Commits on Sep 2, 2021

1. Linux 5.15 compat: block device readahead …

   The 5.15 kernel moved the backing_dev_info structure out of
   the request queue structure which causes a build failure.
   
   Rather than look in the new location for the BDI we instead
   detect this upstream refactoring by the existance of either
   the blk_queue_update_readahead() or disk_update_readahead()
   functions.  In either case, there's no longer any reason to
   manually set the ra_pages value since it will be overridden
   with a reasonable default (2x the block size) when
   blk_queue_io_opt() is called.
   
   Therefore, we update the compatibility wrapper to do nothing
   for 5.9 and newer kernels.  While it's tempting to do the
   same for older kernels we want to keep the compatibility
   code to preserve the existing behavior.  Removing it would
   effectively increase the default readahead to 128k.
   
   Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

   

   behlendorf committed Sep 2, 2021
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