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126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
/*
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* cache.c - allocation/initialization/free routines for cache
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*
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* Copyright (C) 2001 Andreas Dilger
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* Copyright (C) 2003 Theodore Ts'o
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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* %End-Header%
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "blkidP.h"
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int blkid_debug_mask = 0;
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int blkid_get_cache(blkid_cache *ret_cache, const char *filename)
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{
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blkid_cache cache;
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#ifdef CONFIG_BLKID_DEBUG
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if (!(blkid_debug_mask & DEBUG_INIT)) {
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char *dstr = getenv("BLKID_DEBUG");
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if (dstr)
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blkid_debug_mask = strtoul(dstr, 0, 0);
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blkid_debug_mask |= DEBUG_INIT;
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}
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#endif
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DBG(DEBUG_CACHE, printf("creating blkid cache (using %s)\n",
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filename ? filename : "default cache"));
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if (!(cache = (blkid_cache) calloc(1, sizeof(struct blkid_struct_cache))))
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return -BLKID_ERR_MEM;
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INIT_LIST_HEAD(&cache->bic_devs);
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INIT_LIST_HEAD(&cache->bic_tags);
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if (filename && !strlen(filename))
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filename = 0;
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if (!filename && (getuid() == geteuid()))
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filename = getenv("BLKID_FILE");
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if (!filename)
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filename = BLKID_CACHE_FILE;
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cache->bic_filename = blkid_strdup(filename);
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blkid_read_cache(cache);
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*ret_cache = cache;
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return 0;
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}
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void blkid_put_cache(blkid_cache cache)
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{
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if (!cache)
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return;
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(void) blkid_flush_cache(cache);
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DBG(DEBUG_CACHE, printf("freeing cache struct\n"));
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/* DBG(DEBUG_CACHE, blkid_debug_dump_cache(cache)); */
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while (!list_empty(&cache->bic_devs)) {
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blkid_dev dev = list_entry(cache->bic_devs.next,
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struct blkid_struct_dev,
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bid_devs);
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blkid_free_dev(dev);
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}
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while (!list_empty(&cache->bic_tags)) {
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blkid_tag tag = list_entry(cache->bic_tags.next,
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struct blkid_struct_tag,
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bit_tags);
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while (!list_empty(&tag->bit_names)) {
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blkid_tag bad = list_entry(tag->bit_names.next,
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struct blkid_struct_tag,
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bit_names);
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DBG(DEBUG_CACHE, printf("warning: unfreed tag %s=%s\n",
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bad->bit_name, bad->bit_val));
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blkid_free_tag(bad);
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}
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blkid_free_tag(tag);
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}
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free(cache->bic_filename);
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free(cache);
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}
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#ifdef TEST_PROGRAM
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int main(int argc, char** argv)
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{
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blkid_cache cache = NULL;
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int ret;
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blkid_debug_mask = DEBUG_ALL;
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if ((argc > 2)) {
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fprintf(stderr, "Usage: %s [filename] \n", argv[0]);
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exit(1);
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}
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if ((ret = blkid_get_cache(&cache, argv[1])) < 0) {
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fprintf(stderr, "error %d parsing cache file %s\n", ret,
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argv[1] ? argv[1] : BLKID_CACHE_FILE);
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exit(1);
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}
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if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
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fprintf(stderr, "%s: error creating cache (%d)\n",
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argv[0], ret);
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exit(1);
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}
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if ((ret = blkid_probe_all(cache) < 0))
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fprintf(stderr, "error probing devices\n");
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blkid_put_cache(cache);
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return ret;
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}
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#endif
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