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authorMiklos Szeredi <mszeredi@suse.cz>2014-12-13 00:59:52 +0100
committerMiklos Szeredi <mszeredi@suse.cz>2014-12-13 00:59:52 +0100
commita78d9f0d5d5ca9054703376c7c23c901807ddd87 (patch)
tree956a4d1e7517b9ead6f6f101dbfc1f344bec87fd /Documentation/filesystems/overlayfs.txt
parentovl: make upperdir optional (diff)
downloadlinux-a78d9f0d5d5ca9054703376c7c23c901807ddd87.tar.xz
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ovl: support multiple lower layers
Allow "lowerdir=" option to contain multiple lower directories separated by a colon (e.g. "lowerdir=/bin:/usr/bin"). Colon characters in filenames can be escaped with a backslash. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'Documentation/filesystems/overlayfs.txt')
-rw-r--r--Documentation/filesystems/overlayfs.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt
index a27c950ece61..b37092886dcc 100644
--- a/Documentation/filesystems/overlayfs.txt
+++ b/Documentation/filesystems/overlayfs.txt
@@ -159,6 +159,18 @@ 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.
+
+
Non-standard behavior
---------------------