diff options
Diffstat (limited to 'libblkid/verify.c')
| -rw-r--r-- | libblkid/verify.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/libblkid/verify.c b/libblkid/verify.c deleted file mode 100644 index bd756e7a7..000000000 --- a/libblkid/verify.c +++ /dev/null @@ -1,221 +0,0 @@ -/* - * Copyright (C) 2008 Karel Zak <kzak@redhat.com> - * - * This file may be redistributed under the terms of the - * GNU Lesser General Public License. - */ - -#include <stdio.h> -#include <string.h> -#include <stdlib.h> -#include <unistd.h> -#include <fcntl.h> -#include <time.h> -#include <sys/time.h> -#include <sys/types.h> -#ifdef HAVE_SYS_STAT_H -#include <sys/stat.h> -#endif -#ifdef HAVE_ERRNO_H -#include <errno.h> -#endif -#include "blkidP.h" - -static void blkid_probe_to_tags(blkid_probe pr, blkid_dev dev) -{ - const char *data; - const char *name; - int nvals, n; - size_t len; - - nvals = blkid_probe_numof_values(pr); - - for (n = 0; n < nvals; n++) { - if (blkid_probe_get_value(pr, n, &name, &data, &len) != 0) - continue; - if (strncmp(name, "PART_ENTRY_", 11) == 0) { - if (strcmp(name, "PART_ENTRY_UUID") == 0) - blkid_set_tag(dev, "PARTUUID", data, len); - else if (strcmp(name, "PART_ENTRY_NAME") == 0) - blkid_set_tag(dev, "PARTLABEL", data, len); - - } else if (!strstr(name, "_ID")) { - /* superblock UUID, LABEL, ... - * but not {SYSTEM,APPLICATION,..._ID} */ - blkid_set_tag(dev, name, data, len); - } - } -} - -/* - * Verify that the data in dev is consistent with what is on the actual - * block device (using the devname field only). Normally this will be - * called when finding items in the cache, but for long running processes - * is also desirable to revalidate an item before use. - * - * If we are unable to revalidate the data, we return the old data and - * do not set the BLKID_BID_FL_VERIFIED flag on it. - */ -blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) -{ - blkid_tag_iterate iter; - const char *type, *value; - struct stat st; - time_t diff, now; - int fd; - - if (!dev || !cache) - return NULL; - - now = time(0); - diff = now - dev->bid_time; - - if (stat(dev->bid_name, &st) < 0) { - DBG(DEBUG_PROBE, - printf("blkid_verify: error %m (%d) while " - "trying to stat %s\n", errno, - dev->bid_name)); - open_err: - if ((errno == EPERM) || (errno == EACCES) || (errno == ENOENT)) { - /* We don't have read permission, just return cache data. */ - DBG(DEBUG_PROBE, printf("returning unverified data for %s\n", - dev->bid_name)); - return dev; - } - blkid_free_dev(dev); - return NULL; - } - - if (now >= dev->bid_time && -#ifdef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC - (st.st_mtime < dev->bid_time || - (st.st_mtime == dev->bid_time && - st.st_mtim.tv_nsec / 1000 <= dev->bid_utime)) && -#else - st.st_mtime <= dev->bid_time && -#endif - (diff < BLKID_PROBE_MIN || - (dev->bid_flags & BLKID_BID_FL_VERIFIED && - diff < BLKID_PROBE_INTERVAL))) - return dev; - -#ifndef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC - DBG(DEBUG_PROBE, - printf("need to revalidate %s (cache time %lu, stat time %lu,\n\t" - "time since last check %lu)\n", - dev->bid_name, (unsigned long)dev->bid_time, - (unsigned long)st.st_mtime, (unsigned long)diff)); -#else - DBG(DEBUG_PROBE, - printf("need to revalidate %s (cache time %lu.%lu, stat time %lu.%lu,\n\t" - "time since last check %lu)\n", - dev->bid_name, - (unsigned long)dev->bid_time, (unsigned long)dev->bid_utime, - (unsigned long)st.st_mtime, (unsigned long)st.st_mtim.tv_nsec / 1000, - (unsigned long)diff)); -#endif - - if (!cache->probe) { - cache->probe = blkid_new_probe(); - if (!cache->probe) { - blkid_free_dev(dev); - return NULL; - } - } - - fd = open(dev->bid_name, O_RDONLY|O_CLOEXEC); - if (fd < 0) { - DBG(DEBUG_PROBE, printf("blkid_verify: error %m (%d) while " - "opening %s\n", errno, - dev->bid_name)); - goto open_err; - } - - if (blkid_probe_set_device(cache->probe, fd, 0, 0)) { - /* failed to read the device */ - close(fd); - blkid_free_dev(dev); - return NULL; - } - - /* remove old cache info */ - iter = blkid_tag_iterate_begin(dev); - while (blkid_tag_next(iter, &type, &value) == 0) - blkid_set_tag(dev, type, NULL, 0); - blkid_tag_iterate_end(iter); - - /* enable superblocks probing */ - blkid_probe_enable_superblocks(cache->probe, TRUE); - blkid_probe_set_superblocks_flags(cache->probe, - BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID | - BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE); - - /* enable partitions probing */ - blkid_probe_enable_partitions(cache->probe, TRUE); - blkid_probe_set_partitions_flags(cache->probe, BLKID_PARTS_ENTRY_DETAILS); - - /* probe */ - if (blkid_do_safeprobe(cache->probe)) { - /* found nothing or error */ - blkid_free_dev(dev); - dev = NULL; - } - - if (dev) { -#ifdef HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC - struct timeval tv; - if (!gettimeofday(&tv, NULL)) { - dev->bid_time = tv.tv_sec; - dev->bid_utime = tv.tv_usec; - } else -#endif - dev->bid_time = time(0); - - dev->bid_devno = st.st_rdev; - dev->bid_flags |= BLKID_BID_FL_VERIFIED; - cache->bic_flags |= BLKID_BIC_FL_CHANGED; - - blkid_probe_to_tags(cache->probe, dev); - - DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", - dev->bid_name, (long long)st.st_rdev, dev->bid_type)); - } - - blkid_reset_probe(cache->probe); - blkid_probe_reset_superblocks_filter(cache->probe); - close(fd); - return dev; -} - -#ifdef TEST_PROGRAM -int main(int argc, char **argv) -{ - blkid_dev dev; - blkid_cache cache; - int ret; - - if (argc != 2) { - fprintf(stderr, "Usage: %s device\n" - "Probe a single device to determine type\n", argv[0]); - exit(1); - } - if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { - fprintf(stderr, "%s: error creating cache (%d)\n", - argv[0], ret); - exit(1); - } - dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); - if (!dev) { - printf("%s: %s has an unsupported type\n", argv[0], argv[1]); - return (1); - } - printf("TYPE='%s'\n", dev->bid_type ? dev->bid_type : "(null)"); - if (dev->bid_label) - printf("LABEL='%s'\n", dev->bid_label); - if (dev->bid_uuid) - printf("UUID='%s'\n", dev->bid_uuid); - - blkid_free_dev(dev); - return (0); -} -#endif |