From 771eb4fe8b420bb8563863e242861e635c742bc2 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Mon, 9 Jul 2018 23:27:33 -0400
Subject: [PATCH] fs: factor out d_mark_tmpfile()
New helper for bcachefs - bcachefs doesn't want the
inode_dec_link_count() call that d_tmpfile does, it handles i_nlink on
its own atomically with other btree updates
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christian Brauner <brauner@kernel.org>
---
fs/dcache.c | 12 ++++++++++--
include/linux/dcache.h | 1 +
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 25ac74d30bff3..796e23761ba05 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3246,11 +3246,10 @@ void d_genocide(struct dentry *parent)
d_walk(parent, parent, d_genocide_kill);
}
-void d_tmpfile(struct file *file, struct inode *inode)
+void d_mark_tmpfile(struct file *file, struct inode *inode)
{
struct dentry *dentry = file->f_path.dentry;
- inode_dec_link_count(inode);
BUG_ON(dentry->d_name.name != dentry->d_iname ||
!hlist_unhashed(&dentry->d_u.d_alias) ||
!d_unlinked(dentry));
@@ -3260,6 +3259,15 @@ void d_tmpfile(struct file *file, struct inode *inode)
(unsigned long long)inode->i_ino);
spin_unlock(&dentry->d_lock);
spin_unlock(&dentry->d_parent->d_lock);
+}
+EXPORT_SYMBOL(d_mark_tmpfile);
+
+void d_tmpfile(struct file *file, struct inode *inode)
+{
+ struct dentry *dentry = file->f_path.dentry;
+
+ inode_dec_link_count(inode);
+ d_mark_tmpfile(file, inode);
d_instantiate(dentry, inode);
}
EXPORT_SYMBOL(d_tmpfile);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 6b351e009f597..3da2f0545d5d7 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -251,6 +251,7 @@ extern struct dentry * d_make_root(struct inode *);
/* <clickety>-<click> the ramfs-type tree */
extern void d_genocide(struct dentry *);
+extern void d_mark_tmpfile(struct file *, struct inode *);
extern void d_tmpfile(struct file *, struct inode *);
extern struct dentry *d_find_alias(struct inode *);
--
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