diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/block-common.h | 11 | ||||
| -rw-r--r-- | include/block/block-io.h | 2 | ||||
| -rw-r--r-- | include/block/block_int-common.h | 27 | ||||
| -rw-r--r-- | include/block/block_int-global-state.h | 4 | ||||
| -rw-r--r-- | include/block/block_int-io.h | 4 |
5 files changed, 31 insertions, 17 deletions
diff --git a/include/block/block-common.h b/include/block/block-common.h index 0b831ef87b..c8c626daea 100644 --- a/include/block/block-common.h +++ b/include/block/block-common.h @@ -333,6 +333,17 @@ typedef enum { #define BDRV_BLOCK_RECURSE 0x40 #define BDRV_BLOCK_COMPRESSED 0x80 +/* + * Block status hints: the bitwise-or of these flags emphasize what + * the caller hopes to learn, and some drivers may be able to give + * faster answers by doing less work when the hint permits. + */ +#define BDRV_WANT_ZERO BDRV_BLOCK_ZERO +#define BDRV_WANT_OFFSET_VALID BDRV_BLOCK_OFFSET_VALID +#define BDRV_WANT_ALLOCATED BDRV_BLOCK_ALLOCATED +#define BDRV_WANT_PRECISE (BDRV_WANT_ZERO | BDRV_WANT_OFFSET_VALID | \ + BDRV_WANT_OFFSET_VALID) + typedef QTAILQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue; typedef struct BDRVReopenState { diff --git a/include/block/block-io.h b/include/block/block-io.h index b49e0537dd..b99cc98d26 100644 --- a/include/block/block-io.h +++ b/include/block/block-io.h @@ -161,6 +161,8 @@ bdrv_is_allocated_above(BlockDriverState *bs, BlockDriverState *base, int coroutine_fn GRAPH_RDLOCK bdrv_co_is_zero_fast(BlockDriverState *bs, int64_t offset, int64_t bytes); +int coroutine_fn GRAPH_RDLOCK +bdrv_co_is_all_zeroes(BlockDriverState *bs); int GRAPH_RDLOCK bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg, diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h index 0d8187f656..2982dd3118 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -604,15 +604,16 @@ struct BlockDriver { * according to the current layer, and should only need to set * BDRV_BLOCK_DATA, BDRV_BLOCK_ZERO, BDRV_BLOCK_OFFSET_VALID, * and/or BDRV_BLOCK_RAW; if the current layer defers to a backing - * layer, the result should be 0 (and not BDRV_BLOCK_ZERO). See - * block.h for the overall meaning of the bits. As a hint, the - * flag want_zero is true if the caller cares more about precise - * mappings (favor accurate _OFFSET_VALID/_ZERO) or false for - * overall allocation (favor larger *pnum, perhaps by reporting - * _DATA instead of _ZERO). The block layer guarantees input - * clamped to bdrv_getlength() and aligned to request_alignment, - * as well as non-NULL pnum, map, and file; in turn, the driver - * must return an error or set pnum to an aligned non-zero value. + * layer, the result should be 0 (and not BDRV_BLOCK_ZERO). The + * caller will synthesize BDRV_BLOCK_ALLOCATED based on the + * non-zero results. See block.h for the overall meaning of the + * bits. As a hint, the flags in @mode may include a bitwise-or + * of BDRV_WANT_ALLOCATED, BDRV_WANT_OFFSET_VALID, or + * BDRV_WANT_ZERO based on what the caller is looking for in the + * results. The block layer guarantees input clamped to + * bdrv_getlength() and aligned to request_alignment, as well as + * non-NULL pnum, map, and file; in turn, the driver must return + * an error or set pnum to an aligned non-zero value. * * Note that @bytes is just a hint on how big of a region the * caller wants to inspect. It is not a limit on *pnum. @@ -624,8 +625,8 @@ struct BlockDriver { * to clamping *pnum for return to its caller. */ int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_block_status)( - BlockDriverState *bs, - bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum, + BlockDriverState *bs, unsigned int mode, + int64_t offset, int64_t bytes, int64_t *pnum, int64_t *map, BlockDriverState **file); /* @@ -649,8 +650,8 @@ struct BlockDriver { QEMUIOVector *qiov, size_t qiov_offset); int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_snapshot_block_status)( - BlockDriverState *bs, bool want_zero, int64_t offset, int64_t bytes, - int64_t *pnum, int64_t *map, BlockDriverState **file); + BlockDriverState *bs, unsigned int mode, int64_t offset, + int64_t bytes, int64_t *pnum, int64_t *map, BlockDriverState **file); int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_pdiscard_snapshot)( BlockDriverState *bs, int64_t offset, int64_t bytes); diff --git a/include/block/block_int-global-state.h b/include/block/block_int-global-state.h index 0d93783763..e7c8f1a856 100644 --- a/include/block/block_int-global-state.h +++ b/include/block/block_int-global-state.h @@ -139,7 +139,7 @@ BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs, * @buf_size: The amount of data that can be in flight at one time. * @mode: Whether to collapse all images in the chain to the target. * @backing_mode: How to establish the target's backing chain after completion. - * @zero_target: Whether the target should be explicitly zero-initialized + * @target_is_zero: Whether the target already is zero-initialized. * @on_source_error: The action to take upon error reading from the source. * @on_target_error: The action to take upon error writing to the target. * @unmap: Whether to unmap target where source sectors only contain zeroes. @@ -159,7 +159,7 @@ void mirror_start(const char *job_id, BlockDriverState *bs, int creation_flags, int64_t speed, uint32_t granularity, int64_t buf_size, MirrorSyncMode mode, BlockMirrorBackingMode backing_mode, - bool zero_target, + bool target_is_zero, BlockdevOnError on_source_error, BlockdevOnError on_target_error, bool unmap, const char *filter_node_name, diff --git a/include/block/block_int-io.h b/include/block/block_int-io.h index 4a7cf2b4fd..4f94eb3c5a 100644 --- a/include/block/block_int-io.h +++ b/include/block/block_int-io.h @@ -38,8 +38,8 @@ int coroutine_fn GRAPH_RDLOCK bdrv_co_preadv_snapshot(BdrvChild *child, int64_t offset, int64_t bytes, QEMUIOVector *qiov, size_t qiov_offset); int coroutine_fn GRAPH_RDLOCK bdrv_co_snapshot_block_status( - BlockDriverState *bs, bool want_zero, int64_t offset, int64_t bytes, - int64_t *pnum, int64_t *map, BlockDriverState **file); + BlockDriverState *bs, unsigned int mode, int64_t offset, + int64_t bytes, int64_t *pnum, int64_t *map, BlockDriverState **file); int coroutine_fn GRAPH_RDLOCK bdrv_co_pdiscard_snapshot(BlockDriverState *bs, int64_t offset, int64_t bytes); |