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block: Make blk_{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.

Signed-off-by: Alberto Faria <afaria@redhat.com>
Message-Id: <20220705161527.1054072-2-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 2022-07-05 17:15:09 +01:00 • committed by Hanna Reitz
parent 92529251d2
commit bf5b16fa40
12 changed files with 49 additions and 51 deletions
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4
tests/unit/test-block-iothread.c
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@ -117,7 +117,7 @@ static void test_sync_op_blk_pread(BlockBackend *blk)
/* Success */
ret = blk_pread(blk, 0, buf, sizeof(buf));
g_assert_cmpint(ret, ==, 512);
g_assert_cmpint(ret, ==, 0);
/* Early error: Negative offset */
ret = blk_pread(blk, -2, buf, sizeof(buf));
@ -131,7 +131,7 @@ static void test_sync_op_blk_pwrite(BlockBackend *blk)
/* Success */
ret = blk_pwrite(blk, 0, buf, sizeof(buf), 0);
g_assert_cmpint(ret, ==, 512);
g_assert_cmpint(ret, ==, 0);
/* Early error: Negative offset */
ret = blk_pwrite(blk, -2, buf, sizeof(buf), 0);