GFS2: Clean up of glops.c
[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         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         if (unlikely(!bio)) {
276                 __free_page(page);
277                 return -ENOBUFS;
278         }
279
280         bio->bi_sector = sector * (sb->s_blocksize >> 9);
281         bio->bi_bdev = sb->s_bdev;
282         bio_add_page(bio, page, PAGE_SIZE, 0);
283
284         bio->bi_end_io = end_bio_io_page;
285         bio->bi_private = page;
286         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
287         wait_on_page_locked(page);
288         bio_put(bio);
289         if (!PageUptodate(page)) {
290                 __free_page(page);
291                 return -EIO;
292         }
293         p = kmap(page);
294         gfs2_sb_in(&sdp->sd_sb, p);
295         kunmap(page);
296         __free_page(page);
297         return 0;
298 }
299
300 /**
301  * gfs2_read_sb - Read super block
302  * @sdp: The GFS2 superblock
303  * @silent: Don't print message if mount fails
304  *
305  */
306
307 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
308 {
309         u32 hash_blocks, ind_blocks, leaf_blocks;
310         u32 tmp_blocks;
311         unsigned int x;
312         int error;
313
314         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
315         if (error) {
316                 if (!silent)
317                         fs_err(sdp, "can't read superblock\n");
318                 return error;
319         }
320
321         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
322         if (error)
323                 return error;
324
325         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
326                                GFS2_BASIC_BLOCK_SHIFT;
327         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
328         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
329                           sizeof(struct gfs2_dinode)) / sizeof(u64);
330         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
331                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
332         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
333         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
334         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
335         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
336         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
337                                 sizeof(struct gfs2_meta_header)) /
338                                 sizeof(struct gfs2_quota_change);
339
340         /* Compute maximum reservation required to add a entry to a directory */
341
342         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
343                              sdp->sd_jbsize);
344
345         ind_blocks = 0;
346         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
347                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
348                 ind_blocks += tmp_blocks;
349         }
350
351         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
352
353         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
354
355         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
356                                 sizeof(struct gfs2_dinode);
357         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
358         for (x = 2;; x++) {
359                 u64 space, d;
360                 u32 m;
361
362                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
363                 d = space;
364                 m = do_div(d, sdp->sd_inptrs);
365
366                 if (d != sdp->sd_heightsize[x - 1] || m)
367                         break;
368                 sdp->sd_heightsize[x] = space;
369         }
370         sdp->sd_max_height = x;
371         sdp->sd_heightsize[x] = ~0;
372         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
373
374         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
375                                  sizeof(struct gfs2_dinode);
376         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
377         for (x = 2;; x++) {
378                 u64 space, d;
379                 u32 m;
380
381                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
382                 d = space;
383                 m = do_div(d, sdp->sd_inptrs);
384
385                 if (d != sdp->sd_jheightsize[x - 1] || m)
386                         break;
387                 sdp->sd_jheightsize[x] = space;
388         }
389         sdp->sd_max_jheight = x;
390         sdp->sd_jheightsize[x] = ~0;
391         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
392
393         return 0;
394 }
395
396 static int init_names(struct gfs2_sbd *sdp, int silent)
397 {
398         char *proto, *table;
399         int error = 0;
400
401         proto = sdp->sd_args.ar_lockproto;
402         table = sdp->sd_args.ar_locktable;
403
404         /*  Try to autodetect  */
405
406         if (!proto[0] || !table[0]) {
407                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
408                 if (error)
409                         return error;
410
411                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
412                 if (error)
413                         goto out;
414
415                 if (!proto[0])
416                         proto = sdp->sd_sb.sb_lockproto;
417                 if (!table[0])
418                         table = sdp->sd_sb.sb_locktable;
419         }
420
421         if (!table[0])
422                 table = sdp->sd_vfs->s_id;
423
424         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
425         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
426
427         table = sdp->sd_table_name;
428         while ((table = strchr(table, '/')))
429                 *table = '_';
430
431 out:
432         return error;
433 }
434
435 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
436                         int undo)
437 {
438         int error = 0;
439
440         if (undo)
441                 goto fail_trans;
442
443         error = gfs2_glock_nq_num(sdp,
444                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
445                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
446                                   mount_gh);
447         if (error) {
448                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
449                 goto fail;
450         }
451
452         error = gfs2_glock_nq_num(sdp,
453                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
454                                   LM_ST_SHARED,
455                                   LM_FLAG_NOEXP | GL_EXACT,
456                                   &sdp->sd_live_gh);
457         if (error) {
458                 fs_err(sdp, "can't acquire live glock: %d\n", error);
459                 goto fail_mount;
460         }
461
462         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
463                                CREATE, &sdp->sd_rename_gl);
464         if (error) {
465                 fs_err(sdp, "can't create rename glock: %d\n", error);
466                 goto fail_live;
467         }
468
469         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
470                                CREATE, &sdp->sd_trans_gl);
471         if (error) {
472                 fs_err(sdp, "can't create transaction glock: %d\n", error);
473                 goto fail_rename;
474         }
475
476         return 0;
477
478 fail_trans:
479         gfs2_glock_put(sdp->sd_trans_gl);
480 fail_rename:
481         gfs2_glock_put(sdp->sd_rename_gl);
482 fail_live:
483         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
484 fail_mount:
485         gfs2_glock_dq_uninit(mount_gh);
486 fail:
487         return error;
488 }
489
490 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
491                             u64 no_addr, const char *name)
492 {
493         struct gfs2_sbd *sdp = sb->s_fs_info;
494         struct dentry *dentry;
495         struct inode *inode;
496
497         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
498         if (IS_ERR(inode)) {
499                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
500                 return PTR_ERR(inode);
501         }
502         dentry = d_alloc_root(inode);
503         if (!dentry) {
504                 fs_err(sdp, "can't alloc %s dentry\n", name);
505                 iput(inode);
506                 return -ENOMEM;
507         }
508         dentry->d_op = &gfs2_dops;
509         *dptr = dentry;
510         return 0;
511 }
512
513 static int init_sb(struct gfs2_sbd *sdp, int silent)
514 {
515         struct super_block *sb = sdp->sd_vfs;
516         struct gfs2_holder sb_gh;
517         u64 no_addr;
518         int ret;
519
520         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
521                                 LM_ST_SHARED, 0, &sb_gh);
522         if (ret) {
523                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
524                 return ret;
525         }
526
527         ret = gfs2_read_sb(sdp, silent);
528         if (ret) {
529                 fs_err(sdp, "can't read superblock: %d\n", ret);
530                 goto out;
531         }
532
533         /* Set up the buffer cache and SB for real */
534         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
535                 ret = -EINVAL;
536                 fs_err(sdp, "FS block size (%u) is too small for device "
537                        "block size (%u)\n",
538                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
539                 goto out;
540         }
541         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
542                 ret = -EINVAL;
543                 fs_err(sdp, "FS block size (%u) is too big for machine "
544                        "page size (%u)\n",
545                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
546                 goto out;
547         }
548         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
549
550         /* Get the root inode */
551         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
552         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
553         if (ret)
554                 goto out;
555
556         /* Get the master inode */
557         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
558         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
559         if (ret) {
560                 dput(sdp->sd_root_dir);
561                 goto out;
562         }
563         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
564 out:
565         gfs2_glock_dq_uninit(&sb_gh);
566         return ret;
567 }
568
569 /**
570  * map_journal_extents - create a reusable "extent" mapping from all logical
571  * blocks to all physical blocks for the given journal.  This will save
572  * us time when writing journal blocks.  Most journals will have only one
573  * extent that maps all their logical blocks.  That's because gfs2.mkfs
574  * arranges the journal blocks sequentially to maximize performance.
575  * So the extent would map the first block for the entire file length.
576  * However, gfs2_jadd can happen while file activity is happening, so
577  * those journals may not be sequential.  Less likely is the case where
578  * the users created their own journals by mounting the metafs and
579  * laying it out.  But it's still possible.  These journals might have
580  * several extents.
581  *
582  * TODO: This should be done in bigger chunks rather than one block at a time,
583  *       but since it's only done at mount time, I'm not worried about the
584  *       time it takes.
585  */
586 static int map_journal_extents(struct gfs2_sbd *sdp)
587 {
588         struct gfs2_jdesc *jd = sdp->sd_jdesc;
589         unsigned int lb;
590         u64 db, prev_db; /* logical block, disk block, prev disk block */
591         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
592         struct gfs2_journal_extent *jext = NULL;
593         struct buffer_head bh;
594         int rc = 0;
595
596         prev_db = 0;
597
598         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
599                 bh.b_state = 0;
600                 bh.b_blocknr = 0;
601                 bh.b_size = 1 << ip->i_inode.i_blkbits;
602                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
603                 db = bh.b_blocknr;
604                 if (rc || !db) {
605                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
606                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
607                         break;
608                 }
609                 if (!prev_db || db != prev_db + 1) {
610                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
611                                        GFP_KERNEL);
612                         if (!jext) {
613                                 printk(KERN_INFO "GFS2 error: out of memory "
614                                        "mapping journal extents.\n");
615                                 rc = -ENOMEM;
616                                 break;
617                         }
618                         jext->dblock = db;
619                         jext->lblock = lb;
620                         jext->blocks = 1;
621                         list_add_tail(&jext->extent_list, &jd->extent_list);
622                 } else {
623                         jext->blocks++;
624                 }
625                 prev_db = db;
626         }
627         return rc;
628 }
629
630 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
631 {
632         char *message = "FIRSTMOUNT=Done";
633         char *envp[] = { message, NULL };
634         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
635         ls->ls_first_done = 1;
636         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
637 }
638
639 /**
640  * gfs2_jindex_hold - Grab a lock on the jindex
641  * @sdp: The GFS2 superblock
642  * @ji_gh: the holder for the jindex glock
643  *
644  * Returns: errno
645  */
646
647 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
648 {
649         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
650         struct qstr name;
651         char buf[20];
652         struct gfs2_jdesc *jd;
653         int error;
654
655         name.name = buf;
656
657         mutex_lock(&sdp->sd_jindex_mutex);
658
659         for (;;) {
660                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
661                 if (error)
662                         break;
663
664                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
665                 name.hash = gfs2_disk_hash(name.name, name.len);
666
667                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
668                 if (error == -ENOENT) {
669                         error = 0;
670                         break;
671                 }
672
673                 gfs2_glock_dq_uninit(ji_gh);
674
675                 if (error)
676                         break;
677
678                 error = -ENOMEM;
679                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
680                 if (!jd)
681                         break;
682
683                 INIT_LIST_HEAD(&jd->extent_list);
684                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
685                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
686                         if (!jd->jd_inode)
687                                 error = -ENOENT;
688                         else
689                                 error = PTR_ERR(jd->jd_inode);
690                         kfree(jd);
691                         break;
692                 }
693
694                 spin_lock(&sdp->sd_jindex_spin);
695                 jd->jd_jid = sdp->sd_journals++;
696                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
697                 spin_unlock(&sdp->sd_jindex_spin);
698         }
699
700         mutex_unlock(&sdp->sd_jindex_mutex);
701
702         return error;
703 }
704
705 static int init_journal(struct gfs2_sbd *sdp, int undo)
706 {
707         struct inode *master = sdp->sd_master_dir->d_inode;
708         struct gfs2_holder ji_gh;
709         struct task_struct *p;
710         struct gfs2_inode *ip;
711         int jindex = 1;
712         int error = 0;
713
714         if (undo) {
715                 jindex = 0;
716                 goto fail_recoverd;
717         }
718
719         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
720         if (IS_ERR(sdp->sd_jindex)) {
721                 fs_err(sdp, "can't lookup journal index: %d\n", error);
722                 return PTR_ERR(sdp->sd_jindex);
723         }
724         ip = GFS2_I(sdp->sd_jindex);
725
726         /* Load in the journal index special file */
727
728         error = gfs2_jindex_hold(sdp, &ji_gh);
729         if (error) {
730                 fs_err(sdp, "can't read journal index: %d\n", error);
731                 goto fail;
