Annotate struct fs_struct's usage count restriction
Annotate struct fs_struct's usage count to indicate the restrictions upon it. It may not be incremented, except by clone(CLONE_FS), as this affects the check in check_unsafe_exec() in fs/exec.c. Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NHugh Dickins <hugh@veritas.com> Cc: stable@kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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