[GFS2] Export lm_interface to kernel headers
[linux-2.6] / 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_export.h"
31 #include "ops_fstype.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
39 #define DO 0
40 #define UNDO 1
41
42 extern struct dentry_operations gfs2_dops;
43
44 static struct gfs2_sbd *init_sbd(struct super_block *sb)
45 {
46         struct gfs2_sbd *sdp;
47
48         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
49         if (!sdp)
50                 return NULL;
51
52         sb->s_fs_info = sdp;
53         sdp->sd_vfs = sb;
54
55         gfs2_tune_init(&sdp->sd_tune);
56
57         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
58         spin_lock_init(&sdp->sd_reclaim_lock);
59         init_waitqueue_head(&sdp->sd_reclaim_wq);
60
61         mutex_init(&sdp->sd_inum_mutex);
62         spin_lock_init(&sdp->sd_statfs_spin);
63         mutex_init(&sdp->sd_statfs_mutex);
64
65         spin_lock_init(&sdp->sd_rindex_spin);
66         mutex_init(&sdp->sd_rindex_mutex);
67         INIT_LIST_HEAD(&sdp->sd_rindex_list);
68         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
69         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
70
71         INIT_LIST_HEAD(&sdp->sd_jindex_list);
72         spin_lock_init(&sdp->sd_jindex_spin);
73         mutex_init(&sdp->sd_jindex_mutex);
74
75         INIT_LIST_HEAD(&sdp->sd_quota_list);
76         spin_lock_init(&sdp->sd_quota_spin);
77         mutex_init(&sdp->sd_quota_mutex);
78
79         spin_lock_init(&sdp->sd_log_lock);
80
81         INIT_LIST_HEAD(&sdp->sd_log_le_gl);
82         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
83         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
84         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
85         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
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         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
93
94         INIT_LIST_HEAD(&sdp->sd_revoke_list);
95
96         mutex_init(&sdp->sd_freeze_lock);
97
98         return sdp;
99 }
100
101 static void init_vfs(struct super_block *sb, unsigned noatime)
102 {
103         struct gfs2_sbd *sdp = sb->s_fs_info;
104
105         sb->s_magic = GFS2_MAGIC;
106         sb->s_op = &gfs2_super_ops;
107         sb->s_export_op = &gfs2_export_ops;
108         sb->s_maxbytes = MAX_LFS_FILESIZE;
109
110         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
111                 set_bit(noatime, &sdp->sd_flags);
112
113         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
114         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
115 }
116
117 static int init_names(struct gfs2_sbd *sdp, int silent)
118 {
119         struct gfs2_sb *sb = NULL;
120         char *proto, *table;
121         int error = 0;
122
123         proto = sdp->sd_args.ar_lockproto;
124         table = sdp->sd_args.ar_locktable;
125
126         /*  Try to autodetect  */
127
128         if (!proto[0] || !table[0]) {
129                 struct buffer_head *bh;
130                 bh = sb_getblk(sdp->sd_vfs,
131                                GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
132                 lock_buffer(bh);
133                 clear_buffer_uptodate(bh);
134                 clear_buffer_dirty(bh);
135                 unlock_buffer(bh);
136                 ll_rw_block(READ, 1, &bh);
137                 wait_on_buffer(bh);
138
139                 if (!buffer_uptodate(bh)) {
140                         brelse(bh);
141                         return -EIO;
142                 }
143
144                 sb = kmalloc(sizeof(struct gfs2_sb), GFP_KERNEL);
145                 if (!sb) {
146                         brelse(bh);
147                         return -ENOMEM;
148                 }
149                 gfs2_sb_in(sb, bh->b_data); 
150                 brelse(bh);
151
152                 error = gfs2_check_sb(sdp, sb, silent);
153                 if (error)
154                         goto out;
155
156                 if (!proto[0])
157                         proto = sb->sb_lockproto;
158                 if (!table[0])
159                         table = sb->sb_locktable;
160         }
161
162         if (!table[0])
163                 table = sdp->sd_vfs->s_id;
164
165         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
166         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
167
168 out:
169         kfree(sb);
170         return error;
171 }
172
173 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
174                         int undo)
175 {
176         struct task_struct *p;
177         int error = 0;
178
179         if (undo)
180                 goto fail_trans;
181
182         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
183         error = IS_ERR(p);
184         if (error) {
185                 fs_err(sdp, "can't start scand thread: %d\n", error);
186                 return error;
187         }
188         sdp->sd_scand_process = p;
189
190         for (sdp->sd_glockd_num = 0;
191              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
192              sdp->sd_glockd_num++) {
193                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
194                 error = IS_ERR(p);
195                 if (error) {
196                         fs_err(sdp, "can't start glockd thread: %d\n", error);
197                         goto fail;
198                 }
199                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
200         }
201
202         error = gfs2_glock_nq_num(sdp,
203                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
204                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
205                                   mount_gh);
206         if (error) {
207                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
208                 goto fail;
209         }
210
211         error = gfs2_glock_nq_num(sdp,
212                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
213                                   LM_ST_SHARED,
214                                   LM_FLAG_NOEXP | GL_EXACT,
215                                   &sdp->sd_live_gh);
216         if (error) {
217                 fs_err(sdp, "can't acquire live glock: %d\n", error);
218                 goto fail_mount;
219         }
220
221         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
222                                CREATE, &sdp->sd_rename_gl);
223         if (error) {
224                 fs_err(sdp, "can't create rename glock: %d\n", error);
225                 goto fail_live;
226         }
227
228         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
229                                CREATE, &sdp->sd_trans_gl);
230         if (error) {
231                 fs_err(sdp, "can't create transaction glock: %d\n", error);
232                 goto fail_rename;
233         }
234         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
235
236         return 0;
237
238 fail_trans:
239         gfs2_glock_put(sdp->sd_trans_gl);
240 fail_rename:
241         gfs2_glock_put(sdp->sd_rename_gl);
242 fail_live:
243         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
244 fail_mount:
245         gfs2_glock_dq_uninit(mount_gh);
246 fail:
247         while (sdp->sd_glockd_num--)
248                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
249
250         kthread_stop(sdp->sd_scand_process);
251         return error;
252 }
253
254 static struct inode *gfs2_lookup_root(struct super_block *sb,
255                                       struct gfs2_inum *inum)
256 {
257         return gfs2_inode_lookup(sb, inum, DT_DIR);
258 }
259
260 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
261 {
262         struct super_block *sb = sdp->sd_vfs;
263         struct gfs2_holder sb_gh;
264         struct gfs2_inum *inum;
265         struct inode *inode;
266         int error = 0;
267
268         if (undo) {
269                 if (sb->s_root) {
270                         dput(sb->s_root);
271                         sb->s_root = NULL;
272                 }
273                 return 0;
274         }
275         
276         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
277                                  LM_ST_SHARED, 0, &sb_gh);
278         if (error) {
279                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
280                 return error;
281         }
282
283         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
284         if (error) {
285                 fs_err(sdp, "can't read superblock: %d\n", error);
286                 goto out;
287         }
288
289         /* Set up the buffer cache and SB for real */
290         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
291                 error = -EINVAL;
292                 fs_err(sdp, "FS block size (%u) is too small for device "
293                        "block size (%u)\n",
294                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
295                 goto out;
296         }
297         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
298                 error = -EINVAL;
299                 fs_err(sdp, "FS block size (%u) is too big for machine "
300                        "page size (%u)\n",
301                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
302                 goto out;
303         }
304         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
305
306         /* Get the root inode */
307         inum = &sdp->sd_sb.sb_root_dir;
308         if (sb->s_type == &gfs2meta_fs_type)
309                 inum = &sdp->sd_sb.sb_master_dir;
310         inode = gfs2_lookup_root(sb, inum);
311         if (IS_ERR(inode)) {
312                 error = PTR_ERR(inode);
313                 fs_err(sdp, "can't read in root inode: %d\n", error);
314                 goto out;
315         }
316
317         sb->s_root = d_alloc_root(inode);
318         if (!sb->s_root) {
319                 fs_err(sdp, "can't get root dentry\n");
320                 error = -ENOMEM;
321                 iput(inode);
322         }
323         sb->s_root->d_op = &gfs2_dops;
324 out:
325         gfs2_glock_dq_uninit(&sb_gh);
326         return error;
327 }
328
329 static int init_journal(struct gfs2_sbd *sdp, int undo)
330 {
331         struct gfs2_holder ji_gh;
332         struct task_struct *p;
