fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/utsname.h>
  32 #include <linux/init.h>
  33 #include <linux/random.h>
  34 #include <linux/statfs.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/socket.h>
  38 #include <linux/inet.h>
  39 #include <linux/parser.h>
  40 #include <linux/crc32.h>
  41 #include <linux/debugfs.h>
  42
  43 #include <cluster/nodemanager.h>
  44
  45 #define MLOG_MASK_PREFIX ML_SUPER
  46 #include <cluster/masklog.h>
  47
  48 #include "ocfs2.h"
  49
  50 /* this should be the only file to include a version 1 header */
  51 #include "ocfs1_fs_compat.h"
  52
  53 #include "alloc.h"
  54 #include "dlmglue.h"
  55 #include "export.h"
  56 #include "extent_map.h"
  57 #include "heartbeat.h"
  58 #include "inode.h"
  59 #include "journal.h"
  60 #include "localalloc.h"
  61 #include "namei.h"
  62 #include "slot_map.h"
  63 #include "super.h"
  64 #include "sysfile.h"
  65 #include "uptodate.h"
  66 #include "ver.h"
  67 #include "vote.h"
  68
  69 #include "buffer_head_io.h"
  70
  71 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  72
  73 /* OCFS2 needs to schedule several differnt types of work which
  74  * require cluster locking, disk I/O, recovery waits, etc. Since these
  75  * types of work tend to be heavy we avoid using the kernel events
  76  * workqueue and schedule on our own. */
  77 struct workqueue_struct *ocfs2_wq = NULL;
  78
  79 static struct dentry *ocfs2_debugfs_root = NULL;
  80
  81 MODULE_AUTHOR("Oracle");
  82 MODULE_LICENSE("GPL");
  83
  84 static int ocfs2_parse_options(struct super_block *sb, char *options,
  85                                unsigned long *mount_opt, int is_remount);
  86 static void ocfs2_put_super(struct super_block *sb);
  87 static int ocfs2_mount_volume(struct super_block *sb);
  88 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
  89 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
  90 static int ocfs2_initialize_mem_caches(void);
  91 static void ocfs2_free_mem_caches(void);
  92 static void ocfs2_delete_osb(struct ocfs2_super *osb);
  93
  94 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
  95
  96 static int ocfs2_sync_fs(struct super_block *sb, int wait);
  97
  98 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
  99 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 100 static int ocfs2_release_system_inodes(struct ocfs2_super *osb);
 101 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
 102 static int ocfs2_check_volume(struct ocfs2_super *osb);
 103 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 104                                struct buffer_head *bh,
 105                                u32 sectsize);
 106 static int ocfs2_initialize_super(struct super_block *sb,
 107                                   struct buffer_head *bh,
 108                                   int sector_size);
 109 static int ocfs2_get_sector(struct super_block *sb,
 110                             struct buffer_head **bh,
 111                             int block,
 112                             int sect_size);
 113 static void ocfs2_write_super(struct super_block *sb);
 114 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 115 static void ocfs2_destroy_inode(struct inode *inode);
 116
 117 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift);
 118
 119 static struct super_operations ocfs2_sops = {
 120         .statfs         = ocfs2_statfs,
 121         .alloc_inode    = ocfs2_alloc_inode,
 122         .destroy_inode  = ocfs2_destroy_inode,
 123         .drop_inode     = ocfs2_drop_inode,
 124         .clear_inode    = ocfs2_clear_inode,
 125         .delete_inode   = ocfs2_delete_inode,
 126         .sync_fs        = ocfs2_sync_fs,
 127         .write_super    = ocfs2_write_super,
 128         .put_super      = ocfs2_put_super,
 129         .remount_fs     = ocfs2_remount,
 130 };
 131
 132 enum {
 133         Opt_barrier,
 134         Opt_err_panic,
 135         Opt_err_ro,
 136         Opt_intr,
 137         Opt_nointr,
 138         Opt_hb_none,
 139         Opt_hb_local,
 140         Opt_data_ordered,
 141         Opt_data_writeback,
 142         Opt_atime_quantum,
 143         Opt_tag, Opt_notag, Opt_tagid,
 144         Opt_err,
 145 };
 146
 147 static match_table_t tokens = {
 148         {Opt_barrier, "barrier=%u"},
 149         {Opt_err_panic, "errors=panic"},
 150         {Opt_err_ro, "errors=remount-ro"},
 151         {Opt_intr, "intr"},
 152         {Opt_nointr, "nointr"},
 153         {Opt_hb_none, OCFS2_HB_NONE},
 154         {Opt_hb_local, OCFS2_HB_LOCAL},
 155         {Opt_data_ordered, "data=ordered"},
 156         {Opt_data_writeback, "data=writeback"},
 157         {Opt_atime_quantum, "atime_quantum=%u"},
 158         {Opt_tag, "tag"},
 159         {Opt_tag, "tagxid"},
 160         {Opt_notag, "notag"},
 161         {Opt_tagid, "tagid=%u"},
 162         {Opt_err, NULL}
 163 };
 164
 165 /*
 166  * write_super and sync_fs ripped right out of ext3.
