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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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