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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Ming Leiac2e5322013-02-27 17:05:19 -080017#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/ctype.h>
Jerome Marchand6f2576a2008-02-08 11:04:35 +010019#include <linux/genhd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21#include "check.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
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"
Bob Copeland0e6e1db2006-01-16 22:14:20 -080035#include "karma.h"
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -070036#include "sysv68.h"
Cai Zhiyongbab55412013-09-11 14:20:09 -070037#include "cmdline.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Linus Torvalds1da177e2005-04-16 15:20:36 -070039int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
40
Tejun Heo1493bf22010-05-15 20:09:30 +020041static int (*check_part[])(struct parsed_partitions *) = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 /*
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
Cai Zhiyongbab55412013-09-11 14:20:09 -070069#ifdef CONFIG_CMDLINE_PARTITION
70 cmdline_partition,
71#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#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
Bob Copeland0e6e1db2006-01-16 22:14:20 -0800105#ifdef CONFIG_KARMA_PARTITION
106 karma_partition,
107#endif
Philippe De Muyter19d0e8c2007-05-08 00:29:15 -0700108#ifdef CONFIG_SYSV68_PARTITION
109 sysv68_partition,
110#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 NULL
112};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Ming Leiac2e5322013-02-27 17:05:19 -0800114static 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
Al Viro94ea4152011-09-16 00:45:36 -0400141struct parsed_partitions *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142check_partition(struct gendisk *hd, struct block_device *bdev)
143{
144 struct parsed_partitions *state;
Suzuki K P57881dd2006-12-06 20:35:16 -0800145 int i, res, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Ming Leiac2e5322013-02-27 17:05:19 -0800147 state = allocate_partitions(hd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 if (!state)
149 return NULL;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700150 state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
151 if (!state->pp_buf) {
Ming Leiac2e5322013-02-27 17:05:19 -0800152 free_partitions(state);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700153 return NULL;
154 }
155 state->pp_buf[0] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Tejun Heo1493bf22010-05-15 20:09:30 +0200157 state->bdev = bdev;
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700158 disk_name(hd, 0, state->name);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700159 snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700160 if (isdigit(state->name[strlen(state->name)-1]))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 sprintf(state->name, "p");
Greg Kroah-Hartmana2964182005-06-20 21:15:16 -0700162
Suzuki K P57881dd2006-12-06 20:35:16 -0800163 i = res = err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 while (!res && check_part[i]) {
Ming Leiac2e5322013-02-27 17:05:19 -0800165 memset(state->parts, 0, state->limit * sizeof(state->parts[0]));
Tejun Heo1493bf22010-05-15 20:09:30 +0200166 res = check_part[i++](state);
Suzuki K P57881dd2006-12-06 20:35:16 -0800167 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700176 if (res > 0) {
177 printk(KERN_INFO "%s", state->pp_buf);
178
179 free_page((unsigned long)state->pp_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 return state;
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700181 }
Tejun Heob403a982010-05-15 20:09:31 +0200182 if (state->access_beyond_eod)
183 err = -ENOSPC;
suzuki9bebff62007-03-07 20:41:24 -0800184 if (err)
Suzuki K P57881dd2006-12-06 20:35:16 -0800185 /* The partition is unrecognized. So report I/O errors if there were any */
186 res = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 if (!res)
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700188 strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 else if (warn_no_part)
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700190 strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
191
192 printk(KERN_INFO "%s", state->pp_buf);
193
194 free_page((unsigned long)state->pp_buf);
Ming Leiac2e5322013-02-27 17:05:19 -0800195 free_partitions(state);
Suzuki Kp5127d002006-12-06 20:35:14 -0800196 return ERR_PTR(res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}