kernel-fxtec-pro1x/include
David Herrmann 4bb5f5d939 mm: allow drivers to prevent new writable mappings
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 <dh.herrmann@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Ryan Lortie <desrt@desrt.ca>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08 15:57:31 -07:00
..
acpi ACPI and power management updates for 3.17-rc1 2014-08-06 20:34:19 -07:00
asm-generic pci-dma-compat: add pci_zalloc_consistent helper 2014-08-08 15:57:28 -07:00
clocksource
crypto Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2014-08-06 08:06:39 -07:00
drm
dt-bindings
keys
kvm
linux mm: allow drivers to prevent new writable mappings 2014-08-08 15:57:31 -07:00
math-emu
media
memory
misc
net net-timestamp: sock_tx_timestamp() fix 2014-08-06 12:38:07 -07:00
pcmcia
ras
rdma
rxrpc
scsi lib/scatterlist: make ARCH_HAS_SG_CHAIN an actual Kconfig 2014-08-08 15:57:26 -07:00
sound
target
trace Merge branch 'akpm' (patchbomb from Andrew Morton) 2014-08-06 21:14:42 -07:00
uapi Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2014-08-07 08:50:34 -07:00
video
xen
Kbuild