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 <lustre/lustre_user.h>
46 #define LL_MAXQUOTAS 3
49 extern bool liblustreapi_initialized;
52 typedef void (*llapi_cb_t)(char *obd_type_name, char *obd_name, char *obd_uuid,
55 /* lustreapi message severity level */
56 enum llapi_message_level {
67 typedef void (*llapi_log_callback_t)(enum llapi_message_level level, int err,
68 const char *fmt, va_list ap);
71 /* the bottom three bits reserved for llapi_message_level */
72 #define LLAPI_MSG_MASK 0x00000007
73 #define LLAPI_MSG_NO_ERRNO 0x00000010
75 static inline const char *llapi_msg_level2str(enum llapi_message_level level)
77 static const char *levels[LLAPI_MSG_MAX] = {"OFF", "FATAL", "ERROR",
81 if (level >= LLAPI_MSG_MAX)
86 extern void llapi_msg_set_level(int level);
87 int llapi_msg_get_level(void);
88 extern llapi_log_callback_t llapi_error_callback_set(llapi_log_callback_t cb);
89 extern llapi_log_callback_t llapi_info_callback_set(llapi_log_callback_t cb);
91 void llapi_error(enum llapi_message_level level, int err, const char *fmt, ...)
92 __attribute__((__format__(__printf__, 3, 4)));
93 #define llapi_err_noerrno(level, fmt, a...) \
94 llapi_error((level) | LLAPI_MSG_NO_ERRNO, 0, fmt, ## a)
95 void llapi_printf(enum llapi_message_level level, const char *fmt, ...)
96 __attribute__((__format__(__printf__, 2, 3)));
98 struct llapi_stripe_param {
99 unsigned long long lsp_stripe_size;
101 int lsp_stripe_offset;
102 int lsp_stripe_pattern;
103 /* Number of stripes. Size of lsp_osts[] if lsp_specific is true.*/
104 int lsp_stripe_count;
105 bool lsp_is_specific;
109 extern int llapi_file_open_param(const char *name, int flags, mode_t mode,
110 const struct llapi_stripe_param *param);
111 extern int llapi_file_create(const char *name, unsigned long long stripe_size,
112 int stripe_offset, int stripe_count,
114 extern int llapi_file_open(const char *name, int flags, int mode,
115 unsigned long long stripe_size, int stripe_offset,
116 int stripe_count, int stripe_pattern);
117 extern int llapi_file_create_pool(const char *name,
118 unsigned long long stripe_size,
119 int stripe_offset, int stripe_count,
120 int stripe_pattern, char *pool_name);
121 extern int llapi_file_open_pool(const char *name, int flags, int mode,
122 unsigned long long stripe_size,
123 int stripe_offset, int stripe_count,
124 int stripe_pattern, char *pool_name);
125 extern int llapi_poollist(const char *name);
126 extern int llapi_get_poollist(const char *name, char **poollist, int list_size,
127 char *buffer, int buffer_size);
128 extern int llapi_get_poolmembers(const char *poolname, char **members,
129 int list_size, char *buffer, int buffer_size);
130 extern int llapi_file_get_stripe(const char *path, struct lov_user_md *lum);
131 extern int llapi_file_lookup(int dirfd, const char *name);
133 #define VERBOSE_COUNT 0x1
134 #define VERBOSE_SIZE 0x2
135 #define VERBOSE_OFFSET 0x4
136 #define VERBOSE_POOL 0x8
137 #define VERBOSE_DETAIL 0x10
138 #define VERBOSE_OBJID 0x20
139 #define VERBOSE_GENERATION 0x40
140 #define VERBOSE_MDTINDEX 0x80
141 #define VERBOSE_LAYOUT 0x100
142 #define VERBOSE_COMP_COUNT 0x200
143 #define VERBOSE_COMP_FLAGS 0x400
144 #define VERBOSE_COMP_START 0x800
145 #define VERBOSE_COMP_END 0x1000
146 #define VERBOSE_COMP_ID 0x2000
147 #define VERBOSE_DFID 0x4000
148 #define VERBOSE_HASH_TYPE 0x8000
149 #define VERBOSE_DEFAULT (VERBOSE_COUNT | VERBOSE_SIZE | \
150 VERBOSE_OFFSET | VERBOSE_POOL | \
151 VERBOSE_OBJID | VERBOSE_GENERATION | \
152 VERBOSE_LAYOUT | VERBOSE_HASH_TYPE | \
153 VERBOSE_COMP_COUNT | VERBOSE_COMP_FLAGS | \
154 VERBOSE_COMP_START | VERBOSE_COMP_END | \
158 unsigned int fp_max_depth;
160 mode_t fp_type; /* S_IFIFO,... */
166 /* {a,m,c}sign cannot be bitfields due to using pointers to
167 * access them during argument parsing. */
171 /* these need to be signed values */
173 fp_stripe_size_sign:2,
174 fp_stripe_count_sign:2,
175 fp_comp_start_sign:2,
177 fp_comp_count_sign:2,
179 unsigned long long fp_size;
180 unsigned long long fp_size_units;
182 unsigned long long fp_zero_end:1,
184 fp_exclude_pattern:1,
192 fp_check_pool:1, /* LOV pool name */
193 fp_check_size:1, /* file size */
199 fp_get_lmv:1, /* get MDT list from LMV */
200 fp_raw:1, /* do not fill in defaults */
201 fp_check_stripe_size:1, /* LOV stripe size */
202 fp_exclude_stripe_size:1,
203 fp_check_stripe_count:1, /* LOV stripe count */
204 fp_exclude_stripe_count:1,
207 fp_get_default_lmv:1, /* Get default LMV */
209 fp_check_comp_count:1,
210 fp_exclude_comp_count:1,
211 fp_check_comp_flags:1,
212 fp_exclude_comp_flags:1,
213 fp_check_comp_start:1,
214 fp_exclude_comp_start:1,
216 fp_exclude_comp_end:1,
218 fp_exclude_comp_id:1,
219 fp_check_mdt_count:1,
220 fp_exclude_mdt_count:1,
221 fp_check_hash_type:1,
222 fp_exclude_hash_type:1;
227 /* regular expression */
230 struct obd_uuid *fp_obd_uuid;
232 int fp_num_alloc_obds;
236 struct obd_uuid *fp_mdt_uuid;
238 int fp_num_alloc_mdts;
241 int fp_file_mdt_index;
244 struct lov_user_mds_data *fp_lmd;
246 char fp_poolname[LOV_MAXPOOLNAME + 1];
248 __u32 fp_lmv_stripe_count;
249 struct lmv_user_md *fp_lmv_md;
251 unsigned long long fp_stripe_size;
252 unsigned long long fp_stripe_size_units;
253 unsigned long long fp_stripe_count;
259 unsigned long long fp_comp_start;
260 unsigned long long fp_comp_start_units;
261 unsigned long long fp_comp_end;
262 unsigned long long fp_comp_end_units;
263 unsigned long long fp_mdt_count;
265 /* In-process parameters. */
266 unsigned long fp_got_uuids:1,
268 unsigned int fp_depth;
269 unsigned int fp_hash_type;
272 extern int llapi_ostlist(char *path, struct find_param *param);
273 extern int llapi_uuid_match(char *real_uuid, char *search_uuid);
274 extern int llapi_getstripe(char *path, struct find_param *param);
275 extern int llapi_find(char *path, struct find_param *param);
277 extern int llapi_file_fget_mdtidx(int fd, int *mdtidx);
278 extern int llapi_dir_set_default_lmv_stripe(const char *name, int stripe_offset,
279 int stripe_count, int stripe_pattern,
280 const char *pool_name);
281 extern int llapi_dir_create_pool(const char *name, int flags, int stripe_offset,
282 int stripe_count, int stripe_pattern,
283 const char *poolname);
284 int llapi_direntry_remove(char *dname);
286 int llapi_obd_fstatfs(int fd, __u32 type, __u32 index,
287 struct obd_statfs *stat_buf, struct obd_uuid *uuid_buf);
288 extern int llapi_obd_statfs(char *path, __u32 type, __u32 index,
289 struct obd_statfs *stat_buf,
290 struct obd_uuid *uuid_buf);
291 extern int llapi_ping(char *obd_type, char *obd_name);
292 extern int llapi_target_check(int num_types, char **obd_types, char *dir);
293 extern int llapi_file_get_lov_uuid(const char *path, struct obd_uuid *lov_uuid);
294 extern int llapi_file_get_lmv_uuid(const char *path, struct obd_uuid *lmv_uuid);
295 extern int llapi_file_fget_lov_uuid(int fd, struct obd_uuid *lov_uuid);
296 extern int llapi_lov_get_uuids(int fd, struct obd_uuid *uuidp, int *ost_count);
297 extern int llapi_lmv_get_uuids(int fd, struct obd_uuid *uuidp, int *mdt_count);
298 extern int llapi_is_lustre_mnttype(const char *type);
299 extern int llapi_search_ost(char *fsname, char *poolname, char *ostname);
300 extern int llapi_get_obd_count(char *mnt, int *count, int is_mdt);
301 extern int llapi_parse_size(const char *optarg, unsigned long long *size,
302 unsigned long long *size_units, int bytes_spec);
303 extern int llapi_search_mounts(const char *pathname, int index,
304 char *mntdir, char *fsname);
305 extern int llapi_search_fsname(const char *pathname, char *fsname);
306 extern int llapi_getname(const char *path, char *buf, size_t size);
307 extern int llapi_search_fileset(const char *pathname, char *fileset);
309 extern int llapi_search_rootpath(char *pathname, const char *fsname);
310 extern int llapi_nodemap_exists(const char *name);
311 extern int llapi_migrate_mdt(char *path, struct find_param *param);
312 extern int llapi_mv(char *path, struct find_param *param);
315 #define HAVE_LLAPI_IS_LUSTRE_MNT
316 extern int llapi_is_lustre_mnt(struct mntent *mnt);
317 extern int llapi_quotactl(char *mnt, struct if_quotactl *qctl);
318 extern int llapi_target_iterate(int type_num, char **obd_type, void *args,
320 extern int llapi_get_connect_flags(const char *mnt, __u64 *flags);
321 extern int llapi_cp(int argc, char *argv[]);
322 extern int llapi_ls(int argc, char *argv[]);
323 extern int llapi_fid2path(const char *device, const char *fidstr, char *path,
324 int pathlen, long long *recno, int *linkno);
325 extern int llapi_path2fid(const char *path, lustre_fid *fid);
326 extern int llapi_get_mdt_index_by_fid(int fd, const lustre_fid *fid,
328 extern int llapi_fd2fid(const int fd, lustre_fid *fid);
329 /* get FID of parent dir + the related name of entry in this parent dir */
330 extern int llapi_path2parent(const char *path, unsigned int linkno,
331 lustre_fid *parent_fid, char *name,
333 extern int llapi_fd2parent(int fd, unsigned int linkno,
334 lustre_fid *parent_fid, char *name,
336 extern int llapi_chomp_string(char *buf);
337 extern int llapi_open_by_fid(const char *dir, const lustre_fid *fid,
340 extern int llapi_get_version_string(char *version, unsigned int version_size);
341 /* llapi_get_version() is deprecated, use llapi_get_version_string() instead */
342 extern int llapi_get_version(char *buffer, int buffer_size, char **version)
343 __attribute__((deprecated));
344 extern int llapi_get_data_version(int fd, __u64 *data_version, __u64 flags);
345 extern int llapi_hsm_state_get_fd(int fd, struct hsm_user_state *hus);
346 extern int llapi_hsm_state_get(const char *path, struct hsm_user_state *hus);
347 extern int llapi_hsm_state_set_fd(int fd, __u64 setmask, __u64 clearmask,
349 extern int llapi_hsm_state_set(const char *path, __u64 setmask, __u64 clearmask,
351 extern int llapi_hsm_register_event_fifo(const char *path);
352 extern int llapi_hsm_unregister_event_fifo(const char *path);
353 extern void llapi_hsm_log_error(enum llapi_message_level level, int _rc,
354 const char *fmt, va_list args);
356 extern int llapi_get_agent_uuid(char *path, char *buf, size_t bufsize);
357 extern int llapi_create_volatile_idx(char *directory, int idx, int mode);
358 static inline int llapi_create_volatile(char *directory, int mode)
360 return llapi_create_volatile_idx(directory, -1, mode);
364 extern int llapi_fswap_layouts_grouplock(int fd1, int fd2, __u64 dv1, __u64 dv2,
365 int gid, __u64 flags);
366 extern int llapi_fswap_layouts(int fd1, int fd2, __u64 dv1, __u64 dv2,
