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8f47a016
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8f47a016
编写于
5月 09, 2015
作者:
A
Al Viro
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
namei: handle absolute symlinks without dropping out of RCU mode
Signed-off-by:
N
Al Viro
<
viro@zeniv.linux.org.uk
>
上级
8c1b4566
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
20 addition
and
11 deletion
+20
-11
fs/namei.c
fs/namei.c
+20
-11
未找到文件。
fs/namei.c
浏览文件 @
8f47a016
...
...
@@ -499,7 +499,7 @@ struct nameidata {
struct
path
root
;
struct
inode
*
inode
;
/* path.dentry.d_inode */
unsigned
int
flags
;
unsigned
seq
,
m_seq
;
unsigned
seq
,
m_seq
,
root_seq
;
int
last_type
;
unsigned
depth
;
int
total_link_count
;
...
...
@@ -788,14 +788,14 @@ static __always_inline void set_root(struct nameidata *nd)
static
__always_inline
unsigned
set_root_rcu
(
struct
nameidata
*
nd
)
{
struct
fs_struct
*
fs
=
current
->
fs
;
unsigned
seq
,
res
;
unsigned
seq
;
do
{
seq
=
read_seqcount_begin
(
&
fs
->
seq
);
nd
->
root
=
fs
->
root
;
res
=
__read_seqcount_begin
(
&
nd
->
root
.
dentry
->
d_seq
);
nd
->
root_seq
=
__read_seqcount_begin
(
&
nd
->
root
.
dentry
->
d_seq
);
}
while
(
read_seqcount_retry
(
&
fs
->
seq
,
seq
));
return
res
;
return
nd
->
root_seq
;
}
static
void
path_put_conditional
(
struct
path
*
path
,
struct
nameidata
*
nd
)
...
...
@@ -995,15 +995,23 @@ const char *get_link(struct nameidata *nd)
}
if
(
*
res
==
'/'
)
{
if
(
nd
->
flags
&
LOOKUP_RCU
)
{
if
(
unlikely
(
unlazy_walk
(
nd
,
NULL
,
0
)))
struct
dentry
*
d
;
if
(
!
nd
->
root
.
mnt
)
set_root_rcu
(
nd
);
nd
->
path
=
nd
->
root
;
d
=
nd
->
path
.
dentry
;
nd
->
inode
=
d
->
d_inode
;
nd
->
seq
=
nd
->
root_seq
;
if
(
unlikely
(
read_seqcount_retry
(
&
d
->
d_seq
,
nd
->
seq
)))
return
ERR_PTR
(
-
ECHILD
);
}
else
{
if
(
!
nd
->
root
.
mnt
)
set_root
(
nd
);
path_put
(
&
nd
->
path
);
nd
->
path
=
nd
->
root
;
path_get
(
&
nd
->
root
);
nd
->
inode
=
nd
->
path
.
dentry
->
d_inode
;
}
if
(
!
nd
->
root
.
mnt
)
set_root
(
nd
);
path_put
(
&
nd
->
path
);
nd
->
path
=
nd
->
root
;
path_get
(
&
nd
->
root
);
nd
->
inode
=
nd
->
path
.
dentry
->
d_inode
;
nd
->
flags
|=
LOOKUP_JUMPED
;
while
(
unlikely
(
*++
res
==
'/'
))
;
...
...
@@ -1979,6 +1987,7 @@ static const char *path_init(int dfd, const struct filename *name,
if
(
flags
&
LOOKUP_RCU
)
{
rcu_read_lock
();
nd
->
seq
=
__read_seqcount_begin
(
&
nd
->
path
.
dentry
->
d_seq
);
nd
->
root_seq
=
nd
->
seq
;
nd
->
m_seq
=
read_seqbegin
(
&
mount_lock
);
}
else
{
path_get
(
&
nd
->
path
);
...
...
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