mm: Handle MADV_WILLNEED through vfs_fadvise()
Currently handling of MADV_WILLNEED hint calls directly into readahead code. Handle it by calling vfs_fadvise() instead so that filesystem can use its ->fadvise() callback to acquire necessary locks or otherwise prepare for the request. Suggested-by: NAmir Goldstein <amir73il@gmail.com> Reviewed-by: NBoaz Harrosh <boazh@netapp.com> CC: stable@vger.kernel.org Signed-off-by: NJan Kara <jack@suse.cz> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
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