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 #define VERBOSE_COUNT 0x1
153 #define VERBOSE_SIZE 0x2
154 #define VERBOSE_OFFSET 0x4
155 #define VERBOSE_POOL 0x8
156 #define VERBOSE_DETAIL 0x10
157 #define VERBOSE_OBJID 0x20
158 #define VERBOSE_GENERATION 0x40
159 #define VERBOSE_MDTINDEX 0x80
160 #define VERBOSE_LAYOUT 0x100
161 #define VERBOSE_COMP_COUNT 0x200
162 #define VERBOSE_COMP_FLAGS 0x400
163 #define VERBOSE_COMP_START 0x800
164 #define VERBOSE_COMP_END 0x1000
165 #define VERBOSE_COMP_ID 0x2000
166 #define VERBOSE_DFID 0x4000
167 #define VERBOSE_HASH_TYPE 0x8000
168 #define VERBOSE_MIRROR_COUNT 0x10000
169 #define VERBOSE_MIRROR_ID 0x20000
170 #define VERBOSE_DEFAULT (VERBOSE_COUNT | VERBOSE_SIZE | \
171 VERBOSE_OFFSET | VERBOSE_POOL | \
172 VERBOSE_OBJID | VERBOSE_GENERATION | \
173 VERBOSE_LAYOUT | VERBOSE_HASH_TYPE | \
174 VERBOSE_COMP_COUNT | VERBOSE_COMP_FLAGS | \
175 VERBOSE_COMP_START | VERBOSE_COMP_END | \
176 VERBOSE_COMP_ID | VERBOSE_MIRROR_COUNT| \
180 unsigned int fp_max_depth;
182 mode_t fp_type; /* S_IFIFO,... */
188 /* {a,m,c}sign cannot be bitfields due to using pointers to
189 * access them during argument parsing. */
193 /* these need to be signed values */
195 fp_stripe_size_sign:2,
196 fp_stripe_count_sign:2,
197 fp_comp_start_sign:2,
199 fp_comp_count_sign:2,
201 unsigned long long fp_size;
202 unsigned long long fp_size_units;
204 unsigned long long fp_zero_end:1,
206 fp_exclude_pattern:1,
214 fp_check_pool:1, /* LOV pool name */
215 fp_check_size:1, /* file size */
221 fp_get_lmv:1, /* get MDT list from LMV */
222 fp_raw:1, /* do not fill in defaults */
223 fp_check_stripe_size:1, /* LOV stripe size */
224 fp_exclude_stripe_size:1,
225 fp_check_stripe_count:1, /* LOV stripe count */
226 fp_exclude_stripe_count:1,
229 fp_get_default_lmv:1, /* Get default LMV */
233 fp_check_comp_count:1,
234 fp_exclude_comp_count:1,
235 fp_check_comp_flags:1,
236 fp_check_comp_start:1,
237 fp_exclude_comp_start:1,
239 fp_exclude_comp_end:1,
241 fp_exclude_comp_id:1,
242 fp_check_mdt_count:1,
243 fp_exclude_mdt_count:1,
244 fp_check_hash_type:1,
245 fp_exclude_hash_type:1,
246 fp_yaml:1; /* output layout in YAML */
251 /* regular expression */
254 struct obd_uuid *fp_obd_uuid;
256 int fp_num_alloc_obds;
260 struct obd_uuid *fp_mdt_uuid;
262 int fp_num_alloc_mdts;
265 int fp_file_mdt_index;
268 struct lov_user_mds_data *fp_lmd;
270 char fp_poolname[LOV_MAXPOOLNAME + 1];
272 __u32 fp_lmv_stripe_count;
273 struct lmv_user_md *fp_lmv_md;
275 unsigned long long fp_stripe_size;
276 unsigned long long fp_stripe_size_units;
277 unsigned long long fp_stripe_count;
282 __u32 fp_comp_neg_flags;
284 unsigned long long fp_comp_start;
285 unsigned long long fp_comp_start_units;
286 unsigned long long fp_comp_end;
287 unsigned long long fp_comp_end_units;
288 unsigned long long fp_mdt_count;
291 /* In-process parameters. */
292 unsigned long fp_got_uuids:1,
294 unsigned int fp_depth;
295 unsigned int fp_hash_type;
298 int llapi_ostlist(char *path, struct find_param *param);
299 int llapi_uuid_match(char *real_uuid, char *search_uuid);
300 int llapi_getstripe(char *path, struct find_param *param);
301 int llapi_find(char *path, struct find_param *param);
303 int llapi_file_fget_mdtidx(int fd, int *mdtidx);
304 int llapi_dir_set_default_lmv(const char *name,
305 const struct llapi_stripe_param *param);
306 int llapi_dir_set_default_lmv_stripe(const char *name, int stripe_offset,
307 int stripe_count, int stripe_pattern,
308 const char *pool_name);
309 int llapi_dir_create_param(const char *name, mode_t mode,
