Commit 451af504 authored by Tejun Heo's avatar Tejun Heo

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarAristeu Rozanski <arozansk@redhat.com>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
Acked-by: default avatarLi 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>
parent b4168640
......@@ -1346,10 +1346,10 @@ static int tg_print_conf_uint(struct seq_file *sf, void *v)
return 0;
}
static int tg_set_conf(struct cgroup_subsys_state *css, struct cftype *cft,
const char *buf, bool is_u64)
static ssize_t tg_set_conf(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off, bool is_u64)
{
struct blkcg *blkcg = css_to_blkcg(css);
struct blkcg *blkcg = css_to_blkcg(of_css(of));
struct blkg_conf_ctx ctx;
struct throtl_grp *tg;
struct throtl_service_queue *sq;
......@@ -1368,9 +1368,9 @@ static int tg_set_conf(struct cgroup_subsys_state *css, struct cftype *cft,
ctx.v = -1;
if (is_u64)
*(u64 *)((void *)tg + cft->private) = ctx.v;
*(u64 *)((void *)tg + of_cft(of)->private) = ctx.v;
else
*(unsigned int *)((void *)tg + cft->private) = ctx.v;
*(unsigned int *)((void *)tg + of_cft(of)->private) = ctx.v;
throtl_log(&tg->service_queue,
"limit change rbps=%llu wbps=%llu riops=%u wiops=%u",
......@@ -1404,19 +1404,19 @@ static int tg_set_conf(struct cgroup_subsys_state *css, struct cftype *cft,
}
blkg_conf_finish(&ctx);
return 0;
return nbytes;
}
static int tg_set_conf_u64(struct cgroup_subsys_state *css, struct cftype *cft,
char *buf)
static ssize_t tg_set_conf_u64(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
return tg_set_conf(css, cft, buf, true);
return tg_set_conf(of, buf, nbytes, off, true);
}
static int tg_set_conf_uint(struct cgroup_subsys_state *css, struct cftype *cft,
char *buf)
static ssize_t tg_set_conf_uint(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
return tg_set_conf(css, cft, buf, false);
return tg_set_conf(of, buf, nbytes, off, false);
}
static struct cftype throtl_files[] = {
......@@ -1424,25 +1424,25 @@ static struct cftype throtl_files[] = {
.name = "throttle.read_bps_device",
.private = offsetof(struct throtl_grp, bps[READ]),
.seq_show = tg_print_conf_u64,
.write_string = tg_set_conf_u64,
.write = tg_set_conf_u64,
},
{
.name = "throttle.write_bps_device",
.private = offsetof(struct throtl_grp, bps[WRITE]),
.seq_show = tg_print_conf_u64,
.write_string = tg_set_conf_u64,
.write = tg_set_conf_u64,
},
{
.name = "throttle.read_iops_device",
.private = offsetof(struct throtl_grp, iops[READ]),
.seq_show = tg_print_conf_uint,
.write_string = tg_set_conf_uint,
.write = tg_set_conf_uint,
},
{
.name = "throttle.write_iops_device",
.private = offsetof(struct throtl_grp, iops[WRITE]),
.seq_show = tg_print_conf_uint,
.write_string = tg_set_conf_uint,
.write = tg_set_conf_uint,
},
{
.name = "throttle.io_service_bytes",
......
