From: Naohiro Aota <naohiro.aota@wdc.com>
Date: Tue, 18 Apr 2023 17:45:24 +0900
Subject: [PATCH] btrfs: zoned: fix wrong use of bitops API in
 btrfs_ensure_empty_zones
References: bsc#1012628
Patch-mainline: 6.3.3
Git-commit: 631003e2333c12cc1b52df06a707365b7363a159

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/btrfs/zoned.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 45d04092..e87b5540 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1168,12 +1168,12 @@ 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) {
-- 
2.35.3