linux-kernel - Re: [PATCH 0/3] Fadvise: Directory level page cache cleaning support

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Date:	Mon, 30 Dec 2013 11:18:15 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Li Wang <liwang@...ntukylin.com>,
	Alexander Viro <viro@...iv.linux.org.uk>
CC:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Zefan Li <lizefan@...wei.com>, Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH 0/3] Fadvise: Directory level page cache cleaning support

On 12/30/2013 05:45 AM, Li Wang wrote:
> This patch extends 'fadvise' to support directory level page cache
> cleaning. The call to posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) 
> with 'fd' referring to a directory will recursively reclaim page cache 
> entries of files inside 'fd'. For secruity concern, those inodes
> which the caller does not own appropriate permissions will not 
> be manipulated.

Why is this necessary to do in the kernel?  Why not leave it to
userspace to walk the filesystem(s)?


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