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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>
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>,
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        Niklas Cassel <niklas.cassel@wdc.com>,
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        Hannes Reinecke <hare@suse.de>,
        Matthew Wilcox <willy@infradead.org>,
        Christoph Hellwig <hch@infradead.org>,
        JeffleXu <jefflexu@linux.alibaba.com>
Subject: [PATCH v3 5/6] block: increment sequence number
Date:   Wed, 23 Jun 2021 12:58:57 +0200
Message-Id: <20210623105858.6978-6-mcroce@linux.microsoft.com>
In-Reply-To: <20210623105858.6978-1-mcroce@linux.microsoft.com>
References: <20210623105858.6978-1-mcroce@linux.microsoft.com>
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From: Matteo Croce <mcroce@microsoft.com>

Increment the disk sequence number when the media has changed,
i.e. on DISK_EVENT_MEDIA_CHANGE event.

    $ cat /sys/class/block/sr0/diskseq
    12
    $ eject
    $ cat /sys/class/block/sr0/diskseq
    22

Signed-off-by: Matteo Croce <mcroce@microsoft.com>
---
 block/genhd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/genhd.c b/block/genhd.c
index 768d8d5d1eca..9d58e0ea18ae 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1657,6 +1657,9 @@ static void disk_check_events(struct disk_events *ev,
 
 	spin_unlock_irq(&ev->lock);
 
+	if (events & DISK_EVENT_MEDIA_CHANGE)
+		inc_diskseq(disk);
+
 	/*
 	 * Tell userland about new events.  Only the events listed in
 	 * @disk->events are reported, and only if DISK_EVENT_FLAG_UEVENT
-- 
2.31.1