| From | David Howells <> | Subject | [PATCH 29/73] union-mount: Create IS_MNT_UNION() [ver #2] | Date | Tue, 21 Feb 2012 18:01:11 +0000 |
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From: Jan Blunck <jblunck@suse.de>
IS_MNT_UNION() tests whether a vfsmount is a union. Note that a directory in a union mounted file system is not necessarily unioned. Use IS_DIR_UNIONED() to test that.
Original-author: Jan Blunck <jblunck@suse.de> Signed-off-by: David Howells <dhowells@redhat.com> ---
fs/union.h | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/fs/union.h b/fs/union.h index e918a04..990dd16 100644 --- a/fs/union.h +++ b/fs/union.h @@ -51,6 +51,11 @@ struct union_stack { struct path u_dirs[0]; }; +static inline bool IS_MNT_UNION(struct vfsmount *mnt) +{ + return mnt->mnt_flags & MNT_UNION; +} + static inline bool IS_DIR_UNIONED(struct dentry *dentry) { return !!dentry->d_union_stack; @@ -77,6 +82,7 @@ struct path *union_find_dir(struct dentry *dentry, unsigned int layer) return NULL; } +static inline bool IS_MNT_UNION(struct vfsmount *mnt) { return false; } static inline bool IS_DIR_UNIONED(struct dentry *dentry) { return false; } static inline void d_free_unions(struct dentry *dentry) {}
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