[GFS2] Clean up journaled data writing
[linux-2.6.git] / fs / gfs2 / ops_fstype.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/blkdev.h>
16 #include <linux/kthread.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/lm_interface.h>
21
22 #include "gfs2.h"
23 #include "incore.h"
24 #include "daemon.h"
25 #include "glock.h"
26 #include "glops.h"
27 #include "inode.h"
28 #include "lm.h"
29 #include "mount.h"
30 #include "ops_fstype.h"
31 #include "ops_dentry.h"
32 #include "ops_super.h"
33 #include "recovery.h"
34 #include "rgrp.h"
35 #include "super.h"
36 #include "sys.h"
37 #include "util.h"
38 #include "log.h"
39
40 #define DO 0
41 #define UNDO 1
42
43 static struct gfs2_sbd *init_sbd(struct super_block *sb)
44 {
45         struct gfs2_sbd *sdp;
46
47         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
48         if (!sdp)
49                 return NULL;
50
51         sb->s_fs_info = sdp;
52         sdp->sd_vfs = sb;
53
54         gfs2_tune_init(&sdp->sd_tune);
55
56         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
57         spin_lock_init(&sdp->sd_reclaim_lock);
58         init_waitqueue_head(&sdp->sd_reclaim_wq);
59
60         mutex_init(&sdp->sd_inum_mutex);
61         spin_lock_init(&sdp->sd_statfs_spin);
62         mutex_init(&sdp->sd_statfs_mutex);
63
64         spin_lock_init(&sdp->sd_rindex_spin);
65         mutex_init(&sdp->sd_rindex_mutex);
66         INIT_LIST_HEAD(&sdp->sd_rindex_list);
67         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
68         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
69
70         INIT_LIST_HEAD(&sdp->sd_jindex_list);
71         spin_lock_init(&sdp->sd_jindex_spin);
72         mutex_init(&sdp->sd_jindex_mutex);
73
74         INIT_LIST_HEAD(&sdp->sd_quota_list);
75         spin_lock_init(&sdp->sd_quota_spin);
76         mutex_init(&sdp->sd_quota_mutex);
77
78         spin_lock_init(&sdp->sd_log_lock);
79
80         INIT_LIST_HEAD(&sdp->sd_log_le_gl);
81         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
82         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
83         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
84         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
85         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
86
87         mutex_init(&sdp->sd_log_reserve_mutex);
88         INIT_LIST_HEAD(&sdp->sd_ail1_list);
89         INIT_LIST_HEAD(&sdp->sd_ail2_list);
90
91         init_rwsem(&sdp->sd_log_flush_lock);
92         atomic_set(&sdp->sd_log_in_flight, 0);
93         init_waitqueue_head(&sdp->sd_log_flush_wait);
94
95         INIT_LIST_HEAD(&sdp->sd_revoke_list);
96
97         mutex_init(&sdp->sd_freeze_lock);
98
99         return sdp;
100 }
101
102 static void init_vfs(struct super_block *sb, unsigned noatime)
103 {
104         struct gfs2_sbd *sdp = sb->s_fs_info;
105
106         sb->s_magic = GFS2_MAGIC;
107         sb->s_op = &gfs2_super_ops;
108         sb->s_export_op = &gfs2_export_ops;
109         sb->s_time_gran = 1;
110         sb->s_maxbytes = MAX_LFS_FILESIZE;
111
112         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
113                 set_bit(noatime, &sdp->sd_flags);
114
115         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
116         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
117 }
118
119 static int init_names(struct gfs2_sbd *sdp, int silent)
120 {
121         char *proto, *table;
122         int error = 0;
123
124         proto = sdp->sd_args.ar_lockproto;
125         table = sdp->sd_args.ar_locktable;
126
127         /*  Try to autodetect  */
128
129         if (!proto[0] || !table[0]) {
130                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
131                 if (error)
132                         return error;
133
134                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
135                 if (error)
136                         goto out;
137
138                 if (!proto[0])
139                         proto = sdp->sd_sb.sb_lockproto;
140                 if (!table[0])
141                         table = sdp->sd_sb.sb_locktable;
142         }
143
144         if (!table[0])
145                 table = sdp->sd_vfs->s_id;
146
147         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
148         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
149
150         table = sdp->sd_table_name;
151         while ((table = strchr(table, '/')))
152                 *table = '_';
153
154 out:
155         return error;
156 }
157
158 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
159                         int undo)
160 {
161         struct task_struct *p;
162         int error = 0;
163
164         if (undo)
165                 goto fail_trans;
166
167         for (sdp->sd_glockd_num = 0;
168              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
169              sdp->sd_glockd_num++) {
170                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
171                 error = IS_ERR(p);
172                 if (error) {
173                         fs_err(sdp, "can't start glockd thread: %d\n", error);
174                         goto fail;
