fs/jfs/super.c

   1 /*
   2  *   Copyright (c) International Business Machines Corp., 2000-2003
   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/completion.h>
  24 #include <linux/vfs.h>
  25 #include <asm/uaccess.h>
  26
  27 #include "jfs_incore.h"
  28 #include "jfs_filsys.h"
  29 #include "jfs_metapage.h"
  30 #include "jfs_superblock.h"
  31 #include "jfs_dmap.h"
  32 #include "jfs_imap.h"
  33 #include "jfs_acl.h"
  34 #include "jfs_debug.h"
  35
  36 MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
  37 MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
  38 MODULE_LICENSE("GPL");
  39
  40 static kmem_cache_t * jfs_inode_cachep;
  41
  42 static struct super_operations jfs_super_operations;
  43 static struct export_operations jfs_export_operations;
  44 static struct file_system_type jfs_fs_type;
  45
  46 int jfs_stop_threads;
  47 static pid_t jfsIOthread;
  48 static pid_t jfsCommitThread;
  49 static pid_t jfsSyncThread;
  50 DECLARE_COMPLETION(jfsIOwait);
  51
  52 #ifdef CONFIG_JFS_DEBUG
  53 int jfsloglevel = JFS_LOGLEVEL_WARN;
  54 MODULE_PARM(jfsloglevel, "i");
  55 MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
  56 #endif
  57
  58 /*
  59  * External declarations
  60  */
  61 extern int jfs_mount(struct super_block *);
  62 extern int jfs_mount_rw(struct super_block *, int);
  63 extern int jfs_umount(struct super_block *);
  64 extern int jfs_umount_rw(struct super_block *);
  65
  66 extern int jfsIOWait(void *);
  67 extern int jfs_lazycommit(void *);
  68 extern int jfs_sync(void *);
  69
  70 extern void jfs_read_inode(struct inode *inode);
  71 extern void jfs_dirty_inode(struct inode *inode);
  72 extern void jfs_delete_inode(struct inode *inode);
  73 extern void jfs_write_inode(struct inode *inode, int wait);
  74
  75 extern struct dentry *jfs_get_parent(struct dentry *dentry);
  76 extern int jfs_extendfs(struct super_block *, s64, int);
  77
  78 #ifdef PROC_FS_JFS              /* see jfs_debug.h */
  79 extern void jfs_proc_init(void);
  80 extern void jfs_proc_clean(void);
  81 #endif
  82
  83 extern wait_queue_head_t jfs_IO_thread_wait;
  84 extern wait_queue_head_t jfs_commit_thread_wait;
  85 extern wait_queue_head_t jfs_sync_thread_wait;
  86
  87 static struct inode *jfs_alloc_inode(struct super_block *sb)
  88 {
  89         struct jfs_inode_info *jfs_inode;
  90
  91         jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
  92         if (!jfs_inode)
  93                 return NULL;
  94         return &jfs_inode->vfs_inode;
  95 }
  96
  97 static void jfs_destroy_inode(struct inode *inode)
  98 {
  99         struct jfs_inode_info *ji = JFS_IP(inode);
 100
 101         if (ji->active_ag != -1) {
 102                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 103                 atomic_dec(&bmap->db_active[ji->active_ag]);
 104         }
 105
 106 #ifdef CONFIG_JFS_POSIX_ACL
 107         if (ji->i_acl != JFS_ACL_NOT_CACHED) {
 108                 posix_acl_release(ji->i_acl);
 109                 ji->i_acl = JFS_ACL_NOT_CACHED;
 110         }
 111         if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
 112                 posix_acl_release(ji->i_default_acl);
 113                 ji->i_default_acl = JFS_ACL_NOT_CACHED;
 114         }
 115 #endif
 116
 117         kmem_cache_free(jfs_inode_cachep, ji);
 118 }
 119
 120 static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
 121 {
 122         struct jfs_sb_info *sbi = JFS_SBI(sb);
 123         s64 maxinodes;
 124         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
 125
 126         jfs_info("In jfs_statfs");
 127         buf->f_type = JFS_SUPER_MAGIC;
 128         buf->f_bsize = sbi->bsize;
 129         buf->f_blocks = sbi->bmap->db_mapsize;
 130         buf->f_bfree = sbi->bmap->db_nfree;
 131         buf->f_bavail = sbi->bmap->db_nfree;
 132         /*
 133          * If we really return the number of allocated & free inodes, some
 134          * applications will fail because they won't see enough free inodes.
