bc908672c9764ca782f1e575825c1495e11a6ab4
[linux-2.6.git] / block / partitions / check.c
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/ctype.h>
18 #include <linux/genhd.h>
19
20 #include "check.h"
21
22 #include "acorn.h"
23 #include "amiga.h"
24 #include "atari.h"
25 #include "ldm.h"
26 #include "mac.h"
27 #include "msdos.h"
28 #include "osf.h"
29 #include "sgi.h"
30 #include "sun.h"
31 #include "ibm.h"
32 #include "ultrix.h"
33 #include "efi.h"
34 #include "karma.h"
35 #include "sysv68.h"
36
37 int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
38
39 static int (*check_part[])(struct parsed_partitions *) = {
40         /*
41          * Probe partition formats with tables at disk address 0
42          * that also have an ADFS boot block at 0xdc0.
43          */
44 #ifdef CONFIG_ACORN_PARTITION_ICS
45         adfspart_check_ICS,
46 #endif
47 #ifdef CONFIG_ACORN_PARTITION_POWERTEC
48         adfspart_check_POWERTEC,
49 #endif
50 #ifdef CONFIG_ACORN_PARTITION_EESOX
51         adfspart_check_EESOX,
52 #endif
53
54         /*
55          * Now move on to formats that only have partition info at
56          * disk address 0xdc0.  Since these may also have stale
57          * PC/BIOS partition tables, they need to come before
58          * the msdos entry.
59          */
60 #ifdef CONFIG_ACORN_PARTITION_CUMANA
61         adfspart_check_CUMANA,
62 #endif
63 #ifdef CONFIG_ACORN_PARTITION_ADFS
64         adfspart_check_ADFS,
65 #endif
66
67 #ifdef CONFIG_EFI_PARTITION
68         efi_partition,          /* this must come before msdos */
69 #endif
70 #ifdef CONFIG_SGI_PARTITION
71         sgi_partition,
72 #endif
73 #ifdef CONFIG_LDM_PARTITION
74         ldm_partition,          /* this must come before msdos */
75 #endif
76 #ifdef CONFIG_MSDOS_PARTITION
77         msdos_partition,
78 #endif
79 #ifdef CONFIG_OSF_PARTITION
80         osf_partition,
81 #endif
82 #ifdef CONFIG_SUN_PARTITION
83         sun_partition,
84 #endif
85 #ifdef CONFIG_AMIGA_PARTITION
86         amiga_partition,
87 #endif
88 #ifdef CONFIG_ATARI_PARTITION
89         atari_partition,
90 #endif
91 #ifdef CONFIG_MAC_PARTITION
92         mac_partition,
93 #endif
94 #ifdef CONFIG_ULTRIX_PARTITION
95         ultrix_partition,
96 #endif
97 #ifdef CONFIG_IBM_PARTITION
98         ibm_partition,
99 #endif
100 #ifdef CONFIG_KARMA_PARTITION
101         karma_partition,
102 #endif
103 #ifdef CONFIG_SYSV68_PARTITION
104         sysv68_partition,
105 #endif
106         NULL
107 };
108
109 struct parsed_partitions *
110 check_partition(struct gendisk *hd, struct block_device *bdev)
111 {
112         struct parsed_partitions *state;
113         int i, res, err;
114
115         state = kzalloc(sizeof(struct parsed_partitions), GFP_KERNEL);
116         if (!state)
117                 return NULL;
118         state->pp_buf = (char *)__get_free_page(GFP_KERNEL);
119         if (!state->pp_buf) {
120                 kfree(state);
121                 return NULL;
122         }
123         state->pp_buf[0] = '\0';
124
125         state->bdev = bdev;
126         disk_name(hd, 0, state->name);
127         snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
128         if (isdigit(state->name[strlen(state->name)-1]))
129                 sprintf(state->name, "p");
130
131         state->limit = disk_max_parts(hd);
132         i = res = err = 0;
133         while (!res && check_part[i]) {
134                 memset(&state->parts, 0, sizeof(state->parts));
135                 res = check_part[i++](state);
136                 if (res < 0) {
137                         /* We have hit an I/O error which we don't report now.
138                         * But record it, and let the others do their job.
139                         */
140                         err = res;
141                         res = 0;
142                 }
143
144         }
145         if (res > 0) {
146                 printk(KERN_INFO "%s", state->pp_buf);
147
148                 free_page((unsigned long)state->pp_buf);
149                 return state;
150         }
151         if (state->access_beyond_eod)
152                 err = -ENOSPC;
153         if (err)
154         /* The partition is unrecognized. So report I/O errors if there were any */
155                 res = err;
156         if (!res)
157                 strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE);
158         else if (warn_no_part)
159                 strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE);
160
161         printk(KERN_INFO "%s", state->pp_buf);
162
163         free_page((unsigned long)state->pp_buf);
164         kfree(state);
165         return ERR_PTR(res);
166 }