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authorCyrill Gorcunov <gorcunov@openvz.org>2014-07-16 01:54:54 +0400
committerThomas Gleixner <tglx@linutronix.de>2014-07-18 11:49:57 +0200
commit5442e9fbd7c23172a1c9bc736629cd123a9923f0 (patch)
tree3f4c91eac56dbb5556850230e0fe5801e73175ed /include/linux/timerfd.h
parent854d06d9fc350130617debdd9e9f49d1c4ba5206 (diff)
timerfd: Implement timerfd_ioctl method to restore timerfd_ctx::ticks, v3
The read() of timerfd files allows to fetch the number of timer ticks while there is no way to set it back from userspace. To restore the timer's state as it was at checkpoint moment we need a path to bring @ticks back. Initially I thought about writing ticks back via write() interface but it seems such API is somehow obscure. Instead implement timerfd_ioctl() method with TFD_IOC_SET_TICKS command which allows to adjust @ticks into non-zero value waking up the waiters. I wrapped code with CONFIG_CHECKPOINT_RESTORE which can be dropped off if there users except c/r camp appear. v2 (by akpm@): - Use define timerfd_ioctl NULL for non c/r config v3: - Use copy_from_user for @ticks fetching since not all arch support get_user for 8 byte argument Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Andrey Vagin <avagin@openvz.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christopher Covington <cov@codeaurora.org> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Vladimir Davydov <vdavydov@parallels.com> Link: http://lkml.kernel.org/r/20140715215703.285617923@openvz.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/timerfd.h')
-rw-r--r--include/linux/timerfd.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/timerfd.h b/include/linux/timerfd.h
index d3b57fa12225..bd36ce431e32 100644
--- a/include/linux/timerfd.h
+++ b/include/linux/timerfd.h
@@ -11,6 +11,9 @@
/* For O_CLOEXEC and O_NONBLOCK */
#include <linux/fcntl.h>
+/* For _IO helpers */
+#include <linux/ioctl.h>
+
/*
* CAREFUL: Check include/asm-generic/fcntl.h when defining
* new flags, since they might collide with O_* ones. We want
@@ -29,4 +32,6 @@
/* Flags for timerfd_settime. */
#define TFD_SETTIME_FLAGS (TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET)
+#define TFD_IOC_SET_TICKS _IOW('T', 0, u64)
+
#endif /* _LINUX_TIMERFD_H */