Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 103 insertions, 0 deletions

diff --git a/include/linux/raid/raid10.h b/include/linux/raid/raid10.h
new file mode 100644
index 000000000000..60708789c8f9
--- /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