617 lines
16 KiB
C
617 lines
16 KiB
C
/*-
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* Copyright (c) 1980, 1988, 1991, 1993
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* The Regents of the University of California. 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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#if 0
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static char sccsid[] = "@(#)traverse.c 8.7 (Berkeley) 6/15/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <ufs/ufs/dir.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <protocols/dumprestore.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "dump.h"
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#define HASDUMPEDFILE 0x1
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#define HASSUBDIRS 0x2
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#ifdef FS_44INODEFMT
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typedef quad_t fsizeT;
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#else
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typedef long fsizeT;
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#endif
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static int dirindir(ino_t ino, daddr_t blkno, int level, long *size,
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long *tapesize, int nodump);
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static void dmpindir(ino_t ino, daddr_t blk, int level, fsizeT *size);
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static int searchdir(ino_t ino, daddr_t blkno, long size, long filesize,
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long *tapesize, int nodump);
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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(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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/* Auxiliary macro to pick up files changed since previous dump. */
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#define CHANGEDSINCE(dp, t) \
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((dp)->di_mtime >= (t) || (dp)->di_ctime >= (t))
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/* The WANTTODUMP macro decides whether a file should be dumped. */
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#ifdef UF_NODUMP
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#define WANTTODUMP(dp) \
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(CHANGEDSINCE(dp, spcl.c_ddate) && \
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(nonodump || ((dp)->di_flags & UF_NODUMP) != UF_NODUMP))
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#else
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#define WANTTODUMP(dp) CHANGEDSINCE(dp, spcl.c_ddate)
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#endif
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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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int
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mapfiles(ino_t maxino, long *tapesize)
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{
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int mode;
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ino_t ino;
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struct dinode *dp;
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int anydirskipped = 0;
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for (ino = ROOTINO; 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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/*
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* Everything must go in usedinomap so that a check
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* for "in dumpdirmap but not in usedinomap" to detect
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* dirs with nodump set has a chance of succeeding
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* (this is used in mapdirs()).
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*/
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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 (WANTTODUMP(dp)) {
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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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else
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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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if (!nonodump && (dp->di_flags & UF_NODUMP))
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CLRINO(ino, usedinomap);
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anydirskipped = 1;
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}
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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, dumpinomap);
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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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int
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mapdirs(ino_t maxino, long *tapesize)
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{
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struct dinode *dp;
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int i, isdir, nodump;
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char *map;
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ino_t ino;
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struct dinode di;
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long filesize;
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int ret, change = 0;
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isdir = 0; /* XXX just to get gcc to shut up */
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for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
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if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */
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isdir = *map++;
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else
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isdir >>= 1;
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/*
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* If a directory has been removed from usedinomap, it
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* either has the nodump flag set, or has inherited
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* it. Although a directory can't be in dumpinomap if
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* it isn't in usedinomap, we have to go through it to
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* propagate the nodump flag.
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*/
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nodump = !nonodump && (TSTINO(ino, usedinomap) == 0);
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if ((isdir & 1) == 0 || (TSTINO(ino, dumpinomap) && !nodump))
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continue;
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dp = getino(ino);
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di = *dp; /* inode buf may change in searchdir(). */
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filesize = di.di_size;
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for (ret = 0, i = 0; filesize > 0 && i < NDADDR; i++) {
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if (di.di_db[i] != 0)
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ret |= searchdir(ino, di.di_db[i],
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(long)dblksize(sblock, dp, i),
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filesize, tapesize, nodump);
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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 (di.di_ib[i] == 0)
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continue;
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ret |= dirindir(ino, di.di_ib[i], i, &filesize,
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tapesize, nodump);
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}
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if (ret & HASDUMPEDFILE) {
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SETINO(ino, dumpinomap);
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*tapesize += blockest(dp);
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change = 1;
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continue;
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}
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if (nodump) {
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if (ret & HASSUBDIRS)
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change = 1; /* subdirs inherit nodump */
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CLRINO(ino, dumpdirmap);
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} else 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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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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static int
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dirindir(ino_t ino, daddr_t blkno, int ind_level, long *filesize,
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long *tapesize, int nodump)
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{
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int ret = 0;
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int i;
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daddr_t idblk[MAXNINDIR];
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bread(fsbtodb(sblock, blkno), (char *)idblk, (int)sblock->fs_bsize);
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if (ind_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, tapesize, nodump);
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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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ind_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, ind_level, filesize,
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tapesize, nodump);
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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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static int
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searchdir(ino_t ino, daddr_t blkno, long size, long filesize,
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long *tapesize, int nodump)
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{
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struct direct *dp;
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struct dinode *ip;
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long loc, ret = 0;
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char dblk[MAXBSIZE];
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bread(fsbtodb(sblock, blkno), dblk, (int)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 (nodump) {
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ip = getino(dp->d_ino);
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if (TSTINO(dp->d_ino, dumpinomap)) {
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CLRINO(dp->d_ino, dumpinomap);
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*tapesize -= blockest(ip);
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}
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/*
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* Add back to dumpdirmap and remove from usedinomap
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* to propagate nodump.
