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/linux-2.6.21.x/fs/gfs2/ops_fstype.c

https://bitbucket.org/altlc/wive-rtnl-ralink-rt305x-routers-firmware-amod
C | 925 lines | 753 code | 143 blank | 29 comment | 95 complexity | 92191734fe4c24ab071eb850462253cd MD5 | raw file
  1/*
  2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3 * Copyright (C) 2004-2006 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/lm_interface.h>
 21
 22#include "gfs2.h"
 23#include "incore.h"
 24#include "daemon.h"
 25#include "glock.h"
 26#include "glops.h"
 27#include "inode.h"
 28#include "lm.h"
 29#include "mount.h"
 30#include "ops_export.h"
 31#include "ops_fstype.h"
 32#include "ops_super.h"
 33#include "recovery.h"
 34#include "rgrp.h"
 35#include "super.h"
 36#include "sys.h"
 37#include "util.h"
 38
 39#define DO 0
 40#define UNDO 1
 41
 42extern struct dentry_operations gfs2_dops;
 43
 44static struct gfs2_sbd *init_sbd(struct super_block *sb)
 45{
 46	struct gfs2_sbd *sdp;
 47
 48	sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
 49	if (!sdp)
 50		return NULL;
 51
 52	sb->s_fs_info = sdp;
 53	sdp->sd_vfs = sb;
 54
 55	gfs2_tune_init(&sdp->sd_tune);
 56
 57	INIT_LIST_HEAD(&sdp->sd_reclaim_list);
 58	spin_lock_init(&sdp->sd_reclaim_lock);
 59	init_waitqueue_head(&sdp->sd_reclaim_wq);
 60
 61	mutex_init(&sdp->sd_inum_mutex);
 62	spin_lock_init(&sdp->sd_statfs_spin);
 63	mutex_init(&sdp->sd_statfs_mutex);
 64
 65	spin_lock_init(&sdp->sd_rindex_spin);
 66	mutex_init(&sdp->sd_rindex_mutex);
 67	INIT_LIST_HEAD(&sdp->sd_rindex_list);
 68	INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
 69	INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
 70
 71	INIT_LIST_HEAD(&sdp->sd_jindex_list);
 72	spin_lock_init(&sdp->sd_jindex_spin);
 73	mutex_init(&sdp->sd_jindex_mutex);
 74
 75	INIT_LIST_HEAD(&sdp->sd_quota_list);
 76	spin_lock_init(&sdp->sd_quota_spin);
 77	mutex_init(&sdp->sd_quota_mutex);
 78
 79	spin_lock_init(&sdp->sd_log_lock);
 80
 81	INIT_LIST_HEAD(&sdp->sd_log_le_gl);
 82	INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 83	INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 84	INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 85	INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 86
 87	mutex_init(&sdp->sd_log_reserve_mutex);
 88	INIT_LIST_HEAD(&sdp->sd_ail1_list);
 89	INIT_LIST_HEAD(&sdp->sd_ail2_list);
 90
 91	init_rwsem(&sdp->sd_log_flush_lock);
 92	INIT_LIST_HEAD(&sdp->sd_log_flush_list);
 93
 94	INIT_LIST_HEAD(&sdp->sd_revoke_list);
 95
 96	mutex_init(&sdp->sd_freeze_lock);
 97
 98	return sdp;
 99}
100
101static void init_vfs(struct super_block *sb, unsigned noatime)
102{
103	struct gfs2_sbd *sdp = sb->s_fs_info;
104
105	sb->s_magic = GFS2_MAGIC;
106	sb->s_op = &gfs2_super_ops;
107	sb->s_export_op = &gfs2_export_ops;
108	sb->s_maxbytes = MAX_LFS_FILESIZE;
109
110	if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
111		set_bit(noatime, &sdp->sd_flags);
112
113	/* Don't let the VFS update atimes.  GFS2 handles this itself. */
114	sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
115}
116
117static int init_names(struct gfs2_sbd *sdp, int silent)
118{
119	struct page *page;
120	char *proto, *table;
121	int error = 0;
122
123	proto = sdp->sd_args.ar_lockproto;
124	table = sdp->sd_args.ar_locktable;
125
126	/*  Try to autodetect  */
127
128	if (!proto[0] || !table[0]) {
129		struct gfs2_sb *sb;
130		page = gfs2_read_super(sdp->sd_vfs, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
131		if (!page)
132			return -ENOBUFS;
133		sb = kmap(page);
134		gfs2_sb_in(&sdp->sd_sb, sb);
135		kunmap(page);
136		__free_page(page);
137
138		error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
139		if (error)
140			goto out;
141
142		if (!proto[0])
143			proto = sdp->sd_sb.sb_lockproto;
144		if (!table[0])
145			table = sdp->sd_sb.sb_locktable;
146	}
147
148	if (!table[0])
149		table = sdp->sd_vfs->s_id;
150
151	snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
152	snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
153
154out:
155	return error;
156}
157
158static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
159			int undo)
160{
161	struct task_struct *p;
162	int error = 0;
163
164	if (undo)
165		goto fail_trans;
166
167	p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
168	error = IS_ERR(p);
169	if (error) {
170		fs_err(sdp, "can't start scand thread: %d\n", error);
171		return error;
172	}
173	sdp->sd_scand_process = p;
174
175	for (sdp->sd_glockd_num = 0;
176	     sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
177	     sdp->sd_glockd_num++) {
178		p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
179		error = IS_ERR(p);
180		if (error) {
181			fs_err(sdp, "can't start glockd thread: %d\n", error);
182			goto fail;
183		}
184		sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
185	}
186
187	error = gfs2_glock_nq_num(sdp,
188				  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
189				  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
190				  mount_gh);
191	if (error) {
192		fs_err(sdp, "can't acquire mount glock: %d\n", error);
193		goto fail;
194	}
195
196	error = gfs2_glock_nq_num(sdp,
197				  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
198				  LM_ST_SHARED,
199				  LM_FLAG_NOEXP | GL_EXACT,
200				  &sdp->sd_live_gh);
201	if (error) {
202		fs_err(sdp, "can't acquire live glock: %d\n", error);
203		goto fail_mount;
204	}
205
206	error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
207			       CREATE, &sdp->sd_rename_gl);
208	if (error) {
209		fs_err(sdp, "can't create rename glock: %d\n", error);
210		goto fail_live;
211	}
212
213	error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
214			       CREATE, &sdp->sd_trans_gl);
215	if (error) {
216		fs_err(sdp, "can't create transaction glock: %d\n", error);
217		goto fail_rename;
218	}
219	set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
220
221	return 0;
222
223fail_trans:
224	gfs2_glock_put(sdp->sd_trans_gl);
225fail_rename:
226	gfs2_glock_put(sdp->sd_rename_gl);
227fail_live:
228	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
229fail_mount:
230	gfs2_glock_dq_uninit(mount_gh);
231fail:
232	while (sdp->sd_glockd_num--)
233		kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
234
235	kthread_stop(sdp->sd_scand_process);
236	return error;
237}
238
239static struct inode *gfs2_lookup_root(struct super_block *sb,
240				      struct gfs2_inum_host *inum)
241{
242	return gfs2_inode_lookup(sb, inum, DT_DIR);
243}
244
245static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
246{
247	struct super_block *sb = sdp->sd_vfs;
248	struct gfs2_holder sb_gh;
249	struct gfs2_inum_host *inum;
250	struct inode *inode;
251	int error = 0;
252
253	if (undo) {
254		if (sb->s_root) {
255			dput(sb->s_root);
256			sb->s_root = NULL;
257		}
258		return 0;
259	}
260
261	error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
262				 LM_ST_SHARED, 0, &sb_gh);
263	if (error) {
264		fs_err(sdp, "can't acquire superblock glock: %d\n", error);
265		return error;
266	}
267
268	error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
269	if (error) {
270		fs_err(sdp, "can't read superblock: %d\n", error);
271		goto out;
272	}
273
274	/* Set up the buffer cache and SB for real */
275	if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
276		error = -EINVAL;
277		fs_err(sdp, "FS block size (%u) is too small for device "
278		       "block size (%u)\n",
279		       sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
280		goto out;
281	}
282	if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
283		error = -EINVAL;
284		fs_err(sdp, "FS block size (%u) is too big for machine "
285		       "page size (%u)\n",
286		       sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
287		goto out;
288	}
289	sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
290
291	/* Get the root inode */
292	inum = &sdp->sd_sb.sb_root_dir;
293	if (sb->s_type == &gfs2meta_fs_type)
294		inum = &sdp->sd_sb.sb_master_dir;
295	inode = gfs2_lookup_root(sb, inum);
296	if (IS_ERR(inode)) {
297		error = PTR_ERR(inode);
298		fs_err(sdp, "can't read in root inode: %d\n", error);
299		goto out;
300	}
301
302	sb->s_root = d_alloc_root(inode);
303	if (!sb->s_root) {
304		fs_err(sdp, "can't get root dentry\n");
305		error = -ENOMEM;
306		iput(inode);
307	}
308	sb->s_root->d_op = &gfs2_dops;
309out:
310	gfs2_glock_dq_uninit(&sb_gh);
311	return error;
312}
313
314static int init_journal(struct gfs2_sbd *sdp, int undo)
315{
316	struct gfs2_holder ji_gh;
317	struct task_struct *p;
318	struct gfs2_inode *ip;
319	int jindex = 1;
320	int error = 0;
321
322	if (undo) {
323		jindex = 0;
324		goto fail_recoverd;
325	}
326
327	sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
328	if (IS_ERR(sdp->sd_jindex)) {
329		fs_err(sdp, "can't lookup journal index: %d\n", error);
330		return PTR_ERR(sdp->sd_jindex);
331	}
332	ip = GFS2_I(sdp->sd_jindex);
333	set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
334
335	/* Load in the journal index special file */
336
337	error = gfs2_jindex_hold(sdp, &ji_gh);
338	if (error) {
339		fs_err(sdp, "can't read journal index: %d\n", error);
340		goto fail;
341	}
342
343	error = -EINVAL;
344	if (!gfs2_jindex_size(sdp)) {
345		fs_err(sdp, "no journals!\n");
346		goto fail_jindex;
347	}
348
349	if (sdp->sd_args.ar_spectator) {
350		sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
351		sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
352	} else {
353		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
354			fs_err(sdp, "can't mount journal #%u\n",
355			       sdp->sd_lockstruct.ls_jid);
356			fs_err(sdp, "there are only %u journals (0 - %u)\n",
357			       gfs2_jindex_size(sdp),
358			       gfs2_jindex_size(sdp) - 1);
359			goto fail_jindex;
360		}
361		sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
362
363		error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
364					  &gfs2_journal_glops,
365					  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
366					  &sdp->sd_journal_gh);
367		if (error) {
368			fs_err(sdp, "can't acquire journal glock: %d\n", error);
369			goto fail_jindex;
370		}
371
372		ip = GFS2_I(sdp->sd_jdesc->jd_inode);
373		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
374					   LM_FLAG_NOEXP | GL_EXACT,
375					   &sdp->sd_jinode_gh);
376		if (error) {
377			fs_err(sdp, "can't acquire journal inode glock: %d\n",
378			       error);
379			goto fail_journal_gh;
380		}
381
382		error = gfs2_jdesc_check(sdp->sd_jdesc);
383		if (error) {
384			fs_err(sdp, "my journal (%u) is bad: %d\n",
385			       sdp->sd_jdesc->jd_jid, error);
386			goto fail_jinode_gh;
387		}
388		sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
389	}
390
391	if (sdp->sd_lockstruct.ls_first) {
392		unsigned int x;
393		for (x = 0; x < sdp->sd_journals; x++) {
394			error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
395			if (error) {
396				fs_err(sdp, "error recovering journal %u: %d\n",
397				       x, error);
398				goto fail_jinode_gh;
399			}
400		}
401
402		gfs2_lm_others_may_mount(sdp);
403	} else if (!sdp->sd_args.ar_spectator) {
404		error = gfs2_recover_journal(sdp->sd_jdesc);
405		if (error) {
406			fs_err(sdp, "error recovering my journal: %d\n", error);
407			goto fail_jinode_gh;
408		}
409	}
410
411	set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
412	gfs2_glock_dq_uninit(&ji_gh);
413	jindex = 0;
414
415	p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
416	error = IS_ERR(p);
417	if (error) {
418		fs_err(sdp, "can't start recoverd thread: %d\n", error);
419		goto fail_jinode_gh;
420	}
421	sdp->sd_recoverd_process = p;
422
423	return 0;
424
425fail_recoverd:
426	kthread_stop(sdp->sd_recoverd_process);
427fail_jinode_gh:
428	if (!sdp->sd_args.ar_spectator)
429		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
430fail_journal_gh:
431	if (!sdp->sd_args.ar_spectator)
432		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
433fail_jindex:
434	gfs2_jindex_free(sdp);
435	if (jindex)
436		gfs2_glock_dq_uninit(&ji_gh);
437fail:
438	iput(sdp->sd_jindex);
439	return error;
440}
441
442
443static int init_inodes(struct gfs2_sbd *sdp, int undo)
444{
445	int error = 0;
446	struct gfs2_inode *ip;
447	struct inode *inode;
448
449	if (undo)
450		goto fail_qinode;
451
452	inode = gfs2_lookup_root(sdp->sd_vfs, &sdp->sd_sb.sb_master_dir);
453	if (IS_ERR(inode)) {
454		error = PTR_ERR(inode);
455		fs_err(sdp, "can't read in master directory: %d\n", error);
456		goto fail;
457	}
458	sdp->sd_master_dir = inode;
459
460	error = init_journal(sdp, undo);
461	if (error)
462		goto fail_master;
463
464	/* Read in the master inode number inode */
465	sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
466	if (IS_ERR(sdp->sd_inum_inode)) {
467		error = PTR_ERR(sdp->sd_inum_inode);
468		fs_err(sdp, "can't read in inum inode: %d\n", error);
469		goto fail_journal;
470	}
471
472
473	/* Read in the master statfs inode */
474	sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
475	if (IS_ERR(sdp->sd_statfs_inode)) {
476		error = PTR_ERR(sdp->sd_statfs_inode);
477		fs_err(sdp, "can't read in statfs inode: %d\n", error);
478		goto fail_inum;
479	}
480
481	/* Read in the resource index inode */
482	sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
483	if (IS_ERR(sdp->sd_rindex)) {
484		error = PTR_ERR(sdp->sd_rindex);
485		fs_err(sdp, "can't get resource index inode: %d\n", error);
486		goto fail_statfs;
487	}
488	ip = GFS2_I(sdp->sd_rindex);
489	set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
490	sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
491
492	/* Read in the quota inode */
493	sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
494	if (IS_ERR(sdp->sd_quota_inode)) {
495		error = PTR_ERR(sdp->sd_quota_inode);
496		fs_err(sdp, "can't get quota file inode: %d\n", error);
497		goto fail_rindex;
498	}
499	return 0;
500
501fail_qinode:
502	iput(sdp->sd_quota_inode);
503fail_rindex:
504	gfs2_clear_rgrpd(sdp);
505	iput(sdp->sd_rindex);
506fail_statfs:
507	iput(sdp->sd_statfs_inode);
508fail_inum:
509	iput(sdp->sd_inum_inode);
510fail_journal:
511	init_journal(sdp, UNDO);
512fail_master:
513	iput(sdp->sd_master_dir);
514fail:
515	return error;
516}
517
518static int init_per_node(struct gfs2_sbd *sdp, int undo)
519{
520	struct inode *pn = NULL;
521	char buf[30];
522	int error = 0;
523	struct gfs2_inode *ip;
524
525	if (sdp->sd_args.ar_spectator)
526		return 0;
527
528	if (undo)
529		goto fail_qc_gh;
530
531	pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
532	if (IS_ERR(pn)) {
533		error = PTR_ERR(pn);
534		fs_err(sdp, "can't find per_node directory: %d\n", error);
535		return error;
536	}
537
538	sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
539	sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
540	if (IS_ERR(sdp->sd_ir_inode)) {
541		error = PTR_ERR(sdp->sd_ir_inode);
542		fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
543		goto fail;
544	}
545
546	sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
547	sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
548	if (IS_ERR(sdp->sd_sc_inode)) {
549		error = PTR_ERR(sdp->sd_sc_inode);
550		fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
551		goto fail_ir_i;
552	}
553
554	sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
555	sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
556	if (IS_ERR(sdp->sd_qc_inode)) {
557		error = PTR_ERR(sdp->sd_qc_inode);
558		fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
559		goto fail_ut_i;
560	}
561
562	iput(pn);
563	pn = NULL;
564
565	ip = GFS2_I(sdp->sd_ir_inode);
566	error = gfs2_glock_nq_init(ip->i_gl,
567				   LM_ST_EXCLUSIVE, 0,
568				   &sdp->sd_ir_gh);
569	if (error) {
570		fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
571		goto fail_qc_i;
572	}
573
574	ip = GFS2_I(sdp->sd_sc_inode);
575	error = gfs2_glock_nq_init(ip->i_gl,
576				   LM_ST_EXCLUSIVE, 0,
577				   &sdp->sd_sc_gh);
578	if (error) {
579		fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
580		goto fail_ir_gh;
581	}
582
583	ip = GFS2_I(sdp->sd_qc_inode);
584	error = gfs2_glock_nq_init(ip->i_gl,
585				   LM_ST_EXCLUSIVE, 0,
586				   &sdp->sd_qc_gh);
587	if (error) {
588		fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
589		goto fail_ut_gh;
590	}
591
592	return 0;
593
594fail_qc_gh:
595	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
596fail_ut_gh:
597	gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
598fail_ir_gh:
599	gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
600fail_qc_i:
601	iput(sdp->sd_qc_inode);
602fail_ut_i:
603	iput(sdp->sd_sc_inode);
604fail_ir_i:
605	iput(sdp->sd_ir_inode);
606fail:
607	if (pn)
608		iput(pn);
609	return error;
610}
611
612static int init_threads(struct gfs2_sbd *sdp, int undo)
613{
614	struct task_struct *p;
615	int error = 0;
616
617	if (undo)
618		goto fail_quotad;
619
620	sdp->sd_log_flush_time = jiffies;
621	sdp->sd_jindex_refresh_time = jiffies;
622
623	p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
624	error = IS_ERR(p);
625	if (error) {
626		fs_err(sdp, "can't start logd thread: %d\n", error);
627		return error;
628	}
629	sdp->sd_logd_process = p;
630
631	sdp->sd_statfs_sync_time = jiffies;
632	sdp->sd_quota_sync_time = jiffies;
633
634	p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
635	error = IS_ERR(p);
636	if (error) {
637		fs_err(sdp, "can't start quotad thread: %d\n", error);
638		goto fail;
639	}
640	sdp->sd_quotad_process = p;
