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-rw-r--r--fs/internal.h1
-rw-r--r--fs/namei.c31
-rw-r--r--fs/namespace.c33
3 files changed, 39 insertions, 26 deletions
diff --git a/fs/internal.h b/fs/internal.h
index 12ccb86..e8a0b24 100644
--- 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..b753192d 100644
--- 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
--- 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.
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