GFS2: Fix error path ref counting for root inode
[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
21 #include "gfs2.h"
22 #include "incore.h"
23 #include "bmap.h"
24 #include "glock.h"
25 #include "glops.h"
26 #include "inode.h"
27 #include "recovery.h"
28 #include "rgrp.h"
29 #include "super.h"
30 #include "sys.h"
31 #include "util.h"
32 #include "log.h"
33 #include "quota.h"
34 #include "dir.h"
35
36 #define DO 0
37 #define UNDO 1
38
39 static const u32 gfs2_old_fs_formats[] = {
40         0
41 };
42
43 static const u32 gfs2_old_multihost_formats[] = {
44         0
45 };
46
47 /**
48  * gfs2_tune_init - Fill a gfs2_tune structure with default values
49  * @gt: tune
50  *
51  */
52
53 static void gfs2_tune_init(struct gfs2_tune *gt)
54 {
55         spin_lock_init(&gt->gt_spin);
56
57         gt->gt_incore_log_blocks = 1024;
58         gt->gt_log_flush_secs = 60;
59         gt->gt_recoverd_secs = 60;
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 }
238
239 /**
240  * gfs2_read_super - Read the gfs2 super block from disk
241  * @sdp: The GFS2 super block
242  * @sector: The location of the super block
243  * @error: The error code to return
244  *
245  * This uses the bio functions to read the super block from disk
246  * because we want to be 100% sure that we never read cached data.
247  * A super block is read twice only during each GFS2 mount and is
248  * never written to by the filesystem. The first time its read no
249  * locks are held, and the only details which are looked at are those
250  * relating to the locking protocol. Once locking is up and working,
251  * the sb is read again under the lock to establish the location of
252  * the master directory (contains pointers to journals etc) and the
253  * root directory.
254  *
255  * Returns: 0 on success or error
256  */
257
258 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
259 {
260         struct super_block *sb = sdp->sd_vfs;
261         struct gfs2_sb *p;
262         struct page *page;
263         struct bio *bio;
264
265         page = alloc_page(GFP_NOFS);
266         if (unlikely(!page))
267                 return -ENOBUFS;
268
269         ClearPageUptodate(page);
270         ClearPageDirty(page);
271         lock_page(page);
272
273         bio = bio_alloc(GFP_NOFS, 1);
274         if (unlikely(!bio)) {
275                 __free_page(page);
276                 return -ENOBUFS;
277         }
278
279         bio->bi_sector = sector * (sb->s_blocksize >> 9);
280         bio->bi_bdev = sb->s_bdev;
281         bio_add_page(bio, page, PAGE_SIZE, 0);
282
283         bio->bi_end_io = end_bio_io_page;
284         bio->bi_private = page;
285         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
286         wait_on_page_locked(page);
287         bio_put(bio);
288         if (!PageUptodate(page)) {
289                 __free_page(page);
290                 return -EIO;
291         }
292         p = kmap(page);
293         gfs2_sb_in(&sdp->sd_sb, p);
294         kunmap(page);
295         __free_page(page);
296         return 0;
297 }
298 /**
299  * gfs2_read_sb - Read super block
300  * @sdp: The GFS2 superblock
301  * @gl: the glock for the superblock (assumed to be held)
302  * @silent: Don't print message if mount fails
303  *
304  */
305
306 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
307 {
308         u32 hash_blocks, ind_blocks, leaf_blocks;
309         u32 tmp_blocks;
310         unsigned int x;
311         int error;
312
313         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
314         if (error) {
315                 if (!silent)
316                         fs_err(sdp, "can't read superblock\n");
317                 return error;
318         }
319
320         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
321         if (error)
322                 return error;
323
324         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
325                                GFS2_BASIC_BLOCK_SHIFT;
326         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
327         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
328                           sizeof(struct gfs2_dinode)) / sizeof(u64);
329         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
330                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
331         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
332         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
333         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
334         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
335         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
336                                 sizeof(struct gfs2_meta_header)) /
337                                 sizeof(struct gfs2_quota_change);
338
339         /* Compute maximum reservation required to add a entry to a directory */
340
341         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
342                              sdp->sd_jbsize);
343
344         ind_blocks = 0;
345         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
346                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
