cgroup files: remove cpuset_common_file_write()

This patch tweaks the signatures of the update_cpumask() and
update_nodemask() functions so that they can be called directly as
handlers for the new cgroups write_string() method.

This allows cpuset_common_file_write() to be removed.

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>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index d573891..276ce7e 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -227,10 +227,6 @@ static struct cpuset top_cpuset = {
  * The task_struct fields mems_allowed and mems_generation may only
  * be accessed in the context of that task, so require no locks.
  *
- * The cpuset_common_file_write handler for operations that modify
- * the cpuset hierarchy holds cgroup_mutex across the entire operation,
- * single threading all such cpuset modifications across the system.
- *
  * The cpuset_common_file_read() handlers only hold callback_mutex across
  * small pieces of code, such as when reading out possibly multi-word
  * cpumasks and nodemasks.
@@ -772,7 +768,7 @@ static void cpuset_change_cpumask(struct task_struct *tsk,
  * @cs: the cpuset to consider
  * @buf: buffer of cpu numbers written to this cpuset
  */
-static int update_cpumask(struct cpuset *cs, char *buf)
+static int update_cpumask(struct cpuset *cs, const char *buf)
 {
        struct cpuset trialcs;
        struct cgroup_scanner scan;
@@ -792,7 +788,6 @@ static int update_cpumask(struct cpuset *cs, char *buf)
         * that parsing.  The validate_change() call ensures that cpusets
         * with tasks have cpus.
         */
-       buf = strstrip(buf);
        if (!*buf) {
                cpus_clear(trialcs.cpus_allowed);
        } else {
@@ -902,7 +897,7 @@ static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
 
 static void *cpuset_being_rebound;
 
-static int update_nodemask(struct cpuset *cs, char *buf)
+static int update_nodemask(struct cpuset *cs, const char *buf)
 {
        struct cpuset trialcs;
        nodemask_t oldmem;
@@ -929,7 +924,6 @@ static int update_nodemask(struct cpuset *cs, char *buf)
         * that parsing.  The validate_change() call ensures that cpusets
         * with tasks have memory.
         */
-       buf = strstrip(buf);
        if (!*buf) {
                nodes_clear(trialcs.mems_allowed);
        } else {
@@ -1256,72 +1250,14 @@ typedef enum {
        FILE_SPREAD_SLAB,
 } cpuset_filetype_t;
 
-static ssize_t cpuset_common_file_write(struct cgroup *cont,
-                                       struct cftype *cft,
-                                       struct file *file,
-                                       const char __user *userbuf,
-                                       size_t nbytes, loff_t *unused_ppos)
-{
-       struct cpuset *cs = cgroup_cs(cont);
-       cpuset_filetype_t type = cft->private;
-       char *buffer;
-       int retval = 0;
-
-       /* Crude upper limit on largest legitimate cpulist user might write. */
-       if (nbytes > 100U + 6 * max(NR_CPUS, MAX_NUMNODES))
-               return -E2BIG;
-
-       /* +1 for nul-terminator */
-       buffer = kmalloc(nbytes + 1, GFP_KERNEL);
-       if (!buffer)
-               return -ENOMEM;
-
-       if (copy_from_user(buffer, userbuf, nbytes)) {
-               retval = -EFAULT;
-               goto out1;
-       }
-       buffer[nbytes] = 0;     /* nul-terminate */
-
-       cgroup_lock();
-
-       if (cgroup_is_removed(cont)) {
-               retval = -ENODEV;
-               goto out2;
-       }
-
-       switch (type) {
-       case FILE_CPULIST:
-               retval = update_cpumask(cs, buffer);
-               break;
-       case FILE_MEMLIST:
-               retval = update_nodemask(cs, buffer);
-               break;
-       default:
-               retval = -EINVAL;
-               goto out2;
-       }
-
-       if (retval == 0)
-               retval = nbytes;
-out2:
-       cgroup_unlock();
-out1:
-       kfree(buffer);
-       return retval;
-}
-
 static int cpuset_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
 {
        int retval = 0;
        struct cpuset *cs = cgroup_cs(cgrp);
        cpuset_filetype_t type = cft->private;
 
-       cgroup_lock();
-
-       if (cgroup_is_removed(cgrp)) {
-               cgroup_unlock();
+       if (!cgroup_lock_live_group(cgrp))
                return -ENODEV;
-       }
 
        switch (type) {
        case FILE_CPU_EXCLUSIVE:
@@ -1367,12 +1303,9 @@ static int cpuset_write_s64(struct cgroup *cgrp, struct cftype *cft, s64 val)
        struct cpuset *cs = cgroup_cs(cgrp);
        cpuset_filetype_t type = cft->private;
 
-       cgroup_lock();
-
-       if (cgroup_is_removed(cgrp)) {
-               cgroup_unlock();
+       if (!cgroup_lock_live_group(cgrp))
                return -ENODEV;
-       }
+
        switch (type) {
        case FILE_SCHED_RELAX_DOMAIN_LEVEL:
                retval = update_relax_domain_level(cs, val);
@@ -1386,6 +1319,32 @@ static int cpuset_write_s64(struct cgroup *cgrp, struct cftype *cft, s64 val)
 }
 
 /*
+ * Common handling for a write to a "cpus" or "mems" file.
+ */
+static int cpuset_write_resmask(struct cgroup *cgrp, struct cftype *cft,
+                               const char *buf)
+{
+       int retval = 0;
+
+       if (!cgroup_lock_live_group(cgrp))
+               return -ENODEV;
+
+       switch (cft->private) {
+       case FILE_CPULIST:
+               retval = update_cpumask(cgroup_cs(cgrp), buf);
+               break;
+       case FILE_MEMLIST:
+               retval = update_nodemask(cgroup_cs(cgrp), buf);
+               break;
+       default:
+               retval = -EINVAL;
+               break;
+       }
+       cgroup_unlock();
+       return retval;
+}
+
+/*
  * These ascii lists should be read in a single call, by using a user
  * buffer large enough to hold the entire map.  If read in smaller
  * chunks, there is no guarantee of atomicity.  Since the display format
@@ -1504,14 +1463,16 @@ static struct cftype files[] = {
        {
                .name = "cpus",
                .read = cpuset_common_file_read,
-               .write = cpuset_common_file_write,
+               .write_string = cpuset_write_resmask,
+               .max_write_len = (100U + 6 * NR_CPUS),
                .private = FILE_CPULIST,
        },
 
        {
                .name = "mems",
                .read = cpuset_common_file_read,
-               .write = cpuset_common_file_write,
+               .write_string = cpuset_write_resmask,
+               .max_write_len = (100U + 6 * MAX_NUMNODES),
                .private = FILE_MEMLIST,
        },