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LU-14472 quota: skip non-exist or inact tgt for lfs_quota
[fs/lustre-release.git] / lustre / utils / lfs.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
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.
9  *
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).
15  *
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
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2011, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  *
31  * lustre/utils/lfs.c
32  *
33  * Author: Peter J. Braam <braam@clusterfs.com>
34  * Author: Phil Schwan <phil@clusterfs.com>
35  * Author: Robert Read <rread@clusterfs.com>
36  */
37
38 /* for O_DIRECTORY */
39 #ifndef _GNU_SOURCE
40 #define _GNU_SOURCE
41 #endif
42
43 #include <stdlib.h>
44 #include <stdio.h>
45 #include <inttypes.h>
46 #include <getopt.h>
47 #include <string.h>
48 #include <mntent.h>
49 #include <unistd.h>
50 #include <errno.h>
51 #include <err.h>
52 #include <pwd.h>
53 #include <grp.h>
54 #include <sys/ioctl.h>
55 #include <sys/quota.h>
56 #include <sys/time.h>
57 #include <sys/types.h>
58 #include <sys/stat.h>
59 #include <sys/param.h>
60 #include <sys/xattr.h>
61 #include <fcntl.h>
62 #include <dirent.h>
63 #include <time.h>
64 #include <ctype.h>
65 #include <zlib.h>
66 #include <libgen.h>
67 #include <asm/byteorder.h>
68 #include "lfs_project.h"
69
70 #include <libcfs/util/string.h>
71 #include <libcfs/util/ioctl.h>
72 #include <libcfs/util/parser.h>
73 #include <libcfs/util/string.h>
74 #include <lustre/lustreapi.h>
75 #include <linux/lustre/lustre_ver.h>
76 #include <linux/lustre/lustre_param.h>
77 #include <linux/lnet/nidstr.h>
78 #include <lnetconfig/cyaml.h>
79 #include "lstddef.h"
80
81 /* all functions */
82 static int lfs_find(int argc, char **argv);
83 static int lfs_getstripe(int argc, char **argv);
84 static int lfs_getdirstripe(int argc, char **argv);
85 static int lfs_setdirstripe(int argc, char **argv);
86 static int lfs_rmentry(int argc, char **argv);
87 static int lfs_unlink_foreign(int argc, char **argv);
88 static int lfs_osts(int argc, char **argv);
89 static int lfs_mdts(int argc, char **argv);
90 static int lfs_df(int argc, char **argv);
91 static int lfs_getname(int argc, char **argv);
92 static int lfs_check(int argc, char **argv);
93 #ifdef HAVE_SYS_QUOTA_H
94 static int lfs_setquota(int argc, char **argv);
95 static int lfs_quota(int argc, char **argv);
96 static int lfs_project(int argc, char **argv);
97 #endif
98 static int lfs_flushctx(int argc, char **argv);
99 static int lfs_poollist(int argc, char **argv);
100 static int lfs_changelog(int argc, char **argv);
101 static int lfs_changelog_clear(int argc, char **argv);
102 static int lfs_fid2path(int argc, char **argv);
103 static int lfs_path2fid(int argc, char **argv);
104 static int lfs_rmfid(int argc, char **argv);
105 static int lfs_data_version(int argc, char **argv);
106 static int lfs_hsm_state(int argc, char **argv);
107 static int lfs_hsm_set(int argc, char **argv);
108 static int lfs_hsm_clear(int argc, char **argv);
109 static int lfs_hsm_action(int argc, char **argv);
110 static int lfs_hsm_archive(int argc, char **argv);
111 static int lfs_hsm_restore(int argc, char **argv);
112 static int lfs_hsm_release(int argc, char **argv);
113 static int lfs_hsm_remove(int argc, char **argv);
114 static int lfs_hsm_cancel(int argc, char **argv);
115 static int lfs_swap_layouts(int argc, char **argv);
116 static int lfs_mv(int argc, char **argv);
117 static int lfs_ladvise(int argc, char **argv);
118 static int lfs_getsom(int argc, char **argv);
119 static int lfs_heat_get(int argc, char **argv);
120 static int lfs_heat_set(int argc, char **argv);
121 static int lfs_mirror(int argc, char **argv);
122 static int lfs_mirror_list_commands(int argc, char **argv);
123 static int lfs_list_commands(int argc, char **argv);
124 static inline int lfs_mirror_resync(int argc, char **argv);
125 static inline int lfs_mirror_verify(int argc, char **argv);
126 static inline int lfs_mirror_read(int argc, char **argv);
127 static inline int lfs_mirror_write(int argc, char **argv);
128 static inline int lfs_mirror_copy(int argc, char **argv);
129 static int lfs_pcc_attach(int argc, char **argv);
130 static int lfs_pcc_attach_fid(int argc, char **argv);
131 static int lfs_pcc_detach(int argc, char **argv);
132 static int lfs_pcc_detach_fid(int argc, char **argv);
133 static int lfs_pcc_state(int argc, char **argv);
134 static int lfs_pcc(int argc, char **argv);
135 static int lfs_pcc_list_commands(int argc, char **argv);
136 static int lfs_migrate_to_dom(int fd, int fdv, char *name,
137                               __u64 migration_flags);
138
139 struct pool_to_id_cbdata {
140         const char *pool;
141         __u32 id;
142 };
143 static int find_comp_id_by_pool(struct llapi_layout *layout, void *cbdata);
144 static int find_mirror_id_by_pool(struct llapi_layout *layout, void *cbdata);
145
146 enum setstripe_origin {
147         SO_SETSTRIPE,
148         SO_MIGRATE,
149         SO_MIGRATE_MDT,
150         SO_MIRROR_CREATE,
151         SO_MIRROR_EXTEND,
152         SO_MIRROR_SPLIT,
153         SO_MIRROR_DELETE,
154 };
155
156 static int lfs_setstripe_internal(int argc, char **argv,
157                                   enum setstripe_origin opc);
158
159 static inline int lfs_setstripe(int argc, char **argv)
160 {
161         return lfs_setstripe_internal(argc, argv, SO_SETSTRIPE);
162 }
163
164 static inline int lfs_setstripe_migrate(int argc, char **argv)
165 {
166         return lfs_setstripe_internal(argc, argv, SO_MIGRATE);
167 }
168
169 static inline int lfs_mirror_create(int argc, char **argv)
170 {
171         return lfs_setstripe_internal(argc, argv, SO_MIRROR_CREATE);
172 }
173
174 static inline int lfs_mirror_extend(int argc, char **argv)
175 {
176         return lfs_setstripe_internal(argc, argv, SO_MIRROR_EXTEND);
177 }
178
179 static inline int lfs_mirror_split(int argc, char **argv)
180 {
181         return lfs_setstripe_internal(argc, argv, SO_MIRROR_SPLIT);
182 }
183
184 static inline int lfs_mirror_delete(int argc, char **argv)
185 {
186         return lfs_setstripe_internal(argc, argv, SO_MIRROR_DELETE);
187 }
188
189 /* Setstripe and migrate share mostly the same parameters */
190 #define SSM_CMD_COMMON(cmd) \
191         "usage: "cmd" [--component-end|-E COMP_END]\n"                  \
192         "                 [--copy=LUSTRE_SRC]\n"                        \
193         "                 [--extension-size|--ext-size|-z SIZE]\n"      \
194         "                 [--help|-h] [--layout|-L PATTERN]\n"          \
195         "                 [--layout|-L PATTERN]\n"                      \
196         "                 [--mirror-count|-N[MIRROR_COUNT]]\n"          \
197         "                 [--ost|-o OST_INDICES]\n"                     \
198         "                 [--overstripe-count|-C STRIPE_COUNT]\n"       \
199         "                 [--pool|-p POOL_NAME]\n"                      \
200         "                 [--stripe-count|-c STRIPE_COUNT]\n"           \
201         "                 [--stripe-index|-i START_OST_IDX]\n"          \
202         "                 [--stripe-size|-S STRIPE_SIZE]\n"             \
203         "                 [--yaml|-y YAML_TEMPLATE_FILE]\n"
204
205 #define MIRROR_EXTEND_USAGE                                             \
206         "                 {--mirror-count|-N[MIRROR_COUNT]}\n"          \
207         "                 [SETSTRIPE_OPTIONS|-f|--file VICTIM_FILE]\n"  \
208         "                 [--no-verify]\n"
209
210 #define SETSTRIPE_USAGE                                                 \
211         SSM_CMD_COMMON("setstripe")                                     \
212         MIRROR_EXTEND_USAGE                                             \
213         "                 DIRECTORY|FILENAME\n"
214
215 #define MIGRATE_USAGE                                                   \
216         SSM_CMD_COMMON("migrate  ")                                     \
217         "                 [--block|-b] [--non-block|-n]\n"              \
218         "                 [--non-direct|-D] [--verbose|-v]\n"           \
219         "                 FILENAME\n"
220
221 #define SETDIRSTRIPE_USAGE                                              \
222         "               [--mdt-count|-c stripe_count>\n"                \
223         "               [--help|-h] [--mdt-hash|-H mdt_hash]\n"         \
224         "               [--mdt-index|-i mdt_index[,mdt_index,...]\n"    \
225         "               [--default|-D] [--mode|-o mode]\n"              \
226         "               [--max-inherit|-X max_inherit]\n"               \
227         "               [--max-inherit-rr max_inherit_rr] <dir>\n"      \
228         "To create dir with a foreign (free format) layout :\n"         \
229         "setdirstripe|mkdir --foreign[=FOREIGN_TYPE] -x|-xattr STRING " \
230         "               [--mode|-o MODE] [--flags HEX] DIRECTORY\n"
231
232 /**
233  * command_t mirror_cmdlist - lfs mirror commands.
234  */
235 command_t mirror_cmdlist[] = {
236         { .pc_name = "create", .pc_func = lfs_mirror_create,
237           .pc_help = "Create a mirrored file.\n"
238                 "usage: lfs mirror create --mirror-count|-N[MIRROR_COUNT]\n"
239                 "           [SETSTRIPE_OPTIONS] ... FILENAME|DIRECTORY ...\n" },
240         { .pc_name = "delete", .pc_func = lfs_mirror_delete,
241           .pc_help = "Delete a mirror from a file.\n"
242         "usage: lfs mirror delete {--mirror-id <mirror_id> |\n"
243         "\t               --component-id|--comp-id|-I COMP_ID |\n"
244         "\t               -p <pool>} MIRRORED_FILE ...\n"
245         },
246         { .pc_name = "extend", .pc_func = lfs_mirror_extend,
247           .pc_help = "Extend a mirrored file.\n"
248                 "usage: lfs mirror extend "
249                 "{--mirror-count|-N[MIRROR_COUNT]} [--no-verify] "
250                 "[SETSTRIPE_OPTIONS|-f VICTIM_FILE] ... FILENAME ...\n" },
251         { .pc_name = "split", .pc_func = lfs_mirror_split,
252           .pc_help = "Split a mirrored file.\n"
253         "usage: lfs mirror split {--mirror-id MIRROR_ID |\n"
254         "\t             --component-id|-I COMP_ID|-p POOL} [--destroy|-d]\n"
255         "\t             [-f NEW_FILE] MIRRORED_FILE ...\n" },
256         { .pc_name = "read", .pc_func = lfs_mirror_read,
257           .pc_help = "Read the content of a specified mirror of a file.\n"
258                 "usage: lfs mirror read {--mirror-id|-N MIRROR_ID}\n"
259                 "\t\t[--outfile|-o <output_file>] <mirrored_file>\n" },
260         { .pc_name = "write", .pc_func = lfs_mirror_write,
261           .pc_help = "Write to a specified mirror of a file.\n"
262                 "usage: lfs mirror write {--mirror-id|-N MIRROR_ID}\n"
263                 "\t\t[--inputfile|-i <input_file>] <mirrored_file>\n" },
264         { .pc_name = "copy", .pc_func = lfs_mirror_copy,
265           .pc_help = "Copy a specified mirror to other mirror(s) of a file.\n"
266                 "usage: lfs mirror copy {--read-mirror|-i MIRROR_ID0}\n"
267                 "\t\t{--write-mirror|-o MIRROR_ID1[,...]} <mirrored_file>\n" },
268         { .pc_name = "resync", .pc_func = lfs_mirror_resync,
269           .pc_help = "Resynchronizes out-of-sync mirrored file(s).\n"
270                 "usage: lfs mirror resync [--only MIRROR_ID[,...]>]\n"
271                 "\t\t<mirrored_file> [<mirrored_file2>...]\n" },
272         { .pc_name = "verify", .pc_func = lfs_mirror_verify,
273           .pc_help = "Verify mirrored file(s).\n"
274                 "usage: lfs mirror verify [--only MIRROR_ID[,...]]\n"
275                 "\t\t[--verbose|-v] <mirrored_file> [<mirrored_file2> ...]\n" },
276         { .pc_name = "list-commands", .pc_func = lfs_mirror_list_commands,
277           .pc_help = "list commands supported by lfs mirror"},
278         { .pc_name = "help", .pc_func = Parser_help, .pc_help = "help" },
279         { .pc_name = "exit", .pc_func = Parser_quit, .pc_help = "quit" },
280         { .pc_name = "quit", .pc_func = Parser_quit, .pc_help = "quit" },
281         { .pc_help = NULL }
282 };
283
284 /**
285  * command_t pcc_cmdlist - lfs pcc commands.
