ia64/linux-2.6.18-xen.hg

view fs/jfs/jfs_umount.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
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 */
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 */
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"
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 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;
60 jfs_info("UnMount JFS: sb:0x%p", sb);
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);
73 /*
74 * close fileset inode allocation map (aka fileset inode)
75 */
76 diUnmount(ipimap, 0);
78 diFreeSpecial(ipimap);
79 sbi->ipimap = NULL;
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 }
91 /*
92 * close aggregate inode allocation map
93 */
94 ipaimap = sbi->ipaimap;
95 diUnmount(ipaimap, 0);
96 diFreeSpecial(ipaimap);
97 sbi->ipaimap = NULL;
99 /*
100 * close aggregate block allocation map
101 */
102 dbUnmount(ipbmap, 0);
104 diFreeSpecial(ipbmap);
105 sbi->ipimap = NULL;
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);
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);
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 }
136 int jfs_umount_rw(struct super_block *sb)
137 {
138 struct jfs_sb_info *sbi = JFS_SBI(sb);
139 struct jfs_log *log = sbi->log;
141 if (!log)
142 return 0;
144 /*
145 * close log:
146 *
147 * remove file system from log active file system list.
148 */
149 jfs_flush_journal(log, 2);
151 /*
152 * Make sure all metadata makes it to disk
153 */
154 dbSync(sbi->ipbmap);
155 diSync(sbi->ipimap);
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);
165 updateSuper(sb, FM_CLEAN);
167 return lmLogClose(sb);
168 }