From 892b7de832681cdfff22a6e96cb0280b59684024 Mon Sep 17 00:00:00 2001 From: Ekaterina Tumanova Date: Mon, 16 Feb 2015 12:47:54 +0100 Subject: [PATCH] block: add bdrv functions for geometry and blocksize Add driver functions for geometry and blocksize detection Signed-off-by: Ekaterina Tumanova Reviewed-by: Thomas Huth Reviewed-by: Markus Armbruster Reviewed-by: Stefan Hajnoczi Message-id: 1424087278-49393-2-git-send-email-tumanova@linux.vnet.ibm.com Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 34 ++++++++++++++++++++++++++++++++++ include/block/block.h | 13 +++++++++++++ include/block/block_int.h | 15 +++++++++++++++ 3 files changed, 62 insertions(+) diff --git a/block.c b/block.c index 28ea19aafb..191a847940 100644 --- a/block.c +++ b/block.c @@ -568,6 +568,40 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) } } +/** + * Try to get @bs's logical and physical block size. + * On success, store them in @bsz struct and return 0. + * On failure return -errno. + * @bs must not be empty. + */ +int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) +{ + BlockDriver *drv = bs->drv; + + if (drv && drv->bdrv_probe_blocksizes) { + return drv->bdrv_probe_blocksizes(bs, bsz); + } + + return -ENOTSUP; +} + +/** + * Try to get @bs's geometry (cyls, heads, sectors). + * On success, store them in @geo struct and return 0. + * On failure return -errno. + * @bs must not be empty. + */ +int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo) +{ + BlockDriver *drv = bs->drv; + + if (drv && drv->bdrv_probe_geometry) { + return drv->bdrv_probe_geometry(bs, geo); + } + + return -ENOTSUP; +} + /* * Create a uniquely-named empty temporary file. * Return 0 upon success, otherwise a negative errno value. diff --git a/include/block/block.h b/include/block/block.h index 649c269ecd..473c746342 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -60,6 +60,17 @@ typedef enum { BDRV_REQ_MAY_UNMAP = 0x4, } BdrvRequestFlags; +typedef struct BlockSizes { + uint32_t phys; + uint32_t log; +} BlockSizes; + +typedef struct HDGeometry { + uint32_t heads; + uint32_t sectors; + uint32_t cylinders; +} HDGeometry; + #define BDRV_O_RDWR 0x0002 #define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */ #define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */ @@ -550,6 +561,8 @@ AioContext *bdrv_get_aio_context(BlockDriverState *bs); * This function must be called with iothread lock held. */ void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context); +int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz); +int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo); void bdrv_io_plug(BlockDriverState *bs); void bdrv_io_unplug(BlockDriverState *bs); diff --git a/include/block/block_int.h b/include/block/block_int.h index b88633d0c0..dccb092df7 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -275,6 +275,21 @@ struct BlockDriver { void (*bdrv_io_unplug)(BlockDriverState *bs); void (*bdrv_flush_io_queue)(BlockDriverState *bs); + /** + * Try to get @bs's logical and physical block size. + * On success, store them in @bsz and return zero. + * On failure, return negative errno. + */ + int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz); + /** + * Try to get @bs's geometry (cyls, heads, sectors) + * On success, store them in @geo and return 0. + * On failure return -errno. + * Only drivers that want to override guest geometry implement this + * callback; see hd_geometry_guess(). + */ + int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo); + QLIST_ENTRY(BlockDriver) list; }; -- 2.11.4.GIT