process_ibfile doesn't handle partial reads

[GoogleCodeExporter]

process_ibfile assumes that partial reads (returns less than the requested
amount of data) indicates an error. That is not an error and more likely
when reading from NFS.

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The code from process_ibfile is:
        // Read pages to the end of file
        while ((read_bytes = read(fn, page, UNIV_PAGE_SIZE)) ==
UNIV_PAGE_SIZE) {

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The reads should be retried until -1 is returned. From the man page:
       On success, the number of bytes read is returned (zero indicates end
of file), and the file position is advanced by this number.  It is not an
error if this number is smaller than
       the number of bytes requested; this may happen for example because
fewer bytes are actually available right now (maybe because we were close
to  end-of-file,  or  because  we  are
       reading from a pipe, or from a terminal), or because read() was
interrupted by a signal.  On error, -1 is returned, and errno is set
appropriately. In this case it is left unspec-
       ified whether the file position (if any) changes.

Original issue reported on code.google.com by [email protected] on 8 Oct 2009 at 4:03