Take the completion of automount into new helper

... and shift it from namei.c to namespace.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/internal.h b/fs/internal.h
index 12ccb86..e8a0b24 100644 (file)
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -70,6 +70,7 @@ extern void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
 extern void release_mounts(struct list_head *);
 extern void umount_tree(struct vfsmount *, int, struct list_head *);
 extern struct vfsmount *copy_tree(struct vfsmount *, struct dentry *, int);
+extern int finish_automount(struct vfsmount *, struct path *);
 extern int do_add_mount(struct vfsmount *, struct path *, int);
 extern void mnt_clear_expiry(struct vfsmount *);
 

diff --git a/fs/namei.c b/fs/namei.c
index 8f7b41a..b753192 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -923,37 +923,13 @@ static int follow_automount(struct path *path, unsigned flags,
        if (!mnt) /* mount collision */
                return 0;
 
-       /* The new mount record should have at least 2 refs to prevent it being
-        * expired before we get a chance to add it
-        */
-       BUG_ON(mnt_get_count(mnt) < 2);
-
-       if (mnt->mnt_sb == path->mnt->mnt_sb &&
-           mnt->mnt_root == path->dentry) {
-               mnt_clear_expiry(mnt);
-               mntput(mnt);
-               mntput(mnt);
-               return -ELOOP;
-       }
+       err = finish_automount(mnt, path);
 
-       /* We need to add the mountpoint to the parent.  The filesystem may
-        * have placed it on an expiry list, and so we need to make sure it
-        * won't be expired under us if do_add_mount() fails (do_add_mount()
-        * will eat a reference unconditionally).
-        */
-       mntget(mnt);
-       err = do_add_mount(mnt, path, path->mnt->mnt_flags | MNT_SHRINKABLE);
        switch (err) {
        case -EBUSY:
                /* Someone else made a mount here whilst we were busy */
-               err = 0;
-       default:
-               mnt_clear_expiry(mnt);
-               mntput(mnt);
-               mntput(mnt);
-               return err;
+               return 0;
        case 0:
-               mntput(mnt);
                dput(path->dentry);
                if (*need_mntput)
                        mntput(path->mnt);
@@ -961,7 +937,10 @@ static int follow_automount(struct path *path, unsigned flags,
                path->dentry = dget(mnt->mnt_root);
                *need_mntput = true;
                return 0;
+       default:
+               return err;
        }
+
 }
 
 /*

diff --git a/fs/namespace.c b/fs/namespace.c
index 9f544f3..bec51e4 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1895,6 +1895,39 @@ static int do_new_mount(struct path *path, char *type, int flags,
        return do_add_mount(mnt, path, mnt_flags);
 }
 
+int finish_automount(struct vfsmount *m, struct path *path)
+{
+       int err;
+       /* The new mount record should have at least 2 refs to prevent it being
+        * expired before we get a chance to add it
+        */
+       BUG_ON(mnt_get_count(m) < 2);
+
+       if (m->mnt_sb == path->mnt->mnt_sb &&
+           m->mnt_root == path->dentry) {
+               mnt_clear_expiry(m);
+               mntput(m);
+               mntput(m);
+               return -ELOOP;
+       }
+
+       /* We need to add the mountpoint to the parent.  The filesystem may
+        * have placed it on an expiry list, and so we need to make sure it
+        * won't be expired under us if do_add_mount() fails (do_add_mount()
+        * will eat a reference unconditionally).
+        */
+       mntget(m);
+       err = do_add_mount(m, path, path->mnt->mnt_flags | MNT_SHRINKABLE);
+       if (err) {
+               mnt_clear_expiry(m);
+               mntput(m);
+               mntput(m);
+       } else {
+               mntput(m);
+       }
+       return err;
+}
+
 /*
  * add a mount into a namespace's mount tree
  * - this unconditionally eats one of the caller's references to newmnt.