[linux-2.6-block.git] / fs / nilfs2 / gcdat.c

/*
 * gcdat.c - NILFS shadow DAT inode for GC
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
 *            and Ryusuke Konishi <ryusuke@osrg.net>.
 *
 */

#include <linux/buffer_head.h>
#include "nilfs.h"
#include "page.h"
#include "mdt.h"

int nilfs_init_gcdat_inode(struct the_nilfs *nilfs)
{
	struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
	struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
	int err;

	gcdat->i_state = 0;
	gcdat->i_blocks = dat->i_blocks;
	gii->i_flags = dii->i_flags;
	gii->i_state = dii->i_state | (1 << NILFS_I_GCDAT);
	gii->i_cno = 0;
	nilfs_bmap_init_gcdat(gii->i_bmap, dii->i_bmap);
	err = nilfs_copy_dirty_pages(gcdat->i_mapping, dat->i_mapping);
	if (unlikely(err))
		return err;

	return nilfs_copy_dirty_pages(&gii->i_btnode_cache,
				      &dii->i_btnode_cache);
}

void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
{
	struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
	struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
	struct address_space *mapping = dat->i_mapping;
	struct address_space *gmapping = gcdat->i_mapping;

	down_write(&NILFS_MDT(dat)->mi_sem);
	dat->i_blocks = gcdat->i_blocks;
	dii->i_flags = gii->i_flags;
	dii->i_state = gii->i_state & ~(1 << NILFS_I_GCDAT);

	nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);

	nilfs_palloc_clear_cache(dat);
	nilfs_palloc_clear_cache(gcdat);
	nilfs_clear_dirty_pages(mapping);
	nilfs_copy_back_pages(mapping, gmapping);
	/* note: mdt dirty flags should be cleared by segctor. */

	nilfs_clear_dirty_pages(&dii->i_btnode_cache);
	nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache);

	up_write(&NILFS_MDT(dat)->mi_sem);
}

void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
{
	struct inode *gcdat = nilfs->ns_gc_dat;
	struct nilfs_inode_info *gii = NILFS_I(gcdat);

	gcdat->i_state = I_CLEAR;
	gii->i_flags = 0;

	nilfs_palloc_clear_cache(gcdat);
	truncate_inode_pages(gcdat->i_mapping, 0);
	truncate_inode_pages(&gii->i_btnode_cache, 0);
}
Commit	Line	Data
84ef1ecf RK	1	/*
	2	* gcdat.c - NILFS shadow DAT inode for GC
	3	*
	4	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
	21	* and Ryusuke Konishi <ryusuke@osrg.net>.
	22	*
	23	*/
	24
	25	#include <linux/buffer_head.h>
	26	#include "nilfs.h"
	27	#include "page.h"
	28	#include "mdt.h"
	29
	30	int nilfs_init_gcdat_inode(struct the_nilfs *nilfs)
	31	{
	32	struct inode dat = nilfs->ns_dat, gcdat = nilfs->ns_gc_dat;
	33	struct nilfs_inode_info dii = NILFS_I(dat), gii = NILFS_I(gcdat);
	34	int err;
	35
	36	gcdat->i_state = 0;
	37	gcdat->i_blocks = dat->i_blocks;
	38	gii->i_flags = dii->i_flags;
	39	gii->i_state = dii->i_state \| (1 << NILFS_I_GCDAT);
	40	gii->i_cno = 0;
	41	nilfs_bmap_init_gcdat(gii->i_bmap, dii->i_bmap);
	42	err = nilfs_copy_dirty_pages(gcdat->i_mapping, dat->i_mapping);
	43	if (unlikely(err))
	44	return err;
	45
	46	return nilfs_copy_dirty_pages(&gii->i_btnode_cache,
	47	&dii->i_btnode_cache);
	48	}
	49
	50	void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
	51	{
	52	struct inode dat = nilfs->ns_dat, gcdat = nilfs->ns_gc_dat;
	53	struct nilfs_inode_info dii = NILFS_I(dat), gii = NILFS_I(gcdat);
	54	struct address_space *mapping = dat->i_mapping;
	55	struct address_space *gmapping = gcdat->i_mapping;
	56
	57	down_write(&NILFS_MDT(dat)->mi_sem);
	58	dat->i_blocks = gcdat->i_blocks;
	59	dii->i_flags = gii->i_flags;
	60	dii->i_state = gii->i_state & ~(1 << NILFS_I_GCDAT);
	61
	62	nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);
	63
c3ea56c8 RK	64	nilfs_palloc_clear_cache(dat);
c3ea56c8 RK	65	nilfs_palloc_clear_cache(gcdat);
84ef1ecf RK	66	nilfs_clear_dirty_pages(mapping);
	67	nilfs_copy_back_pages(mapping, gmapping);
	68	/* note: mdt dirty flags should be cleared by segctor. */
	69
	70	nilfs_clear_dirty_pages(&dii->i_btnode_cache);
	71	nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache);
	72
	73	up_write(&NILFS_MDT(dat)->mi_sem);
	74	}
	75
	76	void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
	77	{
	78	struct inode *gcdat = nilfs->ns_gc_dat;
	79	struct nilfs_inode_info *gii = NILFS_I(gcdat);
	80
	81	gcdat->i_state = I_CLEAR;
	82	gii->i_flags = 0;
	83
c3ea56c8	84	nilfs_palloc_clear_cache(gcdat);
84ef1ecf RK	85	truncate_inode_pages(gcdat->i_mapping, 0);
	86	truncate_inode_pages(&gii->i_btnode_cache, 0);
	87	}