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dbms: Server: In the code managing asynchronous writes, fill with zeroes the portion of the buffer that is eventually truncated in order to keep Valgrind quiet. [#METR-15090]

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This commit is contained in:
Alexey Arno 2015-05-14 01:17:28 +03:00
parent 5d0e5ec60c
commit ce2abcabdd
1 changed files with 7 additions and 0 deletions
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7
dbms/src/IO/WriteBufferAIO.cpp
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@ -338,14 +338,21 @@ void WriteBufferAIO::prepare()
if (read_count < 0)
throw Exception("Read error", ErrorCodes::AIO_READ_ERROR);
Position truncation_begin;
off_t offset = DEFAULT_AIO_FILE_BLOCK_SIZE - region_right_padding;
if (read_count > offset)
{
::memcpy(buffer_end, memory_page + offset, read_count - offset);
truncation_begin = buffer_end + (read_count - offset);
truncation_count = DEFAULT_AIO_FILE_BLOCK_SIZE - read_count;
}
else
{
truncation_begin = buffer_end;
truncation_count = region_right_padding;
}
::memset(truncation_begin, 0, truncation_count);
}
}
}