fs/jfs/super.c

   1 /*
   2  *   Copyright (C) International Business Machines Corp., 2000-2005
   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/config.h>
  21 #include <linux/fs.h>
  22 #include <linux/module.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/completion.h>
  25 #include <asm/uaccess.h>
  26 #include "jfs_incore.h"
  27 #include "jfs_filsys.h"
  28 #include "jfs_metapage.h"
  29 #include "jfs_superblock.h"
  30 #include "jfs_dmap.h"
  31 #include "jfs_imap.h"
  32 #include "jfs_debug.h"
  33
  34 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  35 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  36 MODULE_LICENSE("GPL");
  37
  38 static struct super_operations jfs_super_operations;
  39 static struct file_system_type jfs_fs_type;
  40
  41 int jfs_stop_threads;
  42 static pid_t jfsIOthread;
  43 static pid_t jfsCommitThread;
  44 static pid_t jfsSyncThread;
  45 DECLARE_COMPLETION(jfsIOwait);
  46
  47 #ifdef CONFIG_JFS_DEBUG
  48 int jfsloglevel = JFS_LOGLEVEL_WARN;
  49 MODULE_PARM(jfsloglevel, "i");
  50 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  51 #endif
  52
  53 /*
  54  * External declarations
  55  */
  56 extern int jfs_mount(struct super_block *);
  57 extern int jfs_mount_rw(struct super_block *, int);
  58 extern int jfs_umount(struct super_block *);
  59 extern int jfs_umount_rw(struct super_block *);
  60
  61 extern int jfsIOWait(void *);
  62 extern int jfs_lazycommit(void *);
  63 extern int jfs_sync(void *);
  64 extern void jfs_clear_inode(struct inode *inode);
  65 extern void jfs_read_inode(struct inode *inode);
  66 extern void jfs_dirty_inode(struct inode *inode);
  67 extern void jfs_delete_inode(struct inode *inode);
  68 extern void jfs_write_inode(struct inode *inode, int wait);
  69 extern int jfs_extendfs(struct super_block *, s64, int);
  70
  71 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
  72 extern void jfs_proc_init(void);
  73 extern void jfs_proc_clean(void);
  74 #endif
  75
  76 extern wait_queue_head_t jfs_IO_thread_wait;
  77 extern wait_queue_head_t jfs_commit_thread_wait;
  78 extern wait_queue_head_t jfs_sync_thread_wait;
  79
  80 static void jfs_handle_error(struct super_block *sb)
  81 {
  82         struct jfs_sb_info *sbi = JFS_SBI(sb);
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return;
  86
  87         updateSuper(sb, FM_DIRTY);
  88
  89         if (sbi->flag & JFS_ERR_PANIC)
  90                 panic("JFS (device %s): panic forced after error\n",
  91                         bdevname(sb->s_dev));
  92         else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
  93                 jfs_err("ERROR: (device %s): remounting filesystem "
  94                         "as read-only\n",
  95                         bdevname(sb->s_dev));
  96                 sb->s_flags |= MS_RDONLY;
  97         }
  98
  99         /* nothing is done for continue beyond marking the superblock dirty */
 100 }
 101
 102 void jfs_error(struct super_block *sb, const char * function, ...)
 103 {
 104         static char error_buf[256];
 105         va_list args;
 106
 107         va_start(args, function);
 108         vsprintf(error_buf, function, args);
 109         va_end(args);
 110
 111         printk(KERN_ERR "ERROR: (device %s): %s\n", bdevname(sb->s_dev),
 112                error_buf);
 113
 114         jfs_handle_error(sb);
 115 }
 116
 117 static int jfs_statfs(struct super_block *sb, struct statfs *buf)
 118 {
 119         struct jfs_sb_info *sbi = JFS_SBI(sb);
 120         s64 maxinodes;
 121         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 122
 123         jfs_info("In jfs_statfs");
 124         buf->f_type = JFS_SUPER_MAGIC;
 125         buf->f_bsize = sbi->bsize;
 126         buf->f_blocks = sbi->bmap->db_mapsize;
 127         buf->f_bfree = sbi->bmap->db_nfree;
 128         buf->f_bavail = sbi->bmap->db_nfree;
 129         /*
 130          * If we really return the number of allocated & free inodes, some
 131          * applications will fail because they won't see enough free inodes.
 132          * We'll try to calculate some guess as to how may inodes we can
 133          * really allocate
 134          *
 135          * buf->f_files = atomic_read(&imap->im_numinos);
 136          * buf->f_ffree = atomic_read(&imap->im_numfree);
 137          */
 138         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 139                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 140                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 141         buf->f_files = maxinodes;
 142         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 143                                     atomic_read(&imap->im_numfree));
 144
 145         buf->f_namelen = JFS_NAME_MAX;
 146         return 0;
 147 }
 148
 149 static void jfs_put_super(struct super_block *sb)
 150 {
 151         struct jfs_sb_info *sbi = JFS_SBI(sb);
 152         int rc;
 153
 154         jfs_info("In jfs_put_super");
 155         rc = jfs_umount(sb);
 156         if (rc)
 157                 jfs_err("jfs_umount failed with return code %d", rc);
 158         if (sbi->nls_tab) {
 159                 unload_nls(sbi->nls_tab);
 160                 sbi->nls_tab = NULL;
 161         }
 162
 163         kfree(sbi);
 164 }
 165
 166 s64 jfs_get_volume_size(struct super_block *sb)
 167 {
 168         uint blocks = 0;
 169         s64 bytes;
 170         kdev_t dev = sb->s_dev;
 171         int major = MAJOR(dev);
 172         int minor = MINOR(dev);
 173
 174         if (blk_size[major]) {
 175                 blocks = blk_size[major][minor];
 176                 if (blocks) {
 177                         bytes = ((s64)blocks) << BLOCK_SIZE_BITS;
 178                         return bytes >> sb->s_blocksize_bits;
 179                 }
 180         }
 181         return 0;
 182 }
 183
 184 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 185                          int *flag)
 186 {
 187         void *nls_map = (void *)-1;     /* -1: no change;  NULL: none */
 188         char *this_char;
 189         char *value;
 190         struct jfs_sb_info *sbi = JFS_SBI(sb);
 191
 192         *newLVSize = 0;
 193
 194         if (!options)
 195                 return 1;
 196         while ((this_char = strsep(&options, ",")) != NULL) {
 197                 if (!*this_char)
 198                         continue;
 199                 if ((value = strchr(this_char, '=')) != NULL)
 200                         *value++ = 0;
 201                 if (!strcmp(this_char, "errors")) {
 202                         if (!value || !*value)
 203                                 goto needs_arg;
 204                         if (!strcmp(value, "continue")) {
 205                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 206                                 *flag &= ~JFS_ERR_PANIC;
 207                                 *flag |= JFS_ERR_CONTINUE;
 208                         } else if (!strcmp(value, "remount-ro")) {
 209                                 *flag &= ~JFS_ERR_CONTINUE;
 210                                 *flag &= ~JFS_ERR_PANIC;
 211                                 *flag |= JFS_ERR_REMOUNT_RO;
 212                         } else if (!strcmp(value, "panic")) {
 213                                 *flag &= ~JFS_ERR_CONTINUE;
 214                                 *flag &= ~JFS_ERR_REMOUNT_RO;
 215                                 *flag |= JFS_ERR_PANIC;
 216                         } else {
 217                                 printk(KERN_ERR "JFS: %s is an invalid error handler\n", value);
 218                                 goto cleanup;
 219                         }
 220                 } else if (!strcmp(this_char, "integrity")) {
 221                         *flag &= ~JFS_NOINTEGRITY;
 222                 } else  if (!strcmp(this_char, "nointegrity")) {
 223                         *flag |= JFS_NOINTEGRITY;
 224                 } else if (!strcmp(this_char, "iocharset")) {
 225                         if (!value || !*value)
 226                                 goto needs_arg;
 227                         if (nls_map && nls_map != (void *) -1)
 228                                 unload_nls(nls_map);
 229                         if (!strcmp(value, "none"))
 230                                 nls_map = NULL;
 231                         else
 232                                 nls_map = load_nls(value);
 233                 } else if (!strcmp(this_char, "resize")) {
 234                         if (!value || !*value) {
