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[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
[deliverable/linux.git] / fs / ocfs2 / super.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * super.c
5 *
6 * load/unload driver, mount/dismount volumes
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
26 #include <linux/module.h>
27 #include <linux/fs.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/utsname.h>
32 #include <linux/init.h>
33 #include <linux/random.h>
34 #include <linux/statfs.h>
35 #include <linux/moduleparam.h>
36 #include <linux/blkdev.h>
37 #include <linux/socket.h>
38 #include <linux/inet.h>
39 #include <linux/parser.h>
40 #include <linux/crc32.h>
41 #include <linux/debugfs.h>
42
43 #include <cluster/nodemanager.h>
44
45 #define MLOG_MASK_PREFIX ML_SUPER
46 #include <cluster/masklog.h>
47
48 #include "ocfs2.h"
49
50 /* this should be the only file to include a version 1 header */
51 #include "ocfs1_fs_compat.h"
52
53 #include "alloc.h"
54 #include "dlmglue.h"
55 #include "export.h"
56 #include "extent_map.h"
57 #include "heartbeat.h"
58 #include "inode.h"
59 #include "journal.h"
60 #include "localalloc.h"
61 #include "namei.h"
62 #include "slot_map.h"
63 #include "super.h"
64 #include "sysfile.h"
65 #include "uptodate.h"
66 #include "ver.h"
67 #include "vote.h"
68
69 #include "buffer_head_io.h"
70
71 /*
72 * Globals
73 */
74 static spinlock_t ocfs2_globals_lock = SPIN_LOCK_UNLOCKED;
75
76 static u32 osb_id; /* Keeps track of next available OSB Id */
77
78 static kmem_cache_t *ocfs2_inode_cachep = NULL;
79
80 kmem_cache_t *ocfs2_lock_cache = NULL;
81
82 /* OCFS2 needs to schedule several differnt types of work which
83 * require cluster locking, disk I/O, recovery waits, etc. Since these
84 * types of work tend to be heavy we avoid using the kernel events
85 * workqueue and schedule on our own. */
86 struct workqueue_struct *ocfs2_wq = NULL;
87
88 static struct dentry *ocfs2_debugfs_root = NULL;
89
90 MODULE_AUTHOR("Oracle");
91 MODULE_LICENSE("GPL");
92
93 static int ocfs2_parse_options(struct super_block *sb, char *options,
94 unsigned long *mount_opt, int is_remount);
95 static void ocfs2_put_super(struct super_block *sb);
96 static int ocfs2_mount_volume(struct super_block *sb);
97 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
98 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
99 static int ocfs2_initialize_mem_caches(void);
100 static void ocfs2_free_mem_caches(void);
101 static void ocfs2_delete_osb(struct ocfs2_super *osb);
102
103 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
104
105 static int ocfs2_sync_fs(struct super_block *sb, int wait);
106
107 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
108 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
109 static int ocfs2_release_system_inodes(struct ocfs2_super *osb);
110 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb);
111 static int ocfs2_check_volume(struct ocfs2_super *osb);
112 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
113 struct buffer_head *bh,
114 u32 sectsize);
115 static int ocfs2_initialize_super(struct super_block *sb,
116 struct buffer_head *bh,
117 int sector_size);
118 static int ocfs2_get_sector(struct super_block *sb,
119 struct buffer_head **bh,
120 int block,
121 int sect_size);
122 static void ocfs2_write_super(struct super_block *sb);
123 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
124 static void ocfs2_destroy_inode(struct inode *inode);
125
126 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift);
127
128 static 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 };
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_err,
152 };
153
154 static match_table_t tokens = {
155 {Opt_barrier, "barrier=%u"},
156 {Opt_err_panic, "errors=panic"},
157 {Opt_err_ro, "errors=remount-ro"},
158 {Opt_intr, "intr"},
159 {Opt_nointr, "nointr"},
160 {Opt_hb_none, OCFS2_HB_NONE},
161 {Opt_hb_local, OCFS2_HB_LOCAL},
162 {Opt_data_ordered, "data=ordered"},
163 {Opt_data_writeback, "data=writeback"},
164 {Opt_err, NULL}
165 };
166
167 /*
168 * write_super and sync_fs ripped right out of ext3.
169 */
170 static void ocfs2_write_super(struct super_block *sb)
171 {
172 if (mutex_trylock(&sb->s_lock) != 0)
173 BUG();
174 sb->s_dirt = 0;
175 }
176
177 static int ocfs2_sync_fs(struct super_block *sb, int wait)
178 {
179 int status = 0;
180 tid_t target;
181 struct ocfs2_super *osb = OCFS2_SB(sb);
182
183 sb->s_dirt = 0;
184
185 if (ocfs2_is_hard_readonly(osb))
186 return -EROFS;
187
188 if (wait) {
189 status = ocfs2_flush_truncate_log(osb);
190 if (status < 0)
191 mlog_errno(status);
192 } else {
193 ocfs2_schedule_truncate_log_flush(osb, 0);
194 }
195
196 if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
197 if (wait)
198 log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
199 target);
200 }
201 return 0;
202 }
203
204 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
205 {
206 struct inode *new = NULL;
207 int status = 0;
208 int i;
209
210 mlog_entry_void();
211
212 new = ocfs2_iget(osb, osb->root_blkno);
213 if (IS_ERR(new)) {
214 status = PTR_ERR(new);
215 mlog_errno(status);
216 goto bail;
217 }
218 osb->root_inode = new;
219
220 new = ocfs2_iget(osb, osb->system_dir_blkno);
221 if (IS_ERR(new)) {
222 status = PTR_ERR(new);
223 mlog_errno(status);
224 goto bail;
225 }
226 osb->sys_root_inode = new;
227
228 for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
229 i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
230 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
231 if (!new) {
232 ocfs2_release_system_inodes(osb);
233 status = -EINVAL;
234 mlog_errno(status);
235 /* FIXME: Should ERROR_RO_FS */
236 mlog(ML_ERROR, "Unable to load system inode %d, "
237 "possibly corrupt fs?", i);
238 goto bail;
239 }
240 // the array now has one ref, so drop this one
241 iput(new);
242 }
243
244 bail:
245 mlog_exit(status);
246 return status;
247 }
248
249 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
250 {
251 struct inode *new = NULL;
252 int status = 0;
253 int i;
254
255 mlog_entry_void();
256
257 for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
258 i < NUM_SYSTEM_INODES;
259 i++) {
260 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
261 if (!new) {
262 ocfs2_release_system_inodes(osb);
263 status = -EINVAL;
264 mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
265 status, i, osb->slot_num);
266 goto bail;
267 }
268 /* the array now has one ref, so drop this one */
269 iput(new);
270 }
271
272 bail:
273 mlog_exit(status);
274 return status;
275 }
276
277 static int ocfs2_release_system_inodes(struct ocfs2_super *osb)
278 {
279 int status = 0, i;
280 struct inode *inode;
281
282 mlog_entry_void();
283
284 for (i = 0; i < NUM_SYSTEM_INODES; i++) {
285 inode = osb->system_inodes[i];
286 if (inode) {
287 iput(inode);
288 osb->system_inodes[i] = NULL;
289 }
290 }
291
292 inode = osb->sys_root_inode;
293 if (inode) {
294 iput(inode);
295 osb->sys_root_inode = NULL;
296 }
297
298 inode = osb->root_inode;
299 if (inode) {
300 iput(inode);
301 osb->root_inode = NULL;
302 }
303
304 mlog_exit(status);
305 return status;
306 }
307
308 /* We're allocating fs objects, use GFP_NOFS */
309 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
310 {
311 struct ocfs2_inode_info *oi;
312
313 oi = kmem_cache_alloc(ocfs2_inode_cachep, SLAB_NOFS);
314 if (!oi)
315 return NULL;
316
317 return &oi->vfs_inode;
318 }
319
320 static void ocfs2_destroy_inode(struct inode *inode)
321 {
322 kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
323 }
324
325 /* From xfs_super.c:xfs_max_file_offset
326 * Copyright (c) 2000-2004 Silicon Graphics, Inc.
