[PULL,03/15] block-backend: make blk_co_preadv() 64bit

Commit Message

Eric Blake Oct. 15, 2021, 9:09 p.m. UTC

From: Vladimir Sementsov-Ogievskiy <[e-mail]>

For both updated functions, the type of bytes becomes wider, so all callers
should be OK with it.

blk_co_preadv() only passes its arguments to blk_do_preadv().

blk_do_preadv() passes bytes to:

 - trace_blk_co_preadv, which is updated too
 - blk_check_byte_request, throttle_group_co_io_limits_intercept,
   bdrv_co_preadv, which are already int64_t.

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

Signed-off-by: Vladimir Sementsov-Ogievskiy <[e-mail]>
Message-Id: <[e-mail]>
Reviewed-by: Eric Blake <[e-mail]>
[eblake: grammar tweaks]
Signed-off-by: Eric Blake <[e-mail]>
---
 include/sysemu/block-backend.h | 2 +-
 block/block-backend.c          | 4 ++--
 block/trace-events             | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

Patch

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 82bae551617b..442fd705bb78 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -126,7 +126,7 @@  BlockBackend *blk_by_dev(void *dev);
 BlockBackend *blk_by_qdev_id(const char *id, Error **errp);
 void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
 int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
-                               unsigned int bytes, QEMUIOVector *qiov,
+                               int64_t bytes, QEMUIOVector *qiov,
                                BdrvRequestFlags flags);
 int coroutine_fn blk_co_pwritev_part(BlockBackend *blk, int64_t offset,
                                      unsigned int bytes,
diff --git a/block/block-backend.c b/block/block-backend.c
index 2c62210687e7..3199f84e96d9 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1205,7 +1205,7 @@  static void coroutine_fn blk_wait_while_drained(BlockBackend *blk)

 /* To be called between exactly one pair of blk_inc/dec_in_flight() */
 static int coroutine_fn
-blk_do_preadv(BlockBackend *blk, int64_t offset, unsigned int bytes,
+blk_do_preadv(BlockBackend *blk, int64_t offset, int64_t bytes,
               QEMUIOVector *qiov, BdrvRequestFlags flags)
 {
     int ret;
@@ -1236,7 +1236,7 @@  blk_do_preadv(BlockBackend *blk, int64_t offset, unsigned int bytes,
 }

 int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
-                               unsigned int bytes, QEMUIOVector *qiov,
+                               int64_t bytes, QEMUIOVector *qiov,
                                BdrvRequestFlags flags)
 {
     int ret;
diff --git a/block/trace-events b/block/trace-events
index f2d0a9b62a7e..ff397ffff485 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -5,7 +5,7 @@  bdrv_open_common(void *bs, const char *filename, int flags, const char *format_n
 bdrv_lock_medium(void *bs, bool locked) "bs %p locked %d"

 # block-backend.c
-blk_co_preadv(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x"
+blk_co_preadv(void *blk, void *bs, int64_t offset, int64_t bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %" PRId64 " flags 0x%x"
 blk_co_pwritev(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x"
 blk_root_attach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
 blk_root_detach(void *child, void *blk, void *bs) "child %p blk %p bs %p"