X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=lib%2Flibzfs%2Flibzfs_import.c;h=9e79bd9348999d13c4b977a8243ee3abe95bc6fc;hb=a36bf1149d7408fde273851350c0ef6c0e4fe989;hp=791aaad535e525288c89d00e1683a8fab0e181ab;hpb=295304bed6fa6744b8d011e36b9c2180311cedb2;p=zfs.git

diff --git a/lib/libzfs/libzfs_import.c b/lib/libzfs/libzfs_import.c
index 791aaad..9e79bd9 100644
--- a/lib/libzfs/libzfs_import.c
+++ b/lib/libzfs/libzfs_import.c
@@ -862,7 +862,7 @@ zpool_read_label(int fd, nvlist_t **config)
 
 	*config = NULL;
 
-	if (fstat64(fd, &statbuf) == -1)
+	if (fstat64_blk(fd, &statbuf) == -1)
 		return (0);
 	size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
 
@@ -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 used in the appliance stack as part of the ZFS sysevent module and
+ * to implement the "zpool labelclear" command.
+ */
+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