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ocfs2: Silence false lockdep warnings
[mirror_ubuntu-artful-kernel.git] / fs / ocfs2 / super.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * super.c
5 *
6 * load/unload driver, mount/dismount volumes
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/utsname.h>
32 #include <linux/init.h>
33 #include <linux/random.h>
34 #include <linux/statfs.h>
35 #include <linux/moduleparam.h>
36 #include <linux/blkdev.h>
37 #include <linux/socket.h>
38 #include <linux/inet.h>
39 #include <linux/parser.h>
40 #include <linux/crc32.h>
41 #include <linux/debugfs.h>
42 #include <linux/mount.h>
43
44 #include <cluster/nodemanager.h>
45
46 #define MLOG_MASK_PREFIX ML_SUPER
47 #include <cluster/masklog.h>
48
49 #include "ocfs2.h"
50
51 /* this should be the only file to include a version 1 header */
52 #include "ocfs1_fs_compat.h"
53
54 #include "alloc.h"
55 #include "dlmglue.h"
56 #include "export.h"
57 #include "extent_map.h"
58 #include "heartbeat.h"
59 #include "inode.h"
60 #include "journal.h"
61 #include "localalloc.h"
62 #include "namei.h"
63 #include "slot_map.h"
64 #include "super.h"
65 #include "sysfile.h"
66 #include "uptodate.h"
67 #include "ver.h"
68
69 #include "buffer_head_io.h"
70
71 static struct kmem_cache *ocfs2_inode_cachep = NULL;
72
73 /* OCFS2 needs to schedule several differnt types of work which
74 * require cluster locking, disk I/O, recovery waits, etc. Since these
75 * types of work tend to be heavy we avoid using the kernel events
76 * workqueue and schedule on our own. */
77 struct workqueue_struct *ocfs2_wq = NULL;
78
79 static struct dentry *ocfs2_debugfs_root = NULL;
80
81 MODULE_AUTHOR("Oracle");
82 MODULE_LICENSE("GPL");
83
84 struct mount_options
85 {
86 unsigned long commit_interval;
87 unsigned long mount_opt;
88 unsigned int atime_quantum;
89 signed short slot;
90 unsigned int localalloc_opt;
91 };
92
93 static int ocfs2_parse_options(struct super_block *sb, char *options,
94 struct mount_options *mopt,
95 int is_remount);
96 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
97 static void ocfs2_put_super(struct super_block *sb);
98 static int ocfs2_mount_volume(struct super_block *sb);
99 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
100 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
101 static int ocfs2_initialize_mem_caches(void);
102 static void ocfs2_free_mem_caches(void);
103 static void ocfs2_delete_osb(struct ocfs2_super *osb);
104
105 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
106
107 static int ocfs2_sync_fs(struct super_block *sb, int wait);
108
109 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
110 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
111 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
112 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
113 static int ocfs2_check_volume(struct ocfs2_super *osb);
114 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
115 struct buffer_head *bh,
116 u32 sectsize);
117 static int ocfs2_initialize_super(struct super_block *sb,
118 struct buffer_head *bh,
119 int sector_size);
120 static int ocfs2_get_sector(struct super_block *sb,
121 struct buffer_head **bh,
122 int block,
123 int sect_size);
124 static void ocfs2_write_super(struct super_block *sb);
125 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
126 static void ocfs2_destroy_inode(struct inode *inode);
127
128 static const struct super_operations ocfs2_sops = {
129 .statfs = ocfs2_statfs,
130 .alloc_inode = ocfs2_alloc_inode,
131 .destroy_inode = ocfs2_destroy_inode,
132 .drop_inode = ocfs2_drop_inode,
133 .clear_inode = ocfs2_clear_inode,
134 .delete_inode = ocfs2_delete_inode,
135 .sync_fs = ocfs2_sync_fs,
136 .write_super = ocfs2_write_super,
137 .put_super = ocfs2_put_super,
138 .remount_fs = ocfs2_remount,
139 .show_options = ocfs2_show_options,
140 };
141
142 enum {
143 Opt_barrier,
144 Opt_err_panic,
145 Opt_err_ro,
146 Opt_intr,
147 Opt_nointr,
148 Opt_hb_none,
149 Opt_hb_local,
150 Opt_data_ordered,
151 Opt_data_writeback,
152 Opt_atime_quantum,
153 Opt_slot,
154 Opt_commit,
155 Opt_localalloc,
156 Opt_localflocks,
157 Opt_err,
158 };
159
160 static match_table_t tokens = {
161 {Opt_barrier, "barrier=%u"},
162 {Opt_err_panic, "errors=panic"},
163 {Opt_err_ro, "errors=remount-ro"},
164 {Opt_intr, "intr"},
165 {Opt_nointr, "nointr"},
166 {Opt_hb_none, OCFS2_HB_NONE},
167 {Opt_hb_local, OCFS2_HB_LOCAL},
168 {Opt_data_ordered, "data=ordered"},
169 {Opt_data_writeback, "data=writeback"},
170 {Opt_atime_quantum, "atime_quantum=%u"},
171 {Opt_slot, "preferred_slot=%u"},
172 {Opt_commit, "commit=%u"},
173 {Opt_localalloc, "localalloc=%d"},
174 {Opt_localflocks, "localflocks"},
175 {Opt_err, NULL}
176 };
177
178 /*
179 * write_super and sync_fs ripped right out of ext3.
180 */
181 static void ocfs2_write_super(struct super_block *sb)
182 {
183 if (mutex_trylock(&sb->s_lock) != 0)
184 BUG();
185 sb->s_dirt = 0;
186 }
187
188 static int ocfs2_sync_fs(struct super_block *sb, int wait)
189 {
190 int status;
191 tid_t target;
192 struct ocfs2_super *osb = OCFS2_SB(sb);
193
194 sb->s_dirt = 0;
195
196 if (ocfs2_is_hard_readonly(osb))
197 return -EROFS;
198
199 if (wait) {
200 status = ocfs2_flush_truncate_log(osb);
201 if (status < 0)
202 mlog_errno(status);
203 } else {
204 ocfs2_schedule_truncate_log_flush(osb, 0);
205 }
206
207 if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
208 if (wait)
209 log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
210 target);
211 }
212 return 0;
213 }
214
215 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
216 {
217 struct inode *new = NULL;
218 int status = 0;
219 int i;
220
221 mlog_entry_void();
222
223 new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
224 if (IS_ERR(new)) {
225 status = PTR_ERR(new);
226 mlog_errno(status);
227 goto bail;
228 }
229 osb->root_inode = new;
230
231 new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
232 if (IS_ERR(new)) {
233 status = PTR_ERR(new);
234 mlog_errno(status);
235 goto bail;
236 }
237 osb->sys_root_inode = new;
238
239 for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
240 i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
241 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
242 if (!new) {
243 ocfs2_release_system_inodes(osb);
244 status = -EINVAL;
245 mlog_errno(status);
246 /* FIXME: Should ERROR_RO_FS */
247 mlog(ML_ERROR, "Unable to load system inode %d, "
248 "possibly corrupt fs?", i);
249 goto bail;
250 }
251 // the array now has one ref, so drop this one
252 iput(new);
253 }
254
255 bail:
256 mlog_exit(status);
257 return status;
258 }
259
260 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
261 {
262 struct inode *new = NULL;
263 int status = 0;
264 int i;
265
266 mlog_entry_void();
267
268 for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
269 i < NUM_SYSTEM_INODES;
270 i++) {
271 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
272 if (!new) {
273 ocfs2_release_system_inodes(osb);
274 status = -EINVAL;
275 mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
276 status, i, osb->slot_num);
277 goto bail;
278 }
279 /* the array now has one ref, so drop this one */
280 iput(new);
281 }
282
283 bail:
284 mlog_exit(status);
285 return status;
286 }
287
288 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
289 {
290 int i;
291 struct inode *inode;
292
293 mlog_entry_void();
294
295 for (i = 0; i < NUM_SYSTEM_INODES; i++) {
296 inode = osb->system_inodes[i];
297 if (inode) {
298 iput(inode);
299 osb->system_inodes[i] = NULL;
300 }
301 }
302
303 inode = osb->sys_root_inode;
304 if (inode) {
305 iput(inode);
306 osb->sys_root_inode = NULL;
307 }
308
309 inode = osb->root_inode;
310 if (inode) {
311 iput(inode);
312 osb->root_inode = NULL;
313 }
314
315 mlog_exit(0);
316 }
317
318 /* We're allocating fs objects, use GFP_NOFS */
319 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
320 {
321 struct ocfs2_inode_info *oi;
322
323 oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
324 if (!oi)
325 return NULL;
326
327 return &oi->vfs_inode;
328 }
329
330 static void ocfs2_destroy_inode(struct inode *inode)
331 {
332 kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
333 }
334
335 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
336 unsigned int cbits)
337 {
338 unsigned int bytes = 1 << cbits;
339 unsigned int trim = bytes;
340 unsigned int bitshift = 32;
341
342 /*
343 * i_size and all block offsets in ocfs2 are always 64 bits
344 * wide. i_clusters is 32 bits, in cluster-sized units. So on
345 * 64 bit platforms, cluster size will be the limiting factor.
346 */
347
348 #if BITS_PER_LONG == 32
349 # if defined(CONFIG_LBD)
350 BUILD_BUG_ON(sizeof(sector_t) != 8);
351 /*
352 * We might be limited by page cache size.
353 */
354 if (bytes > PAGE_CACHE_SIZE) {
355 bytes = PAGE_CACHE_SIZE;
356 trim = 1;
357 /*
358 * Shift by 31 here so that we don't get larger than
359 * MAX_LFS_FILESIZE
360 */
361 bitshift = 31;
362 }
363 # else
364 /*
365 * We are limited by the size of sector_t. Use block size, as
366 * that's what we expose to the VFS.
367 */
368 bytes = 1 << bbits;
369 trim = 1;
370 bitshift = 31;
371 # endif
372 #endif
373
374 /*
375 * Trim by a whole cluster when we can actually approach the
376 * on-disk limits. Otherwise we can overflow i_clusters when
377 * an extent start is at the max offset.
378 */
379 return (((unsigned long long)bytes) << bitshift) - trim;
380 }
381
382 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
383 {
384 int incompat_features;
385 int ret = 0;
386 struct mount_options parsed_options;
387 struct ocfs2_super *osb = OCFS2_SB(sb);
388
389 if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
390 ret = -EINVAL;
391 goto out;
392 }
393
394 if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
395 (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
396 ret = -EINVAL;
397 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
398 goto out;
399 }
400
401 if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
402 (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
403 ret = -EINVAL;
404 mlog(ML_ERROR, "Cannot change data mode on remount\n");
405 goto out;
406 }
407
408 /* We're going to/from readonly mode. */
409 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
410 /* Lock here so the check of HARD_RO and the potential
411 * setting of SOFT_RO is atomic. */
412 spin_lock(&osb->osb_lock);
413 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
414 mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
415 ret = -EROFS;
416 goto unlock_osb;
417 }
418
419 if (*flags & MS_RDONLY) {
420 mlog(0, "Going to ro mode.\n");
421 sb->s_flags |= MS_RDONLY;
422 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
423 } else {
424 mlog(0, "Making ro filesystem writeable.\n");
425
426 if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
427 mlog(ML_ERROR, "Cannot remount RDWR "
428 "filesystem due to previous errors.\n");
429 ret = -EROFS;
430 goto unlock_osb;
431 }
432 incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
433 if (incompat_features) {
434 mlog(ML_ERROR, "Cannot remount RDWR because "
435 "of unsupported optional features "
436 "(%x).\n", incompat_features);
437 ret = -EINVAL;
438 goto unlock_osb;
439 }
440 sb->s_flags &= ~MS_RDONLY;
441 osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
442 }
443 unlock_osb:
444 spin_unlock(&osb->osb_lock);
445 }
446
447 if (!ret) {
448 /* Only save off the new mount options in case of a successful
449 * remount. */
450 osb->s_mount_opt = parsed_options.mount_opt;
451 osb->s_atime_quantum = parsed_options.atime_quantum;
452 osb->preferred_slot = parsed_options.slot;
453 if (parsed_options.commit_interval)
454 osb->osb_commit_interval = parsed_options.commit_interval;
455
456 if (!ocfs2_is_hard_readonly(osb))
457 ocfs2_set_journal_params(osb);
458 }
459 out:
460 return ret;
461 }
462
463 static int ocfs2_sb_probe(struct super_block *sb,
464 struct buffer_head **bh,
465 int *sector_size)
466 {
467 int status, tmpstat;
468 struct ocfs1_vol_disk_hdr *hdr;
469 struct ocfs2_dinode *di;
470 int blksize;
471
472 *bh = NULL;
473
474 /* may be > 512 */
475 *sector_size = bdev_hardsect_size(sb->s_bdev);
476 if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
477 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
478 *sector_size, OCFS2_MAX_BLOCKSIZE);
479 status = -EINVAL;
480 goto bail;
481 }
482
483 /* Can this really happen? */
484 if (*sector_size < OCFS2_MIN_BLOCKSIZE)
485 *sector_size = OCFS2_MIN_BLOCKSIZE;
486
487 /* check block zero for old format */
488 status = ocfs2_get_sector(sb, bh, 0, *sector_size);
489 if (status < 0) {
490 mlog_errno(status);
491 goto bail;
492 }
493 hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
494 if (hdr->major_version == OCFS1_MAJOR_VERSION) {
495 mlog(ML_ERROR, "incompatible version: %u.%u\n",
496 hdr->major_version, hdr->minor_version);
497 status = -EINVAL;
498 }
499 if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
500 strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
501 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
502 hdr->signature);
503 status = -EINVAL;
504 }
505 brelse(*bh);
506 *bh = NULL;
507 if (status < 0) {
508 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
509 "upgraded before mounting with ocfs v2\n");
510 goto bail;
511 }
512
513 /*
514 * Now check at magic offset for 512, 1024, 2048, 4096
515 * blocksizes. 4096 is the maximum blocksize because it is
516 * the minimum clustersize.
