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Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c38
1 files changed, 28 insertions, 10 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b5ef0c4772f..bd6122ccc0b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1299,14 +1299,13 @@ enum cgroup_filetype {
FILE_RELEASE_AGENT,
};
-static ssize_t cgroup_write_u64(struct cgroup *cgrp, struct cftype *cft,
+static ssize_t cgroup_write_X64(struct cgroup *cgrp, 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)
@@ -1318,12 +1317,17 @@ static ssize_t cgroup_write_u64(struct cgroup *cgrp, struct cftype *cft,
buffer[nbytes] = 0; /* nul-terminate */
strstrip(buffer);
- val = simple_strtoull(buffer, &end, 0);
- if (*end)
- return -EINVAL;
-
- /* Pass to subsystem */
- retval = cft->write_u64(cgrp, cft, val);
+ if (cft->write_u64) {
+ u64 val = simple_strtoull(buffer, &end, 0);
+ if (*end)
+ return -EINVAL;
+ retval = cft->write_u64(cgrp, cft, val);
+ } else {
+ s64 val = simple_strtoll(buffer, &end, 0);
+ if (*end)
+ return -EINVAL;
+ retval = cft->write_s64(cgrp, cft, val);
+ }
if (!retval)
retval = nbytes;
return retval;
@@ -1404,8 +1408,8 @@ static ssize_t cgroup_file_write(struct file *file, const char __user *buf,
return -ENODEV;
if (cft->write)
return cft->write(cgrp, cft, file, buf, nbytes, ppos);
- if (cft->write_u64)
- return cgroup_write_u64(cgrp, cft, file, buf, nbytes, ppos);
+ if (cft->write_u64 || cft->write_s64)
+ return cgroup_write_X64(cgrp, cft, file, buf, nbytes, ppos);
return -EINVAL;
}
@@ -1421,6 +1425,18 @@ static ssize_t cgroup_read_u64(struct cgroup *cgrp, struct cftype *cft,
return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
}
+static ssize_t cgroup_read_s64(struct cgroup *cgrp, struct cftype *cft,
+ struct file *file,
+ char __user *buf, size_t nbytes,
+ loff_t *ppos)
+{
+ char tmp[64];
+ s64 val = cft->read_s64(cgrp, cft);
+ int len = sprintf(tmp, "%lld\n", (long long) val);
+
+ return simple_read_from_buffer(buf, nbytes, ppos, tmp, len);
+}
+
static ssize_t cgroup_common_file_read(struct cgroup *cgrp,
struct cftype *cft,
struct file *file,
@@ -1477,6 +1493,8 @@ static ssize_t cgroup_file_read(struct file *file, char __user *buf,
return cft->read(cgrp, cft, file, buf, nbytes, ppos);
if (cft->read_u64)
return cgroup_read_u64(cgrp, cft, file, buf, nbytes, ppos);
+ if (cft->read_s64)
+ return cgroup_read_s64(cgrp, cft, file, buf, nbytes, ppos);
return -EINVAL;
}