1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * super.c
4  *
5  * load/unload driver, mount/dismount volumes
6  *
7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
8  */
9 
10 #include <linux/module.h>
11 #include <linux/fs.h>
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/highmem.h>
15 #include <linux/init.h>
16 #include <linux/random.h>
17 #include <linux/statfs.h>
18 #include <linux/moduleparam.h>
19 #include <linux/blkdev.h>
20 #include <linux/socket.h>
21 #include <linux/inet.h>
22 #include <linux/parser.h>
23 #include <linux/crc32.h>
24 #include <linux/debugfs.h>
25 #include <linux/mount.h>
26 #include <linux/seq_file.h>
27 #include <linux/quotaops.h>
28 #include <linux/signal.h>
29 
30 #define CREATE_TRACE_POINTS
31 #include "ocfs2_trace.h"
32 
33 #include <cluster/masklog.h>
34 
35 #include "ocfs2.h"
36 
37 /* this should be the only file to include a version 1 header */
38 #include "ocfs1_fs_compat.h"
39 
40 #include "alloc.h"
41 #include "aops.h"
42 #include "blockcheck.h"
43 #include "dlmglue.h"
44 #include "export.h"
45 #include "extent_map.h"
46 #include "heartbeat.h"
47 #include "inode.h"
48 #include "journal.h"
49 #include "localalloc.h"
50 #include "namei.h"
51 #include "slot_map.h"
52 #include "super.h"
53 #include "sysfile.h"
54 #include "uptodate.h"
55 #include "xattr.h"
56 #include "quota.h"
57 #include "refcounttree.h"
58 #include "suballoc.h"
59 
60 #include "buffer_head_io.h"
61 #include "filecheck.h"
62 
63 static struct kmem_cache *ocfs2_inode_cachep;
64 struct kmem_cache *ocfs2_dquot_cachep;
65 struct kmem_cache *ocfs2_qf_chunk_cachep;
66 
67 static struct dentry *ocfs2_debugfs_root;
68 
69 MODULE_AUTHOR("Oracle");
70 MODULE_LICENSE("GPL");
71 MODULE_DESCRIPTION("OCFS2 cluster file system");
72 
73 struct mount_options
74 {
75 	unsigned long	commit_interval;
76 	unsigned long	mount_opt;
77 	unsigned int	atime_quantum;
78 	unsigned short	slot;
79 	int		localalloc_opt;
80 	unsigned int	resv_level;
81 	int		dir_resv_level;
82 	char		cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
83 };
84 
85 static int ocfs2_parse_options(struct super_block *sb, char *options,
86 			       struct mount_options *mopt,
87 			       int is_remount);
88 static int ocfs2_check_set_options(struct super_block *sb,
89 				   struct mount_options *options);
90 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
91 static void ocfs2_put_super(struct super_block *sb);
92 static int ocfs2_mount_volume(struct super_block *sb);
93 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
94 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
95 static int ocfs2_initialize_mem_caches(void);
96 static void ocfs2_free_mem_caches(void);
97 static void ocfs2_delete_osb(struct ocfs2_super *osb);
98 
99 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
100 
101 static int ocfs2_sync_fs(struct super_block *sb, int wait);
102 
103 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
104 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
105 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
106 static int ocfs2_check_volume(struct ocfs2_super *osb);
107 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
108 			       struct buffer_head *bh,
109 			       u32 sectsize,
110 			       struct ocfs2_blockcheck_stats *stats);
111 static int ocfs2_initialize_super(struct super_block *sb,
112 				  struct buffer_head *bh,
113 				  int sector_size,
114 				  struct ocfs2_blockcheck_stats *stats);
115 static int ocfs2_get_sector(struct super_block *sb,
116 			    struct buffer_head **bh,
117 			    int block,
118 			    int sect_size);
119 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
120 static void ocfs2_free_inode(struct inode *inode);
121 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
122 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
123 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
124 
ocfs2_get_dquots(struct inode * inode)125 static struct dquot **ocfs2_get_dquots(struct inode *inode)
126 {
127 	return OCFS2_I(inode)->i_dquot;
128 }
129 
130 static const struct super_operations ocfs2_sops = {
131 	.statfs		= ocfs2_statfs,
132 	.alloc_inode	= ocfs2_alloc_inode,
133 	.free_inode	= ocfs2_free_inode,
134 	.drop_inode	= ocfs2_drop_inode,
135 	.evict_inode	= ocfs2_evict_inode,
136 	.sync_fs	= ocfs2_sync_fs,
137 	.put_super	= ocfs2_put_super,
138 	.remount_fs	= ocfs2_remount,
139 	.show_options   = ocfs2_show_options,
140 	.quota_read	= ocfs2_quota_read,
141 	.quota_write	= ocfs2_quota_write,
142 	.get_dquots	= ocfs2_get_dquots,
143 };
144 
145 enum {
146 	Opt_barrier,
147 	Opt_err_panic,
148 	Opt_err_ro,
149 	Opt_intr,
150 	Opt_nointr,
151 	Opt_hb_none,
152 	Opt_hb_local,
153 	Opt_hb_global,
154 	Opt_data_ordered,
155 	Opt_data_writeback,
156 	Opt_atime_quantum,
157 	Opt_slot,
158 	Opt_commit,
159 	Opt_localalloc,
160 	Opt_localflocks,
161 	Opt_stack,
162 	Opt_user_xattr,
163 	Opt_nouser_xattr,
164 	Opt_inode64,
165 	Opt_acl,
166 	Opt_noacl,
167 	Opt_usrquota,
168 	Opt_grpquota,
169 	Opt_coherency_buffered,
170 	Opt_coherency_full,
171 	Opt_resv_level,
172 	Opt_dir_resv_level,
173 	Opt_journal_async_commit,
174 	Opt_err_cont,
175 	Opt_err,
176 };
177 
178 static const match_table_t tokens = {
179 	{Opt_barrier, "barrier=%u"},
180 	{Opt_err_panic, "errors=panic"},
181 	{Opt_err_ro, "errors=remount-ro"},
182 	{Opt_intr, "intr"},
183 	{Opt_nointr, "nointr"},
184 	{Opt_hb_none, OCFS2_HB_NONE},
185 	{Opt_hb_local, OCFS2_HB_LOCAL},
186 	{Opt_hb_global, OCFS2_HB_GLOBAL},
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_coherency_buffered, "coherency=buffered"},
203 	{Opt_coherency_full, "coherency=full"},
204 	{Opt_resv_level, "resv_level=%u"},
205 	{Opt_dir_resv_level, "dir_resv_level=%u"},
206 	{Opt_journal_async_commit, "journal_async_commit"},
207 	{Opt_err_cont, "errors=continue"},
208 	{Opt_err, NULL}
209 };
210 
211 #ifdef CONFIG_DEBUG_FS
ocfs2_osb_dump(struct ocfs2_super * osb,char * buf,int len)212 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
213 {
214 	struct ocfs2_cluster_connection *cconn = osb->cconn;
215 	struct ocfs2_recovery_map *rm = osb->recovery_map;
216 	struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
217 	int i, out = 0;
218 	unsigned long flags;
219 
220 	out += scnprintf(buf + out, len - out,
221 			"%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
222 			"Device", osb->dev_str, osb->uuid_str,
223 			osb->fs_generation, osb->vol_label);
224 
225 	out += scnprintf(buf + out, len - out,
226 			"%10s => State: %d  Flags: 0x%lX\n", "Volume",
227 			atomic_read(&osb->vol_state), osb->osb_flags);
228 
229 	out += scnprintf(buf + out, len - out,
230 			"%10s => Block: %lu  Cluster: %d\n", "Sizes",
231 			osb->sb->s_blocksize, osb->s_clustersize);
232 
233 	out += scnprintf(buf + out, len - out,
234 			"%10s => Compat: 0x%X  Incompat: 0x%X  "
235 			"ROcompat: 0x%X\n",
236 			"Features", osb->s_feature_compat,
237 			osb->s_feature_incompat, osb->s_feature_ro_compat);
238 
239 	out += scnprintf(buf + out, len - out,
240 			"%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
241 			osb->s_mount_opt, osb->s_atime_quantum);
242 
243 	if (cconn) {
244 		out += scnprintf(buf + out, len - out,
245 				"%10s => Stack: %s  Name: %*s  "
246 				"Version: %d.%d\n", "Cluster",
247 				(*osb->osb_cluster_stack == '\0' ?
248 				 "o2cb" : osb->osb_cluster_stack),
249 				cconn->cc_namelen, cconn->cc_name,
250 				cconn->cc_version.pv_major,
251 				cconn->cc_version.pv_minor);
252 	}
253 
254 	spin_lock_irqsave(&osb->dc_task_lock, flags);
255 	out += scnprintf(buf + out, len - out,
256 			"%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
257 			"WorkSeq: %lu\n", "DownCnvt",
258 			(osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
259 			osb->blocked_lock_count, osb->dc_wake_sequence,
260 			osb->dc_work_sequence);
261 	spin_unlock_irqrestore(&osb->dc_task_lock, flags);
262 
263 	spin_lock(&osb->osb_lock);
264 	out += scnprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
265 			"Recovery",
266 			(osb->recovery_thread_task ?
