This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / drivers / xen / blktap / common.h

diff --git a/drivers/xen/blktap/common.h b/drivers/xen/blktap/common.h
new file mode 100644 (file)
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--- /dev/null
+++ b/drivers/xen/blktap/common.h
@@ -0,0 +1,120 @@
+/* 
+ * 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/config.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 <asm/io.h>
+#include <asm/setup.h>
+#include <asm/pgalloc.h>
+#include <xen/evtchn.h>
+#include <asm/hypervisor.h>
+#include <xen/interface/io/blkif.h>
+#include <xen/interface/io/ring.h>
+#include <xen/gnttab.h>
+#include <xen/driver_util.h>
+
+#define DPRINTK(_f, _a...) pr_debug("(file=%s, line=%d) " _f, \
+                                    __FILE__ , __LINE__ , ## _a )
+
+#define WPRINTK(fmt, args...) printk(KERN_WARNING "blk_tap: " fmt, ##args)
+
+struct backend_info; 
+
+typedef struct blkif_st {
+       /* Unique identifier for this interface. */
+       domid_t           domid;
+       unsigned int      handle;
+       /* Physical parameters of the comms window. */
+       unsigned int      evtchn;
+       unsigned int      irq;
+       /* Comms information. */
+       blkif_back_ring_t blk_ring;
+       struct vm_struct *blk_ring_area;
+       /* 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;
+       struct task_struct  *xenblkd;
+       unsigned int        waiting_reqs;
+       request_queue_t     *plug;
+
+       /* statistics */
+       unsigned long       st_print;
+       int                 st_rd_req;
+       int                 st_wr_req;
+       int                 st_oo_req;
+
+       wait_queue_head_t waiting_to_free;
+
+       grant_handle_t shmem_handle;
+       grant_ref_t    shmem_ref;
+       
+       int             dev_num;
+       uint64_t        sectors;
+} blkif_t;
+
+blkif_t *tap_alloc_blkif(domid_t domid);
+void tap_blkif_free(blkif_t *blkif);
+int tap_blkif_map(blkif_t *blkif, unsigned long shared_page, 
+                 unsigned int evtchn);
+
+#define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
+#define 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;
+};
+
+void tap_blkif_interface_init(void);
+
+void tap_blkif_xenbus_init(void);
+
+irqreturn_t tap_blkif_be_int(int irq, void *dev_id, struct pt_regs *regs);
+int tap_blkif_schedule(void *arg);
+
+int dom_to_devid(domid_t domid, int xenbus_id, blkif_t *blkif);
+void signal_tapdisk(int idx);
+
+#endif /* __BLKIF__BACKEND__COMMON_H__ */