GFS2: Wait for journal id on mount if not specified on mount command line
[linux-2.6.git] / fs / gfs2 / ops_fstype.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/blkdev.h>
16 #include <linux/kthread.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/slow-work.h>
21 #include <linux/quotaops.h>
22
23 #include "gfs2.h"
24 #include "incore.h"
25 #include "bmap.h"
26 #include "glock.h"
27 #include "glops.h"
28 #include "inode.h"
29 #include "recovery.h"
30 #include "rgrp.h"
31 #include "super.h"
32 #include "sys.h"
33 #include "util.h"
34 #include "log.h"
35 #include "quota.h"
36 #include "dir.h"
37 #include "trace_gfs2.h"
38
39 #define DO 0
40 #define UNDO 1
41
42 static const u32 gfs2_old_fs_formats[] = {
43         0
44 };
45
46 static const u32 gfs2_old_multihost_formats[] = {
47         0
48 };
49
50 /**
51  * gfs2_tune_init - Fill a gfs2_tune structure with default values
52  * @gt: tune
53  *
54  */
55
56 static void gfs2_tune_init(struct gfs2_tune *gt)
57 {
58         spin_lock_init(&gt->gt_spin);
59
60         gt->gt_quota_simul_sync = 64;
61         gt->gt_quota_warn_period = 10;
62         gt->gt_quota_scale_num = 1;
63         gt->gt_quota_scale_den = 1;
64         gt->gt_new_files_jdata = 0;
65         gt->gt_max_readahead = 1 << 18;
66         gt->gt_complain_secs = 10;
67 }
68
69 static struct gfs2_sbd *init_sbd(struct super_block *sb)
70 {
71         struct gfs2_sbd *sdp;
72
73         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
74         if (!sdp)
75                 return NULL;
76
77         sb->s_fs_info = sdp;
78         sdp->sd_vfs = sb;
79         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
80         gfs2_tune_init(&sdp->sd_tune);
81
82         init_waitqueue_head(&sdp->sd_glock_wait);
83         atomic_set(&sdp->sd_glock_disposal, 0);
84         spin_lock_init(&sdp->sd_statfs_spin);
85
86         spin_lock_init(&sdp->sd_rindex_spin);
87         mutex_init(&sdp->sd_rindex_mutex);
88         INIT_LIST_HEAD(&sdp->sd_rindex_list);
89         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
90
91         INIT_LIST_HEAD(&sdp->sd_jindex_list);
92         spin_lock_init(&sdp->sd_jindex_spin);
93         mutex_init(&sdp->sd_jindex_mutex);
94
95         INIT_LIST_HEAD(&sdp->sd_quota_list);
96         mutex_init(&sdp->sd_quota_mutex);
97         init_waitqueue_head(&sdp->sd_quota_wait);
98         INIT_LIST_HEAD(&sdp->sd_trunc_list);
99         spin_lock_init(&sdp->sd_trunc_lock);
100
101         spin_lock_init(&sdp->sd_log_lock);
102         atomic_set(&sdp->sd_log_pinned, 0);
103         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
104         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
105         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
106         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
107         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
108
109         init_waitqueue_head(&sdp->sd_log_waitq);
110         init_waitqueue_head(&sdp->sd_logd_waitq);
111         INIT_LIST_HEAD(&sdp->sd_ail1_list);
112         INIT_LIST_HEAD(&sdp->sd_ail2_list);
113
114         init_rwsem(&sdp->sd_log_flush_lock);
115         atomic_set(&sdp->sd_log_in_flight, 0);
116         init_waitqueue_head(&sdp->sd_log_flush_wait);
117
118         INIT_LIST_HEAD(&sdp->sd_revoke_list);
119
120         mutex_init(&sdp->sd_freeze_lock);
121
122         return sdp;
123 }
124
125
126 /**
127  * gfs2_check_sb - Check superblock
128  * @sdp: the filesystem
129  * @sb: The superblock
130  * @silent: Don't print a message if the check fails
131  *
132  * Checks the version code of the FS is one that we understand how to
133  * read and that the sizes of the various on-disk structures have not
134  * changed.
135  */
136
137 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
138 {
139         unsigned int x;
140
141         if (sb->sb_magic != GFS2_MAGIC ||
142             sb->sb_type != GFS2_METATYPE_SB) {
143                 if (!silent)
144                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
145                 return -EINVAL;
146         }
147
148         /*  If format numbers match exactly, we're done.  */
149
150         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
151             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
152                 return 0;
153
154         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
155                 for (x = 0; gfs2_old_fs_formats[x]; x++)
156                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
157                                 break;
158
159                 if (!gfs2_old_fs_formats[x]) {
160                         printk(KERN_WARNING
161                                "GFS2: code version (%u, %u) is incompatible "
162                                "with ondisk format (%u, %u)\n",
163                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
164                                sb->sb_fs_format, sb->sb_multihost_format);
165                         printk(KERN_WARNING
166                                "GFS2: I don't know how to upgrade this FS\n");
167                         return -EINVAL;
168                 }
169         }
170
171         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
172                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
173                         if (gfs2_old_multihost_formats[x] ==
174                             sb->sb_multihost_format)
175                                 break;
176
177                 if (!gfs2_old_multihost_formats[x]) {
178                         printk(KERN_WARNING
179                                "GFS2: code version (%u, %u) is incompatible "
180                                "with ondisk format (%u, %u)\n",
181                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
182                                sb->sb_fs_format, sb->sb_multihost_format);
183                         printk(KERN_WARNING
184                                "GFS2: I don't know how to upgrade this FS\n");
185                         return -EINVAL;
186                 }
187         }
188
189         if (!sdp->sd_args.ar_upgrade) {
190                 printk(KERN_WARNING
191                        "GFS2: code version (%u, %u) is incompatible "
192                        "with ondisk format (%u, %u)\n",
193                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
194                        sb->sb_fs_format, sb->sb_multihost_format);
195                 printk(KERN_INFO
196                        "GFS2: Use the \"upgrade\" mount option to upgrade "
197                        "the FS\n");
198                 printk(KERN_INFO "GFS2: See the manual for more details\n");
199                 return -EINVAL;
200         }
201
202         return 0;
203 }
204
205 static void end_bio_io_page(struct bio *bio, int error)
206 {
207         struct page *page = bio->bi_private;
208
209         if (!error)
210                 SetPageUptodate(page);
211         else
212                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
213         unlock_page(page);
214 }
215
216 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
217 {
218         const struct gfs2_sb *str = buf;
219
220         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
221         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
222         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
223         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
224         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
225         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
226         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
227         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
228         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
229         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
230         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
231
232         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
233         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
234         memcpy(sb->sb_uuid, str->sb_uuid, 16);
235 }
236
237 /**
238  * gfs2_read_super - Read the gfs2 super block from disk
239  * @sdp: The GFS2 super block
240  * @sector: The location of the super block
241  * @error: The error code to return
242  *
243  * This uses the bio functions to read the super block from disk
244  * because we want to be 100% sure that we never read cached data.
245  * A super block is read twice only during each GFS2 mount and is
246  * never written to by the filesystem. The first time its read no
247  * locks are held, and the only details which are looked at are those
248  * relating to the locking protocol. Once locking is up and working,
249  * the sb is read again under the lock to establish the location of
250  * the master directory (contains pointers to journals etc) and the
251  * root directory.
252  *
253  * Returns: 0 on success or error
254  */
255
256 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
257 {
258         struct super_block *sb = sdp->sd_vfs;
259         struct gfs2_sb *p;
260         struct page *page;
261         struct bio *bio;
262
263         page = alloc_page(GFP_NOFS);
264         if (unlikely(!page))
265                 return -ENOBUFS;
266
267         ClearPageUptodate(page);
268         ClearPageDirty(page);
269         lock_page(page);
270
271         bio = bio_alloc(GFP_NOFS, 1);
272         bio->bi_sector = sector * (sb->s_blocksize >> 9);
273         bio->bi_bdev = sb->s_bdev;
274         bio_add_page(bio, page, PAGE_SIZE, 0);
275
276         bio->bi_end_io = end_bio_io_page;
277         bio->bi_private = page;
278         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
279         wait_on_page_locked(page);
280         bio_put(bio);
281         if (!PageUptodate(page)) {
282                 __free_page(page);
283                 return -EIO;
284         }
285         p = kmap(page);
286         gfs2_sb_in(&sdp->sd_sb, p);
287         kunmap(page);
288         __free_page(page);
289         return 0;
290 }
291
292 /**
293  * gfs2_read_sb - Read super block
294  * @sdp: The GFS2 superblock
295  * @silent: Don't print message if mount fails
296  *
297  */
298
299 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
300 {
301         u32 hash_blocks, ind_blocks, leaf_blocks;
302         u32 tmp_blocks;
303         unsigned int x;
304         int error;
305
306         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
307         if (error) {
308                 if (!silent)
309                         fs_err(sdp, "can't read superblock\n");
310                 return error;
311         }
312
313         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
314         if (error)
315                 return error;
316
317         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
318                                GFS2_BASIC_BLOCK_SHIFT;
319         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
320         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
321                           sizeof(struct gfs2_dinode)) / sizeof(u64);
322         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
323                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
324         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
325         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
326         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
327         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
328         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
329                                 sizeof(struct gfs2_meta_header)) /
330                                 sizeof(struct gfs2_quota_change);
331
332         /* Compute maximum reservation required to add a entry to a directory */
333
334         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
335                              sdp->sd_jbsize);
336
337         ind_blocks = 0;