517 */
518 status = -EINVAL;
519 for (blksize = *sector_size;
520 blksize <= OCFS2_MAX_BLOCKSIZE;
521 blksize <<= 1) {
522 tmpstat = ocfs2_get_sector(sb, bh,
523 OCFS2_SUPER_BLOCK_BLKNO,
524 blksize);
525 if (tmpstat < 0) {
526 status = tmpstat;
527 mlog_errno(status);
528 goto bail;
529 }
530 di = (struct ocfs2_dinode *) (*bh)->b_data;
531 status = ocfs2_verify_volume(di, *bh, blksize);
532 if (status >= 0)
533 goto bail;
534 brelse(*bh);
535 *bh = NULL;
536 if (status != -EAGAIN)
537 break;
538 }
539
540 bail:
541 return status;
542 }
543
544 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
545 {
546 if (ocfs2_mount_local(osb)) {
547 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
548 mlog(ML_ERROR, "Cannot heartbeat on a locally "
549 "mounted device.\n");
550 return -EINVAL;
551 }
552 }
553
554 if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
555 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
556 mlog(ML_ERROR, "Heartbeat has to be started to mount "
557 "a read-write clustered device.\n");
558 return -EINVAL;
559 }
560 }
561
562 return 0;
563 }
564
565 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
566 {
567 struct dentry *root;
568 int status, sector_size;
569 struct mount_options parsed_options;
570 struct inode *inode = NULL;
571 struct ocfs2_super *osb = NULL;
572 struct buffer_head *bh = NULL;
573 char nodestr[8];
574
575 mlog_entry("%p, %p, %i", sb, data, silent);
576
577 if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
578 status = -EINVAL;
579 goto read_super_error;
580 }
581
582 /* for now we only have one cluster/node, make sure we see it
583 * in the heartbeat universe */
584 if (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL) {
585 if (!o2hb_check_local_node_heartbeating()) {
586 status = -EINVAL;
587 goto read_super_error;
588 }
589 }
590
591 /* probe for superblock */
592 status = ocfs2_sb_probe(sb, &bh, &sector_size);
593 if (status < 0) {
594 mlog(ML_ERROR, "superblock probe failed!\n");
595 goto read_super_error;
596 }
597
598 status = ocfs2_initialize_super(sb, bh, sector_size);
599 osb = OCFS2_SB(sb);
600 if (status < 0) {
601 mlog_errno(status);
602 goto read_super_error;
603 }
604 brelse(bh);
605 bh = NULL;
606 osb->s_mount_opt = parsed_options.mount_opt;
607 osb->s_atime_quantum = parsed_options.atime_quantum;
608 osb->preferred_slot = parsed_options.slot;
609 osb->osb_commit_interval = parsed_options.commit_interval;
610 osb->local_alloc_size = parsed_options.localalloc_opt;
611
612 sb->s_magic = OCFS2_SUPER_MAGIC;
613
614 /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
615 * heartbeat=none */
616 if (bdev_read_only(sb->s_bdev)) {
617 if (!(sb->s_flags & MS_RDONLY)) {
618 status = -EACCES;
619 mlog(ML_ERROR, "Readonly device detected but readonly "
620 "mount was not specified.\n");
621 goto read_super_error;
622 }
623
624 /* You should not be able to start a local heartbeat
625 * on a readonly device. */
626 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
627 status = -EROFS;
628 mlog(ML_ERROR, "Local heartbeat specified on readonly "
629 "device.\n");
630 goto read_super_error;
631 }
632
633 status = ocfs2_check_journals_nolocks(osb);
634 if (status < 0) {
635 if (status == -EROFS)
636 mlog(ML_ERROR, "Recovery required on readonly "
637 "file system, but write access is "
638 "unavailable.\n");
639 else
640 mlog_errno(status);
641 goto read_super_error;
642 }
643
644 ocfs2_set_ro_flag(osb, 1);
645
646 printk(KERN_NOTICE "Readonly device detected. No cluster "
647 "services will be utilized for this mount. Recovery "
648 "will be skipped.\n");
649 }
650
651 if (!ocfs2_is_hard_readonly(osb)) {
652 if (sb->s_flags & MS_RDONLY)
653 ocfs2_set_ro_flag(osb, 0);
654 }
655
656 status = ocfs2_verify_heartbeat(osb);
657 if (status < 0) {
658 mlog_errno(status);
659 goto read_super_error;
660 }
661
662 osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
663 ocfs2_debugfs_root);
664 if (!osb->osb_debug_root) {
665 status = -EINVAL;
666 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
667 goto read_super_error;
668 }
669
670 status = ocfs2_mount_volume(sb);
671 if (osb->root_inode)
672 inode = igrab(osb->root_inode);
673
674 if (status < 0)
675 goto read_super_error;
676
677 if (!inode) {
678 status = -EIO;
679 mlog_errno(status);
680 goto read_super_error;
681 }
682
683 root = d_alloc_root(inode);
684 if (!root) {
685 status = -ENOMEM;
686 mlog_errno(status);
687 goto read_super_error;
688 }
689
690 sb->s_root = root;
691
692 ocfs2_complete_mount_recovery(osb);
693
694 if (ocfs2_mount_local(osb))
695 snprintf(nodestr, sizeof(nodestr), "local");
696 else
697 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
698
699 printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
700 "with %s data mode.\n",
701 osb->dev_str, nodestr, osb->slot_num,
702 osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
703 "ordered");
704
705 atomic_set(&osb->vol_state, VOLUME_MOUNTED);
706 wake_up(&osb->osb_mount_event);
707
708 mlog_exit(status);
709 return status;
710
711 read_super_error:
712 if (bh != NULL)
713 brelse(bh);
714
715 if (inode)
716 iput(inode);
717
718 if (osb) {
719 atomic_set(&osb->vol_state, VOLUME_DISABLED);
720 wake_up(&osb->osb_mount_event);
721 ocfs2_dismount_volume(sb, 1);
722 }
723
724 mlog_exit(status);
725 return status;
726 }
727
728 static int ocfs2_get_sb(struct file_system_type *fs_type,
729 int flags,
730 const char *dev_name,
731 void *data,
732 struct vfsmount *mnt)
733 {
734 return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
735 mnt);
736 }
737
738 static struct file_system_type ocfs2_fs_type = {
739 .owner = THIS_MODULE,
740 .name = "ocfs2",
741 .get_sb = ocfs2_get_sb, /* is this called when we mount
742 * the fs? */
743 .kill_sb = kill_block_super, /* set to the generic one
744 * right now, but do we
745 * need to change that? */
746 .fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
747 .next = NULL
748 };
