xref: /openbmc/linux/fs/ocfs2/filecheck.c (revision fb574682) 
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  */
34 static 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 
48 struct 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 
56 struct ocfs2_filecheck_args {
57 	unsigned int fa_type;
58 	union {
59 		unsigned long fa_ino;
60 		unsigned int fa_len;
61 	};
62 };
63 
64 static const char *
65 ocfs2_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 
75 static ssize_t ocfs2_filecheck_attr_show(struct kobject *kobj,
76 					struct kobj_attribute *attr,
77 					char *buf);
78 static ssize_t ocfs2_filecheck_attr_store(struct kobject *kobj,
79 					struct kobj_attribute *attr,
80 					const char *buf, size_t count);
81 static struct kobj_attribute ocfs2_filecheck_attr_chk =
82 					__ATTR(check, S_IRUSR | S_IWUSR,
83 					ocfs2_filecheck_attr_show,
84 					ocfs2_filecheck_attr_store);
85 static struct kobj_attribute ocfs2_filecheck_attr_fix =
86 					__ATTR(fix, S_IRUSR | S_IWUSR,
87 					ocfs2_filecheck_attr_show,
88 					ocfs2_filecheck_attr_store);
89 static struct kobj_attribute ocfs2_filecheck_attr_set =
90 					__ATTR(set, S_IRUSR | S_IWUSR,
91 					ocfs2_filecheck_attr_show,
92 					ocfs2_filecheck_attr_store);
93 static 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 
100 static 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 
108 static ssize_t
109 ocfs2_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 
122 static ssize_t
123 ocfs2_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 
137 static const struct sysfs_ops ocfs2_filecheck_ops = {
138 	.show = ocfs2_filecheck_show,
139 	.store = ocfs2_filecheck_store,
140 };
141 
142 static 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 
148 static void
149 ocfs2_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 
167 int 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 
197 void 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 
208 static int
209 ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
210 			      unsigned int count);
211 static int
212 ocfs2_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
241 static int
242 ocfs2_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 
256 static int
257 ocfs2_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 
271 static int
272 ocfs2_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 
299 static 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 
345 exit:
346 	return total;
347 }
348 
349 static inline int
350 ocfs2_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 
365 static inline int
366 ocfs2_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 
383 static int
384 ocfs2_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 
400 static void
401 ocfs2_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 
410 static unsigned int
411 ocfs2_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 
432 static void
433 ocfs2_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 
451 static 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 
512 exit:
513 	return (!ret ? count : ret);
514 }
515