summaryrefslogtreecommitdiffstats
path: root/xlators/features/locks/src/clear.c
blob: 1609fc416d2f362351d1b8bfdf0396f7c5eddca5 (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
/*
   Copyright (c) 2006-2012 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 <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include <pthread.h>

#include "glusterfs.h"
#include "compat.h"
#include "xlator.h"
#include "logging.h"
#include "common-utils.h"

#include "locks.h"
#include "common.h"
#include "statedump.h"
#include "clear.h"

int
clrlk_get_kind (char *kind)
{
        char  *clrlk_kinds[CLRLK_KIND_MAX] = {"dummy", "blocked", "granted",
                                              "all"};
        int   ret_kind                     = CLRLK_KIND_MAX;
        int   i                            = 0;

        for (i = CLRLK_BLOCKED; i < CLRLK_KIND_MAX; i++) {
                if (!strcmp (clrlk_kinds[i], kind)) {
                        ret_kind = i;
                        break;
                }
        }

        return ret_kind;
}

int
clrlk_get_type (char *type)
{
        char    *clrlk_types[CLRLK_TYPE_MAX]    = {"inode", "entry", "posix"};
        int     ret_type                        = CLRLK_TYPE_MAX;
        int     i                               = 0;

        for (i = CLRLK_INODE; i < CLRLK_TYPE_MAX; i++) {
                if (!strcmp (clrlk_types[i], type)) {
                        ret_type = i;
                        break;
                }
        }

        return ret_type;
}

int
clrlk_get_lock_range (char *range_str, struct gf_flock *ulock,
                      gf_boolean_t *chk_range)
{
        int     ret     =       -1;

        if (!chk_range)
                goto out;

        if (!range_str) {
                ret = 0;
                *chk_range = _gf_false;
                goto out;
        }

        if (sscanf (range_str, "%hd,%"PRId64"-""%"PRId64, &ulock->l_whence,
                    &ulock->l_start, &ulock->l_len) != 3) {
                goto out;
        }

        ret = 0;
        *chk_range = _gf_true;
out:
        return ret;
}

int
clrlk_parse_args (const char* cmd, clrlk_args *args)
{
        char            *opts           = NULL;
        char            *cur            = NULL;
        char            *tok            = NULL;
        char            *sptr           = NULL;
        char            *free_ptr       = NULL;
        char            kw[KW_MAX]     = {[KW_TYPE]     = 't',
                                          [KW_KIND]     = 'k',
                                          };
        int             ret             = -1;
        int             i               = 0;

        GF_ASSERT (cmd);
        free_ptr = opts = GF_CALLOC (1, strlen (cmd), gf_common_mt_char);
        if (!opts)
                goto out;

        if (sscanf (cmd, GF_XATTR_CLRLK_CMD".%s", opts) < 1) {
                ret = -1;
                goto out;
        }

        /*clr_lk_prefix.ttype.kkind.args, args - type specific*/
        cur = opts;
        for (i = 0; i < KW_MAX && (tok = strtok_r (cur, ".", &sptr));
             cur = NULL, i++) {
                if (tok[0] != kw[i]) {
                        ret = -1;
                        goto out;
                }
                if (i == KW_TYPE)
                        args->type = clrlk_get_type (tok+1);
                if (i == KW_KIND)
                        args->kind = clrlk_get_kind (tok+1);
        }

        if ((args->type == CLRLK_TYPE_MAX) || (args->kind == CLRLK_KIND_MAX))
                goto out;

        /*optional args, neither range nor basename can 'legally' contain
         * "/" in them*/
        tok = strtok_r (NULL, "/", &sptr);
        if (tok)
                args->opts = gf_strdup (tok);

        ret = 0;
out:
        GF_FREE (free_ptr);
        return ret;
}

int
clrlk_clear_posixlk (xlator_t *this, pl_inode_t *pl_inode, clrlk_args *args,
                     int *blkd, int *granted, int *op_errno)
{
        posix_lock_t            *plock          = NULL;
        posix_lock_t            *tmp            = NULL;
        struct gf_flock         ulock           = {0, };
        int                     ret             = -1;
        int                     bcount          = 0;
        int                     gcount          = 0;
        gf_boolean_t            chk_range       = _gf_false;

        if (clrlk_get_lock_range (args->opts, &ulock, &chk_range)) {
                *op_errno = EINVAL;
                goto out;
        }

        pthread_mutex_lock (&pl_inode->mutex);
        {
                list_for_each_entry_safe (plock, tmp, &pl_inode->ext_list,
                                          list) {
                        if ((plock->blocked &&
                             !(args->kind & CLRLK_BLOCKED)) ||
                            (!plock->blocked &&
                             !(args->kind & CLRLK_GRANTED)))
                                continue;

                        if (chk_range &&
                            (plock->user_flock.l_whence != ulock.l_whence
                            || plock->user_flock.l_start != ulock.l_start
                            || plock->user_flock.l_len != ulock.l_len))
                                continue;

                        list_del_init (&plock->list);
                        if (plock->blocked) {
                                bcount++;
                                pl_trace_out (this, plock->frame, NULL, NULL,
                                              F_SETLKW, &plock->user_flock,
                                              -1, EAGAIN, NULL);

                                STACK_UNWIND_STRICT (lk, plock->frame, -1, EAGAIN,
                                                     &plock->user_flock, NULL);

                        } else {
                                gcount++;
                        }
                        __destroy_lock(plock);
                }
        }
        pthread_mutex_unlock (&pl_inode->mutex);
        grant_blocked_locks (this, pl_inode);
        ret = 0;
out:
        *blkd    = bcount;
        *granted = gcount;
        return ret;
}

/* Returns 0 on success and -1 on failure */
int
clrlk_clear_inodelk (xlator_t *this, pl_inode_t *pl_inode, pl_dom_list_t *dom,
                     clrlk_args *args, int *blkd, int *granted, int *op_errno)
{
        posix_locks_private_t   *priv;
        pl_inode_lock_t         *ilock          = NULL;
        pl_inode_lock_t         *tmp            = NULL;
        struct gf_flock         ulock           = {0, };
        int                     ret             = -1;
        int                     bcount          = 0;
        int                     gcount          = 0;
        gf_boolean_t            chk_range       = _gf_false;
        struct list_head        *pcontend       = NULL;
        struct list_head        released;
        struct list_head        contend;
        struct timespec         now = { };

        INIT_LIST_HEAD (&released);

        priv = this->private;
        if (priv->notify_contention) {
                pcontend = &contend;
                INIT_LIST_HEAD (pcontend);
                timespec_now(&now);
        }

        if (clrlk_get_lock_range (args->opts, &ulock, &chk_range)) {
                *op_errno = EINVAL;
                goto out;
        }

        if (args->kind & CLRLK_BLOCKED)
                goto blkd;

        if (args->kind & CLRLK_GRANTED)
                goto granted;

blkd:
        pthread_mutex_lock (&pl_inode->mutex);
        {
                list_for_each_entry_safe (ilock, tmp, &dom->blocked_inodelks,
                                          blocked_locks) {
                        if (chk_range &&
                            (ilock->user_flock.l_whence != ulock.l_whence
                            || ilock->user_flock.l_start != ulock.l_start
                            || ilock->user_flock.l_len != ulock.l_len))
                                continue;

                        bcount++;
                        list_del_init (&ilock->client_list);
                        list_del_init (&ilock->blocked_locks);
                        list_add (&ilock->blocked_locks, &released);
                }
        }
        pthread_mutex_unlock (&pl_inode->mutex);

        list_for_each_entry_safe (ilock, tmp, &released, blocked_locks) {
                list_del_init (&ilock->blocked_locks);
                pl_trace_out (this, ilock->frame, NULL, NULL, F_SETLKW,
                              &ilock->user_flock, -1, EAGAIN,
                              ilock->volume);
                STACK_UNWIND_STRICT (inodelk, ilock->frame, -1,
                                     EAGAIN, NULL);
                //No need to take lock as the locks are only in one list
                __pl_inodelk_unref (ilock);
        }

        if (!(args->kind & CLRLK_GRANTED)) {
                ret = 0;
                goto out;
        }

granted:
        pthread_mutex_lock (&pl_inode->mutex);
        {
                list_for_each_entry_safe (ilock, tmp, &dom->inodelk_list,
                                          list) {
                        if (chk_range &&
                            (ilock->user_flock.l_whence != ulock.l_whence
                            || ilock->user_flock.l_start != ulock.l_start
                            || ilock->user_flock.l_len != ulock.l_len))
                                continue;

                        gcount++;
                        list_del_init (&ilock->client_list);
                        list_del_init (&ilock->list);
                        list_add (&ilock->list, &released);
                }
        }
        pthread_mutex_unlock (&pl_inode->mutex);

        list_for_each_entry_safe (ilock, tmp, &released, list) {
                list_del_init (&ilock->list);
                //No need to take lock as the locks are only in one list
                __pl_inodelk_unref (ilock);
        }

        ret = 0;
out:
        grant_blocked_inode_locks (this, pl_inode, dom, &now, pcontend);
        if (pcontend != NULL) {
                inodelk_contention_notify(this, pcontend);
        }
        *blkd    = bcount;
        *granted = gcount;
        return ret;
}

/* Returns 0 on success and -1 on failure */
int
clrlk_clear_entrylk (xlator_t *this, pl_inode_t *pl_inode, pl_dom_list_t *dom,
                     clrlk_args *args, int *blkd, int *granted, int *op_errno)
{
        posix_locks_private_t   *priv;
        pl_entry_lock_t         *elock          = NULL;
        pl_entry_lock_t         *tmp            = NULL;
        int                     bcount          = 0;
        int                     gcount          = 0;
        int                     ret             = -1;
        struct list_head        *pcontend       = NULL;
        struct list_head        removed;
        struct list_head        released;
        struct list_head        contend;
        struct timespec         now;

        INIT_LIST_HEAD (&released);

        priv = this->private;
        if (priv->notify_contention) {
                pcontend = &contend;
                INIT_LIST_HEAD (pcontend);
                timespec_now(&now);
        }

        if (args->kind & CLRLK_BLOCKED)
                goto blkd;

        if (args->kind & CLRLK_GRANTED)
                goto granted;

blkd:
        pthread_mutex_lock (&pl_inode->mutex);
        {
                list_for_each_entry_safe (elock, tmp, &dom->blocked_entrylks,
                                          blocked_locks) {
                        if (args->opts) {
                                if (!elock->basename ||
                                    strcmp (elock->basename, args->opts))
                                        continue;
                        }

                        bcount++;

                        list_del_init (&elock->client_list);
                        list_del_init (&elock->blocked_locks);
                        list_add_tail (&elock->blocked_locks, &released);
                }
        }
        pthread_mutex_unlock (&pl_inode->mutex);

        list_for_each_entry_safe (elock, tmp, &released, blocked_locks) {
                list_del_init (&elock->blocked_locks);
                entrylk_trace_out (this, elock->frame, elock->volume, NULL, NULL,
                                   elock->basename, ENTRYLK_LOCK, elock->type,
                                   -1, EAGAIN);
                STACK_UNWIND_STRICT (entrylk, elock->frame, -1, EAGAIN, NULL);

		__pl_entrylk_unref (elock);
        }

        if (!(args->kind & CLRLK_GRANTED)) {
                ret = 0;
                goto out;
        }

granted:
        INIT_LIST_HEAD (&removed);
        pthread_mutex_lock (&pl_inode->mutex);
        {
                list_for_each_entry_safe (elock, tmp, &dom->entrylk_list,
                                          domain_list) {
                        if (args->opts) {
                                if (!elock->basename ||
                                    strcmp (elock->basename, args->opts))
                                        continue;
                        }

                        gcount++;
                        list_del_init (&elock->client_list);
                        list_del_init (&elock->domain_list);
                        list_add_tail (&elock->domain_list, &removed);

                        __pl_entrylk_unref (elock);
                }
        }
        pthread_mutex_unlock (&pl_inode->mutex);

        grant_blocked_entry_locks (this, pl_inode, dom, &now, pcontend);
        if (pcontend != NULL) {
                entrylk_contention_notify(this, pcontend);
        }

        ret = 0;
out:
        *blkd    = bcount;
        *granted = gcount;
        return ret;
}

int
clrlk_clear_lks_in_all_domains (xlator_t *this, pl_inode_t *pl_inode,
                                clrlk_args *args, int *blkd, int *granted,
                                int *op_errno)
{
        pl_dom_list_t   *dom            = NULL;
        int             ret             = -1;
        int             tmp_bcount      = 0;
        int             tmp_gcount      = 0;

        if (list_empty (&pl_inode->dom_list)) {
                ret = 0;
                goto out;
        }

        list_for_each_entry (dom, &pl_inode->dom_list, inode_list) {
                tmp_bcount = tmp_gcount = 0;

                switch (args->type)
                {
                case CLRLK_INODE:
                        ret = clrlk_clear_inodelk (this, pl_inode, dom, args,
                                             &tmp_bcount, &tmp_gcount,
                                             op_errno);
                        if (ret)
                                goto out;
                        break;
                case CLRLK_ENTRY:
                        ret = clrlk_clear_entrylk (this, pl_inode, dom, args,
                                             &tmp_bcount, &tmp_gcount,
                                             op_errno);
                        if (ret)
                                goto out;
                        break;
                }

                *blkd    += tmp_bcount;
                *granted += tmp_gcount;
        }

        ret = 0;
out:
        return ret;
}