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Linux 2.6.28.1
[linux/fpc-iii.git] / fs / ocfs2 / super.c
blob304b63ac78cfcceeef4759c66c5f72952477909d
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 #include <linux/seq_file.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 "xattr.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 char cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
92 };
93
94 static int ocfs2_parse_options(struct super_block *sb, char *options,
95 struct mount_options *mopt,
96 int is_remount);
97 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
98 static void ocfs2_put_super(struct super_block *sb);
99 static int ocfs2_mount_volume(struct super_block *sb);
100 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
101 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
102 static int ocfs2_initialize_mem_caches(void);
103 static void ocfs2_free_mem_caches(void);
104 static void ocfs2_delete_osb(struct ocfs2_super *osb);
105
106 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
107
108 static int ocfs2_sync_fs(struct super_block *sb, int wait);
109
110 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
111 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
112 static void ocfs2_release_system_inodes(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_stack,
158 Opt_user_xattr,
159 Opt_nouser_xattr,
160 Opt_inode64,
161 Opt_err,
162 };
163
164 static const match_table_t tokens = {
165 {Opt_barrier, "barrier=%u"},
166 {Opt_err_panic, "errors=panic"},
167 {Opt_err_ro, "errors=remount-ro"},
168 {Opt_intr, "intr"},
169 {Opt_nointr, "nointr"},
170 {Opt_hb_none, OCFS2_HB_NONE},
171 {Opt_hb_local, OCFS2_HB_LOCAL},
172 {Opt_data_ordered, "data=ordered"},
173 {Opt_data_writeback, "data=writeback"},
174 {Opt_atime_quantum, "atime_quantum=%u"},
175 {Opt_slot, "preferred_slot=%u"},
176 {Opt_commit, "commit=%u"},
177 {Opt_localalloc, "localalloc=%d"},
178 {Opt_localflocks, "localflocks"},
179 {Opt_stack, "cluster_stack=%s"},
180 {Opt_user_xattr, "user_xattr"},
181 {Opt_nouser_xattr, "nouser_xattr"},
182 {Opt_inode64, "inode64"},
183 {Opt_err, NULL}
184 };
185
186 /*
187 * write_super and sync_fs ripped right out of ext3.
188 */
189 static void ocfs2_write_super(struct super_block *sb)
190 {
191 if (mutex_trylock(&sb->s_lock) != 0)
192 BUG();
193 sb->s_dirt = 0;
194 }
195
196 static int ocfs2_sync_fs(struct super_block *sb, int wait)
197 {
198 int status;
199 tid_t target;
200 struct ocfs2_super *osb = OCFS2_SB(sb);
201
202 sb->s_dirt = 0;
203
204 if (ocfs2_is_hard_readonly(osb))
205 return -EROFS;
206
207 if (wait) {
208 status = ocfs2_flush_truncate_log(osb);
209 if (status < 0)
210 mlog_errno(status);
211 } else {
212 ocfs2_schedule_truncate_log_flush(osb, 0);
213 }
214
215 if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
216 &target)) {
217 if (wait)
218 jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
219 target);
220 }
221 return 0;
222 }
223
224 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
225 {
226 struct inode *new = NULL;
227 int status = 0;
228 int i;
229
230 mlog_entry_void();
231
232 new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
233 if (IS_ERR(new)) {
234 status = PTR_ERR(new);
235 mlog_errno(status);
236 goto bail;
237 }
238 osb->root_inode = new;
239
240 new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
241 if (IS_ERR(new)) {
242 status = PTR_ERR(new);
243 mlog_errno(status);
244 goto bail;
245 }
246 osb->sys_root_inode = new;
247
248 for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
249 i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
250 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
251 if (!new) {
252 ocfs2_release_system_inodes(osb);
253 status = -EINVAL;
254 mlog_errno(status);
255 /* FIXME: Should ERROR_RO_FS */
256 mlog(ML_ERROR, "Unable to load system inode %d, "
257 "possibly corrupt fs?", i);
258 goto bail;
259 }
260 // the array now has one ref, so drop this one
261 iput(new);
262 }
263
264 bail:
265 mlog_exit(status);
266 return status;
267 }
268
269 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
270 {
271 struct inode *new = NULL;
272 int status = 0;
273 int i;
274
275 mlog_entry_void();
276
277 for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
278 i < NUM_SYSTEM_INODES;
279 i++) {
280 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
281 if (!new) {
282 ocfs2_release_system_inodes(osb);
283 status = -EINVAL;
284 mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
285 status, i, osb->slot_num);
286 goto bail;
287 }
288 /* the array now has one ref, so drop this one */
289 iput(new);
290 }
291
292 bail:
293 mlog_exit(status);
294 return status;
295 }
296
297 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
298 {
299 int i;
300 struct inode *inode;
301
302 mlog_entry_void();
303
304 for (i = 0; i < NUM_SYSTEM_INODES; i++) {
305 inode = osb->system_inodes[i];
306 if (inode) {
307 iput(inode);
308 osb->system_inodes[i] = NULL;
309 }
310 }
311
312 inode = osb->sys_root_inode;
313 if (inode) {
314 iput(inode);
315 osb->sys_root_inode = NULL;
316 }
317
318 inode = osb->root_inode;
319 if (inode) {
320 iput(inode);
321 osb->root_inode = NULL;
322 }
323
324 mlog_exit(0);
325 }
326
327 /* We're allocating fs objects, use GFP_NOFS */
328 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
329 {
330 struct ocfs2_inode_info *oi;
331
332 oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
333 if (!oi)
334 return NULL;
335
336 jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
337 return &oi->vfs_inode;
338 }
339
340 static void ocfs2_destroy_inode(struct inode *inode)
341 {
342 kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
343 }
344
345 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
346 unsigned int cbits)
347 {
348 unsigned int bytes = 1 << cbits;
349 unsigned int trim = bytes;
350 unsigned int bitshift = 32;
351
352 /*
353 * i_size and all block offsets in ocfs2 are always 64 bits
354 * wide. i_clusters is 32 bits, in cluster-sized units. So on
355 * 64 bit platforms, cluster size will be the limiting factor.
356 */
357
358 #if BITS_PER_LONG == 32
359 # if defined(CONFIG_LBD)
360 BUILD_BUG_ON(sizeof(sector_t) != 8);
361 /*
362 * We might be limited by page cache size.
363 */
364 if (bytes > PAGE_CACHE_SIZE) {
365 bytes = PAGE_CACHE_SIZE;
366 trim = 1;
367 /*
368 * Shift by 31 here so that we don't get larger than
369 * MAX_LFS_FILESIZE
370 */
371 bitshift = 31;
372 }
373 # else
374 /*
375 * We are limited by the size of sector_t. Use block size, as
376 * that's what we expose to the VFS.
377 */
378 bytes = 1 << bbits;
379 trim = 1;
380 bitshift = 31;
381 # endif
382 #endif
383
384 /*
385 * Trim by a whole cluster when we can actually approach the
386 * on-disk limits. Otherwise we can overflow i_clusters when
387 * an extent start is at the max offset.
388 */
389 return (((unsigned long long)bytes) << bitshift) - trim;
390 }
391
392 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
393 {
394 int incompat_features;
395 int ret = 0;
396 struct mount_options parsed_options;
397 struct ocfs2_super *osb = OCFS2_SB(sb);
398
399 if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
400 ret = -EINVAL;
401 goto out;
402 }
403
404 if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
405 (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
406 ret = -EINVAL;
407 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
408 goto out;
409 }
410
411 if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
412 (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
413 ret = -EINVAL;
414 mlog(ML_ERROR, "Cannot change data mode on remount\n");
415 goto out;
416 }
417
418 /* Probably don't want this on remount; it might
419 * mess with other nodes */
420 if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
421 (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
422 ret = -EINVAL;
423 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
424 goto out;
425 }
426
427 /* We're going to/from readonly mode. */
428 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
429 /* Lock here so the check of HARD_RO and the potential
430 * setting of SOFT_RO is atomic. */
431 spin_lock(&osb->osb_lock);
432 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
433 mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
434 ret = -EROFS;
435 goto unlock_osb;
436 }
437
438 if (*flags & MS_RDONLY) {
439 mlog(0, "Going to ro mode.\n");
440 sb->s_flags |= MS_RDONLY;
441 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
442 } else {
443 mlog(0, "Making ro filesystem writeable.\n");
444
445 if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
446 mlog(ML_ERROR, "Cannot remount RDWR "
447 "filesystem due to previous errors.\n");
448 ret = -EROFS;
449 goto unlock_osb;
450 }
451 incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
452 if (incompat_features) {
453 mlog(ML_ERROR, "Cannot remount RDWR because "
454 "of unsupported optional features "
455 "(%x).\n", incompat_features);
456 ret = -EINVAL;
457 goto unlock_osb;
458 }
459 sb->s_flags &= ~MS_RDONLY;
460 osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
461 }
462 unlock_osb:
463 spin_unlock(&osb->osb_lock);
464 }
465
466 if (!ret) {
467 /* Only save off the new mount options in case of a successful
468 * remount. */
469 osb->s_mount_opt = parsed_options.mount_opt;
470 osb->s_atime_quantum = parsed_options.atime_quantum;
471 osb->preferred_slot = parsed_options.slot;
472 if (parsed_options.commit_interval)
473 osb->osb_commit_interval = parsed_options.commit_interval;
474
475 if (!ocfs2_is_hard_readonly(osb))
476 ocfs2_set_journal_params(osb);
477 }
478 out:
479 return ret;
480 }
481
482 static int ocfs2_sb_probe(struct super_block *sb,
483 struct buffer_head **bh,
484 int *sector_size)
485 {
486 int status, tmpstat;
487 struct ocfs1_vol_disk_hdr *hdr;
488 struct ocfs2_dinode *di;
489 int blksize;
490
491 *bh = NULL;
492
493 /* may be > 512 */
494 *sector_size = bdev_hardsect_size(sb->s_bdev);
495 if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
496 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
497 *sector_size, OCFS2_MAX_BLOCKSIZE);
498 status = -EINVAL;
499 goto bail;
500 }
501
502 /* Can this really happen? */
503 if (*sector_size < OCFS2_MIN_BLOCKSIZE)
504 *sector_size = OCFS2_MIN_BLOCKSIZE;
505
506 /* check block zero for old format */
507 status = ocfs2_get_sector(sb, bh, 0, *sector_size);
508 if (status < 0) {
509 mlog_errno(status);
510 goto bail;
511 }
512 hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
513 if (hdr->major_version == OCFS1_MAJOR_VERSION) {
514 mlog(ML_ERROR, "incompatible version: %u.%u\n",
515 hdr->major_version, hdr->minor_version);
516 status = -EINVAL;
517 }
518 if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
519 strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
520 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
521 hdr->signature);
522 status = -EINVAL;
523 }
524 brelse(*bh);
525 *bh = NULL;
526 if (status < 0) {
527 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
528 "upgraded before mounting with ocfs v2\n");
529 goto bail;
530 }
531
532 /*
533 * Now check at magic offset for 512, 1024, 2048, 4096
534 * blocksizes. 4096 is the maximum blocksize because it is
535 * the minimum clustersize.
536 */
537 status = -EINVAL;
538 for (blksize = *sector_size;
539 blksize <= OCFS2_MAX_BLOCKSIZE;
540 blksize <<= 1) {
541 tmpstat = ocfs2_get_sector(sb, bh,
542 OCFS2_SUPER_BLOCK_BLKNO,
543 blksize);
544 if (tmpstat < 0) {
545 status = tmpstat;
546 mlog_errno(status);
547 goto bail;
548 }
549 di = (struct ocfs2_dinode *) (*bh)->b_data;
550 status = ocfs2_verify_volume(di, *bh, blksize);
551 if (status >= 0)
552 goto bail;
553 brelse(*bh);
554 *bh = NULL;
555 if (status != -EAGAIN)
556 break;
557 }
558
559 bail:
560 return status;
561 }
562
563 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
564 {
565 if (ocfs2_mount_local(osb)) {
566 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
567 mlog(ML_ERROR, "Cannot heartbeat on a locally "
568 "mounted device.\n");
569 return -EINVAL;
570 }
571 }
572
573 if (ocfs2_userspace_stack(osb)) {
574 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
575 mlog(ML_ERROR, "Userspace stack expected, but "
576 "o2cb heartbeat arguments passed to mount\n");
577 return -EINVAL;
578 }
579 }
580
581 if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
582 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
583 !ocfs2_userspace_stack(osb)) {
584 mlog(ML_ERROR, "Heartbeat has to be started to mount "
585 "a read-write clustered device.\n");
586 return -EINVAL;
587 }
588 }
589
590 return 0;
591 }
592
593 /*
594 * If we're using a userspace stack, mount should have passed
595 * a name that matches the disk. If not, mount should not
596 * have passed a stack.
597 */
598 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
599 struct mount_options *mopt)
600 {
601 if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
602 mlog(ML_ERROR,
603 "cluster stack passed to mount, but this filesystem "
604 "does not support it\n");
605 return -EINVAL;
606 }
607
608 if (ocfs2_userspace_stack(osb) &&
609 strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
610 OCFS2_STACK_LABEL_LEN)) {
611 mlog(ML_ERROR,
612 "cluster stack passed to mount (\"%s\") does not "
613 "match the filesystem (\"%s\")\n",
614 mopt->cluster_stack,
615 osb->osb_cluster_stack);
616 return -EINVAL;
617 }
618
619 return 0;
620 }
621
622 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
623 {
624 struct dentry *root;
625 int status, sector_size;
626 struct mount_options parsed_options;
627 struct inode *inode = NULL;
628 struct ocfs2_super *osb = NULL;
629 struct buffer_head *bh = NULL;
630 char nodestr[8];
631
632 mlog_entry("%p, %p, %i", sb, data, silent);
633
634 if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
635 status = -EINVAL;
636 goto read_super_error;
637 }
638
639 /* probe for superblock */
640 status = ocfs2_sb_probe(sb, &bh, &sector_size);
641 if (status < 0) {
642 mlog(ML_ERROR, "superblock probe failed!\n");
643 goto read_super_error;
644 }
645
646 status = ocfs2_initialize_super(sb, bh, sector_size);
647 osb = OCFS2_SB(sb);
648 if (status < 0) {
649 mlog_errno(status);
650 goto read_super_error;
651 }
652 brelse(bh);
653 bh = NULL;
654 osb->s_mount_opt = parsed_options.mount_opt;
655 osb->s_atime_quantum = parsed_options.atime_quantum;
656 osb->preferred_slot = parsed_options.slot;
657 osb->osb_commit_interval = parsed_options.commit_interval;
658 osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
659 osb->local_alloc_bits = osb->local_alloc_default_bits;
660
661 status = ocfs2_verify_userspace_stack(osb, &parsed_options);
662 if (status)
663 goto read_super_error;
664
665 sb->s_magic = OCFS2_SUPER_MAGIC;
666
667 /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
668 * heartbeat=none */
669 if (bdev_read_only(sb->s_bdev)) {
670 if (!(sb->s_flags & MS_RDONLY)) {
671 status = -EACCES;
672 mlog(ML_ERROR, "Readonly device detected but readonly "
673 "mount was not specified.\n");
674 goto read_super_error;
675 }
676
677 /* You should not be able to start a local heartbeat
678 * on a readonly device. */
679 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
680 status = -EROFS;
681 mlog(ML_ERROR, "Local heartbeat specified on readonly "
682 "device.\n");
683 goto read_super_error;
684 }
685
686 status = ocfs2_check_journals_nolocks(osb);
687 if (status < 0) {
688 if (status == -EROFS)
689 mlog(ML_ERROR, "Recovery required on readonly "
690 "file system, but write access is "
691 "unavailable.\n");
692 else
693 mlog_errno(status);
694 goto read_super_error;
695 }
696
697 ocfs2_set_ro_flag(osb, 1);
698
699 printk(KERN_NOTICE "Readonly device detected. No cluster "
700 "services will be utilized for this mount. Recovery "
701 "will be skipped.\n");
702 }
703
704 if (!ocfs2_is_hard_readonly(osb)) {
705 if (sb->s_flags & MS_RDONLY)
706 ocfs2_set_ro_flag(osb, 0);
707 }
708
709 status = ocfs2_verify_heartbeat(osb);
710 if (status < 0) {
711 mlog_errno(status);
712 goto read_super_error;
713 }
714
715 osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
716 ocfs2_debugfs_root);
717 if (!osb->osb_debug_root) {
718 status = -EINVAL;
719 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
720 goto read_super_error;
721 }
722
723 status = ocfs2_mount_volume(sb);
724 if (osb->root_inode)
725 inode = igrab(osb->root_inode);
726
727 if (status < 0)
728 goto read_super_error;
729
730 if (!inode) {
731 status = -EIO;
732 mlog_errno(status);
733 goto read_super_error;
734 }
735
736 root = d_alloc_root(inode);
737 if (!root) {
738 status = -ENOMEM;
739 mlog_errno(status);
740 goto read_super_error;
741 }
742
743 sb->s_root = root;
744
745 ocfs2_complete_mount_recovery(osb);
746
747 if (ocfs2_mount_local(osb))
748 snprintf(nodestr, sizeof(nodestr), "local");
749 else
750 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
751
752 printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
753 "with %s data mode.\n",
754 osb->dev_str, nodestr, osb->slot_num,
755 osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
756 "ordered");
757
758 atomic_set(&osb->vol_state, VOLUME_MOUNTED);
759 wake_up(&osb->osb_mount_event);
760
761 mlog_exit(status);
762 return status;
763
764 read_super_error:
765 brelse(bh);
766
767 if (inode)
768 iput(inode);
769
770 if (osb) {
771 atomic_set(&osb->vol_state, VOLUME_DISABLED);
772 wake_up(&osb->osb_mount_event);
773 ocfs2_dismount_volume(sb, 1);
774 }
775
776 mlog_exit(status);
777 return status;
778 }
779
780 static int ocfs2_get_sb(struct file_system_type *fs_type,
781 int flags,
782 const char *dev_name,
783 void *data,
784 struct vfsmount *mnt)
785 {
786 return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
787 mnt);
788 }
789
790 static struct file_system_type ocfs2_fs_type = {
791 .owner = THIS_MODULE,
792 .name = "ocfs2",
793 .get_sb = ocfs2_get_sb, /* is this called when we mount
794 * the fs? */
795 .kill_sb = kill_block_super, /* set to the generic one
796 * right now, but do we
797 * need to change that? */
798 .fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
799 .next = NULL
800 };
801
802 static int ocfs2_parse_options(struct super_block *sb,
803 char *options,
804 struct mount_options *mopt,
805 int is_remount)
806 {
807 int status;
808 char *p;
809
810 mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
811 options ? options : "(none)");
812
813 mopt->commit_interval = 0;
814 mopt->mount_opt = 0;
815 mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
816 mopt->slot = OCFS2_INVALID_SLOT;
817 mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
818 mopt->cluster_stack[0] = '\0';
819
820 if (!options) {
821 status = 1;
822 goto bail;
823 }
824
825 while ((p = strsep(&options, ",")) != NULL) {
826 int token, option;
827 substring_t args[MAX_OPT_ARGS];
828
829 if (!*p)
830 continue;
831
832 token = match_token(p, tokens, args);
833 switch (token) {
834 case Opt_hb_local:
835 mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
