fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2004
   3  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/fs.h>
  21 #include <linux/module.h>
  22 #include <linux/parser.h>
  23 #include <linux/completion.h>
  24 #include <linux/vfs.h>
  25 #include <linux/mount.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/kthread.h>
  28 #include <linux/posix_acl.h>
  29 #include <linux/buffer_head.h>
  30 #include <asm/uaccess.h>
  31 #include <linux/seq_file.h>
  32
  33 #include "jfs_incore.h"
  34 #include "jfs_filsys.h"
  35 #include "jfs_inode.h"
  36 #include "jfs_metapage.h"
  37 #include "jfs_superblock.h"
  38 #include "jfs_dmap.h"
  39 #include "jfs_imap.h"
  40 #include "jfs_acl.h"
  41 #include "jfs_debug.h"
  42
  43 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  44 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  45 MODULE_LICENSE("GPL");
  46
  47 static struct kmem_cache * jfs_inode_cachep;
  48
  49 static struct super_operations jfs_super_operations;
  50 static struct export_operations jfs_export_operations;
  51 static struct file_system_type jfs_fs_type;
  52
  53 #define MAX_COMMIT_THREADS 64
  54 static int commit_threads = 0;
  55 module_param(commit_threads, int, 0);
  56 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  57
  58 static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS];
  59 struct task_struct *jfsIOthread;
  60 struct task_struct *jfsSyncThread;
  61
  62 #ifdef CONFIG_JFS_DEBUG
  63 int jfsloglevel = JFS_LOGLEVEL_WARN;
  64 module_param(jfsloglevel, int, 0644);
  65 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  66 #endif
  67
  68 static void jfs_handle_error(struct super_block *sb)
  69 {
  70         struct jfs_sb_info *sbi = JFS_SBI(sb);
  71
  72         if (sb->s_flags & MS_RDONLY)
  73                 return;
  74
  75         updateSuper(sb, FM_DIRTY);
  76
  77         if (sbi->flag & JFS_ERR_PANIC)
  78                 panic("JFS (device %s): panic forced after error\n",
  79                         sb->s_id);
  80         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  81                 jfs_err("ERROR: (device %s): remounting filesystem "
  82                         "as read-only\n",
  83                         sb->s_id);
  84                 sb->s_flags |= MS_RDONLY;
  85         }
  86
  87         /* nothing is done for continue beyond marking the superblock dirty */
  88 }
  89
  90 void jfs_error(struct super_block *sb, const char * function, ...)
  91 {
  92         static char error_buf[256];
  93         va_list args;
  94
  95         va_start(args, function);
  96         vsnprintf(error_buf, sizeof(error_buf), function, args);
  97         va_end(args);
  98
  99         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 100
 101         jfs_handle_error(sb);
 102 }
 103
 104 static struct inode *jfs_alloc_inode(struct super_block *sb)
 105 {
 106         struct jfs_inode_info *jfs_inode;
 107
 108         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 109         if (!jfs_inode)
 110                 return NULL;
 111         return &jfs_inode->vfs_inode;
 112 }
 113
 114 static void jfs_destroy_inode(struct inode *inode)
 115 {
 116         struct jfs_inode_info *ji = JFS_IP(inode);
 117
 118         BUG_ON(!list_empty(&ji->anon_inode_list));
 119
 120         spin_lock_irq(&ji->ag_lock);
 121         if (ji->active_ag != -1) {
 122                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 123                 atomic_dec(&bmap->db_active[ji->active_ag]);
 124                 ji->active_ag = -1;
 125         }
 126         spin_unlock_irq(&ji->ag_lock);
 127
 128 #ifdef CONFIG_JFS_POSIX_ACL
 129         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 130                 posix_acl_release(ji->i_acl);
 131                 ji->i_acl = JFS_ACL_NOT_CACHED;
 132         }
 133         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 134                 posix_acl_release(ji->i_default_acl);
 135                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 136         }
 137 #endif
 138
 139         kmem_cache_free(jfs_inode_cachep, ji);
 140 }
 141
 142 static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 143 {
 144         struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb);
 145         s64 maxinodes;
 146         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 147
 148         jfs_info("In jfs_statfs");
 149         buf->f_type = JFS_SUPER_MAGIC;
 150         buf->f_bsize = sbi->bsize;
 151         buf->f_blocks = sbi->bmap->db_mapsize;
 152         buf->f_bfree = sbi->bmap->db_nfree;
 153         buf->f_bavail = sbi->bmap->db_nfree;
 154         /*
 155          * If we really return the number of allocated & free inodes, some
 156          * applications will fail because they won't see enough free inodes.
