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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/super.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* -*- mode: c; c-basic-offset: 8; -*-
  3  * vim: noexpandtab sw=8 ts=8 sts=0:
  4  *
  5  * super.c
  6  *
  7  * load/unload driver, mount/dismount volumes
  8  *
  9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/fs.h>
 14 #include <linux/types.h>
 15 #include <linux/slab.h>
 16 #include <linux/highmem.h>
 17 #include <linux/init.h>
 18 #include <linux/random.h>
 19 #include <linux/statfs.h>
 20 #include <linux/moduleparam.h>
 21 #include <linux/blkdev.h>
 22 #include <linux/socket.h>
 23 #include <linux/inet.h>
 24 #include <linux/parser.h>
 25 #include <linux/crc32.h>
 26 #include <linux/debugfs.h>
 27 #include <linux/mount.h>
 28 #include <linux/seq_file.h>
 29 #include <linux/quotaops.h>
 30 #include <linux/cleancache.h>
 31 #include <linux/signal.h>
 32 
 33 #define CREATE_TRACE_POINTS
 34 #include "ocfs2_trace.h"
 35 
 36 #include <cluster/masklog.h>
 37 
 38 #include "ocfs2.h"
 39 
 40 /* this should be the only file to include a version 1 header */
 41 #include "ocfs1_fs_compat.h"
 42 
 43 #include "alloc.h"
 44 #include "aops.h"
 45 #include "blockcheck.h"
 46 #include "dlmglue.h"
 47 #include "export.h"
 48 #include "extent_map.h"
 49 #include "heartbeat.h"
 50 #include "inode.h"
 51 #include "journal.h"
 52 #include "localalloc.h"
 53 #include "namei.h"
 54 #include "slot_map.h"
 55 #include "super.h"
 56 #include "sysfile.h"
 57 #include "uptodate.h"
 58 #include "xattr.h"
 59 #include "quota.h"
 60 #include "refcounttree.h"
 61 #include "suballoc.h"
 62 
 63 #include "buffer_head_io.h"
 64 #include "filecheck.h"
 65 
 66 static struct kmem_cache *ocfs2_inode_cachep;
 67 struct kmem_cache *ocfs2_dquot_cachep;
 68 struct kmem_cache *ocfs2_qf_chunk_cachep;
 69 
 70 static struct dentry *ocfs2_debugfs_root;
 71 
 72 MODULE_AUTHOR("Oracle");
 73 MODULE_LICENSE("GPL");
 74 MODULE_DESCRIPTION("OCFS2 cluster file system");
 75 
 76 struct mount_options
 77 {
 78         unsigned long   commit_interval;
 79         unsigned long   mount_opt;
 80         unsigned int    atime_quantum;
 81         signed short    slot;
 82         int             localalloc_opt;
 83         unsigned int    resv_level;
 84         int             dir_resv_level;
 85         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
 86 };
 87 
 88 static int ocfs2_parse_options(struct super_block *sb, char *options,
 89                                struct mount_options *mopt,
 90                                int is_remount);
 91 static int ocfs2_check_set_options(struct super_block *sb,
 92                                    struct mount_options *options);
 93 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
 94 static void ocfs2_put_super(struct super_block *sb);
 95 static int ocfs2_mount_volume(struct super_block *sb);
 96 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 97 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 98 static int ocfs2_initialize_mem_caches(void);
 99 static void ocfs2_free_mem_caches(void);
100 static void ocfs2_delete_osb(struct ocfs2_super *osb);
101 
102 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
103 
104 static int ocfs2_sync_fs(struct super_block *sb, int wait);
105 
106 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
107 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
108 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
109 static int ocfs2_check_volume(struct ocfs2_super *osb);
110 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
111                                struct buffer_head *bh,
112                                u32 sectsize,
113                                struct ocfs2_blockcheck_stats *stats);
114 static int ocfs2_initialize_super(struct super_block *sb,
115                                   struct buffer_head *bh,
116                                   int sector_size,
117                                   struct ocfs2_blockcheck_stats *stats);
118 static int ocfs2_get_sector(struct super_block *sb,
119                             struct buffer_head **bh,
120                             int block,
121                             int sect_size);
122 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
123 static void ocfs2_free_inode(struct inode *inode);
124 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
125 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
126 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
127 
128 static struct dquot **ocfs2_get_dquots(struct inode *inode)
129 {
130         return OCFS2_I(inode)->i_dquot;
131 }
132 
133 static const struct super_operations ocfs2_sops = {
134         .statfs         = ocfs2_statfs,
135         .alloc_inode    = ocfs2_alloc_inode,
136         .free_inode     = ocfs2_free_inode,
137         .drop_inode     = ocfs2_drop_inode,
138         .evict_inode    = ocfs2_evict_inode,
139         .sync_fs        = ocfs2_sync_fs,
140         .put_super      = ocfs2_put_super,
141         .remount_fs     = ocfs2_remount,
142         .show_options   = ocfs2_show_options,
143         .quota_read     = ocfs2_quota_read,
144         .quota_write    = ocfs2_quota_write,
145         .get_dquots     = ocfs2_get_dquots,
146 };
147 
148 enum {
149         Opt_barrier,
150         Opt_err_panic,
151         Opt_err_ro,
152         Opt_intr,
153         Opt_nointr,
154         Opt_hb_none,
155         Opt_hb_local,
156         Opt_hb_global,
157         Opt_data_ordered,
158         Opt_data_writeback,
159         Opt_atime_quantum,
160         Opt_slot,
161         Opt_commit,
162         Opt_localalloc,
163         Opt_localflocks,
164         Opt_stack,
165         Opt_user_xattr,
166         Opt_nouser_xattr,
167         Opt_inode64,
168         Opt_acl,
169         Opt_noacl,
170         Opt_usrquota,
171         Opt_grpquota,
172         Opt_coherency_buffered,
173         Opt_coherency_full,
174         Opt_resv_level,
175         Opt_dir_resv_level,
176         Opt_journal_async_commit,
177         Opt_err_cont,
178         Opt_nocluster,
179         Opt_err,
180 };
181 
182 static const match_table_t tokens = {
183         {Opt_barrier, "barrier=%u"},
184         {Opt_err_panic, "errors=panic"},
185         {Opt_err_ro, "errors=remount-ro"},
186         {Opt_intr, "intr"},
187         {Opt_nointr, "nointr"},
188         {Opt_hb_none, OCFS2_HB_NONE},
189         {Opt_hb_local, OCFS2_HB_LOCAL},
190         {Opt_hb_global, OCFS2_HB_GLOBAL},
191         {Opt_data_ordered, "data=ordered"},
192         {Opt_data_writeback, "data=writeback"},
193         {Opt_atime_quantum, "atime_quantum=%u"},
194         {Opt_slot, "preferred_slot=%u"},
195         {Opt_commit, "commit=%u"},
196         {Opt_localalloc, "localalloc=%d"},
197         {Opt_localflocks, "localflocks"},
198         {Opt_stack, "cluster_stack=%s"},
199         {Opt_user_xattr, "user_xattr"},
200         {Opt_nouser_xattr, "nouser_xattr"},
201         {Opt_inode64, "inode64"},
202         {Opt_acl, "acl"},
203         {Opt_noacl, "noacl"},
204         {Opt_usrquota, "usrquota"},
205         {Opt_grpquota, "grpquota"},
206         {Opt_coherency_buffered, "coherency=buffered"},
207         {Opt_coherency_full, "coherency=full"},
208         {Opt_resv_level, "resv_level=%u"},
209         {Opt_dir_resv_level, "dir_resv_level=%u"},
210         {Opt_journal_async_commit, "journal_async_commit"},
211         {Opt_err_cont, "errors=continue"},
212         {Opt_nocluster, "nocluster"},
213         {Opt_err, NULL}
214 };
215 
216 #ifdef CONFIG_DEBUG_FS
217 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
218 {
219         struct ocfs2_cluster_connection *cconn = osb->cconn;
220         struct ocfs2_recovery_map *rm = osb->recovery_map;
221         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
222         int i, out = 0;
223         unsigned long flags;
224 
225         out += scnprintf(buf + out, len - out,
226                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
227                         "Device", osb->dev_str, osb->uuid_str,
228                         osb->fs_generation, osb->vol_label);
229 
230         out += scnprintf(buf + out, len - out,
231                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
232                         atomic_read(&osb->vol_state), osb->osb_flags);
233 
234         out += scnprintf(buf + out, len - out,
235                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
236                         osb->sb->s_blocksize, osb->s_clustersize);
237 
238         out += scnprintf(buf + out, len - out,
239                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
240                         "ROcompat: 0x%X\n",
241                         "Features", osb->s_feature_compat,
242                         osb->s_feature_incompat, osb->s_feature_ro_compat);
243 
244         out += scnprintf(buf + out, len - out,
245                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
246                         osb->s_mount_opt, osb->s_atime_quantum);
247 
248         if (cconn) {
249                 out += scnprintf(buf + out, len - out,
250                                 "%10s => Stack: %s  Name: %*s  "
251                                 "Version: %d.%d\n", "Cluster",
252                                 (*osb->osb_cluster_stack == '\0' ?
253                                  "o2cb" : osb->osb_cluster_stack),
254                                 cconn->cc_namelen, cconn->cc_name,
255                                 cconn->cc_version.pv_major,
256                                 cconn->cc_version.pv_minor);
257         }
258 
259         spin_lock_irqsave(&osb->dc_task_lock, flags);
260         out += scnprintf(buf + out, len - out,
261                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
262                         "WorkSeq: %lu\n", "DownCnvt",
263                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
264                         osb->blocked_lock_count, osb->dc_wake_sequence,
265                         osb->dc_work_sequence);
266         spin_unlock_irqrestore(&osb->dc_task_lock, flags);
267 
268         spin_lock(&osb->osb_lock);
269         out += scnprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
270                         "Recovery",
271                         (osb->recovery_thread_task ?