 167  */
 168 static void ocfs2_write_super(struct super_block *sb)
 169 {
 170         if (mutex_trylock(&sb->s_lock) != 0)
 171                 BUG();
 172         sb->s_dirt = 0;
 173 }
 174
 175 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 176 {
 177         int status = 0;
 178         tid_t target;
 179         struct ocfs2_super *osb = OCFS2_SB(sb);
 180
 181         sb->s_dirt = 0;
 182
 183         if (ocfs2_is_hard_readonly(osb))
 184                 return -EROFS;
 185
 186         if (wait) {
 187                 status = ocfs2_flush_truncate_log(osb);
 188                 if (status < 0)
 189                         mlog_errno(status);
 190         } else {
 191                 ocfs2_schedule_truncate_log_flush(osb, 0);
 192         }
 193
 194         if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
 195                 if (wait)
 196                         log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 197                                         target);
 198         }
 199         return 0;
 200 }
 201
 202 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 203 {
 204         struct inode *new = NULL;
 205         int status = 0;
 206         int i;
 207
 208         mlog_entry_void();
 209
 210         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
 211         if (IS_ERR(new)) {
 212                 status = PTR_ERR(new);
 213                 mlog_errno(status);
 214                 goto bail;
 215         }
 216         osb->root_inode = new;
 217
 218         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
 219         if (IS_ERR(new)) {
 220                 status = PTR_ERR(new);
 221                 mlog_errno(status);
 222                 goto bail;
 223         }
 224         osb->sys_root_inode = new;
 225
 226         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 227              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 228                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 229                 if (!new) {
 230                         ocfs2_release_system_inodes(osb);
 231                         status = -EINVAL;
 232                         mlog_errno(status);
 233                         /* FIXME: Should ERROR_RO_FS */
 234                         mlog(ML_ERROR, "Unable to load system inode %d, "
 235                              "possibly corrupt fs?", i);
 236                         goto bail;
 237                 }
 238                 // the array now has one ref, so drop this one
 239                 iput(new);
 240         }
 241
 242 bail:
 243         mlog_exit(status);
 244         return status;
 245 }
 246
 247 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 248 {
 249         struct inode *new = NULL;
 250         int status = 0;
 251         int i;
 252
 253         mlog_entry_void();
 254
 255         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 256              i < NUM_SYSTEM_INODES;
 257              i++) {
 258                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 259                 if (!new) {
 260                         ocfs2_release_system_inodes(osb);
 261                         status = -EINVAL;
 262                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 263                              status, i, osb->slot_num);
 264                         goto bail;
 265                 }
 266                 /* the array now has one ref, so drop this one */
 267                 iput(new);
 268         }
 269
 270 bail:
 271         mlog_exit(status);
 272         return status;
 273 }
 274
 275 static int ocfs2_release_system_inodes(struct ocfs2_super *osb)
 276 {
 277         int status = 0, i;
 278         struct inode *inode;
 279
 280         mlog_entry_void();
 281
 282         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 283                 inode = osb->system_inodes[i];
 284                 if (inode) {
 285                         iput(inode);
 286                         osb->system_inodes[i] = NULL;
 287                 }
 288         }
 289
 290         inode = osb->sys_root_inode;
 291         if (inode) {
 292                 iput(inode);
 293                 osb->sys_root_inode = NULL;
 294         }
 295
 296         inode = osb->root_inode;
 297         if (inode) {
 298                 iput(inode);
 299                 osb->root_inode = NULL;
 300         }
 301
 302         mlog_exit(status);
 303         return status;
 304 }
 305
 306 /* We're allocating fs objects, use GFP_NOFS */
 307 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 308 {
 309         struct ocfs2_inode_info *oi;
 310
 311         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 312         if (!oi)
 313                 return NULL;
 314
 315         return &oi->vfs_inode;
 316 }
 317
 318 static void ocfs2_destroy_inode(struct inode *inode)
 319 {
 320         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 321 }
 322
 323 /* From xfs_super.c:xfs_max_file_offset
 324  * Copyright (c) 2000-2004 Silicon Graphics, Inc.
 325  */
 326 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift)
 327 {
 328         unsigned int pagefactor = 1;
 329         unsigned int bitshift = BITS_PER_LONG - 1;
 330
 331         /* Figure out maximum filesize, on Linux this can depend on
 332          * the filesystem blocksize (on 32 bit platforms).
 333          * __block_prepare_write does this in an [unsigned] long...
 334          *      page->index << (PAGE_CACHE_SHIFT - bbits)
 335          * So, for page sized blocks (4K on 32 bit platforms),
 336          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 337          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
 338          * but for smaller blocksizes it is less (bbits = log2 bsize).
 339          * Note1: get_block_t takes a long (implicit cast from above)
 340          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 341          * can optionally convert the [unsigned] long from above into
 342          * an [unsigned] long long.
 343          */
 344
 345 #if BITS_PER_LONG == 32
 346 # if defined(CONFIG_LBD)
 347         BUILD_BUG_ON(sizeof(sector_t) != 8);
 348         pagefactor = PAGE_CACHE_SIZE;
 349         bitshift = BITS_PER_LONG;
 350 # else
 351         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
 352 # endif
 353 #endif
 354
 355         return (((unsigned long long)pagefactor) << bitshift) - 1;
 356 }
 357
 358 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 359 {
 360         int incompat_features;
 361         int ret = 0;
 362         unsigned long parsed_options;
 363         struct ocfs2_super *osb = OCFS2_SB(sb);
 364
 365         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 366                 ret = -EINVAL;
 367                 goto out;
 368         }
 369
 370         printk("ocfs2_remount: %lx,%lx\n", osb->s_mount_opt, sb->s_flags);
 371         if ((parsed_options & OCFS2_MOUNT_TAGGED) &&
 372                 !(sb->s_flags & MS_TAGGED)) {
 373                 ret = -EINVAL;
 374                 mlog(ML_ERROR, "Cannot change tagging on remount\n");
 375                 goto out;
 376         }
 377
 378         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 379             (parsed_options & OCFS2_MOUNT_HB_LOCAL)) {
 380                 ret = -EINVAL;
 381                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 382                 goto out;
 383         }
 384
 385         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 386             (parsed_options & OCFS2_MOUNT_DATA_WRITEBACK)) {
 387                 ret = -EINVAL;
 388                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 389                 goto out;
 390         }
 391
 392         /* We're going to/from readonly mode. */
 393         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 394                 /* Lock here so the check of HARD_RO and the potential
 395                  * setting of SOFT_RO is atomic. */
 396                 spin_lock(&osb->osb_lock);
 397                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 398                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 399                         ret = -EROFS;
 400                         goto unlock_osb;
 401                 }
 402
 403                 if (*flags & MS_RDONLY) {
 404                         mlog(0, "Going to ro mode.\n");
 405                         sb->s_flags |= MS_RDONLY;
 406                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 407                 } else {
 408                         mlog(0, "Making ro filesystem writeable.\n");
 409
 410                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 411                                 mlog(ML_ERROR, "Cannot remount RDWR "
 412                                      "filesystem due to previous errors.\n");
 413                                 ret = -EROFS;
 414                                 goto unlock_osb;
 415                         }
 416                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 417                         if (incompat_features) {
 418                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 419                                      "of unsupported optional features "
 420                                      "(%x).\n", incompat_features);
 421                                 ret = -EINVAL;
 422                                 goto unlock_osb;
 423                         }
 424                         sb->s_flags &= ~MS_RDONLY;
 425                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 426                 }
 427 unlock_osb:
 428                 spin_unlock(&osb->osb_lock);
 429         }
 430
 431         if (!ret) {
 432                 if (!ocfs2_is_hard_readonly(osb))
 433                         ocfs2_set_journal_params(osb);
 434
 435                 /* Only save off the new mount options in case of a successful
 436                  * remount. */
 437                 osb->s_mount_opt = parsed_options;
 438         }
 439 out:
 440         return ret;
 441 }
 442
 443 static int ocfs2_sb_probe(struct super_block *sb,
 444                           struct buffer_head **bh,
 445                           int *sector_size)
 446 {
 447         int status = 0, tmpstat;
 448         struct ocfs1_vol_disk_hdr *hdr;
 449         struct ocfs2_dinode *di;
 450         int blksize;
 451
 452         *bh = NULL;
 453
 454         /* may be > 512 */
 455         *sector_size = bdev_hardsect_size(sb->s_bdev);
 456         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 457                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 458                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 459                 status = -EINVAL;
 460                 goto bail;
 461         }
 462
 463         /* Can this really happen? */
 464         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 465                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 466
 467         /* check block zero for old format */
 468         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 469         if (status < 0) {
 470                 mlog_errno(status);
 471                 goto bail;
 472         }
 473         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 474         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 475                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 476                      hdr->major_version, hdr->minor_version);
 477                 status = -EINVAL;
 478         }
 479         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 480                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 481                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 482                      hdr->signature);
 483                 status = -EINVAL;
 484         }
 485         brelse(*bh);
 486         *bh = NULL;
 487         if (status < 0) {
 488                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 489                      "upgraded before mounting with ocfs v2\n");
 490                 goto bail;
 491         }
 492
 493         /*
 494          * Now check at magic offset for 512, 1024, 2048, 4096
 495          * blocksizes.  4096 is the maximum blocksize because it is
 496          * the minimum clustersize.