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*/
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if ((ip->di_mode & IFMT) == IFDIR) {
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SETINO(dp->d_ino, dumpdirmap);
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CLRINO(dp->d_ino, usedinomap);
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ret |= HASSUBDIRS;
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}
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} else {
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if (TSTINO(dp->d_ino, dumpinomap)) {
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ret |= HASDUMPEDFILE;
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if (ret & HASSUBDIRS)
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break;
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}
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if (TSTINO(dp->d_ino, dumpdirmap)) {
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ret |= HASSUBDIRS;
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if (ret & HASDUMPEDFILE)
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break;
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}
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}
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}
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return (ret);
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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(struct dinode *dp, ino_t ino)
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{
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int ind_level, cnt;
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fsizeT size;
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char buf[TP_BSIZE];
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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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switch (dp->di_mode & S_IFMT) {
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case 0:
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/*
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* Freed inode.
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*/
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return;
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case S_IFLNK:
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/*
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* Check for short symbolic link.
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*/
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#ifdef FS_44INODEFMT
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if (dp->di_size > 0 &&
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dp->di_size < sblock->fs_maxsymlinklen) {
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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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memmove(buf, dp->di_shortlink, (u_long)dp->di_size);
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buf[dp->di_size] = '\0';
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writerec(buf, 0);
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return;
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}
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#endif
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/* fall through */
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case S_IFDIR:
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case S_IFREG:
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if (dp->di_size > 0)
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break;
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/* fall through */
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case S_IFIFO:
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case S_IFSOCK:
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case S_IFCHR:
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case S_IFBLK:
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writeheader(ino);
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return;
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default:
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msg("Warning: undefined file type 0%o\n", dp->di_mode & IFMT);
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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 (ind_level = 0; ind_level < NIADDR; ind_level++) {
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dmpindir(ino, dp->di_ib[ind_level], ind_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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static void
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dmpindir(ino_t ino, daddr_t blk, int ind_level, fsizeT *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, (int) sblock->fs_bsize);
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else
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memset(idblk, 0, (int)sblock->fs_bsize);
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if (ind_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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ind_level--;
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for (i = 0; i < NINDIR(sblock); i++) {
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dmpindir(ino, idblk[i], ind_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(daddr_t *blkp, int frags, ino_t ino)
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{
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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, (int)sblock->fs_bsize);
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else
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dumpblock(*bp, (count - j) * TP_BSIZE);
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}
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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(char *map, int type, ino_t ino)
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{
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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_t ino)
|
|
{
|
|
int32_t sum, cnt, *lp;
|
|
|
|
spcl.c_inumber = ino;
|
|
spcl.c_magic = 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 += *lp++;
|
|
sum += *lp++;
|
|
sum += *lp++;
|
|
sum += *lp++;
|
|
}
|
|
spcl.c_checksum = CHECKSUM - sum;
|
|
writerec((char *)&spcl, 1);
|
|
}
|
|
|
|
struct dinode *
|
|
getino(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(daddr_t blkno, char *buf, int size)
|
|
{
|
|
int cnt, i;
|
|
|
|
loop:
|
|
if ((cnt = pread(diskfd, buf, size, ((off_t)blkno << dev_bshift))) ==
|
|
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 ((cnt = pread(diskfd, buf, (int)dev_bsize,
|
|
((off_t)blkno << dev_bshift))) == 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);
|
|
}
|
|
}
|