tree 9da7b5eafe136c8c5b9e76e9a9cccd70899df252
parent 25736b1c692d436508585d1d710912e6f76be2d8
author Chris Mason <mason@suse.com> 1159520396 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1159546691 -0700

[PATCH] Fix reiserfs latencies caused by data=ordered

ReiserFS does periodic cleanup of old transactions in order to limit the
length of time a journal replay may take after a crash.  Sometimes, writing
metadata from an old (already committed) transaction may require committing
a newer transaction, which also requires writing all data=ordered buffers.
This can cause very long stalls on journal_begin.

This patch makes sure new transactions will not need to be committed before
trying a periodic reclaim of an old transaction.  It is low risk because if
a bad decision is made, it just means a slightly longer journal replay
after a crash.

Signed-off-by: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>