Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / fs / gfs2 / ops_fstype.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2008 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 "bmap.h"
25 #include "daemon.h"
26 #include "glock.h"
27 #include "glops.h"
28 #include "inode.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 const u32 gfs2_old_fs_formats[] = {
44         0
45 };
46
47 static const u32 gfs2_old_multihost_formats[] = {
48         0
49 };
50
51 /**
52  * gfs2_tune_init - Fill a gfs2_tune structure with default values
53  * @gt: tune
54  *
55  */
56
57 static void gfs2_tune_init(struct gfs2_tune *gt)
58 {
59         spin_lock_init(&gt->gt_spin);
60
61         gt->gt_demote_secs = 300;
62         gt->gt_incore_log_blocks = 1024;
63         gt->gt_log_flush_secs = 60;
64         gt->gt_recoverd_secs = 60;
65         gt->gt_logd_secs = 1;
66         gt->gt_quotad_secs = 5;
67         gt->gt_quota_simul_sync = 64;
68         gt->gt_quota_warn_period = 10;
69         gt->gt_quota_scale_num = 1;
70         gt->gt_quota_scale_den = 1;
71         gt->gt_quota_cache_secs = 300;
72         gt->gt_quota_quantum = 60;
73         gt->gt_new_files_jdata = 0;
74         gt->gt_max_readahead = 1 << 18;
75         gt->gt_stall_secs = 600;
76         gt->gt_complain_secs = 10;
77         gt->gt_statfs_quantum = 30;
78         gt->gt_statfs_slow = 0;
79 }
80
81 static struct gfs2_sbd *init_sbd(struct super_block *sb)
82 {
83         struct gfs2_sbd *sdp;
84
85         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
86         if (!sdp)
87                 return NULL;
88
89         sb->s_fs_info = sdp;
90         sdp->sd_vfs = sb;
91
92         gfs2_tune_init(&sdp->sd_tune);
93
94         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
95         spin_lock_init(&sdp->sd_reclaim_lock);
96         init_waitqueue_head(&sdp->sd_reclaim_wq);
97
98         mutex_init(&sdp->sd_inum_mutex);
99         spin_lock_init(&sdp->sd_statfs_spin);
100
101         spin_lock_init(&sdp->sd_rindex_spin);
102         mutex_init(&sdp->sd_rindex_mutex);
103         INIT_LIST_HEAD(&sdp->sd_rindex_list);
104         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
105
106         INIT_LIST_HEAD(&sdp->sd_jindex_list);
107         spin_lock_init(&sdp->sd_jindex_spin);
108         mutex_init(&sdp->sd_jindex_mutex);
109
110         INIT_LIST_HEAD(&sdp->sd_quota_list);
111         spin_lock_init(&sdp->sd_quota_spin);
112         mutex_init(&sdp->sd_quota_mutex);
113
114         spin_lock_init(&sdp->sd_log_lock);
115
116         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
117         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
118         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
119         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
120         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
121
122         mutex_init(&sdp->sd_log_reserve_mutex);
123         INIT_LIST_HEAD(&sdp->sd_ail1_list);
124         INIT_LIST_HEAD(&sdp->sd_ail2_list);
125
126         init_rwsem(&sdp->sd_log_flush_lock);
127         atomic_set(&sdp->sd_log_in_flight, 0);
128         init_waitqueue_head(&sdp->sd_log_flush_wait);
129
130         INIT_LIST_HEAD(&sdp->sd_revoke_list);
131
132         mutex_init(&sdp->sd_freeze_lock);
133
134         return sdp;
135 }
136
137
138 /**
139  * gfs2_check_sb - Check superblock
140  * @sdp: the filesystem
141  * @sb: The superblock
142  * @silent: Don't print a message if the check fails
143  *
144  * Checks the version code of the FS is one that we understand how to
145  * read and that the sizes of the various on-disk structures have not
146  * changed.
147  */
148
149 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
150 {
151         unsigned int x;
152
153         if (sb->sb_magic != GFS2_MAGIC ||
154             sb->sb_type != GFS2_METATYPE_SB) {
155                 if (!silent)
156                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
157                 return -EINVAL;
158         }
159
160         /*  If format numbers match exactly, we're done.  */
161
162         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
163             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
164                 return 0;
165
166         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
167                 for (x = 0; gfs2_old_fs_formats[x]; x++)
168                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
169                                 break;
170
171                 if (!gfs2_old_fs_formats[x]) {
172                         printk(KERN_WARNING
173                                "GFS2: code version (%u, %u) is incompatible "
174                                "with ondisk format (%u, %u)\n",
175                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
176                                sb->sb_fs_format, sb->sb_multihost_format);
177                         printk(KERN_WARNING
178                                "GFS2: I don't know how to upgrade this FS\n");
179                         return -EINVAL;
180                 }
181         }
182
183         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
184                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
185                         if (gfs2_old_multihost_formats[x] ==
186                             sb->sb_multihost_format)
187                                 break;
188
189                 if (!gfs2_old_multihost_formats[x]) {
190                         printk(KERN_WARNING
191                                "GFS2: code version (%u, %u) is incompatible "
192                                "with ondisk format (%u, %u)\n",
193                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
194                                sb->sb_fs_format, sb->sb_multihost_format);
195                         printk(KERN_WARNING
196                                "GFS2: I don't know how to upgrade this FS\n");
197                         return -EINVAL;
198                 }
199         }
200
201         if (!sdp->sd_args.ar_upgrade) {
202                 printk(KERN_WARNING
203                        "GFS2: code version (%u, %u) is incompatible "
204                        "with ondisk format (%u, %u)\n",
205                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
206                        sb->sb_fs_format, sb->sb_multihost_format);
207                 printk(KERN_INFO
208                        "GFS2: Use the \"upgrade\" mount option to upgrade "
209                        "the FS\n");
210                 printk(KERN_INFO "GFS2: See the manual for more details\n");
211                 return -EINVAL;
212         }
213
214         return 0;
215 }
216
217 static void end_bio_io_page(struct bio *bio, int error)
218 {
219         struct page *page = bio->bi_private;
220
221         if (!error)
222                 SetPageUptodate(page);
223         else
224                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
225         unlock_page(page);
226 }
227
228 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
229 {
230         const struct gfs2_sb *str = buf;
231
232         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
233         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
234         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
235         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
236         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
237         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
238         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
239         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
240         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
241         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
242         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
243
244         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
245         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
246 }
247
248 /**
249  * gfs2_read_super - Read the gfs2 super block from disk
250  * @sdp: The GFS2 super block
251  * @sector: The location of the super block
252  * @error: The error code to return
253  *
254  * This uses the bio functions to read the super block from disk
255  * because we want to be 100% sure that we never read cached data.
256  * A super block is read twice only during each GFS2 mount and is
257  * never written to by the filesystem. The first time its read no
258  * locks are held, and the only details which are looked at are those
259  * relating to the locking protocol. Once locking is up and working,
260  * the sb is read again under the lock to establish the location of
261  * the master directory (contains pointers to journals etc) and the
262  * root directory.
263  *
264  * Returns: 0 on success or error
265  */
266
267 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
268 {
269         struct super_block *sb = sdp->sd_vfs;
270         struct gfs2_sb *p;
271         struct page *page;
272         struct bio *bio;
273
274         page = alloc_page(GFP_NOFS);
275         if (unlikely(!page))
276                 return -ENOBUFS;
277
278         ClearPageUptodate(page);
279         ClearPageDirty(page);
280         lock_page(page);
281
282         bio = bio_alloc(GFP_NOFS, 1);
283         if (unlikely(!bio)) {
284                 __free_page(page);
285                 return -ENOBUFS;
286         }
287
288         bio->bi_sector = sector * (sb->s_blocksize >> 9);
