Subject: [PATCH 2/9] fs: add an argument-less alloc_anon_inode

From: Christoph Hellwig <[email-masked]>
Date: Tue, 9 Mar 2021 16:53:41 +0100

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

Signed-off-by: Christoph Hellwig <[email-masked]>
---
 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 */
 
-- 
2.30.1