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, 2016, 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>
46 #define LL_MAXQUOTAS 3
50 #define ARRAY_SIZE(a) ((sizeof(a)) / (sizeof((a)[0])))
53 extern bool liblustreapi_initialized;
56 typedef void (*llapi_cb_t)(char *obd_type_name, char *obd_name, char *obd_uuid,
59 /* lustreapi message severity level */
60 enum llapi_message_level {
71 typedef void (*llapi_log_callback_t)(enum llapi_message_level level, int err,
72 const char *fmt, va_list ap);
75 /* the bottom three bits reserved for llapi_message_level */
76 #define LLAPI_MSG_MASK 0x00000007
77 #define LLAPI_MSG_NO_ERRNO 0x00000010
79 static inline const char *llapi_msg_level2str(enum llapi_message_level level)
81 static const char *levels[LLAPI_MSG_MAX] = {"OFF", "FATAL", "ERROR",
85 if (level >= LLAPI_MSG_MAX)
91 void llapi_msg_set_level(int level);
92 int llapi_msg_get_level(void);
93 llapi_log_callback_t llapi_error_callback_set(llapi_log_callback_t cb);
94 llapi_log_callback_t llapi_info_callback_set(llapi_log_callback_t cb);
96 void llapi_error(enum llapi_message_level level, int err, const char *fmt, ...)
97 __attribute__((__format__(__printf__, 3, 4)));
98 #define llapi_err_noerrno(level, fmt, a...) \
99 llapi_error((level) | LLAPI_MSG_NO_ERRNO, 0, fmt, ## a)
100 void llapi_printf(enum llapi_message_level level, const char *fmt, ...)
101 __attribute__((__format__(__printf__, 2, 3)));
103 struct llapi_stripe_param {
104 unsigned long long lsp_stripe_size;
106 int lsp_stripe_offset;
107 int lsp_stripe_pattern;
108 /* Number of stripes. Size of lsp_osts[] if lsp_specific is true.*/
109 int lsp_stripe_count;
110 bool lsp_is_specific;
114 int llapi_file_open_param(const char *name, int flags, mode_t mode,
115 const struct llapi_stripe_param *param);
116 int llapi_file_create(const char *name, unsigned long long stripe_size,
117 int stripe_offset, int stripe_count, int stripe_pattern);
118 int llapi_file_open(const char *name, int flags, int mode,
119 unsigned long long stripe_size, int stripe_offset,
120 int stripe_count, int stripe_pattern);
121 int llapi_file_create_pool(const char *name, unsigned long long stripe_size,
122 int stripe_offset, int stripe_count,
123 int stripe_pattern, char *pool_name);
124 int llapi_file_open_pool(const char *name, int flags, int mode,
125 unsigned long long stripe_size, int stripe_offset,
126 int stripe_count, int stripe_pattern, char *pool_name);
127 int llapi_poollist(const char *name);
128 int llapi_get_poollist(const char *name, char **poollist, int list_size,
129 char *buffer, int buffer_size);
130 int llapi_get_poolmembers(const char *poolname, char **members, int list_size,
131 char *buffer, int buffer_size);
132 int llapi_file_get_stripe(const char *path, struct lov_user_md *lum);
133 int llapi_file_lookup(int dirfd, const char *name);
135 #define VERBOSE_COUNT 0x1
136 #define VERBOSE_SIZE 0x2
137 #define VERBOSE_OFFSET 0x4
138 #define VERBOSE_POOL 0x8
139 #define VERBOSE_DETAIL 0x10
140 #define VERBOSE_OBJID 0x20
141 #define VERBOSE_GENERATION 0x40
142 #define VERBOSE_MDTINDEX 0x80
143 #define VERBOSE_LAYOUT 0x100
144 #define VERBOSE_COMP_COUNT 0x200
145 #define VERBOSE_COMP_FLAGS 0x400
146 #define VERBOSE_COMP_START 0x800
147 #define VERBOSE_COMP_END 0x1000
148 #define VERBOSE_COMP_ID 0x2000
149 #define VERBOSE_DFID 0x4000
150 #define VERBOSE_HASH_TYPE 0x8000
151 #define VERBOSE_DEFAULT (VERBOSE_COUNT | VERBOSE_SIZE | \
