This one is responsible for initializing the RES_CFT_MAX files
properly and register them inside the container.
The caller must provide the cgroup, the cgroup_subsys, the
RES_CFT_MAX * sizeof(cftype) chunk of zeroed memory, the
units of measure and the read and write callbacks.
Right now I made names for two units - bytes and items. Maybe
later we will add more (pages, HZ?).
In the future, if we add more res_counter files, change their
names or anything else, no caller will be affected.
Signed-off-by: Pavel Emelyanov <[EMAIL PROTECTED]>
---
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 61363ce..bee93c3 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -58,6 +58,17 @@ ssize_t res_counter_write(struct res_cou
const char __user *buf, size_t nbytes, loff_t *pos,
int (*write_strategy)(char *buf, unsigned long long *val));
+enum {
+ RES_UNITS_BYTES,
+ RES_UNITS_ITEMS,
+
+ RES_UNITS_MAX
+};
+
+int res_counter_populate(struct cgroup_subsys *ss, struct cgroup *cont,
+ struct cftype files[], int units,
+ cft_read read_fn, cft_write write_fn);
+
/*
* the field descriptors. one for each member of res_counter
*/
@@ -66,6 +77,8 @@ enum {
RES_USAGE,
RES_LIMIT,
RES_FAILCNT,
+
+ RES_CFT_MAX,
};
/*
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index d7f43cd..ae77b6e 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -10,9 +10,45 @@
#include <linux/types.h>
#include <linux/parser.h>
#include <linux/fs.h>
+#include <linux/cgroup.h>
#include <linux/res_counter.h>
#include <linux/uaccess.h>
+static char * units_names[RES_UNITS_MAX][RES_CFT_MAX] = {
+ [RES_UNITS_BYTES] = {
+ "usage_in_bytes",
+ "limit_in_bytes",
+ "failcnt",
+ },
+ [RES_UNITS_ITEMS] = {
+ "usage",
+ "limit",
+ "failcnt",
+ },
+};
+
+static void cft_init(struct cftype files[], int type, int units,
+ cft_read read_fn, cft_write write_fn)
+{
+ if (files[type].name[0] == '\0') {
+ strcpy(files[type].name, units_names[units][type]);
+ files[type].private = type;
+ files[type].read = read_fn;
+ files[type].write = write_fn;
+ }
+}
+
+int res_counter_populate(struct cgroup_subsys *ss, struct cgroup *cont,
+ struct cftype files[], int units,
+ cft_read read_fn, cft_write write_fn)
+{
+ cft_init(files, RES_USAGE, units, read_fn, NULL);
+ cft_init(files, RES_LIMIT, units, read_fn, write_fn);
+ cft_init(files, RES_FAILCNT, units, read_fn, NULL);
+
+ return cgroup_add_files(cont, ss, files, RES_CFT_MAX);
+}
+
void res_counter_init(struct res_counter *counter)
{
spin_lock_init(&counter->lock);
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