linux-kernel - [PATCH 04/23] VFS: Make get_filesystem() return the affected filesystem [ver #4]

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Message-ID: <149546832259.9289.16730408042740911353.stgit@warthog.procyon.org.uk>
Date:   Mon, 22 May 2017 16:52:02 +0100
From:   David Howells <dhowells@...hat.com>
To:     mszeredi@...hat.com, viro@...iv.linux.org.uk, jlayton@...hat.com
Cc:     dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/23] VFS: Make get_filesystem() return the affected
 filesystem [ver #4]

Make get_filesystem() return a pointer to the filesystem on which it just
got a ref.

Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/filesystems.c   |    3 ++-
 include/linux/fs.h |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/filesystems.c b/fs/filesystems.c
index cac75547d35c..591e52d23ed4 100644
--- a/fs/filesystems.c
+++ b/fs/filesystems.c
@@ -33,9 +33,10 @@ static struct file_system_type *file_systems;
 static DEFINE_RWLOCK(file_systems_lock);
 
 /* WARNING: This can be used only if we _already_ own a reference */
-void get_filesystem(struct file_system_type *fs)
+struct file_system_type *get_filesystem(struct file_system_type *fs)
 {
 	__module_get(fs->owner);
+	return fs;
 }
 
 void put_filesystem(struct file_system_type *fs)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 803e5a9b2654..bc0c054894b9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2956,7 +2956,7 @@ extern int generic_block_fiemap(struct inode *inode,
 				struct fiemap_extent_info *fieinfo, u64 start,
 				u64 len, get_block_t *get_block);
 
-extern void get_filesystem(struct file_system_type *fs);
+extern struct file_system_type *get_filesystem(struct file_system_type *fs);
 extern void put_filesystem(struct file_system_type *fs);
 extern struct file_system_type *get_fs_type(const char *name);
 extern struct super_block *get_super(struct block_device *);