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744 lines
18 KiB
744 lines
18 KiB
/*
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* logdump.c --- dump the contents of the journal out to a file
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*
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* Author: Stephen C. Tweedie, 2001 <sct@redhat.com>
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* Copyright (C) 2001 Red Hat, Inc.
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* Based on portions Copyright (C) 1994 Theodore Ts'o.
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*
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* This file may be redistributed under the terms of the GNU Public
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* License.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <time.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <utime.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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extern int optind;
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extern char *optarg;
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#endif
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#include "debugfs.h"
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#include "blkid/blkid.h"
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#include "jfs_user.h"
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#include <uuid/uuid.h>
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enum journal_location {JOURNAL_IS_INTERNAL, JOURNAL_IS_EXTERNAL};
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#define ANY_BLOCK ((blk64_t) -1)
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static int dump_all, dump_super, dump_old, dump_contents, dump_descriptors;
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static blk64_t block_to_dump, bitmap_to_dump, inode_block_to_dump;
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static unsigned int group_to_dump, inode_offset_to_dump;
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static ext2_ino_t inode_to_dump;
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struct journal_source
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{
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enum journal_location where;
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int fd;
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ext2_file_t file;
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};
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static void dump_journal(char *, FILE *, struct journal_source *);
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static void dump_descriptor_block(FILE *, struct journal_source *,
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char *, journal_superblock_t *,
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unsigned int *, int, tid_t);
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static void dump_revoke_block(FILE *, char *, journal_superblock_t *,
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unsigned int, int, tid_t);
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static void dump_metadata_block(FILE *, struct journal_source *,
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journal_superblock_t*,
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unsigned int, unsigned int, unsigned int,
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int, tid_t);
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static void do_hexdump (FILE *, char *, int);
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#define WRAP(jsb, blocknr) \
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if (blocknr >= be32_to_cpu((jsb)->s_maxlen)) \
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blocknr -= (be32_to_cpu((jsb)->s_maxlen) - \
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be32_to_cpu((jsb)->s_first));
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void do_logdump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
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void *infop EXT2FS_ATTR((unused)))
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{
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int c;
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int retval;
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char *out_fn;
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FILE *out_file;
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char *inode_spec = NULL;
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char *journal_fn = NULL;
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int journal_fd = 0;
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int use_sb = 0;
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ext2_ino_t journal_inum;
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struct ext2_inode journal_inode;
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ext2_file_t journal_file;
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char *tmp;
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struct journal_source journal_source;
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struct ext2_super_block *es = NULL;
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journal_source.where = JOURNAL_IS_INTERNAL;
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journal_source.fd = 0;
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journal_source.file = 0;
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dump_all = 0;
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dump_old = 0;
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dump_contents = 0;
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dump_super = 0;
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dump_descriptors = 1;
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block_to_dump = ANY_BLOCK;
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bitmap_to_dump = -1;
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inode_block_to_dump = ANY_BLOCK;
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inode_to_dump = -1;
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reset_getopt();
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while ((c = getopt (argc, argv, "ab:ci:f:OsS")) != EOF) {
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switch (c) {
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case 'a':
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dump_all++;
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break;
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case 'b':
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block_to_dump = strtoul(optarg, &tmp, 0);
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if (*tmp) {
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com_err(argv[0], 0,
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"Bad block number - %s", optarg);
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return;
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}
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dump_descriptors = 0;
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break;
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case 'c':
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dump_contents++;
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break;
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case 'f':
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journal_fn = optarg;
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break;
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case 'i':
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inode_spec = optarg;
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dump_descriptors = 0;
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break;
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case 'O':
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dump_old++;
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break;
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case 's':
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use_sb++;
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break;
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case 'S':
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dump_super++;
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break;
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default:
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goto print_usage;
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}
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}
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if (optind != argc && optind != argc-1) {
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goto print_usage;
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}
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if (current_fs)
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es = current_fs->super;
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if (inode_spec) {
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int inode_group, group_offset, inodes_per_block;
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if (check_fs_open(argv[0]))
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return;
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inode_to_dump = string_to_inode(inode_spec);
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if (!inode_to_dump)
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return;
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inode_group = ((inode_to_dump - 1)
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/ es->s_inodes_per_group);
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group_offset = ((inode_to_dump - 1)
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% es->s_inodes_per_group);
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inodes_per_block = (current_fs->blocksize
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/ sizeof(struct ext2_inode));
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inode_block_to_dump =
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ext2fs_inode_table_loc(current_fs, inode_group) +
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(group_offset / inodes_per_block);
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inode_offset_to_dump = ((group_offset % inodes_per_block)
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* sizeof(struct ext2_inode));
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printf("Inode %u is at group %u, block %llu, offset %u\n",
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inode_to_dump, inode_group,
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inode_block_to_dump, inode_offset_to_dump);
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}
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if (optind == argc) {
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out_file = stdout;
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} else {
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out_fn = argv[optind];
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out_file = fopen(out_fn, "w");
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if (!out_file) {
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com_err(argv[0], errno, "while opening %s for logdump",
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out_fn);
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goto errout;
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}
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}
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if (block_to_dump != ANY_BLOCK && current_fs != NULL) {
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group_to_dump = ((block_to_dump -
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es->s_first_data_block)
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/ es->s_blocks_per_group);
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bitmap_to_dump = ext2fs_block_bitmap_loc(current_fs, group_to_dump);
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}
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if (!journal_fn && check_fs_open(argv[0]))
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goto errout;
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if (journal_fn) {
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/* Set up to read journal from a regular file somewhere */
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journal_fd = open(journal_fn, O_RDONLY, 0);
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if (journal_fd < 0) {
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com_err(argv[0], errno, "while opening %s for logdump",
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journal_fn);
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goto errout;
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}
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journal_source.where = JOURNAL_IS_EXTERNAL;
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journal_source.fd = journal_fd;
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} else if ((journal_inum = es->s_journal_inum)) {
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if (use_sb) {
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if (es->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS) {
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com_err(argv[0], 0,
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"no journal backup in super block\n");
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goto errout;
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}
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memset(&journal_inode, 0, sizeof(struct ext2_inode));
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memcpy(&journal_inode.i_block[0], es->s_jnl_blocks,
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EXT2_N_BLOCKS*4);
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journal_inode.i_size_high = es->s_jnl_blocks[15];
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journal_inode.i_size = es->s_jnl_blocks[16];
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journal_inode.i_links_count = 1;
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journal_inode.i_mode = LINUX_S_IFREG | 0600;
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} else {
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if (debugfs_read_inode(journal_inum, &journal_inode,
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argv[0]))
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goto errout;
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}
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retval = ext2fs_file_open2(current_fs, journal_inum,
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&journal_inode, 0, &journal_file);
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if (retval) {
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com_err(argv[0], retval, "while opening ext2 file");
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goto errout;
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}
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journal_source.where = JOURNAL_IS_INTERNAL;
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journal_source.file = journal_file;
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} else {
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char uuid[37];
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uuid_unparse(es->s_journal_uuid, uuid);
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journal_fn = blkid_get_devname(NULL, "UUID", uuid);
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if (!journal_fn)
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journal_fn = blkid_devno_to_devname(es->s_journal_dev);
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if (!journal_fn) {
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com_err(argv[0], 0, "filesystem has no journal");
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goto errout;
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}
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journal_fd = open(journal_fn, O_RDONLY, 0);
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if (journal_fd < 0) {
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com_err(argv[0], errno, "while opening %s for logdump",
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journal_fn);
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free(journal_fn);
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goto errout;
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}
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fprintf(out_file, "Using external journal found at %s\n",
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journal_fn);
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free(journal_fn);
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journal_source.where = JOURNAL_IS_EXTERNAL;
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journal_source.fd = journal_fd;
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}
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dump_journal(argv[0], out_file, &journal_source);
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if (journal_source.where == JOURNAL_IS_INTERNAL)
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ext2fs_file_close(journal_file);
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else
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close(journal_fd);
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errout:
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if (out_file && (out_file != stdout))
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fclose(out_file);
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return;
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print_usage:
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fprintf(stderr, "%s: Usage: logdump [-acsOS] [-b<block>] [-i<filespec>]\n\t"
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"[-f<journal_file>] [output_file]\n", argv[0]);
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}
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static int read_journal_block(const char *cmd, struct journal_source *source,
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ext2_loff_t offset, char *buf, unsigned int size)
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{
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int retval;
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unsigned int got;
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if (source->where == JOURNAL_IS_EXTERNAL) {
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if (lseek(source->fd, offset, SEEK_SET) < 0) {
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retval = errno;
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goto seek_err;
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}
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retval = read(source->fd, buf, size);
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if (retval < 0) {
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retval = errno;
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goto read_err;
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}
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got = retval;
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retval = 0;
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} else {
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retval = ext2fs_file_llseek(source->file, offset,
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EXT2_SEEK_SET, NULL);
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if (retval) {
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seek_err:
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com_err(cmd, retval, "while seeking in reading journal");
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return retval;
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}
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retval = ext2fs_file_read(source->file, buf, size, &got);
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if (retval) {
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read_err:
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com_err(cmd, retval, "while reading journal");
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return retval;
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}
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}
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if (got != size) {
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com_err(cmd, 0, "short read (read %u, expected %u) "
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"while reading journal", got, size);
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retval = -1;
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}
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return retval;
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}
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static const char *type_to_name(int btype)
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{
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switch (btype) {
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case JFS_DESCRIPTOR_BLOCK:
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return "descriptor block";
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case JFS_COMMIT_BLOCK:
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return "commit block";
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case JFS_SUPERBLOCK_V1:
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return "V1 superblock";
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case JFS_SUPERBLOCK_V2:
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return "V2 superblock";
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case JFS_REVOKE_BLOCK:
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return "revoke table";
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}
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return "unrecognised type";
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}
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static void dump_journal(char *cmdname, FILE *out_file,
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struct journal_source *source)
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{
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struct ext2_super_block *sb;
