From: Matteo Croce <mcroce@xxxxxxxxxxxxx> With this series a monotonically increasing number is added to disks, precisely in the genhd struct, and it's exported in sysfs and uevent. This helps the userspace correlate events for devices that reuse the same device, like loop. The first patch is the core one, the 2..4 expose the information in different ways, the 5th increases the seqnum on media change and the last one increases the sequence number for loop devices upon attach, detach or reconfigure. If merged, this feature will immediately used by the userspace: https://github.com/systemd/systemd/issues/17469#issuecomment-762919781 v2 -> v3: - rebased on top of 5.13-rc7 - resend because it appeared archived on patchwork v1 -> v2: - increase seqnum on media change - increase on loop detach Matteo Croce (6): block: add disk sequence number block: add ioctl to read the disk sequence number block: refactor sysfs code block: export diskseq in sysfs block: increment sequence number loop: increment sequence number Documentation/ABI/testing/sysfs-block | 12 +++++++ block/genhd.c | 46 ++++++++++++++++++++++++--- block/ioctl.c | 2 ++ drivers/block/loop.c | 5 +++ include/linux/genhd.h | 2 ++ include/uapi/linux/fs.h | 1 + 6 files changed, 64 insertions(+), 4 deletions(-) -- 2.31.1
