On 1/25/21 23:55, Shiyang Ruan wrote:
With the support of ->rmap(), it is possible to obtain the superblock on a mapped device. If a pmem device is used as one target of mapped device, we cannot obtain its superblock directly. With the help of SYSFS, the mapped device can be found on the target devices. So, we iterate the bdev->bd_holder_disks to obtain its mapped device. Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxxxxx> --- drivers/md/dm.c | 61 +++++++++++++++++++++++++++++++++++++++++++ drivers/nvdimm/pmem.c | 11 +++----- fs/block_dev.c | 42 ++++++++++++++++++++++++++++- include/linux/genhd.h | 2 ++ 4 files changed, 107 insertions(+), 9 deletions(-)
I can't see md raid is involved here, perhaps dm-devel need to be cced instead of raid list. And the subject need to be changed as well.
Thanks, Guoqing
