1 files changed, 83 insertions, 49 deletions

diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 2316ac2e8e2..157d69e83ff 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -1,73 +1,87 @@
 #ifndef _RAID10_H
 #define _RAID10_H
 
-typedef struct mirror_info mirror_info_t;
-
-struct mirror_info {
-	mdk_rdev_t	*rdev;
+struct raid10_info {
+	struct md_rdev	*rdev, *replacement;
 	sector_t	head_position;
+	int		recovery_disabled;	/* matches
+						 * mddev->recovery_disabled
+						 * when we shouldn't try
+						 * recovering this device.
+						 */
 };
 
-typedef struct r10bio_s r10bio_t;
-
-struct r10_private_data_s {
-	mddev_t			*mddev;
-	mirror_info_t		*mirrors;
-	int			raid_disks;
+struct r10conf {
+	struct mddev		*mddev;
+	struct raid10_info	*mirrors;
+	struct raid10_info	*mirrors_new, *mirrors_old;
 	spinlock_t		device_lock;
 
 	/* geometry */
-	int			near_copies;  /* number of copies layed out raid0 style */
-	int 			far_copies;   /* number of copies layed out
+	struct geom {
+		int		raid_disks;
+		int		near_copies;  /* number of copies laid out
+					       * raid0 style */
+		int		far_copies;   /* number of copies laid out
 					       * at large strides across drives
 					       */
-	int			far_offset;   /* far_copies are offset by 1 stripe
-					       * instead of many
-					       */
-	int			copies;	      /* near_copies * far_copies.
-					       * must be <= raid_disks
+		int		far_offset;   /* far_copies are offset by 1
+					       * stripe instead of many
 					       */
-	sector_t		stride;	      /* distance between far copies.
+		sector_t	stride;	      /* distance between far copies.
 					       * This is size / far_copies unless
 					       * far_offset, in which case it is
 					       * 1 stripe.
 					       */
+		int             far_set_size; /* The number of devices in a set,
+					       * where a 'set' are devices that
+					       * contain far/offset copies of
+					       * each other.
+					       */
+		int		chunk_shift; /* shift from chunks to sectors */
+		sector_t	chunk_mask;
+	} prev, geo;
+	int			copies;	      /* near_copies * far_copies.
+					       * must be <= raid_disks
+					       */
 
-	sector_t		dev_sectors;  /* temp copy of mddev->dev_sectors */
-
-	int chunk_shift; /* shift from chunks to sectors */
-	sector_t chunk_mask;
+	sector_t		dev_sectors;  /* temp copy of
+					       * mddev->dev_sectors */
+	sector_t		reshape_progress;
+	sector_t		reshape_safe;
+	unsigned long		reshape_checkpoint;
+	sector_t		offset_diff;
 
 	struct list_head	retry_list;
 	/* queue pending writes and submit them on unplug */
 	struct bio_list		pending_bio_list;
-
+	int			pending_count;
 
 	spinlock_t		resync_lock;
-	int nr_pending;
-	int nr_waiting;
-	int nr_queued;
-	int barrier;
+	int			nr_pending;
+	int			nr_waiting;
+	int			nr_queued;
+	int			barrier;
 	sector_t		next_resync;
 	int			fullsync;  /* set to 1 if a full sync is needed,
 					    * (fresh device added).
 					    * Cleared when a sync completes.
 					    */
-
+	int			have_replacement; /* There is at least one
+						   * replacement device.
+						   */
 	wait_queue_head_t	wait_barrier;
 
-	mempool_t *r10bio_pool;
-	mempool_t *r10buf_pool;
+	mempool_t		*r10bio_pool;
+	mempool_t		*r10buf_pool;
 	struct page		*tmppage;
 
 	/* When taking over an array from a different personality, we store
 	 * the new thread here until we fully activate the array.
 	 */
-	struct mdk_thread_s	*thread;
+	struct md_thread	*thread;
 };
 
-typedef struct r10_private_data_s conf_t;
-
 /*
  * this is our 'private' RAID10 bio.
  *
@@ -75,14 +89,14 @@ typedef struct r10_private_data_s conf_t;
  * for this RAID10 operation, and about their status:
  */
 
-struct r10bio_s {
+struct r10bio {
 	atomic_t		remaining; /* 'have we finished' count,
 					    * used from IRQ handlers
 					    */
 	sector_t		sector;	/* virtual sector number */
 	int			sectors;
 	unsigned long		state;
-	mddev_t			*mddev;
+	struct mddev		*mddev;
 	/*
 	 * original bio going to /dev/mdx
 	 */
@@ -99,24 +113,44 @@ struct r10bio_s {
 	 * When resyncing we also use one for each copy.
 	 * When reconstructing, we use 2 bios, one for read, one for write.
 	 * We choose the number when they are allocated.
+	 * We sometimes need an extra bio to write to the replacement.
 	 */
-	struct {
-		struct bio		*bio;
-		sector_t addr;
-		int devnum;
+	struct r10dev {
+		struct bio	*bio;
+		union {
+			struct bio	*repl_bio; /* used for resync and
+						    * writes */
+			struct md_rdev	*rdev;	   /* used for reads
+						    * (read_slot >= 0) */
+		};
+		sector_t	addr;
+		int		devnum;
 	} devs[0];
 };
 
-/* when we get a read error on a read-only array, we redirect to another
- * device without failing the first device, or trying to over-write to
- * correct the read error.  To keep track of bad blocks on a per-bio
- * level, we store IO_BLOCKED in the appropriate 'bios' pointer
+/* bits for r10bio.state */
+enum r10bio_state {
+	R10BIO_Uptodate,
+	R10BIO_IsSync,
+	R10BIO_IsRecover,
+	R10BIO_IsReshape,
+	R10BIO_Degraded,
+/* Set ReadError on bios that experience a read error
+ * so that raid10d knows what to do with them.
+ */
+	R10BIO_ReadError,
+/* If a write for this request means we can clear some
+ * known-bad-block records, we set this flag.
  */
-#define IO_BLOCKED ((struct bio*)1)
+	R10BIO_MadeGood,
+	R10BIO_WriteError,
+/* During a reshape we might be performing IO on the
+ * 'previous' part of the array, in which case this
+ * flag is set
+ */
+	R10BIO_Previous,
+};
+
+extern int md_raid10_congested(struct mddev *mddev, int bits);
 
-/* bits for r10bio.state */
-#define	R10BIO_Uptodate	0
-#define	R10BIO_IsSync	1
-#define	R10BIO_IsRecover 2
-#define	R10BIO_Degraded 3
 #endif