749
750 static int ocfs2_parse_options(struct super_block *sb,
751 char *options,
752 struct mount_options *mopt,
753 int is_remount)
754 {
755 int status;
756 char *p;
757
758 mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
759 options ? options : "(none)");
760
761 mopt->commit_interval = 0;
762 mopt->mount_opt = 0;
763 mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
764 mopt->slot = OCFS2_INVALID_SLOT;
765 mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
766
767 if (!options) {
768 status = 1;
769 goto bail;
770 }
771
772 while ((p = strsep(&options, ",")) != NULL) {
773 int token, option;
774 substring_t args[MAX_OPT_ARGS];
775
776 if (!*p)
777 continue;
778
779 token = match_token(p, tokens, args);
780 switch (token) {
781 case Opt_hb_local:
782 mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
783 break;
784 case Opt_hb_none:
785 mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
786 break;
787 case Opt_barrier:
788 if (match_int(&args[0], &option)) {
789 status = 0;
790 goto bail;
791 }
792 if (option)
793 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
794 else
795 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
796 break;
797 case Opt_intr:
798 mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
799 break;
800 case Opt_nointr:
801 mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
802 break;
803 case Opt_err_panic:
804 mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
805 break;
806 case Opt_err_ro:
807 mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
808 break;
809 case Opt_data_ordered:
810 mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
811 break;
812 case Opt_data_writeback:
813 mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
814 break;
815 case Opt_atime_quantum:
816 if (match_int(&args[0], &option)) {
817 status = 0;
818 goto bail;
819 }
820 if (option >= 0)
821 mopt->atime_quantum = option;
822 break;
823 case Opt_slot:
824 option = 0;
825 if (match_int(&args[0], &option)) {
826 status = 0;
827 goto bail;
828 }
829 if (option)
830 mopt->slot = (s16)option;
831 break;
832 case Opt_commit:
833 option = 0;
834 if (match_int(&args[0], &option)) {
835 status = 0;
836 goto bail;
837 }
838 if (option < 0)
839 return 0;
840 if (option == 0)
841 option = JBD_DEFAULT_MAX_COMMIT_AGE;
842 mopt->commit_interval = HZ * option;
843 break;
844 case Opt_localalloc:
845 option = 0;
846 if (match_int(&args[0], &option)) {
847 status = 0;
848 goto bail;
849 }
850 if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
851 mopt->localalloc_opt = option;
852 break;
853 case Opt_localflocks:
854 /*
855 * Changing this during remount could race
856 * flock() requests, or "unbalance" existing
857 * ones (e.g., a lock is taken in one mode but
858 * dropped in the other). If users care enough
859 * to flip locking modes during remount, we
860 * could add a "local" flag to individual
861 * flock structures for proper tracking of
862 * state.
863 */
864 if (!is_remount)
865 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
866 break;
867 default:
868 mlog(ML_ERROR,
869 "Unrecognized mount option \"%s\" "
870 "or missing value\n", p);
871 status = 0;
872 goto bail;
873 }
874 }
875
876 status = 1;
877
878 bail:
879 mlog_exit(status);
880 return status;
881 }
882
883 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
884 {
885 struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
886 unsigned long opts = osb->s_mount_opt;
887
888 if (opts & OCFS2_MOUNT_HB_LOCAL)
889 seq_printf(s, ",_netdev,heartbeat=local");
890 else
891 seq_printf(s, ",heartbeat=none");
892
893 if (opts & OCFS2_MOUNT_NOINTR)
894 seq_printf(s, ",nointr");
895
896 if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
897 seq_printf(s, ",data=writeback");
898 else
899 seq_printf(s, ",data=ordered");
900
901 if (opts & OCFS2_MOUNT_BARRIER)
902 seq_printf(s, ",barrier=1");
903
904 if (opts & OCFS2_MOUNT_ERRORS_PANIC)
905 seq_printf(s, ",errors=panic");
906 else
907 seq_printf(s, ",errors=remount-ro");
908
909 if (osb->preferred_slot != OCFS2_INVALID_SLOT)
910 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
911
912 if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
913 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
914
915 if (osb->osb_commit_interval)
916 seq_printf(s, ",commit=%u",
917 (unsigned) (osb->osb_commit_interval / HZ));
918
919 if (osb->local_alloc_size != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
920 seq_printf(s, ",localalloc=%d", osb->local_alloc_size);
921
922 if (opts & OCFS2_MOUNT_LOCALFLOCKS)
923 seq_printf(s, ",localflocks,");
924
925 return 0;
926 }
927
928 static int __init ocfs2_init(void)
929 {
930 int status;
931
932 mlog_entry_void();
933
934 ocfs2_print_version();
935
936 status = init_ocfs2_uptodate_cache();
937 if (status < 0) {
938 mlog_errno(status);
939 goto leave;
940 }
941
942 status = ocfs2_initialize_mem_caches();
943 if (status < 0) {
944 mlog_errno(status);
945 goto leave;
946 }
947
948 ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
949 if (!ocfs2_wq) {
950 status = -ENOMEM;
951 goto leave;
952 }
953
954 ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
955 if (!ocfs2_debugfs_root) {
956 status = -EFAULT;
957 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
958 }
959
960 leave:
961 if (status < 0) {
962 ocfs2_free_mem_caches();
963 exit_ocfs2_uptodate_cache();
964 }
965
966 mlog_exit(status);
967
968 if (status >= 0) {
969 return register_filesystem(&ocfs2_fs_type);
970 } else
971 return -1;
972 }
973
974 static void __exit ocfs2_exit(void)
975 {
976 mlog_entry_void();
977
978 if (ocfs2_wq) {
979 flush_workqueue(ocfs2_wq);
980 destroy_workqueue(ocfs2_wq);
981 }
982
983 debugfs_remove(ocfs2_debugfs_root);
984
985 ocfs2_free_mem_caches();
986
987 unregister_filesystem(&ocfs2_fs_type);
988
989 exit_ocfs2_uptodate_cache();
990
991 mlog_exit_void();
992 }
993
994 static void ocfs2_put_super(struct super_block *sb)
995 {
