4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details. A copy is
14 * included in the COPYING file that accompanied this code.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Copyright (c) 2014, 2016, Intel Corporation.
26 * lustre/include/lustre_lmv.h
28 * Lustre LMV structures and functions.
30 * Author: Di Wang <di.wang@intel.com>
35 #include <uapi/linux/lustre/lustre_idl.h>
38 struct lu_fid lmo_fid;
40 struct inode *lmo_root;
43 struct lmv_stripe_md {
45 __u32 lsm_md_stripe_count;
46 __u32 lsm_md_master_mdt_index;
47 __u32 lsm_md_hash_type;
48 __u32 lsm_md_layout_version;
49 __u32 lsm_md_migrate_offset;
50 __u32 lsm_md_migrate_hash;
51 __u32 lsm_md_default_count;
52 __u32 lsm_md_default_index;
53 char lsm_md_pool_name[LOV_MAXPOOLNAME + 1];
54 struct lmv_oinfo lsm_md_oinfo[0];
57 static inline bool lmv_dir_striped(const struct lmv_stripe_md *lsm)
59 return lsm && lsm->lsm_md_magic == LMV_MAGIC;
62 static inline bool lmv_dir_foreign(const struct lmv_stripe_md *lsm)
64 return lsm && lsm->lsm_md_magic == LMV_MAGIC_FOREIGN;
67 static inline bool lmv_dir_migrating(const struct lmv_stripe_md *lsm)
69 return lmv_dir_striped(lsm) &&
70 lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION;
73 static inline bool lmv_dir_bad_hash(const struct lmv_stripe_md *lsm)
75 if (!lmv_dir_striped(lsm))
78 if (lmv_dir_migrating(lsm) &&
79 lsm->lsm_md_stripe_count - lsm->lsm_md_migrate_offset <= 1)
82 return !lmv_is_known_hash_type(lsm->lsm_md_hash_type);
86 lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
90 if (lsm1->lsm_md_magic != lsm2->lsm_md_magic ||
91 lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count ||
92 lsm1->lsm_md_master_mdt_index !=
93 lsm2->lsm_md_master_mdt_index ||
94 lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
95 lsm1->lsm_md_layout_version !=
96 lsm2->lsm_md_layout_version ||
97 lsm1->lsm_md_migrate_offset !=
98 lsm2->lsm_md_migrate_offset ||
99 lsm1->lsm_md_migrate_hash !=
100 lsm2->lsm_md_migrate_hash ||
101 strncmp(lsm1->lsm_md_pool_name, lsm2->lsm_md_pool_name,
102 sizeof(lsm1->lsm_md_pool_name)) != 0)
105 if (lmv_dir_striped(lsm1)) {
106 for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
107 if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid,
108 &lsm2->lsm_md_oinfo[idx].lmo_fid))
116 static inline void lsm_md_dump(int mask, const struct lmv_stripe_md *lsm)
120 /* If lsm_md_magic == LMV_MAGIC_FOREIGN pool_name may not be a null
121 * terminated string so only print LOV_MAXPOOLNAME bytes.
124 "magic %#x stripe count %d master mdt %d hash type %#x version %d migrate offset %d migrate hash %#x pool %.*s\n",
125 lsm->lsm_md_magic, lsm->lsm_md_stripe_count,
126 lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
127 lsm->lsm_md_layout_version, lsm->lsm_md_migrate_offset,
128 lsm->lsm_md_migrate_hash,
129 LOV_MAXPOOLNAME, lsm->lsm_md_pool_name);
131 if (!lmv_dir_striped(lsm))
134 for (i = 0; i < lsm->lsm_md_stripe_count; i++)
135 CDEBUG(mask, "stripe[%d] "DFID"\n",
136 i, PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
141 void lmv_free_memmd(struct lmv_stripe_md *lsm);
143 static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst,
144 const struct lmv_mds_md_v1 *lmv_src)
148 lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic);
149 lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count);
150 lmv_dst->lmv_master_mdt_index =
151 le32_to_cpu(lmv_src->lmv_master_mdt_index);
152 lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type);
153 lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version);
154 for (i = 0; i < lmv_src->lmv_stripe_count; i++)
155 fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i],
156 &lmv_src->lmv_stripe_fids[i]);
159 static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
160 const union lmv_mds_md *lmv_src)
162 switch (le32_to_cpu(lmv_src->lmv_magic)) {
164 lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
171 /* This hash is only for testing purpose */
172 static inline unsigned int
173 lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
176 const unsigned char *p = (const unsigned char *)name;
178 while (--namelen >= 0)
186 static inline unsigned int
187 lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
191 hash = lustre_hash_fnv_1a_64(name, namelen);
193 return do_div(hash, count);
196 static inline int lmv_name_to_stripe_index(__u32 lmv_hash_type,
197 unsigned int stripe_count,
198 const char *name, int namelen)
202 LASSERT(namelen > 0);
204 if (stripe_count <= 1)
207 switch (lmv_hash_type & LMV_HASH_TYPE_MASK) {
208 case LMV_HASH_TYPE_ALL_CHARS:
209 idx = lmv_hash_all_chars(stripe_count, name, namelen);
211 case LMV_HASH_TYPE_FNV_1A_64:
212 idx = lmv_hash_fnv1a(stripe_count, name, namelen);
219 CDEBUG(D_INFO, "name %.*s hash_type %#x idx %d/%u\n", namelen, name,
220 lmv_hash_type, idx, stripe_count);
225 static inline bool lmv_magic_supported(__u32 lum_magic)
227 return lum_magic == LMV_USER_MAGIC ||
228 lum_magic == LMV_USER_MAGIC_SPECIFIC ||
229 lum_magic == LMV_MAGIC_FOREIGN;