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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/export.h>
18#include <linux/namei.h>
19#include <linux/mount.h>
20#include <linux/gfs2_ondisk.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/**
43 * gfs2_tune_init - Fill a gfs2_tune structure with default values
44 * @gt: tune
45 *
46 */
47
48static void gfs2_tune_init(struct gfs2_tune *gt)
49{
50 spin_lock_init(>->gt_spin);
51
52 gt->gt_quota_simul_sync = 64;
53 gt->gt_quota_warn_period = 10;
54 gt->gt_quota_scale_num = 1;
55 gt->gt_quota_scale_den = 1;
56 gt->gt_new_files_jdata = 0;
57 gt->gt_max_readahead = 1 << 18;
58 gt->gt_complain_secs = 10;
59}
60
61static struct gfs2_sbd *init_sbd(struct super_block *sb)
62{
63 struct gfs2_sbd *sdp;
64
65 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
66 if (!sdp)
67 return NULL;
68
69 sb->s_fs_info = sdp;
70 sdp->sd_vfs = sb;
71 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
72 if (!sdp->sd_lkstats) {
73 kfree(sdp);
74 return NULL;
75 }
76
77 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
78 gfs2_tune_init(&sdp->sd_tune);
79
80 init_waitqueue_head(&sdp->sd_glock_wait);
81 atomic_set(&sdp->sd_glock_disposal, 0);
82 init_completion(&sdp->sd_locking_init);
83 spin_lock_init(&sdp->sd_statfs_spin);
84
85 spin_lock_init(&sdp->sd_rindex_spin);
86 sdp->sd_rindex_tree.rb_node = NULL;
87
88 INIT_LIST_HEAD(&sdp->sd_jindex_list);
89 spin_lock_init(&sdp->sd_jindex_spin);
90 mutex_init(&sdp->sd_jindex_mutex);
91
92 INIT_LIST_HEAD(&sdp->sd_quota_list);
93 mutex_init(&sdp->sd_quota_mutex);
94 init_waitqueue_head(&sdp->sd_quota_wait);
95 INIT_LIST_HEAD(&sdp->sd_trunc_list);
96 spin_lock_init(&sdp->sd_trunc_lock);
97
98 spin_lock_init(&sdp->sd_log_lock);
99 atomic_set(&sdp->sd_log_pinned, 0);
100 INIT_LIST_HEAD(&sdp->sd_log_le_buf);
101 INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
102 INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
103 INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
104
105 init_waitqueue_head(&sdp->sd_log_waitq);
106 init_waitqueue_head(&sdp->sd_logd_waitq);
107 spin_lock_init(&sdp->sd_ail_lock);
108 INIT_LIST_HEAD(&sdp->sd_ail1_list);
109 INIT_LIST_HEAD(&sdp->sd_ail2_list);
110
111 init_rwsem(&sdp->sd_log_flush_lock);
112 atomic_set(&sdp->sd_log_in_flight, 0);
113 init_waitqueue_head(&sdp->sd_log_flush_wait);
114
115 INIT_LIST_HEAD(&sdp->sd_revoke_list);
116
117 mutex_init(&sdp->sd_freeze_lock);
118
119 return sdp;
120}
121
122
123/**
124 * gfs2_check_sb - Check superblock
125 * @sdp: the filesystem
126 * @sb: The superblock
127 * @silent: Don't print a message if the check fails
128 *
129 * Checks the version code of the FS is one that we understand how to
130 * read and that the sizes of the various on-disk structures have not
131 * changed.
132 */
133
134static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
135{
136 struct gfs2_sb_host *sb = &sdp->sd_sb;
137
138 if (sb->sb_magic != GFS2_MAGIC ||
139 sb->sb_type != GFS2_METATYPE_SB) {
140 if (!silent)
141 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
142 return -EINVAL;
143 }
144
145 /* If format numbers match exactly, we're done. */
146
147 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
148 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
149 return 0;
150
151 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
152
153 return -EINVAL;
154}
155
156static void end_bio_io_page(struct bio *bio, int error)
157{
158 struct page *page = bio->bi_private;
159
160 if (!error)
161 SetPageUptodate(page);
162 else
163 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
164 unlock_page(page);
165}
166
167static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
168{
169 struct gfs2_sb_host *sb = &sdp->sd_sb;
170 struct super_block *s = sdp->sd_vfs;
171 const struct gfs2_sb *str = buf;
172
173 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
174 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
175 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
176 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
177 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
178 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
179 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
180 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
181 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
182 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
183 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
184
185 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
186 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
187 memcpy(s->s_uuid, str->sb_uuid, 16);
188}
189
190/**
191 * gfs2_read_super - Read the gfs2 super block from disk
192 * @sdp: The GFS2 super block
193 * @sector: The location of the super block
194 * @error: The error code to return
195 *
196 * This uses the bio functions to read the super block from disk
197 * because we want to be 100% sure that we never read cached data.
