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体验新版 GitCode,发现更多精彩内容 >>
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3c95f0dc
编写于
4月 06, 2018
作者:
A
Al Viro
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
merge common parts of lookup_one_len{,_unlocked} into common helper
Signed-off-by:
N
Al Viro
<
viro@zeniv.linux.org.uk
>
上级
04bbc979
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
34 addition
and
56 deletion
+34
-56
fs/namei.c
fs/namei.c
+34
-56
未找到文件。
fs/namei.c
浏览文件 @
3c95f0dc
...
...
@@ -2417,52 +2417,57 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
}
EXPORT_SYMBOL
(
vfs_path_lookup
);
/**
* lookup_one_len - filesystem helper to lookup single pathname component
* @name: pathname component to lookup
* @base: base directory to lookup from
* @len: maximum length @len should be interpreted to
*
* Note that this routine is purely a helper for filesystem usage and should
* not be called by generic code.
*
* The caller must hold base->i_mutex.
*/
struct
dentry
*
lookup_one_len
(
const
char
*
name
,
struct
dentry
*
base
,
int
len
)
static
int
lookup_one_len_common
(
const
char
*
name
,
struct
dentry
*
base
,
int
len
,
struct
qstr
*
this
)
{
struct
qstr
this
;
unsigned
int
c
;
int
err
;
WARN_ON_ONCE
(
!
inode_is_locked
(
base
->
d_inode
));
this
.
name
=
name
;
this
.
len
=
len
;
this
.
hash
=
full_name_hash
(
base
,
name
,
len
);
this
->
name
=
name
;
this
->
len
=
len
;
this
->
hash
=
full_name_hash
(
base
,
name
,
len
);
if
(
!
len
)
return
ERR_PTR
(
-
EACCES
)
;
return
-
EACCES
;
if
(
unlikely
(
name
[
0
]
==
'.'
))
{
if
(
len
<
2
||
(
len
==
2
&&
name
[
1
]
==
'.'
))
return
ERR_PTR
(
-
EACCES
)
;
return
-
EACCES
;
}
while
(
len
--
)
{
c
=
*
(
const
unsigned
char
*
)
name
++
;
unsigned
int
c
=
*
(
const
unsigned
char
*
)
name
++
;
if
(
c
==
'/'
||
c
==
'\0'
)
return
ERR_PTR
(
-
EACCES
)
;
return
-
EACCES
;
}
/*
* See if the low-level filesystem might want
* to use its own hash..
*/
if
(
base
->
d_flags
&
DCACHE_OP_HASH
)
{
int
err
=
base
->
d_op
->
d_hash
(
base
,
&
this
);
int
err
=
base
->
d_op
->
d_hash
(
base
,
this
);
if
(
err
<
0
)
return
ERR_PTR
(
err
)
;
return
err
;
}
err
=
inode_permission
(
base
->
d_inode
,
MAY_EXEC
);
return
inode_permission
(
base
->
d_inode
,
MAY_EXEC
);
}
/**
* lookup_one_len - filesystem helper to lookup single pathname component
* @name: pathname component to lookup
* @base: base directory to lookup from
* @len: maximum length @len should be interpreted to
*
* Note that this routine is purely a helper for filesystem usage and should
* not be called by generic code.
*
* The caller must hold base->i_mutex.
*/
struct
dentry
*
lookup_one_len
(
const
char
*
name
,
struct
dentry
*
base
,
int
len
)
{
struct
qstr
this
;
int
err
;
WARN_ON_ONCE
(
!
inode_is_locked
(
base
->
d_inode
));
err
=
lookup_one_len_common
(
name
,
base
,
len
,
&
this
);
if
(
err
)
return
ERR_PTR
(
err
);
...
...
@@ -2486,37 +2491,10 @@ struct dentry *lookup_one_len_unlocked(const char *name,
struct
dentry
*
base
,
int
len
)
{
struct
qstr
this
;
unsigned
int
c
;
int
err
;
struct
dentry
*
ret
;
this
.
name
=
name
;
this
.
len
=
len
;
this
.
hash
=
full_name_hash
(
base
,
name
,
len
);
if
(
!
len
)
return
ERR_PTR
(
-
EACCES
);
if
(
unlikely
(
name
[
0
]
==
'.'
))
{
if
(
len
<
2
||
(
len
==
2
&&
name
[
1
]
==
'.'
))
return
ERR_PTR
(
-
EACCES
);
}
while
(
len
--
)
{
c
=
*
(
const
unsigned
char
*
)
name
++
;
if
(
c
==
'/'
||
c
==
'\0'
)
return
ERR_PTR
(
-
EACCES
);
}
/*
* See if the low-level filesystem might want
* to use its own hash..
*/
if
(
base
->
d_flags
&
DCACHE_OP_HASH
)
{
int
err
=
base
->
d_op
->
d_hash
(
base
,
&
this
);
if
(
err
<
0
)
return
ERR_PTR
(
err
);
}
err
=
inode_permission
(
base
->
d_inode
,
MAY_EXEC
);
err
=
lookup_one_len_common
(
name
,
base
,
len
,
&
this
);
if
(
err
)
return
ERR_PTR
(
err
);
...
...
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