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qa: test_sync_io: zero buffers prior to read

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Be extra paranoid to ensure we read back the correct data and didn't
just find it in undefined memory.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2011-06-13 16:23:28 -07:00
parent d89c9a1303
commit 8ce98b22de
1 changed files with 4 additions and 0 deletions
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4
qa/workunits/direct_io/test_sync_io.c
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@ -64,6 +64,7 @@ int read_direct(int buf_align, uint64_t offset, int len)
void *rawbuf;
posix_memalign(&rawbuf, 4096, len + buf_align);
void *buf = (char *)rawbuf + buf_align;
memset(buf, 0, len);
pread(fd, buf, len, offset);
close(fd);
int r = verify_pattern(buf, len, offset);
@ -79,6 +80,7 @@ int read_sync(int buf_align, uint64_t offset, int len)
void *rawbuf;
posix_memalign(&rawbuf, 4096, len + buf_align);
void *buf = (char *)rawbuf + buf_align;
memset(buf, 0, len);
pread(fd, buf, len, offset);
close(fd);
int r = verify_pattern(buf, len, offset);
@ -101,6 +103,7 @@ int write_direct(int buf_align, uint64_t offset, int len)
fd = open("foo", O_RDONLY);
void *buf2 = malloc(len);
memset(buf2, 0, len);
pread(fd, buf2, len, offset);
close(fd);
@ -128,6 +131,7 @@ int write_sync(int buf_align, uint64_t offset, int len)
fd = open("foo", O_RDONLY);
void *buf2 = malloc(len);
memset(buf2, 0, len);
pread(fd, buf2, len, offset);
close(fd);