btrfs: document existence of extent_io ops callbacks

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Some of the callbacks defined in btree_extent_io_ops and
btrfs_extent_io_ops do always exist so we don't need to check the
existence before each call. This patch just reorders the definition and
documents which are mandatory/optional.

Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2017-02-17 15:27:44 +01:00

parent c3988d630a

commit 4d53dddbec

3 changed files with 26 additions and 11 deletions

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7

fs/btrfs/disk-io.c

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25

fs/btrfs/extent_io.h

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7

fs/btrfs/inode.c

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