Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/fs/ocfs2/super.c

  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * super.c
  5  *
  6  * load/unload driver, mount/dismount volumes
  7  *
  8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  */
 25 
 26 #include <linux/module.h>
 27 #include <linux/fs.h>
 28 #include <linux/types.h>
 29 #include <linux/slab.h>
 30 #include <linux/highmem.h>
 31 #include <linux/init.h>
 32 #include <linux/random.h>
 33 #include <linux/statfs.h>
 34 #include <linux/moduleparam.h>
 35 #include <linux/blkdev.h>
 36 #include <linux/socket.h>
 37 #include <linux/inet.h>
 38 #include <linux/parser.h>
 39 #include <linux/crc32.h>
 40 #include <linux/debugfs.h>
 41 #include <linux/mount.h>
 42 #include <linux/seq_file.h>
 43 #include <linux/quotaops.h>
 44 #include <linux/cleancache.h>
 45 
 46 #define CREATE_TRACE_POINTS
 47 #include "ocfs2_trace.h"
 48 
 49 #include <cluster/masklog.h>
 50 
 51 #include "ocfs2.h"
 52 
 53 /* this should be the only file to include a version 1 header */
 54 #include "ocfs1_fs_compat.h"
 55 
 56 #include "alloc.h"
 57 #include "aops.h"
 58 #include "blockcheck.h"
 59 #include "dlmglue.h"
 60 #include "export.h"
 61 #include "extent_map.h"
 62 #include "heartbeat.h"
 63 #include "inode.h"
 64 #include "journal.h"
 65 #include "localalloc.h"
 66 #include "namei.h"
 67 #include "slot_map.h"
 68 #include "super.h"
 69 #include "sysfile.h"
 70 #include "uptodate.h"
 71 #include "xattr.h"
 72 #include "quota.h"
 73 #include "refcounttree.h"
 74 #include "suballoc.h"
 75 
 76 #include "buffer_head_io.h"
 77 
 78 static struct kmem_cache *ocfs2_inode_cachep;
 79 struct kmem_cache *ocfs2_dquot_cachep;
 80 struct kmem_cache *ocfs2_qf_chunk_cachep;
 81 
 82 /* OCFS2 needs to schedule several different types of work which
 83  * require cluster locking, disk I/O, recovery waits, etc. Since these
 84  * types of work tend to be heavy we avoid using the kernel events
 85  * workqueue and schedule on our own. */
 86 struct workqueue_struct *ocfs2_wq = NULL;
 87 
 88 static struct dentry *ocfs2_debugfs_root;
 89 
 90 MODULE_AUTHOR("Oracle");
 91 MODULE_LICENSE("GPL");
 92 MODULE_DESCRIPTION("OCFS2 cluster file system");
 93 
 94 struct mount_options
 95 {
 96         unsigned long   commit_interval;
 97         unsigned long   mount_opt;
 98         unsigned int    atime_quantum;
 99         signed short    slot;
100         int             localalloc_opt;
101         unsigned int    resv_level;
102         int             dir_resv_level;
103         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
104 };
105 
106 static int ocfs2_parse_options(struct super_block *sb, char *options,
107                                struct mount_options *mopt,
108                                int is_remount);
109 static int ocfs2_check_set_options(struct super_block *sb,
110                                    struct mount_options *options);
111 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
112 static void ocfs2_put_super(struct super_block *sb);
113 static int ocfs2_mount_volume(struct super_block *sb);
114 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
115 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
116 static int ocfs2_initialize_mem_caches(void);
117 static void ocfs2_free_mem_caches(void);
118 static void ocfs2_delete_osb(struct ocfs2_super *osb);
119 
120 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
121 
122 static int ocfs2_sync_fs(struct super_block *sb, int wait);
123 
124 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
125 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
126 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
127 static int ocfs2_check_volume(struct ocfs2_super *osb);
128 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
129                                struct buffer_head *bh,
130                                u32 sectsize,
131                                struct ocfs2_blockcheck_stats *stats);
132 static int ocfs2_initialize_super(struct super_block *sb,
133                                   struct buffer_head *bh,
134                                   int sector_size,
135                                   struct ocfs2_blockcheck_stats *stats);
136 static int ocfs2_get_sector(struct super_block *sb,
137                             struct buffer_head **bh,
138                             int block,
139                             int sect_size);
140 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
141 static void ocfs2_destroy_inode(struct inode *inode);
142 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
143 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
144 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
145 
146 static struct dquot **ocfs2_get_dquots(struct inode *inode)
147 {
148         return OCFS2_I(inode)->i_dquot;
149 }
150 
151 static const struct super_operations ocfs2_sops = {
152         .statfs         = ocfs2_statfs,
153         .alloc_inode    = ocfs2_alloc_inode,
154         .destroy_inode  = ocfs2_destroy_inode,
155         .drop_inode     = ocfs2_drop_inode,
156         .evict_inode    = ocfs2_evict_inode,
157         .sync_fs        = ocfs2_sync_fs,
158         .put_super      = ocfs2_put_super,
159         .remount_fs     = ocfs2_remount,
160         .show_options   = ocfs2_show_options,
161         .quota_read     = ocfs2_quota_read,
162         .quota_write    = ocfs2_quota_write,
163         .get_dquots     = ocfs2_get_dquots,
164 };
165 
166 enum {
167         Opt_barrier,
168         Opt_err_panic,
169         Opt_err_ro,
170         Opt_intr,
171         Opt_nointr,
172         Opt_hb_none,
173         Opt_hb_local,
174         Opt_hb_global,
175         Opt_data_ordered,
176         Opt_data_writeback,
177         Opt_atime_quantum,
178         Opt_slot,
179         Opt_commit,
180         Opt_localalloc,
181         Opt_localflocks,
182         Opt_stack,
183         Opt_user_xattr,
184         Opt_nouser_xattr,
185         Opt_inode64,
186         Opt_acl,
187         Opt_noacl,
188         Opt_usrquota,
189         Opt_grpquota,
190         Opt_coherency_buffered,
191         Opt_coherency_full,
192         Opt_resv_level,
193         Opt_dir_resv_level,
194         Opt_journal_async_commit,
195         Opt_err_cont,
196         Opt_err,
197 };
198 
199 static const match_table_t tokens = {
200         {Opt_barrier, "barrier=%u"},
201         {Opt_err_panic, "errors=panic"},
202         {Opt_err_ro, "errors=remount-ro"},
203         {Opt_intr, "intr"},
204         {Opt_nointr, "nointr"},
205         {Opt_hb_none, OCFS2_HB_NONE},
206         {Opt_hb_local, OCFS2_HB_LOCAL},
207         {Opt_hb_global, OCFS2_HB_GLOBAL},
208         {Opt_data_ordered, "data=ordered"},
209         {Opt_data_writeback, "data=writeback"},
210         {Opt_atime_quantum, "atime_quantum=%u"},
211         {Opt_slot, "preferred_slot=%u"},
212         {Opt_commit, "commit=%u"},
213         {Opt_localalloc, "localalloc=%d"},
214         {Opt_localflocks, "localflocks"},
215         {Opt_stack, "cluster_stack=%s"},
216         {Opt_user_xattr, "user_xattr"},
217         {Opt_nouser_xattr, "nouser_xattr"},
218         {Opt_inode64, "inode64"},
219         {Opt_acl, "acl"},
220         {Opt_noacl, "noacl"},
221         {Opt_usrquota, "usrquota"},
222         {Opt_grpquota, "grpquota"},
223         {Opt_coherency_buffered, "coherency=buffered"},
224         {Opt_coherency_full, "coherency=full"},
225         {Opt_resv_level, "resv_level=%u"},
226         {Opt_dir_resv_level, "dir_resv_level=%u"},
227         {Opt_journal_async_commit, "journal_async_commit"},
228         {Opt_err_cont, "errors=continue"},
229         {Opt_err, NULL}
230 };
231 
232 #ifdef CONFIG_DEBUG_FS
233 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
234 {
235         struct ocfs2_cluster_connection *cconn = osb->cconn;
236         struct ocfs2_recovery_map *rm = osb->recovery_map;
237         struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
238         int i, out = 0;
239 
240         out += snprintf(buf + out, len - out,
241                         "%10s => Id: %-s  Uuid: %-s  Gen: 0x%X  Label: %-s\n",
242                         "Device", osb->dev_str, osb->uuid_str,
243                         osb->fs_generation, osb->vol_label);
244 
245         out += snprintf(buf + out, len - out,
246                         "%10s => State: %d  Flags: 0x%lX\n", "Volume",
247                         atomic_read(&osb->vol_state), osb->osb_flags);
248 
249         out += snprintf(buf + out, len - out,
250                         "%10s => Block: %lu  Cluster: %d\n", "Sizes",
251                         osb->sb->s_blocksize, osb->s_clustersize);
252 
253         out += snprintf(buf + out, len - out,
254                         "%10s => Compat: 0x%X  Incompat: 0x%X  "
255                         "ROcompat: 0x%X\n",
256                         "Features", osb->s_feature_compat,
257                         osb->s_feature_incompat, osb->s_feature_ro_compat);
258 
259         out += snprintf(buf + out, len - out,
260                         "%10s => Opts: 0x%lX  AtimeQuanta: %u\n", "Mount",
261                         osb->s_mount_opt, osb->s_atime_quantum);
262 
263         if (cconn) {
264                 out += snprintf(buf + out, len - out,
265                                 "%10s => Stack: %s  Name: %*s  "
266                                 "Version: %d.%d\n", "Cluster",
267                                 (*osb->osb_cluster_stack == '\0' ?
268                                  "o2cb" : osb->osb_cluster_stack),
269                                 cconn->cc_namelen, cconn->cc_name,
270                                 cconn->cc_version.pv_major,
271                                 cconn->cc_version.pv_minor);
272         }
273 
274         spin_lock(&osb->dc_task_lock);
275         out += snprintf(buf + out, len - out,
276                         "%10s => Pid: %d  Count: %lu  WakeSeq: %lu  "
277                         "WorkSeq: %lu\n", "DownCnvt",
278                         (osb->dc_task ?  task_pid_nr(osb->dc_task) : -1),
279                         osb->blocked_lock_count, osb->dc_wake_sequence,
280                         osb->dc_work_sequence);
281         spin_unlock(&osb->dc_task_lock);
282 
283         spin_lock(&osb->osb_lock);
284         out += snprintf(buf + out, len - out, "%10s => Pid: %d  Nodes:",
285                         "Recovery",
286                         (osb->recovery_thread_task ?