286  */
287 command_t pcc_cmdlist[] = {
288         { .pc_name = "attach", .pc_func = lfs_pcc_attach,
289           .pc_help = "Attach given files to the Persistent Client Cache.\n"
290                 "usage: lfs pcc attach <--id|-i NUM> <file> ...\n"
291                 "\t-i: archive id for RW-PCC\n" },
292         { .pc_name = "attach_fid", .pc_func = lfs_pcc_attach_fid,
293           .pc_help = "Attach given files into PCC by FID(s).\n"
294                 "usage: lfs pcc attach_id {--id|-i NUM} {--mnt|-m MOUNTPOINT} FID ...\n"
295                 "\t-i: archive id for RW-PCC\n"
296                 "\t-m: Lustre mount point\n" },
297         { .pc_name = "state", .pc_func = lfs_pcc_state,
298           .pc_help = "Display the PCC state for given files.\n"
299                 "usage: lfs pcc state <file> ...\n" },
300         { .pc_name = "detach", .pc_func = lfs_pcc_detach,
301           .pc_help = "Detach given files from the Persistent Client Cache.\n"
302                 "usage: lfs pcc detach <file> ...\n" },
303         { .pc_name = "detach_fid", .pc_func = lfs_pcc_detach_fid,
304           .pc_help = "Detach given files from PCC by FID(s).\n"
305                 "usage: lfs pcc detach_fid <mntpath> <fid>...\n" },
306         { .pc_name = "list-commands", .pc_func = lfs_pcc_list_commands,
307           .pc_help = "list commands supported by lfs pcc"},
308         { .pc_name = "help", .pc_func = Parser_help, .pc_help = "help" },
309         { .pc_name = "exit", .pc_func = Parser_quit, .pc_help = "quit" },
310         { .pc_name = "quit", .pc_func = Parser_quit, .pc_help = "quit" },
311         { .pc_help = NULL }
312 };
313
314 /* all available commands */
315 command_t cmdlist[] = {
316         {"setstripe", lfs_setstripe, 0,
317          "To create a file with specified striping/composite layout, or\n"
318          "create/replace the default layout on an existing directory:\n"
319          SSM_CMD_COMMON("setstripe")
320          "                 [--mode MODE]\n"
321          "                 <directory|filename>\n"
322          " or\n"
323          "To add component(s) to an existing composite file:\n"
324          SSM_CMD_COMMON("setstripe --component-add")
325          "To totally delete the default striping from an existing directory:\n"
326          "usage: setstripe [--delete|-d] <directory>\n"
327          " or\n"
328          "To create a mirrored file or set s default mirror layout on a directory:\n"
329          "usage: setstripe {--mirror-count|-N}[MIRROR_COUNT] [SETSTRIPE_OPTIONS] <directory|filename>\n"
330          " or\n"
331          "To delete the last component(s) from an existing composite file\n"
332          "(note that this will also delete any data in those components):\n"
333          "usage: setstripe --component-del [--component-id|-I COMP_ID]\n"
334          "                               [--component-flags|-F COMP_FLAGS]\n"
335          "                               <filename>\n"
336          "\tCOMP_ID:     Unique component ID to delete\n"
337          "\tCOMP_FLAGS:  'init' indicating all instantiated components\n"
338          "\t             '^init' indicating all uninstantiated components\n"
339          "\t-I and -F cannot be specified at the same time\n"
340          " or\n"
341          "To set or clear flags on a specific component\n"
342          "(note that this command can only be applied to mirrored files:\n"
343          "usage: setstripe --comp-set {-I COMP_ID|--comp-flags=COMP_FLAGS}\n"
344          "                            <filename>\n"
345          " or\n"
346          "To create a file with a foreign (free format) layout:\n"
347          "usage: setstripe --foreign[=FOREIGN_TYPE]\n"
348          "                 --xattr|-x LAYOUT_STRING [--flags HEX]\n"
349          "                 [--mode MODE] <filename>\n"},
350         {"getstripe", lfs_getstripe, 0,
351          "To list the layout pattern for a given file or files in a\n"
352          "directory or recursively for all files in a directory tree.\n"
353          "usage: getstripe [--ost|-O UUID] [--quiet|-q] [--verbose|-v]\n"
354          "                 [--stripe-count|-c] [--stripe-index|-i] [--fid|-F]\n"
355          "                 [--pool|-p] [--stripe-size|-S] [--directory|-d]\n"
356          "                 [--mdt-index|-m] [--recursive|-r] [--raw|-R]\n"
357          "                 [--layout|-L] [--generation|-g] [--yaml|-y]\n"
358          "                 [--help|-h] [--component-id|-I[=COMP_ID]]\n"
359          "                 [--component-flags[=COMP_FLAGS]]\n"
360          "                 [--component-count]\n"
361          "                 [--extension-size|--ext-size|-z]\n"
362          "                 [--component-start[=[+-]COMP_START]]\n"
363          "                 [--component-end[=[+-]COMP_END]|-E[[+-]comp_end]]\n"
364          "                 [[!] --mirror-index=[+-]INDEX |\n"
365          "                 [!] --mirror-id=[+-]MIRROR_ID] [--mirror-count|-N]\n"
366          "                 <directory|filename> ..."},
367         {"setdirstripe", lfs_setdirstripe, 0,
368          "Create striped directory on specified MDT, same as mkdir.\n"
369          "May be restricted to root or group users, depending on settings.\n"
370          "usage: setdirstripe [OPTION] <directory>\n"
371          SETDIRSTRIPE_USAGE},
372         {"getdirstripe", lfs_getdirstripe, 0,
373          "To list the layout pattern info for a given directory\n"
374          "or recursively for all directories in a directory tree.\n"
375          "usage: getdirstripe [--mdt-count|-c] [--mdt-index|-m|-i]\n"
376          "                    [--help|-h] [--mdt-hash|-H] [--obd|-O UUID]\n"
377          "                    [--recursive|-r] [--yaml|-y]\n"
378          "                    [--verbose|-v] [--default|-D]\n"
379          "                    [--max-inherit|-X]\n"
380          "                    [--max-inherit-rr] <dir> ..."},
381         {"mkdir", lfs_setdirstripe, 0,
382          "Create striped directory on specified MDT, same as setdirstripe.\n"
383          "usage: mkdir [OPTION] <directory>\n"
384          SETDIRSTRIPE_USAGE},
385         {"rm_entry", lfs_rmentry, 0,
386          "To remove the name entry of the remote directory. Note: This\n"
387          "command will only delete the name entry, i.e. the remote directory\n"
388          "will become inaccessable after this command. This can only be done\n"
389          "by the administrator\n"
390          "usage: rm_entry <dir>\n"},
391         {"unlink_foreign", lfs_unlink_foreign, 0,
392          "To remove the foreign file/dir.\n"
393          "Note: This is for files/dirs prevented to be removed using\n"
394          "unlink/rmdir, but works also for regular ones\n"
395          "usage: unlink_foreign <foreign_dir/file> [<foreign_dir/file> ...]\n"},
396         {"pool_list", lfs_poollist, 0,
397          "List pools or pool OSTs\n"
398          "usage: pool_list <fsname>[.<pool>] | <pathname>\n"},
399         {"find", lfs_find, 0,
400          "find files matching given attributes recursively in directory tree.\n"
401          "usage: find <directory|filename> ...\n"
402          "     [[!] --atime|-A [+-]N[smhdwy]] [[!] --btime|-B [+-]N[smhdwy]]\n"
403          "     [[!] --ctime|-C [+-]N[smhdwy]] [[!] --mtime|-M [+-]N[smhdwy]]\n"
404          "     [[!] --blocks|-b N] [[!] --component-count [+-]<comp_cnt>]\n"
405          "     [[!] --component-start [+-]N[kMGTPE]]\n"
406          "     [[!] --component-end|-E [+-]N[kMGTPE]]\n"
407          "     [[!] --component-flags {init,stale,prefer,offline,nosync,extension}]\n"
408          "     [[!] --extension-size|--ext-size|-z [+-]N[kMGT]]\n"
409          "     [[!] --foreign[=<foreign_type>]]\n"
410          "     [[!] --gid|-g|--group|-G <gid>|<gname>] [--help|-h]\n"
411          "     [[!] --layout|-L released,raid0,mdt] [--lazy]\n"
412          "     [--maxdepth|-D N] [[!] --mdt-count|-T [+-]<stripes>]\n"
413          "     [[!] --mdt-hash|-H <[^][blm],[^]fnv_1a_64,all_char,crush,...>\n"
414          "     [[!] --mdt-index|--mdt|-m <uuid|index,...>]\n"
415          "     [[!] --mirror-count|-N [+-]<n>]\n"
416          "     [[!] --mirror-state <[^]state>]\n"
417          "     [[!] --name|-n <pattern>] [[!] --newer[XY] <reference>]\n"
418          "     [[!] --ost|-O <uuid|index,...>] [[!] --perm [/-]mode]\n"
419          "     [[!] --pool <pool>] [--print|-P] [--print0|-0] [--printf <format>]\n"
420          "     [[!] --projid <projid>] [[!] --size|-s [+-]N[bkMGTPE]]\n"
421          "     [[!] --stripe-count|-c [+-]<stripes>]\n"
422          "     [[!] --stripe-index|-i <index,...>]\n"
423          "     [[!] --stripe-size|-S [+-]N[kMGT]] [[!] --type|-t <filetype>]\n"
424          "     [[!] --uid|-u|--user|-U <uid>|<uname>]\n"
425          "\t !: used before an option indicates 'NOT' requested attribute\n"
426          "\t -: used before a value indicates less than requested value\n"
427          "\t +: used before a value indicates more than requested value\n"
428          "\t ^: used before a flag indicates to exclude it\n"},
429         {"check", lfs_check, 0,
430          "Display the status of MGTs, MDTs or OSTs (as specified in the command)\n"
431          "or all the servers (MGTs, MDTs and OSTs).\n"
432          "usage: check {mgts|osts|mdts|all}"},
433         {"osts", lfs_osts, 0, "list OSTs connected to client "
434          "[for specified path only]\n" "usage: osts [path]"},
435         {"mdts", lfs_mdts, 0, "list MDTs connected to client "
436          "[for specified path only]\n" "usage: mdts [path]"},
437         {"df", lfs_df, 0,
438          "report filesystem disk space usage or inodes usage "
439          "of each MDS and all OSDs or a batch belonging to a specific pool.\n"
440          "Usage: df [--inodes|-i] [--human-readable|-h] [--lazy|-l]\n"
441          "          [--pool|-p <fsname>[.<pool>]] [path]"},
442         {"getname", lfs_getname, 0,
443          "list instances and specified mount points [for specified path only]\n"
444          "Usage: getname [--help|-h] [--instance|-i] [--fsname|-n] [path ...]"},
445 #ifdef HAVE_SYS_QUOTA_H
446         {"setquota", lfs_setquota, 0, "Set filesystem quotas.\n"
447          "usage: setquota [-t][-D] {-u|-U|-g|-G|-p|-P} {-b|-B|-i|-I LIMIT} [--pool POOL] FILESYSTEM\n"
448          "       setquota {-u|-g|-p} --delete FILESYSTEM\n"},
449         {"quota", lfs_quota, 0, "Display disk usage and limits.\n"
450          "usage: quota [-q] [-v] [-h] [-o OBD_UUID|-i MDT_IDX|-I OST_IDX]\n"
451          "             [{-u|-g|-p} UNAME|UID|GNAME|GID|PROJID]\n"
452          "             [--pool <OST pool name>] <filesystem>\n"
453          "       quota -t <-u|-g|-p> [--pool <OST pool name>] <filesystem>\n"
454          "       quota [-q] [-v] [h] {-U|-G|-P} [--pool <OST pool name>] <filesystem>"},
455         {"project", lfs_project, 0,
456          "Change or list project attribute for specified file or directory.\n"
457          "usage: project [-d|-r] <file|directory...>\n"
458          "         list project ID and flags on file(s) or directories\n"
459          "       project [-p id] [-s] [-r] <file|directory...>\n"
460          "         set project ID and/or inherit flag for specified file(s) or directories\n"
461          "       project -c [-d|-r [-p id] [-0]] <file|directory...>\n"
462          "         check project ID and flags on file(s) or directories, print outliers\n"
463          "       project -C [-d|-r] [-k] <file|directory...>\n"
464          "         clear the project inherit flag and ID on the file or directory\n"
465         },
466 #endif
467         {"flushctx", lfs_flushctx, 0,
468          "Flush security context for current user.\n"
469          "usage: flushctx [-k] [-r] [mountpoint...]"},
470         {"changelog", lfs_changelog, 0,
471          "Show the metadata changes on an MDT."
472          "\nusage: changelog <mdtname> [startrec [endrec]]"},
473         {"changelog_clear", lfs_changelog_clear, 0,
474          "Indicate that old changelog records up to <endrec> are no longer of "
475          "interest to consumer <id>, allowing the system to free up space.\n"
476          "An <endrec> of 0 means all records.\n"
477          "usage: changelog_clear <mdtname> <id> <endrec>"},
478         {"fid2path", lfs_fid2path, 0,
479          "Resolve the full path(s) for given FID(s). For a specific hardlink "
480          "specify link number <linkno>.\n"
481          "usage: fid2path [--print-fid|-f] [--print-link|-c] [--link|-l <linkno>] "
482          "<fsname|root> <fid>..."},
483         {"path2fid", lfs_path2fid, 0, "Display the fid(s) for a given path(s).\n"
484          "usage: path2fid [--parents] <path> ..."},
485         {"rmfid", lfs_rmfid, 0, "Remove file(s) by FID(s)\n"
486          "usage: rmfid <fsname|rootpath> <fid> ..."},
487         {"data_version", lfs_data_version, 0, "Display file data version for "
488          "a given path.\n" "usage: data_version [-n|-r|-w] <path>"},
489         {"hsm_state", lfs_hsm_state, 0, "Display the HSM information (states, "
490          "undergoing actions) for given files.\n usage: hsm_state <file> ..."},
491         {"hsm_set", lfs_hsm_set, 0, "Set HSM user flag on specified files.\n"
492          "usage: hsm_set [--norelease] [--noarchive] [--dirty] [--exists] "
493          "[--archived] [--lost] [--archive-id NUM] <file> ..."},
494         {"hsm_clear", lfs_hsm_clear, 0, "Clear HSM user flag on specified "
495          "files.\n"
496          "usage: hsm_clear [--norelease] [--noarchive] [--dirty] [--exists] "
497          "[--archived] [--lost] <file> ..."},
498         {"hsm_action", lfs_hsm_action, 0, "Display current HSM request for "
499          "given files.\n" "usage: hsm_action <file> ..."},
500         {"hsm_archive", lfs_hsm_archive, 0,
501          "Archive file to external storage.\n"
502          "usage: hsm_archive [--filelist FILELIST] [--data DATA] [--archive NUM] "
503          "<file> ..."},
504         {"hsm_restore", lfs_hsm_restore, 0,
505          "Restore file from external storage.\n"
506          "usage: hsm_restore [--filelist FILELIST] [--data DATA] <file> ..."},
507         {"hsm_release", lfs_hsm_release, 0,
508          "Release files from Lustre.\n"
509          "usage: hsm_release [--filelist FILELIST] [--data DATA] <file> ..."},
510         {"hsm_remove", lfs_hsm_remove, 0,
511          "Remove file copy from external storage.\n"
512          "usage: hsm_remove [--filelist FILELIST] [--data DATA] "
513          "[--archive NUM]\n"
514          "                  (FILE [FILE ...] | "
515          "--mntpath MOUNTPATH FID [FID ...])\n"
516          "\n"
517          "Note: To remove an archived copy of a file already deleted from a "
518          "Lustre FS, the\n"
519          "--mntpath option and a list of FIDs must be specified"
520         },
521         {"hsm_cancel", lfs_hsm_cancel, 0,
522          "Cancel requests related to specified files.\n"
523          "usage: hsm_cancel [--filelist FILELIST] [--data DATA] <file> ..."},
524         {"swap_layouts", lfs_swap_layouts, 0, "Swap layouts between 2 files.\n"
525          "usage: swap_layouts <path1> <path2>"},
526         {"migrate", lfs_setstripe_migrate, 0,
527          "migrate directories and their inodes between MDTs.\n"
528          "usage: migrate [--mdt-count|-c STRIPE_COUNT] [--directory|-d]\n"
529          "               [--mdt-hash|-H HASH_TYPE]\n"
530          "               [--mdt-index|-m START_MDT_INDEX] [--verbose|-v]\n"
531          "               DIRECTORY\n"
532          "\n"
533          "migrate file objects from one OST layout to another\n"
534          "(may be not safe with concurent writes).\n"
535          MIGRATE_USAGE },
536         {"mv", lfs_mv, 0,
537          "To move directories between MDTs. This command is deprecated, "
538          "use \"migrate\" instead.\n"
539          "usage: mv <directory|filename> [--mdt-index|-m MDT_INDEX] "
540          "[--verbose|-v]\n"},
541         {"ladvise", lfs_ladvise, 0,
542          "Provide servers with advice about access patterns for a file.\n"
543          "usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]\n"
544          "               [--background|-b] [--unset|-u]\n\n"
545          "               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}\n"
546          "               {[--mode|-m [READ,WRITE]}\n"
