xref: /openbmc/linux/fs/ocfs2/super.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
43 #include <cluster/nodemanager.h>
44 
45 #define MLOG_MASK_PREFIX ML_SUPER
46 #include <cluster/masklog.h>
47 
48 #include "ocfs2.h"
49 
50 /* this should be the only file to include a version 1 header */
51 #include "ocfs1_fs_compat.h"
52 
53 #include "alloc.h"
54 #include "dlmglue.h"
55 #include "export.h"
56 #include "extent_map.h"
57 #include "heartbeat.h"
58 #include "inode.h"
59 #include "journal.h"
60 #include "localalloc.h"
61 #include "namei.h"
62 #include "slot_map.h"
63 #include "super.h"
64 #include "sysfile.h"
65 #include "uptodate.h"
66 #include "ver.h"
67 #include "vote.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 static int ocfs2_parse_options(struct super_block *sb, char *options,
85 			       unsigned long *mount_opt, int is_remount);
86 static void ocfs2_put_super(struct super_block *sb);
87 static int ocfs2_mount_volume(struct super_block *sb);
88 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
89 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
90 static int ocfs2_initialize_mem_caches(void);
91 static void ocfs2_free_mem_caches(void);
92 static void ocfs2_delete_osb(struct ocfs2_super *osb);
93 
94 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
95 
96 static int ocfs2_sync_fs(struct super_block *sb, int wait);
97 
98 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
99 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
100 static int ocfs2_release_system_inodes(struct ocfs2_super *osb);
101 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
102 static int ocfs2_check_volume(struct ocfs2_super *osb);
103 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
104 			       struct buffer_head *bh,
105 			       u32 sectsize);
106 static int ocfs2_initialize_super(struct super_block *sb,
107 				  struct buffer_head *bh,
108 				  int sector_size);
109 static int ocfs2_get_sector(struct super_block *sb,
110 			    struct buffer_head **bh,
111 			    int block,
112 			    int sect_size);
113 static void ocfs2_write_super(struct super_block *sb);
114 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
115 static void ocfs2_destroy_inode(struct inode *inode);
116 
117 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift);
118 
119 static const struct super_operations ocfs2_sops = {
120 	.statfs		= ocfs2_statfs,
121 	.alloc_inode	= ocfs2_alloc_inode,
122 	.destroy_inode	= ocfs2_destroy_inode,
123 	.drop_inode	= ocfs2_drop_inode,
124 	.clear_inode	= ocfs2_clear_inode,
125 	.delete_inode	= ocfs2_delete_inode,
126 	.sync_fs	= ocfs2_sync_fs,
127 	.write_super	= ocfs2_write_super,
128 	.put_super	= ocfs2_put_super,
129 	.remount_fs	= ocfs2_remount,
130 };
131 
132 enum {
133 	Opt_barrier,
134 	Opt_err_panic,
135 	Opt_err_ro,
136 	Opt_intr,
137 	Opt_nointr,
138 	Opt_hb_none,
139 	Opt_hb_local,
140 	Opt_data_ordered,
141 	Opt_data_writeback,
142 	Opt_atime_quantum,
143 	Opt_err,
144 };
145 
146 static match_table_t tokens = {
147 	{Opt_barrier, "barrier=%u"},
148 	{Opt_err_panic, "errors=panic"},
149 	{Opt_err_ro, "errors=remount-ro"},
150 	{Opt_intr, "intr"},
151 	{Opt_nointr, "nointr"},
152 	{Opt_hb_none, OCFS2_HB_NONE},
153 	{Opt_hb_local, OCFS2_HB_LOCAL},
154 	{Opt_data_ordered, "data=ordered"},
155 	{Opt_data_writeback, "data=writeback"},
156 	{Opt_atime_quantum, "atime_quantum=%u"},
157 	{Opt_err, NULL}
158 };
159 
160 /*
161  * write_super and sync_fs ripped right out of ext3.
162  */
163 static void ocfs2_write_super(struct super_block *sb)
164 {
165 	if (mutex_trylock(&sb->s_lock) != 0)
166 		BUG();
167 	sb->s_dirt = 0;
168 }
169 
170 static int ocfs2_sync_fs(struct super_block *sb, int wait)
171 {
172 	int status = 0;
173 	tid_t target;
174 	struct ocfs2_super *osb = OCFS2_SB(sb);
175 
176 	sb->s_dirt = 0;
177 
178 	if (ocfs2_is_hard_readonly(osb))
179 		return -EROFS;
180 
181 	if (wait) {
182 		status = ocfs2_flush_truncate_log(osb);
183 		if (status < 0)
184 			mlog_errno(status);
185 	} else {
186 		ocfs2_schedule_truncate_log_flush(osb, 0);
187 	}
188 
189 	if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
190 		if (wait)
191 			log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
192 					target);
193 	}
194 	return 0;
195 }
196 
197 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
198 {
199 	struct inode *new = NULL;
200 	int status = 0;
201 	int i;
202 
203 	mlog_entry_void();
204 
205 	new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
206 	if (IS_ERR(new)) {
207 		status = PTR_ERR(new);
208 		mlog_errno(status);
209 		goto bail;
210 	}
211 	osb->root_inode = new;
212 
213 	new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
214 	if (IS_ERR(new)) {
215 		status = PTR_ERR(new);
216 		mlog_errno(status);
217 		goto bail;
218 	}
219 	osb->sys_root_inode = new;
220 
221 	for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
222 	     i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
223 		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
224 		if (!new) {
225 			ocfs2_release_system_inodes(osb);
226 			status = -EINVAL;
227 			mlog_errno(status);
228 			/* FIXME: Should ERROR_RO_FS */
229 			mlog(ML_ERROR, "Unable to load system inode %d, "
230 			     "possibly corrupt fs?", i);
231 			goto bail;
232 		}
233 		// the array now has one ref, so drop this one
234 		iput(new);
235 	}
236 
237 bail:
238 	mlog_exit(status);
239 	return status;
240 }
241 
242 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
243 {
244 	struct inode *new = NULL;
245 	int status = 0;
246 	int i;
247 
248 	mlog_entry_void();
249 
250 	for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
251 	     i < NUM_SYSTEM_INODES;
252 	     i++) {
253 		new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
254 		if (!new) {
255 			ocfs2_release_system_inodes(osb);
256 			status = -EINVAL;
257 			mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
258 			     status, i, osb->slot_num);
259 			goto bail;
260 		}
261 		/* the array now has one ref, so drop this one */
262 		iput(new);
263 	}
264 
265 bail:
266 	mlog_exit(status);
267 	return status;
268 }
269 
270 static int ocfs2_release_system_inodes(struct ocfs2_super *osb)
271 {
272 	int status = 0, i;
273 	struct inode *inode;
274 
275 	mlog_entry_void();
276 
277 	for (i = 0; i < NUM_SYSTEM_INODES; i++) {
278 		inode = osb->system_inodes[i];
279 		if (inode) {
280 			iput(inode);
281 			osb->system_inodes[i] = NULL;
282 		}
283 	}
284 
285 	inode = osb->sys_root_inode;
286 	if (inode) {
287 		iput(inode);
288 		osb->sys_root_inode = NULL;
289 	}
290 
291 	inode = osb->root_inode;
292 	if (inode) {
293 		iput(inode);
294 		osb->root_inode = NULL;
295 	}
296 
297 	mlog_exit(status);
298 	return status;
299 }
300 
301 /* We're allocating fs objects, use GFP_NOFS */
302 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
303 {
304 	struct ocfs2_inode_info *oi;
305 
306 	oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
307 	if (!oi)
308 		return NULL;
309 
310 	return &oi->vfs_inode;
311 }
312 
313 static void ocfs2_destroy_inode(struct inode *inode)
314 {
315 	kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
316 }
317 
318 /* From xfs_super.c:xfs_max_file_offset
319  * Copyright (c) 2000-2004 Silicon Graphics, Inc.