310 const struct llapi_stripe_param *param);
311 int llapi_dir_create_pool(const char *name, int flags, int stripe_offset,
312 int stripe_count, int stripe_pattern,
313 const char *poolname);
314 int llapi_direntry_remove(char *dname);
316 int llapi_obd_fstatfs(int fd, __u32 type, __u32 index,
317 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
318 int llapi_obd_statfs(char *path, __u32 type, __u32 index,
319 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
320 int llapi_ping(char *obd_type, char *obd_name);
321 int llapi_target_check(int num_types, char **obd_types, char *dir);
322 int llapi_file_get_lov_uuid(const char *path, struct obd_uuid *lov_uuid);
323 int llapi_file_get_lmv_uuid(const char *path, struct obd_uuid *lmv_uuid);
324 int llapi_file_fget_lov_uuid(int fd, struct obd_uuid *lov_uuid);
325 int llapi_lov_get_uuids(int fd, struct obd_uuid *uuidp, int *ost_count);
326 int llapi_lmv_get_uuids(int fd, struct obd_uuid *uuidp, int *mdt_count);
327 int llapi_is_lustre_mnttype(const char *type);
328 int llapi_search_tgt(char *fsname, char *poolname, char *tgtname, bool is_mdt);
329 int llapi_search_ost(char *fsname, char *poolname, char *ostname);
330 int llapi_get_obd_count(char *mnt, int *count, int is_mdt);
331 int llapi_parse_size(const char *optarg, unsigned long long *size,
332 unsigned long long *size_units, int bytes_spec);
333 int llapi_search_mounts(const char *pathname, int index, char *mntdir,
335 int llapi_search_fsname(const char *pathname, char *fsname);
336 int llapi_getname(const char *path, char *buf, size_t size);
337 int llapi_search_fileset(const char *pathname, char *fileset);
339 int llapi_search_rootpath(char *pathname, const char *fsname);
340 int llapi_nodemap_exists(const char *name);
341 int llapi_migrate_mdt(char *path, struct find_param *param);
342 int llapi_mv(char *path, struct find_param *param);
346 #define HAVE_LLAPI_IS_LUSTRE_MNT
347 int llapi_is_lustre_mnt(struct mntent *mnt);
348 int llapi_quotactl(char *mnt, struct if_quotactl *qctl);
349 int llapi_target_iterate(int type_num, char **obd_type, void *args,
351 int llapi_get_connect_flags(const char *mnt, __u64 *flags);
352 int llapi_cp(int argc, char *argv[]);
353 int llapi_ls(int argc, char *argv[]);
354 int llapi_fid2path(const char *device, const char *fidstr, char *path,
355 int pathlen, long long *recno, int *linkno);
356 int llapi_path2fid(const char *path, struct lu_fid *fid);
357 int llapi_get_mdt_index_by_fid(int fd, const struct lu_fid *fid,
359 int llapi_fd2fid(int fd, struct lu_fid *fid);
360 /* get FID of parent dir + the related name of entry in this parent dir */
361 int llapi_path2parent(const char *path, unsigned int linkno,
362 struct lu_fid *parent_fid, char *name, size_t name_size);
363 int llapi_fd2parent(int fd, unsigned int linkno, struct lu_fid *parent_fid,
364 char *name, size_t name_size);
365 int llapi_chomp_string(char *buf);
366 int llapi_open_by_fid(const char *dir, const struct lu_fid *fid,
368 int llapi_get_version_string(char *version, unsigned int version_size);
369 /* llapi_get_version() is deprecated, use llapi_get_version_string() instead */
370 int llapi_get_version(char *buffer, int buffer_size, char **version)
371 __attribute__((deprecated));
372 int llapi_get_data_version(int fd, __u64 *data_version, __u64 flags);
373 int llapi_file_flush(int fd);
374 extern int llapi_get_ost_layout_version(int fd, __u32 *layout_version);
375 int llapi_hsm_state_get_fd(int fd, struct hsm_user_state *hus);
376 int llapi_hsm_state_get(const char *path, struct hsm_user_state *hus);
377 int llapi_hsm_state_set_fd(int fd, __u64 setmask, __u64 clearmask,
379 int llapi_hsm_state_set(const char *path, __u64 setmask, __u64 clearmask,
381 int llapi_hsm_register_event_fifo(const char *path);
382 int llapi_hsm_unregister_event_fifo(const char *path);
383 void llapi_hsm_log_error(enum llapi_message_level level, int _rc,
384 const char *fmt, va_list args);
386 int llapi_get_agent_uuid(char *path, char *buf, size_t bufsize);
387 int llapi_create_volatile_idx(char *directory, int idx, int mode);
389 static inline int llapi_create_volatile(char *directory, int mode)
391 return llapi_create_volatile_idx(directory, -1, mode);
395 int llapi_fswap_layouts_grouplock(int fd1, int fd2, __u64 dv1, __u64 dv2,
396 int gid, __u64 flags);
397 int llapi_fswap_layouts(int fd1, int fd2, __u64 dv1, __u64 dv2, __u64 flags);
398 int llapi_swap_layouts(const char *path1, const char *path2, __u64 dv1,
399 __u64 dv2, __u64 flags);
401 /* Changelog interface. priv is private state, managed internally by these
404 /* Records received are in extended format now, though most of them are still
405 * written in disk in changelog_rec format (to save space and time), it's
406 * converted to extended format in the lustre api to ease changelog analysis. */
407 #define HAVE_CHANGELOG_EXTEND_REC 1
409 int llapi_changelog_start(void **priv, enum changelog_send_flag flags,
410 const char *mdtname, long long startrec);
411 int llapi_changelog_fini(void **priv);
412 int llapi_changelog_recv(void *priv, struct changelog_rec **rech);
413 int llapi_changelog_free(struct changelog_rec **rech);
414 int llapi_changelog_get_fd(void *priv);
415 /* Allow records up to endrec to be destroyed; requires registered id. */
416 int llapi_changelog_clear(const char *mdtname, const char *idstr,
418 extern int llapi_changelog_set_xflags(void *priv,
419 enum changelog_send_extra_flag extra_flags);
421 /* HSM copytool interface.
422 * priv is private state, managed internally by these functions
424 struct hsm_copytool_private;
425 struct hsm_copyaction_private;
427 int llapi_hsm_copytool_register(struct hsm_copytool_private **priv,
428 const char *mnt, int archive_count,
429 int *archives, int rfd_flags);
430 int llapi_hsm_copytool_unregister(struct hsm_copytool_private **priv);
431 int llapi_hsm_copytool_get_fd(struct hsm_copytool_private *ct);
432 int llapi_hsm_copytool_recv(struct hsm_copytool_private *priv,
433 struct hsm_action_list **hal, int *msgsize);
434 int llapi_hsm_action_begin(struct hsm_copyaction_private **phcp,
435 const struct hsm_copytool_private *ct,
436 const struct hsm_action_item *hai,
437 int restore_mdt_index, int restore_open_flags,
439 int llapi_hsm_action_end(struct hsm_copyaction_private **phcp,
440 const struct hsm_extent *he, int hp_flags, int errval);
441 int llapi_hsm_action_progress(struct hsm_copyaction_private *hcp,
442 const struct hsm_extent *he, __u64 total,
444 int llapi_hsm_action_get_dfid(const struct hsm_copyaction_private *hcp,
446 int llapi_hsm_action_get_fd(const struct hsm_copyaction_private *hcp);
447 int llapi_hsm_import(const char *dst, int archive, const struct stat *st,
448 unsigned long long stripe_size, int stripe_offset,
449 int stripe_count, int stripe_pattern, char *pool_name,
450 struct lu_fid *newfid);
452 /* HSM user interface */
453 struct hsm_user_request *llapi_hsm_user_request_alloc(int itemcount,
455 int llapi_hsm_request(const char *path, const struct hsm_user_request *request);
