xref: /openbmc/linux/fs/ocfs2/filecheck.c (revision 28dce2c4) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * filecheck.c
4  *
5  * Code which implements online file check.
6  *
7  * Copyright (C) 2016 SuSE.  All rights reserved.
8  */
9 
10 #include <linux/list.h>
11 #include <linux/spinlock.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/kmod.h>
15 #include <linux/fs.h>
16 #include <linux/kobject.h>
17 #include <linux/sysfs.h>
18 #include <linux/sysctl.h>
19 #include <cluster/masklog.h>
20 
21 #include "ocfs2.h"
22 #include "ocfs2_fs.h"
23 #include "stackglue.h"
24 #include "inode.h"
25 
26 #include "filecheck.h"
27 
28 
29 /* File check error strings,
30  * must correspond with error number in header file.
31  */
32 static const char * const ocfs2_filecheck_errs[] = {
33 	"SUCCESS",
34 	"FAILED",
35 	"INPROGRESS",
36 	"READONLY",
37 	"INJBD",
38 	"INVALIDINO",
39 	"BLOCKECC",
40 	"BLOCKNO",
41 	"VALIDFLAG",
42 	"GENERATION",
43 	"UNSUPPORTED"
44 };
45 
46 struct ocfs2_filecheck_entry {
47 	struct list_head fe_list;
48 	unsigned long fe_ino;
49 	unsigned int fe_type;
50 	unsigned int fe_done:1;
51 	unsigned int fe_status:31;
52 };
53 
54 struct ocfs2_filecheck_args {
55 	unsigned int fa_type;
56 	union {
57 		unsigned long fa_ino;
58 		unsigned int fa_len;
59 	};
60 };
61 
62 static const char *
63 ocfs2_filecheck_error(int errno)
64 {
65 	if (!errno)
66 		return ocfs2_filecheck_errs[errno];
67 
68 	BUG_ON(errno < OCFS2_FILECHECK_ERR_START ||
69 	       errno > OCFS2_FILECHECK_ERR_END);
70 	return ocfs2_filecheck_errs[errno - OCFS2_FILECHECK_ERR_START + 1];
71 }
72 
73 static ssize_t ocfs2_filecheck_attr_show(struct kobject *kobj,
74 					struct kobj_attribute *attr,
75 					char *buf);
76 static ssize_t ocfs2_filecheck_attr_store(struct kobject *kobj,
77 					struct kobj_attribute *attr,
78 					const char *buf, size_t count);
79 static struct kobj_attribute ocfs2_filecheck_attr_chk =
80 					__ATTR(check, S_IRUSR | S_IWUSR,
81 					ocfs2_filecheck_attr_show,
82 					ocfs2_filecheck_attr_store);
83 static struct kobj_attribute ocfs2_filecheck_attr_fix =
84 					__ATTR(fix, S_IRUSR | S_IWUSR,
85 					ocfs2_filecheck_attr_show,
86 					ocfs2_filecheck_attr_store);
87 static struct kobj_attribute ocfs2_filecheck_attr_set =
88 					__ATTR(set, S_IRUSR | S_IWUSR,
89 					ocfs2_filecheck_attr_show,
90 					ocfs2_filecheck_attr_store);
91 static struct attribute *ocfs2_filecheck_attrs[] = {
92 	&ocfs2_filecheck_attr_chk.attr,
93 	&ocfs2_filecheck_attr_fix.attr,
94 	&ocfs2_filecheck_attr_set.attr,
95 	NULL
96 };
97 
98 static void ocfs2_filecheck_release(struct kobject *kobj)
99 {
100 	struct ocfs2_filecheck_sysfs_entry *entry = container_of(kobj,
101 				struct ocfs2_filecheck_sysfs_entry, fs_kobj);
102 
103 	complete(&entry->fs_kobj_unregister);
104 }
105 
106 static ssize_t
107 ocfs2_filecheck_show(struct kobject *kobj, struct attribute *attr, char *buf)
108 {
109 	ssize_t ret = -EIO;
110 	struct kobj_attribute *kattr = container_of(attr,
111 					struct kobj_attribute, attr);
112 
113 	kobject_get(kobj);
114 	if (kattr->show)
115 		ret = kattr->show(kobj, kattr, buf);
116 	kobject_put(kobj);
117 	return ret;
118 }
119 
120 static ssize_t
121 ocfs2_filecheck_store(struct kobject *kobj, struct attribute *attr,
122 			const char *buf, size_t count)
123 {
124 	ssize_t ret = -EIO;
125 	struct kobj_attribute *kattr = container_of(attr,
126 					struct kobj_attribute, attr);
127 
128 	kobject_get(kobj);
129 	if (kattr->store)
130 		ret = kattr->store(kobj, kattr, buf, count);