 135          * We'll try to calculate some guess as to how may inodes we can
 136          * really allocate
 137          *
 138          * buf->f_files = atomic_read(&imap->im_numinos);
 139          * buf->f_ffree = atomic_read(&imap->im_numfree);
 140          */
 141         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 142                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 143                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 144         buf->f_files = maxinodes;
 145         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 146                                     atomic_read(&imap->im_numfree));
 147
 148         buf->f_namelen = JFS_NAME_MAX;
 149         return 0;
 150 }
 151
 152 static void jfs_put_super(struct super_block *sb)
 153 {
 154         struct jfs_sb_info *sbi = JFS_SBI(sb);
 155         int rc;
 156
 157         jfs_info("In jfs_put_super");
 158         rc = jfs_umount(sb);
 159         if (rc)
 160                 jfs_err("jfs_umount failed with return code %d", rc);
 161         unload_nls(sbi->nls_tab);
 162         sbi->nls_tab = NULL;
 163
 164         kfree(sbi);
 165 }
 166
 167 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
 168                          int *flag)
 169 {
 170         void *nls_map = NULL;
 171         char *this_char;
 172         char *value;
 173         struct jfs_sb_info *sbi = JFS_SBI(sb);
 174
 175         *newLVSize = 0;
 176
 177         if (!options)
 178                 return 1;
 179         while ((this_char = strsep(&options, ",")) != NULL) {
 180                 if (!*this_char)
 181                         continue;
 182                 if ((value = strchr(this_char, '=')) != NULL)
 183                         *value++ = 0;
 184                 if (!strcmp(this_char, "integrity")) {
 185                         *flag &= ~JFS_NOINTEGRITY;
 186                 } else  if (!strcmp(this_char, "nointegrity")) {
 187                         *flag |= JFS_NOINTEGRITY;
 188                 } else if (!strcmp(this_char, "iocharset")) {
 189                         if (!value || !*value)
 190                                 goto needs_arg;
 191                         if (nls_map)    /* specified iocharset twice! */
 192                                 unload_nls(nls_map);
 193                         nls_map = load_nls(value);
 194                         if (!nls_map) {
 195                                 printk(KERN_ERR "JFS: charset not found\n");
 196                                 goto cleanup;
 197                         }
 198                 } else if (!strcmp(this_char, "resize")) {
 199                         if (!value || !*value) {
 200                                 *newLVSize = sb->s_bdev->bd_inode->i_size >>
 201                                         sb->s_blocksize_bits;
 202                                 if (*newLVSize == 0)
 203                                         printk(KERN_ERR
 204                                          "JFS: Cannot determine volume size\n");
 205                         } else
 206                                 *newLVSize = simple_strtoull(value, &value, 0);
 207
 208                         /* Silently ignore the quota options */
 209                 } else if (!strcmp(this_char, "grpquota")
 210                            || !strcmp(this_char, "noquota")
 211                            || !strcmp(this_char, "quota")
 212                            || !strcmp(this_char, "usrquota"))
 213                         /* Don't do anything ;-) */ ;
 214                 else {
 215                         printk("jfs: Unrecognized mount option %s\n",
 216                                this_char);
 217                         goto cleanup;
 218                 }
 219         }
 220         if (nls_map) {
 221                 /* Discard old (if remount) */
 222                 if (sbi->nls_tab)
 223                         unload_nls(sbi->nls_tab);
 224                 sbi->nls_tab = nls_map;
 225         }
 226         return 1;
 227 needs_arg:
 228         printk(KERN_ERR "JFS: %s needs an argument\n", this_char);
 229 cleanup:
 230         if (nls_map)
 231                 unload_nls(nls_map);
 232         return 0;
 233 }
 234
 235 int jfs_remount(struct super_block *sb, int *flags, char *data)
 236 {
 237         s64 newLVSize = 0;
 238         int rc = 0;
 239         int flag = JFS_SBI(sb)->flag;
 240
 241         if (!parse_options(data, sb, &newLVSize, &flag)) {
 242                 return -EINVAL;
 243         }
 244         if (newLVSize) {
 245                 if (sb->s_flags & MS_RDONLY) {
 246                         printk(KERN_ERR
 247                   "JFS: resize requires volume to be mounted read-write\n");
 248                         return -EROFS;
 249                 }
 250                 rc = jfs_extendfs(sb, newLVSize, 0);
 251                 if (rc)
 252                         return rc;
 253         }
 254
 255         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
 256                 JFS_SBI(sb)->flag = flag;
 257                 return jfs_mount_rw(sb, 1);
 258         }
 259         if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
 260                 rc = jfs_umount_rw(sb);
 261                 JFS_SBI(sb)->flag = flag;
 262                 return rc;
 263         }
 264         if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
 265                 if (!(sb->s_flags & MS_RDONLY)) {
 266                         rc = jfs_umount_rw(sb);
 267                         if (rc)
 268                                 return rc;
 269                         JFS_SBI(sb)->flag = flag;
 270                         return jfs_mount_rw(sb, 1);
 271                 }
 272         JFS_SBI(sb)->flag = flag;
 273
 274         return 0;
 275 }
 276
 277 static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 278 {
 279         struct jfs_sb_info *sbi;
 280         struct inode *inode;
 281         int rc;
 282         s64 newLVSize = 0;
 283         int flag;
 284
 285         jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 286
 287         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 288         if (!sbi)
 289                 return -ENOSPC;
 290         memset(sbi, 0, sizeof (struct jfs_sb_info));
 291         sb->s_fs_info = sbi;
 292
 293         flag = 0;
 294         if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
 295                 kfree(sbi);
 296                 return -EINVAL;
 297         }
 298         sbi->flag = flag;
 299
 300         if (newLVSize) {
 301                 printk(KERN_ERR "resize option for remount only\n");
 302                 return -EINVAL;
 303         }
 304
 305         /*
 306          * Initialize blocksize to 4K.
