Btrfs: Add chunk uuids and update multi-device back references
Block headers now store the chunk tree uuid
Chunk items records the device uuid for each stripes
Device extent items record better back refs to the chunk tree
Block groups record better back refs to the chunk tree
The chunk tree format has also changed. The objectid of BTRFS_CHUNK_ITEM_KEY
used to be the logical offset of the chunk. Now it is a chunk tree id,
with the logical offset being stored in the offset field of the key.
This allows a single chunk tree to record multiple logical address spaces,
upping the number of bytes indexed by a chunk tree from 2^64 to
2^128.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e49147e..71f045c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -35,10 +35,6 @@
btrfs_root *extent_root);
static int del_pending_extents(struct btrfs_trans_handle *trans, struct
btrfs_root *extent_root);
-int btrfs_make_block_group(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, u64 bytes_used,
- u64 type, u64 chunk_tree, u64 chunk_objectid,
- u64 size);
static int cache_block_group(struct btrfs_root *root,
@@ -980,7 +976,6 @@
ret = get_state_private(block_group_cache, start, &ptr);
if (ret)
break;
-
cache = (struct btrfs_block_group_cache *)(unsigned long)ptr;
err = write_one_cache_group(trans, root,
path, cache);
@@ -1094,8 +1089,7 @@
BUG_ON(ret);
ret = btrfs_make_block_group(trans, extent_root, 0, flags,
- extent_root->fs_info->chunk_root->root_key.objectid,
- start, num_bytes);
+ BTRFS_FIRST_CHUNK_TREE_OBJECTID, start, num_bytes);
BUG_ON(ret);
return 0;
@@ -2782,7 +2776,7 @@
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytes_used,
- u64 type, u64 chunk_tree, u64 chunk_objectid,
+ u64 type, u64 chunk_objectid, u64 chunk_offset,
u64 size)
{
int ret;
@@ -2796,14 +2790,14 @@
cache = kmalloc(sizeof(*cache), GFP_NOFS);
BUG_ON(!cache);
- cache->key.objectid = chunk_objectid;
+ cache->key.objectid = chunk_offset;
cache->key.offset = size;
cache->cached = 0;
cache->pinned = 0;
+
btrfs_set_key_type(&cache->key, BTRFS_BLOCK_GROUP_ITEM_KEY);
memset(&cache->item, 0, sizeof(cache->item));
btrfs_set_block_group_used(&cache->item, bytes_used);
- btrfs_set_block_group_chunk_tree(&cache->item, chunk_tree);
btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
cache->flags = type;
btrfs_set_block_group_flags(&cache->item, type);
@@ -2813,12 +2807,12 @@
BUG_ON(ret);
bit = block_group_state_bits(type);
- set_extent_bits(block_group_cache, chunk_objectid,
- chunk_objectid + size - 1,
+ set_extent_bits(block_group_cache, chunk_offset,
+ chunk_offset + size - 1,
bit | EXTENT_LOCKED, GFP_NOFS);
- set_state_private(block_group_cache, chunk_objectid,
- (unsigned long)cache);
+ set_state_private(block_group_cache, chunk_offset,
+ (unsigned long)cache);
ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item,
sizeof(cache->item));
BUG_ON(ret);