547          "               <file> ...\n"},
548         {"mirror", lfs_mirror, mirror_cmdlist,
549          "lfs commands used to manage files with mirrored components:\n"
550          "lfs mirror create - create a mirrored file or directory\n"
551          "lfs mirror extend - add mirror(s) to an existing file\n"
552          "lfs mirror split  - split a mirror from an existing mirrored file\n"
553          "lfs mirror resync - resynchronize out-of-sync mirrored file(s)\n"
554          "lfs mirror read   - read a mirror content of a mirrored file\n"
555          "lfs mirror write  - write to a mirror of a mirrored file\n"
556          "lfs mirror copy   - copy a mirror to other mirror(s) of a file\n"
557          "lfs mirror verify - verify mirrored file(s)\n"},
558         {"getsom", lfs_getsom, 0, "To list the SOM info for a given file.\n"
559          "usage: getsom [-s] [-b] [-f] <path>\n"
560          "\t-s: Only show the size value of the SOM data for a given file\n"
561          "\t-b: Only show the blocks value of the SOM data for a given file\n"
562          "\t-f: Only show the flags value of the SOM data for a given file\n"},
563         {"heat_get", lfs_heat_get, 0,
564          "To get heat of files.\n"
565          "usage: heat_get <file> ...\n"},
566         {"heat_set", lfs_heat_set, 0,
567          "To set heat flags of files.\n"
568          "usage: heat_set [--clear|-c] [--off|-o] [--on|-O] <file> ...\n"
569          "\t--clear|-c: Clear file heat for given files\n"
570          "\t--off|-o:   Turn off file heat for given files\n"
571          "\t--on|-O:    Turn on file heat for given files\n"},
572         {"pcc", lfs_pcc, pcc_cmdlist,
573          "lfs commands used to interact with PCC features:\n"
574          "lfs pcc attach - attach given files to Persistent Client Cache\n"
575          "lfs pcc attach_fid - attach given files into PCC by FID(s)\n"
576          "lfs pcc state  - display the PCC state for given files\n"
577          "lfs pcc detach - detach given files from Persistent Client Cache\n"
578          "lfs pcc detach_fid - detach given files from PCC by FID(s)\n"},
579         {"help", Parser_help, 0, "help"},
580         {"exit", Parser_quit, 0, "quit"},
581         {"quit", Parser_quit, 0, "quit"},
582         {"--version", Parser_version, 0,
583          "output build version of the utility and exit"},
584         {"--list-commands", lfs_list_commands, 0,
585          "list commands supported by the utility and exit"},
586         { 0, 0, 0, NULL }
587 };
588
589 static int check_hashtype(const char *hashtype)
590 {
591         int type_num = atoi(hashtype);
592         int i;
593
594         /* numeric hash type */
595         if (hashtype && lmv_is_known_hash_type(type_num))
596                 return type_num;
597         /* string hash type */
598         for (i = LMV_HASH_TYPE_ALL_CHARS; i < ARRAY_SIZE(mdt_hash_name); i++)
599                 if (strcmp(hashtype, mdt_hash_name[i]) == 0)
600                         return i;
601
602         return 0;
603 }
604
605 static uint32_t check_foreign_type_name(const char *foreign_type_name)
606 {
607         uint32_t i;
608
609         for (i = 0; i < LU_FOREIGN_TYPE_UNKNOWN; i++) {
610                 if (!lu_foreign_types[i].lft_name)
611                         break;
612                 if (strcmp(foreign_type_name,
613                            lu_foreign_types[i].lft_name) == 0)
614                         return lu_foreign_types[i].lft_type;
615         }
616
617         return LU_FOREIGN_TYPE_UNKNOWN;
618 }
619
620 static const char *error_loc = "syserror";
621
622 static int
623 migrate_open_files(const char *name, __u64 migration_flags,
624                    const struct llapi_stripe_param *param,
625                    struct llapi_layout *layout, int *fd_src, int *fd_tgt)
626 {
627         int                      fd = -1;
628         int                      fdv = -1;
629         int                      rflags;
630         int                      mdt_index;
631         int                      random_value;
632         char                     parent[PATH_MAX];
633         char                     volatile_file[PATH_MAX];
634         char                    *ptr;
635         int                      rc;
636         struct stat              st;
637         struct stat              stv;
638
639         if (!param && !layout) {
640                 error_loc = "layout information";
641                 return -EINVAL;
642         }
643
644         /* search for file directory pathname */
645         if (strlen(name) > sizeof(parent) - 1) {
646                 error_loc = "source file name";
647                 return -ERANGE;
648         }
649
650         strncpy(parent, name, sizeof(parent));
651         ptr = strrchr(parent, '/');
652         if (!ptr) {
653                 if (!getcwd(parent, sizeof(parent))) {
654                         error_loc = "getcwd";
655                         return -errno;
656                 }
657         } else {
658                 if (ptr == parent) /* leading '/' */
659                         ptr = parent + 1;
660                 *ptr = '\0';
661         }
662
663         /* even if the file is only read, WR mode is nedeed to allow
664          * layout swap on fd
665          */
666         /* Allow migrating even without the key on encrypted files */
667         rflags = O_RDWR | O_NOATIME | O_FILE_ENC;
668         if (!(migration_flags & LLAPI_MIGRATION_NONDIRECT))
669                 rflags |= O_DIRECT;
670 source_open:
671         fd = open(name, rflags);
672         if (fd < 0) {
673                 /* If encrypted file without the key,
674                  * retry mirror extend in O_DIRECT.
675                  */
676                 if (errno == ENOKEY && !(rflags & O_DIRECT) &&
677                     migration_flags & LLAPI_MIGRATION_MIRROR) {
678                         rflags |= O_DIRECT;
679                         goto source_open;
680                 }
681                 rc = -errno;
682                 error_loc = "cannot open source file";
683                 return rc;
684         }
685
686         rc = llapi_file_fget_mdtidx(fd, &mdt_index);
687         if (rc < 0) {
688                 error_loc = "cannot get MDT index";
689                 goto out;
690         }
691
692         do {
693                 int open_flags = O_WRONLY | O_CREAT | O_EXCL | O_NOFOLLOW |
694                         /* Allow migrating without the key on encrypted files */
695                         O_FILE_ENC;
696                 mode_t open_mode = S_IRUSR | S_IWUSR;
697
698                 if (rflags & O_DIRECT)
699                         open_flags |= O_DIRECT;
700                 random_value = random();
701                 rc = snprintf(volatile_file, sizeof(volatile_file),
702                               "%s/%s:%.4X:%.4X:fd=%.2d", parent,
703                               LUSTRE_VOLATILE_HDR, mdt_index,
704                               random_value, fd);
705                 if (rc >= sizeof(volatile_file)) {
706                         rc = -ENAMETOOLONG;
707                         break;
708                 }
709
710                 /* create, open a volatile file, use caching (ie no directio) */
711                 if (layout) {
712                         /* Returns -1 and sets errno on error: */
713                         fdv = llapi_layout_file_open(volatile_file, open_flags,
714                                                      open_mode, layout);
715                         if (fdv < 0)
716                                 fdv = -errno;
717                 } else {
718                         /* Does the right thing on error: */
719                         fdv = llapi_file_open_param(volatile_file, open_flags,
720                                                     open_mode, param);
721                 }
722         } while (fdv < 0 && (rc = fdv) == -EEXIST);
723
724         if (rc < 0) {
725                 error_loc = "cannot create volatile file";
726                 goto out;
727         }
728
729         /*
730          * In case the MDT does not support creation of volatile files
731          * we should try to unlink it.
732          */
733         (void)unlink(volatile_file);
734
735         /*
736          * Not-owner (root?) special case.
737          * Need to set owner/group of volatile file like original.
738          * This will allow to pass related check during layout_swap.
739          */
740         rc = fstat(fd, &st);
741         if (rc != 0) {
742                 rc = -errno;
743                 error_loc = "cannot stat source file";
744                 goto out;
745         }
746
747         rc = fstat(fdv, &stv);
748         if (rc != 0) {
749                 rc = -errno;
750                 error_loc = "cannot stat volatile";
751                 goto out;
752         }
753
754         if (st.st_uid != stv.st_uid || st.st_gid != stv.st_gid) {
755                 rc = fchown(fdv, st.st_uid, st.st_gid);
756                 if (rc != 0) {
757                         rc = -errno;
758                         error_loc = "cannot change ownwership of volatile";
759                         goto out;
760                 }
761         }
762
763 out:
764         if (rc < 0) {
765                 if (fd > 0)
766                         close(fd);
767                 if (fdv > 0)
768                         close(fdv);
769         } else {
770                 *fd_src = fd;
771                 *fd_tgt = fdv;
772                 error_loc = NULL;
773         }
774         return rc;
775 }
776
777 static int migrate_copy_data(int fd_src, int fd_dst, int (*check_file)(int))
778 {
779         struct llapi_layout *layout;
780         size_t buf_size = 4 * 1024 * 1024;
781         void *buf = NULL;
782         off_t pos = 0;
783         off_t data_end = 0;
784         size_t page_size = sysconf(_SC_PAGESIZE);
785         bool sparse;
786         int rc;
787
788         layout = llapi_layout_get_by_fd(fd_src, 0);
789         if (layout) {
790                 uint64_t stripe_size;
791
792                 rc = llapi_layout_stripe_size_get(layout, &stripe_size);
793                 if (rc == 0)
794                         buf_size = stripe_size;
795
796                 llapi_layout_free(layout);
797         }
798
799         /* Use a page-aligned buffer for direct I/O */
800         rc = posix_memalign(&buf, page_size, buf_size);
801         if (rc != 0)
802                 return -rc;
803
804         sparse = llapi_file_is_sparse(fd_src);
805         if (sparse) {
806                 rc = ftruncate(fd_dst, pos);
807                 if (rc < 0) {
808                         rc = -errno;
809                         return rc;
810                 }
811         }
812
813         while (1) {
814                 off_t data_off;
815                 size_t to_read, to_write;
816                 ssize_t rsize;
817
818                 if (sparse && pos >= data_end) {
819                         size_t data_size;
820
821                         data_off = llapi_data_seek(fd_src, pos, &data_size);
822                         if (data_off < 0) {
823                                 /* Non-fatal, switch to full copy */
824                                 sparse = false;
825                                 continue;
826                         }
827                         /* hole at the end of file, truncate up to it */
828                         if (!data_size) {
829                                 rc = ftruncate(fd_dst, data_off);
830                                 if (rc < 0)
831                                         goto out;
832                         }
833                         pos = data_off & ~(page_size - 1);
834                         data_end = data_off + data_size;
835                         to_read = ((data_end - pos - 1) | (page_size - 1)) + 1;
836                         to_read = MIN(to_read, buf_size);
837                 } else {
838                         to_read = buf_size;
839                 }
840
841                 if (check_file) {
842                         rc = check_file(fd_src);
843                         if (rc < 0)
844                                 goto out;
845                 }
846
847                 rsize = pread(fd_src, buf, to_read, pos);
848                 if (rsize < 0) {
849                         rc = -errno;
850                         goto out;
851                 }
852                 /* EOF */
853                 if (rsize == 0)
854                         break;
855
856                 to_write = rsize;
857                 while (to_write > 0) {
858                         ssize_t written;
859
860                         written = pwrite(fd_dst, buf, to_write, pos);
861                         if (written < 0) {
862                                 rc = -errno;
863                                 goto out;
864                         }
865                         pos += written;
866                         to_write -= written;
867                 }
868                 if (rc || rsize < to_read)
869                         break;
870         }
871
872         rc = fsync(fd_dst);
873         if (rc < 0)
874                 rc = -errno;
875 out:
876         /* Try to avoid page cache pollution after migration. */
877         (void)posix_fadvise(fd_src, 0, 0, POSIX_FADV_DONTNEED);
878         (void)posix_fadvise(fd_dst, 0, 0, POSIX_FADV_DONTNEED);
879
880         free(buf);
881         return rc;
882 }
883
884 static int migrate_set_timestamps(int fd, const struct stat *st)
885 {
886         struct timeval tv[2] = {
887                 {.tv_sec = st->st_atime},
888                 {.tv_sec = st->st_mtime}
889         };
890
891         return futimes(fd, tv);
892 }
893
894 static int migrate_block(int fd, int fdv)
895 {
896         struct stat st;
897         __u64   dv1;
898         int     gid;
899         int     rc;
900         int     rc2;
901
902         rc = fstat(fd, &st);
903         if (rc < 0) {
904                 error_loc = "cannot stat source file";
905                 return -errno;
906         }
907
908         rc = llapi_get_data_version(fd, &dv1, LL_DV_RD_FLUSH);
909         if (rc < 0) {
910                 error_loc = "cannot get dataversion";
911                 return rc;
912         }
913
914         do
915                 gid = random();
916         while (gid == 0);
917
918         /*
919          * The grouplock blocks all concurrent accesses to the file.
920          * It has to be taken after llapi_get_data_version as it would
921          * block it too.
922          */
923         rc = llapi_group_lock(fd, gid);
924         if (rc < 0) {
925                 error_loc = "cannot get group lock";
926                 return rc;
927         }
928
929         rc = migrate_copy_data(fd, fdv, NULL);
930         if (rc < 0) {
931                 error_loc = "data copy failed";
932                 goto out_unlock;
933         }
934
935         /* Make sure we keep original atime/mtime values */
936         rc = migrate_set_timestamps(fdv, &st);
937         if (rc < 0) {
938                 error_loc = "set target file timestamp failed";
939                 goto out_unlock;
940         }
941
942         /*
943          * swap layouts
944          * for a migration we need to check data version on file did
945          * not change.
946          *
947          * Pass in gid=0 since we already own grouplock.
948          */
949         rc = llapi_fswap_layouts_grouplock(fd, fdv, dv1, 0, 0,
950                                            SWAP_LAYOUTS_CHECK_DV1);
951         if (rc == -EAGAIN) {
952                 error_loc = "file changed";
953                 goto out_unlock;
954         } else if (rc < 0) {
955                 error_loc = "cannot swap layout";
956                 goto out_unlock;
957         }
958
959 out_unlock:
960         rc2 = llapi_group_unlock(fd, gid);
961         if (rc2 < 0 && rc == 0) {
962                 error_loc = "unlock group lock";
963                 rc = rc2;
964         }
965
966         return rc;
967 }
968
969 /**
970  * Internal helper for migrate_copy_data(). Check lease and report error if
971  * need be.
972  *
973  * \param[in]  fd           File descriptor on which to check the lease.
974  *
975  * \retval 0       Migration can keep on going.
976  * \retval -errno  Error occurred, abort migration.
