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Chris Mason 3b951516ed Btrfs: Use the extent map cache to find the logical disk block during data retries ... The data read retry code needs to find the logical disk block before it can resubmit new bios. But, finding this block isn't allowed to take the fs_mutex because that will deadlock with a number of different callers. This changes the retry code to use the extent map cache instead, but that requires the extent map cache to have the extent we're looking for. This is a problem because btrfs_drop_extent_cache just drops the entire extent instead of the little tiny part it is invalidating. The bulk of the code in this patch changes btrfs_drop_extent_cache to invalidate only a portion of the extent cache, and changes btrfs_get_extent to deal with the results. Signed-off-by: Chris Mason <chris.mason@oracle.com>		2008-09-25 11:04:01 -04:00
fs/btrfs	Btrfs: Use the extent map cache to find the logical disk block during data retries	2008-09-25 11:04:01 -04:00