From f6a592e8abd2f2394623ce5427cbb4c265495974 Mon Sep 17 00:00:00 2001 From: Chris Malley Date: Wed, 26 Sep 2007 14:19:18 +1000 Subject: [PATCH] lguest example launcher truncates block device file to 0 length on problems The function should also use ftruncate64() rather than ftruncate() to prevent files over 4GB (not uncommon for a root filesystem) being zeroed. Signed-off-by: Chris Malley Signed-off-by: Rusty Russell Signed-off-by: Linus Torvalds --- Documentation/lguest/lguest.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c index f7918401a007..73c5f1f3d5d2 100644 --- a/Documentation/lguest/lguest.c +++ b/Documentation/lguest/lguest.c @@ -882,7 +882,7 @@ static u32 handle_block_output(int fd, const struct iovec *iov, * of the block file (possibly extending it). */ if (off + len > device_len) { /* Trim it back to the correct length */ - ftruncate(dev->fd, device_len); + ftruncate64(dev->fd, device_len); /* Die, bad Guest, die. */ errx(1, "Write past end %llu+%u", off, len); }