320  */
321 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift)
322 {
323 	unsigned int pagefactor = 1;
324 	unsigned int bitshift = BITS_PER_LONG - 1;
325 
326 	/* Figure out maximum filesize, on Linux this can depend on
327 	 * the filesystem blocksize (on 32 bit platforms).
328 	 * __block_prepare_write does this in an [unsigned] long...
329 	 *      page->index << (PAGE_CACHE_SHIFT - bbits)
330 	 * So, for page sized blocks (4K on 32 bit platforms),
331 	 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
332 	 *      (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
333 	 * but for smaller blocksizes it is less (bbits = log2 bsize).
334 	 * Note1: get_block_t takes a long (implicit cast from above)
335 	 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
336 	 * can optionally convert the [unsigned] long from above into
337 	 * an [unsigned] long long.
338 	 */
339 
340 #if BITS_PER_LONG == 32
341 # if defined(CONFIG_LBD)
342 	BUILD_BUG_ON(sizeof(sector_t) != 8);
343 	pagefactor = PAGE_CACHE_SIZE;
344 	bitshift = BITS_PER_LONG;
345 # else
346 	pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
347 # endif
348 #endif
349 
350 	return (((unsigned long long)pagefactor) << bitshift) - 1;
351 }
352 
353 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
354 {
355 	int incompat_features;
356 	int ret = 0;
357 	unsigned long parsed_options;
358 	struct ocfs2_super *osb = OCFS2_SB(sb);
359 
360 	if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
361 		ret = -EINVAL;
362 		goto out;
363 	}
364 
365 	if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
366 	    (parsed_options & OCFS2_MOUNT_HB_LOCAL)) {
367 		ret = -EINVAL;
368 		mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
369 		goto out;
370 	}
371 
372 	if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
373 	    (parsed_options & OCFS2_MOUNT_DATA_WRITEBACK)) {
374 		ret = -EINVAL;
375 		mlog(ML_ERROR, "Cannot change data mode on remount\n");
376 		goto out;
377 	}
378 
379 	/* We're going to/from readonly mode. */
380 	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
381 		/* Lock here so the check of HARD_RO and the potential
382 		 * setting of SOFT_RO is atomic. */
383 		spin_lock(&osb->osb_lock);
384 		if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
385 			mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
386 			ret = -EROFS;
387 			goto unlock_osb;
388 		}
389 
390 		if (*flags & MS_RDONLY) {
391 			mlog(0, "Going to ro mode.\n");
392 			sb->s_flags |= MS_RDONLY;
393 			osb->osb_flags |= OCFS2_OSB_SOFT_RO;
394 		} else {
395 			mlog(0, "Making ro filesystem writeable.\n");
396 
397 			if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
398 				mlog(ML_ERROR, "Cannot remount RDWR "
399 				     "filesystem due to previous errors.\n");
400 				ret = -EROFS;
401 				goto unlock_osb;
402 			}
403 			incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
404 			if (incompat_features) {
405 				mlog(ML_ERROR, "Cannot remount RDWR because "
406 				     "of unsupported optional features "
407 				     "(%x).\n", incompat_features);
408 				ret = -EINVAL;
409 				goto unlock_osb;
410 			}
411 			sb->s_flags &= ~MS_RDONLY;
412 			osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
413 		}
414 unlock_osb:
415 		spin_unlock(&osb->osb_lock);
416 	}
417 
418 	if (!ret) {
419 		if (!ocfs2_is_hard_readonly(osb))
420 			ocfs2_set_journal_params(osb);
421 
422 		/* Only save off the new mount options in case of a successful
423 		 * remount. */
424 		osb->s_mount_opt = parsed_options;
425 	}
426 out:
427 	return ret;
428 }
429 
430 static int ocfs2_sb_probe(struct super_block *sb,
431 			  struct buffer_head **bh,
432 			  int *sector_size)
433 {
434 	int status = 0, tmpstat;
435 	struct ocfs1_vol_disk_hdr *hdr;
436 	struct ocfs2_dinode *di;
437 	int blksize;
438 
439 	*bh = NULL;
440 
441 	/* may be > 512 */
442 	*sector_size = bdev_hardsect_size(sb->s_bdev);
443 	if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
444 		mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
445 		     *sector_size, OCFS2_MAX_BLOCKSIZE);
446 		status = -EINVAL;
447 		goto bail;
448 	}
449 
450 	/* Can this really happen? */
451 	if (*sector_size < OCFS2_MIN_BLOCKSIZE)
452 		*sector_size = OCFS2_MIN_BLOCKSIZE;
453 
454 	/* check block zero for old format */
455 	status = ocfs2_get_sector(sb, bh, 0, *sector_size);
456 	if (status < 0) {
457 		mlog_errno(status);
458 		goto bail;
459 	}
460 	hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
461 	if (hdr->major_version == OCFS1_MAJOR_VERSION) {
462 		mlog(ML_ERROR, "incompatible version: %u.%u\n",
463 		     hdr->major_version, hdr->minor_version);
464 		status = -EINVAL;
465 	}
466 	if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
467 		   strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
468 		mlog(ML_ERROR, "incompatible volume signature: %8s\n",
469 		     hdr->signature);
470 		status = -EINVAL;
471 	}
472 	brelse(*bh);
473 	*bh = NULL;
474 	if (status < 0) {
475 		mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
476 		     "upgraded before mounting with ocfs v2\n");
477 		goto bail;
478 	}
479 
480 	/*
481 	 * Now check at magic offset for 512, 1024, 2048, 4096
482 	 * blocksizes.  4096 is the maximum blocksize because it is
483 	 * the minimum clustersize.
484 	 */
485 	status = -EINVAL;
486 	for (blksize = *sector_size;
487 	     blksize <= OCFS2_MAX_BLOCKSIZE;
488 	     blksize <<= 1) {
489 		tmpstat = ocfs2_get_sector(sb, bh,
490 					   OCFS2_SUPER_BLOCK_BLKNO,
491 					   blksize);
492 		if (tmpstat < 0) {
493 			status = tmpstat;
494 			mlog_errno(status);
495 			goto bail;
496 		}
497 		di = (struct ocfs2_dinode *) (*bh)->b_data;
498 		status = ocfs2_verify_volume(di, *bh, blksize);
499 		if (status >= 0)
500 			goto bail;
501 		brelse(*bh);
502 		*bh = NULL;
503 		if (status != -EAGAIN)
504 			break;
505 	}
506 
507 bail:
508 	return status;
509 }
510 
511 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
512 {
513 	if (ocfs2_mount_local(osb)) {
514 		if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
515 			mlog(ML_ERROR, "Cannot heartbeat on a locally "
516 			     "mounted device.\n");
517 			return -EINVAL;
518 		}
519 	}
520 
521 	if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
522 		if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
523 			mlog(ML_ERROR, "Heartbeat has to be started to mount "
524 			     "a read-write clustered device.\n");
525 			return -EINVAL;
526 		}
527 	}
528 
529 	return 0;
530 }
531 
532 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
533 {
534 	struct dentry *root;
535 	int status, sector_size;
536 	unsigned long parsed_opt;
537 	struct inode *inode = NULL;
538 	struct ocfs2_super *osb = NULL;
539 	struct buffer_head *bh = NULL;
540 	char nodestr[8];
541 
542 	mlog_entry("%p, %p, %i", sb, data, silent);
543 
544 	if (!ocfs2_parse_options(sb, data, &parsed_opt, 0)) {
545 		status = -EINVAL;
546 		goto read_super_error;
547 	}
548 
549 	/* for now we only have one cluster/node, make sure we see it
550 	 * in the heartbeat universe */
551 	if (parsed_opt & OCFS2_MOUNT_HB_LOCAL) {
552 		if (!o2hb_check_local_node_heartbeating()) {
553 			status = -EINVAL;
554 			goto read_super_error;
555 		}
556 	}
557 
558 	/* probe for superblock */
559 	status = ocfs2_sb_probe(sb, &bh, &sector_size);
560 	if (status < 0) {
561 		mlog(ML_ERROR, "superblock probe failed!\n");
562 		goto read_super_error;
563 	}
564 
565 	status = ocfs2_initialize_super(sb, bh, sector_size);
566 	osb = OCFS2_SB(sb);
567 	if (status < 0) {
568 		mlog_errno(status);
569 		goto read_super_error;
570 	}
571 	brelse(bh);
572 	bh = NULL;
573 	osb->s_mount_opt = parsed_opt;
574 
575 	sb->s_magic = OCFS2_SUPER_MAGIC;
576 
577 	/* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
578 	 * heartbeat=none */
579 	if (bdev_read_only(sb->s_bdev)) {
580 		if (!(sb->s_flags & MS_RDONLY)) {
581 			status = -EACCES;
582 			mlog(ML_ERROR, "Readonly device detected but readonly "
583 			     "mount was not specified.\n");
584 			goto read_super_error;
585 		}
586 
587 		/* You should not be able to start a local heartbeat
588 		 * on a readonly device. */
589 		if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
590 			status = -EROFS;
591 			mlog(ML_ERROR, "Local heartbeat specified on readonly "
592 			     "device.\n");
593 			goto read_super_error;
594 		}
595 
596 		status = ocfs2_check_journals_nolocks(osb);
597 		if (status < 0) {
598 			if (status == -EROFS)
599 				mlog(ML_ERROR, "Recovery required on readonly "
600 				     "file system, but write access is "
601 				     "unavailable.\n");
602 			else
603 				mlog_errno(status);
604 			goto read_super_error;
605 		}
606 
607 		ocfs2_set_ro_flag(osb, 1);
608 
609 		printk(KERN_NOTICE "Readonly device detected. No cluster "
610 		       "services will be utilized for this mount. Recovery "
611 		       "will be skipped.\n");
612 	}
613 
614 	if (!ocfs2_is_hard_readonly(osb)) {
615 		if (sb->s_flags & MS_RDONLY)
616 			ocfs2_set_ro_flag(osb, 0);
617 	}
618 
619 	status = ocfs2_verify_heartbeat(osb);
620 	if (status < 0) {
621 		mlog_errno(status);
622 		goto read_super_error;
623 	}
624 
625 	osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
626 						 ocfs2_debugfs_root);
627 	if (!osb->osb_debug_root) {
628 		status = -EINVAL;
629 		mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
630 		goto read_super_error;
631 	}
632 
633 	status = ocfs2_mount_volume(sb);
634 	if (osb->root_inode)
635 		inode = igrab(osb->root_inode);
636 
637 	if (status < 0)
638 		goto read_super_error;
639 
640 	if (!inode) {
641 		status = -EIO;
642 		mlog_errno(status);
643 		goto read_super_error;
644 	}
645 
646 	root = d_alloc_root(inode);
647 	if (!root) {
648 		status = -ENOMEM;
649 		mlog_errno(status);
650 		goto read_super_error;
651 	}
652 
653 	sb->s_root = root;
654 
655 	ocfs2_complete_mount_recovery(osb);
656 
657 	if (ocfs2_mount_local(osb))
658 		snprintf(nodestr, sizeof(nodestr), "local");
659 	else
660 		snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
661 
662 	printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
663 	       "with %s data mode.\n",
664 	       osb->dev_str, nodestr, osb->slot_num,
665 	       osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
666 	       "ordered");
667 
668 	atomic_set(&osb->vol_state, VOLUME_MOUNTED);
669 	wake_up(&osb->osb_mount_event);
670 
671 	mlog_exit(status);
672 	return status;
673 
674 read_super_error:
675 	if (bh != NULL)
676 		brelse(bh);
677 
678 	if (inode)
679 		iput(inode);
680 
681 	if (osb) {
682 		atomic_set(&osb->vol_state, VOLUME_DISABLED);
683 		wake_up(&osb->osb_mount_event);
684 		ocfs2_dismount_volume(sb, 1);
685 	}
686 
687 	mlog_exit(status);
688 	return status;
689 }
690 
691 static int ocfs2_get_sb(struct file_system_type *fs_type,
692 			int flags,
693 			const char *dev_name,
694 			void *data,
695 			struct vfsmount *mnt)
696 {
697 	return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
698 			   mnt);
699 }
700 
701 static struct file_system_type ocfs2_fs_type = {
702 	.owner          = THIS_MODULE,
703 	.name           = "ocfs2",
704 	.get_sb         = ocfs2_get_sb, /* is this called when we mount
705 					* the fs? */
706 	.kill_sb        = kill_block_super, /* set to the generic one
707 					     * right now, but do we
708 					     * need to change that? */
709 	.fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
710 	.next           = NULL
711 };
712 
713 static int ocfs2_parse_options(struct super_block *sb,
714 			       char *options,
715 			       unsigned long *mount_opt,
716 			       int is_remount)
717 {
718 	int status;
719 	char *p;
720 
721 	mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
722 		   options ? options : "(none)");
723 
724 	*mount_opt = 0;
725 
726 	if (!options) {
727 		status = 1;
728 		goto bail;
729 	}
730 
731 	while ((p = strsep(&options, ",")) != NULL) {
732 		int token, option;
733 		substring_t args[MAX_OPT_ARGS];
734 		struct ocfs2_super * osb = OCFS2_SB(sb);
735 
736 		if (!*p)
737 			continue;
738 
739 		token = match_token(p, tokens, args);
740 		switch (token) {
741 		case Opt_hb_local:
742 			*mount_opt |= OCFS2_MOUNT_HB_LOCAL;
743 			break;
744 		case Opt_hb_none:
745 			*mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
746 			break;
747 		case Opt_barrier:
748 			if (match_int(&args[0], &option)) {
749 				status = 0;
750 				goto bail;
751 			}
752 			if (option)
753 				*mount_opt |= OCFS2_MOUNT_BARRIER;
754 			else
755 				*mount_opt &= ~OCFS2_MOUNT_BARRIER;
756 			break;
757 		case Opt_intr:
758 			*mount_opt &= ~OCFS2_MOUNT_NOINTR;
759 			break;
760 		case Opt_nointr:
761 			*mount_opt |= OCFS2_MOUNT_NOINTR;
762 			break;
763 		case Opt_err_panic:
764 			*mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
765 			break;
766 		case Opt_err_ro:
767 			*mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
768 			break;
769 		case Opt_data_ordered:
770 			*mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
771 			break;
772 		case Opt_data_writeback:
773 			*mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
774 			break;
775 		case Opt_atime_quantum:
776 			if (match_int(&args[0], &option)) {
777 				status = 0;
778 				goto bail;
779 			}
780 			if (option >= 0)
781 				osb->s_atime_quantum = option;
782 			else
783 				osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
784 			break;
785 		default:
786 			mlog(ML_ERROR,
787 			     "Unrecognized mount option \"%s\" "
788 			     "or missing value\n", p);
789 			status = 0;
790 			goto bail;
791 		}
792 	}
793 
794 	status = 1;
795 
796 bail:
797 	mlog_exit(status);
798 	return status;
799 }
800 
801 static int __init ocfs2_init(void)
802 {
803 	int status;
804 
805 	mlog_entry_void();
806 
807 	ocfs2_print_version();
808 
809 	status = init_ocfs2_uptodate_cache();
810 	if (status < 0) {
811 		mlog_errno(status);
812 		goto leave;
813 	}
814 
815 	status = ocfs2_initialize_mem_caches();
816 	if (status < 0) {
817 		mlog_errno(status);
818 		goto leave;
819 	}
820 
821 	ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
822 	if (!ocfs2_wq) {
823 		status = -ENOMEM;
824 		goto leave;
825 	}
826 
827 	ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
828 	if (!ocfs2_debugfs_root) {
829 		status = -EFAULT;
830 		mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
831 	}
832 
833 leave:
834 	if (status < 0) {
835 		ocfs2_free_mem_caches();
836 		exit_ocfs2_uptodate_cache();
837 	}
838 
839 	mlog_exit(status);
840 
841 	if (status >= 0) {
842 		return register_filesystem(&ocfs2_fs_type);
843 	} else
844 		return -1;
845 }
846 
847 static void __exit ocfs2_exit(void)
848 {
849 	mlog_entry_void();
850 
851 	if (ocfs2_wq) {
852 		flush_workqueue(ocfs2_wq);
853 		destroy_workqueue(ocfs2_wq);
854 	}
855 
856 	debugfs_remove(ocfs2_debugfs_root);
857 
858 	ocfs2_free_mem_caches();
859 
860 	unregister_filesystem(&ocfs2_fs_type);
861 
862 	exit_ocfs2_uptodate_cache();
863 
864 	mlog_exit_void();
865 }
866 
867 static void ocfs2_put_super(struct super_block *sb)
868 {
869 	mlog_entry("(0x%p)\n", sb);
870 
871 	ocfs2_sync_blockdev(sb);
872 	ocfs2_dismount_volume(sb, 0);
873 
874 	mlog_exit_void();
875 }
876 
877 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
878 {
879 	struct ocfs2_super *osb;
880 	u32 numbits, freebits;
881 	int status;
882 	struct ocfs2_dinode *bm_lock;
883 	struct buffer_head *bh = NULL;
884 	struct inode *inode = NULL;
885 
886 	mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
887 
888 	osb = OCFS2_SB(dentry->d_sb);
889 
890 	inode = ocfs2_get_system_file_inode(osb,
891 					    GLOBAL_BITMAP_SYSTEM_INODE,
892 					    OCFS2_INVALID_SLOT);
893 	if (!inode) {
894 		mlog(ML_ERROR, "failed to get bitmap inode\n");
895 		status = -EIO;
896 		goto bail;
897 	}
898 
899 	status = ocfs2_meta_lock(inode, &bh, 0);
900 	if (status < 0) {
901 		mlog_errno(status);
902 		goto bail;
903 	}
904 
905 	bm_lock = (struct ocfs2_dinode *) bh->b_data;
906 
907 	numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
908 	freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
909 
910 	buf->f_type = OCFS2_SUPER_MAGIC;
911 	buf->f_bsize = dentry->d_sb->s_blocksize;
912 	buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
913 	buf->f_blocks = ((sector_t) numbits) *
914 			(osb->s_clustersize >> osb->sb->s_blocksize_bits);
915 	buf->f_bfree = ((sector_t) freebits) *
916 		       (osb->s_clustersize >> osb->sb->s_blocksize_bits);
917 	buf->f_bavail = buf->f_bfree;
918 	buf->f_files = numbits;
919 	buf->f_ffree = freebits;
920 
921 	brelse(bh);
922 
923 	ocfs2_meta_unlock(inode, 0);
924 	status = 0;
925 bail:
926 	if (inode)
927 		iput(inode);
928 
929 	mlog_exit(status);
930 
931 	return status;
932 }
933 
934 static void ocfs2_inode_init_once(void *data,
935 				  struct kmem_cache *cachep,
936 				  unsigned long flags)
937 {
938 	struct ocfs2_inode_info *oi = data;
939 
940 	if (flags & SLAB_CTOR_CONSTRUCTOR) {
941 		oi->ip_flags = 0;
942 		oi->ip_open_count = 0;
943 		spin_lock_init(&oi->ip_lock);
944 		ocfs2_extent_map_init(&oi->vfs_inode);
945 		INIT_LIST_HEAD(&oi->ip_io_markers);
946 		oi->ip_created_trans = 0;
947 		oi->ip_last_trans = 0;
948 		oi->ip_dir_start_lookup = 0;
949 
950 		init_rwsem(&oi->ip_alloc_sem);
951 		mutex_init(&oi->ip_io_mutex);
