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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); |
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 | } |