996 mlog_entry("(0x%p)\n", sb);
997
998 ocfs2_sync_blockdev(sb);
999 ocfs2_dismount_volume(sb, 0);
1000
1001 mlog_exit_void();
1002 }
1003
1004 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1005 {
1006 struct ocfs2_super *osb;
1007 u32 numbits, freebits;
1008 int status;
1009 struct ocfs2_dinode *bm_lock;
1010 struct buffer_head *bh = NULL;
1011 struct inode *inode = NULL;
1012
1013 mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1014
1015 osb = OCFS2_SB(dentry->d_sb);
1016
1017 inode = ocfs2_get_system_file_inode(osb,
1018 GLOBAL_BITMAP_SYSTEM_INODE,
1019 OCFS2_INVALID_SLOT);
1020 if (!inode) {
1021 mlog(ML_ERROR, "failed to get bitmap inode\n");
1022 status = -EIO;
1023 goto bail;
1024 }
1025
1026 status = ocfs2_inode_lock(inode, &bh, 0);
1027 if (status < 0) {
1028 mlog_errno(status);
1029 goto bail;
1030 }
1031
1032 bm_lock = (struct ocfs2_dinode *) bh->b_data;
1033
1034 numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1035 freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1036
1037 buf->f_type = OCFS2_SUPER_MAGIC;
1038 buf->f_bsize = dentry->d_sb->s_blocksize;
1039 buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1040 buf->f_blocks = ((sector_t) numbits) *
1041 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1042 buf->f_bfree = ((sector_t) freebits) *
1043 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1044 buf->f_bavail = buf->f_bfree;
1045 buf->f_files = numbits;
1046 buf->f_ffree = freebits;
1047
1048 brelse(bh);
1049
1050 ocfs2_inode_unlock(inode, 0);
1051 status = 0;
1052 bail:
1053 if (inode)
1054 iput(inode);
1055
1056 mlog_exit(status);
1057
1058 return status;
1059 }
1060
1061 static void ocfs2_inode_init_once(struct kmem_cache *cachep, void *data)
1062 {
1063 struct ocfs2_inode_info *oi = data;
1064
1065 oi->ip_flags = 0;
1066 oi->ip_open_count = 0;
1067 spin_lock_init(&oi->ip_lock);
1068 ocfs2_extent_map_init(&oi->vfs_inode);
1069 INIT_LIST_HEAD(&oi->ip_io_markers);
1070 oi->ip_created_trans = 0;
1071 oi->ip_last_trans = 0;
1072 oi->ip_dir_start_lookup = 0;
1073
1074 init_rwsem(&oi->ip_alloc_sem);
1075 mutex_init(&oi->ip_io_mutex);
1076
1077 oi->ip_blkno = 0ULL;
1078 oi->ip_clusters = 0;
1079
1080 ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1081 ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1082 ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1083
1084 ocfs2_metadata_cache_init(&oi->vfs_inode);
1085
1086 inode_init_once(&oi->vfs_inode);
1087 }
1088
1089 static int ocfs2_initialize_mem_caches(void)
1090 {
1091 ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1092 sizeof(struct ocfs2_inode_info),
1093 0,
1094 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1095 SLAB_MEM_SPREAD),
1096 ocfs2_inode_init_once);
1097 if (!ocfs2_inode_cachep)
1098 return -ENOMEM;
1099
1100 return 0;
1101 }
1102
1103 static void ocfs2_free_mem_caches(void)
1104 {
1105 if (ocfs2_inode_cachep)
1106 kmem_cache_destroy(ocfs2_inode_cachep);
1107
1108 ocfs2_inode_cachep = NULL;
1109 }
1110
1111 static int ocfs2_get_sector(struct super_block *sb,
1112 struct buffer_head **bh,
1113 int block,
1114 int sect_size)
1115 {
1116 if (!sb_set_blocksize(sb, sect_size)) {
1117 mlog(ML_ERROR, "unable to set blocksize\n");
1118 return -EIO;
1119 }
1120
1121 *bh = sb_getblk(sb, block);
1122 if (!*bh) {
1123 mlog_errno(-EIO);
1124 return -EIO;
1125 }
1126 lock_buffer(*bh);
1127 if (!buffer_dirty(*bh))
1128 clear_buffer_uptodate(*bh);
1129 unlock_buffer(*bh);
1130 ll_rw_block(READ, 1, bh);
1131 wait_on_buffer(*bh);
1132 return 0;
1133 }
1134
1135 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1136 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1137 {
1138 int status;
1139
1140 /* XXX hold a ref on the node while mounte? easy enough, if
1141 * desirable. */
1142 if (ocfs2_mount_local(osb))
1143 osb->node_num = 0;
1144 else
1145 osb->node_num = o2nm_this_node();
1146
1147 if (osb->node_num == O2NM_MAX_NODES) {
1148 mlog(ML_ERROR, "could not find this host's node number\n");
1149 status = -ENOENT;
1150 goto bail;
1151 }
1152
1153 mlog(0, "I am node %d\n", osb->node_num);
1154
1155 status = 0;
1156 bail:
1157 return status;
1158 }
1159
1160 static int ocfs2_mount_volume(struct super_block *sb)
1161 {
1162 int status = 0;
1163 int unlock_super = 0;
1164 struct ocfs2_super *osb = OCFS2_SB(sb);
1165
1166 mlog_entry_void();
1167
1168 if (ocfs2_is_hard_readonly(osb))
1169 goto leave;
1170
1171 status = ocfs2_fill_local_node_info(osb);
1172 if (status < 0) {
1173 mlog_errno(status);
1174 goto leave;
1175 }
1176
1177 status = ocfs2_dlm_init(osb);
1178 if (status < 0) {
1179 mlog_errno(status);
1180 goto leave;
1181 }
1182
1183 status = ocfs2_super_lock(osb, 1);
1184 if (status < 0) {
1185 mlog_errno(status);
1186 goto leave;
1187 }
1188 unlock_super = 1;
1189
1190 /* This will load up the node map and add ourselves to it. */
1191 status = ocfs2_find_slot(osb);
1192 if (status < 0) {
1193 mlog_errno(status);
1194 goto leave;
1195 }
1196
1197 /* load all node-local system inodes */
1198 status = ocfs2_init_local_system_inodes(osb);
1199 if (status < 0) {
1200 mlog_errno(status);
1201 goto leave;
1202 }
1203
1204 status = ocfs2_check_volume(osb);
1205 if (status < 0) {
1206 mlog_errno(status);
1207 goto leave;
1208 }
1209
1210 status = ocfs2_truncate_log_init(osb);
1211 if (status < 0) {
1212 mlog_errno(status);
1213 goto leave;
1214 }
1215
1216 if (ocfs2_mount_local(osb))
1217 goto leave;
1218
1219 leave:
1220 if (unlock_super)
1221 ocfs2_super_unlock(osb, 1);
1222
1223 mlog_exit(status);
1224 return status;
1225 }
1226
1227 /* we can't grab the goofy sem lock from inside wait_event, so we use
1228 * memory barriers to make sure that we'll see the null task before
1229 * being woken up */
1230 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1231 {
1232 mb();
1233 return osb->recovery_thread_task != NULL;
1234 }
1235
1236 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1237 {
1238 int tmp;
1239 struct ocfs2_super *osb = NULL;
1240 char nodestr[8];
1241
1242 mlog_entry("(0x%p)\n", sb);
1243
1244 BUG_ON(!sb);
1245 osb = OCFS2_SB(sb);
1246 BUG_ON(!osb);
1247
1248 ocfs2_shutdown_local_alloc(osb);
1249
1250 ocfs2_truncate_log_shutdown(osb);
1251
1252 /* disable any new recovery threads and wait for any currently
1253 * running ones to exit. Do this before setting the vol_state. */
1254 mutex_lock(&osb->recovery_lock);
1255 osb->disable_recovery = 1;
1256 mutex_unlock(&osb->recovery_lock);
1257 wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1258
1259 /* At this point, we know that no more recovery threads can be
1260 * launched, so wait for any recovery completion work to
1261 * complete. */
1262 flush_workqueue(ocfs2_wq);
1263
1264 ocfs2_journal_shutdown(osb);
1265
1266 ocfs2_sync_blockdev(sb);
1267
1268 /* No dlm means we've failed during mount, so skip all the
1269 * steps which depended on that to complete. */
1270 if (osb->dlm) {
1271 tmp = ocfs2_super_lock(osb, 1);
1272 if (tmp < 0) {
1273 mlog_errno(tmp);
1274 return;
1275 }
1276 }
1277
1278 if (osb->slot_num != OCFS2_INVALID_SLOT)
1279 ocfs2_put_slot(osb);
1280
1281 if (osb->dlm)
1282 ocfs2_super_unlock(osb, 1);
1283
1284 ocfs2_release_system_inodes(osb);
1285
1286 if (osb->dlm)
1287 ocfs2_dlm_shutdown(osb);
1288
1289 debugfs_remove(osb->osb_debug_root);
1290
1291 if (!mnt_err)
1292 ocfs2_stop_heartbeat(osb);
1293
1294 atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1295
1296 if (ocfs2_mount_local(osb))
1297 snprintf(nodestr, sizeof(nodestr), "local");
1298 else
1299 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1300
1301 printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1302 osb->dev_str, nodestr);
1303
1304 ocfs2_delete_osb(osb);
1305 kfree(osb);
1306 sb->s_dev = 0;
1307 sb->s_fs_info = NULL;
1308 }
1309
1310 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1311 unsigned uuid_bytes)
1312 {
1313 int i, ret;
1314 char *ptr;
1315
1316 BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1317
1318 osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1319 if (osb->uuid_str == NULL)
1320 return -ENOMEM;
1321
1322 for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1323 /* print with null */
1324 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1325 if (ret != 2) /* drop super cleans up */
1326 return -EINVAL;
1327 /* then only advance past the last char */
1328 ptr += 2;
1329 }
1330
1331 return 0;
1332 }
1333
1334 static int ocfs2_initialize_super(struct super_block *sb,
1335 struct buffer_head *bh,
1336 int sector_size)
1337 {
1338 int status;
1339 int i, cbits, bbits;
1340 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1341 struct inode *inode = NULL;
1342 struct ocfs2_journal *journal;
1343 __le32 uuid_net_key;
1344 struct ocfs2_super *osb;
1345
1346 mlog_entry_void();
1347
1348 osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1349 if (!osb) {
1350 status = -ENOMEM;
1351 mlog_errno(status);
1352 goto bail;
1353 }
1354
1355 sb->s_fs_info = osb;
1356 sb->s_op = &ocfs2_sops;
1357 sb->s_export_op = &ocfs2_export_ops;
1358 sb->s_time_gran = 1;
1359 sb->s_flags |= MS_NOATIME;
1360 /* this is needed to support O_LARGEFILE */
1361 cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1362 bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1363 sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1364
1365 osb->sb = sb;
1366 /* Save off for ocfs2_rw_direct */
1367 osb->s_sectsize_bits = blksize_bits(sector_size);
1368 BUG_ON(!osb->s_sectsize_bits);
1369
1370 init_waitqueue_head(&osb->recovery_event);
1371 spin_lock_init(&osb->dc_task_lock);
1372 init_waitqueue_head(&osb->dc_event);
1373 osb->dc_work_sequence = 0;
1374 osb->dc_wake_sequence = 0;
1375 INIT_LIST_HEAD(&osb->blocked_lock_list);
1376 osb->blocked_lock_count = 0;
1377 spin_lock_init(&osb->osb_lock);
1378
1379 atomic_set(&osb->alloc_stats.moves, 0);
1380 atomic_set(&osb->alloc_stats.local_data, 0);
1381 atomic_set(&osb->alloc_stats.bitmap_data, 0);
1382 atomic_set(&osb->alloc_stats.bg_allocs, 0);
1383 atomic_set(&osb->alloc_stats.bg_extends, 0);
1384
1385 ocfs2_init_node_maps(osb);
1386
1387 snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1388 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1389
1390 mutex_init(&osb->recovery_lock);
1391
1392 osb->disable_recovery = 0;
1393 osb->recovery_thread_task = NULL;
1394
1395 init_waitqueue_head(&osb->checkpoint_event);
1396 atomic_set(&osb->needs_checkpoint, 0);
1397
1398 osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1399
1400 osb->node_num = O2NM_INVALID_NODE_NUM;
1401 osb->slot_num = OCFS2_INVALID_SLOT;
1402
1403 osb->local_alloc_state = OCFS2_LA_UNUSED;
1404 osb->local_alloc_bh = NULL;
1405
1406 ocfs2_setup_hb_callbacks(osb);
1407
1408 init_waitqueue_head(&osb->osb_mount_event);
1409
1410 osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1411 if (!osb->vol_label) {
1412 mlog(ML_ERROR, "unable to alloc vol label\n");
1413 status = -ENOMEM;
1414 goto bail;
1415 }
1416
1417 osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1418 if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1419 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1420 osb->max_slots);
1421 status = -EINVAL;
1422 goto bail;
1423 }
1424 mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1425
1426 init_waitqueue_head(&osb->osb_wipe_event);
1427 osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1428 sizeof(*osb->osb_orphan_wipes),
1429 GFP_KERNEL);
1430 if (!osb->osb_orphan_wipes) {
1431 status = -ENOMEM;
1432 mlog_errno(status);
1433 goto bail;
1434 }
1435
1436 osb->s_feature_compat =
1437 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1438 osb->s_feature_ro_compat =
1439 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1440 osb->s_feature_incompat =
1441 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1442
1443 if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1444 mlog(ML_ERROR, "couldn't mount because of unsupported "