333         struct gfs2_inode *ip;
334         int jindex = 1;
335         int error = 0;
336
337         if (undo) {
338                 jindex = 0;
339                 goto fail_recoverd;
340         }
341
342         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
343         if (IS_ERR(sdp->sd_jindex)) {
344                 fs_err(sdp, "can't lookup journal index: %d\n", error);
345                 return PTR_ERR(sdp->sd_jindex);
346         }
347         ip = GFS2_I(sdp->sd_jindex);
348         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
349
350         /* Load in the journal index special file */
351
352         error = gfs2_jindex_hold(sdp, &ji_gh);
353         if (error) {
354                 fs_err(sdp, "can't read journal index: %d\n", error);
355                 goto fail;
356         }
357
358         error = -EINVAL;
359         if (!gfs2_jindex_size(sdp)) {
360                 fs_err(sdp, "no journals!\n");
361                 goto fail_jindex;               
362         }
363
364         if (sdp->sd_args.ar_spectator) {
365                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
366                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
367         } else {
368                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
369                         fs_err(sdp, "can't mount journal #%u\n",
370                                sdp->sd_lockstruct.ls_jid);
371                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
372                                gfs2_jindex_size(sdp),
373                                gfs2_jindex_size(sdp) - 1);
374                         goto fail_jindex;
375                 }
376                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
377
378                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
379                                           &gfs2_journal_glops,
380                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
381                                           &sdp->sd_journal_gh);
382                 if (error) {
383                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
384                         goto fail_jindex;
385                 }
386
387                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
388                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
389                                            LM_FLAG_NOEXP | GL_EXACT,
390                                            &sdp->sd_jinode_gh);
391                 if (error) {
392                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
393                                error);
394                         goto fail_journal_gh;
395                 }
396
397                 error = gfs2_jdesc_check(sdp->sd_jdesc);
398                 if (error) {
399                         fs_err(sdp, "my journal (%u) is bad: %d\n",
400                                sdp->sd_jdesc->jd_jid, error);
401                         goto fail_jinode_gh;
402                 }
403                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
404         }
405
406         if (sdp->sd_lockstruct.ls_first) {
407                 unsigned int x;
408                 for (x = 0; x < sdp->sd_journals; x++) {
409                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
410                         if (error) {
411                                 fs_err(sdp, "error recovering journal %u: %d\n",
412                                        x, error);
413                                 goto fail_jinode_gh;
414                         }
415                 }
416
417                 gfs2_lm_others_may_mount(sdp);
418         } else if (!sdp->sd_args.ar_spectator) {
419                 error = gfs2_recover_journal(sdp->sd_jdesc);
420                 if (error) {
421                         fs_err(sdp, "error recovering my journal: %d\n", error);
422                         goto fail_jinode_gh;
423                 }
424         }
425
426         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
427         gfs2_glock_dq_uninit(&ji_gh);
428         jindex = 0;
429
430         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
431         error = IS_ERR(p);
432         if (error) {
433                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
434                 goto fail_jinode_gh;
435         }
436         sdp->sd_recoverd_process = p;
437
438         return 0;
439
440 fail_recoverd:
441         kthread_stop(sdp->sd_recoverd_process);
442 fail_jinode_gh:
443         if (!sdp->sd_args.ar_spectator)
444                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
445 fail_journal_gh:
446         if (!sdp->sd_args.ar_spectator)
447                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
448 fail_jindex:
449         gfs2_jindex_free(sdp);
450         if (jindex)
451                 gfs2_glock_dq_uninit(&ji_gh);
452 fail:
453         iput(sdp->sd_jindex);
454         return error;
455 }
456
457
458 static int init_inodes(struct gfs2_sbd *sdp, int undo)
459 {
460         int error = 0;
461         struct gfs2_inode *ip;
462         struct inode *inode;
463
464         if (undo)
