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    SubjectRe: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.)
    On Mon, May 17, 2004 at 12:25:06AM -0700, Andrew Morton wrote:
    > Linus Torvalds <torvalds@osdl.org> wrote:
    > >
    > > Andrew, the obvious culprit would be the memset() in fs/buffer.c
    > > (block_write_full_page()
    >
    > There is one race.
    >
    > If an application does mmap(MAP_SHARED) of, say, a 2048 byte file and then
    > extends it:
    >
    > p = mmap(..., fd, ...);
    > ftructate(fd, 4096);
    > p[3000] = 1;
    >
    > A racing block_write_full_page() could fail to notice the extended i_size
    > and would decide to zap those 2048 bytes anyway.

    This isn't our problem, we only read with mmap(). We write with stdio.
    --
    ---
    Larry McVoy lm at bitmover.com http://www.bitkeeper.com
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