Root/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/init.h>
32#include <linux/random.h>
33#include <linux/statfs.h>
34#include <linux/moduleparam.h>
35#include <linux/blkdev.h>
36#include <linux/socket.h>
37#include <linux/inet.h>
38#include <linux/parser.h>
39#include <linux/crc32.h>
40#include <linux/debugfs.h>
41#include <linux/mount.h>
42#include <linux/seq_file.h>
43#include <linux/quotaops.h>
44#include <linux/cleancache.h>
45
46#define CREATE_TRACE_POINTS
47#include "ocfs2_trace.h"
48
49#include <cluster/masklog.h>
50
51#include "ocfs2.h"
52
53/* this should be the only file to include a version 1 header */
54#include "ocfs1_fs_compat.h"
55
56#include "alloc.h"
57#include "blockcheck.h"
58#include "dlmglue.h"
59#include "export.h"
60#include "extent_map.h"
61#include "heartbeat.h"
62#include "inode.h"
63#include "journal.h"
64#include "localalloc.h"
65#include "namei.h"
66#include "slot_map.h"
67#include "super.h"
68#include "sysfile.h"
69#include "uptodate.h"
70#include "ver.h"
71#include "xattr.h"
72#include "quota.h"
73#include "refcounttree.h"
74#include "suballoc.h"
75
76#include "buffer_head_io.h"
77
78static struct kmem_cache *ocfs2_inode_cachep = NULL;
79struct kmem_cache *ocfs2_dquot_cachep;
80struct kmem_cache *ocfs2_qf_chunk_cachep;
81
82/* OCFS2 needs to schedule several different 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. */
86struct workqueue_struct *ocfs2_wq = NULL;
87
88static struct dentry *ocfs2_debugfs_root = NULL;
89
90MODULE_AUTHOR("Oracle");
91MODULE_LICENSE("GPL");
92
93struct mount_options
94{
95    unsigned long commit_interval;
96    unsigned long mount_opt;
97    unsigned int atime_quantum;
98    signed short slot;
99    int localalloc_opt;
100    unsigned int resv_level;
101    int dir_resv_level;
102    char cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
103};
104
105static int ocfs2_parse_options(struct super_block *sb, char *options,
106                   struct mount_options *mopt,
107                   int is_remount);
108static int ocfs2_check_set_options(struct super_block *sb,
109                   struct mount_options *options);
110static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
111static void ocfs2_put_super(struct super_block *sb);
112static int ocfs2_mount_volume(struct super_block *sb);
113static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
114static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
115static int ocfs2_initialize_mem_caches(void);
116static void ocfs2_free_mem_caches(void);
117static void ocfs2_delete_osb(struct ocfs2_super *osb);
118
119static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
120
121static int ocfs2_sync_fs(struct super_block *sb, int wait);
122
123static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
124static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
125static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
126static int ocfs2_check_volume(struct ocfs2_super *osb);
127static int ocfs2_verify_volume(struct ocfs2_dinode *di,
128                   struct buffer_head *bh,
129                   u32 sectsize,
130                   struct ocfs2_blockcheck_stats *stats);
131static int ocfs2_initialize_super(struct super_block *sb,
132                  struct buffer_head *bh,
133                  int sector_size,
134                  struct ocfs2_blockcheck_stats *stats);
135static int ocfs2_get_sector(struct super_block *sb,
136                struct buffer_head **bh,
137                int block,
138                int sect_size);
139static struct inode *ocfs2_alloc_inode(struct super_block *sb);
140static void ocfs2_destroy_inode(struct inode *inode);
141static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend);
142static int ocfs2_enable_quotas(struct ocfs2_super *osb);
143static void ocfs2_disable_quotas(struct ocfs2_super *osb);
144
145static const struct super_operations ocfs2_sops = {
146    .statfs = ocfs2_statfs,
147    .alloc_inode = ocfs2_alloc_inode,
148    .destroy_inode = ocfs2_destroy_inode,
149    .drop_inode = ocfs2_drop_inode,
150    .evict_inode = ocfs2_evict_inode,
151    .sync_fs = ocfs2_sync_fs,
152    .put_super = ocfs2_put_super,
153    .remount_fs = ocfs2_remount,
154    .show_options = ocfs2_show_options,
155    .quota_read = ocfs2_quota_read,
156    .quota_write = ocfs2_quota_write,
157};
158
159enum {
160    Opt_barrier,
161    Opt_err_panic,
162    Opt_err_ro,
163    Opt_intr,
164    Opt_nointr,
165    Opt_hb_none,
166    Opt_hb_local,
167    Opt_hb_global,
168    Opt_data_ordered,
169    Opt_data_writeback,
170    Opt_atime_quantum,
171    Opt_slot,
172    Opt_commit,
173    Opt_localalloc,
174    Opt_localflocks,
175    Opt_stack,
176    Opt_user_xattr,
177    Opt_nouser_xattr,
178    Opt_inode64,
179    Opt_acl,
180    Opt_noacl,
181    Opt_usrquota,
182    Opt_grpquota,
183    Opt_coherency_buffered,
184    Opt_coherency_full,
185    Opt_resv_level,
186    Opt_dir_resv_level,
187    Opt_err,
188};
189
190static const match_table_t tokens = {
191    {Opt_barrier, "barrier=%u"},
192    {Opt_err_panic, "errors=panic"},
193    {Opt_err_ro, "errors=remount-ro"},
194    {Opt_intr, "intr"},
195    {Opt_nointr, "nointr"},
196    {Opt_hb_none, OCFS2_HB_NONE},
197    {Opt_hb_local, OCFS2_HB_LOCAL},
198    {Opt_hb_global, OCFS2_HB_GLOBAL},
199    {Opt_data_ordered, "data=ordered"},
200    {Opt_data_writeback, "data=writeback"},
201    {Opt_atime_quantum, "atime_quantum=%u"},
202    {Opt_slot, "preferred_slot=%u"},
203    {Opt_commit, "commit=%u"},
204    {Opt_localalloc, "localalloc=%d"},
205    {Opt_localflocks, "localflocks"},
206    {Opt_stack, "cluster_stack=%s"},
207    {Opt_user_xattr, "user_xattr"},
208    {Opt_nouser_xattr, "nouser_xattr"},
209    {Opt_inode64, "inode64"},
210    {Opt_acl, "acl"},
211    {Opt_noacl, "noacl"},
212    {Opt_usrquota, "usrquota"},
213    {Opt_grpquota, "grpquota"},
214    {Opt_coherency_buffered, "coherency=buffered"},
215    {Opt_coherency_full, "coherency=full"},
216    {Opt_resv_level, "resv_level=%u"},
217    {Opt_dir_resv_level, "dir_resv_level=%u"},
218    {Opt_err, NULL}
219};
220
221#ifdef CONFIG_DEBUG_FS
222static int ocfs2_osb_dump(struct ocfs2_super *osb, char *buf, int len)
223{
224    struct ocfs2_cluster_connection *cconn = osb->cconn;
225    struct ocfs2_recovery_map *rm = osb->recovery_map;
226    struct ocfs2_orphan_scan *os = &osb->osb_orphan_scan;
227    int i, out = 0;
228
229    out += snprintf(buf + out, len - out,
230            "%10s => Id: %-s Uuid: %-s Gen: 0x%X Label: %-s\n",
231            "Device", osb->dev_str, osb->uuid_str,
232            osb->fs_generation, osb->vol_label);
233
234    out += snprintf(buf + out, len - out,
235            "%10s => State: %d Flags: 0x%lX\n", "Volume",
236            atomic_read(&osb->vol_state), osb->osb_flags);
237
238    out += snprintf(buf + out, len - out,
239            "%10s => Block: %lu Cluster: %d\n", "Sizes",
240            osb->sb->s_blocksize, osb->s_clustersize);
241
242    out += snprintf(buf + out, len - out,
243            "%10s => Compat: 0x%X Incompat: 0x%X "
244            "ROcompat: 0x%X\n",
245            "Features", osb->s_feature_compat,
246            osb->s_feature_incompat, osb->s_feature_ro_compat);
247
248    out += snprintf(buf + out, len - out,
249            "%10s => Opts: 0x%lX AtimeQuanta: %u\n", "Mount",
250            osb->s_mount_opt, osb->s_atime_quantum);
251
252    if (cconn) {
253        out += snprintf(buf + out, len - out,
254                "%10s => Stack: %s Name: %*s "
255                "Version: %d.%d\n", "Cluster",
256                (*osb->osb_cluster_stack == '\0' ?
257                 "o2cb" : osb->osb_cluster_stack),
258                cconn->cc_namelen, cconn->cc_name,
259                cconn->cc_version.pv_major,
260                cconn->cc_version.pv_minor);
261    }
262
263    spin_lock(&osb->dc_task_lock);
264    out += snprintf(buf + out, len - out,
265            "%10s => Pid: %d Count: %lu WakeSeq: %lu "
266            "WorkSeq: %lu\n", "DownCnvt",
267            (osb->dc_task ? task_pid_nr(osb->dc_task) : -1),
268            osb->blocked_lock_count, osb->dc_wake_sequence,
269            osb->dc_work_sequence);
270    spin_unlock(&osb->dc_task_lock);
271
272    spin_lock(&osb->osb_lock);
273    out += snprintf(buf + out, len - out, "%10s => Pid: %d Nodes:",
274            "Recovery",
275            (osb->recovery_thread_task ?
