GFS2: Add online uevent to GFS2
[linux-2.6.git] / fs / gfs2 / ops_fstype.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2008 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/slow-work.h>
21
22 #include "gfs2.h"
23 #include "incore.h"
24 #include "bmap.h"
25 #include "glock.h"
26 #include "glops.h"
27 #include "inode.h"
28 #include "recovery.h"
29 #include "rgrp.h"
30 #include "super.h"
31 #include "sys.h"
32 #include "util.h"
33 #include "log.h"
34 #include "quota.h"
35 #include "dir.h"
36 #include "trace_gfs2.h"
37
38 #define DO 0
39 #define UNDO 1
40
41 static const u32 gfs2_old_fs_formats[] = {
42         0
43 };
44
45 static const u32 gfs2_old_multihost_formats[] = {
46         0
47 };
48
49 /**
50  * gfs2_tune_init - Fill a gfs2_tune structure with default values
51  * @gt: tune
52  *
53  */
54
55 static void gfs2_tune_init(struct gfs2_tune *gt)
56 {
57         spin_lock_init(&gt->gt_spin);
58
59         gt->gt_incore_log_blocks = 1024;
60         gt->gt_logd_secs = 1;
61         gt->gt_quota_simul_sync = 64;
62         gt->gt_quota_warn_period = 10;
63         gt->gt_quota_scale_num = 1;
64         gt->gt_quota_scale_den = 1;
65         gt->gt_quota_quantum = 60;
66         gt->gt_new_files_jdata = 0;
67         gt->gt_max_readahead = 1 << 18;
68         gt->gt_stall_secs = 600;
69         gt->gt_complain_secs = 10;
70         gt->gt_statfs_quantum = 30;
71         gt->gt_statfs_slow = 0;
72 }
73
74 static struct gfs2_sbd *init_sbd(struct super_block *sb)
75 {
76         struct gfs2_sbd *sdp;
77
78         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
79         if (!sdp)
80                 return NULL;
81
82         sb->s_fs_info = sdp;
83         sdp->sd_vfs = sb;
84
85         gfs2_tune_init(&sdp->sd_tune);
86
87         mutex_init(&sdp->sd_inum_mutex);
88         spin_lock_init(&sdp->sd_statfs_spin);
89
90         spin_lock_init(&sdp->sd_rindex_spin);
91         mutex_init(&sdp->sd_rindex_mutex);
92         INIT_LIST_HEAD(&sdp->sd_rindex_list);
93         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
94
95         INIT_LIST_HEAD(&sdp->sd_jindex_list);
96         spin_lock_init(&sdp->sd_jindex_spin);
97         mutex_init(&sdp->sd_jindex_mutex);
98
99         INIT_LIST_HEAD(&sdp->sd_quota_list);
100         mutex_init(&sdp->sd_quota_mutex);
101         init_waitqueue_head(&sdp->sd_quota_wait);
102         INIT_LIST_HEAD(&sdp->sd_trunc_list);
103         spin_lock_init(&sdp->sd_trunc_lock);
104
105         spin_lock_init(&sdp->sd_log_lock);
106
107         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
108         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
109         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
110         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
111         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
112
113         mutex_init(&sdp->sd_log_reserve_mutex);
114         INIT_LIST_HEAD(&sdp->sd_ail1_list);
115         INIT_LIST_HEAD(&sdp->sd_ail2_list);
116
117         init_rwsem(&sdp->sd_log_flush_lock);
118         atomic_set(&sdp->sd_log_in_flight, 0);
119         init_waitqueue_head(&sdp->sd_log_flush_wait);
120
121         INIT_LIST_HEAD(&sdp->sd_revoke_list);
122
123         mutex_init(&sdp->sd_freeze_lock);
124
125         return sdp;
126 }
127
128
129 /**
130  * gfs2_check_sb - Check superblock
131  * @sdp: the filesystem
132  * @sb: The superblock
133  * @silent: Don't print a message if the check fails
134  *
135  * Checks the version code of the FS is one that we understand how to
136  * read and that the sizes of the various on-disk structures have not
137  * changed.
