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Subject[PATCH 2/2] resizepart: Utility to resize a partition
Date
A simple user space utility to resize an existing partition.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
---
partx/Makefile.am | 4 ++--
partx/partx.h | 19 +++++++++++++++++++
partx/resizepart.8 | 38 ++++++++++++++++++++++++++++++++++++++
partx/resizepart.c | 30 ++++++++++++++++++++++++++++++
4 files changed, 89 insertions(+), 2 deletions(-)
create mode 100644 partx/resizepart.8
create mode 100644 partx/resizepart.c
diff --git a/partx/Makefile.am b/partx/Makefile.am
index 080bc47..1f4dbf5 100644
--- a/partx/Makefile.am
+++ b/partx/Makefile.am
@@ -1,7 +1,7 @@
include $(top_srcdir)/config/include-Makefile.am

-usrsbin_exec_PROGRAMS = addpart delpart
-dist_man_MANS = addpart.8 delpart.8
+usrsbin_exec_PROGRAMS = addpart delpart resizepart
+dist_man_MANS = addpart.8 delpart.8 resizepart.8

usrsbin_exec_PROGRAMS += partx
partx_SOURCES = partx.c partx.h \
diff --git a/partx/partx.h b/partx/partx.h
index b40fa8f..7a509f3 100644
--- a/partx/partx.h
+++ b/partx/partx.h
@@ -41,4 +41,23 @@ static inline int partx_add_partition(int fd, int partno,
return ioctl(fd, BLKPG, &a);
}

+static inline int partx_resize_partition(int fd, int partno, unsigned long size)
+{
+ struct blkpg_ioctl_arg a;
+ struct blkpg_partition p;
+
+ p.pno = partno;
+ /* start is unused for resize operation. It can't be changed */
+ p.start = 0;
+ p.length = size << 9;
+ p.devname[0] = 0;
+ p.volname[0] = 0;
+ a.op = BLKPG_RESIZE_PARTITION;
+ a.flags = 0;
+ a.datalen = sizeof(p);
+ a.data = &p;
+
+ return ioctl(fd, BLKPG, &a);
+}
+
#endif /* UTIL_LINUX_PARTX_H */
diff --git a/partx/resizepart.8 b/partx/resizepart.8
new file mode 100644
index 0000000..0b47e81
--- /dev/null
+++ b/partx/resizepart.8
@@ -0,0 +1,38 @@
+.\" resizepart.8 --
+.\" Copyright 2012 Vivek Goyal <vgoyal@redhat.com>
+.\" Copyright 2012 Red Hat, Inc.
+.\" May be distributed under the GNU General Public License
+.TH RESIZEPART 8 "February 2012" "util-linux" "System Administration"
+.SH NAME
+resizepart \-
+simple wrapper around the "resize partition" ioctl
+.SH SYNOPSIS
+.B resizepart
+.I device partition length
+.SH DESCRIPTION
+.B resizepart
+is a program that informs the Linux kernel of new partition size.
+
+This command doesn't manipulate partitions on hard drive.
+
+.SH PARAMETERS
+.TP
+.I device
+Specify the disk device.
+.TP
+.I partition
+Specify the partition number.
+.TP
+.I length
+Specify the length of the partition (in 512-byte sectors).
+
+.SH SEE ALSO
+.BR addpart (8),
+.BR delpart (8),
+.BR fdisk (8),
+.BR parted (8),
+.BR partprobe (8),
+.BR partx (8)
+.SH AVAILABILITY
+The addpart command is part of the util-linux package and is available from
+ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
diff --git a/partx/resizepart.c b/partx/resizepart.c
new file mode 100644
index 0000000..e230fcd
--- /dev/null
+++ b/partx/resizepart.c
@@ -0,0 +1,30 @@
+#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 length\n",
+ argv[0]);
+ exit(1);
+ }
+ if ((fd = open(argv[1], O_RDONLY)) < 0) {
+ perror(argv[1]);
+ exit(1);
+ }
+
+ if (partx_resize_partition(fd, atoi(argv[2]),
+ atoll(argv[3]))) {
+ perror("BLKPG");
+ exit(1);
+ }
+
+ return 0;
+}
--
1.7.6.4


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