fstests: initial bcachefs support

To get started, you'll need to get bcachefs from the kernel repository
  https://evilpiepirate.org/git/bcachefs.git/

and tools from
  https://evilpiepirate.org/git/bcache-tools.git/

Build kernel as normal, enabling CONFIG_BCACHEFS_FS (and probably
CONFIG_BCACHEFS_DEBUG), and build and install tools. Then running
fstests is exactly the same as other local filesystems - just set
FSTYP=bcachefs

Also see https://evilpiepirate.org/git/ktest.git/ for a tool for
conveniently building kernel and running fstests inside a qemu VM.

This patch also updates generic/441 to run the more thorough test on
bcachefs, and generic/425 to not run on bcachefs (since bcachefs does
not store xattrs in blocks)

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

common/attr

@@ -33,6 +33,9 @@ _acl_get_max()
 			echo 506
 		fi
 		;;
+	bcachefs)
+		echo 251
+		;;
 	*)
 		echo 0
 		;;
@@ -273,6 +276,9 @@ pvfs2)
 9p|ceph|nfs)
 	MAX_ATTRVAL_SIZE=65536
 	;;
+bcachefs)
+	MAX_ATTRVAL_SIZE=1024
+	;;
 *)
 	# Assume max ~1 block of attrs
 	BLOCK_SIZE=`_get_block_size $TEST_DIR`

common/config

@@ -416,6 +416,9 @@ _mkfs_opts()
 	btrfs)
 		export MKFS_OPTIONS="$BTRFS_MKFS_OPTIONS"
 		;;
+	bcachefs)
+		export MKFS_OPTIONS=$BCACHEFS_MKFS_OPTIONS
+		;;
 	*)
 		;;
 	esac

common/quota

@@ -17,7 +17,7 @@ _require_quota()
 	    _notrun "Installed kernel does not support quotas"
 	fi
 	;;
-    gfs2|ocfs2)
+    gfs2|ocfs2|bcachefs)
 	;;
     xfs)
 	if [ ! -f /proc/fs/xfs/xqmstat ]; then
@@ -278,7 +278,7 @@ _check_quota_usage()
 
 	VFS_QUOTA=0
 	case $FSTYP in
-	ext2|ext3|ext4|ext4dev|f2fs|reiserfs|gfs2)
+	ext2|ext3|ext4|ext4dev|f2fs|reiserfs|gfs2|bcachefs)
 		VFS_QUOTA=1
 		quotaon -f -u -g $SCRATCH_MNT 2>/dev/null
 		;;

common/rc

@@ -1065,6 +1065,9 @@ _scratch_mkfs_sized()
 		fi
 		export MOUNT_OPTIONS="-o size=$fssize $TMPFS_MOUNT_OPTIONS"
 		;;
+	bcachefs)
+		$MKFS_PROG -t $FSTYP -- $MKFS_OPTIONS --fs_size=$fssize --block_size=$blocksize $SCRATCH_DEV
+		;;
 	*)
 		_notrun "Filesystem $FSTYP not supported in _scratch_mkfs_sized"
 		;;
@@ -1133,6 +1136,9 @@ _scratch_mkfs_blocksized()
     ocfs2)
 	yes | ${MKFS_PROG} -t $FSTYP -F $MKFS_OPTIONS -b $blocksize -C $blocksize $SCRATCH_DEV
 	;;
+    bcachefs)
+	${MKFS_PROG} -t $FSTYP $MKFS_OPTIONS --block_size=$blocksize $SCRATCH_DEV
+	;;
     *)
 	_notrun "Filesystem $FSTYP not supported in _scratch_mkfs_blocksized"
 	;;
@@ -1179,6 +1185,11 @@ _repair_scratch_fs()
 	fi
 	return $res
         ;;
+    bcachefs)
+	# With bcachefs, if fsck detects any errors we consider it a bug and we
+	# want the test to fail:
+	_check_scratch_fs
+	;;
     *)
 	local dev=$SCRATCH_DEV
 	local fstyp=$FSTYP

tests/generic/425

@@ -30,6 +30,9 @@ _cleanup()
 
 # real QA test starts here
 _supported_fs generic
+
+[ $FSTYP = bcachefs ] && _notrun "bcachefs does not store xattrs in blocks"
+
 _require_scratch
 _require_attrs
 _require_xfs_io_command "fiemap" "-a"

tests/generic/441

@@ -40,7 +40,7 @@ case $FSTYP in
 	btrfs)
 		_notrun "btrfs has a specialized test for this"
 		;;
-	ext3|ext4|xfs)
+	ext3|ext4|xfs|bcachefs)
 		# Do the more thorough test if we have a logdev
 		_has_logdev && sflag=''
 		;;