1 /*
2 * fs/partitions/check.c
3 *
4 * Code extracted from drivers/block/genhd.c
5 * Copyright (C) 1991-1998 Linus Torvalds
6 * Re-organised Feb 1998 Russell King
7 *
8 * We now have independent partition support from the
9 * block drivers, which allows all the partition code to
10 * be grouped in one location, and it to be mostly self
11 * contained.
12 *
13 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
14 */
15
16 #include <linux/slab.h>
17 #include <linux/vmalloc.h>
18 #include <linux/ctype.h>
19 #include <linux/genhd.h>
20
21 #include "check.h"
22
23 #include "acorn.h"
24 #include "amiga.h"
25 #include "atari.h"
26 #include "ldm.h"
27 #include "mac.h"
28 #include "msdos.h"
29 #include "osf.h"
30 #include "sgi.h"
31 #include "sun.h"
32 #include "ibm.h"
33 #include "ultrix.h"
34 #include "efi.h"
35 #include "karma.h"
36 #include "sysv68.h"
37 #include "cmdline.h"
38
39 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
40
41 static int (*check_part[])(struct parsed_partitions *) = {
42 /*
43 * Probe partition formats with tables at disk address 0
44 * that also have an ADFS boot block at 0xdc0.
45 */
46 #ifdef CONFIG_ACORN_PARTITION_ICS
47 adfspart_check_ICS,
48 #endif
49 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
50 adfspart_check_POWERTEC,
51 #endif
52 #ifdef CONFIG_ACORN_PARTITION_EESOX
53 adfspart_check_EESOX,
54 #endif
55
56 /*
57 * Now move on to formats that only have partition info at
58 * disk address 0xdc0. Since these may also have stale
59 * PC/BIOS partition tables, they need to come before
60 * the msdos entry.
61 */
62 #ifdef CONFIG_ACORN_PARTITION_CUMANA
63 adfspart_check_CUMANA,
64 #endif
65 #ifdef CONFIG_ACORN_PARTITION_ADFS
66 adfspart_check_ADFS,
67 #endif
68
69 #ifdef CONFIG_CMDLINE_PARTITION
70 cmdline_partition,
71 #endif
72 #ifdef CONFIG_EFI_PARTITION
73 efi_partition, /* this must come before msdos */
74 #endif
75 #ifdef CONFIG_SGI_PARTITION
76 sgi_partition,
77 #endif
78 #ifdef CONFIG_LDM_PARTITION
79 ldm_partition, /* this must come before msdos */
80 #endif
81 #ifdef CONFIG_MSDOS_PARTITION
82 msdos_partition,
83 #endif
84 #ifdef CONFIG_OSF_PARTITION
85 osf_partition,
86 #endif
87 #ifdef CONFIG_SUN_PARTITION
88 sun_partition,
89 #endif
90 #ifdef CONFIG_AMIGA_PARTITION
91 amiga_partition,
92 #endif
93 #ifdef CONFIG_ATARI_PARTITION
94 atari_partition,
95 #endif
96 #ifdef CONFIG_MAC_PARTITION
97 mac_partition,
98 #endif
99 #ifdef CONFIG_ULTRIX_PARTITION
100 ultrix_partition,
101 #endif
102 #ifdef CONFIG_IBM_PARTITION
103 ibm_partition,
104 #endif
105 #ifdef CONFIG_KARMA_PARTITION
106 karma_partition,
107 #endif
108 #ifdef CONFIG_SYSV68_PARTITION
109 sysv68_partition,
110 #endif
111 NULL
112 };
113
allocate_partitions(struct gendisk * hd)114 static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
115 {
116 struct parsed_partitions *state;
117 int nr;
118
119 state = kzalloc(sizeof(*state), GFP_KERNEL);
120 if (!state)
121 return NULL;
122
123 nr = disk_max_parts(hd);
124 state->parts = vzalloc(nr * sizeof(state->parts[0]));
125 if (!state->parts) {
126 kfree(state);
127 return NULL;
128 }
129
130 state->limit = nr;
131
132 return state;
133 }
134
free_partitions(struct parsed_partitions * state)135 void free_partitions(struct parsed_partitions *state)
136 {
137 vfree(state->parts);
138 kfree(state);
139 }
140
141 struct parsed_partitions *
check_partition(struct gendisk * hd,struct block_device * bdev)142 check_partition(struct gendisk *hd, struct block_device *bdev)
143 {
144 struct parsed_partitions *state;
145 int i, res, err;
146
147 state = allocate_partitions(hd);
148 if (!state)
149 return NULL;
150 state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
151 if (!state->pp_buf) {
152 free_partitions(state);
153 return NULL;
154 }
155 state->pp_buf[0] = '\0';
156
157 state->bdev = bdev;
158 disk_name(hd, 0, state->name);
159 snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
160 if (isdigit(state->name[strlen(state->name)-1]))
161 sprintf(state->name, "p");
162
163 i = res = err = 0;
164 while (!res && check_part[i]) {
165 memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
166 res = check_part[i++](state);
167 if (res < 0) {
168 /* We have hit an I/O error which we don't report now.
169 * But record it, and let the others do their job.
170 */
171 err = res;
172 res = 0;
173 }
174
175 }
176 if (res > 0) {
177 printk(KERN_INFO "%s", state->pp_buf);
178
179 free_page((unsigned long)state->pp_buf);
180 return state;
181 }
182 if (state->access_beyond_eod)
183 err = -ENOSPC;
184 if (err)
185 /* The partition is unrecognized. So report I/O errors if there were any */
186 res = err;
187 if (res) {
188 if (warn_no_part)
189 strlcat(state->pp_buf,
190 " unable to read partition table\n", PAGE_SIZE);
191 printk(KERN_INFO "%s", state->pp_buf);
192 }
193
194 free_page((unsigned long)state->pp_buf);
195 free_partitions(state);
196 return ERR_PTR(res);
197 }
198