Use the 'VBID' virtio-blk ioctl to extract drive serial numbers to be used for building disk/by-id symlinks. After extracting the serial number of the device it prints out the minimum info needed in a similar format to `scsi_id --export` so that the persistent-storage rules can process the serial information. This program depends on the virtio-blk serial device patches posted here[1] being applied to qemu and linux-kernel. Here is what the output looks like: % ./virtioblk_id /dev/vdb ID_VIRTIO=1 ID_TYPE=disk ID_SERIAL=QM00001 ID_SERIAL_SHORT=QM00001 1. http://lists.gnu.org/archive/html/qemu-devel/2010-03/msg01869.html Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx> --- Makefile.am | 7 +++ extras/virtioblk_id/virtioblk_id.c | 83 ++++++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+), 0 deletions(-) create mode 100644 extras/virtioblk_id/virtioblk_id.c diff --git a/Makefile.am b/Makefile.am index bafe4c7..6b8f41b 100644 --- a/Makefile.am +++ b/Makefile.am @@ -251,6 +251,13 @@ extras_path_id_path_id_LDADD = libudev/libudev-private.la libexec_PROGRAMS += extras/path_id/path_id # ------------------------------------------------------------------------------ +# virtioblk_id - virtioblk inquery to extract disk serial numbers +# ------------------------------------------------------------------------------ +extras_virtioblk_id_virtioblk_id_SOURCES = extras/virtioblk_id/virtioblk_id.c +extras_virtioblk_id_virtioblk_id_LDADD = libudev/libudev-private.la +libexec_PROGRAMS += extras/virtioblk_id/virtioblk_id + +# ------------------------------------------------------------------------------ # fstab_import - import /etc/fstab entry for block device # ------------------------------------------------------------------------------ extras_fstab_import_fstab_import_SOURCES = extras/fstab_import/fstab_import.c diff --git a/extras/virtioblk_id/virtioblk_id.c b/extras/virtioblk_id/virtioblk_id.c new file mode 100644 index 0000000..be9ff2e --- /dev/null +++ b/extras/virtioblk_id/virtioblk_id.c @@ -0,0 +1,83 @@ +/* + * extract disk serial from virtio-blk devices + * and print enough values to allow udev to create disk/by-id/ symlinks + * + * Copyright IBM, Corp. 2010 + * + * Authors: + * John Cooper <john.cooper@xxxxxxxxxx> + * Ryan Harper <ryanh@xxxxxxxxxx> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include <stdio.h> +#include <strings.h> +#include <sys/types.h> +#include <fcntl.h> +#include <linux/hdreg.h> +#include <getopt.h> + +/* virtio-blk VBID ioctl */ +#define IOCTL_CMD 0x56424944 + +int main(int argc, char **argv) +{ + int fd, rv; + const char *device; + char buf[255]; + + int opt_debug = 0; + static const char *option_string = "d"; + static struct option options[] = { + {"debug", 0, NULL, 'd'}, + {"help", 0, NULL, 'h'}, + {0, 0, NULL, 0} + }; + + while (1) { + int option; + option = getopt_long(argc, argv, "dh", options, NULL); + if (option == -1) + break; + switch (option) { + case 'd': + opt_debug = 1; + break; + case 'h': + printf("Usage: virtioblk_id [--debug] [--help] <device>\n" + " --debug print debugging information\n" + " --help print this help text\n\n"); + default: + rv = 1; + goto exit; + } + } + + device = argv[optind]; + if (device == NULL) { + fprintf(stderr, "no device specified\n"); + rv = 1; + goto exit; + } + + + bzero(buf, sizeof (buf)); + if ((fd = open(device, O_RDONLY)) < 0) { + if (opt_debug == 1) + perror("open"); + } else if ((rv = ioctl(fd, IOCTL_CMD, buf)) < 0) { + if (opt_debug == 1) + perror("ioctl"); + } else { + printf("ID_VIRTIO=1\n"); + printf("ID_TYPE=disk\n"); + printf("ID_SERIAL=%s\n", buf); + printf("ID_SERIAL_SHORT=%s\n", buf); + rv = 0; + } + + exit: + return rv; +} -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
