Root/fs/jfs/jfs_umount.c

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, 1);
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, 1);
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

Archive Download this file



interactive