LXR linux/fs/nilfs2/gcdat.c

   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_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
  74void 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}
  85