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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