tree 74882dd6bcf9a2fe6f3d0eeb1fdccf27d8fb57fc
parent 978b63f7464abcfd364a6c95f734282c50f3decf
author Filipe Manana <fdmanana@suse.com> 1709130993 +0000
committer David Sterba <dsterba@suse.com> 1709658859 +0100

btrfs: reuse cloned extent buffer during fiemap to avoid re-allocations

During fiemap we may have to visit multiple leaves of the subvolume's
inode tree, and each time we are freeing and allocating an extent buffer
to use as a clone of each visited leaf. Optimize this by reusing cloned
extent buffers, to avoid the freeing and re-allocation both of the extent
buffer structure itself and more importantly of the pages attached to the
extent buffer.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>