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i2o: sg chaining support
[wrt350n-kernel.git] / fs / ocfs2 / super.c
blob0e2a1b45bf922f909936d1af3212e4e6d469edfd
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * super.c
5 *
6 * load/unload driver, mount/dismount volumes
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/utsname.h>
32 #include <linux/init.h>
33 #include <linux/random.h>
34 #include <linux/statfs.h>
35 #include <linux/moduleparam.h>
36 #include <linux/blkdev.h>
37 #include <linux/socket.h>
38 #include <linux/inet.h>
39 #include <linux/parser.h>
40 #include <linux/crc32.h>
41 #include <linux/debugfs.h>
42 #include <linux/mount.h>
43
44 #include <cluster/nodemanager.h>
45
46 #define MLOG_MASK_PREFIX ML_SUPER
47 #include <cluster/masklog.h>
48
49 #include "ocfs2.h"
50
51 /* this should be the only file to include a version 1 header */
52 #include "ocfs1_fs_compat.h"
53
54 #include "alloc.h"
55 #include "dlmglue.h"
56 #include "export.h"
57 #include "extent_map.h"
58 #include "heartbeat.h"
59 #include "inode.h"
60 #include "journal.h"
61 #include "localalloc.h"
62 #include "namei.h"
63 #include "slot_map.h"
64 #include "super.h"
65 #include "sysfile.h"
66 #include "uptodate.h"
67 #include "ver.h"
68 #include "vote.h"
69
70 #include "buffer_head_io.h"
71
72 static struct kmem_cache *ocfs2_inode_cachep = NULL;
73
74 /* OCFS2 needs to schedule several differnt types of work which
75 * require cluster locking, disk I/O, recovery waits, etc. Since these
76 * types of work tend to be heavy we avoid using the kernel events
77 * workqueue and schedule on our own. */
78 struct workqueue_struct *ocfs2_wq = NULL;
79
80 static struct dentry *ocfs2_debugfs_root = NULL;
81
82 MODULE_AUTHOR("Oracle");
83 MODULE_LICENSE("GPL");
84
85 struct mount_options
86 {
87 unsigned long mount_opt;
88 unsigned int atime_quantum;
89 signed short slot;
90 };
91
92 static int ocfs2_parse_options(struct super_block *sb, char *options,
93 struct mount_options *mopt,
94 int is_remount);
95 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
96 static void ocfs2_put_super(struct super_block *sb);
97 static int ocfs2_mount_volume(struct super_block *sb);
98 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
99 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
100 static int ocfs2_initialize_mem_caches(void);
101 static void ocfs2_free_mem_caches(void);
102 static void ocfs2_delete_osb(struct ocfs2_super *osb);
103
104 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
105
106 static int ocfs2_sync_fs(struct super_block *sb, int wait);
107
108 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
109 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
110 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
111 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
112 static int ocfs2_check_volume(struct ocfs2_super *osb);
113 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
114 struct buffer_head *bh,
115 u32 sectsize);
116 static int ocfs2_initialize_super(struct super_block *sb,
117 struct buffer_head *bh,
118 int sector_size);
119 static int ocfs2_get_sector(struct super_block *sb,
120 struct buffer_head **bh,
121 int block,
122 int sect_size);
123 static void ocfs2_write_super(struct super_block *sb);
124 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
125 static void ocfs2_destroy_inode(struct inode *inode);
126
127 static const struct super_operations ocfs2_sops = {
128 .statfs = ocfs2_statfs,
129 .alloc_inode = ocfs2_alloc_inode,
130 .destroy_inode = ocfs2_destroy_inode,
131 .drop_inode = ocfs2_drop_inode,
132 .clear_inode = ocfs2_clear_inode,
133 .delete_inode = ocfs2_delete_inode,
134 .sync_fs = ocfs2_sync_fs,
135 .write_super = ocfs2_write_super,
136 .put_super = ocfs2_put_super,
137 .remount_fs = ocfs2_remount,
138 .show_options = ocfs2_show_options,
139 };
140
141 enum {
142 Opt_barrier,
143 Opt_err_panic,
144 Opt_err_ro,
145 Opt_intr,
146 Opt_nointr,
147 Opt_hb_none,
148 Opt_hb_local,
149 Opt_data_ordered,
150 Opt_data_writeback,
151 Opt_atime_quantum,
152 Opt_slot,
153 Opt_err,
154 };
155
156 static match_table_t tokens = {
157 {Opt_barrier, "barrier=%u"},
158 {Opt_err_panic, "errors=panic"},
159 {Opt_err_ro, "errors=remount-ro"},
160 {Opt_intr, "intr"},
161 {Opt_nointr, "nointr"},
162 {Opt_hb_none, OCFS2_HB_NONE},
163 {Opt_hb_local, OCFS2_HB_LOCAL},
164 {Opt_data_ordered, "data=ordered"},
165 {Opt_data_writeback, "data=writeback"},
166 {Opt_atime_quantum, "atime_quantum=%u"},
167 {Opt_slot, "preferred_slot=%u"},
168 {Opt_err, NULL}
169 };
170
171 /*
172 * write_super and sync_fs ripped right out of ext3.
