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authorTejun Heo <tj@kernel.org>2014-05-13 12:16:21 -0400
committerTejun Heo <tj@kernel.org>2014-05-13 12:16:21 -0400
commit451af504df0c62f695a69b83c250486e77c66378 (patch)
treef89879cf3f88e9da346d8bd3fa1ae192a280d772 /net/core/netprio_cgroup.c
parentb41686401e501430ffe93b575ef7959d2ecc6f2e (diff)
downloadlinux-451af504df0c62f695a69b83c250486e77c66378.tar.bz2
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 <tj@kernel.org> Acked-by: Aristeu Rozanski <arozansk@redhat.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: "David S. Miller" <davem@davemloft.net>
Diffstat (limited to 'net/core/netprio_cgroup.c')
-rw-r--r--net/core/netprio_cgroup.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 3825f669147b..b990cefd906b 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -185,15 +185,15 @@ static int read_priomap(struct seq_file *sf, void *v)
return 0;
}
-static int write_priomap(struct cgroup_subsys_state *css, struct cftype *cft,
- char *buffer)
+static ssize_t write_priomap(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
{
char devname[IFNAMSIZ + 1];
struct net_device *dev;
u32 prio;
int ret;
- if (sscanf(buffer, "%"__stringify(IFNAMSIZ)"s %u", devname, &prio) != 2)
+ if (sscanf(buf, "%"__stringify(IFNAMSIZ)"s %u", devname, &prio) != 2)
return -EINVAL;
dev = dev_get_by_name(&init_net, devname);
@@ -202,11 +202,11 @@ static int write_priomap(struct cgroup_subsys_state *css, struct cftype *cft,
rtnl_lock();
- ret = netprio_set_prio(css, dev, prio);
+ ret = netprio_set_prio(of_css(of), dev, prio);
rtnl_unlock();
dev_put(dev);
- return ret;
+ return ret ?: nbytes;
}
static int update_netprio(const void *v, struct file *file, unsigned n)
@@ -239,7 +239,7 @@ static struct cftype ss_files[] = {
{
.name = "ifpriomap",
.seq_show = read_priomap,
- .write_string = write_priomap,
+ .write = write_priomap,
},
{ } /* terminate */
};