977  */
978 static int check_lease(int fd)
979 {
980         int rc;
981
982         rc = llapi_lease_check(fd);
983         if (rc > 0)
984                 return 0; /* llapi_check_lease returns > 0 on success. */
985
986         return -EBUSY;
987 }
988
989 static int migrate_nonblock(int fd, int fdv)
990 {
991         struct stat st;
992         __u64   dv1;
993         __u64   dv2;
994         int     rc;
995
996         rc = fstat(fd, &st);
997         if (rc < 0) {
998                 error_loc = "cannot stat source file";
999                 return -errno;
1000         }
1001
1002         rc = llapi_get_data_version(fd, &dv1, LL_DV_RD_FLUSH);
1003         if (rc < 0) {
1004                 error_loc = "cannot get data version";
1005                 return rc;
1006         }
1007
1008         rc = migrate_copy_data(fd, fdv, check_lease);
1009         if (rc < 0) {
1010                 error_loc = "data copy failed";
1011                 return rc;
1012         }
1013
1014         rc = llapi_get_data_version(fd, &dv2, LL_DV_RD_FLUSH);
1015         if (rc != 0) {
1016                 error_loc = "cannot get data version";
1017                 return rc;
1018         }
1019
1020         if (dv1 != dv2) {
1021                 rc = -EAGAIN;
1022                 error_loc = "source file changed";
1023                 return rc;
1024         }
1025
1026         /* Make sure we keep original atime/mtime values */
1027         rc = migrate_set_timestamps(fdv, &st);
1028         if (rc < 0) {
1029                 error_loc = "set target file timestamp failed";
1030                 return -errno;
1031         }
1032         return 0;
1033 }
1034
1035 static
1036 int lfs_layout_compid_by_pool(char *fname, const char *pool, int *comp_id)
1037 {
1038         struct pool_to_id_cbdata data = { .pool = pool };
1039         struct llapi_layout *layout = NULL;
1040         int rc;
1041
1042         layout = llapi_layout_get_by_path(fname, 0);
1043         if (!layout) {
1044                 fprintf(stderr,
1045                         "error %s: file '%s' couldn't get layout: rc=%d\n",
1046                         progname, fname, errno);
1047                 rc = -errno;
1048                 goto free_layout;
1049         }
1050         rc = llapi_layout_sanity(layout, false, true);
1051         if (rc < 0) {
1052                 llapi_layout_sanity_perror(errno);
1053                 goto free_layout;
1054         }
1055         rc = llapi_layout_comp_iterate(layout, find_comp_id_by_pool, &data);
1056         if (rc < 0)
1057                 goto free_layout;
1058
1059         *comp_id = data.id;
1060         rc = 0;
1061
1062 free_layout:
1063         if (layout)
1064                 llapi_layout_free(layout);
1065         return rc;
1066 }
1067
1068 static int lfs_component_set(char *fname, int comp_id, const char *pool,
1069                              __u32 flags, __u32 neg_flags)
1070 {
1071         __u32 ids[2];
1072         __u32 flags_array[2];
1073         size_t count = 0;
1074         int rc;
1075
1076         if (!comp_id) {
1077                 if (pool == NULL) {
1078                         fprintf(stderr,
1079                                 "error %s: neither component id nor pool is specified\n",
1080                                 progname);
1081                         return -EINVAL;
1082                 }
1083                 rc = lfs_layout_compid_by_pool(fname, pool, &comp_id);
1084                 if (rc)
1085                         return rc;
1086         }
1087
1088         if (flags) {
1089                 ids[count] = comp_id;
1090                 flags_array[count] = flags;
1091                 ++count;
1092         }
1093
1094         if (neg_flags) {
1095                 if (neg_flags & LCME_FL_STALE) {
1096                         fprintf(stderr,
1097                                 "%s: cannot clear 'stale' flags from component. Please use lfs-mirror-resync(1) instead\n",
1098                                 progname);
1099                         return -EINVAL;
1100                 }
1101
1102                 ids[count] = comp_id;
1103                 flags_array[count] = neg_flags | LCME_FL_NEG;
1104                 ++count;
1105         }
1106
1107         rc = llapi_layout_file_comp_set(fname, ids, flags_array, count);
1108         if (rc) {
1109                 if (errno == EUCLEAN) {
1110                         rc = -errno;
1111                         fprintf(stderr,
1112                                 "%s: cannot set 'stale' flag on component '%#x' of the last non-stale mirror of '%s'\n",
1113                                 progname, comp_id, fname);
1114                 } else {
1115                         fprintf(stderr,
1116                                 "%s: cannot change the flags of component '%#x' of file '%s': %x / ^(%x)\n",
1117                                 progname, comp_id, fname, flags, neg_flags);
1118                 }
1119         }
1120
1121         return rc;
1122 }
1123
1124 static int lfs_component_del(char *fname, __u32 comp_id,
1125                              __u32 flags, __u32 neg_flags)
1126 {
1127         int     rc = 0;
1128
1129         if (flags && neg_flags) {
1130                 fprintf(stderr,
1131                         "%s: cannot specify both positive and negative flags\n",
1132                         progname);
1133                 return -EINVAL;
1134         }
1135
1136         if (!flags && neg_flags)
1137                 flags = neg_flags | LCME_FL_NEG;
1138
1139         if (flags && comp_id) {
1140                 fprintf(stderr,
1141                         "%s: cannot specify component ID and flags at the same time\n",
1142                         progname);
1143                 return -EINVAL;
1144         }
1145
1146         if (!flags && !comp_id) {
1147                 fprintf(stderr,
1148                         "%s: neither flags nor component ID is specified\n",
1149                         progname);
1150                 return -EINVAL;
1151         }
1152
1153         if (flags) {
1154                 if (flags & ~LCME_KNOWN_FLAGS) {
1155                         fprintf(stderr,
1156                                 "%s setstripe: unknown flags %#x\n",
1157                                 progname, flags);
1158                         return -EINVAL;
1159                 }
1160         } else if (comp_id > LCME_ID_MAX) {
1161                 fprintf(stderr, "%s setstripe: invalid component id %u\n",
1162                         progname, comp_id);
1163                 return -EINVAL;
1164         }
1165
1166         rc = llapi_layout_file_comp_del(fname, comp_id, flags);
1167         if (rc)
1168                 fprintf(stderr,
1169                         "%s setstripe: cannot delete component %#x from '%s': %s\n",
1170                         progname, comp_id, fname, strerror(errno));
1171         return rc;
1172 }
1173
1174 static int lfs_component_add(char *fname, struct llapi_layout *layout)
1175 {
1176         int     rc;
1177
1178         if (!layout)
1179                 return -EINVAL;
1180
1181         rc = llapi_layout_file_comp_add(fname, layout);
1182         if (rc)
1183                 fprintf(stderr, "Add layout component(s) to %s failed. %s\n",
1184                         fname, strerror(errno));
1185         return rc;
1186 }
1187
1188 static int lfs_component_create(char *fname, int open_flags, mode_t open_mode,
1189                                 struct llapi_layout *layout)
1190 {
1191         struct stat     st;
1192         int     fd;
1193
1194         if (!layout)
1195                 return -EINVAL;
1196
1197         fd = lstat(fname, &st);
1198         if (fd == 0 && S_ISDIR(st.st_mode))
1199                 open_flags = O_DIRECTORY | O_RDONLY;
1200
1201         fd = llapi_layout_file_open(fname, open_flags, open_mode, layout);
1202         if (fd < 0)
1203                 fprintf(stderr, "%s: cannot %s '%s': %s\n", progname,
1204                         S_ISDIR(st.st_mode) ?
1205                                 "set default composite layout for" :
1206                                 "create composite file",
1207                         fname, strerror(errno));
1208         return fd;
1209 }
1210
1211 static int lfs_migrate(char *name, __u64 migration_flags,
1212                        struct llapi_stripe_param *param,
1213                        struct llapi_layout *layout)
1214 {
1215         struct llapi_layout *existing;
1216         uint64_t dom_new, dom_cur;
1217         int fd = -1;
1218         int fdv = -1;
1219         int rc;
1220
1221         rc = migrate_open_files(name, migration_flags, param, layout,
1222                                 &fd, &fdv);
1223         if (rc < 0)
1224                 goto out;
1225
1226         rc = llapi_layout_dom_size(layout, &dom_new);
1227         if (rc) {
1228                 error_loc = "cannot get new layout DoM size";
1229                 goto out;
1230         }
1231         /* special case for migration to DOM layout*/
1232         existing = llapi_layout_get_by_fd(fd, 0);
1233         if (!existing) {
1234                 error_loc = "cannot get existing layout";
1235                 goto out;
1236         }
1237
1238         rc = llapi_layout_dom_size(existing, &dom_cur);
1239         if (rc) {
1240                 error_loc = "cannot get current layout DoM size";
1241                 goto out;
1242         }
1243
1244         /*
1245          * if file has DoM layout already then migration is possible to
1246          * the new layout with the same DoM component via swap layout,
1247          * if new layout used bigger DOM size, then mirroring is used
1248          */
1249         if (dom_new > dom_cur) {
1250                 rc = lfs_migrate_to_dom(fd, fdv, name, migration_flags);
1251                 if (rc)
1252                         error_loc = "cannot migrate to DOM layout";
1253                 goto out_closed;
1254         }
1255
1256         if (!(migration_flags & LLAPI_MIGRATION_NONBLOCK)) {
1257                 /*
1258                  * Blocking mode (forced if servers do not support file lease).
1259                  * It is also the default mode, since we cannot distinguish
1260                  * between a broken lease and a server that does not support
1261                  * atomic swap/close (LU-6785)
1262                  */
1263                 rc = migrate_block(fd, fdv);
1264                 goto out;
1265         }
1266
1267         rc = llapi_lease_acquire(fd, LL_LEASE_RDLCK);
1268         if (rc < 0) {
1269                 error_loc = "cannot get lease";
1270                 goto out;
1271         }
1272
1273         rc = migrate_nonblock(fd, fdv);
1274         if (rc < 0) {
1275                 llapi_lease_release(fd);
1276                 goto out;
1277         }
1278
1279         /*
1280          * Atomically put lease, swap layouts and close.
1281          * for a migration we need to check data version on file did
1282          * not change.
1283          */
1284         rc = llapi_fswap_layouts(fd, fdv, 0, 0, SWAP_LAYOUTS_CLOSE);
1285         if (rc < 0) {
1286                 error_loc = "cannot swap layout";
1287                 goto out;
1288         }
1289
1290 out:
1291         if (fd >= 0)
1292                 close(fd);
1293
1294         if (fdv >= 0)
1295                 close(fdv);
1296 out_closed:
1297         if (rc < 0)
1298                 fprintf(stderr, "error: %s: %s: %s: %s\n",
1299                         progname, name, error_loc, strerror(-rc));
1300         else if (migration_flags & LLAPI_MIGRATION_VERBOSE)
1301                 printf("%s\n", name);
1302
1303         return rc;
1304 }
1305
1306 static int comp_str2flags(char *string, __u32 *flags, __u32 *neg_flags)
1307 {
1308         char *name;
1309         char *dup_string = NULL;
1310         int rc = 0;
1311
1312         *flags = 0;
1313         *neg_flags = 0;
1314
1315         if (!string || !string[0])
1316                 return -EINVAL;
1317
1318         dup_string = strdup(string);
1319         if (!dup_string) {
1320                 llapi_printf(LLAPI_MSG_ERROR,
1321                              "%s: insufficient memory\n",
1322                              progname);
1323                 return -ENOMEM;
1324         }
1325
1326         for (name = strtok(dup_string, ","); name; name = strtok(NULL, ",")) {
1327                 bool found = false;
1328                 int i;
1329
1330                 for (i = 0; i < ARRAY_SIZE(comp_flags_table); i++) {
1331                         __u32 comp_flag = comp_flags_table[i].cfn_flag;
1332                         const char *comp_name = comp_flags_table[i].cfn_name;
1333
1334                         if (strcmp(name, comp_name) == 0) {
1335                                 *flags |= comp_flag;
1336                                 found = true;
1337                         } else if (strncmp(name, "^", 1) == 0 &&
1338                                    strcmp(name + 1, comp_name) == 0) {
1339                                 *neg_flags |= comp_flag;
1340                                 found = true;
1341                         }
1342                 }
1343                 if (!found) {
1344                         llapi_printf(LLAPI_MSG_ERROR,
1345                                      "%s: component flag '%s' not supported\n",
1346                                      progname, name);
1347                         rc = -EINVAL;
1348                         goto out_free;
1349                 }
1350         }
1351
1352         if (!*flags && !*neg_flags)
1353                 rc = -EINVAL;
1354
1355         /* don't allow to set and exclude the same flag */
1356         if (*flags & *neg_flags)
1357                 rc = -EINVAL;
1358
1359 out_free:
1360         free(dup_string);
1361         return rc;
1362 }
1363
1364 static int mdthash_input(char *string, __u32 *inflags,
1365                          __u32 *exflags, __u32 *type)
1366 {
1367         char *name;
1368         struct mhf_list {
1369                 char *name;
1370                 __u32 flag;
1371         } mhflist[] = {
1372                 {"migrating", LMV_HASH_FLAG_MIGRATION},
1373                 {"bad_type", LMV_HASH_FLAG_BAD_TYPE},
1374                 {"badtype", LMV_HASH_FLAG_BAD_TYPE},
1375                 {"lost_lmv", LMV_HASH_FLAG_LOST_LMV},
1376                 {"lostlmv", LMV_HASH_FLAG_LOST_LMV},
1377         };
1378
1379         if (string == NULL)
1380                 return -EINVAL;
1381
1382         *inflags = 0;
1383         *exflags = 0;
1384         *type = 0;
1385         for (name = strtok(string, ","); name; name = strtok(NULL, ",")) {
1386                 bool found = false;
1387                 int i;
1388
1389                 for (i = 0; i < ARRAY_SIZE(mhflist); i++) {
1390                         if (strcmp(name, mhflist[i].name) == 0 ||
1391                             name[0] == mhflist[i].name[0]) {
1392                                 *inflags |= mhflist[i].flag;
1393                                 found = true;
1394                         } else if (name[0] == '^' &&
1395                                    (strcmp(name + 1, mhflist[i].name) == 0 ||
1396                                     name[1] == mhflist[i].name[0])) {
1397                                 *exflags |= mhflist[i].flag;
1398                                 found = true;
1399                         }
1400                 }
1401                 if (!found) {
1402                         i = check_hashtype(name);
1403                         if (i > 0) {
1404                                 *type |= 1 << i;
1405                                 continue;
1406                         }
1407                         llapi_printf(LLAPI_MSG_ERROR,
1408                                      "%s: invalid mdt_hash value '%s'\n",
1409                                      progname, name);
1410                         return -EINVAL;
1411                 }
1412         }
1413
1414         /* don't allow to include and exclude the same flag */
1415         if (*inflags & *exflags) {
1416                 llapi_printf(LLAPI_MSG_ERROR,
1417                              "%s: include and exclude same flag '%s'\n",
1418                              progname, string);
1419                 return -EINVAL;
1420         }
1421
1422         return 0;
1423 }
1424
1425 static int mirror_str2state(char *string, __u16 *state, __u16 *neg_state)
1426 {
1427         if (!string)
1428                 return -EINVAL;
1429
1430         *state = 0;
1431         *neg_state = 0;
1432
1433         if (strncmp(string, "^", 1) == 0) {
1434                 *neg_state = llapi_layout_string_flags(string + 1);
1435                 if (*neg_state != 0)
1436                         return 0;
1437         } else {
1438                 *state = llapi_layout_string_flags(string);
1439                 if (*state != 0)
1440                         return 0;
1441         }
1442
1443         llapi_printf(LLAPI_MSG_ERROR,
1444                      "%s: mirrored file state '%s' not supported\n",
1445                      progname, string);
1446         return -EINVAL;
1447 }
1448
1449 /**
1450  * struct mirror_args - Command-line arguments for mirror(s).
1451  * @m_count:  Number of mirrors to be created with this layout.
1452  * @m_flags:  Mirror level flags, only 'prefer' is supported.
1453  * @m_layout: Mirror layout.
1454  * @m_file:   A victim file. Its layout will be split and used as a mirror.
1455  * @m_next:   Point to the next node of the list.
1456  *
1457  * Command-line arguments for mirror(s) will be parsed and stored in
1458  * a linked list that consists of this structure.
1459  */
1460 struct mirror_args {
1461         __u32                   m_count;
1462         __u32                   m_flags;
1463         struct llapi_layout     *m_layout;
1464         const char              *m_file;
1465         struct mirror_args      *m_next;
1466         bool                    m_inherit;
1467 };
1468
1469 /**
1470  * enum mirror_flags - Flags for extending a mirrored file.
1471  * @MF_NO_VERIFY: Indicates not to verify the mirror(s) from victim file(s)
1472  *             in case the victim file(s) contains the same data as the
1473  *             original mirrored file.
1474  * @MF_DESTROY: Indicates to delete the mirror from the mirrored file.
1475  * @MF_COMP_ID: specified component id instead of mirror id
1476  *
1477  * Flags for extending a mirrored file.
