linux-kernel - [PATCH 1/1] extendpart: A new command line to extend an existing partition

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Date:	Thu,  1 Sep 2011 17:55:28 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	linux-kernel@...r.kernel.org, jaxboe@...ionio.com,
	dm-devel@...hat.com
Cc:	kzak@...hat.com, vgoyal@...hat.com
Subject: [PATCH 1/1] extendpart: A new command line to extend an existing partition

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@...hat.com>
---
 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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