summaryrefslogtreecommitdiffstats
path: root/xlators/cluster/afr/src/afr.h
blob: 836a64d0a1f4deac6e02d9f6b840c04b534c7d00 (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
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
/*
  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 __AFR_H__
#define __AFR_H__

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "call-stub.h"
#include "compat-errno.h"
#include "afr-mem-types.h"
#include "afr-self-heal-algorithm.h"

#include "libxlator.h"
#include "timer.h"

#define AFR_XATTR_PREFIX "trusted.afr"
#define AFR_PATHINFO_HEADER "REPLICATE:"
#define AFR_SH_READDIR_SIZE_KEY "self-heal-readdir-size"

#define AFR_LOCKEE_COUNT_MAX    3

struct _pump_private;

typedef int (*afr_expunge_done_cbk_t) (call_frame_t *frame, xlator_t *this,
                                       int child, int32_t op_error,
                                       int32_t op_errno);

typedef int (*afr_impunge_done_cbk_t) (call_frame_t *frame, xlator_t *this,
                                       int32_t op_error, int32_t op_errno);
typedef int (*afr_post_remove_call_t) (call_frame_t *frame, xlator_t *this);

typedef int (*afr_lock_cbk_t) (call_frame_t *frame, xlator_t *this);
typedef void (*afr_lookup_done_cbk_t) (call_frame_t *frame, xlator_t *this,
                                      int32_t op_ret, int32_t op_errno);

typedef enum {
        AFR_POS_UNKNOWN,
        AFR_POS_LOCAL,
        AFR_POS_REMOTE
} afr_child_pos_t;

typedef enum {
        SPLIT_BRAIN = 1,
        ALL_FOOLS = 2
} afr_subvol_status_t;

typedef enum {
        AFR_INODE_SET_READ_CTX = 1,
        AFR_INODE_RM_STALE_CHILDREN,
        AFR_INODE_SET_OPENDIR_DONE,
        AFR_INODE_GET_READ_CTX,
        AFR_INODE_GET_OPENDIR_DONE,
} afr_inode_op_t;

typedef struct afr_inode_params_ {
        afr_inode_op_t op;
        union {
                gf_boolean_t value;
                struct {
                        int32_t read_child;
                        int32_t *children;
                } read_ctx;
        } u;
} afr_inode_params_t;

typedef enum afr_spb_state {
        DONT_KNOW,
        SPB,
        NO_SPB
} afr_spb_state_t;

typedef struct afr_inode_ctx_ {
        uint64_t masks;
        int32_t  *fresh_children;//increasing order of latency
        afr_spb_state_t mdata_spb;
        afr_spb_state_t data_spb;
} afr_inode_ctx_t;

typedef enum {
        NONE,
        INDEX,
        FULL,
} afr_crawl_type_t;

typedef struct afr_self_heald_ {
        gf_boolean_t     enabled;
        gf_boolean_t     iamshd;
        afr_crawl_type_t *pending;
        gf_boolean_t     *inprogress;
        afr_child_pos_t  *pos;
        gf_timer_t       **timer;
        eh_t             *healed;
        eh_t             *heal_failed;
        eh_t             *split_brain;
        char             *node_uuid;
        int              timeout;
} afr_self_heald_t;

typedef struct _afr_private {
        gf_lock_t lock;               /* to guard access to child_count, etc */
        unsigned int child_count;     /* total number of children   */

        unsigned int read_child_rr;   /* round-robin index of the read_child */
        gf_lock_t read_child_lock;    /* lock to protect above */

        xlator_t **children;

        int first_lookup;
        inode_t *root_inode;

        unsigned char *child_up;

        char **pending_key;

        char         *data_self_heal;              /* on/off/open */
        char *       data_self_heal_algorithm;    /* name of algorithm */
        unsigned int data_self_heal_window_size;  /* max number of pipelined
                                                     read/writes */

        unsigned int background_self_heal_count;
        unsigned int background_self_heals_started;
        gf_boolean_t metadata_self_heal;   /* on/off */
        gf_boolean_t entry_self_heal;      /* on/off */

        gf_boolean_t data_change_log;       /* on/off */
        gf_boolean_t metadata_change_log;   /* on/off */
        gf_boolean_t entry_change_log;      /* on/off */