 235                                 *newLVSize = jfs_get_volume_size(sb);
 236                                 if (*newLVSize == 0)
 237                                         printk(KERN_ERR
 238                                          "JFS: Cannot determine volume size\n");
 239                         } else
 240                                 *newLVSize = simple_strtoull(value, &value, 0);
 241
 242                         /* Silently ignore the quota options */
 243                 } else if (!strcmp(this_char, "grpquota")
 244                            || !strcmp(this_char, "noquota")
 245                            || !strcmp(this_char, "quota")
 246                            || !strcmp(this_char, "usrquota"))
 247                         /* Don't do anything ;-) */ ;
 248                 else {
 249                         printk("jfs: Unrecognized mount option %s\n",
 250                                this_char);
 251                         goto cleanup;
 252                 }
 253         }
 254         if (nls_map != (void *) -1) {
 255                 /* Discard old (if remount) */
 256                 if (sbi->nls_tab && sbi->nls_tab != (void *) -1)
 257                         unload_nls(sbi->nls_tab);
 258                 sbi->nls_tab = nls_map;
 259         }
 260         return 1;
 261 needs_arg:
 262         printk(KERN_ERR "JFS: %s needs an argument\n", this_char);
 263 cleanup:
 264         if (nls_map && nls_map != (void *) -1)
 265                 unload_nls(nls_map);
 266         return 0;
 267 }
 268
 269 static int jfs_remount(struct super_block *sb, int *flags, char *data)
 270 {
 271         s64 newLVSize = 0;
 272         int rc = 0;
 273         int flag = JFS_SBI(sb)->flag;
 274
 275         if (!parse_options(data, sb, &newLVSize, &flag)) {
 276                 return -EINVAL;
 277         }
 278         if (newLVSize) {
 279                 if (sb->s_flags & MS_RDONLY) {
 280                         printk(KERN_ERR
 281                   "JFS: resize requires volume to be mounted read-write\n");
 282                         return -EROFS;
 283                 }
 284                 rc = jfs_extendfs(sb, newLVSize, 0);
 285                 if (rc)
 286                         return rc;
 287         }
 288
 289         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 290                 JFS_SBI(sb)->flag = flag;
 291                 return jfs_mount_rw(sb, 1);
 292         }
 293         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 294                 rc = jfs_umount_rw(sb);
 295                 JFS_SBI(sb)->flag = flag;
 296                 return rc;
 297         }
 298         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 299                 if (!(sb->s_flags & MS_RDONLY)) {
 300                         rc = jfs_umount_rw(sb);
 301                         if (rc)
 302                                 return rc;
 303                         JFS_SBI(sb)->flag = flag;
 304                         return jfs_mount_rw(sb, 1);
 305                 }
 306         JFS_SBI(sb)->flag = flag;
 307
 308         return 0;
 309 }
 310
 311 static struct super_block *jfs_read_super(struct super_block *sb,
 312                                           void *data, int silent)
 313 {
 314         struct jfs_sb_info *sbi;
 315         struct inode *inode;
 316         int rc;
 317         s64 newLVSize = 0;
 318         int flag;
 319
 320         jfs_info("In jfs_read_super s_dev=0x%x s_flags=0x%lx", sb->s_dev,
 321                  sb->s_flags);
 322
 323         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 324         if (!sbi)
 325                 return NULL;
 326         memset(sbi, 0, sizeof (struct jfs_sb_info));
 327         sb->u.generic_sbp = sbi;
 328
 329         /* initialize the mount flag and determine the default error handler */
 330         flag = JFS_ERR_REMOUNT_RO;
 331
 332         /* nls_tab will be set to NULL if no character mapping is requested */
 333         sbi->nls_tab = (void *) -1;
 334         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 335                 kfree(sbi);
 336                 return NULL;
 337         }
 338         sbi->flag = flag;
 339
 340         if (newLVSize) {
 341                 printk(KERN_ERR "resize option for remount only\n");
 342                 return NULL;
 343         }
 344
 345         /*
 346          * Initialize blocksize to 4K.
 347          */
 348         sb_set_blocksize(sb, PSIZE);
 349
 350         /*
 351          * Set method vectors.