952 
953 		oi->ip_blkno = 0ULL;
954 		oi->ip_clusters = 0;
955 
956 		ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
957 		ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
958 		ocfs2_lock_res_init_once(&oi->ip_data_lockres);
959 		ocfs2_lock_res_init_once(&oi->ip_open_lockres);
960 
961 		ocfs2_metadata_cache_init(&oi->vfs_inode);
962 
963 		inode_init_once(&oi->vfs_inode);
964 	}
965 }
966 
967 static int ocfs2_initialize_mem_caches(void)
968 {
969 	ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
970 				       sizeof(struct ocfs2_inode_info),
971 				       0,
972 				       (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
973 						SLAB_MEM_SPREAD),
974 				       ocfs2_inode_init_once, NULL);
975 	if (!ocfs2_inode_cachep)
976 		return -ENOMEM;
977 
978 	return 0;
979 }
980 
981 static void ocfs2_free_mem_caches(void)
982 {
983 	if (ocfs2_inode_cachep)
984 		kmem_cache_destroy(ocfs2_inode_cachep);
985 
986 	ocfs2_inode_cachep = NULL;
987 }
988 
989 static int ocfs2_get_sector(struct super_block *sb,
990 			    struct buffer_head **bh,
991 			    int block,
992 			    int sect_size)
993 {
994 	if (!sb_set_blocksize(sb, sect_size)) {
995 		mlog(ML_ERROR, "unable to set blocksize\n");
996 		return -EIO;
997 	}
998 
999 	*bh = sb_getblk(sb, block);
1000 	if (!*bh) {
1001 		mlog_errno(-EIO);
1002 		return -EIO;
1003 	}
1004 	lock_buffer(*bh);
1005 	if (!buffer_dirty(*bh))
1006 		clear_buffer_uptodate(*bh);
1007 	unlock_buffer(*bh);
1008 	ll_rw_block(READ, 1, bh);
1009 	wait_on_buffer(*bh);
1010 	return 0;
1011 }
1012 
1013 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1014 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1015 {
1016 	int status;
1017 
1018 	/* XXX hold a ref on the node while mounte?  easy enough, if
1019 	 * desirable. */
1020 	if (ocfs2_mount_local(osb))
1021 		osb->node_num = 0;
1022 	else
1023 		osb->node_num = o2nm_this_node();
1024 
1025 	if (osb->node_num == O2NM_MAX_NODES) {
1026 		mlog(ML_ERROR, "could not find this host's node number\n");
1027 		status = -ENOENT;
1028 		goto bail;
1029 	}
1030 
1031 	mlog(0, "I am node %d\n", osb->node_num);
1032 
1033 	status = 0;
1034 bail:
1035 	return status;
1036 }
1037 
1038 static int ocfs2_mount_volume(struct super_block *sb)
1039 {
1040 	int status = 0;
1041 	int unlock_super = 0;
1042 	struct ocfs2_super *osb = OCFS2_SB(sb);
1043 
1044 	mlog_entry_void();
1045 
1046 	if (ocfs2_is_hard_readonly(osb))
1047 		goto leave;
1048 
1049 	status = ocfs2_fill_local_node_info(osb);
1050 	if (status < 0) {
1051 		mlog_errno(status);
1052 		goto leave;
1053 	}
1054 
1055 	status = ocfs2_register_hb_callbacks(osb);
1056 	if (status < 0) {
1057 		mlog_errno(status);
1058 		goto leave;
1059 	}
1060 
1061 	status = ocfs2_dlm_init(osb);
1062 	if (status < 0) {
1063 		mlog_errno(status);
1064 		goto leave;
1065 	}
1066 
1067 	/* requires vote_thread to be running. */
1068 	status = ocfs2_register_net_handlers(osb);
1069 	if (status < 0) {
1070 		mlog_errno(status);
1071 		goto leave;
1072 	}
1073 
1074 	status = ocfs2_super_lock(osb, 1);
1075 	if (status < 0) {
1076 		mlog_errno(status);
1077 		goto leave;
1078 	}
1079 	unlock_super = 1;
1080 
1081 	/* This will load up the node map and add ourselves to it. */
1082 	status = ocfs2_find_slot(osb);
1083 	if (status < 0) {
1084 		mlog_errno(status);
1085 		goto leave;
1086 	}
1087 
1088 	ocfs2_populate_mounted_map(osb);
1089 
1090 	/* load all node-local system inodes */
1091 	status = ocfs2_init_local_system_inodes(osb);
1092 	if (status < 0) {
1093 		mlog_errno(status);
1094 		goto leave;
1095 	}
1096 
1097 	status = ocfs2_check_volume(osb);
1098 	if (status < 0) {
1099 		mlog_errno(status);
1100 		goto leave;
1101 	}
1102 
1103 	status = ocfs2_truncate_log_init(osb);
1104 	if (status < 0) {
1105 		mlog_errno(status);
1106 		goto leave;
1107 	}
1108 
1109 	if (ocfs2_mount_local(osb))
1110 		goto leave;
1111 
1112 	/* This should be sent *after* we recovered our journal as it
1113 	 * will cause other nodes to unmark us as needing
1114 	 * recovery. However, we need to send it *before* dropping the
1115 	 * super block lock as otherwise their recovery threads might
1116 	 * try to clean us up while we're live! */
1117 	status = ocfs2_request_mount_vote(osb);
1118 	if (status < 0)
1119 		mlog_errno(status);
1120 
1121 leave:
1122 	if (unlock_super)
1123 		ocfs2_super_unlock(osb, 1);
1124 
1125 	mlog_exit(status);
1126 	return status;
1127 }
1128 
1129 /* we can't grab the goofy sem lock from inside wait_event, so we use
1130  * memory barriers to make sure that we'll see the null task before
1131  * being woken up */
1132 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1133 {
1134 	mb();
1135 	return osb->recovery_thread_task != NULL;
1136 }
1137 
1138 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1139 {
1140 	int tmp;
1141 	struct ocfs2_super *osb = NULL;
1142 	char nodestr[8];
1143 
1144 	mlog_entry("(0x%p)\n", sb);
1145 
1146 	BUG_ON(!sb);
1147 	osb = OCFS2_SB(sb);
1148 	BUG_ON(!osb);
1149 
1150 	ocfs2_shutdown_local_alloc(osb);
1151 
1152 	ocfs2_truncate_log_shutdown(osb);
1153 
1154 	/* disable any new recovery threads and wait for any currently
1155 	 * running ones to exit. Do this before setting the vol_state. */
1156 	mutex_lock(&osb->recovery_lock);
1157 	osb->disable_recovery = 1;
1158 	mutex_unlock(&osb->recovery_lock);
1159 	wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1160 
1161 	/* At this point, we know that no more recovery threads can be
1162 	 * launched, so wait for any recovery completion work to
1163 	 * complete. */
1164 	flush_workqueue(ocfs2_wq);
1165 
1166 	ocfs2_journal_shutdown(osb);
1167 
1168 	ocfs2_sync_blockdev(sb);
1169 
1170 	/* No dlm means we've failed during mount, so skip all the
1171 	 * steps which depended on that to complete. */
1172 	if (osb->dlm) {
1173 		tmp = ocfs2_super_lock(osb, 1);
1174 		if (tmp < 0) {
1175 			mlog_errno(tmp);
1176 			return;
1177 		}
1178 
1179 		tmp = ocfs2_request_umount_vote(osb);
