mirror of
https://github.com/koverstreet/bcachefs-tools.git
synced 2025-01-23 00:07:07 +03:00
0c7a484a5b
Move the rule to run a bit later, after the standard udev rules have called blkid. Don't run blkid manually, and run probe-bcache as a fallback which can be patched out in a package that depends on util-linux 2.24+. probe-bcache: bail if libblkid finds anything Preserve our last-resort safety check here in case earlier rules fail to call blkid.
88 lines
1.6 KiB
C
88 lines
1.6 KiB
C
/*
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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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}
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