175                 }
176                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
177         }
178
179         error = gfs2_glock_nq_num(sdp,
180                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
181                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
182                                   mount_gh);
183         if (error) {
184                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
185                 goto fail;
186         }
187
188         error = gfs2_glock_nq_num(sdp,
189                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
190                                   LM_ST_SHARED,
191                                   LM_FLAG_NOEXP | GL_EXACT,
192                                   &sdp->sd_live_gh);
193         if (error) {
194                 fs_err(sdp, "can't acquire live glock: %d\n", error);
195                 goto fail_mount;
196         }
197
198         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
199                                CREATE, &sdp->sd_rename_gl);
200         if (error) {
201                 fs_err(sdp, "can't create rename glock: %d\n", error);
202                 goto fail_live;
203         }
204
205         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
206                                CREATE, &sdp->sd_trans_gl);
207         if (error) {
208                 fs_err(sdp, "can't create transaction glock: %d\n", error);
209                 goto fail_rename;
210         }
211         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
212
213         return 0;
214
215 fail_trans:
216         gfs2_glock_put(sdp->sd_trans_gl);
217 fail_rename:
218         gfs2_glock_put(sdp->sd_rename_gl);
219 fail_live:
220         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
221 fail_mount:
222         gfs2_glock_dq_uninit(mount_gh);
223 fail:
224         while (sdp->sd_glockd_num--)
225                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
226
227         return error;
228 }
229
230 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
231                                              u64 no_addr)
232 {
233         return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
234 }
235
236 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
237 {
238         struct super_block *sb = sdp->sd_vfs;
239         struct gfs2_holder sb_gh;
240         u64 no_addr;
241         struct inode *inode;
242         int error = 0;
243
244         if (undo) {
245                 if (sb->s_root) {
246                         dput(sb->s_root);
247                         sb->s_root = NULL;
248                 }
249                 return 0;
250         }
251
252         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
253                                  LM_ST_SHARED, 0, &sb_gh);
254         if (error) {
255                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
256                 return error;
257         }
258
259         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
260         if (error) {
261                 fs_err(sdp, "can't read superblock: %d\n", error);
262                 goto out;
263         }
264
265         /* Set up the buffer cache and SB for real */
266         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
267                 error = -EINVAL;
268                 fs_err(sdp, "FS block size (%u) is too small for device "
269                        "block size (%u)\n",
270                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
271                 goto out;
272         }
273         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
274                 error = -EINVAL;
275                 fs_err(sdp, "FS block size (%u) is too big for machine "
276                        "page size (%u)\n",
277                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
278                 goto out;
279         }
280         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
281
282         /* Get the root inode */
283         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
284         if (sb->s_type == &gfs2meta_fs_type)
285                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
286         inode = gfs2_lookup_root(sb, no_addr);
287         if (IS_ERR(inode)) {
288                 error = PTR_ERR(inode);
289                 fs_err(sdp, "can't read in root inode: %d\n", error);
290                 goto out;
291         }
292
293         sb->s_root = d_alloc_root(inode);
294         if (!sb->s_root) {
295                 fs_err(sdp, "can't get root dentry\n");
296                 error = -ENOMEM;
297                 iput(inode);
298         } else
299                 sb->s_root->d_op = &gfs2_dops;
300         
301 out:
302         gfs2_glock_dq_uninit(&sb_gh);
303         return error;
304 }
305
306 static int init_journal(struct gfs2_sbd *sdp, int undo)
307 {
308         struct gfs2_holder ji_gh;
309         struct task_struct *p;
310         struct gfs2_inode *ip;
311         int jindex = 1;
312         int error = 0;
313
314         if (undo) {
315                 jindex = 0;
316                 goto fail_recoverd;
