lkml.org 
[lkml]   [2012]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 02/17] vfs: add a kern_path_at function
Date
This will function like user_path_at, but does not do the getname and
putname, leaving that to the caller.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/namei.c | 27 +++++++++++++++++++--------
include/linux/namei.h | 1 +
2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 3580d47..b6fbe3d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1974,20 +1974,31 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
return __lookup_hash(&this, base, 0);
}

+int kern_path_at(int dfd, const char *name, unsigned flags, struct path *path)
+{
+ struct nameidata nd;
+ int err;
+
+ BUG_ON(flags & LOOKUP_PARENT);
+
+ err = do_path_lookup(dfd, name, flags, &nd);
+ if (!err)
+ *path = nd.path;
+
+ return err;
+}
+
int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
struct path *path, int *empty)
{
- struct nameidata nd;
char *tmp = getname_flags(name, flags, empty);
- int err = PTR_ERR(tmp);
- if (!IS_ERR(tmp)) {
-
- BUG_ON(flags & LOOKUP_PARENT);
+ int err;

- err = do_path_lookup(dfd, tmp, flags, &nd);
+ if (IS_ERR(tmp)) {
+ err = PTR_ERR(tmp);
+ } else {
+ err = kern_path_at(dfd, tmp, flags, path);
putname(tmp);
- if (!err)
- *path = nd.path;
}
return err;
}
diff --git a/include/linux/namei.h b/include/linux/namei.h
index d2ef8b3..002dc55 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -55,6 +55,7 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
#define LOOKUP_ROOT 0x2000
#define LOOKUP_EMPTY 0x4000

+extern int kern_path_at(int, const char *, unsigned, struct path *);
extern int user_path_at(int, const char __user *, unsigned, struct path *);
extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);

--
1.7.11.2


\
 
 \ /
  Last update: 2012-07-26 17:21    [W:0.153 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site