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    SubjectRe: 1352 NUL bytes at the end of a page?
    On Mon, May 17, 2004 at 11:17:38AM -0400, Theodore Ts'o wrote:
    > On Mon, May 17, 2004 at 08:56:40AM -0500, Wayne Scott wrote:
    > > From: Andrew Morton <akpm@osdl.org>
    > > > Well we can stop right there, because the only way someone can get some
    > > > more non-zero user data into this page before we memset and write it is by
    > > > locking the page beforehand, and block_write_full_page() has the page lock.
    > > > (Or they can write stuff into it via mmap, but writing to the page outside
    > > > i_size is an application bug).
    > >
    > > BTW: BitKeeper never opens a writable mmap to a file. The files are
    > > read with mmap() and written by fwriting to a tmp file and then
    > > renaming over the target. And since we run on Windows, no process has
    > > the file open when we are updating it.
    >
    > Note though that the stdio library uses a writeable mmap to implement
    > fwrite.

    That's news to me. And we use fwrite.
    --
    ---
    Larry McVoy lm at bitmover.com http://www.bitkeeper.com
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