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