[PATCH] md: Core of raid5 resize process

[mirror_ubuntu-zesty-kernel.git] / include / linux / raid / raid5.h

diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 394da8207b3493d37412b4fc628f7feedde34733..55c738d50508e995cc4679901915753f0f663c99 100644 (file)
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -135,6 +135,7 @@ struct stripe_head {
        atomic_t                count;                  /* nr of active thread/requests */
        spinlock_t              lock;
        int                     bm_seq; /* sequence number for bitmap flushes */
+       int                     disks;                  /* disks in stripe */
        struct r5dev {
                struct bio      req;
                struct bio_vec  vec;
@@ -156,6 +157,7 @@ struct stripe_head {
 #define        R5_ReadError    8       /* seen a read error here recently */
 #define        R5_ReWrite      9       /* have tried to over-write the readerror */
 
+#define        R5_Expanded     10      /* This block now has post-expand data */
 /*
  * Write method
  */
@@ -174,7 +176,9 @@ struct stripe_head {
 #define        STRIPE_DELAYED          6
 #define        STRIPE_DEGRADED         7
 #define        STRIPE_BIT_DELAY        8
-
+#define        STRIPE_EXPANDING        9
+#define        STRIPE_EXPAND_SOURCE    10
+#define        STRIPE_EXPAND_READY     11
 /*
  * Plugging:
  *
@@ -211,12 +215,20 @@ struct raid5_private_data {
        int                     raid_disks, working_disks, failed_disks;
        int                     max_nr_stripes;
 
+       /* used during an expand */
+       sector_t                expand_progress;        /* MaxSector when no expand happening */
+       int                     previous_raid_disks;
+
        struct list_head        handle_list; /* stripes needing handling */
        struct list_head        delayed_list; /* stripes that have plugged requests */
        struct list_head        bitmap_list; /* stripes delaying awaiting bitmap update */
        atomic_t                preread_active_stripes; /* stripes with scheduled io */
 
-       char                    cache_name[20];
+       /* unfortunately we need two cache names as we temporarily have
+        * two caches.
+        */
+       int                     active_name;
+       char                    cache_name[2][20];
        kmem_cache_t            *slab_cache; /* for allocating stripes */
 
        int                     seq_flush, seq_write;
@@ -238,9 +250,10 @@ struct raid5_private_data {
        wait_queue_head_t       wait_for_overlap;
        int                     inactive_blocked;       /* release of inactive stripes blocked,
                                                         * waiting for 25% to be free
-                                                        */        
+                                                        */
+       int                     pool_size; /* number of disks in stripeheads in pool */
        spinlock_t              device_lock;
-       struct disk_info        disks[0];
+       struct disk_info        *disks;
 };
 
 typedef struct raid5_private_data raid5_conf_t;