131 	kobject_put(kobj);
132 	return ret;
133 }
134 
135 static const struct sysfs_ops ocfs2_filecheck_ops = {
136 	.show = ocfs2_filecheck_show,
137 	.store = ocfs2_filecheck_store,
138 };
139 
140 static struct kobj_type ocfs2_ktype_filecheck = {
141 	.default_attrs = ocfs2_filecheck_attrs,
142 	.sysfs_ops = &ocfs2_filecheck_ops,
143 	.release = ocfs2_filecheck_release,
144 };
145 
146 static void
147 ocfs2_filecheck_sysfs_free(struct ocfs2_filecheck_sysfs_entry *entry)
148 {
149 	struct ocfs2_filecheck_entry *p;
150 
151 	spin_lock(&entry->fs_fcheck->fc_lock);
152 	while (!list_empty(&entry->fs_fcheck->fc_head)) {
153 		p = list_first_entry(&entry->fs_fcheck->fc_head,
154 				     struct ocfs2_filecheck_entry, fe_list);
155 		list_del(&p->fe_list);
156 		BUG_ON(!p->fe_done); /* To free a undone file check entry */
157 		kfree(p);
158 	}
159 	spin_unlock(&entry->fs_fcheck->fc_lock);
160 
161 	kfree(entry->fs_fcheck);
162 	entry->fs_fcheck = NULL;
163 }
164 
165 int ocfs2_filecheck_create_sysfs(struct ocfs2_super *osb)
166 {
167 	int ret;
168 	struct ocfs2_filecheck *fcheck;
169 	struct ocfs2_filecheck_sysfs_entry *entry = &osb->osb_fc_ent;
170 
171 	fcheck = kmalloc(sizeof(struct ocfs2_filecheck), GFP_NOFS);
172 	if (!fcheck)
173 		return -ENOMEM;
174 
175 	INIT_LIST_HEAD(&fcheck->fc_head);
176 	spin_lock_init(&fcheck->fc_lock);
177 	fcheck->fc_max = OCFS2_FILECHECK_MINSIZE;
178 	fcheck->fc_size = 0;
179 	fcheck->fc_done = 0;
180 
181 	entry->fs_kobj.kset = osb->osb_dev_kset;
182 	init_completion(&entry->fs_kobj_unregister);
183 	ret = kobject_init_and_add(&entry->fs_kobj, &ocfs2_ktype_filecheck,
184 					NULL, "filecheck");
185 	if (ret) {
186 		kobject_put(&entry->fs_kobj);
187 		kfree(fcheck);
188 		return ret;
189 	}
190 
191 	entry->fs_fcheck = fcheck;
192 	return 0;
193 }
194 
195 void ocfs2_filecheck_remove_sysfs(struct ocfs2_super *osb)
196 {
197 	if (!osb->osb_fc_ent.fs_fcheck)
198 		return;
199 
200 	kobject_del(&osb->osb_fc_ent.fs_kobj);
201 	kobject_put(&osb->osb_fc_ent.fs_kobj);
202 	wait_for_completion(&osb->osb_fc_ent.fs_kobj_unregister);
203 	ocfs2_filecheck_sysfs_free(&osb->osb_fc_ent);
204 }
205 
206 static int
207 ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
208 			      unsigned int count);
209 static int
210 ocfs2_filecheck_adjust_max(struct ocfs2_filecheck_sysfs_entry *ent,
211 			   unsigned int len)
212 {
213 	int ret;
214 
215 	if ((len < OCFS2_FILECHECK_MINSIZE) || (len > OCFS2_FILECHECK_MAXSIZE))
216 		return -EINVAL;
217 
218 	spin_lock(&ent->fs_fcheck->fc_lock);
219 	if (len < (ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done)) {
220 		mlog(ML_NOTICE,
221 		"Cannot set online file check maximum entry number "
222 		"to %u due to too many pending entries(%u)\n",
223 		len, ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done);
224 		ret = -EBUSY;
225 	} else {
226 		if (len < ent->fs_fcheck->fc_size)
227 			BUG_ON(!ocfs2_filecheck_erase_entries(ent,
228 				ent->fs_fcheck->fc_size - len));
229 
230 		ent->fs_fcheck->fc_max = len;
231 		ret = 0;
232 	}
233 	spin_unlock(&ent->fs_fcheck->fc_lock);
234 
235 	return ret;
236 }
237 
238 #define OCFS2_FILECHECK_ARGS_LEN	24
239 static int
240 ocfs2_filecheck_args_get_long(const char *buf, size_t count,
241 			      unsigned long *val)
242 {
243 	char buffer[OCFS2_FILECHECK_ARGS_LEN];
244 
245 	memcpy(buffer, buf, count);
246 	buffer[count] = '\0';
247 
248 	if (kstrtoul(buffer, 0, val))
249 		return 1;
250 
251 	return 0;
252 }
253 
254 static int
255 ocfs2_filecheck_type_parse(const char *name, unsigned int *type)
