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static daddr_t minino, maxino;
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static struct dinode inoblock[MAXINOPB];
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curino = inum;
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if (inum >= minino && inum < maxino)
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return (&inoblock[inum - minino]);
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bread(fsbtodb(sblock, itod(sblock, inum)), inoblock, sblock->fs_bsize);
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minino = inum - (inum % INOPB(sblock));
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maxino = minino + INOPB(sblock);
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return (&inoblock[inum - minino]);
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}
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/*
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* Read a chunk of data from the disk.
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* Try to recover from hard errors by reading in sector sized pieces.
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* Error recovery is attempted at most BREADEMAX times before seeking
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* consent from the operator to continue.
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*/
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int breaderrors = 0;
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#define BREADEMAX 32
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void
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bread(blkno, buf, size)
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daddr_t blkno;
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char *buf;
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int size;
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{
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int cnt, i;
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extern int errno;
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loop:
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if (lseek(diskfd, (long)(blkno << dev_bshift), 0) < 0)
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msg("bread: lseek fails\n");
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if ((cnt = read(diskfd, buf, size)) == size)
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return;
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if (blkno + (size / dev_bsize) > fsbtodb(sblock, sblock->fs_size)) {
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/*
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* Trying to read the final fragment.
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*
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* NB - dump only works in TP_BSIZE blocks, hence
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* rounds `dev_bsize' fragments up to TP_BSIZE pieces.
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* It should be smarter about not actually trying to
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* read more than it can get, but for the time being
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* we punt and scale back the read only when it gets
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* us into trouble. (mkm 9/25/83)
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*/
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size -= dev_bsize;
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goto loop;
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}
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msg("read error from %s [block %d]: count=%d, got=%d, errno=%d (%s)\n",
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disk, blkno, size, cnt, errno, strerror(errno));
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if (++breaderrors > BREADEMAX) {
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msg("More than %d block read errors from %d\n",
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BREADEMAX, disk);
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broadcast("DUMP IS AILING!\n");
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msg("This is an unrecoverable error.\n");
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if (!query("Do you want to attempt to continue?")){
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dumpabort();
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/*NOTREACHED*/
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} 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 (lseek(diskfd, (long)(blkno << dev_bshift), 0) < 0)
|
|
msg("bread: lseek2 fails!\n");
|
|
if ((cnt = read(diskfd, buf, dev_bsize)) != dev_bsize)
|
|
msg(" read error from %s [sector %d, errno %d]\n",
|
|
disk, blkno, errno);
|
|
}
|
|
}
|