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btrfs: update the comment for find_first_extent_bit

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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>
This commit is contained in:
Qu Wenruo
2020-10-21 14:24:50 +08:00
committed by David Sterba
parent a3efb2f0ba
commit 03509b781a
1 changed files with 5 additions and 4 deletions
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9
fs/btrfs/extent_io.c
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@ -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,