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authorKent Overstreet <kent.overstreet@gmail.com>2010-10-08 07:04:49 -0700
committerKent Overstreet <kent.overstreet@gmail.com>2010-10-08 07:04:49 -0700
commit7e9790107563dfa88ccd89aa0d0fa33266848400 (patch)
treea1418f8289ca916ba329756fec003c66ac024d09 /probe-bcache.c
parent1d895a5a451e041fcefeefbe1fd07eed034394cd (diff)
UUIDs
Diffstat (limited to 'probe-bcache.c')
-rw-r--r--probe-bcache.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/probe-bcache.c b/probe-bcache.c
new file mode 100644
index 0000000..ec81ea7
--- /dev/null
+++ b/probe-bcache.c
@@ -0,0 +1,67 @@
+#define _FILE_OFFSET_BITS 64
+#define __USE_FILE_OFFSET64
+#define _XOPEN_SOURCE 500
+
+#include <fcntl.h>
+#include <linux/fs.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <uuid/uuid.h>
+
+#include "bcache.h"
+
+int main(int argc, char **argv)
+{
+ bool udev = false;
+ int i, o;
+ extern char *optarg;
+ struct cache_sb sb;
+ char uuid[40];
+
+ while ((o = getopt(argc, argv, "o:")) != EOF)
+ switch (o) {
+ case 'o':
+ if (strcmp("udev", optarg)) {
+ printf("Invalid output format %s\n", optarg);
+ exit(EXIT_FAILURE);
+ }
+ udev = true;
+ break;
+ }
+
+
+ argv += optind;
+ argc -= optind;
+
+ for (i = 0; i < argc; i++) {
+ int fd = open(argv[i], O_RDONLY);
+ if (fd == -1)
+ continue;
+
+
+ if (pread(fd, &sb, sizeof(sb), 4096) != sizeof(sb))
+ continue;
+
+ if (memcmp(sb.magic, bcache_magic, 16))
+ continue;
+
+ uuid_unparse(sb.uuid, uuid);
+
+ if (udev)
+ printf("ID_FS_UUID=%s\n"
+ "ID_FS_UUID_ENC=%s\n"
+ "ID_FS_TYPE=bcache\n",
+ uuid, uuid);
+ else
+ printf("%s: UUID=\"\" TYPE=\"bcache\"\n", uuid);
+ }
+
+ return 0;
+}