block: unify flags for struct bio and struct request

Remove the current bio flags and reuse the request flags for the bio, too.
This allows to more easily trace the type of I/O from the filesystem
down to the block driver.  There were two flags in the bio that were
missing in the requests:  BIO_RW_UNPLUG and BIO_RW_AHEAD.  Also I've
renamed two request flags that had a superflous RW in them.

Note that the flags are in bio.h despite having the REQ_ name - as
blkdev.h includes bio.h that is the only way to go for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 1 insertions, 65 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 3ecd28ef9ba..3fc0f590861 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -84,70 +84,6 @@ enum {
 	REQ_LB_OP_FLUSH = 0x41,		/* flush request */
 };
 
-/*
- * request type modified bits. first four bits match BIO_RW* bits, important
- */
-enum rq_flag_bits {
-	__REQ_RW,		/* not set, read. set, write */
-	__REQ_FAILFAST_DEV,	/* no driver retries of device errors */
-	__REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
-	__REQ_FAILFAST_DRIVER,	/* no driver retries of driver errors */
-	/* above flags must match BIO_RW_* */
-	__REQ_DISCARD,		/* request to discard sectors */
-	__REQ_SORTED,		/* elevator knows about this request */
-	__REQ_SOFTBARRIER,	/* may not be passed by ioscheduler */
-	__REQ_HARDBARRIER,	/* may not be passed by drive either */
-	__REQ_FUA,		/* forced unit access */
-	__REQ_NOMERGE,		/* don't touch this for merging */
-	__REQ_STARTED,		/* drive already may have started this one */
-	__REQ_DONTPREP,		/* don't call prep for this one */
-	__REQ_QUEUED,		/* uses queueing */
-	__REQ_ELVPRIV,		/* elevator private data attached */
-	__REQ_FAILED,		/* set if the request failed */
-	__REQ_QUIET,		/* don't worry about errors */
-	__REQ_PREEMPT,		/* set for "ide_preempt" requests */
-	__REQ_ORDERED_COLOR,	/* is before or after barrier */
-	__REQ_RW_SYNC,		/* request is sync (sync write or read) */
-	__REQ_ALLOCED,		/* request came from our alloc pool */
-	__REQ_RW_META,		/* metadata io request */
-	__REQ_COPY_USER,	/* contains copies of user pages */
-	__REQ_INTEGRITY,	/* integrity metadata has been remapped */
-	__REQ_NOIDLE,		/* Don't anticipate more IO after this one */
-	__REQ_IO_STAT,		/* account I/O stat */
-	__REQ_MIXED_MERGE,	/* merge of different types, fail separately */
-	__REQ_NR_BITS,		/* stops here */
-};
-
-#define REQ_RW		(1 << __REQ_RW)
-#define REQ_FAILFAST_DEV	(1 << __REQ_FAILFAST_DEV)
-#define REQ_FAILFAST_TRANSPORT	(1 << __REQ_FAILFAST_TRANSPORT)
-#define REQ_FAILFAST_DRIVER	(1 << __REQ_FAILFAST_DRIVER)
-#define REQ_DISCARD	(1 << __REQ_DISCARD)
-#define REQ_SORTED	(1 << __REQ_SORTED)
-#define REQ_SOFTBARRIER	(1 << __REQ_SOFTBARRIER)
-#define REQ_HARDBARRIER	(1 << __REQ_HARDBARRIER)
-#define REQ_FUA		(1 << __REQ_FUA)
-#define REQ_NOMERGE	(1 << __REQ_NOMERGE)
-#define REQ_STARTED	(1 << __REQ_STARTED)
-#define REQ_DONTPREP	(1 << __REQ_DONTPREP)
-#define REQ_QUEUED	(1 << __REQ_QUEUED)
-#define REQ_ELVPRIV	(1 << __REQ_ELVPRIV)
-#define REQ_FAILED	(1 << __REQ_FAILED)
-#define REQ_QUIET	(1 << __REQ_QUIET)
-#define REQ_PREEMPT	(1 << __REQ_PREEMPT)
-#define REQ_ORDERED_COLOR	(1 << __REQ_ORDERED_COLOR)
-#define REQ_RW_SYNC	(1 << __REQ_RW_SYNC)
-#define REQ_ALLOCED	(1 << __REQ_ALLOCED)
-#define REQ_RW_META	(1 << __REQ_RW_META)
-#define REQ_COPY_USER	(1 << __REQ_COPY_USER)
-#define REQ_INTEGRITY	(1 << __REQ_INTEGRITY)
-#define REQ_NOIDLE	(1 << __REQ_NOIDLE)
-#define REQ_IO_STAT	(1 << __REQ_IO_STAT)
-#define REQ_MIXED_MERGE	(1 << __REQ_MIXED_MERGE)
-
-#define REQ_FAILFAST_MASK	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \
-				 REQ_FAILFAST_DRIVER)
-
 #define BLK_MAX_CDB	16
 
 /*
@@ -631,7 +567,7 @@ enum {
  */
 static inline bool rw_is_sync(unsigned int rw_flags)
 {
-	return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC);
+	return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC);
 }
 
 static inline bool rq_is_sync(struct request *rq)