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char jsb_buffer[1024];
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char buf[8192];
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journal_superblock_t *jsb;
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unsigned int blocksize = 1024;
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int retval;
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__u32 magic, sequence, blocktype;
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journal_header_t *header;
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tid_t transaction;
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unsigned int blocknr = 0;
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/* First, check to see if there's an ext2 superblock header */
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retval = read_journal_block(cmdname, source, 0, buf, 2048);
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if (retval)
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return;
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jsb = (journal_superblock_t *) buf;
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sb = (struct ext2_super_block *) (buf+1024);
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#ifdef WORDS_BIGENDIAN
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if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC))
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ext2fs_swap_super(sb);
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#endif
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if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) &&
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(sb->s_magic == EXT2_SUPER_MAGIC) &&
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ext2fs_has_feature_journal_dev(sb)) {
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blocksize = EXT2_BLOCK_SIZE(sb);
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blocknr = (blocksize == 1024) ? 2 : 1;
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uuid_unparse(sb->s_uuid, jsb_buffer);
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fprintf(out_file, "Ext2 superblock header found.\n");
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if (dump_all) {
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fprintf(out_file, "\tuuid=%s\n", jsb_buffer);
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fprintf(out_file, "\tblocksize=%d\n", blocksize);
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fprintf(out_file, "\tjournal data size %lu\n",
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(unsigned long) ext2fs_blocks_count(sb));
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}
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}
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/* Next, read the journal superblock */
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retval = read_journal_block(cmdname, source,
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((ext2_loff_t) blocknr) * blocksize,
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jsb_buffer, 1024);
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if (retval)
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return;
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if (dump_super) {
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e2p_list_journal_super(out_file, jsb_buffer,
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current_fs->blocksize, 0);
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fputc('\n', out_file);
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}
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jsb = (journal_superblock_t *) jsb_buffer;
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if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) {
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fprintf(out_file,
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"Journal superblock magic number invalid!\n");
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return;
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}
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blocksize = be32_to_cpu(jsb->s_blocksize);
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transaction = be32_to_cpu(jsb->s_sequence);
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blocknr = be32_to_cpu(jsb->s_start);
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fprintf(out_file, "Journal starts at block %u, transaction %u\n",
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blocknr, transaction);
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if (!blocknr) {
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/* Empty journal, nothing to do. */
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if (!dump_old)
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return;
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else
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blocknr = 1;
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}
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while (1) {
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retval = read_journal_block(cmdname, source,
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((ext2_loff_t) blocknr) * blocksize,
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buf, blocksize);
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if (retval)
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return;
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header = (journal_header_t *) buf;
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magic = be32_to_cpu(header->h_magic);
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sequence = be32_to_cpu(header->h_sequence);
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blocktype = be32_to_cpu(header->h_blocktype);
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if (magic != JFS_MAGIC_NUMBER) {
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fprintf (out_file, "No magic number at block %u: "
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"end of journal.\n", blocknr);
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return;
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}
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if (sequence != transaction) {
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fprintf (out_file, "Found sequence %u (not %u) at "
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"block %u: end of journal.\n",
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sequence, transaction, blocknr);
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if (!dump_old)
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return;
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}
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if (dump_descriptors) {
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fprintf (out_file, "Found expected sequence %u, "
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"type %u (%s) at block %u\n",
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sequence, blocktype,
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type_to_name(blocktype), blocknr);
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}
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switch (blocktype) {
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case JFS_DESCRIPTOR_BLOCK:
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dump_descriptor_block(out_file, source, buf, jsb,
