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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/sunrpc/rpc_pipe.c
..
..
@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * net/sunrpc/rpc_pipe.c
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  *
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@@ -13,6 +14,7 @@
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 #include <linux/string.h>
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 #include <linux/pagemap.h>
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 #include <linux/mount.h>
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+#include <linux/fs_context.h>
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 #include <linux/namei.h>
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 #include <linux/fsnotify.h>
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 #include <linux/kernel.h>
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@@ -49,7 +51,7 @@
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51
 
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 int rpc_pipefs_notifier_register(struct notifier_block *nb)
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 {
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-	return blocking_notifier_chain_cond_register(&rpc_pipefs_notifier_list, nb);
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+	return blocking_notifier_chain_register(&rpc_pipefs_notifier_list, nb);
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 }
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 EXPORT_SYMBOL_GPL(rpc_pipefs_notifier_register);
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57
 
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@@ -202,16 +204,9 @@
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 }
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205
 
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 static void
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-rpc_i_callback(struct rcu_head *head)
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+rpc_free_inode(struct inode *inode)
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 {
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-	struct inode *inode = container_of(head, struct inode, i_rcu);
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 	kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
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-}
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-
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-static void
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-rpc_destroy_inode(struct inode *inode)
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-{
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-	call_rcu(&inode->i_rcu, rpc_i_callback);
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 }
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211
 
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 static int
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@@ -483,6 +478,7 @@
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 		inode->i_fop = &simple_dir_operations;
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 		inode->i_op = &simple_dir_inode_operations;
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 		inc_nlink(inode);
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+		break;
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 	default:
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 		break;
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 	}
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@@ -604,7 +600,9 @@
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600
 
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 	dget(dentry);
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 	ret = simple_rmdir(dir, dentry);
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-	d_delete(dentry);
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+	d_drop(dentry);
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+	if (!ret)
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+		fsnotify_rmdir(dir, dentry);
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 	dput(dentry);
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 	return ret;
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 }
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@@ -615,7 +613,9 @@
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613
 
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 	dget(dentry);
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 	ret = simple_unlink(dir, dentry);
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-	d_delete(dentry);
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+	d_drop(dentry);
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+	if (!ret)
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+		fsnotify_unlink(dir, dentry);
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 	dput(dentry);
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 	return ret;
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 }
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@@ -1123,7 +1123,7 @@
1123
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  */
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 static const struct super_operations s_ops = {
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 	.alloc_inode	= rpc_alloc_inode,
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-	.destroy_inode	= rpc_destroy_inode,
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+	.free_inode	= rpc_free_inode,
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 	.statfs		= simple_statfs,
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 };
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1129
 
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@@ -1266,7 +1266,7 @@
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  * that this file will be there and have a certain format.
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  */
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 static int
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-rpc_show_dummy_info(struct seq_file *m, void *v)
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+rpc_dummy_info_show(struct seq_file *m, void *v)
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 {
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 	seq_printf(m, "RPC server: %s\n", utsname()->nodename);
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 	seq_printf(m, "service: foo (1) version 0\n");
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@@ -1275,25 +1275,12 @@
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 	seq_printf(m, "port: 0\n");
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 	return 0;
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 }
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-
1279
-static int
1280
-rpc_dummy_info_open(struct inode *inode, struct file *file)
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-{
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-	return single_open(file, rpc_show_dummy_info, NULL);
1283
-}
1284
-
1285
-static const struct file_operations rpc_dummy_info_operations = {
1286
-	.owner		= THIS_MODULE,
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-	.open		= rpc_dummy_info_open,
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-	.read		= seq_read,
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-	.llseek		= seq_lseek,
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-	.release	= single_release,
1291
-};
1278
+DEFINE_SHOW_ATTRIBUTE(rpc_dummy_info);
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1279
 
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 static const struct rpc_filelist gssd_dummy_info_file[] = {
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 	[0] = {
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 		.name = "info",
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-		.i_fop = &rpc_dummy_info_operations,
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+		.i_fop = &rpc_dummy_info_fops,
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 		.mode = S_IFREG | 0400,
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 	},
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 };
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@@ -1368,11 +1355,11 @@
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 }
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1356
 
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 static int
1371
-rpc_fill_super(struct super_block *sb, void *data, int silent)
1358
+rpc_fill_super(struct super_block *sb, struct fs_context *fc)
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 {
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 	struct inode *inode;
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 	struct dentry *root, *gssd_dentry;
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-	struct net *net = get_net(sb->s_fs_info);
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+	struct net *net = sb->s_fs_info;
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 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
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 	int err;
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1365
 
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@@ -1429,12 +1416,28 @@
1429
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 }
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 EXPORT_SYMBOL_GPL(gssd_running);
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1418
 
1432
-static struct dentry *
1433
-rpc_mount(struct file_system_type *fs_type,
1434
-		int flags, const char *dev_name, void *data)
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+static int rpc_fs_get_tree(struct fs_context *fc)
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1420
 {
1436
-	struct net *net = current->nsproxy->net_ns;
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-	return mount_ns(fs_type, flags, data, net, net->user_ns, rpc_fill_super);
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+	return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns));
1422
+}
1423
+
1424
+static void rpc_fs_free_fc(struct fs_context *fc)
1425
+{
1426
+	if (fc->s_fs_info)
1427
+		put_net(fc->s_fs_info);
1428
+}
1429
+
1430
+static const struct fs_context_operations rpc_fs_context_ops = {
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+	.free		= rpc_fs_free_fc,
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+	.get_tree	= rpc_fs_get_tree,
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+};
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+
1435
+static int rpc_init_fs_context(struct fs_context *fc)
1436
+{
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+	put_user_ns(fc->user_ns);
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+	fc->user_ns = get_user_ns(fc->net_ns->user_ns);
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+	fc->ops = &rpc_fs_context_ops;
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+	return 0;
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1441
 }
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1442
 
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 static void rpc_kill_sb(struct super_block *sb)
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@@ -1462,7 +1465,7 @@
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 static struct file_system_type rpc_pipe_fs_type = {
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 	.owner		= THIS_MODULE,
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 	.name		= "rpc_pipefs",
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-	.mount		= rpc_mount,
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+	.init_fs_context = rpc_init_fs_context,
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 	.kill_sb	= rpc_kill_sb,
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 };
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 MODULE_ALIAS_FS("rpc_pipefs");
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@@ -1508,6 +1511,6 @@
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 void unregister_rpc_pipefs(void)
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 {
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1513
 	rpc_clients_notifier_unregister();
1511
-	kmem_cache_destroy(rpc_inode_cachep);
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 	unregister_filesystem(&rpc_pipe_fs_type);
1515
+	kmem_cache_destroy(rpc_inode_cachep);
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 }