1478  */
1479 enum mirror_flags {
1480         MF_NO_VERIFY    = 0x1,
1481         MF_DESTROY      = 0x2,
1482         MF_COMP_ID      = 0x4,
1483         MF_COMP_POOL    = 0x8,
1484 };
1485
1486 /**
1487  * mirror_create_sanity_check() - Check mirror list.
1488  * @list:  A linked list that stores the mirror arguments.
1489  *
1490  * This function does a sanity check on @list for creating
1491  * a mirrored file.
1492  *
1493  * Return: 0 on success or a negative error code on failure.
1494  */
1495 static int mirror_create_sanity_check(const char *fname,
1496                                       struct mirror_args *list,
1497                                       bool check_fname)
1498 {
1499         int rc = 0;
1500         bool has_m_file = false;
1501         bool has_m_layout = false;
1502
1503         if (!list)
1504                 return -EINVAL;
1505
1506         if (fname && check_fname) {
1507                 struct llapi_layout *layout;
1508
1509                 layout = llapi_layout_get_by_path(fname, 0);
1510                 if (!layout) {
1511                         fprintf(stderr,
1512                                 "error: %s: file '%s' couldn't get layout\n",
1513                                 progname, fname);
1514                         return -ENODATA;
1515                 }
1516
1517                 rc = llapi_layout_sanity(layout, false, true);
1518
1519                 llapi_layout_free(layout);
1520
1521                 if (rc) {
1522                         llapi_layout_sanity_perror(rc);
1523                         return rc;
1524                 }
1525         }
1526
1527         while (list) {
1528                 if (list->m_file) {
1529                         has_m_file = true;
1530                         llapi_layout_free(list->m_layout);
1531
1532                         list->m_layout =
1533                                 llapi_layout_get_by_path(list->m_file, 0);
1534                         if (!list->m_layout) {
1535                                 fprintf(stderr,
1536                                         "error: %s: file '%s' has no layout\n",
1537                                         progname, list->m_file);
1538                                 return -ENODATA;
1539                         }
1540                 } else {
1541                         has_m_layout = true;
1542                         if (!list->m_layout) {
1543                                 fprintf(stderr, "error: %s: no mirror layout\n",
1544                                         progname);
1545                                 return -EINVAL;
1546                         }
1547                 }
1548
1549                 rc = llapi_layout_sanity(list->m_layout, false, true);
1550                 if (rc) {
1551                         llapi_layout_sanity_perror(rc);
1552                         return rc;
1553                 }
1554
1555                 list = list->m_next;
1556         }
1557
1558         if (has_m_file && has_m_layout) {
1559                 fprintf(stderr,
1560                         "error: %s: -f <victim_file> option should not be specified with setstripe options\n",
1561                         progname);
1562                 return -EINVAL;
1563         }
1564
1565         return 0;
1566 }
1567
1568 static int mirror_set_flags(struct llapi_layout *layout, void *cbdata)
1569 {
1570         __u32 mirror_flags = *(__u32 *)cbdata;
1571         uint32_t flags;
1572         int rc;
1573
1574         rc = llapi_layout_comp_flags_get(layout, &flags);
1575         if (rc < 0)
1576                 return rc;
1577
1578         if (!flags) {
1579                 rc = llapi_layout_comp_flags_set(layout, mirror_flags);
1580                 if (rc)
1581                         return rc;
1582         }
1583
1584         return LLAPI_LAYOUT_ITER_CONT;
1585 }
1586
1587 /**
1588  * mirror_create() - Create a mirrored file.
1589  * @fname:        The file to be created.
1590  * @mirror_list:  A linked list that stores the mirror arguments.
1591  *
1592  * This function creates a mirrored file @fname with the mirror(s)
1593  * from @mirror_list.
1594  *
1595  * Return: 0 on success or a negative error code on failure.
1596  */
1597 static int mirror_create(char *fname, struct mirror_args *mirror_list)
1598 {
1599         struct llapi_layout *layout = NULL;
1600         struct mirror_args *cur_mirror = NULL;
1601         uint16_t mirror_count = 0;
1602         int i = 0;
1603         int rc = 0;
1604
1605         rc = mirror_create_sanity_check(fname, mirror_list, false);
1606         if (rc)
1607                 return rc;
1608
1609         cur_mirror = mirror_list;
1610         while (cur_mirror) {
1611                 rc = llapi_layout_comp_iterate(cur_mirror->m_layout,
1612                                                mirror_set_flags,
1613                                                &cur_mirror->m_flags);
1614                 if (rc) {
1615                         rc = -errno;
1616                         fprintf(stderr, "%s: failed to set mirror flags\n",
1617                                 progname);
1618                         goto error;
1619                 }
1620
1621                 for (i = 0; i < cur_mirror->m_count; i++) {
1622                         rc = llapi_layout_merge(&layout, cur_mirror->m_layout);
1623                         if (rc) {
1624                                 rc = -errno;
1625                                 fprintf(stderr,
1626                                         "error: %s: merge layout failed: %s\n",
1627                                         progname, strerror(errno));
1628                                 goto error;
1629                         }
1630                 }
1631                 mirror_count += cur_mirror->m_count;
1632                 cur_mirror = cur_mirror->m_next;
1633         }
1634
1635         if (!layout) {
1636                 fprintf(stderr, "error: %s: layout is NULL\n", progname);
1637                 return -EINVAL;
1638         }
1639
1640         rc = llapi_layout_mirror_count_set(layout, mirror_count);
1641         if (rc) {
1642                 rc = -errno;
1643                 fprintf(stderr, "error: %s: set mirror count failed: %s\n",
1644                         progname, strerror(errno));
1645                 goto error;
1646         }
1647
1648         rc = lfs_component_create(fname, O_CREAT | O_WRONLY, 0666,
1649                                   layout);
1650         if (rc >= 0) {
1651                 close(rc);
1652                 rc = 0;
1653         }
1654
1655 error:
1656         llapi_layout_free(layout);
1657         return rc;
1658 }
1659
1660 /**
1661  * Compare files and check lease on @fd.
1662  *
1663  * \retval bytes number of bytes are the same
1664  */
1665 static ssize_t mirror_file_compare(int fd, int fdv)
1666 {
1667         const size_t buflen = 4 * 1024 * 1024; /* 4M */
1668         void *buf;
1669         ssize_t bytes_done = 0;
1670         ssize_t bytes_read = 0;
1671
1672         buf = malloc(buflen * 2);
1673         if (!buf)
1674                 return -ENOMEM;
1675
1676         while (1) {
1677                 if (!llapi_lease_check(fd)) {
1678                         bytes_done = -EBUSY;
1679                         break;
1680                 }
1681
1682                 bytes_read = read(fd, buf, buflen);
1683                 if (bytes_read <= 0)
1684                         break;
1685
1686                 if (bytes_read != read(fdv, buf + buflen, buflen))
1687                         break;
1688
1689                 /*
1690                  * XXX: should compute the checksum on each buffer and then
1691                  * compare checksum to avoid cache collision
1692                  */
1693                 if (memcmp(buf, buf + buflen, bytes_read))
1694                         break;
1695
1696                 bytes_done += bytes_read;
1697         }
1698
1699         free(buf);
1700
1701         return bytes_done;
1702 }
1703
1704 static int mirror_extend_file(const char *fname, const char *victim_file,
1705                               enum mirror_flags mirror_flags)
1706 {
1707         int fd = -1;
1708         int fdv = -1;
1709         struct stat stbuf;
1710         struct stat stbuf_v;
1711         struct ll_ioc_lease *data = NULL;
1712         int rc;
1713
1714         fd = open(fname, O_RDWR);
1715         if (fd < 0) {
1716                 error_loc = "open source file";
1717                 rc = -errno;
1718                 goto out;
1719         }
1720
1721         fdv = open(victim_file, O_RDWR);
1722         if (fdv < 0) {
1723                 error_loc = "open target file";
1724                 rc = -errno;
1725                 goto out;
1726         }
1727
1728         if (fstat(fd, &stbuf) || fstat(fdv, &stbuf_v)) {
1729                 error_loc = "stat source or target file";
1730                 rc = -errno;
1731                 goto out;
1732         }
1733
1734         if (stbuf.st_dev != stbuf_v.st_dev) {
1735                 error_loc = "stat source and target file";
1736                 rc = -EXDEV;
1737                 goto out;
1738         }
1739
1740         /* mirrors should be of the same size */
1741         if (stbuf.st_size != stbuf_v.st_size) {
1742                 error_loc = "file sizes don't match";
1743                 rc = -EINVAL;
1744                 goto out;
1745         }
1746
1747         rc = llapi_lease_acquire(fd, LL_LEASE_RDLCK);
1748         if (rc < 0) {
1749                 error_loc = "cannot get lease";
1750                 goto out;
1751         }
1752
1753         if (!(mirror_flags & MF_NO_VERIFY)) {
1754                 ssize_t ret;
1755                 /* mirrors should have the same contents */
1756                 ret = mirror_file_compare(fd, fdv);
1757                 if (ret != stbuf.st_size) {
1758                         error_loc = "file busy or contents don't match";
1759                         rc = ret < 0 ? ret : -EINVAL;
1760                         goto out;
1761                 }
1762         }
1763
1764         /* Get rid of caching pages from clients */
1765         rc = llapi_file_flush(fd);
1766         if (rc < 0) {
1767                 error_loc = "cannot get data version";
1768                 goto out;
1769         }
1770
1771         rc = llapi_file_flush(fdv);
1772         if (rc < 0) {
1773                 error_loc = "cannot get data version";
1774                 goto out;
1775         }
1776
1777         rc = migrate_set_timestamps(fd, &stbuf);
1778         if (rc < 0) {
1779                 error_loc = "cannot set source file timestamp";
1780                 goto out;
1781         }
1782
1783         /* Atomically put lease, merge layouts and close. */
1784         data = calloc(1, offsetof(typeof(*data), lil_ids[1]));
1785         if (!data) {
1786                 error_loc = "memory allocation";
1787                 goto out;
1788         }
1789         data->lil_mode = LL_LEASE_UNLCK;
1790         data->lil_flags = LL_LEASE_LAYOUT_MERGE;
1791         data->lil_count = 1;
1792         data->lil_ids[0] = fdv;
1793         rc = llapi_lease_set(fd, data);
1794         if (rc < 0) {
1795                 error_loc = "cannot merge layout";
1796                 goto out;
1797         } else if (rc == 0) {
1798                 rc = -EBUSY;
1799                 error_loc = "lost lease lock";
1800                 goto out;
1801         }
1802         rc = 0;
1803
1804 out:
1805         if (data)
1806                 free(data);
1807         if (fd >= 0)
1808                 close(fd);
1809         if (fdv >= 0)
1810                 close(fdv);
1811         if (!rc)
1812                 (void) unlink(victim_file);
1813         if (rc < 0)
1814                 fprintf(stderr, "error: %s: %s: %s: %s\n",
1815                         progname, fname, error_loc, strerror(-rc));
1816         return rc;
1817 }
1818
1819 static int mirror_extend_layout(char *name, struct llapi_layout *m_layout,
1820                                 bool inherit, uint32_t flags)
1821 {
1822         struct llapi_layout *f_layout = NULL;
1823         struct ll_ioc_lease *data = NULL;
1824         struct stat st;
1825         int fd = -1;
1826         int fdv = -1;
1827         int rc = 0;
1828
1829         if (inherit) {
1830                 f_layout = llapi_layout_get_by_path(name, 0);
1831                 if (!f_layout) {
1832                         rc = -EINVAL;
1833                         fprintf(stderr, "%s: cannot get layout\n", progname);
1834                         goto out;
1835                 }
1836                 rc = llapi_layout_get_last_init_comp(f_layout);
1837                 if (rc) {
1838                         fprintf(stderr, "%s: cannot get the last init comp\n",
1839                                 progname);
1840                         goto out;
1841                 }
1842                 rc = llapi_layout_mirror_inherit(f_layout, m_layout);
1843                 if (rc) {
1844                         fprintf(stderr,
1845                                 "%s: cannot inherit from the last init comp\n",
1846                                 progname);
1847                         goto out;
1848                 }
1849         }
1850
1851         llapi_layout_comp_flags_set(m_layout, flags);
1852         rc = migrate_open_files(name,
1853                              LLAPI_MIGRATION_NONDIRECT | LLAPI_MIGRATION_MIRROR,
1854                              NULL, m_layout, &fd, &fdv);
1855         if (rc < 0)
1856                 goto out;
1857
1858         rc = llapi_lease_acquire(fd, LL_LEASE_RDLCK);
1859         if (rc < 0) {
1860                 error_loc = "cannot get lease";
1861                 goto out;
1862         }
1863
1864         rc = fstat(fd, &st);
1865         if (rc < 0) {
1866                 error_loc = "cannot stat source file";
1867                 goto out;
1868         }
1869
1870         rc = migrate_nonblock(fd, fdv);
1871         if (rc < 0) {
1872                 llapi_lease_release(fd);
1873                 goto out;
1874         }
1875
1876         rc = migrate_set_timestamps(fd, &st);
1877         if (rc < 0) {
1878                 error_loc = "cannot set source file timestamp";
1879                 goto out;
1880         }
1881
1882         /* Atomically put lease, merge layouts and close. */
1883         data = calloc(1, offsetof(typeof(*data), lil_ids[1]));
1884         if (!data) {
1885                 error_loc = "memory allocation";
1886                 goto out;
1887         }
1888         data->lil_mode = LL_LEASE_UNLCK;
1889         data->lil_flags = LL_LEASE_LAYOUT_MERGE;
1890         data->lil_count = 1;
1891         data->lil_ids[0] = fdv;
1892         rc = llapi_lease_set(fd, data);
1893         if (rc < 0) {
1894                 error_loc = "cannot merge layout";
1895                 goto out;
1896         } else if (rc == 0) {
1897                 rc = -EBUSY;
1898                 error_loc = "lost lease lock";
1899                 goto out;
1900         }
1901         rc = 0;
1902
1903 out:
1904         if (data)
1905                 free(data);
1906         if (fd >= 0)
1907                 close(fd);
1908         if (fdv >= 0)
1909                 close(fdv);
1910         if (rc < 0)
1911                 fprintf(stderr, "error: %s: %s: %s: %s\n",
1912                         progname, name, error_loc, strerror(-rc));
1913         return rc;
1914 }
1915
1916 static int mirror_extend(char *fname, struct mirror_args *mirror_list,
1917                          enum mirror_flags mirror_flags)
1918 {
1919         int rc = 0;
1920
1921         while (mirror_list) {
1922                 if (mirror_list->m_file) {
1923                         rc = mirror_extend_file(fname, mirror_list->m_file,
1924                                                 mirror_flags);
1925                 } else {
1926                         __u32 mirror_count = mirror_list->m_count;
1927
1928                         while (mirror_count > 0) {
1929                                 rc = mirror_extend_layout(fname,
1930                                                         mirror_list->m_layout,
1931                                                         mirror_list->m_inherit,
1932                                                         mirror_list->m_flags);
1933                                 if (rc)
1934                                         break;
1935
1936                                 --mirror_count;
1937                         }
1938                 }
1939                 if (rc)
1940                         break;
1941
1942                 mirror_list = mirror_list->m_next;
1943         }
1944
1945         return rc;
1946 }
1947
1948 static int find_mirror_id(struct llapi_layout *layout, void *cbdata)
1949 {
1950         uint32_t id;
1951         int rc;
1952
1953         rc = llapi_layout_mirror_id_get(layout, &id);
1954         if (rc < 0)
1955                 return rc;
1956
1957         if ((__u16)id == *(__u16 *)cbdata)
1958                 return LLAPI_LAYOUT_ITER_STOP;
1959
1960         return LLAPI_LAYOUT_ITER_CONT;
1961 }
1962
1963 static int find_comp_id(struct llapi_layout *layout, void *cbdata)
1964 {
1965         uint32_t id;
1966         int rc;
1967
1968         rc = llapi_layout_comp_id_get(layout, &id);
1969         if (rc < 0)
1970                 return rc;
1971
1972         if (id == *(__u32 *)cbdata)
1973                 return LLAPI_LAYOUT_ITER_STOP;
1974
1975         return LLAPI_LAYOUT_ITER_CONT;
1976 }
1977
1978 static int find_mirror_id_by_pool(struct llapi_layout *layout, void *cbdata)
1979 {
1980         char buf[LOV_MAXPOOLNAME + 1];
1981         struct pool_to_id_cbdata *d = (void *)cbdata;
1982         uint32_t id;
1983         int rc;
1984
1985         rc = llapi_layout_pool_name_get(layout, buf, sizeof(buf));
1986         if (rc < 0)
1987                 return rc;
1988         if (strcmp(d->pool, buf))
1989                 return LLAPI_LAYOUT_ITER_CONT;
1990
1991         rc = llapi_layout_mirror_id_get(layout, &id);
1992         if (rc < 0)
1993                 return rc;
1994         d->id = id;
1995
1996         return LLAPI_LAYOUT_ITER_STOP;
1997 }
1998
1999 static int find_comp_id_by_pool(struct llapi_layout *layout, void *cbdata)
2000 {
2001         char buf[LOV_MAXPOOLNAME + 1];
2002         struct pool_to_id_cbdata *d = (void *)cbdata;
2003         uint32_t id;
2004         int rc;
2005
2006         rc = llapi_layout_pool_name_get(layout, buf, sizeof(buf));
2007         if (rc < 0)
2008                 return rc;
2009         if (strcmp(d->pool, buf))
2010                 return LLAPI_LAYOUT_ITER_CONT;
2011
2012         rc = llapi_layout_comp_id_get(layout, &id);
2013         if (rc < 0)
2014                 return rc;
2015         d->id = id;
2016
2017         return LLAPI_LAYOUT_ITER_STOP;
2018 }
2019
2020 struct collect_ids_data {
2021         __u16   *cid_ids;
2022         int     cid_count;
2023         __u16   cid_exclude;
2024 };
2025
2026 static int collect_mirror_id(struct llapi_layout *layout, void *cbdata)
2027 {
2028         struct collect_ids_data *cid = cbdata;
2029         uint32_t id;
2030         int rc;
2031
2032         rc = llapi_layout_mirror_id_get(layout, &id);
2033         if (rc < 0)
2034                 return rc;
2035
2036         if ((__u16)id != cid->cid_exclude) {
2037                 int i;
2038
2039                 for (i = 0; i < cid->cid_count; i++) {
2040                         /* already collected the mirror id */
2041                         if (id == cid->cid_ids[i])
2042                                 return LLAPI_LAYOUT_ITER_CONT;
2043                 }
2044                 cid->cid_ids[cid->cid_count] = id;
2045                 cid->cid_count++;
2046         }
2047
2048         return LLAPI_LAYOUT_ITER_CONT;
2049 }
2050
2051 /**
2052  * last_non_stale_mirror() - Check if a mirror is the last non-stale mirror.
