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cgroup files: move notify_on_release file to separate write handler
This patch moves the write handler for the cgroups notify_on_release file into a separate handler. This handler requires no cgroups locking since it relies on atomic bitops for synchronization. Signed-off-by: Paul Menage <menage@google.com> Cc: Paul Jackson <pj@sgi.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Serge Hallyn <serue@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1474,13 +1474,6 @@ static ssize_t cgroup_common_file_write(struct cgroup *cgrp,
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case FILE_TASKLIST:
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retval = attach_task_by_pid(cgrp, buffer);
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break;
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case FILE_NOTIFY_ON_RELEASE:
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clear_bit(CGRP_RELEASABLE, &cgrp->flags);
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if (simple_strtoul(buffer, NULL, 10) != 0)
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set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
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else
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clear_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
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break;
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default:
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retval = -EINVAL;
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goto out2;
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@ -2252,6 +2245,18 @@ static u64 cgroup_read_notify_on_release(struct cgroup *cgrp,
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return notify_on_release(cgrp);
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}
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static int cgroup_write_notify_on_release(struct cgroup *cgrp,
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struct cftype *cft,
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u64 val)
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{
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clear_bit(CGRP_RELEASABLE, &cgrp->flags);
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if (val)
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set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
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else
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clear_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
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return 0;
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}
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/*
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* for the common functions, 'private' gives the type of file
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*/
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@ -2268,7 +2273,7 @@ static struct cftype files[] = {
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{
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.name = "notify_on_release",
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.read_u64 = cgroup_read_notify_on_release,
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.write = cgroup_common_file_write,
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.write_u64 = cgroup_write_notify_on_release,
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.private = FILE_NOTIFY_ON_RELEASE,
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},
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};
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