347                 ind_blocks += tmp_blocks;
348         }
349
350         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
351
352         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
353
354         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
355                                 sizeof(struct gfs2_dinode);
356         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
357         for (x = 2;; x++) {
358                 u64 space, d;
359                 u32 m;
360
361                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
362                 d = space;
363                 m = do_div(d, sdp->sd_inptrs);
364
365                 if (d != sdp->sd_heightsize[x - 1] || m)
366                         break;
367                 sdp->sd_heightsize[x] = space;
368         }
369         sdp->sd_max_height = x;
370         sdp->sd_heightsize[x] = ~0;
371         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
372
373         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
374                                  sizeof(struct gfs2_dinode);
375         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
376         for (x = 2;; x++) {
377                 u64 space, d;
378                 u32 m;
379
380                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
381                 d = space;
382                 m = do_div(d, sdp->sd_inptrs);
383
384                 if (d != sdp->sd_jheightsize[x - 1] || m)
385                         break;
386                 sdp->sd_jheightsize[x] = space;
387         }
388         sdp->sd_max_jheight = x;
389         sdp->sd_jheightsize[x] = ~0;
390         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
391
392         return 0;
393 }
394
395 static int init_names(struct gfs2_sbd *sdp, int silent)
396 {
397         char *proto, *table;
398         int error = 0;
399
400         proto = sdp->sd_args.ar_lockproto;
401         table = sdp->sd_args.ar_locktable;
402
403         /*  Try to autodetect  */
404
405         if (!proto[0] || !table[0]) {
406                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
407                 if (error)
408                         return error;
409
410                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
411                 if (error)
412                         goto out;
413
414                 if (!proto[0])
415                         proto = sdp->sd_sb.sb_lockproto;
416                 if (!table[0])
417                         table = sdp->sd_sb.sb_locktable;
418         }
419
420         if (!table[0])
421                 table = sdp->sd_vfs->s_id;
422
423         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
424         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
425
426         table = sdp->sd_table_name;
427         while ((table = strchr(table, '/')))
428                 *table = '_';
429
430 out:
431         return error;
432 }
433
434 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
435                         int undo)
436 {
437         int error = 0;
438
439         if (undo)
440                 goto fail_trans;
441
442         error = gfs2_glock_nq_num(sdp,
443                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
444                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
445                                   mount_gh);
446         if (error) {
447                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
448                 goto fail;
449         }
450
451         error = gfs2_glock_nq_num(sdp,
452                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
453                                   LM_ST_SHARED,
454                                   LM_FLAG_NOEXP | GL_EXACT,
455                                   &sdp->sd_live_gh);
456         if (error) {
457                 fs_err(sdp, "can't acquire live glock: %d\n", error);
458                 goto fail_mount;
459         }
460
461         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
462                                CREATE, &sdp->sd_rename_gl);
463         if (error) {
464                 fs_err(sdp, "can't create rename glock: %d\n", error);
465                 goto fail_live;
466         }
467
468         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
469                                CREATE, &sdp->sd_trans_gl);
470         if (error) {
471                 fs_err(sdp, "can't create transaction glock: %d\n", error);
472                 goto fail_rename;
473         }
474
475         return 0;
476
477 fail_trans:
478         gfs2_glock_put(sdp->sd_trans_gl);
479 fail_rename:
480         gfs2_glock_put(sdp->sd_rename_gl);
481 fail_live:
482         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
483 fail_mount:
484         gfs2_glock_dq_uninit(mount_gh);
485 fail:
486         return error;
487 }
488
489 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
490                             u64 no_addr, const char *name)
491 {
492         struct gfs2_sbd *sdp = sb->s_fs_info;
493         struct dentry *dentry;
494         struct inode *inode;
495
496         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
497         if (IS_ERR(inode)) {
498                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
499                 return PTR_ERR(inode);
500         }
501         dentry = d_alloc_root(inode);
502         if (!dentry) {
503                 fs_err(sdp, "can't alloc %s dentry\n", name);
504                 iput(inode);
505                 return -ENOMEM;
506         }
507         dentry->d_op = &gfs2_dops;
508         *dptr = dentry;
509         return 0;
510 }
511
512 static int init_sb(struct gfs2_sbd *sdp, int silent)
513 {
514         struct super_block *sb = sdp->sd_vfs;
515         struct gfs2_holder sb_gh;
516         u64 no_addr;
517         int ret;
518
519         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
520                                 LM_ST_SHARED, 0, &sb_gh);
521         if (ret) {
522                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
523                 return ret;
524         }
525
526         ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
527         if (ret) {
528                 fs_err(sdp, "can't read superblock: %d\n", ret);
529                 goto out;
530         }
531
532         /* Set up the buffer cache and SB for real */
533         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
534                 ret = -EINVAL;
535                 fs_err(sdp, "FS block size (%u) is too small for device "
536                        "block size (%u)\n",
537                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
538                 goto out;
539         }
540         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
541                 ret = -EINVAL;
542                 fs_err(sdp, "FS block size (%u) is too big for machine "
543                        "page size (%u)\n",
544                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
545                 goto out;
546         }
547         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
548
549         /* Get the root inode */
550         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
551         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
552         if (ret)
553                 goto out;
554
555         /* Get the master inode */
556         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
557         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
558         if (ret) {
559                 dput(sdp->sd_root_dir);
560                 goto out;
561         }
562         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
563 out:
564         gfs2_glock_dq_uninit(&sb_gh);
565         return ret;
566 }
567
568 /**
569  * map_journal_extents - create a reusable "extent" mapping from all logical
570  * blocks to all physical blocks for the given journal.  This will save
571  * us time when writing journal blocks.  Most journals will have only one
572  * extent that maps all their logical blocks.  That's because gfs2.mkfs
573  * arranges the journal blocks sequentially to maximize performance.
574  * So the extent would map the first block for the entire file length.
575  * However, gfs2_jadd can happen while file activity is happening, so
576  * those journals may not be sequential.  Less likely is the case where
577  * the users created their own journals by mounting the metafs and
578  * laying it out.  But it's still possible.  These journals might have
579  * several extents.
580  *
581  * TODO: This should be done in bigger chunks rather than one block at a time,
582  *       but since it's only done at mount time, I'm not worried about the
583  *       time it takes.
584  */
585 static int map_journal_extents(struct gfs2_sbd *sdp)
586 {
587         struct gfs2_jdesc *jd = sdp->sd_jdesc;
588         unsigned int lb;
589         u64 db, prev_db; /* logical block, disk block, prev disk block */
590         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
591         struct gfs2_journal_extent *jext = NULL;
592         struct buffer_head bh;
593         int rc = 0;
594
595         prev_db = 0;
596
597         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
598                 bh.b_state = 0;
599                 bh.b_blocknr = 0;
600                 bh.b_size = 1 << ip->i_inode.i_blkbits;
601                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
602                 db = bh.b_blocknr;
603                 if (rc || !db) {
604                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
605                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
606                         break;
607                 }
608                 if (!prev_db || db != prev_db + 1) {
609                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
610                                        GFP_KERNEL);
611                         if (!jext) {
612                                 printk(KERN_INFO "GFS2 error: out of memory "
613                                        "mapping journal extents.\n");
614                                 rc = -ENOMEM;
615                                 break;
616                         }
617                         jext->dblock = db;
618                         jext->lblock = lb;
619                         jext->blocks = 1;
620                         list_add_tail(&jext->extent_list, &jd->extent_list);
621                 } else {
622                         jext->blocks++;
623                 }
624                 prev_db = db;
625         }
626         return rc;
627 }
628
629 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
630 {
631         char *message = "FIRSTMOUNT=Done";
632         char *envp[] = { message, NULL };
633         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
634         ls->ls_first_done = 1;
635         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
636 }
637
638 /**
639  * gfs2_jindex_hold - Grab a lock on the jindex
640  * @sdp: The GFS2 superblock
641  * @ji_gh: the holder for the jindex glock
642  *
643  * Returns: errno
644  */
645
646 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
647 {
648         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
649         struct qstr name;
650         char buf[20];
651         struct gfs2_jdesc *jd;
652         int error;
653
654         name.name = buf;
655
656         mutex_lock(&sdp->sd_jindex_mutex);
657
658         for (;;) {
659                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
660                 if (error)
661                         break;
662
663                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
664                 name.hash = gfs2_disk_hash(name.name, name.len);
665
666                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
667                 if (error == -ENOENT) {
668                         error = 0;
669                         break;
670                 }
671
672                 gfs2_glock_dq_uninit(ji_gh);
673
674                 if (error)
675                         break;
676
677                 error = -ENOMEM;
678                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
679                 if (!jd)
680                         break;
681
682                 INIT_LIST_HEAD(&jd->extent_list);
683                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
684                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
685                         if (!jd->jd_inode)
686                                 error = -ENOENT;
687                         else
688                                 error = PTR_ERR(jd->jd_inode);
689                         kfree(jd);
690                         break;
691                 }
692
693                 spin_lock(&sdp->sd_jindex_spin);
694                 jd->jd_jid = sdp->sd_journals++;
695                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
696                 spin_unlock(&sdp->sd_jindex_spin);
697         }
698
699         mutex_unlock(&sdp->sd_jindex_mutex);
700
701         return error;
702 }
703
704 static int init_journal(struct gfs2_sbd *sdp, int undo)
705 {
706         struct inode *master = sdp->sd_master_dir->d_inode;
707         struct gfs2_holder ji_gh;
708         struct task_struct *p;
709         struct gfs2_inode *ip;
710         int jindex = 1;
711         int error = 0;
712
713         if (undo) {
714                 jindex = 0;
715                 goto fail_recoverd;
716         }
717
718         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
719         if (IS_ERR(sdp->sd_jindex)) {
720                 fs_err(sdp, "can't lookup journal index: %d\n", error);
721                 return PTR_ERR(sdp->sd_jindex);
722         }
723         ip = GFS2_I(sdp->sd_jindex);
724
725         /* Load in the journal index special file */
726
727         error = gfs2_jindex_hold(sdp, &ji_gh);
728         if (error) {
729                 fs_err(sdp, "can't read journal index: %d\n", error);
730                 goto fail;
731         }
732
733         error = -EINVAL;
734         if (!gfs2_jindex_size(sdp)) {
735                 fs_err(sdp, "no journals!\n");
736                 goto fail_jindex;
737         }
738
739         if (sdp->sd_args.ar_spectator) {
740                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
741                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
742         } else {
743                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
744                         fs_err(sdp, "can't mount journal #%u\n",
745                                sdp->sd_lockstruct.ls_jid);
746                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
747                                gfs2_jindex_size(sdp),
748                                gfs2_jindex_size(sdp) - 1);
749                         goto fail_jindex;
750                 }
751                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
752
753                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
754                                           &gfs2_journal_glops,
755                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
756                                           &sdp->sd_journal_gh);
757                 if (error) {
758                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
759                         goto fail_jindex;
760                 }