138  */
139
140 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
141 {
142         unsigned int x;
143
144         if (sb->sb_magic != GFS2_MAGIC ||
145             sb->sb_type != GFS2_METATYPE_SB) {
146                 if (!silent)
147                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
148                 return -EINVAL;
149         }
150
151         /*  If format numbers match exactly, we're done.  */
152
153         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
154             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
155                 return 0;
156
157         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
158                 for (x = 0; gfs2_old_fs_formats[x]; x++)
159                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
160                                 break;
161
162                 if (!gfs2_old_fs_formats[x]) {
163                         printk(KERN_WARNING
164                                "GFS2: code version (%u, %u) is incompatible "
165                                "with ondisk format (%u, %u)\n",
166                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
167                                sb->sb_fs_format, sb->sb_multihost_format);
168                         printk(KERN_WARNING
169                                "GFS2: I don't know how to upgrade this FS\n");
170                         return -EINVAL;
171                 }
172         }
173
174         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
175                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
176                         if (gfs2_old_multihost_formats[x] ==
177                             sb->sb_multihost_format)
178                                 break;
179
180                 if (!gfs2_old_multihost_formats[x]) {
181                         printk(KERN_WARNING
182                                "GFS2: code version (%u, %u) is incompatible "
183                                "with ondisk format (%u, %u)\n",
184                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
185                                sb->sb_fs_format, sb->sb_multihost_format);
186                         printk(KERN_WARNING
187                                "GFS2: I don't know how to upgrade this FS\n");
188                         return -EINVAL;
189                 }
190         }
191
192         if (!sdp->sd_args.ar_upgrade) {
193                 printk(KERN_WARNING
194                        "GFS2: code version (%u, %u) is incompatible "
195                        "with ondisk format (%u, %u)\n",
196                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
197                        sb->sb_fs_format, sb->sb_multihost_format);
198                 printk(KERN_INFO
199                        "GFS2: Use the \"upgrade\" mount option to upgrade "
200                        "the FS\n");
201                 printk(KERN_INFO "GFS2: See the manual for more details\n");
202                 return -EINVAL;
203         }
204
205         return 0;
206 }
207
208 static void end_bio_io_page(struct bio *bio, int error)
209 {
210         struct page *page = bio->bi_private;
211
212         if (!error)
213                 SetPageUptodate(page);
214         else
215                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
216         unlock_page(page);
217 }
218
219 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
220 {
221         const struct gfs2_sb *str = buf;
222
223         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
224         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
225         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
226         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
227         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
228         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
229         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
230         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
231         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
232         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
233         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
234
235         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
236         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
237         memcpy(sb->sb_uuid, str->sb_uuid, 16);
238 }
239
240 /**
241  * gfs2_read_super - Read the gfs2 super block from disk
242  * @sdp: The GFS2 super block
243  * @sector: The location of the super block
244  * @error: The error code to return
245  *
246  * This uses the bio functions to read the super block from disk
247  * because we want to be 100% sure that we never read cached data.
248  * A super block is read twice only during each GFS2 mount and is
249  * never written to by the filesystem. The first time its read no
250  * locks are held, and the only details which are looked at are those
251  * relating to the locking protocol. Once locking is up and working,
252  * the sb is read again under the lock to establish the location of
253  * the master directory (contains pointers to journals etc) and the
254  * root directory.
255  *
256  * Returns: 0 on success or error
257  */
258
259 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
260 {
261         struct super_block *sb = sdp->sd_vfs;
262         struct gfs2_sb *p;
263         struct page *page;
264         struct bio *bio;
265
266         page = alloc_page(GFP_NOFS);
267         if (unlikely(!page))
268                 return -ENOBUFS;
269
270         ClearPageUptodate(page);
271         ClearPageDirty(page);
272         lock_page(page);
273
274         bio = bio_alloc(GFP_NOFS, 1);
275         bio->bi_sector = sector * (sb->s_blocksize >> 9);
276         bio->bi_bdev = sb->s_bdev;
277         bio_add_page(bio, page, PAGE_SIZE, 0);
278
279         bio->bi_end_io = end_bio_io_page;
280         bio->bi_private = page;
281         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
282         wait_on_page_locked(page);
283         bio_put(bio);
284         if (!PageUptodate(page)) {
285                 __free_page(page);
286                 return -EIO;
287         }
288         p = kmap(page);
289         gfs2_sb_in(&sdp->sd_sb, p);
290         kunmap(page);
291         __free_page(page);
292         return 0;
293 }
294
295 /**
296  * gfs2_read_sb - Read super block
297  * @sdp: The GFS2 superblock
298  * @silent: Don't print message if mount fails
299  *
300  */
301
302 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
303 {
304         u32 hash_blocks, ind_blocks, leaf_blocks;
305         u32 tmp_blocks;
306         unsigned int x;
307         int error;
308
309         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
310         if (error) {
311                 if (!silent)
312                         fs_err(sdp, "can't read superblock\n");
313                 return error;
314         }
315
316         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
317         if (error)
318                 return error;
319
320         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
321                                GFS2_BASIC_BLOCK_SHIFT;
322         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
323         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
324                           sizeof(struct gfs2_dinode)) / sizeof(u64);
325         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
326                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
327         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
328         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
329         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
330         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
331         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
332                                 sizeof(struct gfs2_meta_header)) /
333                                 sizeof(struct gfs2_quota_change);
334
335         /* Compute maximum reservation required to add a entry to a directory */
336
337         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
338                              sdp->sd_jbsize);
339
340         ind_blocks = 0;
341         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
342                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
343                 ind_blocks += tmp_blocks;
344         }
345
346         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
347
348         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
349
350         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
351                                 sizeof(struct gfs2_dinode);
352         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
353         for (x = 2;; x++) {
354                 u64 space, d;
355                 u32 m;
356
357                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
358                 d = space;
359                 m = do_div(d, sdp->sd_inptrs);
360
361                 if (d != sdp->sd_heightsize[x - 1] || m)
362                         break;
363                 sdp->sd_heightsize[x] = space;
364         }
365         sdp->sd_max_height = x;
366         sdp->sd_heightsize[x] = ~0;
367         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
368
369         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
370                                  sizeof(struct gfs2_dinode);
371         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
372         for (x = 2;; x++) {
373                 u64 space, d;
374                 u32 m;
375
376                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
377                 d = space;
378                 m = do_div(d, sdp->sd_inptrs);
379
380                 if (d != sdp->sd_jheightsize[x - 1] || m)
381                         break;
382                 sdp->sd_jheightsize[x] = space;
383         }
384         sdp->sd_max_jheight = x;
385         sdp->sd_jheightsize[x] = ~0;
386         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
387
388         return 0;
389 }
390
391 static int init_names(struct gfs2_sbd *sdp, int silent)
392 {
393         char *proto, *table;
394         int error = 0;
395
396         proto = sdp->sd_args.ar_lockproto;
397         table = sdp->sd_args.ar_locktable;
398
399         /*  Try to autodetect  */
400
401         if (!proto[0] || !table[0]) {
402                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
403                 if (error)
404                         return error;
405
406                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
407                 if (error)
408                         goto out;
409
410                 if (!proto[0])
411                         proto = sdp->sd_sb.sb_lockproto;
412                 if (!table[0])
413                         table = sdp->sd_sb.sb_locktable;
414         }
415
416         if (!table[0])
417                 table = sdp->sd_vfs->s_id;
418
419         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
420         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
421
422         table = sdp->sd_table_name;
423         while ((table = strchr(table, '/')))
424                 *table = '_';
425
426 out:
427         return error;
428 }
429
430 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
431                         int undo)
432 {
433         int error = 0;
434
435         if (undo)
436                 goto fail_trans;
437
438         error = gfs2_glock_nq_num(sdp,
439                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
440                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
441                                   mount_gh);
442         if (error) {
443                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
444                 goto fail;
445         }
446
447         error = gfs2_glock_nq_num(sdp,
448                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
449                                   LM_ST_SHARED,
450                                   LM_FLAG_NOEXP | GL_EXACT,
451                                   &sdp->sd_live_gh);
452         if (error) {
453                 fs_err(sdp, "can't acquire live glock: %d\n", error);
454                 goto fail_mount;
455         }
456
457         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
458                                CREATE, &sdp->sd_rename_gl);
459         if (error) {
460                 fs_err(sdp, "can't create rename glock: %d\n", error);
461                 goto fail_live;
462         }
463
464         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
465                                CREATE, &sdp->sd_trans_gl);
466         if (error) {
467                 fs_err(sdp, "can't create transaction glock: %d\n", error);
468                 goto fail_rename;
469         }
470
471         return 0;
472
473 fail_trans:
474         gfs2_glock_put(sdp->sd_trans_gl);
475 fail_rename:
476         gfs2_glock_put(sdp->sd_rename_gl);
477 fail_live:
478         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
479 fail_mount:
480         gfs2_glock_dq_uninit(mount_gh);
481 fail:
482         return error;
483 }
484
485 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
486                             u64 no_addr, const char *name)
487 {
488         struct gfs2_sbd *sdp = sb->s_fs_info;
489         struct dentry *dentry;
490         struct inode *inode;
491
492         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
493         if (IS_ERR(inode)) {
494                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
495                 return PTR_ERR(inode);
496         }
497         dentry = d_alloc_root(inode);
498         if (!dentry) {
499                 fs_err(sdp, "can't alloc %s dentry\n", name);
500                 iput(inode);
501                 return -ENOMEM;
502         }
503         dentry->d_op = &gfs2_dops;
504         *dptr = dentry;
505         return 0;
506 }
507
508 static int init_sb(struct gfs2_sbd *sdp, int silent)
509 {
510         struct super_block *sb = sdp->sd_vfs;
511         struct gfs2_holder sb_gh;
512         u64 no_addr;
513         int ret;
514
515         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
516                                 LM_ST_SHARED, 0, &sb_gh);
517         if (ret) {
518                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
519                 return ret;
520         }
521
522         ret = gfs2_read_sb(sdp, silent);
523         if (ret) {
524                 fs_err(sdp, "can't read superblock: %d\n", ret);
525                 goto out;
526         }
527
528         /* Set up the buffer cache and SB for real */
529         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
530                 ret = -EINVAL;
531                 fs_err(sdp, "FS block size (%u) is too small for device "
532                        "block size (%u)\n",
533                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
534                 goto out;
535         }
536         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
537                 ret = -EINVAL;
538                 fs_err(sdp, "FS block size (%u) is too big for machine "
539                        "page size (%u)\n",
540                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
541                 goto out;
542         }
543         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
544
545         /* Get the root inode */
546         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
547         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
548         if (ret)
549                 goto out;
550
551         /* Get the master inode */
552         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
553         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
554         if (ret) {
555                 dput(sdp->sd_root_dir);
556                 goto out;
557         }
558         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
559 out:
560         gfs2_glock_dq_uninit(&sb_gh);
561         return ret;
562 }
563
564 /**
565  * map_journal_extents - create a reusable "extent" mapping from all logical
566  * blocks to all physical blocks for the given journal.  This will save
567  * us time when writing journal blocks.  Most journals will have only one
568  * extent that maps all their logical blocks.  That's because gfs2.mkfs
569  * arranges the journal blocks sequentially to maximize performance.
