fs/jfs/super.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) International Business Machines Corp., 2000-2004
   4  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   5  */
   6
   7 #include <linux/fs.h>
   8 #include <linux/module.h>
   9 #include <linux/parser.h>
  10 #include <linux/completion.h>
  11 #include <linux/vfs.h>
  12 #include <linux/quotaops.h>
  13 #include <linux/mount.h>
  14 #include <linux/moduleparam.h>
  15 #include <linux/kthread.h>
  16 #include <linux/posix_acl.h>
  17 #include <linux/buffer_head.h>
  18 #include <linux/exportfs.h>
  19 #include <linux/crc32.h>
  20 #include <linux/slab.h>
  21 #include <linux/uaccess.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/blkdev.h>
  24
  25 #include "jfs_incore.h"
  26 #include "jfs_filsys.h"
  27 #include "jfs_inode.h"
  28 #include "jfs_metapage.h"
  29 #include "jfs_superblock.h"
  30 #include "jfs_dmap.h"
  31 #include "jfs_imap.h"
  32 #include "jfs_acl.h"
  33 #include "jfs_debug.h"
  34 #include "jfs_xattr.h"
  35 #include "jfs_dinode.h"
  36
  37 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  38 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  39 MODULE_LICENSE("GPL");
  40
  41 static struct kmem_cache *jfs_inode_cachep;
  42
  43 static const struct super_operations jfs_super_operations;
  44 static const struct export_operations jfs_export_operations;
  45 static struct file_system_type jfs_fs_type;
  46
  47 #define MAX_COMMIT_THREADS 64
  48 static int commit_threads;
  49 module_param(commit_threads, int, 0);
  50 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  51
  52 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  53 struct task_struct *jfsIOthread;
  54 struct task_struct *jfsSyncThread;
  55
  56 #ifdef CONFIG_JFS_DEBUG
  57 int jfsloglevel = JFS_LOGLEVEL_WARN;
  58 module_param(jfsloglevel, int, 0644);
  59 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  60 #endif
  61
  62 static void jfs_handle_error(struct super_block *sb)
  63 {
  64         struct jfs_sb_info *sbi = JFS_SBI(sb);
  65
  66         if (sb_rdonly(sb))
  67                 return;
  68
  69         updateSuper(sb, FM_DIRTY);
  70
  71         if (sbi->flag & JFS_ERR_PANIC)
  72                 panic("JFS (device %s): panic forced after error\n",
  73                         sb->s_id);
  74         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  75                 jfs_err("ERROR: (device %s): remounting filesystem as read-only",
  76                         sb->s_id);
  77                 sb->s_flags |= SB_RDONLY;
  78         }
  79
  80         /* nothing is done for continue beyond marking the superblock dirty */
  81 }
  82
  83 void jfs_error(struct super_block *sb, const char *fmt, ...)
  84 {
  85         struct va_format vaf;
  86         va_list args;
  87
  88         va_start(args, fmt);
  89
  90         vaf.fmt = fmt;
  91         vaf.va = &args;
  92
  93         pr_err("ERROR: (device %s): %ps: %pV\n",
  94                sb->s_id, __builtin_return_address(0), &vaf);
  95
  96         va_end(args);
  97
  98         jfs_handle_error(sb);
  99 }
 100
 101 static struct inode *jfs_alloc_inode(struct super_block *sb)
 102 {
 103         struct jfs_inode_info *jfs_inode;
 104
 105         jfs_inode = alloc_inode_sb(sb, jfs_inode_cachep, GFP_NOFS);
 106         if (!jfs_inode)
 107                 return NULL;
 108 #ifdef CONFIG_QUOTA
 109         memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot));
 110 #endif
 111         return &jfs_inode->vfs_inode;
 112 }
 113
 114 static void jfs_free_inode(struct inode *inode)
 115 {
 116         kmem_cache_free(jfs_inode_cachep, JFS_IP(inode));
 117 }
 118
 119 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 120 {
 121         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 122         s64 maxinodes;
 123         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 124
 125         jfs_info("In jfs_statfs");
 126         buf->f_type = JFS_SUPER_MAGIC;
 127         buf->f_bsize = sbi->bsize;
 128         buf->f_blocks = sbi->bmap->db_mapsize;
 129         buf->f_bfree = sbi->bmap->db_nfree;
 130         buf->f_bavail = sbi->bmap->db_nfree;
 131         /*
 132          * If we really return the number of allocated & free inodes, some
 133          * applications will fail because they won't see enough free inodes.
 134          * We'll try to calculate some guess as to how many inodes we can
 135          * really allocate
 136          *
 137          * buf->f_files = atomic_read(&imap->im_numinos);
 138          * buf->f_ffree = atomic_read(&imap->im_numfree);
 139          */
 140         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 141                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 142                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 143         buf->f_files = maxinodes;
 144         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 145                                     atomic_read(&imap->im_numfree));
 146         buf->f_fsid.val[0] = crc32_le(0, (char *)&sbi->uuid,
 147                                       sizeof(sbi->uuid)/2);
 148         buf->f_fsid.val[1] = crc32_le(0,
 149                                       (char *)&sbi->uuid + sizeof(sbi->uuid)/2,
 150                                       sizeof(sbi->uuid)/2);
 151
 152         buf->f_namelen = JFS_NAME_MAX;
 153         return 0;
 154 }
 155
 156 #ifdef CONFIG_QUOTA
 157 static int jfs_quota_off(struct super_block *sb, int type);
 158 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
 159                         const struct path *path);
 160
 161 static void jfs_quota_off_umount(struct super_block *sb)
 162 {
 163         int type;
 164
 165         for (type = 0; type < MAXQUOTAS; type++)
 166                 jfs_quota_off(sb, type);
 167 }
 168
 169 static const struct quotactl_ops jfs_quotactl_ops = {
 170         .quota_on       = jfs_quota_on,
 171         .quota_off      = jfs_quota_off,
 172         .quota_sync     = dquot_quota_sync,
 173         .get_state      = dquot_get_state,
 174         .set_info       = dquot_set_dqinfo,
 175         .get_dqblk      = dquot_get_dqblk,
 176         .set_dqblk      = dquot_set_dqblk,
 177         .get_nextdqblk  = dquot_get_next_dqblk,
 178 };
 179 #else
 180 static inline void jfs_quota_off_umount(struct super_block *sb)
 181 {
 182 }
 183 #endif
 184
 185 static void jfs_put_super(struct super_block *sb)
 186 {
 187         struct jfs_sb_info *sbi = JFS_SBI(sb);
 188         int rc;
 189
 190         jfs_info("In jfs_put_super");
 191
 192         jfs_quota_off_umount(sb);
 193
 194         rc = jfs_umount(sb);
 195         if (rc)
 196                 jfs_err("jfs_umount failed with return code %d", rc);
 197
 198         unload_nls(sbi->nls_tab);
 199
 200         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 201         iput(sbi->direct_inode);
 202
 203         kfree(sbi);
 204 }
 205
 206 enum {
 207         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 208         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 209         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
 210         Opt_discard, Opt_nodiscard, Opt_discard_minblk
 211 };
 212
 213 static const match_table_t tokens = {
 214         {Opt_integrity, "integrity"},
 215         {Opt_nointegrity, "nointegrity"},
 216         {Opt_iocharset, "iocharset=%s"},
 217         {Opt_resize, "resize=%u"},
 218         {Opt_resize_nosize, "resize"},
 219         {Opt_errors, "errors=%s"},
 220         {Opt_ignore, "noquota"},
 221         {Opt_quota, "quota"},
 222         {Opt_usrquota, "usrquota"},
 223         {Opt_grpquota, "grpquota"},
 224         {Opt_uid, "uid=%u"},
 225         {Opt_gid, "gid=%u"},
 226         {Opt_umask, "umask=%u"},
 227         {Opt_discard, "discard"},
 228         {Opt_nodiscard, "nodiscard"},
 229         {Opt_discard_minblk, "discard=%u"},
 230         {Opt_err, NULL}
 231 };
 232
 233 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 234                          int *flag)
 235 {
 236         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 237         char *p;
 238         struct jfs_sb_info *sbi = JFS_SBI(sb);
 239
 240         *newLVSize = 0;
 241
 242         if (!options)
 243                 return 1;
 244
 245         while ((p = strsep(&options, ",")) != NULL) {
 246                 substring_t args[MAX_OPT_ARGS];
 247                 int token;
 248                 if (!*p)
 249                         continue;
 250
 251                 token = match_token(p, tokens, args);
 252                 switch (token) {
 253                 case Opt_integrity:
 254                         *flag &= ~JFS_NOINTEGRITY;
 255                         break;
 256                 case Opt_nointegrity:
 257                         *flag |= JFS_NOINTEGRITY;
 258                         break;
 259                 case Opt_ignore:
 260                         /* Silently ignore the quota options */
 261                         /* Don't do anything ;-) */
 262                         break;
 263                 case Opt_iocharset:
 264                         if (nls_map && nls_map != (void *) -1)
 265                                 unload_nls(nls_map);
 266                         if (!strcmp(args[0].from, "none"))
 267                                 nls_map = NULL;
 268                         else {
 269                                 nls_map = load_nls(args[0].from);
 270                                 if (!nls_map) {
 271                                         pr_err("JFS: charset not found\n");
 272                                         goto cleanup;
 273                                 }
 274                         }
 275                         break;
 276                 case Opt_resize:
 277                 {
 278                         char *resize = args[0].from;
 279                         int rc = kstrtoll(resize, 0, newLVSize);
 280
 281                         if (rc)
 282                                 goto cleanup;
 283                         break;
 284                 }
 285                 case Opt_resize_nosize:
 286                 {
 287                         *newLVSize = sb_bdev_nr_blocks(sb);
 288                         if (*newLVSize == 0)
 289                                 pr_err("JFS: Cannot determine volume size\n");
 290                         break;
 291                 }
 292                 case Opt_errors:
 293                 {
 294                         char *errors = args[0].from;
 295                         if (!errors || !*errors)
 296                                 goto cleanup;
 297                         if (!strcmp(errors, "continue")) {
 298                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 299                                 *flag &= ~JFS_ERR_PANIC;
 300                                 *flag |= JFS_ERR_CONTINUE;
 301                         } else if (!strcmp(errors, "remount-ro")) {
 302                                 *flag &= ~JFS_ERR_CONTINUE;
 303                                 *flag &= ~JFS_ERR_PANIC;
 304                                 *flag |= JFS_ERR_REMOUNT_RO;
 305                         } else if (!strcmp(errors, "panic")) {
 306                                 *flag &= ~JFS_ERR_CONTINUE;
 307                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 308                                 *flag |= JFS_ERR_PANIC;
 309                         } else {
 310                                 pr_err("JFS: %s is an invalid error handler\n",
 311                                        errors);
 312                                 goto cleanup;
 313                         }
 314                         break;
 315                 }
 316
 317 #ifdef CONFIG_QUOTA
 318                 case Opt_quota:
 319                 case Opt_usrquota:
 320                         *flag |= JFS_USRQUOTA;
 321                         break;
 322                 case Opt_grpquota:
 323                         *flag |= JFS_GRPQUOTA;
 324                         break;
 325 #else
 326                 case Opt_usrquota:
 327                 case Opt_grpquota:
 328                 case Opt_quota:
 329                         pr_err("JFS: quota operations not supported\n");
 330                         break;
 331 #endif
 332                 case Opt_uid:
 333                 {
 334                         char *uid = args[0].from;
 335                         uid_t val;
 336                         int rc = kstrtouint(uid, 0, &val);
 337
 338                         if (rc)
 339                                 goto cleanup;
 340                         sbi->uid = make_kuid(current_user_ns(), val);
 341                         if (!uid_valid(sbi->uid))
 342                                 goto cleanup;
 343                         break;
 344                 }
 345
 346                 case Opt_gid:
 347                 {
 348                         char *gid = args[0].from;
 349                         gid_t val;
 350                         int rc = kstrtouint(gid, 0, &val);
 351
 352                         if (rc)
 353                                 goto cleanup;
 354                         sbi->gid = make_kgid(current_user_ns(), val);
 355                         if (!gid_valid(sbi->gid))
 356                                 goto cleanup;
 357                         break;
 358                 }
 359
 360                 case Opt_umask:
 361                 {
 362                         char *umask = args[0].from;
 363                         int rc = kstrtouint(umask, 8, &sbi->umask);
 364
 365                         if (rc)
 366                                 goto cleanup;
 367                         if (sbi->umask & ~0777) {
 368                                 pr_err("JFS: Invalid value of umask\n");
 369                                 goto cleanup;
 370                         }
 371                         break;
 372                 }
 373
 374                 case Opt_discard:
 375                 {
 376                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 377                         /* if set to 1, even copying files will cause
 378                          * trimming :O
 379                          * -> user has more control over the online trimming
 380                          */
 381                         sbi->minblks_trim = 64;
 382                         if (blk_queue_discard(q))
 383                                 *flag |= JFS_DISCARD;
 384                         else
