btrfs: raid56: convert kmaps to kmap_local_page
These kmaps are thread local and don't need to be atomic. So they can use the more efficient kmap_local_page(). However, the mapping of pages in the stripes and the additional parity and qstripe pages are a bit trickier because the unmapping must occur in the opposite order from the mapping. Furthermore, the pointer array in __raid_recover_end_io() may get reordered. Convert these calls to kmap_local_page() taking care to reverse the unmappings of any page arrays as well as being careful with the mappings of any special pages such as the parity and qstripe pages. Signed-off-by:Ira Weiny <ira.weiny@intel.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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58c1a35c
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