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Linux/block/cmdline-parser.c

  1 /*
  2  * Parse command line, get partition information
  3  *
  4  * Written by Cai Zhiyong <caizhiyong@huawei.com>
  5  *
  6  */
  7 #include <linux/export.h>
  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 }
161 EXPORT_SYMBOL(cmdline_parts_free);
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 EXPORT_SYMBOL(cmdline_parts_parse);
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 }
218 EXPORT_SYMBOL(cmdline_parts_find);
219 
220 /*
221  *  add_part()
222  *    0 success.
223  *    1 can not add so many partitions.
224  */
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)
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         }
251 
252         return slot;
253 }
254 EXPORT_SYMBOL(cmdline_parts_set);
255 

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