327 */
328 static unsigned long long ocfs2_max_file_offset(unsigned int blockshift)
329 {
330 unsigned int pagefactor = 1;
331 unsigned int bitshift = BITS_PER_LONG - 1;
332
333 /* Figure out maximum filesize, on Linux this can depend on
334 * the filesystem blocksize (on 32 bit platforms).
335 * __block_prepare_write does this in an [unsigned] long...
336 * page->index << (PAGE_CACHE_SHIFT - bbits)
337 * So, for page sized blocks (4K on 32 bit platforms),
338 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
339 * (((u64)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1)
340 * but for smaller blocksizes it is less (bbits = log2 bsize).
341 * Note1: get_block_t takes a long (implicit cast from above)
342 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
343 * can optionally convert the [unsigned] long from above into
344 * an [unsigned] long long.
345 */
346
347 #if BITS_PER_LONG == 32
348 # if defined(CONFIG_LBD)
349 BUG_ON(sizeof(sector_t) != 8);
350 pagefactor = PAGE_CACHE_SIZE;
351 bitshift = BITS_PER_LONG;
352 # else
353 pagefactor = PAGE_CACHE_SIZE >> (PAGE_CACHE_SHIFT - blockshift);
354 # endif
355 #endif
356
357 return (((unsigned long long)pagefactor) << bitshift) - 1;
358 }
359
360 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
361 {
362 int incompat_features;
363 int ret = 0;
364 unsigned long parsed_options;
365 struct ocfs2_super *osb = OCFS2_SB(sb);
366
367 if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
368 ret = -EINVAL;
369 goto out;
370 }
371
372 if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
373 (parsed_options & OCFS2_MOUNT_HB_LOCAL)) {
374 ret = -EINVAL;
375 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
376 goto out;
377 }
378
379 if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
380 (parsed_options & OCFS2_MOUNT_DATA_WRITEBACK)) {
381 ret = -EINVAL;
382 mlog(ML_ERROR, "Cannot change data mode on remount\n");
383 goto out;
384 }
385
386 /* We're going to/from readonly mode. */
387 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
388 /* Lock here so the check of HARD_RO and the potential
389 * setting of SOFT_RO is atomic. */
390 spin_lock(&osb->osb_lock);
391 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
392 mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
393 ret = -EROFS;
394 goto unlock_osb;
395 }
396
397 if (*flags & MS_RDONLY) {
398 mlog(0, "Going to ro mode.\n");
399 sb->s_flags |= MS_RDONLY;
400 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
401 } else {
402 mlog(0, "Making ro filesystem writeable.\n");
403
404 if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
405 mlog(ML_ERROR, "Cannot remount RDWR "
406 "filesystem due to previous errors.\n");
407 ret = -EROFS;
408 goto unlock_osb;
409 }
410 incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
411 if (incompat_features) {
412 mlog(ML_ERROR, "Cannot remount RDWR because "
413 "of unsupported optional features "
414 "(%x).\n", incompat_features);
415 ret = -EINVAL;
416 goto unlock_osb;
417 }
418 sb->s_flags &= ~MS_RDONLY;
419 osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
420 }
421 unlock_osb:
422 spin_unlock(&osb->osb_lock);
423 }
424
425 if (!ret) {
426 if (!ocfs2_is_hard_readonly(osb))
427 ocfs2_set_journal_params(osb);
428
429 /* Only save off the new mount options in case of a successful
430 * remount. */
431 osb->s_mount_opt = parsed_options;
432 }
433 out:
434 return ret;
435 }
436
437 static int ocfs2_sb_probe(struct super_block *sb,
438 struct buffer_head **bh,
439 int *sector_size)
440 {
441 int status = 0, tmpstat;
442 struct ocfs1_vol_disk_hdr *hdr;
443 struct ocfs2_dinode *di;
444 int blksize;
445
446 *bh = NULL;
447
448 /* may be > 512 */
449 *sector_size = bdev_hardsect_size(sb->s_bdev);
450 if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
451 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
452 *sector_size, OCFS2_MAX_BLOCKSIZE);
453 status = -EINVAL;
454 goto bail;
455 }
456
457 /* Can this really happen? */
458 if (*sector_size < OCFS2_MIN_BLOCKSIZE)
459 *sector_size = OCFS2_MIN_BLOCKSIZE;
460
461 /* check block zero for old format */
462 status = ocfs2_get_sector(sb, bh, 0, *sector_size);
463 if (status < 0) {
464 mlog_errno(status);
465 goto bail;
466 }
467 hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
468 if (hdr->major_version == OCFS1_MAJOR_VERSION) {
469 mlog(ML_ERROR, "incompatible version: %u.%u\n",
470 hdr->major_version, hdr->minor_version);
471 status = -EINVAL;
472 }
473 if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
474 strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
475 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
476 hdr->signature);
477 status = -EINVAL;
478 }
479 brelse(*bh);
480 *bh = NULL;
481 if (status < 0) {
482 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
483 "upgraded before mounting with ocfs v2\n");
484 goto bail;
485 }
486
487 /*
488 * Now check at magic offset for 512, 1024, 2048, 4096
489 * blocksizes. 4096 is the maximum blocksize because it is
490 * the minimum clustersize.
