/* * 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_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; truncate_inode_pages(gcdat->i_mapping, 0); truncate_inode_pages(&gii->i_btnode_cache, 0); }