198 * A super block is read twice only during each GFS2 mount and is
199 * never written to by the filesystem. The first time its read no
200 * locks are held, and the only details which are looked at are those
201 * relating to the locking protocol. Once locking is up and working,
202 * the sb is read again under the lock to establish the location of
203 * the master directory (contains pointers to journals etc) and the
204 * root directory.
205 *
206 * Returns: 0 on success or error
207 */
208
209static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
210{
211 struct super_block *sb = sdp->sd_vfs;
212 struct gfs2_sb *p;
213 struct page *page;
214 struct bio *bio;
215
216 page = alloc_page(GFP_NOFS);
217 if (unlikely(!page))
218 return -ENOBUFS;
219
220 ClearPageUptodate(page);
221 ClearPageDirty(page);
222 lock_page(page);
223
224 bio = bio_alloc(GFP_NOFS, 1);
225 bio->bi_sector = sector * (sb->s_blocksize >> 9);
226 bio->bi_bdev = sb->s_bdev;
227 bio_add_page(bio, page, PAGE_SIZE, 0);
228
229 bio->bi_end_io = end_bio_io_page;
230 bio->bi_private = page;
231 submit_bio(READ_SYNC | REQ_META, bio);
232 wait_on_page_locked(page);
233 bio_put(bio);
234 if (!PageUptodate(page)) {
235 __free_page(page);
236 return -EIO;
237 }
238 p = kmap(page);
239 gfs2_sb_in(sdp, p);
240 kunmap(page);
241 __free_page(page);
242 return gfs2_check_sb(sdp, silent);
243}
244
245/**
246 * gfs2_read_sb - Read super block
247 * @sdp: The GFS2 superblock
248 * @silent: Don't print message if mount fails
249 *
250 */
251
252static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
253{
254 u32 hash_blocks, ind_blocks, leaf_blocks;
255 u32 tmp_blocks;
256 unsigned int x;
257 int error;
258
259 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
260 if (error) {
261 if (!silent)
262 fs_err(sdp, "can't read superblock\n");
263 return error;
264 }
265
266 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
267 GFS2_BASIC_BLOCK_SHIFT;
268 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
269 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
270 sizeof(struct gfs2_dinode)) / sizeof(u64);
271 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
272 sizeof(struct gfs2_meta_header)) / sizeof(u64);
273 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
274 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
275 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
276 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
277 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
278 sizeof(struct gfs2_meta_header)) /
279 sizeof(struct gfs2_quota_change);
280
281 /* Compute maximum reservation required to add a entry to a directory */
282
283 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
284 sdp->sd_jbsize);
285
286 ind_blocks = 0;
287 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
288 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
289 ind_blocks += tmp_blocks;
290 }
291
292 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
293
294 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
295
296 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
297 sizeof(struct gfs2_dinode);
298 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
299 for (x = 2;; x++) {
300 u64 space, d;
301 u32 m;
302
303 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
304 d = space;
305 m = do_div(d, sdp->sd_inptrs);
306
307 if (d != sdp->sd_heightsize[x - 1] || m)
308 break;
309 sdp->sd_heightsize[x] = space;
310 }
311 sdp->sd_max_height = x;
312 sdp->sd_heightsize[x] = ~0;
313 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
314
315 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
316 sizeof(struct gfs2_dinode);
317 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
318 for (x = 2;; x++) {
319 u64 space, d;
320 u32 m;
321
322 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
323 d = space;
324 m = do_div(d, sdp->sd_inptrs);
325
326 if (d != sdp->sd_jheightsize[x - 1] || m)
327 break;
328 sdp->sd_jheightsize[x] = space;
329 }
330 sdp->sd_max_jheight = x;
331 sdp->sd_jheightsize[x] = ~0;
332 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
333
334 return 0;
335}
336
337static int init_names(struct gfs2_sbd *sdp, int silent)
338{
339 char *proto, *table;
340 int error = 0;
341
342 proto = sdp->sd_args.ar_lockproto;
343 table = sdp->sd_args.ar_locktable;
344
345 /* Try to autodetect */
346
347 if (!proto[0] || !table[0]) {
348 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
349 if (error)
350 return error;
351
352 if (!proto[0])
353 proto = sdp->sd_sb.sb_lockproto;
354 if (!table[0])
355 table = sdp->sd_sb.sb_locktable;
356 }
357
358 if (!table[0])
359 table = sdp->sd_vfs->s_id;
360
