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

[linux-2.6.git] / drivers / message / i2o / i2o_block.h

diff --git a/drivers/message/i2o/i2o_block.h b/drivers/message/i2o/i2o_block.h
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+/*
+ *     Block OSM structures/API
+ *
+ *     Copyright (C) 1999-2002 Red Hat Software
+ *
+ *     Written by Alan Cox, Building Number Three Ltd
+ *
+ *     This program is free software; you can redistribute it and/or modify it
+ *     under the terms of the GNU General Public License as published by the
+ *     Free Software Foundation; either version 2 of the License, or (at your
+ *     option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful, but
+ *     WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *     General Public License for more details.
+ *
+ *     For the purpose of avoiding doubt the preferred form of the work
+ *     for making modifications shall be a standards compliant form such
+ *     gzipped tar and not one requiring a proprietary or patent encumbered
+ *     tool to unpack.
+ *
+ *     Fixes/additions:
+ *             Steve Ralston:
+ *                     Multiple device handling error fixes,
+ *                     Added a queue depth.
+ *             Alan Cox:
+ *                     FC920 has an rmw bug. Dont or in the end marker.
+ *                     Removed queue walk, fixed for 64bitness.
+ *                     Rewrote much of the code over time
+ *                     Added indirect block lists
+ *                     Handle 64K limits on many controllers
+ *                     Don't use indirects on the Promise (breaks)
+ *                     Heavily chop down the queue depths
+ *             Deepak Saxena:
+ *                     Independent queues per IOP
+ *                     Support for dynamic device creation/deletion
+ *                     Code cleanup
+ *                     Support for larger I/Os through merge* functions
+ *                     (taken from DAC960 driver)
+ *             Boji T Kannanthanam:
+ *                     Set the I2O Block devices to be detected in increasing
+ *                     order of TIDs during boot.
+ *                     Search and set the I2O block device that we boot off
+ *                     from as the first device to be claimed (as /dev/i2o/hda)
+ *                     Properly attach/detach I2O gendisk structure from the
+ *                     system gendisk list. The I2O block devices now appear in
+ *                     /proc/partitions.
+ *             Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *                     Minor bugfixes for 2.6.
+ */
+
+#ifndef I2O_BLOCK_OSM_H
+#define I2O_BLOCK_OSM_H
+
+#define I2O_BLOCK_RETRY_TIME HZ/4
+#define I2O_BLOCK_MAX_OPEN_REQUESTS 50
+
+/* I2O Block OSM mempool struct */
+struct i2o_block_mempool {
+       kmem_cache_t    *slab;
+       mempool_t       *pool;
+};
+
+/* I2O Block device descriptor */
+struct i2o_block_device {
+       struct i2o_device *i2o_dev;     /* pointer to I2O device */
+       struct gendisk *gd;
+       spinlock_t lock;                /* queue lock */
+       struct list_head open_queue;    /* list of transfered, but unfinished
+                                          requests */
+       unsigned int open_queue_depth;  /* number of requests in the queue */
+
+       int rcache;                     /* read cache flags */
+       int wcache;                     /* write cache flags */
+       int flags;
+       int power;                      /* power state */
+       int media_change_flag;          /* media changed flag */
+};
+
+/* I2O Block device request */
+struct i2o_block_request
+{
+       struct list_head queue;
+       struct request *req;            /* corresponding request */
+       struct i2o_block_device *i2o_blk_dev;   /* I2O block device */
+       int sg_dma_direction;           /* direction of DMA buffer read/write */
+       int sg_nents;                   /* number of SG elements */
+       struct scatterlist sg_table[I2O_MAX_SEGMENTS]; /* SG table */
+};
+
+/* I2O Block device delayed request */
+struct i2o_block_delayed_request
+{
+       struct work_struct work;
+       struct request_queue *queue;
+};
+
+#endif