Messages in this thread |  | | | Date | Tue, 15 Jun 2010 12:35:46 -0400 | | From | Christoph Hellwig <> | | Subject | Re: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim and use a_ops->writepages() where possible |
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On Tue, Jun 15, 2010 at 05:30:44PM +0100, Mel Gorman wrote: > After grepping through fs/, it was only xfs and btrfs that I saw were > specfically disabling writepage from reclaim context.
ext4 doesn't specificly disable writeback from reclaim context, but in a rather convoluted way disabled basically all writeback through ->writepage. The only thing allowed is overwrites of already allocated blocks.
In addition to that reiserfs also frefuses to write back pages from reclaim context if they require a transaction, which is the case if the file was written to through mmap.
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