---

yaml
---
r: 188575
b: refs/heads/master
c: 752727a
h: refs/heads/master
i:
  188573: f500e3c
  188571: eeac914
  188567: ab5cf8f
  188559: 60fcd69
  188543: 293d411
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 13e38c8ae771d73bf6d1f0f98e35f99c0f0d48ff
+refs/heads/master: 752727a1b21a462d6ef634d552f180ae692f8947

trunk/fs/ceph/ceph_fs.c

@@ -3,6 +3,30 @@
  */
 #include "types.h"
 
+/*
+ * return true if @layout appears to be valid
+ */
+int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
+{
+	__u32 su = le32_to_cpu(layout->fl_stripe_unit);
+	__u32 sc = le32_to_cpu(layout->fl_stripe_count);
+	__u32 os = le32_to_cpu(layout->fl_object_size);
+
+	/* stripe unit, object size must be non-zero, 64k increment */
+	if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
+		return 0;
+	if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
+		return 0;
+	/* object size must be a multiple of stripe unit */
+	if (os < su || os % su)
+		return 0;
+	/* stripe count must be non-zero */
+	if (!sc)
+		return 0;
+	return 1;
+}
+
+
 int ceph_flags_to_mode(int flags)
 {
 #ifdef O_DIRECTORY  /* fixme */

trunk/fs/ceph/ceph_fs.h

@@ -72,7 +72,9 @@ struct ceph_file_layout {
 	__le32 fl_pg_pool;      /* namespace, crush ruleset, rep level */
 } __attribute__ ((packed));
 
+#define CEPH_MIN_STRIPE_UNIT 65536
 
+int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
 
 
 /*********************************************