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ovl: support multiple lower layers

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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>
This commit is contained in:
Miklos Szeredi
2014-12-13 00:59:52 +01:00
parent 53a08cb9b8
commit a78d9f0d5d
2 changed files with 95 additions and 27 deletions
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12
Documentation/filesystems/overlayfs.txt
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@@ -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
---------------------