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, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
36 /** \defgroup llapi llapi
46 #include <sys/types.h>
47 #include <linux/lustre/lustre_user.h>
49 #if defined(__cplusplus)
54 #define LL_MAXQUOTAS 3
58 #define ARRAY_SIZE(a) ((sizeof(a)) / (sizeof((a)[0])))
61 #define lustre_fid struct lu_fid
63 /* Currently external applications can access this but in the
64 * future this will no longer be exposed for the user. Instead
65 * if you want to know if the library is initialized just call
66 * llapi_liblustreapi_initialized() which is now available. */
67 extern bool liblustreapi_initialized;
69 typedef void (*llapi_cb_t)(char *obd_type_name, char *obd_name, char *obd_uuid,
72 /* lustreapi message severity level */
73 enum llapi_message_level {
84 typedef void (*llapi_log_callback_t)(enum llapi_message_level level, int err,
85 const char *fmt, va_list ap);
87 static inline bool llapi_liblustreapi_initialized(void)
89 return liblustreapi_initialized;
92 /* the bottom three bits reserved for llapi_message_level */
93 #define LLAPI_MSG_MASK 0x00000007
94 #define LLAPI_MSG_NO_ERRNO 0x00000010
96 static inline const char *llapi_msg_level2str(enum llapi_message_level level)
98 static const char *levels[LLAPI_MSG_MAX] = {"OFF", "FATAL", "ERROR",
102 if (level >= LLAPI_MSG_MAX)
105 return levels[level];
108 void llapi_msg_set_level(int level);
109 int llapi_msg_get_level(void);
110 llapi_log_callback_t llapi_error_callback_set(llapi_log_callback_t cb);
111 llapi_log_callback_t llapi_info_callback_set(llapi_log_callback_t cb);
113 void llapi_error(enum llapi_message_level level, int err, const char *fmt, ...)
114 __attribute__((__format__(__printf__, 3, 4)));
115 #define llapi_err_noerrno(level, fmt, a...) \
116 llapi_error((level) | LLAPI_MSG_NO_ERRNO, 0, fmt, ## a)
117 void llapi_printf(enum llapi_message_level level, const char *fmt, ...)
118 __attribute__((__format__(__printf__, 2, 3)));
120 struct llapi_stripe_param {
121 unsigned long long lsp_stripe_size;
123 int lsp_stripe_offset;
124 int lsp_stripe_pattern;
125 /* Number of stripes. Size of lsp_osts[] if lsp_specific is true.*/
126 int lsp_stripe_count;
127 bool lsp_is_specific;
131 #define lsp_tgts lsp_osts
133 __u32 llapi_pattern_to_lov(uint64_t pattern);
135 int llapi_file_open_param(const char *name, int flags, mode_t mode,
136 const struct llapi_stripe_param *param);
137 int llapi_file_create_foreign(const char *name, mode_t mode, __u32 type,
138 __u32 flags, char *foreign_lov);
139 int llapi_file_create(const char *name, unsigned long long stripe_size,
140 int stripe_offset, int stripe_count, int stripe_pattern);
141 int llapi_file_open(const char *name, int flags, int mode,
142 unsigned long long stripe_size, int stripe_offset,
143 int stripe_count, int stripe_pattern);
144 int llapi_file_create_pool(const char *name, unsigned long long stripe_size,
145 int stripe_offset, int stripe_count,
146 int stripe_pattern, char *pool_name);
147 int llapi_file_open_pool(const char *name, int flags, int mode,
148 unsigned long long stripe_size, int stripe_offset,
149 int stripe_count, int stripe_pattern, char *pool_name);
150 int llapi_poollist(const char *name);
151 int llapi_get_poollist(const char *name, char **poollist, int list_size,
152 char *buffer, int buffer_size);
153 int llapi_get_poolmembers(const char *poolname, char **members, int list_size,
154 char *buffer, int buffer_size);
155 int llapi_file_get_stripe(const char *path, struct lov_user_md *lum);
156 int llapi_file_lookup(int dirfd, const char *name);
157 void llapi_set_command_name(const char *cmd);
158 void llapi_clear_command_name(void);
160 enum llapi_layout_verbose {
161 VERBOSE_STRIPE_COUNT = 0x1,
162 VERBOSE_STRIPE_SIZE = 0x2,
163 VERBOSE_STRIPE_OFFSET = 0x4,
165 VERBOSE_DETAIL = 0x10,
166 VERBOSE_OBJID = 0x20,
167 VERBOSE_GENERATION = 0x40,
168 VERBOSE_MDTINDEX = 0x80,
169 VERBOSE_PATTERN = 0x100,
170 VERBOSE_COMP_COUNT = 0x200,
171 VERBOSE_COMP_FLAGS = 0x400,
172 VERBOSE_COMP_START = 0x800,
173 VERBOSE_COMP_END = 0x1000,
174 VERBOSE_COMP_ID = 0x2000,
175 VERBOSE_DFID = 0x4000,
176 VERBOSE_HASH_TYPE = 0x8000,
177 VERBOSE_MIRROR_COUNT = 0x10000,
178 VERBOSE_MIRROR_ID = 0x20000,
179 VERBOSE_EXT_SIZE = 0x40000,
180 VERBOSE_DEFAULT = VERBOSE_STRIPE_COUNT | VERBOSE_STRIPE_SIZE |
181 VERBOSE_STRIPE_OFFSET | VERBOSE_POOL |
182 VERBOSE_OBJID | VERBOSE_GENERATION |
183 VERBOSE_PATTERN | VERBOSE_HASH_TYPE |
184 VERBOSE_COMP_COUNT | VERBOSE_COMP_FLAGS |
185 VERBOSE_COMP_START | VERBOSE_COMP_END |
186 VERBOSE_COMP_ID | VERBOSE_MIRROR_COUNT |
187 VERBOSE_MIRROR_ID | VERBOSE_EXT_SIZE
189 /* Compatibility with original names */
190 #define VERBOSE_SIZE VERBOSE_STRIPE_SIZE
191 #define VERBOSE_COUNT VERBOSE_STRIPE_COUNT
192 #define VERBOSE_OFFSET VERBOSE_STRIPE_OFFSET
193 #define VERBOSE_LAYOUT VERBOSE_PATTERN
196 NEWERXY_ATIME = 0, /* neweraY */
197 NEWERXY_MTIME = 1, /* newermY */
198 NEWERXY_CTIME = 2, /* newercY */
203 unsigned int fp_max_depth;
205 mode_t fp_type; /* S_IFIFO,... */
211 /* {a,m,c}sign cannot be bitfields due to using pointers to
212 * access them during argument parsing. */
216 /* these need to be signed values */
218 fp_stripe_size_sign:2,
219 fp_stripe_count_sign:2,
220 fp_comp_start_sign:2,
222 fp_comp_count_sign:2,
223 fp_mirror_count_sign:2,
224 fp_mirror_index_sign:2,
229 fp_unused1_sign:2, /* Fields available to use*/
230 fp_unused2_sign:2, /* Once used we must add */
231 fp_unused3_sign:2, /* a separate flag field */
232 fp_unused4_sign:2; /* at end of the struct. */
233 unsigned long long fp_size;
234 unsigned long long fp_size_units;
236 unsigned long long fp_zero_end:1,
238 fp_exclude_pattern:1,
246 fp_check_pool:1, /* LOV pool name */
247 fp_check_size:1, /* file size */
253 fp_get_lmv:1, /* get MDT list from LMV */
254 fp_raw:1, /* do not fill in defaults */
255 fp_check_stripe_size:1, /* LOV stripe size */
256 fp_exclude_stripe_size:1,
257 fp_check_stripe_count:1, /* LOV stripe count */
258 fp_exclude_stripe_count:1,
261 fp_get_default_lmv:1, /* Get default LMV */
265 fp_check_comp_count:1,
266 fp_exclude_comp_count:1,
267 fp_check_mirror_count:1,
268 fp_exclude_mirror_count:1,
269 fp_check_comp_flags:1,
270 fp_check_mirror_state:1,
271 fp_check_comp_start:1,
272 fp_exclude_comp_start:1,
274 fp_exclude_comp_end:1,
276 fp_exclude_comp_id:1,
277 fp_check_mirror_id:1,
278 fp_exclude_mirror_id:1,
279 fp_check_mirror_index:1,
280 fp_exclude_mirror_index:1,
281 fp_check_mdt_count:1,
282 fp_exclude_mdt_count:1,
283 fp_check_hash_type:1,
284 fp_exclude_hash_type:1,
285 fp_yaml:1, /* output layout in YAML */
289 fp_exclude_foreign:1,
290 fp_check_ext_size:1, /* extension size */
291 fp_exclude_ext_size:1,
294 fp_unused_bit2:1, /* All of these unused bit */
295 fp_unused_bit3:1, /* fields available to use.*/
296 fp_unused_bit4:1, /* Once all unused fields */
297 fp_unused_bit5:1, /* are used we need to add */
298 fp_unused_bit6:1, /* a separate flag field at*/
299 fp_unused_bit7:1; /* the end of the struct. */
301 enum llapi_layout_verbose fp_verbose;
304 /* regular expression */
307 struct obd_uuid *fp_obd_uuid;
309 int fp_num_alloc_obds;
313 struct obd_uuid *fp_mdt_uuid;
315 int fp_num_alloc_mdts;
318 int fp_file_mdt_index;
321 struct lov_user_mds_data *fp_lmd;
323 char fp_poolname[LOV_MAXPOOLNAME + 1];
325 __u32 fp_lmv_stripe_count;
326 struct lmv_user_md *fp_lmv_md;
328 unsigned long long fp_stripe_size;
329 unsigned long long fp_stripe_size_units;
330 unsigned long long fp_stripe_count;
334 __u32 fp_mirror_count;
336 __u32 fp_comp_neg_flags;
337 __u16 fp_mirror_state;
338 __u16 fp_mirror_neg_state;
341 __u16 fp_mirror_index;
342 unsigned long long fp_comp_start;
343 unsigned long long fp_comp_start_units;
344 unsigned long long fp_comp_end;
345 unsigned long long fp_comp_end_units;
346 unsigned long long fp_mdt_count;
348 unsigned long long fp_blocks;
