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