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    SubjectRe: Is there a "make hole" (truncate in middle) syscall?
    >>>>> "Philippe" == Philippe Troin <phil@fifi.org> writes:

    Philippe> Peter Chubb <peter@chubb.wattle.id.au> writes:
    >> >>>>> "Rob" == Rob Landley <rob@landley.net> writes:
    >>
    Rob> You can make a file with a hole by seeking past it and never
    Rob> writing to that bit, but is there any way to punch a hole in a
    Rob> file after the fact? (I mean other with lseek and write. Having
    Rob> a sparse file as the result....)
    >> SVr4 has fcntl(fd, F_FREESP, flock) that frees the space covered by
    >> the struct flock in the file. Linux doesn't have this, at least in
    >> the baseline kernels.

    Philippe> However most SVr4 (at least Solaris and HP-UX) only
    Philippe> implement FREESP when the freed space is at the file's
    Philippe> tail. In other words, FREESP can only be used to implement
    Philippe> ftruncate().

    The original SVr4 worked in the middle of files too.

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