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  • Filipe Manana's avatar
    Btrfs: make btrfs_search_forward return with nodes unlocked · f98de9b9
    Filipe Manana authored
    None of the uses of btrfs_search_forward() need to have the path
    nodes (level >= 1) read locked, only the leaf needs to be locked
    while the caller processes it. Therefore make it return a path
    with all nodes unlocked, except for the leaf.
    This change is motivated by the observation that during a file
    fsync we repeatdly call btrfs_search_forward() and process the
    returned leaf while upper nodes of the returned path (level >= 1)
    are read locked, which unnecessarily blocks other tasks that want
    to write to the same fs/subvol btree.
    Therefore instead of modifying the fsync code to unlock all nodes
    with level >= 1 immediately after calling btrfs_search_forward(),
    change btrfs_search_forward() to do it, so that it benefits all
    Signed-off-by: default avatarFilipe Manana <>
    Signed-off-by: default avatarChris Mason <>