 385                                 pr_err("JFS: discard option not supported on device\n");
 386                         break;
 387                 }
 388
 389                 case Opt_nodiscard:
 390                         *flag &= ~JFS_DISCARD;
 391                         break;
 392
 393                 case Opt_discard_minblk:
 394                 {
 395                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 396                         char *minblks_trim = args[0].from;
 397                         int rc;
 398                         if (blk_queue_discard(q)) {
 399                                 *flag |= JFS_DISCARD;
 400                                 rc = kstrtouint(minblks_trim, 0,
 401                                                 &sbi->minblks_trim);
 402                                 if (rc)
 403                                         goto cleanup;
 404                         } else
 405                                 pr_err("JFS: discard option not supported on device\n");
 406                         break;
 407                 }
 408
 409                 default:
 410                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
 411                                p);
 412                         goto cleanup;
 413                 }
 414         }
 415
 416         if (nls_map != (void *) -1) {
 417                 /* Discard old (if remount) */
 418                 unload_nls(sbi->nls_tab);
 419                 sbi->nls_tab = nls_map;
 420         }
 421         return 1;
 422
 423 cleanup:
 424         if (nls_map && nls_map != (void *) -1)
 425                 unload_nls(nls_map);
 426         return 0;
 427 }
 428
 429 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 430 {
 431         s64 newLVSize = 0;
 432         int rc = 0;
 433         int flag = JFS_SBI(sb)->flag;
 434         int ret;
 435
 436         sync_filesystem(sb);
 437         if (!parse_options(data, sb, &newLVSize, &flag))
 438                 return -EINVAL;
 439
 440         if (newLVSize) {
 441                 if (sb_rdonly(sb)) {
 442                         pr_err("JFS: resize requires volume to be mounted read-write\n");
 443                         return -EROFS;
 444                 }
 445                 rc = jfs_extendfs(sb, newLVSize, 0);
 446                 if (rc)
 447                         return rc;
 448         }
 449
 450         if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
 451                 /*
 452                  * Invalidate any previously read metadata.  fsck may have
 453                  * changed the on-disk data since we mounted r/o
 454                  */
 455                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 456
 457                 JFS_SBI(sb)->flag = flag;
 458                 ret = jfs_mount_rw(sb, 1);
 459
 460                 /* mark the fs r/w for quota activity */
 461                 sb->s_flags &= ~SB_RDONLY;
 462
 463                 dquot_resume(sb, -1);
 464                 return ret;
 465         }
 466         if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
 467                 rc = dquot_suspend(sb, -1);
 468                 if (rc < 0)
 469                         return rc;
 470                 rc = jfs_umount_rw(sb);
 471                 JFS_SBI(sb)->flag = flag;
 472                 return rc;
 473         }
 474         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 475                 if (!sb_rdonly(sb)) {
 476                         rc = jfs_umount_rw(sb);
 477                         if (rc)
 478                                 return rc;
 479
 480                         JFS_SBI(sb)->flag = flag;
 481                         ret = jfs_mount_rw(sb, 1);
 482                         return ret;
 483                 }
 484         JFS_SBI(sb)->flag = flag;
 485
 486         return 0;
 487 }
 488
 489 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 490 {
 491         struct jfs_sb_info *sbi;
 492         struct inode *inode;
 493         int rc;
 494         s64 newLVSize = 0;
 495         int flag, ret = -EINVAL;
 496
 497         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 498
 499         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
 500         if (!sbi)
 501                 return -ENOMEM;
 502
 503         sb->s_fs_info = sbi;
 504         sb->s_max_links = JFS_LINK_MAX;
 505         sb->s_time_min = 0;
 506         sb->s_time_max = U32_MAX;
 507         sbi->sb = sb;
 508         sbi->uid = INVALID_UID;
 509         sbi->gid = INVALID_GID;
 510         sbi->umask = -1;
 511
 512         /* initialize the mount flag and determine the default error handler */
 513         flag = JFS_ERR_REMOUNT_RO;
 514
 515         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 516                 goto out_kfree;
 517         sbi->flag = flag;
 518
 519 #ifdef CONFIG_JFS_POSIX_ACL
 520         sb->s_flags |= SB_POSIXACL;
 521 #endif
 522
 523         if (newLVSize) {
 524                 pr_err("resize option for remount only\n");
 525                 goto out_kfree;
 526         }
 527
 528         /*
 529          * Initialize blocksize to 4K.
