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util-linux/libblkid/src/dev.c

279 lines
6.3 KiB

/*
* 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%0llx\"\n", (long long)dev->bid_devno);
fprintf(stderr, " dev: TIME=\"%ld.%ld\"\n", (long)dev->bid_time, (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 = 0;
iter->search_value = 0;
}
return iter;
}
int blkid_dev_set_search(blkid_dev_iterate iter,
char *search_type, 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 = 0;
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