Re: [PATCH v4 01/11] VFS: move cross device copy_file_range() check into filesystems

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On Fri, Oct 26, 2018 at 04:10:46PM -0400, Olga Kornievskaia wrote:
> From: Olga Kornievskaia <kolga@xxxxxxxxxx>
> 
> This patch makes it the responsibility of individual filesystems to
> allow or deny cross device copies.  Both NFS and CIFS have operations
> for cross-server copies, and later patches will implement this feature.
> 
> Note that as of this patch, the copy_file_range() function might be passed
> superblocks from different filesystem types. -EXDEV should be returned
> if cross device copies aren't supported, causing the VFS to fall back
> on using do_splice_direct().
> 
> Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>

Reviewed-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>



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