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 #include <linux/mount.h>
  43
  44 #include <cluster/nodemanager.h>
  45
  46 #define MLOG_MASK_PREFIX ML_SUPER
  47 #include <cluster/masklog.h>
  48
  49 #include "ocfs2.h"
  50
  51 /* this should be the only file to include a version 1 header */
  52 #include "ocfs1_fs_compat.h"
  53
  54 #include "alloc.h"
  55 #include "dlmglue.h"
  56 #include "export.h"
  57 #include "extent_map.h"
  58 #include "heartbeat.h"
  59 #include "inode.h"
  60 #include "journal.h"
  61 #include "localalloc.h"
  62 #include "namei.h"
  63 #include "slot_map.h"
  64 #include "super.h"
  65 #include "sysfile.h"
  66 #include "uptodate.h"
  67 #include "ver.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 struct mount_options
  85 {
  86         unsigned long   commit_interval;
  87         unsigned long   mount_opt;
  88         unsigned int    atime_quantum;
  89         signed short    slot;
  90         unsigned int    localalloc_opt;
  91 };
  92
  93 static int ocfs2_parse_options(struct super_block *sb, char *options,
  94                                struct mount_options *mopt,
  95                                int is_remount);
  96 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
  97 static void ocfs2_put_super(struct super_block *sb);
  98 static int ocfs2_mount_volume(struct super_block *sb);
  99 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 100 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 101 static int ocfs2_initialize_mem_caches(void);
 102 static void ocfs2_free_mem_caches(void);
 103 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 104
 105 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 106
 107 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 108
 109 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 110 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 111 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 112 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
 113 static int ocfs2_check_volume(struct ocfs2_super *osb);
 114 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 115                                struct buffer_head *bh,
 116                                u32 sectsize);
 117 static int ocfs2_initialize_super(struct super_block *sb,
 118                                   struct buffer_head *bh,
 119                                   int sector_size);
 120 static int ocfs2_get_sector(struct super_block *sb,
 121                             struct buffer_head **bh,
 122                             int block,
 123                             int sect_size);
 124 static void ocfs2_write_super(struct super_block *sb);
 125 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 126 static void ocfs2_destroy_inode(struct inode *inode);
 127
 128 static const struct super_operations ocfs2_sops = {
 129         .statfs         = ocfs2_statfs,
 130         .alloc_inode    = ocfs2_alloc_inode,
 131         .destroy_inode  = ocfs2_destroy_inode,
 132         .drop_inode     = ocfs2_drop_inode,
 133         .clear_inode    = ocfs2_clear_inode,
 134         .delete_inode   = ocfs2_delete_inode,
 135         .sync_fs        = ocfs2_sync_fs,
 136         .write_super    = ocfs2_write_super,
 137         .put_super      = ocfs2_put_super,
 138         .remount_fs     = ocfs2_remount,
 139         .show_options   = ocfs2_show_options,
 140 };
 141
 142 enum {
 143         Opt_barrier,
 144         Opt_err_panic,
 145         Opt_err_ro,
 146         Opt_intr,
 147         Opt_nointr,
 148         Opt_hb_none,
 149         Opt_hb_local,
 150         Opt_data_ordered,
 151         Opt_data_writeback,
 152         Opt_atime_quantum,
 153         Opt_slot,
 154         Opt_commit,
 155         Opt_localalloc,
 156         Opt_localflocks,
 157         Opt_err,
 158 };
 159
 160 static match_table_t tokens = {
 161         {Opt_barrier, "barrier=%u"},
 162         {Opt_err_panic, "errors=panic"},
 163         {Opt_err_ro, "errors=remount-ro"},
 164         {Opt_intr, "intr"},
 165         {Opt_nointr, "nointr"},
 166         {Opt_hb_none, OCFS2_HB_NONE},
 167         {Opt_hb_local, OCFS2_HB_LOCAL},
 168         {Opt_data_ordered, "data=ordered"},
 169         {Opt_data_writeback, "data=writeback"},
 170         {Opt_atime_quantum, "atime_quantum=%u"},
 171         {Opt_slot, "preferred_slot=%u"},
 172         {Opt_commit, "commit=%u"},
 173         {Opt_localalloc, "localalloc=%d"},
 174         {Opt_localflocks, "localflocks"},
 175         {Opt_err, NULL}
 176 };
 177
 178 /*
 179  * write_super and sync_fs ripped right out of ext3.
 180  */
 181 static void ocfs2_write_super(struct super_block *sb)
 182 {
 183         if (mutex_trylock(&sb->s_lock) != 0)
 184                 BUG();
 185         sb->s_dirt = 0;
 186 }
 187
 188 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 189 {
 190         int status;
 191         tid_t target;
 192         struct ocfs2_super *osb = OCFS2_SB(sb);
 193
 194         sb->s_dirt = 0;
 195
 196         if (ocfs2_is_hard_readonly(osb))
 197                 return -EROFS;
 198
 199         if (wait) {
 200                 status = ocfs2_flush_truncate_log(osb);
 201                 if (status < 0)
 202                         mlog_errno(status);
 203         } else {
 204                 ocfs2_schedule_truncate_log_flush(osb, 0);
 205         }
 206
 207         if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
 208                 if (wait)
 209                         log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 210                                         target);
 211         }
 212         return 0;
 213 }
 214
 215 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 216 {
 217         struct inode *new = NULL;
 218         int status = 0;
 219         int i;
 220
 221         mlog_entry_void();
 222
 223         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 224         if (IS_ERR(new)) {
 225                 status = PTR_ERR(new);
 226                 mlog_errno(status);
 227                 goto bail;
 228         }
 229         osb->root_inode = new;
 230
 231         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 232         if (IS_ERR(new)) {
 233                 status = PTR_ERR(new);
 234                 mlog_errno(status);
 235                 goto bail;
 236         }
 237         osb->sys_root_inode = new;
 238
 239         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 240              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 241                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 242                 if (!new) {
 243                         ocfs2_release_system_inodes(osb);
 244                         status = -EINVAL;
 245                         mlog_errno(status);
 246                         /* FIXME: Should ERROR_RO_FS */
 247                         mlog(ML_ERROR, "Unable to load system inode %d, "
 248                              "possibly corrupt fs?", i);
 249                         goto bail;
 250                 }
 251                 // the array now has one ref, so drop this one
 252                 iput(new);
 253         }
 254
 255 bail:
 256         mlog_exit(status);
 257         return status;
 258 }
 259
 260 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 261 {
 262         struct inode *new = NULL;
 263         int status = 0;
 264         int i;
 265
 266         mlog_entry_void();
 267
 268         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 269              i < NUM_SYSTEM_INODES;
 270              i++) {
 271                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 272                 if (!new) {
 273                         ocfs2_release_system_inodes(osb);
 274                         status = -EINVAL;
 275                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 276                              status, i, osb->slot_num);
 277                         goto bail;
 278                 }
 279                 /* the array now has one ref, so drop this one */
 280                 iput(new);
 281         }
 282
 283 bail:
 284         mlog_exit(status);
 285         return status;
 286 }
 287
 288 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 289 {
 290         int i;
 291         struct inode *inode;
 292
 293         mlog_entry_void();
 294
 295         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 296                 inode = osb->system_inodes[i];
 297                 if (inode) {
 298                         iput(inode);
 299                         osb->system_inodes[i] = NULL;
 300                 }
 301         }
 302
 303         inode = osb->sys_root_inode;
 304         if (inode) {
 305                 iput(inode);
 306                 osb->sys_root_inode = NULL;
 307         }
 308
 309         inode = osb->root_inode;
 310         if (inode) {
 311                 iput(inode);
 312                 osb->root_inode = NULL;
 313         }
 314
 315         mlog_exit(0);
 316 }
 317
 318 /* We're allocating fs objects, use GFP_NOFS */
 319 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 320 {
 321         struct ocfs2_inode_info *oi;
 322
 323         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 324         if (!oi)
 325                 return NULL;
 326
 327         return &oi->vfs_inode;
 328 }
 329
 330 static void ocfs2_destroy_inode(struct inode *inode)
 331 {
 332         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 333 }
 334
 335 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 336                                                 unsigned int cbits)
 337 {
 338         unsigned int bytes = 1 << cbits;
 339         unsigned int trim = bytes;
 340         unsigned int bitshift = 32;
 341
 342         /*
 343          * i_size and all block offsets in ocfs2 are always 64 bits
 344          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 345          * 64 bit platforms, cluster size will be the limiting factor.
 346          */
 347
 348 #if BITS_PER_LONG == 32
 349 # if defined(CONFIG_LBD)
 350         BUILD_BUG_ON(sizeof(sector_t) != 8);
 351         /*
 352          * We might be limited by page cache size.
 353          */
 354         if (bytes > PAGE_CACHE_SIZE) {
 355                 bytes = PAGE_CACHE_SIZE;
 356                 trim = 1;
 357                 /*
 358                  * Shift by 31 here so that we don't get larger than
 359                  * MAX_LFS_FILESIZE
 360                  */
 361                 bitshift = 31;
 362         }
 363 # else
 364         /*
 365          * We are limited by the size of sector_t. Use block size, as
 366          * that's what we expose to the VFS.
 367          */
 368         bytes = 1 << bbits;
 369         trim = 1;
 370         bitshift = 31;
 371 # endif
 372 #endif
 373
 374         /*
 375          * Trim by a whole cluster when we can actually approach the
 376          * on-disk limits. Otherwise we can overflow i_clusters when
 377          * an extent start is at the max offset.
 378          */
 379         return (((unsigned long long)bytes) << bitshift) - trim;
 380 }
 381
 382 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 383 {
 384         int incompat_features;
 385         int ret = 0;
 386         struct mount_options parsed_options;
 387         struct ocfs2_super *osb = OCFS2_SB(sb);
 388
 389         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 390                 ret = -EINVAL;
 391                 goto out;
 392         }
 393
 394         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 395             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 396                 ret = -EINVAL;
 397                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 398                 goto out;
 399         }
 400
 401         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 402             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 403                 ret = -EINVAL;
 404                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 405                 goto out;
 406         }
 407
 408         /* We're going to/from readonly mode. */
 409         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 410                 /* Lock here so the check of HARD_RO and the potential
 411                  * setting of SOFT_RO is atomic. */
 412                 spin_lock(&osb->osb_lock);
 413                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 414                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 415                         ret = -EROFS;
 416                         goto unlock_osb;
 417                 }
 418
 419                 if (*flags & MS_RDONLY) {
 420                         mlog(0, "Going to ro mode.\n");
 421                         sb->s_flags |= MS_RDONLY;
 422                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 423                 } else {
 424                         mlog(0, "Making ro filesystem writeable.\n");
 425
 426                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 427                                 mlog(ML_ERROR, "Cannot remount RDWR "
 428                                      "filesystem due to previous errors.\n");
 429                                 ret = -EROFS;
 430                                 goto unlock_osb;
 431                         }
 432                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 433                         if (incompat_features) {
 434                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 435                                      "of unsupported optional features "
 436                                      "(%x).\n", incompat_features);
 437                                 ret = -EINVAL;
 438                                 goto unlock_osb;
 439                         }
 440                         sb->s_flags &= ~MS_RDONLY;
 441                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 442                 }
 443 unlock_osb:
 444                 spin_unlock(&osb->osb_lock);
 445         }
 446
 447         if (!ret) {
 448                 /* Only save off the new mount options in case of a successful
 449                  * remount. */
 450                 osb->s_mount_opt = parsed_options.mount_opt;
 451                 osb->s_atime_quantum = parsed_options.atime_quantum;
 452                 osb->preferred_slot = parsed_options.slot;
 453                 if (parsed_options.commit_interval)
 454                         osb->osb_commit_interval = parsed_options.commit_interval;
 455
 456                 if (!ocfs2_is_hard_readonly(osb))
 457                         ocfs2_set_journal_params(osb);
 458         }
 459 out:
 460         return ret;
 461 }
 462
 463 static int ocfs2_sb_probe(struct super_block *sb,
 464                           struct buffer_head **bh,
 465                           int *sector_size)
 466 {
 467         int status, tmpstat;
 468         struct ocfs1_vol_disk_hdr *hdr;
 469         struct ocfs2_dinode *di;
 470         int blksize;
 471
 472         *bh = NULL;
 473
 474         /* may be > 512 */
 475         *sector_size = bdev_hardsect_size(sb->s_bdev);
 476         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 477                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 478                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 479                 status = -EINVAL;
 480                 goto bail;
 481         }
 482
 483         /* Can this really happen? */
 484         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 485                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 486
 487         /* check block zero for old format */
 488         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 489         if (status < 0) {
 490                 mlog_errno(status);
 491                 goto bail;
 492         }
 493         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 494         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 495                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 496                      hdr->major_version, hdr->minor_version);
 497                 status = -EINVAL;
 498         }
 499         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 500                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 501                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 502                      hdr->signature);
 503                 status = -EINVAL;
 504         }
 505         brelse(*bh);
 506         *bh = NULL;
 507         if (status < 0) {
 508                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 509                      "upgraded before mounting with ocfs v2\n");
 510                 goto bail;
 511         }
 512
 513         /*
 514          * Now check at magic offset for 512, 1024, 2048, 4096
 515          * blocksizes.  4096 is the maximum blocksize because it is
 516          * the minimum clustersize.