2053  * @mirror_id: Mirror id to be checked.
2054  * @layout:    Mirror component list.
2055  *
2056  * This function checks if a mirror with specified @mirror_id is the last
2057  * non-stale mirror of a layout @layout.
2058  *
2059  * Return: true or false.
2060  */
2061 static inline
2062 bool last_non_stale_mirror(__u16 mirror_id, struct llapi_layout *layout)
2063 {
2064         __u16 mirror_ids[128] = { 0 };
2065         struct collect_ids_data cid = { .cid_ids = mirror_ids,
2066                                         .cid_count = 0,
2067                                         .cid_exclude = mirror_id, };
2068         int i;
2069
2070         llapi_layout_comp_iterate(layout, collect_mirror_id, &cid);
2071
2072         for (i = 0; i < cid.cid_count; i++) {
2073                 struct llapi_resync_comp comp_array[1024] = { { 0 } };
2074                 int comp_size = 0;
2075
2076                 comp_size = llapi_mirror_find_stale(layout, comp_array,
2077                                                     ARRAY_SIZE(comp_array),
2078                                                     &mirror_ids[i], 1);
2079                 if (comp_size == 0)
2080                         return false;
2081         }
2082
2083         return true;
2084 }
2085
2086 static int mirror_split(const char *fname, __u32 id, const char *pool,
2087                         enum mirror_flags mflags, const char *victim_file)
2088 {
2089         struct llapi_layout *layout;
2090         char parent[PATH_MAX];
2091         char victim[PATH_MAX];
2092         int flags = O_CREAT | O_EXCL | O_LOV_DELAY_CREATE | O_NOFOLLOW;
2093         char *ptr;
2094         struct ll_ioc_lease *data;
2095         uint16_t mirror_count;
2096         __u32 mirror_id;
2097         int mdt_index;
2098         int fd, fdv;
2099         bool purge = true; /* delete mirror by setting fdv=fd */
2100         bool is_encrypted;
2101         int rc;
2102
2103         if (victim_file && (strcmp(fname, victim_file) == 0)) {
2104                 fprintf(stderr,
2105                         "error %s: the source file '%s' and -f file are the same\n",
2106                         progname, fname);
2107                 return -EINVAL;
2108         }
2109
2110         /* check fname contains mirror with mirror_id/comp_id */
2111         layout = llapi_layout_get_by_path(fname, 0);
2112         if (!layout) {
2113                 fprintf(stderr,
2114                         "error %s: file '%s' couldn't get layout\n",
2115                         progname, fname);
2116                 return -EINVAL;
2117         }
2118
2119         rc = llapi_layout_sanity(layout, false, true);
2120         if (rc) {
2121                 llapi_layout_sanity_perror(rc);
2122                 goto free_layout;
2123         }
2124
2125         rc = llapi_layout_mirror_count_get(layout, &mirror_count);
2126         if (rc) {
2127                 fprintf(stderr,
2128                         "error %s: file '%s' couldn't get mirror count\n",
2129                         progname, fname);
2130                 goto free_layout;
2131         }
2132         if (mirror_count < 2) {
2133                 fprintf(stderr,
2134                         "error %s: file '%s' has %d component, cannot split\n",
2135                         progname, fname, mirror_count);
2136                 goto free_layout;
2137         }
2138
2139         if (mflags & MF_COMP_POOL) {
2140                 struct pool_to_id_cbdata data = { .pool = pool };
2141
2142                 rc = llapi_layout_comp_iterate(layout, find_mirror_id_by_pool,
2143                                                &data);
2144                 mirror_id = data.id;
2145         } else if (mflags & MF_COMP_ID) {
2146                 rc = llapi_layout_comp_iterate(layout, find_comp_id, &id);
2147                 mirror_id = mirror_id_of(id);
2148         } else {
2149                 rc = llapi_layout_comp_iterate(layout, find_mirror_id, &id);
2150                 mirror_id = id;
2151         }
2152         if (rc < 0) {
2153                 fprintf(stderr, "error %s: failed to iterate layout of '%s'\n",
2154                         progname, fname);
2155                 goto free_layout;
2156         } else if (rc == LLAPI_LAYOUT_ITER_CONT) {
2157                 if (mflags & MF_COMP_POOL) {
2158                         fprintf(stderr,
2159                                 "error %s: file '%s' does not contain mirror with pool '%s'\n",
2160                                 progname, fname, pool);
2161                         goto free_layout;
2162                 } else if (mflags & MF_COMP_ID) {
2163                         fprintf(stderr,
2164                                 "error %s: file '%s' does not contain mirror with comp-id %u\n",
2165                                 progname, fname, id);
2166                         goto free_layout;
2167                 } else {
2168                         fprintf(stderr,
2169                                 "error %s: file '%s' does not contain mirror with id %u\n",
2170                                 progname, fname, id);
2171                         goto free_layout;
2172                 }
2173         }
2174
2175         if (!victim_file && mflags & MF_DESTROY)
2176                 /* Allow mirror split even without the key on encrypted files,
2177                  * and in this case of a 'split -d', open file with O_DIRECT
2178                  * (no IOs will be done).
2179                  */
2180                 fd = open(fname, O_RDWR | O_DIRECT | O_FILE_ENC);
2181         else
2182                 fd = open(fname, O_RDWR);
2183
2184         if (fd < 0) {
2185                 fprintf(stderr,
2186                         "error %s: open file '%s' failed: %s\n",
2187                         progname, fname, strerror(errno));
2188                 goto free_layout;
2189         }
2190
2191         /* get victim file directory pathname */
2192         if (strlen(fname) > sizeof(parent) - 1) {
2193                 fprintf(stderr, "error %s: file name of '%s' too long\n",
2194                         progname, fname);
2195                 rc = -ERANGE;
2196                 goto close_fd;
2197         }
2198         strncpy(parent, fname, sizeof(parent));
2199         ptr = strrchr(parent, '/');
2200         if (!ptr) {
2201                 if (!getcwd(parent, sizeof(parent))) {
2202                         fprintf(stderr, "error %s: getcwd failed: %s\n",
2203                                 progname, strerror(errno));
2204                         rc = -errno;
2205                         goto close_fd;
2206                 }
2207         } else {
2208                 if (ptr == parent)
2209                         ptr = parent + 1;
2210                 *ptr = '\0';
2211         }
2212
2213         rc = llapi_file_fget_mdtidx(fd, &mdt_index);
2214         if (rc < 0) {
2215                 fprintf(stderr, "%s: cannot get MDT index of '%s'\n",
2216                         progname, fname);
2217                 goto close_fd;
2218         }
2219
2220         rc = llapi_file_is_encrypted(fd);
2221         if (rc < 0) {
2222                 fprintf(stderr, "%s: cannot get flags of '%s': %d\n",
2223                         progname, fname, rc);
2224                 goto close_fd;
2225         }
2226         is_encrypted = rc;
2227
2228 again:
2229         if (!victim_file) {
2230                 /* use a temp file to store the splitted layout */
2231                 if (mflags & MF_DESTROY) {
2232                         char file_path[PATH_MAX];
2233                         unsigned int rnumber;
2234                         int open_flags;
2235
2236                         if (last_non_stale_mirror(mirror_id, layout)) {
2237                                 rc = -EUCLEAN;
2238                                 fprintf(stderr,
2239                                         "%s: cannot destroy the last non-stale mirror of file '%s'\n",
2240                                         progname, fname);
2241                                 goto close_fd;
2242                         }
2243
2244                         if (purge) {
2245                                 /* don't use volatile file for mirror destroy */
2246                                 fdv = fd;
2247                         } else {
2248                                 /**
2249                                  * try the old way to delete mirror using
2250                                  * volatile file.
2251                                  */
2252                                 do {
2253                                         rnumber = random();
2254                                         rc = snprintf(file_path,
2255                                                       sizeof(file_path),
2256                                                       "%s/" LUSTRE_VOLATILE_HDR ":%.4X:%.4X:fd=%.2d",
2257                                                       parent, mdt_index,
2258                                                       rnumber, fd);
2259                                         if (rc < 0 ||
2260                                             rc >= sizeof(file_path)) {
2261                                                 fdv = -ENAMETOOLONG;
2262                                                 break;
2263                                         }
2264
2265                                         open_flags = O_RDWR |
2266                                              (O_LOV_DELAY_CREATE & ~O_ACCMODE) |
2267                                              O_CREAT | O_EXCL | O_NOFOLLOW |
2268                                              /* O_DIRECT for mirror split -d */
2269                                              O_DIRECT |
2270                                              /* Allow split without the key */
2271                                              O_FILE_ENC;
2272                                         fdv = open(file_path, open_flags,
2273                                                    S_IRUSR | S_IWUSR);
2274                                         if (fdv < 0)
2275                                                 rc = -errno;
2276                                 } while (fdv < 0 && rc == -EEXIST);
2277                         }
2278                 } else {
2279                         if (is_encrypted) {
2280                                 rc = -1;
2281                                 fprintf(stderr,
2282                                         "error %s: not permitted on encrypted file '%s': %d\n",
2283                                         progname, fname, rc);
2284                                 goto close_fd;
2285                         }
2286
2287                         snprintf(victim, sizeof(victim), "%s.mirror~%u",
2288                                  fname, mirror_id);
2289                         fdv = open(victim, flags, S_IRUSR | S_IWUSR);
2290                 }
2291         } else {
2292                 /* user specified victim file */
2293                 if (is_encrypted) {
2294                         rc = -1;
2295                         fprintf(stderr,
2296                                 "error %s: not permitted on encrypted file '%s': %d\n",
2297                                 progname, fname, rc);
2298                         goto close_fd;
2299                 }
2300                 fdv = open(victim_file, flags, S_IRUSR | S_IWUSR);
2301         }
2302
2303         if (fdv < 0) {
2304                 fprintf(stderr,
2305                         "error %s: create victim file failed: %s\n",
2306                         progname, strerror(errno));
2307                 goto close_fd;
2308         }
2309
2310         /* get lease lock of fname */
2311         rc = llapi_lease_acquire(fd, LL_LEASE_WRLCK);
2312         if (rc < 0) {
2313                 fprintf(stderr,
2314                         "error %s: cannot get lease of file '%s': %d\n",
2315                         progname, fname, rc);
2316                 goto close_victim;
2317         }
2318
2319         /* Atomatically put lease, split layouts and close. */
2320         data = malloc(offsetof(typeof(*data), lil_ids[2]));
2321         if (!data) {
2322                 rc = -ENOMEM;
2323                 goto close_victim;
2324         }
2325
2326         data->lil_mode = LL_LEASE_UNLCK;
2327         data->lil_flags = LL_LEASE_LAYOUT_SPLIT;
2328         data->lil_count = 2;
2329         data->lil_ids[0] = fdv;
2330         data->lil_ids[1] = mirror_id;
2331         rc = llapi_lease_set(fd, data);
2332         if (rc <= 0) {
2333                 if ((rc == -EINVAL || rc == -EBUSY) && purge) {
2334                         /* could be old MDS which prohibit fd==fdv */
2335                         purge = false;
2336                         goto again;
2337
2338                 }
2339                 if (rc == 0) /* lost lease lock */
2340                         rc = -EBUSY;
2341                 fprintf(stderr,
2342                         "error %s: cannot split '%s': %s\n",
2343                         progname, fname, strerror(-rc));
2344         } else {
2345                 rc = 0;
2346         }
2347         free(data);
2348
2349 close_victim:
2350         if (!purge)
2351                 close(fdv);
2352 close_fd:
2353         close(fd);
2354 free_layout:
2355         llapi_layout_free(layout);
2356         return rc;
2357 }
2358
2359 static inline
2360 int lfs_mirror_resync_file(const char *fname, struct ll_ioc_lease *ioc,
2361                            __u16 *mirror_ids, int ids_nr);
2362
2363 static int lfs_migrate_to_dom(int fd, int fdv, char *name,
2364                               __u64 migration_flags)
2365 {
2366         struct ll_ioc_lease *data = NULL;
2367         int rc;
2368
2369         rc = llapi_lease_acquire(fd, LL_LEASE_RDLCK);
2370         if (rc < 0) {
2371                 error_loc = "cannot get lease";
2372                 goto out_close;
2373         }
2374
2375         rc = migrate_nonblock(fd, fdv);
2376         if (rc < 0)
2377                 goto out_release;
2378
2379         /* Atomically put lease, merge layouts, resync and close. */
2380         data = calloc(1, offsetof(typeof(*data), lil_ids[1]));
2381         if (!data) {
2382                 error_loc = "memory allocation";
2383                 goto out_release;
2384         }
2385         data->lil_mode = LL_LEASE_UNLCK;
2386         data->lil_flags = LL_LEASE_LAYOUT_MERGE;
2387         data->lil_count = 1;
2388         data->lil_ids[0] = fdv;
2389         rc = llapi_lease_set(fd, data);
2390         if (rc < 0) {
2391                 error_loc = "cannot merge layout";
2392                 goto out_close;
2393         } else if (rc == 0) {
2394                 rc = -EBUSY;
2395                 error_loc = "lost lease lock";
2396                 goto out_close;
2397         }
2398         close(fd);
2399         close(fdv);
2400
2401         rc = lfs_mirror_resync_file(name, data, NULL, 0);
2402         if (rc) {
2403                 error_loc = "cannot resync file";
2404                 goto out;
2405         }
2406
2407         /* delete first mirror now */
2408         rc = mirror_split(name, 1, NULL, MF_DESTROY, NULL);
2409         if (rc < 0)
2410                 error_loc = "cannot delete old layout";
2411         goto out;
2412
2413 out_release:
2414         llapi_lease_release(fd);
2415 out_close:
2416         close(fd);
2417         close(fdv);
2418 out:
2419         if (rc < 0)
2420                 fprintf(stderr, "error: %s: %s: %s: %s\n",
2421                         progname, name, error_loc, strerror(-rc));
2422         else if (migration_flags & LLAPI_MIGRATION_VERBOSE)
2423                 printf("%s\n", name);
2424         if (data)
2425                 free(data);
2426         return rc;
2427 }
2428
2429 /**
2430  * Parse a string containing an target index list into an array of integers.