        int read_child;               /* read-subvolume */
        unsigned int hash_mode;       /* for when read_child is not set */
        int favorite_child;  /* subvolume to be preferred in resolving
                                         split-brain cases */

        gf_boolean_t inodelk_trace;
        gf_boolean_t entrylk_trace;

        gf_boolean_t strict_readdir;

        unsigned int wait_count;      /* # of servers to wait for success */

        uint64_t up_count;      /* number of CHILD_UPs we have seen */
        uint64_t down_count;    /* number of CHILD_DOWNs we have seen */

        struct _pump_private *pump_private; /* Set if we are loaded as pump */
        int                   use_afr_in_pump;

        pthread_mutex_t  mutex;
        struct list_head saved_fds;   /* list of fds on which locks have succeeded */
        gf_boolean_t      optimistic_change_log;
        gf_boolean_t      eager_lock;
	uint32_t          post_op_delay_secs;
        unsigned int      quorum_count;

        char                   vol_uuid[UUID_SIZE + 1];
        int32_t                *last_event;
        afr_self_heald_t       shd;
        gf_boolean_t           choose_local;
        gf_boolean_t           did_discovery;
        gf_boolean_t           readdir_failover;
        uint64_t               sh_readdir_size;
} afr_private_t;

typedef enum {
        AFR_SELF_HEAL_NOT_ATTEMPTED,
        AFR_SELF_HEAL_STARTED,
        AFR_SELF_HEAL_FAILED,
} afr_self_heal_status;

typedef struct {
        afr_self_heal_status gfid_or_missing_entry_self_heal;
        afr_self_heal_status metadata_self_heal;
        afr_self_heal_status data_self_heal;
        afr_self_heal_status entry_self_heal;
} afr_sh_status_for_all_type;

typedef enum {
        AFR_SELF_HEAL_ENTRY,
        AFR_SELF_HEAL_METADATA,
        AFR_SELF_HEAL_DATA,
        AFR_SELF_HEAL_GFID_OR_MISSING_ENTRY,
        AFR_SELF_HEAL_INVALID = -1,
} afr_self_heal_type;

typedef enum {
        AFR_CHECK_ALL,
        AFR_CHECK_SPECIFIC,
} afr_sh_fail_check_type;

struct afr_self_heal_ {
        /* External interface: These are variables (some optional) that
           are set by whoever has triggered self-heal */

        gf_boolean_t do_data_self_heal;
        gf_boolean_t do_metadata_self_heal;
        gf_boolean_t do_entry_self_heal;
        gf_boolean_t do_gfid_self_heal;
        gf_boolean_t do_missing_entry_self_heal;
        gf_boolean_t force_confirm_spb; /* Check for split-brains even when
                                           self-heal is turned off */

        gf_boolean_t forced_merge;        /* Is this a self-heal triggered to
                                             forcibly merge the directories? */

        gf_boolean_t background;          /* do self-heal in background
                                             if possible */
        ia_type_t type;                   /* st_mode of the entry we're doing
                                             self-heal on */
        inode_t   *inode;                 /* inode on which the self-heal is
                                             performed on */
        uuid_t  sh_gfid_req;                 /* gfid self-heal needs to be done
                                             with this gfid if it is not null */

        /* Function to call to unwind. If self-heal is being done in the
           background, this function will be called as soon as possible. */

        int (*unwind) (call_frame_t *frame, xlator_t *this, int32_t op_ret,
                       int32_t op_errno, int32_t sh_failed);

        /* End of external interface members */


        /* array of stat's, one for each child */
        struct iatt *buf;
        struct iatt *parentbufs;
        struct iatt parentbuf;
        struct iatt entrybuf;

        afr_expunge_done_cbk_t expunge_done;
        afr_impunge_done_cbk_t impunge_done;

        /* array of xattr's, one for each child */
        dict_t **xattr;

