[PATCH] btrfs-progs: output sectorsize related warning message into stdout

[Qu Wenruo <wqu@suse.com>]

Since commit 90020a760584 ("btrfs-progs: mkfs: refactor how we handle
sectorsize override") we have extra warning message if the sectorsize of
mkfs doesn't match page size.

But this warning is show as stderr, which makes a lot of fstests cases
failure due to golden output mismatch.

Fix this by manually output the warning message as stdout.

This is just a temporary fix, a proper fix would needs kernel
/sys/fs/btrfs/features/supported_rw_sectorsize interface to do proper
prompt.

Fixes: 90020a760584 ("btrfs-progs: mkfs: refactor how we handle sectorsize override")
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 common/fsfeatures.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/common/fsfeatures.c b/common/fsfeatures.c
index 569208a9e5b1..f9492e30d57a 100644
--- a/common/fsfeatures.c
+++ b/common/fsfeatures.c
@@ -341,8 +341,16 @@ int btrfs_check_sectorsize(u32 sectorsize)
 		return -EINVAL;
 	}
 	if (page_size != sectorsize)
-		warning(
-"the filesystem may not be mountable, sectorsize %u doesn't match page size %u",
+		/*
+		 * warning() will output message into stderr, which will screw
+		 * up a lot of golden output of fstests. So here we use
+		 * printf().
+		 *
+		 * This will be replaced by proper supported rw/ro sector size
+		 * detection with kernel change in the future.
+		 */
+		printf(
+"WARNING: the filesystem may not be mountable, sectorsize %u doesn't match page size %u\n",
 			sectorsize, page_size);
 	return 0;
 }
-- 
2.30.1