Make set_fs_{root,pwd} take a struct path

In nearly all cases the set_fs_{root,pwd}() calls work on a struct
path. Change the function to reflect this and use path_get() here.

Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 18 insertions, 22 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index ac19212c9bc3..eef57635ee07 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1650,15 +1650,14 @@ out1:
  * Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values.
  * It can block. Requires the big lock held.
  */
-void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
-                 struct dentry *dentry)
+void set_fs_root(struct fs_struct *fs, struct path *path)
 {
         struct path old_root;
 
         write_lock(&fs->lock);
         old_root = fs->root;
-        fs->root.mnt = mntget(mnt);
-        fs->root.dentry = dget(dentry);
+        fs->root = *path;
+        path_get(path);
         write_unlock(&fs->lock);
         if (old_root.dentry)
                 path_put(&old_root);
@@ -1668,15 +1667,14 @@ void set_fs_root(struct fs_struct *fs, struct vfsmount *mnt,
  * Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values.
  * It can block. Requires the big lock held.
  */
-void set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
-                struct dentry *dentry)
+void set_fs_pwd(struct fs_struct *fs, struct path *path)
 {
         struct path old_pwd;
 
         write_lock(&fs->lock);
         old_pwd = fs->pwd;
-        fs->pwd.mnt = mntget(mnt);
-        fs->pwd.dentry = dget(dentry);
+        fs->pwd = *path;
+        path_get(path);
         write_unlock(&fs->lock);
 
         if (old_pwd.dentry)
@@ -1697,12 +1695,10 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
                         task_unlock(p);
                         if (fs->root.dentry == old_nd->path.dentry
                             && fs->root.mnt == old_nd->path.mnt)
-                                set_fs_root(fs, new_nd->path.mnt,
-                                            new_nd->path.dentry);
+                                set_fs_root(fs, &new_nd->path);
                         if (fs->pwd.dentry == old_nd->path.dentry
                             && fs->pwd.mnt == old_nd->path.mnt)
-                                set_fs_pwd(fs, new_nd->path.mnt,
-                                           new_nd->path.dentry);
+                                set_fs_pwd(fs, &new_nd->path);
                         put_fs_struct(fs);
                 } else
                         task_unlock(p);
@@ -1845,6 +1841,7 @@ static void __init init_mount_tree(void)
 {
         struct vfsmount *mnt;
         struct mnt_namespace *ns;
+        struct path root;
 
         mnt = do_kern_mount("rootfs", 0, "rootfs", NULL);
         if (IS_ERR(mnt))
@@ -1863,8 +1860,11 @@ static void __init init_mount_tree(void)
         init_task.nsproxy->mnt_ns = ns;
         get_mnt_ns(ns);
 
-        set_fs_pwd(current->fs, ns->root, ns->root->mnt_root);
-        set_fs_root(current->fs, ns->root, ns->root->mnt_root);
+        root.mnt = ns->root;
+        root.dentry = ns->root->mnt_root;
+
+        set_fs_pwd(current->fs, &root);
+        set_fs_root(current->fs, &root);
 }
 
 void __init mnt_init(void)
diff --git a/fs/open.c b/fs/open.c
index ca8ac4bbd3bd..54198538b67e 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -490,7 +490,7 @@ asmlinkage long sys_chdir(const char __user * filename)
         if (error)
                 goto dput_and_out;
 
-        set_fs_pwd(current->fs, nd.path.mnt, nd.path.dentry);
+        set_fs_pwd(current->fs, &nd.path);
 
 dput_and_out:
         path_put(&nd.path);
@@ -501,9 +501,7 @@ out:
 asmlinkage long sys_fchdir(unsigned int fd)
 {
         struct file *file;
-        struct dentry *dentry;
         struct inode *inode;
-        struct vfsmount *mnt;
         int error;
 
         error = -EBADF;
@@ -511,9 +509,7 @@ asmlinkage long sys_fchdir(unsigned int fd)
         if (!file)
                 goto out;
 
-        dentry = file->f_path.dentry;
-        mnt = file->f_path.mnt;
-        inode = dentry->d_inode;
+        inode = file->f_path.dentry->d_inode;
 
         error = -ENOTDIR;
         if (!S_ISDIR(inode->i_mode))
@@ -521,7 +517,7 @@ asmlinkage long sys_fchdir(unsigned int fd)
 
         error = file_permission(file, MAY_EXEC);
         if (!error)
-                set_fs_pwd(current->fs, mnt, dentry);
+                set_fs_pwd(current->fs, &file->f_path);
 out_putf:
         fput(file);
 out:
@@ -545,7 +541,7 @@ asmlinkage long sys_chroot(const char __user * filename)
         if (!capable(CAP_SYS_CHROOT))
                 goto dput_and_out;
 
-        set_fs_root(current->fs, nd.path.mnt, nd.path.dentry);
+        set_fs_root(current->fs, &nd.path);
         set_fs_altroot();
         error = 0;
 dput_and_out: