}
}
+/**
+ * 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.
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 */
* 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);
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;
};