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1// SPDX-License-Identifier: GPL-2.0-only
2/* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * filecheck.c
6 *
7 * Code which implements online file check.
8 *
9 * Copyright (C) 2016 SuSE. All rights reserved.
10 */
11
12#include <linux/list.h>
13#include <linux/spinlock.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/kmod.h>
17#include <linux/fs.h>
18#include <linux/kobject.h>
19#include <linux/sysfs.h>
20#include <linux/sysctl.h>
21#include <cluster/masklog.h>
22
23#include "ocfs2.h"
24#include "ocfs2_fs.h"
25#include "stackglue.h"
26#include "inode.h"
27
28#include "filecheck.h"
29
30
31/* File check error strings,
32 * must correspond with error number in header file.
33 */
34static const char * const ocfs2_filecheck_errs[] = {
35 "SUCCESS",
36 "FAILED",
37 "INPROGRESS",
38 "READONLY",
39 "INJBD",
40 "INVALIDINO",
41 "BLOCKECC",
42 "BLOCKNO",
43 "VALIDFLAG",
44 "GENERATION",
45 "UNSUPPORTED"
46};
47
48struct ocfs2_filecheck_entry {
49 struct list_head fe_list;
50 unsigned long fe_ino;
51 unsigned int fe_type;
52 unsigned int fe_done:1;
53 unsigned int fe_status:31;
54};
55
56struct ocfs2_filecheck_args {
57 unsigned int fa_type;
58 union {
59 unsigned long fa_ino;
60 unsigned int fa_len;
61 };
62};
63
64static const char *
65ocfs2_filecheck_error(int errno)
66{
67 if (!errno)
68 return ocfs2_filecheck_errs[errno];
69
70 BUG_ON(errno < OCFS2_FILECHECK_ERR_START ||
71 errno > OCFS2_FILECHECK_ERR_END);
72 return ocfs2_filecheck_errs[errno - OCFS2_FILECHECK_ERR_START + 1];
73}
74
75static ssize_t ocfs2_filecheck_attr_show(struct kobject *kobj,
76 struct kobj_attribute *attr,
77 char *buf);
78static ssize_t ocfs2_filecheck_attr_store(struct kobject *kobj,
79 struct kobj_attribute *attr,
80 const char *buf, size_t count);
81static struct kobj_attribute ocfs2_filecheck_attr_chk =
82 __ATTR(check, S_IRUSR | S_IWUSR,
83 ocfs2_filecheck_attr_show,
84 ocfs2_filecheck_attr_store);
85static struct kobj_attribute ocfs2_filecheck_attr_fix =
86 __ATTR(fix, S_IRUSR | S_IWUSR,
87 ocfs2_filecheck_attr_show,
88 ocfs2_filecheck_attr_store);
89static struct kobj_attribute ocfs2_filecheck_attr_set =
90 __ATTR(set, S_IRUSR | S_IWUSR,
91 ocfs2_filecheck_attr_show,
92 ocfs2_filecheck_attr_store);
93static struct attribute *ocfs2_filecheck_attrs[] = {
94 &ocfs2_filecheck_attr_chk.attr,
95 &ocfs2_filecheck_attr_fix.attr,
96 &ocfs2_filecheck_attr_set.attr,
97 NULL
98};
99
100static void ocfs2_filecheck_release(struct kobject *kobj)
101{
102 struct ocfs2_filecheck_sysfs_entry *entry = container_of(kobj,
103 struct ocfs2_filecheck_sysfs_entry, fs_kobj);
104
105 complete(&entry->fs_kobj_unregister);
106}
107
108static ssize_t
109ocfs2_filecheck_show(struct kobject *kobj, struct attribute *attr, char *buf)
110{
111 ssize_t ret = -EIO;
112 struct kobj_attribute *kattr = container_of(attr,
113 struct kobj_attribute, attr);
114
115 kobject_get(kobj);
116 if (kattr->show)
117 ret = kattr->show(kobj, kattr, buf);
118 kobject_put(kobj);
119 return ret;
120}
121
122static ssize_t
123ocfs2_filecheck_store(struct kobject *kobj, struct attribute *attr,
124 const char *buf, size_t count)
125{
126 ssize_t ret = -EIO;
127 struct kobj_attribute *kattr = container_of(attr,
128 struct kobj_attribute, attr);
129
130 kobject_get(kobj);
131 if (kattr->store)
132 ret = kattr->store(kobj, kattr, buf, count);
133 kobject_put(kobj);
134 return ret;
135}
136
137static const struct sysfs_ops ocfs2_filecheck_ops = {
138 .show = ocfs2_filecheck_show,
139 .store = ocfs2_filecheck_store,
140};
141
142static struct kobj_type ocfs2_ktype_filecheck = {
143 .default_attrs = ocfs2_filecheck_attrs,
144 .sysfs_ops = &ocfs2_filecheck_ops,
145 .release = ocfs2_filecheck_release,
146};
147
148static void
149ocfs2_filecheck_sysfs_free(struct ocfs2_filecheck_sysfs_entry *entry)
150{
151 struct ocfs2_filecheck_entry *p;
152
153 spin_lock(&entry->fs_fcheck->fc_lock);
154 while (!list_empty(&entry->fs_fcheck->fc_head)) {
155 p = list_first_entry(&entry->fs_fcheck->fc_head,
156 struct ocfs2_filecheck_entry, fe_list);
157 list_del(&p->fe_list);
158 BUG_ON(!p->fe_done); /* To free a undone file check entry */
159 kfree(p);
160 }
161 spin_unlock(&entry->fs_fcheck->fc_lock);
162
163 kfree(entry->fs_fcheck);
164 entry->fs_fcheck = NULL;
165}
166
167int ocfs2_filecheck_create_sysfs(struct ocfs2_super *osb)
168{
169 int ret;
170 struct ocfs2_filecheck *fcheck;
171 struct ocfs2_filecheck_sysfs_entry *entry = &osb->osb_fc_ent;
172
173 fcheck = kmalloc(sizeof(struct ocfs2_filecheck), GFP_NOFS);
174 if (!fcheck)
175 return -ENOMEM;
176
177 INIT_LIST_HEAD(&fcheck->fc_head);
178 spin_lock_init(&fcheck->fc_lock);
179 fcheck->fc_max = OCFS2_FILECHECK_MINSIZE;
180 fcheck->fc_size = 0;
181 fcheck->fc_done = 0;
182
183 entry->fs_kobj.kset = osb->osb_dev_kset;
184 init_completion(&entry->fs_kobj_unregister);
185 ret = kobject_init_and_add(&entry->fs_kobj, &ocfs2_ktype_filecheck,
186 NULL, "filecheck");
187 if (ret) {
188 kobject_put(&entry->fs_kobj);
189 kfree(fcheck);
190 return ret;
191 }
192
193 entry->fs_fcheck = fcheck;
194 return 0;
195}
196
197void ocfs2_filecheck_remove_sysfs(struct ocfs2_super *osb)
198{
199 if (!osb->osb_fc_ent.fs_fcheck)
200 return;
201
202 kobject_del(&osb->osb_fc_ent.fs_kobj);
203 kobject_put(&osb->osb_fc_ent.fs_kobj);
204 wait_for_completion(&osb->osb_fc_ent.fs_kobj_unregister);
205 ocfs2_filecheck_sysfs_free(&osb->osb_fc_ent);
206}
207
208static int
209ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
210 unsigned int count);
211static int
212ocfs2_filecheck_adjust_max(struct ocfs2_filecheck_sysfs_entry *ent,
213 unsigned int len)
214{
215 int ret;
216
217 if ((len < OCFS2_FILECHECK_MINSIZE) || (len > OCFS2_FILECHECK_MAXSIZE))
218 return -EINVAL;
219
220 spin_lock(&ent->fs_fcheck->fc_lock);
221 if (len < (ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done)) {
222 mlog(ML_NOTICE,
223 "Cannot set online file check maximum entry number "
224 "to %u due to too many pending entries(%u)\n",
225 len, ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done);
226 ret = -EBUSY;
227 } else {
228 if (len < ent->fs_fcheck->fc_size)
229 BUG_ON(!ocfs2_filecheck_erase_entries(ent,
230 ent->fs_fcheck->fc_size - len));
231
232 ent->fs_fcheck->fc_max = len;
233 ret = 0;
234 }
235 spin_unlock(&ent->fs_fcheck->fc_lock);
236
237 return ret;
238}
239
240#define OCFS2_FILECHECK_ARGS_LEN 24
241static int
242ocfs2_filecheck_args_get_long(const char *buf, size_t count,
243 unsigned long *val)
244{
245 char buffer[OCFS2_FILECHECK_ARGS_LEN];
246
247 memcpy(buffer, buf, count);
248 buffer[count] = '\0';
249
250 if (kstrtoul(buffer, 0, val))
251 return 1;
252
253 return 0;
254}
255
256static int
257ocfs2_filecheck_type_parse(const char *name, unsigned int *type)
258{
259 if (!strncmp(name, "fix", 4))
260 *type = OCFS2_FILECHECK_TYPE_FIX;
261 else if (!strncmp(name, "check", 6))
262 *type = OCFS2_FILECHECK_TYPE_CHK;
263 else if (!strncmp(name, "set", 4))
264 *type = OCFS2_FILECHECK_TYPE_SET;
265 else
266 return 1;
267
268 return 0;
269}
270
271static int
272ocfs2_filecheck_args_parse(const char *name, const char *buf, size_t count,
273 struct ocfs2_filecheck_args *args)
274{
275 unsigned long val = 0;
276 unsigned int type;
277
278 /* too short/long args length */
279 if ((count < 1) || (count >= OCFS2_FILECHECK_ARGS_LEN))
280 return 1;
281
282 if (ocfs2_filecheck_type_parse(name, &type))
283 return 1;
284 if (ocfs2_filecheck_args_get_long(buf, count, &val))
285 return 1;
286
287 if (val <= 0)
288 return 1;
289
290 args->fa_type = type;
291 if (type == OCFS2_FILECHECK_TYPE_SET)
292 args->fa_len = (unsigned int)val;
293 else
294 args->fa_ino = val;
295
296 return 0;
297}
298
299static ssize_t ocfs2_filecheck_attr_show(struct kobject *kobj,
300 struct kobj_attribute *attr,
301 char *buf)
302{
303
304 ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
305 unsigned int type;
306 struct ocfs2_filecheck_entry *p;
307 struct ocfs2_filecheck_sysfs_entry *ent = container_of(kobj,
308 struct ocfs2_filecheck_sysfs_entry, fs_kobj);
309
310 if (ocfs2_filecheck_type_parse(attr->attr.name, &type))
311 return -EINVAL;
312
313 if (type == OCFS2_FILECHECK_TYPE_SET) {
314 spin_lock(&ent->fs_fcheck->fc_lock);
315 total = snprintf(buf, remain, "%u\n", ent->fs_fcheck->fc_max);
316 spin_unlock(&ent->fs_fcheck->fc_lock);
317 goto exit;
318 }
319
320 ret = snprintf(buf, remain, "INO\t\tDONE\tERROR\n");
321 total += ret;
322 remain -= ret;
323 spin_lock(&ent->fs_fcheck->fc_lock);
324 list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
325 if (p->fe_type != type)
326 continue;
327
328 ret = snprintf(buf + total, remain, "%lu\t\t%u\t%s\n",
329 p->fe_ino, p->fe_done,
330 ocfs2_filecheck_error(p->fe_status));
331 if (ret < 0) {
332 total = ret;
333 break;
334 }
335 if (ret == remain) {
336 /* snprintf() didn't fit */
337 total = -E2BIG;
338 break;
339 }
340 total += ret;
341 remain -= ret;
342 }
343 spin_unlock(&ent->fs_fcheck->fc_lock);
344
345exit:
346 return total;
347}
348
349static inline int
350ocfs2_filecheck_is_dup_entry(struct ocfs2_filecheck_sysfs_entry *ent,
351 unsigned long ino)
352{
353 struct ocfs2_filecheck_entry *p;
354
355 list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
356 if (!p->fe_done) {
357 if (p->fe_ino == ino)
358 return 1;
359 }
360 }
361
362 return 0;
363}
364
365static inline int
366ocfs2_filecheck_erase_entry(struct ocfs2_filecheck_sysfs_entry *ent)
367{
368 struct ocfs2_filecheck_entry *p;
369
370 list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
371 if (p->fe_done) {
372 list_del(&p->fe_list);
373 kfree(p);
374 ent->fs_fcheck->fc_size--;
375 ent->fs_fcheck->fc_done--;
376 return 1;
377 }
378 }
379
380 return 0;
381}
382
383static int
384ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
385 unsigned int count)
386{
387 unsigned int i = 0;
388 unsigned int ret = 0;
389
390 while (i++ < count) {
391 if (ocfs2_filecheck_erase_entry(ent))
392 ret++;
393 else
394 break;
395 }
396
397 return (ret == count ? 1 : 0);
398}
399
400static void
401ocfs2_filecheck_done_entry(struct ocfs2_filecheck_sysfs_entry *ent,
402 struct ocfs2_filecheck_entry *entry)
403{
404 spin_lock(&ent->fs_fcheck->fc_lock);
405 entry->fe_done = 1;
406 ent->fs_fcheck->fc_done++;
407 spin_unlock(&ent->fs_fcheck->fc_lock);
408}
409
410static unsigned int
411ocfs2_filecheck_handle(struct ocfs2_super *osb,
412 unsigned long ino, unsigned int flags)
413{
414 unsigned int ret = OCFS2_FILECHECK_ERR_SUCCESS;
415 struct inode *inode = NULL;
416 int rc;
417
418 inode = ocfs2_iget(osb, ino, flags, 0);
419 if (IS_ERR(inode)) {
420 rc = (int)(-(long)inode);
421 if (rc >= OCFS2_FILECHECK_ERR_START &&
422 rc < OCFS2_FILECHECK_ERR_END)
423 ret = rc;
424 else
425 ret = OCFS2_FILECHECK_ERR_FAILED;
426 } else
427 iput(inode);
428
429 return ret;
430}
431
432static void
433ocfs2_filecheck_handle_entry(struct ocfs2_filecheck_sysfs_entry *ent,
434 struct ocfs2_filecheck_entry *entry)
435{
436 struct ocfs2_super *osb = container_of(ent, struct ocfs2_super,
437 osb_fc_ent);
438
439 if (entry->fe_type == OCFS2_FILECHECK_TYPE_CHK)
440 entry->fe_status = ocfs2_filecheck_handle(osb,
441 entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_CHK);
442 else if (entry->fe_type == OCFS2_FILECHECK_TYPE_FIX)
443 entry->fe_status = ocfs2_filecheck_handle(osb,
444 entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_FIX);
445 else
446 entry->fe_status = OCFS2_FILECHECK_ERR_UNSUPPORTED;
447
448 ocfs2_filecheck_done_entry(ent, entry);
449}
450
451static ssize_t ocfs2_filecheck_attr_store(struct kobject *kobj,
452 struct kobj_attribute *attr,
453 const char *buf, size_t count)
454{
455 ssize_t ret = 0;
456 struct ocfs2_filecheck_args args;
457 struct ocfs2_filecheck_entry *entry;
458 struct ocfs2_filecheck_sysfs_entry *ent = container_of(kobj,
459 struct ocfs2_filecheck_sysfs_entry, fs_kobj);
460
461 if (count == 0)
462 return count;
463
464 if (ocfs2_filecheck_args_parse(attr->attr.name, buf, count, &args))
465 return -EINVAL;
466
467 if (args.fa_type == OCFS2_FILECHECK_TYPE_SET) {
468 ret = ocfs2_filecheck_adjust_max(ent, args.fa_len);
469 goto exit;
470 }
471
472 entry = kmalloc(sizeof(struct ocfs2_filecheck_entry), GFP_NOFS);
473 if (!entry) {
474 ret = -ENOMEM;
475 goto exit;
476 }
477
478 spin_lock(&ent->fs_fcheck->fc_lock);
479 if (ocfs2_filecheck_is_dup_entry(ent, args.fa_ino)) {
480 ret = -EEXIST;
481 kfree(entry);
482 } else if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
483 (ent->fs_fcheck->fc_done == 0)) {
484 mlog(ML_NOTICE,
485 "Cannot do more file check "
486 "since file check queue(%u) is full now\n",
487 ent->fs_fcheck->fc_max);
488 ret = -EAGAIN;
489 kfree(entry);
490 } else {
491 if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
492 (ent->fs_fcheck->fc_done > 0)) {
493 /* Delete the oldest entry which was done,
494 * make sure the entry size in list does
495 * not exceed maximum value
496 */
497 BUG_ON(!ocfs2_filecheck_erase_entry(ent));
498 }
499
500 entry->fe_ino = args.fa_ino;
501 entry->fe_type = args.fa_type;
502 entry->fe_done = 0;
503 entry->fe_status = OCFS2_FILECHECK_ERR_INPROGRESS;
504 list_add_tail(&entry->fe_list, &ent->fs_fcheck->fc_head);
505 ent->fs_fcheck->fc_size++;
506 }
507 spin_unlock(&ent->fs_fcheck->fc_lock);
508
509 if (!ret)
510 ocfs2_filecheck_handle_entry(ent, entry);
511
512exit:
513 return (!ret ? count : ret);
514}
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * filecheck.c
5 *
6 * Code which implements online file check.
7 *
8 * Copyright (C) 2016 SuSE. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation, version 2.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 */
19
20#include <linux/list.h>
21#include <linux/spinlock.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24#include <linux/kmod.h>
25#include <linux/fs.h>
26#include <linux/kobject.h>
27#include <linux/sysfs.h>
28#include <linux/sysctl.h>
29#include <cluster/masklog.h>
30
31#include "ocfs2.h"
32#include "ocfs2_fs.h"
33#include "stackglue.h"
34#include "inode.h"
35
36#include "filecheck.h"
37
38
39/* File check error strings,
40 * must correspond with error number in header file.
41 */
42static const char * const ocfs2_filecheck_errs[] = {
43 "SUCCESS",
44 "FAILED",
45 "INPROGRESS",
46 "READONLY",
47 "INJBD",
48 "INVALIDINO",
49 "BLOCKECC",
50 "BLOCKNO",
51 "VALIDFLAG",
52 "GENERATION",
53 "UNSUPPORTED"
54};
55
56static DEFINE_SPINLOCK(ocfs2_filecheck_sysfs_lock);
57static LIST_HEAD(ocfs2_filecheck_sysfs_list);
58
59struct ocfs2_filecheck {
60 struct list_head fc_head; /* File check entry list head */
61 spinlock_t fc_lock;
62 unsigned int fc_max; /* Maximum number of entry in list */
63 unsigned int fc_size; /* Current entry count in list */
64 unsigned int fc_done; /* Finished entry count in list */
65};
66
67struct ocfs2_filecheck_sysfs_entry { /* sysfs entry per mounting */
68 struct list_head fs_list;
69 atomic_t fs_count;
70 struct super_block *fs_sb;
71 struct kset *fs_devicekset;
72 struct kset *fs_fcheckkset;
73 struct ocfs2_filecheck *fs_fcheck;
74};
75
76#define OCFS2_FILECHECK_MAXSIZE 100
77#define OCFS2_FILECHECK_MINSIZE 10
78
79/* File check operation type */
80enum {
81 OCFS2_FILECHECK_TYPE_CHK = 0, /* Check a file(inode) */
82 OCFS2_FILECHECK_TYPE_FIX, /* Fix a file(inode) */
83 OCFS2_FILECHECK_TYPE_SET = 100 /* Set entry list maximum size */
84};
85
86struct ocfs2_filecheck_entry {
87 struct list_head fe_list;
88 unsigned long fe_ino;
89 unsigned int fe_type;
90 unsigned int fe_done:1;
91 unsigned int fe_status:31;
92};
93
94struct ocfs2_filecheck_args {
95 unsigned int fa_type;
96 union {
97 unsigned long fa_ino;
98 unsigned int fa_len;
99 };
100};
101
102static const char *
103ocfs2_filecheck_error(int errno)
104{
105 if (!errno)
106 return ocfs2_filecheck_errs[errno];
107
108 BUG_ON(errno < OCFS2_FILECHECK_ERR_START ||
109 errno > OCFS2_FILECHECK_ERR_END);
110 return ocfs2_filecheck_errs[errno - OCFS2_FILECHECK_ERR_START + 1];
111}
112
113static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
114 struct kobj_attribute *attr,
115 char *buf);
116static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
117 struct kobj_attribute *attr,
118 const char *buf, size_t count);
119static struct kobj_attribute ocfs2_attr_filecheck_chk =
120 __ATTR(check, S_IRUSR | S_IWUSR,
121 ocfs2_filecheck_show,
122 ocfs2_filecheck_store);
123static struct kobj_attribute ocfs2_attr_filecheck_fix =
124 __ATTR(fix, S_IRUSR | S_IWUSR,
125 ocfs2_filecheck_show,
126 ocfs2_filecheck_store);
127static struct kobj_attribute ocfs2_attr_filecheck_set =
128 __ATTR(set, S_IRUSR | S_IWUSR,
129 ocfs2_filecheck_show,
130 ocfs2_filecheck_store);
131
132static int ocfs2_filecheck_sysfs_wait(atomic_t *p)
133{
134 schedule();
135 return 0;
136}
137
138static void
139ocfs2_filecheck_sysfs_free(struct ocfs2_filecheck_sysfs_entry *entry)
140{
141 struct ocfs2_filecheck_entry *p;
142
143 if (!atomic_dec_and_test(&entry->fs_count))
144 wait_on_atomic_t(&entry->fs_count, ocfs2_filecheck_sysfs_wait,
145 TASK_UNINTERRUPTIBLE);
146
147 spin_lock(&entry->fs_fcheck->fc_lock);
148 while (!list_empty(&entry->fs_fcheck->fc_head)) {
149 p = list_first_entry(&entry->fs_fcheck->fc_head,
150 struct ocfs2_filecheck_entry, fe_list);
151 list_del(&p->fe_list);
152 BUG_ON(!p->fe_done); /* To free a undone file check entry */
153 kfree(p);
154 }
155 spin_unlock(&entry->fs_fcheck->fc_lock);
156
157 kset_unregister(entry->fs_fcheckkset);
158 kset_unregister(entry->fs_devicekset);
159 kfree(entry->fs_fcheck);
160 kfree(entry);
161}
162
163static void
164ocfs2_filecheck_sysfs_add(struct ocfs2_filecheck_sysfs_entry *entry)
165{
166 spin_lock(&ocfs2_filecheck_sysfs_lock);
167 list_add_tail(&entry->fs_list, &ocfs2_filecheck_sysfs_list);
168 spin_unlock(&ocfs2_filecheck_sysfs_lock);
169}
170
171static int ocfs2_filecheck_sysfs_del(const char *devname)
172{
173 struct ocfs2_filecheck_sysfs_entry *p;
174
175 spin_lock(&ocfs2_filecheck_sysfs_lock);
176 list_for_each_entry(p, &ocfs2_filecheck_sysfs_list, fs_list) {
177 if (!strcmp(p->fs_sb->s_id, devname)) {
178 list_del(&p->fs_list);
179 spin_unlock(&ocfs2_filecheck_sysfs_lock);
180 ocfs2_filecheck_sysfs_free(p);
181 return 0;
182 }
183 }
184 spin_unlock(&ocfs2_filecheck_sysfs_lock);
185 return 1;
186}
187
188static void
189ocfs2_filecheck_sysfs_put(struct ocfs2_filecheck_sysfs_entry *entry)
190{
191 if (atomic_dec_and_test(&entry->fs_count))
192 wake_up_atomic_t(&entry->fs_count);
193}
194
195static struct ocfs2_filecheck_sysfs_entry *
196ocfs2_filecheck_sysfs_get(const char *devname)
197{
198 struct ocfs2_filecheck_sysfs_entry *p = NULL;
199
200 spin_lock(&ocfs2_filecheck_sysfs_lock);
201 list_for_each_entry(p, &ocfs2_filecheck_sysfs_list, fs_list) {
202 if (!strcmp(p->fs_sb->s_id, devname)) {
203 atomic_inc(&p->fs_count);
204 spin_unlock(&ocfs2_filecheck_sysfs_lock);
205 return p;
206 }
207 }
208 spin_unlock(&ocfs2_filecheck_sysfs_lock);
209 return NULL;
210}
211
212int ocfs2_filecheck_create_sysfs(struct super_block *sb)
213{
214 int ret = 0;
215 struct kset *device_kset = NULL;
216 struct kset *fcheck_kset = NULL;
217 struct ocfs2_filecheck *fcheck = NULL;
218 struct ocfs2_filecheck_sysfs_entry *entry = NULL;
219 struct attribute **attrs = NULL;
220 struct attribute_group attrgp;
221
222 if (!ocfs2_kset)
223 return -ENOMEM;
224
225 attrs = kmalloc(sizeof(struct attribute *) * 4, GFP_NOFS);
226 if (!attrs) {
227 ret = -ENOMEM;
228 goto error;
229 } else {
230 attrs[0] = &ocfs2_attr_filecheck_chk.attr;
231 attrs[1] = &ocfs2_attr_filecheck_fix.attr;
232 attrs[2] = &ocfs2_attr_filecheck_set.attr;
233 attrs[3] = NULL;
234 memset(&attrgp, 0, sizeof(attrgp));
235 attrgp.attrs = attrs;
236 }
237
238 fcheck = kmalloc(sizeof(struct ocfs2_filecheck), GFP_NOFS);
239 if (!fcheck) {
240 ret = -ENOMEM;
241 goto error;
242 } else {
243 INIT_LIST_HEAD(&fcheck->fc_head);
244 spin_lock_init(&fcheck->fc_lock);
245 fcheck->fc_max = OCFS2_FILECHECK_MINSIZE;
246 fcheck->fc_size = 0;
247 fcheck->fc_done = 0;
248 }
249
250 if (strlen(sb->s_id) <= 0) {
251 mlog(ML_ERROR,
252 "Cannot get device basename when create filecheck sysfs\n");
253 ret = -ENODEV;
254 goto error;
255 }
256
257 device_kset = kset_create_and_add(sb->s_id, NULL, &ocfs2_kset->kobj);
258 if (!device_kset) {
259 ret = -ENOMEM;
260 goto error;
261 }
262
263 fcheck_kset = kset_create_and_add("filecheck", NULL,
264 &device_kset->kobj);
265 if (!fcheck_kset) {
266 ret = -ENOMEM;
267 goto error;
268 }
269
270 ret = sysfs_create_group(&fcheck_kset->kobj, &attrgp);
271 if (ret)
272 goto error;
273
274 entry = kmalloc(sizeof(struct ocfs2_filecheck_sysfs_entry), GFP_NOFS);
275 if (!entry) {
276 ret = -ENOMEM;
277 goto error;
278 } else {
279 atomic_set(&entry->fs_count, 1);
280 entry->fs_sb = sb;
281 entry->fs_devicekset = device_kset;
282 entry->fs_fcheckkset = fcheck_kset;
283 entry->fs_fcheck = fcheck;
284 ocfs2_filecheck_sysfs_add(entry);
285 }
286
287 kfree(attrs);
288 return 0;
289
290error:
291 kfree(attrs);
292 kfree(entry);
293 kfree(fcheck);
294 kset_unregister(fcheck_kset);
295 kset_unregister(device_kset);
296 return ret;
297}
298
299int ocfs2_filecheck_remove_sysfs(struct super_block *sb)
300{
301 return ocfs2_filecheck_sysfs_del(sb->s_id);
302}
303
304static int
305ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
306 unsigned int count);
307static int
308ocfs2_filecheck_adjust_max(struct ocfs2_filecheck_sysfs_entry *ent,
309 unsigned int len)
310{
311 int ret;
312
313 if ((len < OCFS2_FILECHECK_MINSIZE) || (len > OCFS2_FILECHECK_MAXSIZE))
314 return -EINVAL;
315
316 spin_lock(&ent->fs_fcheck->fc_lock);