 517          */
 518         status = -EINVAL;
 519         for (blksize = *sector_size;
 520              blksize <= OCFS2_MAX_BLOCKSIZE;
 521              blksize <<= 1) {
 522                 tmpstat = ocfs2_get_sector(sb, bh,
 523                                            OCFS2_SUPER_BLOCK_BLKNO,
 524                                            blksize);
 525                 if (tmpstat < 0) {
 526                         status = tmpstat;
 527                         mlog_errno(status);
 528                         goto bail;
 529                 }
 530                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 531                 status = ocfs2_verify_volume(di, *bh, blksize);
 532                 if (status >= 0)
 533                         goto bail;
 534                 brelse(*bh);
 535                 *bh = NULL;
 536                 if (status != -EAGAIN)
 537                         break;
 538         }
 539
 540 bail:
 541         return status;
 542 }
 543
 544 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 545 {
 546         if (ocfs2_mount_local(osb)) {
 547                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 548                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 549                              "mounted device.\n");
 550                         return -EINVAL;
 551                 }
 552         }
 553
 554         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 555                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
 556                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 557                              "a read-write clustered device.\n");
 558                         return -EINVAL;
 559                 }
 560         }
 561
 562         return 0;
 563 }
 564
 565 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 566 {
 567         struct dentry *root;
 568         int status, sector_size;
 569         struct mount_options parsed_options;
 570         struct inode *inode = NULL;
 571         struct ocfs2_super *osb = NULL;
 572         struct buffer_head *bh = NULL;
 573         char nodestr[8];
 574
 575         mlog_entry("%p, %p, %i", sb, data, silent);
 576
 577         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 578                 status = -EINVAL;
 579                 goto read_super_error;
 580         }
 581
 582         /* for now we only have one cluster/node, make sure we see it
 583          * in the heartbeat universe */
 584         if (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 585                 if (!o2hb_check_local_node_heartbeating()) {
 586                         status = -EINVAL;
 587                         goto read_super_error;
 588                 }
 589         }
 590
 591         /* probe for superblock */
 592         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 593         if (status < 0) {
 594                 mlog(ML_ERROR, "superblock probe failed!\n");
 595                 goto read_super_error;
 596         }
 597
 598         status = ocfs2_initialize_super(sb, bh, sector_size);
 599         osb = OCFS2_SB(sb);
 600         if (status < 0) {
 601                 mlog_errno(status);
 602                 goto read_super_error;
 603         }
 604         brelse(bh);
 605         bh = NULL;
 606         osb->s_mount_opt = parsed_options.mount_opt;
 607         osb->s_atime_quantum = parsed_options.atime_quantum;
 608         osb->preferred_slot = parsed_options.slot;
 609         osb->osb_commit_interval = parsed_options.commit_interval;
 610         osb->local_alloc_size = parsed_options.localalloc_opt;
 611
 612         sb->s_magic = OCFS2_SUPER_MAGIC;
 613
 614         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 615          * heartbeat=none */
 616         if (bdev_read_only(sb->s_bdev)) {
 617                 if (!(sb->s_flags & MS_RDONLY)) {
 618                         status = -EACCES;
 619                         mlog(ML_ERROR, "Readonly device detected but readonly "
 620                              "mount was not specified.\n");
 621                         goto read_super_error;
 622                 }
 623
 624                 /* You should not be able to start a local heartbeat
 625                  * on a readonly device. */
 626                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 627                         status = -EROFS;
 628                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 629                              "device.\n");
 630                         goto read_super_error;
 631                 }
 632
 633                 status = ocfs2_check_journals_nolocks(osb);
 634                 if (status < 0) {
 635                         if (status == -EROFS)
 636                                 mlog(ML_ERROR, "Recovery required on readonly "
 637                                      "file system, but write access is "
 638                                      "unavailable.\n");
 639                         else
 640                                 mlog_errno(status);
 641                         goto read_super_error;
 642                 }
 643
 644                 ocfs2_set_ro_flag(osb, 1);
 645
 646                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 647                        "services will be utilized for this mount. Recovery "
 648                        "will be skipped.\n");
 649         }
 650
 651         if (!ocfs2_is_hard_readonly(osb)) {
 652                 if (sb->s_flags & MS_RDONLY)
 653                         ocfs2_set_ro_flag(osb, 0);
 654         }
 655
 656         status = ocfs2_verify_heartbeat(osb);
 657         if (status < 0) {
 658                 mlog_errno(status);
 659                 goto read_super_error;
 660         }
 661
 662         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 663                                                  ocfs2_debugfs_root);
 664         if (!osb->osb_debug_root) {
 665                 status = -EINVAL;
 666                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 667                 goto read_super_error;
 668         }
 669
 670         status = ocfs2_mount_volume(sb);
 671         if (osb->root_inode)
 672                 inode = igrab(osb->root_inode);
 673
 674         if (status < 0)
 675                 goto read_super_error;
 676
 677         if (!inode) {
 678                 status = -EIO;
 679                 mlog_errno(status);
 680                 goto read_super_error;
 681         }
 682
 683         root = d_alloc_root(inode);
 684         if (!root) {
 685                 status = -ENOMEM;
 686                 mlog_errno(status);
 687                 goto read_super_error;
 688         }
 689
 690         sb->s_root = root;
 691
 692         ocfs2_complete_mount_recovery(osb);
 693
 694         if (ocfs2_mount_local(osb))
 695                 snprintf(nodestr, sizeof(nodestr), "local");
 696         else
 697                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
 698
 699         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 700                "with %s data mode.\n",
 701                osb->dev_str, nodestr, osb->slot_num,
 702                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 703                "ordered");
 704
 705         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 706         wake_up(&osb->osb_mount_event);
 707
 708         mlog_exit(status);
 709         return status;
 710
 711 read_super_error:
 712         if (bh != NULL)
 713                 brelse(bh);
 714
 715         if (inode)
 716                 iput(inode);
 717
 718         if (osb) {
 719                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 720                 wake_up(&osb->osb_mount_event);
 721                 ocfs2_dismount_volume(sb, 1);
 722         }
 723
 724         mlog_exit(status);
 725         return status;
 726 }
 727
 728 static int ocfs2_get_sb(struct file_system_type *fs_type,
 729                         int flags,
 730                         const char *dev_name,