256 {
257 	if (!strncmp(name, "fix", 4))
258 		*type = OCFS2_FILECHECK_TYPE_FIX;
259 	else if (!strncmp(name, "check", 6))
260 		*type = OCFS2_FILECHECK_TYPE_CHK;
261 	else if (!strncmp(name, "set", 4))
262 		*type = OCFS2_FILECHECK_TYPE_SET;
263 	else
264 		return 1;
265 
266 	return 0;
267 }
268 
269 static int
270 ocfs2_filecheck_args_parse(const char *name, const char *buf, size_t count,
271 			   struct ocfs2_filecheck_args *args)
272 {
273 	unsigned long val = 0;
274 	unsigned int type;
275 
276 	/* too short/long args length */
277 	if ((count < 1) || (count >= OCFS2_FILECHECK_ARGS_LEN))
278 		return 1;
279 
280 	if (ocfs2_filecheck_type_parse(name, &type))
281 		return 1;
282 	if (ocfs2_filecheck_args_get_long(buf, count, &val))
283 		return 1;
284 
285 	if (val <= 0)
286 		return 1;
287 
288 	args->fa_type = type;
289 	if (type == OCFS2_FILECHECK_TYPE_SET)
290 		args->fa_len = (unsigned int)val;
291 	else
292 		args->fa_ino = val;
293 
294 	return 0;
295 }
296 
297 static ssize_t ocfs2_filecheck_attr_show(struct kobject *kobj,
298 				    struct kobj_attribute *attr,
299 				    char *buf)
300 {
301 
302 	ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
303 	unsigned int type;
304 	struct ocfs2_filecheck_entry *p;
305 	struct ocfs2_filecheck_sysfs_entry *ent = container_of(kobj,
306 				struct ocfs2_filecheck_sysfs_entry, fs_kobj);
307 
308 	if (ocfs2_filecheck_type_parse(attr->attr.name, &type))
309 		return -EINVAL;
310 
311 	if (type == OCFS2_FILECHECK_TYPE_SET) {
312 		spin_lock(&ent->fs_fcheck->fc_lock);
313 		total = snprintf(buf, remain, "%u\n", ent->fs_fcheck->fc_max);
314 		spin_unlock(&ent->fs_fcheck->fc_lock);
315 		goto exit;
316 	}
317 
318 	ret = snprintf(buf, remain, "INO\t\tDONE\tERROR\n");
319 	total += ret;
320 	remain -= ret;
321 	spin_lock(&ent->fs_fcheck->fc_lock);
322 	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
323 		if (p->fe_type != type)
324 			continue;
325 
326 		ret = snprintf(buf + total, remain, "%lu\t\t%u\t%s\n",
327 			       p->fe_ino, p->fe_done,
328 			       ocfs2_filecheck_error(p->fe_status));
329 		if (ret < 0) {
330 			total = ret;
331 			break;
332 		}
333 		if (ret == remain) {
334 			/* snprintf() didn't fit */
335 			total = -E2BIG;
336 			break;
337 		}
338 		total += ret;
339 		remain -= ret;
340 	}
341 	spin_unlock(&ent->fs_fcheck->fc_lock);
342 
343 exit:
344 	return total;
345 }
346 
347 static inline int
348 ocfs2_filecheck_is_dup_entry(struct ocfs2_filecheck_sysfs_entry *ent,
349 				unsigned long ino)
350 {
351 	struct ocfs2_filecheck_entry *p;
352 
353 	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
354 		if (!p->fe_done) {
355 			if (p->fe_ino == ino)
356 				return 1;
357 		}
358 	}
359 
360 	return 0;
361 }
362 
363 static inline int
364 ocfs2_filecheck_erase_entry(struct ocfs2_filecheck_sysfs_entry *ent)
365 {
366 	struct ocfs2_filecheck_entry *p;
367 
368 	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
369 		if (p->fe_done) {
370 			list_del(&p->fe_list);
371 			kfree(p);
372 			ent->fs_fcheck->fc_size--;
373 			ent->fs_fcheck->fc_done--;
374 			return 1;
375 		}
376 	}
377 
378 	return 0;
379 }
380 
381 static int
382 ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
383 			      unsigned int count)
384 {
385 	unsigned int i = 0;
386 	unsigned int ret = 0;
387 
388 	while (i++ < count) {
389 		if (ocfs2_filecheck_erase_entry(ent))
390 			ret++;
391 		else
392 			break;
393 	}
394 
395 	return (ret == count ? 1 : 0);
396 }
397 
398 static void
