diff options
| author | Mike Christie <mchristi@redhat.com> | 2016-06-05 14:31:42 -0500 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-07 13:41:38 -0600 |
| commit | f21508211d2b16e65821abd171378fa6ece126fe (patch) | |
| tree | 4b85b32a065cf6c28ccd2ad1a2960ec6f4b67634 /include/linux/blk_types.h | |
| parent | 4e49ea4a3d276365bf7396c9b77b4d1d5923835a (diff) | |
block: add REQ_OP definitions and helpers
The following patches separate the operation (WRITE, READ, DISCARD,
etc) from the rq_flag_bits flags. This patch adds definitions for
request/bio operations (REQ_OPs) and adds request/bio accessors to
get/set the op.
In this patch the REQ_OPs match the REQ rq_flag_bits ones
for compat reasons while all the code is converted to use the
op accessors in the set. In the last patches the op will become a
number and the accessors and helpers in this patch will be dropped
or updated.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/blk_types.h')
| -rw-r--r-- | include/linux/blk_types.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 77e5d81f07aa..6e60baa583da 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -242,6 +242,30 @@ enum rq_flag_bits { #define REQ_HASHED (1ULL << __REQ_HASHED) #define REQ_MQ_INFLIGHT (1ULL << __REQ_MQ_INFLIGHT) +enum req_op { + REQ_OP_READ, + REQ_OP_WRITE = REQ_WRITE, + REQ_OP_DISCARD = REQ_DISCARD, + REQ_OP_WRITE_SAME = REQ_WRITE_SAME, +}; + +/* + * tmp cpmpat. Users used to set the write bit for all non reads, but + * we will be dropping the bitmap use for ops. Support both until + * the end of the patchset. + */ +static inline int op_from_rq_bits(u64 flags) +{ + if (flags & REQ_OP_DISCARD) + return REQ_OP_DISCARD; + else if (flags & REQ_OP_WRITE_SAME) + return REQ_OP_WRITE_SAME; + else if (flags & REQ_OP_WRITE) + return REQ_OP_WRITE; + else + return REQ_OP_READ; +} + typedef unsigned int blk_qc_t; #define BLK_QC_T_NONE -1U #define BLK_QC_T_SHIFT 16 |