vfs: turn is_dir argument to kern_path_create into a lookup_flags arg

Where we can pass in LOOKUP_DIRECTORY or LOOKUP_REVAL. Any other flags
passed in here are currently ignored.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 20 insertions, 9 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/syscalls.c b/arch/powerpc/platforms/cell/spufs/syscalls.c
index 5b7d8ffbf890..baee994fe810 100644
--- a/arch/powerpc/platforms/cell/spufs/syscalls.c
+++ b/arch/powerpc/platforms/cell/spufs/syscalls.c
@@ -66,7 +66,7 @@ static long do_spu_create(const char __user *pathname, unsigned int flags,
         struct dentry *dentry;
         int ret;
 
-        dentry = user_path_create(AT_FDCWD, pathname, &path, 1);
+        dentry = user_path_create(AT_FDCWD, pathname, &path, LOOKUP_DIRECTORY);
         ret = PTR_ERR(dentry);
         if (!IS_ERR(dentry)) {
                 ret = spufs_create(&path, dentry, flags, mode, neighbor);
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 147d1a4dd269..17cf7cad601e 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -148,7 +148,7 @@ static int dev_mkdir(const char *name, umode_t mode)
         struct path path;
         int err;
 
-        dentry = kern_path_create(AT_FDCWD, name, &path, 1);
+        dentry = kern_path_create(AT_FDCWD, name, &path, LOOKUP_DIRECTORY);
         if (IS_ERR(dentry))
                 return PTR_ERR(dentry);
 
diff --git a/fs/namei.c b/fs/namei.c
index 25a41e02984b..8f8e41f6eb52 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3030,12 +3030,22 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
         return file;
 }
 
-struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, int is_dir)
+struct dentry *kern_path_create(int dfd, const char *pathname,
+                                struct path *path, unsigned int lookup_flags)
 {
         struct dentry *dentry = ERR_PTR(-EEXIST);
         struct nameidata nd;
         int err2;
-        int error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd);
+        int error;
+        bool is_dir = (lookup_flags & LOOKUP_DIRECTORY);
+
+        /*
+         * Note that only LOOKUP_REVAL and LOOKUP_DIRECTORY matter here. Any
+         * other flags passed in are ignored!
+         */
+        lookup_flags &= LOOKUP_REVAL;
+
+        error = do_path_lookup(dfd, pathname, LOOKUP_PARENT|lookup_flags, &nd);
         if (error)
                 return ERR_PTR(error);
 
@@ -3099,13 +3109,14 @@ void done_path_create(struct path *path, struct dentry *dentry)
 }
 EXPORT_SYMBOL(done_path_create);
 
-struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir)
+struct dentry *user_path_create(int dfd, const char __user *pathname,
+                                struct path *path, unsigned int lookup_flags)
 {
         struct filename *tmp = getname(pathname);
         struct dentry *res;
         if (IS_ERR(tmp))
                 return ERR_CAST(tmp);
-        res = kern_path_create(dfd, tmp->name, path, is_dir);
+        res = kern_path_create(dfd, tmp->name, path, lookup_flags);
         putname(tmp);
         return res;
 }
@@ -3228,7 +3239,7 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
         struct path path;
         int error;
 
-        dentry = user_path_create(dfd, pathname, &path, 1);
+        dentry = user_path_create(dfd, pathname, &path, LOOKUP_DIRECTORY);
         if (IS_ERR(dentry))
                 return PTR_ERR(dentry);
 
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 66542b644804..e998c030061d 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -65,8 +65,8 @@ extern int user_path_at_empty(int, const char __user *, unsigned, struct path *,
 
 extern int kern_path(const char *, unsigned, struct path *);
 
-extern struct dentry *kern_path_create(int, const char *, struct path *, int);
-extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
+extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
+extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
 extern void done_path_create(struct path *, struct dentry *);
 extern struct dentry *kern_path_locked(const char *, struct path *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,