836 break;
837 case Opt_hb_none:
838 mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
839 break;
840 case Opt_barrier:
841 if (match_int(&args[0], &option)) {
842 status = 0;
843 goto bail;
844 }
845 if (option)
846 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
847 else
848 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
849 break;
850 case Opt_intr:
851 mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
852 break;
853 case Opt_nointr:
854 mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
855 break;
856 case Opt_err_panic:
857 mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
858 break;
859 case Opt_err_ro:
860 mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
861 break;
862 case Opt_data_ordered:
863 mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
864 break;
865 case Opt_data_writeback:
866 mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
867 break;
868 case Opt_user_xattr:
869 mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
870 break;
871 case Opt_nouser_xattr:
872 mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
873 break;
874 case Opt_atime_quantum:
875 if (match_int(&args[0], &option)) {
876 status = 0;
877 goto bail;
878 }
879 if (option >= 0)
880 mopt->atime_quantum = option;
881 break;
882 case Opt_slot:
883 option = 0;
884 if (match_int(&args[0], &option)) {
885 status = 0;
886 goto bail;
887 }
888 if (option)
889 mopt->slot = (s16)option;
890 break;
891 case Opt_commit:
892 option = 0;
893 if (match_int(&args[0], &option)) {
894 status = 0;
895 goto bail;
896 }
897 if (option < 0)
898 return 0;
899 if (option == 0)
900 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
901 mopt->commit_interval = HZ * option;
902 break;
903 case Opt_localalloc:
904 option = 0;
905 if (match_int(&args[0], &option)) {
906 status = 0;
907 goto bail;
908 }
909 if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
910 mopt->localalloc_opt = option;
911 break;
912 case Opt_localflocks:
913 /*
914 * Changing this during remount could race
915 * flock() requests, or "unbalance" existing
916 * ones (e.g., a lock is taken in one mode but
917 * dropped in the other). If users care enough
918 * to flip locking modes during remount, we
919 * could add a "local" flag to individual
920 * flock structures for proper tracking of
921 * state.
922 */
923 if (!is_remount)
924 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
925 break;
926 case Opt_stack:
927 /* Check both that the option we were passed
928 * is of the right length and that it is a proper
929 * string of the right length.
930 */
931 if (((args[0].to - args[0].from) !=
932 OCFS2_STACK_LABEL_LEN) ||
933 (strnlen(args[0].from,
934 OCFS2_STACK_LABEL_LEN) !=
935 OCFS2_STACK_LABEL_LEN)) {
936 mlog(ML_ERROR,
937 "Invalid cluster_stack option\n");
938 status = 0;
939 goto bail;
940 }
941 memcpy(mopt->cluster_stack, args[0].from,
942 OCFS2_STACK_LABEL_LEN);
943 mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
944 break;
945 case Opt_inode64:
946 mopt->mount_opt |= OCFS2_MOUNT_INODE64;
947 break;
948 default:
949 mlog(ML_ERROR,
950 "Unrecognized mount option \"%s\" "
951 "or missing value\n", p);
952 status = 0;
953 goto bail;
954 }
955 }
956
957 status = 1;
958
959 bail:
960 mlog_exit(status);
961 return status;
962 }
963
964 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
965 {
966 struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
967 unsigned long opts = osb->s_mount_opt;
968 unsigned int local_alloc_megs;
969
970 if (opts & OCFS2_MOUNT_HB_LOCAL)
971 seq_printf(s, ",_netdev,heartbeat=local");
972 else
973 seq_printf(s, ",heartbeat=none");
974
975 if (opts & OCFS2_MOUNT_NOINTR)
976 seq_printf(s, ",nointr");
977
978 if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
979 seq_printf(s, ",data=writeback");
980 else
981 seq_printf(s, ",data=ordered");
982
983 if (opts & OCFS2_MOUNT_BARRIER)
984 seq_printf(s, ",barrier=1");
985
986 if (opts & OCFS2_MOUNT_ERRORS_PANIC)
987 seq_printf(s, ",errors=panic");
988 else
989 seq_printf(s, ",errors=remount-ro");
990
991 if (osb->preferred_slot != OCFS2_INVALID_SLOT)
992 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
993
994 if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
995 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
996
997 if (osb->osb_commit_interval)
998 seq_printf(s, ",commit=%u",
999 (unsigned) (osb->osb_commit_interval / HZ));
1000
1001 local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1002 if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1003 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1004
1005 if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1006 seq_printf(s, ",localflocks,");
1007
1008 if (osb->osb_cluster_stack[0])
1009 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1010 osb->osb_cluster_stack);
1011
1012 if (opts & OCFS2_MOUNT_NOUSERXATTR)
1013 seq_printf(s, ",nouser_xattr");
1014 else
1015 seq_printf(s, ",user_xattr");
1016
1017 if (opts & OCFS2_MOUNT_INODE64)
1018 seq_printf(s, ",inode64");
1019
1020 return 0;
1021 }
1022
1023 static int __init ocfs2_init(void)
1024 {
1025 int status;
1026
1027 mlog_entry_void();
1028
1029 ocfs2_print_version();
1030
1031 status = init_ocfs2_uptodate_cache();
1032 if (status < 0) {
1033 mlog_errno(status);
1034 goto leave;
1035 }
1036
1037 status = ocfs2_initialize_mem_caches();
1038 if (status < 0) {
1039 mlog_errno(status);
1040 goto leave;
1041 }
1042
1043 ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1044 if (!ocfs2_wq) {
1045 status = -ENOMEM;
1046 goto leave;
1047 }
1048
1049 ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1050 if (!ocfs2_debugfs_root) {
1051 status = -EFAULT;
1052 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1053 }
1054
1055 ocfs2_set_locking_protocol();
1056
1057 leave:
1058 if (status < 0) {
1059 ocfs2_free_mem_caches();
1060 exit_ocfs2_uptodate_cache();
1061 }
1062
1063 mlog_exit(status);
1064
1065 if (status >= 0) {
1066 return register_filesystem(&ocfs2_fs_type);
1067 } else
1068 return -1;
1069 }
1070
1071 static void __exit ocfs2_exit(void)
1072 {
1073 mlog_entry_void();
1074
1075 if (ocfs2_wq) {
1076 flush_workqueue(ocfs2_wq);
1077 destroy_workqueue(ocfs2_wq);
1078 }
1079
