Merge branch 'vfs' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[linux-3.10.git] / 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/init.h>
32 #include <linux/random.h>
33 #include <linux/statfs.h>
34 #include <linux/moduleparam.h>
35 #include <linux/blkdev.h>
36 #include <linux/socket.h>
37 #include <linux/inet.h>
38 #include <linux/parser.h>
39 #include <linux/crc32.h>
40 #include <linux/debugfs.h>
41 #include <linux/mount.h>
42 #include <linux/seq_file.h>
43 #include <linux/quotaops.h>
44 #include <linux/smp_lock.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 "blockcheck.h"
56 #include "dlmglue.h"
57 #include "export.h"
58 #include "extent_map.h"
59 #include "heartbeat.h"
60 #include "inode.h"
61 #include "journal.h"
62 #include "localalloc.h"
63 #include "namei.h"
64 #include "slot_map.h"
65 #include "super.h"
66 #include "sysfile.h"
67 #include "uptodate.h"
68 #include "ver.h"
69 #include "xattr.h"
70 #include "quota.h"
71 #include "refcounttree.h"
72 #include "suballoc.h"
73
74 #include "buffer_head_io.h"
75
76 static struct kmem_cache *ocfs2_inode_cachep = NULL;
77 struct kmem_cache *ocfs2_dquot_cachep;
78 struct kmem_cache *ocfs2_qf_chunk_cachep;
79
80 /* OCFS2 needs to schedule several differnt types of work which
81  * require cluster locking, disk I/O, recovery waits, etc. Since these
82  * types of work tend to be heavy we avoid using the kernel events
83  * workqueue and schedule on our own. */
84 struct workqueue_struct *ocfs2_wq = NULL;
85
86 static struct dentry *ocfs2_debugfs_root = NULL;
87
88 MODULE_AUTHOR("Oracle");
89 MODULE_LICENSE("GPL");
90
91 struct mount_options
92 {
93         unsigned long   commit_interval;
94         unsigned long   mount_opt;
95         unsigned int    atime_quantum;
96         signed short    slot;
97         int             localalloc_opt;
98         unsigned int    resv_level;
99         int             dir_resv_level;
100         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
101 };
102
103 static int ocfs2_parse_options(struct super_block *sb, char *options,
104                                struct mount_options *mopt,
105                                int is_remount);
106 static int ocfs2_check_set_options(struct super_block *sb,
107                                    struct mount_options *options);
108 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
109 static void ocfs2_put_super(struct super_block *sb);
110 static int ocfs2_mount_volume(struct super_block *sb);
111 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
112 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
113 static int ocfs2_initialize_mem_caches(void);
114 static void ocfs2_free_mem_caches(void);
115 static void ocfs2_delete_osb(struct ocfs2_super *osb);
116
117 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
118
119 static int ocfs2_sync_fs(struct super_block *sb, int wait);
120
121 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
122 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
123 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
124 static int ocfs2_check_volume(struct ocfs2_super *osb);
125 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
126                                struct buffer_head *bh,
127                                u32 sectsize,
128                                struct ocfs2_blockcheck_stats *stats);
129 static int ocfs2_initialize_super(struct super_block *sb,
130                                   struct buffer_head *bh,
131                                   int sector_size,
132                                   struct ocfs2_blockcheck_stats *stats);
133 static int ocfs2_get_sector(struct super_block *sb,
134                             struct buffer_head **bh,
135                             int block,
136                             int sect_size);
137 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
138 static void ocfs2_destroy_inode(struct inode *inode);
139 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
140 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
141 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
142
143 static const struct super_operations ocfs2_sops = {
144         .statfs         = ocfs2_statfs,
145         .alloc_inode    = ocfs2_alloc_inode,
146         .destroy_inode  = ocfs2_destroy_inode,
147         .drop_inode     = ocfs2_drop_inode,
148         .evict_inode    = ocfs2_evict_inode,
149         .sync_fs        = ocfs2_sync_fs,
150         .put_super      = ocfs2_put_super,
151         .remount_fs     = ocfs2_remount,
152         .show_options   = ocfs2_show_options,
153         .quota_read     = ocfs2_quota_read,
154         .quota_write    = ocfs2_quota_write,
155 };
156
157 enum {
158         Opt_barrier,
159         Opt_err_panic,
160         Opt_err_ro,
161         Opt_intr,
162         Opt_nointr,
163         Opt_hb_none,
164         Opt_hb_local,
165         Opt_hb_global,
166         Opt_data_ordered,
167         Opt_data_writeback,
168         Opt_atime_quantum,
169         Opt_slot,
170         Opt_commit,
171         Opt_localalloc,
172         Opt_localflocks,
173         Opt_stack,
174         Opt_user_xattr,
175         Opt_nouser_xattr,
176         Opt_inode64,
177         Opt_acl,
178         Opt_noacl,
179         Opt_usrquota,
180         Opt_grpquota,
181         Opt_coherency_buffered,
182         Opt_coherency_full,
183         Opt_resv_level,
184         Opt_dir_resv_level,
185         Opt_err,
186 };
187
188 static const match_table_t tokens = {
189         {Opt_barrier, "barrier=%u"},
190         {Opt_err_panic, "errors=panic"},
191         {Opt_err_ro, "errors=remount-ro"},
192         {Opt_intr, "intr"},
193         {Opt_nointr, "nointr"},
194         {Opt_hb_none, OCFS2_HB_NONE},
195         {Opt_hb_local, OCFS2_HB_LOCAL},
196         {Opt_hb_global, OCFS2_HB_GLOBAL},
197         {Opt_data_ordered, "data=ordered"},
198         {Opt_data_writeback, "data=writeback"},
199         {Opt_atime_quantum, "atime_quantum=%u"},
200         {Opt_slot, "preferred_slot=%u"},
201         {Opt_commit, "commit=%u"},
202         {Opt_localalloc, "localalloc=%d"},
203         {Opt_localflocks, "localflocks"},
204         {Opt_stack, "cluster_stack=%s"},
205         {Opt_user_xattr, "user_xattr"},
206         {Opt_nouser_xattr, "nouser_xattr"},
207         {Opt_inode64, "inode64"},
208         {Opt_acl, "acl"},
209         {Opt_noacl, "noacl"},
210         {Opt_usrquota, "usrquota"},
211         {Opt_grpquota, "grpquota"},
212         {Opt_coherency_buffered, "coherency=buffered"},
213         {Opt_coherency_full, "coherency=full"},
214         {Opt_resv_level, "resv_level=%u"},
215         {Opt_dir_resv_level, "dir_resv_level=%u"},
216         {Opt_err, NULL}
217 };
218
219 #ifdef CONFIG_DEBUG_FS
220 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
221 {
222         struct ocfs2_cluster_connection *cconn = osb->cconn;
223         struct ocfs2_recovery_map *rm = osb->recovery_map;
224         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
225         int i, out = 0;
226
227         out += snprintf(buf + out, len - out,
228                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
229                         "Device", osb->dev_str, osb->uuid_str,
230                         osb->fs_generation, osb->vol_label);
231
232         out += snprintf(buf + out, len - out,
233                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
234                         atomic_read(&osb->vol_state), osb->osb_flags);
235
236         out += snprintf(buf + out, len - out,
237                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
238                         osb->sb->s_blocksize, osb->s_clustersize);
239
240         out += snprintf(buf + out, len - out,
241                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
242                         "ROcompat: 0x%X\n",
243                         "Features", osb->s_feature_compat,
244                         osb->s_feature_incompat, osb->s_feature_ro_compat);
245
246         out += snprintf(buf + out, len - out,
247                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
248                         osb->s_mount_opt, osb->s_atime_quantum);
249
250         if (cconn) {
251                 out += snprintf(buf + out, len - out,
252                                 "%10s => Stack: %s  Name: %*s  "
253                                 "Version: %d.%d\n", "Cluster",
254                                 (*osb->osb_cluster_stack == '\0' ?
255                                  "o2cb" : osb->osb_cluster_stack),
256                                 cconn->cc_namelen, cconn->cc_name,
257                                 cconn->cc_version.pv_major,
258                                 cconn->cc_version.pv_minor);
259         }
260
261         spin_lock(&osb->dc_task_lock);
262         out += snprintf(buf + out, len - out,
263                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
264                         "WorkSeq: %lu\n", "DownCnvt",
265                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
266                         osb->blocked_lock_count, osb->dc_wake_sequence,
267                         osb->dc_work_sequence);
268         spin_unlock(&osb->dc_task_lock);
269
270         spin_lock(&osb->osb_lock);
271         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
272                         "Recovery",
273                         (osb->recovery_thread_task ?
274                          task_pid_nr(osb->recovery_thread_task) : -1));
275         if (rm->rm_used == 0)
276                 out += snprintf(buf + out, len - out, " None\n");
277         else {
278                 for (i = 0; i < rm->rm_used; i++)
279                         out += snprintf(buf + out, len - out, " %d",
280                                         rm->rm_entries[i]);
281                 out += snprintf(buf + out, len - out, "\n");
282         }
283         spin_unlock(&osb->osb_lock);
284
285         out += snprintf(buf + out, len - out,
286                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
287                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
288                         osb->osb_commit_interval,
289                         atomic_read(&osb->needs_checkpoint));
290
291         out += snprintf(buf + out, len - out,
292                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
293                         "Journal", osb->journal->j_state,
294                         osb->journal->j_trans_id,
295                         atomic_read(&osb->journal->j_num_trans));
296
297         out += snprintf(buf + out, len - out,
298                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
299                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
300                         "Stats",
301                         atomic_read(&osb->alloc_stats.bitmap_data),
302                         atomic_read(&osb->alloc_stats.local_data),
303                         atomic_read(&osb->alloc_stats.bg_allocs),
304                         atomic_read(&osb->alloc_stats.moves),
305                         atomic_read(&osb->alloc_stats.bg_extends));
306
307         out += snprintf(buf + out, len - out,
308                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
309                         "Default: %u bits\n",
310                         "LocalAlloc", osb->local_alloc_state,
311                         (unsigned long long)osb->la_last_gd,
312                         osb->local_alloc_bits, osb->local_alloc_default_bits);
313
314         spin_lock(&osb->osb_lock);
315         out += snprintf(buf + out, len - out,
316                         "%10s => InodeSlot: %d  StolenInodes: %d, "
317                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
318                         osb->s_inode_steal_slot,
319                         atomic_read(&osb->s_num_inodes_stolen),
320                         osb->s_meta_steal_slot,
321                         atomic_read(&osb->s_num_meta_stolen));
322         spin_unlock(&osb->osb_lock);
323
324         out += snprintf(buf + out, len - out, "OrphanScan => ");
325         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
326                         os->os_count, os->os_seqno);
327         out += snprintf(buf + out, len - out, " Last Scan: ");
328         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
329                 out += snprintf(buf + out, len - out, "Disabled\n");
330         else
331                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
332                                 (get_seconds() - os->os_scantime.tv_sec));
333
334         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
335                         "Slots", "Num", "RecoGen");
336         for (i = 0; i < osb->max_slots; ++i) {
337                 out += snprintf(buf + out, len - out,
338                                 "%10s  %c %3d  %10d\n",
339                                 " ",
340                                 (i == osb->slot_num ? '*' : ' '),
341                                 i, osb->slot_recovery_generations[i]);
342         }
343
344         return out;
345 }
346
347 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
348 {
349         struct ocfs2_super *osb = inode->i_private;
350         char *buf = NULL;
351
352         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
353         if (!buf)
354                 goto bail;
355
356         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
357
358         file->private_data = buf;
359
360         return 0;
361 bail:
362         return -ENOMEM;
363 }
364
365 static int ocfs2_debug_release(struct inode *inode, struct file *file)
366 {
367         kfree(file->private_data);
368         return 0;
369 }
370
371 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
372                                 size_t nbytes, loff_t *ppos)
373 {
374         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
375                                        i_size_read(file->f_mapping->host));
376 }
377 #else
378 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
379 {
380         return 0;
381 }
382 static int ocfs2_debug_release(struct inode *inode, struct file *file)
383 {
384         return 0;
385 }
386 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
387                                 size_t nbytes, loff_t *ppos)
388 {
389         return 0;
390 }
391 #endif  /* CONFIG_DEBUG_FS */
392
393 static const struct file_operations ocfs2_osb_debug_fops = {
394         .open =         ocfs2_osb_debug_open,
395         .release =      ocfs2_debug_release,
396         .read =         ocfs2_debug_read,
397         .llseek =       generic_file_llseek,
398 };
399
400 static int ocfs2_sync_fs(struct super_block *sb, int wait)
401 {
402         int status;
403         tid_t target;
404         struct ocfs2_super *osb = OCFS2_SB(sb);
405
406         if (ocfs2_is_hard_readonly(osb))
407                 return -EROFS;
408
409         if (wait) {
410                 status = ocfs2_flush_truncate_log(osb);
411                 if (status < 0)
412                         mlog_errno(status);
413         } else {
414                 ocfs2_schedule_truncate_log_flush(osb, 0);
415         }
416
417         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
418                                       &target)) {
419                 if (wait)
420                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
421                                              target);
422         }
423         return 0;
424 }
425
426 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
427 {
428         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
429             && (ino == USER_QUOTA_SYSTEM_INODE
430                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
431                 return 0;
432         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
433             && (ino == GROUP_QUOTA_SYSTEM_INODE
434                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
435                 return 0;
436         return 1;
437 }
438
439 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
440 {
441         struct inode *new = NULL;
442         int status = 0;
443         int i;
444
445         mlog_entry_void();
446
447         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
448         if (IS_ERR(new)) {
449                 status = PTR_ERR(new);
450                 mlog_errno(status);
451                 goto bail;
452         }
453         osb->root_inode = new;
454
455         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
456         if (IS_ERR(new)) {
457                 status = PTR_ERR(new);
458                 mlog_errno(status);
459                 goto bail;
460         }
461         osb->sys_root_inode = new;
462
463         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
464              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
465                 if (!ocfs2_need_system_inode(osb, i))
466                         continue;
467                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
468                 if (!new) {
469                         ocfs2_release_system_inodes(osb);
470                         status = -EINVAL;
471                         mlog_errno(status);
472                         /* FIXME: Should ERROR_RO_FS */
473                         mlog(ML_ERROR, "Unable to load system inode %d, "
474                              "possibly corrupt fs?", i);
475                         goto bail;
476                 }
477                 // the array now has one ref, so drop this one
478                 iput(new);
479         }
480
481 bail:
482         mlog_exit(status);
483         return status;
484 }
485
486 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
487 {
488         struct inode *new = NULL;
489         int status = 0;
490         int i;
491
492         mlog_entry_void();
493
494         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
495              i < NUM_SYSTEM_INODES;
496              i++) {
497                 if (!ocfs2_need_system_inode(osb, i))
498                         continue;
499                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
500                 if (!new) {
501                         ocfs2_release_system_inodes(osb);
502                         status = -EINVAL;
503                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
504                              status, i, osb->slot_num);
505                         goto bail;
506                 }
507                 /* the array now has one ref, so drop this one */
508                 iput(new);
509         }
510
511 bail:
512         mlog_exit(status);
513         return status;
514 }
515
516 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
517 {
518         int i;
519         struct inode *inode;
520
521         mlog_entry_void();
522
523         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
524                 inode = osb->global_system_inodes[i];
525                 if (inode) {
526                         iput(inode);
527                         osb->global_system_inodes[i] = NULL;
528                 }
529         }
530
531         inode = osb->sys_root_inode;
532         if (inode) {
533                 iput(inode);
534                 osb->sys_root_inode = NULL;
535         }
536
537         inode = osb->root_inode;
538         if (inode) {
539                 iput(inode);
540                 osb->root_inode = NULL;
541         }
542
543         if (!osb->local_system_inodes)
544                 goto out;
545
546         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
547                 if (osb->local_system_inodes[i]) {
548                         iput(osb->local_system_inodes[i]);
549                         osb->local_system_inodes[i] = NULL;
550                 }
551         }
552
553         kfree(osb->local_system_inodes);
554         osb->local_system_inodes = NULL;
555
556 out:
557         mlog_exit(0);
558 }
559
560 /* We're allocating fs objects, use GFP_NOFS */
561 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
562 {
563         struct ocfs2_inode_info *oi;
564
565         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
566         if (!oi)
567                 return NULL;
568
569         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
570         return &oi->vfs_inode;
571 }
572
573 static void ocfs2_destroy_inode(struct inode *inode)
574 {
575         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
576 }
577
578 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
579                                                 unsigned int cbits)
580 {
581         unsigned int bytes = 1 << cbits;
582         unsigned int trim = bytes;
583         unsigned int bitshift = 32;
584
585         /*
586          * i_size and all block offsets in ocfs2 are always 64 bits
587          * wide. i_clusters is 32 bits, in cluster-sized units. So on
588          * 64 bit platforms, cluster size will be the limiting factor.
589          */
590
591 #if BITS_PER_LONG == 32
592 # if defined(CONFIG_LBDAF)
593         BUILD_BUG_ON(sizeof(sector_t) != 8);
594         /*
595          * We might be limited by page cache size.
596          */
597         if (bytes > PAGE_CACHE_SIZE) {
598                 bytes = PAGE_CACHE_SIZE;
599                 trim = 1;
600                 /*
601                  * Shift by 31 here so that we don't get larger than
602                  * MAX_LFS_FILESIZE
603                  */
604                 bitshift = 31;
605         }
606 # else
607         /*
608          * We are limited by the size of sector_t. Use block size, as
609          * that's what we expose to the VFS.
610          */
611         bytes = 1 << bbits;
612         trim = 1;
613         bitshift = 31;
614 # endif
615 #endif
616
617         /*
618          * Trim by a whole cluster when we can actually approach the
619          * on-disk limits. Otherwise we can overflow i_clusters when
620          * an extent start is at the max offset.