        /* array containing if the lookups succeeded in the order of response
         */
        int32_t *success_children;
        int     success_count;
        /* array containing the fresh children found in the self-heal process */
        int32_t *fresh_children;
        /* array containing the fresh children found in the parent lookup */
        int32_t *fresh_parent_dirs;
        /* array of errno's, one for each child */
        int *child_errno;
        /*loc used for lookup*/
        loc_t lookup_loc;
        int32_t lookup_flags;
        afr_lookup_done_cbk_t lookup_done;

        int32_t **pending_matrix;
        int32_t **delta_matrix;

        int32_t op_ret;
        int32_t op_errno;

        int *sources;
        int source;
        int active_source;
        int active_sinks;
        unsigned char *success;
        unsigned char *locked_nodes;
        int lock_count;

        const char *linkname;
        gf_boolean_t entries_skipped;

        gf_boolean_t actual_sh_started;
        gf_boolean_t sync_done;
        gf_boolean_t data_lock_held;
        gf_boolean_t eof_reached;
        fd_t  *healing_fd;
        int   file_has_holes;
        blksize_t block_size;
        off_t file_size;
        off_t offset;
        unsigned char *write_needed;
        uint8_t *checksum;
        afr_post_remove_call_t post_remove_call;

        loc_t parent_loc;
        call_frame_t *orig_frame;
        call_frame_t *old_loop_frame;
        gf_boolean_t unwound;

        afr_sh_algo_private_t *private;
        afr_sh_status_for_all_type  afr_all_sh_status;
        afr_self_heal_type       sh_type_in_action;

        struct afr_sh_algorithm  *algo;
        afr_lock_cbk_t data_lock_success_handler;
        afr_lock_cbk_t data_lock_failure_handler;
	gf_boolean_t data_lock_block;
        int (*completion_cbk) (call_frame_t *frame, xlator_t *this);
        int (*sh_data_algo_start) (call_frame_t *frame, xlator_t *this);
        int (*algo_completion_cbk) (call_frame_t *frame, xlator_t *this);
        int (*algo_abort_cbk) (call_frame_t *frame, xlator_t *this);
        void (*gfid_sh_success_cbk) (call_frame_t *sh_frame, xlator_t *this);

        call_frame_t *sh_frame;
};

typedef struct afr_self_heal_ afr_self_heal_t;

typedef enum {
        AFR_DATA_TRANSACTION,          /* truncate, write, ... */
        AFR_METADATA_TRANSACTION,      /* chmod, chown, ... */
        AFR_ENTRY_TRANSACTION,         /* create, rmdir, ... */
        AFR_ENTRY_RENAME_TRANSACTION,  /* rename */
} afr_transaction_type;

typedef enum {
        AFR_TRANSACTION_LK,
        AFR_SELFHEAL_LK,
} transaction_lk_type_t;

typedef enum {
        AFR_LOCK_OP,
        AFR_UNLOCK_OP,
} afr_lock_op_type_t;

typedef enum {
        AFR_DATA_SELF_HEAL_LK,
        AFR_METADATA_SELF_HEAL_LK,
        AFR_ENTRY_SELF_HEAL_LK,
}selfheal_lk_type_t;

typedef enum {
        AFR_INODELK_TRANSACTION,
        AFR_INODELK_NB_TRANSACTION,
        AFR_ENTRYLK_TRANSACTION,
        AFR_ENTRYLK_NB_TRANSACTION,
        AFR_INODELK_SELFHEAL,
        AFR_INODELK_NB_SELFHEAL,
        AFR_ENTRYLK_SELFHEAL,
        AFR_ENTRYLK_NB_SELFHEAL,
} afr_lock_call_type_t;

/*
  xattr format: trusted.afr.volume = [x y z]
  x - data pending
  y - metadata pending
  z - entry pending
*/

static inline int
afr_index_for_transaction_type (afr_transaction_type type)
{
        switch (type) {

        case AFR_DATA_TRANSACTION:
                return 0;

        case AFR_METADATA_TRANSACTION:
                return 1;

        case AFR_ENTRY_TRANSACTION:
        case AFR_ENTRY_RENAME_TRANSACTION:
                return 2;
        }

        return -1;  /* make gcc happy */
}

typedef struct {
        loc_t                   loc;
        char                    *basename;
        unsigned char           *locked_nodes;
        int                     locked_count;

