block-backend: convert blk_foo wrappers to use int64_t bytes parameter

Convert blk_pdiscard, blk_pwrite_compressed, blk_pwrite_zeroes.
These are just wrappers for functions with int64_t argument, so allow
passing int64_t as well. Parameter type becomes wider so all callers
should be OK with it.

Note that requests exceeding INT_MAX are still restricted by
blk_check_byte_request().

Note also that we don't (and are not going to) convert blk_pwrite and
blk_pread: these functions return number of bytes on success, so to
update them, we should change return type to int64_t as well, which
will lead to investigating and updating all callers which is too much.

So, blk_pread and blk_pwrite remain unchanged.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20211006131718.214235-9-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: grammar tweaks]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/block/block-backend.c b/block/block-backend.c
index 2e6ccce..ee20ae5 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1330,7 +1330,7 @@ typedef struct BlkRwCo {
 } BlkRwCo;
 
 int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
-                      int bytes, BdrvRequestFlags flags)
+                      int64_t bytes, BdrvRequestFlags flags)
 {
     return blk_pwritev_part(blk, offset, bytes, NULL, 0,
                             flags | BDRV_REQ_ZERO_WRITE);
@@ -1637,7 +1637,7 @@ int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset,
     return ret;
 }
 
-int blk_pdiscard(BlockBackend *blk, int64_t offset, int bytes)
+int blk_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes)
 {
     int ret;
 
@@ -2186,10 +2186,10 @@ int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
 }
 
 int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
-                          int count)
+                          int64_t bytes)
 {
-    QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, count);
-    return blk_pwritev_part(blk, offset, count, &qiov, 0,
+    QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
+    return blk_pwritev_part(blk, offset, bytes, &qiov, 0,
                             BDRV_REQ_WRITE_COMPRESSED);
 }