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
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14 * included in the COPYING file that accompanied this code.
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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 /* NB: LMV_HASH_TYPE_SPACE is set in default LMV only */
58 static inline bool lmv_is_known_hash_type(__u32 type)
60 return (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_FNV_1A_64 ||
61 (type & LMV_HASH_TYPE_MASK) == LMV_HASH_TYPE_ALL_CHARS;
64 static inline bool lmv_dir_striped(const struct lmv_stripe_md *lsm)
66 return lsm && lsm->lsm_md_magic == LMV_MAGIC;
69 static inline bool lmv_dir_foreign(const struct lmv_stripe_md *lsm)
71 return lsm && lsm->lsm_md_magic == LMV_MAGIC_FOREIGN;
74 static inline bool lmv_dir_migrating(const struct lmv_stripe_md *lsm)
76 return lmv_dir_striped(lsm) &&
77 lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION;
80 static inline bool lmv_dir_bad_hash(const struct lmv_stripe_md *lsm)
82 if (!lmv_dir_striped(lsm))
85 if (lmv_dir_migrating(lsm) &&
86 lsm->lsm_md_stripe_count - lsm->lsm_md_migrate_offset <= 1)
89 return !lmv_is_known_hash_type(lsm->lsm_md_hash_type);
92 /* NB, this is checking directory default LMV */
93 static inline bool lmv_dir_space_hashed(const struct lmv_stripe_md *lsm)
95 return lsm && lsm->lsm_md_hash_type == LMV_HASH_TYPE_SPACE;
99 lsm_md_eq(const struct lmv_stripe_md *lsm1, const struct lmv_stripe_md *lsm2)
103 if (lsm1->lsm_md_magic != lsm2->lsm_md_magic ||
104 lsm1->lsm_md_stripe_count != lsm2->lsm_md_stripe_count ||
105 lsm1->lsm_md_master_mdt_index !=
106 lsm2->lsm_md_master_mdt_index ||
107 lsm1->lsm_md_hash_type != lsm2->lsm_md_hash_type ||
108 lsm1->lsm_md_layout_version !=
109 lsm2->lsm_md_layout_version ||
110 lsm1->lsm_md_migrate_offset !=
111 lsm2->lsm_md_migrate_offset ||
112 lsm1->lsm_md_migrate_hash !=
113 lsm2->lsm_md_migrate_hash ||
114 strcmp(lsm1->lsm_md_pool_name,
115 lsm2->lsm_md_pool_name) != 0)
118 if (lmv_dir_striped(lsm1)) {
119 for (idx = 0; idx < lsm1->lsm_md_stripe_count; idx++) {
120 if (!lu_fid_eq(&lsm1->lsm_md_oinfo[idx].lmo_fid,
121 &lsm2->lsm_md_oinfo[idx].lmo_fid))
129 static inline void lsm_md_dump(int mask, const struct lmv_stripe_md *lsm)
133 CDEBUG(mask, "magic %#x stripe count %d master mdt %d hash type %#x "
134 "version %d migrate offset %d migrate hash %#x pool %s\n",
135 lsm->lsm_md_magic, lsm->lsm_md_stripe_count,
136 lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
137 lsm->lsm_md_layout_version, lsm->lsm_md_migrate_offset,
138 lsm->lsm_md_migrate_hash, lsm->lsm_md_pool_name);
140 if (!lmv_dir_striped(lsm))
143 for (i = 0; i < lsm->lsm_md_stripe_count; i++)
144 CDEBUG(mask, "stripe[%d] "DFID"\n",
145 i, PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
150 void lmv_free_memmd(struct lmv_stripe_md *lsm);
152 static inline void lmv1_le_to_cpu(struct lmv_mds_md_v1 *lmv_dst,
153 const struct lmv_mds_md_v1 *lmv_src)
157 lmv_dst->lmv_magic = le32_to_cpu(lmv_src->lmv_magic);
158 lmv_dst->lmv_stripe_count = le32_to_cpu(lmv_src->lmv_stripe_count);
159 lmv_dst->lmv_master_mdt_index =
160 le32_to_cpu(lmv_src->lmv_master_mdt_index);
161 lmv_dst->lmv_hash_type = le32_to_cpu(lmv_src->lmv_hash_type);
162 lmv_dst->lmv_layout_version = le32_to_cpu(lmv_src->lmv_layout_version);
163 for (i = 0; i < lmv_src->lmv_stripe_count; i++)
164 fid_le_to_cpu(&lmv_dst->lmv_stripe_fids[i],
165 &lmv_src->lmv_stripe_fids[i]);
168 static inline void lmv_le_to_cpu(union lmv_mds_md *lmv_dst,
169 const union lmv_mds_md *lmv_src)
171 switch (le32_to_cpu(lmv_src->lmv_magic)) {
173 lmv1_le_to_cpu(&lmv_dst->lmv_md_v1, &lmv_src->lmv_md_v1);
180 /* This hash is only for testing purpose */
181 static inline unsigned int
182 lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
185 const unsigned char *p = (const unsigned char *)name;
187 while (--namelen >= 0)
195 static inline unsigned int
196 lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
200 hash = lustre_hash_fnv_1a_64(name, namelen);
202 return do_div(hash, count);
205 static inline int lmv_name_to_stripe_index(__u32 lmv_hash_type,
206 unsigned int stripe_count,
207 const char *name, int namelen)
211 LASSERT(namelen > 0);
213 if (stripe_count <= 1)
216 switch (lmv_hash_type & LMV_HASH_TYPE_MASK) {
217 case LMV_HASH_TYPE_ALL_CHARS:
218 idx = lmv_hash_all_chars(stripe_count, name, namelen);
220 case LMV_HASH_TYPE_FNV_1A_64:
221 idx = lmv_hash_fnv1a(stripe_count, name, namelen);
228 CDEBUG(D_INFO, "name %.*s hash_type %#x idx %d/%u\n", namelen, name,
229 lmv_hash_type, idx, stripe_count);
234 static inline bool lmv_magic_supported(__u32 lum_magic)
236 return lum_magic == LMV_USER_MAGIC ||
237 lum_magic == LMV_USER_MAGIC_SPECIFIC ||
238 lum_magic == LMV_MAGIC_FOREIGN;