Btrfs: fix space leak when we fail to reserve metadata space
[linux-2.6.git] / fs / ocfs2 / super.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * super.c
5  *
6  * load/unload driver, mount/dismount volumes
7  *
8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public
12  * License as published by the Free Software Foundation; either
13  * version 2 of the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public
21  * License along with this program; if not, write to the
22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23  * Boston, MA 021110-1307, USA.
24  */
25
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/init.h>
32 #include <linux/random.h>
33 #include <linux/statfs.h>
34 #include <linux/moduleparam.h>
35 #include <linux/blkdev.h>
36 #include <linux/socket.h>
37 #include <linux/inet.h>
38 #include <linux/parser.h>
39 #include <linux/crc32.h>
40 #include <linux/debugfs.h>
41 #include <linux/mount.h>
42 #include <linux/seq_file.h>
43 #include <linux/quotaops.h>
44 #include <linux/cleancache.h>
45
46 #define CREATE_TRACE_POINTS
47 #include "ocfs2_trace.h"
48
49 #include <cluster/masklog.h>
50
51 #include "ocfs2.h"
52
53 /* this should be the only file to include a version 1 header */
54 #include "ocfs1_fs_compat.h"
55
56 #include "alloc.h"
57 #include "aops.h"
58 #include "blockcheck.h"
59 #include "dlmglue.h"
60 #include "export.h"
61 #include "extent_map.h"
62 #include "heartbeat.h"
63 #include "inode.h"
64 #include "journal.h"
65 #include "localalloc.h"
66 #include "namei.h"
67 #include "slot_map.h"
68 #include "super.h"
69 #include "sysfile.h"
70 #include "uptodate.h"
71 #include "ver.h"
72 #include "xattr.h"
73 #include "quota.h"
74 #include "refcounttree.h"
75 #include "suballoc.h"
76
77 #include "buffer_head_io.h"
78
79 static struct kmem_cache *ocfs2_inode_cachep = NULL;
80 struct kmem_cache *ocfs2_dquot_cachep;
81 struct kmem_cache *ocfs2_qf_chunk_cachep;
82
83 /* OCFS2 needs to schedule several different types of work which
84  * require cluster locking, disk I/O, recovery waits, etc. Since these
85  * types of work tend to be heavy we avoid using the kernel events
86  * workqueue and schedule on our own. */
87 struct workqueue_struct *ocfs2_wq = NULL;
88
89 static struct dentry *ocfs2_debugfs_root = NULL;
90
91 MODULE_AUTHOR("Oracle");
92 MODULE_LICENSE("GPL");
93
94 struct mount_options
95 {
96         unsigned long   commit_interval;
97         unsigned long   mount_opt;
98         unsigned int    atime_quantum;
99         signed short    slot;
100         int             localalloc_opt;
101         unsigned int    resv_level;
102         int             dir_resv_level;
103         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
104 };
105
106 static int ocfs2_parse_options(struct super_block *sb, char *options,
107                                struct mount_options *mopt,
108                                int is_remount);
109 static int ocfs2_check_set_options(struct super_block *sb,
110                                    struct mount_options *options);
111 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
112 static void ocfs2_put_super(struct super_block *sb);
113 static int ocfs2_mount_volume(struct super_block *sb);
114 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
115 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
116 static int ocfs2_initialize_mem_caches(void);
117 static void ocfs2_free_mem_caches(void);
118 static void ocfs2_delete_osb(struct ocfs2_super *osb);
119
120 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
121
122 static int ocfs2_sync_fs(struct super_block *sb, int wait);
123
124 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
125 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
126 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
127 static int ocfs2_check_volume(struct ocfs2_super *osb);
128 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
129                                struct buffer_head *bh,
130                                u32 sectsize,
131                                struct ocfs2_blockcheck_stats *stats);
132 static int ocfs2_initialize_super(struct super_block *sb,
133                                   struct buffer_head *bh,
134                                   int sector_size,
135                                   struct ocfs2_blockcheck_stats *stats);
136 static int ocfs2_get_sector(struct super_block *sb,
137                             struct buffer_head **bh,
138                             int block,
139                             int sect_size);
140 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
141 static void ocfs2_destroy_inode(struct inode *inode);
142 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
143 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
144 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
145
146 static const struct super_operations ocfs2_sops = {
147         .statfs         = ocfs2_statfs,
148         .alloc_inode    = ocfs2_alloc_inode,
149         .destroy_inode  = ocfs2_destroy_inode,
150         .drop_inode     = ocfs2_drop_inode,
151         .evict_inode    = ocfs2_evict_inode,
152         .sync_fs        = ocfs2_sync_fs,
153         .put_super      = ocfs2_put_super,
154         .remount_fs     = ocfs2_remount,
155         .show_options   = ocfs2_show_options,
156         .quota_read     = ocfs2_quota_read,
157         .quota_write    = ocfs2_quota_write,
158 };
159
160 enum {
161         Opt_barrier,
162         Opt_err_panic,
163         Opt_err_ro,
164         Opt_intr,
165         Opt_nointr,
166         Opt_hb_none,
167         Opt_hb_local,
168         Opt_hb_global,
169         Opt_data_ordered,
170         Opt_data_writeback,
171         Opt_atime_quantum,
172         Opt_slot,
173         Opt_commit,
174         Opt_localalloc,
175         Opt_localflocks,
176         Opt_stack,
177         Opt_user_xattr,
178         Opt_nouser_xattr,
179         Opt_inode64,
180         Opt_acl,
181         Opt_noacl,
182         Opt_usrquota,
183         Opt_grpquota,
184         Opt_coherency_buffered,
185         Opt_coherency_full,
186         Opt_resv_level,
187         Opt_dir_resv_level,
188         Opt_err,
189 };
190
191 static const match_table_t tokens = {
192         {Opt_barrier, "barrier=%u"},
193         {Opt_err_panic, "errors=panic"},
194         {Opt_err_ro, "errors=remount-ro"},
195         {Opt_intr, "intr"},
196         {Opt_nointr, "nointr"},
197         {Opt_hb_none, OCFS2_HB_NONE},
198         {Opt_hb_local, OCFS2_HB_LOCAL},
199         {Opt_hb_global, OCFS2_HB_GLOBAL},
200         {Opt_data_ordered, "data=ordered"},
201         {Opt_data_writeback, "data=writeback"},
202         {Opt_atime_quantum, "atime_quantum=%u"},
203         {Opt_slot, "preferred_slot=%u"},
204         {Opt_commit, "commit=%u"},
205         {Opt_localalloc, "localalloc=%d"},
206         {Opt_localflocks, "localflocks"},
207         {Opt_stack, "cluster_stack=%s"},
208         {Opt_user_xattr, "user_xattr"},
209         {Opt_nouser_xattr, "nouser_xattr"},
210         {Opt_inode64, "inode64"},
211         {Opt_acl, "acl"},
212         {Opt_noacl, "noacl"},
213         {Opt_usrquota, "usrquota"},
214         {Opt_grpquota, "grpquota"},
215         {Opt_coherency_buffered, "coherency=buffered"},
216         {Opt_coherency_full, "coherency=full"},
217         {Opt_resv_level, "resv_level=%u"},
218         {Opt_dir_resv_level, "dir_resv_level=%u"},
219         {Opt_err, NULL}
220 };
221
222 #ifdef CONFIG_DEBUG_FS
223 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
224 {
225         struct ocfs2_cluster_connection *cconn = osb->cconn;
226         struct ocfs2_recovery_map *rm = osb->recovery_map;
227         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
228         int i, out = 0;
229
230         out += snprintf(buf + out, len - out,
231                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
232                         "Device", osb->dev_str, osb->uuid_str,
233                         osb->fs_generation, osb->vol_label);
234
235         out += snprintf(buf + out, len - out,
236                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
237                         atomic_read(&osb->vol_state), osb->osb_flags);
238
239         out += snprintf(buf + out, len - out,
240                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
241                         osb->sb->s_blocksize, osb->s_clustersize);
242
243         out += snprintf(buf + out, len - out,
244                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
245                         "ROcompat: 0x%X\n",
246                         "Features", osb->s_feature_compat,
247                         osb->s_feature_incompat, osb->s_feature_ro_compat);
248
249         out += snprintf(buf + out, len - out,
250                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
251                         osb->s_mount_opt, osb->s_atime_quantum);
252
253         if (cconn) {
254                 out += snprintf(buf + out, len - out,
255                                 "%10s => Stack: %s  Name: %*s  "
256                                 "Version: %d.%d\n", "Cluster",
257                                 (*osb->osb_cluster_stack == '\0' ?
258                                  "o2cb" : osb->osb_cluster_stack),
259                                 cconn->cc_namelen, cconn->cc_name,
260                                 cconn->cc_version.pv_major,
261                                 cconn->cc_version.pv_minor);
262         }
263
264         spin_lock(&osb->dc_task_lock);
265         out += snprintf(buf + out, len - out,
266                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
267                         "WorkSeq: %lu\n", "DownCnvt",
268                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
269                         osb->blocked_lock_count, osb->dc_wake_sequence,
270                         osb->dc_work_sequence);
271         spin_unlock(&osb->dc_task_lock);
272
273         spin_lock(&osb->osb_lock);
274         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
275                         "Recovery",
276                         (osb->recovery_thread_task ?
