Merge commit 'v2.6.27-rc1' into for-linus

6 files changed, 61 insertions, 28 deletions

diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h
index 78bfdea24a8e..e98900671ca9 100644
--- a/include/linux/raid/bitmap.h
+++ b/include/linux/raid/bitmap.h
@@ -221,6 +221,7 @@ struct bitmap {
         unsigned long syncchunk;
 
         __u64   events_cleared;
+        int need_sync;
 
         /* bitmap spinlock */
         spinlock_t lock;
diff --git a/include/linux/raid/linear.h b/include/linux/raid/linear.h
index ba15469daf11..7e375111d007 100644
--- a/include/linux/raid/linear.h
+++ b/include/linux/raid/linear.h
@@ -16,7 +16,7 @@ struct linear_private_data
         struct linear_private_data *prev;       /* earlier version */
         dev_info_t              **hash_table;
         sector_t                hash_spacing;
-        sector_t                array_size;
+        sector_t                array_sectors;
         int                     preshift; /* shift before dividing by hash_spacing */
         dev_info_t              disks[0];
 };
diff --git a/include/linux/raid/md.h b/include/linux/raid/md.h
index b7386ae9d288..dc0e3fcb9f28 100644
--- a/include/linux/raid/md.h
+++ b/include/linux/raid/md.h
@@ -95,7 +95,7 @@ extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
                         struct page *page, int rw);
 extern void md_do_sync(mddev_t *mddev);
 extern void md_new_event(mddev_t *mddev);
-extern void md_allow_write(mddev_t *mddev);
+extern int md_allow_write(mddev_t *mddev);
 extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
 
 #endif /* CONFIG_MD */
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h
index 3dea9f545c8f..9f2549ac0e2d 100644
--- a/include/linux/raid/md_k.h
+++ b/include/linux/raid/md_k.h
@@ -59,7 +59,7 @@ struct mdk_rdev_s
         int             sb_loaded;
         __u64           sb_events;
         sector_t        data_offset;    /* start of data in array */
-        sector_t        sb_offset;
+        sector_t        sb_start;       /* offset of the super block (in 512byte sectors) */
         int             sb_size;        /* bytes in the superblock */
         int             preferred_minor;        /* autorun support */
 
@@ -87,6 +87,9 @@ struct mdk_rdev_s
 #define Blocked         8               /* An error occured on an externally
                                          * managed array, don't allow writes
                                          * until it is cleared */
+#define StateChanged    9               /* Faulty or Blocked has changed during
+                                         * interrupt, so it needs to be
+                                         * notified by the thread */
         wait_queue_head_t blocked_wait;
 
         int desc_nr;                    /* descriptor index in the superblock */
@@ -147,7 +150,7 @@ struct mddev_s
         int                             raid_disks;
         int                             max_disks;
         sector_t                        size; /* used size of component devices */
-        sector_t                        array_size; /* exported array size */
+        sector_t                        array_sectors; /* exported array size */
         __u64                           events;
 
         char                            uuid[16];
@@ -188,6 +191,7 @@ struct mddev_s
          * NEEDED:   we might need to start a resync/recover
          * RUNNING:  a thread is running, or about to be started
          * SYNC:     actually doing a resync, not a recovery
+         * RECOVER:  doing recovery, or need to try it.
          * INTR:     resync needs to be aborted for some reason
          * DONE:     thread is done and is waiting to be reaped
          * REQUEST:  user-space has requested a sync (used with SYNC)
@@ -198,6 +202,7 @@ struct mddev_s
          */
 #define MD_RECOVERY_RUNNING     0
 #define MD_RECOVERY_SYNC        1
+#define MD_RECOVERY_RECOVER     2
 #define MD_RECOVERY_INTR        3
 #define MD_RECOVERY_DONE        4
 #define MD_RECOVERY_NEEDED      5
@@ -210,7 +215,8 @@ struct mddev_s
 
         int                             in_sync;        /* know to not need resync */
         struct mutex                    reconfig_mutex;
-        atomic_t                        active;
+        atomic_t                        active;         /* general refcount */
+        atomic_t                        openers;        /* number of active opens */
 
         int                             changed;        /* true if we might need to reread partition info */
         int                             degraded;       /* whether md should consider
@@ -227,6 +233,8 @@ struct mddev_s
         atomic_t                        recovery_active; /* blocks scheduled, but not written */
         wait_queue_head_t               recovery_wait;
         sector_t                        recovery_cp;
+        sector_t                        resync_min;     /* user requested sync
+                                                         * starts here */
         sector_t                        resync_max;     /* resync should pause
                                                          * when it gets here */
 
@@ -331,6 +339,9 @@ static inline char * mdname (mddev_t * mddev)
 #define rdev_for_each(rdev, tmp, mddev)                         \
         rdev_for_each_list(rdev, tmp, (mddev)->disks)
 
+#define rdev_for_each_rcu(rdev, mddev)                          \
+        list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
+
 typedef struct mdk_thread_s {
         void                    (*run) (mddev_t *mddev);
         mddev_t                 *mddev;
diff --git a/include/linux/raid/md_p.h b/include/linux/raid/md_p.h
index 3f2cd98c508b..8b4de4a41ff1 100644
--- a/include/linux/raid/md_p.h
+++ b/include/linux/raid/md_p.h
@@ -43,14 +43,11 @@
  */
 #define MD_RESERVED_BYTES               (64 * 1024)
 #define MD_RESERVED_SECTORS             (MD_RESERVED_BYTES / 512)
-#define MD_RESERVED_BLOCKS              (MD_RESERVED_BYTES / BLOCK_SIZE)
 
 #define MD_NEW_SIZE_SECTORS(x)          ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
-#define MD_NEW_SIZE_BLOCKS(x)           ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
 
 #define MD_SB_BYTES                     4096
 #define MD_SB_WORDS                     (MD_SB_BYTES / 4)
-#define MD_SB_BLOCKS                    (MD_SB_BYTES / BLOCK_SIZE)
 #define MD_SB_SECTORS                   (MD_SB_BYTES / 512)
 
 /*
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index f0827d31ae6f..3b2672792457 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -158,6 +158,43 @@
  *    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_prexor_drain_run,     /* prexor-write */
+        reconstruct_state_drain_run,            /* write */
+        reconstruct_state_run,                  /* expand */
+        reconstruct_state_prexor_drain_result,
+        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 +206,13 @@ 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 +233,7 @@ 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 */
@@ -228,9 +260,7 @@ struct r6_state {
 #define R5_Wantfill     12 /* dev->toread contains a bio that needs
                                     * filling
                                     */
-#define R5_Wantprexor   13 /* distinguish blocks ready for rmw from
-                                    * other "towrites"
-                                    */
+#define R5_Wantdrain    13 /* dev->towrite needs to be drained */
 /*
  * Write method
  */
@@ -254,8 +284,10 @@ struct r6_state {
 #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
@@ -263,14 +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: