Commit | Line | Data |
---|---|---|
bab55417 CZ |
1 | /* |
2 | * Parse command line, get partition information | |
3 | * | |
4 | * Written by Cai Zhiyong <caizhiyong@huawei.com> | |
5 | * | |
6 | */ | |
7 | #include <linux/buffer_head.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/cmdline-parser.h> | |
10 | ||
11 | static int parse_subpart(struct cmdline_subpart **subpart, char *partdef) | |
12 | { | |
13 | int ret = 0; | |
14 | struct cmdline_subpart *new_subpart; | |
15 | ||
16 | *subpart = NULL; | |
17 | ||
18 | new_subpart = kzalloc(sizeof(struct cmdline_subpart), GFP_KERNEL); | |
19 | if (!new_subpart) | |
20 | return -ENOMEM; | |
21 | ||
22 | if (*partdef == '-') { | |
23 | new_subpart->size = (sector_t)(~0ULL); | |
24 | partdef++; | |
25 | } else { | |
26 | new_subpart->size = (sector_t)memparse(partdef, &partdef); | |
27 | if (new_subpart->size < (sector_t)PAGE_SIZE) { | |
28 | pr_warn("cmdline partition size is invalid."); | |
29 | ret = -EINVAL; | |
30 | goto fail; | |
31 | } | |
32 | } | |
33 | ||
34 | if (*partdef == '@') { | |
35 | partdef++; | |
36 | new_subpart->from = (sector_t)memparse(partdef, &partdef); | |
37 | } else { | |
38 | new_subpart->from = (sector_t)(~0ULL); | |
39 | } | |
40 | ||
41 | if (*partdef == '(') { | |
42 | int length; | |
43 | char *next = strchr(++partdef, ')'); | |
44 | ||
45 | if (!next) { | |
46 | pr_warn("cmdline partition format is invalid."); | |
47 | ret = -EINVAL; | |
48 | goto fail; | |
49 | } | |
50 | ||
51 | length = min_t(int, next - partdef, | |
52 | sizeof(new_subpart->name) - 1); | |
53 | strncpy(new_subpart->name, partdef, length); | |
54 | new_subpart->name[length] = '\0'; | |
55 | ||
56 | partdef = ++next; | |
57 | } else | |
58 | new_subpart->name[0] = '\0'; | |
59 | ||
60 | new_subpart->flags = 0; | |
61 | ||
62 | if (!strncmp(partdef, "ro", 2)) { | |
63 | new_subpart->flags |= PF_RDONLY; | |
64 | partdef += 2; | |
65 | } | |
66 | ||
67 | if (!strncmp(partdef, "lk", 2)) { | |
68 | new_subpart->flags |= PF_POWERUP_LOCK; | |
69 | partdef += 2; | |
70 | } | |
71 | ||
72 | *subpart = new_subpart; | |
73 | return 0; | |
74 | fail: | |
75 | kfree(new_subpart); | |
76 | return ret; | |
77 | } | |
78 | ||
79 | static void free_subpart(struct cmdline_parts *parts) | |
80 | { | |
81 | struct cmdline_subpart *subpart; | |
82 | ||
83 | while (parts->subpart) { | |
84 | subpart = parts->subpart; | |
85 | parts->subpart = subpart->next_subpart; | |
86 | kfree(subpart); | |
87 | } | |
88 | } | |
89 | ||
90 | static int parse_parts(struct cmdline_parts **parts, const char *bdevdef) | |
91 | { | |
92 | int ret = -EINVAL; | |
93 | char *next; | |
94 | int length; | |
95 | struct cmdline_subpart **next_subpart; | |
96 | struct cmdline_parts *newparts; | |
97 | char buf[BDEVNAME_SIZE + 32 + 4]; | |
98 | ||
99 | *parts = NULL; | |
100 | ||
101 | newparts = kzalloc(sizeof(struct cmdline_parts), GFP_KERNEL); | |
102 | if (!newparts) | |
103 | return -ENOMEM; | |
104 | ||
105 | next = strchr(bdevdef, ':'); | |
106 | if (!next) { | |
107 | pr_warn("cmdline partition has no block device."); | |
108 | goto fail; | |
109 | } | |
110 | ||
111 | length = min_t(int, next - bdevdef, sizeof(newparts->name) - 1); | |
112 | strncpy(newparts->name, bdevdef, length); | |
113 | newparts->name[length] = '\0'; | |
114 | newparts->nr_subparts = 0; | |
115 | ||
116 | next_subpart = &newparts->subpart; | |
117 | ||
118 | while (next && *(++next)) { | |
119 | bdevdef = next; | |