761
762                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
763                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
764                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
765                                            &sdp->sd_jinode_gh);
766                 if (error) {
767                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
768                                error);
769                         goto fail_journal_gh;
770                 }
771
772                 error = gfs2_jdesc_check(sdp->sd_jdesc);
773                 if (error) {
774                         fs_err(sdp, "my journal (%u) is bad: %d\n",
775                                sdp->sd_jdesc->jd_jid, error);
776                         goto fail_jinode_gh;
777                 }
778                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
779
780                 /* Map the extents for this journal's blocks */
781                 map_journal_extents(sdp);
782         }
783
784         if (sdp->sd_lockstruct.ls_first) {
785                 unsigned int x;
786                 for (x = 0; x < sdp->sd_journals; x++) {
787                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
788                         if (error) {
789                                 fs_err(sdp, "error recovering journal %u: %d\n",
790                                        x, error);
791                                 goto fail_jinode_gh;
792                         }
793                 }
794
795                 gfs2_others_may_mount(sdp);
796         } else if (!sdp->sd_args.ar_spectator) {
797                 error = gfs2_recover_journal(sdp->sd_jdesc);
798                 if (error) {
799                         fs_err(sdp, "error recovering my journal: %d\n", error);
800                         goto fail_jinode_gh;
801                 }
802         }
803
804         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
805         gfs2_glock_dq_uninit(&ji_gh);
806         jindex = 0;
807
808         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
809         error = IS_ERR(p);
810         if (error) {
811                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
812                 goto fail_jinode_gh;
813         }
814         sdp->sd_recoverd_process = p;
815
816         return 0;
817
818 fail_recoverd:
819         kthread_stop(sdp->sd_recoverd_process);
820 fail_jinode_gh:
821         if (!sdp->sd_args.ar_spectator)
822                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
823 fail_journal_gh:
824         if (!sdp->sd_args.ar_spectator)
825                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
826 fail_jindex:
827         gfs2_jindex_free(sdp);
828         if (jindex)
829                 gfs2_glock_dq_uninit(&ji_gh);
830 fail:
831         iput(sdp->sd_jindex);
832         return error;
833 }
834
835
836 static int init_inodes(struct gfs2_sbd *sdp, int undo)
837 {
838         int error = 0;
839         struct gfs2_inode *ip;
840         struct inode *master = sdp->sd_master_dir->d_inode;
841
842         if (undo)
843                 goto fail_qinode;
844
845         error = init_journal(sdp, undo);
846         if (error)
847                 goto fail;
848
849         /* Read in the master inode number inode */
850         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
851         if (IS_ERR(sdp->sd_inum_inode)) {
852                 error = PTR_ERR(sdp->sd_inum_inode);
853                 fs_err(sdp, "can't read in inum inode: %d\n", error);
854                 goto fail_journal;
855         }
856
857
858         /* Read in the master statfs inode */
859         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
860         if (IS_ERR(sdp->sd_statfs_inode)) {
861                 error = PTR_ERR(sdp->sd_statfs_inode);
862                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
863                 goto fail_inum;
864         }
865
866         /* Read in the resource index inode */
867         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
868         if (IS_ERR(sdp->sd_rindex)) {
869                 error = PTR_ERR(sdp->sd_rindex);
870                 fs_err(sdp, "can't get resource index inode: %d\n", error);
871                 goto fail_statfs;
872         }
873         ip = GFS2_I(sdp->sd_rindex);
874         sdp->sd_rindex_uptodate = 0;
875
876         /* Read in the quota inode */
877         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
878         if (IS_ERR(sdp->sd_quota_inode)) {
879                 error = PTR_ERR(sdp->sd_quota_inode);
880                 fs_err(sdp, "can't get quota file inode: %d\n", error);
881                 goto fail_rindex;
882         }
883         return 0;
884
885 fail_qinode:
886         iput(sdp->sd_quota_inode);
887 fail_rindex:
888         gfs2_clear_rgrpd(sdp);
889         iput(sdp->sd_rindex);
890 fail_statfs:
891         iput(sdp->sd_statfs_inode);
892 fail_inum:
893         iput(sdp->sd_inum_inode);
894 fail_journal:
895         init_journal(sdp, UNDO);
896 fail:
897         return error;
898 }
899
900 static int init_per_node(struct gfs2_sbd *sdp, int undo)
