On Mon, Oct 01, 2012 at 07:16:35AM +0400, Dmitry Monakhov wrote: > 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? Dmitry, I'm running smatch, a very powerful tool, written and maintained by Dan Carpenter. http://smatch.sourceforge.net/ Thanks, Fengguang > > > > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
