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block: Document that bio_op() uses the data type of bio.bi_opf 

Make it clear that the sizeof(unsigned int) expression in BIO_OP_SHIFT
refers to the bi_opf member of struct bio.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Bart Van Assche 2016-09-14 10:44:12 +02:00 committed by Jens Axboe
parent a441b0d093
commit 637ca77bd1
1 changed files with 1 additions and 1 deletions
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2
include/linux/blk_types.h
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@ -89,7 +89,7 @@ struct bio {
struct bio_vec bi_inline_vecs[0];
};
#define BIO_OP_SHIFT (8 * sizeof(unsigned int) - REQ_OP_BITS)
#define BIO_OP_SHIFT (8 * FIELD_SIZEOF(struct bio, bi_opf) - REQ_OP_BITS)
#define bio_op(bio) ((bio)->bi_opf >> BIO_OP_SHIFT)
#define bio_set_op_attrs(bio, op, op_flags) do { \