399 ocfs2_filecheck_done_entry(struct ocfs2_filecheck_sysfs_entry *ent,
400 			   struct ocfs2_filecheck_entry *entry)
401 {
402 	spin_lock(&ent->fs_fcheck->fc_lock);
403 	entry->fe_done = 1;
404 	ent->fs_fcheck->fc_done++;
405 	spin_unlock(&ent->fs_fcheck->fc_lock);
406 }
407 
408 static unsigned int
409 ocfs2_filecheck_handle(struct ocfs2_super *osb,
410 		       unsigned long ino, unsigned int flags)
411 {
412 	unsigned int ret = OCFS2_FILECHECK_ERR_SUCCESS;
413 	struct inode *inode = NULL;
414 	int rc;
415 
416 	inode = ocfs2_iget(osb, ino, flags, 0);
417 	if (IS_ERR(inode)) {
418 		rc = (int)(-(long)inode);
419 		if (rc >= OCFS2_FILECHECK_ERR_START &&
420 		    rc < OCFS2_FILECHECK_ERR_END)
421 			ret = rc;
422 		else
423 			ret = OCFS2_FILECHECK_ERR_FAILED;
424 	} else
425 		iput(inode);
426 
427 	return ret;
428 }
429 
430 static void
431 ocfs2_filecheck_handle_entry(struct ocfs2_filecheck_sysfs_entry *ent,
432 			     struct ocfs2_filecheck_entry *entry)
433 {
434 	struct ocfs2_super *osb = container_of(ent, struct ocfs2_super,
435 						osb_fc_ent);
436 
437 	if (entry->fe_type == OCFS2_FILECHECK_TYPE_CHK)
438 		entry->fe_status = ocfs2_filecheck_handle(osb,
439 				entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_CHK);
440 	else if (entry->fe_type == OCFS2_FILECHECK_TYPE_FIX)
441 		entry->fe_status = ocfs2_filecheck_handle(osb,
442 				entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_FIX);
443 	else
444 		entry->fe_status = OCFS2_FILECHECK_ERR_UNSUPPORTED;
445 
446 	ocfs2_filecheck_done_entry(ent, entry);
447 }
448 
449 static ssize_t ocfs2_filecheck_attr_store(struct kobject *kobj,
450 				     struct kobj_attribute *attr,
451 				     const char *buf, size_t count)
452 {
453 	ssize_t ret = 0;
454 	struct ocfs2_filecheck_args args;
455 	struct ocfs2_filecheck_entry *entry;
456 	struct ocfs2_filecheck_sysfs_entry *ent = container_of(kobj,
457 				struct ocfs2_filecheck_sysfs_entry, fs_kobj);
458 
459 	if (count == 0)
460 		return count;
461 
462 	if (ocfs2_filecheck_args_parse(attr->attr.name, buf, count, &args))
463 		return -EINVAL;
464 
465 	if (args.fa_type == OCFS2_FILECHECK_TYPE_SET) {
466 		ret = ocfs2_filecheck_adjust_max(ent, args.fa_len);
467 		goto exit;
468 	}
469 
470 	entry = kmalloc(sizeof(struct ocfs2_filecheck_entry), GFP_NOFS);
471 	if (!entry) {
472 		ret = -ENOMEM;
473 		goto exit;
474 	}
475 
476 	spin_lock(&ent->fs_fcheck->fc_lock);
477 	if (ocfs2_filecheck_is_dup_entry(ent, args.fa_ino)) {
478 		ret = -EEXIST;
479 		kfree(entry);
480 	} else if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
481 		(ent->fs_fcheck->fc_done == 0)) {
482 		mlog(ML_NOTICE,
483 		"Cannot do more file check "
484 		"since file check queue(%u) is full now\n",
485 		ent->fs_fcheck->fc_max);
486 		ret = -EAGAIN;
487 		kfree(entry);
488 	} else {
489 		if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
490 		    (ent->fs_fcheck->fc_done > 0)) {
491 			/* Delete the oldest entry which was done,
492 			 * make sure the entry size in list does
493 			 * not exceed maximum value
494 			 */
495 			BUG_ON(!ocfs2_filecheck_erase_entry(ent));
496 		}
497 
498 		entry->fe_ino = args.fa_ino;
499 		entry->fe_type = args.fa_type;
500 		entry->fe_done = 0;
501 		entry->fe_status = OCFS2_FILECHECK_ERR_INPROGRESS;
502 		list_add_tail(&entry->fe_list, &ent->fs_fcheck->fc_head);
503 		ent->fs_fcheck->fc_size++;
504 	}
505 	spin_unlock(&ent->fs_fcheck->fc_lock);
506 
507 	if (!ret)
508 		ocfs2_filecheck_handle_entry(ent, entry);
509 
510 exit:
511 	return (!ret ? count : ret);
512 }
513