On 11/16/20 3:57 PM, Christoph Hellwig wrote:
To simplify block device lookup and a few other upcomdin areas, make sure that we always have a struct block_device available for each disk and each partition. The only downside of this is that each device and partition uses a little more memories. The upside will be that a lot of code can be simplified. With that all we need to look up the block device is to lookup the inode and do a few sanity checks on the gendisk, instead of the separate lookup for the gendisk. As part of the change switch bdget() to only find existing block devices, given that we know that the block_device structure must be allocated at probe / partition scan time. blk-cgroup needed a bit of a special treatment as the only place that wanted to lookup a gendisk outside of the normal blkdev_get path. It is switched to lookup using the block device hash now that this is the primary lookup path. Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- block/blk-cgroup.c | 42 ++++----- block/blk-iocost.c | 36 +++---- block/blk.h | 1 - block/genhd.c | 188 +++---------------------------------- block/partitions/core.c | 28 +++--- fs/block_dev.c | 133 +++++++++++++++----------- include/linux/blk-cgroup.h | 4 +- include/linux/blkdev.h | 3 + include/linux/genhd.h | 4 +- 9 files changed, 153 insertions(+), 286 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@xxxxxxx +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