277                          task_pid_nr(osb->recovery_thread_task) : -1));
278         if (rm->rm_used == 0)
279                 out += snprintf(buf + out, len - out, " None\n");
280         else {
281                 for (i = 0; i < rm->rm_used; i++)
282                         out += snprintf(buf + out, len - out, " %d",
283                                         rm->rm_entries[i]);
284                 out += snprintf(buf + out, len - out, "\n");
285         }
286         spin_unlock(&osb->osb_lock);
287
288         out += snprintf(buf + out, len - out,
289                         "%10s => Pid: %d  Interval: %lu  Needs: %d\n", "Commit",
290                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
291                         osb->osb_commit_interval,
292                         atomic_read(&osb->needs_checkpoint));
293
294         out += snprintf(buf + out, len - out,
295                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
296                         "Journal", osb->journal->j_state,
297                         osb->journal->j_trans_id,
298                         atomic_read(&osb->journal->j_num_trans));
299
300         out += snprintf(buf + out, len - out,
301                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
302                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
303                         "Stats",
304                         atomic_read(&osb->alloc_stats.bitmap_data),
305                         atomic_read(&osb->alloc_stats.local_data),
306                         atomic_read(&osb->alloc_stats.bg_allocs),
307                         atomic_read(&osb->alloc_stats.moves),
308                         atomic_read(&osb->alloc_stats.bg_extends));
309
310         out += snprintf(buf + out, len - out,
311                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
312                         "Default: %u bits\n",
313                         "LocalAlloc", osb->local_alloc_state,
314                         (unsigned long long)osb->la_last_gd,
315                         osb->local_alloc_bits, osb->local_alloc_default_bits);
316
317         spin_lock(&osb->osb_lock);
318         out += snprintf(buf + out, len - out,
319                         "%10s => InodeSlot: %d  StolenInodes: %d, "
320                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
321                         osb->s_inode_steal_slot,
322                         atomic_read(&osb->s_num_inodes_stolen),
323                         osb->s_meta_steal_slot,
324                         atomic_read(&osb->s_num_meta_stolen));
325         spin_unlock(&osb->osb_lock);
326
327         out += snprintf(buf + out, len - out, "OrphanScan => ");
328         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
329                         os->os_count, os->os_seqno);
330         out += snprintf(buf + out, len - out, " Last Scan: ");
331         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
332                 out += snprintf(buf + out, len - out, "Disabled\n");
333         else
334                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
335                                 (get_seconds() - os->os_scantime.tv_sec));
336
337         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
338                         "Slots", "Num", "RecoGen");
339         for (i = 0; i < osb->max_slots; ++i) {
340                 out += snprintf(buf + out, len - out,
341                                 "%10s  %c %3d  %10d\n",
342                                 " ",
343                                 (i == osb->slot_num ? '*' : ' '),
344                                 i, osb->slot_recovery_generations[i]);
345         }
346
347         return out;
348 }
349
350 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
351 {
352         struct ocfs2_super *osb = inode->i_private;
353         char *buf = NULL;
354
355         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
356         if (!buf)
357                 goto bail;
358
359         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
360
361         file->private_data = buf;
362
363         return 0;
364 bail:
365         return -ENOMEM;
366 }
367
368 static int ocfs2_debug_release(struct inode *inode, struct file *file)
369 {
370         kfree(file->private_data);
371         return 0;
372 }
373
374 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
375                                 size_t nbytes, loff_t *ppos)
376 {
377         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
378                                        i_size_read(file->f_mapping->host));
379 }
380 #else
381 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
382 {
383         return 0;
384 }
385 static int ocfs2_debug_release(struct inode *inode, struct file *file)
386 {
387         return 0;
388 }
389 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
390                                 size_t nbytes, loff_t *ppos)
391 {
392         return 0;
393 }
394 #endif  /* CONFIG_DEBUG_FS */
395
396 static const struct file_operations ocfs2_osb_debug_fops = {
397         .open =         ocfs2_osb_debug_open,
398         .release =      ocfs2_debug_release,
399         .read =         ocfs2_debug_read,
400         .llseek =       generic_file_llseek,
401 };
402
403 static int ocfs2_sync_fs(struct super_block *sb, int wait)
404 {
405         int status;
406         tid_t target;
407         struct ocfs2_super *osb = OCFS2_SB(sb);
408
409         if (ocfs2_is_hard_readonly(osb))
410                 return -EROFS;
411
412         if (wait) {
413                 status = ocfs2_flush_truncate_log(osb);
414                 if (status < 0)
415                         mlog_errno(status);
416         } else {
417                 ocfs2_schedule_truncate_log_flush(osb, 0);
418         }
419
420         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
421                                       &target)) {
422                 if (wait)
423                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
424                                              target);
425         }
426         return 0;
427 }
428
429 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
430 {
431         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
432             && (ino == USER_QUOTA_SYSTEM_INODE
433                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
434                 return 0;
435         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
436             && (ino == GROUP_QUOTA_SYSTEM_INODE
437                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
438                 return 0;
439         return 1;
440 }
441
442 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
443 {
444         struct inode *new = NULL;
445         int status = 0;
446         int i;
447
448         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
449         if (IS_ERR(new)) {
450                 status = PTR_ERR(new);
451                 mlog_errno(status);
452                 goto bail;
453         }
454         osb->root_inode = new;
455
456         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
457         if (IS_ERR(new)) {
458                 status = PTR_ERR(new);
459                 mlog_errno(status);
460                 goto bail;
461         }
462         osb->sys_root_inode = new;
463
464         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
465              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
466                 if (!ocfs2_need_system_inode(osb, i))
467                         continue;
468                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
469                 if (!new) {
470                         ocfs2_release_system_inodes(osb);
471                         status = -EINVAL;
472                         mlog_errno(status);
473                         /* FIXME: Should ERROR_RO_FS */
474                         mlog(ML_ERROR, "Unable to load system inode %d, "
475                              "possibly corrupt fs?", i);
476                         goto bail;
477                 }
478                 // the array now has one ref, so drop this one
479                 iput(new);
480         }
481
482 bail:
483         if (status)
484                 mlog_errno(status);
485         return status;
486 }
487
488 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
489 {
490         struct inode *new = NULL;
491         int status = 0;
492         int i;
493
494         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
495              i < NUM_SYSTEM_INODES;
496              i++) {
497                 if (!ocfs2_need_system_inode(osb, i))
498                         continue;
499                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
500                 if (!new) {
501                         ocfs2_release_system_inodes(osb);
502                         status = -EINVAL;
503                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
504                              status, i, osb->slot_num);
505                         goto bail;
506                 }
507                 /* the array now has one ref, so drop this one */
508                 iput(new);
509         }
510
511 bail:
512         if (status)
513                 mlog_errno(status);
514         return status;
515 }
516
517 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
518 {
519         int i;
520         struct inode *inode;
521
522         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
523                 inode = osb->global_system_inodes[i];
524                 if (inode) {
525                         iput(inode);
526                         osb->global_system_inodes[i] = NULL;
527                 }
528         }
529
530         inode = osb->sys_root_inode;
531         if (inode) {
532                 iput(inode);
533                 osb->sys_root_inode = NULL;
534         }
535
536         inode = osb->root_inode;
537         if (inode) {
538                 iput(inode);
539                 osb->root_inode = NULL;
540         }
541
542         if (!osb->local_system_inodes)
543                 return;
544
545         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
546                 if (osb->local_system_inodes[i]) {
547                         iput(osb->local_system_inodes[i]);
548                         osb->local_system_inodes[i] = NULL;
549                 }
550         }
551
552         kfree(osb->local_system_inodes);
553         osb->local_system_inodes = NULL;
554 }
555
556 /* We're allocating fs objects, use GFP_NOFS */
557 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
558 {
559         struct ocfs2_inode_info *oi;
560
561         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
562         if (!oi)
563                 return NULL;
564
565         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
566         return &oi->vfs_inode;
567 }
568
569 static void ocfs2_i_callback(struct rcu_head *head)
570 {
571         struct inode *inode = container_of(head, struct inode, i_rcu);
572         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
573 }
574
575 static void ocfs2_destroy_inode(struct inode *inode)
576 {
577         call_rcu(&inode->i_rcu, ocfs2_i_callback);
578 }
579
580 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
581                                                 unsigned int cbits)
582 {
583         unsigned int bytes = 1 << cbits;
584         unsigned int trim = bytes;
585         unsigned int bitshift = 32;
586
587         /*
588          * i_size and all block offsets in ocfs2 are always 64 bits
589          * wide. i_clusters is 32 bits, in cluster-sized units. So on
590          * 64 bit platforms, cluster size will be the limiting factor.
591          */
592
593 #if BITS_PER_LONG == 32
594 # if defined(CONFIG_LBDAF)
595         BUILD_BUG_ON(sizeof(sector_t) != 8);
596         /*
597          * We might be limited by page cache size.
598          */
599         if (bytes > PAGE_CACHE_SIZE) {
600                 bytes = PAGE_CACHE_SIZE;
601                 trim = 1;
602                 /*
603                  * Shift by 31 here so that we don't get larger than
604                  * MAX_LFS_FILESIZE
605                  */
606                 bitshift = 31;
607         }
608 # else
609         /*
610          * We are limited by the size of sector_t. Use block size, as
611          * that's what we expose to the VFS.
612          */
613         bytes = 1 << bbits;
614         trim = 1;
615         bitshift = 31;
616 # endif
617 #endif
618
619         /*
620          * Trim by a whole cluster when we can actually approach the
621          * on-disk limits. Otherwise we can overflow i_clusters when
622          * an extent start is at the max offset.
