135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __BLKIF__BACKEND__COMMON_H__
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#define __BLKIF__BACKEND__COMMON_H__
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <linux/io.h>
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#include <asm/setup.h>
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#include <asm/pgalloc.h>
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#include <asm/hypervisor.h>
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#include <xen/blkif.h>
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#include <xen/grant_table.h>
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#include <xen/xenbus.h>
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#define DPRINTK(fmt, args...) \
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pr_debug("xen-blkback: (%s:%d) " fmt ".\n", \
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__func__, __LINE__, ##args)
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struct vbd {
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/* What the domain refers to this vbd as. */
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blkif_vdev_t handle;
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/* Non-zero -> read-only */
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unsigned char readonly;
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/* VDISK_xxx */
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unsigned char type;
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/* phys device that this vbd maps to. */
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u32 pdevice;
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struct block_device *bdev;
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/* Cached size parameter. */
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sector_t size;
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bool flush_support;
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};
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struct backend_info;
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struct blkif_st {
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/* Unique identifier for this interface. */
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domid_t domid;
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unsigned int handle;
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/* Physical parameters of the comms window. */
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unsigned int irq;
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/* Comms information. */
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enum blkif_protocol blk_protocol;
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union blkif_back_rings blk_rings;
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struct vm_struct *blk_ring_area;
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/* The VBD attached to this interface. */
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struct vbd vbd;
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/* Back pointer to the backend_info. */
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struct backend_info *be;
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/* Private fields. */
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spinlock_t blk_ring_lock;
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atomic_t refcnt;
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wait_queue_head_t wq;
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/* One thread per one blkif. */
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struct task_struct *xenblkd;
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unsigned int waiting_reqs;
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/* statistics */
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unsigned long st_print;
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int st_rd_req;
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int st_wr_req;
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int st_oo_req;
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int st_f_req;
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int st_rd_sect;
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int st_wr_sect;
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wait_queue_head_t waiting_to_free;
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grant_handle_t shmem_handle;
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grant_ref_t shmem_ref;
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};
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#define vbd_sz(_v) ((_v)->bdev->bd_part ? \
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(_v)->bdev->bd_part->nr_sects : \
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get_capacity((_v)->bdev->bd_disk))
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#define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt))
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#define xen_blkif_put(_b) \
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do { \
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if (atomic_dec_and_test(&(_b)->refcnt)) \
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wake_up(&(_b)->waiting_to_free);\
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} while (0)
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struct phys_req {
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unsigned short dev;
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unsigned short nr_sects;
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struct block_device *bdev;
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blkif_sector_t sector_number;
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};
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int xen_blkif_interface_init(void);
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int xen_blkif_xenbus_init(void);
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irqreturn_t xen_blkif_be_int(int irq, void *dev_id);
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int xen_blkif_schedule(void *arg);
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int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
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struct backend_info *be, int state);
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struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
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#endif /* __BLKIF__BACKEND__COMMON_H__ */
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