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64c4757e NB |
1 | /* |
2 | * mdctl - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001 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 | ||
30 | #include "mdctl.h" | |
31 | ||
82b27616 NB |
32 | #define REGISTER_DEV _IO (MD_MAJOR, 1) |
33 | #define START_MD _IO (MD_MAJOR, 2) | |
34 | #define STOP_MD _IO (MD_MAJOR, 3) | |
35 | ||
64c4757e NB |
36 | int Build(char *mddev, int mdfd, int chunk, int level, |
37 | int raiddisks, | |
38 | int subdevs, char *subdev[]) | |
39 | { | |
82b27616 NB |
40 | /* Build a linear or raid0 arrays without superblocks |
41 | * We cannot really do any checks, we just do it. | |
42 | * For md_version < 0.90.0, we call REGISTER_DEV | |
43 | * with the device numbers, and then | |
44 | * START_MD giving the "geometry" | |
45 | * geometry is 0xpp00cc | |
46 | * where pp is personality: 1==linear, 2=raid0 | |
47 | * cc = chunk size factor: 0==4k, 1==8k etc. | |
48 | * | |
49 | * For md_version >= 0.90.0 we call | |
50 | * SET_ARRAY_INFO, ADD_NEW_DISK, RUN_ARRAY | |
51 | * | |
52 | */ | |
53 | int i; | |
54 | int vers; | |
55 | struct stat stb; | |
56 | if (raiddisks != subdevs) { | |
57 | fprintf(stderr, Name ": requested %d devices in array but listed %d\n", | |
58 | raiddisks, subdevs); | |
59 | return 1; | |
60 | } | |
61 | ||
62 | /* scan all devices, make sure they really are block devices */ | |
63 | for (i=0; i<subdevs; i++) { | |
64 | if (stat(subdev[i], &stb)) { | |
65 | fprintf(stderr, Name ": Cannot find %s: %s\n", | |
66 | subdev[i], strerror(errno)); | |
67 | return 1; | |
68 | } | |
69 | if ((stb.st_mode & S_IFMT) != S_IFBLK) { | |
70 | fprintf(stderr, Name ": %s is not a block device.\n", | |
71 | subdev[i]); | |
72 | return 1; | |
73 | } | |
74 | } | |
75 | ||
76 | vers = md_get_version(mdfd); | |
77 | ||
78 | /* looks Ok, go for it */ | |
79 | if (vers >= 90000) { | |
80 | mdu_array_info_t array; | |
81 | array.level = level; | |
82 | array.size = 0; | |
83 | array.nr_disks = raiddisks; | |
84 | array.raid_disks = raiddisks; | |
85 | array.md_minor = 0; | |
86 | if (fstat(mdfd, &stb)==0) | |
87 | array.md_minor = MINOR(stb.st_rdev); | |
88 | array.not_persistent = 0; | |
89 | array.state = 0; /* not clean, but no errors */ | |
90 | array.active_disks = raiddisks; | |
91 | array.working_disks = raiddisks; | |
92 | array.spare_disks = 0; | |
93 | array.failed_disks = 0; | |
94 | array.chunk_size = chunk*1024; | |
95 | if (ioctl(mdfd, SET_ARRAY_INFO, &array)) { | |
96 | fprintf(stderr, Name ": SET_ARRAY_INFO failed for %s: %s\n", | |
97 | mddev, strerror(errno)); | |
98 | return 1; | |
99 | } | |
100 | } | |
101 | /* now add the devices */ | |
102 | for (i=0; i<subdevs; i++) { | |
103 | if (stat(subdev[i], &stb)) { | |
104 | fprintf(stderr, Name ": Wierd: %s has disappeared.\n", | |
105 | subdev[i]); | |
106 | goto abort; | |
107 | } | |
108 | if ((stb.st_rdev & S_IFMT)!= S_IFBLK) { | |
109 | fprintf(stderr, Name ": Wierd: %s is no longer a block device.\n", | |
110 | subdev[i]); | |
111 | goto abort; | |
112 | } | |
113 | if (vers> 90000) { | |
114 | mdu_disk_info_t disk; | |
115 | disk.number = i; | |
116 | disk.raid_disk = i; | |
117 | disk.state = 6; | |
118 | disk.major = MAJOR(stb.st_rdev); | |
119 | disk.minor = MINOR(stb.st_rdev); | |
120 | if (ioctl(mdfd, ADD_NEW_DISK, &disk)) { | |
121 | fprintf(stderr, Name ": ADD_NEW_DISK failed for %s: %s\n", | |
122 | subdev[i], strerror(errno)); | |
123 | goto abort; | |
124 | } | |
125 | } else { | |
126 | if (ioctl(mdfd, REGISTER_DEV, &stb.st_rdev)) { | |
127 | fprintf(stderr, Name ": REGISTER_DEV failed for %s.\n", | |
128 | subdev[i], strerror(errno)); | |
129 | goto abort; | |
130 | } | |
131 | } | |
132 | } | |
133 | /* now to start it */ | |
134 | if (vers > 90000) { | |
135 | mdu_param_t param; /* not used by syscall */ | |
136 | if (ioctl(mdfd, RUN_ARRAY, param)) { | |
137 | fprintf(stderr, Name ": RUN_ARRAY failed: %s\n", | |
138 | strerror(errno)); | |
139 | goto abort; | |
140 | } | |
141 | } else { | |
142 | int arg; | |
143 | arg=0; | |
144 | while (chunk > 4096) { | |
145 | arg++; | |
146 | chunk >>= 1; | |
147 | } | |
148 | if (level == 0) | |
149 | chunk |= 0x20000; | |
150 | else chunk |= 0x10000; | |
151 | if (ioctl(mdfd, START_MD, arg)) { | |
152 | fprintf(stderr, Name ": START_MD failed: %s\n", | |
153 | strerror(errno)); | |
154 | goto abort; | |
155 | } | |
156 | } | |
157 | fprintf(stderr, Name ": array %s built and started.\n", | |
158 | mddev); | |
159 | return 0; | |
160 | ||
161 | abort: | |
162 | if (vers > 900000) | |
163 | ioctl(mdfd, STOP_ARRAY, 0); | |
164 | else | |
165 | ioctl(mdfd, STOP_MD, 0); | |
166 | return 1; | |
167 | ||
64c4757e | 168 | } |
82b27616 | 169 |