summaryrefslogtreecommitdiffstats
path: root/xlators/performance/nl-cache/src/nl-cache.c
blob: 575b1e76d59549d9caf205a08c764bd250350eaf (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
/*
 *   Copyright (c) 2016 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.
 */


#include "nl-cache.h"
#include "statedump.h"
#include "upcall-utils.h"

static void
nlc_dentry_op (call_frame_t *frame, xlator_t *this, gf_boolean_t multilink)
{
        nlc_local_t *local = frame->local;

        GF_VALIDATE_OR_GOTO (this->name, local, out);

        switch (local->fop) {
        case GF_FOP_MKDIR:
                nlc_set_dir_state (this, local->loc.inode, NLC_PE_FULL);
                /*fall-through*/
        case GF_FOP_MKNOD:
        case GF_FOP_CREATE:
        case GF_FOP_SYMLINK:
                nlc_dir_add_pe (this, local->loc.parent, local->loc.inode,
                                local->loc.name);
                break;
        case GF_FOP_LINK:
                nlc_dir_add_pe (this, local->loc2.parent, NULL,
                                local->loc2.name);
                break;
        case GF_FOP_RMDIR:
                nlc_inode_clear_cache (this, local->loc.inode, _gf_false);
                /*fall-through*/
        case GF_FOP_UNLINK:
                nlc_dir_remove_pe (this, local->loc.parent, local->loc.inode,
                                   local->loc.name, multilink);
                break;
        case GF_FOP_RENAME:
                /* TBD: Should these be atomic ?  In case of rename, the
                 * newloc->inode can be NULL, and hence use oldloc->inode */
                nlc_dir_remove_pe (this, local->loc2.parent, local->loc2.inode,
                                   local->loc2.name, _gf_false);

                /*TODO: Remove old dentry from destination before adding this pe*/
                nlc_dir_add_pe (this, local->loc.parent, local->loc2.inode,
                                local->loc.name);

        default:
                return;
        }

        nlc_lru_prune (this, NULL);
out:
        return;
}

#define NLC_FOP(_name, _op, loc1, loc2, frame, this, args ...)  do {    \
        nlc_local_t      *__local   = NULL;                             \
        nlc_conf_t       *conf      = NULL;                             \
                                                                        \
        conf = this->private;                                           \
                                                                        \
        if (!IS_PEC_ENABLED (conf))                                     \
                goto disabled;                                          \
                                                                        \
        __local = nlc_local_init (frame, this, _op, loc1, loc2);        \
        GF_VALIDATE_OR_GOTO (this->name, __local, err);                 \
                                                                        \
        STACK_WIND (frame, nlc_##_name##_cbk,                           \
                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->_name,  \
                    args);                                              \
        break;                                                          \
disabled:                                                               \
        default_##_name##_resume (frame, this, args);                   \
        break;                                                          \
err:                                                                    \
        default_##_name##_failure_cbk (frame, ENOMEM);                  \
        break;                                                          \
} while (0)

#define NLC_FOP_CBK(_name, multilink, frame, cookie, this, op_ret, op_errno, \
                    args ...) do {                                      \
        nlc_conf_t  *conf  = NULL;                                      \
                                                                        \
        if (op_ret != 0)                                                \
                goto out;                                               \
                                                                        \
        conf = this->private;                                           \
                                                                        \
        if (op_ret < 0 || !IS_PEC_ENABLED (conf))                       \
                goto out;                                               \
        nlc_dentry_op (frame, this, multilink);                         \
out:                                                                    \
        NLC_STACK_UNWIND (_name, frame, op_ret, op_errno, args);        \
} while (0)

static int32_t
nlc_rename_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int32_t op_ret, int32_t op_errno, struct iatt *buf,
                struct iatt *preoldparent, struct iatt *postoldparent,
                struct iatt *prenewparent, struct iatt *postnewparent,
                dict_t *xdata)
{
        NLC_FOP_CBK (rename, _gf_false, frame, cookie, this, op_ret, op_errno,
                     buf, preoldparent, postoldparent, prenewparent,
                     postnewparent, xdata);
        return 0;
}


static int32_t
nlc_rename (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc,
            dict_t *xdata)
{
        NLC_FOP (rename, GF_FOP_RENAME, newloc, oldloc, frame, this, oldloc,
                 newloc, xdata);
        return 0;
}


static int32_t
nlc_mknod_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
               int32_t op_errno, inode_t *inode, struct iatt *buf,
               struct iatt *preparent, struct iatt *postparent, dict_t *xdata)
{
        NLC_FOP_CBK(mknod, _gf_false, frame, cookie, this, op_ret, op_errno,
                    inode, buf, preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc,
           mode_t mode, dev_t rdev, mode_t umask,
           dict_t *xdata)
{
        NLC_FOP(mknod, GF_FOP_MKNOD, loc, NULL, frame, this, loc, mode, rdev,
                umask, xdata);
        return 0;
}

static int32_t
nlc_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int32_t op_ret, int32_t op_errno, fd_t *fd, inode_t *inode,
                struct iatt *buf, struct iatt *preparent,
                struct iatt *postparent, dict_t *xdata)
{
        NLC_FOP_CBK (create, _gf_false, frame, cookie, this, op_ret, op_errno,
                     fd, inode, buf, preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
            mode_t mode, mode_t umask, fd_t *fd, dict_t *xdata)
{
        NLC_FOP (create, GF_FOP_CREATE, loc, NULL, frame, this, loc, flags,
                 mode, umask, fd, xdata);
        return 0;
}

static int32_t
nlc_mkdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
               int32_t op_errno, inode_t *inode, struct iatt *buf,
               struct iatt *preparent, struct iatt *postparent, dict_t *xdata)
{
        NLC_FOP_CBK (mkdir, _gf_false, frame, cookie, this, op_ret, op_errno,
                     inode, buf, preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
           mode_t umask, dict_t *xdata)
{
        NLC_FOP (mkdir, GF_FOP_MKDIR, loc, NULL, frame, this, loc, mode,
                 umask, xdata);
        return 0;
}


static int32_t
nlc_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int32_t op_ret, int32_t op_errno, inode_t *inode,
                struct iatt *buf, dict_t *xdata, struct iatt *postparent)
{
        nlc_local_t *local = NULL;
        nlc_conf_t  *conf  = NULL;

        local = frame->local;
        conf = this->private;

        if (!local)
                goto out;

        /* Donot add to pe, this may lead to duplicate entry and
         * requires search before adding if list of strings */
        if (op_ret < 0 && op_errno == ENOENT) {
                nlc_dir_add_ne (this, local->loc.parent, local->loc.name);
                GF_ATOMIC_INC (conf->nlc_counter.nlc_miss);
        }

out:
        NLC_STACK_UNWIND (lookup, frame, op_ret, op_errno, inode, buf, xdata,
                          postparent);
        return 0;
}


static int32_t
nlc_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
{
        nlc_local_t *local = NULL;
        nlc_conf_t  *conf  = NULL;
        inode_t     *inode = NULL;

        if (loc_is_nameless (loc))
                goto wind;

        local = nlc_local_init (frame, this, GF_FOP_LOOKUP, loc, NULL);
        if (!local)
                goto err;

        conf = this->private;

        inode = inode_grep (loc->inode->table, loc->parent, loc->name);
        if (inode) {
                inode_unref (inode);
                goto wind;
        }

        if (nlc_is_negative_lookup (this, loc)) {
                GF_ATOMIC_INC (conf->nlc_counter.nlc_hit);
                gf_msg_trace (this->name, 0, "Serving negative lookup from "
                              "cache:%s", loc->name);
                goto unwind;
        }

wind:
        STACK_WIND (frame, nlc_lookup_cbk,
                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->lookup,
                    loc, xdata);
        return 0;
unwind:
        NLC_STACK_UNWIND (lookup, frame, -1, ENOENT, NULL, NULL, NULL, NULL);
        return 0;
err:
        NLC_STACK_UNWIND (lookup, frame, -1, ENOMEM, NULL, NULL, NULL, NULL);
        return 0;
}

static int32_t
nlc_rmdir_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
               int32_t op_ret, int32_t op_errno, struct iatt *preparent,
               struct iatt *postparent, dict_t *xdata)
{
        NLC_FOP_CBK (rmdir, _gf_false, frame, cookie, this, op_ret, op_errno,
                     preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
           dict_t *xdata)
{
        NLC_FOP (rmdir, GF_FOP_RMDIR, loc, NULL, frame, this, loc, flags,
                 xdata);
        return 0;
}


