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14 * in the LICENSE file that accompanied this code).
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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, 2012, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/include/lustre_fid.h
38 * Author: Yury Umanets <umka@clusterfs.com>
52 #include <libcfs/libcfs.h>
53 #include <lustre/lustre_idl.h>
54 #include <lustre_req_layout.h>
55 #include <lustre_mdt.h>
61 /* Whole sequences space range and zero range definitions */
62 extern const struct lu_seq_range LUSTRE_SEQ_SPACE_RANGE;
63 extern const struct lu_seq_range LUSTRE_SEQ_ZERO_RANGE;
64 extern const struct lu_fid LUSTRE_BFL_FID;
65 extern const struct lu_fid LU_OBF_FID;
66 extern const struct lu_fid LU_DOT_LUSTRE_FID;
70 * This is how may FIDs may be allocated in one sequence(128k)
72 LUSTRE_SEQ_MAX_WIDTH = 0x0000000000020000ULL,
75 * How many sequences to allocate to a client at once.
77 LUSTRE_SEQ_META_WIDTH = 0x0000000000000001ULL,
80 * seq allocation pool size.
82 LUSTRE_SEQ_BATCH_WIDTH = LUSTRE_SEQ_META_WIDTH * 1000,
85 * This is how many sequences may be in one super-sequence allocated to
88 LUSTRE_SEQ_SUPER_WIDTH = ((1ULL << 30ULL) * LUSTRE_SEQ_META_WIDTH)
92 /** 2^6 FIDs for OI containers */
93 OSD_OI_FID_OID_BITS = 6,
94 /** reserve enough FIDs in case we want more in the future */
95 OSD_OI_FID_OID_BITS_MAX = 10,
98 /** special OID for local objects */
100 /** \see fld_mod_init */
102 /** \see fid_mod_init */
103 FID_SEQ_CTL_OID = 4UL,
104 FID_SEQ_SRV_OID = 5UL,
105 /** \see mdd_mod_init */
106 MDD_ROOT_INDEX_OID = 6UL,
107 MDD_ORPHAN_OID = 7UL,
108 MDD_LOV_OBJ_OID = 8UL,
109 MDD_CAPA_KEYS_OID = 9UL,
110 /** \see mdt_mod_init */
111 MDT_LAST_RECV_OID = 11UL,
112 OSD_FS_ROOT_OID = 13UL,
113 ACCT_USER_OID = 15UL,
114 ACCT_GROUP_OID = 16UL,
115 OFD_LAST_RECV_OID = 19UL,
116 OFD_GROUP0_LAST_OID = 20UL,
117 OFD_GROUP4K_LAST_OID = 20UL+4096,
118 OFD_LAST_GROUP_OID = 4117UL,
119 LLOG_CATALOGS_OID = 4118UL,
120 MGS_CONFIGS_OID = 4119UL,
121 OFD_HEALTH_CHECK_OID = 4120UL,
124 static inline void lu_local_obj_fid(struct lu_fid *fid, __u32 oid)
126 fid->f_seq = FID_SEQ_LOCAL_FILE;
133 LUSTRE_SEQ_CONTROLLER
141 struct lu_server_seq;
143 /* Client sequence manager interface. */
144 struct lu_client_seq {
145 /* Sequence-controller export. */
146 struct obd_export *lcs_exp;
147 cfs_mutex_t lcs_mutex;
150 * Range of allowed for allocation sequeces. When using lu_client_seq on
151 * clients, this contains meta-sequence range. And for servers this
152 * contains super-sequence range.
154 struct lu_seq_range lcs_space;
156 /* Seq related proc */
157 cfs_proc_dir_entry_t *lcs_proc_dir;
159 /* This holds last allocated fid in last obtained seq */
160 struct lu_fid lcs_fid;
162 /* LUSTRE_SEQ_METADATA or LUSTRE_SEQ_DATA */
163 enum lu_cli_type lcs_type;
166 * Service uuid, passed from MDT + seq name to form unique seq name to
167 * use it with procfs.
172 * Sequence width, that is how many objects may be allocated in one
173 * sequence. Default value for it is LUSTRE_SEQ_MAX_WIDTH.
