md: replace STRIPE_OP_{BIODRAIN,PREXOR,POSTXOR} with 'reconstruct_states'

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / raid / raid5.h

diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 93678f57ccbe280d3b681aa5c31a2c5049c32a6a..5f3e674b87dddf9cf5cd38dab9d176cd1d92234e 100644 (file)
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -158,6 +158,41 @@
  *    the compute block completes.
  */
 
+/*
+ * Operations state - intermediate states that are visible outside of sh->lock
+ * In general _idle indicates nothing is running, _run indicates a data
+ * processing operation is active, and _result means the data processing result
+ * is stable and can be acted upon.  For simple operations like biofill and
+ * compute that only have an _idle and _run state they are indicated with
+ * sh->state flags (STRIPE_BIOFILL_RUN and STRIPE_COMPUTE_RUN)
+ */
+/**
+ * enum check_states - handles syncing / repairing a stripe
+ * @check_state_idle - check operations are quiesced
+ * @check_state_run - check operation is running
+ * @check_state_result - set outside lock when check result is valid
+ * @check_state_compute_run - check failed and we are repairing
+ * @check_state_compute_result - set outside lock when compute result is valid
+ */
+enum check_states {
+       check_state_idle = 0,
+       check_state_run, /* parity check */
+       check_state_check_result,
+       check_state_compute_run, /* parity repair */
+       check_state_compute_result,
+};
+
+/**
+ * enum reconstruct_states - handles writing or expanding a stripe
+ */
+enum reconstruct_states {
+       reconstruct_state_idle = 0,
+       reconstruct_state_drain_run,            /* write */
+       reconstruct_state_run,                  /* expand */
+       reconstruct_state_drain_result,
+       reconstruct_state_result,
+};
+
 struct stripe_head {
        struct hlist_node       hash;
        struct list_head        lru;                    /* inactive_list or handle_list */
@@ -169,19 +204,13 @@ struct stripe_head {
        spinlock_t              lock;
        int                     bm_seq; /* sequence number for bitmap flushes */
        int                     disks;                  /* disks in stripe */
+       enum check_states       check_state;
+       enum reconstruct_states reconstruct_state;
        /* stripe_operations
-        * @pending - pending ops flags (set for request->issue->complete)
-        * @ack - submitted ops flags (set for issue->complete)
-        * @complete - completed ops flags (set for complete)
         * @target - STRIPE_OP_COMPUTE_BLK target
-        * @count - raid5_runs_ops is set to run when this is non-zero
         */
        struct stripe_operations {
-               unsigned long      pending;
-               unsigned long      ack;
-               unsigned long      complete;
                int                target;
-               int                count;
                u32                zero_sum_result;
        } ops;
        struct r5dev {
@@ -202,6 +231,7 @@ struct stripe_head_state {
        int locked, uptodate, to_read, to_write, failed, written;
        int to_fill, compute, req_compute, non_overwrite;
        int failed_num;
+       unsigned long ops_request;
 };
 
 /* r6_state - extra state data only relevant to r6 */
@@ -252,8 +282,12 @@ struct r6_state {
 #define        STRIPE_EXPANDING        9
 #define        STRIPE_EXPAND_SOURCE    10
 #define        STRIPE_EXPAND_READY     11
+#define        STRIPE_IO_STARTED       12 /* do not count towards 'bypass_count' */
+#define        STRIPE_FULL_WRITE       13 /* all blocks are set to be overwritten */
+#define        STRIPE_BIOFILL_RUN      14
+#define        STRIPE_COMPUTE_RUN      15
 /*
- * Operations flags (in issue order)
+ * Operation request flags
  */
 #define STRIPE_OP_BIOFILL      0
 #define STRIPE_OP_COMPUTE_BLK  1
@@ -261,14 +295,6 @@ struct r6_state {
 #define STRIPE_OP_BIODRAIN     3
 #define STRIPE_OP_POSTXOR      4
 #define STRIPE_OP_CHECK        5
-#define STRIPE_OP_IO           6
-
-/* modifiers to the base operations
- * STRIPE_OP_MOD_REPAIR_PD - compute the parity block and write it back
- * STRIPE_OP_MOD_DMA_CHECK - parity is not corrupted by the check
- */
-#define STRIPE_OP_MOD_REPAIR_PD 7
-#define STRIPE_OP_MOD_DMA_CHECK 8
 
 /*
  * Plugging:
@@ -316,12 +342,17 @@ struct raid5_private_data {
        int                     previous_raid_disks;
 
        struct list_head        handle_list; /* stripes needing handling */
+       struct list_head        hold_list; /* preread ready stripes */
        struct list_head        delayed_list; /* stripes that have plugged requests */
        struct list_head        bitmap_list; /* stripes delaying awaiting bitmap update */
        struct bio              *retry_read_aligned; /* currently retrying aligned bios   */
        struct bio              *retry_read_aligned_list; /* aligned bios retry list  */
        atomic_t                preread_active_stripes; /* stripes with scheduled io */
        atomic_t                active_aligned_reads;
+       atomic_t                pending_full_writes; /* full write backlog */
+       int                     bypass_count; /* bypassed prereads */
+       int                     bypass_threshold; /* preread nice */
+       struct list_head        *last_hold; /* detect hold_list promotions */
 
        atomic_t                reshape_stripes; /* stripes with pending writes for reshape */
        /* unfortunately we need two cache names as we temporarily have