[RESEND][PATCH] Send uevents for disk write_protect changes

[RESEND][PATCH] Send uevents for disk write_protect changes

[Nikanth Karthikesan]

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 <hare@suse.de>
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 <hare@suse.de>
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>

---

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);

Re: [RESEND][PATCH] Send uevents for disk write_protect changes

[Tejun Heo]

Nikanth Karthikesan wrote:
> 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?

This is for the next merge window, right?

Thanks.

-- 
tejun

Re: [RESEND][PATCH] Send uevents for disk write_protect changes

[Jens Axboe]

On Tue, Jul 21 2009, Nikanth Karthikesan wrote:
> 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?

Looks fine to me, merged for 2.6.32.

> 
> Thanks
> Nikanth
> 
> From: Hannes Reinecke <hare@suse.de>
> 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 <hare@suse.de>
> Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
> 
> ---
> 
> 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);
> 
> 

-- 
Jens Axboe