summaryrefslogtreecommitdiffstats
path: root/api/src/glfs-mgmt.c
blob: 2ead93863bcac90e7eeec769fd6e83d9de595fef (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
/*
  Copyright (c) 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.
*/


#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>

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

#include "glusterfs.h"
#include "stack.h"
#include "dict.h"
#include "event.h"
#include "defaults.h"

#include "rpc-clnt.h"
#include "protocol-common.h"
#include "glusterfs3.h"
#include "portmap-xdr.h"
#include "xdr-generic.h"

#include "syncop.h"
#include "xlator.h"

#include "glfs-internal.h"
#include "glfs-mem-types.h"


int glfs_volfile_fetch (struct glfs *fs);

int
glfs_process_volfp (struct glfs *fs, FILE *fp)
{
	glusterfs_graph_t  *graph = NULL;
	int		    ret = -1;
	xlator_t	   *trav = NULL;
	glusterfs_ctx_t	   *ctx = NULL;

	ctx = fs->ctx;
	graph = glusterfs_graph_construct (fp);
	if (!graph) {
		gf_log ("glfs", GF_LOG_ERROR, "failed to construct the graph");
		goto out;
	}

	for (trav = graph->first; trav; trav = trav->next) {
		if (strcmp (trav->type, "mount/fuse") == 0) {
			gf_log ("glfs", GF_LOG_ERROR,
				"fuse xlator cannot be specified "
				"in volume file");
			goto out;
		}
	}

	ret = glusterfs_graph_prepare (graph, ctx);
	if (ret) {
		glusterfs_graph_destroy (graph);
		goto out;
	}

	ret = glusterfs_graph_activate (graph, ctx);

	if (ret) {
		glusterfs_graph_destroy (graph);
		goto out;
	}

	ret = 0;
out:
	if (fp)
		fclose (fp);

	if (!ctx->active) {
		ret = -1;
	}

	return ret;
}


int
mgmt_cbk_spec (struct rpc_clnt *rpc, void *mydata, void *data)
{
	struct glfs *fs = NULL;
	xlator_t    *this = NULL;

	this = mydata;
	fs = this->private;

	glfs_volfile_fetch (fs);

	return 0;
}


int
mgmt_cbk_event (struct rpc_clnt *rpc, void *mydata, void *data)
{
	return 0;
}


rpcclnt_cb_actor_t gluster_cbk_actors[] = {
	[GF_CBK_FETCHSPEC] = {"FETCHSPEC", GF_CBK_FETCHSPEC, mgmt_cbk_spec },
	[GF_CBK_EVENT_NOTIFY] = {"EVENTNOTIFY", GF_CBK_EVENT_NOTIFY,
				 mgmt_cbk_event},
};


struct rpcclnt_cb_program mgmt_cbk_prog = {
	.progname  = "GlusterFS Callback",
	.prognum   = GLUSTER_CBK_PROGRAM,
	.progver   = GLUSTER_CBK_VERSION,
	.actors	   = gluster_cbk_actors,
	.numactors = GF_CBK_MAXVALUE,
};

char *clnt_handshake_procs[GF_HNDSK_MAXVALUE] = {
	[GF_HNDSK_NULL]		= "NULL",
	[GF_HNDSK_SETVOLUME]	= "SETVOLUME",
	[GF_HNDSK_GETSPEC]	= "GETSPEC",
	[GF_HNDSK_PING]		= "PING",
	[GF_HNDSK_EVENT_NOTIFY] = "EVENTNOTIFY",
};

rpc_clnt_prog_t clnt_handshake_prog = {
	.progname  = "GlusterFS Handshake",
	.prognum   = GLUSTER_HNDSK_PROGRAM,
	.progver   = GLUSTER_HNDSK_VERSION,
	.procnames = clnt_handshake_procs,
};


int
mgmt_submit_request (void *req, call_frame_t *frame,
		     glusterfs_ctx_t *ctx,
		     rpc_clnt_prog_t *prog, int procnum,
		     fop_cbk_fn_t cbkfn, xdrproc_t xdrproc)
{
	int			ret	    = -1;
	int			count	   = 0;
	struct iovec		iov	    = {0, };
	struct iobuf		*iobuf = NULL;
	struct iobref		*iobref = NULL;
	ssize_t			xdr_size = 0;

	iobref = iobref_new ();
	if (!iobref) {
		goto out;
	}

	if (req) {
		xdr_size = xdr_sizeof (xdrproc, req);

		iobuf = iobuf_get2 (ctx->iobuf_pool, xdr_size);
		if (!iobuf) {
			goto out;
		};

		iobref_add (iobref, iobuf);

		iov.iov_base = iobuf->ptr;
		iov.iov_len  = iobuf_pagesize (iobuf);