361 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
362 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
363
364 table = sdp->sd_table_name;
365 while ((table = strchr(table, '/')))
366 *table = '_';
367
368 return error;
369}
370
371static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
372 int undo)
373{
374 int error = 0;
375
376 if (undo)
377 goto fail_trans;
378
379 error = gfs2_glock_nq_num(sdp,
380 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
381 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
382 mount_gh);
383 if (error) {
384 fs_err(sdp, "can't acquire mount glock: %d\n", error);
385 goto fail;
386 }
387
388 error = gfs2_glock_nq_num(sdp,
389 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
390 LM_ST_SHARED,
391 LM_FLAG_NOEXP | GL_EXACT,
392 &sdp->sd_live_gh);
393 if (error) {
394 fs_err(sdp, "can't acquire live glock: %d\n", error);
395 goto fail_mount;
396 }
397
398 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
399 CREATE, &sdp->sd_rename_gl);
400 if (error) {
401 fs_err(sdp, "can't create rename glock: %d\n", error);
402 goto fail_live;
403 }
404
405 error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
406 CREATE, &sdp->sd_trans_gl);
407 if (error) {
408 fs_err(sdp, "can't create transaction glock: %d\n", error);
409 goto fail_rename;
410 }
411
412 return 0;
413
414fail_trans:
415 gfs2_glock_put(sdp->sd_trans_gl);
416fail_rename:
417 gfs2_glock_put(sdp->sd_rename_gl);
418fail_live:
419 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
420fail_mount:
421 gfs2_glock_dq_uninit(mount_gh);
422fail:
423 return error;
424}
425
426static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
427 u64 no_addr, const char *name)
428{
429 struct gfs2_sbd *sdp = sb->s_fs_info;
430 struct dentry *dentry;
431 struct inode *inode;
432
433 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
434 if (IS_ERR(inode)) {
435 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
436 return PTR_ERR(inode);
437 }
438 dentry = d_make_root(inode);
439 if (!dentry) {
440 fs_err(sdp, "can't alloc %s dentry\n", name);
441 return -ENOMEM;
442 }
443 *dptr = dentry;
444 return 0;
445}
446
447static int init_sb(struct gfs2_sbd *sdp, int silent)
448{
449 struct super_block *sb = sdp->sd_vfs;
450 struct gfs2_holder sb_gh;
451 u64 no_addr;
452 int ret;
453
454 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
455 LM_ST_SHARED, 0, &sb_gh);
456 if (ret) {
457 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
458 return ret;
459 }
460
461 ret = gfs2_read_sb(sdp, silent);
462 if (ret) {
463 fs_err(sdp, "can't read superblock: %d\n", ret);
464 goto out;
465 }
466
467 /* Set up the buffer cache and SB for real */
468 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
469 ret = -EINVAL;
470 fs_err(sdp, "FS block size (%u) is too small for device "
471 "block size (%u)\n",
472 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
473 goto out;
474 }
475 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
476 ret = -EINVAL;
477 fs_err(sdp, "FS block size (%u) is too big for machine "
478 "page size (%u)\n",
479 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
480 goto out;
481 }
482 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
483
484 /* Get the root inode */
485 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
486 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
487 if (ret)
488 goto out;
489
490 /* Get the master inode */
491 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
492 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
493 if (ret) {
494 dput(sdp->sd_root_dir);
495 goto out;
496 }
497 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
498out:
499 gfs2_glock_dq_uninit(&sb_gh);
500 return ret;
501}
502
503/**
504 * map_journal_extents - create a reusable "extent" mapping from all logical
505 * blocks to all physical blocks for the given journal. This will save
506 * us time when writing journal blocks. Most journals will have only one
507 * extent that maps all their logical blocks. That's because gfs2.mkfs
508 * arranges the journal blocks sequentially to maximize performance.
509 * So the extent would map the first block for the entire file length.
510 * However, gfs2_jadd can happen while file activity is happening, so
511 * those journals may not be sequential. Less likely is the case where
512 * the users created their own journals by mounting the metafs and
513 * laying it out. But it's still possible. These journals might have
514 * several extents.
515 *
516 * TODO: This should be done in bigger chunks rather than one block at a time,
517 * but since it's only done at mount time, I'm not worried about the
518 * time it takes.
519 */
520static int map_journal_extents(struct gfs2_sbd *sdp)
521{
522 struct gfs2_jdesc *jd = sdp->sd_jdesc;
523 unsigned int lb;
524 u64 db, prev_db; /* logical block, disk block, prev disk block */
525 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
526 struct gfs2_journal_extent *jext = NULL;
527 struct buffer_head bh;
528 int rc = 0;
529
530 prev_db = 0;
531
532 for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
533 bh.b_state = 0;
534 bh.b_blocknr = 0;
535 bh.b_size = 1 << ip->i_inode.i_blkbits;
536 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
537 db = bh.b_blocknr;
538 if (rc || !db) {
539 printk(KERN_INFO "GFS2 journal mapping error %d: lb="
540 "%u db=%llu\n", rc, lb, (unsigned long long)db);
541 break;
542 }
543 if (!prev_db || db != prev_db + 1) {
544 jext = kzalloc(sizeof(struct gfs2_journal_extent),
545 GFP_KERNEL);
546 if (!jext) {
547 printk(KERN_INFO "GFS2 error: out of memory "
548 "mapping journal extents.\n");
549 rc = -ENOMEM;
550 break;
551 }
552 jext->dblock = db;
553 jext->lblock = lb;
554 jext->blocks = 1;
555 list_add_tail(&jext->extent_list, &jd->extent_list);
556 } else {
557 jext->blocks++;
558 }
559 prev_db = db;
560 }
561 return rc;
562}
563
564static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
565{
566 char *message = "FIRSTMOUNT=Done";
567 char *envp[] = { message, NULL };
568
569 fs_info(sdp, "first mount done, others may mount\n");
570
571 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
572 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
573
574 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
575}
576
577/**
578 * gfs2_jindex_hold - Grab a lock on the jindex
579 * @sdp: The GFS2 superblock
580 * @ji_gh: the holder for the jindex glock
581 *
582 * Returns: errno
583 */
584
585static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
586{
587 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
588 struct qstr name;
589 char buf[20];
590 struct gfs2_jdesc *jd;
591 int error;
592
593 name.name = buf;
594
595 mutex_lock(&sdp->sd_jindex_mutex);
596
597 for (;;) {
598 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
599 if (error)
600 break;
601
602 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
603 name.hash = gfs2_disk_hash(name.name, name.len);
604
605 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
606 if (error == -ENOENT) {
607 error = 0;
608 break;
609 }
610
611 gfs2_glock_dq_uninit(ji_gh);
612
613 if (error)
614 break;
615
616 error = -ENOMEM;
617 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
618 if (!jd)
619 break;
620
621 INIT_LIST_HEAD(&jd->extent_list);
622 INIT_WORK(&jd->jd_work, gfs2_recover_func);
623 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
624 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
625 if (!jd->jd_inode)
626 error = -ENOENT;
627 else
628 error = PTR_ERR(jd->jd_inode);
629 kfree(jd);
630 break;
631 }
632
633 spin_lock(&sdp->sd_jindex_spin);
634 jd->jd_jid = sdp->sd_journals++;
635 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
636 spin_unlock(&sdp->sd_jindex_spin);
637 }
638
639 mutex_unlock(&sdp->sd_jindex_mutex);
640
641 return error;
642}
643
644static int init_journal(struct gfs2_sbd *sdp, int undo)
645{
646 struct inode *master = sdp->sd_master_dir->d_inode;
647 struct gfs2_holder ji_gh;
648 struct gfs2_inode *ip;
649 int jindex = 1;
650 int error = 0;
651
652 if (undo) {
653 jindex = 0;
654 goto fail_jinode_gh;
655 }
656
657 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
658 if (IS_ERR(sdp->sd_jindex)) {
659 fs_err(sdp, "can't lookup journal index: %d\n", error);
660 return PTR_ERR(sdp->sd_jindex);
661 }
662
663 /* Load in the journal index special file */
664
665 error = gfs2_jindex_hold(sdp, &ji_gh);
666 if (error) {
667 fs_err(sdp, "can't read journal index: %d\n", error);
668 goto fail;
669 }
670
671 error = -EUSERS;
672 if (!gfs2_jindex_size(sdp)) {
673 fs_err(sdp, "no journals!\n");
674 goto fail_jindex;
675 }
676
677 if (sdp->sd_args.ar_spectator) {
678 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
679 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
680 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
681 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
682 } else {
683 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
684 fs_err(sdp, "can't mount journal #%u\n",
685 sdp->sd_lockstruct.ls_jid);
686 fs_err(sdp, "there are only %u journals (0 - %u)\n",
687 gfs2_jindex_size(sdp),
688 gfs2_jindex_size(sdp) - 1);
689 goto fail_jindex;
690 }
691 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
692
693 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
694 &gfs2_journal_glops,
695 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
696 &sdp->sd_journal_gh);
697 if (error) {
698 fs_err(sdp, "can't acquire journal glock: %d\n", error);
699 goto fail_jindex;
700 }
701
702 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
703 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
704 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
705 &sdp->sd_jinode_gh);
706 if (error) {
707 fs_err(sdp, "can't acquire journal inode glock: %d\n",
708 error);
709 goto fail_journal_gh;
710 }
711
712 error = gfs2_jdesc_check(sdp->sd_jdesc);
713 if (error) {
714 fs_err(sdp, "my journal (%u) is bad: %d\n",
715 sdp->sd_jdesc->jd_jid, error);
716 goto fail_jinode_gh;
717 }
718 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
719 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
720 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
721
722 /* Map the extents for this journal's blocks */
723 map_journal_extents(sdp);
724 }
725 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
726
727 if (sdp->sd_lockstruct.ls_first) {
728 unsigned int x;
729 for (x = 0; x < sdp->sd_journals; x++) {
730 error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x),
731 true);
732 if (error) {
733 fs_err(sdp, "error recovering journal %u: %d\n",
734 x, error);
735 goto fail_jinode_gh;
736 }
737 }
738
739 gfs2_others_may_mount(sdp);
740 } else if (!sdp->sd_args.ar_spectator) {
741 error = gfs2_recover_journal(sdp->sd_jdesc, true);
742 if (error) {
743 fs_err(sdp, "error recovering my journal: %d\n", error);
744 goto fail_jinode_gh;
745 }
746 }
747
748 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
749 gfs2_glock_dq_uninit(&ji_gh);
750 jindex = 0;
751
752 return 0;
753
754fail_jinode_gh:
755 if (!sdp->sd_args.ar_spectator)
756 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
757fail_journal_gh:
758 if (!sdp->sd_args.ar_spectator)
759 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
760fail_jindex:
761 gfs2_jindex_free(sdp);
762 if (jindex)
763 gfs2_glock_dq_uninit(&ji_gh);
764fail:
765 iput(sdp->sd_jindex);
766 return error;
767}
768
769
770static int init_inodes(struct gfs2_sbd *sdp, int undo)
771{
772 int error = 0;
773 struct inode *master = sdp->sd_master_dir->d_inode;
774
775 if (undo)
776 goto fail_qinode;
777
778 error = init_journal(sdp, undo);
779 if (error)
780 goto fail;
781
782 /* Read in the master statfs inode */
783 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
784 if (IS_ERR(sdp->sd_statfs_inode)) {
785 error = PTR_ERR(sdp->sd_statfs_inode);
786 fs_err(sdp, "can't read in statfs inode: %d\n", error);
787 goto fail_journal;
788 }
789
790 /* Read in the resource index inode */
791 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
792 if (IS_ERR(sdp->sd_rindex)) {
793 error = PTR_ERR(sdp->sd_rindex);
794 fs_err(sdp, "can't get resource index inode: %d\n", error);
795 goto fail_statfs;
796 }
797 sdp->sd_rindex_uptodate = 0;
798
799 /* Read in the quota inode */
800 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
801 if (IS_ERR(sdp->sd_quota_inode)) {
802 error = PTR_ERR(sdp->sd_quota_inode);
803 fs_err(sdp, "can't get quota file inode: %d\n", error);
804 goto fail_rindex;
805 }
806
807 error = gfs2_rindex_update(sdp);
808 if (error)
809 goto fail_qinode;
810
811 return 0;
812
813fail_qinode:
814 iput(sdp->sd_quota_inode);
815fail_rindex:
816 gfs2_clear_rgrpd(sdp);
817 iput(sdp->sd_rindex);
818fail_statfs:
819 iput(sdp->sd_statfs_inode);
820fail_journal:
821 init_journal(sdp, UNDO);
822fail:
823 return error;
824}
825
826static int init_per_node(struct gfs2_sbd *sdp, int undo)
827{
828 struct inode *pn = NULL;
829 char buf[30];
830 int error = 0;
831 struct gfs2_inode *ip;
832 struct inode *master = sdp->sd_master_dir->d_inode;
833
834 if (sdp->sd_args.ar_spectator)
835 return 0;
836
837 if (undo)
838 goto fail_qc_gh;
839
840 pn = gfs2_lookup_simple(master, "per_node");
841 if (IS_ERR(pn)) {
842 error = PTR_ERR(pn);
843 fs_err(sdp, "can't find per_node directory: %d\n", error);
844 return error;
845 }
846
847 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
848 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
849 if (IS_ERR(sdp->sd_sc_inode)) {
850 error = PTR_ERR(sdp->sd_sc_inode);
851 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
852 goto fail;
853 }
854
855 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
856 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
857 if (IS_ERR(sdp->sd_qc_inode)) {
858 error = PTR_ERR(sdp->sd_qc_inode);
859 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
860 goto fail_ut_i;
861 }
862
863 iput(pn);
864 pn = NULL;
865
866 ip = GFS2_I(sdp->sd_sc_inode);
867 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
868 &sdp->sd_sc_gh);
869 if (error) {
870 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
871 goto fail_qc_i;
872 }
873
874 ip = GFS2_I(sdp->sd_qc_inode);
875 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
876 &sdp->sd_qc_gh);
877 if (error) {
878 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
879 goto fail_ut_gh;
880 }
881
882 return 0;
883
884fail_qc_gh:
885 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
886fail_ut_gh:
887 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
888fail_qc_i:
889 iput(sdp->sd_qc_inode);
890fail_ut_i:
891 iput(sdp->sd_sc_inode);
892fail:
893 if (pn)
894 iput(pn);
895 return error;
896}
897
898static int init_threads(struct gfs2_sbd *sdp, int undo)
899{
900 struct task_struct *p;
901 int error = 0;
902
903 if (undo)
904 goto fail_quotad;
905
906 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
907 error = IS_ERR(p);
908 if (error) {
909 fs_err(sdp, "can't start logd thread: %d\n", error);
910 return error;
911 }
912 sdp->sd_logd_process = p;
913
914 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
915 error = IS_ERR(p);
916 if (error) {
917 fs_err(sdp, "can't start quotad thread: %d\n", error);
918 goto fail;
919 }
920 sdp->sd_quotad_process = p;
921
922 return 0;
923
924
925fail_quotad:
926 kthread_stop(sdp->sd_quotad_process);
927fail:
928 kthread_stop(sdp->sd_logd_process);
929 return error;
930}
931
932static const match_table_t nolock_tokens = {
933 { Opt_jid, "jid=%d\n", },
934 { Opt_err, NULL },
935};
936
937static const struct lm_lockops nolock_ops = {
938 .lm_proto_name = "lock_nolock",
939 .lm_put_lock = gfs2_glock_free,
940 .lm_tokens = &nolock_tokens,
941};
942
943/**
944 * gfs2_lm_mount - mount a locking protocol
945 * @sdp: the filesystem
946 * @args: mount arguments
947 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
948 *
949 * Returns: errno
950 */
951
952static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
953{
954 const struct lm_lockops *lm;
955 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
956 struct gfs2_args *args = &sdp->sd_args;
957 const char *proto = sdp->sd_proto_name;
958 const char *table = sdp->sd_table_name;
959 char *o, *options;
960 int ret;
961
962 if (!strcmp("lock_nolock", proto)) {
963 lm = &nolock_ops;
964 sdp->sd_args.ar_localflocks = 1;
965#ifdef CONFIG_GFS2_FS_LOCKING_DLM
966 } else if (!strcmp("lock_dlm", proto)) {
967 lm = &gfs2_dlm_ops;
968#endif
969 } else {
970 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
971 return -ENOENT;
972 }
973
974 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
975
976 ls->ls_ops = lm;
977 ls->ls_first = 1;
978
979 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
980 substring_t tmp[MAX_OPT_ARGS];
981 int token, option;
982
983 if (!o || !*o)
984 continue;
985
986 token = match_token(o, *lm->lm_tokens, tmp);
987 switch (token) {
988 case Opt_jid:
989 ret = match_int(&tmp[0], &option);
990 if (ret || option < 0)
991 goto hostdata_error;
992 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
993 ls->ls_jid = option;
994 break;
995 case Opt_id:
996 case Opt_nodir:
997 /* Obsolete, but left for backward compat purposes */
998 break;
999 case Opt_first:
1000 ret = match_int(&tmp[0], &option);
1001 if (ret || (option != 0 && option != 1))
1002 goto hostdata_error;
1003 ls->ls_first = option;
1004 break;
1005 case Opt_err:
1006 default:
1007hostdata_error:
1008 fs_info(sdp, "unknown hostdata (%s)\n", o);
1009 return -EINVAL;
1010 }
1011 }
1012
1013 if (lm->lm_mount == NULL) {
1014 fs_info(sdp, "Now mounting FS...\n");
1015 complete_all(&sdp->sd_locking_init);
1016 return 0;
1017 }
1018 ret = lm->lm_mount(sdp, table);
1019 if (ret == 0)
1020 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1021 complete_all(&sdp->sd_locking_init);
1022 return ret;
1023}
1024
1025void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1026{
1027 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1028 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1029 lm->lm_unmount)
1030 lm->lm_unmount(sdp);
1031}
1032
1033static int gfs2_journalid_wait(void *word)
1034{
1035 if (signal_pending(current))
1036 return -EINTR;
1037 schedule();
1038 return 0;
1039}
1040
1041static int wait_on_journal(struct gfs2_sbd *sdp)
1042{
1043 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1044 return 0;
1045
1046 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1047}
1048
1049void gfs2_online_uevent(struct gfs2_sbd *sdp)
1050{
1051 struct super_block *sb = sdp->sd_vfs;
1052 char ro[20];
1053 char spectator[20];
1054 char *envp[] = { ro, spectator, NULL };
1055 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1056 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1057 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1058}
1059
1060/**
1061 * fill_super - Read in superblock
1062 * @sb: The VFS superblock
1063 * @data: Mount options
1064 * @silent: Don't complain if it's not a GFS2 filesystem
1065 *
1066 * Returns: errno
1067 */
1068
1069static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1070{
1071 struct gfs2_sbd *sdp;
1072 struct gfs2_holder mount_gh;
1073 int error;
1074
1075 sdp = init_sbd(sb);
1076 if (!sdp) {
1077 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1078 return -ENOMEM;
1079 }
1080 sdp->sd_args = *args;
