tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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(array_size(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}