		/* Create the xdr payload */
		ret = xdr_serialize_generic (iov, req, xdrproc);
		if (ret == -1) {
			gf_log (THIS->name, GF_LOG_WARNING,
				"failed to create XDR payload");
			goto out;
		}
		iov.iov_len = ret;
		count = 1;
	}

	/* Send the msg */
	ret = rpc_clnt_submit (ctx->mgmt, prog, procnum, cbkfn,
			       &iov, count,
			       NULL, 0, iobref, frame, NULL, 0, NULL, 0, NULL);

out:
	if (iobref)
		iobref_unref (iobref);

	if (iobuf)
		iobuf_unref (iobuf);
	return ret;
}


static int
xlator_equal_rec (xlator_t *xl1, xlator_t *xl2)
{
	xlator_list_t *trav1 = NULL;
	xlator_list_t *trav2 = NULL;
	int	       ret   = 0;

	if (xl1 == NULL || xl2 == NULL) {
		gf_log ("xlator", GF_LOG_DEBUG, "invalid argument");
		return -1;
	}

	trav1 = xl1->children;
	trav2 = xl2->children;

	while (trav1 && trav2) {
		ret = xlator_equal_rec (trav1->xlator, trav2->xlator);
		if (ret) {
			gf_log ("glfs-mgmt", GF_LOG_DEBUG,
				"xlators children not equal");
			goto out;
		}

		trav1 = trav1->next;
		trav2 = trav2->next;
	}

	if (trav1 || trav2) {
		ret = -1;
		goto out;
	}

	if (strcmp (xl1->name, xl2->name)) {
		ret = -1;
		goto out;
	}
out :
	return ret;
}


static gf_boolean_t
is_graph_topology_equal (glusterfs_graph_t *graph1,
			 glusterfs_graph_t *graph2)
{
	xlator_t    *trav1    = NULL;
	xlator_t    *trav2    = NULL;
	gf_boolean_t ret      = _gf_true;

	trav1 = graph1->first;
	trav2 = graph2->first;

	ret = xlator_equal_rec (trav1, trav2);

	if (ret) {
		gf_log ("glfs-mgmt", GF_LOG_DEBUG,
			"graphs are not equal");
		ret = _gf_false;
		goto out;
	}

	ret = _gf_true;
	gf_log ("glfs-mgmt", GF_LOG_DEBUG,
		"graphs are equal");

out:
	return ret;
}


/* Function has 3types of return value 0, -ve , 1
 *   return 0	       =======> reconfiguration of options has succeeded
 *   return 1	       =======> the graph has to be reconstructed and all the xlators should be inited
 *   return -1(or -ve) =======> Some Internal Error occurred during the operation
 */
static int
glusterfs_volfile_reconfigure (struct glfs *fs, FILE *newvolfile_fp)
{
	glusterfs_graph_t *oldvolfile_graph = NULL;
	glusterfs_graph_t *newvolfile_graph = NULL;
	FILE		  *oldvolfile_fp    = NULL;
	glusterfs_ctx_t	  *ctx		    = NULL;

	int ret = -1;

	oldvolfile_fp = tmpfile ();
	if (!oldvolfile_fp)
		goto out;

	if (!fs->oldvollen) {
		ret = 1; // Has to call INIT for the whole graph
		goto out;
	}
	fwrite (fs->oldvolfile, fs->oldvollen, 1, oldvolfile_fp);
	fflush (oldvolfile_fp);
	if (ferror (oldvolfile_fp)) {
		goto out;
	}

	oldvolfile_graph = glusterfs_graph_construct (oldvolfile_fp);
	if (!oldvolfile_graph) {
		goto out;
	}

	newvolfile_graph = glusterfs_graph_construct (newvolfile_fp);
	if (!newvolfile_graph) {
		goto out;
	}

	if (!is_graph_topology_equal (oldvolfile_graph,
				      newvolfile_graph)) {

		ret = 1;
		gf_log ("glfs-mgmt", GF_LOG_DEBUG,
			"Graph topology not equal(should call INIT)");
		goto out;
	}

	gf_log ("glfs-mgmt", GF_LOG_DEBUG,
		"Only options have changed in the new "
		"graph");

	ctx = fs->ctx;

	if (!ctx) {
		gf_log ("glfs-mgmt", GF_LOG_ERROR,
			"glusterfs_ctx_get() returned NULL");
		goto out;
	}

	oldvolfile_graph = ctx->active;

	if (!oldvolfile_graph) {
		gf_log ("glfs-mgmt", GF_LOG_ERROR,
			"glusterfs_ctx->active is NULL");
		goto out;
	}

	/* */
	ret = glusterfs_graph_reconfigure (oldvolfile_graph,
					   newvolfile_graph);
	if (ret) {
		gf_log ("glfs-mgmt", GF_LOG_DEBUG,
			"Could not reconfigure new options in old graph");
		goto out;
	}

	ret = 0;
out:
	if (oldvolfile_fp)
		fclose (oldvolfile_fp);

	return ret;
}


static int
glusterfs_oldvolfile_update (struct glfs *fs, char *volfile, ssize_t size)
{
	int ret = -1;

	fs->oldvollen = size;
	if (!fs->oldvolfile) {
		fs->oldvolfile = GF_CALLOC (1, size+1, glfs_mt_volfile_t);
	} else {
		fs->oldvolfile = GF_REALLOC (fs->oldvolfile, size+1);
	}

	if (!fs->oldvolfile) {
		fs->oldvollen = 0;
	} else {
		memcpy (fs->oldvolfile, volfile, size);
		fs->oldvollen = size;
		ret = 0;
	}

	return ret;
}


int
mgmt_getspec_cbk (struct rpc_req *req, struct iovec *iov, int count,
		  void *myframe)
{
	gf_getspec_rsp		 rsp   = {0,};
	call_frame_t		*frame = NULL;
	glusterfs_ctx_t		*ctx = NULL;
	int			 ret   = 0;
	ssize_t			 size = 0;
	FILE			*tmpfp = NULL;
	int                      need_retry = 0;
	struct glfs		*fs = NULL;

	frame = myframe;
	ctx = frame->this->ctx;
	fs = ((xlator_t *)ctx->master)->private;

	if (-1 == req->rpc_status) {
		ret = -1;
		need_retry = 1;
		goto out;
	}

	ret = xdr_to_generic (*iov, &rsp, (xdrproc_t)xdr_gf_getspec_rsp);
	if (ret < 0) {
		gf_log (frame->this->name, GF_LOG_ERROR, "XDR decoding error");
		ret   = -1;
		goto out;
	}

	if (-1 == rsp.op_ret) {
		gf_log (frame->this->name, GF_LOG_ERROR,
			"failed to get the 'volume file' from server");
		ret = -1;
		goto out;
	}

	ret = 0;
	size = rsp.op_ret;

	if ((size == fs->oldvollen) &&
	    (memcmp (fs->oldvolfile, rsp.spec, size) == 0)) {
		gf_log (frame->this->name, GF_LOG_INFO,
			"No change in volfile, continuing");
		goto out;
	}

	tmpfp = tmpfile ();
	if (!tmpfp) {
		ret = -1;
		goto out;
	}

	fwrite (rsp.spec, size, 1, tmpfp);
	fflush (tmpfp);
	if (ferror (tmpfp)) {
		ret = -1;
		goto out;
	}

	/*  Check if only options have changed. No need to reload the
	*  volfile if topology hasn't changed.
	*  glusterfs_volfile_reconfigure returns 3 possible return states
	*  return 0	     =======> reconfiguration of options has succeeded
	*  return 1	     =======> the graph has to be reconstructed and all the xlators should be inited
	*  return -1(or -ve) =======> Some Internal Error occurred during the operation
	*/

	ret = glusterfs_volfile_reconfigure (fs, tmpfp);
	if (ret == 0) {
		gf_log ("glusterfsd-mgmt", GF_LOG_DEBUG,
			"No need to re-load volfile, reconfigure done");
		ret = glusterfs_oldvolfile_update (fs, rsp.spec, size);
		goto out;
	}

	if (ret < 0) {
		gf_log ("glusterfsd-mgmt", GF_LOG_DEBUG,
			"Reconfigure failed !!");
		goto out;
	}

	ret = glfs_process_volfp (fs, tmpfp);
	/* tmpfp closed */
	tmpfp = NULL;
	if (ret)
		goto out;

	ret = glusterfs_oldvolfile_update (fs, rsp.spec, size);
out:
	STACK_DESTROY (frame->root);

	if (rsp.spec)
		free (rsp.spec);

	if (ret && ctx && !ctx->active) {
		/* Do it only for the first time */
		/* Failed to get the volume file, something wrong,
		   restart the process */
		gf_log ("glfs-mgmt", GF_LOG_ERROR,
			"failed to fetch volume file (key:%s)",
			ctx->cmd_args.volfile_id);
		if (!need_retry)
			glfs_init_done (fs, -1);
	}