1081
1082 if (sdp->sd_args.ar_spectator) {
1083 sb->s_flags |= MS_RDONLY;
1084 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1085 }
1086 if (sdp->sd_args.ar_posix_acl)
1087 sb->s_flags |= MS_POSIXACL;
1088 if (sdp->sd_args.ar_nobarrier)
1089 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1090
1091 sb->s_flags |= MS_NOSEC;
1092 sb->s_magic = GFS2_MAGIC;
1093 sb->s_op = &gfs2_super_ops;
1094 sb->s_d_op = &gfs2_dops;
1095 sb->s_export_op = &gfs2_export_ops;
1096 sb->s_xattr = gfs2_xattr_handlers;
1097 sb->s_qcop = &gfs2_quotactl_ops;
1098 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1099 sb->s_time_gran = 1;
1100 sb->s_maxbytes = MAX_LFS_FILESIZE;
1101
1102 /* Set up the buffer cache and fill in some fake block size values
1103 to allow us to read-in the on-disk superblock. */
1104 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1105 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1106 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1107 GFS2_BASIC_BLOCK_SHIFT;
1108 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1109
1110 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1111 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1112 if (sdp->sd_args.ar_statfs_quantum) {
1113 sdp->sd_tune.gt_statfs_slow = 0;
1114 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1115 } else {
1116 sdp->sd_tune.gt_statfs_slow = 1;
1117 sdp->sd_tune.gt_statfs_quantum = 30;
1118 }
1119
1120 error = init_names(sdp, silent);
1121 if (error)
1122 goto fail;
1123
1124 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
1125
1126 gfs2_create_debugfs_file(sdp);
1127
1128 error = gfs2_sys_fs_add(sdp);
1129 if (error)
1130 goto fail;
1131
1132 error = gfs2_lm_mount(sdp, silent);
1133 if (error)
1134 goto fail_sys;
1135
1136 error = init_locking(sdp, &mount_gh, DO);
1137 if (error)
1138 goto fail_lm;
1139
1140 error = init_sb(sdp, silent);
1141 if (error)
1142 goto fail_locking;
1143
1144 error = wait_on_journal(sdp);
1145 if (error)
1146 goto fail_sb;
1147
1148 /*
1149 * If user space has failed to join the cluster or some similar
1150 * failure has occurred, then the journal id will contain a
1151 * negative (error) number. This will then be returned to the
1152 * caller (of the mount syscall). We do this even for spectator
1153 * mounts (which just write a jid of 0 to indicate "ok" even though
1154 * the jid is unused in the spectator case)
1155 */
1156 if (sdp->sd_lockstruct.ls_jid < 0) {
1157 error = sdp->sd_lockstruct.ls_jid;
1158 sdp->sd_lockstruct.ls_jid = 0;
1159 goto fail_sb;
1160 }
1161
1162 if (sdp->sd_args.ar_spectator)
1163 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
1164 sdp->sd_table_name);
1165 else
1166 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
1167 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1168
1169 error = init_inodes(sdp, DO);
1170 if (error)
1171 goto fail_sb;
1172
1173 error = init_per_node(sdp, DO);
1174 if (error)
1175 goto fail_inodes;
1176
1177 error = gfs2_statfs_init(sdp);
1178 if (error) {
1179 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1180 goto fail_per_node;
1181 }
1182
1183 error = init_threads(sdp, DO);
1184 if (error)
1185 goto fail_per_node;
1186
1187 if (!(sb->s_flags & MS_RDONLY)) {
1188 error = gfs2_make_fs_rw(sdp);
1189 if (error) {
1190 fs_err(sdp, "can't make FS RW: %d\n", error);
1191 goto fail_threads;
1192 }
1193 }
1194
1195 gfs2_glock_dq_uninit(&mount_gh);
1196 gfs2_online_uevent(sdp);
1197 return 0;
1198
1199fail_threads:
1200 init_threads(sdp, UNDO);
1201fail_per_node:
1202 init_per_node(sdp, UNDO);
1203fail_inodes:
1204 init_inodes(sdp, UNDO);
1205fail_sb:
1206 if (sdp->sd_root_dir)
1207 dput(sdp->sd_root_dir);
1208 if (sdp->sd_master_dir)
1209 dput(sdp->sd_master_dir);
1210 if (sb->s_root)
1211 dput(sb->s_root);
1212 sb->s_root = NULL;
1213fail_locking:
1214 init_locking(sdp, &mount_gh, UNDO);
1215fail_lm:
1216 gfs2_gl_hash_clear(sdp);
1217 gfs2_lm_unmount(sdp);
1218fail_sys:
1219 gfs2_sys_fs_del(sdp);
1220fail:
1221 gfs2_delete_debugfs_file(sdp);
1222 free_percpu(sdp->sd_lkstats);
1223 kfree(sdp);
1224 sb->s_fs_info = NULL;
1225 return error;
1226}
1227
1228static int set_gfs2_super(struct super_block *s, void *data)
1229{
1230 s->s_bdev = data;
1231 s->s_dev = s->s_bdev->bd_dev;
1232
1233 /*
1234 * We set the bdi here to the queue backing, file systems can
1235 * overwrite this in ->fill_super()
1236 */
1237 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1238 return 0;
1239}
1240
1241static int test_gfs2_super(struct super_block *s, void *ptr)
1242{
1243 struct block_device *bdev = ptr;
1244 return (bdev == s->s_bdev);
1245}
1246
1247/**
1248 * gfs2_mount - Get the GFS2 superblock
1249 * @fs_type: The GFS2 filesystem type
1250 * @flags: Mount flags
1251 * @dev_name: The name of the device
1252 * @data: The mount arguments
1253 *
1254 * Q. Why not use get_sb_bdev() ?
