We want to test fiemap, so we want to lay out a file exactly a certain way. XFS
tries to be smart and will allocate data in a hole if the write pattern is
[data][hole][data]
where the hole is small enough. This screws with fiemap-tester sometimes, so
make it easy and just do O_DIRECT so that we get the layout we want and can get
back to testing fiemap. Thanks,
Signed-off-by: Josef Bacik <jbacik@xxxxxx>
---
src/fiemap-tester.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/src/fiemap-tester.c b/src/fiemap-tester.c
index 8e633ab..5cb58fc 100644
--- a/src/fiemap-tester.c
+++ b/src/fiemap-tester.c
@@ -92,8 +92,7 @@ create_file_from_mapping(int fd, char *map, int blocks, int blocksize)
int i = 0;
bufsize = sizeof(char) * blocksize;
- buf = malloc(bufsize);
- if (!buf)
+ if (posix_memalign((void **)&buf, 4096, bufsize))
return -1;
memset(buf, 'a', bufsize);
@@ -562,7 +561,7 @@ main(int argc, char **argv)
if (!fname)
usage();
- fd = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0644);
+ fd = open(fname, O_RDWR|O_CREAT|O_TRUNC|O_DIRECT, 0644);
if (fd < 0) {
perror("Can't open file");
exit(1);
--
2.1.0
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