152 VERBOSE_OFFSET | VERBOSE_POOL | \
153 VERBOSE_OBJID | VERBOSE_GENERATION | \
154 VERBOSE_LAYOUT | VERBOSE_HASH_TYPE | \
155 VERBOSE_COMP_COUNT | VERBOSE_COMP_FLAGS | \
156 VERBOSE_COMP_START | VERBOSE_COMP_END | \
160 unsigned int fp_max_depth;
162 mode_t fp_type; /* S_IFIFO,... */
168 /* {a,m,c}sign cannot be bitfields due to using pointers to
169 * access them during argument parsing. */
173 /* these need to be signed values */
175 fp_stripe_size_sign:2,
176 fp_stripe_count_sign:2,
177 fp_comp_start_sign:2,
179 fp_comp_count_sign:2,
181 unsigned long long fp_size;
182 unsigned long long fp_size_units;
184 unsigned long long fp_zero_end:1,
186 fp_exclude_pattern:1,
194 fp_check_pool:1, /* LOV pool name */
195 fp_check_size:1, /* file size */
201 fp_get_lmv:1, /* get MDT list from LMV */
202 fp_raw:1, /* do not fill in defaults */
203 fp_check_stripe_size:1, /* LOV stripe size */
204 fp_exclude_stripe_size:1,
205 fp_check_stripe_count:1, /* LOV stripe count */
206 fp_exclude_stripe_count:1,
209 fp_get_default_lmv:1, /* Get default LMV */
213 fp_check_comp_count:1,
214 fp_exclude_comp_count:1,
215 fp_check_comp_flags:1,
216 fp_exclude_comp_flags:1,
217 fp_check_comp_start:1,
218 fp_exclude_comp_start:1,
220 fp_exclude_comp_end:1,
222 fp_exclude_comp_id:1,
223 fp_check_mdt_count:1,
224 fp_exclude_mdt_count:1,
225 fp_check_hash_type:1,
226 fp_exclude_hash_type:1,
227 fp_yaml:1; /* output layout in YAML */
232 /* regular expression */
235 struct obd_uuid *fp_obd_uuid;
237 int fp_num_alloc_obds;
241 struct obd_uuid *fp_mdt_uuid;
243 int fp_num_alloc_mdts;
246 int fp_file_mdt_index;
249 struct lov_user_mds_data *fp_lmd;
251 char fp_poolname[LOV_MAXPOOLNAME + 1];
253 __u32 fp_lmv_stripe_count;
254 struct lmv_user_md *fp_lmv_md;
256 unsigned long long fp_stripe_size;
257 unsigned long long fp_stripe_size_units;
258 unsigned long long fp_stripe_count;
264 unsigned long long fp_comp_start;
265 unsigned long long fp_comp_start_units;
266 unsigned long long fp_comp_end;
267 unsigned long long fp_comp_end_units;
268 unsigned long long fp_mdt_count;
271 /* In-process parameters. */
272 unsigned long fp_got_uuids:1,
274 unsigned int fp_depth;
275 unsigned int fp_hash_type;
278 int llapi_ostlist(char *path, struct find_param *param);
279 int llapi_uuid_match(char *real_uuid, char *search_uuid);
280 int llapi_getstripe(char *path, struct find_param *param);
281 int llapi_find(char *path, struct find_param *param);
283 int llapi_file_fget_mdtidx(int fd, int *mdtidx);
284 int llapi_dir_set_default_lmv_stripe(const char *name, int stripe_offset,
285 int stripe_count, int stripe_pattern,
286 const char *pool_name);
287 int llapi_dir_create_pool(const char *name, int flags, int stripe_offset,
288 int stripe_count, int stripe_pattern,
289 const char *poolname);
290 int llapi_direntry_remove(char *dname);
292 int llapi_obd_fstatfs(int fd, __u32 type, __u32 index,
293 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
294 int llapi_obd_statfs(char *path, __u32 type, __u32 index,
295 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
296 int llapi_ping(char *obd_type, char *obd_name);
297 int llapi_target_check(int num_types, char **obd_types, char *dir);
298 int llapi_file_get_lov_uuid(const char *path, struct obd_uuid *lov_uuid);
299 int llapi_file_get_lmv_uuid(const char *path, struct obd_uuid *lmv_uuid);
300 int llapi_file_fget_lov_uuid(int fd, struct obd_uuid *lov_uuid);
301 int llapi_lov_get_uuids(int fd, struct obd_uuid *uuidp, int *ost_count);
302 int llapi_lmv_get_uuids(int fd, struct obd_uuid *uuidp, int *mdt_count);
303 int llapi_is_lustre_mnttype(const char *type);
304 int llapi_search_ost(char *fsname, char *poolname, char *ostname);
305 int llapi_get_obd_count(char *mnt, int *count, int is_mdt);
306 int llapi_parse_size(const char *optarg, unsigned long long *size,
307 unsigned long long *size_units, int bytes_spec);
308 int llapi_search_mounts(const char *pathname, int index, char *mntdir,
310 int llapi_search_fsname(const char *pathname, char *fsname);
311 int llapi_getname(const char *path, char *buf, size_t size);
312 int llapi_search_fileset(const char *pathname, char *fileset);
314 int llapi_search_rootpath(char *pathname, const char *fsname);
315 int llapi_nodemap_exists(const char *name);
316 int llapi_migrate_mdt(char *path, struct find_param *param);
317 int llapi_mv(char *path, struct find_param *param);
320 #define HAVE_LLAPI_IS_LUSTRE_MNT
321 int llapi_is_lustre_mnt(struct mntent *mnt);
322 int llapi_quotactl(char *mnt, struct if_quotactl *qctl);
323 int llapi_target_iterate(int type_num, char **obd_type, void *args,
325 int llapi_get_connect_flags(const char *mnt, __u64 *flags);
326 int llapi_cp(int argc, char *argv[]);
327 int llapi_ls(int argc, char *argv[]);
328 int llapi_fid2path(const char *device, const char *fidstr, char *path,
329 int pathlen, long long *recno, int *linkno);
330 int llapi_path2fid(const char *path, lustre_fid *fid);
331 int llapi_get_mdt_index_by_fid(int fd, const lustre_fid *fid, int *mdt_index);
332 int llapi_fd2fid(int fd, lustre_fid *fid);
333 /* get FID of parent dir + the related name of entry in this parent dir */
334 int llapi_path2parent(const char *path, unsigned int linkno,
335 lustre_fid *parent_fid, char *name, size_t name_size);
336 int llapi_fd2parent(int fd, unsigned int linkno, lustre_fid *parent_fid,
337 char *name, size_t name_size);
338 int llapi_chomp_string(char *buf);
339 int llapi_open_by_fid(const char *dir, const lustre_fid *fid, int open_flags);
341 int llapi_get_version_string(char *version, unsigned int version_size);
342 /* llapi_get_version() is deprecated, use llapi_get_version_string() instead */
343 int llapi_get_version(char *buffer, int buffer_size, char **version)
344 __attribute__((deprecated));
345 int llapi_get_data_version(int fd, __u64 *data_version, __u64 flags);
346 int llapi_hsm_state_get_fd(int fd, struct hsm_user_state *hus);
347 int llapi_hsm_state_get(const char *path, struct hsm_user_state *hus);
348 int llapi_hsm_state_set_fd(int fd, __u64 setmask, __u64 clearmask,
350 int llapi_hsm_state_set(const char *path, __u64 setmask, __u64 clearmask,
352 int llapi_hsm_register_event_fifo(const char *path);
353 int llapi_hsm_unregister_event_fifo(const char *path);
354 void llapi_hsm_log_error(enum llapi_message_level level, int _rc,
355 const char *fmt, va_list args);
357 int llapi_get_agent_uuid(char *path, char *buf, size_t bufsize);
358 int llapi_create_volatile_idx(char *directory, int idx, int mode);
360 static inline int llapi_create_volatile(char *directory, int mode)
362 return llapi_create_volatile_idx(directory, -1, mode);
366 int llapi_fswap_layouts_grouplock(int fd1, int fd2, __u64 dv1, __u64 dv2,
367 int gid, __u64 flags);
368 int llapi_fswap_layouts(int fd1, int fd2, __u64 dv1, __u64 dv2, __u64 flags);
369 int llapi_swap_layouts(const char *path1, const char *path2, __u64 dv1,
370 __u64 dv2, __u64 flags);
372 /* Changelog interface. priv is private state, managed internally by these
375 /* Records received are in extended format now, though most of them are still
376 * written in disk in changelog_rec format (to save space and time), it's
377 * converted to extended format in the lustre api to ease changelog analysis. */
378 #define HAVE_CHANGELOG_EXTEND_REC 1
380 int llapi_changelog_start(void **priv, enum changelog_send_flag flags,
381 const char *mdtname, long long startrec);
382 int llapi_changelog_fini(void **priv);
383 int llapi_changelog_recv(void *priv, struct changelog_rec **rech);
384 int llapi_changelog_free(struct changelog_rec **rech);
385 int llapi_changelog_get_fd(void *priv);
386 /* Allow records up to endrec to be destroyed; requires registered id. */
387 int llapi_changelog_clear(const char *mdtname, const char *idstr,
390 /* HSM copytool interface.
391 * priv is private state, managed internally by these functions
393 struct hsm_copytool_private;
394 struct hsm_copyaction_private;
396 int llapi_hsm_copytool_register(struct hsm_copytool_private **priv,
397 const char *mnt, int archive_count,
398 int *archives, int rfd_flags);
399 int llapi_hsm_copytool_unregister(struct hsm_copytool_private **priv);
400 int llapi_hsm_copytool_get_fd(struct hsm_copytool_private *ct);
401 int llapi_hsm_copytool_recv(struct hsm_copytool_private *priv,
402 struct hsm_action_list **hal, int *msgsize);
403 int llapi_hsm_action_begin(struct hsm_copyaction_private **phcp,
404 const struct hsm_copytool_private *ct,
405 const struct hsm_action_item *hai,
406 int restore_mdt_index, int restore_open_flags,
408 int llapi_hsm_action_end(struct hsm_copyaction_private **phcp,
409 const struct hsm_extent *he, int hp_flags, int errval);
410 int llapi_hsm_action_progress(struct hsm_copyaction_private *hcp,
411 const struct hsm_extent *he, __u64 total,
413 int llapi_hsm_action_get_dfid(const struct hsm_copyaction_private *hcp,
415 int llapi_hsm_action_get_fd(const struct hsm_copyaction_private *hcp);
416 int llapi_hsm_import(const char *dst, int archive, const struct stat *st,
417 unsigned long long stripe_size, int stripe_offset,
418 int stripe_count, int stripe_pattern, char *pool_name,
421 /* HSM user interface */
422 struct hsm_user_request *llapi_hsm_user_request_alloc(int itemcount,
424 int llapi_hsm_request(const char *path, const struct hsm_user_request *request);
425 int llapi_hsm_current_action(const char *path, struct hsm_current_action *hca);
428 int llapi_json_init_list(struct llapi_json_item_list **item_list);
429 int llapi_json_destroy_list(struct llapi_json_item_list **item_list);
430 int llapi_json_add_item(struct llapi_json_item_list **item_list, char *key,
431 __u32 type, void *val);
432 int llapi_json_write_list(struct llapi_json_item_list **item_list, FILE *fp);
435 int llapi_lease_get(int fd, int mode);
436 int llapi_lease_check(int fd);
437 int llapi_lease_put(int fd);
440 int llapi_group_lock(int fd, int gid);
441 int llapi_group_unlock(int fd, int gid);
444 int llapi_ladvise(int fd, unsigned long long flags, int num_advise,
445 struct llapi_lu_ladvise *ladvise);
448 /* llapi_layout user interface */
450 /** Opaque data type abstracting the layout of a Lustre file. */
454 * Flags to control how layouts are retrieved.
457 /* Replace non-specified values with expected inherited values. */
458 #define LAYOUT_GET_EXPECTED 0x1
461 * Return a pointer to a newly-allocated opaque data structure containing
462 * the layout for the file at \a path. The pointer should be freed with
463 * llapi_layout_free() when it is no longer needed. Failure is indicated
464 * by a NULL return value and an appropriate error code stored in errno.
466 struct llapi_layout *llapi_layout_get_by_path(const char *path, uint32_t flags);
469 * Return a pointer to a newly-allocated opaque data type containing the
470 * layout for the file referenced by open file descriptor \a fd. The
471 * pointer should be freed with llapi_layout_free() when it is no longer
472 * needed. Failure is indicated by a NULL return value and an
473 * appropriate error code stored in errno.
475 struct llapi_layout *llapi_layout_get_by_fd(int fd, uint32_t flags);
478 * Return a pointer to a newly-allocated opaque data type containing the
479 * layout for the file associated with Lustre file identifier string
480 * \a fidstr. The string \a path must name a path within the
481 * filesystem that contains the file being looked up, such as the
482 * filesystem root. The returned pointer should be freed with
483 * llapi_layout_free() when it is no longer needed. Failure is
484 * indicated with a NULL return value and an appropriate error code
487 struct llapi_layout *llapi_layout_get_by_fid(const char *path,
488 const lustre_fid *fid,
492 * Allocate a new layout. Use this when creating a new file with
493 * llapi_layout_file_create().
495 struct llapi_layout *llapi_layout_alloc(void);
498 * Free memory allocated for \a layout.
500 void llapi_layout_free(struct llapi_layout *layout);
502 /** Not a valid stripe size, offset, or RAID pattern. */
503 #define LLAPI_LAYOUT_INVALID 0x1000000000000001ULL
506 * When specified or returned as the value for stripe count,
507 * stripe size, offset, or RAID pattern, the filesystem-wide
508 * default behavior will apply.
510 #define LLAPI_LAYOUT_DEFAULT (LLAPI_LAYOUT_INVALID + 1)
513 * When specified or returned as the value for stripe count, all
514 * available OSTs will be used.
516 #define LLAPI_LAYOUT_WIDE (LLAPI_LAYOUT_INVALID + 2)
519 * When specified as the value for layout pattern, file objects will be
520 * stored using RAID0. That is, data will be split evenly and without
521 * redundancy across all OSTs in the layout.
523 #define LLAPI_LAYOUT_RAID0 0
526 * The layout includes a specific set of OSTs on which to allocate.
528 #define LLAPI_LAYOUT_SPECIFIC 0x2000000000000000ULL
531 * A valid ost index should be less than maximum valid OST index (UINT_MAX).
533 #define LLAPI_LAYOUT_IDX_MAX 0x00000000FFFFFFFFULL
536 * Flags to modify how layouts are retrieved.
538 /******************** Stripe Count ********************/
541 * Store the stripe count of \a layout in \a count.
544 * \retval -1 Error with status code in errno.
546 int llapi_layout_stripe_count_get(const struct llapi_layout *layout,
550 * Set the stripe count of \a layout to \a count.
553 * \retval -1 Invalid argument, errno set to EINVAL.
555 int llapi_layout_stripe_count_set(struct llapi_layout *layout, uint64_t count);
557 /******************** Stripe Size ********************/
560 * Store the stripe size of \a layout in \a size.
563 * \retval -1 Invalid argument, errno set to EINVAL.
565 int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
569 * Set the stripe size of \a layout to \a stripe_size.
572 * \retval -1 Invalid argument, errno set to EINVAL.
