aboutsummaryrefslogtreecommitdiff
path: root/fs/ocfs2/filecheck.c
blob: 2cabbcf2f28ee5db19fb4c674c8d55818f7217f4 (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
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * filecheck.c
 *
 * Code which implements online file check.
 *
 * Copyright (C) 2016 SuSE.  All rights reserved.
 *
 * This program 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, version 2.
 *
 * This program 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.
 */

#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/kmod.h>
#include <linux/fs.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/sysctl.h>
#include <cluster/masklog.h>

#include "ocfs2.h"
#include "ocfs2_fs.h"
#include "stackglue.h"
#include "inode.h"

#include "filecheck.h"


/* File check error strings,
 * must correspond with error number in header file.
 */
static const char * const ocfs2_filecheck_errs[] = {
	"SUCCESS",
	"FAILED",
	"INPROGRESS",
	"READONLY",
	"INJBD",
	"INVALIDINO",
	"BLOCKECC",
	"BLOCKNO",
	"VALIDFLAG",
	"GENERATION",
	"UNSUPPORTED"
};

static DEFINE_SPINLOCK(ocfs2_filecheck_sysfs_lock);
static LIST_HEAD(ocfs2_filecheck_sysfs_list);

struct ocfs2_filecheck {
	struct list_head fc_head;	/* File check entry list head */
	spinlock_t fc_lock;
	unsigned int fc_max;	/* Maximum number of entry in list */
	unsigned int fc_size;	/* Current entry count in list */
	unsigned int fc_done;	/* Finished entry count in list */
};

struct ocfs2_filecheck_sysfs_entry {	/* sysfs entry per mounting */
	struct list_head fs_list;
	atomic_t fs_count;
	struct super_block *fs_sb;
	struct kset *fs_devicekset;
	struct kset *fs_fcheckkset;
	struct ocfs2_filecheck *fs_fcheck;
};

#define OCFS2_FILECHECK_MAXSIZE		100
#define OCFS2_FILECHECK_MINSIZE		10

/* File check operation type */
enum {
	OCFS2_FILECHECK_TYPE_CHK = 0,	/* Check a file(inode) */
	OCFS2_FILECHECK_TYPE_FIX,	/* Fix a file(inode) */
	OCFS2_FILECHECK_TYPE_SET = 100	/* Set entry list maximum size */
};

struct ocfs2_filecheck_entry {
	struct list_head fe_list;
	unsigned long fe_ino;
	unsigned int fe_type;
	unsigned int fe_done:1;
	unsigned int fe_status:31;
};

struct ocfs2_filecheck_args {
	unsigned int fa_type;
	union {
		unsigned long fa_ino;
		unsigned int fa_len;
	};
};

static const char *
ocfs2_filecheck_error(int errno)
{
	if (!errno)
		return ocfs2_filecheck_errs[errno];

	BUG_ON(errno < OCFS2_FILECHECK_ERR_START ||
	       errno > OCFS2_FILECHECK_ERR_END);
	return ocfs2_filecheck_errs[errno - OCFS2_FILECHECK_ERR_START + 1];
}

static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
				    struct kobj_attribute *attr,
				    char *buf);
static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
				     struct kobj_attribute *attr,
				     const char *buf, size_t count);
static struct kobj_attribute ocfs2_attr_filecheck_chk =
					__ATTR(check, S_IRUSR | S_IWUSR,
					ocfs2_filecheck_show,
					ocfs2_filecheck_store);
static struct kobj_attribute ocfs2_attr_filecheck_fix =
					__ATTR(fix, S_IRUSR | S_IWUSR,
					ocfs2_filecheck_show,
					ocfs2_filecheck_store);
static struct kobj_attribute ocfs2_attr_filecheck_set =
					__ATTR(set, S_IRUSR | S_IWUSR,
					ocfs2_filecheck_show,
					ocfs2_filecheck_store);

static int ocfs2_filecheck_sysfs_wait(atomic_t *p)
{
	schedule();
	return 0;
}

static void
ocfs2_filecheck_sysfs_free(struct ocfs2_filecheck_sysfs_entry *entry)
{
	struct ocfs2_filecheck_entry *p;

	if (!atomic_dec_and_test(&entry->fs_count))
		wait_on_atomic_t(&entry->fs_count, ocfs2_filecheck_sysfs_wait,
				 TASK_UNINTERRUPTIBLE);

	spin_lock(&entry->fs_fcheck->fc_lock);
	while (!list_empty(&entry->fs_fcheck->fc_head)) {
		p = list_first_entry(&entry->fs_fcheck->fc_head,
				     struct ocfs2_filecheck_entry, fe_list);
		list_del(&p->fe_list);
		BUG_ON(!p->fe_done); /* To free a undone file check entry */
		kfree(p);
	}
	spin_unlock(&entry->fs_fcheck->fc_lock);

	kset_unregister(entry->fs_fcheckkset);
	kset_unregister(entry->fs_devicekset);
	kfree(entry->fs_fcheck);
	kfree(entry);
}

static void
ocfs2_filecheck_sysfs_add(struct ocfs2_filecheck_sysfs_entry *entry)
{
	spin_lock(&ocfs2_filecheck_sysfs_lock);
	list_add_tail(&entry->fs_list, &ocfs2_filecheck_sysfs_list);
	spin_unlock(&ocfs2_filecheck_sysfs_lock);
}

static int ocfs2_filecheck_sysfs_del(const char *devname)
{
	struct ocfs2_filecheck_sysfs_entry *p;

	spin_lock(&ocfs2_filecheck_sysfs_lock);
	list_for_each_entry(p, &ocfs2_filecheck_sysfs_list, fs_list) {
		if (!strcmp(p->fs_sb->s_id, devname)) {
			list_del(&p->fs_list);
			spin_unlock(&ocfs2_filecheck_sysfs_lock);
			ocfs2_filecheck_sysfs_free(p);
			return 0;
		}
	}
	spin_unlock(&ocfs2_filecheck_sysfs_lock);
	return 1;
}

static void
ocfs2_filecheck_sysfs_put(struct ocfs2_filecheck_sysfs_entry *entry)
{
	if (atomic_dec_and_test(&entry->fs_count))
		wake_up_atomic_t(&entry->fs_count);
}

static struct ocfs2_filecheck_sysfs_entry *
ocfs2_filecheck_sysfs_get(const char *devname)
{
	struct ocfs2_filecheck_sysfs_entry *p = NULL;

	spin_lock(&ocfs2_filecheck_sysfs_lock);
	list_for_each_entry(p, &ocfs2_filecheck_sysfs_list, fs_list) {
		if (!strcmp(p->fs_sb->s_id, devname)) {
			atomic_inc(&p->fs_count);
			spin_unlock(&ocfs2_filecheck_sysfs_lock);
			return p;
		}
	}
	spin_unlock(&ocfs2_filecheck_sysfs_lock);
	return NULL;
}

int ocfs2_filecheck_create_sysfs(struct super_block *sb)
{
	int ret = 0;
	struct kset *device_kset = NULL;
	struct kset *fcheck_kset = NULL;
	struct ocfs2_filecheck *fcheck = NULL;
	struct ocfs2_filecheck_sysfs_entry *entry = NULL;
	struct attribute **attrs = NULL;
	struct attribute_group attrgp;

	if (!ocfs2_kset)
		return -ENOMEM;

	attrs = kmalloc(sizeof(struct attribute *) * 4, GFP_NOFS);
	if (!attrs) {
		ret = -ENOMEM;
		goto error;
	} else {
		attrs[0] = &ocfs2_attr_filecheck_chk.attr;
		attrs[1] = &ocfs2_attr_filecheck_fix.attr;
		attrs[2] = &ocfs2_attr_filecheck_set.attr;
		attrs[3] = NULL;
		memset(&attrgp, 0, sizeof(attrgp));
		attrgp.attrs = attrs;
	}

	fcheck = kmalloc(sizeof(struct ocfs2_filecheck), GFP_NOFS);
	if (!fcheck) {
		ret = -ENOMEM;
		goto error;
	} else {
		INIT_LIST_HEAD(&fcheck->fc_head);
		spin_lock_init(&fcheck->fc_lock);
		fcheck->fc_max = OCFS2_FILECHECK_MINSIZE;
		fcheck->fc_size = 0;
		fcheck->fc_done = 0;
	}

	if (strlen(sb->s_id) <= 0) {
		mlog(ML_ERROR,
		"Cannot get device basename when create filecheck sysfs\n");
		ret = -ENODEV;
		goto error;
	}

	device_kset = kset_create_and_add(sb->s_id, NULL, &ocfs2_kset->kobj);
	if (!device_kset) {
		ret = -ENOMEM;
		goto error;
	}

	fcheck_kset = kset_create_and_add("filecheck", NULL,
					  &device_kset->kobj);
	if (!fcheck_kset) {
		ret = -ENOMEM;
		goto error;
	}

	ret = sysfs_create_group(&fcheck_kset->kobj, &attrgp);
	if (ret)
		goto error;

	entry = kmalloc(sizeof(struct ocfs2_filecheck_sysfs_entry), GFP_NOFS);
	if (!entry) {
		ret = -ENOMEM;
		goto error;
	} else {
		atomic_set(&entry->fs_count, 1);
		entry->fs_sb = sb;
		entry->fs_devicekset = device_kset;
		entry->fs_fcheckkset = fcheck_kset;
		entry->fs_fcheck = fcheck;
		ocfs2_filecheck_sysfs_add(entry);
	}

	kfree(attrs);
	return 0;

error:
	kfree(attrs);
	kfree(entry);
	kfree(fcheck);
	kset_unregister(fcheck_kset);
	kset_unregister(device_kset);
	return ret;
}

int ocfs2_filecheck_remove_sysfs(struct super_block *sb)
{
	return ocfs2_filecheck_sysfs_del(sb->s_id);
}

static int
ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
			      unsigned int count);
static int
ocfs2_filecheck_adjust_max(struct ocfs2_filecheck_sysfs_entry *ent,
			   unsigned int len)
{
	int ret;

	if ((len < OCFS2_FILECHECK_MINSIZE) || (len > OCFS2_FILECHECK_MAXSIZE))
		return -EINVAL;

	spin_lock(&ent->fs_fcheck->fc_lock);
	if (len < (ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done)) {
		mlog(ML_ERROR,
		"Cannot set online file check maximum entry number "
		"to %u due to too many pending entries(%u)\n",
		len, ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done);
		ret = -EBUSY;
	} else {
		if (len < ent->fs_fcheck->fc_size)
			BUG_ON(!ocfs2_filecheck_erase_entries(ent,
				ent->fs_fcheck->fc_size - len));

		ent->fs_fcheck->fc_max = len;
		ret = 0;
	}
	spin_unlock(&ent->fs_fcheck->fc_lock);

	return ret;
}

#define OCFS2_FILECHECK_ARGS_LEN	24
static int
ocfs2_filecheck_args_get_long(const char *buf, size_t count,
			      unsigned long *val)
{
	char buffer[OCFS2_FILECHECK_ARGS_LEN];

	memcpy(buffer, buf, count);
	buffer[count] = '\0';

	if (kstrtoul(buffer, 0, val))
		return 1;

	return 0;
}

static int
ocfs2_filecheck_type_parse(const char *name, unsigned int *type)
{
	if (!strncmp(name, "fix", 4))
		*type = OCFS2_FILECHECK_TYPE_FIX;
	else if (!strncmp(name, "check", 6))
		*type = OCFS2_FILECHECK_TYPE_CHK;
	else if (!strncmp(name, "set", 4))
		*type = OCFS2_FILECHECK_TYPE_SET;
	else
		return 1;

	return 0;
}

static int
ocfs2_filecheck_args_parse(const char *name, const char *buf, size_t count,
			   struct ocfs2_filecheck_args *args)
{
	unsigned long val = 0;
	unsigned int type;

	/* too short/long args length */
	if ((count < 1) || (count >= OCFS2_FILECHECK_ARGS_LEN))
		return 1;

	if (ocfs2_filecheck_type_parse(name, &type))
		return 1;
	if (ocfs2_filecheck_args_get_long(buf, count, &val))
		return 1;

	if (val <= 0)
		return 1;

	args->fa_type = type;
	if (type == OCFS2_FILECHECK_TYPE_SET)
		args->fa_len = (unsigned int)val;
	else
		args->fa_ino = val;

	return 0;
}

static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
				    struct kobj_attribute *attr,
				    char *buf)
{

	ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
	unsigned int type;
	struct ocfs2_filecheck_entry *p;
	struct ocfs2_filecheck_sysfs_entry *ent;

	if (ocfs2_filecheck_type_parse(attr->attr.name, &type))
		return -EINVAL;

	ent = ocfs2_filecheck_sysfs_get(kobj->parent->name);
	if (!ent) {
		mlog(ML_ERROR,
		"Cannot get the corresponding entry via device basename %s\n",
		kobj->name);
		return -ENODEV;
	}

	if (type == OCFS2_FILECHECK_TYPE_SET) {
		spin_lock(&ent->fs_fcheck->fc_lock);
		total = snprintf(buf, remain, "%u\n", ent->fs_fcheck->fc_max);
		spin_unlock(&ent->fs_fcheck->fc_lock);
		goto exit;
	}

	ret = snprintf(buf, remain, "INO\t\tDONE\tERROR\n");
	total += ret;
	remain -= ret;
	spin_lock(&ent->fs_fcheck->fc_lock);
	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
		if (p->fe_type != type)
			continue;

		ret = snprintf(buf + total, remain, "%lu\t\t%u\t%s\n",
			       p->fe_ino, p->fe_done,
			       ocfs2_filecheck_error(p->fe_status));
		if (ret < 0) {
			total = ret;
			break;
		}
		if (ret == remain) {
			/* snprintf() didn't fit */
			total = -E2BIG;
			break;
		}
		total += ret;
		remain -= ret;
	}
	spin_unlock(&ent->fs_fcheck->fc_lock);

exit:
	ocfs2_filecheck_sysfs_put(ent);
	return total;
}

static int
ocfs2_filecheck_erase_entry(struct ocfs2_filecheck_sysfs_entry *ent)
{
	struct ocfs2_filecheck_entry *p;

	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
		if (p->fe_done) {
			list_del(&p->fe_list);
			kfree(p);
			ent->fs_fcheck->fc_size--;
			ent->fs_fcheck->fc_done--;
			return 1;
		}
	}

	return 0;
}

static int
ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
			      unsigned int count)
{
	unsigned int i = 0;
	unsigned int ret = 0;

	while (i++ < count) {
		if (ocfs2_filecheck_erase_entry(ent))
			ret++;
		else
			break;
	}

	return (ret == count ? 1 : 0);
}

static void
ocfs2_filecheck_done_entry(struct ocfs2_filecheck_sysfs_entry *ent,
			   struct ocfs2_filecheck_entry *entry)
{
	entry->fe_done = 1;
	spin_lock(&ent->fs_fcheck->fc_lock);
	ent->fs_fcheck->fc_done++;
	spin_unlock(&ent->fs_fcheck->fc_lock);
}

static unsigned int
ocfs2_filecheck_handle(struct super_block *sb,
		       unsigned long ino, unsigned int flags)
{
	unsigned int ret = OCFS2_FILECHECK_ERR_SUCCESS;
	struct inode *inode = NULL;
	int rc;

	inode = ocfs2_iget(OCFS2_SB(sb), ino, flags, 0);
	if (IS_ERR(inode)) {
		rc = (int)(-(long)inode);
		if (rc >= OCFS2_FILECHECK_ERR_START &&
		    rc < OCFS2_FILECHECK_ERR_END)
			ret = rc;
		else
			ret = OCFS2_FILECHECK_ERR_FAILED;
	} else
		iput(inode);

	return ret;
}

static void
ocfs2_filecheck_handle_entry(struct ocfs2_filecheck_sysfs_entry *ent,
			     struct ocfs2_filecheck_entry *entry)
{
	if (entry->fe_type == OCFS2_FILECHECK_TYPE_CHK)
		entry->fe_status = ocfs2_filecheck_handle(ent->fs_sb,
				entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_CHK);
	else if (entry->fe_type == OCFS2_FILECHECK_TYPE_FIX)
		entry->fe_status = ocfs2_filecheck_handle(ent->fs_sb,
				entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_FIX);
	else
		entry->fe_status = OCFS2_FILECHECK_ERR_UNSUPPORTED;

	ocfs2_filecheck_done_entry(ent, entry);
}

static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
				     struct kobj_attribute *attr,
				     const char *buf, size_t count)
{
	struct ocfs2_filecheck_args args;
	struct ocfs2_filecheck_entry *entry;
	struct ocfs2_filecheck_sysfs_entry *ent;
	ssize_t ret = 0;

	if (count == 0)
		return count;

	if (ocfs2_filecheck_args_parse(attr->attr.name, buf, count, &args)) {
		mlog(ML_ERROR, "Invalid arguments for online file check\n");
		return -EINVAL;
	}

	ent = ocfs2_filecheck_sysfs_get(kobj->parent->name);
	if (!ent) {
		mlog(ML_ERROR,
		"Cannot get the corresponding entry via device basename %s\n",
		kobj->parent->name);
		return -ENODEV;
	}

	if (args.fa_type == OCFS2_FILECHECK_TYPE_SET) {
		ret = ocfs2_filecheck_adjust_max(ent, args.fa_len);
		goto exit;
	}

	entry = kmalloc(sizeof(struct ocfs2_filecheck_entry), GFP_NOFS);
	if (!entry) {
		ret = -ENOMEM;
		goto exit;
	}

	spin_lock(&ent->fs_fcheck->fc_lock);
	if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
	    (ent->fs_fcheck->fc_done == 0)) {
		mlog(ML_ERROR,
		"Cannot do more file check "
		"since file check queue(%u) is full now\n",
		ent->fs_fcheck->fc_max);
		ret = -EBUSY;
		kfree(entry);
	} else {
		if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
		    (ent->fs_fcheck->fc_done > 0)) {
			/* Delete the oldest entry which was done,
			 * make sure the entry size in list does
			 * not exceed maximum value
			 */
			BUG_ON(!ocfs2_filecheck_erase_entry(ent));
		}

		entry->fe_ino = args.fa_ino;
		entry->fe_type = args.fa_type;
		entry->fe_done = 0;
		entry->fe_status = OCFS2_FILECHECK_ERR_INPROGRESS;
		list_add_tail(&entry->fe_list, &ent->fs_fcheck->fc_head);
		ent->fs_fcheck->fc_size++;
	}
	spin_unlock(&ent->fs_fcheck->fc_lock);

	if (!ret)
		ocfs2_filecheck_handle_entry(ent, entry);

exit:
	ocfs2_filecheck_sysfs_put(ent);
	return (!ret ? count : ret);
}