368 extern int llapi_swap_layouts(const char *path1, const char *path2,
369 __u64 dv1, __u64 dv2, __u64 flags);
371 /* Changelog interface. priv is private state, managed internally by these
374 /* Records received are in extended format now, though most of them are still
375 * written in disk in changelog_rec format (to save space and time), it's
376 * converted to extended format in the lustre api to ease changelog analysis. */
377 #define HAVE_CHANGELOG_EXTEND_REC 1
379 extern int llapi_changelog_start(void **priv, enum changelog_send_flag flags,
380 const char *mdtname, long long startrec);
381 extern int llapi_changelog_fini(void **priv);
382 extern int llapi_changelog_recv(void *priv, struct changelog_rec **rech);
383 extern int llapi_changelog_free(struct changelog_rec **rech);
384 extern int llapi_changelog_get_fd(void *priv);
385 /* Allow records up to endrec to be destroyed; requires registered id. */
386 extern int llapi_changelog_clear(const char *mdtname, const char *idstr,
389 /* HSM copytool interface.
390 * priv is private state, managed internally by these functions
392 struct hsm_copytool_private;
393 struct hsm_copyaction_private;
395 extern int llapi_hsm_copytool_register(struct hsm_copytool_private **priv,
396 const char *mnt, int archive_count,
397 int *archives, int rfd_flags);
398 extern int llapi_hsm_copytool_unregister(struct hsm_copytool_private **priv);
399 extern int llapi_hsm_copytool_get_fd(struct hsm_copytool_private *ct);
400 extern int llapi_hsm_copytool_recv(struct hsm_copytool_private *priv,
401 struct hsm_action_list **hal, int *msgsize);
402 extern int llapi_hsm_action_begin(struct hsm_copyaction_private **phcp,
403 const struct hsm_copytool_private *ct,
404 const struct hsm_action_item *hai,
405 int restore_mdt_index, int restore_open_flags,
407 extern int llapi_hsm_action_end(struct hsm_copyaction_private **phcp,
408 const struct hsm_extent *he,
409 int hp_flags, int errval);
410 extern int llapi_hsm_action_progress(struct hsm_copyaction_private *hcp,
411 const struct hsm_extent *he, __u64 total,
413 extern int llapi_hsm_action_get_dfid(const struct hsm_copyaction_private *hcp,
415 extern int llapi_hsm_action_get_fd(const struct hsm_copyaction_private *hcp);
416 extern 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,
419 char *pool_name, lustre_fid *newfid);
421 /* HSM user interface */
422 extern struct hsm_user_request *llapi_hsm_user_request_alloc(int itemcount,
424 extern int llapi_hsm_request(const char *path,
425 const struct hsm_user_request *request);
426 extern int llapi_hsm_current_action(const char *path,
427 struct hsm_current_action *hca);
430 extern int llapi_json_init_list(struct llapi_json_item_list **item_list);
431 extern int llapi_json_destroy_list(struct llapi_json_item_list **item_list);
432 extern int llapi_json_add_item(struct llapi_json_item_list **item_list,
433 char *key, __u32 type, void *val);
434 extern int llapi_json_write_list(struct llapi_json_item_list **item_list,
438 extern int llapi_lease_get(int fd, int mode);
439 extern int llapi_lease_check(int fd);
440 extern int llapi_lease_put(int fd);
443 int llapi_group_lock(int fd, int gid);
444 int llapi_group_unlock(int fd, int gid);
447 int llapi_ladvise(int fd, unsigned long long flags, int num_advise,
448 struct llapi_lu_ladvise *ladvise);
451 /* llapi_layout user interface */
453 /** Opaque data type abstracting the layout of a Lustre file. */
457 * Flags to control how layouts are retrieved.
