[net-next-2.6.git] / fs / jfs / jfs_umount.c

/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 *	jfs_umount.c
 *
 * note: file system in transition to aggregate/fileset:
 * (ref. jfs_mount.c)
 *
 * file system unmount is interpreted as mount of the single/only
 * fileset in the aggregate and, if unmount of the last fileset,
 * as unmount of the aggerate;
 */

#include <linux/fs.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_superblock.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_debug.h"

/*
 * NAME:	jfs_umount(vfsp, flags, crp)
 *
 * FUNCTION:	vfs_umount()
 *
 * PARAMETERS:	vfsp	- virtual file system pointer
 *		flags	- unmount for shutdown
 *		crp	- credential
 *
 * RETURN :	EBUSY	- device has open files
 */
int jfs_umount(struct super_block *sb)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct inode *ipbmap = sbi->ipbmap;
	struct inode *ipimap = sbi->ipimap;
	struct inode *ipaimap = sbi->ipaimap;
	struct inode *ipaimap2 = sbi->ipaimap2;
	struct jfs_log *log;
	int rc = 0;

	jfs_info("UnMount JFS: sb:0x%p", sb);

	/*
	 *	update superblock and close log
	 *
	 * if mounted read-write and log based recovery was enabled
	 */
	if ((log = sbi->log))
		/*
		 * Wait for outstanding transactions to be written to log:
		 */
		jfs_flush_journal(log, 1);

	/*
	 * close fileset inode allocation map (aka fileset inode)
	 */
	diUnmount(ipimap, 0);

	diFreeSpecial(ipimap);
	sbi->ipimap = NULL;

	/*
	 * close secondary aggregate inode allocation map
	 */
	ipaimap2 = sbi->ipaimap2;
	if (ipaimap2) {
		diUnmount(ipaimap2, 0);
		diFreeSpecial(ipaimap2);
		sbi->ipaimap2 = NULL;
	}

	/*
	 * close aggregate inode allocation map
	 */
	ipaimap = sbi->ipaimap;
	diUnmount(ipaimap, 0);
	diFreeSpecial(ipaimap);
	sbi->ipaimap = NULL;

	/*
	 * close aggregate block allocation map
	 */
	dbUnmount(ipbmap, 0);

	diFreeSpecial(ipbmap);
	sbi->ipimap = NULL;

	/*
	 * Make sure all metadata makes it to disk before we mark
	 * the superblock as clean
	 */
	filemap_write_and_wait(sbi->direct_inode->i_mapping);

	/*
	 * ensure all file system file pages are propagated to their
	 * home blocks on disk (and their in-memory buffer pages are
	 * invalidated) BEFORE updating file system superblock state
	 * (to signify file system is unmounted cleanly, and thus in
	 * consistent state) and log superblock active file system
	 * list (to signify skip logredo()).
	 */
	if (log) {		/* log = NULL if read-only mount */
		updateSuper(sb, FM_CLEAN);

		/*
		 * close log:
		 *
		 * remove file system from log active file system list.
		 */
		rc = lmLogClose(sb);
	}
	jfs_info("UnMount JFS Complete: rc = %d", rc);
	return rc;
}


int jfs_umount_rw(struct super_block *sb)
{
	struct jfs_sb_info *sbi = JFS_SBI(sb);
	struct jfs_log *log = sbi->log;

	if (!log)
		return 0;

	/*
	 * close log:
	 *
	 * remove file system from log active file system list.
	 */
	jfs_flush_journal(log, 1);

	/*
	 * Make sure all metadata makes it to disk
	 */
	dbSync(sbi->ipbmap);
	diSync(sbi->ipimap);

	/*
	 * Note that we have to do this even if sync_blockdev() will
	 * do exactly the same a few instructions later:  We can't
	 * mark the superblock clean before everything is flushed to
	 * disk.
	 */
	filemap_write_and_wait(sbi->direct_inode->i_mapping);

	updateSuper(sb, FM_CLEAN);

	return lmLogClose(sb);
}
Commit	Line	Data
1da177e4 LT	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
63f83c9f	6	* the Free Software Foundation; either version 2 of the License, or
1da177e4	7	* (at your option) any later version.
63f83c9f	8	*
1da177e4 LT	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
63f83c9f	15	* along with this program; if not, write to the Free Software
1da177e4 LT	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	17	*/
	18
	19	/*
	20	* jfs_umount.c
	21	*
	22	* note: file system in transition to aggregate/fileset:
	23	* (ref. jfs_mount.c)
	24	*
63f83c9f DK	25	* file system unmount is interpreted as mount of the single/only
63f83c9f DK	26	* fileset in the aggregate and, if unmount of the last fileset,
1da177e4 LT	27	* as unmount of the aggerate;
	28	*/
	29
	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"
	38
	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	{
1da177e4 LT	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;
	59
	60	jfs_info("UnMount JFS: sb:0x%p", sb);
	61
	62	/*
f720e3ba	63	* update superblock and close log
1da177e4 LT	64	*
	65	* if mounted read-write and log based recovery was enabled
	66	*/
	67	if ((log = sbi->log))
	68	/*
63f83c9f	69	* Wait for outstanding transactions to be written to log:
1da177e4	70	*/
67e6682f	71	jfs_flush_journal(log, 1);
1da177e4 LT	72
	73	/*
	74	* close fileset inode allocation map (aka fileset inode)
	75	*/
	76	diUnmount(ipimap, 0);
	77
	78	diFreeSpecial(ipimap);
	79	sbi->ipimap = NULL;
	80
	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	}
	90
	91	/*
	92	* close aggregate inode allocation map
	93	*/
	94	ipaimap = sbi->ipaimap;
	95	diUnmount(ipaimap, 0);
	96	diFreeSpecial(ipaimap);
	97	sbi->ipaimap = NULL;
	98
	99	/*
	100	* close aggregate block allocation map
	101	*/
	102	dbUnmount(ipbmap, 0);
	103
	104	diFreeSpecial(ipbmap);
	105	sbi->ipimap = NULL;
	106
	107	/*
	108	* Make sure all metadata makes it to disk before we mark
	109	* the superblock as clean
	110	*/
28fd1298	111	filemap_write_and_wait(sbi->direct_inode->i_mapping);
1da177e4 LT	112
	113	/*
	114	* ensure all file system file pages are propagated to their
63f83c9f	115	* home blocks on disk (and their in-memory buffer pages are
1da177e4	116	* invalidated) BEFORE updating file system superblock state
63f83c9f DK	117	* (to signify file system is unmounted cleanly, and thus in
63f83c9f DK	118	* consistent state) and log superblock active file system
1da177e4 LT	119	* list (to signify skip logredo()).
	120	*/
	121	if (log) { /* log = NULL if read-only mount */
	122	updateSuper(sb, FM_CLEAN);
	123
1da177e4	124	/*
63f83c9f	125	* close log:
1da177e4 LT	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	}
	134
	135
	136	int jfs_umount_rw(struct super_block *sb)
	137	{
1da177e4 LT	138	struct jfs_sb_info *sbi = JFS_SBI(sb);
	139	struct jfs_log *log = sbi->log;
	140
	141	if (!log)
	142	return 0;
	143
	144	/*
63f83c9f	145	* close log:
1da177e4 LT	146	*
	147	* remove file system from log active file system list.
	148	*/
67e6682f	149	jfs_flush_journal(log, 1);
1da177e4 LT	150
	151	/*
	152	* Make sure all metadata makes it to disk
	153	*/
	154	dbSync(sbi->ipbmap);
	155	diSync(sbi->ipimap);
	156
	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	*/
28fd1298	163	filemap_write_and_wait(sbi->direct_inode->i_mapping);
1da177e4 LT	164
	165	updateSuper(sb, FM_CLEAN);
	166
1da177e4 LT	167	return lmLogClose(sb);
1da177e4 LT	168	}