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authorChris Malley <mail@chrismalley.co.uk>2007-09-26 00:19:18 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-09-26 12:22:04 -0400
commitf6a592e8abd2f2394623ce5427cbb4c265495974 (patch)
treeff5e176b3ee0832978babae80bb13f32c8a77699 /Documentation/lguest
parent78bd8fbbcd66fc977baa40e7fd838a4461b0f727 (diff)
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 <mail@chrismalley.co.uk> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/lguest')
-rw-r--r--Documentation/lguest/lguest.c2
1 files changed, 1 insertions, 1 deletions
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,
882 * of the block file (possibly extending it). */ 882 * of the block file (possibly extending it). */
883 if (off + len > device_len) { 883 if (off + len > device_len) {
884 /* Trim it back to the correct length */ 884 /* Trim it back to the correct length */
885 ftruncate(dev->fd, device_len); 885 ftruncate64(dev->fd, device_len);
886 /* Die, bad Guest, die. */ 886 /* Die, bad Guest, die. */
887 errx(1, "Write past end %llu+%u", off, len); 887 errx(1, "Write past end %llu+%u", off, len);
888 } 888 }