ocfs2: Validate metadata only when it's read from disk.
Add an optional validation hook to ocfs2_read_blocks(). Now the
validation function is only called when a block was actually read off of
disk. It is not called when the buffer was in cache.
We add a buffer state bit BH_NeedsValidate to flag these buffers. It
must always be one higher than the last JBD2 buffer state bit.
The dinode, dirblock, extent_block, and xattr_block validators are
lifted to this scheme directly. The group_descriptor validator needs to
be split into two pieces. The first part only needs the gd buffer and
is passed to ocfs2_read_block(). The second part requires the dinode as
well, and is called every time. It's only 3 compares, so it's tiny.
This also allows us to clean up the non-fatal gd check used by resize.c.
It now has no magic argument.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index f430cc6..e823a27 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -684,6 +684,9 @@
struct ocfs2_extent_block *eb =
(struct ocfs2_extent_block *)bh->b_data;
+ mlog(0, "Validating extent block %llu\n",
+ (unsigned long long)bh->b_blocknr);
+
if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
ocfs2_error(sb,
"Extent block #%llu has bad signature %.*s",
@@ -719,21 +722,13 @@
int rc;
struct buffer_head *tmp = *bh;
- rc = ocfs2_read_block(inode, eb_blkno, &tmp);
- if (rc)
- goto out;
-
- rc = ocfs2_validate_extent_block(inode->i_sb, tmp);
- if (rc) {
- brelse(tmp);
- goto out;
- }
+ rc = ocfs2_read_block(inode, eb_blkno, &tmp,
+ ocfs2_validate_extent_block);
/* If ocfs2_read_block() got us a new bh, pass it up. */
- if (!*bh)
+ if (!rc && !*bh)
*bh = tmp;
-out:
return rc;
}