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[2.44.206.93]) by smtp.gmail.com with ESMTPSA id f5sm12741376wrg.67.2021.07.11.10.54.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 11 Jul 2021 10:54:33 -0700 (PDT) From: Matteo Croce To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jens Axboe Cc: linux-kernel@vger.kernel.org, Lennart Poettering , Luca Boccassi , Alexander Viro , Damien Le Moal , Tejun Heo , =?utf-8?q?Javier_Gonz=C3=A1lez?= , Niklas Cassel , Johannes Thumshirn , Hannes Reinecke , Matthew Wilcox , Christoph Hellwig , JeffleXu Subject: [PATCH v4 4/5] block: export diskseq in sysfs Date: Sun, 11 Jul 2021 19:54:14 +0200 Message-Id: <20210711175415.80173-5-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210711175415.80173-1-mcroce@linux.microsoft.com> References: <20210711175415.80173-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Matteo Croce Add a new sysfs handle to export the new diskseq value. Place it in /block//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 Signed-off-by: Matteo Croce Reviewed-by: Christoph Hellwig --- Documentation/ABI/testing/sysfs-block | 12 ++++++++++++ block/genhd.c | 10 ++++++++++ 2 files changed, 22 insertions(+) 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//diskseq +Date: February 2021 +Contact: Matteo Croce +Description: + The /sys/block//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///stat Date: February 2008 Contact: Jerome Marchand diff --git a/block/genhd.c b/block/genhd.c index 3d9c9d189ff7..422c0dbc6ce2 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -985,6 +985,14 @@ static ssize_t disk_discard_alignment_show(struct device *dev, return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue)); } +static ssize_t diskseq_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gendisk *disk = dev_to_disk(dev); + + return sprintf(buf, "%llu\n", disk->diskseq); +} + static DEVICE_ATTR(range, 0444, disk_range_show, NULL); static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); @@ -997,6 +1005,7 @@ static DEVICE_ATTR(capability, 0444, disk_capability_show, NULL); static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); +static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); #ifdef CONFIG_FAIL_MAKE_REQUEST ssize_t part_fail_show(struct device *dev, @@ -1042,6 +1051,7 @@ static struct attribute *disk_attrs[] = { &dev_attr_events.attr, &dev_attr_events_async.attr, &dev_attr_events_poll_msecs.attr, + &dev_attr_diskseq.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif