xref: /openbmc/linux/fs/ocfs2/filecheck.c (revision 0a94608f) 
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 ATTRIBUTE_GROUPS(ocfs2_filecheck);
98 
99 static void ocfs2_filecheck_release(struct kobject *kobj)
100 {
101 	struct ocfs2_filecheck_sysfs_entry *entry = container_of(kobj,
102 				struct ocfs2_filecheck_sysfs_entry, fs_kobj);
103 
104 	complete(&entry->fs_kobj_unregister);
105 }
106 
107 static ssize_t
108 ocfs2_filecheck_show(struct kobject *kobj, struct attribute *attr, char *buf)
109 {
110 	ssize_t ret = -EIO;
111 	struct kobj_attribute *kattr = container_of(attr,
112 					struct kobj_attribute, attr);
113 
114 	kobject_get(kobj);
115 	if (kattr->show)
116 		ret = kattr->show(kobj, kattr, buf);
117 	kobject_put(kobj);
118 	return ret;
119 }
120 
121 static ssize_t
122 ocfs2_filecheck_store(struct kobject *kobj, struct attribute *attr,
123 			const char *buf, size_t count)
124 {
125 	ssize_t ret = -EIO;
126 	struct kobj_attribute *kattr = container_of(attr,
127 					struct kobj_attribute, attr);
128 
129 	kobject_get(kobj);
130 	if (kattr->store)
131 		ret = kattr->store(kobj, kattr, buf, count);
132 	kobject_put(kobj);
133 	return ret;
134 }
135 
136 static const struct sysfs_ops ocfs2_filecheck_ops = {
137 	.show = ocfs2_filecheck_show,
138 	.store = ocfs2_filecheck_store,
139 };
140 
141 static struct kobj_type ocfs2_ktype_filecheck = {
142 	.default_groups = ocfs2_filecheck_groups,
143 	.sysfs_ops = &ocfs2_filecheck_ops,
144 	.release = ocfs2_filecheck_release,
145 };
146 
147 static void
148 ocfs2_filecheck_sysfs_free(struct ocfs2_filecheck_sysfs_entry *entry)
149 {
150 	struct ocfs2_filecheck_entry *p;
151 
152 	spin_lock(&entry->fs_fcheck->fc_lock);
153 	while (!list_empty(&entry->fs_fcheck->fc_head)) {
154 		p = list_first_entry(&entry->fs_fcheck->fc_head,
155 				     struct ocfs2_filecheck_entry, fe_list);
156 		list_del(&p->fe_list);
157 		BUG_ON(!p->fe_done); /* To free a undone file check entry */
158 		kfree(p);
159 	}
160 	spin_unlock(&entry->fs_fcheck->fc_lock);
161 
162 	kfree(entry->fs_fcheck);
163 	entry->fs_fcheck = NULL;
164 }
165 
166 int ocfs2_filecheck_create_sysfs(struct ocfs2_super *osb)
167 {
168 	int ret;
169 	struct ocfs2_filecheck *fcheck;
170 	struct ocfs2_filecheck_sysfs_entry *entry = &osb->osb_fc_ent;
171 
172 	fcheck = kmalloc(sizeof(struct ocfs2_filecheck), GFP_NOFS);
173 	if (!fcheck)
174 		return -ENOMEM;
175 
176 	INIT_LIST_HEAD(&fcheck->fc_head);
177 	spin_lock_init(&fcheck->fc_lock);
178 	fcheck->fc_max = OCFS2_FILECHECK_MINSIZE;
179 	fcheck->fc_size = 0;
180 	fcheck->fc_done = 0;
181 
182 	entry->fs_kobj.kset = osb->osb_dev_kset;
183 	init_completion(&entry->fs_kobj_unregister);
184 	ret = kobject_init_and_add(&entry->fs_kobj, &ocfs2_ktype_filecheck,
185 					NULL, "filecheck");
186 	if (ret) {
187 		kobject_put(&entry->fs_kobj);
188 		kfree(fcheck);
189 		return ret;
190 	}
191 
192 	entry->fs_fcheck = fcheck;
