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Subject[RFC v2 06/83] Add inode get/read methods.
Date
From: Andiry Xu <jix024@cs.ucsd.edu>

These routines are incomplete and currently only support reserved inodes,
whose addresses are fixed. This is necessary for fill_super to work.
File/dir operations are left NULL.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/inode.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nova/inode.h | 3 +
2 files changed, 179 insertions(+)
create mode 100644 fs/nova/inode.c

diff --git a/fs/nova/inode.c b/fs/nova/inode.c
new file mode 100644
index 0000000..bfdc5dc
--- /dev/null
+++ b/fs/nova/inode.c
@@ -0,0 +1,176 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Inode methods (allocate/free/read/write).
+ *
+ * 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 <linux/fs.h>
+#include <linux/aio.h>
+#include <linux/highuid.h>
+#include <linux/module.h>
+#include <linux/mpage.h>
+#include <linux/backing-dev.h>
+#include <linux/types.h>
+#include <linux/ratelimit.h>
+#include "nova.h"
+#include "inode.h"
+
+unsigned int blk_type_to_shift[NOVA_BLOCK_TYPE_MAX] = {12, 21, 30};
+uint32_t blk_type_to_size[NOVA_BLOCK_TYPE_MAX] = {0x1000, 0x200000, 0x40000000};
+
+void nova_set_inode_flags(struct inode *inode, struct nova_inode *pi,
+ unsigned int flags)
+{
+ inode->i_flags &=
+ ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC);
+ if (flags & FS_SYNC_FL)
+ inode->i_flags |= S_SYNC;
+ if (flags & FS_APPEND_FL)
+ inode->i_flags |= S_APPEND;
+ if (flags & FS_IMMUTABLE_FL)
+ inode->i_flags |= S_IMMUTABLE;
+ if (flags & FS_NOATIME_FL)
+ inode->i_flags |= S_NOATIME;
+ if (flags & FS_DIRSYNC_FL)
+ inode->i_flags |= S_DIRSYNC;
+ if (!pi->i_xattr)
+ inode_has_no_xattr(inode);
+ inode->i_flags |= S_DAX;
+}
+
+/* copy persistent state to struct inode */
+static int nova_read_inode(struct super_block *sb, struct inode *inode,
+ u64 pi_addr)
+{
+ struct nova_inode_info *si = NOVA_I(inode);
+ struct nova_inode *pi, fake_pi;
+ struct nova_inode_info_header *sih = &si->header;
+ int ret = -EIO;
+ unsigned long ino;
+
+ ret = nova_get_reference(sb, pi_addr, &fake_pi,
+ (void **)&pi, sizeof(struct nova_inode));
+ if (ret) {
+ nova_dbg("%s: read pi @ 0x%llx failed\n",
+ __func__, pi_addr);
+ goto bad_inode;
+ }
+
+ inode->i_mode = sih->i_mode;
+ i_uid_write(inode, le32_to_cpu(pi->i_uid));
+ i_gid_write(inode, le32_to_cpu(pi->i_gid));
+// set_nlink(inode, le16_to_cpu(pi->i_links_count));
+ inode->i_generation = le32_to_cpu(pi->i_generation);
+ nova_set_inode_flags(inode, pi, le32_to_cpu(pi->i_flags));
+ ino = inode->i_ino;
+
+ /* check if the inode is active. */
+ if (inode->i_mode == 0 || pi->deleted == 1) {
+ /* this inode is deleted */
+ ret = -ESTALE;
+ goto bad_inode;
+ }
+
+ inode->i_blocks = sih->i_blocks;
+
+ switch (inode->i_mode & S_IFMT) {
+ case S_IFREG:
+ break;
+ case S_IFDIR:
+ break;
+ case S_IFLNK:
+ break;
+ default:
+ init_special_inode(inode, inode->i_mode,
+ le32_to_cpu(pi->dev.rdev));
+ break;
+ }
+
+ /* Update size and time after rebuild the tree */
+ inode->i_size = le64_to_cpu(sih->i_size);
+ inode->i_atime.tv_sec = (__s32)le32_to_cpu(pi->i_atime);
+ inode->i_ctime.tv_sec = (__s32)le32_to_cpu(pi->i_ctime);
+ inode->i_mtime.tv_sec = (__s32)le32_to_cpu(pi->i_mtime);
+ inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec =
+ inode->i_ctime.tv_nsec = 0;
+ set_nlink(inode, le16_to_cpu(pi->i_links_count));
+ return 0;
+
+bad_inode:
+ make_bad_inode(inode);
+ return ret;
+}
+
+/* Get the address in PMEM of an inode by inode number. Allocate additional
+ * block to store additional inodes if necessary.
+ */
+int nova_get_inode_address(struct super_block *sb, u64 ino,
+ u64 *pi_addr, int extendable)
+{
+ if (ino < NOVA_NORMAL_INODE_START) {
+ *pi_addr = nova_get_reserved_inode_addr(sb, ino);
+ return 0;
+ }
+
+ *pi_addr = 0;
+ return 0;
+}
+
+struct inode *nova_iget(struct super_block *sb, unsigned long ino)
+{
+ struct nova_inode_info *si;
+ struct inode *inode;
+ u64 pi_addr;
+ int err;
+
+ inode = iget_locked(sb, ino);
+ if (unlikely(!inode))
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ si = NOVA_I(inode);
+
+ nova_dbgv("%s: inode %lu\n", __func__, ino);
+
+ err = nova_get_inode_address(sb, ino, &pi_addr, 0);
+ if (err) {
+ nova_dbg("%s: get inode %lu address failed %d\n",
+ __func__, ino, err);
+ goto fail;
+ }
+
+ if (pi_addr == 0) {
+ nova_dbg("%s: failed to get pi_addr for inode %lu\n",
+ __func__, ino);
+ err = -EACCES;
+ goto fail;
+ }
+
+ err = nova_read_inode(sb, inode, pi_addr);
+ if (unlikely(err)) {
+ nova_dbg("%s: failed to read inode %lu\n", __func__, ino);
+ goto fail;
+
+ }
+
+ inode->i_ino = ino;
+
+ unlock_new_inode(inode);
+ return inode;
+fail:
+ iget_failed(inode);
+ return ERR_PTR(err);
+}
+
diff --git a/fs/nova/inode.h b/fs/nova/inode.h
index f9187e3..dbd5256 100644
--- a/fs/nova/inode.h
+++ b/fs/nova/inode.h
@@ -184,4 +184,7 @@ static inline int nova_persist_inode(struct nova_inode *pi)
return 0;
}

+int nova_get_inode_address(struct super_block *sb, u64 ino,
+ u64 *pi_addr, int extendable);
+struct inode *nova_iget(struct super_block *sb, unsigned long ino);
#endif
--
2.7.4
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