Skip to content
体验新版
项目
组织
正在加载...
登录
切换导航
打开侧边栏
openeuler
Kernel
提交
3567866b
K
Kernel
项目概览
openeuler
/
Kernel
1 年多 前同步成功
通知
8
Star
0
Fork
0
代码
文件
提交
分支
Tags
贡献者
分支图
Diff
Issue
0
列表
看板
标记
里程碑
合并请求
0
DevOps
流水线
流水线任务
计划
Wiki
0
Wiki
分析
仓库
DevOps
项目成员
Pages
K
Kernel
项目概览
项目概览
详情
发布
仓库
仓库
文件
提交
分支
标签
贡献者
分支图
比较
Issue
0
Issue
0
列表
看板
标记
里程碑
合并请求
0
合并请求
0
Pages
DevOps
DevOps
流水线
流水线任务
计划
分析
分析
仓库分析
DevOps
Wiki
0
Wiki
成员
成员
收起侧边栏
关闭侧边栏
动态
分支图
创建新Issue
流水线任务
提交
Issue看板
提交
3567866b
编写于
13年前
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
RCUify freeing acls, let check_acl() go ahead in RCU mode if acl is cached
Signed-off-by:
N
Al Viro
<
viro@zeniv.linux.org.uk
>
上级
951c0d66
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
15 addition
and
20 deletion
+15
-20
fs/namei.c
fs/namei.c
+6
-11
include/linux/posix_acl.h
include/linux/posix_acl.h
+9
-9
未找到文件。
fs/namei.c
浏览文件 @
3567866b
...
...
@@ -179,19 +179,14 @@ static int check_acl(struct inode *inode, int mask)
#ifdef CONFIG_FS_POSIX_ACL
struct
posix_acl
*
acl
;
/*
* Under RCU walk, we cannot even do a "get_cached_acl()",
* because that involves locking and getting a refcount on
* a cached ACL.
*
* So the only case we handle during RCU walking is the
* case of a cached "no ACL at all", which needs no locks
* or refcounts.
*/
if
(
mask
&
MAY_NOT_BLOCK
)
{
if
(
negative_cached_acl
(
inode
,
ACL_TYPE_ACCESS
))
acl
=
get_cached_acl_rcu
(
inode
,
ACL_TYPE_ACCESS
);
if
(
!
acl
)
return
-
EAGAIN
;
return
-
ECHILD
;
/* no ->get_acl() calls in RCU mode... */
if
(
acl
==
ACL_NOT_CACHED
)
return
-
ECHILD
;
return
posix_acl_permission
(
inode
,
acl
,
mask
);
}
acl
=
get_cached_acl
(
inode
,
ACL_TYPE_ACCESS
);
...
...
This diff is collapsed.
Click to expand it.
include/linux/posix_acl.h
浏览文件 @
3567866b
...
...
@@ -9,6 +9,7 @@
#define __LINUX_POSIX_ACL_H
#include <linux/slab.h>
#include <linux/rcupdate.h>
#define ACL_UNDEFINED_ID (-1)
...
...
@@ -38,7 +39,10 @@ struct posix_acl_entry {
};
struct
posix_acl
{
atomic_t
a_refcount
;
union
{
atomic_t
a_refcount
;
struct
rcu_head
a_rcu
;
};
unsigned
int
a_count
;
struct
posix_acl_entry
a_entries
[
0
];
};
...
...
@@ -65,7 +69,7 @@ static inline void
posix_acl_release
(
struct
posix_acl
*
acl
)
{
if
(
acl
&&
atomic_dec_and_test
(
&
acl
->
a_refcount
))
kfree
(
acl
);
kfree
_rcu
(
acl
,
a_rcu
);
}
...
...
@@ -110,13 +114,9 @@ static inline struct posix_acl *get_cached_acl(struct inode *inode, int type)
return
acl
;
}
static
inline
int
negative_cached_acl
(
struct
inode
*
inode
,
int
type
)
static
inline
struct
posix_acl
*
get_cached_acl_rcu
(
struct
inode
*
inode
,
int
type
)
{
struct
posix_acl
**
p
=
acl_by_type
(
inode
,
type
);
struct
posix_acl
*
acl
=
ACCESS_ONCE
(
*
p
);
if
(
acl
)
return
0
;
return
1
;
return
rcu_dereference
(
*
acl_by_type
(
inode
,
type
));
}
static
inline
void
set_cached_acl
(
struct
inode
*
inode
,
...
...
@@ -127,7 +127,7 @@ static inline void set_cached_acl(struct inode *inode,
struct
posix_acl
*
old
;
spin_lock
(
&
inode
->
i_lock
);
old
=
*
p
;
*
p
=
posix_dup_acl
(
acl
);
rcu_assign_pointer
(
*
p
,
posix_acl_dup
(
acl
)
);
spin_unlock
(
&
inode
->
i_lock
);
if
(
old
!=
ACL_NOT_CACHED
)
posix_acl_release
(
old
);
...
...
This diff is collapsed.
Click to expand it.
编辑
预览
Markdown
is supported
0%
请重试
或
添加新附件
.
添加附件
取消
You are about to add
0
people
to the discussion. Proceed with caution.
先完成此消息的编辑!
取消
想要评论请
注册
或
登录
反馈
建议
客服
返回
顶部