732         }
733
734         error = -EINVAL;
735         if (!gfs2_jindex_size(sdp)) {
736                 fs_err(sdp, "no journals!\n");
737                 goto fail_jindex;
738         }
739
740         if (sdp->sd_args.ar_spectator) {
741                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
742                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
743         } else {
744                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
745                         fs_err(sdp, "can't mount journal #%u\n",
746                                sdp->sd_lockstruct.ls_jid);
747                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
748                                gfs2_jindex_size(sdp),
749                                gfs2_jindex_size(sdp) - 1);
750                         goto fail_jindex;
751                 }
752                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
753
754                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
755                                           &gfs2_journal_glops,
756                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
757                                           &sdp->sd_journal_gh);
758                 if (error) {
759                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
760                         goto fail_jindex;
761                 }
762
763                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
764                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
765                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
766                                            &sdp->sd_jinode_gh);
767                 if (error) {
768                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
769                                error);
770                         goto fail_journal_gh;
771                 }
772
773                 error = gfs2_jdesc_check(sdp->sd_jdesc);
774                 if (error) {
775                         fs_err(sdp, "my journal (%u) is bad: %d\n",
776                                sdp->sd_jdesc->jd_jid, error);
777                         goto fail_jinode_gh;
778                 }
779                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
780
781                 /* Map the extents for this journal's blocks */
782                 map_journal_extents(sdp);
783         }
784
785         if (sdp->sd_lockstruct.ls_first) {
786                 unsigned int x;
787                 for (x = 0; x < sdp->sd_journals; x++) {
788                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
789                         if (error) {
790                                 fs_err(sdp, "error recovering journal %u: %d\n",
791                                        x, error);
792                                 goto fail_jinode_gh;
793                         }
794                 }
795
796                 gfs2_others_may_mount(sdp);
797         } else if (!sdp->sd_args.ar_spectator) {
798                 error = gfs2_recover_journal(sdp->sd_jdesc);
799                 if (error) {
800                         fs_err(sdp, "error recovering my journal: %d\n", error);
801                         goto fail_jinode_gh;
802                 }
803         }
804
805         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
806         gfs2_glock_dq_uninit(&ji_gh);
807         jindex = 0;
808
809         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
810         error = IS_ERR(p);
811         if (error) {
812                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
813                 goto fail_jinode_gh;
814         }
815         sdp->sd_recoverd_process = p;
816
817         return 0;
818
819 fail_recoverd:
820         kthread_stop(sdp->sd_recoverd_process);
821 fail_jinode_gh:
822         if (!sdp->sd_args.ar_spectator)
823                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
824 fail_journal_gh:
825         if (!sdp->sd_args.ar_spectator)
826                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
827 fail_jindex:
828         gfs2_jindex_free(sdp);
829         if (jindex)
830                 gfs2_glock_dq_uninit(&ji_gh);
831 fail:
832         iput(sdp->sd_jindex);
833         return error;
834 }
835
836
837 static int init_inodes(struct gfs2_sbd *sdp, int undo)
838 {
839         int error = 0;
840         struct gfs2_inode *ip;
841         struct inode *master = sdp->sd_master_dir->d_inode;
842
843         if (undo)
844                 goto fail_qinode;
845
846         error = init_journal(sdp, undo);
847         if (error)
848                 goto fail;
849
850         /* Read in the master inode number inode */
851         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
852         if (IS_ERR(sdp->sd_inum_inode)) {
853                 error = PTR_ERR(sdp->sd_inum_inode);
854                 fs_err(sdp, "can't read in inum inode: %d\n", error);
855                 goto fail_journal;
856         }
857
858
859         /* Read in the master statfs inode */
860         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
861         if (IS_ERR(sdp->sd_statfs_inode)) {
862                 error = PTR_ERR(sdp->sd_statfs_inode);
863                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