460 /* Replace non-specified values with expected inherited values. */
461 #define LAYOUT_GET_EXPECTED 0x1
464 * Return a pointer to a newly-allocated opaque data structure containing
465 * the layout for the file at \a path. The pointer should be freed with
466 * llapi_layout_free() when it is no longer needed. Failure is indicated
467 * by a NULL return value and an appropriate error code stored in errno.
469 struct llapi_layout *llapi_layout_get_by_path(const char *path, uint32_t flags);
472 * Return a pointer to a newly-allocated opaque data type containing the
473 * layout for the file referenced by open file descriptor \a fd. The
474 * pointer should be freed with llapi_layout_free() when it is no longer
475 * needed. Failure is indicated by a NULL return value and an
476 * appropriate error code stored in errno.
478 struct llapi_layout *llapi_layout_get_by_fd(int fd, uint32_t flags);
481 * Return a pointer to a newly-allocated opaque data type containing the
482 * layout for the file associated with Lustre file identifier string
483 * \a fidstr. The string \a path must name a path within the
484 * filesystem that contains the file being looked up, such as the
485 * filesystem root. The returned pointer should be freed with
486 * llapi_layout_free() when it is no longer needed. Failure is
487 * indicated with a NULL return value and an appropriate error code
490 struct llapi_layout *llapi_layout_get_by_fid(const char *path,
491 const lustre_fid *fid,
495 * Allocate a new layout. Use this when creating a new file with
496 * llapi_layout_file_create().
498 struct llapi_layout *llapi_layout_alloc(void);
501 * Free memory allocated for \a layout.
503 void llapi_layout_free(struct llapi_layout *layout);
505 /** Not a valid stripe size, offset, or RAID pattern. */
506 #define LLAPI_LAYOUT_INVALID 0x1000000000000001ULL
509 * When specified or returned as the value for stripe count,
510 * stripe size, offset, or RAID pattern, the filesystem-wide
511 * default behavior will apply.
513 #define LLAPI_LAYOUT_DEFAULT (LLAPI_LAYOUT_INVALID + 1)
516 * When specified or returned as the value for stripe count, all
517 * available OSTs will be used.
519 #define LLAPI_LAYOUT_WIDE (LLAPI_LAYOUT_INVALID + 2)
522 * When specified as the value for layout pattern, file objects will be
523 * stored using RAID0. That is, data will be split evenly and without
524 * redundancy across all OSTs in the layout.
526 #define LLAPI_LAYOUT_RAID0 0
529 * The layout includes a specific set of OSTs on which to allocate.
531 #define LLAPI_LAYOUT_SPECIFIC 0x2000000000000000ULL
534 * A valid ost index should be less than maximum valid OST index (UINT_MAX).
536 #define LLAPI_LAYOUT_IDX_MAX 0x00000000FFFFFFFFULL
539 * Flags to modify how layouts are retrieved.
541 /******************** Stripe Count ********************/
544 * Store the stripe count of \a layout in \a count.
547 * \retval -1 Error with status code in errno.
549 int llapi_layout_stripe_count_get(const struct llapi_layout *layout,
553 * Set the stripe count of \a layout to \a count.
556 * \retval -1 Invalid argument, errno set to EINVAL.