272                          task_pid_nr(osb->recovery_thread_task) : -1));
273         if (rm->rm_used == 0)
274                 out += scnprintf(buf + out, len - out, " None\n");
275         else {
276                 for (i = 0; i < rm->rm_used; i++)
277                         out += scnprintf(buf + out, len - out, " %d",
278                                         rm->rm_entries[i]);
279                 out += scnprintf(buf + out, len - out, "\n");
280         }
281         spin_unlock(&osb->osb_lock);
282 
283         out += scnprintf(buf + out, len - out,
284                         "%10s => Pid: %d  Interval: %lu\n", "Commit",
285                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
286                         osb->osb_commit_interval);
287 
288         out += scnprintf(buf + out, len - out,
289                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
290                         "Journal", osb->journal->j_state,
291                         osb->journal->j_trans_id,
292                         atomic_read(&osb->journal->j_num_trans));
293 
294         out += scnprintf(buf + out, len - out,
295                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
296                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
297                         "Stats",
298                         atomic_read(&osb->alloc_stats.bitmap_data),
299                         atomic_read(&osb->alloc_stats.local_data),
300                         atomic_read(&osb->alloc_stats.bg_allocs),
301                         atomic_read(&osb->alloc_stats.moves),
302                         atomic_read(&osb->alloc_stats.bg_extends));
303 
304         out += scnprintf(buf + out, len - out,
305                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
306                         "Default: %u bits\n",
307                         "LocalAlloc", osb->local_alloc_state,
308                         (unsigned long long)osb->la_last_gd,
309                         osb->local_alloc_bits, osb->local_alloc_default_bits);
310 
311         spin_lock(&osb->osb_lock);
312         out += scnprintf(buf + out, len - out,
313                         "%10s => InodeSlot: %d  StolenInodes: %d, "
314                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
315                         osb->s_inode_steal_slot,
316                         atomic_read(&osb->s_num_inodes_stolen),
317                         osb->s_meta_steal_slot,
318                         atomic_read(&osb->s_num_meta_stolen));
319         spin_unlock(&osb->osb_lock);
320 
321         out += scnprintf(buf + out, len - out, "OrphanScan => ");
322         out += scnprintf(buf + out, len - out, "Local: %u  Global: %u ",
323                         os->os_count, os->os_seqno);
324         out += scnprintf(buf + out, len - out, " Last Scan: ");
325         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
326                 out += scnprintf(buf + out, len - out, "Disabled\n");
327         else
328                 out += scnprintf(buf + out, len - out, "%lu seconds ago\n",
329                                 (unsigned long)(ktime_get_seconds() - os->os_scantime));
330 
331         out += scnprintf(buf + out, len - out, "%10s => %3s  %10s\n",
332                         "Slots", "Num", "RecoGen");
333         for (i = 0; i < osb->max_slots; ++i) {
334                 out += scnprintf(buf + out, len - out,
335                                 "%10s  %c %3d  %10d\n",
336                                 " ",
337                                 (i == osb->slot_num ? '*' : ' '),
338                                 i, osb->slot_recovery_generations[i]);
339         }
340 
341         return out;
342 }
343 
344 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
345 {
346         struct ocfs2_super *osb = inode->i_private;
347         char *buf = NULL;
348 
349         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
350         if (!buf)
351                 goto bail;
352 
353         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
354 
355         file->private_data = buf;
356 
357         return 0;
358 bail:
359         return -ENOMEM;
360 }
361 
362 static int ocfs2_debug_release(struct inode *inode, struct file *file)
363 {
364         kfree(file->private_data);
365         return 0;
366 }
367 
368 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
369                                 size_t nbytes, loff_t *ppos)
370 {
371         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
372                                        i_size_read(file->f_mapping->host));
373 }
374 #else
375 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
376 {
377         return 0;
378 }
379 static int ocfs2_debug_release(struct inode *inode, struct file *file)
380 {
381         return 0;
382 }
383 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
384                                 size_t nbytes, loff_t *ppos)
385 {
386         return 0;
387 }
388 #endif  /* CONFIG_DEBUG_FS */
389 
390 static const struct file_operations ocfs2_osb_debug_fops = {
391         .open =         ocfs2_osb_debug_open,
392         .release =      ocfs2_debug_release,
393         .read =         ocfs2_debug_read,
394         .llseek =       generic_file_llseek,
395 };
396 
397 static int ocfs2_sync_fs(struct super_block *sb, int wait)
398 {
399         int status;
400         tid_t target;
401         struct ocfs2_super *osb = OCFS2_SB(sb);
402 
403         if (ocfs2_is_hard_readonly(osb))
404                 return -EROFS;
405 
406         if (wait) {
407                 status = ocfs2_flush_truncate_log(osb);
408                 if (status < 0)
409                         mlog_errno(status);
410         } else {
411                 ocfs2_schedule_truncate_log_flush(osb, 0);
412         }
413 
414         if (jbd2_journal_start_commit(osb->journal->j_journal,
415                                       &target)) {
416                 if (wait)
417                         jbd2_log_wait_commit(osb->journal->j_journal,
418                                              target);
419         }
420         return 0;
421 }
422 
423 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
424 {
425         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
426             && (ino == USER_QUOTA_SYSTEM_INODE
427                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
428                 return 0;
429         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
430             && (ino == GROUP_QUOTA_SYSTEM_INODE
431                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
432                 return 0;
433         return 1;
434 }
435 
436 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
437 {
438         struct inode *new = NULL;
439         int status = 0;
440         int i;
441 
442         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
443         if (IS_ERR(new)) {
444                 status = PTR_ERR(new);
445                 mlog_errno(status);
446                 goto bail;
447         }
448         osb->root_inode = new;
449 
450         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
451         if (IS_ERR(new)) {
452                 status = PTR_ERR(new);
453                 mlog_errno(status);
454                 goto bail;
455         }
456         osb->sys_root_inode = new;
457 
458         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
459              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
460                 if (!ocfs2_need_system_inode(osb, i))
461                         continue;
462                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
463                 if (!new) {
464                         ocfs2_release_system_inodes(osb);
465                         status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
466                         mlog_errno(status);
467                         mlog(ML_ERROR, "Unable to load system inode %d, "
468                              "possibly corrupt fs?", i);
469                         goto bail;
470                 }
471                 // the array now has one ref, so drop this one
472                 iput(new);
473         }
474 
475 bail:
476         if (status)
477                 mlog_errno(status);
478         return status;
479 }
480 
481 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
482 {
483         struct inode *new = NULL;
484         int status = 0;
485         int i;
486 
487         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
488              i < NUM_SYSTEM_INODES;
489              i++) {
490                 if (!ocfs2_need_system_inode(osb, i))
491                         continue;
492                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
493                 if (!new) {
494                         ocfs2_release_system_inodes(osb);
495                         status = ocfs2_is_soft_readonly(osb) ? -EROFS : -EINVAL;
496                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
497                              status, i, osb->slot_num);
498                         goto bail;
499                 }
500                 /* the array now has one ref, so drop this one */
501                 iput(new);
502         }
503 
504 bail:
505         if (status)
506                 mlog_errno(status);
507         return status;
508 }
509 
510 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
511 {
512         int i;
513         struct inode *inode;
514 
515         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
516                 inode = osb->global_system_inodes[i];
517                 if (inode) {
518                         iput(inode);
519                         osb->global_system_inodes[i] = NULL;
520                 }
521         }
522 
523         inode = osb->sys_root_inode;
524         if (inode) {
525                 iput(inode);
526                 osb->sys_root_inode = NULL;
527         }
528 
529         inode = osb->root_inode;
530         if (inode) {
531                 iput(inode);
532                 osb->root_inode = NULL;
533         }
534 
535         if (!osb->local_system_inodes)
536                 return;
537 
538         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
539                 if (osb->local_system_inodes[i]) {
540                         iput(osb->local_system_inodes[i]);
541                         osb->local_system_inodes[i] = NULL;
542                 }
543         }
544 
545         kfree(osb->local_system_inodes);
546         osb->local_system_inodes = NULL;
547 }
548 
549 /* We're allocating fs objects, use GFP_NOFS */
550 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
551 {
552         struct ocfs2_inode_info *oi;
553 
554         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
555         if (!oi)
556                 return NULL;
557 
558         oi->i_sync_tid = 0;
559         oi->i_datasync_tid = 0;
560         memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));
561 
562         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
563         return &oi->vfs_inode;
564 }
565 
566 static void ocfs2_free_inode(struct inode *inode)
567 {
568         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
569 }
570 
571 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
572                                                 unsigned int cbits)
573 {
574         unsigned int bytes = 1 << cbits;
575         unsigned int trim = bytes;
576         unsigned int bitshift = 32;
577 
578         /*
579          * i_size and all block offsets in ocfs2 are always 64 bits
580          * wide. i_clusters is 32 bits, in cluster-sized units. So on
581          * 64 bit platforms, cluster size will be the limiting factor.
582          */
583 
584 #if BITS_PER_LONG == 32
585         BUILD_BUG_ON(sizeof(sector_t) != 8);
586         /*
587          * We might be limited by page cache size.
588          */
589         if (bytes > PAGE_SIZE) {
590                 bytes = PAGE_SIZE;
591                 trim = 1;
592                 /*
593                  * Shift by 31 here so that we don't get larger than
594                  * MAX_LFS_FILESIZE
595                  */
596                 bitshift = 31;
597         }
598 #endif
599 
600         /*
601          * Trim by a whole cluster when we can actually approach the
602          * on-disk limits. Otherwise we can overflow i_clusters when
603          * an extent start is at the max offset.
