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Btrfs: superblock duplication

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This patch implements superblock duplication. Superblocks
are stored at offset 16K, 64M and 256G on every devices.
Spaces used by superblocks are preserved by the allocator,
which uses a reverse mapping function to find the logical
addresses that correspond to superblocks. Thank you,

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng
2008-12-08 16:46:26 -05:00
committed by Chris Mason
parent d20f7043fa
commit a512bbf855
8 changed files with 279 additions and 119 deletions
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3
fs/btrfs/tree-log.c
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@@ -1996,7 +1996,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
btrfs_set_super_log_root_level(&root->fs_info->super_for_commit,
btrfs_header_level(log->fs_info->log_root_tree->node));
write_ctree_super(trans, log->fs_info->tree_root);
write_ctree_super(trans, log->fs_info->tree_root, 2);
log->fs_info->tree_log_transid++;
log->fs_info->tree_log_batch = 0;
atomic_set(&log->fs_info->tree_log_commit, 0);
@@ -2006,7 +2006,6 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
out:
mutex_unlock(&log->fs_info->tree_log_mutex);
return 0;
}
/* * free all the extents used by the tree log. This should be called