X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=lib%2Flibzfs%2Flibzfs_import.c;h=58b6043be5a7a7e41e8647c98366185208bec51b;hb=51a3ae72d23d89d35a4a67059b39e870d66a2495;hp=791aaad535e525288c89d00e1683a8fab0e181ab;hpb=50210587563bb37c48d2624d11e158ab3ad30715;p=zfs.git

diff --git a/lib/libzfs/libzfs_import.c b/lib/libzfs/libzfs_import.c
index 791aaad..58b6043 100644
--- a/lib/libzfs/libzfs_import.c
+++ b/lib/libzfs/libzfs_import.c
@@ -900,6 +900,36 @@ zpool_read_label(int fd, nvlist_t **config)
 	return (0);
 }
 
+/*
+ * Given a file descriptor, clear (zero) the label information.  This function
+ * is currently only used in the appliance stack as part of the ZFS sysevent
+ * module.
+ */
+int
+zpool_clear_label(int fd)
+{
+	struct stat64 statbuf;
+	int l;
+	vdev_label_t *label;
+	uint64_t size;
+
+	if (fstat64_blk(fd, &statbuf) == -1)
+		return (0);
+	size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
+
+	if ((label = calloc(sizeof (vdev_label_t), 1)) == NULL)
+		return (-1);
+
+	for (l = 0; l < VDEV_LABELS; l++) {
+		if (pwrite64(fd, label, sizeof (vdev_label_t),
+		    label_offset(size, l)) != sizeof (vdev_label_t))
+			return (-1);
+	}
+
+	free(label);
+	return (0);
+}
+
 #ifdef HAVE_LIBBLKID
 /*
  * Use libblkid to quickly search for zfs devices