summaryrefslogtreecommitdiffstats
path: root/xlators/features/bit-rot/src/stub/bit-rot-stub-helpers.c
blob: bf3e56a6c7432454c8f1a0a7940afcd130a127a2 (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
/*
   Copyright (c) 2015 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 "bit-rot-stub.h"

br_stub_fd_t *
br_stub_fd_new (void)
{
        br_stub_fd_t    *br_stub_fd = NULL;

        br_stub_fd = GF_CALLOC (1, sizeof (*br_stub_fd),
                                gf_br_stub_mt_br_stub_fd_t);

        return br_stub_fd;
}

int
__br_stub_fd_ctx_set (xlator_t *this, fd_t *fd, br_stub_fd_t *br_stub_fd)
{
        uint64_t    value = 0;
        int         ret   = -1;

        GF_VALIDATE_OR_GOTO ("bit-rot-stub", this, out);
        GF_VALIDATE_OR_GOTO (this->name, fd, out);
        GF_VALIDATE_OR_GOTO (this->name, br_stub_fd, out);

        value = (uint64_t)(long) br_stub_fd;

        ret = __fd_ctx_set (fd, this, value);

out:
        return ret;
}

br_stub_fd_t *
__br_stub_fd_ctx_get (xlator_t *this, fd_t *fd)
{
        br_stub_fd_t *br_stub_fd = NULL;
        uint64_t  value  = 0;
        int       ret    = -1;

        GF_VALIDATE_OR_GOTO ("bit-rot-stub", this, out);
        GF_VALIDATE_OR_GOTO (this->name, fd, out);

        ret = __fd_ctx_get (fd, this, &value);
        if (ret)
                return NULL;

        br_stub_fd = (br_stub_fd_t *) ((long) value);

out:
        return br_stub_fd;
}

br_stub_fd_t *
br_stub_fd_ctx_get (xlator_t *this, fd_t *fd)
{
        br_stub_fd_t *br_stub_fd = NULL;

        GF_VALIDATE_OR_GOTO ("bit-rot-stub", this, out);
        GF_VALIDATE_OR_GOTO (this->name, fd, out);

        LOCK (&fd->lock);
        {
                br_stub_fd = __br_stub_fd_ctx_get (this, fd);
        }
        UNLOCK (&fd->lock);

out:
        return br_stub_fd;
}

int32_t
br_stub_fd_ctx_set (xlator_t *this, fd_t *fd, br_stub_fd_t *br_stub_fd)
{
        int32_t    ret = -1;

        GF_VALIDATE_OR_GOTO ("bit-rot-stub", this, out);
        GF_VALIDATE_OR_GOTO (this->name, fd, out);
        GF_VALIDATE_OR_GOTO (this->name, br_stub_fd, out);

        LOCK (&fd->lock);
        {
                ret = __br_stub_fd_ctx_set (this, fd, br_stub_fd);
        }
        UNLOCK (&fd->lock);

out:
        return ret;
}


/**
 * prints the path to the bad object's entry into the buffer provided.
 * @priv: xlator private
 * @filename: gfid of the bad object.
 * @file_path: buffer provided into which path of the bad object is printed
 *            using above 2 arguments.
 */
static void
br_stub_link_path (br_stub_private_t *priv, const char *filename,
                        char *file_path, size_t len)
{
        snprintf (file_path, len, "%s/%s", priv->stub_basepath, filename);
}

/**
 * Prints the path of the object which acts as a container for all the bad
 * objects. Each new entry corresponding to a bad object is a hard link to
 * the object with name "stub-0000000000000008".
 * @priv: xlator's private
 * @stub_gfid_path: buffer into which the path to the container of bad objects
 *                  is printed.
 */
static void
br_stub_container_entry (br_stub_private_t *priv, char *stub_gfid_path,
                         size_t len)
{

        snprintf (stub_gfid_path, len, "%s/stub-%s", priv->stub_basepath,
                  uuid_utoa (priv->bad_object_dir_gfid));
}

/**
 * Prints the path to the bad object's entry into the buffer provided.
 * @priv: xlator private
 * @gfid: gfid of the bad object.
 * @gfid_path: buffer provided into which path of the bad object is printed
 *            using above 2 arguments.
 * This function is same as br_stub_link_path. But in this function the
 * gfid of the bad object is obtained as an argument (i.e. uuid_t gfid),
 * where as in br_stub_link_path, the gfid is received as filename
 * (i.e. char *filename)
 */
static void
br_stub_linked_entry (br_stub_private_t *priv, char *gfid_path, uuid_t gfid,
                        size_t len)
{
        snprintf (gfid_path, len, "%s/%s", priv->stub_basepath,
                  uuid_utoa (gfid));
}

/**
 * Adds an entry to the bad objects directory.
 * @gfid: gfid of the bad object being added to the bad objects directory
 */
int
br_stub_add (xlator_t *this, uuid_t gfid)
{
        char              gfid_path[PATH_MAX] = {0};
        char              bad_gfid_path[PATH_MAX] = {0};
        int               ret = 0;
        br_stub_private_t *priv = NULL;
        struct stat       st = {0};

        priv = this->private;
        GF_ASSERT_AND_GOTO_WITH_ERROR (this->name, !gf_uuid_is_null (gfid),
                                       out, errno, EINVAL);

        br_stub_linked_entry (priv, gfid_path, gfid, sizeof (gfid_path));

        ret = sys_stat (gfid_path, &st);
        if (!ret)
                goto out;
        br_stub_container_entry (priv, bad_gfid_path, sizeof (bad_gfid_path));

        ret = sys_link (bad_gfid_path, gfid_path);
        if (ret) {
                if ((errno != ENOENT) && (errno != EMLINK) && (errno != EEXIST))
                        goto out;

                /*
                 * Continue with success. At least we'll have half of the
                 * functionality, in the sense, object is marked bad and
                 * would be inaccessible. It's only scrub status that would
                 * show up less number of objects. That's fine as we'll have
                 * the log files that will have the missing information.
                 */
                gf_msg (this->name, GF_LOG_WARNING, errno, BRS_MSG_LINK_FAIL,
                        "failed to record  gfid [%s]", uuid_utoa (gfid));
        }

        return 0;
out:
        return -1;
}

int
br_stub_del (xlator_t *this, uuid_t gfid)
{
        int32_t      op_errno __attribute__((unused)) = 0;
        br_stub_private_t *priv = NULL;
        int          ret = 0;
        char         gfid_path[PATH_MAX] = {0};

        priv = this->private;
        GF_ASSERT_AND_GOTO_WITH_ERROR (this->name, !gf_uuid_is_null (gfid),
                                       out, op_errno, EINVAL);
        br_stub_linked_entry (priv, gfid_path, gfid,
                              sizeof (gfid_path));
        ret = sys_unlink (gfid_path);
        if (ret && (errno != ENOENT)) {
                gf_msg (this->name, GF_LOG_ERROR, errno,
                        BRS_MSG_BAD_OBJ_UNLINK_FAIL,
                        "%s: failed to delete bad object link from quarantine "
                        "directory", gfid_path);
                ret = -errno;
                goto out;
        }

        ret = 0;

out:
        return ret;
}

static int
br_stub_check_stub_directory (xlator_t *this, char *fullpath)
{
        int ret = 0;
        struct stat st = {0,};

        ret = sys_stat (fullpath, &st);
        if (!ret && !S_ISDIR (st.st_mode))
                goto error_return;
        if (ret) {
                if (errno != ENOENT)
                        goto error_return;
                ret = mkdir_p (fullpath, 0600, _gf_true);
        }

        if (ret)
                gf_msg (this->name, GF_LOG_ERROR, errno,
                        BRS_MSG_BAD_OBJECT_DIR_FAIL,
                        "failed to create stub directory [%s]", fullpath);
        return ret;

error_return:
        gf_msg (this->name, GF_LOG_ERROR, errno,
                BRS_MSG_BAD_OBJECT_DIR_FAIL,
                "Failed to verify stub directory [%s]", fullpath);
        return -1;
}

/**
 * Function to create the container for the bad objects within the bad objects
 * directory.
 */
static int
br_stub_check_stub_file (xlator_t *this, char *path)
{
        int ret = 0;
        int fd = -1;
        struct stat st = {0,};

        ret = sys_stat (path, &st);
        if (!ret && !S_ISREG (st.st_mode))
                goto error_return;
        if (ret) {
                if (errno != ENOENT)
                        goto error_return;
                fd = sys_creat (path, 0);
                if (fd < 0)
                        gf_msg (this->name, GF_LOG_ERROR, errno,
                                BRS_MSG_BAD_OBJECT_DIR_FAIL,
                                "Failed ot create stub file [%s]", path);
        }

        if (fd >= 0) {
                sys_close (fd);
                ret = 0;
        }

        return ret;

error_return:
        gf_msg (this->name, GF_LOG_ERROR, errno,
                BRS_MSG_BAD_OBJECT_DIR_FAIL, "Failed ot verify stub file [%s]", path);
        return -1;
}

int
br_stub_dir_create (xlator_t *this, br_stub_private_t *priv)
{
        int          ret = -1;
        char         fullpath[PATH_MAX] = {0};
        char         stub_gfid_path[PATH_MAX] = {0, };

        gf_uuid_copy (priv->bad_object_dir_gfid, BR_BAD_OBJ_CONTAINER);

        snprintf (fullpath, sizeof (fullpath), "%s", priv->stub_basepath);

        br_stub_container_entry (priv, stub_gfid_path, sizeof (stub_gfid_path));

        ret = br_stub_check_stub_directory (this, fullpath);
        if (ret)
                goto out;
        ret = br_stub_check_stub_file (this, stub_gfid_path);
        if (ret)
                goto out;

        return 0;

out:
        return -1;
}

call_stub_t *
__br_stub_dequeue (struct list_head *callstubs)
{
        call_stub_t *stub = NULL;

        if (!list_empty (callstubs)) {
                stub = list_entry (callstubs->next, call_stub_t, list);
                list_del_init (&stub->list);
        }

        return stub;
}

void
__br_stub_enqueue (struct list_head *callstubs, call_stub_t *stub)
{
        list_add_tail (&stub->list, callstubs);
}

void
br_stub_worker_enqueue (xlator_t *this, call_stub_t *stub)
{
        br_stub_private_t    *priv = NULL;

        priv = this->private;
        pthread_mutex_lock (&priv->container.bad_lock);
        {
                __br_stub_enqueue (&priv->container.bad_queue, stub);
                pthread_cond_signal (&priv->container.bad_cond);
        }
        pthread_mutex_unlock (&priv->container.bad_lock);
}

void *
br_stub_worker (void *data)
{
        br_stub_private_t     *priv = NULL;
        xlator_t         *this = NULL;
        call_stub_t      *stub = NULL;


        THIS = data;
        this = data;
        priv = this->private;

        for (;;) {
                pthread_mutex_lock (&priv->container.bad_lock);
                {
                        while (list_empty (&priv->container.bad_queue)) {
                              (void) pthread_cond_wait (&priv->container.bad_cond,
                                                        &priv->container.bad_lock);
                        }

                        stub = __br_stub_dequeue (&priv->container.bad_queue);
                }
                pthread_mutex_unlock (&priv->container.bad_lock);

                if (stub) /* guard against spurious wakeups */
                        call_resume (stub);
        }

        return NULL;
}

int32_t
br_stub_lookup_wrapper (call_frame_t *frame, xlator_t *this,
                      loc_t *loc, dict_t *xattr_req)
{
        br_stub_private_t *priv        = NULL;
        struct stat        lstatbuf    = {0};
        int                ret         = 0;
        int32_t            op_errno    = EINVAL;
        int32_t            op_ret      = -1;
        struct iatt        stbuf       = {0, };
        struct iatt        postparent  = {0,};
        dict_t            *xattr       = NULL;

        priv = this->private;

        VALIDATE_OR_GOTO (loc, done);
        if (gf_uuid_compare (loc->gfid, priv->bad_object_dir_gfid))
                goto done;

        ret = sys_lstat (priv->stub_basepath, &lstatbuf);
        if (ret) {
                gf_msg_debug (this->name, errno, "Stat failed on stub bad "
                              "object dir");
                op_errno = errno;
                goto done;
        } else if (!S_ISDIR (lstatbuf.st_mode)) {
                gf_msg_debug (this->name, errno, "bad object container is not "
                              "a directory");
                op_errno = ENOTDIR;
                goto done;
        }

        iatt_from_stat (&stbuf, &lstatbuf);
        gf_uuid_copy (stbuf.ia_gfid, priv->bad_object_dir_gfid);

        op_ret = op_errno = 0;
        xattr = dict_new ();
        if (!xattr) {
                op_ret = -1;
                op_errno = ENOMEM;
        }

done:
        STACK_UNWIND_STRICT (lookup, frame, op_ret, op_errno,
                             loc->inode, &stbuf, xattr, &postparent);
        if (xattr)
                dict_unref (xattr);
        return 0;
}

static int
is_bad_gfid_file_current (char *filename, uuid_t gfid)
{
        char current_stub_gfid[GF_UUID_BUF_SIZE + 16] = {0, };

        snprintf (current_stub_gfid, sizeof current_stub_gfid,
                  "stub-%s", uuid_utoa(gfid));
        return (!strcmp(filename, current_stub_gfid));
}

static void
check_delete_stale_bad_file (xlator_t *this, char *filename)
{
        int             ret = 0;
        struct stat     st = {0};
        char            filepath[PATH_MAX] = {0};
        br_stub_private_t    *priv = NULL;

        priv = this->private;

        if (is_bad_gfid_file_current (filename, priv->bad_object_dir_gfid))
                return;

        br_stub_link_path (priv, filename, filepath, sizeof (filepath));

        ret = sys_stat (filepath, &st);
        if (!ret && st.st_nlink == 1)
                sys_unlink (filepath);
}

static int
br_stub_fill_readdir (fd_t *fd, br_stub_fd_t *fctx, DIR *dir, off_t off,
                      size_t size, gf_dirent_t *entries)
{
        off_t          in_case = -1;
        off_t          last_off = 0;
        size_t         filled = 0;
        int            count = 0;
        int32_t        this_size      = -1;
        gf_dirent_t   *this_entry     = NULL;
        xlator_t      *this           = NULL;
        struct dirent *entry          = NULL;
        struct dirent  scratch[2]     = {{0,},};

        this = THIS;
        if (!off) {
                rewinddir (dir);
        } else {
                seekdir (dir, off);
#ifndef GF_LINUX_HOST_OS
                if ((u_long)telldir(dir) != off &&
                    off != fctx->bad_object.dir_eof) {
                        gf_msg (THIS->name, GF_LOG_ERROR, 0,
                                BRS_MSG_BAD_OBJECT_DIR_SEEK_FAIL,
                                "seekdir(0x%llx) failed on dir=%p: "
				"Invalid argument (offset reused from "
				"another DIR * structure?)", off, dir);
                        errno = EINVAL;
                        count = -1;
                        goto out;
                }
#endif /* GF_LINUX_HOST_OS */
        }

        while (filled <= size) {
                in_case = (u_long)telldir (dir);

                if (in_case == -1) {
                        gf_msg (THIS->name, GF_LOG_ERROR, 0,
                                BRS_MSG_BAD_OBJECT_DIR_TELL_FAIL,
                                "telldir failed on dir=%p: %s",
                                dir, strerror (errno));
                        goto out;
                }

