LU-4941 lfsck: check LOV EA header properly

[fs/lustre-release.git] / lustre / include / lustre / lustre_idl.h

diff --git a/lustre/include/lustre/lustre_idl.h b/lustre/include/lustre/lustre_idl.h
index b906810..b27d33f 100644 (file)
--- a/lustre/include/lustre/lustre_idl.h
+++ b/lustre/include/lustre/lustre_idl.h
@@ -1578,11 +1578,21 @@ enum obdo_flags {
         OBD_FL_LOCAL_MASK   = 0xF0000000,
 };
 
-#define LOV_MAGIC_V1      0x0BD10BD0
-#define LOV_MAGIC         LOV_MAGIC_V1
-#define LOV_MAGIC_JOIN_V1 0x0BD20BD0
-#define LOV_MAGIC_V3      0x0BD30BD0
-#define LOV_MAGIC_MIGRATE 0x0BD40BD0
+/*
+ * All LOV EA magics should have the same postfix, if some new version
+ * Lustre instroduces new LOV EA magic, then when down-grade to an old
+ * Lustre, even though the old version system does not recognizes such
+ * new magic, it still can distinguish the corrupted cases by checking
+ * the magic's postfix.
+ */
+#define LOV_MAGIC_MAGIC 0x0BD0
+#define LOV_MAGIC_MASK  0xFFFF
+
+#define LOV_MAGIC_V1           (0x0BD10000 | LOV_MAGIC_MAGIC)
+#define LOV_MAGIC_JOIN_V1      (0x0BD20000 | LOV_MAGIC_MAGIC)
+#define LOV_MAGIC_V3           (0x0BD30000 | LOV_MAGIC_MAGIC)
+#define LOV_MAGIC_MIGRATE      (0x0BD40000 | LOV_MAGIC_MAGIC)
+#define LOV_MAGIC              LOV_MAGIC_V1
 
 /*
  * magic for fully defined striping
@@ -1699,6 +1709,12 @@ static inline void lmm_oi_cpu_to_le(struct ost_id *dst_oi,
 #define MAX_MD_SIZE (sizeof(struct lov_mds_md) + 4 * sizeof(struct lov_ost_data))
 #define MIN_MD_SIZE (sizeof(struct lov_mds_md) + 1 * sizeof(struct lov_ost_data))
 
+/* This is the default MDT reply size allocated, should the striping be bigger,
+ * it will be reallocated in mdt_fix_reply.
+ * 100 stripes is a bit less than 2.5k of data */
+#define DEF_REP_MD_SIZE (sizeof(struct lov_mds_md) + \
+                        100 * sizeof(struct lov_ost_data))
+
 #define XATTR_NAME_ACL_ACCESS   "system.posix_acl_access"
 #define XATTR_NAME_ACL_DEFAULT  "system.posix_acl_default"
 #define XATTR_USER_PREFIX       "user."
@@ -1716,6 +1732,7 @@ static inline void lmm_oi_cpu_to_le(struct ost_id *dst_oi,
 #define XATTR_NAME_SOM         "trusted.som"
 #define XATTR_NAME_HSM         "trusted.hsm"
 #define XATTR_NAME_LFSCK_NAMESPACE "trusted.lfsck_namespace"
+#define XATTR_NAME_MAX_LEN     32 /* increase this, if there is longer name. */
 
 struct lov_mds_md_v3 {            /* LOV EA mds/wire data (little-endian) */
        __u32 lmm_magic;          /* magic number = LOV_MAGIC_V3 */