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 4.5

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         int token, option;
1284         substring_t args[MAX_OPT_ARGS];
1285 
1286         trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1287 
1288         mopt->commit_interval = 0;
1289         mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1290         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1291         mopt->slot = OCFS2_INVALID_SLOT;
1292         mopt->localalloc_opt = -1;
1293         mopt->cluster_stack[0] = '\0';
1294         mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1295         mopt->dir_resv_level = -1;
1296 
1297         if (!options) {
1298                 status = 1;
1299                 goto bail;
1300         }
1301 
1302         while ((p = strsep(&options, ",")) != NULL) {
1303                 if (!*p)
1304                         continue;
1305 
1306                 token = match_token(p, tokens, args);
1307                 switch (token) {
1308                 case Opt_hb_local:
1309                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1310                         break;
1311                 case Opt_hb_none:
1312                         mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1313                         break;
1314                 case Opt_hb_global:
1315                         mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1316                         break;
1317                 case Opt_barrier:
1318                         if (match_int(&args[0], &option)) {
1319                                 status = 0;
1320                                 goto bail;
1321                         }
1322                         if (option)
1323                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1324                         else
1325                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1326                         break;
1327                 case Opt_intr:
1328                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1329                         break;
1330                 case Opt_nointr:
1331                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1332                         break;
1333                 case Opt_err_panic:
1334                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1335                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1336                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1337                         break;
1338                 case Opt_err_ro:
1339                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
1340                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1341                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
1342                         break;
1343                 case Opt_err_cont:
1344                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
1345                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1346                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
1347                         break;
1348                 case Opt_data_ordered:
1349                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1350                         break;
1351                 case Opt_data_writeback:
1352                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1353                         break;
1354                 case Opt_user_xattr:
1355                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1356                         break;
1357                 case Opt_nouser_xattr:
1358                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1359                         break;
1360                 case Opt_atime_quantum:
1361                         if (match_int(&args[0], &option)) {
1362                                 status = 0;
1363                                 goto bail;
1364                         }
1365                         if (option >= 0)
1366                                 mopt->atime_quantum = option;
1367                         break;
1368                 case Opt_slot:
1369                         if (match_int(&args[0], &option)) {
1370                                 status = 0;
1371                                 goto bail;
1372                         }
1373                         if (option)
1374                                 mopt->slot = (s16)option;
1375                         break;
1376                 case Opt_commit:
1377                         if (match_int(&args[0], &option)) {
1378                                 status = 0;
1379                                 goto bail;
1380                         }
1381                         if (option < 0)
1382                                 return 0;
1383                         if (option == 0)
1384                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1385                         mopt->commit_interval = HZ * option;
1386                         break;
1387                 case Opt_localalloc:
1388                         if (match_int(&args[0], &option)) {
1389                                 status = 0;
1390                                 goto bail;
1391                         }
1392                         if (option >= 0)
1393                                 mopt->localalloc_opt = option;
1394                         break;
1395                 case Opt_localflocks:
1396                         /*
1397                          * Changing this during remount could race
1398                          * flock() requests, or "unbalance" existing
1399                          * ones (e.g., a lock is taken in one mode but
1400                          * dropped in the other). If users care enough
1401                          * to flip locking modes during remount, we
1402                          * could add a "local" flag to individual
1403                          * flock structures for proper tracking of
1404                          * state.
1405                          */
1406                         if (!is_remount)
1407                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1408                         break;
1409                 case Opt_stack:
1410                         /* Check both that the option we were passed
1411                          * is of the right length and that it is a proper
1412                          * string of the right length.
1413                          */
1414                         if (((args[0].to - args[0].from) !=
1415                              OCFS2_STACK_LABEL_LEN) ||
1416                             (strnlen(args[0].from,
1417                                      OCFS2_STACK_LABEL_LEN) !=
1418                              OCFS2_STACK_LABEL_LEN)) {
1419                                 mlog(ML_ERROR,
1420                                      "Invalid cluster_stack option\n");
1421                                 status = 0;
1422                                 goto bail;
1423                         }
1424                         memcpy(mopt->cluster_stack, args[0].from,
1425                                OCFS2_STACK_LABEL_LEN);
1426                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1427                         /*
1428                          * Open code the memcmp here as we don't have
1429                          * an osb to pass to
1430                          * ocfs2_userspace_stack().
1431                          */
1432                         if (memcmp(mopt->cluster_stack,
1433                                    OCFS2_CLASSIC_CLUSTER_STACK,
1434                                    OCFS2_STACK_LABEL_LEN))
1435                                 user_stack = 1;
1436                         break;
1437                 case Opt_inode64:
1438                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1439                         break;
1440                 case Opt_usrquota:
1441                         mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1442                         break;
1443                 case Opt_grpquota:
1444                         mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1445                         break;
1446                 case Opt_coherency_buffered:
1447                         mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1448                         break;
1449                 case Opt_coherency_full:
1450                         mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1451                         break;
1452                 case Opt_acl:
1453                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1454                         mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1455                         break;
1456                 case Opt_noacl:
1457                         mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1458                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1459                         break;
1460                 case Opt_resv_level:
1461                         if (is_remount)
1462                                 break;
1463                         if (match_int(&args[0], &option)) {
1464                                 status = 0;
1465                                 goto bail;
1466                         }
1467                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1468                             option < OCFS2_MAX_RESV_LEVEL)
1469                                 mopt->resv_level = option;
1470                         break;
1471                 case Opt_dir_resv_level:
1472                         if (is_remount)
1473                                 break;
1474                         if (match_int(&args[0], &option)) {
1475                                 status = 0;
1476                                 goto bail;
1477                         }
1478                         if (option >= OCFS2_MIN_RESV_LEVEL &&
1479                             option < OCFS2_MAX_RESV_LEVEL)
1480                                 mopt->dir_resv_level = option;
1481                         break;
1482                 case Opt_journal_async_commit:
1483                         mopt->mount_opt |= OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT;
1484                         break;
1485                 default:
1486                         mlog(ML_ERROR,
1487                              "Unrecognized mount option \"%s\" "
1488                              "or missing value\n", p);
1489                         status = 0;
1490                         goto bail;
1491                 }
1492         }
1493 
1494         if (user_stack == 0) {
1495                 /* Ensure only one heartbeat mode */
1496                 tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1497                                          OCFS2_MOUNT_HB_GLOBAL |
1498                                          OCFS2_MOUNT_HB_NONE);
1499                 if (hweight32(tmp) != 1) {
1500                         mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1501                         status = 0;
1502                         goto bail;
1503                 }
1504         }
1505 
1506         status = 1;
1507 
1508 bail:
1509         return status;
1510 }
1511 
1512 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1513 {
1514         struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1515         unsigned long opts = osb->s_mount_opt;
1516         unsigned int local_alloc_megs;
1517 
1518         if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1519                 seq_printf(s, ",_netdev");
1520                 if (opts & OCFS2_MOUNT_HB_LOCAL)
1521                         seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1522                 else
1523                         seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1524         } else
1525                 seq_printf(s, ",%s", OCFS2_HB_NONE);
1526 
1527         if (opts & OCFS2_MOUNT_NOINTR)
1528                 seq_printf(s, ",nointr");
1529 
1530         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1531                 seq_printf(s, ",data=writeback");
1532         else
1533                 seq_printf(s, ",data=ordered");
1534 
1535         if (opts & OCFS2_MOUNT_BARRIER)
1536                 seq_printf(s, ",barrier=1");
1537 
1538         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1539                 seq_printf(s, ",errors=panic");
1540         else if (opts & OCFS2_MOUNT_ERRORS_CONT)
1541                 seq_printf(s, ",errors=continue");
1542         else
1543                 seq_printf(s, ",errors=remount-ro");
1544 
1545         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1546                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1547 
1548         seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1549 
1550         if (osb->osb_commit_interval)
1551                 seq_printf(s, ",commit=%u",
1552                            (unsigned) (osb->osb_commit_interval / HZ));
1553 
1554         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1555         if (local_alloc_megs != ocfs2_la_default_mb(osb))
1556                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1557 
1558         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1559                 seq_printf(s, ",localflocks,");
1560 
1561         if (osb->osb_cluster_stack[0])
1562                 seq_show_option_n(s, "cluster_stack", osb->osb_cluster_stack,
1563                                   OCFS2_STACK_LABEL_LEN);
1564         if (opts & OCFS2_MOUNT_USRQUOTA)
1565                 seq_printf(s, ",usrquota");
1566         if (opts & OCFS2_MOUNT_GRPQUOTA)
1567                 seq_printf(s, ",grpquota");
1568 
1569         if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1570                 seq_printf(s, ",coherency=buffered");
1571         else
1572                 seq_printf(s, ",coherency=full");
1573 
1574         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1575                 seq_printf(s, ",nouser_xattr");
1576         else
1577                 seq_printf(s, ",user_xattr");
1578 
1579         if (opts & OCFS2_MOUNT_INODE64)
1580                 seq_printf(s, ",inode64");
1581 
1582         if (opts & OCFS2_MOUNT_POSIX_ACL)
1583                 seq_printf(s, ",acl");
1584         else
1585                 seq_printf(s, ",noacl");
1586 
1587         if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1588                 seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1589 
1590         if (osb->osb_dir_resv_level != osb->osb_resv_level)
1591                 seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1592 
1593         if (opts & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
1594                 seq_printf(s, ",journal_async_commit");
1595 
1596         return 0;
1597 }
1598 
1599 static int __init ocfs2_init(void)
1600 {
1601         int status;
1602 
1603         status = init_ocfs2_uptodate_cache();
1604         if (status < 0)
1605                 goto out1;
1606 
1607         status = ocfs2_initialize_mem_caches();
1608         if (status < 0)
1609                 goto out2;
1610 
1611         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1612         if (!ocfs2_wq) {
1613                 status = -ENOMEM;
1614                 goto out3;
1615         }
1616 
1617         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1618         if (!ocfs2_debugfs_root) {
1619                 status = -ENOMEM;
1620                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1621                 goto out4;
1622         }
1623 
1624         ocfs2_set_locking_protocol();
1625 
1626         status = register_quota_format(&ocfs2_quota_format);
1627         if (status < 0)
1628                 goto out4;
1629         status = register_filesystem(&ocfs2_fs_type);
1630         if (!status)
1631                 return 0;
1632 
1633         unregister_quota_format(&ocfs2_quota_format);
1634 out4:
1635         destroy_workqueue(ocfs2_wq);
1636         debugfs_remove(ocfs2_debugfs_root);
1637 out3:
1638         ocfs2_free_mem_caches();
1639 out2:
1640         exit_ocfs2_uptodate_cache();
1641 out1:
1642         mlog_errno(status);
1643         return status;
1644 }
1645 
1646 static void __exit ocfs2_exit(void)
1647 {
1648         if (ocfs2_wq) {
1649                 flush_workqueue(ocfs2_wq);
1650                 destroy_workqueue(ocfs2_wq);
1651         }
1652 
1653         unregister_quota_format(&ocfs2_quota_format);
1654 
1655         debugfs_remove(ocfs2_debugfs_root);
1656 
1657         ocfs2_free_mem_caches();
1658 
1659         unregister_filesystem(&ocfs2_fs_type);
1660 
1661         exit_ocfs2_uptodate_cache();
1662 }
1663 
1664 static void ocfs2_put_super(struct super_block *sb)
1665 {
1666         trace_ocfs2_put_super(sb);
1667 
1668         ocfs2_sync_blockdev(sb);
1669         ocfs2_dismount_volume(sb, 0);
1670 }
1671 
1672 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1673 {
1674         struct ocfs2_super *osb;
1675         u32 numbits, freebits;
1676         int status;
1677         struct ocfs2_dinode *bm_lock;
1678         struct buffer_head *bh = NULL;
1679         struct inode *inode = NULL;
1680 
1681         trace_ocfs2_statfs(dentry->d_sb, buf);
1682 
1683         osb = OCFS2_SB(dentry->d_sb);
1684 
1685         inode = ocfs2_get_system_file_inode(osb,
1686                                             GLOBAL_BITMAP_SYSTEM_INODE,
1687                                             OCFS2_INVALID_SLOT);
1688         if (!inode) {
1689                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1690                 status = -EIO;
1691                 goto bail;
1692         }
1693 
1694         status = ocfs2_inode_lock(inode, &bh, 0);
1695         if (status < 0) {
1696                 mlog_errno(status);
1697                 goto bail;
1698         }
1699 
1700         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1701 
1702         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1703         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1704 
1705         buf->f_type = OCFS2_SUPER_MAGIC;
1706         buf->f_bsize = dentry->d_sb->s_blocksize;
1707         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1708         buf->f_blocks = ((sector_t) numbits) *
1709                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1710         buf->f_bfree = ((sector_t) freebits) *
1711                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1712         buf->f_bavail = buf->f_bfree;
1713         buf->f_files = numbits;
1714         buf->f_ffree = freebits;
1715         buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1716                                 & 0xFFFFFFFFUL;
1717         buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1718                                 OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1719 
1720         brelse(bh);
1721 
1722         ocfs2_inode_unlock(inode, 0);
1723         status = 0;
1724 bail:
1725         iput(inode);
1726 
1727         if (status)
1728                 mlog_errno(status);
1729 
1730         return status;
1731 }
1732 
1733 static void ocfs2_inode_init_once(void *data)
1734 {
1735         struct ocfs2_inode_info *oi = data;
1736 
1737         oi->ip_flags = 0;
1738         oi->ip_open_count = 0;
1739         spin_lock_init(&oi->ip_lock);
1740         ocfs2_extent_map_init(&oi->vfs_inode);
1741         INIT_LIST_HEAD(&oi->ip_io_markers);
1742         oi->ip_dir_start_lookup = 0;
1743         mutex_init(&oi->ip_unaligned_aio);
1744         init_rwsem(&oi->ip_alloc_sem);
1745         init_rwsem(&oi->ip_xattr_sem);
1746         mutex_init(&oi->ip_io_mutex);
1747 
1748         oi->ip_blkno = 0ULL;
1749         oi->ip_clusters = 0;
1750 
1751         ocfs2_resv_init_once(&oi->ip_la_data_resv);
1752 
1753         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1754         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1755         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1756 
1757         ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1758                                   &ocfs2_inode_caching_ops);
1759 
1760         inode_init_once(&oi->vfs_inode);
1761 }
1762 
1763 static int ocfs2_initialize_mem_caches(void)
1764 {
1765         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1766                                        sizeof(struct ocfs2_inode_info),
1767                                        0,
1768                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1769                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1770                                        ocfs2_inode_init_once);
1771         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1772                                         sizeof(struct ocfs2_dquot),
1773                                         0,
1774                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1775                                                 SLAB_MEM_SPREAD),
1776                                         NULL);
1777         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1778                                         sizeof(struct ocfs2_quota_chunk),
1779                                         0,
1780                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1781                                         NULL);
1782         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1783             !ocfs2_qf_chunk_cachep) {
1784                 if (ocfs2_inode_cachep)
1785                         kmem_cache_destroy(ocfs2_inode_cachep);
1786                 if (ocfs2_dquot_cachep)
1787                         kmem_cache_destroy(ocfs2_dquot_cachep);
1788                 if (ocfs2_qf_chunk_cachep)
1789                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1790                 return -ENOMEM;
1791         }
1792 
1793         return 0;
1794 }
1795 
1796 static void ocfs2_free_mem_caches(void)
1797 {
1798         /*
1799          * Make sure all delayed rcu free inodes are flushed before we
1800          * destroy cache.