456 int llapi_hsm_current_action(const char *path, struct hsm_current_action *hca);
459 int llapi_json_init_list(struct llapi_json_item_list **item_list);
460 int llapi_json_destroy_list(struct llapi_json_item_list **item_list);
461 int llapi_json_add_item(struct llapi_json_item_list **item_list, char *key,
462 __u32 type, void *val);
463 int llapi_json_write_list(struct llapi_json_item_list **item_list, FILE *fp);
466 int llapi_lease_acquire(int fd, enum ll_lease_mode mode);
467 int llapi_lease_release(int fd);
468 int llapi_lease_set(int fd, const struct ll_ioc_lease *data);
469 int llapi_lease_check(int fd);
470 int llapi_lease_get(int fd, int mode); /* obsoleted */
471 int llapi_lease_put(int fd); /* obsoleted */
474 int llapi_group_lock(int fd, int gid);
475 int llapi_group_unlock(int fd, int gid);
478 int llapi_ladvise(int fd, unsigned long long flags, int num_advise,
479 struct llapi_lu_ladvise *ladvise);
482 /* llapi_layout user interface */
484 static inline const char *lcm_flags_string(__u16 flags)
486 switch (flags & LCM_FL_FLR_MASK) {
491 case LCM_FL_WRITE_PENDING:
493 case LCM_FL_SYNC_PENDING:
501 * An array element storing component info to be resynced during mirror
504 struct llapi_resync_comp {
507 uint32_t lrc_mirror_id;
508 uint32_t lrc_id; /* component id */
512 /** Opaque data type abstracting the layout of a Lustre file. */
515 int llapi_mirror_find_stale(struct llapi_layout *layout,
516 struct llapi_resync_comp *comp, size_t comp_size,
517 __u16 *mirror_ids, int ids_nr);
518 ssize_t llapi_mirror_resync_one(int fd, struct llapi_layout *layout,
519 uint32_t dst, uint64_t start, uint64_t end);
521 * Flags to control how layouts are retrieved.
524 /* Replace non-specified values with expected inherited values. */
525 #define LAYOUT_GET_EXPECTED 0x1
528 * Return a pointer to a newly-allocated opaque data structure containing
529 * the layout for the file at \a path. The pointer should be freed with
530 * llapi_layout_free() when it is no longer needed. Failure is indicated
531 * by a NULL return value and an appropriate error code stored in errno.
533 struct llapi_layout *llapi_layout_get_by_path(const char *path, uint32_t flags);
536 * Return a pointer to a newly-allocated opaque data type containing the
537 * layout for the file referenced by open file descriptor \a fd. The
538 * pointer should be freed with llapi_layout_free() when it is no longer
539 * needed. Failure is indicated by a NULL return value and an
540 * appropriate error code stored in errno.
542 struct llapi_layout *llapi_layout_get_by_fd(int fd, uint32_t flags);
545 * Return a pointer to a newly-allocated opaque data type containing the
546 * layout for the file associated with Lustre file identifier string
547 * \a fidstr. The string \a path must name a path within the
548 * filesystem that contains the file being looked up, such as the
549 * filesystem root. The returned pointer should be freed with
550 * llapi_layout_free() when it is no longer needed. Failure is
551 * indicated with a NULL return value and an appropriate error code
554 struct llapi_layout *llapi_layout_get_by_fid(const char *path,
555 const struct lu_fid *fid,
559 * Allocate a new layout. Use this when creating a new file with
560 * llapi_layout_file_create().
562 struct llapi_layout *llapi_layout_alloc(void);
565 * Free memory allocated for \a layout.
567 void llapi_layout_free(struct llapi_layout *layout);
570 * llapi_layout_merge() - Merge a composite layout into another one.
571 * @dst_layout: Destination composite layout.
572 * @src_layout: Source composite layout.
