LU-9367 llite: restore ll_file_getstripe in ll_lov_setstripe

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

diff --git a/lustre/include/lustre_lmv.h b/lustre/include/lustre_lmv.h
index a85c6d7..f936973 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
@@ -36,7 +36,7 @@
 
 struct lmv_oinfo {
        struct lu_fid   lmo_fid;
-       mdsno_t         lmo_mds;
+       u32             lmo_mds;
        struct inode    *lmo_root;
 };
 
@@ -48,16 +48,132 @@ struct lmv_stripe_md {
        __u32   lsm_md_layout_version;
        __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];
 };
 
+static inline bool
+lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
+{
+       __u32 idx;
+
+       if (lsm1->lsm_md_magic != lsm2->lsm_md_magic ||
+           lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count ||
+           lsm1->lsm_md_master_mdt_index !=
+                               lsm2->lsm_md_master_mdt_index ||
+           lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
+           lsm1->lsm_md_layout_version !=
+                               lsm2->lsm_md_layout_version ||
+           strcmp(lsm1->lsm_md_pool_name,
+                     lsm2->lsm_md_pool_name) != 0)
+               return false;
+
+       for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
+               if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid,
+                              &lsm2->lsm_md_oinfo[idx].lmo_fid))
+                       return false;
+       }
+
+       return true;
+}
 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,
+                     struct lu_dirent *ent, struct lu_buf *buf,
+                     bool resize);
+
+static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst,
+                                 const struct lmv_mds_md_v1 *lmv_src)
+{
+       __u32 i;
+
+       lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic);
+       lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count);
+       lmv_dst->lmv_master_mdt_index =
+                               le32_to_cpu(lmv_src->lmv_master_mdt_index);
+       lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type);
+       lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version);
+       for (i = 0; i < lmv_src->lmv_stripe_count; i++)
+               fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i],
+                             &lmv_src->lmv_stripe_fids[i]);
+}
+
+static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
+                                const union lmv_mds_md *lmv_src)
+{
+       switch (le32_to_cpu(lmv_src->lmv_magic)) {
+       case LMV_MAGIC_V1:
+               lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
+               break;
+       default:
+               break;
+       }
+}
+
+/* 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;
+       __u32   hash_type = lmv_hash_type & LMV_HASH_TYPE_MASK;
+
+       LASSERT(namelen > 0);
+       if (stripe_count <= 1)
+               return 0;
+
+       /* for migrating object, always start from 0 stripe */
+       if (lmv_hash_type & LMV_HASH_FLAG_MIGRATION)
+               return 0;
+
+       switch (hash_type) {
+       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 %d idx %d\n", namelen, name,
+              hash_type, idx);
+
+       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