source: trunk/kernel/fs/fatfs/fatfs.c @ 1

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

First import

File size: 4.3 KB
Line 
1/*
2 * fatfs.c - FATFS file system API implementation.
3 *
4 * Author    Mohamed Lamine Karaoui (2015)
5 *           Alain Greiner (2016)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25
26#include <hal_types.h>
27#include <hal_special.h>
28#include <printk.h>
29#include <kmem.h>
30#include <vfs.h>
31#include <fatfs.h>
32
33
34///////////////////////////////////////////////////////////////////////////////////////
35// FATFS specific functions : these static functions cannot be directly
36//                            called by the VFS
37///////////////////////////////////////////////////////////////////////////////////////
38
39
40
41
42///////////////////////////////////////////////////////////////////////////////////////
43// Generic API : the following functions are called by the VFS,
44//               and must be defined by all supported file systems.
45///////////////////////////////////////////////////////////////////////////////////////
46
47////////////////////////////////////////////////////////////
48error_t fatfs_inode_create( struct vfs_inode_s * vfs_inode )
49{
50    printk("\n[PANIC] %s not fully implemented yet\n", __FUNCTION__ );
51    hal_core_sleep();
52
53    kmem_req_t      req;
54    error_t         error;
55    fatfs_inode_t * fatfs_inode;
56    uint32_t        cluster;        // allocated cluster index
57
58    // allocate memory for fatfs inode
59        req.type    = KMEM_FATFS_INODE;
60        req.size    = sizeof(fatfs_inode_t);
61    req.flags   = AF_KERNEL | AF_ZERO;
62        fatfs_inode = (fatfs_inode_t *)kmem_alloc( &req );
63
64    if( fatfs_inode == NULL ) return ENOMEM;
65
66    // initialise ramfs_inode
67    fatfs_inode->first_cluster = 0;   // TODO ???
68    fatfs_inode->ctx           = (fatfs_ctx_t *)vfs_inode->ctx->extend;
69 
70    // link vfs_inode to ramfs_inode
71    inode->extend    = ramfs_inode;
72    ramfs->vfs_inode = vfs_inode;
73
74    return 0;
75
76}
77
78//////////////////////////////////////////////////////
79void fatfs_inode_destroy( struct vfs_inode_s * inode )
80{
81    printk("\n[PANIC] %s not fully implemented yet\n", __FUNCTION__ );
82    hal_core_sleep();
83}
84
85////////////////////////////////////////////////
86error_t fatfs_write_page( struct page_s * page )
87{
88    printk("\n[PANIC] %s not fully implemented yet\n", __FUNCTION__ );
89    hal_core_sleep();
90
91    // get pointer on mapper and page index from page descriptor
92    mapper_t * mapper = page->mapper;
93    uint32_t   index  = page->index;
94
95    if( mapper == NULL)
96    {
97        printk("\n[PANIC] in %s : no mapper for this page\n", __FUNCTION__ );
98        hal_core_sleep();
99    }
100
101    // get VFS inode pointer from mapper
102    vfs_inode_t * vfs_inode = mapper->inode;
103
104    // get FATFS inode pointer for VFS inode
105    fatfs_inode_t * fatfs_inode = (fatfs_inode_t)vfs_inode->extend;
106
107    // get FATFS context and first cluster from FATFS inode
108    fatfs_ctx_t * fatfs_ctx     = fatfs_inode->ctx;
109    uint32_t      first_cluster = fatfs_inode->first_cluster;
110
111
112}
113
114///////////////////////////////////////////////
115error_t fatfs_read_page( struct page_s * page )
116{
117    printk("\n[PANIC] %s not fully implemented yet\n", __FUNCTION__ );
118    hal_core_sleep();
119
120    // get pointer on mapper and page index from page descriptor
121    mapper_t * mapper = page->mapper;
122    uint32_t   index  = page->index;
123
124    if( mapper == NULL)
125    {
126        printk("\n[PANIC] in %s : no mapper for this page\n", __FUNCTION__ );
127        hal_core_sleep();
128    }
129
130    // get VFS inode pointer from mapper
131    vfs_inode_t * vfs_inode = mapper->inode;
132
133    // get FATFS inode pointer for VFS inode
134    fatfs_inode_t * fatfs_inode = (fatfs_inode_t)vfs_inode->extend;
135
136    // get FATFS context and first cluster from FATFS inode
137    fatfs_ctx_t * fatfs_ctx     = fatfs_inode->ctx;
138    uint32_t      first_cluster = fatfs_inode->first_cluster;
139
140
141}
142
Note: See TracBrowser for help on using the repository browser.