1180 		if (tmp < 0)
1181 			mlog_errno(tmp);
1182 
1183 		if (osb->slot_num != OCFS2_INVALID_SLOT)
1184 			ocfs2_put_slot(osb);
1185 
1186 		ocfs2_super_unlock(osb, 1);
1187 	}
1188 
1189 	ocfs2_release_system_inodes(osb);
1190 
1191 	if (osb->dlm) {
1192 		ocfs2_unregister_net_handlers(osb);
1193 
1194 		ocfs2_dlm_shutdown(osb);
1195 	}
1196 
1197 	ocfs2_clear_hb_callbacks(osb);
1198 
1199 	debugfs_remove(osb->osb_debug_root);
1200 
1201 	if (!mnt_err)
1202 		ocfs2_stop_heartbeat(osb);
1203 
1204 	atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1205 
1206 	if (ocfs2_mount_local(osb))
1207 		snprintf(nodestr, sizeof(nodestr), "local");
1208 	else
1209 		snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1210 
1211 	printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1212 	       osb->dev_str, nodestr);
1213 
1214 	ocfs2_delete_osb(osb);
1215 	kfree(osb);
1216 	sb->s_dev = 0;
1217 	sb->s_fs_info = NULL;
1218 }
1219 
1220 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1221 				unsigned uuid_bytes)
1222 {
1223 	int i, ret;
1224 	char *ptr;
1225 
1226 	BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1227 
1228 	osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1229 	if (osb->uuid_str == NULL)
1230 		return -ENOMEM;
1231 
1232 	for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1233 		/* print with null */
1234 		ret = snprintf(ptr, 3, "%02X", uuid[i]);
1235 		if (ret != 2) /* drop super cleans up */
1236 			return -EINVAL;
1237 		/* then only advance past the last char */
1238 		ptr += 2;
1239 	}
1240 
1241 	return 0;
1242 }
1243 
1244 static int ocfs2_initialize_super(struct super_block *sb,
1245 				  struct buffer_head *bh,
1246 				  int sector_size)
1247 {
1248 	int status = 0;
1249 	int i;
1250 	struct ocfs2_dinode *di = NULL;
1251 	struct inode *inode = NULL;
1252 	struct buffer_head *bitmap_bh = NULL;
1253 	struct ocfs2_journal *journal;
1254 	__le32 uuid_net_key;
1255 	struct ocfs2_super *osb;
1256 
1257 	mlog_entry_void();
1258 
1259 	osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1260 	if (!osb) {
1261 		status = -ENOMEM;
1262 		mlog_errno(status);
1263 		goto bail;
1264 	}
1265 
1266 	sb->s_fs_info = osb;
1267 	sb->s_op = &ocfs2_sops;
1268 	sb->s_export_op = &ocfs2_export_ops;
1269 	sb->s_flags |= MS_NOATIME;
1270 	/* this is needed to support O_LARGEFILE */
1271 	sb->s_maxbytes = ocfs2_max_file_offset(sb->s_blocksize_bits);
1272 
1273 	osb->sb = sb;
1274 	/* Save off for ocfs2_rw_direct */
1275 	osb->s_sectsize_bits = blksize_bits(sector_size);
1276 	BUG_ON(!osb->s_sectsize_bits);
1277 
1278 	osb->net_response_ids = 0;
1279 	spin_lock_init(&osb->net_response_lock);
1280 	INIT_LIST_HEAD(&osb->net_response_list);
1281 
1282 	INIT_LIST_HEAD(&osb->osb_net_handlers);
1283 	init_waitqueue_head(&osb->recovery_event);
1284 	spin_lock_init(&osb->vote_task_lock);
1285 	init_waitqueue_head(&osb->vote_event);
1286 	osb->vote_work_sequence = 0;
1287 	osb->vote_wake_sequence = 0;
1288 	INIT_LIST_HEAD(&osb->blocked_lock_list);
1289 	osb->blocked_lock_count = 0;
1290 	INIT_LIST_HEAD(&osb->vote_list);
1291 	spin_lock_init(&osb->osb_lock);
1292 
1293 	atomic_set(&osb->alloc_stats.moves, 0);
1294 	atomic_set(&osb->alloc_stats.local_data, 0);
1295 	atomic_set(&osb->alloc_stats.bitmap_data, 0);
1296 	atomic_set(&osb->alloc_stats.bg_allocs, 0);
1297 	atomic_set(&osb->alloc_stats.bg_extends, 0);
1298 
1299 	ocfs2_init_node_maps(osb);
1300 
1301 	snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1302 		 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1303 
1304 	mutex_init(&osb->recovery_lock);
1305 
1306 	osb->disable_recovery = 0;
1307 	osb->recovery_thread_task = NULL;
1308 
1309 	init_waitqueue_head(&osb->checkpoint_event);
1310 	atomic_set(&osb->needs_checkpoint, 0);
1311 
1312 	osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1313 
1314 	osb->node_num = O2NM_INVALID_NODE_NUM;
1315 	osb->slot_num = OCFS2_INVALID_SLOT;
1316 
1317 	osb->local_alloc_state = OCFS2_LA_UNUSED;
1318 	osb->local_alloc_bh = NULL;
1319 
1320 	ocfs2_setup_hb_callbacks(osb);
1321 
1322 	init_waitqueue_head(&osb->osb_mount_event);
1323 
1324 	osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1325 	if (!osb->vol_label) {
1326 		mlog(ML_ERROR, "unable to alloc vol label\n");
1327 		status = -ENOMEM;
1328 		goto bail;
1329 	}
1330 
1331 	di = (struct ocfs2_dinode *)bh->b_data;
1332 
1333 	osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1334 	if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1335 		mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1336 		     osb->max_slots);
1337 		status = -EINVAL;
1338 		goto bail;
1339 	}
1340 	mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1341 
1342 	init_waitqueue_head(&osb->osb_wipe_event);
1343 	osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1344 					sizeof(*osb->osb_orphan_wipes),
1345 					GFP_KERNEL);
1346 	if (!osb->osb_orphan_wipes) {
1347 		status = -ENOMEM;
1348 		mlog_errno(status);
1349 		goto bail;
1350 	}
1351 
1352 	osb->s_feature_compat =
1353 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1354 	osb->s_feature_ro_compat =
1355 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1356 	osb->s_feature_incompat =
1357 		le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1358 
1359 	if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1360 		mlog(ML_ERROR, "couldn't mount because of unsupported "
1361 		     "optional features (%x).\n", i);
1362 		status = -EINVAL;
1363 		goto bail;
1364 	}
1365 	if (!(osb->sb->s_flags & MS_RDONLY) &&
1366 	    (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1367 		mlog(ML_ERROR, "couldn't mount RDWR because of "
1368 		     "unsupported optional features (%x).\n", i);
1369 		status = -EINVAL;
1370 		goto bail;
1371 	}
1372 
1373 	get_random_bytes(&osb->s_next_generation, sizeof(u32));
1374 
1375 	/* FIXME
1376 	 * This should be done in ocfs2_journal_init(), but unknown
1377 	 * ordering issues will cause the filesystem to crash.