349 unsigned long long fp_blocks_units;
351 unsigned long fp_got_uuids:1,
353 unsigned int fp_depth;
354 unsigned int fp_hash_type;
355 unsigned int fp_time_margin; /* time margin in seconds */
356 __u32 fp_foreign_type;
357 unsigned long long fp_ext_size;
358 unsigned long long fp_ext_size_units;
361 * fp_newery[NEWERXY_MAX][0]: --newerXY reference
362 * fp_newery[NEWERXY_MAX][1]: ! -- newerXY reference
364 time_t fp_newery[NEWERXY_MAX][2];
367 int llapi_ostlist(char *path, struct find_param *param);
368 int llapi_uuid_match(char *real_uuid, char *search_uuid);
369 int llapi_getstripe(char *path, struct find_param *param);
370 int llapi_find(char *path, struct find_param *param);
372 int llapi_file_fget_mdtidx(int fd, int *mdtidx);
373 int llapi_dir_set_default_lmv(const char *name,
374 const struct llapi_stripe_param *param);
375 int llapi_dir_set_default_lmv_stripe(const char *name, int stripe_offset,
376 int stripe_count, int stripe_pattern,
377 const char *pool_name);
378 int llapi_dir_create(const char *name, mode_t mode,
379 const struct llapi_stripe_param *param);
380 int llapi_dir_create_foreign(const char *name, mode_t mode, __u32 type,
381 __u32 flags, const char *value);
382 int llapi_dir_create_pool(const char *name, int flags, int stripe_offset,
383 int stripe_count, int stripe_pattern,
384 const char *poolname);
385 int llapi_direntry_remove(char *dname);
387 int llapi_obd_fstatfs(int fd, __u32 type, __u32 index,
388 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
389 int llapi_obd_statfs(char *path, __u32 type, __u32 index,
390 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
391 int llapi_ping(char *obd_type, char *obd_name);
392 int llapi_target_check(int num_types, char **obd_types, char *dir);
393 int llapi_file_get_lov_uuid(const char *path, struct obd_uuid *lov_uuid);
394 int llapi_file_get_lmv_uuid(const char *path, struct obd_uuid *lmv_uuid);
395 int llapi_file_fget_lov_uuid(int fd, struct obd_uuid *lov_uuid);
396 int llapi_lov_get_uuids(int fd, struct obd_uuid *uuidp, int *ost_count);
397 int llapi_lmv_get_uuids(int fd, struct obd_uuid *uuidp, int *mdt_count);
398 int llapi_is_lustre_mnttype(const char *type);
399 int llapi_search_tgt(const char *fsname, const char *poolname,
400 const char *tgtname, bool is_mdt);
401 int llapi_search_mdt(const char *fsname, const char *poolname,
402 const char *mdtname);
403 int llapi_search_ost(const char *fsname, const char *poolname,
404 const char *ostname);
405 int llapi_get_obd_count(char *mnt, int *count, int is_mdt);
406 int llapi_parse_size(const char *optarg, unsigned long long *size,
407 unsigned long long *size_units, int bytes_spec);
408 int llapi_search_mounts(const char *pathname, int index, char *mntdir,
410 int llapi_search_fsname(const char *pathname, char *fsname);
411 int llapi_get_fsname_instance(const char *path, char *fsname, size_t fsname_len,
412 char *instance, size_t instance_len);
413 int llapi_get_instance(const char *path, char *instance, size_t instance_len);
414 int llapi_get_fsname(const char *path, char *fsname, size_t fsname_len);
415 int llapi_getname(const char *path, char *name, size_t namelen);
416 int llapi_search_fileset(const char *pathname, char *fileset);
418 int llapi_search_rootpath(char *pathname, const char *fsname);
419 int llapi_nodemap_exists(const char *name);
420 int llapi_migrate_mdt(char *path, struct find_param *param);
421 int llapi_mv(char *path, struct find_param *param);
425 #define HAVE_LLAPI_IS_LUSTRE_MNT
426 int llapi_is_lustre_mnt(struct mntent *mnt);
427 int llapi_quotactl(char *mnt, struct if_quotactl *qctl);
428 int llapi_target_iterate(int type_num, char **obd_type, void *args,
430 int llapi_get_connect_flags(const char *mnt, __u64 *flags);
431 int llapi_cp(int argc, char *argv[]);
432 int llapi_ls(int argc, char *argv[]);
433 int llapi_fid_parse(const char *fidstr, struct lu_fid *fid, char **endptr);
434 int llapi_fid2path(const char *device, const char *fidstr, char *path,
