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super.c
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1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * super.c
5  *
6  * load/unload driver, mount/dismount volumes
7  *
8  * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public
12  * License as published by the Free Software Foundation; either
13  * version 2 of the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public
21  * License along with this program; if not, write to the
22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23  * Boston, MA 021110-1307, USA.
24  */
25 
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/init.h>
32 #include <linux/random.h>
33 #include <linux/statfs.h>
34 #include <linux/moduleparam.h>
35 #include <linux/blkdev.h>
36 #include <linux/socket.h>
37 #include <linux/inet.h>
38 #include <linux/parser.h>
39 #include <linux/crc32.h>
40 #include <linux/debugfs.h>
41 #include <linux/mount.h>
42 #include <linux/seq_file.h>
43 #include <linux/quotaops.h>
44 #include <linux/cleancache.h>
45 
46 #define CREATE_TRACE_POINTS
47 #include "ocfs2_trace.h"
48 
49 #include <cluster/masklog.h>
50 
51 #include "ocfs2.h"
52 
53 /* this should be the only file to include a version 1 header */
54 #include "ocfs1_fs_compat.h"
55 
56 #include "alloc.h"
57 #include "aops.h"
58 #include "blockcheck.h"
59 #include "dlmglue.h"
60 #include "export.h"
61 #include "extent_map.h"
62 #include "heartbeat.h"
63 #include "inode.h"
64 #include "journal.h"
65 #include "localalloc.h"
66 #include "namei.h"
67 #include "slot_map.h"
68 #include "super.h"
69 #include "sysfile.h"
70 #include "uptodate.h"
71 #include "ver.h"
72 #include "xattr.h"
73 #include "quota.h"
74 #include "refcounttree.h"
75 #include "suballoc.h"
76 
77 #include "buffer_head_io.h"
78 
79 static struct kmem_cache *ocfs2_inode_cachep = NULL;
80 struct kmem_cache *ocfs2_dquot_cachep;
81 struct kmem_cache *ocfs2_qf_chunk_cachep;
82 
83 /* OCFS2 needs to schedule several different types of work which
84  * require cluster locking, disk I/O, recovery waits, etc. Since these
85  * types of work tend to be heavy we avoid using the kernel events
86  * workqueue and schedule on our own. */
87 struct workqueue_struct *ocfs2_wq = NULL;
88 
89 static struct dentry *ocfs2_debugfs_root = NULL;
90 
91 MODULE_AUTHOR("Oracle");
92 MODULE_LICENSE("GPL");
93 
94 struct mount_options
95 {
96  unsigned long commit_interval;
97  unsigned long mount_opt;
98  unsigned int atime_quantum;
99  signed short slot;
100  int localalloc_opt;
101  unsigned int resv_level;
102  int dir_resv_level;
103  char cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
104 };
105 
106 static int ocfs2_parse_options(struct super_block *sb, char *options,
107  struct mount_options *mopt,
108  int is_remount);
109 static int ocfs2_check_set_options(struct super_block *sb,
110  struct mount_options *options);
111 static int ocfs2_show_options(struct seq_file *s, struct dentry *root);
112 static void ocfs2_put_super(struct super_block *sb);
113 static int ocfs2_mount_volume(struct super_block *sb);
114 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
115 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
116 static int ocfs2_initialize_mem_caches(void);
117 static void ocfs2_free_mem_caches(void);
118 static void ocfs2_delete_osb(struct ocfs2_super *osb);
119 
120 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
121 
122 static int ocfs2_sync_fs(struct super_block *sb, int wait);
123 
124 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
125 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
126 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
127 static int ocfs2_check_volume(struct ocfs2_super *osb);
128 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
129  struct buffer_head *bh,
130  u32 sectsize,
131  struct ocfs2_blockcheck_stats *stats);
132 static int ocfs2_initialize_super(struct super_block *sb,
133  struct buffer_head *bh,
134  int sector_size,
135  struct ocfs2_blockcheck_stats *stats);
136 static int ocfs2_get_sector(struct super_block *sb,
137  struct buffer_head **bh,
138  int block,
139  int sect_size);
140 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
141 static void ocfs2_destroy_inode(struct inode *inode);
142 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
143 static int ocfs2_enable_quotas(struct ocfs2_super *osb);
144 static void ocfs2_disable_quotas(struct ocfs2_super *osb);
145 
146 static const struct super_operations ocfs2_sops = {
147  .statfs = ocfs2_statfs,
148  .alloc_inode = ocfs2_alloc_inode,
149  .destroy_inode = ocfs2_destroy_inode,
150  .drop_inode = ocfs2_drop_inode,
151  .evict_inode = ocfs2_evict_inode,
152  .sync_fs = ocfs2_sync_fs,
153  .put_super = ocfs2_put_super,
154  .remount_fs = ocfs2_remount,
155  .show_options = ocfs2_show_options,
156  .quota_read = ocfs2_quota_read,
157  .quota_write = ocfs2_quota_write,
158 };
159 
160 enum {
161  Opt_barrier,
162  Opt_err_panic,
163  Opt_err_ro,
164  Opt_intr,
165  Opt_nointr,
166  Opt_hb_none,
167  Opt_hb_local,
168  Opt_hb_global,
169  Opt_data_ordered,
170  Opt_data_writeback,
171  Opt_atime_quantum,
172  Opt_slot,
173  Opt_commit,
174  Opt_localalloc,
175  Opt_localflocks,
176  Opt_stack,
177  Opt_user_xattr,
178  Opt_nouser_xattr,
179  Opt_inode64,
180  Opt_acl,
181  Opt_noacl,
182  Opt_usrquota,
183  Opt_grpquota,
184  Opt_coherency_buffered,
185  Opt_coherency_full,
186  Opt_resv_level,
187  Opt_dir_resv_level,
188  Opt_err,
189 };
190 
191 static const match_table_t tokens = {
192  {Opt_barrier, "barrier=%u"},
193  {Opt_err_panic, "errors=panic"},
194  {Opt_err_ro, "errors=remount-ro"},
195  {Opt_intr, "intr"},
196  {Opt_nointr, "nointr"},
197  {Opt_hb_none, OCFS2_HB_NONE},
198  {Opt_hb_local, OCFS2_HB_LOCAL},
199  {Opt_hb_global, OCFS2_HB_GLOBAL},
200  {Opt_data_ordered, "data=ordered"},
201  {Opt_data_writeback, "data=writeback"},
202  {Opt_atime_quantum, "atime_quantum=%u"},
203  {Opt_slot, "preferred_slot=%u"},
204  {Opt_commit, "commit=%u"},
205  {Opt_localalloc, "localalloc=%d"},
206  {Opt_localflocks, "localflocks"},
207  {Opt_stack, "cluster_stack=%s"},
208  {Opt_user_xattr, "user_xattr"},
209  {Opt_nouser_xattr, "nouser_xattr"},
210  {Opt_inode64, "inode64"},
211  {Opt_acl, "acl"},
212  {Opt_noacl, "noacl"},
213  {Opt_usrquota, "usrquota"},
214  {Opt_grpquota, "grpquota"},
215  {Opt_coherency_buffered, "coherency=buffered"},
216  {Opt_coherency_full, "coherency=full"},
217  {Opt_resv_level, "resv_level=%u"},
218  {Opt_dir_resv_level, "dir_resv_level=%u"},
219  {Opt_err, NULL}
220 };
221 
222 #ifdef CONFIG_DEBUG_FS
223 static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
224 {
225  struct ocfs2_cluster_connection *cconn = osb->cconn;
226  struct ocfs2_recovery_map *rm = osb->recovery_map;
227  struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
228  int i, out = 0;
229 
230  out += snprintf(buf + out, len - out,
231  "%10s => Id: %-s Uuid: %-s Gen: 0x%X Label: %-s\n",
232  "Device", osb->dev_str, osb->uuid_str,
233  osb->fs_generation, osb->vol_label);
234 
235  out += snprintf(buf + out, len - out,
236  "%10s => State: %d Flags: 0x%lX\n", "Volume",
237  atomic_read(&osb->vol_state), osb->osb_flags);
238 
239  out += snprintf(buf + out, len - out,
240  "%10s => Block: %lu Cluster: %d\n", "Sizes",
241  osb->sb->s_blocksize, osb->s_clustersize);
242 
243  out += snprintf(buf + out, len - out,
244  "%10s => Compat: 0x%X Incompat: 0x%X "
245  "ROcompat: 0x%X\n",
246  "Features", osb->s_feature_compat,
247  osb->s_feature_incompat, osb->s_feature_ro_compat);
248 
249  out += snprintf(buf + out, len - out,
250  "%10s => Opts: 0x%lX AtimeQuanta: %u\n", "Mount",
251  osb->s_mount_opt, osb->s_atime_quantum);
252 
253  if (cconn) {
254  out += snprintf(buf + out, len - out,
255  "%10s => Stack: %s Name: %*s "
256  "Version: %d.%d\n", "Cluster",
257  (*osb->osb_cluster_stack == '\0' ?
258  "o2cb" : osb->osb_cluster_stack),
259  cconn->cc_namelen, cconn->cc_name,
260  cconn->cc_version.pv_major,
261  cconn->cc_version.pv_minor);
262  }
263 
264  spin_lock(&osb->dc_task_lock);
265  out += snprintf(buf + out, len - out,
266  "%10s => Pid: %d Count: %lu WakeSeq: %lu "
267  "WorkSeq: %lu\n", "DownCnvt",
268  (osb->dc_task ? task_pid_nr(osb->dc_task) : -1),
269  osb->blocked_lock_count, osb->dc_wake_sequence,
270  osb->dc_work_sequence);
271  spin_unlock(&osb->dc_task_lock);
272 
273  spin_lock(&osb->osb_lock);
274  out += snprintf(buf + out, len - out, "%10s => Pid: %d Nodes:",
275  "Recovery",
276  (osb->recovery_thread_task ?
277  task_pid_nr(osb->recovery_thread_task) : -1));
278  if (rm->rm_used == 0)
279  out += snprintf(buf + out, len - out, " None\n");
280  else {
281  for (i = 0; i < rm->rm_used; i++)
282  out += snprintf(buf + out, len - out, " %d",
283  rm->rm_entries[i]);
284  out += snprintf(buf + out, len - out, "\n");
285  }
286  spin_unlock(&osb->osb_lock);
287 
288  out += snprintf(buf + out, len - out,
289  "%10s => Pid: %d Interval: %lu Needs: %d\n", "Commit",
290  (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
291  osb->osb_commit_interval,
292  atomic_read(&osb->needs_checkpoint));
293 
294  out += snprintf(buf + out, len - out,
295  "%10s => State: %d TxnId: %lu NumTxns: %d\n",
296  "Journal", osb->journal->j_state,
297  osb->journal->j_trans_id,
298  atomic_read(&osb->journal->j_num_trans));
299 
300  out += snprintf(buf + out, len - out,
301  "%10s => GlobalAllocs: %d LocalAllocs: %d "
302  "SubAllocs: %d LAWinMoves: %d SAExtends: %d\n",
303  "Stats",
304  atomic_read(&osb->alloc_stats.bitmap_data),
305  atomic_read(&osb->alloc_stats.local_data),
306  atomic_read(&osb->alloc_stats.bg_allocs),
307  atomic_read(&osb->alloc_stats.moves),
308  atomic_read(&osb->alloc_stats.bg_extends));
309 
310  out += snprintf(buf + out, len - out,
311  "%10s => State: %u Descriptor: %llu Size: %u bits "
312  "Default: %u bits\n",
313  "LocalAlloc", osb->local_alloc_state,
314  (unsigned long long)osb->la_last_gd,
315  osb->local_alloc_bits, osb->local_alloc_default_bits);
316 
317  spin_lock(&osb->osb_lock);
318  out += snprintf(buf + out, len - out,
319  "%10s => InodeSlot: %d StolenInodes: %d, "
320  "MetaSlot: %d StolenMeta: %d\n", "Steal",
321  osb->s_inode_steal_slot,
322  atomic_read(&osb->s_num_inodes_stolen),
323  osb->s_meta_steal_slot,
324  atomic_read(&osb->s_num_meta_stolen));
325  spin_unlock(&osb->osb_lock);
326 
327  out += snprintf(buf + out, len - out, "OrphanScan => ");
328  out += snprintf(buf + out, len - out, "Local: %u Global: %u ",
329  os->os_count, os->os_seqno);
330  out += snprintf(buf + out, len - out, " Last Scan: ");
331  if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
332  out += snprintf(buf + out, len - out, "Disabled\n");
333  else
334  out += snprintf(buf + out, len - out, "%lu seconds ago\n",
335  (get_seconds() - os->os_scantime.tv_sec));
336 
337  out += snprintf(buf + out, len - out, "%10s => %3s %10s\n",
338  "Slots", "Num", "RecoGen");
339  for (i = 0; i < osb->max_slots; ++i) {
340  out += snprintf(buf + out, len - out,
341  "%10s %c %3d %10d\n",
342  " ",
343  (i == osb->slot_num ? '*' : ' '),
344  i, osb->slot_recovery_generations[i]);
345  }
346 
347  return out;
348 }
349 
350 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
351 {
352  struct ocfs2_super *osb = inode->i_private;
353  char *buf = NULL;
354 
355  buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
356  if (!buf)
357  goto bail;
358 
359  i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
360 
361  file->private_data = buf;
362 
363  return 0;
364 bail:
365  return -ENOMEM;
366 }
367 
368 static int ocfs2_debug_release(struct inode *inode, struct file *file)
369 {
370  kfree(file->private_data);
371  return 0;
372 }
373 
374 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
375  size_t nbytes, loff_t *ppos)
376 {
377  return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
378  i_size_read(file->f_mapping->host));
379 }
380 #else
381 static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
382 {
383  return 0;
384 }
385 static int ocfs2_debug_release(struct inode *inode, struct file *file)
386 {
387  return 0;
388 }
389 static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
390  size_t nbytes, loff_t *ppos)
391 {
392  return 0;
393 }
394 #endif /* CONFIG_DEBUG_FS */
395 
396 static const struct file_operations ocfs2_osb_debug_fops = {
397  .open = ocfs2_osb_debug_open,
398  .release = ocfs2_debug_release,
399  .read = ocfs2_debug_read,
400  .llseek = generic_file_llseek,
401 };
402 
403 static int ocfs2_sync_fs(struct super_block *sb, int wait)
404 {
405  int status;
406  tid_t target;
407  struct ocfs2_super *osb = OCFS2_SB(sb);
408 
409  if (ocfs2_is_hard_readonly(osb))
410  return -EROFS;
411 
412  if (wait) {
413  status = ocfs2_flush_truncate_log(osb);
414  if (status < 0)
415  mlog_errno(status);
416  } else {
417  ocfs2_schedule_truncate_log_flush(osb, 0);
418  }
419 
420  if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
421  &target)) {
422  if (wait)
423  jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
424  target);
425  }
426  return 0;
427 }
428 
429 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
430 {
431  if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
432  && (ino == USER_QUOTA_SYSTEM_INODE
433  || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
434  return 0;
435  if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
436  && (ino == GROUP_QUOTA_SYSTEM_INODE
437  || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
438  return 0;
439  return 1;
440 }
441 
442 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
443 {
444  struct inode *new = NULL;
445  int status = 0;
446  int i;
447 
448  new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
449  if (IS_ERR(new)) {
450  status = PTR_ERR(new);
451  mlog_errno(status);
452  goto bail;
453  }
454  osb->root_inode = new;
455 
456  new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
457  if (IS_ERR(new)) {
458  status = PTR_ERR(new);
459  mlog_errno(status);
460  goto bail;
461  }
462  osb->sys_root_inode = new;
463 
464  for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
465  i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
466  if (!ocfs2_need_system_inode(osb, i))
467  continue;
468  new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
469  if (!new) {
470  ocfs2_release_system_inodes(osb);
471  status = -EINVAL;
472  mlog_errno(status);
473  /* FIXME: Should ERROR_RO_FS */
474  mlog(ML_ERROR, "Unable to load system inode %d, "
475  "possibly corrupt fs?", i);
476  goto bail;
477  }
478  // the array now has one ref, so drop this one
479  iput(new);
480  }
481 
482 bail:
483  if (status)
484  mlog_errno(status);
485  return status;
486 }
487 
488 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
489 {
490  struct inode *new = NULL;
491  int status = 0;
492  int i;
493 
494  for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
495  i < NUM_SYSTEM_INODES;
496  i++) {
497  if (!ocfs2_need_system_inode(osb, i))
498  continue;
499  new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
500  if (!new) {
501  ocfs2_release_system_inodes(osb);
502  status = -EINVAL;
503  mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
504  status, i, osb->slot_num);
505  goto bail;
506  }
507  /* the array now has one ref, so drop this one */
508  iput(new);
509  }
510 
511 bail:
512  if (status)
513  mlog_errno(status);
514  return status;
515 }
516 
517 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
518 {
519  int i;
520  struct inode *inode;
521 
522  for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
523  inode = osb->global_system_inodes[i];
524  if (inode) {
525  iput(inode);
526  osb->global_system_inodes[i] = NULL;
527  }
528  }
529 
530  inode = osb->sys_root_inode;
531  if (inode) {
532  iput(inode);
533  osb->sys_root_inode = NULL;
534  }
535 
536  inode = osb->root_inode;
537  if (inode) {
538  iput(inode);
539  osb->root_inode = NULL;
540  }
541 
542  if (!osb->local_system_inodes)
543  return;
544 
545  for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
546  if (osb->local_system_inodes[i]) {
547  iput(osb->local_system_inodes[i]);
548  osb->local_system_inodes[i] = NULL;
549  }
550  }
551 
552  kfree(osb->local_system_inodes);
553  osb->local_system_inodes = NULL;
554 }
555 
556 /* We're allocating fs objects, use GFP_NOFS */
557 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
558 {
559  struct ocfs2_inode_info *oi;
560 
561  oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
562  if (!oi)
563  return NULL;
564 
565  jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
566  return &oi->vfs_inode;
567 }
568 
569 static void ocfs2_i_callback(struct rcu_head *head)
570 {
571  struct inode *inode = container_of(head, struct inode, i_rcu);
572  kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
573 }
574 
575 static void ocfs2_destroy_inode(struct inode *inode)
576 {
577  call_rcu(&inode->i_rcu, ocfs2_i_callback);
578 }
579 
580 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
581  unsigned int cbits)
582 {
583  unsigned int bytes = 1 << cbits;
584  unsigned int trim = bytes;
585  unsigned int bitshift = 32;
586 
587  /*
588  * i_size and all block offsets in ocfs2 are always 64 bits
589  * wide. i_clusters is 32 bits, in cluster-sized units. So on
590  * 64 bit platforms, cluster size will be the limiting factor.
591  */
592 
593 #if BITS_PER_LONG == 32
594 # if defined(CONFIG_LBDAF)
595  BUILD_BUG_ON(sizeof(sector_t) != 8);
596  /*
597  * We might be limited by page cache size.
598  */
599  if (bytes > PAGE_CACHE_SIZE) {
600  bytes = PAGE_CACHE_SIZE;
601  trim = 1;
602  /*
603  * Shift by 31 here so that we don't get larger than
604  * MAX_LFS_FILESIZE
605  */
606  bitshift = 31;
607  }
608 # else
609  /*
610  * We are limited by the size of sector_t. Use block size, as
611  * that's what we expose to the VFS.
612  */
613  bytes = 1 << bbits;
614  trim = 1;
615  bitshift = 31;
616 # endif
617 #endif
618 
619  /*
620  * Trim by a whole cluster when we can actually approach the
621  * on-disk limits. Otherwise we can overflow i_clusters when
622  * an extent start is at the max offset.
