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To support such I/O without the extra btrfs_io_context > allocation, turn the mirror_num argument into a pointer so that it can > be used to output the selected mirror number, and add an optional > argument that points to a btrfs_io_stripe structure, which will be > filled with a single extent if provided by the caller. In that case > the btrfs_io_context allocation can be skipped as all information for > the single device I/O is provided in the mirror_num argument and the > on-stack btrfs_io_stripe. A caller that makes use of this new > argument will be added in the next commit. > > Signed-off-by: Christoph Hellwig > Reviewed-by: Nikolay Borisov > Reviewed-by: Johannes Thumshirn > Tested-by: Nikolay Borisov > Tested-by: Johannes Thumshirn Reviewed-by: Anand Jain