fs/ocfs2/filecheck.c

   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  */
  42 static 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
  56 static DEFINE_SPINLOCK(ocfs2_filecheck_sysfs_lock);
  57 static LIST_HEAD(ocfs2_filecheck_sysfs_list);
  58
  59 struct 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
  67 struct 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 */
  80 enum {
  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
  86 struct 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
  94 struct ocfs2_filecheck_args {
  95         unsigned int fa_type;
  96         union {
  97                 unsigned long fa_ino;
  98                 unsigned int fa_len;
  99         };
 100 };
 101
 102 static const char *
 103 ocfs2_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
 113 static ssize_t ocfs2_filecheck_show(struct kobject *kobj,
 114                                     struct kobj_attribute *attr,
 115                                     char *buf);
 116 static ssize_t ocfs2_filecheck_store(struct kobject *kobj,
 117                                      struct kobj_attribute *attr,
 118                                      const char *buf, size_t count);
 119 static struct kobj_attribute ocfs2_attr_filecheck_chk =
 120                                         __ATTR(check, S_IRUSR | S_IWUSR,
 121                                         ocfs2_filecheck_show,
 122                                         ocfs2_filecheck_store);
 123 static struct kobj_attribute ocfs2_attr_filecheck_fix =
 124                                         __ATTR(fix, S_IRUSR | S_IWUSR,
 125                                         ocfs2_filecheck_show,
 126                                         ocfs2_filecheck_store);
 127 static struct kobj_attribute ocfs2_attr_filecheck_set =
 128                                         __ATTR(set, S_IRUSR | S_IWUSR,
 129                                         ocfs2_filecheck_show,
 130                                         ocfs2_filecheck_store);
 131
 132 static int ocfs2_filecheck_sysfs_wait(atomic_t *p)
 133 {
 134         schedule();
 135         return 0;
 136 }
 137
 138 static void
 139 ocfs2_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
 163 static void
 164 ocfs2_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
 171 static 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
 188 static void
 189 ocfs2_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
 195 static struct ocfs2_filecheck_sysfs_entry *
 196 ocfs2_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
 212 int 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
 290 error:
 291         kfree(attrs);
 292         kfree(entry);
 293         kfree(fcheck);
 294         kset_unregister(fcheck_kset);
 295         kset_unregister(device_kset);
 296         return ret;
 297 }
 298
 299 int ocfs2_filecheck_remove_sysfs(struct super_block *sb)
 300 {
 301         return ocfs2_filecheck_sysfs_del(sb->s_id);
 302 }
 303
 304 static int
 305 ocfs2_filecheck_erase_entries(struct ocfs2_filecheck_sysfs_entry *ent,
 306                               unsigned int count);
 307 static int
 308 ocfs2_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
 337 static int
 338 ocfs2_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
 352 static int
 353 ocfs2_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
 367 static int
 368 ocfs2_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
 395 static 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
 448 exit:
 449         ocfs2_filecheck_sysfs_put(ent);
 450         return total;
 451 }
 452
 453 static int
 454 ocfs2_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
 471 static int
 472 ocfs2_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
 488 static void
 489 ocfs2_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
 498 static unsigned int
 499 ocfs2_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
 520 static void
 521 ocfs2_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
 536 static 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
 603 exit:
 604         ocfs2_filecheck_sysfs_put(ent);
 605         return (!ret ? count : ret);
 606 }