276             task_pid_nr(osb->recovery_thread_task) : -1));
277    if (rm->rm_used == 0)
278        out += snprintf(buf + out, len - out, " None\n");
279    else {
280        for (i = 0; i < rm->rm_used; i++)
281            out += snprintf(buf + out, len - out, " %d",
282                    rm->rm_entries[i]);
283        out += snprintf(buf + out, len - out, "\n");
284    }
285    spin_unlock(&osb->osb_lock);
286
287    out += snprintf(buf + out, len - out,
288            "%10s => Pid: %d Interval: %lu Needs: %d\n", "Commit",
289            (osb->commit_task ? task_pid_nr(osb->commit_task) : -1),
290            osb->osb_commit_interval,
291            atomic_read(&osb->needs_checkpoint));
292
293    out += snprintf(buf + out, len - out,
294            "%10s => State: %d TxnId: %lu NumTxns: %d\n",
295            "Journal", osb->journal->j_state,
296            osb->journal->j_trans_id,
297            atomic_read(&osb->journal->j_num_trans));
298
299    out += snprintf(buf + out, len - out,
300            "%10s => GlobalAllocs: %d LocalAllocs: %d "
301            "SubAllocs: %d LAWinMoves: %d SAExtends: %d\n",
302            "Stats",
303            atomic_read(&osb->alloc_stats.bitmap_data),
304            atomic_read(&osb->alloc_stats.local_data),
305            atomic_read(&osb->alloc_stats.bg_allocs),
306            atomic_read(&osb->alloc_stats.moves),
307            atomic_read(&osb->alloc_stats.bg_extends));
308
309    out += snprintf(buf + out, len - out,
310            "%10s => State: %u Descriptor: %llu Size: %u bits "
311            "Default: %u bits\n",
312            "LocalAlloc", osb->local_alloc_state,
313            (unsigned long long)osb->la_last_gd,
314            osb->local_alloc_bits, osb->local_alloc_default_bits);
315
316    spin_lock(&osb->osb_lock);
317    out += snprintf(buf + out, len - out,
318            "%10s => InodeSlot: %d StolenInodes: %d, "
319            "MetaSlot: %d StolenMeta: %d\n", "Steal",
320            osb->s_inode_steal_slot,
321            atomic_read(&osb->s_num_inodes_stolen),
322            osb->s_meta_steal_slot,
323            atomic_read(&osb->s_num_meta_stolen));
324    spin_unlock(&osb->osb_lock);
325
326    out += snprintf(buf + out, len - out, "OrphanScan => ");
327    out += snprintf(buf + out, len - out, "Local: %u Global: %u ",
328            os->os_count, os->os_seqno);
329    out += snprintf(buf + out, len - out, " Last Scan: ");
330    if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
331        out += snprintf(buf + out, len - out, "Disabled\n");
332    else
333        out += snprintf(buf + out, len - out, "%lu seconds ago\n",
334                (get_seconds() - os->os_scantime.tv_sec));
335
336    out += snprintf(buf + out, len - out, "%10s => %3s %10s\n",
337            "Slots", "Num", "RecoGen");
338    for (i = 0; i < osb->max_slots; ++i) {
339        out += snprintf(buf + out, len - out,
340                "%10s %c %3d %10d\n",
341                " ",
342                (i == osb->slot_num ? '*' : ' '),
343                i, osb->slot_recovery_generations[i]);
344    }
345
346    return out;
347}
348
349static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
350{
351    struct ocfs2_super *osb = inode->i_private;
352    char *buf = NULL;
353
354    buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
355    if (!buf)
356        goto bail;
357
358    i_size_write(inode, ocfs2_osb_dump(osb, buf, PAGE_SIZE));
359
360    file->private_data = buf;
361
362    return 0;
363bail:
364    return -ENOMEM;
365}
366
367static int ocfs2_debug_release(struct inode *inode, struct file *file)
368{
369    kfree(file->private_data);
370    return 0;
371}
372
373static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
374                size_t nbytes, loff_t *ppos)
375{
376    return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
377                       i_size_read(file->f_mapping->host));
378}
379#else
380static int ocfs2_osb_debug_open(struct inode *inode, struct file *file)
381{
382    return 0;
383}
384static int ocfs2_debug_release(struct inode *inode, struct file *file)
385{
386    return 0;
387}
388static ssize_t ocfs2_debug_read(struct file *file, char __user *buf,
389                size_t nbytes, loff_t *ppos)
390{
391    return 0;
392}
393#endif /* CONFIG_DEBUG_FS */
394
395static const struct file_operations ocfs2_osb_debug_fops = {
396    .open = ocfs2_osb_debug_open,
397    .release = ocfs2_debug_release,
398    .read = ocfs2_debug_read,
399    .llseek = generic_file_llseek,
400};
401
402static int ocfs2_sync_fs(struct super_block *sb, int wait)
403{
404    int status;
405    tid_t target;
406    struct ocfs2_super *osb = OCFS2_SB(sb);
407
408    if (ocfs2_is_hard_readonly(osb))
409        return -EROFS;
410
411    if (wait) {
412        status = ocfs2_flush_truncate_log(osb);
413        if (status < 0)
414            mlog_errno(status);
415    } else {
416        ocfs2_schedule_truncate_log_flush(osb, 0);
417    }
418
419    if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
420                      &target)) {
421        if (wait)
422            jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
423                         target);
424    }
425    return 0;
426}
427
428static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
429{
430    if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
431        && (ino == USER_QUOTA_SYSTEM_INODE
432        || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
433        return 0;
434    if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
435        && (ino == GROUP_QUOTA_SYSTEM_INODE
436        || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
437        return 0;
438    return 1;
439}
440
441static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
442{
443    struct inode *new = NULL;
444    int status = 0;
445    int i;
446
447    new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
448    if (IS_ERR(new)) {
449        status = PTR_ERR(new);
450        mlog_errno(status);
451        goto bail;
452    }
453    osb->root_inode = new;
454
455    new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
456    if (IS_ERR(new)) {
457        status = PTR_ERR(new);
458        mlog_errno(status);
459        goto bail;
460    }
461    osb->sys_root_inode = new;
462
463    for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
464         i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
465        if (!ocfs2_need_system_inode(osb, i))
466            continue;
467        new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
468        if (!new) {
469            ocfs2_release_system_inodes(osb);
470            status = -EINVAL;
471            mlog_errno(status);
472            /* FIXME: Should ERROR_RO_FS */
473            mlog(ML_ERROR, "Unable to load system inode %d, "
474                 "possibly corrupt fs?", i);
475            goto bail;
476        }
477        // the array now has one ref, so drop this one
478        iput(new);
479    }
480
481bail:
482    if (status)
483        mlog_errno(status);
484    return status;
485}
486
487static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
488{
489    struct inode *new = NULL;
490    int status = 0;
491    int i;
492
493    for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
494         i < NUM_SYSTEM_INODES;
495         i++) {
496        if (!ocfs2_need_system_inode(osb, i))
497            continue;
498        new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
499        if (!new) {
500            ocfs2_release_system_inodes(osb);
501            status = -EINVAL;
502            mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
503                 status, i, osb->slot_num);
504            goto bail;
505        }
506        /* the array now has one ref, so drop this one */
507        iput(new);
508    }
509
510bail:
511    if (status)
512        mlog_errno(status);
513    return status;
514}
515
516static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
517{
518    int i;
519    struct inode *inode;
520
521    for (i = 0; i < NUM_GLOBAL_SYSTEM_INODES; i++) {
522        inode = osb->global_system_inodes[i];
523        if (inode) {
524            iput(inode);
525            osb->global_system_inodes[i] = NULL;
526        }
527    }
528
529    inode = osb->sys_root_inode;
530    if (inode) {
531        iput(inode);
532        osb->sys_root_inode = NULL;
533    }
534
535    inode = osb->root_inode;
536    if (inode) {
537        iput(inode);
538        osb->root_inode = NULL;
539    }
540
541    if (!osb->local_system_inodes)
542        return;
543
544    for (i = 0; i < NUM_LOCAL_SYSTEM_INODES * osb->max_slots; i++) {
545        if (osb->local_system_inodes[i]) {
546            iput(osb->local_system_inodes[i]);
547            osb->local_system_inodes[i] = NULL;
548        }
549    }
550
551    kfree(osb->local_system_inodes);
552    osb->local_system_inodes = NULL;
553}
554
555/* We're allocating fs objects, use GFP_NOFS */
556static struct inode *ocfs2_alloc_inode(struct super_block *sb)
557{
558    struct ocfs2_inode_info *oi;
559
560    oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
561    if (!oi)
562        return NULL;
563
564    jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
565    return &oi->vfs_inode;
566}
567
568static void ocfs2_i_callback(struct rcu_head *head)
569{
570    struct inode *inode = container_of(head, struct inode, i_rcu);
571    INIT_LIST_HEAD(&inode->i_dentry);
572    kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
573}
574
575static void ocfs2_destroy_inode(struct inode *inode)
576{
577    call_rcu(&inode->i_rcu, ocfs2_i_callback);
578}
579
580static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
581                        unsigned int cbits)
582{
583    unsigned int bytes = 1 << cbits;
584    unsigned int trim = bytes;
585    unsigned int bitshift = 32;
586
587    /*
588     * i_size and all block offsets in ocfs2 are always 64 bits
589     * wide. i_clusters is 32 bits, in cluster-sized units. So on
590     * 64 bit platforms, cluster size will be the limiting factor.
591     */
592
593#if BITS_PER_LONG == 32
594# if defined(CONFIG_LBDAF)
595    BUILD_BUG_ON(sizeof(sector_t) != 8);
596    /*
597     * We might be limited by page cache size.
598     */
599    if (bytes > PAGE_CACHE_SIZE) {
600        bytes = PAGE_CACHE_SIZE;
601        trim = 1;
602        /*
603         * Shift by 31 here so that we don't get larger than
604         * MAX_LFS_FILESIZE
605         */
606        bitshift = 31;
607    }
608# else
609    /*
610     * We are limited by the size of sector_t. Use block size, as
611     * that's what we expose to the VFS.
612     */
613    bytes = 1 << bbits;
614    trim = 1;
615    bitshift = 31;
616# endif
617#endif
618
619    /*
620     * Trim by a whole cluster when we can actually approach the
621     * on-disk limits. Otherwise we can overflow i_clusters when
622     * an extent start is at the max offset.
623     */
624    return (((unsigned long long)bytes) << bitshift) - trim;
625}
626
627static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
628{
629    int incompat_features;
630    int ret = 0;
631    struct mount_options parsed_options;
632    struct ocfs2_super *osb = OCFS2_SB(sb);
633    u32 tmp;
634
635    if (!ocfs2_parse_options(sb, data, &parsed_options, 1) ||
636        !ocfs2_check_set_options(sb, &parsed_options)) {
637        ret = -EINVAL;
638        goto out;
639    }
640
641    tmp = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL |
642        OCFS2_MOUNT_HB_NONE;
643    if ((osb->s_mount_opt & tmp) != (parsed_options.mount_opt & tmp)) {
644        ret = -EINVAL;
645        mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
646        goto out;
647    }
648
649    if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
650        (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
651        ret = -EINVAL;
652        mlog(ML_ERROR, "Cannot change data mode on remount\n");
653        goto out;
654    }
655
656    /* Probably don't want this on remount; it might
657     * mess with other nodes */
658    if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
659        (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
660        ret = -EINVAL;
661        mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
662        goto out;
663    }
664
665    /* We're going to/from readonly mode. */
666    if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
667        /* Disable quota accounting before remounting RO */
668        if (*flags & MS_RDONLY) {
669            ret = ocfs2_susp_quotas(osb, 0);
670            if (ret < 0)
671                goto out;
672        }
673        /* Lock here so the check of HARD_RO and the potential
674         * setting of SOFT_RO is atomic. */
675        spin_lock(&osb->osb_lock);
676        if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
677            mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
678            ret = -EROFS;
679            goto unlock_osb;
680        }
681
682        if (*flags & MS_RDONLY) {
683            sb->s_flags |= MS_RDONLY;
684            osb->osb_flags |= OCFS2_OSB_SOFT_RO;
685        } else {
686            if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
687                mlog(ML_ERROR, "Cannot remount RDWR "
688                     "filesystem due to previous errors.\n");
689                ret = -EROFS;
690                goto unlock_osb;
691            }
692            incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
693            if (incompat_features) {
694                mlog(ML_ERROR, "Cannot remount RDWR because "
695                     "of unsupported optional features "
696                     "(%x).\n", incompat_features);
697                ret = -EINVAL;
698                goto unlock_osb;
699            }
700            sb->s_flags &= ~MS_RDONLY;
701            osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
702        }
703        trace_ocfs2_remount(sb->s_flags, osb->osb_flags, *flags);
704unlock_osb:
705        spin_unlock(&osb->osb_lock);
706        /* Enable quota accounting after remounting RW */
707        if (!ret && !(*flags & MS_RDONLY)) {
708            if (sb_any_quota_suspended(sb))
709                ret = ocfs2_susp_quotas(osb, 1);
710            else
711                ret = ocfs2_enable_quotas(osb);
712            if (ret < 0) {
713                /* Return back changes... */
714                spin_lock(&osb->osb_lock);
715                sb->s_flags |= MS_RDONLY;
716                osb->osb_flags |= OCFS2_OSB_SOFT_RO;
717                spin_unlock(&osb->osb_lock);
718                goto out;
719            }
720        }
721    }
722
723    if (!ret) {
724        /* Only save off the new mount options in case of a successful
725         * remount. */
726        osb->s_mount_opt = parsed_options.mount_opt;
727        osb->s_atime_quantum = parsed_options.atime_quantum;
728        osb->preferred_slot = parsed_options.slot;
729        if (parsed_options.commit_interval)
730            osb->osb_commit_interval = parsed_options.commit_interval;
731
732        if (!ocfs2_is_hard_readonly(osb))
733            ocfs2_set_journal_params(osb);
734
735        sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
736            ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ?
737                            MS_POSIXACL : 0);
738    }
739out:
740    return ret;
741}
742
743static int ocfs2_sb_probe(struct super_block *sb,
744              struct buffer_head **bh,
745              int *sector_size,
746              struct ocfs2_blockcheck_stats *stats)
747{
748    int status, tmpstat;
749    struct ocfs1_vol_disk_hdr *hdr;
750    struct ocfs2_dinode *di;
751    int blksize;
752
753    *bh = NULL;
754
755    /* may be > 512 */
756    *sector_size = bdev_logical_block_size(sb->s_bdev);
757    if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
758        mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
759             *sector_size, OCFS2_MAX_BLOCKSIZE);
760        status = -EINVAL;
761        goto bail;
762    }
763
764    /* Can this really happen? */
765    if (*sector_size < OCFS2_MIN_BLOCKSIZE)
766        *sector_size = OCFS2_MIN_BLOCKSIZE;
767
768    /* check block zero for old format */
769    status = ocfs2_get_sector(sb, bh, 0, *sector_size);
770    if (status < 0) {
771        mlog_errno(status);
772        goto bail;
773    }
774    hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
775    if (hdr->major_version == OCFS1_MAJOR_VERSION) {
776        mlog(ML_ERROR, "incompatible version: %u.%u\n",
777             hdr->major_version, hdr->minor_version);
778        status = -EINVAL;
779    }
780    if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
781           strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
782        mlog(ML_ERROR, "incompatible volume signature: %8s\n",
783             hdr->signature);
784        status = -EINVAL;
785    }
786    brelse(*bh);
787    *bh = NULL;
788    if (status < 0) {
789        mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
790             "upgraded before mounting with ocfs v2\n");
791        goto bail;
792    }
793
794    /*
795     * Now check at magic offset for 512, 1024, 2048, 4096
796     * blocksizes. 4096 is the maximum blocksize because it is
797     * the minimum clustersize.
798     */
799    status = -EINVAL;
800    for (blksize = *sector_size;
801         blksize <= OCFS2_MAX_BLOCKSIZE;
802         blksize <<= 1) {
803        tmpstat = ocfs2_get_sector(sb, bh,
804                       OCFS2_SUPER_BLOCK_BLKNO,
805                       blksize);
806        if (tmpstat < 0) {
807            status = tmpstat;
808            mlog_errno(status);
809            break;
810        }
811        di = (struct ocfs2_dinode *) (*bh)->b_data;
812        memset(stats, 0, sizeof(struct ocfs2_blockcheck_stats));
813        spin_lock_init(&stats->b_lock);
814        tmpstat = ocfs2_verify_volume(di, *bh, blksize, stats);
815        if (tmpstat < 0) {
816            brelse(*bh);
817            *bh = NULL;
818        }
819        if (tmpstat != -EAGAIN) {
820            status = tmpstat;
821            break;
822        }
823    }
824
825bail:
826    return status;
827}
828
829static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
830{
831    u32 hb_enabled = OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL;
832
833    if (osb->s_mount_opt & hb_enabled) {
834        if (ocfs2_mount_local(osb)) {
835            mlog(ML_ERROR, "Cannot heartbeat on a locally "
836                 "mounted device.\n");
837            return -EINVAL;
838        }
839        if (ocfs2_userspace_stack(osb)) {
840            mlog(ML_ERROR, "Userspace stack expected, but "
841                 "o2cb heartbeat arguments passed to mount\n");
842            return -EINVAL;
843        }
844        if (((osb->s_mount_opt & OCFS2_MOUNT_HB_GLOBAL) &&
845             !ocfs2_cluster_o2cb_global_heartbeat(osb)) ||
846            ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) &&
847             ocfs2_cluster_o2cb_global_heartbeat(osb))) {
848            mlog(ML_ERROR, "Mismatching o2cb heartbeat modes\n");
849            return -EINVAL;
850        }
851    }
852
853    if (!(osb->s_mount_opt & hb_enabled)) {
854        if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
855            !ocfs2_userspace_stack(osb)) {
856            mlog(ML_ERROR, "Heartbeat has to be started to mount "
857                 "a read-write clustered device.\n");
858            return -EINVAL;
859        }
860    }
861
862    return 0;
863}
864
865/*
866 * If we're using a userspace stack, mount should have passed
867 * a name that matches the disk. If not, mount should not
868 * have passed a stack.
869 */
870static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
871                    struct mount_options *mopt)
872{
873    if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
874        mlog(ML_ERROR,
875             "cluster stack passed to mount, but this filesystem "
876             "does not support it\n");
877        return -EINVAL;
878    }
879
880    if (ocfs2_userspace_stack(osb) &&
881        strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
882            OCFS2_STACK_LABEL_LEN)) {
883        mlog(ML_ERROR,
884             "cluster stack passed to mount (\"%s\") does not "
885             "match the filesystem (\"%s\")\n",
886             mopt->cluster_stack,
887             osb->osb_cluster_stack);
888        return -EINVAL;
889    }
890
891    return 0;
892}
893
894static int ocfs2_susp_quotas(struct ocfs2_super *osb, int unsuspend)
895{
896    int type;
897    struct super_block *sb = osb->sb;
898    unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
899                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
900    int status = 0;
901
902    for (type = 0; type < MAXQUOTAS; type++) {
903        if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
904            continue;
905        if (unsuspend)
906            status = dquot_resume(sb, type);
907        else {
908            struct ocfs2_mem_dqinfo *oinfo;
909
910            /* Cancel periodic syncing before suspending */
911            oinfo = sb_dqinfo(sb, type)->dqi_priv;
912            cancel_delayed_work_sync(&oinfo->dqi_sync_work);
913            status = dquot_suspend(sb, type);
914        }
915        if (status < 0)
916            break;
917    }
918    if (status < 0)
919        mlog(ML_ERROR, "Failed to suspend/unsuspend quotas on "
920             "remount (error = %d).\n", status);
921    return status;
922}
923
924static int ocfs2_enable_quotas(struct ocfs2_super *osb)
925{
926    struct inode *inode[MAXQUOTAS] = { NULL, NULL };
927    struct super_block *sb = osb->sb;
928    unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
929                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
930    unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
931                    LOCAL_GROUP_QUOTA_SYSTEM_INODE };
932    int status;
933    int type;
934
935    sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NEGATIVE_USAGE;
936    for (type = 0; type < MAXQUOTAS; type++) {
937        if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
938            continue;
939        inode[type] = ocfs2_get_system_file_inode(osb, ino[type],
940                            osb->slot_num);
941        if (!inode[type]) {
942            status = -ENOENT;
943            goto out_quota_off;
944        }
945        status = dquot_enable(inode[type], type, QFMT_OCFS2,
946                      DQUOT_USAGE_ENABLED);
947        if (status < 0)
948            goto out_quota_off;
949    }
950
951    for (type = 0; type < MAXQUOTAS; type++)
952        iput(inode[type]);
953    return 0;
954out_quota_off:
955    ocfs2_disable_quotas(osb);
956    for (type = 0; type < MAXQUOTAS; type++)
957        iput(inode[type]);
958    mlog_errno(status);
959    return status;
960}
961
962static void ocfs2_disable_quotas(struct ocfs2_super *osb)
963{
964    int type;
965    struct inode *inode;
966    struct super_block *sb = osb->sb;
967    struct ocfs2_mem_dqinfo *oinfo;
968
969    /* We mostly ignore errors in this function because there's not much
970     * we can do when we see them */
971    for (type = 0; type < MAXQUOTAS; type++) {
972        if (!sb_has_quota_loaded(sb, type))
973            continue;
974        /* Cancel periodic syncing before we grab dqonoff_mutex */
975        oinfo = sb_dqinfo(sb, type)->dqi_priv;
976        cancel_delayed_work_sync(&oinfo->dqi_sync_work);
977        inode = igrab(sb->s_dquot.files[type]);
978        /* Turn off quotas. This will remove all dquot structures from
979         * memory and so they will be automatically synced to global
980         * quota files */
981        dquot_disable(sb, type, DQUOT_USAGE_ENABLED |
982                    DQUOT_LIMITS_ENABLED);
983        if (!inode)
984            continue;
985        iput(inode);
986    }
987}
988
989/* Handle quota on quotactl */
990static int ocfs2_quota_on(struct super_block *sb, int type, int format_id)
991{
992    unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
993                         OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
994
995    if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
996        return -EINVAL;
997
998    return dquot_enable(sb_dqopt(sb)->files[type], type,
999                format_id, DQUOT_LIMITS_ENABLED);
1000}
1001
1002/* Handle quota off quotactl */
1003static int ocfs2_quota_off(struct super_block *sb, int type)
1004{
1005    return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
1006}
1007
1008static const struct quotactl_ops ocfs2_quotactl_ops = {
1009    .quota_on_meta = ocfs2_quota_on,
1010    .quota_off = ocfs2_quota_off,
1011    .quota_sync = dquot_quota_sync,
1012    .get_info = dquot_get_dqinfo,
1013    .set_info = dquot_set_dqinfo,
1014    .get_dqblk = dquot_get_dqblk,
1015    .set_dqblk = dquot_set_dqblk,
1016};
1017
1018static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
1019{
1020    struct dentry *root;
1021    int status, sector_size;
1022    struct mount_options parsed_options;
1023    struct inode *inode = NULL;
1024    struct ocfs2_super *osb = NULL;
1025    struct buffer_head *bh = NULL;
1026    char nodestr[8];
1027    struct ocfs2_blockcheck_stats stats;
1028
1029    trace_ocfs2_fill_super(sb, data, silent);
1030
1031    if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
1032        status = -EINVAL;
1033        goto read_super_error;
1034    }
1035
1036    /* probe for superblock */
1037    status = ocfs2_sb_probe(sb, &bh, &sector_size, &stats);
1038    if (status < 0) {
1039        mlog(ML_ERROR, "superblock probe failed!\n");
1040        goto read_super_error;
1041    }
1042
1043    status = ocfs2_initialize_super(sb, bh, sector_size, &stats);
1044    osb = OCFS2_SB(sb);
1045    if (status < 0) {
1046        mlog_errno(status);
1047        goto read_super_error;
1048    }
1049    brelse(bh);
1050    bh = NULL;
1051
1052    if (!ocfs2_check_set_options(sb, &parsed_options)) {
1053        status = -EINVAL;
1054        goto read_super_error;
1055    }
1056    osb->s_mount_opt = parsed_options.mount_opt;
1057    osb->s_atime_quantum = parsed_options.atime_quantum;
1058    osb->preferred_slot = parsed_options.slot;
1059    osb->osb_commit_interval = parsed_options.commit_interval;
1060
1061    ocfs2_la_set_sizes(osb, parsed_options.localalloc_opt);
1062    osb->osb_resv_level = parsed_options.resv_level;
1063    osb->osb_dir_resv_level = parsed_options.resv_level;
1064    if (parsed_options.dir_resv_level == -1)
1065        osb->osb_dir_resv_level = parsed_options.resv_level;
1066    else
1067        osb->osb_dir_resv_level = parsed_options.dir_resv_level;
1068
1069    status = ocfs2_verify_userspace_stack(osb, &parsed_options);
1070    if (status)
1071        goto read_super_error;
1072
1073    sb->s_magic = OCFS2_SUPER_MAGIC;
1074
1075    sb->s_flags = (sb->s_flags & ~(MS_POSIXACL | MS_NOSEC)) |
1076        ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1077
1078    /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
1079     * heartbeat=none */
1080    if (bdev_read_only(sb->s_bdev)) {
1081        if (!(sb->s_flags & MS_RDONLY)) {
1082            status = -EACCES;
1083            mlog(ML_ERROR, "Readonly device detected but readonly "
1084                 "mount was not specified.\n");
1085            goto read_super_error;
1086        }
1087
