Re: [PATCH] xfs: set format back to extents if xfs_bmap_extents_to_btree fails

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On Mon, Apr 16, 2018 at 11:26:12PM -0500, Eric Sandeen wrote:
> If xfs_bmap_extents_to_btree fails in a mode where we call
> xfs_iroot_realloc(-1) to de-allocate the root, set the
> format back to extents.
> 
> Otherwise we can assume we can dereference ifp->if_broot
> based on the XFS_DINODE_FMT_BTREE format, and crash.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199423
> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>

Looks good,

Reviewed-by: Christoph Hellwig <hch@xxxxxx>
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