287                          task_pid_nr(osb->recovery_thread_task) : -1));
288         if (rm->rm_used == 0)
289                 out += snprintf(buf + out, len - out, " None\n");
290         else {
291                 for (i = 0; i < rm->rm_used; i++)
292                         out += snprintf(buf + out, len - out, " %d",
293                                         rm->rm_entries[i]);
294                 out += snprintf(buf + out, len - out, "\n");
295         }
296         spin_unlock(&osb->osb_lock);
297 
298         out += snprintf(buf + out, len - out,
299                         "%10s => Pid: %d  Interval: %lu\n", "Commit",
300                         (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
301                         osb->osb_commit_interval);
302 
303         out += snprintf(buf + out, len - out,
304                         "%10s => State: %d  TxnId: %lu  NumTxns: %d\n",
305                         "Journal", osb->journal->j_state,
306                         osb->journal->j_trans_id,
307                         atomic_read(&osb->journal->j_num_trans));
308 
309         out += snprintf(buf + out, len - out,
310                         "%10s => GlobalAllocs: %d  LocalAllocs: %d  "
311                         "SubAllocs: %d  LAWinMoves: %d  SAExtends: %d\n",
312                         "Stats",
313                         atomic_read(&osb->alloc_stats.bitmap_data),
314                         atomic_read(&osb->alloc_stats.local_data),
315                         atomic_read(&osb->alloc_stats.bg_allocs),
316                         atomic_read(&osb->alloc_stats.moves),
317                         atomic_read(&osb->alloc_stats.bg_extends));
318 
319         out += snprintf(buf + out, len - out,
320                         "%10s => State: %u  Descriptor: %llu  Size: %u bits  "
321                         "Default: %u bits\n",
322                         "LocalAlloc", osb->local_alloc_state,
323                         (unsigned long long)osb->la_last_gd,
324                         osb->local_alloc_bits, osb->local_alloc_default_bits);
325 
326         spin_lock(&osb->osb_lock);
327         out += snprintf(buf + out, len - out,
328                         "%10s => InodeSlot: %d  StolenInodes: %d, "
329                         "MetaSlot: %d  StolenMeta: %d\n", "Steal",
330                         osb->s_inode_steal_slot,
331                         atomic_read(&osb->s_num_inodes_stolen),
332                         osb->s_meta_steal_slot,
333                         atomic_read(&osb->s_num_meta_stolen));
334         spin_unlock(&osb->osb_lock);
335 
336         out += snprintf(buf + out, len - out, "OrphanScan => ");
337         out += snprintf(buf + out, len - out, "Local: %u  Global: %u ",
338                         os->os_count, os->os_seqno);
339         out += snprintf(buf + out, len - out, " Last Scan: ");
340         if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
341                 out += snprintf(buf + out, len - out, "Disabled\n");
342         else
343                 out += snprintf(buf + out, len - out, "%lu seconds ago\n",
344                                 (get_seconds() - os->os_scantime.tv_sec));
345 
346         out += snprintf(buf + out, len - out, "%10s => %3s  %10s\n",
347                         "Slots", "Num", "RecoGen");
348         for (i = 0; i < osb->max_slots; ++i) {
349                 out += snprintf(buf + out, len - out,
350                                 "%10s  %c %3d  %10d\n",
351                                 " ",
352                                 (i == osb->slot_num ? '*' : ' '),
353                                 i, osb->slot_recovery_generations[i]);
354         }
355 
356         return out;
357 }
358 
359 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
360 {
361         struct ocfs2_super *osb = inode->i_private;
362         char *buf = NULL;
363 
364         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
365         if (!buf)
366                 goto bail;
367 
368         i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
369 
370         file->private_data = buf;
371 
372         return 0;
373 bail:
374         return -ENOMEM;
375 }
376 
377 static int ocfs2_debug_release(struct inode *inode, struct file *file)
378 {
379         kfree(file->private_data);
380         return 0;
381 }
382 
383 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
384                                 size_t nbytes, loff_t *ppos)
385 {
386         return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
387                                        i_size_read(file->f_mapping->host));
388 }
389 #else
390 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
391 {
392         return 0;
393 }
394 static int ocfs2_debug_release(struct inode *inode, struct file *file)
395 {
396         return 0;
397 }
398 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
399                                 size_t nbytes, loff_t *ppos)
400 {
401         return 0;
402 }
403 #endif  /* CONFIG_DEBUG_FS */
404 
405 static const struct file_operations ocfs2_osb_debug_fops = {
406         .open =         ocfs2_osb_debug_open,
407         .release =      ocfs2_debug_release,
408         .read =         ocfs2_debug_read,
409         .llseek =       generic_file_llseek,
410 };
411 
412 static int ocfs2_sync_fs(struct super_block *sb, int wait)
413 {
414         int status;
415         tid_t target;
416         struct ocfs2_super *osb = OCFS2_SB(sb);
417 
418         if (ocfs2_is_hard_readonly(osb))
419                 return -EROFS;
420 
421         if (wait) {
422                 status = ocfs2_flush_truncate_log(osb);
423                 if (status < 0)
424                         mlog_errno(status);
425         } else {
426                 ocfs2_schedule_truncate_log_flush(osb, 0);
427         }
428 
429         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
430                                       &target)) {
431                 if (wait)
432                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
433                                              target);
434         }
435         return 0;
436 }
437 
438 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
439 {
440         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
441             && (ino == USER_QUOTA_SYSTEM_INODE
442                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
443                 return 0;
444         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
445             && (ino == GROUP_QUOTA_SYSTEM_INODE
446                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
447                 return 0;
448         return 1;
449 }
450 
451 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
452 {
453         struct inode *new = NULL;
454         int status = 0;
455         int i;
456 
457         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
458         if (IS_ERR(new)) {
459                 status = PTR_ERR(new);
460                 mlog_errno(status);
461                 goto bail;
462         }
463         osb->root_inode = new;
464 
465         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
466         if (IS_ERR(new)) {
467                 status = PTR_ERR(new);
468                 mlog_errno(status);
469                 goto bail;
470         }
471         osb->sys_root_inode = new;
472 
473         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
474              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
475                 if (!ocfs2_need_system_inode(osb, i))
476                         continue;
477                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
478                 if (!new) {
479                         ocfs2_release_system_inodes(osb);
480                         status = -EINVAL;
481                         mlog_errno(status);
482                         /* FIXME: Should ERROR_RO_FS */
483                         mlog(ML_ERROR, "Unable to load system inode %d, "
484                              "possibly corrupt fs?", i);
485                         goto bail;
486                 }
487                 // the array now has one ref, so drop this one
488                 iput(new);
489         }
490 
491 bail:
492         if (status)
493                 mlog_errno(status);
494         return status;
495 }
496 
497 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
498 {
499         struct inode *new = NULL;
500         int status = 0;
501         int i;
502 
503         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
504              i < NUM_SYSTEM_INODES;
505              i++) {
506                 if (!ocfs2_need_system_inode(osb, i))
507                         continue;
508                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
509                 if (!new) {
510                         ocfs2_release_system_inodes(osb);
511                         status = -EINVAL;
512                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
513                              status, i, osb->slot_num);
514                         goto bail;
515                 }
516                 /* the array now has one ref, so drop this one */
517                 iput(new);
518         }
519 
520 bail:
521         if (status)
522                 mlog_errno(status);
523         return status;
524 }
525 
526 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
527 {
528         int i;
529         struct inode *inode;
530 
531         for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
532                 inode = osb->global_system_inodes[i];
533                 if (inode) {
534                         iput(inode);
535                         osb->global_system_inodes[i] = NULL;
536                 }
537         }
538 
539         inode = osb->sys_root_inode;
540         if (inode) {
541                 iput(inode);
542                 osb->sys_root_inode = NULL;
543         }
544 
545         inode = osb->root_inode;
546         if (inode) {
547                 iput(inode);
548                 osb->root_inode = NULL;
549         }
550 
551         if (!osb->local_system_inodes)
552                 return;
553 
554         for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
555                 if (osb->local_system_inodes[i]) {
556                         iput(osb->local_system_inodes[i]);
557                         osb->local_system_inodes[i] = NULL;
558                 }
559         }
560 
561         kfree(osb->local_system_inodes);
562         osb->local_system_inodes = NULL;
563 }
564 
565 /* We're allocating fs objects, use GFP_NOFS */
566 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
567 {
568         struct ocfs2_inode_info *oi;
569 
570         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
571         if (!oi)
572                 return NULL;
573 
574         oi->i_sync_tid = 0;
575         oi->i_datasync_tid = 0;
576         memset(&oi->i_dquot, 0, sizeof(oi->i_dquot));
577 
578         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
579         return &oi->vfs_inode;
580 }
581 
582 static void ocfs2_i_callback(struct rcu_head *head)
583 {
584         struct inode *inode = container_of(head, struct inode, i_rcu);
585         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
586 }
587 
588 static void ocfs2_destroy_inode(struct inode *inode)
589 {
590         call_rcu(&inode->i_rcu, ocfs2_i_callback);
591 }
592 
593 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
594                                                 unsigned int cbits)
595 {
596         unsigned int bytes = 1 << cbits;
597         unsigned int trim = bytes;
598         unsigned int bitshift = 32;
599 
600         /*
601          * i_size and all block offsets in ocfs2 are always 64 bits
602          * wide. i_clusters is 32 bits, in cluster-sized units. So on
603          * 64 bit platforms, cluster size will be the limiting factor.
604          */
605 
606 #if BITS_PER_LONG == 32
607 # if defined(CONFIG_LBDAF)
608         BUILD_BUG_ON(sizeof(sector_t) != 8);
609         /*
610          * We might be limited by page cache size.
611          */
612         if (bytes > PAGE_CACHE_SIZE) {
613                 bytes = PAGE_CACHE_SIZE;
614                 trim = 1;
615                 /*
616                  * Shift by 31 here so that we don't get larger than
617                  * MAX_LFS_FILESIZE
618                  */
619                 bitshift = 31;
620         }
621 # else
622         /*
623          * We are limited by the size of sector_t. Use block size, as
624          * that's what we expose to the VFS.
