linux-kernel - [PATCH 2/2] Add BLKPG_GET

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Date:	Sat, 24 Dec 2011 17:21:15 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	vgoyal@...hat.com
Cc:	joe@...ches.com, kzak@...hat.com, linux-kernel@...r.kernel.org,
	jaxboe@...ionio.com, Phillip Susi <psusi@....rr.com>
Subject: [PATCH 2/2] Add BLKPG_GET_PARTITION operation

Add a new operation to the BLKPG ioctl to read the partition.
This allows user space to find the current start and length
of a partition without having to open the partition and use
the long depreciated HDIO_GETGEO ioctl.

Signed-off-by: Phillip Susi <psusi@....rr.com>
---
 block/ioctl.c         |   15 +++++++++++++++
 include/linux/blkpg.h |    1 +
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/block/ioctl.c b/block/ioctl.c
index 08b2bd6..fad9064 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -141,6 +141,21 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
 			bdput(bdevp);
 			disk_put_part(part);
 			return 0;
+		case BLKPG_GET_PARTITION:
+			mutex_lock(&bdev->bd_mutex);
+			part = disk_get_part(disk, partno);
+			if (!part)
+			{
+				mutex_unlock(&bdev->bd_mutex);
+				return -ENXIO;
+			}
+			p.start = part->start_sect << 9;
+			p.length = part->nr_sects << 9;
+			disk_put_part(part);
+			mutex_unlock(&bdev->bd_mutex);
+			if (copy_to_user(a.data, &p, sizeof(struct blkpg_partition)))
+				return -EFAULT;
+			return 0;
 		default:
 			return -EINVAL;
 	}
diff --git a/include/linux/blkpg.h b/include/linux/blkpg.h
index a851944..72bf5e2 100644
--- a/include/linux/blkpg.h
+++ b/include/linux/blkpg.h
@@ -41,6 +41,7 @@ struct blkpg_ioctl_arg {
 #define BLKPG_ADD_PARTITION	1
 #define BLKPG_DEL_PARTITION	2
 #define BLKPG_RESIZE_PARTITION	3
+#define BLKPG_GET_PARTITION	4
 
 /* Sizes of name fields. Unused at present. */
 #define BLKPG_DEVNAMELTH	64
-- 
1.7.5.4

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