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-rw-r--r--libblkid/src/dev.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/libblkid/src/dev.c b/libblkid/src/dev.c
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--- /dev/null
+++ b/libblkid/src/dev.c
@@ -0,0 +1,279 @@
+/*
+ * dev.c - allocation/initialization/free routines for dev
+ *
+ * Copyright (C) 2001 Andreas Dilger
+ * Copyright (C) 2003 Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ * %End-Header%
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "blkidP.h"
+
+/*
+ * NOTE: reference manual is not structured as code. The following section is a generic
+ * section for all high-level cache search+iterate routines.
+ */
+
+/**
+ * SECTION:search
+ * @title: Search and iterate
+ * @short_description: search devices and iterate over devices in the cache.
+ *
+ * Note that high-level probing API provides information about superblocks
+ * (filesystems/raids) only. For partitions and topology is necessary to use
+ * the low-level API.
+ */
+
+blkid_dev blkid_new_dev(void)
+{
+ blkid_dev dev;
+
+ if (!(dev = calloc(1, sizeof(struct blkid_struct_dev))))
+ return NULL;
+
+ DBG(DEV, ul_debugobj(dev, "alloc"));
+ INIT_LIST_HEAD(&dev->bid_devs);
+ INIT_LIST_HEAD(&dev->bid_tags);
+
+ return dev;
+}
+
+void blkid_free_dev(blkid_dev dev)
+{
+ if (!dev)
+ return;
+
+ DBG(DEV, ul_debugobj(dev, "freeing (%s)", dev->bid_name));
+
+ list_del(&dev->bid_devs);
+ while (!list_empty(&dev->bid_tags)) {
+ blkid_tag tag = list_entry(dev->bid_tags.next,
+ struct blkid_struct_tag,
+ bit_tags);
+ blkid_free_tag(tag);
+ }
+ free(dev->bid_xname);
+ free(dev->bid_name);
+ free(dev);
+}
+
+/*
+ * Given a blkid device, return its name. The function returns the name
+ * previously used for blkid_get_dev(). This name does not have to be canonical
+ * (real path) name, but for example symlink.
+ */
+const char *blkid_dev_devname(blkid_dev dev)
+{
+ if (!dev)
+ return NULL;
+ if (dev->bid_xname)
+ return dev->bid_xname;
+ return dev->bid_name;
+}
+
+void blkid_debug_dump_dev(blkid_dev dev)
+{
+ struct list_head *p;
+
+ if (!dev) {
+ printf(" dev: NULL\n");
+ return;
+ }
+
+ fprintf(stderr, " dev: name = %s\n", dev->bid_name);
+ fprintf(stderr, " dev: DEVNO=\"0x%0lx\"\n", (unsigned long)dev->bid_devno);
+ fprintf(stderr, " dev: TIME=\"%lld.%lld\"\n", (long long)dev->bid_time, (long long)dev->bid_utime);
+ fprintf(stderr, " dev: PRI=\"%d\"\n", dev->bid_pri);
+ fprintf(stderr, " dev: flags = 0x%08X\n", dev->bid_flags);
+
+ list_for_each(p, &dev->bid_tags) {
+ blkid_tag tag = list_entry(p, struct blkid_struct_tag, bit_tags);
+ if (tag)
+ fprintf(stderr, " tag: %s=\"%s\"\n", tag->bit_name,
+ tag->bit_val);
+ else
+ fprintf(stderr, " tag: NULL\n");
+ }
+}
+
+/*
+ * dev iteration routines for the public libblkid interface.
