summaryrefslogtreecommitdiffstats
path: root/libglusterfs/src/common-utils.h
blob: 4fd92b0315bcc73db0971ebf98b5be636472ccd9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/

#ifndef _COMMON_UTILS_H
#define _COMMON_UTILS_H

#include <stdint.h>
#include <sys/uio.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <pthread.h>
#include <openssl/md5.h>
#ifndef GF_BSD_HOST_OS
#include <alloca.h>
#endif
#include <limits.h>
#include <fnmatch.h>

#ifndef ffsll
#define ffsll(x) __builtin_ffsll(x)
#endif

void trap (void);

#define GF_UNIVERSAL_ANSWER 42    /* :O */

/* To solve type punned error */
#define VOID(ptr) ((void **) ((void *) ptr))

#include "logging.h"
#include "glusterfs.h"
#include "locking.h"
#include "mem-pool.h"
#include "compat-uuid.h"
#include "iatt.h"
#include "uuid.h"
#include "libglusterfs-messages.h"
#include "protocol-common.h"
#include "iobuf.h"


#define STRINGIFY(val) #val
#define TOSTRING(val) STRINGIFY(val)

#define alloca0(size) ({void *__ptr; __ptr = alloca(size); memset(__ptr, 0, size); __ptr; })

#define min(a,b) ((a)<(b)?(a):(b))
#define max(a,b) ((a)>(b)?(a):(b))
#define roof(a,b) ((((a)+(b)-1)/((b!=0)?(b):1))*(b))
#define floor(a,b) (((a)/((b!=0)?(b):1))*(b))

#define IPv4_ADDR_SIZE 32


#define GF_UNIT_KB    1024ULL
#define GF_UNIT_MB    1048576ULL
#define GF_UNIT_GB    1073741824ULL
#define GF_UNIT_TB    1099511627776ULL
#define GF_UNIT_PB    1125899906842624ULL

#define GF_UNIT_B_STRING     "B"
#define GF_UNIT_KB_STRING    "KB"
#define GF_UNIT_MB_STRING    "MB"
#define GF_UNIT_GB_STRING    "GB"
#define GF_UNIT_TB_STRING    "TB"
#define GF_UNIT_PB_STRING    "PB"

#define GF_UNIT_PERCENT_STRING      "%"

#define GEOREP "geo-replication"
#define GHADOOP "glusterfs-hadoop"
#define GLUSTERD_NAME "glusterd"

#define GF_SELINUX_XATTR_KEY "security.selinux"

#define WIPE(statp) do { typeof(*statp) z = {0,}; if (statp) *statp = z; } while (0)

#define IS_EXT_FS(fs_name)          \
        (!strcmp (fs_name, "ext2") || \
         !strcmp (fs_name, "ext3") || \
         !strcmp (fs_name, "ext4"))

/* process mode definitions */
#define GF_SERVER_PROCESS   0
#define GF_CLIENT_PROCESS   1
#define GF_GLUSTERD_PROCESS 2

/* Defining this here as it is needed by glusterd for setting
 * nfs port in volume status.
 */
#define GF_NFS3_PORT    2049

#define GF_CLIENT_PORT_CEILING 1024
#define GF_IANA_PRIV_PORTS_START 49152 /* RFC 6335 */
#define GF_CLNT_INSECURE_PORT_CEILING (GF_IANA_PRIV_PORTS_START - 1)
#define GF_PORT_MAX 65535
#define GF_PORT_ARRAY_SIZE ((GF_PORT_MAX + 7) / 8)
#define GF_LOCK_TIMER 180
#define GF_MINUTE_IN_SECONDS 60
#define GF_HOUR_IN_SECONDS (60*60)
#define GF_DAY_IN_SECONDS (24*60*60)
#define GF_WEEK_IN_SECONDS (7*24*60*60)

/* Default timeout for both barrier and changelog translator */
#define BARRIER_TIMEOUT "120"

/* Default value of signing waiting time to sign a file for bitrot */
#define SIGNING_TIMEOUT "120"

/* xxhash */
#define GF_XXH64_DIGEST_LENGTH 8
#define GF_XXHSUM64_DEFAULT_SEED 0

/* Shard */
#define GF_XATTR_SHARD_FILE_SIZE  "trusted.glusterfs.shard.file-size"
#define SHARD_ROOT_GFID "be318638-e8a0-4c6d-977d-7a937aa84806"
#define DOT_SHARD_REMOVE_ME_GFID "77dd5a45-dbf5-4592-b31b-b440382302e9"

/* Lease: buffer length for stringified lease id
 * Format: 4hexnum-4hexnum-4hexnum-4hexnum-4hexnum-4hexnum-4hexnum-4hexnum
 * Eg:6c69-6431-2d63-6c6e-7431-0000-0000-0000
 */
#define GF_LEASE_ID_BUF_SIZE  ((LEASE_ID_SIZE * 2) +     \
                               (LEASE_ID_SIZE / 2))

#define GF_PERCENTAGE(val, total) (((val)*100)/(total))

/* pthread related */
/* as per the man page, thread-name should be at max 16 bytes */
/* with prefix of 'glfs_' (5), we are left with 11 more bytes */
#define GF_THREAD_NAMEMAX 11
#define GF_THREAD_NAME_PREFIX "glfs_"
#define GF_THREAD_NAME_PREFIX_LEN 5

#include <stdbool.h>
#define gf_boolean_t    bool
#define _gf_false       false
#define _gf_true        true

/*
 * we could have initialized these as +ve values and treated
 * them as negative while comparing etc.. (which would have
 * saved us with the pain of assigning values), but since we
 * only have a few clients that use this feature, it's okay.
 */
enum _gf_special_pid
{
        GF_CLIENT_PID_MAX               =  0,
        GF_CLIENT_PID_GSYNCD            = -1,
        GF_CLIENT_PID_HADOOP            = -2,
        GF_CLIENT_PID_DEFRAG            = -3,
        GF_CLIENT_PID_NO_ROOT_SQUASH    = -4,
        GF_CLIENT_PID_QUOTA_MOUNT       = -5,
        GF_CLIENT_PID_SELF_HEALD        = -6,
        GF_CLIENT_PID_GLFS_HEAL         = -7,
        GF_CLIENT_PID_BITD              = -8,
        GF_CLIENT_PID_SCRUB             = -9,
        GF_CLIENT_PID_TIER_DEFRAG       = -10,
        GF_SERVER_PID_TRASH             = -11
};

enum _gf_xlator_ipc_targets {
        GF_IPC_TARGET_CHANGELOG = 0,
        GF_IPC_TARGET_CTR = 1,
        GF_IPC_TARGET_UPCALL = 2
};

typedef enum _gf_special_pid gf_special_pid_t;
typedef enum _gf_xlator_ipc_targets _gf_xlator_ipc_targets_t;

/* The DHT file rename operation is not a straightforward rename.
 * It involves creating linkto and linkfiles, and can unlink or rename the
 * source file depending on the hashed and cached subvols for the source
 * and target files. this makes it difficult for geo-rep to figure out that
 * a rename operation has taken place.
 *
 * We now send a special key and the values of the source and target pargfids
 * and basenames to indicate to changelog that the operation in question
 * should be treated as a rename. We are explicitly filling and sending this
 * as a binary value in the dictionary as the unlink op will not have the
 * source file information. The lengths of the src and target basenames
 * are used to calculate where to start reading the names in the structure.
 * XFS allows a max of 255 chars for filenames but other file systems might
 * not have such restrictions
 */
typedef struct dht_changelog_rename_info {
         uuid_t  old_pargfid;
         uuid_t  new_pargfid;
         int32_t oldname_len;
         int32_t newname_len;
         char    buffer[1];
 } dht_changelog_rename_info_t;


typedef int (*gf_cmp) (void *, void *);

struct _dict;

struct dnscache {
        struct _dict *cache_dict;
        time_t ttl;
};

struct dnscache_entry {
        char *ip;
        char *fqdn;
        time_t timestamp;
};

struct dnscache6 {
        struct addrinfo *first;
        struct addrinfo *next;
};

struct list_node {
        void *ptr;
        struct list_head list;
};

extern char *vol_type_str[];

struct list_node *list_node_add (void *ptr, struct list_head *list);
struct list_node *list_node_add_order (void *ptr, struct list_head *list,
                                       int (*compare)(struct list_head *,
                                            struct list_head *));
void list_node_del (struct list_node *node);

struct dnscache *gf_dnscache_init (time_t ttl);
struct dnscache_entry *gf_dnscache_entry_init (void);
void gf_dnscache_entry_deinit (struct dnscache_entry *entry);
char *gf_rev_dns_lookup_cached (const char *ip, struct dnscache *dnscache);

char *gf_resolve_path_parent (const char *path);

void gf_global_variable_init(void);

int32_t gf_resolve_ip6 (const char *hostname, uint16_t port, int family,
                        void **dnscache, struct addrinfo **addr_info);

void gf_log_dump_graph (FILE *specfp, glusterfs_graph_t *graph);
void gf_print_trace (int32_t signal, glusterfs_ctx_t *ctx);
int  gf_set_log_file_path (cmd_args_t *cmd_args, glusterfs_ctx_t *ctx);
int  gf_set_log_ident (cmd_args_t *cmd_args);

int gf_process_getspec_servers_list(cmd_args_t *cmd_args,
                                    const char *servers_list);
int gf_set_volfile_server_common (cmd_args_t *cmd_args, const char *host,
                                  const char *transport, int port);

static inline void
BIT_SET (unsigned char *array, unsigned int index)
{
        unsigned int    offset  = index / 8;
        unsigned int    shift   = index % 8;

        array[offset] |= (1 << shift);
}

static inline void
BIT_CLEAR (unsigned char *array, unsigned int index)
{
        unsigned int    offset  = index / 8;
        unsigned int    shift   = index % 8;

        array[offset] &= ~(1 << shift);
}

static inline unsigned int
BIT_VALUE (unsigned char *array, unsigned int index)
{
        unsigned int    offset  = index / 8;
        unsigned int    shift   = index % 8;

        return (array[offset] >> shift) & 0x1;
}

#define VECTORSIZE(count) (count * (sizeof (struct iovec)))

#define STRLEN_0(str) (strlen(str) + 1)

#define VALIDATE_OR_GOTO(arg,label)   do {				\
		if (!arg) {						\
			errno = EINVAL;					\
			gf_msg_callingfn ((this ? (this->name) :        \
                                           "(Govinda! Govinda!)"),      \
                                          GF_LOG_WARNING, EINVAL,       \
                                          LG_MSG_INVALID_ARG,           \
                                          "invalid argument: " #arg);   \
			goto label;					\
		}							\
	} while (0)

#define GF_VALIDATE_OR_GOTO(name,arg,label)   do {                      \
		if (!arg) {                                             \
			errno = EINVAL;                                 \
			gf_msg_callingfn (name, GF_LOG_ERROR, errno,    \
                                          LG_MSG_INVALID_ARG,           \
                                          "invalid argument: " #arg);	\
			goto label;                                     \
		}                                                       \
	} while (0)

#define GF_VALIDATE_OR_GOTO_WITH_ERROR(name, arg, label, errno, error) do { \
                if (!arg) {                                                 \
                        errno = error;                                  \
                        gf_msg_callingfn (name, GF_LOG_ERROR, EINVAL,   \
                                          LG_MSG_INVALID_ARG,         \
                                          "invalid argument: " #arg);   \
                        goto label;                                     \
                }                                                       \
        }while (0)

#define GF_CHECK_ALLOC(arg, retval, label)   do {                       \
                if (!(arg)) {                                           \
                        retval = -ENOMEM;                               \
                        goto label;                                     \
                }                                                       \
        } while (0)                                                     \

#define GF_CHECK_ALLOC_AND_LOG(name, item, retval, msg, errlabel) do {  \
                if (!(item)) {                                          \
                        (retval) = -ENOMEM;                             \
                        gf_msg (name, GF_LOG_CRITICAL, ENOMEM,          \
                                LG_MSG_NO_MEMORY, (msg));               \
                        goto errlabel;                                  \
                }                                                       \
        } while (0)