static int32_t
nlc_getxattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                  int32_t op_ret, int32_t op_errno, dict_t *dict,
                  dict_t *xdata)
{
        nlc_conf_t  *conf  = NULL;

        conf = this->private;
        GF_VALIDATE_OR_GOTO (this->name, conf, out);

        if (!IS_PEC_ENABLED (conf))
                goto out;

        if (op_ret < 0 && op_errno == ENOENT) {
                GF_ATOMIC_INC (conf->nlc_counter.getrealfilename_miss);
        }

out:
        NLC_STACK_UNWIND (getxattr, frame, op_ret, op_errno, dict, xdata);
        return 0;
}


static int32_t
nlc_getxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, const char *key,
              dict_t *xdata)
{
        int32_t               op_ret                = -1;
        int32_t               op_errno              = 0;
        dict_t               *dict                  = NULL;
        nlc_local_t           *local                 = NULL;
        gf_boolean_t          hit                   = _gf_false;
        const char           *fname                 = NULL;
        nlc_conf_t            *conf                  = NULL;

        conf = this->private;

        if (!IS_PEC_ENABLED (conf))
                goto wind;

        if (!key || (strncmp (key, GF_XATTR_GET_REAL_FILENAME_KEY,
                     strlen (GF_XATTR_GET_REAL_FILENAME_KEY)) != 0))
                goto wind;

        local = nlc_local_init (frame, this, GF_FOP_GETXATTR, loc, NULL);
        if (!local)
                goto err;

        if (loc->inode && key) {
                dict = dict_new ();
                if (!dict)
                        goto err;

                fname = key + strlen (GF_XATTR_GET_REAL_FILENAME_KEY);
                hit = nlc_get_real_file_name (this, loc, fname, &op_ret,
                                             &op_errno, dict);
                if (hit)
                        goto unwind;
                else
                        dict_unref (dict);
        }

        STACK_WIND (frame, nlc_getxattr_cbk,
                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->getxattr,
                    loc, key, xdata);
        return 0;
wind:
        STACK_WIND (frame, default_getxattr_cbk,
                    FIRST_CHILD(this), FIRST_CHILD(this)->fops->getxattr,
                    loc, key, xdata);
        return 0;
unwind:
        GF_ATOMIC_INC (conf->nlc_counter.getrealfilename_hit);
        NLC_STACK_UNWIND (getxattr, frame, op_ret, op_errno, dict, NULL);
        dict_unref (dict);
        return 0;
err:
        NLC_STACK_UNWIND (getxattr, frame, -1, ENOMEM, NULL, NULL);
        return 0;
}


static int32_t
nlc_symlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                 int32_t op_ret, int32_t op_errno, inode_t *inode,
                 struct iatt *buf, struct iatt *preparent,
                 struct iatt *postparent, dict_t *xdata)
{
        NLC_FOP_CBK (symlink, _gf_false, frame, cookie, this, op_ret, op_errno,
                     inode, buf, preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_symlink (call_frame_t *frame, xlator_t *this, const char *linkpath,
             loc_t *loc, mode_t umask, dict_t *xdata)
{
        NLC_FOP (symlink, GF_FOP_SYMLINK, loc, NULL, frame, this, linkpath,
                 loc, umask, xdata);
        return 0;
}


static int32_t
nlc_link_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
              int32_t op_errno, inode_t *inode, struct iatt *buf,
              struct iatt *preparent, struct iatt *postparent, dict_t *xdata)
{
        NLC_FOP_CBK (link, _gf_false, frame, cookie, this, op_ret, op_errno,
                     inode, buf, preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_link (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc,
          dict_t *xdata)
{
        NLC_FOP (link, GF_FOP_LINK, oldloc, newloc, frame, this, oldloc,
                 newloc, xdata);
        return 0;
}


static int32_t
nlc_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                int32_t op_ret, int32_t op_errno, struct iatt *preparent,
                struct iatt *postparent, dict_t *xdata)
{
        uint32_t    link_count = 0;
        gf_boolean_t multilink = _gf_false;

        if (xdata && !dict_get_uint32 (xdata, GET_LINK_COUNT, &link_count)) {
                if (link_count > 1)
                        multilink = _gf_true;
        } else {
                /* Don't touch cache if we don't know enough */
                gf_msg (this->name, GF_LOG_WARNING, 0, NLC_MSG_DICT_FAILURE,
                        "Failed to get GET_LINK_COUNT from dict");
                NLC_STACK_UNWIND (unlink, frame, op_ret, op_errno, preparent,
                                  postparent, xdata);
                return 0;
        }

