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 = kmem_cache_alloc(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 = i_size_read(sb->s_bdev->bd_inode) >>
 288                                 sb->s_blocksize_bits;
 289                         if (*newLVSize == 0)
 290                                 pr_err("JFS: Cannot determine volume size\n");
 291                         break;
 292                 }
 293                 case Opt_errors:
 294                 {
 295                         char *errors = args[0].from;
 296                         if (!errors || !*errors)
 297                                 goto cleanup;
 298                         if (!strcmp(errors, "continue")) {
 299                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 300                                 *flag &= ~JFS_ERR_PANIC;
 301                                 *flag |= JFS_ERR_CONTINUE;
 302                         } else if (!strcmp(errors, "remount-ro")) {
 303                                 *flag &= ~JFS_ERR_CONTINUE;
 304                                 *flag &= ~JFS_ERR_PANIC;
 305                                 *flag |= JFS_ERR_REMOUNT_RO;
 306                         } else if (!strcmp(errors, "panic")) {
 307                                 *flag &= ~JFS_ERR_CONTINUE;
 308                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 309                                 *flag |= JFS_ERR_PANIC;
 310                         } else {
 311                                 pr_err("JFS: %s is an invalid error handler\n",
 312                                        errors);
 313                                 goto cleanup;
 314                         }
 315                         break;
 316                 }
 317
 318 #ifdef CONFIG_QUOTA
 319                 case Opt_quota:
 320                 case Opt_usrquota:
 321                         *flag |= JFS_USRQUOTA;
 322                         break;
 323                 case Opt_grpquota:
 324                         *flag |= JFS_GRPQUOTA;
 325                         break;
 326 #else
 327                 case Opt_usrquota:
 328                 case Opt_grpquota:
 329                 case Opt_quota:
 330                         pr_err("JFS: quota operations not supported\n");
 331                         break;
 332 #endif
 333                 case Opt_uid:
 334                 {
 335                         char *uid = args[0].from;
 336                         uid_t val;
 337                         int rc = kstrtouint(uid, 0, &val);
 338
 339                         if (rc)
 340                                 goto cleanup;
 341                         sbi->uid = make_kuid(current_user_ns(), val);
 342                         if (!uid_valid(sbi->uid))
 343                                 goto cleanup;
 344                         break;
 345                 }
 346
 347                 case Opt_gid:
 348                 {
 349                         char *gid = args[0].from;
 350                         gid_t val;
 351                         int rc = kstrtouint(gid, 0, &val);
 352
 353                         if (rc)
 354                                 goto cleanup;
 355                         sbi->gid = make_kgid(current_user_ns(), val);
 356                         if (!gid_valid(sbi->gid))
 357                                 goto cleanup;
 358                         break;
 359                 }
 360
 361                 case Opt_umask:
 362                 {
 363                         char *umask = args[0].from;
 364                         int rc = kstrtouint(umask, 8, &sbi->umask);
 365
 366                         if (rc)
 367                                 goto cleanup;
 368                         if (sbi->umask & ~0777) {
 369                                 pr_err("JFS: Invalid value of umask\n");
 370                                 goto cleanup;
 371                         }
 372                         break;
 373                 }
 374
 375                 case Opt_discard:
 376                 {
 377                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 378                         /* if set to 1, even copying files will cause
 379                          * trimming :O
 380                          * -> user has more control over the online trimming
 381                          */
 382                         sbi->minblks_trim = 64;
 383                         if (blk_queue_discard(q))
 384                                 *flag |= JFS_DISCARD;
 385                         else
 386                                 pr_err("JFS: discard option not supported on device\n");
 387                         break;
 388                 }
 389
 390                 case Opt_nodiscard:
 391                         *flag &= ~JFS_DISCARD;
 392                         break;
 393
 394                 case Opt_discard_minblk:
 395                 {