317 if (len < (ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done)) {
318 mlog(ML_ERROR,
319 "Cannot set online file check maximum entry number "
320 "to %u due to too many pending entries(%u)\n",
321 len, ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done);
322 ret = -EBUSY;
323 } else {
324 if (len < ent->fs_fcheck->fc_size)
325 BUG_ON(!ocfs2_filecheck_erase_entries(ent,
326 ent->fs_fcheck->fc_size - len));
327
328 ent->fs_fcheck->fc_max = len;
329 ret = 0;
330 }
331 spin_unlock(&ent->fs_fcheck->fc_lock);
332
333 return ret;
334}
335
336#define OCFS2_FILECHECK_ARGS_LEN 24
337static int
338ocfs2_filecheck_args_get_long(const char *buf, size_t count,
339 unsigned long *val)
340{
341 char buffer[OCFS2_FILECHECK_ARGS_LEN];
342
343 memcpy(buffer, buf, count);
344 buffer[count] = '\0';
345
346 if (kstrtoul(buffer, 0, val))
347 return 1;
348
349 return 0;
350}
351
352static int
353ocfs2_filecheck_type_parse(const char *name, unsigned int *type)
354{
355 if (!strncmp(name, "fix", 4))
356 *type = OCFS2_FILECHECK_TYPE_FIX;
357 else if (!strncmp(name, "check", 6))
358 *type = OCFS2_FILECHECK_TYPE_CHK;
359 else if (!strncmp(name, "set", 4))
360 *type = OCFS2_FILECHECK_TYPE_SET;
361 else
362 return 1;
363
364 return 0;
365}
366
367static int
368ocfs2_filecheck_args_parse(const char *name, const char *buf, size_t count,
369 struct ocfs2_filecheck_args *args)
370{
371 unsigned long val = 0;
372 unsigned int type;
373
374 /* too short/long args length */
375 if ((count < 1) || (count >= OCFS2_FILECHECK_ARGS_LEN))
376 return 1;
377
378 if (ocfs2_filecheck_type_parse(name, &type))
379 return 1;
380 if (ocfs2_filecheck_args_get_long(buf, count, &val))
381 return 1;
382
383 if (val <= 0)
384 return 1;
385
386 args->fa_type = type;
387 if (type == OCFS2_FILECHECK_TYPE_SET)
388 args->fa_len = (unsigned int)val;
389 else
390 args->fa_ino = val;
391
392 return 0;
393}
394
395static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
396 struct kobj_attribute *attr,
397 char *buf)
398{
399
400 ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
401 unsigned int type;
402 struct ocfs2_filecheck_entry *p;
403 struct ocfs2_filecheck_sysfs_entry *ent;
404
405 if (ocfs2_filecheck_type_parse(attr->attr.name, &type))
406 return -EINVAL;
407
408 ent = ocfs2_filecheck_sysfs_get(kobj->parent->name);
409 if (!ent) {
410 mlog(ML_ERROR,
411 "Cannot get the corresponding entry via device basename %s\n",
412 kobj->name);
413 return -ENODEV;
414 }
415
416 if (type == OCFS2_FILECHECK_TYPE_SET) {
417 spin_lock(&ent->fs_fcheck->fc_lock);
418 total = snprintf(buf, remain, "%u\n", ent->fs_fcheck->fc_max);
419 spin_unlock(&ent->fs_fcheck->fc_lock);
420 goto exit;
421 }
422
423 ret = snprintf(buf, remain, "INO\t\tDONE\tERROR\n");
424 total += ret;
425 remain -= ret;
426 spin_lock(&ent->fs_fcheck->fc_lock);
427 list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
428 if (p->fe_type != type)
429 continue;
430
431 ret = snprintf(buf + total, remain, "%lu\t\t%u\t%s\n",
432 p->fe_ino, p->fe_done,
433 ocfs2_filecheck_error(p->fe_status));
434 if (ret < 0) {
435 total = ret;
436 break;
437 }
438 if (ret == remain) {
439 /* snprintf() didn't fit */
440 total = -E2BIG;
441 break;
442 }
443 total += ret;
444 remain -= ret;
445 }
446 spin_unlock(&ent->fs_fcheck->fc_lock);
447
448exit:
449 ocfs2_filecheck_sysfs_put(ent);
450 return total;
451}
452
453static int
454ocfs2_filecheck_erase_entry(struct ocfs2_filecheck_sysfs_entry *ent)
455{
456 struct ocfs2_filecheck_entry *p;
457
458 list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
459 if (p->fe_done) {
460 list_del(&p->fe_list);
461 kfree(p);
462 ent->fs_fcheck->fc_size--;
463 ent->fs_fcheck->fc_done--;
464 return 1;
465 }
466 }
467
468 return 0;
469}
470
471static int
472ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
473 unsigned int count)
474{
475 unsigned int i = 0;
476 unsigned int ret = 0;
477
478 while (i++ < count) {
479 if (ocfs2_filecheck_erase_entry(ent))
480 ret++;
481 else
482 break;
483 }
484
485 return (ret == count ? 1 : 0);
486}
487
488static void
489ocfs2_filecheck_done_entry(struct ocfs2_filecheck_sysfs_entry *ent,
490 struct ocfs2_filecheck_entry *entry)
491{
492 entry->fe_done = 1;
493 spin_lock(&ent->fs_fcheck->fc_lock);
494 ent->fs_fcheck->fc_done++;
495 spin_unlock(&ent->fs_fcheck->fc_lock);
496}
497
498static unsigned int
499ocfs2_filecheck_handle(struct super_block *sb,
500 unsigned long ino, unsigned int flags)
501{
502 unsigned int ret = OCFS2_FILECHECK_ERR_SUCCESS;
503 struct inode *inode = NULL;
504 int rc;
505
506 inode = ocfs2_iget(OCFS2_SB(sb), ino, flags, 0);
507 if (IS_ERR(inode)) {
508 rc = (int)(-(long)inode);
509 if (rc >= OCFS2_FILECHECK_ERR_START &&
510 rc < OCFS2_FILECHECK_ERR_END)
511 ret = rc;
512 else
513 ret = OCFS2_FILECHECK_ERR_FAILED;
514 } else
515 iput(inode);
516
517 return ret;
518}
519
520static void
521ocfs2_filecheck_handle_entry(struct ocfs2_filecheck_sysfs_entry *ent,
522 struct ocfs2_filecheck_entry *entry)
523{
524 if (entry->fe_type == OCFS2_FILECHECK_TYPE_CHK)
525 entry->fe_status = ocfs2_filecheck_handle(ent->fs_sb,
526 entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_CHK);
527 else if (entry->fe_type == OCFS2_FILECHECK_TYPE_FIX)
528 entry->fe_status = ocfs2_filecheck_handle(ent->fs_sb,
529 entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_FIX);
530 else
531 entry->fe_status = OCFS2_FILECHECK_ERR_UNSUPPORTED;
532
533 ocfs2_filecheck_done_entry(ent, entry);
534}
535
536static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
537 struct kobj_attribute *attr,
538 const char *buf, size_t count)
539{
540 struct ocfs2_filecheck_args args;
541 struct ocfs2_filecheck_entry *entry;
542 struct ocfs2_filecheck_sysfs_entry *ent;
543 ssize_t ret = 0;
544
545 if (count == 0)
546 return count;
547
548 if (ocfs2_filecheck_args_parse(attr->attr.name, buf, count, &args)) {
549 mlog(ML_ERROR, "Invalid arguments for online file check\n");
550 return -EINVAL;
551 }
552
553 ent = ocfs2_filecheck_sysfs_get(kobj->parent->name);
554 if (!ent) {
555 mlog(ML_ERROR,
556 "Cannot get the corresponding entry via device basename %s\n",
557 kobj->parent->name);
558 return -ENODEV;
559 }
560
561 if (args.fa_type == OCFS2_FILECHECK_TYPE_SET) {
562 ret = ocfs2_filecheck_adjust_max(ent, args.fa_len);
563 goto exit;
564 }
565
566 entry = kmalloc(sizeof(struct ocfs2_filecheck_entry), GFP_NOFS);
567 if (!entry) {
568 ret = -ENOMEM;
569 goto exit;
570 }
571
572 spin_lock(&ent->fs_fcheck->fc_lock);
573 if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
574 (ent->fs_fcheck->fc_done == 0)) {
575 mlog(ML_ERROR,
576 "Cannot do more file check "
577 "since file check queue(%u) is full now\n",
578 ent->fs_fcheck->fc_max);
579 ret = -EBUSY;
580 kfree(entry);
581 } else {
582 if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
583 (ent->fs_fcheck->fc_done > 0)) {
584 /* Delete the oldest entry which was done,
585 * make sure the entry size in list does
586 * not exceed maximum value
587 */
588 BUG_ON(!ocfs2_filecheck_erase_entry(ent));
589 }
590
591 entry->fe_ino = args.fa_ino;
592 entry->fe_type = args.fa_type;
593 entry->fe_done = 0;
594 entry->fe_status = OCFS2_FILECHECK_ERR_INPROGRESS;
595 list_add_tail(&entry->fe_list, &ent->fs_fcheck->fc_head);
596 ent->fs_fcheck->fc_size++;
597 }
598 spin_unlock(&ent->fs_fcheck->fc_lock);
599
600 if (!ret)
601 ocfs2_filecheck_handle_entry(ent, entry);
602
603exit:
604 ocfs2_filecheck_sysfs_put(ent);
605 return (!ret ? count : ret);
606}