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block: treat REQ_FUA and REQ_PREFLUSH as synchronous

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Instead of requiring everyone to specify the REQ_SYNC flag aѕ well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2016-11-01 07:40:08 -06:00 committed by Jens Axboe
parent 6f6b29171a
commit b685d3d65a
2 changed files with 10 additions and 4 deletions
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8
include/linux/blk_types.h
View file

@ -216,9 +216,15 @@ static inline bool op_is_write(unsigned int op)
return (op & 1);
}
/*
* Reads are always treated as synchronous, as are requests with the FUA or
* PREFLUSH flag. Other operations may be marked as synchronous using the
* REQ_SYNC flag.
*/
static inline bool op_is_sync(unsigned int op)
{
return (op & REQ_OP_MASK) == REQ_OP_READ || (op & REQ_SYNC);
return (op & REQ_OP_MASK) == REQ_OP_READ ||
(op & (REQ_SYNC | REQ_FUA | REQ_PREFLUSH));
}
typedef unsigned int blk_qc_t;

6
include/linux/fs.h
View file

@ -199,9 +199,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
#define READ_SYNC 0
#define WRITE_SYNC (REQ_SYNC | REQ_NOIDLE)
#define WRITE_ODIRECT REQ_SYNC
#define WRITE_FLUSH (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH)
#define WRITE_FUA (REQ_SYNC | REQ_NOIDLE | REQ_FUA)
#define WRITE_FLUSH_FUA (REQ_SYNC | REQ_NOIDLE | REQ_PREFLUSH | REQ_FUA)
#define WRITE_FLUSH (REQ_NOIDLE | REQ_PREFLUSH)
#define WRITE_FUA (REQ_NOIDLE | REQ_FUA)
#define WRITE_FLUSH_FUA (REQ_NOIDLE | REQ_PREFLUSH | REQ_FUA)
/*
* Attribute flags. These should be or-ed together to figure out what