Merge remote-tracking branch 'trivial/for-next'

[karo-tx-linux.git] / drivers / md / raid5.h

diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 2113ffa82c7a2506d21ce36076c3f6bd057d922b..01ad8ae8f57830a04de4e1e30b731f74660bda62 100644 (file)
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -49,7 +49,7 @@
  * can't distinguish between a clean block that has been generated
  * from parity calculations, and a clean block that has been
  * successfully written to the spare ( or to parity when resyncing).
- * To distingush these states we have a stripe bit STRIPE_INSYNC that
+ * To distinguish these states we have a stripe bit STRIPE_INSYNC that
  * is set whenever a write is scheduled to the spare, or to the parity
  * disc if there is no spare.  A sync request clears this bit, and
  * when we find it set with no buffers locked, we know the sync is
@@ -205,6 +205,7 @@ struct stripe_head {
        short                   pd_idx;         /* parity disk index */
        short                   qd_idx;         /* 'Q' disk index for raid6 */
        short                   ddf_layout;/* use DDF ordering to calculate Q */
+       short                   hash_lock_index;
        unsigned long           state;          /* state flags */
        atomic_t                count;        /* nr of active thread/requests */
        int                     bm_seq; /* sequence number for bitmap flushes */
@@ -367,9 +368,18 @@ struct disk_info {
        struct md_rdev  *rdev, *replacement;
 };
 
+/* NOTE NR_STRIPE_HASH_LOCKS must remain below 64.
+ * This is because we sometimes take all the spinlocks
+ * and creating that much locking depth can cause
+ * problems.
+ */
+#define NR_STRIPE_HASH_LOCKS 8
+#define STRIPE_HASH_LOCKS_MASK (NR_STRIPE_HASH_LOCKS - 1)
+
 struct r5worker {
        struct work_struct work;
        struct r5worker_group *group;
+       struct list_head temp_inactive_list[NR_STRIPE_HASH_LOCKS];
        bool working;
 };
 
@@ -382,6 +392,8 @@ struct r5worker_group {
 
 struct r5conf {
        struct hlist_head       *stripe_hashtbl;
+       /* only protect corresponding hash list and inactive_list */
+       spinlock_t              hash_locks[NR_STRIPE_HASH_LOCKS];
        struct mddev            *mddev;
        int                     chunk_sectors;
        int                     level, algorithm;
@@ -462,7 +474,8 @@ struct r5conf {
         * Free stripes pool
         */
        atomic_t                active_stripes;
-       struct list_head        inactive_list;
+       struct list_head        inactive_list[NR_STRIPE_HASH_LOCKS];
+       atomic_t                empty_inactive_list_nr;
        struct llist_head       released_stripes;
        wait_queue_head_t       wait_for_stripe;
        wait_queue_head_t       wait_for_overlap;
@@ -477,6 +490,7 @@ struct r5conf {
         * the new thread here until we fully activate the array.
         */
        struct md_thread        *thread;
+       struct list_head        temp_inactive_list[NR_STRIPE_HASH_LOCKS];
        struct r5worker_group   *worker_groups;
        int                     group_cnt;
        int                     worker_cnt_per_group;