fs/jfs/super.c

   1 /*
   2  *   Copyright (c) International Business Machines Corp., 2000-2002
   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 = 1;
  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 int jfs_statfs(struct super_block *sb, struct statfs *buf)
  81 {
  82         struct jfs_sb_info *sbi = JFS_SBI(sb);
  83         s64 maxinodes;
  84         struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
  85
  86         jFYI(1, ("In jfs_statfs\n"));
  87         buf->f_type = JFS_SUPER_MAGIC;
  88         buf->f_bsize = sbi->bsize;
  89         buf->f_blocks = sbi->bmap->db_mapsize;
  90         buf->f_bfree = sbi->bmap->db_nfree;
  91         buf->f_bavail = sbi->bmap->db_nfree;
  92         /*
  93          * If we really return the number of allocated & free inodes, some
  94          * applications will fail because they won't see enough free inodes.
  95          * We'll try to calculate some guess as to how may inodes we can
  96          * really allocate
  97          *
  98          * buf->f_files = atomic_read(&imap->im_numinos);
  99          * buf->f_ffree = atomic_read(&imap->im_numfree);
 100          */
 101         maxinodes = min((s64) atomic_read(&imap->im_numinos) +
 102                         ((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
 103                          << L2INOSPEREXT), (s64) 0xffffffffLL);
 104         buf->f_files = maxinodes;
 105         buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
 106                                     atomic_read(&imap->im_numfree));
 107
 108         buf->f_namelen = JFS_NAME_MAX;
 109         return 0;
 110 }
 111
 112 static void jfs_put_super(struct super_block *sb)
 113 {
 114         struct jfs_sb_info *sbi = JFS_SBI(sb);
 115         int rc;
 116
 117         jFYI(1, ("In jfs_put_super\n"));
 118         rc = jfs_umount(sb);
 119         if (rc) {
 120                 jERROR(1, ("jfs_umount failed with return code %d\n", rc));
 121         }
 122         unload_nls(sbi->nls_tab);
 123         sbi->nls_tab = NULL;
 124
 125         kfree(sbi);
 126 }
 127
 128 s64 jfs_get_volume_size(struct super_block *sb)
 129 {
 130         uint blocks = 0;
 131         s64 bytes;
 132         kdev_t dev = sb->s_dev;
 133         int major = MAJOR(dev);
 134         int minor = MINOR(dev);
 135
 136         if (blk_size[major]) {
 137                 blocks = blk_size[major][minor];
 138                 if (blocks) {
 139                         bytes = ((s64)blocks) << BLOCK_SIZE_BITS;
 140                         return bytes >> sb->s_blocksize_bits;
 141                 }
 142         }
 143         return 0;
 144 }
 145
 146 static int parse_options(char *options, struct super_block *sb, s64 *newLVSize)
 147 {
 148         void *nls_map = NULL;
 149         char *this_char;
 150         char *value;
 151         struct jfs_sb_info *sbi = JFS_SBI(sb);
 152
 153         *newLVSize = 0;
 154
 155         if (!options)
 156                 return 1;
 157         while ((this_char = strsep(&options, ",")) != NULL) {
 158                 if (!*this_char)
 159                         continue;
 160                 if ((value = strchr(this_char, '=')) != NULL)
 161                         *value++ = 0;
 162                 if (!strcmp(this_char, "iocharset")) {
 163                         if (!value || !*value)
 164                                 goto needs_arg;
 165                         if (nls_map)    /* specified iocharset twice! */
 166                                 unload_nls(nls_map);
 167                         nls_map = load_nls(value);
 168                         if (!nls_map) {
 169                                 printk(KERN_ERR "JFS: charset not found\n");
 170                                 goto cleanup;
 171                         }
 172                 } else if (!strcmp(this_char, "resize")) {
 173                         if (!value || !*value) {
 174                                 *newLVSize = jfs_get_volume_size(sb);
 175                                 if (*newLVSize == 0)
 176                                         printk(KERN_ERR
 177                                          "JFS: Cannot determine volume size\n");
 178                         } else
 179                                 *newLVSize = simple_strtoull(value, &value, 0);
 180
 181                         /* Silently ignore the quota options */
 182                 } else if (!strcmp(this_char, "grpquota")