#define GF_ASSERT_AND_GOTO_WITH_ERROR(name, arg, label, errno, error) do { \
                if (!arg) {                                             \
                        GF_ASSERT (0);                                  \
                        errno = error;                                  \
                        goto label;                                     \
                }                                                       \
        }while (0)

#define GF_VALIDATE_ABSOLUTE_PATH_OR_GOTO(name,arg,label)               \
        do {                                                            \
                GF_VALIDATE_OR_GOTO (name, arg, label);                 \
                if ((arg[0]) != '/') {                                  \
                        errno = EINVAL;                                 \
			gf_msg_callingfn (name, GF_LOG_ERROR, EINVAL,   \
                                          LG_MSG_INVALID_ARG,           \
                                          "invalid argument: " #arg);	\
                        goto label;                                     \
                }                                                       \
	} while (0)

#define GF_REMOVE_SLASH_FROM_PATH(path, string)                         \
        do {                                                            \
                int i = 0;                                              \
                for (i = 1; i < strlen (path); i++) {                   \
                        string[i-1] = path[i];                          \
                        if (string[i-1] == '/')                         \
                                string[i-1] = '-';                      \
                }                                                       \
        } while (0)

#define GF_REMOVE_INTERNAL_XATTR(pattern, dict)                         \
        do {                                                            \
                if (!dict) {                                            \
                        gf_msg (this->name, GF_LOG_ERROR, 0,            \
                                LG_MSG_DICT_NULL, "dict is null");      \
                        break;                                          \
                }                                                       \
                dict_foreach_fnmatch (dict, pattern,                    \
                                      dict_remove_foreach_fn,           \
                                      NULL);                            \
        } while (0)

#define GF_IF_INTERNAL_XATTR_GOTO(pattern, dict, op_errno, label)       \
        do {                                                            \
                if (!dict) {                                            \
                        gf_msg (this->name, GF_LOG_ERROR, 0,            \
                                LG_MSG_DICT_NULL,                        \
                                "setxattr dict is null");               \
                        goto label;                                     \
                }                                                       \
                if (dict_foreach_fnmatch (dict, pattern,                \
                                          dict_null_foreach_fn,         \
                                          NULL) > 0) {                  \
                        op_errno = EPERM;                               \
                        gf_msg (this->name, GF_LOG_ERROR, op_errno,     \
                                LG_MSG_NO_PERM,                         \
                                "attempt to set internal"               \
                                " xattr: %s", pattern);                 \
                        goto label;                                     \
                }                                                       \
        } while (0)

#define GF_IF_NATIVE_XATTR_GOTO(pattern, key, op_errno, label)          \
        do {                                                            \
                if (!key) {                                             \
                        gf_msg (this->name, GF_LOG_ERROR, 0,            \
                                LG_MSG_NO_KEY,                          \
                                "no key for removexattr");              \
                        goto label;                                     \
                }                                                       \
                if (!fnmatch (pattern, key, 0)) {                       \
                        op_errno = EPERM;                               \
                        gf_msg (this->name, GF_LOG_ERROR, op_errno,     \
                                LG_MSG_NO_PERM,                         \
                                "attempt to remove internal "           \
                                "xattr: %s", key);                      \
                        goto label;                                     \
                }                                                       \
        } while (0)


#define GF_FILE_CONTENT_REQUESTED(_xattr_req,_content_limit) \
	(dict_get_uint64 (_xattr_req, "glusterfs.content", _content_limit) == 0)

#ifdef DEBUG
#define GF_ASSERT(x) assert (x);
#else
#define GF_ASSERT(x)                                                    \
        do {                                                            \
                if (!(x)) {                                             \
                        gf_msg_callingfn ("", GF_LOG_ERROR, 0,          \
                                          LG_MSG_ASSERTION_FAILED,      \
                                          "Assertion failed: " #x);     \
                }                                                       \
        } while (0)
#endif

#define GF_ABORT(msg)                                                   \
        do {                                                            \
                gf_msg_callingfn ("", GF_LOG_CRITICAL, 0,               \
                                  LG_MSG_ASSERTION_FAILED,              \
                                  "Assertion failed: " msg);            \
                abort();                                                \
        } while (0)

