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  • Committer: Package Import Robot
  • Author(s): Robie Basak
  • Date: 2014-09-29 10:13:58 UTC
  • Revision ID: package-import@ubuntu.com-20140929101358-49cxzqbrsi3d3l4c
Tags: upstream-1.0.7
Import upstream version 1.0.7

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probe-bcache.c
 
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/*
 
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 * Author: Kent Overstreet <kmo@daterainc.com>
 
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 *
 
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 * GPLv2
 
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 */
 
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#define _FILE_OFFSET_BITS       64
 
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#define __USE_FILE_OFFSET64
 
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#define _XOPEN_SOURCE 500
 
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#include <blkid.h>
 
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#include <fcntl.h>
 
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#include <linux/fs.h>
 
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#include <stdbool.h>
 
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#include <stdint.h>
 
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#include <stdio.h>
 
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#include <stdlib.h>
 
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#include <string.h>
 
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#include <sys/ioctl.h>
 
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#include <sys/types.h>
 
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#include <sys/stat.h>
 
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#include <unistd.h>
 
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#include <uuid/uuid.h>
 
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#include "bcache.h"
 
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int main(int argc, char **argv)
 
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{
 
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        bool udev = false;
 
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        int i, o;
 
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        extern char *optarg;
 
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        struct cache_sb sb;
 
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        char uuid[40];
 
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        blkid_probe pr;
 
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        while ((o = getopt(argc, argv, "o:")) != EOF)
 
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                switch (o) {
 
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                case 'o':
 
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                        if (strcmp("udev", optarg)) {
 
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                                printf("Invalid output format %s\n", optarg);
 
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                                exit(EXIT_FAILURE);
 
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                        }
 
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                        udev = true;
 
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                        break;
 
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                }
 
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        argv += optind;
 
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        argc -= optind;
 
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        for (i = 0; i < argc; i++) {
 
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                int fd = open(argv[i], O_RDONLY);
 
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                if (fd == -1)
 
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                        continue;
 
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                if (!(pr = blkid_new_probe()))
 
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                        continue;
 
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                if (blkid_probe_set_device(pr, fd, 0, 0))
 
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                        continue;
 
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                /* probe partitions too */
 
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                if (blkid_probe_enable_partitions(pr, true))
 
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                        continue;
 
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                /* bail if anything was found
 
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                 * probe-bcache isn't needed once blkid recognizes bcache */
 
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                if (!blkid_do_probe(pr)) {
 
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                        continue;
 
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                }
 
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                if (pread(fd, &sb, sizeof(sb), SB_START) != sizeof(sb))
 
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                        continue;
 
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                if (memcmp(sb.magic, bcache_magic, 16))
 
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                        continue;
 
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                uuid_unparse(sb.uuid, uuid);
 
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                if (udev)
 
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                        printf("ID_FS_UUID=%s\n"
 
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                               "ID_FS_UUID_ENC=%s\n"
 
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                               "ID_FS_TYPE=bcache\n",
 
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                               uuid, uuid);
 
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                else
 
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                        printf("%s: UUID=\"\" TYPE=\"bcache\"\n", uuid);
 
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        }
 
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        return 0;
 
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}