btrfs: raid56: convert kmaps to kmap_local_page

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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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Ira Weiny 2021-02-16 18:48:24 -08:00 • committed by David Sterba

parent 58c1a35cd5

commit 94a0b58d2d

1 changed files with 34 additions and 31 deletions

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fs/btrfs/raid56.c

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