ocfs2/trivial: Remove trailing whitespaces
[linux-2.6.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
73 #include "buffer_head_io.h"
74
75 static struct kmem_cache *ocfs2_inode_cachep = NULL;
76 struct kmem_cache *ocfs2_dquot_cachep;
77 struct kmem_cache *ocfs2_qf_chunk_cachep;
78
79 /* OCFS2 needs to schedule several differnt types of work which
80  * require cluster locking, disk I/O, recovery waits, etc. Since these
81  * types of work tend to be heavy we avoid using the kernel events
82  * workqueue and schedule on our own. */
83 struct workqueue_struct *ocfs2_wq = NULL;
84
85 static struct dentry *ocfs2_debugfs_root = NULL;
86
87 MODULE_AUTHOR("Oracle");
88 MODULE_LICENSE("GPL");
89
90 struct mount_options
91 {
92         unsigned long   commit_interval;
93         unsigned long   mount_opt;
94         unsigned int    atime_quantum;
95         signed short    slot;
96         unsigned int    localalloc_opt;
97         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
98 };
99
100 static int ocfs2_parse_options(struct super_block *sb, char *options,
101                                struct mount_options *mopt,
102                                int is_remount);
103 static int ocfs2_check_set_options(struct super_block *sb,
104                                    struct mount_options *options);
105 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
106 static void ocfs2_put_super(struct super_block *sb);
107 static int ocfs2_mount_volume(struct super_block *sb);
108 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
109 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
110 static int ocfs2_initialize_mem_caches(void);
111 static void ocfs2_free_mem_caches(void);
112 static void ocfs2_delete_osb(struct ocfs2_super *osb);
113
114 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
115
116 static int ocfs2_sync_fs(struct super_block *sb, int wait);
117
118 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
119 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
120 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
121 static int ocfs2_check_volume(struct ocfs2_super *osb);
122 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
123                                struct buffer_head *bh,
124                                u32 sectsize,
125                                struct ocfs2_blockcheck_stats *stats);
126 static int ocfs2_initialize_super(struct super_block *sb,
127                                   struct buffer_head *bh,
128                                   int sector_size,
129                                   struct ocfs2_blockcheck_stats *stats);
130 static int ocfs2_get_sector(struct super_block *sb,
131                             struct buffer_head **bh,
132                             int block,
133                             int sect_size);
134 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
135 static void ocfs2_destroy_inode(struct inode *inode);
136 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
137 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
138 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
139
140 static const struct super_operations ocfs2_sops = {
141         .statfs         = ocfs2_statfs,
142         .alloc_inode    = ocfs2_alloc_inode,
143         .destroy_inode  = ocfs2_destroy_inode,
144         .drop_inode     = ocfs2_drop_inode,
145         .clear_inode    = ocfs2_clear_inode,
146         .delete_inode   = ocfs2_delete_inode,
147         .sync_fs        = ocfs2_sync_fs,
148         .put_super      = ocfs2_put_super,
149         .remount_fs     = ocfs2_remount,
150         .show_options   = ocfs2_show_options,
151         .quota_read     = ocfs2_quota_read,
152         .quota_write    = ocfs2_quota_write,
153 };
154
155 enum {
156         Opt_barrier,
157         Opt_err_panic,
158         Opt_err_ro,
159         Opt_intr,
160         Opt_nointr,
161         Opt_hb_none,
162         Opt_hb_local,
163         Opt_data_ordered,
164         Opt_data_writeback,
165         Opt_atime_quantum,
166         Opt_slot,
167         Opt_commit,
168         Opt_localalloc,
169         Opt_localflocks,
170         Opt_stack,
171         Opt_user_xattr,
172         Opt_nouser_xattr,
173         Opt_inode64,
174         Opt_acl,
175         Opt_noacl,
176         Opt_usrquota,
177         Opt_grpquota,
178         Opt_err,
179 };
180
181 static const match_table_t tokens = {
182         {Opt_barrier, "barrier=%u"},
183         {Opt_err_panic, "errors=panic"},
184         {Opt_err_ro, "errors=remount-ro"},
185         {Opt_intr, "intr"},
186         {Opt_nointr, "nointr"},
187         {Opt_hb_none, OCFS2_HB_NONE},
188         {Opt_hb_local, OCFS2_HB_LOCAL},
189         {Opt_data_ordered, "data=ordered"},
190         {Opt_data_writeback, "data=writeback"},
191         {Opt_atime_quantum, "atime_quantum=%u"},
192         {Opt_slot, "preferred_slot=%u"},
193         {Opt_commit, "commit=%u"},
194         {Opt_localalloc, "localalloc=%d"},
195         {Opt_localflocks, "localflocks"},
196         {Opt_stack, "cluster_stack=%s"},
197         {Opt_user_xattr, "user_xattr"},
198         {Opt_nouser_xattr, "nouser_xattr"},
199         {Opt_inode64, "inode64"},
200         {Opt_acl, "acl"},
201         {Opt_noacl, "noacl"},
202         {Opt_usrquota, "usrquota"},
203         {Opt_grpquota, "grpquota"},
204         {Opt_err, NULL}
205 };
206
207 #ifdef CONFIG_DEBUG_FS
208 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
209 {
210         struct ocfs2_cluster_connection *cconn = osb->cconn;
211         struct ocfs2_recovery_map *rm = osb->recovery_map;
212         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
213         int i, out = 0;
214
215         out += snprintf(buf + out, len - out,
216                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
217                         "Device", osb->dev_str, osb->uuid_str,
218                         osb->fs_generation, osb->vol_label);
219
220         out += snprintf(buf + out, len - out,
221                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
222                         atomic_read(&osb->vol_state), osb->osb_flags);
223
224         out += snprintf(buf + out, len - out,
225                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
226                         osb->sb->s_blocksize, osb->s_clustersize);
227
228         out += snprintf(buf + out, len - out,
229                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
230                         "ROcompat: 0x%X\n",
231                         "Features", osb->s_feature_compat,
232                         osb->s_feature_incompat, osb->s_feature_ro_compat);
233
234         out += snprintf(buf + out, len - out,
235                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
236                         osb->s_mount_opt, osb->s_atime_quantum);
237
238         if (cconn) {
239                 out += snprintf(buf + out, len - out,
240                                 "%10s => Stack: %s  Name: %*s  "
241                                 "Version: %d.%d\n", "Cluster",
242                                 (*osb->osb_cluster_stack == '\0' ?
243                                  "o2cb" : osb->osb_cluster_stack),
244                                 cconn->cc_namelen, cconn->cc_name,
245                                 cconn->cc_version.pv_major,
246                                 cconn->cc_version.pv_minor);
247         }
248
249         spin_lock(&osb->dc_task_lock);
250         out += snprintf(buf + out, len - out,
251                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
252                         "WorkSeq: %lu\n", "DownCnvt",
253                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
254                         osb->blocked_lock_count, osb->dc_wake_sequence,
255                         osb->dc_work_sequence);
256         spin_unlock(&osb->dc_task_lock);
257
258         spin_lock(&osb->osb_lock);
259         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
260                         "Recovery",
261                         (osb->recovery_thread_task ?
262                          task_pid_nr(osb->recovery_thread_task) : -1));
263         if (rm->rm_used == 0)
264                 out += snprintf(buf + out, len - out, " None\n");
265         else {
266                 for (i = 0; i < rm->rm_used; i++)
267                         out += snprintf(buf + out, len - out, " %d",
268                                         rm->rm_entries[i]);
269                 out += snprintf(buf + out, len - out, "\n");
270         }
271         spin_unlock(&osb->osb_lock);
272
273         out += snprintf(buf + out, len - out,
274                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
275                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
276                         osb->osb_commit_interval,
277                         atomic_read(&osb->needs_checkpoint));
278
279         out += snprintf(buf + out, len - out,
280                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
281                         "Journal", osb->journal->j_state,
282                         osb->journal->j_trans_id,
283                         atomic_read(&osb->journal->j_num_trans));
284
285         out += snprintf(buf + out, len - out,
286                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
287                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
288                         "Stats",
289                         atomic_read(&osb->alloc_stats.bitmap_data),
290                         atomic_read(&osb->alloc_stats.local_data),
291                         atomic_read(&osb->alloc_stats.bg_allocs),
292                         atomic_read(&osb->alloc_stats.moves),
293                         atomic_read(&osb->alloc_stats.bg_extends));
294
295         out += snprintf(buf + out, len - out,
296                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
297                         "Default: %u bits\n",
298                         "LocalAlloc", osb->local_alloc_state,
299                         (unsigned long long)osb->la_last_gd,
300                         osb->local_alloc_bits, osb->local_alloc_default_bits);
301
302         spin_lock(&osb->osb_lock);
303         out += snprintf(buf + out, len - out,
304                         "%10s => Slot: %d  NumStolen: %d\n", "Steal",
305                         osb->s_inode_steal_slot,
306                         atomic_read(&osb->s_num_inodes_stolen));
307         spin_unlock(&osb->osb_lock);
308
309         out += snprintf(buf + out, len - out, "OrphanScan => ");
310         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
311                         os->os_count, os->os_seqno);
312         out += snprintf(buf + out, len - out, " Last Scan: ");
313         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
314                 out += snprintf(buf + out, len - out, "Disabled\n");
315         else
316                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
317                                 (get_seconds() - os->os_scantime.tv_sec));
318
319         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
320                         "Slots", "Num", "RecoGen");
321         for (i = 0; i < osb->max_slots; ++i) {
322                 out += snprintf(buf + out, len - out,
323                                 "%10s  %c %3d  %10d\n",
324                                 " ",
325                                 (i == osb->slot_num ? '*' : ' '),
326                                 i, osb->slot_recovery_generations[i]);
327         }
328
329         return out;
330 }
331
332 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
333 {
334         struct ocfs2_super *osb = inode->i_private;
335         char *buf = NULL;
336
337         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
338         if (!buf)
339                 goto bail;
340
341         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
342
343         file->private_data = buf;
344
345         return 0;
346 bail:
347         return -ENOMEM;
348 }
349
350 static int ocfs2_debug_release(struct inode *inode, struct file *file)
351 {
352         kfree(file->private_data);
353         return 0;
354 }
355
356 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
357                                 size_t nbytes, loff_t *ppos)
358 {
359         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
360                                        i_size_read(file->f_mapping->host));
361 }
362 #else
363 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
364 {
365         return 0;
366 }
367 static int ocfs2_debug_release(struct inode *inode, struct file *file)
368 {
369         return 0;
370 }
371 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
372                                 size_t nbytes, loff_t *ppos)
373 {
374         return 0;
375 }
376 #endif  /* CONFIG_DEBUG_FS */
377
378 static const struct file_operations ocfs2_osb_debug_fops = {
379         .open =         ocfs2_osb_debug_open,
380         .release =      ocfs2_debug_release,
381         .read =         ocfs2_debug_read,
382         .llseek =       generic_file_llseek,
383 };
384
385 static int ocfs2_sync_fs(struct super_block *sb, int wait)
386 {
387         int status;
388         tid_t target;
389         struct ocfs2_super *osb = OCFS2_SB(sb);
390
391         if (ocfs2_is_hard_readonly(osb))
392                 return -EROFS;
393
394         if (wait) {
395                 status = ocfs2_flush_truncate_log(osb);
396                 if (status < 0)
397                         mlog_errno(status);
398         } else {
399                 ocfs2_schedule_truncate_log_flush(osb, 0);
400         }
401
402         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
403                                       &target)) {
404                 if (wait)
405                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
406                                              target);
407         }
408         return 0;
409 }
410
411 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
412 {
413         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
414             && (ino == USER_QUOTA_SYSTEM_INODE
415                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
416                 return 0;
417         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
418             && (ino == GROUP_QUOTA_SYSTEM_INODE
419                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
420                 return 0;
421         return 1;
422 }
423
424 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
425 {
426         struct inode *new = NULL;
427         int status = 0;
428         int i;
429
430         mlog_entry_void();
431
432         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
433         if (IS_ERR(new)) {
434                 status = PTR_ERR(new);
435                 mlog_errno(status);
436                 goto bail;
437         }
438         osb->root_inode = new;
439
440         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
441         if (IS_ERR(new)) {
442                 status = PTR_ERR(new);
443                 mlog_errno(status);
444                 goto bail;
445         }
446         osb->sys_root_inode = new;
447
448         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
449              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
450                 if (!ocfs2_need_system_inode(osb, i))
451                         continue;
452                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
453                 if (!new) {
454                         ocfs2_release_system_inodes(osb);
455                         status = -EINVAL;
456                         mlog_errno(status);
457                         /* FIXME: Should ERROR_RO_FS */
458                         mlog(ML_ERROR, "Unable to load system inode %d, "
459                              "possibly corrupt fs?", i);
460                         goto bail;
461                 }
462                 // the array now has one ref, so drop this one
463                 iput(new);
464         }
465
466 bail:
467         mlog_exit(status);
468         return status;
469 }
470
471 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
472 {
473         struct inode *new = NULL;
474         int status = 0;
475         int i;
476
477         mlog_entry_void();
478
479         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
480              i < NUM_SYSTEM_INODES;
481              i++) {
482                 if (!ocfs2_need_system_inode(osb, i))
483                         continue;
484                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
485                 if (!new) {
486                         ocfs2_release_system_inodes(osb);
487                         status = -EINVAL;
488                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
489                              status, i, osb->slot_num);
490                         goto bail;
491                 }
492                 /* the array now has one ref, so drop this one */
493                 iput(new);
494         }
495
496 bail:
497         mlog_exit(status);
498         return status;
499 }
500
501 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
502 {
503         int i;
504         struct inode *inode;
505
506         mlog_entry_void();
507
508         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
509                 inode = osb->system_inodes[i];
510                 if (inode) {
511                         iput(inode);
512                         osb->system_inodes[i] = NULL;
513                 }
514         }
515
516         inode = osb->sys_root_inode;
517         if (inode) {
518                 iput(inode);
519                 osb->sys_root_inode = NULL;
520         }
521
522         inode = osb->root_inode;
523         if (inode) {
524                 iput(inode);
525                 osb->root_inode = NULL;
526         }
527
528         mlog_exit(0);
529 }
530
531 /* We're allocating fs objects, use GFP_NOFS */
532 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
533 {
534         struct ocfs2_inode_info *oi;
535
536         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
537         if (!oi)
538                 return NULL;
539
540         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
541         return &oi->vfs_inode;
542 }
543
544 static void ocfs2_destroy_inode(struct inode *inode)
545 {
546         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
547 }
548
549 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
550                                                 unsigned int cbits)
551 {
552         unsigned int bytes = 1 << cbits;
553         unsigned int trim = bytes;
554         unsigned int bitshift = 32;
555
556         /*
557          * i_size and all block offsets in ocfs2 are always 64 bits
558          * wide. i_clusters is 32 bits, in cluster-sized units. So on
559          * 64 bit platforms, cluster size will be the limiting factor.
560          */
561
562 #if BITS_PER_LONG == 32
563 # if defined(CONFIG_LBDAF)
564         BUILD_BUG_ON(sizeof(sector_t) != 8);
565         /*
566          * We might be limited by page cache size.
567          */
568         if (bytes > PAGE_CACHE_SIZE) {
569                 bytes = PAGE_CACHE_SIZE;
570                 trim = 1;
571                 /*
572                  * Shift by 31 here so that we don't get larger than
573                  * MAX_LFS_FILESIZE
574                  */
575                 bitshift = 31;
576         }
577 # else
578         /*
579          * We are limited by the size of sector_t. Use block size, as
580          * that's what we expose to the VFS.
581          */
582         bytes = 1 << bbits;
583         trim = 1;
584         bitshift = 31;
585 # endif
586 #endif
587
588         /*
589          * Trim by a whole cluster when we can actually approach the
590          * on-disk limits. Otherwise we can overflow i_clusters when
591          * an extent start is at the max offset.