 396                         struct request_queue *q = bdev_get_queue(sb->s_bdev);
 397                         char *minblks_trim = args[0].from;
 398                         int rc;
 399                         if (blk_queue_discard(q)) {
 400                                 *flag |= JFS_DISCARD;
 401                                 rc = kstrtouint(minblks_trim, 0,
 402                                                 &sbi->minblks_trim);
 403                                 if (rc)
 404                                         goto cleanup;
 405                         } else
 406                                 pr_err("JFS: discard option not supported on device\n");
 407                         break;
 408                 }
 409
 410                 default:
 411                         printk("jfs: Unrecognized mount option \"%s\" or missing value\n",
 412                                p);
 413                         goto cleanup;
 414                 }
 415         }
 416
 417         if (nls_map != (void *) -1) {
 418                 /* Discard old (if remount) */
 419                 unload_nls(sbi->nls_tab);
 420                 sbi->nls_tab = nls_map;
 421         }
 422         return 1;
 423
 424 cleanup:
 425         if (nls_map && nls_map != (void *) -1)
 426                 unload_nls(nls_map);
 427         return 0;
 428 }
 429
 430 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 431 {
 432         s64 newLVSize = 0;
 433         int rc = 0;
 434         int flag = JFS_SBI(sb)->flag;
 435         int ret;
 436
 437         sync_filesystem(sb);
 438         if (!parse_options(data, sb, &newLVSize, &flag))
 439                 return -EINVAL;
 440
 441         if (newLVSize) {
 442                 if (sb_rdonly(sb)) {
 443                         pr_err("JFS: resize requires volume to be mounted read-write\n");
 444                         return -EROFS;
 445                 }
 446                 rc = jfs_extendfs(sb, newLVSize, 0);
 447                 if (rc)
 448                         return rc;
 449         }
 450
 451         if (sb_rdonly(sb) && !(*flags & SB_RDONLY)) {
 452                 /*
 453                  * Invalidate any previously read metadata.  fsck may have
 454                  * changed the on-disk data since we mounted r/o
 455                  */
 456                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 457
 458                 JFS_SBI(sb)->flag = flag;
 459                 ret = jfs_mount_rw(sb, 1);
 460
 461                 /* mark the fs r/w for quota activity */
 462                 sb->s_flags &= ~SB_RDONLY;
 463
 464                 dquot_resume(sb, -1);
 465                 return ret;
 466         }
 467         if (!sb_rdonly(sb) && (*flags & SB_RDONLY)) {
 468                 rc = dquot_suspend(sb, -1);
 469                 if (rc < 0)
 470                         return rc;
 471                 rc = jfs_umount_rw(sb);
 472                 JFS_SBI(sb)->flag = flag;
 473                 return rc;
 474         }
 475         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 476                 if (!sb_rdonly(sb)) {
 477                         rc = jfs_umount_rw(sb);
 478                         if (rc)
 479                                 return rc;
 480
 481                         JFS_SBI(sb)->flag = flag;
 482                         ret = jfs_mount_rw(sb, 1);
 483                         return ret;
 484                 }
 485         JFS_SBI(sb)->flag = flag;
 486
 487         return 0;
 488 }
 489
 490 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 491 {
 492         struct jfs_sb_info *sbi;
 493         struct inode *inode;
 494         int rc;
 495         s64 newLVSize = 0;
 496         int flag, ret = -EINVAL;
 497
 498         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 499
 500         sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL);
 501         if (!sbi)
 502                 return -ENOMEM;
 503
 504         sb->s_fs_info = sbi;
 505         sb->s_max_links = JFS_LINK_MAX;
 506         sb->s_time_min = 0;
 507         sb->s_time_max = U32_MAX;
 508         sbi->sb = sb;
 509         sbi->uid = INVALID_UID;
 510         sbi->gid = INVALID_GID;
 511         sbi->umask = -1;
 512
 513         /* initialize the mount flag and determine the default error handler */
 514         flag = JFS_ERR_REMOUNT_RO;
 515
 516         if (!parse_options((char *) data, sb, &newLVSize, &flag))
 517                 goto out_kfree;
 518         sbi->flag = flag;
 519
 520 #ifdef CONFIG_JFS_POSIX_ACL
 521         sb->s_flags |= SB_POSIXACL;
 522 #endif
 523
 524         if (newLVSize) {
 525                 pr_err("resize option for remount only\n");
 526                 goto out_kfree;
 527         }
 528
 529         /*
 530          * Initialize blocksize to 4K.
 531          */
 532         sb_set_blocksize(sb, PSIZE);
 533
 534         /*
 535          * Set method vectors.