 530          */
 531         sb_set_blocksize(sb, PSIZE);
 532
 533         /*
 534          * Set method vectors.
 535          */
 536         sb->s_op = &jfs_super_operations;
 537         sb->s_export_op = &jfs_export_operations;
 538         sb->s_xattr = jfs_xattr_handlers;
 539 #ifdef CONFIG_QUOTA
 540         sb->dq_op = &dquot_operations;
 541         sb->s_qcop = &jfs_quotactl_ops;
 542         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 543 #endif
 544
 545         /*
 546          * Initialize direct-mapping inode/address-space
 547          */
 548         inode = new_inode(sb);
 549         if (inode == NULL) {
 550                 ret = -ENOMEM;
 551                 goto out_unload;
 552         }
 553         inode->i_size = bdev_nr_bytes(sb->s_bdev);
 554         inode->i_mapping->a_ops = &jfs_metapage_aops;
 555         inode_fake_hash(inode);
 556         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 557
 558         sbi->direct_inode = inode;
 559
 560         rc = jfs_mount(sb);
 561         if (rc) {
 562                 if (!silent)
 563                         jfs_err("jfs_mount failed w/return code = %d", rc);
 564                 goto out_mount_failed;
 565         }
 566         if (sb_rdonly(sb))
 567                 sbi->log = NULL;
 568         else {
 569                 rc = jfs_mount_rw(sb, 0);
 570                 if (rc) {
 571                         if (!silent) {
 572                                 jfs_err("jfs_mount_rw failed, return code = %d",
 573                                         rc);
 574                         }
 575                         goto out_no_rw;
 576                 }
 577         }
 578
 579         sb->s_magic = JFS_SUPER_MAGIC;
 580
 581         if (sbi->mntflag & JFS_OS2)
 582                 sb->s_d_op = &jfs_ci_dentry_operations;
 583
 584         inode = jfs_iget(sb, ROOT_I);
 585         if (IS_ERR(inode)) {
 586                 ret = PTR_ERR(inode);
 587                 goto out_no_rw;
 588         }
 589         sb->s_root = d_make_root(inode);
 590         if (!sb->s_root)
 591                 goto out_no_root;
 592
 593         /* logical blocks are represented by 40 bits in pxd_t, etc.
 594          * and page cache is indexed by long
 595          */
 596         sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
 597         sb->s_time_gran = 1;
 598         return 0;
 599
 600 out_no_root:
 601         jfs_err("jfs_read_super: get root dentry failed");
 602
 603 out_no_rw:
 604         rc = jfs_umount(sb);
 605         if (rc)
 606                 jfs_err("jfs_umount failed with return code %d", rc);
 607 out_mount_failed:
 608         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 609         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 610         make_bad_inode(sbi->direct_inode);
 611         iput(sbi->direct_inode);
 612         sbi->direct_inode = NULL;
 613 out_unload:
 614         unload_nls(sbi->nls_tab);
 615 out_kfree:
 616         kfree(sbi);
 617         return ret;
 618 }
 619
 620 static int jfs_freeze(struct super_block *sb)
 621 {
 622         struct jfs_sb_info *sbi = JFS_SBI(sb);
 623         struct jfs_log *log = sbi->log;
 624         int rc = 0;
 625
 626         if (!sb_rdonly(sb)) {
 627                 txQuiesce(sb);
 628                 rc = lmLogShutdown(log);
 629                 if (rc) {
 630                         jfs_error(sb, "lmLogShutdown failed\n");
 631
 632                         /* let operations fail rather than hang */
 633                         txResume(sb);
 634
 635                         return rc;
 636                 }
 637                 rc = updateSuper(sb, FM_CLEAN);
 638                 if (rc) {
 639                         jfs_err("jfs_freeze: updateSuper failed");
 640                         /*
 641                          * Don't fail here. Everything succeeded except
 642                          * marking the superblock clean, so there's really
 643                          * no harm in leaving it frozen for now.
