Root/
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 | |
38 | int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ |
39 | |
40 | static int (*check_part[])(struct parsed_partitions *) = { |
41 | /* |
42 | * Probe partition formats with tables at disk address 0 |
43 | * that also have an ADFS boot block at 0xdc0. |
44 | */ |
45 | #ifdef CONFIG_ACORN_PARTITION_ICS |
46 | adfspart_check_ICS, |
47 | #endif |
48 | #ifdef CONFIG_ACORN_PARTITION_POWERTEC |
49 | adfspart_check_POWERTEC, |
50 | #endif |
51 | #ifdef CONFIG_ACORN_PARTITION_EESOX |
52 | adfspart_check_EESOX, |
53 | #endif |
54 | |
55 | /* |
56 | * Now move on to formats that only have partition info at |
57 | * disk address 0xdc0. Since these may also have stale |
58 | * PC/BIOS partition tables, they need to come before |
59 | * the msdos entry. |
60 | */ |
61 | #ifdef CONFIG_ACORN_PARTITION_CUMANA |
62 | adfspart_check_CUMANA, |
63 | #endif |
64 | #ifdef CONFIG_ACORN_PARTITION_ADFS |
65 | adfspart_check_ADFS, |
66 | #endif |
67 | |
68 | #ifdef CONFIG_EFI_PARTITION |
69 | efi_partition, /* this must come before msdos */ |
70 | #endif |
71 | #ifdef CONFIG_SGI_PARTITION |
72 | sgi_partition, |
73 | #endif |
74 | #ifdef CONFIG_LDM_PARTITION |
75 | ldm_partition, /* this must come before msdos */ |
76 | #endif |
77 | #ifdef CONFIG_MSDOS_PARTITION |
78 | msdos_partition, |
79 | #endif |
80 | #ifdef CONFIG_OSF_PARTITION |
81 | osf_partition, |
82 | #endif |
83 | #ifdef CONFIG_SUN_PARTITION |
84 | sun_partition, |
85 | #endif |
86 | #ifdef CONFIG_AMIGA_PARTITION |
87 | amiga_partition, |
88 | #endif |
89 | #ifdef CONFIG_ATARI_PARTITION |
90 | atari_partition, |
91 | #endif |
92 | #ifdef CONFIG_MAC_PARTITION |
93 | mac_partition, |
94 | #endif |
95 | #ifdef CONFIG_ULTRIX_PARTITION |
96 | ultrix_partition, |
97 | #endif |
98 | #ifdef CONFIG_IBM_PARTITION |
99 | ibm_partition, |
100 | #endif |
101 | #ifdef CONFIG_KARMA_PARTITION |
102 | karma_partition, |
103 | #endif |
104 | #ifdef CONFIG_SYSV68_PARTITION |
105 | sysv68_partition, |
106 | #endif |
107 | NULL |
108 | }; |
109 | |
110 | static struct parsed_partitions *allocate_partitions(struct gendisk *hd) |
111 | { |
112 | struct parsed_partitions *state; |
113 | int nr; |
114 | |
115 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
116 | if (!state) |
117 | return NULL; |
118 | |
119 | nr = disk_max_parts(hd); |
120 | state->parts = vzalloc(nr * sizeof(state->parts[0])); |
121 | if (!state->parts) { |
122 | kfree(state); |
123 | return NULL; |
124 | } |
125 | |
126 | state->limit = nr; |
127 | |
128 | return state; |
129 | } |
130 | |
131 | void free_partitions(struct parsed_partitions *state) |
132 | { |
133 | vfree(state->parts); |
134 | kfree(state); |
135 | } |
136 | |
137 | struct parsed_partitions * |
138 | check_partition(struct gendisk *hd, struct block_device *bdev) |
139 | { |
140 | struct parsed_partitions *state; |
141 | int i, res, err; |
142 | |
143 | state = allocate_partitions(hd); |
144 | if (!state) |
145 | return NULL; |
146 | state->pp_buf = (char *)__get_free_page(GFP_KERNEL); |
147 | if (!state->pp_buf) { |
148 | free_partitions(state); |
149 | return NULL; |
150 | } |
151 | state->pp_buf[0] = '\0'; |
152 | |
153 | state->bdev = bdev; |
154 | disk_name(hd, 0, state->name); |
155 | snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name); |
156 | if (isdigit(state->name[strlen(state->name)-1])) |
157 | sprintf(state->name, "p"); |
158 | |
159 | i = res = err = 0; |
160 | while (!res && check_part[i]) { |
161 | memset(state->parts, 0, state->limit * sizeof(state->parts[0])); |
162 | res = check_part[i++](state); |
163 | if (res < 0) { |
164 | /* We have hit an I/O error which we don't report now. |
165 | * But record it, and let the others do their job. |
166 | */ |
167 | err = res; |
168 | res = 0; |
169 | } |
170 | |
171 | } |
172 | if (res > 0) { |
173 | printk(KERN_INFO "%s", state->pp_buf); |
174 | |
175 | free_page((unsigned long)state->pp_buf); |
176 | return state; |
177 | } |
178 | if (state->access_beyond_eod) |
179 | err = -ENOSPC; |
180 | if (err) |
181 | /* The partition is unrecognized. So report I/O errors if there were any */ |
182 | res = err; |
183 | if (!res) |
184 | strlcat(state->pp_buf, " unknown partition table\n", PAGE_SIZE); |
185 | else if (warn_no_part) |
186 | strlcat(state->pp_buf, " unable to read partition table\n", PAGE_SIZE); |
187 | |
188 | printk(KERN_INFO "%s", state->pp_buf); |
189 | |
190 | free_page((unsigned long)state->pp_buf); |
191 | free_partitions(state); |
192 | return ERR_PTR(res); |
193 | } |
194 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9