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    SubjectRe: XFS and journalling filesystems

    On 28-May-99 Adam Lock wrote:
    > I was just browsing the BeOS site and that too claims to have a 64-bit
    > journalling filesystem. Perhaps that would be better suited for home systems
    > if
    > only there were more details available for it...

    More has been published about bfs than almost any other commercial filesystem.
    There's a book ("Practial File System Design with the Be file system") which
    goes into great detail about it. There's also one read-only implementation of
    a driver for Linux.

    The Be filesystem is pretty good. It's basically a traditional structure,
    except directories are btrees and there's a metadata journal. There's a number
    of interesting BeOS-specific features too, such as indexed file attributes.

    It does have some limitations. Block mapping is done with the normal
    single/double (no triple) indirect blocks, which contain extents. The maximum
    file size is about 34G on an unfragmented filesystem. The block mapping
    imposes a maximum number of extents, which means the max file size goes down as
    the disk fragments.

    It has definitely been designed as a single-user desktop filesystem. There's a
    number of tradeoffs which have been made against servers and towards
    single-user use, which makes sense given the nature of the OS.

    J

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