Add a new alloc_anon_inode helper that allocates an inode on
the anon_inode file system.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
  fs/anon_inodes.c            | 15 +++++++++++++--
  include/linux/anon_inodes.h |  1 +
  2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 4745fc37014332..b6a8ea71920bc3 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c

@@ -63,7 +63,7 @@ static struct inode *anon_inode_make_secure_inode(
  	const struct qstr qname = QSTR_INIT(name, strlen(name));
  	int error;
  
-	inode = alloc_anon_inode_sb(anon_inode_mnt->mnt_sb);
+	inode = alloc_anon_inode();
  	if (IS_ERR(inode))
  		return inode;
  	inode->i_flags &= ~S_PRIVATE;

@@ -225,13 +225,24 @@ int anon_inode_getfd_secure(const char *name, const struct file_operations *fops
  }
  EXPORT_SYMBOL_GPL(anon_inode_getfd_secure);
  
+/**
+ * alloc_anon_inode - create a new anonymous inode
+ *
+ * Create an inode on the anon_inode file system and return it.
+ */
+struct inode *alloc_anon_inode(void)
+{
+	return alloc_anon_inode_sb(anon_inode_mnt->mnt_sb);
+}
+EXPORT_SYMBOL_GPL(alloc_anon_inode);
+
  static int __init anon_inode_init(void)
  {
  	anon_inode_mnt = kern_mount(&anon_inode_fs_type);
  	if (IS_ERR(anon_inode_mnt))
  		panic("anon_inode_init() kernel mount failed (%ld)\n", PTR_ERR(anon_inode_mnt));
  
-	anon_inode_inode = alloc_anon_inode_sb(anon_inode_mnt->mnt_sb);
+	anon_inode_inode = alloc_anon_inode();
  	if (IS_ERR(anon_inode_inode))
  		panic("anon_inode_init() inode allocation failed (%ld)\n", PTR_ERR(anon_inode_inode));
  

diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h
index 71881a2b6f7860..b5ae9a6eda9923 100644
--- a/include/linux/anon_inodes.h
+++ b/include/linux/anon_inodes.h

@@ -21,6 +21,7 @@ int anon_inode_getfd_secure(const char *name,
  			    const struct file_operations *fops,
  			    void *priv, int flags,
  			    const struct inode *context_inode);
+struct inode *alloc_anon_inode(void);
  
  #endif /* _LINUX_ANON_INODES_H */