 183                            || !strcmp(this_char, "noquota")
 184                            || !strcmp(this_char, "quota")
 185                            || !strcmp(this_char, "usrquota"))
 186                         /* Don't do anything ;-) */ ;
 187                 else {
 188                         printk("jfs: Unrecognized mount option %s\n",
 189                                this_char);
 190                         goto cleanup;
 191                 }
 192         }
 193         if (nls_map) {
 194                 /* Discard old (if remount) */
 195                 if (sbi->nls_tab)
 196                         unload_nls(sbi->nls_tab);
 197                 sbi->nls_tab = nls_map;
 198         }
 199         return 1;
 200 needs_arg:
 201         printk(KERN_ERR "JFS: %s needs an argument\n", this_char);
 202 cleanup:
 203         if (nls_map)
 204                 unload_nls(nls_map);
 205         return 0;
 206 }
 207
 208 int jfs_remount(struct super_block *sb, int *flags, char *data)
 209 {
 210         s64 newLVSize = 0;
 211         int rc = 0;
 212
 213         if (!parse_options(data, sb, &newLVSize)) {
 214                 return -EINVAL;
 215         }
 216         if (newLVSize) {
 217                 if (sb->s_flags & MS_RDONLY) {
 218                         printk(KERN_ERR
 219                   "JFS: resize requires volume to be mounted read-write\n");
 220                         return -EROFS;
 221                 }
 222                 rc = jfs_extendfs(sb, newLVSize, 0);
 223                 if (rc)
 224                         return rc;
 225         }
 226
 227         if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY))
 228                 return jfs_mount_rw(sb, 1);
 229         else if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY))
 230                 return jfs_umount_rw(sb);
 231
 232         return 0;
 233 }
 234
 235 static struct super_block *jfs_read_super(struct super_block *sb,
 236                                           void *data, int silent)
 237 {
 238         struct jfs_sb_info *sbi;
 239         struct inode *inode;
 240         int rc;
 241         s64 newLVSize = 0;
 242
 243         jFYI(1,
 244              ("In jfs_read_super s_dev=0x%x s_flags=0x%lx\n", sb->s_dev,
 245               sb->s_flags));
 246
 247         sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
 248         if (!sbi)
 249                 return NULL;
 250         memset(sbi, 0, sizeof (struct jfs_sb_info));
 251         sb->u.generic_sbp = sbi;
 252
 253         if (!parse_options((char *) data, sb, &newLVSize)) {
 254                 kfree(sbi);
 255                 return NULL;
 256         }
 257
 258         if (newLVSize) {
 259                 printk(KERN_ERR "resize option for remount only\n");
 260                 return NULL;
 261         }
 262
 263         /*
 264          * Initialize blocksize to 4K.
 265          */
 266         sb_set_blocksize(sb, PSIZE);
 267
 268         /*
 269          * Set method vectors.
 270          */
 271         sb->s_op = &jfs_super_operations;
 272
 273         rc = jfs_mount(sb);
 274         if (rc) {
 275                 if (!silent) {
 276                         jERROR(1,
 277                                ("jfs_mount failed w/return code = %d\n", rc));
 278                 }
 279                 goto out_kfree;
 280         }
 281         if (sb->s_flags & MS_RDONLY)
 282                 sbi->log = 0;
 283         else {
 284                 rc = jfs_mount_rw(sb, 0);
 285                 if (rc) {
 286                         if (!silent) {
 287                                 jERROR(1,
 288                                        ("jfs_mount_rw failed w/return code = %d\n",
 289                                         rc));
 290                         }
 291                         goto out_no_rw;
 292                 }
 293         }
 294
 295         sb->s_magic = JFS_SUPER_MAGIC;
 296
 297         inode = iget(sb, ROOT_I);
 298         if (!inode || is_bad_inode(inode))
 299                 goto out_no_root;
 300         sb->s_root = d_alloc_root(inode);
 301         if (!sb->s_root)
 302                 goto out_no_root;
 303
 304         if (!sbi->nls_tab)
 305                 sbi->nls_tab = load_nls_default();
 306
 307         /* logical blocks are represented by 40 bits in pxd_t, etc. */
 308         sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
 309 #if BITS_PER_LONG == 32
 310         /*
 311          * Page cache is indexed by long.
