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/config.h>
  22 #include <linux/module.h>
  23 #include <linux/parser.h>
  24 #include <linux/completion.h>
  25 #include <linux/vfs.h>
  26 #include <linux/moduleparam.h>
  27 #include <asm/uaccess.h>
  28
  29 #include "jfs_incore.h"
  30 #include "jfs_filsys.h"
  31 #include "jfs_metapage.h"
  32 #include "jfs_superblock.h"
  33 #include "jfs_dmap.h"
  34 #include "jfs_imap.h"
  35 #include "jfs_acl.h"
  36 #include "jfs_debug.h"
  37
  38 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  39 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  40 MODULE_LICENSE("GPL");
  41
  42 static kmem_cache_t * jfs_inode_cachep;
  43
  44 static struct super_operations jfs_super_operations;
  45 static struct export_operations jfs_export_operations;
  46 static struct file_system_type jfs_fs_type;
  47
  48 #define MAX_COMMIT_THREADS 64
  49 static int commit_threads = 0;
  50 module_param(commit_threads, int, 0);
  51 MODULE_PARM_DESC(commit_threads, "Number of commit threads");
  52
  53 int jfs_stop_threads;
  54 static pid_t jfsIOthread;
  55 static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
  56 static pid_t jfsSyncThread;
  57 DECLARE_COMPLETION(jfsIOwait);
  58
  59 #ifdef CONFIG_JFS_DEBUG
  60 int jfsloglevel = JFS_LOGLEVEL_WARN;
  61 module_param(jfsloglevel, int, 0644);
  62 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  63 #endif
  64
  65 /*
  66  * External declarations
  67  */
  68 extern int jfs_mount(struct super_block *);
  69 extern int jfs_mount_rw(struct super_block *, int);
  70 extern int jfs_umount(struct super_block *);
  71 extern int jfs_umount_rw(struct super_block *);
  72
  73 extern int jfsIOWait(void *);
  74 extern int jfs_lazycommit(void *);
  75 extern int jfs_sync(void *);
  76
  77 extern void jfs_read_inode(struct inode *inode);
  78 extern void jfs_dirty_inode(struct inode *inode);
  79 extern void jfs_delete_inode(struct inode *inode);
  80 extern int jfs_write_inode(struct inode *inode, int wait);
  81
  82 extern struct dentry *jfs_get_parent(struct dentry *dentry);
  83 extern int jfs_extendfs(struct super_block *, s64, int);
  84
  85 extern struct dentry_operations jfs_ci_dentry_operations;
  86
  87 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
  88 extern void jfs_proc_init(void);
  89 extern void jfs_proc_clean(void);
  90 #endif
  91
  92 extern wait_queue_head_t jfs_IO_thread_wait;
  93 extern wait_queue_head_t jfs_commit_thread_wait;
  94 extern wait_queue_head_t jfs_sync_thread_wait;
  95
  96 static void jfs_handle_error(struct super_block *sb)
  97 {
  98         struct jfs_sb_info *sbi = JFS_SBI(sb);
  99
 100         if (sb->s_flags & MS_RDONLY)
 101                 return;
 102
 103         updateSuper(sb, FM_DIRTY);
 104
 105         if (sbi->flag & JFS_ERR_PANIC)
 106                 panic("JFS (device %s): panic forced after error\n",
 107                         sb->s_id);
 108         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
 109                 jfs_err("ERROR: (device %s): remounting filesystem "
 110                         "as read-only\n",
 111                         sb->s_id);
 112                 sb->s_flags |= MS_RDONLY;
 113         }
 114
 115         /* nothing is done for continue beyond marking the superblock dirty */
 116 }
 117
 118 void jfs_error(struct super_block *sb, const char * function, ...)
