Thread (11 messages) 11 messages, 3 authors, 2018-10-26

Re: [PATCH 1/2] loop/006: Add test for setting partscan flag

From: Omar Sandoval <osandov@osandov.com>
Date: 2018-10-23 07:13:28

On Thu, Oct 18, 2018 at 12:31:46PM +0200, Jan Kara wrote:
Add test for setting partscan flag.

Signed-off-by: Jan Kara <jack@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?
quoted hunk ↗ jump to hunk
---
 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]
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