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block: keep bdi->io_pages in sync with max_sectors_kb for stacked devices

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[ Upstream commit e74d93e96d721c4297f2a900ad0191890d2fc2b0 ]

Field bdi->io_pages added in commit 9491ae4aad ("mm: don't cap request
size based on read-ahead setting") removes unneeded split of read requests.

Stacked drivers do not call blk_queue_max_hw_sectors(). Instead they set
limits of their devices by blk_set_stacking_limits() + disk_stack_limits().
Field bio->io_pages stays zero until user set max_sectors_kb via sysfs.

This patch updates io_pages after merging limits in disk_stack_limits().

Commit c6d6e9b0f6 ("dm: do not allow readahead to limit IO size") fixed
the same problem for device-mapper devices, this one fixes MD RAIDs.

Fixes: 9491ae4aad ("mm: don't cap request size based on read-ahead setting")
Reviewed-by: Paul Menzel <[email protected]>
Reviewed-by: Bob Liu <[email protected]>
Signed-off-by: Konstantin Khlebnikov <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2020-02-28 17:51:48 +03:00 • committed by Greg Kroah-Hartman
commit fd66df97dc
1 changed files with 3 additions and 0 deletions
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3
block/blk-settings.c
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@ -664,6 +664,9 @@ void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n",
top, bottom);
}
t->backing_dev_info->io_pages =
t->limits.max_sectors >> (PAGE_SHIFT - 9);
}
EXPORT_SYMBOL(disk_stack_limits);