Btrfs: Add a write ahead tree log to optimize synchronous operations
File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -202,8 +202,9 @@ again:
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memcpy(&found_key, &key, sizeof(key));
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key.offset++;
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btrfs_release_path(root, path);
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dead_root = btrfs_read_fs_root_no_radix(root->fs_info,
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&found_key);
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dead_root =
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btrfs_read_fs_root_no_radix(root->fs_info->tree_root,
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&found_key);
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if (IS_ERR(dead_root)) {
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ret = PTR_ERR(dead_root);
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goto err;
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