173 */
174 static void ocfs2_write_super(struct super_block *sb)
175 {
176 if (mutex_trylock(&sb->s_lock) != 0)
177 BUG();
178 sb->s_dirt = 0;
179 }
180
181 static int ocfs2_sync_fs(struct super_block *sb, int wait)
182 {
183 int status;
184 tid_t target;
185 struct ocfs2_super *osb = OCFS2_SB(sb);
186
187 sb->s_dirt = 0;
188
189 if (ocfs2_is_hard_readonly(osb))
190 return -EROFS;
191
192 if (wait) {
193 status = ocfs2_flush_truncate_log(osb);
194 if (status < 0)
195 mlog_errno(status);
196 } else {
197 ocfs2_schedule_truncate_log_flush(osb, 0);
198 }
199
200 if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
201 if (wait)
202 log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
203 target);
204 }
205 return 0;
206 }
207
208 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
209 {
210 struct inode *new = NULL;
211 int status = 0;
212 int i;
213
214 mlog_entry_void();
215
216 new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
217 if (IS_ERR(new)) {
218 status = PTR_ERR(new);
219 mlog_errno(status);
220 goto bail;
221 }
222 osb->root_inode = new;
223
224 new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
225 if (IS_ERR(new)) {
226 status = PTR_ERR(new);
227 mlog_errno(status);
228 goto bail;
229 }
230 osb->sys_root_inode = new;
231
232 for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
233 i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
234 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
235 if (!new) {
236 ocfs2_release_system_inodes(osb);
237 status = -EINVAL;
238 mlog_errno(status);
239 /* FIXME: Should ERROR_RO_FS */
240 mlog(ML_ERROR, "Unable to load system inode %d, "
241 "possibly corrupt fs?", i);
242 goto bail;
243 }
244 // the array now has one ref, so drop this one
245 iput(new);
246 }
247
248 bail:
249 mlog_exit(status);
250 return status;
251 }
252
253 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
254 {
255 struct inode *new = NULL;
256 int status = 0;
257 int i;
258
259 mlog_entry_void();
260
261 for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
262 i < NUM_SYSTEM_INODES;
263 i++) {
264 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
265 if (!new) {
266 ocfs2_release_system_inodes(osb);
267 status = -EINVAL;
268 mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
269 status, i, osb->slot_num);
270 goto bail;
271 }
272 /* the array now has one ref, so drop this one */
273 iput(new);
274 }
275
276 bail:
277 mlog_exit(status);
278 return status;
279 }
280
281 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
282 {
283 int i;
284 struct inode *inode;
285
286 mlog_entry_void();
287
288 for (i = 0; i < NUM_SYSTEM_INODES; i++) {
289 inode = osb->system_inodes[i];
290 if (inode) {
291 iput(inode);
292 osb->system_inodes[i] = NULL;
293 }
294 }
295
296 inode = osb->sys_root_inode;
297 if (inode) {
298 iput(inode);
299 osb->sys_root_inode = NULL;
300 }
301
302 inode = osb->root_inode;
303 if (inode) {
304 iput(inode);
305 osb->root_inode = NULL;
306 }
307
308 mlog_exit(0);
309 }
310
311 /* We're allocating fs objects, use GFP_NOFS */
312 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
313 {
314 struct ocfs2_inode_info *oi;
315
316 oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
317 if (!oi)
318 return NULL;
319
320 return &oi->vfs_inode;
321 }
322
323 static void ocfs2_destroy_inode(struct inode *inode)
324 {
325 kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
326 }
327
328 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
329 unsigned int cbits)
330 {
331 unsigned int bytes = 1 << cbits;
332 unsigned int trim = bytes;
333 unsigned int bitshift = 32;
334
335 /*
336 * i_size and all block offsets in ocfs2 are always 64 bits
337 * wide. i_clusters is 32 bits, in cluster-sized units. So on
338 * 64 bit platforms, cluster size will be the limiting factor.
339 */
340
341 #if BITS_PER_LONG == 32
342 # if defined(CONFIG_LBD)
343 BUILD_BUG_ON(sizeof(sector_t) != 8);
344 /*
345 * We might be limited by page cache size.
346 */
347 if (bytes > PAGE_CACHE_SIZE) {
348 bytes = PAGE_CACHE_SIZE;
349 trim = 1;
350 /*
351 * Shift by 31 here so that we don't get larger than
352 * MAX_LFS_FILESIZE
353 */
354 bitshift = 31;
355 }
356 # else
357 /*
358 * We are limited by the size of sector_t. Use block size, as
359 * that's what we expose to the VFS.
360 */
361 bytes = 1 << bbits;
362 trim = 1;
363 bitshift = 31;
364 # endif
365 #endif
366
367 /*
368 * Trim by a whole cluster when we can actually approach the
369 * on-disk limits. Otherwise we can overflow i_clusters when
370 * an extent start is at the max offset.
371 */
372 return (((unsigned long long)bytes) << bitshift) - trim;
373 }
374
375 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
376 {
377 int incompat_features;
378 int ret = 0;
379 struct mount_options parsed_options;
380 struct ocfs2_super *osb = OCFS2_SB(sb);
381
382 if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
383 ret = -EINVAL;
384 goto out;
385 }
386
387 if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
388 (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
389 ret = -EINVAL;
390 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
391 goto out;
392 }
393
394 if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
395 (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
396 ret = -EINVAL;
397 mlog(ML_ERROR, "Cannot change data mode on remount\n");
398 goto out;
399 }
400
401 /* We're going to/from readonly mode. */
402 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
403 /* Lock here so the check of HARD_RO and the potential
404 * setting of SOFT_RO is atomic. */
405 spin_lock(&osb->osb_lock);
406 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
407 mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
408 ret = -EROFS;
409 goto unlock_osb;
410 }
411
412 if (*flags & MS_RDONLY) {
413 mlog(0, "Going to ro mode.\n");
414 sb->s_flags |= MS_RDONLY;
415 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
416 } else {
417 mlog(0, "Making ro filesystem writeable.\n");
418
419 if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
420 mlog(ML_ERROR, "Cannot remount RDWR "
421 "filesystem due to previous errors.\n");
422 ret = -EROFS;
423 goto unlock_osb;
424 }
425 incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
426 if (incompat_features) {
427 mlog(ML_ERROR, "Cannot remount RDWR because "
428 "of unsupported optional features "
429 "(%x).\n", incompat_features);
430 ret = -EINVAL;
431 goto unlock_osb;
432 }
433 sb->s_flags &= ~MS_RDONLY;
434 osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
435 }
436 unlock_osb:
437 spin_unlock(&osb->osb_lock);
438 }
439
440 if (!ret) {
441 if (!ocfs2_is_hard_readonly(osb))
442 ocfs2_set_journal_params(osb);
443
444 /* Only save off the new mount options in case of a successful
445 * remount. */
446 osb->s_mount_opt = parsed_options.mount_opt;
447 osb->s_atime_quantum = parsed_options.atime_quantum;
448 osb->preferred_slot = parsed_options.slot;
449 }
450 out:
451 return ret;
452 }
453
454 static int ocfs2_sb_probe(struct super_block *sb,
455 struct buffer_head **bh,
456 int *sector_size)
457 {
458 int status, tmpstat;
459 struct ocfs1_vol_disk_hdr *hdr;
460 struct ocfs2_dinode *di;
461 int blksize;
462
463 *bh = NULL;
464
465 /* may be > 512 */
466 *sector_size = bdev_hardsect_size(sb->s_bdev);
467 if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
468 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
469 *sector_size, OCFS2_MAX_BLOCKSIZE);
470 status = -EINVAL;
471 goto bail;
472 }
473
474 /* Can this really happen? */
475 if (*sector_size < OCFS2_MIN_BLOCKSIZE)
476 *sector_size = OCFS2_MIN_BLOCKSIZE;
477
478 /* check block zero for old format */
479 status = ocfs2_get_sector(sb, bh, 0, *sector_size);
480 if (status < 0) {
481 mlog_errno(status);
482 goto bail;
483 }
484 hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
485 if (hdr->major_version == OCFS1_MAJOR_VERSION) {
486 mlog(ML_ERROR, "incompatible version: %u.%u\n",
487 hdr->major_version, hdr->minor_version);
488 status = -EINVAL;
489 }
490 if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
491 strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
492 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
493 hdr->signature);
494 status = -EINVAL;
495 }
496 brelse(*bh);
497 *bh = NULL;
498 if (status < 0) {
499 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
500 "upgraded before mounting with ocfs v2\n");
501 goto bail;
502 }
503
504 /*
505 * Now check at magic offset for 512, 1024, 2048, 4096
506 * blocksizes. 4096 is the maximum blocksize because it is
507 * the minimum clustersize.