558 int llapi_layout_stripe_count_set(struct llapi_layout *layout, uint64_t count);
560 /******************** Stripe Size ********************/
563 * Store the stripe size of \a layout in \a size.
566 * \retval -1 Invalid argument, errno set to EINVAL.
568 int llapi_layout_stripe_size_get(const struct llapi_layout *layout,
572 * Set the stripe size of \a layout to \a stripe_size.
575 * \retval -1 Invalid argument, errno set to EINVAL.
577 int llapi_layout_stripe_size_set(struct llapi_layout *layout, uint64_t size);
579 /******************** Stripe Pattern ********************/
582 * Store the stripe pattern of \a layout in \a pattern.
585 * \retval -1 Error with status code in errno.
587 int llapi_layout_pattern_get(const struct llapi_layout *layout,
591 * Set the stripe pattern of \a layout to \a pattern.
594 * \retval -1 Invalid argument, errno set to EINVAL.
596 int llapi_layout_pattern_set(struct llapi_layout *layout, uint64_t pattern);
598 /******************** OST Index ********************/
601 * Store the index of the OST where stripe number \a stripe_number is stored
604 * An error return value will result from a NULL layout, if \a
605 * stripe_number is out of range, or if \a layout was not initialized
606 * with llapi_layout_lookup_by{path,fd,fid}().
609 * \retval -1 Invalid argument, errno set to EINVAL.
611 int llapi_layout_ost_index_get(const struct llapi_layout *layout,
612 uint64_t stripe_number, uint64_t *index);
615 * Set the OST index associated with stripe number \a stripe_number to
617 * NB: This is currently supported only for \a stripe_number = 0 and
618 * other usage will return ENOTSUPP in errno. A NULL \a layout or
619 * out-of-range \a stripe_number will return EINVAL in errno.
622 * \retval -1 Error with errno set to non-zero value.
624 int llapi_layout_ost_index_set(struct llapi_layout *layout, int stripe_number,
627 /******************** Pool Name ********************/
630 * Store up to \a pool_name_len characters of the name of the pool of
631 * OSTs associated with \a layout into the buffer pointed to by
634 * The correct calling form is:
636 * llapi_layout_pool_name_get(layout, pool_name, sizeof(pool_name));
638 * A pool defines a set of OSTs from which file objects may be
639 * allocated for a file using \a layout.
641 * On success, the number of bytes stored is returned, excluding the
642 * terminating '\0' character (zero indicates that \a layout does not
643 * have an associated OST pool). On error, -1 is returned and errno is
644 * set appropriately. Possible sources of error include a NULL pointer
645 * argument or insufficient space in \a dest to store the pool name,
646 * in which cases errno will be set to EINVAL.
648 * \retval 0+ The number of bytes stored in \a dest.
649 * \retval -1 Invalid argument, errno set to EINVAL.
651 int llapi_layout_pool_name_get(const struct llapi_layout *layout,
652 char *pool_name, size_t pool_name_len);
655 * Set the name of the pool of OSTs from which file objects will be
656 * allocated to \a pool_name.
658 * If the pool name uses "fsname.pool" notation to qualify the pool name
659 * with a filesystem name, the "fsname." portion will be silently
660 * discarded before storing the value. No validation that \a pool_name
661 * is an existing non-empty pool in filesystem \a fsname will be
662 * performed. Such validation can be performed by the application if
663 * desired using the llapi_search_ost() function. The maximum length of
664 * the stored value is defined by the constant LOV_MAXPOOLNAME.
667 * \retval -1 Invalid argument, errno set to EINVAL.
669 int llapi_layout_pool_name_set(struct llapi_layout *layout,
670 const char *pool_name);
672 /******************** File Creation ********************/
675 * Open an existing file at \a path, or create it with the specified
676 * \a layout and \a mode.