592          */
593         return (((unsigned long long)bytes) << bitshift) - trim;
594 }
595
596 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
597 {
598         int incompat_features;
599         int ret = 0;
600         struct mount_options parsed_options;
601         struct ocfs2_super *osb = OCFS2_SB(sb);
602
603         lock_kernel();
604
605         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
606             !ocfs2_check_set_options(sb, &parsed_options)) {
607                 ret = -EINVAL;
608                 goto out;
609         }
610
611         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
612             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
613                 ret = -EINVAL;
614                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
615                 goto out;
616         }
617
618         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
619             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
620                 ret = -EINVAL;
621                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
622                 goto out;
623         }
624
625         /* Probably don't want this on remount; it might
626          * mess with other nodes */
627         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
628             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
629                 ret = -EINVAL;
630                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
631                 goto out;
632         }
633
634         /* We're going to/from readonly mode. */
635         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
636                 /* Disable quota accounting before remounting RO */
637                 if (*flags & MS_RDONLY) {
638                         ret = ocfs2_susp_quotas(osb, 0);
639                         if (ret < 0)
640                                 goto out;
641                 }
642                 /* Lock here so the check of HARD_RO and the potential
643                  * setting of SOFT_RO is atomic. */
644                 spin_lock(&osb->osb_lock);
645                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
646                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
647                         ret = -EROFS;
648                         goto unlock_osb;
649                 }
650
651                 if (*flags & MS_RDONLY) {
652                         mlog(0, "Going to ro mode.\n");
653                         sb->s_flags |= MS_RDONLY;
654                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
655                 } else {
656                         mlog(0, "Making ro filesystem writeable.\n");
657
658                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
659                                 mlog(ML_ERROR, "Cannot remount RDWR "
660                                      "filesystem due to previous errors.\n");
661                                 ret = -EROFS;
662                                 goto unlock_osb;
663                         }
664                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
665                         if (incompat_features) {
666                                 mlog(ML_ERROR, "Cannot remount RDWR because "
667                                      "of unsupported optional features "
668                                      "(%x).\n", incompat_features);
669                                 ret = -EINVAL;
670                                 goto unlock_osb;
671                         }
672                         sb->s_flags &= ~MS_RDONLY;
673                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
674                 }
675 unlock_osb:
676                 spin_unlock(&osb->osb_lock);
677                 /* Enable quota accounting after remounting RW */
678                 if (!ret && !(*flags & MS_RDONLY)) {
679                         if (sb_any_quota_suspended(sb))
680                                 ret = ocfs2_susp_quotas(osb, 1);
681                         else
682                                 ret = ocfs2_enable_quotas(osb);
683                         if (ret < 0) {
684                                 /* Return back changes... */
685                                 spin_lock(&osb->osb_lock);
686                                 sb->s_flags |= MS_RDONLY;
687                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
688                                 spin_unlock(&osb->osb_lock);
689                                 goto out;
690                         }
691                 }
692         }
693
694         if (!ret) {
695                 /* Only save off the new mount options in case of a successful
696                  * remount. */
697                 osb->s_mount_opt = parsed_options.mount_opt;
698                 osb->s_atime_quantum = parsed_options.atime_quantum;
699                 osb->preferred_slot = parsed_options.slot;
700                 if (parsed_options.commit_interval)
701                         osb->osb_commit_interval = parsed_options.commit_interval;
702
703                 if (!ocfs2_is_hard_readonly(osb))
704                         ocfs2_set_journal_params(osb);
705
706                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
707                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
708                                                         MS_POSIXACL : 0);
709         }
710 out:
711         unlock_kernel();
712         return ret;
713 }
714
715 static int ocfs2_sb_probe(struct super_block *sb,
716                           struct buffer_head **bh,
717                           int *sector_size,
718                           struct ocfs2_blockcheck_stats *stats)
719 {
720         int status, tmpstat;
721         struct ocfs1_vol_disk_hdr *hdr;
722         struct ocfs2_dinode *di;
723         int blksize;
724
725         *bh = NULL;
726
727         /* may be > 512 */
728         *sector_size = bdev_logical_block_size(sb->s_bdev);
729         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
730                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
731                      *sector_size, OCFS2_MAX_BLOCKSIZE);
732                 status = -EINVAL;
733                 goto bail;
734         }
735
736         /* Can this really happen? */
737         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
738                 *sector_size = OCFS2_MIN_BLOCKSIZE;
739
740         /* check block zero for old format */
741         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
742         if (status < 0) {
743                 mlog_errno(status);
744                 goto bail;
745         }
746         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
747         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
748                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
749                      hdr->major_version, hdr->minor_version);
750                 status = -EINVAL;
751         }
752         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
753                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
754                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
755                      hdr->signature);
756                 status = -EINVAL;
757         }
758         brelse(*bh);
759         *bh = NULL;
760         if (status < 0) {
761                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
762                      "upgraded before mounting with ocfs v2\n");
763                 goto bail;
764         }
765
766         /*
767          * Now check at magic offset for 512, 1024, 2048, 4096
768          * blocksizes.  4096 is the maximum blocksize because it is
769          * the minimum clustersize.
770          */
771         status = -EINVAL;
772         for (blksize = *sector_size;
773              blksize <= OCFS2_MAX_BLOCKSIZE;
774              blksize <<= 1) {
775                 tmpstat = ocfs2_get_sector(sb, bh,
776                                            OCFS2_SUPER_BLOCK_BLKNO,
777                                            blksize);
778                 if (tmpstat < 0) {
779                         status = tmpstat;
780                         mlog_errno(status);
781                         break;
782                 }
783                 di = (struct ocfs2_dinode *) (*bh)->b_data;
784                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
785                 spin_lock_init(&stats->b_lock);
786                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
787                 if (tmpstat < 0) {
788                         brelse(*bh);
789                         *bh = NULL;
790                 }
791                 if (tmpstat != -EAGAIN) {
792                         status = tmpstat;
793                         break;
794                 }
795         }
796
797 bail:
798         return status;
799 }
800
801 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
802 {
803         if (ocfs2_mount_local(osb)) {
804                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
805                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
806                              "mounted device.\n");
807                         return -EINVAL;
808                 }
809         }
810
811         if (ocfs2_userspace_stack(osb)) {
812                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
813                         mlog(ML_ERROR, "Userspace stack expected, but "
814                              "o2cb heartbeat arguments passed to mount\n");
815                         return -EINVAL;
816                 }
817         }
818
819         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
820                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
821                     !ocfs2_userspace_stack(osb)) {
822                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
823                              "a read-write clustered device.\n");
824                         return -EINVAL;
825                 }
826         }
827
828         return 0;
829 }
830
831 /*
832  * If we're using a userspace stack, mount should have passed
833  * a name that matches the disk.  If not, mount should not
834  * have passed a stack.
835  */
836 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
837                                         struct mount_options *mopt)
838 {
839         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
840                 mlog(ML_ERROR,
841                      "cluster stack passed to mount, but this filesystem "
842                      "does not support it\n");
843                 return -EINVAL;
844         }
845
846         if (ocfs2_userspace_stack(osb) &&
847             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
848                     OCFS2_STACK_LABEL_LEN)) {
849                 mlog(ML_ERROR,
850                      "cluster stack passed to mount (\"%s\") does not "
851                      "match the filesystem (\"%s\")\n",
852                      mopt->cluster_stack,
853                      osb->osb_cluster_stack);
854                 return -EINVAL;
855         }
856
857         return 0;
858 }
859
860 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
861 {
862         int type;
863         struct super_block *sb = osb->sb;
864         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
865                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
866         int status = 0;
867
868         for (type = 0; type < MAXQUOTAS; type++) {
869                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
870                         continue;
871                 if (unsuspend)
872                         status = vfs_quota_enable(
873                                         sb_dqopt(sb)->files[type],
874                                         type, QFMT_OCFS2,
875                                         DQUOT_SUSPENDED);
876                 else
877                         status = vfs_quota_disable(sb, type,
878                                                    DQUOT_SUSPENDED);
879                 if (status < 0)
880                         break;
881         }
882         if (status < 0)
883                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
884                      "remount (error = %d).\n", status);
885         return status;
886 }
887
888 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
889 {
890         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
891         struct super_block *sb = osb->sb;
892         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
893                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
894         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
895                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
896         int status;
897         int type;
898
899         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
900         for (type = 0; type < MAXQUOTAS; type++) {
901                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
902                         continue;
903                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
904                                                         osb->slot_num);
905                 if (!inode[type]) {
906                         status = -ENOENT;
907                         goto out_quota_off;
908                 }
909                 status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
910                                                 DQUOT_USAGE_ENABLED);
911                 if (status < 0)
912                         goto out_quota_off;
913         }
914
915         for (type = 0; type < MAXQUOTAS; type++)
916                 iput(inode[type]);
917         return 0;
918 out_quota_off:
919         ocfs2_disable_quotas(osb);
920         for (type = 0; type < MAXQUOTAS; type++)
921                 iput(inode[type]);
922         mlog_errno(status);
923         return status;
924 }
925
926 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
927 {
928         int type;
929         struct inode *inode;
930         struct super_block *sb = osb->sb;
931
932         /* We mostly ignore errors in this function because there's not much
933          * we can do when we see them */
934         for (type = 0; type < MAXQUOTAS; type++) {
935                 if (!sb_has_quota_loaded(sb, type))
936                         continue;
937                 inode = igrab(sb->s_dquot.files[type]);
938                 /* Turn off quotas. This will remove all dquot structures from
939                  * memory and so they will be automatically synced to global
940                  * quota files */
941                 vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
942                                             DQUOT_LIMITS_ENABLED);
943                 if (!inode)
944                         continue;
945                 iput(inode);
946         }
947 }
948
949 /* Handle quota on quotactl */
950 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
951                           char *path, int remount)
952 {
953         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
954                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
955
956         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
957                 return -EINVAL;
958
959         if (remount)
960                 return 0;       /* Just ignore it has been handled in
961                                  * ocfs2_remount() */
962         return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
963                                     format_id, DQUOT_LIMITS_ENABLED);
964 }
965
966 /* Handle quota off quotactl */
967 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
968 {
969         if (remount)
970                 return 0;       /* Ignore now and handle later in
971                                  * ocfs2_remount() */
972         return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
973 }
974
975 static const struct quotactl_ops ocfs2_quotactl_ops = {
976         .quota_on       = ocfs2_quota_on,
977         .quota_off      = ocfs2_quota_off,
978         .quota_sync     = vfs_quota_sync,
979         .get_info       = vfs_get_dqinfo,
980         .set_info       = vfs_set_dqinfo,
981         .get_dqblk      = vfs_get_dqblk,
982         .set_dqblk      = vfs_set_dqblk,
983 };
984
985 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
986 {
987         struct dentry *root;
988         int status, sector_size;
989         struct mount_options parsed_options;
990         struct inode *inode = NULL;
991         struct ocfs2_super *osb = NULL;
992         struct buffer_head *bh = NULL;
993         char nodestr[8];
994         struct ocfs2_blockcheck_stats stats;