        NLC_FOP_CBK (unlink, multilink, frame, cookie, this, op_ret, op_errno,
                     preparent, postparent, xdata);
        return 0;
}


static int32_t
nlc_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
            dict_t *xdata)
{
        nlc_conf_t   *conf     = NULL;
        gf_boolean_t new_dict = _gf_false;

        conf = this->private;

        if (!IS_PEC_ENABLED (conf))
                goto do_fop;

        if (!xdata) {
                xdata = dict_new ();
                if (xdata)
                        new_dict = _gf_true;
        }

        if (xdata && dict_set_uint32 (xdata, GET_LINK_COUNT, 0)) {
                gf_msg (this->name, GF_LOG_WARNING, 0, NLC_MSG_DICT_FAILURE,
                        "Failed to set GET_LINK_COUNT in dict");
                goto err;
        }

do_fop:
        NLC_FOP (unlink, GF_FOP_UNLINK, loc, NULL, frame, this, loc, flags,
                 xdata);

        if (new_dict)
                dict_unref (xdata);
        return 0;
}


static int32_t
nlc_invalidate (xlator_t *this, void *data)
{
        struct gf_upcall                    *up_data    = NULL;
        struct gf_upcall_cache_invalidation *up_ci      = NULL;
        inode_t                             *inode      = NULL;
        inode_t                             *parent1    = NULL;
        inode_t                             *parent2    = NULL;
        int                                  ret        = 0;
        inode_table_t                       *itable     = NULL;
        nlc_conf_t                          *conf       = NULL;

        up_data = (struct gf_upcall *)data;

        if (up_data->event_type != GF_UPCALL_CACHE_INVALIDATION)
                goto out;

        conf = this->private;
        if (!conf)
                 goto out;

        up_ci = (struct gf_upcall_cache_invalidation *)up_data->data;

        /*TODO: Add he inodes found as a member in gf_upcall_cache_invalidation
         * so that it prevents subsequent xlators from doing inode_find again
         */
        itable = ((xlator_t *)this->graph->top)->itable;
        inode = inode_find (itable, up_data->gfid);
        if (!inode) {
                ret = -1;
                goto out;
        }

        if ((!((up_ci->flags & UP_TIMES) && inode->ia_type == IA_IFDIR)) &&
            (!(up_ci->flags & UP_PARENT_DENTRY_FLAGS))) {
                goto out;
        }

        if (!gf_uuid_is_null (up_ci->p_stat.ia_gfid)) {
                parent1 = inode_find (itable, up_ci->p_stat.ia_gfid);
                if (!parent1) {
                        ret = -1;
                        goto out;
                }
        }

        if (!gf_uuid_is_null (up_ci->oldp_stat.ia_gfid)) {
                parent2 = inode_find (itable, up_ci->oldp_stat.ia_gfid);
                if (!parent2) {
                        ret = -1;
                        goto out;
                }
        }

        /* TODO: get enough data in upcall so that we do not invalidate but
         * update */
        if (inode && inode->ia_type == IA_IFDIR)
                nlc_inode_clear_cache (this, inode, NLC_NONE);
        if (parent1)
                nlc_inode_clear_cache (this, parent1, NLC_NONE);
        if (parent2)
                nlc_inode_clear_cache (this, parent2, NLC_NONE);

        GF_ATOMIC_INC (conf->nlc_counter.nlc_invals);

out:
        if (inode)
                inode_unref (inode);
        if (parent1)
                inode_unref (parent1);
        if (parent2)
                inode_unref (parent2);

        return ret;
}


int
notify (xlator_t *this, int event, void *data, ...)
{
        int        ret  = 0;
        time_t     now  = 0;

        switch (event) {
        case GF_EVENT_CHILD_DOWN:
        case GF_EVENT_SOME_DESCENDENT_DOWN:
        case GF_EVENT_CHILD_UP:
        case GF_EVENT_SOME_DESCENDENT_UP:
                time (&now);
                nlc_update_child_down_time (this, &now);
                /* TODO: nlc_clear_all_cache (this); else
                 lru prune will lazily clear it*/
                break;
        case GF_EVENT_UPCALL:
                ret = nlc_invalidate (this, data);
                break;
        case GF_EVENT_PARENT_DOWN:
                nlc_disable_cache (this);
                nlc_clear_all_cache (this);
        default:
                break;
        }