 307          */
 308         sb_set_blocksize(sb, PSIZE);
 309
 310         /*
 311          * Set method vectors.
 312          */
 313         sb->s_op = &jfs_super_operations;
 314         sb->s_export_op = &jfs_export_operations;
 315
 316         rc = jfs_mount(sb);
 317         if (rc) {
 318                 if (!silent) {
 319                         jfs_err("jfs_mount failed w/return code = %d", rc);
 320                 }
 321                 goto out_kfree;
 322         }
 323         if (sb->s_flags & MS_RDONLY)
 324                 sbi->log = 0;
 325         else {
 326                 rc = jfs_mount_rw(sb, 0);
 327                 if (rc) {
 328                         if (!silent) {
 329                                 jfs_err("jfs_mount_rw failed, return code = %d",
 330                                         rc);
 331                         }
 332                         goto out_no_rw;
 333                 }
 334         }
 335
 336         sb->s_magic = JFS_SUPER_MAGIC;
 337
 338         inode = iget(sb, ROOT_I);
 339         if (!inode || is_bad_inode(inode))
 340                 goto out_no_root;
 341         sb->s_root = d_alloc_root(inode);
 342         if (!sb->s_root)
 343                 goto out_no_root;
 344
 345         if (!sbi->nls_tab)
 346                 sbi->nls_tab = load_nls_default();
 347
 348         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 349         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 350 #if BITS_PER_LONG == 32
 351         /*
 352          * Page cache is indexed by long.
 353          * I would use MAX_LFS_FILESIZE, but it's only half as big
 354          */
 355         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 356 #endif
 357
 358         return 0;
 359
 360 out_no_root:
 361         jfs_err("jfs_read_super: get root inode failed");
 362         if (inode)
 363                 iput(inode);
 364
 365 out_no_rw:
 366         rc = jfs_umount(sb);
 367         if (rc) {
 368                 jfs_err("jfs_umount failed with return code %d", rc);
 369         }
 370 out_kfree:
 371         if (sbi->nls_tab)
 372                 unload_nls(sbi->nls_tab);
 373         kfree(sbi);
 374         return -EINVAL;
 375 }
 376
 377 static void jfs_write_super_lockfs(struct super_block *sb)
 378 {
 379         struct jfs_sb_info *sbi = JFS_SBI(sb);
 380         struct jfs_log *log = sbi->log;
 381
 382         if (!(sb->s_flags & MS_RDONLY)) {
 383                 txQuiesce(sb);
 384                 lmLogShutdown(log);
 385         }
 386 }
 387
 388 static void jfs_unlockfs(struct super_block *sb)
 389 {
 390         struct jfs_sb_info *sbi = JFS_SBI(sb);
 391         struct jfs_log *log = sbi->log;
 392         int rc = 0;
 393
 394         if (!(sb->s_flags & MS_RDONLY)) {
 395                 if ((rc = lmLogInit(log)))
 396                         jfs_err("jfs_unlock failed with return code %d", rc);
 397                 else
 398                         txResume(sb);
 399         }
 400 }
 401
 402 static struct super_block *jfs_get_sb(struct file_system_type *fs_type,
 403         int flags, const char *dev_name, void *data)
 404 {
 405         return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
 406 }
 407
 408 static int jfs_sync_fs(struct super_block *sb, int wait)
 409 {
 410         struct jfs_log *log = JFS_SBI(sb)->log;
 411
 412         /* log == NULL indicates read-only mount */
 413         if (log)
 414                 jfs_flush_journal(log, wait);
 415
 416         return 0;
 417 }
 418
 419 static struct super_operations jfs_super_operations = {
 420         .alloc_inode    = jfs_alloc_inode,
 421         .destroy_inode  = jfs_destroy_inode,
 422         .read_inode     = jfs_read_inode,
 423         .dirty_inode    = jfs_dirty_inode,
 424         .write_inode    = jfs_write_inode,
 425         .delete_inode   = jfs_delete_inode,
 426         .put_super      = jfs_put_super,
 427         .sync_fs        = jfs_sync_fs,
 428         .write_super_lockfs = jfs_write_super_lockfs,
 429         .unlockfs       = jfs_unlockfs,
 430         .statfs         = jfs_statfs,
 431         .remount_fs     = jfs_remount,
 432 };
 433
 434 static struct export_operations jfs_export_operations = {
 435         .get_parent     = jfs_get_parent,
 436 };
 437
 438 static struct file_system_type jfs_fs_type = {
 439         .owner          = THIS_MODULE,
 440         .name           = "jfs",
 441         .get_sb         = jfs_get_sb,
 442         .kill_sb        = kill_block_super,
 443         .fs_flags       = FS_REQUIRES_DEV,