901 {
902         struct inode *pn = NULL;
903         char buf[30];
904         int error = 0;
905         struct gfs2_inode *ip;
906         struct inode *master = sdp->sd_master_dir->d_inode;
907
908         if (sdp->sd_args.ar_spectator)
909                 return 0;
910
911         if (undo)
912                 goto fail_qc_gh;
913
914         pn = gfs2_lookup_simple(master, "per_node");
915         if (IS_ERR(pn)) {
916                 error = PTR_ERR(pn);
917                 fs_err(sdp, "can't find per_node directory: %d\n", error);
918                 return error;
919         }
920
921         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
922         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
923         if (IS_ERR(sdp->sd_ir_inode)) {
924                 error = PTR_ERR(sdp->sd_ir_inode);
925                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
926                 goto fail;
927         }
928
929         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
930         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
931         if (IS_ERR(sdp->sd_sc_inode)) {
932                 error = PTR_ERR(sdp->sd_sc_inode);
933                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
934                 goto fail_ir_i;
935         }
936
937         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
938         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
939         if (IS_ERR(sdp->sd_qc_inode)) {
940                 error = PTR_ERR(sdp->sd_qc_inode);
941                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
942                 goto fail_ut_i;
943         }
944
945         iput(pn);
946         pn = NULL;
947
948         ip = GFS2_I(sdp->sd_ir_inode);
949         error = gfs2_glock_nq_init(ip->i_gl,
950                                    LM_ST_EXCLUSIVE, 0,
951                                    &sdp->sd_ir_gh);
952         if (error) {
953                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
954                 goto fail_qc_i;
955         }
956
957         ip = GFS2_I(sdp->sd_sc_inode);
958         error = gfs2_glock_nq_init(ip->i_gl,
959                                    LM_ST_EXCLUSIVE, 0,
960                                    &sdp->sd_sc_gh);
961         if (error) {
962                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
963                 goto fail_ir_gh;
964         }
965
966         ip = GFS2_I(sdp->sd_qc_inode);
967         error = gfs2_glock_nq_init(ip->i_gl,
968                                    LM_ST_EXCLUSIVE, 0,
969                                    &sdp->sd_qc_gh);
970         if (error) {
971                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
972                 goto fail_ut_gh;
973         }
974
975         return 0;
976
977 fail_qc_gh:
978         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
979 fail_ut_gh:
980         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
981 fail_ir_gh:
982         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
983 fail_qc_i:
984         iput(sdp->sd_qc_inode);
985 fail_ut_i:
986         iput(sdp->sd_sc_inode);
987 fail_ir_i:
988         iput(sdp->sd_ir_inode);
989 fail:
990         if (pn)
991                 iput(pn);
992         return error;
993 }
994
995 static int init_threads(struct gfs2_sbd *sdp, int undo)
996 {
997         struct task_struct *p;
998         int error = 0;
999
1000         if (undo)
1001                 goto fail_quotad;
1002
1003         sdp->sd_log_flush_time = jiffies;
1004
1005         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1006         error = IS_ERR(p);
1007         if (error) {
1008                 fs_err(sdp, "can't start logd thread: %d\n", error);
1009                 return error;
1010         }
1011         sdp->sd_logd_process = p;
1012
1013         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1014         error = IS_ERR(p);
1015         if (error) {
1016                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1017                 goto fail;
1018         }
1019         sdp->sd_quotad_process = p;
1020
1021         return 0;
1022
1023
1024 fail_quotad:
1025         kthread_stop(sdp->sd_quotad_process);
1026 fail:
1027         kthread_stop(sdp->sd_logd_process);
1028         return error;
1029 }
1030
1031 static const match_table_t nolock_tokens = {
1032         { Opt_jid, "jid=%d\n", },
1033         { Opt_err, NULL },
1034 };
1035
1036 static const struct lm_lockops nolock_ops = {
1037         .lm_proto_name = "lock_nolock",
1038         .lm_put_lock = kmem_cache_free,
1039         .lm_tokens = &nolock_tokens,
1040 };
1041
1042 /**
1043  * gfs2_lm_mount - mount a locking protocol
1044  * @sdp: the filesystem
1045  * @args: mount arguements
1046  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1047  *
1048  * Returns: errno
1049  */
1050
1051 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1052 {
1053         const struct lm_lockops *lm;
1054         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1055         struct gfs2_args *args = &sdp->sd_args;
1056         const char *proto = sdp->sd_proto_name;
