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    btrfs: add cancellation points to defrag · 210549eb
    David Sterba 提交于
    The defrag operation can take very long, we want to have a way how to
    cancel it. The code checks for a pending signal at safe points in the
    defrag loops and returns EAGAIN. This means a user can press ^C after
    running 'btrfs fi defrag', woks for both defrag modes, files and root.
    
    Returning from the command was instant in my light tests, but may take
    longer depending on the aging factor of the filesystem.
    Signed-off-by: NDavid Sterba <dsterba@suse.cz>
    Signed-off-by: NJosef Bacik <jbacik@fusionio.com>
    210549eb
ctree.h 121.0 KB