c3ea56c800
Data pages in gcdat metadata file (i.e. the secondary DAT for GC), are cleared or even moved back to the normal DAT when a shot of garbage collection was done. Buffer heads held by the palloc cache of gcdat must be cleared before these page cache manipulation. This adds nilfs_palloc_clear_cache() to ensure this. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
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* gcdat.c - NILFS shadow DAT inode for GC
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
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* and Ryusuke Konishi <ryusuke@osrg.net>.
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*
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*/
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#include <linux/buffer_head.h>
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#include "nilfs.h"
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#include "page.h"
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#include "mdt.h"
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int nilfs_init_gcdat_inode(struct the_nilfs *nilfs)
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{
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struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
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struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
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int err;
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gcdat->i_state = 0;
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gcdat->i_blocks = dat->i_blocks;
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gii->i_flags = dii->i_flags;
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gii->i_state = dii->i_state | (1 << NILFS_I_GCDAT);
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gii->i_cno = 0;
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nilfs_bmap_init_gcdat(gii->i_bmap, dii->i_bmap);
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err = nilfs_copy_dirty_pages(gcdat->i_mapping, dat->i_mapping);
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if (unlikely(err))
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return err;
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return nilfs_copy_dirty_pages(&gii->i_btnode_cache,
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&dii->i_btnode_cache);
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}
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void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
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{
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struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
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struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
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struct address_space *mapping = dat->i_mapping;
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struct address_space *gmapping = gcdat->i_mapping;
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down_write(&NILFS_MDT(dat)->mi_sem);
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dat->i_blocks = gcdat->i_blocks;
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dii->i_flags = gii->i_flags;
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dii->i_state = gii->i_state & ~(1 << NILFS_I_GCDAT);
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nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);
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nilfs_palloc_clear_cache(dat);
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nilfs_palloc_clear_cache(gcdat);
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nilfs_clear_dirty_pages(mapping);
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nilfs_copy_back_pages(mapping, gmapping);
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/* note: mdt dirty flags should be cleared by segctor. */
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nilfs_clear_dirty_pages(&dii->i_btnode_cache);
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nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache);
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up_write(&NILFS_MDT(dat)->mi_sem);
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}
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void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
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{
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struct inode *gcdat = nilfs->ns_gc_dat;
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struct nilfs_inode_info *gii = NILFS_I(gcdat);
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gcdat->i_state = I_CLEAR;
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gii->i_flags = 0;
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nilfs_palloc_clear_cache(gcdat);
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truncate_inode_pages(gcdat->i_mapping, 0);
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truncate_inode_pages(&gii->i_btnode_cache, 0);
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}
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