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Diffstat (limited to 'kernel/cgroup/cpuset.c')
-rw-r--r--kernel/cgroup/cpuset.c56
1 files changed, 42 insertions, 14 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 72afd55f70c6..4834c4214e9c 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -39,6 +39,7 @@
#include <linux/memory.h>
#include <linux/export.h>
#include <linux/mount.h>
+#include <linux/fs_context.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
@@ -359,25 +360,52 @@ static inline bool is_in_v2_mode(void)
* users. If someone tries to mount the "cpuset" filesystem, we
* silently switch it to mount "cgroup" instead
*/
-static struct dentry *cpuset_mount(struct file_system_type *fs_type,
- int flags, const char *unused_dev_name, void *data)
-{
- struct file_system_type *cgroup_fs = get_fs_type("cgroup");
- struct dentry *ret = ERR_PTR(-ENODEV);
- if (cgroup_fs) {
- char mountopts[] =
- "cpuset,noprefix,"
- "release_agent=/sbin/cpuset_release_agent";
- ret = cgroup_fs->mount(cgroup_fs, flags,
- unused_dev_name, mountopts);
- put_filesystem(cgroup_fs);
+static int cpuset_get_tree(struct fs_context *fc)
+{
+ struct file_system_type *cgroup_fs;
+ struct fs_context *new_fc;
+ int ret;
+
+ cgroup_fs = get_fs_type("cgroup");
+ if (!cgroup_fs)
+ return -ENODEV;
+
+ new_fc = fs_context_for_mount(cgroup_fs, fc->sb_flags);
+ if (IS_ERR(new_fc)) {
+ ret = PTR_ERR(new_fc);
+ } else {
+ static const char agent_path[] = "/sbin/cpuset_release_agent";
+ ret = vfs_parse_fs_string(new_fc, "cpuset", NULL, 0);
+ if (!ret)
+ ret = vfs_parse_fs_string(new_fc, "noprefix", NULL, 0);
+ if (!ret)
+ ret = vfs_parse_fs_string(new_fc, "release_agent",
+ agent_path, sizeof(agent_path) - 1);
+ if (!ret)
+ ret = vfs_get_tree(new_fc);
+ if (!ret) { /* steal the result */
+ fc->root = new_fc->root;
+ new_fc->root = NULL;
+ }
+ put_fs_context(new_fc);
}
+ put_filesystem(cgroup_fs);
return ret;
}
+static const struct fs_context_operations cpuset_fs_context_ops = {
+ .get_tree = cpuset_get_tree,
+};
+
+static int cpuset_init_fs_context(struct fs_context *fc)
+{
+ fc->ops = &cpuset_fs_context_ops;
+ return 0;
+}
+
static struct file_system_type cpuset_fs_type = {
- .name = "cpuset",
- .mount = cpuset_mount,
+ .name = "cpuset",
+ .init_fs_context = cpuset_init_fs_context,
};
/*