621          */
622         return (((unsigned long long)bytes) << bitshift) - trim;
623 }
624
625 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
626 {
627         int incompat_features;
628         int ret = 0;
629         struct mount_options parsed_options;
630         struct ocfs2_super *osb = OCFS2_SB(sb);
631         u32 tmp;
632
633         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
634             !ocfs2_check_set_options(sb, &parsed_options)) {
635                 ret = -EINVAL;
636                 goto out;
637         }
638
639         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
640                 OCFS2_MOUNT_HB_NONE;
641         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
642                 ret = -EINVAL;
643                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
644                 goto out;
645         }
646
647         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
648             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
649                 ret = -EINVAL;
650                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
651                 goto out;
652         }
653
654         /* Probably don't want this on remount; it might
655          * mess with other nodes */
656         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
657             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
658                 ret = -EINVAL;
659                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
660                 goto out;
661         }
662
663         /* We're going to/from readonly mode. */
664         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
665                 /* Disable quota accounting before remounting RO */
666                 if (*flags & MS_RDONLY) {
667                         ret = ocfs2_susp_quotas(osb, 0);
668                         if (ret < 0)
669                                 goto out;
670                 }
671                 /* Lock here so the check of HARD_RO and the potential
672                  * setting of SOFT_RO is atomic. */
673                 spin_lock(&osb->osb_lock);
674                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
675                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
676                         ret = -EROFS;
677                         goto unlock_osb;
678                 }
679
680                 if (*flags & MS_RDONLY) {
681                         mlog(0, "Going to ro mode.\n");
682                         sb->s_flags |= MS_RDONLY;
683                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
684                 } else {
685                         mlog(0, "Making ro filesystem writeable.\n");
686
687                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
688                                 mlog(ML_ERROR, "Cannot remount RDWR "
689                                      "filesystem due to previous errors.\n");
690                                 ret = -EROFS;
691                                 goto unlock_osb;
692                         }
693                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
694                         if (incompat_features) {
695                                 mlog(ML_ERROR, "Cannot remount RDWR because "
696                                      "of unsupported optional features "
697                                      "(%x).\n", incompat_features);
698                                 ret = -EINVAL;
699                                 goto unlock_osb;
700                         }
701                         sb->s_flags &= ~MS_RDONLY;
702                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
703                 }
704 unlock_osb:
705                 spin_unlock(&osb->osb_lock);
706                 /* Enable quota accounting after remounting RW */
707                 if (!ret && !(*flags & MS_RDONLY)) {
708                         if (sb_any_quota_suspended(sb))
709                                 ret = ocfs2_susp_quotas(osb, 1);
710                         else
711                                 ret = ocfs2_enable_quotas(osb);
712                         if (ret < 0) {
713                                 /* Return back changes... */
714                                 spin_lock(&osb->osb_lock);
715                                 sb->s_flags |= MS_RDONLY;
716                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
717                                 spin_unlock(&osb->osb_lock);
718                                 goto out;
719                         }
720                 }
721         }
722
723         if (!ret) {
724                 /* Only save off the new mount options in case of a successful
725                  * remount. */
726                 osb->s_mount_opt = parsed_options.mount_opt;
727                 osb->s_atime_quantum = parsed_options.atime_quantum;
728                 osb->preferred_slot = parsed_options.slot;
729                 if (parsed_options.commit_interval)
730                         osb->osb_commit_interval = parsed_options.commit_interval;
731
732                 if (!ocfs2_is_hard_readonly(osb))
733                         ocfs2_set_journal_params(osb);
734
735                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
736                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
737                                                         MS_POSIXACL : 0);
738         }
739 out:
740         return ret;
741 }
742
743 static int ocfs2_sb_probe(struct super_block *sb,
744                           struct buffer_head **bh,
745                           int *sector_size,
746                           struct ocfs2_blockcheck_stats *stats)
747 {
748         int status, tmpstat;
749         struct ocfs1_vol_disk_hdr *hdr;
750         struct ocfs2_dinode *di;
751         int blksize;
752
753         *bh = NULL;
754
755         /* may be > 512 */
756         *sector_size = bdev_logical_block_size(sb->s_bdev);
757         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
758                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
759                      *sector_size, OCFS2_MAX_BLOCKSIZE);
760                 status = -EINVAL;
761                 goto bail;
762         }
763
764         /* Can this really happen? */
765         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
766                 *sector_size = OCFS2_MIN_BLOCKSIZE;
767
768         /* check block zero for old format */
769         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
770         if (status < 0) {
771                 mlog_errno(status);
772                 goto bail;
773         }
774         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
775         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
776                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
777                      hdr->major_version, hdr->minor_version);
778                 status = -EINVAL;
779         }
780         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
781                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
782                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
783                      hdr->signature);
784                 status = -EINVAL;
785         }
786         brelse(*bh);
787         *bh = NULL;
788         if (status < 0) {
789                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
790                      "upgraded before mounting with ocfs v2\n");
791                 goto bail;
792         }
793
794         /*
795          * Now check at magic offset for 512, 1024, 2048, 4096
796          * blocksizes.  4096 is the maximum blocksize because it is
797          * the minimum clustersize.
798          */
799         status = -EINVAL;
800         for (blksize = *sector_size;
801              blksize <= OCFS2_MAX_BLOCKSIZE;
802              blksize <<= 1) {
803                 tmpstat = ocfs2_get_sector(sb, bh,
804                                            OCFS2_SUPER_BLOCK_BLKNO,
805                                            blksize);
806                 if (tmpstat < 0) {
807                         status = tmpstat;
808                         mlog_errno(status);
809                         break;
810                 }
811                 di = (struct ocfs2_dinode *) (*bh)->b_data;
812                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
813                 spin_lock_init(&stats->b_lock);
814                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
815                 if (tmpstat < 0) {
816                         brelse(*bh);
817                         *bh = NULL;
818                 }
819                 if (tmpstat != -EAGAIN) {
820                         status = tmpstat;
821                         break;
822                 }
823         }
824
825 bail:
826         return status;
827 }
828
829 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
830 {
831         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
832
833         if (osb->s_mount_opt & hb_enabled) {
834                 if (ocfs2_mount_local(osb)) {
835                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
836                              "mounted device.\n");
837                         return -EINVAL;
838                 }
839                 if (ocfs2_userspace_stack(osb)) {
840                         mlog(ML_ERROR, "Userspace stack expected, but "
841                              "o2cb heartbeat arguments passed to mount\n");
842                         return -EINVAL;
843                 }
844                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
845                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
846                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
847                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
848                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
849                         return -EINVAL;
850                 }
851         }
852
853         if (!(osb->s_mount_opt & hb_enabled)) {
854                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
855                     !ocfs2_userspace_stack(osb)) {
856                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
857                              "a read-write clustered device.\n");
858                         return -EINVAL;
859                 }
860         }
861
862         return 0;
863 }
864
865 /*
866  * If we're using a userspace stack, mount should have passed
867  * a name that matches the disk.  If not, mount should not
868  * have passed a stack.
869  */
870 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
871                                         struct mount_options *mopt)
872 {
873         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
874                 mlog(ML_ERROR,
875                      "cluster stack passed to mount, but this filesystem "
876                      "does not support it\n");
877                 return -EINVAL;
878         }
879
880         if (ocfs2_userspace_stack(osb) &&
881             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
882                     OCFS2_STACK_LABEL_LEN)) {
883                 mlog(ML_ERROR,
884                      "cluster stack passed to mount (\"%s\") does not "
885                      "match the filesystem (\"%s\")\n",
886                      mopt->cluster_stack,
887                      osb->osb_cluster_stack);
888                 return -EINVAL;
889         }
890
891         return 0;
892 }
893
894 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
895 {
896         int type;
897         struct super_block *sb = osb->sb;
898         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
899                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
900         int status = 0;
901
902         for (type = 0; type < MAXQUOTAS; type++) {
903                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
904                         continue;
905                 if (unsuspend)
906                         status = dquot_resume(sb, type);
907                 else {
908                         struct ocfs2_mem_dqinfo *oinfo;
909
910                         /* Cancel periodic syncing before suspending */
911                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
912                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
913                         status = dquot_suspend(sb, type);
914                 }
915                 if (status < 0)
916                         break;
917         }
918         if (status < 0)
919                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
920                      "remount (error = %d).\n", status);
921         return status;
922 }
923
924 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
925 {
926         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
927         struct super_block *sb = osb->sb;
928         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
929                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
930         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
931                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
932         int status;
933         int type;
934
935         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
936         for (type = 0; type < MAXQUOTAS; type++) {
937                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
938                         continue;
939                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
940                                                         osb->slot_num);
941                 if (!inode[type]) {
942                         status = -ENOENT;
943                         goto out_quota_off;
944                 }
945                 status = dquot_enable(inode[type], type, QFMT_OCFS2,
946                                       DQUOT_USAGE_ENABLED);
947                 if (status < 0)
948                         goto out_quota_off;
949         }
950
951         for (type = 0; type < MAXQUOTAS; type++)
952                 iput(inode[type]);
953         return 0;
954 out_quota_off:
955         ocfs2_disable_quotas(osb);
956         for (type = 0; type < MAXQUOTAS; type++)
957                 iput(inode[type]);
958         mlog_errno(status);
959         return status;
960 }
961
962 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
963 {
964         int type;
965         struct inode *inode;
966         struct super_block *sb = osb->sb;
967         struct ocfs2_mem_dqinfo *oinfo;
968
969         /* We mostly ignore errors in this function because there's not much
970          * we can do when we see them */
971         for (type = 0; type < MAXQUOTAS; type++) {
972                 if (!sb_has_quota_loaded(sb, type))
973                         continue;
974                 /* Cancel periodic syncing before we grab dqonoff_mutex */
975                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
976                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
977                 inode = igrab(sb->s_dquot.files[type]);
978                 /* Turn off quotas. This will remove all dquot structures from
979                  * memory and so they will be automatically synced to global
980                  * quota files */
981                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
982                                         DQUOT_LIMITS_ENABLED);
983                 if (!inode)
984                         continue;
985                 iput(inode);
986         }
987 }
988
989 /* Handle quota on quotactl */
990 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
991                           char *path)
992 {
993         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
994                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
995
996         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
997                 return -EINVAL;
998
999         return dquot_enable(sb_dqopt(sb)->files[type], type,
1000                             format_id, DQUOT_LIMITS_ENABLED);
1001 }
1002
1003 /* Handle quota off quotactl */
1004 static int ocfs2_quota_off(struct super_block *sb, int type)
1005 {
1006         return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1007 }
1008
1009 static const struct quotactl_ops ocfs2_quotactl_ops = {
1010         .quota_on       = ocfs2_quota_on,
1011         .quota_off      = ocfs2_quota_off,
1012         .quota_sync     = dquot_quota_sync,
1013         .get_info       = dquot_get_dqinfo,
1014         .set_info       = dquot_set_dqinfo,
1015         .get_dqblk      = dquot_get_dqblk,
1016         .set_dqblk      = dquot_set_dqblk,
1017 };
1018
1019 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1020 {
1021         struct dentry *root;
1022         int status, sector_size;
1023         struct mount_options parsed_options;
1024         struct inode *inode = NULL;
1025         struct ocfs2_super *osb = NULL;
1026         struct buffer_head *bh = NULL;
1027         char nodestr[8];
1028         struct ocfs2_blockcheck_stats stats;
1029
1030         mlog_entry("%p, %p, %i", sb, data, silent);
