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Annotation of wikisrc/projects/project/ffs-fallocate.mdwn, revision 1.1

1.1     ! dholland    1: [[!template id=project
        !             2: 
        !             3: title="fallocate for FFS"
        !             4: 
        !             5: contact="""
        !             6: [tech-kern](mailto:tech-kern@NetBSD.org)
        !             7: """
        !             8: 
        !             9: mentors="""
        !            10: """
        !            11: 
        !            12: category="filesystems"
        !            13: difficulty="easy"
        !            14: duration="1-2 months"
        !            15: 
        !            16: description="""
        !            17: The fallocate/posix_fallocate system call, and the file-system-level
        !            18: VOP_FALLOCATE operation backing it, allow preallocating underlying
        !            19: storage for files before writing into them.
        !            20: 
        !            21: This is useful for improving the physical layout of files that are
        !            22: written in arbitrary order, such as files downloaded by bittorrent; it
        !            23: also allows failing up front if disk space runs out while saving a
        !            24: file.
        !            25: 
        !            26: This functionality is not currently implemented for FFS; implement it.
        !            27: (For regular files.)
        !            28: There is not much to this besides running the existing block
        !            29: allocation logic in a loop.
        !            30: (Note though that as the loop might take a while for large
        !            31: allocations, it's important to check for signals periodically to allow
        !            32: the operation to be interrupted.)
        !            33: 
        !            34: """
        !            35: 
        !            36: ]]