1 /******************************************************************************
4 * Shared definitions between all levels of XenLinux Virtual block devices.
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
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:
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:
23 * The above copyright notice and this permission notice shall be included in
24 * all copies or substantial portions of the Software.
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
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/atomic.h>
45 #include <linux/errno.h>
47 #include <linux/hdreg.h>
48 #include <linux/blkdev.h>
49 #include <linux/major.h>
50 #include <linux/mutex.h>
51 #include <asm/hypervisor.h>
52 #include <xen/xenbus.h>
53 #include <xen/gnttab.h>
54 #include <xen/interface/xen.h>
55 #include <xen/interface/io/blkif.h>
56 #include <xen/interface/io/ring.h>
58 #include <asm/uaccess.h>
60 #define DPRINTK(_f, _a...) pr_debug(_f, ## _a)
63 #define DPRINTK_IOCTL(_f, _a...) pr_alert(_f, ## _a)
65 #define DPRINTK_IOCTL(_f, _a...) ((void)0)
68 struct xlbd_major_info
73 const struct xlbd_type_info *type;
74 struct xlbd_minor_state *minors;
79 struct request *request;
80 unsigned long frame[BLKIF_MAX_SEGMENTS_PER_REQUEST];
83 #define BLK_RING_SIZE __CONST_RING_SIZE(blkif, PAGE_SIZE)
86 * We have one of these per vbd, whether ide, scsi or 'other'. They
87 * hang in private_data off the gendisk structure. We may end up
88 * putting all kinds of interesting stuff here :-)
92 struct xenbus_device *xbdev;
99 blkif_front_ring_t ring;
101 struct scatterlist sg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
103 struct xlbd_major_info *mi;
104 struct request_queue *rq;
105 struct work_struct work;
106 struct gnttab_free_callback callback;
107 struct blk_shadow shadow[BLK_RING_SIZE];
108 unsigned long shadow_free;
109 unsigned int feature_flush;
110 unsigned int flush_op;
111 bool feature_discard;
112 bool feature_secdiscard;
113 unsigned int discard_granularity;
114 unsigned int discard_alignment;
118 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
119 extern int blkif_open(struct inode *inode, struct file *filep);
120 extern int blkif_release(struct inode *inode, struct file *filep);
121 extern int blkif_ioctl(struct inode *inode, struct file *filep,
122 unsigned command, unsigned long argument);
124 extern int blkif_open(struct block_device *bdev, fmode_t mode);
125 extern int blkif_release(struct gendisk *disk, fmode_t mode);
126 extern int blkif_ioctl(struct block_device *bdev, fmode_t mode,
127 unsigned command, unsigned long argument);
129 extern int blkif_getgeo(struct block_device *, struct hd_geometry *);
130 extern int blkif_check(dev_t dev);
131 extern int blkif_revalidate(dev_t dev);
132 extern void do_blkif_request (struct request_queue *rq);
134 /* Virtual block-device subsystem. */
135 /* Note that xlvbd_add doesn't call add_disk for you: you're expected
136 to call add_disk on info->gd once the disk is properly connected
138 int xlvbd_add(blkif_sector_t capacity, int device,
139 u16 vdisk_info, u16 sector_size, struct blkfront_info *info);
140 void xlvbd_del(struct blkfront_info *info);
141 void xlvbd_flush(struct blkfront_info *info);
144 int xlvbd_sysfs_addif(struct blkfront_info *info);
145 void xlvbd_sysfs_delif(struct blkfront_info *info);
147 static inline int xlvbd_sysfs_addif(struct blkfront_info *info)
152 static inline void xlvbd_sysfs_delif(struct blkfront_info *info)
158 void xlbd_release_major_info(void);
160 /* Virtual cdrom block-device */
162 extern void register_vcd(struct blkfront_info *info);
163 extern void unregister_vcd(struct blkfront_info *info);
165 static inline void register_vcd(struct blkfront_info *info) {}
166 static inline void unregister_vcd(struct blkfront_info *info) {}
169 #endif /* __XEN_DRIVERS_BLOCK_H__ */