 119 {
 120         static char error_buf[256];
 121         va_list args;
 122
 123         va_start(args, function);
 124         vsprintf(error_buf, function, args);
 125         va_end(args);
 126
 127         printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
 128
 129         jfs_handle_error(sb);
 130 }
 131
 132 static struct inode *jfs_alloc_inode(struct super_block *sb)
 133 {
 134         struct jfs_inode_info *jfs_inode;
 135
 136         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
 137         if (!jfs_inode)
 138                 return NULL;
 139         return &jfs_inode->vfs_inode;
 140 }
 141
 142 static void jfs_destroy_inode(struct inode *inode)
 143 {
 144         struct jfs_inode_info *ji = JFS_IP(inode);
 145
 146         spin_lock_irq(&ji->ag_lock);
 147         if (ji->active_ag != -1) {
 148                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 149                 atomic_dec(&bmap->db_active[ji->active_ag]);
 150                 ji->active_ag = -1;
 151         }
 152         spin_unlock_irq(&ji->ag_lock);
 153
 154 #ifdef CONFIG_JFS_POSIX_ACL
 155         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 156                 posix_acl_release(ji->i_acl);
 157                 ji->i_acl = JFS_ACL_NOT_CACHED;
 158         }
 159         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 160                 posix_acl_release(ji->i_default_acl);
 161                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 162         }
 163 #endif
 164
 165         kmem_cache_free(jfs_inode_cachep, ji);
 166 }
 167
 168 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 169 {
 170         struct jfs_sb_info *sbi = JFS_SBI(sb);
 171         s64 maxinodes;
 172         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 173
 174         jfs_info("In jfs_statfs");
 175         buf->f_type = JFS_SUPER_MAGIC;
 176         buf->f_bsize = sbi->bsize;
 177         buf->f_blocks = sbi->bmap->db_mapsize;
 178         buf->f_bfree = sbi->bmap->db_nfree;
 179         buf->f_bavail = sbi->bmap->db_nfree;
 180         /*
 181          * If we really return the number of allocated & free inodes, some
 182          * applications will fail because they won't see enough free inodes.
 183          * We'll try to calculate some guess as to how may inodes we can
 184          * really allocate
 185          *
 186          * buf->f_files = atomic_read(&imap->im_numinos);
 187          * buf->f_ffree = atomic_read(&imap->im_numfree);
 188          */
 189         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 190                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 191                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 192         buf->f_files = maxinodes;
 193         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 194                                     atomic_read(&imap->im_numfree));
 195
 196         buf->f_namelen = JFS_NAME_MAX;
 197         return 0;
 198 }
 199
 200 static void jfs_put_super(struct super_block *sb)
 201 {
 202         struct jfs_sb_info *sbi = JFS_SBI(sb);
 203         int rc;
 204
 205         jfs_info("In jfs_put_super");
 206         rc = jfs_umount(sb);
 207         if (rc)
 208                 jfs_err("jfs_umount failed with return code %d", rc);
 209         if (sbi->nls_tab)
 210                 unload_nls(sbi->nls_tab);
 211         sbi->nls_tab = NULL;
 212
 213         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 214         iput(sbi->direct_inode);
 215         sbi->direct_inode = NULL;
 216
 217         kfree(sbi);
 218 }
 219
 220 enum {
 221         Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
 222         Opt_resize_nosize, Opt_errors, Opt_tagxid, Opt_ignore, Opt_err,
 223 };
 224
 225 static match_table_t tokens = {
 226         {Opt_integrity, "integrity"},
 227         {Opt_nointegrity, "nointegrity"},
 228         {Opt_iocharset, "iocharset=%s"},
 229         {Opt_resize, "resize=%u"},
 230         {Opt_resize_nosize, "resize"},
 231         {Opt_errors, "errors=%s"},
 232         {Opt_tagxid, "tagxid"},
 233         {Opt_ignore, "noquota"},
 234         {Opt_ignore, "quota"},
 235         {Opt_ignore, "usrquota"},
 236         {Opt_ignore, "grpquota"},
 237         {Opt_err, NULL}
 238 };
 239
 240 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 241                          int *flag)
 242 {
 243         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 244         char *p;
 245         struct jfs_sb_info *sbi = JFS_SBI(sb);
 246
 247         *newLVSize = 0;
 248
 249         if (!options)
 250                 return 1;
 251
 252         while ((p = strsep(&options, ",")) != NULL) {
 253                 substring_t args[MAX_OPT_ARGS];
 254                 int token;
 255                 if (!*p)
 256                         continue;
 257
 258                 token = match_token(p, tokens, args);
 259                 switch (token) {
 260                 case Opt_integrity:
 261                         *flag &= ~JFS_NOINTEGRITY;
 262                         break;
 263                 case Opt_nointegrity:
 264                         *flag |= JFS_NOINTEGRITY;
 265                         break;
 266                 case Opt_ignore:
 267                         /* Silently ignore the quota options */
 268                         /* Don't do anything ;-) */
 269                         break;
 270                 case Opt_iocharset:
 271                         if (nls_map && nls_map != (void *) -1)
 272                                 unload_nls(nls_map);
 273                         if (!strcmp(args[0].from, "none"))
 274                                 nls_map = NULL;
 275                         else {
 276                                 nls_map = load_nls(args[0].from);
 277                                 if (!nls_map) {
 278                                         printk(KERN_ERR
 279                                                "JFS: charset not found\n");
 280                                         goto cleanup;
 281                                 }
 282                         }
 283                         break;
 284                 case Opt_resize:
 285                 {
 286                         char *resize = args[0].from;
 287                         *newLVSize = simple_strtoull(resize, &resize, 0);
 288                         break;
 289                 }
 290                 case Opt_resize_nosize:
 291                 {
 292                         *newLVSize = sb->s_bdev->bd_inode->i_size >>
 293                                 sb->s_blocksize_bits;
 294                         if (*newLVSize == 0)
 295                                 printk(KERN_ERR
 296                                        "JFS: Cannot determine volume size\n");
 297                         break;
 298                 }
 299                 case Opt_errors:
 300                 {
 301                         char *errors = args[0].from;
 302                         if (!errors || !*errors)
 303                                 goto cleanup;
 304                         if (!strcmp(errors, "continue")) {
 305                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 306                                 *flag &= ~JFS_ERR_PANIC;
 307                                 *flag |= JFS_ERR_CONTINUE;
 308                         } else if (!strcmp(errors, "remount-ro")) {
 309                                 *flag &= ~JFS_ERR_CONTINUE;
 310                                 *flag &= ~JFS_ERR_PANIC;
 311                                 *flag |= JFS_ERR_REMOUNT_RO;
 312                         } else if (!strcmp(errors, "panic")) {
 313                                 *flag &= ~JFS_ERR_CONTINUE;
 314                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 315                                 *flag |= JFS_ERR_PANIC;
 316                         } else {
 317                                 printk(KERN_ERR
 318                                        "JFS: %s is an invalid error handler\n",
 319                                        errors);
 320                                 goto cleanup;
 321                         }
 322                         break;
 323                 }
 324                 case Opt_tagxid:
 325                         *flag |= JFS_TAGXID;
 326                         break;
 327                 default:
 328                         printk("jfs: Unrecognized mount option \"%s\" "
 329                                         " or missing value\n", p);
 330                         goto cleanup;
 331                 }
 332         }
 333
 334         if (nls_map != (void *) -1) {
 335                 /* Discard old (if remount) */
 336                 if (sbi->nls_tab)
 337                         unload_nls(sbi->nls_tab);
 338                 sbi->nls_tab = nls_map;
 339         }
 340         return 1;
 341
 342 cleanup:
 343         if (nls_map && nls_map != (void *) -1)
 344                 unload_nls(nls_map);
 345         return 0;
 346 }
 347
 348 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 349 {
 350         s64 newLVSize = 0;
 351         int rc = 0;
 352         int flag = JFS_SBI(sb)->flag;
 353
 354         if (!parse_options(data, sb, &newLVSize, &flag)) {
 355                 return -EINVAL;
 356         }
 357         if (newLVSize) {
 358                 if (sb->s_flags & MS_RDONLY) {
 359                         printk(KERN_ERR
 360                   "JFS: resize requires volume to be mounted read-write\n");
 361                         return -EROFS;