604          */
605         return (((unsigned long long)bytes) << bitshift) - trim;
606 }
607 
608 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
609 {
610         int incompat_features;
611         int ret = 0;
612         struct mount_options parsed_options;
613         struct ocfs2_super *osb = OCFS2_SB(sb);
614         u32 tmp;
615 
616         sync_filesystem(sb);
617 
618         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
619             !ocfs2_check_set_options(sb, &parsed_options)) {
620                 ret = -EINVAL;
621                 goto out;
622         }
623 
624         tmp = OCFS2_MOUNT_NOCLUSTER;
625         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
626                 ret = -EINVAL;
627                 mlog(ML_ERROR, "Cannot change nocluster option on remount\n");
628                 goto out;
629         }
630 
631         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
632                 OCFS2_MOUNT_HB_NONE;
633         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
634                 ret = -EINVAL;
635                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
636                 goto out;
637         }
638 
639         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
640             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
641                 ret = -EINVAL;
642                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
643                 goto out;
644         }
645 
646         /* Probably don't want this on remount; it might
647          * mess with other nodes */
648         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
649             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
650                 ret = -EINVAL;
651                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
652                 goto out;
653         }
654 
655         /* We're going to/from readonly mode. */
656         if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
657                 /* Disable quota accounting before remounting RO */
658                 if (*flags & SB_RDONLY) {
659                         ret = ocfs2_susp_quotas(osb, 0);
660                         if (ret < 0)
661                                 goto out;
662                 }
663                 /* Lock here so the check of HARD_RO and the potential
664                  * setting of SOFT_RO is atomic. */
665                 spin_lock(&osb->osb_lock);
666                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
667                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
668                         ret = -EROFS;
669                         goto unlock_osb;
670                 }
671 
672                 if (*flags & SB_RDONLY) {
673                         sb->s_flags |= SB_RDONLY;
674                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
675                 } else {
676                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
677                                 mlog(ML_ERROR, "Cannot remount RDWR "
678                                      "filesystem due to previous errors.\n");
679                                 ret = -EROFS;
680                                 goto unlock_osb;
681                         }
682                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
683                         if (incompat_features) {
684                                 mlog(ML_ERROR, "Cannot remount RDWR because "
685                                      "of unsupported optional features "
686                                      "(%x).\n", incompat_features);
687                                 ret = -EINVAL;
688                                 goto unlock_osb;
689                         }
690                         sb->s_flags &= ~SB_RDONLY;
691                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
692                 }
693                 trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
694 unlock_osb:
695                 spin_unlock(&osb->osb_lock);
696                 /* Enable quota accounting after remounting RW */
697                 if (!ret && !(*flags & SB_RDONLY)) {
698                         if (sb_any_quota_suspended(sb))
699                                 ret = ocfs2_susp_quotas(osb, 1);
700                         else
701                                 ret = ocfs2_enable_quotas(osb);
702                         if (ret < 0) {
703                                 /* Return back changes... */
704                                 spin_lock(&osb->osb_lock);
705                                 sb->s_flags |= SB_RDONLY;
706                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
707                                 spin_unlock(&osb->osb_lock);
708                                 goto out;
709                         }
710                 }
711         }
712 
713         if (!ret) {
714                 /* Only save off the new mount options in case of a successful
715                  * remount. */
716                 osb->s_mount_opt = parsed_options.mount_opt;
717                 osb->s_atime_quantum = parsed_options.atime_quantum;
718                 osb->preferred_slot = parsed_options.slot;
719                 if (parsed_options.commit_interval)
720                         osb->osb_commit_interval = parsed_options.commit_interval;
721 
722                 if (!ocfs2_is_hard_readonly(osb))
723                         ocfs2_set_journal_params(osb);
724 
725                 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
726                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
727                                                         SB_POSIXACL : 0);
728         }
729 out:
730         return ret;
731 }
732 
733 static int ocfs2_sb_probe(struct super_block *sb,
734                           struct buffer_head **bh,
735                           int *sector_size,
736                           struct ocfs2_blockcheck_stats *stats)
737 {
738         int status, tmpstat;
739         struct ocfs1_vol_disk_hdr *hdr;
740         struct ocfs2_dinode *di;
741         int blksize;
742 
743         *bh = NULL;
744 
745         /* may be > 512 */
746         *sector_size = bdev_logical_block_size(sb->s_bdev);
747         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
748                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
749                      *sector_size, OCFS2_MAX_BLOCKSIZE);
750                 status = -EINVAL;
751                 goto bail;
752         }
753 
754         /* Can this really happen? */
755         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
756                 *sector_size = OCFS2_MIN_BLOCKSIZE;
757 
758         /* check block zero for old format */
759         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
760         if (status < 0) {
761                 mlog_errno(status);
762                 goto bail;
763         }
764         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
765         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
766                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
767                      hdr->major_version, hdr->minor_version);
768                 status = -EINVAL;
769         }
770         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
771                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
772                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
773                      hdr->signature);
774                 status = -EINVAL;
775         }
776         brelse(*bh);
777         *bh = NULL;
778         if (status < 0) {
779                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
780                      "upgraded before mounting with ocfs v2\n");
781                 goto bail;
782         }
783 
784         /*
785          * Now check at magic offset for 512, 1024, 2048, 4096
786          * blocksizes.  4096 is the maximum blocksize because it is
787          * the minimum clustersize.
788          */
789         status = -EINVAL;
790         for (blksize = *sector_size;
791              blksize <= OCFS2_MAX_BLOCKSIZE;
792              blksize <<= 1) {
793                 tmpstat = ocfs2_get_sector(sb, bh,
794                                            OCFS2_SUPER_BLOCK_BLKNO,
795                                            blksize);
796                 if (tmpstat < 0) {
797                         status = tmpstat;
798                         mlog_errno(status);
799                         break;
800                 }
801                 di = (struct ocfs2_dinode *) (*bh)->b_data;
802                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
803                 spin_lock_init(&stats->b_lock);
804                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
805                 if (tmpstat < 0) {
806                         brelse(*bh);
807                         *bh = NULL;
808                 }
809                 if (tmpstat != -EAGAIN) {
810                         status = tmpstat;
811                         break;
812                 }
813         }
814 
815 bail:
816         return status;
817 }
818 
819 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
820 {
821         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
822 
823         if (osb->s_mount_opt & hb_enabled) {
824                 if (ocfs2_mount_local(osb)) {
825                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
826                              "mounted device.\n");
827                         return -EINVAL;
828                 }
829                 if (ocfs2_userspace_stack(osb)) {
830                         mlog(ML_ERROR, "Userspace stack expected, but "
831                              "o2cb heartbeat arguments passed to mount\n");
832                         return -EINVAL;
833                 }
834                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
835                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
836                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
837                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
838                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
839                         return -EINVAL;
840                 }
841         }
842 
843         if (!(osb->s_mount_opt & hb_enabled)) {
844                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
845                     !ocfs2_userspace_stack(osb)) {
846                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
847                              "a read-write clustered device.\n");
848                         return -EINVAL;
849                 }
850         }
851 
852         return 0;
853 }
854 
855 /*
856  * If we're using a userspace stack, mount should have passed
857  * a name that matches the disk.  If not, mount should not
858  * have passed a stack.
859  */
860 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
861                                         struct mount_options *mopt)
862 {
863         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
864                 mlog(ML_ERROR,
865                      "cluster stack passed to mount, but this filesystem "
866                      "does not support it\n");
867                 return -EINVAL;
868         }
869 
870         if (ocfs2_userspace_stack(osb) &&
871             !(osb->s_mount_opt & OCFS2_MOUNT_NOCLUSTER) &&
872             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
873                     OCFS2_STACK_LABEL_LEN)) {
874                 mlog(ML_ERROR,
875                      "cluster stack passed to mount (\"%s\") does not "
876                      "match the filesystem (\"%s\")\n",
877                      mopt->cluster_stack,
878                      osb->osb_cluster_stack);
879                 return -EINVAL;
880         }
881 
882         return 0;
883 }
884 
885 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
886 {
887         int type;
888         struct super_block *sb = osb->sb;
889         unsigned int feature[OCFS2_MAXQUOTAS] = {
890                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
891                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
892         int status = 0;
893 
894         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
895                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
896                         continue;
897                 if (unsuspend)
898                         status = dquot_resume(sb, type);
899                 else {
900                         struct ocfs2_mem_dqinfo *oinfo;
901 
902                         /* Cancel periodic syncing before suspending */
903                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
904                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
905                         status = dquot_suspend(sb, type);
906                 }
907                 if (status < 0)
908                         break;
909         }
910         if (status < 0)
911                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
912                      "remount (error = %d).\n", status);
913         return status;
914 }
915 
916 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
917 {
918         struct inode *inode[OCFS2_MAXQUOTAS] = { NULL, NULL };
919         struct super_block *sb = osb->sb;
920         unsigned int feature[OCFS2_MAXQUOTAS] = {
921                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
922                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
923         unsigned int ino[OCFS2_MAXQUOTAS] = {
924                                         LOCAL_USER_QUOTA_SYSTEM_INODE,
925                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
926         int status;
927         int type;
928 
929         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
930         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
931                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
932                         continue;
933                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
934                                                         osb->slot_num);
935                 if (!inode[type]) {
936                         status = -ENOENT;
937                         goto out_quota_off;
938                 }
939                 status = dquot_load_quota_inode(inode[type], type, QFMT_OCFS2,
940                                                 DQUOT_USAGE_ENABLED);
941                 if (status < 0)
942                         goto out_quota_off;
943         }
944 
945         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
946                 iput(inode[type]);
947         return 0;
948 out_quota_off:
949         ocfs2_disable_quotas(osb);
950         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
951                 iput(inode[type]);
952         mlog_errno(status);
953         return status;
954 }
955 
956 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
957 {
958         int type;
959         struct inode *inode;
960         struct super_block *sb = osb->sb;
961         struct ocfs2_mem_dqinfo *oinfo;
962 
963         /* We mostly ignore errors in this function because there's not much
964          * we can do when we see them */
965         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
966                 if (!sb_has_quota_loaded(sb, type))
967                         continue;
968                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
969                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
970                 inode = igrab(sb->s_dquot.files[type]);
971                 /* Turn off quotas. This will remove all dquot structures from
972                  * memory and so they will be automatically synced to global
973                  * quota files */
974                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
975                                         DQUOT_LIMITS_ENABLED);
976                 if (!inode)
977                         continue;
978                 iput(inode);
979         }
980 }
981 
982 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
983 {
984         struct dentry *root;
985         int status, sector_size;
986         struct mount_options parsed_options;
987         struct inode *inode = NULL;
988         struct ocfs2_super *osb = NULL;
989         struct buffer_head *bh = NULL;
990         char nodestr[12];
991         struct ocfs2_blockcheck_stats stats;
992 
993         trace_ocfs2_fill_super(sb, data, silent);
994 
995         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
996                 status = -EINVAL;
997                 goto read_super_error;
998         }
999 
1000         /* probe for superblock */