 536          */
 537         sb->s_op = &jfs_super_operations;
 538         sb->s_export_op = &jfs_export_operations;
 539         sb->s_xattr = jfs_xattr_handlers;
 540 #ifdef CONFIG_QUOTA
 541         sb->dq_op = &dquot_operations;
 542         sb->s_qcop = &jfs_quotactl_ops;
 543         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 544 #endif
 545
 546         /*
 547          * Initialize direct-mapping inode/address-space
 548          */
 549         inode = new_inode(sb);
 550         if (inode == NULL) {
 551                 ret = -ENOMEM;
 552                 goto out_unload;
 553         }
 554         inode->i_ino = 0;
 555         inode->i_size = i_size_read(sb->s_bdev->bd_inode);
 556         inode->i_mapping->a_ops = &jfs_metapage_aops;
 557         inode_fake_hash(inode);
 558         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 559
 560         sbi->direct_inode = inode;
 561
 562         rc = jfs_mount(sb);
 563         if (rc) {
 564                 if (!silent)
 565                         jfs_err("jfs_mount failed w/return code = %d", rc);
 566                 goto out_mount_failed;
 567         }
 568         if (sb_rdonly(sb))
 569                 sbi->log = NULL;
 570         else {
 571                 rc = jfs_mount_rw(sb, 0);
 572                 if (rc) {
 573                         if (!silent) {
 574                                 jfs_err("jfs_mount_rw failed, return code = %d",
 575                                         rc);
 576                         }
 577                         goto out_no_rw;
 578                 }
 579         }
 580
 581         sb->s_magic = JFS_SUPER_MAGIC;
 582
 583         if (sbi->mntflag & JFS_OS2)
 584                 sb->s_d_op = &jfs_ci_dentry_operations;
 585
 586         inode = jfs_iget(sb, ROOT_I);
 587         if (IS_ERR(inode)) {
 588                 ret = PTR_ERR(inode);
 589                 goto out_no_rw;
 590         }
 591         sb->s_root = d_make_root(inode);
 592         if (!sb->s_root)
 593                 goto out_no_root;
 594
 595         /* logical blocks are represented by 40 bits in pxd_t, etc.
 596          * and page cache is indexed by long
 597          */
 598         sb->s_maxbytes = min(((loff_t)sb->s_blocksize) << 40, MAX_LFS_FILESIZE);
 599         sb->s_time_gran = 1;
 600         return 0;
 601
 602 out_no_root:
 603         jfs_err("jfs_read_super: get root dentry failed");
 604
 605 out_no_rw:
 606         rc = jfs_umount(sb);
 607         if (rc)
 608                 jfs_err("jfs_umount failed with return code %d", rc);
 609 out_mount_failed:
 610         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 611         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 612         make_bad_inode(sbi->direct_inode);
 613         iput(sbi->direct_inode);
 614         sbi->direct_inode = NULL;
 615 out_unload:
 616         unload_nls(sbi->nls_tab);
 617 out_kfree:
 618         kfree(sbi);
 619         return ret;
 620 }
 621
 622 static int jfs_freeze(struct super_block *sb)
 623 {
 624         struct jfs_sb_info *sbi = JFS_SBI(sb);
 625         struct jfs_log *log = sbi->log;
 626         int rc = 0;
 627
 628         if (!sb_rdonly(sb)) {
 629                 txQuiesce(sb);
 630                 rc = lmLogShutdown(log);
 631                 if (rc) {
 632                         jfs_error(sb, "lmLogShutdown failed\n");
 633
 634                         /* let operations fail rather than hang */
 635                         txResume(sb);
 636
 637                         return rc;
 638                 }
 639                 rc = updateSuper(sb, FM_CLEAN);
 640                 if (rc) {
 641                         jfs_err("jfs_freeze: updateSuper failed");
 642                         /*
 643                          * Don't fail here. Everything succeeded except
 644                          * marking the superblock clean, so there's really
 645                          * no harm in leaving it frozen for now.
 646                          */
 647                 }
 648         }
 649         return 0;
 650 }
 651
 652 static int jfs_unfreeze(struct super_block *sb)
 653 {
 654         struct jfs_sb_info *sbi = JFS_SBI(sb);
 655         struct jfs_log *log = sbi->log;
 656         int rc = 0;
 657
 658         if (!sb_rdonly(sb)) {
 659                 rc = updateSuper(sb, FM_MOUNT);
 660                 if (rc) {
 661                         jfs_error(sb, "updateSuper failed\n");
 662                         goto out;
 663                 }
 664                 rc = lmLogInit(log);
 665                 if (rc)
 666                         jfs_error(sb, "lmLogInit failed\n");
 667 out:
 668                 txResume(sb);
 669         }
 670         return rc;
 671 }
 672
 673 static struct dentry *jfs_do_mount(struct file_system_type *fs_type,
 674         int flags, const char *dev_name, void *data)
 675 {
 676         return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 677 }
 678
 679 static int jfs_sync_fs(struct super_block *sb, int wait)
 680 {
 681         struct jfs_log *log = JFS_SBI(sb)->log;
 682
 683         /* log == NULL indicates read-only mount */
 684         if (log) {
 685                 /*
 686                  * Write quota structures to quota file, sync_blockdev() will
 687                  * write them to disk later
 688                  */
 689                 dquot_writeback_dquots(sb, -1);
 690                 jfs_flush_journal(log, wait);
 691                 jfs_syncpt(log, 0);
 692         }
 693
 694         return 0;
 695 }
 696
 697 static int jfs_show_options(struct seq_file *seq, struct dentry *root)
 698 {
 699         struct jfs_sb_info *sbi = JFS_SBI(root->d_sb);
 700
 701         if (uid_valid(sbi->uid))
 702                 seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid));
 703         if (gid_valid(sbi->gid))
 704                 seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid));
 705         if (sbi->umask != -1)
 706                 seq_printf(seq, ",umask=%03o", sbi->umask);
 707         if (sbi->flag & JFS_NOINTEGRITY)
 708                 seq_puts(seq, ",nointegrity");
 709         if (sbi->flag & JFS_DISCARD)
 710                 seq_printf(seq, ",discard=%u", sbi->minblks_trim);
 711         if (sbi->nls_tab)
 712                 seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset);
 713         if (sbi->flag & JFS_ERR_CONTINUE)
 714                 seq_printf(seq, ",errors=continue");
 715         if (sbi->flag & JFS_ERR_PANIC)
 716                 seq_printf(seq, ",errors=panic");
 717
 718 #ifdef CONFIG_QUOTA
 719         if (sbi->flag & JFS_USRQUOTA)
 720                 seq_puts(seq, ",usrquota");
 721
 722         if (sbi->flag & JFS_GRPQUOTA)
 723                 seq_puts(seq, ",grpquota");
 724 #endif
 725
 726         return 0;
 727 }
 728
 729 #ifdef CONFIG_QUOTA
 730
 731 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 732  * acquiring the locks... As quota files are never truncated and quota code
 733  * itself serializes the operations (and no one else should touch the files)
 734  * we don't have to be afraid of races */
 735 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 736                               size_t len, loff_t off)
 737 {
 738         struct inode *inode = sb_dqopt(sb)->files[type];
 739         sector_t blk = off >> sb->s_blocksize_bits;
 740         int err = 0;
 741         int offset = off & (sb->s_blocksize - 1);
 742         int tocopy;
 743         size_t toread;
 744         struct buffer_head tmp_bh;
 745         struct buffer_head *bh;
 746         loff_t i_size = i_size_read(inode);
 747
 748         if (off > i_size)
 749                 return 0;
 750         if (off+len > i_size)
 751                 len = i_size-off;
 752         toread = len;
 753         while (toread > 0) {
 754                 tocopy = sb->s_blocksize - offset < toread ?
 755                                 sb->s_blocksize - offset : toread;
 756
 757                 tmp_bh.b_state = 0;
 758                 tmp_bh.b_size = i_blocksize(inode);
 759                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 760                 if (err)
 761                         return err;
 762                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 763                         memset(data, 0, tocopy);
 764                 else {
 765                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 766                         if (!bh)
 767                                 return -EIO;
 768                         memcpy(data, bh->b_data+offset, tocopy);
 769                         brelse(bh);
 770                 }
 771                 offset = 0;
 772                 toread -= tocopy;
 773                 data += tocopy;
 774                 blk++;
 775         }
 776         return len;
 777 }
 778
 779 /* Write to quotafile */
 780 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 781                                const char *data, size_t len, loff_t off)
 782 {
 783         struct inode *inode = sb_dqopt(sb)->files[type];
 784         sector_t blk = off >> sb->s_blocksize_bits;
 785         int err = 0;
 786         int offset = off & (sb->s_blocksize - 1);
 787         int tocopy;
 788         size_t towrite = len;
 789         struct buffer_head tmp_bh;
 790         struct buffer_head *bh;
 791
 792         inode_lock(inode);
 793         while (towrite > 0) {
 794                 tocopy = sb->s_blocksize - offset < towrite ?