} afr_entry_lockee_t;

int
afr_entry_lockee_cmp (const void *l1, const void *l2);

typedef struct {
        loc_t *lk_loc;
        struct gf_flock lk_flock;

        int                     lockee_count;
        afr_entry_lockee_t      lockee[AFR_LOCKEE_COUNT_MAX];

        const char *lk_basename;
        const char *lower_basename;
        const char *higher_basename;
        char lower_locked;
        char higher_locked;

        unsigned char *locked_nodes;
        unsigned char *lower_locked_nodes;
        unsigned char *inode_locked_nodes;

        selfheal_lk_type_t selfheal_lk_type;
        transaction_lk_type_t transaction_lk_type;

        int32_t lock_count;
        int32_t inodelk_lock_count;
        int32_t entrylk_lock_count;

        uint64_t lock_number;
        int32_t lk_call_count;
        int32_t lk_expected_count;
        int32_t lk_attempted_count;

        int32_t lock_op_ret;
        int32_t lock_op_errno;
        afr_lock_cbk_t lock_cbk;
} afr_internal_lock_t;

typedef struct _afr_locked_fd {
        fd_t  *fd;
        struct list_head list;
} afr_locked_fd_t;

struct afr_reply {
	int	valid;
	int32_t	op_ret;
	int32_t	op_errno;
};

typedef struct _afr_local {
        int     uid;
        int     gid;
        unsigned int call_count;
        unsigned int success_count;
        unsigned int enoent_count;


        unsigned int unhealable;

        unsigned int read_child_index;
        unsigned char read_child_returned;
        unsigned int first_up_child;

	gf_lkowner_t  saved_lk_owner;

        int32_t op_ret;
        int32_t op_errno;

        int32_t **pending;

        loc_t loc;
        loc_t newloc;

        fd_t *fd;

        glusterfs_fop_t fop;

        unsigned char *child_up;
        int32_t       *fresh_children; //in the order of response

        int32_t *child_errno;

        dict_t  *xattr_req;

        int32_t  inodelk_count;
        int32_t  entrylk_count;

        afr_internal_lock_t internal_lock;

        afr_locked_fd_t *locked_fd;
        int32_t          source_child;
        int32_t          lock_recovery_child;

        dict_t  *dict;
        int      optimistic_change_log;
	gf_boolean_t      delayed_post_op;

	/* Is the current writev() going to perform a stable write?
	   i.e, is fd->flags or @flags writev param have O_SYNC or
	   O_DSYNC?
	*/
	gf_boolean_t      stable_write;

        /*
          This struct contains the arguments for the "continuation"
          (scheme-like) of fops
        */

        int   op;
        struct {
                struct {
                        unsigned char buf_set;
                        struct statvfs buf;
                } statfs;

                struct {
                        uint32_t parent_entrylk;
                        uuid_t  gfid_req;
                        inode_t *inode;
                        struct iatt buf;
                        struct iatt postparent;
                        dict_t **xattrs;
                        dict_t *xattr;
                        struct iatt *postparents;
                        struct iatt *bufs;
                        int32_t read_child;
                        int32_t *sources;
                        int32_t *success_children;
                        int32_t **pending_matrix;
                        gf_boolean_t fresh_lookup;
                        gf_boolean_t possible_spb;
                } lookup;

                struct {
                        int32_t flags;
                } open;

                struct {
                        int32_t cmd;
                        struct gf_flock user_flock;
                        struct gf_flock ret_flock;
                        unsigned char *locked_nodes;
                } lk;

                /* inode read */

                struct {
                        int32_t mask;
                        int last_index;  /* index of the child we tried previously */
                } access;

                struct {
                        int last_index;
                } stat;

                struct {
                        int last_index;
                } fstat;

                struct {
                        size_t size;
                        int last_index;
                } readlink;

                struct {
                        char *name;
                        int last_index;
                        long xattr_len;
                } getxattr;

                struct {
                        size_t size;
                        off_t offset;
                        int last_index;
                        uint32_t flags;
                } readv;

                /* dir read */

                struct {
                        int success_count;
                        int32_t op_ret;
                        int32_t op_errno;

                        uint32_t *checksum;
                } opendir;

                struct {
                        int32_t op_ret;
                        int32_t op_errno;
                        size_t size;
                        off_t offset;
                        dict_t *dict;
                        gf_boolean_t failed;
                        int last_index;
                } readdir;
                /* inode write */

                struct {
                        struct iatt prebuf;
                        struct iatt postbuf;

                        int32_t op_ret;

