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-rw-r--r--include/block/block.h46
-rw-r--r--include/block/block_int.h63
-rw-r--r--include/block/nbd.h2
-rw-r--r--include/sysemu/block-backend.h3
4 files changed, 66 insertions, 48 deletions
diff --git a/include/block/block.h b/include/block/block.h
index 733a8ec2ec..616d8b9f12 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -226,33 +226,31 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
BlockReopenQueue *queue, Error **errp);
void bdrv_reopen_commit(BDRVReopenState *reopen_state);
void bdrv_reopen_abort(BDRVReopenState *reopen_state);
-int bdrv_read(BlockDriverState *bs, int64_t sector_num,
+int bdrv_read(BdrvChild *child, int64_t sector_num,
uint8_t *buf, int nb_sectors);
-int bdrv_write(BlockDriverState *bs, int64_t sector_num,
+int bdrv_write(BdrvChild *child, int64_t sector_num,
const uint8_t *buf, int nb_sectors);
-int bdrv_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
+int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
int count, BdrvRequestFlags flags);
-int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
-int bdrv_pread(BlockDriverState *bs, int64_t offset,
- void *buf, int count);
-int bdrv_preadv(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
-int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
- const void *buf, int count);
-int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
-int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
- const void *buf, int count);
-int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov);
-int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov);
+int bdrv_make_zero(BdrvChild *child, BdrvRequestFlags flags);
+int bdrv_pread(BdrvChild *child, int64_t offset, void *buf, int bytes);
+int bdrv_preadv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
+int bdrv_pwrite(BdrvChild *child, int64_t offset, const void *buf, int bytes);
+int bdrv_pwritev(BdrvChild *child, int64_t offset, QEMUIOVector *qiov);
+int bdrv_pwrite_sync(BdrvChild *child, int64_t offset,
+ const void *buf, int count);
+int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
+ int nb_sectors, QEMUIOVector *qiov);
+int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
+ int nb_sectors, QEMUIOVector *qiov);
/*
* Efficiently zero a region of the disk image. Note that this is a regular
* I/O request like read or write and should have a reasonable size. This
* function is not suitable for zeroing the entire image in a single request
* because it may allocate memory for the entire region.
*/
-int coroutine_fn bdrv_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset,
- int count, BdrvRequestFlags flags);
+int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child, int64_t offset,
+ int count, BdrvRequestFlags flags);
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
const char *backing_file);
int bdrv_get_backing_file_depth(BlockDriverState *bs);
@@ -310,10 +308,10 @@ BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
const char *node_name, Error **errp);
/* async block I/O */
-BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
+BlockAIOCB *bdrv_aio_readv(BdrvChild *child, int64_t sector_num,
QEMUIOVector *iov, int nb_sectors,
BlockCompletionFunc *cb, void *opaque);
-BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
+BlockAIOCB *bdrv_aio_writev(BdrvChild *child, int64_t sector_num,
QEMUIOVector *iov, int nb_sectors,
BlockCompletionFunc *cb, void *opaque);
BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
@@ -362,8 +360,8 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
int64_t sector_num, int nb_sectors, int *pnum);
-int bdrv_is_read_only(BlockDriverState *bs);
-int bdrv_is_sg(BlockDriverState *bs);
+bool bdrv_is_read_only(BlockDriverState *bs);
+bool bdrv_is_sg(BlockDriverState *bs);
bool bdrv_is_inserted(BlockDriverState *bs);
int bdrv_media_changed(BlockDriverState *bs);
void bdrv_lock_medium(BlockDriverState *bs, bool locked);
@@ -390,8 +388,8 @@ BlockDriverState *bdrv_first(BdrvNextIterator *it);
BlockDriverState *bdrv_next(BdrvNextIterator *it);
BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs);
-int bdrv_is_encrypted(BlockDriverState *bs);
-int bdrv_key_required(BlockDriverState *bs);
+bool bdrv_is_encrypted(BlockDriverState *bs);
+bool bdrv_key_required(BlockDriverState *bs);
int bdrv_set_key(BlockDriverState *bs, const char *key);
void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp);
int bdrv_query_missing_keys(void);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 205715600b..47b9aac71b 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -324,30 +324,48 @@ struct BlockDriver {
};
typedef struct BlockLimits {
- /* maximum number of sectors that can be discarded at once */
- int max_discard;
-
- /* optimal alignment for discard requests in sectors */
- int64_t discard_alignment;
+ /* Alignment requirement, in bytes, for offset/length of I/O
+ * requests. Must be a power of 2 less than INT_MAX; defaults to
+ * 1 for drivers with modern byte interfaces, and to 512
+ * otherwise. */
+ uint32_t request_alignment;
+
+ /* maximum number of bytes that can be discarded at once (since it
+ * is signed, it must be < 2G, if set), should be multiple of
+ * pdiscard_alignment, but need not be power of 2. May be 0 if no
+ * inherent 32-bit limit */
+ int32_t max_pdiscard;
+
+ /* optimal alignment for discard requests in bytes, must be power
+ * of 2, less than max_pdiscard if that is set, and multiple of
+ * bl.request_alignment. May be 0 if bl.request_alignment is good
+ * enough */
+ uint32_t pdiscard_alignment;
/* maximum number of bytes that can zeroized at once (since it is
- * signed, it must be < 2G, if set) */
+ * signed, it must be < 2G, if set), should be multiple of
+ * pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */
int32_t max_pwrite_zeroes;
/* optimal alignment for write zeroes requests in bytes, must be
- * power of 2, and less than max_pwrite_zeroes if that is set */
+ * power of 2, less than max_pwrite_zeroes if that is set, and
+ * multiple of bl.request_alignment. May be 0 if
+ * bl.request_alignment is good enough */
uint32_t pwrite_zeroes_alignment;
- /* optimal transfer length in sectors */
- int opt_transfer_length;
+ /* optimal transfer length in bytes (must be power of 2, and
+ * multiple of bl.request_alignment), or 0 if no preferred size */
+ uint32_t opt_transfer;
- /* maximal transfer length in sectors */
- int max_transfer_length;
+ /* maximal transfer length in bytes (need not be power of 2, but
+ * should be multiple of opt_transfer), or 0 for no 32-bit limit.
