This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / raid / raid10.h

diff --git a/include/linux/raid/raid10.h b/include/linux/raid/raid10.h
new file mode 100644 (file)
index 0000000..6070878
--- /dev/null
+++ b/include/linux/raid/raid10.h
@@ -0,0 +1,103 @@
+#ifndef _RAID10_H
+#define _RAID10_H
+
+#include <linux/raid/md.h>
+
+typedef struct mirror_info mirror_info_t;
+
+struct mirror_info {
+       mdk_rdev_t      *rdev;
+       sector_t        head_position;
+};
+
+typedef struct r10bio_s r10bio_t;
+
+struct r10_private_data_s {
+       mddev_t                 *mddev;
+       mirror_info_t           *mirrors;
+       int                     raid_disks;
+       int                     working_disks;
+       spinlock_t              device_lock;
+
+       /* geometry */
+       int                     near_copies;  /* number of copies layed out raid0 style */
+       int                     far_copies;   /* number of copies layed out
+                                              * at large strides across drives
+                                              */
+       int                     copies;       /* near_copies * far_copies.
+                                              * must be <= raid_disks
+                                              */
+       sector_t                stride;       /* distance between far copies.
+                                              * This is size / far_copies
+                                              */
+
+       int chunk_shift; /* shift from chunks to sectors */
+       sector_t chunk_mask;
+
+       struct list_head        retry_list;
+       /* for use when syncing mirrors: */
+
+       spinlock_t              resync_lock;
+       int nr_pending;
+       int barrier;
+       sector_t                next_resync;
+
+       wait_queue_head_t       wait_idle;
+       wait_queue_head_t       wait_resume;
+
+       mempool_t *r10bio_pool;
+       mempool_t *r10buf_pool;
+};
+
+typedef struct r10_private_data_s conf_t;
+
+/*
+ * this is the only point in the RAID code where we violate
+ * C type safety. mddev->private is an 'opaque' pointer.
+ */
+#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
+
+/*
+ * this is our 'private' RAID10 bio.
+ *
+ * it contains information about what kind of IO operations were started
+ * for this RAID10 operation, and about their status:
+ */
+
+struct r10bio_s {
+       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;
+       /*
+        * original bio going to /dev/mdx
+        */
+       struct bio              *master_bio;
+       /*
+        * if the IO is in READ direction, then this is where we read
+        */
+       int                     read_slot;
+
+       struct list_head        retry_list;
+       /*
+        * if the IO is in WRITE direction, then multiple bios are used,
+        * one for each copy.
+        * 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.
+        */
+       struct {
+               struct bio              *bio;
+               sector_t addr;
+               int devnum;
+       } devs[0];
+};
+
+/* bits for r10bio.state */
+#define        R10BIO_Uptodate 0
+#define        R10BIO_IsSync   1
+#define        R10BIO_IsRecover 2
+#endif