995
996         mlog_entry("%p, %p, %i", sb, data, silent);
997
998         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
999                 status = -EINVAL;
1000                 goto read_super_error;
1001         }
1002
1003         /* probe for superblock */
1004         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1005         if (status < 0) {
1006                 mlog(ML_ERROR, "superblock probe failed!\n");
1007                 goto read_super_error;
1008         }
1009
1010         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1011         osb = OCFS2_SB(sb);
1012         if (status < 0) {
1013                 mlog_errno(status);
1014                 goto read_super_error;
1015         }
1016         brelse(bh);
1017         bh = NULL;
1018
1019         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1020                 status = -EINVAL;
1021                 goto read_super_error;
1022         }
1023         osb->s_mount_opt = parsed_options.mount_opt;
1024         osb->s_atime_quantum = parsed_options.atime_quantum;
1025         osb->preferred_slot = parsed_options.slot;
1026         osb->osb_commit_interval = parsed_options.commit_interval;
1027         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1028         osb->local_alloc_bits = osb->local_alloc_default_bits;
1029
1030         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1031         if (status)
1032                 goto read_super_error;
1033
1034         sb->s_magic = OCFS2_SUPER_MAGIC;
1035
1036         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1037                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1038
1039         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1040          * heartbeat=none */
1041         if (bdev_read_only(sb->s_bdev)) {
1042                 if (!(sb->s_flags & MS_RDONLY)) {
1043                         status = -EACCES;
1044                         mlog(ML_ERROR, "Readonly device detected but readonly "
1045                              "mount was not specified.\n");
1046                         goto read_super_error;
1047                 }
1048
1049                 /* You should not be able to start a local heartbeat
1050                  * on a readonly device. */
1051                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1052                         status = -EROFS;
1053                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1054                              "device.\n");
1055                         goto read_super_error;
1056                 }
1057
1058                 status = ocfs2_check_journals_nolocks(osb);
1059                 if (status < 0) {
1060                         if (status == -EROFS)
1061                                 mlog(ML_ERROR, "Recovery required on readonly "
1062                                      "file system, but write access is "
1063                                      "unavailable.\n");
1064                         else
1065                                 mlog_errno(status);
1066                         goto read_super_error;
1067                 }
1068
1069                 ocfs2_set_ro_flag(osb, 1);
1070
1071                 printk(KERN_NOTICE "Readonly device detected. No cluster "
1072                        "services will be utilized for this mount. Recovery "
1073                        "will be skipped.\n");
1074         }
1075
1076         if (!ocfs2_is_hard_readonly(osb)) {
1077                 if (sb->s_flags & MS_RDONLY)
1078                         ocfs2_set_ro_flag(osb, 0);
1079         }
1080
1081         status = ocfs2_verify_heartbeat(osb);
1082         if (status < 0) {
1083                 mlog_errno(status);
1084                 goto read_super_error;
1085         }
1086
1087         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1088                                                  ocfs2_debugfs_root);
1089         if (!osb->osb_debug_root) {
1090                 status = -EINVAL;
1091                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1092                 goto read_super_error;
1093         }
1094
1095         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1096                                             osb->osb_debug_root,
1097                                             osb,
1098                                             &ocfs2_osb_debug_fops);
1099         if (!osb->osb_ctxt) {
1100                 status = -EINVAL;
1101                 mlog_errno(status);
1102                 goto read_super_error;
1103         }
1104
1105         if (ocfs2_meta_ecc(osb)) {
1106                 status = ocfs2_blockcheck_stats_debugfs_install(
1107                                                 &osb->osb_ecc_stats,
1108                                                 osb->osb_debug_root);
1109                 if (status) {
1110                         mlog(ML_ERROR,
1111                              "Unable to create blockcheck statistics "
1112                              "files\n");
1113                         goto read_super_error;
1114                 }
1115         }
1116
1117         status = ocfs2_mount_volume(sb);
1118         if (osb->root_inode)
1119                 inode = igrab(osb->root_inode);
1120
1121         if (status < 0)
1122                 goto read_super_error;
1123
1124         if (!inode) {
1125                 status = -EIO;
1126                 mlog_errno(status);
1127                 goto read_super_error;
1128         }
1129
1130         root = d_alloc_root(inode);
1131         if (!root) {
1132                 status = -ENOMEM;
1133                 mlog_errno(status);
1134                 goto read_super_error;
1135         }
1136
1137         sb->s_root = root;
1138
1139         ocfs2_complete_mount_recovery(osb);
1140
1141         if (ocfs2_mount_local(osb))
1142                 snprintf(nodestr, sizeof(nodestr), "local");
1143         else
1144                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1145
1146         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1147                "with %s data mode.\n",
1148                osb->dev_str, nodestr, osb->slot_num,
1149                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1150                "ordered");
1151
1152         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1153         wake_up(&osb->osb_mount_event);
1154
1155         /* Now we can initialize quotas because we can afford to wait
1156          * for cluster locks recovery now. That also means that truncation
1157          * log recovery can happen but that waits for proper quota setup */
1158         if (!(sb->s_flags & MS_RDONLY)) {
1159                 status = ocfs2_enable_quotas(osb);
1160                 if (status < 0) {
1161                         /* We have to err-out specially here because
1162                          * s_root is already set */
1163                         mlog_errno(status);
1164                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1165                         wake_up(&osb->osb_mount_event);
1166                         mlog_exit(status);
1167                         return status;
1168                 }
1169         }
1170
1171         ocfs2_complete_quota_recovery(osb);
1172
1173         /* Now we wake up again for processes waiting for quotas */
1174         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1175         wake_up(&osb->osb_mount_event);
1176
1177         /* Start this when the mount is almost sure of being successful */
1178         ocfs2_orphan_scan_start(osb);
1179
1180         mlog_exit(status);
1181         return status;
1182
1183 read_super_error:
1184         brelse(bh);
1185
1186         if (inode)
1187                 iput(inode);
1188
1189         if (osb) {
1190                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1191                 wake_up(&osb->osb_mount_event);
1192                 ocfs2_dismount_volume(sb, 1);
1193         }
1194
1195         mlog_exit(status);
1196         return status;
1197 }
1198
1199 static int ocfs2_get_sb(struct file_system_type *fs_type,
1200                         int flags,
1201                         const char *dev_name,
1202                         void *data,
1203                         struct vfsmount *mnt)
1204 {
1205         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1206                            mnt);
1207 }
1208
1209 static void ocfs2_kill_sb(struct super_block *sb)
1210 {
1211         struct ocfs2_super *osb = OCFS2_SB(sb);
1212
1213         /* Failed mount? */
1214         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1215                 goto out;
1216
1217         /* Prevent further queueing of inode drop events */
1218         spin_lock(&dentry_list_lock);
1219         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1220         spin_unlock(&dentry_list_lock);
1221         /* Wait for work to finish and/or remove it */
1222         cancel_work_sync(&osb->dentry_lock_work);
1223 out:
1224         kill_block_super(sb);
1225 }
1226
1227 static struct file_system_type ocfs2_fs_type = {
1228         .owner          = THIS_MODULE,
1229         .name           = "ocfs2",
1230         .get_sb         = ocfs2_get_sb, /* is this called when we mount
1231                                         * the fs? */
1232         .kill_sb        = ocfs2_kill_sb,
1233
1234         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1235         .next           = NULL
1236 };
1237
1238 static int ocfs2_check_set_options(struct super_block *sb,
1239                                    struct mount_options *options)
1240 {
1241         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1242             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1243                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1244                 mlog(ML_ERROR, "User quotas were requested, but this "
1245                      "filesystem does not have the feature enabled.\n");
1246                 return 0;
1247         }
1248         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1249             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1250                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1251                 mlog(ML_ERROR, "Group quotas were requested, but this "
1252                      "filesystem does not have the feature enabled.\n");
1253                 return 0;
1254         }
1255         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1256             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1257                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1258                      "feature is not enabled\n");
1259                 return 0;
1260         }
1261         /* No ACL setting specified? Use XATTR feature... */
1262         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1263                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1264                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1265                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1266                 else
1267                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1268         }
1269         return 1;
1270 }
1271
1272 static int ocfs2_parse_options(struct super_block *sb,
1273                                char *options,
1274                                struct mount_options *mopt,
1275                                int is_remount)
1276 {
1277         int status;
1278         char *p;
1279
1280         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1281                    options ? options : "(none)");
1282
1283         mopt->commit_interval = 0;
1284         mopt->mount_opt = 0;
1285         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1286         mopt->slot = OCFS2_INVALID_SLOT;
1287         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1288         mopt->cluster_stack[0] = '\0';
1289
1290         if (!options) {
1291                 status = 1;
1292                 goto bail;
1293         }
1294
1295         while ((p = strsep(&options, ",")) != NULL) {
1296                 int token, option;
1297                 substring_t args[MAX_OPT_ARGS];
1298
1299                 if (!*p)
1300                         continue;
1301
1302                 token = match_token(p, tokens, args);
1303                 switch (token) {
1304                 case Opt_hb_local:
1305                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1306                         break;
1307                 case Opt_hb_none:
1308                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1309                         break;
1310                 case Opt_barrier:
1311                         if (match_int(&args[0], &option)) {
1312                                 status = 0;
1313                                 goto bail;
1314                         }
1315                         if (option)
1316                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1317                         else
1318                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1319                         break;
1320                 case Opt_intr:
1321                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1322                         break;
1323                 case Opt_nointr:
1324                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1325                         break;
1326                 case Opt_err_panic:
1327                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1328                         break;
1329                 case Opt_err_ro:
1330                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1331                         break;
1332                 case Opt_data_ordered:
1333                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1334                         break;
1335                 case Opt_data_writeback:
1336                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1337                         break;
1338                 case Opt_user_xattr:
1339                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1340                         break;
1341                 case Opt_nouser_xattr:
1342                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1343                         break;
1344                 case Opt_atime_quantum:
1345                         if (match_int(&args[0], &option)) {
1346                                 status = 0;
1347                                 goto bail;
1348                         }
1349                         if (option >= 0)
1350                                 mopt->atime_quantum = option;
1351                         break;
1352                 case Opt_slot:
1353                         option = 0;
1354                         if (match_int(&args[0], &option)) {
1355                                 status = 0;
1356                                 goto bail;
1357                         }
1358                         if (option)
1359                                 mopt->slot = (s16)option;
1360                         break;
1361                 case Opt_commit:
1362                         option = 0;
1363                         if (match_int(&args[0], &option)) {
1364                                 status = 0;
1365                                 goto bail;
1366                         }
1367                         if (option < 0)
1368                                 return 0;
1369                         if (option == 0)
1370                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1371                         mopt->commit_interval = HZ * option;
1372                         break;
1373                 case Opt_localalloc:
1374                         option = 0;
1375                         if (match_int(&args[0], &option)) {
1376                                 status = 0;
1377                                 goto bail;
1378                         }
1379                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1380                                 mopt->localalloc_opt = option;
1381                         break;
1382                 case Opt_localflocks:
1383                         /*
1384                          * Changing this during remount could race
1385                          * flock() requests, or "unbalance" existing
1386                          * ones (e.g., a lock is taken in one mode but
1387                          * dropped in the other). If users care enough
1388                          * to flip locking modes during remount, we
1389                          * could add a "local" flag to individual
1390                          * flock structures for proper tracking of
1391                          * state.
1392                          */
1393                         if (!is_remount)
1394                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1395                         break;
1396                 case Opt_stack:
1397                         /* Check both that the option we were passed
1398                          * is of the right length and that it is a proper
1399                          * string of the right length.
1400                          */
1401                         if (((args[0].to - args[0].from) !=
1402                              OCFS2_STACK_LABEL_LEN) ||
1403                             (strnlen(args[0].from,
1404                                      OCFS2_STACK_LABEL_LEN) !=
1405                              OCFS2_STACK_LABEL_LEN)) {
1406                                 mlog(ML_ERROR,
1407                                      "Invalid cluster_stack option\n");
1408                                 status = 0;
1409                                 goto bail;
1410                         }
1411                         memcpy(mopt->cluster_stack, args[0].from,
1412                                OCFS2_STACK_LABEL_LEN);
1413                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1414                         break;
1415                 case Opt_inode64:
1416                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1417                         break;
1418                 case Opt_usrquota:
1419                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1420                         break;
1421                 case Opt_grpquota:
1422                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1423                         break;
1424                 case Opt_acl:
1425                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1426                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1427                         break;
1428                 case Opt_noacl:
1429                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1430                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1431                         break;
1432                 default:
1433                         mlog(ML_ERROR,
1434                              "Unrecognized mount option \"%s\" "
1435                              "or missing value\n", p);
1436                         status = 0;
1437                         goto bail;
1438                 }
1439         }
1440
1441         status = 1;
1442
1443 bail:
1444         mlog_exit(status);
1445         return status;
1446 }
1447
1448 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1449 {
1450         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1451         unsigned long opts = osb->s_mount_opt;
1452         unsigned int local_alloc_megs;
1453
1454         if (opts & OCFS2_MOUNT_HB_LOCAL)
1455                 seq_printf(s, ",_netdev,heartbeat=local");
1456         else
1457                 seq_printf(s, ",heartbeat=none");
1458
1459         if (opts & OCFS2_MOUNT_NOINTR)
1460                 seq_printf(s, ",nointr");
1461
1462         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1463                 seq_printf(s, ",data=writeback");
1464         else
1465                 seq_printf(s, ",data=ordered");
1466
1467         if (opts & OCFS2_MOUNT_BARRIER)
1468                 seq_printf(s, ",barrier=1");
1469
1470         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1471                 seq_printf(s, ",errors=panic");
1472         else
1473                 seq_printf(s, ",errors=remount-ro");
1474
1475         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1476                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1477
1478         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1479                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1480
1481         if (osb->osb_commit_interval)
1482                 seq_printf(s, ",commit=%u",
1483                            (unsigned) (osb->osb_commit_interval / HZ));
1484
1485         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1486         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1487                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1488
1489         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1490                 seq_printf(s, ",localflocks,");
1491
1492         if (osb->osb_cluster_stack[0])
1493                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1494                            osb->osb_cluster_stack);
1495         if (opts & OCFS2_MOUNT_USRQUOTA)
1496                 seq_printf(s, ",usrquota");
1497         if (opts & OCFS2_MOUNT_GRPQUOTA)
1498                 seq_printf(s, ",grpquota");
1499
1500         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1501                 seq_printf(s, ",nouser_xattr");
1502         else
1503                 seq_printf(s, ",user_xattr");
1504
1505         if (opts & OCFS2_MOUNT_INODE64)
1506                 seq_printf(s, ",inode64");
1507
1508         if (opts & OCFS2_MOUNT_POSIX_ACL)
1509                 seq_printf(s, ",acl");
1510         else
1511                 seq_printf(s, ",noacl");
1512
1513         return 0;
1514 }
1515
1516 static int __init ocfs2_init(void)
1517 {
1518         int status;
1519
1520         mlog_entry_void();
1521
1522         ocfs2_print_version();
1523
1524         status = init_ocfs2_uptodate_cache();
1525         if (status < 0) {
1526                 mlog_errno(status);
1527                 goto leave;
1528         }
1529
1530         status = ocfs2_initialize_mem_caches();
1531         if (status < 0) {
1532                 mlog_errno(status);
1533                 goto leave;
1534         }
1535
1536         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1537         if (!ocfs2_wq) {
1538                 status = -ENOMEM;
1539                 goto leave;
1540         }
1541
1542         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1543         if (!ocfs2_debugfs_root) {
1544                 status = -EFAULT;
1545                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1546         }
1547
1548         status = ocfs2_quota_setup();
1549         if (status)
1550                 goto leave;
1551
1552         ocfs2_set_locking_protocol();
1553
1554         status = register_quota_format(&ocfs2_quota_format);
1555 leave:
1556         if (status < 0) {
1557                 ocfs2_quota_shutdown();
1558                 ocfs2_free_mem_caches();
1559                 exit_ocfs2_uptodate_cache();
1560         }
1561
1562         mlog_exit(status);
1563
1564         if (status >= 0) {
1565                 return register_filesystem(&ocfs2_fs_type);
1566         } else
1567                 return -1;
1568 }
1569
1570 static void __exit ocfs2_exit(void)
1571 {
1572         mlog_entry_void();
1573
1574         ocfs2_quota_shutdown();
1575
1576         if (ocfs2_wq) {
1577                 flush_workqueue(ocfs2_wq);
1578                 destroy_workqueue(ocfs2_wq);
1579         }
1580
1581         unregister_quota_format(&ocfs2_quota_format);
1582
1583         debugfs_remove(ocfs2_debugfs_root);
1584
1585         ocfs2_free_mem_caches();
1586
1587         unregister_filesystem(&ocfs2_fs_type);
1588
1589         exit_ocfs2_uptodate_cache();
1590
1591         mlog_exit_void();
1592 }
1593
1594 static void ocfs2_put_super(struct super_block *sb)
1595 {
1596         mlog_entry("(0x%p)\n", sb);
1597
1598         lock_kernel();
1599
1600         ocfs2_sync_blockdev(sb);
1601         ocfs2_dismount_volume(sb, 0);
1602
1603         unlock_kernel();
1604
1605         mlog_exit_void();
1606 }
1607
1608 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1609 {
1610         struct ocfs2_super *osb;
1611         u32 numbits, freebits;
1612         int status;
1613         struct ocfs2_dinode *bm_lock;
1614         struct buffer_head *bh = NULL;
1615         struct inode *inode = NULL;
1616
1617         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1618
1619         osb = OCFS2_SB(dentry->d_sb);
1620
1621         inode = ocfs2_get_system_file_inode(osb,
1622                                             GLOBAL_BITMAP_SYSTEM_INODE,
1623                                             OCFS2_INVALID_SLOT);
1624         if (!inode) {
1625                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1626                 status = -EIO;
1627                 goto bail;
1628         }
1629
1630         status = ocfs2_inode_lock(inode, &bh, 0);
1631         if (status < 0) {
1632                 mlog_errno(status);
1633                 goto bail;
1634         }
1635
1636         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1637
1638         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1639         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1640