                errno = 0;
                entry = sys_readdir (dir, scratch);
                if (!entry || errno != 0) {
                        if (errno == EBADF) {
                                gf_msg (THIS->name, GF_LOG_WARNING, 0,
                                        BRS_MSG_BAD_OBJECT_DIR_READ_FAIL,
                                        "readdir failed on dir=%p: %s",
                                        dir, strerror (errno));
                                goto out;
                        }
                        break;
                }

                if (!strcmp (entry->d_name, ".") ||
                    !strcmp (entry->d_name, ".."))
                        continue;

                if (!strncmp (entry->d_name, "stub-",
                              strlen ("stub-"))) {
                        check_delete_stale_bad_file (this, entry->d_name);
                        continue;
                }

                this_size = max (sizeof (gf_dirent_t),
                                 sizeof (gfs3_dirplist))
                        + strlen (entry->d_name) + 1;

                if (this_size + filled > size) {
                        seekdir (dir, in_case);
#ifndef GF_LINUX_HOST_OS
                        if ((u_long)telldir(dir) != in_case &&
                            in_case != fctx->bad_object.dir_eof) {
				gf_msg (THIS->name, GF_LOG_ERROR, 0,
                                        BRS_MSG_BAD_OBJECT_DIR_SEEK_FAIL,
					"seekdir(0x%llx) failed on dir=%p: "
					"Invalid argument (offset reused from "
					"another DIR * structure?)",
					in_case, dir);
				errno = EINVAL;
				count = -1;
				goto out;
                        }
#endif /* GF_LINUX_HOST_OS */
                        break;
                }

                this_entry = gf_dirent_for_name (entry->d_name);

                if (!this_entry) {
                        gf_msg (THIS->name, GF_LOG_ERROR, 0,
                                BRS_MSG_NO_MEMORY,
                                "could not create gf_dirent for entry %s: (%s)",
                                entry->d_name, strerror (errno));
                        goto out;
                }
                /*
                 * we store the offset of next entry here, which is
                 * probably not intended, but code using syncop_readdir()
                 * (glfs-heal.c, afr-self-heald.c, pump.c) rely on it
                 * for directory read resumption.
                 */
                last_off = (u_long)telldir(dir);
                this_entry->d_off = last_off;
                this_entry->d_ino = entry->d_ino;

                list_add_tail (&this_entry->list, &entries->list);

                filled += this_size;
                count++;
        }

        if ((!sys_readdir (dir, scratch) && (errno == 0))) {
                /* Indicate EOF */
                errno = ENOENT;
                /* Remember EOF offset for later detection */
                fctx->bad_object.dir_eof = last_off;
        }
out:
        return count;
}

int32_t
br_stub_readdir_wrapper (call_frame_t *frame, xlator_t *this,
                         fd_t *fd, size_t size, off_t off, dict_t *xdata)
{
        br_stub_fd_t         *fctx           = NULL;
        DIR                  *dir            = NULL;
        int                   ret            = -1;
        int32_t               op_ret         = -1;
        int32_t               op_errno       = 0;
        int                   count          = 0;
        gf_dirent_t           entries;

        INIT_LIST_HEAD (&entries.list);

        fctx = br_stub_fd_ctx_get (this, fd);
        if (!fctx) {
                gf_msg (this->name, GF_LOG_WARNING, 0,
                        BRS_MSG_GET_FD_CONTEXT_FAILED,
                        "pfd is NULL, fd=%p", fd);
                op_errno = -ret;
                goto done;
        }

        dir = fctx->bad_object.dir;

        if (!dir) {
                gf_msg (this->name, GF_LOG_WARNING, 0,
                        BRS_MSG_BAD_HANDLE_DIR_NULL,
                        "dir is NULL for fd=%p", fd);
                op_errno = EINVAL;
                goto done;
        }

        count = br_stub_fill_readdir (fd, fctx, dir, off, size, &entries);

        /* pick ENOENT to indicate EOF */
        op_errno = errno;
        op_ret = count;
done:
        STACK_UNWIND_STRICT (readdir, frame, op_ret, op_errno, &entries, xdata);
        gf_dirent_free (&entries);
        return 0;
}