289         bio->bi_bdev = sb->s_bdev;
290         bio_add_page(bio, page, PAGE_SIZE, 0);
291
292         bio->bi_end_io = end_bio_io_page;
293         bio->bi_private = page;
294         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
295         wait_on_page_locked(page);
296         bio_put(bio);
297         if (!PageUptodate(page)) {
298                 __free_page(page);
299                 return -EIO;
300         }
301         p = kmap(page);
302         gfs2_sb_in(&sdp->sd_sb, p);
303         kunmap(page);
304         __free_page(page);
305         return 0;
306 }
307 /**
308  * gfs2_read_sb - Read super block
309  * @sdp: The GFS2 superblock
310  * @gl: the glock for the superblock (assumed to be held)
311  * @silent: Don't print message if mount fails
312  *
313  */
314
315 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
316 {
317         u32 hash_blocks, ind_blocks, leaf_blocks;
318         u32 tmp_blocks;
319         unsigned int x;
320         int error;
321
322         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
323         if (error) {
324                 if (!silent)
325                         fs_err(sdp, "can't read superblock\n");
326                 return error;
327         }
328
329         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
330         if (error)
331                 return error;
332
333         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
334                                GFS2_BASIC_BLOCK_SHIFT;
335         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
336         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
337                           sizeof(struct gfs2_dinode)) / sizeof(u64);
338         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
339                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
340         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
341         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
342         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
343         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
344         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
345                                 sizeof(struct gfs2_meta_header)) /
346                                 sizeof(struct gfs2_quota_change);
347
348         /* Compute maximum reservation required to add a entry to a directory */
349
350         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
351                              sdp->sd_jbsize);
352
353         ind_blocks = 0;
354         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
355                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
356                 ind_blocks += tmp_blocks;
357         }
358
359         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
360
361         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
362
363         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
364                                 sizeof(struct gfs2_dinode);
365         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
366         for (x = 2;; x++) {
367                 u64 space, d;
368                 u32 m;
369
370                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
371                 d = space;
372                 m = do_div(d, sdp->sd_inptrs);
373
374                 if (d != sdp->sd_heightsize[x - 1] || m)
375                         break;
376                 sdp->sd_heightsize[x] = space;
377         }
378         sdp->sd_max_height = x;
379         sdp->sd_heightsize[x] = ~0;
380         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
381
382         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
383                                  sizeof(struct gfs2_dinode);
384         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
385         for (x = 2;; x++) {
386                 u64 space, d;
387                 u32 m;
388
389                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
390                 d = space;
391                 m = do_div(d, sdp->sd_inptrs);
392
393                 if (d != sdp->sd_jheightsize[x - 1] || m)
394                         break;
395                 sdp->sd_jheightsize[x] = space;
396         }
397         sdp->sd_max_jheight = x;
398         sdp->sd_jheightsize[x] = ~0;
399         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
400
401         return 0;
402 }
403
404 static int init_names(struct gfs2_sbd *sdp, int silent)
405 {
406         char *proto, *table;
407         int error = 0;
408
409         proto = sdp->sd_args.ar_lockproto;
410         table = sdp->sd_args.ar_locktable;
411
412         /*  Try to autodetect  */
413
414         if (!proto[0] || !table[0]) {
415                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
416                 if (error)
417                         return error;
418
419                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
420                 if (error)
421                         goto out;
422
423                 if (!proto[0])
424                         proto = sdp->sd_sb.sb_lockproto;
425                 if (!table[0])
426                         table = sdp->sd_sb.sb_locktable;
427         }
428
429         if (!table[0])
430                 table = sdp->sd_vfs->s_id;
431
432         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
433         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
434
435         table = sdp->sd_table_name;
436         while ((table = strchr(table, '/')))
437                 *table = '_';
438
439 out:
440         return error;
441 }
442
443 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
444                         int undo)
445 {
446         struct task_struct *p;
447         int error = 0;
448
449         if (undo)
450                 goto fail_trans;
451
452         for (sdp->sd_glockd_num = 0;
453              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
454              sdp->sd_glockd_num++) {
455                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
456                 error = IS_ERR(p);
457                 if (error) {
458                         fs_err(sdp, "can't start glockd thread: %d\n", error);
459                         goto fail;
460                 }
461                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
462         }
463
464         error = gfs2_glock_nq_num(sdp,
465                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
466                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
467                                   mount_gh);
468         if (error) {
469                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
470                 goto fail;
471         }
472
473         error = gfs2_glock_nq_num(sdp,
474                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
475                                   LM_ST_SHARED,
476                                   LM_FLAG_NOEXP | GL_EXACT,
477                                   &sdp->sd_live_gh);
478         if (error) {
479                 fs_err(sdp, "can't acquire live glock: %d\n", error);
480                 goto fail_mount;
481         }
482
483         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
484                                CREATE, &sdp->sd_rename_gl);
485         if (error) {
486                 fs_err(sdp, "can't create rename glock: %d\n", error);
487                 goto fail_live;
488         }
489
490         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
491                                CREATE, &sdp->sd_trans_gl);
492         if (error) {
493                 fs_err(sdp, "can't create transaction glock: %d\n", error);
494                 goto fail_rename;
495         }
496         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
497
498         return 0;
499
500 fail_trans:
501         gfs2_glock_put(sdp->sd_trans_gl);
502 fail_rename:
503         gfs2_glock_put(sdp->sd_rename_gl);
504 fail_live:
505         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
506 fail_mount:
507         gfs2_glock_dq_uninit(mount_gh);
508 fail:
509         while (sdp->sd_glockd_num--)
510                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
511
512         return error;
513 }
514
515 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
516                             u64 no_addr, const char *name)
517 {
518         struct gfs2_sbd *sdp = sb->s_fs_info;
519         struct dentry *dentry;
520         struct inode *inode;
521
522         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
523         if (IS_ERR(inode)) {
524                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
525                 return PTR_ERR(inode);
526         }
527         dentry = d_alloc_root(inode);
528         if (!dentry) {
529                 fs_err(sdp, "can't alloc %s dentry\n", name);
530                 iput(inode);
531                 return -ENOMEM;
532         }
533         dentry->d_op = &gfs2_dops;
534         *dptr = dentry;
535         return 0;
536 }
537
538 static int init_sb(struct gfs2_sbd *sdp, int silent)
539 {
540         struct super_block *sb = sdp->sd_vfs;
541         struct gfs2_holder sb_gh;
542         u64 no_addr;
543         int ret;
544
545         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
546                                 LM_ST_SHARED, 0, &sb_gh);
547         if (ret) {
548                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
549                 return ret;
550         }
551
552         ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
553         if (ret) {
554                 fs_err(sdp, "can't read superblock: %d\n", ret);
555                 goto out;
556         }
557
558         /* Set up the buffer cache and SB for real */
559         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
560                 ret = -EINVAL;
561                 fs_err(sdp, "FS block size (%u) is too small for device "
562                        "block size (%u)\n",
563                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
564                 goto out;
565         }
566         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
567                 ret = -EINVAL;
568                 fs_err(sdp, "FS block size (%u) is too big for machine "
569                        "page size (%u)\n",
570                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
571                 goto out;
572         }
573         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
574
575         /* Get the root inode */
576         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
577         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
578         if (ret)
579                 goto out;
580
581         /* Get the master inode */
582         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
583         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
584         if (ret) {
585                 dput(sdp->sd_root_dir);
586                 goto out;
587         }
588         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
589 out:
590         gfs2_glock_dq_uninit(&sb_gh);
591         return ret;
592 }
593
594 /**
595  * map_journal_extents - create a reusable "extent" mapping from all logical
596  * blocks to all physical blocks for the given journal.  This will save
597  * us time when writing journal blocks.  Most journals will have only one
598  * extent that maps all their logical blocks.  That's because gfs2.mkfs
599  * arranges the journal blocks sequentially to maximize performance.
600  * So the extent would map the first block for the entire file length.
601  * However, gfs2_jadd can happen while file activity is happening, so
602  * those journals may not be sequential.  Less likely is the case where
603  * the users created their own journals by mounting the metafs and
604  * laying it out.  But it's still possible.  These journals might have
605  * several extents.
606  *
607  * TODO: This should be done in bigger chunks rather than one block at a time,
608  *       but since it's only done at mount time, I'm not worried about the
609  *       time it takes.
610  */
611 static int map_journal_extents(struct gfs2_sbd *sdp)
612 {
613         struct gfs2_jdesc *jd = sdp->sd_jdesc;
614         unsigned int lb;
615         u64 db, prev_db; /* logical block, disk block, prev disk block */
616         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
617         struct gfs2_journal_extent *jext = NULL;
618         struct buffer_head bh;
619         int rc = 0;
620
621         prev_db = 0;
622
623         for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
624                 bh.b_state = 0;
625                 bh.b_blocknr = 0;
626                 bh.b_size = 1 << ip->i_inode.i_blkbits;
627                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
628                 db = bh.b_blocknr;
629                 if (rc || !db) {
630                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
631                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
632                         break;
633                 }
634                 if (!prev_db || db != prev_db + 1) {
635                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
636                                        GFP_KERNEL);
637                         if (!jext) {
638                                 printk(KERN_INFO "GFS2 error: out of memory "
639                                        "mapping journal extents.\n");
640                                 rc = -ENOMEM;
641                                 break;
642                         }
643                         jext->dblock = db;
644                         jext->lblock = lb;
645                         jext->blocks = 1;
646                         list_add_tail(&jext->extent_list, &jd->extent_list);
647                 } else {
648                         jext->blocks++;
649                 }
650                 prev_db = db;
651         }
652         return rc;
653 }
654
655 static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
656 {
657         if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
658                 return;
659         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
660                 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
661                                         sdp->sd_lockstruct.ls_lockspace);
662 }
663
664 static int init_journal(struct gfs2_sbd *sdp, int undo)
665 {
666         struct inode *master = sdp->sd_master_dir->d_inode;
667         struct gfs2_holder ji_gh;
668         struct task_struct *p;
669         struct gfs2_inode *ip;
670         int jindex = 1;
671         int error = 0;
672
673         if (undo) {
674                 jindex = 0;
675                 goto fail_recoverd;
676         }
677
678         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
679         if (IS_ERR(sdp->sd_jindex)) {
680                 fs_err(sdp, "can't lookup journal index: %d\n", error);
681                 return PTR_ERR(sdp->sd_jindex);
682         }
683         ip = GFS2_I(sdp->sd_jindex);
684         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
685
686         /* Load in the journal index special file */
687
688         error = gfs2_jindex_hold(sdp, &ji_gh);
689         if (error) {
690                 fs_err(sdp, "can't read journal index: %d\n", error);
691                 goto fail;
692         }
693
694         error = -EINVAL;
695         if (!gfs2_jindex_size(sdp)) {
696                 fs_err(sdp, "no journals!\n");
697                 goto fail_jindex;
698         }
699
700         if (sdp->sd_args.ar_spectator) {
701                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
702                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
703         } else {
704                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
705                         fs_err(sdp, "can't mount journal #%u\n",
706                                sdp->sd_lockstruct.ls_jid);
707                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
708                                gfs2_jindex_size(sdp),
709                                gfs2_jindex_size(sdp) - 1);
710                         goto fail_jindex;
711                 }
712                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
713
714                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
715                                           &gfs2_journal_glops,
716                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
717                                           &sdp->sd_journal_gh);
718                 if (error) {
719                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
720                         goto fail_jindex;
721                 }
722
723                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
724                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
725                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
726                                            &sdp->sd_jinode_gh);
727                 if (error) {
728                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
729                                error);
730                         goto fail_journal_gh;
731                 }
732
733                 error = gfs2_jdesc_check(sdp->sd_jdesc);
734                 if (error) {
735                         fs_err(sdp, "my journal (%u) is bad: %d\n",
736                                sdp->sd_jdesc->jd_jid, error);
737                         goto fail_jinode_gh;
738                 }
739                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
740
741                 /* Map the extents for this journal's blocks */
742                 map_journal_extents(sdp);
743         }
744
745         if (sdp->sd_lockstruct.ls_first) {
746                 unsigned int x;
747                 for (x = 0; x < sdp->sd_journals; x++) {
748                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
749                         if (error) {
750                                 fs_err(sdp, "error recovering journal %u: %d\n",
751                                        x, error);
752                                 goto fail_jinode_gh;
753                         }
754                 }
755
756                 gfs2_lm_others_may_mount(sdp);
757         } else if (!sdp->sd_args.ar_spectator) {
758                 error = gfs2_recover_journal(sdp->sd_jdesc);
759                 if (error) {
760                         fs_err(sdp, "error recovering my journal: %d\n", error);
761                         goto fail_jinode_gh;
762                 }
763         }
764
765         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
766         gfs2_glock_dq_uninit(&ji_gh);
767         jindex = 0;
768
769         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
770         error = IS_ERR(p);
771         if (error) {
772                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
773                 goto fail_jinode_gh;
774         }
775         sdp->sd_recoverd_process = p;
776
777         return 0;
778
779 fail_recoverd:
780         kthread_stop(sdp->sd_recoverd_process);
781 fail_jinode_gh:
782         if (!sdp->sd_args.ar_spectator)
783                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
784 fail_journal_gh:
785         if (!sdp->sd_args.ar_spectator)
786                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
787 fail_jindex:
788         gfs2_jindex_free(sdp);
789         if (jindex)
790                 gfs2_glock_dq_uninit(&ji_gh);
791 fail:
792         iput(sdp->sd_jindex);
793         return error;
794 }
795
796
797 static int init_inodes(struct gfs2_sbd *sdp, int undo)
798 {
799         int error = 0;
800         struct gfs2_inode *ip;
801         struct inode *master = sdp->sd_master_dir->d_inode;
802
803         if (undo)
804                 goto fail_qinode;
805
806         error = init_journal(sdp, undo);
807         if (error)
808                 goto fail;
809
810         /* Read in the master inode number inode */
811         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
812         if (IS_ERR(sdp->sd_inum_inode)) {
813                 error = PTR_ERR(sdp->sd_inum_inode);
814                 fs_err(sdp, "can't read in inum inode: %d\n", error);
815                 goto fail_journal;
816         }
817
818
819         /* Read in the master statfs inode */
820         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
821         if (IS_ERR(sdp->sd_statfs_inode)) {
822                 error = PTR_ERR(sdp->sd_statfs_inode);
823                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
824                 goto fail_inum;
825         }
826
827         /* Read in the resource index inode */
828         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
829         if (IS_ERR(sdp->sd_rindex)) {
830                 error = PTR_ERR(sdp->sd_rindex);
831                 fs_err(sdp, "can't get resource index inode: %d\n", error);
832                 goto fail_statfs;
833         }
834         ip = GFS2_I(sdp->sd_rindex);
835         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
836         sdp->sd_rindex_uptodate = 0;
837
838         /* Read in the quota inode */
839         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
840         if (IS_ERR(sdp->sd_quota_inode)) {
841                 error = PTR_ERR(sdp->sd_quota_inode);
842                 fs_err(sdp, "can't get quota file inode: %d\n", error);
843                 goto fail_rindex;
844         }
845         return 0;
846
847 fail_qinode:
848         iput(sdp->sd_quota_inode);
849 fail_rindex:
850         gfs2_clear_rgrpd(sdp);
851         iput(sdp->sd_rindex);
852 fail_statfs:
853         iput(sdp->sd_statfs_inode);
854 fail_inum:
855         iput(sdp->sd_inum_inode);
856 fail_journal:
857         init_journal(sdp, UNDO);
858 fail:
859         return error;
860 }
861
862 static int init_per_node(struct gfs2_sbd *sdp, int undo)
863 {
864         struct inode *pn = NULL;
865         char buf[30];
866         int error = 0;
867         struct gfs2_inode *ip;
868         struct inode *master = sdp->sd_master_dir->d_inode;
869
870         if (sdp->sd_args.ar_spectator)
871                 return 0;
872
873         if (undo)
874                 goto fail_qc_gh;
875
876         pn = gfs2_lookup_simple(master, "per_node");
877         if (IS_ERR(pn)) {
878                 error = PTR_ERR(pn);
879                 fs_err(sdp, "can't find per_node directory: %d\n", error);
880                 return error;
881         }
882
883         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
884         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
885         if (IS_ERR(sdp->sd_ir_inode)) {
886                 error = PTR_ERR(sdp->sd_ir_inode);
887                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
888                 goto fail;
889         }
890
891         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
892         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
893         if (IS_ERR(sdp->sd_sc_inode)) {
894                 error = PTR_ERR(sdp->sd_sc_inode);
895                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
896                 goto fail_ir_i;
897         }
898