......@@ -1670,11 +1670,11 @@ static int cfq_print_leaf_weight(struct seq_file *sf, void *v)
return 0;
}
static int __cfqg_set_weight_device(struct cgroup_subsys_state *css,
struct cftype *cft, const char *buf,
static ssize_t __cfqg_set_weight_device(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off,
bool is_leaf_weight)
{
struct blkcg *blkcg = css_to_blkcg(css);
struct blkcg *blkcg = css_to_blkcg(of_css(of));
struct blkg_conf_ctx ctx;
struct cfq_group *cfqg;
int ret;
......@@ -1697,19 +1697,19 @@ static int __cfqg_set_weight_device(struct cgroup_subsys_state *css,
}
blkg_conf_finish(&ctx);
return ret;
return ret ?: nbytes;
}
static int cfqg_set_weight_device(struct cgroup_subsys_state *css,
struct cftype *cft, char *buf)
static ssize_t cfqg_set_weight_device(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
return __cfqg_set_weight_device(css, cft, buf, false);
return __cfqg_set_weight_device(of, buf, nbytes, off, false);
}
static int cfqg_set_leaf_weight_device(struct cgroup_subsys_state *css,
struct cftype *cft, char *buf)
static ssize_t cfqg_set_leaf_weight_device(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
return __cfqg_set_weight_device(css, cft, buf, true);
return __cfqg_set_weight_device(of, buf, nbytes, off, true);
}
static int __cfq_set_weight(struct cgroup_subsys_state *css, struct cftype *cft,
......@@ -1837,7 +1837,7 @@ static struct cftype cfq_blkcg_files[] = {
.name = "weight_device",
.flags = CFTYPE_ONLY_ON_ROOT,
.seq_show = cfqg_print_leaf_weight_device,
.write_string = cfqg_set_leaf_weight_device,
.write = cfqg_set_leaf_weight_device,
},
{
.name = "weight",
......@@ -1851,7 +1851,7 @@ static struct cftype cfq_blkcg_files[] = {
.name = "weight_device",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = cfqg_print_weight_device,
.write_string = cfqg_set_weight_device,
.write = cfqg_set_weight_device,
},
{
.name = "weight",
......@@ -1863,7 +1863,7 @@ static struct cftype cfq_blkcg_files[] = {
{
.name = "leaf_weight_device",
.seq_show = cfqg_print_leaf_weight_device,
.write_string = cfqg_set_leaf_weight_device,
.write = cfqg_set_leaf_weight_device,
},
{
.name = "leaf_weight",
......
......@@ -453,8 +453,7 @@ struct cftype {
/*
* The maximum length of string, excluding trailing nul, that can
* be passed to write_string. If < PAGE_SIZE-1, PAGE_SIZE-1 is
* assumed.
* be passed to write. If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
*/
size_t max_write_len;
......@@ -500,13 +499,6 @@ struct cftype {
int (*write_s64)(struct cgroup_subsys_state *css, struct cftype *cft,
s64 val);
/*
* write_string() is passed a nul-terminated kernelspace
* buffer of maximum length determined by max_write_len.
* Returns 0 or -ve error code.
*/
int (*write_string)(struct cgroup_subsys_state *css, struct cftype *cft,
char *buffer);
/*
* trigger() callback can be used to get some kick from the
* userspace, when the actual string written is not important
......
......@@ -1035,7 +1035,7 @@ static umode_t cgroup_file_mode(const struct cftype *cft)
mode |= S_IRUGO;
if (cft->write_u64 || cft->write_s64 || cft->write ||
cft->write_string || cft->trigger)
cft->trigger)
mode |= S_IWUSR;
return mode;
......@@ -2352,20 +2352,21 @@ static int cgroup_procs_write(struct cgroup_subsys_state *css,
return attach_task_by_pid(css->cgroup, tgid, true);
}
static int cgroup_release_agent_write(struct cgroup_subsys_state *css,
struct cftype *cft, char *buffer)
static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct cgroup_root *root = css->cgroup->root;
struct cgroup *cgrp = of_css(of)->cgroup;
struct cgroup_root *root = cgrp->root;
BUILD_BUG_ON(sizeof(root->release_agent_path) < PATH_MAX);
if (!cgroup_lock_live_group(css->cgroup))
if (!cgroup_lock_live_group(cgrp))
return -ENODEV;
spin_lock(&release_agent_path_lock);
strlcpy(root->release_agent_path, buffer,
strlcpy(root->release_agent_path, strstrip(buf),
sizeof(root->release_agent_path));
spin_unlock(&release_agent_path_lock);
mutex_unlock(&cgroup_mutex);
return 0;
return nbytes;
}
static int cgroup_release_agent_show(struct seq_file *seq, void *v)
......@@ -2530,21 +2531,22 @@ out_finish:
}
/* change the enabled child controllers for a cgroup in the default hierarchy */
static int cgroup_subtree_control_write(struct cgroup_subsys_state *dummy_css,
struct cftype *cft, char *buffer)
static ssize_t cgroup_subtree_control_write(struct kernfs_open_file *of,
char *buf, size_t nbytes,
loff_t off)
{
unsigned int enable = 0, disable = 0;
struct cgroup *cgrp = dummy_css->cgroup, *child;
struct cgroup *cgrp = of_css(of)->cgroup, *child;
struct cgroup_subsys *ss;
char *tok, *p;
char *tok;
int ssid, ret;
/*
* Parse input - space separated list of subsystem names prefixed
* with either + or -.
