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e2fsck: Detect unordered extents in an extent node

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The logical block numbers must be monotonically increasing, and there
must not be any overlapping extents.  If any are found, report them as
filesystem corruption.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2008-06-02 20:12:34 -04:00
parent 16bd349e1f
commit d5a8f9a9f2
3 changed files with 15 additions and 4 deletions
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11
e2fsck/pass1.c
View File

@ -1613,7 +1613,8 @@ void e2fsck_clear_inode(e2fsck_t ctx, ext2_ino_t ino,
}
static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
struct process_block_struct *pb,
struct process_block_struct *pb,
blk64_t start_block,
ext2_extent_handle_t ehandle)
{
struct ext2fs_extent extent;
@ -1638,6 +1639,8 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
if (extent.e_pblk < ctx->fs->super->s_first_data_block ||
extent.e_pblk >= ctx->fs->super->s_blocks_count)
problem = PR_1_EXTENT_BAD_START_BLK;
else if (extent.e_lblk < start_block)
problem = PR_1_OUT_OF_ORDER_EXTENTS;
else if (is_leaf &&
(extent.e_pblk + extent.e_len) >
ctx->fs->super->s_blocks_count)
@ -1680,7 +1683,7 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
error_message(pctx->errcode), pctx->ino);
abort();
}
scan_extent_node(ctx, pctx, pb, ehandle);
scan_extent_node(ctx, pctx, pb, extent.e_lblk, ehandle);
pctx->errcode = ext2fs_extent_get(ehandle,
EXT2_EXTENT_UP, &extent);
if (pctx->errcode) {
@ -1709,7 +1712,7 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
}
}
pb->num_blocks += extent.e_len;
pb->last_block = extent.e_lblk + extent.e_len - 1;
start_block = pb->last_block = extent.e_lblk + extent.e_len - 1;
next:
pctx->errcode = ext2fs_extent_get(ehandle,
EXT2_EXTENT_NEXT_SIB,
@ -1736,7 +1739,7 @@ static void check_blocks_extents(e2fsck_t ctx, struct problem_context *pctx,
return;
}
scan_extent_node(ctx, pctx, pb, ehandle);
scan_extent_node(ctx, pctx, pb, 0, ehandle);
ext2fs_extent_free(ehandle);
}

5
e2fsck/problem.c
View File

@ -849,6 +849,11 @@ static struct e2fsck_problem problem_table[] = {
N_("Fast symlink %i has EXTENT_FL set. "),
PROMPT_CLEAR, 0 },
/* Extents are out of order */
{ PR_1_OUT_OF_ORDER_EXTENTS,
N_("@i %i has out of order extents\n\t(@n logical @b %c, physical @b %b, len %N)\n"),
PROMPT_CLEAR, 0 },
/* Pass 1b errors */
/* Pass 1B: Rescan for duplicate/bad blocks */

3
e2fsck/problem.h
View File

@ -494,6 +494,9 @@ struct problem_context {
/* Fast symlink has EXTENTS_FL set */
#define PR_1_FAST_SYMLINK_EXTENT_FL 0x01005D
/* Extents are out of order */
#define PR_1_OUT_OF_ORDER_EXTENTS 0x01005E
/*
* Pass 1b errors
*/