435 int pathlen, long long *recno, int *linkno);
436 int llapi_path2fid(const char *path, struct lu_fid *fid);
437 int llapi_get_mdt_index_by_fid(int fd, const struct lu_fid *fid,
439 int llapi_get_lum_file(const char *path, __u64 *valid, lstatx_t *statx,
440 struct lov_user_md *lum, size_t lumsize);
441 int llapi_get_lum_dir(const char *path, __u64 *valid, lstatx_t *statx,
442 struct lov_user_md *lum, size_t lumsize);
443 int llapi_get_lum_file_fd(int dir_fd, const char *fname, __u64 *valid,
444 lstatx_t *statx, struct lov_user_md *lum,
446 int llapi_get_lum_dir_fd(int dir_fd, __u64 *valid, lstatx_t *statx,
447 struct lov_user_md *lum, size_t lumsize);
449 int llapi_fd2fid(int fd, struct lu_fid *fid);
450 /* get FID of parent dir + the related name of entry in this parent dir */
451 int llapi_path2parent(const char *path, unsigned int linkno,
452 struct lu_fid *parent_fid, char *name, size_t name_size);
453 int llapi_fd2parent(int fd, unsigned int linkno, struct lu_fid *parent_fid,
454 char *name, size_t name_size);
455 int llapi_rmfid(const char *path, struct fid_array *fa);
456 int llapi_chomp_string(char *buf);
457 int llapi_open_by_fid(const char *dir, const struct lu_fid *fid,
459 int llapi_get_version_string(char *version, unsigned int version_size);
460 /* llapi_get_version() is deprecated, use llapi_get_version_string() instead */
461 int llapi_get_version(char *buffer, int buffer_size, char **version)
462 __attribute__((deprecated));
463 int llapi_get_data_version(int fd, __u64 *data_version, __u64 flags);
464 int llapi_file_flush(int fd);
465 extern int llapi_get_ost_layout_version(int fd, __u32 *layout_version);
466 int llapi_hsm_state_get_fd(int fd, struct hsm_user_state *hus);
467 int llapi_hsm_state_get(const char *path, struct hsm_user_state *hus);
468 int llapi_hsm_state_set_fd(int fd, __u64 setmask, __u64 clearmask,
470 int llapi_hsm_state_set(const char *path, __u64 setmask, __u64 clearmask,
472 int llapi_hsm_register_event_fifo(const char *path);
473 int llapi_hsm_unregister_event_fifo(const char *path);
474 void llapi_hsm_log_error(enum llapi_message_level level, int _rc,
475 const char *fmt, va_list args);
477 int llapi_get_agent_uuid(char *path, char *buf, size_t bufsize);
478 int llapi_create_volatile_idx(const char *directory, int mdt_idx,
480 int llapi_create_volatile_param(const char *directory, int mdt_idx,
481 int open_flags, mode_t mode,
482 const struct llapi_stripe_param *stripe_param);
484 static inline int llapi_create_volatile(char *directory, int open_flags)
486 return llapi_create_volatile_idx(directory, -1, open_flags);
490 int llapi_fswap_layouts_grouplock(int fd1, int fd2, __u64 dv1, __u64 dv2,
491 int gid, __u64 flags);
492 int llapi_fswap_layouts(int fd1, int fd2, __u64 dv1, __u64 dv2, __u64 flags);
493 int llapi_swap_layouts(const char *path1, const char *path2, __u64 dv1,
494 __u64 dv2, __u64 flags);
496 /* Changelog interface. priv is private state, managed internally by these
499 /* Records received are in extended format now, though most of them are still
500 * written in disk in changelog_rec format (to save space and time), it's
501 * converted to extended format in the lustre api to ease changelog analysis. */
502 #define HAVE_CHANGELOG_EXTEND_REC 1
504 int llapi_changelog_start(void **priv, enum changelog_send_flag flags,
505 const char *mdtname, long long startrec);
506 int llapi_changelog_fini(void **priv);
507 int llapi_changelog_recv(void *priv, struct changelog_rec **rech);
508 int llapi_changelog_in_buf(void *priv);
509 int llapi_changelog_free(struct changelog_rec **rech);
510 int llapi_changelog_get_fd(void *priv);
511 /* Allow records up to endrec to be destroyed; requires registered id. */
512 int llapi_changelog_clear(const char *mdtname, const char *idstr,
514 extern int llapi_changelog_set_xflags(void *priv,
515 enum changelog_send_extra_flag extra_flags);
517 /* HSM copytool interface.
