Tejun Heo 34c06254ff cgroup: fix cftype->file_offset handling ... 6f60eade24 ("cgroup: generalize obtaining the handles of and notifying cgroup files") introduced cftype->file_offset so that the handles for per-css file instances can be recorded. These handles then can be used, for example, to generate file modified notifications. Unfortunately, it made the wrong assumption that files are created once for a given css and removed on its destruction. Due to the dependencies among subsystems, a css may be hidden from userland and then later shown again. This is implemented by removing and re-creating the affected files, so the associated kernfs_node for a given cgroup file may change over time. This incorrect assumption led to the corruption of css->files lists. Reimplement cftype->file_offset handling so that cgroup_file->kn is protected by a lock and updated as files are created and destroyed. This also makes keeping them on per-cgroup list unnecessary. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: James Sedgwick <jsedgwick@fb.com> Fixes: 6f60eade24 ("cgroup: generalize obtaining the handles of and notifying cgroup files") Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Zefan Li <lizefan@huawei.com>		2015-11-16 10:58:26 -05:00
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acpi	Merge branch 'acpi-pci'	2015-11-07 01:30:10 +01:00
asm-generic	h8300 update for v4.4	2015-11-12 15:26:39 -08:00
clocksource	…
crypto	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2015-11-05 15:32:38 -08:00
drm	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2015-11-10 09:33:06 -08:00
dt-bindings	ARM: DT updates for v4.4	2015-11-10 15:06:26 -08:00
keys	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
kvm	s390: A bunch of fixes and optimizations for interrupt and time	2015-11-05 16:26:26 -08:00
linux	cgroup: fix cftype->file_offset handling	2015-11-16 10:58:26 -05:00
math-emu	…
media	[media] v4l2: add support for SDR transmitter	2015-10-20 15:40:50 -02:00
memory	…
misc	…
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-11-10 18:11:41 -08:00
pcmcia	…
ras	…
rdma	IB/core, cma: Make __attribute_const__ declarations sparse-friendly	2015-10-30 17:57:49 -04:00
rxrpc	…
scsi	scsi: use host wide tags by default	2015-11-09 17:11:57 -08:00
soc	ARM: SoC driver updates for v4.4	2015-11-10 15:00:03 -08:00
sound	ALSA: Constify ratden/ratnum constraints	2015-10-28 11:42:22 +01:00
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2015-11-13 20:04:17 -08:00
trace	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2015-11-11 09:03:01 -08:00
uapi	VFIO updates for v4.4-rc1	2015-11-13 17:05:32 -08:00
video	drm/exynos/decon5433: add support for DECON-TV	2015-11-03 11:46:37 +09:00
xen	xen/grant-table: Add an helper to iterate over a specific number of grants	2015-10-23 14:20:46 +01:00
Kbuild	…