linux-kernel - Re: FS-Cache: Handle pages pending storage that get evicted under OOM conditions

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Message-Id: <200912011411.12570.s.L-H@gmx.de>
Date:	Tue, 1 Dec 2009 14:11:10 +0100
From:	"Stefan Lippers-Hollmann" <s.L-H@....de>
To:	David Howells <dhowells@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	v9fs-developer@...ts.sourceforge.net,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: FS-Cache: Handle pages pending storage that get evicted under OOM conditions

Hi

On Tuesday 01 December 2009, Linux Kernel Mailing List wrote:
> Gitweb:     http://git.kernel.org/linus/201a15428bd54f83eccec8b7c64a04b8f9431204
> Commit:     201a15428bd54f83eccec8b7c64a04b8f9431204
> Parent:     e3d4d28b1c8cc7c26536a50b43d86ccd39878550
> Author:     David Howells <dhowells@...hat.com>
> AuthorDate: Thu Nov 19 18:11:35 2009 +0000
> Committer:  David Howells <dhowells@...hat.com>
> CommitDate: Thu Nov 19 18:11:35 2009 +0000
> 
>     FS-Cache: Handle pages pending storage that get evicted under OOM conditions
>     
>     Handle netfs pages that the vmscan algorithm wants to evict from the pagecache
>     under OOM conditions, but that are waiting for write to the cache.  Under these
>     conditions, vmscan calls the releasepage() function of the netfs, asking if a
>     page can be discarded.
[...]

This commit breaks compiling 9p in 2.6.32-rc8-git2:

  CC [M]  fs/9p/cache.o
fs/9p/cache.c: In function '__v9fs_fscache_release_page':
fs/9p/cache.c:346: error: 'vnode' undeclared (first use in this function)
fs/9p/cache.c:346: error: (Each undeclared identifier is reported only once
fs/9p/cache.c:346: error: for each function it appears in.)
make[2]: *** [fs/9p/cache.o] Error 1

> diff --git a/fs/9p/cache.c b/fs/9p/cache.c
> index 51c94e2..bcc5357 100644
> --- a/fs/9p/cache.c
> +++ b/fs/9p/cache.c
> @@ -343,18 +343,7 @@ int __v9fs_fscache_release_page(struct page *page, gfp_t gfp)
>  
>  	BUG_ON(!vcookie->fscache);
>  
> -	if (PageFsCache(page)) {
> -		if (fscache_check_page_write(vcookie->fscache, page)) {
> -			if (!(gfp & __GFP_WAIT))
> -				return 0;
> -			fscache_wait_on_page_write(vcookie->fscache, page);
> -		}
> -
> -		fscache_uncache_page(vcookie->fscache, page);
> -		ClearPageFsCache(page);
> -	}
> -
> -	return 1;
> +	return fscache_maybe_release_page(vnode->cache, page, gfp);
>  }
>  
[...]

Regards
	Stefan Lippers-Hollmann



9p: fix build failure introduced by 201a15428bd54f83eccec8b7c64a04b8f9431204

  CC [M]  fs/9p/cache.o
fs/9p/cache.c: In function '__v9fs_fscache_release_page':
fs/9p/cache.c:346: error: 'vnode' undeclared (first use in this function)
fs/9p/cache.c:346: error: (Each undeclared identifier is reported only once
fs/9p/cache.c:346: error: for each function it appears in.)
make[2]: *** [fs/9p/cache.o] Error 1

Signed-off-by: Stefan Lippers-Hollmann <s.l-h@....de>
---
build tested only.

 fs/9p/cache.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/9p/cache.c b/fs/9p/cache.c
index bcc5357..e777961 100644
--- a/fs/9p/cache.c
+++ b/fs/9p/cache.c
@@ -343,7 +343,7 @@ int __v9fs_fscache_release_page(struct page *page, gfp_t gfp)
 
 	BUG_ON(!vcookie->fscache);
 
-	return fscache_maybe_release_page(vnode->cache, page, gfp);
+	return fscache_maybe_release_page(vcookie->fscache, page, gfp);
 }
 
 void __v9fs_fscache_invalidate_page(struct page *page)
--
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