899         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
900         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
901         if (IS_ERR(sdp->sd_qc_inode)) {
902                 error = PTR_ERR(sdp->sd_qc_inode);
903                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
904                 goto fail_ut_i;
905         }
906
907         iput(pn);
908         pn = NULL;
909
910         ip = GFS2_I(sdp->sd_ir_inode);
911         error = gfs2_glock_nq_init(ip->i_gl,
912                                    LM_ST_EXCLUSIVE, 0,
913                                    &sdp->sd_ir_gh);
914         if (error) {
915                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
916                 goto fail_qc_i;
917         }
918
919         ip = GFS2_I(sdp->sd_sc_inode);
920         error = gfs2_glock_nq_init(ip->i_gl,
921                                    LM_ST_EXCLUSIVE, 0,
922                                    &sdp->sd_sc_gh);
923         if (error) {
924                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
925                 goto fail_ir_gh;
926         }
927
928         ip = GFS2_I(sdp->sd_qc_inode);
929         error = gfs2_glock_nq_init(ip->i_gl,
930                                    LM_ST_EXCLUSIVE, 0,
931                                    &sdp->sd_qc_gh);
932         if (error) {
933                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
934                 goto fail_ut_gh;
935         }
936
937         return 0;
938
939 fail_qc_gh:
940         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
941 fail_ut_gh:
942         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
943 fail_ir_gh:
944         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
945 fail_qc_i:
946         iput(sdp->sd_qc_inode);
947 fail_ut_i:
948         iput(sdp->sd_sc_inode);
949 fail_ir_i:
950         iput(sdp->sd_ir_inode);
951 fail:
952         if (pn)
953                 iput(pn);
954         return error;
955 }
956
957 static int init_threads(struct gfs2_sbd *sdp, int undo)
958 {
959         struct task_struct *p;
960         int error = 0;
961
962         if (undo)
963                 goto fail_quotad;
964
965         sdp->sd_log_flush_time = jiffies;
966         sdp->sd_jindex_refresh_time = jiffies;
967
968         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
969         error = IS_ERR(p);
970         if (error) {
971                 fs_err(sdp, "can't start logd thread: %d\n", error);
972                 return error;
973         }
974         sdp->sd_logd_process = p;
975
976         sdp->sd_statfs_sync_time = jiffies;
977         sdp->sd_quota_sync_time = jiffies;
978
979         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
980         error = IS_ERR(p);
981         if (error) {
982                 fs_err(sdp, "can't start quotad thread: %d\n", error);
983                 goto fail;
984         }
985         sdp->sd_quotad_process = p;
986
987         return 0;
988
989
990 fail_quotad:
991         kthread_stop(sdp->sd_quotad_process);
992 fail:
993         kthread_stop(sdp->sd_logd_process);
994         return error;
995 }
996
997 /**
998  * gfs2_lm_mount - mount a locking protocol
999  * @sdp: the filesystem
1000  * @args: mount arguements
1001  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1002  *
1003  * Returns: errno
1004  */
1005
1006 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1007 {
1008         char *proto = sdp->sd_proto_name;
1009         char *table = sdp->sd_table_name;
1010         int flags = LM_MFLAG_CONV_NODROP;
1011         int error;
1012
1013         if (sdp->sd_args.ar_spectator)
1014                 flags |= LM_MFLAG_SPECTATOR;
1015
1016         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1017
1018         error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
1019                                      gfs2_glock_cb, sdp,
1020                                      GFS2_MIN_LVB_SIZE, flags,
1021                                      &sdp->sd_lockstruct, &sdp->sd_kobj);
1022         if (error) {
1023                 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
1024                         proto, table, sdp->sd_args.ar_hostdata);
1025                 goto out;
1026         }
1027
1028         if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
1029             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
1030                                   GFS2_MIN_LVB_SIZE)) {
1031                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1032                 goto out;
1033         }
1034
1035         if (sdp->sd_args.ar_spectator)
1036                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1037         else
1038                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1039                          sdp->sd_lockstruct.ls_jid);
1040
1041         fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1042
1043         if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
1044             !sdp->sd_args.ar_ignore_local_fs) {
1045                 sdp->sd_args.ar_localflocks = 1;
1046                 sdp->sd_args.ar_localcaching = 1;
1047         }
1048
1049 out:
1050         return error;
1051 }
1052
1053 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1054 {
1055         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
1056                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1057 }
1058
1059 /**
1060  * fill_super - Read in superblock
1061  * @sb: The VFS superblock
1062  * @data: Mount options
1063  * @silent: Don't complain if it's not a GFS2 filesystem
1064  *
1065  * Returns: errno
1066  */
1067
1068 static int fill_super(struct super_block *sb, void *data, int silent)
1069 {
1070         struct gfs2_sbd *sdp;
1071         struct gfs2_holder mount_gh;
1072         int error;
1073
1074         sdp = init_sbd(sb);
