diff options
| author | Damien Le Moal <damien.lemoal@wdc.com> | 2020-11-20 10:55:18 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-12-07 17:36:04 -0700 |
| commit | ea17fd354ca8afd3e8962a77236b1a9a59262fdd (patch) | |
| tree | 57a404139c3d0ac980df9ce1af2cf5c85064ddf5 /drivers/block/null_blk.h | |
| parent | 0ec4d913ac69ec86757eec117fc2733018552aa7 (diff) | |
null_blk: Allow controlling max_hw_sectors limit
Add the module option and configfs attribute max_sectors to allow
configuring the maximum size of a command issued to a null_blk device.
This allows exercising the block layer BIO splitting with different
limits than the default BLK_SAFE_MAX_SECTORS. This is also useful for
testing the zone append write path of file systems as the max_hw_sectors
limit value is also used for the max_zone_append_sectors limit.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/null_blk.h')
| -rw-r--r-- | drivers/block/null_blk.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/block/null_blk.h b/drivers/block/null_blk.h index 63000aeeb2f3..83504f3cc9d6 100644 --- a/drivers/block/null_blk.h +++ b/drivers/block/null_blk.h @@ -85,6 +85,7 @@ struct nullb_device { unsigned int home_node; /* home node for the device */ unsigned int queue_mode; /* block interface */ unsigned int blocksize; /* block size */ + unsigned int max_sectors; /* Max sectors per command */ unsigned int irqmode; /* IRQ completion handler */ unsigned int hw_queue_depth; /* queue depth */ unsigned int index; /* index of the disk, only valid with a disk */ |