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Subject[RFC v2 07/83] Initialize inode_info and rebuild inode information in nova_iget().
Date
From: Andiry Xu <jix024@cs.ucsd.edu>

Incomplete nova_rebuild_inode() implemenation.
nova_rebuild_inode() will go through the inode log and rebuild
radix tree and metadata. Leave for later patches.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/bbuild.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nova/bbuild.h | 7 +++++++
fs/nova/inode.c | 6 ++++++
fs/nova/nova.h | 10 ++++++++++
fs/nova/rebuild.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 124 insertions(+)
create mode 100644 fs/nova/bbuild.c
create mode 100644 fs/nova/bbuild.h
create mode 100644 fs/nova/rebuild.c

diff --git a/fs/nova/bbuild.c b/fs/nova/bbuild.c
new file mode 100644
index 0000000..8bc0545
--- /dev/null
+++ b/fs/nova/bbuild.c
@@ -0,0 +1,53 @@
+/*
+ * NOVA Recovery routines.
+ *
+ * Copyright 2015-2016 Regents of the University of California,
+ * UCSD Non-Volatile Systems Lab, Andiry Xu <jix024@cs.ucsd.edu>
+ * Copyright 2012-2013 Intel Corporation
+ * Copyright 2009-2011 Marco Stornelli <marco.stornelli@gmail.com>
+ * Copyright 2003 Sony Corporation
+ * Copyright 2003 Matsushita Electric Industrial Co., Ltd.
+ * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/fs.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/delay.h>
+#include "nova.h"
+#include "super.h"
+#include "inode.h"
+
+void nova_init_header(struct super_block *sb,
+ struct nova_inode_info_header *sih, u16 i_mode)
+{
+ sih->log_pages = 0;
+ sih->i_size = 0;
+ sih->ino = 0;
+ sih->i_blocks = 0;
+ sih->pi_addr = 0;
+ INIT_RADIX_TREE(&sih->tree, GFP_ATOMIC);
+ sih->i_mode = i_mode;
+ sih->i_flags = 0;
+ sih->valid_entries = 0;
+ sih->num_entries = 0;
+ sih->last_setattr = 0;
+ sih->last_link_change = 0;
+ sih->last_dentry = 0;
+ sih->trans_id = 0;
+ sih->log_head = 0;
+ sih->log_tail = 0;
+ sih->i_blk_type = NOVA_DEFAULT_BLOCK_TYPE;
+ init_rwsem(&sih->i_sem);
+}
+
diff --git a/fs/nova/bbuild.h b/fs/nova/bbuild.h
new file mode 100644
index 0000000..162a832
--- /dev/null
+++ b/fs/nova/bbuild.h
@@ -0,0 +1,7 @@
+#ifndef __BBUILD_H
+#define __BBUILD_H
+
+void nova_init_header(struct super_block *sb,
+ struct nova_inode_info_header *sih, u16 i_mode);
+
+#endif
diff --git a/fs/nova/inode.c b/fs/nova/inode.c
index bfdc5dc..f7d6410 100644
--- a/fs/nova/inode.c
+++ b/fs/nova/inode.c
@@ -158,6 +158,12 @@ struct inode *nova_iget(struct super_block *sb, unsigned long ino)
goto fail;
}

+ err = nova_rebuild_inode(sb, si, ino, pi_addr, 1);
+ if (err) {
+ nova_dbg("%s: failed to rebuild inode %lu\n", __func__, ino);
+ goto fail;
+ }
+
err = nova_read_inode(sb, inode, pi_addr);
if (unlikely(err)) {
nova_dbg("%s: failed to read inode %lu\n", __func__, ino);
diff --git a/fs/nova/nova.h b/fs/nova/nova.h
index 5eb696c..ded9fe8 100644
--- a/fs/nova/nova.h
+++ b/fs/nova/nova.h
@@ -296,4 +296,14 @@ static inline u64 nova_get_epoch_id(struct super_block *sb)
}

#include "inode.h"
+#include "bbuild.h"
+
+/* ====================================================== */
+/* ============== Function prototypes ================= */
+/* ====================================================== */
+
+/* rebuild.c */
+int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,
+ u64 ino, u64 pi_addr, int rebuild_dir);
+
#endif /* __NOVA_H */
diff --git a/fs/nova/rebuild.c b/fs/nova/rebuild.c
new file mode 100644
index 0000000..0595851
--- /dev/null
+++ b/fs/nova/rebuild.c
@@ -0,0 +1,48 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Inode rebuild methods.
+ *
+ * Copyright 2015-2016 Regents of the University of California,
+ * UCSD Non-Volatile Systems Lab, Andiry Xu <jix024@cs.ucsd.edu>
+ * Copyright 2012-2013 Intel Corporation
+ * Copyright 2009-2011 Marco Stornelli <marco.stornelli@gmail.com>
+ * Copyright 2003 Sony Corporation
+ * Copyright 2003 Matsushita Electric Industrial Co., Ltd.
+ * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include "nova.h"
+#include "inode.h"
+
+/* initialize nova inode header and other DRAM data structures */
+int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,
+ u64 ino, u64 pi_addr, int rebuild_dir)
+{
+ struct nova_inode_info_header *sih = &si->header;
+ struct nova_inode *pi;
+
+ pi = (struct nova_inode *)nova_get_block(sb, pi_addr);
+ // We need this valid in case we need to evict the inode.
+
+ nova_init_header(sb, sih, __le16_to_cpu(pi->i_mode));
+ sih->pi_addr = pi_addr;
+
+ if (pi->deleted == 1) {
+ nova_dbgv("%s: inode %llu has been deleted.\n", __func__, ino);
+ return -ESTALE;
+ }
+
+ nova_dbgv("%s: inode %llu, addr 0x%llx, valid %d, head 0x%llx, tail 0x%llx\n",
+ __func__, ino, pi_addr, pi->valid,
+ pi->log_head, pi->log_tail);
+
+ sih->ino = ino;
+
+ /* Traverse the log */
+ return 0;
+}
+
--
2.7.4
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