                        struct iovec *vector;
                        struct iobref *iobref;
                        int32_t count;
                        off_t offset;
                        uint32_t flags;
                } writev;

                struct {
                        struct iatt prebuf;
                        struct iatt postbuf;
                } fsync;

                struct {
                        off_t offset;
                        struct iatt prebuf;
                        struct iatt postbuf;
                } truncate;

                struct {
                        off_t offset;
                        struct iatt prebuf;
                        struct iatt postbuf;
                } ftruncate;

                struct {
                        struct iatt in_buf;
                        int32_t valid;
                        struct iatt preop_buf;
                        struct iatt postop_buf;
                } setattr;

                struct {
                        struct iatt in_buf;
                        int32_t valid;
                        struct iatt preop_buf;
                        struct iatt postop_buf;
                } fsetattr;

                struct {
                        dict_t *dict;
                        int32_t flags;
                } setxattr;

                struct {
                        dict_t *dict;
                        int32_t flags;
                } fsetxattr;

                struct {
                        char *name;
                } removexattr;

                struct {
                        dict_t *xattr;
                } xattrop;

                struct {
                        dict_t *xattr;
                } fxattrop;

                /* dir write */

                struct {
                        inode_t *inode;
                        struct iatt buf;
                        struct iatt preparent;
                        struct iatt postparent;
                        struct iatt prenewparent;
                        struct iatt postnewparent;
                } dir_fop; //common structure for all dir fops

                struct {
                        fd_t *fd;
                        dict_t *params;
                        int32_t flags;
                        mode_t mode;
                } create;

                struct {
                        dev_t dev;
                        mode_t mode;
                        dict_t *params;
                } mknod;

                struct {
                        int32_t mode;
                        dict_t *params;
                } mkdir;

                struct {
                        int flags;
                } rmdir;

                struct {
                        dict_t *params;
                        char *linkpath;
                } symlink;

		struct {
			int32_t mode;
			off_t offset;
			size_t len;
			struct iatt prebuf;
			struct iatt postbuf;
		} fallocate;

		struct {
			off_t offset;
			size_t len;
			struct iatt prebuf;
			struct iatt postbuf;
		} discard;

        } cont;

        struct {
                off_t start, len;

                gf_boolean_t    eager_lock_on;
                int *eager_lock;

                char *basename;
                char *new_basename;

                loc_t parent_loc;
                loc_t new_parent_loc;

                afr_transaction_type type;

		/* pre-compute the post piggyback status before
		   entering POST-OP phase
		*/
		int              *postop_piggybacked;

		/* stub to resume on destruction
		   of the transaction frame */
		call_stub_t      *resume_stub;

		struct list_head  eager_locked;

                int32_t         **txn_changelog;//changelog after pre+post ops
                unsigned char   *pre_op;

                call_frame_t *main_frame;

                int (*fop) (call_frame_t *frame, xlator_t *this);

                int (*done) (call_frame_t *frame, xlator_t *this);

                int (*resume) (call_frame_t *frame, xlator_t *this);

                int (*unwind) (call_frame_t *frame, xlator_t *this);

                /* post-op hook */
        } transaction;

        afr_self_heal_t self_heal;

        struct marker_str     marker;

        /* extra data for fops */
        dict_t         *xdata_req;
        dict_t         *xdata_rsp;

        mode_t          umask;
        int             xflag;
        gf_boolean_t    do_discovery;
	struct afr_reply *replies;
} afr_local_t;

typedef enum {
        AFR_FD_NOT_OPENED,
        AFR_FD_OPENED,
        AFR_FD_OPENING
} afr_fd_open_status_t;

typedef struct {
        unsigned int *pre_op_done;
        afr_fd_open_status_t *opened_on; /* which subvolumes the fd is open on */
        unsigned int *pre_op_piggyback;

        unsigned int *lock_piggyback;
        unsigned int *lock_acquired;

        int flags;
        uint64_t up_count;   /* number of CHILD_UPs this fd has seen */
        uint64_t down_count; /* number of CHILD_DOWNs this fd has seen */

        int32_t last_tried;

        int  hit, miss;
        gf_boolean_t failed_over;
        struct list_head entries; /* needed for readdir failover */

        unsigned char *locked_on; /* which subvolumes locks have been successful */

	/* used for delayed-post-op optimization */
	pthread_mutex_t    delay_lock;
	gf_timer_t        *delay_timer;
	call_frame_t      *delay_frame;
        int               call_child;

