8b6bf747d7
And also shorten the name if it has blkback to blkbk. This results in the symbol table (if compiled in the kernel) to be much shorter, prettier, and also easier to search for. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
129 lines
4.0 KiB
C
129 lines
4.0 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(_f, _a...) \
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pr_debug("(file=%s, line=%d) " _f, \
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__FILE__ , __LINE__ , ## _a)
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struct vbd {
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blkif_vdev_t handle; /* what the domain refers to this vbd as */
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unsigned char readonly; /* Non-zero -> read-only */
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unsigned char type; /* VDISK_xxx */
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u32 pdevice; /* phys device that this vbd maps to */
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struct block_device *bdev;
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sector_t size; /* Cached size parameter */
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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_br_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_barrier(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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