From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikanth Karthikesan Subject: [RESEND][PATCH] Send uevents for disk write_protect changes Date: Tue, 21 Jul 2009 11:28:07 +0530 Message-ID: <200907211128.07252.knikanth@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: jens.axboe@oracle.com Cc: Hannes Reinecke , linux-kernel@vger.kernel.org, Tejun Heo , device-mapper development List-Id: dm-devel.ids Hi This patch is needed for the dm-multipath, so that the daemon can capture the event and reload the dm table when the read-only setting of the disk changes. Can this be merged? Thanks Nikanth From: Hannes Reinecke Subject: Send uevents for write_protect changes Whenever a block device changes it's read-only attribute notify the userspace about it. Signed-off-by: Hannes Reinecke Signed-off-by: Nikanth Karthikesan --- diff --git a/block/genhd.c b/block/genhd.c index f4c64c2..b89328e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1215,6 +1215,16 @@ void put_disk(struct gendisk *disk) EXPORT_SYMBOL(put_disk); +static void set_disk_ro_uevent(struct gendisk *gd, int ro) +{ + char event[] = "DISK_RO=1"; + char *envp[] = { event, NULL }; + + if (!ro) + event[8] = '0'; + kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); +} + void set_device_ro(struct block_device *bdev, int flag) { bdev->bd_part->policy = flag; @@ -1227,8 +1237,12 @@ void set_disk_ro(struct gendisk *disk, int flag) struct disk_part_iter piter; struct hd_struct *part; - disk_part_iter_init(&piter, disk, - DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); + if (disk->part0.policy != flag) { + set_disk_ro_uevent(disk, flag); + disk->part0.policy = flag; + } + + disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter);