1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * load/unload driver, mount/dismount volumes
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
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.
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.
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.
26 #include <linux/module.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>
44 #include <cluster/nodemanager.h>
46 #define MLOG_MASK_PREFIX ML_SUPER
47 #include <cluster/masklog.h>
51 /* this should be the only file to include a version 1 header */
52 #include "ocfs1_fs_compat.h"
57 #include "extent_map.h"
58 #include "heartbeat.h"
61 #include "localalloc.h"
70 #include "buffer_head_io.h"
72 static struct kmem_cache *ocfs2_inode_cachep = NULL;
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;
80 static struct dentry *ocfs2_debugfs_root = NULL;
82 MODULE_AUTHOR("Oracle");
83 MODULE_LICENSE("GPL");
87 unsigned long mount_opt;
88 unsigned int atime_quantum;
92 static int ocfs2_parse_options(struct super_block *sb, char *options,
93 struct mount_options *mopt,
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);
104 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
106 static int ocfs2_sync_fs(struct super_block *sb, int wait);
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 int 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,
116 static int ocfs2_initialize_super(struct super_block *sb,
117 struct buffer_head *bh,
119 static int ocfs2_get_sector(struct super_block *sb,
120 struct buffer_head **bh,
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);
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,
156 static match_table_t tokens = {
157 {Opt_barrier, "barrier=%u"},
158 {Opt_err_panic, "errors=panic"},
159 {Opt_err_ro, "errors=remount-ro"},
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"},
172 * write_super and sync_fs ripped right out of ext3.
174 static void ocfs2_write_super(struct super_block *sb)
176 if (mutex_trylock(&sb->s_lock) != 0)
181 static int ocfs2_sync_fs(struct super_block *sb, int wait)
185 struct ocfs2_super *osb = OCFS2_SB(sb);
189 if (ocfs2_is_hard_readonly(osb))
193 status = ocfs2_flush_truncate_log(osb);
197 ocfs2_schedule_truncate_log_flush(osb, 0);
200 if (journal_start_commit(OCFS2_SB(sb)->journal->j_journal, &target)) {
202 log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
208 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
210 struct inode *new = NULL;
216 new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
218 status = PTR_ERR(new);
222 osb->root_inode = new;
224 new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
226 status = PTR_ERR(new);
230 osb->sys_root_inode = new;
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);
236 ocfs2_release_system_inodes(osb);
239 /* FIXME: Should ERROR_RO_FS */
240 mlog(ML_ERROR, "Unable to load system inode %d, "
241 "possibly corrupt fs?", i);
244 // the array now has one ref, so drop this one
253 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
255 struct inode *new = NULL;
261 for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
262 i < NUM_SYSTEM_INODES;
264 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
266 ocfs2_release_system_inodes(osb);
268 mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
269 status, i, osb->slot_num);
272 /* the array now has one ref, so drop this one */
281 static int ocfs2_release_system_inodes(struct ocfs2_super *osb)
288 for (i = 0; i < NUM_SYSTEM_INODES; i++) {
289 inode = osb->system_inodes[i];
292 osb->system_inodes[i] = NULL;
296 inode = osb->sys_root_inode;
299 osb->sys_root_inode = NULL;
302 inode = osb->root_inode;
305 osb->root_inode = NULL;
312 /* We're allocating fs objects, use GFP_NOFS */
313 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
315 struct ocfs2_inode_info *oi;
317 oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
321 return &oi->vfs_inode;
324 static void ocfs2_destroy_inode(struct inode *inode)
326 kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
329 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
332 unsigned int bytes = 1 << cbits;
333 unsigned int trim = bytes;
334 unsigned int bitshift = 32;
337 * i_size and all block offsets in ocfs2 are always 64 bits
338 * wide. i_clusters is 32 bits, in cluster-sized units. So on
339 * 64 bit platforms, cluster size will be the limiting factor.
342 #if BITS_PER_LONG == 32
343 # if defined(CONFIG_LBD)
344 BUILD_BUG_ON(sizeof(sector_t) != 8);
346 * We might be limited by page cache size.
348 if (bytes > PAGE_CACHE_SIZE) {
349 bytes = PAGE_CACHE_SIZE;
352 * Shift by 31 here so that we don't get larger than
359 * We are limited by the size of sector_t. Use block size, as
360 * that's what we expose to the VFS.
369 * Trim by a whole cluster when we can actually approach the
370 * on-disk limits. Otherwise we can overflow i_clusters when
371 * an extent start is at the max offset.
373 return (((unsigned long long)bytes) << bitshift) - trim;
376 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
378 int incompat_features;
380 struct mount_options parsed_options;
381 struct ocfs2_super *osb = OCFS2_SB(sb);
383 if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
388 if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
389 (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
391 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
395 if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
396 (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
398 mlog(ML_ERROR, "Cannot change data mode on remount\n");
402 /* We're going to/from readonly mode. */
403 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
404 /* Lock here so the check of HARD_RO and the potential
405 * setting of SOFT_RO is atomic. */
406 spin_lock(&osb->osb_lock);
407 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
408 mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
413 if (*flags & MS_RDONLY) {
414 mlog(0, "Going to ro mode.\n");
415 sb->s_flags |= MS_RDONLY;
416 osb->osb_flags |= OCFS2_OSB_SOFT_RO;
418 mlog(0, "Making ro filesystem writeable.\n");
420 if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
421 mlog(ML_ERROR, "Cannot remount RDWR "
422 "filesystem due to previous errors.\n");
426 incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
427 if (incompat_features) {
428 mlog(ML_ERROR, "Cannot remount RDWR because "
429 "of unsupported optional features "
430 "(%x).\n", incompat_features);
434 sb->s_flags &= ~MS_RDONLY;
435 osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
438 spin_unlock(&osb->osb_lock);
442 if (!ocfs2_is_hard_readonly(osb))
443 ocfs2_set_journal_params(osb);
445 /* Only save off the new mount options in case of a successful
447 osb->s_mount_opt = parsed_options.mount_opt;
448 osb->s_atime_quantum = parsed_options.atime_quantum;
449 osb->preferred_slot = parsed_options.slot;
455 static int ocfs2_sb_probe(struct super_block *sb,
456 struct buffer_head **bh,
459 int status = 0, tmpstat;
460 struct ocfs1_vol_disk_hdr *hdr;
461 struct ocfs2_dinode *di;
467 *sector_size = bdev_hardsect_size(sb->s_bdev);
468 if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
469 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
470 *sector_size, OCFS2_MAX_BLOCKSIZE);
475 /* Can this really happen? */
476 if (*sector_size < OCFS2_MIN_BLOCKSIZE)
477 *sector_size = OCFS2_MIN_BLOCKSIZE;
479 /* check block zero for old format */
480 status = ocfs2_get_sector(sb, bh, 0, *sector_size);
485 hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
486 if (hdr->major_version == OCFS1_MAJOR_VERSION) {
487 mlog(ML_ERROR, "incompatible version: %u.%u\n",
488 hdr->major_version, hdr->minor_version);
491 if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
492 strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
493 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
500 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
501 "upgraded before mounting with ocfs v2\n");
506 * Now check at magic offset for 512, 1024, 2048, 4096
507 * blocksizes. 4096 is the maximum blocksize because it is
508 * the minimum clustersize.
511 for (blksize = *sector_size;
512 blksize <= OCFS2_MAX_BLOCKSIZE;
514 tmpstat = ocfs2_get_sector(sb, bh,
515 OCFS2_SUPER_BLOCK_BLKNO,
522 di = (struct ocfs2_dinode *) (*bh)->b_data;
523 status = ocfs2_verify_volume(di, *bh, blksize);
528 if (status != -EAGAIN)
536 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
538 if (ocfs2_mount_local(osb)) {
539 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
540 mlog(ML_ERROR, "Cannot heartbeat on a locally "
541 "mounted device.\n");
546 if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
547 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb)) {
548 mlog(ML_ERROR, "Heartbeat has to be started to mount "
549 "a read-write clustered device.\n");
557 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
560 int status, sector_size;
561 struct mount_options parsed_options;
562 struct inode *inode = NULL;
563 struct ocfs2_super *osb = NULL;
564 struct buffer_head *bh = NULL;
567 mlog_entry("%p, %p, %i", sb, data, silent);
569 if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
571 goto read_super_error;
574 /* for now we only have one cluster/node, make sure we see it
575 * in the heartbeat universe */
576 if (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL) {
577 if (!o2hb_check_local_node_heartbeating()) {
579 goto read_super_error;
583 /* probe for superblock */
584 status = ocfs2_sb_probe(sb, &bh, §or_size);
586 mlog(ML_ERROR, "superblock probe failed!\n");
587 goto read_super_error;
590 status = ocfs2_initialize_super(sb, bh, sector_size);
594 goto read_super_error;
598 osb->s_mount_opt = parsed_options.mount_opt;
599 osb->s_atime_quantum = parsed_options.atime_quantum;
600 osb->preferred_slot = parsed_options.slot;
602 sb->s_magic = OCFS2_SUPER_MAGIC;
604 /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
606 if (bdev_read_only(sb->s_bdev)) {
607 if (!(sb->s_flags & MS_RDONLY)) {
609 mlog(ML_ERROR, "Readonly device detected but readonly "
610 "mount was not specified.\n");
611 goto read_super_error;
614 /* You should not be able to start a local heartbeat
615 * on a readonly device. */
616 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
618 mlog(ML_ERROR, "Local heartbeat specified on readonly "
620 goto read_super_error;
623 status = ocfs2_check_journals_nolocks(osb);
625 if (status == -EROFS)
626 mlog(ML_ERROR, "Recovery required on readonly "
627 "file system, but write access is "
631 goto read_super_error;
634 ocfs2_set_ro_flag(osb, 1);
636 printk(KERN_NOTICE "Readonly device detected. No cluster "
637 "services will be utilized for this mount. Recovery "
638 "will be skipped.\n");
641 if (!ocfs2_is_hard_readonly(osb)) {
642 if (sb->s_flags & MS_RDONLY)
643 ocfs2_set_ro_flag(osb, 0);
646 status = ocfs2_verify_heartbeat(osb);
649 goto read_super_error;
652 osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
654 if (!osb->osb_debug_root) {
656 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
657 goto read_super_error;
660 status = ocfs2_mount_volume(sb);
662 inode = igrab(osb->root_inode);
665 goto read_super_error;
670 goto read_super_error;
673 root = d_alloc_root(inode);
677 goto read_super_error;
682 ocfs2_complete_mount_recovery(osb);
684 if (ocfs2_mount_local(osb))
685 snprintf(nodestr, sizeof(nodestr), "local");
687 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
689 printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
690 "with %s data mode.\n",
691 osb->dev_str, nodestr, osb->slot_num,
692 osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
695 atomic_set(&osb->vol_state, VOLUME_MOUNTED);
696 wake_up(&osb->osb_mount_event);
709 atomic_set(&osb->vol_state, VOLUME_DISABLED);
710 wake_up(&osb->osb_mount_event);
711 ocfs2_dismount_volume(sb, 1);
718 static int ocfs2_get_sb(struct file_system_type *fs_type,
720 const char *dev_name,
722 struct vfsmount *mnt)
724 return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
728 static struct file_system_type ocfs2_fs_type = {
729 .owner = THIS_MODULE,
731 .get_sb = ocfs2_get_sb, /* is this called when we mount
733 .kill_sb = kill_block_super, /* set to the generic one
734 * right now, but do we
735 * need to change that? */
736 .fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
740 static int ocfs2_parse_options(struct super_block *sb,
742 struct mount_options *mopt,
748 mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
749 options ? options : "(none)");
752 mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
753 mopt->slot = OCFS2_INVALID_SLOT;
760 while ((p = strsep(&options, ",")) != NULL) {
762 substring_t args[MAX_OPT_ARGS];
767 token = match_token(p, tokens, args);
770 mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
773 mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
776 if (match_int(&args[0], &option)) {
781 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
783 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
786 mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
789 mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
792 mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
795 mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
797 case Opt_data_ordered:
798 mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
800 case Opt_data_writeback:
801 mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
803 case Opt_atime_quantum:
804 if (match_int(&args[0], &option)) {
809 mopt->atime_quantum = option;
813 if (match_int(&args[0], &option)) {
818 mopt->slot = (s16)option;
822 "Unrecognized mount option \"%s\" "
823 "or missing value\n", p);
836 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
838 struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
839 unsigned long opts = osb->s_mount_opt;
841 if (opts & OCFS2_MOUNT_HB_LOCAL)
842 seq_printf(s, ",_netdev,heartbeat=local");
844 seq_printf(s, ",heartbeat=none");
846 if (opts & OCFS2_MOUNT_NOINTR)
847 seq_printf(s, ",nointr");
849 if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
850 seq_printf(s, ",data=writeback");
852 seq_printf(s, ",data=ordered");
854 if (opts & OCFS2_MOUNT_BARRIER)
855 seq_printf(s, ",barrier=1");
857 if (opts & OCFS2_MOUNT_ERRORS_PANIC)
858 seq_printf(s, ",errors=panic");
860 seq_printf(s, ",errors=remount-ro");
862 if (osb->preferred_slot != OCFS2_INVALID_SLOT)
863 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
865 if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
866 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
871 static int __init ocfs2_init(void)
877 ocfs2_print_version();
879 status = init_ocfs2_uptodate_cache();
885 status = ocfs2_initialize_mem_caches();
891 ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
897 ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
898 if (!ocfs2_debugfs_root) {
900 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
905 ocfs2_free_mem_caches();
906 exit_ocfs2_uptodate_cache();
912 return register_filesystem(&ocfs2_fs_type);
917 static void __exit ocfs2_exit(void)
922 flush_workqueue(ocfs2_wq);
923 destroy_workqueue(ocfs2_wq);
926 debugfs_remove(ocfs2_debugfs_root);
928 ocfs2_free_mem_caches();
930 unregister_filesystem(&ocfs2_fs_type);
932 exit_ocfs2_uptodate_cache();
937 static void ocfs2_put_super(struct super_block *sb)
939 mlog_entry("(0x%p)\n", sb);
941 ocfs2_sync_blockdev(sb);
942 ocfs2_dismount_volume(sb, 0);
947 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
949 struct ocfs2_super *osb;
950 u32 numbits, freebits;
952 struct ocfs2_dinode *bm_lock;
953 struct buffer_head *bh = NULL;
954 struct inode *inode = NULL;
956 mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
958 osb = OCFS2_SB(dentry->d_sb);
960 inode = ocfs2_get_system_file_inode(osb,
961 GLOBAL_BITMAP_SYSTEM_INODE,
964 mlog(ML_ERROR, "failed to get bitmap inode\n");
969 status = ocfs2_meta_lock(inode, &bh, 0);
975 bm_lock = (struct ocfs2_dinode *) bh->b_data;
977 numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
978 freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
980 buf->f_type = OCFS2_SUPER_MAGIC;
981 buf->f_bsize = dentry->d_sb->s_blocksize;
982 buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
983 buf->f_blocks = ((sector_t) numbits) *
984 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
985 buf->f_bfree = ((sector_t) freebits) *
986 (osb->s_clustersize >> osb->sb->s_blocksize_bits);
987 buf->f_bavail = buf->f_bfree;
988 buf->f_files = numbits;
989 buf->f_ffree = freebits;
993 ocfs2_meta_unlock(inode, 0);
1004 static void ocfs2_inode_init_once(void *data,
1005 struct kmem_cache *cachep,
1006 unsigned long flags)
1008 struct ocfs2_inode_info *oi = data;
1011 oi->ip_open_count = 0;
1012 spin_lock_init(&oi->ip_lock);
1013 ocfs2_extent_map_init(&oi->vfs_inode);
1014 INIT_LIST_HEAD(&oi->ip_io_markers);
1015 oi->ip_created_trans = 0;
1016 oi->ip_last_trans = 0;
1017 oi->ip_dir_start_lookup = 0;
1019 init_rwsem(&oi->ip_alloc_sem);
1020 mutex_init(&oi->ip_io_mutex);
1022 oi->ip_blkno = 0ULL;
1023 oi->ip_clusters = 0;
1025 ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1026 ocfs2_lock_res_init_once(&oi->ip_meta_lockres);
1027 ocfs2_lock_res_init_once(&oi->ip_data_lockres);
1028 ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1030 ocfs2_metadata_cache_init(&oi->vfs_inode);
1032 inode_init_once(&oi->vfs_inode);
1035 static int ocfs2_initialize_mem_caches(void)
1037 ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1038 sizeof(struct ocfs2_inode_info),
1040 (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1042 ocfs2_inode_init_once);
1043 if (!ocfs2_inode_cachep)
1049 static void ocfs2_free_mem_caches(void)
1051 if (ocfs2_inode_cachep)
1052 kmem_cache_destroy(ocfs2_inode_cachep);
1054 ocfs2_inode_cachep = NULL;
1057 static int ocfs2_get_sector(struct super_block *sb,
1058 struct buffer_head **bh,
1062 if (!sb_set_blocksize(sb, sect_size)) {
1063 mlog(ML_ERROR, "unable to set blocksize\n");
1067 *bh = sb_getblk(sb, block);
1073 if (!buffer_dirty(*bh))
1074 clear_buffer_uptodate(*bh);
1076 ll_rw_block(READ, 1, bh);
1077 wait_on_buffer(*bh);
1081 /* ocfs2 1.0 only allows one cluster and node identity per kernel image. */
1082 static int ocfs2_fill_local_node_info(struct ocfs2_super *osb)
1086 /* XXX hold a ref on the node while mounte? easy enough, if
1088 if (ocfs2_mount_local(osb))
1091 osb->node_num = o2nm_this_node();
1093 if (osb->node_num == O2NM_MAX_NODES) {
1094 mlog(ML_ERROR, "could not find this host's node number\n");
1099 mlog(0, "I am node %d\n", osb->node_num);
1106 static int ocfs2_mount_volume(struct super_block *sb)
1109 int unlock_super = 0;
1110 struct ocfs2_super *osb = OCFS2_SB(sb);
1114 if (ocfs2_is_hard_readonly(osb))
1117 status = ocfs2_fill_local_node_info(osb);
1123 status = ocfs2_register_hb_callbacks(osb);
1129 status = ocfs2_dlm_init(osb);
1135 /* requires vote_thread to be running. */
1136 status = ocfs2_register_net_handlers(osb);
1142 status = ocfs2_super_lock(osb, 1);
1149 /* This will load up the node map and add ourselves to it. */
1150 status = ocfs2_find_slot(osb);
1156 ocfs2_populate_mounted_map(osb);
1158 /* load all node-local system inodes */
1159 status = ocfs2_init_local_system_inodes(osb);
1165 status = ocfs2_check_volume(osb);
1171 status = ocfs2_truncate_log_init(osb);
1177 if (ocfs2_mount_local(osb))
1180 /* This should be sent *after* we recovered our journal as it
1181 * will cause other nodes to unmark us as needing
1182 * recovery. However, we need to send it *before* dropping the
1183 * super block lock as otherwise their recovery threads might
1184 * try to clean us up while we're live! */
1185 status = ocfs2_request_mount_vote(osb);
1191 ocfs2_super_unlock(osb, 1);
1197 /* we can't grab the goofy sem lock from inside wait_event, so we use
1198 * memory barriers to make sure that we'll see the null task before
1200 static int ocfs2_recovery_thread_running(struct ocfs2_super *osb)
1203 return osb->recovery_thread_task != NULL;
1206 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1209 struct ocfs2_super *osb = NULL;
1212 mlog_entry("(0x%p)\n", sb);
1218 ocfs2_shutdown_local_alloc(osb);
1220 ocfs2_truncate_log_shutdown(osb);
1222 /* disable any new recovery threads and wait for any currently
1223 * running ones to exit. Do this before setting the vol_state. */
1224 mutex_lock(&osb->recovery_lock);
1225 osb->disable_recovery = 1;
1226 mutex_unlock(&osb->recovery_lock);
1227 wait_event(osb->recovery_event, !ocfs2_recovery_thread_running(osb));
1229 /* At this point, we know that no more recovery threads can be
1230 * launched, so wait for any recovery completion work to
1232 flush_workqueue(ocfs2_wq);
1234 ocfs2_journal_shutdown(osb);
1236 ocfs2_sync_blockdev(sb);
1238 /* No dlm means we've failed during mount, so skip all the
1239 * steps which depended on that to complete. */
1241 tmp = ocfs2_super_lock(osb, 1);
1247 tmp = ocfs2_request_umount_vote(osb);
1252 if (osb->slot_num != OCFS2_INVALID_SLOT)
1253 ocfs2_put_slot(osb);
1256 ocfs2_super_unlock(osb, 1);
1258 ocfs2_release_system_inodes(osb);
1261 ocfs2_unregister_net_handlers(osb);
1263 ocfs2_dlm_shutdown(osb);
1266 ocfs2_clear_hb_callbacks(osb);
1268 debugfs_remove(osb->osb_debug_root);
1271 ocfs2_stop_heartbeat(osb);
1273 atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1275 if (ocfs2_mount_local(osb))
1276 snprintf(nodestr, sizeof(nodestr), "local");
1278 snprintf(nodestr, sizeof(nodestr), "%d", osb->node_num);
1280 printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1281 osb->dev_str, nodestr);
1283 ocfs2_delete_osb(osb);
1286 sb->s_fs_info = NULL;
1289 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1290 unsigned uuid_bytes)
1295 BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1297 osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1298 if (osb->uuid_str == NULL)
1301 for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1302 /* print with null */
1303 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1304 if (ret != 2) /* drop super cleans up */
1306 /* then only advance past the last char */
1313 static int ocfs2_initialize_super(struct super_block *sb,
1314 struct buffer_head *bh,
1318 int i, cbits, bbits;
1319 struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1320 struct inode *inode = NULL;
1321 struct buffer_head *bitmap_bh = NULL;
1322 struct ocfs2_journal *journal;
1323 __le32 uuid_net_key;
1324 struct ocfs2_super *osb;
1328 osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1335 sb->s_fs_info = osb;
1336 sb->s_op = &ocfs2_sops;
1337 sb->s_export_op = &ocfs2_export_ops;
1338 sb->s_time_gran = 1;
1339 sb->s_flags |= MS_NOATIME;
1340 /* this is needed to support O_LARGEFILE */
1341 cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1342 bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1343 sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1346 /* Save off for ocfs2_rw_direct */
1347 osb->s_sectsize_bits = blksize_bits(sector_size);
1348 BUG_ON(!osb->s_sectsize_bits);
1350 osb->net_response_ids = 0;
1351 spin_lock_init(&osb->net_response_lock);
1352 INIT_LIST_HEAD(&osb->net_response_list);
1354 INIT_LIST_HEAD(&osb->osb_net_handlers);
1355 init_waitqueue_head(&osb->recovery_event);
1356 spin_lock_init(&osb->vote_task_lock);
1357 init_waitqueue_head(&osb->vote_event);
1358 osb->vote_work_sequence = 0;
1359 osb->vote_wake_sequence = 0;
1360 INIT_LIST_HEAD(&osb->blocked_lock_list);
1361 osb->blocked_lock_count = 0;
1362 INIT_LIST_HEAD(&osb->vote_list);
1363 spin_lock_init(&osb->osb_lock);
1365 atomic_set(&osb->alloc_stats.moves, 0);
1366 atomic_set(&osb->alloc_stats.local_data, 0);
1367 atomic_set(&osb->alloc_stats.bitmap_data, 0);
1368 atomic_set(&osb->alloc_stats.bg_allocs, 0);
1369 atomic_set(&osb->alloc_stats.bg_extends, 0);
1371 ocfs2_init_node_maps(osb);
1373 snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1374 MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1376 mutex_init(&osb->recovery_lock);
1378 osb->disable_recovery = 0;
1379 osb->recovery_thread_task = NULL;
1381 init_waitqueue_head(&osb->checkpoint_event);
1382 atomic_set(&osb->needs_checkpoint, 0);
1384 osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1386 osb->node_num = O2NM_INVALID_NODE_NUM;
1387 osb->slot_num = OCFS2_INVALID_SLOT;
1389 osb->local_alloc_state = OCFS2_LA_UNUSED;
1390 osb->local_alloc_bh = NULL;
1392 ocfs2_setup_hb_callbacks(osb);
1394 init_waitqueue_head(&osb->osb_mount_event);
1396 osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1397 if (!osb->vol_label) {
1398 mlog(ML_ERROR, "unable to alloc vol label\n");
1403 osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1404 if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1405 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1410 mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1412 init_waitqueue_head(&osb->osb_wipe_event);
1413 osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1414 sizeof(*osb->osb_orphan_wipes),
1416 if (!osb->osb_orphan_wipes) {
1422 osb->s_feature_compat =
1423 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1424 osb->s_feature_ro_compat =
1425 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1426 osb->s_feature_incompat =
1427 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1429 if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1430 mlog(ML_ERROR, "couldn't mount because of unsupported "
1431 "optional features (%x).\n", i);
1435 if (!(osb->sb->s_flags & MS_RDONLY) &&
1436 (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1437 mlog(ML_ERROR, "couldn't mount RDWR because of "
1438 "unsupported optional features (%x).\n", i);
1443 get_random_bytes(&osb->s_next_generation, sizeof(u32));
1446 * This should be done in ocfs2_journal_init(), but unknown
1447 * ordering issues will cause the filesystem to crash.
1448 * If anyone wants to figure out what part of the code
1449 * refers to osb->journal before ocfs2_journal_init() is run,
1452 /* initialize our journal structure */
1454 journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1456 mlog(ML_ERROR, "unable to alloc journal\n");
1460 osb->journal = journal;
1461 journal->j_osb = osb;
1463 atomic_set(&journal->j_num_trans, 0);
1464 init_rwsem(&journal->j_trans_barrier);
1465 init_waitqueue_head(&journal->j_checkpointed);
1466 spin_lock_init(&journal->j_lock);
1467 journal->j_trans_id = (unsigned long) 1;
1468 INIT_LIST_HEAD(&journal->j_la_cleanups);
1469 INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1470 journal->j_state = OCFS2_JOURNAL_FREE;
1472 /* get some pseudo constants for clustersize bits */
1473 osb->s_clustersize_bits =
1474 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1475 osb->s_clustersize = 1 << osb->s_clustersize_bits;
1476 mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1478 if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1479 osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1480 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1481 osb->s_clustersize);
1486 if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1488 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1489 "what jbd can address in 32 bits.\n");
1494 if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1495 sizeof(di->id2.i_super.s_uuid))) {
1496 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1501 memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1502 osb->net_key = le32_to_cpu(uuid_net_key);
1504 strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1505 osb->vol_label[63] = '\0';
1506 osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1507 osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1508 osb->first_cluster_group_blkno =
1509 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1510 osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1511 mlog(0, "vol_label: %s\n", osb->vol_label);
1512 mlog(0, "uuid: %s\n", osb->uuid_str);
1513 mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1514 (unsigned long long)osb->root_blkno,
1515 (unsigned long long)osb->system_dir_blkno);
1517 osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1518 if (!osb->osb_dlm_debug) {
1524 atomic_set(&osb->vol_state, VOLUME_INIT);
1526 /* load root, system_dir, and all global system inodes */
1527 status = ocfs2_init_global_system_inodes(osb);
1536 inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1537 OCFS2_INVALID_SLOT);
1544 osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1546 /* We don't have a cluster lock on the bitmap here because
1547 * we're only interested in static information and the extra
1548 * complexity at mount time isn't worht it. Don't pass the
1549 * inode in to the read function though as we don't want it to
1550 * be put in the cache. */
1551 status = ocfs2_read_block(osb, osb->bitmap_blkno, &bitmap_bh, 0,
1559 di = (struct ocfs2_dinode *) bitmap_bh->b_data;
1560 osb->bitmap_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
1562 mlog(0, "cluster bitmap inode: %llu, clusters per group: %u\n",
1563 (unsigned long long)osb->bitmap_blkno, osb->bitmap_cpg);
1565 status = ocfs2_init_slot_info(osb);
1577 * will return: -EAGAIN if it is ok to keep searching for superblocks
1578 * -EINVAL if there is a bad superblock
1581 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1582 struct buffer_head *bh,
1585 int status = -EAGAIN;
1589 if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1590 strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1592 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1593 mlog(ML_ERROR, "found superblock with incorrect block "
1594 "size: found %u, should be %u\n",
1595 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1597 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1598 OCFS2_MAJOR_REV_LEVEL ||
1599 le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1600 OCFS2_MINOR_REV_LEVEL) {
1601 mlog(ML_ERROR, "found superblock with bad version: "
1602 "found %u.%u, should be %u.%u\n",
1603 le16_to_cpu(di->id2.i_super.s_major_rev_level),
1604 le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1605 OCFS2_MAJOR_REV_LEVEL,
1606 OCFS2_MINOR_REV_LEVEL);
1607 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1608 mlog(ML_ERROR, "bad block number on superblock: "
1609 "found %llu, should be %llu\n",
1610 (unsigned long long)le64_to_cpu(di->i_blkno),
1611 (unsigned long long)bh->b_blocknr);
1612 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1613 le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1614 mlog(ML_ERROR, "bad cluster size found: %u\n",
1615 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1616 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1617 mlog(ML_ERROR, "bad root_blkno: 0\n");
1618 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1619 mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1620 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1622 "Superblock slots found greater than file system "
1623 "maximum: found %u, max %u\n",
1624 le16_to_cpu(di->id2.i_super.s_max_slots),
1636 static int ocfs2_check_volume(struct ocfs2_super *osb)
1641 struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1647 /* Init our journal object. */
1648 status = ocfs2_journal_init(osb->journal, &dirty);
1650 mlog(ML_ERROR, "Could not initialize journal!\n");
1654 /* If the journal was unmounted cleanly then we don't want to
1655 * recover anything. Otherwise, journal_load will do that
1656 * dirty work for us :) */
1658 status = ocfs2_journal_wipe(osb->journal, 0);
1664 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1665 "recovering volume.\n");
1668 local = ocfs2_mount_local(osb);
1670 /* will play back anything left in the journal. */
1671 ocfs2_journal_load(osb->journal, local);
1674 /* recover my local alloc if we didn't unmount cleanly. */
1675 status = ocfs2_begin_local_alloc_recovery(osb,
1682 /* we complete the recovery process after we've marked
1683 * ourselves as mounted. */
1686 mlog(0, "Journal loaded.\n");
1688 status = ocfs2_load_local_alloc(osb);
1695 /* Recovery will be completed after we've mounted the
1696 * rest of the volume. */
1698 osb->local_alloc_copy = local_alloc;
1702 /* go through each journal, trylock it and if you get the
1703 * lock, and it's marked as dirty, set the bit in the recover
1704 * map and launch a recovery thread for it. */
1705 status = ocfs2_mark_dead_nodes(osb);
1718 * The routine gets called from dismount or close whenever a dismount on
1719 * volume is requested and the osb open count becomes 1.
1720 * It will remove the osb from the global list and also free up all the
1721 * initialized resources and fileobject.
1723 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1727 /* This function assumes that the caller has the main osb resource */
1730 ocfs2_free_slot_info(osb->slot_info);
1732 kfree(osb->osb_orphan_wipes);
1734 * This belongs in journal shutdown, but because we have to
1735 * allocate osb->journal at the start of ocfs2_initalize_osb(),
1738 kfree(osb->journal);
1739 if (osb->local_alloc_copy)
1740 kfree(osb->local_alloc_copy);
1741 kfree(osb->uuid_str);
1742 ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1743 memset(osb, 0, sizeof(struct ocfs2_super));
1748 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1749 * panic(). We do not support continue-on-error operation. */
1750 static void ocfs2_handle_error(struct super_block *sb)
1752 struct ocfs2_super *osb = OCFS2_SB(sb);
1754 if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1755 panic("OCFS2: (device %s): panic forced after error\n",
1758 ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1760 if (sb->s_flags & MS_RDONLY &&
1761 (ocfs2_is_soft_readonly(osb) ||
1762 ocfs2_is_hard_readonly(osb)))
1765 printk(KERN_CRIT "File system is now read-only due to the potential "
1766 "of on-disk corruption. Please run fsck.ocfs2 once the file "
1767 "system is unmounted.\n");
1768 sb->s_flags |= MS_RDONLY;
1769 ocfs2_set_ro_flag(osb, 0);
1772 static char error_buf[1024];
1774 void __ocfs2_error(struct super_block *sb,
1775 const char *function,
1776 const char *fmt, ...)
1780 va_start(args, fmt);
1781 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1784 /* Not using mlog here because we want to show the actual
1785 * function the error came from. */
1786 printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1787 sb->s_id, function, error_buf);
1789 ocfs2_handle_error(sb);
1792 /* Handle critical errors. This is intentionally more drastic than
1793 * ocfs2_handle_error, so we only use for things like journal errors,
1795 void __ocfs2_abort(struct super_block* sb,
1796 const char *function,
1797 const char *fmt, ...)
1801 va_start(args, fmt);
1802 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1805 printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1806 sb->s_id, function, error_buf);
1808 /* We don't have the cluster support yet to go straight to
1809 * hard readonly in here. Until then, we want to keep
1810 * ocfs2_abort() so that we can at least mark critical
1813 * TODO: This should abort the journal and alert other nodes
1814 * that our slot needs recovery. */
1816 /* Force a panic(). This stinks, but it's better than letting
1817 * things continue without having a proper hard readonly
1819 OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1820 ocfs2_handle_error(sb);
1823 module_init(ocfs2_init);
1824 module_exit(ocfs2_exit);