Add a 'super-switch' so that different format superblocks can be used.
[thirdparty/mdadm.git] / Grow.c
CommitLineData
e5329c37
NB
1/*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Author: Neil Brown
22 * Email: <neilb@cse.unsw.edu.au>
23 * Paper: Neil Brown
24 * School of Computer Science and Engineering
25 * The University of New South Wales
26 * Sydney, 2052
27 * Australia
28 */
29#include "mdadm.h"
30#include "dlink.h"
31
32#if ! defined(__BIG_ENDIAN) && ! defined(__LITTLE_ENDIAN)
33#error no endian defined
34#endif
35#include "md_u.h"
36#include "md_p.h"
37
38int Grow_Add_device(char *devname, int fd, char *newdev)
39{
40 /* Add a device to an active array.
41 * Currently, just extend a linear array.
42 * This requires writing a new superblock on the
43 * new device, calling the kernel to add the device,
44 * and if that succeeds, update the superblock on
45 * all other devices.
46 * This means that we need to *find* all other devices.
47 */
4b1ac34b
NB
48 struct mdinfo info;
49
50 void *super = NULL;
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NB
51 struct stat stb;
52 int nfd, fd2;
53 int d, nd;
f9ce90ba 54 struct superswitch *ss = NULL;
e5329c37
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55
56
4b1ac34b 57 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
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58 fprintf(stderr, Name ": cannot get array info for %s\n", devname);
59 return 1;
60 }
61
f9ce90ba
NB
62 ss = super_by_version(info.array.major_version);
63 if (!ss) {
64 fprintf(stderr, Name ": cannot handle arrays with superblock version %d\n", info.array.major_version);
65 return 1;
66 }
67
4b1ac34b 68 if (info.array.level != -1) {
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NB
69 fprintf(stderr, Name ": can only add devices to linear arrays\n");
70 return 1;
71 }
72
73 nfd = open(newdev, O_RDWR|O_EXCL);
74 if (nfd < 0) {
75 fprintf(stderr, Name ": cannot open %s\n", newdev);
76 return 1;
77 }
78 fstat(nfd, &stb);
79 if ((stb.st_mode & S_IFMT) != S_IFBLK) {
80 fprintf(stderr, Name ": %s is not a block device!\n", newdev);
81 close(nfd);
82 return 1;
83 }
84 /* now check out all the devices and make sure we can read the superblock */
4b1ac34b 85 for (d=0 ; d < info.array.raid_disks ; d++) {
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NB
86 mdu_disk_info_t disk;
87 char *dv;
88
89 disk.number = d;
90 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
91 fprintf(stderr, Name ": cannot get device detail for device %d\n",
92 d);
93 return 1;
94 }
95 dv = map_dev(disk.major, disk.minor);
96 if (!dv) {
97 fprintf(stderr, Name ": cannot find device file for device %d\n",
98 d);
99 return 1;
100 }
101 fd2 = open(dv, O_RDWR);
102 if (!fd2) {
103 fprintf(stderr, Name ": cannot open device file %s\n", dv);
104 return 1;
105 }
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NB
106 if (super) free(super);
107 super= NULL;
f9ce90ba 108 if (ss->load_super(fd2, &super, NULL)) {
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NB
109 fprintf(stderr, Name ": cannot find super block on %s\n", dv);
110 close(fd2);
111 return 1;
112 }
113 close(fd2);
114 }
115 /* Ok, looks good. Lets update the superblock and write it out to
116 * newdev.
117 */
118
4b1ac34b
NB
119 info.disk.number = d;
120 info.disk.major = major(stb.st_rdev);
121 info.disk.minor = minor(stb.st_rdev);
122 info.disk.raid_disk = d;
123 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
f9ce90ba 124 ss->update_super(&info, super, "grow", newdev, 0);
e5329c37 125
f9ce90ba 126 if (ss->store_super(nfd, super)) {
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NB
127 fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev);
128 close(nfd);
129 return 1;
130 }
e5329c37 131 close(nfd);
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NB
132
133 if (ioctl(fd, ADD_NEW_DISK, &info.disk) != 0) {
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NB
134 fprintf(stderr, Name ": Cannot add new disk to this array\n");
135 return 1;
136 }
137 /* Well, that seems to have worked.
138 * Now go through and update all superblocks
139 */
140
4b1ac34b 141 if (ioctl(fd, GET_ARRAY_INFO, &info.array) < 0) {
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NB
142 fprintf(stderr, Name ": cannot get array info for %s\n", devname);
143 return 1;
144 }
145
146 nd = d;
4b1ac34b 147 for (d=0 ; d < info.array.raid_disks ; d++) {
e5329c37
NB
148 mdu_disk_info_t disk;
149 char *dv;
150
151 disk.number = d;
152 if (ioctl(fd, GET_DISK_INFO, &disk) < 0) {
153 fprintf(stderr, Name ": cannot get device detail for device %d\n",
154 d);
155 return 1;
156 }
157 dv = map_dev(disk.major, disk.minor);
158 if (!dv) {
159 fprintf(stderr, Name ": cannot find device file for device %d\n",
160 d);
161 return 1;
162 }
163 fd2 = open(dv, O_RDWR);
164 if (fd2 < 0) {
165 fprintf(stderr, Name ": cannot open device file %s\n", dv);
166 return 1;
167 }
f9ce90ba 168 if (ss->load_super(fd2, &super, NULL)) {
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NB
169 fprintf(stderr, Name ": cannot find super block on %s\n", dv);
170 close(fd);
171 return 1;
172 }
4b1ac34b
NB
173 info.array.raid_disks = nd+1;
174 info.array.nr_disks = nd+1;
175 info.array.active_disks = nd+1;
176 info.array.working_disks = nd+1;
177 info.disk.number = nd;
178 info.disk.major = major(stb.st_rdev);
179 info.disk.minor = minor(stb.st_rdev);
180 info.disk.raid_disk = nd;
181 info.disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE);
f9ce90ba 182 ss->update_super(&info, super, "grow", dv, 0);
4b1ac34b 183
f9ce90ba 184 if (ss->store_super(fd2, super)) {
e5329c37
NB
185 fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv);
186 close(fd2);
187 return 1;
188 }
189 close(fd2);
190 }
191
192 return 0;
193}