338         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
339                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
340                 ind_blocks += tmp_blocks;
341         }
342
343         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
344
345         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
346
347         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
348                                 sizeof(struct gfs2_dinode);
349         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
350         for (x = 2;; x++) {
351                 u64 space, d;
352                 u32 m;
353
354                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
355                 d = space;
356                 m = do_div(d, sdp->sd_inptrs);
357
358                 if (d != sdp->sd_heightsize[x - 1] || m)
359                         break;
360                 sdp->sd_heightsize[x] = space;
361         }
362         sdp->sd_max_height = x;
363         sdp->sd_heightsize[x] = ~0;
364         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
365
366         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
367                                  sizeof(struct gfs2_dinode);
368         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
369         for (x = 2;; x++) {
370                 u64 space, d;
371                 u32 m;
372
373                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
374                 d = space;
375                 m = do_div(d, sdp->sd_inptrs);
376
377                 if (d != sdp->sd_jheightsize[x - 1] || m)
378                         break;
379                 sdp->sd_jheightsize[x] = space;
380         }
381         sdp->sd_max_jheight = x;
382         sdp->sd_jheightsize[x] = ~0;
383         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
384
385         return 0;
386 }
387
388 static int init_names(struct gfs2_sbd *sdp, int silent)
389 {
390         char *proto, *table;
391         int error = 0;
392
393         proto = sdp->sd_args.ar_lockproto;
394         table = sdp->sd_args.ar_locktable;
395
396         /*  Try to autodetect  */
397
398         if (!proto[0] || !table[0]) {
399                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
400                 if (error)
401                         return error;
402
403                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
404                 if (error)
405                         goto out;
406
407                 if (!proto[0])
408                         proto = sdp->sd_sb.sb_lockproto;
409                 if (!table[0])
410                         table = sdp->sd_sb.sb_locktable;
411         }
412
413         if (!table[0])
414                 table = sdp->sd_vfs->s_id;
415
416         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
417         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
418
419         table = sdp->sd_table_name;
420         while ((table = strchr(table, '/')))
421                 *table = '_';
422
423 out:
424         return error;
425 }
426
427 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
428                         int undo)
429 {
430         int error = 0;
431
432         if (undo)
433                 goto fail_trans;
434
435         error = gfs2_glock_nq_num(sdp,
436                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
437                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
438                                   mount_gh);
439         if (error) {
440                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
441                 goto fail;
442         }
443
444         error = gfs2_glock_nq_num(sdp,
445                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
446                                   LM_ST_SHARED,
447                                   LM_FLAG_NOEXP | GL_EXACT,
448                                   &sdp->sd_live_gh);
449         if (error) {
450                 fs_err(sdp, "can't acquire live glock: %d\n", error);
451                 goto fail_mount;
452         }
453
454         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
455                                CREATE, &sdp->sd_rename_gl);
456         if (error) {
457                 fs_err(sdp, "can't create rename glock: %d\n", error);
458                 goto fail_live;
459         }
460
461         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
462                                CREATE, &sdp->sd_trans_gl);
463         if (error) {
464                 fs_err(sdp, "can't create transaction glock: %d\n", error);
465                 goto fail_rename;
466         }
467
468         return 0;
469
470 fail_trans:
471         gfs2_glock_put(sdp->sd_trans_gl);
472 fail_rename:
473         gfs2_glock_put(sdp->sd_rename_gl);
474 fail_live:
475         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
476 fail_mount:
477         gfs2_glock_dq_uninit(mount_gh);
478 fail:
479         return error;
480 }
481
482 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
483                             u64 no_addr, const char *name)
484 {
485         struct gfs2_sbd *sdp = sb->s_fs_info;
486         struct dentry *dentry;
487         struct inode *inode;
488
489         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
490         if (IS_ERR(inode)) {
491                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
492                 return PTR_ERR(inode);
493         }
494         dentry = d_alloc_root(inode);
495         if (!dentry) {
496                 fs_err(sdp, "can't alloc %s dentry\n", name);
497                 iput(inode);
498                 return -ENOMEM;
499         }
500         dentry->d_op = &gfs2_dops;
501         *dptr = dentry;
502         return 0;
503 }
504
505 static int init_sb(struct gfs2_sbd *sdp, int silent)
506 {
507         struct super_block *sb = sdp->sd_vfs;
508         struct gfs2_holder sb_gh;
509         u64 no_addr;
510         int ret;
511
512         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
513                                 LM_ST_SHARED, 0, &sb_gh);
514         if (ret) {
515                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
516                 return ret;
517         }
518
519         ret = gfs2_read_sb(sdp, silent);
520         if (ret) {
521                 fs_err(sdp, "can't read superblock: %d\n", ret);
522                 goto out;
523         }
524
525         /* Set up the buffer cache and SB for real */
526         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
527                 ret = -EINVAL;
528                 fs_err(sdp, "FS block size (%u) is too small for device "
529                        "block size (%u)\n",
530                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
531                 goto out;
532         }
533         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
534                 ret = -EINVAL;
535                 fs_err(sdp, "FS block size (%u) is too big for machine "
536                        "page size (%u)\n",
537                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
538                 goto out;
539         }
540         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
541
542         /* Get the root inode */
543         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
544         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
545         if (ret)
546                 goto out;
547
548         /* Get the master inode */
549         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
550         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
551         if (ret) {
552                 dput(sdp->sd_root_dir);
553                 goto out;
554         }
555         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
556 out:
557         gfs2_glock_dq_uninit(&sb_gh);
558         return ret;
559 }
560
561 /**
562  * map_journal_extents - create a reusable "extent" mapping from all logical
563  * blocks to all physical blocks for the given journal.  This will save
564  * us time when writing journal blocks.  Most journals will have only one
565  * extent that maps all their logical blocks.  That's because gfs2.mkfs
566  * arranges the journal blocks sequentially to maximize performance.
567  * So the extent would map the first block for the entire file length.
568  * However, gfs2_jadd can happen while file activity is happening, so
569  * those journals may not be sequential.  Less likely is the case where
570  * the users created their own journals by mounting the metafs and
571  * laying it out.  But it's still possible.  These journals might have
572  * several extents.
573  *
574  * TODO: This should be done in bigger chunks rather than one block at a time,
575  *       but since it's only done at mount time, I'm not worried about the
576  *       time it takes.
577  */
578 static int map_journal_extents(struct gfs2_sbd *sdp)
579 {
580         struct gfs2_jdesc *jd = sdp->sd_jdesc;
581         unsigned int lb;
582         u64 db, prev_db; /* logical block, disk block, prev disk block */
583         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
584         struct gfs2_journal_extent *jext = NULL;
585         struct buffer_head bh;
586         int rc = 0;
587
588         prev_db = 0;
589
590         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
591                 bh.b_state = 0;
592                 bh.b_blocknr = 0;
593                 bh.b_size = 1 << ip->i_inode.i_blkbits;
594                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
595                 db = bh.b_blocknr;
596                 if (rc || !db) {
597                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
598                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
599                         break;
600                 }
601                 if (!prev_db || db != prev_db + 1) {
602                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
603                                        GFP_KERNEL);
604                         if (!jext) {
605                                 printk(KERN_INFO "GFS2 error: out of memory "
606                                        "mapping journal extents.\n");
607                                 rc = -ENOMEM;
608                                 break;
609                         }
610                         jext->dblock = db;
611                         jext->lblock = lb;
612                         jext->blocks = 1;
613                         list_add_tail(&jext->extent_list, &jd->extent_list);
614                 } else {
615                         jext->blocks++;
616                 }
617                 prev_db = db;
618         }
619         return rc;
620 }
621
622 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
623 {
624         char *message = "FIRSTMOUNT=Done";
625         char *envp[] = { message, NULL };
626         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
627         ls->ls_first_done = 1;
628         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
629 }
630
631 /**
632  * gfs2_jindex_hold - Grab a lock on the jindex
633  * @sdp: The GFS2 superblock
634  * @ji_gh: the holder for the jindex glock
635  *
636  * Returns: errno
637  */
638
639 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
640 {
641         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
642         struct qstr name;
643         char buf[20];
644         struct gfs2_jdesc *jd;
645         int error;
646
647         name.name = buf;
648
649         mutex_lock(&sdp->sd_jindex_mutex);
650
651         for (;;) {
652                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
653                 if (error)
654                         break;
655
656                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
657                 name.hash = gfs2_disk_hash(name.name, name.len);
658
659                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
660                 if (error == -ENOENT) {
661                         error = 0;
662                         break;
663                 }
664
665                 gfs2_glock_dq_uninit(ji_gh);
666
667                 if (error)
668                         break;
669
670                 error = -ENOMEM;
671                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
672                 if (!jd)
673                         break;
674
675                 INIT_LIST_HEAD(&jd->extent_list);
676                 slow_work_init(&jd->jd_work, &gfs2_recover_ops);
677                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
678                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
679                         if (!jd->jd_inode)
680                                 error = -ENOENT;
681                         else
682                                 error = PTR_ERR(jd->jd_inode);
683                         kfree(jd);
684                         break;
685                 }
686
687                 spin_lock(&sdp->sd_jindex_spin);
688                 jd->jd_jid = sdp->sd_journals++;
689                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
690                 spin_unlock(&sdp->sd_jindex_spin);
691         }
692
693         mutex_unlock(&sdp->sd_jindex_mutex);
694
695         return error;
696 }
697
698 static int init_journal(struct gfs2_sbd *sdp, int undo)
699 {
700         struct inode *master = sdp->sd_master_dir->d_inode;
701         struct gfs2_holder ji_gh;
702         struct gfs2_inode *ip;
703         int jindex = 1;
704         int error = 0;
705
706         if (undo) {
707                 jindex = 0;
708                 goto fail_jinode_gh;
709         }
710
711         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
712         if (IS_ERR(sdp->sd_jindex)) {
713                 fs_err(sdp, "can't lookup journal index: %d\n", error);
714                 return PTR_ERR(sdp->sd_jindex);
715         }
716         ip = GFS2_I(sdp->sd_jindex);
717
718         /* Load in the journal index special file */
719
720         error = gfs2_jindex_hold(sdp, &ji_gh);
721         if (error) {
722                 fs_err(sdp, "can't read journal index: %d\n", error);
723                 goto fail;
724         }
725
726         error = -EUSERS;
727         if (!gfs2_jindex_size(sdp)) {
728                 fs_err(sdp, "no journals!\n");
729                 goto fail_jindex;
730         }
731
732         if (sdp->sd_args.ar_spectator) {
733                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
734                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
