From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pranay Kr. Srivastava" Subject: [PATCH 0/1]ext4: Fix for WARN_ON_ONCE when marking buffer dirty Date: Thu, 30 Jun 2016 14:12:29 +0300 Message-ID: <1467285150-15977-1-git-send-email-pranjas@gmail.com> Cc: "Pranay Kr. Srivastava" To: tytso@mit.edu, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org 1) Fix WARN_ON_ONCE when marking buffer dirty it's possible that a writeback for the super block buffer head is triggered after setting the buffer uptodate on a buffer write_io_error. If however there's an error while writing the buffer head then the buffer is cleared from being uptodate. If the buffer uptodate is not set while calling mark_buffer_dirty, it throws a WARN_ON_ONCE. This patch fixes it by locking the buffer while marking the buffer uptodate and then marking it dirty while holding the buffer head lock. Pranay Kr. Srivastava (5): Fix WARN_ON_ONCE when marking buffer dirty fs/ext4/super.c | 30 +++++----- 1 files changed, 16 insertions(+), 14 deletions(-) -- 1.9.1