Consistently print program Name and __func__ in debug messages.
[thirdparty/mdadm.git] / super-gpt.c
CommitLineData
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1/*
2 * mdadm - manage Linux "md" devices aka RAID arrays.
3 *
4 * Copyright (C) 2010 Neil Brown <neilb@suse.de>
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: <neil@brown.name>
23 *
24 */
25
26/*
27 * 'gpt' is a pseudo metadata type for devices which have a
28 * GPT partition table.
29 *
30 * Obviously arrays cannot be created or assembled for this type.
31 * It is used to allow a new bare device to have an partition table
32 * added so the member partitions can then be included in other
33 * arrays as relevant.
34 *
35 * The meaning operations are:
36 * examine_super, but not brief_examine_super or export_examine
37 * load_super
38 * store_super
39 */
40
41#include "mdadm.h"
42#include "part.h"
43
44static void free_gpt(struct supertype *st)
45{
46 free(st->sb);
47 st->sb = NULL;
48}
49
50#ifndef MDASSEMBLE
51static void examine_gpt(struct supertype *st, char *homehost)
52{
53 struct GPT *gpt = st->sb + 512;
54 struct GPT_part_entry *gpe = st->sb + 1024;
55 unsigned int i;
56
57 printf(" GPT Magic : %llx\n", (unsigned long long)__le64_to_cpu(gpt->magic));
58 printf(" GPT Revision : %ld\n", (long)__le32_to_cpu(gpt->revision));
59 for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
60 printf(" Partition[%02d] : %12llu sectors at %12llu\n",
61 i,
62 (unsigned long long)__le64_to_cpu(gpe[i].starting_lba),
63 (unsigned long long)__le64_to_cpu(gpe[i].ending_lba)-
64 (unsigned long long)__le64_to_cpu(gpe[i].starting_lba)
65 +1
66 );
67 }
68}
69#endif /* MDASSEMBLE */
70
71static int load_gpt(struct supertype *st, int fd, char *devname)
72{
73 struct MBR *super;
74 struct GPT *gpt_head;
75 int to_read;
76
77 free_gpt(st);
78
a7322ae1 79 if (posix_memalign((void**)&super, 4096, 32*512) != 0) {
1ade5cc1 80 pr_err("could not allocate superblock\n");
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81 return 1;
82 }
83
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84 lseek(fd, 0, 0);
85 if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
86 no_read:
87 if (devname)
e7b84f9d 88 pr_err("Cannot read partition table on %s\n",
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89 devname);
90 free(super);
91 return 1;
92 }
1011e834 93
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94 if (super->magic != MBR_SIGNATURE_MAGIC ||
95 super->parts[0].part_type != MBR_GPT_PARTITION_TYPE) {
96 not_found:
97 if (devname)
e7b84f9d 98 pr_err("No partition table found on %s\n",
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99 devname);
100 free(super);
101 return 1;
102 }
103 /* Seem to have GPT, load the header */
104 gpt_head = (struct GPT*)(super+1);
105 if (read(fd, gpt_head, sizeof(*gpt_head)) != sizeof(*gpt_head))
106 goto no_read;
107 if (gpt_head->magic != GPT_SIGNATURE_MAGIC)
108 goto not_found;
109 if (__le32_to_cpu(gpt_head->part_cnt) >= 128)
110 goto not_found;
111
112 to_read = __le32_to_cpu(gpt_head->part_cnt) * sizeof(struct GPT_part_entry);
113 to_read = ((to_read+511)/512) * 512;
114 if (read(fd, gpt_head+1, to_read) != to_read)
115 goto no_read;
116
117 st->sb = super;
118
119 if (st->ss == NULL) {
120 st->ss = &gpt;
121 st->minor_version = 0;
122 st->max_devs = 1;
123 st->info = NULL;
124 }
125 return 0;
126}
127
128static int store_gpt(struct supertype *st, int fd)
129{
130 /* FIXME should I save the boot loader */
131 /* need to write two copies! */
132 /* FIXME allow for blocks != 512 bytes
133 *etc
134 */
135 struct MBR *super = st->sb;
136 struct GPT *gpt;
137 int to_write;
138
139 gpt = (struct GPT*)(super+1);
140
141 to_write = __le32_to_cpu(gpt->part_cnt) * sizeof(struct GPT_part_entry);
142 to_write = ((to_write+511)/512) * 512;
143
144 lseek(fd, 0, 0);
145 if (write(fd, st->sb, to_write) != to_write)
146 return 4;
147
148 fsync(fd);
149 ioctl(fd, BLKRRPART, 0);
150 return 0;
151}
152
a5d85af7 153static void getinfo_gpt(struct supertype *st, struct mdinfo *info, char *map)
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154{
155 struct GPT *gpt = st->sb + 512;
156 struct GPT_part_entry *gpe = st->sb + 1024;
157 unsigned int i;
158
159 memset(&info->array, 0, sizeof(info->array));
160 memset(&info->disk, 0, sizeof(info->disk));
161 strcpy(info->text_version, "gpt");
162 strcpy(info->name, "gpt");
163 info->component_size = 0;
164
165 for (i = 0; i < __le32_to_cpu(gpt->part_cnt); i++) {
166 unsigned long long last =
167 (unsigned long long)__le64_to_cpu(gpe[i].ending_lba);
168 if (last > info->component_size)
169 info->component_size = last;
170 }
171}
172
173static struct supertype *match_metadata_desc(char *arg)
174{
503975b9 175 struct supertype *st = xmalloc(sizeof(*st));
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176
177 if (!st)
178 return st;
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179 if (strcmp(arg, "gpt") != 0) {
180 free(st);
0592faeb 181 return NULL;
c9aaf5ef 182 }
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183
184 st->ss = &gpt;
185 st->info = NULL;
186 st->minor_version = 0;
187 st->max_devs = 1;
188 st->sb = NULL;
189 return st;
190}
191
192#ifndef MDASSEMBLE
193static int validate_geometry(struct supertype *st, int level,
194 int layout, int raiddisks,
c21e737b 195 int *chunk, unsigned long long size,
af4348dd 196 unsigned long long data_offset,
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197 char *subdev, unsigned long long *freesize,
198 int verbose)
199{
e7b84f9d 200 pr_err("gpt metadata cannot be used this way\n");
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201 return 0;
202}
203#endif
204
205struct superswitch gpt = {
206#ifndef MDASSEMBLE
207 .examine_super = examine_gpt,
0592faeb 208 .validate_geometry = validate_geometry,
71204a50 209#endif
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210 .match_metadata_desc = match_metadata_desc,
211 .load_super = load_gpt,
212 .store_super = store_gpt,
213 .getinfo_super = getinfo_gpt,
214 .free_super = free_gpt,
215 .name = "gpt",
216};