Commits on Apr 8, 2024

1. zvol_os: fix compile with blk-mq on Linux 4.x …

   99741bd accesses a cached blk-mq hardware context through the mq_hctx
   field of struct request. However, this field did not exist until 5.0.
   Before that, the private function blk_mq_map_queue() was used to dig it
   out of broader queue context. This commit detects this situation, and
   handles it with a poor-man's simulation of that function.
   
   Sponsored-by: Klara, Inc.
   Sponsored-by: Wasabi Technology, Inc.
   Signed-off-by: Rob Norris <rob.norris@klarasystems.com>

   

   robn committed Apr 8, 2024
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