linux-kernel - [RFC][PATCH 07/27] lift fput() on late failures into path

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Message-Id: <20180709045417.13988-7-viro@ZenIV.linux.org.uk>
Date:   Mon,  9 Jul 2018 05:53:57 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 07/27] lift fput() on late failures into path_openat()

From: Al Viro <viro@...iv.linux.org.uk>

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index a58e00076ba1..36c2fa804e26 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3409,8 +3409,6 @@ static int do_last(struct nameidata *nd,
 	if (!error && will_truncate)
 		error = handle_truncate(file);
 out:
-	if (unlikely(error) && (*opened & FILE_OPENED))
-		fput(file);
 	if (unlikely(error > 0)) {
 		WARN_ON(1);
 		error = -EINVAL;
@@ -3488,8 +3486,6 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
 	if (file->f_mode & FMODE_OPENED)
 		*opened |= FILE_OPENED;
 	error = open_check_o_direct(file);
-	if (error)
-		fput(file);
 out2:
 	mnt_drop_write(path.mnt);
 out:
@@ -3551,20 +3547,23 @@ static struct file *path_openat(struct nameidata *nd,
 	}
 	terminate_walk(nd);
 out2:
-	if (!(opened & FILE_OPENED)) {
-		BUG_ON(!error);
-		put_filp(file);
+	if (likely(!error)) {
+		if (likely(opened & FILE_OPENED))
+			return file;
+		WARN_ON(1);
+		error = -EINVAL;
 	}
-	if (unlikely(error)) {
-		if (error == -EOPENSTALE) {
-			if (flags & LOOKUP_RCU)
-				error = -ECHILD;
-			else
-				error = -ESTALE;
-		}
-		file = ERR_PTR(error);
+	if (opened & FILE_OPENED)
+		fput(file);
+	else
+		put_filp(file);
+	if (error == -EOPENSTALE) {
+		if (flags & LOOKUP_RCU)
+			error = -ECHILD;
+		else
+			error = -ESTALE;
 	}
-	return file;
+	return ERR_PTR(error);
 }
 
 struct file *do_filp_open(int dfd, struct filename *pathname,
-- 
2.11.0