1031
1032         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1033                 status = -EINVAL;
1034                 goto read_super_error;
1035         }
1036
1037         /* probe for superblock */
1038         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1039         if (status < 0) {
1040                 mlog(ML_ERROR, "superblock probe failed!\n");
1041                 goto read_super_error;
1042         }
1043
1044         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1045         osb = OCFS2_SB(sb);
1046         if (status < 0) {
1047                 mlog_errno(status);
1048                 goto read_super_error;
1049         }
1050         brelse(bh);
1051         bh = NULL;
1052
1053         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1054                 status = -EINVAL;
1055                 goto read_super_error;
1056         }
1057         osb->s_mount_opt = parsed_options.mount_opt;
1058         osb->s_atime_quantum = parsed_options.atime_quantum;
1059         osb->preferred_slot = parsed_options.slot;
1060         osb->osb_commit_interval = parsed_options.commit_interval;
1061
1062         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1063         osb->osb_resv_level = parsed_options.resv_level;
1064         osb->osb_dir_resv_level = parsed_options.resv_level;
1065         if (parsed_options.dir_resv_level == -1)
1066                 osb->osb_dir_resv_level = parsed_options.resv_level;
1067         else
1068                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1069
1070         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1071         if (status)
1072                 goto read_super_error;
1073
1074         sb->s_magic = OCFS2_SUPER_MAGIC;
1075
1076         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1077                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1078
1079         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1080          * heartbeat=none */
1081         if (bdev_read_only(sb->s_bdev)) {
1082                 if (!(sb->s_flags & MS_RDONLY)) {
1083                         status = -EACCES;
1084                         mlog(ML_ERROR, "Readonly device detected but readonly "
1085                              "mount was not specified.\n");
1086                         goto read_super_error;
1087                 }
1088
1089                 /* You should not be able to start a local heartbeat
1090                  * on a readonly device. */
1091                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1092                         status = -EROFS;
1093                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1094                              "device.\n");
1095                         goto read_super_error;
1096                 }
1097
1098                 status = ocfs2_check_journals_nolocks(osb);
1099                 if (status < 0) {
1100                         if (status == -EROFS)
1101                                 mlog(ML_ERROR, "Recovery required on readonly "
1102                                      "file system, but write access is "
1103                                      "unavailable.\n");
1104                         else
1105                                 mlog_errno(status);
1106                         goto read_super_error;
1107                 }
1108
1109                 ocfs2_set_ro_flag(osb, 1);
1110
1111                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1112                        "services will be utilized for this mount. Recovery "
1113                        "will be skipped.\n");
1114         }
1115
1116         if (!ocfs2_is_hard_readonly(osb)) {
1117                 if (sb->s_flags & MS_RDONLY)
1118                         ocfs2_set_ro_flag(osb, 0);
1119         }
1120
1121         status = ocfs2_verify_heartbeat(osb);
1122         if (status < 0) {
1123                 mlog_errno(status);
1124                 goto read_super_error;
1125         }
1126
1127         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1128                                                  ocfs2_debugfs_root);
1129         if (!osb->osb_debug_root) {
1130                 status = -EINVAL;
1131                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1132                 goto read_super_error;
1133         }
1134
1135         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1136                                             osb->osb_debug_root,
1137                                             osb,
1138                                             &ocfs2_osb_debug_fops);
1139         if (!osb->osb_ctxt) {
1140                 status = -EINVAL;
1141                 mlog_errno(status);
1142                 goto read_super_error;
1143         }
1144
1145         if (ocfs2_meta_ecc(osb)) {
1146                 status = ocfs2_blockcheck_stats_debugfs_install(
1147                                                 &osb->osb_ecc_stats,
1148                                                 osb->osb_debug_root);
1149                 if (status) {
1150                         mlog(ML_ERROR,
1151                              "Unable to create blockcheck statistics "
1152                              "files\n");
1153                         goto read_super_error;
1154                 }
1155         }
1156
1157         status = ocfs2_mount_volume(sb);
1158         if (osb->root_inode)
1159                 inode = igrab(osb->root_inode);
1160
1161         if (status < 0)
1162                 goto read_super_error;
1163
1164         if (!inode) {
1165                 status = -EIO;
1166                 mlog_errno(status);
1167                 goto read_super_error;
1168         }
1169
1170         root = d_alloc_root(inode);
1171         if (!root) {
1172                 status = -ENOMEM;
1173                 mlog_errno(status);
1174                 goto read_super_error;
1175         }
1176
1177         sb->s_root = root;
1178
1179         ocfs2_complete_mount_recovery(osb);
1180
1181         if (ocfs2_mount_local(osb))
1182                 snprintf(nodestr, sizeof(nodestr), "local");
1183         else
1184                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1185
1186         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1187                "with %s data mode.\n",
1188                osb->dev_str, nodestr, osb->slot_num,
1189                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1190                "ordered");
1191
1192         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1193         wake_up(&osb->osb_mount_event);
1194
1195         /* Now we can initialize quotas because we can afford to wait
1196          * for cluster locks recovery now. That also means that truncation
1197          * log recovery can happen but that waits for proper quota setup */
1198         if (!(sb->s_flags & MS_RDONLY)) {
1199                 status = ocfs2_enable_quotas(osb);
1200                 if (status < 0) {
1201                         /* We have to err-out specially here because
1202                          * s_root is already set */
1203                         mlog_errno(status);
1204                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1205                         wake_up(&osb->osb_mount_event);
1206                         mlog_exit(status);
1207                         return status;
1208                 }
1209         }
1210
1211         ocfs2_complete_quota_recovery(osb);
1212
1213         /* Now we wake up again for processes waiting for quotas */
1214         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1215         wake_up(&osb->osb_mount_event);
1216
1217         /* Start this when the mount is almost sure of being successful */
1218         ocfs2_orphan_scan_start(osb);
1219
1220         mlog_exit(status);
1221         return status;
1222
1223 read_super_error:
1224         brelse(bh);
1225
1226         if (inode)
1227                 iput(inode);
1228
1229         if (osb) {
1230                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1231                 wake_up(&osb->osb_mount_event);
1232                 ocfs2_dismount_volume(sb, 1);
1233         }
1234
1235         mlog_exit(status);
1236         return status;
1237 }
1238
1239 static int ocfs2_get_sb(struct file_system_type *fs_type,
1240                         int flags,
1241                         const char *dev_name,
1242                         void *data,
1243                         struct vfsmount *mnt)
1244 {
1245         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1246                            mnt);
1247 }
1248
1249 static void ocfs2_kill_sb(struct super_block *sb)
1250 {
1251         struct ocfs2_super *osb = OCFS2_SB(sb);
1252
1253         /* Failed mount? */
1254         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1255                 goto out;
1256
1257         /* Prevent further queueing of inode drop events */
1258         spin_lock(&dentry_list_lock);
1259         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1260         spin_unlock(&dentry_list_lock);
1261         /* Wait for work to finish and/or remove it */
1262         cancel_work_sync(&osb->dentry_lock_work);
1263 out:
1264         kill_block_super(sb);
1265 }
1266
1267 static struct file_system_type ocfs2_fs_type = {
1268         .owner          = THIS_MODULE,
1269         .name           = "ocfs2",
1270         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1271                                         * the fs? */
1272         .kill_sb        = ocfs2_kill_sb,
1273
1274         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1275         .next           = NULL
1276 };
1277
1278 static int ocfs2_check_set_options(struct super_block *sb,
1279                                    struct mount_options *options)
1280 {
1281         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1282             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1283                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1284                 mlog(ML_ERROR, "User quotas were requested, but this "
1285                      "filesystem does not have the feature enabled.\n");
1286                 return 0;
1287         }
1288         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1289             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1290                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1291                 mlog(ML_ERROR, "Group quotas were requested, but this "
1292                      "filesystem does not have the feature enabled.\n");
1293                 return 0;
1294         }
1295         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1296             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1297                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1298                      "feature is not enabled\n");
1299                 return 0;
1300         }
1301         /* No ACL setting specified? Use XATTR feature... */
1302         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1303                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1304                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1305                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1306                 else
1307                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1308         }
1309         return 1;
1310 }
1311
1312 static int ocfs2_parse_options(struct super_block *sb,
1313                                char *options,
1314                                struct mount_options *mopt,
1315                                int is_remount)
1316 {
1317         int status;
1318         char *p;
1319         u32 tmp;
1320
1321         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1322                    options ? options : "(none)");
1323
1324         mopt->commit_interval = 0;
1325         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1326         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1327         mopt->slot = OCFS2_INVALID_SLOT;
1328         mopt->localalloc_opt = -1;
1329         mopt->cluster_stack[0] = '\0';
1330         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1331         mopt->dir_resv_level = -1;
1332
1333         if (!options) {
1334                 status = 1;
1335                 goto bail;
1336         }
1337
1338         while ((p = strsep(&options, ",")) != NULL) {
1339                 int token, option;
1340                 substring_t args[MAX_OPT_ARGS];
1341
1342                 if (!*p)
1343                         continue;
1344
1345                 token = match_token(p, tokens, args);
1346                 switch (token) {
1347                 case Opt_hb_local:
1348                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1349                         break;
1350                 case Opt_hb_none:
1351                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1352                         break;
1353                 case Opt_hb_global:
1354                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1355                         break;
1356                 case Opt_barrier:
1357                         if (match_int(&args[0], &option)) {
1358                                 status = 0;
1359                                 goto bail;
1360                         }
1361                         if (option)
1362                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1363                         else
1364                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1365                         break;
1366                 case Opt_intr:
1367                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1368                         break;
1369                 case Opt_nointr:
1370                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1371                         break;
1372                 case Opt_err_panic:
1373                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1374                         break;
1375                 case Opt_err_ro:
1376                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1377                         break;
1378                 case Opt_data_ordered:
1379                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1380                         break;
1381                 case Opt_data_writeback:
1382                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1383                         break;
1384                 case Opt_user_xattr:
1385                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1386                         break;
1387                 case Opt_nouser_xattr:
1388                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1389                         break;
1390                 case Opt_atime_quantum:
1391                         if (match_int(&args[0], &option)) {
1392                                 status = 0;
1393                                 goto bail;
1394                         }
1395                         if (option >= 0)
1396                                 mopt->atime_quantum = option;
1397                         break;
1398                 case Opt_slot:
1399                         option = 0;
1400                         if (match_int(&args[0], &option)) {
1401                                 status = 0;
1402                                 goto bail;
1403                         }
1404                         if (option)
1405                                 mopt->slot = (s16)option;
1406                         break;
1407                 case Opt_commit:
1408                         option = 0;
1409                         if (match_int(&args[0], &option)) {
1410                                 status = 0;
1411                                 goto bail;
1412                         }
1413                         if (option < 0)
1414                                 return 0;
1415                         if (option == 0)
1416                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1417                         mopt->commit_interval = HZ * option;
1418                         break;
1419                 case Opt_localalloc:
1420                         option = 0;
1421                         if (match_int(&args[0], &option)) {
1422                                 status = 0;
1423                                 goto bail;
1424                         }
1425                         if (option >= 0)
1426                                 mopt->localalloc_opt = option;
1427                         break;
1428                 case Opt_localflocks:
1429                         /*
1430                          * Changing this during remount could race
1431                          * flock() requests, or "unbalance" existing
1432                          * ones (e.g., a lock is taken in one mode but
1433                          * dropped in the other). If users care enough
1434                          * to flip locking modes during remount, we
1435                          * could add a "local" flag to individual
1436                          * flock structures for proper tracking of
1437                          * state.
1438                          */
1439                         if (!is_remount)
1440                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1441                         break;
1442                 case Opt_stack:
1443                         /* Check both that the option we were passed
1444                          * is of the right length and that it is a proper
1445                          * string of the right length.
1446                          */
1447                         if (((args[0].to - args[0].from) !=
1448                              OCFS2_STACK_LABEL_LEN) ||
1449                             (strnlen(args[0].from,
1450                                      OCFS2_STACK_LABEL_LEN) !=
1451                              OCFS2_STACK_LABEL_LEN)) {
1452                                 mlog(ML_ERROR,
1453                                      "Invalid cluster_stack option\n");
1454                                 status = 0;
1455                                 goto bail;
1456                         }
1457                         memcpy(mopt->cluster_stack, args[0].from,
1458                                OCFS2_STACK_LABEL_LEN);
1459                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1460                         break;
1461                 case Opt_inode64:
1462                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1463                         break;
1464                 case Opt_usrquota:
1465                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1466                         break;
1467                 case Opt_grpquota:
1468                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1469                         break;
1470                 case Opt_coherency_buffered:
1471                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1472                         break;
1473                 case Opt_coherency_full:
1474                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1475                         break;
1476                 case Opt_acl:
1477                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1478                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1479                         break;
1480                 case Opt_noacl:
1481                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1482                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1483                         break;
1484                 case Opt_resv_level:
1485                         if (is_remount)
1486                                 break;
1487                         if (match_int(&args[0], &option)) {
1488                                 status = 0;
1489                                 goto bail;
1490                         }
1491                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1492                             option < OCFS2_MAX_RESV_LEVEL)
1493                                 mopt->resv_level = option;
1494                         break;
1495                 case Opt_dir_resv_level:
1496                         if (is_remount)
1497                                 break;
1498                         if (match_int(&args[0], &option)) {
1499                                 status = 0;
1500                                 goto bail;
1501                         }
1502                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1503                             option < OCFS2_MAX_RESV_LEVEL)
1504                                 mopt->dir_resv_level = option;
1505                         break;
1506                 default:
1507                         mlog(ML_ERROR,
1508                              "Unrecognized mount option \"%s\" "
1509                              "or missing value\n", p);
1510                         status = 0;
1511                         goto bail;
1512                 }
1513         }
1514
1515         /* Ensure only one heartbeat mode */
1516         tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
1517                                  OCFS2_MOUNT_HB_NONE);
1518         if (hweight32(tmp) != 1) {
1519                 mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1520                 status = 0;
1521                 goto bail;
1522         }
1523
1524         status = 1;
1525
1526 bail:
1527         mlog_exit(status);
1528         return status;
1529 }
1530
1531 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1532 {
1533         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1534         unsigned long opts = osb->s_mount_opt;
1535         unsigned int local_alloc_megs;
1536
1537         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1538                 seq_printf(s, ",_netdev");
1539                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1540                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1541                 else
1542                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1543         } else
1544                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1545
1546         if (opts & OCFS2_MOUNT_NOINTR)
1547                 seq_printf(s, ",nointr");
1548
1549         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1550                 seq_printf(s, ",data=writeback");
1551         else
1552                 seq_printf(s, ",data=ordered");
1553
1554         if (opts & OCFS2_MOUNT_BARRIER)
1555                 seq_printf(s, ",barrier=1");
1556
1557         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1558                 seq_printf(s, ",errors=panic");
1559         else
1560                 seq_printf(s, ",errors=remount-ro");
1561
1562         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1563                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1564
1565         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1566                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1567
1568         if (osb->osb_commit_interval)
1569                 seq_printf(s, ",commit=%u",
1570                            (unsigned) (osb->osb_commit_interval / HZ));
1571
1572         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1573         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1574                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1575
1576         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1577                 seq_printf(s, ",localflocks,");
1578
1579         if (osb->osb_cluster_stack[0])
1580                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1581                            osb->osb_cluster_stack);
1582         if (opts & OCFS2_MOUNT_USRQUOTA)
1583                 seq_printf(s, ",usrquota");
1584         if (opts & OCFS2_MOUNT_GRPQUOTA)
1585                 seq_printf(s, ",grpquota");
1586
1587         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1588                 seq_printf(s, ",coherency=buffered");
1589         else
1590                 seq_printf(s, ",coherency=full");
1591
1592         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1593                 seq_printf(s, ",nouser_xattr");
1594         else
1595                 seq_printf(s, ",user_xattr");
1596
1597         if (opts & OCFS2_MOUNT_INODE64)
1598                 seq_printf(s, ",inode64");
1599
1600         if (opts & OCFS2_MOUNT_POSIX_ACL)
1601                 seq_printf(s, ",acl");
1602         else
1603                 seq_printf(s, ",noacl");
1604
1605         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1606                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1607
1608         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1609                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1610
1611         return 0;
1612 }
1613
1614 static int __init ocfs2_init(void)
1615 {
1616         int status;
1617
1618         mlog_entry_void();
1619
1620         ocfs2_print_version();
1621
1622         status = init_ocfs2_uptodate_cache();
1623         if (status < 0) {
1624                 mlog_errno(status);
1625                 goto leave;
1626         }
1627
1628         status = ocfs2_initialize_mem_caches();
1629         if (status < 0) {
1630                 mlog_errno(status);
1631                 goto leave;
1632         }
1633
1634         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1635         if (!ocfs2_wq) {
1636                 status = -ENOMEM;
1637                 goto leave;
1638         }
1639
1640         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1641         if (!ocfs2_debugfs_root) {
1642                 status = -EFAULT;
1643                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1644         }
1645
1646         status = ocfs2_quota_setup();
1647         if (status)
1648                 goto leave;
1649
1650         ocfs2_set_locking_protocol();
1651
1652         status = register_quota_format(&ocfs2_quota_format);
1653 leave:
1654         if (status < 0) {
1655                 ocfs2_quota_shutdown();
1656                 ocfs2_free_mem_caches();
1657                 exit_ocfs2_uptodate_cache();
1658         }
1659
1660         mlog_exit(status);
1661
1662         if (status >= 0) {
1663                 return register_filesystem(&ocfs2_fs_type);
1664         } else
1665                 return -1;
1666 }
1667
1668 static void __exit ocfs2_exit(void)
1669 {
1670         mlog_entry_void();
1671
1672         ocfs2_quota_shutdown();
1673
1674         if (ocfs2_wq) {
1675                 flush_workqueue(ocfs2_wq);
1676                 destroy_workqueue(ocfs2_wq);
1677         }
1678
1679         unregister_quota_format(&ocfs2_quota_format);
1680
1681         debugfs_remove(ocfs2_debugfs_root);
1682
1683         ocfs2_free_mem_caches();
1684
1685         unregister_filesystem(&ocfs2_fs_type);
1686
1687         exit_ocfs2_uptodate_cache();
1688
1689         mlog_exit_void();
1690 }
1691
1692 static void ocfs2_put_super(struct super_block *sb)
1693 {
1694         mlog_entry("(0x%p)\n", sb);
1695
1696         ocfs2_sync_blockdev(sb);
1697         ocfs2_dismount_volume(sb, 0);
1698
1699         mlog_exit_void();
1700 }
1701
1702 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1703 {
1704         struct ocfs2_super *osb;
1705         u32 numbits, freebits;
1706         int status;
1707         struct ocfs2_dinode *bm_lock;
1708         struct buffer_head *bh = NULL;
1709         struct inode *inode = NULL;
1710
1711         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1712
1713         osb = OCFS2_SB(dentry->d_sb);
1714
1715         inode = ocfs2_get_system_file_inode(osb,
1716                                             GLOBAL_BITMAP_SYSTEM_INODE,
1717                                             OCFS2_INVALID_SLOT);
1718         if (!inode) {
1719                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1720                 status = -EIO;
1721                 goto bail;
1722         }
1723
1724         status = ocfs2_inode_lock(inode, &bh, 0);
1725         if (status < 0) {
1726                 mlog_errno(status);
1727                 goto bail;
1728         }
1729
1730         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1731
1732         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1733         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1734
1735         buf->f_type = OCFS2_SUPER_MAGIC;
1736         buf->f_bsize = dentry->d_sb->s_blocksize;
1737         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1738         buf->f_blocks = ((sector_t) numbits) *
1739                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1740         buf->f_bfree = ((sector_t) freebits) *
1741                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1742         buf->f_bavail = buf->f_bfree;
1743         buf->f_files = numbits;
1744         buf->f_ffree = freebits;
1745         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1746                                 & 0xFFFFFFFFUL;
1747         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1748                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1749
1750         brelse(bh);
1751
1752         ocfs2_inode_unlock(inode, 0);
1753         status = 0;
1754 bail:
1755         if (inode)
1756                 iput(inode);
1757
1758         mlog_exit(status);
1759
1760         return status;
1761 }
1762
1763 static void ocfs2_inode_init_once(void *data)
1764 {
1765         struct ocfs2_inode_info *oi = data;
1766
1767         oi->ip_flags = 0;
1768         oi->ip_open_count = 0;
1769         spin_lock_init(&oi->ip_lock);
1770         ocfs2_extent_map_init(&oi->vfs_inode);
1771         INIT_LIST_HEAD(&oi->ip_io_markers);
1772         oi->ip_dir_start_lookup = 0;
1773
1774         init_rwsem(&oi->ip_alloc_sem);
1775         init_rwsem(&oi->ip_xattr_sem);
1776         mutex_init(&oi->ip_io_mutex);
1777
1778         oi->ip_blkno = 0ULL;
1779         oi->ip_clusters = 0;
1780
1781         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1782
1783         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1784         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1785         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1786
1787         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1788                                   &ocfs2_inode_caching_ops);
1789
1790         inode_init_once(&oi->vfs_inode);
1791 }
1792
1793 static int ocfs2_initialize_mem_caches(void)
1794 {
1795         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1796                                        sizeof(struct ocfs2_inode_info),
1797                                        0,
1798                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1799                                                 SLAB_MEM_SPREAD),
1800                                        ocfs2_inode_init_once);
1801         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1802                                         sizeof(struct ocfs2_dquot),
1803                                         0,
1804                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1805                                                 SLAB_MEM_SPREAD),
1806                                         NULL);
1807         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1808                                         sizeof(struct ocfs2_quota_chunk),
1809                                         0,
1810                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1811                                         NULL);
1812         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1813             !ocfs2_qf_chunk_cachep) {
1814                 if (ocfs2_inode_cachep)
1815                         kmem_cache_destroy(ocfs2_inode_cachep);
1816                 if (ocfs2_dquot_cachep)
1817                         kmem_cache_destroy(ocfs2_dquot_cachep);
1818                 if (ocfs2_qf_chunk_cachep)
1819                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1820                 return -ENOMEM;
1821         }
1822
1823         return 0;
1824 }
1825
1826 static void ocfs2_free_mem_caches(void)
1827 {
1828         if (ocfs2_inode_cachep)
1829                 kmem_cache_destroy(ocfs2_inode_cachep);
1830         ocfs2_inode_cachep = NULL;
1831
1832         if (ocfs2_dquot_cachep)
1833                 kmem_cache_destroy(ocfs2_dquot_cachep);
1834         ocfs2_dquot_cachep = NULL;
1835
1836         if (ocfs2_qf_chunk_cachep)
1837                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1838         ocfs2_qf_chunk_cachep = NULL;
1839 }
1840
1841 static int ocfs2_get_sector(struct super_block *sb,
1842                             struct buffer_head **bh,
1843                             int block,
1844                             int sect_size)
1845 {
1846         if (!sb_set_blocksize(sb, sect_size)) {
1847                 mlog(ML_ERROR, "unable to set blocksize\n");
1848                 return -EIO;
1849         }
1850
1851         *bh = sb_getblk(sb, block);
1852         if (!*bh) {
1853                 mlog_errno(-EIO);
1854                 return -EIO;
1855         }
1856         lock_buffer(*bh);
1857         if (!buffer_dirty(*bh))
1858                 clear_buffer_uptodate(*bh);
1859         unlock_buffer(*bh);
1860         ll_rw_block(READ, 1, bh);
1861         wait_on_buffer(*bh);
1862         if (!buffer_uptodate(*bh)) {
1863                 mlog_errno(-EIO);
1864                 brelse(*bh);
1865                 *bh = NULL;
1866                 return -EIO;
1867         }
1868
1869         return 0;
1870 }
1871
1872 static int ocfs2_mount_volume(struct super_block *sb)
1873 {
1874         int status = 0;
1875         int unlock_super = 0;
1876         struct ocfs2_super *osb = OCFS2_SB(sb);
1877
1878         mlog_entry_void();
1879
1880         if (ocfs2_is_hard_readonly(osb))
1881                 goto leave;
1882
1883         status = ocfs2_dlm_init(osb);
1884         if (status < 0) {
1885                 mlog_errno(status);
1886                 goto leave;
1887         }
1888
1889         status = ocfs2_super_lock(osb, 1);
1890         if (status < 0) {
1891                 mlog_errno(status);
1892                 goto leave;
1893         }
1894         unlock_super = 1;
1895
1896         /* This will load up the node map and add ourselves to it. */
1897         status = ocfs2_find_slot(osb);
1898         if (status < 0) {
1899                 mlog_errno(status);
1900                 goto leave;
1901         }
1902
1903         /* load all node-local system inodes */
1904         status = ocfs2_init_local_system_inodes(osb);
1905         if (status < 0) {
1906                 mlog_errno(status);
1907                 goto leave;
1908         }
1909
1910         status = ocfs2_check_volume(osb);
1911         if (status < 0) {
1912                 mlog_errno(status);
1913                 goto leave;
1914         }
1915
1916         status = ocfs2_truncate_log_init(osb);
1917         if (status < 0)
1918                 mlog_errno(status);
1919
1920 leave:
1921         if (unlock_super)
1922                 ocfs2_super_unlock(osb, 1);
1923
1924         mlog_exit(status);
1925         return status;
1926 }
1927
1928 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1929 {
1930         int tmp, hangup_needed = 0;
1931         struct ocfs2_super *osb = NULL;
1932         char nodestr[8];
1933
1934         mlog_entry("(0x%p)\n", sb);
1935
1936         BUG_ON(!sb);
1937         osb = OCFS2_SB(sb);
1938         BUG_ON(!osb);
1939
1940         debugfs_remove(osb->osb_ctxt);
1941
1942         /*
1943          * Flush inode dropping work queue so that deletes are
1944          * performed while the filesystem is still working
1945          */
1946         ocfs2_drop_all_dl_inodes(osb);
1947
1948         /* Orphan scan should be stopped as early as possible */
1949         ocfs2_orphan_scan_stop(osb);
1950
1951         ocfs2_disable_quotas(osb);
1952
1953         ocfs2_shutdown_local_alloc(osb);
1954
1955         ocfs2_truncate_log_shutdown(osb);
1956
1957         /* This will disable recovery and flush any recovery work. */
1958         ocfs2_recovery_exit(osb);
1959
1960         ocfs2_journal_shutdown(osb);
1961
1962         ocfs2_sync_blockdev(sb);
1963
1964         ocfs2_purge_refcount_trees(osb);
1965
1966         /* No cluster connection means we've failed during mount, so skip
1967          * all the steps which depended on that to complete. */
1968         if (osb->cconn) {
1969                 tmp = ocfs2_super_lock(osb, 1);
1970                 if (tmp < 0) {
1971                         mlog_errno(tmp);
1972                         return;
1973                 }
1974         }
1975
1976         if (osb->slot_num != OCFS2_INVALID_SLOT)
1977                 ocfs2_put_slot(osb);
1978
1979         if (osb->cconn)
1980                 ocfs2_super_unlock(osb, 1);
1981
1982         ocfs2_release_system_inodes(osb);
1983
1984         /*
1985          * If we're dismounting due to mount error, mount.ocfs2 will clean
1986          * up heartbeat.  If we're a local mount, there is no heartbeat.
1987          * If we failed before we got a uuid_str yet, we can't stop
1988          * heartbeat.  Otherwise, do it.