 362                 }
 363                 rc = jfs_extendfs(sb, newLVSize, 0);
 364                 if (rc)
 365                         return rc;
 366         }
 367
 368         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 369                 /*
 370                  * Invalidate any previously read metadata.  fsck may have
 371                  * changed the on-disk data since we mounted r/o
 372                  */
 373                 truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0);
 374
 375                 JFS_SBI(sb)->flag = flag;
 376                 return jfs_mount_rw(sb, 1);
 377         }
 378         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 379                 rc = jfs_umount_rw(sb);
 380                 JFS_SBI(sb)->flag = flag;
 381                 return rc;
 382         }
 383         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 384                 if (!(sb->s_flags & MS_RDONLY)) {
 385                         rc = jfs_umount_rw(sb);
 386                         if (rc)
 387                                 return rc;
 388                         JFS_SBI(sb)->flag = flag;
 389                         return jfs_mount_rw(sb, 1);
 390                 }
 391         JFS_SBI(sb)->flag = flag;
 392
 393         return 0;
 394 }
 395
 396 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 397 {
 398         struct jfs_sb_info *sbi;
 399         struct inode *inode;
 400         int rc;
 401         s64 newLVSize = 0;
 402         int flag;
 403
 404         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 405
 406         if (!new_valid_dev(sb->s_bdev->bd_dev))
 407                 return -EOVERFLOW;
 408
 409         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 410         if (!sbi)
 411                 return -ENOSPC;
 412         memset(sbi, 0, sizeof (struct jfs_sb_info));
 413         sb->s_fs_info = sbi;
 414         sbi->sb = sb;
 415
 416         /* initialize the mount flag and determine the default error handler */
 417         flag = JFS_ERR_REMOUNT_RO;
 418
 419         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 420                 kfree(sbi);
 421                 return -EINVAL;
 422         }
 423         sbi->flag = flag;
 424
 425 #ifdef CONFIG_JFS_POSIX_ACL
 426         sb->s_flags |= MS_POSIXACL;
 427 #endif
 428         /* map mount option tagxid */
 429         if (sbi->flag & JFS_TAGXID)
 430                 sb->s_flags |= MS_TAGXID;
 431
 432         if (newLVSize) {
 433                 printk(KERN_ERR "resize option for remount only\n");
 434                 return -EINVAL;
 435         }
 436
 437         /*
 438          * Initialize blocksize to 4K.
 439          */
 440         sb_set_blocksize(sb, PSIZE);
 441
 442         /*
 443          * Set method vectors.
 444          */
 445         sb->s_op = &jfs_super_operations;
 446         sb->s_export_op = &jfs_export_operations;
 447
 448         /*
 449          * Initialize direct-mapping inode/address-space
 450          */
 451         inode = new_inode(sb);
 452         if (inode == NULL)
 453                 goto out_kfree;
 454         inode->i_ino = 0;
 455         inode->i_nlink = 1;
 456         inode->i_size = sb->s_bdev->bd_inode->i_size;
 457         inode->i_mapping->a_ops = &jfs_metapage_aops;
 458         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
 459
 460         sbi->direct_inode = inode;
 461
 462         rc = jfs_mount(sb);
 463         if (rc) {
 464                 if (!silent) {
 465                         jfs_err("jfs_mount failed w/return code = %d", rc);
 466                 }
 467                 goto out_mount_failed;
 468         }
 469         if (sb->s_flags & MS_RDONLY)
 470                 sbi->log = NULL;
 471         else {
 472                 rc = jfs_mount_rw(sb, 0);
 473                 if (rc) {
 474                         if (!silent) {
 475                                 jfs_err("jfs_mount_rw failed, return code = %d",
 476                                         rc);
 477                         }
 478                         goto out_no_rw;
 479                 }
 480         }
 481
 482         sb->s_magic = JFS_SUPER_MAGIC;
 483
 484         inode = iget(sb, ROOT_I);
 485         if (!inode || is_bad_inode(inode))
 486                 goto out_no_root;
 487         sb->s_root = d_alloc_root(inode);
 488         if (!sb->s_root)
 489                 goto out_no_root;
 490
 491         if (sbi->mntflag & JFS_OS2)
 492                 sb->s_root->d_op = &jfs_ci_dentry_operations;
 493
 494         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 495         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 496 #if BITS_PER_LONG == 32
 497         /*
 498          * Page cache is indexed by long.