 731                         void *data,
 732                         struct vfsmount *mnt)
 733 {
 734         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 735                            mnt);
 736 }
 737
 738 static struct file_system_type ocfs2_fs_type = {
 739         .owner          = THIS_MODULE,
 740         .name           = "ocfs2",
 741         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 742                                         * the fs? */
 743         .kill_sb        = kill_block_super, /* set to the generic one
 744                                              * right now, but do we
 745                                              * need to change that? */
 746         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 747         .next           = NULL
 748 };
 749
 750 static int ocfs2_parse_options(struct super_block *sb,
 751                                char *options,
 752                                struct mount_options *mopt,
 753                                int is_remount)
 754 {
 755         int status;
 756         char *p;
 757
 758         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 759                    options ? options : "(none)");
 760
 761         mopt->commit_interval = 0;
 762         mopt->mount_opt = 0;
 763         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 764         mopt->slot = OCFS2_INVALID_SLOT;
 765         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
 766
 767         if (!options) {
 768                 status = 1;
 769                 goto bail;
 770         }
 771
 772         while ((p = strsep(&options, ",")) != NULL) {
 773                 int token, option;
 774                 substring_t args[MAX_OPT_ARGS];
 775
 776                 if (!*p)
 777                         continue;
 778
 779                 token = match_token(p, tokens, args);
 780                 switch (token) {
 781                 case Opt_hb_local:
 782                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 783                         break;
 784                 case Opt_hb_none:
 785                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 786                         break;
 787                 case Opt_barrier:
 788                         if (match_int(&args[0], &option)) {
 789                                 status = 0;
 790                                 goto bail;
 791                         }
 792                         if (option)
 793                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
 794                         else
 795                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
 796                         break;
 797                 case Opt_intr:
 798                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
 799                         break;
 800                 case Opt_nointr:
 801                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
 802                         break;
 803                 case Opt_err_panic:
 804                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 805                         break;
 806                 case Opt_err_ro:
 807                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 808                         break;
 809                 case Opt_data_ordered:
 810                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 811                         break;
 812                 case Opt_data_writeback:
 813                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 814                         break;
 815                 case Opt_atime_quantum:
 816                         if (match_int(&args[0], &option)) {
 817                                 status = 0;
 818                                 goto bail;
 819                         }
 820                         if (option >= 0)
 821                                 mopt->atime_quantum = option;
 822                         break;
 823                 case Opt_slot:
 824                         option = 0;
 825                         if (match_int(&args[0], &option)) {
 826                                 status = 0;
 827                                 goto bail;
 828                         }
 829                         if (option)
 830                                 mopt->slot = (s16)option;
 831                         break;
 832                 case Opt_commit:
 833                         option = 0;
 834                         if (match_int(&args[0], &option)) {
 835                                 status = 0;
 836                                 goto bail;
 837                         }
 838                         if (option < 0)
 839                                 return 0;
 840                         if (option == 0)
 841                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 842                         mopt->commit_interval = HZ * option;
 843                         break;
 844                 case Opt_localalloc:
 845                         option = 0;
 846                         if (match_int(&args[0], &option)) {
 847                                 status = 0;
 848                                 goto bail;
 849                         }
 850                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
 851                                 mopt->localalloc_opt = option;
 852                         break;
 853                 case Opt_localflocks:
 854                         /*
 855                          * Changing this during remount could race
 856                          * flock() requests, or "unbalance" existing
 857                          * ones (e.g., a lock is taken in one mode but
 858                          * dropped in the other). If users care enough
 859                          * to flip locking modes during remount, we
 860                          * could add a "local" flag to individual
 861                          * flock structures for proper tracking of
 862                          * state.
 863                          */
 864                         if (!is_remount)
 865                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
 866                         break;
 867                 default:
 868                         mlog(ML_ERROR,
 869                              "Unrecognized mount option \"%s\" "
 870                              "or missing value\n", p);
 871                         status = 0;
 872                         goto bail;
 873                 }
 874         }
 875
 876         status = 1;
 877
 878 bail:
 879         mlog_exit(status);
 880         return status;
 881 }
 882
 883 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
 884 {
 885         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
 886         unsigned long opts = osb->s_mount_opt;
 887
 888         if (opts & OCFS2_MOUNT_HB_LOCAL)
 889                 seq_printf(s, ",_netdev,heartbeat=local");
 890         else
 891                 seq_printf(s, ",heartbeat=none");
 892
 893         if (opts & OCFS2_MOUNT_NOINTR)
 894                 seq_printf(s, ",nointr");
 895
 896         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
 897                 seq_printf(s, ",data=writeback");
 898         else
 899                 seq_printf(s, ",data=ordered");
 900
 901         if (opts & OCFS2_MOUNT_BARRIER)
 902                 seq_printf(s, ",barrier=1");
 903
 904         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
 905                 seq_printf(s, ",errors=panic");
 906         else
 907                 seq_printf(s, ",errors=remount-ro");
 908
 909         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
 910                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
 911
 912         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
 913                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
 914
 915         if (osb->osb_commit_interval)
 916                 seq_printf(s, ",commit=%u",
 917                            (unsigned) (osb->osb_commit_interval / HZ));
 918
 919         if (osb->local_alloc_size != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
 920                 seq_printf(s, ",localalloc=%d", osb->local_alloc_size);
 921
 922         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
 923                 seq_printf(s, ",localflocks,");
 924
 925         return 0;
 926 }
 927
 928 static int __init ocfs2_init(void)
 929 {
 930         int status;
 931
 932         mlog_entry_void();
 933
 934         ocfs2_print_version();
 935
 936         dlmglue_init_stack();
 937
 938         status = init_ocfs2_uptodate_cache();
 939         if (status < 0) {
 940                 mlog_errno(status);
 941                 goto leave;
 942         }
 943
 944         status = ocfs2_initialize_mem_caches();
 945         if (status < 0) {
 946                 mlog_errno(status);
 947                 goto leave;
 948         }
 949
 950         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
 951         if (!ocfs2_wq) {
 952                 status = -ENOMEM;
 953                 goto leave;
 954         }
 955
 956         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
 957         if (!ocfs2_debugfs_root) {
 958                 status = -EFAULT;
 959                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
 960         }
 961
 962 leave:
 963         if (status < 0) {
 964                 ocfs2_free_mem_caches();
 965                 exit_ocfs2_uptodate_cache();
 966         }
 967
 968         mlog_exit(status);
 969
 970         if (status >= 0) {
 971                 return register_filesystem(&ocfs2_fs_type);
 972         } else
 973                 return -1;
 974 }
 975
 976 static void __exit ocfs2_exit(void)
 977 {
 978         mlog_entry_void();
 979
 980         if (ocfs2_wq) {
 981                 flush_workqueue(ocfs2_wq);
 982                 destroy_workqueue(ocfs2_wq);
 983         }
 984
 985         debugfs_remove(ocfs2_debugfs_root);
 986
 987         ocfs2_free_mem_caches();
 988
 989         unregister_filesystem(&ocfs2_fs_type);
 990
 991         exit_ocfs2_uptodate_cache();
 992
 993         dlmglue_exit_stack();
 994
 995         mlog_exit_void();
 996 }
 997
 998 static void ocfs2_put_super(struct super_block *sb)
 999 {
1000         mlog_entry("(0x%p)\n", sb);
1001
1002         ocfs2_sync_blockdev(sb);
1003         ocfs2_dismount_volume(sb, 0);
1004
1005         mlog_exit_void();
1006 }
1007
1008 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1009 {
1010         struct ocfs2_super *osb;
1011         u32 numbits, freebits;
1012         int status;
1013         struct ocfs2_dinode *bm_lock;
1014         struct buffer_head *bh = NULL;
1015         struct inode *inode = NULL;
1016
1017         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1018
1019         osb = OCFS2_SB(dentry->d_sb);
1020
1021         inode = ocfs2_get_system_file_inode(osb,
1022                                             GLOBAL_BITMAP_SYSTEM_INODE,
1023                                             OCFS2_INVALID_SLOT);
1024         if (!inode) {
1025                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1026                 status = -EIO;
1027                 goto bail;
1028         }
1029
1030         status = ocfs2_inode_lock(inode, &bh, 0);
1031         if (status < 0) {
1032                 mlog_errno(status);
1033                 goto bail;
1034         }
1035
1036         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1037
1038         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1039         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1040
1041         buf->f_type = OCFS2_SUPER_MAGIC;
1042         buf->f_bsize = dentry->d_sb->s_blocksize;
1043         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1044         buf->f_blocks = ((sector_t) numbits) *
1045                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1046         buf->f_bfree = ((sector_t) freebits) *
1047                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1048         buf->f_bavail = buf->f_bfree;
1049         buf->f_files = numbits;
1050         buf->f_ffree = freebits;
1051
1052         brelse(bh);
1053
1054         ocfs2_inode_unlock(inode, 0);
1055         status = 0;
1056 bail:
1057         if (inode)
1058                 iput(inode);
1059
1060         mlog_exit(status);
1061
1062         return status;
1063 }
1064
1065 static void ocfs2_inode_init_once(struct kmem_cache *cachep, void *data)
1066 {
1067         struct ocfs2_inode_info *oi = data;
1068
1069         oi->ip_flags = 0;
1070         oi->ip_open_count = 0;
1071         spin_lock_init(&oi->ip_lock);
1072         ocfs2_extent_map_init(&oi->vfs_inode);
1073         INIT_LIST_HEAD(&oi->ip_io_markers);
1074         oi->ip_created_trans = 0;
1075         oi->ip_last_trans = 0;
1076         oi->ip_dir_start_lookup = 0;
1077
1078         init_rwsem(&oi->ip_alloc_sem);
1079         mutex_init(&oi->ip_io_mutex);
1080
1081         oi->ip_blkno = 0ULL;
1082         oi->ip_clusters = 0;
1083
1084         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1085         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1086         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1087
1088         ocfs2_metadata_cache_init(&oi->vfs_inode);
1089
1090         inode_init_once(&oi->vfs_inode);
1091 }
1092
1093 static int ocfs2_initialize_mem_caches(void)
1094 {
1095         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1096                                        sizeof(struct ocfs2_inode_info),
1097                                        0,
1098                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1099                                                 SLAB_MEM_SPREAD),
1100                                        ocfs2_inode_init_once);
1101         if (!ocfs2_inode_cachep)
1102                 return -ENOMEM;
1103
1104         return 0;
1105 }
1106
1107 static void ocfs2_free_mem_caches(void)
1108 {
1109         if (ocfs2_inode_cachep)
1110                 kmem_cache_destroy(ocfs2_inode_cachep);
1111
1112         ocfs2_inode_cachep = NULL;
1113 }
1114
1115 static int ocfs2_get_sector(struct super_block *sb,
1116                             struct buffer_head **bh,
1117                             int block,
1118                             int sect_size)
1119 {
1120         if (!sb_set_blocksize(sb, sect_size)) {
1121                 mlog(ML_ERROR, "unable to set blocksize\n");
1122                 return -EIO;
1123         }
1124
1125         *bh = sb_getblk(sb, block);
1126         if (!*bh) {
1127                 mlog_errno(-EIO);
1128                 return -EIO;
1129         }
1130         lock_buffer(*bh);
1131         if (!buffer_dirty(*bh))
1132                 clear_buffer_uptodate(*bh);
1133         unlock_buffer(*bh);
1134         ll_rw_block(READ, 1, bh);
1135         wait_on_buffer(*bh);
1136         return 0;
1137 }
1138
1139 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1140 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1141 {
1142         int status;
1143
1144         /* XXX hold a ref on the node while mounte?  easy enough, if
1145          * desirable. */
1146         if (ocfs2_mount_local(osb))
1147                 osb->node_num = 0;
1148         else
1149                 osb->node_num = o2nm_this_node();
1150
1151         if (osb->node_num == O2NM_MAX_NODES) {
1152                 mlog(ML_ERROR, "could not find this host's node number\n");
1153                 status = -ENOENT;
1154                 goto bail;
1155         }
1156
1157         mlog(0, "I am node %d\n", osb->node_num);
1158
1159         status = 0;
1160 bail:
1161         return status;
1162 }
1163
1164 static int ocfs2_mount_volume(struct super_block *sb)
1165 {
1166         int status = 0;
1167         int unlock_super = 0;
1168         struct ocfs2_super *osb = OCFS2_SB(sb);
1169
1170         mlog_entry_void();
1171
1172         if (ocfs2_is_hard_readonly(osb))
1173                 goto leave;
1174
1175         status = ocfs2_fill_local_node_info(osb);
1176         if (status < 0) {
1177                 mlog_errno(status);
1178                 goto leave;
1179         }
1180
1181         status = ocfs2_dlm_init(osb);
1182         if (status < 0) {
1183                 mlog_errno(status);
1184                 goto leave;
1185         }
1186
1187         status = ocfs2_super_lock(osb, 1);
1188         if (status < 0) {
1189                 mlog_errno(status);
1190                 goto leave;
1191         }
1192         unlock_super = 1;
1193
1194         /* This will load up the node map and add ourselves to it. */
1195         status = ocfs2_find_slot(osb);
1196         if (status < 0) {
1197                 mlog_errno(status);
1198                 goto leave;
1199         }
1200
1201         /* load all node-local system inodes */
1202         status = ocfs2_init_local_system_inodes(osb);
1203         if (status < 0) {
1204                 mlog_errno(status);
1205                 goto leave;
1206         }
1207
1208         status = ocfs2_check_volume(osb);
1209         if (status < 0) {
1210                 mlog_errno(status);
1211                 goto leave;
1212         }
1213
1214         status = ocfs2_truncate_log_init(osb);
1215         if (status < 0) {
1216                 mlog_errno(status);
1217                 goto leave;
1218         }
1219
1220         if (ocfs2_mount_local(osb))
1221                 goto leave;
1222
1223 leave:
1224         if (unlock_super)
1225                 ocfs2_super_unlock(osb, 1);
1226
1227         mlog_exit(status);
1228         return status;
1229 }
1230
1231 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1232 {
1233         int tmp;
1234         struct ocfs2_super *osb = NULL;
1235         char nodestr[8];
1236
1237         mlog_entry("(0x%p)\n", sb);
1238
1239         BUG_ON(!sb);
1240         osb = OCFS2_SB(sb);
1241         BUG_ON(!osb);
1242
1243         ocfs2_shutdown_local_alloc(osb);
1244
1245         ocfs2_truncate_log_shutdown(osb);
1246
1247         /* This will disable recovery and flush any recovery work. */
1248         ocfs2_recovery_exit(osb);
1249
1250         ocfs2_journal_shutdown(osb);
1251
1252         ocfs2_sync_blockdev(sb);
1253
1254         /* No dlm means we've failed during mount, so skip all the
1255          * steps which depended on that to complete. */
1256         if (osb->dlm) {
1257                 tmp = ocfs2_super_lock(osb, 1);
1258                 if (tmp < 0) {
1259                         mlog_errno(tmp);
1260                         return;
1261                 }
1262         }
1263
1264         if (osb->slot_num != OCFS2_INVALID_SLOT)
1265                 ocfs2_put_slot(osb);
1266
1267         if (osb->dlm)
1268                 ocfs2_super_unlock(osb, 1);
1269
1270         ocfs2_release_system_inodes(osb);
1271
1272         if (osb->dlm)
1273                 ocfs2_dlm_shutdown(osb);
1274
1275         debugfs_remove(osb->osb_debug_root);
1276
1277         if (!mnt_err)
1278                 ocfs2_stop_heartbeat(osb);
1279
1280         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1281
1282         if (ocfs2_mount_local(osb))
1283                 snprintf(nodestr, sizeof(nodestr), "local");
1284         else
1285                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1286
1287         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1288                osb->dev_str, nodestr);
1289
1290         ocfs2_delete_osb(osb);
1291         kfree(osb);
1292         sb->s_dev = 0;
1293         sb->s_fs_info = NULL;
1294 }
1295
1296 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1297                                 unsigned uuid_bytes)
1298 {
1299         int i, ret;
1300         char *ptr;
1301
1302         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1303
1304         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1305         if (osb->uuid_str == NULL)
1306                 return -ENOMEM;
1307
1308         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1309                 /* print with null */
1310                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1311                 if (ret != 2) /* drop super cleans up */
1312                         return -EINVAL;
1313                 /* then only advance past the last char */
1314                 ptr += 2;
1315         }
1316
1317         return 0;
1318 }
1319
1320 static int ocfs2_initialize_super(struct super_block *sb,
1321                                   struct buffer_head *bh,
1322                                   int sector_size)
1323 {
1324         int status;
1325         int i, cbits, bbits;
1326         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1327         struct inode *inode = NULL;
1328         struct ocfs2_journal *journal;
1329         __le32 uuid_net_key;
1330         struct ocfs2_super *osb;
1331
1332         mlog_entry_void();
1333
1334         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1335         if (!osb) {
1336                 status = -ENOMEM;
1337                 mlog_errno(status);
1338                 goto bail;
1339         }
1340
1341         sb->s_fs_info = osb;
1342         sb->s_op = &ocfs2_sops;
1343         sb->s_export_op = &ocfs2_export_ops;
1344         osb->osb_locking_proto = ocfs2_locking_protocol;
1345         sb->s_time_gran = 1;
1346         sb->s_flags |= MS_NOATIME;
1347         /* this is needed to support O_LARGEFILE */
1348         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1349         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1350         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1351
1352         osb->sb = sb;
1353         /* Save off for ocfs2_rw_direct */
1354         osb->s_sectsize_bits = blksize_bits(sector_size);
1355         BUG_ON(!osb->s_sectsize_bits);
1356
1357         spin_lock_init(&osb->dc_task_lock);
1358         init_waitqueue_head(&osb->dc_event);
1359         osb->dc_work_sequence = 0;
1360         osb->dc_wake_sequence = 0;
1361         INIT_LIST_HEAD(&osb->blocked_lock_list);
1362         osb->blocked_lock_count = 0;
1363         spin_lock_init(&osb->osb_lock);
1364
1365         atomic_set(&osb->alloc_stats.moves, 0);
1366         atomic_set(&osb->alloc_stats.local_data, 0);
1367         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1368         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1369         atomic_set(&osb->alloc_stats.bg_extends, 0);
1370
1371         ocfs2_init_node_maps(osb);
1372
1373         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1374                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1375
1376         status = ocfs2_recovery_init(osb);
1377         if (status) {
1378                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1379                 mlog_errno(status);
1380                 goto bail;
1381         }
1382
1383         init_waitqueue_head(&osb->checkpoint_event);
1384         atomic_set(&osb->needs_checkpoint, 0);
1385
1386         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1387
1388         osb->node_num = O2NM_INVALID_NODE_NUM;
1389         osb->slot_num = OCFS2_INVALID_SLOT;
1390
1391         osb->local_alloc_state = OCFS2_LA_UNUSED;
1392         osb->local_alloc_bh = NULL;
1393
1394         ocfs2_setup_hb_callbacks(osb);
1395
1396         init_waitqueue_head(&osb->osb_mount_event);
1397
1398         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1399         if (!osb->vol_label) {
1400                 mlog(ML_ERROR, "unable to alloc vol label\n");
1401                 status = -ENOMEM;
1402                 goto bail;
1403         }
1404
1405         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1406         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1407                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1408                      osb->max_slots);
1409                 status = -EINVAL;
1410                 goto bail;
1411         }
1412         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1413
1414         init_waitqueue_head(&osb->osb_wipe_event);
1415         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1416                                         sizeof(*osb->osb_orphan_wipes),
1417                                         GFP_KERNEL);
1418         if (!osb->osb_orphan_wipes) {
1419                 status = -ENOMEM;
1420                 mlog_errno(status);
1421                 goto bail;
1422         }
1423
1424         osb->s_feature_compat =
1425                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1426         osb->s_feature_ro_compat =
1427                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1428         osb->s_feature_incompat =
1429                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1430
1431         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1432                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1433                      "optional features (%x).\n", i);
1434                 status = -EINVAL;
1435                 goto bail;
1436         }
1437         if (!(osb->sb->s_flags & MS_RDONLY) &&
1438             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1439                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1440                      "unsupported optional features (%x).\n", i);
1441                 status = -EINVAL;
1442                 goto bail;
1443         }
1444
1445         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1446
1447         /* FIXME
1448          * This should be done in ocfs2_journal_init(), but unknown
1449          * ordering issues will cause the filesystem to crash.
1450          * If anyone wants to figure out what part of the code
1451          * refers to osb->journal before ocfs2_journal_init() is run,
1452          * be my guest.
1453          */
1454         /* initialize our journal structure */
1455
1456         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1457         if (!journal) {
1458                 mlog(ML_ERROR, "unable to alloc journal\n");
1459                 status = -ENOMEM;
1460                 goto bail;
1461         }
1462         osb->journal = journal;
1463         journal->j_osb = osb;
1464
1465         atomic_set(&journal->j_num_trans, 0);
1466         init_rwsem(&journal->j_trans_barrier);
1467         init_waitqueue_head(&journal->j_checkpointed);
1468         spin_lock_init(&journal->j_lock);
1469         journal->j_trans_id = (unsigned long) 1;
1470         INIT_LIST_HEAD(&journal->j_la_cleanups);
1471         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1472         journal->j_state = OCFS2_JOURNAL_FREE;
1473
1474         /* get some pseudo constants for clustersize bits */
1475         osb->s_clustersize_bits =
1476                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1477         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1478         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1479
1480         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1481             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1482                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1483                      osb->s_clustersize);
1484                 status = -EINVAL;
1485                 goto bail;
1486         }
1487
1488         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1489             > (u32)~0UL) {
1490                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1491                      "what jbd can address in 32 bits.\n");
1492                 status = -EINVAL;
1493                 goto bail;
1494         }
1495
1496         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1497                                  sizeof(di->id2.i_super.s_uuid))) {
1498                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1499                 status = -ENOMEM;
1500                 goto bail;
1501         }
1502
1503         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1504
1505         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1506         osb->vol_label[63] = '\0';
1507         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1508         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1509         osb->first_cluster_group_blkno =
1510                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1511         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1512         mlog(0, "vol_label: %s\n", osb->vol_label);
1513         mlog(0, "uuid: %s\n", osb->uuid_str);
1514         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1515              (unsigned long long)osb->root_blkno,
1516              (unsigned long long)osb->system_dir_blkno);
1517
1518         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1519         if (!osb->osb_dlm_debug) {
1520                 status = -ENOMEM;
1521                 mlog_errno(status);
1522                 goto bail;
1523         }
1524
1525         atomic_set(&osb->vol_state, VOLUME_INIT);
1526
1527         /* load root, system_dir, and all global system inodes */
1528         status = ocfs2_init_global_system_inodes(osb);
1529         if (status < 0) {
1530                 mlog_errno(status);
1531                 goto bail;
1532         }
1533
1534         /*
1535          * global bitmap
1536          */
1537         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1538                                             OCFS2_INVALID_SLOT);
1539         if (!inode) {
1540                 status = -EINVAL;
1541                 mlog_errno(status);
1542                 goto bail;
1543         }
1544
1545         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1546         iput(inode);
1547
1548         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1549
1550         status = ocfs2_init_slot_info(osb);
1551         if (status < 0) {
1552                 mlog_errno(status);
1553                 goto bail;
1554         }
1555
1556 bail:
1557         mlog_exit(status);
1558         return status;
1559 }
1560
1561 /*
1562  * will return: -EAGAIN if it is ok to keep searching for superblocks
1563  *              -EINVAL if there is a bad superblock
1564  *              0 on success
1565  */
1566 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1567                                struct buffer_head *bh,
1568                                u32 blksz)
1569 {
1570         int status = -EAGAIN;
1571
1572         mlog_entry_void();
1573
1574         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1575                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1576                 status = -EINVAL;
1577                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1578                         mlog(ML_ERROR, "found superblock with incorrect block "
1579                              "size: found %u, should be %u\n",
1580                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1581                                blksz);
1582                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1583                            OCFS2_MAJOR_REV_LEVEL ||
1584                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1585                            OCFS2_MINOR_REV_LEVEL) {
1586                         mlog(ML_ERROR, "found superblock with bad version: "
1587                              "found %u.%u, should be %u.%u\n",
1588                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1589                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1590                              OCFS2_MAJOR_REV_LEVEL,
1591                              OCFS2_MINOR_REV_LEVEL);
1592                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1593                         mlog(ML_ERROR, "bad block number on superblock: "
1594                              "found %llu, should be %llu\n",
1595                              (unsigned long long)le64_to_cpu(di->i_blkno),
1596                              (unsigned long long)bh->b_blocknr);
