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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2020-02-28 17:51:48 +0300
committerSong Liu <songliubraving@fb.com>2020-03-17 20:53:07 +0300
commite74d93e96d721c4297f2a900ad0191890d2fc2b0 (patch)
tree51449cebc1f1a08d85f350bb1bc053a62efc6bd3 /block
parent6b40bec3b13278d21fa6c1ae7a0bdf2e550eed5f (diff)
downloadlinux-e74d93e96d721c4297f2a900ad0191890d2fc2b0.tar.xz
block: keep bdi->io_pages in sync with max_sectors_kb for stacked devices
Field bdi->io_pages added in commit 9491ae4aade6 ("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 c6d6e9b0f6b4 ("dm: do not allow readahead to limit IO size") fixed the same problem for device-mapper devices, this one fixes MD RAIDs. Fixes: 9491ae4aade6 ("mm: don't cap request size based on read-ahead setting") Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de> Reviewed-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Song Liu <songliubraving@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-settings.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c
index c8eda2e7b91e..be1dca0103a4 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -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);