491 */
492 status = -EINVAL;
493 for (blksize = *sector_size;
494 blksize <= OCFS2_MAX_BLOCKSIZE;
495 blksize <<= 1) {
496 tmpstat = ocfs2_get_sector(sb, bh,
497 OCFS2_SUPER_BLOCK_BLKNO,
498 blksize);
499 if (tmpstat < 0) {
500 status = tmpstat;
501 mlog_errno(status);
502 goto bail;
503 }
504 di = (struct ocfs2_dinode *) (*bh)->b_data;
505 status = ocfs2_verify_volume(di, *bh, blksize);
506 if (status >= 0)
507 goto bail;
508 brelse(*bh);
509 *bh = NULL;
510 if (status != -EAGAIN)
511 break;
512 }
513
514 bail:
515 return status;
516 }
517
518 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
519 {
520 struct dentry *root;
521 int status, sector_size;
522 unsigned long parsed_opt;
523 struct inode *inode = NULL;
524 struct ocfs2_super *osb = NULL;
525 struct buffer_head *bh = NULL;
526
527 mlog_entry("%p, %p, %i", sb, data, silent);
528
529 /* for now we only have one cluster/node, make sure we see it
530 * in the heartbeat universe */
531 if (!o2hb_check_local_node_heartbeating()) {
532 status = -EINVAL;
533 goto read_super_error;
534 }
535
536 /* probe for superblock */
537 status = ocfs2_sb_probe(sb, &bh, &sector_size);
538 if (status < 0) {
539 mlog(ML_ERROR, "superblock probe failed!\n");
540 goto read_super_error;
541 }
542
543 status = ocfs2_initialize_super(sb, bh, sector_size);
544 osb = OCFS2_SB(sb);
545 if (status < 0) {
546 mlog_errno(status);
547 goto read_super_error;
548 }
549 brelse(bh);
550 bh = NULL;
551
552 if (!ocfs2_parse_options(sb, data, &parsed_opt, 0)) {
553 status = -EINVAL;
554 goto read_super_error;
555 }
556 osb->s_mount_opt = parsed_opt;
557
558 sb->s_magic = OCFS2_SUPER_MAGIC;
559
560 /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
561 * heartbeat=none */
562 if (bdev_read_only(sb->s_bdev)) {
563 if (!(sb->s_flags & MS_RDONLY)) {
564 status = -EACCES;
565 mlog(ML_ERROR, "Readonly device detected but readonly "
566 "mount was not specified.\n");
567 goto read_super_error;
568 }
569
570 /* You should not be able to start a local heartbeat
571 * on a readonly device. */
572 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
573 status = -EROFS;
574 mlog(ML_ERROR, "Local heartbeat specified on readonly "
575 "device.\n");
576 goto read_super_error;
577 }
578
579 status = ocfs2_check_journals_nolocks(osb);
580 if (status < 0) {
581 if (status == -EROFS)
582 mlog(ML_ERROR, "Recovery required on readonly "
583 "file system, but write access is "
584 "unavailable.\n");
585 else
586 mlog_errno(status);
587 goto read_super_error;
588 }
589
590 ocfs2_set_ro_flag(osb, 1);
591
592 printk(KERN_NOTICE "Readonly device detected. No cluster "
593 "services will be utilized for this mount. Recovery "
594 "will be skipped.\n");
595 }
596
597 if (!ocfs2_is_hard_readonly(osb)) {
598 /* If this isn't a hard readonly mount, then we need
599 * to make sure that heartbeat is in a valid state,
600 * and that we mark ourselves soft readonly is -oro
601 * was specified. */
602 if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
603 mlog(ML_ERROR, "No heartbeat for device (%s)\n",
604 sb->s_id);
605 status = -EINVAL;
606 goto read_super_error;
607 }
608
609 if (sb->s_flags & MS_RDONLY)
610 ocfs2_set_ro_flag(osb, 0);
611 }
612
613 osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
614 ocfs2_debugfs_root);
615 if (!osb->osb_debug_root) {
616 status = -EINVAL;
617 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
618 goto read_super_error;
619 }
620
621 status = ocfs2_mount_volume(sb);
622 if (osb->root_inode)
623 inode = igrab(osb->root_inode);
624
625 if (status < 0)
626 goto read_super_error;
627
628 if (!inode) {
629 status = -EIO;
630 mlog_errno(status);
631 goto read_super_error;
632 }
633
634 root = d_alloc_root(inode);
635 if (!root) {
636 status = -ENOMEM;
637 mlog_errno(status);
638 goto read_super_error;
639 }
640
641 sb->s_root = root;
642
643 ocfs2_complete_mount_recovery(osb);
644
645 printk("ocfs2: Mounting device (%u,%u) on (node %d, slot %d) with %s "
646 "data mode.\n",
647 MAJOR(sb->s_dev), MINOR(sb->s_dev), osb->node_num,
648 osb->slot_num,
649 osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
650 "ordered");
651
652 atomic_set(&osb->vol_state, VOLUME_MOUNTED);
653 wake_up(&osb->osb_mount_event);
654
655 mlog_exit(status);
656 return status;
657
658 read_super_error:
659 if (bh != NULL)
660 brelse(bh);
661
662 if (inode)
663 iput(inode);
664
665 if (osb) {
666 atomic_set(&osb->vol_state, VOLUME_DISABLED);
667 wake_up(&osb->osb_mount_event);
668 ocfs2_dismount_volume(sb, 1);
669 }
670
671 mlog_exit(status);
672 return status;
673 }
674
675 static int ocfs2_get_sb(struct file_system_type *fs_type,
676 int flags,
677 const char *dev_name,
678 void *data,
679 struct vfsmount *mnt)
680 {
681 return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
682 mnt);
683 }
684
685 static struct file_system_type ocfs2_fs_type = {
686 .owner = THIS_MODULE,
687 .name = "ocfs2",
688 .get_sb = ocfs2_get_sb, /* is this called when we mount
689 * the fs? */
690 .kill_sb = kill_block_super, /* set to the generic one
691 * right now, but do we
692 * need to change that? */
693 .fs_flags = FS_REQUIRES_DEV,
694 .next = NULL
695 };
696
697 static int ocfs2_parse_options(struct super_block *sb,
698 char *options,
699 unsigned long *mount_opt,
700 int is_remount)
701 {
702 int status;
703 char *p;
704
705 mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
706 options ? options : "(none)");
707
708 *mount_opt = 0;
709
710 if (!options) {
711 status = 1;
712 goto bail;
713 }
714
715 while ((p = strsep(&options, ",")) != NULL) {