465                 goto fail_qinode;
466
467         inode = gfs2_lookup_root(sdp->sd_vfs, &sdp->sd_sb.sb_master_dir);
468         if (IS_ERR(inode)) {
469                 error = PTR_ERR(inode);
470                 fs_err(sdp, "can't read in master directory: %d\n", error);
471                 goto fail;
472         }
473         sdp->sd_master_dir = inode;
474
475         error = init_journal(sdp, undo);
476         if (error)
477                 goto fail_master;
478
479         /* Read in the master inode number inode */
480         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
481         if (IS_ERR(sdp->sd_inum_inode)) {
482                 error = PTR_ERR(sdp->sd_inum_inode);
483                 fs_err(sdp, "can't read in inum inode: %d\n", error);
484                 goto fail_journal;
485         }
486
487
488         /* Read in the master statfs inode */
489         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
490         if (IS_ERR(sdp->sd_statfs_inode)) {
491                 error = PTR_ERR(sdp->sd_statfs_inode);
492                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
493                 goto fail_inum;
494         }
495
496         /* Read in the resource index inode */
497         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
498         if (IS_ERR(sdp->sd_rindex)) {
499                 error = PTR_ERR(sdp->sd_rindex);
500                 fs_err(sdp, "can't get resource index inode: %d\n", error);
501                 goto fail_statfs;
502         }
503         ip = GFS2_I(sdp->sd_rindex);
504         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
505         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
506
507         /* Read in the quota inode */
508         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
509         if (IS_ERR(sdp->sd_quota_inode)) {
510                 error = PTR_ERR(sdp->sd_quota_inode);
511                 fs_err(sdp, "can't get quota file inode: %d\n", error);
512                 goto fail_rindex;
513         }
514         return 0;
515
516 fail_qinode:
517         iput(sdp->sd_quota_inode);
518 fail_rindex:
519         gfs2_clear_rgrpd(sdp);
520         iput(sdp->sd_rindex);
521 fail_statfs:
522         iput(sdp->sd_statfs_inode);
523 fail_inum:
524         iput(sdp->sd_inum_inode);
525 fail_journal:
526         init_journal(sdp, UNDO);
527 fail_master:
528         iput(sdp->sd_master_dir);
529 fail:
530         return error;
531 }
532
533 static int init_per_node(struct gfs2_sbd *sdp, int undo)
534 {
535         struct inode *pn = NULL;
536         char buf[30];
537         int error = 0;
538         struct gfs2_inode *ip;
539
540         if (sdp->sd_args.ar_spectator)
541                 return 0;
542
543         if (undo)
544                 goto fail_qc_gh;
545
546         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
547         if (IS_ERR(pn)) {
548                 error = PTR_ERR(pn);
549                 fs_err(sdp, "can't find per_node directory: %d\n", error);
550                 return error;
551         }
552
553         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
554         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
555         if (IS_ERR(sdp->sd_ir_inode)) {
556                 error = PTR_ERR(sdp->sd_ir_inode);
557                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
558                 goto fail;
559         }
560
561         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
562         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
563         if (IS_ERR(sdp->sd_sc_inode)) {
564                 error = PTR_ERR(sdp->sd_sc_inode);
565                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
566                 goto fail_ir_i;
567         }
568
569         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
570         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
571         if (IS_ERR(sdp->sd_qc_inode)) {
572                 error = PTR_ERR(sdp->sd_qc_inode);
573                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
574                 goto fail_ut_i;
575         }
576
577         iput(pn);
578         pn = NULL;
579
580         ip = GFS2_I(sdp->sd_ir_inode);
581         error = gfs2_glock_nq_init(ip->i_gl,
582                                    LM_ST_EXCLUSIVE, 0,
583                                    &sdp->sd_ir_gh);
584         if (error) {
585                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
586                 goto fail_qc_i;
587         }
588
589         ip = GFS2_I(sdp->sd_sc_inode);
590         error = gfs2_glock_nq_init(ip->i_gl,
591                                    LM_ST_EXCLUSIVE, 0,
592                                    &sdp->sd_sc_gh);
593         if (error) {
594                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
595                 goto fail_ir_gh;
596         }
597
598         ip = GFS2_I(sdp->sd_qc_inode);
599         error = gfs2_glock_nq_init(ip->i_gl,
600                                    LM_ST_EXCLUSIVE, 0,
601                                    &sdp->sd_qc_gh);
602         if (error) {
603                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
604                 goto fail_ut_gh;