623  */
624  return (((unsigned long long)bytes) << bitshift) - trim;
625 }
626 
627 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
628 {
629  int incompat_features;
630  int ret = 0;
631  struct mount_options parsed_options;
632  struct ocfs2_super *osb = OCFS2_SB(sb);
633  u32 tmp;
634 
635  if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
636  !ocfs2_check_set_options(sb, &parsed_options)) {
637  ret = -EINVAL;
638  goto out;
639  }
640 
641  tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
642  OCFS2_MOUNT_HB_NONE;
643  if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
644  ret = -EINVAL;
645  mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
646  goto out;
647  }
648 
649  if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
650  (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
651  ret = -EINVAL;
652  mlog(ML_ERROR, "Cannot change data mode on remount\n");
653  goto out;
654  }
655 
656  /* Probably don't want this on remount; it might
657  * mess with other nodes */
658  if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
659  (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
660  ret = -EINVAL;
661  mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
662  goto out;
663  }
664 
665  /* We're going to/from readonly mode. */
666  if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
667  /* Disable quota accounting before remounting RO */
668  if (*flags & MS_RDONLY) {
669  ret = ocfs2_susp_quotas(osb, 0);
670  if (ret < 0)
671  goto out;
672  }
673  /* Lock here so the check of HARD_RO and the potential
674  * setting of SOFT_RO is atomic. */
675  spin_lock(&osb->osb_lock);
676  if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
677  mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
678  ret = -EROFS;
679  goto unlock_osb;
680  }
681 
682  if (*flags & MS_RDONLY) {
683  sb->s_flags |= MS_RDONLY;
684  osb->osb_flags |= OCFS2_OSB_SOFT_RO;
685  } else {
686  if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
687  mlog(ML_ERROR, "Cannot remount RDWR "
688  "filesystem due to previous errors.\n");
689  ret = -EROFS;
690  goto unlock_osb;
691  }
692  incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
693  if (incompat_features) {
694  mlog(ML_ERROR, "Cannot remount RDWR because "
695  "of unsupported optional features "
696  "(%x).\n", incompat_features);
697  ret = -EINVAL;
698  goto unlock_osb;
699  }
700  sb->s_flags &= ~MS_RDONLY;
701  osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
702  }
703  trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
704 unlock_osb:
705  spin_unlock(&osb->osb_lock);
706  /* Enable quota accounting after remounting RW */
707  if (!ret && !(*flags & MS_RDONLY)) {
708  if (sb_any_quota_suspended(sb))
709  ret = ocfs2_susp_quotas(osb, 1);
710  else
711  ret = ocfs2_enable_quotas(osb);
712  if (ret < 0) {
713  /* Return back changes... */
714  spin_lock(&osb->osb_lock);
715  sb->s_flags |= MS_RDONLY;
716  osb->osb_flags |= OCFS2_OSB_SOFT_RO;
717  spin_unlock(&osb->osb_lock);
718  goto out;
719  }
720  }
721  }
722 
723  if (!ret) {
724  /* Only save off the new mount options in case of a successful
725  * remount. */
726  osb->s_mount_opt = parsed_options.mount_opt;
727  osb->s_atime_quantum = parsed_options.atime_quantum;
728  osb->preferred_slot = parsed_options.slot;
729  if (parsed_options.commit_interval)
730  osb->osb_commit_interval = parsed_options.commit_interval;
731 
732  if (!ocfs2_is_hard_readonly(osb))
733  ocfs2_set_journal_params(osb);
734 
735  sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
736  ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
737  MS_POSIXACL : 0);
738  }
739 out:
740  return ret;
741 }
742 
743 static int ocfs2_sb_probe(struct super_block *sb,
744  struct buffer_head **bh,
745  int *sector_size,
746  struct ocfs2_blockcheck_stats *stats)
747 {
748  int status, tmpstat;
749  struct ocfs1_vol_disk_hdr *hdr;
750  struct ocfs2_dinode *di;
751  int blksize;
752 
753  *bh = NULL;
754 
755  /* may be > 512 */
756  *sector_size = bdev_logical_block_size(sb->s_bdev);
757  if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
758  mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
759  *sector_size, OCFS2_MAX_BLOCKSIZE);
760  status = -EINVAL;
761  goto bail;
762  }
763 
764  /* Can this really happen? */
765  if (*sector_size < OCFS2_MIN_BLOCKSIZE)
766  *sector_size = OCFS2_MIN_BLOCKSIZE;
767 
768  /* check block zero for old format */
769  status = ocfs2_get_sector(sb, bh, 0, *sector_size);
770  if (status < 0) {
771  mlog_errno(status);
772  goto bail;
773  }
774  hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
775  if (hdr->major_version == OCFS1_MAJOR_VERSION) {
776  mlog(ML_ERROR, "incompatible version: %u.%u\n",
777  hdr->major_version, hdr->minor_version);
778  status = -EINVAL;
779  }
780  if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
781  strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
782  mlog(ML_ERROR, "incompatible volume signature: %8s\n",
783  hdr->signature);
784  status = -EINVAL;
785  }
786  brelse(*bh);
787  *bh = NULL;
788  if (status < 0) {
789  mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
790  "upgraded before mounting with ocfs v2\n");
791  goto bail;
792  }
793 
794  /*
795  * Now check at magic offset for 512, 1024, 2048, 4096
796  * blocksizes. 4096 is the maximum blocksize because it is
797  * the minimum clustersize.
798  */
799  status = -EINVAL;
800  for (blksize = *sector_size;
801  blksize <= OCFS2_MAX_BLOCKSIZE;
802  blksize <<= 1) {
803  tmpstat = ocfs2_get_sector(sb, bh,
804  OCFS2_SUPER_BLOCK_BLKNO,
805  blksize);
806  if (tmpstat < 0) {
807  status = tmpstat;
808  mlog_errno(status);
809  break;
810  }
811  di = (struct ocfs2_dinode *) (*bh)->b_data;
812  memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
813  spin_lock_init(&stats->b_lock);
814  tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
815  if (tmpstat < 0) {
816  brelse(*bh);
817  *bh = NULL;
818  }
819  if (tmpstat != -EAGAIN) {
820  status = tmpstat;
821  break;
822  }
823  }
824 
825 bail:
826  return status;
827 }
828 
829 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
830 {
831  u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
832 
833  if (osb->s_mount_opt & hb_enabled) {
834  if (ocfs2_mount_local(osb)) {
835  mlog(ML_ERROR, "Cannot heartbeat on a locally "
836  "mounted device.\n");
837  return -EINVAL;
838  }
839  if (ocfs2_userspace_stack(osb)) {
840  mlog(ML_ERROR, "Userspace stack expected, but "
841  "o2cb heartbeat arguments passed to mount\n");
842  return -EINVAL;
843  }
844  if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
845  !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
846  ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
847  ocfs2_cluster_o2cb_global_heartbeat(osb))) {
848  mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
849  return -EINVAL;
850  }
851  }
852 
853  if (!(osb->s_mount_opt & hb_enabled)) {
854  if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
855  !ocfs2_userspace_stack(osb)) {
856  mlog(ML_ERROR, "Heartbeat has to be started to mount "
857  "a read-write clustered device.\n");
858  return -EINVAL;
859  }
860  }
861 
862  return 0;
863 }
864 
865 /*
866  * If we're using a userspace stack, mount should have passed
867  * a name that matches the disk. If not, mount should not
868  * have passed a stack.
869  */
870 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
871  struct mount_options *mopt)
872 {
873  if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
874  mlog(ML_ERROR,
875  "cluster stack passed to mount, but this filesystem "
876  "does not support it\n");
877  return -EINVAL;
878  }
879 
880  if (ocfs2_userspace_stack(osb) &&
881  strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
882  OCFS2_STACK_LABEL_LEN)) {
883  mlog(ML_ERROR,
884  "cluster stack passed to mount (\"%s\") does not "
885  "match the filesystem (\"%s\")\n",
886  mopt->cluster_stack,
887  osb->osb_cluster_stack);
888  return -EINVAL;
889  }
890 
891  return 0;
892 }
893 
894 static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
895 {
896  int type;
897  struct super_block *sb = osb->sb;
898  unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
899  OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
900  int status = 0;
901 
902  for (type = 0; type < MAXQUOTAS; type++) {
903  if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
904  continue;
905  if (unsuspend)
906  status = dquot_resume(sb, type);
907  else {
908  struct ocfs2_mem_dqinfo *oinfo;
909 
910  /* Cancel periodic syncing before suspending */
911  oinfo = sb_dqinfo(sb, type)->dqi_priv;
912  cancel_delayed_work_sync(&oinfo->dqi_sync_work);
913  status = dquot_suspend(sb, type);
914  }
915  if (status < 0)
916  break;
917  }
918  if (status < 0)
919  mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
920  "remount (error = %d).\n", status);
921  return status;
922 }
923 
924 static int ocfs2_enable_quotas(struct ocfs2_super *osb)
925 {
926  struct inode *inode[MAXQUOTAS] = { NULL, NULL };
927  struct super_block *sb = osb->sb;
928  unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
929  OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
930  unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
931  LOCAL_GROUP_QUOTA_SYSTEM_INODE };
932  int status;
933  int type;
934 
935  sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
936  for (type = 0; type < MAXQUOTAS; type++) {
937  if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
938  continue;
939  inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
940  osb->slot_num);
941  if (!inode[type]) {
942  status = -ENOENT;
943  goto out_quota_off;
944  }
945  status = dquot_enable(inode[type], type, QFMT_OCFS2,
946  DQUOT_USAGE_ENABLED);
947  if (status < 0)
948  goto out_quota_off;
949  }
950 
951  for (type = 0; type < MAXQUOTAS; type++)
952  iput(inode[type]);
953  return 0;
954 out_quota_off:
955  ocfs2_disable_quotas(osb);
956  for (type = 0; type < MAXQUOTAS; type++)
957  iput(inode[type]);
958  mlog_errno(status);
959  return status;
960 }
961 
962 static void ocfs2_disable_quotas(struct ocfs2_super *osb)
963 {
964  int type;
965  struct inode *inode;
966  struct super_block *sb = osb->sb;
967  struct ocfs2_mem_dqinfo *oinfo;
968 
969  /* We mostly ignore errors in this function because there's not much
970  * we can do when we see them */
971  for (type = 0; type < MAXQUOTAS; type++) {
972  if (!sb_has_quota_loaded(sb, type))
973  continue;
974  /* Cancel periodic syncing before we grab dqonoff_mutex */
975  oinfo = sb_dqinfo(sb, type)->dqi_priv;
976  cancel_delayed_work_sync(&oinfo->dqi_sync_work);
977  inode = igrab(sb->s_dquot.files[type]);
978  /* Turn off quotas. This will remove all dquot structures from
979  * memory and so they will be automatically synced to global
980  * quota files */
981  dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
982  DQUOT_LIMITS_ENABLED);
983  if (!inode)
984  continue;
985  iput(inode);
986  }
987 }
988 
989 /* Handle quota on quotactl */
990 static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
991 {
992  unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
993  OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
994 
995  if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
996  return -EINVAL;
997 
998  return dquot_enable(sb_dqopt(sb)->files[type], type,
999  format_id, DQUOT_LIMITS_ENABLED);
1000 }
1001 
1002 /* Handle quota off quotactl */
1003 static int ocfs2_quota_off(struct super_block *sb, int type)
1004 {
1005  return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1006 }
1007 
1008 static const struct quotactl_ops ocfs2_quotactl_ops = {
1009  .quota_on_meta = ocfs2_quota_on,
1010  .quota_off = ocfs2_quota_off,
1011  .quota_sync = dquot_quota_sync,
1012  .get_info = dquot_get_dqinfo,
1013  .set_info = dquot_set_dqinfo,
1014  .get_dqblk = dquot_get_dqblk,
1015  .set_dqblk = dquot_set_dqblk,
1016 };
1017 
1018 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1019 {
1020  struct dentry *root;
1021  int status, sector_size;
1022  struct mount_options parsed_options;
1023  struct inode *inode = NULL;
1024  struct ocfs2_super *osb = NULL;
1025  struct buffer_head *bh = NULL;
1026  char nodestr[8];
1027  struct ocfs2_blockcheck_stats stats;
1028 
1029  trace_ocfs2_fill_super(sb, data, silent);
1030 
1031  if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1032  status = -EINVAL;
1033  goto read_super_error;
1034  }
1035 
1036  /* probe for superblock */
1037  status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1038  if (status < 0) {
1039  mlog(ML_ERROR, "superblock probe failed!\n");
1040  goto read_super_error;
1041  }
1042 
1043  status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1044  osb = OCFS2_SB(sb);
1045  if (status < 0) {
1046  mlog_errno(status);
1047  goto read_super_error;
1048  }
1049  brelse(bh);
1050  bh = NULL;
1051 
1052  if (!ocfs2_check_set_options(sb, &parsed_options)) {
1053  status = -EINVAL;
1054  goto read_super_error;
1055  }
1056  osb->s_mount_opt = parsed_options.mount_opt;
1057  osb->s_atime_quantum = parsed_options.atime_quantum;
1058  osb->preferred_slot = parsed_options.slot;
1059  osb->osb_commit_interval = parsed_options.commit_interval;
1060 
1061  ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1062  osb->osb_resv_level = parsed_options.resv_level;
1063  osb->osb_dir_resv_level = parsed_options.resv_level;
1064  if (parsed_options.dir_resv_level == -1)
1065  osb->osb_dir_resv_level = parsed_options.resv_level;
1066  else
1067  osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1068 
1069  status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1070  if (status)
1071  goto read_super_error;
1072 
1073  sb->s_magic = OCFS2_SUPER_MAGIC;
1074 
1075  sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1076  ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1077 
1078  /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1079  * heartbeat=none */
1080  if (bdev_read_only(sb->s_bdev)) {
1081  if (!(sb->s_flags & MS_RDONLY)) {
1082  status = -EACCES;
1083  mlog(ML_ERROR, "Readonly device detected but readonly "
1084  "mount was not specified.\n");
1085  goto read_super_error;
1086  }
1087 
1088  /* You should not be able to start a local heartbeat
1089  * on a readonly device. */
1090  if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1091  status = -EROFS;
1092  mlog(ML_ERROR, "Local heartbeat specified on readonly "
1093  "device.\n");
1094  goto read_super_error;
1095  }
1096 
1097  status = ocfs2_check_journals_nolocks(osb);
1098  if (status < 0) {
1099  if (status == -EROFS)
1100  mlog(ML_ERROR, "Recovery required on readonly "
1101  "file system, but write access is "
1102  "unavailable.\n");
1103  else
1104  mlog_errno(status);
1105  goto read_super_error;
1106  }
1107 
1108  ocfs2_set_ro_flag(osb, 1);
1109 
1110  printk(KERN_NOTICE "ocfs2: Readonly device (%s) detected. "
1111  "Cluster services will not be used for this mount. "
1112  "Recovery will be skipped.\n", osb->dev_str);
1113  }
1114 
1115  if (!ocfs2_is_hard_readonly(osb)) {
1116  if (sb->s_flags & MS_RDONLY)
1117  ocfs2_set_ro_flag(osb, 0);
1118  }
1119 
1120  status = ocfs2_verify_heartbeat(osb);
1121  if (status < 0) {
1122  mlog_errno(status);
1123  goto read_super_error;
1124  }
1125 
1126  osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1127  ocfs2_debugfs_root);
1128  if (!osb->osb_debug_root) {
1129  status = -EINVAL;
1130  mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1131  goto read_super_error;
1132  }
1133 
1134  osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1135  osb->osb_debug_root,
1136  osb,
1137  &ocfs2_osb_debug_fops);
1138  if (!osb->osb_ctxt) {
1139  status = -EINVAL;
1140  mlog_errno(status);
1141  goto read_super_error;
1142  }
1143 
1144  if (ocfs2_meta_ecc(osb)) {
1145  status = ocfs2_blockcheck_stats_debugfs_install(
1146  &osb->osb_ecc_stats,
1147  osb->osb_debug_root);
1148  if (status) {
1149  mlog(ML_ERROR,
1150  "Unable to create blockcheck statistics "
1151  "files\n");
1152  goto read_super_error;
1153  }
1154  }
1155 
1156  status = ocfs2_mount_volume(sb);
1157  if (status < 0)
1158  goto read_super_error;
1159 
1160  if (osb->root_inode)
1161  inode = igrab(osb->root_inode);
1162 
1163  if (!inode) {
1164  status = -EIO;
1165  mlog_errno(status);
1166  goto read_super_error;
1167  }
1168 
1169  root = d_make_root(inode);
1170  if (!root) {
1171  status = -ENOMEM;
1172  mlog_errno(status);
1173  goto read_super_error;
1174  }
1175 
1176  sb->s_root = root;
1177 
1178  ocfs2_complete_mount_recovery(osb);
1179 
1180  if (ocfs2_mount_local(osb))
1181  snprintf(nodestr, sizeof(nodestr), "local");
1182  else
1183  snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1184 
1185  printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1186  "with %s data mode.\n",
1187  osb->dev_str, nodestr, osb->slot_num,
1188  osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1189  "ordered");
1190 
1191  atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1192  wake_up(&osb->osb_mount_event);
1193 
1194  /* Now we can initialize quotas because we can afford to wait
1195  * for cluster locks recovery now. That also means that truncation
1196  * log recovery can happen but that waits for proper quota setup */
1197  if (!(sb->s_flags & MS_RDONLY)) {
1198  status = ocfs2_enable_quotas(osb);
1199  if (status < 0) {
1200  /* We have to err-out specially here because
1201  * s_root is already set */
1202  mlog_errno(status);
1203  atomic_set(&osb->vol_state, VOLUME_DISABLED);
1204  wake_up(&osb->osb_mount_event);
1205  return status;
1206  }
1207  }
1208 
1209  ocfs2_complete_quota_recovery(osb);
1210 
1211  /* Now we wake up again for processes waiting for quotas */
1212  atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1213  wake_up(&osb->osb_mount_event);
1214 
1215  /* Start this when the mount is almost sure of being successful */
1216  ocfs2_orphan_scan_start(osb);
1217 
1218  return status;
1219 
1220 read_super_error:
1221  brelse(bh);
1222 
1223  if (osb) {
1224  atomic_set(&osb->vol_state, VOLUME_DISABLED);
1225  wake_up(&osb->osb_mount_event);
1226  ocfs2_dismount_volume(sb, 1);
1227  }
1228 
1229  if (status)
1230  mlog_errno(status);
1231  return status;
1232 }
1233 
1234 static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1235  int flags,
1236  const char *dev_name,
1237  void *data)
1238 {
1239  return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1240 }
1241 
1242 static void ocfs2_kill_sb(struct super_block *sb)
1243 {
1244  struct ocfs2_super *osb = OCFS2_SB(sb);
1245 
1246  /* Failed mount? */
1247  if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1248  goto out;
1249 
1250  /* Prevent further queueing of inode drop events */
1251  spin_lock(&dentry_list_lock);
1252  ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1253  spin_unlock(&dentry_list_lock);
1254  /* Wait for work to finish and/or remove it */
1255  cancel_work_sync(&osb->dentry_lock_work);
1256 out:
1257  kill_block_super(sb);
1258 }
1259 
1260 static struct file_system_type ocfs2_fs_type = {
1261  .owner = THIS_MODULE,
1262  .name = "ocfs2",
1263  .mount = ocfs2_mount,
1264  .kill_sb = ocfs2_kill_sb,
1265 
1266  .fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1267  .next = NULL
1268 };
1269 
1270 static int ocfs2_check_set_options(struct super_block *sb,
1271  struct mount_options *options)
1272 {
1273  if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1274  !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1275  OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1276  mlog(ML_ERROR, "User quotas were requested, but this "
1277  "filesystem does not have the feature enabled.\n");
1278  return 0;
1279  }
1280  if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1281  !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1282  OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1283  mlog(ML_ERROR, "Group quotas were requested, but this "
1284  "filesystem does not have the feature enabled.\n");
1285  return 0;
1286  }
1287  if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1288  !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1289  mlog(ML_ERROR, "ACL support requested but extended attributes "
1290  "feature is not enabled\n");
1291  return 0;
1292  }
1293  /* No ACL setting specified? Use XATTR feature... */
1294  if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1295  OCFS2_MOUNT_NO_POSIX_ACL))) {
1296  if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1297  options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1298  else
1299  options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1300  }
1301  return 1;
1302 }
1303 
1304 static int ocfs2_parse_options(struct super_block *sb,
1305  char *options,
1306  struct mount_options *mopt,
1307  int is_remount)
1308 {
1309  int status, user_stack = 0;
1310  char *p;
1311  u32 tmp;
1312 
1313  trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1314 
1315  mopt->commit_interval = 0;
1316  mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1317  mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1318  mopt->slot = OCFS2_INVALID_SLOT;
1319  mopt->localalloc_opt = -1;
1320  mopt->cluster_stack[0] = '\0';
1321  mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1322  mopt->dir_resv_level = -1;
1323 
1324  if (!options) {
1325  status = 1;
1326  goto bail;
1327  }
1328 
1329  while ((p = strsep(&options, ",")) != NULL) {
1330  int token, option;
1331  substring_t args[MAX_OPT_ARGS];
1332 
1333  if (!*p)
1334  continue;
1335 
1336  token = match_token(p, tokens, args);
1337  switch (token) {
1338  case Opt_hb_local:
1339  mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1340  break;
1341  case Opt_hb_none:
1342  mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1343  break;
1344  case Opt_hb_global:
1345  mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1346  break;
1347  case Opt_barrier:
1348  if (match_int(&args[0], &option)) {
1349  status = 0;
1350  goto bail;
1351  }
1352  if (option)
1353  mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1354  else
1355  mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1356  break;
1357  case Opt_intr:
1358  mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1359  break;
1360  case Opt_nointr:
1361  mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1362  break;
1363  case Opt_err_panic:
1364  mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1365  break;
1366  case Opt_err_ro:
1367  mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1368  break;
1369  case Opt_data_ordered:
1370  mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1371  break;
1372  case Opt_data_writeback:
1373  mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1374  break;
1375  case Opt_user_xattr:
1376  mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1377  break;
1378  case Opt_nouser_xattr:
1379  mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1380  break;
1381  case Opt_atime_quantum:
1382  if (match_int(&args[0], &option)) {
1383  status = 0;
1384  goto bail;
1385  }
1386  if (option >= 0)
1387  mopt->atime_quantum = option;
1388  break;
1389  case Opt_slot:
1390  option = 0;
1391  if (match_int(&args[0], &option)) {
1392  status = 0;
1393  goto bail;
1394  }
1395  if (option)
1396  mopt->slot = (s16)option;
1397  break;
1398  case Opt_commit:
1399  option = 0;
1400  if (match_int(&args[0], &option)) {
1401  status = 0;
1402  goto bail;
1403  }
1404  if (option < 0)
1405  return 0;
1406  if (option == 0)
1407  option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1408  mopt->commit_interval = HZ * option;
1409  break;
1410  case Opt_localalloc:
1411  option = 0;
1412  if (match_int(&args[0], &option)) {
1413  status = 0;
1414  goto bail;
1415  }
1416  if (option >= 0)
1417  mopt->localalloc_opt = option;
1418  break;
1419  case Opt_localflocks:
1420  /*
1421  * Changing this during remount could race
1422  * flock() requests, or "unbalance" existing
1423  * ones (e.g., a lock is taken in one mode but
1424  * dropped in the other). If users care enough
1425  * to flip locking modes during remount, we
1426  * could add a "local" flag to individual
1427  * flock structures for proper tracking of
1428  * state.
1429  */
1430  if (!is_remount)
1431  mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1432  break;
1433  case Opt_stack:
1434  /* Check both that the option we were passed
1435  * is of the right length and that it is a proper
1436  * string of the right length.
1437  */
1438  if (((args[0].to - args[0].from) !=
1439  OCFS2_STACK_LABEL_LEN) ||
1440  (strnlen(args[0].from,
1441  OCFS2_STACK_LABEL_LEN) !=
1442  OCFS2_STACK_LABEL_LEN)) {
1443  mlog(ML_ERROR,
1444  "Invalid cluster_stack option\n");
1445  status = 0;
1446  goto bail;
1447  }
1448  memcpy(mopt->cluster_stack, args[0].from,
1449  OCFS2_STACK_LABEL_LEN);
1450  mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1451  /*
1452  * Open code the memcmp here as we don't have
1453  * an osb to pass to
1454  * ocfs2_userspace_stack().
1455  */
1456  if (memcmp(mopt->cluster_stack,
1457  OCFS2_CLASSIC_CLUSTER_STACK,
1458  OCFS2_STACK_LABEL_LEN))
1459  user_stack = 1;
1460  break;
1461  case Opt_inode64:
1462  mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1463  break;
1464  case Opt_usrquota:
1465  mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1466  break;
1467  case Opt_grpquota:
1468  mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1469  break;
1470  case Opt_coherency_buffered:
1471  mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1472  break;
1473  case Opt_coherency_full:
1474  mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1475  break;
1476  case Opt_acl:
1477  mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1478  mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1479  break;
1480  case Opt_noacl:
1481  mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1482  mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1483  break;
1484  case Opt_resv_level:
1485  if (is_remount)
1486  break;
1487  if (match_int(&args[0], &option)) {
1488  status = 0;
1489  goto bail;
1490  }
1491  if (option >= OCFS2_MIN_RESV_LEVEL &&
1492  option < OCFS2_MAX_RESV_LEVEL)
1493  mopt->resv_level = option;
1494  break;
1495  case Opt_dir_resv_level:
1496  if (is_remount)
1497  break;
1498  if (match_int(&args[0], &option)) {
1499  status = 0;
1500  goto bail;
1501  }
1502  if (option >= OCFS2_MIN_RESV_LEVEL &&
1503  option < OCFS2_MAX_RESV_LEVEL)
1504  mopt->dir_resv_level = option;
1505  break;
1506  default:
1507  mlog(ML_ERROR,
1508  "Unrecognized mount option \"%s\" "
1509  "or missing value\n", p);
1510  status = 0;
1511  goto bail;
1512  }
1513  }
1514 
1515  if (user_stack == 0) {
1516  /* Ensure only one heartbeat mode */
1517  tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1518  OCFS2_MOUNT_HB_GLOBAL |
1519  OCFS2_MOUNT_HB_NONE);
1520  if (hweight32(tmp) != 1) {
1521  mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1522  status = 0;
1523  goto bail;
1524  }
1525  }
1526 
1527  status = 1;
1528 
1529 bail:
1530  return status;
1531 }
1532 
1533 static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
1534 {
1535  struct ocfs2_super *osb = OCFS2_SB(root->d_sb);
1536  unsigned long opts = osb->s_mount_opt;
1537  unsigned int local_alloc_megs;
1538 
1539  if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1540  seq_printf(s, ",_netdev");
1541  if (opts & OCFS2_MOUNT_HB_LOCAL)
1542  seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1543  else
1544  seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1545  } else
1546  seq_printf(s, ",%s", OCFS2_HB_NONE);
1547 
1548  if (opts & OCFS2_MOUNT_NOINTR)
1549  seq_printf(s, ",nointr");
1550 
1551  if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1552  seq_printf(s, ",data=writeback");
1553  else
1554  seq_printf(s, ",data=ordered");
1555 
1556  if (opts & OCFS2_MOUNT_BARRIER)
1557  seq_printf(s, ",barrier=1");
1558 
1559  if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1560  seq_printf(s, ",errors=panic");
1561  else
1562  seq_printf(s, ",errors=remount-ro");
1563 
1564  if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1565  seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1566 
1567  seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1568 
1569  if (osb->osb_commit_interval)
1570  seq_printf(s, ",commit=%u",
1571  (unsigned) (osb->osb_commit_interval / HZ));
1572 
1573  local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1574  if (local_alloc_megs != ocfs2_la_default_mb(osb))
1575  seq_printf(s, ",localalloc=%d", local_alloc_megs);
1576 
1577  if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1578  seq_printf(s, ",localflocks,");
1579 
1580  if (osb->osb_cluster_stack[0])
1581  seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1582  osb->osb_cluster_stack);
1583  if (opts & OCFS2_MOUNT_USRQUOTA)
1584  seq_printf(s, ",usrquota");
1585  if (opts & OCFS2_MOUNT_GRPQUOTA)
1586  seq_printf(s, ",grpquota");
1587 
1588  if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1589  seq_printf(s, ",coherency=buffered");
1590  else
1591  seq_printf(s, ",coherency=full");
1592 
1593  if (opts & OCFS2_MOUNT_NOUSERXATTR)
1594  seq_printf(s, ",nouser_xattr");
1595  else
1596  seq_printf(s, ",user_xattr");
1597 
1598  if (opts & OCFS2_MOUNT_INODE64)
1599  seq_printf(s, ",inode64");
1600 
1601  if (opts & OCFS2_MOUNT_POSIX_ACL)
1602  seq_printf(s, ",acl");
1603  else
1604  seq_printf(s, ",noacl");
1605 
1606  if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1607  seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1608 
1609  if (osb->osb_dir_resv_level != osb->osb_resv_level)
1610  seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1611 
1612  return 0;
1613 }
1614 
1615 wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
1616 
1617 static int __init ocfs2_init(void)
1618 {
1619  int status, i;
1620 
1621  ocfs2_print_version();
1622 
1623  for (i = 0; i < OCFS2_IOEND_WQ_HASH_SZ; i++)
1624  init_waitqueue_head(&ocfs2__ioend_wq[i]);
1625 
1626  status = init_ocfs2_uptodate_cache();
1627  if (status < 0)
1628  goto out1;
1629 
1630  status = ocfs2_initialize_mem_caches();
1631  if (status < 0)
1632  goto out2;
1633 
1634  ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1635  if (!ocfs2_wq) {
1636  status = -ENOMEM;
1637  goto out3;
1638  }
1639 
1640  ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1641  if (!ocfs2_debugfs_root) {
1642  status = -EFAULT;
1643  mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1644  }
1645 
1646  ocfs2_set_locking_protocol();
1647 
1648  status = register_quota_format(&ocfs2_quota_format);
1649  if (status < 0)
1650  goto out4;
1651  status = register_filesystem(&ocfs2_fs_type);
1652  if (!status)
1653  return 0;
1654 
1655  unregister_quota_format(&ocfs2_quota_format);
1656 out4:
1657  destroy_workqueue(ocfs2_wq);
1658  debugfs_remove(ocfs2_debugfs_root);
1659 out3:
1660  ocfs2_free_mem_caches();
1661 out2:
1662  exit_ocfs2_uptodate_cache();
1663 out1:
1664  mlog_errno(status);
1665  return status;
1666 }
1667 
1668 static void __exit ocfs2_exit(void)
1669 {
1670  if (ocfs2_wq) {
1671  flush_workqueue(ocfs2_wq);
1672  destroy_workqueue(ocfs2_wq);
1673  }
1674 
1675  unregister_quota_format(&ocfs2_quota_format);
1676 
1677  debugfs_remove(ocfs2_debugfs_root);
1678 
1679  ocfs2_free_mem_caches();
1680 
1681  unregister_filesystem(&ocfs2_fs_type);
1682 
1683  exit_ocfs2_uptodate_cache();
1684 }
1685 
1686 static void ocfs2_put_super(struct super_block *sb)
1687 {
1688  trace_ocfs2_put_super(sb);
1689 
1690  ocfs2_sync_blockdev(sb);
1691  ocfs2_dismount_volume(sb, 0);
1692 }
1693 
1694 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1695 {
1696  struct ocfs2_super *osb;
1697  u32 numbits, freebits;
1698  int status;
1699  struct ocfs2_dinode *bm_lock;
1700  struct buffer_head *bh = NULL;
