Btrfs: send, avoid unnecessary inode item lookup in the btree
Regardless of whether the caller is interested or not in knowing the inode's generation (dir_gen != NULL), get_first_ref always does a btree lookup to get the inode item. Avoid this useless lookup if dir_gen parameter is NULL (which is in some cases). Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: Chris Mason <clm@fb.com>
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@ -1693,10 +1693,12 @@ static int get_first_ref(struct btrfs_root *root, u64 ino,
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goto out;
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btrfs_release_path(path);
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ret = get_inode_info(root, parent_dir, NULL, dir_gen, NULL, NULL,
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NULL, NULL);
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if (ret < 0)
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goto out;
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if (dir_gen) {
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ret = get_inode_info(root, parent_dir, NULL, dir_gen, NULL,
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NULL, NULL, NULL);
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if (ret < 0)
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goto out;
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}
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*dir = parent_dir;
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@ -1712,13 +1714,12 @@ static int is_first_ref(struct btrfs_root *root,
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int ret;
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struct fs_path *tmp_name;
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u64 tmp_dir;
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u64 tmp_dir_gen;
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tmp_name = fs_path_alloc();
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if (!tmp_name)
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return -ENOMEM;
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ret = get_first_ref(root, ino, &tmp_dir, &tmp_dir_gen, tmp_name);
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ret = get_first_ref(root, ino, &tmp_dir, NULL, tmp_name);
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if (ret < 0)
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goto out;
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