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Btrfs: Add chunk uuids and update multi-device back references

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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>
This commit is contained in:
Chris Mason 2008-04-15 15:41:47 -04:00
parent b248a41529
commit e17cade25f
7 changed files with 160 additions and 62 deletions
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6
fs/btrfs/disk-io.c
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@ -1125,6 +1125,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
blocksize);
BUG_ON(!chunk_root->node);
read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
(unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
BTRFS_UUID_SIZE);
ret = btrfs_read_chunk_tree(chunk_root);
BUG_ON(ret);
@ -1229,7 +1233,7 @@ int write_all_supers(struct btrfs_root *root)
btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
write_extent_buffer(sb, dev->uuid,
(unsigned long)btrfs_device_uuid(dev_item),
BTRFS_DEV_UUID_SIZE);
BTRFS_UUID_SIZE);
btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
csum_tree_block(root, sb, 0);