193 	return 0;
194 }
195 
196 void ocfs2_filecheck_remove_sysfs(struct ocfs2_super *osb)
197 {
198 	if (!osb->osb_fc_ent.fs_fcheck)
199 		return;
200 
201 	kobject_del(&osb->osb_fc_ent.fs_kobj);
202 	kobject_put(&osb->osb_fc_ent.fs_kobj);
203 	wait_for_completion(&osb->osb_fc_ent.fs_kobj_unregister);
204 	ocfs2_filecheck_sysfs_free(&osb->osb_fc_ent);
205 }
206 
207 static int
208 ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
209 			      unsigned int count);
210 static int
211 ocfs2_filecheck_adjust_max(struct ocfs2_filecheck_sysfs_entry *ent,
212 			   unsigned int len)
213 {
214 	int ret;
215 
216 	if ((len < OCFS2_FILECHECK_MINSIZE) || (len > OCFS2_FILECHECK_MAXSIZE))
217 		return -EINVAL;
218 
219 	spin_lock(&ent->fs_fcheck->fc_lock);
220 	if (len < (ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done)) {
221 		mlog(ML_NOTICE,
222 		"Cannot set online file check maximum entry number "
223 		"to %u due to too many pending entries(%u)\n",
224 		len, ent->fs_fcheck->fc_size - ent->fs_fcheck->fc_done);
225 		ret = -EBUSY;
226 	} else {
227 		if (len < ent->fs_fcheck->fc_size)
228 			BUG_ON(!ocfs2_filecheck_erase_entries(ent,
229 				ent->fs_fcheck->fc_size - len));
230 
231 		ent->fs_fcheck->fc_max = len;
232 		ret = 0;
233 	}
234 	spin_unlock(&ent->fs_fcheck->fc_lock);
235 
236 	return ret;
237 }
238 
239 #define OCFS2_FILECHECK_ARGS_LEN	24
240 static int
241 ocfs2_filecheck_args_get_long(const char *buf, size_t count,
242 			      unsigned long *val)
243 {
244 	char buffer[OCFS2_FILECHECK_ARGS_LEN];
245 
246 	memcpy(buffer, buf, count);
247 	buffer[count] = '\0';
248 
249 	if (kstrtoul(buffer, 0, val))
250 		return 1;
251 
252 	return 0;
253 }
254 
255 static int
256 ocfs2_filecheck_type_parse(const char *name, unsigned int *type)
257 {
258 	if (!strncmp(name, "fix", 4))
259 		*type = OCFS2_FILECHECK_TYPE_FIX;
260 	else if (!strncmp(name, "check", 6))
261 		*type = OCFS2_FILECHECK_TYPE_CHK;
262 	else if (!strncmp(name, "set", 4))
263 		*type = OCFS2_FILECHECK_TYPE_SET;
264 	else
265 		return 1;
266 
267 	return 0;
268 }
269 
270 static int
271 ocfs2_filecheck_args_parse(const char *name, const char *buf, size_t count,
272 			   struct ocfs2_filecheck_args *args)
273 {
274 	unsigned long val = 0;
275 	unsigned int type;
276 
277 	/* too short/long args length */
278 	if ((count < 1) || (count >= OCFS2_FILECHECK_ARGS_LEN))
279 		return 1;
280 
281 	if (ocfs2_filecheck_type_parse(name, &type))
282 		return 1;
283 	if (ocfs2_filecheck_args_get_long(buf, count, &val))
284 		return 1;
285 
286 	if (val <= 0)
287 		return 1;
288 
289 	args->fa_type = type;
290 	if (type == OCFS2_FILECHECK_TYPE_SET)
291 		args->fa_len = (unsigned int)val;
292 	else
293 		args->fa_ino = val;
294 
295 	return 0;
296 }
297 
298 static ssize_t ocfs2_filecheck_attr_show(struct kobject *kobj,
299 				    struct kobj_attribute *attr,
300 				    char *buf)
301 {
302 
303 	ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
304 	unsigned int type;
305 	struct ocfs2_filecheck_entry *p;
306 	struct ocfs2_filecheck_sysfs_entry *ent = container_of(kobj,
307 				struct ocfs2_filecheck_sysfs_entry, fs_kobj);
308 
309 	if (ocfs2_filecheck_type_parse(attr->attr.name, &type))
310 		return -EINVAL;
311 
312 	if (type == OCFS2_FILECHECK_TYPE_SET) {
313 		spin_lock(&ent->fs_fcheck->fc_lock);
314 		total = snprintf(buf, remain, "%u\n", ent->fs_fcheck->fc_max);
315 		spin_unlock(&ent->fs_fcheck->fc_lock);
316 		goto exit;
317 	}
318 
319 	ret = snprintf(buf, remain, "INO\t\tDONE\tERROR\n");
320 	total += ret;
321 	remain -= ret;
322 	spin_lock(&ent->fs_fcheck->fc_lock);
323 	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
324 		if (p->fe_type != type)
325 			continue;
326 
327 		ret = snprintf(buf + total, remain, "%lu\t\t%u\t%s\n",
328 			       p->fe_ino, p->fe_done,
329 			       ocfs2_filecheck_error(p->fe_status));
330 		if (ret >= remain) {
331 			/* snprintf() didn't fit */
332 			total = -E2BIG;
333 			break;
334 		}
335 		total += ret;
336 		remain -= ret;
337 	}
338 	spin_unlock(&ent->fs_fcheck->fc_lock);
339 
340 exit:
341 	return total;
342 }
343 
344 static inline int
345 ocfs2_filecheck_is_dup_entry(struct ocfs2_filecheck_sysfs_entry *ent,
346 				unsigned long ino)
347 {
348 	struct ocfs2_filecheck_entry *p;
349 
350 	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
351 		if (!p->fe_done) {
352 			if (p->fe_ino == ino)
353 				return 1;
354 		}
355 	}
356 
357 	return 0;
358 }
359 
360 static inline int
361 ocfs2_filecheck_erase_entry(struct ocfs2_filecheck_sysfs_entry *ent)
362 {
363 	struct ocfs2_filecheck_entry *p;
364 
365 	list_for_each_entry(p, &ent->fs_fcheck->fc_head, fe_list) {
366 		if (p->fe_done) {
367 			list_del(&p->fe_list);
368 			kfree(p);
369 			ent->fs_fcheck->fc_size--;
370 			ent->fs_fcheck->fc_done--;
371 			return 1;
372 		}
373 	}
374 
375 	return 0;
376 }
377 
378 static int
379 ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
380 			      unsigned int count)
381 {
382 	unsigned int i = 0;
383 	unsigned int ret = 0;
384 
385 	while (i++ < count) {
386 		if (ocfs2_filecheck_erase_entry(ent))
387 			ret++;
388 		else
389 			break;
390 	}
391 
392 	return (ret == count ? 1 : 0);
393 }
394 
395 static void
396 ocfs2_filecheck_done_entry(struct ocfs2_filecheck_sysfs_entry *ent,
397 			   struct ocfs2_filecheck_entry *entry)
398 {
399 	spin_lock(&ent->fs_fcheck->fc_lock);
400 	entry->fe_done = 1;
401 	ent->fs_fcheck->fc_done++;
402 	spin_unlock(&ent->fs_fcheck->fc_lock);
403 }
404 
405 static unsigned int
406 ocfs2_filecheck_handle(struct ocfs2_super *osb,
407 		       unsigned long ino, unsigned int flags)
408 {
409 	unsigned int ret = OCFS2_FILECHECK_ERR_SUCCESS;
410 	struct inode *inode = NULL;
411 	int rc;
412 
413 	inode = ocfs2_iget(osb, ino, flags, 0);
414 	if (IS_ERR(inode)) {
415 		rc = (int)(-(long)inode);