518 * priv is private state, managed internally by these functions
520 struct hsm_copytool_private;
521 struct hsm_copyaction_private;
523 int llapi_hsm_copytool_register(struct hsm_copytool_private **priv,
524 const char *mnt, int archive_count,
525 int *archives, int rfd_flags);
526 int llapi_hsm_copytool_unregister(struct hsm_copytool_private **priv);
527 int llapi_hsm_copytool_get_fd(struct hsm_copytool_private *ct);
528 int llapi_hsm_copytool_recv(struct hsm_copytool_private *priv,
529 struct hsm_action_list **hal, int *msgsize);
530 int llapi_hsm_action_begin(struct hsm_copyaction_private **phcp,
531 const struct hsm_copytool_private *ct,
532 const struct hsm_action_item *hai,
533 int restore_mdt_index, int restore_open_flags,
535 int llapi_hsm_action_end(struct hsm_copyaction_private **phcp,
536 const struct hsm_extent *he, int hp_flags, int errval);
537 int llapi_hsm_action_progress(struct hsm_copyaction_private *hcp,
538 const struct hsm_extent *he, __u64 total,
540 int llapi_hsm_action_get_dfid(const struct hsm_copyaction_private *hcp,
542 int llapi_hsm_action_get_fd(const struct hsm_copyaction_private *hcp);
543 int llapi_hsm_import(const char *dst, int archive, const struct stat *st,
544 unsigned long long stripe_size, int stripe_offset,
545 int stripe_count, int stripe_pattern, char *pool_name,
546 struct lu_fid *newfid);
548 /* HSM user interface */
549 struct hsm_user_request *llapi_hsm_user_request_alloc(int itemcount,
551 int llapi_hsm_request(const char *path, const struct hsm_user_request *request);
552 int llapi_hsm_current_action(const char *path, struct hsm_current_action *hca);
555 int llapi_json_init_list(struct llapi_json_item_list **item_list);
556 int llapi_json_destroy_list(struct llapi_json_item_list **item_list);
557 int llapi_json_add_item(struct llapi_json_item_list **item_list, char *key,
558 __u32 type, void *val);
559 int llapi_json_write_list(struct llapi_json_item_list **item_list, FILE *fp);
562 int llapi_lease_acquire(int fd, enum ll_lease_mode mode);
563 int llapi_lease_release(int fd);
564 int llapi_lease_set(int fd, const struct ll_ioc_lease *data);
565 int llapi_lease_check(int fd);
566 int llapi_lease_get(int fd, int mode); /* obsoleted */
567 int llapi_lease_put(int fd); /* obsoleted */
570 int llapi_group_lock(int fd, int gid);
571 int llapi_group_unlock(int fd, int gid);
574 int llapi_ladvise(int fd, unsigned long long flags, int num_advise,
575 struct llapi_lu_ladvise *ladvise);
578 int llapi_pcc_attach(const char *path, __u32 id, enum lu_pcc_type type);
579 int llapi_pcc_attach_fid(const char *mntpath, const struct lu_fid *fid,
580 __u32 id, enum lu_pcc_type type);
581 int llapi_pcc_attach_fid_str(const char *mntpath, const char *fidstr,
582 __u32 id, enum lu_pcc_type type);
583 int llapi_pcc_detach_fd(int fd, __u32 option);
584 int llapi_pcc_detach_fid(const char *mntpath, const struct lu_fid *fid,
586 int llapi_pcc_detach_fid_str(const char *mntpath, const char *fidstr,
588 int llapi_pcc_detach_file(const char *path, __u32 option);
589 int llapi_pcc_state_get_fd(int fd, struct lu_pcc_state *state);
590 int llapi_pcc_state_get(const char *path, struct lu_pcc_state *state);
591 int llapi_pccdev_set(const char *mntpath, const char *cmd);
592 int llapi_pccdev_get(const char *mntpath);
595 /* llapi_layout user interface */
598 * An array element storing component info to be resynced during mirror
601 struct llapi_resync_comp {
604 uint32_t lrc_mirror_id;
605 uint32_t lrc_id; /* component id */
609 /** Opaque data type abstracting the layout of a Lustre file. */
612 int llapi_mirror_truncate(int fd, unsigned int id, off_t length);
613 ssize_t llapi_mirror_write(int fd, unsigned int id, const void *buf,
614 size_t count, off_t pos);
615 uint32_t llapi_mirror_find(struct llapi_layout *layout,
616 uint64_t file_start, uint64_t file_end,
618 int llapi_mirror_find_stale(struct llapi_layout *layout,
619 struct llapi_resync_comp *comp, size_t comp_size,
620 __u16 *mirror_ids, int ids_nr);
621 int llapi_mirror_resync_many(int fd, struct llapi_layout *layout,
622 struct llapi_resync_comp *comp_array,
623 int comp_size, uint64_t start, uint64_t end);
625 * Flags to control how layouts are retrieved.
628 /* Replace non-specified values with expected inherited values. */
629 #define LAYOUT_GET_EXPECTED 0x1
632 * Return a pointer to a newly-allocated opaque data structure containing
633 * the layout for the file at \a path. The pointer should be freed with
634 * llapi_layout_free() when it is no longer needed. Failure is indicated
635 * by a NULL return value and an appropriate error code stored in errno.
637 struct llapi_layout *llapi_layout_get_by_path(const char *path, uint32_t flags);
640 * Return a pointer to a newly-allocated opaque data type containing the
641 * layout for the file referenced by open file descriptor \a fd. The
642 * pointer should be freed with llapi_layout_free() when it is no longer
643 * needed. Failure is indicated by a NULL return value and an
644 * appropriate error code stored in errno.
646 struct llapi_layout *llapi_layout_get_by_fd(int fd, uint32_t flags);
649 * Return a pointer to a newly-allocated opaque data type containing the
650 * layout for the file associated with Lustre file identifier
651 * \a fid. The string \a path must name a path within the
652 * filesystem that contains the file being looked up, such as the
653 * filesystem root. The returned pointer should be freed with
654 * llapi_layout_free() when it is no longer needed. Failure is
655 * indicated with a NULL return value and an appropriate error code
658 struct llapi_layout *llapi_layout_get_by_fid(const char *path,
659 const struct lu_fid *fid,
662 enum llapi_layout_xattr_flags {
663 LLAPI_LXF_CHECK = 0x0001,
664 LLAPI_LXF_COPY = 0x0002,
668 * Return a pointer to a newly-allocated opaque data type containing the
669 * layout for the file associated with extended attribute \a lov_xattr. The
670 * length of the extended attribute is \a lov_xattr_size. The \a lov_xattr
671 * should be raw xattr without being swapped, since this function will swap it
672 * properly. Thus, \a lov_xattr will be modified during the process. If the
673 * \a LLAPI_LXF_CHECK flag of \a flags is set, this function will check whether
674 * the objects count in lum is consistent with the stripe count in lum. This
675 * check only apply to regular file, so \a LLAPI_LXF_CHECK flag should be
676 * cleared if the xattr belongs to a directory. If the \a LLAPI_LXF_COPY flag
677 * of \a flags is set, this function will use a temporary buffer for byte
678 * swapping when necessary, leaving \a lov_xattr untouched. Otherwise, the byte
679 * swapping will be done to the \a lov_xattr buffer directly. The returned
680 * pointer should be freed with llapi_layout_free() when it is no longer
681 * needed. Failure is * indicated with a NULL return value and an appropriate
682 * error code stored in errno.