1445 "optional features (%x).\n", i);
1446 status = -EINVAL;
1447 goto bail;
1448 }
1449 if (!(osb->sb->s_flags & MS_RDONLY) &&
1450 (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1451 mlog(ML_ERROR, "couldn't mount RDWR because of "
1452 "unsupported optional features (%x).\n", i);
1453 status = -EINVAL;
1454 goto bail;
1455 }
1456
1457 get_random_bytes(&osb->s_next_generation, sizeof(u32));
1458
1459 /* FIXME
1460 * This should be done in ocfs2_journal_init(), but unknown
1461 * ordering issues will cause the filesystem to crash.
1462 * If anyone wants to figure out what part of the code
1463 * refers to osb->journal before ocfs2_journal_init() is run,
1464 * be my guest.
1465 */
1466 /* initialize our journal structure */
1467
1468 journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1469 if (!journal) {
1470 mlog(ML_ERROR, "unable to alloc journal\n");
1471 status = -ENOMEM;
1472 goto bail;
1473 }
1474 osb->journal = journal;
1475 journal->j_osb = osb;
1476
1477 atomic_set(&journal->j_num_trans, 0);
1478 init_rwsem(&journal->j_trans_barrier);
1479 init_waitqueue_head(&journal->j_checkpointed);
1480 spin_lock_init(&journal->j_lock);
1481 journal->j_trans_id = (unsigned long) 1;
1482 INIT_LIST_HEAD(&journal->j_la_cleanups);
1483 INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1484 journal->j_state = OCFS2_JOURNAL_FREE;
1485
1486 /* get some pseudo constants for clustersize bits */
1487 osb->s_clustersize_bits =
1488 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1489 osb->s_clustersize = 1 << osb->s_clustersize_bits;
1490 mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1491
1492 if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1493 osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1494 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1495 osb->s_clustersize);
1496 status = -EINVAL;
1497 goto bail;
1498 }
1499
1500 if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1501 > (u32)~0UL) {
1502 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1503 "what jbd can address in 32 bits.\n");
1504 status = -EINVAL;
1505 goto bail;
1506 }
1507
1508 if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1509 sizeof(di->id2.i_super.s_uuid))) {
1510 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1511 status = -ENOMEM;
1512 goto bail;
1513 }
1514
1515 memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1516
1517 strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1518 osb->vol_label[63] = '\0';
1519 osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1520 osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1521 osb->first_cluster_group_blkno =
1522 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1523 osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1524 mlog(0, "vol_label: %s\n", osb->vol_label);
1525 mlog(0, "uuid: %s\n", osb->uuid_str);
1526 mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1527 (unsigned long long)osb->root_blkno,
1528 (unsigned long long)osb->system_dir_blkno);
1529
1530 osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1531 if (!osb->osb_dlm_debug) {
1532 status = -ENOMEM;
1533 mlog_errno(status);
1534 goto bail;
1535 }
1536
1537 atomic_set(&osb->vol_state, VOLUME_INIT);
1538
1539 /* load root, system_dir, and all global system inodes */
1540 status = ocfs2_init_global_system_inodes(osb);
1541 if (status < 0) {
1542 mlog_errno(status);
1543 goto bail;
1544 }
1545
1546 /*
1547 * global bitmap
1548 */
1549 inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1550 OCFS2_INVALID_SLOT);
1551 if (!inode) {
1552 status = -EINVAL;
1553 mlog_errno(status);
1554 goto bail;
1555 }
1556
1557 osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1558 iput(inode);
1559
1560 osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1561
1562 status = ocfs2_init_slot_info(osb);
1563 if (status < 0) {
1564 mlog_errno(status);
1565 goto bail;
1566 }
1567
1568 bail:
1569 mlog_exit(status);
1570 return status;
1571 }
1572
1573 /*
1574 * will return: -EAGAIN if it is ok to keep searching for superblocks
1575 * -EINVAL if there is a bad superblock
1576 * 0 on success
1577 */
1578 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1579 struct buffer_head *bh,
1580 u32 blksz)
1581 {
1582 int status = -EAGAIN;
1583
1584 mlog_entry_void();
1585
1586 if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1587 strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1588 status = -EINVAL;
1589 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1590 mlog(ML_ERROR, "found superblock with incorrect block "
1591 "size: found %u, should be %u\n",
1592 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1593 blksz);
1594 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1595 OCFS2_MAJOR_REV_LEVEL ||
1596 le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1597 OCFS2_MINOR_REV_LEVEL) {
1598 mlog(ML_ERROR, "found superblock with bad version: "
1599 "found %u.%u, should be %u.%u\n",
1600 le16_to_cpu(di->id2.i_super.s_major_rev_level),
1601 le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1602 OCFS2_MAJOR_REV_LEVEL,
1603 OCFS2_MINOR_REV_LEVEL);
1604 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1605 mlog(ML_ERROR, "bad block number on superblock: "
1606 "found %llu, should be %llu\n",
1607 (unsigned long long)le64_to_cpu(di->i_blkno),
1608 (unsigned long long)bh->b_blocknr);
1609 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1610 le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1611 mlog(ML_ERROR, "bad cluster size found: %u\n",
1612 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1613 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1614 mlog(ML_ERROR, "bad root_blkno: 0\n");
1615 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1616 mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1617 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1618 mlog(ML_ERROR,
1619 "Superblock slots found greater than file system "
1620 "maximum: found %u, max %u\n",
1621 le16_to_cpu(di->id2.i_super.s_max_slots),
1622 OCFS2_MAX_SLOTS);
1623 } else {
1624 /* found it! */
1625 status = 0;
1626 }
1627 }
1628
1629 mlog_exit(status);
1630 return status;
1631 }
1632
1633 static int ocfs2_check_volume(struct ocfs2_super *osb)
1634 {
1635 int status;
1636 int dirty;
1637 int local;
1638 struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1639 * recover
1640 * ourselves. */
1641
1642 mlog_entry_void();
1643
1644 /* Init our journal object. */
1645 status = ocfs2_journal_init(osb->journal, &dirty);
1646 if (status < 0) {
1647 mlog(ML_ERROR, "Could not initialize journal!\n");
1648 goto finally;
1649 }
1650
1651 /* If the journal was unmounted cleanly then we don't want to
1652 * recover anything. Otherwise, journal_load will do that
1653 * dirty work for us :) */
1654 if (!dirty) {
1655 status = ocfs2_journal_wipe(osb->journal, 0);
1656 if (status < 0) {
1657 mlog_errno(status);
1658 goto finally;
1659 }
1660 } else {
1661 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1662 "recovering volume.\n");
1663 }
1664
1665 local = ocfs2_mount_local(osb);
1666
1667 /* will play back anything left in the journal. */
1668 ocfs2_journal_load(osb->journal, local);
1669
1670 if (dirty) {
1671 /* recover my local alloc if we didn't unmount cleanly. */
1672 status = ocfs2_begin_local_alloc_recovery(osb,
1673 osb->slot_num,
1674 &local_alloc);
1675 if (status < 0) {
1676 mlog_errno(status);
1677 goto finally;
1678 }
1679 /* we complete the recovery process after we've marked
1680 * ourselves as mounted. */
1681 }
1682
1683 mlog(0, "Journal loaded.\n");
1684
1685 status = ocfs2_load_local_alloc(osb);
1686 if (status < 0) {
1687 mlog_errno(status);
1688 goto finally;
1689 }
1690
1691 if (dirty) {
1692 /* Recovery will be completed after we've mounted the
1693 * rest of the volume. */
1694 osb->dirty = 1;
1695 osb->local_alloc_copy = local_alloc;
1696 local_alloc = NULL;
1697 }
1698
1699 /* go through each journal, trylock it and if you get the
1700 * lock, and it's marked as dirty, set the bit in the recover
1701 * map and launch a recovery thread for it. */
1702 status = ocfs2_mark_dead_nodes(osb);
1703 if (status < 0)
1704 mlog_errno(status);
1705
1706 finally:
1707 if (local_alloc)
1708 kfree(local_alloc);
1709
1710 mlog_exit(status);
1711 return status;
1712 }
1713
1714 /*
1715 * The routine gets called from dismount or close whenever a dismount on
1716 * volume is requested and the osb open count becomes 1.
1717 * It will remove the osb from the global list and also free up all the
1718 * initialized resources and fileobject.
1719 */
1720 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1721 {
1722 mlog_entry_void();
1723
1724 /* This function assumes that the caller has the main osb resource */
1725
1726 if (osb->slot_info)
1727 ocfs2_free_slot_info(osb->slot_info);
1728
1729 kfree(osb->osb_orphan_wipes);
1730 /* FIXME
1731 * This belongs in journal shutdown, but because we have to
1732 * allocate osb->journal at the start of ocfs2_initalize_osb(),
1733 * we free it here.
1734 */
1735 kfree(osb->journal);
1736 if (osb->local_alloc_copy)
1737 kfree(osb->local_alloc_copy);
1738 kfree(osb->uuid_str);
1739 ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1740 memset(osb, 0, sizeof(struct ocfs2_super));
1741
1742 mlog_exit_void();
1743 }
1744
1745 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1746 * panic(). We do not support continue-on-error operation. */
1747 static void ocfs2_handle_error(struct super_block *sb)
1748 {
1749 struct ocfs2_super *osb = OCFS2_SB(sb);
1750
1751 if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1752 panic("OCFS2: (device %s): panic forced after error\n",
1753 sb->s_id);
1754
1755 ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1756
1757 if (sb->s_flags & MS_RDONLY &&
1758 (ocfs2_is_soft_readonly(osb) ||
1759 ocfs2_is_hard_readonly(osb)))
1760 return;
1761
1762 printk(KERN_CRIT "File system is now read-only due to the potential "
1763 "of on-disk corruption. Please run fsck.ocfs2 once the file "
1764 "system is unmounted.\n");
1765 sb->s_flags |= MS_RDONLY;
1766 ocfs2_set_ro_flag(osb, 0);
1767 }
1768
1769 static char error_buf[1024];
1770
1771 void __ocfs2_error(struct super_block *sb,
1772 const char *function,
1773 const char *fmt, ...)
1774 {
1775 va_list args;
1776
1777 va_start(args, fmt);
1778 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1779 va_end(args);
1780
1781 /* Not using mlog here because we want to show the actual
1782 * function the error came from. */
1783 printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1784 sb->s_id, function, error_buf);
1785
1786 ocfs2_handle_error(sb);
1787 }
1788
1789 /* Handle critical errors. This is intentionally more drastic than
1790 * ocfs2_handle_error, so we only use for things like journal errors,
1791 * etc. */
1792 void __ocfs2_abort(struct super_block* sb,
1793 const char *function,
1794 const char *fmt, ...)
1795 {
1796 va_list args;
1797
1798 va_start(args, fmt);
1799 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1800 va_end(args);
1801
1802 printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1803 sb->s_id, function, error_buf);
1804
1805 /* We don't have the cluster support yet to go straight to
1806 * hard readonly in here. Until then, we want to keep
1807 * ocfs2_abort() so that we can at least mark critical
1808 * errors.
1809 *
1810 * TODO: This should abort the journal and alert other nodes
1811 * that our slot needs recovery. */
1812
1813 /* Force a panic(). This stinks, but it's better than letting
1814 * things continue without having a proper hard readonly
1815 * here. */
1816 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1817 ocfs2_handle_error(sb);
1818 }
1819
1820 module_init(ocfs2_init);
1821 module_exit(ocfs2_exit);
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