 352          */
 353         sb->s_op = &jfs_super_operations;
 354
 355         rc = jfs_mount(sb);
 356         if (rc) {
 357                 if (!silent) {
 358                         jfs_err("jfs_mount failed w/return code = %d", rc);
 359                 }
 360                 goto out_kfree;
 361         }
 362         if (sb->s_flags & MS_RDONLY)
 363                 sbi->log = 0;
 364         else {
 365                 rc = jfs_mount_rw(sb, 0);
 366                 if (rc) {
 367                         if (!silent) {
 368                                 jfs_err("jfs_mount_rw failed, return code = %d",
 369                                         rc);
 370                         }
 371                         goto out_no_rw;
 372                 }
 373         }
 374
 375         sb->s_magic = JFS_SUPER_MAGIC;
 376
 377         inode = iget(sb, ROOT_I);
 378         if (!inode || is_bad_inode(inode))
 379                 goto out_no_root;
 380         sb->s_root = d_alloc_root(inode);
 381         if (!sb->s_root)
 382                 goto out_no_root;
 383
 384         if (sbi->nls_tab == (void *) -1)
 385                 sbi->nls_tab = load_nls_default();
 386
 387         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 388         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 389 #if BITS_PER_LONG == 32
 390         /*
 391          * Page cache is indexed by long.
 392          * I would use MAX_LFS_FILESIZE, but it's only half as big
 393          */
 394         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 395 #endif
 396
 397         return sb;
 398
 399 out_no_root:
 400         jfs_err("jfs_read_super: get root inode failed");
 401         if (inode)
 402                 iput(inode);
 403
 404 out_no_rw:
 405         rc = jfs_umount(sb);
 406         if (rc) {
 407                 jfs_err("jfs_umount failed with return code %d", rc);
 408         }
 409 out_kfree:
 410         if (sbi->nls_tab && sbi->nls_tab != (void *) -1)
 411                 unload_nls(sbi->nls_tab);
 412         kfree(sbi);
 413         return NULL;
 414 }
 415
 416 static void jfs_write_super_lockfs(struct super_block *sb)
 417 {
 418         struct jfs_sb_info *sbi = JFS_SBI(sb);
 419         struct jfs_log *log = sbi->log;
 420
 421         if (!(sb->s_flags & MS_RDONLY)) {
 422                 txQuiesce(sb);
 423                 lmLogShutdown(log);
 424                 updateSuper(sb, FM_CLEAN);
 425         }
 426 }
 427
 428 static void jfs_unlockfs(struct super_block *sb)
 429 {
 430         struct jfs_sb_info *sbi = JFS_SBI(sb);
 431         struct jfs_log *log = sbi->log;
 432         int rc = 0;
 433
 434         if (!(sb->s_flags & MS_RDONLY)) {
 435                 updateSuper(sb, FM_MOUNT);
 436                 if ((rc = lmLogInit(log)))
 437                         jfs_err("jfs_unlock failed with return code %d", rc);
 438                 else
 439                         txResume(sb);
 440         }
 441 }
 442
 443
 444 static int jfs_sync_fs(struct super_block *sb)
 445 {
 446         struct jfs_log *log = JFS_SBI(sb)->log;
 447
 448         /* log == NULL indicates read-only mount */
 449         if (log)
 450                 jfs_flush_journal(log, 1);
 451
 452         return 0;
 453 }
 454
 455 static struct super_operations jfs_super_operations = {
 456         .read_inode     = jfs_read_inode,
 457         .dirty_inode    = jfs_dirty_inode,
 458         .write_inode    = jfs_write_inode,
 459         .clear_inode    = jfs_clear_inode,
 460         .delete_inode   = jfs_delete_inode,
 461         .put_super      = jfs_put_super,
 462         .sync_fs        = jfs_sync_fs,
 463         .write_super_lockfs = jfs_write_super_lockfs,
 464         .unlockfs       = jfs_unlockfs,
 465         .statfs         = jfs_statfs,
 466         .remount_fs     = jfs_remount,
 467 };
 468
 469 static struct file_system_type jfs_fs_type = {
 470         .owner          = THIS_MODULE,
 471         .name           = "jfs",
 472         .read_super     = jfs_read_super,
 473         .fs_flags       = FS_REQUIRES_DEV,
 474 };
 475
 476 extern int metapage_init(void);
 477 extern int txInit(void);
 478 extern void txExit(void);
 479 extern void metapage_exit(void);