        if (default_notify (this, event, data) != 0)
                ret = -1;

        return ret;
}


static int32_t
nlc_forget (xlator_t *this, inode_t *inode)
{
        uint64_t         pe_int      = 0;
        uint64_t         nlc_ctx_int = 0;
        nlc_ctx_t       *nlc_ctx     = NULL;
        nlc_conf_t      *conf        = NULL;

        conf = this->private;

        inode_ctx_reset1 (inode, this, &pe_int);
        GF_ASSERT (pe_int == 0);

        nlc_inode_clear_cache (this, inode, NLC_NONE);
        inode_ctx_reset0 (inode, this, &nlc_ctx_int);
        nlc_ctx = (void *) (long) nlc_ctx_int;
        if (nlc_ctx) {
                GF_FREE (nlc_ctx);
                GF_ATOMIC_SUB (conf->current_cache_size, sizeof (*nlc_ctx));
        }

        return 0;
}


static int32_t
nlc_inodectx (xlator_t *this, inode_t *inode)
{
        nlc_dump_inodectx (this, inode);
        return 0;
}


static int32_t
nlc_priv_dump (xlator_t *this)
{
        nlc_conf_t *conf = NULL;
        char  key_prefix[GF_DUMP_MAX_BUF_LEN];

        conf = this->private;

        snprintf(key_prefix, GF_DUMP_MAX_BUF_LEN, "%s.%s", this->type, this->name);
        gf_proc_dump_add_section(key_prefix);

        gf_proc_dump_write("negative_lookup_hit_count", "%"PRId64,
                           GF_ATOMIC_GET(conf->nlc_counter.nlc_hit));
        gf_proc_dump_write("negative_lookup_miss_count", "%"PRId64,
                           GF_ATOMIC_GET(conf->nlc_counter.nlc_miss));
        gf_proc_dump_write("get_real_filename_hit_count", "%"PRId64,
                         GF_ATOMIC_GET(conf->nlc_counter.getrealfilename_hit));
        gf_proc_dump_write("get_real_filename_miss_count", "%"PRId64,
                        GF_ATOMIC_GET(conf->nlc_counter.getrealfilename_miss));
        gf_proc_dump_write("nameless_lookup_count", "%"PRId64,
                           GF_ATOMIC_GET(conf->nlc_counter.nameless_lookup));
        gf_proc_dump_write("inodes_with_positive_dentry_cache", "%"PRId64,
                           GF_ATOMIC_GET(conf->nlc_counter.pe_inode_cnt));
        gf_proc_dump_write("inodes_with_negative_dentry_cache", "%"PRId64,
                           GF_ATOMIC_GET(conf->nlc_counter.ne_inode_cnt));
        gf_proc_dump_write("dentry_invalidations_recieved", "%"PRId64,
                           GF_ATOMIC_GET(conf->nlc_counter.nlc_invals));
        gf_proc_dump_write("cache_limit", "%"PRIu64,
                           conf->cache_size);
        gf_proc_dump_write("consumed_cache_size", "%"PRId64,
                           GF_ATOMIC_GET(conf->current_cache_size));
        gf_proc_dump_write("inode_limit", "%"PRIu64,
                           conf->inode_limit);
        gf_proc_dump_write("consumed_inodes", "%"PRId64,
                           GF_ATOMIC_GET(conf->refd_inodes));

        return 0;
}


void
fini (xlator_t *this)
{
        nlc_conf_t      *conf       = NULL;

        conf = this->private;
        GF_FREE (conf);

        glusterfs_ctx_tw_put (this->ctx);

        return;
}


int32_t
mem_acct_init (xlator_t *this)
{
        int     ret = -1;

        ret = xlator_mem_acct_init (this, gf_nlc_mt_end + 1);
        return ret;
}


int32_t
reconfigure (xlator_t *this, dict_t *options)
{
        nlc_conf_t *conf = NULL;

        conf = this->private;