623          */
624         return (((unsigned long long)bytes) << bitshift) - trim;
625 }
626
627 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
628 {
629         int incompat_features;
630         int ret = 0;
631         struct mount_options parsed_options;
632         struct ocfs2_super *osb = OCFS2_SB(sb);
633         u32 tmp;
634
635         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
636             !ocfs2_check_set_options(sb, &parsed_options)) {
637                 ret = -EINVAL;
638                 goto out;
639         }
640
641         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
642                 OCFS2_MOUNT_HB_NONE;
643         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
644                 ret = -EINVAL;
645                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
646                 goto out;
647         }
648
649         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
650             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
651                 ret = -EINVAL;
652                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
653                 goto out;
654         }
655
656         /* Probably don't want this on remount; it might
657          * mess with other nodes */
658         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
659             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
660                 ret = -EINVAL;
661                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
662                 goto out;
663         }
664
665         /* We're going to/from readonly mode. */
666         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
667                 /* Disable quota accounting before remounting RO */
668                 if (*flags & MS_RDONLY) {
669                         ret = ocfs2_susp_quotas(osb, 0);
670                         if (ret < 0)
671                                 goto out;
672                 }
673                 /* Lock here so the check of HARD_RO and the potential
674                  * setting of SOFT_RO is atomic. */
675                 spin_lock(&osb->osb_lock);
676                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
677                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
678                         ret = -EROFS;
679                         goto unlock_osb;
680                 }
681
682                 if (*flags & MS_RDONLY) {
683                         sb->s_flags |= MS_RDONLY;
684                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
685                 } else {
686                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
687                                 mlog(ML_ERROR, "Cannot remount RDWR "
688                                      "filesystem due to previous errors.\n");
689                                 ret = -EROFS;
690                                 goto unlock_osb;
691                         }
692                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
693                         if (incompat_features) {
694                                 mlog(ML_ERROR, "Cannot remount RDWR because "
695                                      "of unsupported optional features "
696                                      "(%x).\n", incompat_features);
697                                 ret = -EINVAL;
698                                 goto unlock_osb;
699                         }
700                         sb->s_flags &= ~MS_RDONLY;
701                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
702                 }
703                 trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
704 unlock_osb:
705                 spin_unlock(&osb->osb_lock);
706                 /* Enable quota accounting after remounting RW */
707                 if (!ret && !(*flags & MS_RDONLY)) {
708                         if (sb_any_quota_suspended(sb))
709                                 ret = ocfs2_susp_quotas(osb, 1);
710                         else
711                                 ret = ocfs2_enable_quotas(osb);
712                         if (ret < 0) {
713                                 /* Return back changes... */
714                                 spin_lock(&osb->osb_lock);
715                                 sb->s_flags |= MS_RDONLY;
716                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
717                                 spin_unlock(&osb->osb_lock);
718                                 goto out;
719                         }
720                 }
721         }
722
723         if (!ret) {
724                 /* Only save off the new mount options in case of a successful
725                  * remount. */
726                 osb->s_mount_opt = parsed_options.mount_opt;
727                 osb->s_atime_quantum = parsed_options.atime_quantum;
728                 osb->preferred_slot = parsed_options.slot;
729                 if (parsed_options.commit_interval)
730                         osb->osb_commit_interval = parsed_options.commit_interval;
731
732                 if (!ocfs2_is_hard_readonly(osb))
733                         ocfs2_set_journal_params(osb);
734
735                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
736                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
737                                                         MS_POSIXACL : 0);
738         }
739 out:
740         return ret;
741 }
742
743 static int ocfs2_sb_probe(struct super_block *sb,
744                           struct buffer_head **bh,
745                           int *sector_size,
746                           struct ocfs2_blockcheck_stats *stats)
747 {
748         int status, tmpstat;
749         struct ocfs1_vol_disk_hdr *hdr;
750         struct ocfs2_dinode *di;
751         int blksize;
752
753         *bh = NULL;
754
755         /* may be > 512 */
756         *sector_size = bdev_logical_block_size(sb->s_bdev);
757         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
758                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
759                      *sector_size, OCFS2_MAX_BLOCKSIZE);
760                 status = -EINVAL;
761                 goto bail;
762         }
763
764         /* Can this really happen? */
765         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
766                 *sector_size = OCFS2_MIN_BLOCKSIZE;
767
768         /* check block zero for old format */
769         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
770         if (status < 0) {
771                 mlog_errno(status);
772                 goto bail;
773         }
774         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
775         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
776                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
777                      hdr->major_version, hdr->minor_version);
778                 status = -EINVAL;
779         }
780         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
781                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
782                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
783                      hdr->signature);
784                 status = -EINVAL;
785         }
786         brelse(*bh);
787         *bh = NULL;
788         if (status < 0) {
789                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
790                      "upgraded before mounting with ocfs v2\n");
791                 goto bail;
792         }
793
794         /*
795          * Now check at magic offset for 512, 1024, 2048, 4096
796          * blocksizes.  4096 is the maximum blocksize because it is
797          * the minimum clustersize.
798          */
799         status = -EINVAL;
800         for (blksize = *sector_size;
801              blksize <= OCFS2_MAX_BLOCKSIZE;
802              blksize <<= 1) {
803                 tmpstat = ocfs2_get_sector(sb, bh,
804                                            OCFS2_SUPER_BLOCK_BLKNO,
805                                            blksize);
806                 if (tmpstat < 0) {
807                         status = tmpstat;
808                         mlog_errno(status);
809                         break;
810                 }
811                 di = (struct ocfs2_dinode *) (*bh)->b_data;
812                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
813                 spin_lock_init(&stats->b_lock);
814                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
815                 if (tmpstat < 0) {
816                         brelse(*bh);
817                         *bh = NULL;
818                 }
819                 if (tmpstat != -EAGAIN) {
820                         status = tmpstat;
821                         break;
822                 }
823         }
824
825 bail:
826         return status;
827 }
828
829 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
830 {
831         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
832
833         if (osb->s_mount_opt & hb_enabled) {
834                 if (ocfs2_mount_local(osb)) {
835                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
836                              "mounted device.\n");
837                         return -EINVAL;
838                 }
839                 if (ocfs2_userspace_stack(osb)) {
840                         mlog(ML_ERROR, "Userspace stack expected, but "
841                              "o2cb heartbeat arguments passed to mount\n");
842                         return -EINVAL;
843                 }
844                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
845                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
846                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
847                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
848                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
849                         return -EINVAL;
850                 }
851         }
852
853         if (!(osb->s_mount_opt & hb_enabled)) {
854                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
855                     !ocfs2_userspace_stack(osb)) {
856                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
857                              "a read-write clustered device.\n");
858                         return -EINVAL;
859                 }
860         }
861
862         return 0;
863 }
864
865 /*
866  * If we're using a userspace stack, mount should have passed
867  * a name that matches the disk.  If not, mount should not
868  * have passed a stack.
869  */
870 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
871                                         struct mount_options *mopt)
872 {
873         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
874                 mlog(ML_ERROR,
875                      "cluster stack passed to mount, but this filesystem "
876                      "does not support it\n");
877                 return -EINVAL;
878         }
879
880         if (ocfs2_userspace_stack(osb) &&
881             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
882                     OCFS2_STACK_LABEL_LEN)) {
883                 mlog(ML_ERROR,
884                      "cluster stack passed to mount (\"%s\") does not "
885                      "match the filesystem (\"%s\")\n",
886                      mopt->cluster_stack,
887                      osb->osb_cluster_stack);
888                 return -EINVAL;
889         }
890
891         return 0;
892 }
893
894 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
895 {
896         int type;
897         struct super_block *sb = osb->sb;
898         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
899                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
900         int status = 0;
901
902         for (type = 0; type < MAXQUOTAS; type++) {
903                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
904                         continue;
905                 if (unsuspend)
906                         status = dquot_resume(sb, type);
907                 else {
908                         struct ocfs2_mem_dqinfo *oinfo;
909
910                         /* Cancel periodic syncing before suspending */
911                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
912                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
913                         status = dquot_suspend(sb, type);
914                 }
915                 if (status < 0)
916                         break;
917         }
918         if (status < 0)
919                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
920                      "remount (error = %d).\n", status);
921         return status;
922 }
923
924 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
925 {
926         struct inode *inode[MAXQUOTAS] = { NULL, NULL };
927         struct super_block *sb = osb->sb;
928         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
929                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
930         unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
931                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
932         int status;
933         int type;
934
935         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
936         for (type = 0; type < MAXQUOTAS; type++) {
937                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
938                         continue;
939                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
940                                                         osb->slot_num);
941                 if (!inode[type]) {
942                         status = -ENOENT;
943                         goto out_quota_off;
944                 }
945                 status = dquot_enable(inode[type], type, QFMT_OCFS2,
946                                       DQUOT_USAGE_ENABLED);
947                 if (status < 0)
948                         goto out_quota_off;
949         }
950
951         for (type = 0; type < MAXQUOTAS; type++)
952                 iput(inode[type]);
953         return 0;
954 out_quota_off:
955         ocfs2_disable_quotas(osb);
956         for (type = 0; type < MAXQUOTAS; type++)
957                 iput(inode[type]);
958         mlog_errno(status);
959         return status;
960 }
961
962 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
963 {
964         int type;
965         struct inode *inode;
966         struct super_block *sb = osb->sb;
967         struct ocfs2_mem_dqinfo *oinfo;
968
969         /* We mostly ignore errors in this function because there's not much
970          * we can do when we see them */
971         for (type = 0; type < MAXQUOTAS; type++) {
972                 if (!sb_has_quota_loaded(sb, type))
973                         continue;
974                 /* Cancel periodic syncing before we grab dqonoff_mutex */
975                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
976                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
977                 inode = igrab(sb->s_dquot.files[type]);
978                 /* Turn off quotas. This will remove all dquot structures from
979                  * memory and so they will be automatically synced to global
980                  * quota files */
981                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
982                                         DQUOT_LIMITS_ENABLED);
983                 if (!inode)
984                         continue;
985                 iput(inode);
986         }
987 }
988
989 /* Handle quota on quotactl */
990 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
991 {
992         unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
993                                              OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
994
995         if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
996                 return -EINVAL;
997
998         return dquot_enable(sb_dqopt(sb)->files[type], type,
999                             format_id, DQUOT_LIMITS_ENABLED);
1000 }
1001
1002 /* Handle quota off quotactl */
1003 static int ocfs2_quota_off(struct super_block *sb, int type)
1004 {
1005         return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1006 }
1007
1008 static const struct quotactl_ops ocfs2_quotactl_ops = {
1009         .quota_on_meta  = ocfs2_quota_on,
1010         .quota_off      = ocfs2_quota_off,
1011         .quota_sync     = dquot_quota_sync,
1012         .get_info       = dquot_get_dqinfo,
1013         .set_info       = dquot_set_dqinfo,
1014         .get_dqblk      = dquot_get_dqblk,
1015         .set_dqblk      = dquot_set_dqblk,
1016 };
1017
1018 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1019 {
1020         struct dentry *root;
1021         int status, sector_size;
1022         struct mount_options parsed_options;
1023         struct inode *inode = NULL;
1024         struct ocfs2_super *osb = NULL;
1025         struct buffer_head *bh = NULL;
1026         char nodestr[8];