 795                                 sb->s_blocksize - offset : towrite;
 796
 797                 tmp_bh.b_state = 0;
 798                 tmp_bh.b_size = i_blocksize(inode);
 799                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 800                 if (err)
 801                         goto out;
 802                 if (offset || tocopy != sb->s_blocksize)
 803                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 804                 else
 805                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 806                 if (!bh) {
 807                         err = -EIO;
 808                         goto out;
 809                 }
 810                 lock_buffer(bh);
 811                 memcpy(bh->b_data+offset, data, tocopy);
 812                 flush_dcache_page(bh->b_page);
 813                 set_buffer_uptodate(bh);
 814                 mark_buffer_dirty(bh);
 815                 unlock_buffer(bh);
 816                 brelse(bh);
 817                 offset = 0;
 818                 towrite -= tocopy;
 819                 data += tocopy;
 820                 blk++;
 821         }
 822 out:
 823         if (len == towrite) {
 824                 inode_unlock(inode);
 825                 return err;
 826         }
 827         if (inode->i_size < off+len-towrite)
 828                 i_size_write(inode, off+len-towrite);
 829         inode->i_mtime = inode->i_ctime = current_time(inode);
 830         mark_inode_dirty(inode);
 831         inode_unlock(inode);
 832         return len - towrite;
 833 }
 834
 835 static struct dquot **jfs_get_dquots(struct inode *inode)
 836 {
 837         return JFS_IP(inode)->i_dquot;
 838 }
 839
 840 static int jfs_quota_on(struct super_block *sb, int type, int format_id,
 841                         const struct path *path)
 842 {
 843         int err;
 844         struct inode *inode;
 845
 846         err = dquot_quota_on(sb, type, format_id, path);
 847         if (err)
 848                 return err;
 849
 850         inode = d_inode(path->dentry);
 851         inode_lock(inode);
 852         JFS_IP(inode)->mode2 |= JFS_NOATIME_FL | JFS_IMMUTABLE_FL;
 853         inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
 854                         S_NOATIME | S_IMMUTABLE);
 855         inode_unlock(inode);
 856         mark_inode_dirty(inode);
 857
 858         return 0;
 859 }
 860
 861 static int jfs_quota_off(struct super_block *sb, int type)
 862 {
 863         struct inode *inode = sb_dqopt(sb)->files[type];
 864         int err;
 865
 866         if (!inode || !igrab(inode))
 867                 goto out;
 868
 869         err = dquot_quota_off(sb, type);
 870         if (err)
 871                 goto out_put;
 872
 873         inode_lock(inode);
 874         JFS_IP(inode)->mode2 &= ~(JFS_NOATIME_FL | JFS_IMMUTABLE_FL);
 875         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
 876         inode_unlock(inode);
 877         mark_inode_dirty(inode);
 878 out_put:
 879         iput(inode);
 880         return err;
 881 out:
 882         return dquot_quota_off(sb, type);
 883 }
 884 #endif
 885
 886 static const struct super_operations jfs_super_operations = {
 887         .alloc_inode    = jfs_alloc_inode,
 888         .free_inode     = jfs_free_inode,
 889         .dirty_inode    = jfs_dirty_inode,
 890         .write_inode    = jfs_write_inode,
 891         .evict_inode    = jfs_evict_inode,
 892         .put_super      = jfs_put_super,
 893         .sync_fs        = jfs_sync_fs,
 894         .freeze_fs      = jfs_freeze,
 895         .unfreeze_fs    = jfs_unfreeze,
 896         .statfs         = jfs_statfs,
 897         .remount_fs     = jfs_remount,
 898         .show_options   = jfs_show_options,
 899 #ifdef CONFIG_QUOTA
 900         .quota_read     = jfs_quota_read,
 901         .quota_write    = jfs_quota_write,
 902         .get_dquots     = jfs_get_dquots,
 903 #endif
 904 };
 905
 906 static const struct export_operations jfs_export_operations = {
 907         .fh_to_dentry   = jfs_fh_to_dentry,
 908         .fh_to_parent   = jfs_fh_to_parent,
 909         .get_parent     = jfs_get_parent,
 910 };
 911
 912 static struct file_system_type jfs_fs_type = {
 913         .owner          = THIS_MODULE,
 914         .name           = "jfs",
 915         .mount          = jfs_do_mount,
 916         .kill_sb        = kill_block_super,
