Re: [ext4:dev 47/50] fs/ext4/extents.c:4949 ext4_ext_punch_hole() warn: inconsistent returns mutex:&inode->i_mutex: locked (4813,4815) unlocked (4806,4949)

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On Mon, 1 Oct 2012 10:50:47 +0800, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> Hi Dmitry,
> 
> FYI, there are new smatch warnings show up in
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
> head:   07043757c1a4018a04aded14deb1f28269a4b2ad
> commit: c6a59106b4106d13dc824a388c5572ddd65a0779 [47/50] ext4: punch_hole should wait for DIO writers
> 
>   arch/x86/include/asm/jump_label.h:25 arch_static_branch() info: ignoring unreachable code.
> + fs/ext4/extents.c:4949 ext4_ext_punch_hole() warn: inconsistent returns mutex:&inode->i_mutex: locked (4813,4815) unlocked (4806,4949)
Yes, that is correct, my bad. Sorry, patch attached
BTW  What tool(compile option) you use to catch this issue?

> 
> vim +4949 fs/ext4/extents.c
> 
> c6a59106 (Dmitry Monakhov   2012-09-29  4808) 
> c6a59106 (Dmitry Monakhov   2012-09-29  4809) 	mutex_lock(&inode->i_mutex);
> c6a59106 (Dmitry Monakhov   2012-09-29  4810) 	/* Need recheck file flags under mutex */
> c6a59106 (Dmitry Monakhov   2012-09-29  4811) 	/* It's not possible punch hole on append only file */
> c6a59106 (Dmitry Monakhov   2012-09-29  4812) 	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
> c6a59106 (Dmitry Monakhov   2012-09-29  4813) 		return -EPERM;
                                                               ^^^^^^^^^^^^^^^^
> c6a59106 (Dmitry Monakhov   2012-09-29  4814) 	if (IS_SWAPFILE(inode))
> c6a59106 (Dmitry Monakhov   2012-09-29  4815) 		return -ETXTBSY;
                                                               ^^^^^^^^^^^^^^^^^^
> c6a59106 (Dmitry Monakhov   2012-09-29  4816) 
> 2be4751b (Allison Henderson 2011-09-03  4817) 	/* No need to punch hole beyond i_size */
> 2be4751b (Allison Henderson 2011-09-03  4818) 	if (offset >= inode->i_size)
> c6a59106 (Dmitry Monakhov   2012-09-29  4819) 		goto out_mutex;
> 2be4751b (Allison Henderson 2011-09-03  4820) 
>From 6cf5cfc5db6c792c76c68bdbc765b733b5ad5488 Mon Sep 17 00:00:00 2001
From: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
Date: Mon, 1 Oct 2012 07:09:49 +0400
Subject: [PATCH] ext4: ext4_ext_punch_hole put i_mutex on error

Fix mistypo introduced in 'ext4: punch_hole should wait for DIO writers' patch.

Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
---
 fs/ext4/extents.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f02ffce..0a720d4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4811,10 +4811,14 @@ int ext4_ext_punch_hole(struct file *file, loff_t offset, loff_t length)
 	mutex_lock(&inode->i_mutex);
 	/* Need recheck file flags under mutex */
 	/* It's not possible punch hole on append only file */
-	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-		return -EPERM;
-	if (IS_SWAPFILE(inode))
-		return -ETXTBSY;
+	if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
+		err = -EPERM;
+		goto out_mutex;
+	}
+	if (IS_SWAPFILE(inode)) {
+		err = -ETXTBSY;
+		goto out_mutex;
+	}
 
 	/* No need to punch hole beyond i_size */
 	if (offset >= inode->i_size)
-- 
1.7.7.6


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