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