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authorChristoph Hellwig <hch@lst.de>2020-11-26 09:23:26 +0100
committerJens Axboe <axboe@kernel.dk>2020-12-01 14:53:39 -0700
commit22ae8ce8b89241c94ac00c237752c0ffa37ba5ae (patch)
treeaf6d4dfd72e76789c25c64cd1765f037d91f6b72 /drivers/scsi/mpt3sas/mpi
parent4e7b5671c6a883d94b5428e1a9c141bbd56cb2a6 (diff)
block: simplify bdev/disk lookup in blkdev_get
To simplify block device lookup and a few other upcoming areas, make sure that we always have a struct block_device available for each disk and each partition, and only find existing block devices in bdget. The only downside of this is that each device and partition uses a little more memory. 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. For blk-cgroup which wants to access a gendisk without opening it, a new blkdev_{get,put}_no_open low-level interface is added to replace the previous get_gendisk use. Note that the change to look up block device directly instead of the two step lookup using struct gendisk causes a subtile change in behavior: accessing a non-existing partition on an existing block device can now cause a call to request_module. That call is harmless, and in practice no recent system will access these nodes as they aren't created by udev and static /dev/ setups are unusual. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/scsi/mpt3sas/mpi')
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