#define GF_UUID_ASSERT(u) \
        if (gf_uuid_is_null (u))\
                GF_ASSERT (!"uuid null");

#define GF_IGNORE_IF_GSYNCD_SAFE_ERROR(frame, op_errno)                 \
        (((frame->root->pid == GF_CLIENT_PID_GSYNCD) &&                 \
          (op_errno == EEXIST || op_errno == ENOENT))?0:1)              \

union gf_sock_union {
        struct sockaddr_storage storage;
        struct sockaddr_in6 sin6;
        struct sockaddr_in sin;
        struct sockaddr sa;
};

#define GF_HIDDEN_PATH ".glusterfs"
#define GF_UNLINK_PATH GF_HIDDEN_PATH"/unlink"
#define GF_LANDFILL_PATH GF_HIDDEN_PATH"/landfill"

#define IOV_MIN(n) min(IOV_MAX,n)

#define GF_SKIP_IRRELEVANT_ENTRIES(entry, dir, scr) \
        do {\
                entry = NULL;\
                if (dir) { \
                        entry = sys_readdir (dir, scr); \
                        while (entry && (!strcmp (entry->d_name, ".") || \
                            !fnmatch ("*.tmp", entry->d_name, 0) || \
                            !strcmp (entry->d_name, ".."))) { \
                                entry = sys_readdir (dir, scr); \
                        } \
                } \
        } while (0)

static inline void
iov_free (struct iovec *vector, int count)
{
	int i;

	for (i = 0; i < count; i++)
		FREE (vector[i].iov_base);

	GF_FREE (vector);
}


static inline int
iov_length (const struct iovec *vector, int count)
{
	int     i = 0;
	size_t  size = 0;

	for (i = 0; i < count; i++)
		size += vector[i].iov_len;

	return size;
}


static inline struct iovec *
iov_dup (const struct iovec *vector, int count)
{
	int           bytecount = 0;
	int           i;
	struct iovec *newvec = NULL;

	bytecount = (count * sizeof (struct iovec));
	newvec = GF_MALLOC (bytecount, gf_common_mt_iovec);
	if (!newvec)
		return NULL;

	for (i = 0; i < count; i++) {
		newvec[i].iov_len  = vector[i].iov_len;
		newvec[i].iov_base = vector[i].iov_base;
	}

	return newvec;
}


static inline int
iov_subset (struct iovec *orig, int orig_count,
	    off_t src_offset, off_t dst_offset,
	    struct iovec *new)
{
	int    new_count = 0;
	int    i;
	off_t  offset = 0;
	size_t start_offset = 0;
	size_t end_offset = 0, origin_iov_len = 0;


	for (i = 0; i < orig_count; i++) {
                origin_iov_len = orig[i].iov_len;

		if ((offset + orig[i].iov_len < src_offset)
		    || (offset > dst_offset)) {
			goto not_subset;
		}

		if (!new) {
			goto count_only;
		}

		start_offset = 0;
		end_offset = orig[i].iov_len;

		if (src_offset >= offset) {
			start_offset = (src_offset - offset);
		}

		if (dst_offset <= (offset + orig[i].iov_len)) {
			end_offset = (dst_offset - offset);
		}

		new[new_count].iov_base = orig[i].iov_base + start_offset;
		new[new_count].iov_len = end_offset - start_offset;

	count_only:
		new_count++;

	not_subset:
		offset += origin_iov_len;
	}

	return new_count;
}


static inline void
iov_unload (char *buf, const struct iovec *vector, int count)
{
	int i;
	int copied = 0;

	for (i = 0; i < count; i++) {
		memcpy (buf + copied, vector[i].iov_base, vector[i].iov_len);
		copied += vector[i].iov_len;
	}
}


static inline size_t
iov_load (const struct iovec *vector, int count, char *buf, int size)
{
	size_t left = size;
	size_t cp = 0;
	int    ret = 0;
	int    i = 0;