1027         struct ocfs2_blockcheck_stats stats;
1028
1029         trace_ocfs2_fill_super(sb, data, silent);
1030
1031         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1032                 status = -EINVAL;
1033                 goto read_super_error;
1034         }
1035
1036         /* probe for superblock */
1037         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1038         if (status < 0) {
1039                 mlog(ML_ERROR, "superblock probe failed!\n");
1040                 goto read_super_error;
1041         }
1042
1043         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1044         osb = OCFS2_SB(sb);
1045         if (status < 0) {
1046                 mlog_errno(status);
1047                 goto read_super_error;
1048         }
1049         brelse(bh);
1050         bh = NULL;
1051
1052         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1053                 status = -EINVAL;
1054                 goto read_super_error;
1055         }
1056         osb->s_mount_opt = parsed_options.mount_opt;
1057         osb->s_atime_quantum = parsed_options.atime_quantum;
1058         osb->preferred_slot = parsed_options.slot;
1059         osb->osb_commit_interval = parsed_options.commit_interval;
1060
1061         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1062         osb->osb_resv_level = parsed_options.resv_level;
1063         osb->osb_dir_resv_level = parsed_options.resv_level;
1064         if (parsed_options.dir_resv_level == -1)
1065                 osb->osb_dir_resv_level = parsed_options.resv_level;
1066         else
1067                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1068
1069         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1070         if (status)
1071                 goto read_super_error;
1072
1073         sb->s_magic = OCFS2_SUPER_MAGIC;
1074
1075         sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1076                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1077
1078         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1079          * heartbeat=none */
1080         if (bdev_read_only(sb->s_bdev)) {
1081                 if (!(sb->s_flags & MS_RDONLY)) {
1082                         status = -EACCES;
1083                         mlog(ML_ERROR, "Readonly device detected but readonly "
1084                              "mount was not specified.\n");
1085                         goto read_super_error;
1086                 }
1087
1088                 /* You should not be able to start a local heartbeat
1089                  * on a readonly device. */
1090                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1091                         status = -EROFS;
1092                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1093                              "device.\n");
1094                         goto read_super_error;
1095                 }
1096
1097                 status = ocfs2_check_journals_nolocks(osb);
1098                 if (status < 0) {
1099                         if (status == -EROFS)
1100                                 mlog(ML_ERROR, "Recovery required on readonly "
1101                                      "file system, but write access is "
1102                                      "unavailable.\n");
1103                         else
1104                                 mlog_errno(status);
1105                         goto read_super_error;
1106                 }
1107
1108                 ocfs2_set_ro_flag(osb, 1);
1109
1110                 printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1111                        "Cluster services will not be used for this mount. "
1112                        "Recovery will be skipped.\n", osb->dev_str);
1113         }
1114
1115         if (!ocfs2_is_hard_readonly(osb)) {
1116                 if (sb->s_flags & MS_RDONLY)
1117                         ocfs2_set_ro_flag(osb, 0);
1118         }
1119
1120         status = ocfs2_verify_heartbeat(osb);
1121         if (status < 0) {
1122                 mlog_errno(status);
1123                 goto read_super_error;
1124         }
1125
1126         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1127                                                  ocfs2_debugfs_root);
1128         if (!osb->osb_debug_root) {
1129                 status = -EINVAL;
1130                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1131                 goto read_super_error;
1132         }
1133
1134         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1135                                             osb->osb_debug_root,
1136                                             osb,
1137                                             &ocfs2_osb_debug_fops);
1138         if (!osb->osb_ctxt) {
1139                 status = -EINVAL;
1140                 mlog_errno(status);
1141                 goto read_super_error;
1142         }
1143
1144         if (ocfs2_meta_ecc(osb)) {
1145                 status = ocfs2_blockcheck_stats_debugfs_install(
1146                                                 &osb->osb_ecc_stats,
1147                                                 osb->osb_debug_root);
1148                 if (status) {
1149                         mlog(ML_ERROR,
1150                              "Unable to create blockcheck statistics "
1151                              "files\n");
1152                         goto read_super_error;
1153                 }
1154         }
1155
1156         status = ocfs2_mount_volume(sb);
1157         if (status < 0)
1158                 goto read_super_error;
1159
1160         if (osb->root_inode)
1161                 inode = igrab(osb->root_inode);
1162
1163         if (!inode) {
1164                 status = -EIO;
1165                 mlog_errno(status);
1166                 goto read_super_error;
1167         }
1168
1169         root = d_make_root(inode);
1170         if (!root) {
1171                 status = -ENOMEM;
1172                 mlog_errno(status);
1173                 goto read_super_error;
1174         }
1175
1176         sb->s_root = root;
1177
1178         ocfs2_complete_mount_recovery(osb);
1179
1180         if (ocfs2_mount_local(osb))
1181                 snprintf(nodestr, sizeof(nodestr), "local");
1182         else
1183                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1184
1185         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1186                "with %s data mode.\n",
1187                osb->dev_str, nodestr, osb->slot_num,
1188                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1189                "ordered");
1190
1191         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1192         wake_up(&osb->osb_mount_event);
1193
1194         /* Now we can initialize quotas because we can afford to wait
1195          * for cluster locks recovery now. That also means that truncation
1196          * log recovery can happen but that waits for proper quota setup */
1197         if (!(sb->s_flags & MS_RDONLY)) {
1198                 status = ocfs2_enable_quotas(osb);
1199                 if (status < 0) {
1200                         /* We have to err-out specially here because
1201                          * s_root is already set */
1202                         mlog_errno(status);
1203                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1204                         wake_up(&osb->osb_mount_event);
1205                         return status;
1206                 }
1207         }
1208
1209         ocfs2_complete_quota_recovery(osb);
1210
1211         /* Now we wake up again for processes waiting for quotas */
1212         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1213         wake_up(&osb->osb_mount_event);
1214
1215         /* Start this when the mount is almost sure of being successful */
1216         ocfs2_orphan_scan_start(osb);
1217
1218         return status;
1219
1220 read_super_error:
1221         brelse(bh);
1222
1223         if (osb) {
1224                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1225                 wake_up(&osb->osb_mount_event);
1226                 ocfs2_dismount_volume(sb, 1);
1227         }
1228
1229         if (status)
1230                 mlog_errno(status);
1231         return status;
1232 }
1233
1234 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1235                         int flags,
1236                         const char *dev_name,
1237                         void *data)
1238 {
1239         return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1240 }
1241
1242 static void ocfs2_kill_sb(struct super_block *sb)
1243 {
1244         struct ocfs2_super *osb = OCFS2_SB(sb);
1245
1246         /* Failed mount? */
1247         if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1248                 goto out;
1249
1250         /* Prevent further queueing of inode drop events */
1251         spin_lock(&dentry_list_lock);
1252         ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1253         spin_unlock(&dentry_list_lock);
1254         /* Wait for work to finish and/or remove it */
1255         cancel_work_sync(&osb->dentry_lock_work);
1256 out:
1257         kill_block_super(sb);
1258 }
1259
1260 static struct file_system_type ocfs2_fs_type = {
1261         .owner          = THIS_MODULE,
1262         .name           = "ocfs2",
1263         .mount          = ocfs2_mount,
1264         .kill_sb        = ocfs2_kill_sb,
1265
1266         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1267         .next           = NULL
1268 };
1269
1270 static int ocfs2_check_set_options(struct super_block *sb,
1271                                    struct mount_options *options)
1272 {
1273         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1274             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1275                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1276                 mlog(ML_ERROR, "User quotas were requested, but this "
1277                      "filesystem does not have the feature enabled.\n");
1278                 return 0;
1279         }
1280         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1281             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1282                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1283                 mlog(ML_ERROR, "Group quotas were requested, but this "
1284                      "filesystem does not have the feature enabled.\n");
1285                 return 0;
1286         }
1287         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1288             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1289                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1290                      "feature is not enabled\n");
1291                 return 0;
1292         }
1293         /* No ACL setting specified? Use XATTR feature... */
1294         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1295                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1296                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1297                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1298                 else
1299                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1300         }
1301         return 1;
1302 }
1303
1304 static int ocfs2_parse_options(struct super_block *sb,
1305                                char *options,
1306                                struct mount_options *mopt,
1307                                int is_remount)
1308 {
1309         int status, user_stack = 0;
1310         char *p;
1311         u32 tmp;
1312
1313         trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1314
1315         mopt->commit_interval = 0;
1316         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1317         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1318         mopt->slot = OCFS2_INVALID_SLOT;
1319         mopt->localalloc_opt = -1;
1320         mopt->cluster_stack[0] = '\0';
1321         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1322         mopt->dir_resv_level = -1;
1323
1324         if (!options) {
1325                 status = 1;
1326                 goto bail;
1327         }
1328
1329         while ((p = strsep(&options, ",")) != NULL) {
1330                 int token, option;
1331                 substring_t args[MAX_OPT_ARGS];
1332
1333                 if (!*p)
1334                         continue;
1335
1336                 token = match_token(p, tokens, args);
1337                 switch (token) {
1338                 case Opt_hb_local:
1339                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1340                         break;
1341                 case Opt_hb_none:
1342                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1343                         break;
1344                 case Opt_hb_global:
1345                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1346                         break;
1347                 case Opt_barrier:
1348                         if (match_int(&args[0], &option)) {
1349                                 status = 0;
1350                                 goto bail;
1351                         }
1352                         if (option)
1353                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1354                         else
1355                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1356                         break;
1357                 case Opt_intr:
1358                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1359                         break;
1360                 case Opt_nointr:
1361                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1362                         break;
1363                 case Opt_err_panic:
1364                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1365                         break;
1366                 case Opt_err_ro:
1367                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1368                         break;
1369                 case Opt_data_ordered:
1370                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1371                         break;
1372                 case Opt_data_writeback:
1373                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1374                         break;
1375                 case Opt_user_xattr:
1376                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1377                         break;
1378                 case Opt_nouser_xattr:
1379                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1380                         break;
1381                 case Opt_atime_quantum:
1382                         if (match_int(&args[0], &option)) {
1383                                 status = 0;
1384                                 goto bail;
1385                         }
1386                         if (option >= 0)
1387                                 mopt->atime_quantum = option;
1388                         break;
1389                 case Opt_slot:
1390                         option = 0;
1391                         if (match_int(&args[0], &option)) {
1392                                 status = 0;
1393                                 goto bail;
1394                         }
1395                         if (option)
1396                                 mopt->slot = (s16)option;
1397                         break;
1398                 case Opt_commit:
1399                         option = 0;
1400                         if (match_int(&args[0], &option)) {
1401                                 status = 0;
1402                                 goto bail;
1403                         }
1404                         if (option < 0)
1405                                 return 0;
1406                         if (option == 0)
1407                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1408                         mopt->commit_interval = HZ * option;
1409                         break;
1410                 case Opt_localalloc:
1411                         option = 0;
1412                         if (match_int(&args[0], &option)) {
1413                                 status = 0;
1414                                 goto bail;
1415                         }
1416                         if (option >= 0)
1417                                 mopt->localalloc_opt = option;
1418                         break;
1419                 case Opt_localflocks:
1420                         /*
1421                          * Changing this during remount could race
1422                          * flock() requests, or "unbalance" existing
1423                          * ones (e.g., a lock is taken in one mode but
1424                          * dropped in the other). If users care enough
1425                          * to flip locking modes during remount, we
1426                          * could add a "local" flag to individual
1427                          * flock structures for proper tracking of
1428                          * state.