1701  struct inode *inode = NULL;
1702 
1703  trace_ocfs2_statfs(dentry->d_sb, buf);
1704 
1705  osb = OCFS2_SB(dentry->d_sb);
1706 
1707  inode = ocfs2_get_system_file_inode(osb,
1708  GLOBAL_BITMAP_SYSTEM_INODE,
1709  OCFS2_INVALID_SLOT);
1710  if (!inode) {
1711  mlog(ML_ERROR, "failed to get bitmap inode\n");
1712  status = -EIO;
1713  goto bail;
1714  }
1715 
1716  status = ocfs2_inode_lock(inode, &bh, 0);
1717  if (status < 0) {
1718  mlog_errno(status);
1719  goto bail;
1720  }
1721 
1722  bm_lock = (struct ocfs2_dinode *) bh->b_data;
1723 
1724  numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1725  freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1726 
1727  buf->f_type = OCFS2_SUPER_MAGIC;
1728  buf->f_bsize = dentry->d_sb->s_blocksize;
1729  buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1730  buf->f_blocks = ((sector_t) numbits) *
1731  (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1732  buf->f_bfree = ((sector_t) freebits) *
1733  (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1734  buf->f_bavail = buf->f_bfree;
1735  buf->f_files = numbits;
1736  buf->f_ffree = freebits;
1737  buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1738  & 0xFFFFFFFFUL;
1739  buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1740  OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1741 
1742  brelse(bh);
1743 
1744  ocfs2_inode_unlock(inode, 0);
1745  status = 0;
1746 bail:
1747  if (inode)
1748  iput(inode);
1749 
1750  if (status)
1751  mlog_errno(status);
1752 
1753  return status;
1754 }
1755 
1756 static void ocfs2_inode_init_once(void *data)
1757 {
1758  struct ocfs2_inode_info *oi = data;
1759 
1760  oi->ip_flags = 0;
1761  oi->ip_open_count = 0;
1762  spin_lock_init(&oi->ip_lock);
1763  ocfs2_extent_map_init(&oi->vfs_inode);
1764  INIT_LIST_HEAD(&oi->ip_io_markers);
1765  oi->ip_dir_start_lookup = 0;
1766  atomic_set(&oi->ip_unaligned_aio, 0);
1767  init_rwsem(&oi->ip_alloc_sem);
1768  init_rwsem(&oi->ip_xattr_sem);
1769  mutex_init(&oi->ip_io_mutex);
1770 
1771  oi->ip_blkno = 0ULL;
1772  oi->ip_clusters = 0;
1773 
1774  ocfs2_resv_init_once(&oi->ip_la_data_resv);
1775 
1776  ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1777  ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1778  ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1779 
1780  ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1781  &ocfs2_inode_caching_ops);
1782 
1783  inode_init_once(&oi->vfs_inode);
1784 }
1785 
1786 static int ocfs2_initialize_mem_caches(void)
1787 {
1788  ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1789  sizeof(struct ocfs2_inode_info),
1790  0,
1791  (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1792  SLAB_MEM_SPREAD),
1793  ocfs2_inode_init_once);
1794  ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1795  sizeof(struct ocfs2_dquot),
1796  0,
1797  (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1798  SLAB_MEM_SPREAD),
1799  NULL);
1800  ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1801  sizeof(struct ocfs2_quota_chunk),
1802  0,
1803  (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1804  NULL);
1805  if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1806  !ocfs2_qf_chunk_cachep) {
1807  if (ocfs2_inode_cachep)
1808  kmem_cache_destroy(ocfs2_inode_cachep);
1809  if (ocfs2_dquot_cachep)
1810  kmem_cache_destroy(ocfs2_dquot_cachep);
1811  if (ocfs2_qf_chunk_cachep)
1812  kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1813  return -ENOMEM;
1814  }
1815 
1816  return 0;
1817 }
1818 
1819 static void ocfs2_free_mem_caches(void)
1820 {
1821  /*
1822  * Make sure all delayed rcu free inodes are flushed before we
1823  * destroy cache.
1824  */
1825  rcu_barrier();
1826  if (ocfs2_inode_cachep)
1827  kmem_cache_destroy(ocfs2_inode_cachep);
1828  ocfs2_inode_cachep = NULL;
1829 
1830  if (ocfs2_dquot_cachep)
1831  kmem_cache_destroy(ocfs2_dquot_cachep);
1832  ocfs2_dquot_cachep = NULL;
1833 
1834  if (ocfs2_qf_chunk_cachep)
1835  kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1836  ocfs2_qf_chunk_cachep = NULL;
1837 }
1838 
1839 static int ocfs2_get_sector(struct super_block *sb,
1840  struct buffer_head **bh,
1841  int block,
1842  int sect_size)
1843 {
1844  if (!sb_set_blocksize(sb, sect_size)) {
1845  mlog(ML_ERROR, "unable to set blocksize\n");
1846  return -EIO;
1847  }
1848 
1849  *bh = sb_getblk(sb, block);
1850  if (!*bh) {
1851  mlog_errno(-EIO);
1852  return -EIO;
1853  }
1854  lock_buffer(*bh);
1855  if (!buffer_dirty(*bh))
1856  clear_buffer_uptodate(*bh);
1857  unlock_buffer(*bh);
1858  ll_rw_block(READ, 1, bh);
1859  wait_on_buffer(*bh);
1860  if (!buffer_uptodate(*bh)) {
1861  mlog_errno(-EIO);
1862  brelse(*bh);
1863  *bh = NULL;
1864  return -EIO;
1865  }
1866 
1867  return 0;
1868 }
1869 
1870 static int ocfs2_mount_volume(struct super_block *sb)
1871 {
1872  int status = 0;
1873  int unlock_super = 0;
1874  struct ocfs2_super *osb = OCFS2_SB(sb);
1875 
1876  if (ocfs2_is_hard_readonly(osb))
1877  goto leave;
1878 
1879  status = ocfs2_dlm_init(osb);
1880  if (status < 0) {
1881  mlog_errno(status);
1882  goto leave;
1883  }
1884 
1885  status = ocfs2_super_lock(osb, 1);
1886  if (status < 0) {
1887  mlog_errno(status);
1888  goto leave;
1889  }
1890  unlock_super = 1;
1891 
1892  /* This will load up the node map and add ourselves to it. */
1893  status = ocfs2_find_slot(osb);
1894  if (status < 0) {
1895  mlog_errno(status);
1896  goto leave;
1897  }
1898 
1899  /* load all node-local system inodes */
1900  status = ocfs2_init_local_system_inodes(osb);
1901  if (status < 0) {
1902  mlog_errno(status);
1903  goto leave;
1904  }
1905 
1906  status = ocfs2_check_volume(osb);
1907  if (status < 0) {
1908  mlog_errno(status);
1909  goto leave;
1910  }
1911 
1912  status = ocfs2_truncate_log_init(osb);
1913  if (status < 0)
1914  mlog_errno(status);
1915 
1916 leave:
1917  if (unlock_super)
1918  ocfs2_super_unlock(osb, 1);
1919 
1920  return status;
1921 }
1922 
1923 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1924 {
1925  int tmp, hangup_needed = 0;
1926  struct ocfs2_super *osb = NULL;
1927  char nodestr[8];
1928 
1929  trace_ocfs2_dismount_volume(sb);
1930 
1931  BUG_ON(!sb);
1932  osb = OCFS2_SB(sb);
1933  BUG_ON(!osb);
1934 
1935  debugfs_remove(osb->osb_ctxt);
1936 
1937  /*
1938  * Flush inode dropping work queue so that deletes are
1939  * performed while the filesystem is still working
1940  */
1941  ocfs2_drop_all_dl_inodes(osb);
1942 
1943  /* Orphan scan should be stopped as early as possible */
1944  ocfs2_orphan_scan_stop(osb);
1945 
1946  ocfs2_disable_quotas(osb);
1947 
1948  ocfs2_shutdown_local_alloc(osb);
1949 
1950  ocfs2_truncate_log_shutdown(osb);
1951 
1952  /* This will disable recovery and flush any recovery work. */
1953  ocfs2_recovery_exit(osb);
1954 
1955  ocfs2_journal_shutdown(osb);
1956 
1957  ocfs2_sync_blockdev(sb);
1958 
1959  ocfs2_purge_refcount_trees(osb);
1960 
1961  /* No cluster connection means we've failed during mount, so skip
1962  * all the steps which depended on that to complete. */
1963  if (osb->cconn) {
1964  tmp = ocfs2_super_lock(osb, 1);
1965  if (tmp < 0) {
1966  mlog_errno(tmp);
1967  return;
1968  }
1969  }
1970 
1971  if (osb->slot_num != OCFS2_INVALID_SLOT)
1972  ocfs2_put_slot(osb);
1973 
1974  if (osb->cconn)
1975  ocfs2_super_unlock(osb, 1);
1976 
1977  ocfs2_release_system_inodes(osb);
1978 
1979  /*
1980  * If we're dismounting due to mount error, mount.ocfs2 will clean
1981  * up heartbeat. If we're a local mount, there is no heartbeat.
1982  * If we failed before we got a uuid_str yet, we can't stop
1983  * heartbeat. Otherwise, do it.