177 /* Seq-server for direct talking */
178 struct lu_server_seq *lcs_srv;
180 /* wait queue for fid allocation and update indicator */
181 cfs_waitq_t lcs_waitq;
185 /* server sequence manager interface */
186 struct lu_server_seq {
187 /* Available sequences space */
188 struct lu_seq_range lss_space;
190 /* keeps highwater in lsr_end for seq allocation algorithm */
191 struct lu_seq_range lss_lowater_set;
192 struct lu_seq_range lss_hiwater_set;
195 * Device for server side seq manager needs (saving sequences to backing
198 struct dt_device *lss_dev;
200 /* /seq file object device */
201 struct dt_object *lss_obj;
203 /* Seq related proc */
204 cfs_proc_dir_entry_t *lss_proc_dir;
206 /* LUSTRE_SEQ_SERVER or LUSTRE_SEQ_CONTROLLER */
207 enum lu_mgr_type lss_type;
209 /* Client interafce to request controller */
210 struct lu_client_seq *lss_cli;
212 /* Mutex for protecting allocation */
213 cfs_mutex_t lss_mutex;
216 * Service uuid, passed from MDT + seq name to form unique seq name to
217 * use it with procfs.
222 * Allocation chunks for super and meta sequences. Default values are
223 * LUSTRE_SEQ_SUPER_WIDTH and LUSTRE_SEQ_META_WIDTH.
228 * minimum lss_alloc_set size that should be allocated from
233 /* sync is needed for update operation */
236 * Pointer to site object, required to access site fld.
238 struct md_site *lss_site;
241 int seq_query(struct com_thread_info *info);
244 int seq_server_init(struct lu_server_seq *seq,
245 struct dt_device *dev,
247 enum lu_mgr_type type,
249 const struct lu_env *env);
251 void seq_server_fini(struct lu_server_seq *seq,
252 const struct lu_env *env);
254 int seq_server_alloc_super(struct lu_server_seq *seq,
255 struct lu_seq_range *out,
256 const struct lu_env *env);
258 int seq_server_alloc_meta(struct lu_server_seq *seq,
259 struct lu_seq_range *out,
260 const struct lu_env *env);
262 int seq_server_set_cli(struct lu_server_seq *seq,
263 struct lu_client_seq *cli,
264 const struct lu_env *env);
267 int seq_client_init(struct lu_client_seq *seq,
268 struct obd_export *exp,
269 enum lu_cli_type type,
271 struct lu_server_seq *srv);
273 void seq_client_fini(struct lu_client_seq *seq);
275 void seq_client_flush(struct lu_client_seq *seq);
277 int seq_client_alloc_fid(const struct lu_env *env, struct lu_client_seq *seq,
279 int seq_client_get_seq(const struct lu_env *env, struct lu_client_seq *seq,
282 /* Fids common stuff */
283 int fid_is_local(const struct lu_env *env,
284 struct lu_site *site, const struct lu_fid *fid);
288 struct ldlm_namespace;
291 * Build (DLM) resource name from FID.
293 * NOTE: until Lustre 1.8.7/2.1.1 the fid_ver() was packed into name[2],
294 * but was moved into name[1] along with the OID to avoid consuming the
295 * renaming name[2,3] fields that need to be used for the quota identifier.
297 static inline struct ldlm_res_id *
298 fid_build_reg_res_name(const struct lu_fid *f,
299 struct ldlm_res_id *name)
301 memset(name, 0, sizeof *name);
302 name->name[LUSTRE_RES_ID_SEQ_OFF] = fid_seq(f);
303 name->name[LUSTRE_RES_ID_VER_OID_OFF] = fid_ver_oid(f);
308 * Return true if resource is for object identified by fid.
310 static inline int fid_res_name_eq(const struct lu_fid *f,
311 const struct ldlm_res_id *name)
313 return name->name[LUSTRE_RES_ID_SEQ_OFF] == fid_seq(f) &&
314 name->name[LUSTRE_RES_ID_VER_OID_OFF] == fid_ver_oid(f);
318 static inline struct ldlm_res_id *
319 fid_build_pdo_res_name(const struct lu_fid *f,
321 struct ldlm_res_id *name)
323 fid_build_reg_res_name(f, name);
324 name->name[LUSTRE_RES_ID_HSH_OFF] = hash;
330 * Flatten 128-bit FID values into a 64-bit value for use as an inode number.