2431  *
2432  * The input string contains a comma delimited list of individual
2433  * indices and ranges, for example "1,2-4,7". Add the indices into the
2434  * \a tgts array and remove duplicates.
2435  *
2436  * \param[out] tgts             array to store indices in
2437  * \param[in] size              size of \a tgts array
2438  * \param[in] offset            starting index in \a tgts
2439  * \param[in] arg               string containing OST index list
2440  * \param[in/out] overstriping  index list may contain duplicates
2441  *
2442  * \retval positive    number of indices in \a tgts
2443  * \retval -EINVAL     unable to parse \a arg
2444  */
2445 static int parse_targets(__u32 *tgts, int size, int offset, char *arg,
2446                          unsigned long long *pattern)
2447 {
2448         int rc;
2449         int nr = offset;
2450         int slots = size - offset;
2451         char *ptr = NULL;
2452         bool overstriped = false;
2453         bool end_of_loop;
2454
2455         if (!arg)
2456                 return -EINVAL;
2457
2458         end_of_loop = false;
2459         while (!end_of_loop) {
2460                 int start_index = 0;
2461                 int end_index = 0;
2462                 int i;
2463                 char *endptr = NULL;
2464
2465                 rc = -EINVAL;
2466
2467                 ptr = strchrnul(arg, ',');
2468
2469                 end_of_loop = *ptr == '\0';
2470                 *ptr = '\0';
2471
2472                 errno = 0;
2473                 start_index = strtol(arg, &endptr, 0);
2474                 if (endptr == arg) /* no data at all */
2475                         break;
2476                 if (errno != 0 || start_index < -1 ||
2477                     (*endptr != '-' && *endptr != '\0'))
2478                         break;
2479
2480                 end_index = start_index;
2481                 if (*endptr == '-') {
2482                         errno = 0;
2483                         end_index = strtol(endptr + 1, &endptr, 0);
2484                         if (errno != 0 || *endptr != '\0' || end_index < -1)
2485                                 break;
2486                         if (end_index < start_index)
2487                                 break;
2488                 }
2489
2490                 for (i = start_index; i <= end_index && slots > 0; i++) {
2491                         int j;
2492
2493                         /* remove duplicate */
2494                         for (j = 0; j < offset; j++) {
2495                                 if (tgts[j] == i && pattern &&
2496                                     *pattern == LLAPI_LAYOUT_OVERSTRIPING)
2497                                         overstriped = true;
2498                                 else if (tgts[j] == i)
2499                                         return -EINVAL;
2500                         }
2501
2502                         j = offset;
2503
2504                         if (j == offset) { /* check complete */
2505                                 tgts[nr++] = i;
2506                                 --slots;
2507                         }
2508                 }
2509
2510                 if (slots == 0 && i < end_index)
2511                         break;
2512
2513                 *ptr = ',';
2514                 arg = ++ptr;
2515                 offset = nr;
2516                 rc = 0;
2517         }
2518         if (!end_of_loop && ptr)
2519                 *ptr = ',';
2520
2521         if (!overstriped && pattern)
2522                 *pattern = LLAPI_LAYOUT_DEFAULT;
2523
2524         return rc < 0 ? rc : nr;
2525 }
2526
2527 struct lfs_setstripe_args {
2528         unsigned long long       lsa_comp_end;
2529         unsigned long long       lsa_stripe_size;
2530         unsigned long long       lsa_extension_size;
2531         long long                lsa_stripe_count;
2532         long long                lsa_stripe_off;
2533         __u32                    lsa_comp_flags;
2534         __u32                    lsa_comp_neg_flags;
2535         unsigned long long       lsa_pattern;
2536         unsigned int             lsa_mirror_count;
2537         int                      lsa_nr_tgts;
2538         bool                     lsa_first_comp;
2539         bool                     lsa_extension_comp;
2540         __u32                   *lsa_tgts;
2541         char                    *lsa_pool_name;
2542 };
2543
2544 static inline void setstripe_args_init(struct lfs_setstripe_args *lsa)
2545 {
2546         unsigned int mirror_count = lsa->lsa_mirror_count;
2547         bool first_comp = lsa->lsa_first_comp;
2548
2549         memset(lsa, 0, sizeof(*lsa));
2550
2551         lsa->lsa_stripe_size = LLAPI_LAYOUT_DEFAULT;
2552         lsa->lsa_stripe_count = LLAPI_LAYOUT_DEFAULT;
2553         lsa->lsa_stripe_off = LLAPI_LAYOUT_DEFAULT;
2554         lsa->lsa_pattern = LLAPI_LAYOUT_RAID0;
2555         lsa->lsa_pool_name = NULL;
2556
2557         lsa->lsa_mirror_count = mirror_count;
2558         lsa->lsa_first_comp = first_comp;
2559 }
2560
2561 /**
2562  * setstripe_args_init_inherit() - Initialize and inherit stripe options.
2563  * @lsa: Stripe options to be initialized and inherited.
2564  *
2565  * This function initializes stripe options in @lsa and inherit
2566  * stripe_size, stripe_count and OST pool_name options.
2567  *
2568  * Return: void.
2569  */
2570 static inline void setstripe_args_init_inherit(struct lfs_setstripe_args *lsa)
2571 {
2572         unsigned long long stripe_size;
2573         long long stripe_count;
2574         char *pool_name = NULL;
2575
2576         stripe_size = lsa->lsa_stripe_size;
2577         stripe_count = lsa->lsa_stripe_count;
2578         pool_name = lsa->lsa_pool_name;
2579
2580         setstripe_args_init(lsa);
2581
2582         lsa->lsa_stripe_size = stripe_size;
2583         lsa->lsa_stripe_count = stripe_count;
2584         lsa->lsa_pool_name = pool_name;
2585 }
2586
2587 static inline bool setstripe_args_specified(struct lfs_setstripe_args *lsa)
2588 {
2589         return (lsa->lsa_stripe_size != LLAPI_LAYOUT_DEFAULT ||
2590                 lsa->lsa_stripe_count != LLAPI_LAYOUT_DEFAULT ||
2591                 lsa->lsa_stripe_off != LLAPI_LAYOUT_DEFAULT ||
2592                 lsa->lsa_pattern != LLAPI_LAYOUT_RAID0 ||
2593                 lsa->lsa_comp_end != 0);
2594 }
2595
2596 static int lsa_args_stripe_count_check(struct lfs_setstripe_args *lsa)
2597 {
2598         if (lsa->lsa_nr_tgts) {
2599                 if (lsa->lsa_nr_tgts < 0 ||
2600                     lsa->lsa_nr_tgts >= LOV_MAX_STRIPE_COUNT) {
2601                         fprintf(stderr, "Invalid nr_tgts(%d)\n",
2602                                 lsa->lsa_nr_tgts);
2603                         errno = EINVAL;
2604                         return -1;
2605                 }
2606
2607                 if (lsa->lsa_stripe_count > 0 &&
2608                     lsa->lsa_stripe_count != LLAPI_LAYOUT_DEFAULT &&
2609                     lsa->lsa_stripe_count != LLAPI_LAYOUT_WIDE &&
2610                     lsa->lsa_nr_tgts != lsa->lsa_stripe_count) {
2611                         fprintf(stderr, "stripe_count(%lld) != nr_tgts(%d)\n",
2612                                 lsa->lsa_stripe_count,
2613                                 lsa->lsa_nr_tgts);
2614                         errno = EINVAL;
2615                         return -1;
2616                 }
2617         }
2618
2619         return 0;
2620
2621 }
2622
2623 /**
2624  * comp_args_to_layout() - Create or extend a composite layout.
2625  * @composite:       Pointer to the composite layout.
2626  * @lsa:             Stripe options for the new component.
2627  *
2628  * This function creates or extends a composite layout by adding a new
2629  * component with stripe options from @lsa.
2630  *
2631  * When modified, adjust llapi_stripe_param_verify() if needed as well.
2632  *
2633  * Return: 0 on success or an error code on failure.
2634  */
2635 static int comp_args_to_layout(struct llapi_layout **composite,
2636                                struct lfs_setstripe_args *lsa,
2637                                bool set_extent)
2638 {
2639         struct llapi_layout *layout = *composite;
2640         uint64_t prev_end = 0;
2641         uint64_t size;
2642         int i = 0, rc;
2643
2644 new_comp:
2645         if (!layout) {
2646                 layout = llapi_layout_alloc();
2647                 if (!layout) {
2648                         fprintf(stderr, "Alloc llapi_layout failed. %s\n",
2649                                 strerror(errno));
2650                         errno = ENOMEM;
2651                         return -1;
2652                 }
2653                 *composite = layout;
2654                 lsa->lsa_first_comp = true;
2655         } else {
2656                 uint64_t start;
2657
2658                 /*
2659                  * Get current component extent, current component
2660                  * must be the tail component.
2661                  */
2662                 rc = llapi_layout_comp_extent_get(layout, &start, &prev_end);
2663                 if (rc) {
2664                         fprintf(stderr, "Get comp extent failed. %s\n",
2665                                 strerror(errno));
2666                         return rc;
2667                 }
2668
2669                 if (lsa->lsa_first_comp) {
2670                         prev_end = 0;
2671                         rc = llapi_layout_add_first_comp(layout);
2672                 } else {
2673                         rc = llapi_layout_comp_add(layout);
2674                 }
2675                 if (rc) {
2676                         fprintf(stderr, "Add component failed. %s\n",
2677                                 strerror(errno));
2678                         return rc;
2679                 }
2680         }
2681
2682         rc = llapi_layout_comp_flags_set(layout, lsa->lsa_comp_flags);
2683         if (rc) {
2684                 fprintf(stderr, "Set flags 0x%x failed: %s\n",
2685                         lsa->lsa_comp_flags, strerror(errno));
2686                 return rc;
2687         }
2688
2689         if (set_extent) {
2690                 uint64_t comp_end = lsa->lsa_comp_end;
2691
2692                 /*
2693                  * The extendable component is 0-length, so it can be removed
2694                  * if there is insufficient space to extend it.
2695                  */
2696                 if (lsa->lsa_extension_comp)
2697                         comp_end = prev_end;
2698
2699                 rc = llapi_layout_comp_extent_set(layout, prev_end,
2700                                                   comp_end);
2701                 if (rc) {
2702                         fprintf(stderr, "Set extent [%lu, %lu) failed. %s\n",
2703                                 prev_end, comp_end, strerror(errno));
2704                         return rc;
2705                 }
2706         }
2707         /* reset lsa_first_comp */
2708         lsa->lsa_first_comp = false;
2709
2710         /* Data-on-MDT component setting */
2711         if (lsa->lsa_pattern == LLAPI_LAYOUT_MDT) {
2712                 /* Yaml support */
2713                 if (lsa->lsa_stripe_count == 0)
2714                         lsa->lsa_stripe_count = LLAPI_LAYOUT_DEFAULT;
2715                 if (lsa->lsa_stripe_size == lsa->lsa_comp_end)
2716                         lsa->lsa_stripe_size = LLAPI_LAYOUT_DEFAULT;
2717                 if (lsa->lsa_stripe_off == -1 ||
2718                     lsa->lsa_stripe_off == 0)
2719                         lsa->lsa_stripe_off = LLAPI_LAYOUT_DEFAULT;
2720                 /*
2721                  * In case of Data-on-MDT patterns the only extra option
2722                  * applicable is stripe size option.
2723                  */
2724                 if (lsa->lsa_stripe_count != LLAPI_LAYOUT_DEFAULT) {
2725                         fprintf(stderr,
2726                                 "Option 'stripe-count' can't be specified with Data-on-MDT component: %lld\n",
2727                                 lsa->lsa_stripe_count);
2728                         errno = EINVAL;
2729                         return -1;
2730                 }
2731                 if (lsa->lsa_stripe_size != LLAPI_LAYOUT_DEFAULT &&
2732                     lsa->lsa_stripe_size != lsa->lsa_comp_end - prev_end) {
2733                         fprintf(stderr,
2734                                 "Option 'stripe-size' can't be specified with Data-on-MDT component: %llu\n",
2735                                 lsa->lsa_stripe_size);
2736                         errno = EINVAL;
2737                         return -1;
2738                 }
2739                 if (lsa->lsa_nr_tgts != 0) {
2740                         fprintf(stderr,
2741                                 "Option 'ost-list' can't be specified with Data-on-MDT component: '%i'\n",
2742                                 lsa->lsa_nr_tgts);
2743                         errno = EINVAL;
2744                         return -1;
2745                 }
2746                 if (lsa->lsa_stripe_off != LLAPI_LAYOUT_DEFAULT) {
2747                         fprintf(stderr,
2748                                 "Option 'stripe-offset' can't be specified with Data-on-MDT component: %lld\n",
2749                                 lsa->lsa_stripe_off);
2750                         errno = EINVAL;
2751                         return -1;
2752                 }
2753                 if (lsa->lsa_pool_name != 0) {
2754                         fprintf(stderr,
2755                                 "Option 'pool' can't be specified with Data-on-MDT component: '%s'\n",
2756                                 lsa->lsa_pool_name);
2757                         errno = EINVAL;
2758                         return -1;
2759                 }
2760
2761                 rc = llapi_layout_pattern_set(layout, lsa->lsa_pattern);
2762                 if (rc) {
2763                         fprintf(stderr, "Set stripe pattern %#llx failed. %s\n",
2764                                 lsa->lsa_pattern,
2765                                 strerror(errno));
2766                         return rc;
2767                 }
2768                 /* Data-on-MDT component has always single stripe up to end */
2769                 lsa->lsa_stripe_size = lsa->lsa_comp_end;
2770         } else if (lsa->lsa_pattern == LLAPI_LAYOUT_OVERSTRIPING) {
2771                 rc = llapi_layout_pattern_set(layout, lsa->lsa_pattern);
2772                 if (rc) {
2773                         fprintf(stderr, "Set stripe pattern %#llx failed. %s\n",
2774                                 lsa->lsa_pattern,
2775                                 strerror(errno));
2776                         return rc;
2777                 }
2778         }
2779
2780         size = lsa->lsa_comp_flags & LCME_FL_EXTENSION ?
