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-rw-r--r--Documentation/filesystems/Locking2
-rw-r--r--Documentation/filesystems/overlayfs.txt28
2 files changed, 28 insertions, 2 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 2ca3d17eee56..f91926f2f482 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -164,8 +164,6 @@ the block device inode. See there for more details.
--------------------------- file_system_type ---------------------------
prototypes:
- int (*get_sb) (struct file_system_type *, int,
- const char *, void *, struct vfsmount *);
struct dentry *(*mount) (struct file_system_type *, int,
const char *, void *);
void (*kill_sb) (struct super_block *);
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt
index a27c950ece61..6db0e5d1da07 100644
--- a/Documentation/filesystems/overlayfs.txt
+++ b/Documentation/filesystems/overlayfs.txt
@@ -159,6 +159,22 @@ overlay filesystem (though an operation on the name of the file such as
rename or unlink will of course be noticed and handled).
+Multiple lower layers
+---------------------
+
+Multiple lower layers can now be given using the the colon (":") as a
+separator character between the directory names. For example:
+
+ mount -t overlay overlay -olowerdir=/lower1:/lower2:/lower3 /merged
+
+As the example shows, "upperdir=" and "workdir=" may be omitted. In
+that case the overlay will be read-only.
+
+The specified lower directories will be stacked beginning from the
+rightmost one and going left. In the above example lower1 will be the
+top, lower2 the middle and lower3 the bottom layer.
+
+
Non-standard behavior
---------------------
@@ -196,3 +212,15 @@ Changes to the underlying filesystems while part of a mounted overlay
filesystem are not allowed. If the underlying filesystem is changed,
the behavior of the overlay is undefined, though it will not result in
a crash or deadlock.
+
+Testsuite
+---------
+
+There's testsuite developed by David Howells at:
+
+ git://git.infradead.org/users/dhowells/unionmount-testsuite.git
+
+Run as root:
+
+ # cd unionmount-testsuite
+ # ./run --ov

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