574 * This function copies all of the components from @src_layout and
575 * appends them to @dst_layout.
577 * Return: 0 on success or -1 on failure.
579 int llapi_layout_merge(struct llapi_layout **dst_layout,
580 const struct llapi_layout *src_layout);
582 /** Not a valid stripe size, offset, or RAID pattern. */
583 #define LLAPI_LAYOUT_INVALID 0x1000000000000001ULL
586 * When specified or returned as the value for stripe count,
587 * stripe size, offset, or RAID pattern, the filesystem-wide
588 * default behavior will apply.
590 #define LLAPI_LAYOUT_DEFAULT (LLAPI_LAYOUT_INVALID + 1)
593 * When specified or returned as the value for stripe count, all
594 * available OSTs will be used.
596 #define LLAPI_LAYOUT_WIDE (LLAPI_LAYOUT_INVALID + 2)
599 * When specified as the value for layout pattern, file objects will be
600 * stored using RAID0. That is, data will be split evenly and without
601 * redundancy across all OSTs in the layout.
603 #define LLAPI_LAYOUT_RAID0 0ULL
604 #define LLAPI_LAYOUT_MDT 2ULL
607 * The layout includes a specific set of OSTs on which to allocate.
609 #define LLAPI_LAYOUT_SPECIFIC 0x2000000000000000ULL
612 * A valid ost index should be less than maximum valid OST index (UINT_MAX).
614 #define LLAPI_LAYOUT_IDX_MAX 0x00000000FFFFFFFFULL
617 * Flags to modify how layouts are retrieved.
619 /******************** Stripe Count ********************/
622 * Store the stripe count of \a layout in \a count.
625 * \retval -1 Error with status code in errno.
627 int llapi_layout_stripe_count_get(const struct llapi_layout *layout,
631 * Set the stripe count of \a layout to \a count.
634 * \retval -1 Invalid argument, errno set to EINVAL.
636 int llapi_layout_stripe_count_set(struct llapi_layout *layout, uint64_t count);
638 /******************** Stripe Size ********************/
641 * Store the stripe size of \a layout in \a size.
644 * \retval -1 Invalid argument, errno set to EINVAL.
646 int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
650 * Set the stripe size of \a layout to \a stripe_size.
653 * \retval -1 Invalid argument, errno set to EINVAL.
655 int llapi_layout_stripe_size_set(struct llapi_layout *layout, uint64_t size);
657 /******************** Stripe Pattern ********************/
660 * Store the stripe pattern of \a layout in \a pattern.
663 * \retval -1 Error with status code in errno.
665 int llapi_layout_pattern_get(const struct llapi_layout *layout,
669 * Set the stripe pattern of \a layout to \a pattern.
672 * \retval -1 Invalid argument, errno set to EINVAL.
674 int llapi_layout_pattern_set(struct llapi_layout *layout, uint64_t pattern);
676 /******************** OST Index ********************/
679 * Store the index of the OST where stripe number \a stripe_number is stored
682 * An error return value will result from a NULL layout, if \a
683 * stripe_number is out of range, or if \a layout was not initialized
684 * with llapi_layout_lookup_by{path,fd,fid}().
687 * \retval -1 Invalid argument, errno set to EINVAL.
689 int llapi_layout_ost_index_get(const struct llapi_layout *layout,
690 uint64_t stripe_number, uint64_t *index);
693 * Set the OST index associated with stripe number \a stripe_number to
695 * NB: This is currently supported only for \a stripe_number = 0 and
696 * other usage will return ENOTSUPP in errno. A NULL \a layout or
697 * out-of-range \a stripe_number will return EINVAL in errno.
700 * \retval -1 Error with errno set to non-zero value.
702 int llapi_layout_ost_index_set(struct llapi_layout *layout, int stripe_number,
705 /******************** Pool Name ********************/
708 * Store up to \a pool_name_len characters of the name of the pool of
709 * OSTs associated with \a layout into the buffer pointed to by
712 * The correct calling form is:
714 * llapi_layout_pool_name_get(layout, pool_name, sizeof(pool_name));
716 * A pool defines a set of OSTs from which file objects may be
717 * allocated for a file using \a layout.
