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From: Matteo Croce <mcroce@linux.microsoft.com>
To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Jens Axboe <axboe@kernel.dk>,
	Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org,
	"Lennart Poettering" <lennart@poettering.net>,
	"Luca Boccassi" <bluca@debian.org>,
	"Alexander Viro" <viro@zeniv.linux.org.uk>,
	"Damien Le Moal" <damien.lemoal@wdc.com>,
	"Tejun Heo" <tj@kernel.org>,
	"Javier González" <javier@javigon.com>,
	"Niklas Cassel" <niklas.cassel@wdc.com>,
	"Johannes Thumshirn" <johannes.thumshirn@wdc.com>,
	"Hannes Reinecke" <hare@suse.de>,
	"Matthew Wilcox" <willy@infradead.org>,
	JeffleXu <jefflexu@linux.alibaba.com>
Subject: [PATCH v5 2/6] block: export the diskseq in uevents
Date: Tue, 13 Jul 2021 01:05:26 +0200	[thread overview]
Message-ID: <20210712230530.29323-3-mcroce@linux.microsoft.com> (raw)
In-Reply-To: <20210712230530.29323-1-mcroce@linux.microsoft.com>

From: Matteo Croce <mcroce@microsoft.com>

Export the newly introduced diskseq in uevents:

    $ udevadm info /sys/class/block/* |grep -e DEVNAME -e DISKSEQ
    E: DEVNAME=/dev/loop0
    E: DISKSEQ=1
    E: DEVNAME=/dev/loop1
    E: DISKSEQ=2
    E: DEVNAME=/dev/loop2
    E: DISKSEQ=3
    E: DEVNAME=/dev/loop3
    E: DISKSEQ=4
    E: DEVNAME=/dev/loop4
    E: DISKSEQ=5
    E: DEVNAME=/dev/loop5
    E: DISKSEQ=6
    E: DEVNAME=/dev/loop6
    E: DISKSEQ=7
    E: DEVNAME=/dev/loop7
    E: DISKSEQ=8
    E: DEVNAME=/dev/nvme0n1
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p1
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p2
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p3
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p4
    E: DISKSEQ=9
    E: DEVNAME=/dev/nvme0n1p5
    E: DISKSEQ=9
    E: DEVNAME=/dev/sda
    E: DISKSEQ=10
    E: DEVNAME=/dev/sda1
    E: DISKSEQ=10
    E: DEVNAME=/dev/sda2
    E: DISKSEQ=10

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
---
 block/genhd.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/block/genhd.c b/block/genhd.c
index 0be32dbe97bb..3126f8afe3b8 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1101,8 +1101,17 @@ static void disk_release(struct device *dev)
 		blk_put_queue(disk->queue);
 	kfree(disk);
 }
+
+static int block_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+	struct gendisk *disk = dev_to_disk(dev);
+
+	return add_uevent_var(env, "DISKSEQ=%llu", disk->diskseq);
+}
+
 struct class block_class = {
 	.name		= "block",
+	.dev_uevent	= block_uevent,
 };
 
 static char *block_devnode(struct device *dev, umode_t *mode,
-- 
2.31.1


  parent reply	other threads:[~2021-07-12 23:07 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-12 23:05 [PATCH v5 0/5] block: add a sequence number to disks Matteo Croce
2021-07-12 23:05 ` [PATCH v5 1/6] block: add disk sequence number Matteo Croce
2021-07-12 23:05 ` Matteo Croce [this message]
2021-07-12 23:05 ` [PATCH v5 3/6] block: add ioctl to read the " Matteo Croce
2021-07-12 23:05 ` [PATCH v5 4/6] block: export diskseq in sysfs Matteo Croce
2021-07-12 23:05 ` [PATCH v5 5/6] block: add a helper to raise a media changed event Matteo Croce
2021-07-12 23:05 ` [PATCH v5 6/6] loop: raise media_change event Matteo Croce
2021-07-13  6:03   ` Christoph Hellwig
2021-07-20 17:27 ` [PATCH v5 0/5] block: add a sequence number to disks Luca Boccassi
2021-07-22 11:41   ` Matteo Croce
2021-07-28 19:01   ` Lennart Poettering
2021-07-28 19:22 ` Jens Axboe

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