xref: /openbmc/linux/fs/ocfs2/super.c (revision fd589a8f)
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * super.c
5  *
6  * load/unload driver, mount/dismount volumes
7  *
8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public
12  * License as published by the Free Software Foundation; either
13  * version 2 of the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public
21  * License along with this program; if not, write to the
22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23  * Boston, MA 021110-1307, USA.
24  */
25 
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/utsname.h>
32 #include <linux/init.h>
33 #include <linux/random.h>
34 #include <linux/statfs.h>
35 #include <linux/moduleparam.h>
36 #include <linux/blkdev.h>
37 #include <linux/socket.h>
38 #include <linux/inet.h>
39 #include <linux/parser.h>
40 #include <linux/crc32.h>
41 #include <linux/debugfs.h>
42 #include <linux/mount.h>
43 #include <linux/seq_file.h>
44 #include <linux/quotaops.h>
45 #include <linux/smp_lock.h>
46 
47 #define MLOG_MASK_PREFIX ML_SUPER
48 #include <cluster/masklog.h>
49 
50 #include "ocfs2.h"
51 
52 /* this should be the only file to include a version 1 header */
53 #include "ocfs1_fs_compat.h"
54 
55 #include "alloc.h"
56 #include "blockcheck.h"
57 #include "dlmglue.h"
58 #include "export.h"
59 #include "extent_map.h"
60 #include "heartbeat.h"
61 #include "inode.h"
62 #include "journal.h"
63 #include "localalloc.h"
64 #include "namei.h"
65 #include "slot_map.h"
66 #include "super.h"
67 #include "sysfile.h"
68 #include "uptodate.h"
69 #include "ver.h"
70 #include "xattr.h"
71 #include "quota.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_show_options(struct seq_file *s, struct vfsmount *mnt);
104 static void ocfs2_put_super(struct super_block *sb);
105 static int ocfs2_mount_volume(struct super_block *sb);
106 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
107 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
108 static int ocfs2_initialize_mem_caches(void);
109 static void ocfs2_free_mem_caches(void);
110 static void ocfs2_delete_osb(struct ocfs2_super *osb);
111 
112 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
113 
114 static int ocfs2_sync_fs(struct super_block *sb, int wait);
115 
116 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
117 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
118 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
119 static int ocfs2_check_volume(struct ocfs2_super *osb);
120 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
121 			       struct buffer_head *bh,
122 			       u32 sectsize,
123 			       struct ocfs2_blockcheck_stats *stats);
124 static int ocfs2_initialize_super(struct super_block *sb,
125 				  struct buffer_head *bh,
126 				  int sector_size,
127 				  struct ocfs2_blockcheck_stats *stats);
128 static int ocfs2_get_sector(struct super_block *sb,
129 			    struct buffer_head **bh,
130 			    int block,
131 			    int sect_size);
132 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
133 static void ocfs2_destroy_inode(struct inode *inode);
134 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
135 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
136 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
137 
138 static const struct super_operations ocfs2_sops = {
139 	.statfs		= ocfs2_statfs,
140 	.alloc_inode	= ocfs2_alloc_inode,
141 	.destroy_inode	= ocfs2_destroy_inode,
142 	.drop_inode	= ocfs2_drop_inode,
143 	.clear_inode	= ocfs2_clear_inode,
144 	.delete_inode	= ocfs2_delete_inode,
145 	.sync_fs	= ocfs2_sync_fs,
146 	.put_super	= ocfs2_put_super,
147 	.remount_fs	= ocfs2_remount,
148 	.show_options   = ocfs2_show_options,
149 	.quota_read	= ocfs2_quota_read,
150 	.quota_write	= ocfs2_quota_write,
151 };
152 
153 enum {
154 	Opt_barrier,
155 	Opt_err_panic,
156 	Opt_err_ro,
157 	Opt_intr,
158 	Opt_nointr,
159 	Opt_hb_none,
160 	Opt_hb_local,
161 	Opt_data_ordered,
162 	Opt_data_writeback,
163 	Opt_atime_quantum,
164 	Opt_slot,
165 	Opt_commit,
166 	Opt_localalloc,
167 	Opt_localflocks,
168 	Opt_stack,
169 	Opt_user_xattr,
170 	Opt_nouser_xattr,
171 	Opt_inode64,
172 	Opt_acl,
173 	Opt_noacl,
174 	Opt_usrquota,
175 	Opt_grpquota,
176 	Opt_err,
177 };
178 
179 static const match_table_t tokens = {
180 	{Opt_barrier, "barrier=%u"},
181 	{Opt_err_panic, "errors=panic"},
182 	{Opt_err_ro, "errors=remount-ro"},
183 	{Opt_intr, "intr"},
184 	{Opt_nointr, "nointr"},
185 	{Opt_hb_none, OCFS2_HB_NONE},
186 	{Opt_hb_local, OCFS2_HB_LOCAL},
187 	{Opt_data_ordered, "data=ordered"},
188 	{Opt_data_writeback, "data=writeback"},
189 	{Opt_atime_quantum, "atime_quantum=%u"},
190 	{Opt_slot, "preferred_slot=%u"},
191 	{Opt_commit, "commit=%u"},
192 	{Opt_localalloc, "localalloc=%d"},
193 	{Opt_localflocks, "localflocks"},
194 	{Opt_stack, "cluster_stack=%s"},
195 	{Opt_user_xattr, "user_xattr"},
196 	{Opt_nouser_xattr, "nouser_xattr"},
197 	{Opt_inode64, "inode64"},
198 	{Opt_acl, "acl"},
199 	{Opt_noacl, "noacl"},
200 	{Opt_usrquota, "usrquota"},
201 	{Opt_grpquota, "grpquota"},
202 	{Opt_err, NULL}
203 };
204 
205 #ifdef CONFIG_DEBUG_FS
206 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
207 {
208 	struct ocfs2_cluster_connection *cconn = osb->cconn;
209 	struct ocfs2_recovery_map *rm = osb->recovery_map;
210 	struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
211 	int i, out = 0;
212 
213 	out += snprintf(buf + out, len - out,
214 			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
215 			"Device", osb->dev_str, osb->uuid_str,
216 			osb->fs_generation, osb->vol_label);
217 
218 	out += snprintf(buf + out, len - out,
219 			"%10s => State: %d  Flags: 0x%lX\n", "Volume",
220 			atomic_read(&osb->vol_state), osb->osb_flags);
221 
222 	out += snprintf(buf + out, len - out,
223 			"%10s => Block: %lu  Cluster: %d\n", "Sizes",
224 			osb->sb->s_blocksize, osb->s_clustersize);
225 
226 	out += snprintf(buf + out, len - out,
227 			"%10s => Compat: 0x%X  Incompat: 0x%X  "
228 			"ROcompat: 0x%X\n",
229 			"Features", osb->s_feature_compat,
230 			osb->s_feature_incompat, osb->s_feature_ro_compat);
231 
232 	out += snprintf(buf + out, len - out,
233 			"%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
234 			osb->s_mount_opt, osb->s_atime_quantum);
235 
236 	if (cconn) {
237 		out += snprintf(buf + out, len - out,
238 				"%10s => Stack: %s  Name: %*s  "
239 				"Version: %d.%d\n", "Cluster",
240 				(*osb->osb_cluster_stack == '\0' ?
241 				 "o2cb" : osb->osb_cluster_stack),
242 				cconn->cc_namelen, cconn->cc_name,
243 				cconn->cc_version.pv_major,
244 				cconn->cc_version.pv_minor);
245 	}
246 
247 	spin_lock(&osb->dc_task_lock);
248 	out += snprintf(buf + out, len - out,
249 			"%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
250 			"WorkSeq: %lu\n", "DownCnvt",
251 			(osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
252 			osb->blocked_lock_count, osb->dc_wake_sequence,
253 			osb->dc_work_sequence);
254 	spin_unlock(&osb->dc_task_lock);
255 
256 	spin_lock(&osb->osb_lock);
257 	out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
258 			"Recovery",
259 			(osb->recovery_thread_task ?