1597                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1598                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1599                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1600                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1601                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1602                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1603                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1604                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1605                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1606                         mlog(ML_ERROR,
1607                              "Superblock slots found greater than file system "
1608                              "maximum: found %u, max %u\n",
1609                              le16_to_cpu(di->id2.i_super.s_max_slots),
1610                              OCFS2_MAX_SLOTS);
1611                 } else {
1612                         /* found it! */
1613                         status = 0;
1614                 }
1615         }
1616
1617         mlog_exit(status);
1618         return status;
1619 }
1620
1621 static int ocfs2_check_volume(struct ocfs2_super *osb)
1622 {
1623         int status;
1624         int dirty;
1625         int local;
1626         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1627                                                   * recover
1628                                                   * ourselves. */
1629
1630         mlog_entry_void();
1631
1632         /* Init our journal object. */
1633         status = ocfs2_journal_init(osb->journal, &dirty);
1634         if (status < 0) {
1635                 mlog(ML_ERROR, "Could not initialize journal!\n");
1636                 goto finally;
1637         }
1638
1639         /* If the journal was unmounted cleanly then we don't want to
1640          * recover anything. Otherwise, journal_load will do that
1641          * dirty work for us :) */
1642         if (!dirty) {
1643                 status = ocfs2_journal_wipe(osb->journal, 0);
1644                 if (status < 0) {
1645                         mlog_errno(status);
1646                         goto finally;
1647                 }
1648         } else {
1649                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1650                      "recovering volume.\n");
1651         }
1652
1653         local = ocfs2_mount_local(osb);
1654
1655         /* will play back anything left in the journal. */
1656         ocfs2_journal_load(osb->journal, local);
1657
1658         if (dirty) {
1659                 /* recover my local alloc if we didn't unmount cleanly. */
1660                 status = ocfs2_begin_local_alloc_recovery(osb,
1661                                                           osb->slot_num,
1662                                                           &local_alloc);
1663                 if (status < 0) {
1664                         mlog_errno(status);
1665                         goto finally;
1666                 }
1667                 /* we complete the recovery process after we've marked
1668                  * ourselves as mounted. */
1669         }
1670
1671         mlog(0, "Journal loaded.\n");
1672
1673         status = ocfs2_load_local_alloc(osb);
1674         if (status < 0) {
1675                 mlog_errno(status);
1676                 goto finally;
1677         }
1678
1679         if (dirty) {
1680                 /* Recovery will be completed after we've mounted the
1681                  * rest of the volume. */
1682                 osb->dirty = 1;
1683                 osb->local_alloc_copy = local_alloc;
1684                 local_alloc = NULL;
1685         }
1686
1687         /* go through each journal, trylock it and if you get the
1688          * lock, and it's marked as dirty, set the bit in the recover
1689          * map and launch a recovery thread for it. */
1690         status = ocfs2_mark_dead_nodes(osb);
1691         if (status < 0)
1692                 mlog_errno(status);
1693
1694 finally:
1695         if (local_alloc)
1696                 kfree(local_alloc);
1697
1698         mlog_exit(status);
1699         return status;
1700 }
1701
1702 /*
1703  * The routine gets called from dismount or close whenever a dismount on
1704  * volume is requested and the osb open count becomes 1.
1705  * It will remove the osb from the global list and also free up all the
1706  * initialized resources and fileobject.
1707  */
1708 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1709 {
1710         mlog_entry_void();
1711
1712         /* This function assumes that the caller has the main osb resource */
1713
1714         ocfs2_free_slot_info(osb);
1715
1716         kfree(osb->osb_orphan_wipes);
1717         /* FIXME
1718          * This belongs in journal shutdown, but because we have to
1719          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1720          * we free it here.
1721          */
1722         kfree(osb->journal);
1723         if (osb->local_alloc_copy)
1724                 kfree(osb->local_alloc_copy);
1725         kfree(osb->uuid_str);
1726         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1727         memset(osb, 0, sizeof(struct ocfs2_super));
1728
1729         mlog_exit_void();
1730 }
1731
1732 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1733  * panic(). We do not support continue-on-error operation. */
1734 static void ocfs2_handle_error(struct super_block *sb)
1735 {
1736         struct ocfs2_super *osb = OCFS2_SB(sb);
1737
1738         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1739                 panic("OCFS2: (device %s): panic forced after error\n",
1740                       sb->s_id);
1741
1742         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1743
1744         if (sb->s_flags & MS_RDONLY &&
1745             (ocfs2_is_soft_readonly(osb) ||
1746              ocfs2_is_hard_readonly(osb)))
1747                 return;
1748
1749         printk(KERN_CRIT "File system is now read-only due to the potential "
1750                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1751                "system is unmounted.\n");
1752         sb->s_flags |= MS_RDONLY;
1753         ocfs2_set_ro_flag(osb, 0);
1754 }
1755
1756 static char error_buf[1024];
1757
1758 void __ocfs2_error(struct super_block *sb,
1759                    const char *function,
1760                    const char *fmt, ...)
1761 {
1762         va_list args;
1763
1764         va_start(args, fmt);
1765         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1766         va_end(args);
1767
1768         /* Not using mlog here because we want to show the actual
1769          * function the error came from. */
1770         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1771                sb->s_id, function, error_buf);
1772
1773         ocfs2_handle_error(sb);
1774 }
1775
1776 /* Handle critical errors. This is intentionally more drastic than
1777  * ocfs2_handle_error, so we only use for things like journal errors,
1778  * etc. */
1779 void __ocfs2_abort(struct super_block* sb,
1780                    const char *function,
1781                    const char *fmt, ...)
1782 {
1783         va_list args;
1784
1785         va_start(args, fmt);
1786         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1787         va_end(args);
1788
1789         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1790                sb->s_id, function, error_buf);
1791
1792         /* We don't have the cluster support yet to go straight to
1793          * hard readonly in here. Until then, we want to keep
1794          * ocfs2_abort() so that we can at least mark critical
1795          * errors.
1796          *
1797          * TODO: This should abort the journal and alert other nodes
1798          * that our slot needs recovery. */
1799
1800         /* Force a panic(). This stinks, but it's better than letting
1801          * things continue without having a proper hard readonly
1802          * here. */
1803         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1804         ocfs2_handle_error(sb);
1805 }
1806
1807 module_init(ocfs2_init);
1808 module_exit(ocfs2_exit);