diff options
Diffstat (limited to 'src/ceph/qa/workunits/direct_io/test_short_dio_read.c')
-rw-r--r-- | src/ceph/qa/workunits/direct_io/test_short_dio_read.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/ceph/qa/workunits/direct_io/test_short_dio_read.c b/src/ceph/qa/workunits/direct_io/test_short_dio_read.c new file mode 100644 index 0000000..5024855 --- /dev/null +++ b/src/ceph/qa/workunits/direct_io/test_short_dio_read.c @@ -0,0 +1,57 @@ +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> + +int main() +{ + char buf[409600]; + ssize_t r; + int err; + int fd = open("shortfile", O_WRONLY|O_CREAT, 0644); + + if (fd < 0) { + err = errno; + printf("error: open() failed with: %d (%s)\n", err, strerror(err)); + exit(err); + } + + printf("writing first 3 bytes of 10k file\n"); + r = write(fd, "foo", 3); + if (r == -1) { + err = errno; + printf("error: write() failed with: %d (%s)\n", err, strerror(err)); + close(fd); + exit(err); + } + r = ftruncate(fd, 10000); + if (r == -1) { + err = errno; + printf("error: ftruncate() failed with: %d (%s)\n", err, strerror(err)); + close(fd); + exit(err); + } + + fsync(fd); + close(fd); + + printf("reading O_DIRECT\n"); + fd = open("shortfile", O_RDONLY|O_DIRECT); + if (fd < 0) { + err = errno; + printf("error: open() failed with: %d (%s)\n", err, strerror(err)); + exit(err); + } + + r = read(fd, buf, sizeof(buf)); + close(fd); + + printf("got %d\n", (int)r); + if (r != 10000) + return 1; + return 0; +} |