 917         .fs_flags       = FS_REQUIRES_DEV,
 918 };
 919 MODULE_ALIAS_FS("jfs");
 920
 921 static void init_once(void *foo)
 922 {
 923         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 924
 925         memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 926         INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 927         init_rwsem(&jfs_ip->rdwrlock);
 928         mutex_init(&jfs_ip->commit_mutex);
 929         init_rwsem(&jfs_ip->xattr_sem);
 930         spin_lock_init(&jfs_ip->ag_lock);
 931         jfs_ip->active_ag = -1;
 932         inode_init_once(&jfs_ip->vfs_inode);
 933 }
 934
 935 static int __init init_jfs_fs(void)
 936 {
 937         int i;
 938         int rc;
 939
 940         jfs_inode_cachep =
 941             kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
 942                         0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
 943                         offsetof(struct jfs_inode_info, i_inline), IDATASIZE,
 944                         init_once);
 945         if (jfs_inode_cachep == NULL)
 946                 return -ENOMEM;
 947
 948         /*
 949          * Metapage initialization
 950          */
 951         rc = metapage_init();
 952         if (rc) {
 953                 jfs_err("metapage_init failed w/rc = %d", rc);
 954                 goto free_slab;
 955         }
 956
 957         /*
 958          * Transaction Manager initialization
 959          */
 960         rc = txInit();
 961         if (rc) {
 962                 jfs_err("txInit failed w/rc = %d", rc);
 963                 goto free_metapage;
 964         }
 965
 966         /*
 967          * I/O completion thread (endio)
 968          */
 969         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 970         if (IS_ERR(jfsIOthread)) {
 971                 rc = PTR_ERR(jfsIOthread);
 972                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 973                 goto end_txmngr;
 974         }
 975
 976         if (commit_threads < 1)
 977                 commit_threads = num_online_cpus();
 978         if (commit_threads > MAX_COMMIT_THREADS)
 979                 commit_threads = MAX_COMMIT_THREADS;
 980
 981         for (i = 0; i < commit_threads; i++) {
 982                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL,
 983                                                  "jfsCommit");
 984                 if (IS_ERR(jfsCommitThread[i])) {
 985                         rc = PTR_ERR(jfsCommitThread[i]);
 986                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 987                         commit_threads = i;
 988                         goto kill_committask;
 989                 }
 990         }
 991
 992         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 993         if (IS_ERR(jfsSyncThread)) {
 994                 rc = PTR_ERR(jfsSyncThread);
 995                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 996                 goto kill_committask;
 997         }
 998
 999 #ifdef PROC_FS_JFS
1000         jfs_proc_init();
1001 #endif
1002
1003         rc = register_filesystem(&jfs_fs_type);
1004         if (!rc)
1005                 return 0;
1006
1007 #ifdef PROC_FS_JFS
1008         jfs_proc_clean();
1009 #endif
1010         kthread_stop(jfsSyncThread);
1011 kill_committask:
1012         for (i = 0; i < commit_threads; i++)
1013                 kthread_stop(jfsCommitThread[i]);
1014         kthread_stop(jfsIOthread);
1015 end_txmngr:
1016         txExit();
1017 free_metapage:
1018         metapage_exit();
1019 free_slab:
1020         kmem_cache_destroy(jfs_inode_cachep);
1021         return rc;
1022 }
1023
1024 static void __exit exit_jfs_fs(void)
1025 {
1026         int i;
1027
1028         jfs_info("exit_jfs_fs called");
1029
1030         txExit();
1031         metapage_exit();
1032
1033         kthread_stop(jfsIOthread);
1034         for (i = 0; i < commit_threads; i++)
1035                 kthread_stop(jfsCommitThread[i]);
1036         kthread_stop(jfsSyncThread);
1037 #ifdef PROC_FS_JFS
1038         jfs_proc_clean();
1039 #endif
1040         unregister_filesystem(&jfs_fs_type);
1041
1042         /*
1043          * Make sure all delayed rcu free inodes are flushed before we
1044          * destroy cache.
1045          */
1046         rcu_barrier();
1047         kmem_cache_destroy(jfs_inode_cachep);
1048 }
1049
1050 module_init(init_jfs_fs)
1051 module_exit(exit_jfs_fs)