1989          */
1990         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1991                 hangup_needed = 1;
1992
1993         if (osb->cconn)
1994                 ocfs2_dlm_shutdown(osb, hangup_needed);
1995
1996         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1997         debugfs_remove(osb->osb_debug_root);
1998
1999         if (hangup_needed)
2000                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
2001
2002         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
2003
2004         if (ocfs2_mount_local(osb))
2005                 snprintf(nodestr, sizeof(nodestr), "local");
2006         else
2007                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
2008
2009         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
2010                osb->dev_str, nodestr);
2011
2012         ocfs2_delete_osb(osb);
2013         kfree(osb);
2014         sb->s_dev = 0;
2015         sb->s_fs_info = NULL;
2016 }
2017
2018 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2019                                 unsigned uuid_bytes)
2020 {
2021         int i, ret;
2022         char *ptr;
2023
2024         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2025
2026         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2027         if (osb->uuid_str == NULL)
2028                 return -ENOMEM;
2029
2030         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2031                 /* print with null */
2032                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
2033                 if (ret != 2) /* drop super cleans up */
2034                         return -EINVAL;
2035                 /* then only advance past the last char */
2036                 ptr += 2;
2037         }
2038
2039         return 0;
2040 }
2041
2042 /* Make sure entire volume is addressable by our journal.  Requires
2043    osb_clusters_at_boot to be valid and for the journal to have been
2044    initialized by ocfs2_journal_init(). */
2045 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2046 {
2047         int status = 0;
2048         u64 max_block =
2049                 ocfs2_clusters_to_blocks(osb->sb,
2050                                          osb->osb_clusters_at_boot) - 1;
2051
2052         /* 32-bit block number is always OK. */
2053         if (max_block <= (u32)~0ULL)
2054                 goto out;
2055
2056         /* Volume is "huge", so see if our journal is new enough to
2057            support it. */
2058         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2059                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2060               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2061                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2062                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2063                      "Enable the 'block64' journal option with tunefs.ocfs2");
2064                 status = -EFBIG;
2065                 goto out;
2066         }
2067
2068  out:
2069         return status;
2070 }
2071
2072 static int ocfs2_initialize_super(struct super_block *sb,
2073                                   struct buffer_head *bh,
2074                                   int sector_size,
2075                                   struct ocfs2_blockcheck_stats *stats)
2076 {
2077         int status;
2078         int i, cbits, bbits;
2079         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2080         struct inode *inode = NULL;
2081         struct ocfs2_journal *journal;
2082         __le32 uuid_net_key;
2083         struct ocfs2_super *osb;
2084         u64 total_blocks;
2085
2086         mlog_entry_void();
2087
2088         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2089         if (!osb) {
2090                 status = -ENOMEM;
2091                 mlog_errno(status);
2092                 goto bail;
2093         }
2094
2095         sb->s_fs_info = osb;
2096         sb->s_op = &ocfs2_sops;
2097         sb->s_export_op = &ocfs2_export_ops;
2098         sb->s_qcop = &ocfs2_quotactl_ops;
2099         sb->dq_op = &ocfs2_quota_operations;
2100         sb->s_xattr = ocfs2_xattr_handlers;
2101         sb->s_time_gran = 1;
2102         sb->s_flags |= MS_NOATIME;
2103         /* this is needed to support O_LARGEFILE */
2104         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2105         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2106         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2107
2108         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2109
2110         for (i = 0; i < 3; i++)
2111                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2112         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2113
2114         osb->sb = sb;
2115         /* Save off for ocfs2_rw_direct */
2116         osb->s_sectsize_bits = blksize_bits(sector_size);
2117         BUG_ON(!osb->s_sectsize_bits);
2118
2119         spin_lock_init(&osb->dc_task_lock);
2120         init_waitqueue_head(&osb->dc_event);
2121         osb->dc_work_sequence = 0;
2122         osb->dc_wake_sequence = 0;
2123         INIT_LIST_HEAD(&osb->blocked_lock_list);
2124         osb->blocked_lock_count = 0;
2125         spin_lock_init(&osb->osb_lock);
2126         spin_lock_init(&osb->osb_xattr_lock);
2127         ocfs2_init_steal_slots(osb);
2128
2129         atomic_set(&osb->alloc_stats.moves, 0);
2130         atomic_set(&osb->alloc_stats.local_data, 0);
2131         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2132         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2133         atomic_set(&osb->alloc_stats.bg_extends, 0);
2134
2135         /* Copy the blockcheck stats from the superblock probe */
2136         osb->osb_ecc_stats = *stats;
2137
2138         ocfs2_init_node_maps(osb);
2139
2140         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2141                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2142
2143         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2144         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2145                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2146                      osb->max_slots);
2147                 status = -EINVAL;
2148                 goto bail;
2149         }
2150         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2151
2152         ocfs2_orphan_scan_init(osb);
2153
2154         status = ocfs2_recovery_init(osb);
2155         if (status) {
2156                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2157                 mlog_errno(status);
2158                 goto bail;
2159         }
2160
2161         init_waitqueue_head(&osb->checkpoint_event);
2162         atomic_set(&osb->needs_checkpoint, 0);
2163
2164         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2165
2166         osb->slot_num = OCFS2_INVALID_SLOT;
2167
2168         osb->s_xattr_inline_size = le16_to_cpu(
2169                                         di->id2.i_super.s_xattr_inline_size);
2170
2171         osb->local_alloc_state = OCFS2_LA_UNUSED;
2172         osb->local_alloc_bh = NULL;
2173         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2174
2175         init_waitqueue_head(&osb->osb_mount_event);
2176
2177         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2178         if (status) {
2179                 mlog_errno(status);
2180                 goto bail;
2181         }
2182
2183         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2184         if (!osb->vol_label) {
2185                 mlog(ML_ERROR, "unable to alloc vol label\n");
2186                 status = -ENOMEM;
2187                 goto bail;
2188         }
2189
2190         osb->slot_recovery_generations =
2191                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2192                         GFP_KERNEL);
2193         if (!osb->slot_recovery_generations) {
2194                 status = -ENOMEM;
2195                 mlog_errno(status);
2196                 goto bail;
2197         }
2198
2199         init_waitqueue_head(&osb->osb_wipe_event);
2200         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2201                                         sizeof(*osb->osb_orphan_wipes),
2202                                         GFP_KERNEL);
2203         if (!osb->osb_orphan_wipes) {
2204                 status = -ENOMEM;
2205                 mlog_errno(status);
2206                 goto bail;
2207         }
2208
2209         osb->osb_rf_lock_tree = RB_ROOT;
2210
2211         osb->s_feature_compat =
2212                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2213         osb->s_feature_ro_compat =
2214                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2215         osb->s_feature_incompat =
2216                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2217
2218         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2219                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2220                      "optional features (%x).\n", i);
2221                 status = -EINVAL;
2222                 goto bail;
2223         }
2224         if (!(osb->sb->s_flags & MS_RDONLY) &&
2225             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2226                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2227                      "unsupported optional features (%x).\n", i);
2228                 status = -EINVAL;
2229                 goto bail;
2230         }
2231
2232         if (ocfs2_clusterinfo_valid(osb)) {
2233                 osb->osb_stackflags =
2234                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2235                 memcpy(osb->osb_cluster_stack,
2236                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2237                        OCFS2_STACK_LABEL_LEN);
2238                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2239                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2240                         mlog(ML_ERROR,
2241                              "couldn't mount because of an invalid "
2242                              "cluster stack label (%s) \n",
2243                              osb->osb_cluster_stack);
2244                         status = -EINVAL;
2245                         goto bail;
2246                 }
2247         } else {
2248                 /* The empty string is identical with classic tools that
2249                  * don't know about s_cluster_info. */
2250                 osb->osb_cluster_stack[0] = '\0';
2251         }
2252
2253         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2254
2255         /* FIXME
2256          * This should be done in ocfs2_journal_init(), but unknown
2257          * ordering issues will cause the filesystem to crash.
2258          * If anyone wants to figure out what part of the code
2259          * refers to osb->journal before ocfs2_journal_init() is run,
2260          * be my guest.