260 			 task_pid_nr(osb->recovery_thread_task) : -1));
261 	if (rm->rm_used == 0)
262 		out += snprintf(buf + out, len - out, " None\n");
263 	else {
264 		for (i = 0; i < rm->rm_used; i++)
265 			out += snprintf(buf + out, len - out, " %d",
266 					rm->rm_entries[i]);
267 		out += snprintf(buf + out, len - out, "\n");
268 	}
269 	spin_unlock(&osb->osb_lock);
270 
271 	out += snprintf(buf + out, len - out,
272 			"%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
273 			(osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
274 			osb->osb_commit_interval,
275 			atomic_read(&osb->needs_checkpoint));
276 
277 	out += snprintf(buf + out, len - out,
278 			"%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
279 			"Journal", osb->journal->j_state,
280 			osb->journal->j_trans_id,
281 			atomic_read(&osb->journal->j_num_trans));
282 
283 	out += snprintf(buf + out, len - out,
284 			"%10s => GlobalAllocs: %d  LocalAllocs: %d  "
285 			"SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
286 			"Stats",
287 			atomic_read(&osb->alloc_stats.bitmap_data),
288 			atomic_read(&osb->alloc_stats.local_data),
289 			atomic_read(&osb->alloc_stats.bg_allocs),
290 			atomic_read(&osb->alloc_stats.moves),
291 			atomic_read(&osb->alloc_stats.bg_extends));
292 
293 	out += snprintf(buf + out, len - out,
294 			"%10s => State: %u  Descriptor: %llu  Size: %u bits  "
295 			"Default: %u bits\n",
296 			"LocalAlloc", osb->local_alloc_state,
297 			(unsigned long long)osb->la_last_gd,
298 			osb->local_alloc_bits, osb->local_alloc_default_bits);
299 
300 	spin_lock(&osb->osb_lock);
301 	out += snprintf(buf + out, len - out,
302 			"%10s => Slot: %d  NumStolen: %d\n", "Steal",
303 			osb->s_inode_steal_slot,
304 			atomic_read(&osb->s_num_inodes_stolen));
305 	spin_unlock(&osb->osb_lock);
306 
307 	out += snprintf(buf + out, len - out, "OrphanScan => ");
308 	out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
309 			os->os_count, os->os_seqno);
310 	out += snprintf(buf + out, len - out, " Last Scan: ");
311 	if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
312 		out += snprintf(buf + out, len - out, "Disabled\n");
313 	else
314 		out += snprintf(buf + out, len - out, "%lu seconds ago\n",
315 				(get_seconds() - os->os_scantime.tv_sec));
316 
317 	out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
318 			"Slots", "Num", "RecoGen");
319 	for (i = 0; i < osb->max_slots; ++i) {
320 		out += snprintf(buf + out, len - out,
321 				"%10s  %c %3d  %10d\n",
322 				" ",
323 				(i == osb->slot_num ? '*' : ' '),
324 				i, osb->slot_recovery_generations[i]);
325 	}
326 
327 	return out;
328 }
329 
330 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
331 {
332 	struct ocfs2_super *osb = inode->i_private;
333 	char *buf = NULL;
334 
335 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
336 	if (!buf)
337 		goto bail;
338 
339 	i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
340 
341 	file->private_data = buf;
342 
343 	return 0;
344 bail:
345 	return -ENOMEM;
346 }
347 
348 static int ocfs2_debug_release(struct inode *inode, struct file *file)
349 {
350 	kfree(file->private_data);
351 	return 0;
352 }
353 
354 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
355 				size_t nbytes, loff_t *ppos)
356 {
357 	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
358 				       i_size_read(file->f_mapping->host));
359 }
360 #else
361 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
362 {
363 	return 0;
364 }
365 static int ocfs2_debug_release(struct inode *inode, struct file *file)
366 {
367 	return 0;
368 }
369 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
370 				size_t nbytes, loff_t *ppos)
371 {
372 	return 0;
373 }
374 #endif	/* CONFIG_DEBUG_FS */
375 
376 static struct file_operations ocfs2_osb_debug_fops = {
377 	.open =		ocfs2_osb_debug_open,
378 	.release =	ocfs2_debug_release,
379 	.read =		ocfs2_debug_read,
380 	.llseek =	generic_file_llseek,
381 };
382 
383 static int ocfs2_sync_fs(struct super_block *sb, int wait)
384 {
385 	int status;
386 	tid_t target;
387 	struct ocfs2_super *osb = OCFS2_SB(sb);
388 
389 	if (ocfs2_is_hard_readonly(osb))
390 		return -EROFS;
391 
392 	if (wait) {
393 		status = ocfs2_flush_truncate_log(osb);
394 		if (status < 0)
395 			mlog_errno(status);
396 	} else {
397 		ocfs2_schedule_truncate_log_flush(osb, 0);
398 	}
399 
400 	if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
401 				      &target)) {
402 		if (wait)
403 			jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
404 					     target);
405 	}
406 	return 0;
407 }
408 
409 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
410 {
411 	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
412 	    && (ino == USER_QUOTA_SYSTEM_INODE
413 		|| ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
414 		return 0;
415 	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
416 	    && (ino == GROUP_QUOTA_SYSTEM_INODE
417 		|| ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
418 		return 0;
419 	return 1;
420 }
421 
422 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
423 {
424 	struct inode *new = NULL;
425 	int status = 0;
426 	int i;
427 
428 	mlog_entry_void();
429 
430 	new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
431 	if (IS_ERR(new)) {
432 		status = PTR_ERR(new);
433 		mlog_errno(status);
434 		goto bail;
435 	}
436 	osb->root_inode = new;
437 
438 	new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
439 	if (IS_ERR(new)) {
440 		status = PTR_ERR(new);
441 		mlog_errno(status);
442 		goto bail;
443 	}
444 	osb->sys_root_inode = new;
445 
446 	for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
447 	     i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
448 		if (!ocfs2_need_system_inode(osb, i))
449 			continue;
450 		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
451 		if (!new) {
452 			ocfs2_release_system_inodes(osb);
453 			status = -EINVAL;
454 			mlog_errno(status);
455 			/* FIXME: Should ERROR_RO_FS */
456 			mlog(ML_ERROR, "Unable to load system inode %d, "
457 			     "possibly corrupt fs?", i);
458 			goto bail;
459 		}
460 		// the array now has one ref, so drop this one
461 		iput(new);
462 	}
463 
464 bail:
465 	mlog_exit(status);
466 	return status;
467 }
468 
469 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
470 {
471 	struct inode *new = NULL;
472 	int status = 0;
473 	int i;
474 
475 	mlog_entry_void();
476 
477 	for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
478 	     i < NUM_SYSTEM_INODES;
479 	     i++) {
480 		if (!ocfs2_need_system_inode(osb, i))
481 			continue;
482 		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
483 		if (!new) {
484 			ocfs2_release_system_inodes(osb);
485 			status = -EINVAL;
486 			mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
487 			     status, i, osb->slot_num);
488 			goto bail;
489 		}
490 		/* the array now has one ref, so drop this one */
491 		iput(new);
492 	}
493 
494 bail:
495 	mlog_exit(status);
496 	return status;
497 }
498 
499 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
500 {
501 	int i;
502 	struct inode *inode;
503 
504 	mlog_entry_void();
505 
506 	for (i = 0; i < NUM_SYSTEM_INODES; i++) {
507 		inode = osb->system_inodes[i];
508 		if (inode) {
509 			iput(inode);
510 			osb->system_inodes[i] = NULL;
511 		}
512 	}
513 
514 	inode = osb->sys_root_inode;
515 	if (inode) {
516 		iput(inode);
517 		osb->sys_root_inode = NULL;
518 	}
519 
520 	inode = osb->root_inode;
521 	if (inode) {
522 		iput(inode);
523 		osb->root_inode = NULL;
524 	}
525 
526 	mlog_exit(0);
527 }
528 
529 /* We're allocating fs objects, use GFP_NOFS */
530 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
531 {
532 	struct ocfs2_inode_info *oi;
533 
534 	oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
535 	if (!oi)
536 		return NULL;
537 
538 	jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
539 	return &oi->vfs_inode;
540 }
541 
542 static void ocfs2_destroy_inode(struct inode *inode)
543 {
544 	kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
545 }
546 
547 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
548 						unsigned int cbits)
549 {
550 	unsigned int bytes = 1 << cbits;
551 	unsigned int trim = bytes;
552 	unsigned int bitshift = 32;
553 
554 	/*
555 	 * i_size and all block offsets in ocfs2 are always 64 bits
556 	 * wide. i_clusters is 32 bits, in cluster-sized units. So on
557 	 * 64 bit platforms, cluster size will be the limiting factor.
558 	 */
559 
560 #if BITS_PER_LONG == 32
561 # if defined(CONFIG_LBDAF)
562 	BUILD_BUG_ON(sizeof(sector_t) != 8);
563 	/*
564 	 * We might be limited by page cache size.
565 	 */
566 	if (bytes > PAGE_CACHE_SIZE) {
567 		bytes = PAGE_CACHE_SIZE;
568 		trim = 1;
569 		/*
570 		 * Shift by 31 here so that we don't get larger than
571 		 * MAX_LFS_FILESIZE
572 		 */
573 		bitshift = 31;
574 	}
575 # else
576 	/*
577 	 * We are limited by the size of sector_t. Use block size, as
578 	 * that's what we expose to the VFS.
579 	 */
580 	bytes = 1 << bbits;
581 	trim = 1;
582 	bitshift = 31;
583 # endif
584 #endif
585 
586 	/*
587 	 * Trim by a whole cluster when we can actually approach the
588 	 * on-disk limits. Otherwise we can overflow i_clusters when
589 	 * an extent start is at the max offset.