625          */
626         bytes = 1 << bbits;
627         trim = 1;
628         bitshift = 31;
629 # endif
630 #endif
631 
632         /*
633          * Trim by a whole cluster when we can actually approach the
634          * on-disk limits. Otherwise we can overflow i_clusters when
635          * an extent start is at the max offset.
636          */
637         return (((unsigned long long)bytes) << bitshift) - trim;
638 }
639 
640 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
641 {
642         int incompat_features;
643         int ret = 0;
644         struct mount_options parsed_options;
645         struct ocfs2_super *osb = OCFS2_SB(sb);
646         u32 tmp;
647 
648         sync_filesystem(sb);
649 
650         if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
651             !ocfs2_check_set_options(sb, &parsed_options)) {
652                 ret = -EINVAL;
653                 goto out;
654         }
655 
656         tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
657                 OCFS2_MOUNT_HB_NONE;
658         if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
659                 ret = -EINVAL;
660                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
661                 goto out;
662         }
663 
664         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
665             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
666                 ret = -EINVAL;
667                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
668                 goto out;
669         }
670 
671         /* Probably don't want this on remount; it might
672          * mess with other nodes */
673         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
674             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
675                 ret = -EINVAL;
676                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
677                 goto out;
678         }
679 
680         /* We're going to/from readonly mode. */
681         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
682                 /* Disable quota accounting before remounting RO */
683                 if (*flags & MS_RDONLY) {
684                         ret = ocfs2_susp_quotas(osb, 0);
685                         if (ret < 0)
686                                 goto out;
687                 }
688                 /* Lock here so the check of HARD_RO and the potential
689                  * setting of SOFT_RO is atomic. */
690                 spin_lock(&osb->osb_lock);
691                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
692                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
693                         ret = -EROFS;
694                         goto unlock_osb;
695                 }
696 
697                 if (*flags & MS_RDONLY) {
698                         sb->s_flags |= MS_RDONLY;
699                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
700                 } else {
701                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
702                                 mlog(ML_ERROR, "Cannot remount RDWR "
703                                      "filesystem due to previous errors.\n");
704                                 ret = -EROFS;
705                                 goto unlock_osb;
706                         }
707                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
708                         if (incompat_features) {
709                                 mlog(ML_ERROR, "Cannot remount RDWR because "
710                                      "of unsupported optional features "
711                                      "(%x).\n", incompat_features);
712                                 ret = -EINVAL;
713                                 goto unlock_osb;
714                         }
715                         sb->s_flags &= ~MS_RDONLY;
716                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
717                 }
718                 trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
719 unlock_osb:
720                 spin_unlock(&osb->osb_lock);
721                 /* Enable quota accounting after remounting RW */
722                 if (!ret && !(*flags & MS_RDONLY)) {
723                         if (sb_any_quota_suspended(sb))
724                                 ret = ocfs2_susp_quotas(osb, 1);
725                         else
726                                 ret = ocfs2_enable_quotas(osb);
727                         if (ret < 0) {
728                                 /* Return back changes... */
729                                 spin_lock(&osb->osb_lock);
730                                 sb->s_flags |= MS_RDONLY;
731                                 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
732                                 spin_unlock(&osb->osb_lock);
733                                 goto out;
734                         }
735                 }
736         }
737 
738         if (!ret) {
739                 /* Only save off the new mount options in case of a successful
740                  * remount. */
741                 osb->s_mount_opt = parsed_options.mount_opt;
742                 osb->s_atime_quantum = parsed_options.atime_quantum;
743                 osb->preferred_slot = parsed_options.slot;
744                 if (parsed_options.commit_interval)
745                         osb->osb_commit_interval = parsed_options.commit_interval;
746 
747                 if (!ocfs2_is_hard_readonly(osb))
748                         ocfs2_set_journal_params(osb);
749 
750                 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
751                         ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
752                                                         MS_POSIXACL : 0);
753         }
754 out:
755         return ret;
756 }
757 
758 static int ocfs2_sb_probe(struct super_block *sb,
759                           struct buffer_head **bh,
760                           int *sector_size,
761                           struct ocfs2_blockcheck_stats *stats)
762 {
763         int status, tmpstat;
764         struct ocfs1_vol_disk_hdr *hdr;
765         struct ocfs2_dinode *di;
766         int blksize;
767 
768         *bh = NULL;
769 
770         /* may be > 512 */
771         *sector_size = bdev_logical_block_size(sb->s_bdev);
772         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
773                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
774                      *sector_size, OCFS2_MAX_BLOCKSIZE);
775                 status = -EINVAL;
776                 goto bail;
777         }
778 
779         /* Can this really happen? */
780         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
781                 *sector_size = OCFS2_MIN_BLOCKSIZE;
782 
783         /* check block zero for old format */
784         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
785         if (status < 0) {
786                 mlog_errno(status);
787                 goto bail;
788         }
789         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
790         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
791                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
792                      hdr->major_version, hdr->minor_version);
793                 status = -EINVAL;
794         }
795         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
796                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
797                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
798                      hdr->signature);
799                 status = -EINVAL;
800         }
801         brelse(*bh);
802         *bh = NULL;
803         if (status < 0) {
804                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
805                      "upgraded before mounting with ocfs v2\n");
806                 goto bail;
807         }
808 
809         /*
810          * Now check at magic offset for 512, 1024, 2048, 4096
811          * blocksizes.  4096 is the maximum blocksize because it is
812          * the minimum clustersize.
813          */
814         status = -EINVAL;
815         for (blksize = *sector_size;
816              blksize <= OCFS2_MAX_BLOCKSIZE;
817              blksize <<= 1) {
818                 tmpstat = ocfs2_get_sector(sb, bh,
819                                            OCFS2_SUPER_BLOCK_BLKNO,
820                                            blksize);
821                 if (tmpstat < 0) {
822                         status = tmpstat;
823                         mlog_errno(status);
824                         break;
825                 }
826                 di = (struct ocfs2_dinode *) (*bh)->b_data;
827                 memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
828                 spin_lock_init(&stats->b_lock);
829                 tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
830                 if (tmpstat < 0) {
831                         brelse(*bh);
832                         *bh = NULL;
833                 }
834                 if (tmpstat != -EAGAIN) {
835                         status = tmpstat;
836                         break;
837                 }
838         }
839 
840 bail:
841         return status;
842 }
843 
844 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
845 {
846         u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
847 
848         if (osb->s_mount_opt & hb_enabled) {
849                 if (ocfs2_mount_local(osb)) {
850                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
851                              "mounted device.\n");
852                         return -EINVAL;
853                 }
854                 if (ocfs2_userspace_stack(osb)) {
855                         mlog(ML_ERROR, "Userspace stack expected, but "
856                              "o2cb heartbeat arguments passed to mount\n");
857                         return -EINVAL;
858                 }
859                 if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
860                      !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
861                     ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
862                      ocfs2_cluster_o2cb_global_heartbeat(osb))) {
863                         mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
864                         return -EINVAL;
865                 }
866         }
867 
868         if (!(osb->s_mount_opt & hb_enabled)) {
869                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
870                     !ocfs2_userspace_stack(osb)) {
871                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
872                              "a read-write clustered device.\n");
873                         return -EINVAL;
874                 }
875         }
876 
877         return 0;
878 }
879 
880 /*
881  * If we're using a userspace stack, mount should have passed
882  * a name that matches the disk.  If not, mount should not
883  * have passed a stack.
884  */
885 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
886                                         struct mount_options *mopt)
887 {
888         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
889                 mlog(ML_ERROR,
890                      "cluster stack passed to mount, but this filesystem "
891                      "does not support it\n");
892                 return -EINVAL;
893         }
894 
895         if (ocfs2_userspace_stack(osb) &&
896             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
897                     OCFS2_STACK_LABEL_LEN)) {
898                 mlog(ML_ERROR,
899                      "cluster stack passed to mount (\"%s\") does not "
900                      "match the filesystem (\"%s\")\n",
901                      mopt->cluster_stack,
902                      osb->osb_cluster_stack);
903                 return -EINVAL;
904         }
905 
906         return 0;
907 }
908 
909 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
910 {
911         int type;
912         struct super_block *sb = osb->sb;
913         unsigned int feature[OCFS2_MAXQUOTAS] = {
914                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
915                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
916         int status = 0;
917 
918         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
919                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
920                         continue;
921                 if (unsuspend)
922                         status = dquot_resume(sb, type);
923                 else {
924                         struct ocfs2_mem_dqinfo *oinfo;
925 
926                         /* Cancel periodic syncing before suspending */
927                         oinfo = sb_dqinfo(sb, type)->dqi_priv;
928                         cancel_delayed_work_sync(&oinfo->dqi_sync_work);
929                         status = dquot_suspend(sb, type);
930                 }
931                 if (status < 0)
932                         break;
933         }
934         if (status < 0)
935                 mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
936                      "remount (error = %d).\n", status);
937         return status;
938 }
939 
940 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
941 {
942         struct inode *inode[OCFS2_MAXQUOTAS] = { NULL, NULL };
943         struct super_block *sb = osb->sb;
944         unsigned int feature[OCFS2_MAXQUOTAS] = {
945                                         OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
946                                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
947         unsigned int ino[OCFS2_MAXQUOTAS] = {
948                                         LOCAL_USER_QUOTA_SYSTEM_INODE,
949                                         LOCAL_GROUP_QUOTA_SYSTEM_INODE };
950         int status;
951         int type;
952 
953         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
954         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
955                 if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
956                         continue;
957                 inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
958                                                         osb->slot_num);
959                 if (!inode[type]) {
960                         status = -ENOENT;
961                         goto out_quota_off;
962                 }
963                 status = dquot_enable(inode[type], type, QFMT_OCFS2,
964                                       DQUOT_USAGE_ENABLED);
965                 if (status < 0)
966                         goto out_quota_off;
967         }
968 
969         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
970                 iput(inode[type]);
971         return 0;
972 out_quota_off:
973         ocfs2_disable_quotas(osb);
974         for (type = 0; type < OCFS2_MAXQUOTAS; type++)
975                 iput(inode[type]);
976         mlog_errno(status);
977         return status;
978 }
979 
980 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
981 {
982         int type;
983         struct inode *inode;
984         struct super_block *sb = osb->sb;
985         struct ocfs2_mem_dqinfo *oinfo;
986 
987         /* We mostly ignore errors in this function because there's not much
988          * we can do when we see them */
989         for (type = 0; type < OCFS2_MAXQUOTAS; type++) {
990                 if (!sb_has_quota_loaded(sb, type))
991                         continue;
992                 /* Cancel periodic syncing before we grab dqonoff_mutex */
993                 oinfo = sb_dqinfo(sb, type)->dqi_priv;
994                 cancel_delayed_work_sync(&oinfo->dqi_sync_work);
995                 inode = igrab(sb->s_dquot.files[type]);
996                 /* Turn off quotas. This will remove all dquot structures from
997                  * memory and so they will be automatically synced to global
998                  * quota files */
999                 dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
1000                                         DQUOT_LIMITS_ENABLED);
1001                 if (!inode)
1002                         continue;
1003                 iput(inode);
1004         }
1005 }
1006 
1007 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1008 {
1009         struct dentry *root;
1010         int status, sector_size;
1011         struct mount_options parsed_options;
1012         struct inode *inode = NULL;
1013         struct ocfs2_super *osb = NULL;
1014         struct buffer_head *bh = NULL;
1015         char nodestr[12];
1016         struct ocfs2_blockcheck_stats stats;
1017 
1018         trace_ocfs2_fill_super(sb, data, silent);
1019 
1020         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1021                 status = -EINVAL;
1022                 goto read_super_error;
1023         }
1024 
1025         /* probe for superblock */
1026         status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1027         if (status < 0) {
1028                 mlog(ML_ERROR, "superblock probe failed!\n");
1029                 goto read_super_error;
1030         }
1031 
1032         status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1033         osb = OCFS2_SB(sb);
1034         if (status < 0) {
1035                 mlog_errno(status);
1036                 goto read_super_error;
1037         }
1038         brelse(bh);
1039         bh = NULL;
1040 
1041         if (!ocfs2_check_set_options(sb, &parsed_options)) {
1042                 status = -EINVAL;
1043                 goto read_super_error;
1044         }
1045         osb->s_mount_opt = parsed_options.mount_opt;
1046         osb->s_atime_quantum = parsed_options.atime_quantum;
1047         osb->preferred_slot = parsed_options.slot;
1048         osb->osb_commit_interval = parsed_options.commit_interval;
1049 
1050         ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1051         osb->osb_resv_level = parsed_options.resv_level;
1052         osb->osb_dir_resv_level = parsed_options.resv_level;
1053         if (parsed_options.dir_resv_level == -1)
1054                 osb->osb_dir_resv_level = parsed_options.resv_level;
1055         else
1056                 osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1057 
1058         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1059         if (status)
1060                 goto read_super_error;
1061 
1062         sb->s_magic = OCFS2_SUPER_MAGIC;
1063 
1064         sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1065                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1066 
1067         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1068          * heartbeat=none */
1069         if (bdev_read_only(sb->s_bdev)) {
1070                 if (!(sb->s_flags & MS_RDONLY)) {
1071                         status = -EACCES;
1072                         mlog(ML_ERROR, "Readonly device detected but readonly "
1073                              "mount was not specified.\n");
1074                         goto read_super_error;
1075                 }
1076 
1077                 /* You should not be able to start a local heartbeat
1078                  * on a readonly device. */
1079                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1080                         status = -EROFS;
1081                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
1082                              "device.\n");
1083                         goto read_super_error;
1084                 }
1085 
1086                 status = ocfs2_check_journals_nolocks(osb);
1087                 if (status < 0) {
1088                         if (status == -EROFS)
1089                                 mlog(ML_ERROR, "Recovery required on readonly "
1090                                      "file system, but write access is "
1091                                      "unavailable.\n");
1092                         else
1093                                 mlog_errno(status);
1094                         goto read_super_error;
1095                 }
1096 
1097                 ocfs2_set_ro_flag(osb, 1);
1098 
1099                 printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1100                        "Cluster services will not be used for this mount. "
1101                        "Recovery will be skipped.\n", osb->dev_str);
1102         }
1103 
1104         if (!ocfs2_is_hard_readonly(osb)) {
1105                 if (sb->s_flags & MS_RDONLY)
1106                         ocfs2_set_ro_flag(osb, 0);
1107         }
1108 
1109         status = ocfs2_verify_heartbeat(osb);
1110         if (status < 0) {
1111                 mlog_errno(status);
1112                 goto read_super_error;
1113         }
1114 
1115         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1116                                                  ocfs2_debugfs_root);
1117         if (!osb->osb_debug_root) {
1118                 status = -EINVAL;
1119                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1120                 goto read_super_error;
1121         }
1122 
1123         osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1124                                             osb->osb_debug_root,
1125                                             osb,
1126                                             &ocfs2_osb_debug_fops);
1127         if (!osb->osb_ctxt) {
1128                 status = -EINVAL;
1129                 mlog_errno(status);
1130                 goto read_super_error;
1131         }
1132 
1133         if (ocfs2_meta_ecc(osb)) {
1134                 status = ocfs2_blockcheck_stats_debugfs_install(
1135                                                 &osb->osb_ecc_stats,
1136                                                 osb->osb_debug_root);
1137                 if (status) {
1138                         mlog(ML_ERROR,
1139                              "Unable to create blockcheck statistics "
1140                              "files\n");
1141                         goto read_super_error;
1142                 }
1143         }
1144 
1145         status = ocfs2_mount_volume(sb);
1146         if (status < 0)
1147                 goto read_super_error;
1148 
1149         if (osb->root_inode)
1150                 inode = igrab(osb->root_inode);
1151 
1152         if (!inode) {
1153                 status = -EIO;
1154                 mlog_errno(status);
1155                 goto read_super_error;
1156         }
1157 
1158         root = d_make_root(inode);
1159         if (!root) {
1160                 status = -ENOMEM;
1161                 mlog_errno(status);
1162                 goto read_super_error;
1163         }
1164 
1165         sb->s_root = root;
1166 
1167         ocfs2_complete_mount_recovery(osb);
1168 
1169         if (ocfs2_mount_local(osb))
1170                 snprintf(nodestr, sizeof(nodestr), "local");
1171         else
1172                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1173 
1174         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1175                "with %s data mode.\n",
1176                osb->dev_str, nodestr, osb->slot_num,
1177                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1178                "ordered");
1179 
1180         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1181         wake_up(&osb->osb_mount_event);
1182 
1183         /* Now we can initialize quotas because we can afford to wait
1184          * for cluster locks recovery now. That also means that truncation
1185          * log recovery can happen but that waits for proper quota setup */
1186         if (!(sb->s_flags & MS_RDONLY)) {
1187                 status = ocfs2_enable_quotas(osb);
1188                 if (status < 0) {
1189                         /* We have to err-out specially here because
1190                          * s_root is already set */
1191                         mlog_errno(status);
1192                         atomic_set(&osb->vol_state, VOLUME_DISABLED);
1193                         wake_up(&osb->osb_mount_event);
1194                         return status;
1195                 }
1196         }
1197 
1198         ocfs2_complete_quota_recovery(osb);
1199 
1200         /* Now we wake up again for processes waiting for quotas */
1201         atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1202         wake_up(&osb->osb_mount_event);
1203 
1204         /* Start this when the mount is almost sure of being successful */
1205         ocfs2_orphan_scan_start(osb);
1206 
1207         return status;
1208 
1209 read_super_error:
1210         brelse(bh);
1211 
1212         if (osb) {
1213                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
1214                 wake_up(&osb->osb_mount_event);
1215                 ocfs2_dismount_volume(sb, 1);
1216         }
1217 
1218         if (status)
1219                 mlog_errno(status);
1220         return status;
1221 }
1222 
1223 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1224                         int flags,
1225                         const char *dev_name,
1226                         void *data)
1227 {
1228         return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1229 }
1230 
1231 static struct file_system_type ocfs2_fs_type = {
1232         .owner          = THIS_MODULE,
1233         .name           = "ocfs2",
1234         .mount          = ocfs2_mount,
1235         .kill_sb        = kill_block_super,
1236         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1237         .next           = NULL
1238 };
1239 MODULE_ALIAS_FS("ocfs2");
1240 
1241 static int ocfs2_check_set_options(struct super_block *sb,
1242                                    struct mount_options *options)
1243 {
1244         if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1245             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1246                                          OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1247                 mlog(ML_ERROR, "User quotas were requested, but this "
1248                      "filesystem does not have the feature enabled.\n");
1249                 return 0;
1250         }
1251         if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1252             !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1253                                          OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1254                 mlog(ML_ERROR, "Group quotas were requested, but this "
1255                      "filesystem does not have the feature enabled.\n");
1256                 return 0;
1257         }
1258         if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1259             !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1260                 mlog(ML_ERROR, "ACL support requested but extended attributes "
1261                      "feature is not enabled\n");
1262                 return 0;
1263         }
1264         /* No ACL setting specified? Use XATTR feature... */
1265         if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1266                                     OCFS2_MOUNT_NO_POSIX_ACL))) {
1267                 if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1268                         options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1269                 else
1270                         options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1271         }
1272         return 1;
1273 }
1274 
1275 static int ocfs2_parse_options(struct super_block *sb,
1276                                char *options,
1277                                struct mount_options *mopt,
1278                                int is_remount)
1279 {
1280         int status, user_stack = 0;
1281         char *p;
1282         u32 tmp;
1283 
1284         trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1285 
1286         mopt->commit_interval = 0;
1287         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1288         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1289         mopt->slot = OCFS2_INVALID_SLOT;
1290         mopt->localalloc_opt = -1;
1291         mopt->cluster_stack[0] = '\0';
1292         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1293         mopt->dir_resv_level = -1;
1294 
1295         if (!options) {
1296                 status = 1;
1297                 goto bail;
1298         }
1299 
1300         while ((p = strsep(&options, ",")) != NULL) {
1301                 int token, option;
1302                 substring_t args[MAX_OPT_ARGS];
1303 
1304                 if (!*p)
1305                         continue;
1306 
1307                 token = match_token(p, tokens, args);
1308                 switch (token) {
1309                 case Opt_hb_local:
1310                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1311                         break;
1312                 case Opt_hb_none:
1313                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1314                         break;
1315                 case Opt_hb_global:
1316                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1317                         break;
1318                 case Opt_barrier:
1319                         if (match_int(&args[0], &option)) {
1320                                 status = 0;
1321                                 goto bail;
1322                         }
1323                         if (option)
1324                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1325                         else
1326                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1327                         break;
1328                 case Opt_intr:
1329                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1330                         break;
1331                 case Opt_nointr:
1332                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1333                         break;
1334                 case Opt_err_panic:
1335                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1336                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1337                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1338                         break;
1339                 case Opt_err_ro:
1340                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1341                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1342                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
1343                         break;
1344                 case Opt_err_cont:
1345                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1346                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1347                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
1348                         break;
1349                 case Opt_data_ordered:
1350                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1351                         break;
1352                 case Opt_data_writeback:
1353                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1354                         break;
1355                 case Opt_user_xattr:
1356                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1357                         break;
1358                 case Opt_nouser_xattr:
1359                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1360                         break;
1361                 case Opt_atime_quantum:
1362                         if (match_int(&args[0], &option)) {
1363                                 status = 0;
1364                                 goto bail;
1365                         }
1366                         if (option >= 0)
1367                                 mopt->atime_quantum = option;
1368                         break;
1369                 case Opt_slot:
1370                         option = 0;
1371                         if (match_int(&args[0], &option)) {
1372                                 status = 0;
1373                                 goto bail;
1374                         }
1375                         if (option)
1376                                 mopt->slot = (s16)option;
1377                         break;
1378                 case Opt_commit:
1379                         option = 0;
1380                         if (match_int(&args[0], &option)) {
1381                                 status = 0;
1382                                 goto bail;
1383                         }
1384                         if (option < 0)
1385                                 return 0;
1386                         if (option == 0)
1387                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1388                         mopt->commit_interval = HZ * option;
1389                         break;
1390                 case Opt_localalloc:
1391                         option = 0;
1392                         if (match_int(&args[0], &option)) {
1393                                 status = 0;
1394                                 goto bail;
1395                         }
1396                         if (option >= 0)
1397                                 mopt->localalloc_opt = option;
1398                         break;
1399                 case Opt_localflocks:
1400                         /*
1401                          * Changing this during remount could race
1402                          * flock() requests, or "unbalance" existing
1403                          * ones (e.g., a lock is taken in one mode but
1404                          * dropped in the other). If users care enough
1405                          * to flip locking modes during remount, we
1406                          * could add a "local" flag to individual
1407                          * flock structures for proper tracking of
1408                          * state.
1409                          */
1410                         if (!is_remount)
1411                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1412                         break;
1413                 case Opt_stack:
1414                         /* Check both that the option we were passed
1415                          * is of the right length and that it is a proper
1416                          * string of the right length.
1417                          */
1418                         if (((args[0].to - args[0].from) !=
1419                              OCFS2_STACK_LABEL_LEN) ||
1420                             (strnlen(args[0].from,
1421                                      OCFS2_STACK_LABEL_LEN) !=
1422                              OCFS2_STACK_LABEL_LEN)) {
1423                                 mlog(ML_ERROR,
1424                                      "Invalid cluster_stack option\n");
1425                                 status = 0;
1426                                 goto bail;
1427                         }
1428                         memcpy(mopt->cluster_stack, args[0].from,
1429                                OCFS2_STACK_LABEL_LEN);
1430                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1431                         /*
1432                          * Open code the memcmp here as we don't have
1433                          * an osb to pass to
1434                          * ocfs2_userspace_stack().
1435                          */
1436                         if (memcmp(mopt->cluster_stack,
1437                                    OCFS2_CLASSIC_CLUSTER_STACK,
1438                                    OCFS2_STACK_LABEL_LEN))
1439                                 user_stack = 1;
1440                         break;
1441                 case Opt_inode64:
1442                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1443                         break;
1444                 case Opt_usrquota:
1445                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1446                         break;
1447                 case Opt_grpquota:
1448                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1449                         break;
1450                 case Opt_coherency_buffered:
1451                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1452                         break;
1453                 case Opt_coherency_full:
1454                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1455                         break;
1456                 case Opt_acl:
1457                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1458                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1459                         break;
1460                 case Opt_noacl:
1461                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1462                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1463                         break;
1464                 case Opt_resv_level:
1465                         if (is_remount)
1466                                 break;
1467                         if (match_int(&args[0], &option)) {
1468                                 status = 0;
1469                                 goto bail;
1470                         }
1471                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1472                             option < OCFS2_MAX_RESV_LEVEL)
1473                                 mopt->resv_level = option;
1474                         break;
1475                 case Opt_dir_resv_level:
1476                         if (is_remount)
1477                                 break;
1478                         if (match_int(&args[0], &option)) {
1479                                 status = 0;
1480                                 goto bail;
1481                         }
1482                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1483                             option < OCFS2_MAX_RESV_LEVEL)
1484                                 mopt->dir_resv_level = option;
1485                         break;
1486                 case Opt_journal_async_commit:
1487                         mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
1488                         break;
1489                 default:
1490                         mlog(ML_ERROR,
1491                              "Unrecognized mount option \"%s\" "
1492                              "or missing value\n", p);
1493                         status = 0;
1494                         goto bail;
1495                 }
1496         }
1497 
1498         if (user_stack == 0) {
1499                 /* Ensure only one heartbeat mode */
1500                 tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1501                                          OCFS2_MOUNT_HB_GLOBAL |
1502                                          OCFS2_MOUNT_HB_NONE);
1503                 if (hweight32(tmp) != 1) {
1504                         mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1505                         status = 0;
1506                         goto bail;
1507                 }
1508         }
1509 
1510         status = 1;
1511 
1512 bail:
1513         return status;
1514 }
1515 
1516 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1517 {
1518         struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1519         unsigned long opts = osb->s_mount_opt;
1520         unsigned int local_alloc_megs;
1521 
1522         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1523                 seq_printf(s, ",_netdev");
1524                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1525                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1526                 else
1527                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1528         } else
1529                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1530 
1531         if (opts & OCFS2_MOUNT_NOINTR)
1532                 seq_printf(s, ",nointr");
1533 
1534         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1535                 seq_printf(s, ",data=writeback");
1536         else
1537                 seq_printf(s, ",data=ordered");
1538 
1539         if (opts & OCFS2_MOUNT_BARRIER)
1540                 seq_printf(s, ",barrier=1");
1541 
1542         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1543                 seq_printf(s, ",errors=panic");
1544         else if (opts & OCFS2_MOUNT_ERRORS_CONT)
1545                 seq_printf(s, ",errors=continue");
1546         else
1547                 seq_printf(s, ",errors=remount-ro");
1548 
1549         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1550                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1551 
1552         seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1553 
1554         if (osb->osb_commit_interval)
1555                 seq_printf(s, ",commit=%u",
1556                            (unsigned) (osb->osb_commit_interval / HZ));
1557 
1558         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1559         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1560                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1561 
1562         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1563                 seq_printf(s, ",localflocks,");
1564 
1565         if (osb->osb_cluster_stack[0])
1566                 seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
1567                                   OCFS2_STACK_LABEL_LEN);
1568         if (opts & OCFS2_MOUNT_USRQUOTA)
1569                 seq_printf(s, ",usrquota");
1570         if (opts & OCFS2_MOUNT_GRPQUOTA)
1571                 seq_printf(s, ",grpquota");
1572 
1573         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1574                 seq_printf(s, ",coherency=buffered");
1575         else
1576                 seq_printf(s, ",coherency=full");
1577 
1578         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1579                 seq_printf(s, ",nouser_xattr");
1580         else
1581                 seq_printf(s, ",user_xattr");
1582 
1583         if (opts & OCFS2_MOUNT_INODE64)
1584                 seq_printf(s, ",inode64");
1585 
1586         if (opts & OCFS2_MOUNT_POSIX_ACL)
1587                 seq_printf(s, ",acl");
1588         else
1589                 seq_printf(s, ",noacl");
1590 
1591         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1592                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1593 
1594         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1595                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1596 
1597         if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
1598                 seq_printf(s, ",journal_async_commit");
1599 
1600         return 0;
1601 }
1602 
1603 static int __init ocfs2_init(void)
1604 {
1605         int status;
1606 
1607         status = init_ocfs2_uptodate_cache();
1608         if (status < 0)
1609                 goto out1;
1610 
1611         status = ocfs2_initialize_mem_caches();
1612         if (status < 0)
1613                 goto out2;
1614 
1615         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1616         if (!ocfs2_wq) {
1617                 status = -ENOMEM;
1618                 goto out3;
1619         }
1620 
1621         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1622         if (!ocfs2_debugfs_root) {
1623                 status = -ENOMEM;
1624                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1625                 goto out4;
1626         }
1627 
1628         ocfs2_set_locking_protocol();
1629 
1630         status = register_quota_format(&ocfs2_quota_format);
1631         if (status < 0)
1632                 goto out4;
1633         status = register_filesystem(&ocfs2_fs_type);
1634         if (!status)
1635                 return 0;
1636 
1637         unregister_quota_format(&ocfs2_quota_format);
1638 out4:
1639         destroy_workqueue(ocfs2_wq);
1640         debugfs_remove(ocfs2_debugfs_root);
1641 out3:
1642         ocfs2_free_mem_caches();
1643 out2:
1644         exit_ocfs2_uptodate_cache();
1645 out1:
1646         mlog_errno(status);
1647         return status;
1648 }
1649 
1650 static void __exit ocfs2_exit(void)
1651 {
1652         if (ocfs2_wq) {
1653                 flush_workqueue(ocfs2_wq);
1654                 destroy_workqueue(ocfs2_wq);
1655         }
1656 
1657         unregister_quota_format(&ocfs2_quota_format);
1658 
1659         debugfs_remove(ocfs2_debugfs_root);
1660 
1661         ocfs2_free_mem_caches();
1662 
1663         unregister_filesystem(&ocfs2_fs_type);