1075         if (!sdp) {
1076                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1077                 return -ENOMEM;
1078         }
1079
1080         error = gfs2_mount_args(sdp, (char *)data, 0);
1081         if (error) {
1082                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1083                 goto fail;
1084         }
1085
1086         sb->s_magic = GFS2_MAGIC;
1087         sb->s_op = &gfs2_super_ops;
1088         sb->s_export_op = &gfs2_export_ops;
1089         sb->s_time_gran = 1;
1090         sb->s_maxbytes = MAX_LFS_FILESIZE;
1091
1092         /* Set up the buffer cache and fill in some fake block size values
1093            to allow us to read-in the on-disk superblock. */
1094         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1095         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1096         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1097                                GFS2_BASIC_BLOCK_SHIFT;
1098         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1099
1100         error = init_names(sdp, silent);
1101         if (error)
1102                 goto fail;
1103
1104         gfs2_create_debugfs_file(sdp);
1105
1106         error = gfs2_sys_fs_add(sdp);
1107         if (error)
1108                 goto fail;
1109
1110         error = gfs2_lm_mount(sdp, silent);
1111         if (error)
1112                 goto fail_sys;
1113
1114         error = init_locking(sdp, &mount_gh, DO);
1115         if (error)
1116                 goto fail_lm;
1117
1118         error = init_sb(sdp, silent);
1119         if (error)
1120                 goto fail_locking;
1121
1122         error = init_inodes(sdp, DO);
1123         if (error)
1124                 goto fail_sb;
1125
1126         error = init_per_node(sdp, DO);
1127         if (error)
1128                 goto fail_inodes;
1129
1130         error = gfs2_statfs_init(sdp);
1131         if (error) {
1132                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1133                 goto fail_per_node;
1134         }
1135
1136         error = init_threads(sdp, DO);
1137         if (error)
1138                 goto fail_per_node;
1139
1140         if (!(sb->s_flags & MS_RDONLY)) {
1141                 error = gfs2_make_fs_rw(sdp);
1142                 if (error) {
1143                         fs_err(sdp, "can't make FS RW: %d\n", error);
1144                         goto fail_threads;
1145                 }
1146         }
1147
1148         gfs2_glock_dq_uninit(&mount_gh);
1149
1150         return 0;
1151
1152 fail_threads:
1153         init_threads(sdp, UNDO);
1154 fail_per_node:
1155         init_per_node(sdp, UNDO);
1156 fail_inodes:
1157         init_inodes(sdp, UNDO);
1158 fail_sb:
1159         if (sdp->sd_root_dir)
1160                 dput(sdp->sd_root_dir);
1161         if (sdp->sd_master_dir)
1162                 dput(sdp->sd_master_dir);
1163         sb->s_root = NULL;
1164 fail_locking:
1165         init_locking(sdp, &mount_gh, UNDO);
1166 fail_lm:
1167         gfs2_gl_hash_clear(sdp);
1168         gfs2_lm_unmount(sdp);
1169         while (invalidate_inodes(sb))
1170                 yield();
1171 fail_sys:
1172         gfs2_sys_fs_del(sdp);
1173 fail:
1174         gfs2_delete_debugfs_file(sdp);
1175         kfree(sdp);
1176         sb->s_fs_info = NULL;
1177         return error;
1178 }
1179
1180 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1181                        const char *dev_name, void *data, struct vfsmount *mnt)
1182 {
1183         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1184 }
1185
1186 static struct super_block *get_gfs2_sb(const char *dev_name)
1187 {
1188         struct super_block *sb;
1189         struct nameidata nd;
1190         int error;
1191
1192         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1193         if (error) {
1194                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1195                        dev_name, error);
1196                 return NULL;
1197         }
1198         sb = nd.path.dentry->d_inode->i_sb;
1199         if (sb && (sb->s_type == &gfs2_fs_type))
1200                 atomic_inc(&sb->s_active);
1201         else
1202                 sb = NULL;
1203         path_put(&nd.path);
1204         return sb;
1205 }
1206
1207 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1208                             const char *dev_name, void *data, struct vfsmount *mnt)
1209 {
1210         struct super_block *sb = NULL;
1211         struct gfs2_sbd *sdp;
1212
1213         sb = get_gfs2_sb(dev_name);
1214         if (!sb) {
1215                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1216                 return -ENOENT;
1217         }
1218         sdp = sb->s_fs_info;
1219         mnt->mnt_sb = sb;
1220         mnt->mnt_root = dget(sdp->sd_master_dir);
1221         return 0;
1222 }
1223
1224 static void gfs2_kill_sb(struct super_block *sb)
1225 {
1226         struct gfs2_sbd *sdp = sb->s_fs_info;
1227         if (sdp) {
1228                 gfs2_meta_syncfs(sdp);
1229                 dput(sdp->sd_root_dir);
1230                 dput(sdp->sd_master_dir);
1231                 sdp->sd_root_dir = NULL;
1232                 sdp->sd_master_dir = NULL;
1233         }
1234         shrink_dcache_sb(sb);
1235         kill_block_super(sb);
1236         if (sdp)
1237                 gfs2_delete_debugfs_file(sdp);
1238 }
1239
1240 struct file_system_type gfs2_fs_type = {
1241         .name = "gfs2",
1242         .fs_flags = FS_REQUIRES_DEV,
1243         .get_sb = gfs2_get_sb,
1244         .kill_sb = gfs2_kill_sb,
1245         .owner = THIS_MODULE,
1246 };
1247
1248 struct file_system_type gfs2meta_fs_type = {
1249         .name = "gfs2meta",
1250         .fs_flags = FS_REQUIRES_DEV,
1251         .get_sb = gfs2_get_sb_meta,
1252         .owner = THIS_MODULE,
1253 };
1254