508 */
509 status = -EINVAL;
510 for (blksize = *sector_size;
511 blksize <= OCFS2_MAX_BLOCKSIZE;
512 blksize <<= 1) {
513 tmpstat = ocfs2_get_sector(sb, bh,
514 OCFS2_SUPER_BLOCK_BLKNO,
515 blksize);
516 if (tmpstat < 0) {
517 status = tmpstat;
518 mlog_errno(status);
519 goto bail;
520 }
521 di = (struct ocfs2_dinode *) (*bh)->b_data;
522 status = ocfs2_verify_volume(di, *bh, blksize);
523 if (status >= 0)
524 goto bail;
525 brelse(*bh);
526 *bh = NULL;
527 if (status != -EAGAIN)
528 break;
529 }
530
531 bail:
532 return status;
533 }
534
535 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
536 {
537 if (ocfs2_mount_local(osb)) {
538 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
539 mlog(ML_ERROR, "Cannot heartbeat on a locally "
540 "mounted device.\n");
541 return -EINVAL;
542 }
543 }
544
545 if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
546 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
547 mlog(ML_ERROR, "Heartbeat has to be started to mount "
548 "a read-write clustered device.\n");
549 return -EINVAL;
550 }
551 }
552
553 return 0;
554 }
555
556 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
557 {
558 struct dentry *root;
559 int status, sector_size;
560 struct mount_options parsed_options;
561 struct inode *inode = NULL;
562 struct ocfs2_super *osb = NULL;
563 struct buffer_head *bh = NULL;
564 char nodestr[8];
565
566 mlog_entry("%p, %p, %i", sb, data, silent);
567
568 if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
569 status = -EINVAL;
570 goto read_super_error;
571 }
572
573 /* for now we only have one cluster/node, make sure we see it
574 * in the heartbeat universe */
575 if (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL) {
576 if (!o2hb_check_local_node_heartbeating()) {
577 status = -EINVAL;
578 goto read_super_error;
579 }
580 }
581
582 /* probe for superblock */
583 status = ocfs2_sb_probe(sb, &bh, &sector_size);
584 if (status < 0) {
585 mlog(ML_ERROR, "superblock probe failed!\n");
586 goto read_super_error;
587 }
588
589 status = ocfs2_initialize_super(sb, bh, sector_size);
590 osb = OCFS2_SB(sb);
591 if (status < 0) {
592 mlog_errno(status);
593 goto read_super_error;
594 }
595 brelse(bh);
596 bh = NULL;
597 osb->s_mount_opt = parsed_options.mount_opt;
598 osb->s_atime_quantum = parsed_options.atime_quantum;
599 osb->preferred_slot = parsed_options.slot;
600
601 sb->s_magic = OCFS2_SUPER_MAGIC;
602
603 /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
604 * heartbeat=none */
605 if (bdev_read_only(sb->s_bdev)) {
606 if (!(sb->s_flags & MS_RDONLY)) {
607 status = -EACCES;
608 mlog(ML_ERROR, "Readonly device detected but readonly "
609 "mount was not specified.\n");
610 goto read_super_error;
611 }
612
613 /* You should not be able to start a local heartbeat
614 * on a readonly device. */
615 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
616 status = -EROFS;
617 mlog(ML_ERROR, "Local heartbeat specified on readonly "
618 "device.\n");
619 goto read_super_error;
620 }
621
622 status = ocfs2_check_journals_nolocks(osb);
623 if (status < 0) {
624 if (status == -EROFS)
625 mlog(ML_ERROR, "Recovery required on readonly "
626 "file system, but write access is "
627 "unavailable.\n");
628 else
629 mlog_errno(status);
630 goto read_super_error;
631 }
632
633 ocfs2_set_ro_flag(osb, 1);
634
635 printk(KERN_NOTICE "Readonly device detected. No cluster "
636 "services will be utilized for this mount. Recovery "
637 "will be skipped.\n");
638 }
639
640 if (!ocfs2_is_hard_readonly(osb)) {
641 if (sb->s_flags & MS_RDONLY)
642 ocfs2_set_ro_flag(osb, 0);
643 }
644
645 status = ocfs2_verify_heartbeat(osb);
646 if (status < 0) {
647 mlog_errno(status);
648 goto read_super_error;
649 }
650
651 osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
652 ocfs2_debugfs_root);
653 if (!osb->osb_debug_root) {
654 status = -EINVAL;
655 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
656 goto read_super_error;
657 }
658
659 status = ocfs2_mount_volume(sb);
660 if (osb->root_inode)
661 inode = igrab(osb->root_inode);
662
663 if (status < 0)
664 goto read_super_error;
665
666 if (!inode) {
667 status = -EIO;
668 mlog_errno(status);
669 goto read_super_error;
670 }
671
672 root = d_alloc_root(inode);
673 if (!root) {
674 status = -ENOMEM;
675 mlog_errno(status);
676 goto read_super_error;
677 }
678
679 sb->s_root = root;
680
681 ocfs2_complete_mount_recovery(osb);
682
683 if (ocfs2_mount_local(osb))
684 snprintf(nodestr, sizeof(nodestr), "local");
685 else
686 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
687
688 printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
689 "with %s data mode.\n",
690 osb->dev_str, nodestr, osb->slot_num,
691 osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
692 "ordered");
693
694 atomic_set(&osb->vol_state, VOLUME_MOUNTED);
695 wake_up(&osb->osb_mount_event);
696
697 mlog_exit(status);
698 return status;
699
700 read_super_error:
701 if (bh != NULL)
702 brelse(bh);
703
704 if (inode)
705 iput(inode);
706
707 if (osb) {
708 atomic_set(&osb->vol_state, VOLUME_DISABLED);
709 wake_up(&osb->osb_mount_event);
710 ocfs2_dismount_volume(sb, 1);
711 }
712
713 mlog_exit(status);
714 return status;
715 }
716
717 static int ocfs2_get_sb(struct file_system_type *fs_type,
718 int flags,
719 const char *dev_name,
720 void *data,
721 struct vfsmount *mnt)
722 {
723 return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
724 mnt);
725 }
726
727 static struct file_system_type ocfs2_fs_type = {
728 .owner = THIS_MODULE,
729 .name = "ocfs2",
730 .get_sb = ocfs2_get_sb, /* is this called when we mount
731 * the fs? */
732 .kill_sb = kill_block_super, /* set to the generic one
733 * right now, but do we
734 * need to change that? */
735 .fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
736 .next = NULL
737 };
738
739 static int ocfs2_parse_options(struct super_block *sb,
740 char *options,
741 struct mount_options *mopt,
742 int is_remount)
743 {
744 int status;
745 char *p;
746