716 int token, option;
717 substring_t args[MAX_OPT_ARGS];
718
719 if (!*p)
720 continue;
721
722 token = match_token(p, tokens, args);
723 switch (token) {
724 case Opt_hb_local:
725 *mount_opt |= OCFS2_MOUNT_HB_LOCAL;
726 break;
727 case Opt_hb_none:
728 *mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
729 break;
730 case Opt_barrier:
731 if (match_int(&args[0], &option)) {
732 status = 0;
733 goto bail;
734 }
735 if (option)
736 *mount_opt |= OCFS2_MOUNT_BARRIER;
737 else
738 *mount_opt &= ~OCFS2_MOUNT_BARRIER;
739 break;
740 case Opt_intr:
741 *mount_opt &= ~OCFS2_MOUNT_NOINTR;
742 break;
743 case Opt_nointr:
744 *mount_opt |= OCFS2_MOUNT_NOINTR;
745 break;
746 case Opt_err_panic:
747 *mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
748 break;
749 case Opt_err_ro:
750 *mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
751 break;
752 case Opt_data_ordered:
753 *mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
754 break;
755 case Opt_data_writeback:
756 *mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
757 break;
758 default:
759 mlog(ML_ERROR,
760 "Unrecognized mount option \"%s\" "
761 "or missing value\n", p);
762 status = 0;
763 goto bail;
764 }
765 }
766
767 status = 1;
768
769 bail:
770 mlog_exit(status);
771 return status;
772 }
773
774 static int __init ocfs2_init(void)
775 {
776 int status;
777
778 mlog_entry_void();
779
780 ocfs2_print_version();
781
782 if (init_ocfs2_extent_maps())
783 return -ENOMEM;
784
785 status = init_ocfs2_uptodate_cache();
786 if (status < 0) {
787 mlog_errno(status);
788 goto leave;
789 }
790
791 status = ocfs2_initialize_mem_caches();
792 if (status < 0) {
793 mlog_errno(status);
794 goto leave;
795 }
796
797 ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
798 if (!ocfs2_wq) {
799 status = -ENOMEM;
800 goto leave;
801 }
802
803 spin_lock(&ocfs2_globals_lock);
804 osb_id = 0;
805 spin_unlock(&ocfs2_globals_lock);
806
807 ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
808 if (!ocfs2_debugfs_root) {
809 status = -EFAULT;
810 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
811 }
812
813 leave:
814 if (status < 0) {
815 ocfs2_free_mem_caches();
816 exit_ocfs2_uptodate_cache();
817 exit_ocfs2_extent_maps();
818 }
819
820 mlog_exit(status);
821
822 if (status >= 0) {
823 return register_filesystem(&ocfs2_fs_type);
824 } else
825 return -1;
826 }
827
828 static void __exit ocfs2_exit(void)
829 {
830 mlog_entry_void();
831
832 if (ocfs2_wq) {
833 flush_workqueue(ocfs2_wq);
834 destroy_workqueue(ocfs2_wq);
835 }
836
837 debugfs_remove(ocfs2_debugfs_root);
838
839 ocfs2_free_mem_caches();
840
841 unregister_filesystem(&ocfs2_fs_type);
842
843 exit_ocfs2_extent_maps();
844
845 exit_ocfs2_uptodate_cache();
846
847 mlog_exit_void();
848 }
849
850 static void ocfs2_put_super(struct super_block *sb)
851 {
852 mlog_entry("(0x%p)\n", sb);
853
854 ocfs2_sync_blockdev(sb);
855 ocfs2_dismount_volume(sb, 0);
856
857 mlog_exit_void();
858 }
859
860 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
861 {
862 struct ocfs2_super *osb;
863 u32 numbits, freebits;
864 int status;
865 struct ocfs2_dinode *bm_lock;
866 struct buffer_head *bh = NULL;
867 struct inode *inode = NULL;
868
869 mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
870
871 osb = OCFS2_SB(dentry->d_sb);
872
873 inode = ocfs2_get_system_file_inode(osb,
874 GLOBAL_BITMAP_SYSTEM_INODE,
875 OCFS2_INVALID_SLOT);
876 if (!inode) {
877 mlog(ML_ERROR, "failed to get bitmap inode\n");
878 status = -EIO;
879 goto bail;
880 }
881
882 status = ocfs2_meta_lock(inode, NULL, &bh, 0);
883 if (status < 0) {
884 mlog_errno(status);
885 goto bail;
886 }
887
888 bm_lock = (struct ocfs2_dinode *) bh->b_data;
889
890 numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
891 freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
892
893 buf->f_type = OCFS2_SUPER_MAGIC;
894 buf->f_bsize = dentry->d_sb->s_blocksize;
895 buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
896 buf->f_blocks = ((sector_t) numbits) *
897 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
898 buf->f_bfree = ((sector_t) freebits) *
899 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
900 buf->f_bavail = buf->f_bfree;
901 buf->f_files = numbits;
902 buf->f_ffree = freebits;
903
904 brelse(bh);
905
906 ocfs2_meta_unlock(inode, 0);
907 status = 0;
908 bail:
909 if (inode)
910 iput(inode);
911
912 mlog_exit(status);
913
914 return status;
915 }
916
917 static void ocfs2_inode_init_once(void *data,
918 kmem_cache_t *cachep,
919 unsigned long flags)
920 {
921 struct ocfs2_inode_info *oi = data;
922
923 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
924 SLAB_CTOR_CONSTRUCTOR) {
925 oi->ip_flags = 0;
926 oi->ip_open_count = 0;
927 spin_lock_init(&oi->ip_lock);
928 ocfs2_extent_map_init(&oi->vfs_inode);
929 INIT_LIST_HEAD(&oi->ip_handle_list);
930 INIT_LIST_HEAD(&oi->ip_io_markers);
931 oi->ip_handle = NULL;
932 oi->ip_created_trans = 0;
933 oi->ip_last_trans = 0;
934 oi->ip_dir_start_lookup = 0;
935
936 init_rwsem(&oi->ip_alloc_sem);
937 mutex_init(&oi->ip_io_mutex);
938
939 oi->ip_blkno = 0ULL;
940 oi->ip_clusters = 0;
941
942 ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
943 ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
944 ocfs2_lock_res_init_once(&oi->ip_data_lockres);
945
946 ocfs2_metadata_cache_init(&oi->vfs_inode);
947
948 inode_init_once(&oi->vfs_inode);
949 }
950 }
951
952 static int ocfs2_initialize_mem_caches(void)
953 {
954 ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
955 sizeof(struct ocfs2_inode_info),
956 0,
