linux-ext4 - [PATCH v2 1/6] common/rc: fix btrfs mixed mode usage in _scratch_mkfs

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Date:   Wed,  9 Feb 2022 21:33:00 +0900
From:   Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
To:     fstests@...r.kernel.org, linux-btrfs@...r.kernel.org
Cc:     linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        Naohiro Aota <naohiro.aota@....com>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
Subject: [PATCH v2 1/6] common/rc: fix btrfs mixed mode usage in _scratch_mkfs_sized

The helper function _scratch_mkfs_sized needs a couple of improvements
for btrfs. At first, the function adds --mixed option to mkfs.btrfs when
the filesystem size is smaller then 256MiB, but this threshold is no
longer correct and it should be 109MiB. Secondly, the --mixed option
shall not be specified to mkfs.btrfs for zoned devices, since zoned
devices does not allow mixing metadata blocks and data blocks.

Suggested-by: Naohiro Aota <naohiro.aota@....com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@....com>
---
 common/rc | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/common/rc b/common/rc
index b3289de9..eb2493d1 100644
--- a/common/rc
+++ b/common/rc
@@ -1075,10 +1075,10 @@ _scratch_mkfs_sized()
 		;;
 	btrfs)
 		local mixed_opt=
-		# minimum size that's needed without the mixed option.
-		# Ref: btrfs-prog: btrfs_min_dev_size()
-		# Non mixed mode is also the default option.
-		(( fssize < $((256 * 1024 *1024)) )) && mixed_opt='--mixed'
+		# Mixed option is required when the filesystem size is small and
+		# the device is not zoned. Ref: btrfs-progs: btrfs_min_dev_size()
+		(( fssize < $((109 * 1024 * 1024)) )) &&
+			! _scratch_btrfs_is_zoned && mixed_opt='--mixed'
 		$MKFS_BTRFS_PROG $MKFS_OPTIONS $mixed_opt -b $fssize $SCRATCH_DEV
 		;;
 	jfs)
-- 
2.34.1