331 * For non-IGIF FIDs this starts just over 2^32, and continues without
332 * conflict until 2^64, at which point we wrap the high 24 bits of the SEQ
333 * into the range where there may not be many OID values in use, to minimize
334 * the risk of conflict.
336 * Suppose LUSTRE_SEQ_MAX_WIDTH less than (1 << 24) which is currently true,
337 * the time between re-used inode numbers is very long - 2^40 SEQ numbers,
338 * or about 2^40 client mounts, if clients create less than 2^24 files/mount.
340 static inline __u64 fid_flatten(const struct lu_fid *fid)
345 if (fid_is_igif(fid)) {
346 ino = lu_igif_ino(fid);
352 ino = (seq << 24) + ((seq >> 24) & 0xffffff0000ULL) + fid_oid(fid);
354 RETURN(ino ? ino : fid_oid(fid));
357 static inline __u32 fid_hash(const struct lu_fid *f, int bits)
359 /* all objects with same id and different versions will belong to same
360 * collisions list. */
361 return cfs_hash_long(fid_flatten(f), bits);
365 * map fid to 32 bit value for ino on 32bit systems. */
366 static inline __u32 fid_flatten32(const struct lu_fid *fid)
371 if (fid_is_igif(fid)) {
372 ino = lu_igif_ino(fid);
376 seq = fid_seq(fid) - FID_SEQ_START;
378 /* Map the high bits of the OID into higher bits of the inode number so
379 * that inodes generated at about the same time have a reduced chance
380 * of collisions. This will give a period of 2^12 = 1024 unique clients
381 * (from SEQ) and up to min(LUSTRE_SEQ_MAX_WIDTH, 2^20) = 128k objects
382 * (from OID), or up to 128M inodes without collisions for new files. */
383 ino = ((seq & 0x000fffffULL) << 12) + ((seq >> 8) & 0xfffff000) +
384 (seq >> (64 - (40-8)) & 0xffffff00) +
385 (fid_oid(fid) & 0xff000fff) + ((fid_oid(fid) & 0x00fff000) << 8);
387 RETURN(ino ? ino : fid_oid(fid));
390 #define LUSTRE_SEQ_SRV_NAME "seq_srv"
391 #define LUSTRE_SEQ_CTL_NAME "seq_ctl"
393 /* Range common stuff */
394 static inline void range_cpu_to_le(struct lu_seq_range *dst, const struct lu_seq_range *src)
396 dst->lsr_start = cpu_to_le64(src->lsr_start);
397 dst->lsr_end = cpu_to_le64(src->lsr_end);
398 dst->lsr_index = cpu_to_le32(src->lsr_index);
399 dst->lsr_flags = cpu_to_le32(src->lsr_flags);
402 static inline void range_le_to_cpu(struct lu_seq_range *dst, const struct lu_seq_range *src)
404 dst->lsr_start = le64_to_cpu(src->lsr_start);
405 dst->lsr_end = le64_to_cpu(src->lsr_end);
406 dst->lsr_index = le32_to_cpu(src->lsr_index);
407 dst->lsr_flags = le32_to_cpu(src->lsr_flags);
410 static inline void range_cpu_to_be(struct lu_seq_range *dst, const struct lu_seq_range *src)
412 dst->lsr_start = cpu_to_be64(src->lsr_start);
413 dst->lsr_end = cpu_to_be64(src->lsr_end);
414 dst->lsr_index = cpu_to_be32(src->lsr_index);
415 dst->lsr_flags = cpu_to_be32(src->lsr_flags);
418 static inline void range_be_to_cpu(struct lu_seq_range *dst, const struct lu_seq_range *src)
420 dst->lsr_start = be64_to_cpu(src->lsr_start);
421 dst->lsr_end = be64_to_cpu(src->lsr_end);
422 dst->lsr_index = be32_to_cpu(src->lsr_index);
423 dst->lsr_flags = be32_to_cpu(src->lsr_flags);
428 #endif /* __LINUX_FID_H */