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Date: Mon, 04 Aug 2014 18:06:55 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 18/21] e2fsck: check inline dir size is a multiple of 4
Directory entries must have a size that's a multiple of 4; therefore
the inline directory structure must also have a size that is a muliple
of 4. Since e2fsck doesn't check this, we should check that now.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
e2fsck/pass2.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
e2fsck/problem.c | 10 ++++++++
e2fsck/problem.h | 6 +++++
3 files changed, 80 insertions(+)
diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
index abf95bd..ed2c4d7 100644
--- a/e2fsck/pass2.c
+++ b/e2fsck/pass2.c
@@ -772,6 +772,59 @@ static errcode_t insert_dirent_tail(ext2_filsys fs, void *dirbuf)
}
#undef NEXT_DIRENT
+static errcode_t fix_inline_dir_size(e2fsck_t ctx, ext2_ino_t ino,
+ size_t *inline_data_size,
+ struct problem_context *pctx,
+ char *buf)
+{
+ ext2_filsys fs = ctx->fs;
+ struct ext2_inode inode;
+ size_t new_size, old_size;
+ errcode_t retval;
+
+ old_size = *inline_data_size;
+ new_size = old_size + (4 - (old_size & 3));
+ memset(buf + old_size, 0, new_size - old_size);
+ retval = ext2fs_inline_data_set(fs, ino, 0, buf, new_size);
+ if (retval == EXT2_ET_INLINE_DATA_NO_SPACE) {
+ new_size -= 4;
+ retval = ext2fs_inline_data_set(fs, ino, 0, buf, new_size);
+ if (retval) {
+ if (fix_problem(ctx, PR_2_FIX_INLINE_DIR_FAILED,
+ pctx)) {
+ new_size = 0;
+ goto write_inode;
+ }
+ goto err;
+ }
+ } else if (retval) {
+ if (fix_problem(ctx, PR_2_FIX_INLINE_DIR_FAILED,
+ pctx)) {
+ new_size = 0;
+ goto write_inode;
+ }
+ goto err;
+ }
+
+write_inode:
+ retval = ext2fs_read_inode(fs, ino, &inode);
+ if (retval)
+ goto err;
+
+ retval = ext2fs_inode_size_set(fs, &inode, new_size);
+ if (retval)
+ goto err;
+ if (new_size == 0)
+ inode.i_flags &= ~EXT4_INLINE_DATA_FL;
+ retval = ext2fs_write_inode(fs, ino, &inode);
+ if (retval)
+ goto err;
+ *inline_data_size = new_size;
+
+err:
+ return retval;
+}
+
static int check_dir_block(ext2_filsys fs,
struct ext2_db_entry2 *db,
void *priv_data)
@@ -885,6 +938,17 @@ static int check_dir_block(ext2_filsys fs,
cd->pctx.errcode = ext2fs_read_dir_block4(fs, block_nr,
buf, 0, ino);
inline_read_fail:
+ pctx.ino = ino;
+ pctx.num = inline_data_size;
+ if ((inline_data_size & 3) &&
+ fix_problem(ctx, PR_2_BAD_INLINE_DIR_SIZE, &pctx)) {
+ errcode_t err = fix_inline_dir_size(ctx, ino,
+ &inline_data_size, &pctx,
+ buf);
+ if (err)
+ return DIRENT_ABORT;
+
+ }
ehandler_operation(0);
if (cd->pctx.errcode == EXT2_ET_DIR_CORRUPTED)
cd->pctx.errcode = 0; /* We'll handle this ourselves */
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 4245244..4f975e5 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -1523,6 +1523,16 @@ static struct e2fsck_problem problem_table[] = {
N_("@d @i %i, %B, offset %N: @d passes checks but fails checksum.\n"),
PROMPT_FIX, PR_PREEN_OK },
+ /* inline directory inode size must be a multiple of 4 */
+ { PR_2_BAD_INLINE_DIR_SIZE,
+ N_("Inline @d @i %i size (%N) must be a multiple of 4.\n"),
+ PROMPT_FIX, 0 },
+
+ /* fixing size of inline directory inode failed */
+ { PR_2_FIX_INLINE_DIR_FAILED,
+ N_("Fixing size of inline @d @i %i failed.\n"),
+ PROMPT_TRUNCATE, 0 },
+
/* Pass 3 errors */
/* Pass 3: Checking directory connectivity */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index 22c86c5..e901c8e 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -906,6 +906,12 @@ struct problem_context {
/* dir leaf node passes checks, but fails checksum */
#define PR_2_LEAF_NODE_ONLY_CSUM_INVALID 0x02004D
+/* bad inline directory size */
+#define PR_2_BAD_INLINE_DIR_SIZE 0x02004E
+
+/* fixing inline dir size failed */
+#define PR_2_FIX_INLINE_DIR_FAILED 0x02004F
+
/*
* Pass 3 errors
*/
--
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