 499          * I would use MAX_LFS_FILESIZE, but it's only half as big
 500          */
 501         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 502 #endif
 503         sb->s_time_gran = 1;
 504         return 0;
 505
 506 out_no_root:
 507         jfs_err("jfs_read_super: get root inode failed");
 508         if (inode)
 509                 iput(inode);
 510
 511 out_no_rw:
 512         rc = jfs_umount(sb);
 513         if (rc) {
 514                 jfs_err("jfs_umount failed with return code %d", rc);
 515         }
 516 out_mount_failed:
 517         filemap_fdatawrite(sbi->direct_inode->i_mapping);
 518         filemap_fdatawait(sbi->direct_inode->i_mapping);
 519         truncate_inode_pages(sbi->direct_inode->i_mapping, 0);
 520         make_bad_inode(sbi->direct_inode);
 521         iput(sbi->direct_inode);
 522         sbi->direct_inode = NULL;
 523 out_kfree:
 524         if (sbi->nls_tab)
 525                 unload_nls(sbi->nls_tab);
 526         kfree(sbi);
 527         return -EINVAL;
 528 }
 529
 530 static void jfs_write_super_lockfs(struct super_block *sb)
 531 {
 532         struct jfs_sb_info *sbi = JFS_SBI(sb);
 533         struct jfs_log *log = sbi->log;
 534
 535         if (!(sb->s_flags & MS_RDONLY)) {
 536                 txQuiesce(sb);
 537                 lmLogShutdown(log);
 538                 updateSuper(sb, FM_CLEAN);
 539         }
 540 }
 541
 542 static void jfs_unlockfs(struct super_block *sb)
 543 {
 544         struct jfs_sb_info *sbi = JFS_SBI(sb);
 545         struct jfs_log *log = sbi->log;
 546         int rc = 0;
 547
 548         if (!(sb->s_flags & MS_RDONLY)) {
 549                 updateSuper(sb, FM_MOUNT);
 550                 if ((rc = lmLogInit(log)))
 551                         jfs_err("jfs_unlock failed with return code %d", rc);
 552                 else
 553                         txResume(sb);
 554         }
 555 }
 556
 557 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 558         int flags, const char *dev_name, void *data)
 559 {
 560         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 561 }
 562
 563 static int jfs_sync_fs(struct super_block *sb, int wait)
 564 {
 565         struct jfs_log *log = JFS_SBI(sb)->log;
 566
 567         /* log == NULL indicates read-only mount */
 568         if (log) {
 569                 jfs_flush_journal(log, wait);
 570                 jfs_syncpt(log);
 571         }
 572
 573         return 0;
 574 }
 575
 576 static struct super_operations jfs_super_operations = {
 577         .alloc_inode    = jfs_alloc_inode,
 578         .destroy_inode  = jfs_destroy_inode,
 579         .read_inode     = jfs_read_inode,
 580         .dirty_inode    = jfs_dirty_inode,
 581         .write_inode    = jfs_write_inode,
 582         .delete_inode   = jfs_delete_inode,
 583         .put_super      = jfs_put_super,
 584         .sync_fs        = jfs_sync_fs,
 585         .write_super_lockfs = jfs_write_super_lockfs,
 586         .unlockfs       = jfs_unlockfs,
 587         .statfs         = jfs_statfs,
 588         .remount_fs     = jfs_remount,
 589 };
 590
 591 static struct export_operations jfs_export_operations = {
 592         .get_parent     = jfs_get_parent,
 593 };
 594
 595 static struct file_system_type jfs_fs_type = {
 596         .owner          = THIS_MODULE,
 597         .name           = "jfs",
 598         .get_sb         = jfs_get_sb,
 599         .kill_sb        = kill_block_super,
 600         .fs_flags       = FS_REQUIRES_DEV,
 601 };
 602
 603 extern int metapage_init(void);
 604 extern int txInit(void);
 605 extern void txExit(void);
 606 extern void metapage_exit(void);
 607
 608 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 609 {
 610         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 611
 612         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 613             SLAB_CTOR_CONSTRUCTOR) {
 614                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 615                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 616                 init_rwsem(&jfs_ip->rdwrlock);
 617                 init_MUTEX(&jfs_ip->commit_sem);
 618                 init_rwsem(&jfs_ip->xattr_sem);