1664 
1665         exit_ocfs2_uptodate_cache();
1666 }
1667 
1668 static void ocfs2_put_super(struct super_block *sb)
1669 {
1670         trace_ocfs2_put_super(sb);
1671 
1672         ocfs2_sync_blockdev(sb);
1673         ocfs2_dismount_volume(sb, 0);
1674 }
1675 
1676 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1677 {
1678         struct ocfs2_super *osb;
1679         u32 numbits, freebits;
1680         int status;
1681         struct ocfs2_dinode *bm_lock;
1682         struct buffer_head *bh = NULL;
1683         struct inode *inode = NULL;
1684 
1685         trace_ocfs2_statfs(dentry->d_sb, buf);
1686 
1687         osb = OCFS2_SB(dentry->d_sb);
1688 
1689         inode = ocfs2_get_system_file_inode(osb,
1690                                             GLOBAL_BITMAP_SYSTEM_INODE,
1691                                             OCFS2_INVALID_SLOT);
1692         if (!inode) {
1693                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1694                 status = -EIO;
1695                 goto bail;
1696         }
1697 
1698         status = ocfs2_inode_lock(inode, &bh, 0);
1699         if (status < 0) {
1700                 mlog_errno(status);
1701                 goto bail;
1702         }
1703 
1704         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1705 
1706         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1707         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1708 
1709         buf->f_type = OCFS2_SUPER_MAGIC;
1710         buf->f_bsize = dentry->d_sb->s_blocksize;
1711         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1712         buf->f_blocks = ((sector_t) numbits) *
1713                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1714         buf->f_bfree = ((sector_t) freebits) *
1715                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1716         buf->f_bavail = buf->f_bfree;
1717         buf->f_files = numbits;
1718         buf->f_ffree = freebits;
1719         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1720                                 & 0xFFFFFFFFUL;
1721         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1722                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1723 
1724         brelse(bh);
1725 
1726         ocfs2_inode_unlock(inode, 0);
1727         status = 0;
1728 bail:
1729         if (inode)
1730                 iput(inode);
1731 
1732         if (status)
1733                 mlog_errno(status);
1734 
1735         return status;
1736 }
1737 
1738 static void ocfs2_inode_init_once(void *data)
1739 {
1740         struct ocfs2_inode_info *oi = data;
1741 
1742         oi->ip_flags = 0;
1743         oi->ip_open_count = 0;
1744         spin_lock_init(&oi->ip_lock);
1745         ocfs2_extent_map_init(&oi->vfs_inode);
1746         INIT_LIST_HEAD(&oi->ip_io_markers);
1747         oi->ip_dir_start_lookup = 0;
1748         mutex_init(&oi->ip_unaligned_aio);
1749         init_rwsem(&oi->ip_alloc_sem);
1750         init_rwsem(&oi->ip_xattr_sem);
1751         mutex_init(&oi->ip_io_mutex);
1752 
1753         oi->ip_blkno = 0ULL;
1754         oi->ip_clusters = 0;
1755 
1756         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1757 
1758         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1759         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1760         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1761 
1762         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1763                                   &ocfs2_inode_caching_ops);
1764 
1765         inode_init_once(&oi->vfs_inode);
1766 }
1767 
1768 static int ocfs2_initialize_mem_caches(void)
1769 {
1770         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1771                                        sizeof(struct ocfs2_inode_info),
1772                                        0,
1773                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1774                                                 SLAB_MEM_SPREAD),
1775                                        ocfs2_inode_init_once);
1776         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1777                                         sizeof(struct ocfs2_dquot),
1778                                         0,
1779                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1780                                                 SLAB_MEM_SPREAD),
1781                                         NULL);
1782         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1783                                         sizeof(struct ocfs2_quota_chunk),
1784                                         0,
1785                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1786                                         NULL);
1787         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1788             !ocfs2_qf_chunk_cachep) {
1789                 if (ocfs2_inode_cachep)
1790                         kmem_cache_destroy(ocfs2_inode_cachep);
1791                 if (ocfs2_dquot_cachep)
1792                         kmem_cache_destroy(ocfs2_dquot_cachep);
1793                 if (ocfs2_qf_chunk_cachep)
1794                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1795                 return -ENOMEM;
1796         }
1797 
1798         return 0;
1799 }
1800 
1801 static void ocfs2_free_mem_caches(void)
1802 {
1803         /*
1804          * Make sure all delayed rcu free inodes are flushed before we
1805          * destroy cache.
1806          */
1807         rcu_barrier();
1808         if (ocfs2_inode_cachep)
1809                 kmem_cache_destroy(ocfs2_inode_cachep);
1810         ocfs2_inode_cachep = NULL;
1811 
1812         if (ocfs2_dquot_cachep)
1813                 kmem_cache_destroy(ocfs2_dquot_cachep);
1814         ocfs2_dquot_cachep = NULL;
1815 
1816         if (ocfs2_qf_chunk_cachep)
1817                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1818         ocfs2_qf_chunk_cachep = NULL;
1819 }
1820 
1821 static int ocfs2_get_sector(struct super_block *sb,
1822                             struct buffer_head **bh,
1823                             int block,
1824                             int sect_size)
1825 {
1826         if (!sb_set_blocksize(sb, sect_size)) {
1827                 mlog(ML_ERROR, "unable to set blocksize\n");
1828                 return -EIO;
1829         }
1830 
1831         *bh = sb_getblk(sb, block);
1832         if (!*bh) {
1833                 mlog_errno(-ENOMEM);
1834                 return -ENOMEM;
1835         }
1836         lock_buffer(*bh);
1837         if (!buffer_dirty(*bh))
1838                 clear_buffer_uptodate(*bh);
1839         unlock_buffer(*bh);
1840         ll_rw_block(READ, 1, bh);
1841         wait_on_buffer(*bh);
1842         if (!buffer_uptodate(*bh)) {
1843                 mlog_errno(-EIO);
1844                 brelse(*bh);
1845                 *bh = NULL;
1846                 return -EIO;
1847         }
1848 
1849         return 0;
1850 }
1851 
1852 static int ocfs2_mount_volume(struct super_block *sb)
1853 {
1854         int status = 0;
1855         int unlock_super = 0;
1856         struct ocfs2_super *osb = OCFS2_SB(sb);
1857 
1858         if (ocfs2_is_hard_readonly(osb))
1859                 goto leave;
1860 
1861         status = ocfs2_dlm_init(osb);
1862         if (status < 0) {
1863                 mlog_errno(status);
1864                 goto leave;
1865         }
1866 
1867         status = ocfs2_super_lock(osb, 1);
1868         if (status < 0) {
1869                 mlog_errno(status);
1870                 goto leave;
1871         }
1872         unlock_super = 1;
1873 
1874         /* This will load up the node map and add ourselves to it. */
1875         status = ocfs2_find_slot(osb);
1876         if (status < 0) {
1877                 mlog_errno(status);
1878                 goto leave;
1879         }
1880 
1881         /* load all node-local system inodes */
1882         status = ocfs2_init_local_system_inodes(osb);
1883         if (status < 0) {
1884                 mlog_errno(status);
1885                 goto leave;
1886         }
1887 
1888         status = ocfs2_check_volume(osb);
1889         if (status < 0) {
1890                 mlog_errno(status);
1891                 goto leave;
1892         }
1893 
1894         status = ocfs2_truncate_log_init(osb);
1895         if (status < 0)
1896                 mlog_errno(status);
1897 
1898 leave:
1899         if (unlock_super)
1900                 ocfs2_super_unlock(osb, 1);
1901 
1902         return status;
1903 }
1904 
1905 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1906 {
1907         int tmp, hangup_needed = 0;
1908         struct ocfs2_super *osb = NULL;
1909         char nodestr[12];
1910 
1911         trace_ocfs2_dismount_volume(sb);
1912 
1913         BUG_ON(!sb);
1914         osb = OCFS2_SB(sb);
1915         BUG_ON(!osb);
1916 
1917         debugfs_remove(osb->osb_ctxt);
1918 
1919         /* Orphan scan should be stopped as early as possible */
1920         ocfs2_orphan_scan_stop(osb);
1921 
1922         ocfs2_disable_quotas(osb);
1923 
1924         /* All dquots should be freed by now */
1925         WARN_ON(!llist_empty(&osb->dquot_drop_list));
1926         /* Wait for worker to be done with the work structure in osb */
1927         cancel_work_sync(&osb->dquot_drop_work);
1928 
1929         ocfs2_shutdown_local_alloc(osb);
1930 
1931         ocfs2_truncate_log_shutdown(osb);
1932 
1933         /* This will disable recovery and flush any recovery work. */
1934         ocfs2_recovery_exit(osb);
1935 
1936         ocfs2_journal_shutdown(osb);
1937 
1938         ocfs2_sync_blockdev(sb);
1939 
1940         ocfs2_purge_refcount_trees(osb);
1941 
1942         /* No cluster connection means we've failed during mount, so skip
1943          * all the steps which depended on that to complete. */
1944         if (osb->cconn) {
1945                 tmp = ocfs2_super_lock(osb, 1);
1946                 if (tmp < 0) {
1947                         mlog_errno(tmp);
1948                         return;
1949                 }
1950         }
1951 
1952         if (osb->slot_num != OCFS2_INVALID_SLOT)
1953                 ocfs2_put_slot(osb);
1954 
1955         if (osb->cconn)
1956                 ocfs2_super_unlock(osb, 1);
1957 
1958         ocfs2_release_system_inodes(osb);
1959 
1960         /*
1961          * If we're dismounting due to mount error, mount.ocfs2 will clean
1962          * up heartbeat.  If we're a local mount, there is no heartbeat.
1963          * If we failed before we got a uuid_str yet, we can't stop
1964          * heartbeat.  Otherwise, do it.