1378 	 * If anyone wants to figure out what part of the code
1379 	 * refers to osb->journal before ocfs2_journal_init() is run,
1380 	 * be my guest.
1381 	 */
1382 	/* initialize our journal structure */
1383 
1384 	journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1385 	if (!journal) {
1386 		mlog(ML_ERROR, "unable to alloc journal\n");
1387 		status = -ENOMEM;
1388 		goto bail;
1389 	}
1390 	osb->journal = journal;
1391 	journal->j_osb = osb;
1392 
1393 	atomic_set(&journal->j_num_trans, 0);
1394 	init_rwsem(&journal->j_trans_barrier);
1395 	init_waitqueue_head(&journal->j_checkpointed);
1396 	spin_lock_init(&journal->j_lock);
1397 	journal->j_trans_id = (unsigned long) 1;
1398 	INIT_LIST_HEAD(&journal->j_la_cleanups);
1399 	INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1400 	journal->j_state = OCFS2_JOURNAL_FREE;
1401 
1402 	/* get some pseudo constants for clustersize bits */
1403 	osb->s_clustersize_bits =
1404 		le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1405 	osb->s_clustersize = 1 << osb->s_clustersize_bits;
1406 	mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1407 
1408 	if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1409 	    osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1410 		mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1411 		     osb->s_clustersize);
1412 		status = -EINVAL;
1413 		goto bail;
1414 	}
1415 
1416 	if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1417 	    > (u32)~0UL) {
1418 		mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1419 		     "what jbd can address in 32 bits.\n");
1420 		status = -EINVAL;
1421 		goto bail;
1422 	}
1423 
1424 	if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1425 				 sizeof(di->id2.i_super.s_uuid))) {
1426 		mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1427 		status = -ENOMEM;
1428 		goto bail;
1429 	}
1430 
1431 	memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1432 	osb->net_key = le32_to_cpu(uuid_net_key);
1433 
1434 	strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1435 	osb->vol_label[63] = '\0';
1436 	osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1437 	osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1438 	osb->first_cluster_group_blkno =
1439 		le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1440 	osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1441 	mlog(0, "vol_label: %s\n", osb->vol_label);
1442 	mlog(0, "uuid: %s\n", osb->uuid_str);
1443 	mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1444 	     (unsigned long long)osb->root_blkno,
1445 	     (unsigned long long)osb->system_dir_blkno);
1446 
1447 	osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1448 	if (!osb->osb_dlm_debug) {
1449 		status = -ENOMEM;
1450 		mlog_errno(status);
1451 		goto bail;
1452 	}
1453 
1454 	atomic_set(&osb->vol_state, VOLUME_INIT);
1455 
1456 	/* load root, system_dir, and all global system inodes */
1457 	status = ocfs2_init_global_system_inodes(osb);
1458 	if (status < 0) {
1459 		mlog_errno(status);
1460 		goto bail;
1461 	}
1462 
1463 	/*
1464 	 * global bitmap
1465 	 */
1466 	inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1467 					    OCFS2_INVALID_SLOT);
1468 	if (!inode) {
1469 		status = -EINVAL;
1470 		mlog_errno(status);
1471 		goto bail;
1472 	}
1473 
1474 	osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1475 
1476 	/* We don't have a cluster lock on the bitmap here because
1477 	 * we're only interested in static information and the extra
1478 	 * complexity at mount time isn't worht it. Don't pass the
1479 	 * inode in to the read function though as we don't want it to
1480 	 * be put in the cache. */
1481 	status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1482 				  NULL);
1483 	iput(inode);
1484 	if (status < 0) {
1485 		mlog_errno(status);
1486 		goto bail;
1487 	}
1488 
1489 	di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1490 	osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1491 	brelse(bitmap_bh);
1492 	mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1493 	     (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1494 
1495 	status = ocfs2_init_slot_info(osb);
1496 	if (status < 0) {
1497 		mlog_errno(status);
1498 		goto bail;
1499 	}
1500 
1501 bail:
1502 	mlog_exit(status);
1503 	return status;
1504 }
1505 
1506 /*
1507  * will return: -EAGAIN if it is ok to keep searching for superblocks
1508  *              -EINVAL if there is a bad superblock
1509  *              0 on success
1510  */
1511 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1512 			       struct buffer_head *bh,
1513 			       u32 blksz)
1514 {
1515 	int status = -EAGAIN;
1516 
1517 	mlog_entry_void();
1518 
1519 	if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1520 		   strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1521 		status = -EINVAL;
1522 		if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1523 			mlog(ML_ERROR, "found superblock with incorrect block "
1524 			     "size: found %u, should be %u\n",
1525 			     1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1526 			       blksz);
1527 		} else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1528 			   OCFS2_MAJOR_REV_LEVEL ||
1529 			   le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1530 			   OCFS2_MINOR_REV_LEVEL) {
1531 			mlog(ML_ERROR, "found superblock with bad version: "
1532 			     "found %u.%u, should be %u.%u\n",
1533 			     le16_to_cpu(di->id2.i_super.s_major_rev_level),
1534 			     le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1535 			     OCFS2_MAJOR_REV_LEVEL,
1536 			     OCFS2_MINOR_REV_LEVEL);
1537 		} else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1538 			mlog(ML_ERROR, "bad block number on superblock: "
1539 			     "found %llu, should be %llu\n",
1540 			     (unsigned long long)le64_to_cpu(di->i_blkno),
1541 			     (unsigned long long)bh->b_blocknr);
1542 		} else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1543 			    le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1544 			mlog(ML_ERROR, "bad cluster size found: %u\n",
1545 			     1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1546 		} else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1547 			mlog(ML_ERROR, "bad root_blkno: 0\n");
