diff options
| -rw-r--r-- | fs/nilfs2/gcdat.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/fs/nilfs2/gcdat.c b/fs/nilfs2/gcdat.c new file mode 100644 index 000000000000..93383c5cee90 --- /dev/null +++ b/fs/nilfs2/gcdat.c @@ -0,0 +1,84 @@ +/* + * 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); +} |