317         }
318
319         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
320         if (IS_ERR(sdp->sd_jindex)) {
321                 fs_err(sdp, "can't lookup journal index: %d\n", error);
322                 return PTR_ERR(sdp->sd_jindex);
323         }
324         ip = GFS2_I(sdp->sd_jindex);
325         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
326
327         /* Load in the journal index special file */
328
329         error = gfs2_jindex_hold(sdp, &ji_gh);
330         if (error) {
331                 fs_err(sdp, "can't read journal index: %d\n", error);
332                 goto fail;
333         }
334
335         error = -EINVAL;
336         if (!gfs2_jindex_size(sdp)) {
337                 fs_err(sdp, "no journals!\n");
338                 goto fail_jindex;
339         }
340
341         if (sdp->sd_args.ar_spectator) {
342                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
343                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
344         } else {
345                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
346                         fs_err(sdp, "can't mount journal #%u\n",
347                                sdp->sd_lockstruct.ls_jid);
348                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
349                                gfs2_jindex_size(sdp),
350                                gfs2_jindex_size(sdp) - 1);
351                         goto fail_jindex;
352                 }
353                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
354
355                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
356                                           &gfs2_journal_glops,
357                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
358                                           &sdp->sd_journal_gh);
359                 if (error) {
360                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
361                         goto fail_jindex;
362                 }
363
364                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
365                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
366                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
367                                            &sdp->sd_jinode_gh);
368                 if (error) {
369                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
370                                error);
371                         goto fail_journal_gh;
372                 }
373
374                 error = gfs2_jdesc_check(sdp->sd_jdesc);
375                 if (error) {
376                         fs_err(sdp, "my journal (%u) is bad: %d\n",
377                                sdp->sd_jdesc->jd_jid, error);
378                         goto fail_jinode_gh;
379                 }
380                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
381         }
382
383         if (sdp->sd_lockstruct.ls_first) {
384                 unsigned int x;
385                 for (x = 0; x < sdp->sd_journals; x++) {
386                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
387                         if (error) {
388                                 fs_err(sdp, "error recovering journal %u: %d\n",
389                                        x, error);
390                                 goto fail_jinode_gh;
391                         }
392                 }
393
394                 gfs2_lm_others_may_mount(sdp);
395         } else if (!sdp->sd_args.ar_spectator) {
396                 error = gfs2_recover_journal(sdp->sd_jdesc);
397                 if (error) {
398                         fs_err(sdp, "error recovering my journal: %d\n", error);
399                         goto fail_jinode_gh;
400                 }
401         }
402
403         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
404         gfs2_glock_dq_uninit(&ji_gh);
405         jindex = 0;
406
407         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
408         error = IS_ERR(p);
409         if (error) {
410                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
411                 goto fail_jinode_gh;
412         }
413         sdp->sd_recoverd_process = p;
414
415         return 0;
416
417 fail_recoverd:
418         kthread_stop(sdp->sd_recoverd_process);
419 fail_jinode_gh:
420         if (!sdp->sd_args.ar_spectator)
421                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
422 fail_journal_gh:
423         if (!sdp->sd_args.ar_spectator)
424                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
425 fail_jindex:
426         gfs2_jindex_free(sdp);
427         if (jindex)
428                 gfs2_glock_dq_uninit(&ji_gh);
429 fail:
430         iput(sdp->sd_jindex);
431         return error;
432 }
433
434
435 static int init_inodes(struct gfs2_sbd *sdp, int undo)
436 {
437         int error = 0;
438         struct gfs2_inode *ip;
439         struct inode *inode;
440
441         if (undo)
442                 goto fail_qinode;
443
444         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
445         if (IS_ERR(inode)) {
446                 error = PTR_ERR(inode);
447                 fs_err(sdp, "can't read in master directory: %d\n", error);
448                 goto fail;
449         }
450         sdp->sd_master_dir = inode;
451
452         error = init_journal(sdp, undo);
453         if (error)
454                 goto fail_master;
455
456         /* Read in the master inode number inode */
457         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
458         if (IS_ERR(sdp->sd_inum_inode)) {
459                 error = PTR_ERR(sdp->sd_inum_inode);
460                 fs_err(sdp, "can't read in inum inode: %d\n", error);
461                 goto fail_journal;
462         }
463
464
465         /* Read in the master statfs inode */
466         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
467         if (IS_ERR(sdp->sd_statfs_inode)) {
468                 error = PTR_ERR(sdp->sd_statfs_inode);
469                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
470                 goto fail_inum;
471         }
472
473         /* Read in the resource index inode */
474         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
475         if (IS_ERR(sdp->sd_rindex)) {
476                 error = PTR_ERR(sdp->sd_rindex);
477                 fs_err(sdp, "can't get resource index inode: %d\n", error);
478                 goto fail_statfs;
479         }
480         ip = GFS2_I(sdp->sd_rindex);
481         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
482         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
483
484         /* Read in the quota inode */
485         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
486         if (IS_ERR(sdp->sd_quota_inode)) {
487                 error = PTR_ERR(sdp->sd_quota_inode);
488                 fs_err(sdp, "can't get quota file inode: %d\n", error);
489                 goto fail_rindex;
490         }
491         return 0;
492
493 fail_qinode:
494         iput(sdp->sd_quota_inode);
495 fail_rindex:
496         gfs2_clear_rgrpd(sdp);
497         iput(sdp->sd_rindex);
498 fail_statfs:
499         iput(sdp->sd_statfs_inode);
500 fail_inum:
501         iput(sdp->sd_inum_inode);
502 fail_journal:
503         init_journal(sdp, UNDO);
504 fail_master:
505         iput(sdp->sd_master_dir);
506 fail:
507         return error;
508 }
509
510 static int init_per_node(struct gfs2_sbd *sdp, int undo)
511 {
512         struct inode *pn = NULL;
513         char buf[30];
514         int error = 0;
515         struct gfs2_inode *ip;
516
517         if (sdp->sd_args.ar_spectator)
518                 return 0;
519
520         if (undo)
521                 goto fail_qc_gh;
522
523         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
524         if (IS_ERR(pn)) {
525                 error = PTR_ERR(pn);
526                 fs_err(sdp, "can't find per_node directory: %d\n", error);
527                 return error;
528         }
529
530         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
531         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
532         if (IS_ERR(sdp->sd_ir_inode)) {
533                 error = PTR_ERR(sdp->sd_ir_inode);
534                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
535                 goto fail;
536         }
537
538         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
539         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
540         if (IS_ERR(sdp->sd_sc_inode)) {
541                 error = PTR_ERR(sdp->sd_sc_inode);
542                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
543                 goto fail_ir_i;
544         }
545
546         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
547         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
548         if (IS_ERR(sdp->sd_qc_inode)) {
549                 error = PTR_ERR(sdp->sd_qc_inode);
550                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
551                 goto fail_ut_i;
552         }
553
554         iput(pn);
555         pn = NULL;
556
557         ip = GFS2_I(sdp->sd_ir_inode);
558         error = gfs2_glock_nq_init(ip->i_gl,
559                                    LM_ST_EXCLUSIVE, 0,
560                                    &sdp->sd_ir_gh);
561         if (error) {
562                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
563                 goto fail_qc_i;
564         }
565
566         ip = GFS2_I(sdp->sd_sc_inode);
567         error = gfs2_glock_nq_init(ip->i_gl,
568                                    LM_ST_EXCLUSIVE, 0,
569                                    &sdp->sd_sc_gh);
570         if (error) {
571                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
572                 goto fail_ir_gh;
573         }
574
575         ip = GFS2_I(sdp->sd_qc_inode);
576         error = gfs2_glock_nq_init(ip->i_gl,
577                                    LM_ST_EXCLUSIVE, 0,
578                                    &sdp->sd_qc_gh);
579         if (error) {
580                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
581                 goto fail_ut_gh;
582         }
583
584         return 0;
585
586 fail_qc_gh:
587         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
588 fail_ut_gh:
589         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
590 fail_ir_gh:
591         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
592 fail_qc_i:
593         iput(sdp->sd_qc_inode);
594 fail_ut_i:
595         iput(sdp->sd_sc_inode);
596 fail_ir_i:
597         iput(sdp->sd_ir_inode);
598 fail:
599         if (pn)
600                 iput(pn);
601         return error;
602 }
603
604 static int init_threads(struct gfs2_sbd *sdp, int undo)
605 {
606         struct task_struct *p;
607         int error = 0;
608
609         if (undo)
610                 goto fail_quotad;
611
612         sdp->sd_log_flush_time = jiffies;
613         sdp->sd_jindex_refresh_time = jiffies;
614
615         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
616         error = IS_ERR(p);
617         if (error) {
618                 fs_err(sdp, "can't start logd thread: %d\n", error);
619                 return error;
620         }
621         sdp->sd_logd_process = p;
622
623         sdp->sd_statfs_sync_time = jiffies;
624         sdp->sd_quota_sync_time = jiffies;
625
626         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
627         error = IS_ERR(p);
628         if (error) {
629                 fs_err(sdp, "can't start quotad thread: %d\n", error);
630                 goto fail;
631         }
632         sdp->sd_quotad_process = p;
633
634         return 0;
635
636
637 fail_quotad:
638         kthread_stop(sdp->sd_quotad_process);
639 fail:
640         kthread_stop(sdp->sd_logd_process);
641         return error;
642 }
643
644 /**
645  * fill_super - Read in superblock
646  * @sb: The VFS superblock
647  * @data: Mount options
648  * @silent: Don't complain if it's not a GFS2 filesystem
649  *
650  * Returns: errno
651  */
652
653 static int fill_super(struct super_block *sb, void *data, int silent)
654 {
655         struct gfs2_sbd *sdp;
656         struct gfs2_holder mount_gh;
657         int error;
658
659         sdp = init_sbd(sb);
660         if (!sdp) {
661                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
662                 return -ENOMEM;
663         }
664
665         error = gfs2_mount_args(sdp, (char *)data, 0);
666         if (error) {
667                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
668                 goto fail;
669         }
670
671         init_vfs(sb, SDF_NOATIME);
672
673         /* Set up the buffer cache and fill in some fake block size values
674            to allow us to read-in the on-disk superblock. */
675         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
676         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
677         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
678                                GFS2_BASIC_BLOCK_SHIFT;
679         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
680
681         error = init_names(sdp, silent);
682         if (error)
683                 goto fail;
684
685         gfs2_create_debugfs_file(sdp);
686
687         error = gfs2_sys_fs_add(sdp);
688         if (error)
689                 goto fail;
690
691         error = gfs2_lm_mount(sdp, silent);
692         if (error)
693                 goto fail_sys;
694
695         error = init_locking(sdp, &mount_gh, DO);
696         if (error)
697                 goto fail_lm;
698
699         error = init_sb(sdp, silent, DO);
700         if (error)
701                 goto fail_locking;
702
703         error = init_inodes(sdp, DO);
704         if (error)
705                 goto fail_sb;
706
707         error = init_per_node(sdp, DO);
708         if (error)
709                 goto fail_inodes;
710
711         error = gfs2_statfs_init(sdp);
712         if (error) {
713                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
714                 goto fail_per_node;
715         }
716
717         error = init_threads(sdp, DO);
718         if (error)
719                 goto fail_per_node;
720
721         if (!(sb->s_flags & MS_RDONLY)) {
722                 error = gfs2_make_fs_rw(sdp);
723                 if (error) {
724                         fs_err(sdp, "can't make FS RW: %d\n", error);
725                         goto fail_threads;
726                 }
727         }
728
729         gfs2_glock_dq_uninit(&mount_gh);
730
731         return 0;
732
733 fail_threads:
734         init_threads(sdp, UNDO);
735 fail_per_node:
736         init_per_node(sdp, UNDO);
737 fail_inodes:
738         init_inodes(sdp, UNDO);
739 fail_sb:
740         init_sb(sdp, 0, UNDO);
741 fail_locking:
742         init_locking(sdp, &mount_gh, UNDO);
743 fail_lm:
744         gfs2_gl_hash_clear(sdp, WAIT);
745         gfs2_lm_unmount(sdp);
746         while (invalidate_inodes(sb))
747                 yield();
748 fail_sys:
749         gfs2_sys_fs_del(sdp);
750 fail:
751         gfs2_delete_debugfs_file(sdp);
752         kfree(sdp);
753         sb->s_fs_info = NULL;
754         return error;
755 }
756
757 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
758                 const char *dev_name, void *data, struct vfsmount *mnt)
759 {
760         struct super_block *sb;
761         struct gfs2_sbd *sdp;
762         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
763         if (error)
764                 goto out;
765         sb = mnt->mnt_sb;
766         sdp = sb->s_fs_info;
767         sdp->sd_gfs2mnt = mnt;
768 out:
769         return error;
770 }
771
772 static int fill_super_meta(struct super_block *sb, struct super_block *new,
773                            void *data, int silent)
774 {
775         struct gfs2_sbd *sdp = sb->s_fs_info;
776         struct inode *inode;
777         int error = 0;
778
779         new->s_fs_info = sdp;
780         sdp->sd_vfs_meta = sb;
781
782         init_vfs(new, SDF_NOATIME);
783
784         /* Get the master inode */
785         inode = igrab(sdp->sd_master_dir);
786
787         new->s_root = d_alloc_root(inode);
788         if (!new->s_root) {
789                 fs_err(sdp, "can't get root dentry\n");
790                 error = -ENOMEM;
791                 iput(inode);
792         } else
793                 new->s_root->d_op = &gfs2_dops;
794
795         return error;
796 }
797
798 static int set_bdev_super(struct super_block *s, void *data)
799 {
800         s->s_bdev = data;
801         s->s_dev = s->s_bdev->bd_dev;
802         return 0;
803 }
804
805 static int test_bdev_super(struct super_block *s, void *data)
806 {
807         return s->s_bdev == data;
808 }
809
810 static struct super_block* get_gfs2_sb(const char *dev_name)
811 {
812         struct kstat stat;
813         struct nameidata nd;
814         struct file_system_type *fstype;
815         struct super_block *sb = NULL, *s;
816         int error;
817
818         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
819         if (error) {
820                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
821                        dev_name);
822                 goto out;
823         }
824         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
825
826         fstype = get_fs_type("gfs2");
827         list_for_each_entry(s, &fstype->fs_supers, s_instances) {
828                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
829                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
830                         sb = s;
831                         goto free_nd;
832                 }
833         }
834
835         printk(KERN_WARNING "GFS2: Unrecognized block device or "
836                "mount point %s\n", dev_name);
837
838 free_nd:
839         path_release(&nd);
840 out:
841         return sb;
842 }
843
844 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
845                             const char *dev_name, void *data, struct vfsmount *mnt)
846 {
847         int error = 0;
848         struct super_block *sb = NULL, *new;
849         struct gfs2_sbd *sdp;
850
851         sb = get_gfs2_sb(dev_name);
852         if (!sb) {
853                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
854                 error = -ENOENT;
855                 goto error;
856         }
857         sdp = sb->s_fs_info;
858         if (sdp->sd_vfs_meta) {
859                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
860                 error = -EBUSY;
861                 goto error;
862         }
863         down(&sb->s_bdev->bd_mount_sem);
864         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
865         up(&sb->s_bdev->bd_mount_sem);
866         if (IS_ERR(new)) {
867                 error = PTR_ERR(new);
868                 goto error;
869         }
870         module_put(fs_type->owner);
871         new->s_flags = flags;
872         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
873         sb_set_blocksize(new, sb->s_blocksize);
874         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
875         if (error) {
876                 up_write(&new->s_umount);
877                 deactivate_super(new);
878                 goto error;
879         }
880
881         new->s_flags |= MS_ACTIVE;
882
883         /* Grab a reference to the gfs2 mount point */
884         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
885         return simple_set_mnt(mnt, new);
886 error:
887         return error;
888 }
889
890 static void gfs2_kill_sb(struct super_block *sb)
891 {
892         if (sb->s_fs_info) {
893                 gfs2_delete_debugfs_file(sb->s_fs_info);
894                 gfs2_meta_syncfs(sb->s_fs_info);
895         }
896         kill_block_super(sb);
897 }
898
899 static void gfs2_kill_sb_meta(struct super_block *sb)
900 {
901         struct gfs2_sbd *sdp = sb->s_fs_info;
902         generic_shutdown_super(sb);
903         sdp->sd_vfs_meta = NULL;
904         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
905 }
906
907 struct file_system_type gfs2_fs_type = {
908         .name = "gfs2",
909         .fs_flags = FS_REQUIRES_DEV,
910         .get_sb = gfs2_get_sb,
911         .kill_sb = gfs2_kill_sb,
912         .owner = THIS_MODULE,
913 };
914
915 struct file_system_type gfs2meta_fs_type = {
916         .name = "gfs2meta",
917         .fs_flags = FS_REQUIRES_DEV,
918         .get_sb = gfs2_get_sb_meta,
919         .kill_sb = gfs2_kill_sb_meta,
920         .owner = THIS_MODULE,
921 };
922