projects / linux.git / blame
| 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 <[email protected]>, Amagai Yoshiji <[email protected]>, | |
| 21 | * and Ryusuke Konishi <[email protected]>. | |
| 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 | ||
| 64 | nilfs_clear_dirty_pages(mapping); | |
| 65 | nilfs_copy_back_pages(mapping, gmapping); | |
| 66 | /* note: mdt dirty flags should be cleared by segctor. */ | |
| 67 | ||
| 68 | nilfs_clear_dirty_pages(&dii->i_btnode_cache); | |
| 69 | nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache); | |
| 70 | ||
| 71 | up_write(&NILFS_MDT(dat)->mi_sem); | |
| 72 | } | |
| 73 | ||
| 74 | void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs) | |
| 75 | { | |
| 76 | struct inode *gcdat = nilfs->ns_gc_dat; | |
| 77 | struct nilfs_inode_info *gii = NILFS_I(gcdat); | |
| 78 | ||
| 79 | gcdat->i_state = I_CLEAR; | |
| 80 | gii->i_flags = 0; | |
| 81 | ||
| 82 | truncate_inode_pages(gcdat->i_mapping, 0); | |
| 83 | truncate_inode_pages(&gii->i_btnode_cache, 0); | |
| 84 | } |