 480
 481 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 482 {
 483         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 484
 485         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 486             SLAB_CTOR_CONSTRUCTOR) {
 487                 memset(jfs_ip, 0, sizeof(struct jfs_inode_info));
 488                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 489                 init_rwsem(&jfs_ip->rdwrlock);
 490                 init_MUTEX(&jfs_ip->commit_sem);
 491                 spin_lock_init(&jfs_ip->ag_lock);
 492                 jfs_ip->active_ag = -1;
 493         }
 494 }
 495
 496 static int __init init_jfs_fs(void)
 497 {
 498         int rc;
 499
 500         jfs_inode_cachep =
 501             kmem_cache_create("jfs_ip", sizeof (struct jfs_inode_info), 0, 0,
 502                               init_once, NULL);
 503         if (jfs_inode_cachep == NULL)
 504                 return -ENOMEM;
 505
 506         /*
 507          * Metapage initialization
 508          */
 509         rc = metapage_init();
 510         if (rc) {
 511                 jfs_err("metapage_init failed w/rc = %d", rc);
 512                 goto free_slab;
 513         }
 514
 515         /*
 516          * Transaction Manager initialization
 517          */
 518         rc = txInit();
 519         if (rc) {
 520                 jfs_err("txInit failed w/rc = %d", rc);
 521                 goto free_metapage;
 522         }
 523
 524         /*
 525          * I/O completion thread (endio)
 526          */
 527         jfsIOthread = kernel_thread(jfsIOWait, 0,
 528                                     CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 529         if (jfsIOthread < 0) {
 530                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 531                 goto end_txmngr;
 532         }
 533         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 534
 535         jfsCommitThread = kernel_thread(jfs_lazycommit, 0,
 536                                         CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 537         if (jfsCommitThread < 0) {
 538                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsCommitThread);
 539                 goto kill_iotask;
 540         }
 541         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 542
 543         jfsSyncThread = kernel_thread(jfs_sync, 0,
 544                                       CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 545         if (jfsSyncThread < 0) {
 546                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 547                 goto kill_committask;
 548         }
 549         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 550
 551 #ifdef PROC_FS_JFS
 552         jfs_proc_init();
 553 #endif
 554
 555         return register_filesystem(&jfs_fs_type);
 556
 557 kill_committask:
 558         jfs_stop_threads = 1;
 559         wake_up(&jfs_commit_thread_wait);
 560         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 561 kill_iotask:
 562         jfs_stop_threads = 1;
 563         wake_up(&jfs_IO_thread_wait);
 564         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 565 end_txmngr:
 566         txExit();
 567 free_metapage:
 568         metapage_exit();
 569 free_slab:
 570         kmem_cache_destroy(jfs_inode_cachep);
 571         return rc;
 572 }
 573
 574 static void __exit exit_jfs_fs(void)
 575 {
 576         jfs_info("exit_jfs_fs called");
 577
 578         jfs_stop_threads = 1;
 579         txExit();
 580         metapage_exit();
 581         wake_up(&jfs_IO_thread_wait);
 582         wait_for_completion(&jfsIOwait);        /* Wait for IO thread exit */
 583         wake_up(&jfs_commit_thread_wait);
 584         wait_for_completion(&jfsIOwait);        /* Wait for Commit thread exit */
 585         wake_up(&jfs_sync_thread_wait);
 586         wait_for_completion(&jfsIOwait);        /* Wait for Sync thread exit */
 587 #ifdef PROC_FS_JFS
 588         jfs_proc_clean();
 589 #endif
 590         unregister_filesystem(&jfs_fs_type);
 591         kmem_cache_destroy(jfs_inode_cachep);
 592 }
 593
 594 EXPORT_NO_SYMBOLS;
 595
 596 module_init(init_jfs_fs)
 597 module_exit(exit_jfs_fs)