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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/partitions/check.c
4 *
5 * Code extracted from drivers/block/genhd.c
6 * Copyright (C) 1991-1998 Linus Torvalds
7 * Re-organised Feb 1998 Russell King
8 *
9 * We now have independent partition support from the
10 * block drivers, which allows all the partition code to
11 * be grouped in one location, and it to be mostly self
12 * contained.
13 *
14 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
15 */
16
17#include <linux/slab.h>
18#include <linux/vmalloc.h>
19#include <linux/ctype.h>
20#include <linux/genhd.h>
21
22#include "check.h"
23
24#include "acorn.h"
25#include "amiga.h"
26#include "atari.h"
27#include "ldm.h"
28#include "mac.h"
29#include "msdos.h"
30#include "osf.h"
31#include "sgi.h"
32#include "sun.h"
33#include "ibm.h"
34#include "ultrix.h"
35#include "efi.h"
36#include "karma.h"
37#include "sysv68.h"
38#include "cmdline.h"
39
40int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
41
42static int (*check_part[])(struct parsed_partitions *) = {
43 /*
44 * Probe partition formats with tables at disk address 0
45 * that also have an ADFS boot block at 0xdc0.
46 */
47#ifdef CONFIG_ACORN_PARTITION_ICS
48 adfspart_check_ICS,
49#endif
50#ifdef CONFIG_ACORN_PARTITION_POWERTEC
51 adfspart_check_POWERTEC,
52#endif
53#ifdef CONFIG_ACORN_PARTITION_EESOX
54 adfspart_check_EESOX,
55#endif
56
57 /*
58 * Now move on to formats that only have partition info at
59 * disk address 0xdc0. Since these may also have stale
60 * PC/BIOS partition tables, they need to come before
61 * the msdos entry.
62 */
63#ifdef CONFIG_ACORN_PARTITION_CUMANA
64 adfspart_check_CUMANA,
65#endif
66#ifdef CONFIG_ACORN_PARTITION_ADFS
67 adfspart_check_ADFS,
68#endif
69
70#ifdef CONFIG_CMDLINE_PARTITION
71 cmdline_partition,
72#endif
73#ifdef CONFIG_EFI_PARTITION
74 efi_partition, /* this must come before msdos */
75#endif
76#ifdef CONFIG_SGI_PARTITION
77 sgi_partition,
78#endif
79#ifdef CONFIG_LDM_PARTITION
80 ldm_partition, /* this must come before msdos */
81#endif
82#ifdef CONFIG_MSDOS_PARTITION
83 msdos_partition,
84#endif
85#ifdef CONFIG_OSF_PARTITION
86 osf_partition,
87#endif
88#ifdef CONFIG_SUN_PARTITION
89 sun_partition,
90#endif
91#ifdef CONFIG_AMIGA_PARTITION
92 amiga_partition,
93#endif
94#ifdef CONFIG_ATARI_PARTITION
95 atari_partition,
96#endif
97#ifdef CONFIG_MAC_PARTITION
98 mac_partition,
99#endif
100#ifdef CONFIG_ULTRIX_PARTITION
101 ultrix_partition,
102#endif
103#ifdef CONFIG_IBM_PARTITION
104 ibm_partition,
105#endif
106#ifdef CONFIG_KARMA_PARTITION
107 karma_partition,
108#endif
109#ifdef CONFIG_SYSV68_PARTITION
110 sysv68_partition,
111#endif
112 NULL
113};
114
115static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
116{
117 struct parsed_partitions *state;
118 int nr;
119
120 state = kzalloc(sizeof(*state), GFP_KERNEL);
121 if (!state)
122 return NULL;
123
124 nr = disk_max_parts(hd);
125 state->parts = vzalloc(nr * sizeof(state->parts[0]));
126 if (!state->parts) {
127 kfree(state);
128 return NULL;
129 }
130
131 state->limit = nr;
132
133 return state;
134}
135
136void free_partitions(struct parsed_partitions *state)
137{
138 vfree(state->parts);
139 kfree(state);
140}
141
142struct parsed_partitions *
143check_partition(struct gendisk *hd, struct block_device *bdev)
144{
145 struct parsed_partitions *state;
146 int i, res, err;
147
148 state = allocate_partitions(hd);
149 if (!state)
150 return NULL;
151 state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
152 if (!state->pp_buf) {
153 free_partitions(state);
154 return NULL;
155 }
156 state->pp_buf[0] = '\0';
157
158 state->bdev = bdev;
159 disk_name(hd, 0, state->name);
160 snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
161 if (isdigit(state->name[strlen(state->name)-1]))
162 sprintf(state->name, "p");
163
164 i = res = err = 0;
165 while (!res && check_part[i]) {
166 memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
167 res = check_part[i++](state);
168 if (res < 0) {
169 /* We have hit an I/O error which we don't report now.
170 * But record it, and let the others do their job.
171 */
172 err = res;
173 res = 0;
174 }
175
176 }
177 if (res > 0) {
178 printk(KERN_INFO "%s", state->pp_buf);
179
180 free_page((unsigned long)state->pp_buf);
181 return state;
182 }
183 if (state->access_beyond_eod)
184 err = -ENOSPC;
185 if (err)
186 /* The partition is unrecognized. So report I/O errors if there were any */
187 res = err;
188 if (res) {
189 if (warn_no_part)
190 strlcat(state->pp_buf,
191 " unable to read partition table\n", PAGE_SIZE);
192 printk(KERN_INFO "%s", state->pp_buf);
193 }
194
195 free_page((unsigned long)state->pp_buf);
196 free_partitions(state);
197 return ERR_PTR(res);
198}
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
39int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
40
41static 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
114static 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
135void free_partitions(struct parsed_partitions *state)
136{
137 vfree(state->parts);
138 kfree(state);
139}
140
141struct parsed_partitions *
142check_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}