1001         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1002         if (status < 0) {
1003                 mlog(ML_ERROR, "superblock probe failed!\n");
1004                 goto read_super_error;
1005         }
1006 
1007         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1008         osb = OCFS2_SB(sb);
1009         if (status < 0) {
1010                 mlog_errno(status);
1011                 goto read_super_error;
1012         }
1013         brelse(bh);
1014         bh = NULL;
1015 
1016         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1017                 status = -EINVAL;
1018                 goto read_super_error;
1019         }
1020         osb->s_mount_opt = parsed_options.mount_opt;
1021         osb->s_atime_quantum = parsed_options.atime_quantum;
1022         osb->preferred_slot = parsed_options.slot;
1023         osb->osb_commit_interval = parsed_options.commit_interval;
1024 
1025         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1026         osb->osb_resv_level = parsed_options.resv_level;
1027         osb->osb_dir_resv_level = parsed_options.resv_level;
1028         if (parsed_options.dir_resv_level == -1)
1029                 osb->osb_dir_resv_level = parsed_options.resv_level;
1030         else
1031                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1032 
1033         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1034         if (status)
1035                 goto read_super_error;
1036 
1037         sb->s_magic = OCFS2_SUPER_MAGIC;
1038 
1039         sb->s_flags = (sb->s_flags & ~(SB_POSIXACL | SB_NOSEC)) |
1040                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0);
1041 
1042         /* Hard readonly mode only if: bdev_read_only, SB_RDONLY,
1043          * heartbeat=none */
1044         if (bdev_read_only(sb->s_bdev)) {
1045                 if (!sb_rdonly(sb)) {
1046                         status = -EACCES;
1047                         mlog(ML_ERROR, "Readonly device detected but readonly "
1048                              "mount was not specified.\n");
1049                         goto read_super_error;
1050                 }
1051 
1052                 /* You should not be able to start a local heartbeat
1053                  * on a readonly device. */
1054                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1055                         status = -EROFS;
1056                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1057                              "device.\n");
1058                         goto read_super_error;
1059                 }
1060 
1061                 status = ocfs2_check_journals_nolocks(osb);
1062                 if (status < 0) {
1063                         if (status == -EROFS)
1064                                 mlog(ML_ERROR, "Recovery required on readonly "
1065                                      "file system, but write access is "
1066                                      "unavailable.\n");
1067                         else
1068                                 mlog_errno(status);
1069                         goto read_super_error;
1070                 }
1071 
1072                 ocfs2_set_ro_flag(osb, 1);
1073 
1074                 printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1075                        "Cluster services will not be used for this mount. "
1076                        "Recovery will be skipped.\n", osb->dev_str);
1077         }
1078 
1079         if (!ocfs2_is_hard_readonly(osb)) {
1080                 if (sb_rdonly(sb))
1081                         ocfs2_set_ro_flag(osb, 0);
1082         }
1083 
1084         status = ocfs2_verify_heartbeat(osb);
1085         if (status < 0) {
1086                 mlog_errno(status);
1087                 goto read_super_error;
1088         }
1089 
1090         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1091                                                  ocfs2_debugfs_root);
1092 
1093         debugfs_create_file("fs_state", S_IFREG|S_IRUSR, osb->osb_debug_root,
1094                             osb, &ocfs2_osb_debug_fops);
1095 
1096         if (ocfs2_meta_ecc(osb))
1097                 ocfs2_blockcheck_stats_debugfs_install( &osb->osb_ecc_stats,
1098                                                         osb->osb_debug_root);
1099 
1100         status = ocfs2_mount_volume(sb);
1101         if (status < 0)
1102                 goto read_super_error;
1103 
1104         if (osb->root_inode)
1105                 inode = igrab(osb->root_inode);
1106 
1107         if (!inode) {
1108                 status = -EIO;
1109                 mlog_errno(status);
1110                 goto read_super_error;
1111         }
1112 
1113         root = d_make_root(inode);
1114         if (!root) {
1115                 status = -ENOMEM;
1116                 mlog_errno(status);
1117                 goto read_super_error;
1118         }
1119 
1120         sb->s_root = root;
1121 
1122         ocfs2_complete_mount_recovery(osb);
1123 
1124         osb->osb_dev_kset = kset_create_and_add(sb->s_id, NULL,
1125                                                 &ocfs2_kset->kobj);
1126         if (!osb->osb_dev_kset) {
1127                 status = -ENOMEM;
1128                 mlog(ML_ERROR, "Unable to create device kset %s.\n", sb->s_id);
1129                 goto read_super_error;
1130         }
1131 
1132         /* Create filecheck sysfs related directories/files at
1133          * /sys/fs/ocfs2/<devname>/filecheck */
1134         if (ocfs2_filecheck_create_sysfs(osb)) {
1135                 status = -ENOMEM;
1136                 mlog(ML_ERROR, "Unable to create filecheck sysfs directory at "
1137                         "/sys/fs/ocfs2/%s/filecheck.\n", sb->s_id);
1138                 goto read_super_error;
1139         }
1140 
1141         if (ocfs2_mount_local(osb))
1142                 snprintf(nodestr, sizeof(nodestr), "local");
1143         else
1144                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1145 
1146         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1147                "with %s data mode.\n",
1148                osb->dev_str, nodestr, osb->slot_num,
1149                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1150                "ordered");
1151 
1152         if ((osb->s_mount_opt & OCFS2_MOUNT_NOCLUSTER) &&
1153            !(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT))
1154                 printk(KERN_NOTICE "ocfs2: The shared device (%s) is mounted "
1155                        "without cluster aware mode.\n", osb->dev_str);
1156 
1157         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1158         wake_up(&osb->osb_mount_event);
1159 
1160         /* Now we can initialize quotas because we can afford to wait
1161          * for cluster locks recovery now. That also means that truncation
1162          * log recovery can happen but that waits for proper quota setup */
1163         if (!sb_rdonly(sb)) {
1164                 status = ocfs2_enable_quotas(osb);
1165                 if (status < 0) {
1166                         /* We have to err-out specially here because
1167                          * s_root is already set */
1168                         mlog_errno(status);
1169                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1170                         wake_up(&osb->osb_mount_event);
1171                         return status;
1172                 }
1173         }
1174 
1175         ocfs2_complete_quota_recovery(osb);
1176 
1177         /* Now we wake up again for processes waiting for quotas */
1178         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1179         wake_up(&osb->osb_mount_event);
1180 
1181         /* Start this when the mount is almost sure of being successful */
1182         ocfs2_orphan_scan_start(osb);
1183 
1184         return status;
1185 
1186 read_super_error:
1187         brelse(bh);
1188 
1189         if (status)
1190                 mlog_errno(status);
1191 
1192         if (osb) {
1193                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1194                 wake_up(&osb->osb_mount_event);
1195                 ocfs2_dismount_volume(sb, 1);
1196         }
1197 
1198         return status;
1199 }
1200 
1201 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1202                         int flags,
1203                         const char *dev_name,
1204                         void *data)
1205 {
1206         return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1207 }
1208 
1209 static struct file_system_type ocfs2_fs_type = {
1210         .owner          = THIS_MODULE,
1211         .name           = "ocfs2",
1212         .mount          = ocfs2_mount,
1213         .kill_sb        = kill_block_super,
1214         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1215         .next           = NULL
1216 };
1217 MODULE_ALIAS_FS("ocfs2");
1218 
1219 static int ocfs2_check_set_options(struct super_block *sb,
1220                                    struct mount_options *options)
1221 {
1222         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1223             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1224                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1225                 mlog(ML_ERROR, "User quotas were requested, but this "
1226                      "filesystem does not have the feature enabled.\n");
1227                 return 0;
1228         }
1229         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1230             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1231                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1232                 mlog(ML_ERROR, "Group quotas were requested, but this "
1233                      "filesystem does not have the feature enabled.\n");
1234                 return 0;
1235         }
1236         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1237             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1238                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1239                      "feature is not enabled\n");
1240                 return 0;
1241         }
1242         /* No ACL setting specified? Use XATTR feature... */
1243         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1244                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1245                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1246                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1247                 else
1248                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1249         }
1250         return 1;
1251 }
1252 
1253 static int ocfs2_parse_options(struct super_block *sb,
1254                                char *options,
1255                                struct mount_options *mopt,
1256                                int is_remount)
1257 {
1258         int status, user_stack = 0;
1259         char *p;
1260         u32 tmp;
1261         int token, option;
1262         substring_t args[MAX_OPT_ARGS];
1263 
1264         trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1265 
1266         mopt->commit_interval = 0;
1267         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1268         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1269         mopt->slot = OCFS2_INVALID_SLOT;
1270         mopt->localalloc_opt = -1;
1271         mopt->cluster_stack[0] = '\0';
1272         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1273         mopt->dir_resv_level = -1;
1274 
1275         if (!options) {
1276                 status = 1;
1277                 goto bail;
1278         }
1279 
1280         while ((p = strsep(&options, ",")) != NULL) {
1281                 if (!*p)
1282                         continue;
1283 
1284                 token = match_token(p, tokens, args);
1285                 switch (token) {
1286                 case Opt_hb_local:
1287                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1288                         break;
1289                 case Opt_hb_none:
1290                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1291                         break;
1292                 case Opt_hb_global:
1293                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1294                         break;
1295                 case Opt_barrier:
1296                         if (match_int(&args[0], &option)) {
1297                                 status = 0;
1298                                 goto bail;
1299                         }
1300                         if (option)
1301                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1302                         else
1303                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1304                         break;
1305                 case Opt_intr:
1306                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1307                         break;
1308                 case Opt_nointr:
1309                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1310                         break;
1311                 case Opt_err_panic:
1312                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1313                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1314                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1315                         break;
1316                 case Opt_err_ro:
1317                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1318                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1319                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
1320                         break;
1321                 case Opt_err_cont:
1322                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1323                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1324                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
1325                         break;
1326                 case Opt_data_ordered:
1327                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1328                         break;
1329                 case Opt_data_writeback:
1330                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1331                         break;
1332                 case Opt_user_xattr:
1333                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1334                         break;
1335                 case Opt_nouser_xattr:
1336                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1337                         break;
1338                 case Opt_atime_quantum:
1339                         if (match_int(&args[0], &option)) {
1340                                 status = 0;
1341                                 goto bail;
1342                         }
1343                         if (option >= 0)
1344                                 mopt->atime_quantum = option;
1345                         break;
1346                 case Opt_slot:
1347                         if (match_int(&args[0], &option)) {
1348                                 status = 0;
1349                                 goto bail;
1350                         }
1351                         if (option)
1352                                 mopt->slot = (s16)option;
1353                         break;
1354                 case Opt_commit:
1355                         if (match_int(&args[0], &option)) {
1356                                 status = 0;
1357                                 goto bail;
1358                         }
1359                         if (option < 0)
1360                                 return 0;
1361                         if (option == 0)
1362                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1363                         mopt->commit_interval = HZ * option;
1364                         break;
1365                 case Opt_localalloc:
1366                         if (match_int(&args[0], &option)) {
1367                                 status = 0;
1368                                 goto bail;
1369                         }
1370                         if (option >= 0)
1371                                 mopt->localalloc_opt = option;
1372                         break;
1373                 case Opt_localflocks:
1374                         /*
1375                          * Changing this during remount could race
1376                          * flock() requests, or "unbalance" existing
1377                          * ones (e.g., a lock is taken in one mode but
1378                          * dropped in the other). If users care enough
1379                          * to flip locking modes during remount, we
1380                          * could add a "local" flag to individual
1381                          * flock structures for proper tracking of
1382                          * state.
1383                          */
1384                         if (!is_remount)
1385                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1386                         break;
1387                 case Opt_stack:
1388                         /* Check both that the option we were passed
1389                          * is of the right length and that it is a proper
1390                          * string of the right length.
1391                          */
1392                         if (((args[0].to - args[0].from) !=
1393                              OCFS2_STACK_LABEL_LEN) ||
1394                             (strnlen(args[0].from,
1395                                      OCFS2_STACK_LABEL_LEN) !=
1396                              OCFS2_STACK_LABEL_LEN)) {
1397                                 mlog(ML_ERROR,
1398                                      "Invalid cluster_stack option\n");
1399                                 status = 0;
1400                                 goto bail;
1401                         }
1402                         memcpy(mopt->cluster_stack, args[0].from,
1403                                OCFS2_STACK_LABEL_LEN);
1404                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1405                         /*
1406                          * Open code the memcmp here as we don't have
1407                          * an osb to pass to
1408                          * ocfs2_userspace_stack().
1409                          */
1410                         if (memcmp(mopt->cluster_stack,
1411                                    OCFS2_CLASSIC_CLUSTER_STACK,
1412                                    OCFS2_STACK_LABEL_LEN))
1413                                 user_stack = 1;
1414                         break;
1415                 case Opt_inode64:
1416                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1417                         break;
1418                 case Opt_usrquota:
1419                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1420                         break;
1421                 case Opt_grpquota:
1422                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1423                         break;
1424                 case Opt_coherency_buffered:
1425                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1426                         break;
1427                 case Opt_coherency_full:
1428                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1429                         break;
1430                 case Opt_acl:
1431                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1432                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1433                         break;
1434                 case Opt_noacl:
1435                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1436                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1437                         break;
1438                 case Opt_resv_level:
1439                         if (is_remount)
1440                                 break;
1441                         if (match_int(&args[0], &option)) {
1442                                 status = 0;
1443                                 goto bail;
1444                         }
1445                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1446                             option < OCFS2_MAX_RESV_LEVEL)
1447                                 mopt->resv_level = option;
1448                         break;
1449                 case Opt_dir_resv_level:
1450                         if (is_remount)
1451                                 break;
1452                         if (match_int(&args[0], &option)) {
1453                                 status = 0;
1454                                 goto bail;
1455                         }
1456                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1457                             option < OCFS2_MAX_RESV_LEVEL)
1458                                 mopt->dir_resv_level = option;
1459                         break;
1460                 case Opt_journal_async_commit:
1461                         mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
1462                         break;
1463                 case Opt_nocluster:
1464                         mopt->mount_opt |= OCFS2_MOUNT_NOCLUSTER;
1465                         break;
1466                 default:
1467                         mlog(ML_ERROR,
1468                              "Unrecognized mount option \"%s\" "
1469                              "or missing value\n", p);
1470                         status = 0;
1471                         goto bail;
1472                 }
1473         }
1474 
1475         if (user_stack == 0) {
1476                 /* Ensure only one heartbeat mode */
1477                 tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1478                                          OCFS2_MOUNT_HB_GLOBAL |
1479                                          OCFS2_MOUNT_HB_NONE);
1480                 if (hweight32(tmp) != 1) {
1481                         mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1482                         status = 0;
1483                         goto bail;
1484                 }
1485         }
1486 
1487         status = 1;
1488 
1489 bail:
1490         return status;
1491 }
1492 
1493 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1494 {
1495         struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1496         unsigned long opts = osb->s_mount_opt;
1497         unsigned int local_alloc_megs;
1498 
1499         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1500                 seq_printf(s, ",_netdev");
1501                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1502                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1503                 else
1504                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1505         } else
1506                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1507 
1508         if (opts & OCFS2_MOUNT_NOINTR)
1509                 seq_printf(s, ",nointr");
1510 
1511         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1512                 seq_printf(s, ",data=writeback");
1513         else
1514                 seq_printf(s, ",data=ordered");
1515 
1516         if (opts & OCFS2_MOUNT_BARRIER)
1517                 seq_printf(s, ",barrier=1");
1518 
1519         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1520                 seq_printf(s, ",errors=panic");
1521         else if (opts & OCFS2_MOUNT_ERRORS_CONT)
1522                 seq_printf(s, ",errors=continue");
1523         else
1524                 seq_printf(s, ",errors=remount-ro");
1525 
1526         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1527                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1528 
1529         seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1530 
1531         if (osb->osb_commit_interval)
1532                 seq_printf(s, ",commit=%u",
1533                            (unsigned) (osb->osb_commit_interval / HZ));
1534 
1535         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1536         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1537                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1538 
1539         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1540                 seq_printf(s, ",localflocks,");
1541 
1542         if (osb->osb_cluster_stack[0])
1543                 seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
1544                                   OCFS2_STACK_LABEL_LEN);
1545         if (opts & OCFS2_MOUNT_USRQUOTA)
1546                 seq_printf(s, ",usrquota");
1547         if (opts & OCFS2_MOUNT_GRPQUOTA)
1548                 seq_printf(s, ",grpquota");
1549 
1550         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1551                 seq_printf(s, ",coherency=buffered");
1552         else
1553                 seq_printf(s, ",coherency=full");
1554 
1555         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1556                 seq_printf(s, ",nouser_xattr");
1557         else
1558                 seq_printf(s, ",user_xattr");
1559 
1560         if (opts & OCFS2_MOUNT_INODE64)
1561                 seq_printf(s, ",inode64");
1562 
1563         if (opts & OCFS2_MOUNT_POSIX_ACL)
1564                 seq_printf(s, ",acl");
1565         else
1566                 seq_printf(s, ",noacl");
1567 
1568         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1569                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1570 
1571         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1572                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1573 
1574         if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
1575                 seq_printf(s, ",journal_async_commit");
1576 
1577         if (opts & OCFS2_MOUNT_NOCLUSTER)
1578                 seq_printf(s, ",nocluster");
1579 
1580         return 0;
1581 }
1582 
1583 static int __init ocfs2_init(void)
1584 {
1585         int status;
1586 
1587         status = init_ocfs2_uptodate_cache();
1588         if (status < 0)
1589                 goto out1;
1590 
1591         status = ocfs2_initialize_mem_caches();
1592         if (status < 0)
1593                 goto out2;
1594 
1595         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1596 
1597         ocfs2_set_locking_protocol();
1598 
1599         status = register_quota_format(&ocfs2_quota_format);
1600         if (status < 0)
1601                 goto out3;
1602         status = register_filesystem(&ocfs2_fs_type);
1603         if (!status)
1604                 return 0;
1605 
1606         unregister_quota_format(&ocfs2_quota_format);
1607 out3:
1608         debugfs_remove(ocfs2_debugfs_root);
1609         ocfs2_free_mem_caches();
1610 out2:
1611         exit_ocfs2_uptodate_cache();
1612 out1:
1613         mlog_errno(status);
1614         return status;
1615 }
1616 
1617 static void __exit ocfs2_exit(void)
1618 {
1619         unregister_quota_format(&ocfs2_quota_format);
1620 
1621         debugfs_remove(ocfs2_debugfs_root);
1622 
1623         ocfs2_free_mem_caches();
1624 
1625         unregister_filesystem(&ocfs2_fs_type);
1626 
1627         exit_ocfs2_uptodate_cache();
1628 }
1629 
1630 static void ocfs2_put_super(struct super_block *sb)
1631 {
1632         trace_ocfs2_put_super(sb);
1633 
1634         ocfs2_sync_blockdev(sb);
1635         ocfs2_dismount_volume(sb, 0);
1636 }
1637 
1638 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1639 {
1640         struct ocfs2_super *osb;
1641         u32 numbits, freebits;
1642         int status;
1643         struct ocfs2_dinode *bm_lock;
1644         struct buffer_head *bh = NULL;
1645         struct inode *inode = NULL;
1646 
1647         trace_ocfs2_statfs(dentry->d_sb, buf);
1648 
1649         osb = OCFS2_SB(dentry->d_sb);
1650 
1651         inode = ocfs2_get_system_file_inode(osb,
1652                                             GLOBAL_BITMAP_SYSTEM_INODE,
1653                                             OCFS2_INVALID_SLOT);
1654         if (!inode) {
1655                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1656                 status = -EIO;
1657                 goto bail;
1658         }
1659 
1660         status = ocfs2_inode_lock(inode, &bh, 0);
1661         if (status < 0) {
1662                 mlog_errno(status);
1663                 goto bail;
1664         }
1665 
1666         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1667 
1668         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1669         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1670 
1671         buf->f_type = OCFS2_SUPER_MAGIC;
1672         buf->f_bsize = dentry->d_sb->s_blocksize;
1673         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1674         buf->f_blocks = ((sector_t) numbits) *
1675                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1676         buf->f_bfree = ((sector_t) freebits) *
1677                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1678         buf->f_bavail = buf->f_bfree;
1679         buf->f_files = numbits;
1680         buf->f_ffree = freebits;
1681         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1682                                 & 0xFFFFFFFFUL;
1683         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1684                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1685 
1686         brelse(bh);
1687 
1688         ocfs2_inode_unlock(inode, 0);
1689         status = 0;
1690 bail:
1691         iput(inode);
1692 
1693         if (status)
1694                 mlog_errno(status);
1695 
1696         return status;
1697 }
1698 
1699 static void ocfs2_inode_init_once(void *data)
1700 {
1701         struct ocfs2_inode_info *oi = data;
1702 
1703         oi->ip_flags = 0;
1704         oi->ip_open_count = 0;
1705         spin_lock_init(&oi->ip_lock);
1706         ocfs2_extent_map_init(&oi->vfs_inode);
1707         INIT_LIST_HEAD(&oi->ip_io_markers);
1708         INIT_LIST_HEAD(&oi->ip_unwritten_list);
1709         oi->ip_dir_start_lookup = 0;
1710         init_rwsem(&oi->ip_alloc_sem);
1711         init_rwsem(&oi->ip_xattr_sem);
1712         mutex_init(&oi->ip_io_mutex);
1713 
1714         oi->ip_blkno = 0ULL;
1715         oi->ip_clusters = 0;
1716 
1717         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1718 
1719         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1720         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1721         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1722 
1723         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1724                                   &ocfs2_inode_caching_ops);
1725 
1726         inode_init_once(&oi->vfs_inode);
1727 }
1728 
1729 static int ocfs2_initialize_mem_caches(void)
1730 {
1731         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1732                                        sizeof(struct ocfs2_inode_info),
1733                                        0,
1734                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1735                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1736                                        ocfs2_inode_init_once);
1737         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1738                                         sizeof(struct ocfs2_dquot),
1739                                         0,
1740                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1741                                                 SLAB_MEM_SPREAD),
1742                                         NULL);
1743         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1744                                         sizeof(struct ocfs2_quota_chunk),
1745                                         0,
1746                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1747                                         NULL);
1748         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1749             !ocfs2_qf_chunk_cachep) {
1750                 kmem_cache_destroy(ocfs2_inode_cachep);
1751                 kmem_cache_destroy(ocfs2_dquot_cachep);
1752                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1753                 return -ENOMEM;
1754         }
1755 
1756         return 0;
1757 }
1758 
1759 static void ocfs2_free_mem_caches(void)
1760 {
1761         /*
1762          * Make sure all delayed rcu free inodes are flushed before we
1763          * destroy cache.
1764          */
1765         rcu_barrier();
1766         kmem_cache_destroy(ocfs2_inode_cachep);
1767         ocfs2_inode_cachep = NULL;
1768 
1769         kmem_cache_destroy(ocfs2_dquot_cachep);
1770         ocfs2_dquot_cachep = NULL;
1771 
1772         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1773         ocfs2_qf_chunk_cachep = NULL;
1774 }
1775 
1776 static int ocfs2_get_sector(struct super_block *sb,
1777                             struct buffer_head **bh,
1778                             int block,
1779                             int sect_size)
1780 {
1781         if (!sb_set_blocksize(sb, sect_size)) {
1782                 mlog(ML_ERROR, "unable to set blocksize\n");
1783                 return -EIO;
1784         }
1785 
1786         *bh = sb_getblk(sb, block);
1787         if (!*bh) {
1788                 mlog_errno(-ENOMEM);
1789                 return -ENOMEM;
1790         }
1791         lock_buffer(*bh);
1792         if (!buffer_dirty(*bh))
1793                 clear_buffer_uptodate(*bh);
1794         unlock_buffer(*bh);
1795         ll_rw_block(REQ_OP_READ, 0, 1, bh);
1796         wait_on_buffer(*bh);
1797         if (!buffer_uptodate(*bh)) {
1798                 mlog_errno(-EIO);
1799                 brelse(*bh);
1800                 *bh = NULL;
1801                 return -EIO;
1802         }
1803 
1804         return 0;
1805 }
1806 
1807 static int ocfs2_mount_volume(struct super_block *sb)
1808 {
1809         int status = 0;
1810         int unlock_super = 0;
1811         struct ocfs2_super *osb = OCFS2_SB(sb);
1812 
1813         if (ocfs2_is_hard_readonly(osb))
1814                 goto leave;
1815 
1816         mutex_init(&osb->obs_trim_fs_mutex);
1817 
1818         status = ocfs2_dlm_init(osb);
1819         if (status < 0) {
1820                 mlog_errno(status);
1821                 if (status == -EBADR && ocfs2_userspace_stack(osb))
1822                         mlog(ML_ERROR, "couldn't mount because cluster name on"
1823                         " disk does not match the running cluster name.\n");
1824                 goto leave;
1825         }
1826 
1827         status = ocfs2_super_lock(osb, 1);
1828         if (status < 0) {
1829                 mlog_errno(status);
1830                 goto leave;
1831         }
1832         unlock_super = 1;
1833 
1834         /* This will load up the node map and add ourselves to it. */
1835         status = ocfs2_find_slot(osb);
1836         if (status < 0) {
1837                 mlog_errno(status);
1838                 goto leave;
1839         }
1840 
1841         /* load all node-local system inodes */
1842         status = ocfs2_init_local_system_inodes(osb);
1843         if (status < 0) {
1844                 mlog_errno(status);
1845                 goto leave;
1846         }
1847 
1848         status = ocfs2_check_volume(osb);
1849         if (status < 0) {
1850                 mlog_errno(status);
1851                 goto leave;
1852         }
1853 
1854         status = ocfs2_truncate_log_init(osb);
1855         if (status < 0)
1856                 mlog_errno(status);
1857 
1858 leave:
1859         if (unlock_super)
1860                 ocfs2_super_unlock(osb, 1);
1861 
1862         return status;
1863 }
1864 
1865 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1866 {
1867         int tmp, hangup_needed = 0;
1868         struct ocfs2_super *osb = NULL;
1869         char nodestr[12];
1870 
1871         trace_ocfs2_dismount_volume(sb);
1872 
1873         BUG_ON(!sb);
1874         osb = OCFS2_SB(sb);
1875         BUG_ON(!osb);
1876 
1877         /* Remove file check sysfs related directores/files,
1878          * and wait for the pending file check operations */
1879         ocfs2_filecheck_remove_sysfs(osb);
1880 
1881         kset_unregister(osb->osb_dev_kset);
1882 
1883         /* Orphan scan should be stopped as early as possible */
1884         ocfs2_orphan_scan_stop(osb);
1885 
1886         ocfs2_disable_quotas(osb);
1887 
1888         /* All dquots should be freed by now */
1889         WARN_ON(!llist_empty(&osb->dquot_drop_list));
1890         /* Wait for worker to be done with the work structure in osb */
1891         cancel_work_sync(&osb->dquot_drop_work);
1892 
1893         ocfs2_shutdown_local_alloc(osb);
1894 
1895         ocfs2_truncate_log_shutdown(osb);
1896 
1897         /* This will disable recovery and flush any recovery work. */
1898         ocfs2_recovery_exit(osb);
1899 
1900         ocfs2_journal_shutdown(osb);
1901 
1902         ocfs2_sync_blockdev(sb);
1903 
1904         ocfs2_purge_refcount_trees(osb);
1905 
1906         /* No cluster connection means we've failed during mount, so skip
1907          * all the steps which depended on that to complete. */
1908         if (osb->cconn) {
1909                 tmp = ocfs2_super_lock(osb, 1);
1910                 if (tmp < 0) {
1911                         mlog_errno(tmp);
1912                         return;
1913                 }
1914         }
1915 
1916         if (osb->slot_num != OCFS2_INVALID_SLOT)
1917                 ocfs2_put_slot(osb);
1918 
1919         if (osb->cconn)
1920                 ocfs2_super_unlock(osb, 1);
1921 
1922         ocfs2_release_system_inodes(osb);
1923 
1924         /*
1925          * If we're dismounting due to mount error, mount.ocfs2 will clean
1926          * up heartbeat.  If we're a local mount, there is no heartbeat.
1927          * If we failed before we got a uuid_str yet, we can't stop
1928          * heartbeat.  Otherwise, do it.
1929          */
1930         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1931             !ocfs2_is_hard_readonly(osb))
1932                 hangup_needed = 1;
1933 
1934         if (osb->cconn)
1935                 ocfs2_dlm_shutdown(osb, hangup_needed);
1936 
1937         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1938         debugfs_remove_recursive(osb->osb_debug_root);
1939 
1940         if (hangup_needed)
1941                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1942 
1943         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1944 
1945         if (ocfs2_mount_local(osb))
1946                 snprintf(nodestr, sizeof(nodestr), "local");
1947         else
1948                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1949 
1950         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1951                osb->dev_str, nodestr);
1952 
1953         ocfs2_delete_osb(osb);
1954         kfree(osb);
1955         sb->s_dev = 0;
1956         sb->s_fs_info = NULL;
1957 }
1958 
1959 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1960                                 unsigned uuid_bytes)
1961 {
1962         int i, ret;
1963         char *ptr;
1964 
1965         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1966 
1967         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1968         if (osb->uuid_str == NULL)
1969                 return -ENOMEM;
1970 
1971         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1972                 /* print with null */
1973                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1974                 if (ret != 2) /* drop super cleans up */
1975                         return -EINVAL;
1976                 /* then only advance past the last char */
1977                 ptr += 2;
1978         }
1979 
1980         return 0;
1981 }
1982 
1983 /* Make sure entire volume is addressable by our journal.  Requires
1984    osb_clusters_at_boot to be valid and for the journal to have been
1985    initialized by ocfs2_journal_init(). */
1986 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
1987 {
1988         int status = 0;
1989         u64 max_block =
1990                 ocfs2_clusters_to_blocks(osb->sb,
1991                                          osb->osb_clusters_at_boot) - 1;
1992 
1993         /* 32-bit block number is always OK. */
1994         if (max_block <= (u32)~0ULL)
1995                 goto out;
1996 
1997         /* Volume is "huge", so see if our journal is new enough to
1998            support it. */
1999         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2000                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2001               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2002                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2003                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2004                      "Enable the 'block64' journal option with tunefs.ocfs2");
2005                 status = -EFBIG;
2006                 goto out;
2007         }
2008 
2009  out:
2010         return status;
2011 }
2012 
2013 static int ocfs2_initialize_super(struct super_block *sb,
2014                                   struct buffer_head *bh,
2015                                   int sector_size,
2016                                   struct ocfs2_blockcheck_stats *stats)
2017 {
2018         int status;
2019         int i, cbits, bbits;
2020         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2021         struct inode *inode = NULL;
2022         struct ocfs2_journal *journal;
2023         struct ocfs2_super *osb;
2024         u64 total_blocks;
2025 
2026         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2027         if (!osb) {
2028                 status = -ENOMEM;
2029                 mlog_errno(status);
2030                 goto bail;
2031         }
2032 
2033         sb->s_fs_info = osb;
2034         sb->s_op = &ocfs2_sops;
2035         sb->s_d_op = &ocfs2_dentry_ops;
2036         sb->s_export_op = &ocfs2_export_ops;
2037         sb->s_qcop = &dquot_quotactl_sysfile_ops;
2038         sb->dq_op = &ocfs2_quota_operations;
2039         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2040         sb->s_xattr = ocfs2_xattr_handlers;
2041         sb->s_time_gran = 1;
2042         sb->s_flags |= SB_NOATIME;
2043         /* this is needed to support O_LARGEFILE */
2044         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2045         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2046         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2047         memcpy(&sb->s_uuid, di->id2.i_super.s_uuid,
2048                sizeof(di->id2.i_super.s_uuid));
2049 
2050         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2051 
2052         for (i = 0; i < 3; i++)
2053                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2054         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2055 
2056         osb->sb = sb;
2057         osb->s_sectsize_bits = blksize_bits(sector_size);
2058         BUG_ON(!osb->s_sectsize_bits);
2059 
2060         spin_lock_init(&osb->dc_task_lock);
2061         init_waitqueue_head(&osb->dc_event);
2062         osb->dc_work_sequence = 0;
2063         osb->dc_wake_sequence = 0;
2064         INIT_LIST_HEAD(&osb->blocked_lock_list);
2065         osb->blocked_lock_count = 0;
2066         spin_lock_init(&osb->osb_lock);
2067         spin_lock_init(&osb->osb_xattr_lock);
2068         ocfs2_init_steal_slots(osb);
2069 
2070         mutex_init(&osb->system_file_mutex);
2071 
2072         atomic_set(&osb->alloc_stats.moves, 0);
2073         atomic_set(&osb->alloc_stats.local_data, 0);
2074         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2075         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2076         atomic_set(&osb->alloc_stats.bg_extends, 0);
2077 
2078         /* Copy the blockcheck stats from the superblock probe */
2079         osb->osb_ecc_stats = *stats;
2080 
2081         ocfs2_init_node_maps(osb);
2082 
2083         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2084                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2085 
2086         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2087         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2088                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2089                      osb->max_slots);
2090                 status = -EINVAL;
2091                 goto bail;
2092         }
2093 
2094         ocfs2_orphan_scan_init(osb);
2095 
2096         status = ocfs2_recovery_init(osb);
2097         if (status) {
2098                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2099                 mlog_errno(status);
2100                 goto bail;
2101         }
2102 
2103         init_waitqueue_head(&osb->checkpoint_event);
2104 
2105         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2106 
2107         osb->slot_num = OCFS2_INVALID_SLOT;
2108 
2109         osb->s_xattr_inline_size = le16_to_cpu(
2110                                         di->id2.i_super.s_xattr_inline_size);
2111 
2112         osb->local_alloc_state = OCFS2_LA_UNUSED;
2113         osb->local_alloc_bh = NULL;
2114         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2115 
2116         init_waitqueue_head(&osb->osb_mount_event);
2117 
2118         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2119         if (status) {
2120                 mlog_errno(status);
2121                 goto bail;
2122         }
2123 
2124         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2125         if (!osb->vol_label) {
2126                 mlog(ML_ERROR, "unable to alloc vol label\n");
2127                 status = -ENOMEM;
2128                 goto bail;
2129         }
2130 
2131         osb->slot_recovery_generations =
2132                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2133                         GFP_KERNEL);
2134         if (!osb->slot_recovery_generations) {
2135                 status = -ENOMEM;
2136                 mlog_errno(status);
2137                 goto bail;
2138         }
2139 
2140         init_waitqueue_head(&osb->osb_wipe_event);
2141         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2142                                         sizeof(*osb->osb_orphan_wipes),
2143                                         GFP_KERNEL);
2144         if (!osb->osb_orphan_wipes) {
2145                 status = -ENOMEM;
2146                 mlog_errno(status);
2147                 goto bail;
2148         }
2149 
2150         osb->osb_rf_lock_tree = RB_ROOT;
2151 
2152         osb->s_feature_compat =
2153                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2154         osb->s_feature_ro_compat =
2155                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2156         osb->s_feature_incompat =
2157                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2158 
2159         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2160                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2161                      "optional features (%x).\n", i);
2162                 status = -EINVAL;
2163                 goto bail;
2164         }
2165         if (!sb_rdonly(osb->sb) && (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2166                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2167                      "unsupported optional features (%x).\n", i);
2168                 status = -EINVAL;
2169                 goto bail;
2170         }
2171 
2172         if (ocfs2_clusterinfo_valid(osb)) {
2173                 osb->osb_stackflags =
2174                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2175                 strlcpy(osb->osb_cluster_stack,
2176                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2177                        OCFS2_STACK_LABEL_LEN + 1);
2178                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2179                         mlog(ML_ERROR,
2180                              "couldn't mount because of an invalid "
2181                              "cluster stack label (%s) \n",
2182                              osb->osb_cluster_stack);
2183                         status = -EINVAL;
2184                         goto bail;
2185                 }
2186                 strlcpy(osb->osb_cluster_name,
2187                         OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
2188                         OCFS2_CLUSTER_NAME_LEN + 1);
2189         } else {
2190                 /* The empty string is identical with classic tools that
2191                  * don't know about s_cluster_info. */
2192                 osb->osb_cluster_stack[0] = '\0';
2193         }
2194 
2195         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2196 
2197         /* FIXME
2198          * This should be done in ocfs2_journal_init(), but unknown
2199          * ordering issues will cause the filesystem to crash.
2200          * If anyone wants to figure out what part of the code
2201          * refers to osb->journal before ocfs2_journal_init() is run,
2202          * be my guest.
2203          */
2204         /* initialize our journal structure */
2205 
2206         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2207         if (!journal) {
2208                 mlog(ML_ERROR, "unable to alloc journal\n");
2209                 status = -ENOMEM;
2210                 goto bail;
2211         }
2212         osb->journal = journal;
2213         journal->j_osb = osb;
2214 
2215         atomic_set(&journal->j_num_trans, 0);
2216         init_rwsem(&journal->j_trans_barrier);
2217         init_waitqueue_head(&journal->j_checkpointed);
2218         spin_lock_init(&journal->j_lock);
2219         journal->j_trans_id = (unsigned long) 1;
2220         INIT_LIST_HEAD(&journal->j_la_cleanups);
2221         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2222         journal->j_state = OCFS2_JOURNAL_FREE;
2223 
2224         INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
2225         init_llist_head(&osb->dquot_drop_list);
2226 
2227         /* get some pseudo constants for clustersize bits */
2228         osb->s_clustersize_bits =
2229                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2230         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2231 
2232         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2233             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2234                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2235                      osb->s_clustersize);
2236                 status = -EINVAL;
2237                 goto bail;
2238         }
2239 
2240         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2241                                                 le32_to_cpu(di->i_clusters));
2242 
2243         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2244                                            total_blocks);
2245         if (status) {
2246                 mlog(ML_ERROR, "Volume too large "
2247                      "to mount safely on this system");
2248                 status = -EFBIG;
2249                 goto bail;
2250         }
2251 
2252         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2253                                  sizeof(di->id2.i_super.s_uuid))) {
2254                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2255                 status = -ENOMEM;
2256                 goto bail;
2257         }
2258 
2259         strlcpy(osb->vol_label, di->id2.i_super.s_label,
2260                 OCFS2_MAX_VOL_LABEL_LEN);
2261         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2262         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2263         osb->first_cluster_group_blkno =
2264                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2265         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2266         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2267         trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2268                                      (unsigned long long)osb->root_blkno,
2269                                      (unsigned long long)osb->system_dir_blkno,
2270                                      osb->s_clustersize_bits);
2271 
2272         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2273         if (!osb->osb_dlm_debug) {
2274                 status = -ENOMEM;
2275                 mlog_errno(status);
2276                 goto bail;
2277         }
2278 
2279         atomic_set(&osb->vol_state, VOLUME_INIT);
