| Message ID | 20210520135622.44625-1-mcroce@linux.microsoft.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | block: add a sequence number to disks | expand |
On Thu, May 20, 2021 at 3:56 PM Matteo Croce <mcroce@linux.microsoft.com> wrote: > > From: Matteo Croce <mcroce@microsoft.com> > > 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 > Hi Christoph, I just noticed that the series doesn't apply anymore. Before refreshing it, I wish to know what are your opinion on this one, as nobody expressed one on latest submission.
From: Matteo Croce <mcroce@microsoft.com> 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 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(-)