1057         const char *table = sdp->sd_table_name;
1058         const char *fsname;
1059         char *o, *options;
1060         int ret;
1061
1062         if (!strcmp("lock_nolock", proto)) {
1063                 lm = &nolock_ops;
1064                 sdp->sd_args.ar_localflocks = 1;
1065                 sdp->sd_args.ar_localcaching = 1;
1066 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1067         } else if (!strcmp("lock_dlm", proto)) {
1068                 lm = &gfs2_dlm_ops;
1069 #endif
1070         } else {
1071                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1072                 return -ENOENT;
1073         }
1074
1075         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1076
1077         ls->ls_ops = lm;
1078         ls->ls_first = 1;
1079         ls->ls_id = 0;
1080
1081         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1082                 substring_t tmp[MAX_OPT_ARGS];
1083                 int token, option;
1084
1085                 if (!o || !*o)
1086                         continue;
1087
1088                 token = match_token(o, *lm->lm_tokens, tmp);
1089                 switch (token) {
1090                 case Opt_jid:
1091                         ret = match_int(&tmp[0], &option);
1092                         if (ret || option < 0) 
1093                                 goto hostdata_error;
1094                         ls->ls_jid = option;
1095                         break;
1096                 case Opt_id:
1097                         ret = match_int(&tmp[0], &option);
1098                         if (ret)
1099                                 goto hostdata_error;
1100                         ls->ls_id = option;
1101                         break;
1102                 case Opt_first:
1103                         ret = match_int(&tmp[0], &option);
1104                         if (ret || (option != 0 && option != 1))
1105                                 goto hostdata_error;
1106                         ls->ls_first = option;
1107                         break;
1108                 case Opt_nodir:
1109                         ret = match_int(&tmp[0], &option);
1110                         if (ret || (option != 0 && option != 1))
1111                                 goto hostdata_error;
1112                         ls->ls_nodir = option;
1113                         break;
1114                 case Opt_err:
1115                 default:
1116 hostdata_error:
1117                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1118                         return -EINVAL;
1119                 }
1120         }
1121
1122         if (sdp->sd_args.ar_spectator)
1123                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1124         else
1125                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1126                          sdp->sd_lockstruct.ls_jid);
1127
1128         fsname = strchr(table, ':');
1129         if (fsname)
1130                 fsname++;
1131         if (lm->lm_mount == NULL) {
1132                 fs_info(sdp, "Now mounting FS...\n");
1133                 return 0;
1134         }
1135         ret = lm->lm_mount(sdp, fsname);
1136         if (ret == 0)
1137                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1138         return ret;
1139 }
1140
1141 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1142 {
1143         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1144         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1145             lm->lm_unmount)
1146                 lm->lm_unmount(sdp);
1147 }
1148
1149 /**
1150  * fill_super - Read in superblock
1151  * @sb: The VFS superblock
1152  * @data: Mount options
1153  * @silent: Don't complain if it's not a GFS2 filesystem
1154  *
1155  * Returns: errno
1156  */
1157
1158 static int fill_super(struct super_block *sb, void *data, int silent)
1159 {
1160         struct gfs2_sbd *sdp;
1161         struct gfs2_holder mount_gh;
1162         int error;
1163
1164         sdp = init_sbd(sb);
1165         if (!sdp) {
1166                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1167                 return -ENOMEM;
1168         }
1169
1170         sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
1171         sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
1172
1173         error = gfs2_mount_args(sdp, &sdp->sd_args, data);
1174         if (error) {
1175                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1176                 goto fail;
1177         }
1178
1179         if (sdp->sd_args.ar_spectator)
1180                 sb->s_flags |= MS_RDONLY;
1181         if (sdp->sd_args.ar_posix_acl)
1182                 sb->s_flags |= MS_POSIXACL;
1183
1184         sb->s_magic = GFS2_MAGIC;
1185         sb->s_op = &gfs2_super_ops;
1186         sb->s_export_op = &gfs2_export_ops;
1187         sb->s_time_gran = 1;
1188         sb->s_maxbytes = MAX_LFS_FILESIZE;
1189
1190         /* Set up the buffer cache and fill in some fake block size values
1191            to allow us to read-in the on-disk superblock. */
