[lkml]   [2003]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Is there a "make hole" (truncate in middle) syscall?
>>>>> "Philippe" == Philippe Troin <> writes:

Philippe> Peter Chubb <> writes:
>> >>>>> "Rob" == Rob Landley <> 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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:59    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean