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
43 #include <linux/lustre/lustre_user.h>
45 #if defined(__cplusplus)
50 #define LL_MAXQUOTAS 3
54 #define ARRAY_SIZE(a) ((sizeof(a)) / (sizeof((a)[0])))
57 #define lustre_fid struct lu_fid
59 /* Currently external applications can access this but in the
60 * future this will no longer be exposed for the user. Instead
61 * if you want to know if the library is initialized just call
62 * llapi_liblustreapi_initialized() which is now available. */
63 extern bool liblustreapi_initialized;
65 typedef void (*llapi_cb_t)(char *obd_type_name, char *obd_name, char *obd_uuid,
68 /* lustreapi message severity level */
69 enum llapi_message_level {
80 typedef void (*llapi_log_callback_t)(enum llapi_message_level level, int err,
81 const char *fmt, va_list ap);
83 static inline bool llapi_liblustreapi_initialized(void)
85 return liblustreapi_initialized;
88 /* the bottom three bits reserved for llapi_message_level */
89 #define LLAPI_MSG_MASK 0x00000007
90 #define LLAPI_MSG_NO_ERRNO 0x00000010
92 static inline const char *llapi_msg_level2str(enum llapi_message_level level)
94 static const char *levels[LLAPI_MSG_MAX] = {"OFF", "FATAL", "ERROR",
98 if (level >= LLAPI_MSG_MAX)
101 return levels[level];
104 void llapi_msg_set_level(int level);
105 int llapi_msg_get_level(void);
106 llapi_log_callback_t llapi_error_callback_set(llapi_log_callback_t cb);
107 llapi_log_callback_t llapi_info_callback_set(llapi_log_callback_t cb);
109 void llapi_error(enum llapi_message_level level, int err, const char *fmt, ...)
110 __attribute__((__format__(__printf__, 3, 4)));
111 #define llapi_err_noerrno(level, fmt, a...) \
112 llapi_error((level) | LLAPI_MSG_NO_ERRNO, 0, fmt, ## a)
113 void llapi_printf(enum llapi_message_level level, const char *fmt, ...)
114 __attribute__((__format__(__printf__, 2, 3)));
116 struct llapi_stripe_param {
117 unsigned long long lsp_stripe_size;
119 int lsp_stripe_offset;
120 int lsp_stripe_pattern;
121 /* Number of stripes. Size of lsp_osts[] if lsp_specific is true.*/
122 int lsp_stripe_count;
123 bool lsp_is_specific;
127 #define lsp_tgts lsp_osts
129 int llapi_file_open_param(const char *name, int flags, mode_t mode,
130 const struct llapi_stripe_param *param);
131 int llapi_file_create(const char *name, unsigned long long stripe_size,
132 int stripe_offset, int stripe_count, int stripe_pattern);
133 int llapi_file_open(const char *name, int flags, int mode,
134 unsigned long long stripe_size, int stripe_offset,
135 int stripe_count, int stripe_pattern);
136 int llapi_file_create_pool(const char *name, unsigned long long stripe_size,
137 int stripe_offset, int stripe_count,
138 int stripe_pattern, char *pool_name);
139 int llapi_file_open_pool(const char *name, int flags, int mode,
140 unsigned long long stripe_size, int stripe_offset,
141 int stripe_count, int stripe_pattern, char *pool_name);
142 int llapi_poollist(const char *name);
143 int llapi_get_poollist(const char *name, char **poollist, int list_size,
144 char *buffer, int buffer_size);
145 int llapi_get_poolmembers(const char *poolname, char **members, int list_size,
146 char *buffer, int buffer_size);
147 int llapi_file_get_stripe(const char *path, struct lov_user_md *lum);
148 int llapi_file_lookup(int dirfd, const char *name);
149 void llapi_set_command_name(const char *cmd);
150 void llapi_clear_command_name(void);
152 enum llapi_layout_verbose {
153 VERBOSE_STRIPE_COUNT = 0x1,
154 VERBOSE_STRIPE_SIZE = 0x2,
155 VERBOSE_STRIPE_OFFSET = 0x4,
157 VERBOSE_DETAIL = 0x10,
158 VERBOSE_OBJID = 0x20,
159 VERBOSE_GENERATION = 0x40,
160 VERBOSE_MDTINDEX = 0x80,
161 VERBOSE_PATTERN = 0x100,
162 VERBOSE_COMP_COUNT = 0x200,
163 VERBOSE_COMP_FLAGS = 0x400,
164 VERBOSE_COMP_START = 0x800,
165 VERBOSE_COMP_END = 0x1000,
166 VERBOSE_COMP_ID = 0x2000,
167 VERBOSE_DFID = 0x4000,
168 VERBOSE_HASH_TYPE = 0x8000,
169 VERBOSE_MIRROR_COUNT = 0x10000,
170 VERBOSE_MIRROR_ID = 0x20000,
171 VERBOSE_DEFAULT = VERBOSE_STRIPE_COUNT | VERBOSE_STRIPE_SIZE |
172 VERBOSE_STRIPE_OFFSET | VERBOSE_POOL |
173 VERBOSE_OBJID | VERBOSE_GENERATION |
174 VERBOSE_PATTERN | VERBOSE_HASH_TYPE |
175 VERBOSE_COMP_COUNT | VERBOSE_COMP_FLAGS |
176 VERBOSE_COMP_START | VERBOSE_COMP_END |
177 VERBOSE_COMP_ID | VERBOSE_MIRROR_COUNT |
180 /* Compatibility with original names */
181 #define VERBOSE_SIZE VERBOSE_STRIPE_SIZE
182 #define VERBOSE_COUNT VERBOSE_STRIPE_COUNT
183 #define VERBOSE_OFFSET VERBOSE_STRIPE_OFFSET
184 #define VERBOSE_LAYOUT VERBOSE_PATTERN
187 unsigned int fp_max_depth;
189 mode_t fp_type; /* S_IFIFO,... */
195 /* {a,m,c}sign cannot be bitfields due to using pointers to
196 * access them during argument parsing. */
200 /* these need to be signed values */
202 fp_stripe_size_sign:2,
203 fp_stripe_count_sign:2,
204 fp_comp_start_sign:2,
206 fp_comp_count_sign:2,
207 fp_mirror_count_sign:2,
208 fp_mirror_index_sign:2,
212 unsigned long long fp_size;
213 unsigned long long fp_size_units;
215 unsigned long long fp_zero_end:1,
217 fp_exclude_pattern:1,
225 fp_check_pool:1, /* LOV pool name */
226 fp_check_size:1, /* file size */
232 fp_get_lmv:1, /* get MDT list from LMV */
233 fp_raw:1, /* do not fill in defaults */
234 fp_check_stripe_size:1, /* LOV stripe size */
235 fp_exclude_stripe_size:1,
236 fp_check_stripe_count:1, /* LOV stripe count */
237 fp_exclude_stripe_count:1,
240 fp_get_default_lmv:1, /* Get default LMV */
244 fp_check_comp_count:1,
245 fp_exclude_comp_count:1,
246 fp_check_mirror_count:1,
247 fp_exclude_mirror_count:1,
248 fp_check_comp_flags:1,
249 fp_check_mirror_state:1,
250 fp_check_comp_start:1,
251 fp_exclude_comp_start:1,
253 fp_exclude_comp_end:1,
255 fp_exclude_comp_id:1,
256 fp_check_mirror_id:1,
257 fp_exclude_mirror_id:1,
258 fp_check_mirror_index:1,
259 fp_exclude_mirror_index:1,
260 fp_check_mdt_count:1,
261 fp_exclude_mdt_count:1,
262 fp_check_hash_type:1,
263 fp_exclude_hash_type:1,
264 fp_yaml:1, /* output layout in YAML */
268 enum llapi_layout_verbose fp_verbose;
271 /* regular expression */
274 struct obd_uuid *fp_obd_uuid;
276 int fp_num_alloc_obds;
280 struct obd_uuid *fp_mdt_uuid;
282 int fp_num_alloc_mdts;
285 int fp_file_mdt_index;
288 struct lov_user_mds_data *fp_lmd;
290 char fp_poolname[LOV_MAXPOOLNAME + 1];
292 __u32 fp_lmv_stripe_count;
293 struct lmv_user_md *fp_lmv_md;
295 unsigned long long fp_stripe_size;
296 unsigned long long fp_stripe_size_units;
297 unsigned long long fp_stripe_count;
301 __u32 fp_mirror_count;
303 __u32 fp_comp_neg_flags;
304 __u16 fp_mirror_state;
305 __u16 fp_mirror_neg_state;
308 __u16 fp_mirror_index;
309 unsigned long long fp_comp_start;
310 unsigned long long fp_comp_start_units;
311 unsigned long long fp_comp_end;
312 unsigned long long fp_comp_end_units;
313 unsigned long long fp_mdt_count;
315 unsigned long long fp_blocks;
316 unsigned long long fp_blocks_units;
318 /* In-process parameters. */
319 unsigned long fp_got_uuids:1,
321 unsigned int fp_depth;
322 unsigned int fp_hash_type;
325 int llapi_ostlist(char *path, struct find_param *param);
326 int llapi_uuid_match(char *real_uuid, char *search_uuid);
327 int llapi_getstripe(char *path, struct find_param *param);
328 int llapi_find(char *path, struct find_param *param);
330 int llapi_file_fget_mdtidx(int fd, int *mdtidx);
331 int llapi_dir_set_default_lmv(const char *name,
332 const struct llapi_stripe_param *param);
333 int llapi_dir_set_default_lmv_stripe(const char *name, int stripe_offset,
334 int stripe_count, int stripe_pattern,
335 const char *pool_name);
336 int llapi_dir_create(const char *name, mode_t mode,
337 const struct llapi_stripe_param *param);
338 int llapi_dir_create_pool(const char *name, int flags, int stripe_offset,
339 int stripe_count, int stripe_pattern,
340 const char *poolname);
341 int llapi_direntry_remove(char *dname);
343 int llapi_obd_fstatfs(int fd, __u32 type, __u32 index,
344 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
345 int llapi_obd_statfs(char *path, __u32 type, __u32 index,
346 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
347 int llapi_ping(char *obd_type, char *obd_name);
348 int llapi_target_check(int num_types, char **obd_types, char *dir);
349 int llapi_file_get_lov_uuid(const char *path, struct obd_uuid *lov_uuid);
350 int llapi_file_get_lmv_uuid(const char *path, struct obd_uuid *lmv_uuid);
351 int llapi_file_fget_lov_uuid(int fd, struct obd_uuid *lov_uuid);
352 int llapi_lov_get_uuids(int fd, struct obd_uuid *uuidp, int *ost_count);
353 int llapi_lmv_get_uuids(int fd, struct obd_uuid *uuidp, int *mdt_count);
354 int llapi_is_lustre_mnttype(const char *type);
355 int llapi_search_tgt(char *fsname, char *poolname, char *tgtname, bool is_mdt);
356 int llapi_search_ost(char *fsname, char *poolname, char *ostname);
357 int llapi_get_obd_count(char *mnt, int *count, int is_mdt);
358 int llapi_parse_size(const char *optarg, unsigned long long *size,
359 unsigned long long *size_units, int bytes_spec);
360 int llapi_search_mounts(const char *pathname, int index, char *mntdir,
362 int llapi_search_fsname(const char *pathname, char *fsname);
363 int llapi_getname(const char *path, char *buf, size_t size);
364 int llapi_search_fileset(const char *pathname, char *fileset);
366 int llapi_search_rootpath(char *pathname, const char *fsname);
367 int llapi_nodemap_exists(const char *name);
368 int llapi_migrate_mdt(char *path, struct find_param *param);
369 int llapi_mv(char *path, struct find_param *param);
373 #define HAVE_LLAPI_IS_LUSTRE_MNT
374 int llapi_is_lustre_mnt(struct mntent *mnt);
375 int llapi_quotactl(char *mnt, struct if_quotactl *qctl);
376 int llapi_target_iterate(int type_num, char **obd_type, void *args,
378 int llapi_get_connect_flags(const char *mnt, __u64 *flags);
379 int llapi_cp(int argc, char *argv[]);
380 int llapi_ls(int argc, char *argv[]);
381 int llapi_fid2path(const char *device, const char *fidstr, char *path,
382 int pathlen, long long *recno, int *linkno);
383 int llapi_path2fid(const char *path, struct lu_fid *fid);
384 int llapi_get_mdt_index_by_fid(int fd, const struct lu_fid *fid,
386 int llapi_fd2fid(int fd, struct lu_fid *fid);
387 /* get FID of parent dir + the related name of entry in this parent dir */
388 int llapi_path2parent(const char *path, unsigned int linkno,
389 struct lu_fid *parent_fid, char *name, size_t name_size);
390 int llapi_fd2parent(int fd, unsigned int linkno, struct lu_fid *parent_fid,
391 char *name, size_t name_size);
392 int llapi_chomp_string(char *buf);
393 int llapi_open_by_fid(const char *dir, const struct lu_fid *fid,
395 int llapi_get_version_string(char *version, unsigned int version_size);
396 /* llapi_get_version() is deprecated, use llapi_get_version_string() instead */
397 int llapi_get_version(char *buffer, int buffer_size, char **version)
398 __attribute__((deprecated));
399 int llapi_get_data_version(int fd, __u64 *data_version, __u64 flags);
400 int llapi_file_flush(int fd);
401 extern int llapi_get_ost_layout_version(int fd, __u32 *layout_version);
402 int llapi_hsm_state_get_fd(int fd, struct hsm_user_state *hus);
403 int llapi_hsm_state_get(const char *path, struct hsm_user_state *hus);
404 int llapi_hsm_state_set_fd(int fd, __u64 setmask, __u64 clearmask,
406 int llapi_hsm_state_set(const char *path, __u64 setmask, __u64 clearmask,
408 int llapi_hsm_register_event_fifo(const char *path);
409 int llapi_hsm_unregister_event_fifo(const char *path);
410 void llapi_hsm_log_error(enum llapi_message_level level, int _rc,
411 const char *fmt, va_list args);
413 int llapi_get_agent_uuid(char *path, char *buf, size_t bufsize);
414 int llapi_create_volatile_idx(const char *directory, int mdt_idx,
416 int llapi_create_volatile_param(const char *directory, int mdt_idx,
417 int open_flags, mode_t mode,
418 const struct llapi_stripe_param *stripe_param);
420 static inline int llapi_create_volatile(char *directory, int open_flags)
422 return llapi_create_volatile_idx(directory, -1, open_flags);
426 int llapi_fswap_layouts_grouplock(int fd1, int fd2, __u64 dv1, __u64 dv2,
427 int gid, __u64 flags);
428 int llapi_fswap_layouts(int fd1, int fd2, __u64 dv1, __u64 dv2, __u64 flags);
429 int llapi_swap_layouts(const char *path1, const char *path2, __u64 dv1,
430 __u64 dv2, __u64 flags);
432 /* Changelog interface. priv is private state, managed internally by these
435 /* Records received are in extended format now, though most of them are still
436 * written in disk in changelog_rec format (to save space and time), it's
437 * converted to extended format in the lustre api to ease changelog analysis. */
438 #define HAVE_CHANGELOG_EXTEND_REC 1
440 int llapi_changelog_start(void **priv, enum changelog_send_flag flags,
441 const char *mdtname, long long startrec);
442 int llapi_changelog_fini(void **priv);
443 int llapi_changelog_recv(void *priv, struct changelog_rec **rech);
444 int llapi_changelog_free(struct changelog_rec **rech);
445 int llapi_changelog_get_fd(void *priv);
446 /* Allow records up to endrec to be destroyed; requires registered id. */
447 int llapi_changelog_clear(const char *mdtname, const char *idstr,
449 extern int llapi_changelog_set_xflags(void *priv,
450 enum changelog_send_extra_flag extra_flags);
452 /* HSM copytool interface.
453 * priv is private state, managed internally by these functions
455 struct hsm_copytool_private;
456 struct hsm_copyaction_private;
458 int llapi_hsm_copytool_register(struct hsm_copytool_private **priv,
459 const char *mnt, int archive_count,
460 int *archives, int rfd_flags);
461 int llapi_hsm_copytool_unregister(struct hsm_copytool_private **priv);
462 int llapi_hsm_copytool_get_fd(struct hsm_copytool_private *ct);
463 int llapi_hsm_copytool_recv(struct hsm_copytool_private *priv,
464 struct hsm_action_list **hal, int *msgsize);
465 int llapi_hsm_action_begin(struct hsm_copyaction_private **phcp,
466 const struct hsm_copytool_private *ct,
467 const struct hsm_action_item *hai,
468 int restore_mdt_index, int restore_open_flags,
470 int llapi_hsm_action_end(struct hsm_copyaction_private **phcp,
471 const struct hsm_extent *he, int hp_flags, int errval);
472 int llapi_hsm_action_progress(struct hsm_copyaction_private *hcp,
473 const struct hsm_extent *he, __u64 total,
475 int llapi_hsm_action_get_dfid(const struct hsm_copyaction_private *hcp,
477 int llapi_hsm_action_get_fd(const struct hsm_copyaction_private *hcp);
478 int llapi_hsm_import(const char *dst, int archive, const struct stat *st,
479 unsigned long long stripe_size, int stripe_offset,
480 int stripe_count, int stripe_pattern, char *pool_name,
481 struct lu_fid *newfid);
483 /* HSM user interface */
484 struct hsm_user_request *llapi_hsm_user_request_alloc(int itemcount,
486 int llapi_hsm_request(const char *path, const struct hsm_user_request *request);
487 int llapi_hsm_current_action(const char *path, struct hsm_current_action *hca);
490 int llapi_json_init_list(struct llapi_json_item_list **item_list);
491 int llapi_json_destroy_list(struct llapi_json_item_list **item_list);
492 int llapi_json_add_item(struct llapi_json_item_list **item_list, char *key,
493 __u32 type, void *val);
494 int llapi_json_write_list(struct llapi_json_item_list **item_list, FILE *fp);
497 int llapi_lease_acquire(int fd, enum ll_lease_mode mode);
498 int llapi_lease_release(int fd);
499 int llapi_lease_set(int fd, const struct ll_ioc_lease *data);
500 int llapi_lease_check(int fd);
501 int llapi_lease_get(int fd, int mode); /* obsoleted */
502 int llapi_lease_put(int fd); /* obsoleted */
505 int llapi_group_lock(int fd, int gid);
506 int llapi_group_unlock(int fd, int gid);
509 int llapi_ladvise(int fd, unsigned long long flags, int num_advise,
510 struct llapi_lu_ladvise *ladvise);
513 /* llapi_layout user interface */
516 * An array element storing component info to be resynced during mirror
519 struct llapi_resync_comp {
522 uint32_t lrc_mirror_id;
523 uint32_t lrc_id; /* component id */
527 /** Opaque data type abstracting the layout of a Lustre file. */
530 int llapi_mirror_truncate(int fd, unsigned int id, off_t length);
531 ssize_t llapi_mirror_write(int fd, unsigned int id, const void *buf,
532 size_t count, off_t pos);
533 uint32_t llapi_mirror_find(struct llapi_layout *layout,
534 uint64_t file_start, uint64_t file_end,
536 int llapi_mirror_find_stale(struct llapi_layout *layout,
537 struct llapi_resync_comp *comp, size_t comp_size,
538 __u16 *mirror_ids, int ids_nr);
539 int llapi_mirror_resync_many(int fd, struct llapi_layout *layout,
540 struct llapi_resync_comp *comp_array,
541 int comp_size, uint64_t start, uint64_t end);
543 * Flags to control how layouts are retrieved.
546 /* Replace non-specified values with expected inherited values. */
547 #define LAYOUT_GET_EXPECTED 0x1
550 * Return a pointer to a newly-allocated opaque data structure containing
551 * the layout for the file at \a path. The pointer should be freed with
552 * llapi_layout_free() when it is no longer needed. Failure is indicated
553 * by a NULL return value and an appropriate error code stored in errno.
555 struct llapi_layout *llapi_layout_get_by_path(const char *path, uint32_t flags);
558 * Return a pointer to a newly-allocated opaque data type containing the
559 * layout for the file referenced by open file descriptor \a fd. The
560 * pointer should be freed with llapi_layout_free() when it is no longer
561 * needed. Failure is indicated by a NULL return value and an
562 * appropriate error code stored in errno.
564 struct llapi_layout *llapi_layout_get_by_fd(int fd, uint32_t flags);
567 * Return a pointer to a newly-allocated opaque data type containing the
568 * layout for the file associated with Lustre file identifier string
569 * \a fidstr. The string \a path must name a path within the
570 * filesystem that contains the file being looked up, such as the
571 * filesystem root. The returned pointer should be freed with
572 * llapi_layout_free() when it is no longer needed. Failure is
573 * indicated with a NULL return value and an appropriate error code
576 struct llapi_layout *llapi_layout_get_by_fid(const char *path,
577 const struct lu_fid *fid,
581 * Allocate a new layout. Use this when creating a new file with
582 * llapi_layout_file_create().
584 struct llapi_layout *llapi_layout_alloc(void);
587 * Free memory allocated for \a layout.