747 mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
748 options ? options : "(none)");
749
750 mopt->mount_opt = 0;
751 mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
752 mopt->slot = OCFS2_INVALID_SLOT;
753
754 if (!options) {
755 status = 1;
756 goto bail;
757 }
758
759 while ((p = strsep(&options, ",")) != NULL) {
760 int token, option;
761 substring_t args[MAX_OPT_ARGS];
762
763 if (!*p)
764 continue;
765
766 token = match_token(p, tokens, args);
767 switch (token) {
768 case Opt_hb_local:
769 mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
770 break;
771 case Opt_hb_none:
772 mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
773 break;
774 case Opt_barrier:
775 if (match_int(&args[0], &option)) {
776 status = 0;
777 goto bail;
778 }
779 if (option)
780 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
781 else
782 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
783 break;
784 case Opt_intr:
785 mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
786 break;
787 case Opt_nointr:
788 mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
789 break;
790 case Opt_err_panic:
791 mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
792 break;
793 case Opt_err_ro:
794 mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
795 break;
796 case Opt_data_ordered:
797 mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
798 break;
799 case Opt_data_writeback:
800 mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
801 break;
802 case Opt_atime_quantum:
803 if (match_int(&args[0], &option)) {
804 status = 0;
805 goto bail;
806 }
807 if (option >= 0)
808 mopt->atime_quantum = option;
809 break;
810 case Opt_slot:
811 option = 0;
812 if (match_int(&args[0], &option)) {
813 status = 0;
814 goto bail;
815 }
816 if (option)
817 mopt->slot = (s16)option;
818 break;
819 default:
820 mlog(ML_ERROR,
821 "Unrecognized mount option \"%s\" "
822 "or missing value\n", p);
823 status = 0;
824 goto bail;
825 }
826 }
827
828 status = 1;
829
830 bail:
831 mlog_exit(status);
832 return status;
833 }
834
835 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
836 {
837 struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
838 unsigned long opts = osb->s_mount_opt;
839
840 if (opts & OCFS2_MOUNT_HB_LOCAL)
841 seq_printf(s, ",_netdev,heartbeat=local");
842 else
843 seq_printf(s, ",heartbeat=none");
844
845 if (opts & OCFS2_MOUNT_NOINTR)
846 seq_printf(s, ",nointr");
847
848 if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
849 seq_printf(s, ",data=writeback");
850 else
851 seq_printf(s, ",data=ordered");
852
853 if (opts & OCFS2_MOUNT_BARRIER)
854 seq_printf(s, ",barrier=1");
855
856 if (opts & OCFS2_MOUNT_ERRORS_PANIC)
857 seq_printf(s, ",errors=panic");
858 else
859 seq_printf(s, ",errors=remount-ro");
860
861 if (osb->preferred_slot != OCFS2_INVALID_SLOT)
862 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
863
864 if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
865 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
866
867 return 0;
868 }
869
870 static int __init ocfs2_init(void)
871 {
872 int status;
873
874 mlog_entry_void();
875
876 ocfs2_print_version();
877
878 status = init_ocfs2_uptodate_cache();
879 if (status < 0) {
880 mlog_errno(status);
881 goto leave;
882 }
883
884 status = ocfs2_initialize_mem_caches();
885 if (status < 0) {
886 mlog_errno(status);
887 goto leave;
888 }
889
890 ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
891 if (!ocfs2_wq) {
892 status = -ENOMEM;
893 goto leave;
894 }
895
896 ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
897 if (!ocfs2_debugfs_root) {
898 status = -EFAULT;
899 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
900 }
901
902 leave:
903 if (status < 0) {
904 ocfs2_free_mem_caches();
905 exit_ocfs2_uptodate_cache();
906 }
907
908 mlog_exit(status);
909
910 if (status >= 0) {
911 return register_filesystem(&ocfs2_fs_type);
912 } else
913 return -1;
914 }
915
916 static void __exit ocfs2_exit(void)
917 {
918 mlog_entry_void();
919
920 if (ocfs2_wq) {
921 flush_workqueue(ocfs2_wq);
922 destroy_workqueue(ocfs2_wq);
923 }
924
925 debugfs_remove(ocfs2_debugfs_root);
926
927 ocfs2_free_mem_caches();
928
929 unregister_filesystem(&ocfs2_fs_type);
930
931 exit_ocfs2_uptodate_cache();
932
933 mlog_exit_void();
934 }
935
936 static void ocfs2_put_super(struct super_block *sb)
937 {
938 mlog_entry("(0x%p)\n", sb);
939
940 ocfs2_sync_blockdev(sb);
941 ocfs2_dismount_volume(sb, 0);
942
943 mlog_exit_void();
944 }
945
946 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
947 {
948 struct ocfs2_super *osb;
949 u32 numbits, freebits;
950 int status;
951 struct ocfs2_dinode *bm_lock;
952 struct buffer_head *bh = NULL;
953 struct inode *inode = NULL;
954
955 mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
956
957 osb = OCFS2_SB(dentry->d_sb);
958
959 inode = ocfs2_get_system_file_inode(osb,
960 GLOBAL_BITMAP_SYSTEM_INODE,
961 OCFS2_INVALID_SLOT);
962 if (!inode) {
963 mlog(ML_ERROR, "failed to get bitmap inode\n");
964 status = -EIO;
965 goto bail;
966 }
967
968 status = ocfs2_meta_lock(inode, &bh, 0);
969 if (status < 0) {
970 mlog_errno(status);
971 goto bail;
972 }
973
974 bm_lock = (struct ocfs2_dinode *) bh->b_data;
975
976 numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
977 freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
978
979 buf->f_type = OCFS2_SUPER_MAGIC;
980 buf->f_bsize = dentry->d_sb->s_blocksize;
981 buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
982 buf->f_blocks = ((sector_t) numbits) *
983 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
984 buf->f_bfree = ((sector_t) freebits) *
985 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
986 buf->f_bavail = buf->f_bfree;
987 buf->f_files = numbits;
988 buf->f_ffree = freebits;
989
990 brelse(bh);
991
992 ocfs2_meta_unlock(inode, 0);
993 status = 0;
994 bail:
995 if (inode)
996 iput(inode);
997
998 mlog_exit(status);
999
1000 return status;
1001 }
1002
1003 static void ocfs2_inode_init_once(void *data,
1004 struct kmem_cache *cachep,
1005 unsigned long flags)
1006 {
1007 struct ocfs2_inode_info *oi = data;
1008
1009 oi->ip_flags = 0;
1010 oi->ip_open_count = 0;
1011 spin_lock_init(&oi->ip_lock);
1012 ocfs2_extent_map_init(&oi->vfs_inode);
1013 INIT_LIST_HEAD(&oi->ip_io_markers);
1014 oi->ip_created_trans = 0;
1015 oi->ip_last_trans = 0;
1016 oi->ip_dir_start_lookup = 0;
1017
1018 init_rwsem(&oi->ip_alloc_sem);
1019 mutex_init(&oi->ip_io_mutex);
1020
1021 oi->ip_blkno = 0ULL;
1022 oi->ip_clusters = 0;
1023
1024 ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1025 ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
1026 ocfs2_lock_res_init_once(&oi->ip_data_lockres);
1027 ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1028
1029 ocfs2_metadata_cache_init(&oi->vfs_inode);
1030
1031 inode_init_once(&oi->vfs_inode);
1032 }
1033
1034 static int ocfs2_initialize_mem_caches(void)
1035 {
1036 ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1037 sizeof(struct ocfs2_inode_info),
1038 0,
1039 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1040 SLAB_MEM_SPREAD),
1041 ocfs2_inode_init_once);
1042 if (!ocfs2_inode_cachep)
1043 return -ENOMEM;
1044
1045 return 0;
1046 }
1047
1048 static void ocfs2_free_mem_caches(void)
1049 {
1050 if (ocfs2_inode_cachep)
1051 kmem_cache_destroy(ocfs2_inode_cachep);
1052
1053 ocfs2_inode_cachep = NULL;
1054 }
1055
1056 static int ocfs2_get_sector(struct super_block *sb,
1057 struct buffer_head **bh,
1058 int block,
1059 int sect_size)
1060 {
1061 if (!sb_set_blocksize(sb, sect_size)) {
1062 mlog(ML_ERROR, "unable to set blocksize\n");
1063 return -EIO;
1064 }
1065
1066 *bh = sb_getblk(sb, block);
1067 if (!*bh) {
1068 mlog_errno(-EIO);
1069 return -EIO;
1070 }
1071 lock_buffer(*bh);
1072 if (!buffer_dirty(*bh))
1073 clear_buffer_uptodate(*bh);
1074 unlock_buffer(*bh);
1075 ll_rw_block(READ, 1, bh);
1076 wait_on_buffer(*bh);
1077 return 0;
1078 }
1079
1080 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1081 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1082 {
1083 int status;
1084
1085 /* XXX hold a ref on the node while mounte? easy enough, if
1086 * desirable. */
1087 if (ocfs2_mount_local(osb))
1088 osb->node_num = 0;
1089 else
1090 osb->node_num = o2nm_this_node();
1091
1092 if (osb->node_num == O2NM_MAX_NODES) {
1093 mlog(ML_ERROR, "could not find this host's node number\n");
1094 status = -ENOENT;
1095 goto bail;
1096 }
1097
1098 mlog(0, "I am node %d\n", osb->node_num);
1099
1100 status = 0;
1101 bail:
1102 return status;
1103 }
1104
1105 static int ocfs2_mount_volume(struct super_block *sb)
1106 {
1107 int status = 0;
1108 int unlock_super = 0;
1109 struct ocfs2_super *osb = OCFS2_SB(sb);
1110
1111 mlog_entry_void();
1112
1113 if (ocfs2_is_hard_readonly(osb))
1114 goto leave;
1115
1116 status = ocfs2_fill_local_node_info(osb);
1117 if (status < 0) {
1118 mlog_errno(status);
1119 goto leave;
1120 }
1121
1122 status = ocfs2_register_hb_callbacks(osb);
1123 if (status < 0) {
1124 mlog_errno(status);
1125 goto leave;
1126 }
1127
1128 status = ocfs2_dlm_init(osb);
1129 if (status < 0) {
1130 mlog_errno(status);
1131 goto leave;
1132 }
1133
1134 /* requires vote_thread to be running. */
1135 status = ocfs2_register_net_handlers(osb);
1136 if (status < 0) {
1137 mlog_errno(status);
1138 goto leave;
1139 }
1140
1141 status = ocfs2_super_lock(osb, 1);
1142 if (status < 0) {
1143 mlog_errno(status);
1144 goto leave;
1145 }
1146 unlock_super = 1;
1147
1148 /* This will load up the node map and add ourselves to it. */
1149 status = ocfs2_find_slot(osb);
1150 if (status < 0) {
1151 mlog_errno(status);
1152 goto leave;
1153 }
1154
1155 ocfs2_populate_mounted_map(osb);
1156
1157 /* load all node-local system inodes */
1158 status = ocfs2_init_local_system_inodes(osb);
1159 if (status < 0) {
1160 mlog_errno(status);
1161 goto leave;
1162 }
1163
1164 status = ocfs2_check_volume(osb);
1165 if (status < 0) {
1166 mlog_errno(status);
1167 goto leave;
1168 }
1169
1170 status = ocfs2_truncate_log_init(osb);
1171 if (status < 0) {
1172 mlog_errno(status);
1173 goto leave;
1174 }
1175
1176 if (ocfs2_mount_local(osb))
1177 goto leave;
1178
1179 /* This should be sent *after* we recovered our journal as it
1180 * will cause other nodes to unmark us as needing
1181 * recovery. However, we need to send it *before* dropping the
1182 * super block lock as otherwise their recovery threads might
1183 * try to clean us up while we're live! */
1184 status = ocfs2_request_mount_vote(osb);
1185 if (status < 0)
1186 mlog_errno(status);
1187
1188 leave:
1189 if (unlock_super)
1190 ocfs2_super_unlock(osb, 1);
1191
1192 mlog_exit(status);
1193 return status;
1194 }
1195
1196 /* we can't grab the goofy sem lock from inside wait_event, so we use
1197 * memory barriers to make sure that we'll see the null task before
1198 * being woken up */
1199 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1200 {
1201 mb();
1202 return osb->recovery_thread_task != NULL;
1203 }
1204
1205 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1206 {
1207 int tmp;
1208 struct ocfs2_super *osb = NULL;
1209 char nodestr[8];
1210
1211 mlog_entry("(0x%p)\n", sb);
1212
1213 BUG_ON(!sb);
1214 osb = OCFS2_SB(sb);
1215 BUG_ON(!osb);
1216
1217 ocfs2_shutdown_local_alloc(osb);
1218
1219 ocfs2_truncate_log_shutdown(osb);
1220
1221 /* disable any new recovery threads and wait for any currently
1222 * running ones to exit. Do this before setting the vol_state. */
1223 mutex_lock(&osb->recovery_lock);
1224 osb->disable_recovery = 1;
1225 mutex_unlock(&osb->recovery_lock);
1226 wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1227
1228 /* At this point, we know that no more recovery threads can be
1229 * launched, so wait for any recovery completion work to
1230 * complete. */
1231 flush_workqueue(ocfs2_wq);
1232
1233 ocfs2_journal_shutdown(osb);
1234
1235 ocfs2_sync_blockdev(sb);
1236
1237 /* No dlm means we've failed during mount, so skip all the
1238 * steps which depended on that to complete. */
1239 if (osb->dlm) {
1240 tmp = ocfs2_super_lock(osb, 1);
1241 if (tmp < 0) {
1242 mlog_errno(tmp);
1243 return;
1244 }
1245
1246 tmp = ocfs2_request_umount_vote(osb);
1247 if (tmp < 0)
1248 mlog_errno(tmp);
1249 }
1250
1251 if (osb->slot_num != OCFS2_INVALID_SLOT)
1252 ocfs2_put_slot(osb);
1253
1254 if (osb->dlm)
1255 ocfs2_super_unlock(osb, 1);
1256
1257 ocfs2_release_system_inodes(osb);
1258
1259 if (osb->dlm) {
1260 ocfs2_unregister_net_handlers(osb);
1261
1262 ocfs2_dlm_shutdown(osb);
1263 }
1264
1265 ocfs2_clear_hb_callbacks(osb);
1266
1267 debugfs_remove(osb->osb_debug_root);
1268
1269 if (!mnt_err)
1270 ocfs2_stop_heartbeat(osb);
1271
1272 atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1273
1274 if (ocfs2_mount_local(osb))
1275 snprintf(nodestr, sizeof(nodestr), "local");
1276 else
1277 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1278
1279 printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1280 osb->dev_str, nodestr);
1281
1282 ocfs2_delete_osb(osb);
1283 kfree(osb);
1284 sb->s_dev = 0;
1285 sb->s_fs_info = NULL;
1286 }
1287
1288 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1289 unsigned uuid_bytes)
1290 {
1291 int i, ret;
1292 char *ptr;
1293
1294 BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1295
1296 osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1297 if (osb->uuid_str == NULL)
1298 return -ENOMEM;
1299
1300 for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1301 /* print with null */
1302 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1303 if (ret != 2) /* drop super cleans up */
1304 return -EINVAL;
1305 /* then only advance past the last char */
1306 ptr += 2;
1307 }
1308
1309 return 0;
1310 }
1311
1312 static int ocfs2_initialize_super(struct super_block *sb,
1313 struct buffer_head *bh,
1314 int sector_size)
1315 {
1316 int status;
1317 int i, cbits, bbits;
1318 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1319 struct inode *inode = NULL;
1320 struct buffer_head *bitmap_bh = NULL;
1321 struct ocfs2_journal *journal;
1322 __le32 uuid_net_key;
1323 struct ocfs2_super *osb;
1324
1325 mlog_entry_void();
1326
1327 osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1328 if (!osb) {
1329 status = -ENOMEM;
1330 mlog_errno(status);
1331 goto bail;
1332 }
1333
1334 sb->s_fs_info = osb;
1335 sb->s_op = &ocfs2_sops;
1336 sb->s_export_op = &ocfs2_export_ops;
1337 sb->s_time_gran = 1;
1338 sb->s_flags |= MS_NOATIME;
1339 /* this is needed to support O_LARGEFILE */
1340 cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1341 bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1342 sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1343
1344 osb->sb = sb;
1345 /* Save off for ocfs2_rw_direct */
1346 osb->s_sectsize_bits = blksize_bits(sector_size);
1347 BUG_ON(!osb->s_sectsize_bits);
1348
1349 osb->net_response_ids = 0;
1350 spin_lock_init(&osb->net_response_lock);
1351 INIT_LIST_HEAD(&osb->net_response_list);
1352
1353 INIT_LIST_HEAD(&osb->osb_net_handlers);
1354 init_waitqueue_head(&osb->recovery_event);
1355 spin_lock_init(&osb->vote_task_lock);
1356 init_waitqueue_head(&osb->vote_event);
1357 osb->vote_work_sequence = 0;
1358 osb->vote_wake_sequence = 0;
1359 INIT_LIST_HEAD(&osb->blocked_lock_list);
1360 osb->blocked_lock_count = 0;
1361 INIT_LIST_HEAD(&osb->vote_list);
1362 spin_lock_init(&osb->osb_lock);
1363
1364 atomic_set(&osb->alloc_stats.moves, 0);
1365 atomic_set(&osb->alloc_stats.local_data, 0);
1366 atomic_set(&osb->alloc_stats.bitmap_data, 0);
1367 atomic_set(&osb->alloc_stats.bg_allocs, 0);
1368 atomic_set(&osb->alloc_stats.bg_extends, 0);
1369
1370 ocfs2_init_node_maps(osb);
1371
1372 snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1373 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1374
1375 mutex_init(&osb->recovery_lock);
1376
1377 osb->disable_recovery = 0;
1378 osb->recovery_thread_task = NULL;
1379
1380 init_waitqueue_head(&osb->checkpoint_event);
1381 atomic_set(&osb->needs_checkpoint, 0);
1382
1383 osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1384
1385 osb->node_num = O2NM_INVALID_NODE_NUM;
1386 osb->slot_num = OCFS2_INVALID_SLOT;
1387
1388 osb->local_alloc_state = OCFS2_LA_UNUSED;
1389 osb->local_alloc_bh = NULL;
1390
1391 ocfs2_setup_hb_callbacks(osb);
1392
1393 init_waitqueue_head(&osb->osb_mount_event);
1394
1395 osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1396 if (!osb->vol_label) {
1397 mlog(ML_ERROR, "unable to alloc vol label\n");
1398 status = -ENOMEM;
1399 goto bail;
1400 }
1401
1402 osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1403 if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1404 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1405 osb->max_slots);
1406 status = -EINVAL;
1407 goto bail;
1408 }
1409 mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1410
1411 init_waitqueue_head(&osb->osb_wipe_event);
1412 osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1413 sizeof(*osb->osb_orphan_wipes),
1414 GFP_KERNEL);
1415 if (!osb->osb_orphan_wipes) {
1416 status = -ENOMEM;
1417 mlog_errno(status);
1418 goto bail;
1419 }
1420
1421 osb->s_feature_compat =
1422 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1423 osb->s_feature_ro_compat =
1424 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1425 osb->s_feature_incompat =
1426 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1427
1428 if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1429 mlog(ML_ERROR, "couldn't mount because of unsupported "
1430 "optional features (%x).\n", i);
1431 status = -EINVAL;
1432 goto bail;
1433 }
1434 if (!(osb->sb->s_flags & MS_RDONLY) &&
1435 (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1436 mlog(ML_ERROR, "couldn't mount RDWR because of "
1437 "unsupported optional features (%x).\n", i);
1438 status = -EINVAL;
1439 goto bail;
1440 }
1441
1442 get_random_bytes(&osb->s_next_generation, sizeof(u32));
1443
1444 /* FIXME
1445 * This should be done in ocfs2_journal_init(), but unknown
1446 * ordering issues will cause the filesystem to crash.
1447 * If anyone wants to figure out what part of the code
1448 * refers to osb->journal before ocfs2_journal_init() is run,
1449 * be my guest.
1450 */
1451 /* initialize our journal structure */
1452
1453 journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1454 if (!journal) {
1455 mlog(ML_ERROR, "unable to alloc journal\n");
1456 status = -ENOMEM;
1457 goto bail;
1458 }
1459 osb->journal = journal;
1460 journal->j_osb = osb;
1461
1462 atomic_set(&journal->j_num_trans, 0);
1463 init_rwsem(&journal->j_trans_barrier);
1464 init_waitqueue_head(&journal->j_checkpointed);
1465 spin_lock_init(&journal->j_lock);
1466 journal->j_trans_id = (unsigned long) 1;
1467 INIT_LIST_HEAD(&journal->j_la_cleanups);
1468 INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1469 journal->j_state = OCFS2_JOURNAL_FREE;
1470
1471 /* get some pseudo constants for clustersize bits */
1472 osb->s_clustersize_bits =
1473 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1474 osb->s_clustersize = 1 << osb->s_clustersize_bits;
1475 mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1476
1477 if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1478 osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1479 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1480 osb->s_clustersize);
1481 status = -EINVAL;
1482 goto bail;
1483 }
1484
1485 if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1486 > (u32)~0UL) {
1487 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1488 "what jbd can address in 32 bits.\n");
1489 status = -EINVAL;
1490 goto bail;
1491 }
1492
1493 if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1494 sizeof(di->id2.i_super.s_uuid))) {
1495 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1496 status = -ENOMEM;
1497 goto bail;
1498 }
1499
1500 memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1501 osb->net_key = le32_to_cpu(uuid_net_key);
1502
1503 strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1504 osb->vol_label[63] = '\0';
1505 osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1506 osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1507 osb->first_cluster_group_blkno =
1508 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1509 osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1510 mlog(0, "vol_label: %s\n", osb->vol_label);
1511 mlog(0, "uuid: %s\n", osb->uuid_str);
1512 mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1513 (unsigned long long)osb->root_blkno,
1514 (unsigned long long)osb->system_dir_blkno);
1515
1516 osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1517 if (!osb->osb_dlm_debug) {
1518 status = -ENOMEM;
1519 mlog_errno(status);
1520 goto bail;
1521 }
1522
1523 atomic_set(&osb->vol_state, VOLUME_INIT);
1524
1525 /* load root, system_dir, and all global system inodes */
1526 status = ocfs2_init_global_system_inodes(osb);
1527 if (status < 0) {
1528 mlog_errno(status);
1529 goto bail;
1530 }
1531
1532 /*
1533 * global bitmap
1534 */
1535 inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1536 OCFS2_INVALID_SLOT);
1537 if (!inode) {
1538 status = -EINVAL;
1539 mlog_errno(status);
1540 goto bail;
1541 }
1542
1543 osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1544
1545 /* We don't have a cluster lock on the bitmap here because
1546 * we're only interested in static information and the extra
1547 * complexity at mount time isn't worht it. Don't pass the
1548 * inode in to the read function though as we don't want it to
1549 * be put in the cache. */
1550 status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1551 NULL);
1552 iput(inode);
1553 if (status < 0) {
1554 mlog_errno(status);
1555 goto bail;
1556 }
1557
1558 di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1559 osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1560 brelse(bitmap_bh);
1561 mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1562 (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1563
1564 status = ocfs2_init_slot_info(osb);
1565 if (status < 0) {
1566 mlog_errno(status);
1567 goto bail;
1568 }
1569
1570 bail:
1571 mlog_exit(status);
1572 return status;
1573 }
1574
1575 /*
1576 * will return: -EAGAIN if it is ok to keep searching for superblocks
1577 * -EINVAL if there is a bad superblock
1578 * 0 on success
1579 */
1580 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1581 struct buffer_head *bh,
1582 u32 blksz)
1583 {
1584 int status = -EAGAIN;
1585
1586 mlog_entry_void();
1587
1588 if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1589 strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1590 status = -EINVAL;
1591 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1592 mlog(ML_ERROR, "found superblock with incorrect block "
1593 "size: found %u, should be %u\n",
1594 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1595 blksz);
1596 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1597 OCFS2_MAJOR_REV_LEVEL ||
1598 le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1599 OCFS2_MINOR_REV_LEVEL) {
1600 mlog(ML_ERROR, "found superblock with bad version: "
1601 "found %u.%u, should be %u.%u\n",
1602 le16_to_cpu(di->id2.i_super.s_major_rev_level),
1603 le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1604 OCFS2_MAJOR_REV_LEVEL,
1605 OCFS2_MINOR_REV_LEVEL);
1606 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1607 mlog(ML_ERROR, "bad block number on superblock: "
1608 "found %llu, should be %llu\n",
1609 (unsigned long long)le64_to_cpu(di->i_blkno),
1610 (unsigned long long)bh->b_blocknr);
1611 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1612 le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1613 mlog(ML_ERROR, "bad cluster size found: %u\n",
1614 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1615 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1616 mlog(ML_ERROR, "bad root_blkno: 0\n");
1617 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1618 mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1619 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1620 mlog(ML_ERROR,
1621 "Superblock slots found greater than file system "
1622 "maximum: found %u, max %u\n",
1623 le16_to_cpu(di->id2.i_super.s_max_slots),
1624 OCFS2_MAX_SLOTS);
1625 } else {
1626 /* found it! */
1627 status = 0;
1628 }
1629 }
1630
1631 mlog_exit(status);
1632 return status;
1633 }
1634
1635 static int ocfs2_check_volume(struct ocfs2_super *osb)
1636 {
1637 int status;
1638 int dirty;
1639 int local;
1640 struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1641 * recover
1642 * ourselves. */
1643
1644 mlog_entry_void();
1645
1646 /* Init our journal object. */
1647 status = ocfs2_journal_init(osb->journal, &dirty);
1648 if (status < 0) {
1649 mlog(ML_ERROR, "Could not initialize journal!\n");
1650 goto finally;
1651 }
1652
1653 /* If the journal was unmounted cleanly then we don't want to
1654 * recover anything. Otherwise, journal_load will do that
1655 * dirty work for us :) */
1656 if (!dirty) {
1657 status = ocfs2_journal_wipe(osb->journal, 0);
1658 if (status < 0) {
1659 mlog_errno(status);
1660 goto finally;
1661 }
1662 } else {
1663 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1664 "recovering volume.\n");
1665 }
1666
1667 local = ocfs2_mount_local(osb);
1668
1669 /* will play back anything left in the journal. */
1670 ocfs2_journal_load(osb->journal, local);
1671
1672 if (dirty) {
1673 /* recover my local alloc if we didn't unmount cleanly. */
1674 status = ocfs2_begin_local_alloc_recovery(osb,
1675 osb->slot_num,
1676 &local_alloc);
1677 if (status < 0) {
1678 mlog_errno(status);
1679 goto finally;
1680 }
1681 /* we complete the recovery process after we've marked
1682 * ourselves as mounted. */
1683 }
1684
1685 mlog(0, "Journal loaded.\n");
1686
1687 status = ocfs2_load_local_alloc(osb);
1688 if (status < 0) {
1689 mlog_errno(status);
1690 goto finally;
1691 }
1692
1693 if (dirty) {
1694 /* Recovery will be completed after we've mounted the
1695 * rest of the volume. */
1696 osb->dirty = 1;
1697 osb->local_alloc_copy = local_alloc;
1698 local_alloc = NULL;
1699 }
1700
1701 /* go through each journal, trylock it and if you get the
1702 * lock, and it's marked as dirty, set the bit in the recover
1703 * map and launch a recovery thread for it. */
1704 status = ocfs2_mark_dead_nodes(osb);
1705 if (status < 0)
1706 mlog_errno(status);
1707
1708 finally:
1709 if (local_alloc)
1710 kfree(local_alloc);
1711
1712 mlog_exit(status);
1713 return status;
1714 }
1715
1716 /*
1717 * The routine gets called from dismount or close whenever a dismount on
1718 * volume is requested and the osb open count becomes 1.
1719 * It will remove the osb from the global list and also free up all the
1720 * initialized resources and fileobject.
1721 */
1722 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1723 {
1724 mlog_entry_void();
1725
1726 /* This function assumes that the caller has the main osb resource */
1727
1728 if (osb->slot_info)
1729 ocfs2_free_slot_info(osb->slot_info);
1730
1731 kfree(osb->osb_orphan_wipes);
1732 /* FIXME
1733 * This belongs in journal shutdown, but because we have to
1734 * allocate osb->journal at the start of ocfs2_initalize_osb(),
1735 * we free it here.
1736 */
1737 kfree(osb->journal);
1738 if (osb->local_alloc_copy)
1739 kfree(osb->local_alloc_copy);
1740 kfree(osb->uuid_str);
1741 ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1742 memset(osb, 0, sizeof(struct ocfs2_super));
1743
1744 mlog_exit_void();
1745 }
1746
1747 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1748 * panic(). We do not support continue-on-error operation. */
1749 static void ocfs2_handle_error(struct super_block *sb)
1750 {
1751 struct ocfs2_super *osb = OCFS2_SB(sb);
1752
1753 if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1754 panic("OCFS2: (device %s): panic forced after error\n",
1755 sb->s_id);
1756
1757 ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1758
1759 if (sb->s_flags & MS_RDONLY &&
1760 (ocfs2_is_soft_readonly(osb) ||
1761 ocfs2_is_hard_readonly(osb)))
1762 return;
1763
1764 printk(KERN_CRIT "File system is now read-only due to the potential "
1765 "of on-disk corruption. Please run fsck.ocfs2 once the file "
1766 "system is unmounted.\n");
1767 sb->s_flags |= MS_RDONLY;
1768 ocfs2_set_ro_flag(osb, 0);
1769 }
1770
1771 static char error_buf[1024];
1772
1773 void __ocfs2_error(struct super_block *sb,
1774 const char *function,
1775 const char *fmt, ...)
1776 {
1777 va_list args;
1778
1779 va_start(args, fmt);
1780 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1781 va_end(args);
1782
1783 /* Not using mlog here because we want to show the actual
1784 * function the error came from. */
1785 printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1786 sb->s_id, function, error_buf);
1787
1788 ocfs2_handle_error(sb);
1789 }
1790
1791 /* Handle critical errors. This is intentionally more drastic than
1792 * ocfs2_handle_error, so we only use for things like journal errors,
1793 * etc. */
1794 void __ocfs2_abort(struct super_block* sb,
1795 const char *function,
1796 const char *fmt, ...)
1797 {
1798 va_list args;
1799
1800 va_start(args, fmt);
1801 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1802 va_end(args);
1803
1804 printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1805 sb->s_id, function, error_buf);
1806
1807 /* We don't have the cluster support yet to go straight to
1808 * hard readonly in here. Until then, we want to keep
1809 * ocfs2_abort() so that we can at least mark critical
1810 * errors.
1811 *
1812 * TODO: This should abort the journal and alert other nodes
1813 * that our slot needs recovery. */
1814
1815 /* Force a panic(). This stinks, but it's better than letting
1816 * things continue without having a proper hard readonly
1817 * here. */
1818 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1819 ocfs2_handle_error(sb);
1820 }
1821
1822 module_init(ocfs2_init);
1823 module_exit(ocfs2_exit);
WRT350N Kernel Patches