590 	 */
591 	return (((unsigned long long)bytes) << bitshift) - trim;
592 }
593 
594 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
595 {
596 	int incompat_features;
597 	int ret = 0;
598 	struct mount_options parsed_options;
599 	struct ocfs2_super *osb = OCFS2_SB(sb);
600 
601 	lock_kernel();
602 
603 	if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
604 		ret = -EINVAL;
605 		goto out;
606 	}
607 
608 	if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
609 	    (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
610 		ret = -EINVAL;
611 		mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
612 		goto out;
613 	}
614 
615 	if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
616 	    (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
617 		ret = -EINVAL;
618 		mlog(ML_ERROR, "Cannot change data mode on remount\n");
619 		goto out;
620 	}
621 
622 	/* Probably don't want this on remount; it might
623 	 * mess with other nodes */
624 	if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
625 	    (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
626 		ret = -EINVAL;
627 		mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
628 		goto out;
629 	}
630 
631 	/* We're going to/from readonly mode. */
632 	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
633 		/* Disable quota accounting before remounting RO */
634 		if (*flags & MS_RDONLY) {
635 			ret = ocfs2_susp_quotas(osb, 0);
636 			if (ret < 0)
637 				goto out;
638 		}
639 		/* Lock here so the check of HARD_RO and the potential
640 		 * setting of SOFT_RO is atomic. */
641 		spin_lock(&osb->osb_lock);
642 		if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
643 			mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
644 			ret = -EROFS;
645 			goto unlock_osb;
646 		}
647 
648 		if (*flags & MS_RDONLY) {
649 			mlog(0, "Going to ro mode.\n");
650 			sb->s_flags |= MS_RDONLY;
651 			osb->osb_flags |= OCFS2_OSB_SOFT_RO;
652 		} else {
653 			mlog(0, "Making ro filesystem writeable.\n");
654 
655 			if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
656 				mlog(ML_ERROR, "Cannot remount RDWR "
657 				     "filesystem due to previous errors.\n");
658 				ret = -EROFS;
659 				goto unlock_osb;
660 			}
661 			incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
662 			if (incompat_features) {
663 				mlog(ML_ERROR, "Cannot remount RDWR because "
664 				     "of unsupported optional features "
665 				     "(%x).\n", incompat_features);
666 				ret = -EINVAL;
667 				goto unlock_osb;
668 			}
669 			sb->s_flags &= ~MS_RDONLY;
670 			osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
671 		}
672 unlock_osb:
673 		spin_unlock(&osb->osb_lock);
674 		/* Enable quota accounting after remounting RW */
675 		if (!ret && !(*flags & MS_RDONLY)) {
676 			if (sb_any_quota_suspended(sb))
677 				ret = ocfs2_susp_quotas(osb, 1);
678 			else
679 				ret = ocfs2_enable_quotas(osb);
680 			if (ret < 0) {
681 				/* Return back changes... */
682 				spin_lock(&osb->osb_lock);
683 				sb->s_flags |= MS_RDONLY;
684 				osb->osb_flags |= OCFS2_OSB_SOFT_RO;
685 				spin_unlock(&osb->osb_lock);
686 				goto out;
687 			}
688 		}
689 	}
690 
691 	if (!ret) {
692 		/* Only save off the new mount options in case of a successful
693 		 * remount. */
694 		if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
695 			parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
696 		osb->s_mount_opt = parsed_options.mount_opt;
697 		osb->s_atime_quantum = parsed_options.atime_quantum;
698 		osb->preferred_slot = parsed_options.slot;
699 		if (parsed_options.commit_interval)
700 			osb->osb_commit_interval = parsed_options.commit_interval;
701 
702 		if (!ocfs2_is_hard_readonly(osb))
703 			ocfs2_set_journal_params(osb);
704 	}
705 out:
706 	unlock_kernel();
707 	return ret;
708 }
709 
710 static int ocfs2_sb_probe(struct super_block *sb,
711 			  struct buffer_head **bh,
712 			  int *sector_size,
713 			  struct ocfs2_blockcheck_stats *stats)
714 {
715 	int status, tmpstat;
716 	struct ocfs1_vol_disk_hdr *hdr;
717 	struct ocfs2_dinode *di;
718 	int blksize;
719 
720 	*bh = NULL;
721 
722 	/* may be > 512 */
723 	*sector_size = bdev_logical_block_size(sb->s_bdev);
724 	if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
725 		mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
726 		     *sector_size, OCFS2_MAX_BLOCKSIZE);
727 		status = -EINVAL;
728 		goto bail;
729 	}
730 
731 	/* Can this really happen? */
732 	if (*sector_size < OCFS2_MIN_BLOCKSIZE)
733 		*sector_size = OCFS2_MIN_BLOCKSIZE;
734 
735 	/* check block zero for old format */
736 	status = ocfs2_get_sector(sb, bh, 0, *sector_size);
737 	if (status < 0) {
738 		mlog_errno(status);
739 		goto bail;
740 	}
741 	hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
742 	if (hdr->major_version == OCFS1_MAJOR_VERSION) {
743 		mlog(ML_ERROR, "incompatible version: %u.%u\n",
744 		     hdr->major_version, hdr->minor_version);
745 		status = -EINVAL;
746 	}
747 	if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
748 		   strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
749 		mlog(ML_ERROR, "incompatible volume signature: %8s\n",
750 		     hdr->signature);
751 		status = -EINVAL;
752 	}
753 	brelse(*bh);
754 	*bh = NULL;
755 	if (status < 0) {
756 		mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
757 		     "upgraded before mounting with ocfs v2\n");
758 		goto bail;
759 	}
760 
761 	/*
762 	 * Now check at magic offset for 512, 1024, 2048, 4096
763 	 * blocksizes.  4096 is the maximum blocksize because it is
764 	 * the minimum clustersize.
765 	 */
766 	status = -EINVAL;
767 	for (blksize = *sector_size;
768 	     blksize <= OCFS2_MAX_BLOCKSIZE;
769 	     blksize <<= 1) {
770 		tmpstat = ocfs2_get_sector(sb, bh,
771 					   OCFS2_SUPER_BLOCK_BLKNO,
772 					   blksize);
773 		if (tmpstat < 0) {
774 			status = tmpstat;
775 			mlog_errno(status);
776 			goto bail;
777 		}
778 		di = (struct ocfs2_dinode *) (*bh)->b_data;
779 		memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
780 		spin_lock_init(&stats->b_lock);
781 		status = ocfs2_verify_volume(di, *bh, blksize, stats);
782 		if (status >= 0)
783 			goto bail;
784 		brelse(*bh);
785 		*bh = NULL;
786 		if (status != -EAGAIN)
787 			break;
788 	}
789 
790 bail:
791 	return status;
792 }
793 
794 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
795 {
796 	if (ocfs2_mount_local(osb)) {
797 		if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
798 			mlog(ML_ERROR, "Cannot heartbeat on a locally "
799 			     "mounted device.\n");
800 			return -EINVAL;
801 		}
802 	}
803 
804 	if (ocfs2_userspace_stack(osb)) {
805 		if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
806 			mlog(ML_ERROR, "Userspace stack expected, but "
807 			     "o2cb heartbeat arguments passed to mount\n");
808 			return -EINVAL;
809 		}
810 	}
811 
812 	if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
813 		if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
814 		    !ocfs2_userspace_stack(osb)) {
815 			mlog(ML_ERROR, "Heartbeat has to be started to mount "
816 			     "a read-write clustered device.\n");
817 			return -EINVAL;
818 		}
819 	}
820 
821 	return 0;
822 }
823 
824 /*
825  * If we're using a userspace stack, mount should have passed
826  * a name that matches the disk.  If not, mount should not
827  * have passed a stack.
828  */
829 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
830 					struct mount_options *mopt)
831 {
832 	if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
833 		mlog(ML_ERROR,
834 		     "cluster stack passed to mount, but this filesystem "
835 		     "does not support it\n");
836 		return -EINVAL;
837 	}
838 
839 	if (ocfs2_userspace_stack(osb) &&
840 	    strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
841 		    OCFS2_STACK_LABEL_LEN)) {
842 		mlog(ML_ERROR,
843 		     "cluster stack passed to mount (\"%s\") does not "
844 		     "match the filesystem (\"%s\")\n",
845 		     mopt->cluster_stack,
846 		     osb->osb_cluster_stack);
847 		return -EINVAL;
848 	}
849 
850 	return 0;
851 }
852 
853 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
854 {
855 	int type;
856 	struct super_block *sb = osb->sb;
857 	unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
858 					     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
859 	int status = 0;
860 
861 	for (type = 0; type < MAXQUOTAS; type++) {
862 		if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
863 			continue;
864 		if (unsuspend)
865 			status = vfs_quota_enable(
866 					sb_dqopt(sb)->files[type],
867 					type, QFMT_OCFS2,
868 					DQUOT_SUSPENDED);
869 		else
870 			status = vfs_quota_disable(sb, type,
871 						   DQUOT_SUSPENDED);
872 		if (status < 0)
873 			break;
874 	}
875 	if (status < 0)
876 		mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
877 		     "remount (error = %d).\n", status);
878 	return status;
879 }
880 
881 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
882 {
883 	struct inode *inode[MAXQUOTAS] = { NULL, NULL };
884 	struct super_block *sb = osb->sb;
885 	unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
886 					     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
887 	unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
888 					LOCAL_GROUP_QUOTA_SYSTEM_INODE };
889 	int status;
890 	int type;
891 
892 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
893 	for (type = 0; type < MAXQUOTAS; type++) {
894 		if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
895 			continue;
896 		inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
897 							osb->slot_num);
898 		if (!inode[type]) {
899 			status = -ENOENT;
900 			goto out_quota_off;
901 		}
902 		status = vfs_quota_enable(inode[type], type, QFMT_OCFS2,
903 						DQUOT_USAGE_ENABLED);
904 		if (status < 0)
905 			goto out_quota_off;
906 	}
907 
908 	for (type = 0; type < MAXQUOTAS; type++)
909 		iput(inode[type]);
910 	return 0;
911 out_quota_off:
912 	ocfs2_disable_quotas(osb);
913 	for (type = 0; type < MAXQUOTAS; type++)
914 		iput(inode[type]);
915 	mlog_errno(status);
916 	return status;
917 }
918 
919 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
920 {
921 	int type;
922 	struct inode *inode;
923 	struct super_block *sb = osb->sb;
924 
925 	/* We mostly ignore errors in this function because there's not much
926 	 * we can do when we see them */
927 	for (type = 0; type < MAXQUOTAS; type++) {
928 		if (!sb_has_quota_loaded(sb, type))
929 			continue;
930 		inode = igrab(sb->s_dquot.files[type]);
931 		/* Turn off quotas. This will remove all dquot structures from
932 		 * memory and so they will be automatically synced to global
933 		 * quota files */
934 		vfs_quota_disable(sb, type, DQUOT_USAGE_ENABLED |
935 					    DQUOT_LIMITS_ENABLED);
936 		if (!inode)
937 			continue;
938 		iput(inode);
939 	}
940 }
941 
942 /* Handle quota on quotactl */
943 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id,
944 			  char *path, int remount)
945 {
946 	unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
947 					     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
948 
949 	if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
950 		return -EINVAL;
951 
952 	if (remount)
953 		return 0;	/* Just ignore it has been handled in
954 				 * ocfs2_remount() */
955 	return vfs_quota_enable(sb_dqopt(sb)->files[type], type,
956 				    format_id, DQUOT_LIMITS_ENABLED);
957 }
958 
959 /* Handle quota off quotactl */
960 static int ocfs2_quota_off(struct super_block *sb, int type, int remount)
961 {
962 	if (remount)
963 		return 0;	/* Ignore now and handle later in
964 				 * ocfs2_remount() */
965 	return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
966 }
967 
968 static struct quotactl_ops ocfs2_quotactl_ops = {
969 	.quota_on	= ocfs2_quota_on,
970 	.quota_off	= ocfs2_quota_off,
971 	.quota_sync	= vfs_quota_sync,
972 	.get_info	= vfs_get_dqinfo,
973 	.set_info	= vfs_set_dqinfo,
974 	.get_dqblk	= vfs_get_dqblk,
975 	.set_dqblk	= vfs_set_dqblk,