 157          * We'll try to calculate some guess as to how may inodes we can
 158          * really allocate
 159          *
 160          * buf->f_files = atomic_read(&imap->im_numinos);
 161          * buf->f_ffree = atomic_read(&imap->im_numfree);
 162          */
 163         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 164                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 165                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 166         buf->f_files = maxinodes;
 167         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 168                                     atomic_read(&imap->im_numfree));
 169
 170         buf->f_namelen = JFS_NAME_MAX;
 171         return 0;
 172 }
 173
 174 static void jfs_put_super(struct super_block *sb)
 175 {
 176         struct jfs_sb_info *sbi = JFS_SBI(sb);
 177         int rc;
 178
 179         jfs_info("In jfs_put_super");
 180         rc = jfs_umount(sb);
 181         if (rc)
 182                 jfs_err("jfs_umount failed with return code %d", rc);
 183         if (sbi->nls_tab)
 184                 unload_nls(sbi->nls_tab);
 185         sbi->nls_tab = NULL;
 186
 187         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 188         iput(sbi->direct_inode);
 189         sbi->direct_inode = NULL;
 190
 191         kfree(sbi);
 192 }
 193
 194 enum {
 195         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 196         Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota,
 197         Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask,
 198         Opt_tag, Opt_notag, Opt_tagid
 199 };
 200
 201 static match_table_t tokens = {
 202         {Opt_integrity, "integrity"},
 203         {Opt_nointegrity, "nointegrity"},
 204         {Opt_iocharset, "iocharset=%s"},
 205         {Opt_resize, "resize=%u"},
 206         {Opt_resize_nosize, "resize"},
 207         {Opt_errors, "errors=%s"},
 208         {Opt_tag, "tag"},
 209         {Opt_notag, "notag"},
 210         {Opt_tagid, "tagid=%u"},
 211         {Opt_tag, "tagxid"},
 212         {Opt_ignore, "noquota"},
 213         {Opt_ignore, "quota"},
 214         {Opt_usrquota, "usrquota"},
 215         {Opt_grpquota, "grpquota"},
 216         {Opt_uid, "uid=%u"},
 217         {Opt_gid, "gid=%u"},
 218         {Opt_umask, "umask=%u"},
 219         {Opt_err, NULL}
 220 };
 221
 222 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 223                          int *flag)
 224 {
 225         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 226         char *p;
 227         struct jfs_sb_info *sbi = JFS_SBI(sb);
 228
 229         *newLVSize = 0;
 230
 231         if (!options)
 232                 return 1;
 233
 234         while ((p = strsep(&options, ",")) != NULL) {
 235                 substring_t args[MAX_OPT_ARGS];
 236                 int token;
 237                 if (!*p)
 238                         continue;
 239
 240                 token = match_token(p, tokens, args);
 241                 switch (token) {
 242                 case Opt_integrity:
 243                         *flag &= ~JFS_NOINTEGRITY;
 244                         break;
 245                 case Opt_nointegrity:
 246                         *flag |= JFS_NOINTEGRITY;
 247                         break;
 248                 case Opt_ignore:
 249                         /* Silently ignore the quota options */
 250                         /* Don't do anything ;-) */
 251                         break;
 252                 case Opt_iocharset:
 253                         if (nls_map && nls_map != (void *) -1)
 254                                 unload_nls(nls_map);
 255                         if (!strcmp(args[0].from, "none"))
 256                                 nls_map = NULL;
 257                         else {
 258                                 nls_map = load_nls(args[0].from);
 259                                 if (!nls_map) {
 260                                         printk(KERN_ERR
 261                                                "JFS: charset not found\n");
 262                                         goto cleanup;
 263                                 }
 264                         }
 265                         break;
 266                 case Opt_resize:
 267                 {
 268                         char *resize = args[0].from;
 269                         *newLVSize = simple_strtoull(resize, &resize, 0);
 270                         break;
 271                 }
 272                 case Opt_resize_nosize:
 273                 {
 274                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 275                                 sb->s_blocksize_bits;
 276                         if (*newLVSize == 0)
 277                                 printk(KERN_ERR
 278                                        "JFS: Cannot determine volume size\n");
 279                         break;
 280                 }
 281                 case Opt_errors:
 282                 {
 283                         char *errors = args[0].from;
 284                         if (!errors || !*errors)
 285                                 goto cleanup;
 286                         if (!strcmp(errors, "continue")) {
 287                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 288                                 *flag &= ~JFS_ERR_PANIC;
 289                                 *flag |= JFS_ERR_CONTINUE;
 290                         } else if (!strcmp(errors, "remount-ro")) {
 291                                 *flag &= ~JFS_ERR_CONTINUE;
 292                                 *flag &= ~JFS_ERR_PANIC;
 293                                 *flag |= JFS_ERR_REMOUNT_RO;
 294                         } else if (!strcmp(errors, "panic")) {
 295                                 *flag &= ~JFS_ERR_CONTINUE;
 296                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 297                                 *flag |= JFS_ERR_PANIC;
 298                         } else {
 299                                 printk(KERN_ERR
 300                                        "JFS: %s is an invalid error handler\n",
 301                                        errors);
 302                                 goto cleanup;
 303                         }
 304                         break;
 305                 }
 306
 307 #ifdef CONFIG_QUOTA
 308                 case Opt_quota:
 309                 case Opt_usrquota:
 310                         *flag |= JFS_USRQUOTA;
 311                         break;
 312                 case Opt_grpquota:
 313                         *flag |= JFS_GRPQUOTA;
 314                         break;
 315 #else
 316                 case Opt_usrquota:
 317                 case Opt_grpquota:
 318                 case Opt_quota:
 319                         printk(KERN_ERR
 320                                "JFS: quota operations not supported\n");
 321                         break;
 322 #endif
 323                 case Opt_uid:
 324                 {
 325                         char *uid = args[0].from;
 326                         sbi->uid = simple_strtoul(uid, &uid, 0);
 327                         break;
 328                 }
 329                 case Opt_gid:
 330                 {
 331                         char *gid = args[0].from;
 332                         sbi->gid = simple_strtoul(gid, &gid, 0);
 333                         break;
 334                 }
 335                 case Opt_umask:
 336                 {
 337                         char *umask = args[0].from;
 338                         sbi->umask = simple_strtoul(umask, &umask, 8);
 339                         if (sbi->umask & ~0777) {
 340                                 printk(KERN_ERR
 341                                        "JFS: Invalid value of umask\n");
 342                                 goto cleanup;
 343                         }
 344                         break;
 345                 }
 346 #ifndef CONFIG_TAGGING_NONE
 347                 case Opt_tag:
 348                         *flag |= JFS_TAGGED;
 349                         break;
 350                 case Opt_notag:
 351                         *flag &= JFS_TAGGED;
 352                         break;
 353 #endif
 354 #ifdef CONFIG_PROPAGATE
 355                 case Opt_tagid:
 356                         /* use args[0] */
 357                         *flag |= JFS_TAGGED;
 358                         break;
 359 #endif
 360                 default:
 361                         printk("jfs: Unrecognized mount option \"%s\" "
 362                                         " or missing value\n", p);
 363                         goto cleanup;
 364                 }
 365         }
 366
 367         if (nls_map != (void *) -1) {
 368                 /* Discard old (if remount) */
 369                 if (sbi->nls_tab)
 370                         unload_nls(sbi->nls_tab);
 371                 sbi->nls_tab = nls_map;
 372         }
 373         return 1;
 374
 375 cleanup:
 376         if (nls_map && nls_map != (void *) -1)
 377                 unload_nls(nls_map);
 378         return 0;
 379 }
 380
 381 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 382 {
 383         s64 newLVSize = 0;
 384         int rc = 0;
 385         int flag = JFS_SBI(sb)->flag;
 386
 387         if (!parse_options(data, sb, &newLVSize, &flag)) {
 388                 return -EINVAL;
 389         }
 390
 391         if ((flag & JFS_TAGGED) && !(sb->s_flags & MS_TAGGED)) {
 392                 printk(KERN_ERR "JFS: %s: tagging not permitted on remount.\n",
 393                         sb->s_id);
 394                 return -EINVAL;
 395         }
 396
 397         if (newLVSize) {
 398                 if (sb->s_flags & MS_RDONLY) {
 399                         printk(KERN_ERR
 400                   "JFS: resize requires volume to be mounted read-write\n");
 401                         return -EROFS;
 402                 }
 403                 rc = jfs_extendfs(sb, newLVSize, 0);
 404                 if (rc)
 405                         return rc;
 406         }
 407
 408         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 409                 /*
 410                  * Invalidate any previously read metadata.  fsck may have
 411                  * changed the on-disk data since we mounted r/o
 412                  */
 413                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 414
 415                 JFS_SBI(sb)->flag = flag;
 416                 return jfs_mount_rw(sb, 1);
 417         }
 418         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 419                 rc = jfs_umount_rw(sb);
 420                 JFS_SBI(sb)->flag = flag;
 421                 return rc;
 422         }
 423         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 424                 if (!(sb->s_flags & MS_RDONLY)) {
 425                         rc = jfs_umount_rw(sb);
 426                         if (rc)
 427                                 return rc;
 428                         JFS_SBI(sb)->flag = flag;
 429                         return jfs_mount_rw(sb, 1);
 430                 }
 431         JFS_SBI(sb)->flag = flag;
 432
 433         return 0;
 434 }
 435
 436 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 437 {
 438         struct jfs_sb_info *sbi;
 439         struct inode *inode;
 440         int rc;
 441         s64 newLVSize = 0;
 442         int flag;
 443
 444         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 445
 446         if (!new_valid_dev(sb->s_bdev->bd_dev))
 447                 return -EOVERFLOW;
 448
 449         sbi = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 450         if (!sbi)
 451                 return -ENOMEM;
 452         sb->s_fs_info = sbi;
 453         sbi->sb = sb;
 454         sbi->uid = sbi->gid = sbi->umask = -1;
 455
 456         /* initialize the mount flag and determine the default error handler */
 457         flag = JFS_ERR_REMOUNT_RO;
 458
 459         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 460                 kfree(sbi);
 461                 return -EINVAL;
 462         }
 463         sbi->flag = flag;
 464
 465 #ifdef CONFIG_JFS_POSIX_ACL
 466         sb->s_flags |= MS_POSIXACL;
 467 #endif
 468         /* map mount option tagxid */
 469         if (sbi->flag & JFS_TAGGED)
 470                 sb->s_flags |= MS_TAGGED;
 471
 472         if (newLVSize) {
 473                 printk(KERN_ERR "resize option for remount only\n");
 474                 return -EINVAL;
 475         }
 476
 477         /*
 478          * Initialize blocksize to 4K.
 479          */
 480         sb_set_blocksize(sb, PSIZE);
 481
 482         /*
 483          * Set method vectors.
 484          */
 485         sb->s_op = &jfs_super_operations;
 486         sb->s_export_op = &jfs_export_operations;
 487
 488         /*
 489          * Initialize direct-mapping inode/address-space
 490          */
 491         inode = new_inode(sb);
 492         if (inode == NULL)
 493                 goto out_kfree;
 494         inode->i_ino = 0;
 495         inode->i_nlink = 1;
 496         inode->i_size = sb->s_bdev->bd_inode->i_size;
 497         inode->i_mapping->a_ops = &jfs_metapage_aops;
 498         insert_inode_hash(inode);
 499         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 500
 501         sbi->direct_inode = inode;
 502
 503         rc = jfs_mount(sb);
 504         if (rc) {
 505                 if (!silent) {
 506                         jfs_err("jfs_mount failed w/return code = %d", rc);
 507                 }
 508                 goto out_mount_failed;
 509         }
 510         if (sb->s_flags & MS_RDONLY)
 511                 sbi->log = NULL;
 512         else {
 513                 rc = jfs_mount_rw(sb, 0);
 514                 if (rc) {
 515                         if (!silent) {
 516                                 jfs_err("jfs_mount_rw failed, return code = %d",
 517                                         rc);
 518                         }
 519                         goto out_no_rw;
 520                 }
 521         }
 522
 523         sb->s_magic = JFS_SUPER_MAGIC;
 524
 525         inode = iget(sb, ROOT_I);
 526         if (!inode || is_bad_inode(inode))
 527                 goto out_no_root;
 528         sb->s_root = d_alloc_root(inode);
 529         if (!sb->s_root)
 530                 goto out_no_root;
 531
 532         if (sbi->mntflag & JFS_OS2)
 533                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 534
 535         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 536         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 537 #if BITS_PER_LONG == 32
 538         /*
 539          * Page cache is indexed by long.
 540          * I would use MAX_LFS_FILESIZE, but it's only half as big
 541          */
 542         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 543 #endif
 544         sb->s_time_gran = 1;
 545         return 0;
 546
 547 out_no_root:
 548         jfs_err("jfs_read_super: get root inode failed");
 549         if (inode)
 550                 iput(inode);
 551
 552 out_no_rw:
 553         rc = jfs_umount(sb);
 554         if (rc) {
 555                 jfs_err("jfs_umount failed with return code %d", rc);
 556         }
 557 out_mount_failed:
 558         filemap_write_and_wait(sbi->direct_inode->i_mapping);
 559         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 560         make_bad_inode(sbi->direct_inode);
 561         iput(sbi->direct_inode);
 562         sbi->direct_inode = NULL;
 563 out_kfree:
 564         if (sbi->nls_tab)
 565                 unload_nls(sbi->nls_tab);
 566         kfree(sbi);
 567         return -EINVAL;
 568 }
 569
 570 static void jfs_write_super_lockfs(struct super_block *sb)
 571 {
 572         struct jfs_sb_info *sbi = JFS_SBI(sb);
 573         struct jfs_log *log = sbi->log;
 574
 575         if (!(sb->s_flags & MS_RDONLY)) {
 576                 txQuiesce(sb);
 577                 lmLogShutdown(log);
 578                 updateSuper(sb, FM_CLEAN);
 579         }
 580 }
 581
 582 static void jfs_unlockfs(struct super_block *sb)
 583 {
 584         struct jfs_sb_info *sbi = JFS_SBI(sb);
 585         struct jfs_log *log = sbi->log;
 586         int rc = 0;
 587
 588         if (!(sb->s_flags & MS_RDONLY)) {
 589                 updateSuper(sb, FM_MOUNT);
 590                 if ((rc = lmLogInit(log)))
 591                         jfs_err("jfs_unlock failed with return code %d", rc);
 592                 else
 593                         txResume(sb);
 594         }
 595 }
 596
 597 static int jfs_get_sb(struct file_system_type *fs_type,
 598         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 599 {
 600         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
 601                            mnt);
 602 }
 603
 604 static int jfs_sync_fs(struct super_block *sb, int wait)
 605 {
 606         struct jfs_log *log = JFS_SBI(sb)->log;
 607
 608         /* log == NULL indicates read-only mount */
 609         if (log) {
 610                 jfs_flush_journal(log, wait);
 611                 jfs_syncpt(log, 0);
 612         }
 613
 614         return 0;
 615 }
 616
 617 static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
 618 {
 619         struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb);
 620
 621         if (sbi->uid != -1)
 622                 seq_printf(seq, ",uid=%d", sbi->uid);
 623         if (sbi->gid != -1)
 624                 seq_printf(seq, ",gid=%d", sbi->gid);
 625         if (sbi->umask != -1)
 626                 seq_printf(seq, ",umask=%03o", sbi->umask);
 627         if (sbi->flag & JFS_NOINTEGRITY)
 628                 seq_puts(seq, ",nointegrity");
 629
 630 #ifdef CONFIG_QUOTA
 631         if (sbi->flag & JFS_USRQUOTA)
 632                 seq_puts(seq, ",usrquota");
 633
 634         if (sbi->flag & JFS_GRPQUOTA)
 635                 seq_puts(seq, ",grpquota");
 636 #endif
 637
 638         return 0;
 639 }
 640
 641 #ifdef CONFIG_QUOTA
 642
 643 /* Read data from quotafile - avoid pagecache and such because we cannot afford
 644  * acquiring the locks... As quota files are never truncated and quota code
 645  * itself serializes the operations (and noone else should touch the files)
 646  * we don't have to be afraid of races */
 647 static ssize_t jfs_quota_read(struct super_block *sb, int type, char *data,
 648                               size_t len, loff_t off)
 649 {
 650         struct inode *inode = sb_dqopt(sb)->files[type];
 651         sector_t blk = off >> sb->s_blocksize_bits;
 652         int err = 0;
 653         int offset = off & (sb->s_blocksize - 1);
 654         int tocopy;
 655         size_t toread;
 656         struct buffer_head tmp_bh;
 657         struct buffer_head *bh;
 658         loff_t i_size = i_size_read(inode);
 659
 660         if (off > i_size)
 661                 return 0;
 662         if (off+len > i_size)
 663                 len = i_size-off;
 664         toread = len;
 665         while (toread > 0) {
 666                 tocopy = sb->s_blocksize - offset < toread ?
 667                                 sb->s_blocksize - offset : toread;
 668
 669                 tmp_bh.b_state = 0;
 670                 tmp_bh.b_size = 1 << inode->i_blkbits;
 671                 err = jfs_get_block(inode, blk, &tmp_bh, 0);
 672                 if (err)
 673                         return err;
 674                 if (!buffer_mapped(&tmp_bh))    /* A hole? */
 675                         memset(data, 0, tocopy);
 676                 else {
 677                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 678                         if (!bh)
 679                                 return -EIO;
 680                         memcpy(data, bh->b_data+offset, tocopy);
 681                         brelse(bh);
 682                 }
 683                 offset = 0;
 684                 toread -= tocopy;
 685                 data += tocopy;
 686                 blk++;
 687         }
 688         return len;
 689 }
 690
 691 /* Write to quotafile */
 692 static ssize_t jfs_quota_write(struct super_block *sb, int type,
 693                                const char *data, size_t len, loff_t off)
 694 {
 695         struct inode *inode = sb_dqopt(sb)->files[type];
 696         sector_t blk = off >> sb->s_blocksize_bits;
 697         int err = 0;
 698         int offset = off & (sb->s_blocksize - 1);
 699         int tocopy;
 700         size_t towrite = len;
 701         struct buffer_head tmp_bh;
 702         struct buffer_head *bh;
 703
 704         mutex_lock(&inode->i_mutex);
 705         while (towrite > 0) {
 706                 tocopy = sb->s_blocksize - offset < towrite ?
 707                                 sb->s_blocksize - offset : towrite;
 708
 709                 tmp_bh.b_state = 0;
 710                 tmp_bh.b_size = 1 << inode->i_blkbits;
 711                 err = jfs_get_block(inode, blk, &tmp_bh, 1);
 712                 if (err)
 713                         goto out;
 714                 if (offset || tocopy != sb->s_blocksize)
 715                         bh = sb_bread(sb, tmp_bh.b_blocknr);
 716                 else
 717                         bh = sb_getblk(sb, tmp_bh.b_blocknr);
 718                 if (!bh) {
 719                         err = -EIO;
 720                         goto out;
 721                 }
 722                 lock_buffer(bh);
 723                 memcpy(bh->b_data+offset, data, tocopy);
 724                 flush_dcache_page(bh->b_page);
 725                 set_buffer_uptodate(bh);
 726                 mark_buffer_dirty(bh);
 727                 unlock_buffer(bh);
 728                 brelse(bh);
 729                 offset = 0;
 730                 towrite -= tocopy;
 731                 data += tocopy;
 732                 blk++;
 733         }
 734 out:
 735         if (len == towrite)
 736                 return err;
 737         if (inode->i_size < off+len-towrite)
 738                 i_size_write(inode, off+len-towrite);
 739         inode->i_version++;
 740         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 741         mark_inode_dirty(inode);
 742         mutex_unlock(&inode->i_mutex);
 743         return len - towrite;
 744 }
 745
 746 #endif
 747
 748 static struct super_operations jfs_super_operations = {
 749         .alloc_inode    = jfs_alloc_inode,
 750         .destroy_inode  = jfs_destroy_inode,
 751         .read_inode     = jfs_read_inode,
 752         .dirty_inode    = jfs_dirty_inode,
 753         .write_inode    = jfs_write_inode,
 754         .delete_inode   = jfs_delete_inode,
 755         .put_super      = jfs_put_super,
 756         .sync_fs        = jfs_sync_fs,
 757         .write_super_lockfs = jfs_write_super_lockfs,
 758         .unlockfs       = jfs_unlockfs,
 759         .statfs         = jfs_statfs,
 760         .remount_fs     = jfs_remount,
 761         .show_options   = jfs_show_options,
 762 #ifdef CONFIG_QUOTA
 763         .quota_read     = jfs_quota_read,
 764         .quota_write    = jfs_quota_write,
 765 #endif
 766 };
 767
 768 static struct export_operations jfs_export_operations = {
 769         .get_parent     = jfs_get_parent,
 770 };
 771
 772 static struct file_system_type jfs_fs_type = {
 773         .owner          = THIS_MODULE,
 774         .name           = "jfs",
 775         .get_sb         = jfs_get_sb,
 776         .kill_sb        = kill_block_super,
 777         .fs_flags       = FS_REQUIRES_DEV,