684 struct llapi_layout *llapi_layout_get_by_xattr(void *lov_xattr,
685 ssize_t lov_xattr_size,
689 * Allocate a new layout. Use this when creating a new file with
690 * llapi_layout_file_create().
692 struct llapi_layout *llapi_layout_alloc(void);
695 * Free memory allocated for \a layout.
697 void llapi_layout_free(struct llapi_layout *layout);
700 * llapi_layout_merge() - Merge a composite layout into another one.
701 * @dst_layout: Destination composite layout.
702 * @src_layout: Source composite layout.
704 * This function copies all of the components from @src_layout and
705 * appends them to @dst_layout.
707 * Return: 0 on success or -1 on failure.
709 int llapi_layout_merge(struct llapi_layout **dst_layout,
710 const struct llapi_layout *src_layout);
712 /** Not a valid stripe size, offset, or RAID pattern. */
713 #define LLAPI_LAYOUT_INVALID 0x1000000000000001ULL
716 * When specified or returned as the value for stripe count,
717 * stripe size, offset, or RAID pattern, the filesystem-wide
718 * default behavior will apply.
720 #define LLAPI_LAYOUT_DEFAULT (LLAPI_LAYOUT_INVALID + 1)
723 * When specified or returned as the value for stripe count, all
724 * available OSTs will be used.
726 #define LLAPI_LAYOUT_WIDE (LLAPI_LAYOUT_INVALID + 2)
729 * When specified as the value for layout pattern, file objects will be
730 * stored using RAID0. That is, data will be split evenly and without
731 * redundancy across all OSTs in the layout.
733 #define LLAPI_LAYOUT_RAID0 0ULL
734 #define LLAPI_LAYOUT_MDT 2ULL
735 #define LLAPI_LAYOUT_OVERSTRIPING 4ULL
738 * The layout includes a specific set of OSTs on which to allocate.
740 #define LLAPI_LAYOUT_SPECIFIC 0x2000000000000000ULL
743 * A valid ost index should be less than maximum valid OST index (UINT_MAX).
745 #define LLAPI_LAYOUT_IDX_MAX 0x00000000FFFFFFFFULL
748 * Flags to modify how layouts are retrieved.
750 /******************** Stripe Count ********************/
753 * Store the stripe count of \a layout in \a count.
756 * \retval -1 Error with status code in errno.
758 int llapi_layout_stripe_count_get(const struct llapi_layout *layout,
762 * Set the stripe count of \a layout to \a count.
765 * \retval -1 Invalid argument, errno set to EINVAL.
767 int llapi_layout_stripe_count_set(struct llapi_layout *layout, uint64_t count);
769 /******************** Stripe Size ********************/
772 * Store the stripe size of \a layout in \a size.
775 * \retval -1 Invalid argument, errno set to EINVAL.
777 int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
781 * Set the stripe size of \a layout to \a stripe_size.
784 * \retval -1 Invalid argument, errno set to EINVAL.
786 int llapi_layout_stripe_size_set(struct llapi_layout *layout, uint64_t size);
789 /******************** Extension Size ********************/
792 * Store the extension size of \a layout in \a size.
795 * \retval -1 Invalid argument, errno set to EINVAL.
797 int llapi_layout_extension_size_get(const struct llapi_layout *layout,
801 * Set the extension size of \a layout to \a stripe_size.
804 * \retval -1 Invalid argument, errno set to EINVAL.
806 int llapi_layout_extension_size_set(struct llapi_layout *layout, uint64_t size);
809 /******************** Stripe Pattern ********************/
812 * Store the stripe pattern of \a layout in \a pattern.
815 * \retval -1 Error with status code in errno.
817 int llapi_layout_pattern_get(const struct llapi_layout *layout,
821 * Set the stripe pattern of \a layout to \a pattern.
824 * \retval -1 Invalid argument, errno set to EINVAL.
826 int llapi_layout_pattern_set(struct llapi_layout *layout, uint64_t pattern);
828 /******************** OST Index ********************/
831 * Store the index of the OST where stripe number \a stripe_number is stored
834 * An error return value will result from a NULL layout, if \a
835 * stripe_number is out of range, or if \a layout was not initialized
836 * with llapi_layout_lookup_by{path,fd,fid}().
839 * \retval -1 Invalid argument, errno set to EINVAL.