574 int llapi_layout_stripe_size_set(struct llapi_layout *layout, uint64_t size);
576 /******************** Stripe Pattern ********************/
579 * Store the stripe pattern of \a layout in \a pattern.
582 * \retval -1 Error with status code in errno.
584 int llapi_layout_pattern_get(const struct llapi_layout *layout,
588 * Set the stripe pattern of \a layout to \a pattern.
591 * \retval -1 Invalid argument, errno set to EINVAL.
593 int llapi_layout_pattern_set(struct llapi_layout *layout, uint64_t pattern);
595 /******************** OST Index ********************/
598 * Store the index of the OST where stripe number \a stripe_number is stored
601 * An error return value will result from a NULL layout, if \a
602 * stripe_number is out of range, or if \a layout was not initialized
603 * with llapi_layout_lookup_by{path,fd,fid}().
606 * \retval -1 Invalid argument, errno set to EINVAL.
608 int llapi_layout_ost_index_get(const struct llapi_layout *layout,
609 uint64_t stripe_number, uint64_t *index);
612 * Set the OST index associated with stripe number \a stripe_number to
614 * NB: This is currently supported only for \a stripe_number = 0 and
615 * other usage will return ENOTSUPP in errno. A NULL \a layout or
616 * out-of-range \a stripe_number will return EINVAL in errno.
619 * \retval -1 Error with errno set to non-zero value.
621 int llapi_layout_ost_index_set(struct llapi_layout *layout, int stripe_number,
624 /******************** Pool Name ********************/
627 * Store up to \a pool_name_len characters of the name of the pool of
628 * OSTs associated with \a layout into the buffer pointed to by
631 * The correct calling form is:
633 * llapi_layout_pool_name_get(layout, pool_name, sizeof(pool_name));
635 * A pool defines a set of OSTs from which file objects may be
636 * allocated for a file using \a layout.
638 * On success, the number of bytes stored is returned, excluding the
639 * terminating '\0' character (zero indicates that \a layout does not
640 * have an associated OST pool). On error, -1 is returned and errno is
641 * set appropriately. Possible sources of error include a NULL pointer
642 * argument or insufficient space in \a dest to store the pool name,
643 * in which cases errno will be set to EINVAL.
645 * \retval 0+ The number of bytes stored in \a dest.
646 * \retval -1 Invalid argument, errno set to EINVAL.
648 int llapi_layout_pool_name_get(const struct llapi_layout *layout,
649 char *pool_name, size_t pool_name_len);
652 * Set the name of the pool of OSTs from which file objects will be
653 * allocated to \a pool_name.
655 * If the pool name uses "fsname.pool" notation to qualify the pool name
656 * with a filesystem name, the "fsname." portion will be silently
657 * discarded before storing the value. No validation that \a pool_name
658 * is an existing non-empty pool in filesystem \a fsname will be
659 * performed. Such validation can be performed by the application if
660 * desired using the llapi_search_ost() function. The maximum length of
661 * the stored value is defined by the constant LOV_MAXPOOLNAME.
664 * \retval -1 Invalid argument, errno set to EINVAL.
666 int llapi_layout_pool_name_set(struct llapi_layout *layout,
667 const char *pool_name);
669 /******************** File Creation ********************/
672 * Open an existing file at \a path, or create it with the specified
673 * \a layout and \a mode.
675 * One access mode and zero or more file creation flags and file status
676 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
677 * open file descriptor for the file. If \a layout is non-NULL and
678 * \a path is not on a Lustre filesystem this function will fail and set
681 * An already existing file may be opened with this function, but
682 * \a layout and \a mode will not be applied to it. Callers requiring a
683 * guarantee that the opened file is created with the specified
684 * \a layout and \a mode should use llapi_layout_file_create().
686 * A NULL \a layout may be specified, in which case the standard Lustre
687 * behavior for assigning layouts to newly-created files will apply.
689 * \retval 0+ An open file descriptor.
690 * \retval -1 Error with status code in errno.
