btrfs: remove struct rcu_string

The only use for device name has been removed so we can kill the RCU
string API.

Reviewed-by: Daniel Vacek <neelx@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

4 files changed, 0 insertions, 43 deletions

diff --git a/fs/btrfs/rcu-string.h b/fs/btrfs/rcu-string.h
deleted file mode 100644
index 70b1e19b50e6..000000000000
--- a/fs/btrfs/rcu-string.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2012 Red Hat.  All rights reserved.
- */
-
-#ifndef BTRFS_RCU_STRING_H
-#define BTRFS_RCU_STRING_H
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/rcupdate.h>
-#include <linux/printk.h>
-
-struct rcu_string {
-	struct rcu_head rcu;
-	char str[];
-};
-
-static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
-{
-	size_t len = strlen(src) + 1;
-	struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
-					 (len * sizeof(char)), mask);
-	if (!ret)
-		return ret;
-	/* Warn if the source got unexpectedly truncated. */
-	if (WARN_ON(strscpy(ret->str, src, len) < 0)) {
-		kfree(ret);
-		return NULL;
-	}
-	return ret;
-}
-
-#define rcu_str_deref(rcu_str) ({				\
-	struct rcu_string *__str = rcu_dereference(rcu_str);	\
-	__str->str;						\
-})
-
-#endif
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c026bb8b51fe..31aecd291d6c 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -18,7 +18,6 @@
 #include "transaction.h"
 #include "volumes.h"
 #include "raid56.h"
-#include "rcu-string.h"
 #include "dev-replace.h"
 #include "sysfs.h"
 #include "tree-checker.h"
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 860d1823c6e0..c2c28c71b0da 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -21,7 +21,6 @@
 #include <uapi/linux/btrfs.h>
 #include <uapi/linux/btrfs_tree.h>
 #include "messages.h"
-#include "rcu-string.h"
 #include "extent-io-tree.h"
 
 struct block_device;
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 27264db4b7ca..245e813ecd78 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -9,7 +9,6 @@
 #include "ctree.h"
 #include "volumes.h"
 #include "zoned.h"
-#include "rcu-string.h"
 #include "disk-io.h"
 #include "block-group.h"
 #include "dev-replace.h"