570  * So the extent would map the first block for the entire file length.
571  * However, gfs2_jadd can happen while file activity is happening, so
572  * those journals may not be sequential.  Less likely is the case where
573  * the users created their own journals by mounting the metafs and
574  * laying it out.  But it's still possible.  These journals might have
575  * several extents.
576  *
577  * TODO: This should be done in bigger chunks rather than one block at a time,
578  *       but since it's only done at mount time, I'm not worried about the
579  *       time it takes.
580  */
581 static int map_journal_extents(struct gfs2_sbd *sdp)
582 {
583         struct gfs2_jdesc *jd = sdp->sd_jdesc;
584         unsigned int lb;
585         u64 db, prev_db; /* logical block, disk block, prev disk block */
586         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
587         struct gfs2_journal_extent *jext = NULL;
588         struct buffer_head bh;
589         int rc = 0;
590
591         prev_db = 0;
592
593         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
594                 bh.b_state = 0;
595                 bh.b_blocknr = 0;
596                 bh.b_size = 1 << ip->i_inode.i_blkbits;
597                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
598                 db = bh.b_blocknr;
599                 if (rc || !db) {
600                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
601                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
602                         break;
603                 }
604                 if (!prev_db || db != prev_db + 1) {
605                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
606                                        GFP_KERNEL);
607                         if (!jext) {
608                                 printk(KERN_INFO "GFS2 error: out of memory "
609                                        "mapping journal extents.\n");
610                                 rc = -ENOMEM;
611                                 break;
612                         }
613                         jext->dblock = db;
614                         jext->lblock = lb;
615                         jext->blocks = 1;
616                         list_add_tail(&jext->extent_list, &jd->extent_list);
617                 } else {
618                         jext->blocks++;
619                 }
620                 prev_db = db;
621         }
622         return rc;
623 }
624
625 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
626 {
627         char *message = "FIRSTMOUNT=Done";
628         char *envp[] = { message, NULL };
629         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
630         ls->ls_first_done = 1;
631         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
632 }
633
634 /**
635  * gfs2_jindex_hold - Grab a lock on the jindex
636  * @sdp: The GFS2 superblock
637  * @ji_gh: the holder for the jindex glock
638  *
639  * Returns: errno
640  */
641
642 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
643 {
644         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
645         struct qstr name;
646         char buf[20];
647         struct gfs2_jdesc *jd;
648         int error;
649
650         name.name = buf;
651
652         mutex_lock(&sdp->sd_jindex_mutex);
653
654         for (;;) {
655                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
656                 if (error)
657                         break;
658
659                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
660                 name.hash = gfs2_disk_hash(name.name, name.len);
661
662                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
663                 if (error == -ENOENT) {
664                         error = 0;
665                         break;
666                 }
667
668                 gfs2_glock_dq_uninit(ji_gh);
669
670                 if (error)
671                         break;
672
673                 error = -ENOMEM;
674                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
675                 if (!jd)
676                         break;
677
678                 INIT_LIST_HEAD(&jd->extent_list);
679                 slow_work_init(&jd->jd_work, &gfs2_recover_ops);
680                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
681                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
682                         if (!jd->jd_inode)
683                                 error = -ENOENT;
684                         else
685                                 error = PTR_ERR(jd->jd_inode);
686                         kfree(jd);
687                         break;
688                 }
689
690                 spin_lock(&sdp->sd_jindex_spin);
691                 jd->jd_jid = sdp->sd_journals++;
692                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
693                 spin_unlock(&sdp->sd_jindex_spin);
694         }
695
696         mutex_unlock(&sdp->sd_jindex_mutex);
697
698         return error;
699 }
700
701 static int init_journal(struct gfs2_sbd *sdp, int undo)
702 {
703         struct inode *master = sdp->sd_master_dir->d_inode;
704         struct gfs2_holder ji_gh;
705         struct gfs2_inode *ip;
706         int jindex = 1;
707         int error = 0;
708
709         if (undo) {
710                 jindex = 0;
711                 goto fail_jinode_gh;
712         }
713
714         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
715         if (IS_ERR(sdp->sd_jindex)) {
716                 fs_err(sdp, "can't lookup journal index: %d\n", error);
717                 return PTR_ERR(sdp->sd_jindex);
718         }
