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block: inherit the zoned characteristics in blk_stack_limits

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Lift the code from device mapper into blk_stack_limits to inherity
the stacking limitations.  This ensures we do the right thing for
all stacked zoned block devices.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-07-20 08:12:49 +02:00 committed by Jens Axboe
parent 4f43d64807
commit 3093a47972
3 changed files with 7 additions and 22 deletions
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1
block/blk-settings.c
View File

@ -609,6 +609,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->chunk_sectors = min_not_zero(t->chunk_sectors,
b->chunk_sectors);
t->zoned = max(t->zoned, b->zoned);
return ret;
}
EXPORT_SYMBOL(blk_stack_limits);

19
drivers/md/dm-table.c
View File

@ -467,9 +467,6 @@ static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
q->limits.logical_block_size,
q->limits.alignment_offset,
(unsigned long long) start << SECTOR_SHIFT);
limits->zoned = blk_queue_zoned_model(q);
return 0;
}
@ -1528,22 +1525,6 @@ combine_limits:
dm_device_name(table->md),
(unsigned long long) ti->begin,
(unsigned long long) ti->len);
/*
* FIXME: this should likely be moved to blk_stack_limits(), would
* also eliminate limits->zoned stacking hack in dm_set_device_limits()
*/
if (limits->zoned == BLK_ZONED_NONE && ti_limits.zoned != BLK_ZONED_NONE) {
/*
* By default, the stacked limits zoned model is set to
* BLK_ZONED_NONE in blk_set_stacking_limits(). Update
* this model using the first target model reported
* that is not BLK_ZONED_NONE. This will be either the
* first target device zoned model or the model reported
* by the target .io_hints.
*/
limits->zoned = ti_limits.zoned;
}
}
/*

9
include/linux/blkdev.h
View File

@ -306,11 +306,14 @@ enum blk_queue_state {
/*
* Zoned block device models (zoned limit).
*
* Note: This needs to be ordered from the least to the most severe
* restrictions for the inheritance in blk_stack_limits() to work.
*/
enum blk_zoned_model {
BLK_ZONED_NONE, /* Regular block device */
BLK_ZONED_HA, /* Host-aware zoned block device */
BLK_ZONED_HM, /* Host-managed zoned block device */
BLK_ZONED_NONE = 0, /* Regular block device */
BLK_ZONED_HA, /* Host-aware zoned block device */
BLK_ZONED_HM, /* Host-managed zoned block device */
};
struct queue_limits {