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 */
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 ipaimap2 = sbi->ipaimap2;
72 if (ipaimap2) {
73 diUnmount(ipaimap2, 0);
74 diFreeSpecial(ipaimap2);
75 sbi->ipaimap2 = NULL;
76 }
77
78 /*
79 * close aggregate inode allocation map
80 */
81 ipaimap = sbi->ipaimap;
82 diUnmount(ipaimap, 0);
83 diFreeSpecial(ipaimap);
84 sbi->ipaimap = NULL;
85
86 /*
87 * close aggregate block allocation map
88 */
89 dbUnmount(ipbmap, 0);
90
91 diFreeSpecial(ipbmap);
92 sbi->ipimap = NULL;
93
94 /*
95 * Make sure all metadata makes it to disk before we mark
96 * the superblock as clean
97 */
98 filemap_write_and_wait(sbi->direct_inode->i_mapping);
99
100 /*
101 * ensure all file system file pages are propagated to their
102 * home blocks on disk (and their in-memory buffer pages are
103 * invalidated) BEFORE updating file system superblock state
104 * (to signify file system is unmounted cleanly, and thus in
105 * consistent state) and log superblock active file system
106 * list (to signify skip logredo()).
107 */
108 if (log) { /* log = NULL if read-only mount */
109 updateSuper(sb, FM_CLEAN);
110
111 /*
112 * close log:
113 *
114 * remove file system from log active file system list.
115 */
116 rc = lmLogClose(sb);
117 }
118 jfs_info("UnMount JFS Complete: rc = %d", rc);
119 return rc;
120 }
121
122
123 int jfs_umount_rw(struct super_block *sb)
124 {
125 struct jfs_sb_info *sbi = JFS_SBI(sb);
126 struct jfs_log *log = sbi->log;
127
128 if (!log)
129 return 0;
130
131 /*
132 * close log:
133 *
134 * remove file system from log active file system list.
135 */
136 jfs_flush_journal(log, 2);
137
138 /*
139 * Make sure all metadata makes it to disk
140 */
141 dbSync(sbi->ipbmap);
142 diSync(sbi->ipimap);
143
144 /*
145 * Note that we have to do this even if sync_blockdev() will
146 * do exactly the same a few instructions later: We can't
147 * mark the superblock clean before everything is flushed to
148 * disk.
149 */
150 filemap_write_and_wait(sbi->direct_inode->i_mapping);
151
152 updateSuper(sb, FM_CLEAN);
153
154 return lmLogClose(sb);
155 }