	while (left && i < count) {
		cp = min (vector[i].iov_len, left);
		if (vector[i].iov_base != buf + (size - left))
			memcpy (vector[i].iov_base, buf + (size - left), cp);
		ret += cp;
		left -= cp;
		if (left)
			i++;
	}

	return ret;
}


static inline size_t
iov_copy (const struct iovec *dst, int dcnt,
	  const struct iovec *src, int scnt)
{
	size_t  ret = 0;
	size_t  left = 0;
	size_t  min_i = 0;
	int     s_i = 0, s_ii = 0;
	int     d_i = 0, d_ii = 0;

	ret = min (iov_length (dst, dcnt), iov_length (src, scnt));
	left = ret;

	while (left) {
		min_i = min (dst[d_i].iov_len - d_ii, src[s_i].iov_len - s_ii);
		memcpy (dst[d_i].iov_base + d_ii, src[s_i].iov_base + s_ii,
			min_i);

		d_ii += min_i;
		if (d_ii == dst[d_i].iov_len) {
			d_ii = 0;
			d_i++;
		}

		s_ii += min_i;
		if (s_ii == src[s_i].iov_len) {
			s_ii = 0;
			s_i++;
		}

		left -= min_i;
	}

	return ret;
}


static inline int
mem_0filled (const char *buf, size_t size)
{
	int i = 0;
	int ret = 0;

	for (i = 0; i < size; i++) {
		ret = buf[i];
		if (ret)
			break;
	}

	return ret;
}


static inline int
iov_0filled (struct iovec *vector, int count)
{
	int i = 0;
	int ret = 0;

	for (i = 0; i < count; i++) {
		ret = mem_0filled (vector[i].iov_base, vector[i].iov_len);
		if (ret)
			break;
	}

	return ret;
}


static inline void *
memdup (const void *ptr, size_t size)
{
	void *newptr = NULL;

	newptr = GF_MALLOC (size, gf_common_mt_memdup);
	if (!newptr)
		return NULL;

	memcpy (newptr, ptr, size);
	return newptr;
}

typedef enum {
        gf_timefmt_default = 0,
        gf_timefmt_FT = 0,  /* YYYY-MM-DD hh:mm:ss */
        gf_timefmt_Ymd_T,   /* YYYY/MM-DD-hh:mm:ss */
        gf_timefmt_bdT,     /* MMM DD hh:mm:ss */
        gf_timefmt_F_HMS,   /* YYYY-MM-DD hhmmss */
	gf_timefmt_dirent,
        gf_timefmt_s,
        gf_timefmt_last
} gf_timefmts;

static inline char *
gf_time_fmt (char *dst, size_t sz_dst, time_t utime, unsigned int fmt)
{
        extern void _gf_timestuff (const char ***, const char ***);
        static gf_timefmts timefmt_last = (gf_timefmts) - 1;
        static const char **fmts;
        static const char **zeros;
        struct tm tm, *res;
        int localtime = 0;

        if (timefmt_last == ((gf_timefmts)-1)) {
                _gf_timestuff (&fmts, &zeros);
                timefmt_last = gf_timefmt_last;
        }
        if (timefmt_last <= fmt) {
                fmt = gf_timefmt_default;
        }
        localtime = gf_log_get_localtime ();
        res = localtime ? localtime_r (&utime, &tm) : gmtime_r (&utime, &tm);
        if (utime && (res != NULL)) {
                strftime (dst, sz_dst, fmts[fmt], &tm);
        } else {
                strncpy (dst, "N/A", sz_dst);
        }
        return dst;
}

/* This function helps us use gfid (unique identity) to generate inode's unique
 * number in glusterfs.
 */
ino_t
gfid_to_ino (uuid_t gfid);

int
mkdir_p (char *path, mode_t mode, gf_boolean_t allow_symlinks);
/*
 * rounds up nr to power of two. If nr is already a power of two, just returns
 * nr
 */

int
gf_lstat_dir (const char *path, struct stat *stbuf_in);

int32_t gf_roundup_power_of_two (int32_t nr);