267 			 task_pid_nr(osb->recovery_thread_task) : -1));
268 	if (rm->rm_used == 0)
269 		out += scnprintf(buf + out, len - out, " None\n");
270 	else {
271 		for (i = 0; i < rm->rm_used; i++)
272 			out += scnprintf(buf + out, len - out, " %d",
273 					rm->rm_entries[i]);
274 		out += scnprintf(buf + out, len - out, "\n");
275 	}
276 	spin_unlock(&osb->osb_lock);
277 
278 	out += scnprintf(buf + out, len - out,
279 			"%10s => Pid: %d  Interval: %lu\n", "Commit",
280 			(osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
281 			osb->osb_commit_interval);
282 
283 	out += scnprintf(buf + out, len - out,
284 			"%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
285 			"Journal", osb->journal->j_state,
286 			osb->journal->j_trans_id,
287 			atomic_read(&osb->journal->j_num_trans));
288 
289 	out += scnprintf(buf + out, len - out,
290 			"%10s => GlobalAllocs: %d  LocalAllocs: %d  "
291 			"SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
292 			"Stats",
293 			atomic_read(&osb->alloc_stats.bitmap_data),
294 			atomic_read(&osb->alloc_stats.local_data),
295 			atomic_read(&osb->alloc_stats.bg_allocs),
296 			atomic_read(&osb->alloc_stats.moves),
297 			atomic_read(&osb->alloc_stats.bg_extends));
298 
299 	out += scnprintf(buf + out, len - out,
300 			"%10s => State: %u  Descriptor: %llu  Size: %u bits  "
301 			"Default: %u bits\n",
302 			"LocalAlloc", osb->local_alloc_state,
303 			(unsigned long long)osb->la_last_gd,
304 			osb->local_alloc_bits, osb->local_alloc_default_bits);
305 
306 	spin_lock(&osb->osb_lock);
307 	out += scnprintf(buf + out, len - out,
308 			"%10s => InodeSlot: %d  StolenInodes: %d, "
309 			"MetaSlot: %d  StolenMeta: %d\n", "Steal",
310 			osb->s_inode_steal_slot,
311 			atomic_read(&osb->s_num_inodes_stolen),
312 			osb->s_meta_steal_slot,
313 			atomic_read(&osb->s_num_meta_stolen));
314 	spin_unlock(&osb->osb_lock);
315 
316 	out += scnprintf(buf + out, len - out, "OrphanScan => ");
317 	out += scnprintf(buf + out, len - out, "Local: %u  Global: %u ",
318 			os->os_count, os->os_seqno);
319 	out += scnprintf(buf + out, len - out, " Last Scan: ");
320 	if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
321 		out += scnprintf(buf + out, len - out, "Disabled\n");
322 	else
323 		out += scnprintf(buf + out, len - out, "%lu seconds ago\n",
324 				(unsigned long)(ktime_get_seconds() - os->os_scantime));
325 
326 	out += scnprintf(buf + out, len - out, "%10s => %3s  %10s\n",
327 			"Slots", "Num", "RecoGen");
328 	for (i = 0; i < osb->max_slots; ++i) {
329 		out += scnprintf(buf + out, len - out,
330 				"%10s  %c %3d  %10d\n",
331 				" ",
332 				(i == osb->slot_num ? '*' : ' '),
333 				i, osb->slot_recovery_generations[i]);
334 	}
335 
336 	return out;
337 }
338 
ocfs2_osb_debug_open(struct inode * inode,struct file * file)339 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
340 {
341 	struct ocfs2_super *osb = inode->i_private;
342 	char *buf = NULL;
343 
344 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
345 	if (!buf)
346 		goto bail;
347 
348 	i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
349 
350 	file->private_data = buf;
351 
352 	return 0;
353 bail:
354 	return -ENOMEM;
355 }
356 
ocfs2_debug_release(struct inode * inode,struct file * file)357 static int ocfs2_debug_release(struct inode *inode, struct file *file)
358 {
359 	kfree(file->private_data);
360 	return 0;
361 }
362 
ocfs2_debug_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)363 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
364 				size_t nbytes, loff_t *ppos)
365 {
366 	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
367 				       i_size_read(file->f_mapping->host));
368 }
369 #else
ocfs2_osb_debug_open(struct inode * inode,struct file * file)370 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
371 {
372 	return 0;
373 }
ocfs2_debug_release(struct inode * inode,struct file * file)374 static int ocfs2_debug_release(struct inode *inode, struct file *file)
375 {
376 	return 0;
377 }
ocfs2_debug_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)378 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
379 				size_t nbytes, loff_t *ppos)
380 {
381 	return 0;
382 }
383 #endif	/* CONFIG_DEBUG_FS */
384 
385 static const struct file_operations ocfs2_osb_debug_fops = {
386 	.open =		ocfs2_osb_debug_open,
387 	.release =	ocfs2_debug_release,
388 	.read =		ocfs2_debug_read,
389 	.llseek =	generic_file_llseek,
390 };
391 
ocfs2_sync_fs(struct super_block * sb,int wait)392 static int ocfs2_sync_fs(struct super_block *sb, int wait)
393 {
394 	int status;
395 	tid_t target;
396 	struct ocfs2_super *osb = OCFS2_SB(sb);
397 
398 	if (ocfs2_is_hard_readonly(osb))
399 		return -EROFS;
400 
401 	if (wait) {
402 		status = ocfs2_flush_truncate_log(osb);
403 		if (status < 0)
404 			mlog_errno(status);
405 	} else {
406 		ocfs2_schedule_truncate_log_flush(osb, 0);
407 	}
408 
409 	if (jbd2_journal_start_commit(osb->journal->j_journal,
410 				      &target)) {
411 		if (wait)
412 			jbd2_log_wait_commit(osb->journal->j_journal,
413 					     target);
414 	}
415 	return 0;
416 }
417 
ocfs2_need_system_inode(struct ocfs2_super * osb,int ino)418 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
419 {
420 	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
421 	    && (ino == USER_QUOTA_SYSTEM_INODE
422 		|| ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
423 		return 0;
424 	if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
425 	    && (ino == GROUP_QUOTA_SYSTEM_INODE
426 		|| ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
427 		return 0;
428 	return 1;
429 }
430 
ocfs2_init_global_system_inodes(struct ocfs2_super * osb)431 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
432 {
433 	struct inode *new = NULL;
434 	int status = 0;
435 	int i;
436 
437 	new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
438 	if (IS_ERR(new)) {
439 		status = PTR_ERR(new);
440 		mlog_errno(status);
441 		goto bail;
442 	}
443 	osb->root_inode = new;
444 
445 	new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
446 	if (IS_ERR(new)) {
447 		status = PTR_ERR(new);
448 		mlog_errno(status);
449 		goto bail;
450 	}
451 	osb->sys_root_inode = new;
452 
453 	for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
454 	     i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
455 		if (!ocfs2_need_system_inode(osb, i))
456 			continue;
457 		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
458 		if (!new) {
459 			ocfs2_release_system_inodes(osb);
460 			status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
461 			mlog_errno(status);
462 			mlog(ML_ERROR, "Unable to load system inode %d, "
463 			     "possibly corrupt fs?", i);
464 			goto bail;
465 		}
466 		// the array now has one ref, so drop this one
467 		iput(new);
468 	}
469 
470 bail:
471 	if (status)
472 		mlog_errno(status);
473 	return status;
474 }
475 
ocfs2_init_local_system_inodes(struct ocfs2_super * osb)476 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
477 {
478 	struct inode *new = NULL;
479 	int status = 0;
480 	int i;
481 
482 	for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
483 	     i < NUM_SYSTEM_INODES;
484 	     i++) {
485 		if (!ocfs2_need_system_inode(osb, i))
486 			continue;
487 		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
488 		if (!new) {
489 			ocfs2_release_system_inodes(osb);
490 			status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
491 			mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
492 			     status, i, osb->slot_num);
493 			goto bail;
494 		}
495 		/* the array now has one ref, so drop this one */
496 		iput(new);
497 	}
498 
499 bail:
500 	if (status)
501 		mlog_errno(status);
502 	return status;
503 }
504 
ocfs2_release_system_inodes(struct ocfs2_super * osb)505 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
506 {
507 	int i;
508 	struct inode *inode;
509 
510 	for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
511 		inode = osb->global_system_inodes[i];
512 		if (inode) {
513 			iput(inode);
514 			osb->global_system_inodes[i] = NULL;
515 		}
516 	}
517 
518 	inode = osb->sys_root_inode;
519 	if (inode) {
520 		iput(inode);
521 		osb->sys_root_inode = NULL;
522 	}
523 
524 	inode = osb->root_inode;
525 	if (inode) {
526 		iput(inode);
527 		osb->root_inode = NULL;
528 	}
529 
530 	if (!osb->local_system_inodes)
531 		return;
532 
533 	for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
534 		if (osb->local_system_inodes[i]) {
535 			iput(osb->local_system_inodes[i]);
536 			osb->local_system_inodes[i] = NULL;
537 		}
538 	}
539 
540 	kfree(osb->local_system_inodes);
541 	osb->local_system_inodes = NULL;
542 }
543 
544 /* We're allocating fs objects, use GFP_NOFS */
ocfs2_alloc_inode(struct super_block * sb)545 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
546 {
547 	struct ocfs2_inode_info *oi;
548 
549 	oi = alloc_inode_sb(sb, ocfs2_inode_cachep, GFP_NOFS);
550 	if (!oi)
551 		return NULL;
552 
553 	oi->i_sync_tid = 0;
554 	oi->i_datasync_tid = 0;
555 	memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));
556 
557 	jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
558 	return &oi->vfs_inode;
559 }
560 
ocfs2_free_inode(struct inode * inode)561 static void ocfs2_free_inode(struct inode *inode)
562 {
563 	kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
564 }
565 
ocfs2_max_file_offset(unsigned int bbits,unsigned int cbits)566 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
567 						unsigned int cbits)
568 {
569 	unsigned int bytes = 1 << cbits;
570 	unsigned int trim = bytes;
571 	unsigned int bitshift = 32;
572 
573 	/*
574 	 * i_size and all block offsets in ocfs2 are always 64 bits
575 	 * wide. i_clusters is 32 bits, in cluster-sized units. So on
576 	 * 64 bit platforms, cluster size will be the limiting factor.
577 	 */
578 
579 #if BITS_PER_LONG == 32
580 	BUILD_BUG_ON(sizeof(sector_t) != 8);
581 	/*
582 	 * We might be limited by page cache size.
583 	 */
584 	if (bytes > PAGE_SIZE) {
585 		bytes = PAGE_SIZE;
586 		trim = 1;
587 		/*
588 		 * Shift by 31 here so that we don't get larger than
589 		 * MAX_LFS_FILESIZE
590 		 */
591 		bitshift = 31;
592 	}
593 #endif
594 
595 	/*
596 	 * Trim by a whole cluster when we can actually approach the
597 	 * on-disk limits. Otherwise we can overflow i_clusters when
598 	 * an extent start is at the max offset.