 312          * I would use MAX_LFS_FILESIZE, but it's only half as big
 313          */
 314         sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
 315 #endif
 316
 317         return sb;
 318
 319 out_no_root:
 320         jEVENT(1, ("jfs_read_super: get root inode failed\n"));
 321         if (inode)
 322                 iput(inode);
 323
 324 out_no_rw:
 325         rc = jfs_umount(sb);
 326         if (rc) {
 327                 jERROR(1, ("jfs_umount failed with return code %d\n", rc));
 328         }
 329 out_kfree:
 330         if (sbi->nls_tab)
 331                 unload_nls(sbi->nls_tab);
 332         kfree(sbi);
 333         return NULL;
 334 }
 335
 336 static void jfs_write_super_lockfs(struct super_block *sb)
 337 {
 338         struct jfs_sb_info *sbi = JFS_SBI(sb);
 339         struct jfs_log *log = sbi->log;
 340
 341         if (!(sb->s_flags & MS_RDONLY)) {
 342                 txQuiesce(sb);
 343                 lmLogShutdown(log);
 344         }
 345 }
 346
 347 static void jfs_unlockfs(struct super_block *sb)
 348 {
 349         struct jfs_sb_info *sbi = JFS_SBI(sb);
 350         struct jfs_log *log = sbi->log;
 351         int rc = 0;
 352
 353         if (!(sb->s_flags & MS_RDONLY)) {
 354                 if ((rc = lmLogInit(log)))
 355                         jERROR(1,
 356                                ("jfs_unlock failed with return code %d\n", rc));
 357                 else
 358                         txResume(sb);
 359         }
 360 }
 361
 362
 363 static int jfs_sync_fs(struct super_block *sb)
 364 {
 365         struct jfs_log *log = JFS_SBI(sb)->log;
 366
 367         /* log == NULL indicates read-only mount */
 368         if (log)
 369                 jfs_flush_journal(log, 1);
 370
 371         return 0;
 372 }
 373
 374 static struct super_operations jfs_super_operations = {
 375         .read_inode     = jfs_read_inode,
 376         .dirty_inode    = jfs_dirty_inode,
 377         .write_inode    = jfs_write_inode,
 378         .clear_inode    = jfs_clear_inode,
 379         .delete_inode   = jfs_delete_inode,
 380         .put_super      = jfs_put_super,
 381         .sync_fs        = jfs_sync_fs,
 382         .write_super_lockfs = jfs_write_super_lockfs,
 383         .unlockfs       = jfs_unlockfs,
 384         .statfs         = jfs_statfs,
 385         .remount_fs     = jfs_remount,
 386 };
 387
 388 static struct file_system_type jfs_fs_type = {
 389         .owner          = THIS_MODULE,
 390         .name           = "jfs",
 391         .read_super     = jfs_read_super,
 392         .fs_flags       = FS_REQUIRES_DEV,
 393 };
 394
 395 extern int metapage_init(void);
 396 extern int txInit(void);
 397 extern void txExit(void);
 398 extern void metapage_exit(void);
 399
 400 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
 401 {
 402         struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
 403
 404         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 405             SLAB_CTOR_CONSTRUCTOR) {
 406                 INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
 407                 init_rwsem(&jfs_ip->rdwrlock);
 408                 init_MUTEX(&jfs_ip->commit_sem);
 409                 jfs_ip->atlhead = 0;
 410                 jfs_ip->active_ag = -1;
 411         }
 412 }
 413
 414 static int __init init_jfs_fs(void)
 415 {
 416         int rc;
 417
 418         jfs_inode_cachep =
 419             kmem_cache_create("jfs_ip", sizeof (struct jfs_inode_info), 0, 0,
 420                               init_once, NULL);
