block: implement mixed merge of different failfast requests

[firefly-linux-kernel-4.4.55.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c3015736d814baa82ff80676dbf56fa941241c80..650b6a9cb679f9999b6af1ecbd4c084ac6ad213d 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -115,6 +115,7 @@ enum rq_flag_bits {
        __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 */
 };
 
@@ -143,6 +144,7 @@ enum rq_flag_bits {
 #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)
@@ -832,11 +834,13 @@ static inline void blk_run_address_space(struct address_space *mapping)
 }
 
 /*
- * blk_rq_pos()                : the current sector
- * blk_rq_bytes()      : bytes left in the entire request
- * blk_rq_cur_bytes()  : bytes left in the current segment
- * blk_rq_sectors()    : sectors left in the entire request
- * blk_rq_cur_sectors()        : sectors left in the current segment
+ * blk_rq_pos()                        : the current sector
+ * blk_rq_bytes()              : bytes left in the entire request
+ * blk_rq_cur_bytes()          : bytes left in the current segment
+ * blk_rq_err_bytes()          : bytes left till the next error boundary
+ * blk_rq_sectors()            : sectors left in the entire request
+ * blk_rq_cur_sectors()                : sectors left in the current segment
+ * blk_rq_err_sectors()                : sectors left till the next error boundary
  */
 static inline sector_t blk_rq_pos(const struct request *rq)
 {
@@ -853,6 +857,8 @@ static inline int blk_rq_cur_bytes(const struct request *rq)
        return rq->bio ? bio_cur_bytes(rq->bio) : 0;
 }
 
+extern unsigned int blk_rq_err_bytes(const struct request *rq);
+
 static inline unsigned int blk_rq_sectors(const struct request *rq)
 {
        return blk_rq_bytes(rq) >> 9;
@@ -863,6 +869,11 @@ static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
        return blk_rq_cur_bytes(rq) >> 9;
 }
 
+static inline unsigned int blk_rq_err_sectors(const struct request *rq)
+{
+       return blk_rq_err_bytes(rq) >> 9;
+}
+
 /*
  * Request issue related functions.
  */
@@ -889,10 +900,12 @@ extern bool blk_end_request(struct request *rq, int error,
                            unsigned int nr_bytes);
 extern void blk_end_request_all(struct request *rq, int error);
 extern bool blk_end_request_cur(struct request *rq, int error);
+extern bool blk_end_request_err(struct request *rq, int error);
 extern bool __blk_end_request(struct request *rq, int error,
                              unsigned int nr_bytes);
 extern void __blk_end_request_all(struct request *rq, int error);
 extern bool __blk_end_request_cur(struct request *rq, int error);
+extern bool __blk_end_request_err(struct request *rq, int error);
 
 extern void blk_complete_request(struct request *);
 extern void __blk_complete_request(struct request *);