btrfs: add comments for btrfs_check_can_nocow() and can_nocow_extent()

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These two functions have extra conditions that their callers need to
meet, and some not-that-common parameters used for return value.

So adding some comments may save reviewers some time.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Qu Wenruo 2020-06-24 07:23:51 +08:00 • committed by David Sterba

parent 6d4572a9d7

commit e4ecaf90bc

2 changed files with 40 additions and 2 deletions

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21

fs/btrfs/file.c

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21

fs/btrfs/inode.c

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