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fiemap-tester: convert to use O_DIRECT

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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@fb.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Josef Bacik
2015-08-04 14:10:48 +10:00
committed by Dave Chinner
parent 4712000ada
commit 0372c9fef9
1 changed files with 2 additions and 3 deletions
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src/fiemap-tester.c
+2 -3
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@@ -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);