957 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
958 SLAB_MEM_SPREAD),
959 ocfs2_inode_init_once, NULL);
960 if (!ocfs2_inode_cachep)
961 return -ENOMEM;
962
963 ocfs2_lock_cache = kmem_cache_create("ocfs2_lock",
964 sizeof(struct ocfs2_journal_lock),
965 0,
966 SLAB_HWCACHE_ALIGN,
967 NULL, NULL);
968 if (!ocfs2_lock_cache)
969 return -ENOMEM;
970
971 return 0;
972 }
973
974 static void ocfs2_free_mem_caches(void)
975 {
976 if (ocfs2_inode_cachep)
977 kmem_cache_destroy(ocfs2_inode_cachep);
978 if (ocfs2_lock_cache)
979 kmem_cache_destroy(ocfs2_lock_cache);
980
981 ocfs2_inode_cachep = NULL;
982 ocfs2_lock_cache = NULL;
983 }
984
985 static int ocfs2_get_sector(struct super_block *sb,
986 struct buffer_head **bh,
987 int block,
988 int sect_size)
989 {
990 if (!sb_set_blocksize(sb, sect_size)) {
991 mlog(ML_ERROR, "unable to set blocksize\n");
992 return -EIO;
993 }
994
995 *bh = sb_getblk(sb, block);
996 if (!*bh) {
997 mlog_errno(-EIO);
998 return -EIO;
999 }
1000 lock_buffer(*bh);
1001 if (!buffer_dirty(*bh))
1002 clear_buffer_uptodate(*bh);
1003 unlock_buffer(*bh);
1004 ll_rw_block(READ, 1, bh);
1005 wait_on_buffer(*bh);
1006 return 0;
1007 }
1008
1009 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1010 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1011 {
1012 int status;
1013
1014 /* XXX hold a ref on the node while mounte? easy enough, if
1015 * desirable. */
1016 osb->node_num = o2nm_this_node();
1017 if (osb->node_num == O2NM_MAX_NODES) {
1018 mlog(ML_ERROR, "could not find this host's node number\n");
1019 status = -ENOENT;
1020 goto bail;
1021 }
1022
1023 mlog(ML_NOTICE, "I am node %d\n", osb->node_num);
1024
1025 status = 0;
1026 bail:
1027 return status;
1028 }
1029
1030 static int ocfs2_mount_volume(struct super_block *sb)
1031 {
1032 int status = 0;
1033 int unlock_super = 0;
1034 struct ocfs2_super *osb = OCFS2_SB(sb);
1035
1036 mlog_entry_void();
1037
1038 if (ocfs2_is_hard_readonly(osb))
1039 goto leave;
1040
1041 status = ocfs2_fill_local_node_info(osb);
1042 if (status < 0) {
1043 mlog_errno(status);
1044 goto leave;
1045 }
1046
1047 status = ocfs2_register_hb_callbacks(osb);
1048 if (status < 0) {
1049 mlog_errno(status);
1050 goto leave;
1051 }
1052
1053 status = ocfs2_dlm_init(osb);
1054 if (status < 0) {
1055 mlog_errno(status);
1056 goto leave;
1057 }
1058
1059 /* requires vote_thread to be running. */
1060 status = ocfs2_register_net_handlers(osb);
1061 if (status < 0) {
1062 mlog_errno(status);
1063 goto leave;
1064 }
1065
1066 status = ocfs2_super_lock(osb, 1);
1067 if (status < 0) {
1068 mlog_errno(status);
1069 goto leave;
1070 }
1071 unlock_super = 1;
1072
1073 /* This will load up the node map and add ourselves to it. */
1074 status = ocfs2_find_slot(osb);
1075 if (status < 0) {
1076 mlog_errno(status);
1077 goto leave;
1078 }
1079
1080 ocfs2_populate_mounted_map(osb);
1081
1082 /* load all node-local system inodes */
1083 status = ocfs2_init_local_system_inodes(osb);
1084 if (status < 0) {
1085 mlog_errno(status);
1086 goto leave;
1087 }
1088
1089 status = ocfs2_check_volume(osb);
1090 if (status < 0) {
1091 mlog_errno(status);
1092 goto leave;
1093 }
1094
1095 status = ocfs2_truncate_log_init(osb);
1096 if (status < 0) {
1097 mlog_errno(status);
1098 goto leave;
1099 }
1100
1101 /* This should be sent *after* we recovered our journal as it
1102 * will cause other nodes to unmark us as needing
1103 * recovery. However, we need to send it *before* dropping the
1104 * super block lock as otherwise their recovery threads might
1105 * try to clean us up while we're live! */
1106 status = ocfs2_request_mount_vote(osb);
1107 if (status < 0)
1108 mlog_errno(status);
1109
1110 leave:
1111 if (unlock_super)
1112 ocfs2_super_unlock(osb, 1);
1113
1114 mlog_exit(status);
1115 return status;
1116 }
1117
1118 /* we can't grab the goofy sem lock from inside wait_event, so we use
1119 * memory barriers to make sure that we'll see the null task before
1120 * being woken up */
1121 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1122 {
1123 mb();
1124 return osb->recovery_thread_task != NULL;
1125 }
1126
1127 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1128 {
1129 int tmp;
1130 struct ocfs2_super *osb = NULL;
1131
1132 mlog_entry("(0x%p)\n", sb);
1133
1134 BUG_ON(!sb);
1135 osb = OCFS2_SB(sb);
1136 BUG_ON(!osb);
1137
1138 ocfs2_shutdown_local_alloc(osb);
1139
1140 ocfs2_truncate_log_shutdown(osb);
1141
1142 /* disable any new recovery threads and wait for any currently
1143 * running ones to exit. Do this before setting the vol_state. */
1144 mutex_lock(&osb->recovery_lock);
1145 osb->disable_recovery = 1;
1146 mutex_unlock(&osb->recovery_lock);
1147 wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1148
1149 /* At this point, we know that no more recovery threads can be
1150 * launched, so wait for any recovery completion work to
1151 * complete. */
1152 flush_workqueue(ocfs2_wq);
1153
1154 ocfs2_journal_shutdown(osb);
1155
1156 ocfs2_sync_blockdev(sb);
1157
1158 /* No dlm means we've failed during mount, so skip all the
1159 * steps which depended on that to complete. */
1160 if (osb->dlm) {
1161 tmp = ocfs2_super_lock(osb, 1);
1162 if (tmp < 0) {
1163 mlog_errno(tmp);
1164 return;
1165 }
1166
1167 tmp = ocfs2_request_umount_vote(osb);
1168 if (tmp < 0)
1169 mlog_errno(tmp);
1170
1171 if (osb->slot_num != OCFS2_INVALID_SLOT)
1172 ocfs2_put_slot(osb);
1173
1174 ocfs2_super_unlock(osb, 1);
1175 }
1176
1177 ocfs2_release_system_inodes(osb);
1178
1179 if (osb->dlm) {
1180 ocfs2_unregister_net_handlers(osb);
