ovl: allow distributed fs as lower layer

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Allow filesystems with .d_revalidate as lower layer(s), but not as upper
layer.

For local filesystems the rule was that modifications on the layers
directly while being part of the overlay results in undefined behavior.

This can easily be extended to distributed filesystems: we assume the tree
used as lower layer is static, which means ->d_revalidate() should always
return "1".  If that is not the case, return -ESTALE, don't try to work
around the modification.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

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Miklos Szeredi 2015-06-22 13:53:48 +02:00

parent a6f15d9a75

commit 7c03b5d45b

1 changed files with 88 additions and 25 deletions

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113

fs/overlayfs/super.c

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