1080 debugfs_remove(ocfs2_debugfs_root);
1081
1082 ocfs2_free_mem_caches();
1083
1084 unregister_filesystem(&ocfs2_fs_type);
1085
1086 exit_ocfs2_uptodate_cache();
1087
1088 mlog_exit_void();
1089 }
1090
1091 static void ocfs2_put_super(struct super_block *sb)
1092 {
1093 mlog_entry("(0x%p)\n", sb);
1094
1095 ocfs2_sync_blockdev(sb);
1096 ocfs2_dismount_volume(sb, 0);
1097
1098 mlog_exit_void();
1099 }
1100
1101 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1102 {
1103 struct ocfs2_super *osb;
1104 u32 numbits, freebits;
1105 int status;
1106 struct ocfs2_dinode *bm_lock;
1107 struct buffer_head *bh = NULL;
1108 struct inode *inode = NULL;
1109
1110 mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1111
1112 osb = OCFS2_SB(dentry->d_sb);
1113
1114 inode = ocfs2_get_system_file_inode(osb,
1115 GLOBAL_BITMAP_SYSTEM_INODE,
1116 OCFS2_INVALID_SLOT);
1117 if (!inode) {
1118 mlog(ML_ERROR, "failed to get bitmap inode\n");
1119 status = -EIO;
1120 goto bail;
1121 }
1122
1123 status = ocfs2_inode_lock(inode, &bh, 0);
1124 if (status < 0) {
1125 mlog_errno(status);
1126 goto bail;
1127 }
1128
1129 bm_lock = (struct ocfs2_dinode *) bh->b_data;
1130
1131 numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1132 freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1133
1134 buf->f_type = OCFS2_SUPER_MAGIC;
1135 buf->f_bsize = dentry->d_sb->s_blocksize;
1136 buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1137 buf->f_blocks = ((sector_t) numbits) *
1138 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1139 buf->f_bfree = ((sector_t) freebits) *
1140 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1141 buf->f_bavail = buf->f_bfree;
1142 buf->f_files = numbits;
1143 buf->f_ffree = freebits;
1144
1145 brelse(bh);
1146
1147 ocfs2_inode_unlock(inode, 0);
1148 status = 0;
1149 bail:
1150 if (inode)
1151 iput(inode);
1152
1153 mlog_exit(status);
1154
1155 return status;
1156 }
1157
1158 static void ocfs2_inode_init_once(void *data)
1159 {
1160 struct ocfs2_inode_info *oi = data;
1161
1162 oi->ip_flags = 0;
1163 oi->ip_open_count = 0;
1164 spin_lock_init(&oi->ip_lock);
1165 ocfs2_extent_map_init(&oi->vfs_inode);
1166 INIT_LIST_HEAD(&oi->ip_io_markers);
1167 oi->ip_created_trans = 0;
1168 oi->ip_last_trans = 0;
1169 oi->ip_dir_start_lookup = 0;
1170
1171 init_rwsem(&oi->ip_alloc_sem);
1172 init_rwsem(&oi->ip_xattr_sem);
1173 mutex_init(&oi->ip_io_mutex);
1174
1175 oi->ip_blkno = 0ULL;
1176 oi->ip_clusters = 0;
1177
1178 ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1179 ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1180 ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1181
1182 ocfs2_metadata_cache_init(&oi->vfs_inode);
1183
1184 inode_init_once(&oi->vfs_inode);
1185 }
1186
1187 static int ocfs2_initialize_mem_caches(void)
1188 {
1189 ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1190 sizeof(struct ocfs2_inode_info),
1191 0,
1192 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1193 SLAB_MEM_SPREAD),
1194 ocfs2_inode_init_once);
1195 if (!ocfs2_inode_cachep)
1196 return -ENOMEM;
1197
1198 return 0;
1199 }
1200
1201 static void ocfs2_free_mem_caches(void)
1202 {
1203 if (ocfs2_inode_cachep)
1204 kmem_cache_destroy(ocfs2_inode_cachep);
1205
1206 ocfs2_inode_cachep = NULL;
1207 }
1208
1209 static int ocfs2_get_sector(struct super_block *sb,
1210 struct buffer_head **bh,
1211 int block,
1212 int sect_size)
1213 {
1214 if (!sb_set_blocksize(sb, sect_size)) {
1215 mlog(ML_ERROR, "unable to set blocksize\n");
1216 return -EIO;
1217 }
1218
1219 *bh = sb_getblk(sb, block);
1220 if (!*bh) {
1221 mlog_errno(-EIO);
1222 return -EIO;
1223 }
1224 lock_buffer(*bh);
1225 if (!buffer_dirty(*bh))
1226 clear_buffer_uptodate(*bh);
1227 unlock_buffer(*bh);
1228 ll_rw_block(READ, 1, bh);
1229 wait_on_buffer(*bh);
1230 return 0;
1231 }
1232
1233 static int ocfs2_mount_volume(struct super_block *sb)
1234 {
1235 int status = 0;
1236 int unlock_super = 0;
1237 struct ocfs2_super *osb = OCFS2_SB(sb);
1238
1239 mlog_entry_void();
1240
1241 if (ocfs2_is_hard_readonly(osb))
1242 goto leave;
1243
1244 status = ocfs2_dlm_init(osb);
1245 if (status < 0) {
1246 mlog_errno(status);
1247 goto leave;
1248 }
1249
1250 status = ocfs2_super_lock(osb, 1);
1251 if (status < 0) {
1252 mlog_errno(status);
1253 goto leave;
1254 }
1255 unlock_super = 1;
1256
1257 /* This will load up the node map and add ourselves to it. */
1258 status = ocfs2_find_slot(osb);
1259 if (status < 0) {
1260 mlog_errno(status);
1261 goto leave;
1262 }
1263
1264 /* load all node-local system inodes */
1265 status = ocfs2_init_local_system_inodes(osb);
1266 if (status < 0) {
1267 mlog_errno(status);
1268 goto leave;
1269 }
1270
1271 status = ocfs2_check_volume(osb);
1272 if (status < 0) {
1273 mlog_errno(status);
1274 goto leave;
1275 }
1276
1277 status = ocfs2_truncate_log_init(osb);
1278 if (status < 0) {
1279 mlog_errno(status);
1280 goto leave;
1281 }
1282
1283 if (ocfs2_mount_local(osb))
1284 goto leave;
1285
1286 leave:
1287 if (unlock_super)
1288 ocfs2_super_unlock(osb, 1);
1289
1290 mlog_exit(status);
1291 return status;
1292 }
1293
1294 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1295 {
1296 int tmp, hangup_needed = 0;
1297 struct ocfs2_super *osb = NULL;
1298 char nodestr[8];
1299
1300 mlog_entry("(0x%p)\n", sb);
1301
1302 BUG_ON(!sb);
1303 osb = OCFS2_SB(sb);
1304 BUG_ON(!osb);
1305
1306 ocfs2_shutdown_local_alloc(osb);
1307
1308 ocfs2_truncate_log_shutdown(osb);
1309
1310 /* This will disable recovery and flush any recovery work. */
1311 ocfs2_recovery_exit(osb);
1312
1313 ocfs2_journal_shutdown(osb);
1314
1315 ocfs2_sync_blockdev(sb);
1316
1317 /* No cluster connection means we've failed during mount, so skip
1318 * all the steps which depended on that to complete. */
1319 if (osb->cconn) {
1320 tmp = ocfs2_super_lock(osb, 1);
1321 if (tmp < 0) {
1322 mlog_errno(tmp);
1323 return;
1324 }
1325 }
1326
1327 if (osb->slot_num != OCFS2_INVALID_SLOT)
1328 ocfs2_put_slot(osb);
1329
1330 if (osb->cconn)
1331 ocfs2_super_unlock(osb, 1);
1332
1333 ocfs2_release_system_inodes(osb);
1334
1335 /*
1336 * If we're dismounting due to mount error, mount.ocfs2 will clean
1337 * up heartbeat. If we're a local mount, there is no heartbeat.
1338 * If we failed before we got a uuid_str yet, we can't stop
1339 * heartbeat. Otherwise, do it.
1340 */
1341 if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1342 hangup_needed = 1;
1343
1344 if (osb->cconn)
1345 ocfs2_dlm_shutdown(osb, hangup_needed);
1346
1347 debugfs_remove(osb->osb_debug_root);
1348
1349 if (hangup_needed)
1350 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1351
1352 atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1353
1354 if (ocfs2_mount_local(osb))
1355 snprintf(nodestr, sizeof(nodestr), "local");
1356 else
1357 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1358
1359 printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1360 osb->dev_str, nodestr);
1361
1362 ocfs2_delete_osb(osb);
1363 kfree(osb);
1364 sb->s_dev = 0;
1365 sb->s_fs_info = NULL;
1366 }
1367
1368 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1369 unsigned uuid_bytes)
1370 {
1371 int i, ret;
1372 char *ptr;
1373
1374 BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1375
1376 osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1377 if (osb->uuid_str == NULL)
1378 return -ENOMEM;
1379
1380 for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1381 /* print with null */
1382 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1383 if (ret != 2) /* drop super cleans up */
1384 return -EINVAL;
1385 /* then only advance past the last char */
1386 ptr += 2;
1387 }
1388
1389 return 0;
1390 }
1391
1392 static int ocfs2_initialize_super(struct super_block *sb,
1393 struct buffer_head *bh,
1394 int sector_size)
1395 {
1396 int status;
1397 int i, cbits, bbits;
1398 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1399 struct inode *inode = NULL;
1400 struct ocfs2_journal *journal;
1401 __le32 uuid_net_key;
1402 struct ocfs2_super *osb;
1403
1404 mlog_entry_void();
1405
1406 osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1407 if (!osb) {
1408 status = -ENOMEM;
1409 mlog_errno(status);
1410 goto bail;
1411 }
1412
1413 sb->s_fs_info = osb;
1414 sb->s_op = &ocfs2_sops;
1415 sb->s_export_op = &ocfs2_export_ops;
1416 sb->s_xattr = ocfs2_xattr_handlers;
1417 sb->s_time_gran = 1;
1418 sb->s_flags |= MS_NOATIME;
1419 /* this is needed to support O_LARGEFILE */
1420 cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1421 bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1422 sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1423
1424 osb->sb = sb;
1425 /* Save off for ocfs2_rw_direct */
1426 osb->s_sectsize_bits = blksize_bits(sector_size);
1427 BUG_ON(!osb->s_sectsize_bits);
1428
1429 spin_lock_init(&osb->dc_task_lock);
1430 init_waitqueue_head(&osb->dc_event);
1431 osb->dc_work_sequence = 0;
1432 osb->dc_wake_sequence = 0;
1433 INIT_LIST_HEAD(&osb->blocked_lock_list);
1434 osb->blocked_lock_count = 0;
1435 spin_lock_init(&osb->osb_lock);
1436 ocfs2_init_inode_steal_slot(osb);
1437
1438 atomic_set(&osb->alloc_stats.moves, 0);
1439 atomic_set(&osb->alloc_stats.local_data, 0);
1440 atomic_set(&osb->alloc_stats.bitmap_data, 0);
1441 atomic_set(&osb->alloc_stats.bg_allocs, 0);
1442 atomic_set(&osb->alloc_stats.bg_extends, 0);
1443
1444 ocfs2_init_node_maps(osb);
1445
1446 snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1447 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1448
1449 status = ocfs2_recovery_init(osb);
1450 if (status) {
1451 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1452 mlog_errno(status);
1453 goto bail;
1454 }
1455
1456 init_waitqueue_head(&osb->checkpoint_event);
1457 atomic_set(&osb->needs_checkpoint, 0);
1458
1459 osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1460
1461 osb->slot_num = OCFS2_INVALID_SLOT;
1462
1463 osb->s_xattr_inline_size = le16_to_cpu(
1464 di->id2.i_super.s_xattr_inline_size);
1465
1466 osb->local_alloc_state = OCFS2_LA_UNUSED;
1467 osb->local_alloc_bh = NULL;
1468 INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
1469
1470 init_waitqueue_head(&osb->osb_mount_event);
1471
1472 osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1473 if (!osb->vol_label) {
1474 mlog(ML_ERROR, "unable to alloc vol label\n");
1475 status = -ENOMEM;
1476 goto bail;
1477 }
1478
1479 osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1480 if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1481 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1482 osb->max_slots);
1483 status = -EINVAL;
1484 goto bail;
1485 }
1486 mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1487
1488 osb->slot_recovery_generations =
1489 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
1490 GFP_KERNEL);
1491 if (!osb->slot_recovery_generations) {
1492 status = -ENOMEM;
1493 mlog_errno(status);
1494 goto bail;
1495 }
1496
1497 init_waitqueue_head(&osb->osb_wipe_event);
1498 osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1499 sizeof(*osb->osb_orphan_wipes),
1500 GFP_KERNEL);
1501 if (!osb->osb_orphan_wipes) {
1502 status = -ENOMEM;
1503 mlog_errno(status);
1504 goto bail;
1505 }
1506
1507 osb->s_feature_compat =
1508 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1509 osb->s_feature_ro_compat =
1510 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1511 osb->s_feature_incompat =
1512 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1513
1514 if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1515 mlog(ML_ERROR, "couldn't mount because of unsupported "
1516 "optional features (%x).\n", i);
1517 status = -EINVAL;
1518 goto bail;
1519 }
1520 if (!(osb->sb->s_flags & MS_RDONLY) &&
1521 (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1522 mlog(ML_ERROR, "couldn't mount RDWR because of "
1523 "unsupported optional features (%x).\n", i);
1524 status = -EINVAL;
1525 goto bail;
1526 }
1527
1528 if (ocfs2_userspace_stack(osb)) {
1529 memcpy(osb->osb_cluster_stack,
1530 OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
1531 OCFS2_STACK_LABEL_LEN);
1532 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1533 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
1534 mlog(ML_ERROR,
1535 "couldn't mount because of an invalid "
1536 "cluster stack label (%s) \n",
1537 osb->osb_cluster_stack);
1538 status = -EINVAL;
1539 goto bail;
1540 }
1541 } else {
1542 /* The empty string is identical with classic tools that
1543 * don't know about s_cluster_info. */
1544 osb->osb_cluster_stack[0] = '\0';
1545 }
1546
1547 get_random_bytes(&osb->s_next_generation, sizeof(u32));
1548
1549 /* FIXME
1550 * This should be done in ocfs2_journal_init(), but unknown
1551 * ordering issues will cause the filesystem to crash.
1552 * If anyone wants to figure out what part of the code
1553 * refers to osb->journal before ocfs2_journal_init() is run,
1554 * be my guest.
1555 */
1556 /* initialize our journal structure */
1557
1558 journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1559 if (!journal) {
1560 mlog(ML_ERROR, "unable to alloc journal\n");
1561 status = -ENOMEM;
1562 goto bail;
1563 }
1564 osb->journal = journal;
1565 journal->j_osb = osb;
1566
1567 atomic_set(&journal->j_num_trans, 0);
1568 init_rwsem(&journal->j_trans_barrier);
1569 init_waitqueue_head(&journal->j_checkpointed);
1570 spin_lock_init(&journal->j_lock);
1571 journal->j_trans_id = (unsigned long) 1;
1572 INIT_LIST_HEAD(&journal->j_la_cleanups);
1573 INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1574 journal->j_state = OCFS2_JOURNAL_FREE;
1575
1576 /* get some pseudo constants for clustersize bits */
1577 osb->s_clustersize_bits =
1578 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1579 osb->s_clustersize = 1 << osb->s_clustersize_bits;
1580 mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1581
1582 if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1583 osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1584 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1585 osb->s_clustersize);
1586 status = -EINVAL;
1587 goto bail;
1588 }
1589
1590 if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1591 > (u32)~0UL) {
1592 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1593 "what jbd can address in 32 bits.\n");
1594 status = -EINVAL;
1595 goto bail;
1596 }
1597
1598 if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1599 sizeof(di->id2.i_super.s_uuid))) {
1600 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1601 status = -ENOMEM;
1602 goto bail;
1603 }
1604
1605 memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1606
1607 strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1608 osb->vol_label[63] = '\0';
1609 osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1610 osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1611 osb->first_cluster_group_blkno =
1612 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1613 osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1614 osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1615 mlog(0, "vol_label: %s\n", osb->vol_label);
1616 mlog(0, "uuid: %s\n", osb->uuid_str);
1617 mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1618 (unsigned long long)osb->root_blkno,
1619 (unsigned long long)osb->system_dir_blkno);
1620
1621 osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1622 if (!osb->osb_dlm_debug) {
1623 status = -ENOMEM;
1624 mlog_errno(status);
1625 goto bail;
1626 }
1627
1628 atomic_set(&osb->vol_state, VOLUME_INIT);
1629
1630 /* load root, system_dir, and all global system inodes */
1631 status = ocfs2_init_global_system_inodes(osb);
1632 if (status < 0) {
1633 mlog_errno(status);
1634 goto bail;
1635 }
1636
1637 /*
1638 * global bitmap
1639 */
1640 inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1641 OCFS2_INVALID_SLOT);
1642 if (!inode) {
1643 status = -EINVAL;
1644 mlog_errno(status);
1645 goto bail;
1646 }
1647
1648 osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1649 iput(inode);
1650
1651 osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1652
1653 status = ocfs2_init_slot_info(osb);
1654 if (status < 0) {
1655 mlog_errno(status);
1656 goto bail;
1657 }
1658
1659 bail:
1660 mlog_exit(status);
1661 return status;
1662 }
1663
1664 /*
1665 * will return: -EAGAIN if it is ok to keep searching for superblocks
1666 * -EINVAL if there is a bad superblock
1667 * 0 on success
1668 */
1669 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1670 struct buffer_head *bh,
1671 u32 blksz)
1672 {
1673 int status = -EAGAIN;
1674
1675 mlog_entry_void();
1676
1677 if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1678 strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1679 status = -EINVAL;
1680 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1681 mlog(ML_ERROR, "found superblock with incorrect block "
1682 "size: found %u, should be %u\n",
1683 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1684 blksz);
1685 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1686 OCFS2_MAJOR_REV_LEVEL ||
1687 le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1688 OCFS2_MINOR_REV_LEVEL) {
1689 mlog(ML_ERROR, "found superblock with bad version: "
1690 "found %u.%u, should be %u.%u\n",
1691 le16_to_cpu(di->id2.i_super.s_major_rev_level),
1692 le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1693 OCFS2_MAJOR_REV_LEVEL,
1694 OCFS2_MINOR_REV_LEVEL);
1695 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1696 mlog(ML_ERROR, "bad block number on superblock: "
1697 "found %llu, should be %llu\n",
1698 (unsigned long long)le64_to_cpu(di->i_blkno),
1699 (unsigned long long)bh->b_blocknr);
1700 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1701 le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1702 mlog(ML_ERROR, "bad cluster size found: %u\n",
1703 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1704 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1705 mlog(ML_ERROR, "bad root_blkno: 0\n");
1706 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1707 mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1708 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1709 mlog(ML_ERROR,
1710 "Superblock slots found greater than file system "
1711 "maximum: found %u, max %u\n",
1712 le16_to_cpu(di->id2.i_super.s_max_slots),
1713 OCFS2_MAX_SLOTS);
1714 } else {
1715 /* found it! */
1716 status = 0;
1717 }
1718 }
1719
1720 mlog_exit(status);
1721 return status;
1722 }
1723
1724 static int ocfs2_check_volume(struct ocfs2_super *osb)