719         ip = GFS2_I(sdp->sd_jindex);
720
721         /* Load in the journal index special file */
722
723         error = gfs2_jindex_hold(sdp, &ji_gh);
724         if (error) {
725                 fs_err(sdp, "can't read journal index: %d\n", error);
726                 goto fail;
727         }
728
729         error = -EINVAL;
730         if (!gfs2_jindex_size(sdp)) {
731                 fs_err(sdp, "no journals!\n");
732                 goto fail_jindex;
733         }
734
735         if (sdp->sd_args.ar_spectator) {
736                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
737                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
738         } else {
739                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
740                         fs_err(sdp, "can't mount journal #%u\n",
741                                sdp->sd_lockstruct.ls_jid);
742                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
743                                gfs2_jindex_size(sdp),
744                                gfs2_jindex_size(sdp) - 1);
745                         goto fail_jindex;
746                 }
747                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
748
749                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
750                                           &gfs2_journal_glops,
751                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
752                                           &sdp->sd_journal_gh);
753                 if (error) {
754                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
755                         goto fail_jindex;
756                 }
757
758                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
759                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
760                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
761                                            &sdp->sd_jinode_gh);
762                 if (error) {
763                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
764                                error);
765                         goto fail_journal_gh;
766                 }
767
768                 error = gfs2_jdesc_check(sdp->sd_jdesc);
769                 if (error) {
770                         fs_err(sdp, "my journal (%u) is bad: %d\n",
771                                sdp->sd_jdesc->jd_jid, error);
772                         goto fail_jinode_gh;
773                 }
774                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
775
776                 /* Map the extents for this journal's blocks */
777                 map_journal_extents(sdp);
778         }
779         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
780
781         if (sdp->sd_lockstruct.ls_first) {
782                 unsigned int x;
783                 for (x = 0; x < sdp->sd_journals; x++) {
784                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
785                         if (error) {
786                                 fs_err(sdp, "error recovering journal %u: %d\n",
787                                        x, error);
788                                 goto fail_jinode_gh;
789                         }
790                 }
791
792                 gfs2_others_may_mount(sdp);
793         } else if (!sdp->sd_args.ar_spectator) {
794                 error = gfs2_recover_journal(sdp->sd_jdesc);
795                 if (error) {
796                         fs_err(sdp, "error recovering my journal: %d\n", error);
797                         goto fail_jinode_gh;
798                 }
799         }
800
801         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
802         gfs2_glock_dq_uninit(&ji_gh);
803         jindex = 0;
804
805         return 0;
806
807 fail_jinode_gh:
808         if (!sdp->sd_args.ar_spectator)
809                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
810 fail_journal_gh:
811         if (!sdp->sd_args.ar_spectator)
812                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
813 fail_jindex:
814         gfs2_jindex_free(sdp);
815         if (jindex)
816                 gfs2_glock_dq_uninit(&ji_gh);
817 fail:
818         iput(sdp->sd_jindex);
819         return error;
820 }
821
822
823 static int init_inodes(struct gfs2_sbd *sdp, int undo)
824 {
825         int error = 0;
826         struct gfs2_inode *ip;
827         struct inode *master = sdp->sd_master_dir->d_inode;
828
829         if (undo)
830                 goto fail_qinode;
831
832         error = init_journal(sdp, undo);
833         if (error)
834                 goto fail;
835
836         /* Read in the master inode number inode */
837         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
838         if (IS_ERR(sdp->sd_inum_inode)) {
839                 error = PTR_ERR(sdp->sd_inum_inode);
840                 fs_err(sdp, "can't read in inum inode: %d\n", error);
841                 goto fail_journal;
842         }
843
844
845         /* Read in the master statfs inode */
846         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
847         if (IS_ERR(sdp->sd_statfs_inode)) {
848                 error = PTR_ERR(sdp->sd_statfs_inode);
849                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
850                 goto fail_inum;
851         }
852
853         /* Read in the resource index inode */
854         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
855         if (IS_ERR(sdp->sd_rindex)) {
856                 error = PTR_ERR(sdp->sd_rindex);
857                 fs_err(sdp, "can't get resource index inode: %d\n", error);
858                 goto fail_statfs;