416 		if (rc >= OCFS2_FILECHECK_ERR_START &&
417 		    rc < OCFS2_FILECHECK_ERR_END)
418 			ret = rc;
419 		else
420 			ret = OCFS2_FILECHECK_ERR_FAILED;
421 	} else
422 		iput(inode);
423 
424 	return ret;
425 }
426 
427 static void
428 ocfs2_filecheck_handle_entry(struct ocfs2_filecheck_sysfs_entry *ent,
429 			     struct ocfs2_filecheck_entry *entry)
430 {
431 	struct ocfs2_super *osb = container_of(ent, struct ocfs2_super,
432 						osb_fc_ent);
433 
434 	if (entry->fe_type == OCFS2_FILECHECK_TYPE_CHK)
435 		entry->fe_status = ocfs2_filecheck_handle(osb,
436 				entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_CHK);
437 	else if (entry->fe_type == OCFS2_FILECHECK_TYPE_FIX)
438 		entry->fe_status = ocfs2_filecheck_handle(osb,
439 				entry->fe_ino, OCFS2_FI_FLAG_FILECHECK_FIX);
440 	else
441 		entry->fe_status = OCFS2_FILECHECK_ERR_UNSUPPORTED;
442 
443 	ocfs2_filecheck_done_entry(ent, entry);
444 }
445 
446 static ssize_t ocfs2_filecheck_attr_store(struct kobject *kobj,
447 				     struct kobj_attribute *attr,
448 				     const char *buf, size_t count)
449 {
450 	ssize_t ret = 0;
451 	struct ocfs2_filecheck_args args;
452 	struct ocfs2_filecheck_entry *entry;
453 	struct ocfs2_filecheck_sysfs_entry *ent = container_of(kobj,
454 				struct ocfs2_filecheck_sysfs_entry, fs_kobj);
455 
456 	if (count == 0)
457 		return count;
458 
459 	if (ocfs2_filecheck_args_parse(attr->attr.name, buf, count, &args))
460 		return -EINVAL;
461 
462 	if (args.fa_type == OCFS2_FILECHECK_TYPE_SET) {
463 		ret = ocfs2_filecheck_adjust_max(ent, args.fa_len);
464 		goto exit;
465 	}
466 
467 	entry = kmalloc(sizeof(struct ocfs2_filecheck_entry), GFP_NOFS);
468 	if (!entry) {
469 		ret = -ENOMEM;
470 		goto exit;
471 	}
472 
473 	spin_lock(&ent->fs_fcheck->fc_lock);
474 	if (ocfs2_filecheck_is_dup_entry(ent, args.fa_ino)) {
475 		ret = -EEXIST;
476 		kfree(entry);
477 	} else if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
478 		(ent->fs_fcheck->fc_done == 0)) {
479 		mlog(ML_NOTICE,
480 		"Cannot do more file check "
481 		"since file check queue(%u) is full now\n",
482 		ent->fs_fcheck->fc_max);
483 		ret = -EAGAIN;
484 		kfree(entry);
485 	} else {
486 		if ((ent->fs_fcheck->fc_size >= ent->fs_fcheck->fc_max) &&
487 		    (ent->fs_fcheck->fc_done > 0)) {
488 			/* Delete the oldest entry which was done,
489 			 * make sure the entry size in list does
490 			 * not exceed maximum value
491 			 */
492 			BUG_ON(!ocfs2_filecheck_erase_entry(ent));
493 		}
494 
495 		entry->fe_ino = args.fa_ino;
496 		entry->fe_type = args.fa_type;
497 		entry->fe_done = 0;
498 		entry->fe_status = OCFS2_FILECHECK_ERR_INPROGRESS;
499 		list_add_tail(&entry->fe_list, &ent->fs_fcheck->fc_head);
500 		ent->fs_fcheck->fc_size++;
501 	}
502 	spin_unlock(&ent->fs_fcheck->fc_lock);
503 
504 	if (!ret)
505 		ocfs2_filecheck_handle_entry(ent, entry);
506 
507 exit:
508 	return (!ret ? count : ret);
509 }
510