[PATCH 1/3] vfs: move create error && negative dentry case in lookup_open() up

[Jori Koolstra <jkoolstra@xs4all.nl>]

O_CREAT is stripped when create_error is set in lookup_open(), so when
lookup does not return an inode, the case

	if (!dentry->d_inode && (open_flag & O_CREAT))

is always skipped. We can get rid of this cognitive step by handling the
error case first.

Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>
---
 fs/namei.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 19ce43c9a6e6..447eda7cbe34 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4491,6 +4491,11 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 		}
 	}
 
+	if (unlikely(create_error) && !dentry->d_inode) {
+		error = create_error;
+		goto out_dput;
+	}
+
 	/* Negative dentry, just create the file */
 	if (!dentry->d_inode && (open_flag & O_CREAT)) {
 		/* but break the directory lease first! */
@@ -4510,10 +4515,7 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 		if (error)
 			goto out_dput;
 	}
-	if (unlikely(create_error) && !dentry->d_inode) {
-		error = create_error;
-		goto out_dput;
-	}
+
 	return dentry;
 
 out_dput:
-- 
2.55.0