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d7f36dc446
Allow stacked devices to support atomic writes by aggregating the minimum capability of all bottom devices. Flag BLK_FEAT_ATOMIC_WRITES_STACKED is set for stacked devices which have been enabled to support atomic writes. Some things to note on the implementation: - For simplicity, all bottom devices must have same atomic write boundary value (if any) - The atomic write boundary must be a power-of-2 already, but this restriction could be relaxed. Furthermore, it is now required that the chunk sectors for a top device must be aligned with this boundary. - If a bottom device atomic write unit min/max are not aligned with the top device chunk sectors, the top device atomic write unit min/max are reduced to a value which works for the chunk sectors. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: John Garry <john.g.garry@oracle.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20241118105018.1870052-3-john.g.garry@oracle.com Signed-off-by: Jens Axboe <axboe@kernel.dk>