RE: [PATCH 04/13] block: Restore write hint support

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> This patch partially reverts commit c75e707fe1aa ("block: remove the per-
> bio/request write hint"). The following aspects of that commit have been
> reverted:
> - Pass the struct kiocb write hint information to struct bio.
> - Pass the struct bio write hint information to struct request.
> - Do not merge requests with different write hints.
> - Passing write hint information from the VFS layer to the block layer.
> - In F2FS, initialization of bio.bi_write_hint.
> 
> The following aspects of that commit have been dropped:
> - Debugfs support for retrieving and modifying write hints.
> - md-raid, BTRFS, ext4, gfs2 and zonefs write hint support.
> - The write_hints[] array in struct request_queue.
> 
> Cc: Christoph Hellwig <hch@xxxxxx>
> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>




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