*/
p = buffer;
while ((tok = strsep(&p, " "))) {
buf = strstrip(buf);
while ((tok = strsep(&buf, " "))) {
if (tok[0] == '\0')
continue;
for_each_subsys(ss, ssid) {
......@@ -2692,7 +2694,7 @@ out_unlock_tree:
out_unbreak:
kernfs_unbreak_active_protection(cgrp->control_kn);
cgroup_put(cgrp);
return ret;
return ret ?: nbytes;
err_undo_css:
cgrp->child_subsys_mask &= ~enable;
......@@ -2738,9 +2740,7 @@ static ssize_t cgroup_file_write(struct kernfs_open_file *of, char *buf,
css = cgroup_css(cgrp, cft->ss);
rcu_read_unlock();
if (cft->write_string) {
ret = cft->write_string(css, cft, strstrip(buf));
} else if (cft->write_u64) {
if (cft->write_u64) {
unsigned long long v;
ret = kstrtoull(buf, 0, &v);
if (!ret)
......@@ -3984,7 +3984,7 @@ static struct cftype cgroup_base_files[] = {
.name = "cgroup.subtree_control",
.flags = CFTYPE_ONLY_ON_DFL,
.seq_show = cgroup_subtree_control_show,
.write_string = cgroup_subtree_control_write,
.write = cgroup_subtree_control_write,
},
{
.name = "cgroup.populated",
......@@ -4018,7 +4018,7 @@ static struct cftype cgroup_base_files[] = {
.name = "release_agent",
.flags = CFTYPE_INSANE | CFTYPE_ONLY_ON_ROOT,
.seq_show = cgroup_release_agent_show,
.write_string = cgroup_release_agent_write,
.write = cgroup_release_agent_write,
.max_write_len = PATH_MAX - 1,
},
{ } /* terminate */
......
......@@ -73,10 +73,6 @@ bool cgroup_freezing(struct task_struct *task)
return ret;
}
/*
* cgroups_write_string() limits the size of freezer state strings to
* CGROUP_LOCAL_BUFFER_SIZE
*/
static const char *freezer_state_strs(unsigned int state)
{
if (state & CGROUP_FROZEN)
......@@ -423,20 +419,22 @@ static void freezer_change_state(struct freezer *freezer, bool freeze)
mutex_unlock(&freezer_mutex);
}
static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft,
char *buffer)
static ssize_t freezer_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
bool freeze;
if (strcmp(buffer, freezer_state_strs(0)) == 0)
buf = strstrip(buf);
if (strcmp(buf, freezer_state_strs(0)) == 0)
freeze = false;
else if (strcmp(buffer, freezer_state_strs(CGROUP_FROZEN)) == 0)
else if (strcmp(buf, freezer_state_strs(CGROUP_FROZEN)) == 0)
freeze = true;
else
return -EINVAL;
freezer_change_state(css_freezer(css), freeze);
return 0;
freezer_change_state(css_freezer(of_css(of)), freeze);
return nbytes;
}
static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css,
......@@ -460,7 +458,7 @@ static struct cftype files[] = {
.name = "state",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = freezer_read,
.write_string = freezer_write,
.write = freezer_write,
},
{
.name = "self_freezing",
......
