linux-kernel - [PATCH 3.4 085/214] VFS: make vfs_fstat() use f[get|put]

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Message-Id: <20140605041651.016653955@linuxfoundation.org>
Date:	Wed,  4 Jun 2014 21:17:28 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rui Xiang <rui.xiang@...wei.com>
Subject: [PATCH 3.4 085/214] VFS: make vfs_fstat() use f[get|put]_light()

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit e994defb7b6813ba6fa7a2a36e86d2455ad1dc35 upstream.

Use the *_light() versions that properly avoid doing the file user count
updates when they are unnecessary.

Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[xr: Backported to 3.4: adjust function name]
Signed-off-by: Rui Xiang <rui.xiang@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/stat.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/stat.c
+++ b/fs/stat.c
@@ -57,12 +57,13 @@ EXPORT_SYMBOL(vfs_getattr);
 
 int vfs_fstat(unsigned int fd, struct kstat *stat)
 {
-	struct file *f = fget_raw(fd);
+	int fput_needed;
+	struct file *f = fget_light(fd, &fput_needed);
 	int error = -EBADF;
 
 	if (f) {
 		error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
-		fput(f);
+		fput_light(f, fput_needed);
 	}
 	return error;
 }


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