589 void llapi_layout_free(struct llapi_layout *layout);
592 * llapi_layout_merge() - Merge a composite layout into another one.
593 * @dst_layout: Destination composite layout.
594 * @src_layout: Source composite layout.
596 * This function copies all of the components from @src_layout and
597 * appends them to @dst_layout.
599 * Return: 0 on success or -1 on failure.
601 int llapi_layout_merge(struct llapi_layout **dst_layout,
602 const struct llapi_layout *src_layout);
604 /** Not a valid stripe size, offset, or RAID pattern. */
605 #define LLAPI_LAYOUT_INVALID 0x1000000000000001ULL
608 * When specified or returned as the value for stripe count,
609 * stripe size, offset, or RAID pattern, the filesystem-wide
610 * default behavior will apply.
612 #define LLAPI_LAYOUT_DEFAULT (LLAPI_LAYOUT_INVALID + 1)
615 * When specified or returned as the value for stripe count, all
616 * available OSTs will be used.
618 #define LLAPI_LAYOUT_WIDE (LLAPI_LAYOUT_INVALID + 2)
621 * When specified as the value for layout pattern, file objects will be
622 * stored using RAID0. That is, data will be split evenly and without
623 * redundancy across all OSTs in the layout.
625 #define LLAPI_LAYOUT_RAID0 0ULL
626 #define LLAPI_LAYOUT_MDT 2ULL
629 * The layout includes a specific set of OSTs on which to allocate.
631 #define LLAPI_LAYOUT_SPECIFIC 0x2000000000000000ULL
634 * A valid ost index should be less than maximum valid OST index (UINT_MAX).
636 #define LLAPI_LAYOUT_IDX_MAX 0x00000000FFFFFFFFULL
639 * Flags to modify how layouts are retrieved.
641 /******************** Stripe Count ********************/
644 * Store the stripe count of \a layout in \a count.
647 * \retval -1 Error with status code in errno.
649 int llapi_layout_stripe_count_get(const struct llapi_layout *layout,
653 * Set the stripe count of \a layout to \a count.
656 * \retval -1 Invalid argument, errno set to EINVAL.
658 int llapi_layout_stripe_count_set(struct llapi_layout *layout, uint64_t count);
660 /******************** Stripe Size ********************/
663 * Store the stripe size of \a layout in \a size.
666 * \retval -1 Invalid argument, errno set to EINVAL.
668 int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
672 * Set the stripe size of \a layout to \a stripe_size.
675 * \retval -1 Invalid argument, errno set to EINVAL.
677 int llapi_layout_stripe_size_set(struct llapi_layout *layout, uint64_t size);
679 /******************** Stripe Pattern ********************/
682 * Store the stripe pattern of \a layout in \a pattern.
685 * \retval -1 Error with status code in errno.
687 int llapi_layout_pattern_get(const struct llapi_layout *layout,
691 * Set the stripe pattern of \a layout to \a pattern.
694 * \retval -1 Invalid argument, errno set to EINVAL.
696 int llapi_layout_pattern_set(struct llapi_layout *layout, uint64_t pattern);
698 /******************** OST Index ********************/
701 * Store the index of the OST where stripe number \a stripe_number is stored
704 * An error return value will result from a NULL layout, if \a
705 * stripe_number is out of range, or if \a layout was not initialized
706 * with llapi_layout_lookup_by{path,fd,fid}().
709 * \retval -1 Invalid argument, errno set to EINVAL.
711 int llapi_layout_ost_index_get(const struct llapi_layout *layout,
712 uint64_t stripe_number, uint64_t *index);
715 * Set the OST index associated with stripe number \a stripe_number to
717 * NB: This is currently supported only for \a stripe_number = 0 and
718 * other usage will return ENOTSUPP in errno. A NULL \a layout or
719 * out-of-range \a stripe_number will return EINVAL in errno.
722 * \retval -1 Error with errno set to non-zero value.
724 int llapi_layout_ost_index_set(struct llapi_layout *layout, int stripe_number,
727 /******************** Pool Name ********************/
730 * Store up to \a pool_name_len characters of the name of the pool of
731 * OSTs associated with \a layout into the buffer pointed to by
734 * The correct calling form is:
736 * llapi_layout_pool_name_get(layout, pool_name, sizeof(pool_name));
738 * A pool defines a set of OSTs from which file objects may be
739 * allocated for a file using \a layout.