......@@ -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,
},
......
......@@ -253,15 +253,16 @@ static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
return res_counter_read_u64(&h_cg->hugepage[idx], name);
}
static int hugetlb_cgroup_write(struct cgroup_subsys_state *css,
struct cftype *cft, char *buffer)
static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
int idx, name, ret;
unsigned long long val;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
idx = MEMFILE_IDX(cft->private);
name = MEMFILE_ATTR(cft->private);
buf = strstrip(buf);
idx = MEMFILE_IDX(of_cft(of)->private);
name = MEMFILE_ATTR(of_cft(of)->private);
switch (name) {
case RES_LIMIT:
......@@ -271,7 +272,7 @@ static int hugetlb_cgroup_write(struct cgroup_subsys_state *css,
break;
}
/* This function does all necessary parse...reuse it */
ret = res_counter_memparse_write_strategy(buffer, &val);
ret = res_counter_memparse_write_strategy(buf, &val);
if (ret)
break;
ret = res_counter_set_limit(&h_cg->hugepage[idx], val);
......@@ -280,7 +281,7 @@ static int hugetlb_cgroup_write(struct cgroup_subsys_state *css,
ret = -EINVAL;
break;
}
return ret;
return ret ?: nbytes;
}
static int hugetlb_cgroup_reset(struct cgroup_subsys_state *css,
......@@ -331,7 +332,7 @@ static void __init __hugetlb_cgroup_file_init(int idx)
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
cft->read_u64 = hugetlb_cgroup_read_u64;
cft->write_string = hugetlb_cgroup_write;
cft->write = hugetlb_cgroup_write;
/* Add the usage file */
cft = &h->cgroup_files[1];
......
......@@ -5143,17 +5143,18 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
* The user of this function is...
* RES_LIMIT.
*/
static int mem_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
char *buffer)
static ssize_t mem_cgroup_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
enum res_type type;
int name;
unsigned long long val;
int ret;
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
buf = strstrip(buf);
type = MEMFILE_TYPE(of_cft(of)->private);
name = MEMFILE_ATTR(of_cft(of)->private);
switch (name) {
case RES_LIMIT:
......@@ -5162,7 +5163,7 @@ static int mem_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
break;
}
/* This function does all necessary parse...reuse it */
ret = res_counter_memparse_write_strategy(buffer, &val);
ret = res_counter_memparse_write_strategy(buf, &val);
if (ret)
break;
if (type == _MEM)
......@@ -5175,7 +5176,7 @@ static int mem_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
return -EINVAL;
break;
case RES_SOFT_LIMIT:
ret = res_counter_memparse_write_strategy(buffer, &val);
ret = res_counter_memparse_write_strategy(buf, &val);
if (ret)
break;
/*
......@@ -5192,7 +5193,7 @@ static int mem_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
ret = -EINVAL; /* should be BUG() ? */
break;
}
return ret;
return ret ?: nbytes;
}
static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
......@@ -5964,9 +5965,10 @@ static void memcg_event_ptable_queue_proc(struct file *file,
* Input must be in format '<event_fd> <control_fd> <args>'.
* Interpretation of args is defined by control file implementation.
