Re: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaimand use a_ops->writepages() where possible

From: Christoph Hellwig
Date: Tue Jun 15 2010 - 12:54:42 EST

On Tue, Jun 15, 2010 at 12:49:49PM -0400, Rik van Riel wrote:
> This is already in a filesystem. Why does ->writepage get
> called a second time? Shouldn't this have a gfp_mask
> without __GFP_FS set?

Why would it? GFP_NOFS is not for all filesystem code, but only for
code where we can't re-enter the filesystem due to deadlock potential.

Except for a few filesystems that have transactions open inside
->aio_write no one uses GFP_NOFS from that path.
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