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| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2020-02-28 17:51:48 +0300 |
|---|---|---|
| committer | Song Liu <songliubraving@fb.com> | 2020-03-17 20:53:07 +0300 |
| commit | e74d93e96d721c4297f2a900ad0191890d2fc2b0 (patch) | |
| tree | 51449cebc1f1a08d85f350bb1bc053a62efc6bd3 /block | |
| parent | 6b40bec3b13278d21fa6c1ae7a0bdf2e550eed5f (diff) | |
| download | linux-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.c | 3 |
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); |