692 int llapi_layout_file_open(const char *path, int open_flags, mode_t mode,
693 const struct llapi_layout *layout);
696 * Create a new file at \a path with the specified \a layout and \a mode.
698 * One access mode and zero or more file creation flags and file status
699 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
700 * open file descriptor for the file. If \a layout is non-NULL and
701 * \a path is not on a Lustre filesystem this function will fail and set
706 * llapi_layout_file_create(path, open_flags, mode, layout)
708 * shall be equivalent to:
710 * llapi_layout_file_open(path, open_flags|O_CREAT|O_EXCL, mode, layout)
712 * It is an error if \a path specifies an existing file.
714 * A NULL \a layout may be specified, in which the standard Lustre
715 * behavior for assigning layouts to newly-created files will apply.
717 * \retval 0+ An open file descriptor.
718 * \retval -1 Error with status code in errno.
720 int llapi_layout_file_create(const char *path, int open_flags, int mode,
721 const struct llapi_layout *layout);
724 * Fetch the start and end offset of the current layout component.
726 int llapi_layout_comp_extent_get(const struct llapi_layout *layout,
727 uint64_t *start, uint64_t *end);
729 * Set the extent of current layout component.
731 int llapi_layout_comp_extent_set(struct llapi_layout *layout,
732 uint64_t start, uint64_t end);
734 /* PFL component flags table */
735 static const struct comp_flag_name {
736 enum lov_comp_md_entry_flags cfn_flag;
737 const char *cfn_name;
738 } comp_flags_table[] = {
739 { LCME_FL_INIT, "init" },
740 /* For now, only "init" is supported
741 { LCME_FL_PRIMARY, "primary" },
742 { LCME_FL_STALE, "stale" },
743 { LCME_FL_OFFLINE, "offline" },
744 { LCME_FL_PREFERRED, "preferred" }
749 * Gets the attribute flags of the current component.
751 int llapi_layout_comp_flags_get(const struct llapi_layout *layout,
754 * Sets the specified flags of the current component leaving other flags as-is.
756 int llapi_layout_comp_flags_set(struct llapi_layout *layout, uint32_t flags);
758 * Clears the flags specified in the flags leaving other flags as-is.
760 int llapi_layout_comp_flags_clear(struct llapi_layout *layout, uint32_t flags);
762 * Fetches the file-unique component ID of the current layout component.
764 int llapi_layout_comp_id_get(const struct llapi_layout *layout, uint32_t *id);
766 * Adds one component to the existing composite or plain layout.
768 int llapi_layout_comp_add(struct llapi_layout *layout);
770 * Deletes the current layout component from the composite layout.
772 int llapi_layout_comp_del(struct llapi_layout *layout);
774 enum llapi_layout_comp_use {
775 LLAPI_LAYOUT_COMP_USE_FIRST = 1,
776 LLAPI_LAYOUT_COMP_USE_LAST = 2,
777 LLAPI_LAYOUT_COMP_USE_NEXT = 3,
778 LLAPI_LAYOUT_COMP_USE_PREV = 4,
782 * Set the currently active component to the specified component ID.
784 int llapi_layout_comp_use_id(struct llapi_layout *layout, uint32_t id);
786 * Select the currently active component at the specified position.
788 int llapi_layout_comp_use(struct llapi_layout *layout, uint32_t pos);
790 * Add layout components to an existing file.
792 int llapi_layout_file_comp_add(const char *path,
793 const struct llapi_layout *layout);
795 * Delete component(s) by the specified component id or flags.
797 int llapi_layout_file_comp_del(const char *path, uint32_t id, uint32_t flags);
799 * Change flags or other parameters of the component(s) by component ID of an
800 * existing file. The component to be modified is specified by the
801 * comp->lcme_id value, which must be an unique component ID. The new
802 * attributes are passed in by @comp and @valid is used to specify which
803 * attributes in the component are going to be changed.
805 int llapi_layout_file_comp_set(const char *path,
806 const struct llapi_layout *comp,
809 * Check if the file layout is composite.
811 bool llapi_layout_is_composite(struct llapi_layout *layout);