[PATCH v2 2/2] common/rc: improve block size support for bcachefs

[Su Yue <glass.su@suse.com>]

For bcachefs, def_blksz is never assigned even MKFS_OPTIONS contains option
'--block_size'. So block size of bcachefs on scratch dev is always 4096
if _scratch_mkfs_sized is called without second parameter.

Add the pattern to set def_blksz if '--block_size' is given in MKFS_OPTIONS.

Signed-off-by: Su Yue <glass.su@suse.com>
---
changelog:
v2:
    Born.
---
 common/rc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/rc b/common/rc
index 31c21d2a8360..6a01de69cf05 100644
--- a/common/rc
+++ b/common/rc
@@ -950,6 +950,9 @@ _scratch_mkfs_sized()
 	jfs)
 		def_blksz=4096
 		;;
+	bcachefs)
+		def_blksz=`echo $MKFS_OPTIONS | sed -rn 's/.*(--block_size)[ =]?+([0-9]+).*/\2/p'`
+		;;
 	esac
 
 	[ -n "$def_blksz" ] && blocksize=$def_blksz
-- 
2.43.0