641
642	return 0;
643
644
645fail_quotad:
646	kthread_stop(sdp->sd_quotad_process);
647fail:
648	kthread_stop(sdp->sd_logd_process);
649	return error;
650}
651
652/**
653 * fill_super - Read in superblock
654 * @sb: The VFS superblock
655 * @data: Mount options
656 * @silent: Don't complain if it's not a GFS2 filesystem
657 *
658 * Returns: errno
659 */
660
661static int fill_super(struct super_block *sb, void *data, int silent)
662{
663	struct gfs2_sbd *sdp;
664	struct gfs2_holder mount_gh;
665	int error;
666
667	sdp = init_sbd(sb);
668	if (!sdp) {
669		printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
670		return -ENOMEM;
671	}
672
673	error = gfs2_mount_args(sdp, (char *)data, 0);
674	if (error) {
675		printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
676		goto fail;
677	}
678
679	init_vfs(sb, SDF_NOATIME);
680
681	/* Set up the buffer cache and fill in some fake block size values
682	   to allow us to read-in the on-disk superblock. */
683	sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
684	sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
685	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
686                               GFS2_BASIC_BLOCK_SHIFT;
687	sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
688
689	error = init_names(sdp, silent);
690	if (error)
691		goto fail;
692
693	error = gfs2_sys_fs_add(sdp);
694	if (error)
695		goto fail;
696
697	error = gfs2_lm_mount(sdp, silent);
698	if (error)
699		goto fail_sys;
700
701	error = init_locking(sdp, &mount_gh, DO);
702	if (error)
703		goto fail_lm;
704
705	error = init_sb(sdp, silent, DO);
706	if (error)
707		goto fail_locking;
708
709	error = init_inodes(sdp, DO);
710	if (error)
711		goto fail_sb;
712
713	error = init_per_node(sdp, DO);
714	if (error)
715		goto fail_inodes;
716
717	error = gfs2_statfs_init(sdp);
718	if (error) {
719		fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
720		goto fail_per_node;
721	}
722
723	error = init_threads(sdp, DO);
724	if (error)
725		goto fail_per_node;
726
727	if (!(sb->s_flags & MS_RDONLY)) {
728		error = gfs2_make_fs_rw(sdp);
729		if (error) {
730			fs_err(sdp, "can't make FS RW: %d\n", error);
731			goto fail_threads;
732		}
733	}
734
735	gfs2_glock_dq_uninit(&mount_gh);
736
737	return 0;
738
739fail_threads:
740	init_threads(sdp, UNDO);
741fail_per_node:
742	init_per_node(sdp, UNDO);
743fail_inodes:
744	init_inodes(sdp, UNDO);
745fail_sb:
746	init_sb(sdp, 0, UNDO);
747fail_locking:
748	init_locking(sdp, &mount_gh, UNDO);
749fail_lm:
750	gfs2_gl_hash_clear(sdp, WAIT);
751	gfs2_lm_unmount(sdp);
752	while (invalidate_inodes(sb))
753		yield();
754fail_sys:
755	gfs2_sys_fs_del(sdp);
756fail:
757	kfree(sdp);
758	sb->s_fs_info = NULL;
759	return error;
760}
761
762static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
763		const char *dev_name, void *data, struct vfsmount *mnt)
764{
765	struct super_block *sb;
766	struct gfs2_sbd *sdp;
767	int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
768	if (error)
769		goto out;
770	sb = mnt->mnt_sb;
771	sdp = sb->s_fs_info;
772	sdp->sd_gfs2mnt = mnt;
773out:
774	return error;
775}
776
777static int fill_super_meta(struct super_block *sb, struct super_block *new,
778			   void *data, int silent)
779{
780	struct gfs2_sbd *sdp = sb->s_fs_info;
781	struct inode *inode;
782	int error = 0;
783
784	new->s_fs_info = sdp;
785	sdp->sd_vfs_meta = sb;
786
787	init_vfs(new, SDF_NOATIME);
788
789        /* Get the master inode */
790	inode = igrab(sdp->sd_master_dir);
