Commit | Line | Data |
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bab55417 CZ |
1 | /* |
2 | * Parse command line, get partition information | |
3 | * | |
4 | * Written by Cai Zhiyong <caizhiyong@huawei.com> | |
5 | * | |
6 | */ | |
bca266b3 | 7 | #include <linux/export.h> |
bab55417 CZ |
8 | #include <linux/cmdline-parser.h> |
9 | ||
10 | static int parse_subpart(struct cmdline_subpart **subpart, char *partdef) | |
11 | { | |
12 | int ret = 0; | |
13 | struct cmdline_subpart *new_subpart; | |
14 | ||
15 | *subpart = NULL; | |
16 | ||
17 | new_subpart = kzalloc(sizeof(struct cmdline_subpart), GFP_KERNEL); | |
18 | if (!new_subpart) | |
19 | return -ENOMEM; | |
20 | ||
21 | if (*partdef == '-') { | |
22 | new_subpart->size = (sector_t)(~0ULL); | |
23 | partdef++; | |
24 | } else { | |
25 | new_subpart->size = (sector_t)memparse(partdef, &partdef); | |
26 | if (new_subpart->size < (sector_t)PAGE_SIZE) { | |
27 | pr_warn("cmdline partition size is invalid."); | |
28 | ret = -EINVAL; | |
29 | goto fail; | |
30 | } | |
31 | } | |
32 | ||
33 | if (*partdef == '@') { | |
34 | partdef++; | |
35 | new_subpart->from = (sector_t)memparse(partdef, &partdef); | |
36 | } else { | |
37 | new_subpart->from = (sector_t)(~0ULL); | |
38 | } | |
39 | ||
40 | if (*partdef == '(') { | |
41 | int length; | |
42 | char *next = strchr(++partdef, ')'); | |
43 | ||
44 | if (!next) { | |
45 | pr_warn("cmdline partition format is invalid."); | |
46 | ret = -EINVAL; | |
47 | goto fail; | |
48 | } | |
49 | ||
50 | length = min_t(int, next - partdef, | |
51 | sizeof(new_subpart->name) - 1); | |
52 | strncpy(new_subpart->name, partdef, length); | |
53 | new_subpart->name[length] = '\0'; | |
54 | ||
55 | partdef = ++next; | |
56 | } else | |
57 | new_subpart->name[0] = '\0'; | |
58 | ||
59 | new_subpart->flags = 0; | |
60 | ||
61 | if (!strncmp(partdef, "ro", 2)) { | |
62 | new_subpart->flags |= PF_RDONLY; | |
63 | partdef += 2; | |
64 | } | |
65 | ||
66 | if (!strncmp(partdef, "lk", 2)) { | |
67 | new_subpart->flags |= PF_POWERUP_LOCK; | |
68 | partdef += 2; | |
69 | } | |
70 | ||
71 | *subpart = new_subpart; | |
72 | return 0; | |
73 | fail: | |
74 | kfree(new_subpart); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | static void free_subpart(struct cmdline_parts *parts) | |
79 | { | |
80 | struct cmdline_subpart *subpart; | |
81 | ||
82 | while (parts->subpart) { | |
83 | subpart = parts->subpart; | |
84 | parts->subpart = subpart->next_subpart; | |
85 | kfree(subpart); | |
86 | } | |
87 | } | |
88 | ||
89 | static int parse_parts(struct cmdline_parts **parts, const char *bdevdef) | |
90 | { | |
91 | int ret = -EINVAL; | |
92 | char *next; | |
93 | int length; | |
94 | struct cmdline_subpart **next_subpart; | |
95 | struct cmdline_parts *newparts; | |
96 | char buf[BDEVNAME_SIZE + 32 + 4]; | |
97 | ||
98 | *parts = NULL; | |
99 | ||
100 | newparts = kzalloc(sizeof(struct cmdline_parts), GFP_KERNEL); | |
101 | if (!newparts) | |
102 | return -ENOMEM; | |
103 | ||
104 | next = strchr(bdevdef, ':'); | |
105 | if (!next) { | |
106 | pr_warn("cmdline partition has no block device."); | |