 644                          */
 645                 }
 646         }
 647         return 0;
 648 }
 649
 650 static int jfs_unfreeze(struct super_block *sb)
 651 {
 652         struct jfs_sb_info *sbi = JFS_SBI(sb);
 653         struct jfs_log *log = sbi->log;
 654         int rc = 0;
 655
 656         if (!sb_rdonly(sb)) {
 657                 rc = updateSuper(sb, FM_MOUNT);
 658                 if (rc) {
 659                         jfs_error(sb, "updateSuper failed\n");
 660                         goto out;
 661                 }
 662                 rc = lmLogInit(log);
 663                 if (rc)
 664                         jfs_error(sb, "lmLogInit failed\n");
 665 out:
 666                 txResume(sb);
 667         }
 668         return rc;
 669 }
 670
 671 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 672         int flags, const char *dev_name, void *data)
 673 {
 674         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 675 }
 676
 677 static int jfs_sync_fs(struct super_block *sb, int wait)
 678 {
 679         struct jfs_log *log = JFS_SBI(sb)->log;
 680
 681         /* log == NULL indicates read-only mount */
 682         if (log) {
 683                 /*
 684                  * Write quota structures to quota file, sync_blockdev() will
 685                  * write them to disk later
 686                  */
 687                 dquot_writeback_dquots(sb, -1);
 688                 jfs_flush_journal(log, wait);
 689                 jfs_syncpt(log, 0);
 690         }
 691
 692         return 0;
 693 }
 694
 695 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 696 {
 697         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 698
 699         if (uid_valid(sbi->uid))
 700                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 701         if (gid_valid(sbi->gid))
 702                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 703         if (sbi->umask != -1)
 704                 seq_printf(seq, ",umask=%03o", sbi->umask);
 705         if (sbi->flag & JFS_NOINTEGRITY)
 706                 seq_puts(seq, ",nointegrity");
 707         if (sbi->flag & JFS_DISCARD)
 708                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 709         if (sbi->nls_tab)
 710                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 711         if (sbi->flag & JFS_ERR_CONTINUE)
 712                 seq_printf(seq, ",errors=continue");
 713         if (sbi->flag & JFS_ERR_PANIC)
 714                 seq_printf(seq, ",errors=panic");
 715
 716 #ifdef CONFIG_QUOTA
 717         if (sbi->flag & JFS_USRQUOTA)
 718                 seq_puts(seq, ",usrquota");
 719
 720         if (sbi->flag & JFS_GRPQUOTA)
 721                 seq_puts(seq, ",grpquota");
 722 #endif
 723
 724         return 0;
 725 }
 726
 727 #ifdef CONFIG_QUOTA
 728
 729 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 730  * acquiring the locks... As quota files are never truncated and quota code
 731  * itself serializes the operations (and no one else should touch the files)
 732  * we don't have to be afraid of races */
 733 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 734                               size_t len, loff_t off)
 735 {
 736         struct inode *inode = sb_dqopt(sb)->files[type];
 737         sector_t blk = off >> sb->s_blocksize_bits;
 738         int err = 0;
 739         int offset = off & (sb->s_blocksize - 1);
 740         int tocopy;
 741         size_t toread;
 742         struct buffer_head tmp_bh;
 743         struct buffer_head *bh;
 744         loff_t i_size = i_size_read(inode);
 745
 746         if (off > i_size)
 747                 return 0;
 748         if (off+len > i_size)
 749                 len = i_size-off;
 750         toread = len;
 751         while (toread > 0) {
 752                 tocopy = sb->s_blocksize - offset < toread ?
 753                                 sb->s_blocksize - offset : toread;
 754
 755                 tmp_bh.b_state = 0;
 756                 tmp_bh.b_size = i_blocksize(inode);
 757                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 758                 if (err)
 759                         return err;
 760                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 761                         memset(data, 0, tocopy);
 762                 else {
 763                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 764                         if (!bh)
 765                                 return -EIO;
 766                         memcpy(data, bh->b_data+offset, tocopy);
 767                         brelse(bh);
 768                 }
 769                 offset = 0;
 770                 toread -= tocopy;
 771                 data += tocopy;
 772                 blk++;
 773         }
 774         return len;
 775 }
 776
 777 /* Write to quotafile */
 778 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 779                                const char *data, size_t len, loff_t off)
 780 {
 781         struct inode *inode = sb_dqopt(sb)->files[type];
 782         sector_t blk = off >> sb->s_blocksize_bits;
 783         int err = 0;
 784         int offset = off & (sb->s_blocksize - 1);
 785         int tocopy;
 786         size_t towrite = len;
 787         struct buffer_head tmp_bh;
 788         struct buffer_head *bh;
 789
 790         inode_lock(inode);
 791         while (towrite > 0) {
 792                 tocopy = sb->s_blocksize - offset < towrite ?