	/* set if any write on this fd was a non stable write
	   (i.e, without O_SYNC or O_DSYNC)
	*/
	gf_boolean_t      witnessed_unstable_write;

	/* list of frames currently in progress */
	struct list_head  eager_locked;
} afr_fd_ctx_t;


/* try alloc and if it fails, goto label */
#define AFR_LOCAL_ALLOC_OR_GOTO(var, label) do {                    \
                var = mem_get0 (THIS->local_pool);                  \
                if (!var) {                                         \
                        gf_log (this->name, GF_LOG_ERROR,           \
                                "out of memory :(");                \
                        op_errno = ENOMEM;                          \
                        goto label;                                 \
                }                                                   \
        } while (0);


/* did a call fail due to a child failing? */
#define child_went_down(op_ret, op_errno) (((op_ret) < 0) &&            \
                                           ((op_errno == ENOTCONN) ||   \
                                            (op_errno == EBADFD)))

#define afr_fop_failed(op_ret, op_errno) ((op_ret) == -1)

/* have we tried all children? */
#define all_tried(i, count)  ((i) == (count) - 1)

int32_t
afr_set_dict_gfid (dict_t *dict, uuid_t gfid);

int
pump_command_reply (call_frame_t *frame, xlator_t *this);

int32_t
afr_notify (xlator_t *this, int32_t event, void *data, void *data2);

int
afr_init_entry_lockee (afr_entry_lockee_t *lockee, afr_local_t *local,
                       loc_t *loc, char *basename, int child_count);

void
afr_entry_lockee_cleanup (afr_internal_lock_t *int_lock);

int
afr_attempt_lock_recovery (xlator_t *this, int32_t child_index);

int
afr_save_locked_fd (xlator_t *this, fd_t *fd);

int
afr_mark_locked_nodes (xlator_t *this, fd_t *fd,
                       unsigned char *locked_nodes);

void
afr_set_lk_owner (call_frame_t *frame, xlator_t *this, void *lk_owner);

int
afr_set_lock_number (call_frame_t *frame, xlator_t *this);


loc_t *
lower_path (loc_t *l1, const char *b1, loc_t *l2, const char *b2);

int32_t
afr_unlock (call_frame_t *frame, xlator_t *this);

int
afr_nonblocking_entrylk (call_frame_t *frame, xlator_t *this);

int
afr_nonblocking_inodelk (call_frame_t *frame, xlator_t *this);

int
afr_blocking_lock (call_frame_t *frame, xlator_t *this);

int
afr_internal_lock_finish (call_frame_t *frame, xlator_t *this);

void
afr_lk_transfer_datalock (call_frame_t *dst, call_frame_t *src,
                          unsigned int child_count);

int pump_start (call_frame_t *frame, xlator_t *this);

int
__afr_fd_ctx_set (xlator_t *this, fd_t *fd);

int
afr_fd_ctx_set (xlator_t *this, fd_t *fd);

int32_t
afr_inode_get_read_ctx (xlator_t *this, inode_t *inode, int32_t *fresh_children);

void
afr_inode_set_read_ctx (xlator_t *this, inode_t *inode, int32_t read_child,
                        int32_t *fresh_children);

int
afr_build_parent_loc (loc_t *parent, loc_t *child, int32_t *op_errno);

unsigned int
afr_up_children_count (unsigned char *child_up, unsigned int child_count);

unsigned int
afr_locked_children_count (unsigned char *children, unsigned int child_count);

unsigned int
afr_pre_op_done_children_count (unsigned char *pre_op,
                                unsigned int child_count);

gf_boolean_t
afr_is_fresh_lookup (loc_t *loc, xlator_t *this);

void
afr_update_loc_gfids (loc_t *loc, struct iatt *buf, struct iatt *postparent);

int
afr_locked_nodes_count (unsigned char *locked_nodes, int child_count);

void
afr_local_cleanup (afr_local_t *local, xlator_t *this);

int
afr_frame_return (call_frame_t *frame);

