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David Herrmann
4bb5f5d939
This patch (of 6): The i_mmap_writable field counts existing writable mappings of an address_space. To allow drivers to prevent new writable mappings, make this counter signed and prevent new writable mappings if it is negative. This is modelled after i_writecount and DENYWRITE. This will be required by the shmem-sealing infrastructure to prevent any new writable mappings after the WRITE seal has been set. In case there exists a writable mapping, this operation will fail with EBUSY. Note that we rely on the fact that iff you already own a writable mapping, you can increase the counter without using the helpers. This is the same that we do for i_writecount. Signed-off-by: David Herrmann <[email protected]> Acked-by: Hugh Dickins <[email protected]> Cc: Michael Kerrisk <[email protected]> Cc: Ryan Lortie <[email protected]> Cc: Lennart Poettering <[email protected]> Cc: Daniel Mack <[email protected]> Cc: Andy Lutomirski <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>