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block: Make bdrv_{pread,pwrite}() return 0 on success

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They currently return the value of their 'bytes' parameter on success.

Make them return 0 instead, for consistency with other I/O functions and
in preparation to implement them using generated_co_wrapper. This also
makes it clear that short reads/writes are not possible.

The few callers that rely on the previous behavior are adjusted
accordingly by hand.

Signed-off-by: Alberto Faria <afaria@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20220609152744.3891847-4-afaria@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
This commit is contained in:
Alberto Faria 2022-06-09 16:27:37 +01:00 • committed by Hanna Reitz
parent 32cc71def9
commit 353a5d84b2
10 changed files with 19 additions and 31 deletions
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2
block/vdi.c
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@ -730,7 +730,7 @@ nonallocating_write:
n_sectors * SECTOR_SIZE, base, 0);
}
return ret < 0 ? ret : 0;
return ret;
}
static int coroutine_fn vdi_co_do_create(BlockdevCreateOptions *create_options,