1088        /* You should not be able to start a local heartbeat
1089         * on a readonly device. */
1090        if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
1091            status = -EROFS;
1092            mlog(ML_ERROR, "Local heartbeat specified on readonly "
1093                 "device.\n");
1094            goto read_super_error;
1095        }
1096
1097        status = ocfs2_check_journals_nolocks(osb);
1098        if (status < 0) {
1099            if (status == -EROFS)
1100                mlog(ML_ERROR, "Recovery required on readonly "
1101                     "file system, but write access is "
1102                     "unavailable.\n");
1103            else
1104                mlog_errno(status);
1105            goto read_super_error;
1106        }
1107
1108        ocfs2_set_ro_flag(osb, 1);
1109
1110        printk(KERN_NOTICE "Readonly device detected. No cluster "
1111               "services will be utilized for this mount. Recovery "
1112               "will be skipped.\n");
1113    }
1114
1115    if (!ocfs2_is_hard_readonly(osb)) {
1116        if (sb->s_flags & MS_RDONLY)
1117            ocfs2_set_ro_flag(osb, 0);
1118    }
1119
1120    status = ocfs2_verify_heartbeat(osb);
1121    if (status < 0) {
1122        mlog_errno(status);
1123        goto read_super_error;
1124    }
1125
1126    osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
1127                         ocfs2_debugfs_root);
1128    if (!osb->osb_debug_root) {
1129        status = -EINVAL;
1130        mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
1131        goto read_super_error;
1132    }
1133
1134    osb->osb_ctxt = debugfs_create_file("fs_state", S_IFREG|S_IRUSR,
1135                        osb->osb_debug_root,
1136                        osb,
1137                        &ocfs2_osb_debug_fops);
1138    if (!osb->osb_ctxt) {
1139        status = -EINVAL;
1140        mlog_errno(status);
1141        goto read_super_error;
1142    }
1143
1144    if (ocfs2_meta_ecc(osb)) {
1145        status = ocfs2_blockcheck_stats_debugfs_install(
1146                        &osb->osb_ecc_stats,
1147                        osb->osb_debug_root);
1148        if (status) {
1149            mlog(ML_ERROR,
1150                 "Unable to create blockcheck statistics "
1151                 "files\n");
1152            goto read_super_error;
1153        }
1154    }
1155
1156    status = ocfs2_mount_volume(sb);
1157    if (osb->root_inode)
1158        inode = igrab(osb->root_inode);
1159
1160    if (status < 0)
1161        goto read_super_error;
1162
1163    if (!inode) {
1164        status = -EIO;
1165        mlog_errno(status);
1166        goto read_super_error;
1167    }
1168
1169    root = d_alloc_root(inode);
1170    if (!root) {
1171        status = -ENOMEM;
1172        mlog_errno(status);
1173        goto read_super_error;
1174    }
1175
1176    sb->s_root = root;
1177
1178    ocfs2_complete_mount_recovery(osb);
1179
1180    if (ocfs2_mount_local(osb))
1181        snprintf(nodestr, sizeof(nodestr), "local");
1182    else
1183        snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1184
1185    printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
1186           "with %s data mode.\n",
1187           osb->dev_str, nodestr, osb->slot_num,
1188           osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
1189           "ordered");
1190
1191    atomic_set(&osb->vol_state, VOLUME_MOUNTED);
1192    wake_up(&osb->osb_mount_event);
1193
1194    /* Now we can initialize quotas because we can afford to wait
1195     * for cluster locks recovery now. That also means that truncation
1196     * log recovery can happen but that waits for proper quota setup */
1197    if (!(sb->s_flags & MS_RDONLY)) {
1198        status = ocfs2_enable_quotas(osb);
1199        if (status < 0) {
1200            /* We have to err-out specially here because
1201             * s_root is already set */
1202            mlog_errno(status);
1203            atomic_set(&osb->vol_state, VOLUME_DISABLED);
1204            wake_up(&osb->osb_mount_event);
1205            return status;
1206        }
1207    }
1208
1209    ocfs2_complete_quota_recovery(osb);
1210
1211    /* Now we wake up again for processes waiting for quotas */
1212    atomic_set(&osb->vol_state, VOLUME_MOUNTED_QUOTAS);
1213    wake_up(&osb->osb_mount_event);
1214
1215    /* Start this when the mount is almost sure of being successful */
1216    ocfs2_orphan_scan_start(osb);
1217
1218    return status;
1219
1220read_super_error:
1221    brelse(bh);
1222
1223    if (inode)
1224        iput(inode);
1225
1226    if (osb) {
1227        atomic_set(&osb->vol_state, VOLUME_DISABLED);
1228        wake_up(&osb->osb_mount_event);
1229        ocfs2_dismount_volume(sb, 1);
1230    }
1231
1232    if (status)
1233        mlog_errno(status);
1234    return status;
1235}
1236
1237static struct dentry *ocfs2_mount(struct file_system_type *fs_type,
1238            int flags,
1239            const char *dev_name,
1240            void *data)
1241{
1242    return mount_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
1243}
1244
1245static void ocfs2_kill_sb(struct super_block *sb)
1246{
1247    struct ocfs2_super *osb = OCFS2_SB(sb);
1248
1249    /* Failed mount? */
1250    if (!osb || atomic_read(&osb->vol_state) == VOLUME_DISABLED)
1251        goto out;
1252
1253    /* Prevent further queueing of inode drop events */
1254    spin_lock(&dentry_list_lock);
1255    ocfs2_set_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED);
1256    spin_unlock(&dentry_list_lock);
1257    /* Wait for work to finish and/or remove it */
1258    cancel_work_sync(&osb->dentry_lock_work);
1259out:
1260    kill_block_super(sb);
1261}
1262
1263static struct file_system_type ocfs2_fs_type = {
1264    .owner = THIS_MODULE,
1265    .name = "ocfs2",
1266    .mount = ocfs2_mount,
1267    .kill_sb = ocfs2_kill_sb,
1268
1269    .fs_flags = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
1270    .next = NULL
1271};
1272
1273static int ocfs2_check_set_options(struct super_block *sb,
1274                   struct mount_options *options)
1275{
1276    if (options->mount_opt & OCFS2_MOUNT_USRQUOTA &&
1277        !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1278                     OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
1279        mlog(ML_ERROR, "User quotas were requested, but this "
1280             "filesystem does not have the feature enabled.\n");
1281        return 0;
1282    }
1283    if (options->mount_opt & OCFS2_MOUNT_GRPQUOTA &&
1284        !OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1285                     OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
1286        mlog(ML_ERROR, "Group quotas were requested, but this "
1287             "filesystem does not have the feature enabled.\n");
1288        return 0;
1289    }
1290    if (options->mount_opt & OCFS2_MOUNT_POSIX_ACL &&
1291        !OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR)) {
1292        mlog(ML_ERROR, "ACL support requested but extended attributes "
1293             "feature is not enabled\n");
1294        return 0;
1295    }
1296    /* No ACL setting specified? Use XATTR feature... */
1297    if (!(options->mount_opt & (OCFS2_MOUNT_POSIX_ACL |
1298                    OCFS2_MOUNT_NO_POSIX_ACL))) {
1299        if (OCFS2_HAS_INCOMPAT_FEATURE(sb, OCFS2_FEATURE_INCOMPAT_XATTR))
1300            options->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1301        else
1302            options->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1303    }
1304    return 1;
1305}
1306
1307static int ocfs2_parse_options(struct super_block *sb,
1308                   char *options,
1309                   struct mount_options *mopt,
1310                   int is_remount)
1311{
1312    int status, user_stack = 0;
1313    char *p;
1314    u32 tmp;
1315
1316    trace_ocfs2_parse_options(is_remount, options ? options : "(none)");
1317
1318    mopt->commit_interval = 0;
1319    mopt->mount_opt = OCFS2_MOUNT_NOINTR;
1320    mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1321    mopt->slot = OCFS2_INVALID_SLOT;
1322    mopt->localalloc_opt = -1;
1323    mopt->cluster_stack[0] = '\0';
1324    mopt->resv_level = OCFS2_DEFAULT_RESV_LEVEL;
1325    mopt->dir_resv_level = -1;
1326
1327    if (!options) {
1328        status = 1;
1329        goto bail;
1330    }
1331
1332    while ((p = strsep(&options, ",")) != NULL) {
1333        int token, option;
1334        substring_t args[MAX_OPT_ARGS];
1335
1336        if (!*p)
1337            continue;
1338
1339        token = match_token(p, tokens, args);
1340        switch (token) {
1341        case Opt_hb_local:
1342            mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
1343            break;
1344        case Opt_hb_none:
1345            mopt->mount_opt |= OCFS2_MOUNT_HB_NONE;
1346            break;
1347        case Opt_hb_global:
1348            mopt->mount_opt |= OCFS2_MOUNT_HB_GLOBAL;
1349            break;
1350        case Opt_barrier:
1351            if (match_int(&args[0], &option)) {
1352                status = 0;
1353                goto bail;
1354            }
1355            if (option)
1356                mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
1357            else
1358                mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
1359            break;
1360        case Opt_intr:
1361            mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
1362            break;
1363        case Opt_nointr:
1364            mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
1365            break;
1366        case Opt_err_panic:
1367            mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
1368            break;
1369        case Opt_err_ro:
1370            mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
1371            break;
1372        case Opt_data_ordered:
1373            mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
1374            break;
1375        case Opt_data_writeback:
1376            mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
1377            break;
1378        case Opt_user_xattr:
1379            mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
1380            break;
1381        case Opt_nouser_xattr:
1382            mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
1383            break;
1384        case Opt_atime_quantum:
1385            if (match_int(&args[0], &option)) {
1386                status = 0;
1387                goto bail;
1388            }
1389            if (option >= 0)
1390                mopt->atime_quantum = option;
1391            break;
1392        case Opt_slot:
1393            option = 0;
1394            if (match_int(&args[0], &option)) {
1395                status = 0;
1396                goto bail;
1397            }
1398            if (option)
1399                mopt->slot = (s16)option;
1400            break;
1401        case Opt_commit:
1402            option = 0;
1403            if (match_int(&args[0], &option)) {
1404                status = 0;
1405                goto bail;
1406            }
1407            if (option < 0)
1408                return 0;
1409            if (option == 0)
1410                option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1411            mopt->commit_interval = HZ * option;
1412            break;
1413        case Opt_localalloc:
1414            option = 0;
1415            if (match_int(&args[0], &option)) {
1416                status = 0;
1417                goto bail;
1418            }
1419            if (option >= 0)
1420                mopt->localalloc_opt = option;
1421            break;
1422        case Opt_localflocks:
1423            /*
1424             * Changing this during remount could race
1425             * flock() requests, or "unbalance" existing
1426             * ones (e.g., a lock is taken in one mode but
1427             * dropped in the other). If users care enough
1428             * to flip locking modes during remount, we
1429             * could add a "local" flag to individual
1430             * flock structures for proper tracking of
1431             * state.
1432             */
1433            if (!is_remount)
1434                mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
1435            break;
1436        case Opt_stack:
1437            /* Check both that the option we were passed
1438             * is of the right length and that it is a proper
1439             * string of the right length.
1440             */
1441            if (((args[0].to - args[0].from) !=
1442                 OCFS2_STACK_LABEL_LEN) ||
1443                (strnlen(args[0].from,
1444                     OCFS2_STACK_LABEL_LEN) !=
1445                 OCFS2_STACK_LABEL_LEN)) {
1446                mlog(ML_ERROR,
1447                     "Invalid cluster_stack option\n");
1448                status = 0;
1449                goto bail;
1450            }
1451            memcpy(mopt->cluster_stack, args[0].from,
1452                   OCFS2_STACK_LABEL_LEN);
1453            mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1454            /*
1455             * Open code the memcmp here as we don't have
1456             * an osb to pass to
1457             * ocfs2_userspace_stack().
1458             */
1459            if (memcmp(mopt->cluster_stack,
1460                   OCFS2_CLASSIC_CLUSTER_STACK,
1461                   OCFS2_STACK_LABEL_LEN))
1462                user_stack = 1;
1463            break;
1464        case Opt_inode64:
1465            mopt->mount_opt |= OCFS2_MOUNT_INODE64;
1466            break;
1467        case Opt_usrquota:
1468            mopt->mount_opt |= OCFS2_MOUNT_USRQUOTA;
1469            break;
1470        case Opt_grpquota:
1471            mopt->mount_opt |= OCFS2_MOUNT_GRPQUOTA;
1472            break;
1473        case Opt_coherency_buffered:
1474            mopt->mount_opt |= OCFS2_MOUNT_COHERENCY_BUFFERED;
1475            break;
1476        case Opt_coherency_full:
1477            mopt->mount_opt &= ~OCFS2_MOUNT_COHERENCY_BUFFERED;
1478            break;
1479        case Opt_acl:
1480            mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
1481            mopt->mount_opt &= ~OCFS2_MOUNT_NO_POSIX_ACL;
1482            break;
1483        case Opt_noacl:
1484            mopt->mount_opt |= OCFS2_MOUNT_NO_POSIX_ACL;
1485            mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
1486            break;
1487        case Opt_resv_level:
1488            if (is_remount)
1489                break;
1490            if (match_int(&args[0], &option)) {
1491                status = 0;
1492                goto bail;
1493            }
1494            if (option >= OCFS2_MIN_RESV_LEVEL &&
1495                option < OCFS2_MAX_RESV_LEVEL)
1496                mopt->resv_level = option;
1497            break;
1498        case Opt_dir_resv_level:
1499            if (is_remount)
1500                break;
1501            if (match_int(&args[0], &option)) {
1502                status = 0;
1503                goto bail;
1504            }
1505            if (option >= OCFS2_MIN_RESV_LEVEL &&
1506                option < OCFS2_MAX_RESV_LEVEL)
1507                mopt->dir_resv_level = option;
1508            break;
1509        default:
1510            mlog(ML_ERROR,
1511                 "Unrecognized mount option \"%s\" "
1512                 "or missing value\n", p);
1513            status = 0;
1514            goto bail;
1515        }
1516    }
1517
1518    if (user_stack == 0) {
1519        /* Ensure only one heartbeat mode */
1520        tmp = mopt->mount_opt & (OCFS2_MOUNT_HB_LOCAL |
1521                     OCFS2_MOUNT_HB_GLOBAL |
1522                     OCFS2_MOUNT_HB_NONE);
1523        if (hweight32(tmp) != 1) {
1524            mlog(ML_ERROR, "Invalid heartbeat mount options\n");
1525            status = 0;
1526            goto bail;
1527        }
1528    }
1529
1530    status = 1;
1531
1532bail:
1533    return status;
1534}
1535
1536static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1537{
1538    struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1539    unsigned long opts = osb->s_mount_opt;
1540    unsigned int local_alloc_megs;
1541
1542    if (opts & (OCFS2_MOUNT_HB_LOCAL | OCFS2_MOUNT_HB_GLOBAL)) {
1543        seq_printf(s, ",_netdev");
1544        if (opts & OCFS2_MOUNT_HB_LOCAL)
1545            seq_printf(s, ",%s", OCFS2_HB_LOCAL);
1546        else
1547            seq_printf(s, ",%s", OCFS2_HB_GLOBAL);
1548    } else
1549        seq_printf(s, ",%s", OCFS2_HB_NONE);
1550
1551    if (opts & OCFS2_MOUNT_NOINTR)
1552        seq_printf(s, ",nointr");
1553
1554    if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1555        seq_printf(s, ",data=writeback");
1556    else
1557        seq_printf(s, ",data=ordered");
1558
1559    if (opts & OCFS2_MOUNT_BARRIER)
1560        seq_printf(s, ",barrier=1");
1561
1562    if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1563        seq_printf(s, ",errors=panic");
1564    else
1565        seq_printf(s, ",errors=remount-ro");
1566
1567    if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1568        seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1569
1570    if (!(mnt->mnt_flags & MNT_NOATIME) && !(mnt->mnt_flags & MNT_RELATIME))
1571        seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1572
1573    if (osb->osb_commit_interval)
1574        seq_printf(s, ",commit=%u",
1575               (unsigned) (osb->osb_commit_interval / HZ));
1576
1577    local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1578    if (local_alloc_megs != ocfs2_la_default_mb(osb))
1579        seq_printf(s, ",localalloc=%d", local_alloc_megs);
1580
1581    if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1582        seq_printf(s, ",localflocks,");
1583
1584    if (osb->osb_cluster_stack[0])
1585        seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1586               osb->osb_cluster_stack);
1587    if (opts & OCFS2_MOUNT_USRQUOTA)
1588        seq_printf(s, ",usrquota");
1589    if (opts & OCFS2_MOUNT_GRPQUOTA)
1590        seq_printf(s, ",grpquota");
1591
1592    if (opts & OCFS2_MOUNT_COHERENCY_BUFFERED)
1593        seq_printf(s, ",coherency=buffered");
1594    else
1595        seq_printf(s, ",coherency=full");
1596
1597    if (opts & OCFS2_MOUNT_NOUSERXATTR)
1598        seq_printf(s, ",nouser_xattr");
1599    else
1600        seq_printf(s, ",user_xattr");
1601
1602    if (opts & OCFS2_MOUNT_INODE64)
1603        seq_printf(s, ",inode64");
1604
1605    if (opts & OCFS2_MOUNT_POSIX_ACL)
1606        seq_printf(s, ",acl");
1607    else
1608        seq_printf(s, ",noacl");
1609
1610    if (osb->osb_resv_level != OCFS2_DEFAULT_RESV_LEVEL)
1611        seq_printf(s, ",resv_level=%d", osb->osb_resv_level);
1612
1613    if (osb->osb_dir_resv_level != osb->osb_resv_level)
1614        seq_printf(s, ",dir_resv_level=%d", osb->osb_resv_level);
1615
1616    return 0;
1617}
1618
1619static int __init ocfs2_init(void)
1620{
1621    int status;
1622
1623    ocfs2_print_version();
1624
1625    status = init_ocfs2_uptodate_cache();
1626    if (status < 0) {
1627        mlog_errno(status);
1628        goto leave;
1629    }
1630
1631    status = ocfs2_initialize_mem_caches();
1632    if (status < 0) {
1633        mlog_errno(status);
1634        goto leave;
1635    }
1636
1637    ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1638    if (!ocfs2_wq) {
1639        status = -ENOMEM;
1640        goto leave;
1641    }
1642
1643    ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1644    if (!ocfs2_debugfs_root) {
1645        status = -EFAULT;
1646        mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1647    }
1648
1649    ocfs2_set_locking_protocol();
1650
1651    status = register_quota_format(&ocfs2_quota_format);
1652leave:
1653    if (status < 0) {
1654        ocfs2_free_mem_caches();
1655        exit_ocfs2_uptodate_cache();
1656        mlog_errno(status);
1657    }
1658
1659    if (status >= 0) {
1660        return register_filesystem(&ocfs2_fs_type);
1661    } else
1662        return -1;
1663}
1664
1665static void __exit ocfs2_exit(void)
1666{
1667    if (ocfs2_wq) {
1668        flush_workqueue(ocfs2_wq);
1669        destroy_workqueue(ocfs2_wq);
1670    }
1671
1672    unregister_quota_format(&ocfs2_quota_format);
1673
1674    debugfs_remove(ocfs2_debugfs_root);
1675
1676    ocfs2_free_mem_caches();
1677
1678    unregister_filesystem(&ocfs2_fs_type);
1679
1680    exit_ocfs2_uptodate_cache();
1681}
1682
1683static void ocfs2_put_super(struct super_block *sb)
1684{
1685    trace_ocfs2_put_super(sb);
1686
1687    ocfs2_sync_blockdev(sb);
1688    ocfs2_dismount_volume(sb, 0);
1689}
1690
1691static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1692{
