Introduce _loop_image_create_clone() and _loop_image_destroy() to mkfs an image file and clone it to another image file, and attach a loop device to them. And its destroy part.
Signed-off-by: Anand Jain <[email protected]> --- common/rc | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/common/rc b/common/rc index 79189e7e6e94..d7e3e0bdfb1e 100644 --- a/common/rc +++ b/common/rc @@ -1520,6 +1520,69 @@ _scratch_resvblks() esac } +# Create a small loop image, run an optional tuning function ($2) on it, +# clone it, and attach both to loop devices, returned in ($1). +# Args: +# $1: Nameref to return the array of allocated loop devices [base, clone]. +# $2: Optional callback function to tune the base filesystem before cloning. +_loop_image_create_clone() +{ + local -n _ret=$1 + local pre_clone_tune_func="$2" + local img_file=$TEST_DIR/${seq}.img + local img_file_clone=$TEST_DIR/${seq}_clone.img + local size=$(_small_fs_size_mb 128) # Smallest possible + local loop_devs + + # Since we copy the block device image, we keep its size small. + _require_fs_space $TEST_DIR $((size * 1024)) + + _create_file_sized $((size * 1024 * 1024)) $img_file || + _fail "Failed: Create $img_file $size" + + loop_devs=$(_create_loop_device $img_file) + _ret=($loop_devs) + + case $FSTYP in + xfs) + _mkfs_dev "-s size=4096" ${loop_devs[0]} + ;; + btrfs) + _mkfs_dev ${loop_devs[0]} + ;; + *) + _mkfs_dev ${loop_devs[0]} + ;; + esac + + # Only execute if the function argument is not empty + if [ -n "$pre_clone_tune_func" ]; then + $pre_clone_tune_func ${loop_devs[0]} + fi + + sync ${loop_devs[0]} + cp $img_file $img_file_clone + + loop_devs="$loop_devs $(_create_loop_device $img_file_clone)" + + _ret=($loop_devs) +} + +# Teardown loop devices and delete their underlying backing image files. +# Accepts a list of loop device paths (e.g., /dev/loop0 /dev/loop1). +_loop_image_destroy() +{ + for d in "$@"; do + # Retrieve the path of the backing file + local f=$(losetup --noheadings --output BACK-FILE $d) + + # Detach the loop device from the backing file + _destroy_loop_device "$d" + + # Clean up the backing disk image file + [ -n "$f" ] && rm -f "$f" + done +} # Repair scratch filesystem. Returns 0 if the FS is good to go (either no # errors found or errors were fixed) and nonzero otherwise; also spits out -- 2.43.0 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