gf_boolean_t
afr_is_split_brain (xlator_t *this, inode_t *inode);

void
afr_set_split_brain (xlator_t *this, inode_t *inode, afr_spb_state_t mdata_spb,
                     afr_spb_state_t data_spb);

int
afr_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
          fd_t *fd, dict_t *xdata);

void
afr_set_opendir_done (xlator_t *this, inode_t *inode);

gf_boolean_t
afr_is_opendir_done (xlator_t *this, inode_t *inode);

void
afr_local_transaction_cleanup (afr_local_t *local, xlator_t *this);

int
afr_cleanup_fd_ctx (xlator_t *this, fd_t *fd);

int
afr_launch_openfd_self_heal (call_frame_t *frame, xlator_t *this, fd_t *fd);

#define AFR_STACK_UNWIND(fop, frame, params ...)                \
        do {                                                    \
                afr_local_t *__local = NULL;                    \
                xlator_t    *__this = NULL;                     \
                if (frame) {                                    \
                        __local = frame->local;                 \
                        __this = frame->this;                   \
                        frame->local = NULL;                    \
                }                                               \
                STACK_UNWIND_STRICT (fop, frame, params);       \
                if (__local) {                                  \
                        afr_local_cleanup (__local, __this);    \
                        mem_put (__local);                      \
                }                                               \
        } while (0)

#define AFR_STACK_DESTROY(frame)                                \
        do {                                                    \
                afr_local_t *__local = NULL;                    \
                xlator_t    *__this = NULL;                     \
                __local = frame->local;                         \
                __this = frame->this;                           \
                frame->local = NULL;                            \
                STACK_DESTROY (frame->root);                    \
                if (__local) {                                  \
                        afr_local_cleanup (__local, __this);    \
                        mem_put (__local);                      \
                }                                               \
        } while (0);

#define AFR_NUM_CHANGE_LOGS            3 /*data + metadata + entry*/
/* allocate and return a string that is the basename of argument */
static inline char *
AFR_BASENAME (const char *str)
{
        char *__tmp_str = NULL;
        char *__basename_str = NULL;
        __tmp_str = gf_strdup (str);
        __basename_str = gf_strdup (basename (__tmp_str));
        GF_FREE (__tmp_str);
        return __basename_str;
}

int
afr_transaction_local_init (afr_local_t *local, xlator_t *this);

int32_t
afr_marker_getxattr (call_frame_t *frame, xlator_t *this,
                     loc_t *loc, const char *name,afr_local_t *local, afr_private_t *priv );

int32_t *
afr_children_create (int32_t child_count);

int
afr_local_init (afr_local_t *local, afr_private_t *priv, int32_t *op_errno);

int
afr_internal_lock_init (afr_internal_lock_t *lk, size_t child_count,
                        transaction_lk_type_t lk_type);

int
afr_first_up_child (unsigned char *child_up, size_t child_count);

int
afr_select_read_child_from_policy (int32_t *fresh_children, int32_t child_count,
                                   int32_t prev_read_child,
                                   int32_t config_read_child, int32_t *sources,
                                   unsigned int hmode, uuid_t gfid);

void
afr_set_read_ctx_from_policy (xlator_t *this, inode_t *inode,
                              int32_t *fresh_children, int32_t prev_read_child,
                              int32_t config_read_child, uuid_t gfid);

int32_t
afr_get_call_child (xlator_t *this, unsigned char *child_up, int32_t read_child,
                    int32_t *fresh_children,
                    int32_t *call_child, int32_t *last_index);

