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Message-Id: <1356047023-28367-1-git-send-email-tytso@mit.edu>
Date: Thu, 20 Dec 2012 18:43:41 -0500
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: forrestl@...ology.com, Eric Sandeen <sandeen@...hat.com>,
"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 1/3] e2fsck: fix incorrect interior node logical start values
From: Eric Sandeen <sandeen@...hat.com>
An index node's logical start (ei_block) should
match the logical start of the first node (index
or leaf) below it. If we find a node whose start
does not match its parent, fix all of its parents
accordingly.
If it finds such a problem, we'll see:
Pass 1: Checking inodes, blocks, and sizes
Interior extent node level 0 of inode 274258:
Logical start 3666 does not match logical start 4093 at next level. Fix<y>?
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
e2fsck/pass1.c | 17 ++++++++++++++++-
e2fsck/problem.c | 8 ++++++++
e2fsck/problem.h | 4 +++-
lib/ext2fs/ext2fs.h | 1 +
lib/ext2fs/extent.c | 2 +-
5 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index cc00e0f..2acbb53 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -1797,7 +1797,7 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
problem = PR_1_EXTENT_ENDS_BEYOND;
if (problem) {
- report_problem:
+report_problem:
pctx->blk = extent.e_pblk;
pctx->blk2 = extent.e_lblk;
pctx->num = extent.e_len;
@@ -1822,7 +1822,10 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
}
if (!is_leaf) {
+ blk64_t lblk;
+
blk = extent.e_pblk;
+ lblk = extent.e_lblk;
pctx->errcode = ext2fs_extent_get(ehandle,
EXT2_EXTENT_DOWN, &extent);
if (pctx->errcode) {
@@ -1832,6 +1835,18 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
goto report_problem;
return;
}
+ /* The next extent should match this index's logical start */
+ if (extent.e_lblk != lblk) {
+ struct ext2_extent_info info;
+
+ ext2fs_extent_get_info(ehandle, &info);
+ pctx->blk = lblk;
+ pctx->blk2 = extent.e_lblk;
+ pctx->num = info.curr_level - 1;
+ problem = PR_1_EXTENT_INDEX_START_INVALID;
+ if (fix_problem(ctx, problem, pctx))
+ ext2fs_extent_fix_parents(ehandle);
+ }
scan_extent_node(ctx, pctx, pb, extent.e_lblk, ehandle);
if (pctx->errcode)
return;
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 977a4c8..ab67cff 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -946,6 +946,14 @@ static struct e2fsck_problem problem_table[] = {
N_("@i %i has zero length extent\n\t(@n logical @b %c, physical @b %b)\n"),
PROMPT_CLEAR, 0 },
+ /*
+ * Interior extent node logical offset doesn't match first node below it
+ */
+ { PR_1_EXTENT_INDEX_START_INVALID,
+ N_("Interior @x node level %N of @i %i:\n"
+ "Logical start %b does not match logical start %c at next level. "),
+ PROMPT_FIX, 0 },
+
/* Pass 1b errors */
/* Pass 1B: Rescan for duplicate/bad blocks */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index 1b5815b..aed524d 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -558,6 +558,9 @@ struct problem_context {
/* Extent has zero length */
#define PR_1_EXTENT_LENGTH_ZERO 0x010066
+/* Index start doesn't match start of next extent down */
+#define PR_1_EXTENT_INDEX_START_INVALID 0x01006D
+
/*
* Pass 1b errors
*/
@@ -586,7 +589,6 @@ struct problem_context {
/* Error adjusting EA refcount */
#define PR_1B_ADJ_EA_REFCOUNT 0x011007
-
/* Pass 1C: Scan directories for inodes with dup blocks. */
#define PR_1C_PASS_HEADER 0x012000
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 7a14f40..1b35ff7 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1082,6 +1082,7 @@ extern errcode_t ext2fs_extent_get_info(ext2_extent_handle_t handle,
struct ext2_extent_info *info);
extern errcode_t ext2fs_extent_goto(ext2_extent_handle_t handle,
blk64_t blk);
+extern errcode_t ext2fs_extent_fix_parents(ext2_extent_handle_t handle);
/* fileio.c */
extern errcode_t ext2fs_file_open2(ext2_filsys fs, ext2_ino_t ino,
diff --git a/lib/ext2fs/extent.c b/lib/ext2fs/extent.c
index 8828764..95a0a86 100644
--- a/lib/ext2fs/extent.c
+++ b/lib/ext2fs/extent.c
@@ -706,7 +706,7 @@ errcode_t ext2fs_extent_goto(ext2_extent_handle_t handle,
* Safe to call for any position in node; if not at the first entry,
* will simply return.
*/
-static errcode_t ext2fs_extent_fix_parents(ext2_extent_handle_t handle)
+errcode_t ext2fs_extent_fix_parents(ext2_extent_handle_t handle)
{
int retval = 0;
blk64_t start;
--
1.7.12.rc0.22.gcdd159b
--
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