On Thu, Oct 18, 2018 at 12:31:46PM +0200, Jan Kara wrote:
> Add test for setting partscan flag.
>
> Signed-off-by: Jan Kara <j...@suse.cz>
Sorry I didn't notice this earlier, but loop/001 already does a
partition rescan (via losetup -P). Does that cover this test case?
> ---
> src/Makefile | 3 ++-
> src/loop_set_status_partscan.c | 45
> ++++++++++++++++++++++++++++++++++++++++++
> tests/loop/006 | 33 +++++++++++++++++++++++++++++++
> tests/loop/006.out | 2 ++
> 4 files changed, 82 insertions(+), 1 deletion(-)
> create mode 100644 src/loop_set_status_partscan.c
> create mode 100755 tests/loop/006
> create mode 100644 tests/loop/006.out
>
> diff --git a/src/Makefile b/src/Makefile
> index f89f61701179..6dadcbec8beb 100644
> --- a/src/Makefile
> +++ b/src/Makefile
> @@ -4,7 +4,8 @@ C_TARGETS := \
> openclose \
> sg/dxfer-from-dev \
> sg/syzkaller1 \
> - nbdsetsize
> + nbdsetsize \
> + loop_set_status_partscan
>
> CXX_TARGETS := \
> discontiguous-io
> diff --git a/src/loop_set_status_partscan.c b/src/loop_set_status_partscan.c
> new file mode 100644
> index 000000000000..8873a12e4334
> --- /dev/null
> +++ b/src/loop_set_status_partscan.c
> @@ -0,0 +1,45 @@
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <sys/ioctl.h>
> +#include <sys/stat.h>
> +#include <sys/types.h>
> +#include <linux/loop.h>
> +
> +void usage(const char *progname)
> +{
> + fprintf(stderr, "usage: %s PATH\n", progname);
> + exit(EXIT_FAILURE);
> +}
> +
> +int main(int argc, char **argv)
> +{
> + int ret;
> + int fd;
> + struct loop_info64 info;
> +
> + if (argc != 2)
> + usage(argv[0]);
> +
> + fd = open(argv[1], O_RDONLY);
> + if (fd == -1) {
> + perror("open");
> + return EXIT_FAILURE;
> + }
> +
> + memset(&info, 0, sizeof(info));
> + info.lo_flags = LO_FLAGS_PARTSCAN;
> + memcpy(info.lo_file_name, "part", 5);
What's the significance of this file name?
> + ret = ioctl(fd, LOOP_SET_STATUS64, &info);
> + if (ret == -1) {
> + perror("ioctl");
> + close(fd);
> + return EXIT_FAILURE;
> + }
> + close(fd);
> + return EXIT_SUCCESS;
> +}
[snip]
