direct-io.hg

view linux-2.6-xen-sparse/drivers/xen/blkback/common.h @ 12496:0c0ef61de06b

[BLK] Handle block devices with more than 2^32 sectors.
Signed-off-by: Keir Fraser <keir@xensource.com>
author kfraser@localhost.localdomain
date Tue Nov 21 10:16:58 2006 +0000 (2006-11-21)
parents 4eaadb2ae198
children d275951acf10
line source
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License version 2
4 * as published by the Free Software Foundation; or, when distributed
5 * separately from the Linux kernel or incorporated into other
6 * software packages, subject to the following license:
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this source file (the "Software"), to deal in the Software without
10 * restriction, including without limitation the rights to use, copy, modify,
11 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
12 * and to permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * IN THE SOFTWARE.
25 */
27 #ifndef __BLKIF__BACKEND__COMMON_H__
28 #define __BLKIF__BACKEND__COMMON_H__
30 #include <linux/config.h>
31 #include <linux/version.h>
32 #include <linux/module.h>
33 #include <linux/interrupt.h>
34 #include <linux/slab.h>
35 #include <linux/blkdev.h>
36 #include <linux/vmalloc.h>
37 #include <linux/wait.h>
38 #include <asm/io.h>
39 #include <asm/setup.h>
40 #include <asm/pgalloc.h>
41 #include <xen/evtchn.h>
42 #include <asm/hypervisor.h>
43 #include <xen/interface/io/blkif.h>
44 #include <xen/interface/io/ring.h>
45 #include <xen/gnttab.h>
46 #include <xen/driver_util.h>
47 #include <xen/xenbus.h>
49 #define DPRINTK(_f, _a...) \
50 pr_debug("(file=%s, line=%d) " _f, \
51 __FILE__ , __LINE__ , ## _a )
53 struct vbd {
54 blkif_vdev_t handle; /* what the domain refers to this vbd as */
55 unsigned char readonly; /* Non-zero -> read-only */
56 unsigned char type; /* VDISK_xxx */
57 u32 pdevice; /* phys device that this vbd maps to */
58 struct block_device *bdev;
59 };
61 struct backend_info;
63 typedef struct blkif_st {
64 /* Unique identifier for this interface. */
65 domid_t domid;
66 unsigned int handle;
67 /* Physical parameters of the comms window. */
68 unsigned int evtchn;
69 unsigned int irq;
70 /* Comms information. */
71 blkif_back_ring_t blk_ring;
72 struct vm_struct *blk_ring_area;
73 /* The VBD attached to this interface. */
74 struct vbd vbd;
75 /* Back pointer to the backend_info. */
76 struct backend_info *be;
77 /* Private fields. */
78 spinlock_t blk_ring_lock;
79 atomic_t refcnt;
81 wait_queue_head_t wq;
82 struct task_struct *xenblkd;
83 unsigned int waiting_reqs;
84 request_queue_t *plug;
86 /* statistics */
87 unsigned long st_print;
88 int st_rd_req;
89 int st_wr_req;
90 int st_oo_req;
91 int st_br_req;
93 wait_queue_head_t waiting_to_free;
95 grant_handle_t shmem_handle;
96 grant_ref_t shmem_ref;
97 } blkif_t;
99 blkif_t *blkif_alloc(domid_t domid);
100 void blkif_disconnect(blkif_t *blkif);
101 void blkif_free(blkif_t *blkif);
102 int blkif_map(blkif_t *blkif, unsigned long shared_page, unsigned int evtchn);
104 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
105 #define blkif_put(_b) \
106 do { \
107 if (atomic_dec_and_test(&(_b)->refcnt)) \
108 wake_up(&(_b)->waiting_to_free);\
109 } while (0)
111 /* Create a vbd. */
112 int vbd_create(blkif_t *blkif, blkif_vdev_t vdevice, unsigned major,
113 unsigned minor, int readonly);
114 void vbd_free(struct vbd *vbd);
116 unsigned long long vbd_size(struct vbd *vbd);
117 unsigned int vbd_info(struct vbd *vbd);
118 unsigned long vbd_secsize(struct vbd *vbd);
120 struct phys_req {
121 unsigned short dev;
122 unsigned short nr_sects;
123 struct block_device *bdev;
124 blkif_sector_t sector_number;
125 };
127 int vbd_translate(struct phys_req *req, blkif_t *blkif, int operation);
129 void blkif_interface_init(void);
131 void blkif_xenbus_init(void);
133 irqreturn_t blkif_be_int(int irq, void *dev_id, struct pt_regs *regs);
134 int blkif_schedule(void *arg);
136 int blkback_barrier(struct xenbus_transaction xbt,
137 struct backend_info *be, int state);
139 #endif /* __BLKIF__BACKEND__COMMON_H__ */