block/io: use int64_t bytes in copy_range

We are generally moving to int64_t for both offset and bytes parameters
on all io paths.

Main motivation is realization of 64-bit write_zeroes operation for
fast zeroing large disk chunks, up to the whole disk.

We chose signed type, to be consistent with off_t (which is signed) and
with possibility for signed return type (where negative value means
error).

So, convert now copy_range parameters which are already 64bit to signed
type.

It's safe as we don't work with requests overflowing BDRV_MAX_LENGTH
(which is less than INT64_MAX), and do check the requests in
bdrv_co_copy_range_internal() (by bdrv_check_request32(), which calls
bdrv_check_request()).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201211183934.169161-17-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

2 files changed, 13 insertions, 13 deletions

diff --git a/block/io.c b/block/io.c
index 8817c84966..b0435ed670 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3201,8 +3201,8 @@ void bdrv_unregister_buf(BlockDriverState *bs, void *host)
 }
 
 static int coroutine_fn bdrv_co_copy_range_internal(
-        BdrvChild *src, uint64_t src_offset, BdrvChild *dst,
-        uint64_t dst_offset, uint64_t bytes,
+        BdrvChild *src, int64_t src_offset, BdrvChild *dst,
+        int64_t dst_offset, int64_t bytes,
         BdrvRequestFlags read_flags, BdrvRequestFlags write_flags,
         bool recurse_src)
 {
@@ -3280,9 +3280,9 @@ static int coroutine_fn bdrv_co_copy_range_internal(
  *
  * See the comment of bdrv_co_copy_range for the parameter and return value
  * semantics. */
-int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, uint64_t src_offset,
-                                         BdrvChild *dst, uint64_t dst_offset,
-                                         uint64_t bytes,
+int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, int64_t src_offset,
+                                         BdrvChild *dst, int64_t dst_offset,
+                                         int64_t bytes,
                                          BdrvRequestFlags read_flags,
                                          BdrvRequestFlags write_flags)
 {
@@ -3296,9 +3296,9 @@ int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, uint64_t src_offset,
  *
  * See the comment of bdrv_co_copy_range for the parameter and return value
  * semantics. */
-int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset,
-                                       BdrvChild *dst, uint64_t dst_offset,
-                                       uint64_t bytes,
+int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, int64_t src_offset,
+                                       BdrvChild *dst, int64_t dst_offset,
+                                       int64_t bytes,
                                        BdrvRequestFlags read_flags,
                                        BdrvRequestFlags write_flags)
 {
@@ -3308,9 +3308,9 @@ int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset,
                                        bytes, read_flags, write_flags, false);
 }
 
-int coroutine_fn bdrv_co_copy_range(BdrvChild *src, uint64_t src_offset,
-                                    BdrvChild *dst, uint64_t dst_offset,
-                                    uint64_t bytes, BdrvRequestFlags read_flags,
+int coroutine_fn bdrv_co_copy_range(BdrvChild *src, int64_t src_offset,
+                                    BdrvChild *dst, int64_t dst_offset,
+                                    int64_t bytes, BdrvRequestFlags read_flags,
                                     BdrvRequestFlags write_flags)
 {
     return bdrv_co_copy_range_from(src, src_offset,
diff --git a/block/trace-events b/block/trace-events
index a8d3fe94e6..1a12d634e2 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -15,8 +15,8 @@ bdrv_co_preadv_part(void *bs, int64_t offset, int64_t bytes, unsigned int flags)
 bdrv_co_pwritev_part(void *bs, int64_t offset, int64_t bytes, unsigned int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
 bdrv_co_pwrite_zeroes(void *bs, int64_t offset, int64_t bytes, int flags) "bs %p offset %" PRId64 " bytes %" PRId64 " flags 0x%x"
 bdrv_co_do_copy_on_readv(void *bs, int64_t offset, int64_t bytes, int64_t cluster_offset, int64_t cluster_bytes) "bs %p offset %" PRId64 " bytes %" PRId64 " cluster_offset %" PRId64 " cluster_bytes %" PRId64
-bdrv_co_copy_range_from(void *src, uint64_t src_offset, void *dst, uint64_t dst_offset, uint64_t bytes, int read_flags, int write_flags) "src %p offset %"PRIu64" dst %p offset %"PRIu64" bytes %"PRIu64" rw flags 0x%x 0x%x"
-bdrv_co_copy_range_to(void *src, uint64_t src_offset, void *dst, uint64_t dst_offset, uint64_t bytes, int read_flags, int write_flags) "src %p offset %"PRIu64" dst %p offset %"PRIu64" bytes %"PRIu64" rw flags 0x%x 0x%x"
+bdrv_co_copy_range_from(void *src, int64_t src_offset, void *dst, int64_t dst_offset, int64_t bytes, int read_flags, int write_flags) "src %p offset %" PRId64 " dst %p offset %" PRId64 " bytes %" PRId64 " rw flags 0x%x 0x%x"
+bdrv_co_copy_range_to(void *src, int64_t src_offset, void *dst, int64_t dst_offset, int64_t bytes, int read_flags, int write_flags) "src %p offset %" PRId64 " dst %p offset %" PRId64 " bytes %" PRId64 " rw flags 0x%x 0x%x"
 
 # stream.c
 stream_one_iteration(void *s, int64_t offset, uint64_t bytes, int is_allocated) "s %p offset %" PRId64 " bytes %" PRIu64 " is_allocated %d"