From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Thu, 27 Feb 2020 00:16:09 +0000 (-0500)
Subject: NFS: Add a helper nfs_client_for_each_server()
X-Git-Tag: baikal/mips/sdk5.9~13920^2~58
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=84cdd34528b07b55e9afb9ec77ac6fae624c83b9;p=kernel.git

NFS: Add a helper nfs_client_for_each_server()

Add a helper nfs_client_for_each_server() to iterate through all the
filesystems that are attached to a struct nfs_client, and apply
a function to all the active ones.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index f80c47d5ff277..3b6fa9edc9b5a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -417,7 +417,9 @@ extern int __init register_nfs_fs(void);
 extern void __exit unregister_nfs_fs(void);
 extern bool nfs_sb_active(struct super_block *sb);
 extern void nfs_sb_deactive(struct super_block *sb);
-
+extern int nfs_client_for_each_server(struct nfs_client *clp,
+				      int (*fn)(struct nfs_server *, void *),
+				      void *data);
 /* io.c */
 extern void nfs_start_io_read(struct inode *inode);
 extern void nfs_end_io_read(struct inode *inode);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index dada09b391c65..eb3a854923967 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -176,6 +176,41 @@ void nfs_sb_deactive(struct super_block *sb)
 }
 EXPORT_SYMBOL_GPL(nfs_sb_deactive);
 
+static int __nfs_list_for_each_server(struct list_head *head,
+		int (*fn)(struct nfs_server *, void *),
+		void *data)
+{
+	struct nfs_server *server, *last = NULL;
+	int ret = 0;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(server, head, client_link) {
+		if (!nfs_sb_active(server->super))
+			continue;
+		rcu_read_unlock();
+		if (last)
+			nfs_sb_deactive(last->super);
+		last = server;
+		ret = fn(server, data);
+		if (ret)
+			goto out;
+		rcu_read_lock();
+	}
+	rcu_read_unlock();
+out:
+	if (last)
+		nfs_sb_deactive(last->super);
+	return ret;
+}
+
+int nfs_client_for_each_server(struct nfs_client *clp,
+		int (*fn)(struct nfs_server *, void *),
+		void *data)
+{
+	return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data);
+}
+EXPORT_SYMBOL_GPL(nfs_client_for_each_server);
+
 /*
  * Deliver file system statistics to userspace
  */