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&blocknr, blocksize,
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transaction);
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continue;
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case JFS_COMMIT_BLOCK:
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transaction++;
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blocknr++;
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WRAP(jsb, blocknr);
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continue;
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case JFS_REVOKE_BLOCK:
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dump_revoke_block(out_file, buf, jsb,
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blocknr, blocksize,
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transaction);
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blocknr++;
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WRAP(jsb, blocknr);
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continue;
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default:
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fprintf (out_file, "Unexpected block type %u at "
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"block %u.\n", blocktype, blocknr);
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return;
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}
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}
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}
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static inline size_t journal_super_tag_bytes(journal_superblock_t *jsb)
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{
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size_t sz;
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if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V3))
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return sizeof(journal_block_tag3_t);
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sz = sizeof(journal_block_tag_t);
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if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V2))
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sz += sizeof(__u16);
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if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_64BIT))
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return sz;
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return sz - sizeof(__u32);
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}
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static void dump_descriptor_block(FILE *out_file,
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struct journal_source *source,
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char *buf,
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journal_superblock_t *jsb,
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unsigned int *blockp, int blocksize,
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tid_t transaction)
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{
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int offset, tag_size, csum_size = 0;
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char *tagp;
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journal_block_tag_t *tag;
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unsigned int blocknr;
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__u32 tag_block;
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__u32 tag_flags;
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tag_size = journal_super_tag_bytes(jsb);
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offset = sizeof(journal_header_t);
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blocknr = *blockp;
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if (JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V3) ||
|
|
JSB_HAS_INCOMPAT_FEATURE(jsb, JFS_FEATURE_INCOMPAT_CSUM_V2))
|
|
csum_size = sizeof(struct journal_block_tail);
|
|
|
|
if (dump_all)
|
|
fprintf(out_file, "Dumping descriptor block, sequence %u, at "
|
|
"block %u:\n", transaction, blocknr);
|
|
|
|
++blocknr;
|
|
WRAP(jsb, blocknr);
|
|
|
|
do {
|
|
/* Work out the location of the current tag, and skip to
|
|
* the next one... */
|
|
tagp = &buf[offset];
|
|
tag = (journal_block_tag_t *) tagp;
|
|
offset += tag_size;
|
|
|
|
/* ... and if we have gone too far, then we've reached the
|
|
end of this block. */
|
|
if (offset > blocksize - csum_size)
|
|
break;
|
|
|
|
tag_block = be32_to_cpu(tag->t_blocknr);
|
|
tag_flags = be16_to_cpu(tag->t_flags);
|
|
|
|
if (!(tag_flags & JFS_FLAG_SAME_UUID))
|
|
offset += 16;
|
|
|
|
dump_metadata_block(out_file, source, jsb,
|
|
blocknr, tag_block, tag_flags, blocksize,
|
|
transaction);
|
|
|
|
++blocknr;
|
|
WRAP(jsb, blocknr);
|
|
|
|
} while (!(tag_flags & JFS_FLAG_LAST_TAG));
|
|
|
|
*blockp = blocknr;
|
|
}
|
|
|
|
|
|
static void dump_revoke_block(FILE *out_file, char *buf,
|
|
journal_superblock_t *jsb EXT2FS_ATTR((unused)),
|
|
unsigned int blocknr,
|
|
int blocksize EXT2FS_ATTR((unused)),
|
|
tid_t transaction)
|
|
{
|
|
int offset, max;
|
|
journal_revoke_header_t *header;
|
|
unsigned long long rblock;
|
|
int tag_size = sizeof(__u32);
|
|
|
|
if (dump_all)
|
|
fprintf(out_file, "Dumping revoke block, sequence %u, at "
|
|
"block %u:\n", transaction, blocknr);
|
|
|
|
if (be32_to_cpu(jsb->s_feature_incompat) & JFS_FEATURE_INCOMPAT_64BIT)
|
|
tag_size = sizeof(__u64);
|
|
|
|
header = (journal_revoke_header_t *) buf;
|
|
offset = sizeof(journal_revoke_header_t);
|
|
max = be32_to_cpu(header->r_count);
|
|
|
|
while (offset < max) {
|
|
if (tag_size == sizeof(__u32)) {
|
|
__u32 *entry = (__u32 *) (buf + offset);
|
|
rblock = be32_to_cpu(*entry);
|
|
} else {
|
|
__u64 *entry = (__u64 *) (buf + offset);
|
|
rblock = ext2fs_be64_to_cpu(*entry);
|
|
}
|
|
if (dump_all || rblock == block_to_dump) {
|
|
fprintf(out_file, " Revoke FS block %llu", rblock);
|
|
if (dump_all)
|
|
fprintf(out_file, "\n");
|
|
else
|
|
fprintf(out_file," at block %u, sequence %u\n",
|
|
blocknr, transaction);
|
|
}
|
|
offset += tag_size;
|
|
}
|
|
}
|
|
|
|
|
|
static void show_extent(FILE *out_file, int start_extent, int end_extent,
|
|
__u32 first_block)
|
|
{
|
|
if (start_extent >= 0 && first_block != 0)
|
|
fprintf(out_file, "(%d+%u): %u ",
|
|
start_extent, end_extent-start_extent, first_block);
|
|
}
|
|
|
|
static void show_indirect(FILE *out_file, const char *name, __u32 where)
|
|
{
|
|
if (where)
|
|
fprintf(out_file, "(%s): %u ", name, where);
|
|
}
|
|
|
|
|
|
static void dump_metadata_block(FILE *out_file, struct journal_source *source,
|
|
journal_superblock_t *jsb EXT2FS_ATTR((unused)),
|
|
unsigned int log_blocknr,
|
|
unsigned int fs_blocknr,
|
|
unsigned int log_tag_flags,
|
|
int blocksize,
|
|
tid_t transaction)
|
|
{
|
|
int retval;
|
|
char buf[8192];
|
|
|
|
if (!(dump_all
|
|
|| (fs_blocknr == block_to_dump)
|
|
|| (fs_blocknr == inode_block_to_dump)
|
|
|| (fs_blocknr == bitmap_to_dump)))
|
|
return;
|
|
|
|
fprintf(out_file, " FS block %u logged at ", fs_blocknr);
|
|
if (!dump_all)
|
|
fprintf(out_file, "sequence %u, ", transaction);
|
|
fprintf(out_file, "journal block %u (flags 0x%x)\n", log_blocknr,
|
|
log_tag_flags);
|
|
|
|
/* There are two major special cases to parse:
|
|
*
|
|
* If this block is a block
|
|
* bitmap block, we need to give it special treatment so that we
|
|
* can log any allocates and deallocates which affect the
|
|
* block_to_dump query block.