599 	 */
600 	return (((unsigned long long)bytes) << bitshift) - trim;
601 }
602 
ocfs2_remount(struct super_block * sb,int * flags,char * data)603 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
604 {
605 	int incompat_features;
606 	int ret = 0;
607 	struct mount_options parsed_options;
608 	struct ocfs2_super *osb = OCFS2_SB(sb);
609 	u32 tmp;
610 
611 	sync_filesystem(sb);
612 
613 	if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
614 	    !ocfs2_check_set_options(sb, &parsed_options)) {
615 		ret = -EINVAL;
616 		goto out;
617 	}
618 
619 	tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
620 		OCFS2_MOUNT_HB_NONE;
621 	if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
622 		ret = -EINVAL;
623 		mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
624 		goto out;
625 	}
626 
627 	if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
628 	    (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
629 		ret = -EINVAL;
630 		mlog(ML_ERROR, "Cannot change data mode on remount\n");
631 		goto out;
632 	}
633 
634 	/* Probably don't want this on remount; it might
635 	 * mess with other nodes */
636 	if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
637 	    (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
638 		ret = -EINVAL;
639 		mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
640 		goto out;
641 	}
642 
643 	/* We're going to/from readonly mode. */
644 	if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
645 		/* Disable quota accounting before remounting RO */
646 		if (*flags & SB_RDONLY) {
647 			ret = ocfs2_susp_quotas(osb, 0);
648 			if (ret < 0)
649 				goto out;
650 		}
651 		/* Lock here so the check of HARD_RO and the potential
652 		 * setting of SOFT_RO is atomic. */
653 		spin_lock(&osb->osb_lock);
654 		if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
655 			mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
656 			ret = -EROFS;
657 			goto unlock_osb;
658 		}
659 
660 		if (*flags & SB_RDONLY) {
661 			sb->s_flags |= SB_RDONLY;
662 			osb->osb_flags |= OCFS2_OSB_SOFT_RO;
663 		} else {
664 			if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
665 				mlog(ML_ERROR, "Cannot remount RDWR "
666 				     "filesystem due to previous errors.\n");
667 				ret = -EROFS;
668 				goto unlock_osb;
669 			}
670 			incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
671 			if (incompat_features) {
672 				mlog(ML_ERROR, "Cannot remount RDWR because "
673 				     "of unsupported optional features "
674 				     "(%x).\n", incompat_features);
675 				ret = -EINVAL;
676 				goto unlock_osb;
677 			}
678 			sb->s_flags &= ~SB_RDONLY;
679 			osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
680 		}
681 		trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
682 unlock_osb:
683 		spin_unlock(&osb->osb_lock);
684 		/* Enable quota accounting after remounting RW */
685 		if (!ret && !(*flags & SB_RDONLY)) {
686 			if (sb_any_quota_suspended(sb))
687 				ret = ocfs2_susp_quotas(osb, 1);
688 			else
689 				ret = ocfs2_enable_quotas(osb);
690 			if (ret < 0) {
691 				/* Return back changes... */
692 				spin_lock(&osb->osb_lock);
693 				sb->s_flags |= SB_RDONLY;
694 				osb->osb_flags |= OCFS2_OSB_SOFT_RO;
695 				spin_unlock(&osb->osb_lock);
696 				goto out;
697 			}
698 		}
699 	}
700 
701 	if (!ret) {
702 		/* Only save off the new mount options in case of a successful
703 		 * remount. */
704 		osb->s_mount_opt = parsed_options.mount_opt;
705 		osb->s_atime_quantum = parsed_options.atime_quantum;
706 		osb->preferred_slot = parsed_options.slot;
707 		if (parsed_options.commit_interval)
708 			osb->osb_commit_interval = parsed_options.commit_interval;
709 
710 		if (!ocfs2_is_hard_readonly(osb))
711 			ocfs2_set_journal_params(osb);
712 
713 		sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
714 			((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
715 							SB_POSIXACL : 0);
716 	}
717 out:
718 	return ret;
719 }
720 
ocfs2_sb_probe(struct super_block * sb,struct buffer_head ** bh,int * sector_size,struct ocfs2_blockcheck_stats * stats)721 static int ocfs2_sb_probe(struct super_block *sb,
722 			  struct buffer_head **bh,
723 			  int *sector_size,
724 			  struct ocfs2_blockcheck_stats *stats)
725 {
726 	int status, tmpstat;
727 	struct ocfs1_vol_disk_hdr *hdr;
728 	struct ocfs2_dinode *di;
729 	int blksize;
730 
731 	*bh = NULL;
732 
733 	/* may be > 512 */
734 	*sector_size = bdev_logical_block_size(sb->s_bdev);
735 	if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
736 		mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
737 		     *sector_size, OCFS2_MAX_BLOCKSIZE);
738 		status = -EINVAL;
739 		goto bail;
740 	}
741 
742 	/* Can this really happen? */
743 	if (*sector_size < OCFS2_MIN_BLOCKSIZE)
744 		*sector_size = OCFS2_MIN_BLOCKSIZE;
745 
746 	/* check block zero for old format */
747 	status = ocfs2_get_sector(sb, bh, 0, *sector_size);
748 	if (status < 0) {
749 		mlog_errno(status);
750 		goto bail;
751 	}
752 	hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
753 	if (hdr->major_version == OCFS1_MAJOR_VERSION) {
754 		mlog(ML_ERROR, "incompatible version: %u.%u\n",
755 		     hdr->major_version, hdr->minor_version);
756 		status = -EINVAL;
757 	}
758 	if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
759 		   strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
760 		mlog(ML_ERROR, "incompatible volume signature: %8s\n",
761 		     hdr->signature);
762 		status = -EINVAL;
763 	}
764 	brelse(*bh);
765 	*bh = NULL;
766 	if (status < 0) {
767 		mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
768 		     "upgraded before mounting with ocfs v2\n");
769 		goto bail;
770 	}
771 
772 	/*
773 	 * Now check at magic offset for 512, 1024, 2048, 4096
774 	 * blocksizes.  4096 is the maximum blocksize because it is
775 	 * the minimum clustersize.
776 	 */
777 	status = -EINVAL;
778 	for (blksize = *sector_size;
779 	     blksize <= OCFS2_MAX_BLOCKSIZE;
780 	     blksize <<= 1) {
781 		tmpstat = ocfs2_get_sector(sb, bh,
782 					   OCFS2_SUPER_BLOCK_BLKNO,
783 					   blksize);
784 		if (tmpstat < 0) {
785 			status = tmpstat;
786 			mlog_errno(status);
787 			break;
788 		}
789 		di = (struct ocfs2_dinode *) (*bh)->b_data;
790 		memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
791 		spin_lock_init(&stats->b_lock);
792 		tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
793 		if (tmpstat < 0) {
794 			brelse(*bh);
795 			*bh = NULL;
796 		}
797 		if (tmpstat != -EAGAIN) {
798 			status = tmpstat;
799 			break;
800 		}
801 	}
802 
803 bail:
804 	return status;
805 }
806 
ocfs2_verify_heartbeat(struct ocfs2_super * osb)807 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
808 {
809 	u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
810 
811 	if (osb->s_mount_opt & hb_enabled) {
812 		if (ocfs2_mount_local(osb)) {
813 			mlog(ML_ERROR, "Cannot heartbeat on a locally "
814 			     "mounted device.\n");
815 			return -EINVAL;
816 		}
817 		if (ocfs2_userspace_stack(osb)) {
818 			mlog(ML_ERROR, "Userspace stack expected, but "
819 			     "o2cb heartbeat arguments passed to mount\n");
820 			return -EINVAL;
821 		}
822 		if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
823 		     !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
824 		    ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
825 		     ocfs2_cluster_o2cb_global_heartbeat(osb))) {
826 			mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
827 			return -EINVAL;
828 		}
829 	}
830 
831 	if (!(osb->s_mount_opt & hb_enabled)) {
832 		if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
833 		    !ocfs2_userspace_stack(osb)) {
834 			mlog(ML_ERROR, "Heartbeat has to be started to mount "
835 			     "a read-write clustered device.\n");
836 			return -EINVAL;
837 		}
838 	}
839 
840 	return 0;
841 }
842 
843 /*
844  * If we're using a userspace stack, mount should have passed
845  * a name that matches the disk.  If not, mount should not
846  * have passed a stack.
847  */
ocfs2_verify_userspace_stack(struct ocfs2_super * osb,struct mount_options * mopt)848 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
849 					struct mount_options *mopt)
850 {
851 	if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
852 		mlog(ML_ERROR,
853 		     "cluster stack passed to mount, but this filesystem "
854 		     "does not support it\n");
855 		return -EINVAL;
856 	}
857 
858 	if (ocfs2_userspace_stack(osb) &&
859 	    strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
860 		    OCFS2_STACK_LABEL_LEN)) {
861 		mlog(ML_ERROR,
862 		     "cluster stack passed to mount (\"%s\") does not "
863 		     "match the filesystem (\"%s\")\n",
864 		     mopt->cluster_stack,
865 		     osb->osb_cluster_stack);
866 		return -EINVAL;
867 	}
868 
869 	return 0;
870 }
871 
ocfs2_susp_quotas(struct ocfs2_super * osb,int unsuspend)872 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
873 {
874 	int type;
875 	struct super_block *sb = osb->sb;
876 	unsigned int feature[OCFS2_MAXQUOTAS] = {
877 					OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
878 					OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
879 	int status = 0;
880 
881 	for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
882 		if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
883 			continue;
884 		if (unsuspend)
885 			status = dquot_resume(sb, type);
886 		else {
887 			struct ocfs2_mem_dqinfo *oinfo;
888 
889 			/* Cancel periodic syncing before suspending */
890 			oinfo = sb_dqinfo(sb, type)->dqi_priv;
891 			cancel_delayed_work_sync(&oinfo->dqi_sync_work);
892 			status = dquot_suspend(sb, type);
893 		}
894 		if (status < 0)
895 			break;
896 	}
897 	if (status < 0)
898 		mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
899 		     "remount (error = %d).\n", status);
900 	return status;
901 }
902 
ocfs2_enable_quotas(struct ocfs2_super * osb)903 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
904 {
905 	struct inode *inode[OCFS2_MAXQUOTAS] = { NULL, NULL };
906 	struct super_block *sb = osb->sb;
907 	unsigned int feature[OCFS2_MAXQUOTAS] = {
908 					OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
909 					OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
910 	unsigned int ino[OCFS2_MAXQUOTAS] = {
911 					LOCAL_USER_QUOTA_SYSTEM_INODE,
912 					LOCAL_GROUP_QUOTA_SYSTEM_INODE };
913 	int status;
914 	int type;
915 
916 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
917 	for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
918 		if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
919 			continue;
920 		inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
921 							osb->slot_num);
922 		if (!inode[type]) {
923 			status = -ENOENT;
924 			goto out_quota_off;
925 		}
926 		status = dquot_load_quota_inode(inode[type], type, QFMT_OCFS2,
927 						DQUOT_USAGE_ENABLED);
928 		if (status < 0)
929 			goto out_quota_off;
930 	}
931 
932 	for (type = 0; type < OCFS2_MAXQUOTAS; type++)
933 		iput(inode[type]);
934 	return 0;
935 out_quota_off:
936 	ocfs2_disable_quotas(osb);
937 	for (type = 0; type < OCFS2_MAXQUOTAS; type++)
938 		iput(inode[type]);
939 	mlog_errno(status);
940 	return status;
941 }
942 
ocfs2_disable_quotas(struct ocfs2_super * osb)943 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
944 {
945 	int type;
946 	struct inode *inode;
947 	struct super_block *sb = osb->sb;
948 	struct ocfs2_mem_dqinfo *oinfo;
949 
950 	/* We mostly ignore errors in this function because there's not much
951 	 * we can do when we see them */
952 	for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
953 		if (!sb_has_quota_loaded(sb, type))
954 			continue;
955 		oinfo = sb_dqinfo(sb, type)->dqi_priv;
956 		cancel_delayed_work_sync(&oinfo->dqi_sync_work);
957 		inode = igrab(sb->s_dquot.files[type]);
958 		/* Turn off quotas. This will remove all dquot structures from
959 		 * memory and so they will be automatically synced to global
960 		 * quota files */
961 		dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
962 					DQUOT_LIMITS_ENABLED);
963 		iput(inode);
964 	}
965 }
966 
ocfs2_fill_super(struct super_block * sb,void * data,int silent)967 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
968 {
969 	struct dentry *root;
970 	int status, sector_size;
971 	struct mount_options parsed_options;
972 	struct inode *inode = NULL;
973 	struct ocfs2_super *osb = NULL;
974 	struct buffer_head *bh = NULL;
975 	char nodestr[12];
976 	struct ocfs2_blockcheck_stats stats;
977 
978 	trace_ocfs2_fill_super(sb, data, silent);
979 
980 	if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
981 		status = -EINVAL;
982 		goto out;
983 	}
984 
985 	/* probe for superblock */
986 	status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
987 	if (status < 0) {
988 		mlog(ML_ERROR, "superblock probe failed!\n");
989 		goto out;
990 	}
991 
992 	status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
993 	brelse(bh);
994 	bh = NULL;
995 	if (status < 0)
996 		goto out;
997 
998 	osb = OCFS2_SB(sb);
999 
1000 	if (!ocfs2_check_set_options(sb, &parsed_options)) {
1001 		status = -EINVAL;
1002 		goto out_super;
1003 	}
1004 	osb->s_mount_opt = parsed_options.mount_opt;
1005 	osb->s_atime_quantum = parsed_options.atime_quantum;
1006 	osb->preferred_slot = parsed_options.slot;
1007 	osb->osb_commit_interval = parsed_options.commit_interval;
1008 
1009 	ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1010 	osb->osb_resv_level = parsed_options.resv_level;
1011 	osb->osb_dir_resv_level = parsed_options.resv_level;
1012 	if (parsed_options.dir_resv_level == -1)
1013 		osb->osb_dir_resv_level = parsed_options.resv_level;
1014 	else
1015 		osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1016 
1017 	status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1018 	if (status)
1019 		goto out_super;
1020 
1021 	sb->s_magic = OCFS2_SUPER_MAGIC;
1022 
1023 	sb->s_flags = (sb->s_flags & ~(SB_POSIXACL | SB_NOSEC)) |
1024 		((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1025 
1026 	/* Hard readonly mode only if: bdev_read_only, SB_RDONLY,
1027 	 * heartbeat=none */
1028 	if (bdev_read_only(sb->s_bdev)) {
1029 		if (!sb_rdonly(sb)) {
1030 			status = -EACCES;
1031 			mlog(ML_ERROR, "Readonly device detected but readonly "
1032 			     "mount was not specified.\n");
1033 			goto out_super;
1034 		}
1035 
1036 		/* You should not be able to start a local heartbeat
1037 		 * on a readonly device. */
1038 		if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1039 			status = -EROFS;
1040 			mlog(ML_ERROR, "Local heartbeat specified on readonly "
1041 			     "device.\n");
1042 			goto out_super;
1043 		}
1044 
1045 		status = ocfs2_check_journals_nolocks(osb);
1046 		if (status < 0) {
1047 			if (status == -EROFS)
1048 				mlog(ML_ERROR, "Recovery required on readonly "
1049 				     "file system, but write access is "
1050 				     "unavailable.\n");
1051 			goto out_super;
1052 		}
1053 
1054 		ocfs2_set_ro_flag(osb, 1);
1055 
1056 		printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1057 		       "Cluster services will not be used for this mount. "
1058 		       "Recovery will be skipped.\n", osb->dev_str);
1059 	}
1060 
1061 	if (!ocfs2_is_hard_readonly(osb)) {
1062 		if (sb_rdonly(sb))
1063 			ocfs2_set_ro_flag(osb, 0);
1064 	}
1065 
1066 	status = ocfs2_verify_heartbeat(osb);
1067 	if (status < 0)
1068 		goto out_super;
1069 
1070 	osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1071 						 ocfs2_debugfs_root);
1072 
1073 	debugfs_create_file("fs_state", S_IFREG|S_IRUSR, osb->osb_debug_root,
1074 			    osb, &ocfs2_osb_debug_fops);
1075 
1076 	if (ocfs2_meta_ecc(osb))
1077 		ocfs2_blockcheck_stats_debugfs_install( &osb->osb_ecc_stats,
1078 							osb->osb_debug_root);
1079 
1080 	status = ocfs2_mount_volume(sb);
1081 	if (status < 0)
1082 		goto out_debugfs;
1083 
1084 	if (osb->root_inode)
1085 		inode = igrab(osb->root_inode);
1086 
1087 	if (!inode) {
1088 		status = -EIO;
1089 		goto out_dismount;
1090 	}
1091 
1092 	osb->osb_dev_kset = kset_create_and_add(sb->s_id, NULL,
1093 						&ocfs2_kset->kobj);
1094 	if (!osb->osb_dev_kset) {
1095 		status = -ENOMEM;
1096 		mlog(ML_ERROR, "Unable to create device kset %s.\n", sb->s_id);
1097 		goto out_dismount;
1098 	}
1099 
1100 	/* Create filecheck sysfs related directories/files at
1101 	 * /sys/fs/ocfs2/<devname>/filecheck */
1102 	if (ocfs2_filecheck_create_sysfs(osb)) {
1103 		status = -ENOMEM;
1104 		mlog(ML_ERROR, "Unable to create filecheck sysfs directory at "
1105 			"/sys/fs/ocfs2/%s/filecheck.\n", sb->s_id);
1106 		goto out_dismount;
1107 	}
1108 
1109 	root = d_make_root(inode);
1110 	if (!root) {
1111 		status = -ENOMEM;
1112 		goto out_dismount;
1113 	}
1114 
1115 	sb->s_root = root;
1116 
1117 	ocfs2_complete_mount_recovery(osb);
1118 
1119 	if (ocfs2_mount_local(osb))
1120 		snprintf(nodestr, sizeof(nodestr), "local");
1121 	else
1122 		snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1123 
1124 	printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1125 	       "with %s data mode.\n",
1126 	       osb->dev_str, nodestr, osb->slot_num,
1127 	       osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1128 	       "ordered");
1129 
1130 	atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1131 	wake_up(&osb->osb_mount_event);
1132 
1133 	/* Now we can initialize quotas because we can afford to wait
1134 	 * for cluster locks recovery now. That also means that truncation
1135 	 * log recovery can happen but that waits for proper quota setup */
1136 	if (!sb_rdonly(sb)) {
1137 		status = ocfs2_enable_quotas(osb);
1138 		if (status < 0) {
1139 			/* We have to err-out specially here because
1140 			 * s_root is already set */
1141 			mlog_errno(status);
1142 			atomic_set(&osb->vol_state, VOLUME_DISABLED);
1143 			wake_up(&osb->osb_mount_event);
1144 			return status;
1145 		}
1146 	}
1147 
1148 	ocfs2_complete_quota_recovery(osb);
1149 
1150 	/* Now we wake up again for processes waiting for quotas */
1151 	atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1152 	wake_up(&osb->osb_mount_event);
1153 
1154 	/* Start this when the mount is almost sure of being successful */
1155 	ocfs2_orphan_scan_start(osb);
1156 
1157 	return status;
1158 
1159 out_dismount:
1160 	atomic_set(&osb->vol_state, VOLUME_DISABLED);
1161 	wake_up(&osb->osb_mount_event);
1162 	ocfs2_free_replay_slots(osb);
1163 	ocfs2_dismount_volume(sb, 1);
1164 	goto out;
1165 
1166 out_debugfs:
1167 	debugfs_remove_recursive(osb->osb_debug_root);
1168 out_super:
1169 	ocfs2_release_system_inodes(osb);
1170 	kfree(osb->recovery_map);
1171 	ocfs2_delete_osb(osb);
1172 	kfree(osb);
1173 out:
1174 	mlog_errno(status);
1175 
1176 	return status;
1177 }
1178 
ocfs2_mount(struct file_system_type * fs_type,int flags,const char * dev_name,void * data)1179 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1180 			int flags,
1181 			const char *dev_name,
1182 			void *data)
1183 {
1184 	return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1185 }
1186 
1187 static struct file_system_type ocfs2_fs_type = {
1188 	.owner          = THIS_MODULE,
1189 	.name           = "ocfs2",
1190 	.mount          = ocfs2_mount,
1191 	.kill_sb        = kill_block_super,
1192 	.fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1193 	.next           = NULL
1194 };
1195 MODULE_ALIAS_FS("ocfs2");
1196 
ocfs2_check_set_options(struct super_block * sb,struct mount_options * options)1197 static int ocfs2_check_set_options(struct super_block *sb,
1198 				   struct mount_options *options)
1199 {
1200 	if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1201 	    !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1202 					 OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1203 		mlog(ML_ERROR, "User quotas were requested, but this "
1204 		     "filesystem does not have the feature enabled.\n");
1205 		return 0;
1206 	}
1207 	if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1208 	    !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1209 					 OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1210 		mlog(ML_ERROR, "Group quotas were requested, but this "
1211 		     "filesystem does not have the feature enabled.\n");
1212 		return 0;
1213 	}
1214 	if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1215 	    !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1216 		mlog(ML_ERROR, "ACL support requested but extended attributes "
1217 		     "feature is not enabled\n");
1218 		return 0;
1219 	}
1220 	/* No ACL setting specified? Use XATTR feature... */
1221 	if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1222 				    OCFS2_MOUNT_NO_POSIX_ACL))) {
1223 		if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1224 			options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1225 		else
1226 			options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1227 	}
1228 	return 1;
1229 }
1230 
ocfs2_parse_options(struct super_block * sb,char * options,struct mount_options * mopt,int is_remount)1231 static int ocfs2_parse_options(struct super_block *sb,
1232 			       char *options,
1233 			       struct mount_options *mopt,
1234 			       int is_remount)
1235 {
1236 	int status, user_stack = 0;
1237 	char *p;
1238 	u32 tmp;
1239 	int token, option;
1240 	substring_t args[MAX_OPT_ARGS];
1241 
1242 	trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1243 
1244 	mopt->commit_interval = 0;
1245 	mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1246 	mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1247 	mopt->slot = OCFS2_INVALID_SLOT;
1248 	mopt->localalloc_opt = -1;
1249 	mopt->cluster_stack[0] = '\0';
1250 	mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1251 	mopt->dir_resv_level = -1;
1252 
1253 	if (!options) {
1254 		status = 1;
1255 		goto bail;
1256 	}
1257 
1258 	while ((p = strsep(&options, ",")) != NULL) {
1259 		if (!*p)
1260 			continue;
1261 
1262 		token = match_token(p, tokens, args);
1263 		switch (token) {
1264 		case Opt_hb_local:
1265 			mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1266 			break;
1267 		case Opt_hb_none:
1268 			mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1269 			break;
1270 		case Opt_hb_global:
1271 			mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1272 			break;
1273 		case Opt_barrier:
1274 			if (match_int(&args[0], &option)) {
1275 				status = 0;
1276 				goto bail;
1277 			}
1278 			if (option)
1279 				mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1280 			else
1281 				mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1282 			break;
1283 		case Opt_intr:
1284 			mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1285 			break;
1286 		case Opt_nointr:
1287 			mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1288 			break;
1289 		case Opt_err_panic:
1290 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1291 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1292 			mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1293 			break;
1294 		case Opt_err_ro:
1295 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1296 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1297 			mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
1298 			break;
1299 		case Opt_err_cont:
1300 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1301 			mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1302 			mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
1303 			break;
1304 		case Opt_data_ordered:
1305 			mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1306 			break;
1307 		case Opt_data_writeback:
1308 			mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1309 			break;
1310 		case Opt_user_xattr:
1311 			mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1312 			break;
1313 		case Opt_nouser_xattr:
1314 			mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1315 			break;
1316 		case Opt_atime_quantum:
1317 			if (match_int(&args[0], &option)) {
1318 				status = 0;
1319 				goto bail;
1320 			}
1321 			if (option >= 0)
1322 				mopt->atime_quantum = option;
1323 			break;
1324 		case Opt_slot:
1325 			if (match_int(&args[0], &option)) {
1326 				status = 0;
1327 				goto bail;
1328 			}
1329 			if (option)
1330 				mopt->slot = (u16)option;
1331 			break;
1332 		case Opt_commit:
1333 			if (match_int(&args[0], &option)) {
1334 				status = 0;
1335 				goto bail;
1336 			}
1337 			if (option < 0)
1338 				return 0;
1339 			if (option == 0)
1340 				option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1341 			mopt->commit_interval = HZ * option;
1342 			break;
1343 		case Opt_localalloc:
1344 			if (match_int(&args[0], &option)) {
1345 				status = 0;
1346 				goto bail;
1347 			}
1348 			if (option >= 0)
1349 				mopt->localalloc_opt = option;
1350 			break;
1351 		case Opt_localflocks:
1352 			/*
1353 			 * Changing this during remount could race
1354 			 * flock() requests, or "unbalance" existing
1355 			 * ones (e.g., a lock is taken in one mode but
1356 			 * dropped in the other). If users care enough
1357 			 * to flip locking modes during remount, we
1358 			 * could add a "local" flag to individual
1359 			 * flock structures for proper tracking of
1360 			 * state.
1361 			 */
1362 			if (!is_remount)
1363 				mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1364 			break;
1365 		case Opt_stack:
1366 			/* Check both that the option we were passed
1367 			 * is of the right length and that it is a proper
1368 			 * string of the right length.
1369 			 */
1370 			if (((args[0].to - args[0].from) !=
1371 			     OCFS2_STACK_LABEL_LEN) ||
1372 			    (strnlen(args[0].from,
1373 				     OCFS2_STACK_LABEL_LEN) !=
1374 			     OCFS2_STACK_LABEL_LEN)) {
1375 				mlog(ML_ERROR,
1376 				     "Invalid cluster_stack option\n");
1377 				status = 0;
1378 				goto bail;
1379 			}
1380 			memcpy(mopt->cluster_stack, args[0].from,
1381 			       OCFS2_STACK_LABEL_LEN);
1382 			mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1383 			/*
1384 			 * Open code the memcmp here as we don't have
1385 			 * an osb to pass to
1386 			 * ocfs2_userspace_stack().
1387 			 */
1388 			if (memcmp(mopt->cluster_stack,
1389 				   OCFS2_CLASSIC_CLUSTER_STACK,
1390 				   OCFS2_STACK_LABEL_LEN))
1391 				user_stack = 1;
1392 			break;
1393 		case Opt_inode64:
1394 			mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1395 			break;
1396 		case Opt_usrquota:
1397 			mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1398 			break;
1399 		case Opt_grpquota:
1400 			mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1401 			break;
1402 		case Opt_coherency_buffered:
1403 			mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1404 			break;
1405 		case Opt_coherency_full:
1406 			mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1407 			break;
1408 		case Opt_acl:
1409 			mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1410 			mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1411 			break;
1412 		case Opt_noacl:
1413 			mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1414 			mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1415 			break;
1416 		case Opt_resv_level:
1417 			if (is_remount)
1418 				break;
1419 			if (match_int(&args[0], &option)) {
1420 				status = 0;
1421 				goto bail;
1422 			}
1423 			if (option >= OCFS2_MIN_RESV_LEVEL &&
1424 			    option < OCFS2_MAX_RESV_LEVEL)
1425 				mopt->resv_level = option;
1426 			break;
1427 		case Opt_dir_resv_level:
1428 			if (is_remount)
1429 				break;
1430 			if (match_int(&args[0], &option)) {
1431 				status = 0;
1432 				goto bail;
1433 			}
1434 			if (option >= OCFS2_MIN_RESV_LEVEL &&
1435 			    option < OCFS2_MAX_RESV_LEVEL)
1436 				mopt->dir_resv_level = option;
1437 			break;
1438 		case Opt_journal_async_commit:
1439 			mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
1440 			break;
1441 		default:
1442 			mlog(ML_ERROR,
1443 			     "Unrecognized mount option \"%s\" "
1444 			     "or missing value\n", p);
1445 			status = 0;
1446 			goto bail;
1447 		}
1448 	}
1449 
1450 	if (user_stack == 0) {
1451 		/* Ensure only one heartbeat mode */
1452 		tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1453 					 OCFS2_MOUNT_HB_GLOBAL |
1454 					 OCFS2_MOUNT_HB_NONE);
1455 		if (hweight32(tmp) != 1) {
1456 			mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1457 			status = 0;
1458 			goto bail;
1459 		}
1460 	}
1461 
1462 	status = 1;
1463 
1464 bail:
1465 	return status;
1466 }
1467 
ocfs2_show_options(struct seq_file * s,struct dentry * root)1468 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1469 {
1470 	struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1471 	unsigned long opts = osb->s_mount_opt;
1472 	unsigned int local_alloc_megs;
1473 
1474 	if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1475 		seq_printf(s, ",_netdev");
1476 		if (opts & OCFS2_MOUNT_HB_LOCAL)
1477 			seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1478 		else
1479 			seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1480 	} else
1481 		seq_printf(s, ",%s", OCFS2_HB_NONE);
1482 
1483 	if (opts & OCFS2_MOUNT_NOINTR)
1484 		seq_printf(s, ",nointr");
1485 
1486 	if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1487 		seq_printf(s, ",data=writeback");
1488 	else
1489 		seq_printf(s, ",data=ordered");
1490 
1491 	if (opts & OCFS2_MOUNT_BARRIER)
1492 		seq_printf(s, ",barrier=1");
1493 
1494 	if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1495 		seq_printf(s, ",errors=panic");
1496 	else if (opts & OCFS2_MOUNT_ERRORS_CONT)
1497 		seq_printf(s, ",errors=continue");
1498 	else
1499 		seq_printf(s, ",errors=remount-ro");
1500 
1501 	if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1502 		seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1503 
1504 	seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1505 
1506 	if (osb->osb_commit_interval)
1507 		seq_printf(s, ",commit=%u",
1508 			   (unsigned) (osb->osb_commit_interval / HZ));
1509 
1510 	local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1511 	if (local_alloc_megs != ocfs2_la_default_mb(osb))
1512 		seq_printf(s, ",localalloc=%d", local_alloc_megs);
1513 
1514 	if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1515 		seq_printf(s, ",localflocks,");
1516 
1517 	if (osb->osb_cluster_stack[0])
1518 		seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
1519 				  OCFS2_STACK_LABEL_LEN);
1520 	if (opts & OCFS2_MOUNT_USRQUOTA)
1521 		seq_printf(s, ",usrquota");
1522 	if (opts & OCFS2_MOUNT_GRPQUOTA)
1523 		seq_printf(s, ",grpquota");
1524 
1525 	if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1526 		seq_printf(s, ",coherency=buffered");
1527 	else
1528 		seq_printf(s, ",coherency=full");
1529 
1530 	if (opts & OCFS2_MOUNT_NOUSERXATTR)
1531 		seq_printf(s, ",nouser_xattr");
1532 	else
1533 		seq_printf(s, ",user_xattr");
1534 
1535 	if (opts & OCFS2_MOUNT_INODE64)
1536 		seq_printf(s, ",inode64");
1537 
1538 	if (opts & OCFS2_MOUNT_POSIX_ACL)
1539 		seq_printf(s, ",acl");
1540 	else
1541 		seq_printf(s, ",noacl");
1542 
1543 	if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1544 		seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1545 
1546 	if (osb->osb_dir_resv_level != osb->osb_resv_level)
1547 		seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1548 
1549 	if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
1550 		seq_printf(s, ",journal_async_commit");
1551 
1552 	return 0;
1553 }
1554 
ocfs2_init(void)1555 static int __init ocfs2_init(void)
1556 {
1557 	int status;
1558 
1559 	status = init_ocfs2_uptodate_cache();
1560 	if (status < 0)
1561 		goto out1;
1562 
1563 	status = ocfs2_initialize_mem_caches();
1564 	if (status < 0)
1565 		goto out2;
1566 
1567 	ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1568 
1569 	ocfs2_set_locking_protocol();
1570 
1571 	status = register_quota_format(&ocfs2_quota_format);
1572 	if (status < 0)
1573 		goto out3;
1574 	status = register_filesystem(&ocfs2_fs_type);
1575 	if (!status)
1576 		return 0;
1577 
1578 	unregister_quota_format(&ocfs2_quota_format);
1579 out3:
1580 	debugfs_remove(ocfs2_debugfs_root);
1581 	ocfs2_free_mem_caches();
1582 out2:
1583 	exit_ocfs2_uptodate_cache();
1584 out1:
1585 	mlog_errno(status);
1586 	return status;
1587 }
1588 
ocfs2_exit(void)1589 static void __exit ocfs2_exit(void)
1590 {
1591 	unregister_quota_format(&ocfs2_quota_format);
1592 
1593 	debugfs_remove(ocfs2_debugfs_root);
1594 
1595 	ocfs2_free_mem_caches();
1596 
1597 	unregister_filesystem(&ocfs2_fs_type);
1598 
1599 	exit_ocfs2_uptodate_cache();
1600 }
1601 
ocfs2_put_super(struct super_block * sb)1602 static void ocfs2_put_super(struct super_block *sb)
1603 {
1604 	trace_ocfs2_put_super(sb);
1605 
1606 	ocfs2_sync_blockdev(sb);
1607 	ocfs2_dismount_volume(sb, 0);
1608 }
1609 
ocfs2_statfs(struct dentry * dentry,struct kstatfs * buf)1610 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1611 {
1612 	struct ocfs2_super *osb;
1613 	u32 numbits, freebits;
1614 	int status;
1615 	struct ocfs2_dinode *bm_lock;
1616 	struct buffer_head *bh = NULL;
1617 	struct inode *inode = NULL;
1618 
1619 	trace_ocfs2_statfs(dentry->d_sb, buf);
1620 
1621 	osb = OCFS2_SB(dentry->d_sb);
1622 
1623 	inode = ocfs2_get_system_file_inode(osb,
1624 					    GLOBAL_BITMAP_SYSTEM_INODE,
1625 					    OCFS2_INVALID_SLOT);
1626 	if (!inode) {
1627 		mlog(ML_ERROR, "failed to get bitmap inode\n");
1628 		status = -EIO;
1629 		goto bail;
1630 	}
1631 
1632 	status = ocfs2_inode_lock(inode, &bh, 0);
1633 	if (status < 0) {
1634 		mlog_errno(status);
1635 		goto bail;
1636 	}
1637 
1638 	bm_lock = (struct ocfs2_dinode *) bh->b_data;
1639 
1640 	numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1641 	freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1642 
1643 	buf->f_type = OCFS2_SUPER_MAGIC;
1644 	buf->f_bsize = dentry->d_sb->s_blocksize;
1645 	buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1646 	buf->f_blocks = ((sector_t) numbits) *
1647 			(osb->s_clustersize >> osb->sb->s_blocksize_bits);
1648 	buf->f_bfree = ((sector_t) freebits) *
1649 		       (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1650 	buf->f_bavail = buf->f_bfree;
1651 	buf->f_files = numbits;
1652 	buf->f_ffree = freebits;
1653 	buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1654 				& 0xFFFFFFFFUL;
1655 	buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1656 				OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1657 
1658 	brelse(bh);
1659 
1660 	ocfs2_inode_unlock(inode, 0);
1661 	status = 0;
1662 bail:
1663 	iput(inode);
1664 
1665 	if (status)
1666 		mlog_errno(status);
1667 
1668 	return status;
1669 }
1670 
ocfs2_inode_init_once(void * data)1671 static void ocfs2_inode_init_once(void *data)
1672 {
1673 	struct ocfs2_inode_info *oi = data;
1674 
1675 	oi->ip_flags = 0;
1676 	oi->ip_open_count = 0;
1677 	spin_lock_init(&oi->ip_lock);
1678 	ocfs2_extent_map_init(&oi->vfs_inode);
1679 	INIT_LIST_HEAD(&oi->ip_io_markers);
1680 	INIT_LIST_HEAD(&oi->ip_unwritten_list);
1681 	oi->ip_dir_start_lookup = 0;
1682 	init_rwsem(&oi->ip_alloc_sem);
1683 	init_rwsem(&oi->ip_xattr_sem);
1684 	mutex_init(&oi->ip_io_mutex);
1685 
1686 	oi->ip_blkno = 0ULL;
1687 	oi->ip_clusters = 0;
1688 	oi->ip_next_orphan = NULL;
1689 
1690 	ocfs2_resv_init_once(&oi->ip_la_data_resv);
1691 
1692 	ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1693 	ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1694 	ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1695 
1696 	ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1697 				  &ocfs2_inode_caching_ops);
1698 
1699 	inode_init_once(&oi->vfs_inode);
1700 }
1701 
ocfs2_initialize_mem_caches(void)1702 static int ocfs2_initialize_mem_caches(void)
1703 {
1704 	ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1705 				       sizeof(struct ocfs2_inode_info),
1706 				       0,
1707 				       (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1708 						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1709 				       ocfs2_inode_init_once);
1710 	ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1711 					sizeof(struct ocfs2_dquot),
1712 					0,
1713 					(SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1714 						SLAB_MEM_SPREAD),
1715 					NULL);
1716 	ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1717 					sizeof(struct ocfs2_quota_chunk),
1718 					0,
1719 					(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1720 					NULL);
1721 	if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1722 	    !ocfs2_qf_chunk_cachep) {
1723 		kmem_cache_destroy(ocfs2_inode_cachep);
1724 		kmem_cache_destroy(ocfs2_dquot_cachep);
1725 		kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1726 		return -ENOMEM;
1727 	}
1728 
1729 	return 0;
1730 }
1731 
ocfs2_free_mem_caches(void)1732 static void ocfs2_free_mem_caches(void)
1733 {
1734 	/*
1735 	 * Make sure all delayed rcu free inodes are flushed before we
1736 	 * destroy cache.
1737 	 */
1738 	rcu_barrier();
1739 	kmem_cache_destroy(ocfs2_inode_cachep);
1740 	ocfs2_inode_cachep = NULL;
1741 
1742 	kmem_cache_destroy(ocfs2_dquot_cachep);
1743 	ocfs2_dquot_cachep = NULL;
1744 
1745 	kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1746 	ocfs2_qf_chunk_cachep = NULL;
1747 }
1748 
ocfs2_get_sector(struct super_block * sb,struct buffer_head ** bh,int block,int sect_size)1749 static int ocfs2_get_sector(struct super_block *sb,
1750 			    struct buffer_head **bh,
1751 			    int block,
1752 			    int sect_size)
1753 {
1754 	if (!sb_set_blocksize(sb, sect_size)) {
1755 		mlog(ML_ERROR, "unable to set blocksize\n");
1756 		return -EIO;
1757 	}
1758 
1759 	*bh = sb_getblk(sb, block);
1760 	if (!*bh) {
1761 		mlog_errno(-ENOMEM);
1762 		return -ENOMEM;
1763 	}
1764 	lock_buffer(*bh);
1765 	if (!buffer_dirty(*bh))
1766 		clear_buffer_uptodate(*bh);
1767 	unlock_buffer(*bh);
1768 	if (bh_read(*bh, 0) < 0) {
1769 		mlog_errno(-EIO);
1770 		brelse(*bh);
1771 		*bh = NULL;
1772 		return -EIO;
1773 	}
1774 
1775 	return 0;
1776 }
1777 
ocfs2_mount_volume(struct super_block * sb)1778 static int ocfs2_mount_volume(struct super_block *sb)
1779 {
1780 	int status = 0;
1781 	struct ocfs2_super *osb = OCFS2_SB(sb);
1782 
1783 	if (ocfs2_is_hard_readonly(osb))
1784 		goto out;
1785 
1786 	mutex_init(&osb->obs_trim_fs_mutex);
1787 
1788 	status = ocfs2_dlm_init(osb);
1789 	if (status < 0) {
1790 		mlog_errno(status);
1791 		if (status == -EBADR && ocfs2_userspace_stack(osb))
1792 			mlog(ML_ERROR, "couldn't mount because cluster name on"
1793 			" disk does not match the running cluster name.\n");
1794 		goto out;
1795 	}
1796 
1797 	status = ocfs2_super_lock(osb, 1);
1798 	if (status < 0) {
1799 		mlog_errno(status);
1800 		goto out_dlm;
1801 	}
1802 
1803 	/* This will load up the node map and add ourselves to it. */
1804 	status = ocfs2_find_slot(osb);
1805 	if (status < 0) {
1806 		mlog_errno(status);
1807 		goto out_super_lock;
1808 	}
1809 
1810 	/* load all node-local system inodes */
1811 	status = ocfs2_init_local_system_inodes(osb);
1812 	if (status < 0) {
1813 		mlog_errno(status);
1814 		goto out_super_lock;
1815 	}
1816 
1817 	status = ocfs2_check_volume(osb);
1818 	if (status < 0) {
1819 		mlog_errno(status);
1820 		goto out_system_inodes;
1821 	}
1822 
1823 	status = ocfs2_truncate_log_init(osb);
1824 	if (status < 0) {
1825 		mlog_errno(status);
1826 		goto out_check_volume;
1827 	}
1828 
1829 	ocfs2_super_unlock(osb, 1);
1830 	return 0;
1831 
1832 out_check_volume:
1833 	ocfs2_free_replay_slots(osb);
1834 out_system_inodes:
1835 	if (osb->local_alloc_state == OCFS2_LA_ENABLED)
1836 		ocfs2_shutdown_local_alloc(osb);
1837 	ocfs2_release_system_inodes(osb);
1838 	/* before journal shutdown, we should release slot_info */
1839 	ocfs2_free_slot_info(osb);
1840 	ocfs2_journal_shutdown(osb);
1841 out_super_lock:
1842 	ocfs2_super_unlock(osb, 1);
1843 out_dlm:
1844 	ocfs2_dlm_shutdown(osb, 0);
1845 out:
1846 	return status;
1847 }
1848 
ocfs2_dismount_volume(struct super_block * sb,int mnt_err)1849 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1850 {
1851 	int tmp, hangup_needed = 0;
1852 	struct ocfs2_super *osb = NULL;
1853 	char nodestr[12];
1854 
1855 	trace_ocfs2_dismount_volume(sb);
1856 
1857 	BUG_ON(!sb);
1858 	osb = OCFS2_SB(sb);
1859 	BUG_ON(!osb);
1860 
1861 	/* Remove file check sysfs related directores/files,
1862 	 * and wait for the pending file check operations */
1863 	ocfs2_filecheck_remove_sysfs(osb);
1864 
1865 	kset_unregister(osb->osb_dev_kset);
1866 
1867 	/* Orphan scan should be stopped as early as possible */
1868 	ocfs2_orphan_scan_stop(osb);
1869 
1870 	ocfs2_disable_quotas(osb);
1871 
1872 	/* All dquots should be freed by now */
1873 	WARN_ON(!llist_empty(&osb->dquot_drop_list));
1874 	/* Wait for worker to be done with the work structure in osb */
1875 	cancel_work_sync(&osb->dquot_drop_work);
1876 
1877 	ocfs2_shutdown_local_alloc(osb);
1878 
1879 	ocfs2_truncate_log_shutdown(osb);
1880 
1881 	/* This will disable recovery and flush any recovery work. */
1882 	ocfs2_recovery_exit(osb);
1883 
1884 	ocfs2_sync_blockdev(sb);
1885 
1886 	ocfs2_purge_refcount_trees(osb);
1887 
1888 	/* No cluster connection means we've failed during mount, so skip
1889 	 * all the steps which depended on that to complete. */
1890 	if (osb->cconn) {
1891 		tmp = ocfs2_super_lock(osb, 1);
1892 		if (tmp < 0) {
1893 			mlog_errno(tmp);
1894 			return;
1895 		}
1896 	}
1897 
1898 	if (osb->slot_num != OCFS2_INVALID_SLOT)
1899 		ocfs2_put_slot(osb);
1900 
1901 	if (osb->cconn)
1902 		ocfs2_super_unlock(osb, 1);
1903 
1904 	ocfs2_release_system_inodes(osb);
1905 
1906 	ocfs2_journal_shutdown(osb);
1907 
1908 	/*
1909 	 * If we're dismounting due to mount error, mount.ocfs2 will clean
1910 	 * up heartbeat.  If we're a local mount, there is no heartbeat.
1911 	 * If we failed before we got a uuid_str yet, we can't stop
1912 	 * heartbeat.  Otherwise, do it.
1913 	 */
1914 	if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1915 	    !ocfs2_is_hard_readonly(osb))
1916 		hangup_needed = 1;
1917 
1918 	ocfs2_dlm_shutdown(osb, hangup_needed);
1919 
1920 	ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1921 	debugfs_remove_recursive(osb->osb_debug_root);
1922 
1923 	if (hangup_needed)
1924 		ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1925 
1926 	atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1927 
1928 	if (ocfs2_mount_local(osb))
1929 		snprintf(nodestr, sizeof(nodestr), "local");
1930 	else
1931 		snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1932 
1933 	printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1934 	       osb->dev_str, nodestr);
1935 
1936 	ocfs2_delete_osb(osb);
1937 	kfree(osb);
1938 	sb->s_dev = 0;
1939 	sb->s_fs_info = NULL;
1940 }
1941 
ocfs2_setup_osb_uuid(struct ocfs2_super * osb,const unsigned char * uuid,unsigned uuid_bytes)1942 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1943 				unsigned uuid_bytes)
1944 {
1945 	int i, ret;
1946 	char *ptr;
1947 
1948 	BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1949 
1950 	osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1951 	if (osb->uuid_str == NULL)
1952 		return -ENOMEM;
1953 
1954 	for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1955 		/* print with null */
1956 		ret = snprintf(ptr, 3, "%02X", uuid[i]);
1957 		if (ret != 2) /* drop super cleans up */
1958 			return -EINVAL;
1959 		/* then only advance past the last char */
1960 		ptr += 2;
1961 	}
1962 
1963 	return 0;
1964 }
1965 
1966 /* Make sure entire volume is addressable by our journal.  Requires
1967    osb_clusters_at_boot to be valid and for the journal to have been
1968    initialized by ocfs2_journal_init(). */
ocfs2_journal_addressable(struct ocfs2_super * osb)1969 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
1970 {
1971 	int status = 0;
1972 	u64 max_block =
1973 		ocfs2_clusters_to_blocks(osb->sb,
1974 					 osb->osb_clusters_at_boot) - 1;
1975 
1976 	/* 32-bit block number is always OK. */
1977 	if (max_block <= (u32)~0ULL)
1978 		goto out;
1979 
1980 	/* Volume is "huge", so see if our journal is new enough to
1981 	   support it. */
1982 	if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
1983 				       OCFS2_FEATURE_COMPAT_JBD2_SB) &&
1984 	      jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
1985 					       JBD2_FEATURE_INCOMPAT_64BIT))) {
1986 		mlog(ML_ERROR, "The journal cannot address the entire volume. "
1987 		     "Enable the 'block64' journal option with tunefs.ocfs2");
1988 		status = -EFBIG;
1989 		goto out;
1990 	}
1991 
1992  out:
1993 	return status;
1994 }
1995 
ocfs2_initialize_super(struct super_block * sb,struct buffer_head * bh,int sector_size,struct ocfs2_blockcheck_stats * stats)1996 static int ocfs2_initialize_super(struct super_block *sb,
1997 				  struct buffer_head *bh,
1998 				  int sector_size,
1999 				  struct ocfs2_blockcheck_stats *stats)
2000 {
2001 	int status;
2002 	int i, cbits, bbits;
2003 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2004 	struct inode *inode = NULL;
2005 	struct ocfs2_super *osb;
2006 	u64 total_blocks;
2007 
2008 	osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2009 	if (!osb) {
2010 		status = -ENOMEM;
2011 		mlog_errno(status);
2012 		goto out;
2013 	}
2014 
2015 	sb->s_fs_info = osb;
2016 	sb->s_op = &ocfs2_sops;
2017 	sb->s_d_op = &ocfs2_dentry_ops;
2018 	sb->s_export_op = &ocfs2_export_ops;
2019 	sb->s_qcop = &dquot_quotactl_sysfile_ops;
2020 	sb->dq_op = &ocfs2_quota_operations;
2021 	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2022 	sb->s_xattr = ocfs2_xattr_handlers;
2023 	sb->s_time_gran = 1;
2024 	sb->s_flags |= SB_NOATIME;
2025 	/* this is needed to support O_LARGEFILE */
2026 	cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2027 	bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2028 	sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2029 	memcpy(&sb->s_uuid, di->id2.i_super.s_uuid,
2030 	       sizeof(di->id2.i_super.s_uuid));
2031 
2032 	osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2033 
2034 	for (i = 0; i < 3; i++)
2035 		osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2036 	osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2037 
2038 	osb->sb = sb;
2039 	osb->s_sectsize_bits = blksize_bits(sector_size);
2040 	BUG_ON(!osb->s_sectsize_bits);
2041 
2042 	spin_lock_init(&osb->dc_task_lock);
2043 	init_waitqueue_head(&osb->dc_event);
2044 	osb->dc_work_sequence = 0;
2045 	osb->dc_wake_sequence = 0;
2046 	INIT_LIST_HEAD(&osb->blocked_lock_list);
2047 	osb->blocked_lock_count = 0;
2048 	spin_lock_init(&osb->osb_lock);
2049 	spin_lock_init(&osb->osb_xattr_lock);
2050 	ocfs2_init_steal_slots(osb);
2051 
2052 	mutex_init(&osb->system_file_mutex);
2053 
2054 	atomic_set(&osb->alloc_stats.moves, 0);
2055 	atomic_set(&osb->alloc_stats.local_data, 0);
2056 	atomic_set(&osb->alloc_stats.bitmap_data, 0);
2057 	atomic_set(&osb->alloc_stats.bg_allocs, 0);
2058 	atomic_set(&osb->alloc_stats.bg_extends, 0);
2059 
2060 	/* Copy the blockcheck stats from the superblock probe */
2061 	osb->osb_ecc_stats = *stats;
2062 
2063 	ocfs2_init_node_maps(osb);
2064 
2065 	snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2066 		 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2067 
2068 	osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2069 	if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2070 		mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2071 		     osb->max_slots);
2072 		status = -EINVAL;
2073 		goto out;
2074 	}
2075 
2076 	ocfs2_orphan_scan_init(osb);
2077 
2078 	status = ocfs2_recovery_init(osb);
2079 	if (status) {
2080 		mlog(ML_ERROR, "Unable to initialize recovery state\n");
2081 		mlog_errno(status);
2082 		goto out;
2083 	}
2084 
2085 	init_waitqueue_head(&osb->checkpoint_event);
2086 
2087 	osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2088 
2089 	osb->slot_num = OCFS2_INVALID_SLOT;
2090 
2091 	osb->s_xattr_inline_size = le16_to_cpu(
2092 					di->id2.i_super.s_xattr_inline_size);
2093 
2094 	osb->local_alloc_state = OCFS2_LA_UNUSED;
2095 	osb->local_alloc_bh = NULL;
2096 	INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2097 
2098 	init_waitqueue_head(&osb->osb_mount_event);
2099 
2100 	ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2101 
2102 	osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2103 	if (!osb->vol_label) {
2104 		mlog(ML_ERROR, "unable to alloc vol label\n");
2105 		status = -ENOMEM;
2106 		goto out_recovery_map;
2107 	}
2108 
2109 	osb->slot_recovery_generations =
2110 		kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2111 			GFP_KERNEL);
2112 	if (!osb->slot_recovery_generations) {
2113 		status = -ENOMEM;
2114 		mlog_errno(status);
2115 		goto out_vol_label;
2116 	}
2117 
2118 	init_waitqueue_head(&osb->osb_wipe_event);
2119 	osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2120 					sizeof(*osb->osb_orphan_wipes),
2121 					GFP_KERNEL);
2122 	if (!osb->osb_orphan_wipes) {
2123 		status = -ENOMEM;
2124 		mlog_errno(status);
2125 		goto out_slot_recovery_gen;
2126 	}
2127 
2128 	osb->osb_rf_lock_tree = RB_ROOT;
2129 
2130 	osb->s_feature_compat =
2131 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2132 	osb->s_feature_ro_compat =
2133 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2134 	osb->s_feature_incompat =
2135 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2136 
2137 	if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2138 		mlog(ML_ERROR, "couldn't mount because of unsupported "
2139 		     "optional features (%x).\n", i);
2140 		status = -EINVAL;
2141 		goto out_orphan_wipes;
2142 	}
2143 	if (!sb_rdonly(osb->sb) && (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2144 		mlog(ML_ERROR, "couldn't mount RDWR because of "
2145 		     "unsupported optional features (%x).\n", i);
2146 		status = -EINVAL;
2147 		goto out_orphan_wipes;
2148 	}
2149 
2150 	if (ocfs2_clusterinfo_valid(osb)) {
2151 		/*
2152 		 * ci_stack and ci_cluster in ocfs2_cluster_info may not be null
2153 		 * terminated, so make sure no overflow happens here by using
2154 		 * memcpy. Destination strings will always be null terminated
2155 		 * because osb is allocated using kzalloc.
2156 		 */
2157 		osb->osb_stackflags =
2158 			OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2159 		memcpy(osb->osb_cluster_stack,
2160 		       OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2161 		       OCFS2_STACK_LABEL_LEN);
2162 		if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2163 			mlog(ML_ERROR,
2164 			     "couldn't mount because of an invalid "
2165 			     "cluster stack label (%s) \n",
2166 			     osb->osb_cluster_stack);
2167 			status = -EINVAL;
2168 			goto out_orphan_wipes;
2169 		}
2170 		memcpy(osb->osb_cluster_name,
2171 			OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
2172 			OCFS2_CLUSTER_NAME_LEN);
2173 	} else {
2174 		/* The empty string is identical with classic tools that
2175 		 * don't know about s_cluster_info. */
2176 		osb->osb_cluster_stack[0] = '\0';
2177 	}
2178 
2179 	get_random_bytes(&osb->s_next_generation, sizeof(u32));
2180 
2181 	/*
2182 	 * FIXME
2183 	 * This should be done in ocfs2_journal_init(), but any inode
2184 	 * writes back operation will cause the filesystem to crash.
2185 	 */
2186 	status = ocfs2_journal_alloc(osb);
2187 	if (status < 0)
2188 		goto out_orphan_wipes;
2189 
2190 	INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
2191 	init_llist_head(&osb->dquot_drop_list);
2192 
2193 	/* get some pseudo constants for clustersize bits */
2194 	osb->s_clustersize_bits =
2195 		le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2196 	osb->s_clustersize = 1 << osb->s_clustersize_bits;
2197 
2198 	if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2199 	    osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2200 		mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2201 		     osb->s_clustersize);
2202 		status = -EINVAL;
2203 		goto out_journal;
2204 	}
2205 
2206 	total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2207 						le32_to_cpu(di->i_clusters));
2208 
2209 	status = generic_check_addressable(osb->sb->s_blocksize_bits,
2210 					   total_blocks);
2211 	if (status) {
2212 		mlog(ML_ERROR, "Volume too large "
2213 		     "to mount safely on this system");
2214 		status = -EFBIG;
2215 		goto out_journal;
2216 	}
2217 
2218 	if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2219 				 sizeof(di->id2.i_super.s_uuid))) {
2220 		mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2221 		status = -ENOMEM;
2222 		goto out_journal;
2223 	}
2224 
2225 	strscpy(osb->vol_label, di->id2.i_super.s_label,
2226 		OCFS2_MAX_VOL_LABEL_LEN);
2227 	osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2228 	osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2229 	osb->first_cluster_group_blkno =
2230 		le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2231 	osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2232 	osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2233 	trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2234 				     (unsigned long long)osb->root_blkno,
2235 				     (unsigned long long)osb->system_dir_blkno,
2236 				     osb->s_clustersize_bits);
2237 
2238 	osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2239 	if (!osb->osb_dlm_debug) {
2240 		status = -ENOMEM;
2241 		mlog_errno(status);
2242 		goto out_uuid_str;
2243 	}
2244 
2245 	atomic_set(&osb->vol_state, VOLUME_INIT);
2246 
2247 	/* load root, system_dir, and all global system inodes */
2248 	status = ocfs2_init_global_system_inodes(osb);
2249 	if (status < 0) {
2250 		mlog_errno(status);
2251 		goto out_dlm_out;
2252 	}
2253 
2254 	/*
2255 	 * global bitmap
2256 	 */
2257 	inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2258 					    OCFS2_INVALID_SLOT);
2259 	if (!inode) {
2260 		status = -EINVAL;
2261 		mlog_errno(status);
2262 		goto out_system_inodes;
2263 	}
2264 
2265 	osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2266 	osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2267 	iput(inode);
