Brian Behlendorf f616605821 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. Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #12532		2021-09-08 09:03:13 -06:00
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linux	Linux 5.15 compat: block device readahead	2021-09-08 09:03:13 -06:00
Makefile.am	OpenZFS restructuring - move platform specific headers	2019-09-05 09:34:54 -07:00