| /* |
| * Evms topology |
| * -- this is fallback for old systems where the toplogy information are not |
| * exporte dy sysfs |
| * |
| * Copyright (C) 2009 Karel Zak <kzak@redhat.com> |
| * |
| * This file may be redistributed under the terms of the |
| * GNU Lesser General Public License. |
| * |
| */ |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "topology.h" |
| |
| #define EVMS_MAJOR 117 |
| #define EVMS_GET_STRIPE_INFO _IOR(EVMS_MAJOR, 0xF0, struct evms_stripe_info) |
| |
| struct evms_stripe_info { |
| u_int32_t size; /* stripe unit 512-byte blocks */ |
| u_int32_t width; /* the number of stripe members or RAID data disks */ |
| } evms_stripe_info; |
| |
| static int is_evms_device(dev_t devno) |
| { |
| if (major(devno) == EVMS_MAJOR) |
| return 1; |
| return blkid_driver_has_major("evms", major(devno)); |
| } |
| |
| static int probe_evms_tp(blkid_probe pr, const struct blkid_idmag *mag) |
| { |
| struct evms_stripe_info evms; |
| dev_t devno = blkid_probe_get_devno(pr); |
| |
| if (!devno) |
| goto nothing; /* probably not a block device */ |
| |
| if (!is_evms_device(devno)) |
| goto nothing; |
| |
| memset(&evms, 0, sizeof(evms)); |
| |
| if (ioctl(pr->fd, EVMS_GET_STRIPE_INFO, &evms)) |
| goto nothing; |
| |
| blkid_topology_set_minimum_io_size(pr, evms.size << 9); |
| blkid_topology_set_optimal_io_size(pr, (evms.size * evms.width) << 9); |
| |
| return 0; |
| |
| nothing: |
| return 1; |
| } |
| |
| const struct blkid_idinfo evms_tp_idinfo = |
| { |
| .name = "evms", |
| .probefunc = probe_evms_tp, |
| .magics = BLKID_NONE_MAGIC |
| }; |
| |