1 files changed, 84 insertions, 0 deletions

diff --git a/fs/nilfs2/gcdat.c b/fs/nilfs2/gcdat.c
new file mode 100644
index 000000000000..93383c5cee90
--- /dev/null
+++ b/fs/nilfs2/gcdat.c
@@ -0,0 +1,84 @@
+/*
+ * gcdat.c - NILFS shadow DAT inode for GC
+ *
+ * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
+ *            and Ryusuke Konishi <ryusuke@osrg.net>.
+ *
+ */
+
+#include <linux/buffer_head.h>
+#include "nilfs.h"
+#include "page.h"
+#include "mdt.h"
+
+int nilfs_init_gcdat_inode(struct the_nilfs *nilfs)
+{
+        struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
+        struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
+        int err;
+
+        gcdat->i_state = 0;
+        gcdat->i_blocks = dat->i_blocks;
+        gii->i_flags = dii->i_flags;
+        gii->i_state = dii->i_state | (1 << NILFS_I_GCDAT);
+        gii->i_cno = 0;
+        nilfs_bmap_init_gcdat(gii->i_bmap, dii->i_bmap);
+        err = nilfs_copy_dirty_pages(gcdat->i_mapping, dat->i_mapping);
+        if (unlikely(err))
+                return err;
+
+        return nilfs_copy_dirty_pages(&gii->i_btnode_cache,
+                                      &dii->i_btnode_cache);
+}
+
+void nilfs_commit_gcdat_inode(struct the_nilfs *nilfs)
+{
+        struct inode *dat = nilfs->ns_dat, *gcdat = nilfs->ns_gc_dat;
+        struct nilfs_inode_info *dii = NILFS_I(dat), *gii = NILFS_I(gcdat);
+        struct address_space *mapping = dat->i_mapping;
+        struct address_space *gmapping = gcdat->i_mapping;
+
+        down_write(&NILFS_MDT(dat)->mi_sem);
+        dat->i_blocks = gcdat->i_blocks;
+        dii->i_flags = gii->i_flags;
+        dii->i_state = gii->i_state & ~(1 << NILFS_I_GCDAT);
+
+        nilfs_bmap_commit_gcdat(gii->i_bmap, dii->i_bmap);
+
+        nilfs_clear_dirty_pages(mapping);
+        nilfs_copy_back_pages(mapping, gmapping);
+        /* note: mdt dirty flags should be cleared by segctor. */
+
+        nilfs_clear_dirty_pages(&dii->i_btnode_cache);
+        nilfs_copy_back_pages(&dii->i_btnode_cache, &gii->i_btnode_cache);
+
+        up_write(&NILFS_MDT(dat)->mi_sem);
+}
+
+void nilfs_clear_gcdat_inode(struct the_nilfs *nilfs)
+{
+        struct inode *gcdat = nilfs->ns_gc_dat;
+        struct nilfs_inode_info *gii = NILFS_I(gcdat);
+
+        gcdat->i_state = I_CLEAR;
+        gii->i_flags = 0;
+
+        truncate_inode_pages(gcdat->i_mapping, 0);
+        truncate_inode_pages(&gii->i_btnode_cache, 0);
+}