605         }
606
607         return 0;
608
609 fail_qc_gh:
610         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
611 fail_ut_gh:
612         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
613 fail_ir_gh:
614         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
615 fail_qc_i:
616         iput(sdp->sd_qc_inode);
617 fail_ut_i:
618         iput(sdp->sd_sc_inode);
619 fail_ir_i:
620         iput(sdp->sd_ir_inode);
621 fail:
622         if (pn)
623                 iput(pn);
624         return error;
625 }
626
627 static int init_threads(struct gfs2_sbd *sdp, int undo)
628 {
629         struct task_struct *p;
630         int error = 0;
631
632         if (undo)
633                 goto fail_quotad;
634
635         sdp->sd_log_flush_time = jiffies;
636         sdp->sd_jindex_refresh_time = jiffies;
637
638         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
639         error = IS_ERR(p);
640         if (error) {
641                 fs_err(sdp, "can't start logd thread: %d\n", error);
642                 return error;
643         }
644         sdp->sd_logd_process = p;
645
646         sdp->sd_statfs_sync_time = jiffies;
647         sdp->sd_quota_sync_time = jiffies;
648
649         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
650         error = IS_ERR(p);
651         if (error) {
652                 fs_err(sdp, "can't start quotad thread: %d\n", error);
653                 goto fail;
654         }
655         sdp->sd_quotad_process = p;
656
657         return 0;
658
659
660 fail_quotad:
661         kthread_stop(sdp->sd_quotad_process);
662 fail:
663         kthread_stop(sdp->sd_logd_process);
664         return error;
665 }
666
667 /**
668  * fill_super - Read in superblock
669  * @sb: The VFS superblock
670  * @data: Mount options
671  * @silent: Don't complain if it's not a GFS2 filesystem
672  *
673  * Returns: errno
674  */
675
676 static int fill_super(struct super_block *sb, void *data, int silent)
677 {
678         struct gfs2_sbd *sdp;
679         struct gfs2_holder mount_gh;
680         int error;
681
682         sdp = init_sbd(sb);
683         if (!sdp) {
684                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
685                 return -ENOMEM;
686         }
687
688         error = gfs2_mount_args(sdp, (char *)data, 0);
689         if (error) {
690                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
691                 goto fail;
692         }
693
694         init_vfs(sb, SDF_NOATIME);
695
696         /* Set up the buffer cache and fill in some fake block size values
697            to allow us to read-in the on-disk superblock. */
698         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
699         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
700         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
701                                GFS2_BASIC_BLOCK_SHIFT;
702         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
703
704         error = init_names(sdp, silent);
705         if (error)
706                 goto fail;
707
708         error = gfs2_sys_fs_add(sdp);
709         if (error)
710                 goto fail;
711
712         error = gfs2_lm_mount(sdp, silent);
713         if (error)
714                 goto fail_sys;
715
716         error = init_locking(sdp, &mount_gh, DO);
717         if (error)
718                 goto fail_lm;
719
720         error = init_sb(sdp, silent, DO);
721         if (error)
722                 goto fail_locking;
723
724         error = init_inodes(sdp, DO);
725         if (error)
726                 goto fail_sb;
727
728         error = init_per_node(sdp, DO);
729         if (error)
730                 goto fail_inodes;
731
732         error = gfs2_statfs_init(sdp);
733         if (error) {
734                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
735                 goto fail_per_node;
736         }
737
738         error = init_threads(sdp, DO);
739         if (error)
740                 goto fail_per_node;
741
742         if (!(sb->s_flags & MS_RDONLY)) {
743                 error = gfs2_make_fs_rw(sdp);
744                 if (error) {
745                         fs_err(sdp, "can't make FS RW: %d\n", error);
746                         goto fail_threads;
747                 }
748         }
749
750         gfs2_glock_dq_uninit(&mount_gh);
751
752         return 0;
753
754 fail_threads:
755         init_threads(sdp, UNDO);
756 fail_per_node:
757         init_per_node(sdp, UNDO);
758 fail_inodes:
759         init_inodes(sdp, UNDO);
760 fail_sb:
761         init_sb(sdp, 0, UNDO);
762 fail_locking:
763         init_locking(sdp, &mount_gh, UNDO);
764 fail_lm:
765         gfs2_gl_hash_clear(sdp, WAIT);
766         gfs2_lm_unmount(sdp);
767         while (invalidate_inodes(sb))
768                 yield();
769 fail_sys:
770         gfs2_sys_fs_del(sdp);
771 fail:
772         kfree(sdp);
773         sb->s_fs_info = NULL;
774         return error;
775 }
776
777 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
778                 const char *dev_name, void *data, struct vfsmount *mnt)
779 {
780         struct super_block *sb;
781         struct gfs2_sbd *sdp;
782         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
783         if (error)
784                 goto out;
785         sb = mnt->mnt_sb;
786         sdp = sb->s_fs_info;
787         sdp->sd_gfs2mnt = mnt;
788 out:
789         return error;
790 }
791
792 static int fill_super_meta(struct super_block *sb, struct super_block *new, 
793                            void *data, int silent)
794 {
795         struct gfs2_sbd *sdp = sb->s_fs_info;
796         struct inode *inode;
797         int error = 0;
798
799         new->s_fs_info = sdp;
800         sdp->sd_vfs_meta = sb;
801
802         init_vfs(new, SDF_NOATIME);
803
804         /* Get the master inode */
805         inode = igrab(sdp->sd_master_dir);
806
807         new->s_root = d_alloc_root(inode);
808         if (!new->s_root) {
809                 fs_err(sdp, "can't get root dentry\n");
810                 error = -ENOMEM;
811                 iput(inode);
812         }
813         new->s_root->d_op = &gfs2_dops;
814
815         return error;
816 }
817
818 static int set_bdev_super(struct super_block *s, void *data)
819 {
820         s->s_bdev = data;
821         s->s_dev = s->s_bdev->bd_dev;
822         return 0;
823 }
824  
825 static int test_bdev_super(struct super_block *s, void *data)
826 {
827         return s->s_bdev == data;
828 }
829
830 static struct super_block* get_gfs2_sb(const char *dev_name)
831 {
832         struct kstat stat;
833         struct nameidata nd;
834         struct file_system_type *fstype;
835         struct super_block *sb = NULL, *s;
836         struct list_head *l;
837         int error;
838         
839         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
840         if (error) {
841                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n", 
842                        dev_name);
843                 goto out;
844         }
845         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
846
847         fstype = get_fs_type("gfs2");
848         list_for_each(l, &fstype->fs_supers) {
849                 s = list_entry(l, struct super_block, s_instances);
850                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
851                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
852                         sb = s;
853                         goto free_nd;
854                 }
855         }
856
857         printk(KERN_WARNING "GFS2: Unrecognized block device or "
858                "mount point %s", dev_name);
859
860 free_nd:
861         path_release(&nd);
862 out:
863         return sb;
864 }
865
866 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
867                             const char *dev_name, void *data, struct vfsmount *mnt)
868 {
869         int error = 0;
870         struct super_block *sb = NULL, *new;
871         struct gfs2_sbd *sdp;
872         char *gfs2mnt = NULL;
873
874         sb = get_gfs2_sb(dev_name);
875         if (!sb) {
876                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
877                 error = -ENOENT;
878                 goto error;
879         }
880         sdp = (struct gfs2_sbd*) sb->s_fs_info;
881         if (sdp->sd_vfs_meta) {
882                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
883                 error = -EBUSY;
884                 goto error;
885         }
886         mutex_lock(&sb->s_bdev->bd_mount_mutex);
887         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
888         mutex_unlock(&sb->s_bdev->bd_mount_mutex);
889         if (IS_ERR(new)) {
890                 error = PTR_ERR(new);
891                 goto error;
892         }
893         module_put(fs_type->owner);
894         new->s_flags = flags;
895         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
896         sb_set_blocksize(new, sb->s_blocksize);
897         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
898         if (error) {
899                 up_write(&new->s_umount);
900                 deactivate_super(new);
901                 goto error;
902         }
903         
904         new->s_flags |= MS_ACTIVE;
905         
906         /* Grab a reference to the gfs2 mount point */
907         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
908         return simple_set_mnt(mnt, new);
909 error:
910         if (gfs2mnt)
911                 kfree(gfs2mnt);
912         return error;
913 }
914
915 static void gfs2_kill_sb(struct super_block *sb)
916 {
917         kill_block_super(sb);
918 }
919
920 static void gfs2_kill_sb_meta(struct super_block *sb)
921 {
922         struct gfs2_sbd *sdp = sb->s_fs_info;
923         generic_shutdown_super(sb);
924         sdp->sd_vfs_meta = NULL;
925         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
926 }
927
928 struct file_system_type gfs2_fs_type = {
929         .name = "gfs2",
930         .fs_flags = FS_REQUIRES_DEV,
931         .get_sb = gfs2_get_sb,
932         .kill_sb = gfs2_kill_sb,
933         .owner = THIS_MODULE,
934 };
935
936 struct file_system_type gfs2meta_fs_type = {
937         .name = "gfs2meta",
938         .fs_flags = FS_REQUIRES_DEV,
939         .get_sb = gfs2_get_sb_meta,
940         .kill_sb = gfs2_kill_sb_meta,
941         .owner = THIS_MODULE,
942 };
943