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, s16 *slot,
  86                                int is_remount);
  87 static void ocfs2_put_super(struct super_block *sb);
  88 static int ocfs2_mount_volume(struct super_block *sb);
  89 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
  90 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
  91 static int ocfs2_initialize_mem_caches(void);
  92 static void ocfs2_free_mem_caches(void);
  93 static void ocfs2_delete_osb(struct ocfs2_super *osb);
  94
  95 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
  96
  97 static int ocfs2_sync_fs(struct super_block *sb, int wait);
  98
  99 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 100 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 101 static int ocfs2_release_system_inodes(struct ocfs2_super *osb);
 102 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
 103 static int ocfs2_check_volume(struct ocfs2_super *osb);
 104 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 105                                struct buffer_head *bh,
 106                                u32 sectsize);
 107 static int ocfs2_initialize_super(struct super_block *sb,
 108                                   struct buffer_head *bh,
 109                                   int sector_size);
 110 static int ocfs2_get_sector(struct super_block *sb,
 111                             struct buffer_head **bh,
 112                             int block,
 113                             int sect_size);
 114 static void ocfs2_write_super(struct super_block *sb);
 115 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 116 static void ocfs2_destroy_inode(struct inode *inode);
 117
 118 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift);
 119
 120 static const struct super_operations ocfs2_sops = {
 121         .statfs         = ocfs2_statfs,
 122         .alloc_inode    = ocfs2_alloc_inode,
 123         .destroy_inode  = ocfs2_destroy_inode,
 124         .drop_inode     = ocfs2_drop_inode,
 125         .clear_inode    = ocfs2_clear_inode,
 126         .delete_inode   = ocfs2_delete_inode,
 127         .sync_fs        = ocfs2_sync_fs,
 128         .write_super    = ocfs2_write_super,
 129         .put_super      = ocfs2_put_super,
 130         .remount_fs     = ocfs2_remount,
 131 };
 132
 133 enum {
 134         Opt_barrier,
 135         Opt_err_panic,
 136         Opt_err_ro,
 137         Opt_intr,
 138         Opt_nointr,
 139         Opt_hb_none,
 140         Opt_hb_local,
 141         Opt_data_ordered,
 142         Opt_data_writeback,
 143         Opt_atime_quantum,
 144         Opt_slot,
 145         Opt_err,
 146 };
 147
 148 static match_table_t tokens = {
 149         {Opt_barrier, "barrier=%u"},
 150         {Opt_err_panic, "errors=panic"},
 151         {Opt_err_ro, "errors=remount-ro"},
 152         {Opt_intr, "intr"},
 153         {Opt_nointr, "nointr"},
 154         {Opt_hb_none, OCFS2_HB_NONE},
 155         {Opt_hb_local, OCFS2_HB_LOCAL},
 156         {Opt_data_ordered, "data=ordered"},
 157         {Opt_data_writeback, "data=writeback"},
 158         {Opt_atime_quantum, "atime_quantum=%u"},
 159         {Opt_slot, "preferred_slot=%u"},
 160         {Opt_err, NULL}
 161 };
 162
 163 /*
 164  * write_super and sync_fs ripped right out of ext3.
 165  */
 166 static void ocfs2_write_super(struct super_block *sb)
 167 {
 168         if (mutex_trylock(&sb->s_lock) != 0)
 169                 BUG();
 170         sb->s_dirt = 0;
 171 }
 172
 173 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 174 {
 175         int status = 0;
 176         tid_t target;
 177         struct ocfs2_super *osb = OCFS2_SB(sb);
 178
 179         sb->s_dirt = 0;
 180
 181         if (ocfs2_is_hard_readonly(osb))
 182                 return -EROFS;
 183
 184         if (wait) {
 185                 status = ocfs2_flush_truncate_log(osb);
 186                 if (status < 0)
 187                         mlog_errno(status);
 188         } else {
 189                 ocfs2_schedule_truncate_log_flush(osb, 0);
 190         }
 191
 192         if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
 193                 if (wait)
 194                         log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 195                                         target);
 196         }
 197         return 0;
 198 }
 199
 200 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 201 {
 202         struct inode *new = NULL;
 203         int status = 0;
 204         int i;
 205
 206         mlog_entry_void();
 207
 208         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
 209         if (IS_ERR(new)) {
 210                 status = PTR_ERR(new);
 211                 mlog_errno(status);
 212                 goto bail;
 213         }
 214         osb->root_inode = new;
 215
 216         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
 217         if (IS_ERR(new)) {
 218                 status = PTR_ERR(new);
 219                 mlog_errno(status);
 220                 goto bail;
 221         }
 222         osb->sys_root_inode = new;
 223
 224         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 225              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 226                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 227                 if (!new) {
 228                         ocfs2_release_system_inodes(osb);
 229                         status = -EINVAL;
 230                         mlog_errno(status);
 231                         /* FIXME: Should ERROR_RO_FS */
 232                         mlog(ML_ERROR, "Unable to load system inode %d, "
 233                              "possibly corrupt fs?", i);
 234                         goto bail;
 235                 }
 236                 // the array now has one ref, so drop this one
 237                 iput(new);
 238         }
 239
 240 bail:
 241         mlog_exit(status);
 242         return status;
 243 }
 244
 245 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 246 {
 247         struct inode *new = NULL;
 248         int status = 0;
 249         int i;
 250
 251         mlog_entry_void();
 252
 253         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 254              i < NUM_SYSTEM_INODES;
 255              i++) {
 256                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 257                 if (!new) {
 258                         ocfs2_release_system_inodes(osb);
 259                         status = -EINVAL;
 260                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 261                              status, i, osb->slot_num);
 262                         goto bail;
 263                 }
 264                 /* the array now has one ref, so drop this one */
 265                 iput(new);
 266         }
 267
 268 bail:
 269         mlog_exit(status);
 270         return status;
 271 }
 272
 273 static int ocfs2_release_system_inodes(struct ocfs2_super *osb)
 274 {
 275         int status = 0, i;
 276         struct inode *inode;
 277
 278         mlog_entry_void();
 279
 280         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 281                 inode = osb->system_inodes[i];
 282                 if (inode) {
 283                         iput(inode);
 284                         osb->system_inodes[i] = NULL;
 285                 }
 286         }
 287
 288         inode = osb->sys_root_inode;
 289         if (inode) {
 290                 iput(inode);
 291                 osb->sys_root_inode = NULL;
 292         }
 293
 294         inode = osb->root_inode;
 295         if (inode) {
 296                 iput(inode);
 297                 osb->root_inode = NULL;
 298         }
 299
 300         mlog_exit(status);
 301         return status;
 302 }
 303
 304 /* We're allocating fs objects, use GFP_NOFS */
 305 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 306 {
 307         struct ocfs2_inode_info *oi;
 308
 309         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 310         if (!oi)
 311                 return NULL;
 312
 313         return &oi->vfs_inode;
 314 }
 315
 316 static void ocfs2_destroy_inode(struct inode *inode)
 317 {
 318         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 319 }
 320
 321 /* From xfs_super.c:xfs_max_file_offset
 322  * Copyright (c) 2000-2004 Silicon Graphics, Inc.
