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 */
50 int jfs_umount(struct super_block *sb)
51 {
52 struct address_space *bdev_mapping = sb->s_bdev->bd_inode->i_mapping;
53 struct jfs_sb_info *sbi = JFS_SBI(sb);
54 struct inode *ipbmap = sbi->ipbmap;
55 struct inode *ipimap = sbi->ipimap;
56 struct inode *ipaimap = sbi->ipaimap;
57 struct inode *ipaimap2 = sbi->ipaimap2;
58 struct jfs_log *log;
59 int rc = 0;
60
61 jfs_info("UnMount JFS: sb:0x%p", sb);
62
63 /*
64 * update superblock and close log
65 *
66 * if mounted read-write and log based recovery was enabled
67 */
68 if ((log = sbi->log))
69 /*
70 * Wait for outstanding transactions to be written to log:
71 */
72 jfs_flush_journal(log, 2);
73
74 /*
75 * close fileset inode allocation map (aka fileset inode)
76 */
77 diUnmount(ipimap, 0);
78
79 diFreeSpecial(ipimap);
80 sbi->ipimap = NULL;
81
82 /*
83 * close secondary aggregate inode allocation map
84 */
85 ipaimap2 = sbi->ipaimap2;
86 if (ipaimap2) {
87 diUnmount(ipaimap2, 0);
88 diFreeSpecial(ipaimap2);
89 sbi->ipaimap2 = NULL;
90 }
91
92 /*
93 * close aggregate inode allocation map
94 */
95 ipaimap = sbi->ipaimap;
96 diUnmount(ipaimap, 0);
97 diFreeSpecial(ipaimap);
98 sbi->ipaimap = NULL;
99
100 /*
101 * close aggregate block allocation map
102 */
103 dbUnmount(ipbmap, 0);
104
105 diFreeSpecial(ipbmap);
106 sbi->ipimap = NULL;
107
108 /*
109 * Make sure all metadata makes it to disk before we mark
110 * the superblock as clean
111 */
112 filemap_fdatawrite(bdev_mapping);
113 filemap_fdatawait(bdev_mapping);
114
115 /*
116 * ensure all file system file pages are propagated to their
117 * home blocks on disk (and their in-memory buffer pages are
118 * invalidated) BEFORE updating file system superblock state
119 * (to signify file system is unmounted cleanly, and thus in
120 * consistent state) and log superblock active file system
121 * list (to signify skip logredo()).
122 */
123 if (log) { /* log = NULL if read-only mount */
124 updateSuper(sb, FM_CLEAN);
125
126 /* Restore default gfp_mask for bdev */
127 mapping_set_gfp_mask(bdev_mapping, GFP_USER);
128
129 /*
130 * close log:
131 *
132 * remove file system from log active file system list.
133 */
134 rc = lmLogClose(sb);
135 }
136 jfs_info("UnMount JFS Complete: rc = %d", rc);
137 return rc;
138 }
139
140
141 int jfs_umount_rw(struct super_block *sb)
142 {
143 struct address_space *bdev_mapping = sb->s_bdev->bd_inode->i_mapping;
144 struct jfs_sb_info *sbi = JFS_SBI(sb);
145 struct jfs_log *log = sbi->log;
146
147 if (!log)
148 return 0;
149
150 /*
151 * close log:
152 *
153 * remove file system from log active file system list.
154 */
155 jfs_flush_journal(log, 2);
156
157 /*
158 * Make sure all metadata makes it to disk
159 */
160 dbSync(sbi->ipbmap);
161 diSync(sbi->ipimap);
162
163 /*
164 * Note that we have to do this even if sync_blockdev() will
165 * do exactly the same a few instructions later: We can't
166 * mark the superblock clean before everything is flushed to
167 * disk.
168 */
169 filemap_fdatawrite(bdev_mapping);
170 filemap_fdatawait(bdev_mapping);
171
172 updateSuper(sb, FM_CLEAN);
173
174 /* Restore default gfp_mask for bdev */
175 mapping_set_gfp_mask(bdev_mapping, GFP_USER);
176
177 return lmLogClose(sb);
178 }
179
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