mdadm-1.7.0mdadm-1.7.0

1 files changed, 192 insertions, 0 deletions

diff --git a/Grow.c b/Grow.c
new file mode 100644
index 00000000..82283bc8
--- /dev/null
+++ b/Grow.c
@@ -0,0 +1,192 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
+ *
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *    Author: Neil Brown
+ *    Email: <neilb@cse.unsw.edu.au>
+ *    Paper: Neil Brown
+ *           School of Computer Science and Engineering
+ *           The University of New South Wales
+ *           Sydney, 2052
+ *           Australia
+ */
+#include	"mdadm.h"
+#include	"dlink.h"
+
+#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
+#error no endian defined
+#endif
+#include	"md_u.h"
+#include	"md_p.h"
+
+int Grow_Add_device(char *devname, int fd, char *newdev)
+{
+	/* Add a device to an active array.
+	 * Currently, just extend a linear array.
+	 * This requires writing a new superblock on the
+	 * new device, calling the kernel to add the device,
+	 * and if that succeeds, update the superblock on
+	 * all other devices.
+	 * This means that we need to *find* all other devices.
+	 */
+	mdu_array_info_t array;
+	mdu_disk_info_t disk;
+	mdp_super_t super;
+	struct stat stb;
+	int nfd, fd2;
+	int d, nd;
+	
+
+	if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
+		fprintf(stderr, Name ": cannot get array info for %s\n", devname);
+		return 1;
+	}
+
+	if (array.level != -1) {
+		fprintf(stderr, Name ": can only add devices to linear arrays\n");
+		return 1;
+	}
+
+	nfd = open(newdev, O_RDWR|O_EXCL);
+	if (nfd < 0) {
+		fprintf(stderr, Name ": cannot open %s\n", newdev);
+		return 1;
+	}
+	fstat(nfd, &stb);
+	if ((stb.st_mode & S_IFMT) != S_IFBLK) {
+		fprintf(stderr, Name ": %s is not a block device!\n", newdev);
+		close(nfd);
+		return 1;
+	}
+	/* now check out all the devices and make sure we can read the superblock */
+	for (d=0 ; d < array.raid_disks ; d++) {
+		mdu_disk_info_t disk;
+		char *dv;
+
+		disk.number = d;
+		if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
+			fprintf(stderr, Name ": cannot get device detail for device %d\n",
+				d);
+			return 1;
+		}
+		dv = map_dev(disk.major, disk.minor);
+		if (!dv) {
+			fprintf(stderr, Name ": cannot find device file for device %d\n",
+				d);
+			return 1;
+		}
+		fd2 = open(dv, O_RDWR);
+		if (!fd2) {
+			fprintf(stderr, Name ": cannot open device file %s\n", dv);
+			return 1;
+		}
+		if (load_super(fd2, &super)) {
+			fprintf(stderr, Name ": cannot find super block on %s\n", dv);
+			close(fd2);
+			return 1;
+		}
+		close(fd2);
+	}
+	/* Ok, looks good. Lets update the superblock and write it out to
+	 * newdev.
+	 */
+	
+	memset(&super.disks[d], 0, sizeof(super.disks[d]));
+	super.disks[d].number = d;
+	super.disks[d].major = MAJOR(stb.st_rdev);
+	super.disks[d].minor = MINOR(stb.st_rdev);
+	super.disks[d].raid_disk = d;
+	super.disks[d].state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
+
+	super.this_disk = super.disks[d];
+	super.sb_csum = calc_sb_csum(&super);
+	if (store_super(nfd, &super)) {
+		fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev);
+		close(nfd);
+		return 1;
+	}
+	disk.number = d;
+	disk.major = MAJOR(stb.st_rdev);
+	disk.minor = MINOR(stb.st_rdev);
+	disk.raid_disk = d;
+	disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
+	close(nfd);
+	if (ioctl(fd, ADD_NEW_DISK, &disk) != 0) {
+		fprintf(stderr, Name ": Cannot add new disk to this array\n");
+		return 1;
+	}
+	/* Well, that seems to have worked.
+	 * Now go through and update all superblocks
+	 */
+
+	if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
+		fprintf(stderr, Name ": cannot get array info for %s\n", devname);
+		return 1;
+	}
+
+	nd = d;
+	for (d=0 ; d < array.raid_disks ; d++) {
+		mdu_disk_info_t disk;
+		char *dv;
+
+		disk.number = d;
+		if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
+			fprintf(stderr, Name ": cannot get device detail for device %d\n",
+				d);
+			return 1;
+		}
+		dv = map_dev(disk.major, disk.minor);
+		if (!dv) {
+			fprintf(stderr, Name ": cannot find device file for device %d\n",
+				d);
+			return 1;
+		}
+		fd2 = open(dv, O_RDWR);
+		if (fd2 < 0) {
+			fprintf(stderr, Name ": cannot open device file %s\n", dv);
+			return 1;
+		}
+		if (load_super(fd2, &super)) {
+			fprintf(stderr, Name ": cannot find super block on %s\n", dv);
+			close(fd);
+			return 1;
+		}
+		super.raid_disks = nd+1;
+		super.nr_disks = nd+1;
+		super.active_disks = nd+1;
+		super.working_disks = nd+1;
+		memset(&super.disks[nd], 0, sizeof(super.disks[nd]));
+		super.disks[nd].number = nd;
+		super.disks[nd].major = MAJOR(stb.st_rdev);
+		super.disks[nd].minor = MINOR(stb.st_rdev);
+		super.disks[nd].raid_disk = nd;
+		super.disks[nd].state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
+
+		super.this_disk = super.disks[d];
+		super.sb_csum = calc_sb_csum(&super);
+		if (store_super(fd2, &super)) {
+			fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
+			close(fd2);
+			return 1;
+		}
+		close(fd2);
+	}
+
+	return 0;
+}