open-style analog of vfs_path_lookup()
new function: file_open_root(dentry, mnt, name, flags) opens the file
vfs_path_lookup would arrive to.
Note that name can be empty; in that case the usual requirement that
dentry should be a directory is lifted.
open-coded equivalents switched to it, may_open() got down exactly
one caller and became static.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index b875bed..3b8e028 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -1321,13 +1321,11 @@
void __user *oldval, size_t oldlen, void __user *newval, size_t newlen)
{
const struct bin_table *table = NULL;
- struct nameidata nd;
struct vfsmount *mnt;
struct file *file;
ssize_t result;
char *pathname;
int flags;
- int acc_mode;
pathname = sysctl_getname(name, nlen, &table);
result = PTR_ERR(pathname);
@@ -1337,28 +1335,17 @@
/* How should the sysctl be accessed? */
if (oldval && oldlen && newval && newlen) {
flags = O_RDWR;
- acc_mode = MAY_READ | MAY_WRITE;
} else if (newval && newlen) {
flags = O_WRONLY;
- acc_mode = MAY_WRITE;
} else if (oldval && oldlen) {
flags = O_RDONLY;
- acc_mode = MAY_READ;
} else {
result = 0;
goto out_putname;
}
mnt = current->nsproxy->pid_ns->proc_mnt;
- result = vfs_path_lookup(mnt->mnt_root, mnt, pathname, 0, &nd);
- if (result)
- goto out_putname;
-
- result = may_open(&nd.path, acc_mode, flags);
- if (result)
- goto out_putpath;
-
- file = dentry_open(nd.path.dentry, nd.path.mnt, flags, current_cred());
+ file = file_open_root(mnt->mnt_root, mnt, pathname, flags);
result = PTR_ERR(file);
if (IS_ERR(file))
goto out_putname;
@@ -1370,10 +1357,6 @@
putname(pathname);
out:
return result;
-
-out_putpath:
- path_put(&nd.path);
- goto out_putname;
}