*/
static int memcg_write_event_control(struct cgroup_subsys_state *css,
struct cftype *cft, char *buffer)
static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct cgroup_subsys_state *css = of_css(of);
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_event *event;
struct cgroup_subsys_state *cfile_css;
......@@ -5977,15 +5979,17 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
char *endp;
int ret;
efd = simple_strtoul(buffer, &endp, 10);
buf = strstrip(buf);
efd = simple_strtoul(buf, &endp, 10);
if (*endp != ' ')
return -EINVAL;
buffer = endp + 1;
buf = endp + 1;
cfd = simple_strtoul(buffer, &endp, 10);
cfd = simple_strtoul(buf, &endp, 10);
if ((*endp != ' ') && (*endp != '\0'))
return -EINVAL;
buffer = endp + 1;
buf = endp + 1;
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)
......@@ -6063,7 +6067,7 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
goto out_put_cfile;
}
ret = event->register_event(memcg, event->eventfd, buffer);
ret = event->register_event(memcg, event->eventfd, buf);
if (ret)
goto out_put_css;
......@@ -6076,7 +6080,7 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
fdput(cfile);
fdput(efile);
return 0;
return nbytes;
out_put_css:
css_put(css);
......@@ -6107,13 +6111,13 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_LIMIT),
.write_string = mem_cgroup_write,
.write = mem_cgroup_write,
.read_u64 = mem_cgroup_read_u64,
},
{
.name = "soft_limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT),
.write_string = mem_cgroup_write,
.write = mem_cgroup_write,
.read_u64 = mem_cgroup_read_u64,
},
{
......@@ -6138,7 +6142,7 @@ static struct cftype mem_cgroup_files[] = {
},
{
.name = "cgroup.event_control", /* XXX: for compat */
.write_string = memcg_write_event_control,
.write = memcg_write_event_control,
.flags = CFTYPE_NO_PREFIX,
.mode = S_IWUGO,
},
......@@ -6171,7 +6175,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "kmem.limit_in_bytes",
.private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
.write_string = mem_cgroup_write,
.write = mem_cgroup_write,
.read_u64 = mem_cgroup_read_u64,
},
{
......@@ -6217,7 +6221,7 @@ static struct cftype memsw_cgroup_files[] = {
{
.name = "memsw.limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT),
.write_string = mem_cgroup_write,
.write = mem_cgroup_write,
.read_u64 = mem_cgroup_read_u64,
},
{
......
......@@ -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 */
};
......
......@@ -102,17 +102,19 @@ static int tcp_update_limit(struct mem_cgroup *memcg, u64 val)
return 0;
}
static int tcp_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
char *buffer)
static ssize_t tcp_cgroup_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
unsigned long long val;
int ret = 0;
switch (cft->private) {
buf = strstrip(buf);
switch (of_cft(of)->private) {
case RES_LIMIT:
/* see memcontrol.c */
ret = res_counter_memparse_write_strategy(buffer, &val);
ret = res_counter_memparse_write_strategy(buf, &val);
if (ret)
break;
ret = tcp_update_limit(memcg, val);
......@@ -121,7 +123,7 @@ static int tcp_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
ret = -EINVAL;
break;
}
return ret;
return ret ?: nbytes;
}
static u64 tcp_read_stat(struct mem_cgroup *memcg, int type, u64 default_val)
......@@ -193,7 +195,7 @@ static int tcp_cgroup_reset(struct cgroup_subsys_state *css, unsigned int event)
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.limit_in_bytes",
.write_string = tcp_cgroup_write,
.write = tcp_cgroup_write,
.read_u64 = tcp_cgroup_read,
.private = RES_LIMIT,
},
......
......@@ -767,27 +767,27 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
return rc;
}
static int devcgroup_access_write(struct cgroup_subsys_state *css,
struct cftype *cft, char *buffer)
static ssize_t devcgroup_access_write(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
int retval;
mutex_lock(&devcgroup_mutex);
retval = devcgroup_update_access(css_to_devcgroup(css),
cft->private, buffer);
retval = devcgroup_update_access(css_to_devcgroup(of_css(of)),
of_cft(of)->private, strstrip(buf));
mutex_unlock(&devcgroup_mutex);
return retval;
return retval ?: nbytes;
}