1429                          */
1430                         if (!is_remount)
1431                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1432                         break;
1433                 case Opt_stack:
1434                         /* Check both that the option we were passed
1435                          * is of the right length and that it is a proper
1436                          * string of the right length.
1437                          */
1438                         if (((args[0].to - args[0].from) !=
1439                              OCFS2_STACK_LABEL_LEN) ||
1440                             (strnlen(args[0].from,
1441                                      OCFS2_STACK_LABEL_LEN) !=
1442                              OCFS2_STACK_LABEL_LEN)) {
1443                                 mlog(ML_ERROR,
1444                                      "Invalid cluster_stack option\n");
1445                                 status = 0;
1446                                 goto bail;
1447                         }
1448                         memcpy(mopt->cluster_stack, args[0].from,
1449                                OCFS2_STACK_LABEL_LEN);
1450                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1451                         /*
1452                          * Open code the memcmp here as we don't have
1453                          * an osb to pass to
1454                          * ocfs2_userspace_stack().
1455                          */
1456                         if (memcmp(mopt->cluster_stack,
1457                                    OCFS2_CLASSIC_CLUSTER_STACK,
1458                                    OCFS2_STACK_LABEL_LEN))
1459                                 user_stack = 1;
1460                         break;
1461                 case Opt_inode64:
1462                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1463                         break;
1464                 case Opt_usrquota:
1465                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1466                         break;
1467                 case Opt_grpquota:
1468                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1469                         break;
1470                 case Opt_coherency_buffered:
1471                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1472                         break;
1473                 case Opt_coherency_full:
1474                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1475                         break;
1476                 case Opt_acl:
1477                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1478                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1479                         break;
1480                 case Opt_noacl:
1481                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1482                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1483                         break;
1484                 case Opt_resv_level:
1485                         if (is_remount)
1486                                 break;
1487                         if (match_int(&args[0], &option)) {
1488                                 status = 0;
1489                                 goto bail;
1490                         }
1491                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1492                             option < OCFS2_MAX_RESV_LEVEL)
1493                                 mopt->resv_level = option;
1494                         break;
1495                 case Opt_dir_resv_level:
1496                         if (is_remount)
1497                                 break;
1498                         if (match_int(&args[0], &option)) {
1499                                 status = 0;
1500                                 goto bail;
1501                         }
1502                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1503                             option < OCFS2_MAX_RESV_LEVEL)
1504                                 mopt->dir_resv_level = option;
1505                         break;
1506                 default:
1507                         mlog(ML_ERROR,
1508                              "Unrecognized mount option \"%s\" "
1509                              "or missing value\n", p);
1510                         status = 0;
1511                         goto bail;
1512                 }
1513         }
1514
1515         if (user_stack == 0) {
1516                 /* Ensure only one heartbeat mode */
1517                 tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1518                                          OCFS2_MOUNT_HB_GLOBAL |
1519                                          OCFS2_MOUNT_HB_NONE);
1520                 if (hweight32(tmp) != 1) {
1521                         mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1522                         status = 0;
1523                         goto bail;
1524                 }
1525         }
1526
1527         status = 1;
1528
1529 bail:
1530         return status;
1531 }
1532
1533 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1534 {
1535         struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1536         unsigned long opts = osb->s_mount_opt;
1537         unsigned int local_alloc_megs;
1538
1539         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1540                 seq_printf(s, ",_netdev");
1541                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1542                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1543                 else
1544                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1545         } else
1546                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1547
1548         if (opts & OCFS2_MOUNT_NOINTR)
1549                 seq_printf(s, ",nointr");
1550
1551         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1552                 seq_printf(s, ",data=writeback");
1553         else
1554                 seq_printf(s, ",data=ordered");
1555
1556         if (opts & OCFS2_MOUNT_BARRIER)
1557                 seq_printf(s, ",barrier=1");
1558
1559         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1560                 seq_printf(s, ",errors=panic");
1561         else
1562                 seq_printf(s, ",errors=remount-ro");
1563
1564         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1565                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1566
1567         seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1568
1569         if (osb->osb_commit_interval)
1570                 seq_printf(s, ",commit=%u",
1571                            (unsigned) (osb->osb_commit_interval / HZ));
1572
1573         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1574         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1575                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1576
1577         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1578                 seq_printf(s, ",localflocks,");
1579
1580         if (osb->osb_cluster_stack[0])
1581                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1582                            osb->osb_cluster_stack);
1583         if (opts & OCFS2_MOUNT_USRQUOTA)
1584                 seq_printf(s, ",usrquota");
1585         if (opts & OCFS2_MOUNT_GRPQUOTA)
1586                 seq_printf(s, ",grpquota");
1587
1588         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1589                 seq_printf(s, ",coherency=buffered");
1590         else
1591                 seq_printf(s, ",coherency=full");
1592
1593         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1594                 seq_printf(s, ",nouser_xattr");
1595         else
1596                 seq_printf(s, ",user_xattr");
1597
1598         if (opts & OCFS2_MOUNT_INODE64)
1599                 seq_printf(s, ",inode64");
1600
1601         if (opts & OCFS2_MOUNT_POSIX_ACL)
1602                 seq_printf(s, ",acl");
1603         else
1604                 seq_printf(s, ",noacl");
1605
1606         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1607                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1608
1609         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1610                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1611
1612         return 0;
1613 }
1614
1615 wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
1616
1617 static int __init ocfs2_init(void)
1618 {
1619         int status, i;
1620
1621         ocfs2_print_version();
1622
1623         for (i = 0; i < OCFS2_IOEND_WQ_HASH_SZ; i++)
1624                 init_waitqueue_head(&ocfs2__ioend_wq[i]);
1625
1626         status = init_ocfs2_uptodate_cache();
1627         if (status < 0)
1628                 goto out1;
1629
1630         status = ocfs2_initialize_mem_caches();
1631         if (status < 0)
1632                 goto out2;
1633
1634         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1635         if (!ocfs2_wq) {
1636                 status = -ENOMEM;
1637                 goto out3;
1638         }
1639
1640         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1641         if (!ocfs2_debugfs_root) {
1642                 status = -EFAULT;
1643                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1644         }
1645
1646         ocfs2_set_locking_protocol();
1647
1648         status = register_quota_format(&ocfs2_quota_format);
1649         if (status < 0)
1650                 goto out4;
1651         status = register_filesystem(&ocfs2_fs_type);
1652         if (!status)
1653                 return 0;
1654
1655         unregister_quota_format(&ocfs2_quota_format);
1656 out4:
1657         destroy_workqueue(ocfs2_wq);
1658         debugfs_remove(ocfs2_debugfs_root);
1659 out3:
1660         ocfs2_free_mem_caches();
1661 out2:
1662         exit_ocfs2_uptodate_cache();
1663 out1:
1664         mlog_errno(status);
1665         return status;
1666 }
1667
1668 static void __exit ocfs2_exit(void)
1669 {
1670         if (ocfs2_wq) {
1671                 flush_workqueue(ocfs2_wq);
1672                 destroy_workqueue(ocfs2_wq);
1673         }
1674
1675         unregister_quota_format(&ocfs2_quota_format);
1676
1677         debugfs_remove(ocfs2_debugfs_root);
1678
1679         ocfs2_free_mem_caches();
1680
1681         unregister_filesystem(&ocfs2_fs_type);
1682
1683         exit_ocfs2_uptodate_cache();
1684 }
1685
1686 static void ocfs2_put_super(struct super_block *sb)
1687 {
1688         trace_ocfs2_put_super(sb);
1689
1690         ocfs2_sync_blockdev(sb);
1691         ocfs2_dismount_volume(sb, 0);
1692 }
1693
1694 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1695 {
1696         struct ocfs2_super *osb;
1697         u32 numbits, freebits;
1698         int status;
1699         struct ocfs2_dinode *bm_lock;
1700         struct buffer_head *bh = NULL;
1701         struct inode *inode = NULL;
1702
1703         trace_ocfs2_statfs(dentry->d_sb, buf);
1704
1705         osb = OCFS2_SB(dentry->d_sb);
1706
1707         inode = ocfs2_get_system_file_inode(osb,
1708                                             GLOBAL_BITMAP_SYSTEM_INODE,
1709                                             OCFS2_INVALID_SLOT);
1710         if (!inode) {
1711                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1712                 status = -EIO;
1713                 goto bail;
1714         }
1715
1716         status = ocfs2_inode_lock(inode, &bh, 0);
1717         if (status < 0) {
1718                 mlog_errno(status);
1719                 goto bail;
1720         }
1721
1722         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1723
1724         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1725         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1726
1727         buf->f_type = OCFS2_SUPER_MAGIC;
1728         buf->f_bsize = dentry->d_sb->s_blocksize;
1729         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1730         buf->f_blocks = ((sector_t) numbits) *
1731                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1732         buf->f_bfree = ((sector_t) freebits) *
1733                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1734         buf->f_bavail = buf->f_bfree;
1735         buf->f_files = numbits;
1736         buf->f_ffree = freebits;
1737         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1738                                 & 0xFFFFFFFFUL;
1739         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1740                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1741
1742         brelse(bh);
1743
1744         ocfs2_inode_unlock(inode, 0);
1745         status = 0;
1746 bail:
1747         if (inode)
1748                 iput(inode);
1749
1750         if (status)
1751                 mlog_errno(status);
1752
1753         return status;
1754 }
1755
1756 static void ocfs2_inode_init_once(void *data)
1757 {
1758         struct ocfs2_inode_info *oi = data;
1759
1760         oi->ip_flags = 0;
1761         oi->ip_open_count = 0;
1762         spin_lock_init(&oi->ip_lock);
1763         ocfs2_extent_map_init(&oi->vfs_inode);
1764         INIT_LIST_HEAD(&oi->ip_io_markers);
1765         oi->ip_dir_start_lookup = 0;
1766         atomic_set(&oi->ip_unaligned_aio, 0);
1767         init_rwsem(&oi->ip_alloc_sem);
1768         init_rwsem(&oi->ip_xattr_sem);
1769         mutex_init(&oi->ip_io_mutex);
1770
1771         oi->ip_blkno = 0ULL;
1772         oi->ip_clusters = 0;
1773
1774         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1775
1776         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1777         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1778         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1779
1780         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1781                                   &ocfs2_inode_caching_ops);
1782
1783         inode_init_once(&oi->vfs_inode);
1784 }
1785
1786 static int ocfs2_initialize_mem_caches(void)
1787 {
1788         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1789                                        sizeof(struct ocfs2_inode_info),
1790                                        0,
1791                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1792                                                 SLAB_MEM_SPREAD),
1793                                        ocfs2_inode_init_once);
1794         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1795                                         sizeof(struct ocfs2_dquot),
1796                                         0,
1797                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1798                                                 SLAB_MEM_SPREAD),
1799                                         NULL);
1800         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1801                                         sizeof(struct ocfs2_quota_chunk),
1802                                         0,
1803                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1804                                         NULL);
1805         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1806             !ocfs2_qf_chunk_cachep) {
1807                 if (ocfs2_inode_cachep)
1808                         kmem_cache_destroy(ocfs2_inode_cachep);
1809                 if (ocfs2_dquot_cachep)
1810                         kmem_cache_destroy(ocfs2_dquot_cachep);
1811                 if (ocfs2_qf_chunk_cachep)
1812                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1813                 return -ENOMEM;
1814         }
1815
1816         return 0;
1817 }
1818
1819 static void ocfs2_free_mem_caches(void)
1820 {
1821         if (ocfs2_inode_cachep)
1822                 kmem_cache_destroy(ocfs2_inode_cachep);
1823         ocfs2_inode_cachep = NULL;
1824
1825         if (ocfs2_dquot_cachep)
1826                 kmem_cache_destroy(ocfs2_dquot_cachep);
1827         ocfs2_dquot_cachep = NULL;
1828
1829         if (ocfs2_qf_chunk_cachep)
1830                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1831         ocfs2_qf_chunk_cachep = NULL;
1832 }
1833
1834 static int ocfs2_get_sector(struct super_block *sb,
1835                             struct buffer_head **bh,
1836                             int block,
1837                             int sect_size)
1838 {
1839         if (!sb_set_blocksize(sb, sect_size)) {
1840                 mlog(ML_ERROR, "unable to set blocksize\n");
1841                 return -EIO;
1842         }
1843
1844         *bh = sb_getblk(sb, block);
1845         if (!*bh) {
1846                 mlog_errno(-EIO);
1847                 return -EIO;
1848         }
1849         lock_buffer(*bh);
1850         if (!buffer_dirty(*bh))
1851                 clear_buffer_uptodate(*bh);
1852         unlock_buffer(*bh);
1853         ll_rw_block(READ, 1, bh);
1854         wait_on_buffer(*bh);
1855         if (!buffer_uptodate(*bh)) {
1856                 mlog_errno(-EIO);
1857                 brelse(*bh);
1858                 *bh = NULL;
1859                 return -EIO;
1860         }
1861
1862         return 0;
1863 }
1864
1865 static int ocfs2_mount_volume(struct super_block *sb)
1866 {
1867         int status = 0;
1868         int unlock_super = 0;
1869         struct ocfs2_super *osb = OCFS2_SB(sb);
1870
1871         if (ocfs2_is_hard_readonly(osb))
1872                 goto leave;
1873
1874         status = ocfs2_dlm_init(osb);
1875         if (status < 0) {
1876                 mlog_errno(status);
1877                 goto leave;
1878         }
1879
1880         status = ocfs2_super_lock(osb, 1);
1881         if (status < 0) {
1882                 mlog_errno(status);
1883                 goto leave;
1884         }
1885         unlock_super = 1;
1886
1887         /* This will load up the node map and add ourselves to it. */
1888         status = ocfs2_find_slot(osb);
1889         if (status < 0) {
1890                 mlog_errno(status);
1891                 goto leave;
1892         }
1893
1894         /* load all node-local system inodes */
1895         status = ocfs2_init_local_system_inodes(osb);
1896         if (status < 0) {
1897                 mlog_errno(status);
1898                 goto leave;
1899         }
1900
1901         status = ocfs2_check_volume(osb);
1902         if (status < 0) {
1903                 mlog_errno(status);
1904                 goto leave;
1905         }
1906
1907         status = ocfs2_truncate_log_init(osb);
1908         if (status < 0)
1909                 mlog_errno(status);
1910
1911 leave:
1912         if (unlock_super)
1913                 ocfs2_super_unlock(osb, 1);
1914
1915         return status;
1916 }
1917
1918 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1919 {
1920         int tmp, hangup_needed = 0;
1921         struct ocfs2_super *osb = NULL;
1922         char nodestr[8];
1923
1924         trace_ocfs2_dismount_volume(sb);
1925
1926         BUG_ON(!sb);
1927         osb = OCFS2_SB(sb);
1928         BUG_ON(!osb);
1929
1930         debugfs_remove(osb->osb_ctxt);
1931
1932         /*
1933          * Flush inode dropping work queue so that deletes are
1934          * performed while the filesystem is still working
1935          */
1936         ocfs2_drop_all_dl_inodes(osb);
1937
1938         /* Orphan scan should be stopped as early as possible */
1939         ocfs2_orphan_scan_stop(osb);
1940
1941         ocfs2_disable_quotas(osb);
1942
1943         ocfs2_shutdown_local_alloc(osb);
1944
1945         ocfs2_truncate_log_shutdown(osb);
1946
1947         /* This will disable recovery and flush any recovery work. */
1948         ocfs2_recovery_exit(osb);
1949
1950         ocfs2_journal_shutdown(osb);
1951
1952         ocfs2_sync_blockdev(sb);
1953
1954         ocfs2_purge_refcount_trees(osb);
1955
1956         /* No cluster connection means we've failed during mount, so skip
1957          * all the steps which depended on that to complete. */
1958         if (osb->cconn) {
1959                 tmp = ocfs2_super_lock(osb, 1);
1960                 if (tmp < 0) {
1961                         mlog_errno(tmp);
1962                         return;
1963                 }
1964         }
1965
1966         if (osb->slot_num != OCFS2_INVALID_SLOT)
1967                 ocfs2_put_slot(osb);
1968
1969         if (osb->cconn)
1970                 ocfs2_super_unlock(osb, 1);
1971
1972         ocfs2_release_system_inodes(osb);
1973
1974         /*
1975          * If we're dismounting due to mount error, mount.ocfs2 will clean
1976          * up heartbeat.  If we're a local mount, there is no heartbeat.
1977          * If we failed before we got a uuid_str yet, we can't stop
1978          * heartbeat.  Otherwise, do it.