1725 {
1726 int status;
1727 int dirty;
1728 int local;
1729 struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1730 * recover
1731 * ourselves. */
1732
1733 mlog_entry_void();
1734
1735 /* Init our journal object. */
1736 status = ocfs2_journal_init(osb->journal, &dirty);
1737 if (status < 0) {
1738 mlog(ML_ERROR, "Could not initialize journal!\n");
1739 goto finally;
1740 }
1741
1742 /* If the journal was unmounted cleanly then we don't want to
1743 * recover anything. Otherwise, journal_load will do that
1744 * dirty work for us :) */
1745 if (!dirty) {
1746 status = ocfs2_journal_wipe(osb->journal, 0);
1747 if (status < 0) {
1748 mlog_errno(status);
1749 goto finally;
1750 }
1751 } else {
1752 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1753 "recovering volume.\n");
1754 }
1755
1756 local = ocfs2_mount_local(osb);
1757
1758 /* will play back anything left in the journal. */
1759 status = ocfs2_journal_load(osb->journal, local, dirty);
1760 if (status < 0) {
1761 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
1762 goto finally;
1763 }
1764
1765 if (dirty) {
1766 /* recover my local alloc if we didn't unmount cleanly. */
1767 status = ocfs2_begin_local_alloc_recovery(osb,
1768 osb->slot_num,
1769 &local_alloc);
1770 if (status < 0) {
1771 mlog_errno(status);
1772 goto finally;
1773 }
1774 /* we complete the recovery process after we've marked
1775 * ourselves as mounted. */
1776 }
1777
1778 mlog(0, "Journal loaded.\n");
1779
1780 status = ocfs2_load_local_alloc(osb);
1781 if (status < 0) {
1782 mlog_errno(status);
1783 goto finally;
1784 }
1785
1786 if (dirty) {
1787 /* Recovery will be completed after we've mounted the
1788 * rest of the volume. */
1789 osb->dirty = 1;
1790 osb->local_alloc_copy = local_alloc;
1791 local_alloc = NULL;
1792 }
1793
1794 /* go through each journal, trylock it and if you get the
1795 * lock, and it's marked as dirty, set the bit in the recover
1796 * map and launch a recovery thread for it. */
1797 status = ocfs2_mark_dead_nodes(osb);
1798 if (status < 0)
1799 mlog_errno(status);
1800
1801 finally:
1802 if (local_alloc)
1803 kfree(local_alloc);
1804
1805 mlog_exit(status);
1806 return status;
1807 }
1808
1809 /*
1810 * The routine gets called from dismount or close whenever a dismount on
1811 * volume is requested and the osb open count becomes 1.
1812 * It will remove the osb from the global list and also free up all the
1813 * initialized resources and fileobject.
1814 */
1815 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1816 {
1817 mlog_entry_void();
1818
1819 /* This function assumes that the caller has the main osb resource */
1820
1821 ocfs2_free_slot_info(osb);
1822
1823 kfree(osb->osb_orphan_wipes);
1824 kfree(osb->slot_recovery_generations);
1825 /* FIXME
1826 * This belongs in journal shutdown, but because we have to
1827 * allocate osb->journal at the start of ocfs2_initalize_osb(),
1828 * we free it here.
1829 */
1830 kfree(osb->journal);
1831 if (osb->local_alloc_copy)
1832 kfree(osb->local_alloc_copy);
1833 kfree(osb->uuid_str);
1834 ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1835 memset(osb, 0, sizeof(struct ocfs2_super));
1836
1837 mlog_exit_void();
1838 }
1839
1840 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1841 * panic(). We do not support continue-on-error operation. */
1842 static void ocfs2_handle_error(struct super_block *sb)
1843 {
1844 struct ocfs2_super *osb = OCFS2_SB(sb);
1845
1846 if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1847 panic("OCFS2: (device %s): panic forced after error\n",
1848 sb->s_id);
1849
1850 ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1851
1852 if (sb->s_flags & MS_RDONLY &&
1853 (ocfs2_is_soft_readonly(osb) ||
1854 ocfs2_is_hard_readonly(osb)))
1855 return;
1856
1857 printk(KERN_CRIT "File system is now read-only due to the potential "
1858 "of on-disk corruption. Please run fsck.ocfs2 once the file "
1859 "system is unmounted.\n");
1860 sb->s_flags |= MS_RDONLY;
1861 ocfs2_set_ro_flag(osb, 0);
1862 }
1863
1864 static char error_buf[1024];
1865
1866 void __ocfs2_error(struct super_block *sb,
1867 const char *function,
1868 const char *fmt, ...)
1869 {
1870 va_list args;
1871
1872 va_start(args, fmt);
1873 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1874 va_end(args);
1875
1876 /* Not using mlog here because we want to show the actual
1877 * function the error came from. */
1878 printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1879 sb->s_id, function, error_buf);
1880
1881 ocfs2_handle_error(sb);
1882 }
1883
1884 /* Handle critical errors. This is intentionally more drastic than
1885 * ocfs2_handle_error, so we only use for things like journal errors,
1886 * etc. */
1887 void __ocfs2_abort(struct super_block* sb,
1888 const char *function,
1889 const char *fmt, ...)
1890 {
1891 va_list args;
1892
1893 va_start(args, fmt);
1894 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1895 va_end(args);
1896
1897 printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1898 sb->s_id, function, error_buf);
1899
1900 /* We don't have the cluster support yet to go straight to
1901 * hard readonly in here. Until then, we want to keep
1902 * ocfs2_abort() so that we can at least mark critical
1903 * errors.
1904 *
1905 * TODO: This should abort the journal and alert other nodes
1906 * that our slot needs recovery. */
1907
1908 /* Force a panic(). This stinks, but it's better than letting
1909 * things continue without having a proper hard readonly
1910 * here. */
1911 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1912 ocfs2_handle_error(sb);
1913 }
1914
1915 module_init(ocfs2_init);
1916 module_exit(ocfs2_exit);
Linux with added FPC-III support