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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 | ||
38 | int 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 | */ | |
48 | mdu_array_info_t array; | |
49 | mdu_disk_info_t disk; | |
50 | mdp_super_t super; | |
51 | struct stat stb; | |
52 | int nfd, fd2; | |
53 | int d, nd; | |
54 | ||
55 | ||
56 | if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) { | |
57 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); | |
58 | return 1; | |
59 | } | |
60 | ||
61 | if (array.level != -1) { | |
62 | fprintf(stderr, Name ": can only add devices to linear arrays\n"); | |
63 | return 1; | |
64 | } | |
65 | ||
66 | nfd = open(newdev, O_RDWR|O_EXCL); | |
67 | if (nfd < 0) { | |
68 | fprintf(stderr, Name ": cannot open %s\n", newdev); | |
69 | return 1; | |
70 | } | |
71 | fstat(nfd, &stb); | |
72 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
73 | fprintf(stderr, Name ": %s is not a block device!\n", newdev); | |
74 | close(nfd); | |
75 | return 1; | |
76 | } | |
77 | /* now check out all the devices and make sure we can read the superblock */ | |
78 | for (d=0 ; d < array.raid_disks ; d++) { | |
79 | mdu_disk_info_t disk; | |
80 | char *dv; | |
81 | ||
82 | disk.number = d; | |
83 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
84 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
85 | d); | |
86 | return 1; | |
87 | } | |
88 | dv = map_dev(disk.major, disk.minor); | |
89 | if (!dv) { | |
90 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
91 | d); | |
92 | return 1; | |
93 | } | |
94 | fd2 = open(dv, O_RDWR); | |
95 | if (!fd2) { | |
96 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
97 | return 1; | |
98 | } | |
99 | if (load_super(fd2, &super)) { | |
100 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); | |
101 | close(fd2); | |
102 | return 1; | |
103 | } | |
104 | close(fd2); | |
105 | } | |
106 | /* Ok, looks good. Lets update the superblock and write it out to | |
107 | * newdev. | |
108 | */ | |
109 | ||
110 | memset(&super.disks[d], 0, sizeof(super.disks[d])); | |
111 | super.disks[d].number = d; | |
0df46c2a NB |
112 | super.disks[d].major = major(stb.st_rdev); |
113 | super.disks[d].minor = minor(stb.st_rdev); | |
e5329c37 NB |
114 | super.disks[d].raid_disk = d; |
115 | super.disks[d].state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
116 | ||
117 | super.this_disk = super.disks[d]; | |
118 | super.sb_csum = calc_sb_csum(&super); | |
119 | if (store_super(nfd, &super)) { | |
120 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", newdev); | |
121 | close(nfd); | |
122 | return 1; | |
123 | } | |
124 | disk.number = d; | |
0df46c2a NB |
125 | disk.major = major(stb.st_rdev); |
126 | disk.minor = minor(stb.st_rdev); | |
e5329c37 NB |
127 | disk.raid_disk = d; |
128 | disk.state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
129 | close(nfd); | |
130 | if (ioctl(fd, ADD_NEW_DISK, &disk) != 0) { | |
131 | fprintf(stderr, Name ": Cannot add new disk to this array\n"); | |
132 | return 1; | |
133 | } | |
134 | /* Well, that seems to have worked. | |
135 | * Now go through and update all superblocks | |
136 | */ | |
137 | ||
138 | if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) { | |
139 | fprintf(stderr, Name ": cannot get array info for %s\n", devname); | |
140 | return 1; | |
141 | } | |
142 | ||
143 | nd = d; | |
144 | for (d=0 ; d < array.raid_disks ; d++) { | |
145 | mdu_disk_info_t disk; | |
146 | char *dv; | |
147 | ||
148 | disk.number = d; | |
149 | if (ioctl(fd, GET_DISK_INFO, &disk) < 0) { | |
150 | fprintf(stderr, Name ": cannot get device detail for device %d\n", | |
151 | d); | |
152 | return 1; | |
153 | } | |
154 | dv = map_dev(disk.major, disk.minor); | |
155 | if (!dv) { | |
156 | fprintf(stderr, Name ": cannot find device file for device %d\n", | |
157 | d); | |
158 | return 1; | |
159 | } | |
160 | fd2 = open(dv, O_RDWR); | |
161 | if (fd2 < 0) { | |
162 | fprintf(stderr, Name ": cannot open device file %s\n", dv); | |
163 | return 1; | |
164 | } | |
165 | if (load_super(fd2, &super)) { | |
166 | fprintf(stderr, Name ": cannot find super block on %s\n", dv); | |
167 | close(fd); | |
168 | return 1; | |
169 | } | |
170 | super.raid_disks = nd+1; | |
171 | super.nr_disks = nd+1; | |
172 | super.active_disks = nd+1; | |
173 | super.working_disks = nd+1; | |
174 | memset(&super.disks[nd], 0, sizeof(super.disks[nd])); | |
175 | super.disks[nd].number = nd; | |
0df46c2a NB |
176 | super.disks[nd].major = major(stb.st_rdev); |
177 | super.disks[nd].minor = minor(stb.st_rdev); | |
e5329c37 NB |
178 | super.disks[nd].raid_disk = nd; |
179 | super.disks[nd].state = (1 << MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE); | |
180 | ||
181 | super.this_disk = super.disks[d]; | |
182 | super.sb_csum = calc_sb_csum(&super); | |
183 | if (store_super(fd2, &super)) { | |
184 | fprintf(stderr, Name ": Cannot store new superblock on %s\n", dv); | |
185 | close(fd2); | |
186 | return 1; | |
187 | } | |
188 | close(fd2); | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } |