treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers
[sfrench/cifs-2.6.git] / block / partitions / check.c
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
40 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
41
42 static 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
115 static 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
136 void free_partitions(struct parsed_partitions *state)
137 {
138         vfree(state->parts);
139         kfree(state);
140 }
141
142 struct parsed_partitions *
143 check_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 }