From 451af504df0c62f695a69b83c250486e77c66378 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 13 May 2014 12:16:21 -0400 Subject: cgroup: replace cftype->write_string() with cftype->write() Convert all cftype->write_string() users to the new cftype->write() which maps directly to kernfs write operation and has full access to kernfs and cgroup contexts. The conversions are mostly mechanical. * @css and @cft are accessed using of_css() and of_cft() accessors respectively instead of being specified as arguments. * Should return @nbytes on success instead of 0. * @buf is not trimmed automatically. Trim if necessary. Note that blkcg and netprio don't need this as the parsers already handle whitespaces. cftype->write_string() has no user left after the conversions and removed. While at it, remove unnecessary local variable @p in cgroup_subtree_control_write() and stale comment about CGROUP_LOCAL_BUFFER_SIZE in cgroup_freezer.c. This patch doesn't introduce any visible behavior changes. v2: netprio was missing from conversion. Converted. Signed-off-by: Tejun Heo Acked-by: Aristeu Rozanski Acked-by: Vivek Goyal Acked-by: Li Zefan Cc: Jens Axboe Cc: Johannes Weiner Cc: Michal Hocko Cc: Neil Horman Cc: "David S. Miller" --- kernel/cpuset.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) (limited to 'kernel/cpuset.c') diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 37ca0a5c226d..2f4b08b8db24 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -1603,13 +1603,15 @@ out_unlock: /* * Common handling for a write to a "cpus" or "mems" file. */ -static int cpuset_write_resmask(struct cgroup_subsys_state *css, - struct cftype *cft, char *buf) +static ssize_t cpuset_write_resmask(struct kernfs_open_file *of, + char *buf, size_t nbytes, loff_t off) { - struct cpuset *cs = css_cs(css); + struct cpuset *cs = css_cs(of_css(of)); struct cpuset *trialcs; int retval = -ENODEV; + buf = strstrip(buf); + /* * CPU or memory hotunplug may leave @cs w/o any execution * resources, in which case the hotplug code asynchronously updates @@ -1633,7 +1635,7 @@ static int cpuset_write_resmask(struct cgroup_subsys_state *css, goto out_unlock; } - switch (cft->private) { + switch (of_cft(of)->private) { case FILE_CPULIST: retval = update_cpumask(cs, trialcs, buf); break; @@ -1648,7 +1650,7 @@ static int cpuset_write_resmask(struct cgroup_subsys_state *css, free_trial_cpuset(trialcs); out_unlock: mutex_unlock(&cpuset_mutex); - return retval; + return retval ?: nbytes; } /* @@ -1750,7 +1752,7 @@ static struct cftype files[] = { { .name = "cpus", .seq_show = cpuset_common_seq_show, - .write_string = cpuset_write_resmask, + .write = cpuset_write_resmask, .max_write_len = (100U + 6 * NR_CPUS), .private = FILE_CPULIST, }, @@ -1758,7 +1760,7 @@ static struct cftype files[] = { { .name = "mems", .seq_show = cpuset_common_seq_show, - .write_string = cpuset_write_resmask, + .write = cpuset_write_resmask, .max_write_len = (100U + 6 * MAX_NUMNODES), .private = FILE_MEMLIST, }, -- cgit v1.2.1