741 * On success, the number of bytes stored is returned, excluding the
742 * terminating '\0' character (zero indicates that \a layout does not
743 * have an associated OST pool). On error, -1 is returned and errno is
744 * set appropriately. Possible sources of error include a NULL pointer
745 * argument or insufficient space in \a dest to store the pool name,
746 * in which cases errno will be set to EINVAL.
748 * \retval 0+ The number of bytes stored in \a dest.
749 * \retval -1 Invalid argument, errno set to EINVAL.
751 int llapi_layout_pool_name_get(const struct llapi_layout *layout,
752 char *pool_name, size_t pool_name_len);
755 * Set the name of the pool of OSTs from which file objects will be
756 * allocated to \a pool_name.
758 * If the pool name uses "fsname.pool" notation to qualify the pool name
759 * with a filesystem name, the "fsname." portion will be silently
760 * discarded before storing the value. No validation that \a pool_name
761 * is an existing non-empty pool in filesystem \a fsname will be
762 * performed. Such validation can be performed by the application if
763 * desired using the llapi_search_ost() function. The maximum length of
764 * the stored value is defined by the constant LOV_MAXPOOLNAME.
767 * \retval -1 Invalid argument, errno set to EINVAL.
769 int llapi_layout_pool_name_set(struct llapi_layout *layout,
770 const char *pool_name);
772 /******************** File Creation ********************/
775 * Open an existing file at \a path, or create it with the specified
776 * \a layout and \a mode.
778 * One access mode and zero or more file creation flags and file status
779 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
780 * open file descriptor for the file. If \a layout is non-NULL and
781 * \a path is not on a Lustre filesystem this function will fail and set
784 * An already existing file may be opened with this function, but
785 * \a layout and \a mode will not be applied to it. Callers requiring a
786 * guarantee that the opened file is created with the specified
787 * \a layout and \a mode should use llapi_layout_file_create().
789 * A NULL \a layout may be specified, in which case the standard Lustre
790 * behavior for assigning layouts to newly-created files will apply.
792 * \retval 0+ An open file descriptor.
793 * \retval -1 Error with status code in errno.
795 int llapi_layout_file_open(const char *path, int open_flags, mode_t mode,
796 const struct llapi_layout *layout);
799 * Create a new file at \a path with the specified \a layout and \a mode.
801 * One access mode and zero or more file creation flags and file status
802 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
803 * open file descriptor for the file. If \a layout is non-NULL and
804 * \a path is not on a Lustre filesystem this function will fail and set
809 * llapi_layout_file_create(path, open_flags, mode, layout)
811 * shall be equivalent to:
813 * llapi_layout_file_open(path, open_flags|O_CREAT|O_EXCL, mode, layout)
815 * It is an error if \a path specifies an existing file.
817 * A NULL \a layout may be specified, in which the standard Lustre
818 * behavior for assigning layouts to newly-created files will apply.
820 * \retval 0+ An open file descriptor.
821 * \retval -1 Error with status code in errno.
823 int llapi_layout_file_create(const char *path, int open_flags, int mode,
824 const struct llapi_layout *layout);
827 * Set flags to the header of component layout.
829 int llapi_layout_flags_set(struct llapi_layout *layout, uint32_t flags);
830 int llapi_layout_flags_get(struct llapi_layout *layout, uint32_t *flags);
831 const char *llapi_layout_flags_string(uint32_t flags);
832 const __u16 llapi_layout_string_flags(char *string);
835 * llapi_layout_mirror_count_get() - Get mirror count from the header of
837 * @layout: Layout to get mirror count from.
838 * @count: Returned mirror count value.
840 * This function gets mirror count from the header of a layout.
842 * Return: 0 on success or -1 on failure.
844 int llapi_layout_mirror_count_get(struct llapi_layout *layout,
848 * llapi_layout_mirror_count_set() - Set mirror count to the header of a layout.
849 * @layout: Layout to set mirror count in.
850 * @count: Mirror count value to be set.
852 * This function sets mirror count to the header of a layout.
854 * Return: 0 on success or -1 on failure.
856 int llapi_layout_mirror_count_set(struct llapi_layout *layout,
860 * Fetch the start and end offset of the current layout component.
862 int llapi_layout_comp_extent_get(const struct llapi_layout *layout,
863 uint64_t *start, uint64_t *end);
865 * Set the extent of current layout component.