2280 
2281         /* load root, system_dir, and all global system inodes */
2282         status = ocfs2_init_global_system_inodes(osb);
2283         if (status < 0) {
2284                 mlog_errno(status);
2285                 goto bail;
2286         }
2287 
2288         /*
2289          * global bitmap
2290          */
2291         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2292                                             OCFS2_INVALID_SLOT);
2293         if (!inode) {
2294                 status = -EINVAL;
2295                 mlog_errno(status);
2296                 goto bail;
2297         }
2298 
2299         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2300         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2301         iput(inode);
2302 
2303         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2304                                  osb->s_feature_incompat) * 8;
2305 
2306         status = ocfs2_init_slot_info(osb);
2307         if (status < 0) {
2308                 mlog_errno(status);
2309                 goto bail;
2310         }
2311         cleancache_init_shared_fs(sb);
2312 
2313         osb->ocfs2_wq = alloc_ordered_workqueue("ocfs2_wq", WQ_MEM_RECLAIM);
2314         if (!osb->ocfs2_wq) {
2315                 status = -ENOMEM;
2316                 mlog_errno(status);
2317         }
2318 
2319 bail:
2320         return status;
2321 }
2322 
2323 /*
2324  * will return: -EAGAIN if it is ok to keep searching for superblocks
2325  *              -EINVAL if there is a bad superblock
2326  *              0 on success
2327  */
2328 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2329                                struct buffer_head *bh,
2330                                u32 blksz,
2331                                struct ocfs2_blockcheck_stats *stats)
2332 {
2333         int status = -EAGAIN;
2334 
2335         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2336                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2337                 /* We have to do a raw check of the feature here */
2338                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2339                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2340                         status = ocfs2_block_check_validate(bh->b_data,
2341                                                             bh->b_size,
2342                                                             &di->i_check,
2343                                                             stats);
2344                         if (status)
2345                                 goto out;
2346                 }
2347                 status = -EINVAL;
2348                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2349                         mlog(ML_ERROR, "found superblock with incorrect block "
2350                              "size: found %u, should be %u\n",
2351                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2352                                blksz);
2353                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2354                            OCFS2_MAJOR_REV_LEVEL ||
2355                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2356                            OCFS2_MINOR_REV_LEVEL) {
2357                         mlog(ML_ERROR, "found superblock with bad version: "
2358                              "found %u.%u, should be %u.%u\n",
2359                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2360                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2361                              OCFS2_MAJOR_REV_LEVEL,
2362                              OCFS2_MINOR_REV_LEVEL);
2363                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2364                         mlog(ML_ERROR, "bad block number on superblock: "
2365                              "found %llu, should be %llu\n",
2366                              (unsigned long long)le64_to_cpu(di->i_blkno),
2367                              (unsigned long long)bh->b_blocknr);
2368                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2369                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2370                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2371                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2372                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2373                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2374                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2375                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2376                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2377                         mlog(ML_ERROR,
2378                              "Superblock slots found greater than file system "
2379                              "maximum: found %u, max %u\n",
2380                              le16_to_cpu(di->id2.i_super.s_max_slots),
2381                              OCFS2_MAX_SLOTS);
2382                 } else {
2383                         /* found it! */
2384                         status = 0;
2385                 }
2386         }
2387 
2388 out:
2389         if (status && status != -EAGAIN)
2390                 mlog_errno(status);
2391         return status;
2392 }
2393 
2394 static int ocfs2_check_volume(struct ocfs2_super *osb)
2395 {
2396         int status;
2397         int dirty;
2398         int local;
2399         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2400                                                   * recover
2401                                                   * ourselves. */
2402 
2403         /* Init our journal object. */
2404         status = ocfs2_journal_init(osb->journal, &dirty);
2405         if (status < 0) {
2406                 mlog(ML_ERROR, "Could not initialize journal!\n");
2407                 goto finally;
2408         }
2409 
2410         /* Now that journal has been initialized, check to make sure
2411            entire volume is addressable. */
2412         status = ocfs2_journal_addressable(osb);
2413         if (status)
2414                 goto finally;
2415 
2416         /* If the journal was unmounted cleanly then we don't want to
2417          * recover anything. Otherwise, journal_load will do that
2418          * dirty work for us :) */
2419         if (!dirty) {
2420                 status = ocfs2_journal_wipe(osb->journal, 0);
2421                 if (status < 0) {
2422                         mlog_errno(status);
2423                         goto finally;
2424                 }
2425         } else {
2426                 printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2427                        "unmounted cleanly, recovering it.\n", osb->dev_str);
2428         }
2429 
2430         local = ocfs2_mount_local(osb);
2431 
2432         /* will play back anything left in the journal. */
2433         status = ocfs2_journal_load(osb->journal, local, dirty);
2434         if (status < 0) {
2435                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2436                 goto finally;
2437         }
2438 
2439         if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
2440                 jbd2_journal_set_features(osb->journal->j_journal,
2441                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2442                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2443         else
2444                 jbd2_journal_clear_features(osb->journal->j_journal,
2445                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2446                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2447 
2448         if (dirty) {
2449                 /* recover my local alloc if we didn't unmount cleanly. */
2450                 status = ocfs2_begin_local_alloc_recovery(osb,
2451                                                           osb->slot_num,
2452                                                           &local_alloc);
2453                 if (status < 0) {
2454                         mlog_errno(status);
2455                         goto finally;
2456                 }
2457                 /* we complete the recovery process after we've marked
2458                  * ourselves as mounted. */
2459         }
2460 
2461         status = ocfs2_load_local_alloc(osb);
2462         if (status < 0) {
2463                 mlog_errno(status);
2464                 goto finally;
2465         }
2466 
2467         if (dirty) {
2468                 /* Recovery will be completed after we've mounted the
2469                  * rest of the volume. */
2470                 osb->local_alloc_copy = local_alloc;
2471                 local_alloc = NULL;
2472         }
2473 
2474         /* go through each journal, trylock it and if you get the
2475          * lock, and it's marked as dirty, set the bit in the recover
2476          * map and launch a recovery thread for it. */
2477         status = ocfs2_mark_dead_nodes(osb);
2478         if (status < 0) {
2479                 mlog_errno(status);
2480                 goto finally;
2481         }
2482 
2483         status = ocfs2_compute_replay_slots(osb);
2484         if (status < 0)
2485                 mlog_errno(status);
2486 
2487 finally:
2488         kfree(local_alloc);
2489 
2490         if (status)
2491                 mlog_errno(status);
2492         return status;
2493 }
2494 
2495 /*
2496  * The routine gets called from dismount or close whenever a dismount on
2497  * volume is requested and the osb open count becomes 1.
2498  * It will remove the osb from the global list and also free up all the
2499  * initialized resources and fileobject.
2500  */
2501 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2502 {
2503         /* This function assumes that the caller has the main osb resource */
2504 
2505         /* ocfs2_initializer_super have already created this workqueue */
2506         if (osb->ocfs2_wq)
2507                 destroy_workqueue(osb->ocfs2_wq);
2508 
2509         ocfs2_free_slot_info(osb);
2510 
2511         kfree(osb->osb_orphan_wipes);
2512         kfree(osb->slot_recovery_generations);
2513         /* FIXME
2514          * This belongs in journal shutdown, but because we have to
2515          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2516          * we free it here.
2517          */
2518         kfree(osb->journal);
2519         kfree(osb->local_alloc_copy);
2520         kfree(osb->uuid_str);
2521         kfree(osb->vol_label);
2522         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2523         memset(osb, 0, sizeof(struct ocfs2_super));
2524 }
2525 
2526 /* Depending on the mount option passed, perform one of the following:
2527  * Put OCFS2 into a readonly state (default)
2528  * Return EIO so that only the process errs
2529  * Fix the error as if fsck.ocfs2 -y
2530  * panic
2531  */
2532 static int ocfs2_handle_error(struct super_block *sb)
2533 {
2534         struct ocfs2_super *osb = OCFS2_SB(sb);
2535         int rv = 0;
2536 
2537         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2538         pr_crit("On-disk corruption discovered. "
2539                 "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
2540 
2541         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
2542                 panic("OCFS2: (device %s): panic forced after error\n",
2543                       sb->s_id);
2544         } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
2545                 pr_crit("OCFS2: Returning error to the calling process.\n");
2546                 rv = -EIO;
2547         } else { /* default option */
2548                 rv = -EROFS;
2549                 if (sb_rdonly(sb) && (ocfs2_is_soft_readonly(osb) || ocfs2_is_hard_readonly(osb)))
2550                         return rv;
2551 
2552                 pr_crit("OCFS2: File system is now read-only.\n");
2553                 sb->s_flags |= SB_RDONLY;
2554                 ocfs2_set_ro_flag(osb, 0);
2555         }
2556 
2557         return rv;
2558 }
2559 
2560 int __ocfs2_error(struct super_block *sb, const char *function,
2561                   const char *fmt, ...)
2562 {
2563         struct va_format vaf;
2564         va_list args;
2565 
2566         va_start(args, fmt);
2567         vaf.fmt = fmt;
2568         vaf.va = &args;
2569 
2570         /* Not using mlog here because we want to show the actual
2571          * function the error came from. */
2572         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %pV",
2573                sb->s_id, function, &vaf);
2574 
2575         va_end(args);
2576 
2577         return ocfs2_handle_error(sb);
2578 }
2579 
2580 /* Handle critical errors. This is intentionally more drastic than
2581  * ocfs2_handle_error, so we only use for things like journal errors,
2582  * etc. */
2583 void __ocfs2_abort(struct super_block *sb, const char *function,
2584                    const char *fmt, ...)
2585 {
2586         struct va_format vaf;
2587         va_list args;
2588 
2589         va_start(args, fmt);
2590 
2591         vaf.fmt = fmt;
2592         vaf.va = &args;
2593 
2594         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
2595                sb->s_id, function, &vaf);
2596 
2597         va_end(args);
2598 
2599         /* We don't have the cluster support yet to go straight to
2600          * hard readonly in here. Until then, we want to keep
2601          * ocfs2_abort() so that we can at least mark critical
2602          * errors.
2603          *
2604          * TODO: This should abort the journal and alert other nodes
2605          * that our slot needs recovery. */
2606 
2607         /* Force a panic(). This stinks, but it's better than letting
2608          * things continue without having a proper hard readonly
2609          * here. */
2610         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2611                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2612         ocfs2_handle_error(sb);
2613 }
2614 
2615 /*
2616  * Void signal blockers, because in-kernel sigprocmask() only fails
2617  * when SIG_* is wrong.
2618  */
2619 void ocfs2_block_signals(sigset_t *oldset)
2620 {
2621         int rc;
2622         sigset_t blocked;
2623 
2624         sigfillset(&blocked);
2625         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2626         BUG_ON(rc);
2627 }
2628 
2629 void ocfs2_unblock_signals(sigset_t *oldset)
2630 {
2631         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2632         BUG_ON(rc);
2633 }
2634 
2635 module_init(ocfs2_init);
2636 module_exit(ocfs2_exit);
2637 

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