 497          */
 498         status = -EINVAL;
 499         for (blksize = *sector_size;
 500              blksize <= OCFS2_MAX_BLOCKSIZE;
 501              blksize <<= 1) {
 502                 tmpstat = ocfs2_get_sector(sb, bh,
 503                                            OCFS2_SUPER_BLOCK_BLKNO,
 504                                            blksize);
 505                 if (tmpstat < 0) {
 506                         status = tmpstat;
 507                         mlog_errno(status);
 508                         goto bail;
 509                 }
 510                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 511                 status = ocfs2_verify_volume(di, *bh, blksize);
 512                 if (status >= 0)
 513                         goto bail;
 514                 brelse(*bh);
 515                 *bh = NULL;
 516                 if (status != -EAGAIN)
 517                         break;
 518         }
 519
 520 bail:
 521         return status;
 522 }
 523
 524 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 525 {
 526         if (ocfs2_mount_local(osb)) {
 527                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 528                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 529                              "mounted device.\n");
 530                         return -EINVAL;
 531                 }
 532         }
 533
 534         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 535                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
 536                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 537                              "a read-write clustered device.\n");
 538                         return -EINVAL;
 539                 }
 540         }
 541
 542         return 0;
 543 }
 544
 545 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 546 {
 547         struct dentry *root;
 548         int status, sector_size;
 549         unsigned long parsed_opt;
 550         struct inode *inode = NULL;
 551         struct ocfs2_super *osb = NULL;
 552         struct buffer_head *bh = NULL;
 553         char nodestr[8];
 554
 555         mlog_entry("%p, %p, %i", sb, data, silent);
 556
 557         if (!ocfs2_parse_options(sb, data, &parsed_opt, 0)) {
 558                 status = -EINVAL;
 559                 goto read_super_error;
 560         }
 561
 562         /* for now we only have one cluster/node, make sure we see it
 563          * in the heartbeat universe */
 564         if (parsed_opt & OCFS2_MOUNT_HB_LOCAL) {
 565                 if (!o2hb_check_local_node_heartbeating()) {
 566                         status = -EINVAL;
 567                         goto read_super_error;
 568                 }
 569         }
 570
 571         /* probe for superblock */
 572         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 573         if (status < 0) {
 574                 mlog(ML_ERROR, "superblock probe failed!\n");
 575                 goto read_super_error;
 576         }
 577
 578         status = ocfs2_initialize_super(sb, bh, sector_size);
 579         osb = OCFS2_SB(sb);
 580         if (status < 0) {
 581                 mlog_errno(status);
 582                 goto read_super_error;
 583         }
 584         brelse(bh);
 585         bh = NULL;
 586         osb->s_mount_opt = parsed_opt;
 587
 588         sb->s_magic = OCFS2_SUPER_MAGIC;
 589
 590         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 591          * heartbeat=none */
 592         if (bdev_read_only(sb->s_bdev)) {
 593                 if (!(sb->s_flags & MS_RDONLY)) {
 594                         status = -EACCES;
 595                         mlog(ML_ERROR, "Readonly device detected but readonly "
 596                              "mount was not specified.\n");
 597                         goto read_super_error;
 598                 }
 599
 600                 /* You should not be able to start a local heartbeat
 601                  * on a readonly device. */
 602                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 603                         status = -EROFS;
 604                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 605                              "device.\n");
 606                         goto read_super_error;
 607                 }
 608
 609                 status = ocfs2_check_journals_nolocks(osb);
 610                 if (status < 0) {
 611                         if (status == -EROFS)
 612                                 mlog(ML_ERROR, "Recovery required on readonly "
 613                                      "file system, but write access is "
 614                                      "unavailable.\n");
 615                         else
 616                                 mlog_errno(status);
 617                         goto read_super_error;
 618                 }
 619
 620                 ocfs2_set_ro_flag(osb, 1);
 621
 622                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 623                        "services will be utilized for this mount. Recovery "
 624                        "will be skipped.\n");
 625         }
 626
 627         if (!ocfs2_is_hard_readonly(osb)) {
 628                 if (sb->s_flags & MS_RDONLY)
 629                         ocfs2_set_ro_flag(osb, 0);
 630         }
 631
 632         status = ocfs2_verify_heartbeat(osb);
 633         if (status < 0) {
 634                 mlog_errno(status);
 635                 goto read_super_error;
 636         }
 637
 638         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 639                                                  ocfs2_debugfs_root);
 640         if (!osb->osb_debug_root) {
 641                 status = -EINVAL;
 642                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 643                 goto read_super_error;
 644         }
 645
 646         status = ocfs2_mount_volume(sb);
 647         if (osb->root_inode)
 648                 inode = igrab(osb->root_inode);
 649
 650         if (status < 0)
 651                 goto read_super_error;
 652
 653         if (!inode) {
 654                 status = -EIO;
 655                 mlog_errno(status);
 656                 goto read_super_error;
 657         }
 658
 659         root = d_alloc_root(inode);
 660         if (!root) {
 661                 status = -ENOMEM;
 662                 mlog_errno(status);
 663                 goto read_super_error;
 664         }
 665
 666         sb->s_root = root;
 667
 668         ocfs2_complete_mount_recovery(osb);
 669
 670         if (osb->s_mount_opt & OCFS2_MOUNT_TAGGED)
 671                 sb->s_flags |= MS_TAGGED;
 672
 673         if (ocfs2_mount_local(osb))
 674                 snprintf(nodestr, sizeof(nodestr), "local");
 675         else
 676                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
 677
 678         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 679                "with %s data mode.\n",
 680                osb->dev_str, nodestr, osb->slot_num,
 681                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 682                "ordered");
 683
 684         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 685         wake_up(&osb->osb_mount_event);
 686
 687         mlog_exit(status);
 688         return status;
 689
 690 read_super_error:
 691         if (bh != NULL)
 692                 brelse(bh);
 693
 694         if (inode)
 695                 iput(inode);
 696
 697         if (osb) {
 698                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 699                 wake_up(&osb->osb_mount_event);
 700                 ocfs2_dismount_volume(sb, 1);
 701         }
 702
 703         mlog_exit(status);
 704         return status;
 705 }
 706
 707 static int ocfs2_get_sb(struct file_system_type *fs_type,
 708                         int flags,
 709                         const char *dev_name,
 710                         void *data,
 711                         struct vfsmount *mnt)
 712 {
 713         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 714                            mnt);