1641         buf->f_type = OCFS2_SUPER_MAGIC;
1642         buf->f_bsize = dentry->d_sb->s_blocksize;
1643         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1644         buf->f_blocks = ((sector_t) numbits) *
1645                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1646         buf->f_bfree = ((sector_t) freebits) *
1647                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1648         buf->f_bavail = buf->f_bfree;
1649         buf->f_files = numbits;
1650         buf->f_ffree = freebits;
1651         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1652                                 & 0xFFFFFFFFUL;
1653         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1654                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1655
1656         brelse(bh);
1657
1658         ocfs2_inode_unlock(inode, 0);
1659         status = 0;
1660 bail:
1661         if (inode)
1662                 iput(inode);
1663
1664         mlog_exit(status);
1665
1666         return status;
1667 }
1668
1669 static void ocfs2_inode_init_once(void *data)
1670 {
1671         struct ocfs2_inode_info *oi = data;
1672
1673         oi->ip_flags = 0;
1674         oi->ip_open_count = 0;
1675         spin_lock_init(&oi->ip_lock);
1676         ocfs2_extent_map_init(&oi->vfs_inode);
1677         INIT_LIST_HEAD(&oi->ip_io_markers);
1678         oi->ip_dir_start_lookup = 0;
1679
1680         init_rwsem(&oi->ip_alloc_sem);
1681         init_rwsem(&oi->ip_xattr_sem);
1682         mutex_init(&oi->ip_io_mutex);
1683
1684         oi->ip_blkno = 0ULL;
1685         oi->ip_clusters = 0;
1686
1687         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1688         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1689         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1690
1691         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1692                                   &ocfs2_inode_caching_ops);
1693
1694         inode_init_once(&oi->vfs_inode);
1695 }
1696
1697 static int ocfs2_initialize_mem_caches(void)
1698 {
1699         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1700                                        sizeof(struct ocfs2_inode_info),
1701                                        0,
1702                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1703                                                 SLAB_MEM_SPREAD),
1704                                        ocfs2_inode_init_once);
1705         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1706                                         sizeof(struct ocfs2_dquot),
1707                                         0,
1708                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1709                                                 SLAB_MEM_SPREAD),
1710                                         NULL);
1711         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1712                                         sizeof(struct ocfs2_quota_chunk),
1713                                         0,
1714                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1715                                         NULL);
1716         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1717             !ocfs2_qf_chunk_cachep) {
1718                 if (ocfs2_inode_cachep)
1719                         kmem_cache_destroy(ocfs2_inode_cachep);
1720                 if (ocfs2_dquot_cachep)
1721                         kmem_cache_destroy(ocfs2_dquot_cachep);
1722                 if (ocfs2_qf_chunk_cachep)
1723                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1724                 return -ENOMEM;
1725         }
1726
1727         return 0;
1728 }
1729
1730 static void ocfs2_free_mem_caches(void)
1731 {
1732         if (ocfs2_inode_cachep)
1733                 kmem_cache_destroy(ocfs2_inode_cachep);
1734         ocfs2_inode_cachep = NULL;
1735
1736         if (ocfs2_dquot_cachep)
1737                 kmem_cache_destroy(ocfs2_dquot_cachep);
1738         ocfs2_dquot_cachep = NULL;
1739
1740         if (ocfs2_qf_chunk_cachep)
1741                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1742         ocfs2_qf_chunk_cachep = NULL;
1743 }
1744
1745 static int ocfs2_get_sector(struct super_block *sb,
1746                             struct buffer_head **bh,
1747                             int block,
1748                             int sect_size)
1749 {
1750         if (!sb_set_blocksize(sb, sect_size)) {
1751                 mlog(ML_ERROR, "unable to set blocksize\n");
1752                 return -EIO;
1753         }
1754
1755         *bh = sb_getblk(sb, block);
1756         if (!*bh) {
1757                 mlog_errno(-EIO);
1758                 return -EIO;
1759         }
1760         lock_buffer(*bh);
1761         if (!buffer_dirty(*bh))
1762                 clear_buffer_uptodate(*bh);
1763         unlock_buffer(*bh);
1764         ll_rw_block(READ, 1, bh);
1765         wait_on_buffer(*bh);
1766         if (!buffer_uptodate(*bh)) {
1767                 mlog_errno(-EIO);
1768                 brelse(*bh);
1769                 *bh = NULL;
1770                 return -EIO;
1771         }
1772
1773         return 0;
1774 }
1775
1776 static int ocfs2_mount_volume(struct super_block *sb)
1777 {
1778         int status = 0;
1779         int unlock_super = 0;
1780         struct ocfs2_super *osb = OCFS2_SB(sb);
1781
1782         mlog_entry_void();
1783
1784         if (ocfs2_is_hard_readonly(osb))
1785                 goto leave;
1786
1787         status = ocfs2_dlm_init(osb);
1788         if (status < 0) {
1789                 mlog_errno(status);
1790                 goto leave;
1791         }
1792
1793         status = ocfs2_super_lock(osb, 1);
1794         if (status < 0) {
1795                 mlog_errno(status);
1796                 goto leave;
1797         }
1798         unlock_super = 1;
1799
1800         /* This will load up the node map and add ourselves to it. */
1801         status = ocfs2_find_slot(osb);
1802         if (status < 0) {
1803                 mlog_errno(status);
1804                 goto leave;
1805         }
1806
1807         /* load all node-local system inodes */
1808         status = ocfs2_init_local_system_inodes(osb);
1809         if (status < 0) {
1810                 mlog_errno(status);
1811                 goto leave;
1812         }
1813
1814         status = ocfs2_check_volume(osb);
1815         if (status < 0) {
1816                 mlog_errno(status);
1817                 goto leave;
1818         }
1819
1820         status = ocfs2_truncate_log_init(osb);
1821         if (status < 0)
1822                 mlog_errno(status);
1823
1824 leave:
1825         if (unlock_super)
1826                 ocfs2_super_unlock(osb, 1);
1827
1828         mlog_exit(status);
1829         return status;
1830 }
1831
1832 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1833 {
1834         int tmp, hangup_needed = 0;
1835         struct ocfs2_super *osb = NULL;
1836         char nodestr[8];
1837
1838         mlog_entry("(0x%p)\n", sb);
1839
1840         BUG_ON(!sb);
1841         osb = OCFS2_SB(sb);
1842         BUG_ON(!osb);
1843
1844         debugfs_remove(osb->osb_ctxt);
1845
1846         /*
1847          * Flush inode dropping work queue so that deletes are
1848          * performed while the filesystem is still working
1849          */
1850         ocfs2_drop_all_dl_inodes(osb);
1851
1852         /* Orphan scan should be stopped as early as possible */
1853         ocfs2_orphan_scan_stop(osb);
1854
1855         ocfs2_disable_quotas(osb);
1856
1857         ocfs2_shutdown_local_alloc(osb);
1858
1859         ocfs2_truncate_log_shutdown(osb);
1860
1861         /* This will disable recovery and flush any recovery work. */
1862         ocfs2_recovery_exit(osb);
1863
1864         ocfs2_journal_shutdown(osb);
1865
1866         ocfs2_sync_blockdev(sb);
1867
1868         ocfs2_purge_refcount_trees(osb);
1869
1870         /* No cluster connection means we've failed during mount, so skip
1871          * all the steps which depended on that to complete. */
1872         if (osb->cconn) {
1873                 tmp = ocfs2_super_lock(osb, 1);
1874                 if (tmp < 0) {
1875                         mlog_errno(tmp);
1876                         return;
1877                 }
1878         }
1879
1880         if (osb->slot_num != OCFS2_INVALID_SLOT)
1881                 ocfs2_put_slot(osb);
1882
1883         if (osb->cconn)
1884                 ocfs2_super_unlock(osb, 1);
1885
1886         ocfs2_release_system_inodes(osb);
1887
1888         /*
1889          * If we're dismounting due to mount error, mount.ocfs2 will clean
1890          * up heartbeat.  If we're a local mount, there is no heartbeat.
1891          * If we failed before we got a uuid_str yet, we can't stop
1892          * heartbeat.  Otherwise, do it.