2781                 lsa->lsa_extension_size : lsa->lsa_stripe_size;
2782
2783         if (lsa->lsa_comp_flags & LCME_FL_EXTENSION)
2784                 rc = llapi_layout_extension_size_set(layout, size);
2785         else
2786                 rc = llapi_layout_stripe_size_set(layout, size);
2787
2788         if (rc) {
2789                 fprintf(stderr, "Set stripe size %lu failed: %s\n",
2790                         size, strerror(errno));
2791                 return rc;
2792         }
2793
2794         rc = llapi_layout_stripe_count_set(layout, lsa->lsa_stripe_count);
2795         if (rc) {
2796                 fprintf(stderr, "Set stripe count %lld failed: %s\n",
2797                         lsa->lsa_stripe_count, strerror(errno));
2798                 return rc;
2799         }
2800
2801         if (lsa->lsa_pool_name) {
2802                 rc = llapi_layout_pool_name_set(layout, lsa->lsa_pool_name);
2803                 if (rc) {
2804                         fprintf(stderr, "Set pool name: %s failed. %s\n",
2805                                 lsa->lsa_pool_name, strerror(errno));
2806                         return rc;
2807                 }
2808         } else {
2809                 rc = llapi_layout_pool_name_set(layout, "");
2810                 if (rc) {
2811                         fprintf(stderr, "Clear pool name failed: %s\n",
2812                                 strerror(errno));
2813                         return rc;
2814                 }
2815         }
2816
2817         rc = lsa_args_stripe_count_check(lsa);
2818         if (rc)
2819                 return rc;
2820
2821         if (lsa->lsa_nr_tgts > 0) {
2822                 bool found = false;
2823
2824                 for (i = 0; i < lsa->lsa_nr_tgts; i++) {
2825                         rc = llapi_layout_ost_index_set(layout, i,
2826                                                         lsa->lsa_tgts[i]);
2827                         if (rc)
2828                                 break;
2829
2830                         /* Make sure stripe offset is in OST list. */
2831                         if (lsa->lsa_tgts[i] == lsa->lsa_stripe_off)
2832                                 found = true;
2833                 }
2834                 if (!found) {
2835                         fprintf(stderr, "Invalid stripe offset '%lld', not in the target list",
2836                                 lsa->lsa_stripe_off);
2837                         errno = EINVAL;
2838                         return -1;
2839                 }
2840         } else if (lsa->lsa_stripe_off != LLAPI_LAYOUT_DEFAULT &&
2841                    lsa->lsa_stripe_off != -1) {
2842                 rc = llapi_layout_ost_index_set(layout, 0, lsa->lsa_stripe_off);
2843         }
2844         if (rc) {
2845                 fprintf(stderr, "Set ost index %d failed. %s\n",
2846                         i, strerror(errno));
2847                 return rc;
2848         }
2849
2850         /* Create the second, virtual component of extension space */
2851         if (lsa->lsa_extension_comp) {
2852                 lsa->lsa_comp_flags |= LCME_FL_EXTENSION;
2853                 lsa->lsa_extension_comp = false;
2854                 goto new_comp;
2855         }
2856
2857         return rc;
2858 }
2859
2860 static int build_component(struct llapi_layout **layout,
2861                            struct lfs_setstripe_args *lsa, bool set_extent)
2862 {
2863         int rc;
2864
2865         rc = comp_args_to_layout(layout, lsa, set_extent);
2866         if (rc)
2867                 return rc;
2868
2869         if (lsa->lsa_mirror_count > 0) {
2870                 rc = llapi_layout_mirror_count_set(*layout,
2871                                                    lsa->lsa_mirror_count);
2872                 if (rc)
2873                         return rc;
2874
2875                 rc = llapi_layout_flags_set(*layout, LCM_FL_RDONLY);
2876                 if (rc)
2877                         return rc;
2878                 lsa->lsa_mirror_count = 0;
2879         }
2880
2881         return rc;
2882 }
2883
2884 static int build_prev_component(struct llapi_layout **layout,
2885                                 struct lfs_setstripe_args *prev,
2886                                 struct lfs_setstripe_args *lsa,
2887                                 bool set_extent)
2888 {
2889         int extension = lsa->lsa_comp_flags & LCME_FL_EXTENSION;
2890         int rc;
2891
2892         if (prev->lsa_stripe_size) {
2893                 if (extension) {
2894                         prev->lsa_comp_end = lsa->lsa_comp_end;
2895                         prev->lsa_extension_size = lsa->lsa_extension_size;
2896                         prev->lsa_extension_comp = true;
2897                 }
2898
2899                 rc = build_component(layout, prev, true);
2900                 if (rc)
2901                         return rc;
2902         }
2903
2904         /*
2905          * Copy lsa to previous lsa;
2906          * if this is an extension component, make the previous invalid;
2907          */
2908         if (extension)
2909                 prev->lsa_stripe_size = 0;
2910         else
2911                 *prev = *lsa;
2912
2913         return 0;
2914 }
2915
2916 #ifndef LCME_TEMPLATE_FLAGS
2917 #define LCME_TEMPLATE_FLAGS     (LCME_FL_PREF_RW | LCME_FL_NOSYNC | \
2918                                  LCME_FL_EXTENSION)
2919 #endif
2920
2921 static int build_layout_from_yaml_node(struct cYAML *node,
2922                                        struct llapi_layout **layout,
2923                                        struct lfs_setstripe_args *lsa,
2924                                        struct lfs_setstripe_args *prevp)
2925 {
2926         struct lfs_setstripe_args prev = { 0 };
2927         __u32 *osts = lsa->lsa_tgts;
2928         char *string;
2929         int rc = 0;
2930
2931         if (!prevp)
2932                 prevp = &prev;
2933
2934         while (node) {
2935                 string = node->cy_string;
2936
2937                 if (node->cy_type == CYAML_TYPE_OBJECT) {
2938                         /* go deep to sub blocks */
2939                         if (string && !strncmp(string, "component", 9) &&
2940                             strncmp(string, "component0", 10) &&
2941                             strncmp(string, "components", 10)) {
2942                                 rc = build_prev_component(layout, prevp, lsa,
2943                                                           true);
2944                                 if (rc)
2945                                         return rc;
2946
2947                                 /* initialize lsa. */
2948                                 setstripe_args_init(lsa);
2949                                 lsa->lsa_first_comp = false;
2950                                 lsa->lsa_tgts = osts;
2951                         }
2952
2953                         rc = build_layout_from_yaml_node(node->cy_child, layout,
2954                                                          lsa, prevp);
2955                         if (rc)
2956                                 return rc;
2957                 } else {
2958                         if (!node->cy_string)
2959                                 return -EINVAL;
2960
2961                         /* skip leading lmm_ if present, to simplify parsing */
2962                         if (strncmp(string, "lmm_", 4) == 0)
2963                                 string += 4;
2964
2965                         if (node->cy_type == CYAML_TYPE_STRING) {
2966                                 if (!strcmp(string, "lcme_extent.e_end")) {
2967                                         if (!strcmp(node->cy_valuestring, "EOF") ||
2968                                             !strcmp(node->cy_valuestring, "eof"))
2969                                                 lsa->lsa_comp_end = LUSTRE_EOF;
2970                                 } else if (!strcmp(string, "pool")) {
2971                                         lsa->lsa_pool_name = node->cy_valuestring;
2972                                 } else if (!strcmp(string, "pattern")) {
2973                                         if (!strcmp(node->cy_valuestring, "mdt"))
2974                                                 lsa->lsa_pattern = LLAPI_LAYOUT_MDT;
2975                                         if (!strcmp(node->cy_valuestring,
2976                                                     "raid0,overstriped"))
2977                                                 lsa->lsa_pattern =
2978                                                         LLAPI_LAYOUT_OVERSTRIPING;
2979                                 } else if (!strcmp(string, "lcme_flags")) {
2980                                         rc = comp_str2flags(node->cy_valuestring,
2981                                                             &lsa->lsa_comp_flags,
2982                                                             &lsa->lsa_comp_neg_flags);
2983                                         if (rc)
2984                                                 return rc;
2985                                         /*
2986                                          * Only template flags have meaning in
2987                                          * the layout for a new file
2988                                          */
2989                                         lsa->lsa_comp_flags &= LCME_TEMPLATE_FLAGS;
2990                                 }
2991                         } else if (node->cy_type == CYAML_TYPE_NUMBER) {
2992                                 if (!strcmp(string, "lcm_mirror_count")) {
2993                                         lsa->lsa_mirror_count = node->cy_valueint;
2994                                 } else if (!strcmp(string, "lcme_extent.e_start")) {
2995                                         if (node->cy_valueint == 0)
2996                                                 lsa->lsa_first_comp = true;
2997                                 } else if (!strcmp(string, "lcme_extent.e_end")) {
2998                                         if (node->cy_valueint == -1)
2999                                                 lsa->lsa_comp_end = LUSTRE_EOF;
3000                                         else
3001                                                 lsa->lsa_comp_end = node->cy_valueint;
3002                                 } else if (!strcmp(string, "stripe_count")) {
3003                                         lsa->lsa_stripe_count = node->cy_valueint;
3004                                 } else if (!strcmp(string, "stripe_size")) {
3005                                         lsa->lsa_stripe_size = node->cy_valueint;
3006                                 } else if (!strcmp(string, "extension_size")) {
3007                                         lsa->lsa_extension_size = node->cy_valueint;
3008                                         lsa->lsa_extension_comp = true;
3009                                 } else if (!strcmp(string, "stripe_offset")) {
3010                                         lsa->lsa_stripe_off = node->cy_valueint;
3011                                 } else if (!strcmp(string, "l_ost_idx")) {
3012                                         osts[lsa->lsa_nr_tgts] = node->cy_valueint;
3013                                         lsa->lsa_nr_tgts++;
3014                                 }
3015                         }
3016                 }
3017                 node = node->cy_next;
3018         }
3019
3020         if (prevp == &prev) {
3021                 rc = build_prev_component(layout, prevp, lsa, true);
3022                 if (rc)
3023                         return rc;
3024
3025                 if (!(lsa->lsa_comp_flags & LCME_FL_EXTENSION))
3026                         rc = build_component(layout, lsa, *layout != NULL);
3027         }
3028
3029         return rc;
3030 }
3031
3032 static int lfs_comp_create_from_yaml(char *template,
3033                                      struct llapi_layout **layout,
3034                                      struct lfs_setstripe_args *lsa,
3035                                      __u32 *osts)
3036 {
3037         struct cYAML *tree = NULL, *err_rc = NULL;
3038         int rc = 0;
3039
3040         tree = cYAML_build_tree(template, NULL, 0, &err_rc, false);
3041         if (!tree) {
3042                 fprintf(stderr, "%s: cannot parse YAML file %s\n",
3043                         progname, template);
3044                 cYAML_build_error(-EINVAL, -1, "yaml", "from comp yaml",
3045                                   "can't parse", &err_rc);
3046                 cYAML_print_tree2file(stderr, err_rc);
3047                 cYAML_free_tree(err_rc);
3048                 rc = -EINVAL;
3049                 goto err;
3050         }
3051
3052         /* initialize lsa for plain file */
3053         setstripe_args_init(lsa);
3054         lsa->lsa_tgts = osts;
3055
3056         rc = build_layout_from_yaml_node(tree, layout, lsa, NULL);
3057         if (rc) {
3058                 fprintf(stderr, "%s: cannot build layout from YAML file %s.\n",
3059                         progname, template);
3060                 goto err;
3061         }
3062         /* clean clean lsa */
3063         setstripe_args_init(lsa);
3064
3065 err:
3066         if (tree)
3067                 cYAML_free_tree(tree);
3068         return rc;
3069 }
3070
3071 /**
3072  * Get the extension size from the next (SEL) component and extend the
3073  * current component on it. The start of the next component is to be
3074  * adjusted as well.
3075  *
3076  * \param[in] layout    the current layout
3077  * \param[in] start     the start of the current component
3078  * \param[in,out] end   the end of the current component
3079  * \param[in] offset    the offset to adjust the end position to instead of
3080  *                      extension size
3081  *
3082  * \retval 0            - extended successfully
3083  * \retval < 0          - error
3084  */
3085 static int layout_extend_comp(struct llapi_layout *layout,
3086                               uint64_t start, uint64_t *end,
3087                               uint64_t offset)
3088 {
3089         uint64_t size, next_start, next_end;
3090         int rc;
3091
3092         rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_NEXT);
3093         if (rc < 0) {
3094                 fprintf(stderr,
3095                         "%s setstripe: cannot move component cursor: %s\n",
3096                         progname, strerror(errno));
3097                 return rc;
3098         }
3099
3100         /*
3101          * Even if the @size will not be used below, this will fail if
3102          * this is not a SEL component - a good confirmation we are
3103          * working on right components.
3104          */
3105         rc = llapi_layout_extension_size_get(layout, &size);
3106         if (rc < 0) {
3107                 fprintf(stderr,
3108                         "%s setstripe: cannot get component ext size: %s\n",
3109                         progname, strerror(errno));
3110                 return rc;
3111         }
3112
3113         rc = llapi_layout_comp_extent_get(layout, &next_start, &next_end);
3114         if (rc) {
3115                 fprintf(stderr, "%s setstripe: cannot get extent: %s\n",
3116                         progname, strerror(errno));
3117                 return rc;
3118         }
3119
3120         next_start += offset ?: size;
3121         rc = llapi_layout_comp_extent_set(layout, next_start, next_end);
3122         if (rc) {
3123                 fprintf(stderr, "%s setstripe: cannot set extent: %s\n",
3124                         progname, strerror(errno));
3125                 return rc;
3126         }
3127
3128         rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_PREV);
3129         if (rc < 0) {
3130                 fprintf(stderr,
3131                         "%s setstripe: cannot move component cursor: %s\n",
3132                         progname, strerror(errno));
3133                 return rc;
3134         }
3135
3136         *end += offset ?: size;
3137         rc = llapi_layout_comp_extent_set(layout, start, *end);
3138         if (rc) {
3139                 fprintf(stderr, "%s setstripe: cannot set extent: %s\n",
3140                         progname, strerror(errno));
3141                 return rc;
3142         }
3143
3144         return 0;
3145 }
3146
3147 /**
3148  * In 'lfs setstripe --component-add' mode, we need to fetch the extent
3149  * end of the last component in the existing file, and adjust the
3150  * first extent start of the components to be added accordingly.
3151  *
3152  * In the create mode, we need to check if the first component is an extendable
3153  * SEL component and extend its length to the extension size (first component
3154  * of the PFL file is initialised at the create time, cannot be 0-lenght.
3155  */
3156 static int layout_adjust_first_extent(char *fname, struct llapi_layout *layout,
3157                                       bool comp_add)
3158 {
3159         struct llapi_layout *head;
3160         uint64_t start = 0, prev_end = 0;
3161         uint64_t end;
3162         int rc, ret = 0;
3163
3164         if (!layout || !(comp_add || llapi_layout_is_composite(layout)))
3165                 return 0;
3166
3167         errno = 0;
3168         while (comp_add) {
3169                 head = llapi_layout_get_by_path(fname, 0);
3170                 if (!head) {
3171                         fprintf(stderr,
3172         &nbs