719 * On success, the number of bytes stored is returned, excluding the
720 * terminating '\0' character (zero indicates that \a layout does not
721 * have an associated OST pool). On error, -1 is returned and errno is
722 * set appropriately. Possible sources of error include a NULL pointer
723 * argument or insufficient space in \a dest to store the pool name,
724 * in which cases errno will be set to EINVAL.
726 * \retval 0+ The number of bytes stored in \a dest.
727 * \retval -1 Invalid argument, errno set to EINVAL.
729 int llapi_layout_pool_name_get(const struct llapi_layout *layout,
730 char *pool_name, size_t pool_name_len);
733 * Set the name of the pool of OSTs from which file objects will be
734 * allocated to \a pool_name.
736 * If the pool name uses "fsname.pool" notation to qualify the pool name
737 * with a filesystem name, the "fsname." portion will be silently
738 * discarded before storing the value. No validation that \a pool_name
739 * is an existing non-empty pool in filesystem \a fsname will be
740 * performed. Such validation can be performed by the application if
741 * desired using the llapi_search_ost() function. The maximum length of
742 * the stored value is defined by the constant LOV_MAXPOOLNAME.
745 * \retval -1 Invalid argument, errno set to EINVAL.
747 int llapi_layout_pool_name_set(struct llapi_layout *layout,
748 const char *pool_name);
750 /******************** File Creation ********************/
753 * Open an existing file at \a path, or create it with the specified
754 * \a layout and \a mode.
756 * One access mode and zero or more file creation flags and file status
757 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
758 * open file descriptor for the file. If \a layout is non-NULL and
759 * \a path is not on a Lustre filesystem this function will fail and set
762 * An already existing file may be opened with this function, but
763 * \a layout and \a mode will not be applied to it. Callers requiring a
764 * guarantee that the opened file is created with the specified
765 * \a layout and \a mode should use llapi_layout_file_create().
767 * A NULL \a layout may be specified, in which case the standard Lustre
768 * behavior for assigning layouts to newly-created files will apply.
770 * \retval 0+ An open file descriptor.
771 * \retval -1 Error with status code in errno.
773 int llapi_layout_file_open(const char *path, int open_flags, mode_t mode,
774 const struct llapi_layout *layout);
777 * Create a new file at \a path with the specified \a layout and \a mode.
779 * One access mode and zero or more file creation flags and file status
780 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
781 * open file descriptor for the file. If \a layout is non-NULL and
782 * \a path is not on a Lustre filesystem this function will fail and set
787 * llapi_layout_file_create(path, open_flags, mode, layout)
789 * shall be equivalent to:
791 * llapi_layout_file_open(path, open_flags|O_CREAT|O_EXCL, mode, layout)
793 * It is an error if \a path specifies an existing file.
795 * A NULL \a layout may be specified, in which the standard Lustre
796 * behavior for assigning layouts to newly-created files will apply.
798 * \retval 0+ An open file descriptor.
799 * \retval -1 Error with status code in errno.
801 int llapi_layout_file_create(const char *path, int open_flags, int mode,
802 const struct llapi_layout *layout);
805 * Set flags to the header of component layout.
807 int llapi_layout_flags_set(struct llapi_layout *layout, uint32_t flags);
808 int llapi_layout_flags_get(struct llapi_layout *layout, uint32_t *flags);
811 * llapi_layout_mirror_count_get() - Get mirror count from the header of
813 * @layout: Layout to get mirror count from.
814 * @count: Returned mirror count value.
816 * This function gets mirror count from the header of a layout.
818 * Return: 0 on success or -1 on failure.
820 int llapi_layout_mirror_count_get(struct llapi_layout *layout,
824 * llapi_layout_mirror_count_set() - Set mirror count to the header of a layout.
825 * @layout: Layout to set mirror count in.
826 * @count: Mirror count value to be set.
828 * This function sets mirror count to the header of a layout.
830 * Return: 0 on success or -1 on failure.
832 int llapi_layout_mirror_count_set(struct llapi_layout *layout,
836 * Fetch the start and end offset of the current layout component.
838 int llapi_layout_comp_extent_get(const struct llapi_layout *layout,
839 uint64_t *start, uint64_t *end);
841 * Set the extent of current layout component.
