lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

virtio_blk: check for hardsector size from host

Browse Source 
Currently virtio_blk assumes a 512 byte hard sector size. This can cause
trouble / performance issues if the backing has a different block size
(like a file on an ext3 file system formatted with 4k block size or a dasd).

Lets add a feature flag that tells the guest to use a different hard sector
size than 512 byte.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Christian Borntraeger
2008-05-29 11:08:26 +02:00
committed by Rusty Russell
parent e962fa660d
commit 066f4d82a6
2 changed files with 12 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/virtio_blk.h
View File

@@ -13,6 +13,7 @@
#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
#define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */
#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
struct virtio_blk_config
{
@@ -28,6 +29,8 @@ struct virtio_blk_config
__u8 heads;
__u8 sectors;
} geometry;
/* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
__u32 blk_size;
} __attribute__((packed));
/* These two define direction. */