int32_t
afr_next_call_child (int32_t *fresh_children, unsigned char *child_up,
                     size_t child_count, int32_t *last_index,
                     int32_t read_child);
void
afr_get_fresh_children (int32_t *success_children, int32_t *sources,
                        int32_t *children, unsigned int child_count);
void
afr_children_add_child (int32_t *children, int32_t child,
                              int32_t child_count);
void
afr_children_rm_child (int32_t *children, int32_t child,
                             int32_t child_count);
void
afr_reset_children (int32_t *children, int32_t child_count);
int32_t
afr_most_important_error(int32_t old_errno, int32_t new_errno,
			 gf_boolean_t eio);
int
afr_errno_count (int32_t *children, int *child_errno,
                 unsigned int child_count, int32_t op_errno);
int
afr_get_children_count (int32_t *children, unsigned int child_count);
gf_boolean_t
afr_is_child_present (int32_t *success_children, int32_t child_count,
                      int32_t child);
void
afr_update_gfid_from_iatts (uuid_t uuid, struct iatt *bufs,
                            int32_t *success_children,
                            unsigned int child_count);
void
afr_reset_xattr (dict_t **xattr, unsigned int child_count);
gf_boolean_t
afr_conflicting_iattrs (struct iatt *bufs, int32_t *success_children,
                        unsigned int child_count, const char *path,
                        const char *xlator_name);
unsigned int
afr_gfid_missing_count (const char *xlator_name, int32_t *children,
                        struct iatt *bufs, unsigned int child_count,
                        const char *path);
void
afr_xattr_req_prepare (xlator_t *this, dict_t *xattr_req, const char *path);
void
afr_children_copy (int32_t *dst, int32_t *src, unsigned int child_count);
afr_transaction_type
afr_transaction_type_get (ia_type_t ia_type);
int32_t
afr_resultant_errno_get (int32_t *children,
                         int *child_errno, unsigned int child_count);
void
afr_inode_rm_stale_children (xlator_t *this, inode_t *inode,
                             int32_t *stale_children);
void
afr_launch_self_heal (call_frame_t *frame, xlator_t *this, inode_t *inode,
                      gf_boolean_t background, ia_type_t ia_type, char *reason,
                      void (*gfid_sh_success_cbk) (call_frame_t *sh_frame,
                                                   xlator_t *this),
                      int (*unwind) (call_frame_t *frame, xlator_t *this,
                                     int32_t op_ret, int32_t op_errno,
                                     int32_t sh_failed));
void
afr_fix_open (xlator_t *this, fd_t *fd, size_t need_open_count, int *need_open);

void
afr_open_fd_fix (fd_t *fd, xlator_t *this);
int
afr_set_elem_count_get (unsigned char *elems, int child_count);

afr_fd_ctx_t *
afr_fd_ctx_get (fd_t *fd, xlator_t *this);

gf_boolean_t
afr_open_only_data_self_heal (char *data_self_heal);

gf_boolean_t
afr_data_self_heal_enabled (char *data_self_heal);

void
afr_set_low_priority (call_frame_t *frame);
int
afr_child_fd_ctx_set (xlator_t *this, fd_t *fd, int32_t child,
                      int flags);

gf_boolean_t
afr_have_quorum (char *logname, afr_private_t *priv);

void
afr_matrix_cleanup (int32_t **pending, unsigned int m);

int32_t**
afr_matrix_create (unsigned int m, unsigned int n);

gf_boolean_t
afr_is_errno_set (int *child_errno, int child);

gf_boolean_t
afr_is_errno_unset (int *child_errno, int child);

gf_boolean_t
afr_is_fd_fixable (fd_t *fd);

void
afr_prepare_new_entry_pending_matrix (int32_t **pending,
                                      gf_boolean_t (*is_pending) (int *, int),
                                      int *ctx, struct iatt *buf,
                                      unsigned int child_count);
void
afr_xattr_array_destroy (dict_t **xattr, unsigned int child_count);
/*
 * Special value indicating we should use the "auto" quorum method instead of
 * a fixed value (including zero to turn off quorum enforcement).
 */
#define AFR_QUORUM_AUTO INT_MAX

/*
 * Having this as a macro will make debugging a bit weirder, but does reduce
 * the probability of functions handling this check inconsistently.
 */
#define QUORUM_CHECK(_func,_label) do {                                  \
        if (priv->quorum_count && !afr_have_quorum(this->name,priv)) { \
                gf_log(this->name,GF_LOG_WARNING,                        \
                       "failing "#_func" due to lack of quorum");        \
                op_errno = EROFS;                                        \
                goto _label;                                             \
        }                                                                \
} while (0);


int
afr_fd_report_unstable_write (xlator_t *this, fd_t *fd);

gf_boolean_t
afr_fd_has_witnessed_unstable_write (xlator_t *this, fd_t *fd);

void
afr_delayed_changelog_wake_resume (xlator_t *this, fd_t *fd, call_stub_t *stub);

#endif /* __AFR_H__ */