1984  */
1985  if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str &&
1986  !ocfs2_is_hard_readonly(osb))
1987  hangup_needed = 1;
1988 
1989  if (osb->cconn)
1990  ocfs2_dlm_shutdown(osb, hangup_needed);
1991 
1992  ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1993  debugfs_remove(osb->osb_debug_root);
1994 
1995  if (hangup_needed)
1996  ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1997 
1998  atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1999 
2000  if (ocfs2_mount_local(osb))
2001  snprintf(nodestr, sizeof(nodestr), "local");
2002  else
2003  snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
2004 
2005  printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
2006  osb->dev_str, nodestr);
2007 
2008  ocfs2_delete_osb(osb);
2009  kfree(osb);
2010  sb->s_dev = 0;
2011  sb->s_fs_info = NULL;
2012 }
2013 
2014 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2015  unsigned uuid_bytes)
2016 {
2017  int i, ret;
2018  char *ptr;
2019 
2020  BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2021 
2022  osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2023  if (osb->uuid_str == NULL)
2024  return -ENOMEM;
2025 
2026  for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2027  /* print with null */
2028  ret = snprintf(ptr, 3, "%02X", uuid[i]);
2029  if (ret != 2) /* drop super cleans up */
2030  return -EINVAL;
2031  /* then only advance past the last char */
2032  ptr += 2;
2033  }
2034 
2035  return 0;
2036 }
2037 
2038 /* Make sure entire volume is addressable by our journal. Requires
2039  osb_clusters_at_boot to be valid and for the journal to have been
2040  initialized by ocfs2_journal_init(). */
2041 static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2042 {
2043  int status = 0;
2044  u64 max_block =
2045  ocfs2_clusters_to_blocks(osb->sb,
2046  osb->osb_clusters_at_boot) - 1;
2047 
2048  /* 32-bit block number is always OK. */
2049  if (max_block <= (u32)~0ULL)
2050  goto out;
2051 
2052  /* Volume is "huge", so see if our journal is new enough to
2053  support it. */
2054  if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2055  OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2056  jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2057  JBD2_FEATURE_INCOMPAT_64BIT))) {
2058  mlog(ML_ERROR, "The journal cannot address the entire volume. "
2059  "Enable the 'block64' journal option with tunefs.ocfs2");
2060  status = -EFBIG;
2061  goto out;
2062  }
2063 
2064  out:
2065  return status;
2066 }
2067 
2068 static int ocfs2_initialize_super(struct super_block *sb,
2069  struct buffer_head *bh,
2070  int sector_size,
2071  struct ocfs2_blockcheck_stats *stats)
2072 {
2073  int status;
2074  int i, cbits, bbits;
2075  struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2076  struct inode *inode = NULL;
2077  struct ocfs2_journal *journal;
2078  __le32 uuid_net_key;
2079  struct ocfs2_super *osb;
2080  u64 total_blocks;
2081 
2082  osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2083  if (!osb) {
2084  status = -ENOMEM;
2085  mlog_errno(status);
2086  goto bail;
2087  }
2088 
2089  sb->s_fs_info = osb;
2090  sb->s_op = &ocfs2_sops;
2091  sb->s_d_op = &ocfs2_dentry_ops;
2092  sb->s_export_op = &ocfs2_export_ops;
2093  sb->s_qcop = &ocfs2_quotactl_ops;
2094  sb->dq_op = &ocfs2_quota_operations;
2095  sb->s_xattr = ocfs2_xattr_handlers;
2096  sb->s_time_gran = 1;
2097  sb->s_flags |= MS_NOATIME;
2098  /* this is needed to support O_LARGEFILE */
2099  cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2100  bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2101  sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2102 
2103  osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2104 
2105  for (i = 0; i < 3; i++)
2106  osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2107  osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2108 
2109  osb->sb = sb;
2110  /* Save off for ocfs2_rw_direct */
2111  osb->s_sectsize_bits = blksize_bits(sector_size);
2112  BUG_ON(!osb->s_sectsize_bits);
2113 
2114  spin_lock_init(&osb->dc_task_lock);
2115  init_waitqueue_head(&osb->dc_event);
2116  osb->dc_work_sequence = 0;
2117  osb->dc_wake_sequence = 0;
2118  INIT_LIST_HEAD(&osb->blocked_lock_list);
2119  osb->blocked_lock_count = 0;
2120  spin_lock_init(&osb->osb_lock);
2121  spin_lock_init(&osb->osb_xattr_lock);
2122  ocfs2_init_steal_slots(osb);
2123 
2124  atomic_set(&osb->alloc_stats.moves, 0);
2125  atomic_set(&osb->alloc_stats.local_data, 0);
2126  atomic_set(&osb->alloc_stats.bitmap_data, 0);
2127  atomic_set(&osb->alloc_stats.bg_allocs, 0);
2128  atomic_set(&osb->alloc_stats.bg_extends, 0);
2129 
2130  /* Copy the blockcheck stats from the superblock probe */
2131  osb->osb_ecc_stats = *stats;
2132 
2133  ocfs2_init_node_maps(osb);
2134 
2135  snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2136  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2137 
2138  osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2139  if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2140  mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2141  osb->max_slots);
2142  status = -EINVAL;
2143  goto bail;
2144  }
2145 
2146  ocfs2_orphan_scan_init(osb);
2147 
2148  status = ocfs2_recovery_init(osb);
2149  if (status) {
2150  mlog(ML_ERROR, "Unable to initialize recovery state\n");
2151  mlog_errno(status);
2152  goto bail;
2153  }
2154 
2155  init_waitqueue_head(&osb->checkpoint_event);
2156  atomic_set(&osb->needs_checkpoint, 0);
2157 
2158  osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2159 
2160  osb->slot_num = OCFS2_INVALID_SLOT;
2161 
2162  osb->s_xattr_inline_size = le16_to_cpu(
2163  di->id2.i_super.s_xattr_inline_size);
2164 
2165  osb->local_alloc_state = OCFS2_LA_UNUSED;
2166  osb->local_alloc_bh = NULL;
2167  INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2168 
2169  init_waitqueue_head(&osb->osb_mount_event);
2170 
2171  status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2172  if (status) {
2173  mlog_errno(status);
2174  goto bail;
2175  }
2176 
2177  osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2178  if (!osb->vol_label) {
2179  mlog(ML_ERROR, "unable to alloc vol label\n");
2180  status = -ENOMEM;
2181  goto bail;
2182  }
2183 
2184  osb->slot_recovery_generations =
2185  kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2186  GFP_KERNEL);
2187  if (!osb->slot_recovery_generations) {
2188  status = -ENOMEM;
2189  mlog_errno(status);
2190  goto bail;
2191  }
2192 
2193  init_waitqueue_head(&osb->osb_wipe_event);
2194  osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2195  sizeof(*osb->osb_orphan_wipes),
2196  GFP_KERNEL);
2197  if (!osb->osb_orphan_wipes) {
2198  status = -ENOMEM;
2199  mlog_errno(status);
2200  goto bail;
2201  }
2202 
2203  osb->osb_rf_lock_tree = RB_ROOT;
2204 
2205  osb->s_feature_compat =
2206  le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2207  osb->s_feature_ro_compat =
2208  le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2209  osb->s_feature_incompat =
2210  le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2211 
2212  if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2213  mlog(ML_ERROR, "couldn't mount because of unsupported "
2214  "optional features (%x).\n", i);
2215  status = -EINVAL;
2216  goto bail;
2217  }
2218  if (!(osb->sb->s_flags & MS_RDONLY) &&
2219  (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2220  mlog(ML_ERROR, "couldn't mount RDWR because of "
2221  "unsupported optional features (%x).\n", i);
2222  status = -EINVAL;
2223  goto bail;
2224  }
2225 
2226  if (ocfs2_clusterinfo_valid(osb)) {
2227  osb->osb_stackflags =
2228  OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2229  memcpy(osb->osb_cluster_stack,
2230  OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2231  OCFS2_STACK_LABEL_LEN);
2232  osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2233  if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2234  mlog(ML_ERROR,
2235  "couldn't mount because of an invalid "
2236  "cluster stack label (%s) \n",
2237  osb->osb_cluster_stack);
2238  status = -EINVAL;
2239  goto bail;
2240  }
2241  } else {
2242  /* The empty string is identical with classic tools that
2243  * don't know about s_cluster_info. */
2244  osb->osb_cluster_stack[0] = '\0';
2245  }
2246 
2247  get_random_bytes(&osb->s_next_generation, sizeof(u32));
2248 
2249  /* FIXME
2250  * This should be done in ocfs2_journal_init(), but unknown
2251  * ordering issues will cause the filesystem to crash.
2252  * If anyone wants to figure out what part of the code
2253  * refers to osb->journal before ocfs2_journal_init() is run,
2254  * be my guest.
