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authorChristian Borntraeger <borntraeger@de.ibm.com>2008-05-29 11:08:26 +0200
committerRusty Russell <rusty@rustcorp.com.au>2008-07-25 12:06:05 +1000
commit066f4d82a67f621ddd547bfa4b9c94631d8457b0 (patch)
tree96bdeadd9af5b16476186df0ea8056175bc16cbb /include
parente962fa660d391fc9b90988e6538c94c858c099f9 (diff)
virtio_blk: check for hardsector size from host
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/virtio_blk.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
index 6a66c7f30bc..c1aef85243b 100644
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@ -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. */