867 int llapi_layout_comp_extent_set(struct llapi_layout *layout,
868 uint64_t start, uint64_t end);
870 /* PFL component flags table */
871 static const struct comp_flag_name {
872 enum lov_comp_md_entry_flags cfn_flag;
873 const char *cfn_name;
874 } comp_flags_table[] = {
875 { LCME_FL_INIT, "init" },
876 { LCME_FL_STALE, "stale" },
877 { LCME_FL_PREF_RW, "prefer" },
878 { LCME_FL_OFFLINE, "offline" },
879 { LCME_FL_NOSYNC, "nosync" },
883 * Gets the attribute flags of the current component.
885 int llapi_layout_comp_flags_get(const struct llapi_layout *layout,
888 * Sets the specified flags of the current component leaving other flags as-is.
890 int llapi_layout_comp_flags_set(struct llapi_layout *layout, uint32_t flags);
892 * Clears the flags specified in the flags leaving other flags as-is.
894 int llapi_layout_comp_flags_clear(struct llapi_layout *layout, uint32_t flags);
896 * Fetches the file-unique component ID of the current layout component.
898 int llapi_layout_comp_id_get(const struct llapi_layout *layout, uint32_t *id);
900 * Fetches the mirror ID of the current layout component.
902 int llapi_layout_mirror_id_get(const struct llapi_layout *layout, uint32_t *id);
904 * Adds one component to the existing composite or plain layout.
906 int llapi_layout_comp_add(struct llapi_layout *layout);
908 * Adds a first component of a mirror to the existing composite layout.
910 int llapi_layout_add_first_comp(struct llapi_layout *layout);
912 * Deletes the current layout component from the composite layout.
914 int llapi_layout_comp_del(struct llapi_layout *layout);
916 enum llapi_layout_comp_use {
917 LLAPI_LAYOUT_COMP_USE_FIRST = 1,
918 LLAPI_LAYOUT_COMP_USE_LAST = 2,
919 LLAPI_LAYOUT_COMP_USE_NEXT = 3,
920 LLAPI_LAYOUT_COMP_USE_PREV = 4,
924 * Set the currently active component to the specified component ID.
926 int llapi_layout_comp_use_id(struct llapi_layout *layout, uint32_t id);
928 * Select the currently active component at the specified position.
930 int llapi_layout_comp_use(struct llapi_layout *layout, uint32_t pos);
932 * Add layout components to an existing file.
934 int llapi_layout_file_comp_add(const char *path,
935 const struct llapi_layout *layout);
937 * Delete component(s) by the specified component id or flags.
939 int llapi_layout_file_comp_del(const char *path, uint32_t id, uint32_t flags);
941 * Change flags or other parameters of the component(s) by component ID of an
942 * existing file. The component to be modified is specified by the
943 * comp->lcme_id value, which must be an unique component ID. The new
944 * attributes are passed in by @comp and @valid is used to specify which
945 * attributes in the component are going to be changed.
947 int llapi_layout_file_comp_set(const char *path, uint32_t *ids, uint32_t *flags,
950 * Check if the file layout is composite.
952 bool llapi_layout_is_composite(struct llapi_layout *layout);
955 LLAPI_LAYOUT_ITER_CONT = 0,
956 LLAPI_LAYOUT_ITER_STOP = 1,
960 * Iteration callback function.
962 * \retval LLAPI_LAYOUT_ITER_CONT Iteration proceeds
963 * \retval LLAPI_LAYOUT_ITER_STOP Stop iteration
964 * \retval < 0 error code
966 typedef int (*llapi_layout_iter_cb)(struct llapi_layout *layout, void *cbdata);
969 * Iterate all components in the corresponding layout
971 int llapi_layout_comp_iterate(struct llapi_layout *layout,
972 llapi_layout_iter_cb cb, void *cbdata);
975 * FLR: mirror operation APIs
977 int llapi_mirror_set(int fd, unsigned int id);
978 int llapi_mirror_clear(int fd);
979 ssize_t llapi_mirror_read(int fd, unsigned int id,
980 void *buf, size_t count, off_t pos);
981 ssize_t llapi_mirror_copy_many(int fd, unsigned int src,
982 unsigned int *dst, size_t count);
983 int llapi_mirror_copy(int fd, unsigned int src, unsigned int dst,
984 off_t pos, size_t count);
988 #if defined(__cplusplus)