 793                                 sb->s_blocksize - offset : towrite;
 794
 795                 tmp_bh.b_state = 0;
 796                 tmp_bh.b_size = i_blocksize(inode);
 797                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 798                 if (err)
 799                         goto out;
 800                 if (offset || tocopy != sb->s_blocksize)
 801                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 802                 else
 803                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 804                 if (!bh) {
 805                         err = -EIO;
 806                         goto out;
 807                 }
 808                 lock_buffer(bh);
 809                 memcpy(bh->b_data+offset, data, tocopy);
 810                 flush_dcache_page(bh->b_page);
 811                 set_buffer_uptodate(bh);
 812                 mark_buffer_dirty(bh);
 813                 unlock_buffer(bh);
 814                 brelse(bh);
 815                 offset = 0;
 816                 towrite -= tocopy;
 817                 data += tocopy;
 818                 blk++;
 819         }
 820 out:
 821         if (len == towrite) {
 822                 inode_unlock(inode);
 823                 return err;
 824         }
 825         if (inode->i_size < off+len-towrite)
 826                 i_size_write(inode, off+len-towrite);
 827         inode->i_mtime = inode->i_ctime = current_time(inode);
 828         mark_inode_dirty(inode);
 829         inode_unlock(inode);
 830         return len - towrite;
 831 }
 832
 833 static struct dquot **jfs_get_dquots(struct inode *inode)
 834 {
 835         return JFS_IP(inode)->i_dquot;
 836 }
 837
 838 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
 839                         const struct path *path)
 840 {
 841         int err;
 842         struct inode *inode;
 843
 844         err = dquot_quota_on(sb, type, format_id, path);
 845         if (err)
 846                 return err;
 847
 848         inode = d_inode(path->dentry);
 849         inode_lock(inode);
 850         JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
 851         inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
 852                         S_NOATIME | S_IMMUTABLE);
 853         inode_unlock(inode);
 854         mark_inode_dirty(inode);
 855
 856         return 0;
 857 }
 858
 859 static int jfs_quota_off(struct super_block *sb, int type)
 860 {
 861         struct inode *inode = sb_dqopt(sb)->files[type];
 862         int err;
 863
 864         if (!inode || !igrab(inode))
 865                 goto out;
 866
 867         err = dquot_quota_off(sb, type);
 868         if (err)
 869                 goto out_put;
 870
 871         inode_lock(inode);
 872         JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
 873         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
 874         inode_unlock(inode);
 875         mark_inode_dirty(inode);
 876 out_put:
 877         iput(inode);
 878         return err;
 879 out:
 880         return dquot_quota_off(sb, type);
 881 }
 882 #endif
 883
 884 static const struct super_operations jfs_super_operations = {
 885         .alloc_inode    = jfs_alloc_inode,
 886         .free_inode     = jfs_free_inode,
 887         .dirty_inode    = jfs_dirty_inode,
 888         .write_inode    = jfs_write_inode,
 889         .evict_inode    = jfs_evict_inode,
 890         .put_super      = jfs_put_super,
 891         .sync_fs        = jfs_sync_fs,
 892         .freeze_fs      = jfs_freeze,
 893         .unfreeze_fs    = jfs_unfreeze,
 894         .statfs         = jfs_statfs,
 895         .remount_fs     = jfs_remount,
 896         .show_options   = jfs_show_options,
 897 #ifdef CONFIG_QUOTA
 898         .quota_read     = jfs_quota_read,
 899         .quota_write    = jfs_quota_write,
 900         .get_dquots     = jfs_get_dquots,
 901 #endif
 902 };
 903
 904 static const struct export_operations jfs_export_operations = {
 905         .fh_to_dentry   = jfs_fh_to_dentry,
 906         .fh_to_parent   = jfs_fh_to_parent,
 907         .get_parent     = jfs_get_parent,
 908 };
 909
 910 static struct file_system_type jfs_fs_type = {
 911         .owner          = THIS_MODULE,
 912         .name           = "jfs",
 913         .mount          = jfs_do_mount,
 914         .kill_sb        = kill_block_super,
 915         .fs_flags       = FS_REQUIRES_DEV,
 916 };