1693    struct ocfs2_super *osb;
1694    u32 numbits, freebits;
1695    int status;
1696    struct ocfs2_dinode *bm_lock;
1697    struct buffer_head *bh = NULL;
1698    struct inode *inode = NULL;
1699
1700    trace_ocfs2_statfs(dentry->d_sb, buf);
1701
1702    osb = OCFS2_SB(dentry->d_sb);
1703
1704    inode = ocfs2_get_system_file_inode(osb,
1705                        GLOBAL_BITMAP_SYSTEM_INODE,
1706                        OCFS2_INVALID_SLOT);
1707    if (!inode) {
1708        mlog(ML_ERROR, "failed to get bitmap inode\n");
1709        status = -EIO;
1710        goto bail;
1711    }
1712
1713    status = ocfs2_inode_lock(inode, &bh, 0);
1714    if (status < 0) {
1715        mlog_errno(status);
1716        goto bail;
1717    }
1718
1719    bm_lock = (struct ocfs2_dinode *) bh->b_data;
1720
1721    numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1722    freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1723
1724    buf->f_type = OCFS2_SUPER_MAGIC;
1725    buf->f_bsize = dentry->d_sb->s_blocksize;
1726    buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1727    buf->f_blocks = ((sector_t) numbits) *
1728            (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1729    buf->f_bfree = ((sector_t) freebits) *
1730               (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1731    buf->f_bavail = buf->f_bfree;
1732    buf->f_files = numbits;
1733    buf->f_ffree = freebits;
1734    buf->f_fsid.val[0] = crc32_le(0, osb->uuid_str, OCFS2_VOL_UUID_LEN)
1735                & 0xFFFFFFFFUL;
1736    buf->f_fsid.val[1] = crc32_le(0, osb->uuid_str + OCFS2_VOL_UUID_LEN,
1737                OCFS2_VOL_UUID_LEN) & 0xFFFFFFFFUL;
1738
1739    brelse(bh);
1740
1741    ocfs2_inode_unlock(inode, 0);
1742    status = 0;
1743bail:
1744    if (inode)
1745        iput(inode);
1746
1747    if (status)
1748        mlog_errno(status);
1749
1750    return status;
1751}
1752
1753static void ocfs2_inode_init_once(void *data)
1754{
1755    struct ocfs2_inode_info *oi = data;
1756
1757    oi->ip_flags = 0;
1758    oi->ip_open_count = 0;
1759    spin_lock_init(&oi->ip_lock);
1760    ocfs2_extent_map_init(&oi->vfs_inode);
1761    INIT_LIST_HEAD(&oi->ip_io_markers);
1762    oi->ip_dir_start_lookup = 0;
1763
1764    init_rwsem(&oi->ip_alloc_sem);
1765    init_rwsem(&oi->ip_xattr_sem);
1766    mutex_init(&oi->ip_io_mutex);
1767
1768    oi->ip_blkno = 0ULL;
1769    oi->ip_clusters = 0;
1770
1771    ocfs2_resv_init_once(&oi->ip_la_data_resv);
1772
1773    ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1774    ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1775    ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1776
1777    ocfs2_metadata_cache_init(INODE_CACHE(&oi->vfs_inode),
1778                  &ocfs2_inode_caching_ops);
1779
1780    inode_init_once(&oi->vfs_inode);
1781}
1782
1783static int ocfs2_initialize_mem_caches(void)
1784{
1785    ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1786                       sizeof(struct ocfs2_inode_info),
1787                       0,
1788                       (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1789                        SLAB_MEM_SPREAD),
1790                       ocfs2_inode_init_once);
1791    ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1792                    sizeof(struct ocfs2_dquot),
1793                    0,
1794                    (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1795                        SLAB_MEM_SPREAD),
1796                    NULL);
1797    ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1798                    sizeof(struct ocfs2_quota_chunk),
1799                    0,
1800                    (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1801                    NULL);
1802    if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1803        !ocfs2_qf_chunk_cachep) {
1804        if (ocfs2_inode_cachep)
1805            kmem_cache_destroy(ocfs2_inode_cachep);
1806        if (ocfs2_dquot_cachep)
1807            kmem_cache_destroy(ocfs2_dquot_cachep);
1808        if (ocfs2_qf_chunk_cachep)
1809            kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1810        return -ENOMEM;
1811    }
1812
1813    return 0;
1814}
1815
1816static void ocfs2_free_mem_caches(void)
1817{
1818    if (ocfs2_inode_cachep)
1819        kmem_cache_destroy(ocfs2_inode_cachep);
1820    ocfs2_inode_cachep = NULL;
1821
1822    if (ocfs2_dquot_cachep)
1823        kmem_cache_destroy(ocfs2_dquot_cachep);
1824    ocfs2_dquot_cachep = NULL;
1825
1826    if (ocfs2_qf_chunk_cachep)
1827        kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1828    ocfs2_qf_chunk_cachep = NULL;
1829}
1830
1831static int ocfs2_get_sector(struct super_block *sb,
1832                struct buffer_head **bh,
1833                int block,
1834                int sect_size)
1835{
1836    if (!sb_set_blocksize(sb, sect_size)) {
1837        mlog(ML_ERROR, "unable to set blocksize\n");
1838        return -EIO;
1839    }
1840
1841    *bh = sb_getblk(sb, block);
1842    if (!*bh) {
1843        mlog_errno(-EIO);
1844        return -EIO;
1845    }
1846    lock_buffer(*bh);
1847    if (!buffer_dirty(*bh))
1848        clear_buffer_uptodate(*bh);
1849    unlock_buffer(*bh);
1850    ll_rw_block(READ, 1, bh);
1851    wait_on_buffer(*bh);
1852    if (!buffer_uptodate(*bh)) {
1853        mlog_errno(-EIO);
1854        brelse(*bh);
1855        *bh = NULL;
1856        return -EIO;
1857    }
1858
1859    return 0;
1860}
1861
1862static int ocfs2_mount_volume(struct super_block *sb)
1863{
1864    int status = 0;
1865    int unlock_super = 0;
1866    struct ocfs2_super *osb = OCFS2_SB(sb);
1867
1868    if (ocfs2_is_hard_readonly(osb))
1869        goto leave;
1870
1871    status = ocfs2_dlm_init(osb);
1872    if (status < 0) {
1873        mlog_errno(status);
1874        goto leave;
1875    }
1876
1877    status = ocfs2_super_lock(osb, 1);
1878    if (status < 0) {
1879        mlog_errno(status);
1880        goto leave;
1881    }
1882    unlock_super = 1;
1883
1884    /* This will load up the node map and add ourselves to it. */
1885    status = ocfs2_find_slot(osb);
1886    if (status < 0) {
1887        mlog_errno(status);
1888        goto leave;
1889    }
1890
1891    /* load all node-local system inodes */
1892    status = ocfs2_init_local_system_inodes(osb);
1893    if (status < 0) {
1894        mlog_errno(status);
1895        goto leave;
1896    }
1897
1898    status = ocfs2_check_volume(osb);
1899    if (status < 0) {
1900        mlog_errno(status);
1901        goto leave;
1902    }
1903
1904    status = ocfs2_truncate_log_init(osb);
1905    if (status < 0)
1906        mlog_errno(status);
1907
1908leave:
1909    if (unlock_super)
1910        ocfs2_super_unlock(osb, 1);
1911
1912    return status;
1913}
1914
1915static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1916{
1917    int tmp, hangup_needed = 0;
1918    struct ocfs2_super *osb = NULL;
1919    char nodestr[8];
1920
1921    trace_ocfs2_dismount_volume(sb);
1922
1923    BUG_ON(!sb);
1924    osb = OCFS2_SB(sb);
1925    BUG_ON(!osb);
1926
1927    debugfs_remove(osb->osb_ctxt);
1928
1929    /*
1930     * Flush inode dropping work queue so that deletes are
1931     * performed while the filesystem is still working
1932     */
1933    ocfs2_drop_all_dl_inodes(osb);
1934
1935    /* Orphan scan should be stopped as early as possible */
1936    ocfs2_orphan_scan_stop(osb);
1937
1938    ocfs2_disable_quotas(osb);
1939
1940    ocfs2_shutdown_local_alloc(osb);
1941
1942    ocfs2_truncate_log_shutdown(osb);
1943
1944    /* This will disable recovery and flush any recovery work. */
1945    ocfs2_recovery_exit(osb);
1946
1947    ocfs2_journal_shutdown(osb);
1948
1949    ocfs2_sync_blockdev(sb);
1950
1951    ocfs2_purge_refcount_trees(osb);
1952
1953    /* No cluster connection means we've failed during mount, so skip
1954     * all the steps which depended on that to complete. */
1955    if (osb->cconn) {
1956        tmp = ocfs2_super_lock(osb, 1);
1957        if (tmp < 0) {
1958            mlog_errno(tmp);
1959            return;
1960        }
1961    }
1962
1963    if (osb->slot_num != OCFS2_INVALID_SLOT)
1964        ocfs2_put_slot(osb);
1965
1966    if (osb->cconn)
1967        ocfs2_super_unlock(osb, 1);
1968
1969    ocfs2_release_system_inodes(osb);
1970
1971    /*
1972     * If we're dismounting due to mount error, mount.ocfs2 will clean
1973     * up heartbeat. If we're a local mount, there is no heartbeat.
1974     * If we failed before we got a uuid_str yet, we can't stop
1975     * heartbeat. Otherwise, do it.
1976     */
1977    if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1978        hangup_needed = 1;
1979
1980    if (osb->cconn)
1981        ocfs2_dlm_shutdown(osb, hangup_needed);
1982
1983    ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
1984    debugfs_remove(osb->osb_debug_root);
1985
1986    if (hangup_needed)
1987        ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1988
1989    atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1990
1991    if (ocfs2_mount_local(osb))
1992        snprintf(nodestr, sizeof(nodestr), "local");
1993    else
1994        snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1995
1996    printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1997           osb->dev_str, nodestr);
1998
1999    ocfs2_delete_osb(osb);
2000    kfree(osb);
2001    sb->s_dev = 0;
2002    sb->s_fs_info = NULL;
2003}
2004
2005static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
2006                unsigned uuid_bytes)
2007{
2008    int i, ret;
2009    char *ptr;
2010
2011    BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
2012
2013    osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
2014    if (osb->uuid_str == NULL)
2015        return -ENOMEM;
2016
2017    for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
2018        /* print with null */
2019        ret = snprintf(ptr, 3, "%02X", uuid[i]);
2020        if (ret != 2) /* drop super cleans up */
2021            return -EINVAL;
2022        /* then only advance past the last char */
2023        ptr += 2;
2024    }
2025
2026    return 0;
2027}
2028
2029/* Make sure entire volume is addressable by our journal. Requires
2030   osb_clusters_at_boot to be valid and for the journal to have been
2031   initialized by ocfs2_journal_init(). */
2032static int ocfs2_journal_addressable(struct ocfs2_super *osb)
2033{
2034    int status = 0;
2035    u64 max_block =
2036        ocfs2_clusters_to_blocks(osb->sb,
2037                     osb->osb_clusters_at_boot) - 1;
2038
2039    /* 32-bit block number is always OK. */
2040    if (max_block <= (u32)~0ULL)
2041        goto out;
2042
2043    /* Volume is "huge", so see if our journal is new enough to
2044       support it. */
2045    if (!(OCFS2_HAS_COMPAT_FEATURE(osb->sb,
2046                       OCFS2_FEATURE_COMPAT_JBD2_SB) &&
2047          jbd2_journal_check_used_features(osb->journal->j_journal, 0, 0,
2048                           JBD2_FEATURE_INCOMPAT_64BIT))) {
2049        mlog(ML_ERROR, "The journal cannot address the entire volume. "
2050             "Enable the 'block64' journal option with tunefs.ocfs2");
2051        status = -EFBIG;
2052        goto out;
2053    }
2054
2055 out:
2056    return status;
2057}
2058
2059static int ocfs2_initialize_super(struct super_block *sb,
2060                  struct buffer_head *bh,
2061                  int sector_size,
2062                  struct ocfs2_blockcheck_stats *stats)
2063{
2064    int status;
2065    int i, cbits, bbits;
2066    struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2067    struct inode *inode = NULL;
2068    struct ocfs2_journal *journal;
2069    __le32 uuid_net_key;
2070    struct ocfs2_super *osb;
2071    u64 total_blocks;
2072
2073    osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
2074    if (!osb) {
2075        status = -ENOMEM;
2076        mlog_errno(status);
2077        goto bail;
2078    }
2079
2080    sb->s_fs_info = osb;
2081    sb->s_op = &ocfs2_sops;
2082    sb->s_d_op = &ocfs2_dentry_ops;
2083    sb->s_export_op = &ocfs2_export_ops;
2084    sb->s_qcop = &ocfs2_quotactl_ops;
2085    sb->dq_op = &ocfs2_quota_operations;
2086    sb->s_xattr = ocfs2_xattr_handlers;
2087    sb->s_time_gran = 1;
2088    sb->s_flags |= MS_NOATIME;
2089    /* this is needed to support O_LARGEFILE */
2090    cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2091    bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
2092    sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
2093
2094    osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
2095
2096    for (i = 0; i < 3; i++)
2097        osb->osb_dx_seed[i] = le32_to_cpu(di->id2.i_super.s_dx_seed[i]);
2098    osb->osb_dx_seed[3] = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2099
2100    osb->sb = sb;
2101    /* Save off for ocfs2_rw_direct */
2102    osb->s_sectsize_bits = blksize_bits(sector_size);
2103    BUG_ON(!osb->s_sectsize_bits);
2104
2105    spin_lock_init(&osb->dc_task_lock);
2106    init_waitqueue_head(&osb->dc_event);
2107    osb->dc_work_sequence = 0;
2108    osb->dc_wake_sequence = 0;
2109    INIT_LIST_HEAD(&osb->blocked_lock_list);
2110    osb->blocked_lock_count = 0;
2111    spin_lock_init(&osb->osb_lock);
2112    spin_lock_init(&osb->osb_xattr_lock);
2113    ocfs2_init_steal_slots(osb);
2114
2115    atomic_set(&osb->alloc_stats.moves, 0);
2116    atomic_set(&osb->alloc_stats.local_data, 0);
2117    atomic_set(&osb->alloc_stats.bitmap_data, 0);
2118    atomic_set(&osb->alloc_stats.bg_allocs, 0);
2119    atomic_set(&osb->alloc_stats.bg_extends, 0);
2120
2121    /* Copy the blockcheck stats from the superblock probe */
2122    osb->osb_ecc_stats = *stats;
2123
2124    ocfs2_init_node_maps(osb);
2125
2126    snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
2127         MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
2128
2129    osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
2130    if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
2131        mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
2132             osb->max_slots);
2133        status = -EINVAL;
2134        goto bail;
2135    }
2136
2137    ocfs2_orphan_scan_init(osb);
2138
2139    status = ocfs2_recovery_init(osb);
2140    if (status) {
2141        mlog(ML_ERROR, "Unable to initialize recovery state\n");
2142        mlog_errno(status);
2143        goto bail;
2144    }
2145
2146    init_waitqueue_head(&osb->checkpoint_event);
2147    atomic_set(&osb->needs_checkpoint, 0);
2148
2149    osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
2150
2151    osb->slot_num = OCFS2_INVALID_SLOT;
2152
2153    osb->s_xattr_inline_size = le16_to_cpu(
2154                    di->id2.i_super.s_xattr_inline_size);
2155
2156    osb->local_alloc_state = OCFS2_LA_UNUSED;
2157    osb->local_alloc_bh = NULL;
2158    INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
2159
2160    init_waitqueue_head(&osb->osb_mount_event);
2161
2162    status = ocfs2_resmap_init(osb, &osb->osb_la_resmap);
2163    if (status) {
2164        mlog_errno(status);
2165        goto bail;
2166    }
2167
2168    osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
2169    if (!osb->vol_label) {
2170        mlog(ML_ERROR, "unable to alloc vol label\n");
2171        status = -ENOMEM;
2172        goto bail;
2173    }
2174
2175    osb->slot_recovery_generations =
2176        kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
2177            GFP_KERNEL);
2178    if (!osb->slot_recovery_generations) {
2179        status = -ENOMEM;
2180        mlog_errno(status);
2181        goto bail;
2182    }
2183
2184    init_waitqueue_head(&osb->osb_wipe_event);
2185    osb->osb_orphan_wipes = kcalloc(osb->max_slots,
2186                    sizeof(*osb->osb_orphan_wipes),
2187                    GFP_KERNEL);
2188    if (!osb->osb_orphan_wipes) {
2189        status = -ENOMEM;
2190        mlog_errno(status);
2191        goto bail;
2192    }
2193
2194    osb->osb_rf_lock_tree = RB_ROOT;
2195
2196    osb->s_feature_compat =
2197        le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
2198    osb->s_feature_ro_compat =
2199        le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
2200    osb->s_feature_incompat =
2201        le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
2202
2203    if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
2204        mlog(ML_ERROR, "couldn't mount because of unsupported "
2205             "optional features (%x).\n", i);
2206        status = -EINVAL;
2207        goto bail;
2208    }
2209    if (!(osb->sb->s_flags & MS_RDONLY) &&
2210        (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
2211        mlog(ML_ERROR, "couldn't mount RDWR because of "
2212             "unsupported optional features (%x).\n", i);
2213        status = -EINVAL;
2214        goto bail;
2215    }
2216
2217    if (ocfs2_clusterinfo_valid(osb)) {
2218        osb->osb_stackflags =
2219            OCFS2_RAW_SB(di)->s_cluster_info.ci_stackflags;
2220        memcpy(osb->osb_cluster_stack,
2221               OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
2222               OCFS2_STACK_LABEL_LEN);
2223        osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
2224        if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
2225            mlog(ML_ERROR,
2226                 "couldn't mount because of an invalid "
2227                 "cluster stack label (%s) \n",
2228                 osb->osb_cluster_stack);
2229            status = -EINVAL;
2230            goto bail;
2231        }
2232    } else {
2233        /* The empty string is identical with classic tools that
2234         * don't know about s_cluster_info. */
2235        osb->osb_cluster_stack[0] = '\0';
2236    }
2237
2238    get_random_bytes(&osb->s_next_generation, sizeof(u32));
2239
2240    /* FIXME
2241     * This should be done in ocfs2_journal_init(), but unknown
2242     * ordering issues will cause the filesystem to crash.
2243     * If anyone wants to figure out what part of the code
2244     * refers to osb->journal before ocfs2_journal_init() is run,
2245     * be my guest.
2246     */
2247    /* initialize our journal structure */
2248
2249    journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
2250    if (!journal) {
2251        mlog(ML_ERROR, "unable to alloc journal\n");
2252        status = -ENOMEM;
2253        goto bail;
2254    }
2255    osb->journal = journal;
2256    journal->j_osb = osb;
2257
2258    atomic_set(&journal->j_num_trans, 0);
2259    init_rwsem(&journal->j_trans_barrier);
2260    init_waitqueue_head(&journal->j_checkpointed);
2261    spin_lock_init(&journal->j_lock);
2262    journal->j_trans_id = (unsigned long) 1;
2263    INIT_LIST_HEAD(&journal->j_la_cleanups);
2264    INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
2265    journal->j_state = OCFS2_JOURNAL_FREE;
2266
2267    INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
2268    osb->dentry_lock_list = NULL;
2269
2270    /* get some pseudo constants for clustersize bits */
2271    osb->s_clustersize_bits =
2272        le32_to_cpu(di->id2.i_super.s_clustersize_bits);
2273    osb->s_clustersize = 1 << osb->s_clustersize_bits;
2274
2275    if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
2276        osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
2277        mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
2278             osb->s_clustersize);
2279        status = -EINVAL;
2280        goto bail;
2281    }
2282
2283    total_blocks = ocfs2_clusters_to_blocks(osb->sb,
2284                        le32_to_cpu(di->i_clusters));
2285
2286    status = generic_check_addressable(osb->sb->s_blocksize_bits,
2287                       total_blocks);
2288    if (status) {
2289        mlog(ML_ERROR, "Volume too large "
2290             "to mount safely on this system");
2291        status = -EFBIG;
2292        goto bail;
2293    }
2294
2295    if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
2296                 sizeof(di->id2.i_super.s_uuid))) {
2297        mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
2298        status = -ENOMEM;
2299        goto bail;
2300    }
2301
2302    memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
2303
2304    strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
2305    osb->vol_label[63] = '\0';
2306    osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
2307    osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
2308    osb->first_cluster_group_blkno =
2309        le64_to_cpu(di->id2.i_super.s_first_cluster_group);
2310    osb->fs_generation = le32_to_cpu(di->i_fs_generation);
2311    osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
2312    trace_ocfs2_initialize_super(osb->vol_label, osb->uuid_str,
2313                     (unsigned long long)osb->root_blkno,
2314                     (unsigned long long)osb->system_dir_blkno,
2315                     osb->s_clustersize_bits);
2316
2317    osb->osb_dlm_debug = ocfs2_new_dlm_debug();
2318    if (!osb->osb_dlm_debug) {
2319        status = -ENOMEM;
2320        mlog_errno(status);
2321        goto bail;
2322    }
2323
2324    atomic_set(&osb->vol_state, VOLUME_INIT);
2325
2326    /* load root, system_dir, and all global system inodes */
2327    status = ocfs2_init_global_system_inodes(osb);
2328    if (status < 0) {
2329        mlog_errno(status);
2330        goto bail;
2331    }
2332
2333    /*
2334     * global bitmap
2335     */
2336    inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
2337                        OCFS2_INVALID_SLOT);
2338    if (!inode) {
2339        status = -EINVAL;
2340        mlog_errno(status);
2341        goto bail;
2342    }
2343
2344    osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
2345    osb->osb_clusters_at_boot = OCFS2_I(inode)->ip_clusters;
2346    iput(inode);
2347
2348    osb->bitmap_cpg = ocfs2_group_bitmap_size(sb, 0,
2349                 osb->s_feature_incompat) * 8;
2350
2351    status = ocfs2_init_slot_info(osb);
2352    if (status < 0) {
2353        mlog_errno(status);
2354        goto bail;
2355    }
2356    cleancache_init_shared_fs((char *)&uuid_net_key, sb);
2357
2358bail:
2359    return status;
2360}
2361
2362/*
2363 * will return: -EAGAIN if it is ok to keep searching for superblocks
2364 * -EINVAL if there is a bad superblock
2365 * 0 on success
2366 */
2367static int ocfs2_verify_volume(struct ocfs2_dinode *di,
2368                   struct buffer_head *bh,
2369                   u32 blksz,
2370                   struct ocfs2_blockcheck_stats *stats)
2371{
2372    int status = -EAGAIN;
2373
2374    if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
2375           strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
2376        /* We have to do a raw check of the feature here */
2377        if (le32_to_cpu(di->id2.i_super.s_feature_incompat) &
2378            OCFS2_FEATURE_INCOMPAT_META_ECC) {
2379            status = ocfs2_block_check_validate(bh->b_data,
2380                                bh->b_size,
2381                                &di->i_check,
2382                                stats);
2383            if (status)
2384                goto out;
2385        }
2386        status = -EINVAL;
2387        if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
2388            mlog(ML_ERROR, "found superblock with incorrect block "
2389                 "size: found %u, should be %u\n",
2390                 1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
2391                   blksz);
2392        } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
2393               OCFS2_MAJOR_REV_LEVEL ||
2394               le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
2395               OCFS2_MINOR_REV_LEVEL) {
2396            mlog(ML_ERROR, "found superblock with bad version: "
2397                 "found %u.%u, should be %u.%u\n",
2398                 le16_to_cpu(di->id2.i_super.s_major_rev_level),
2399                 le16_to_cpu(di->id2.i_super.s_minor_rev_level),
2400                 OCFS2_MAJOR_REV_LEVEL,
2401                 OCFS2_MINOR_REV_LEVEL);
2402        } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
2403            mlog(ML_ERROR, "bad block number on superblock: "
2404                 "found %llu, should be %llu\n",
2405                 (unsigned long long)le64_to_cpu(di->i_blkno),
2406                 (unsigned long long)bh->b_blocknr);
2407        } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
2408                le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
2409            mlog(ML_ERROR, "bad cluster size found: %u\n",
2410                 1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
2411        } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
2412            mlog(ML_ERROR, "bad root_blkno: 0\n");
2413        } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
2414            mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
2415        } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
2416            mlog(ML_ERROR,
2417                 "Superblock slots found greater than file system "
2418                 "maximum: found %u, max %u\n",
2419                 le16_to_cpu(di->id2.i_super.s_max_slots),
2420                 OCFS2_MAX_SLOTS);
2421        } else {
2422            /* found it! */
2423            status = 0;
2424        }
2425    }
2426
2427out:
2428    if (status && status != -EAGAIN)
2429        mlog_errno(status);
2430    return status;
2431}
2432
2433static int ocfs2_check_volume(struct ocfs2_super *osb)
2434{
2435    int status;
2436    int dirty;
2437    int local;
2438    struct ocfs2_dinode *local_alloc = NULL; /* only used if we
2439                          * recover
2440                          * ourselves. */
2441
2442    /* Init our journal object. */
2443    status = ocfs2_journal_init(osb->journal, &dirty);
2444    if (status < 0) {
2445        mlog(ML_ERROR, "Could not initialize journal!\n");
2446        goto finally;
2447    }
2448
2449    /* Now that journal has been initialized, check to make sure
2450       entire volume is addressable. */
2451    status = ocfs2_journal_addressable(osb);
2452    if (status)
2453        goto finally;
2454
2455    /* If the journal was unmounted cleanly then we don't want to
2456     * recover anything. Otherwise, journal_load will do that
2457     * dirty work for us :) */
2458    if (!dirty) {
2459        status = ocfs2_journal_wipe(osb->journal, 0);
2460        if (status < 0) {
2461            mlog_errno(status);
2462            goto finally;
2463        }
2464    } else {
2465        mlog(ML_NOTICE, "File system was not unmounted cleanly, "
2466             "recovering volume.\n");
2467    }
2468
2469    local = ocfs2_mount_local(osb);
2470
2471    /* will play back anything left in the journal. */
2472    status = ocfs2_journal_load(osb->journal, local, dirty);
2473    if (status < 0) {
2474        mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
2475        goto finally;
2476    }
2477
2478    if (dirty) {
2479        /* recover my local alloc if we didn't unmount cleanly. */
2480        status = ocfs2_begin_local_alloc_recovery(osb,
2481                              osb->slot_num,
2482                              &local_alloc);
2483        if (status < 0) {
2484            mlog_errno(status);
2485            goto finally;
2486        }
2487        /* we complete the recovery process after we've marked
2488         * ourselves as mounted. */
2489    }
2490
2491    status = ocfs2_load_local_alloc(osb);
2492    if (status < 0) {
2493        mlog_errno(status);
2494        goto finally;
2495    }
2496
2497    if (dirty) {
2498        /* Recovery will be completed after we've mounted the
2499         * rest of the volume. */
2500        osb->dirty = 1;
2501        osb->local_alloc_copy = local_alloc;
2502        local_alloc = NULL;
2503    }
2504
2505    /* go through each journal, trylock it and if you get the
2506     * lock, and it's marked as dirty, set the bit in the recover
2507     * map and launch a recovery thread for it. */
2508    status = ocfs2_mark_dead_nodes(osb);
2509    if (status < 0) {
2510        mlog_errno(status);
2511        goto finally;
2512    }
2513
2514    status = ocfs2_compute_replay_slots(osb);
2515    if (status < 0)
2516        mlog_errno(status);
2517
2518finally:
2519    if (local_alloc)
2520        kfree(local_alloc);
2521
2522    if (status)
2523        mlog_errno(status);
2524    return status;
2525}
2526
2527/*
2528 * The routine gets called from dismount or close whenever a dismount on
2529 * volume is requested and the osb open count becomes 1.
2530 * It will remove the osb from the global list and also free up all the
2531 * initialized resources and fileobject.
2532 */
2533static void ocfs2_delete_osb(struct ocfs2_super *osb)
2534{
2535    /* This function assumes that the caller has the main osb resource */
2536
2537    ocfs2_free_slot_info(osb);
2538
2539    kfree(osb->osb_orphan_wipes);
2540    kfree(osb->slot_recovery_generations);
2541    /* FIXME
2542     * This belongs in journal shutdown, but because we have to
2543     * allocate osb->journal at the start of ocfs2_initialize_osb(),
2544     * we free it here.
2545     */
2546    kfree(osb->journal);
2547    if (osb->local_alloc_copy)
2548        kfree(osb->local_alloc_copy);
2549    kfree(osb->uuid_str);
2550    ocfs2_put_dlm_debug(osb->osb_dlm_debug);
2551    memset(osb, 0, sizeof(struct ocfs2_super));
2552}
2553
2554/* Put OCFS2 into a readonly state, or (if the user specifies it),
2555 * panic(). We do not support continue-on-error operation. */
2556static void ocfs2_handle_error(struct super_block *sb)
2557{
2558    struct ocfs2_super *osb = OCFS2_SB(sb);
2559
2560    if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
2561        panic("OCFS2: (device %s): panic forced after error\n",
2562              sb->s_id);
2563
2564    ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
2565
2566    if (sb->s_flags & MS_RDONLY &&
2567        (ocfs2_is_soft_readonly(osb) ||
2568         ocfs2_is_hard_readonly(osb)))
2569        return;
2570
2571    printk(KERN_CRIT "File system is now read-only due to the potential "
2572           "of on-disk corruption. Please run fsck.ocfs2 once the file "
2573           "system is unmounted.\n");
2574    sb->s_flags |= MS_RDONLY;
2575    ocfs2_set_ro_flag(osb, 0);
2576}
2577
2578static char error_buf[1024];
2579
2580void __ocfs2_error(struct super_block *sb,
2581           const char *function,
2582           const char *fmt, ...)
2583{
2584    va_list args;
2585
2586    va_start(args, fmt);
2587    vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2588    va_end(args);
2589
2590    /* Not using mlog here because we want to show the actual
2591     * function the error came from. */
2592    printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
2593           sb->s_id, function, error_buf);
2594
2595    ocfs2_handle_error(sb);
2596}
2597
2598/* Handle critical errors. This is intentionally more drastic than
2599 * ocfs2_handle_error, so we only use for things like journal errors,
2600 * etc. */
2601void __ocfs2_abort(struct super_block* sb,
2602           const char *function,
2603           const char *fmt, ...)
2604{
2605    va_list args;
2606
2607    va_start(args, fmt);
2608    vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2609    va_end(args);
2610
2611    printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
2612           sb->s_id, function, error_buf);
2613
2614    /* We don't have the cluster support yet to go straight to
2615     * hard readonly in here. Until then, we want to keep
2616     * ocfs2_abort() so that we can at least mark critical
2617     * errors.
2618     *
2619     * TODO: This should abort the journal and alert other nodes
2620     * that our slot needs recovery. */
2621
2622    /* Force a panic(). This stinks, but it's better than letting
2623     * things continue without having a proper hard readonly
2624     * here. */
2625    if (!ocfs2_mount_local(OCFS2_SB(sb)))
2626        OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2627    ocfs2_handle_error(sb);
2628}
2629
2630/*
2631 * Void signal blockers, because in-kernel sigprocmask() only fails
2632 * when SIG_* is wrong.
2633 */
2634void ocfs2_block_signals(sigset_t *oldset)
2635{
2636    int rc;
2637    sigset_t blocked;
2638
2639    sigfillset(&blocked);
2640    rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
2641    BUG_ON(rc);
2642}
2643
2644void ocfs2_unblock_signals(sigset_t *oldset)
2645{
2646    int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
2647    BUG_ON(rc);
2648}
2649
2650module_init(ocfs2_init);
2651module_exit(ocfs2_exit);
2652

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