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@xxxxxxxxxx>
---
p.s. this works for me, but I am emphatically not an e2fsck
guru. Please do review. :)
I'm not sure if this should trigger re-traversal of the
entire extent tree after the fixup?
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index a4bd956..7ff4021 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -1901,7 +1901,7 @@ static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
}
if (problem) {
- report_problem:
+report_problem:
pctx->blk = extent.e_pblk;
pctx->blk2 = extent.e_lblk;
pctx->num = extent.e_len;
@@ -1927,7 +1927,10 @@ fix_problem_now:
}
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) {
@@ -1940,6 +1943,18 @@ fix_problem_now:
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 78b05bb..9d4cd5f 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -1000,6 +1000,14 @@ static struct e2fsck_problem problem_table[] = {
"@i %i does not match. "),
PROMPT_FIX, 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 5caade4..a57b104 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -586,6 +586,8 @@ struct problem_context {
/* ea block passes checks, but checksum invalid */
#define PR_1_EA_BLOCK_ONLY_CSUM_INVALID 0x01006C
+/* Index start doesn't match start of next extent down */
+#define PR_1_EXTENT_INDEX_START_INVALID 0x01006D
/*
* Pass 1b errors
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 9148d4e..ccd0936 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1157,6 +1157,7 @@ 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 da82a2a..8c3b7b9 100644
--- a/lib/ext2fs/extent.c
+++ b/lib/ext2fs/extent.c
@@ -722,7 +722,7 @@ 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;
--
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