From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH 2/2] ext4: Fix mmap data corruption when blocksize < pagesize Date: Wed, 24 Sep 2014 10:45:19 +0200 Message-ID: <20140924084519.GA21987@quack.suse.cz> References: <1411484603-17756-1-git-send-email-jack@suse.cz> <1411484603-17756-3-git-send-email-jack@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-mm@kvack.org, Dave Chinner , linux-ext4@vger.kernel.org, Ted Tso , Jan Kara , xfs@oss.sgi.com To: linux-fsdevel@vger.kernel.org Return-path: Content-Disposition: inline In-Reply-To: <1411484603-17756-3-git-send-email-jack@suse.cz> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Tue 23-09-14 17:03:23, Jan Kara wrote: > Use block_create_hole() when hole is being created in a file so that > ->page_mkwrite() will get called for the partial tail page if it is > mmaped (see the first patch in the series for details). Just out of curiosity I did a change similar to this one for ext4 to XFS and indeed it fixed generic/030 test failures for XFS with blocksize 1k. Honza PS: I forgot to CC xfs list in the original posting. You can find the VFS patch e.g. at http://www.spinics.net/lists/linux-mm/msg78976.html > Signed-off-by: Jan Kara > --- > fs/ext4/inode.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > index 3aa26e9117c4..fdcb007c2c9e 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -4536,8 +4536,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) > ext4_orphan_del(NULL, inode); > goto err_out; > } > - } else > + } else { > + loff_t old_size = inode->i_size; > + > i_size_write(inode, attr->ia_size); > + block_create_hole(inode, old_size, inode->i_size); > + } > > /* > * Blocks are going to be removed from the inode. Wait > -- > 1.8.1.4 > -- Jan Kara SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org