summaryrefslogtreecommitdiffstats
path: root/xlators/cluster/afr/src/afr.h
blob: a6ca1c2be9de1086beb6e9ee9c180cb6c7aeedf9 (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
/*
   Copyright (c) 2008-2009 Gluster, Inc. <http://www.gluster.com>
   This file is part of GlusterFS.

   GlusterFS is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3 of the License,
   or (at your option) any later version.

   GlusterFS is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see
   <http://www.gnu.org/licenses/>.
*/


#ifndef __AFR_H__
#define __AFR_H__

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

#include "scheduler.h"
#include "call-stub.h"
#include "compat-errno.h"

#define AFR_XATTR_PREFIX "trusted.afr"

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;

	unsigned char *child_up;

        char **pending_key;

	gf_boolean_t data_self_heal;              /* on/off */
        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 favorite_child;  /* subvolume to be preferred in resolving
					 split-brain cases */

	unsigned int data_lock_server_count;
	unsigned int metadata_lock_server_count;
	unsigned int entry_lock_server_count;

	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 */
} afr_private_t;

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

        gf_boolean_t need_data_self_heal;
        gf_boolean_t need_metadata_self_heal;
        gf_boolean_t need_entry_self_heal;

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

        gf_boolean_t healing_fd_opened;   /* true if caller has already
                                             opened fd */

        gf_boolean_t data_lock_held;      /* true if caller has already
                                             acquired 0-0 lock */

	fd_t *healing_fd;                 /* set if callers has opened fd */

        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 */

        /* 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);

        /* End of external interface members */


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

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

	/* array of errno's, one for each child */
	int *child_errno;

	int32_t **pending_matrix;
	int32_t **delta_matrix;

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

        mode_t impunging_entry_mode;
        const char *linkname;

	int   op_failed;

	int   file_has_holes;
	blksize_t block_size;
	off_t file_size;
	off_t offset;

	loc_t parent_loc;

        call_frame_t *orig_frame;
        gf_boolean_t unwound;

        /* private data for the particular self-heal algorithm */
        void *private;

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

	int (*completion_cbk) (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);

	call_frame_t *sh_frame;
} 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_FLUSH_TRANSACTION,         /* flush */
} afr_transaction_type;


/*
  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:
        case AFR_FLUSH_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 enum {
        AFR_CHILD_UP_FLUSH,
        AFR_CHILD_DOWN_FLUSH,
} afr_flush_type;


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

	unsigned int govinda_gOvinda;

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

        pid_t saved_pid;

	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 *child_errno;
	
	dict_t  *xattr_req;
	int      open_fd_count;

	int32_t  inodelk_count;
	int32_t  entrylk_count;

        int (*up_down_flush_cbk) (call_frame_t *, xlator_t *);

	/* 
	   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 {
			inode_t *inode;
			struct iatt buf;
                        struct iatt read_child_buf;
                        struct iatt postparent;
                        ino_t ino;
                        uint64_t gen;
                        ino_t parent_ino;
			dict_t *xattr;
			dict_t **xattrs;
                        gf_boolean_t is_revalidate;
		} lookup;

		struct {
			int32_t flags;
                        int32_t wbflags;
		} open;

		struct {
			int32_t cmd;
			struct flock flock;
			unsigned char *locked_nodes;
		} lk;

		struct {
			uint8_t *file_checksum;
			uint8_t *dir_checksum;
		} checksum;

		/* inode read */

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

		struct {
			int last_tried;
			ino_t ino;
		} stat;

		struct {
			int last_tried;
			ino_t ino;
		} fstat;

		struct {
			size_t size;
			int last_tried;
                        ino_t ino;
		} readlink;

		struct {
			const char *name;
			int last_tried;
		} getxattr;

		struct {
                        ino_t ino;
			size_t size;
			off_t offset;
			int last_tried;
		} 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;

                        gf_boolean_t failed;
			int last_tried;
		} readdir;

		struct {
			int32_t op_ret;
			int32_t op_errno;

			size_t size;
			off_t offset;
			int32_t flag;

			int last_tried;
		} getdents;

		/* inode write */

		struct {
			ino_t ino;
			struct iatt prebuf;
			struct iatt postbuf;

			int32_t op_ret;

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

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

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

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

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

		struct {
			ino_t ino;
			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 {
			const char *name;
		} removexattr;

		/* dir write */
		
		struct {
			ino_t ino;
                        uint64_t gen;
                        ino_t parent_ino;
			fd_t *fd;
			int32_t flags;
			mode_t mode;
			inode_t *inode;
			struct iatt buf;
                        struct iatt preparent;
                        struct iatt postparent;
                        struct iatt read_child_buf;
		} create;

		struct {
			ino_t ino;
                        uint64_t gen;
                        ino_t parent_ino;
			dev_t dev;
			mode_t mode;
			inode_t *inode;
			struct iatt buf;
                        struct iatt preparent;
                        struct iatt postparent;
                        struct iatt read_child_buf;
		} mknod;

		struct {
			ino_t ino;
                        uint64_t gen;
                        ino_t parent_ino;
			int32_t mode;
			inode_t *inode;
			struct iatt buf;
                        struct iatt read_child_buf;
                        struct iatt preparent;
                        struct iatt postparent;
		} mkdir;

		struct {
                        ino_t parent_ino;
			int32_t op_ret;
			int32_t op_errno;
                        struct iatt preparent;
                        struct iatt postparent;
		} unlink;

		struct {
                        ino_t parent_ino;
			int32_t op_ret;
			int32_t op_errno;
                        struct iatt preparent;
                        struct iatt postparent;
		} rmdir;

		struct {
                        ino_t oldparent_ino;
                        ino_t newparent_ino;
			ino_t ino;
			struct iatt buf;
                        struct iatt read_child_buf;
                        struct iatt preoldparent;
                        struct iatt prenewparent;
                        struct iatt postoldparent;
                        struct iatt postnewparent;
		} rename;

		struct {
			ino_t ino;
                        uint64_t gen;
                        ino_t parent_ino;
			inode_t *inode;
			struct iatt buf;
                        struct iatt read_child_buf;
                        struct iatt preparent;
                        struct iatt postparent;
		} link;

		struct {
			ino_t ino;
                        uint64_t gen;
                        ino_t parent_ino;
			inode_t *inode;
			struct iatt buf;
                        struct iatt read_child_buf;
			char *linkpath;
                        struct iatt preparent;
                        struct iatt postparent;
		} symlink;

		struct {
			int32_t flags;
			dir_entry_t *entries;
			int32_t count;
		} setdents;
	} cont;
	
	struct {
		off_t start, len;

		unsigned char *locked_nodes;
		int lock_count;

		const char *basename;
		const char *new_basename;

		loc_t parent_loc;
		loc_t new_parent_loc;

		afr_transaction_type type;

		int success_count;
		int erase_pending;
		int failure_count;

		int last_tried;
		int32_t *child_errno;

		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 */
                int (*post_post_op) (call_frame_t *frame, xlator_t *this);
	} transaction;

	afr_self_heal_t self_heal;
} afr_local_t;


typedef struct {
        unsigned char *pre_op_done;
        unsigned char *opened_on;     /* which subvolumes the fd is open on */
        unsigned char *child_failed;
        int flags;
        int32_t wbflags;
        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;
        gf_boolean_t failed_over;
        struct list_head entries; /* needed for readdir failover */
} afr_fd_ctx_t;


/* try alloc and if it fails, goto label */
#define ALLOC_OR_GOTO(var, type, label) do {			\
		var = CALLOC (sizeof (type), 1);		\
		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)

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

uint64_t
afr_read_child (xlator_t *this, inode_t *inode);

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

void
afr_build_parent_loc (loc_t *parent, loc_t *child);

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

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

ino64_t
afr_itransform (ino64_t ino, int child_count, int child_index);

int
afr_deitransform (ino64_t ino, int child_count);

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

int
afr_frame_return (call_frame_t *frame);

uint64_t
afr_is_split_brain (xlator_t *this, inode_t *inode);

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

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

int
afr_up_down_flush (call_frame_t *frame, xlator_t *this, fd_t *fd, afr_flush_type type);

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

uint64_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);

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

/* 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 = strdup (str);			
	__basename_str = strdup (basename (__tmp_str));	
	FREE (__tmp_str);
	return __basename_str;
}

/* initialize local_t */
static inline int
AFR_LOCAL_INIT (afr_local_t *local, afr_private_t *priv)
{
	local->child_up = CALLOC (sizeof (*local->child_up),
				  priv->child_count);
	if (!local->child_up) {
		return -ENOMEM;
	}

	memcpy (local->child_up, priv->child_up, 
		sizeof (*local->child_up) * priv->child_count);


	local->call_count = afr_up_children_count (priv->child_count, local->child_up);
	if (local->call_count == 0)
		return -ENOTCONN;

	local->transaction.erase_pending = 1;

	local->op_ret = -1;
	local->op_errno = EUCLEAN;

	return 0;
}


/**
 * first_up_child - return the index of the first child that is up
 */

static inline int
afr_first_up_child (afr_private_t *priv)
{
	xlator_t ** children = NULL;
	int         ret      = -1;
	int         i        = 0;

	LOCK (&priv->lock);
	{
		children = priv->children;
		for (i = 0; i < priv->child_count; i++) {
			if (priv->child_up[i]) {
				ret = i;
				break;
			}
		}
	}
	UNLOCK (&priv->lock);

	return ret;
}


static inline int
afr_transaction_local_init (afr_local_t *local, afr_private_t *priv)
{
        int i;

        local->first_up_child = afr_first_up_child (priv);

	local->child_errno = CALLOC (sizeof (*local->child_errno),
				     priv->child_count);
	if (!local->child_errno) {
		return -ENOMEM;
	}

	local->pending = CALLOC (sizeof (*local->pending),
                                 priv->child_count);
        
	if (!local->pending) {
		return -ENOMEM;
	}

        for (i = 0; i < priv->child_count; i++) {
                local->pending[i] = CALLOC (sizeof (*local->pending[i]),
                                            3); /* data + metadata + entry */
                if (!local->pending[i])
                        return -ENOMEM;
        }
        
	local->transaction.locked_nodes = CALLOC (sizeof (*local->transaction.locked_nodes),
						  priv->child_count);

	local->transaction.child_errno = CALLOC (sizeof (*local->transaction.child_errno),
						  priv->child_count);

	return 0;
}

#endif /* __AFR_H__ */