block: use the same failfast bits for bio and request

bio and request use the same set of failfast bits.  This patch makes
the following changes to simplify things.

* enumify BIO_RW* bits and reorder bits such that BIOS_RW_FAILFAST_*
  bits coincide with __REQ_FAILFAST_* bits.

* The above pushes BIO_RW_AHEAD out of sync with __REQ_FAILFAST_DEV
  but the matching is useless anyway.  init_request_from_bio() is
  responsible for setting FAILFAST bits on FS requests and non-FS
  requests never use BIO_RW_AHEAD.  Drop the code and comment from
  blk_rq_bio_prep().

* Define REQ_FAILFAST_MASK which is OR of all FAILFAST bits and
  simplify FAILFAST flags handling in init_request_from_bio().

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 23 insertions, 20 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 2892b710771c..a299ed38fcd7 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -142,37 +142,40 @@ struct bio {
  *
  * bit 0 -- data direction
  *      If not set, bio is a read from device. If set, it's a write to device.
- * bit 1 -- rw-ahead when set
- * bit 2 -- barrier
+ * bit 1 -- fail fast device errors
+ * bit 2 -- fail fast transport errors
+ * bit 3 -- fail fast driver errors
+ * bit 4 -- rw-ahead when set
+ * bit 5 -- barrier
  *      Insert a serialization point in the IO queue, forcing previously
  *      submitted IO to be completed before this one is issued.
- * bit 3 -- synchronous I/O hint.
- * bit 4 -- Unplug the device immediately after submitting this bio.
- * bit 5 -- metadata request
+ * bit 6 -- synchronous I/O hint.
+ * bit 7 -- Unplug the device immediately after submitting this bio.
+ * bit 8 -- metadata request
  *      Used for tracing to differentiate metadata and data IO. May also
  *      get some preferential treatment in the IO scheduler
- * bit 6 -- discard sectors
+ * bit 9 -- discard sectors
  *      Informs the lower level device that this range of sectors is no longer
  *      used by the file system and may thus be freed by the device. Used
  *      for flash based storage.
- * bit 7 -- fail fast device errors
- * bit 8 -- fail fast transport errors
- * bit 9 -- fail fast driver errors
  *      Don't want driver retries for any fast fail whatever the reason.
  * bit 10 -- Tell the IO scheduler not to wait for more requests after this
         one has been submitted, even if it is a SYNC request.
  */
-#define BIO_RW          0       /* Must match RW in req flags (blkdev.h) */
-#define BIO_RW_AHEAD    1       /* Must match FAILFAST in req flags */
-#define BIO_RW_BARRIER  2
-#define BIO_RW_SYNCIO   3
-#define BIO_RW_UNPLUG   4
-#define BIO_RW_META     5
-#define BIO_RW_DISCARD  6
-#define BIO_RW_FAILFAST_DEV             7
-#define BIO_RW_FAILFAST_TRANSPORT       8
-#define BIO_RW_FAILFAST_DRIVER          9
-#define BIO_RW_NOIDLE   10
+enum bio_rw_flags {
+        BIO_RW,
+        BIO_RW_FAILFAST_DEV,
+        BIO_RW_FAILFAST_TRANSPORT,
+        BIO_RW_FAILFAST_DRIVER,
+        /* above flags must match REQ_* */
+        BIO_RW_AHEAD,
+        BIO_RW_BARRIER,
+        BIO_RW_SYNCIO,
+        BIO_RW_UNPLUG,
+        BIO_RW_META,
+        BIO_RW_DISCARD,
+        BIO_RW_NOIDLE,
+};
 
 #define bio_rw_flagged(bio, flag)       ((bio)->bi_rw & (1 << (flag)))