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| author | Qu Wenruo <wqu@suse.com> | 2020-10-21 14:24:50 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2020-12-08 15:53:53 +0100 |
| commit | 03509b781ae98d4cf5cc139f89a3e75467b829a8 (patch) | |
| tree | b21063d354fd7e15cb1b4d47f92209f96cbb1317 | |
| parent | a3efb2f0bad55330bc2402734220ef5446ef1f19 (diff) | |
btrfs: update the comment for find_first_extent_bit
The pitfall here is, if the parameter @bits has multiple bits set, we
will return the first range which just has one of the specified bits
set.
This is a little tricky if we want an exact match. Anyway, update the
comment to make that clear.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index a268cc6923e0..539dab345d24 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1554,11 +1554,12 @@ out: } /* - * find the first offset in the io tree with 'bits' set. zero is - * returned if we find something, and *start_ret and *end_ret are - * set to reflect the state struct that was found. + * Find the first offset in the io tree with one or more @bits set. * - * If nothing was found, 1 is returned. If found something, return 0. + * Note: If there are multiple bits set in @bits, any of them will match. + * + * Return 0 if we find something, and update @start_ret and @end_ret. + * Return 1 if we found nothing. */ int find_first_extent_bit(struct extent_io_tree *tree, u64 start, u64 *start_ret, u64 *end_ret, unsigned bits, |