LU-4684 migrate: migrate striped directory

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

diff --git a/lustre/include/lustre_lmv.h b/lustre/include/lustre_lmv.h
index 9dced71..e797e77 100644 (file)
--- a/lustre/include/lustre_lmv.h
+++ b/lustre/include/lustre_lmv.h
@@ -20,7 +20,7 @@
  * GPL HEADER END
  */
 /*
- * Copyright (c) 2013, Intel Corporation.
+ * Copyright (c) 2014, 2016, Intel Corporation.
  */
 /*
  * lustre/include/lustre_lmv.h
@@ -32,7 +32,7 @@
 
 #ifndef _LUSTRE_LMV_H
 #define _LUSTRE_LMV_H
-#include <lustre/lustre_idl.h>
+#include <uapi/linux/lustre/lustre_idl.h>
 
 struct lmv_oinfo {
        struct lu_fid   lmo_fid;
@@ -46,9 +46,11 @@ struct lmv_stripe_md {
        __u32   lsm_md_master_mdt_index;
        __u32   lsm_md_hash_type;
        __u32   lsm_md_layout_version;
+       __u32   lsm_md_migrate_offset;
+       __u32   lsm_md_migrate_hash;
        __u32   lsm_md_default_count;
        __u32   lsm_md_default_index;
-       char    lsm_md_pool_name[LOV_MAXPOOLNAME];
+       char    lsm_md_pool_name[LOV_MAXPOOLNAME + 1];
        struct lmv_oinfo lsm_md_oinfo[0];
 };
 
@@ -64,6 +66,10 @@ lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
            lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
            lsm1->lsm_md_layout_version !=
                                lsm2->lsm_md_layout_version ||
+           lsm1->lsm_md_migrate_offset !=
+                               lsm2->lsm_md_migrate_offset ||
+           lsm1->lsm_md_migrate_hash !=
+                               lsm2->lsm_md_migrate_hash ||
            strcmp(lsm1->lsm_md_pool_name,
                      lsm2->lsm_md_pool_name) != 0)
                return false;
@@ -78,11 +84,6 @@ lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
 }
 union lmv_mds_md;
 
-int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
-                      int stripe_count);
-int lmv_alloc_md(union lmv_mds_md **lmmp, int stripe_count);
-void lmv_free_md(union lmv_mds_md *lmm);
-int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripe_count);
 void lmv_free_memmd(struct lmv_stripe_md *lsm);
 
 int lmvea_load_shards(const struct lu_env *env, struct dt_object *obj,
@@ -117,4 +118,64 @@ static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
        }
 }
 
+/* This hash is only for testing purpose */
+static inline unsigned int
+lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
+{
+       unsigned int c = 0;
+       const unsigned char *p = (const unsigned char *)name;
+
+       while (--namelen >= 0)
+               c += p[namelen];
+
+       c = c % count;
+
+       return c;
+}
+
+static inline unsigned int
+lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
+{
+       __u64 hash;
+
+       hash = lustre_hash_fnv_1a_64(name, namelen);
+
+       return do_div(hash, count);
+}
+
+static inline int lmv_name_to_stripe_index(__u32 lmv_hash_type,
+                                          unsigned int stripe_count,
+                                          const char *name, int namelen)
+{
+       int idx;
+
+       LASSERT(namelen > 0);
+
+       if (stripe_count <= 1)
+               return 0;
+
+       switch (lmv_hash_type & LMV_HASH_TYPE_MASK) {
+       case LMV_HASH_TYPE_ALL_CHARS:
+               idx = lmv_hash_all_chars(stripe_count, name, namelen);
+               break;
+       case LMV_HASH_TYPE_FNV_1A_64:
+               idx = lmv_hash_fnv1a(stripe_count, name, namelen);
+               break;
+       default:
+               idx = -EBADFD;
+               break;
+       }
+
+       CDEBUG(D_INFO, "name %.*s hash_type %#x idx %d/%u\n", namelen, name,
+              lmv_hash_type, idx, stripe_count);
+
+       return idx;
+}
+
+static inline bool lmv_is_known_hash_type(__u32 type)
+{
+       return (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_FNV_1A_64 ||
+              (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_ALL_CHARS;
+}
+
 #endif