1801          */
1802         rcu_barrier();
1803         if (ocfs2_inode_cachep)
1804                 kmem_cache_destroy(ocfs2_inode_cachep);
1805         ocfs2_inode_cachep = NULL;
1806 
1807         if (ocfs2_dquot_cachep)
1808                 kmem_cache_destroy(ocfs2_dquot_cachep);
1809         ocfs2_dquot_cachep = NULL;
1810 
1811         if (ocfs2_qf_chunk_cachep)
1812                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1813         ocfs2_qf_chunk_cachep = NULL;
1814 }
1815 
1816 static int ocfs2_get_sector(struct super_block *sb,
1817                             struct buffer_head **bh,
1818                             int block,
1819                             int sect_size)
1820 {
1821         if (!sb_set_blocksize(sb, sect_size)) {
1822                 mlog(ML_ERROR, "unable to set blocksize\n");
1823                 return -EIO;
1824         }
1825 
1826         *bh = sb_getblk(sb, block);
1827         if (!*bh) {
1828                 mlog_errno(-ENOMEM);
1829                 return -ENOMEM;
1830         }
1831         lock_buffer(*bh);
1832         if (!buffer_dirty(*bh))
1833                 clear_buffer_uptodate(*bh);
1834         unlock_buffer(*bh);
1835         ll_rw_block(READ, 1, bh);
1836         wait_on_buffer(*bh);
1837         if (!buffer_uptodate(*bh)) {
1838                 mlog_errno(-EIO);
1839                 brelse(*bh);
1840                 *bh = NULL;
1841                 return -EIO;
1842         }
1843 
1844         return 0;
1845 }
1846 
1847 static int ocfs2_mount_volume(struct super_block *sb)
1848 {
1849         int status = 0;
1850         int unlock_super = 0;
1851         struct ocfs2_super *osb = OCFS2_SB(sb);
1852 
1853         if (ocfs2_is_hard_readonly(osb))
1854                 goto leave;
1855 
1856         status = ocfs2_dlm_init(osb);
1857         if (status < 0) {
1858                 mlog_errno(status);
1859                 goto leave;
1860         }
1861 
1862         status = ocfs2_super_lock(osb, 1);
1863         if (status < 0) {
1864                 mlog_errno(status);
1865                 goto leave;
1866         }
1867         unlock_super = 1;
1868 
1869         /* This will load up the node map and add ourselves to it. */
1870         status = ocfs2_find_slot(osb);
1871         if (status < 0) {
1872                 mlog_errno(status);
1873                 goto leave;
1874         }
1875 
1876         /* load all node-local system inodes */
1877         status = ocfs2_init_local_system_inodes(osb);
1878         if (status < 0) {
1879                 mlog_errno(status);
1880                 goto leave;
1881         }
1882 
1883         status = ocfs2_check_volume(osb);
1884         if (status < 0) {
1885                 mlog_errno(status);
1886                 goto leave;
1887         }
1888 
1889         status = ocfs2_truncate_log_init(osb);
1890         if (status < 0)
1891                 mlog_errno(status);
1892 
1893 leave:
1894         if (unlock_super)
1895                 ocfs2_super_unlock(osb, 1);
1896 
1897         return status;
1898 }
1899 
1900 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1901 {
1902         int tmp, hangup_needed = 0;
1903         struct ocfs2_super *osb = NULL;
1904         char nodestr[12];
1905 
1906         trace_ocfs2_dismount_volume(sb);
1907 
1908         BUG_ON(!sb);
1909         osb = OCFS2_SB(sb);
1910         BUG_ON(!osb);
1911 
1912         debugfs_remove(osb->osb_ctxt);
1913 
1914         /* Orphan scan should be stopped as early as possible */
1915         ocfs2_orphan_scan_stop(osb);
1916 
1917         ocfs2_disable_quotas(osb);
1918 
1919         /* All dquots should be freed by now */
1920         WARN_ON(!llist_empty(&osb->dquot_drop_list));
1921         /* Wait for worker to be done with the work structure in osb */
1922         cancel_work_sync(&osb->dquot_drop_work);
1923 
1924         ocfs2_shutdown_local_alloc(osb);
1925 
1926         ocfs2_truncate_log_shutdown(osb);
1927 
1928         /* This will disable recovery and flush any recovery work. */
1929         ocfs2_recovery_exit(osb);
1930 
1931         ocfs2_journal_shutdown(osb);
1932 
1933         ocfs2_sync_blockdev(sb);
1934 
1935         ocfs2_purge_refcount_trees(osb);
1936 
1937         /* No cluster connection means we've failed during mount, so skip
1938          * all the steps which depended on that to complete. */
1939         if (osb->cconn) {
1940                 tmp = ocfs2_super_lock(osb, 1);
1941                 if (tmp < 0) {
1942                         mlog_errno(tmp);
1943                         return;
1944                 }
1945         }
1946 
1947         if (osb->slot_num != OCFS2_INVALID_SLOT)
1948                 ocfs2_put_slot(osb);
1949 
1950         if (osb->cconn)
1951                 ocfs2_super_unlock(osb, 1);
1952 
1953         ocfs2_release_system_inodes(osb);
1954 
1955         /*
1956          * If we're dismounting due to mount error, mount.ocfs2 will clean
1957          * up heartbeat.  If we're a local mount, there is no heartbeat.
1958          * If we failed before we got a uuid_str yet, we can't stop
1959          * heartbeat.  Otherwise, do it.
1960          */
1961         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1962             !ocfs2_is_hard_readonly(osb))
1963                 hangup_needed = 1;
1964 
1965         if (osb->cconn)
1966                 ocfs2_dlm_shutdown(osb, hangup_needed);
1967 
1968         ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1969         debugfs_remove(osb->osb_debug_root);
1970 
1971         if (hangup_needed)
1972                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1973 
1974         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1975 
1976         if (ocfs2_mount_local(osb))
1977                 snprintf(nodestr, sizeof(nodestr), "local");
1978         else
1979                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1980 
1981         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1982                osb->dev_str, nodestr);
1983 
1984         ocfs2_delete_osb(osb);
1985         kfree(osb);
1986         sb->s_dev = 0;
1987         sb->s_fs_info = NULL;
1988 }
1989 
1990 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1991                                 unsigned uuid_bytes)
1992 {
1993         int i, ret;
1994         char *ptr;
1995 
1996         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1997 
1998         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1999         if (osb->uuid_str == NULL)
2000                 return -ENOMEM;
2001 
2002         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2003                 /* print with null */
2004                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
2005                 if (ret != 2) /* drop super cleans up */
2006                         return -EINVAL;
2007                 /* then only advance past the last char */
2008                 ptr += 2;
2009         }
2010 
2011         return 0;
2012 }
2013 
2014 /* Make sure entire volume is addressable by our journal.  Requires
2015    osb_clusters_at_boot to be valid and for the journal to have been
2016    initialized by ocfs2_journal_init(). */
2017 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2018 {
2019         int status = 0;
2020         u64 max_block =
2021                 ocfs2_clusters_to_blocks(osb->sb,
2022                                          osb->osb_clusters_at_boot) - 1;
2023 
2024         /* 32-bit block number is always OK. */
2025         if (max_block <= (u32)~0ULL)
2026                 goto out;
2027 
2028         /* Volume is "huge", so see if our journal is new enough to
2029            support it. */
2030         if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2031                                        OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2032               jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2033                                                JBD2_FEATURE_INCOMPAT_64BIT))) {
2034                 mlog(ML_ERROR, "The journal cannot address the entire volume. "
2035                      "Enable the 'block64' journal option with tunefs.ocfs2");
2036                 status = -EFBIG;
2037                 goto out;
2038         }
2039 
2040  out:
2041         return status;
2042 }
2043 
2044 static int ocfs2_initialize_super(struct super_block *sb,
2045                                   struct buffer_head *bh,
2046                                   int sector_size,
2047                                   struct ocfs2_blockcheck_stats *stats)
2048 {
2049         int status;
2050         int i, cbits, bbits;
2051         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2052         struct inode *inode = NULL;
2053         struct ocfs2_journal *journal;
2054         struct ocfs2_super *osb;
2055         u64 total_blocks;
2056 
2057         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2058         if (!osb) {
2059                 status = -ENOMEM;
2060                 mlog_errno(status);
2061                 goto bail;
2062         }
2063 
2064         sb->s_fs_info = osb;
2065         sb->s_op = &ocfs2_sops;
2066         sb->s_d_op = &ocfs2_dentry_ops;
2067         sb->s_export_op = &ocfs2_export_ops;
2068         sb->s_qcop = &dquot_quotactl_sysfile_ops;
2069         sb->dq_op = &ocfs2_quota_operations;
2070         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
2071         sb->s_xattr = ocfs2_xattr_handlers;
2072         sb->s_time_gran = 1;
2073         sb->s_flags |= MS_NOATIME;
2074         /* this is needed to support O_LARGEFILE */
2075         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2076         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2077         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2078         memcpy(sb->s_uuid, di->id2.i_super.s_uuid,
2079                sizeof(di->id2.i_super.s_uuid));
2080 
2081         osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2082 
2083         for (i = 0; i < 3; i++)
2084                 osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2085         osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2086 
2087         osb->sb = sb;
2088         /* Save off for ocfs2_rw_direct */
2089         osb->s_sectsize_bits = blksize_bits(sector_size);
2090         BUG_ON(!osb->s_sectsize_bits);
2091 
2092         spin_lock_init(&osb->dc_task_lock);
2093         init_waitqueue_head(&osb->dc_event);
2094         osb->dc_work_sequence = 0;
2095         osb->dc_wake_sequence = 0;
2096         INIT_LIST_HEAD(&osb->blocked_lock_list);
2097         osb->blocked_lock_count = 0;
2098         spin_lock_init(&osb->osb_lock);
2099         spin_lock_init(&osb->osb_xattr_lock);
2100         ocfs2_init_steal_slots(osb);
2101 
2102         mutex_init(&osb->system_file_mutex);
2103 
2104         atomic_set(&osb->alloc_stats.moves, 0);
2105         atomic_set(&osb->alloc_stats.local_data, 0);
2106         atomic_set(&osb->alloc_stats.bitmap_data, 0);
2107         atomic_set(&osb->alloc_stats.bg_allocs, 0);
2108         atomic_set(&osb->alloc_stats.bg_extends, 0);
2109 
2110         /* Copy the blockcheck stats from the superblock probe */
2111         osb->osb_ecc_stats = *stats;
2112 
2113         ocfs2_init_node_maps(osb);
2114 
2115         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2116                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2117 
2118         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2119         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2120                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2121                      osb->max_slots);
2122                 status = -EINVAL;
2123                 goto bail;
2124         }
2125 
2126         ocfs2_orphan_scan_init(osb);
2127 
2128         status = ocfs2_recovery_init(osb);
2129         if (status) {
2130                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
2131                 mlog_errno(status);
2132                 goto bail;
2133         }
2134 
2135         init_waitqueue_head(&osb->checkpoint_event);
2136 
2137         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2138 
2139         osb->slot_num = OCFS2_INVALID_SLOT;
2140 
2141         osb->s_xattr_inline_size = le16_to_cpu(
2142                                         di->id2.i_super.s_xattr_inline_size);
2143 
2144         osb->local_alloc_state = OCFS2_LA_UNUSED;
2145         osb->local_alloc_bh = NULL;
2146         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2147 
2148         init_waitqueue_head(&osb->osb_mount_event);
2149 
2150         status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2151         if (status) {
2152                 mlog_errno(status);
2153                 goto bail;
2154         }
2155 
2156         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2157         if (!osb->vol_label) {
2158                 mlog(ML_ERROR, "unable to alloc vol label\n");
2159                 status = -ENOMEM;
2160                 goto bail;
2161         }
2162 
2163         osb->slot_recovery_generations =
2164                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2165                         GFP_KERNEL);
2166         if (!osb->slot_recovery_generations) {
2167                 status = -ENOMEM;
2168                 mlog_errno(status);
2169                 goto bail;
2170         }
2171 
2172         init_waitqueue_head(&osb->osb_wipe_event);
2173         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2174                                         sizeof(*osb->osb_orphan_wipes),
2175                                         GFP_KERNEL);
2176         if (!osb->osb_orphan_wipes) {
2177                 status = -ENOMEM;
2178                 mlog_errno(status);
2179                 goto bail;
2180         }
2181 
2182         osb->osb_rf_lock_tree = RB_ROOT;
2183 
2184         osb->s_feature_compat =
2185                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2186         osb->s_feature_ro_compat =
2187                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2188         osb->s_feature_incompat =
2189                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2190 
2191         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2192                 mlog(ML_ERROR, "couldn't mount because of unsupported "
2193                      "optional features (%x).\n", i);
2194                 status = -EINVAL;
2195                 goto bail;
2196         }
2197         if (!(osb->sb->s_flags & MS_RDONLY) &&
2198             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2199                 mlog(ML_ERROR, "couldn't mount RDWR because of "
2200                      "unsupported optional features (%x).\n", i);
2201                 status = -EINVAL;
2202                 goto bail;
2203         }
2204 
2205         if (ocfs2_clusterinfo_valid(osb)) {
2206                 osb->osb_stackflags =
2207                         OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2208                 strlcpy(osb->osb_cluster_stack,
2209                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2210                        OCFS2_STACK_LABEL_LEN + 1);
2211                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2212                         mlog(ML_ERROR,
2213                              "couldn't mount because of an invalid "
2214                              "cluster stack label (%s) \n",
2215                              osb->osb_cluster_stack);
2216                         status = -EINVAL;
2217                         goto bail;
2218                 }
2219                 strlcpy(osb->osb_cluster_name,
2220                         OCFS2_RAW_SB(di)->s_cluster_info.ci_cluster,
2221                         OCFS2_CLUSTER_NAME_LEN + 1);
2222         } else {
2223                 /* The empty string is identical with classic tools that
2224                  * don't know about s_cluster_info. */
2225                 osb->osb_cluster_stack[0] = '\0';
2226         }
2227 
2228         get_random_bytes(&osb->s_next_generation, sizeof(u32));
2229 
2230         /* FIXME
2231          * This should be done in ocfs2_journal_init(), but unknown
2232          * ordering issues will cause the filesystem to crash.
2233          * If anyone wants to figure out what part of the code
2234          * refers to osb->journal before ocfs2_journal_init() is run,
2235          * be my guest.
2236          */
2237         /* initialize our journal structure */
2238 
2239         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2240         if (!journal) {
2241                 mlog(ML_ERROR, "unable to alloc journal\n");
2242                 status = -ENOMEM;
2243                 goto bail;
2244         }
2245         osb->journal = journal;
2246         journal->j_osb = osb;
2247 
2248         atomic_set(&journal->j_num_trans, 0);
2249         init_rwsem(&journal->j_trans_barrier);
2250         init_waitqueue_head(&journal->j_checkpointed);
2251         spin_lock_init(&journal->j_lock);
2252         journal->j_trans_id = (unsigned long) 1;
2253         INIT_LIST_HEAD(&journal->j_la_cleanups);
2254         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2255         journal->j_state = OCFS2_JOURNAL_FREE;
2256 
2257         INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
2258         init_llist_head(&osb->dquot_drop_list);
2259 
2260         /* get some pseudo constants for clustersize bits */
2261         osb->s_clustersize_bits =
2262                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2263         osb->s_clustersize = 1 << osb->s_clustersize_bits;
2264 
2265         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2266             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2267                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2268                      osb->s_clustersize);
2269                 status = -EINVAL;
2270                 goto bail;
2271         }
2272 
2273         total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2274                                                 le32_to_cpu(di->i_clusters));
2275 
2276         status = generic_check_addressable(osb->sb->s_blocksize_bits,
2277                                            total_blocks);
2278         if (status) {
2279                 mlog(ML_ERROR, "Volume too large "
2280                      "to mount safely on this system");
2281                 status = -EFBIG;
2282                 goto bail;
2283         }
2284 
2285         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2286                                  sizeof(di->id2.i_super.s_uuid))) {
2287                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2288                 status = -ENOMEM;
2289                 goto bail;
2290         }
2291 
2292         strlcpy(osb->vol_label, di->id2.i_super.s_label,
2293                 OCFS2_MAX_VOL_LABEL_LEN);
2294         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2295         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2296         osb->first_cluster_group_blkno =
2297                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2298         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2299         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2300         trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2301                                      (unsigned long long)osb->root_blkno,
2302                                      (unsigned long long)osb->system_dir_blkno,
2303                                      osb->s_clustersize_bits);
2304 
2305         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2306         if (!osb->osb_dlm_debug) {
2307                 status = -ENOMEM;
2308                 mlog_errno(status);
2309                 goto bail;
2310         }
2311 
2312         atomic_set(&osb->vol_state, VOLUME_INIT);
2313 
2314         /* load root, system_dir, and all global system inodes */
2315         status = ocfs2_init_global_system_inodes(osb);
2316         if (status < 0) {
2317                 mlog_errno(status);
2318                 goto bail;
2319         }
2320 
2321         /*
2322          * global bitmap
2323          */
2324         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2325                                             OCFS2_INVALID_SLOT);
2326         if (!inode) {
2327                 status = -EINVAL;
2328                 mlog_errno(status);
2329                 goto bail;
2330         }
2331 
2332         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2333         osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2334         iput(inode);
2335 
2336         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2337                                  osb->s_feature_incompat) * 8;
2338 
2339         status = ocfs2_init_slot_info(osb);
2340         if (status < 0) {
2341                 mlog_errno(status);
2342                 goto bail;
2343         }
2344         cleancache_init_shared_fs(sb);
2345 
2346 bail:
2347         return status;
2348 }
2349 
2350 /*
2351  * will return: -EAGAIN if it is ok to keep searching for superblocks
2352  *              -EINVAL if there is a bad superblock
2353  *              0 on success
2354  */
2355 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2356                                struct buffer_head *bh,
2357                                u32 blksz,
2358                                struct ocfs2_blockcheck_stats *stats)
2359 {
2360         int status = -EAGAIN;
2361 
2362         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2363                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2364                 /* We have to do a raw check of the feature here */
2365                 if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2366                     OCFS2_FEATURE_INCOMPAT_META_ECC) {
2367                         status = ocfs2_block_check_validate(bh->b_data,
2368                                                             bh->b_size,
2369                                                             &di->i_check,
2370                                                             stats);
2371                         if (status)
2372                                 goto out;
2373                 }
2374                 status = -EINVAL;
2375                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2376                         mlog(ML_ERROR, "found superblock with incorrect block "
2377                              "size: found %u, should be %u\n",
2378                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2379                                blksz);
2380                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2381                            OCFS2_MAJOR_REV_LEVEL ||
2382                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2383                            OCFS2_MINOR_REV_LEVEL) {
2384                         mlog(ML_ERROR, "found superblock with bad version: "
2385                              "found %u.%u, should be %u.%u\n",
2386                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
2387                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2388                              OCFS2_MAJOR_REV_LEVEL,
2389                              OCFS2_MINOR_REV_LEVEL);
2390                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2391                         mlog(ML_ERROR, "bad block number on superblock: "
2392                              "found %llu, should be %llu\n",
2393                              (unsigned long long)le64_to_cpu(di->i_blkno),
2394                              (unsigned long long)bh->b_blocknr);
2395                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2396                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2397                         mlog(ML_ERROR, "bad cluster size found: %u\n",
2398                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2399                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2400                         mlog(ML_ERROR, "bad root_blkno: 0\n");
2401                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2402                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2403                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2404                         mlog(ML_ERROR,
2405                              "Superblock slots found greater than file system "
2406                              "maximum: found %u, max %u\n",
2407                              le16_to_cpu(di->id2.i_super.s_max_slots),
2408                              OCFS2_MAX_SLOTS);
2409                 } else {
2410                         /* found it! */
2411                         status = 0;
2412                 }
2413         }
2414 
2415 out:
2416         if (status && status != -EAGAIN)
2417                 mlog_errno(status);
2418         return status;
2419 }
2420 
2421 static int ocfs2_check_volume(struct ocfs2_super *osb)
2422 {
2423         int status;
2424         int dirty;
2425         int local;
2426         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2427                                                   * recover
2428                                                   * ourselves. */
2429 
2430         /* Init our journal object. */
2431         status = ocfs2_journal_init(osb->journal, &dirty);
2432         if (status < 0) {
2433                 mlog(ML_ERROR, "Could not initialize journal!\n");
2434                 goto finally;
2435         }
2436 
2437         /* Now that journal has been initialized, check to make sure
2438            entire volume is addressable. */
2439         status = ocfs2_journal_addressable(osb);
2440         if (status)
2441                 goto finally;
2442 
2443         /* If the journal was unmounted cleanly then we don't want to
2444          * recover anything. Otherwise, journal_load will do that
2445          * dirty work for us :) */
2446         if (!dirty) {
2447                 status = ocfs2_journal_wipe(osb->journal, 0);
2448                 if (status < 0) {
2449                         mlog_errno(status);
2450                         goto finally;
2451                 }
2452         } else {
2453                 printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2454                        "unmounted cleanly, recovering it.\n", osb->dev_str);
2455         }
2456 
2457         local = ocfs2_mount_local(osb);
2458 
2459         /* will play back anything left in the journal. */
2460         status = ocfs2_journal_load(osb->journal, local, dirty);
2461         if (status < 0) {
2462                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2463                 goto finally;
2464         }
2465 
2466         if (osb->s_mount_opt & OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT)
2467                 jbd2_journal_set_features(osb->journal->j_journal,
2468                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2469                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2470         else
2471                 jbd2_journal_clear_features(osb->journal->j_journal,
2472                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2473                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2474 
2475         if (dirty) {
2476                 /* recover my local alloc if we didn't unmount cleanly. */
2477                 status = ocfs2_begin_local_alloc_recovery(osb,
2478                                                           osb->slot_num,
2479                                                           &local_alloc);
2480                 if (status < 0) {
2481                         mlog_errno(status);
2482                         goto finally;
2483                 }
2484                 /* we complete the recovery process after we've marked
2485                  * ourselves as mounted. */
2486         }
2487 
2488         status = ocfs2_load_local_alloc(osb);
2489         if (status < 0) {
2490                 mlog_errno(status);
2491                 goto finally;
2492         }
2493 
2494         if (dirty) {
2495                 /* Recovery will be completed after we've mounted the
2496                  * rest of the volume. */
2497                 osb->dirty = 1;
2498                 osb->local_alloc_copy = local_alloc;
2499                 local_alloc = NULL;
2500         }
2501 
2502         /* go through each journal, trylock it and if you get the
2503          * lock, and it's marked as dirty, set the bit in the recover
2504          * map and launch a recovery thread for it. */
2505         status = ocfs2_mark_dead_nodes(osb);
2506         if (status < 0) {
2507                 mlog_errno(status);
2508                 goto finally;
2509         }
2510 
2511         status = ocfs2_compute_replay_slots(osb);
2512         if (status < 0)
2513                 mlog_errno(status);
2514 
2515 finally:
2516         kfree(local_alloc);
2517 
2518         if (status)
2519                 mlog_errno(status);
2520         return status;
2521 }
2522 
2523 /*
2524  * The routine gets called from dismount or close whenever a dismount on
2525  * volume is requested and the osb open count becomes 1.
2526  * It will remove the osb from the global list and also free up all the
2527  * initialized resources and fileobject.
2528  */
2529 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2530 {
2531         /* This function assumes that the caller has the main osb resource */
2532 
2533         ocfs2_free_slot_info(osb);
2534 
2535         kfree(osb->osb_orphan_wipes);
2536         kfree(osb->slot_recovery_generations);
2537         /* FIXME
2538          * This belongs in journal shutdown, but because we have to
2539          * allocate osb->journal at the start of ocfs2_initialize_osb(),
2540          * we free it here.
2541          */
2542         kfree(osb->journal);
2543         kfree(osb->local_alloc_copy);
2544         kfree(osb->uuid_str);
2545         kfree(osb->vol_label);
2546         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2547         memset(osb, 0, sizeof(struct ocfs2_super));
2548 }
2549 
2550 /* Depending on the mount option passed, perform one of the following:
2551  * Put OCFS2 into a readonly state (default)
2552  * Return EIO so that only the process errs
2553  * Fix the error as if fsck.ocfs2 -y
2554  * panic
2555  */
2556 static int ocfs2_handle_error(struct super_block *sb)
2557 {
2558         struct ocfs2_super *osb = OCFS2_SB(sb);
2559         int rv = 0;
2560 
2561         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2562         pr_crit("On-disk corruption discovered. "
2563                 "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
2564 
2565         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
2566                 panic("OCFS2: (device %s): panic forced after error\n",
2567                       sb->s_id);
2568         } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
2569                 pr_crit("OCFS2: Returning error to the calling process.\n");
2570                 rv = -EIO;
2571         } else { /* default option */
2572                 rv = -EROFS;
2573                 if (sb->s_flags & MS_RDONLY &&
2574                                 (ocfs2_is_soft_readonly(osb) ||
2575                                  ocfs2_is_hard_readonly(osb)))
2576                         return rv;
2577 
2578                 pr_crit("OCFS2: File system is now read-only.\n");
2579                 sb->s_flags |= MS_RDONLY;
2580                 ocfs2_set_ro_flag(osb, 0);
2581         }
2582 
2583         return rv;
2584 }
2585 
2586 int __ocfs2_error(struct super_block *sb, const char *function,
2587                   const char *fmt, ...)
2588 {
2589         struct va_format vaf;
2590         va_list args;
2591 
2592         va_start(args, fmt);
2593         vaf.fmt = fmt;
2594         vaf.va = &args;
2595 
2596         /* Not using mlog here because we want to show the actual
2597          * function the error came from. */
2598         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %pV",
2599                sb->s_id, function, &vaf);
2600 
2601         va_end(args);
2602 
2603         return ocfs2_handle_error(sb);
2604 }
2605 
2606 /* Handle critical errors. This is intentionally more drastic than
2607  * ocfs2_handle_error, so we only use for things like journal errors,
2608  * etc. */
2609 void __ocfs2_abort(struct super_block *sb, const char *function,
2610                    const char *fmt, ...)
2611 {
2612         struct va_format vaf;
2613         va_list args;
2614 
2615         va_start(args, fmt);
2616 
2617         vaf.fmt = fmt;
2618         vaf.va = &args;
2619 
2620         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %pV",
2621                sb->s_id, function, &vaf);
2622 
2623         va_end(args);
2624 
2625         /* We don't have the cluster support yet to go straight to
2626          * hard readonly in here. Until then, we want to keep
2627          * ocfs2_abort() so that we can at least mark critical
2628          * errors.
2629          *
2630          * TODO: This should abort the journal and alert other nodes
2631          * that our slot needs recovery. */
2632 
2633         /* Force a panic(). This stinks, but it's better than letting
2634          * things continue without having a proper hard readonly
2635          * here. */
2636         if (!ocfs2_mount_local(OCFS2_SB(sb)))
2637                 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2638         ocfs2_handle_error(sb);
2639 }
2640 
2641 /*
2642  * Void signal blockers, because in-kernel sigprocmask() only fails
2643  * when SIG_* is wrong.
2644  */
2645 void ocfs2_block_signals(sigset_t *oldset)
2646 {
2647         int rc;
2648         sigset_t blocked;
2649 
2650         sigfillset(&blocked);
2651         rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2652         BUG_ON(rc);
2653 }
2654 
2655 void ocfs2_unblock_signals(sigset_t *oldset)
2656 {
2657         int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2658         BUG_ON(rc);
2659 }
2660 
2661 module_init(ocfs2_init);
2662 module_exit(ocfs2_exit);
2663 

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