1548 		} else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1549 			mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1550 		} else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1551 			mlog(ML_ERROR,
1552 			     "Superblock slots found greater than file system "
1553 			     "maximum: found %u, max %u\n",
1554 			     le16_to_cpu(di->id2.i_super.s_max_slots),
1555 			     OCFS2_MAX_SLOTS);
1556 		} else {
1557 			/* found it! */
1558 			status = 0;
1559 		}
1560 	}
1561 
1562 	mlog_exit(status);
1563 	return status;
1564 }
1565 
1566 static int ocfs2_check_volume(struct ocfs2_super *osb)
1567 {
1568 	int status = 0;
1569 	int dirty;
1570 	int local;
1571 	struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1572 						  * recover
1573 						  * ourselves. */
1574 
1575 	mlog_entry_void();
1576 
1577 	/* Init our journal object. */
1578 	status = ocfs2_journal_init(osb->journal, &dirty);
1579 	if (status < 0) {
1580 		mlog(ML_ERROR, "Could not initialize journal!\n");
1581 		goto finally;
1582 	}
1583 
1584 	/* If the journal was unmounted cleanly then we don't want to
1585 	 * recover anything. Otherwise, journal_load will do that
1586 	 * dirty work for us :) */
1587 	if (!dirty) {
1588 		status = ocfs2_journal_wipe(osb->journal, 0);
1589 		if (status < 0) {
1590 			mlog_errno(status);
1591 			goto finally;
1592 		}
1593 	} else {
1594 		mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1595 		     "recovering volume.\n");
1596 	}
1597 
1598 	local = ocfs2_mount_local(osb);
1599 
1600 	/* will play back anything left in the journal. */
1601 	ocfs2_journal_load(osb->journal, local);
1602 
1603 	if (dirty) {
1604 		/* recover my local alloc if we didn't unmount cleanly. */
1605 		status = ocfs2_begin_local_alloc_recovery(osb,
1606 							  osb->slot_num,
1607 							  &local_alloc);
1608 		if (status < 0) {
1609 			mlog_errno(status);
1610 			goto finally;
1611 		}
1612 		/* we complete the recovery process after we've marked
1613 		 * ourselves as mounted. */
1614 	}
1615 
1616 	mlog(0, "Journal loaded.\n");
1617 
1618 	status = ocfs2_load_local_alloc(osb);
1619 	if (status < 0) {
1620 		mlog_errno(status);
1621 		goto finally;
1622 	}
1623 
1624 	if (dirty) {
1625 		/* Recovery will be completed after we've mounted the
1626 		 * rest of the volume. */
1627 		osb->dirty = 1;
1628 		osb->local_alloc_copy = local_alloc;
1629 		local_alloc = NULL;
1630 	}
1631 
1632 	/* go through each journal, trylock it and if you get the
1633 	 * lock, and it's marked as dirty, set the bit in the recover
1634 	 * map and launch a recovery thread for it. */
1635 	status = ocfs2_mark_dead_nodes(osb);
1636 	if (status < 0)
1637 		mlog_errno(status);
1638 
1639 finally:
1640 	if (local_alloc)
1641 		kfree(local_alloc);
1642 
1643 	mlog_exit(status);
1644 	return status;
1645 }
1646 
1647 /*
1648  * The routine gets called from dismount or close whenever a dismount on
1649  * volume is requested and the osb open count becomes 1.
1650  * It will remove the osb from the global list and also free up all the
1651  * initialized resources and fileobject.
1652  */
1653 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1654 {
1655 	mlog_entry_void();
1656 
1657 	/* This function assumes that the caller has the main osb resource */
1658 
1659 	if (osb->slot_info)
1660 		ocfs2_free_slot_info(osb->slot_info);
1661 
1662 	kfree(osb->osb_orphan_wipes);
1663 	/* FIXME
1664 	 * This belongs in journal shutdown, but because we have to
1665 	 * allocate osb->journal at the start of ocfs2_initalize_osb(),
1666 	 * we free it here.
1667 	 */
1668 	kfree(osb->journal);
1669 	if (osb->local_alloc_copy)
1670 		kfree(osb->local_alloc_copy);
1671 	kfree(osb->uuid_str);
1672 	ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1673 	memset(osb, 0, sizeof(struct ocfs2_super));
1674 
1675 	mlog_exit_void();
1676 }
1677 
1678 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1679  * panic(). We do not support continue-on-error operation. */
1680 static void ocfs2_handle_error(struct super_block *sb)
1681 {
1682 	struct ocfs2_super *osb = OCFS2_SB(sb);
1683 
1684 	if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1685 		panic("OCFS2: (device %s): panic forced after error\n",
1686 		      sb->s_id);
1687 
1688 	ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1689 
1690 	if (sb->s_flags & MS_RDONLY &&
1691 	    (ocfs2_is_soft_readonly(osb) ||
1692 	     ocfs2_is_hard_readonly(osb)))
1693 		return;
1694 
1695 	printk(KERN_CRIT "File system is now read-only due to the potential "
1696 	       "of on-disk corruption. Please run fsck.ocfs2 once the file "
1697 	       "system is unmounted.\n");
1698 	sb->s_flags |= MS_RDONLY;
1699 	ocfs2_set_ro_flag(osb, 0);
1700 }
1701 
1702 static char error_buf[1024];
1703 
1704 void __ocfs2_error(struct super_block *sb,
1705 		   const char *function,
1706 		   const char *fmt, ...)
1707 {
1708 	va_list args;
1709 
1710 	va_start(args, fmt);
1711 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1712 	va_end(args);
1713 
1714 	/* Not using mlog here because we want to show the actual
1715 	 * function the error came from. */
1716 	printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1717 	       sb->s_id, function, error_buf);
1718 
1719 	ocfs2_handle_error(sb);
1720 }
1721 
1722 /* Handle critical errors. This is intentionally more drastic than
1723  * ocfs2_handle_error, so we only use for things like journal errors,
1724  * etc. */
1725 void __ocfs2_abort(struct super_block* sb,
1726 		   const char *function,
1727 		   const char *fmt, ...)
1728 {
1729 	va_list args;
1730 
1731 	va_start(args, fmt);
1732 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1733 	va_end(args);
1734 
1735 	printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1736 	       sb->s_id, function, error_buf);
1737 
1738 	/* We don't have the cluster support yet to go straight to
1739 	 * hard readonly in here. Until then, we want to keep
1740 	 * ocfs2_abort() so that we can at least mark critical
1741 	 * errors.
1742 	 *
1743 	 * TODO: This should abort the journal and alert other nodes
1744 	 * that our slot needs recovery. */
1745 
1746 	/* Force a panic(). This stinks, but it's better than letting
1747 	 * things continue without having a proper hard readonly
1748 	 * here. */
1749 	OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1750 	ocfs2_handle_error(sb);
1751 }
1752 
1753 module_init(ocfs2_init);
1754 module_exit(ocfs2_exit);
1755