Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / lockd / procfs.c

diff --git a/kernel/fs/lockd/procfs.c b/kernel/fs/lockd/procfs.c
new file mode 100644 (file)
index 0000000..2a0a984
--- /dev/null
+++ b/kernel/fs/lockd/procfs.c
@@ -0,0 +1,92 @@
+/*
+ * Procfs support for lockd
+ *
+ * Copyright (c) 2014 Jeff Layton <jlayton@primarydata.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/nsproxy.h>
+#include <net/net_namespace.h>
+
+#include "netns.h"
+#include "procfs.h"
+
+/*
+ * We only allow strings that start with 'Y', 'y', or '1'.
+ */
+static ssize_t
+nlm_end_grace_write(struct file *file, const char __user *buf, size_t size,
+                   loff_t *pos)
+{
+       char *data;
+       struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
+                                          lockd_net_id);
+
+       if (size < 1)
+               return -EINVAL;
+
+       data = simple_transaction_get(file, buf, size);
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       switch(data[0]) {
+       case 'Y':
+       case 'y':
+       case '1':
+               locks_end_grace(&ln->lockd_manager);
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return size;
+}
+
+static ssize_t
+nlm_end_grace_read(struct file *file, char __user *buf, size_t size,
+                  loff_t *pos)
+{
+       struct lockd_net *ln = net_generic(current->nsproxy->net_ns,
+                                          lockd_net_id);
+       char resp[3];
+
+       resp[0] = list_empty(&ln->lockd_manager.list) ? 'Y' : 'N';
+       resp[1] = '\n';
+       resp[2] = '\0';
+
+       return simple_read_from_buffer(buf, size, pos, resp, sizeof(resp));
+}
+
+static const struct file_operations lockd_end_grace_operations = {
+       .write          = nlm_end_grace_write,
+       .read           = nlm_end_grace_read,
+       .llseek         = default_llseek,
+       .release        = simple_transaction_release,
+       .owner          = THIS_MODULE,
+};
+
+int __init
+lockd_create_procfs(void)
+{
+       struct proc_dir_entry *entry;
+
+       entry = proc_mkdir("fs/lockd", NULL);
+       if (!entry)
+               return -ENOMEM;
+       entry = proc_create("nlm_end_grace", S_IRUGO|S_IWUSR, entry,
+                                &lockd_end_grace_operations);
+       if (!entry) {
+               remove_proc_entry("fs/lockd", NULL);
+               return -ENOMEM;
+       }
+       return 0;
+}
+
+void __exit
+lockd_remove_procfs(void)
+{
+       remove_proc_entry("fs/lockd/nlm_end_grace", NULL);
+       remove_proc_entry("fs/lockd", NULL);
+}