120 | next = strchr(bdevdef, ','); | |
121 | ||
122 | length = (!next) ? (sizeof(buf) - 1) : | |
123 | min_t(int, next - bdevdef, sizeof(buf) - 1); | |
124 | ||
125 | strncpy(buf, bdevdef, length); | |
126 | buf[length] = '\0'; | |
127 | ||
128 | ret = parse_subpart(next_subpart, buf); | |
129 | if (ret) | |
130 | goto fail; | |
131 | ||
132 | newparts->nr_subparts++; | |
133 | next_subpart = &(*next_subpart)->next_subpart; | |
134 | } | |
135 | ||
136 | if (!newparts->subpart) { | |
137 | pr_warn("cmdline partition has no valid partition."); | |
138 | ret = -EINVAL; | |
139 | goto fail; | |
140 | } | |
141 | ||
142 | *parts = newparts; | |
143 | ||
144 | return 0; | |
145 | fail: | |
146 | free_subpart(newparts); | |
147 | kfree(newparts); | |
148 | return ret; | |
149 | } | |
150 | ||
151 | void cmdline_parts_free(struct cmdline_parts **parts) | |
152 | { | |
153 | struct cmdline_parts *next_parts; | |
154 | ||
155 | while (*parts) { | |
156 | next_parts = (*parts)->next_parts; | |
157 | free_subpart(*parts); | |
158 | kfree(*parts); | |
159 | *parts = next_parts; | |
160 | } | |
161 | } | |
162 | ||
163 | int cmdline_parts_parse(struct cmdline_parts **parts, const char *cmdline) | |
164 | { | |
165 | int ret; | |
166 | char *buf; | |
167 | char *pbuf; | |
168 | char *next; | |
169 | struct cmdline_parts **next_parts; | |
170 | ||
171 | *parts = NULL; | |
172 | ||
173 | next = pbuf = buf = kstrdup(cmdline, GFP_KERNEL); | |
174 | if (!buf) | |
175 | return -ENOMEM; | |
176 | ||
177 | next_parts = parts; | |
178 | ||
179 | while (next && *pbuf) { | |
180 | next = strchr(pbuf, ';'); | |
181 | if (next) | |
182 | *next = '\0'; | |
183 | ||
184 | ret = parse_parts(next_parts, pbuf); | |
185 | if (ret) | |
186 | goto fail; | |
187 | ||
188 | if (next) | |
189 | pbuf = ++next; | |
190 | ||
191 | next_parts = &(*next_parts)->next_parts; | |
192 | } | |
193 | ||
194 | if (!*parts) { | |
195 | pr_warn("cmdline partition has no valid partition."); | |
196 | ret = -EINVAL; | |
197 | goto fail; | |
198 | } | |
199 | ||
200 | ret = 0; | |
201 | done: | |
202 | kfree(buf); | |
203 | return ret; | |
204 | ||
205 | fail: | |
206 | cmdline_parts_free(parts); | |
207 | goto done; | |
208 | } | |
209 | ||
210 | struct cmdline_parts *cmdline_parts_find(struct cmdline_parts *parts, | |
211 | const char *bdev) | |
212 | { | |
213 | while (parts && strncmp(bdev, parts->name, sizeof(parts->name))) | |
214 | parts = parts->next_parts; | |
215 | return parts; | |
216 | } | |
217 | ||
218 | /* | |
219 | * add_part() | |
220 | * 0 success. | |
221 | * 1 can not add so many partitions. | |
222 | */ | |
223 | void cmdline_parts_set(struct cmdline_parts *parts, sector_t disk_size, | |
224 | int slot, | |
225 | int (*add_part)(int, struct cmdline_subpart *, void *), | |
226 | void *param) | |
227 | ||
228 | { | |
229 | sector_t from = 0; | |
230 | struct cmdline_subpart *subpart; | |
231 | ||
232 | for (subpart = parts->subpart; subpart; | |
233 | subpart = subpart->next_subpart, slot++) { | |
234 | if (subpart->from == (sector_t)(~0ULL)) | |
235 | subpart->from = from; | |
236 | else | |
237 | from = subpart->from; | |
238 | ||
239 | if (from >= disk_size) | |
240 | break; | |
241 | ||
242 | if (subpart->size > (disk_size - from)) | |
243 | subpart->size = disk_size - from; | |
244 | ||
245 | from += subpart->size; | |
246 | ||
247 | if (add_part(slot, subpart, param)) | |
248 | break; | |
249 | } | |
250 | } |