 715 }
 716
 717 static struct file_system_type ocfs2_fs_type = {
 718         .owner          = THIS_MODULE,
 719         .name           = "ocfs2",
 720         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 721                                         * the fs? */
 722         .kill_sb        = kill_block_super, /* set to the generic one
 723                                              * right now, but do we
 724                                              * need to change that? */
 725         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 726         .next           = NULL
 727 };
 728
 729 static int ocfs2_parse_options(struct super_block *sb,
 730                                char *options,
 731                                unsigned long *mount_opt,
 732                                int is_remount)
 733 {
 734         int status;
 735         char *p;
 736
 737         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 738                    options ? options : "(none)");
 739
 740         *mount_opt = 0;
 741
 742         if (!options) {
 743                 status = 1;
 744                 goto bail;
 745         }
 746
 747         while ((p = strsep(&options, ",")) != NULL) {
 748                 int token, option;
 749                 substring_t args[MAX_OPT_ARGS];
 750                 struct ocfs2_super * osb = OCFS2_SB(sb);
 751
 752                 if (!*p)
 753                         continue;
 754
 755                 token = match_token(p, tokens, args);
 756                 switch (token) {
 757                 case Opt_hb_local:
 758                         *mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 759                         break;
 760                 case Opt_hb_none:
 761                         *mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 762                         break;
 763                 case Opt_barrier:
 764                         if (match_int(&args[0], &option)) {
 765                                 status = 0;
 766                                 goto bail;
 767                         }
 768                         if (option)
 769                                 *mount_opt |= OCFS2_MOUNT_BARRIER;
 770                         else
 771                                 *mount_opt &= ~OCFS2_MOUNT_BARRIER;
 772                         break;
 773                 case Opt_intr:
 774                         *mount_opt &= ~OCFS2_MOUNT_NOINTR;
 775                         break;
 776                 case Opt_nointr:
 777                         *mount_opt |= OCFS2_MOUNT_NOINTR;
 778                         break;
 779                 case Opt_err_panic:
 780                         *mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 781                         break;
 782                 case Opt_err_ro:
 783                         *mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 784                         break;
 785                 case Opt_data_ordered:
 786                         *mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 787                         break;
 788                 case Opt_data_writeback:
 789                         *mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 790                         break;
 791                 case Opt_atime_quantum:
 792                         if (match_int(&args[0], &option)) {
 793                                 status = 0;
 794                                 goto bail;
 795                         }
 796                         if (option >= 0)
 797                                 osb->s_atime_quantum = option;
 798                         else
 799                                 osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 800                         break;
 801 #ifndef CONFIG_TAGGING_NONE
 802                 case Opt_tag:
 803                         *mount_opt |= OCFS2_MOUNT_TAGGED;
 804                         break;
 805                 case Opt_notag:
 806                         *mount_opt &= ~OCFS2_MOUNT_TAGGED;
 807                         break;
 808 #endif
 809 #ifdef CONFIG_PROPAGATE
 810                 case Opt_tagid:
 811                         /* use args[0] */
 812                         *mount_opt |= OCFS2_MOUNT_TAGGED;
 813                         break;
 814 #endif
 815                 default:
 816                         mlog(ML_ERROR,
 817                              "Unrecognized mount option \"%s\" "
 818                              "or missing value\n", p);
 819                         status = 0;
 820                         goto bail;
 821                 }
 822         }
 823
 824         status = 1;
 825
 826 bail:
 827         mlog_exit(status);
 828         return status;
 829 }
 830
 831 static int __init ocfs2_init(void)
 832 {
 833         int status;
 834
 835         mlog_entry_void();
 836
 837         ocfs2_print_version();
 838
 839         if (init_ocfs2_extent_maps())
 840                 return -ENOMEM;
 841
 842         status = init_ocfs2_uptodate_cache();
 843         if (status < 0) {
 844                 mlog_errno(status);
 845                 goto leave;
 846         }
 847
 848         status = ocfs2_initialize_mem_caches();
 849         if (status < 0) {
 850                 mlog_errno(status);
 851                 goto leave;
 852         }
 853
 854         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
 855         if (!ocfs2_wq) {
 856                 status = -ENOMEM;
 857                 goto leave;
 858         }
 859
 860         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
 861         if (!ocfs2_debugfs_root) {
 862                 status = -EFAULT;
 863                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
 864         }
 865
 866 leave:
 867         if (status < 0) {
 868                 ocfs2_free_mem_caches();
 869                 exit_ocfs2_uptodate_cache();
 870                 exit_ocfs2_extent_maps();
 871         }
 872
 873         mlog_exit(status);
 874
 875         if (status >= 0) {
 876                 return register_filesystem(&ocfs2_fs_type);
 877         } else
 878                 return -1;
 879 }
 880
 881 static void __exit ocfs2_exit(void)
 882 {
 883         mlog_entry_void();
 884
 885         if (ocfs2_wq) {
 886                 flush_workqueue(ocfs2_wq);
 887                 destroy_workqueue(ocfs2_wq);
 888         }
 889
 890         debugfs_remove(ocfs2_debugfs_root);
 891
 892         ocfs2_free_mem_caches();
 893
 894         unregister_filesystem(&ocfs2_fs_type);
 895
 896         exit_ocfs2_extent_maps();
 897
 898         exit_ocfs2_uptodate_cache();
 899
 900         mlog_exit_void();
 901 }
 902
 903 static void ocfs2_put_super(struct super_block *sb)
 904 {
 905         mlog_entry("(0x%p)\n", sb);
 906
 907         ocfs2_sync_blockdev(sb);
 908         ocfs2_dismount_volume(sb, 0);
 909
 910         mlog_exit_void();
 911 }
 912
 913 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 914 {
 915         struct ocfs2_super *osb;
 916         u32 numbits, freebits;
 917         int status;
 918         struct ocfs2_dinode *bm_lock;
 919         struct buffer_head *bh = NULL;
 920         struct inode *inode = NULL;
 921
 922         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
 923
 924         osb = OCFS2_SB(dentry->d_sb);
 925
 926         inode = ocfs2_get_system_file_inode(osb,
 927                                             GLOBAL_BITMAP_SYSTEM_INODE,
 928                                             OCFS2_INVALID_SLOT);
 929         if (!inode) {
 930                 mlog(ML_ERROR, "failed to get bitmap inode\n");
 931                 status = -EIO;
 932                 goto bail;
 933         }
 934
 935         status = ocfs2_meta_lock(inode, &bh, 0);
 936         if (status < 0) {
 937                 mlog_errno(status);
 938                 goto bail;
 939         }
 940
 941         bm_lock = (struct ocfs2_dinode *) bh->b_data;
 942
 943         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
 944         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
 945
 946         buf->f_type = OCFS2_SUPER_MAGIC;
 947         buf->f_bsize = dentry->d_sb->s_blocksize;
 948         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
 949         buf->f_blocks = ((sector_t) numbits) *
 950                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
 951         buf->f_bfree = ((sector_t) freebits) *
 952                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
 953         buf->f_bavail = buf->f_bfree;
 954         buf->f_files = numbits;
 955         buf->f_ffree = freebits;
 956
 957         brelse(bh);
 958
 959         ocfs2_meta_unlock(inode, 0);
 960         status = 0;
 961 bail:
 962         if (inode)
 963                 iput(inode);
 964
 965         mlog_exit(status);
 966
 967         return status;
 968 }
 969
 970 static void ocfs2_inode_init_once(void *data,
 971                                   struct kmem_cache *cachep,
 972                                   unsigned long flags)
 973 {
 974         struct ocfs2_inode_info *oi = data;
 975
 976         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 977             SLAB_CTOR_CONSTRUCTOR) {
 978                 oi->ip_flags = 0;
 979                 oi->ip_open_count = 0;
 980                 spin_lock_init(&oi->ip_lock);
 981                 ocfs2_extent_map_init(&oi->vfs_inode);
 982                 INIT_LIST_HEAD(&oi->ip_io_markers);
 983                 oi->ip_created_trans = 0;
 984                 oi->ip_last_trans = 0;
 985                 oi->ip_dir_start_lookup = 0;
 986
 987                 init_rwsem(&oi->ip_alloc_sem);
 988                 mutex_init(&oi->ip_io_mutex);
 989
 990                 oi->ip_blkno = 0ULL;
 991                 oi->ip_clusters = 0;
 992
 993                 ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
 994                 ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
 995                 ocfs2_lock_res_init_once(&oi->ip_data_lockres);
 996
 997                 ocfs2_metadata_cache_init(&oi->vfs_inode);
 998
 999                 inode_init_once(&oi->vfs_inode);
1000         }
1001 }
1002
1003 static int ocfs2_initialize_mem_caches(void)
1004 {
1005         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1006                                        sizeof(struct ocfs2_inode_info),
1007                                        0,
1008                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1009                                                 SLAB_MEM_SPREAD),
1010                                        ocfs2_inode_init_once, NULL);
1011         if (!ocfs2_inode_cachep)
1012                 return -ENOMEM;
1013
1014         return 0;
1015 }
1016
1017 static void ocfs2_free_mem_caches(void)
1018 {
1019         if (ocfs2_inode_cachep)
1020                 kmem_cache_destroy(ocfs2_inode_cachep);
1021
1022         ocfs2_inode_cachep = NULL;
1023 }
1024
1025 static int ocfs2_get_sector(struct super_block *sb,
1026                             struct buffer_head **bh,
1027                             int block,
1028                             int sect_size)
1029 {
1030         if (!sb_set_blocksize(sb, sect_size)) {
1031                 mlog(ML_ERROR, "unable to set blocksize\n");
1032                 return -EIO;
1033         }
1034
1035         *bh = sb_getblk(sb, block);
1036         if (!*bh) {
1037                 mlog_errno(-EIO);
1038                 return -EIO;
1039         }
1040         lock_buffer(*bh);
1041         if (!buffer_dirty(*bh))
1042                 clear_buffer_uptodate(*bh);
1043         unlock_buffer(*bh);
1044         ll_rw_block(READ, 1, bh);
1045         wait_on_buffer(*bh);
1046         return 0;
1047 }
1048
1049 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1050 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1051 {
1052         int status;
1053
1054         /* XXX hold a ref on the node while mounte?  easy enough, if
1055          * desirable. */
1056         if (ocfs2_mount_local(osb))
1057                 osb->node_num = 0;
1058         else
1059                 osb->node_num = o2nm_this_node();
1060
1061         if (osb->node_num == O2NM_MAX_NODES) {
1062                 mlog(ML_ERROR, "could not find this host's node number\n");
1063                 status = -ENOENT;
1064                 goto bail;
1065         }
1066
1067         mlog(0, "I am node %d\n", osb->node_num);
1068
1069         status = 0;
1070 bail:
1071         return status;
1072 }
1073
1074 static int ocfs2_mount_volume(struct super_block *sb)
1075 {
1076         int status = 0;
1077         int unlock_super = 0;
1078         struct ocfs2_super *osb = OCFS2_SB(sb);
1079
1080         mlog_entry_void();
1081
1082         if (ocfs2_is_hard_readonly(osb))
1083                 goto leave;
1084
1085         status = ocfs2_fill_local_node_info(osb);
1086         if (status < 0) {
1087                 mlog_errno(status);
1088                 goto leave;
1089         }
1090
1091         status = ocfs2_register_hb_callbacks(osb);
1092         if (status < 0) {
1093                 mlog_errno(status);
1094                 goto leave;
1095         }
1096
1097         status = ocfs2_dlm_init(osb);
1098         if (status < 0) {
1099                 mlog_errno(status);
1100                 goto leave;
1101         }
1102
1103         /* requires vote_thread to be running. */
1104         status = ocfs2_register_net_handlers(osb);
1105         if (status < 0) {
1106                 mlog_errno(status);
1107                 goto leave;
1108         }
1109
1110         status = ocfs2_super_lock(osb, 1);
1111         if (status < 0) {
1112                 mlog_errno(status);
1113                 goto leave;
1114         }
1115         unlock_super = 1;
1116
1117         /* This will load up the node map and add ourselves to it. */
1118         status = ocfs2_find_slot(osb);
1119         if (status < 0) {
1120                 mlog_errno(status);
1121                 goto leave;
1122         }
1123
1124         ocfs2_populate_mounted_map(osb);
1125
1126         /* load all node-local system inodes */
1127         status = ocfs2_init_local_system_inodes(osb);
1128         if (status < 0) {
1129                 mlog_errno(status);
1130                 goto leave;
1131         }
1132
1133         status = ocfs2_check_volume(osb);
1134         if (status < 0) {
1135                 mlog_errno(status);
1136                 goto leave;
1137         }
1138
1139         status = ocfs2_truncate_log_init(osb);
1140         if (status < 0) {
1141                 mlog_errno(status);
1142                 goto leave;
1143         }
1144
1145         if (ocfs2_mount_local(osb))
1146                 goto leave;
1147
1148         /* This should be sent *after* we recovered our journal as it
1149          * will cause other nodes to unmark us as needing
1150          * recovery. However, we need to send it *before* dropping the
1151          * super block lock as otherwise their recovery threads might
1152          * try to clean us up while we're live! */
1153         status = ocfs2_request_mount_vote(osb);
1154         if (status < 0)
1155                 mlog_errno(status);
1156
1157 leave:
1158         if (unlock_super)
1159                 ocfs2_super_unlock(osb, 1);
1160
1161         mlog_exit(status);
1162         return status;
1163 }
1164
1165 /* we can't grab the goofy sem lock from inside wait_event, so we use
1166  * memory barriers to make sure that we'll see the null task before
1167  * being woken up */
1168 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1169 {
1170         mb();
1171         return osb->recovery_thread_task != NULL;
1172 }
1173
1174 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1175 {
1176         int tmp;
1177         struct ocfs2_super *osb = NULL;
1178         char nodestr[8];
1179
1180         mlog_entry("(0x%p)\n", sb);
1181
1182         BUG_ON(!sb);
1183         osb = OCFS2_SB(sb);
1184         BUG_ON(!osb);
1185
1186         ocfs2_shutdown_local_alloc(osb);
1187
1188         ocfs2_truncate_log_shutdown(osb);
1189
1190         /* disable any new recovery threads and wait for any currently
1191          * running ones to exit. Do this before setting the vol_state. */
1192         mutex_lock(&osb->recovery_lock);
1193         osb->disable_recovery = 1;
1194         mutex_unlock(&osb->recovery_lock);
1195         wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1196
1197         /* At this point, we know that no more recovery threads can be
1198          * launched, so wait for any recovery completion work to
1199          * complete. */
1200         flush_workqueue(ocfs2_wq);
1201
1202         ocfs2_journal_shutdown(osb);
1203
1204         ocfs2_sync_blockdev(sb);
1205
1206         /* No dlm means we've failed during mount, so skip all the
1207          * steps which depended on that to complete. */
1208         if (osb->dlm) {
1209                 tmp = ocfs2_super_lock(osb, 1);
1210                 if (tmp < 0) {
1211                         mlog_errno(tmp);
1212                         return;
1213                 }
1214
1215                 tmp = ocfs2_request_umount_vote(osb);
1216                 if (tmp < 0)
1217                         mlog_errno(tmp);
1218
1219                 if (osb->slot_num != OCFS2_INVALID_SLOT)
1220                         ocfs2_put_slot(osb);
1221
1222                 ocfs2_super_unlock(osb, 1);
1223         }
1224
1225         ocfs2_release_system_inodes(osb);
1226
1227         if (osb->dlm) {
1228                 ocfs2_unregister_net_handlers(osb);
1229
1230                 ocfs2_dlm_shutdown(osb);
1231         }
1232
1233         ocfs2_clear_hb_callbacks(osb);
1234
1235         debugfs_remove(osb->osb_debug_root);
1236
1237         if (!mnt_err)
1238                 ocfs2_stop_heartbeat(osb);
1239
1240         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1241
1242         if (ocfs2_mount_local(osb))
1243                 snprintf(nodestr, sizeof(nodestr), "local");
1244         else
1245                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1246
1247         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1248                osb->dev_str, nodestr);
1249
1250         ocfs2_delete_osb(osb);
1251         kfree(osb);
1252         sb->s_dev = 0;
1253         sb->s_fs_info = NULL;
1254 }
1255
1256 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1257                                 unsigned uuid_bytes)
1258 {
1259         int i, ret;
1260         char *ptr;
1261
1262         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1263
1264         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1265         if (osb->uuid_str == NULL)
1266                 return -ENOMEM;
1267
1268         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1269                 /* print with null */
1270                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1271                 if (ret != 2) /* drop super cleans up */
1272                         return -EINVAL;
1273                 /* then only advance past the last char */
1274                 ptr += 2;
1275         }
1276
1277         return 0;
1278 }
1279
1280 static int ocfs2_initialize_super(struct super_block *sb,
1281                                   struct buffer_head *bh,
1282                                   int sector_size)
1283 {
1284         int status = 0;
1285         int i;
1286         struct ocfs2_dinode *di = NULL;
1287         struct inode *inode = NULL;
1288         struct buffer_head *bitmap_bh = NULL;
1289         struct ocfs2_journal *journal;
1290         __le32 uuid_net_key;
1291         struct ocfs2_super *osb;
1292
1293         mlog_entry_void();
1294
1295         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1296         if (!osb) {
1297                 status = -ENOMEM;
1298                 mlog_errno(status);
1299                 goto bail;
1300         }
1301
1302         sb->s_fs_info = osb;
1303         sb->s_op = &ocfs2_sops;
1304         sb->s_export_op = &ocfs2_export_ops;
1305         sb->s_flags |= MS_NOATIME;
1306         /* this is needed to support O_LARGEFILE */
1307         sb->s_maxbytes = ocfs2_max_file_offset(sb->s_blocksize_bits);
1308
1309         osb->sb = sb;
1310         /* Save off for ocfs2_rw_direct */
1311         osb->s_sectsize_bits = blksize_bits(sector_size);
1312         BUG_ON(!osb->s_sectsize_bits);
1313
1314         osb->net_response_ids = 0;
1315         spin_lock_init(&osb->net_response_lock);
1316         INIT_LIST_HEAD(&osb->net_response_list);
1317
1318         INIT_LIST_HEAD(&osb->osb_net_handlers);
1319         init_waitqueue_head(&osb->recovery_event);
1320         spin_lock_init(&osb->vote_task_lock);
1321         init_waitqueue_head(&osb->vote_event);
1322         osb->vote_work_sequence = 0;
1323         osb->vote_wake_sequence = 0;
1324         INIT_LIST_HEAD(&osb->blocked_lock_list);
1325         osb->blocked_lock_count = 0;
1326         INIT_LIST_HEAD(&osb->vote_list);
1327         spin_lock_init(&osb->osb_lock);
1328
1329         atomic_set(&osb->alloc_stats.moves, 0);
1330         atomic_set(&osb->alloc_stats.local_data, 0);
1331         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1332         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1333         atomic_set(&osb->alloc_stats.bg_extends, 0);
1334
1335         ocfs2_init_node_maps(osb);
1336
1337         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1338                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1339
1340         mutex_init(&osb->recovery_lock);
1341
1342         osb->disable_recovery = 0;
1343         osb->recovery_thread_task = NULL;
1344
1345         init_waitqueue_head(&osb->checkpoint_event);
1346         atomic_set(&osb->needs_checkpoint, 0);
1347
1348         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1349
1350         osb->node_num = O2NM_INVALID_NODE_NUM;
1351         osb->slot_num = OCFS2_INVALID_SLOT;
1352
1353         osb->local_alloc_state = OCFS2_LA_UNUSED;
1354         osb->local_alloc_bh = NULL;
1355
1356         ocfs2_setup_hb_callbacks(osb);
1357
1358         init_waitqueue_head(&osb->osb_mount_event);
1359
1360         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1361         if (!osb->vol_label) {
1362                 mlog(ML_ERROR, "unable to alloc vol label\n");
1363                 status = -ENOMEM;
1364                 goto bail;
1365         }
1366
1367         di = (struct ocfs2_dinode *)bh->b_data;
1368
1369         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1370         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1371                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1372                      osb->max_slots);
1373                 status = -EINVAL;
1374                 goto bail;
1375         }
1376         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1377
1378         init_waitqueue_head(&osb->osb_wipe_event);
1379         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1380                                         sizeof(*osb->osb_orphan_wipes),
1381                                         GFP_KERNEL);
1382         if (!osb->osb_orphan_wipes) {
1383                 status = -ENOMEM;
1384                 mlog_errno(status);
1385                 goto bail;
1386         }
1387
1388         osb->s_feature_compat =
1389                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1390         osb->s_feature_ro_compat =
1391                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1392         osb->s_feature_incompat =
1393                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1394
1395         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1396                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1397                      "optional features (%x).\n", i);
1398                 status = -EINVAL;
1399                 goto bail;
1400         }
1401         if (!(osb->sb->s_flags & MS_RDONLY) &&
1402             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1403                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1404                      "unsupported optional features (%x).\n", i);
1405                 status = -EINVAL;
1406                 goto bail;
1407         }
1408
1409         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1410
1411         /* FIXME
1412          * This should be done in ocfs2_journal_init(), but unknown
1413          * ordering issues will cause the filesystem to crash.
1414          * If anyone wants to figure out what part of the code
1415          * refers to osb->journal before ocfs2_journal_init() is run,
1416          * be my guest.
1417          */
1418         /* initialize our journal structure */
1419
1420         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1421         if (!journal) {
1422                 mlog(ML_ERROR, "unable to alloc journal\n");
1423                 status = -ENOMEM;
1424                 goto bail;
1425         }
1426         osb->journal = journal;
1427         journal->j_osb = osb;
1428
1429         atomic_set(&journal->j_num_trans, 0);
1430         init_rwsem(&journal->j_trans_barrier);
1431         init_waitqueue_head(&journal->j_checkpointed);
1432         spin_lock_init(&journal->j_lock);
1433         journal->j_trans_id = (unsigned long) 1;
1434         INIT_LIST_HEAD(&journal->j_la_cleanups);
1435         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1436         journal->j_state = OCFS2_JOURNAL_FREE;
1437
1438         /* get some pseudo constants for clustersize bits */
1439         osb->s_clustersize_bits =
1440                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1441         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1442         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1443
1444         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1445             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1446                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1447                      osb->s_clustersize);
1448                 status = -EINVAL;
1449                 goto bail;
1450         }
1451
1452         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1453             > (u32)~0UL) {
1454                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1455                      "what jbd can address in 32 bits.\n");
1456                 status = -EINVAL;
1457                 goto bail;
1458         }
1459
1460         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1461                                  sizeof(di->id2.i_super.s_uuid))) {
1462                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1463                 status = -ENOMEM;
1464                 goto bail;
1465         }
1466
1467         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1468         osb->net_key = le32_to_cpu(uuid_net_key);
1469
1470         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1471         osb->vol_label[63] = '\0';
1472         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1473         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1474         osb->first_cluster_group_blkno =
1475                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1476         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1477         mlog(0, "vol_label: %s\n", osb->vol_label);
1478         mlog(0, "uuid: %s\n", osb->uuid_str);
1479         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1480              (unsigned long long)osb->root_blkno,
1481              (unsigned long long)osb->system_dir_blkno);
1482
1483         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1484         if (!osb->osb_dlm_debug) {
1485                 status = -ENOMEM;
1486                 mlog_errno(status);
1487                 goto bail;
1488         }
1489
1490         atomic_set(&osb->vol_state, VOLUME_INIT);
1491
1492         /* load root, system_dir, and all global system inodes */
1493         status = ocfs2_init_global_system_inodes(osb);
1494         if (status < 0) {
1495                 mlog_errno(status);
1496                 goto bail;
1497         }
1498
1499         /*
1500          * global bitmap
1501          */
1502         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1503                                             OCFS2_INVALID_SLOT);
1504         if (!inode) {
1505                 status = -EINVAL;
1506                 mlog_errno(status);
1507                 goto bail;
1508         }
1509
1510         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1511
1512         /* We don't have a cluster lock on the bitmap here because
1513          * we're only interested in static information and the extra
1514          * complexity at mount time isn't worht it. Don't pass the
1515          * inode in to the read function though as we don't want it to
1516          * be put in the cache. */
1517         status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1518                                   NULL);
1519         iput(inode);
1520         if (status < 0) {
1521                 mlog_errno(status);
1522                 goto bail;
1523         }
1524
1525         di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1526         osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1527         brelse(bitmap_bh);
1528         mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1529              (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1530
1531         status = ocfs2_init_slot_info(osb);
1532         if (status < 0) {
1533                 mlog_errno(status);
1534                 goto bail;
1535         }
1536
1537 bail:
1538         mlog_exit(status);
1539         return status;
1540 }
1541
1542 /*
1543  * will return: -EAGAIN if it is ok to keep searching for superblocks
1544  *              -EINVAL if there is a bad superblock
1545  *              0 on success
1546  */
1547 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1548                                struct buffer_head *bh,
1549                                u32 blksz)
1550 {
1551         int status = -EAGAIN;
1552
1553         mlog_entry_void();
1554
1555         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1556                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1557                 status = -EINVAL;
1558                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1559                         mlog(ML_ERROR, "found superblock with incorrect block "
1560                              "size: found %u, should be %u\n",
1561                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1562                                blksz);
1563                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1564                            OCFS2_MAJOR_REV_LEVEL ||
1565                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1566                            OCFS2_MINOR_REV_LEVEL) {
1567                         mlog(ML_ERROR, "found superblock with bad version: "
1568                              "found %u.%u, should be %u.%u\n",
1569                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1570                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1571                              OCFS2_MAJOR_REV_LEVEL,
1572                              OCFS2_MINOR_REV_LEVEL);
1573                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1574                         mlog(ML_ERROR, "bad block number on superblock: "
1575                              "found %llu, should be %llu\n",
1576                              (unsigned long long)di->i_blkno,
1577                              (unsigned long long)bh->b_blocknr);
