btrfs: zoned: fix wrong use of bitops API in btrfs_ensure_empty_zones

commit 631003e2333c12cc1b52df06a707365b7363a159 upstream.

find_next_bit and find_next_zero_bit take @size as the second parameter and
@offset as the third parameter. They are specified opposite in
btrfs_ensure_empty_zones(). Thanks to the later loop, it never failed to
detect the empty zones. Fix them and (maybe) return the result a bit
faster.

Note: the naming is a bit confusing, size has two meanings here, bitmap
and our range size.

Fixes: 1cd6121f2a38 ("btrfs: zoned: implement zoned chunk allocator")
CC: stable@vger.kernel.org # 5.15+
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index ce5ebba7fdd9a67dbc46a0adcf3cfd635f7689a6..6d14d876cf57b0b5bf761dfca0a32e4b29d27e45 100644 (file)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1164,12 +1164,12 @@ int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
                return -ERANGE;
 
        /* All the zones are conventional */
-       if (find_next_bit(zinfo->seq_zones, begin, end) == end)
+       if (find_next_bit(zinfo->seq_zones, end, begin) == end)
                return 0;
 
        /* All the zones are sequential and empty */
-       if (find_next_zero_bit(zinfo->seq_zones, begin, end) == end &&
-           find_next_zero_bit(zinfo->empty_zones, begin, end) == end)
+       if (find_next_zero_bit(zinfo->seq_zones, end, begin) == end &&
+           find_next_zero_bit(zinfo->empty_zones, end, begin) == end)
                return 0;
 
        for (pos = start; pos < start + size; pos += zinfo->zone_size) {