[RFC ONLY 1/6] btrfs-progs: add raid-stripe-tree definitions

[Johannes Thumshirn <johannes.thumshirn@wdc.com>]

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 kernel-shared/ctree.h | 49 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/kernel-shared/ctree.h b/kernel-shared/ctree.h
index 68943ff294cc..56b3185001af 100644
--- a/kernel-shared/ctree.h
+++ b/kernel-shared/ctree.h
@@ -300,6 +300,24 @@ struct btrfs_chunk {
 	/* additional stripes go here */
 } __attribute__ ((__packed__));
 
+struct btrfs_stripe_extent {
+	/* btrfs device-id this raid extent  lives on */
+	__le64 devid;
+	/* offset from  the devextent start */
+	__le64 offset;
+} __attribute__ ((__packed__));
+
+struct btrfs_dp_stripe {
+	/* logical address for this stripe */
+	__le64 logical;
+	/* size of this stripe in bytes */
+	__le32 size;
+	/* reserved for future use/padding */
+	__le32 reserved;
+	/* array of stripe extents this stripe is comprised of */
+	struct btrfs_stripe_extent extents;
+} __attribute__ ((__packed__));
+
 #define BTRFS_FREE_SPACE_EXTENT	1
 #define BTRFS_FREE_SPACE_BITMAP	2
 
@@ -1206,6 +1224,7 @@ struct btrfs_fs_info {
 	struct btrfs_root *quota_root;
 	struct btrfs_root *uuid_root;
 	struct btrfs_root *block_group_root;
+	struct btrfs_root *stripe_root;
 
 	struct rb_root global_roots_tree;
 	struct rb_root fs_root_tree;
@@ -1749,6 +1768,36 @@ BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
 		   extent_count, 32);
 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
 
+/* struct btrfs_dp_stripe */
+BTRFS_SETGET_FUNCS(dp_stripe_logical, struct btrfs_dp_stripe, logical, 64);
+BTRFS_SETGET_FUNCS(dp_stripe_size, struct btrfs_dp_stripe, size, 32);
+BTRFS_SETGET_FUNCS(stripe_extent_devid, struct btrfs_stripe_extent, devid, 64);
+BTRFS_SETGET_FUNCS(stripe_extent_offset, struct btrfs_stripe_extent, offset, 64);
+
+static inline struct btrfs_stripe_extent *btrfs_stripe_extent_nr(
+						 struct btrfs_dp_stripe *dps,
+						 int nr)
+{
+	unsigned long offset = (unsigned long)dps;
+	offset += offsetof(struct btrfs_dp_stripe, extents);
+	offset += nr * sizeof(struct btrfs_stripe_extent);
+	return (struct btrfs_stripe_extent *)offset;
+}
+
+static inline u64 btrfs_stripe_extent_devid_nr(struct extent_buffer *eb,
+					       struct btrfs_dp_stripe *dps,
+					       int nr)
+{
+	return btrfs_stripe_extent_devid(eb, btrfs_stripe_extent_nr(dps, nr));
+}
+
+static inline u64 btrfs_stripe_extent_offset_nr(struct extent_buffer *eb,
+						struct btrfs_dp_stripe *dps,
+						int nr)
+{
+	return btrfs_stripe_extent_offset(eb, btrfs_stripe_extent_nr(dps, nr));
+}
+
 /* struct btrfs_inode_ref */
 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
 BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
-- 
2.35.3