1979          */
1980         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1981             !ocfs2_is_hard_readonly(osb))
1982                 hangup_needed = 1;
1983
1984         if (osb->cconn)
1985                 ocfs2_dlm_shutdown(osb, hangup_needed);
1986
1987         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1988         debugfs_remove(osb->osb_debug_root);
1989
1990         if (hangup_needed)
1991                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1992
1993         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1994
1995         if (ocfs2_mount_local(osb))
1996                 snprintf(nodestr, sizeof(nodestr), "local");
1997         else
1998                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1999
2000         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
2001                osb->dev_str, nodestr);
2002
2003         ocfs2_delete_osb(osb);
2004         kfree(osb);
2005         sb->s_dev = 0;
2006         sb->s_fs_info = NULL;
2007 }
2008
2009 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2010                                 unsigned uuid_bytes)
2011 {
2012         int i, ret;
2013         char *ptr;
2014
2015         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2016
2017         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2018         if (osb->uuid_str == NULL)
2019                 return -ENOMEM;
2020
2021         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2022                 /* print with null */
2023                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
2024                 if (ret != 2) /* drop super cleans up */
2025                         return -EINVAL;
2026                 /* then only advance past the last char */
2027                 ptr += 2;
2028         }
2029
2030         return 0;
2031 }
2032
2033 /* Make sure entire volume is addressable by our journal.  Requires
2034    osb_clusters_at_boot to be valid and for the journal to have been
2035    initialized by ocfs2_journal_init(). */
2036 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2037 {
2038         int status = 0;
2039         u64 max_block =
2040                 ocfs2_clusters_to_blocks(osb->sb,
2041                                          osb->osb_clusters_at_boot) - 1;
2042
2043         /* 32-bit block number is always OK. */
2044         if (max_block <= (u32)~0ULL)
2045                 goto out;
2046
2047         /* Volume is "huge", so see if our journal is new enough to
2048            support it. */
2049         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2050                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2051               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2052                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2053                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2054                      "Enable the 'block64' journal option with tunefs.ocfs2");
2055                 status = -EFBIG;
2056                 goto out;
2057         }
2058
2059  out:
2060         return status;
2061 }
2062
2063 static int ocfs2_initialize_super(struct super_block *sb,
2064                                   struct buffer_head *bh,
2065                                   int sector_size,
2066                                   struct ocfs2_blockcheck_stats *stats)
2067 {
2068         int status;
2069         int i, cbits, bbits;
2070         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2071         struct inode *inode = NULL;
2072         struct ocfs2_journal *journal;
2073         __le32 uuid_net_key;
2074         struct ocfs2_super *osb;
2075         u64 total_blocks;
2076
2077         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2078         if (!osb) {
2079                 status = -ENOMEM;
2080                 mlog_errno(status);
2081                 goto bail;
2082         }
2083
2084         sb->s_fs_info = osb;
2085         sb->s_op = &ocfs2_sops;
2086         sb->s_d_op = &ocfs2_dentry_ops;
2087         sb->s_export_op = &ocfs2_export_ops;
2088         sb->s_qcop = &ocfs2_quotactl_ops;
2089         sb->dq_op = &ocfs2_quota_operations;
2090         sb->s_xattr = ocfs2_xattr_handlers;
2091         sb->s_time_gran = 1;
2092         sb->s_flags |= MS_NOATIME;
2093         /* this is needed to support O_LARGEFILE */
2094         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2095         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2096         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2097
2098         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2099
2100         for (i = 0; i < 3; i++)
2101                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2102         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2103
2104         osb->sb = sb;
2105         /* Save off for ocfs2_rw_direct */
2106         osb->s_sectsize_bits = blksize_bits(sector_size);
2107         BUG_ON(!osb->s_sectsize_bits);
2108
2109         spin_lock_init(&osb->dc_task_lock);
2110         init_waitqueue_head(&osb->dc_event);
2111         osb->dc_work_sequence = 0;
2112         osb->dc_wake_sequence = 0;
2113         INIT_LIST_HEAD(&osb->blocked_lock_list);
2114         osb->blocked_lock_count = 0;
2115         spin_lock_init(&osb->osb_lock);
2116         spin_lock_init(&osb->osb_xattr_lock);
2117         ocfs2_init_steal_slots(osb);
2118
2119         atomic_set(&osb->alloc_stats.moves, 0);
2120         atomic_set(&osb->alloc_stats.local_data, 0);
2121         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2122         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2123         atomic_set(&osb->alloc_stats.bg_extends, 0);
2124
2125         /* Copy the blockcheck stats from the superblock probe */
2126         osb->osb_ecc_stats = *stats;
2127
2128         ocfs2_init_node_maps(osb);
2129
2130         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2131                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2132
2133         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2134         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2135                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2136                      osb->max_slots);
2137                 status = -EINVAL;
2138                 goto bail;
2139         }
2140
2141         ocfs2_orphan_scan_init(osb);
2142
2143         status = ocfs2_recovery_init(osb);
2144         if (status) {
2145                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2146                 mlog_errno(status);
2147                 goto bail;
2148         }
2149
2150         init_waitqueue_head(&osb->checkpoint_event);
2151         atomic_set(&osb->needs_checkpoint, 0);
2152
2153         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2154
2155         osb->slot_num = OCFS2_INVALID_SLOT;
2156
2157         osb->s_xattr_inline_size = le16_to_cpu(
2158                                         di->id2.i_super.s_xattr_inline_size);
2159
2160         osb->local_alloc_state = OCFS2_LA_UNUSED;
2161         osb->local_alloc_bh = NULL;
2162         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2163
2164         init_waitqueue_head(&osb->osb_mount_event);
2165
2166         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2167         if (status) {
2168                 mlog_errno(status);
2169                 goto bail;
2170         }
2171
2172         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2173         if (!osb->vol_label) {
2174                 mlog(ML_ERROR, "unable to alloc vol label\n");
2175                 status = -ENOMEM;
2176                 goto bail;
2177         }
2178
2179         osb->slot_recovery_generations =
2180                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2181                         GFP_KERNEL);
2182         if (!osb->slot_recovery_generations) {
2183                 status = -ENOMEM;
2184                 mlog_errno(status);
2185                 goto bail;
2186         }
2187
2188         init_waitqueue_head(&osb->osb_wipe_event);
2189         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2190                                         sizeof(*osb->osb_orphan_wipes),
2191                                         GFP_KERNEL);
2192         if (!osb->osb_orphan_wipes) {
2193                 status = -ENOMEM;
2194                 mlog_errno(status);
2195                 goto bail;
2196         }
2197
2198         osb->osb_rf_lock_tree = RB_ROOT;
2199
2200         osb->s_feature_compat =
2201                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2202         osb->s_feature_ro_compat =
2203                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2204         osb->s_feature_incompat =
2205                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2206
2207         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2208                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2209                      "optional features (%x).\n", i);
2210                 status = -EINVAL;
2211                 goto bail;
2212         }
2213         if (!(osb->sb->s_flags & MS_RDONLY) &&
2214             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2215                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2216                      "unsupported optional features (%x).\n", i);
2217                 status = -EINVAL;
2218                 goto bail;
2219         }
2220
2221         if (ocfs2_clusterinfo_valid(osb)) {
2222                 osb->osb_stackflags =
2223                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2224                 memcpy(osb->osb_cluster_stack,
2225                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2226                        OCFS2_STACK_LABEL_LEN);
2227                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2228                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2229                         mlog(ML_ERROR,
2230                              "couldn't mount because of an invalid "
2231                              "cluster stack label (%s) \n",
2232                              osb->osb_cluster_stack);
2233                         status = -EINVAL;
2234                         goto bail;
2235                 }
2236         } else {
2237                 /* The empty string is identical with classic tools that
2238                  * don't know about s_cluster_info. */
2239                 osb->osb_cluster_stack[0] = '\0';
2240         }
2241
2242         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2243
2244         /* FIXME
2245          * This should be done in ocfs2_journal_init(), but unknown
2246          * ordering issues will cause the filesystem to crash.
2247          * If anyone wants to figure out what part of the code
2248          * refers to osb->journal before ocfs2_journal_init() is run,
2249          * be my guest.
