1/*
2 *   Copyright (C) International Business Machines Corp., 2000-2004
3 *
4 *   This program is free software;  you can redistribute it and/or modify
5 *   it under the terms of the GNU General Public License as published by
6 *   the Free Software Foundation; either version 2 of the License, or
7 *   (at your option) any later version.
8 *
9 *   This program is distributed in the hope that it will be useful,
10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 *   the GNU General Public License for more details.
13 *
14 *   You should have received a copy of the GNU General Public License
15 *   along with this program;  if not, write to the Free Software
16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19/*
20 *	jfs_umount.c
21 *
22 * note: file system in transition to aggregate/fileset:
23 * (ref. jfs_mount.c)
24 *
25 * file system unmount is interpreted as mount of the single/only
26 * fileset in the aggregate and, if unmount of the last fileset,
27 * as unmount of the aggerate;
28 */
29
30#include <linux/fs.h>
31#include "jfs_incore.h"
32#include "jfs_filsys.h"
33#include "jfs_superblock.h"
34#include "jfs_dmap.h"
35#include "jfs_imap.h"
36#include "jfs_metapage.h"
37#include "jfs_debug.h"
38
39/*
40 * NAME:	jfs_umount(vfsp, flags, crp)
41 *
42 * FUNCTION:	vfs_umount()
43 *
44 * PARAMETERS:	vfsp	- virtual file system pointer
45 *		flags	- unmount for shutdown
46 *		crp	- credential
47 *
48 * RETURN :	EBUSY	- device has open files
49 */
50int jfs_umount(struct super_block *sb)
51{
52	struct jfs_sb_info *sbi = JFS_SBI(sb);
53	struct inode *ipbmap = sbi->ipbmap;
54	struct inode *ipimap = sbi->ipimap;
55	struct inode *ipaimap = sbi->ipaimap;
56	struct inode *ipaimap2 = sbi->ipaimap2;
57	struct jfs_log *log;
58	int rc = 0;
59
60	jfs_info("UnMount JFS: sb:0x%p", sb);
61
62	/*
63	 *	update superblock and close log
64	 *
65	 * if mounted read-write and log based recovery was enabled
66	 */
67	if ((log = sbi->log))
68		/*
69		 * Wait for outstanding transactions to be written to log:
70		 */
71		jfs_flush_journal(log, 2);
72
73	/*
74	 * close fileset inode allocation map (aka fileset inode)
75	 */
76	diUnmount(ipimap, 0);
77
78	diFreeSpecial(ipimap);
79	sbi->ipimap = NULL;
80
81	/*
82	 * close secondary aggregate inode allocation map
83	 */
84	ipaimap2 = sbi->ipaimap2;
85	if (ipaimap2) {
86		diUnmount(ipaimap2, 0);
87		diFreeSpecial(ipaimap2);
88		sbi->ipaimap2 = NULL;
89	}
90
91	/*
92	 * close aggregate inode allocation map
93	 */
94	ipaimap = sbi->ipaimap;
95	diUnmount(ipaimap, 0);
96	diFreeSpecial(ipaimap);
97	sbi->ipaimap = NULL;
98
99	/*
100	 * close aggregate block allocation map
101	 */
102	dbUnmount(ipbmap, 0);
103
104	diFreeSpecial(ipbmap);
105	sbi->ipimap = NULL;
106
107	/*
108	 * Make sure all metadata makes it to disk before we mark
109	 * the superblock as clean
110	 */
111	filemap_write_and_wait(sbi->direct_inode->i_mapping);
112
113	/*
114	 * ensure all file system file pages are propagated to their
115	 * home blocks on disk (and their in-memory buffer pages are
116	 * invalidated) BEFORE updating file system superblock state
117	 * (to signify file system is unmounted cleanly, and thus in
118	 * consistent state) and log superblock active file system
119	 * list (to signify skip logredo()).
120	 */
121	if (log) {		/* log = NULL if read-only mount */
122		updateSuper(sb, FM_CLEAN);
123
124		/*
125		 * close log:
126		 *
127		 * remove file system from log active file system list.
128		 */
129		rc = lmLogClose(sb);
130	}
131	jfs_info("UnMount JFS Complete: rc = %d", rc);
132	return rc;
133}
134
135
136int jfs_umount_rw(struct super_block *sb)
137{
138	struct jfs_sb_info *sbi = JFS_SBI(sb);
139	struct jfs_log *log = sbi->log;
140
141	if (!log)
142		return 0;
143
144	/*
145	 * close log:
146	 *
147	 * remove file system from log active file system list.
148	 */
149	jfs_flush_journal(log, 2);
150
151	/*
152	 * Make sure all metadata makes it to disk
153	 */
154	dbSync(sbi->ipbmap);
155	diSync(sbi->ipimap);
156
157	/*
158	 * Note that we have to do this even if sync_blockdev() will
159	 * do exactly the same a few instructions later:  We can't
160	 * mark the superblock clean before everything is flushed to
161	 * disk.
162	 */
163	filemap_write_and_wait(sbi->direct_inode->i_mapping);
164
165	updateSuper(sb, FM_CLEAN);
166
167	return lmLogClose(sb);
168}
169