 323  */
 324 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift)
 325 {
 326         unsigned int pagefactor = 1;
 327         unsigned int bitshift = BITS_PER_LONG - 1;
 328
 329         /* Figure out maximum filesize, on Linux this can depend on
 330          * the filesystem blocksize (on 32 bit platforms).
 331          * __block_prepare_write does this in an [unsigned] long...
 332          *      page->index << (PAGE_CACHE_SHIFT - bbits)
 333          * So, for page sized blocks (4K on 32 bit platforms),
 334          * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
 335          *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
 336          * but for smaller blocksizes it is less (bbits = log2 bsize).
 337          * Note1: get_block_t takes a long (implicit cast from above)
 338          * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
 339          * can optionally convert the [unsigned] long from above into
 340          * an [unsigned] long long.
 341          */
 342
 343 #if BITS_PER_LONG == 32
 344 # if defined(CONFIG_LBD)
 345         BUILD_BUG_ON(sizeof(sector_t) != 8);
 346         pagefactor = PAGE_CACHE_SIZE;
 347         bitshift = BITS_PER_LONG;
 348 # else
 349         pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
 350 # endif
 351 #endif
 352
 353         return (((unsigned long long)pagefactor) << bitshift) - 1;
 354 }
 355
 356 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 357 {
 358         int incompat_features;
 359         int ret = 0;
 360         unsigned long parsed_options;
 361         s16 slot;
 362         struct ocfs2_super *osb = OCFS2_SB(sb);
 363
 364         if (!ocfs2_parse_options(sb, data, &parsed_options, &slot, 1)) {
 365                 ret = -EINVAL;
 366                 goto out;
 367         }
 368
 369         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 370             (parsed_options & OCFS2_MOUNT_HB_LOCAL)) {
 371                 ret = -EINVAL;
 372                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 373                 goto out;
 374         }
 375
 376         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 377             (parsed_options & OCFS2_MOUNT_DATA_WRITEBACK)) {
 378                 ret = -EINVAL;
 379                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 380                 goto out;
 381         }
 382
 383         /* We're going to/from readonly mode. */
 384         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 385                 /* Lock here so the check of HARD_RO and the potential
 386                  * setting of SOFT_RO is atomic. */
 387                 spin_lock(&osb->osb_lock);
 388                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 389                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 390                         ret = -EROFS;
 391                         goto unlock_osb;
 392                 }
 393
 394                 if (*flags & MS_RDONLY) {
 395                         mlog(0, "Going to ro mode.\n");
 396                         sb->s_flags |= MS_RDONLY;
 397                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 398                 } else {
 399                         mlog(0, "Making ro filesystem writeable.\n");
 400
 401                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 402                                 mlog(ML_ERROR, "Cannot remount RDWR "
 403                                      "filesystem due to previous errors.\n");
 404                                 ret = -EROFS;
 405                                 goto unlock_osb;
 406                         }
 407                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 408                         if (incompat_features) {
 409                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 410                                      "of unsupported optional features "
 411                                      "(%x).\n", incompat_features);
 412                                 ret = -EINVAL;
 413                                 goto unlock_osb;
 414                         }
 415                         sb->s_flags &= ~MS_RDONLY;
 416                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 417                 }
 418 unlock_osb:
 419                 spin_unlock(&osb->osb_lock);
 420         }
 421
 422         if (!ret) {
 423                 if (!ocfs2_is_hard_readonly(osb))
 424                         ocfs2_set_journal_params(osb);
 425
 426                 /* Only save off the new mount options in case of a successful
 427                  * remount. */
 428                 osb->s_mount_opt = parsed_options;
 429         }
 430 out:
 431         return ret;
 432 }
 433
 434 static int ocfs2_sb_probe(struct super_block *sb,
 435                           struct buffer_head **bh,
 436                           int *sector_size)
 437 {
 438         int status = 0, tmpstat;
 439         struct ocfs1_vol_disk_hdr *hdr;
 440         struct ocfs2_dinode *di;
 441         int blksize;
 442
 443         *bh = NULL;
 444
 445         /* may be > 512 */
 446         *sector_size = bdev_hardsect_size(sb->s_bdev);
 447         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 448                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 449                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 450                 status = -EINVAL;
 451                 goto bail;
 452         }
 453
 454         /* Can this really happen? */
 455         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 456                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 457
 458         /* check block zero for old format */
 459         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 460         if (status < 0) {
 461                 mlog_errno(status);
 462                 goto bail;
 463         }
 464         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 465         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 466                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 467                      hdr->major_version, hdr->minor_version);
 468                 status = -EINVAL;
 469         }
 470         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 471                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 472                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 473                      hdr->signature);
 474                 status = -EINVAL;
 475         }
 476         brelse(*bh);
 477         *bh = NULL;
 478         if (status < 0) {
 479                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 480                      "upgraded before mounting with ocfs v2\n");
 481                 goto bail;
 482         }
 483
 484         /*
 485          * Now check at magic offset for 512, 1024, 2048, 4096
 486          * blocksizes.  4096 is the maximum blocksize because it is
 487          * the minimum clustersize.
 488          */
 489         status = -EINVAL;
 490         for (blksize = *sector_size;
 491              blksize <= OCFS2_MAX_BLOCKSIZE;
 492              blksize <<= 1) {
 493                 tmpstat = ocfs2_get_sector(sb, bh,
 494                                            OCFS2_SUPER_BLOCK_BLKNO,
 495                                            blksize);
 496                 if (tmpstat < 0) {
 497                         status = tmpstat;
 498                         mlog_errno(status);
 499                         goto bail;
 500                 }
 501                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 502                 status = ocfs2_verify_volume(di, *bh, blksize);
 503                 if (status >= 0)
 504                         goto bail;
 505                 brelse(*bh);
 506                 *bh = NULL;
 507                 if (status != -EAGAIN)
 508                         break;
 509         }
 510
 511 bail:
 512         return status;
 513 }
 514
 515 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 516 {
 517         if (ocfs2_mount_local(osb)) {
 518                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 519                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 520                              "mounted device.\n");
 521                         return -EINVAL;
 522                 }
 523         }
 524
 525         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 526                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
 527                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 528                              "a read-write clustered device.\n");
 529                         return -EINVAL;
 530                 }
 531         }
 532
 533         return 0;
 534 }
 535
 536 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 537 {
 538         struct dentry *root;
 539         int status, sector_size;
 540         unsigned long parsed_opt;
 541         s16 slot;
 542         struct inode *inode = NULL;
 543         struct ocfs2_super *osb = NULL;
 544         struct buffer_head *bh = NULL;
 545         char nodestr[8];
 546
 547         mlog_entry("%p, %p, %i", sb, data, silent);
 548
 549         if (!ocfs2_parse_options(sb, data, &parsed_opt, &slot, 0)) {
 550                 status = -EINVAL;
 551                 goto read_super_error;
 552         }
 553
 554         /* for now we only have one cluster/node, make sure we see it
 555          * in the heartbeat universe */
 556         if (parsed_opt & OCFS2_MOUNT_HB_LOCAL) {
 557                 if (!o2hb_check_local_node_heartbeating()) {
 558                         status = -EINVAL;
 559                         goto read_super_error;
 560                 }
 561         }
 562
 563         /* probe for superblock */
 564         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 565         if (status < 0) {
 566                 mlog(ML_ERROR, "superblock probe failed!\n");
 567                 goto read_super_error;
 568         }
 569
 570         status = ocfs2_initialize_super(sb, bh, sector_size);
 571         osb = OCFS2_SB(sb);
 572         if (status < 0) {
 573                 mlog_errno(status);
 574                 goto read_super_error;
 575         }
 576         brelse(bh);
 577         bh = NULL;
 578         osb->s_mount_opt = parsed_opt;
 579         osb->preferred_slot = slot;
 580
 581         sb->s_magic = OCFS2_SUPER_MAGIC;
 582
 583         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 584          * heartbeat=none */
 585         if (bdev_read_only(sb->s_bdev)) {
 586                 if (!(sb->s_flags & MS_RDONLY)) {
 587                         status = -EACCES;
 588                         mlog(ML_ERROR, "Readonly device detected but readonly "
 589                              "mount was not specified.\n");
 590                         goto read_super_error;
 591                 }
 592
 593                 /* You should not be able to start a local heartbeat
 594                  * on a readonly device. */
 595                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 596                         status = -EROFS;
 597                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 598                              "device.\n");
 599                         goto read_super_error;
 600                 }
 601
 602                 status = ocfs2_check_journals_nolocks(osb);
 603                 if (status < 0) {
 604                         if (status == -EROFS)
 605                                 mlog(ML_ERROR, "Recovery required on readonly "
 606                                      "file system, but write access is "
 607                                      "unavailable.\n");
 608                         else
 609                                 mlog_errno(status);
 610                         goto read_super_error;
 611                 }
 612
 613                 ocfs2_set_ro_flag(osb, 1);
 614
 615                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 616                        "services will be utilized for this mount. Recovery "
 617                        "will be skipped.\n");
 618         }
 619
 620         if (!ocfs2_is_hard_readonly(osb)) {
 621                 if (sb->s_flags & MS_RDONLY)
 622                         ocfs2_set_ro_flag(osb, 0);
 623         }
 624
 625         status = ocfs2_verify_heartbeat(osb);
 626         if (status < 0) {
 627                 mlog_errno(status);
 628                 goto read_super_error;
 629         }
 630
 631         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 632                                                  ocfs2_debugfs_root);
 633         if (!osb->osb_debug_root) {
 634                 status = -EINVAL;
 635                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 636                 goto read_super_error;
 637         }
 638
 639         status = ocfs2_mount_volume(sb);
 640         if (osb->root_inode)
 641                 inode = igrab(osb->root_inode);
 642
 643         if (status < 0)
 644                 goto read_super_error;
 645
 646         if (!inode) {
 647                 status = -EIO;
 648                 mlog_errno(status);
 649                 goto read_super_error;
 650         }
 651
 652         root = d_alloc_root(inode);
 653         if (!root) {
 654                 status = -ENOMEM;
 655                 mlog_errno(status);
 656                 goto read_super_error;
 657         }
 658
 659         sb->s_root = root;
 660
 661         ocfs2_complete_mount_recovery(osb);
 662
 663         if (ocfs2_mount_local(osb))
 664                 snprintf(nodestr, sizeof(nodestr), "local");
 665         else
 666                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
 667
 668         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 669                "with %s data mode.\n",
 670                osb->dev_str, nodestr, osb->slot_num,
 671                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 672                "ordered");
 673
 674         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 675         wake_up(&osb->osb_mount_event);
 676
 677         mlog_exit(status);
 678         return status;
 679
 680 read_super_error:
 681         if (bh != NULL)
 682                 brelse(bh);
 683
 684         if (inode)
 685                 iput(inode);
 686
 687         if (osb) {
 688                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 689                 wake_up(&osb->osb_mount_event);
 690                 ocfs2_dismount_volume(sb, 1);
 691         }
 692
 693         mlog_exit(status);
 694         return status;
 695 }
 696
 697 static int ocfs2_get_sb(struct file_system_type *fs_type,
 698                         int flags,
 699                         const char *dev_name,
 700                         void *data,
 701                         struct vfsmount *mnt)
 702 {
 703         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 704                            mnt);
 705 }
 706
 707 static struct file_system_type ocfs2_fs_type = {
 708         .owner          = THIS_MODULE,
 709         .name           = "ocfs2",
 710         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 711                                         * the fs? */
 712         .kill_sb        = kill_block_super, /* set to the generic one
 713                                              * right now, but do we
 714                                              * need to change that? */
 715         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 716         .next           = NULL
 717 };
 718
 719 static int ocfs2_parse_options(struct super_block *sb,
 720                                char *options,
 721                                unsigned long *mount_opt,
 722                                s16 *slot,
 723                                int is_remount)
 724 {
 725         int status;
 726         char *p;
 727
 728         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 729                    options ? options : "(none)");
 730
 731         *mount_opt = 0;
 732         *slot = OCFS2_INVALID_SLOT;
 733
 734         if (!options) {
 735                 status = 1;
 736                 goto bail;
 737         }
 738
 739         while ((p = strsep(&options, ",")) != NULL) {
 740                 int token, option;
 741                 substring_t args[MAX_OPT_ARGS];
 742                 struct ocfs2_super * osb = OCFS2_SB(sb);
 743
 744                 if (!*p)
 745                         continue;
 746
 747                 token = match_token(p, tokens, args);
 748                 switch (token) {
 749                 case Opt_hb_local:
 750                         *mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 751                         break;
 752                 case Opt_hb_none:
 753                         *mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 754                         break;
 755                 case Opt_barrier:
 756                         if (match_int(&args[0], &option)) {
 757                                 status = 0;
 758                                 goto bail;
 759                         }
 760                         if (option)
 761                                 *mount_opt |= OCFS2_MOUNT_BARRIER;
 762                         else
 763                                 *mount_opt &= ~OCFS2_MOUNT_BARRIER;
 764                         break;
 765                 case Opt_intr:
 766                         *mount_opt &= ~OCFS2_MOUNT_NOINTR;
 767                         break;
 768                 case Opt_nointr:
 769                         *mount_opt |= OCFS2_MOUNT_NOINTR;
 770                         break;
 771                 case Opt_err_panic:
 772                         *mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 773                         break;
 774                 case Opt_err_ro:
 775                         *mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 776                         break;
 777                 case Opt_data_ordered:
 778                         *mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 779                         break;
 780                 case Opt_data_writeback:
 781                         *mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 782                         break;
 783                 case Opt_atime_quantum:
 784                         if (match_int(&args[0], &option)) {
 785                                 status = 0;
 786                                 goto bail;
 787                         }
 788                         if (option >= 0)
 789                                 osb->s_atime_quantum = option;
 790                         else
 791                                 osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 792                         break;
 793                 case Opt_slot:
 794                         option = 0;
 795                         if (match_int(&args[0], &option)) {
 796                                 status = 0;
 797                                 goto bail;
 798                         }
 799                         if (option)
 800                                 *slot = (s16)option;
 801                         break;
 802                 default:
 803                         mlog(ML_ERROR,
 804                              "Unrecognized mount option \"%s\" "
 805                              "or missing value\n", p);
 806                         status = 0;
 807                         goto bail;
 808                 }
 809         }
 810
 811         status = 1;
 812
 813 bail:
 814         mlog_exit(status);
 815         return status;
 816 }
 817
 818 static int __init ocfs2_init(void)
 819 {
 820         int status;
 821
 822         mlog_entry_void();
 823
 824         ocfs2_print_version();
 825
 826         status = init_ocfs2_uptodate_cache();
 827         if (status < 0) {
 828                 mlog_errno(status);
 829                 goto leave;
 830         }
 831
 832         status = ocfs2_initialize_mem_caches();
 833         if (status < 0) {
 834                 mlog_errno(status);
 835                 goto leave;
 836         }
 837
 838         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
 839         if (!ocfs2_wq) {
 840                 status = -ENOMEM;
 841                 goto leave;
 842         }
 843
 844         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
 845         if (!ocfs2_debugfs_root) {
 846                 status = -EFAULT;
 847                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
 848         }
 849
 850 leave:
 851         if (status < 0) {
 852                 ocfs2_free_mem_caches();
 853                 exit_ocfs2_uptodate_cache();
 854         }
 855
 856         mlog_exit(status);
 857
 858         if (status >= 0) {
 859                 return register_filesystem(&ocfs2_fs_type);
 860         } else
 861                 return -1;
 862 }
 863
 864 static void __exit ocfs2_exit(void)
 865 {
 866         mlog_entry_void();
 867
 868         if (ocfs2_wq) {
 869                 flush_workqueue(ocfs2_wq);
 870                 destroy_workqueue(ocfs2_wq);
 871         }
 872
 873         debugfs_remove(ocfs2_debugfs_root);
 874
 875         ocfs2_free_mem_caches();
 876
 877         unregister_filesystem(&ocfs2_fs_type);
 878
 879         exit_ocfs2_uptodate_cache();
 880
 881         mlog_exit_void();
 882 }
 883
 884 static void ocfs2_put_super(struct super_block *sb)
 885 {
 886         mlog_entry("(0x%p)\n", sb);
 887
 888         ocfs2_sync_blockdev(sb);
 889         ocfs2_dismount_volume(sb, 0);
 890
 891         mlog_exit_void();
 892 }
 893
 894 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 895 {
 896         struct ocfs2_super *osb;
 897         u32 numbits, freebits;
 898         int status;
 899         struct ocfs2_dinode *bm_lock;
 900         struct buffer_head *bh = NULL;
 901         struct inode *inode = NULL;
 902
 903         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
 904
 905         osb = OCFS2_SB(dentry->d_sb);
 906
 907         inode = ocfs2_get_system_file_inode(osb,
 908                                             GLOBAL_BITMAP_SYSTEM_INODE,
 909                                             OCFS2_INVALID_SLOT);
 910         if (!inode) {
 911                 mlog(ML_ERROR, "failed to get bitmap inode\n");
 912                 status = -EIO;
 913                 goto bail;
 914         }
 915
 916         status = ocfs2_meta_lock(inode, &bh, 0);
 917         if (status < 0) {
 918                 mlog_errno(status);
 919                 goto bail;
 920         }
 921
 922         bm_lock = (struct ocfs2_dinode *) bh->b_data;
 923
 924         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
 925         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
 926
 927         buf->f_type = OCFS2_SUPER_MAGIC;
 928         buf->f_bsize = dentry->d_sb->s_blocksize;
 929         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
 930         buf->f_blocks = ((sector_t) numbits) *
 931                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
 932         buf->f_bfree = ((sector_t) freebits) *
 933                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
 934         buf->f_bavail = buf->f_bfree;
 935         buf->f_files = numbits;
 936         buf->f_ffree = freebits;
 937
 938         brelse(bh);
 939
 940         ocfs2_meta_unlock(inode, 0);
 941         status = 0;
 942 bail:
 943         if (inode)
 944                 iput(inode);
 945
 946         mlog_exit(status);
 947
 948         return status;
 949 }
 950
 951 static void ocfs2_inode_init_once(void *data,
 952                                   struct kmem_cache *cachep,
 953                                   unsigned long flags)
 954 {
 955         struct ocfs2_inode_info *oi = data;
 956
 957         oi->ip_flags = 0;
 958         oi->ip_open_count = 0;
 959         spin_lock_init(&oi->ip_lock);
 960         ocfs2_extent_map_init(&oi->vfs_inode);
 961         INIT_LIST_HEAD(&oi->ip_io_markers);
 962         oi->ip_created_trans = 0;
 963         oi->ip_last_trans = 0;
 964         oi->ip_dir_start_lookup = 0;
 965
 966         init_rwsem(&oi->ip_alloc_sem);
 967         mutex_init(&oi->ip_io_mutex);
 968
 969         oi->ip_blkno = 0ULL;
 970         oi->ip_clusters = 0;
 971
 972         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
 973         ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
 974         ocfs2_lock_res_init_once(&oi->ip_data_lockres);
 975         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
 976
 977         ocfs2_metadata_cache_init(&oi->vfs_inode);
 978
 979         inode_init_once(&oi->vfs_inode);
 980 }
 981
 982 static int ocfs2_initialize_mem_caches(void)
 983 {
 984         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
 985                                        sizeof(struct ocfs2_inode_info),
 986                                        0,
 987                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
 988                                                 SLAB_MEM_SPREAD),
 989                                        ocfs2_inode_init_once, NULL);
 990         if (!ocfs2_inode_cachep)
 991                 return -ENOMEM;
 992
 993         return 0;
 994 }
 995
 996 static void ocfs2_free_mem_caches(void)
 997 {
 998         if (ocfs2_inode_cachep)
 999                 kmem_cache_destroy(ocfs2_inode_cachep);
1000
1001         ocfs2_inode_cachep = NULL;
1002 }
1003
1004 static int ocfs2_get_sector(struct super_block *sb,
1005                             struct buffer_head **bh,
1006                             int block,
1007                             int sect_size)
1008 {
1009         if (!sb_set_blocksize(sb, sect_size)) {
1010                 mlog(ML_ERROR, "unable to set blocksize\n");
1011                 return -EIO;
1012         }
1013
1014         *bh = sb_getblk(sb, block);
1015         if (!*bh) {
1016                 mlog_errno(-EIO);
1017                 return -EIO;
1018         }
1019         lock_buffer(*bh);
1020         if (!buffer_dirty(*bh))
1021                 clear_buffer_uptodate(*bh);
1022         unlock_buffer(*bh);
1023         ll_rw_block(READ, 1, bh);
1024         wait_on_buffer(*bh);
1025         return 0;
1026 }
1027
1028 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1029 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1030 {
1031         int status;
1032
1033         /* XXX hold a ref on the node while mounte?  easy enough, if
1034          * desirable. */
1035         if (ocfs2_mount_local(osb))
1036                 osb->node_num = 0;
1037         else
1038                 osb->node_num = o2nm_this_node();
1039
1040         if (osb->node_num == O2NM_MAX_NODES) {
1041                 mlog(ML_ERROR, "could not find this host's node number\n");
1042                 status = -ENOENT;
1043                 goto bail;
1044         }
1045
1046         mlog(0, "I am node %d\n", osb->node_num);
1047
1048         status = 0;
1049 bail:
1050         return status;
1051 }
1052
1053 static int ocfs2_mount_volume(struct super_block *sb)
1054 {
1055         int status = 0;
1056         int unlock_super = 0;
1057         struct ocfs2_super *osb = OCFS2_SB(sb);
1058
1059         mlog_entry_void();
1060
1061         if (ocfs2_is_hard_readonly(osb))
1062                 goto leave;
1063
1064         status = ocfs2_fill_local_node_info(osb);
1065         if (status < 0) {
1066                 mlog_errno(status);
1067                 goto leave;
1068         }
1069
1070         status = ocfs2_register_hb_callbacks(osb);
1071         if (status < 0) {
1072                 mlog_errno(status);
1073                 goto leave;
1074         }
1075
1076         status = ocfs2_dlm_init(osb);
1077         if (status < 0) {
1078                 mlog_errno(status);
1079                 goto leave;
1080         }
1081
1082         /* requires vote_thread to be running. */
1083         status = ocfs2_register_net_handlers(osb);
1084         if (status < 0) {
1085                 mlog_errno(status);
1086                 goto leave;
1087         }
1088
1089         status = ocfs2_super_lock(osb, 1);
1090         if (status < 0) {
1091                 mlog_errno(status);
1092                 goto leave;
1093         }
1094         unlock_super = 1;
1095
1096         /* This will load up the node map and add ourselves to it. */
1097         status = ocfs2_find_slot(osb);
1098         if (status < 0) {
1099                 mlog_errno(status);
1100                 goto leave;
1101         }
1102
1103         ocfs2_populate_mounted_map(osb);
1104
1105         /* load all node-local system inodes */
1106         status = ocfs2_init_local_system_inodes(osb);
1107         if (status < 0) {
1108                 mlog_errno(status);
1109                 goto leave;
1110         }
1111
1112         status = ocfs2_check_volume(osb);
1113         if (status < 0) {
1114                 mlog_errno(status);
1115                 goto leave;
1116         }
1117
1118         status = ocfs2_truncate_log_init(osb);
1119         if (status < 0) {
1120                 mlog_errno(status);
1121                 goto leave;
1122         }
1123
1124         if (ocfs2_mount_local(osb))
1125                 goto leave;
1126
1127         /* This should be sent *after* we recovered our journal as it
1128          * will cause other nodes to unmark us as needing
1129          * recovery. However, we need to send it *before* dropping the
1130          * super block lock as otherwise their recovery threads might
1131          * try to clean us up while we're live! */
1132         status = ocfs2_request_mount_vote(osb);
1133         if (status < 0)
1134                 mlog_errno(status);
1135
1136 leave:
1137         if (unlock_super)
1138                 ocfs2_super_unlock(osb, 1);
1139
1140         mlog_exit(status);
1141         return status;
1142 }
1143
1144 /* we can't grab the goofy sem lock from inside wait_event, so we use
1145  * memory barriers to make sure that we'll see the null task before
1146  * being woken up */
1147 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1148 {
1149         mb();
1150         return osb->recovery_thread_task != NULL;
1151 }
1152
1153 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1154 {
1155         int tmp;
1156         struct ocfs2_super *osb = NULL;
1157         char nodestr[8];
1158
1159         mlog_entry("(0x%p)\n", sb);
1160
1161         BUG_ON(!sb);
1162         osb = OCFS2_SB(sb);
1163         BUG_ON(!osb);
1164
1165         ocfs2_shutdown_local_alloc(osb);
1166
1167         ocfs2_truncate_log_shutdown(osb);
1168
1169         /* disable any new recovery threads and wait for any currently
1170          * running ones to exit. Do this before setting the vol_state. */
1171         mutex_lock(&osb->recovery_lock);
1172         osb->disable_recovery = 1;
1173         mutex_unlock(&osb->recovery_lock);
1174         wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1175
1176         /* At this point, we know that no more recovery threads can be
1177          * launched, so wait for any recovery completion work to
1178          * complete. */
1179         flush_workqueue(ocfs2_wq);
1180
1181         ocfs2_journal_shutdown(osb);
1182
1183         ocfs2_sync_blockdev(sb);
1184
1185         /* No dlm means we've failed during mount, so skip all the
1186          * steps which depended on that to complete. */
1187         if (osb->dlm) {
1188                 tmp = ocfs2_super_lock(osb, 1);
1189                 if (tmp < 0) {
1190                         mlog_errno(tmp);
1191                         return;
1192                 }
1193
1194                 tmp = ocfs2_request_umount_vote(osb);
1195                 if (tmp < 0)
1196                         mlog_errno(tmp);
1197
1198                 if (osb->slot_num != OCFS2_INVALID_SLOT)
1199                         ocfs2_put_slot(osb);
1200
1201                 ocfs2_super_unlock(osb, 1);
1202         }
1203
1204         ocfs2_release_system_inodes(osb);
1205
1206         if (osb->dlm) {
1207                 ocfs2_unregister_net_handlers(osb);
1208
1209                 ocfs2_dlm_shutdown(osb);
1210         }
1211
1212         ocfs2_clear_hb_callbacks(osb);
1213
1214         debugfs_remove(osb->osb_debug_root);
1215
1216         if (!mnt_err)
1217                 ocfs2_stop_heartbeat(osb);
1218
1219         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1220
1221         if (ocfs2_mount_local(osb))
1222                 snprintf(nodestr, sizeof(nodestr), "local");
1223         else
1224                 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1225
1226         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1227                osb->dev_str, nodestr);
1228
1229         ocfs2_delete_osb(osb);
1230         kfree(osb);
1231         sb->s_dev = 0;
1232         sb->s_fs_info = NULL;
1233 }
1234
1235 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1236                                 unsigned uuid_bytes)
1237 {
1238         int i, ret;
1239         char *ptr;
1240
1241         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1242
1243         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1244         if (osb->uuid_str == NULL)
1245                 return -ENOMEM;
1246
1247         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1248                 /* print with null */
1249                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1250                 if (ret != 2) /* drop super cleans up */
1251                         return -EINVAL;
1252                 /* then only advance past the last char */
1253                 ptr += 2;
1254         }
1255
1256         return 0;
1257 }
1258
1259 static int ocfs2_initialize_super(struct super_block *sb,
1260                                   struct buffer_head *bh,
1261                                   int sector_size)
1262 {
1263         int status = 0;
1264         int i;
1265         struct ocfs2_dinode *di = NULL;
1266         struct inode *inode = NULL;
1267         struct buffer_head *bitmap_bh = NULL;
1268         struct ocfs2_journal *journal;
1269         __le32 uuid_net_key;
1270         struct ocfs2_super *osb;
1271
1272         mlog_entry_void();
1273
1274         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1275         if (!osb) {
1276                 status = -ENOMEM;
1277                 mlog_errno(status);
1278                 goto bail;
1279         }
1280
1281         sb->s_fs_info = osb;
1282         sb->s_op = &ocfs2_sops;
1283         sb->s_export_op = &ocfs2_export_ops;
1284         sb->s_flags |= MS_NOATIME;
1285         /* this is needed to support O_LARGEFILE */
1286         sb->s_maxbytes = ocfs2_max_file_offset(sb->s_blocksize_bits);
1287
1288         osb->sb = sb;
1289         /* Save off for ocfs2_rw_direct */
1290         osb->s_sectsize_bits = blksize_bits(sector_size);
1291         BUG_ON(!osb->s_sectsize_bits);
1292
1293         osb->net_response_ids = 0;
1294         spin_lock_init(&osb->net_response_lock);
1295         INIT_LIST_HEAD(&osb->net_response_list);
1296
1297         INIT_LIST_HEAD(&osb->osb_net_handlers);
1298         init_waitqueue_head(&osb->recovery_event);
1299         spin_lock_init(&osb->vote_task_lock);
1300         init_waitqueue_head(&osb->vote_event);
1301         osb->vote_work_sequence = 0;
1302         osb->vote_wake_sequence = 0;
1303         INIT_LIST_HEAD(&osb->blocked_lock_list);
1304         osb->blocked_lock_count = 0;
1305         INIT_LIST_HEAD(&osb->vote_list);
1306         spin_lock_init(&osb->osb_lock);
1307
1308         atomic_set(&osb->alloc_stats.moves, 0);
1309         atomic_set(&osb->alloc_stats.local_data, 0);
1310         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1311         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1312         atomic_set(&osb->alloc_stats.bg_extends, 0);
1313
1314         ocfs2_init_node_maps(osb);
1315
1316         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1317                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1318
1319         mutex_init(&osb->recovery_lock);
1320
1321         osb->disable_recovery = 0;
1322         osb->recovery_thread_task = NULL;
1323
1324         init_waitqueue_head(&osb->checkpoint_event);
1325         atomic_set(&osb->needs_checkpoint, 0);
1326
1327         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1328
1329         osb->node_num = O2NM_INVALID_NODE_NUM;
1330         osb->slot_num = OCFS2_INVALID_SLOT;
1331
1332         osb->local_alloc_state = OCFS2_LA_UNUSED;
1333         osb->local_alloc_bh = NULL;
1334
1335         ocfs2_setup_hb_callbacks(osb);
1336
1337         init_waitqueue_head(&osb->osb_mount_event);
1338
1339         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1340         if (!osb->vol_label) {
1341                 mlog(ML_ERROR, "unable to alloc vol label\n");
1342                 status = -ENOMEM;
1343                 goto bail;
1344         }
1345
1346         di = (struct ocfs2_dinode *)bh->b_data;
1347
1348         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1349         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1350                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1351                      osb->max_slots);
1352                 status = -EINVAL;
1353                 goto bail;
1354         }
1355         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1356
1357         init_waitqueue_head(&osb->osb_wipe_event);
1358         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1359                                         sizeof(*osb->osb_orphan_wipes),
1360                                         GFP_KERNEL);
1361         if (!osb->osb_orphan_wipes) {
1362                 status = -ENOMEM;
1363                 mlog_errno(status);
1364                 goto bail;
1365         }
1366
1367         osb->s_feature_compat =
1368                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1369         osb->s_feature_ro_compat =
1370                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1371         osb->s_feature_incompat =
1372                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1373
1374         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1375                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1376                      "optional features (%x).\n", i);
1377                 status = -EINVAL;
1378                 goto bail;
1379         }
1380         if (!(osb->sb->s_flags & MS_RDONLY) &&
1381             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1382                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1383                      "unsupported optional features (%x).\n", i);
1384                 status = -EINVAL;
1385                 goto bail;
1386         }
1387
1388         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1389
1390         /* FIXME
1391          * This should be done in ocfs2_journal_init(), but unknown
1392          * ordering issues will cause the filesystem to crash.
1393          * If anyone wants to figure out what part of the code
1394          * refers to osb->journal before ocfs2_journal_init() is run,
1395          * be my guest.
1396          */
1397         /* initialize our journal structure */
1398
1399         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1400         if (!journal) {
1401                 mlog(ML_ERROR, "unable to alloc journal\n");
1402                 status = -ENOMEM;
1403                 goto bail;
1404         }
1405         osb->journal = journal;
1406         journal->j_osb = osb;
1407
1408         atomic_set(&journal->j_num_trans, 0);
1409         init_rwsem(&journal->j_trans_barrier);
1410         init_waitqueue_head(&journal->j_checkpointed);
1411         spin_lock_init(&journal->j_lock);
1412         journal->j_trans_id = (unsigned long) 1;
1413         INIT_LIST_HEAD(&journal->j_la_cleanups);
1414         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1415         journal->j_state = OCFS2_JOURNAL_FREE;
1416
1417         /* get some pseudo constants for clustersize bits */
1418         osb->s_clustersize_bits =
1419                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1420         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1421         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1422
1423         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1424             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1425                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1426                      osb->s_clustersize);
1427                 status = -EINVAL;
1428                 goto bail;
1429         }
1430
1431         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1432             > (u32)~0UL) {
1433                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1434                      "what jbd can address in 32 bits.\n");
1435                 status = -EINVAL;
1436                 goto bail;
1437         }
1438
1439         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1440                                  sizeof(di->id2.i_super.s_uuid))) {
1441                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1442                 status = -ENOMEM;
1443                 goto bail;
1444         }
1445
1446         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1447         osb->net_key = le32_to_cpu(uuid_net_key);
1448
1449         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1450         osb->vol_label[63] = '\0';
1451         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1452         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1453         osb->first_cluster_group_blkno =
1454                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1455         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1456         mlog(0, "vol_label: %s\n", osb->vol_label);
1457         mlog(0, "uuid: %s\n", osb->uuid_str);
1458         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1459              (unsigned long long)osb->root_blkno,
1460              (unsigned long long)osb->system_dir_blkno);
1461
1462         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1463         if (!osb->osb_dlm_debug) {
1464                 status = -ENOMEM;
1465                 mlog_errno(status);
1466                 goto bail;
1467         }
1468
1469         atomic_set(&osb->vol_state, VOLUME_INIT);
1470
1471         /* load root, system_dir, and all global system inodes */
1472         status = ocfs2_init_global_system_inodes(osb);
1473         if (status < 0) {
1474                 mlog_errno(status);
1475                 goto bail;
1476         }
1477
1478         /*
1479          * global bitmap
1480          */
1481         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1482                                             OCFS2_INVALID_SLOT);
1483         if (!inode) {
1484                 status = -EINVAL;
1485                 mlog_errno(status);
1486                 goto bail;
1487         }
1488
1489         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1490
1491         /* We don't have a cluster lock on the bitmap here because
1492          * we're only interested in static information and the extra
1493          * complexity at mount time isn't worht it. Don't pass the
1494          * inode in to the read function though as we don't want it to
1495          * be put in the cache. */
1496         status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1497                                   NULL);
1498         iput(inode);
1499         if (status < 0) {
1500                 mlog_errno(status);
1501                 goto bail;
1502         }
1503
1504         di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1505         osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1506         brelse(bitmap_bh);
1507         mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1508              (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1509
1510         status = ocfs2_init_slot_info(osb);
1511         if (status < 0) {
1512                 mlog_errno(status);
1513                 goto bail;
1514         }
1515
1516 bail:
1517         mlog_exit(status);
1518         return status;
1519 }
1520
1521 /*
1522  * will return: -EAGAIN if it is ok to keep searching for superblocks
1523  *              -EINVAL if there is a bad superblock
1524  *              0 on success
1525  */
1526 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1527                                struct buffer_head *bh,
1528                                u32 blksz)
1529 {
1530         int status = -EAGAIN;
1531
1532         mlog_entry_void();
1533
1534         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1535                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1536                 status = -EINVAL;
1537                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1538                         mlog(ML_ERROR, "found superblock with incorrect block "
1539                              "size: found %u, should be %u\n",
1540                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1541                                blksz);
1542                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1543                            OCFS2_MAJOR_REV_LEVEL ||
1544                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1545                            OCFS2_MINOR_REV_LEVEL) {
1546                         mlog(ML_ERROR, "found superblock with bad version: "
1547                              "found %u.%u, should be %u.%u\n",
1548                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1549                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1550                              OCFS2_MAJOR_REV_LEVEL,
1551                              OCFS2_MINOR_REV_LEVEL);
1552                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1553                         mlog(ML_ERROR, "bad block number on superblock: "
1554                              "found %llu, should be %llu\n",
1555                              (unsigned long long)le64_to_cpu(di->i_blkno),
1556                              (unsigned long long)bh->b_blocknr);
1557                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1558                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1559                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1560                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1561                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1562                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1563                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1564                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1565                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1566                         mlog(ML_ERROR,
