From: Mateusz Guzik <mjguzik@gmail.com>
Date: Wed, 5 Nov 2025 21:20:24 +0000 (+0100)
Subject: fs: add iput_not_last()
X-Git-Tag: v6.18-rc7~32^2^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=12741624645e098b2234a5ae341045a97473caf1;p=thirdparty%2Flinux.git

fs: add iput_not_last()

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20251105212025.807549-1-mjguzik@gmail.com
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/inode.c b/fs/inode.c
index ec9339024ac36..cff1d3af0d577 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1967,6 +1967,18 @@ retry:
 }
 EXPORT_SYMBOL(iput);
 
+/**
+ *	iput_not_last	- put an inode assuming this is not the last reference
+ *	@inode: inode to put
+ */
+void iput_not_last(struct inode *inode)
+{
+	VFS_BUG_ON_INODE(atomic_read(&inode->i_count) < 2, inode);
+
+	WARN_ON(atomic_sub_return(1, &inode->i_count) == 0);
+}
+EXPORT_SYMBOL(iput_not_last);
+
 #ifdef CONFIG_BLOCK
 /**
  *	bmap	- find a block number in a file
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 249a1da8440e0..dd3b57cfadeeb 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2824,6 +2824,7 @@ extern int current_umask(void);
 
 extern void ihold(struct inode * inode);
 extern void iput(struct inode *);
+void iput_not_last(struct inode *);
 int inode_update_timestamps(struct inode *inode, int flags);
 int generic_update_time(struct inode *, int);