 778 };
 779
 780 static void init_once(void *foo, struct kmem_cache * cachep, unsigned long flags)
 781 {
 782         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 783
 784         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 785             SLAB_CTOR_CONSTRUCTOR) {
 786                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 787                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 788                 init_rwsem(&jfs_ip->rdwrlock);
 789                 mutex_init(&jfs_ip->commit_mutex);
 790                 init_rwsem(&jfs_ip->xattr_sem);
 791                 spin_lock_init(&jfs_ip->ag_lock);
 792                 jfs_ip->active_ag = -1;
 793 #ifdef CONFIG_JFS_POSIX_ACL
 794                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 795                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 796 #endif
 797                 inode_init_once(&jfs_ip->vfs_inode);
 798         }
 799 }
 800
 801 static int __init init_jfs_fs(void)
 802 {
 803         int i;
 804         int rc;
 805
 806         jfs_inode_cachep =
 807             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 808                             SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
 809                             init_once, NULL);
 810         if (jfs_inode_cachep == NULL)
 811                 return -ENOMEM;
 812
 813         /*
 814          * Metapage initialization
 815          */
 816         rc = metapage_init();
 817         if (rc) {
 818                 jfs_err("metapage_init failed w/rc = %d", rc);
 819                 goto free_slab;
 820         }
 821
 822         /*
 823          * Transaction Manager initialization
 824          */
 825         rc = txInit();
 826         if (rc) {
 827                 jfs_err("txInit failed w/rc = %d", rc);
 828                 goto free_metapage;
 829         }
 830
 831         /*
 832          * I/O completion thread (endio)
 833          */
 834         jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO");
 835         if (IS_ERR(jfsIOthread)) {
 836                 rc = PTR_ERR(jfsIOthread);
 837                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 838                 goto end_txmngr;
 839         }
 840
 841         if (commit_threads < 1)
 842                 commit_threads = num_online_cpus();
 843         if (commit_threads > MAX_COMMIT_THREADS)
 844                 commit_threads = MAX_COMMIT_THREADS;
 845
 846         for (i = 0; i < commit_threads; i++) {
 847                 jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, "jfsCommit");
 848                 if (IS_ERR(jfsCommitThread[i])) {
 849                         rc = PTR_ERR(jfsCommitThread[i]);
 850                         jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 851                         commit_threads = i;
 852                         goto kill_committask;
 853                 }
 854         }
 855
 856         jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync");
 857         if (IS_ERR(jfsSyncThread)) {
 858                 rc = PTR_ERR(jfsSyncThread);
 859                 jfs_err("init_jfs_fs: fork failed w/rc = %d", rc);
 860                 goto kill_committask;
 861         }
 862
 863 #ifdef PROC_FS_JFS
 864         jfs_proc_init();
 865 #endif
 866
 867         return register_filesystem(&jfs_fs_type);
 868
 869 kill_committask:
 870         for (i = 0; i < commit_threads; i++)
 871                 kthread_stop(jfsCommitThread[i]);
 872         kthread_stop(jfsIOthread);
 873 end_txmngr:
 874         txExit();
 875 free_metapage:
 876         metapage_exit();
 877 free_slab:
 878         kmem_cache_destroy(jfs_inode_cachep);
 879         return rc;
 880 }
 881
 882 static void __exit exit_jfs_fs(void)
 883 {
 884         int i;
 885
 886         jfs_info("exit_jfs_fs called");
 887
 888         txExit();
 889         metapage_exit();
 890
 891         kthread_stop(jfsIOthread);
 892         for (i = 0; i < commit_threads; i++)
 893                 kthread_stop(jfsCommitThread[i]);
 894         kthread_stop(jfsSyncThread);
 895 #ifdef PROC_FS_JFS
 896         jfs_proc_clean();
 897 #endif
 898         unregister_filesystem(&jfs_fs_type);
 899         kmem_cache_destroy(jfs_inode_cachep);
 900 }
 901
 902 module_init(init_jfs_fs)
 903 module_exit(exit_jfs_fs)