976 };
977 
978 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
979 {
980 	struct dentry *root;
981 	int status, sector_size;
982 	struct mount_options parsed_options;
983 	struct inode *inode = NULL;
984 	struct ocfs2_super *osb = NULL;
985 	struct buffer_head *bh = NULL;
986 	char nodestr[8];
987 	struct ocfs2_blockcheck_stats stats;
988 
989 	mlog_entry("%p, %p, %i", sb, data, silent);
990 
991 	if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
992 		status = -EINVAL;
993 		goto read_super_error;
994 	}
995 
996 	/* probe for superblock */
997 	status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
998 	if (status < 0) {
999 		mlog(ML_ERROR, "superblock probe failed!\n");
1000 		goto read_super_error;
1001 	}
1002 
1003 	status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1004 	osb = OCFS2_SB(sb);
1005 	if (status < 0) {
1006 		mlog_errno(status);
1007 		goto read_super_error;
1008 	}
1009 	brelse(bh);
1010 	bh = NULL;
1011 
1012 	if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
1013 		parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1014 
1015 	osb->s_mount_opt = parsed_options.mount_opt;
1016 	osb->s_atime_quantum = parsed_options.atime_quantum;
1017 	osb->preferred_slot = parsed_options.slot;
1018 	osb->osb_commit_interval = parsed_options.commit_interval;
1019 	osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
1020 	osb->local_alloc_bits = osb->local_alloc_default_bits;
1021 	if (osb->s_mount_opt & OCFS2_MOUNT_USRQUOTA &&
1022 	    !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1023 					 OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1024 		status = -EINVAL;
1025 		mlog(ML_ERROR, "User quotas were requested, but this "
1026 		     "filesystem does not have the feature enabled.\n");
1027 		goto read_super_error;
1028 	}
1029 	if (osb->s_mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1030 	    !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1031 					 OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1032 		status = -EINVAL;
1033 		mlog(ML_ERROR, "Group quotas were requested, but this "
1034 		     "filesystem does not have the feature enabled.\n");
1035 		goto read_super_error;
1036 	}
1037 
1038 	status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1039 	if (status)
1040 		goto read_super_error;
1041 
1042 	sb->s_magic = OCFS2_SUPER_MAGIC;
1043 
1044 	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1045 		((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1046 
1047 	/* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1048 	 * heartbeat=none */
1049 	if (bdev_read_only(sb->s_bdev)) {
1050 		if (!(sb->s_flags & MS_RDONLY)) {
1051 			status = -EACCES;
1052 			mlog(ML_ERROR, "Readonly device detected but readonly "
1053 			     "mount was not specified.\n");
1054 			goto read_super_error;
1055 		}
1056 
1057 		/* You should not be able to start a local heartbeat
1058 		 * on a readonly device. */
1059 		if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1060 			status = -EROFS;
1061 			mlog(ML_ERROR, "Local heartbeat specified on readonly "
1062 			     "device.\n");
1063 			goto read_super_error;
1064 		}
1065 
1066 		status = ocfs2_check_journals_nolocks(osb);
1067 		if (status < 0) {
1068 			if (status == -EROFS)
1069 				mlog(ML_ERROR, "Recovery required on readonly "
1070 				     "file system, but write access is "
1071 				     "unavailable.\n");
1072 			else
1073 				mlog_errno(status);
1074 			goto read_super_error;
1075 		}
1076 
1077 		ocfs2_set_ro_flag(osb, 1);
1078 
1079 		printk(KERN_NOTICE "Readonly device detected. No cluster "
1080 		       "services will be utilized for this mount. Recovery "
1081 		       "will be skipped.\n");
1082 	}
1083 
1084 	if (!ocfs2_is_hard_readonly(osb)) {
1085 		if (sb->s_flags & MS_RDONLY)
1086 			ocfs2_set_ro_flag(osb, 0);
1087 	}
1088 
1089 	status = ocfs2_verify_heartbeat(osb);
1090 	if (status < 0) {
1091 		mlog_errno(status);
1092 		goto read_super_error;
1093 	}
1094 
1095 	osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1096 						 ocfs2_debugfs_root);
1097 	if (!osb->osb_debug_root) {
1098 		status = -EINVAL;
1099 		mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1100 		goto read_super_error;
1101 	}
1102 
1103 	osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1104 					    osb->osb_debug_root,
1105 					    osb,
1106 					    &ocfs2_osb_debug_fops);
1107 	if (!osb->osb_ctxt) {
1108 		status = -EINVAL;
1109 		mlog_errno(status);
1110 		goto read_super_error;
1111 	}
1112 
1113 	if (ocfs2_meta_ecc(osb)) {
1114 		status = ocfs2_blockcheck_stats_debugfs_install(
1115 						&osb->osb_ecc_stats,
1116 						osb->osb_debug_root);
1117 		if (status) {
1118 			mlog(ML_ERROR,
1119 			     "Unable to create blockcheck statistics "
1120 			     "files\n");
1121 			goto read_super_error;
1122 		}
1123 	}
1124 
1125 	status = ocfs2_mount_volume(sb);
1126 	if (osb->root_inode)
1127 		inode = igrab(osb->root_inode);
1128 
1129 	if (status < 0)
1130 		goto read_super_error;
1131 
1132 	if (!inode) {
1133 		status = -EIO;
1134 		mlog_errno(status);
1135 		goto read_super_error;
1136 	}
1137 
1138 	root = d_alloc_root(inode);
1139 	if (!root) {
1140 		status = -ENOMEM;
1141 		mlog_errno(status);
1142 		goto read_super_error;
1143 	}
1144 
1145 	sb->s_root = root;
1146 
1147 	ocfs2_complete_mount_recovery(osb);
1148 
1149 	if (ocfs2_mount_local(osb))
1150 		snprintf(nodestr, sizeof(nodestr), "local");
1151 	else
1152 		snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1153 
1154 	printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1155 	       "with %s data mode.\n",
1156 	       osb->dev_str, nodestr, osb->slot_num,
1157 	       osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1158 	       "ordered");
1159 
1160 	atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1161 	wake_up(&osb->osb_mount_event);
1162 
1163 	/* Now we can initialize quotas because we can afford to wait
1164 	 * for cluster locks recovery now. That also means that truncation
1165 	 * log recovery can happen but that waits for proper quota setup */
1166 	if (!(sb->s_flags & MS_RDONLY)) {
1167 		status = ocfs2_enable_quotas(osb);
1168 		if (status < 0) {
1169 			/* We have to err-out specially here because
1170 			 * s_root is already set */
1171 			mlog_errno(status);
1172 			atomic_set(&osb->vol_state, VOLUME_DISABLED);
1173 			wake_up(&osb->osb_mount_event);
1174 			mlog_exit(status);
1175 			return status;
1176 		}
1177 	}
1178 
1179 	ocfs2_complete_quota_recovery(osb);
1180 
1181 	/* Now we wake up again for processes waiting for quotas */
1182 	atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1183 	wake_up(&osb->osb_mount_event);
1184 
1185 	/* Start this when the mount is almost sure of being successful */
1186 	ocfs2_orphan_scan_start(osb);
1187 
1188 	mlog_exit(status);
1189 	return status;
1190 
1191 read_super_error:
1192 	brelse(bh);
1193 
1194 	if (inode)
1195 		iput(inode);
1196 
1197 	if (osb) {
1198 		atomic_set(&osb->vol_state, VOLUME_DISABLED);
1199 		wake_up(&osb->osb_mount_event);
1200 		ocfs2_dismount_volume(sb, 1);
1201 	}
1202 
1203 	mlog_exit(status);
1204 	return status;
1205 }
1206 
1207 static int ocfs2_get_sb(struct file_system_type *fs_type,
1208 			int flags,
1209 			const char *dev_name,
1210 			void *data,
1211 			struct vfsmount *mnt)
1212 {
1213 	return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
1214 			   mnt);
1215 }
1216 
1217 static void ocfs2_kill_sb(struct super_block *sb)
1218 {
1219 	struct ocfs2_super *osb = OCFS2_SB(sb);
1220 
1221 	/* Failed mount? */
1222 	if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1223 		goto out;
1224 
1225 	/* Prevent further queueing of inode drop events */
1226 	spin_lock(&dentry_list_lock);
1227 	ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1228 	spin_unlock(&dentry_list_lock);
1229 	/* Wait for work to finish and/or remove it */
1230 	cancel_work_sync(&osb->dentry_lock_work);
1231 out:
1232 	kill_block_super(sb);
1233 }
1234 
1235 static struct file_system_type ocfs2_fs_type = {
1236 	.owner          = THIS_MODULE,
1237 	.name           = "ocfs2",
1238 	.get_sb         = ocfs2_get_sb, /* is this called when we mount
1239 					* the fs? */
1240 	.kill_sb        = ocfs2_kill_sb,
1241 
1242 	.fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1243 	.next           = NULL
1244 };
1245 
1246 static int ocfs2_parse_options(struct super_block *sb,
1247 			       char *options,
1248 			       struct mount_options *mopt,
1249 			       int is_remount)
1250 {
1251 	int status;
1252 	char *p;
1253 
1254 	mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
1255 		   options ? options : "(none)");
1256 
1257 	mopt->commit_interval = 0;
1258 	mopt->mount_opt = 0;
1259 	mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1260 	mopt->slot = OCFS2_INVALID_SLOT;
1261 	mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
1262 	mopt->cluster_stack[0] = '\0';
1263 
1264 	if (!options) {
1265 		status = 1;
1266 		goto bail;
1267 	}
1268 
1269 	while ((p = strsep(&options, ",")) != NULL) {
1270 		int token, option;
1271 		substring_t args[MAX_OPT_ARGS];
1272 
1273 		if (!*p)
1274 			continue;
1275 
1276 		token = match_token(p, tokens, args);
1277 		switch (token) {
1278 		case Opt_hb_local:
1279 			mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1280 			break;
1281 		case Opt_hb_none:
1282 			mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
1283 			break;
1284 		case Opt_barrier:
1285 			if (match_int(&args[0], &option)) {
1286 				status = 0;
1287 				goto bail;
1288 			}
1289 			if (option)
1290 				mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1291 			else
1292 				mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1293 			break;
1294 		case Opt_intr:
1295 			mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1296 			break;
1297 		case Opt_nointr:
1298 			mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1299 			break;
1300 		case Opt_err_panic:
1301 			mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1302 			break;
1303 		case Opt_err_ro:
1304 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1305 			break;
1306 		case Opt_data_ordered:
1307 			mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1308 			break;
1309 		case Opt_data_writeback:
1310 			mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1311 			break;
1312 		case Opt_user_xattr:
1313 			mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1314 			break;
1315 		case Opt_nouser_xattr:
1316 			mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1317 			break;
1318 		case Opt_atime_quantum:
1319 			if (match_int(&args[0], &option)) {
1320 				status = 0;
1321 				goto bail;
1322 			}
1323 			if (option >= 0)
1324 				mopt->atime_quantum = option;
1325 			break;
1326 		case Opt_slot:
1327 			option = 0;
1328 			if (match_int(&args[0], &option)) {
1329 				status = 0;
1330 				goto bail;
1331 			}
1332 			if (option)
1333 				mopt->slot = (s16)option;
1334 			break;
1335 		case Opt_commit:
1336 			option = 0;
1337 			if (match_int(&args[0], &option)) {
1338 				status = 0;
1339 				goto bail;
1340 			}
1341 			if (option < 0)
1342 				return 0;
1343 			if (option == 0)
1344 				option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1345 			mopt->commit_interval = HZ * option;
1346 			break;
1347 		case Opt_localalloc:
1348 			option = 0;
1349 			if (match_int(&args[0], &option)) {
1350 				status = 0;
1351 				goto bail;
1352 			}
1353 			if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
1354 				mopt->localalloc_opt = option;
1355 			break;
1356 		case Opt_localflocks:
1357 			/*
1358 			 * Changing this during remount could race
1359 			 * flock() requests, or "unbalance" existing
1360 			 * ones (e.g., a lock is taken in one mode but
1361 			 * dropped in the other). If users care enough
1362 			 * to flip locking modes during remount, we
1363 			 * could add a "local" flag to individual
1364 			 * flock structures for proper tracking of
1365 			 * state.
1366 			 */
1367 			if (!is_remount)
1368 				mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1369 			break;
1370 		case Opt_stack:
1371 			/* Check both that the option we were passed
1372 			 * is of the right length and that it is a proper
1373 			 * string of the right length.
1374 			 */
1375 			if (((args[0].to - args[0].from) !=
1376 			     OCFS2_STACK_LABEL_LEN) ||
1377 			    (strnlen(args[0].from,
1378 				     OCFS2_STACK_LABEL_LEN) !=
1379 			     OCFS2_STACK_LABEL_LEN)) {
1380 				mlog(ML_ERROR,
1381 				     "Invalid cluster_stack option\n");
1382 				status = 0;
1383 				goto bail;
1384 			}
1385 			memcpy(mopt->cluster_stack, args[0].from,
1386 			       OCFS2_STACK_LABEL_LEN);
1387 			mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1388 			break;
1389 		case Opt_inode64:
1390 			mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1391 			break;
1392 		case Opt_usrquota:
1393 			/* We check only on remount, otherwise features
1394 			 * aren't yet initialized. */
1395 			if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1396 			    OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1397 				mlog(ML_ERROR, "User quota requested but "
1398 				     "filesystem feature is not set\n");
1399 				status = 0;
1400 				goto bail;
1401 			}
1402 			mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1403 			break;
1404 		case Opt_grpquota:
1405 			if (is_remount && !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1406 			    OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1407 				mlog(ML_ERROR, "Group quota requested but "
1408 				     "filesystem feature is not set\n");
1409 				status = 0;
1410 				goto bail;
1411 			}
1412 			mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1413 			break;
1414 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1415 		case Opt_acl:
1416 			mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1417 			break;
1418 		case Opt_noacl:
1419 			mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1420 			break;
1421 #else
1422 		case Opt_acl:
1423 		case Opt_noacl:
1424 			printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
1425 			break;
1426 #endif
1427 		default:
1428 			mlog(ML_ERROR,
1429 			     "Unrecognized mount option \"%s\" "
1430 			     "or missing value\n", p);
1431 			status = 0;
1432 			goto bail;
1433 		}
1434 	}
1435 
1436 	status = 1;
1437 
1438 bail:
1439 	mlog_exit(status);
1440 	return status;
1441 }
1442 
1443 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1444 {
1445 	struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1446 	unsigned long opts = osb->s_mount_opt;
1447 	unsigned int local_alloc_megs;
1448 
1449 	if (opts & OCFS2_MOUNT_HB_LOCAL)
1450 		seq_printf(s, ",_netdev,heartbeat=local");
1451 	else
1452 		seq_printf(s, ",heartbeat=none");
1453 
1454 	if (opts & OCFS2_MOUNT_NOINTR)
1455 		seq_printf(s, ",nointr");
1456 
1457 	if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1458 		seq_printf(s, ",data=writeback");
1459 	else
1460 		seq_printf(s, ",data=ordered");
1461 
1462 	if (opts & OCFS2_MOUNT_BARRIER)
1463 		seq_printf(s, ",barrier=1");
1464 
1465 	if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1466 		seq_printf(s, ",errors=panic");
1467 	else
1468 		seq_printf(s, ",errors=remount-ro");
1469 
1470 	if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1471 		seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1472 
1473 	if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1474 		seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1475 
1476 	if (osb->osb_commit_interval)
1477 		seq_printf(s, ",commit=%u",
1478 			   (unsigned) (osb->osb_commit_interval / HZ));
1479 
1480 	local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1481 	if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1482 		seq_printf(s, ",localalloc=%d", local_alloc_megs);
1483 
1484 	if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1485 		seq_printf(s, ",localflocks,");
1486 
1487 	if (osb->osb_cluster_stack[0])
1488 		seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1489 			   osb->osb_cluster_stack);
1490 	if (opts & OCFS2_MOUNT_USRQUOTA)
1491 		seq_printf(s, ",usrquota");
1492 	if (opts & OCFS2_MOUNT_GRPQUOTA)
1493 		seq_printf(s, ",grpquota");
1494 
1495 	if (opts & OCFS2_MOUNT_NOUSERXATTR)
1496 		seq_printf(s, ",nouser_xattr");
1497 	else
1498 		seq_printf(s, ",user_xattr");
1499 
1500 	if (opts & OCFS2_MOUNT_INODE64)
1501 		seq_printf(s, ",inode64");
1502 
1503 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1504 	if (opts & OCFS2_MOUNT_POSIX_ACL)
1505 		seq_printf(s, ",acl");
1506 	else
1507 		seq_printf(s, ",noacl");
1508 #endif
1509 
1510 	return 0;
1511 }
1512 
1513 static int __init ocfs2_init(void)
1514 {
1515 	int status;
1516 
1517 	mlog_entry_void();
1518 
1519 	ocfs2_print_version();
1520 
1521 	status = init_ocfs2_uptodate_cache();
1522 	if (status < 0) {
1523 		mlog_errno(status);
1524 		goto leave;
1525 	}
1526 
1527 	status = ocfs2_initialize_mem_caches();
1528 	if (status < 0) {
1529 		mlog_errno(status);
1530 		goto leave;
1531 	}
1532 
1533 	ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1534 	if (!ocfs2_wq) {
1535 		status = -ENOMEM;
1536 		goto leave;
1537 	}
1538 
1539 	ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1540 	if (!ocfs2_debugfs_root) {
1541 		status = -EFAULT;
1542 		mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1543 	}
1544 
1545 	status = ocfs2_quota_setup();
1546 	if (status)
1547 		goto leave;
1548 
1549 	ocfs2_set_locking_protocol();
1550 
1551 	status = register_quota_format(&ocfs2_quota_format);
1552 leave:
1553 	if (status < 0) {
1554 		ocfs2_quota_shutdown();
1555 		ocfs2_free_mem_caches();
1556 		exit_ocfs2_uptodate_cache();
1557 	}
1558 
1559 	mlog_exit(status);
1560 
1561 	if (status >= 0) {
1562 		return register_filesystem(&ocfs2_fs_type);
1563 	} else
1564 		return -1;
1565 }
1566 
1567 static void __exit ocfs2_exit(void)
1568 {
1569 	mlog_entry_void();
1570 
1571 	ocfs2_quota_shutdown();
1572 
1573 	if (ocfs2_wq) {
1574 		flush_workqueue(ocfs2_wq);
1575 		destroy_workqueue(ocfs2_wq);
1576 	}
1577 
1578 	unregister_quota_format(&ocfs2_quota_format);
1579 
1580 	debugfs_remove(ocfs2_debugfs_root);
1581 
1582 	ocfs2_free_mem_caches();
1583 
1584 	unregister_filesystem(&ocfs2_fs_type);
1585 
1586 	exit_ocfs2_uptodate_cache();
1587 
1588 	mlog_exit_void();
1589 }
1590 
1591 static void ocfs2_put_super(struct super_block *sb)
1592 {
1593 	mlog_entry("(0x%p)\n", sb);
1594 
1595 	lock_kernel();
1596 
1597 	ocfs2_sync_blockdev(sb);
1598 	ocfs2_dismount_volume(sb, 0);
1599 
1600 	unlock_kernel();
1601 
1602 	mlog_exit_void();
1603 }
1604 
1605 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1606 {
1607 	struct ocfs2_super *osb;
1608 	u32 numbits, freebits;
1609 	int status;
1610 	struct ocfs2_dinode *bm_lock;
1611 	struct buffer_head *bh = NULL;
1612 	struct inode *inode = NULL;
1613 
1614 	mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1615 
1616 	osb = OCFS2_SB(dentry->d_sb);
1617 
1618 	inode = ocfs2_get_system_file_inode(osb,
1619 					    GLOBAL_BITMAP_SYSTEM_INODE,
1620 					    OCFS2_INVALID_SLOT);
1621 	if (!inode) {
1622 		mlog(ML_ERROR, "failed to get bitmap inode\n");
1623 		status = -EIO;
1624 		goto bail;
1625 	}
1626 
1627 	status = ocfs2_inode_lock(inode, &bh, 0);
1628 	if (status < 0) {
1629 		mlog_errno(status);
1630 		goto bail;
1631 	}
1632 
1633 	bm_lock = (struct ocfs2_dinode *) bh->b_data;
1634 
1635 	numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1636 	freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1637 
1638 	buf->f_type = OCFS2_SUPER_MAGIC;
1639 	buf->f_bsize = dentry->d_sb->s_blocksize;
1640 	buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1641 	buf->f_blocks = ((sector_t) numbits) *
1642 			(osb->s_clustersize >> osb->sb->s_blocksize_bits);
1643 	buf->f_bfree = ((sector_t) freebits) *
1644 		       (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1645 	buf->f_bavail = buf->f_bfree;
1646 	buf->f_files = numbits;
1647 	buf->f_ffree = freebits;
1648 
1649 	brelse(bh);
1650 
1651 	ocfs2_inode_unlock(inode, 0);
1652 	status = 0;
1653 bail:
1654 	if (inode)
1655 		iput(inode);
1656 
1657 	mlog_exit(status);
1658 
1659 	return status;
1660 }
1661 
1662 static void ocfs2_inode_init_once(void *data)
1663 {
1664 	struct ocfs2_inode_info *oi = data;
1665 
1666 	oi->ip_flags = 0;
1667 	oi->ip_open_count = 0;
1668 	spin_lock_init(&oi->ip_lock);
1669 	ocfs2_extent_map_init(&oi->vfs_inode);
1670 	INIT_LIST_HEAD(&oi->ip_io_markers);
1671 	oi->ip_created_trans = 0;
1672 	oi->ip_last_trans = 0;
1673 	oi->ip_dir_start_lookup = 0;
1674 
1675 	init_rwsem(&oi->ip_alloc_sem);
1676 	init_rwsem(&oi->ip_xattr_sem);
1677 	mutex_init(&oi->ip_io_mutex);
1678 
1679 	oi->ip_blkno = 0ULL;
1680 	oi->ip_clusters = 0;
1681 
1682 	ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1683 	ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1684 	ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1685 
1686 	ocfs2_metadata_cache_init(&oi->vfs_inode);
1687 
1688 	inode_init_once(&oi->vfs_inode);
1689 }
1690 
1691 static int ocfs2_initialize_mem_caches(void)
1692 {
1693 	ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1694 				       sizeof(struct ocfs2_inode_info),
1695 				       0,
1696 				       (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1697 						SLAB_MEM_SPREAD),
1698 				       ocfs2_inode_init_once);
1699 	ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1700 					sizeof(struct ocfs2_dquot),
1701 					0,
1702 					(SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1703 						SLAB_MEM_SPREAD),
1704 					NULL);
1705 	ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1706 					sizeof(struct ocfs2_quota_chunk),
1707 					0,
1708 					(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1709 					NULL);
1710 	if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1711 	    !ocfs2_qf_chunk_cachep) {
1712 		if (ocfs2_inode_cachep)
1713 			kmem_cache_destroy(ocfs2_inode_cachep);
1714 		if (ocfs2_dquot_cachep)
1715 			kmem_cache_destroy(ocfs2_dquot_cachep);
1716 		if (ocfs2_qf_chunk_cachep)
1717 			kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1718 		return -ENOMEM;
1719 	}
1720 
1721 	return 0;
1722 }
1723 
1724 static void ocfs2_free_mem_caches(void)
1725 {
1726 	if (ocfs2_inode_cachep)
1727 		kmem_cache_destroy(ocfs2_inode_cachep);
1728 	ocfs2_inode_cachep = NULL;
1729 
1730 	if (ocfs2_dquot_cachep)
1731 		kmem_cache_destroy(ocfs2_dquot_cachep);
1732 	ocfs2_dquot_cachep = NULL;
1733 
1734 	if (ocfs2_qf_chunk_cachep)
1735 		kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1736 	ocfs2_qf_chunk_cachep = NULL;
1737 }
1738 
1739 static int ocfs2_get_sector(struct super_block *sb,
1740 			    struct buffer_head **bh,
1741 			    int block,
1742 			    int sect_size)
1743 {
1744 	if (!sb_set_blocksize(sb, sect_size)) {
1745 		mlog(ML_ERROR, "unable to set blocksize\n");
1746 		return -EIO;
1747 	}
1748 
1749 	*bh = sb_getblk(sb, block);
1750 	if (!*bh) {
1751 		mlog_errno(-EIO);
1752 		return -EIO;
1753 	}
1754 	lock_buffer(*bh);
1755 	if (!buffer_dirty(*bh))
1756 		clear_buffer_uptodate(*bh);
1757 	unlock_buffer(*bh);
1758 	ll_rw_block(READ, 1, bh);
1759 	wait_on_buffer(*bh);
1760 	if (!buffer_uptodate(*bh)) {
1761 		mlog_errno(-EIO);
1762 		brelse(*bh);
1763 		*bh = NULL;
1764 		return -EIO;
1765 	}
1766 
1767 	return 0;
1768 }
1769 
1770 static int ocfs2_mount_volume(struct super_block *sb)
1771 {
1772 	int status = 0;
1773 	int unlock_super = 0;
1774 	struct ocfs2_super *osb = OCFS2_SB(sb);
1775 
1776 	mlog_entry_void();
1777 
1778 	if (ocfs2_is_hard_readonly(osb))
1779 		goto leave;
1780 
1781 	status = ocfs2_dlm_init(osb);
1782 	if (status < 0) {
1783 		mlog_errno(status);
1784 		goto leave;
1785 	}
1786 
1787 	status = ocfs2_super_lock(osb, 1);
1788 	if (status < 0) {
1789 		mlog_errno(status);
1790 		goto leave;
1791 	}
1792 	unlock_super = 1;
1793 
1794 	/* This will load up the node map and add ourselves to it. */
1795 	status = ocfs2_find_slot(osb);
1796 	if (status < 0) {
1797 		mlog_errno(status);
1798 		goto leave;
1799 	}
1800 
1801 	/* load all node-local system inodes */
1802 	status = ocfs2_init_local_system_inodes(osb);
1803 	if (status < 0) {
1804 		mlog_errno(status);
1805 		goto leave;
1806 	}
1807 
1808 	status = ocfs2_check_volume(osb);
1809 	if (status < 0) {
1810 		mlog_errno(status);
1811 		goto leave;
1812 	}
1813 
1814 	status = ocfs2_truncate_log_init(osb);
1815 	if (status < 0)
1816 		mlog_errno(status);
1817 
1818 leave:
1819 	if (unlock_super)
1820 		ocfs2_super_unlock(osb, 1);
1821 
1822 	mlog_exit(status);
1823 	return status;
1824 }
1825 
1826 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1827 {
1828 	int tmp, hangup_needed = 0;
1829 	struct ocfs2_super *osb = NULL;
1830 	char nodestr[8];
1831 
1832 	mlog_entry("(0x%p)\n", sb);
1833 
1834 	BUG_ON(!sb);
1835 	osb = OCFS2_SB(sb);
1836 	BUG_ON(!osb);
1837 
1838 	debugfs_remove(osb->osb_ctxt);
1839 
1840 	/*
1841 	 * Flush inode dropping work queue so that deletes are
1842 	 * performed while the filesystem is still working
1843 	 */
1844 	ocfs2_drop_all_dl_inodes(osb);
1845 
1846 	/* Orphan scan should be stopped as early as possible */
1847 	ocfs2_orphan_scan_stop(osb);
1848 
1849 	ocfs2_disable_quotas(osb);
1850 
1851 	ocfs2_shutdown_local_alloc(osb);
1852 
1853 	ocfs2_truncate_log_shutdown(osb);
1854 
1855 	/* This will disable recovery and flush any recovery work. */
1856 	ocfs2_recovery_exit(osb);
1857 
1858 	ocfs2_journal_shutdown(osb);
1859 
1860 	ocfs2_sync_blockdev(sb);
1861 
1862 	/* No cluster connection means we've failed during mount, so skip
1863 	 * all the steps which depended on that to complete. */
1864 	if (osb->cconn) {
1865 		tmp = ocfs2_super_lock(osb, 1);
1866 		if (tmp < 0) {
1867 			mlog_errno(tmp);
1868 			return;
1869 		}
1870 	}
1871 
1872 	if (osb->slot_num != OCFS2_INVALID_SLOT)
1873 		ocfs2_put_slot(osb);
1874 
1875 	if (osb->cconn)
1876 		ocfs2_super_unlock(osb, 1);
1877 
1878 	ocfs2_release_system_inodes(osb);
1879 
1880 	/*
1881 	 * If we're dismounting due to mount error, mount.ocfs2 will clean
1882 	 * up heartbeat.  If we're a local mount, there is no heartbeat.
1883 	 * If we failed before we got a uuid_str yet, we can't stop
1884 	 * heartbeat.  Otherwise, do it.
1885 	 */
1886 	if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1887 		hangup_needed = 1;
1888 
1889 	if (osb->cconn)
1890 		ocfs2_dlm_shutdown(osb, hangup_needed);
1891 
1892 	ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1893 	debugfs_remove(osb->osb_debug_root);
1894 
1895 	if (hangup_needed)
1896 		ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1897 
1898 	atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1899 
1900 	if (ocfs2_mount_local(osb))
1901 		snprintf(nodestr, sizeof(nodestr), "local");
1902 	else
1903 		snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1904 
1905 	printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1906 	       osb->dev_str, nodestr);
1907 
1908 	ocfs2_delete_osb(osb);
1909 	kfree(osb);
1910 	sb->s_dev = 0;
1911 	sb->s_fs_info = NULL;
1912 }
1913 
1914 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1915 				unsigned uuid_bytes)
1916 {
1917 	int i, ret;
1918 	char *ptr;
1919 
1920 	BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1921 
1922 	osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1923 	if (osb->uuid_str == NULL)
1924 		return -ENOMEM;
1925 
1926 	for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1927 		/* print with null */
1928 		ret = snprintf(ptr, 3, "%02X", uuid[i]);
1929 		if (ret != 2) /* drop super cleans up */
1930 			return -EINVAL;
1931 		/* then only advance past the last char */
1932 		ptr += 2;
1933 	}
1934 
1935 	return 0;
1936 }
1937 
1938 static int ocfs2_initialize_super(struct super_block *sb,
1939 				  struct buffer_head *bh,
1940 				  int sector_size,
1941 				  struct ocfs2_blockcheck_stats *stats)
1942 {
1943 	int status;
1944 	int i, cbits, bbits;
1945 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1946 	struct inode *inode = NULL;
1947 	struct ocfs2_journal *journal;
1948 	__le32 uuid_net_key;
1949 	struct ocfs2_super *osb;
1950 
1951 	mlog_entry_void();
1952 
1953 	osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1954 	if (!osb) {
1955 		status = -ENOMEM;
1956 		mlog_errno(status);
1957 		goto bail;
1958 	}
1959 
1960 	sb->s_fs_info = osb;
1961 	sb->s_op = &ocfs2_sops;
1962 	sb->s_export_op = &ocfs2_export_ops;
1963 	sb->s_qcop = &ocfs2_quotactl_ops;
1964 	sb->dq_op = &ocfs2_quota_operations;
1965 	sb->s_xattr = ocfs2_xattr_handlers;
1966 	sb->s_time_gran = 1;
1967 	sb->s_flags |= MS_NOATIME;
1968 	/* this is needed to support O_LARGEFILE */
1969 	cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1970 	bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1971 	sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1972 
1973 	osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
1974 
1975 	for (i = 0; i < 3; i++)
1976 		osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
1977 	osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1978 
1979 	osb->sb = sb;
1980 	/* Save off for ocfs2_rw_direct */
1981 	osb->s_sectsize_bits = blksize_bits(sector_size);
1982 	BUG_ON(!osb->s_sectsize_bits);
1983 
1984 	spin_lock_init(&osb->dc_task_lock);
1985 	init_waitqueue_head(&osb->dc_event);
1986 	osb->dc_work_sequence = 0;
1987 	osb->dc_wake_sequence = 0;
1988 	INIT_LIST_HEAD(&osb->blocked_lock_list);
1989 	osb->blocked_lock_count = 0;
1990 	spin_lock_init(&osb->osb_lock);
1991 	spin_lock_init(&osb->osb_xattr_lock);
1992 	ocfs2_init_inode_steal_slot(osb);
1993 
1994 	atomic_set(&osb->alloc_stats.moves, 0);
1995 	atomic_set(&osb->alloc_stats.local_data, 0);
1996 	atomic_set(&osb->alloc_stats.bitmap_data, 0);
1997 	atomic_set(&osb->alloc_stats.bg_allocs, 0);
1998 	atomic_set(&osb->alloc_stats.bg_extends, 0);
1999 
2000 	/* Copy the blockcheck stats from the superblock probe */
2001 	osb->osb_ecc_stats = *stats;
2002 
2003 	ocfs2_init_node_maps(osb);
2004 
2005 	snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2006 		 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2007 
2008 	ocfs2_orphan_scan_init(osb);
2009 
2010 	status = ocfs2_recovery_init(osb);
2011 	if (status) {
2012 		mlog(ML_ERROR, "Unable to initialize recovery state\n");
2013 		mlog_errno(status);
2014 		goto bail;
2015 	}
2016 
2017 	init_waitqueue_head(&osb->checkpoint_event);
2018 	atomic_set(&osb->needs_checkpoint, 0);
2019 
2020 	osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2021 
2022 	osb->slot_num = OCFS2_INVALID_SLOT;
2023 
2024 	osb->s_xattr_inline_size = le16_to_cpu(
2025 					di->id2.i_super.s_xattr_inline_size);
2026 
2027 	osb->local_alloc_state = OCFS2_LA_UNUSED;
2028 	osb->local_alloc_bh = NULL;
2029 	INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2030 
2031 	init_waitqueue_head(&osb->osb_mount_event);
2032 
2033 	osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2034 	if (!osb->vol_label) {
2035 		mlog(ML_ERROR, "unable to alloc vol label\n");
2036 		status = -ENOMEM;
2037 		goto bail;
2038 	}
2039 
2040 	osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2041 	if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2042 		mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2043 		     osb->max_slots);
2044 		status = -EINVAL;
2045 		goto bail;
2046 	}
2047 	mlog(0, "max_slots for this device: %u\n", osb->max_slots);
2048 
2049 	osb->slot_recovery_generations =
2050 		kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2051 			GFP_KERNEL);
2052 	if (!osb->slot_recovery_generations) {
2053 		status = -ENOMEM;
2054 		mlog_errno(status);
2055 		goto bail;
2056 	}
2057 
2058 	init_waitqueue_head(&osb->osb_wipe_event);
2059 	osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2060 					sizeof(*osb->osb_orphan_wipes),
2061 					GFP_KERNEL);
2062 	if (!osb->osb_orphan_wipes) {
2063 		status = -ENOMEM;
2064 		mlog_errno(status);
2065 		goto bail;
2066 	}
2067 
2068 	osb->s_feature_compat =
2069 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2070 	osb->s_feature_ro_compat =
2071 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2072 	osb->s_feature_incompat =
2073 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2074 
2075 	if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2076 		mlog(ML_ERROR, "couldn't mount because of unsupported "
2077 		     "optional features (%x).\n", i);
2078 		status = -EINVAL;
2079 		goto bail;
2080 	}
2081 	if (!(osb->sb->s_flags & MS_RDONLY) &&
2082 	    (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2083 		mlog(ML_ERROR, "couldn't mount RDWR because of "
2084 		     "unsupported optional features (%x).\n", i);
2085 		status = -EINVAL;
2086 		goto bail;
2087 	}
2088 
2089 	if (ocfs2_userspace_stack(osb)) {
2090 		memcpy(osb->osb_cluster_stack,
2091 		       OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2092 		       OCFS2_STACK_LABEL_LEN);
2093 		osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2094 		if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2095 			mlog(ML_ERROR,
2096 			     "couldn't mount because of an invalid "
2097 			     "cluster stack label (%s) \n",
2098 			     osb->osb_cluster_stack);
2099 			status = -EINVAL;
2100 			goto bail;
2101 		}
2102 	} else {
2103 		/* The empty string is identical with classic tools that
2104 		 * don't know about s_cluster_info. */
2105 		osb->osb_cluster_stack[0] = '\0';
2106 	}
2107 
2108 	get_random_bytes(&osb->s_next_generation, sizeof(u32));
2109 
2110 	/* FIXME
2111 	 * This should be done in ocfs2_journal_init(), but unknown
2112 	 * ordering issues will cause the filesystem to crash.
2113 	 * If anyone wants to figure out what part of the code
2114 	 * refers to osb->journal before ocfs2_journal_init() is run,
2115 	 * be my guest.
