source: trunk/kernel/kern/blkio.h @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/*
2 * kern/blkio.c - Per-page buffers I/O interface
3 *
4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef BLKIO_H_
24#define BLKIO_H_
25
26#include <list.h>
27
28#define BLKIO_RD        0x01
29#define BLKIO_SYNC      0x02
30
31#define BLKIO_INIT      0x01
32
33#include <page.h>
34#include <device.h>
35#include <list.h>
36
37/******************************************************************************************
38 *****************************************************************************************/
39typedef struct blkio_s
40{
41        uint32_t            b_flags;        // BLKIO_INIT
42
43        struct
44        {
45                spinlock_t                  lock;               
46                uint16_t            count;     
47                uint16_t            cntr;               
48                error_t             error;     
49                struct wait_queue_s wait;
50
51        }                     b_ctrl;         // Only used in head-blkio
52
53        dev_request_t       b_dev_rq;   // request for the block device
54        page_t         *    b_page;             // buffer page descriptor
55        device_t       *    b_dev;              // block device
56        slist_entry_t       b_list;         // next buffer in this page
57        void           *        b_private;      // data for the I/O completion method
58}
59blkio_t;
60
61/**
62 * Macro to set a blkio to be skiped while first sync 
63 *
64 * @b          pointer to blkio
65 */
66#define blkio_set_initial(b)                    \
67        do{(b)->b_flags |= BLKIO_INIT;}while(0)
68
69KMEM_OBJATTR_INIT(blkio_kmem_init);
70
71/******************************************************************************************
72 * Initializes the blkio structure.
73 ******************************************************************************************
74 * @ dev    : pointer on block device.
75 * @ page   : buffer page to get blkio structures initialized
76 * @ count  : number of blocks in the page
77 * @ return     error code, 0 if OK
78 *****************************************************************************************/
79error_t blkio_init( device_t * dev,
80                    page_t   * page,
81                    uint32_t   count );
82
83/**
84 * Synchronizes all the buffers in a buffer page.
85 *
86 * @page        buffer page to be synced with the disk
87 * @flags       blkio flags
88 * @return      error code, 0 if OK
89 */
90error_t blkio_sync(struct page_s *page, uint_t flags);
91
92/**
93 * Destroys the blkio structures for a buffer page.
94 *
95 * @page        buffer page to have its blkio structures destroyed
96 * @return      error code, 0 if OK
97 */
98error_t blkio_destroy(struct page_s *page);
99
100#endif /* BLKIO_H_ */
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