Andriy Gapon 3385c74539 MFV r319950: 5220 L2ARC does not support devices that do not provide 512B access ... FreeBSD note: the actual change has been in FreeBSD since r297848. This commit accounts for integration of that change with subsequent changes, especially r320156 (MFV of r318946) and r314274. illumos/illumos-gate@403a8da73c 403a8da73c https://www.illumos.org/issues/5220 There are disk devices that have logical sector size larger than 512B, for example 4KB. That is, their physical sector size is larger than 512B and they do not provide emulation for 512B sector sizes. For such devices both a data offset and a data size must be properly aligned. L2ARC should arrange that because it uses physical I/O. zio_vdev_io_start() performs a necessary transformation if io_size is not aligned to vdev_ashift, but that is done only for logical I/O. Something similar should be done in L2ARC code. * a temporary write buffer should be allocated if the original buffer is not going to be compressed and its size is not aligned * size of a temporary compression buffer should be ashift aligned * for the reads, if a size of a target buffer is not sufficiently large and it is not aligned then a temporary read buffer should be allocated Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Dan Kimmel <dan.kimmel@delphix.com> Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com> Approved by: Dan McDonald <danmcd@joyent.com> Author: Andriy Gapon <avg@FreeBSD.org> MFC after: 3 weeks		2017-06-22 17:10:34 +00:00
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common	MFV r318946: 8021 ARC buf data scatter-ization	2017-06-20 17:39:24 +00:00
uts	MFV r319950: 5220 L2ARC does not support devices that do not provide 512B access	2017-06-22 17:10:34 +00:00
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