linux-ext4 - [PATCH 0/8 v3] Checkpointing fixes and cleanups

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Date:	Wed, 15 Feb 2012 19:34:06 +0100
From:	Jan Kara <jack@...e.cz>
To:	Ted Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 0/8 v3] Checkpointing fixes and cleanups

  Hello,

  this is a third round of my checkpointing fixes. The patch set is primarily
aimed at fixing filesystem corruption happening occasionally (rather rarely)
after power failure. First three patches should fix the issue. Patches 4-7 are
assorted checkpointing cleanups I've gathered when inspecting checkpointing
code. Finally patch 8 is a possible speedup of checkpoining - we can use cache
flushes happening during transaction commits for pushing the journal tail
safely. The observable speedup is disputable since jbd2_cleanup_journal_tail()
is called rather rarely (for metadata heavy load I saw about one
jbd2_cleanup_journal_tail() for about 200 commits) so the cost of additional
cache flush will be likely in the noise. But the patch is simple enough so I
send it for others to judge whether it makes sense or not.

Changes since v2:
Rewrote the code pushing log tail to fix race described by Ted.
Improved some comments

									Honza
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