	if (tmpfp)
		fclose (tmpfp);

	return 0;
}


int
glfs_volfile_fetch (struct glfs *fs)
{
	cmd_args_t	 *cmd_args = NULL;
	gf_getspec_req	  req = {0, };
	int		  ret = 0;
	call_frame_t	 *frame = NULL;
	glusterfs_ctx_t	 *ctx = NULL;

	ctx = fs->ctx;
	cmd_args = &ctx->cmd_args;

	frame = create_frame (THIS, ctx->pool);

	req.key = cmd_args->volfile_id;
	req.flags = 0;

	ret = mgmt_submit_request (&req, frame, ctx, &clnt_handshake_prog,
				   GF_HNDSK_GETSPEC, mgmt_getspec_cbk,
				   (xdrproc_t)xdr_gf_getspec_req);
	return ret;
}


static int
mgmt_rpc_notify (struct rpc_clnt *rpc, void *mydata, rpc_clnt_event_t event,
		 void *data)
{
	xlator_t	*this = NULL;
	cmd_args_t	*cmd_args = NULL;
	glusterfs_ctx_t *ctx = NULL;
	struct glfs	 *fs = NULL;
	int		 ret = 0;

	this = mydata;
	ctx = this->ctx;
	fs = ((xlator_t *)ctx->master)->private;
	cmd_args = &ctx->cmd_args;

	switch (event) {
	case RPC_CLNT_DISCONNECT:
		if (!ctx->active) {
			cmd_args->max_connect_attempts--;
			gf_log ("glfs-mgmt", GF_LOG_ERROR,
				"failed to connect with remote-host: %s",
				strerror (errno));
			gf_log ("glfs-mgmt", GF_LOG_INFO,
				"%d connect attempts left",
				cmd_args->max_connect_attempts);
			if (0 >= cmd_args->max_connect_attempts)
				glfs_init_done (fs, -1);
				break;
		}
		break;
	case RPC_CLNT_CONNECT:
		rpc_clnt_set_connected (&((struct rpc_clnt*)ctx->mgmt)->conn);

		ret = glfs_volfile_fetch (fs);
		if (ret && ctx && (ctx->active == NULL)) {
			/* Do it only for the first time */
			/* Exit the process.. there is some wrong options */
			gf_log ("glfs-mgmt", GF_LOG_ERROR,
				"failed to fetch volume file (key:%s)",
				ctx->cmd_args.volfile_id);
			glfs_init_done (fs, -1);
		}

		break;
	default:
		break;
	}

	return 0;
}


int
glusterfs_mgmt_notify (int32_t op, void *data, ...)
{
	int ret = 0;

	switch (op)
	{
		case GF_EN_DEFRAG_STATUS:
			break;

		default:
			break;
	}

	return ret;
}


int
glfs_mgmt_init (struct glfs *fs)
{
	cmd_args_t		*cmd_args = NULL;
	struct rpc_clnt		*rpc = NULL;
	dict_t			*options = NULL;
	int			ret = -1;
	int			port = GF_DEFAULT_BASE_PORT;
	char			*host = NULL;
	glusterfs_ctx_t		*ctx = NULL;

	ctx = fs->ctx;
	cmd_args = &ctx->cmd_args;

	if (ctx->mgmt)
		return 0;

	if (cmd_args->volfile_server_port)
		port = cmd_args->volfile_server_port;

	host = "localhost";
	if (cmd_args->volfile_server)
		host = cmd_args->volfile_server;

	ret = rpc_transport_inet_options_build (&options, host, port);
	if (ret)
		goto out;

	rpc = rpc_clnt_new (options, THIS->ctx, THIS->name, 8);
	if (!rpc) {
		ret = -1;
		gf_log (THIS->name, GF_LOG_WARNING,
			"failed to create rpc clnt");
		goto out;
	}

	ret = rpc_clnt_register_notify (rpc, mgmt_rpc_notify, THIS);
	if (ret) {
		gf_log (THIS->name, GF_LOG_WARNING,
			"failed to register notify function");
		goto out;
	}

	ret = rpcclnt_cbk_program_register (rpc, &mgmt_cbk_prog, THIS);
	if (ret) {
		gf_log (THIS->name, GF_LOG_WARNING,
			"failed to register callback function");
		goto out;
	}

	ctx->notify = glusterfs_mgmt_notify;

	/* This value should be set before doing the 'rpc_clnt_start()' as
	   the notify function uses this variable */
	ctx->mgmt = rpc;

	ret = rpc_clnt_start (rpc);
out:
	return ret;
}