1893          */
1894         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1895                 hangup_needed = 1;
1896
1897         if (osb->cconn)
1898                 ocfs2_dlm_shutdown(osb, hangup_needed);
1899
1900         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1901         debugfs_remove(osb->osb_debug_root);
1902
1903         if (hangup_needed)
1904                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1905
1906         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1907
1908         if (ocfs2_mount_local(osb))
1909                 snprintf(nodestr, sizeof(nodestr), "local");
1910         else
1911                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1912
1913         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1914                osb->dev_str, nodestr);
1915
1916         ocfs2_delete_osb(osb);
1917         kfree(osb);
1918         sb->s_dev = 0;
1919         sb->s_fs_info = NULL;
1920 }
1921
1922 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1923                                 unsigned uuid_bytes)
1924 {
1925         int i, ret;
1926         char *ptr;
1927
1928         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1929
1930         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1931         if (osb->uuid_str == NULL)
1932                 return -ENOMEM;
1933
1934         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1935                 /* print with null */
1936                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1937                 if (ret != 2) /* drop super cleans up */
1938                         return -EINVAL;
1939                 /* then only advance past the last char */
1940                 ptr += 2;
1941         }
1942
1943         return 0;
1944 }
1945
1946 static int ocfs2_initialize_super(struct super_block *sb,
1947                                   struct buffer_head *bh,
1948                                   int sector_size,
1949                                   struct ocfs2_blockcheck_stats *stats)
1950 {
1951         int status;
1952         int i, cbits, bbits;
1953         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1954         struct inode *inode = NULL;
1955         struct ocfs2_journal *journal;
1956         __le32 uuid_net_key;
1957         struct ocfs2_super *osb;
1958
1959         mlog_entry_void();
1960
1961         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1962         if (!osb) {
1963                 status = -ENOMEM;
1964                 mlog_errno(status);
1965                 goto bail;
1966         }
1967
1968         sb->s_fs_info = osb;
1969         sb->s_op = &ocfs2_sops;
1970         sb->s_export_op = &ocfs2_export_ops;
1971         sb->s_qcop = &ocfs2_quotactl_ops;
1972         sb->dq_op = &ocfs2_quota_operations;
1973         sb->s_xattr = ocfs2_xattr_handlers;
1974         sb->s_time_gran = 1;
1975         sb->s_flags |= MS_NOATIME;
1976         /* this is needed to support O_LARGEFILE */
1977         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1978         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1979         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1980
1981         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1982
1983         for (i = 0; i < 3; i++)
1984                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1985         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1986
1987         osb->sb = sb;
1988         /* Save off for ocfs2_rw_direct */
1989         osb->s_sectsize_bits = blksize_bits(sector_size);
1990         BUG_ON(!osb->s_sectsize_bits);
1991
1992         spin_lock_init(&osb->dc_task_lock);
1993         init_waitqueue_head(&osb->dc_event);
1994         osb->dc_work_sequence = 0;
1995         osb->dc_wake_sequence = 0;
1996         INIT_LIST_HEAD(&osb->blocked_lock_list);
1997         osb->blocked_lock_count = 0;
1998         spin_lock_init(&osb->osb_lock);
1999         spin_lock_init(&osb->osb_xattr_lock);
2000         ocfs2_init_inode_steal_slot(osb);
2001
2002         atomic_set(&osb->alloc_stats.moves, 0);
2003         atomic_set(&osb->alloc_stats.local_data, 0);
2004         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2005         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2006         atomic_set(&osb->alloc_stats.bg_extends, 0);
2007
2008         /* Copy the blockcheck stats from the superblock probe */
2009         osb->osb_ecc_stats = *stats;
2010
2011         ocfs2_init_node_maps(osb);
2012
2013         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2014                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2015
2016         ocfs2_orphan_scan_init(osb);
2017
2018         status = ocfs2_recovery_init(osb);
2019         if (status) {
2020                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2021                 mlog_errno(status);
2022                 goto bail;
2023         }
2024
2025         init_waitqueue_head(&osb->checkpoint_event);
2026         atomic_set(&osb->needs_checkpoint, 0);
2027
2028         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2029
2030         osb->slot_num = OCFS2_INVALID_SLOT;
2031
2032         osb->s_xattr_inline_size = le16_to_cpu(
2033                                         di->id2.i_super.s_xattr_inline_size);
2034
2035         osb->local_alloc_state = OCFS2_LA_UNUSED;
2036         osb->local_alloc_bh = NULL;
2037         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2038
2039         init_waitqueue_head(&osb->osb_mount_event);
2040
2041         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2042         if (!osb->vol_label) {
2043                 mlog(ML_ERROR, "unable to alloc vol label\n");
2044                 status = -ENOMEM;
2045                 goto bail;
2046         }
2047
2048         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2049         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2050                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2051                      osb->max_slots);
2052                 status = -EINVAL;
2053                 goto bail;
2054         }
2055         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2056
2057         osb->slot_recovery_generations =
2058                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2059                         GFP_KERNEL);
2060         if (!osb->slot_recovery_generations) {
2061                 status = -ENOMEM;
2062                 mlog_errno(status);
2063                 goto bail;
2064         }
2065
2066         init_waitqueue_head(&osb->osb_wipe_event);
2067         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2068                                         sizeof(*osb->osb_orphan_wipes),
2069                                         GFP_KERNEL);
2070         if (!osb->osb_orphan_wipes) {
2071                 status = -ENOMEM;
2072                 mlog_errno(status);
2073                 goto bail;
2074         }
2075
2076         osb->osb_rf_lock_tree = RB_ROOT;
2077
2078         osb->s_feature_compat =
2079                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2080         osb->s_feature_ro_compat =
2081                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2082         osb->s_feature_incompat =
2083                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2084
2085         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2086                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2087                      "optional features (%x).\n", i);
2088                 status = -EINVAL;
2089                 goto bail;
2090         }
2091         if (!(osb->sb->s_flags & MS_RDONLY) &&
2092             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2093                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2094                      "unsupported optional features (%x).\n", i);
2095                 status = -EINVAL;
2096                 goto bail;
2097         }
2098
2099         if (ocfs2_userspace_stack(osb)) {
2100                 memcpy(osb->osb_cluster_stack,
2101                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2102                        OCFS2_STACK_LABEL_LEN);
2103                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2104                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2105                         mlog(ML_ERROR,
2106                              "couldn't mount because of an invalid "
2107                              "cluster stack label (%s) \n",
2108                              osb->osb_cluster_stack);
2109                         status = -EINVAL;
2110                         goto bail;
2111                 }
2112         } else {
2113                 /* The empty string is identical with classic tools that
2114                  * don't know about s_cluster_info. */
2115                 osb->osb_cluster_stack[0] = '\0';
2116         }
2117
2118         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2119
2120         /* FIXME
2121          * This should be done in ocfs2_journal_init(), but unknown
2122          * ordering issues will cause the filesystem to crash.
2123          * If anyone wants to figure out what part of the code
2124          * refers to osb->journal before ocfs2_journal_init() is run,
2125          * be my guest.
