ia64/linux-2.6.18-xen.hg

view drivers/xen/blkfront/block.h @ 805:63be3e5e2f1a

linux/blkfront: use blk_rq_map_sg to generate ring entries

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Mar 05 14:42:00 2009 +0000 (2009-03-05)
parents 1d647ef26f3f
children
line source
1 /******************************************************************************
2 * block.h
3 *
4 * Shared definitions between all levels of XenLinux Virtual block devices.
5 *
6 * Copyright (c) 2003-2004, Keir Fraser & Steve Hand
7 * Modifications by Mark A. Williamson are (c) Intel Research Cambridge
8 * Copyright (c) 2004-2005, Christian Limpach
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation; or, when distributed
13 * separately from the Linux kernel or incorporated into other
14 * software packages, subject to the following license:
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a copy
17 * of this source file (the "Software"), to deal in the Software without
18 * restriction, including without limitation the rights to use, copy, modify,
19 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
20 * and to permit persons to whom the Software is furnished to do so, subject to
21 * the following conditions:
22 *
23 * The above copyright notice and this permission notice shall be included in
24 * all copies or substantial portions of the Software.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
29 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
30 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
31 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
32 * IN THE SOFTWARE.
33 */
35 #ifndef __XEN_DRIVERS_BLOCK_H__
36 #define __XEN_DRIVERS_BLOCK_H__
38 #include <linux/version.h>
39 #include <linux/module.h>
40 #include <linux/kernel.h>
41 #include <linux/sched.h>
42 #include <linux/slab.h>
43 #include <linux/string.h>
44 #include <linux/errno.h>
45 #include <linux/fs.h>
46 #include <linux/hdreg.h>
47 #include <linux/blkdev.h>
48 #include <linux/major.h>
49 #include <asm/hypervisor.h>
50 #include <xen/xenbus.h>
51 #include <xen/gnttab.h>
52 #include <xen/interface/xen.h>
53 #include <xen/interface/io/blkif.h>
54 #include <xen/interface/io/ring.h>
55 #include <asm/io.h>
56 #include <asm/atomic.h>
57 #include <asm/uaccess.h>
59 #define DPRINTK(_f, _a...) pr_debug(_f, ## _a)
61 #if 0
62 #define DPRINTK_IOCTL(_f, _a...) printk(KERN_ALERT _f, ## _a)
63 #else
64 #define DPRINTK_IOCTL(_f, _a...) ((void)0)
65 #endif
67 struct xlbd_type_info
68 {
69 int partn_shift;
70 int disks_per_major;
71 char *devname;
72 char *diskname;
73 };
75 struct xlbd_major_info
76 {
77 int major;
78 int index;
79 int usage;
80 struct xlbd_type_info *type;
81 };
83 struct blk_shadow {
84 blkif_request_t req;
85 unsigned long request;
86 unsigned long frame[BLKIF_MAX_SEGMENTS_PER_REQUEST];
87 };
89 #define BLK_RING_SIZE __RING_SIZE((blkif_sring_t *)0, PAGE_SIZE)
91 /*
92 * We have one of these per vbd, whether ide, scsi or 'other'. They
93 * hang in private_data off the gendisk structure. We may end up
94 * putting all kinds of interesting stuff here :-)
95 */
96 struct blkfront_info
97 {
98 struct xenbus_device *xbdev;
99 dev_t dev;
100 struct gendisk *gd;
101 int vdevice;
102 blkif_vdev_t handle;
103 int connected;
104 int ring_ref;
105 blkif_front_ring_t ring;
106 struct scatterlist sg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
107 unsigned int irq;
108 struct xlbd_major_info *mi;
109 request_queue_t *rq;
110 struct work_struct work;
111 struct gnttab_free_callback callback;
112 struct blk_shadow shadow[BLK_RING_SIZE];
113 unsigned long shadow_free;
114 int feature_barrier;
115 int is_ready;
117 /**
118 * The number of people holding this device open. We won't allow a
119 * hot-unplug unless this is 0.
120 */
121 int users;
122 };
124 extern spinlock_t blkif_io_lock;
126 extern int blkif_open(struct inode *inode, struct file *filep);
127 extern int blkif_release(struct inode *inode, struct file *filep);
128 extern int blkif_ioctl(struct inode *inode, struct file *filep,
129 unsigned command, unsigned long argument);
130 extern int blkif_getgeo(struct block_device *, struct hd_geometry *);
131 extern int blkif_check(dev_t dev);
132 extern int blkif_revalidate(dev_t dev);
133 extern void do_blkif_request (request_queue_t *rq);
135 /* Virtual block-device subsystem. */
136 /* Note that xlvbd_add doesn't call add_disk for you: you're expected
137 to call add_disk on info->gd once the disk is properly connected
138 up. */
139 int xlvbd_add(blkif_sector_t capacity, int device,
140 u16 vdisk_info, u16 sector_size, struct blkfront_info *info);
141 void xlvbd_del(struct blkfront_info *info);
142 int xlvbd_barrier(struct blkfront_info *info);
144 #ifdef CONFIG_SYSFS
145 int xlvbd_sysfs_addif(struct blkfront_info *info);
146 void xlvbd_sysfs_delif(struct blkfront_info *info);
147 #else
148 static inline int xlvbd_sysfs_addif(struct blkfront_info *info)
149 {
150 return 0;
151 }
153 static inline void xlvbd_sysfs_delif(struct blkfront_info *info)
154 {
155 ;
156 }
157 #endif
159 #endif /* __XEN_DRIVERS_BLOCK_H__ */