1567                              "Superblock slots found greater than file system "
1568                              "maximum: found %u, max %u\n",
1569                              le16_to_cpu(di->id2.i_super.s_max_slots),
1570                              OCFS2_MAX_SLOTS);
1571                 } else {
1572                         /* found it! */
1573                         status = 0;
1574                 }
1575         }
1576
1577         mlog_exit(status);
1578         return status;
1579 }
1580
1581 static int ocfs2_check_volume(struct ocfs2_super *osb)
1582 {
1583         int status = 0;
1584         int dirty;
1585         int local;
1586         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1587                                                   * recover
1588                                                   * ourselves. */
1589
1590         mlog_entry_void();
1591
1592         /* Init our journal object. */
1593         status = ocfs2_journal_init(osb->journal, &dirty);
1594         if (status < 0) {
1595                 mlog(ML_ERROR, "Could not initialize journal!\n");
1596                 goto finally;
1597         }
1598
1599         /* If the journal was unmounted cleanly then we don't want to
1600          * recover anything. Otherwise, journal_load will do that
1601          * dirty work for us :) */
1602         if (!dirty) {
1603                 status = ocfs2_journal_wipe(osb->journal, 0);
1604                 if (status < 0) {
1605                         mlog_errno(status);
1606                         goto finally;
1607                 }
1608         } else {
1609                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1610                      "recovering volume.\n");
1611         }
1612
1613         local = ocfs2_mount_local(osb);
1614
1615         /* will play back anything left in the journal. */
1616         ocfs2_journal_load(osb->journal, local);
1617
1618         if (dirty) {
1619                 /* recover my local alloc if we didn't unmount cleanly. */
1620                 status = ocfs2_begin_local_alloc_recovery(osb,
1621                                                           osb->slot_num,
1622                                                           &local_alloc);
1623                 if (status < 0) {
1624                         mlog_errno(status);
1625                         goto finally;
1626                 }
1627                 /* we complete the recovery process after we've marked
1628                  * ourselves as mounted. */
1629         }
1630
1631         mlog(0, "Journal loaded.\n");
1632
1633         status = ocfs2_load_local_alloc(osb);
1634         if (status < 0) {
1635                 mlog_errno(status);
1636                 goto finally;
1637         }
1638
1639         if (dirty) {
1640                 /* Recovery will be completed after we've mounted the
1641                  * rest of the volume. */
1642                 osb->dirty = 1;
1643                 osb->local_alloc_copy = local_alloc;
1644                 local_alloc = NULL;
1645         }
1646
1647         /* go through each journal, trylock it and if you get the
1648          * lock, and it's marked as dirty, set the bit in the recover
1649          * map and launch a recovery thread for it. */
1650         status = ocfs2_mark_dead_nodes(osb);
1651         if (status < 0)
1652                 mlog_errno(status);
1653
1654 finally:
1655         if (local_alloc)
1656                 kfree(local_alloc);
1657
1658         mlog_exit(status);
1659         return status;
1660 }
1661
1662 /*
1663  * The routine gets called from dismount or close whenever a dismount on
1664  * volume is requested and the osb open count becomes 1.
1665  * It will remove the osb from the global list and also free up all the
1666  * initialized resources and fileobject.
1667  */
1668 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1669 {
1670         mlog_entry_void();
1671
1672         /* This function assumes that the caller has the main osb resource */
1673
1674         if (osb->slot_info)
1675                 ocfs2_free_slot_info(osb->slot_info);
1676
1677         kfree(osb->osb_orphan_wipes);
1678         /* FIXME
1679          * This belongs in journal shutdown, but because we have to
1680          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1681          * we free it here.
1682          */
1683         kfree(osb->journal);
1684         if (osb->local_alloc_copy)
1685                 kfree(osb->local_alloc_copy);
1686         kfree(osb->uuid_str);
1687         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1688         memset(osb, 0, sizeof(struct ocfs2_super));
1689
1690         mlog_exit_void();
1691 }
1692
1693 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1694  * panic(). We do not support continue-on-error operation. */
1695 static void ocfs2_handle_error(struct super_block *sb)
1696 {
1697         struct ocfs2_super *osb = OCFS2_SB(sb);
1698
1699         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1700                 panic("OCFS2: (device %s): panic forced after error\n",
1701                       sb->s_id);
1702
1703         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1704
1705         if (sb->s_flags & MS_RDONLY &&
1706             (ocfs2_is_soft_readonly(osb) ||
1707              ocfs2_is_hard_readonly(osb)))
1708                 return;
1709
1710         printk(KERN_CRIT "File system is now read-only due to the potential "
1711                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1712                "system is unmounted.\n");
1713         sb->s_flags |= MS_RDONLY;
1714         ocfs2_set_ro_flag(osb, 0);
1715 }
1716
1717 static char error_buf[1024];
1718
1719 void __ocfs2_error(struct super_block *sb,
1720                    const char *function,
1721                    const char *fmt, ...)
1722 {
1723         va_list args;
1724
1725         va_start(args, fmt);
1726         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1727         va_end(args);
1728
1729         /* Not using mlog here because we want to show the actual
1730          * function the error came from. */
1731         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1732                sb->s_id, function, error_buf);
1733
1734         ocfs2_handle_error(sb);
1735 }
1736
1737 /* Handle critical errors. This is intentionally more drastic than
1738  * ocfs2_handle_error, so we only use for things like journal errors,
1739  * etc. */
1740 void __ocfs2_abort(struct super_block* sb,
1741                    const char *function,
1742                    const char *fmt, ...)
1743 {
1744         va_list args;
1745
1746         va_start(args, fmt);
1747         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1748         va_end(args);
1749
1750         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1751                sb->s_id, function, error_buf);
1752
1753         /* We don't have the cluster support yet to go straight to
1754          * hard readonly in here. Until then, we want to keep
1755          * ocfs2_abort() so that we can at least mark critical
1756          * errors.
1757          *
1758          * TODO: This should abort the journal and alert other nodes
1759          * that our slot needs recovery. */
1760
1761         /* Force a panic(). This stinks, but it's better than letting
1762          * things continue without having a proper hard readonly
1763          * here. */
1764         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1765         ocfs2_handle_error(sb);
1766 }
1767
1768 module_init(ocfs2_init);
1769 module_exit(ocfs2_exit);