843 int llapi_layout_comp_extent_set(struct llapi_layout *layout,
844 uint64_t start, uint64_t end);
846 /* PFL component flags table */
847 static const struct comp_flag_name {
848 enum lov_comp_md_entry_flags cfn_flag;
849 const char *cfn_name;
850 } comp_flags_table[] = {
851 { LCME_FL_INIT, "init" },
852 { LCME_FL_STALE, "stale" },
853 { LCME_FL_PREF_RW, "prefer" },
854 { LCME_FL_OFFLINE, "offline" },
858 * Gets the attribute flags of the current component.
860 int llapi_layout_comp_flags_get(const struct llapi_layout *layout,
863 * Sets the specified flags of the current component leaving other flags as-is.
865 int llapi_layout_comp_flags_set(struct llapi_layout *layout, uint32_t flags);
867 * Clears the flags specified in the flags leaving other flags as-is.
869 int llapi_layout_comp_flags_clear(struct llapi_layout *layout, uint32_t flags);
871 * Fetches the file-unique component ID of the current layout component.
873 int llapi_layout_comp_id_get(const struct llapi_layout *layout, uint32_t *id);
875 * Fetches the mirror ID of the current layout component.
877 int llapi_layout_mirror_id_get(const struct llapi_layout *layout, uint32_t *id);
879 * Adds one component to the existing composite or plain layout.
881 int llapi_layout_comp_add(struct llapi_layout *layout);
883 * Deletes the current layout component from the composite layout.
885 int llapi_layout_comp_del(struct llapi_layout *layout);
887 enum llapi_layout_comp_use {
888 LLAPI_LAYOUT_COMP_USE_FIRST = 1,
889 LLAPI_LAYOUT_COMP_USE_LAST = 2,
890 LLAPI_LAYOUT_COMP_USE_NEXT = 3,
891 LLAPI_LAYOUT_COMP_USE_PREV = 4,
895 * Set the currently active component to the specified component ID.
897 int llapi_layout_comp_use_id(struct llapi_layout *layout, uint32_t id);
899 * Select the currently active component at the specified position.
901 int llapi_layout_comp_use(struct llapi_layout *layout, uint32_t pos);
903 * Add layout components to an existing file.
905 int llapi_layout_file_comp_add(const char *path,
906 const struct llapi_layout *layout);
908 * Delete component(s) by the specified component id or flags.
910 int llapi_layout_file_comp_del(const char *path, uint32_t id, uint32_t flags);
912 * Change flags or other parameters of the component(s) by component ID of an
913 * existing file. The component to be modified is specified by the
914 * comp->lcme_id value, which must be an unique component ID. The new
915 * attributes are passed in by @comp and @valid is used to specify which
916 * attributes in the component are going to be changed.
918 int llapi_layout_file_comp_set(const char *path, uint32_t *ids, uint32_t *flags,
921 * Check if the file layout is composite.
923 bool llapi_layout_is_composite(struct llapi_layout *layout);
926 LLAPI_LAYOUT_ITER_CONT = 0,
927 LLAPI_LAYOUT_ITER_STOP = 1,
931 * Iteration callback function.
933 * \retval LLAPI_LAYOUT_ITER_CONT Iteration proceeds
934 * \retval LLAPI_LAYOUT_ITER_STOP Stop iteration
935 * \retval < 0 error code
937 typedef int (*llapi_layout_iter_cb)(struct llapi_layout *layout, void *cbdata);
940 * Iterate all components in the corresponding layout
942 int llapi_layout_comp_iterate(struct llapi_layout *layout,
943 llapi_layout_iter_cb cb, void *cbdata);
946 * FLR: mirror operation APIs
948 int llapi_mirror_set(int fd, unsigned int id);
949 int llapi_mirror_clear(int fd);
950 ssize_t llapi_mirror_read(int fd, unsigned int id,
951 void *buf, size_t count, off_t pos);
952 ssize_t llapi_mirror_copy_many(int fd, unsigned int src,
953 unsigned int *dst, size_t count);
954 int llapi_mirror_copy(int fd, unsigned int src, unsigned int dst,
955 off_t pos, size_t count);
959 #if defined(__cplusplus)