+ *
+ * These routines do not expose the list.h implementation, which are a
+ * contamination of the namespace, and which force us to reveal far, far
+ * too much of our internal implementation. I'm not convinced I want
+ * to keep list.h in the long term, anyway. It's fine for kernel
+ * programming, but performance is not the #1 priority for this
+ * library, and I really don't like the trade-off of type-safety for
+ * performance for this application. [tytso:20030125.2007EST]
+ */
+
+/*
+ * This series of functions iterate over all devices in a blkid cache
+ */
+#define DEV_ITERATE_MAGIC 0x01a5284c
+
+struct blkid_struct_dev_iterate {
+ int magic;
+ blkid_cache cache;
+ char *search_type;
+ char *search_value;
+ struct list_head *p;
+};
+
+blkid_dev_iterate blkid_dev_iterate_begin(blkid_cache cache)
+{
+ blkid_dev_iterate iter;
+
+ if (!cache) {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ iter = malloc(sizeof(struct blkid_struct_dev_iterate));
+ if (iter) {
+ iter->magic = DEV_ITERATE_MAGIC;
+ iter->cache = cache;
+ iter->p = cache->bic_devs.next;
+ iter->search_type = NULL;
+ iter->search_value = NULL;
+ }
+ return iter;
+}
+
+int blkid_dev_set_search(blkid_dev_iterate iter,
+ const char *search_type, const char *search_value)
+{
+ char *new_type, *new_value;
+
+ if (!iter || iter->magic != DEV_ITERATE_MAGIC || !search_type ||
+ !search_value)
+ return -1;
+ new_type = malloc(strlen(search_type)+1);
+ new_value = malloc(strlen(search_value)+1);
+ if (!new_type || !new_value) {
+ free(new_type);
+ free(new_value);
+ return -1;
+ }
+ strcpy(new_type, search_type);
+ strcpy(new_value, search_value);
+ free(iter->search_type);
+ free(iter->search_value);
+ iter->search_type = new_type;
+ iter->search_value = new_value;
+ return 0;
+}
+
+/*
+ * Return 0 on success, -1 on error
+ */
+int blkid_dev_next(blkid_dev_iterate iter,
+ blkid_dev *ret_dev)
+{
+ blkid_dev dev;
+
+ if (!ret_dev || !iter || iter->magic != DEV_ITERATE_MAGIC)
+ return -1;
+ *ret_dev = NULL;
+ while (iter->p != &iter->cache->bic_devs) {
+ dev = list_entry(iter->p, struct blkid_struct_dev, bid_devs);
+ iter->p = iter->p->next;
+ if (iter->search_type &&
+ !blkid_dev_has_tag(dev, iter->search_type,
+ iter->search_value))
+ continue;
+ *ret_dev = dev;
+ return 0;
+ }
+ return -1;
+}
+
+void blkid_dev_iterate_end(blkid_dev_iterate iter)
+{
+ if (!iter || iter->magic != DEV_ITERATE_MAGIC)
+ return;
+ iter->magic = 0;
+ free(iter->search_type);
+ free(iter->search_value);
+ free(iter);
+}
+
+#ifdef TEST_PROGRAM
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern char *optarg;
+extern int optind;
+#endif
+
+static void __attribute__((__noreturn__)) usage(char *prog)
+{
+ fprintf(stderr, "Usage: %s [-f blkid_file] [-m debug_mask]\n", prog);
+ fprintf(stderr, "\tList all devices and exit\n");
+ exit(1);
+}
+
+int main(int argc, char **argv)
+{
+ blkid_dev_iterate iter;
+ blkid_cache cache = NULL;
+ blkid_dev dev;
+ int c, ret;
+ char *tmp;
+ char *file = NULL;
+ char *search_type = NULL;
+ char *search_value = NULL;
+
+ while ((c = getopt (argc, argv, "m:f:")) != EOF)
+ switch (c) {
+ case 'f':
+ file = optarg;
+ break;
+ case 'm':
+ {
+ int mask = strtoul (optarg, &tmp, 0);
+ if (*tmp) {
+ fprintf(stderr, "Invalid debug mask: %s\n",
+ optarg);
+ exit(1);
+ }
+ blkid_init_debug(mask);
+ break;
+ }
+ case '?':
+ usage(argv[0]);
+ }
+ if (argc >= optind+2) {
+ search_type = argv[optind];
+ search_value = argv[optind+1];
+ optind += 2;
+ }
+ if (argc != optind)
+ usage(argv[0]);
+
+ if ((ret = blkid_get_cache(&cache, file)) != 0) {
+ fprintf(stderr, "%s: error creating cache (%d)\n",
+ argv[0], ret);
+ exit(1);
+ }
+
+ iter = blkid_dev_iterate_begin(cache);
+ if (search_type)
+ blkid_dev_set_search(iter, search_type, search_value);
+ while (blkid_dev_next(iter, &dev) == 0) {
+ printf("Device: %s\n", blkid_dev_devname(dev));
+ }
+ blkid_dev_iterate_end(iter);
+
+
+ blkid_put_cache(cache);
+ return (0);
+}
+#endif