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58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the GPL.
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*/
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#ifndef _DM_IOCTL_H
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#define _DM_IOCTL_H
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#include "device-mapper.h"
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/*
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* Implements a traditional ioctl interface to the
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* device mapper. Yuck.
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*/
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struct dm_target_spec {
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int32_t status; /* used when reading from kernel only */
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unsigned long long sector_start;
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unsigned long long length;
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char target_type[DM_MAX_TYPE_NAME];
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unsigned long next; /* offset in bytes to next target_spec */
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/*
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* Parameter string starts immediately
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* after this object. Be careful to add
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* padding after string to ensure correct
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* alignment of subsequent dm_target_spec.
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*/
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};
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struct dm_ioctl {
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unsigned long data_size; /* the size of this structure */
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char name[DM_NAME_LEN];
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int exists; /* out */
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int suspend; /* in/out */
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int open_count; /* out */
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int major; /* out */
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int minor; /* in/out */
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int target_count; /* in/out */
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};
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/* FIXME: find own numbers, 109 is pinched from LVM */
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#define DM_IOCTL 0xfd
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#define DM_CHAR_MAJOR 124
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#define DM_CREATE _IOWR(DM_IOCTL, 0x00, struct dm_ioctl)
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#define DM_REMOVE _IOW(DM_IOCTL, 0x01, struct dm_ioctl)
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#define DM_SUSPEND _IOW(DM_IOCTL, 0x02, struct dm_ioctl)
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#define DM_RELOAD _IOWR(DM_IOCTL, 0x03, struct dm_ioctl)
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#define DM_INFO _IOWR(DM_IOCTL, 0x04, struct dm_ioctl)
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#endif
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