1181
1182 ocfs2_dlm_shutdown(osb);
1183 }
1184
1185 ocfs2_clear_hb_callbacks(osb);
1186
1187 debugfs_remove(osb->osb_debug_root);
1188
1189 if (!mnt_err)
1190 ocfs2_stop_heartbeat(osb);
1191
1192 atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1193
1194 printk("ocfs2: Unmounting device (%u,%u) on (node %d)\n",
1195 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev), osb->node_num);
1196
1197 ocfs2_delete_osb(osb);
1198 kfree(osb);
1199 sb->s_dev = 0;
1200 sb->s_fs_info = NULL;
1201 }
1202
1203 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1204 unsigned uuid_bytes)
1205 {
1206 int i, ret;
1207 char *ptr;
1208
1209 BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1210
1211 osb->uuid_str = kcalloc(1, OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1212 if (osb->uuid_str == NULL)
1213 return -ENOMEM;
1214
1215 memcpy(osb->uuid, uuid, OCFS2_VOL_UUID_LEN);
1216
1217 for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1218 /* print with null */
1219 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1220 if (ret != 2) /* drop super cleans up */
1221 return -EINVAL;
1222 /* then only advance past the last char */
1223 ptr += 2;
1224 }
1225
1226 return 0;
1227 }
1228
1229 static int ocfs2_initialize_super(struct super_block *sb,
1230 struct buffer_head *bh,
1231 int sector_size)
1232 {
1233 int status = 0;
1234 int i;
1235 struct ocfs2_dinode *di = NULL;
1236 struct inode *inode = NULL;
1237 struct buffer_head *bitmap_bh = NULL;
1238 struct ocfs2_journal *journal;
1239 __le32 uuid_net_key;
1240 struct ocfs2_super *osb;
1241
1242 mlog_entry_void();
1243
1244 osb = kcalloc(1, sizeof(struct ocfs2_super), GFP_KERNEL);
1245 if (!osb) {
1246 status = -ENOMEM;
1247 mlog_errno(status);
1248 goto bail;
1249 }
1250
1251 sb->s_fs_info = osb;
1252 sb->s_op = &ocfs2_sops;
1253 sb->s_export_op = &ocfs2_export_ops;
1254 sb->s_flags |= MS_NOATIME;
1255 /* this is needed to support O_LARGEFILE */
1256 sb->s_maxbytes = ocfs2_max_file_offset(sb->s_blocksize_bits);
1257
1258 osb->sb = sb;
1259 /* Save off for ocfs2_rw_direct */
1260 osb->s_sectsize_bits = blksize_bits(sector_size);
1261 BUG_ON(!osb->s_sectsize_bits);
1262
1263 osb->net_response_ids = 0;
1264 spin_lock_init(&osb->net_response_lock);
1265 INIT_LIST_HEAD(&osb->net_response_list);
1266
1267 INIT_LIST_HEAD(&osb->osb_net_handlers);
1268 init_waitqueue_head(&osb->recovery_event);
1269 spin_lock_init(&osb->vote_task_lock);
1270 init_waitqueue_head(&osb->vote_event);
1271 osb->vote_work_sequence = 0;
1272 osb->vote_wake_sequence = 0;
1273 INIT_LIST_HEAD(&osb->blocked_lock_list);
1274 osb->blocked_lock_count = 0;
1275 INIT_LIST_HEAD(&osb->vote_list);
1276 spin_lock_init(&osb->osb_lock);
1277
1278 atomic_set(&osb->alloc_stats.moves, 0);
1279 atomic_set(&osb->alloc_stats.local_data, 0);
1280 atomic_set(&osb->alloc_stats.bitmap_data, 0);
1281 atomic_set(&osb->alloc_stats.bg_allocs, 0);
1282 atomic_set(&osb->alloc_stats.bg_extends, 0);
1283
1284 ocfs2_init_node_maps(osb);
1285
1286 snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1287 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1288
1289 mutex_init(&osb->recovery_lock);
1290
1291 osb->disable_recovery = 0;
1292 osb->recovery_thread_task = NULL;
1293
1294 init_waitqueue_head(&osb->checkpoint_event);
1295 atomic_set(&osb->needs_checkpoint, 0);
1296
1297 osb->node_num = O2NM_INVALID_NODE_NUM;
1298 osb->slot_num = OCFS2_INVALID_SLOT;
1299
1300 osb->local_alloc_state = OCFS2_LA_UNUSED;
1301 osb->local_alloc_bh = NULL;
1302
1303 ocfs2_setup_hb_callbacks(osb);
1304
1305 init_waitqueue_head(&osb->osb_mount_event);
1306
1307 osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1308 if (!osb->vol_label) {
1309 mlog(ML_ERROR, "unable to alloc vol label\n");
1310 status = -ENOMEM;
1311 goto bail;
1312 }
1313
1314 osb->uuid = kmalloc(OCFS2_VOL_UUID_LEN, GFP_KERNEL);
1315 if (!osb->uuid) {
1316 mlog(ML_ERROR, "unable to alloc uuid\n");
1317 status = -ENOMEM;
1318 goto bail;
1319 }
1320
1321 di = (struct ocfs2_dinode *)bh->b_data;
1322
1323 osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1324 if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1325 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1326 osb->max_slots);
1327 status = -EINVAL;
1328 goto bail;
1329 }
1330 mlog(ML_NOTICE, "max_slots for this device: %u\n", osb->max_slots);
1331
1332 init_waitqueue_head(&osb->osb_wipe_event);
1333 osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1334 sizeof(*osb->osb_orphan_wipes),
1335 GFP_KERNEL);
1336 if (!osb->osb_orphan_wipes) {
1337 status = -ENOMEM;
1338 mlog_errno(status);
1339 goto bail;
1340 }
1341
1342 osb->s_feature_compat =
1343 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1344 osb->s_feature_ro_compat =
1345 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1346 osb->s_feature_incompat =
1347 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1348
1349 if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1350 mlog(ML_ERROR, "couldn't mount because of unsupported "
1351 "optional features (%x).\n", i);
1352 status = -EINVAL;
1353 goto bail;
1354 }
1355 if (!(osb->sb->s_flags & MS_RDONLY) &&
1356 (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1357 mlog(ML_ERROR, "couldn't mount RDWR because of "
1358 "unsupported optional features (%x).\n", i);
1359 status = -EINVAL;
1360 goto bail;
1361 }
1362
1363 get_random_bytes(&osb->s_next_generation, sizeof(u32));
1364
1365 /* FIXME
1366 * This should be done in ocfs2_journal_init(), but unknown
1367 * ordering issues will cause the filesystem to crash.
1368 * If anyone wants to figure out what part of the code
1369 * refers to osb->journal before ocfs2_journal_init() is run,
1370 * be my guest.
1371 */
1372 /* initialize our journal structure */
1373
1374 journal = kcalloc(1, sizeof(struct ocfs2_journal), GFP_KERNEL);
1375 if (!journal) {
1376 mlog(ML_ERROR, "unable to alloc journal\n");
1377 status = -ENOMEM;
1378 goto bail;
1379 }
1380 osb->journal = journal;
1381 journal->j_osb = osb;
1382
1383 atomic_set(&journal->j_num_trans, 0);
1384 init_rwsem(&journal->j_trans_barrier);
1385 init_waitqueue_head(&journal->j_checkpointed);
1386 spin_lock_init(&journal->j_lock);
1387 journal->j_trans_id = (unsigned long) 1;
1388 INIT_LIST_HEAD(&journal->j_la_cleanups);
1389 INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery, osb);
1390 journal->j_state = OCFS2_JOURNAL_FREE;
1391
1392 /* get some pseudo constants for clustersize bits */
1393 osb->s_clustersize_bits =
1394 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1395 osb->s_clustersize = 1 << osb->s_clustersize_bits;
1396 mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1397
1398 if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1399 osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1400 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1401 osb->s_clustersize);
1402 status = -EINVAL;
1403 goto bail;
1404 }
1405
1406 if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1407 > (u32)~0UL) {
1408 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1409 "what jbd can address in 32 bits.\n");
1410 status = -EINVAL;
1411 goto bail;
1412 }
1413
1414 if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1415 sizeof(di->id2.i_super.s_uuid))) {
1416 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1417 status = -ENOMEM;
1418 goto bail;
1419 }
1420
1421 memcpy(&uuid_net_key, &osb->uuid[i], sizeof(osb->net_key));
1422 osb->net_key = le32_to_cpu(uuid_net_key);
1423
1424 strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1425 osb->vol_label[63] = '\0';
1426 osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1427 osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1428 osb->first_cluster_group_blkno =
1429 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1430 osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1431 mlog(0, "vol_label: %s\n", osb->vol_label);
1432 mlog(0, "uuid: %s\n", osb->uuid_str);
1433 mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1434 (unsigned long long)osb->root_blkno,
1435 (unsigned long long)osb->system_dir_blkno);
1436
1437 osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1438 if (!osb->osb_dlm_debug) {
1439 status = -ENOMEM;
1440 mlog_errno(status);
1441 goto bail;
1442 }
1443
1444 atomic_set(&osb->vol_state, VOLUME_INIT);
1445
1446 /* load root, system_dir, and all global system inodes */
1447 status = ocfs2_init_global_system_inodes(osb);
1448 if (status < 0) {
1449 mlog_errno(status);
1450 goto bail;
1451 }
1452
1453 /*
1454 * global bitmap
1455 */
1456 inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1457 OCFS2_INVALID_SLOT);
1458 if (!inode) {
1459 status = -EINVAL;
1460 mlog_errno(status);
1461 goto bail;
1462 }
1463
1464 osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1465
1466 status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1467 inode);
1468 iput(inode);
1469 if (status < 0) {
1470 mlog_errno(status);
1471 goto bail;
1472 }
1473
1474 di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1475 osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1476 osb->num_clusters = le32_to_cpu(di->id1.bitmap1.i_total);
1477 brelse(bitmap_bh);
1478 mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1479 (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1480
1481 status = ocfs2_init_slot_info(osb);
1482 if (status < 0) {
1483 mlog_errno(status);
1484 goto bail;
1485 }
1486
1487 /* Link this osb onto the global linked list of all osb structures. */
1488 /* The Global Link List is mainted for the whole driver . */
1489 spin_lock(&ocfs2_globals_lock);
1490 osb->osb_id = osb_id;
1491 if (osb_id < OCFS2_MAX_OSB_ID)
1492 osb_id++;
1493 else {
1494 mlog(ML_ERROR, "Too many volumes mounted\n");
1495 status = -ENOMEM;
1496 }
1497 spin_unlock(&ocfs2_globals_lock);
1498
1499 bail:
1500 mlog_exit(status);
1501 return status;
1502 }
1503
1504 /*
1505 * will return: -EAGAIN if it is ok to keep searching for superblocks
1506 * -EINVAL if there is a bad superblock
1507 * 0 on success
1508 */
1509 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1510 struct buffer_head *bh,
1511 u32 blksz)
1512 {
1513 int status = -EAGAIN;
1514
1515 mlog_entry_void();
1516
1517 if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1518 strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1519 status = -EINVAL;
1520 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1521 mlog(ML_ERROR, "found superblock with incorrect block "
1522 "size: found %u, should be %u\n",
1523 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1524 blksz);
1525 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1526 OCFS2_MAJOR_REV_LEVEL ||
1527 le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1528 OCFS2_MINOR_REV_LEVEL) {
1529 mlog(ML_ERROR, "found superblock with bad version: "
1530 "found %u.%u, should be %u.%u\n",
1531 le16_to_cpu(di->id2.i_super.s_major_rev_level),
1532 le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1533 OCFS2_MAJOR_REV_LEVEL,
1534 OCFS2_MINOR_REV_LEVEL);
1535 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1536 mlog(ML_ERROR, "bad block number on superblock: "
1537 "found %llu, should be %llu\n",
1538 (unsigned long long)di->i_blkno,
1539 (unsigned long long)bh->b_blocknr);
1540 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1541 le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1542 mlog(ML_ERROR, "bad cluster size found: %u\n",
1543 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1544 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1545 mlog(ML_ERROR, "bad root_blkno: 0\n");
1546 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1547 mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1548 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1549 mlog(ML_ERROR,
1550 "Superblock slots found greater than file system "
1551 "maximum: found %u, max %u\n",
1552 le16_to_cpu(di->id2.i_super.s_max_slots),
1553 OCFS2_MAX_SLOTS);
1554 } else {
1555 /* found it! */
1556 status = 0;
1557 }
1558 }
1559
1560 mlog_exit(status);
1561 return status;
1562 }
1563
1564 static int ocfs2_check_volume(struct ocfs2_super *osb)
1565 {
1566 int status = 0;
1567 int dirty;
1568 struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1569 * recover
1570 * ourselves. */
1571
1572 mlog_entry_void();
1573
1574 /* Init our journal object. */
1575 status = ocfs2_journal_init(osb->journal, &dirty);
1576 if (status < 0) {
1577 mlog(ML_ERROR, "Could not initialize journal!\n");
1578 goto finally;
1579 }
1580
1581 /* If the journal was unmounted cleanly then we don't want to
1582 * recover anything. Otherwise, journal_load will do that
1583 * dirty work for us :) */
1584 if (!dirty) {
1585 status = ocfs2_journal_wipe(osb->journal, 0);
1586 if (status < 0) {
1587 mlog_errno(status);
1588 goto finally;
1589 }
1590 } else {
1591 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1592 "recovering volume.\n");
1593 }
1594
1595 /* will play back anything left in the journal. */
1596 ocfs2_journal_load(osb->journal);
1597
1598 if (dirty) {
1599 /* recover my local alloc if we didn't unmount cleanly. */
1600 status = ocfs2_begin_local_alloc_recovery(osb,
1601 osb->slot_num,
1602 &local_alloc);
1603 if (status < 0) {
1604 mlog_errno(status);
1605 goto finally;
1606 }
1607 /* we complete the recovery process after we've marked
1608 * ourselves as mounted. */
1609 }
1610
1611 mlog(0, "Journal loaded.\n");
1612
1613 status = ocfs2_load_local_alloc(osb);
1614 if (status < 0) {
1615 mlog_errno(status);
1616 goto finally;
1617 }
1618
1619 if (dirty) {
1620 /* Recovery will be completed after we've mounted the
1621 * rest of the volume. */
1622 osb->dirty = 1;
1623 osb->local_alloc_copy = local_alloc;
1624 local_alloc = NULL;
1625 }
1626
1627 /* go through each journal, trylock it and if you get the
1628 * lock, and it's marked as dirty, set the bit in the recover
1629 * map and launch a recovery thread for it. */
1630 status = ocfs2_mark_dead_nodes(osb);
1631 if (status < 0)
1632 mlog_errno(status);
1633
1634 finally:
1635 if (local_alloc)
1636 kfree(local_alloc);
1637
1638 mlog_exit(status);
1639 return status;
1640 }
1641
1642 /*
1643 * The routine gets called from dismount or close whenever a dismount on
1644 * volume is requested and the osb open count becomes 1.
1645 * It will remove the osb from the global list and also free up all the
1646 * initialized resources and fileobject.
1647 */
1648 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1649 {
1650 mlog_entry_void();
1651
1652 /* This function assumes that the caller has the main osb resource */
1653
1654 if (osb->slot_info)
1655 ocfs2_free_slot_info(osb->slot_info);
1656
1657 kfree(osb->osb_orphan_wipes);
1658 /* FIXME
1659 * This belongs in journal shutdown, but because we have to
1660 * allocate osb->journal at the start of ocfs2_initalize_osb(),
1661 * we free it here.
1662 */
1663 kfree(osb->journal);
1664 if (osb->local_alloc_copy)
1665 kfree(osb->local_alloc_copy);
1666 kfree(osb->uuid_str);
1667 ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1668 memset(osb, 0, sizeof(struct ocfs2_super));
1669
1670 mlog_exit_void();
1671 }
1672
1673 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1674 * panic(). We do not support continue-on-error operation. */
1675 static void ocfs2_handle_error(struct super_block *sb)
1676 {
1677 struct ocfs2_super *osb = OCFS2_SB(sb);
1678
1679 if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1680 panic("OCFS2: (device %s): panic forced after error\n",
1681 sb->s_id);
1682
1683 ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1684
1685 if (sb->s_flags & MS_RDONLY &&
1686 (ocfs2_is_soft_readonly(osb) ||
1687 ocfs2_is_hard_readonly(osb)))
1688 return;
1689
1690 printk(KERN_CRIT "File system is now read-only due to the potential "
1691 "of on-disk corruption. Please run fsck.ocfs2 once the file "
1692 "system is unmounted.\n");
1693 sb->s_flags |= MS_RDONLY;
1694 ocfs2_set_ro_flag(osb, 0);
1695 }
1696
1697 static char error_buf[1024];
1698
1699 void __ocfs2_error(struct super_block *sb,
1700 const char *function,
1701 const char *fmt, ...)
1702 {
1703 va_list args;
1704
1705 va_start(args, fmt);
1706 vsprintf(error_buf, fmt, args);
1707 va_end(args);
1708
1709 /* Not using mlog here because we want to show the actual
1710 * function the error came from. */
1711 printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1712 sb->s_id, function, error_buf);
1713
1714 ocfs2_handle_error(sb);
1715 }
1716
1717 /* Handle critical errors. This is intentionally more drastic than
1718 * ocfs2_handle_error, so we only use for things like journal errors,
1719 * etc. */
1720 void __ocfs2_abort(struct super_block* sb,
1721 const char *function,
1722 const char *fmt, ...)
1723 {
1724 va_list args;
1725
1726 va_start(args, fmt);
1727 vsprintf(error_buf, fmt, args);
1728 va_end(args);
1729
1730 printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1731 sb->s_id, function, error_buf);
1732
1733 /* We don't have the cluster support yet to go straight to
1734 * hard readonly in here. Until then, we want to keep
1735 * ocfs2_abort() so that we can at least mark critical
1736 * errors.
1737 *
1738 * TODO: This should abort the journal and alert other nodes
1739 * that our slot needs recovery. */
1740
1741 /* Force a panic(). This stinks, but it's better than letting
1742 * things continue without having a proper hard readonly
1743 * here. */
1744 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1745 ocfs2_handle_error(sb);
1746 }
1747
1748 module_init(ocfs2_init);
1749 module_exit(ocfs2_exit);
Linux kernel - Deliverables
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