block: Optimal I/O limit wrapper

[pandora-kernel.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0146e0f..86c2bdf 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -70,11 +70,6 @@ enum rq_cmd_type_bits {
        REQ_TYPE_ATA_PC,
 };
 
-enum {
-       BLK_RW_ASYNC    = 0,
-       BLK_RW_SYNC     = 1,
-};
-
 /*
  * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being
  * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a
@@ -91,13 +86,14 @@ enum {
 };
 
 /*
- * request type modified bits. first two bits match BIO_RW* bits, important
+ * 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 */
@@ -119,6 +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 */
 };
 
@@ -147,6 +144,10 @@ 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)
 
 #define BLK_MAX_CDB    16
 
@@ -458,10 +459,12 @@ struct request_queue
 #define QUEUE_FLAG_NONROT      14      /* non-rotational device (SSD) */
 #define QUEUE_FLAG_VIRT        QUEUE_FLAG_NONROT /* paravirt device */
 #define QUEUE_FLAG_IO_STAT     15      /* do IO stats */
+#define QUEUE_FLAG_CQ         16       /* hardware does queuing */
 
 #define QUEUE_FLAG_DEFAULT     ((1 << QUEUE_FLAG_IO_STAT) |            \
                                 (1 << QUEUE_FLAG_CLUSTER) |            \
-                                (1 << QUEUE_FLAG_STACKABLE))
+                                (1 << QUEUE_FLAG_STACKABLE)    |       \
+                                (1 << QUEUE_FLAG_SAME_COMP))
 
 static inline int queue_is_locked(struct request_queue *q)
 {
@@ -580,6 +583,7 @@ enum {
 
 #define blk_queue_plugged(q)   test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
 #define blk_queue_tagged(q)    test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
+#define blk_queue_queuing(q)   test_bit(QUEUE_FLAG_CQ, &(q)->queue_flags)
 #define blk_queue_stopped(q)   test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
 #define blk_queue_nomerges(q)  test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
 #define blk_queue_nonrot(q)    test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
@@ -833,11 +837,13 @@ 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)
 {
@@ -854,6 +860,8 @@ 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;
@@ -864,6 +872,11 @@ 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.
  */
@@ -890,10 +903,12 @@ 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 *);
@@ -918,7 +933,9 @@ extern void blk_queue_logical_block_size(struct request_queue *, unsigned short)
 extern void blk_queue_physical_block_size(struct request_queue *, unsigned short);
 extern void blk_queue_alignment_offset(struct request_queue *q,
                                       unsigned int alignment);
+extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
 extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
+extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
 extern void blk_set_default_limits(struct queue_limits *lim);
 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,