859         }
860         ip = GFS2_I(sdp->sd_rindex);
861         sdp->sd_rindex_uptodate = 0;
862
863         /* Read in the quota inode */
864         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
865         if (IS_ERR(sdp->sd_quota_inode)) {
866                 error = PTR_ERR(sdp->sd_quota_inode);
867                 fs_err(sdp, "can't get quota file inode: %d\n", error);
868                 goto fail_rindex;
869         }
870         return 0;
871
872 fail_qinode:
873         iput(sdp->sd_quota_inode);
874 fail_rindex:
875         gfs2_clear_rgrpd(sdp);
876         iput(sdp->sd_rindex);
877 fail_statfs:
878         iput(sdp->sd_statfs_inode);
879 fail_inum:
880         iput(sdp->sd_inum_inode);
881 fail_journal:
882         init_journal(sdp, UNDO);
883 fail:
884         return error;
885 }
886
887 static int init_per_node(struct gfs2_sbd *sdp, int undo)
888 {
889         struct inode *pn = NULL;
890         char buf[30];
891         int error = 0;
892         struct gfs2_inode *ip;
893         struct inode *master = sdp->sd_master_dir->d_inode;
894
895         if (sdp->sd_args.ar_spectator)
896                 return 0;
897
898         if (undo)
899                 goto fail_qc_gh;
900
901         pn = gfs2_lookup_simple(master, "per_node");
902         if (IS_ERR(pn)) {
903                 error = PTR_ERR(pn);
904                 fs_err(sdp, "can't find per_node directory: %d\n", error);
905                 return error;
906         }
907
908         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
909         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
910         if (IS_ERR(sdp->sd_ir_inode)) {
911                 error = PTR_ERR(sdp->sd_ir_inode);
912                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
913                 goto fail;
914         }
915
916         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
917         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
918         if (IS_ERR(sdp->sd_sc_inode)) {
919                 error = PTR_ERR(sdp->sd_sc_inode);
920                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
921                 goto fail_ir_i;
922         }
923
924         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
925         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
926         if (IS_ERR(sdp->sd_qc_inode)) {
927                 error = PTR_ERR(sdp->sd_qc_inode);
928                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
929                 goto fail_ut_i;
930         }
931
932         iput(pn);
933         pn = NULL;
934
935         ip = GFS2_I(sdp->sd_ir_inode);
936         error = gfs2_glock_nq_init(ip->i_gl,
937                                    LM_ST_EXCLUSIVE, 0,
938                                    &sdp->sd_ir_gh);
939         if (error) {
940                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
941                 goto fail_qc_i;
942         }
943
944         ip = GFS2_I(sdp->sd_sc_inode);
945         error = gfs2_glock_nq_init(ip->i_gl,
946                                    LM_ST_EXCLUSIVE, 0,
947                                    &sdp->sd_sc_gh);
948         if (error) {
949                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
950                 goto fail_ir_gh;
951         }
952
953         ip = GFS2_I(sdp->sd_qc_inode);
954         error = gfs2_glock_nq_init(ip->i_gl,
955                                    LM_ST_EXCLUSIVE, 0,
956                                    &sdp->sd_qc_gh);
957         if (error) {
958                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
959                 goto fail_ut_gh;
960         }
961
962         return 0;
963
964 fail_qc_gh:
965         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
966 fail_ut_gh:
967         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
968 fail_ir_gh:
969         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
970 fail_qc_i:
971         iput(sdp->sd_qc_inode);
972 fail_ut_i:
973         iput(sdp->sd_sc_inode);
974 fail_ir_i:
975         iput(sdp->sd_ir_inode);
976 fail:
977         if (pn)
978                 iput(pn);
979         return error;
980 }
981
982 static int init_threads(struct gfs2_sbd *sdp, int undo)
983 {
984         struct task_struct *p;
985         int error = 0;
986
987         if (undo)
988                 goto fail_quotad;
989
990         sdp->sd_log_flush_time = jiffies;
991
992         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
993         error = IS_ERR(p);
994         if (error) {
995                 fs_err(sdp, "can't start logd thread: %d\n", error);
996                 return error;
997         }
998         sdp->sd_logd_process = p;
999
1000         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1001         error = IS_ERR(p);
1002         if (error) {
1003                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1004                 goto fail;
1005         }
1006         sdp->sd_quotad_process = p;
1007
1008         return 0;
1009
1010
1011 fail_quotad:
1012         kthread_stop(sdp->sd_quotad_process);
1013 fail:
1014         kthread_stop(sdp->sd_logd_process);
1015         return error;
1016 }
1017
1018 static const match_table_t nolock_tokens = {
1019         { Opt_jid, "jid=%d\n", },
1020         { Opt_err, NULL },
1021 };
1022
1023 static const struct lm_lockops nolock_ops = {
1024         .lm_proto_name = "lock_nolock",
1025         .lm_put_lock = kmem_cache_free,
1026         .lm_tokens = &nolock_tokens,
1027 };
1028
1029 /**
1030  * gfs2_lm_mount - mount a locking protocol
1031  * @sdp: the filesystem
1032  * @args: mount arguements
1033  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1034  *
1035  * Returns: errno
1036  */
1037
1038 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1039 {
1040         const struct lm_lockops *lm;
1041         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1042         struct gfs2_args *args = &sdp->sd_args;
1043         const char *proto = sdp->sd_proto_name;
1044         const char *table = sdp->sd_table_name;
1045         const char *fsname;
1046         char *o, *options;
1047         int ret;
1048
1049         if (!strcmp("lock_nolock", proto)) {
1050                 lm = &nolock_ops;
1051                 sdp->sd_args.ar_localflocks = 1;
1052                 sdp->sd_args.ar_localcaching = 1;
1053 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1054         } else if (!strcmp("lock_dlm", proto)) {
1055                 lm = &gfs2_dlm_ops;
1056 #endif
1057         } else {
1058                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1059                 return -ENOENT;
1060         }
1061
1062         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1063
1064         ls->ls_ops = lm;
1065         ls->ls_first = 1;
1066         ls->ls_id = 0;
1067
1068         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1069                 substring_t tmp[MAX_OPT_ARGS];
1070                 int token, option;
1071
1072                 if (!o || !*o)
1073                         continue;
1074
1075                 token = match_token(o, *lm->lm_tokens, tmp);
1076                 switch (token) {
1077                 case Opt_jid:
1078                         ret = match_int(&tmp[0], &option);
1079                         if (ret || option < 0) 
1080                                 goto hostdata_error;
1081                         ls->ls_jid = option;
1082                         break;
1083                 case Opt_id:
1084                         ret = match_int(&tmp[0], &option);
1085                         if (ret)
1086                                 goto hostdata_error;
1087                         ls->ls_id = option;
1088                         break;
1089                 case Opt_first:
1090                         ret = match_int(&tmp[0], &option);
1091                         if (ret || (option != 0 && option != 1))
1092                                 goto hostdata_error;
1093                         ls->ls_first = option;
1094                         break;
1095                 case Opt_nodir:
1096                         ret = match_int(&tmp[0], &option);
1097                         if (ret || (option != 0 && option != 1))
1098                                 goto hostdata_error;
1099                         ls->ls_nodir = option;
1100                         break;
1101                 case Opt_err:
1102                 default:
1103 hostdata_error:
1104                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1105                         return -EINVAL;
1106                 }
1107         }
1108
1109         if (sdp->sd_args.ar_spectator)
1110                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1111         else
1112                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1113                          sdp->sd_lockstruct.ls_jid);
1114
1115         fsname = strchr(table, ':');
1116         if (fsname)
1117                 fsname++;
1118         if (lm->lm_mount == NULL) {
1119                 fs_info(sdp, "Now mounting FS...\n");
1120                 return 0;
1121         }
1122         ret = lm->lm_mount(sdp, fsname);
1123         if (ret == 0)
1124                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1125         return ret;
1126 }
1127
1128 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1129 {
1130         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1131         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1132             lm->lm_unmount)
1133                 lm->lm_unmount(sdp);
1134 }
1135
1136 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1137 {
1138         struct super_block *sb = sdp->sd_vfs;
1139         char ro[20];
1140         char spectator[20];
1141         char *envp[] = { ro, spectator, NULL };
1142         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1143         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1144         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1145 }
1146
1147 /**
1148  * fill_super - Read in superblock
1149  * @sb: The VFS superblock
1150  * @data: Mount options
1151  * @silent: Don't complain if it's not a GFS2 filesystem
1152  *
1153  * Returns: errno
1154  */
1155
1156 static int fill_super(struct super_block *sb, void *data, int silent)
1157 {
1158         struct gfs2_sbd *sdp;
1159         struct gfs2_holder mount_gh;
1160         int error;
1161
1162         sdp = init_sbd(sb);
1163         if (!sdp) {
1164                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1165                 return -ENOMEM;
1166         }
1167
1168         sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
1169         sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
1170         sdp->sd_args.ar_commit = 60;
1171
1172         error = gfs2_mount_args(sdp, &sdp->sd_args, data);
1173         if (error) {
1174                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1175                 goto fail;
1176         }
1177
1178         if (sdp->sd_args.ar_spectator) {
1179                 sb->s_flags |= MS_RDONLY;
1180                 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
1181         }
1182         if (sdp->sd_args.ar_posix_acl)
1183                 sb->s_flags |= MS_POSIXACL;
1184
1185         sb->s_magic = GFS2_MAGIC;