2116 	 */
2117 	/* initialize our journal structure */
2118 
2119 	journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2120 	if (!journal) {
2121 		mlog(ML_ERROR, "unable to alloc journal\n");
2122 		status = -ENOMEM;
2123 		goto bail;
2124 	}
2125 	osb->journal = journal;
2126 	journal->j_osb = osb;
2127 
2128 	atomic_set(&journal->j_num_trans, 0);
2129 	init_rwsem(&journal->j_trans_barrier);
2130 	init_waitqueue_head(&journal->j_checkpointed);
2131 	spin_lock_init(&journal->j_lock);
2132 	journal->j_trans_id = (unsigned long) 1;
2133 	INIT_LIST_HEAD(&journal->j_la_cleanups);
2134 	INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2135 	journal->j_state = OCFS2_JOURNAL_FREE;
2136 
2137 	INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2138 	osb->dentry_lock_list = NULL;
2139 
2140 	/* get some pseudo constants for clustersize bits */
2141 	osb->s_clustersize_bits =
2142 		le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2143 	osb->s_clustersize = 1 << osb->s_clustersize_bits;
2144 	mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
2145 
2146 	if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2147 	    osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2148 		mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2149 		     osb->s_clustersize);
2150 		status = -EINVAL;
2151 		goto bail;
2152 	}
2153 
2154 	if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
2155 	    > (u32)~0UL) {
2156 		mlog(ML_ERROR, "Volume might try to write to blocks beyond "
2157 		     "what jbd can address in 32 bits.\n");
2158 		status = -EINVAL;
2159 		goto bail;
2160 	}
2161 
2162 	if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2163 				 sizeof(di->id2.i_super.s_uuid))) {
2164 		mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2165 		status = -ENOMEM;
2166 		goto bail;
2167 	}
2168 
2169 	memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2170 
2171 	strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2172 	osb->vol_label[63] = '\0';
2173 	osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2174 	osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2175 	osb->first_cluster_group_blkno =
2176 		le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2177 	osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2178 	osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2179 	mlog(0, "vol_label: %s\n", osb->vol_label);
2180 	mlog(0, "uuid: %s\n", osb->uuid_str);
2181 	mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
2182 	     (unsigned long long)osb->root_blkno,
2183 	     (unsigned long long)osb->system_dir_blkno);
2184 
2185 	osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2186 	if (!osb->osb_dlm_debug) {
2187 		status = -ENOMEM;
2188 		mlog_errno(status);
2189 		goto bail;
2190 	}
2191 
2192 	atomic_set(&osb->vol_state, VOLUME_INIT);
2193 
2194 	/* load root, system_dir, and all global system inodes */
2195 	status = ocfs2_init_global_system_inodes(osb);
2196 	if (status < 0) {
2197 		mlog_errno(status);
2198 		goto bail;
2199 	}
2200 
2201 	/*
2202 	 * global bitmap
2203 	 */
2204 	inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2205 					    OCFS2_INVALID_SLOT);
2206 	if (!inode) {
2207 		status = -EINVAL;
2208 		mlog_errno(status);
2209 		goto bail;
2210 	}
2211 
2212 	osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2213 	iput(inode);
2214 
2215 	osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
2216 
2217 	status = ocfs2_init_slot_info(osb);
2218 	if (status < 0) {
2219 		mlog_errno(status);
2220 		goto bail;
2221 	}
2222 
2223 bail:
2224 	mlog_exit(status);
2225 	return status;
2226 }
2227 
2228 /*
2229  * will return: -EAGAIN if it is ok to keep searching for superblocks
2230  *              -EINVAL if there is a bad superblock
2231  *              0 on success
2232  */
2233 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2234 			       struct buffer_head *bh,
2235 			       u32 blksz,
2236 			       struct ocfs2_blockcheck_stats *stats)
2237 {
2238 	int status = -EAGAIN;
2239 
2240 	mlog_entry_void();
2241 
2242 	if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2243 		   strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2244 		/* We have to do a raw check of the feature here */
2245 		if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2246 		    OCFS2_FEATURE_INCOMPAT_META_ECC) {
2247 			status = ocfs2_block_check_validate(bh->b_data,
2248 							    bh->b_size,
2249 							    &di->i_check,
2250 							    stats);
2251 			if (status)
2252 				goto out;
2253 		}
2254 		status = -EINVAL;
2255 		if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2256 			mlog(ML_ERROR, "found superblock with incorrect block "
2257 			     "size: found %u, should be %u\n",
2258 			     1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2259 			       blksz);
2260 		} else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2261 			   OCFS2_MAJOR_REV_LEVEL ||
2262 			   le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2263 			   OCFS2_MINOR_REV_LEVEL) {
2264 			mlog(ML_ERROR, "found superblock with bad version: "
2265 			     "found %u.%u, should be %u.%u\n",
2266 			     le16_to_cpu(di->id2.i_super.s_major_rev_level),
2267 			     le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2268 			     OCFS2_MAJOR_REV_LEVEL,
2269 			     OCFS2_MINOR_REV_LEVEL);
2270 		} else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2271 			mlog(ML_ERROR, "bad block number on superblock: "
2272 			     "found %llu, should be %llu\n",
2273 			     (unsigned long long)le64_to_cpu(di->i_blkno),
2274 			     (unsigned long long)bh->b_blocknr);
2275 		} else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2276 			    le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2277 			mlog(ML_ERROR, "bad cluster size found: %u\n",
2278 			     1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2279 		} else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2280 			mlog(ML_ERROR, "bad root_blkno: 0\n");
2281 		} else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2282 			mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2283 		} else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2284 			mlog(ML_ERROR,
2285 			     "Superblock slots found greater than file system "
2286 			     "maximum: found %u, max %u\n",
2287 			     le16_to_cpu(di->id2.i_super.s_max_slots),
2288 			     OCFS2_MAX_SLOTS);
2289 		} else {
2290 			/* found it! */
2291 			status = 0;
2292 		}
2293 	}
2294 
2295 out:
2296 	mlog_exit(status);
2297 	return status;
2298 }
2299 
2300 static int ocfs2_check_volume(struct ocfs2_super *osb)
2301 {
2302 	int status;
2303 	int dirty;
2304 	int local;
2305 	struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2306 						  * recover
2307 						  * ourselves. */
2308 
2309 	mlog_entry_void();
2310 
2311 	/* Init our journal object. */
2312 	status = ocfs2_journal_init(osb->journal, &dirty);
2313 	if (status < 0) {
2314 		mlog(ML_ERROR, "Could not initialize journal!\n");
2315 		goto finally;
2316 	}
2317 
2318 	/* If the journal was unmounted cleanly then we don't want to
2319 	 * recover anything. Otherwise, journal_load will do that
2320 	 * dirty work for us :) */
2321 	if (!dirty) {
2322 		status = ocfs2_journal_wipe(osb->journal, 0);
2323 		if (status < 0) {
2324 			mlog_errno(status);
2325 			goto finally;
2326 		}
2327 	} else {
2328 		mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2329 		     "recovering volume.\n");
2330 	}
2331 
2332 	local = ocfs2_mount_local(osb);
2333 
2334 	/* will play back anything left in the journal. */
2335 	status = ocfs2_journal_load(osb->journal, local, dirty);
2336 	if (status < 0) {
2337 		mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2338 		goto finally;
2339 	}
2340 
2341 	if (dirty) {
2342 		/* recover my local alloc if we didn't unmount cleanly. */
2343 		status = ocfs2_begin_local_alloc_recovery(osb,
2344 							  osb->slot_num,
2345 							  &local_alloc);
2346 		if (status < 0) {
2347 			mlog_errno(status);
2348 			goto finally;
2349 		}
2350 		/* we complete the recovery process after we've marked
2351 		 * ourselves as mounted. */
2352 	}
2353 
2354 	mlog(0, "Journal loaded.\n");
2355 
2356 	status = ocfs2_load_local_alloc(osb);
2357 	if (status < 0) {
2358 		mlog_errno(status);
2359 		goto finally;
2360 	}
2361 
2362 	if (dirty) {
2363 		/* Recovery will be completed after we've mounted the
2364 		 * rest of the volume. */
2365 		osb->dirty = 1;
2366 		osb->local_alloc_copy = local_alloc;
2367 		local_alloc = NULL;
2368 	}
2369 
2370 	/* go through each journal, trylock it and if you get the
2371 	 * lock, and it's marked as dirty, set the bit in the recover
2372 	 * map and launch a recovery thread for it. */
2373 	status = ocfs2_mark_dead_nodes(osb);
2374 	if (status < 0) {
2375 		mlog_errno(status);
2376 		goto finally;
2377 	}
2378 
2379 	status = ocfs2_compute_replay_slots(osb);
2380 	if (status < 0)
2381 		mlog_errno(status);
2382 
2383 finally:
2384 	if (local_alloc)
2385 		kfree(local_alloc);
2386 
2387 	mlog_exit(status);
2388 	return status;
2389 }
2390 
2391 /*
2392  * The routine gets called from dismount or close whenever a dismount on
2393  * volume is requested and the osb open count becomes 1.
2394  * It will remove the osb from the global list and also free up all the
2395  * initialized resources and fileobject.
2396  */
2397 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2398 {
2399 	mlog_entry_void();
2400 
2401 	/* This function assumes that the caller has the main osb resource */
2402 
2403 	ocfs2_free_slot_info(osb);
2404 
2405 	kfree(osb->osb_orphan_wipes);
2406 	kfree(osb->slot_recovery_generations);
2407 	/* FIXME
2408 	 * This belongs in journal shutdown, but because we have to
2409 	 * allocate osb->journal at the start of ocfs2_initalize_osb(),
2410 	 * we free it here.
2411 	 */
2412 	kfree(osb->journal);
2413 	if (osb->local_alloc_copy)
2414 		kfree(osb->local_alloc_copy);
2415 	kfree(osb->uuid_str);
2416 	ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2417 	memset(osb, 0, sizeof(struct ocfs2_super));
2418 
2419 	mlog_exit_void();
2420 }
2421 
2422 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2423  * panic(). We do not support continue-on-error operation. */
2424 static void ocfs2_handle_error(struct super_block *sb)
2425 {
2426 	struct ocfs2_super *osb = OCFS2_SB(sb);
2427 
2428 	if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2429 		panic("OCFS2: (device %s): panic forced after error\n",
2430 		      sb->s_id);
2431 
2432 	ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2433 
2434 	if (sb->s_flags & MS_RDONLY &&
2435 	    (ocfs2_is_soft_readonly(osb) ||
2436 	     ocfs2_is_hard_readonly(osb)))
2437 		return;
2438 
2439 	printk(KERN_CRIT "File system is now read-only due to the potential "
2440 	       "of on-disk corruption. Please run fsck.ocfs2 once the file "
2441 	       "system is unmounted.\n");
2442 	sb->s_flags |= MS_RDONLY;
2443 	ocfs2_set_ro_flag(osb, 0);
2444 }
2445 
2446 static char error_buf[1024];
2447 
2448 void __ocfs2_error(struct super_block *sb,
2449 		   const char *function,
2450 		   const char *fmt, ...)
2451 {
2452 	va_list args;
2453 
2454 	va_start(args, fmt);
2455 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2456 	va_end(args);
2457 
2458 	/* Not using mlog here because we want to show the actual
2459 	 * function the error came from. */
2460 	printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2461 	       sb->s_id, function, error_buf);
2462 
2463 	ocfs2_handle_error(sb);
2464 }
2465 
2466 /* Handle critical errors. This is intentionally more drastic than
2467  * ocfs2_handle_error, so we only use for things like journal errors,
2468  * etc. */
2469 void __ocfs2_abort(struct super_block* sb,
2470 		   const char *function,
2471 		   const char *fmt, ...)
2472 {
2473 	va_list args;
2474 
2475 	va_start(args, fmt);
2476 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2477 	va_end(args);
2478 
2479 	printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2480 	       sb->s_id, function, error_buf);
2481 
2482 	/* We don't have the cluster support yet to go straight to
2483 	 * hard readonly in here. Until then, we want to keep
2484 	 * ocfs2_abort() so that we can at least mark critical
2485 	 * errors.
2486 	 *
2487 	 * TODO: This should abort the journal and alert other nodes
2488 	 * that our slot needs recovery. */
2489 
2490 	/* Force a panic(). This stinks, but it's better than letting
2491 	 * things continue without having a proper hard readonly
2492 	 * here. */
2493 	OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2494 	ocfs2_handle_error(sb);
2495 }
2496 
2497 module_init(ocfs2_init);
2498 module_exit(ocfs2_exit);
2499