735                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
736                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
737         } else {
738                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
739                         fs_err(sdp, "can't mount journal #%u\n",
740                                sdp->sd_lockstruct.ls_jid);
741                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
742                                gfs2_jindex_size(sdp),
743                                gfs2_jindex_size(sdp) - 1);
744                         goto fail_jindex;
745                 }
746                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
747
748                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
749                                           &gfs2_journal_glops,
750                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
751                                           &sdp->sd_journal_gh);
752                 if (error) {
753                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
754                         goto fail_jindex;
755                 }
756
757                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
758                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
759                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
760                                            &sdp->sd_jinode_gh);
761                 if (error) {
762                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
763                                error);
764                         goto fail_journal_gh;
765                 }
766
767                 error = gfs2_jdesc_check(sdp->sd_jdesc);
768                 if (error) {
769                         fs_err(sdp, "my journal (%u) is bad: %d\n",
770                                sdp->sd_jdesc->jd_jid, error);
771                         goto fail_jinode_gh;
772                 }
773                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
774                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
775                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
776
777                 /* Map the extents for this journal's blocks */
778                 map_journal_extents(sdp);
779         }
780         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
781
782         if (sdp->sd_lockstruct.ls_first) {
783                 unsigned int x;
784                 for (x = 0; x < sdp->sd_journals; x++) {
785                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
786                         if (error) {
787                                 fs_err(sdp, "error recovering journal %u: %d\n",
788                                        x, error);
789                                 goto fail_jinode_gh;
790                         }
791                 }
792
793                 gfs2_others_may_mount(sdp);
794         } else if (!sdp->sd_args.ar_spectator) {
795                 error = gfs2_recover_journal(sdp->sd_jdesc);
796                 if (error) {
797                         fs_err(sdp, "error recovering my journal: %d\n", error);
798                         goto fail_jinode_gh;
799                 }
800         }
801
802         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
803         gfs2_glock_dq_uninit(&ji_gh);
804         jindex = 0;
805
806         return 0;
807
808 fail_jinode_gh:
809         if (!sdp->sd_args.ar_spectator)
810                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
811 fail_journal_gh:
812         if (!sdp->sd_args.ar_spectator)
813                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
814 fail_jindex:
815         gfs2_jindex_free(sdp);
816         if (jindex)
817                 gfs2_glock_dq_uninit(&ji_gh);
818 fail:
819         iput(sdp->sd_jindex);
820         return error;
821 }
822
823
824 static int init_inodes(struct gfs2_sbd *sdp, int undo)
825 {
826         int error = 0;
827         struct gfs2_inode *ip;
828         struct inode *master = sdp->sd_master_dir->d_inode;
829
830         if (undo)
831                 goto fail_qinode;
832
833         error = init_journal(sdp, undo);
834         if (error)
835                 goto fail;
836
837         /* Read in the master statfs inode */
838         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
839         if (IS_ERR(sdp->sd_statfs_inode)) {
840                 error = PTR_ERR(sdp->sd_statfs_inode);
841                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
842                 goto fail_journal;
843         }
844
845         /* Read in the resource index inode */
846         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
847         if (IS_ERR(sdp->sd_rindex)) {
848                 error = PTR_ERR(sdp->sd_rindex);
849                 fs_err(sdp, "can't get resource index inode: %d\n", error);
850                 goto fail_statfs;
851         }
852         ip = GFS2_I(sdp->sd_rindex);
853         sdp->sd_rindex_uptodate = 0;
854
855         /* Read in the quota inode */
856         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
857         if (IS_ERR(sdp->sd_quota_inode)) {
858                 error = PTR_ERR(sdp->sd_quota_inode);
859                 fs_err(sdp, "can't get quota file inode: %d\n", error);
860                 goto fail_rindex;
861         }
862         return 0;
863
864 fail_qinode:
865         iput(sdp->sd_quota_inode);
866 fail_rindex:
867         gfs2_clear_rgrpd(sdp);
868         iput(sdp->sd_rindex);
869 fail_statfs:
870         iput(sdp->sd_statfs_inode);
871 fail_journal:
872         init_journal(sdp, UNDO);
873 fail:
874         return error;
875 }
876
877 static int init_per_node(struct gfs2_sbd *sdp, int undo)
878 {
879         struct inode *pn = NULL;
880         char buf[30];
881         int error = 0;
882         struct gfs2_inode *ip;
883         struct inode *master = sdp->sd_master_dir->d_inode;
884
885         if (sdp->sd_args.ar_spectator)
886                 return 0;
887
888         if (undo)
889                 goto fail_qc_gh;
890
891         pn = gfs2_lookup_simple(master, "per_node");
892         if (IS_ERR(pn)) {
893                 error = PTR_ERR(pn);
894                 fs_err(sdp, "can't find per_node directory: %d\n", error);
895                 return error;
896         }
897
898         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
899         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
900         if (IS_ERR(sdp->sd_sc_inode)) {
901                 error = PTR_ERR(sdp->sd_sc_inode);
902                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
903                 goto fail;
904         }
905
906         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
907         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
908         if (IS_ERR(sdp->sd_qc_inode)) {
909                 error = PTR_ERR(sdp->sd_qc_inode);
910                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
911                 goto fail_ut_i;
912         }
913
914         iput(pn);
915         pn = NULL;
916
917         ip = GFS2_I(sdp->sd_sc_inode);
918         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
919                                    &sdp->sd_sc_gh);
920         if (error) {
921                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
922                 goto fail_qc_i;
923         }
924
925         ip = GFS2_I(sdp->sd_qc_inode);
926         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
927                                    &sdp->sd_qc_gh);
928         if (error) {
929                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
930                 goto fail_ut_gh;
931         }
932
933         return 0;
934
935 fail_qc_gh:
936         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
937 fail_ut_gh:
938         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
939 fail_qc_i:
940         iput(sdp->sd_qc_inode);
941 fail_ut_i:
942         iput(sdp->sd_sc_inode);
943 fail:
944         if (pn)
945                 iput(pn);
946         return error;
947 }
948
949 static int init_threads(struct gfs2_sbd *sdp, int undo)
950 {
951         struct task_struct *p;
952         int error = 0;
953
954         if (undo)
955                 goto fail_quotad;
956
957         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
958         error = IS_ERR(p);
959         if (error) {
960                 fs_err(sdp, "can't start logd thread: %d\n", error);
961                 return error;
962         }
963         sdp->sd_logd_process = p;
964
965         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
966         error = IS_ERR(p);
967         if (error) {
968                 fs_err(sdp, "can't start quotad thread: %d\n", error);
969                 goto fail;
970         }
971         sdp->sd_quotad_process = p;
972
973         return 0;
974
975
976 fail_quotad:
977         kthread_stop(sdp->sd_quotad_process);
978 fail:
979         kthread_stop(sdp->sd_logd_process);
980         return error;
981 }
982
983 static const match_table_t nolock_tokens = {
984         { Opt_jid, "jid=%d\n", },
985         { Opt_err, NULL },
986 };
987
988 static void nolock_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl)
989 {
990         struct gfs2_sbd *sdp = gl->gl_sbd;
991         kmem_cache_free(cachep, gl);
992         if (atomic_dec_and_test(&sdp->sd_glock_disposal))
993                 wake_up(&sdp->sd_glock_wait);
994 }
995
996 static const struct lm_lockops nolock_ops = {
997         .lm_proto_name = "lock_nolock",
998         .lm_put_lock = nolock_put_lock,
999         .lm_tokens = &nolock_tokens,
1000 };
1001
1002 /**
1003  * gfs2_lm_mount - mount a locking protocol
1004  * @sdp: the filesystem
1005  * @args: mount arguments
1006  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1007  *
1008  * Returns: errno
1009  */
1010
1011 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1012 {
1013         const struct lm_lockops *lm;
1014         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1015         struct gfs2_args *args = &sdp->sd_args;
1016         const char *proto = sdp->sd_proto_name;
1017         const char *table = sdp->sd_table_name;
1018         const char *fsname;
1019         char *o, *options;
1020         int ret;
1021
1022         if (!strcmp("lock_nolock", proto)) {
1023                 lm = &nolock_ops;
1024                 sdp->sd_args.ar_localflocks = 1;
1025                 sdp->sd_args.ar_localcaching = 1;
1026 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1027         } else if (!strcmp("lock_dlm", proto)) {
1028                 lm = &gfs2_dlm_ops;
1029 #endif
1030         } else {
1031                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1032                 return -ENOENT;
1033         }
1034
1035         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1036
1037         ls->ls_ops = lm;
1038         ls->ls_first = 1;
1039
1040         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1041                 substring_t tmp[MAX_OPT_ARGS];
1042                 int token, option;
1043
1044                 if (!o || !*o)
1045                         continue;
1046
1047                 token = match_token(o, *lm->lm_tokens, tmp);
1048                 switch (token) {
1049                 case Opt_jid:
1050                         ret = match_int(&tmp[0], &option);
1051                         if (ret || option < 0) 
1052                                 goto hostdata_error;
1053                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1054                                 ls->ls_jid = option;
1055                         break;
1056                 case Opt_id:
1057                         /* Obsolete, but left for backward compat purposes */
1058                         break;
1059                 case Opt_first:
1060                         ret = match_int(&tmp[0], &option);
1061                         if (ret || (option != 0 && option != 1))
1062                                 goto hostdata_error;
1063                         ls->ls_first = option;
1064                         break;
1065                 case Opt_nodir:
1066                         ret = match_int(&tmp[0], &option);
1067                         if (ret || (option != 0 && option != 1))
1068                                 goto hostdata_error;
1069                         ls->ls_nodir = option;
1070                         break;
1071                 case Opt_err:
1072                 default:
1073 hostdata_error:
1074                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1075                         return -EINVAL;
1076                 }
1077         }
1078
1079         if (sdp->sd_args.ar_spectator)
1080                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1081         else
1082                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1083                          sdp->sd_lockstruct.ls_jid);
1084
1085         fsname = strchr(table, ':');
1086         if (fsname)
1087                 fsname++;
1088         if (lm->lm_mount == NULL) {
1089                 fs_info(sdp, "Now mounting FS...\n");
1090                 return 0;
1091         }
1092         ret = lm->lm_mount(sdp, fsname);
1093         if (ret == 0)
1094                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1095         return ret;
1096 }
1097
1098 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1099 {
1100         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1101         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1102             lm->lm_unmount)
1103                 lm->lm_unmount(sdp);
1104 }
1105
1106 static int gfs2_journalid_wait(void *word)
1107 {
1108         if (signal_pending(current))
1109                 return -EINTR;
1110         schedule();
1111         return 0;
1112 }
1113
1114 static int wait_on_journal(struct gfs2_sbd *sdp)
1115 {
1116         if (sdp->sd_args.ar_spectator)
1117                 return 0;
1118         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1119                 return 0;
1120
1121         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1122 }
1123
1124 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1125 {
1126         struct super_block *sb = sdp->sd_vfs;
1127         char ro[20];
1128         char spectator[20];
1129         char *envp[] = { ro, spectator, NULL };
1130         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1131         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1132         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1133 }
1134
1135 /**
1136  * fill_super - Read in superblock
1137  * @sb: The VFS superblock
1138  * @data: Mount options
1139  * @silent: Don't complain if it's not a GFS2 filesystem
1140  *
1141  * Returns: errno
1142  */
1143
1144 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1145 {
1146         struct gfs2_sbd *sdp;
1147         struct gfs2_holder mount_gh;
1148         int error;
1149
1150         sdp = init_sbd(sb);
1151         if (!sdp) {
1152                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1153                 return -ENOMEM;
1154         }
1155         sdp->sd_args = *args;
1156
1157         if (sdp->sd_args.ar_spectator) {
1158                 sb->s_flags |= MS_RDONLY;
1159                 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
1160         }
1161         if (sdp->sd_args.ar_posix_acl)
1162                 sb->s_flags |= MS_POSIXACL;
1163         if (sdp->sd_args.ar_nobarrier)
1164                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1165
1166         sb->s_magic = GFS2_MAGIC;
1167         sb->s_op = &gfs2_super_ops;
1168         sb->s_export_op = &gfs2_export_ops;
1169         sb->s_xattr = gfs2_xattr_handlers;
1170         sb->s_qcop = &gfs2_quotactl_ops;
1171         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1172         sb->s_time_gran = 1;
1173         sb->s_maxbytes = MAX_LFS_FILESIZE;
1174
1175         /* Set up the buffer cache and fill in some fake block size values
1176            to allow us to read-in the on-disk superblock. */
1177         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1178         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1179         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1180                                GFS2_BASIC_BLOCK_SHIFT;
1181         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1182
1183         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1184         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1185         if (sdp->sd_args.ar_statfs_quantum) {
1186                 sdp->sd_tune.gt_statfs_slow = 0;
1187                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1188         }
1189         else {
1190                 sdp->sd_tune.gt_statfs_slow = 1;
1191                 sdp->sd_tune.gt_statfs_quantum = 30;
1192         }
1193
1194         error = init_names(sdp, silent);
1195         if (error)
1196                 goto fail;
1197
1198         gfs2_create_debugfs_file(sdp);
1199
1200         error = gfs2_sys_fs_add(sdp);
1201         if (error)
1202                 goto fail;
1203
1204         error = gfs2_lm_mount(sdp, silent);
1205         if (error)
1206                 goto fail_sys;
1207
1208         error = init_locking(sdp, &mount_gh, DO);
1209         if (error)
1210                 goto fail_lm;
1211
1212         error = init_sb(sdp, silent);
1213         if (error)
1214                 goto fail_locking;
1215
1216         error = wait_on_journal(sdp);
1217         if (error)
1218                 goto fail_sb;
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         gfs2_online_uevent(sdp);
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         invalidate_inodes(sb);
1268         gfs2_gl_hash_clear(sdp);
1269         gfs2_lm_unmount(sdp);
1270 fail_sys:
1271         gfs2_sys_fs_del(sdp);
1272 fail:
1273         gfs2_delete_debugfs_file(sdp);
1274         kfree(sdp);
1275         sb->s_fs_info = NULL;
1276         return error;
1277 }
1278
1279 static int set_gfs2_super(struct super_block *s, void *data)
1280 {
1281         s->s_bdev = data;
1282         s->s_dev = s->s_bdev->bd_dev;
1283
1284         /*
1285          * We set the bdi here to the queue backing, file systems can
1286          * overwrite this in ->fill_super()
1287          */
1288         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1289         return 0;
1290 }
1291
1292 static int test_gfs2_super(struct super_block *s, void *ptr)
1293 {
1294         struct block_device *bdev = ptr;
1295         return (bdev == s->s_bdev);
1296 }
1297
1298 /**
1299  * gfs2_get_sb - Get the GFS2 superblock
1300  * @fs_type: The GFS2 filesystem type
1301  * @flags: Mount flags
1302  * @dev_name: The name of the device
1303  * @data: The mount arguments
1304  * @mnt: The vfsmnt for this mount
1305  *
1306  * Q. Why not use get_sb_bdev() ?
