Tony Hutter e860cb0200 zvol: Remove broken blk-mq optimization ... This fix removes a dubious optimization in zfs_uiomove_bvec_rq() that saved the iterator contents of a rq_for_each_segment(). This optimization allowed restoring the "saved state" from a previous rq_for_each_segment() call on the same uio so that you wouldn't need to iterate though each bvec on every zfs_uiomove_bvec_rq() call. However, if the kernel is manipulating the requests/bios/bvecs under the covers between zfs_uiomove_bvec_rq() calls, then it could result in corruption from using the "saved state". This optimization results in an unbootable system after installing an OS on a zvol with blk-mq enabled. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #15351		2023-11-06 16:47:24 -08:00
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freebsd	FreeBSD: taskq: Remove unused declaration	2023-11-06 16:46:32 -08:00
linux	zvol: Remove broken blk-mq optimization	2023-11-06 16:47:24 -08:00