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ocfs2: Validate metadata only when it's read from disk.

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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>
This commit is contained in:
Joel Becker
2008-11-13 14:49:19 -08:00
committed by Mark Fasheh
parent 4ae1d69bed
commit 970e4936d7
10 changed files with 149 additions and 97 deletions
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13
fs/ocfs2/dir.c
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@@ -214,6 +214,8 @@ static int ocfs2_validate_dir_block(struct super_block *sb,
* Nothing yet. We don't validate dirents here, that's handled
* in-place when the code walks them.
*/
mlog(0, "Validating dirblock %llu\n",
(unsigned long long)bh->b_blocknr);
return 0;
}
@@ -255,20 +257,13 @@ static int ocfs2_read_dir_block(struct inode *inode, u64 v_block,
goto out;
}
rc = ocfs2_read_blocks(inode, p_blkno, 1, &tmp, flags);
rc = ocfs2_read_blocks(inode, p_blkno, 1, &tmp, flags,
ocfs2_validate_dir_block);
if (rc) {
mlog_errno(rc);
goto out;
}
if (!(flags & OCFS2_BH_READAHEAD)) {
rc = ocfs2_validate_dir_block(inode->i_sb, tmp);
if (rc) {
brelse(tmp);
goto out;
}
}
/* If ocfs2_read_blocks() got us a new bh, pass it up. */
if (!*bh)
*bh = tmp;