linux-kernel - [PATCH 15/15] VFS: Make pathwalk use d_is_reg() rather than S

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Date:	Wed, 25 Mar 2015 14:45:53 +0000
From:	David Howells <dhowells@...hat.com>
To:	viro@....linux.org.uk
Cc:	dhowells@...hat.com, linux-unionfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu
Subject: [PATCH 15/15] VFS: Make pathwalk use d_is_reg() rather than
 S_ISREG()

Make pathwalk use d_is_reg() rather than S_ISREG() to determine whether to
honour O_TRUNC.  Since this occurs after complete_walk(), the dentry type
field cannot change and the inode pointer cannot change as we hold a ref on
the dentry, so this should be safe.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/namei.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index 66234b836360..5a8dee5c333e 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3079,7 +3079,7 @@ finish_open:
 	error = -ENOTDIR;
 	if ((nd->flags & LOOKUP_DIRECTORY) && !d_can_lookup(nd->path.dentry))
 		goto out;
-	if (!S_ISREG(nd->inode->i_mode))
+	if (!d_is_reg(nd->path.dentry))
 		will_truncate = false;
 
 	if (will_truncate) {

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