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 openzfs#12532

config/kernel-blk-queue.m4

@@ -47,6 +47,44 @@ AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_BDI], [
 	])
 ])
 
+dnl #
+dnl # 5.9: added blk_queue_update_readahead(),
+dnl # 5.15: renamed to disk_update_readahead()
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE_UPDATE_READAHEAD], [
+	ZFS_LINUX_TEST_SRC([blk_queue_update_readahead], [
+		#include <linux/blkdev.h>
+	],[
+		struct request_queue q;
+		blk_queue_update_readahead(&q);
+	])
+
+	ZFS_LINUX_TEST_SRC([disk_update_readahead], [
+		#include <linux/blkdev.h>
+	],[
+		struct gendisk disk;
+		disk_update_readahead(&disk);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_UPDATE_READAHEAD], [
+	AC_MSG_CHECKING([whether blk_queue_update_readahead() exists])
+	ZFS_LINUX_TEST_RESULT([blk_queue_update_readahead], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLK_QUEUE_UPDATE_READAHEAD, 1,
+		    [blk_queue_update_readahead() exists])
+	],[
+		AC_MSG_CHECKING([whether disk_update_readahead() exists])
+		ZFS_LINUX_TEST_RESULT([disk_update_readahead], [
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_DISK_UPDATE_READAHEAD, 1,
+			    [disk_update_readahead() exists])
+		],[
+			AC_MSG_RESULT(no)
+		])
+	])
+])
+
 dnl #
 dnl # 2.6.32 API,
 dnl #   blk_queue_discard()
@@ -280,6 +318,7 @@ AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS], [
 AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE], [
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_PLUG
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_BDI
+	ZFS_AC_KERNEL_SRC_BLK_QUEUE_UPDATE_READAHEAD
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_DISCARD
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_SECURE_ERASE
 	ZFS_AC_KERNEL_SRC_BLK_QUEUE_FLAG_SET
@@ -292,6 +331,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BLK_QUEUE], [
 AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE], [
 	ZFS_AC_KERNEL_BLK_QUEUE_PLUG
 	ZFS_AC_KERNEL_BLK_QUEUE_BDI
+	ZFS_AC_KERNEL_BLK_QUEUE_UPDATE_READAHEAD
 	ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
 	ZFS_AC_KERNEL_BLK_QUEUE_SECURE_ERASE
 	ZFS_AC_KERNEL_BLK_QUEUE_FLAG_SET

include/os/linux/kernel/linux/blkdev_compat.h

@@ -92,11 +92,14 @@ blk_queue_set_write_cache(struct request_queue *q, bool wc, bool fua)
 static inline void
 blk_queue_set_read_ahead(struct request_queue *q, unsigned long ra_pages)
 {
+#if !defined(HAVE_BLK_QUEUE_UPDATE_READAHEAD) && \
+	!defined(HAVE_DISK_UPDATE_READAHEAD)
 #ifdef HAVE_BLK_QUEUE_BDI_DYNAMIC
 	q->backing_dev_info->ra_pages = ra_pages;
 #else
 	q->backing_dev_info.ra_pages = ra_pages;
 #endif
+#endif
 }
 
 #ifdef HAVE_BIO_BVEC_ITER