78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
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* Evms topology
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* -- this is fallback for old systems where the toplogy information is not
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* exported by sysfs
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*
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* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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*
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*/
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#include <errno.h>
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#include <fcntl.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/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "topology.h"
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#define EVMS_MAJOR 117
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#ifndef _IOT__IOTBASE_u_int32_t
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#define _IOT__IOTBASE_u_int32_t IOT_SIMPLE(uint32_t)
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#endif
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#define _IOT_evms_stripe_info _IOT (_IOTS(uint32_t), 2, 0, 0, 0, 0)
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#define EVMS_GET_STRIPE_INFO _IOR(EVMS_MAJOR, 0xF0, struct evms_stripe_info)
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struct evms_stripe_info {
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uint32_t size; /* stripe unit 512-byte blocks */
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uint32_t width; /* the number of stripe members or RAID data disks */
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} evms_stripe_info;
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static int is_evms_device(dev_t devno)
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{
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if (major(devno) == EVMS_MAJOR)
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return 1;
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return blkid_driver_has_major("evms", major(devno));
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}
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static int probe_evms_tp(blkid_probe pr,
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const struct blkid_idmag *mag __attribute__((__unused__)))
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{
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struct evms_stripe_info evms;
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dev_t devno = blkid_probe_get_devno(pr);
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if (!devno)
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goto nothing; /* probably not a block device */
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if (!is_evms_device(devno))
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goto nothing;
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memset(&evms, 0, sizeof(evms));
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if (ioctl(pr->fd, EVMS_GET_STRIPE_INFO, &evms))
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goto nothing;
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blkid_topology_set_minimum_io_size(pr, evms.size << 9);
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blkid_topology_set_optimal_io_size(pr, (evms.size * evms.width) << 9);
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return 0;
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nothing:
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return 1;
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}
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const struct blkid_idinfo evms_tp_idinfo =
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{
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.name = "evms",
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.probefunc = probe_evms_tp,
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.magics = BLKID_NONE_MAGIC
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};
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