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block: add REQ_DRV bit 

Set aside a bit in the request/bio flags for driver use.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 96222bcc73)
pull/10/head
Christoph Hellwig 2017-11-02 21:29:49 +03:00 committed by Jason Liu
parent dcd5bfb860
commit 8d78697293
1 changed files with 5 additions and 0 deletions
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5
include/linux/blk_types.h
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@ -234,6 +234,9 @@ enum req_flag_bits {
/* command specific flags for REQ_OP_WRITE_ZEROES: */
__REQ_NOUNMAP, /* do not free blocks when zeroing */
/* for driver use */
__REQ_DRV,
__REQ_NR_BITS, /* stops here */
};
@ -254,6 +257,8 @@ enum req_flag_bits {
#define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP)
#define REQ_DRV (1ULL << __REQ_DRV)
#define REQ_FAILFAST_MASK \
(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)