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体验新版 GitCode,发现更多精彩内容 >>
提交
0e16b6dc
编写于
5月 05, 2013
作者:
B
Bernard Xiong
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
add RAMFS implementation
上级
e58d6564
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
455 addition
and
0 deletion
+455
-0
components/dfs/filesystems/ramfs/SConscript
components/dfs/filesystems/ramfs/SConscript
+9
-0
components/dfs/filesystems/ramfs/dfs_ramfs.c
components/dfs/filesystems/ramfs/dfs_ramfs.c
+400
-0
components/dfs/filesystems/ramfs/dfs_ramfs.h
components/dfs/filesystems/ramfs/dfs_ramfs.h
+46
-0
未找到文件。
components/dfs/filesystems/ramfs/SConscript
0 → 100644
浏览文件 @
0e16b6dc
from
building
import
*
cwd
=
GetCurrentDir
()
src
=
Glob
(
'*.c'
)
CPPPATH
=
[
cwd
]
group
=
DefineGroup
(
'Filesystem'
,
src
,
depend
=
[
'RT_USING_DFS'
,
'RT_USING_MEMHEAP'
],
CPPPATH
=
CPPPATH
)
Return
(
'group'
)
components/dfs/filesystems/ramfs/dfs_ramfs.c
0 → 100644
浏览文件 @
0e16b6dc
/*
* File : dfs_ramfs.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2011, Shanghai Real-Thread Technology Co., Ltd
*
* All rights reserved.
*
* Change Logs:
* Date Author Notes
* 2013-04-15 Bernard the first version
* 2013-05-05 Bernard remove CRC for ramfs persistence
*/
#include <rtthread.h>
#include <dfs.h>
#include <dfs_fs.h>
#include "dfs_ramfs.h"
int
dfs_ramfs_mount
(
struct
dfs_filesystem
*
fs
,
unsigned
long
rwflag
,
const
void
*
data
)
{
struct
dfs_ramfs
*
ramfs
;
if
(
data
==
RT_NULL
)
return
-
DFS_STATUS_EIO
;
ramfs
=
(
struct
dfs_ramfs
*
)
data
;
fs
->
data
=
ramfs
;
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_unmount
(
struct
dfs_filesystem
*
fs
)
{
fs
->
data
=
RT_NULL
;
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_statfs
(
struct
dfs_filesystem
*
fs
,
struct
statfs
*
buf
)
{
struct
dfs_ramfs
*
ramfs
;
ramfs
=
(
struct
dfs_ramfs
*
)
fs
->
data
;
RT_ASSERT
(
ramfs
!=
RT_NULL
);
RT_ASSERT
(
buf
!=
RT_NULL
);
buf
->
f_bsize
=
512
;
buf
->
f_blocks
=
ramfs
->
memheap
.
pool_size
/
512
;
buf
->
f_bfree
=
ramfs
->
memheap
.
available_size
/
512
;
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_ioctl
(
struct
dfs_fd
*
file
,
int
cmd
,
void
*
args
)
{
return
-
DFS_STATUS_EIO
;
}
struct
ramfs_dirent
*
dfs_ramfs_lookup
(
struct
dfs_ramfs
*
ramfs
,
const
char
*
path
,
rt_size_t
*
size
)
{
const
char
*
subpath
;
struct
ramfs_dirent
*
dirent
;
subpath
=
path
;
while
(
*
subpath
==
'/'
&&
*
subpath
)
subpath
++
;
if
(
!
*
subpath
)
/* is root directory */
{
*
size
=
0
;
return
&
(
ramfs
->
root
);
}
for
(
dirent
=
rt_list_entry
(
ramfs
->
root
.
list
.
next
,
struct
ramfs_dirent
,
list
);
dirent
!=
&
(
ramfs
->
root
);
dirent
=
rt_list_entry
(
dirent
->
list
.
next
,
struct
ramfs_dirent
,
list
))
{
if
(
rt_strcmp
(
dirent
->
name
,
subpath
)
==
0
)
{
*
size
=
dirent
->
size
;
return
dirent
;
}
}
/* not found */
return
RT_NULL
;
}
int
dfs_ramfs_read
(
struct
dfs_fd
*
file
,
void
*
buf
,
rt_size_t
count
)
{
rt_size_t
length
;
struct
ramfs_dirent
*
dirent
;
dirent
=
(
struct
ramfs_dirent
*
)
file
->
data
;
RT_ASSERT
(
dirent
!=
RT_NULL
);
if
(
count
<
file
->
size
-
file
->
pos
)
length
=
count
;
else
length
=
file
->
size
-
file
->
pos
;
if
(
length
>
0
)
memcpy
(
buf
,
&
(
dirent
->
data
[
file
->
pos
]),
length
);
/* update file current position */
file
->
pos
+=
length
;
return
length
;
}
int
dfs_ramfs_write
(
struct
dfs_fd
*
fd
,
const
void
*
buf
,
rt_size_t
count
)
{
struct
ramfs_dirent
*
dirent
;
struct
dfs_ramfs
*
ramfs
;
ramfs
=
(
struct
dfs_ramfs
*
)
fd
->
fs
->
data
;
RT_ASSERT
(
ramfs
!=
RT_NULL
);
dirent
=
(
struct
ramfs_dirent
*
)
fd
->
data
;
RT_ASSERT
(
dirent
!=
RT_NULL
);
if
(
count
+
fd
->
pos
>
fd
->
size
)
{
rt_uint8_t
*
ptr
;
ptr
=
rt_memheap_realloc
(
&
(
ramfs
->
memheap
),
dirent
->
data
,
fd
->
pos
+
count
);
if
(
ptr
==
RT_NULL
)
{
rt_set_errno
(
-
RT_ENOMEM
);
return
0
;
}
/* update dirent and file size */
dirent
->
data
=
ptr
;
dirent
->
size
=
fd
->
pos
+
count
;
fd
->
size
=
dirent
->
size
;
}
if
(
count
>
0
)
memcpy
(
dirent
->
data
+
fd
->
pos
,
buf
,
count
);
/* update file current position */
fd
->
pos
+=
count
;
return
count
;
}
int
dfs_ramfs_lseek
(
struct
dfs_fd
*
file
,
rt_off_t
offset
)
{
if
(
offset
<=
(
rt_off_t
)
file
->
size
)
{
file
->
pos
=
offset
;
return
file
->
pos
;
}
return
-
DFS_STATUS_EIO
;
}
int
dfs_ramfs_close
(
struct
dfs_fd
*
file
)
{
file
->
data
=
RT_NULL
;
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_open
(
struct
dfs_fd
*
file
)
{
rt_size_t
size
;
struct
dfs_ramfs
*
ramfs
;
struct
ramfs_dirent
*
dirent
;
ramfs
=
(
struct
dfs_ramfs
*
)
file
->
fs
->
data
;
RT_ASSERT
(
ramfs
!=
RT_NULL
);
if
(
file
->
flags
&
DFS_O_DIRECTORY
)
{
if
(
file
->
flags
&
DFS_O_CREAT
)
{
return
-
DFS_STATUS_ENOSPC
;
}
/* open directory */
dirent
=
dfs_ramfs_lookup
(
ramfs
,
file
->
path
,
&
size
);
if
(
dirent
==
RT_NULL
)
return
-
DFS_STATUS_ENOENT
;
if
(
dirent
==
&
(
ramfs
->
root
))
/* it's root directory */
{
if
(
!
(
file
->
flags
&
DFS_O_DIRECTORY
))
{
return
-
DFS_STATUS_ENOENT
;
}
}
}
else
{
dirent
=
dfs_ramfs_lookup
(
ramfs
,
file
->
path
,
&
size
);
if
(
dirent
==
&
(
ramfs
->
root
))
/* it's root directory */
{
return
-
DFS_STATUS_ENOENT
;
}
if
(
dirent
==
RT_NULL
)
{
if
(
file
->
flags
&
DFS_O_CREAT
||
file
->
flags
&
DFS_O_WRONLY
)
{
char
*
name_ptr
;
/* create a file entry */
dirent
=
(
struct
ramfs_dirent
*
)
rt_memheap_alloc
(
&
(
ramfs
->
memheap
),
sizeof
(
struct
ramfs_dirent
));
if
(
dirent
==
RT_NULL
)
{
return
-
DFS_STATUS_ENOMEM
;
}
/* remove '/' separator */
name_ptr
=
file
->
path
;
while
(
*
name_ptr
==
'/'
&&
*
name_ptr
)
name_ptr
++
;
strncpy
(
dirent
->
name
,
name_ptr
,
RAMFS_NAME_MAX
);
rt_list_init
(
&
(
dirent
->
list
));
dirent
->
data
=
RT_NULL
;
dirent
->
size
=
0
;
/* add to the root directory */
rt_list_insert_after
(
&
(
ramfs
->
root
.
list
),
&
(
dirent
->
list
));
}
}
/* Creates a new file. If the file is existing, it is truncated and overwritten. */
if
(
file
->
flags
&
DFS_O_TRUNC
)
{
dirent
->
size
=
0
;
if
(
dirent
->
data
!=
RT_NULL
)
{
rt_memheap_free
(
dirent
->
data
);
dirent
->
data
=
RT_NULL
;
}
}
}
file
->
data
=
dirent
;
file
->
size
=
dirent
->
size
;
file
->
pos
=
0
;
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_stat
(
struct
dfs_filesystem
*
fs
,
const
char
*
path
,
struct
stat
*
st
)
{
rt_size_t
size
;
struct
ramfs_dirent
*
dirent
;
struct
dfs_ramfs
*
ramfs
;
ramfs
=
(
struct
dfs_ramfs
*
)
fs
->
data
;
dirent
=
dfs_ramfs_lookup
(
ramfs
,
path
,
&
size
);
if
(
dirent
==
RT_NULL
)
return
-
DFS_STATUS_ENOENT
;
st
->
st_dev
=
0
;
st
->
st_mode
=
DFS_S_IFREG
|
DFS_S_IRUSR
|
DFS_S_IRGRP
|
DFS_S_IROTH
|
DFS_S_IWUSR
|
DFS_S_IWGRP
|
DFS_S_IWOTH
;
st
->
st_size
=
dirent
->
size
;
st
->
st_mtime
=
0
;
st
->
st_blksize
=
512
;
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_getdents
(
struct
dfs_fd
*
file
,
struct
dirent
*
dirp
,
rt_uint32_t
count
)
{
rt_size_t
index
,
end
;
struct
dirent
*
d
;
struct
ramfs_dirent
*
dirent
;
struct
dfs_ramfs
*
ramfs
;
ramfs
=
(
struct
dfs_ramfs
*
)
file
->
fs
->
data
;
dirent
=
(
struct
ramfs_dirent
*
)
file
->
data
;
if
(
dirent
!=
&
(
ramfs
->
root
))
return
-
DFS_STATUS_EINVAL
;
/* make integer count */
count
=
(
count
/
sizeof
(
struct
dirent
));
if
(
count
==
0
)
return
-
DFS_STATUS_EINVAL
;
end
=
file
->
pos
+
count
;
index
=
0
;
count
=
0
;
for
(
dirent
=
rt_list_entry
(
dirent
->
list
.
next
,
struct
ramfs_dirent
,
list
);
dirent
!=
&
(
ramfs
->
root
)
&&
index
<
end
;
dirent
=
rt_list_entry
(
dirent
->
list
.
next
,
struct
ramfs_dirent
,
list
))
{
if
(
index
>=
(
rt_size_t
)
file
->
pos
)
{
d
=
dirp
+
count
;
d
->
d_type
=
DFS_DT_REG
;
d
->
d_namlen
=
RT_NAME_MAX
;
d
->
d_reclen
=
(
rt_uint16_t
)
sizeof
(
struct
dirent
);
rt_strncpy
(
d
->
d_name
,
dirent
->
name
,
RAMFS_NAME_MAX
);
count
+=
1
;
file
->
pos
+=
1
;
}
index
+=
1
;
}
return
count
*
sizeof
(
struct
dirent
);
}
int
dfs_ramfs_unlink
(
struct
dfs_filesystem
*
fs
,
const
char
*
path
)
{
rt_size_t
size
;
struct
dfs_ramfs
*
ramfs
;
struct
ramfs_dirent
*
dirent
;
ramfs
=
(
struct
dfs_ramfs
*
)
fs
->
data
;
RT_ASSERT
(
ramfs
!=
RT_NULL
);
dirent
=
dfs_ramfs_lookup
(
ramfs
,
path
,
&
size
);
if
(
dirent
==
RT_NULL
)
return
-
DFS_STATUS_ENOENT
;
rt_list_remove
(
&
(
dirent
->
list
));
if
(
dirent
->
data
!=
RT_NULL
)
rt_memheap_free
(
dirent
->
data
);
rt_memheap_free
(
dirent
);
return
DFS_STATUS_OK
;
}
int
dfs_ramfs_rename
(
struct
dfs_filesystem
*
fs
,
const
char
*
oldpath
,
const
char
*
newpath
)
{
struct
ramfs_dirent
*
dirent
;
struct
dfs_ramfs
