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| author |   Matteo Croce <mcroce@microsoft.com> | 2021-07-13 01:05:28 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-08-02 13:37:28 -0600 |
| commit | 13927b31b13f3c6556221eff3487247bd3c7a245 (patch) | |
| tree | 41e7a6dd8a1acd054f7edfea42b451c2a279568e /Documentation/ABI/testing/sysfs-block | |
| parent | block: add ioctl to read the disk sequence number (diff) | |
| download | linux-dev-13927b31b13f3c6556221eff3487247bd3c7a245.tar.xz linux-dev-13927b31b13f3c6556221eff3487247bd3c7a245.zip | |
block: export diskseq in sysfs
Add a new sysfs handle to export the new diskseq value.
Place it in <sysfs>/block/<disk>/diskseq and document it.
$ grep . /sys/class/block/*/diskseq
/sys/class/block/loop0/diskseq:13
/sys/class/block/loop1/diskseq:14
/sys/class/block/loop2/diskseq:5
/sys/class/block/loop3/diskseq:6
/sys/class/block/ram0/diskseq:1
/sys/class/block/ram1/diskseq:2
/sys/class/block/vda/diskseq:7
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-5-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-block')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index e34cdeeeb9d4..a0ed87386639 100644 --- a/Documentation/ABI/testing/sysfs-block +++ b/Documentation/ABI/testing/sysfs-block @@ -28,6 +28,18 @@ Description: For more details refer Documentation/admin-guide/iostats.rst +What: /sys/block/<disk>/diskseq +Date: February 2021 +Contact: Matteo Croce <mcroce@microsoft.com> +Description: + The /sys/block/<disk>/diskseq files reports the disk + sequence number, which is a monotonically increasing + number assigned to every drive. + Some devices, like the loop device, refresh such number + every time the backing file is changed. + The value type is 64 bit unsigned. + + What: /sys/block/<disk>/<part>/stat Date: February 2008 Contact: Jerome Marchand <jmarchan@redhat.com> |