block: allow specifying size for extra command data

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This mirrors the blk-mq capabilities to allocate extra drivers-specific
data behind struct request by setting a cmd_size field, as well as having
a constructor / destructor for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Christoph Hellwig 2017-01-27 09:51:45 -07:00 • committed by Jens Axboe

parent 5ea708d15a

commit 6d247d7f71

4 changed files with 61 additions and 17 deletions

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59

block/blk-core.c

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5

block/blk-flush.c

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7

block/blk-sysfs.c

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7

include/linux/blkdev.h

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