/*
 * rounds up nr to next power of two. If nr is already a power of two, next
 * power of two is returned.
 */

int32_t gf_roundup_next_power_of_two (int32_t nr);

char *gf_trim (char *string);
int gf_volume_name_validate (const char *volume_name);

int gf_string2long (const char *str, long *n);
int gf_string2ulong (const char *str, unsigned long *n);
int gf_string2int (const char *str, int *n);
int gf_string2uint (const char *str, unsigned int *n);
int gf_string2double (const char *str, double *n);
int gf_string2longlong (const char *str, long long *n);
int gf_string2ulonglong (const char *str, unsigned long long *n);

int gf_string2int8 (const char *str, int8_t *n);
int gf_string2int16 (const char *str, int16_t *n);
int gf_string2int32 (const char *str, int32_t *n);
int gf_string2int64 (const char *str, int64_t *n);
int gf_string2uint8 (const char *str, uint8_t *n);
int gf_string2uint16 (const char *str, uint16_t *n);
int gf_string2uint32 (const char *str, uint32_t *n);
int gf_string2uint64 (const char *str, uint64_t *n);

int gf_strstr (const char *str, const char *delim, const char *match);

int gf_string2ulong_base10 (const char *str, unsigned long *n);
int gf_string2uint_base10 (const char *str, unsigned int *n);
int gf_string2uint8_base10 (const char *str, uint8_t *n);
int gf_string2uint16_base10 (const char *str, uint16_t *n);
int gf_string2uint32_base10 (const char *str, uint32_t *n);
int gf_string2uint64_base10 (const char *str, uint64_t *n);
int gf_string2bytesize (const char *str, uint64_t *n);
int gf_string2bytesize_size (const char *str, size_t *n);
int gf_string2bytesize_uint64 (const char *str, uint64_t *n);
int gf_string2bytesize_int64 (const char *str, int64_t *n);
int gf_string2percent_or_bytesize (const char *str, double *n,
				   gf_boolean_t *is_percent);

int gf_string2boolean (const char *str, gf_boolean_t *b);
int gf_string2percent (const char *str, double *n);
int gf_string2time (const char *str, uint32_t *n);

int gf_lockfd (int fd);
int gf_unlockfd (int fd);

int get_checksum_for_file (int fd, uint32_t *checksum);
int log_base2 (unsigned long x);

int get_checksum_for_path (char *path, uint32_t *checksum);
int get_file_mtime (const char *path, time_t *stamp);
char *gf_resolve_path_parent (const char *path);

char *strtail (char *str, const char *pattern);
void skipwhite (char **s);
char *nwstrtail (char *str, char *pattern);
/* returns a new string with nth word of given string. n>=1 */

typedef struct token_iter {
        char *end;
        char sep;
} token_iter_t;
char *token_iter_init (char *str, char sep, token_iter_t *tit);
gf_boolean_t next_token (char **tokenp, token_iter_t *tit);
void drop_token (char *token, token_iter_t *tit);

gf_boolean_t mask_match (const uint32_t a, const uint32_t b, const uint32_t m);
gf_boolean_t gf_is_ip_in_net (const char *network, const char *ip_str);
char valid_host_name (char *address, int length);
char valid_ipv4_address (char *address, int length, gf_boolean_t wildcard_acc);
char valid_ipv6_address (char *address, int length, gf_boolean_t wildcard_acc);
char valid_internet_address (char *address, gf_boolean_t wildcard_acc);
gf_boolean_t valid_mount_auth_address (char *address);
gf_boolean_t valid_ipv4_subnetwork (const char *address);
gf_boolean_t gf_sock_union_equal_addr (union gf_sock_union *a,
                                       union gf_sock_union *b);
char *gf_rev_dns_lookup (const char *ip);

char *uuid_utoa (uuid_t uuid);
char *uuid_utoa_r (uuid_t uuid, char *dst);
char *lkowner_utoa (gf_lkowner_t *lkowner);
char *lkowner_utoa_r (gf_lkowner_t *lkowner, char *dst, int len);
char *leaseid_utoa (const char *lease_id);
gf_boolean_t is_valid_lease_id (const char *lease_id);
char *gf_leaseid_get (void);
char *gf_existing_leaseid (void);

