D31293.diff
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	diff --git a/sys/geom/geom_dev.c b/sys/geom/geom_dev.c
	--- a/sys/geom/geom_dev.c
	+++ b/sys/geom/geom_dev.c
	@@ -654,19 +654,6 @@
	error = EINVAL;
	break;
	}
	- if ((pp->mediasize > 0) && (offset >= pp->mediasize)) {
	- /*
	- * Catch out-of-bounds requests here. The problem is
	- * that due to historical GEOM I/O implementation
	- * peculatities, g_delete_data() would always return
	- * success for requests starting just the next byte
	- * after providers media boundary. Condition check on
	- * non-zero media size, since that condition would
	- * (most likely) cause ENXIO instead.
	- */
	- error = EIO;
	- break;
	- }
	while (length > 0) {
	chunk = length;
	if (g_dev_del_max_sectors != 0 &&
	diff --git a/sys/geom/geom_io.c b/sys/geom/geom_io.c
	--- a/sys/geom/geom_io.c
	+++ b/sys/geom/geom_io.c
	@@ -886,6 +886,8 @@
	bp->bio_data = ptr;
	g_io_request(bp, cp);
	errorc = biowait(bp, "gread");
	+ if (errorc == 0 && bp->bio_completed != length)
	+ errorc = EIO;
	if (error != NULL)
	*error = errorc;
	g_destroy_bio(bp);
	@@ -940,6 +942,8 @@
	bp->bio_data = ptr;
	g_io_request(bp, cp);
	error = biowait(bp, "gwrite");
	+ if (error == 0 && bp->bio_completed != length)
	+ error = EIO;
	g_destroy_bio(bp);
	return (error);
	}
	@@ -971,6 +975,8 @@
	bp->bio_data = NULL;
	g_io_request(bp, cp);
	error = biowait(bp, "gdelete");
	+ if (error == 0 && bp->bio_completed != length)
	+ error = EIO;
	g_destroy_bio(bp);
	return (error);
	}