tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
30int 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
50void 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_palloc_clear_cache(dat);
65 nilfs_palloc_clear_cache(gcdat);
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
76void 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
84 nilfs_palloc_clear_cache(gcdat);
85 truncate_inode_pages(gcdat->i_mapping, 0);
86 truncate_inode_pages(&gii->i_btnode_cache, 0);
87}