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Re: REVIEW: xfs_repair fixes for bad directories

To: Barry Naujok <bnaujok@xxxxxxx>
Subject: Re: REVIEW: xfs_repair fixes for bad directories
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 1 Jul 2008 04:13:06 -0400
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <op.udlsirmx3jf8g2@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <op.udlsirmx3jf8g2@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
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On Tue, Jul 01, 2008 at 06:00:17PM +1000, Barry Naujok wrote:
> Two issues have been encounted with xfs_repair and badly corrupted
> directories.
>
> 1. A huge size (inode di_size) can cause malloc which will fail.
>    Patch dir_size_check.patch checks for a valid directory size
>    and if it's bad, junks the directory. The di_size for a dir
>    only counts the data blocks being used, not all the other
>    associated metadata. This is limited to 32GB by the
>    XFS_DIR2_LEAF_OFFSET value in XFS. Anything greater than this
>    must be invalid.

This one looks good.

> 2. An update a while ago to xfs_repair attempts to fix invalid
>    ".." entries for subdirectories where there is a valid parent
>    with the appropriate entry. It was a partial fix that never
>    did the full job, especially if the subdirectory was short-
>    form or it has already been processed.
>
>    Patch fix_dir_rebuild_without_dotdot_entry.patch creates a
>    post-processing queue after the main scan to update any
>    directories with an invalid ".." entry.

For this one I'll need to read the surrounding code first to do
a useful review, so it'll take some time.


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