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by Thomas Goirand
Import upstream version 2.0.90 |
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/*
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*
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* Copyright (C) 2011 Citrix Systems Inc.
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*
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* This file is part of Blktap2.
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*
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* Blktap2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* Blktap2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License version 2 for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with Blktap2. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef _LINUX_BLKTAP_H
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#define _LINUX_BLKTAP_H
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/*
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* Control
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*/
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#define BLKTAP_IOCTL_RESPOND 1
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#define BLKTAP_IOCTL_ALLOC_TAP 200
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#define BLKTAP_IOCTL_FREE_TAP 201
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#define BLKTAP_IOCTL_CREATE_DEVICE 208
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#define BLKTAP_IOCTL_REMOVE_DEVICE 207
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#define BLKTAP_DEVICE_FLAG_RO 0x00000001UL /* disk is R/O */ |
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#define BLKTAP_DEVICE_FLAG_PSZ 0x00000002UL /* physical sector size */ |
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#define BLKTAP_DEVICE_FLAG_FLUSH 0x00000004UL /* supports FLUSH */ |
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#define BLKTAP_DEVICE_FLAG_TRIM 0x00000008UL /* supports TRIM */ |
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#define BLKTAP_DEVICE_FLAG_TRIM_RZ 0x00000010UL /* trimmed data reads zero */ |
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struct blktap_info { |
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unsigned int ring_major; |
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unsigned int bdev_major; |
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unsigned int ring_minor; |
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};
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struct blktap_device_info { |
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unsigned long long capacity; |
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unsigned int sector_size; |
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unsigned long flags; |
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unsigned int phys_block_size; |
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unsigned int phys_block_offset; |
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unsigned int trim_block_size; |
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unsigned int trim_block_offset; |
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};
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/*
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* I/O ring
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*/
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#ifdef __KERNEL__
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#define BLKTAP_PAGE_SIZE PAGE_SIZE
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#endif
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#include <xen/interface/io/ring.h> |
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struct blktap_segment { |
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uint32_t __pad; |
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uint8_t first_sect; |
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uint8_t last_sect; |
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};
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#define BLKTAP_OP_READ 0
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#define BLKTAP_OP_WRITE 1
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#define BLKTAP_OP_FLUSH 2
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#define BLKTAP_OP_TRIM 3
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#define BLKTAP_SEGMENT_MAX 11
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struct blktap_ring_rw_request { |
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uint64_t sector_number; |
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struct blktap_segment seg[BLKTAP_SEGMENT_MAX]; |
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};
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struct blktap_ring_tr_request { |
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uint64_t sector_number; |
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uint64_t nr_sectors; |
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};
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struct blktap_ring_request { |
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uint8_t operation; |
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uint8_t nr_segments; |
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uint16_t __pad; |
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uint64_t id; |
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union { |
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struct blktap_ring_rw_request rw; |
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struct blktap_ring_tr_request tr; |
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} u; |
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};
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#define BLKTAP_RSP_EOPNOTSUPP -2
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#define BLKTAP_RSP_ERROR -1
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#define BLKTAP_RSP_OKAY 0
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struct blktap_ring_response { |
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uint64_t id; |
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uint8_t operation; |
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int16_t status; |
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};
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DEFINE_RING_TYPES(blktap, |
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struct blktap_ring_request, |
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struct blktap_ring_response); |
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#define BLKTAP_RING_SIZE \
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((int)__RD32((BLKTAP_PAGE_SIZE - \
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(size_t)&((struct blktap_sring*)0)->ring) / \
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sizeof(((struct blktap_sring *)0)->ring[0])))
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/*
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* Ring messages + old ioctls (DEPRECATED)
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*/
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#define BLKTAP_RING_MESSAGE(_sring) \
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((uint8_t*)(&(_sring)->rsp_event + 1))
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#define BLKTAP_RING_MESSAGE_CLOSE 3
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#define BLKTAP_IOCTL_CREATE_DEVICE_COMPAT 202
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#define BLKTAP_NAME_MAX 256
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struct blktap2_params { |
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char name[BLKTAP_NAME_MAX]; |
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unsigned long long capacity; |
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unsigned long sector_size; |
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};
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#endif /* _LINUX_BLKTAP_H */ |