sunrpc: add an "info" file for the dummy gssd pipe (e2f0c83a) · Commits · 戴 / test

net/sunrpc/rpc_pipe.c

+49 −1

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@
		#include <linux/fsnotify.h>
		#include <linux/kernel.h>
		#include <linux/rcupdate.h>
		#include <linux/utsname.h>

		#include <asm/ioctls.h>
		#include <linux/poll.h>
		@@ -1275,6 +1276,44 @@ static const struct rpc_pipe_ops gssd_dummy_pipe_ops = {
		.downcall = dummy_downcall,
		};

		/*
		* Here we present a bogus "info" file to keep rpc.gssd happy. We don't expect
		* that it will ever use this info to handle an upcall, but rpc.gssd expects
		* that this file will be there and have a certain format.
		*/
		static int
		rpc_show_dummy_info(struct seq_file m, void v)
		{
		seq_printf(m, "RPC server: %s\n", utsname()->nodename);
		seq_printf(m, "service: foo (1) version 0\n");
		seq_printf(m, "address: 127.0.0.1\n");
		seq_printf(m, "protocol: tcp\n");
		seq_printf(m, "port: 0\n");
		return 0;
		}

		static int
		rpc_dummy_info_open(struct inode inode, struct file file)
		{
		return single_open(file, rpc_show_dummy_info, NULL);
		}

		static const struct file_operations rpc_dummy_info_operations = {
		.owner = THIS_MODULE,
		.open = rpc_dummy_info_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = single_release,
		};

		static const struct rpc_filelist gssd_dummy_info_file[] = {
		[0] = {
		.name = "info",
		.i_fop = &rpc_dummy_info_operations,
		.mode = S_IFREG \| S_IRUSR,
		},
		};

		/**
		* rpc_gssd_dummy_populate - create a dummy gssd pipe
		* @root: root of the rpc_pipefs filesystem
		@@ -1312,9 +1351,18 @@ rpc_gssd_dummy_populate(struct dentry root, struct rpc_pipe pipe_data)
		goto out;
		}

		ret = rpc_populate(clnt_dentry, gssd_dummy_info_file, 0, 1, NULL);
		if (ret) {
		__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
		pipe_dentry = ERR_PTR(ret);
		goto out;
		}

		pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
		if (IS_ERR(pipe_dentry))
		if (IS_ERR(pipe_dentry)) {
		__rpc_depopulate(clnt_dentry, gssd_dummy_info_file, 0, 1);
		__rpc_depopulate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1);
		}
		out:
		dput(clnt_dentry);
		dput(gssd_dentry);

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