107 | goto fail; | |
108 | } | |
109 | ||
110 | length = min_t(int, next - bdevdef, sizeof(newparts->name) - 1); | |
111 | strncpy(newparts->name, bdevdef, length); | |
112 | newparts->name[length] = '\0'; | |
113 | newparts->nr_subparts = 0; | |
114 | ||
115 | next_subpart = &newparts->subpart; | |
116 | ||
117 | while (next && *(++next)) { | |
118 | bdevdef = next; | |
119 | next = strchr(bdevdef, ','); | |
120 | ||
121 | length = (!next) ? (sizeof(buf) - 1) : | |
122 | min_t(int, next - bdevdef, sizeof(buf) - 1); | |
123 | ||
124 | strncpy(buf, bdevdef, length); | |
125 | buf[length] = '\0'; | |
126 | ||
127 | ret = parse_subpart(next_subpart, buf); | |
128 | if (ret) | |
129 | goto fail; | |
130 | ||
131 | newparts->nr_subparts++; | |
132 | next_subpart = &(*next_subpart)->next_subpart; | |
133 | } | |
134 | ||
135 | if (!newparts->subpart) { | |
136 | pr_warn("cmdline partition has no valid partition."); | |
137 | ret = -EINVAL; | |
138 | goto fail; | |
139 | } | |
140 | ||
141 | *parts = newparts; | |
142 | ||
143 | return 0; | |
144 | fail: | |
145 | free_subpart(newparts); | |
146 | kfree(newparts); | |
147 | return ret; | |
148 | } | |
149 | ||
150 | void cmdline_parts_free(struct cmdline_parts **parts) | |
151 | { | |
152 | struct cmdline_parts *next_parts; | |
153 | ||
154 | while (*parts) { | |
155 | next_parts = (*parts)->next_parts; | |
156 | free_subpart(*parts); | |
157 | kfree(*parts); | |
158 | *parts = next_parts; | |
159 | } | |
160 | } | |
bca266b3 | 161 | EXPORT_SYMBOL(cmdline_parts_free); |
bab55417 CZ |
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 | } | |
bca266b3 | 209 | EXPORT_SYMBOL(cmdline_parts_parse); |
bab55417 CZ |
210 | |
211 | struct cmdline_parts *cmdline_parts_find(struct cmdline_parts *parts, | |
212 | const char *bdev) | |
213 | { | |
214 | while (parts && strncmp(bdev, parts->name, sizeof(parts->name))) | |
215 | parts = parts->next_parts; | |
216 | return parts; | |
217 | } | |
bca266b3 | 218 | EXPORT_SYMBOL(cmdline_parts_find); |
bab55417 CZ |
219 | |
220 | /* | |
221 | * add_part() | |
222 | * 0 success. | |
223 | * 1 can not add so many partitions. | |
224 | */ | |
bca266b3 C |
225 | int cmdline_parts_set(struct cmdline_parts *parts, sector_t disk_size, |
226 | int slot, | |
227 | int (*add_part)(int, struct cmdline_subpart *, void *), | |
228 | void *param) | |
bab55417 CZ |
229 | { |
230 | sector_t from = 0; | |
231 | struct cmdline_subpart *subpart; | |
232 | ||
233 | for (subpart = parts->subpart; subpart; | |
234 | subpart = subpart->next_subpart, slot++) { | |
235 | if (subpart->from == (sector_t)(~0ULL)) | |
236 | subpart->from = from; | |
237 | else | |
238 | from = subpart->from; | |
239 | ||
240 | if (from >= disk_size) | |
241 | break; | |
242 | ||
243 | if (subpart->size > (disk_size - from)) | |
244 | subpart->size = disk_size - from; | |
245 | ||
246 | from += subpart->size; | |
247 | ||
248 | if (add_part(slot, subpart, param)) | |
249 | break; | |
250 | } | |
bca266b3 C |
251 | |
252 | return slot; | |
bab55417 | 253 | } |
bca266b3 | 254 | EXPORT_SYMBOL(cmdline_parts_set); |