*
ramfs
;
rt_size_t
size
;
ramfs
=
(
struct
dfs_ramfs
*
)
fs
->
data
;
RT_ASSERT
(
ramfs
!=
RT_NULL
);
dirent
=
dfs_ramfs_lookup
(
ramfs
,
newpath
,
&
size
);
if
(
dirent
!=
RT_NULL
)
return
-
DFS_STATUS_EEXIST
;
dirent
=
dfs_ramfs_lookup
(
ramfs
,
oldpath
,
&
size
);
if
(
dirent
==
RT_NULL
)
return
-
DFS_STATUS_ENOENT
;
strncpy
(
dirent
->
name
,
newpath
,
RAMFS_NAME_MAX
);
return
DFS_STATUS_OK
;
}
static
const
struct
dfs_filesystem_operation
_ramfs
=
{
"ram"
,
DFS_FS_FLAG_DEFAULT
,
dfs_ramfs_mount
,
dfs_ramfs_unmount
,
RT_NULL
,
/* mkfs */
dfs_ramfs_statfs
,
dfs_ramfs_open
,
dfs_ramfs_close
,
dfs_ramfs_ioctl
,
dfs_ramfs_read
,
dfs_ramfs_write
,
RT_NULL
,
/* flush */
dfs_ramfs_lseek
,
dfs_ramfs_getdents
,
dfs_ramfs_unlink
,
dfs_ramfs_stat
,
dfs_ramfs_rename
,
};
int
dfs_ramfs_init
(
void
)
{
/* register ram file system */
dfs_register
(
&
_ramfs
);
return
0
;
}
struct
dfs_ramfs
*
dfs_ramfs_create
(
rt_uint8_t
*
pool
,
rt_size_t
size
)
{
struct
dfs_ramfs
*
ramfs
;
rt_uint8_t
*
data_ptr
;
rt_err_t
result
;
size
=
RT_ALIGN_DOWN
(
size
,
RT_ALIGN_SIZE
);
ramfs
=
(
struct
dfs_ramfs
*
)
pool
;
data_ptr
=
(
rt_uint8_t
*
)(
ramfs
+
1
);
size
=
size
-
sizeof
(
struct
dfs_ramfs
);
size
=
RT_ALIGN_DOWN
(
size
,
RT_ALIGN_SIZE
);
result
=
rt_memheap_init
(
&
ramfs
->
memheap
,
"ramfs"
,
data_ptr
,
size
);
if
(
result
!=
RT_EOK
)
return
RT_NULL
;
/* detach this memheap object from the system */
rt_object_detach
((
rt_object_t
)
&
(
ramfs
->
memheap
));
/* initialize ramfs object */
ramfs
->
magic
=
RAMFS_MAGIC
;
/* initialize root directory */
memset
(
&
(
ramfs
->
root
),
0x00
,
sizeof
(
ramfs
->
root
));
rt_list_init
(
&
(
ramfs
->
root
.
list
));
ramfs
->
root
.
size
=
0
;
strcpy
(
ramfs
->
root
.
name
,
"."
);
return
ramfs
;
}
components/dfs/filesystems/ramfs/dfs_ramfs.h
0 → 100644
浏览文件 @
0e16b6dc
/*
* File : dfs_ramfs.h
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2011, Shanghai Real-Thread Technology Co., Ltd
*
* All rights reserved.
*
* Change Logs:
* Date Author Notes
* 2013-04-15 Bernard the first version
* 2013-05-05 Bernard remove CRC for ramfs persistence
*/
#ifndef __DFS_ROMFS_H__
#define __DFS_ROMFS_H__
#include <rtthread.h>
#include <rtservice.h>
#define RAMFS_NAME_MAX 32
#define RAMFS_MAGIC 0x0A0A0A0A
struct
ramfs_dirent
{
rt_list_t
list
;
char
name
[
RAMFS_NAME_MAX
];
/* dirent name */
rt_uint8_t
*
data
;
rt_size_t
size
;
/* file size */
};
/**
* DFS ramfs object
*/
struct
dfs_ramfs
{
rt_uint32_t
magic
;
struct
rt_memheap
memheap
;
struct
ramfs_dirent
root
;
};
int
dfs_ramfs_init
(
void
);
struct
dfs_ramfs
*
dfs_ramfs_create
(
rt_uint8_t
*
pool
,
rt_size_t
size
);
#endif
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