2 * dev.c - allocation/initialization/free routines for dev
4 * Copyright (C) 2001 Andreas Dilger
5 * Copyright (C) 2003 Theodore Ts'o
8 * This file may be redistributed under the terms of the
9 * GNU Lesser General Public License.
20 blkid_dev blkid_new_dev(void)
24 if (!(dev = (blkid_dev) calloc(1, sizeof(struct blkid_struct_dev))))
27 INIT_LIST_HEAD(&dev->bid_devs);
28 INIT_LIST_HEAD(&dev->bid_tags);
33 void blkid_free_dev(blkid_dev dev)
39 printf(" freeing dev %s (%s)\n", dev->bid_name, dev->bid_type ?
40 dev->bid_type : "(null)"));
41 DBG(DEBUG_DEV, blkid_debug_dump_dev(dev));
43 list_del(&dev->bid_devs);
44 while (!list_empty(&dev->bid_tags)) {
45 blkid_tag tag = list_entry(dev->bid_tags.next,
46 struct blkid_struct_tag,
55 * Given a blkid device, return its name
57 extern const char *blkid_dev_devname(blkid_dev dev)
62 #ifdef CONFIG_BLKID_DEBUG
63 void blkid_debug_dump_dev(blkid_dev dev)
68 printf(" dev: NULL\n");
72 printf(" dev: name = %s\n", dev->bid_name);
73 printf(" dev: DEVNO=\"0x%0llx\"\n", (long long)dev->bid_devno);
74 printf(" dev: TIME=\"%ld\"\n", (long)dev->bid_time);
75 printf(" dev: PRI=\"%d\"\n", dev->bid_pri);
76 printf(" dev: flags = 0x%08X\n", dev->bid_flags);
78 list_for_each(p, &dev->bid_tags) {
79 blkid_tag tag = list_entry(p, struct blkid_struct_tag, bit_tags);
81 printf(" tag: %s=\"%s\"\n", tag->bit_name,
84 printf(" tag: NULL\n");
91 * dev iteration routines for the public libblkid interface.
93 * These routines do not expose the list.h implementation, which are a
94 * contamination of the namespace, and which force us to reveal far, far
95 * too much of our internal implementation. I'm not convinced I want
96 * to keep list.h in the long term, anyway. It's fine for kernel
97 * programming, but performance is not the #1 priority for this
98 * library, and I really don't like the tradeoff of type-safety for
99 * performance for this application. [tytso:20030125.2007EST]
103 * This series of functions iterate over all devices in a blkid cache
105 #define DEV_ITERATE_MAGIC 0x01a5284c
107 struct blkid_struct_dev_iterate {
115 extern blkid_dev_iterate blkid_dev_iterate_begin(blkid_cache cache)
117 blkid_dev_iterate iter;
119 iter = malloc(sizeof(struct blkid_struct_dev_iterate));
121 iter->magic = DEV_ITERATE_MAGIC;
123 iter->p = cache->bic_devs.next;
124 iter->search_type = 0;
125 iter->search_value = 0;
130 extern int blkid_dev_set_search(blkid_dev_iterate iter,
131 char *search_type, char *search_value)
133 char *new_type, *new_value;
135 if (!iter || iter->magic != DEV_ITERATE_MAGIC || !search_type ||
138 new_type = malloc(strlen(search_type)+1);
139 new_value = malloc(strlen(search_value)+1);
140 if (!new_type || !new_value) {
145 strcpy(new_type, search_type);
146 strcpy(new_value, search_value);
147 free(iter->search_type);
148 free(iter->search_value);
149 iter->search_type = new_type;
150 iter->search_value = new_value;
155 * Return 0 on success, -1 on error
157 extern int blkid_dev_next(blkid_dev_iterate iter,
163 if (!iter || iter->magic != DEV_ITERATE_MAGIC)
165 while (iter->p != &iter->cache->bic_devs) {
166 dev = list_entry(iter->p, struct blkid_struct_dev, bid_devs);
167 iter->p = iter->p->next;
168 if (iter->search_type &&
169 !blkid_dev_has_tag(dev, iter->search_type,
178 extern void blkid_dev_iterate_end(blkid_dev_iterate iter)
180 if (!iter || iter->magic != DEV_ITERATE_MAGIC)
194 void usage(char *prog)
196 fprintf(stderr, "Usage: %s [-f blkid_file] [-m debug_mask]\n", prog);
197 fprintf(stderr, "\tList all devices and exit\n");
201 int main(int argc, char **argv)
203 blkid_dev_iterate iter;
204 blkid_cache cache = NULL;
209 char *search_type = NULL;
210 char *search_value = NULL;
212 while ((c = getopt (argc, argv, "m:f:")) != EOF)
218 blkid_debug_mask = strtoul (optarg, &tmp, 0);
220 fprintf(stderr, "Invalid debug mask: %s\n",
228 if (argc >= optind+2) {
229 search_type = argv[optind];
230 search_value = argv[optind+1];
236 if ((ret = blkid_get_cache(&cache, file)) != 0) {
237 fprintf(stderr, "%s: error creating cache (%d)\n",
242 iter = blkid_dev_iterate_begin(cache);
244 blkid_dev_set_search(iter, search_type, search_value);
245 while (blkid_dev_next(iter, &dev) == 0) {
246 printf("Device: %s\n", blkid_dev_devname(dev));
248 blkid_dev_iterate_end(iter);
251 blkid_put_cache(cache);