1965          */
1966         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1967             !ocfs2_is_hard_readonly(osb))
1968                 hangup_needed = 1;
1969 
1970         if (osb->cconn)
1971                 ocfs2_dlm_shutdown(osb, hangup_needed);
1972 
1973         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1974         debugfs_remove(osb->osb_debug_root);
1975 
1976         if (hangup_needed)
1977                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1978 
1979         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1980 
1981         if (ocfs2_mount_local(osb))
1982                 snprintf(nodestr, sizeof(nodestr), "local");
1983         else
1984                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1985 
1986         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1987                osb->dev_str, nodestr);
1988 
1989         ocfs2_delete_osb(osb);
1990         kfree(osb);
1991         sb->s_dev = 0;
1992         sb->s_fs_info = NULL;
1993 }
1994 
1995 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1996                                 unsigned uuid_bytes)
1997 {
1998         int i, ret;
1999         char *ptr;
2000 
2001         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2002 
2003         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2004         if (osb->uuid_str == NULL)
2005                 return -ENOMEM;
2006 
2007         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2008                 /* print with null */
2009                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
2010                 if (ret != 2) /* drop super cleans up */
2011                         return -EINVAL;
2012                 /* then only advance past the last char */
2013                 ptr += 2;
2014         }
2015 
2016         return 0;
2017 }
2018 
2019 /* Make sure entire volume is addressable by our journal.  Requires
2020    osb_clusters_at_boot to be valid and for the journal to have been
2021    initialized by ocfs2_journal_init(). */
2022 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2023 {
2024         int status = 0;
2025         u64 max_block =
2026                 ocfs2_clusters_to_blocks(osb->sb,
2027                                          osb->osb_clusters_at_boot) - 1;
2028 
2029         /* 32-bit block number is always OK. */
2030         if (max_block <= (u32)~0ULL)
2031                 goto out;
2032 
2033         /* Volume is "huge", so see if our journal is new enough to
2034            support it. */
2035         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2036                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2037               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2038                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2039                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2040                      "Enable the 'block64' journal option with tunefs.ocfs2");
2041                 status = -EFBIG;
2042                 goto out;
2043         }
2044 
2045  out:
2046         return status;
2047 }
2048 
2049 static int ocfs2_initialize_super(struct super_block *sb,
2050                                   struct buffer_head *bh,
2051                                   int sector_size,
2052                                   struct ocfs2_blockcheck_stats *stats)
2053 {
2054         int status;
2055         int i, cbits, bbits;
2056         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2057         struct inode *inode = NULL;
2058         struct ocfs2_journal *journal;
2059         struct ocfs2_super *osb;
2060         u64 total_blocks;
2061 
2062         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2063         if (!osb) {
2064                 status = -ENOMEM;
2065                 mlog_errno(status);
2066                 goto bail;
2067         }
2068 
2069         sb->s_fs_info = osb;
2070         sb->s_op = &ocfs2_sops;
2071         sb->s_d_op = &ocfs2_dentry_ops;
2072         sb->s_export_op = &ocfs2_export_ops;
2073         sb->s_qcop = &dquot_quotactl_sysfile_ops;
2074         sb->dq_op = &ocfs2_quota_operations;
2075         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2076         sb->s_xattr = ocfs2_xattr_handlers;
2077         sb->s_time_gran = 1;
2078         sb->s_flags |= MS_NOATIME;
2079         /* this is needed to support O_LARGEFILE */
2080         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2081         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2082         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2083         memcpy(sb->s_uuid, di->id2.i_super.s_uuid,
2084                sizeof(di->id2.i_super.s_uuid));
2085 
2086         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2087 
2088         for (i = 0; i < 3; i++)
2089                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2090         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2091 
2092         osb->sb = sb;
2093         /* Save off for ocfs2_rw_direct */
2094         osb->s_sectsize_bits = blksize_bits(sector_size);
2095         BUG_ON(!osb->s_sectsize_bits);
2096 
2097         spin_lock_init(&osb->dc_task_lock);
2098         init_waitqueue_head(&osb->dc_event);
2099         osb->dc_work_sequence = 0;
2100         osb->dc_wake_sequence = 0;
2101         INIT_LIST_HEAD(&osb->blocked_lock_list);
2102         osb->blocked_lock_count = 0;
2103         spin_lock_init(&osb->osb_lock);
2104         spin_lock_init(&osb->osb_xattr_lock);
2105         ocfs2_init_steal_slots(osb);
2106 
2107         mutex_init(&osb->system_file_mutex);
2108 
2109         atomic_set(&osb->alloc_stats.moves, 0);
2110         atomic_set(&osb->alloc_stats.local_data, 0);
2111         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2112         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2113         atomic_set(&osb->alloc_stats.bg_extends, 0);
2114 
2115         /* Copy the blockcheck stats from the superblock probe */
2116         osb->osb_ecc_stats = *stats;
2117 
2118         ocfs2_init_node_maps(osb);
2119 
2120         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2121                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2122 
2123         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2124         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2125                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2126                      osb->max_slots);
2127                 status = -EINVAL;
2128                 goto bail;
2129         }
2130 
2131         ocfs2_orphan_scan_init(osb);
2132 
2133         status = ocfs2_recovery_init(osb);
2134         if (status) {
2135                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2136                 mlog_errno(status);
2137                 goto bail;
2138         }
2139 
2140         init_waitqueue_head(&osb->checkpoint_event);
2141 
2142         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2143 
2144         osb->slot_num = OCFS2_INVALID_SLOT;
2145 
2146         osb->s_xattr_inline_size = le16_to_cpu(
2147                                         di->id2.i_super.s_xattr_inline_size);
2148 
2149         osb->local_alloc_state = OCFS2_LA_UNUSED;
2150         osb->local_alloc_bh = NULL;
2151         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2152 
2153         init_waitqueue_head(&osb->osb_mount_event);
2154 
2155         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2156         if (status) {
2157                 mlog_errno(status);
2158                 goto bail;
2159         }
2160 
2161         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2162         if (!osb->vol_label) {
2163                 mlog(ML_ERROR, "unable to alloc vol label\n");
2164                 status = -ENOMEM;
2165                 goto bail;
2166         }
2167 
2168         osb->slot_recovery_generations =
2169                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2170                         GFP_KERNEL);
2171         if (!osb->slot_recovery_generations) {
2172                 status = -ENOMEM;
2173                 mlog_errno(status);
2174                 goto bail;
2175         }
2176 
2177         init_waitqueue_head(&osb->osb_wipe_event);
2178         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2179                                         sizeof(*osb->osb_orphan_wipes),
2180                                         GFP_KERNEL);
2181         if (!osb->osb_orphan_wipes) {
2182                 status = -ENOMEM;
2183                 mlog_errno(status);
2184                 goto bail;
2185         }
2186 
2187         osb->osb_rf_lock_tree = RB_ROOT;
2188 
2189         osb->s_feature_compat =
2190                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2191         osb->s_feature_ro_compat =
2192                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2193         osb->s_feature_incompat =
2194                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2195 
2196         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2197                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2198                      "optional features (%x).\n", i);
2199                 status = -EINVAL;
2200                 goto bail;
2201         }
2202         if (!(osb->sb->s_flags & MS_RDONLY) &&
2203             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2204                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2205                      "unsupported optional features (%x).\n", i);
2206                 status = -EINVAL;
2207                 goto bail;
2208         }
2209 
2210         if (ocfs2_clusterinfo_valid(osb)) {
2211                 osb->osb_stackflags =
2212                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2213                 strlcpy(osb->osb_cluster_stack,
2214                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2215                        OCFS2_STACK_LABEL_LEN + 1);
2216                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2217                         mlog(ML_ERROR,
2218                              "couldn't mount because of an invalid "
2219                              "cluster stack label (%s) \n",
2220                              osb->osb_cluster_stack);
2221                         status = -EINVAL;
2222                         goto bail;
2223                 }
2224                 strlcpy(osb->osb_cluster_name,
2225                         OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
2226                         OCFS2_CLUSTER_NAME_LEN + 1);
2227         } else {
2228                 /* The empty string is identical with classic tools that
2229                  * don't know about s_cluster_info. */
2230                 osb->osb_cluster_stack[0] = '\0';
2231         }
2232 
2233         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2234 
2235         /* FIXME
2236          * This should be done in ocfs2_journal_init(), but unknown
2237          * ordering issues will cause the filesystem to crash.
2238          * If anyone wants to figure out what part of the code
2239          * refers to osb->journal before ocfs2_journal_init() is run,
2240          * be my guest.
2241          */
2242         /* initialize our journal structure */
2243 
2244         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2245         if (!journal) {
2246                 mlog(ML_ERROR, "unable to alloc journal\n");
2247                 status = -ENOMEM;
2248                 goto bail;
2249         }
2250         osb->journal = journal;
2251         journal->j_osb = osb;
2252 
2253         atomic_set(&journal->j_num_trans, 0);
2254         init_rwsem(&journal->j_trans_barrier);
2255         init_waitqueue_head(&journal->j_checkpointed);
2256         spin_lock_init(&journal->j_lock);
2257         journal->j_trans_id = (unsigned long) 1;
2258         INIT_LIST_HEAD(&journal->j_la_cleanups);
2259         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2260         journal->j_state = OCFS2_JOURNAL_FREE;
2261 
2262         INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
2263         init_llist_head(&osb->dquot_drop_list);
2264 
2265         /* get some pseudo constants for clustersize bits */
2266         osb->s_clustersize_bits =
2267                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2268         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2269 
2270         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2271             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2272                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2273                      osb->s_clustersize);
2274                 status = -EINVAL;
2275                 goto bail;
2276         }
2277 
2278         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2279                                                 le32_to_cpu(di->i_clusters));
2280 
2281         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2282                                            total_blocks);
2283         if (status) {
2284                 mlog(ML_ERROR, "Volume too large "
2285                      "to mount safely on this system");
2286                 status = -EFBIG;
2287                 goto bail;
2288         }
2289 
2290         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2291                                  sizeof(di->id2.i_super.s_uuid))) {
2292                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2293                 status = -ENOMEM;
2294                 goto bail;
2295         }
2296 
2297         strlcpy(osb->vol_label, di->id2.i_super.s_label,
2298                 OCFS2_MAX_VOL_LABEL_LEN);
2299         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2300         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2301         osb->first_cluster_group_blkno =
2302                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2303         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2304         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2305         trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2306                                      (unsigned long long)osb->root_blkno,
2307                                      (unsigned long long)osb->system_dir_blkno,
2308                                      osb->s_clustersize_bits);
2309 
2310         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2311         if (!osb->osb_dlm_debug) {
2312                 status = -ENOMEM;
2313                 mlog_errno(status);
2314                 goto bail;
2315         }
2316 
2317         atomic_set(&osb->vol_state, VOLUME_INIT);
2318 
2319         /* load root, system_dir, and all global system inodes */
2320         status = ocfs2_init_global_system_inodes(osb);
2321         if (status < 0) {
2322                 mlog_errno(status);
2323                 goto bail;
2324         }
2325 
2326         /*
2327          * global bitmap
2328          */
2329         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2330                                             OCFS2_INVALID_SLOT);
2331         if (!inode) {
2332                 status = -EINVAL;
2333                 mlog_errno(status);
2334                 goto bail;
2335         }
2336 
2337         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2338         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2339         iput(inode);
2340 
2341         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2342                                  osb->s_feature_incompat) * 8;
2343 
2344         status = ocfs2_init_slot_info(osb);
2345         if (status < 0) {
2346                 mlog_errno(status);
2347                 goto bail;
2348         }
2349         cleancache_init_shared_fs(sb);
2350 
2351 bail:
2352         return status;
2353 }
2354 
2355 /*
2356  * will return: -EAGAIN if it is ok to keep searching for superblocks
2357  *              -EINVAL if there is a bad superblock
2358  *              0 on success
2359  */
2360 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2361                                struct buffer_head *bh,
2362                                u32 blksz,
2363                                struct ocfs2_blockcheck_stats *stats)
2364 {
2365         int status = -EAGAIN;
2366 
2367         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2368                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2369                 /* We have to do a raw check of the feature here */
2370                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2371                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2372                         status = ocfs2_block_check_validate(bh->b_data,
2373                                                             bh->b_size,
2374                                                             &di->i_check,
2375                                                             stats);
2376                         if (status)
2377                                 goto out;
2378                 }
2379                 status = -EINVAL;
2380                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2381                         mlog(ML_ERROR, "found superblock with incorrect block "
2382                              "size: found %u, should be %u\n",
2383                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2384                                blksz);
2385                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2386                            OCFS2_MAJOR_REV_LEVEL ||
2387                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2388                            OCFS2_MINOR_REV_LEVEL) {
2389                         mlog(ML_ERROR, "found superblock with bad version: "
2390                              "found %u.%u, should be %u.%u\n",
2391                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2392                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2393                              OCFS2_MAJOR_REV_LEVEL,
2394                              OCFS2_MINOR_REV_LEVEL);
2395                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2396                         mlog(ML_ERROR, "bad block number on superblock: "
2397                              "found %llu, should be %llu\n",
2398                              (unsigned long long)le64_to_cpu(di->i_blkno),
2399                              (unsigned long long)bh->b_blocknr);
2400                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2401                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2402                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2403                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2404                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2405                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2406                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2407                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2408                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2409                         mlog(ML_ERROR,
2410                              "Superblock slots found greater than file system "
2411                              "maximum: found %u, max %u\n",
2412                              le16_to_cpu(di->id2.i_super.s_max_slots),
2413                              OCFS2_MAX_SLOTS);
2414                 } else {
2415                         /* found it! */
2416                         status = 0;
2417                 }
2418         }
2419 
2420 out:
2421         if (status && status != -EAGAIN)
2422                 mlog_errno(status);
2423         return status;
2424 }
2425 
2426 static int ocfs2_check_volume(struct ocfs2_super *osb)
2427 {
2428         int status;
2429         int dirty;
2430         int local;
2431         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2432                                                   * recover
2433                                                   * ourselves. */
2434 
2435         /* Init our journal object. */
2436         status = ocfs2_journal_init(osb->journal, &dirty);
2437         if (status < 0) {
2438                 mlog(ML_ERROR, "Could not initialize journal!\n");
2439                 goto finally;
2440         }
2441 
2442         /* Now that journal has been initialized, check to make sure
2443            entire volume is addressable. */
2444         status = ocfs2_journal_addressable(osb);
2445         if (status)
2446                 goto finally;
2447 
2448         /* If the journal was unmounted cleanly then we don't want to
2449          * recover anything. Otherwise, journal_load will do that
2450          * dirty work for us :) */
2451         if (!dirty) {
2452                 status = ocfs2_journal_wipe(osb->journal, 0);
2453                 if (status < 0) {
2454                         mlog_errno(status);
2455                         goto finally;
2456                 }
2457         } else {
2458                 printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2459                        "unmounted cleanly, recovering it.\n", osb->dev_str);
2460         }
2461 
2462         local = ocfs2_mount_local(osb);
2463 
2464         /* will play back anything left in the journal. */
2465         status = ocfs2_journal_load(osb->journal, local, dirty);
2466         if (status < 0) {
2467                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2468                 goto finally;
2469         }
2470 
2471         if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
2472                 jbd2_journal_set_features(osb->journal->j_journal,
2473                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2474                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2475         else
2476                 jbd2_journal_clear_features(osb->journal->j_journal,
2477                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2478                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2479 
2480         if (dirty) {
2481                 /* recover my local alloc if we didn't unmount cleanly. */
2482                 status = ocfs2_begin_local_alloc_recovery(osb,
2483                                                           osb->slot_num,
2484                                                           &local_alloc);
2485                 if (status < 0) {
2486                         mlog_errno(status);
2487                         goto finally;
2488                 }
2489                 /* we complete the recovery process after we've marked
2490                  * ourselves as mounted. */
2491         }
2492 
2493         status = ocfs2_load_local_alloc(osb);
2494         if (status < 0) {
2495                 mlog_errno(status);
2496                 goto finally;
2497         }
2498 
2499         if (dirty) {
2500                 /* Recovery will be completed after we've mounted the
2501                  * rest of the volume. */
2502                 osb->dirty = 1;
2503                 osb->local_alloc_copy = local_alloc;
2504                 local_alloc = NULL;
2505         }
2506 
2507         /* go through each journal, trylock it and if you get the
2508          * lock, and it's marked as dirty, set the bit in the recover
2509          * map and launch a recovery thread for it. */
2510         status = ocfs2_mark_dead_nodes(osb);
2511         if (status < 0) {
2512                 mlog_errno(status);
2513                 goto finally;
2514         }
2515 
2516         status = ocfs2_compute_replay_slots(osb);
2517         if (status < 0)
2518                 mlog_errno(status);
2519 
2520 finally:
2521         kfree(local_alloc);
2522 
2523         if (status)
2524                 mlog_errno(status);
2525         return status;
2526 }
2527 
2528 /*
2529  * The routine gets called from dismount or close whenever a dismount on
2530  * volume is requested and the osb open count becomes 1.
2531  * It will remove the osb from the global list and also free up all the
2532  * initialized resources and fileobject.
2533  */
2534 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2535 {
2536         /* This function assumes that the caller has the main osb resource */
2537 
2538         ocfs2_free_slot_info(osb);
2539 
2540         kfree(osb->osb_orphan_wipes);
2541         kfree(osb->slot_recovery_generations);
2542         /* FIXME
2543          * This belongs in journal shutdown, but because we have to
2544          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2545          * we free it here.
2546          */
2547         kfree(osb->journal);
2548         kfree(osb->local_alloc_copy);
2549         kfree(osb->uuid_str);
2550         kfree(osb->vol_label);
2551         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2552         memset(osb, 0, sizeof(struct ocfs2_super));
2553 }
2554 
2555 /* Depending on the mount option passed, perform one of the following:
2556  * Put OCFS2 into a readonly state (default)
2557  * Return EIO so that only the process errs
2558  * Fix the error as if fsck.ocfs2 -y
2559  * panic
2560  */
2561 static int ocfs2_handle_error(struct super_block *sb)
2562 {
2563         struct ocfs2_super *osb = OCFS2_SB(sb);
2564         int rv = 0;
2565 
2566         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2567         pr_crit("On-disk corruption discovered. "
2568                 "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
2569 
2570         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
2571                 panic("OCFS2: (device %s): panic forced after error\n",
2572                       sb->s_id);
2573         } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
2574                 pr_crit("OCFS2: Returning error to the calling process.\n");
2575                 rv = -EIO;
2576         } else { /* default option */
2577                 rv = -EROFS;
2578                 if (sb->s_flags & MS_RDONLY &&
2579                                 (ocfs2_is_soft_readonly(osb) ||
2580                                  ocfs2_is_hard_readonly(osb)))
2581                         return rv;
2582 
2583                 pr_crit("OCFS2: File system is now read-only.\n");
2584                 sb->s_flags |= MS_RDONLY;
2585                 ocfs2_set_ro_flag(osb, 0);
2586         }
2587 
2588         return rv;
2589 }
2590 
2591 int __ocfs2_error(struct super_block *sb, const char *function,
2592                   const char *fmt, ...)
2593 {
2594         struct va_format vaf;
2595         va_list args;
2596 
2597         va_start(args, fmt);
2598         vaf.fmt = fmt;
2599         vaf.va = &args;
2600 
2601         /* Not using mlog here because we want to show the actual
2602          * function the error came from. */
2603         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %pV",
2604                sb->s_id, function, &vaf);
2605 
2606         va_end(args);
2607 
2608         return ocfs2_handle_error(sb);
2609 }
2610 
2611 /* Handle critical errors. This is intentionally more drastic than
2612  * ocfs2_handle_error, so we only use for things like journal errors,
2613  * etc. */
2614 void __ocfs2_abort(struct super_block *sb, const char *function,
2615                    const char *fmt, ...)
2616 {
2617         struct va_format vaf;
2618         va_list args;
2619 
2620         va_start(args, fmt);
2621 
2622         vaf.fmt = fmt;
2623         vaf.va = &args;
2624 
2625         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
2626                sb->s_id, function, &vaf);
2627 
2628         va_end(args);
2629 
2630         /* We don't have the cluster support yet to go straight to
2631          * hard readonly in here. Until then, we want to keep
2632          * ocfs2_abort() so that we can at least mark critical
2633          * errors.
2634          *
2635          * TODO: This should abort the journal and alert other nodes
2636          * that our slot needs recovery. */
2637 
2638         /* Force a panic(). This stinks, but it's better than letting
2639          * things continue without having a proper hard readonly
2640          * here. */
2641         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2642                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2643         ocfs2_handle_error(sb);
2644 }
2645 
2646 /*
2647  * Void signal blockers, because in-kernel sigprocmask() only fails
2648  * when SIG_* is wrong.
2649  */
2650 void ocfs2_block_signals(sigset_t *oldset)
2651 {
2652         int rc;
2653         sigset_t blocked;
2654 
2655         sigfillset(&blocked);
2656         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2657         BUG_ON(rc);
2658 }
2659 
2660 void ocfs2_unblock_signals(sigset_t *oldset)
2661 {
2662         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2663         BUG_ON(rc);
2664 }
2665 
2666 module_init(ocfs2_init);
2667 module_exit(ocfs2_exit);
2668 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us