|
|
*
|
|
* If the block is an inode block for the inode being searched
|
|
* for, then we need to dump the contents of that inode
|
|
* structure symbolically.
|
|
*/
|
|
|
|
if (!(dump_contents && dump_all)
|
|
&& fs_blocknr != block_to_dump
|
|
&& fs_blocknr != bitmap_to_dump
|
|
&& fs_blocknr != inode_block_to_dump)
|
|
return;
|
|
|
|
retval = read_journal_block("logdump", source,
|
|
((ext2_loff_t) log_blocknr) * blocksize,
|
|
buf, blocksize);
|
|
if (retval)
|
|
return;
|
|
|
|
if (fs_blocknr == bitmap_to_dump) {
|
|
struct ext2_super_block *super;
|
|
int offset;
|
|
|
|
super = current_fs->super;
|
|
offset = ((block_to_dump - super->s_first_data_block) %
|
|
super->s_blocks_per_group);
|
|
|
|
fprintf(out_file, " (block bitmap for block %llu: "
|
|
"block is %s)\n",
|
|
block_to_dump,
|
|
ext2fs_test_bit(offset, buf) ? "SET" : "CLEAR");
|
|
}
|
|
|
|
if (fs_blocknr == inode_block_to_dump) {
|
|
struct ext2_inode *inode;
|
|
int first, prev, this, start_extent, i;
|
|
|
|
fprintf(out_file, " (inode block for inode %u):\n",
|
|
inode_to_dump);
|
|
|
|
inode = (struct ext2_inode *) (buf + inode_offset_to_dump);
|
|
internal_dump_inode(out_file, " ", inode_to_dump, inode, 0);
|
|
|
|
/* Dump out the direct/indirect blocks here:
|
|
* internal_dump_inode can only dump them from the main
|
|
* on-disk inode, not from the journaled copy of the
|
|
* inode. */
|
|
|
|
fprintf (out_file, " Blocks: ");
|
|
first = prev = start_extent = -1;
|
|
|
|
for (i=0; i<EXT2_NDIR_BLOCKS; i++) {
|
|
this = inode->i_block[i];
|
|
if (start_extent >= 0 && this == prev+1) {
|
|
prev = this;
|
|
continue;
|
|
} else {
|
|
show_extent(out_file, start_extent, i, first);
|
|
start_extent = i;
|
|
first = prev = this;
|
|
}
|
|
}
|
|
show_extent(out_file, start_extent, i, first);
|
|
show_indirect(out_file, "IND", inode->i_block[i++]);
|
|
show_indirect(out_file, "DIND", inode->i_block[i++]);
|
|
show_indirect(out_file, "TIND", inode->i_block[i++]);
|
|
|
|
fprintf(out_file, "\n");
|
|
}
|
|
|
|
if (dump_contents)
|
|
do_hexdump(out_file, buf, blocksize);
|
|
|
|
}
|
|
|
|
static void do_hexdump (FILE *out_file, char *buf, int blocksize)
|
|
{
|
|
int i,j;
|
|
int *intp;
|
|
char *charp;
|
|
unsigned char c;
|
|
|
|
intp = (int *) buf;
|
|
charp = (char *) buf;
|
|
|
|
for (i=0; i<blocksize; i+=16) {
|
|
fprintf(out_file, " %04x: ", i);
|
|
for (j=0; j<16; j+=4)
|
|
fprintf(out_file, "%08x ", *intp++);
|
|
for (j=0; j<16; j++) {
|
|
c = *charp++;
|
|
if (c < ' ' || c >= 127)
|
|
c = '.';
|
|
fprintf(out_file, "%c", c);
|
|
}
|
|
fprintf(out_file, "\n");
|
|
}
|
|
}
|
|
|