1186         sb->s_op = &gfs2_super_ops;
1187         sb->s_export_op = &gfs2_export_ops;
1188         sb->s_time_gran = 1;
1189         sb->s_maxbytes = MAX_LFS_FILESIZE;
1190
1191         /* Set up the buffer cache and fill in some fake block size values
1192            to allow us to read-in the on-disk superblock. */
1193         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1194         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1195         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1196                                GFS2_BASIC_BLOCK_SHIFT;
1197         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1198
1199         sdp->sd_tune.gt_log_flush_secs = sdp->sd_args.ar_commit;
1200
1201         error = init_names(sdp, silent);
1202         if (error)
1203                 goto fail;
1204
1205         gfs2_create_debugfs_file(sdp);
1206
1207         error = gfs2_sys_fs_add(sdp);
1208         if (error)
1209                 goto fail;
1210
1211         error = gfs2_lm_mount(sdp, silent);
1212         if (error)
1213                 goto fail_sys;
1214
1215         error = init_locking(sdp, &mount_gh, DO);
1216         if (error)
1217                 goto fail_lm;
1218
1219         error = init_sb(sdp, silent);
1220         if (error)
1221                 goto fail_locking;
1222
1223         error = init_inodes(sdp, DO);
1224         if (error)
1225                 goto fail_sb;
1226
1227         error = init_per_node(sdp, DO);
1228         if (error)
1229                 goto fail_inodes;
1230
1231         error = gfs2_statfs_init(sdp);
1232         if (error) {
1233                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1234                 goto fail_per_node;
1235         }
1236
1237         error = init_threads(sdp, DO);
1238         if (error)
1239                 goto fail_per_node;
1240
1241         if (!(sb->s_flags & MS_RDONLY)) {
1242                 error = gfs2_make_fs_rw(sdp);
1243                 if (error) {
1244                         fs_err(sdp, "can't make FS RW: %d\n", error);
1245                         goto fail_threads;
1246                 }
1247         }
1248
1249         gfs2_glock_dq_uninit(&mount_gh);
1250         gfs2_online_uevent(sdp);
1251         return 0;
1252
1253 fail_threads:
1254         init_threads(sdp, UNDO);
1255 fail_per_node:
1256         init_per_node(sdp, UNDO);
1257 fail_inodes:
1258         init_inodes(sdp, UNDO);
1259 fail_sb:
1260         if (sdp->sd_root_dir)
1261                 dput(sdp->sd_root_dir);
1262         if (sdp->sd_master_dir)
1263                 dput(sdp->sd_master_dir);
1264         if (sb->s_root)
1265                 dput(sb->s_root);
1266         sb->s_root = NULL;
1267 fail_locking:
1268         init_locking(sdp, &mount_gh, UNDO);
1269 fail_lm:
1270         gfs2_gl_hash_clear(sdp);
1271         gfs2_lm_unmount(sdp);
1272         while (invalidate_inodes(sb))
1273                 yield();
1274 fail_sys:
1275         gfs2_sys_fs_del(sdp);
1276 fail:
1277         gfs2_delete_debugfs_file(sdp);
1278         kfree(sdp);
1279         sb->s_fs_info = NULL;
1280         return error;
1281 }
1282
1283 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1284                        const char *dev_name, void *data, struct vfsmount *mnt)
1285 {
1286         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1287 }
1288
1289 static int test_meta_super(struct super_block *s, void *ptr)
1290 {
1291         struct block_device *bdev = ptr;
1292         return (bdev == s->s_bdev);
1293 }
1294
1295 static int set_meta_super(struct super_block *s, void *ptr)
1296 {
1297         return -EINVAL;
1298 }
1299
1300 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1301                             const char *dev_name, void *data, struct vfsmount *mnt)
1302 {
1303         struct super_block *s;
1304         struct gfs2_sbd *sdp;
1305         struct path path;
1306         int error;
1307
1308         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1309         if (error) {
1310                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1311                        dev_name, error);
1312                 return error;
1313         }
1314         s = sget(&gfs2_fs_type, test_meta_super, set_meta_super,
1315                  path.dentry->d_inode->i_sb->s_bdev);
1316         path_put(&path);
1317         if (IS_ERR(s)) {
1318                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1319                 return PTR_ERR(s);
1320         }
1321         sdp = s->s_fs_info;
1322         mnt->mnt_sb = s;
1323         mnt->mnt_root = dget(sdp->sd_master_dir);
1324         return 0;
1325 }
1326
1327 static void gfs2_kill_sb(struct super_block *sb)
1328 {
1329         struct gfs2_sbd *sdp = sb->s_fs_info;
1330
1331         if (sdp == NULL) {
1332                 kill_block_super(sb);
1333                 return;
1334         }
1335
1336         gfs2_meta_syncfs(sdp);
1337         dput(sdp->sd_root_dir);
1338         dput(sdp->sd_master_dir);
1339         sdp->sd_root_dir = NULL;
1340         sdp->sd_master_dir = NULL;
1341         shrink_dcache_sb(sb);
1342         kill_block_super(sb);
1343         gfs2_delete_debugfs_file(sdp);
1344         kfree(sdp);
1345 }
1346
1347 struct file_system_type gfs2_fs_type = {
1348         .name = "gfs2",
1349         .fs_flags = FS_REQUIRES_DEV,
1350         .get_sb = gfs2_get_sb,
1351         .kill_sb = gfs2_kill_sb,
1352         .owner = THIS_MODULE,
1353 };
1354
1355 struct file_system_type gfs2meta_fs_type = {
1356         .name = "gfs2meta",
1357         .fs_flags = FS_REQUIRES_DEV,
1358         .get_sb = gfs2_get_sb_meta,
1359         .owner = THIS_MODULE,
1360 };
1361