1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) International Business Machines Corp., 2000-2004
4 */
5
6 /*
7 * jfs_umount.c
8 *
9 * note: file system in transition to aggregate/fileset:
10 * (ref. jfs_mount.c)
11 *
12 * file system unmount is interpreted as mount of the single/only
13 * fileset in the aggregate and, if unmount of the last fileset,
14 * as unmount of the aggerate;
15 */
16
17 #include <linux/fs.h>
18 #include "jfs_incore.h"
19 #include "jfs_filsys.h"
20 #include "jfs_superblock.h"
21 #include "jfs_dmap.h"
22 #include "jfs_imap.h"
23 #include "jfs_metapage.h"
24 #include "jfs_debug.h"
25
26 /*
27 * NAME: jfs_umount(vfsp, flags, crp)
28 *
29 * FUNCTION: vfs_umount()
30 *
31 * PARAMETERS: vfsp - virtual file system pointer
32 * flags - unmount for shutdown
33 * crp - credential
34 *
35 * RETURN : EBUSY - device has open files
36 */
jfs_umount(struct super_block * sb)37 int jfs_umount(struct super_block *sb)
38 {
39 struct jfs_sb_info *sbi = JFS_SBI(sb);
40 struct inode *ipbmap = sbi->ipbmap;
41 struct inode *ipimap = sbi->ipimap;
42 struct inode *ipaimap = sbi->ipaimap;
43 struct inode *ipaimap2 = sbi->ipaimap2;
44 struct jfs_log *log;
45 int rc = 0;
46
47 jfs_info("UnMount JFS: sb:0x%p", sb);
48
49 /*
50 * update superblock and close log
51 *
52 * if mounted read-write and log based recovery was enabled
53 */
54 if ((log = sbi->log))
55 /*
56 * Wait for outstanding transactions to be written to log:
57 */
58 jfs_flush_journal(log, 2);
59
60 /*
61 * close fileset inode allocation map (aka fileset inode)
62 */
63 diUnmount(ipimap, 0);
64
65 diFreeSpecial(ipimap);
66 sbi->ipimap = NULL;
67
68 /*
69 * close secondary aggregate inode allocation map
70 */
71 if (ipaimap2) {
72 diUnmount(ipaimap2, 0);
73 diFreeSpecial(ipaimap2);
74 sbi->ipaimap2 = NULL;
75 }
76
77 /*
78 * close aggregate inode allocation map
79 */
80 diUnmount(ipaimap, 0);
81 diFreeSpecial(ipaimap);
82 sbi->ipaimap = NULL;
83
84 /*
85 * close aggregate block allocation map
86 */
87 dbUnmount(ipbmap, 0);
88
89 diFreeSpecial(ipbmap);
90 sbi->ipbmap = NULL;
91
92 /*
93 * Make sure all metadata makes it to disk before we mark
94 * the superblock as clean
95 */
96 filemap_write_and_wait(sbi->direct_inode->i_mapping);
97
98 /*
99 * ensure all file system file pages are propagated to their
100 * home blocks on disk (and their in-memory buffer pages are
101 * invalidated) BEFORE updating file system superblock state
102 * (to signify file system is unmounted cleanly, and thus in
103 * consistent state) and log superblock active file system
104 * list (to signify skip logredo()).
105 */
106 if (log) { /* log = NULL if read-only mount */
107 updateSuper(sb, FM_CLEAN);
108
109 /*
110 * close log:
111 *
112 * remove file system from log active file system list.
113 */
114 rc = lmLogClose(sb);
115 }
116 jfs_info("UnMount JFS Complete: rc = %d", rc);
117 return rc;
118 }
119
120
jfs_umount_rw(struct super_block * sb)121 int jfs_umount_rw(struct super_block *sb)
122 {
123 struct jfs_sb_info *sbi = JFS_SBI(sb);
124 struct jfs_log *log = sbi->log;
125
126 if (!log)
127 return 0;
128
129 /*
130 * close log:
131 *
132 * remove file system from log active file system list.
133 */
134 jfs_flush_journal(log, 2);
135
136 /*
137 * Make sure all metadata makes it to disk
138 */
139 dbSync(sbi->ipbmap);
140 diSync(sbi->ipimap);
141
142 /*
143 * Note that we have to do this even if sync_blockdev() will
144 * do exactly the same a few instructions later: We can't
145 * mark the superblock clean before everything is flushed to
146 * disk.
147 */
148 filemap_write_and_wait(sbi->direct_inode->i_mapping);
149
150 updateSuper(sb, FM_CLEAN);
151
152 return lmLogClose(sb);
153 }
154