These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / net / sunrpc / debugfs.c

diff --git a/kernel/net/sunrpc/debugfs.c b/kernel/net/sunrpc/debugfs.c
index 82962f7..e7b4d93 100644 (file)
--- a/kernel/net/sunrpc/debugfs.c
+++ b/kernel/net/sunrpc/debugfs.c
@@ -10,9 +10,12 @@
 #include "netns.h"
 
 static struct dentry *topdir;
+static struct dentry *rpc_fault_dir;
 static struct dentry *rpc_clnt_dir;
 static struct dentry *rpc_xprt_dir;
 
+unsigned int rpc_inject_disconnect;
+
 struct rpc_clnt_iter {
        struct rpc_clnt *clnt;
        loff_t          pos;
@@ -257,6 +260,8 @@ rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
                debugfs_remove_recursive(xprt->debugfs);
                xprt->debugfs = NULL;
        }
+
+       atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
 }
 
 void
@@ -266,11 +271,79 @@ rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
        xprt->debugfs = NULL;
 }
 
+static int
+fault_open(struct inode *inode, struct file *filp)
+{
+       filp->private_data = kmalloc(128, GFP_KERNEL);
+       if (!filp->private_data)
+               return -ENOMEM;
+       return 0;
+}
+
+static int
+fault_release(struct inode *inode, struct file *filp)
+{
+       kfree(filp->private_data);
+       return 0;
+}
+
+static ssize_t
+fault_disconnect_read(struct file *filp, char __user *user_buf,
+                     size_t len, loff_t *offset)
+{
+       char *buffer = (char *)filp->private_data;
+       size_t size;
+
+       size = sprintf(buffer, "%u\n", rpc_inject_disconnect);
+       return simple_read_from_buffer(user_buf, len, offset, buffer, size);
+}
+
+static ssize_t
+fault_disconnect_write(struct file *filp, const char __user *user_buf,
+                      size_t len, loff_t *offset)
+{
+       char buffer[16];
+
+       if (len >= sizeof(buffer))
+               len = sizeof(buffer) - 1;
+       if (copy_from_user(buffer, user_buf, len))
+               return -EFAULT;
+       buffer[len] = '\0';
+       if (kstrtouint(buffer, 10, &rpc_inject_disconnect))
+               return -EINVAL;
+       return len;
+}
+
+static const struct file_operations fault_disconnect_fops = {
+       .owner          = THIS_MODULE,
+       .open           = fault_open,
+       .read           = fault_disconnect_read,
+       .write          = fault_disconnect_write,
+       .release        = fault_release,
+};
+
+static struct dentry *
+inject_fault_dir(struct dentry *topdir)
+{
+       struct dentry *faultdir;
+
+       faultdir = debugfs_create_dir("inject_fault", topdir);
+       if (!faultdir)
+               return NULL;
+
+       if (!debugfs_create_file("disconnect", S_IFREG | S_IRUSR, faultdir,
+                                NULL, &fault_disconnect_fops))
+               return NULL;
+
+       return faultdir;
+}
+
 void __exit
 sunrpc_debugfs_exit(void)
 {
        debugfs_remove_recursive(topdir);
        topdir = NULL;
+       rpc_fault_dir = NULL;
        rpc_clnt_dir = NULL;
        rpc_xprt_dir = NULL;
 }
@@ -282,6 +355,10 @@ sunrpc_debugfs_init(void)
        if (!topdir)
                return;
 
+       rpc_fault_dir = inject_fault_dir(topdir);
+       if (!rpc_fault_dir)
+               goto out_remove;
+
        rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
        if (!rpc_clnt_dir)
                goto out_remove;
@@ -294,5 +371,6 @@ sunrpc_debugfs_init(void)
 out_remove:
        debugfs_remove_recursive(topdir);
        topdir = NULL;
+       rpc_fault_dir = NULL;
        rpc_clnt_dir = NULL;
 }