Re: [PATCH 1/3] block: use int64_t as bytes type in tracked requests

[Kevin Wolf <kwolf@redhat.com>]

Am 30.03.2020 um 16:18 hat Vladimir Sementsov-Ogievskiy geschrieben:
> We are generally moving to int64_t for both offset and bytes paramaters
> on all io paths. Convert tracked requests now.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  include/block/block_int.h |  4 ++--
>  block/io.c                | 11 ++++++-----
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/include/block/block_int.h b/include/block/block_int.h
> index 4c3587ea19..c8daba608b 100644
> --- a/include/block/block_int.h
> +++ b/include/block/block_int.h
> @@ -70,12 +70,12 @@ enum BdrvTrackedRequestType {
>  typedef struct BdrvTrackedRequest {
>      BlockDriverState *bs;
>      int64_t offset;
> -    uint64_t bytes;
> +    int64_t bytes;
>      enum BdrvTrackedRequestType type;
>  
>      bool serialising;
>      int64_t overlap_offset;
> -    uint64_t overlap_bytes;
> +    int64_t overlap_bytes;
>  
>      QLIST_ENTRY(BdrvTrackedRequest) list;
>      Coroutine *co; /* owner, used for deadlock detection */
> diff --git a/block/io.c b/block/io.c
> index aba67f66b9..7cbb80bd24 100644
> --- a/block/io.c
> +++ b/block/io.c
> @@ -692,10 +692,11 @@ static void tracked_request_end(BdrvTrackedRequest *req)
>  static void tracked_request_begin(BdrvTrackedRequest *req,
>                                    BlockDriverState *bs,
>                                    int64_t offset,
> -                                  uint64_t bytes,
> +                                  int64_t bytes,
>                                    enum BdrvTrackedRequestType type)
>  {
> -    assert(bytes <= INT64_MAX && offset <= INT64_MAX - bytes);
> +    assert(offset >= 0 && bytes >= 0 &&
> +           bytes <= INT64_MAX && offset <= INT64_MAX - bytes);
>  
>      *req = (BdrvTrackedRequest){
>          .bs = bs,
> @@ -716,7 +717,7 @@ static void tracked_request_begin(BdrvTrackedRequest *req,
>  }
>  
>  static bool tracked_request_overlaps(BdrvTrackedRequest *req,
> -                                     int64_t offset, uint64_t bytes)
> +                                     int64_t offset, int64_t bytes)
>  {
>      /*        aaaa   bbbb */
>      if (offset >= req->overlap_offset + req->overlap_bytes) {
> @@ -773,8 +774,8 @@ bool bdrv_mark_request_serialising(BdrvTrackedRequest *req, uint64_t align)
>  {
>      BlockDriverState *bs = req->bs;
>      int64_t overlap_offset = req->offset & ~(align - 1);
> -    uint64_t overlap_bytes = ROUND_UP(req->offset + req->bytes, align)
> -                               - overlap_offset;
> +    int64_t overlap_bytes =
> +            ROUND_UP(req->offset + req->bytes, align) - overlap_offset;

An indentation with 8 spaces is unconventional in QEMU.

Kevin