cache.c revision efc6f628e15de95bcd13e4f0ee223cb42115d520
1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * cache.c - allocation/initialization/free routines for cache 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * Copyright (C) 2001 Andreas Dilger 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * Copyright (C) 2003 Theodore Ts'o 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * %Begin-Header% 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * This file may be redistributed under the terms of the 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * GNU Lesser General Public License. 10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown * %End-Header% 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown */ 12436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if HAVE_UNISTD_H 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <unistd.h> 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef HAVE_ERRNO_H 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <errno.h> 18436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov#endif 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdlib.h> 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <string.h> 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef HAVE_SYS_PRCTL_H 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/prctl.h> 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#define PR_GET_DUMPABLE 3 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if (!defined(HAVE_PRCTL) && defined(linux)) 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/syscall.h> 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef HAVE_SYS_STAT_H 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/stat.h> 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "blkidP.h" 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint blkid_debug_mask = 0; 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic char *safe_getenv(const char *arg) 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((getuid() != geteuid()) || (getgid() != getegid())) 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return NULL; 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if HAVE_PRCTL 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0) 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return NULL; 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if (defined(linux) && defined(SYS_prctl)) 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0) 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return NULL; 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef HAVE___SECURE_GETENV 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return __secure_getenv(arg); 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return getenv(arg); 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if 0 /* ifdef CONFIG_BLKID_DEBUG */ 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic blkid_debug_dump_cache(int mask, blkid_cache cache) 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct list_head *p; 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!cache) { 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("cache: NULL\n"); 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return; 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("cache: time = %lu\n", cache->bic_time); 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("cache: flags = 0x%08X\n", cache->bic_flags); 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown list_for_each(p, &cache->bic_devs) { 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_dev dev = list_entry(p, struct blkid_struct_dev, bid_devs); 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_debug_dump_dev(dev); 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint blkid_get_cache(blkid_cache *ret_cache, const char *filename) 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_cache cache; 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef CONFIG_BLKID_DEBUG 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!(blkid_debug_mask & DEBUG_INIT)) { 84436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov char *dstr = getenv("BLKID_DEBUG"); 85436e89c602e787e7a27dd6624b09beed41a0da8aDmitriy Ivanov 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (dstr) 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_debug_mask = strtoul(dstr, 0, 0); 88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_debug_mask |= DEBUG_INIT; 89ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown DBG(DEBUG_CACHE, printf("creating blkid cache (using %s)\n", 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown filename ? filename : "default cache")); 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!(cache = (blkid_cache) calloc(1, sizeof(struct blkid_struct_cache)))) 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return -BLKID_ERR_MEM; 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown INIT_LIST_HEAD(&cache->bic_devs); 99ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown INIT_LIST_HEAD(&cache->bic_tags); 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (filename && !strlen(filename)) 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown filename = 0; 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!filename) 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown filename = safe_getenv("BLKID_FILE"); 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!filename) 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown filename = BLKID_CACHE_FILE; 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown cache->bic_filename = blkid_strdup(filename); 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_read_cache(cache); 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *ret_cache = cache; 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return 0; 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid blkid_put_cache(blkid_cache cache) 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!cache) 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return; 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown (void) blkid_flush_cache(cache); 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown DBG(DEBUG_CACHE, printf("freeing cache struct\n")); 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* DBG(DEBUG_CACHE, blkid_debug_dump_cache(cache)); */ 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown while (!list_empty(&cache->bic_devs)) { 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_dev dev = list_entry(cache->bic_devs.next, 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct blkid_struct_dev, 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bid_devs); 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_free_dev(dev); 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 132ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown while (!list_empty(&cache->bic_tags)) { 134ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_tag tag = list_entry(cache->bic_tags.next, 135ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct blkid_struct_tag, 136ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bit_tags); 137ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 138ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown while (!list_empty(&tag->bit_names)) { 139ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_tag bad = list_entry(tag->bit_names.next, 140ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct blkid_struct_tag, 141ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bit_names); 142ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 143ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown DBG(DEBUG_CACHE, printf("warning: unfreed tag %s=%s\n", 144ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bad->bit_name, bad->bit_val)); 145ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_free_tag(bad); 146ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 147ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_free_tag(tag); 148ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 149ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (cache->bic_filename) 150ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown free(cache->bic_filename); 151ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 152ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown free(cache); 153ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 154ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 155ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid blkid_gc_cache(blkid_cache cache) 156ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 157ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct list_head *p, *pnext; 158ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct stat st; 159ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 160ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!cache) 161ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return; 162ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 163ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown list_for_each_safe(p, pnext, &cache->bic_devs) { 164ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_dev dev = list_entry(p, struct blkid_struct_dev, bid_devs); 165ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!p) 166ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown break; 167ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (stat(dev->bid_name, &st) < 0) { 168ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown DBG(DEBUG_CACHE, 169ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("freeing %s\n", dev->bid_name)); 170ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_free_dev(dev); 171ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown cache->bic_flags |= BLKID_BIC_FL_CHANGED; 172ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else { 173ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown DBG(DEBUG_CACHE, 174ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("Device %s exists\n", dev->bid_name)); 175ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 176ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 177ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 178ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 179ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 180ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef TEST_PROGRAM 181ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint main(int argc, char** argv) 182ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 183ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_cache cache = NULL; 184ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int ret; 185ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 186ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_debug_mask = DEBUG_ALL; 187ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((argc > 2)) { 188ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown fprintf(stderr, "Usage: %s [filename] \n", argv[0]); 189ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(1); 190ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 191ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 192ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((ret = blkid_get_cache(&cache, argv[1])) < 0) { 193ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown fprintf(stderr, "error %d parsing cache file %s\n", ret, 194ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown argv[1] ? argv[1] : BLKID_CACHE_FILE); 195ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(1); 196ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 197ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { 198ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown fprintf(stderr, "%s: error creating cache (%d)\n", 199ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown argv[0], ret); 200ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(1); 201ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 202ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((ret = blkid_probe_all(cache) < 0)) 203ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown fprintf(stderr, "error probing devices\n"); 204ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 205ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown blkid_put_cache(cache); 206ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 207ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return ret; 208ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 209ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 210ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown