/* vi: set sw=4 ts=4: */ /* * 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" blkid_dev blkid_new_dev(void) { blkid_dev dev; dev = xzalloc(sizeof(struct blkid_struct_dev)); 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(DEBUG_DEV, printf(" freeing dev %s (%s)\n", dev->bid_name, dev->bid_type)); DBG(DEBUG_DEV, blkid_debug_dump_dev(dev)); 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); } if (dev->bid_name) free(dev->bid_name); free(dev); } /* * Given a blkid device, return its name */ const char *blkid_dev_devname(blkid_dev dev) { return dev->bid_name; } #ifdef CONFIG_BLKID_DEBUG void blkid_debug_dump_dev(blkid_dev dev) { struct list_head *p; if (!dev) { printf(" dev: NULL\n"); return; } printf(" dev: name = %s\n", dev->bid_name); printf(" dev: DEVNO=\"0x%0llx\"\n", dev->bid_devno); printf(" dev: TIME=\"%lu\"\n", dev->bid_time); printf(" dev: PRI=\"%d\"\n", dev->bid_pri); printf(" 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) printf(" tag: %s=\"%s\"\n", tag->bit_name, tag->bit_val); else printf(" tag: NULL\n"); } bb_putchar('\n'); } #endif /* * 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 implemenation. 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 tradeoff 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; struct list_head *p; }; blkid_dev_iterate blkid_dev_iterate_begin(blkid_cache cache) { blkid_dev_iterate iter; iter = xmalloc(sizeof(struct blkid_struct_dev_iterate)); iter->magic = DEV_ITERATE_MAGIC; iter->cache = cache; iter->p = cache->bic_devs.next; return iter; } /* * Return 0 on success, -1 on error */ extern int blkid_dev_next(blkid_dev_iterate iter, blkid_dev *dev) { *dev = 0; if (!iter || iter->magic != DEV_ITERATE_MAGIC || iter->p == &iter->cache->bic_devs) return -1; *dev = list_entry(iter->p, struct blkid_struct_dev, bid_devs); iter->p = iter->p->next; return 0; } void blkid_dev_iterate_end(blkid_dev_iterate iter) { if (!iter || iter->magic != DEV_ITERATE_MAGIC) return; iter->magic = 0; free(iter); } #ifdef TEST_PROGRAM #ifdef HAVE_GETOPT_H #include <getopt.h> #else extern char *optarg; extern int optind; #endif void usage(char *prog) { fprintf(stderr, "Usage: %s [-f blkid_file] [-m debug_mask]\n", prog); fprintf(stderr, "\tList all devices and exit\n", prog); 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': blkid_debug_mask = strtoul (optarg, &tmp, 0); if (*tmp) { fprintf(stderr, "Invalid debug mask: %d\n", optarg); exit(1); } 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