 917 MODULE_ALIAS_FS("jfs");
 918
 919 static void init_once(void *foo)
 920 {
 921         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 922
 923         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 924         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 925         init_rwsem(&jfs_ip->rdwrlock);
 926         mutex_init(&jfs_ip->commit_mutex);
 927         init_rwsem(&jfs_ip->xattr_sem);
 928         spin_lock_init(&jfs_ip->ag_lock);
 929         jfs_ip->active_ag = -1;
 930         inode_init_once(&jfs_ip->vfs_inode);
 931 }
 932
 933 static int __init init_jfs_fs(void)
 934 {
 935         int i;
 936         int rc;
 937
 938         jfs_inode_cachep =
 939             kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
 940                         0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
 941                         offsetof(struct jfs_inode_info, i_inline_all),
 942                         sizeof_field(struct jfs_inode_info, i_inline_all),
 943                         init_once);
 944         if (jfs_inode_cachep == NULL)
 945                 return -ENOMEM;
 946
 947         /*
 948          * Metapage initialization
 949          */
 950         rc = metapage_init();
 951         if (rc) {
 952                 jfs_err("metapage_init failed w/rc = %d", rc);
 953                 goto free_slab;
 954         }
 955
 956         /*
 957          * Transaction Manager initialization
 958          */
 959         rc = txInit();
 960         if (rc) {
 961                 jfs_err("txInit failed w/rc = %d", rc);
 962                 goto free_metapage;
 963         }
 964
 965         /*
 966          * I/O completion thread (endio)
 967          */
 968         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 969         if (IS_ERR(jfsIOthread)) {
 970                 rc = PTR_ERR(jfsIOthread);
 971                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 972                 goto end_txmngr;
 973         }
 974
 975         if (commit_threads < 1)
 976                 commit_threads = num_online_cpus();
 977         if (commit_threads > MAX_COMMIT_THREADS)
 978                 commit_threads = MAX_COMMIT_THREADS;
 979
 980         for (i = 0; i < commit_threads; i++) {
 981                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
 982                                                  "jfsCommit");
 983                 if (IS_ERR(jfsCommitThread[i])) {
 984                         rc = PTR_ERR(jfsCommitThread[i]);
 985                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 986                         commit_threads = i;
 987                         goto kill_committask;
 988                 }
 989         }
 990
 991         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 992         if (IS_ERR(jfsSyncThread)) {
 993                 rc = PTR_ERR(jfsSyncThread);
 994                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 995                 goto kill_committask;
 996         }
 997
 998 #ifdef PROC_FS_JFS
 999         jfs_proc_init();
1000 #endif
1001
1002         rc = register_filesystem(&jfs_fs_type);
1003         if (!rc)
1004                 return 0;
1005
1006 #ifdef PROC_FS_JFS
1007         jfs_proc_clean();
1008 #endif
1009         kthread_stop(jfsSyncThread);
1010 kill_committask:
1011         for (i = 0; i < commit_threads; i++)
1012                 kthread_stop(jfsCommitThread[i]);
1013         kthread_stop(jfsIOthread);
1014 end_txmngr:
1015         txExit();
1016 free_metapage:
1017         metapage_exit();
1018 free_slab:
1019         kmem_cache_destroy(jfs_inode_cachep);
1020         return rc;
1021 }
1022
1023 static void __exit exit_jfs_fs(void)
1024 {
1025         int i;
1026
1027         jfs_info("exit_jfs_fs called");
1028
1029         txExit();
1030         metapage_exit();
1031
1032         kthread_stop(jfsIOthread);
1033         for (i = 0; i < commit_threads; i++)
1034                 kthread_stop(jfsCommitThread[i]);
1035         kthread_stop(jfsSyncThread);
1036 #ifdef PROC_FS_JFS
1037         jfs_proc_clean();
1038 #endif
1039         unregister_filesystem(&jfs_fs_type);
1040
1041         /*
1042          * Make sure all delayed rcu free inodes are flushed before we
1043          * destroy cache.
1044          */
1045         rcu_barrier();
1046         kmem_cache_destroy(jfs_inode_cachep);
1047 }
1048
1049 module_init(init_jfs_fs)
1050 module_exit(exit_jfs_fs)