864                 goto fail_inum;
865         }
866
867         /* Read in the resource index inode */
868         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
869         if (IS_ERR(sdp->sd_rindex)) {
870                 error = PTR_ERR(sdp->sd_rindex);
871                 fs_err(sdp, "can't get resource index inode: %d\n", error);
872                 goto fail_statfs;
873         }
874         ip = GFS2_I(sdp->sd_rindex);
875         sdp->sd_rindex_uptodate = 0;
876
877         /* Read in the quota inode */
878         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
879         if (IS_ERR(sdp->sd_quota_inode)) {
880                 error = PTR_ERR(sdp->sd_quota_inode);
881                 fs_err(sdp, "can't get quota file inode: %d\n", error);
882                 goto fail_rindex;
883         }
884         return 0;
885
886 fail_qinode:
887         iput(sdp->sd_quota_inode);
888 fail_rindex:
889         gfs2_clear_rgrpd(sdp);
890         iput(sdp->sd_rindex);
891 fail_statfs:
892         iput(sdp->sd_statfs_inode);
893 fail_inum:
894         iput(sdp->sd_inum_inode);
895 fail_journal:
896         init_journal(sdp, UNDO);
897 fail:
898         return error;
899 }
900
901 static int init_per_node(struct gfs2_sbd *sdp, int undo)
902 {
903         struct inode *pn = NULL;
904         char buf[30];
905         int error = 0;
906         struct gfs2_inode *ip;
907         struct inode *master = sdp->sd_master_dir->d_inode;
908
909         if (sdp->sd_args.ar_spectator)
910                 return 0;
911
912         if (undo)
913                 goto fail_qc_gh;
914
915         pn = gfs2_lookup_simple(master, "per_node");
916         if (IS_ERR(pn)) {
917                 error = PTR_ERR(pn);
918                 fs_err(sdp, "can't find per_node directory: %d\n", error);
919                 return error;
920         }
921
922         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
923         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
924         if (IS_ERR(sdp->sd_ir_inode)) {
925                 error = PTR_ERR(sdp->sd_ir_inode);
926                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
927                 goto fail;
928         }
929
930         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
931         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
932         if (IS_ERR(sdp->sd_sc_inode)) {
933                 error = PTR_ERR(sdp->sd_sc_inode);
934                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
935                 goto fail_ir_i;
936         }
937
938         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
939         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
940         if (IS_ERR(sdp->sd_qc_inode)) {
941                 error = PTR_ERR(sdp->sd_qc_inode);
942                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
943                 goto fail_ut_i;
944         }
945
946         iput(pn);
947         pn = NULL;
948
949         ip = GFS2_I(sdp->sd_ir_inode);
950         error = gfs2_glock_nq_init(ip->i_gl,
951                                    LM_ST_EXCLUSIVE, 0,
952                                    &sdp->sd_ir_gh);
953         if (error) {
954                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
955                 goto fail_qc_i;
956         }
957
958         ip = GFS2_I(sdp->sd_sc_inode);
959         error = gfs2_glock_nq_init(ip->i_gl,
960                                    LM_ST_EXCLUSIVE, 0,
961                                    &sdp->sd_sc_gh);
962         if (error) {
963                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
964                 goto fail_ir_gh;
965         }
966
967         ip = GFS2_I(sdp->sd_qc_inode);
968         error = gfs2_glock_nq_init(ip->i_gl,
969                                    LM_ST_EXCLUSIVE, 0,
970                                    &sdp->sd_qc_gh);
971         if (error) {
972                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
973                 goto fail_ut_gh;
974         }
975
976         return 0;
977
978 fail_qc_gh:
979         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
980 fail_ut_gh:
981         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
982 fail_ir_gh:
983         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
984 fail_qc_i:
985         iput(sdp->sd_qc_inode);
986 fail_ut_i:
987         iput(sdp->sd_sc_inode);
988 fail_ir_i:
989         iput(sdp->sd_ir_inode);
990 fail:
991         if (pn)
992                 iput(pn);
993         return error;
994 }
995
996 static int init_threads(struct gfs2_sbd *sdp, int undo)
997 {
998         struct task_struct *p;
999         int error = 0;
1000
1001         if (undo)
1002                 goto fail_quotad;
1003
1004         sdp->sd_log_flush_time = jiffies;
1005
1006         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1007         error = IS_ERR(p);
1008         if (error) {
1009                 fs_err(sdp, "can't start logd thread: %d\n", error);
1010                 return error;
1011         }
1012         sdp->sd_logd_process = p;
1013
1014         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1015         error = IS_ERR(p);
1016         if (error) {
1017                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1018                 goto fail;
1019         }
