blob: cf8873cbca3f23bedfbda5797734edef23eba96e (
plain) (
tree)
|
|
/*
* 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
/* request queue sizes */
#define I2O_BLOCK_REQ_MEMPOOL_SIZE 32
#define KERNEL_SECTOR_SHIFT 9
#define KERNEL_SECTOR_SIZE (1 << KERNEL_SECTOR_SHIFT)
/* I2O Block OSM mempool struct */
struct i2o_block_mempool {
struct kmem_cache *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 transferred, 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;
u16 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 */
struct device *dev; /* device used for DMA */
int sg_nents; /* number of SG elements */
struct scatterlist sg_table[I2O_MAX_PHYS_SEGMENTS]; /* SG table */
};
/* I2O Block device delayed request */
struct i2o_block_delayed_request {
struct delayed_work work;
struct request_queue *queue;
};
#endif
|
