linux-kernel - [PATCH 18/36] block: send disk "change" event for rescan

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Message-Id: <1208688366-9252-18-git-send-email-gregkh@suse.de>
Date:	Sun, 20 Apr 2008 03:45:48 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Kay Sievers <kay.sievers@...y.org>, David Zeuthen <david@...ar.dk>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 18/36] block: send disk "change" event for rescan_partitions()

From: Kay Sievers <kay.sievers@...y.org>

Userspace likes to get notified that the disk may have changed, when
rescan_partitions() is called after partitioning or media change. It will
make it possible to update the state of the disk with the "change" event,
before the following partition "add" events are handled.

Cc: David Zeuthen <david@...ar.dk>
Signed-off-by: Kay Sievers <kay.sievers@...y.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 fs/partitions/check.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 03f808c..6149e4b 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -473,6 +473,10 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
 		return 0;
 	if (IS_ERR(state))	/* I/O error reading the partition table */
 		return -EIO;
+
+	/* tell userspace that the media / partition table may have changed */
+	kobject_uevent(&disk->dev.kobj, KOBJ_CHANGE);
+
 	for (p = 1; p < state->limit; p++) {
 		sector_t size = state->parts[p].size;
 		sector_t from = state->parts[p].from;
-- 
1.5.4.5

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