c3ea56c800
Data pages in gcdat metadata file (i.e. the secondary DAT for GC), are cleared or even moved back to the normal DAT when a shot of garbage collection was done. Buffer heads held by the palloc cache of gcdat must be cleared before these page cache manipulation. This adds nilfs_palloc_clear_cache() to ensure this. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
88 lines
2.8 KiB
C
88 lines
2.8 KiB
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);
|
|
}
|