D19163.diff
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	Index: sys/fs/fuse/fuse_vnops.c
	===================================================================
	--- sys/fs/fuse/fuse_vnops.c
	+++ sys/fs/fuse/fuse_vnops.c
	@@ -949,12 +949,45 @@
	vref(dvp);
	*vpp = dvp;
	} else {
	+ struct fuse_vnode_data *fvdat;
	+
	err = fuse_vnode_get(vnode_mount(dvp), feo, nid, dvp,
	&vp, cnp, IFTOVT(fattr->mode));
	if (err) {
	goto out;
	}
	fuse_vnode_setparent(vp, dvp);
	+
	+ /*
	+ * In the case where we are looking up a FUSE node
	+ * represented by an existing cached vnode, and the
	+ * true size reported by FUSE_LOOKUP doesn't match
	+ * the vnode's cached size, fix the vnode cache to
	+ * match the real object size.
	+ *
	+ * This can occur via FUSE distributed filesystems,
	+ * irregular files, etc.
	+ */
	+ fvdat = VTOFUD(vp);
	+ if (vnode_isreg(vp) &&
	+ fattr->size != fvdat->filesize) {
	+ /*
	+ * The FN_SIZECHANGE flag reflects a dirty
	+ * append. If userspace lets us know our cache
	+ * is invalid, that write was lost. (Dirty
	+ * writes that do not cause append are also
	+ * lost, but we don't detect them here.)
	+ *
	+ * XXX: Maybe disable WB caching on this mount.
	+ */
	+ if (fvdat->flag & FN_SIZECHANGE)
	+ printf("%s: WB cache incoherent on "
	+ "%s!\n", __func__,
	+ vnode_mount(vp)->mnt_stat.f_mntonname);
	+
	+ (void)fuse_vnode_setsize(vp, cred, fattr->size);
	+ fvdat->flag &= ~FN_SIZECHANGE;
	+ }
	*vpp = vp;
	}