linux-ext4 - Recovery and Journalling

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Date:	Sun, 17 Mar 2013 17:37:14 +0530
From:	Subranshu Patel <spatel.ml@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Recovery and Journalling

This question is related to recovery (fsck and xfs_repair) and journalling.

I powered off (improper shut down) the system when the IO was
undergoing on mounted EXT4 filesystem.

After that I powered on my machine and then used fsck on the unmounted
filesystem. fsck recovered it.

There are 2 things which I want to confirm:
1. Firstly fsck replays the journal for any unfinished inconsistent writes.
2. Secondly it checks/repairs the other filesystem corruption.

Correct my understanding if wrong.

Consider the above scenario for XFS as well. In XFS, i need to mount
the filesystem, and this automatically replays the journal. After this
I again unmount the filesystem and run xfs_repair.

But in EXT4, i have to run fsck mandatorily before mounting my
filesystem. Please confirm my understanding.
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