Messages in this thread Patch in this message | | | Date | Fri, 14 Mar 2008 12:43:49 +0300 | From | Pavel Emelyanov <> | Subject | [PATCH 1/3] Cgroups: add the trigger callback to struct cftype |
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Trigger callback can be used to receive a kick-up from the user space. The string written is ignored.
The cftype->private is used for multiplexing events.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Paul Menage <menage@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
--- include/linux/cgroup.h | 8 ++++++++ kernel/cgroup.c | 4 ++++ 2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 785a01c..2d1d151 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -243,6 +243,14 @@ struct cftype { */ int (*write_s64) (struct cgroup *cgrp, struct cftype *cft, s64 val); + /* + * trigger() callback can be used to get some kick from the + * userspace, when the actual string written is not important + * at all. The private field can be used to determine the + * kick type for multiplexing. + */ + int (*trigger)(struct cgroup *cgrp, unsigned int event); + int (*release) (struct inode *inode, struct file *file); }; diff --git a/kernel/cgroup.c b/kernel/cgroup.c index e8e8ec4..f2d8f25 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1410,6 +1410,10 @@ static ssize_t cgroup_file_write(struct file *file, const char __user *buf, return cft->write(cgrp, cft, file, buf, nbytes, ppos); if (cft->write_u64 || cft->write_s64) return cgroup_write_X64(cgrp, cft, file, buf, nbytes, ppos); + if (cft->trigger) { + int ret = cft->trigger(cgrp, (unsigned int)cft->private); + return ret ? ret : nbytes; + } return -EINVAL; } -- 1.5.3.4
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