fs/ocfs2/filecheck.c

   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 }