+ * For now, anything larger than INT_MAX is clamped down. */
+ uint32_t max_transfer;
- /* memory alignment so that no bounce buffer is needed */
+ /* memory alignment, in bytes so that no bounce buffer is needed */
size_t min_mem_alignment;
- /* memory alignment for bounce buffer */
+ /* memory alignment, in bytes, for bounce buffer */
size_t opt_mem_alignment;
/* maximum number of iovec elements */
@@ -411,14 +429,15 @@ struct BdrvChild {
struct BlockDriverState {
int64_t total_sectors; /* if we are reading a disk image, give its
size in sectors */
- int read_only; /* if true, the media is read only */
int open_flags; /* flags used to open the file, re-used for re-open */
- int encrypted; /* if true, the media is encrypted */
- int valid_key; /* if true, a valid encryption key has been set */
- int sg; /* if true, the device is a /dev/sg* */
- int copy_on_read; /* if true, copy read backing sectors into image
+ bool read_only; /* if true, the media is read only */
+ bool encrypted; /* if true, the media is encrypted */
+ bool valid_key; /* if true, a valid encryption key has been set */
+ bool sg; /* if true, the device is a /dev/sg* */
+ bool probed; /* if true, format was probed rather than specified */
+
+ int copy_on_read; /* if nonzero, copy read backing sectors into image.
note this is a reference count */
- bool probed;
BlockDriver *drv; /* NULL means no media */
void *opaque;
@@ -453,8 +472,6 @@ struct BlockDriverState {
/* I/O Limits */
BlockLimits bl;
- /* Alignment requirement for offset/length of I/O requests */
- unsigned int request_alignment;
/* Flags honored during pwrite (so far: BDRV_REQ_FUA) */
unsigned int supported_write_flags;
/* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
@@ -546,10 +563,10 @@ extern BlockDriver bdrv_qcow2;
*/
void bdrv_setup_io_funcs(BlockDriver *bdrv);
-int coroutine_fn bdrv_co_preadv(BlockDriverState *bs,
+int coroutine_fn bdrv_co_preadv(BdrvChild *child,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags);
-int coroutine_fn bdrv_co_pwritev(BlockDriverState *bs,
+int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags);
diff --git a/include/block/nbd.h b/include/block/nbd.h
index df1f804338..eeda3ebdf7 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -77,6 +77,8 @@ enum {
/* Maximum size of a single READ/WRITE data buffer */
#define NBD_MAX_BUFFER_SIZE (32 * 1024 * 1024)
+#define NBD_MAX_SECTORS (NBD_MAX_BUFFER_SIZE / BDRV_SECTOR_SIZE)
+
/* Maximum size of an export name. The NBD spec requires 256 and
* suggests that servers support up to 4096, but we stick to only the
* required size so that we can stack-allocate the names, and because
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index c04af8ea46..3c3e82f05d 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -124,6 +124,7 @@ int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset,
int count, BdrvRequestFlags flags,
BlockCompletionFunc *cb, void *opaque);
+int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags);
int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count);
int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count,
BdrvRequestFlags flags);
@@ -170,7 +171,7 @@ bool blk_is_available(BlockBackend *blk);
void blk_lock_medium(BlockBackend *blk, bool locked);
void blk_eject(BlockBackend *blk, bool eject_flag);
int blk_get_flags(BlockBackend *blk);
-int blk_get_max_transfer_length(BlockBackend *blk);
+uint32_t blk_get_max_transfer(BlockBackend *blk);
int blk_get_max_iov(BlockBackend *blk);
void blk_set_guest_block_size(BlockBackend *blk, int align);
void *blk_try_blockalign(BlockBackend *blk, size_t size);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-29 14:19:53 +0000