 619                 spin_lock_init(&jfs_ip->ag_lock);
 620                 jfs_ip->active_ag = -1;
 621 #ifdef CONFIG_JFS_POSIX_ACL
 622                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 623                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 624 #endif
 625                 inode_init_once(&jfs_ip->vfs_inode);
 626         }
 627 }
 628
 629 static int __init init_jfs_fs(void)
 630 {
 631         int i;
 632         int rc;
 633
 634         jfs_inode_cachep =
 635             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 636                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 637         if (jfs_inode_cachep == NULL)
 638                 return -ENOMEM;
 639
 640         /*
 641          * Metapage initialization
 642          */
 643         rc = metapage_init();
 644         if (rc) {
 645                 jfs_err("metapage_init failed w/rc = %d", rc);
 646                 goto free_slab;
 647         }
 648
 649         /*
 650          * Transaction Manager initialization
 651          */
 652         rc = txInit();
 653         if (rc) {
 654                 jfs_err("txInit failed w/rc = %d", rc);
 655                 goto free_metapage;
 656         }
 657
 658         /*
 659          * I/O completion thread (endio)
 660          */
 661         jfsIOthread = kernel_thread(jfsIOWait, NULL, CLONE_KERNEL);
 662         if (jfsIOthread < 0) {
 663                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 664                 goto end_txmngr;
 665         }
 666         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 667
 668         if (commit_threads < 1)
 669                 commit_threads = num_online_cpus();
 670         if (commit_threads > MAX_COMMIT_THREADS)
 671                 commit_threads = MAX_COMMIT_THREADS;
 672
 673         for (i = 0; i < commit_threads; i++) {
 674                 jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL,
 675                                                    CLONE_KERNEL);
 676                 if (jfsCommitThread[i] < 0) {
 677                         jfs_err("init_jfs_fs: fork failed w/rc = %d",
 678                                 jfsCommitThread[i]);
 679                         commit_threads = i;
 680                         goto kill_committask;
 681                 }
 682                 /* Wait until thread starts */
 683                 wait_for_completion(&jfsIOwait);
 684         }
 685
 686         jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL);
 687         if (jfsSyncThread < 0) {
 688                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 689                 goto kill_committask;
 690         }
 691         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 692
 693 #ifdef PROC_FS_JFS
 694         jfs_proc_init();
 695 #endif
 696
 697         return register_filesystem(&jfs_fs_type);
 698
 699 kill_committask:
 700         jfs_stop_threads = 1;
 701         wake_up_all(&jfs_commit_thread_wait);
 702         for (i = 0; i < commit_threads; i++)
 703                 wait_for_completion(&jfsIOwait);
 704
 705         wake_up(&jfs_IO_thread_wait);
 706         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 707 end_txmngr:
 708         txExit();
 709 free_metapage:
 710         metapage_exit();
 711 free_slab:
 712         kmem_cache_destroy(jfs_inode_cachep);
 713         return rc;
 714 }
 715
 716 static void __exit exit_jfs_fs(void)
 717 {
 718         int i;
 719
 720         jfs_info("exit_jfs_fs called");
 721
 722         jfs_stop_threads = 1;
 723         txExit();
 724         metapage_exit();
 725         wake_up(&jfs_IO_thread_wait);
 726         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 727         wake_up_all(&jfs_commit_thread_wait);
 728         for (i = 0; i < commit_threads; i++)
 729                 wait_for_completion(&jfsIOwait);
 730         wake_up(&jfs_sync_thread_wait);
 731         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 732 #ifdef PROC_FS_JFS
 733         jfs_proc_clean();
 734 #endif
 735         unregister_filesystem(&jfs_fs_type);
 736         kmem_cache_destroy(jfs_inode_cachep);
 737 }
 738
 739 module_init(init_jfs_fs)
 740 module_exit(exit_jfs_fs)