 421         if (jfs_inode_cachep == NULL)
 422                 return -ENOMEM;
 423
 424         /*
 425          * Metapage initialization
 426          */
 427         rc = metapage_init();
 428         if (rc) {
 429                 jERROR(1, ("metapage_init failed w/rc = %d\n", rc));
 430                 goto free_slab;
 431         }
 432
 433         /*
 434          * Transaction Manager initialization
 435          */
 436         rc = txInit();
 437         if (rc) {
 438                 jERROR(1, ("txInit failed w/rc = %d\n", rc));
 439                 goto free_metapage;
 440         }
 441
 442         /*
 443          * I/O completion thread (endio)
 444          */
 445         jfsIOthread = kernel_thread(jfsIOWait, 0,
 446                                     CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 447         if (jfsIOthread < 0) {
 448                 jERROR(1,
 449                        ("init_jfs_fs: fork failed w/rc = %d\n", jfsIOthread));
 450                 goto end_txmngr;
 451         }
 452         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 453
 454         jfsCommitThread = kernel_thread(jfs_lazycommit, 0,
 455                                         CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 456         if (jfsCommitThread < 0) {
 457                 jERROR(1,
 458                        ("init_jfs_fs: fork failed w/rc = %d\n",
 459                         jfsCommitThread));
 460                 goto kill_iotask;
 461         }
 462         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 463
 464         jfsSyncThread = kernel_thread(jfs_sync, 0,
 465                                       CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
 466         if (jfsSyncThread < 0) {
 467                 jERROR(1,
 468                        ("init_jfs_fs: fork failed w/rc = %d\n", jfsSyncThread));
 469                 goto kill_committask;
 470         }
 471         wait_for_completion(&jfsIOwait);        /* Wait until thread starts */
 472
 473 #ifdef PROC_FS_JFS
 474         jfs_proc_init();
 475 #endif
 476
 477         return register_filesystem(&jfs_fs_type);
 478
 479 kill_committask:
 480         jfs_stop_threads = 1;
 481         wake_up(&jfs_commit_thread_wait);
 482         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 483 kill_iotask:
 484         jfs_stop_threads = 1;
 485         wake_up(&jfs_IO_thread_wait);
 486         wait_for_completion(&jfsIOwait);        /* Wait for thread exit */
 487 end_txmngr:
 488         txExit();
 489 free_metapage:
 490         metapage_exit();
 491 free_slab:
 492         kmem_cache_destroy(jfs_inode_cachep);
 493         return -rc;
 494 }
 495
 496 static void __exit exit_jfs_fs(void)
 497 {
 498         jFYI(1, ("exit_jfs_fs called\n"));
 499
 500         jfs_stop_threads = 1;
 501         txExit();
 502         metapage_exit();
 503         wake_up(&jfs_IO_thread_wait);
 504         wait_for_completion(&jfsIOwait);        /* Wait for IO thread exit */
 505         wake_up(&jfs_commit_thread_wait);
 506         wait_for_completion(&jfsIOwait);        /* Wait for Commit thread exit */
 507         wake_up(&jfs_sync_thread_wait);
 508         wait_for_completion(&jfsIOwait);        /* Wait for Sync thread exit */
 509 #ifdef PROC_FS_JFS
 510         jfs_proc_clean();
 511 #endif
 512         unregister_filesystem(&jfs_fs_type);
 513         kmem_cache_destroy(jfs_inode_cachep);
 514 }
 515
 516 EXPORT_NO_SYMBOLS;
 517
 518 module_init(init_jfs_fs)
 519 module_exit(exit_jfs_fs)