void gf_array_insertionsort (void *a, int l, int r, size_t elem_size,
                             gf_cmp cmp);
int gf_is_str_int (const char *value);

char *gf_uint64_2human_readable (uint64_t);
int get_vol_type (int type, int dist_count, int brick_count);
int validate_brick_name (char *brick);
char *get_host_name (char *word, char **host);
char *get_path_name (char *word, char **path);
void gf_path_strip_trailing_slashes (char *path);
uint64_t get_mem_size (void);
int gf_strip_whitespace (char *str, int len);
int gf_canonicalize_path (char *path);
char *generate_glusterfs_ctx_id (void);
char *gf_get_reserved_ports(void);
int gf_process_reserved_ports (unsigned char *ports, uint32_t ceiling);
gf_boolean_t
gf_ports_reserved (char *blocked_port, unsigned char *ports, uint32_t ceiling);
int gf_get_hostname_from_ip (char *client_ip, char **hostname);
gf_boolean_t gf_is_local_addr (char *hostname);
gf_boolean_t gf_is_same_address (char *host1, char *host2);
void gf_xxh64_wrapper(const unsigned char *data, size_t const len,
                      unsigned long long const seed, char *xxh64);
int gf_set_timestamp  (const char *src, const char* dest);

int gf_thread_create (pthread_t *thread, const pthread_attr_t *attr,
                      void *(*start_routine)(void *), void *arg,
                      const char *name);
int gf_thread_create_detached (pthread_t *thread,
                      void *(*start_routine)(void *), void *arg,
                      const char *name);
gf_boolean_t
gf_is_pid_running (int pid);
gf_boolean_t
gf_is_service_running (char *pidfile, int *pid);
gf_boolean_t
gf_valid_pid (const char *pid, int length);
int
gf_skip_header_section (int fd, int header_len);

struct iatt;
struct _dict;

gf_boolean_t
dht_is_linkfile (struct iatt *buf, struct _dict *dict);

int
gf_check_log_format (const char *value);

int
gf_check_logger (const char *value);

gf_boolean_t
gf_compare_sockaddr (const struct sockaddr *addr1,
                     const struct sockaddr *addr2);

char *
gf_backtrace_save (char *buf);

void
gf_backtrace_done (char *buf);

gf_loglevel_t
fop_log_level (glusterfs_fop_t fop, int op_errno);

int32_t
gf_build_absolute_path (char *current_path, char *relative_path, char **path);

int
recursive_rmdir (const char *delete_path);

int
gf_get_index_by_elem (char **array, char *elem);

int
glusterfs_is_local_pathinfo (char *pathinfo, gf_boolean_t *local);

int
gf_thread_cleanup_xint (pthread_t thread);

ssize_t
gf_nread (int fd, void *buf, size_t count);

ssize_t
gf_nwrite (int fd, const void *buf, size_t count);

void _mask_cancellation (void);
void _unmask_cancellation (void);

gf_boolean_t
gf_is_zero_filled_stat (struct iatt *buf);

void
gf_zero_fill_stat (struct iatt *buf);

gf_boolean_t
gf_is_valid_xattr_namespace (char *k);

const char *
gf_inode_type_to_str (ia_type_t type);

int32_t
gf_bits_count (uint64_t n);

int32_t
gf_bits_index (uint64_t n);

const char*
gf_fop_string (glusterfs_fop_t fop);

int
gf_fop_int (char *fop);

char *
get_ip_from_addrinfo (struct addrinfo *addr, char **ip);

int
close_fds_except (int *fdv, size_t count);

int
gf_getgrouplist (const char *user, gid_t group, gid_t **groups);

int
glusterfs_compute_sha256 (const unsigned char *content, size_t size,
                          char *sha256_hash);
char*
get_struct_variable (int mem_num, gf_gsync_status_t *sts_val);

char *
gf_strncpy (char *dest, const char *src, const size_t dest_size);

void
gf_strTrim (char **s);

int
gf_replace_old_iatt_in_dict (struct _dict *);

int
gf_replace_new_iatt_in_dict (struct _dict *);

#endif /* _COMMON_UTILS_H */