        GF_OPTION_RECONF ("nl-cache-timeout", conf->cache_timeout, options,
                          int32, out);
        GF_OPTION_RECONF ("nl-cache-positive-entry", conf->positive_entry_cache,
                          options, bool, out);
        GF_OPTION_RECONF ("nl-cache-limit", conf->cache_size, options,
                          size_uint64, out);

out:
        return 0;
}


int32_t
init (xlator_t *this)
{
        nlc_conf_t      *conf       = NULL;
        int              ret        = -1;
        inode_table_t   *itable     = NULL;

        conf = GF_CALLOC (sizeof (*conf), 1, gf_nlc_mt_nlc_conf_t);
        if (!conf)
                goto out;

        GF_OPTION_INIT ("nl-cache-timeout", conf->cache_timeout, int32, out);
        GF_OPTION_INIT ("nl-cache-positive-entry", conf->positive_entry_cache,
                        bool, out);
        GF_OPTION_INIT ("nl-cache-limit", conf->cache_size, size_uint64, out);

        /* Since the positive entries are stored as list of refs on
         * existing inodes, we should not overflow the inode lru_limit.
         * Hence keep the limit of inodes that are refed by this xlator,
         * to 80% of inode_table->lru_limit. In fuse where the limit is
         * infinite, take 131072 as lru limit (as in gfapi). */
        itable = ((xlator_t *)this->graph->top)->itable;
        if (itable && itable->lru_limit)
                conf->inode_limit = itable->lru_limit * 80 / 100;
        else
                conf->inode_limit = 131072 * 80 / 100;

        LOCK_INIT (&conf->lock);
        GF_ATOMIC_INIT (conf->current_cache_size, 0);
        GF_ATOMIC_INIT (conf->refd_inodes, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.nlc_hit, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.nlc_miss, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.nameless_lookup, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.getrealfilename_hit, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.getrealfilename_miss, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.pe_inode_cnt, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.ne_inode_cnt, 0);
        GF_ATOMIC_INIT (conf->nlc_counter.nlc_invals, 0);

        INIT_LIST_HEAD (&conf->lru);
        time (&conf->last_child_down);

        conf->timer_wheel = glusterfs_ctx_tw_get (this->ctx);
        if (!conf->timer_wheel) {
                gf_msg (this->name, GF_LOG_ERROR, 0, NLC_MSG_NO_TIMER_WHEEL,
                        "Initing the global timer wheel failed");
                        goto out;
        }

        this->private = conf;

        ret = 0;
out:
        return ret;
}


struct xlator_fops fops = {
        .rename               = nlc_rename,
        .mknod                = nlc_mknod,
        .create               = nlc_create,
        .mkdir                = nlc_mkdir,
        .lookup               = nlc_lookup,
        .rmdir                = nlc_rmdir,
        .getxattr             = nlc_getxattr,
        .symlink              = nlc_symlink,
        .link                 = nlc_link,
        .unlink               = nlc_unlink,
        /* TODO:
        .readdir              = nlc_readdir,
        .readdirp             = nlc_readdirp,
        .seek                 = nlc_seek,
        .opendir              = nlc_opendir, */
};


struct xlator_cbks cbks = {
        .forget               = nlc_forget,
};


struct xlator_dumpops dumpops = {
        .inodectx             = nlc_inodectx,
        .priv                 = nlc_priv_dump,
};

struct volume_options options[] = {
        { .key = {"nl-cache-positive-entry"},
          .type = GF_OPTION_TYPE_BOOL,
          .default_value = "false",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_SETTABLE | OPT_FLAG_CLIENT_OPT | OPT_FLAG_DOC,
          .description = "Cache the name of the files/directories that was"
                         " looked up and are present in a directory",
        },
        { .key = {"nl-cache-limit"},
          .type = GF_OPTION_TYPE_SIZET,
          .min = 0,
          .default_value = "131072",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_SETTABLE | OPT_FLAG_CLIENT_OPT | OPT_FLAG_DOC,
          .description = "the value over which caching will be disabled for"
                         "a while and the cache is cleared based on LRU",
        },
        { .key = {"nl-cache-timeout"},
          .type = GF_OPTION_TYPE_TIME,
          .min = 0,
          .default_value = "60",
          .op_version = {GD_OP_VERSION_3_11_0},
          .flags = OPT_FLAG_SETTABLE | OPT_FLAG_CLIENT_OPT | OPT_FLAG_DOC,
          .description = "Time period after which cache has to be refreshed",
        },
        { .key = {NULL} },
};