841 int llapi_layout_ost_index_get(const struct llapi_layout *layout,
842 uint64_t stripe_number, uint64_t *index);
845 * Set the OST index associated with stripe number \a stripe_number to
847 * NB: This is currently supported only for \a stripe_number = 0 and
848 * other usage will return ENOTSUPP in errno. A NULL \a layout or
849 * out-of-range \a stripe_number will return EINVAL in errno.
852 * \retval -1 Error with errno set to non-zero value.
854 int llapi_layout_ost_index_set(struct llapi_layout *layout, int stripe_number,
857 /******************** Pool Name ********************/
860 * Store up to \a pool_name_len characters of the name of the pool of
861 * OSTs associated with \a layout into the buffer pointed to by
864 * The correct calling form is:
866 * llapi_layout_pool_name_get(layout, pool_name, sizeof(pool_name));
868 * A pool defines a set of OSTs from which file objects may be
869 * allocated for a file using \a layout.
871 * On success, the number of bytes stored is returned, excluding the
872 * terminating '\0' character (zero indicates that \a layout does not
873 * have an associated OST pool). On error, -1 is returned and errno is
874 * set appropriately. Possible sources of error include a NULL pointer
875 * argument or insufficient space in \a dest to store the pool name,
876 * in which cases errno will be set to EINVAL.
878 * \retval 0+ The number of bytes stored in \a dest.
879 * \retval -1 Invalid argument, errno set to EINVAL.
881 int llapi_layout_pool_name_get(const struct llapi_layout *layout,
882 char *pool_name, size_t pool_name_len);
885 * Set the name of the pool of OSTs from which file objects will be
886 * allocated to \a pool_name.
888 * If the pool name uses "fsname.pool" notation to qualify the pool name
889 * with a filesystem name, the "fsname." portion will be silently
890 * discarded before storing the value. No validation that \a pool_name
891 * is an existing non-empty pool in filesystem \a fsname will be
892 * performed. Such validation can be performed by the application if
893 * desired using the llapi_search_ost() function. The maximum length of
894 * the stored value is defined by the constant LOV_MAXPOOLNAME.
897 * \retval -1 Invalid argument, errno set to EINVAL.
899 int llapi_layout_pool_name_set(struct llapi_layout *layout,
900 const char *pool_name);
902 /******************** File Creation ********************/
905 * Open an existing file at \a path, or create it with the specified
906 * \a layout and \a mode.
908 * One access mode and zero or more file creation flags and file status
909 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
910 * open file descriptor for the file. If \a layout is non-NULL and
911 * \a path is not on a Lustre filesystem this function will fail and set
914 * An already existing file may be opened with this function, but
915 * \a layout and \a mode will not be applied to it. Callers requiring a
916 * guarantee that the opened file is created with the specified
917 * \a layout and \a mode should use llapi_layout_file_create().
919 * A NULL \a layout may be specified, in which case the standard Lustre
920 * behavior for assigning layouts to newly-created files will apply.
922 * \retval 0+ An open file descriptor.
923 * \retval -1 Error with status code in errno.
925 int llapi_layout_file_open(const char *path, int open_flags, mode_t mode,
926 const struct llapi_layout *layout);
929 * Create a new file at \a path with the specified \a layout and \a mode.
931 * One access mode and zero or more file creation flags and file status
932 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
933 * open file descriptor for the file. If \a layout is non-NULL and
934 * \a path is not on a Lustre filesystem this function will fail and set
939 * llapi_layout_file_create(path, open_flags, mode, layout)
941 * shall be equivalent to:
943 * llapi_layout_file_open(path, open_flags|O_CREAT|O_EXCL, mode, layout)
945 * It is an error if \a path specifies an existing file.
947 * A NULL \a layout may be specified, in which the standard Lustre
948 * behavior for assigning layouts to newly-created files will apply.
950 * \retval 0+ An open file descriptor.
951 * \retval -1 Error with status code in errno.
953 int llapi_layout_file_create(const char *path, int open_flags, int mode,
954 const struct llapi_layout *layout);
957 * Set flags to the header of component layout.
959 int llapi_layout_flags_set(struct llapi_layout *layout, uint32_t flags);
960 int llapi_layout_flags_get(struct llapi_layout *layout, uint32_t *flags);
961 const char *llapi_layout_flags_string(uint32_t flags);
962 const __u16 llapi_layout_string_flags(char *string);
965 * llapi_layout_mirror_count_get() - Get mirror count from the header of
967 * @layout: Layout to get mirror count from.
968 * @count: Returned mirror count value.
970 * This function gets mirror count from the header of a layout.
972 * Return: 0 on success or -1 on failure.
974 int llapi_layout_mirror_count_get(struct llapi_layout *layout,
978 * llapi_layout_mirror_count_set() - Set mirror count to the header of a layout.
979 * @layout: Layout to set mirror count in.
980 * @count: Mirror count value to be set.
982 * This function sets mirror count to the header of a layout.
984 * Return: 0 on success or -1 on failure.
986 int llapi_layout_mirror_count_set(struct llapi_layout *layout,
990 * Fetch the start and end offset of the current layout component.
992 int llapi_layout_comp_extent_get(const struct llapi_layout *layout,
993 uint64_t *start, uint64_t *end);
995 * Set the extent of current layout component.