1255 * A. We need to select one of two root directories to mount, independent
1256 * of whether this is the initial, or subsequent, mount of this sb
1257 *
1258 * Returns: 0 or -ve on error
1259 */
1260
1261static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1262 const char *dev_name, void *data)
1263{
1264 struct block_device *bdev;
1265 struct super_block *s;
1266 fmode_t mode = FMODE_READ | FMODE_EXCL;
1267 int error;
1268 struct gfs2_args args;
1269 struct gfs2_sbd *sdp;
1270
1271 if (!(flags & MS_RDONLY))
1272 mode |= FMODE_WRITE;
1273
1274 bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1275 if (IS_ERR(bdev))
1276 return ERR_CAST(bdev);
1277
1278 /*
1279 * once the super is inserted into the list by sget, s_umount
1280 * will protect the lockfs code from trying to start a snapshot
1281 * while we are mounting
1282 */
1283 mutex_lock(&bdev->bd_fsfreeze_mutex);
1284 if (bdev->bd_fsfreeze_count > 0) {
1285 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1286 error = -EBUSY;
1287 goto error_bdev;
1288 }
1289 s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1290 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1291 error = PTR_ERR(s);
1292 if (IS_ERR(s))
1293 goto error_bdev;
1294
1295 if (s->s_root)
1296 blkdev_put(bdev, mode);
1297
1298 memset(&args, 0, sizeof(args));
1299 args.ar_quota = GFS2_QUOTA_DEFAULT;
1300 args.ar_data = GFS2_DATA_DEFAULT;
1301 args.ar_commit = 30;
1302 args.ar_statfs_quantum = 30;
1303 args.ar_quota_quantum = 60;
1304 args.ar_errors = GFS2_ERRORS_DEFAULT;
1305
1306 error = gfs2_mount_args(&args, data);
1307 if (error) {
1308 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1309 goto error_super;
1310 }
1311
1312 if (s->s_root) {
1313 error = -EBUSY;
1314 if ((flags ^ s->s_flags) & MS_RDONLY)
1315 goto error_super;
1316 } else {
1317 char b[BDEVNAME_SIZE];
1318
1319 s->s_flags = flags;
1320 s->s_mode = mode;
1321 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1322 sb_set_blocksize(s, block_size(bdev));
1323 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1324 if (error)
1325 goto error_super;
1326 s->s_flags |= MS_ACTIVE;
1327 bdev->bd_super = s;
1328 }
1329
1330 sdp = s->s_fs_info;
1331 if (args.ar_meta)
1332 return dget(sdp->sd_master_dir);
1333 else
1334 return dget(sdp->sd_root_dir);
1335
1336error_super:
1337 deactivate_locked_super(s);
1338 return ERR_PTR(error);
1339error_bdev:
1340 blkdev_put(bdev, mode);
1341 return ERR_PTR(error);
1342}
1343
1344static int set_meta_super(struct super_block *s, void *ptr)
1345{
1346 return -EINVAL;
1347}
1348
1349static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1350 int flags, const char *dev_name, void *data)
1351{
1352 struct super_block *s;
1353 struct gfs2_sbd *sdp;
1354 struct path path;
1355 int error;
1356
1357 error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1358 if (error) {
1359 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1360 dev_name, error);
1361 return ERR_PTR(error);
1362 }
1363 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1364 path.dentry->d_inode->i_sb->s_bdev);
1365 path_put(&path);
1366 if (IS_ERR(s)) {
1367 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1368 return ERR_CAST(s);
1369 }
1370 if ((flags ^ s->s_flags) & MS_RDONLY) {
1371 deactivate_locked_super(s);
1372 return ERR_PTR(-EBUSY);
1373 }
1374 sdp = s->s_fs_info;
1375 return dget(sdp->sd_master_dir);
1376}
1377
1378static void gfs2_kill_sb(struct super_block *sb)
1379{
1380 struct gfs2_sbd *sdp = sb->s_fs_info;
1381
1382 if (sdp == NULL) {
1383 kill_block_super(sb);
1384 return;
1385 }
1386
1387 gfs2_meta_syncfs(sdp);
1388 dput(sdp->sd_root_dir);
1389 dput(sdp->sd_master_dir);
1390 sdp->sd_root_dir = NULL;
1391 sdp->sd_master_dir = NULL;
1392 shrink_dcache_sb(sb);
1393 kill_block_super(sb);
1394 gfs2_delete_debugfs_file(sdp);
1395 free_percpu(sdp->sd_lkstats);
1396 kfree(sdp);
1397}
1398
1399struct file_system_type gfs2_fs_type = {
1400 .name = "gfs2",
1401 .fs_flags = FS_REQUIRES_DEV,
1402 .mount = gfs2_mount,
1403 .kill_sb = gfs2_kill_sb,
1404 .owner = THIS_MODULE,
1405};
1406
1407struct file_system_type gfs2meta_fs_type = {
1408 .name = "gfs2meta",
1409 .fs_flags = FS_REQUIRES_DEV,
1410 .mount = gfs2_mount_meta,
1411 .owner = THIS_MODULE,
1412};
1413