1307  * A. We need to select one of two root directories to mount, independent
1308  *    of whether this is the initial, or subsequent, mount of this sb
1309  *
1310  * Returns: 0 or -ve on error
1311  */
1312
1313 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1314                        const char *dev_name, void *data, struct vfsmount *mnt)
1315 {
1316         struct block_device *bdev;
1317         struct super_block *s;
1318         fmode_t mode = FMODE_READ;
1319         int error;
1320         struct gfs2_args args;
1321         struct gfs2_sbd *sdp;
1322
1323         if (!(flags & MS_RDONLY))
1324                 mode |= FMODE_WRITE;
1325
1326         bdev = open_bdev_exclusive(dev_name, mode, fs_type);
1327         if (IS_ERR(bdev))
1328                 return PTR_ERR(bdev);
1329
1330         /*
1331          * once the super is inserted into the list by sget, s_umount
1332          * will protect the lockfs code from trying to start a snapshot
1333          * while we are mounting
1334          */
1335         mutex_lock(&bdev->bd_fsfreeze_mutex);
1336         if (bdev->bd_fsfreeze_count > 0) {
1337                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1338                 error = -EBUSY;
1339                 goto error_bdev;
1340         }
1341         s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1342         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1343         error = PTR_ERR(s);
1344         if (IS_ERR(s))
1345                 goto error_bdev;
1346
1347         memset(&args, 0, sizeof(args));
1348         args.ar_quota = GFS2_QUOTA_DEFAULT;
1349         args.ar_data = GFS2_DATA_DEFAULT;
1350         args.ar_commit = 30;
1351         args.ar_statfs_quantum = 30;
1352         args.ar_quota_quantum = 60;
1353         args.ar_errors = GFS2_ERRORS_DEFAULT;
1354
1355         error = gfs2_mount_args(&args, data);
1356         if (error) {
1357                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1358                 if (s->s_root)
1359                         goto error_super;
1360                 deactivate_locked_super(s);
1361                 return error;
1362         }
1363
1364         if (s->s_root) {
1365                 error = -EBUSY;
1366                 if ((flags ^ s->s_flags) & MS_RDONLY)
1367                         goto error_super;
1368                 close_bdev_exclusive(bdev, mode);
1369         } else {
1370                 char b[BDEVNAME_SIZE];
1371
1372                 s->s_flags = flags;
1373                 s->s_mode = mode;
1374                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1375                 sb_set_blocksize(s, block_size(bdev));
1376                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1377                 if (error) {
1378                         deactivate_locked_super(s);
1379                         return error;
1380                 }
1381                 s->s_flags |= MS_ACTIVE;
1382                 bdev->bd_super = s;
1383         }
1384
1385         sdp = s->s_fs_info;
1386         mnt->mnt_sb = s;
1387         if (args.ar_meta)
1388                 mnt->mnt_root = dget(sdp->sd_master_dir);
1389         else
1390                 mnt->mnt_root = dget(sdp->sd_root_dir);
1391         return 0;
1392
1393 error_super:
1394         deactivate_locked_super(s);
1395 error_bdev:
1396         close_bdev_exclusive(bdev, mode);
1397         return error;
1398 }
1399
1400 static int set_meta_super(struct super_block *s, void *ptr)
1401 {
1402         return -EINVAL;
1403 }
1404
1405 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1406                             const char *dev_name, void *data, struct vfsmount *mnt)
1407 {
1408         struct super_block *s;
1409         struct gfs2_sbd *sdp;
1410         struct path path;
1411         int error;
1412
1413         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1414         if (error) {
1415                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1416                        dev_name, error);
1417                 return error;
1418         }
1419         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1420                  path.dentry->d_inode->i_sb->s_bdev);
1421         path_put(&path);
1422         if (IS_ERR(s)) {
1423                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1424                 return PTR_ERR(s);
1425         }
1426         if ((flags ^ s->s_flags) & MS_RDONLY) {
1427                 deactivate_locked_super(s);
1428                 return -EBUSY;
1429         }
1430         sdp = s->s_fs_info;
1431         mnt->mnt_sb = s;
1432         mnt->mnt_root = dget(sdp->sd_master_dir);
1433         return 0;
1434 }
1435
1436 static void gfs2_kill_sb(struct super_block *sb)
1437 {
1438         struct gfs2_sbd *sdp = sb->s_fs_info;
1439
1440         if (sdp == NULL) {
1441                 kill_block_super(sb);
1442                 return;
1443         }
1444
1445         gfs2_meta_syncfs(sdp);
1446         dput(sdp->sd_root_dir);
1447         dput(sdp->sd_master_dir);
1448         sdp->sd_root_dir = NULL;
1449         sdp->sd_master_dir = NULL;
1450         shrink_dcache_sb(sb);
1451         kill_block_super(sb);
1452         gfs2_delete_debugfs_file(sdp);
1453         kfree(sdp);
1454 }
1455
1456 struct file_system_type gfs2_fs_type = {
1457         .name = "gfs2",
1458         .fs_flags = FS_REQUIRES_DEV,
1459         .get_sb = gfs2_get_sb,
1460         .kill_sb = gfs2_kill_sb,
1461         .owner = THIS_MODULE,
1462 };
1463
1464 struct file_system_type gfs2meta_fs_type = {
1465         .name = "gfs2meta",
1466         .fs_flags = FS_REQUIRES_DEV,
1467         .get_sb = gfs2_get_sb_meta,
1468         .owner = THIS_MODULE,
1469 };
1470