997 int llapi_layout_comp_extent_set(struct llapi_layout *layout,
998 uint64_t start, uint64_t end);
1000 /* PFL component flags table */
1001 static const struct comp_flag_name {
1002 enum lov_comp_md_entry_flags cfn_flag;
1003 const char *cfn_name;
1004 } comp_flags_table[] = {
1005 { LCME_FL_INIT, "init" },
1006 { LCME_FL_STALE, "stale" },
1007 { LCME_FL_PREF_RW, "prefer" },
1008 { LCME_FL_OFFLINE, "offline" },
1009 { LCME_FL_NOSYNC, "nosync" },
1010 { LCME_FL_EXTENSION, "extension" },
1014 * Gets the attribute flags of the current component.
1016 int llapi_layout_comp_flags_get(const struct llapi_layout *layout,
1019 * Sets the specified flags of the current component leaving other flags as-is.
1021 int llapi_layout_comp_flags_set(struct llapi_layout *layout, uint32_t flags);
1023 * Clears the flags specified in the flags leaving other flags as-is.
1025 int llapi_layout_comp_flags_clear(struct llapi_layout *layout, uint32_t flags);
1027 * Fetches the file-unique component ID of the current layout component.
1029 int llapi_layout_comp_id_get(const struct llapi_layout *layout, uint32_t *id);
1031 * Fetches the mirror ID of the current layout component.
1033 int llapi_layout_mirror_id_get(const struct llapi_layout *layout, uint32_t *id);
1035 * Adds one component to the existing composite or plain layout.
1037 int llapi_layout_comp_add(struct llapi_layout *layout);
1039 * Adds a first component of a mirror to the existing composite layout.
1041 int llapi_layout_add_first_comp(struct llapi_layout *layout);
1043 * Deletes the current layout component from the composite layout.
1045 int llapi_layout_comp_del(struct llapi_layout *layout);
1047 enum llapi_layout_comp_use {
1048 LLAPI_LAYOUT_COMP_USE_FIRST = 1,
1049 LLAPI_LAYOUT_COMP_USE_LAST = 2,
1050 LLAPI_LAYOUT_COMP_USE_NEXT = 3,
1051 LLAPI_LAYOUT_COMP_USE_PREV = 4,
1055 * Set the currently active component to the specified component ID.
1057 int llapi_layout_comp_use_id(struct llapi_layout *layout, uint32_t id);
1059 * Select the currently active component at the specified position.
1061 int llapi_layout_comp_use(struct llapi_layout *layout, uint32_t pos);
1063 * Add layout components to an existing file.
1065 int llapi_layout_file_comp_add(const char *path,
1066 const struct llapi_layout *layout);
1068 * Delete component(s) by the specified component id or flags.
1070 int llapi_layout_file_comp_del(const char *path, uint32_t id, uint32_t flags);
1072 * Change flags or other parameters of the component(s) by component ID of an
1073 * existing file. The component to be modified is specified by the
1074 * comp->lcme_id value, which must be an unique component ID. The new
1075 * attributes are passed in by @comp and @valid is used to specify which
1076 * attributes in the component are going to be changed.
1078 int llapi_layout_file_comp_set(const char *path, uint32_t *ids, uint32_t *flags,
1081 * Check if the file layout is composite.
1083 bool llapi_layout_is_composite(struct llapi_layout *layout);
1086 LLAPI_LAYOUT_ITER_CONT = 0,
1087 LLAPI_LAYOUT_ITER_STOP = 1,
1091 * Iteration callback function.
1093 * \retval LLAPI_LAYOUT_ITER_CONT Iteration proceeds
1094 * \retval LLAPI_LAYOUT_ITER_STOP Stop iteration
1095 * \retval < 0 error code
1097 typedef int (*llapi_layout_iter_cb)(struct llapi_layout *layout, void *cbdata);
1100 * Iterate all components in the corresponding layout
1102 int llapi_layout_comp_iterate(struct llapi_layout *layout,
1103 llapi_layout_iter_cb cb, void *cbdata);
1106 * FLR: mirror operation APIs
1108 int llapi_mirror_set(int fd, unsigned int id);
1109 int llapi_mirror_clear(int fd);
1110 ssize_t llapi_mirror_read(int fd, unsigned int id,
1111 void *buf, size_t count, off_t pos);
1112 ssize_t llapi_mirror_copy_many(int fd, __u16 src, __u16 *dst, size_t count);
1113 int llapi_mirror_copy(int fd, unsigned int src, unsigned int dst,
1114 off_t pos, size_t count);
1116 int llapi_heat_get(int fd, struct lu_heat *heat);
1117 int llapi_heat_set(int fd, __u64 flags);
1118 int llapi_layout_sanity(struct llapi_layout *layout, bool incomplete, bool flr);
1119 void llapi_layout_sanity_perror(int error);
1120 int llapi_layout_dom_size(struct llapi_layout *layout, uint64_t *size);
1122 int llapi_param_get_paths(const char *pattern, glob_t *paths);
1123 int llapi_param_get_value(const char *path, char **buf, size_t *buflen);
1124 void llapi_param_paths_free(glob_t *paths);
1128 #if defined(__cplusplus)