xref: /kernel/linux/linux-6.6/fs/jfs/jfs_umount.c (revision 62306a36) 
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	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
121int 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