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54c202bbeb
commit 69c433ed2e upstream.
Add a simple read-only counter to super_block that indicates how deep this
is in the stack of filesystems. Previously ecryptfs was the only stackable
filesystem and it explicitly disallowed multiple layers of itself.
Overlayfs, however, can be stacked recursively and also may be stacked
on top of ecryptfs or vice versa.
To limit the kernel stack usage we must limit the depth of the
filesystem stack. Initially the limit is set to 2.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
[bwh: Backported to 3.16: drop changes to overlayfs]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
906 lines
25 KiB
906 lines
25 KiB