2261          */
2262         /* initialize our journal structure */
2263
2264         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2265         if (!journal) {
2266                 mlog(ML_ERROR, "unable to alloc journal\n");
2267                 status = -ENOMEM;
2268                 goto bail;
2269         }
2270         osb->journal = journal;
2271         journal->j_osb = osb;
2272
2273         atomic_set(&journal->j_num_trans, 0);
2274         init_rwsem(&journal->j_trans_barrier);
2275         init_waitqueue_head(&journal->j_checkpointed);
2276         spin_lock_init(&journal->j_lock);
2277         journal->j_trans_id = (unsigned long) 1;
2278         INIT_LIST_HEAD(&journal->j_la_cleanups);
2279         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2280         journal->j_state = OCFS2_JOURNAL_FREE;
2281
2282         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2283         osb->dentry_lock_list = NULL;
2284
2285         /* get some pseudo constants for clustersize bits */
2286         osb->s_clustersize_bits =
2287                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2288         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2289         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2290
2291         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2292             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2293                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2294                      osb->s_clustersize);
2295                 status = -EINVAL;
2296                 goto bail;
2297         }
2298
2299         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2300                                                 le32_to_cpu(di->i_clusters));
2301
2302         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2303                                            total_blocks);
2304         if (status) {
2305                 mlog(ML_ERROR, "Volume too large "
2306                      "to mount safely on this system");
2307                 status = -EFBIG;
2308                 goto bail;
2309         }
2310
2311         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2312                                  sizeof(di->id2.i_super.s_uuid))) {
2313                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2314                 status = -ENOMEM;
2315                 goto bail;
2316         }
2317
2318         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2319
2320         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2321         osb->vol_label[63] = '\0';
2322         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2323         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2324         osb->first_cluster_group_blkno =
2325                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2326         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2327         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2328         mlog(0, "vol_label: %s\n", osb->vol_label);
2329         mlog(0, "uuid: %s\n", osb->uuid_str);
2330         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2331              (unsigned long long)osb->root_blkno,
2332              (unsigned long long)osb->system_dir_blkno);
2333
2334         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2335         if (!osb->osb_dlm_debug) {
2336                 status = -ENOMEM;
2337                 mlog_errno(status);
2338                 goto bail;
2339         }
2340
2341         atomic_set(&osb->vol_state, VOLUME_INIT);
2342
2343         /* load root, system_dir, and all global system inodes */
2344         status = ocfs2_init_global_system_inodes(osb);
2345         if (status < 0) {
2346                 mlog_errno(status);
2347                 goto bail;
2348         }
2349
2350         /*
2351          * global bitmap
2352          */
2353         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2354                                             OCFS2_INVALID_SLOT);
2355         if (!inode) {
2356                 status = -EINVAL;
2357                 mlog_errno(status);
2358                 goto bail;
2359         }
2360
2361         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2362         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2363         iput(inode);
2364
2365         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2366                                  osb->s_feature_incompat) * 8;
2367
2368         status = ocfs2_init_slot_info(osb);
2369         if (status < 0) {
2370                 mlog_errno(status);
2371                 goto bail;
2372         }
2373
2374 bail:
2375         mlog_exit(status);
2376         return status;
2377 }
2378
2379 /*
2380  * will return: -EAGAIN if it is ok to keep searching for superblocks
2381  *              -EINVAL if there is a bad superblock
2382  *              0 on success
2383  */
2384 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2385                                struct buffer_head *bh,
2386                                u32 blksz,
2387                                struct ocfs2_blockcheck_stats *stats)
2388 {
2389         int status = -EAGAIN;
2390
2391         mlog_entry_void();
2392
2393         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2394                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2395                 /* We have to do a raw check of the feature here */
2396                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2397                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2398                         status = ocfs2_block_check_validate(bh->b_data,
2399                                                             bh->b_size,
2400                                                             &di->i_check,
2401                                                             stats);
2402                         if (status)
2403                                 goto out;
2404                 }
2405                 status = -EINVAL;
2406                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2407                         mlog(ML_ERROR, "found superblock with incorrect block "
2408                              "size: found %u, should be %u\n",
2409                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2410                                blksz);
2411                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2412                            OCFS2_MAJOR_REV_LEVEL ||
2413                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2414                            OCFS2_MINOR_REV_LEVEL) {
2415                         mlog(ML_ERROR, "found superblock with bad version: "
2416                              "found %u.%u, should be %u.%u\n",
2417                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2418                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2419                              OCFS2_MAJOR_REV_LEVEL,
2420                              OCFS2_MINOR_REV_LEVEL);
2421                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2422                         mlog(ML_ERROR, "bad block number on superblock: "
2423                              "found %llu, should be %llu\n",
2424                              (unsigned long long)le64_to_cpu(di->i_blkno),
2425                              (unsigned long long)bh->b_blocknr);
2426                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2427                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2428                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2429                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2430                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2431                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2432                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2433                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2434                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2435                         mlog(ML_ERROR,
2436                              "Superblock slots found greater than file system "
2437                              "maximum: found %u, max %u\n",
2438                              le16_to_cpu(di->id2.i_super.s_max_slots),
2439                              OCFS2_MAX_SLOTS);
2440                 } else {
2441                         /* found it! */
2442                         status = 0;
2443                 }
2444         }
2445
2446 out:
2447         mlog_exit(status);
2448         return status;
2449 }
2450
2451 static int ocfs2_check_volume(struct ocfs2_super *osb)
2452 {
2453         int status;
2454         int dirty;
2455         int local;
2456         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2457                                                   * recover
2458                                                   * ourselves. */
2459
2460         mlog_entry_void();
2461
2462         /* Init our journal object. */
2463         status = ocfs2_journal_init(osb->journal, &dirty);
2464         if (status < 0) {
2465                 mlog(ML_ERROR, "Could not initialize journal!\n");
2466                 goto finally;
2467         }
2468
2469         /* Now that journal has been initialized, check to make sure
2470            entire volume is addressable. */
2471         status = ocfs2_journal_addressable(osb);
2472         if (status)
2473                 goto finally;
2474
2475         /* If the journal was unmounted cleanly then we don't want to
2476          * recover anything. Otherwise, journal_load will do that
2477          * dirty work for us :) */
2478         if (!dirty) {
2479                 status = ocfs2_journal_wipe(osb->journal, 0);
2480                 if (status < 0) {
2481                         mlog_errno(status);
2482                         goto finally;
2483                 }
2484         } else {
2485                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2486                      "recovering volume.\n");
2487         }
2488
2489         local = ocfs2_mount_local(osb);
2490
2491         /* will play back anything left in the journal. */
2492         status = ocfs2_journal_load(osb->journal, local, dirty);
2493         if (status < 0) {
2494                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2495                 goto finally;
2496         }
2497
2498         if (dirty) {
2499                 /* recover my local alloc if we didn't unmount cleanly. */
2500                 status = ocfs2_begin_local_alloc_recovery(osb,
2501                                                           osb->slot_num,
2502                                                           &local_alloc);
2503                 if (status < 0) {
2504                         mlog_errno(status);
2505                         goto finally;
2506                 }
2507                 /* we complete the recovery process after we've marked
2508                  * ourselves as mounted. */
2509         }
2510
2511         mlog(0, "Journal loaded.\n");
2512
2513         status = ocfs2_load_local_alloc(osb);
2514         if (status < 0) {
2515                 mlog_errno(status);
2516                 goto finally;
2517         }
2518
2519         if (dirty) {
2520                 /* Recovery will be completed after we've mounted the
2521                  * rest of the volume. */
2522                 osb->dirty = 1;
2523                 osb->local_alloc_copy = local_alloc;
2524                 local_alloc = NULL;
2525         }
2526
2527         /* go through each journal, trylock it and if you get the
2528          * lock, and it's marked as dirty, set the bit in the recover
2529          * map and launch a recovery thread for it. */
2530         status = ocfs2_mark_dead_nodes(osb);
2531         if (status < 0) {
2532                 mlog_errno(status);
2533                 goto finally;
2534         }
2535
2536         status = ocfs2_compute_replay_slots(osb);
2537         if (status < 0)
2538                 mlog_errno(status);
2539
2540 finally:
2541         if (local_alloc)
2542                 kfree(local_alloc);
2543
2544         mlog_exit(status);
2545         return status;
2546 }
2547
2548 /*
2549  * The routine gets called from dismount or close whenever a dismount on
2550  * volume is requested and the osb open count becomes 1.
2551  * It will remove the osb from the global list and also free up all the
2552  * initialized resources and fileobject.
2553  */
2554 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2555 {
2556         mlog_entry_void();
2557
2558         /* This function assumes that the caller has the main osb resource */
2559
2560         ocfs2_free_slot_info(osb);
2561
2562         kfree(osb->osb_orphan_wipes);
2563         kfree(osb->slot_recovery_generations);
2564         /* FIXME
2565          * This belongs in journal shutdown, but because we have to
2566          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2567          * we free it here.
2568          */
2569         kfree(osb->journal);
2570         if (osb->local_alloc_copy)
2571                 kfree(osb->local_alloc_copy);
2572         kfree(osb->uuid_str);
2573         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2574         memset(osb, 0, sizeof(struct ocfs2_super));
2575
2576         mlog_exit_void();
2577 }
2578
2579 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2580  * panic(). We do not support continue-on-error operation. */
2581 static void ocfs2_handle_error(struct super_block *sb)
2582 {
2583         struct ocfs2_super *osb = OCFS2_SB(sb);
2584
2585         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2586                 panic("OCFS2: (device %s): panic forced after error\n",
2587                       sb->s_id);
2588
2589         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2590
2591         if (sb->s_flags & MS_RDONLY &&
2592             (ocfs2_is_soft_readonly(osb) ||
2593              ocfs2_is_hard_readonly(osb)))
2594                 return;
2595
2596         printk(KERN_CRIT "File system is now read-only due to the potential "
2597                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2598                "system is unmounted.\n");
2599         sb->s_flags |= MS_RDONLY;
2600         ocfs2_set_ro_flag(osb, 0);
2601 }
2602
2603 static char error_buf[1024];
2604
2605 void __ocfs2_error(struct super_block *sb,
2606                    const char *function,
2607                    const char *fmt, ...)
2608 {
2609         va_list args;
2610
2611         va_start(args, fmt);
2612         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2613         va_end(args);
2614
2615         /* Not using mlog here because we want to show the actual
2616          * function the error came from. */
2617         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2618                sb->s_id, function, error_buf);
2619
2620         ocfs2_handle_error(sb);
2621 }
2622
2623 /* Handle critical errors. This is intentionally more drastic than
2624  * ocfs2_handle_error, so we only use for things like journal errors,
2625  * etc. */
2626 void __ocfs2_abort(struct super_block* sb,
2627                    const char *function,
2628                    const char *fmt, ...)
2629 {
2630         va_list args;
2631
2632         va_start(args, fmt);
2633         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2634         va_end(args);
2635
2636         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2637                sb->s_id, function, error_buf);
2638
2639         /* We don't have the cluster support yet to go straight to
2640          * hard readonly in here. Until then, we want to keep
2641          * ocfs2_abort() so that we can at least mark critical
2642          * errors.
2643          *
2644          * TODO: This should abort the journal and alert other nodes
2645          * that our slot needs recovery. */
2646
2647         /* Force a panic(). This stinks, but it's better than letting
2648          * things continue without having a proper hard readonly
2649          * here. */
2650         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2651                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2652         ocfs2_handle_error(sb);
2653 }
2654
2655 /*
2656  * Void signal blockers, because in-kernel sigprocmask() only fails
2657  * when SIG_* is wrong.
2658  */
2659 void ocfs2_block_signals(sigset_t *oldset)
2660 {
2661         int rc;
2662         sigset_t blocked;
2663
2664         sigfillset(&blocked);
2665         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2666         BUG_ON(rc);
2667 }
2668
2669 void ocfs2_unblock_signals(sigset_t *oldset)
2670 {
2671         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2672         BUG_ON(rc);
2673 }
2674
2675 module_init(ocfs2_init);
2676 module_exit(ocfs2_exit);