[08/12] block-backend: convert blk_foo wrappers to use int64_t bytes parameter

Commit Message

Vladimir Sementsov-Ogievskiy Oct. 6, 2021, 1:17 p.m. UTC

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 returns 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 <[e-mail]>
---
 include/sysemu/block-backend.h |  6 +++---
 block/block-backend.c          | 10 +++++-----
 2 files changed, 8 insertions(+), 8 deletions(-)

Comments

Eric Blake Oct. 6, 2021, 4:29 p.m. UTC | #1

On Wed, Oct 06, 2021 at 03:17:14PM +0200, Vladimir Sementsov-Ogievskiy wrote:
> 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 returns 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 <[e-mail]>
> ---
>  include/sysemu/block-backend.h |  6 +++---
>  block/block-backend.c          | 10 +++++-----
>  2 files changed, 8 insertions(+), 8 deletions(-)
>

Reviewed-by: Eric Blake <[e-mail]>

Patch

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 398e7abb02..69f5cfb1c5 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -155,7 +155,7 @@  static inline int coroutine_fn blk_co_pwrite(BlockBackend *blk, int64_t offset,
 }
 
 int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
-                      int bytes, BdrvRequestFlags flags);
+                      int64_t bytes, BdrvRequestFlags flags);
 BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                                   int bytes, BdrvRequestFlags flags,
                                   BlockCompletionFunc *cb, void *opaque);
@@ -245,10 +245,10 @@  void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
 int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                                       int64_t bytes, BdrvRequestFlags flags);
 int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
-                          int bytes);
+                          int64_t bytes);
 int blk_truncate(BlockBackend *blk, int64_t offset, bool exact,
                  PreallocMode prealloc, BdrvRequestFlags flags, Error **errp);
-int blk_pdiscard(BlockBackend *blk, int64_t offset, int bytes);
+int blk_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes);
 int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
                      int64_t pos, int size);
 int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size);
diff --git a/block/block-backend.c b/block/block-backend.c
index 403cecea98..018684a203 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;
 
@@ -2180,10 +2180,10 @@  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);
 }