1578                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1579                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1580                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1581                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1582                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1583                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1584                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1585                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1586                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1587                         mlog(ML_ERROR,
1588                              "Superblock slots found greater than file system "
1589                              "maximum: found %u, max %u\n",
1590                              le16_to_cpu(di->id2.i_super.s_max_slots),
1591                              OCFS2_MAX_SLOTS);
1592                 } else {
1593                         /* found it! */
1594                         status = 0;
1595                 }
1596         }
1597
1598         mlog_exit(status);
1599         return status;
1600 }
1601
1602 static int ocfs2_check_volume(struct ocfs2_super *osb)
1603 {
1604         int status = 0;
1605         int dirty;
1606         int local;
1607         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1608                                                   * recover
1609                                                   * ourselves. */
1610
1611         mlog_entry_void();
1612
1613         /* Init our journal object. */
1614         status = ocfs2_journal_init(osb->journal, &dirty);
1615         if (status < 0) {
1616                 mlog(ML_ERROR, "Could not initialize journal!\n");
1617                 goto finally;
1618         }
1619
1620         /* If the journal was unmounted cleanly then we don't want to
1621          * recover anything. Otherwise, journal_load will do that
1622          * dirty work for us :) */
1623         if (!dirty) {
1624                 status = ocfs2_journal_wipe(osb->journal, 0);
1625                 if (status < 0) {
1626                         mlog_errno(status);
1627                         goto finally;
1628                 }
1629         } else {
1630                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1631                      "recovering volume.\n");
1632         }
1633
1634         local = ocfs2_mount_local(osb);
1635
1636         /* will play back anything left in the journal. */
1637         ocfs2_journal_load(osb->journal, local);
1638
1639         if (dirty) {
1640                 /* recover my local alloc if we didn't unmount cleanly. */
1641                 status = ocfs2_begin_local_alloc_recovery(osb,
1642                                                           osb->slot_num,
1643                                                           &local_alloc);
1644                 if (status < 0) {
1645                         mlog_errno(status);
1646                         goto finally;
1647                 }
1648                 /* we complete the recovery process after we've marked
1649                  * ourselves as mounted. */
1650         }
1651
1652         mlog(0, "Journal loaded.\n");
1653
1654         status = ocfs2_load_local_alloc(osb);
1655         if (status < 0) {
1656                 mlog_errno(status);
1657                 goto finally;
1658         }
1659
1660         if (dirty) {
1661                 /* Recovery will be completed after we've mounted the
1662                  * rest of the volume. */
1663                 osb->dirty = 1;
1664                 osb->local_alloc_copy = local_alloc;
1665                 local_alloc = NULL;
1666         }
1667
1668         /* go through each journal, trylock it and if you get the
1669          * lock, and it's marked as dirty, set the bit in the recover
1670          * map and launch a recovery thread for it. */
1671         status = ocfs2_mark_dead_nodes(osb);
1672         if (status < 0)
1673                 mlog_errno(status);
1674
1675 finally:
1676         if (local_alloc)
1677                 kfree(local_alloc);
1678
1679         mlog_exit(status);
1680         return status;
1681 }
1682
1683 /*
1684  * The routine gets called from dismount or close whenever a dismount on
1685  * volume is requested and the osb open count becomes 1.
1686  * It will remove the osb from the global list and also free up all the
1687  * initialized resources and fileobject.
1688  */
1689 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1690 {
1691         mlog_entry_void();
1692
1693         /* This function assumes that the caller has the main osb resource */
1694
1695         if (osb->slot_info)
1696                 ocfs2_free_slot_info(osb->slot_info);
1697
1698         kfree(osb->osb_orphan_wipes);
1699         /* FIXME
1700          * This belongs in journal shutdown, but because we have to
1701          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1702          * we free it here.
1703          */
1704         kfree(osb->journal);
1705         if (osb->local_alloc_copy)
1706                 kfree(osb->local_alloc_copy);
1707         kfree(osb->uuid_str);
1708         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1709         memset(osb, 0, sizeof(struct ocfs2_super));
1710
1711         mlog_exit_void();
1712 }
1713
1714 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1715  * panic(). We do not support continue-on-error operation. */
1716 static void ocfs2_handle_error(struct super_block *sb)
1717 {
1718         struct ocfs2_super *osb = OCFS2_SB(sb);
1719
1720         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1721                 panic("OCFS2: (device %s): panic forced after error\n",
1722                       sb->s_id);
1723
1724         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1725
1726         if (sb->s_flags & MS_RDONLY &&
1727             (ocfs2_is_soft_readonly(osb) ||
1728              ocfs2_is_hard_readonly(osb)))
1729                 return;
1730
1731         printk(KERN_CRIT "File system is now read-only due to the potential "
1732                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1733                "system is unmounted.\n");
1734         sb->s_flags |= MS_RDONLY;
1735         ocfs2_set_ro_flag(osb, 0);
1736 }
1737
1738 static char error_buf[1024];
1739
1740 void __ocfs2_error(struct super_block *sb,
1741                    const char *function,
1742                    const char *fmt, ...)
1743 {
1744         va_list args;
1745
1746         va_start(args, fmt);
1747         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1748         va_end(args);
1749
1750         /* Not using mlog here because we want to show the actual
1751          * function the error came from. */
1752         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1753                sb->s_id, function, error_buf);
1754
1755         ocfs2_handle_error(sb);
1756 }
1757
1758 /* Handle critical errors. This is intentionally more drastic than
1759  * ocfs2_handle_error, so we only use for things like journal errors,
1760  * etc. */
1761 void __ocfs2_abort(struct super_block* sb,
1762                    const char *function,
1763                    const char *fmt, ...)
1764 {
1765         va_list args;
1766
1767         va_start(args, fmt);
1768         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1769         va_end(args);
1770
1771         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1772                sb->s_id, function, error_buf);
1773
1774         /* We don't have the cluster support yet to go straight to
1775          * hard readonly in here. Until then, we want to keep
1776          * ocfs2_abort() so that we can at least mark critical
1777          * errors.
1778          *
1779          * TODO: This should abort the journal and alert other nodes
1780          * that our slot needs recovery. */
1781
1782         /* Force a panic(). This stinks, but it's better than letting
1783          * things continue without having a proper hard readonly
1784          * here. */
1785         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1786         ocfs2_handle_error(sb);
1787 }
1788
1789 module_init(ocfs2_init);
1790 module_exit(ocfs2_exit);