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/*
* e2fsck.c - superblock checks
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Public
* License.
* %End-Header%
*/
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <time.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <unistd.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_MNTENT_H
#include <mntent.h>
#endif
#ifndef EXT2_SKIP_UUID
#include "uuid/uuid.h"
#endif
#include "e2fsck.h"
#include "problem.h"
#define MIN_CHECK 1
#define MAX_CHECK 2
static void check_super_value(e2fsck_t ctx, const char *descr,
unsigned long value, int flags,
unsigned long min, unsigned long max)
{
struct problem_context pctx;
if (((flags & MIN_CHECK) && (value < min)) ||
((flags & MAX_CHECK) && (value > max))) {
clear_problem_context(&pctx);
pctx.num = value;
pctx.str = descr;
fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx);
ctx->flags |= E2F_FLAG_ABORT; /* never get here! */
}
}
/*
* This routine may get stubbed out in special compilations of the
* e2fsck code..
*/
#ifndef EXT2_SPECIAL_DEVICE_SIZE
errcode_t e2fsck_get_device_size(e2fsck_t ctx)
{
return (ext2fs_get_device_size(ctx->filesystem_name,
EXT2_BLOCK_SIZE(ctx->fs->super),
&ctx->num_blocks));
}
#endif
void check_super_block(e2fsck_t ctx)
{
ext2_filsys fs = ctx->fs;
blk_t first_block, last_block;
struct ext2fs_sb *s = (struct ext2fs_sb *) fs->super;
blk_t blocks_per_group = fs->super->s_blocks_per_group;
int i;
blk_t should_be;
struct problem_context pctx;
ctx->invalid_inode_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
sizeof(int) * fs->group_desc_count, "invalid_inode_bitmap");
ctx->invalid_block_bitmap_flag = (int *) e2fsck_allocate_memory(ctx,
sizeof(int) * fs->group_desc_count, "invalid_block_bitmap");
ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx,
sizeof(int) * fs->group_desc_count, "invalid_inode_table");
clear_problem_context(&pctx);
/*
* Verify the super block constants...
*/
check_super_value(ctx, "inodes_count", s->s_inodes_count,
MIN_CHECK, 1, 0);
check_super_value(ctx, "blocks_count", s->s_blocks_count,
MIN_CHECK, 1, 0);
check_super_value(ctx, "first_data_block", s->s_first_data_block,
MAX_CHECK, 0, s->s_blocks_count);
check_super_value(ctx, "log_frag_size", s->s_log_frag_size,
MAX_CHECK, 0, 2);
check_super_value(ctx, "log_block_size", s->s_log_block_size,
MIN_CHECK | MAX_CHECK, s->s_log_frag_size,
2);
check_super_value(ctx, "frags_per_group", s->s_frags_per_group,
MIN_CHECK | MAX_CHECK, 1, 8 * EXT2_BLOCK_SIZE(s));
check_super_value(ctx, "blocks_per_group", s->s_blocks_per_group,
MIN_CHECK | MAX_CHECK, 1, 8 * EXT2_BLOCK_SIZE(s));
check_super_value(ctx, "inodes_per_group", s->s_inodes_per_group,
MIN_CHECK, 1, 0);
check_super_value(ctx, "r_blocks_count", s->s_r_blocks_count,
MAX_CHECK, 0, s->s_blocks_count);
if (!ctx->num_blocks) {
pctx.errcode = e2fsck_get_device_size(ctx);
if (pctx.errcode && pctx.errcode != EXT2_ET_UNIMPLEMENTED) {
fix_problem(ctx, PR_0_GETSIZE_ERROR, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
if ((pctx.errcode != EXT2_ET_UNIMPLEMENTED) &&
(ctx->num_blocks < s->s_blocks_count)) {
pctx.blk = s->s_blocks_count;
pctx.blk2 = ctx->num_blocks;
if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) {
ctx->flags |= E2F_FLAG_ABORT;
return;
}
}
}
if (s->s_log_block_size != s->s_log_frag_size) {
pctx.blk = EXT2_BLOCK_SIZE(s);
pctx.blk2 = EXT2_FRAG_SIZE(s);
fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
should_be = s->s_frags_per_group >>
(s->s_log_block_size - s->s_log_frag_size);
if (s->s_blocks_per_group != should_be) {
pctx.blk = s->s_blocks_per_group;
pctx.blk2 = should_be;
fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
should_be = (s->s_log_block_size == 0) ? 1 : 0;
if (s->s_first_data_block != should_be) {
pctx.blk = s->s_first_data_block;
pctx.blk2 = should_be;
fix_problem(ctx, PR_0_FIRST_DATA_BLOCK, &pctx);
ctx->flags |= E2F_FLAG_ABORT;
return;
}
/*
* Verify the group descriptors....
*/
first_block = fs->super->s_first_data_block;
last_block = first_block + blocks_per_group;
for (i = 0; i < fs->group_desc_count; i++) {
pctx.group = i;
if (i == fs->group_desc_count - 1)
last_block = fs->super->s_blocks_count;
if ((fs->group_desc[i].bg_block_bitmap < first_block) ||
(fs->group_desc[i].bg_block_bitmap >= last_block)) {
pctx.blk = fs->group_desc[i].bg_block_bitmap;
if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx)) {
fs->group_desc[i].bg_block_bitmap = 0;
ctx->invalid_block_bitmap_flag[i]++;
ctx->invalid_bitmaps++;
}
}
if ((fs->group_desc[i].bg_inode_bitmap < first_block) ||
(fs->group_desc[i].bg_inode_bitmap >= last_block)) {
pctx.blk = fs->group_desc[i].bg_inode_bitmap;
if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx)) {
fs->group_desc[i].bg_inode_bitmap = 0;
ctx->invalid_inode_bitmap_flag[i]++;
ctx->invalid_bitmaps++;
}
}
if ((fs->group_desc[i].bg_inode_table < first_block) ||
((fs->group_desc[i].bg_inode_table +
fs->inode_blocks_per_group - 1) >= last_block)) {
pctx.blk = fs->group_desc[i].bg_inode_table;
if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx)) {
fs->group_desc[i].bg_inode_table = 0;
ctx->invalid_inode_table_flag[i]++;
ctx->invalid_bitmaps++;
}
}
first_block += fs->super->s_blocks_per_group;
last_block += fs->super->s_blocks_per_group;
}
/*
* If we have invalid bitmaps, set the error state of the
* filesystem.
*/
if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) {
fs->super->s_state &= ~EXT2_VALID_FS;
ext2fs_mark_super_dirty(fs);
}
#ifndef EXT2_SKIP_UUID
/*
* If the UUID field isn't assigned, assign it.
*/
if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(s->s_uuid)) {
clear_problem_context(&pctx);
if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) {
uuid_generate(s->s_uuid);
ext2fs_mark_super_dirty(fs);
}
}
#endif
return;
}
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