1020         sdp->sd_quotad_process = p;
1021
1022         return 0;
1023
1024
1025 fail_quotad:
1026         kthread_stop(sdp->sd_quotad_process);
1027 fail:
1028         kthread_stop(sdp->sd_logd_process);
1029         return error;
1030 }
1031
1032 static const match_table_t nolock_tokens = {
1033         { Opt_jid, "jid=%d\n", },
1034         { Opt_err, NULL },
1035 };
1036
1037 static const struct lm_lockops nolock_ops = {
1038         .lm_proto_name = "lock_nolock",
1039         .lm_put_lock = kmem_cache_free,
1040         .lm_tokens = &nolock_tokens,
1041 };
1042
1043 /**
1044  * gfs2_lm_mount - mount a locking protocol
1045  * @sdp: the filesystem
1046  * @args: mount arguements
1047  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1048  *
1049  * Returns: errno
1050  */
1051
1052 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1053 {
1054         const struct lm_lockops *lm;
1055         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1056         struct gfs2_args *args = &sdp->sd_args;
1057         const char *proto = sdp->sd_proto_name;
1058         const char *table = sdp->sd_table_name;
1059         const char *fsname;
1060         char *o, *options;
1061         int ret;
1062
1063         if (!strcmp("lock_nolock", proto)) {
1064                 lm = &nolock_ops;
1065                 sdp->sd_args.ar_localflocks = 1;
1066                 sdp->sd_args.ar_localcaching = 1;
1067 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1068         } else if (!strcmp("lock_dlm", proto)) {
1069                 lm = &gfs2_dlm_ops;
1070 #endif
1071         } else {
1072                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1073                 return -ENOENT;
1074         }
1075
1076         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1077
1078         ls->ls_ops = lm;
1079         ls->ls_first = 1;
1080         ls->ls_id = 0;
1081
1082         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1083                 substring_t tmp[MAX_OPT_ARGS];
1084                 int token, option;
1085
1086                 if (!o || !*o)
1087                         continue;
1088
1089                 token = match_token(o, *lm->lm_tokens, tmp);
1090                 switch (token) {
1091                 case Opt_jid:
1092                         ret = match_int(&tmp[0], &option);
1093                         if (ret || option < 0) 
1094                                 goto hostdata_error;
1095                         ls->ls_jid = option;
1096                         break;
1097                 case Opt_id:
1098                         ret = match_int(&tmp[0], &option);
1099                         if (ret)
1100                                 goto hostdata_error;
1101                         ls->ls_id = option;
1102                         break;
1103                 case Opt_first:
1104                         ret = match_int(&tmp[0], &option);
1105                         if (ret || (option != 0 && option != 1))
1106                                 goto hostdata_error;
1107                         ls->ls_first = option;
1108                         break;
1109                 case Opt_nodir:
1110                         ret = match_int(&tmp[0], &option);
1111                         if (ret || (option != 0 && option != 1))
1112                                 goto hostdata_error;
1113                         ls->ls_nodir = option;
1114                         break;
1115                 case Opt_err:
1116                 default:
1117 hostdata_error:
1118                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1119                         return -EINVAL;
1120                 }
1121         }
1122
1123         if (sdp->sd_args.ar_spectator)
1124                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1125         else
1126                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1127                          sdp->sd_lockstruct.ls_jid);
1128
1129         fsname = strchr(table, ':');
1130         if (fsname)
1131                 fsname++;
1132         if (lm->lm_mount == NULL) {
1133                 fs_info(sdp, "Now mounting FS...\n");
1134                 return 0;
1135         }
1136         ret = lm->lm_mount(sdp, fsname);
1137         if (ret == 0)
1138                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1139         return ret;
1140 }
1141
1142 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1143 {
1144         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1145         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1146             lm->lm_unmount)
1147                 lm->lm_unmount(sdp);
1148 }
1149
1150 /**
1151  * fill_super - Read in superblock
1152  * @sb: The VFS superblock
1153  * @data: Mount options
1154  * @silent: Don't complain if it's not a GFS2 filesystem
1155  *
1156  * Returns: errno
1157  */
1158
1159 static int fill_super(struct super_block *sb, void *data, int silent)
1160 {
1161         struct gfs2_sbd *sdp;
1162         struct gfs2_holder mount_gh;
1163         int error;
1164
1165         sdp = init_sbd(sb);
1166         if (!sdp) {
1167                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1168                 return -ENOMEM;
1169         }
1170
1171         sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
