btrfs: fiemap: preallocate ulists for btrfs_check_shared

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btrfs_check_shared looks up parents of a given extent and uses ulists
for that. These are allocated and freed repeatedly. Preallocation in the
caller will avoid the overhead and also allow us to use the GFP_KERNEL
as it is happens before the extent locks are taken.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2019-05-15 15:31:04 +02:00

parent 9b4e675a99

commit 5911c8fe05

3 changed files with 23 additions and 14 deletions

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17

fs/btrfs/backref.c

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3

fs/btrfs/backref.h

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17

fs/btrfs/extent_io.c

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