2255  */
2256  /* initialize our journal structure */
2257 
2258  journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2259  if (!journal) {
2260  mlog(ML_ERROR, "unable to alloc journal\n");
2261  status = -ENOMEM;
2262  goto bail;
2263  }
2264  osb->journal = journal;
2265  journal->j_osb = osb;
2266 
2267  atomic_set(&journal->j_num_trans, 0);
2268  init_rwsem(&journal->j_trans_barrier);
2269  init_waitqueue_head(&journal->j_checkpointed);
2270  spin_lock_init(&journal->j_lock);
2271  journal->j_trans_id = (unsigned long) 1;
2272  INIT_LIST_HEAD(&journal->j_la_cleanups);
2273  INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2274  journal->j_state = OCFS2_JOURNAL_FREE;
2275 
2276  INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2277  osb->dentry_lock_list = NULL;
2278 
2279  /* get some pseudo constants for clustersize bits */
2280  osb->s_clustersize_bits =
2281  le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2282  osb->s_clustersize = 1 << osb->s_clustersize_bits;
2283 
2284  if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2285  osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2286  mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2287  osb->s_clustersize);
2288  status = -EINVAL;
2289  goto bail;
2290  }
2291 
2292  total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2293  le32_to_cpu(di->i_clusters));
2294 
2295  status = generic_check_addressable(osb->sb->s_blocksize_bits,
2296  total_blocks);
2297  if (status) {
2298  mlog(ML_ERROR, "Volume too large "
2299  "to mount safely on this system");
2300  status = -EFBIG;
2301  goto bail;
2302  }
2303 
2304  if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2305  sizeof(di->id2.i_super.s_uuid))) {
2306  mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2307  status = -ENOMEM;
2308  goto bail;
2309  }
2310 
2311  memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2312 
2313  strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2314  osb->vol_label[63] = '\0';
2315  osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2316  osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2317  osb->first_cluster_group_blkno =
2318  le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2319  osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2320  osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2321  trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2322  (unsigned long long)osb->root_blkno,
2323  (unsigned long long)osb->system_dir_blkno,
2324  osb->s_clustersize_bits);
2325 
2326  osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2327  if (!osb->osb_dlm_debug) {
2328  status = -ENOMEM;
2329  mlog_errno(status);
2330  goto bail;
2331  }
2332 
2333  atomic_set(&osb->vol_state, VOLUME_INIT);
2334 
2335  /* load root, system_dir, and all global system inodes */
2336  status = ocfs2_init_global_system_inodes(osb);
2337  if (status < 0) {
2338  mlog_errno(status);
2339  goto bail;
2340  }
2341 
2342  /*
2343  * global bitmap
2344  */
2345  inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2346  OCFS2_INVALID_SLOT);
2347  if (!inode) {
2348  status = -EINVAL;
2349  mlog_errno(status);
2350  goto bail;
2351  }
2352 
2353  osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2354  osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2355  iput(inode);
2356 
2357  osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2358  osb->s_feature_incompat) * 8;
2359 
2360  status = ocfs2_init_slot_info(osb);
2361  if (status < 0) {
2362  mlog_errno(status);
2363  goto bail;
2364  }
2365  cleancache_init_shared_fs((char *)&di->id2.i_super.s_uuid, sb);
2366 
2367 bail:
2368  return status;
2369 }
2370 
2371 /*
2372  * will return: -EAGAIN if it is ok to keep searching for superblocks
2373  * -EINVAL if there is a bad superblock
2374  * 0 on success
2375  */
2376 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2377  struct buffer_head *bh,
2378  u32 blksz,
2379  struct ocfs2_blockcheck_stats *stats)
2380 {
2381  int status = -EAGAIN;
2382 
2383  if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2384  strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2385  /* We have to do a raw check of the feature here */
2386  if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2387  OCFS2_FEATURE_INCOMPAT_META_ECC) {
2388  status = ocfs2_block_check_validate(bh->b_data,
2389  bh->b_size,
2390  &di->i_check,
2391  stats);
2392  if (status)
2393  goto out;
2394  }
2395  status = -EINVAL;
2396  if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2397  mlog(ML_ERROR, "found superblock with incorrect block "
2398  "size: found %u, should be %u\n",
2399  1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2400  blksz);
2401  } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2402  OCFS2_MAJOR_REV_LEVEL ||
2403  le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2404  OCFS2_MINOR_REV_LEVEL) {
2405  mlog(ML_ERROR, "found superblock with bad version: "
2406  "found %u.%u, should be %u.%u\n",
2407  le16_to_cpu(di->id2.i_super.s_major_rev_level),
2408  le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2409  OCFS2_MAJOR_REV_LEVEL,
2410  OCFS2_MINOR_REV_LEVEL);
2411  } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2412  mlog(ML_ERROR, "bad block number on superblock: "
2413  "found %llu, should be %llu\n",
2414  (unsigned long long)le64_to_cpu(di->i_blkno),
2415  (unsigned long long)bh->b_blocknr);
2416  } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2417  le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2418  mlog(ML_ERROR, "bad cluster size found: %u\n",
2419  1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2420  } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2421  mlog(ML_ERROR, "bad root_blkno: 0\n");
2422  } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2423  mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2424  } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2425  mlog(ML_ERROR,
2426  "Superblock slots found greater than file system "
2427  "maximum: found %u, max %u\n",
2428  le16_to_cpu(di->id2.i_super.s_max_slots),
2429  OCFS2_MAX_SLOTS);
2430  } else {
2431  /* found it! */
2432  status = 0;
2433  }
2434  }
2435 
2436 out:
2437  if (status && status != -EAGAIN)
2438  mlog_errno(status);
2439  return status;
2440 }
2441 
2442 static int ocfs2_check_volume(struct ocfs2_super *osb)
2443 {
2444  int status;
2445  int dirty;
2446  int local;
2447  struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2448  * recover
2449  * ourselves. */
2450 
2451  /* Init our journal object. */
2452  status = ocfs2_journal_init(osb->journal, &dirty);
2453  if (status < 0) {
2454  mlog(ML_ERROR, "Could not initialize journal!\n");
2455  goto finally;
2456  }
2457 
2458  /* Now that journal has been initialized, check to make sure
2459  entire volume is addressable. */
2460  status = ocfs2_journal_addressable(osb);
2461  if (status)
2462  goto finally;
2463 
2464  /* If the journal was unmounted cleanly then we don't want to
2465  * recover anything. Otherwise, journal_load will do that
2466  * dirty work for us :) */
2467  if (!dirty) {
2468  status = ocfs2_journal_wipe(osb->journal, 0);
2469  if (status < 0) {
2470  mlog_errno(status);
2471  goto finally;
2472  }
2473  } else {
2474  printk(KERN_NOTICE "ocfs2: File system on device (%s) was not "
2475  "unmounted cleanly, recovering it.\n", osb->dev_str);
2476  }
2477 
2478  local = ocfs2_mount_local(osb);
2479 
2480  /* will play back anything left in the journal. */
2481  status = ocfs2_journal_load(osb->journal, local, dirty);
2482  if (status < 0) {
2483  mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2484  goto finally;
2485  }
2486 
2487  if (dirty) {
2488  /* recover my local alloc if we didn't unmount cleanly. */
2489  status = ocfs2_begin_local_alloc_recovery(osb,
2490  osb->slot_num,
2491  &local_alloc);
2492  if (status < 0) {
2493  mlog_errno(status);
2494  goto finally;
2495  }
2496  /* we complete the recovery process after we've marked
2497  * ourselves as mounted. */
2498  }
2499 
2500  status = ocfs2_load_local_alloc(osb);
2501  if (status < 0) {
2502  mlog_errno(status);
2503  goto finally;
2504  }
2505 
2506  if (dirty) {
2507  /* Recovery will be completed after we've mounted the
2508  * rest of the volume. */
2509  osb->dirty = 1;
2510  osb->local_alloc_copy = local_alloc;
2511  local_alloc = NULL;
2512  }
2513 
2514  /* go through each journal, trylock it and if you get the
2515  * lock, and it's marked as dirty, set the bit in the recover
2516  * map and launch a recovery thread for it. */
2517  status = ocfs2_mark_dead_nodes(osb);
2518  if (status < 0) {
2519  mlog_errno(status);
2520  goto finally;
2521  }
2522 
2523  status = ocfs2_compute_replay_slots(osb);
2524  if (status < 0)
2525  mlog_errno(status);
2526 
2527 finally:
2528  if (local_alloc)
2529  kfree(local_alloc);
2530 
2531  if (status)
2532  mlog_errno(status);
2533  return status;
2534 }
2535 
2536 /*
2537  * The routine gets called from dismount or close whenever a dismount on
2538  * volume is requested and the osb open count becomes 1.
2539  * It will remove the osb from the global list and also free up all the
2540  * initialized resources and fileobject.
2541  */
2542 static void ocfs2_delete_osb(struct ocfs2_super *osb)
2543 {
2544  /* This function assumes that the caller has the main osb resource */
2545 
2546  ocfs2_free_slot_info(osb);
2547 
2548  kfree(osb->osb_orphan_wipes);
2549  kfree(osb->slot_recovery_generations);
2550  /* FIXME
2551  * This belongs in journal shutdown, but because we have to
2552  * allocate osb->journal at the start of ocfs2_initialize_osb(),
2553  * we free it here.
2554  */
2555  kfree(osb->journal);
2556  if (osb->local_alloc_copy)
2557  kfree(osb->local_alloc_copy);
2558  kfree(osb->uuid_str);
2559  ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2560  memset(osb, 0, sizeof(struct ocfs2_super));
2561 }
2562 
2563 /* Put OCFS2 into a readonly state, or (if the user specifies it),
2564  * panic(). We do not support continue-on-error operation. */
2565 static void ocfs2_handle_error(struct super_block *sb)
2566 {
2567  struct ocfs2_super *osb = OCFS2_SB(sb);
2568 
2569  if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2570  panic("OCFS2: (device %s): panic forced after error\n",
2571  sb->s_id);
2572 
2573  ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2574 
2575  if (sb->s_flags & MS_RDONLY &&
2576  (ocfs2_is_soft_readonly(osb) ||
2577  ocfs2_is_hard_readonly(osb)))
2578  return;
2579 
2580  printk(KERN_CRIT "File system is now read-only due to the potential "
2581  "of on-disk corruption. Please run fsck.ocfs2 once the file "
2582  "system is unmounted.\n");
2583  sb->s_flags |= MS_RDONLY;
2584  ocfs2_set_ro_flag(osb, 0);
2585 }
2586 
2587 static char error_buf[1024];
2588 
2589 void __ocfs2_error(struct super_block *sb,
2590  const char *function,
2591  const char *fmt, ...)
2592 {
2593  va_list args;
2594 
2595  va_start(args, fmt);
2596  vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2597  va_end(args);
2598 
2599  /* Not using mlog here because we want to show the actual
2600  * function the error came from. */
2601  printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2602  sb->s_id, function, error_buf);
2603 
2604  ocfs2_handle_error(sb);
2605 }
2606 
2607 /* Handle critical errors. This is intentionally more drastic than
2608  * ocfs2_handle_error, so we only use for things like journal errors,
2609  * etc. */
2610 void __ocfs2_abort(struct super_block* sb,
2611  const char *function,
2612  const char *fmt, ...)
2613 {
2614  va_list args;
2615 
2616  va_start(args, fmt);
2617  vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2618  va_end(args);
2619 
2620  printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2621  sb->s_id, function, error_buf);
2622 
2623  /* We don't have the cluster support yet to go straight to
2624  * hard readonly in here. Until then, we want to keep
2625  * ocfs2_abort() so that we can at least mark critical
2626  * errors.
2627  *
2628  * TODO: This should abort the journal and alert other nodes
2629  * that our slot needs recovery. */
2630 
2631  /* Force a panic(). This stinks, but it's better than letting
2632  * things continue without having a proper hard readonly
2633  * here. */
2634  if (!ocfs2_mount_local(OCFS2_SB(sb)))
2635  OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2636  ocfs2_handle_error(sb);
2637 }
2638 
2639 /*
2640  * Void signal blockers, because in-kernel sigprocmask() only fails
2641  * when SIG_* is wrong.
2642  */
2643 void ocfs2_block_signals(sigset_t *oldset)
2644 {
2645  int rc;
2646  sigset_t blocked;
2647 
2648  sigfillset(&blocked);
2649  rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2650  BUG_ON(rc);
2651 }
2652 
2653 void ocfs2_unblock_signals(sigset_t *oldset)
2654 {
2655  int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2656  BUG_ON(rc);
2657 }
2658 
2659 module_init(ocfs2_init);
2660 module_exit(ocfs2_exit);
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