This is along the lines of addpart and delpart to modify in kernel partition
table and does not touch the ondisk data structures.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
---
partx/Makefile.am | 2 +-
partx/extendpart.c | 29 +++++++++++++++++++++++++++++
partx/partx.h | 20 ++++++++++++++++++++
3 files changed, 50 insertions(+), 1 deletions(-)
create mode 100644 partx/extendpart.c
diff --git a/partx/Makefile.am b/partx/Makefile.am
index 6a72942..f84126d 100644
--- a/partx/Makefile.am
+++ b/partx/Makefile.am
@@ -1,6 +1,6 @@
include $(top_srcdir)/config/include-Makefile.am
-usrsbin_exec_PROGRAMS = addpart delpart
+usrsbin_exec_PROGRAMS = addpart delpart extendpart
dist_man_MANS = addpart.8 delpart.8
usrsbin_exec_PROGRAMS += partx
diff --git a/partx/extendpart.c b/partx/extendpart.c
new file mode 100644
index 0000000..a9577c2
--- /dev/null
+++ b/partx/extendpart.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+#include "partx.h"
+
+int
+main(int argc, char **argv)
+{
+ int fd;
+
+ if (argc != 4) {
+ fprintf(stderr,
+ "usage: %s diskdevice partitionnr size\n",
+ argv[0]);
+ exit(1);
+ }
+ if ((fd = open(argv[1], O_RDONLY)) < 0) {
+ perror(argv[1]);
+ exit(1);
+ }
+
+ if (partx_extend_partition(fd, atoi(argv[2]), atoll(argv[3]))) {
+ perror("BLKPG");
+ exit(1);
+ }
+
+ return 0;
+}
diff --git a/partx/partx.h b/partx/partx.h
index b40fa8f..1acbff9 100644
--- a/partx/partx.h
+++ b/partx/partx.h
@@ -41,4 +41,24 @@ static inline int partx_add_partition(int fd, int partno,
return ioctl(fd, BLKPG, &a);
}
+static inline int partx_extend_partition(int fd, int partno,
+ unsigned long size)
+{
+ struct blkpg_ioctl_arg a;
+ struct blkpg_partition p;
+
+ p.pno = partno;
+ /* p.start is unused for extend operation */
+ p.start = 0;
+ p.length = size << 9;
+ p.devname[0] = 0;
+ p.volname[0] = 0;
+ a.op = BLKPG_EXTEND_PARTITION;
+ a.flags = 0;
+ a.datalen = sizeof(p);
+ a.data = &p;
+
+ return ioctl(fd, BLKPG, &a);
+}
+
#endif /* UTIL_LINUX_PARTX_H */
--
1.7.6
--
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