2126          */
2127         /* initialize our journal structure */
2128
2129         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2130         if (!journal) {
2131                 mlog(ML_ERROR, "unable to alloc journal\n");
2132                 status = -ENOMEM;
2133                 goto bail;
2134         }
2135         osb->journal = journal;
2136         journal->j_osb = osb;
2137
2138         atomic_set(&journal->j_num_trans, 0);
2139         init_rwsem(&journal->j_trans_barrier);
2140         init_waitqueue_head(&journal->j_checkpointed);
2141         spin_lock_init(&journal->j_lock);
2142         journal->j_trans_id = (unsigned long) 1;
2143         INIT_LIST_HEAD(&journal->j_la_cleanups);
2144         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2145         journal->j_state = OCFS2_JOURNAL_FREE;
2146
2147         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2148         osb->dentry_lock_list = NULL;
2149
2150         /* get some pseudo constants for clustersize bits */
2151         osb->s_clustersize_bits =
2152                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2153         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2154         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2155
2156         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2157             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2158                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2159                      osb->s_clustersize);
2160                 status = -EINVAL;
2161                 goto bail;
2162         }
2163
2164         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2165             > (u32)~0UL) {
2166                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2167                      "what jbd can address in 32 bits.\n");
2168                 status = -EINVAL;
2169                 goto bail;
2170         }
2171
2172         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2173                                  sizeof(di->id2.i_super.s_uuid))) {
2174                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2175                 status = -ENOMEM;
2176                 goto bail;
2177         }
2178
2179         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2180
2181         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2182         osb->vol_label[63] = '\0';
2183         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2184         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2185         osb->first_cluster_group_blkno =
2186                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2187         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2188         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2189         mlog(0, "vol_label: %s\n", osb->vol_label);
2190         mlog(0, "uuid: %s\n", osb->uuid_str);
2191         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2192              (unsigned long long)osb->root_blkno,
2193              (unsigned long long)osb->system_dir_blkno);
2194
2195         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2196         if (!osb->osb_dlm_debug) {
2197                 status = -ENOMEM;
2198                 mlog_errno(status);
2199                 goto bail;
2200         }
2201
2202         atomic_set(&osb->vol_state, VOLUME_INIT);
2203
2204         /* load root, system_dir, and all global system inodes */
2205         status = ocfs2_init_global_system_inodes(osb);
2206         if (status < 0) {
2207                 mlog_errno(status);
2208                 goto bail;
2209         }
2210
2211         /*
2212          * global bitmap
2213          */
2214         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2215                                             OCFS2_INVALID_SLOT);
2216         if (!inode) {
2217                 status = -EINVAL;
2218                 mlog_errno(status);
2219                 goto bail;
2220         }
2221
2222         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2223         iput(inode);
2224
2225         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2226
2227         status = ocfs2_init_slot_info(osb);
2228         if (status < 0) {
2229                 mlog_errno(status);
2230                 goto bail;
2231         }
2232
2233 bail:
2234         mlog_exit(status);
2235         return status;
2236 }
2237
2238 /*
2239  * will return: -EAGAIN if it is ok to keep searching for superblocks
2240  *              -EINVAL if there is a bad superblock
2241  *              0 on success
2242  */
2243 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2244                                struct buffer_head *bh,
2245                                u32 blksz,
2246                                struct ocfs2_blockcheck_stats *stats)
2247 {
2248         int status = -EAGAIN;
2249
2250         mlog_entry_void();
2251
2252         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2253                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2254                 /* We have to do a raw check of the feature here */
2255                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2256                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2257                         status = ocfs2_block_check_validate(bh->b_data,
2258                                                             bh->b_size,
2259                                                             &di->i_check,
2260                                                             stats);
2261                         if (status)
2262                                 goto out;
2263                 }
2264                 status = -EINVAL;
2265                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2266                         mlog(ML_ERROR, "found superblock with incorrect block "
2267                              "size: found %u, should be %u\n",
2268                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2269                                blksz);
2270                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2271                            OCFS2_MAJOR_REV_LEVEL ||
2272                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2273                            OCFS2_MINOR_REV_LEVEL) {
2274                         mlog(ML_ERROR, "found superblock with bad version: "
2275                              "found %u.%u, should be %u.%u\n",
2276                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2277                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2278                              OCFS2_MAJOR_REV_LEVEL,
2279                              OCFS2_MINOR_REV_LEVEL);
2280                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2281                         mlog(ML_ERROR, "bad block number on superblock: "
2282                              "found %llu, should be %llu\n",
2283                              (unsigned long long)le64_to_cpu(di->i_blkno),
2284                              (unsigned long long)bh->b_blocknr);
2285                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2286                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2287                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2288                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2289                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2290                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2291                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2292                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2293                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2294                         mlog(ML_ERROR,
2295                              "Superblock slots found greater than file system "
2296                              "maximum: found %u, max %u\n",
2297                              le16_to_cpu(di->id2.i_super.s_max_slots),
2298                              OCFS2_MAX_SLOTS);
2299                 } else {
2300                         /* found it! */
2301                         status = 0;
2302                 }
2303         }
2304
2305 out:
2306         mlog_exit(status);
2307         return status;
2308 }
2309
2310 static int ocfs2_check_volume(struct ocfs2_super *osb)
2311 {
2312         int status;
2313         int dirty;
2314         int local;
2315         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2316                                                   * recover
2317                                                   * ourselves. */
2318
2319         mlog_entry_void();
2320
2321         /* Init our journal object. */
2322         status = ocfs2_journal_init(osb->journal, &dirty);
2323         if (status < 0) {
2324                 mlog(ML_ERROR, "Could not initialize journal!\n");
2325                 goto finally;
2326         }
2327
2328         /* If the journal was unmounted cleanly then we don't want to
2329          * recover anything. Otherwise, journal_load will do that
2330          * dirty work for us :) */
2331         if (!dirty) {
2332                 status = ocfs2_journal_wipe(osb->journal, 0);
2333                 if (status < 0) {
2334                         mlog_errno(status);
2335                         goto finally;
2336                 }
2337         } else {
2338                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2339                      "recovering volume.\n");
2340         }
2341
2342         local = ocfs2_mount_local(osb);
2343
2344         /* will play back anything left in the journal. */
2345         status = ocfs2_journal_load(osb->journal, local, dirty);
2346         if (status < 0) {
2347                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2348                 goto finally;
2349         }
2350
2351         if (dirty) {
2352                 /* recover my local alloc if we didn't unmount cleanly. */
2353                 status = ocfs2_begin_local_alloc_recovery(osb,
2354                                                           osb->slot_num,
2355                                                           &local_alloc);
2356                 if (status < 0) {
2357                         mlog_errno(status);
2358                         goto finally;
2359                 }
2360                 /* we complete the recovery process after we've marked
2361                  * ourselves as mounted. */
2362         }
2363
2364         mlog(0, "Journal loaded.\n");
2365
2366         status = ocfs2_load_local_alloc(osb);
2367         if (status < 0) {
2368                 mlog_errno(status);
2369                 goto finally;
2370         }
2371
2372         if (dirty) {
2373                 /* Recovery will be completed after we've mounted the
2374                  * rest of the volume. */
2375                 osb->dirty = 1;
2376                 osb->local_alloc_copy = local_alloc;
2377                 local_alloc = NULL;
2378         }
2379
2380         /* go through each journal, trylock it and if you get the
2381          * lock, and it's marked as dirty, set the bit in the recover
2382          * map and launch a recovery thread for it. */
2383         status = ocfs2_mark_dead_nodes(osb);
2384         if (status < 0) {
2385                 mlog_errno(status);
2386                 goto finally;
2387         }
2388
2389         status = ocfs2_compute_replay_slots(osb);
2390         if (status < 0)
2391                 mlog_errno(status);
2392
2393 finally:
2394         if (local_alloc)
2395                 kfree(local_alloc);
2396
2397         mlog_exit(status);
2398         return status;
2399 }
2400
2401 /*
2402  * The routine gets called from dismount or close whenever a dismount on
2403  * volume is requested and the osb open count becomes 1.
2404  * It will remove the osb from the global list and also free up all the
2405  * initialized resources and fileobject.
2406  */
2407 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2408 {
2409         mlog_entry_void();
2410
2411         /* This function assumes that the caller has the main osb resource */
2412
2413         ocfs2_free_slot_info(osb);
2414
2415         kfree(osb->osb_orphan_wipes);
2416         kfree(osb->slot_recovery_generations);
2417         /* FIXME
2418          * This belongs in journal shutdown, but because we have to
2419          * allocate osb->journal at the start of ocfs2_initalize_osb(),
2420          * we free it here.
2421          */
2422         kfree(osb->journal);
2423         if (osb->local_alloc_copy)
2424                 kfree(osb->local_alloc_copy);
2425         kfree(osb->uuid_str);
2426         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2427         memset(osb, 0, sizeof(struct ocfs2_super));
2428
2429         mlog_exit_void();
2430 }
2431
2432 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2433  * panic(). We do not support continue-on-error operation. */
2434 static void ocfs2_handle_error(struct super_block *sb)
2435 {
2436         struct ocfs2_super *osb = OCFS2_SB(sb);
2437
2438         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2439                 panic("OCFS2: (device %s): panic forced after error\n",
2440                       sb->s_id);
2441
2442         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2443
2444         if (sb->s_flags & MS_RDONLY &&
2445             (ocfs2_is_soft_readonly(osb) ||
2446              ocfs2_is_hard_readonly(osb)))
2447                 return;
2448
2449         printk(KERN_CRIT "File system is now read-only due to the potential "
2450                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2451                "system is unmounted.\n");
2452         sb->s_flags |= MS_RDONLY;
2453         ocfs2_set_ro_flag(osb, 0);
2454 }
2455
2456 static char error_buf[1024];
2457
2458 void __ocfs2_error(struct super_block *sb,
2459                    const char *function,
2460                    const char *fmt, ...)
2461 {
2462         va_list args;
2463
2464         va_start(args, fmt);
2465         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2466         va_end(args);
2467
2468         /* Not using mlog here because we want to show the actual
2469          * function the error came from. */
2470         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2471                sb->s_id, function, error_buf);
2472
2473         ocfs2_handle_error(sb);
2474 }
2475
2476 /* Handle critical errors. This is intentionally more drastic than
2477  * ocfs2_handle_error, so we only use for things like journal errors,
2478  * etc. */
2479 void __ocfs2_abort(struct super_block* sb,
2480                    const char *function,
2481                    const char *fmt, ...)
2482 {
2483         va_list args;
2484
2485         va_start(args, fmt);
2486         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2487         va_end(args);
2488
2489         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2490                sb->s_id, function, error_buf);
2491
2492         /* We don't have the cluster support yet to go straight to
2493          * hard readonly in here. Until then, we want to keep
2494          * ocfs2_abort() so that we can at least mark critical
2495          * errors.
2496          *
2497          * TODO: This should abort the journal and alert other nodes
2498          * that our slot needs recovery. */
2499
2500         /* Force a panic(). This stinks, but it's better than letting
2501          * things continue without having a proper hard readonly
2502          * here. */
2503         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2504                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2505         ocfs2_handle_error(sb);
2506 }
2507
2508 module_init(ocfs2_init);
2509 module_exit(ocfs2_exit);