678 * One access mode and zero or more file creation flags and file status
679 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
680 * open file descriptor for the file. If \a layout is non-NULL and
681 * \a path is not on a Lustre filesystem this function will fail and set
684 * An already existing file may be opened with this function, but
685 * \a layout and \a mode will not be applied to it. Callers requiring a
686 * guarantee that the opened file is created with the specified
687 * \a layout and \a mode should use llapi_layout_file_create().
689 * A NULL \a layout may be specified, in which case the standard Lustre
690 * behavior for assigning layouts to newly-created files will apply.
692 * \retval 0+ An open file descriptor.
693 * \retval -1 Error with status code in errno.
695 int llapi_layout_file_open(const char *path, int open_flags, mode_t mode,
696 const struct llapi_layout *layout);
699 * Create a new file at \a path with the specified \a layout and \a mode.
701 * One access mode and zero or more file creation flags and file status
702 * flags May be bitwise-or'd in \a open_flags (see open(2)). Return an
703 * open file descriptor for the file. If \a layout is non-NULL and
704 * \a path is not on a Lustre filesystem this function will fail and set
709 * llapi_layout_file_create(path, open_flags, mode, layout)
711 * shall be equivalent to:
713 * llapi_layout_file_open(path, open_flags|O_CREAT|O_EXCL, mode, layout)
715 * It is an error if \a path specifies an existing file.
717 * A NULL \a layout may be specified, in which the standard Lustre
718 * behavior for assigning layouts to newly-created files will apply.
720 * \retval 0+ An open file descriptor.
721 * \retval -1 Error with status code in errno.
723 int llapi_layout_file_create(const char *path, int open_flags, int mode,
724 const struct llapi_layout *layout);
727 * Fetch the start and end offset of the current layout component.
729 int llapi_layout_comp_extent_get(const struct llapi_layout *layout,
730 uint64_t *start, uint64_t *end);
732 * Set the extent of current layout component.
734 int llapi_layout_comp_extent_set(struct llapi_layout *layout,
735 uint64_t start, uint64_t end);
737 * Gets the attribute flags of the current component.
739 int llapi_layout_comp_flags_get(const struct llapi_layout *layout,
742 * Sets the specified flags of the current component leaving other flags as-is.
744 int llapi_layout_comp_flags_set(struct llapi_layout *layout, uint32_t flags);
746 * Clears the flags specified in the flags leaving other flags as-is.
748 int llapi_layout_comp_flags_clear(struct llapi_layout *layout, uint32_t flags);
750 * Fetches the file-unique component ID of the current layout component.
752 int llapi_layout_comp_id_get(const struct llapi_layout *layout, uint32_t *id);
754 * Adds one component to the existing composite or plain layout.
756 int llapi_layout_comp_add(struct llapi_layout *layout);
758 * Deletes the current layout component from the composite layout.
760 int llapi_layout_comp_del(struct llapi_layout *layout);
763 LLAPI_LAYOUT_COMP_POS_NEXT = 0,
764 LLAPI_LAYOUT_COMP_POS_FIRST = 1,
765 LLAPI_LAYOUT_COMP_POS_LAST = 2
769 * Move the current component pointer by specified component ID.
771 int llapi_layout_comp_move_at(struct llapi_layout *layout, uint32_t id);
773 * Move the current component pointer to a specified position.
775 int llapi_layout_comp_move(struct llapi_layout *layout, uint32_t pos);
777 * Add layout components to an existing file.
779 int llapi_layout_file_comp_add(const char *path,
780 const struct llapi_layout *layout);
782 * Delete component(s) by the specified component id (accepting lcme_id
783 * wildcards also) from an existing file.
785 int llapi_layout_file_comp_del(const char *path, uint32_t id);
787 * Change flags or other parameters of the component(s) by component ID of an
788 * existing file. The component to be modified is specified by the
789 * comp->lcme_id value, which must be an unique component ID. The new
790 * attributes are passed in by @comp and @valid is used to specify which
791 * attributes in the component are going to be changed.
793 int llapi_layout_file_comp_set(const char *path,
794 const struct llapi_layout *comp,