xref: /kernel/linux/linux-5.10/fs/jfs/jfs_umount.c (revision 8c2ecf20) 
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 */
37int 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
123int 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}
156