[PATCH v4 2/2] common/rc: improve block_size support for bcachefs

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

From: Su Yue <glass.su@suse.com>

mkfs.bcachefs now supports option '--block_size' to allow
custom block_size.

Add the pattern to set def_blksz if MKFS_OPTIONS contains the
option in _scratch_mkfs_sized.
Also let mkfs.bcachefs decide blocksize if no option is given in
MKFS_OPTIONS or _scratch_mkfs_sized parameter.

Signed-off-by: Su Yue <glass.su@suse.com>
---
changelog:
v4:
    Respect block_size in MKFS_OPTIONS. 
v3:
    Add logic to Let mkfs.bcachefs decide blocksize if no option is given in
    local.config or _scratch_mkfs_sized parameter.
v2:
    Born.
---
 common/rc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/common/rc b/common/rc
index 31c21d2a8360..315a2413f963 100644
--- a/common/rc
+++ b/common/rc
@@ -930,6 +930,7 @@ _scratch_mkfs_sized()
 	local fssize=$1
 	local blocksize=$2
 	local def_blksz
+	local blocksize_opt
 
 	case $FSTYP in
 	xfs)
@@ -950,6 +951,13 @@ _scratch_mkfs_sized()
 	jfs)
 		def_blksz=4096
 		;;
+	bcachefs)
+		def_blksz=`echo $MKFS_OPTIONS | sed -rn 's/.*(--block_size)[ =]?+([0-9]+).*/\2/p'`
+		[ -n "$blocksize" ] && blocksize_opt="--block_size=$blocksize"
+		[ -n "$def_blksize" ] && blocksize_opt="--block_size=$def_blksize"
+		# If no block size is given by local.confg or parameter, blocksize_opt is empty.
+		# Let MKFS_BCACHEFS_PROG decide block size on its own.
+		;;
 	esac
 
 	[ -n "$def_blksz" ] && blocksize=$def_blksz
@@ -1051,7 +1059,7 @@ _scratch_mkfs_sized()
 		export MOUNT_OPTIONS="-o size=$fssize $TMPFS_MOUNT_OPTIONS"
 		;;
 	bcachefs)
-		$MKFS_BCACHEFS_PROG $MKFS_OPTIONS --fs_size=$fssize --block_size=$blocksize $SCRATCH_DEV
+		$MKFS_BCACHEFS_PROG $MKFS_OPTIONS --fs_size=$fssize $blocksize_opt $SCRATCH_DEV
 		;;
 	*)
 		_notrun "Filesystem $FSTYP not supported in _scratch_mkfs_sized"
-- 
2.43.0