791
792	new->s_root = d_alloc_root(inode);
793	if (!new->s_root) {
794		fs_err(sdp, "can't get root dentry\n");
795		error = -ENOMEM;
796		iput(inode);
797	} else
798		new->s_root->d_op = &gfs2_dops;
799
800	return error;
801}
802
803static int set_bdev_super(struct super_block *s, void *data)
804{
805	s->s_bdev = data;
806	s->s_dev = s->s_bdev->bd_dev;
807	return 0;
808}
809
810static int test_bdev_super(struct super_block *s, void *data)
811{
812	return s->s_bdev == data;
813}
814
815static struct super_block* get_gfs2_sb(const char *dev_name)
816{
817	struct kstat stat;
818	struct nameidata nd;
819	struct file_system_type *fstype;
820	struct super_block *sb = NULL, *s;
821	struct list_head *l;
822	int error;
823
824	error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
825	if (error) {
826		printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
827		       dev_name);
828		goto out;
829	}
830	error = vfs_getattr(nd.mnt, nd.dentry, &stat);
831
832	fstype = get_fs_type("gfs2");
833	list_for_each(l, &fstype->fs_supers) {
834		s = list_entry(l, struct super_block, s_instances);
835		if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
836		    (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
837			sb = s;
838			goto free_nd;
839		}
840	}
841
842	printk(KERN_WARNING "GFS2: Unrecognized block device or "
843	       "mount point %s\n", dev_name);
844
845free_nd:
846	path_release(&nd);
847out:
848	return sb;
849}
850
851static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
852			    const char *dev_name, void *data, struct vfsmount *mnt)
853{
854	int error = 0;
855	struct super_block *sb = NULL, *new;
856	struct gfs2_sbd *sdp;
857
858	sb = get_gfs2_sb(dev_name);
859	if (!sb) {
860		printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
861		error = -ENOENT;
862		goto error;
863	}
864	sdp = (struct gfs2_sbd*) sb->s_fs_info;
865	if (sdp->sd_vfs_meta) {
866		printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
867		error = -EBUSY;
868		goto error;
869	}
870	down(&sb->s_bdev->bd_mount_sem);
871	new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
872	up(&sb->s_bdev->bd_mount_sem);
873	if (IS_ERR(new)) {
874		error = PTR_ERR(new);
875		goto error;
876	}
877	module_put(fs_type->owner);
878	new->s_flags = flags;
879	strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
880	sb_set_blocksize(new, sb->s_blocksize);
881	error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
882	if (error) {
883		up_write(&new->s_umount);
884		deactivate_super(new);
885		goto error;
886	}
887
888	new->s_flags |= MS_ACTIVE;
889
890	/* Grab a reference to the gfs2 mount point */
891	atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
892	return simple_set_mnt(mnt, new);
893error:
894	return error;
895}
896
897static void gfs2_kill_sb(struct super_block *sb)
898{
899	kill_block_super(sb);
900}
901
902static void gfs2_kill_sb_meta(struct super_block *sb)
903{
904	struct gfs2_sbd *sdp = sb->s_fs_info;
905	generic_shutdown_super(sb);
906	sdp->sd_vfs_meta = NULL;
907	atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
908}
909
910struct file_system_type gfs2_fs_type = {
911	.name = "gfs2",
912	.fs_flags = FS_REQUIRES_DEV,
913	.get_sb = gfs2_get_sb,
914	.kill_sb = gfs2_kill_sb,
915	.owner = THIS_MODULE,
916};
917
918struct file_system_type gfs2meta_fs_type = {
919	.name = "gfs2meta",
920	.fs_flags = FS_REQUIRES_DEV,
921	.get_sb = gfs2_get_sb_meta,
922	.kill_sb = gfs2_kill_sb_meta,
923	.owner = THIS_MODULE,
924};
925