2268 
2269 	osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2270 				 osb->s_feature_incompat) * 8;
2271 
2272 	status = ocfs2_init_slot_info(osb);
2273 	if (status < 0) {
2274 		mlog_errno(status);
2275 		goto out_system_inodes;
2276 	}
2277 
2278 	osb->ocfs2_wq = alloc_ordered_workqueue("ocfs2_wq", WQ_MEM_RECLAIM);
2279 	if (!osb->ocfs2_wq) {
2280 		status = -ENOMEM;
2281 		mlog_errno(status);
2282 		goto out_slot_info;
2283 	}
2284 
2285 	return status;
2286 
2287 out_slot_info:
2288 	ocfs2_free_slot_info(osb);
2289 out_system_inodes:
2290 	ocfs2_release_system_inodes(osb);
2291 out_dlm_out:
2292 	ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2293 out_uuid_str:
2294 	kfree(osb->uuid_str);
2295 out_journal:
2296 	kfree(osb->journal);
2297 out_orphan_wipes:
2298 	kfree(osb->osb_orphan_wipes);
2299 out_slot_recovery_gen:
2300 	kfree(osb->slot_recovery_generations);
2301 out_vol_label:
2302 	kfree(osb->vol_label);
2303 out_recovery_map:
2304 	kfree(osb->recovery_map);
2305 out:
2306 	kfree(osb);
2307 	sb->s_fs_info = NULL;
2308 	return status;
2309 }
2310 
2311 /*
2312  * will return: -EAGAIN if it is ok to keep searching for superblocks
2313  *              -EINVAL if there is a bad superblock
2314  *              0 on success
2315  */
ocfs2_verify_volume(struct ocfs2_dinode * di,struct buffer_head * bh,u32 blksz,struct ocfs2_blockcheck_stats * stats)2316 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2317 			       struct buffer_head *bh,
2318 			       u32 blksz,
2319 			       struct ocfs2_blockcheck_stats *stats)
2320 {
2321 	int status = -EAGAIN;
2322 
2323 	if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2324 		   strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2325 		/* We have to do a raw check of the feature here */
2326 		if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2327 		    OCFS2_FEATURE_INCOMPAT_META_ECC) {
2328 			status = ocfs2_block_check_validate(bh->b_data,
2329 							    bh->b_size,
2330 							    &di->i_check,
2331 							    stats);
2332 			if (status)
2333 				goto out;
2334 		}
2335 		status = -EINVAL;
2336 		if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2337 			mlog(ML_ERROR, "found superblock with incorrect block "
2338 			     "size: found %u, should be %u\n",
2339 			     1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2340 			       blksz);
2341 		} else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2342 			   OCFS2_MAJOR_REV_LEVEL ||
2343 			   le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2344 			   OCFS2_MINOR_REV_LEVEL) {
2345 			mlog(ML_ERROR, "found superblock with bad version: "
2346 			     "found %u.%u, should be %u.%u\n",
2347 			     le16_to_cpu(di->id2.i_super.s_major_rev_level),
2348 			     le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2349 			     OCFS2_MAJOR_REV_LEVEL,
2350 			     OCFS2_MINOR_REV_LEVEL);
2351 		} else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2352 			mlog(ML_ERROR, "bad block number on superblock: "
2353 			     "found %llu, should be %llu\n",
2354 			     (unsigned long long)le64_to_cpu(di->i_blkno),
2355 			     (unsigned long long)bh->b_blocknr);
2356 		} else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2357 			    le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2358 			mlog(ML_ERROR, "bad cluster size found: %u\n",
2359 			     1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2360 		} else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2361 			mlog(ML_ERROR, "bad root_blkno: 0\n");
2362 		} else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2363 			mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2364 		} else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2365 			mlog(ML_ERROR,
2366 			     "Superblock slots found greater than file system "
2367 			     "maximum: found %u, max %u\n",
2368 			     le16_to_cpu(di->id2.i_super.s_max_slots),
2369 			     OCFS2_MAX_SLOTS);
2370 		} else {
2371 			/* found it! */
2372 			status = 0;
2373 		}
2374 	}
2375 
2376 out:
2377 	if (status && status != -EAGAIN)
2378 		mlog_errno(status);
2379 	return status;
2380 }
2381 
ocfs2_check_volume(struct ocfs2_super * osb)2382 static int ocfs2_check_volume(struct ocfs2_super *osb)
2383 {
2384 	int status;
2385 	int dirty;
2386 	int local;
2387 	struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2388 						  * recover
2389 						  * ourselves. */
2390 
2391 	/* Init our journal object. */
2392 	status = ocfs2_journal_init(osb, &dirty);
2393 	if (status < 0) {
2394 		mlog(ML_ERROR, "Could not initialize journal!\n");
2395 		goto finally;
2396 	}
2397 
2398 	/* Now that journal has been initialized, check to make sure
2399 	   entire volume is addressable. */
2400 	status = ocfs2_journal_addressable(osb);
2401 	if (status)
2402 		goto finally;
2403 
2404 	/* If the journal was unmounted cleanly then we don't want to
2405 	 * recover anything. Otherwise, journal_load will do that
2406 	 * dirty work for us :) */
2407 	if (!dirty) {
2408 		status = ocfs2_journal_wipe(osb->journal, 0);
2409 		if (status < 0) {
2410 			mlog_errno(status);
2411 			goto finally;
2412 		}
2413 	} else {
2414 		printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2415 		       "unmounted cleanly, recovering it.\n", osb->dev_str);
2416 	}
2417 
2418 	local = ocfs2_mount_local(osb);
2419 
2420 	/* will play back anything left in the journal. */
2421 	status = ocfs2_journal_load(osb->journal, local, dirty);
2422 	if (status < 0) {
2423 		mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2424 		goto finally;
2425 	}
2426 
2427 	if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
2428 		jbd2_journal_set_features(osb->journal->j_journal,
2429 				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2430 				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2431 	else
2432 		jbd2_journal_clear_features(osb->journal->j_journal,
2433 				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2434 				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2435 
2436 	if (dirty) {
2437 		/* recover my local alloc if we didn't unmount cleanly. */
2438 		status = ocfs2_begin_local_alloc_recovery(osb,
2439 							  osb->slot_num,
2440 							  &local_alloc);
2441 		if (status < 0) {
2442 			mlog_errno(status);
2443 			goto finally;
2444 		}
2445 		/* we complete the recovery process after we've marked
2446 		 * ourselves as mounted. */
2447 	}
2448 
2449 	status = ocfs2_load_local_alloc(osb);
2450 	if (status < 0) {
2451 		mlog_errno(status);
2452 		goto finally;
2453 	}
2454 
2455 	if (dirty) {
2456 		/* Recovery will be completed after we've mounted the
2457 		 * rest of the volume. */
2458 		osb->local_alloc_copy = local_alloc;
2459 		local_alloc = NULL;
2460 	}
2461 
2462 	/* go through each journal, trylock it and if you get the
2463 	 * lock, and it's marked as dirty, set the bit in the recover
2464 	 * map and launch a recovery thread for it. */
2465 	status = ocfs2_mark_dead_nodes(osb);
2466 	if (status < 0) {
2467 		mlog_errno(status);
2468 		goto finally;
2469 	}
2470 
2471 	status = ocfs2_compute_replay_slots(osb);
2472 	if (status < 0)
2473 		mlog_errno(status);
2474 
2475 finally:
2476 	kfree(local_alloc);
2477 
2478 	if (status)
2479 		mlog_errno(status);
2480 	return status;
2481 }
2482 
2483 /*
2484  * The routine gets called from dismount or close whenever a dismount on
2485  * volume is requested and the osb open count becomes 1.
2486  * It will remove the osb from the global list and also free up all the
2487  * initialized resources and fileobject.
2488  */
ocfs2_delete_osb(struct ocfs2_super * osb)2489 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2490 {
2491 	/* This function assumes that the caller has the main osb resource */
2492 
2493 	/* ocfs2_initializer_super have already created this workqueue */
2494 	if (osb->ocfs2_wq)
2495 		destroy_workqueue(osb->ocfs2_wq);
2496 
2497 	ocfs2_free_slot_info(osb);
2498 
2499 	kfree(osb->osb_orphan_wipes);
2500 	kfree(osb->slot_recovery_generations);
2501 	/* FIXME
2502 	 * This belongs in journal shutdown, but because we have to
2503 	 * allocate osb->journal at the middle of ocfs2_initialize_super(),
2504 	 * we free it here.
2505 	 */
2506 	kfree(osb->journal);
2507 	kfree(osb->local_alloc_copy);
2508 	kfree(osb->uuid_str);
2509 	kfree(osb->vol_label);
2510 	ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2511 	memset(osb, 0, sizeof(struct ocfs2_super));
2512 }
2513 
2514 /* Depending on the mount option passed, perform one of the following:
2515  * Put OCFS2 into a readonly state (default)
2516  * Return EIO so that only the process errs
2517  * Fix the error as if fsck.ocfs2 -y
2518  * panic
2519  */
ocfs2_handle_error(struct super_block * sb)2520 static int ocfs2_handle_error(struct super_block *sb)
2521 {
2522 	struct ocfs2_super *osb = OCFS2_SB(sb);
2523 	int rv = 0;
2524 
2525 	ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2526 	pr_crit("On-disk corruption discovered. "
2527 		"Please run fsck.ocfs2 once the filesystem is unmounted.\n");
2528 
2529 	if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
2530 		panic("OCFS2: (device %s): panic forced after error\n",
2531 		      sb->s_id);
2532 	} else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
2533 		pr_crit("OCFS2: Returning error to the calling process.\n");
2534 		rv = -EIO;
2535 	} else { /* default option */
2536 		rv = -EROFS;
2537 		if (sb_rdonly(sb) && (ocfs2_is_soft_readonly(osb) || ocfs2_is_hard_readonly(osb)))
2538 			return rv;
2539 
2540 		pr_crit("OCFS2: File system is now read-only.\n");
2541 		sb->s_flags |= SB_RDONLY;
2542 		ocfs2_set_ro_flag(osb, 0);
2543 	}
2544 
2545 	return rv;
2546 }
2547 
__ocfs2_error(struct super_block * sb,const char * function,const char * fmt,...)2548 int __ocfs2_error(struct super_block *sb, const char *function,
2549 		  const char *fmt, ...)
2550 {
2551 	struct va_format vaf;
2552 	va_list args;
2553 
2554 	va_start(args, fmt);
2555 	vaf.fmt = fmt;
2556 	vaf.va = &args;
2557 
2558 	/* Not using mlog here because we want to show the actual
2559 	 * function the error came from. */
2560 	printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %pV",
2561 	       sb->s_id, function, &vaf);
2562 
2563 	va_end(args);
2564 
2565 	return ocfs2_handle_error(sb);
2566 }
2567 
2568 /* Handle critical errors. This is intentionally more drastic than
2569  * ocfs2_handle_error, so we only use for things like journal errors,
2570  * etc. */
__ocfs2_abort(struct super_block * sb,const char * function,const char * fmt,...)2571 void __ocfs2_abort(struct super_block *sb, const char *function,
2572 		   const char *fmt, ...)
2573 {
2574 	struct va_format vaf;
2575 	va_list args;
2576 
2577 	va_start(args, fmt);
2578 
2579 	vaf.fmt = fmt;
2580 	vaf.va = &args;
2581 
2582 	printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
2583 	       sb->s_id, function, &vaf);
2584 
2585 	va_end(args);
2586 
2587 	/* We don't have the cluster support yet to go straight to
2588 	 * hard readonly in here. Until then, we want to keep
2589 	 * ocfs2_abort() so that we can at least mark critical
2590 	 * errors.
2591 	 *
2592 	 * TODO: This should abort the journal and alert other nodes
2593 	 * that our slot needs recovery. */
2594 
2595 	/* Force a panic(). This stinks, but it's better than letting
2596 	 * things continue without having a proper hard readonly
2597 	 * here. */
2598 	if (!ocfs2_mount_local(OCFS2_SB(sb)))
2599 		OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2600 	ocfs2_handle_error(sb);
2601 }
2602 
2603 /*
2604  * Void signal blockers, because in-kernel sigprocmask() only fails
2605  * when SIG_* is wrong.
2606  */
ocfs2_block_signals(sigset_t * oldset)2607 void ocfs2_block_signals(sigset_t *oldset)
2608 {
2609 	int rc;
2610 	sigset_t blocked;
2611 
2612 	sigfillset(&blocked);
2613 	rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2614 	BUG_ON(rc);
2615 }
2616 
ocfs2_unblock_signals(sigset_t * oldset)2617 void ocfs2_unblock_signals(sigset_t *oldset)
2618 {
2619 	int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2620 	BUG_ON(rc);
2621 }
2622 
2623 module_init(ocfs2_init);
2624 module_exit(ocfs2_exit);
2625