2250          */
2251         /* initialize our journal structure */
2252
2253         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2254         if (!journal) {
2255                 mlog(ML_ERROR, "unable to alloc journal\n");
2256                 status = -ENOMEM;
2257                 goto bail;
2258         }
2259         osb->journal = journal;
2260         journal->j_osb = osb;
2261
2262         atomic_set(&journal->j_num_trans, 0);
2263         init_rwsem(&journal->j_trans_barrier);
2264         init_waitqueue_head(&journal->j_checkpointed);
2265         spin_lock_init(&journal->j_lock);
2266         journal->j_trans_id = (unsigned long) 1;
2267         INIT_LIST_HEAD(&journal->j_la_cleanups);
2268         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2269         journal->j_state = OCFS2_JOURNAL_FREE;
2270
2271         INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2272         osb->dentry_lock_list = NULL;
2273
2274         /* get some pseudo constants for clustersize bits */
2275         osb->s_clustersize_bits =
2276                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2277         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2278
2279         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2280             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2281                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2282                      osb->s_clustersize);
2283                 status = -EINVAL;
2284                 goto bail;
2285         }
2286
2287         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2288                                                 le32_to_cpu(di->i_clusters));
2289
2290         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2291                                            total_blocks);
2292         if (status) {
2293                 mlog(ML_ERROR, "Volume too large "
2294                      "to mount safely on this system");
2295                 status = -EFBIG;
2296                 goto bail;
2297         }
2298
2299         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2300                                  sizeof(di->id2.i_super.s_uuid))) {
2301                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2302                 status = -ENOMEM;
2303                 goto bail;
2304         }
2305
2306         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2307
2308         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2309         osb->vol_label[63] = '\0';
2310         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2311         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2312         osb->first_cluster_group_blkno =
2313                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2314         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2315         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2316         trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2317                                      (unsigned long long)osb->root_blkno,
2318                                      (unsigned long long)osb->system_dir_blkno,
2319                                      osb->s_clustersize_bits);
2320
2321         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2322         if (!osb->osb_dlm_debug) {
2323                 status = -ENOMEM;
2324                 mlog_errno(status);
2325                 goto bail;
2326         }
2327
2328         atomic_set(&osb->vol_state, VOLUME_INIT);
2329
2330         /* load root, system_dir, and all global system inodes */
2331         status = ocfs2_init_global_system_inodes(osb);
2332         if (status < 0) {
2333                 mlog_errno(status);
2334                 goto bail;
2335         }
2336
2337         /*
2338          * global bitmap
2339          */
2340         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2341                                             OCFS2_INVALID_SLOT);
2342         if (!inode) {
2343                 status = -EINVAL;
2344                 mlog_errno(status);
2345                 goto bail;
2346         }
2347
2348         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2349         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2350         iput(inode);
2351
2352         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2353                                  osb->s_feature_incompat) * 8;
2354
2355         status = ocfs2_init_slot_info(osb);
2356         if (status < 0) {
2357                 mlog_errno(status);
2358                 goto bail;
2359         }
2360         cleancache_init_shared_fs((char *)&di->id2.i_super.s_uuid, sb);
2361
2362 bail:
2363         return status;
2364 }
2365
2366 /*
2367  * will return: -EAGAIN if it is ok to keep searching for superblocks
2368  *              -EINVAL if there is a bad superblock
2369  *              0 on success
2370  */
2371 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2372                                struct buffer_head *bh,
2373                                u32 blksz,
2374                                struct ocfs2_blockcheck_stats *stats)
2375 {
2376         int status = -EAGAIN;
2377
2378         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2379                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2380                 /* We have to do a raw check of the feature here */
2381                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2382                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2383                         status = ocfs2_block_check_validate(bh->b_data,
2384                                                             bh->b_size,
2385                                                             &di->i_check,
2386                                                             stats);
2387                         if (status)
2388                                 goto out;
2389                 }
2390                 status = -EINVAL;
2391                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2392                         mlog(ML_ERROR, "found superblock with incorrect block "
2393                              "size: found %u, should be %u\n",
2394                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2395                                blksz);
2396                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2397                            OCFS2_MAJOR_REV_LEVEL ||
2398                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2399                            OCFS2_MINOR_REV_LEVEL) {
2400                         mlog(ML_ERROR, "found superblock with bad version: "
2401                              "found %u.%u, should be %u.%u\n",
2402                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2403                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2404                              OCFS2_MAJOR_REV_LEVEL,
2405                              OCFS2_MINOR_REV_LEVEL);
2406                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2407                         mlog(ML_ERROR, "bad block number on superblock: "
2408                              "found %llu, should be %llu\n",
2409                              (unsigned long long)le64_to_cpu(di->i_blkno),
2410                              (unsigned long long)bh->b_blocknr);
2411                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2412                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2413                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2414                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2415                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2416                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2417                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2418                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2419                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2420                         mlog(ML_ERROR,
2421                              "Superblock slots found greater than file system "
2422                              "maximum: found %u, max %u\n",
2423                              le16_to_cpu(di->id2.i_super.s_max_slots),
2424                              OCFS2_MAX_SLOTS);
2425                 } else {
2426                         /* found it! */
2427                         status = 0;
2428                 }
2429         }
2430
2431 out:
2432         if (status && status != -EAGAIN)
2433                 mlog_errno(status);
2434         return status;
2435 }
2436
2437 static int ocfs2_check_volume(struct ocfs2_super *osb)
2438 {
2439         int status;
2440         int dirty;
2441         int local;
2442         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2443                                                   * recover
2444                                                   * ourselves. */
2445
2446         /* Init our journal object. */
2447         status = ocfs2_journal_init(osb->journal, &dirty);
2448         if (status < 0) {
2449                 mlog(ML_ERROR, "Could not initialize journal!\n");
2450                 goto finally;
2451         }
2452
2453         /* Now that journal has been initialized, check to make sure
2454            entire volume is addressable. */
2455         status = ocfs2_journal_addressable(osb);
2456         if (status)
2457                 goto finally;
2458
2459         /* If the journal was unmounted cleanly then we don't want to
2460          * recover anything. Otherwise, journal_load will do that
2461          * dirty work for us :) */
2462         if (!dirty) {
2463                 status = ocfs2_journal_wipe(osb->journal, 0);
2464                 if (status < 0) {
2465                         mlog_errno(status);
2466                         goto finally;
2467                 }
2468         } else {
2469                 printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2470                        "unmounted cleanly, recovering it.\n", osb->dev_str);
2471         }
2472
2473         local = ocfs2_mount_local(osb);
2474
2475         /* will play back anything left in the journal. */
2476         status = ocfs2_journal_load(osb->journal, local, dirty);
2477         if (status < 0) {
2478                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2479                 goto finally;
2480         }
2481
2482         if (dirty) {
2483                 /* recover my local alloc if we didn't unmount cleanly. */
2484                 status = ocfs2_begin_local_alloc_recovery(osb,
2485                                                           osb->slot_num,
2486                                                           &local_alloc);
2487                 if (status < 0) {
2488                         mlog_errno(status);
2489                         goto finally;
2490                 }
2491                 /* we complete the recovery process after we've marked
2492                  * ourselves as mounted. */
2493         }
2494
2495         status = ocfs2_load_local_alloc(osb);
2496         if (status < 0) {
2497                 mlog_errno(status);
2498                 goto finally;
2499         }
2500
2501         if (dirty) {
2502                 /* Recovery will be completed after we've mounted the
2503                  * rest of the volume. */
2504                 osb->dirty = 1;
2505                 osb->local_alloc_copy = local_alloc;
2506                 local_alloc = NULL;
2507         }
2508
2509         /* go through each journal, trylock it and if you get the
2510          * lock, and it's marked as dirty, set the bit in the recover
2511          * map and launch a recovery thread for it. */
2512         status = ocfs2_mark_dead_nodes(osb);
2513         if (status < 0) {
2514                 mlog_errno(status);
2515                 goto finally;
2516         }
2517
2518         status = ocfs2_compute_replay_slots(osb);
2519         if (status < 0)
2520                 mlog_errno(status);
2521
2522 finally:
2523         if (local_alloc)
2524                 kfree(local_alloc);
2525
2526         if (status)
2527                 mlog_errno(status);
2528         return status;
2529 }
2530
2531 /*
2532  * The routine gets called from dismount or close whenever a dismount on
2533  * volume is requested and the osb open count becomes 1.
2534  * It will remove the osb from the global list and also free up all the
2535  * initialized resources and fileobject.
2536  */
2537 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2538 {
2539         /* This function assumes that the caller has the main osb resource */
2540
2541         ocfs2_free_slot_info(osb);
2542
2543         kfree(osb->osb_orphan_wipes);
2544         kfree(osb->slot_recovery_generations);
2545         /* FIXME
2546          * This belongs in journal shutdown, but because we have to
2547          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2548          * we free it here.
2549          */
2550         kfree(osb->journal);
2551         if (osb->local_alloc_copy)
2552                 kfree(osb->local_alloc_copy);
2553         kfree(osb->uuid_str);
2554         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2555         memset(osb, 0, sizeof(struct ocfs2_super));
2556 }
2557
2558 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2559  * panic(). We do not support continue-on-error operation. */
2560 static void ocfs2_handle_error(struct super_block *sb)
2561 {
2562         struct ocfs2_super *osb = OCFS2_SB(sb);
2563
2564         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2565                 panic("OCFS2: (device %s): panic forced after error\n",
2566                       sb->s_id);
2567
2568         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2569
2570         if (sb->s_flags & MS_RDONLY &&
2571             (ocfs2_is_soft_readonly(osb) ||
2572              ocfs2_is_hard_readonly(osb)))
2573                 return;
2574
2575         printk(KERN_CRIT "File system is now read-only due to the potential "
2576                "of on-disk corruption. Please run fsck.ocfs2 once the file "
2577                "system is unmounted.\n");
2578         sb->s_flags |= MS_RDONLY;
2579         ocfs2_set_ro_flag(osb, 0);
2580 }
2581
2582 static char error_buf[1024];
2583
2584 void __ocfs2_error(struct super_block *sb,
2585                    const char *function,
2586                    const char *fmt, ...)
2587 {
2588         va_list args;
2589
2590         va_start(args, fmt);
2591         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2592         va_end(args);
2593
2594         /* Not using mlog here because we want to show the actual
2595          * function the error came from. */
2596         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2597                sb->s_id, function, error_buf);
2598
2599         ocfs2_handle_error(sb);
2600 }
2601
2602 /* Handle critical errors. This is intentionally more drastic than
2603  * ocfs2_handle_error, so we only use for things like journal errors,
2604  * etc. */
2605 void __ocfs2_abort(struct super_block* sb,
2606                    const char *function,
2607                    const char *fmt, ...)
2608 {
2609         va_list args;
2610
2611         va_start(args, fmt);
2612         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2613         va_end(args);
2614
2615         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2616                sb->s_id, function, error_buf);
2617
2618         /* We don't have the cluster support yet to go straight to
2619          * hard readonly in here. Until then, we want to keep
2620          * ocfs2_abort() so that we can at least mark critical
2621          * errors.
2622          *
2623          * TODO: This should abort the journal and alert other nodes
2624          * that our slot needs recovery. */
2625
2626         /* Force a panic(). This stinks, but it's better than letting
2627          * things continue without having a proper hard readonly
2628          * here. */
2629         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2630                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2631         ocfs2_handle_error(sb);
2632 }
2633
2634 /*
2635  * Void signal blockers, because in-kernel sigprocmask() only fails
2636  * when SIG_* is wrong.
2637  */
2638 void ocfs2_block_signals(sigset_t *oldset)
2639 {
2640         int rc;
2641         sigset_t blocked;
2642
2643         sigfillset(&blocked);
2644         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2645         BUG_ON(rc);
2646 }
2647
2648 void ocfs2_unblock_signals(sigset_t *oldset)
2649 {
2650         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2651         BUG_ON(rc);
2652 }
2653
2654 module_init(ocfs2_init);
2655 module_exit(ocfs2_exit);