 444 };
 445
 446 extern int metapage_init(void);
 447 extern int txInit(void);
 448 extern void txExit(void);
 449 extern void metapage_exit(void);
 450
 451 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 452 {
 453         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 454
 455         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 456             SLAB_CTOR_CONSTRUCTOR) {
 457                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 458                 init_rwsem(&jfs_ip->rdwrlock);
 459                 init_MUTEX(&jfs_ip->commit_sem);
 460                 jfs_ip->atlhead = 0;
 461                 jfs_ip->active_ag = -1;
 462 #ifdef CONFIG_JFS_POSIX_ACL
 463                 jfs_ip->i_acl = JFS_ACL_NOT_CACHED;
 464                 jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED;
 465 #endif
 466                 inode_init_once(&jfs_ip->vfs_inode);
 467         }
 468 }
 469
 470 static int __init init_jfs_fs(void)
 471 {
 472         int rc;
 473
 474         jfs_inode_cachep =
 475             kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
 476                             SLAB_RECLAIM_ACCOUNT, init_once, NULL);
 477         if (jfs_inode_cachep == NULL)
 478                 return -ENOMEM;
 479
 480         /*
 481          * Metapage initialization
 482          */
 483         rc = metapage_init();
 484         if (rc) {
 485                 jfs_err("metapage_init failed w/rc = %d", rc);
 486                 goto free_slab;
 487         }
 488
 489         /*
 490          * Transaction Manager initialization
 491          */
 492         rc = txInit();
 493         if (rc) {
 494                 jfs_err("txInit failed w/rc = %d", rc);
 495                 goto free_metapage;
 496         }
 497
 498         /*
 499          * I/O completion thread (endio)
 500          */
 501         jfsIOthread = kernel_thread(jfsIOWait, 0,
 502                                     CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 503         if (jfsIOthread < 0) {
 504                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread);
 505                 goto end_txmngr;
 506         }
 507         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 508
 509         jfsCommitThread = kernel_thread(jfs_lazycommit, 0,
 510                                         CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 511         if (jfsCommitThread < 0) {
 512                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsCommitThread);
 513                 goto kill_iotask;
 514         }
 515         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 516
 517         jfsSyncThread = kernel_thread(jfs_sync, 0,
 518                                       CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 519         if (jfsSyncThread < 0) {
 520                 jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread);
 521                 goto kill_committask;
 522         }
 523         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 524
 525 #ifdef PROC_FS_JFS
 526         jfs_proc_init();
 527 #endif
 528
 529         return register_filesystem(&jfs_fs_type);
 530
 531 kill_committask:
 532         jfs_stop_threads = 1;
 533         wake_up(&jfs_commit_thread_wait);
 534         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 535 kill_iotask:
 536         jfs_stop_threads = 1;
 537         wake_up(&jfs_IO_thread_wait);
 538         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 539 end_txmngr:
 540         txExit();
 541 free_metapage:
 542         metapage_exit();
 543 free_slab:
 544         kmem_cache_destroy(jfs_inode_cachep);
 545         return rc;
 546 }
 547
 548 static void __exit exit_jfs_fs(void)
 549 {
 550         jfs_info("exit_jfs_fs called");
 551
 552         jfs_stop_threads = 1;
 553         txExit();
 554         metapage_exit();
 555         wake_up(&jfs_IO_thread_wait);
 556         wait_for_completion(&jfsIOwait);        /* Wait until IO thread exits */
 557         wake_up(&jfs_commit_thread_wait);
 558         wait_for_completion(&jfsIOwait);        /* Wait until Commit thread exits */
 559         wake_up(&jfs_sync_thread_wait);
 560         wait_for_completion(&jfsIOwait);        /* Wait until Sync thread exits */
 561 #ifdef PROC_FS_JFS
 562         jfs_proc_clean();
 563 #endif
 564         unregister_filesystem(&jfs_fs_type);
 565         kmem_cache_destroy(jfs_inode_cachep);
 566 }
 567
 568 module_init(init_jfs_fs)
 569 module_exit(exit_jfs_fs)