1172         sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
1173
1174         error = gfs2_mount_args(sdp, &sdp->sd_args, data);
1175         if (error) {
1176                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1177                 goto fail;
1178         }
1179
1180         if (sdp->sd_args.ar_spectator)
1181                 sb->s_flags |= MS_RDONLY;
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         error = init_names(sdp, silent);
1200         if (error)
1201                 goto fail;
1202
1203         gfs2_create_debugfs_file(sdp);
1204
1205         error = gfs2_sys_fs_add(sdp);
1206         if (error)
1207                 goto fail;
1208
1209         error = gfs2_lm_mount(sdp, silent);
1210         if (error)
1211                 goto fail_sys;
1212
1213         error = init_locking(sdp, &mount_gh, DO);
1214         if (error)
1215                 goto fail_lm;
1216
1217         error = init_sb(sdp, silent);
1218         if (error)
1219                 goto fail_locking;
1220
1221         error = init_inodes(sdp, DO);
1222         if (error)
1223                 goto fail_sb;
1224
1225         error = init_per_node(sdp, DO);
1226         if (error)
1227                 goto fail_inodes;
1228
1229         error = gfs2_statfs_init(sdp);
1230         if (error) {
1231                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1232                 goto fail_per_node;
1233         }
1234
1235         error = init_threads(sdp, DO);
1236         if (error)
1237                 goto fail_per_node;
1238
1239         if (!(sb->s_flags & MS_RDONLY)) {
1240                 error = gfs2_make_fs_rw(sdp);
1241                 if (error) {
1242                         fs_err(sdp, "can't make FS RW: %d\n", error);
1243                         goto fail_threads;
1244                 }
1245         }
1246
1247         gfs2_glock_dq_uninit(&mount_gh);
1248
1249         return 0;
1250
1251 fail_threads:
1252         init_threads(sdp, UNDO);
1253 fail_per_node:
1254         init_per_node(sdp, UNDO);
1255 fail_inodes:
1256         init_inodes(sdp, UNDO);
1257 fail_sb:
1258         if (sdp->sd_root_dir)
1259                 dput(sdp->sd_root_dir);
1260         if (sdp->sd_master_dir)
1261                 dput(sdp->sd_master_dir);
1262         if (sb->s_root)
1263                 dput(sb->s_root);
1264         sb->s_root = NULL;
1265 fail_locking:
1266         init_locking(sdp, &mount_gh, UNDO);
1267 fail_lm:
1268         gfs2_gl_hash_clear(sdp);
1269         gfs2_lm_unmount(sdp);
1270         while (invalidate_inodes(sb))
1271                 yield();
1272 fail_sys:
1273         gfs2_sys_fs_del(sdp);
1274 fail:
1275         gfs2_delete_debugfs_file(sdp);
1276         kfree(sdp);
1277         sb->s_fs_info = NULL;
1278         return error;
1279 }
1280
1281 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1282                        const char *dev_name, void *data, struct vfsmount *mnt)
1283 {
1284         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1285 }
1286
1287 static struct super_block *get_gfs2_sb(const char *dev_name)
1288 {
1289         struct super_block *sb;
1290         struct nameidata nd;
1291         int error;
1292
1293         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1294         if (error) {
1295                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1296                        dev_name, error);
1297                 return NULL;
1298         }
1299         sb = nd.path.dentry->d_inode->i_sb;
1300         if (sb && (sb->s_type == &gfs2_fs_type))
1301                 atomic_inc(&sb->s_active);
1302         else
1303                 sb = NULL;
1304         path_put(&nd.path);
1305         return sb;
1306 }
1307
1308 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1309                             const char *dev_name, void *data, struct vfsmount *mnt)
1310 {
1311         struct super_block *sb = NULL;
1312         struct gfs2_sbd *sdp;
1313
1314         sb = get_gfs2_sb(dev_name);
1315         if (!sb) {
1316                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1317                 return -ENOENT;
1318         }
1319         sdp = sb->s_fs_info;
1320         mnt->mnt_sb = sb;
1321         mnt->mnt_root = dget(sdp->sd_master_dir);
1322         return 0;
1323 }
1324
1325 static void gfs2_kill_sb(struct super_block *sb)
1326 {
1327         struct gfs2_sbd *sdp = sb->s_fs_info;
1328
1329         if (sdp == NULL) {
1330                 kill_block_super(sb);
1331                 return;
1332         }
1333
1334         gfs2_meta_syncfs(sdp);
1335         dput(sdp->sd_root_dir);
1336         dput(sdp->sd_master_dir);
1337         sdp->sd_root_dir = NULL;
1338         sdp->sd_master_dir = NULL;
1339         shrink_dcache_sb(sb);
1340         kill_block_super(sb);
1341         gfs2_delete_debugfs_file(sdp);
1342         kfree(sdp);
1343 }
1344
1345 struct file_system_type gfs2_fs_type = {
1346         .name = "gfs2",
1347         .fs_flags = FS_REQUIRES_DEV,
1348         .get_sb = gfs2_get_sb,
1349         .kill_sb = gfs2_kill_sb,
1350         .owner = THIS_MODULE,
1351 };
1352
1353 struct file_system_type gfs2meta_fs_type = {
1354         .name = "gfs2meta",
1355         .fs_flags = FS_REQUIRES_DEV,
1356         .get_sb = gfs2_get_sb_meta,
1357         .owner = THIS_MODULE,
1358 };
1359