diff options
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 356c40d5d20..f4c4dce9558 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -829,6 +829,39 @@ enum cgroup_filetype { FILE_TASKLIST, }; +static ssize_t cgroup_write_uint(struct cgroup *cont, struct cftype *cft, + struct file *file, + const char __user *userbuf, + size_t nbytes, loff_t *unused_ppos) +{ + char buffer[64]; + int retval = 0; + u64 val; + char *end; + + if (!nbytes) + return -EINVAL; + if (nbytes >= sizeof(buffer)) + return -E2BIG; + if (copy_from_user(buffer, userbuf, nbytes)) + return -EFAULT; + + buffer[nbytes] = 0; /* nul-terminate */ + + /* strip newline if necessary */ + if (nbytes && (buffer[nbytes-1] == '\n')) + buffer[nbytes-1] = 0; + val = simple_strtoull(buffer, &end, 0); + if (*end) + return -EINVAL; + + /* Pass to subsystem */ + retval = cft->write_uint(cont, cft, val); + if (!retval) + retval = nbytes; + return retval; +} + static ssize_t cgroup_common_file_write(struct cgroup *cont, struct cftype *cft, struct file *file, @@ -886,10 +919,11 @@ static ssize_t cgroup_file_write(struct file *file, const char __user *buf, if (!cft) return -ENODEV; - if (!cft->write) - return -EINVAL; - - return cft->write(cont, cft, file, buf, nbytes, ppos); + if (cft->write) + return cft->write(cont, cft, file, buf, nbytes, ppos); + if (cft->write_uint) + return cgroup_write_uint(cont, cft, file, buf, nbytes, ppos); + return -EINVAL; } static ssize_t cgroup_read_uint(struct cgroup *cont, struct cftype *cft, |