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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/fs/lockd/procfs.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/fs/lockd/procfs.c')
-rw-r--r--kernel/fs/lockd/procfs.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/kernel/fs/lockd/procfs.c b/kernel/fs/lockd/procfs.c
new file mode 100644
index 000000000..2a0a98480
--- /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);
+}