1192         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1193         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1194         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1195                                GFS2_BASIC_BLOCK_SHIFT;
1196         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1197
1198         error = init_names(sdp, silent);
1199         if (error)
1200                 goto fail;
1201
1202         gfs2_create_debugfs_file(sdp);
1203
1204         error = gfs2_sys_fs_add(sdp);
1205         if (error)
1206                 goto fail;
1207
1208         error = gfs2_lm_mount(sdp, silent);
1209         if (error)
1210                 goto fail_sys;
1211
1212         error = init_locking(sdp, &mount_gh, DO);
1213         if (error)
1214                 goto fail_lm;
1215
1216         error = init_sb(sdp, silent);
1217         if (error)
1218                 goto fail_locking;
1219
1220         error = init_inodes(sdp, DO);
1221         if (error)
1222                 goto fail_sb;
1223
1224         error = init_per_node(sdp, DO);
1225         if (error)
1226                 goto fail_inodes;
1227
1228         error = gfs2_statfs_init(sdp);
1229         if (error) {
1230                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1231                 goto fail_per_node;
1232         }
1233
1234         error = init_threads(sdp, DO);
1235         if (error)
1236                 goto fail_per_node;
1237
1238         if (!(sb->s_flags & MS_RDONLY)) {
1239                 error = gfs2_make_fs_rw(sdp);
1240                 if (error) {
1241                         fs_err(sdp, "can't make FS RW: %d\n", error);
1242                         goto fail_threads;
1243                 }
1244         }
1245
1246         gfs2_glock_dq_uninit(&mount_gh);
1247
1248         return 0;
1249
1250 fail_threads:
1251         init_threads(sdp, UNDO);
1252 fail_per_node:
1253         init_per_node(sdp, UNDO);
1254 fail_inodes:
1255         init_inodes(sdp, UNDO);
1256 fail_sb:
1257         if (sdp->sd_root_dir)
1258                 dput(sdp->sd_root_dir);
1259         if (sdp->sd_master_dir)
1260                 dput(sdp->sd_master_dir);
1261         if (sb->s_root)
1262                 dput(sb->s_root);
1263         sb->s_root = NULL;
1264 fail_locking:
1265         init_locking(sdp, &mount_gh, UNDO);
1266 fail_lm:
1267         gfs2_gl_hash_clear(sdp);
1268         gfs2_lm_unmount(sdp);
1269         while (invalidate_inodes(sb))
1270                 yield();
1271 fail_sys:
1272         gfs2_sys_fs_del(sdp);
1273 fail:
1274         gfs2_delete_debugfs_file(sdp);
1275         kfree(sdp);
1276         sb->s_fs_info = NULL;
1277         return error;
1278 }
1279
1280 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1281                        const char *dev_name, void *data, struct vfsmount *mnt)
1282 {
1283         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1284 }
1285
1286 static struct super_block *get_gfs2_sb(const char *dev_name)
1287 {
1288         struct super_block *sb;
1289         struct nameidata nd;
1290         int error;
1291
1292         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1293         if (error) {
1294                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1295                        dev_name, error);
1296                 return NULL;
1297         }
1298         sb = nd.path.dentry->d_inode->i_sb;
1299         if (sb && (sb->s_type == &gfs2_fs_type))
1300                 atomic_inc(&sb->s_active);
1301         else
1302                 sb = NULL;
1303         path_put(&nd.path);
1304         return sb;
1305 }
1306
1307 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1308                             const char *dev_name, void *data, struct vfsmount *mnt)
1309 {
1310         struct super_block *sb = NULL;
1311         struct gfs2_sbd *sdp;
1312
1313         sb = get_gfs2_sb(dev_name);
1314         if (!sb) {
1315                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1316                 return -ENOENT;
1317         }
1318         sdp = sb->s_fs_info;
1319         mnt->mnt_sb = sb;
1320         mnt->mnt_root = dget(sdp->sd_master_dir);
1321         return 0;
1322 }
1323
1324 static void gfs2_kill_sb(struct super_block *sb)
1325 {
1326         struct gfs2_sbd *sdp = sb->s_fs_info;
1327
1328         if (sdp == NULL) {
1329                 kill_block_super(sb);
1330                 return;
1331         }
1332
1333         gfs2_meta_syncfs(sdp);
1334         dput(sdp->sd_root_dir);
1335         dput(sdp->sd_master_dir);
1336         sdp->sd_root_dir = NULL;
1337         sdp->sd_master_dir = NULL;
1338         shrink_dcache_sb(sb);
1339         kill_block_super(sb);
1340         gfs2_delete_debugfs_file(sdp);
1341         kfree(sdp);
1342 }
1343
1344 struct file_system_type gfs2_fs_type = {
1345         .name = "gfs2",
1346         .fs_flags = FS_REQUIRES_DEV,
1347         .get_sb = gfs2_get_sb,
1348         .kill_sb = gfs2_kill_sb,
1349         .owner = THIS_MODULE,
1350 };
1351
1352 struct file_system_type gfs2meta_fs_type = {
1353         .name = "gfs2meta",
1354         .fs_flags = FS_REQUIRES_DEV,
1355         .get_sb = gfs2_get_sb_meta,
1356         .owner = THIS_MODULE,
1357 };
1358